Index: linux-4.14.15-rt12/Documentation/trace/events.txt =================================================================== --- linux-4.14.15-rt12.orig/Documentation/trace/events.txt +++ linux-4.14.15-rt12/Documentation/trace/events.txt @@ -517,1550 +517,4 @@ The following commands are supported: totals derived from one or more trace event format fields and/or event counts (hitcount). - The format of a hist trigger is as follows: - - hist:keys=[:values=] - [:sort=][:size=#entries][:pause][:continue] - [:clear][:name=histname1] [if ] - - When a matching event is hit, an entry is added to a hash table - using the key(s) and value(s) named. Keys and values correspond to - fields in the event's format description. Values must correspond to - numeric fields - on an event hit, the value(s) will be added to a - sum kept for that field. The special string 'hitcount' can be used - in place of an explicit value field - this is simply a count of - event hits. If 'values' isn't specified, an implicit 'hitcount' - value will be automatically created and used as the only value. - Keys can be any field, or the special string 'stacktrace', which - will use the event's kernel stacktrace as the key. The keywords - 'keys' or 'key' can be used to specify keys, and the keywords - 'values', 'vals', or 'val' can be used to specify values. Compound - keys consisting of up to two fields can be specified by the 'keys' - keyword. Hashing a compound key produces a unique entry in the - table for each unique combination of component keys, and can be - useful for providing more fine-grained summaries of event data. - Additionally, sort keys consisting of up to two fields can be - specified by the 'sort' keyword. If more than one field is - specified, the result will be a 'sort within a sort': the first key - is taken to be the primary sort key and the second the secondary - key. If a hist trigger is given a name using the 'name' parameter, - its histogram data will be shared with other triggers of the same - name, and trigger hits will update this common data. Only triggers - with 'compatible' fields can be combined in this way; triggers are - 'compatible' if the fields named in the trigger share the same - number and type of fields and those fields also have the same names. - Note that any two events always share the compatible 'hitcount' and - 'stacktrace' fields and can therefore be combined using those - fields, however pointless that may be. - - 'hist' triggers add a 'hist' file to each event's subdirectory. - Reading the 'hist' file for the event will dump the hash table in - its entirety to stdout. If there are multiple hist triggers - attached to an event, there will be a table for each trigger in the - output. The table displayed for a named trigger will be the same as - any other instance having the same name. Each printed hash table - entry is a simple list of the keys and values comprising the entry; - keys are printed first and are delineated by curly braces, and are - followed by the set of value fields for the entry. By default, - numeric fields are displayed as base-10 integers. This can be - modified by appending any of the following modifiers to the field - name: - - .hex display a number as a hex value - .sym display an address as a symbol - .sym-offset display an address as a symbol and offset - .syscall display a syscall id as a system call name - .execname display a common_pid as a program name - - Note that in general the semantics of a given field aren't - interpreted when applying a modifier to it, but there are some - restrictions to be aware of in this regard: - - - only the 'hex' modifier can be used for values (because values - are essentially sums, and the other modifiers don't make sense - in that context). - - the 'execname' modifier can only be used on a 'common_pid'. The - reason for this is that the execname is simply the 'comm' value - saved for the 'current' process when an event was triggered, - which is the same as the common_pid value saved by the event - tracing code. Trying to apply that comm value to other pid - values wouldn't be correct, and typically events that care save - pid-specific comm fields in the event itself. - - A typical usage scenario would be the following to enable a hist - trigger, read its current contents, and then turn it off: - - # echo 'hist:keys=skbaddr.hex:vals=len' > \ - /sys/kernel/debug/tracing/events/net/netif_rx/trigger - - # cat /sys/kernel/debug/tracing/events/net/netif_rx/hist - - # echo '!hist:keys=skbaddr.hex:vals=len' > \ - /sys/kernel/debug/tracing/events/net/netif_rx/trigger - - The trigger file itself can be read to show the details of the - currently attached hist trigger. This information is also displayed - at the top of the 'hist' file when read. - - By default, the size of the hash table is 2048 entries. The 'size' - parameter can be used to specify more or fewer than that. The units - are in terms of hashtable entries - if a run uses more entries than - specified, the results will show the number of 'drops', the number - of hits that were ignored. The size should be a power of 2 between - 128 and 131072 (any non- power-of-2 number specified will be rounded - up). - - The 'sort' parameter can be used to specify a value field to sort - on. The default if unspecified is 'hitcount' and the default sort - order is 'ascending'. To sort in the opposite direction, append - .descending' to the sort key. - - The 'pause' parameter can be used to pause an existing hist trigger - or to start a hist trigger but not log any events until told to do - so. 'continue' or 'cont' can be used to start or restart a paused - hist trigger. - - The 'clear' parameter will clear the contents of a running hist - trigger and leave its current paused/active state. - - Note that the 'pause', 'cont', and 'clear' parameters should be - applied using 'append' shell operator ('>>') if applied to an - existing trigger, rather than via the '>' operator, which will cause - the trigger to be removed through truncation. - -- enable_hist/disable_hist - - The enable_hist and disable_hist triggers can be used to have one - event conditionally start and stop another event's already-attached - hist trigger. Any number of enable_hist and disable_hist triggers - can be attached to a given event, allowing that event to kick off - and stop aggregations on a host of other events. - - The format is very similar to the enable/disable_event triggers: - - enable_hist::[:count] - disable_hist::[:count] - - Instead of enabling or disabling the tracing of the target event - into the trace buffer as the enable/disable_event triggers do, the - enable/disable_hist triggers enable or disable the aggregation of - the target event into a hash table. - - A typical usage scenario for the enable_hist/disable_hist triggers - would be to first set up a paused hist trigger on some event, - followed by an enable_hist/disable_hist pair that turns the hist - aggregation on and off when conditions of interest are hit: - - # echo 'hist:keys=skbaddr.hex:vals=len:pause' > \ - /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger - - # echo 'enable_hist:net:netif_receive_skb if filename==/usr/bin/wget' > \ - /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger - - # echo 'disable_hist:net:netif_receive_skb if comm==wget' > \ - /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger - - The above sets up an initially paused hist trigger which is unpaused - and starts aggregating events when a given program is executed, and - which stops aggregating when the process exits and the hist trigger - is paused again. - - The examples below provide a more concrete illustration of the - concepts and typical usage patterns discussed above. - - -6.2 'hist' trigger examples ---------------------------- - - The first set of examples creates aggregations using the kmalloc - event. The fields that can be used for the hist trigger are listed - in the kmalloc event's format file: - - # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/format - name: kmalloc - ID: 374 - format: - field:unsigned short common_type; offset:0; size:2; signed:0; - field:unsigned char common_flags; offset:2; size:1; signed:0; - field:unsigned char common_preempt_count; offset:3; size:1; signed:0; - field:int common_pid; offset:4; size:4; signed:1; - - field:unsigned long call_site; offset:8; size:8; signed:0; - field:const void * ptr; offset:16; size:8; signed:0; - field:size_t bytes_req; offset:24; size:8; signed:0; - field:size_t bytes_alloc; offset:32; size:8; signed:0; - field:gfp_t gfp_flags; offset:40; size:4; signed:0; - - We'll start by creating a hist trigger that generates a simple table - that lists the total number of bytes requested for each function in - the kernel that made one or more calls to kmalloc: - - # echo 'hist:key=call_site:val=bytes_req' > \ - /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger - - This tells the tracing system to create a 'hist' trigger using the - call_site field of the kmalloc event as the key for the table, which - just means that each unique call_site address will have an entry - created for it in the table. The 'val=bytes_req' parameter tells - the hist trigger that for each unique entry (call_site) in the - table, it should keep a running total of the number of bytes - requested by that call_site. - - We'll let it run for awhile and then dump the contents of the 'hist' - file in the kmalloc event's subdirectory (for readability, a number - of entries have been omitted): - - # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist - # trigger info: hist:keys=call_site:vals=bytes_req:sort=hitcount:size=2048 [active] - - { call_site: 18446744072106379007 } hitcount: 1 bytes_req: 176 - { call_site: 18446744071579557049 } hitcount: 1 bytes_req: 1024 - { call_site: 18446744071580608289 } hitcount: 1 bytes_req: 16384 - { call_site: 18446744071581827654 } hitcount: 1 bytes_req: 24 - { call_site: 18446744071580700980 } hitcount: 1 bytes_req: 8 - { call_site: 18446744071579359876 } hitcount: 1 bytes_req: 152 - { call_site: 18446744071580795365 } hitcount: 3 bytes_req: 144 - { call_site: 18446744071581303129 } hitcount: 3 bytes_req: 144 - { call_site: 18446744071580713234 } hitcount: 4 bytes_req: 2560 - { call_site: 18446744071580933750 } hitcount: 4 bytes_req: 736 - . - . - . - { call_site: 18446744072106047046 } hitcount: 69 bytes_req: 5576 - { call_site: 18446744071582116407 } hitcount: 73 bytes_req: 2336 - { call_site: 18446744072106054684 } hitcount: 136 bytes_req: 140504 - { call_site: 18446744072106224230 } hitcount: 136 bytes_req: 19584 - { call_site: 18446744072106078074 } hitcount: 153 bytes_req: 2448 - { call_site: 18446744072106062406 } hitcount: 153 bytes_req: 36720 - { call_site: 18446744071582507929 } hitcount: 153 bytes_req: 37088 - { call_site: 18446744072102520590 } hitcount: 273 bytes_req: 10920 - { call_site: 18446744071582143559 } hitcount: 358 bytes_req: 716 - { call_site: 18446744072106465852 } hitcount: 417 bytes_req: 56712 - { call_site: 18446744072102523378 } hitcount: 485 bytes_req: 27160 - { call_site: 18446744072099568646 } hitcount: 1676 bytes_req: 33520 - - Totals: - Hits: 4610 - Entries: 45 - Dropped: 0 - - The output displays a line for each entry, beginning with the key - specified in the trigger, followed by the value(s) also specified in - the trigger. At the beginning of the output is a line that displays - the trigger info, which can also be displayed by reading the - 'trigger' file: - - # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger - hist:keys=call_site:vals=bytes_req:sort=hitcount:size=2048 [active] - - At the end of the output are a few lines that display the overall - totals for the run. The 'Hits' field shows the total number of - times the event trigger was hit, the 'Entries' field shows the total - number of used entries in the hash table, and the 'Dropped' field - shows the number of hits that were dropped because the number of - used entries for the run exceeded the maximum number of entries - allowed for the table (normally 0, but if not a hint that you may - want to increase the size of the table using the 'size' parameter). - - Notice in the above output that there's an extra field, 'hitcount', - which wasn't specified in the trigger. Also notice that in the - trigger info output, there's a parameter, 'sort=hitcount', which - wasn't specified in the trigger either. The reason for that is that - every trigger implicitly keeps a count of the total number of hits - attributed to a given entry, called the 'hitcount'. That hitcount - information is explicitly displayed in the output, and in the - absence of a user-specified sort parameter, is used as the default - sort field. - - The value 'hitcount' can be used in place of an explicit value in - the 'values' parameter if you don't really need to have any - particular field summed and are mainly interested in hit - frequencies. - - To turn the hist trigger off, simply call up the trigger in the - command history and re-execute it with a '!' prepended: - - # echo '!hist:key=call_site:val=bytes_req' > \ - /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger - - Finally, notice that the call_site as displayed in the output above - isn't really very useful. It's an address, but normally addresses - are displayed in hex. To have a numeric field displayed as a hex - value, simply append '.hex' to the field name in the trigger: - - # echo 'hist:key=call_site.hex:val=bytes_req' > \ - /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger - - # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist - # trigger info: hist:keys=call_site.hex:vals=bytes_req:sort=hitcount:size=2048 [active] - - { call_site: ffffffffa026b291 } hitcount: 1 bytes_req: 433 - { call_site: ffffffffa07186ff } hitcount: 1 bytes_req: 176 - { call_site: ffffffff811ae721 } hitcount: 1 bytes_req: 16384 - { call_site: ffffffff811c5134 } hitcount: 1 bytes_req: 8 - { call_site: ffffffffa04a9ebb } hitcount: 1 bytes_req: 511 - { call_site: ffffffff8122e0a6 } hitcount: 1 bytes_req: 12 - { call_site: ffffffff8107da84 } hitcount: 1 bytes_req: 152 - { call_site: ffffffff812d8246 } hitcount: 1 bytes_req: 24 - { call_site: ffffffff811dc1e5 } hitcount: 3 bytes_req: 144 - { call_site: ffffffffa02515e8 } hitcount: 3 bytes_req: 648 - { call_site: ffffffff81258159 } hitcount: 3 bytes_req: 144 - { call_site: ffffffff811c80f4 } hitcount: 4 bytes_req: 544 - . - . - . - { call_site: ffffffffa06c7646 } hitcount: 106 bytes_req: 8024 - { call_site: ffffffffa06cb246 } hitcount: 132 bytes_req: 31680 - { call_site: ffffffffa06cef7a } hitcount: 132 bytes_req: 2112 - { call_site: ffffffff8137e399 } hitcount: 132 bytes_req: 23232 - { call_site: ffffffffa06c941c } hitcount: 185 bytes_req: 171360 - { call_site: ffffffffa06f2a66 } hitcount: 185 bytes_req: 26640 - { call_site: ffffffffa036a70e } hitcount: 265 bytes_req: 10600 - { call_site: ffffffff81325447 } hitcount: 292 bytes_req: 584 - { call_site: ffffffffa072da3c } hitcount: 446 bytes_req: 60656 - { call_site: ffffffffa036b1f2 } hitcount: 526 bytes_req: 29456 - { call_site: ffffffffa0099c06 } hitcount: 1780 bytes_req: 35600 - - Totals: - Hits: 4775 - Entries: 46 - Dropped: 0 - - Even that's only marginally more useful - while hex values do look - more like addresses, what users are typically more interested in - when looking at text addresses are the corresponding symbols - instead. To have an address displayed as symbolic value instead, - simply append '.sym' or '.sym-offset' to the field name in the - trigger: - - # echo 'hist:key=call_site.sym:val=bytes_req' > \ - /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger - - # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist - # trigger info: hist:keys=call_site.sym:vals=bytes_req:sort=hitcount:size=2048 [active] - - { call_site: [ffffffff810adcb9] syslog_print_all } hitcount: 1 bytes_req: 1024 - { call_site: [ffffffff8154bc62] usb_control_msg } hitcount: 1 bytes_req: 8 - { call_site: [ffffffffa00bf6fe] hidraw_send_report [hid] } hitcount: 1 bytes_req: 7 - { call_site: [ffffffff8154acbe] usb_alloc_urb } hitcount: 1 bytes_req: 192 - { call_site: [ffffffffa00bf1ca] hidraw_report_event [hid] } hitcount: 1 bytes_req: 7 - { call_site: [ffffffff811e3a25] __seq_open_private } hitcount: 1 bytes_req: 40 - { call_site: [ffffffff8109524a] alloc_fair_sched_group } hitcount: 2 bytes_req: 128 - { call_site: [ffffffff811febd5] fsnotify_alloc_group } hitcount: 2 bytes_req: 528 - { call_site: [ffffffff81440f58] __tty_buffer_request_room } hitcount: 2 bytes_req: 2624 - { call_site: [ffffffff81200ba6] inotify_new_group } hitcount: 2 bytes_req: 96 - { call_site: [ffffffffa05e19af] ieee80211_start_tx_ba_session [mac80211] } hitcount: 2 bytes_req: 464 - { call_site: [ffffffff81672406] tcp_get_metrics } hitcount: 2 bytes_req: 304 - { call_site: [ffffffff81097ec2] alloc_rt_sched_group } hitcount: 2 bytes_req: 128 - { call_site: [ffffffff81089b05] sched_create_group } hitcount: 2 bytes_req: 1424 - . - . - . - { call_site: [ffffffffa04a580c] intel_crtc_page_flip [i915] } hitcount: 1185 bytes_req: 123240 - { call_site: [ffffffffa0287592] drm_mode_page_flip_ioctl [drm] } hitcount: 1185 bytes_req: 104280 - { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state [i915] } hitcount: 1402 bytes_req: 190672 - { call_site: [ffffffff812891ca] ext4_find_extent } hitcount: 1518 bytes_req: 146208 - { call_site: [ffffffffa029070e] drm_vma_node_allow [drm] } hitcount: 1746 bytes_req: 69840 - { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 2021 bytes_req: 792312 - { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc [drm] } hitcount: 2592 bytes_req: 145152 - { call_site: [ffffffffa0489a66] intel_ring_begin [i915] } hitcount: 2629 bytes_req: 378576 - { call_site: [ffffffffa046041c] i915_gem_execbuffer2 [i915] } hitcount: 2629 bytes_req: 3783248 - { call_site: [ffffffff81325607] apparmor_file_alloc_security } hitcount: 5192 bytes_req: 10384 - { call_site: [ffffffffa00b7c06] hid_report_raw_event [hid] } hitcount: 5529 bytes_req: 110584 - { call_site: [ffffffff8131ebf7] aa_alloc_task_context } hitcount: 21943 bytes_req: 702176 - { call_site: [ffffffff8125847d] ext4_htree_store_dirent } hitcount: 55759 bytes_req: 5074265 - - Totals: - Hits: 109928 - Entries: 71 - Dropped: 0 - - Because the default sort key above is 'hitcount', the above shows a - the list of call_sites by increasing hitcount, so that at the bottom - we see the functions that made the most kmalloc calls during the - run. If instead we we wanted to see the top kmalloc callers in - terms of the number of bytes requested rather than the number of - calls, and we wanted the top caller to appear at the top, we can use - the 'sort' parameter, along with the 'descending' modifier: - - # echo 'hist:key=call_site.sym:val=bytes_req:sort=bytes_req.descending' > \ - /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger - - # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist - # trigger info: hist:keys=call_site.sym:vals=bytes_req:sort=bytes_req.descending:size=2048 [active] - - { call_site: [ffffffffa046041c] i915_gem_execbuffer2 [i915] } hitcount: 2186 bytes_req: 3397464 - { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 1790 bytes_req: 712176 - { call_site: [ffffffff8125847d] ext4_htree_store_dirent } hitcount: 8132 bytes_req: 513135 - { call_site: [ffffffff811e2a1b] seq_buf_alloc } hitcount: 106 bytes_req: 440128 - { call_site: [ffffffffa0489a66] intel_ring_begin [i915] } hitcount: 2186 bytes_req: 314784 - { call_site: [ffffffff812891ca] ext4_find_extent } hitcount: 2174 bytes_req: 208992 - { call_site: [ffffffff811ae8e1] __kmalloc } hitcount: 8 bytes_req: 131072 - { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state [i915] } hitcount: 859 bytes_req: 116824 - { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc [drm] } hitcount: 1834 bytes_req: 102704 - { call_site: [ffffffffa04a580c] intel_crtc_page_flip [i915] } hitcount: 972 bytes_req: 101088 - { call_site: [ffffffffa0287592] drm_mode_page_flip_ioctl [drm] } hitcount: 972 bytes_req: 85536 - { call_site: [ffffffffa00b7c06] hid_report_raw_event [hid] } hitcount: 3333 bytes_req: 66664 - { call_site: [ffffffff8137e559] sg_kmalloc } hitcount: 209 bytes_req: 61632 - . - . - . - { call_site: [ffffffff81095225] alloc_fair_sched_group } hitcount: 2 bytes_req: 128 - { call_site: [ffffffff81097ec2] alloc_rt_sched_group } hitcount: 2 bytes_req: 128 - { call_site: [ffffffff812d8406] copy_semundo } hitcount: 2 bytes_req: 48 - { call_site: [ffffffff81200ba6] inotify_new_group } hitcount: 1 bytes_req: 48 - { call_site: [ffffffffa027121a] drm_getmagic [drm] } hitcount: 1 bytes_req: 48 - { call_site: [ffffffff811e3a25] __seq_open_private } hitcount: 1 bytes_req: 40 - { call_site: [ffffffff811c52f4] bprm_change_interp } hitcount: 2 bytes_req: 16 - { call_site: [ffffffff8154bc62] usb_control_msg } hitcount: 1 bytes_req: 8 - { call_site: [ffffffffa00bf1ca] hidraw_report_event [hid] } hitcount: 1 bytes_req: 7 - { call_site: [ffffffffa00bf6fe] hidraw_send_report [hid] } hitcount: 1 bytes_req: 7 - - Totals: - Hits: 32133 - Entries: 81 - Dropped: 0 - - To display the offset and size information in addition to the symbol - name, just use 'sym-offset' instead: - - # echo 'hist:key=call_site.sym-offset:val=bytes_req:sort=bytes_req.descending' > \ - /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger - - # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist - # trigger info: hist:keys=call_site.sym-offset:vals=bytes_req:sort=bytes_req.descending:size=2048 [active] - - { call_site: [ffffffffa046041c] i915_gem_execbuffer2+0x6c/0x2c0 [i915] } hitcount: 4569 bytes_req: 3163720 - { call_site: [ffffffffa0489a66] intel_ring_begin+0xc6/0x1f0 [i915] } hitcount: 4569 bytes_req: 657936 - { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23+0x694/0x1020 [i915] } hitcount: 1519 bytes_req: 472936 - { call_site: [ffffffffa045e646] i915_gem_do_execbuffer.isra.23+0x516/0x1020 [i915] } hitcount: 3050 bytes_req: 211832 - { call_site: [ffffffff811e2a1b] seq_buf_alloc+0x1b/0x50 } hitcount: 34 bytes_req: 148384 - { call_site: [ffffffffa04a580c] intel_crtc_page_flip+0xbc/0x870 [i915] } hitcount: 1385 bytes_req: 144040 - { call_site: [ffffffff811ae8e1] __kmalloc+0x191/0x1b0 } hitcount: 8 bytes_req: 131072 - { call_site: [ffffffffa0287592] drm_mode_page_flip_ioctl+0x282/0x360 [drm] } hitcount: 1385 bytes_req: 121880 - { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc+0x32/0x100 [drm] } hitcount: 1848 bytes_req: 103488 - { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state+0x2c/0xa0 [i915] } hitcount: 461 bytes_req: 62696 - { call_site: [ffffffffa029070e] drm_vma_node_allow+0x2e/0xd0 [drm] } hitcount: 1541 bytes_req: 61640 - { call_site: [ffffffff815f8d7b] sk_prot_alloc+0xcb/0x1b0 } hitcount: 57 bytes_req: 57456 - . - . - . - { call_site: [ffffffff8109524a] alloc_fair_sched_group+0x5a/0x1a0 } hitcount: 2 bytes_req: 128 - { call_site: [ffffffffa027b921] drm_vm_open_locked+0x31/0xa0 [drm] } hitcount: 3 bytes_req: 96 - { call_site: [ffffffff8122e266] proc_self_follow_link+0x76/0xb0 } hitcount: 8 bytes_req: 96 - { call_site: [ffffffff81213e80] load_elf_binary+0x240/0x1650 } hitcount: 3 bytes_req: 84 - { call_site: [ffffffff8154bc62] usb_control_msg+0x42/0x110 } hitcount: 1 bytes_req: 8 - { call_site: [ffffffffa00bf6fe] hidraw_send_report+0x7e/0x1a0 [hid] } hitcount: 1 bytes_req: 7 - { call_site: [ffffffffa00bf1ca] hidraw_report_event+0x8a/0x120 [hid] } hitcount: 1 bytes_req: 7 - - Totals: - Hits: 26098 - Entries: 64 - Dropped: 0 - - We can also add multiple fields to the 'values' parameter. For - example, we might want to see the total number of bytes allocated - alongside bytes requested, and display the result sorted by bytes - allocated in a descending order: - - # echo 'hist:keys=call_site.sym:values=bytes_req,bytes_alloc:sort=bytes_alloc.descending' > \ - /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger - - # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist - # trigger info: hist:keys=call_site.sym:vals=bytes_req,bytes_alloc:sort=bytes_alloc.descending:size=2048 [active] - - { call_site: [ffffffffa046041c] i915_gem_execbuffer2 [i915] } hitcount: 7403 bytes_req: 4084360 bytes_alloc: 5958016 - { call_site: [ffffffff811e2a1b] seq_buf_alloc } hitcount: 541 bytes_req: 2213968 bytes_alloc: 2228224 - { call_site: [ffffffffa0489a66] intel_ring_begin [i915] } hitcount: 7404 bytes_req: 1066176 bytes_alloc: 1421568 - { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 1565 bytes_req: 557368 bytes_alloc: 1037760 - { call_site: [ffffffff8125847d] ext4_htree_store_dirent } hitcount: 9557 bytes_req: 595778 bytes_alloc: 695744 - { call_site: [ffffffffa045e646] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 5839 bytes_req: 430680 bytes_alloc: 470400 - { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state [i915] } hitcount: 2388 bytes_req: 324768 bytes_alloc: 458496 - { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc [drm] } hitcount: 3911 bytes_req: 219016 bytes_alloc: 250304 - { call_site: [ffffffff815f8d7b] sk_prot_alloc } hitcount: 235 bytes_req: 236880 bytes_alloc: 240640 - { call_site: [ffffffff8137e559] sg_kmalloc } hitcount: 557 bytes_req: 169024 bytes_alloc: 221760 - { call_site: [ffffffffa00b7c06] hid_report_raw_event [hid] } hitcount: 9378 bytes_req: 187548 bytes_alloc: 206312 - { call_site: [ffffffffa04a580c] intel_crtc_page_flip [i915] } hitcount: 1519 bytes_req: 157976 bytes_alloc: 194432 - . - . - . - { call_site: [ffffffff8109bd3b] sched_autogroup_create_attach } hitcount: 2 bytes_req: 144 bytes_alloc: 192 - { call_site: [ffffffff81097ee8] alloc_rt_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128 - { call_site: [ffffffff8109524a] alloc_fair_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128 - { call_site: [ffffffff81095225] alloc_fair_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128 - { call_site: [ffffffff81097ec2] alloc_rt_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128 - { call_site: [ffffffff81213e80] load_elf_binary } hitcount: 3 bytes_req: 84 bytes_alloc: 96 - { call_site: [ffffffff81079a2e] kthread_create_on_node } hitcount: 1 bytes_req: 56 bytes_alloc: 64 - { call_site: [ffffffffa00bf6fe] hidraw_send_report [hid] } hitcount: 1 bytes_req: 7 bytes_alloc: 8 - { call_site: [ffffffff8154bc62] usb_control_msg } hitcount: 1 bytes_req: 8 bytes_alloc: 8 - { call_site: [ffffffffa00bf1ca] hidraw_report_event [hid] } hitcount: 1 bytes_req: 7 bytes_alloc: 8 - - Totals: - Hits: 66598 - Entries: 65 - Dropped: 0 - - Finally, to finish off our kmalloc example, instead of simply having - the hist trigger display symbolic call_sites, we can have the hist - trigger additionally display the complete set of kernel stack traces - that led to each call_site. To do that, we simply use the special - value 'stacktrace' for the key parameter: - - # echo 'hist:keys=stacktrace:values=bytes_req,bytes_alloc:sort=bytes_alloc' > \ - /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger - - The above trigger will use the kernel stack trace in effect when an - event is triggered as the key for the hash table. This allows the - enumeration of every kernel callpath that led up to a particular - event, along with a running total of any of the event fields for - that event. Here we tally bytes requested and bytes allocated for - every callpath in the system that led up to a kmalloc (in this case - every callpath to a kmalloc for a kernel compile): - - # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist - # trigger info: hist:keys=stacktrace:vals=bytes_req,bytes_alloc:sort=bytes_alloc:size=2048 [active] - - { stacktrace: - __kmalloc_track_caller+0x10b/0x1a0 - kmemdup+0x20/0x50 - hidraw_report_event+0x8a/0x120 [hid] - hid_report_raw_event+0x3ea/0x440 [hid] - hid_input_report+0x112/0x190 [hid] - hid_irq_in+0xc2/0x260 [usbhid] - __usb_hcd_giveback_urb+0x72/0x120 - usb_giveback_urb_bh+0x9e/0xe0 - tasklet_hi_action+0xf8/0x100 - __do_softirq+0x114/0x2c0 - irq_exit+0xa5/0xb0 - do_IRQ+0x5a/0xf0 - ret_from_intr+0x0/0x30 - cpuidle_enter+0x17/0x20 - cpu_startup_entry+0x315/0x3e0 - rest_init+0x7c/0x80 - } hitcount: 3 bytes_req: 21 bytes_alloc: 24 - { stacktrace: - __kmalloc_track_caller+0x10b/0x1a0 - kmemdup+0x20/0x50 - hidraw_report_event+0x8a/0x120 [hid] - hid_report_raw_event+0x3ea/0x440 [hid] - hid_input_report+0x112/0x190 [hid] - hid_irq_in+0xc2/0x260 [usbhid] - __usb_hcd_giveback_urb+0x72/0x120 - usb_giveback_urb_bh+0x9e/0xe0 - tasklet_hi_action+0xf8/0x100 - __do_softirq+0x114/0x2c0 - irq_exit+0xa5/0xb0 - do_IRQ+0x5a/0xf0 - ret_from_intr+0x0/0x30 - } hitcount: 3 bytes_req: 21 bytes_alloc: 24 - { stacktrace: - kmem_cache_alloc_trace+0xeb/0x150 - aa_alloc_task_context+0x27/0x40 - apparmor_cred_prepare+0x1f/0x50 - security_prepare_creds+0x16/0x20 - prepare_creds+0xdf/0x1a0 - SyS_capset+0xb5/0x200 - system_call_fastpath+0x12/0x6a - } hitcount: 1 bytes_req: 32 bytes_alloc: 32 - . - . - . - { stacktrace: - __kmalloc+0x11b/0x1b0 - i915_gem_execbuffer2+0x6c/0x2c0 [i915] - drm_ioctl+0x349/0x670 [drm] - do_vfs_ioctl+0x2f0/0x4f0 - SyS_ioctl+0x81/0xa0 - system_call_fastpath+0x12/0x6a - } hitcount: 17726 bytes_req: 13944120 bytes_alloc: 19593808 - { stacktrace: - __kmalloc+0x11b/0x1b0 - load_elf_phdrs+0x76/0xa0 - load_elf_binary+0x102/0x1650 - search_binary_handler+0x97/0x1d0 - do_execveat_common.isra.34+0x551/0x6e0 - SyS_execve+0x3a/0x50 - return_from_execve+0x0/0x23 - } hitcount: 33348 bytes_req: 17152128 bytes_alloc: 20226048 - { stacktrace: - kmem_cache_alloc_trace+0xeb/0x150 - apparmor_file_alloc_security+0x27/0x40 - security_file_alloc+0x16/0x20 - get_empty_filp+0x93/0x1c0 - path_openat+0x31/0x5f0 - do_filp_open+0x3a/0x90 - do_sys_open+0x128/0x220 - SyS_open+0x1e/0x20 - system_call_fastpath+0x12/0x6a - } hitcount: 4766422 bytes_req: 9532844 bytes_alloc: 38131376 - { stacktrace: - __kmalloc+0x11b/0x1b0 - seq_buf_alloc+0x1b/0x50 - seq_read+0x2cc/0x370 - proc_reg_read+0x3d/0x80 - __vfs_read+0x28/0xe0 - vfs_read+0x86/0x140 - SyS_read+0x46/0xb0 - system_call_fastpath+0x12/0x6a - } hitcount: 19133 bytes_req: 78368768 bytes_alloc: 78368768 - - Totals: - Hits: 6085872 - Entries: 253 - Dropped: 0 - - If you key a hist trigger on common_pid, in order for example to - gather and display sorted totals for each process, you can use the - special .execname modifier to display the executable names for the - processes in the table rather than raw pids. The example below - keeps a per-process sum of total bytes read: - - # echo 'hist:key=common_pid.execname:val=count:sort=count.descending' > \ - /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger - - # cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/hist - # trigger info: hist:keys=common_pid.execname:vals=count:sort=count.descending:size=2048 [active] - - { common_pid: gnome-terminal [ 3196] } hitcount: 280 count: 1093512 - { common_pid: Xorg [ 1309] } hitcount: 525 count: 256640 - { common_pid: compiz [ 2889] } hitcount: 59 count: 254400 - { common_pid: bash [ 8710] } hitcount: 3 count: 66369 - { common_pid: dbus-daemon-lau [ 8703] } hitcount: 49 count: 47739 - { common_pid: irqbalance [ 1252] } hitcount: 27 count: 27648 - { common_pid: 01ifupdown [ 8705] } hitcount: 3 count: 17216 - { common_pid: dbus-daemon [ 772] } hitcount: 10 count: 12396 - { common_pid: Socket Thread [ 8342] } hitcount: 11 count: 11264 - { common_pid: nm-dhcp-client. [ 8701] } hitcount: 6 count: 7424 - { common_pid: gmain [ 1315] } hitcount: 18 count: 6336 - . - . - . - { common_pid: postgres [ 1892] } hitcount: 2 count: 32 - { common_pid: postgres [ 1891] } hitcount: 2 count: 32 - { common_pid: gmain [ 8704] } hitcount: 2 count: 32 - { common_pid: upstart-dbus-br [ 2740] } hitcount: 21 count: 21 - { common_pid: nm-dispatcher.a [ 8696] } hitcount: 1 count: 16 - { common_pid: indicator-datet [ 2904] } hitcount: 1 count: 16 - { common_pid: gdbus [ 2998] } hitcount: 1 count: 16 - { common_pid: rtkit-daemon [ 2052] } hitcount: 1 count: 8 - { common_pid: init [ 1] } hitcount: 2 count: 2 - - Totals: - Hits: 2116 - Entries: 51 - Dropped: 0 - - Similarly, if you key a hist trigger on syscall id, for example to - gather and display a list of systemwide syscall hits, you can use - the special .syscall modifier to display the syscall names rather - than raw ids. The example below keeps a running total of syscall - counts for the system during the run: - - # echo 'hist:key=id.syscall:val=hitcount' > \ - /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger - - # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist - # trigger info: hist:keys=id.syscall:vals=hitcount:sort=hitcount:size=2048 [active] - - { id: sys_fsync [ 74] } hitcount: 1 - { id: sys_newuname [ 63] } hitcount: 1 - { id: sys_prctl [157] } hitcount: 1 - { id: sys_statfs [137] } hitcount: 1 - { id: sys_symlink [ 88] } hitcount: 1 - { id: sys_sendmmsg [307] } hitcount: 1 - { id: sys_semctl [ 66] } hitcount: 1 - { id: sys_readlink [ 89] } hitcount: 3 - { id: sys_bind [ 49] } hitcount: 3 - { id: sys_getsockname [ 51] } hitcount: 3 - { id: sys_unlink [ 87] } hitcount: 3 - { id: sys_rename [ 82] } hitcount: 4 - { id: unknown_syscall [ 58] } hitcount: 4 - { id: sys_connect [ 42] } hitcount: 4 - { id: sys_getpid [ 39] } hitcount: 4 - . - . - . - { id: sys_rt_sigprocmask [ 14] } hitcount: 952 - { id: sys_futex [202] } hitcount: 1534 - { id: sys_write [ 1] } hitcount: 2689 - { id: sys_setitimer [ 38] } hitcount: 2797 - { id: sys_read [ 0] } hitcount: 3202 - { id: sys_select [ 23] } hitcount: 3773 - { id: sys_writev [ 20] } hitcount: 4531 - { id: sys_poll [ 7] } hitcount: 8314 - { id: sys_recvmsg [ 47] } hitcount: 13738 - { id: sys_ioctl [ 16] } hitcount: 21843 - - Totals: - Hits: 67612 - Entries: 72 - Dropped: 0 - - The syscall counts above provide a rough overall picture of system - call activity on the system; we can see for example that the most - popular system call on this system was the 'sys_ioctl' system call. - - We can use 'compound' keys to refine that number and provide some - further insight as to which processes exactly contribute to the - overall ioctl count. - - The command below keeps a hitcount for every unique combination of - system call id and pid - the end result is essentially a table - that keeps a per-pid sum of system call hits. The results are - sorted using the system call id as the primary key, and the - hitcount sum as the secondary key: - - # echo 'hist:key=id.syscall,common_pid.execname:val=hitcount:sort=id,hitcount' > \ - /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger - - # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist - # trigger info: hist:keys=id.syscall,common_pid.execname:vals=hitcount:sort=id.syscall,hitcount:size=2048 [active] - - { id: sys_read [ 0], common_pid: rtkit-daemon [ 1877] } hitcount: 1 - { id: sys_read [ 0], common_pid: gdbus [ 2976] } hitcount: 1 - { id: sys_read [ 0], common_pid: console-kit-dae [ 3400] } hitcount: 1 - { id: sys_read [ 0], common_pid: postgres [ 1865] } hitcount: 1 - { id: sys_read [ 0], common_pid: deja-dup-monito [ 3543] } hitcount: 2 - { id: sys_read [ 0], common_pid: NetworkManager [ 890] } hitcount: 2 - { id: sys_read [ 0], common_pid: evolution-calen [ 3048] } hitcount: 2 - { id: sys_read [ 0], common_pid: postgres [ 1864] } hitcount: 2 - { id: sys_read [ 0], common_pid: nm-applet [ 3022] } hitcount: 2 - { id: sys_read [ 0], common_pid: whoopsie [ 1212] } hitcount: 2 - . - . - . - { id: sys_ioctl [ 16], common_pid: bash [ 8479] } hitcount: 1 - { id: sys_ioctl [ 16], common_pid: bash [ 3472] } hitcount: 12 - { id: sys_ioctl [ 16], common_pid: gnome-terminal [ 3199] } hitcount: 16 - { id: sys_ioctl [ 16], common_pid: Xorg [ 1267] } hitcount: 1808 - { id: sys_ioctl [ 16], common_pid: compiz [ 2994] } hitcount: 5580 - . - . - . - { id: sys_waitid [247], common_pid: upstart-dbus-br [ 2690] } hitcount: 3 - { id: sys_waitid [247], common_pid: upstart-dbus-br [ 2688] } hitcount: 16 - { id: sys_inotify_add_watch [254], common_pid: gmain [ 975] } hitcount: 2 - { id: sys_inotify_add_watch [254], common_pid: gmain [ 3204] } hitcount: 4 - { id: sys_inotify_add_watch [254], common_pid: gmain [ 2888] } hitcount: 4 - { id: sys_inotify_add_watch [254], common_pid: gmain [ 3003] } hitcount: 4 - { id: sys_inotify_add_watch [254], common_pid: gmain [ 2873] } hitcount: 4 - { id: sys_inotify_add_watch [254], common_pid: gmain [ 3196] } hitcount: 6 - { id: sys_openat [257], common_pid: java [ 2623] } hitcount: 2 - { id: sys_eventfd2 [290], common_pid: ibus-ui-gtk3 [ 2760] } hitcount: 4 - { id: sys_eventfd2 [290], common_pid: compiz [ 2994] } hitcount: 6 - - Totals: - Hits: 31536 - Entries: 323 - Dropped: 0 - - The above list does give us a breakdown of the ioctl syscall by - pid, but it also gives us quite a bit more than that, which we - don't really care about at the moment. Since we know the syscall - id for sys_ioctl (16, displayed next to the sys_ioctl name), we - can use that to filter out all the other syscalls: - - # echo 'hist:key=id.syscall,common_pid.execname:val=hitcount:sort=id,hitcount if id == 16' > \ - /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger - - # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist - # trigger info: hist:keys=id.syscall,common_pid.execname:vals=hitcount:sort=id.syscall,hitcount:size=2048 if id == 16 [active] - - { id: sys_ioctl [ 16], common_pid: gmain [ 2769] } hitcount: 1 - { id: sys_ioctl [ 16], common_pid: evolution-addre [ 8571] } hitcount: 1 - { id: sys_ioctl [ 16], common_pid: gmain [ 3003] } hitcount: 1 - { id: sys_ioctl [ 16], common_pid: gmain [ 2781] } hitcount: 1 - { id: sys_ioctl [ 16], common_pid: gmain [ 2829] } hitcount: 1 - { id: sys_ioctl [ 16], common_pid: bash [ 8726] } hitcount: 1 - { id: sys_ioctl [ 16], common_pid: bash [ 8508] } hitcount: 1 - { id: sys_ioctl [ 16], common_pid: gmain [ 2970] } hitcount: 1 - { id: sys_ioctl [ 16], common_pid: gmain [ 2768] } hitcount: 1 - . - . - . - { id: sys_ioctl [ 16], common_pid: pool [ 8559] } hitcount: 45 - { id: sys_ioctl [ 16], common_pid: pool [ 8555] } hitcount: 48 - { id: sys_ioctl [ 16], common_pid: pool [ 8551] } hitcount: 48 - { id: sys_ioctl [ 16], common_pid: avahi-daemon [ 896] } hitcount: 66 - { id: sys_ioctl [ 16], common_pid: Xorg [ 1267] } hitcount: 26674 - { id: sys_ioctl [ 16], common_pid: compiz [ 2994] } hitcount: 73443 - - Totals: - Hits: 101162 - Entries: 103 - Dropped: 0 - - The above output shows that 'compiz' and 'Xorg' are far and away - the heaviest ioctl callers (which might lead to questions about - whether they really need to be making all those calls and to - possible avenues for further investigation.) - - The compound key examples used a key and a sum value (hitcount) to - sort the output, but we can just as easily use two keys instead. - Here's an example where we use a compound key composed of the the - common_pid and size event fields. Sorting with pid as the primary - key and 'size' as the secondary key allows us to display an - ordered summary of the recvfrom sizes, with counts, received by - each process: - - # echo 'hist:key=common_pid.execname,size:val=hitcount:sort=common_pid,size' > \ - /sys/kernel/debug/tracing/events/syscalls/sys_enter_recvfrom/trigger - - # cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_recvfrom/hist - # trigger info: hist:keys=common_pid.execname,size:vals=hitcount:sort=common_pid.execname,size:size=2048 [active] - - { common_pid: smbd [ 784], size: 4 } hitcount: 1 - { common_pid: dnsmasq [ 1412], size: 4096 } hitcount: 672 - { common_pid: postgres [ 1796], size: 1000 } hitcount: 6 - { common_pid: postgres [ 1867], size: 1000 } hitcount: 10 - { common_pid: bamfdaemon [ 2787], size: 28 } hitcount: 2 - { common_pid: bamfdaemon [ 2787], size: 14360 } hitcount: 1 - { common_pid: compiz [ 2994], size: 8 } hitcount: 1 - { common_pid: compiz [ 2994], size: 20 } hitcount: 11 - { common_pid: gnome-terminal [ 3199], size: 4 } hitcount: 2 - { common_pid: firefox [ 8817], size: 4 } hitcount: 1 - { common_pid: firefox [ 8817], size: 8 } hitcount: 5 - { common_pid: firefox [ 8817], size: 588 } hitcount: 2 - { common_pid: firefox [ 8817], size: 628 } hitcount: 1 - { common_pid: firefox [ 8817], size: 6944 } hitcount: 1 - { common_pid: firefox [ 8817], size: 408880 } hitcount: 2 - { common_pid: firefox [ 8822], size: 8 } hitcount: 2 - { common_pid: firefox [ 8822], size: 160 } hitcount: 2 - { common_pid: firefox [ 8822], size: 320 } hitcount: 2 - { common_pid: firefox [ 8822], size: 352 } hitcount: 1 - . - . - . - { common_pid: pool [ 8923], size: 1960 } hitcount: 10 - { common_pid: pool [ 8923], size: 2048 } hitcount: 10 - { common_pid: pool [ 8924], size: 1960 } hitcount: 10 - { common_pid: pool [ 8924], size: 2048 } hitcount: 10 - { common_pid: pool [ 8928], size: 1964 } hitcount: 4 - { common_pid: pool [ 8928], size: 1965 } hitcount: 2 - { common_pid: pool [ 8928], size: 2048 } hitcount: 6 - { common_pid: pool [ 8929], size: 1982 } hitcount: 1 - { common_pid: pool [ 8929], size: 2048 } hitcount: 1 - - Totals: - Hits: 2016 - Entries: 224 - Dropped: 0 - - The above example also illustrates the fact that although a compound - key is treated as a single entity for hashing purposes, the sub-keys - it's composed of can be accessed independently. - - The next example uses a string field as the hash key and - demonstrates how you can manually pause and continue a hist trigger. - In this example, we'll aggregate fork counts and don't expect a - large number of entries in the hash table, so we'll drop it to a - much smaller number, say 256: - - # echo 'hist:key=child_comm:val=hitcount:size=256' > \ - /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger - - # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist - # trigger info: hist:keys=child_comm:vals=hitcount:sort=hitcount:size=256 [active] - - { child_comm: dconf worker } hitcount: 1 - { child_comm: ibus-daemon } hitcount: 1 - { child_comm: whoopsie } hitcount: 1 - { child_comm: smbd } hitcount: 1 - { child_comm: gdbus } hitcount: 1 - { child_comm: kthreadd } hitcount: 1 - { child_comm: dconf worker } hitcount: 1 - { child_comm: evolution-alarm } hitcount: 2 - { child_comm: Socket Thread } hitcount: 2 - { child_comm: postgres } hitcount: 2 - { child_comm: bash } hitcount: 3 - { child_comm: compiz } hitcount: 3 - { child_comm: evolution-sourc } hitcount: 4 - { child_comm: dhclient } hitcount: 4 - { child_comm: pool } hitcount: 5 - { child_comm: nm-dispatcher.a } hitcount: 8 - { child_comm: firefox } hitcount: 8 - { child_comm: dbus-daemon } hitcount: 8 - { child_comm: glib-pacrunner } hitcount: 10 - { child_comm: evolution } hitcount: 23 - - Totals: - Hits: 89 - Entries: 20 - Dropped: 0 - - If we want to pause the hist trigger, we can simply append :pause to - the command that started the trigger. Notice that the trigger info - displays as [paused]: - - # echo 'hist:key=child_comm:val=hitcount:size=256:pause' >> \ - /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger - - # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist - # trigger info: hist:keys=child_comm:vals=hitcount:sort=hitcount:size=256 [paused] - - { child_comm: dconf worker } hitcount: 1 - { child_comm: kthreadd } hitcount: 1 - { child_comm: dconf worker } hitcount: 1 - { child_comm: gdbus } hitcount: 1 - { child_comm: ibus-daemon } hitcount: 1 - { child_comm: Socket Thread } hitcount: 2 - { child_comm: evolution-alarm } hitcount: 2 - { child_comm: smbd } hitcount: 2 - { child_comm: bash } hitcount: 3 - { child_comm: whoopsie } hitcount: 3 - { child_comm: compiz } hitcount: 3 - { child_comm: evolution-sourc } hitcount: 4 - { child_comm: pool } hitcount: 5 - { child_comm: postgres } hitcount: 6 - { child_comm: firefox } hitcount: 8 - { child_comm: dhclient } hitcount: 10 - { child_comm: emacs } hitcount: 12 - { child_comm: dbus-daemon } hitcount: 20 - { child_comm: nm-dispatcher.a } hitcount: 20 - { child_comm: evolution } hitcount: 35 - { child_comm: glib-pacrunner } hitcount: 59 - - Totals: - Hits: 199 - Entries: 21 - Dropped: 0 - - To manually continue having the trigger aggregate events, append - :cont instead. Notice that the trigger info displays as [active] - again, and the data has changed: - - # echo 'hist:key=child_comm:val=hitcount:size=256:cont' >> \ - /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger - - # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist - # trigger info: hist:keys=child_comm:vals=hitcount:sort=hitcount:size=256 [active] - - { child_comm: dconf worker } hitcount: 1 - { child_comm: dconf worker } hitcount: 1 - { child_comm: kthreadd } hitcount: 1 - { child_comm: gdbus } hitcount: 1 - { child_comm: ibus-daemon } hitcount: 1 - { child_comm: Socket Thread } hitcount: 2 - { child_comm: evolution-alarm } hitcount: 2 - { child_comm: smbd } hitcount: 2 - { child_comm: whoopsie } hitcount: 3 - { child_comm: compiz } hitcount: 3 - { child_comm: evolution-sourc } hitcount: 4 - { child_comm: bash } hitcount: 5 - { child_comm: pool } hitcount: 5 - { child_comm: postgres } hitcount: 6 - { child_comm: firefox } hitcount: 8 - { child_comm: dhclient } hitcount: 11 - { child_comm: emacs } hitcount: 12 - { child_comm: dbus-daemon } hitcount: 22 - { child_comm: nm-dispatcher.a } hitcount: 22 - { child_comm: evolution } hitcount: 35 - { child_comm: glib-pacrunner } hitcount: 59 - - Totals: - Hits: 206 - Entries: 21 - Dropped: 0 - - The previous example showed how to start and stop a hist trigger by - appending 'pause' and 'continue' to the hist trigger command. A - hist trigger can also be started in a paused state by initially - starting the trigger with ':pause' appended. This allows you to - start the trigger only when you're ready to start collecting data - and not before. For example, you could start the trigger in a - paused state, then unpause it and do something you want to measure, - then pause the trigger again when done. - - Of course, doing this manually can be difficult and error-prone, but - it is possible to automatically start and stop a hist trigger based - on some condition, via the enable_hist and disable_hist triggers. - - For example, suppose we wanted to take a look at the relative - weights in terms of skb length for each callpath that leads to a - netif_receieve_skb event when downloading a decent-sized file using - wget. - - First we set up an initially paused stacktrace trigger on the - netif_receive_skb event: - - # echo 'hist:key=stacktrace:vals=len:pause' > \ - /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger - - Next, we set up an 'enable_hist' trigger on the sched_process_exec - event, with an 'if filename==/usr/bin/wget' filter. The effect of - this new trigger is that it will 'unpause' the hist trigger we just - set up on netif_receive_skb if and only if it sees a - sched_process_exec event with a filename of '/usr/bin/wget'. When - that happens, all netif_receive_skb events are aggregated into a - hash table keyed on stacktrace: - - # echo 'enable_hist:net:netif_receive_skb if filename==/usr/bin/wget' > \ - /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger - - The aggregation continues until the netif_receive_skb is paused - again, which is what the following disable_hist event does by - creating a similar setup on the sched_process_exit event, using the - filter 'comm==wget': - - # echo 'disable_hist:net:netif_receive_skb if comm==wget' > \ - /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger - - Whenever a process exits and the comm field of the disable_hist - trigger filter matches 'comm==wget', the netif_receive_skb hist - trigger is disabled. - - The overall effect is that netif_receive_skb events are aggregated - into the hash table for only the duration of the wget. Executing a - wget command and then listing the 'hist' file will display the - output generated by the wget command: - - $ wget https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.19.xz - - # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist - # trigger info: hist:keys=stacktrace:vals=len:sort=hitcount:size=2048 [paused] - - { stacktrace: - __netif_receive_skb_core+0x46d/0x990 - __netif_receive_skb+0x18/0x60 - netif_receive_skb_internal+0x23/0x90 - napi_gro_receive+0xc8/0x100 - ieee80211_deliver_skb+0xd6/0x270 [mac80211] - ieee80211_rx_handlers+0xccf/0x22f0 [mac80211] - ieee80211_prepare_and_rx_handle+0x4e7/0xc40 [mac80211] - ieee80211_rx+0x31d/0x900 [mac80211] - iwlagn_rx_reply_rx+0x3db/0x6f0 [iwldvm] - iwl_rx_dispatch+0x8e/0xf0 [iwldvm] - iwl_pcie_irq_handler+0xe3c/0x12f0 [iwlwifi] - irq_thread_fn+0x20/0x50 - irq_thread+0x11f/0x150 - kthread+0xd2/0xf0 - ret_from_fork+0x42/0x70 - } hitcount: 85 len: 28884 - { stacktrace: - __netif_receive_skb_core+0x46d/0x990 - __netif_receive_skb+0x18/0x60 - netif_receive_skb_internal+0x23/0x90 - napi_gro_complete+0xa4/0xe0 - dev_gro_receive+0x23a/0x360 - napi_gro_receive+0x30/0x100 - ieee80211_deliver_skb+0xd6/0x270 [mac80211] - ieee80211_rx_handlers+0xccf/0x22f0 [mac80211] - ieee80211_prepare_and_rx_handle+0x4e7/0xc40 [mac80211] - ieee80211_rx+0x31d/0x900 [mac80211] - iwlagn_rx_reply_rx+0x3db/0x6f0 [iwldvm] - iwl_rx_dispatch+0x8e/0xf0 [iwldvm] - iwl_pcie_irq_handler+0xe3c/0x12f0 [iwlwifi] - irq_thread_fn+0x20/0x50 - irq_thread+0x11f/0x150 - kthread+0xd2/0xf0 - } hitcount: 98 len: 664329 - { stacktrace: - __netif_receive_skb_core+0x46d/0x990 - __netif_receive_skb+0x18/0x60 - process_backlog+0xa8/0x150 - net_rx_action+0x15d/0x340 - __do_softirq+0x114/0x2c0 - do_softirq_own_stack+0x1c/0x30 - do_softirq+0x65/0x70 - __local_bh_enable_ip+0xb5/0xc0 - ip_finish_output+0x1f4/0x840 - ip_output+0x6b/0xc0 - ip_local_out_sk+0x31/0x40 - ip_send_skb+0x1a/0x50 - udp_send_skb+0x173/0x2a0 - udp_sendmsg+0x2bf/0x9f0 - inet_sendmsg+0x64/0xa0 - sock_sendmsg+0x3d/0x50 - } hitcount: 115 len: 13030 - { stacktrace: - __netif_receive_skb_core+0x46d/0x990 - __netif_receive_skb+0x18/0x60 - netif_receive_skb_internal+0x23/0x90 - napi_gro_complete+0xa4/0xe0 - napi_gro_flush+0x6d/0x90 - iwl_pcie_irq_handler+0x92a/0x12f0 [iwlwifi] - irq_thread_fn+0x20/0x50 - irq_thread+0x11f/0x150 - kthread+0xd2/0xf0 - ret_from_fork+0x42/0x70 - } hitcount: 934 len: 5512212 - - Totals: - Hits: 1232 - Entries: 4 - Dropped: 0 - - The above shows all the netif_receive_skb callpaths and their total - lengths for the duration of the wget command. - - The 'clear' hist trigger param can be used to clear the hash table. - Suppose we wanted to try another run of the previous example but - this time also wanted to see the complete list of events that went - into the histogram. In order to avoid having to set everything up - again, we can just clear the histogram first: - - # echo 'hist:key=stacktrace:vals=len:clear' >> \ - /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger - - Just to verify that it is in fact cleared, here's what we now see in - the hist file: - - # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist - # trigger info: hist:keys=stacktrace:vals=len:sort=hitcount:size=2048 [paused] - - Totals: - Hits: 0 - Entries: 0 - Dropped: 0 - - Since we want to see the detailed list of every netif_receive_skb - event occurring during the new run, which are in fact the same - events being aggregated into the hash table, we add some additional - 'enable_event' events to the triggering sched_process_exec and - sched_process_exit events as such: - - # echo 'enable_event:net:netif_receive_skb if filename==/usr/bin/wget' > \ - /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger - - # echo 'disable_event:net:netif_receive_skb if comm==wget' > \ - /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger - - If you read the trigger files for the sched_process_exec and - sched_process_exit triggers, you should see two triggers for each: - one enabling/disabling the hist aggregation and the other - enabling/disabling the logging of events: - - # cat /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger - enable_event:net:netif_receive_skb:unlimited if filename==/usr/bin/wget - enable_hist:net:netif_receive_skb:unlimited if filename==/usr/bin/wget - - # cat /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger - enable_event:net:netif_receive_skb:unlimited if comm==wget - disable_hist:net:netif_receive_skb:unlimited if comm==wget - - In other words, whenever either of the sched_process_exec or - sched_process_exit events is hit and matches 'wget', it enables or - disables both the histogram and the event log, and what you end up - with is a hash table and set of events just covering the specified - duration. Run the wget command again: - - $ wget https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.19.xz - - Displaying the 'hist' file should show something similar to what you - saw in the last run, but this time you should also see the - individual events in the trace file: - - # cat /sys/kernel/debug/tracing/trace - - # tracer: nop - # - # entries-in-buffer/entries-written: 183/1426 #P:4 - # - # _-----=> irqs-off - # / _----=> need-resched - # | / _---=> hardirq/softirq - # || / _--=> preempt-depth - # ||| / delay - # TASK-PID CPU# |||| TIMESTAMP FUNCTION - # | | | |||| | | - wget-15108 [000] ..s1 31769.606929: netif_receive_skb: dev=lo skbaddr=ffff88009c353100 len=60 - wget-15108 [000] ..s1 31769.606999: netif_receive_skb: dev=lo skbaddr=ffff88009c353200 len=60 - dnsmasq-1382 [000] ..s1 31769.677652: netif_receive_skb: dev=lo skbaddr=ffff88009c352b00 len=130 - dnsmasq-1382 [000] ..s1 31769.685917: netif_receive_skb: dev=lo skbaddr=ffff88009c352200 len=138 - ##### CPU 2 buffer started #### - irq/29-iwlwifi-559 [002] ..s. 31772.031529: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d433d00 len=2948 - irq/29-iwlwifi-559 [002] ..s. 31772.031572: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d432200 len=1500 - irq/29-iwlwifi-559 [002] ..s. 31772.032196: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d433100 len=2948 - irq/29-iwlwifi-559 [002] ..s. 31772.032761: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d433000 len=2948 - irq/29-iwlwifi-559 [002] ..s. 31772.033220: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d432e00 len=1500 - . - . - . - - The following example demonstrates how multiple hist triggers can be - attached to a given event. This capability can be useful for - creating a set of different summaries derived from the same set of - events, or for comparing the effects of different filters, among - other things. - - # echo 'hist:keys=skbaddr.hex:vals=len if len < 0' >> \ - /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger - # echo 'hist:keys=skbaddr.hex:vals=len if len > 4096' >> \ - /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger - # echo 'hist:keys=skbaddr.hex:vals=len if len == 256' >> \ - /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger - # echo 'hist:keys=skbaddr.hex:vals=len' >> \ - /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger - # echo 'hist:keys=len:vals=common_preempt_count' >> \ - /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger - - The above set of commands create four triggers differing only in - their filters, along with a completely different though fairly - nonsensical trigger. Note that in order to append multiple hist - triggers to the same file, you should use the '>>' operator to - append them ('>' will also add the new hist trigger, but will remove - any existing hist triggers beforehand). - - Displaying the contents of the 'hist' file for the event shows the - contents of all five histograms: - - # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist - - # event histogram - # - # trigger info: hist:keys=len:vals=hitcount,common_preempt_count:sort=hitcount:size=2048 [active] - # - - { len: 176 } hitcount: 1 common_preempt_count: 0 - { len: 223 } hitcount: 1 common_preempt_count: 0 - { len: 4854 } hitcount: 1 common_preempt_count: 0 - { len: 395 } hitcount: 1 common_preempt_count: 0 - { len: 177 } hitcount: 1 common_preempt_count: 0 - { len: 446 } hitcount: 1 common_preempt_count: 0 - { len: 1601 } hitcount: 1 common_preempt_count: 0 - . - . - . - { len: 1280 } hitcount: 66 common_preempt_count: 0 - { len: 116 } hitcount: 81 common_preempt_count: 40 - { len: 708 } hitcount: 112 common_preempt_count: 0 - { len: 46 } hitcount: 221 common_preempt_count: 0 - { len: 1264 } hitcount: 458 common_preempt_count: 0 - - Totals: - Hits: 1428 - Entries: 147 - Dropped: 0 - - - # event histogram - # - # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active] - # - - { skbaddr: ffff8800baee5e00 } hitcount: 1 len: 130 - { skbaddr: ffff88005f3d5600 } hitcount: 1 len: 1280 - { skbaddr: ffff88005f3d4900 } hitcount: 1 len: 1280 - { skbaddr: ffff88009fed6300 } hitcount: 1 len: 115 - { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 115 - { skbaddr: ffff88008cdb1900 } hitcount: 1 len: 46 - { skbaddr: ffff880064b5ef00 } hitcount: 1 len: 118 - { skbaddr: ffff880044e3c700 } hitcount: 1 len: 60 - { skbaddr: ffff880100065900 } hitcount: 1 len: 46 - { skbaddr: ffff8800d46bd500 } hitcount: 1 len: 116 - { skbaddr: ffff88005f3d5f00 } hitcount: 1 len: 1280 - { skbaddr: ffff880100064700 } hitcount: 1 len: 365 - { skbaddr: ffff8800badb6f00 } hitcount: 1 len: 60 - . - . - . - { skbaddr: ffff88009fe0be00 } hitcount: 27 len: 24677 - { skbaddr: ffff88009fe0a400 } hitcount: 27 len: 23052 - { skbaddr: ffff88009fe0b700 } hitcount: 31 len: 25589 - { skbaddr: ffff88009fe0b600 } hitcount: 32 len: 27326 - { skbaddr: ffff88006a462800 } hitcount: 68 len: 71678 - { skbaddr: ffff88006a463700 } hitcount: 70 len: 72678 - { skbaddr: ffff88006a462b00 } hitcount: 71 len: 77589 - { skbaddr: ffff88006a463600 } hitcount: 73 len: 71307 - { skbaddr: ffff88006a462200 } hitcount: 81 len: 81032 - - Totals: - Hits: 1451 - Entries: 318 - Dropped: 0 - - - # event histogram - # - # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 if len == 256 [active] - # - - - Totals: - Hits: 0 - Entries: 0 - Dropped: 0 - - - # event histogram - # - # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 if len > 4096 [active] - # - - { skbaddr: ffff88009fd2c300 } hitcount: 1 len: 7212 - { skbaddr: ffff8800d2bcce00 } hitcount: 1 len: 7212 - { skbaddr: ffff8800d2bcd700 } hitcount: 1 len: 7212 - { skbaddr: ffff8800d2bcda00 } hitcount: 1 len: 21492 - { skbaddr: ffff8800ae2e2d00 } hitcount: 1 len: 7212 - { skbaddr: ffff8800d2bcdb00 } hitcount: 1 len: 7212 - { skbaddr: ffff88006a4df500 } hitcount: 1 len: 4854 - { skbaddr: ffff88008ce47b00 } hitcount: 1 len: 18636 - { skbaddr: ffff8800ae2e2200 } hitcount: 1 len: 12924 - { skbaddr: ffff88005f3e1000 } hitcount: 1 len: 4356 - { skbaddr: ffff8800d2bcdc00 } hitcount: 2 len: 24420 - { skbaddr: ffff8800d2bcc200 } hitcount: 2 len: 12996 - - Totals: - Hits: 14 - Entries: 12 - Dropped: 0 - - - # event histogram - # - # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 if len < 0 [active] - # - - - Totals: - Hits: 0 - Entries: 0 - Dropped: 0 - - Named triggers can be used to have triggers share a common set of - histogram data. This capability is mostly useful for combining the - output of events generated by tracepoints contained inside inline - functions, but names can be used in a hist trigger on any event. - For example, these two triggers when hit will update the same 'len' - field in the shared 'foo' histogram data: - - # echo 'hist:name=foo:keys=skbaddr.hex:vals=len' > \ - /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger - # echo 'hist:name=foo:keys=skbaddr.hex:vals=len' > \ - /sys/kernel/debug/tracing/events/net/netif_rx/trigger - - You can see that they're updating common histogram data by reading - each event's hist files at the same time: - - # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist; - cat /sys/kernel/debug/tracing/events/net/netif_rx/hist - - # event histogram - # - # trigger info: hist:name=foo:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active] - # - - { skbaddr: ffff88000ad53500 } hitcount: 1 len: 46 - { skbaddr: ffff8800af5a1500 } hitcount: 1 len: 76 - { skbaddr: ffff8800d62a1900 } hitcount: 1 len: 46 - { skbaddr: ffff8800d2bccb00 } hitcount: 1 len: 468 - { skbaddr: ffff8800d3c69900 } hitcount: 1 len: 46 - { skbaddr: ffff88009ff09100 } hitcount: 1 len: 52 - { skbaddr: ffff88010f13ab00 } hitcount: 1 len: 168 - { skbaddr: ffff88006a54f400 } hitcount: 1 len: 46 - { skbaddr: ffff8800d2bcc500 } hitcount: 1 len: 260 - { skbaddr: ffff880064505000 } hitcount: 1 len: 46 - { skbaddr: ffff8800baf24e00 } hitcount: 1 len: 32 - { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 46 - { skbaddr: ffff8800d3edff00 } hitcount: 1 len: 44 - { skbaddr: ffff88009fe0b400 } hitcount: 1 len: 168 - { skbaddr: ffff8800a1c55a00 } hitcount: 1 len: 40 - { skbaddr: ffff8800d2bcd100 } hitcount: 1 len: 40 - { skbaddr: ffff880064505f00 } hitcount: 1 len: 174 - { skbaddr: ffff8800a8bff200 } hitcount: 1 len: 160 - { skbaddr: ffff880044e3cc00 } hitcount: 1 len: 76 - { skbaddr: ffff8800a8bfe700 } hitcount: 1 len: 46 - { skbaddr: ffff8800d2bcdc00 } hitcount: 1 len: 32 - { skbaddr: ffff8800a1f64800 } hitcount: 1 len: 46 - { skbaddr: ffff8800d2bcde00 } hitcount: 1 len: 988 - { skbaddr: ffff88006a5dea00 } hitcount: 1 len: 46 - { skbaddr: ffff88002e37a200 } hitcount: 1 len: 44 - { skbaddr: ffff8800a1f32c00 } hitcount: 2 len: 676 - { skbaddr: ffff88000ad52600 } hitcount: 2 len: 107 - { skbaddr: ffff8800a1f91e00 } hitcount: 2 len: 92 - { skbaddr: ffff8800af5a0200 } hitcount: 2 len: 142 - { skbaddr: ffff8800d2bcc600 } hitcount: 2 len: 220 - { skbaddr: ffff8800ba36f500 } hitcount: 2 len: 92 - { skbaddr: ffff8800d021f800 } hitcount: 2 len: 92 - { skbaddr: ffff8800a1f33600 } hitcount: 2 len: 675 - { skbaddr: ffff8800a8bfff00 } hitcount: 3 len: 138 - { skbaddr: ffff8800d62a1300 } hitcount: 3 len: 138 - { skbaddr: ffff88002e37a100 } hitcount: 4 len: 184 - { skbaddr: ffff880064504400 } hitcount: 4 len: 184 - { skbaddr: ffff8800a8bfec00 } hitcount: 4 len: 184 - { skbaddr: ffff88000ad53700 } hitcount: 5 len: 230 - { skbaddr: ffff8800d2bcdb00 } hitcount: 5 len: 196 - { skbaddr: ffff8800a1f90000 } hitcount: 6 len: 276 - { skbaddr: ffff88006a54f900 } hitcount: 6 len: 276 - - Totals: - Hits: 81 - Entries: 42 - Dropped: 0 - # event histogram - # - # trigger info: hist:name=foo:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active] - # - - { skbaddr: ffff88000ad53500 } hitcount: 1 len: 46 - { skbaddr: ffff8800af5a1500 } hitcount: 1 len: 76 - { skbaddr: ffff8800d62a1900 } hitcount: 1 len: 46 - { skbaddr: ffff8800d2bccb00 } hitcount: 1 len: 468 - { skbaddr: ffff8800d3c69900 } hitcount: 1 len: 46 - { skbaddr: ffff88009ff09100 } hitcount: 1 len: 52 - { skbaddr: ffff88010f13ab00 } hitcount: 1 len: 168 - { skbaddr: ffff88006a54f400 } hitcount: 1 len: 46 - { skbaddr: ffff8800d2bcc500 } hitcount: 1 len: 260 - { skbaddr: ffff880064505000 } hitcount: 1 len: 46 - { skbaddr: ffff8800baf24e00 } hitcount: 1 len: 32 - { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 46 - { skbaddr: ffff8800d3edff00 } hitcount: 1 len: 44 - { skbaddr: ffff88009fe0b400 } hitcount: 1 len: 168 - { skbaddr: ffff8800a1c55a00 } hitcount: 1 len: 40 - { skbaddr: ffff8800d2bcd100 } hitcount: 1 len: 40 - { skbaddr: ffff880064505f00 } hitcount: 1 len: 174 - { skbaddr: ffff8800a8bff200 } hitcount: 1 len: 160 - { skbaddr: ffff880044e3cc00 } hitcount: 1 len: 76 - { skbaddr: ffff8800a8bfe700 } hitcount: 1 len: 46 - { skbaddr: ffff8800d2bcdc00 } hitcount: 1 len: 32 - { skbaddr: ffff8800a1f64800 } hitcount: 1 len: 46 - { skbaddr: ffff8800d2bcde00 } hitcount: 1 len: 988 - { skbaddr: ffff88006a5dea00 } hitcount: 1 len: 46 - { skbaddr: ffff88002e37a200 } hitcount: 1 len: 44 - { skbaddr: ffff8800a1f32c00 } hitcount: 2 len: 676 - { skbaddr: ffff88000ad52600 } hitcount: 2 len: 107 - { skbaddr: ffff8800a1f91e00 } hitcount: 2 len: 92 - { skbaddr: ffff8800af5a0200 } hitcount: 2 len: 142 - { skbaddr: ffff8800d2bcc600 } hitcount: 2 len: 220 - { skbaddr: ffff8800ba36f500 } hitcount: 2 len: 92 - { skbaddr: ffff8800d021f800 } hitcount: 2 len: 92 - { skbaddr: ffff8800a1f33600 } hitcount: 2 len: 675 - { skbaddr: ffff8800a8bfff00 } hitcount: 3 len: 138 - { skbaddr: ffff8800d62a1300 } hitcount: 3 len: 138 - { skbaddr: ffff88002e37a100 } hitcount: 4 len: 184 - { skbaddr: ffff880064504400 } hitcount: 4 len: 184 - { skbaddr: ffff8800a8bfec00 } hitcount: 4 len: 184 - { skbaddr: ffff88000ad53700 } hitcount: 5 len: 230 - { skbaddr: ffff8800d2bcdb00 } hitcount: 5 len: 196 - { skbaddr: ffff8800a1f90000 } hitcount: 6 len: 276 - { skbaddr: ffff88006a54f900 } hitcount: 6 len: 276 - - Totals: - Hits: 81 - Entries: 42 - Dropped: 0 - - And here's an example that shows how to combine histogram data from - any two events even if they don't share any 'compatible' fields - other than 'hitcount' and 'stacktrace'. These commands create a - couple of triggers named 'bar' using those fields: - - # echo 'hist:name=bar:key=stacktrace:val=hitcount' > \ - /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger - # echo 'hist:name=bar:key=stacktrace:val=hitcount' > \ - /sys/kernel/debug/tracing/events/net/netif_rx/trigger - - And displaying the output of either shows some interesting if - somewhat confusing output: - - # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist - # cat /sys/kernel/debug/tracing/events/net/netif_rx/hist - - # event histogram - # - # trigger info: hist:name=bar:keys=stacktrace:vals=hitcount:sort=hitcount:size=2048 [active] - # - - { stacktrace: - _do_fork+0x18e/0x330 - kernel_thread+0x29/0x30 - kthreadd+0x154/0x1b0 - ret_from_fork+0x3f/0x70 - } hitcount: 1 - { stacktrace: - netif_rx_internal+0xb2/0xd0 - netif_rx_ni+0x20/0x70 - dev_loopback_xmit+0xaa/0xd0 - ip_mc_output+0x126/0x240 - ip_local_out_sk+0x31/0x40 - igmp_send_report+0x1e9/0x230 - igmp_timer_expire+0xe9/0x120 - call_timer_fn+0x39/0xf0 - run_timer_softirq+0x1e1/0x290 - __do_softirq+0xfd/0x290 - irq_exit+0x98/0xb0 - smp_apic_timer_interrupt+0x4a/0x60 - apic_timer_interrupt+0x6d/0x80 - cpuidle_enter+0x17/0x20 - call_cpuidle+0x3b/0x60 - cpu_startup_entry+0x22d/0x310 - } hitcount: 1 - { stacktrace: - netif_rx_internal+0xb2/0xd0 - netif_rx_ni+0x20/0x70 - dev_loopback_xmit+0xaa/0xd0 - ip_mc_output+0x17f/0x240 - ip_local_out_sk+0x31/0x40 - ip_send_skb+0x1a/0x50 - udp_send_skb+0x13e/0x270 - udp_sendmsg+0x2bf/0x980 - inet_sendmsg+0x67/0xa0 - sock_sendmsg+0x38/0x50 - SYSC_sendto+0xef/0x170 - SyS_sendto+0xe/0x10 - entry_SYSCALL_64_fastpath+0x12/0x6a - } hitcount: 2 - { stacktrace: - netif_rx_internal+0xb2/0xd0 - netif_rx+0x1c/0x60 - loopback_xmit+0x6c/0xb0 - dev_hard_start_xmit+0x219/0x3a0 - __dev_queue_xmit+0x415/0x4f0 - dev_queue_xmit_sk+0x13/0x20 - ip_finish_output2+0x237/0x340 - ip_finish_output+0x113/0x1d0 - ip_output+0x66/0xc0 - ip_local_out_sk+0x31/0x40 - ip_send_skb+0x1a/0x50 - udp_send_skb+0x16d/0x270 - udp_sendmsg+0x2bf/0x980 - inet_sendmsg+0x67/0xa0 - sock_sendmsg+0x38/0x50 - ___sys_sendmsg+0x14e/0x270 - } hitcount: 76 - { stacktrace: - netif_rx_internal+0xb2/0xd0 - netif_rx+0x1c/0x60 - loopback_xmit+0x6c/0xb0 - dev_hard_start_xmit+0x219/0x3a0 - __dev_queue_xmit+0x415/0x4f0 - dev_queue_xmit_sk+0x13/0x20 - ip_finish_output2+0x237/0x340 - ip_finish_output+0x113/0x1d0 - ip_output+0x66/0xc0 - ip_local_out_sk+0x31/0x40 - ip_send_skb+0x1a/0x50 - udp_send_skb+0x16d/0x270 - udp_sendmsg+0x2bf/0x980 - inet_sendmsg+0x67/0xa0 - sock_sendmsg+0x38/0x50 - ___sys_sendmsg+0x269/0x270 - } hitcount: 77 - { stacktrace: - netif_rx_internal+0xb2/0xd0 - netif_rx+0x1c/0x60 - loopback_xmit+0x6c/0xb0 - dev_hard_start_xmit+0x219/0x3a0 - __dev_queue_xmit+0x415/0x4f0 - dev_queue_xmit_sk+0x13/0x20 - ip_finish_output2+0x237/0x340 - ip_finish_output+0x113/0x1d0 - ip_output+0x66/0xc0 - ip_local_out_sk+0x31/0x40 - ip_send_skb+0x1a/0x50 - udp_send_skb+0x16d/0x270 - udp_sendmsg+0x2bf/0x980 - inet_sendmsg+0x67/0xa0 - sock_sendmsg+0x38/0x50 - SYSC_sendto+0xef/0x170 - } hitcount: 88 - { stacktrace: - _do_fork+0x18e/0x330 - SyS_clone+0x19/0x20 - entry_SYSCALL_64_fastpath+0x12/0x6a - } hitcount: 244 - - Totals: - Hits: 489 - Entries: 7 - Dropped: 0 + See Documentation/trace/histogram.txt for details and examples. Index: linux-4.14.15-rt12/Documentation/trace/ftrace.txt =================================================================== --- linux-4.14.15-rt12.orig/Documentation/trace/ftrace.txt +++ linux-4.14.15-rt12/Documentation/trace/ftrace.txt @@ -539,6 +539,30 @@ of ftrace. Here is a list of some of the See events.txt for more information. + timestamp_mode: + + Certain tracers may change the timestamp mode used when + logging trace events into the event buffer. Events with + different modes can coexist within a buffer but the mode in + effect when an event is logged determines which timestamp mode + is used for that event. The default timestamp mode is + 'delta'. + + Usual timestamp modes for tracing: + + # cat timestamp_mode + [delta] absolute + + The timestamp mode with the square brackets around it is the + one in effect. + + delta: Default timestamp mode - timestamp is a delta against + a per-buffer timestamp. + + absolute: The timestamp is a full timestamp, not a delta + against some other value. As such it takes up more + space and is less efficient. + hwlat_detector: Directory for the Hardware Latency Detector. Index: linux-4.14.15-rt12/Documentation/trace/histogram.txt =================================================================== --- /dev/null +++ linux-4.14.15-rt12/Documentation/trace/histogram.txt @@ -0,0 +1,1995 @@ + Event Histograms + + Documentation written by Tom Zanussi + +1. Introduction +=============== + + Histogram triggers are special event triggers that can be used to + aggregate trace event data into histograms. For information on + trace events and event triggers, see Documentation/trace/events.txt. + + +2. Histogram Trigger Command +============================ + + A histogram trigger command is an event trigger command that + aggregates event hits into a hash table keyed on one or more trace + event format fields (or stacktrace) and a set of running totals + derived from one or more trace event format fields and/or event + counts (hitcount). + + The format of a hist trigger is as follows: + + hist:keys=[:values=] + [:sort=][:size=#entries][:pause][:continue] + [:clear][:name=histname1] [if ] + + When a matching event is hit, an entry is added to a hash table + using the key(s) and value(s) named. Keys and values correspond to + fields in the event's format description. Values must correspond to + numeric fields - on an event hit, the value(s) will be added to a + sum kept for that field. The special string 'hitcount' can be used + in place of an explicit value field - this is simply a count of + event hits. If 'values' isn't specified, an implicit 'hitcount' + value will be automatically created and used as the only value. + Keys can be any field, or the special string 'stacktrace', which + will use the event's kernel stacktrace as the key. The keywords + 'keys' or 'key' can be used to specify keys, and the keywords + 'values', 'vals', or 'val' can be used to specify values. Compound + keys consisting of up to two fields can be specified by the 'keys' + keyword. Hashing a compound key produces a unique entry in the + table for each unique combination of component keys, and can be + useful for providing more fine-grained summaries of event data. + Additionally, sort keys consisting of up to two fields can be + specified by the 'sort' keyword. If more than one field is + specified, the result will be a 'sort within a sort': the first key + is taken to be the primary sort key and the second the secondary + key. If a hist trigger is given a name using the 'name' parameter, + its histogram data will be shared with other triggers of the same + name, and trigger hits will update this common data. Only triggers + with 'compatible' fields can be combined in this way; triggers are + 'compatible' if the fields named in the trigger share the same + number and type of fields and those fields also have the same names. + Note that any two events always share the compatible 'hitcount' and + 'stacktrace' fields and can therefore be combined using those + fields, however pointless that may be. + + 'hist' triggers add a 'hist' file to each event's subdirectory. + Reading the 'hist' file for the event will dump the hash table in + its entirety to stdout. If there are multiple hist triggers + attached to an event, there will be a table for each trigger in the + output. The table displayed for a named trigger will be the same as + any other instance having the same name. Each printed hash table + entry is a simple list of the keys and values comprising the entry; + keys are printed first and are delineated by curly braces, and are + followed by the set of value fields for the entry. By default, + numeric fields are displayed as base-10 integers. This can be + modified by appending any of the following modifiers to the field + name: + + .hex display a number as a hex value + .sym display an address as a symbol + .sym-offset display an address as a symbol and offset + .syscall display a syscall id as a system call name + .execname display a common_pid as a program name + .log2 display log2 value rather than raw number + .usecs display a common_timestamp in microseconds + + Note that in general the semantics of a given field aren't + interpreted when applying a modifier to it, but there are some + restrictions to be aware of in this regard: + + - only the 'hex' modifier can be used for values (because values + are essentially sums, and the other modifiers don't make sense + in that context). + - the 'execname' modifier can only be used on a 'common_pid'. The + reason for this is that the execname is simply the 'comm' value + saved for the 'current' process when an event was triggered, + which is the same as the common_pid value saved by the event + tracing code. Trying to apply that comm value to other pid + values wouldn't be correct, and typically events that care save + pid-specific comm fields in the event itself. + + A typical usage scenario would be the following to enable a hist + trigger, read its current contents, and then turn it off: + + # echo 'hist:keys=skbaddr.hex:vals=len' > \ + /sys/kernel/debug/tracing/events/net/netif_rx/trigger + + # cat /sys/kernel/debug/tracing/events/net/netif_rx/hist + + # echo '!hist:keys=skbaddr.hex:vals=len' > \ + /sys/kernel/debug/tracing/events/net/netif_rx/trigger + + The trigger file itself can be read to show the details of the + currently attached hist trigger. This information is also displayed + at the top of the 'hist' file when read. + + By default, the size of the hash table is 2048 entries. The 'size' + parameter can be used to specify more or fewer than that. The units + are in terms of hashtable entries - if a run uses more entries than + specified, the results will show the number of 'drops', the number + of hits that were ignored. The size should be a power of 2 between + 128 and 131072 (any non- power-of-2 number specified will be rounded + up). + + The 'sort' parameter can be used to specify a value field to sort + on. The default if unspecified is 'hitcount' and the default sort + order is 'ascending'. To sort in the opposite direction, append + .descending' to the sort key. + + The 'pause' parameter can be used to pause an existing hist trigger + or to start a hist trigger but not log any events until told to do + so. 'continue' or 'cont' can be used to start or restart a paused + hist trigger. + + The 'clear' parameter will clear the contents of a running hist + trigger and leave its current paused/active state. + + Note that the 'pause', 'cont', and 'clear' parameters should be + applied using 'append' shell operator ('>>') if applied to an + existing trigger, rather than via the '>' operator, which will cause + the trigger to be removed through truncation. + +- enable_hist/disable_hist + + The enable_hist and disable_hist triggers can be used to have one + event conditionally start and stop another event's already-attached + hist trigger. Any number of enable_hist and disable_hist triggers + can be attached to a given event, allowing that event to kick off + and stop aggregations on a host of other events. + + The format is very similar to the enable/disable_event triggers: + + enable_hist::[:count] + disable_hist::[:count] + + Instead of enabling or disabling the tracing of the target event + into the trace buffer as the enable/disable_event triggers do, the + enable/disable_hist triggers enable or disable the aggregation of + the target event into a hash table. + + A typical usage scenario for the enable_hist/disable_hist triggers + would be to first set up a paused hist trigger on some event, + followed by an enable_hist/disable_hist pair that turns the hist + aggregation on and off when conditions of interest are hit: + + # echo 'hist:keys=skbaddr.hex:vals=len:pause' > \ + /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger + + # echo 'enable_hist:net:netif_receive_skb if filename==/usr/bin/wget' > \ + /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger + + # echo 'disable_hist:net:netif_receive_skb if comm==wget' > \ + /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger + + The above sets up an initially paused hist trigger which is unpaused + and starts aggregating events when a given program is executed, and + which stops aggregating when the process exits and the hist trigger + is paused again. + + The examples below provide a more concrete illustration of the + concepts and typical usage patterns discussed above. + + 'special' event fields + ------------------------ + + There are a number of 'special event fields' available for use as + keys or values in a hist trigger. These look like and behave as if + they were actual event fields, but aren't really part of the event's + field definition or format file. They are however available for any + event, and can be used anywhere an actual event field could be. + They are: + + common_timestamp u64 - timestamp (from ring buffer) associated + with the event, in nanoseconds. May be + modified by .usecs to have timestamps + interpreted as microseconds. + cpu int - the cpu on which the event occurred. + + Extended error information + -------------------------- + + For some error conditions encountered when invoking a hist trigger + command, extended error information is available via the + corresponding event's 'hist' file. Reading the hist file after an + error will display more detailed information about what went wrong, + if information is available. This extended error information will + be available until the next hist trigger command for that event. + + If available for a given error condition, the extended error + information and usage takes the following form: + + # echo xxx > /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger + echo: write error: Invalid argument + + # cat /sys/kernel/debug/tracing/events/sched/sched_wakeup/hist + ERROR: Couldn't yyy: zzz + Last command: xxx + +6.2 'hist' trigger examples +--------------------------- + + The first set of examples creates aggregations using the kmalloc + event. The fields that can be used for the hist trigger are listed + in the kmalloc event's format file: + + # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/format + name: kmalloc + ID: 374 + format: + field:unsigned short common_type; offset:0; size:2; signed:0; + field:unsigned char common_flags; offset:2; size:1; signed:0; + field:unsigned char common_preempt_count; offset:3; size:1; signed:0; + field:int common_pid; offset:4; size:4; signed:1; + + field:unsigned long call_site; offset:8; size:8; signed:0; + field:const void * ptr; offset:16; size:8; signed:0; + field:size_t bytes_req; offset:24; size:8; signed:0; + field:size_t bytes_alloc; offset:32; size:8; signed:0; + field:gfp_t gfp_flags; offset:40; size:4; signed:0; + + We'll start by creating a hist trigger that generates a simple table + that lists the total number of bytes requested for each function in + the kernel that made one or more calls to kmalloc: + + # echo 'hist:key=call_site:val=bytes_req' > \ + /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger + + This tells the tracing system to create a 'hist' trigger using the + call_site field of the kmalloc event as the key for the table, which + just means that each unique call_site address will have an entry + created for it in the table. The 'val=bytes_req' parameter tells + the hist trigger that for each unique entry (call_site) in the + table, it should keep a running total of the number of bytes + requested by that call_site. + + We'll let it run for awhile and then dump the contents of the 'hist' + file in the kmalloc event's subdirectory (for readability, a number + of entries have been omitted): + + # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist + # trigger info: hist:keys=call_site:vals=bytes_req:sort=hitcount:size=2048 [active] + + { call_site: 18446744072106379007 } hitcount: 1 bytes_req: 176 + { call_site: 18446744071579557049 } hitcount: 1 bytes_req: 1024 + { call_site: 18446744071580608289 } hitcount: 1 bytes_req: 16384 + { call_site: 18446744071581827654 } hitcount: 1 bytes_req: 24 + { call_site: 18446744071580700980 } hitcount: 1 bytes_req: 8 + { call_site: 18446744071579359876 } hitcount: 1 bytes_req: 152 + { call_site: 18446744071580795365 } hitcount: 3 bytes_req: 144 + { call_site: 18446744071581303129 } hitcount: 3 bytes_req: 144 + { call_site: 18446744071580713234 } hitcount: 4 bytes_req: 2560 + { call_site: 18446744071580933750 } hitcount: 4 bytes_req: 736 + . + . + . + { call_site: 18446744072106047046 } hitcount: 69 bytes_req: 5576 + { call_site: 18446744071582116407 } hitcount: 73 bytes_req: 2336 + { call_site: 18446744072106054684 } hitcount: 136 bytes_req: 140504 + { call_site: 18446744072106224230 } hitcount: 136 bytes_req: 19584 + { call_site: 18446744072106078074 } hitcount: 153 bytes_req: 2448 + { call_site: 18446744072106062406 } hitcount: 153 bytes_req: 36720 + { call_site: 18446744071582507929 } hitcount: 153 bytes_req: 37088 + { call_site: 18446744072102520590 } hitcount: 273 bytes_req: 10920 + { call_site: 18446744071582143559 } hitcount: 358 bytes_req: 716 + { call_site: 18446744072106465852 } hitcount: 417 bytes_req: 56712 + { call_site: 18446744072102523378 } hitcount: 485 bytes_req: 27160 + { call_site: 18446744072099568646 } hitcount: 1676 bytes_req: 33520 + + Totals: + Hits: 4610 + Entries: 45 + Dropped: 0 + + The output displays a line for each entry, beginning with the key + specified in the trigger, followed by the value(s) also specified in + the trigger. At the beginning of the output is a line that displays + the trigger info, which can also be displayed by reading the + 'trigger' file: + + # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger + hist:keys=call_site:vals=bytes_req:sort=hitcount:size=2048 [active] + + At the end of the output are a few lines that display the overall + totals for the run. The 'Hits' field shows the total number of + times the event trigger was hit, the 'Entries' field shows the total + number of used entries in the hash table, and the 'Dropped' field + shows the number of hits that were dropped because the number of + used entries for the run exceeded the maximum number of entries + allowed for the table (normally 0, but if not a hint that you may + want to increase the size of the table using the 'size' parameter). + + Notice in the above output that there's an extra field, 'hitcount', + which wasn't specified in the trigger. Also notice that in the + trigger info output, there's a parameter, 'sort=hitcount', which + wasn't specified in the trigger either. The reason for that is that + every trigger implicitly keeps a count of the total number of hits + attributed to a given entry, called the 'hitcount'. That hitcount + information is explicitly displayed in the output, and in the + absence of a user-specified sort parameter, is used as the default + sort field. + + The value 'hitcount' can be used in place of an explicit value in + the 'values' parameter if you don't really need to have any + particular field summed and are mainly interested in hit + frequencies. + + To turn the hist trigger off, simply call up the trigger in the + command history and re-execute it with a '!' prepended: + + # echo '!hist:key=call_site:val=bytes_req' > \ + /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger + + Finally, notice that the call_site as displayed in the output above + isn't really very useful. It's an address, but normally addresses + are displayed in hex. To have a numeric field displayed as a hex + value, simply append '.hex' to the field name in the trigger: + + # echo 'hist:key=call_site.hex:val=bytes_req' > \ + /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger + + # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist + # trigger info: hist:keys=call_site.hex:vals=bytes_req:sort=hitcount:size=2048 [active] + + { call_site: ffffffffa026b291 } hitcount: 1 bytes_req: 433 + { call_site: ffffffffa07186ff } hitcount: 1 bytes_req: 176 + { call_site: ffffffff811ae721 } hitcount: 1 bytes_req: 16384 + { call_site: ffffffff811c5134 } hitcount: 1 bytes_req: 8 + { call_site: ffffffffa04a9ebb } hitcount: 1 bytes_req: 511 + { call_site: ffffffff8122e0a6 } hitcount: 1 bytes_req: 12 + { call_site: ffffffff8107da84 } hitcount: 1 bytes_req: 152 + { call_site: ffffffff812d8246 } hitcount: 1 bytes_req: 24 + { call_site: ffffffff811dc1e5 } hitcount: 3 bytes_req: 144 + { call_site: ffffffffa02515e8 } hitcount: 3 bytes_req: 648 + { call_site: ffffffff81258159 } hitcount: 3 bytes_req: 144 + { call_site: ffffffff811c80f4 } hitcount: 4 bytes_req: 544 + . + . + . + { call_site: ffffffffa06c7646 } hitcount: 106 bytes_req: 8024 + { call_site: ffffffffa06cb246 } hitcount: 132 bytes_req: 31680 + { call_site: ffffffffa06cef7a } hitcount: 132 bytes_req: 2112 + { call_site: ffffffff8137e399 } hitcount: 132 bytes_req: 23232 + { call_site: ffffffffa06c941c } hitcount: 185 bytes_req: 171360 + { call_site: ffffffffa06f2a66 } hitcount: 185 bytes_req: 26640 + { call_site: ffffffffa036a70e } hitcount: 265 bytes_req: 10600 + { call_site: ffffffff81325447 } hitcount: 292 bytes_req: 584 + { call_site: ffffffffa072da3c } hitcount: 446 bytes_req: 60656 + { call_site: ffffffffa036b1f2 } hitcount: 526 bytes_req: 29456 + { call_site: ffffffffa0099c06 } hitcount: 1780 bytes_req: 35600 + + Totals: + Hits: 4775 + Entries: 46 + Dropped: 0 + + Even that's only marginally more useful - while hex values do look + more like addresses, what users are typically more interested in + when looking at text addresses are the corresponding symbols + instead. To have an address displayed as symbolic value instead, + simply append '.sym' or '.sym-offset' to the field name in the + trigger: + + # echo 'hist:key=call_site.sym:val=bytes_req' > \ + /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger + + # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist + # trigger info: hist:keys=call_site.sym:vals=bytes_req:sort=hitcount:size=2048 [active] + + { call_site: [ffffffff810adcb9] syslog_print_all } hitcount: 1 bytes_req: 1024 + { call_site: [ffffffff8154bc62] usb_control_msg } hitcount: 1 bytes_req: 8 + { call_site: [ffffffffa00bf6fe] hidraw_send_report [hid] } hitcount: 1 bytes_req: 7 + { call_site: [ffffffff8154acbe] usb_alloc_urb } hitcount: 1 bytes_req: 192 + { call_site: [ffffffffa00bf1ca] hidraw_report_event [hid] } hitcount: 1 bytes_req: 7 + { call_site: [ffffffff811e3a25] __seq_open_private } hitcount: 1 bytes_req: 40 + { call_site: [ffffffff8109524a] alloc_fair_sched_group } hitcount: 2 bytes_req: 128 + { call_site: [ffffffff811febd5] fsnotify_alloc_group } hitcount: 2 bytes_req: 528 + { call_site: [ffffffff81440f58] __tty_buffer_request_room } hitcount: 2 bytes_req: 2624 + { call_site: [ffffffff81200ba6] inotify_new_group } hitcount: 2 bytes_req: 96 + { call_site: [ffffffffa05e19af] ieee80211_start_tx_ba_session [mac80211] } hitcount: 2 bytes_req: 464 + { call_site: [ffffffff81672406] tcp_get_metrics } hitcount: 2 bytes_req: 304 + { call_site: [ffffffff81097ec2] alloc_rt_sched_group } hitcount: 2 bytes_req: 128 + { call_site: [ffffffff81089b05] sched_create_group } hitcount: 2 bytes_req: 1424 + . + . + . + { call_site: [ffffffffa04a580c] intel_crtc_page_flip [i915] } hitcount: 1185 bytes_req: 123240 + { call_site: [ffffffffa0287592] drm_mode_page_flip_ioctl [drm] } hitcount: 1185 bytes_req: 104280 + { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state [i915] } hitcount: 1402 bytes_req: 190672 + { call_site: [ffffffff812891ca] ext4_find_extent } hitcount: 1518 bytes_req: 146208 + { call_site: [ffffffffa029070e] drm_vma_node_allow [drm] } hitcount: 1746 bytes_req: 69840 + { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 2021 bytes_req: 792312 + { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc [drm] } hitcount: 2592 bytes_req: 145152 + { call_site: [ffffffffa0489a66] intel_ring_begin [i915] } hitcount: 2629 bytes_req: 378576 + { call_site: [ffffffffa046041c] i915_gem_execbuffer2 [i915] } hitcount: 2629 bytes_req: 3783248 + { call_site: [ffffffff81325607] apparmor_file_alloc_security } hitcount: 5192 bytes_req: 10384 + { call_site: [ffffffffa00b7c06] hid_report_raw_event [hid] } hitcount: 5529 bytes_req: 110584 + { call_site: [ffffffff8131ebf7] aa_alloc_task_context } hitcount: 21943 bytes_req: 702176 + { call_site: [ffffffff8125847d] ext4_htree_store_dirent } hitcount: 55759 bytes_req: 5074265 + + Totals: + Hits: 109928 + Entries: 71 + Dropped: 0 + + Because the default sort key above is 'hitcount', the above shows a + the list of call_sites by increasing hitcount, so that at the bottom + we see the functions that made the most kmalloc calls during the + run. If instead we we wanted to see the top kmalloc callers in + terms of the number of bytes requested rather than the number of + calls, and we wanted the top caller to appear at the top, we can use + the 'sort' parameter, along with the 'descending' modifier: + + # echo 'hist:key=call_site.sym:val=bytes_req:sort=bytes_req.descending' > \ + /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger + + # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist + # trigger info: hist:keys=call_site.sym:vals=bytes_req:sort=bytes_req.descending:size=2048 [active] + + { call_site: [ffffffffa046041c] i915_gem_execbuffer2 [i915] } hitcount: 2186 bytes_req: 3397464 + { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 1790 bytes_req: 712176 + { call_site: [ffffffff8125847d] ext4_htree_store_dirent } hitcount: 8132 bytes_req: 513135 + { call_site: [ffffffff811e2a1b] seq_buf_alloc } hitcount: 106 bytes_req: 440128 + { call_site: [ffffffffa0489a66] intel_ring_begin [i915] } hitcount: 2186 bytes_req: 314784 + { call_site: [ffffffff812891ca] ext4_find_extent } hitcount: 2174 bytes_req: 208992 + { call_site: [ffffffff811ae8e1] __kmalloc } hitcount: 8 bytes_req: 131072 + { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state [i915] } hitcount: 859 bytes_req: 116824 + { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc [drm] } hitcount: 1834 bytes_req: 102704 + { call_site: [ffffffffa04a580c] intel_crtc_page_flip [i915] } hitcount: 972 bytes_req: 101088 + { call_site: [ffffffffa0287592] drm_mode_page_flip_ioctl [drm] } hitcount: 972 bytes_req: 85536 + { call_site: [ffffffffa00b7c06] hid_report_raw_event [hid] } hitcount: 3333 bytes_req: 66664 + { call_site: [ffffffff8137e559] sg_kmalloc } hitcount: 209 bytes_req: 61632 + . + . + . + { call_site: [ffffffff81095225] alloc_fair_sched_group } hitcount: 2 bytes_req: 128 + { call_site: [ffffffff81097ec2] alloc_rt_sched_group } hitcount: 2 bytes_req: 128 + { call_site: [ffffffff812d8406] copy_semundo } hitcount: 2 bytes_req: 48 + { call_site: [ffffffff81200ba6] inotify_new_group } hitcount: 1 bytes_req: 48 + { call_site: [ffffffffa027121a] drm_getmagic [drm] } hitcount: 1 bytes_req: 48 + { call_site: [ffffffff811e3a25] __seq_open_private } hitcount: 1 bytes_req: 40 + { call_site: [ffffffff811c52f4] bprm_change_interp } hitcount: 2 bytes_req: 16 + { call_site: [ffffffff8154bc62] usb_control_msg } hitcount: 1 bytes_req: 8 + { call_site: [ffffffffa00bf1ca] hidraw_report_event [hid] } hitcount: 1 bytes_req: 7 + { call_site: [ffffffffa00bf6fe] hidraw_send_report [hid] } hitcount: 1 bytes_req: 7 + + Totals: + Hits: 32133 + Entries: 81 + Dropped: 0 + + To display the offset and size information in addition to the symbol + name, just use 'sym-offset' instead: + + # echo 'hist:key=call_site.sym-offset:val=bytes_req:sort=bytes_req.descending' > \ + /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger + + # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist + # trigger info: hist:keys=call_site.sym-offset:vals=bytes_req:sort=bytes_req.descending:size=2048 [active] + + { call_site: [ffffffffa046041c] i915_gem_execbuffer2+0x6c/0x2c0 [i915] } hitcount: 4569 bytes_req: 3163720 + { call_site: [ffffffffa0489a66] intel_ring_begin+0xc6/0x1f0 [i915] } hitcount: 4569 bytes_req: 657936 + { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23+0x694/0x1020 [i915] } hitcount: 1519 bytes_req: 472936 + { call_site: [ffffffffa045e646] i915_gem_do_execbuffer.isra.23+0x516/0x1020 [i915] } hitcount: 3050 bytes_req: 211832 + { call_site: [ffffffff811e2a1b] seq_buf_alloc+0x1b/0x50 } hitcount: 34 bytes_req: 148384 + { call_site: [ffffffffa04a580c] intel_crtc_page_flip+0xbc/0x870 [i915] } hitcount: 1385 bytes_req: 144040 + { call_site: [ffffffff811ae8e1] __kmalloc+0x191/0x1b0 } hitcount: 8 bytes_req: 131072 + { call_site: [ffffffffa0287592] drm_mode_page_flip_ioctl+0x282/0x360 [drm] } hitcount: 1385 bytes_req: 121880 + { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc+0x32/0x100 [drm] } hitcount: 1848 bytes_req: 103488 + { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state+0x2c/0xa0 [i915] } hitcount: 461 bytes_req: 62696 + { call_site: [ffffffffa029070e] drm_vma_node_allow+0x2e/0xd0 [drm] } hitcount: 1541 bytes_req: 61640 + { call_site: [ffffffff815f8d7b] sk_prot_alloc+0xcb/0x1b0 } hitcount: 57 bytes_req: 57456 + . + . + . + { call_site: [ffffffff8109524a] alloc_fair_sched_group+0x5a/0x1a0 } hitcount: 2 bytes_req: 128 + { call_site: [ffffffffa027b921] drm_vm_open_locked+0x31/0xa0 [drm] } hitcount: 3 bytes_req: 96 + { call_site: [ffffffff8122e266] proc_self_follow_link+0x76/0xb0 } hitcount: 8 bytes_req: 96 + { call_site: [ffffffff81213e80] load_elf_binary+0x240/0x1650 } hitcount: 3 bytes_req: 84 + { call_site: [ffffffff8154bc62] usb_control_msg+0x42/0x110 } hitcount: 1 bytes_req: 8 + { call_site: [ffffffffa00bf6fe] hidraw_send_report+0x7e/0x1a0 [hid] } hitcount: 1 bytes_req: 7 + { call_site: [ffffffffa00bf1ca] hidraw_report_event+0x8a/0x120 [hid] } hitcount: 1 bytes_req: 7 + + Totals: + Hits: 26098 + Entries: 64 + Dropped: 0 + + We can also add multiple fields to the 'values' parameter. For + example, we might want to see the total number of bytes allocated + alongside bytes requested, and display the result sorted by bytes + allocated in a descending order: + + # echo 'hist:keys=call_site.sym:values=bytes_req,bytes_alloc:sort=bytes_alloc.descending' > \ + /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger + + # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist + # trigger info: hist:keys=call_site.sym:vals=bytes_req,bytes_alloc:sort=bytes_alloc.descending:size=2048 [active] + + { call_site: [ffffffffa046041c] i915_gem_execbuffer2 [i915] } hitcount: 7403 bytes_req: 4084360 bytes_alloc: 5958016 + { call_site: [ffffffff811e2a1b] seq_buf_alloc } hitcount: 541 bytes_req: 2213968 bytes_alloc: 2228224 + { call_site: [ffffffffa0489a66] intel_ring_begin [i915] } hitcount: 7404 bytes_req: 1066176 bytes_alloc: 1421568 + { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 1565 bytes_req: 557368 bytes_alloc: 1037760 + { call_site: [ffffffff8125847d] ext4_htree_store_dirent } hitcount: 9557 bytes_req: 595778 bytes_alloc: 695744 + { call_site: [ffffffffa045e646] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 5839 bytes_req: 430680 bytes_alloc: 470400 + { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state [i915] } hitcount: 2388 bytes_req: 324768 bytes_alloc: 458496 + { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc [drm] } hitcount: 3911 bytes_req: 219016 bytes_alloc: 250304 + { call_site: [ffffffff815f8d7b] sk_prot_alloc } hitcount: 235 bytes_req: 236880 bytes_alloc: 240640 + { call_site: [ffffffff8137e559] sg_kmalloc } hitcount: 557 bytes_req: 169024 bytes_alloc: 221760 + { call_site: [ffffffffa00b7c06] hid_report_raw_event [hid] } hitcount: 9378 bytes_req: 187548 bytes_alloc: 206312 + { call_site: [ffffffffa04a580c] intel_crtc_page_flip [i915] } hitcount: 1519 bytes_req: 157976 bytes_alloc: 194432 + . + . + . + { call_site: [ffffffff8109bd3b] sched_autogroup_create_attach } hitcount: 2 bytes_req: 144 bytes_alloc: 192 + { call_site: [ffffffff81097ee8] alloc_rt_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128 + { call_site: [ffffffff8109524a] alloc_fair_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128 + { call_site: [ffffffff81095225] alloc_fair_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128 + { call_site: [ffffffff81097ec2] alloc_rt_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128 + { call_site: [ffffffff81213e80] load_elf_binary } hitcount: 3 bytes_req: 84 bytes_alloc: 96 + { call_site: [ffffffff81079a2e] kthread_create_on_node } hitcount: 1 bytes_req: 56 bytes_alloc: 64 + { call_site: [ffffffffa00bf6fe] hidraw_send_report [hid] } hitcount: 1 bytes_req: 7 bytes_alloc: 8 + { call_site: [ffffffff8154bc62] usb_control_msg } hitcount: 1 bytes_req: 8 bytes_alloc: 8 + { call_site: [ffffffffa00bf1ca] hidraw_report_event [hid] } hitcount: 1 bytes_req: 7 bytes_alloc: 8 + + Totals: + Hits: 66598 + Entries: 65 + Dropped: 0 + + Finally, to finish off our kmalloc example, instead of simply having + the hist trigger display symbolic call_sites, we can have the hist + trigger additionally display the complete set of kernel stack traces + that led to each call_site. To do that, we simply use the special + value 'stacktrace' for the key parameter: + + # echo 'hist:keys=stacktrace:values=bytes_req,bytes_alloc:sort=bytes_alloc' > \ + /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger + + The above trigger will use the kernel stack trace in effect when an + event is triggered as the key for the hash table. This allows the + enumeration of every kernel callpath that led up to a particular + event, along with a running total of any of the event fields for + that event. Here we tally bytes requested and bytes allocated for + every callpath in the system that led up to a kmalloc (in this case + every callpath to a kmalloc for a kernel compile): + + # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist + # trigger info: hist:keys=stacktrace:vals=bytes_req,bytes_alloc:sort=bytes_alloc:size=2048 [active] + + { stacktrace: + __kmalloc_track_caller+0x10b/0x1a0 + kmemdup+0x20/0x50 + hidraw_report_event+0x8a/0x120 [hid] + hid_report_raw_event+0x3ea/0x440 [hid] + hid_input_report+0x112/0x190 [hid] + hid_irq_in+0xc2/0x260 [usbhid] + __usb_hcd_giveback_urb+0x72/0x120 + usb_giveback_urb_bh+0x9e/0xe0 + tasklet_hi_action+0xf8/0x100 + __do_softirq+0x114/0x2c0 + irq_exit+0xa5/0xb0 + do_IRQ+0x5a/0xf0 + ret_from_intr+0x0/0x30 + cpuidle_enter+0x17/0x20 + cpu_startup_entry+0x315/0x3e0 + rest_init+0x7c/0x80 + } hitcount: 3 bytes_req: 21 bytes_alloc: 24 + { stacktrace: + __kmalloc_track_caller+0x10b/0x1a0 + kmemdup+0x20/0x50 + hidraw_report_event+0x8a/0x120 [hid] + hid_report_raw_event+0x3ea/0x440 [hid] + hid_input_report+0x112/0x190 [hid] + hid_irq_in+0xc2/0x260 [usbhid] + __usb_hcd_giveback_urb+0x72/0x120 + usb_giveback_urb_bh+0x9e/0xe0 + tasklet_hi_action+0xf8/0x100 + __do_softirq+0x114/0x2c0 + irq_exit+0xa5/0xb0 + do_IRQ+0x5a/0xf0 + ret_from_intr+0x0/0x30 + } hitcount: 3 bytes_req: 21 bytes_alloc: 24 + { stacktrace: + kmem_cache_alloc_trace+0xeb/0x150 + aa_alloc_task_context+0x27/0x40 + apparmor_cred_prepare+0x1f/0x50 + security_prepare_creds+0x16/0x20 + prepare_creds+0xdf/0x1a0 + SyS_capset+0xb5/0x200 + system_call_fastpath+0x12/0x6a + } hitcount: 1 bytes_req: 32 bytes_alloc: 32 + . + . + . + { stacktrace: + __kmalloc+0x11b/0x1b0 + i915_gem_execbuffer2+0x6c/0x2c0 [i915] + drm_ioctl+0x349/0x670 [drm] + do_vfs_ioctl+0x2f0/0x4f0 + SyS_ioctl+0x81/0xa0 + system_call_fastpath+0x12/0x6a + } hitcount: 17726 bytes_req: 13944120 bytes_alloc: 19593808 + { stacktrace: + __kmalloc+0x11b/0x1b0 + load_elf_phdrs+0x76/0xa0 + load_elf_binary+0x102/0x1650 + search_binary_handler+0x97/0x1d0 + do_execveat_common.isra.34+0x551/0x6e0 + SyS_execve+0x3a/0x50 + return_from_execve+0x0/0x23 + } hitcount: 33348 bytes_req: 17152128 bytes_alloc: 20226048 + { stacktrace: + kmem_cache_alloc_trace+0xeb/0x150 + apparmor_file_alloc_security+0x27/0x40 + security_file_alloc+0x16/0x20 + get_empty_filp+0x93/0x1c0 + path_openat+0x31/0x5f0 + do_filp_open+0x3a/0x90 + do_sys_open+0x128/0x220 + SyS_open+0x1e/0x20 + system_call_fastpath+0x12/0x6a + } hitcount: 4766422 bytes_req: 9532844 bytes_alloc: 38131376 + { stacktrace: + __kmalloc+0x11b/0x1b0 + seq_buf_alloc+0x1b/0x50 + seq_read+0x2cc/0x370 + proc_reg_read+0x3d/0x80 + __vfs_read+0x28/0xe0 + vfs_read+0x86/0x140 + SyS_read+0x46/0xb0 + system_call_fastpath+0x12/0x6a + } hitcount: 19133 bytes_req: 78368768 bytes_alloc: 78368768 + + Totals: + Hits: 6085872 + Entries: 253 + Dropped: 0 + + If you key a hist trigger on common_pid, in order for example to + gather and display sorted totals for each process, you can use the + special .execname modifier to display the executable names for the + processes in the table rather than raw pids. The example below + keeps a per-process sum of total bytes read: + + # echo 'hist:key=common_pid.execname:val=count:sort=count.descending' > \ + /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger + + # cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/hist + # trigger info: hist:keys=common_pid.execname:vals=count:sort=count.descending:size=2048 [active] + + { common_pid: gnome-terminal [ 3196] } hitcount: 280 count: 1093512 + { common_pid: Xorg [ 1309] } hitcount: 525 count: 256640 + { common_pid: compiz [ 2889] } hitcount: 59 count: 254400 + { common_pid: bash [ 8710] } hitcount: 3 count: 66369 + { common_pid: dbus-daemon-lau [ 8703] } hitcount: 49 count: 47739 + { common_pid: irqbalance [ 1252] } hitcount: 27 count: 27648 + { common_pid: 01ifupdown [ 8705] } hitcount: 3 count: 17216 + { common_pid: dbus-daemon [ 772] } hitcount: 10 count: 12396 + { common_pid: Socket Thread [ 8342] } hitcount: 11 count: 11264 + { common_pid: nm-dhcp-client. [ 8701] } hitcount: 6 count: 7424 + { common_pid: gmain [ 1315] } hitcount: 18 count: 6336 + . + . + . + { common_pid: postgres [ 1892] } hitcount: 2 count: 32 + { common_pid: postgres [ 1891] } hitcount: 2 count: 32 + { common_pid: gmain [ 8704] } hitcount: 2 count: 32 + { common_pid: upstart-dbus-br [ 2740] } hitcount: 21 count: 21 + { common_pid: nm-dispatcher.a [ 8696] } hitcount: 1 count: 16 + { common_pid: indicator-datet [ 2904] } hitcount: 1 count: 16 + { common_pid: gdbus [ 2998] } hitcount: 1 count: 16 + { common_pid: rtkit-daemon [ 2052] } hitcount: 1 count: 8 + { common_pid: init [ 1] } hitcount: 2 count: 2 + + Totals: + Hits: 2116 + Entries: 51 + Dropped: 0 + + Similarly, if you key a hist trigger on syscall id, for example to + gather and display a list of systemwide syscall hits, you can use + the special .syscall modifier to display the syscall names rather + than raw ids. The example below keeps a running total of syscall + counts for the system during the run: + + # echo 'hist:key=id.syscall:val=hitcount' > \ + /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger + + # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist + # trigger info: hist:keys=id.syscall:vals=hitcount:sort=hitcount:size=2048 [active] + + { id: sys_fsync [ 74] } hitcount: 1 + { id: sys_newuname [ 63] } hitcount: 1 + { id: sys_prctl [157] } hitcount: 1 + { id: sys_statfs [137] } hitcount: 1 + { id: sys_symlink [ 88] } hitcount: 1 + { id: sys_sendmmsg [307] } hitcount: 1 + { id: sys_semctl [ 66] } hitcount: 1 + { id: sys_readlink [ 89] } hitcount: 3 + { id: sys_bind [ 49] } hitcount: 3 + { id: sys_getsockname [ 51] } hitcount: 3 + { id: sys_unlink [ 87] } hitcount: 3 + { id: sys_rename [ 82] } hitcount: 4 + { id: unknown_syscall [ 58] } hitcount: 4 + { id: sys_connect [ 42] } hitcount: 4 + { id: sys_getpid [ 39] } hitcount: 4 + . + . + . + { id: sys_rt_sigprocmask [ 14] } hitcount: 952 + { id: sys_futex [202] } hitcount: 1534 + { id: sys_write [ 1] } hitcount: 2689 + { id: sys_setitimer [ 38] } hitcount: 2797 + { id: sys_read [ 0] } hitcount: 3202 + { id: sys_select [ 23] } hitcount: 3773 + { id: sys_writev [ 20] } hitcount: 4531 + { id: sys_poll [ 7] } hitcount: 8314 + { id: sys_recvmsg [ 47] } hitcount: 13738 + { id: sys_ioctl [ 16] } hitcount: 21843 + + Totals: + Hits: 67612 + Entries: 72 + Dropped: 0 + + The syscall counts above provide a rough overall picture of system + call activity on the system; we can see for example that the most + popular system call on this system was the 'sys_ioctl' system call. + + We can use 'compound' keys to refine that number and provide some + further insight as to which processes exactly contribute to the + overall ioctl count. + + The command below keeps a hitcount for every unique combination of + system call id and pid - the end result is essentially a table + that keeps a per-pid sum of system call hits. The results are + sorted using the system call id as the primary key, and the + hitcount sum as the secondary key: + + # echo 'hist:key=id.syscall,common_pid.execname:val=hitcount:sort=id,hitcount' > \ + /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger + + # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist + # trigger info: hist:keys=id.syscall,common_pid.execname:vals=hitcount:sort=id.syscall,hitcount:size=2048 [active] + + { id: sys_read [ 0], common_pid: rtkit-daemon [ 1877] } hitcount: 1 + { id: sys_read [ 0], common_pid: gdbus [ 2976] } hitcount: 1 + { id: sys_read [ 0], common_pid: console-kit-dae [ 3400] } hitcount: 1 + { id: sys_read [ 0], common_pid: postgres [ 1865] } hitcount: 1 + { id: sys_read [ 0], common_pid: deja-dup-monito [ 3543] } hitcount: 2 + { id: sys_read [ 0], common_pid: NetworkManager [ 890] } hitcount: 2 + { id: sys_read [ 0], common_pid: evolution-calen [ 3048] } hitcount: 2 + { id: sys_read [ 0], common_pid: postgres [ 1864] } hitcount: 2 + { id: sys_read [ 0], common_pid: nm-applet [ 3022] } hitcount: 2 + { id: sys_read [ 0], common_pid: whoopsie [ 1212] } hitcount: 2 + . + . + . + { id: sys_ioctl [ 16], common_pid: bash [ 8479] } hitcount: 1 + { id: sys_ioctl [ 16], common_pid: bash [ 3472] } hitcount: 12 + { id: sys_ioctl [ 16], common_pid: gnome-terminal [ 3199] } hitcount: 16 + { id: sys_ioctl [ 16], common_pid: Xorg [ 1267] } hitcount: 1808 + { id: sys_ioctl [ 16], common_pid: compiz [ 2994] } hitcount: 5580 + . + . + . + { id: sys_waitid [247], common_pid: upstart-dbus-br [ 2690] } hitcount: 3 + { id: sys_waitid [247], common_pid: upstart-dbus-br [ 2688] } hitcount: 16 + { id: sys_inotify_add_watch [254], common_pid: gmain [ 975] } hitcount: 2 + { id: sys_inotify_add_watch [254], common_pid: gmain [ 3204] } hitcount: 4 + { id: sys_inotify_add_watch [254], common_pid: gmain [ 2888] } hitcount: 4 + { id: sys_inotify_add_watch [254], common_pid: gmain [ 3003] } hitcount: 4 + { id: sys_inotify_add_watch [254], common_pid: gmain [ 2873] } hitcount: 4 + { id: sys_inotify_add_watch [254], common_pid: gmain [ 3196] } hitcount: 6 + { id: sys_openat [257], common_pid: java [ 2623] } hitcount: 2 + { id: sys_eventfd2 [290], common_pid: ibus-ui-gtk3 [ 2760] } hitcount: 4 + { id: sys_eventfd2 [290], common_pid: compiz [ 2994] } hitcount: 6 + + Totals: + Hits: 31536 + Entries: 323 + Dropped: 0 + + The above list does give us a breakdown of the ioctl syscall by + pid, but it also gives us quite a bit more than that, which we + don't really care about at the moment. Since we know the syscall + id for sys_ioctl (16, displayed next to the sys_ioctl name), we + can use that to filter out all the other syscalls: + + # echo 'hist:key=id.syscall,common_pid.execname:val=hitcount:sort=id,hitcount if id == 16' > \ + /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger + + # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist + # trigger info: hist:keys=id.syscall,common_pid.execname:vals=hitcount:sort=id.syscall,hitcount:size=2048 if id == 16 [active] + + { id: sys_ioctl [ 16], common_pid: gmain [ 2769] } hitcount: 1 + { id: sys_ioctl [ 16], common_pid: evolution-addre [ 8571] } hitcount: 1 + { id: sys_ioctl [ 16], common_pid: gmain [ 3003] } hitcount: 1 + { id: sys_ioctl [ 16], common_pid: gmain [ 2781] } hitcount: 1 + { id: sys_ioctl [ 16], common_pid: gmain [ 2829] } hitcount: 1 + { id: sys_ioctl [ 16], common_pid: bash [ 8726] } hitcount: 1 + { id: sys_ioctl [ 16], common_pid: bash [ 8508] } hitcount: 1 + { id: sys_ioctl [ 16], common_pid: gmain [ 2970] } hitcount: 1 + { id: sys_ioctl [ 16], common_pid: gmain [ 2768] } hitcount: 1 + . + . + . + { id: sys_ioctl [ 16], common_pid: pool [ 8559] } hitcount: 45 + { id: sys_ioctl [ 16], common_pid: pool [ 8555] } hitcount: 48 + { id: sys_ioctl [ 16], common_pid: pool [ 8551] } hitcount: 48 + { id: sys_ioctl [ 16], common_pid: avahi-daemon [ 896] } hitcount: 66 + { id: sys_ioctl [ 16], common_pid: Xorg [ 1267] } hitcount: 26674 + { id: sys_ioctl [ 16], common_pid: compiz [ 2994] } hitcount: 73443 + + Totals: + Hits: 101162 + Entries: 103 + Dropped: 0 + + The above output shows that 'compiz' and 'Xorg' are far and away + the heaviest ioctl callers (which might lead to questions about + whether they really need to be making all those calls and to + possible avenues for further investigation.) + + The compound key examples used a key and a sum value (hitcount) to + sort the output, but we can just as easily use two keys instead. + Here's an example where we use a compound key composed of the the + common_pid and size event fields. Sorting with pid as the primary + key and 'size' as the secondary key allows us to display an + ordered summary of the recvfrom sizes, with counts, received by + each process: + + # echo 'hist:key=common_pid.execname,size:val=hitcount:sort=common_pid,size' > \ + /sys/kernel/debug/tracing/events/syscalls/sys_enter_recvfrom/trigger + + # cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_recvfrom/hist + # trigger info: hist:keys=common_pid.execname,size:vals=hitcount:sort=common_pid.execname,size:size=2048 [active] + + { common_pid: smbd [ 784], size: 4 } hitcount: 1 + { common_pid: dnsmasq [ 1412], size: 4096 } hitcount: 672 + { common_pid: postgres [ 1796], size: 1000 } hitcount: 6 + { common_pid: postgres [ 1867], size: 1000 } hitcount: 10 + { common_pid: bamfdaemon [ 2787], size: 28 } hitcount: 2 + { common_pid: bamfdaemon [ 2787], size: 14360 } hitcount: 1 + { common_pid: compiz [ 2994], size: 8 } hitcount: 1 + { common_pid: compiz [ 2994], size: 20 } hitcount: 11 + { common_pid: gnome-terminal [ 3199], size: 4 } hitcount: 2 + { common_pid: firefox [ 8817], size: 4 } hitcount: 1 + { common_pid: firefox [ 8817], size: 8 } hitcount: 5 + { common_pid: firefox [ 8817], size: 588 } hitcount: 2 + { common_pid: firefox [ 8817], size: 628 } hitcount: 1 + { common_pid: firefox [ 8817], size: 6944 } hitcount: 1 + { common_pid: firefox [ 8817], size: 408880 } hitcount: 2 + { common_pid: firefox [ 8822], size: 8 } hitcount: 2 + { common_pid: firefox [ 8822], size: 160 } hitcount: 2 + { common_pid: firefox [ 8822], size: 320 } hitcount: 2 + { common_pid: firefox [ 8822], size: 352 } hitcount: 1 + . + . + . + { common_pid: pool [ 8923], size: 1960 } hitcount: 10 + { common_pid: pool [ 8923], size: 2048 } hitcount: 10 + { common_pid: pool [ 8924], size: 1960 } hitcount: 10 + { common_pid: pool [ 8924], size: 2048 } hitcount: 10 + { common_pid: pool [ 8928], size: 1964 } hitcount: 4 + { common_pid: pool [ 8928], size: 1965 } hitcount: 2 + { common_pid: pool [ 8928], size: 2048 } hitcount: 6 + { common_pid: pool [ 8929], size: 1982 } hitcount: 1 + { common_pid: pool [ 8929], size: 2048 } hitcount: 1 + + Totals: + Hits: 2016 + Entries: 224 + Dropped: 0 + + The above example also illustrates the fact that although a compound + key is treated as a single entity for hashing purposes, the sub-keys + it's composed of can be accessed independently. + + The next example uses a string field as the hash key and + demonstrates how you can manually pause and continue a hist trigger. + In this example, we'll aggregate fork counts and don't expect a + large number of entries in the hash table, so we'll drop it to a + much smaller number, say 256: + + # echo 'hist:key=child_comm:val=hitcount:size=256' > \ + /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger + + # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist + # trigger info: hist:keys=child_comm:vals=hitcount:sort=hitcount:size=256 [active] + + { child_comm: dconf worker } hitcount: 1 + { child_comm: ibus-daemon } hitcount: 1 + { child_comm: whoopsie } hitcount: 1 + { child_comm: smbd } hitcount: 1 + { child_comm: gdbus } hitcount: 1 + { child_comm: kthreadd } hitcount: 1 + { child_comm: dconf worker } hitcount: 1 + { child_comm: evolution-alarm } hitcount: 2 + { child_comm: Socket Thread } hitcount: 2 + { child_comm: postgres } hitcount: 2 + { child_comm: bash } hitcount: 3 + { child_comm: compiz } hitcount: 3 + { child_comm: evolution-sourc } hitcount: 4 + { child_comm: dhclient } hitcount: 4 + { child_comm: pool } hitcount: 5 + { child_comm: nm-dispatcher.a } hitcount: 8 + { child_comm: firefox } hitcount: 8 + { child_comm: dbus-daemon } hitcount: 8 + { child_comm: glib-pacrunner } hitcount: 10 + { child_comm: evolution } hitcount: 23 + + Totals: + Hits: 89 + Entries: 20 + Dropped: 0 + + If we want to pause the hist trigger, we can simply append :pause to + the command that started the trigger. Notice that the trigger info + displays as [paused]: + + # echo 'hist:key=child_comm:val=hitcount:size=256:pause' >> \ + /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger + + # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist + # trigger info: hist:keys=child_comm:vals=hitcount:sort=hitcount:size=256 [paused] + + { child_comm: dconf worker } hitcount: 1 + { child_comm: kthreadd } hitcount: 1 + { child_comm: dconf worker } hitcount: 1 + { child_comm: gdbus } hitcount: 1 + { child_comm: ibus-daemon } hitcount: 1 + { child_comm: Socket Thread } hitcount: 2 + { child_comm: evolution-alarm } hitcount: 2 + { child_comm: smbd } hitcount: 2 + { child_comm: bash } hitcount: 3 + { child_comm: whoopsie } hitcount: 3 + { child_comm: compiz } hitcount: 3 + { child_comm: evolution-sourc } hitcount: 4 + { child_comm: pool } hitcount: 5 + { child_comm: postgres } hitcount: 6 + { child_comm: firefox } hitcount: 8 + { child_comm: dhclient } hitcount: 10 + { child_comm: emacs } hitcount: 12 + { child_comm: dbus-daemon } hitcount: 20 + { child_comm: nm-dispatcher.a } hitcount: 20 + { child_comm: evolution } hitcount: 35 + { child_comm: glib-pacrunner } hitcount: 59 + + Totals: + Hits: 199 + Entries: 21 + Dropped: 0 + + To manually continue having the trigger aggregate events, append + :cont instead. Notice that the trigger info displays as [active] + again, and the data has changed: + + # echo 'hist:key=child_comm:val=hitcount:size=256:cont' >> \ + /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger + + # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist + # trigger info: hist:keys=child_comm:vals=hitcount:sort=hitcount:size=256 [active] + + { child_comm: dconf worker } hitcount: 1 + { child_comm: dconf worker } hitcount: 1 + { child_comm: kthreadd } hitcount: 1 + { child_comm: gdbus } hitcount: 1 + { child_comm: ibus-daemon } hitcount: 1 + { child_comm: Socket Thread } hitcount: 2 + { child_comm: evolution-alarm } hitcount: 2 + { child_comm: smbd } hitcount: 2 + { child_comm: whoopsie } hitcount: 3 + { child_comm: compiz } hitcount: 3 + { child_comm: evolution-sourc } hitcount: 4 + { child_comm: bash } hitcount: 5 + { child_comm: pool } hitcount: 5 + { child_comm: postgres } hitcount: 6 + { child_comm: firefox } hitcount: 8 + { child_comm: dhclient } hitcount: 11 + { child_comm: emacs } hitcount: 12 + { child_comm: dbus-daemon } hitcount: 22 + { child_comm: nm-dispatcher.a } hitcount: 22 + { child_comm: evolution } hitcount: 35 + { child_comm: glib-pacrunner } hitcount: 59 + + Totals: + Hits: 206 + Entries: 21 + Dropped: 0 + + The previous example showed how to start and stop a hist trigger by + appending 'pause' and 'continue' to the hist trigger command. A + hist trigger can also be started in a paused state by initially + starting the trigger with ':pause' appended. This allows you to + start the trigger only when you're ready to start collecting data + and not before. For example, you could start the trigger in a + paused state, then unpause it and do something you want to measure, + then pause the trigger again when done. + + Of course, doing this manually can be difficult and error-prone, but + it is possible to automatically start and stop a hist trigger based + on some condition, via the enable_hist and disable_hist triggers. + + For example, suppose we wanted to take a look at the relative + weights in terms of skb length for each callpath that leads to a + netif_receieve_skb event when downloading a decent-sized file using + wget. + + First we set up an initially paused stacktrace trigger on the + netif_receive_skb event: + + # echo 'hist:key=stacktrace:vals=len:pause' > \ + /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger + + Next, we set up an 'enable_hist' trigger on the sched_process_exec + event, with an 'if filename==/usr/bin/wget' filter. The effect of + this new trigger is that it will 'unpause' the hist trigger we just + set up on netif_receive_skb if and only if it sees a + sched_process_exec event with a filename of '/usr/bin/wget'. When + that happens, all netif_receive_skb events are aggregated into a + hash table keyed on stacktrace: + + # echo 'enable_hist:net:netif_receive_skb if filename==/usr/bin/wget' > \ + /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger + + The aggregation continues until the netif_receive_skb is paused + again, which is what the following disable_hist event does by + creating a similar setup on the sched_process_exit event, using the + filter 'comm==wget': + + # echo 'disable_hist:net:netif_receive_skb if comm==wget' > \ + /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger + + Whenever a process exits and the comm field of the disable_hist + trigger filter matches 'comm==wget', the netif_receive_skb hist + trigger is disabled. + + The overall effect is that netif_receive_skb events are aggregated + into the hash table for only the duration of the wget. Executing a + wget command and then listing the 'hist' file will display the + output generated by the wget command: + + $ wget https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.19.xz + + # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist + # trigger info: hist:keys=stacktrace:vals=len:sort=hitcount:size=2048 [paused] + + { stacktrace: + __netif_receive_skb_core+0x46d/0x990 + __netif_receive_skb+0x18/0x60 + netif_receive_skb_internal+0x23/0x90 + napi_gro_receive+0xc8/0x100 + ieee80211_deliver_skb+0xd6/0x270 [mac80211] + ieee80211_rx_handlers+0xccf/0x22f0 [mac80211] + ieee80211_prepare_and_rx_handle+0x4e7/0xc40 [mac80211] + ieee80211_rx+0x31d/0x900 [mac80211] + iwlagn_rx_reply_rx+0x3db/0x6f0 [iwldvm] + iwl_rx_dispatch+0x8e/0xf0 [iwldvm] + iwl_pcie_irq_handler+0xe3c/0x12f0 [iwlwifi] + irq_thread_fn+0x20/0x50 + irq_thread+0x11f/0x150 + kthread+0xd2/0xf0 + ret_from_fork+0x42/0x70 + } hitcount: 85 len: 28884 + { stacktrace: + __netif_receive_skb_core+0x46d/0x990 + __netif_receive_skb+0x18/0x60 + netif_receive_skb_internal+0x23/0x90 + napi_gro_complete+0xa4/0xe0 + dev_gro_receive+0x23a/0x360 + napi_gro_receive+0x30/0x100 + ieee80211_deliver_skb+0xd6/0x270 [mac80211] + ieee80211_rx_handlers+0xccf/0x22f0 [mac80211] + ieee80211_prepare_and_rx_handle+0x4e7/0xc40 [mac80211] + ieee80211_rx+0x31d/0x900 [mac80211] + iwlagn_rx_reply_rx+0x3db/0x6f0 [iwldvm] + iwl_rx_dispatch+0x8e/0xf0 [iwldvm] + iwl_pcie_irq_handler+0xe3c/0x12f0 [iwlwifi] + irq_thread_fn+0x20/0x50 + irq_thread+0x11f/0x150 + kthread+0xd2/0xf0 + } hitcount: 98 len: 664329 + { stacktrace: + __netif_receive_skb_core+0x46d/0x990 + __netif_receive_skb+0x18/0x60 + process_backlog+0xa8/0x150 + net_rx_action+0x15d/0x340 + __do_softirq+0x114/0x2c0 + do_softirq_own_stack+0x1c/0x30 + do_softirq+0x65/0x70 + __local_bh_enable_ip+0xb5/0xc0 + ip_finish_output+0x1f4/0x840 + ip_output+0x6b/0xc0 + ip_local_out_sk+0x31/0x40 + ip_send_skb+0x1a/0x50 + udp_send_skb+0x173/0x2a0 + udp_sendmsg+0x2bf/0x9f0 + inet_sendmsg+0x64/0xa0 + sock_sendmsg+0x3d/0x50 + } hitcount: 115 len: 13030 + { stacktrace: + __netif_receive_skb_core+0x46d/0x990 + __netif_receive_skb+0x18/0x60 + netif_receive_skb_internal+0x23/0x90 + napi_gro_complete+0xa4/0xe0 + napi_gro_flush+0x6d/0x90 + iwl_pcie_irq_handler+0x92a/0x12f0 [iwlwifi] + irq_thread_fn+0x20/0x50 + irq_thread+0x11f/0x150 + kthread+0xd2/0xf0 + ret_from_fork+0x42/0x70 + } hitcount: 934 len: 5512212 + + Totals: + Hits: 1232 + Entries: 4 + Dropped: 0 + + The above shows all the netif_receive_skb callpaths and their total + lengths for the duration of the wget command. + + The 'clear' hist trigger param can be used to clear the hash table. + Suppose we wanted to try another run of the previous example but + this time also wanted to see the complete list of events that went + into the histogram. In order to avoid having to set everything up + again, we can just clear the histogram first: + + # echo 'hist:key=stacktrace:vals=len:clear' >> \ + /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger + + Just to verify that it is in fact cleared, here's what we now see in + the hist file: + + # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist + # trigger info: hist:keys=stacktrace:vals=len:sort=hitcount:size=2048 [paused] + + Totals: + Hits: 0 + Entries: 0 + Dropped: 0 + + Since we want to see the detailed list of every netif_receive_skb + event occurring during the new run, which are in fact the same + events being aggregated into the hash table, we add some additional + 'enable_event' events to the triggering sched_process_exec and + sched_process_exit events as such: + + # echo 'enable_event:net:netif_receive_skb if filename==/usr/bin/wget' > \ + /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger + + # echo 'disable_event:net:netif_receive_skb if comm==wget' > \ + /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger + + If you read the trigger files for the sched_process_exec and + sched_process_exit triggers, you should see two triggers for each: + one enabling/disabling the hist aggregation and the other + enabling/disabling the logging of events: + + # cat /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger + enable_event:net:netif_receive_skb:unlimited if filename==/usr/bin/wget + enable_hist:net:netif_receive_skb:unlimited if filename==/usr/bin/wget + + # cat /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger + enable_event:net:netif_receive_skb:unlimited if comm==wget + disable_hist:net:netif_receive_skb:unlimited if comm==wget + + In other words, whenever either of the sched_process_exec or + sched_process_exit events is hit and matches 'wget', it enables or + disables both the histogram and the event log, and what you end up + with is a hash table and set of events just covering the specified + duration. Run the wget command again: + + $ wget https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.19.xz + + Displaying the 'hist' file should show something similar to what you + saw in the last run, but this time you should also see the + individual events in the trace file: + + # cat /sys/kernel/debug/tracing/trace + + # tracer: nop + # + # entries-in-buffer/entries-written: 183/1426 #P:4 + # + # _-----=> irqs-off + # / _----=> need-resched + # | / _---=> hardirq/softirq + # || / _--=> preempt-depth + # ||| / delay + # TASK-PID CPU# |||| TIMESTAMP FUNCTION + # | | | |||| | | + wget-15108 [000] ..s1 31769.606929: netif_receive_skb: dev=lo skbaddr=ffff88009c353100 len=60 + wget-15108 [000] ..s1 31769.606999: netif_receive_skb: dev=lo skbaddr=ffff88009c353200 len=60 + dnsmasq-1382 [000] ..s1 31769.677652: netif_receive_skb: dev=lo skbaddr=ffff88009c352b00 len=130 + dnsmasq-1382 [000] ..s1 31769.685917: netif_receive_skb: dev=lo skbaddr=ffff88009c352200 len=138 + ##### CPU 2 buffer started #### + irq/29-iwlwifi-559 [002] ..s. 31772.031529: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d433d00 len=2948 + irq/29-iwlwifi-559 [002] ..s. 31772.031572: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d432200 len=1500 + irq/29-iwlwifi-559 [002] ..s. 31772.032196: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d433100 len=2948 + irq/29-iwlwifi-559 [002] ..s. 31772.032761: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d433000 len=2948 + irq/29-iwlwifi-559 [002] ..s. 31772.033220: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d432e00 len=1500 + . + . + . + + The following example demonstrates how multiple hist triggers can be + attached to a given event. This capability can be useful for + creating a set of different summaries derived from the same set of + events, or for comparing the effects of different filters, among + other things. + + # echo 'hist:keys=skbaddr.hex:vals=len if len < 0' >> \ + /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger + # echo 'hist:keys=skbaddr.hex:vals=len if len > 4096' >> \ + /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger + # echo 'hist:keys=skbaddr.hex:vals=len if len == 256' >> \ + /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger + # echo 'hist:keys=skbaddr.hex:vals=len' >> \ + /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger + # echo 'hist:keys=len:vals=common_preempt_count' >> \ + /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger + + The above set of commands create four triggers differing only in + their filters, along with a completely different though fairly + nonsensical trigger. Note that in order to append multiple hist + triggers to the same file, you should use the '>>' operator to + append them ('>' will also add the new hist trigger, but will remove + any existing hist triggers beforehand). + + Displaying the contents of the 'hist' file for the event shows the + contents of all five histograms: + + # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist + + # event histogram + # + # trigger info: hist:keys=len:vals=hitcount,common_preempt_count:sort=hitcount:size=2048 [active] + # + + { len: 176 } hitcount: 1 common_preempt_count: 0 + { len: 223 } hitcount: 1 common_preempt_count: 0 + { len: 4854 } hitcount: 1 common_preempt_count: 0 + { len: 395 } hitcount: 1 common_preempt_count: 0 + { len: 177 } hitcount: 1 common_preempt_count: 0 + { len: 446 } hitcount: 1 common_preempt_count: 0 + { len: 1601 } hitcount: 1 common_preempt_count: 0 + . + . + . + { len: 1280 } hitcount: 66 common_preempt_count: 0 + { len: 116 } hitcount: 81 common_preempt_count: 40 + { len: 708 } hitcount: 112 common_preempt_count: 0 + { len: 46 } hitcount: 221 common_preempt_count: 0 + { len: 1264 } hitcount: 458 common_preempt_count: 0 + + Totals: + Hits: 1428 + Entries: 147 + Dropped: 0 + + + # event histogram + # + # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active] + # + + { skbaddr: ffff8800baee5e00 } hitcount: 1 len: 130 + { skbaddr: ffff88005f3d5600 } hitcount: 1 len: 1280 + { skbaddr: ffff88005f3d4900 } hitcount: 1 len: 1280 + { skbaddr: ffff88009fed6300 } hitcount: 1 len: 115 + { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 115 + { skbaddr: ffff88008cdb1900 } hitcount: 1 len: 46 + { skbaddr: ffff880064b5ef00 } hitcount: 1 len: 118 + { skbaddr: ffff880044e3c700 } hitcount: 1 len: 60 + { skbaddr: ffff880100065900 } hitcount: 1 len: 46 + { skbaddr: ffff8800d46bd500 } hitcount: 1 len: 116 + { skbaddr: ffff88005f3d5f00 } hitcount: 1 len: 1280 + { skbaddr: ffff880100064700 } hitcount: 1 len: 365 + { skbaddr: ffff8800badb6f00 } hitcount: 1 len: 60 + . + . + . + { skbaddr: ffff88009fe0be00 } hitcount: 27 len: 24677 + { skbaddr: ffff88009fe0a400 } hitcount: 27 len: 23052 + { skbaddr: ffff88009fe0b700 } hitcount: 31 len: 25589 + { skbaddr: ffff88009fe0b600 } hitcount: 32 len: 27326 + { skbaddr: ffff88006a462800 } hitcount: 68 len: 71678 + { skbaddr: ffff88006a463700 } hitcount: 70 len: 72678 + { skbaddr: ffff88006a462b00 } hitcount: 71 len: 77589 + { skbaddr: ffff88006a463600 } hitcount: 73 len: 71307 + { skbaddr: ffff88006a462200 } hitcount: 81 len: 81032 + + Totals: + Hits: 1451 + Entries: 318 + Dropped: 0 + + + # event histogram + # + # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 if len == 256 [active] + # + + + Totals: + Hits: 0 + Entries: 0 + Dropped: 0 + + + # event histogram + # + # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 if len > 4096 [active] + # + + { skbaddr: ffff88009fd2c300 } hitcount: 1 len: 7212 + { skbaddr: ffff8800d2bcce00 } hitcount: 1 len: 7212 + { skbaddr: ffff8800d2bcd700 } hitcount: 1 len: 7212 + { skbaddr: ffff8800d2bcda00 } hitcount: 1 len: 21492 + { skbaddr: ffff8800ae2e2d00 } hitcount: 1 len: 7212 + { skbaddr: ffff8800d2bcdb00 } hitcount: 1 len: 7212 + { skbaddr: ffff88006a4df500 } hitcount: 1 len: 4854 + { skbaddr: ffff88008ce47b00 } hitcount: 1 len: 18636 + { skbaddr: ffff8800ae2e2200 } hitcount: 1 len: 12924 + { skbaddr: ffff88005f3e1000 } hitcount: 1 len: 4356 + { skbaddr: ffff8800d2bcdc00 } hitcount: 2 len: 24420 + { skbaddr: ffff8800d2bcc200 } hitcount: 2 len: 12996 + + Totals: + Hits: 14 + Entries: 12 + Dropped: 0 + + + # event histogram + # + # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 if len < 0 [active] + # + + + Totals: + Hits: 0 + Entries: 0 + Dropped: 0 + + Named triggers can be used to have triggers share a common set of + histogram data. This capability is mostly useful for combining the + output of events generated by tracepoints contained inside inline + functions, but names can be used in a hist trigger on any event. + For example, these two triggers when hit will update the same 'len' + field in the shared 'foo' histogram data: + + # echo 'hist:name=foo:keys=skbaddr.hex:vals=len' > \ + /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger + # echo 'hist:name=foo:keys=skbaddr.hex:vals=len' > \ + /sys/kernel/debug/tracing/events/net/netif_rx/trigger + + You can see that they're updating common histogram data by reading + each event's hist files at the same time: + + # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist; + cat /sys/kernel/debug/tracing/events/net/netif_rx/hist + + # event histogram + # + # trigger info: hist:name=foo:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active] + # + + { skbaddr: ffff88000ad53500 } hitcount: 1 len: 46 + { skbaddr: ffff8800af5a1500 } hitcount: 1 len: 76 + { skbaddr: ffff8800d62a1900 } hitcount: 1 len: 46 + { skbaddr: ffff8800d2bccb00 } hitcount: 1 len: 468 + { skbaddr: ffff8800d3c69900 } hitcount: 1 len: 46 + { skbaddr: ffff88009ff09100 } hitcount: 1 len: 52 + { skbaddr: ffff88010f13ab00 } hitcount: 1 len: 168 + { skbaddr: ffff88006a54f400 } hitcount: 1 len: 46 + { skbaddr: ffff8800d2bcc500 } hitcount: 1 len: 260 + { skbaddr: ffff880064505000 } hitcount: 1 len: 46 + { skbaddr: ffff8800baf24e00 } hitcount: 1 len: 32 + { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 46 + { skbaddr: ffff8800d3edff00 } hitcount: 1 len: 44 + { skbaddr: ffff88009fe0b400 } hitcount: 1 len: 168 + { skbaddr: ffff8800a1c55a00 } hitcount: 1 len: 40 + { skbaddr: ffff8800d2bcd100 } hitcount: 1 len: 40 + { skbaddr: ffff880064505f00 } hitcount: 1 len: 174 + { skbaddr: ffff8800a8bff200 } hitcount: 1 len: 160 + { skbaddr: ffff880044e3cc00 } hitcount: 1 len: 76 + { skbaddr: ffff8800a8bfe700 } hitcount: 1 len: 46 + { skbaddr: ffff8800d2bcdc00 } hitcount: 1 len: 32 + { skbaddr: ffff8800a1f64800 } hitcount: 1 len: 46 + { skbaddr: ffff8800d2bcde00 } hitcount: 1 len: 988 + { skbaddr: ffff88006a5dea00 } hitcount: 1 len: 46 + { skbaddr: ffff88002e37a200 } hitcount: 1 len: 44 + { skbaddr: ffff8800a1f32c00 } hitcount: 2 len: 676 + { skbaddr: ffff88000ad52600 } hitcount: 2 len: 107 + { skbaddr: ffff8800a1f91e00 } hitcount: 2 len: 92 + { skbaddr: ffff8800af5a0200 } hitcount: 2 len: 142 + { skbaddr: ffff8800d2bcc600 } hitcount: 2 len: 220 + { skbaddr: ffff8800ba36f500 } hitcount: 2 len: 92 + { skbaddr: ffff8800d021f800 } hitcount: 2 len: 92 + { skbaddr: ffff8800a1f33600 } hitcount: 2 len: 675 + { skbaddr: ffff8800a8bfff00 } hitcount: 3 len: 138 + { skbaddr: ffff8800d62a1300 } hitcount: 3 len: 138 + { skbaddr: ffff88002e37a100 } hitcount: 4 len: 184 + { skbaddr: ffff880064504400 } hitcount: 4 len: 184 + { skbaddr: ffff8800a8bfec00 } hitcount: 4 len: 184 + { skbaddr: ffff88000ad53700 } hitcount: 5 len: 230 + { skbaddr: ffff8800d2bcdb00 } hitcount: 5 len: 196 + { skbaddr: ffff8800a1f90000 } hitcount: 6 len: 276 + { skbaddr: ffff88006a54f900 } hitcount: 6 len: 276 + + Totals: + Hits: 81 + Entries: 42 + Dropped: 0 + # event histogram + # + # trigger info: hist:name=foo:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active] + # + + { skbaddr: ffff88000ad53500 } hitcount: 1 len: 46 + { skbaddr: ffff8800af5a1500 } hitcount: 1 len: 76 + { skbaddr: ffff8800d62a1900 } hitcount: 1 len: 46 + { skbaddr: ffff8800d2bccb00 } hitcount: 1 len: 468 + { skbaddr: ffff8800d3c69900 } hitcount: 1 len: 46 + { skbaddr: ffff88009ff09100 } hitcount: 1 len: 52 + { skbaddr: ffff88010f13ab00 } hitcount: 1 len: 168 + { skbaddr: ffff88006a54f400 } hitcount: 1 len: 46 + { skbaddr: ffff8800d2bcc500 } hitcount: 1 len: 260 + { skbaddr: ffff880064505000 } hitcount: 1 len: 46 + { skbaddr: ffff8800baf24e00 } hitcount: 1 len: 32 + { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 46 + { skbaddr: ffff8800d3edff00 } hitcount: 1 len: 44 + { skbaddr: ffff88009fe0b400 } hitcount: 1 len: 168 + { skbaddr: ffff8800a1c55a00 } hitcount: 1 len: 40 + { skbaddr: ffff8800d2bcd100 } hitcount: 1 len: 40 + { skbaddr: ffff880064505f00 } hitcount: 1 len: 174 + { skbaddr: ffff8800a8bff200 } hitcount: 1 len: 160 + { skbaddr: ffff880044e3cc00 } hitcount: 1 len: 76 + { skbaddr: ffff8800a8bfe700 } hitcount: 1 len: 46 + { skbaddr: ffff8800d2bcdc00 } hitcount: 1 len: 32 + { skbaddr: ffff8800a1f64800 } hitcount: 1 len: 46 + { skbaddr: ffff8800d2bcde00 } hitcount: 1 len: 988 + { skbaddr: ffff88006a5dea00 } hitcount: 1 len: 46 + { skbaddr: ffff88002e37a200 } hitcount: 1 len: 44 + { skbaddr: ffff8800a1f32c00 } hitcount: 2 len: 676 + { skbaddr: ffff88000ad52600 } hitcount: 2 len: 107 + { skbaddr: ffff8800a1f91e00 } hitcount: 2 len: 92 + { skbaddr: ffff8800af5a0200 } hitcount: 2 len: 142 + { skbaddr: ffff8800d2bcc600 } hitcount: 2 len: 220 + { skbaddr: ffff8800ba36f500 } hitcount: 2 len: 92 + { skbaddr: ffff8800d021f800 } hitcount: 2 len: 92 + { skbaddr: ffff8800a1f33600 } hitcount: 2 len: 675 + { skbaddr: ffff8800a8bfff00 } hitcount: 3 len: 138 + { skbaddr: ffff8800d62a1300 } hitcount: 3 len: 138 + { skbaddr: ffff88002e37a100 } hitcount: 4 len: 184 + { skbaddr: ffff880064504400 } hitcount: 4 len: 184 + { skbaddr: ffff8800a8bfec00 } hitcount: 4 len: 184 + { skbaddr: ffff88000ad53700 } hitcount: 5 len: 230 + { skbaddr: ffff8800d2bcdb00 } hitcount: 5 len: 196 + { skbaddr: ffff8800a1f90000 } hitcount: 6 len: 276 + { skbaddr: ffff88006a54f900 } hitcount: 6 len: 276 + + Totals: + Hits: 81 + Entries: 42 + Dropped: 0 + + And here's an example that shows how to combine histogram data from + any two events even if they don't share any 'compatible' fields + other than 'hitcount' and 'stacktrace'. These commands create a + couple of triggers named 'bar' using those fields: + + # echo 'hist:name=bar:key=stacktrace:val=hitcount' > \ + /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger + # echo 'hist:name=bar:key=stacktrace:val=hitcount' > \ + /sys/kernel/debug/tracing/events/net/netif_rx/trigger + + And displaying the output of either shows some interesting if + somewhat confusing output: + + # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist + # cat /sys/kernel/debug/tracing/events/net/netif_rx/hist + + # event histogram + # + # trigger info: hist:name=bar:keys=stacktrace:vals=hitcount:sort=hitcount:size=2048 [active] + # + + { stacktrace: + _do_fork+0x18e/0x330 + kernel_thread+0x29/0x30 + kthreadd+0x154/0x1b0 + ret_from_fork+0x3f/0x70 + } hitcount: 1 + { stacktrace: + netif_rx_internal+0xb2/0xd0 + netif_rx_ni+0x20/0x70 + dev_loopback_xmit+0xaa/0xd0 + ip_mc_output+0x126/0x240 + ip_local_out_sk+0x31/0x40 + igmp_send_report+0x1e9/0x230 + igmp_timer_expire+0xe9/0x120 + call_timer_fn+0x39/0xf0 + run_timer_softirq+0x1e1/0x290 + __do_softirq+0xfd/0x290 + irq_exit+0x98/0xb0 + smp_apic_timer_interrupt+0x4a/0x60 + apic_timer_interrupt+0x6d/0x80 + cpuidle_enter+0x17/0x20 + call_cpuidle+0x3b/0x60 + cpu_startup_entry+0x22d/0x310 + } hitcount: 1 + { stacktrace: + netif_rx_internal+0xb2/0xd0 + netif_rx_ni+0x20/0x70 + dev_loopback_xmit+0xaa/0xd0 + ip_mc_output+0x17f/0x240 + ip_local_out_sk+0x31/0x40 + ip_send_skb+0x1a/0x50 + udp_send_skb+0x13e/0x270 + udp_sendmsg+0x2bf/0x980 + inet_sendmsg+0x67/0xa0 + sock_sendmsg+0x38/0x50 + SYSC_sendto+0xef/0x170 + SyS_sendto+0xe/0x10 + entry_SYSCALL_64_fastpath+0x12/0x6a + } hitcount: 2 + { stacktrace: + netif_rx_internal+0xb2/0xd0 + netif_rx+0x1c/0x60 + loopback_xmit+0x6c/0xb0 + dev_hard_start_xmit+0x219/0x3a0 + __dev_queue_xmit+0x415/0x4f0 + dev_queue_xmit_sk+0x13/0x20 + ip_finish_output2+0x237/0x340 + ip_finish_output+0x113/0x1d0 + ip_output+0x66/0xc0 + ip_local_out_sk+0x31/0x40 + ip_send_skb+0x1a/0x50 + udp_send_skb+0x16d/0x270 + udp_sendmsg+0x2bf/0x980 + inet_sendmsg+0x67/0xa0 + sock_sendmsg+0x38/0x50 + ___sys_sendmsg+0x14e/0x270 + } hitcount: 76 + { stacktrace: + netif_rx_internal+0xb2/0xd0 + netif_rx+0x1c/0x60 + loopback_xmit+0x6c/0xb0 + dev_hard_start_xmit+0x219/0x3a0 + __dev_queue_xmit+0x415/0x4f0 + dev_queue_xmit_sk+0x13/0x20 + ip_finish_output2+0x237/0x340 + ip_finish_output+0x113/0x1d0 + ip_output+0x66/0xc0 + ip_local_out_sk+0x31/0x40 + ip_send_skb+0x1a/0x50 + udp_send_skb+0x16d/0x270 + udp_sendmsg+0x2bf/0x980 + inet_sendmsg+0x67/0xa0 + sock_sendmsg+0x38/0x50 + ___sys_sendmsg+0x269/0x270 + } hitcount: 77 + { stacktrace: + netif_rx_internal+0xb2/0xd0 + netif_rx+0x1c/0x60 + loopback_xmit+0x6c/0xb0 + dev_hard_start_xmit+0x219/0x3a0 + __dev_queue_xmit+0x415/0x4f0 + dev_queue_xmit_sk+0x13/0x20 + ip_finish_output2+0x237/0x340 + ip_finish_output+0x113/0x1d0 + ip_output+0x66/0xc0 + ip_local_out_sk+0x31/0x40 + ip_send_skb+0x1a/0x50 + udp_send_skb+0x16d/0x270 + udp_sendmsg+0x2bf/0x980 + inet_sendmsg+0x67/0xa0 + sock_sendmsg+0x38/0x50 + SYSC_sendto+0xef/0x170 + } hitcount: 88 + { stacktrace: + _do_fork+0x18e/0x330 + SyS_clone+0x19/0x20 + entry_SYSCALL_64_fastpath+0x12/0x6a + } hitcount: 244 + + Totals: + Hits: 489 + Entries: 7 + Dropped: 0 + + +2.2 Inter-event hist triggers +----------------------------- + +Inter-event hist triggers are hist triggers that combine values from +one or more other events and create a histogram using that data. Data +from an inter-event histogram can in turn become the source for +further combined histograms, thus providing a chain of related +histograms, which is important for some applications. + +The most important example of an inter-event quantity that can be used +in this manner is latency, which is simply a difference in timestamps +between two events. Although latency is the most important +inter-event quantity, note that because the support is completely +general across the trace event subsystem, any event field can be used +in an inter-event quantity. + +An example of a histogram that combines data from other histograms +into a useful chain would be a 'wakeupswitch latency' histogram that +combines a 'wakeup latency' histogram and a 'switch latency' +histogram. + +Normally, a hist trigger specification consists of a (possibly +compound) key along with one or more numeric values, which are +continually updated sums associated with that key. A histogram +specification in this case consists of individual key and value +specifications that refer to trace event fields associated with a +single event type. + +The inter-event hist trigger extension allows fields from multiple +events to be referenced and combined into a multi-event histogram +specification. In support of this overall goal, a few enabling +features have been added to the hist trigger support: + + - In order to compute an inter-event quantity, a value from one + event needs to saved and then referenced from another event. This + requires the introduction of support for histogram 'variables'. + + - The computation of inter-event quantities and their combination + require some minimal amount of support for applying simple + expressions to variables (+ and -). + + - A histogram consisting of inter-event quantities isn't logically a + histogram on either event (so having the 'hist' file for either + event host the histogram output doesn't really make sense). To + address the idea that the histogram is associated with a + combination of events, support is added allowing the creation of + 'synthetic' events that are events derived from other events. + These synthetic events are full-fledged events just like any other + and can be used as such, as for instance to create the + 'combination' histograms mentioned previously. + + - A set of 'actions' can be associated with histogram entries - + these can be used to generate the previously mentioned synthetic + events, but can also be used for other purposes, such as for + example saving context when a 'max' latency has been hit. + + - Trace events don't have a 'timestamp' associated with them, but + there is an implicit timestamp saved along with an event in the + underlying ftrace ring buffer. This timestamp is now exposed as a + a synthetic field named 'common_timestamp' which can be used in + histograms as if it were any other event field; it isn't an actual + field in the trace format but rather is a synthesized value that + nonetheless can be used as if it were an actual field. By default + it is in units of nanoseconds; appending '.usecs' to a + common_timestamp field changes the units to microseconds. + +A note on inter-event timestamps: If common_timestamp is used in a +histogram, the trace buffer is automatically switched over to using +absolute timestamps and the "global" trace clock, in order to avoid +bogus timestamp differences with other clocks that aren't coherent +across CPUs. This can be overridden by specifying one of the other +trace clocks instead, using the "clock=XXX" hist trigger attribute, +where XXX is any of the clocks listed in the tracing/trace_clock +pseudo-file. + +These features are described in more detail in the following sections. + +2.2.1 Histogram Variables +------------------------- + +Variables are simply named locations used for saving and retrieving +values between matching events. A 'matching' event is defined as an +event that has a matching key - if a variable is saved for a histogram +entry corresponding to that key, any subsequent event with a matching +key can access that variable. + +A variable's value is normally available to any subsequent event until +it is set to something else by a subsequent event. The one exception +to that rule is that any variable used in an expression is essentially +'read-once' - once it's used by an expression in a subsequent event, +it's reset to its 'unset' state, which means it can't be used again +unless it's set again. This ensures not only that an event doesn't +use an uninitialized variable in a calculation, but that that variable +is used only once and not for any unrelated subsequent match. + +The basic syntax for saving a variable is to simply prefix a unique +variable name not corresponding to any keyword along with an '=' sign +to any event field. + +Either keys or values can be saved and retrieved in this way. This +creates a variable named 'ts0' for a histogram entry with the key +'next_pid': + + # echo 'hist:keys=next_pid:vals=$ts0:ts0=common_timestamp ... >> \ + event/trigger + +The ts0 variable can be accessed by any subsequent event having the +same pid as 'next_pid'. + +Variable references are formed by prepending the variable name with +the '$' sign. Thus for example, the ts0 variable above would be +referenced as '$ts0' in expressions. + +Because 'vals=' is used, the common_timestamp variable value above +will also be summed as a normal histogram value would (though for a +timestamp it makes little sense). + +The below shows that a key value can also be saved in the same way: + + # echo 'hist:timer_pid=common_pid:key=timer_pid ...' >> event/trigger + +If a variable isn't a key variable or prefixed with 'vals=', the +associated event field will be saved in a variable but won't be summed +as a value: + + # echo 'hist:keys=next_pid:ts1=common_timestamp ... >> event/trigger + +Multiple variables can be assigned at the same time. The below would +result in both ts0 and b being created as variables, with both +common_timestamp and field1 additionally being summed as values: + + # echo 'hist:keys=pid:vals=$ts0,$b:ts0=common_timestamp,b=field1 ... >> \ + event/trigger + +Note that variable assignments can appear either preceding or +following their use. The command below behaves identically to the +command above: + + # echo 'hist:keys=pid:ts0=common_timestamp,b=field1:vals=$ts0,$b ... >> \ + event/trigger + +Any number of variables not bound to a 'vals=' prefix can also be +assigned by simply separating them with colons. Below is the same +thing but without the values being summed in the histogram: + + # echo 'hist:keys=pid:ts0=common_timestamp:b=field1 ... >> event/trigger + +Variables set as above can be referenced and used in expressions on +another event. + +For example, here's how a latency can be calculated: + + # echo 'hist:keys=pid,prio:ts0=common_timestamp ... >> event1/trigger + # echo 'hist:keys=next_pid:wakeup_lat=common_timestamp-$ts0 ... >> event2/trigger + +In the first line above, the event's timetamp is saved into the +variable ts0. In the next line, ts0 is subtracted from the second +event's timestamp to produce the latency, which is then assigned into +yet another variable, 'wakeup_lat'. The hist trigger below in turn +makes use of the wakeup_lat variable to compute a combined latency +using the same key and variable from yet another event: + + # echo 'hist:key=pid:wakeupswitch_lat=$wakeup_lat+$switchtime_lat ... >> event3/trigger + +2.2.2 Synthetic Events +---------------------- + +Synthetic events are user-defined events generated from hist trigger +variables or fields associated with one or more other events. Their +purpose is to provide a mechanism for displaying data spanning +multiple events consistent with the existing and already familiar +usage for normal events. + +To define a synthetic event, the user writes a simple specification +consisting of the name of the new event along with one or more +variables and their types, which can be any valid field type, +separated by semicolons, to the tracing/synthetic_events file. + +For instance, the following creates a new event named 'wakeup_latency' +with 3 fields: lat, pid, and prio. Each of those fields is simply a +variable reference to a variable on another event: + + # echo 'wakeup_latency \ + u64 lat; \ + pid_t pid; \ + int prio' >> \ + /sys/kernel/debug/tracing/synthetic_events + +Reading the tracing/synthetic_events file lists all the currently +defined synthetic events, in this case the event defined above: + + # cat /sys/kernel/debug/tracing/synthetic_events + wakeup_latency u64 lat; pid_t pid; int prio + +An existing synthetic event definition can be removed by prepending +the command that defined it with a '!': + + # echo '!wakeup_latency u64 lat pid_t pid int prio' >> \ + /sys/kernel/debug/tracing/synthetic_events + +At this point, there isn't yet an actual 'wakeup_latency' event +instantiated in the event subsytem - for this to happen, a 'hist +trigger action' needs to be instantiated and bound to actual fields +and variables defined on other events (see Section 6.3.3 below). + +Once that is done, an event instance is created, and a histogram can +be defined using it: + + # echo 'hist:keys=pid,prio,lat.log2:sort=pid,lat' >> \ + /sys/kernel/debug/tracing/events/synthetic/wakeup_latency/trigger + +The new event is created under the tracing/events/synthetic/ directory +and looks and behaves just like any other event: + + # ls /sys/kernel/debug/tracing/events/synthetic/wakeup_latency + enable filter format hist id trigger + +Like any other event, once a histogram is enabled for the event, the +output can be displayed by reading the event's 'hist' file. + +2.2.3 Hist trigger 'actions' +---------------------------- + +A hist trigger 'action' is a function that's executed whenever a +histogram entry is added or updated. + +The default 'action' if no special function is explicity specified is +as it always has been, to simply update the set of values associated +with an entry. Some applications, however, may want to perform +additional actions at that point, such as generate another event, or +compare and save a maximum. + +The following additional actions are available. To specify an action +for a given event, simply specify the action between colons in the +hist trigger specification. + + - onmatch(matching.event).(param list) + + The 'onmatch(matching.event).(params)' hist + trigger action is invoked whenever an event matches and the + histogram entry would be added or updated. It causes the named + synthetic event to be generated with the values given in the + 'param list'. The result is the generation of a synthetic event + that consists of the values contained in those variables at the + time the invoking event was hit. + + The 'param list' consists of one or more parameters which may be + either variables or fields defined on either the 'matching.event' + or the target event. The variables or fields specified in the + param list may be either fully-qualified or unqualified. If a + variable is specified as unqualified, it must be unique between + the two events. A field name used as a param can be unqualified + if it refers to the target event, but must be fully qualified if + it refers to the matching event. A fully-qualified name is of the + form 'system.event_name.$var_name' or 'system.event_name.field'. + + The 'matching.event' specification is simply the fully qualified + event name of the event that matches the target event for the + onmatch() functionality, in the form 'system.event_name'. + + Finally, the number and type of variables/fields in the 'param + list' must match the number and types of the fields in the + synthetic event being generated. + + As an example the below defines a simple synthetic event and uses + a variable defined on the sched_wakeup_new event as a parameter + when invoking the synthetic event. Here we define the synthetic + event: + + # echo 'wakeup_new_test pid_t pid' >> \ + /sys/kernel/debug/tracing/synthetic_events + + # cat /sys/kernel/debug/tracing/synthetic_events + wakeup_new_test pid_t pid + + The following hist trigger both defines the missing testpid + variable and specifies an onmatch() action that generates a + wakeup_new_test synthetic event whenever a sched_wakeup_new event + occurs, which because of the 'if comm == "cyclictest"' filter only + happens when the executable is cyclictest: + + # echo 'hist:keys=$testpid:testpid=pid:onmatch(sched.sched_wakeup_new).\ + wakeup_new_test($testpid) if comm=="cyclictest"' >> \ + /sys/kernel/debug/tracing/events/sched/sched_wakeup_new/trigger + + Creating and displaying a histogram based on those events is now + just a matter of using the fields and new synthetic event in the + tracing/events/synthetic directory, as usual: + + # echo 'hist:keys=pid:sort=pid' >> \ + /sys/kernel/debug/tracing/events/synthetic/wakeup_new_test/trigger + + Running 'cyclictest' should cause wakeup_new events to generate + wakeup_new_test synthetic events which should result in histogram + output in the wakeup_new_test event's hist file: + + # cat /sys/kernel/debug/tracing/events/synthetic/wakeup_new_test/hist + + A more typical usage would be to use two events to calculate a + latency. The following example uses a set of hist triggers to + produce a 'wakeup_latency' histogram: + + First, we define a 'wakeup_latency' synthetic event: + + # echo 'wakeup_latency u64 lat; pid_t pid; int prio' >> \ + /sys/kernel/debug/tracing/synthetic_events + + Next, we specify that whenever we see a sched_waking event for a + cyclictest thread, save the timestamp in a 'ts0' variable: + + # echo 'hist:keys=$saved_pid:saved_pid=pid:ts0=common_timestamp.usecs \ + if comm=="cyclictest"' >> \ + /sys/kernel/debug/tracing/events/sched/sched_waking/trigger + + Then, when the corresponding thread is actually scheduled onto the + CPU by a sched_switch event, calculate the latency and use that + along with another variable and an event field to generate a + wakeup_latency synthetic event: + + # echo 'hist:keys=next_pid:wakeup_lat=common_timestamp.usecs-$ts0:\ + onmatch(sched.sched_waking).wakeup_latency($wakeup_lat,\ + $saved_pid,next_prio) if next_comm=="cyclictest"' >> \ + /sys/kernel/debug/tracing/events/sched/sched_switch/trigger + + We also need to create a histogram on the wakeup_latency synthetic + event in order to aggregate the generated synthetic event data: + + # echo 'hist:keys=pid,prio,lat:sort=pid,lat' >> \ + /sys/kernel/debug/tracing/events/synthetic/wakeup_latency/trigger + + Finally, once we've run cyclictest to actually generate some + events, we can see the output by looking at the wakeup_latency + synthetic event's hist file: + + # cat /sys/kernel/debug/tracing/events/synthetic/wakeup_latency/hist + + - onmax(var).save(field,.. .) + + The 'onmax(var).save(field,...)' hist trigger action is invoked + whenever the value of 'var' associated with a histogram entry + exceeds the current maximum contained in that variable. + + The end result is that the trace event fields specified as the + onmax.save() params will be saved if 'var' exceeds the current + maximum for that hist trigger entry. This allows context from the + event that exhibited the new maximum to be saved for later + reference. When the histogram is displayed, additional fields + displaying the saved values will be printed. + + As an example the below defines a couple of hist triggers, one for + sched_waking and another for sched_switch, keyed on pid. Whenever + a sched_waking occurs, the timestamp is saved in the entry + corresponding to the current pid, and when the scheduler switches + back to that pid, the timestamp difference is calculated. If the + resulting latency, stored in wakeup_lat, exceeds the current + maximum latency, the values specified in the save() fields are + recoreded: + + # echo 'hist:keys=pid:ts0=common_timestamp.usecs \ + if comm=="cyclictest"' >> \ + /sys/kernel/debug/tracing/events/sched/sched_waking/trigger + + # echo 'hist:keys=next_pid:\ + wakeup_lat=common_timestamp.usecs-$ts0:\ + onmax($wakeup_lat).save(next_comm,prev_pid,prev_prio,prev_comm) \ + if next_comm=="cyclictest"' >> \ + /sys/kernel/debug/tracing/events/sched/sched_switch/trigger + + When the histogram is displayed, the max value and the saved + values corresponding to the max are displayed following the rest + of the fields: + + # cat /sys/kernel/debug/tracing/events/sched/sched_switch/hist + { next_pid: 2255 } hitcount: 239 + common_timestamp-ts0: 0 + max: 27 + next_comm: cyclictest + prev_pid: 0 prev_prio: 120 prev_comm: swapper/1 + + { next_pid: 2256 } hitcount: 2355 + common_timestamp-ts0: 0 + max: 49 next_comm: cyclictest + prev_pid: 0 prev_prio: 120 prev_comm: swapper/0 + + Totals: + Hits: 12970 + Entries: 2 + Dropped: 0 Index: linux-4.14.15-rt12/arch/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/arch/Kconfig +++ linux-4.14.15-rt12/arch/Kconfig @@ -17,6 +17,7 @@ config OPROFILE tristate "OProfile system profiling" depends on PROFILING depends on HAVE_OPROFILE + depends on !PREEMPT_RT_FULL select RING_BUFFER select RING_BUFFER_ALLOW_SWAP help Index: linux-4.14.15-rt12/arch/alpha/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/alpha/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/alpha/include/asm/spinlock_types.h @@ -2,10 +2,6 @@ #ifndef _ALPHA_SPINLOCK_TYPES_H #define _ALPHA_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - typedef struct { volatile unsigned int lock; } arch_spinlock_t; Index: linux-4.14.15-rt12/arch/arm/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/Kconfig +++ linux-4.14.15-rt12/arch/arm/Kconfig @@ -45,7 +45,7 @@ config ARM select HARDIRQS_SW_RESEND select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT) select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6 - select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU + select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU && !PREEMPT_RT_BASE select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU select HAVE_ARCH_MMAP_RND_BITS if MMU select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT) @@ -85,6 +85,7 @@ config ARM select HAVE_PERF_EVENTS select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP + select HAVE_PREEMPT_LAZY select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE) select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_SYSCALL_TRACEPOINTS @@ -2164,7 +2165,7 @@ config NEON config KERNEL_MODE_NEON bool "Support for NEON in kernel mode" - depends on NEON && AEABI + depends on NEON && AEABI && !PREEMPT_RT_BASE help Say Y to include support for NEON in kernel mode. Index: linux-4.14.15-rt12/arch/arm/include/asm/irq.h =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/include/asm/irq.h +++ linux-4.14.15-rt12/arch/arm/include/asm/irq.h @@ -23,6 +23,8 @@ #endif #ifndef __ASSEMBLY__ +#include + struct irqaction; struct pt_regs; extern void migrate_irqs(void); Index: linux-4.14.15-rt12/arch/arm/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/arm/include/asm/spinlock_types.h @@ -2,10 +2,6 @@ #ifndef __ASM_SPINLOCK_TYPES_H #define __ASM_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - #define TICKET_SHIFT 16 typedef struct { Index: linux-4.14.15-rt12/arch/arm/include/asm/switch_to.h =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/include/asm/switch_to.h +++ linux-4.14.15-rt12/arch/arm/include/asm/switch_to.h @@ -4,6 +4,13 @@ #include +#if defined CONFIG_PREEMPT_RT_FULL && defined CONFIG_HIGHMEM +void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p); +#else +static inline void +switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) { } +#endif + /* * For v7 SMP cores running a preemptible kernel we may be pre-empted * during a TLB maintenance operation, so execute an inner-shareable dsb @@ -26,6 +33,7 @@ extern struct task_struct *__switch_to(s #define switch_to(prev,next,last) \ do { \ __complete_pending_tlbi(); \ + switch_kmaps(prev, next); \ last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \ } while (0) Index: linux-4.14.15-rt12/arch/arm/include/asm/thread_info.h =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/include/asm/thread_info.h +++ linux-4.14.15-rt12/arch/arm/include/asm/thread_info.h @@ -49,6 +49,7 @@ struct cpu_context_save { struct thread_info { unsigned long flags; /* low level flags */ int preempt_count; /* 0 => preemptable, <0 => bug */ + int preempt_lazy_count; /* 0 => preemptable, <0 => bug */ mm_segment_t addr_limit; /* address limit */ struct task_struct *task; /* main task structure */ __u32 cpu; /* cpu */ @@ -142,7 +143,8 @@ extern int vfp_restore_user_hwstate(stru #define TIF_SYSCALL_TRACE 4 /* syscall trace active */ #define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */ #define TIF_SYSCALL_TRACEPOINT 6 /* syscall tracepoint instrumentation */ -#define TIF_SECCOMP 7 /* seccomp syscall filtering active */ +#define TIF_SECCOMP 8 /* seccomp syscall filtering active */ +#define TIF_NEED_RESCHED_LAZY 7 #define TIF_NOHZ 12 /* in adaptive nohz mode */ #define TIF_USING_IWMMXT 17 @@ -152,6 +154,7 @@ extern int vfp_restore_user_hwstate(stru #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) +#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY) #define _TIF_UPROBE (1 << TIF_UPROBE) #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) @@ -167,7 +170,8 @@ extern int vfp_restore_user_hwstate(stru * Change these and you break ASM code in entry-common.S */ #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ - _TIF_NOTIFY_RESUME | _TIF_UPROBE) + _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ + _TIF_NEED_RESCHED_LAZY) #endif /* __KERNEL__ */ #endif /* __ASM_ARM_THREAD_INFO_H */ Index: linux-4.14.15-rt12/arch/arm/kernel/asm-offsets.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/kernel/asm-offsets.c +++ linux-4.14.15-rt12/arch/arm/kernel/asm-offsets.c @@ -65,6 +65,7 @@ int main(void) BLANK(); DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count)); + DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count)); DEFINE(TI_ADDR_LIMIT, offsetof(struct thread_info, addr_limit)); DEFINE(TI_TASK, offsetof(struct thread_info, task)); DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); Index: linux-4.14.15-rt12/arch/arm/kernel/entry-armv.S =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/kernel/entry-armv.S +++ linux-4.14.15-rt12/arch/arm/kernel/entry-armv.S @@ -220,11 +220,18 @@ __irq_svc: #ifdef CONFIG_PREEMPT ldr r8, [tsk, #TI_PREEMPT] @ get preempt count - ldr r0, [tsk, #TI_FLAGS] @ get flags teq r8, #0 @ if preempt count != 0 + bne 1f @ return from exeption + ldr r0, [tsk, #TI_FLAGS] @ get flags + tst r0, #_TIF_NEED_RESCHED @ if NEED_RESCHED is set + blne svc_preempt @ preempt! + + ldr r8, [tsk, #TI_PREEMPT_LAZY] @ get preempt lazy count + teq r8, #0 @ if preempt lazy count != 0 movne r0, #0 @ force flags to 0 - tst r0, #_TIF_NEED_RESCHED + tst r0, #_TIF_NEED_RESCHED_LAZY blne svc_preempt +1: #endif svc_exit r5, irq = 1 @ return from exception @@ -239,8 +246,14 @@ svc_preempt: 1: bl preempt_schedule_irq @ irq en/disable is done inside ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS tst r0, #_TIF_NEED_RESCHED + bne 1b + tst r0, #_TIF_NEED_RESCHED_LAZY reteq r8 @ go again - b 1b + ldr r0, [tsk, #TI_PREEMPT_LAZY] @ get preempt lazy count + teq r0, #0 @ if preempt lazy count != 0 + beq 1b + ret r8 @ go again + #endif __und_fault: Index: linux-4.14.15-rt12/arch/arm/kernel/entry-common.S =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/kernel/entry-common.S +++ linux-4.14.15-rt12/arch/arm/kernel/entry-common.S @@ -53,7 +53,9 @@ ret_fast_syscall: cmp r2, #TASK_SIZE blne addr_limit_check_failed ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing - tst r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK + tst r1, #((_TIF_SYSCALL_WORK | _TIF_WORK_MASK) & ~_TIF_SECCOMP) + bne fast_work_pending + tst r1, #_TIF_SECCOMP bne fast_work_pending @@ -83,8 +85,11 @@ ret_fast_syscall: cmp r2, #TASK_SIZE blne addr_limit_check_failed ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing - tst r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK + tst r1, #((_TIF_SYSCALL_WORK | _TIF_WORK_MASK) & ~_TIF_SECCOMP) + bne do_slower_path + tst r1, #_TIF_SECCOMP beq no_work_pending +do_slower_path: UNWIND(.fnend ) ENDPROC(ret_fast_syscall) Index: linux-4.14.15-rt12/arch/arm/kernel/patch.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/kernel/patch.c +++ linux-4.14.15-rt12/arch/arm/kernel/patch.c @@ -16,7 +16,7 @@ struct patch { unsigned int insn; }; -static DEFINE_SPINLOCK(patch_lock); +static DEFINE_RAW_SPINLOCK(patch_lock); static void __kprobes *patch_map(void *addr, int fixmap, unsigned long *flags) __acquires(&patch_lock) @@ -33,7 +33,7 @@ static void __kprobes *patch_map(void *a return addr; if (flags) - spin_lock_irqsave(&patch_lock, *flags); + raw_spin_lock_irqsave(&patch_lock, *flags); else __acquire(&patch_lock); @@ -48,7 +48,7 @@ static void __kprobes patch_unmap(int fi clear_fixmap(fixmap); if (flags) - spin_unlock_irqrestore(&patch_lock, *flags); + raw_spin_unlock_irqrestore(&patch_lock, *flags); else __release(&patch_lock); } Index: linux-4.14.15-rt12/arch/arm/kernel/process.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/kernel/process.c +++ linux-4.14.15-rt12/arch/arm/kernel/process.c @@ -325,6 +325,30 @@ unsigned long arch_randomize_brk(struct } #ifdef CONFIG_MMU +/* + * CONFIG_SPLIT_PTLOCK_CPUS results in a page->ptl lock. If the lock is not + * initialized by pgtable_page_ctor() then a coredump of the vector page will + * fail. + */ +static int __init vectors_user_mapping_init_page(void) +{ + struct page *page; + unsigned long addr = 0xffff0000; + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + + pgd = pgd_offset_k(addr); + pud = pud_offset(pgd, addr); + pmd = pmd_offset(pud, addr); + page = pmd_page(*(pmd)); + + pgtable_page_ctor(page); + + return 0; +} +late_initcall(vectors_user_mapping_init_page); + #ifdef CONFIG_KUSER_HELPERS /* * The vectors page is always readable from user space for the Index: linux-4.14.15-rt12/arch/arm/kernel/signal.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/kernel/signal.c +++ linux-4.14.15-rt12/arch/arm/kernel/signal.c @@ -615,7 +615,8 @@ do_work_pending(struct pt_regs *regs, un */ trace_hardirqs_off(); do { - if (likely(thread_flags & _TIF_NEED_RESCHED)) { + if (likely(thread_flags & (_TIF_NEED_RESCHED | + _TIF_NEED_RESCHED_LAZY))) { schedule(); } else { if (unlikely(!user_mode(regs))) Index: linux-4.14.15-rt12/arch/arm/kernel/smp.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/kernel/smp.c +++ linux-4.14.15-rt12/arch/arm/kernel/smp.c @@ -236,8 +236,6 @@ int __cpu_disable(void) flush_cache_louis(); local_flush_tlb_all(); - clear_tasks_mm_cpumask(cpu); - return 0; } @@ -255,6 +253,7 @@ void __cpu_die(unsigned int cpu) } pr_debug("CPU%u: shutdown\n", cpu); + clear_tasks_mm_cpumask(cpu); /* * platform_cpu_kill() is generally expected to do the powering off * and/or cutting of clocks to the dying CPU. Optionally, this may Index: linux-4.14.15-rt12/arch/arm/kernel/unwind.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/kernel/unwind.c +++ linux-4.14.15-rt12/arch/arm/kernel/unwind.c @@ -93,7 +93,7 @@ extern const struct unwind_idx __start_u static const struct unwind_idx *__origin_unwind_idx; extern const struct unwind_idx __stop_unwind_idx[]; -static DEFINE_SPINLOCK(unwind_lock); +static DEFINE_RAW_SPINLOCK(unwind_lock); static LIST_HEAD(unwind_tables); /* Convert a prel31 symbol to an absolute address */ @@ -201,7 +201,7 @@ static const struct unwind_idx *unwind_f /* module unwind tables */ struct unwind_table *table; - spin_lock_irqsave(&unwind_lock, flags); + raw_spin_lock_irqsave(&unwind_lock, flags); list_for_each_entry(table, &unwind_tables, list) { if (addr >= table->begin_addr && addr < table->end_addr) { @@ -213,7 +213,7 @@ static const struct unwind_idx *unwind_f break; } } - spin_unlock_irqrestore(&unwind_lock, flags); + raw_spin_unlock_irqrestore(&unwind_lock, flags); } pr_debug("%s: idx = %p\n", __func__, idx); @@ -529,9 +529,9 @@ struct unwind_table *unwind_table_add(un tab->begin_addr = text_addr; tab->end_addr = text_addr + text_size; - spin_lock_irqsave(&unwind_lock, flags); + raw_spin_lock_irqsave(&unwind_lock, flags); list_add_tail(&tab->list, &unwind_tables); - spin_unlock_irqrestore(&unwind_lock, flags); + raw_spin_unlock_irqrestore(&unwind_lock, flags); return tab; } @@ -543,9 +543,9 @@ void unwind_table_del(struct unwind_tabl if (!tab) return; - spin_lock_irqsave(&unwind_lock, flags); + raw_spin_lock_irqsave(&unwind_lock, flags); list_del(&tab->list); - spin_unlock_irqrestore(&unwind_lock, flags); + raw_spin_unlock_irqrestore(&unwind_lock, flags); kfree(tab); } Index: linux-4.14.15-rt12/arch/arm/mach-exynos/platsmp.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/mach-exynos/platsmp.c +++ linux-4.14.15-rt12/arch/arm/mach-exynos/platsmp.c @@ -229,7 +229,7 @@ static void __iomem *scu_base_addr(void) return (void __iomem *)(S5P_VA_SCU); } -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); static void exynos_secondary_init(unsigned int cpu) { @@ -242,8 +242,8 @@ static void exynos_secondary_init(unsign /* * Synchronise with the boot thread. */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); + raw_spin_lock(&boot_lock); + raw_spin_unlock(&boot_lock); } int exynos_set_boot_addr(u32 core_id, unsigned long boot_addr) @@ -307,7 +307,7 @@ static int exynos_boot_secondary(unsigne * Set synchronisation state between this boot processor * and the secondary one */ - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); /* * The secondary processor is waiting to be released from @@ -334,7 +334,7 @@ static int exynos_boot_secondary(unsigne if (timeout == 0) { printk(KERN_ERR "cpu1 power enable failed"); - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return -ETIMEDOUT; } } @@ -380,7 +380,7 @@ static int exynos_boot_secondary(unsigne * calibrations, then wait for it to finish */ fail: - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return pen_release != -1 ? ret : 0; } Index: linux-4.14.15-rt12/arch/arm/mach-hisi/platmcpm.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/mach-hisi/platmcpm.c +++ linux-4.14.15-rt12/arch/arm/mach-hisi/platmcpm.c @@ -61,7 +61,7 @@ static void __iomem *sysctrl, *fabric; static int hip04_cpu_table[HIP04_MAX_CLUSTERS][HIP04_MAX_CPUS_PER_CLUSTER]; -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); static u32 fabric_phys_addr; /* * [0]: bootwrapper physical address @@ -113,7 +113,7 @@ static int hip04_boot_secondary(unsigned if (cluster >= HIP04_MAX_CLUSTERS || cpu >= HIP04_MAX_CPUS_PER_CLUSTER) return -EINVAL; - spin_lock_irq(&boot_lock); + raw_spin_lock_irq(&boot_lock); if (hip04_cpu_table[cluster][cpu]) goto out; @@ -147,7 +147,7 @@ static int hip04_boot_secondary(unsigned out: hip04_cpu_table[cluster][cpu]++; - spin_unlock_irq(&boot_lock); + raw_spin_unlock_irq(&boot_lock); return 0; } @@ -162,11 +162,11 @@ static void hip04_cpu_die(unsigned int l cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); hip04_cpu_table[cluster][cpu]--; if (hip04_cpu_table[cluster][cpu] == 1) { /* A power_up request went ahead of us. */ - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return; } else if (hip04_cpu_table[cluster][cpu] > 1) { pr_err("Cluster %d CPU%d boots multiple times\n", cluster, cpu); @@ -174,7 +174,7 @@ static void hip04_cpu_die(unsigned int l } last_man = hip04_cluster_is_down(cluster); - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); if (last_man) { /* Since it's Cortex A15, disable L2 prefetching. */ asm volatile( @@ -203,7 +203,7 @@ static int hip04_cpu_kill(unsigned int l cpu >= HIP04_MAX_CPUS_PER_CLUSTER); count = TIMEOUT_MSEC / POLL_MSEC; - spin_lock_irq(&boot_lock); + raw_spin_lock_irq(&boot_lock); for (tries = 0; tries < count; tries++) { if (hip04_cpu_table[cluster][cpu]) goto err; @@ -211,10 +211,10 @@ static int hip04_cpu_kill(unsigned int l data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster)); if (data & CORE_WFI_STATUS(cpu)) break; - spin_unlock_irq(&boot_lock); + raw_spin_unlock_irq(&boot_lock); /* Wait for clean L2 when the whole cluster is down. */ msleep(POLL_MSEC); - spin_lock_irq(&boot_lock); + raw_spin_lock_irq(&boot_lock); } if (tries >= count) goto err; @@ -231,10 +231,10 @@ static int hip04_cpu_kill(unsigned int l goto err; if (hip04_cluster_is_down(cluster)) hip04_set_snoop_filter(cluster, 0); - spin_unlock_irq(&boot_lock); + raw_spin_unlock_irq(&boot_lock); return 1; err: - spin_unlock_irq(&boot_lock); + raw_spin_unlock_irq(&boot_lock); return 0; } #endif Index: linux-4.14.15-rt12/arch/arm/mach-omap2/omap-smp.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/mach-omap2/omap-smp.c +++ linux-4.14.15-rt12/arch/arm/mach-omap2/omap-smp.c @@ -69,7 +69,7 @@ static const struct omap_smp_config omap .startup_addr = omap5_secondary_startup, }; -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); void __iomem *omap4_get_scu_base(void) { @@ -136,8 +136,8 @@ static void omap4_secondary_init(unsigne /* * Synchronise with the boot thread. */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); + raw_spin_lock(&boot_lock); + raw_spin_unlock(&boot_lock); } static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle) @@ -150,7 +150,7 @@ static int omap4_boot_secondary(unsigned * Set synchronisation state between this boot processor * and the secondary one */ - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); /* * Update the AuxCoreBoot0 with boot state for secondary core. @@ -229,7 +229,7 @@ static int omap4_boot_secondary(unsigned * Now the secondary core is starting up let it run its * calibrations, then wait for it to finish */ - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return 0; } Index: linux-4.14.15-rt12/arch/arm/mach-prima2/platsmp.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/mach-prima2/platsmp.c +++ linux-4.14.15-rt12/arch/arm/mach-prima2/platsmp.c @@ -22,7 +22,7 @@ static void __iomem *clk_base; -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); static void sirfsoc_secondary_init(unsigned int cpu) { @@ -36,8 +36,8 @@ static void sirfsoc_secondary_init(unsig /* * Synchronise with the boot thread. */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); + raw_spin_lock(&boot_lock); + raw_spin_unlock(&boot_lock); } static const struct of_device_id clk_ids[] = { @@ -75,7 +75,7 @@ static int sirfsoc_boot_secondary(unsign /* make sure write buffer is drained */ mb(); - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); /* * The secondary processor is waiting to be released from @@ -107,7 +107,7 @@ static int sirfsoc_boot_secondary(unsign * now the secondary core is starting up let it run its * calibrations, then wait for it to finish */ - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return pen_release != -1 ? -ENOSYS : 0; } Index: linux-4.14.15-rt12/arch/arm/mach-qcom/platsmp.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/mach-qcom/platsmp.c +++ linux-4.14.15-rt12/arch/arm/mach-qcom/platsmp.c @@ -46,7 +46,7 @@ extern void secondary_startup_arm(void); -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); #ifdef CONFIG_HOTPLUG_CPU static void qcom_cpu_die(unsigned int cpu) @@ -60,8 +60,8 @@ static void qcom_secondary_init(unsigned /* * Synchronise with the boot thread. */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); + raw_spin_lock(&boot_lock); + raw_spin_unlock(&boot_lock); } static int scss_release_secondary(unsigned int cpu) @@ -284,7 +284,7 @@ static int qcom_boot_secondary(unsigned * set synchronisation state between this boot processor * and the secondary one */ - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); /* * Send the secondary CPU a soft interrupt, thereby causing @@ -297,7 +297,7 @@ static int qcom_boot_secondary(unsigned * now the secondary core is starting up let it run its * calibrations, then wait for it to finish */ - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return ret; } Index: linux-4.14.15-rt12/arch/arm/mach-spear/platsmp.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/mach-spear/platsmp.c +++ linux-4.14.15-rt12/arch/arm/mach-spear/platsmp.c @@ -32,7 +32,7 @@ static void write_pen_release(int val) sync_cache_w(&pen_release); } -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); static void __iomem *scu_base = IOMEM(VA_SCU_BASE); @@ -47,8 +47,8 @@ static void spear13xx_secondary_init(uns /* * Synchronise with the boot thread. */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); + raw_spin_lock(&boot_lock); + raw_spin_unlock(&boot_lock); } static int spear13xx_boot_secondary(unsigned int cpu, struct task_struct *idle) @@ -59,7 +59,7 @@ static int spear13xx_boot_secondary(unsi * set synchronisation state between this boot processor * and the secondary one */ - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); /* * The secondary processor is waiting to be released from @@ -84,7 +84,7 @@ static int spear13xx_boot_secondary(unsi * now the secondary core is starting up let it run its * calibrations, then wait for it to finish */ - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return pen_release != -1 ? -ENOSYS : 0; } Index: linux-4.14.15-rt12/arch/arm/mach-sti/platsmp.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/mach-sti/platsmp.c +++ linux-4.14.15-rt12/arch/arm/mach-sti/platsmp.c @@ -35,7 +35,7 @@ static void write_pen_release(int val) sync_cache_w(&pen_release); } -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); static void sti_secondary_init(unsigned int cpu) { @@ -48,8 +48,8 @@ static void sti_secondary_init(unsigned /* * Synchronise with the boot thread. */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); + raw_spin_lock(&boot_lock); + raw_spin_unlock(&boot_lock); } static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle) @@ -60,7 +60,7 @@ static int sti_boot_secondary(unsigned i * set synchronisation state between this boot processor * and the secondary one */ - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); /* * The secondary processor is waiting to be released from @@ -91,7 +91,7 @@ static int sti_boot_secondary(unsigned i * now the secondary core is starting up let it run its * calibrations, then wait for it to finish */ - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return pen_release != -1 ? -ENOSYS : 0; } Index: linux-4.14.15-rt12/arch/arm/mm/fault.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/mm/fault.c +++ linux-4.14.15-rt12/arch/arm/mm/fault.c @@ -434,6 +434,9 @@ do_translation_fault(unsigned long addr, if (addr < TASK_SIZE) return do_page_fault(addr, fsr, regs); + if (interrupts_enabled(regs)) + local_irq_enable(); + if (user_mode(regs)) goto bad_area; @@ -501,6 +504,9 @@ do_translation_fault(unsigned long addr, static int do_sect_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { + if (interrupts_enabled(regs)) + local_irq_enable(); + do_bad_area(addr, fsr, regs); return 0; } Index: linux-4.14.15-rt12/arch/arm/mm/highmem.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/mm/highmem.c +++ linux-4.14.15-rt12/arch/arm/mm/highmem.c @@ -34,6 +34,11 @@ static inline pte_t get_fixmap_pte(unsig return *ptep; } +static unsigned int fixmap_idx(int type) +{ + return FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); +} + void *kmap(struct page *page) { might_sleep(); @@ -54,12 +59,13 @@ EXPORT_SYMBOL(kunmap); void *kmap_atomic(struct page *page) { + pte_t pte = mk_pte(page, kmap_prot); unsigned int idx; unsigned long vaddr; void *kmap; int type; - preempt_disable(); + preempt_disable_nort(); pagefault_disable(); if (!PageHighMem(page)) return page_address(page); @@ -79,7 +85,7 @@ void *kmap_atomic(struct page *page) type = kmap_atomic_idx_push(); - idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); + idx = fixmap_idx(type); vaddr = __fix_to_virt(idx); #ifdef CONFIG_DEBUG_HIGHMEM /* @@ -93,7 +99,10 @@ void *kmap_atomic(struct page *page) * in place, so the contained TLB flush ensures the TLB is updated * with the new mapping. */ - set_fixmap_pte(idx, mk_pte(page, kmap_prot)); +#ifdef CONFIG_PREEMPT_RT_FULL + current->kmap_pte[type] = pte; +#endif + set_fixmap_pte(idx, pte); return (void *)vaddr; } @@ -106,44 +115,75 @@ void __kunmap_atomic(void *kvaddr) if (kvaddr >= (void *)FIXADDR_START) { type = kmap_atomic_idx(); - idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); + idx = fixmap_idx(type); if (cache_is_vivt()) __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE); +#ifdef CONFIG_PREEMPT_RT_FULL + current->kmap_pte[type] = __pte(0); +#endif #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(vaddr != __fix_to_virt(idx)); - set_fixmap_pte(idx, __pte(0)); #else (void) idx; /* to kill a warning */ #endif + set_fixmap_pte(idx, __pte(0)); kmap_atomic_idx_pop(); } else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) { /* this address was obtained through kmap_high_get() */ kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)])); } pagefault_enable(); - preempt_enable(); + preempt_enable_nort(); } EXPORT_SYMBOL(__kunmap_atomic); void *kmap_atomic_pfn(unsigned long pfn) { + pte_t pte = pfn_pte(pfn, kmap_prot); unsigned long vaddr; int idx, type; struct page *page = pfn_to_page(pfn); - preempt_disable(); + preempt_disable_nort(); pagefault_disable(); if (!PageHighMem(page)) return page_address(page); type = kmap_atomic_idx_push(); - idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id(); + idx = fixmap_idx(type); vaddr = __fix_to_virt(idx); #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(!pte_none(get_fixmap_pte(vaddr))); #endif - set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot)); +#ifdef CONFIG_PREEMPT_RT_FULL + current->kmap_pte[type] = pte; +#endif + set_fixmap_pte(idx, pte); return (void *)vaddr; } +#if defined CONFIG_PREEMPT_RT_FULL +void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) +{ + int i; + + /* + * Clear @prev's kmap_atomic mappings + */ + for (i = 0; i < prev_p->kmap_idx; i++) { + int idx = fixmap_idx(i); + + set_fixmap_pte(idx, __pte(0)); + } + /* + * Restore @next_p's kmap_atomic mappings + */ + for (i = 0; i < next_p->kmap_idx; i++) { + int idx = fixmap_idx(i); + + if (!pte_none(next_p->kmap_pte[i])) + set_fixmap_pte(idx, next_p->kmap_pte[i]); + } +} +#endif Index: linux-4.14.15-rt12/arch/arm/plat-versatile/platsmp.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm/plat-versatile/platsmp.c +++ linux-4.14.15-rt12/arch/arm/plat-versatile/platsmp.c @@ -32,7 +32,7 @@ static void write_pen_release(int val) sync_cache_w(&pen_release); } -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); void versatile_secondary_init(unsigned int cpu) { @@ -45,8 +45,8 @@ void versatile_secondary_init(unsigned i /* * Synchronise with the boot thread. */ - spin_lock(&boot_lock); - spin_unlock(&boot_lock); + raw_spin_lock(&boot_lock); + raw_spin_unlock(&boot_lock); } int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle) @@ -57,7 +57,7 @@ int versatile_boot_secondary(unsigned in * Set synchronisation state between this boot processor * and the secondary one */ - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); /* * This is really belt and braces; we hold unintended secondary @@ -87,7 +87,7 @@ int versatile_boot_secondary(unsigned in * now the secondary core is starting up let it run its * calibrations, then wait for it to finish */ - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); return pen_release != -1 ? -ENOSYS : 0; } Index: linux-4.14.15-rt12/arch/arm64/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/arch/arm64/Kconfig +++ linux-4.14.15-rt12/arch/arm64/Kconfig @@ -103,6 +103,7 @@ config ARM64 select HAVE_PERF_EVENTS select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP + select HAVE_PREEMPT_LAZY select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RCU_TABLE_FREE select HAVE_SYSCALL_TRACEPOINTS @@ -777,7 +778,7 @@ config XEN_DOM0 config XEN bool "Xen guest support on ARM64" - depends on ARM64 && OF + depends on ARM64 && OF && !PREEMPT_RT_FULL select SWIOTLB_XEN select PARAVIRT help Index: linux-4.14.15-rt12/arch/arm64/crypto/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/arch/arm64/crypto/Kconfig +++ linux-4.14.15-rt12/arch/arm64/crypto/Kconfig @@ -19,19 +19,19 @@ config CRYPTO_SHA512_ARM64 config CRYPTO_SHA1_ARM64_CE tristate "SHA-1 digest algorithm (ARMv8 Crypto Extensions)" - depends on KERNEL_MODE_NEON + depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE select CRYPTO_HASH select CRYPTO_SHA1 config CRYPTO_SHA2_ARM64_CE tristate "SHA-224/SHA-256 digest algorithm (ARMv8 Crypto Extensions)" - depends on KERNEL_MODE_NEON + depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE select CRYPTO_HASH select CRYPTO_SHA256_ARM64 config CRYPTO_GHASH_ARM64_CE tristate "GHASH/AES-GCM using ARMv8 Crypto Extensions" - depends on KERNEL_MODE_NEON + depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE select CRYPTO_HASH select CRYPTO_GF128MUL select CRYPTO_AES @@ -39,7 +39,7 @@ config CRYPTO_GHASH_ARM64_CE config CRYPTO_CRCT10DIF_ARM64_CE tristate "CRCT10DIF digest algorithm using PMULL instructions" - depends on KERNEL_MODE_NEON && CRC_T10DIF + depends on KERNEL_MODE_NEON && CRC_T10DIF && !PREEMPT_RT_BASE select CRYPTO_HASH config CRYPTO_CRC32_ARM64_CE @@ -53,13 +53,13 @@ config CRYPTO_AES_ARM64 config CRYPTO_AES_ARM64_CE tristate "AES core cipher using ARMv8 Crypto Extensions" - depends on ARM64 && KERNEL_MODE_NEON + depends on ARM64 && KERNEL_MODE_NEON && !PREEMPT_RT_BASE select CRYPTO_ALGAPI select CRYPTO_AES_ARM64 config CRYPTO_AES_ARM64_CE_CCM tristate "AES in CCM mode using ARMv8 Crypto Extensions" - depends on ARM64 && KERNEL_MODE_NEON + depends on ARM64 && KERNEL_MODE_NEON && !PREEMPT_RT_BASE select CRYPTO_ALGAPI select CRYPTO_AES_ARM64_CE select CRYPTO_AES_ARM64 @@ -67,7 +67,7 @@ config CRYPTO_AES_ARM64_CE_CCM config CRYPTO_AES_ARM64_CE_BLK tristate "AES in ECB/CBC/CTR/XTS modes using ARMv8 Crypto Extensions" - depends on KERNEL_MODE_NEON + depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE select CRYPTO_BLKCIPHER select CRYPTO_AES_ARM64_CE select CRYPTO_AES_ARM64 @@ -75,7 +75,7 @@ config CRYPTO_AES_ARM64_CE_BLK config CRYPTO_AES_ARM64_NEON_BLK tristate "AES in ECB/CBC/CTR/XTS modes using NEON instructions" - depends on KERNEL_MODE_NEON + depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE select CRYPTO_BLKCIPHER select CRYPTO_AES_ARM64 select CRYPTO_AES @@ -83,13 +83,13 @@ config CRYPTO_AES_ARM64_NEON_BLK config CRYPTO_CHACHA20_NEON tristate "NEON accelerated ChaCha20 symmetric cipher" - depends on KERNEL_MODE_NEON + depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE select CRYPTO_BLKCIPHER select CRYPTO_CHACHA20 config CRYPTO_AES_ARM64_BS tristate "AES in ECB/CBC/CTR/XTS modes using bit-sliced NEON algorithm" - depends on KERNEL_MODE_NEON + depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE select CRYPTO_BLKCIPHER select CRYPTO_AES_ARM64_NEON_BLK select CRYPTO_AES_ARM64 Index: linux-4.14.15-rt12/arch/arm64/crypto/crc32-ce-glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm64/crypto/crc32-ce-glue.c +++ linux-4.14.15-rt12/arch/arm64/crypto/crc32-ce-glue.c @@ -208,7 +208,8 @@ static struct shash_alg crc32_pmull_algs static int __init crc32_pmull_mod_init(void) { - if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && (elf_hwcap & HWCAP_PMULL)) { + if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && + !IS_ENABLED(CONFIG_PREEMPT_RT_BASE) && (elf_hwcap & HWCAP_PMULL)) { crc32_pmull_algs[0].update = crc32_pmull_update; crc32_pmull_algs[1].update = crc32c_pmull_update; Index: linux-4.14.15-rt12/arch/arm64/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/arm64/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/arm64/include/asm/spinlock_types.h @@ -16,10 +16,6 @@ #ifndef __ASM_SPINLOCK_TYPES_H #define __ASM_SPINLOCK_TYPES_H -#if !defined(__LINUX_SPINLOCK_TYPES_H) && !defined(__ASM_SPINLOCK_H) -# error "please don't include this file directly" -#endif - #include #define TICKET_SHIFT 16 Index: linux-4.14.15-rt12/arch/arm64/include/asm/thread_info.h =================================================================== --- linux-4.14.15-rt12.orig/arch/arm64/include/asm/thread_info.h +++ linux-4.14.15-rt12/arch/arm64/include/asm/thread_info.h @@ -43,6 +43,7 @@ struct thread_info { u64 ttbr0; /* saved TTBR0_EL1 */ #endif int preempt_count; /* 0 => preemptable, <0 => bug */ + int preempt_lazy_count; /* 0 => preemptable, <0 => bug */ }; #define INIT_THREAD_INFO(tsk) \ @@ -82,6 +83,7 @@ void arch_setup_new_exec(void); #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */ #define TIF_UPROBE 4 /* uprobe breakpoint or singlestep */ #define TIF_FSCHECK 5 /* Check FS is USER_DS on return */ +#define TIF_NEED_RESCHED_LAZY 6 #define TIF_NOHZ 7 #define TIF_SYSCALL_TRACE 8 #define TIF_SYSCALL_AUDIT 9 @@ -97,6 +99,7 @@ void arch_setup_new_exec(void); #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_FOREIGN_FPSTATE (1 << TIF_FOREIGN_FPSTATE) +#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY) #define _TIF_NOHZ (1 << TIF_NOHZ) #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) @@ -108,8 +111,9 @@ void arch_setup_new_exec(void); #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \ - _TIF_UPROBE | _TIF_FSCHECK) + _TIF_UPROBE | _TIF_FSCHECK | _TIF_NEED_RESCHED_LAZY) +#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY) #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \ _TIF_NOHZ) Index: linux-4.14.15-rt12/arch/arm64/kernel/asm-offsets.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm64/kernel/asm-offsets.c +++ linux-4.14.15-rt12/arch/arm64/kernel/asm-offsets.c @@ -39,6 +39,7 @@ int main(void) BLANK(); DEFINE(TSK_TI_FLAGS, offsetof(struct task_struct, thread_info.flags)); DEFINE(TSK_TI_PREEMPT, offsetof(struct task_struct, thread_info.preempt_count)); + DEFINE(TSK_TI_PREEMPT_LAZY, offsetof(struct task_struct, thread_info.preempt_lazy_count)); DEFINE(TSK_TI_ADDR_LIMIT, offsetof(struct task_struct, thread_info.addr_limit)); #ifdef CONFIG_ARM64_SW_TTBR0_PAN DEFINE(TSK_TI_TTBR0, offsetof(struct task_struct, thread_info.ttbr0)); Index: linux-4.14.15-rt12/arch/arm64/kernel/entry.S =================================================================== --- linux-4.14.15-rt12.orig/arch/arm64/kernel/entry.S +++ linux-4.14.15-rt12/arch/arm64/kernel/entry.S @@ -607,11 +607,16 @@ el1_irq: #ifdef CONFIG_PREEMPT ldr w24, [tsk, #TSK_TI_PREEMPT] // get preempt count - cbnz w24, 1f // preempt count != 0 + cbnz w24, 2f // preempt count != 0 ldr x0, [tsk, #TSK_TI_FLAGS] // get flags - tbz x0, #TIF_NEED_RESCHED, 1f // needs rescheduling? - bl el1_preempt + tbnz x0, #TIF_NEED_RESCHED, 1f // needs rescheduling? + + ldr w24, [tsk, #TSK_TI_PREEMPT_LAZY] // get preempt lazy count + cbnz w24, 2f // preempt lazy count != 0 + tbz x0, #TIF_NEED_RESCHED_LAZY, 2f // needs rescheduling? 1: + bl el1_preempt +2: #endif #ifdef CONFIG_TRACE_IRQFLAGS bl trace_hardirqs_on @@ -625,6 +630,7 @@ el1_preempt: 1: bl preempt_schedule_irq // irq en/disable is done inside ldr x0, [tsk, #TSK_TI_FLAGS] // get new tasks TI_FLAGS tbnz x0, #TIF_NEED_RESCHED, 1b // needs rescheduling? + tbnz x0, #TIF_NEED_RESCHED_LAZY, 1b // needs rescheduling? ret x24 #endif Index: linux-4.14.15-rt12/arch/arm64/kernel/signal.c =================================================================== --- linux-4.14.15-rt12.orig/arch/arm64/kernel/signal.c +++ linux-4.14.15-rt12/arch/arm64/kernel/signal.c @@ -755,7 +755,7 @@ asmlinkage void do_notify_resume(struct /* Check valid user FS if needed */ addr_limit_user_check(); - if (thread_flags & _TIF_NEED_RESCHED) { + if (thread_flags & _TIF_NEED_RESCHED_MASK) { schedule(); } else { local_irq_enable(); Index: linux-4.14.15-rt12/arch/blackfin/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/blackfin/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/blackfin/include/asm/spinlock_types.h @@ -7,10 +7,6 @@ #ifndef __ASM_SPINLOCK_TYPES_H #define __ASM_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - #include typedef struct { Index: linux-4.14.15-rt12/arch/hexagon/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/hexagon/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/hexagon/include/asm/spinlock_types.h @@ -21,10 +21,6 @@ #ifndef _ASM_SPINLOCK_TYPES_H #define _ASM_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - typedef struct { volatile unsigned int lock; } arch_spinlock_t; Index: linux-4.14.15-rt12/arch/ia64/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/ia64/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/ia64/include/asm/spinlock_types.h @@ -2,10 +2,6 @@ #ifndef _ASM_IA64_SPINLOCK_TYPES_H #define _ASM_IA64_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - typedef struct { volatile unsigned int lock; } arch_spinlock_t; Index: linux-4.14.15-rt12/arch/ia64/kernel/mca.c =================================================================== --- linux-4.14.15-rt12.orig/arch/ia64/kernel/mca.c +++ linux-4.14.15-rt12/arch/ia64/kernel/mca.c @@ -1824,7 +1824,7 @@ format_mca_init_stack(void *mca_data, un ti->cpu = cpu; p->stack = ti; p->state = TASK_UNINTERRUPTIBLE; - cpumask_set_cpu(cpu, &p->cpus_allowed); + cpumask_set_cpu(cpu, &p->cpus_mask); INIT_LIST_HEAD(&p->tasks); p->parent = p->real_parent = p->group_leader = p; INIT_LIST_HEAD(&p->children); Index: linux-4.14.15-rt12/arch/m32r/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/m32r/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/m32r/include/asm/spinlock_types.h @@ -2,10 +2,6 @@ #ifndef _ASM_M32R_SPINLOCK_TYPES_H #define _ASM_M32R_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - typedef struct { volatile int slock; } arch_spinlock_t; Index: linux-4.14.15-rt12/arch/metag/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/metag/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/metag/include/asm/spinlock_types.h @@ -2,10 +2,6 @@ #ifndef _ASM_METAG_SPINLOCK_TYPES_H #define _ASM_METAG_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - typedef struct { volatile unsigned int lock; } arch_spinlock_t; Index: linux-4.14.15-rt12/arch/mips/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/arch/mips/Kconfig +++ linux-4.14.15-rt12/arch/mips/Kconfig @@ -2519,7 +2519,7 @@ config MIPS_ASID_BITS_VARIABLE # config HIGHMEM bool "High Memory Support" - depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !CPU_MIPS32_3_5_EVA + depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !CPU_MIPS32_3_5_EVA && !PREEMPT_RT_FULL config CPU_SUPPORTS_HIGHMEM bool Index: linux-4.14.15-rt12/arch/mips/include/asm/switch_to.h =================================================================== --- linux-4.14.15-rt12.orig/arch/mips/include/asm/switch_to.h +++ linux-4.14.15-rt12/arch/mips/include/asm/switch_to.h @@ -42,7 +42,7 @@ extern struct task_struct *ll_task; * inline to try to keep the overhead down. If we have been forced to run on * a "CPU" with an FPU because of a previous high level of FP computation, * but did not actually use the FPU during the most recent time-slice (CU1 - * isn't set), we undo the restriction on cpus_allowed. + * isn't set), we undo the restriction on cpus_mask. * * We're not calling set_cpus_allowed() here, because we have no need to * force prompt migration - we're already switching the current CPU to a @@ -57,7 +57,7 @@ do { \ test_ti_thread_flag(__prev_ti, TIF_FPUBOUND) && \ (!(KSTK_STATUS(prev) & ST0_CU1))) { \ clear_ti_thread_flag(__prev_ti, TIF_FPUBOUND); \ - prev->cpus_allowed = prev->thread.user_cpus_allowed; \ + prev->cpus_mask = prev->thread.user_cpus_allowed; \ } \ next->thread.emulated_fp = 0; \ } while(0) Index: linux-4.14.15-rt12/arch/mips/kernel/mips-mt-fpaff.c =================================================================== --- linux-4.14.15-rt12.orig/arch/mips/kernel/mips-mt-fpaff.c +++ linux-4.14.15-rt12/arch/mips/kernel/mips-mt-fpaff.c @@ -177,7 +177,7 @@ asmlinkage long mipsmt_sys_sched_getaffi if (retval) goto out_unlock; - cpumask_or(&allowed, &p->thread.user_cpus_allowed, &p->cpus_allowed); + cpumask_or(&allowed, &p->thread.user_cpus_allowed, p->cpus_ptr); cpumask_and(&mask, &allowed, cpu_active_mask); out_unlock: Index: linux-4.14.15-rt12/arch/mips/kernel/traps.c =================================================================== --- linux-4.14.15-rt12.orig/arch/mips/kernel/traps.c +++ linux-4.14.15-rt12/arch/mips/kernel/traps.c @@ -1192,12 +1192,12 @@ static void mt_ase_fp_affinity(void) * restricted the allowed set to exclude any CPUs with FPUs, * we'll skip the procedure. */ - if (cpumask_intersects(¤t->cpus_allowed, &mt_fpu_cpumask)) { + if (cpumask_intersects(¤t->cpus_mask, &mt_fpu_cpumask)) { cpumask_t tmask; current->thread.user_cpus_allowed - = current->cpus_allowed; - cpumask_and(&tmask, ¤t->cpus_allowed, + = current->cpus_mask; + cpumask_and(&tmask, ¤t->cpus_mask, &mt_fpu_cpumask); set_cpus_allowed_ptr(current, &tmask); set_thread_flag(TIF_FPUBOUND); Index: linux-4.14.15-rt12/arch/mn10300/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/mn10300/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/mn10300/include/asm/spinlock_types.h @@ -2,10 +2,6 @@ #ifndef _ASM_SPINLOCK_TYPES_H #define _ASM_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - typedef struct arch_spinlock { unsigned int slock; } arch_spinlock_t; Index: linux-4.14.15-rt12/arch/powerpc/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/arch/powerpc/Kconfig +++ linux-4.14.15-rt12/arch/powerpc/Kconfig @@ -111,10 +111,11 @@ config LOCKDEP_SUPPORT config RWSEM_GENERIC_SPINLOCK bool + default y if PREEMPT_RT_FULL config RWSEM_XCHGADD_ALGORITHM bool - default y + default y if !PREEMPT_RT_FULL config GENERIC_LOCKBREAK bool @@ -215,6 +216,7 @@ config PPC select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !HAVE_HARDLOCKUP_DETECTOR_ARCH select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP + select HAVE_PREEMPT_LAZY select HAVE_RCU_TABLE_FREE if SMP select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_SYSCALL_TRACEPOINTS @@ -390,7 +392,7 @@ menu "Kernel options" config HIGHMEM bool "High memory support" - depends on PPC32 + depends on PPC32 && !PREEMPT_RT_FULL source kernel/Kconfig.hz source kernel/Kconfig.preempt Index: linux-4.14.15-rt12/arch/powerpc/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/powerpc/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/powerpc/include/asm/spinlock_types.h @@ -2,10 +2,6 @@ #ifndef _ASM_POWERPC_SPINLOCK_TYPES_H #define _ASM_POWERPC_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - typedef struct { volatile unsigned int slock; } arch_spinlock_t; Index: linux-4.14.15-rt12/arch/powerpc/include/asm/thread_info.h =================================================================== --- linux-4.14.15-rt12.orig/arch/powerpc/include/asm/thread_info.h +++ linux-4.14.15-rt12/arch/powerpc/include/asm/thread_info.h @@ -36,6 +36,8 @@ struct thread_info { int cpu; /* cpu we're on */ int preempt_count; /* 0 => preemptable, <0 => BUG */ + int preempt_lazy_count; /* 0 => preemptable, + <0 => BUG */ unsigned long local_flags; /* private flags for thread */ #ifdef CONFIG_LIVEPATCH unsigned long *livepatch_sp; @@ -81,8 +83,7 @@ static inline struct thread_info *curren #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ #define TIF_SIGPENDING 1 /* signal pending */ #define TIF_NEED_RESCHED 2 /* rescheduling necessary */ -#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling - TIF_NEED_RESCHED */ +#define TIF_NEED_RESCHED_LAZY 3 /* lazy rescheduling necessary */ #define TIF_32BIT 4 /* 32 bit binary */ #define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */ #define TIF_PATCH_PENDING 6 /* pending live patching update */ @@ -101,6 +102,8 @@ static inline struct thread_info *curren #if defined(CONFIG_PPC64) #define TIF_ELF2ABI 18 /* function descriptors must die! */ #endif +#define TIF_POLLING_NRFLAG 19 /* true if poll_idle() is polling + TIF_NEED_RESCHED */ /* as above, but as bit values */ #define _TIF_SYSCALL_TRACE (1<flags) set_bits(irqtp->flags, &curtp->flags); } +#endif irq_hw_number_t virq_to_hw(unsigned int virq) { Index: linux-4.14.15-rt12/arch/powerpc/kernel/misc_32.S =================================================================== --- linux-4.14.15-rt12.orig/arch/powerpc/kernel/misc_32.S +++ linux-4.14.15-rt12/arch/powerpc/kernel/misc_32.S @@ -41,6 +41,7 @@ * We store the saved ksp_limit in the unused part * of the STACK_FRAME_OVERHEAD */ +#ifndef CONFIG_PREEMPT_RT_FULL _GLOBAL(call_do_softirq) mflr r0 stw r0,4(r1) @@ -57,6 +58,7 @@ _GLOBAL(call_do_softirq) stw r10,THREAD+KSP_LIMIT(r2) mtlr r0 blr +#endif /* * void call_do_irq(struct pt_regs *regs, struct thread_info *irqtp); Index: linux-4.14.15-rt12/arch/powerpc/kernel/misc_64.S =================================================================== --- linux-4.14.15-rt12.orig/arch/powerpc/kernel/misc_64.S +++ linux-4.14.15-rt12/arch/powerpc/kernel/misc_64.S @@ -31,6 +31,7 @@ .text +#ifndef CONFIG_PREEMPT_RT_FULL _GLOBAL(call_do_softirq) mflr r0 std r0,16(r1) @@ -41,6 +42,7 @@ _GLOBAL(call_do_softirq) ld r0,16(r1) mtlr r0 blr +#endif _GLOBAL(call_do_irq) mflr r0 Index: linux-4.14.15-rt12/arch/powerpc/kvm/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/arch/powerpc/kvm/Kconfig +++ linux-4.14.15-rt12/arch/powerpc/kvm/Kconfig @@ -177,6 +177,7 @@ config KVM_E500MC config KVM_MPIC bool "KVM in-kernel MPIC emulation" depends on KVM && E500 + depends on !PREEMPT_RT_FULL select HAVE_KVM_IRQCHIP select HAVE_KVM_IRQFD select HAVE_KVM_IRQ_ROUTING Index: linux-4.14.15-rt12/arch/powerpc/platforms/cell/spufs/sched.c =================================================================== --- linux-4.14.15-rt12.orig/arch/powerpc/platforms/cell/spufs/sched.c +++ linux-4.14.15-rt12/arch/powerpc/platforms/cell/spufs/sched.c @@ -141,7 +141,7 @@ void __spu_update_sched_info(struct spu_ * runqueue. The context will be rescheduled on the proper node * if it is timesliced or preempted. */ - cpumask_copy(&ctx->cpus_allowed, ¤t->cpus_allowed); + cpumask_copy(&ctx->cpus_allowed, current->cpus_ptr); /* Save the current cpu id for spu interrupt routing. */ ctx->last_ran = raw_smp_processor_id(); Index: linux-4.14.15-rt12/arch/powerpc/platforms/ps3/device-init.c =================================================================== --- linux-4.14.15-rt12.orig/arch/powerpc/platforms/ps3/device-init.c +++ linux-4.14.15-rt12/arch/powerpc/platforms/ps3/device-init.c @@ -752,7 +752,7 @@ static int ps3_notification_read_write(s } pr_debug("%s:%u: notification %s issued\n", __func__, __LINE__, op); - res = wait_event_interruptible(dev->done.wait, + res = swait_event_interruptible(dev->done.wait, dev->done.done || kthread_should_stop()); if (kthread_should_stop()) res = -EINTR; Index: linux-4.14.15-rt12/arch/s390/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/s390/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/s390/include/asm/spinlock_types.h @@ -2,10 +2,6 @@ #ifndef __ASM_SPINLOCK_TYPES_H #define __ASM_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - typedef struct { int lock; } __attribute__ ((aligned (4))) arch_spinlock_t; Index: linux-4.14.15-rt12/arch/sh/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/sh/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/sh/include/asm/spinlock_types.h @@ -2,10 +2,6 @@ #ifndef __ASM_SH_SPINLOCK_TYPES_H #define __ASM_SH_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - typedef struct { volatile unsigned int lock; } arch_spinlock_t; Index: linux-4.14.15-rt12/arch/sh/kernel/irq.c =================================================================== --- linux-4.14.15-rt12.orig/arch/sh/kernel/irq.c +++ linux-4.14.15-rt12/arch/sh/kernel/irq.c @@ -148,6 +148,7 @@ void irq_ctx_exit(int cpu) hardirq_ctx[cpu] = NULL; } +#ifndef CONFIG_PREEMPT_RT_FULL void do_softirq_own_stack(void) { struct thread_info *curctx; @@ -175,6 +176,7 @@ void do_softirq_own_stack(void) "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr" ); } +#endif #else static inline void handle_one_irq(unsigned int irq) { Index: linux-4.14.15-rt12/arch/sparc/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/arch/sparc/Kconfig +++ linux-4.14.15-rt12/arch/sparc/Kconfig @@ -206,12 +206,10 @@ config NR_CPUS source kernel/Kconfig.hz config RWSEM_GENERIC_SPINLOCK - bool - default y if SPARC32 + def_bool PREEMPT_RT_FULL config RWSEM_XCHGADD_ALGORITHM - bool - default y if SPARC64 + def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL config GENERIC_HWEIGHT bool Index: linux-4.14.15-rt12/arch/sparc/kernel/irq_64.c =================================================================== --- linux-4.14.15-rt12.orig/arch/sparc/kernel/irq_64.c +++ linux-4.14.15-rt12/arch/sparc/kernel/irq_64.c @@ -855,6 +855,7 @@ void __irq_entry handler_irq(int pil, st set_irq_regs(old_regs); } +#ifndef CONFIG_PREEMPT_RT_FULL void do_softirq_own_stack(void) { void *orig_sp, *sp = softirq_stack[smp_processor_id()]; @@ -869,6 +870,7 @@ void do_softirq_own_stack(void) __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp)); } +#endif #ifdef CONFIG_HOTPLUG_CPU void fixup_irqs(void) Index: linux-4.14.15-rt12/arch/tile/include/asm/setup.h =================================================================== --- linux-4.14.15-rt12.orig/arch/tile/include/asm/setup.h +++ linux-4.14.15-rt12/arch/tile/include/asm/setup.h @@ -49,7 +49,7 @@ int hardwall_ipi_valid(int cpu); /* Hook hardwall code into changes in affinity. */ #define arch_set_cpus_allowed(p, new_mask) do { \ - if (!cpumask_equal(&p->cpus_allowed, new_mask)) \ + if (!cpumask_equal(p->cpus_ptr, new_mask)) \ hardwall_deactivate_all(p); \ } while (0) #endif Index: linux-4.14.15-rt12/arch/tile/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/tile/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/tile/include/asm/spinlock_types.h @@ -15,10 +15,6 @@ #ifndef _ASM_TILE_SPINLOCK_TYPES_H #define _ASM_TILE_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - #ifdef __tilegx__ /* Low 15 bits are "next"; high 15 bits are "current". */ Index: linux-4.14.15-rt12/arch/tile/kernel/hardwall.c =================================================================== --- linux-4.14.15-rt12.orig/arch/tile/kernel/hardwall.c +++ linux-4.14.15-rt12/arch/tile/kernel/hardwall.c @@ -590,12 +590,12 @@ static int hardwall_activate(struct hard * Get our affinity; if we're not bound to this tile uniquely, * we can't access the network registers. */ - if (cpumask_weight(&p->cpus_allowed) != 1) + if (p->nr_cpus_allowed != 1) return -EPERM; /* Make sure we are bound to a cpu assigned to this resource. */ cpu = smp_processor_id(); - BUG_ON(cpumask_first(&p->cpus_allowed) != cpu); + BUG_ON(cpumask_first(p->cpus_ptr) != cpu); if (!cpumask_test_cpu(cpu, &info->cpumask)) return -EINVAL; @@ -621,17 +621,17 @@ static int hardwall_activate(struct hard * Deactivate a task's hardwall. Must hold lock for hardwall_type. * This method may be called from exit_thread(), so we don't want to * rely on too many fields of struct task_struct still being valid. - * We assume the cpus_allowed, pid, and comm fields are still valid. + * We assume the nr_cpus_allowed, pid, and comm fields are still valid. */ static void _hardwall_deactivate(struct hardwall_type *hwt, struct task_struct *task) { struct thread_struct *ts = &task->thread; - if (cpumask_weight(&task->cpus_allowed) != 1) { + if (task->nr_cpus_allowed != 1) { pr_err("pid %d (%s) releasing %s hardwall with an affinity mask containing %d cpus!\n", task->pid, task->comm, hwt->name, - cpumask_weight(&task->cpus_allowed)); + task->nr_cpus_allowed); BUG(); } Index: linux-4.14.15-rt12/arch/x86/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/Kconfig +++ linux-4.14.15-rt12/arch/x86/Kconfig @@ -169,6 +169,7 @@ config X86 select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && HAVE_PERF_EVENTS_NMI select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP + select HAVE_PREEMPT_LAZY select HAVE_RCU_TABLE_FREE select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RELIABLE_STACKTRACE if X86_64 && UNWINDER_FRAME_POINTER && STACK_VALIDATION @@ -255,8 +256,11 @@ config ARCH_MAY_HAVE_PC_FDC def_bool y depends on ISA_DMA_API +config RWSEM_GENERIC_SPINLOCK + def_bool PREEMPT_RT_FULL + config RWSEM_XCHGADD_ALGORITHM - def_bool y + def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL config GENERIC_CALIBRATE_DELAY def_bool y @@ -931,7 +935,7 @@ config IOMMU_HELPER config MAXSMP bool "Enable Maximum number of SMP Processors and NUMA Nodes" depends on X86_64 && SMP && DEBUG_KERNEL - select CPUMASK_OFFSTACK + select CPUMASK_OFFSTACK if !PREEMPT_RT_FULL ---help--- Enable maximum number of CPUS and NUMA Nodes for this architecture. If unsure, say N. Index: linux-4.14.15-rt12/arch/x86/crypto/aesni-intel_glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/aesni-intel_glue.c +++ linux-4.14.15-rt12/arch/x86/crypto/aesni-intel_glue.c @@ -387,14 +387,14 @@ static int ecb_encrypt(struct skcipher_r err = skcipher_walk_virt(&walk, req, true); - kernel_fpu_begin(); while ((nbytes = walk.nbytes)) { + kernel_fpu_begin(); aesni_ecb_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes & AES_BLOCK_MASK); + kernel_fpu_end(); nbytes &= AES_BLOCK_SIZE - 1; err = skcipher_walk_done(&walk, nbytes); } - kernel_fpu_end(); return err; } @@ -409,14 +409,14 @@ static int ecb_decrypt(struct skcipher_r err = skcipher_walk_virt(&walk, req, true); - kernel_fpu_begin(); while ((nbytes = walk.nbytes)) { + kernel_fpu_begin(); aesni_ecb_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes & AES_BLOCK_MASK); + kernel_fpu_end(); nbytes &= AES_BLOCK_SIZE - 1; err = skcipher_walk_done(&walk, nbytes); } - kernel_fpu_end(); return err; } @@ -431,14 +431,14 @@ static int cbc_encrypt(struct skcipher_r err = skcipher_walk_virt(&walk, req, true); - kernel_fpu_begin(); while ((nbytes = walk.nbytes)) { + kernel_fpu_begin(); aesni_cbc_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes & AES_BLOCK_MASK, walk.iv); + kernel_fpu_end(); nbytes &= AES_BLOCK_SIZE - 1; err = skcipher_walk_done(&walk, nbytes); } - kernel_fpu_end(); return err; } @@ -453,14 +453,14 @@ static int cbc_decrypt(struct skcipher_r err = skcipher_walk_virt(&walk, req, true); - kernel_fpu_begin(); while ((nbytes = walk.nbytes)) { + kernel_fpu_begin(); aesni_cbc_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes & AES_BLOCK_MASK, walk.iv); + kernel_fpu_end(); nbytes &= AES_BLOCK_SIZE - 1; err = skcipher_walk_done(&walk, nbytes); } - kernel_fpu_end(); return err; } @@ -510,18 +510,20 @@ static int ctr_crypt(struct skcipher_req err = skcipher_walk_virt(&walk, req, true); - kernel_fpu_begin(); while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) { + kernel_fpu_begin(); aesni_ctr_enc_tfm(ctx, walk.dst.virt.addr, walk.src.virt.addr, nbytes & AES_BLOCK_MASK, walk.iv); + kernel_fpu_end(); nbytes &= AES_BLOCK_SIZE - 1; err = skcipher_walk_done(&walk, nbytes); } if (walk.nbytes) { + kernel_fpu_begin(); ctr_crypt_final(ctx, &walk); + kernel_fpu_end(); err = skcipher_walk_done(&walk, 0); } - kernel_fpu_end(); return err; } Index: linux-4.14.15-rt12/arch/x86/crypto/camellia_aesni_avx2_glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/camellia_aesni_avx2_glue.c +++ linux-4.14.15-rt12/arch/x86/crypto/camellia_aesni_avx2_glue.c @@ -206,6 +206,20 @@ struct crypt_priv { bool fpu_enabled; }; +#ifdef CONFIG_PREEMPT_RT_FULL +static void camellia_fpu_end_rt(struct crypt_priv *ctx) +{ + bool fpu_enabled = ctx->fpu_enabled; + + if (!fpu_enabled) + return; + camellia_fpu_end(fpu_enabled); + ctx->fpu_enabled = false; +} +#else +static void camellia_fpu_end_rt(struct crypt_priv *ctx) { } +#endif + static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) { const unsigned int bsize = CAMELLIA_BLOCK_SIZE; @@ -221,16 +235,19 @@ static void encrypt_callback(void *priv, } if (nbytes >= CAMELLIA_AESNI_PARALLEL_BLOCKS * bsize) { + kernel_fpu_resched(); camellia_ecb_enc_16way(ctx->ctx, srcdst, srcdst); srcdst += bsize * CAMELLIA_AESNI_PARALLEL_BLOCKS; nbytes -= bsize * CAMELLIA_AESNI_PARALLEL_BLOCKS; } while (nbytes >= CAMELLIA_PARALLEL_BLOCKS * bsize) { + kernel_fpu_resched(); camellia_enc_blk_2way(ctx->ctx, srcdst, srcdst); srcdst += bsize * CAMELLIA_PARALLEL_BLOCKS; nbytes -= bsize * CAMELLIA_PARALLEL_BLOCKS; } + camellia_fpu_end_rt(ctx); for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) camellia_enc_blk(ctx->ctx, srcdst, srcdst); @@ -251,16 +268,19 @@ static void decrypt_callback(void *priv, } if (nbytes >= CAMELLIA_AESNI_PARALLEL_BLOCKS * bsize) { + kernel_fpu_resched(); camellia_ecb_dec_16way(ctx->ctx, srcdst, srcdst); srcdst += bsize * CAMELLIA_AESNI_PARALLEL_BLOCKS; nbytes -= bsize * CAMELLIA_AESNI_PARALLEL_BLOCKS; } while (nbytes >= CAMELLIA_PARALLEL_BLOCKS * bsize) { + kernel_fpu_resched(); camellia_dec_blk_2way(ctx->ctx, srcdst, srcdst); srcdst += bsize * CAMELLIA_PARALLEL_BLOCKS; nbytes -= bsize * CAMELLIA_PARALLEL_BLOCKS; } + camellia_fpu_end_rt(ctx); for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) camellia_dec_blk(ctx->ctx, srcdst, srcdst); Index: linux-4.14.15-rt12/arch/x86/crypto/camellia_aesni_avx_glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/camellia_aesni_avx_glue.c +++ linux-4.14.15-rt12/arch/x86/crypto/camellia_aesni_avx_glue.c @@ -210,6 +210,21 @@ struct crypt_priv { bool fpu_enabled; }; +#ifdef CONFIG_PREEMPT_RT_FULL +static void camellia_fpu_end_rt(struct crypt_priv *ctx) +{ + bool fpu_enabled = ctx->fpu_enabled; + + if (!fpu_enabled) + return; + camellia_fpu_end(fpu_enabled); + ctx->fpu_enabled = false; +} + +#else +static void camellia_fpu_end_rt(struct crypt_priv *ctx) { } +#endif + static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) { const unsigned int bsize = CAMELLIA_BLOCK_SIZE; @@ -225,10 +240,12 @@ static void encrypt_callback(void *priv, } while (nbytes >= CAMELLIA_PARALLEL_BLOCKS * bsize) { + kernel_fpu_resched(); camellia_enc_blk_2way(ctx->ctx, srcdst, srcdst); srcdst += bsize * CAMELLIA_PARALLEL_BLOCKS; nbytes -= bsize * CAMELLIA_PARALLEL_BLOCKS; } + camellia_fpu_end_rt(ctx); for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) camellia_enc_blk(ctx->ctx, srcdst, srcdst); @@ -249,10 +266,12 @@ static void decrypt_callback(void *priv, } while (nbytes >= CAMELLIA_PARALLEL_BLOCKS * bsize) { + kernel_fpu_resched(); camellia_dec_blk_2way(ctx->ctx, srcdst, srcdst); srcdst += bsize * CAMELLIA_PARALLEL_BLOCKS; nbytes -= bsize * CAMELLIA_PARALLEL_BLOCKS; } + camellia_fpu_end_rt(ctx); for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) camellia_dec_blk(ctx->ctx, srcdst, srcdst); Index: linux-4.14.15-rt12/arch/x86/crypto/cast5_avx_glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/cast5_avx_glue.c +++ linux-4.14.15-rt12/arch/x86/crypto/cast5_avx_glue.c @@ -59,7 +59,7 @@ static inline void cast5_fpu_end(bool fp static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk, bool enc) { - bool fpu_enabled = false; + bool fpu_enabled; struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); const unsigned int bsize = CAST5_BLOCK_SIZE; unsigned int nbytes; @@ -75,7 +75,7 @@ static int ecb_crypt(struct blkcipher_de u8 *wsrc = walk->src.virt.addr; u8 *wdst = walk->dst.virt.addr; - fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes); + fpu_enabled = cast5_fpu_begin(false, nbytes); /* Process multi-block batch */ if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) { @@ -103,10 +103,9 @@ static int ecb_crypt(struct blkcipher_de } while (nbytes >= bsize); done: + cast5_fpu_end(fpu_enabled); err = blkcipher_walk_done(desc, walk, nbytes); } - - cast5_fpu_end(fpu_enabled); return err; } @@ -227,7 +226,7 @@ done: static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { - bool fpu_enabled = false; + bool fpu_enabled; struct blkcipher_walk walk; int err; @@ -236,12 +235,11 @@ static int cbc_decrypt(struct blkcipher_ desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; while ((nbytes = walk.nbytes)) { - fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes); + fpu_enabled = cast5_fpu_begin(false, nbytes); nbytes = __cbc_decrypt(desc, &walk); + cast5_fpu_end(fpu_enabled); err = blkcipher_walk_done(desc, &walk, nbytes); } - - cast5_fpu_end(fpu_enabled); return err; } @@ -310,7 +308,7 @@ done: static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { - bool fpu_enabled = false; + bool fpu_enabled; struct blkcipher_walk walk; int err; @@ -319,13 +317,12 @@ static int ctr_crypt(struct blkcipher_de desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) { - fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes); + fpu_enabled = cast5_fpu_begin(false, nbytes); nbytes = __ctr_crypt(desc, &walk); + cast5_fpu_end(fpu_enabled); err = blkcipher_walk_done(desc, &walk, nbytes); } - cast5_fpu_end(fpu_enabled); - if (walk.nbytes) { ctr_crypt_final(desc, &walk); err = blkcipher_walk_done(desc, &walk, 0); Index: linux-4.14.15-rt12/arch/x86/crypto/cast6_avx_glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/cast6_avx_glue.c +++ linux-4.14.15-rt12/arch/x86/crypto/cast6_avx_glue.c @@ -205,19 +205,33 @@ struct crypt_priv { bool fpu_enabled; }; +#ifdef CONFIG_PREEMPT_RT_FULL +static void cast6_fpu_end_rt(struct crypt_priv *ctx) +{ + bool fpu_enabled = ctx->fpu_enabled; + + if (!fpu_enabled) + return; + cast6_fpu_end(fpu_enabled); + ctx->fpu_enabled = false; +} + +#else +static void cast6_fpu_end_rt(struct crypt_priv *ctx) { } +#endif + static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) { const unsigned int bsize = CAST6_BLOCK_SIZE; struct crypt_priv *ctx = priv; int i; - ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes); - if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) { + ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes); cast6_ecb_enc_8way(ctx->ctx, srcdst, srcdst); + cast6_fpu_end_rt(ctx); return; } - for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) __cast6_encrypt(ctx->ctx, srcdst, srcdst); } @@ -228,10 +242,10 @@ static void decrypt_callback(void *priv, struct crypt_priv *ctx = priv; int i; - ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes); - if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) { + ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes); cast6_ecb_dec_8way(ctx->ctx, srcdst, srcdst); + cast6_fpu_end_rt(ctx); return; } Index: linux-4.14.15-rt12/arch/x86/crypto/chacha20_glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/chacha20_glue.c +++ linux-4.14.15-rt12/arch/x86/crypto/chacha20_glue.c @@ -81,23 +81,24 @@ static int chacha20_simd(struct skcipher crypto_chacha20_init(state, ctx, walk.iv); - kernel_fpu_begin(); - while (walk.nbytes >= CHACHA20_BLOCK_SIZE) { + kernel_fpu_begin(); + chacha20_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr, rounddown(walk.nbytes, CHACHA20_BLOCK_SIZE)); + kernel_fpu_end(); err = skcipher_walk_done(&walk, walk.nbytes % CHACHA20_BLOCK_SIZE); } if (walk.nbytes) { + kernel_fpu_begin(); chacha20_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr, walk.nbytes); + kernel_fpu_end(); err = skcipher_walk_done(&walk, 0); } - kernel_fpu_end(); - return err; } Index: linux-4.14.15-rt12/arch/x86/crypto/glue_helper.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/glue_helper.c +++ linux-4.14.15-rt12/arch/x86/crypto/glue_helper.c @@ -40,7 +40,7 @@ static int __glue_ecb_crypt_128bit(const void *ctx = crypto_blkcipher_ctx(desc->tfm); const unsigned int bsize = 128 / 8; unsigned int nbytes, i, func_bytes; - bool fpu_enabled = false; + bool fpu_enabled; int err; err = blkcipher_walk_virt(desc, walk); @@ -50,7 +50,7 @@ static int __glue_ecb_crypt_128bit(const u8 *wdst = walk->dst.virt.addr; fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, - desc, fpu_enabled, nbytes); + desc, false, nbytes); for (i = 0; i < gctx->num_funcs; i++) { func_bytes = bsize * gctx->funcs[i].num_blocks; @@ -72,10 +72,10 @@ static int __glue_ecb_crypt_128bit(const } done: + glue_fpu_end(fpu_enabled); err = blkcipher_walk_done(desc, walk, nbytes); } - glue_fpu_end(fpu_enabled); return err; } @@ -192,7 +192,7 @@ int glue_cbc_decrypt_128bit(const struct struct scatterlist *src, unsigned int nbytes) { const unsigned int bsize = 128 / 8; - bool fpu_enabled = false; + bool fpu_enabled; struct blkcipher_walk walk; int err; @@ -201,12 +201,12 @@ int glue_cbc_decrypt_128bit(const struct while ((nbytes = walk.nbytes)) { fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, - desc, fpu_enabled, nbytes); + desc, false, nbytes); nbytes = __glue_cbc_decrypt_128bit(gctx, desc, &walk); + glue_fpu_end(fpu_enabled); err = blkcipher_walk_done(desc, &walk, nbytes); } - glue_fpu_end(fpu_enabled); return err; } EXPORT_SYMBOL_GPL(glue_cbc_decrypt_128bit); @@ -275,7 +275,7 @@ int glue_ctr_crypt_128bit(const struct c struct scatterlist *src, unsigned int nbytes) { const unsigned int bsize = 128 / 8; - bool fpu_enabled = false; + bool fpu_enabled; struct blkcipher_walk walk; int err; @@ -284,13 +284,12 @@ int glue_ctr_crypt_128bit(const struct c while ((nbytes = walk.nbytes) >= bsize) { fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, - desc, fpu_enabled, nbytes); + desc, false, nbytes); nbytes = __glue_ctr_crypt_128bit(gctx, desc, &walk); + glue_fpu_end(fpu_enabled); err = blkcipher_walk_done(desc, &walk, nbytes); } - glue_fpu_end(fpu_enabled); - if (walk.nbytes) { glue_ctr_crypt_final_128bit( gctx->funcs[gctx->num_funcs - 1].fn_u.ctr, desc, &walk); @@ -380,7 +379,7 @@ int glue_xts_crypt_128bit(const struct c void *tweak_ctx, void *crypt_ctx) { const unsigned int bsize = 128 / 8; - bool fpu_enabled = false; + bool fpu_enabled; struct blkcipher_walk walk; int err; @@ -393,21 +392,21 @@ int glue_xts_crypt_128bit(const struct c /* set minimum length to bsize, for tweak_fn */ fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, - desc, fpu_enabled, + desc, false, nbytes < bsize ? bsize : nbytes); - /* calculate first value of T */ tweak_fn(tweak_ctx, walk.iv, walk.iv); + glue_fpu_end(fpu_enabled); while (nbytes) { + fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit, + desc, false, nbytes); nbytes = __glue_xts_crypt_128bit(gctx, crypt_ctx, desc, &walk); + glue_fpu_end(fpu_enabled); err = blkcipher_walk_done(desc, &walk, nbytes); nbytes = walk.nbytes; } - - glue_fpu_end(fpu_enabled); - return err; } EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit); Index: linux-4.14.15-rt12/arch/x86/crypto/serpent_avx2_glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/serpent_avx2_glue.c +++ linux-4.14.15-rt12/arch/x86/crypto/serpent_avx2_glue.c @@ -184,6 +184,21 @@ struct crypt_priv { bool fpu_enabled; }; +#ifdef CONFIG_PREEMPT_RT_FULL +static void serpent_fpu_end_rt(struct crypt_priv *ctx) +{ + bool fpu_enabled = ctx->fpu_enabled; + + if (!fpu_enabled) + return; + serpent_fpu_end(fpu_enabled); + ctx->fpu_enabled = false; +} + +#else +static void serpent_fpu_end_rt(struct crypt_priv *ctx) { } +#endif + static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) { const unsigned int bsize = SERPENT_BLOCK_SIZE; @@ -199,10 +214,12 @@ static void encrypt_callback(void *priv, } while (nbytes >= SERPENT_PARALLEL_BLOCKS * bsize) { + kernel_fpu_resched(); serpent_ecb_enc_8way_avx(ctx->ctx, srcdst, srcdst); srcdst += bsize * SERPENT_PARALLEL_BLOCKS; nbytes -= bsize * SERPENT_PARALLEL_BLOCKS; } + serpent_fpu_end_rt(ctx); for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) __serpent_encrypt(ctx->ctx, srcdst, srcdst); @@ -223,10 +240,12 @@ static void decrypt_callback(void *priv, } while (nbytes >= SERPENT_PARALLEL_BLOCKS * bsize) { + kernel_fpu_resched(); serpent_ecb_dec_8way_avx(ctx->ctx, srcdst, srcdst); srcdst += bsize * SERPENT_PARALLEL_BLOCKS; nbytes -= bsize * SERPENT_PARALLEL_BLOCKS; } + serpent_fpu_end_rt(ctx); for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) __serpent_decrypt(ctx->ctx, srcdst, srcdst); Index: linux-4.14.15-rt12/arch/x86/crypto/serpent_avx_glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/serpent_avx_glue.c +++ linux-4.14.15-rt12/arch/x86/crypto/serpent_avx_glue.c @@ -218,16 +218,31 @@ struct crypt_priv { bool fpu_enabled; }; +#ifdef CONFIG_PREEMPT_RT_FULL +static void serpent_fpu_end_rt(struct crypt_priv *ctx) +{ + bool fpu_enabled = ctx->fpu_enabled; + + if (!fpu_enabled) + return; + serpent_fpu_end(fpu_enabled); + ctx->fpu_enabled = false; +} + +#else +static void serpent_fpu_end_rt(struct crypt_priv *ctx) { } +#endif + static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) { const unsigned int bsize = SERPENT_BLOCK_SIZE; struct crypt_priv *ctx = priv; int i; - ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes); - if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) { + ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes); serpent_ecb_enc_8way_avx(ctx->ctx, srcdst, srcdst); + serpent_fpu_end_rt(ctx); return; } @@ -241,10 +256,10 @@ static void decrypt_callback(void *priv, struct crypt_priv *ctx = priv; int i; - ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes); - if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) { + ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes); serpent_ecb_dec_8way_avx(ctx->ctx, srcdst, srcdst); + serpent_fpu_end_rt(ctx); return; } Index: linux-4.14.15-rt12/arch/x86/crypto/serpent_sse2_glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/serpent_sse2_glue.c +++ linux-4.14.15-rt12/arch/x86/crypto/serpent_sse2_glue.c @@ -187,16 +187,31 @@ struct crypt_priv { bool fpu_enabled; }; +#ifdef CONFIG_PREEMPT_RT_FULL +static void serpent_fpu_end_rt(struct crypt_priv *ctx) +{ + bool fpu_enabled = ctx->fpu_enabled; + + if (!fpu_enabled) + return; + serpent_fpu_end(fpu_enabled); + ctx->fpu_enabled = false; +} + +#else +static void serpent_fpu_end_rt(struct crypt_priv *ctx) { } +#endif + static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) { const unsigned int bsize = SERPENT_BLOCK_SIZE; struct crypt_priv *ctx = priv; int i; - ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes); - if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) { + ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes); serpent_enc_blk_xway(ctx->ctx, srcdst, srcdst); + serpent_fpu_end_rt(ctx); return; } @@ -210,10 +225,10 @@ static void decrypt_callback(void *priv, struct crypt_priv *ctx = priv; int i; - ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes); - if (nbytes == bsize * SERPENT_PARALLEL_BLOCKS) { + ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes); serpent_dec_blk_xway(ctx->ctx, srcdst, srcdst); + serpent_fpu_end_rt(ctx); return; } Index: linux-4.14.15-rt12/arch/x86/crypto/twofish_avx_glue.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/crypto/twofish_avx_glue.c +++ linux-4.14.15-rt12/arch/x86/crypto/twofish_avx_glue.c @@ -218,6 +218,21 @@ struct crypt_priv { bool fpu_enabled; }; +#ifdef CONFIG_PREEMPT_RT_FULL +static void twofish_fpu_end_rt(struct crypt_priv *ctx) +{ + bool fpu_enabled = ctx->fpu_enabled; + + if (!fpu_enabled) + return; + twofish_fpu_end(fpu_enabled); + ctx->fpu_enabled = false; +} + +#else +static void twofish_fpu_end_rt(struct crypt_priv *ctx) { } +#endif + static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes) { const unsigned int bsize = TF_BLOCK_SIZE; @@ -228,12 +243,16 @@ static void encrypt_callback(void *priv, if (nbytes == bsize * TWOFISH_PARALLEL_BLOCKS) { twofish_ecb_enc_8way(ctx->ctx, srcdst, srcdst); + twofish_fpu_end_rt(ctx); return; } - for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3) + for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3) { + kernel_fpu_resched(); twofish_enc_blk_3way(ctx->ctx, srcdst, srcdst); + } + twofish_fpu_end_rt(ctx); nbytes %= bsize * 3; for (i = 0; i < nbytes / bsize; i++, srcdst += bsize) @@ -250,11 +269,15 @@ static void decrypt_callback(void *priv, if (nbytes == bsize * TWOFISH_PARALLEL_BLOCKS) { twofish_ecb_dec_8way(ctx->ctx, srcdst, srcdst); + twofish_fpu_end_rt(ctx); return; } - for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3) + for (i = 0; i < nbytes / (bsize * 3); i++, srcdst += bsize * 3) { + kernel_fpu_resched(); twofish_dec_blk_3way(ctx->ctx, srcdst, srcdst); + } + twofish_fpu_end_rt(ctx); nbytes %= bsize * 3; Index: linux-4.14.15-rt12/arch/x86/entry/common.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/entry/common.c +++ linux-4.14.15-rt12/arch/x86/entry/common.c @@ -133,7 +133,7 @@ static long syscall_trace_enter(struct p #define EXIT_TO_USERMODE_LOOP_FLAGS \ (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ - _TIF_NEED_RESCHED | _TIF_USER_RETURN_NOTIFY | _TIF_PATCH_PENDING) + _TIF_NEED_RESCHED_MASK | _TIF_USER_RETURN_NOTIFY | _TIF_PATCH_PENDING) static void exit_to_usermode_loop(struct pt_regs *regs, u32 cached_flags) { @@ -148,9 +148,16 @@ static void exit_to_usermode_loop(struct /* We have work to do. */ local_irq_enable(); - if (cached_flags & _TIF_NEED_RESCHED) + if (cached_flags & _TIF_NEED_RESCHED_MASK) schedule(); +#ifdef ARCH_RT_DELAYS_SIGNAL_SEND + if (unlikely(current->forced_info.si_signo)) { + struct task_struct *t = current; + force_sig_info(t->forced_info.si_signo, &t->forced_info, t); + t->forced_info.si_signo = 0; + } +#endif if (cached_flags & _TIF_UPROBE) uprobe_notify_resume(regs); Index: linux-4.14.15-rt12/arch/x86/entry/entry_32.S =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/entry/entry_32.S +++ linux-4.14.15-rt12/arch/x86/entry/entry_32.S @@ -350,8 +350,25 @@ END(ret_from_exception) ENTRY(resume_kernel) DISABLE_INTERRUPTS(CLBR_ANY) .Lneed_resched: + # preempt count == 0 + NEED_RS set? cmpl $0, PER_CPU_VAR(__preempt_count) +#ifndef CONFIG_PREEMPT_LAZY jnz restore_all +#else + jz test_int_off + + # atleast preempt count == 0 ? + cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count) + jne restore_all + + movl PER_CPU_VAR(current_task), %ebp + cmpl $0,TASK_TI_preempt_lazy_count(%ebp) # non-zero preempt_lazy_count ? + jnz restore_all + + testl $_TIF_NEED_RESCHED_LAZY, TASK_TI_flags(%ebp) + jz restore_all +test_int_off: +#endif testl $X86_EFLAGS_IF, PT_EFLAGS(%esp) # interrupts off (exception path) ? jz restore_all call preempt_schedule_irq Index: linux-4.14.15-rt12/arch/x86/entry/entry_64.S =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/entry/entry_64.S +++ linux-4.14.15-rt12/arch/x86/entry/entry_64.S @@ -633,7 +633,23 @@ retint_kernel: bt $9, EFLAGS(%rsp) /* were interrupts off? */ jnc 1f 0: cmpl $0, PER_CPU_VAR(__preempt_count) +#ifndef CONFIG_PREEMPT_LAZY jnz 1f +#else + jz do_preempt_schedule_irq + + # atleast preempt count == 0 ? + cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count) + jnz 1f + + movq PER_CPU_VAR(current_task), %rcx + cmpl $0, TASK_TI_preempt_lazy_count(%rcx) + jnz 1f + + bt $TIF_NEED_RESCHED_LAZY,TASK_TI_flags(%rcx) + jnc 1f +do_preempt_schedule_irq: +#endif call preempt_schedule_irq jmp 0b 1: @@ -988,6 +1004,7 @@ bad_gs: jmp 2b .previous +#ifndef CONFIG_PREEMPT_RT_FULL /* Call softirq on interrupt stack. Interrupts are off. */ ENTRY(do_softirq_own_stack) pushq %rbp @@ -998,6 +1015,7 @@ ENTRY(do_softirq_own_stack) leaveq ret ENDPROC(do_softirq_own_stack) +#endif #ifdef CONFIG_XEN idtentry hypervisor_callback xen_do_hypervisor_callback has_error_code=0 Index: linux-4.14.15-rt12/arch/x86/include/asm/fpu/api.h =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/include/asm/fpu/api.h +++ linux-4.14.15-rt12/arch/x86/include/asm/fpu/api.h @@ -25,6 +25,7 @@ extern void __kernel_fpu_begin(void); extern void __kernel_fpu_end(void); extern void kernel_fpu_begin(void); extern void kernel_fpu_end(void); +extern void kernel_fpu_resched(void); extern bool irq_fpu_usable(void); /* Index: linux-4.14.15-rt12/arch/x86/include/asm/preempt.h =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/include/asm/preempt.h +++ linux-4.14.15-rt12/arch/x86/include/asm/preempt.h @@ -86,17 +86,46 @@ static __always_inline void __preempt_co * a decrement which hits zero means we have no preempt_count and should * reschedule. */ -static __always_inline bool __preempt_count_dec_and_test(void) +static __always_inline bool ____preempt_count_dec_and_test(void) { GEN_UNARY_RMWcc("decl", __preempt_count, __percpu_arg(0), e); } +static __always_inline bool __preempt_count_dec_and_test(void) +{ + if (____preempt_count_dec_and_test()) + return true; +#ifdef CONFIG_PREEMPT_LAZY + if (current_thread_info()->preempt_lazy_count) + return false; + return test_thread_flag(TIF_NEED_RESCHED_LAZY); +#else + return false; +#endif +} + /* * Returns true when we need to resched and can (barring IRQ state). */ static __always_inline bool should_resched(int preempt_offset) { +#ifdef CONFIG_PREEMPT_LAZY + u32 tmp; + + tmp = raw_cpu_read_4(__preempt_count); + if (tmp == preempt_offset) + return true; + + /* preempt count == 0 ? */ + tmp &= ~PREEMPT_NEED_RESCHED; + if (tmp) + return false; + if (current_thread_info()->preempt_lazy_count) + return false; + return test_thread_flag(TIF_NEED_RESCHED_LAZY); +#else return unlikely(raw_cpu_read_4(__preempt_count) == preempt_offset); +#endif } #ifdef CONFIG_PREEMPT Index: linux-4.14.15-rt12/arch/x86/include/asm/signal.h =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/include/asm/signal.h +++ linux-4.14.15-rt12/arch/x86/include/asm/signal.h @@ -28,6 +28,19 @@ typedef struct { #define SA_IA32_ABI 0x02000000u #define SA_X32_ABI 0x01000000u +/* + * Because some traps use the IST stack, we must keep preemption + * disabled while calling do_trap(), but do_trap() may call + * force_sig_info() which will grab the signal spin_locks for the + * task, which in PREEMPT_RT_FULL are mutexes. By defining + * ARCH_RT_DELAYS_SIGNAL_SEND the force_sig_info() will set + * TIF_NOTIFY_RESUME and set up the signal to be sent on exit of the + * trap. + */ +#if defined(CONFIG_PREEMPT_RT_FULL) +#define ARCH_RT_DELAYS_SIGNAL_SEND +#endif + #ifndef CONFIG_COMPAT typedef sigset_t compat_sigset_t; #endif Index: linux-4.14.15-rt12/arch/x86/include/asm/stackprotector.h =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/include/asm/stackprotector.h +++ linux-4.14.15-rt12/arch/x86/include/asm/stackprotector.h @@ -60,7 +60,7 @@ */ static __always_inline void boot_init_stack_canary(void) { - u64 canary; + u64 uninitialized_var(canary); u64 tsc; #ifdef CONFIG_X86_64 @@ -71,8 +71,14 @@ static __always_inline void boot_init_st * of randomness. The TSC only matters for very early init, * there it already has some randomness on most systems. Later * on during the bootup the random pool has true entropy too. + * For preempt-rt we need to weaken the randomness a bit, as + * we can't call into the random generator from atomic context + * due to locking constraints. We just leave canary + * uninitialized and use the TSC based randomness on top of it. */ +#ifndef CONFIG_PREEMPT_RT_FULL get_random_bytes(&canary, sizeof(canary)); +#endif tsc = rdtsc(); canary += tsc + (tsc << 32UL); canary &= CANARY_MASK; Index: linux-4.14.15-rt12/arch/x86/include/asm/thread_info.h =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/include/asm/thread_info.h +++ linux-4.14.15-rt12/arch/x86/include/asm/thread_info.h @@ -56,11 +56,14 @@ struct task_struct; struct thread_info { unsigned long flags; /* low level flags */ u32 status; /* thread synchronous flags */ + int preempt_lazy_count; /* 0 => lazy preemptable + <0 => BUG */ }; #define INIT_THREAD_INFO(tsk) \ { \ .flags = 0, \ + .preempt_lazy_count = 0, \ } #define init_stack (init_thread_union.stack) @@ -69,6 +72,10 @@ struct thread_info { #include +#define GET_THREAD_INFO(reg) \ + _ASM_MOV PER_CPU_VAR(cpu_current_top_of_stack),reg ; \ + _ASM_SUB $(THREAD_SIZE),reg ; + #endif /* @@ -84,6 +91,7 @@ struct thread_info { #define TIF_SYSCALL_EMU 6 /* syscall emulation active */ #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ #define TIF_SECCOMP 8 /* secure computing */ +#define TIF_NEED_RESCHED_LAZY 9 /* lazy rescheduling necessary */ #define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */ #define TIF_UPROBE 12 /* breakpointed or singlestepping */ #define TIF_PATCH_PENDING 13 /* pending live patching update */ @@ -110,6 +118,7 @@ struct thread_info { #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_SECCOMP (1 << TIF_SECCOMP) +#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY) #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY) #define _TIF_UPROBE (1 << TIF_UPROBE) #define _TIF_PATCH_PENDING (1 << TIF_PATCH_PENDING) @@ -151,6 +160,8 @@ struct thread_info { #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY) #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW) +#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY) + #define STACK_WARN (THREAD_SIZE/8) /* Index: linux-4.14.15-rt12/arch/x86/include/asm/uv/uv_bau.h =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/include/asm/uv/uv_bau.h +++ linux-4.14.15-rt12/arch/x86/include/asm/uv/uv_bau.h @@ -643,9 +643,9 @@ struct bau_control { cycles_t send_message; cycles_t period_end; cycles_t period_time; - spinlock_t uvhub_lock; - spinlock_t queue_lock; - spinlock_t disable_lock; + raw_spinlock_t uvhub_lock; + raw_spinlock_t queue_lock; + raw_spinlock_t disable_lock; /* tunables */ int max_concurr; int max_concurr_const; @@ -847,15 +847,15 @@ static inline int atom_asr(short i, stru * to be lowered below the current 'v'. atomic_add_unless can only stop * on equal. */ -static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u) +static inline int atomic_inc_unless_ge(raw_spinlock_t *lock, atomic_t *v, int u) { - spin_lock(lock); + raw_spin_lock(lock); if (atomic_read(v) >= u) { - spin_unlock(lock); + raw_spin_unlock(lock); return 0; } atomic_inc(v); - spin_unlock(lock); + raw_spin_unlock(lock); return 1; } Index: linux-4.14.15-rt12/arch/x86/kernel/apic/io_apic.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/kernel/apic/io_apic.c +++ linux-4.14.15-rt12/arch/x86/kernel/apic/io_apic.c @@ -1690,7 +1690,8 @@ static bool io_apic_level_ack_pending(st static inline bool ioapic_irqd_mask(struct irq_data *data) { /* If we are moving the irq we need to mask it */ - if (unlikely(irqd_is_setaffinity_pending(data))) { + if (unlikely(irqd_is_setaffinity_pending(data) && + !irqd_irq_inprogress(data))) { mask_ioapic_irq(data); return true; } Index: linux-4.14.15-rt12/arch/x86/kernel/asm-offsets.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/kernel/asm-offsets.c +++ linux-4.14.15-rt12/arch/x86/kernel/asm-offsets.c @@ -38,6 +38,7 @@ void common(void) { BLANK(); OFFSET(TASK_TI_flags, task_struct, thread_info.flags); + OFFSET(TASK_TI_preempt_lazy_count, task_struct, thread_info.preempt_lazy_count); OFFSET(TASK_addr_limit, task_struct, thread.addr_limit); BLANK(); @@ -94,6 +95,7 @@ void common(void) { BLANK(); DEFINE(PTREGS_SIZE, sizeof(struct pt_regs)); + DEFINE(_PREEMPT_ENABLED, PREEMPT_ENABLED); /* TLB state for the entry code */ OFFSET(TLB_STATE_user_pcid_flush_mask, tlb_state, user_pcid_flush_mask); Index: linux-4.14.15-rt12/arch/x86/kernel/cpu/mcheck/dev-mcelog.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/kernel/cpu/mcheck/dev-mcelog.c +++ linux-4.14.15-rt12/arch/x86/kernel/cpu/mcheck/dev-mcelog.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "mce-internal.h" @@ -86,13 +87,43 @@ static void mce_do_trigger(struct work_s static DECLARE_WORK(mce_trigger_work, mce_do_trigger); - -void mce_work_trigger(void) +static void __mce_work_trigger(struct swork_event *event) { if (mce_helper[0]) schedule_work(&mce_trigger_work); } +#ifdef CONFIG_PREEMPT_RT_FULL +static bool notify_work_ready __read_mostly; +static struct swork_event notify_work; + +static int mce_notify_work_init(void) +{ + int err; + + err = swork_get(); + if (err) + return err; + + INIT_SWORK(¬ify_work, __mce_work_trigger); + notify_work_ready = true; + return 0; +} + +void mce_work_trigger(void) +{ + if (notify_work_ready) + swork_queue(¬ify_work); +} + +#else +void mce_work_trigger(void) +{ + __mce_work_trigger(NULL); +} +static inline int mce_notify_work_init(void) { return 0; } +#endif + static ssize_t show_trigger(struct device *s, struct device_attribute *attr, char *buf) { @@ -356,7 +387,7 @@ static __init int dev_mcelog_init_device return err; } - + mce_notify_work_init(); mce_register_decode_chain(&dev_mcelog_nb); return 0; } Index: linux-4.14.15-rt12/arch/x86/kernel/cpu/mcheck/mce.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/kernel/cpu/mcheck/mce.c +++ linux-4.14.15-rt12/arch/x86/kernel/cpu/mcheck/mce.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include @@ -1355,7 +1356,7 @@ int memory_failure(unsigned long pfn, in static unsigned long check_interval = INITIAL_CHECK_INTERVAL; static DEFINE_PER_CPU(unsigned long, mce_next_interval); /* in jiffies */ -static DEFINE_PER_CPU(struct timer_list, mce_timer); +static DEFINE_PER_CPU(struct hrtimer, mce_timer); static unsigned long mce_adjust_timer_default(unsigned long interval) { @@ -1364,27 +1365,19 @@ static unsigned long mce_adjust_timer_de static unsigned long (*mce_adjust_timer)(unsigned long interval) = mce_adjust_timer_default; -static void __start_timer(struct timer_list *t, unsigned long interval) +static void __start_timer(struct hrtimer *t, unsigned long iv) { - unsigned long when = jiffies + interval; - unsigned long flags; - - local_irq_save(flags); - - if (!timer_pending(t) || time_before(when, t->expires)) - mod_timer(t, round_jiffies(when)); + if (!iv) + return; - local_irq_restore(flags); + hrtimer_start_range_ns(t, ns_to_ktime(jiffies_to_usecs(iv) * 1000ULL), + 0, HRTIMER_MODE_REL_PINNED); } -static void mce_timer_fn(unsigned long data) +static enum hrtimer_restart mce_timer_fn(struct hrtimer *timer) { - struct timer_list *t = this_cpu_ptr(&mce_timer); - int cpu = smp_processor_id(); unsigned long iv; - WARN_ON(cpu != data); - iv = __this_cpu_read(mce_next_interval); if (mce_available(this_cpu_ptr(&cpu_info))) { @@ -1407,7 +1400,11 @@ static void mce_timer_fn(unsigned long d done: __this_cpu_write(mce_next_interval, iv); - __start_timer(t, iv); + if (!iv) + return HRTIMER_NORESTART; + + hrtimer_forward_now(timer, ns_to_ktime(jiffies_to_nsecs(iv))); + return HRTIMER_RESTART; } /* @@ -1415,7 +1412,7 @@ done: */ void mce_timer_kick(unsigned long interval) { - struct timer_list *t = this_cpu_ptr(&mce_timer); + struct hrtimer *t = this_cpu_ptr(&mce_timer); unsigned long iv = __this_cpu_read(mce_next_interval); __start_timer(t, interval); @@ -1430,7 +1427,7 @@ static void mce_timer_delete_all(void) int cpu; for_each_online_cpu(cpu) - del_timer_sync(&per_cpu(mce_timer, cpu)); + hrtimer_cancel(&per_cpu(mce_timer, cpu)); } /* @@ -1759,7 +1756,7 @@ static void __mcheck_cpu_clear_vendor(st } } -static void mce_start_timer(struct timer_list *t) +static void mce_start_timer(struct hrtimer *t) { unsigned long iv = check_interval * HZ; @@ -1772,18 +1769,19 @@ static void mce_start_timer(struct timer static void __mcheck_cpu_setup_timer(void) { - struct timer_list *t = this_cpu_ptr(&mce_timer); - unsigned int cpu = smp_processor_id(); + struct hrtimer *t = this_cpu_ptr(&mce_timer); - setup_pinned_timer(t, mce_timer_fn, cpu); + hrtimer_init(t, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + t->function = mce_timer_fn; } static void __mcheck_cpu_init_timer(void) { - struct timer_list *t = this_cpu_ptr(&mce_timer); - unsigned int cpu = smp_processor_id(); + struct hrtimer *t = this_cpu_ptr(&mce_timer); + + hrtimer_init(t, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + t->function = mce_timer_fn; - setup_pinned_timer(t, mce_timer_fn, cpu); mce_start_timer(t); } @@ -2302,7 +2300,7 @@ static int mce_cpu_dead(unsigned int cpu static int mce_cpu_online(unsigned int cpu) { - struct timer_list *t = this_cpu_ptr(&mce_timer); + struct hrtimer *t = this_cpu_ptr(&mce_timer); int ret; mce_device_create(cpu); @@ -2319,10 +2317,10 @@ static int mce_cpu_online(unsigned int c static int mce_cpu_pre_down(unsigned int cpu) { - struct timer_list *t = this_cpu_ptr(&mce_timer); + struct hrtimer *t = this_cpu_ptr(&mce_timer); mce_disable_cpu(); - del_timer_sync(t); + hrtimer_cancel(t); mce_threshold_remove_device(cpu); mce_device_remove(cpu); return 0; Index: linux-4.14.15-rt12/arch/x86/kernel/fpu/core.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/kernel/fpu/core.c +++ linux-4.14.15-rt12/arch/x86/kernel/fpu/core.c @@ -137,6 +137,18 @@ void kernel_fpu_end(void) } EXPORT_SYMBOL_GPL(kernel_fpu_end); +void kernel_fpu_resched(void) +{ + WARN_ON_FPU(!this_cpu_read(in_kernel_fpu)); + + if (should_resched(PREEMPT_OFFSET)) { + kernel_fpu_end(); + cond_resched(); + kernel_fpu_begin(); + } +} +EXPORT_SYMBOL_GPL(kernel_fpu_resched); + /* * Save the FPU state (mark it for reload if necessary): * Index: linux-4.14.15-rt12/arch/x86/kernel/irq_32.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/kernel/irq_32.c +++ linux-4.14.15-rt12/arch/x86/kernel/irq_32.c @@ -129,6 +129,7 @@ void irq_ctx_init(int cpu) cpu, per_cpu(hardirq_stack, cpu), per_cpu(softirq_stack, cpu)); } +#ifndef CONFIG_PREEMPT_RT_FULL void do_softirq_own_stack(void) { struct irq_stack *irqstk; @@ -145,6 +146,7 @@ void do_softirq_own_stack(void) call_on_stack(__do_softirq, isp); } +#endif bool handle_irq(struct irq_desc *desc, struct pt_regs *regs) { Index: linux-4.14.15-rt12/arch/x86/kernel/process_32.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/kernel/process_32.c +++ linux-4.14.15-rt12/arch/x86/kernel/process_32.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include @@ -198,6 +199,35 @@ start_thread(struct pt_regs *regs, unsig } EXPORT_SYMBOL_GPL(start_thread); +#ifdef CONFIG_PREEMPT_RT_FULL +static void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) +{ + int i; + + /* + * Clear @prev's kmap_atomic mappings + */ + for (i = 0; i < prev_p->kmap_idx; i++) { + int idx = i + KM_TYPE_NR * smp_processor_id(); + pte_t *ptep = kmap_pte - idx; + + kpte_clear_flush(ptep, __fix_to_virt(FIX_KMAP_BEGIN + idx)); + } + /* + * Restore @next_p's kmap_atomic mappings + */ + for (i = 0; i < next_p->kmap_idx; i++) { + int idx = i + KM_TYPE_NR * smp_processor_id(); + + if (!pte_none(next_p->kmap_pte[i])) + set_pte(kmap_pte - idx, next_p->kmap_pte[i]); + } +} +#else +static inline void +switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) { } +#endif + /* * switch_to(x,y) should switch tasks from x to y. @@ -273,6 +303,8 @@ __switch_to(struct task_struct *prev_p, task_thread_info(next_p)->flags & _TIF_WORK_CTXSW_NEXT)) __switch_to_xtra(prev_p, next_p, tss); + switch_kmaps(prev_p, next_p); + /* * Leave lazy mode, flushing any hypercalls made here. * This must be done before restoring TLS segments so Index: linux-4.14.15-rt12/arch/x86/kvm/lapic.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/kvm/lapic.c +++ linux-4.14.15-rt12/arch/x86/kvm/lapic.c @@ -2097,7 +2097,7 @@ int kvm_create_lapic(struct kvm_vcpu *vc apic->vcpu = vcpu; hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC, - HRTIMER_MODE_ABS_PINNED); + HRTIMER_MODE_ABS_PINNED_HARD); apic->lapic_timer.timer.function = apic_timer_fn; /* Index: linux-4.14.15-rt12/arch/x86/kvm/x86.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/kvm/x86.c +++ linux-4.14.15-rt12/arch/x86/kvm/x86.c @@ -6148,6 +6148,13 @@ int kvm_arch_init(void *opaque) goto out; } +#ifdef CONFIG_PREEMPT_RT_FULL + if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { + printk(KERN_ERR "RT requires X86_FEATURE_CONSTANT_TSC\n"); + return -EOPNOTSUPP; + } +#endif + r = kvm_mmu_module_init(); if (r) goto out_free_percpu; Index: linux-4.14.15-rt12/arch/x86/mm/highmem_32.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/mm/highmem_32.c +++ linux-4.14.15-rt12/arch/x86/mm/highmem_32.c @@ -32,10 +32,11 @@ EXPORT_SYMBOL(kunmap); */ void *kmap_atomic_prot(struct page *page, pgprot_t prot) { + pte_t pte = mk_pte(page, prot); unsigned long vaddr; int idx, type; - preempt_disable(); + preempt_disable_nort(); pagefault_disable(); if (!PageHighMem(page)) @@ -45,7 +46,10 @@ void *kmap_atomic_prot(struct page *page idx = type + KM_TYPE_NR*smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); BUG_ON(!pte_none(*(kmap_pte-idx))); - set_pte(kmap_pte-idx, mk_pte(page, prot)); +#ifdef CONFIG_PREEMPT_RT_FULL + current->kmap_pte[type] = pte; +#endif + set_pte(kmap_pte-idx, pte); arch_flush_lazy_mmu_mode(); return (void *)vaddr; @@ -88,6 +92,9 @@ void __kunmap_atomic(void *kvaddr) * is a bad idea also, in case the page changes cacheability * attributes or becomes a protected page in a hypervisor. */ +#ifdef CONFIG_PREEMPT_RT_FULL + current->kmap_pte[type] = __pte(0); +#endif kpte_clear_flush(kmap_pte-idx, vaddr); kmap_atomic_idx_pop(); arch_flush_lazy_mmu_mode(); @@ -100,7 +107,7 @@ void __kunmap_atomic(void *kvaddr) #endif pagefault_enable(); - preempt_enable(); + preempt_enable_nort(); } EXPORT_SYMBOL(__kunmap_atomic); Index: linux-4.14.15-rt12/arch/x86/mm/iomap_32.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/mm/iomap_32.c +++ linux-4.14.15-rt12/arch/x86/mm/iomap_32.c @@ -56,6 +56,7 @@ EXPORT_SYMBOL_GPL(iomap_free); void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot) { + pte_t pte = pfn_pte(pfn, prot); unsigned long vaddr; int idx, type; @@ -65,7 +66,12 @@ void *kmap_atomic_prot_pfn(unsigned long type = kmap_atomic_idx_push(); idx = type + KM_TYPE_NR * smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - set_pte(kmap_pte - idx, pfn_pte(pfn, prot)); + WARN_ON(!pte_none(*(kmap_pte - idx))); + +#ifdef CONFIG_PREEMPT_RT_FULL + current->kmap_pte[type] = pte; +#endif + set_pte(kmap_pte - idx, pte); arch_flush_lazy_mmu_mode(); return (void *)vaddr; @@ -113,6 +119,9 @@ iounmap_atomic(void __iomem *kvaddr) * is a bad idea also, in case the page changes cacheability * attributes or becomes a protected page in a hypervisor. */ +#ifdef CONFIG_PREEMPT_RT_FULL + current->kmap_pte[type] = __pte(0); +#endif kpte_clear_flush(kmap_pte-idx, vaddr); kmap_atomic_idx_pop(); } Index: linux-4.14.15-rt12/arch/x86/platform/uv/tlb_uv.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/platform/uv/tlb_uv.c +++ linux-4.14.15-rt12/arch/x86/platform/uv/tlb_uv.c @@ -740,9 +740,9 @@ static void destination_plugged(struct b quiesce_local_uvhub(hmaster); - spin_lock(&hmaster->queue_lock); + raw_spin_lock(&hmaster->queue_lock); reset_with_ipi(&bau_desc->distribution, bcp); - spin_unlock(&hmaster->queue_lock); + raw_spin_unlock(&hmaster->queue_lock); end_uvhub_quiesce(hmaster); @@ -762,9 +762,9 @@ static void destination_timeout(struct b quiesce_local_uvhub(hmaster); - spin_lock(&hmaster->queue_lock); + raw_spin_lock(&hmaster->queue_lock); reset_with_ipi(&bau_desc->distribution, bcp); - spin_unlock(&hmaster->queue_lock); + raw_spin_unlock(&hmaster->queue_lock); end_uvhub_quiesce(hmaster); @@ -785,7 +785,7 @@ static void disable_for_period(struct ba cycles_t tm1; hmaster = bcp->uvhub_master; - spin_lock(&hmaster->disable_lock); + raw_spin_lock(&hmaster->disable_lock); if (!bcp->baudisabled) { stat->s_bau_disabled++; tm1 = get_cycles(); @@ -798,7 +798,7 @@ static void disable_for_period(struct ba } } } - spin_unlock(&hmaster->disable_lock); + raw_spin_unlock(&hmaster->disable_lock); } static void count_max_concurr(int stat, struct bau_control *bcp, @@ -861,7 +861,7 @@ static void record_send_stats(cycles_t t */ static void uv1_throttle(struct bau_control *hmaster, struct ptc_stats *stat) { - spinlock_t *lock = &hmaster->uvhub_lock; + raw_spinlock_t *lock = &hmaster->uvhub_lock; atomic_t *v; v = &hmaster->active_descriptor_count; @@ -995,7 +995,7 @@ static int check_enable(struct bau_contr struct bau_control *hmaster; hmaster = bcp->uvhub_master; - spin_lock(&hmaster->disable_lock); + raw_spin_lock(&hmaster->disable_lock); if (bcp->baudisabled && (get_cycles() >= bcp->set_bau_on_time)) { stat->s_bau_reenabled++; for_each_present_cpu(tcpu) { @@ -1007,10 +1007,10 @@ static int check_enable(struct bau_contr tbcp->period_giveups = 0; } } - spin_unlock(&hmaster->disable_lock); + raw_spin_unlock(&hmaster->disable_lock); return 0; } - spin_unlock(&hmaster->disable_lock); + raw_spin_unlock(&hmaster->disable_lock); return -1; } @@ -1941,9 +1941,9 @@ static void __init init_per_cpu_tunables bcp->cong_reps = congested_reps; bcp->disabled_period = sec_2_cycles(disabled_period); bcp->giveup_limit = giveup_limit; - spin_lock_init(&bcp->queue_lock); - spin_lock_init(&bcp->uvhub_lock); - spin_lock_init(&bcp->disable_lock); + raw_spin_lock_init(&bcp->queue_lock); + raw_spin_lock_init(&bcp->uvhub_lock); + raw_spin_lock_init(&bcp->disable_lock); } } Index: linux-4.14.15-rt12/arch/x86/platform/uv/uv_time.c =================================================================== --- linux-4.14.15-rt12.orig/arch/x86/platform/uv/uv_time.c +++ linux-4.14.15-rt12/arch/x86/platform/uv/uv_time.c @@ -57,7 +57,7 @@ static DEFINE_PER_CPU(struct clock_event /* There is one of these allocated per node */ struct uv_rtc_timer_head { - spinlock_t lock; + raw_spinlock_t lock; /* next cpu waiting for timer, local node relative: */ int next_cpu; /* number of cpus on this node: */ @@ -177,7 +177,7 @@ static __init int uv_rtc_allocate_timers uv_rtc_deallocate_timers(); return -ENOMEM; } - spin_lock_init(&head->lock); + raw_spin_lock_init(&head->lock); head->ncpus = uv_blade_nr_possible_cpus(bid); head->next_cpu = -1; blade_info[bid] = head; @@ -231,7 +231,7 @@ static int uv_rtc_set_timer(int cpu, u64 unsigned long flags; int next_cpu; - spin_lock_irqsave(&head->lock, flags); + raw_spin_lock_irqsave(&head->lock, flags); next_cpu = head->next_cpu; *t = expires; @@ -243,12 +243,12 @@ static int uv_rtc_set_timer(int cpu, u64 if (uv_setup_intr(cpu, expires)) { *t = ULLONG_MAX; uv_rtc_find_next_timer(head, pnode); - spin_unlock_irqrestore(&head->lock, flags); + raw_spin_unlock_irqrestore(&head->lock, flags); return -ETIME; } } - spin_unlock_irqrestore(&head->lock, flags); + raw_spin_unlock_irqrestore(&head->lock, flags); return 0; } @@ -267,7 +267,7 @@ static int uv_rtc_unset_timer(int cpu, i unsigned long flags; int rc = 0; - spin_lock_irqsave(&head->lock, flags); + raw_spin_lock_irqsave(&head->lock, flags); if ((head->next_cpu == bcpu && uv_read_rtc(NULL) >= *t) || force) rc = 1; @@ -279,7 +279,7 @@ static int uv_rtc_unset_timer(int cpu, i uv_rtc_find_next_timer(head, pnode); } - spin_unlock_irqrestore(&head->lock, flags); + raw_spin_unlock_irqrestore(&head->lock, flags); return rc; } @@ -299,13 +299,17 @@ static int uv_rtc_unset_timer(int cpu, i static u64 uv_read_rtc(struct clocksource *cs) { unsigned long offset; + u64 cycles; + preempt_disable(); if (uv_get_min_hub_revision_id() == 1) offset = 0; else offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE; - return (u64)uv_read_local_mmr(UVH_RTC | offset); + cycles = (u64)uv_read_local_mmr(UVH_RTC | offset); + preempt_enable(); + return cycles; } /* Index: linux-4.14.15-rt12/arch/xtensa/include/asm/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/arch/xtensa/include/asm/spinlock_types.h +++ linux-4.14.15-rt12/arch/xtensa/include/asm/spinlock_types.h @@ -2,10 +2,6 @@ #ifndef __ASM_SPINLOCK_TYPES_H #define __ASM_SPINLOCK_TYPES_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - typedef struct { volatile unsigned int slock; } arch_spinlock_t; Index: linux-4.14.15-rt12/block/blk-core.c =================================================================== --- linux-4.14.15-rt12.orig/block/blk-core.c +++ linux-4.14.15-rt12/block/blk-core.c @@ -116,6 +116,9 @@ void blk_rq_init(struct request_queue *q INIT_LIST_HEAD(&rq->queuelist); INIT_LIST_HEAD(&rq->timeout_list); +#ifdef CONFIG_PREEMPT_RT_FULL + INIT_WORK(&rq->work, __blk_mq_complete_request_remote_work); +#endif rq->cpu = -1; rq->q = q; rq->__sector = (sector_t) -1; @@ -280,7 +283,7 @@ EXPORT_SYMBOL(blk_start_queue_async); void blk_start_queue(struct request_queue *q) { lockdep_assert_held(q->queue_lock); - WARN_ON(!in_interrupt() && !irqs_disabled()); + WARN_ON_NONRT(!in_interrupt() && !irqs_disabled()); WARN_ON_ONCE(q->mq_ops); queue_flag_clear(QUEUE_FLAG_STOPPED, q); @@ -811,12 +814,21 @@ void blk_queue_exit(struct request_queue percpu_ref_put(&q->q_usage_counter); } +static void blk_queue_usage_counter_release_swork(struct swork_event *sev) +{ + struct request_queue *q = + container_of(sev, struct request_queue, mq_pcpu_wake); + + wake_up_all(&q->mq_freeze_wq); +} + static void blk_queue_usage_counter_release(struct percpu_ref *ref) { struct request_queue *q = container_of(ref, struct request_queue, q_usage_counter); - wake_up_all(&q->mq_freeze_wq); + if (wq_has_sleeper(&q->mq_freeze_wq)) + swork_queue(&q->mq_pcpu_wake); } static void blk_rq_timed_out_timer(unsigned long data) @@ -893,6 +905,7 @@ struct request_queue *blk_alloc_queue_no __set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags); init_waitqueue_head(&q->mq_freeze_wq); + INIT_SWORK(&q->mq_pcpu_wake, blk_queue_usage_counter_release_swork); /* * Init percpu_ref in atomic mode so that it's faster to shutdown. @@ -3305,7 +3318,7 @@ static void queue_unplugged(struct reque blk_run_queue_async(q); else __blk_run_queue(q); - spin_unlock(q->queue_lock); + spin_unlock_irq(q->queue_lock); } static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule) @@ -3353,7 +3366,6 @@ EXPORT_SYMBOL(blk_check_plugged); void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule) { struct request_queue *q; - unsigned long flags; struct request *rq; LIST_HEAD(list); unsigned int depth; @@ -3373,11 +3385,6 @@ void blk_flush_plug_list(struct blk_plug q = NULL; depth = 0; - /* - * Save and disable interrupts here, to avoid doing it for every - * queue lock we have to take. - */ - local_irq_save(flags); while (!list_empty(&list)) { rq = list_entry_rq(list.next); list_del_init(&rq->queuelist); @@ -3390,7 +3397,7 @@ void blk_flush_plug_list(struct blk_plug queue_unplugged(q, depth, from_schedule); q = rq->q; depth = 0; - spin_lock(q->queue_lock); + spin_lock_irq(q->queue_lock); } /* @@ -3417,8 +3424,6 @@ void blk_flush_plug_list(struct blk_plug */ if (q) queue_unplugged(q, depth, from_schedule); - - local_irq_restore(flags); } void blk_finish_plug(struct blk_plug *plug) @@ -3628,6 +3633,8 @@ int __init blk_dev_init(void) if (!kblockd_workqueue) panic("Failed to create kblockd\n"); + BUG_ON(swork_get()); + request_cachep = kmem_cache_create("blkdev_requests", sizeof(struct request), 0, SLAB_PANIC, NULL); Index: linux-4.14.15-rt12/block/blk-ioc.c =================================================================== --- linux-4.14.15-rt12.orig/block/blk-ioc.c +++ linux-4.14.15-rt12/block/blk-ioc.c @@ -9,6 +9,7 @@ #include #include #include +#include #include "blk.h" @@ -118,7 +119,7 @@ static void ioc_release_fn(struct work_s spin_unlock(q->queue_lock); } else { spin_unlock_irqrestore(&ioc->lock, flags); - cpu_relax(); + cpu_chill(); spin_lock_irqsave_nested(&ioc->lock, flags, 1); } } @@ -202,7 +203,7 @@ retry: spin_unlock(icq->q->queue_lock); } else { spin_unlock_irqrestore(&ioc->lock, flags); - cpu_relax(); + cpu_chill(); goto retry; } } Index: linux-4.14.15-rt12/block/blk-mq.c =================================================================== --- linux-4.14.15-rt12.orig/block/blk-mq.c +++ linux-4.14.15-rt12/block/blk-mq.c @@ -320,6 +320,9 @@ static struct request *blk_mq_rq_ctx_ini /* tag was already set */ rq->extra_len = 0; +#ifdef CONFIG_PREEMPT_RT_FULL + INIT_WORK(&rq->work, __blk_mq_complete_request_remote_work); +#endif INIT_LIST_HEAD(&rq->timeout_list); rq->timeout = 0; @@ -514,12 +517,24 @@ void blk_mq_end_request(struct request * } EXPORT_SYMBOL(blk_mq_end_request); +#ifdef CONFIG_PREEMPT_RT_FULL + +void __blk_mq_complete_request_remote_work(struct work_struct *work) +{ + struct request *rq = container_of(work, struct request, work); + + rq->q->softirq_done_fn(rq); +} + +#else + static void __blk_mq_complete_request_remote(void *data) { struct request *rq = data; rq->q->softirq_done_fn(rq); } +#endif static void __blk_mq_complete_request(struct request *rq) { @@ -539,19 +554,27 @@ static void __blk_mq_complete_request(st return; } - cpu = get_cpu(); + cpu = get_cpu_light(); if (!test_bit(QUEUE_FLAG_SAME_FORCE, &rq->q->queue_flags)) shared = cpus_share_cache(cpu, ctx->cpu); if (cpu != ctx->cpu && !shared && cpu_online(ctx->cpu)) { +#ifdef CONFIG_PREEMPT_RT_FULL + /* + * We could force QUEUE_FLAG_SAME_FORCE then we would not get in + * here. But we could try to invoke it one the CPU like this. + */ + schedule_work_on(ctx->cpu, &rq->work); +#else rq->csd.func = __blk_mq_complete_request_remote; rq->csd.info = rq; rq->csd.flags = 0; smp_call_function_single_async(ctx->cpu, &rq->csd); +#endif } else { rq->q->softirq_done_fn(rq); } - put_cpu(); + put_cpu_light(); } /** @@ -1201,14 +1224,14 @@ static void __blk_mq_delay_run_hw_queue( return; if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) { - int cpu = get_cpu(); + int cpu = get_cpu_light(); if (cpumask_test_cpu(cpu, hctx->cpumask)) { __blk_mq_run_hw_queue(hctx); - put_cpu(); + put_cpu_light(); return; } - put_cpu(); + put_cpu_light(); } kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx), @@ -2804,10 +2827,9 @@ static bool blk_mq_poll_hybrid_sleep(str kt = nsecs; mode = HRTIMER_MODE_REL; - hrtimer_init_on_stack(&hs.timer, CLOCK_MONOTONIC, mode); + hrtimer_init_sleeper_on_stack(&hs, CLOCK_MONOTONIC, mode, current); hrtimer_set_expires(&hs.timer, kt); - hrtimer_init_sleeper(&hs, current); do { if (test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags)) break; Index: linux-4.14.15-rt12/block/blk-mq.h =================================================================== --- linux-4.14.15-rt12.orig/block/blk-mq.h +++ linux-4.14.15-rt12/block/blk-mq.h @@ -98,12 +98,12 @@ static inline struct blk_mq_ctx *__blk_m */ static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q) { - return __blk_mq_get_ctx(q, get_cpu()); + return __blk_mq_get_ctx(q, get_cpu_light()); } static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) { - put_cpu(); + put_cpu_light(); } struct blk_mq_alloc_data { Index: linux-4.14.15-rt12/block/blk-softirq.c =================================================================== --- linux-4.14.15-rt12.orig/block/blk-softirq.c +++ linux-4.14.15-rt12/block/blk-softirq.c @@ -53,6 +53,7 @@ static void trigger_softirq(void *data) raise_softirq_irqoff(BLOCK_SOFTIRQ); local_irq_restore(flags); + preempt_check_resched_rt(); } /* @@ -91,6 +92,7 @@ static int blk_softirq_cpu_dead(unsigned this_cpu_ptr(&blk_cpu_done)); raise_softirq_irqoff(BLOCK_SOFTIRQ); local_irq_enable(); + preempt_check_resched_rt(); return 0; } @@ -143,6 +145,7 @@ do_local: goto do_local; local_irq_restore(flags); + preempt_check_resched_rt(); } /** Index: linux-4.14.15-rt12/block/bounce.c =================================================================== --- linux-4.14.15-rt12.orig/block/bounce.c +++ linux-4.14.15-rt12/block/bounce.c @@ -66,11 +66,11 @@ static void bounce_copy_vec(struct bio_v unsigned long flags; unsigned char *vto; - local_irq_save(flags); + local_irq_save_nort(flags); vto = kmap_atomic(to->bv_page); memcpy(vto + to->bv_offset, vfrom, to->bv_len); kunmap_atomic(vto); - local_irq_restore(flags); + local_irq_restore_nort(flags); } #else /* CONFIG_HIGHMEM */ Index: linux-4.14.15-rt12/crypto/algapi.c =================================================================== --- linux-4.14.15-rt12.orig/crypto/algapi.c +++ linux-4.14.15-rt12/crypto/algapi.c @@ -731,13 +731,13 @@ EXPORT_SYMBOL_GPL(crypto_spawn_tfm2); int crypto_register_notifier(struct notifier_block *nb) { - return blocking_notifier_chain_register(&crypto_chain, nb); + return srcu_notifier_chain_register(&crypto_chain, nb); } EXPORT_SYMBOL_GPL(crypto_register_notifier); int crypto_unregister_notifier(struct notifier_block *nb) { - return blocking_notifier_chain_unregister(&crypto_chain, nb); + return srcu_notifier_chain_unregister(&crypto_chain, nb); } EXPORT_SYMBOL_GPL(crypto_unregister_notifier); Index: linux-4.14.15-rt12/crypto/api.c =================================================================== --- linux-4.14.15-rt12.orig/crypto/api.c +++ linux-4.14.15-rt12/crypto/api.c @@ -31,7 +31,7 @@ EXPORT_SYMBOL_GPL(crypto_alg_list); DECLARE_RWSEM(crypto_alg_sem); EXPORT_SYMBOL_GPL(crypto_alg_sem); -BLOCKING_NOTIFIER_HEAD(crypto_chain); +SRCU_NOTIFIER_HEAD(crypto_chain); EXPORT_SYMBOL_GPL(crypto_chain); static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg); @@ -236,10 +236,10 @@ int crypto_probing_notify(unsigned long { int ok; - ok = blocking_notifier_call_chain(&crypto_chain, val, v); + ok = srcu_notifier_call_chain(&crypto_chain, val, v); if (ok == NOTIFY_DONE) { request_module("cryptomgr"); - ok = blocking_notifier_call_chain(&crypto_chain, val, v); + ok = srcu_notifier_call_chain(&crypto_chain, val, v); } return ok; Index: linux-4.14.15-rt12/crypto/internal.h =================================================================== --- linux-4.14.15-rt12.orig/crypto/internal.h +++ linux-4.14.15-rt12/crypto/internal.h @@ -47,7 +47,7 @@ struct crypto_larval { extern struct list_head crypto_alg_list; extern struct rw_semaphore crypto_alg_sem; -extern struct blocking_notifier_head crypto_chain; +extern struct srcu_notifier_head crypto_chain; #ifdef CONFIG_PROC_FS void __init crypto_init_proc(void); @@ -143,7 +143,7 @@ static inline int crypto_is_moribund(str static inline void crypto_notify(unsigned long val, void *v) { - blocking_notifier_call_chain(&crypto_chain, val, v); + srcu_notifier_call_chain(&crypto_chain, val, v); } #endif /* _CRYPTO_INTERNAL_H */ Index: linux-4.14.15-rt12/drivers/acpi/acpica/acglobal.h =================================================================== --- linux-4.14.15-rt12.orig/drivers/acpi/acpica/acglobal.h +++ linux-4.14.15-rt12/drivers/acpi/acpica/acglobal.h @@ -116,7 +116,7 @@ ACPI_GLOBAL(u8, acpi_gbl_global_lock_pen * interrupt level */ ACPI_GLOBAL(acpi_spinlock, acpi_gbl_gpe_lock); /* For GPE data structs and registers */ -ACPI_GLOBAL(acpi_spinlock, acpi_gbl_hardware_lock); /* For ACPI H/W except GPE registers */ +ACPI_GLOBAL(acpi_raw_spinlock, acpi_gbl_hardware_lock); /* For ACPI H/W except GPE registers */ ACPI_GLOBAL(acpi_spinlock, acpi_gbl_reference_count_lock); /* Mutex for _OSI support */ Index: linux-4.14.15-rt12/drivers/acpi/acpica/hwregs.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/acpi/acpica/hwregs.c +++ linux-4.14.15-rt12/drivers/acpi/acpica/hwregs.c @@ -428,14 +428,14 @@ acpi_status acpi_hw_clear_acpi_status(vo ACPI_BITMASK_ALL_FIXED_STATUS, ACPI_FORMAT_UINT64(acpi_gbl_xpm1a_status.address))); - lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); + raw_spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags); /* Clear the fixed events in PM1 A/B */ status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, ACPI_BITMASK_ALL_FIXED_STATUS); - acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); + raw_spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags); if (ACPI_FAILURE(status)) { goto exit; Index: linux-4.14.15-rt12/drivers/acpi/acpica/hwxface.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/acpi/acpica/hwxface.c +++ linux-4.14.15-rt12/drivers/acpi/acpica/hwxface.c @@ -373,7 +373,7 @@ acpi_status acpi_write_bit_register(u32 return_ACPI_STATUS(AE_BAD_PARAMETER); } - lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); + raw_spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags); /* * At this point, we know that the parent register is one of the @@ -434,7 +434,7 @@ acpi_status acpi_write_bit_register(u32 unlock_and_exit: - acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); + raw_spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags); return_ACPI_STATUS(status); } Index: linux-4.14.15-rt12/drivers/acpi/acpica/utmutex.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/acpi/acpica/utmutex.c +++ linux-4.14.15-rt12/drivers/acpi/acpica/utmutex.c @@ -88,7 +88,7 @@ acpi_status acpi_ut_mutex_initialize(voi return_ACPI_STATUS (status); } - status = acpi_os_create_lock (&acpi_gbl_hardware_lock); + status = acpi_os_create_raw_lock (&acpi_gbl_hardware_lock); if (ACPI_FAILURE (status)) { return_ACPI_STATUS (status); } @@ -145,7 +145,7 @@ void acpi_ut_mutex_terminate(void) /* Delete the spinlocks */ acpi_os_delete_lock(acpi_gbl_gpe_lock); - acpi_os_delete_lock(acpi_gbl_hardware_lock); + acpi_os_delete_raw_lock(acpi_gbl_hardware_lock); acpi_os_delete_lock(acpi_gbl_reference_count_lock); /* Delete the reader/writer lock */ Index: linux-4.14.15-rt12/drivers/ata/libata-sff.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/ata/libata-sff.c +++ linux-4.14.15-rt12/drivers/ata/libata-sff.c @@ -679,9 +679,9 @@ unsigned int ata_sff_data_xfer_noirq(str unsigned long flags; unsigned int consumed; - local_irq_save(flags); + local_irq_save_nort(flags); consumed = ata_sff_data_xfer32(qc, buf, buflen, rw); - local_irq_restore(flags); + local_irq_restore_nort(flags); return consumed; } Index: linux-4.14.15-rt12/drivers/block/brd.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/block/brd.c +++ linux-4.14.15-rt12/drivers/block/brd.c @@ -60,7 +60,6 @@ struct brd_device { /* * Look up and return a brd's page for a given sector. */ -static DEFINE_MUTEX(brd_mutex); static struct page *brd_lookup_page(struct brd_device *brd, sector_t sector) { pgoff_t idx; Index: linux-4.14.15-rt12/drivers/block/zram/zcomp.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/block/zram/zcomp.c +++ linux-4.14.15-rt12/drivers/block/zram/zcomp.c @@ -116,12 +116,20 @@ ssize_t zcomp_available_show(const char struct zcomp_strm *zcomp_stream_get(struct zcomp *comp) { - return *get_cpu_ptr(comp->stream); + struct zcomp_strm *zstrm; + + zstrm = *get_local_ptr(comp->stream); + spin_lock(&zstrm->zcomp_lock); + return zstrm; } void zcomp_stream_put(struct zcomp *comp) { - put_cpu_ptr(comp->stream); + struct zcomp_strm *zstrm; + + zstrm = *this_cpu_ptr(comp->stream); + spin_unlock(&zstrm->zcomp_lock); + put_local_ptr(zstrm); } int zcomp_compress(struct zcomp_strm *zstrm, @@ -171,6 +179,7 @@ int zcomp_cpu_up_prepare(unsigned int cp pr_err("Can't allocate a compression stream\n"); return -ENOMEM; } + spin_lock_init(&zstrm->zcomp_lock); *per_cpu_ptr(comp->stream, cpu) = zstrm; return 0; } Index: linux-4.14.15-rt12/drivers/block/zram/zcomp.h =================================================================== --- linux-4.14.15-rt12.orig/drivers/block/zram/zcomp.h +++ linux-4.14.15-rt12/drivers/block/zram/zcomp.h @@ -14,6 +14,7 @@ struct zcomp_strm { /* compression/decompression buffer */ void *buffer; struct crypto_comp *tfm; + spinlock_t zcomp_lock; }; /* dynamic per-device compression frontend */ Index: linux-4.14.15-rt12/drivers/block/zram/zram_drv.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/block/zram/zram_drv.c +++ linux-4.14.15-rt12/drivers/block/zram/zram_drv.c @@ -756,6 +756,30 @@ static DEVICE_ATTR_RO(io_stat); static DEVICE_ATTR_RO(mm_stat); static DEVICE_ATTR_RO(debug_stat); +#ifdef CONFIG_PREEMPT_RT_BASE +static void zram_meta_init_table_locks(struct zram *zram, size_t num_pages) +{ + size_t index; + + for (index = 0; index < num_pages; index++) + spin_lock_init(&zram->table[index].lock); +} + +static void zram_slot_lock(struct zram *zram, u32 index) +{ + spin_lock(&zram->table[index].lock); + __set_bit(ZRAM_ACCESS, &zram->table[index].value); +} + +static void zram_slot_unlock(struct zram *zram, u32 index) +{ + __clear_bit(ZRAM_ACCESS, &zram->table[index].value); + spin_unlock(&zram->table[index].lock); +} + +#else +static void zram_meta_init_table_locks(struct zram *zram, size_t num_pages) { } + static void zram_slot_lock(struct zram *zram, u32 index) { bit_spin_lock(ZRAM_ACCESS, &zram->table[index].value); @@ -765,6 +789,7 @@ static void zram_slot_unlock(struct zram { bit_spin_unlock(ZRAM_ACCESS, &zram->table[index].value); } +#endif static void zram_meta_free(struct zram *zram, u64 disksize) { @@ -794,6 +819,7 @@ static bool zram_meta_alloc(struct zram return false; } + zram_meta_init_table_locks(zram, num_pages); return true; } @@ -845,6 +871,7 @@ static int __zram_bvec_read(struct zram unsigned long handle; unsigned int size; void *src, *dst; + struct zcomp_strm *zstrm; if (zram_wb_enabled(zram)) { zram_slot_lock(zram, index); @@ -879,6 +906,7 @@ static int __zram_bvec_read(struct zram size = zram_get_obj_size(zram, index); + zstrm = zcomp_stream_get(zram->comp); src = zs_map_object(zram->mem_pool, handle, ZS_MM_RO); if (size == PAGE_SIZE) { dst = kmap_atomic(page); @@ -886,14 +914,13 @@ static int __zram_bvec_read(struct zram kunmap_atomic(dst); ret = 0; } else { - struct zcomp_strm *zstrm = zcomp_stream_get(zram->comp); dst = kmap_atomic(page); ret = zcomp_decompress(zstrm, src, size, dst); kunmap_atomic(dst); - zcomp_stream_put(zram->comp); } zs_unmap_object(zram->mem_pool, handle); + zcomp_stream_put(zram->comp); zram_slot_unlock(zram, index); /* Should NEVER happen. Return bio error if it does. */ Index: linux-4.14.15-rt12/drivers/block/zram/zram_drv.h =================================================================== --- linux-4.14.15-rt12.orig/drivers/block/zram/zram_drv.h +++ linux-4.14.15-rt12/drivers/block/zram/zram_drv.h @@ -77,6 +77,9 @@ struct zram_table_entry { unsigned long element; }; unsigned long value; +#ifdef CONFIG_PREEMPT_RT_BASE + spinlock_t lock; +#endif }; struct zram_stats { Index: linux-4.14.15-rt12/drivers/char/random.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/char/random.c +++ linux-4.14.15-rt12/drivers/char/random.c @@ -264,6 +264,7 @@ #include #include #include +#include #include #include @@ -807,7 +808,7 @@ static int crng_fast_load(const char *cp invalidate_batched_entropy(); crng_init = 1; wake_up_interruptible(&crng_init_wait); - pr_notice("random: fast init done\n"); + /* pr_notice("random: fast init done\n"); */ } return 1; } @@ -846,7 +847,7 @@ static void crng_reseed(struct crng_stat crng_init = 2; process_random_ready_list(); wake_up_interruptible(&crng_init_wait); - pr_notice("random: crng init done\n"); + /* pr_notice("random: crng init done\n"); */ } } @@ -1016,8 +1017,6 @@ static void add_timer_randomness(struct } sample; long delta, delta2, delta3; - preempt_disable(); - sample.jiffies = jiffies; sample.cycles = random_get_entropy(); sample.num = num; @@ -1058,7 +1057,6 @@ static void add_timer_randomness(struct */ credit_entropy_bits(r, min_t(int, fls(delta>>1), 11)); } - preempt_enable(); } void add_input_randomness(unsigned int type, unsigned int code, @@ -1115,28 +1113,27 @@ static __u32 get_reg(struct fast_pool *f return *ptr; } -void add_interrupt_randomness(int irq, int irq_flags) +void add_interrupt_randomness(int irq, int irq_flags, __u64 ip) { struct entropy_store *r; struct fast_pool *fast_pool = this_cpu_ptr(&irq_randomness); - struct pt_regs *regs = get_irq_regs(); unsigned long now = jiffies; cycles_t cycles = random_get_entropy(); __u32 c_high, j_high; - __u64 ip; unsigned long seed; int credit = 0; if (cycles == 0) - cycles = get_reg(fast_pool, regs); + cycles = get_reg(fast_pool, NULL); c_high = (sizeof(cycles) > 4) ? cycles >> 32 : 0; j_high = (sizeof(now) > 4) ? now >> 32 : 0; fast_pool->pool[0] ^= cycles ^ j_high ^ irq; fast_pool->pool[1] ^= now ^ c_high; - ip = regs ? instruction_pointer(regs) : _RET_IP_; + if (!ip) + ip = _RET_IP_; fast_pool->pool[2] ^= ip; fast_pool->pool[3] ^= (sizeof(ip) > 4) ? ip >> 32 : - get_reg(fast_pool, regs); + get_reg(fast_pool, NULL); fast_mix(fast_pool); add_interrupt_bench(cycles); @@ -2090,6 +2087,7 @@ static rwlock_t batched_entropy_reset_lo * at any point prior. */ static DEFINE_PER_CPU(struct batched_entropy, batched_entropy_u64); +static DEFINE_LOCAL_IRQ_LOCK(batched_entropy_u64_lock); u64 get_random_u64(void) { u64 ret; @@ -2110,7 +2108,7 @@ u64 get_random_u64(void) warn_unseeded_randomness(&previous); use_lock = READ_ONCE(crng_init) < 2; - batch = &get_cpu_var(batched_entropy_u64); + batch = &get_locked_var(batched_entropy_u64_lock, batched_entropy_u64); if (use_lock) read_lock_irqsave(&batched_entropy_reset_lock, flags); if (batch->position % ARRAY_SIZE(batch->entropy_u64) == 0) { @@ -2120,12 +2118,13 @@ u64 get_random_u64(void) ret = batch->entropy_u64[batch->position++]; if (use_lock) read_unlock_irqrestore(&batched_entropy_reset_lock, flags); - put_cpu_var(batched_entropy_u64); + put_locked_var(batched_entropy_u64_lock, batched_entropy_u64); return ret; } EXPORT_SYMBOL(get_random_u64); static DEFINE_PER_CPU(struct batched_entropy, batched_entropy_u32); +static DEFINE_LOCAL_IRQ_LOCK(batched_entropy_u32_lock); u32 get_random_u32(void) { u32 ret; @@ -2140,7 +2139,7 @@ u32 get_random_u32(void) warn_unseeded_randomness(&previous); use_lock = READ_ONCE(crng_init) < 2; - batch = &get_cpu_var(batched_entropy_u32); + batch = &get_locked_var(batched_entropy_u32_lock, batched_entropy_u32); if (use_lock) read_lock_irqsave(&batched_entropy_reset_lock, flags); if (batch->position % ARRAY_SIZE(batch->entropy_u32) == 0) { @@ -2150,7 +2149,7 @@ u32 get_random_u32(void) ret = batch->entropy_u32[batch->position++]; if (use_lock) read_unlock_irqrestore(&batched_entropy_reset_lock, flags); - put_cpu_var(batched_entropy_u32); + put_locked_var(batched_entropy_u32_lock, batched_entropy_u32); return ret; } EXPORT_SYMBOL(get_random_u32); Index: linux-4.14.15-rt12/drivers/char/tpm/tpm_tis.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/char/tpm/tpm_tis.c +++ linux-4.14.15-rt12/drivers/char/tpm/tpm_tis.c @@ -52,6 +52,31 @@ static inline struct tpm_tis_tcg_phy *to return container_of(data, struct tpm_tis_tcg_phy, priv); } +#ifdef CONFIG_PREEMPT_RT_FULL +/* + * Flushes previous write operations to chip so that a subsequent + * ioread*()s won't stall a cpu. + */ +static inline void tpm_tis_flush(void __iomem *iobase) +{ + ioread8(iobase + TPM_ACCESS(0)); +} +#else +#define tpm_tis_flush(iobase) do { } while (0) +#endif + +static inline void tpm_tis_iowrite8(u8 b, void __iomem *iobase, u32 addr) +{ + iowrite8(b, iobase + addr); + tpm_tis_flush(iobase); +} + +static inline void tpm_tis_iowrite32(u32 b, void __iomem *iobase, u32 addr) +{ + iowrite32(b, iobase + addr); + tpm_tis_flush(iobase); +} + static bool interrupts = true; module_param(interrupts, bool, 0444); MODULE_PARM_DESC(interrupts, "Enable interrupts"); @@ -149,7 +174,7 @@ static int tpm_tcg_write_bytes(struct tp struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); while (len--) - iowrite8(*value++, phy->iobase + addr); + tpm_tis_iowrite8(*value++, phy->iobase, addr); return 0; } @@ -176,7 +201,7 @@ static int tpm_tcg_write32(struct tpm_ti { struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); - iowrite32(value, phy->iobase + addr); + tpm_tis_iowrite32(value, phy->iobase, addr); return 0; } Index: linux-4.14.15-rt12/drivers/clocksource/tcb_clksrc.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/clocksource/tcb_clksrc.c +++ linux-4.14.15-rt12/drivers/clocksource/tcb_clksrc.c @@ -25,8 +25,7 @@ * this 32 bit free-running counter. the second channel is not used. * * - The third channel may be used to provide a 16-bit clockevent - * source, used in either periodic or oneshot mode. This runs - * at 32 KiHZ, and can handle delays of up to two seconds. + * source, used in either periodic or oneshot mode. * * A boot clocksource and clockevent source are also currently needed, * unless the relevant platforms (ARM/AT91, AVR32/AT32) are changed so @@ -126,6 +125,8 @@ static struct clocksource clksrc = { struct tc_clkevt_device { struct clock_event_device clkevt; struct clk *clk; + bool clk_enabled; + u32 freq; void __iomem *regs; }; @@ -134,15 +135,26 @@ static struct tc_clkevt_device *to_tc_cl return container_of(clkevt, struct tc_clkevt_device, clkevt); } -/* For now, we always use the 32K clock ... this optimizes for NO_HZ, - * because using one of the divided clocks would usually mean the - * tick rate can never be less than several dozen Hz (vs 0.5 Hz). - * - * A divided clock could be good for high resolution timers, since - * 30.5 usec resolution can seem "low". - */ static u32 timer_clock; +static void tc_clk_disable(struct clock_event_device *d) +{ + struct tc_clkevt_device *tcd = to_tc_clkevt(d); + + clk_disable(tcd->clk); + tcd->clk_enabled = false; +} + +static void tc_clk_enable(struct clock_event_device *d) +{ + struct tc_clkevt_device *tcd = to_tc_clkevt(d); + + if (tcd->clk_enabled) + return; + clk_enable(tcd->clk); + tcd->clk_enabled = true; +} + static int tc_shutdown(struct clock_event_device *d) { struct tc_clkevt_device *tcd = to_tc_clkevt(d); @@ -150,8 +162,14 @@ static int tc_shutdown(struct clock_even writel(0xff, regs + ATMEL_TC_REG(2, IDR)); writel(ATMEL_TC_CLKDIS, regs + ATMEL_TC_REG(2, CCR)); + return 0; +} + +static int tc_shutdown_clk_off(struct clock_event_device *d) +{ + tc_shutdown(d); if (!clockevent_state_detached(d)) - clk_disable(tcd->clk); + tc_clk_disable(d); return 0; } @@ -164,9 +182,9 @@ static int tc_set_oneshot(struct clock_e if (clockevent_state_oneshot(d) || clockevent_state_periodic(d)) tc_shutdown(d); - clk_enable(tcd->clk); + tc_clk_enable(d); - /* slow clock, count up to RC, then irq and stop */ + /* count up to RC, then irq and stop */ writel(timer_clock | ATMEL_TC_CPCSTOP | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO, regs + ATMEL_TC_REG(2, CMR)); writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER)); @@ -186,12 +204,12 @@ static int tc_set_periodic(struct clock_ /* By not making the gentime core emulate periodic mode on top * of oneshot, we get lower overhead and improved accuracy. */ - clk_enable(tcd->clk); + tc_clk_enable(d); - /* slow clock, count up to RC, then irq and restart */ + /* count up to RC, then irq and restart */ writel(timer_clock | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO, regs + ATMEL_TC_REG(2, CMR)); - writel((32768 + HZ / 2) / HZ, tcaddr + ATMEL_TC_REG(2, RC)); + writel((tcd->freq + HZ / 2) / HZ, tcaddr + ATMEL_TC_REG(2, RC)); /* Enable clock and interrupts on RC compare */ writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER)); @@ -218,9 +236,13 @@ static struct tc_clkevt_device clkevt = .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, /* Should be lower than at91rm9200's system timer */ +#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK .rating = 125, +#else + .rating = 200, +#endif .set_next_event = tc_next_event, - .set_state_shutdown = tc_shutdown, + .set_state_shutdown = tc_shutdown_clk_off, .set_state_periodic = tc_set_periodic, .set_state_oneshot = tc_set_oneshot, }, @@ -240,8 +262,9 @@ static irqreturn_t ch2_irq(int irq, void return IRQ_NONE; } -static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx) +static int __init setup_clkevents(struct atmel_tc *tc, int divisor_idx) { + unsigned divisor = atmel_tc_divisors[divisor_idx]; int ret; struct clk *t2_clk = tc->clk[2]; int irq = tc->irq[2]; @@ -262,7 +285,11 @@ static int __init setup_clkevents(struct clkevt.regs = tc->regs; clkevt.clk = t2_clk; - timer_clock = clk32k_divisor_idx; + timer_clock = divisor_idx; + if (!divisor) + clkevt.freq = 32768; + else + clkevt.freq = clk_get_rate(t2_clk) / divisor; clkevt.clkevt.cpumask = cpumask_of(0); @@ -273,7 +300,7 @@ static int __init setup_clkevents(struct return ret; } - clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff); + clockevents_config_and_register(&clkevt.clkevt, clkevt.freq, 1, 0xffff); return ret; } @@ -410,7 +437,11 @@ static int __init tcb_clksrc_init(void) goto err_disable_t1; /* channel 2: periodic and oneshot timer support */ +#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK ret = setup_clkevents(tc, clk32k_divisor_idx); +#else + ret = setup_clkevents(tc, best_divisor_idx); +#endif if (ret) goto err_unregister_clksrc; Index: linux-4.14.15-rt12/drivers/clocksource/timer-atmel-pit.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/clocksource/timer-atmel-pit.c +++ linux-4.14.15-rt12/drivers/clocksource/timer-atmel-pit.c @@ -46,6 +46,7 @@ struct pit_data { u32 cycle; u32 cnt; unsigned int irq; + bool irq_requested; struct clk *mck; }; @@ -96,15 +97,29 @@ static int pit_clkevt_shutdown(struct cl /* disable irq, leaving the clocksource active */ pit_write(data->base, AT91_PIT_MR, (data->cycle - 1) | AT91_PIT_PITEN); + if (data->irq_requested) { + free_irq(data->irq, data); + data->irq_requested = false; + } return 0; } +static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id); /* * Clockevent device: interrupts every 1/HZ (== pit_cycles * MCK/16) */ static int pit_clkevt_set_periodic(struct clock_event_device *dev) { struct pit_data *data = clkevt_to_pit_data(dev); + int ret; + + ret = request_irq(data->irq, at91sam926x_pit_interrupt, + IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, + "at91_tick", data); + if (ret) + panic(pr_fmt("Unable to setup IRQ\n")); + + data->irq_requested = true; /* update clocksource counter */ data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR)); @@ -230,15 +245,6 @@ static int __init at91sam926x_pit_dt_ini return ret; } - /* Set up irq handler */ - ret = request_irq(data->irq, at91sam926x_pit_interrupt, - IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, - "at91_tick", data); - if (ret) { - pr_err("Unable to setup IRQ\n"); - return ret; - } - /* Set up and register clockevents */ data->clkevt.name = "pit"; data->clkevt.features = CLOCK_EVT_FEAT_PERIODIC; Index: linux-4.14.15-rt12/drivers/clocksource/timer-atmel-st.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/clocksource/timer-atmel-st.c +++ linux-4.14.15-rt12/drivers/clocksource/timer-atmel-st.c @@ -115,18 +115,29 @@ static void clkdev32k_disable_and_flush_ last_crtr = read_CRTR(); } +static int atmel_st_irq; + static int clkevt32k_shutdown(struct clock_event_device *evt) { clkdev32k_disable_and_flush_irq(); irqmask = 0; regmap_write(regmap_st, AT91_ST_IER, irqmask); + free_irq(atmel_st_irq, regmap_st); return 0; } static int clkevt32k_set_oneshot(struct clock_event_device *dev) { + int ret; + clkdev32k_disable_and_flush_irq(); + ret = request_irq(atmel_st_irq, at91rm9200_timer_interrupt, + IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, + "at91_tick", regmap_st); + if (ret) + panic(pr_fmt("Unable to setup IRQ\n")); + /* * ALM for oneshot irqs, set by next_event() * before 32 seconds have passed. @@ -139,8 +150,16 @@ static int clkevt32k_set_oneshot(struct static int clkevt32k_set_periodic(struct clock_event_device *dev) { + int ret; + clkdev32k_disable_and_flush_irq(); + ret = request_irq(atmel_st_irq, at91rm9200_timer_interrupt, + IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, + "at91_tick", regmap_st); + if (ret) + panic(pr_fmt("Unable to setup IRQ\n")); + /* PIT for periodic irqs; fixed rate of 1/HZ */ irqmask = AT91_ST_PITS; regmap_write(regmap_st, AT91_ST_PIMR, timer_latch); @@ -198,7 +217,7 @@ static int __init atmel_st_timer_init(st { struct clk *sclk; unsigned int sclk_rate, val; - int irq, ret; + int ret; regmap_st = syscon_node_to_regmap(node); if (IS_ERR(regmap_st)) { @@ -212,21 +231,12 @@ static int __init atmel_st_timer_init(st regmap_read(regmap_st, AT91_ST_SR, &val); /* Get the interrupts property */ - irq = irq_of_parse_and_map(node, 0); - if (!irq) { + atmel_st_irq = irq_of_parse_and_map(node, 0); + if (!atmel_st_irq) { pr_err("Unable to get IRQ from DT\n"); return -EINVAL; } - /* Make IRQs happen for the system timer */ - ret = request_irq(irq, at91rm9200_timer_interrupt, - IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, - "at91_tick", regmap_st); - if (ret) { - pr_err("Unable to setup IRQ\n"); - return ret; - } - sclk = of_clk_get(node, 0); if (IS_ERR(sclk)) { pr_err("Unable to get slow clock\n"); Index: linux-4.14.15-rt12/drivers/connector/cn_proc.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/connector/cn_proc.c +++ linux-4.14.15-rt12/drivers/connector/cn_proc.c @@ -32,6 +32,7 @@ #include #include +#include /* * Size of a cn_msg followed by a proc_event structure. Since the @@ -54,10 +55,11 @@ static struct cb_id cn_proc_event_id = { /* proc_event_counts is used as the sequence number of the netlink message */ static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; +static DEFINE_LOCAL_IRQ_LOCK(send_msg_lock); static inline void send_msg(struct cn_msg *msg) { - preempt_disable(); + local_lock(send_msg_lock); msg->seq = __this_cpu_inc_return(proc_event_counts) - 1; ((struct proc_event *)msg->data)->cpu = smp_processor_id(); @@ -70,7 +72,7 @@ static inline void send_msg(struct cn_ms */ cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_NOWAIT); - preempt_enable(); + local_unlock(send_msg_lock); } void proc_fork_connector(struct task_struct *task) Index: linux-4.14.15-rt12/drivers/cpufreq/Kconfig.x86 =================================================================== --- linux-4.14.15-rt12.orig/drivers/cpufreq/Kconfig.x86 +++ linux-4.14.15-rt12/drivers/cpufreq/Kconfig.x86 @@ -125,7 +125,7 @@ config X86_POWERNOW_K7_ACPI config X86_POWERNOW_K8 tristate "AMD Opteron/Athlon64 PowerNow!" - depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ + depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ && !PREEMPT_RT_BASE help This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. Support for K10 and newer processors is now in acpi-cpufreq. Index: linux-4.14.15-rt12/drivers/gpu/drm/i915/i915_gem_timeline.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/gpu/drm/i915/i915_gem_timeline.c +++ linux-4.14.15-rt12/drivers/gpu/drm/i915/i915_gem_timeline.c @@ -33,11 +33,8 @@ static void __intel_timeline_init(struct { tl->fence_context = context; tl->common = parent; -#ifdef CONFIG_DEBUG_SPINLOCK - __raw_spin_lock_init(&tl->lock.rlock, lockname, lockclass); -#else spin_lock_init(&tl->lock); -#endif + lockdep_set_class_and_name(&tl->lock, lockclass, lockname); init_request_active(&tl->last_request, NULL); INIT_LIST_HEAD(&tl->requests); i915_syncmap_init(&tl->sync); Index: linux-4.14.15-rt12/drivers/gpu/drm/i915/i915_irq.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/gpu/drm/i915/i915_irq.c +++ linux-4.14.15-rt12/drivers/gpu/drm/i915/i915_irq.c @@ -867,6 +867,7 @@ static bool i915_get_crtc_scanoutpos(str spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */ + preempt_disable_rt(); /* Get optional system timestamp before query. */ if (stime) @@ -918,6 +919,7 @@ static bool i915_get_crtc_scanoutpos(str *etime = ktime_get(); /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */ + preempt_enable_rt(); spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); Index: linux-4.14.15-rt12/drivers/gpu/drm/i915/intel_sprite.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/gpu/drm/i915/intel_sprite.c +++ linux-4.14.15-rt12/drivers/gpu/drm/i915/intel_sprite.c @@ -36,6 +36,7 @@ #include #include #include +#include #include "intel_drv.h" #include "intel_frontbuffer.h" #include @@ -67,7 +68,7 @@ int intel_usecs_to_scanlines(const struc } #define VBLANK_EVASION_TIME_US 100 - +static DEFINE_LOCAL_IRQ_LOCK(pipe_update_lock); /** * intel_pipe_update_start() - start update of a set of display registers * @crtc: the crtc of which the registers are going to be updated @@ -102,7 +103,7 @@ void intel_pipe_update_start(struct inte VBLANK_EVASION_TIME_US); max = vblank_start - 1; - local_irq_disable(); + local_lock_irq(pipe_update_lock); if (min <= 0 || max <= 0) return; @@ -132,11 +133,11 @@ void intel_pipe_update_start(struct inte break; } - local_irq_enable(); + local_unlock_irq(pipe_update_lock); timeout = schedule_timeout(timeout); - local_irq_disable(); + local_lock_irq(pipe_update_lock); } finish_wait(wq, &wait); @@ -201,7 +202,7 @@ void intel_pipe_update_end(struct intel_ crtc->base.state->event = NULL; } - local_irq_enable(); + local_unlock_irq(pipe_update_lock); if (intel_vgpu_active(dev_priv)) return; Index: linux-4.14.15-rt12/drivers/gpu/drm/radeon/radeon_display.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/gpu/drm/radeon/radeon_display.c +++ linux-4.14.15-rt12/drivers/gpu/drm/radeon/radeon_display.c @@ -1839,6 +1839,7 @@ int radeon_get_crtc_scanoutpos(struct dr struct radeon_device *rdev = dev->dev_private; /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */ + preempt_disable_rt(); /* Get optional system timestamp before query. */ if (stime) @@ -1931,6 +1932,7 @@ int radeon_get_crtc_scanoutpos(struct dr *etime = ktime_get(); /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */ + preempt_enable_rt(); /* Decode into vertical and horizontal scanout position. */ *vpos = position & 0x1fff; Index: linux-4.14.15-rt12/drivers/hv/vmbus_drv.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/hv/vmbus_drv.c +++ linux-4.14.15-rt12/drivers/hv/vmbus_drv.c @@ -966,6 +966,8 @@ static void vmbus_isr(void) void *page_addr = hv_cpu->synic_event_page; struct hv_message *msg; union hv_synic_event_flags *event; + struct pt_regs *regs = get_irq_regs(); + u64 ip = regs ? instruction_pointer(regs) : 0; bool handled = false; if (unlikely(page_addr == NULL)) @@ -1009,7 +1011,7 @@ static void vmbus_isr(void) tasklet_schedule(&hv_cpu->msg_dpc); } - add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0); + add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0, ip); } Index: linux-4.14.15-rt12/drivers/ide/alim15x3.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/ide/alim15x3.c +++ linux-4.14.15-rt12/drivers/ide/alim15x3.c @@ -234,7 +234,7 @@ static int init_chipset_ali15x3(struct p isa_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL); - local_irq_save(flags); + local_irq_save_nort(flags); if (m5229_revision < 0xC2) { /* @@ -325,7 +325,7 @@ out: } pci_dev_put(north); pci_dev_put(isa_dev); - local_irq_restore(flags); + local_irq_restore_nort(flags); return 0; } Index: linux-4.14.15-rt12/drivers/ide/hpt366.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/ide/hpt366.c +++ linux-4.14.15-rt12/drivers/ide/hpt366.c @@ -1236,7 +1236,7 @@ static int init_dma_hpt366(ide_hwif_t *h dma_old = inb(base + 2); - local_irq_save(flags); + local_irq_save_nort(flags); dma_new = dma_old; pci_read_config_byte(dev, hwif->channel ? 0x4b : 0x43, &masterdma); @@ -1247,7 +1247,7 @@ static int init_dma_hpt366(ide_hwif_t *h if (dma_new != dma_old) outb(dma_new, base + 2); - local_irq_restore(flags); + local_irq_restore_nort(flags); printk(KERN_INFO " %s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name, base, base + 7); Index: linux-4.14.15-rt12/drivers/ide/ide-io-std.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/ide/ide-io-std.c +++ linux-4.14.15-rt12/drivers/ide/ide-io-std.c @@ -175,7 +175,7 @@ void ide_input_data(ide_drive_t *drive, unsigned long uninitialized_var(flags); if ((io_32bit & 2) && !mmio) { - local_irq_save(flags); + local_irq_save_nort(flags); ata_vlb_sync(io_ports->nsect_addr); } @@ -186,7 +186,7 @@ void ide_input_data(ide_drive_t *drive, insl(data_addr, buf, words); if ((io_32bit & 2) && !mmio) - local_irq_restore(flags); + local_irq_restore_nort(flags); if (((len + 1) & 3) < 2) return; @@ -219,7 +219,7 @@ void ide_output_data(ide_drive_t *drive, unsigned long uninitialized_var(flags); if ((io_32bit & 2) && !mmio) { - local_irq_save(flags); + local_irq_save_nort(flags); ata_vlb_sync(io_ports->nsect_addr); } @@ -230,7 +230,7 @@ void ide_output_data(ide_drive_t *drive, outsl(data_addr, buf, words); if ((io_32bit & 2) && !mmio) - local_irq_restore(flags); + local_irq_restore_nort(flags); if (((len + 1) & 3) < 2) return; Index: linux-4.14.15-rt12/drivers/ide/ide-io.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/ide/ide-io.c +++ linux-4.14.15-rt12/drivers/ide/ide-io.c @@ -660,7 +660,7 @@ void ide_timer_expiry (unsigned long dat /* disable_irq_nosync ?? */ disable_irq(hwif->irq); /* local CPU only, as if we were handling an interrupt */ - local_irq_disable(); + local_irq_disable_nort(); if (hwif->polling) { startstop = handler(drive); } else if (drive_is_ready(drive)) { Index: linux-4.14.15-rt12/drivers/ide/ide-iops.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/ide/ide-iops.c +++ linux-4.14.15-rt12/drivers/ide/ide-iops.c @@ -129,12 +129,12 @@ int __ide_wait_stat(ide_drive_t *drive, if ((stat & ATA_BUSY) == 0) break; - local_irq_restore(flags); + local_irq_restore_nort(flags); *rstat = stat; return -EBUSY; } } - local_irq_restore(flags); + local_irq_restore_nort(flags); } /* * Allow status to settle, then read it again. Index: linux-4.14.15-rt12/drivers/ide/ide-probe.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/ide/ide-probe.c +++ linux-4.14.15-rt12/drivers/ide/ide-probe.c @@ -196,10 +196,10 @@ static void do_identify(ide_drive_t *dri int bswap = 1; /* local CPU only; some systems need this */ - local_irq_save(flags); + local_irq_save_nort(flags); /* read 512 bytes of id info */ hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE); - local_irq_restore(flags); + local_irq_restore_nort(flags); drive->dev_flags |= IDE_DFLAG_ID_READ; #ifdef DEBUG Index: linux-4.14.15-rt12/drivers/ide/ide-taskfile.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/ide/ide-taskfile.c +++ linux-4.14.15-rt12/drivers/ide/ide-taskfile.c @@ -251,7 +251,7 @@ void ide_pio_bytes(ide_drive_t *drive, s page_is_high = PageHighMem(page); if (page_is_high) - local_irq_save(flags); + local_irq_save_nort(flags); buf = kmap_atomic(page) + offset; @@ -272,7 +272,7 @@ void ide_pio_bytes(ide_drive_t *drive, s kunmap_atomic(buf); if (page_is_high) - local_irq_restore(flags); + local_irq_restore_nort(flags); len -= nr_bytes; } @@ -415,7 +415,7 @@ static ide_startstop_t pre_task_out_intr } if ((drive->dev_flags & IDE_DFLAG_UNMASK) == 0) - local_irq_disable(); + local_irq_disable_nort(); ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE); Index: linux-4.14.15-rt12/drivers/infiniband/hw/hfi1/affinity.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/infiniband/hw/hfi1/affinity.c +++ linux-4.14.15-rt12/drivers/infiniband/hw/hfi1/affinity.c @@ -576,7 +576,7 @@ int hfi1_get_proc_affinity(int node) struct hfi1_affinity_node *entry; cpumask_var_t diff, hw_thread_mask, available_mask, intrs_mask; const struct cpumask *node_mask, - *proc_mask = ¤t->cpus_allowed; + *proc_mask = current->cpus_ptr; struct hfi1_affinity_node_list *affinity = &node_affinity; struct cpu_mask_set *set = &affinity->proc; @@ -584,7 +584,7 @@ int hfi1_get_proc_affinity(int node) * check whether process/context affinity has already * been set */ - if (cpumask_weight(proc_mask) == 1) { + if (current->nr_cpus_allowed == 1) { hfi1_cdbg(PROC, "PID %u %s affinity set to CPU %*pbl", current->pid, current->comm, cpumask_pr_args(proc_mask)); @@ -595,7 +595,7 @@ int hfi1_get_proc_affinity(int node) cpu = cpumask_first(proc_mask); cpumask_set_cpu(cpu, &set->used); goto done; - } else if (cpumask_weight(proc_mask) < cpumask_weight(&set->mask)) { + } else if (current->nr_cpus_allowed < cpumask_weight(&set->mask)) { hfi1_cdbg(PROC, "PID %u %s affinity set to CPU set(s) %*pbl", current->pid, current->comm, cpumask_pr_args(proc_mask)); Index: linux-4.14.15-rt12/drivers/infiniband/hw/hfi1/sdma.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/infiniband/hw/hfi1/sdma.c +++ linux-4.14.15-rt12/drivers/infiniband/hw/hfi1/sdma.c @@ -856,14 +856,13 @@ struct sdma_engine *sdma_select_user_eng { struct sdma_rht_node *rht_node; struct sdma_engine *sde = NULL; - const struct cpumask *current_mask = ¤t->cpus_allowed; unsigned long cpu_id; /* * To ensure that always the same sdma engine(s) will be * selected make sure the process is pinned to this CPU only. */ - if (cpumask_weight(current_mask) != 1) + if (current->nr_cpus_allowed != 1) goto out; cpu_id = smp_processor_id(); Index: linux-4.14.15-rt12/drivers/infiniband/hw/qib/qib_file_ops.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/infiniband/hw/qib/qib_file_ops.c +++ linux-4.14.15-rt12/drivers/infiniband/hw/qib/qib_file_ops.c @@ -1163,7 +1163,7 @@ static unsigned int qib_poll(struct file static void assign_ctxt_affinity(struct file *fp, struct qib_devdata *dd) { struct qib_filedata *fd = fp->private_data; - const unsigned int weight = cpumask_weight(¤t->cpus_allowed); + const unsigned int weight = current->nr_cpus_allowed; const struct cpumask *local_mask = cpumask_of_pcibus(dd->pcidev->bus); int local_cpu; @@ -1644,9 +1644,8 @@ static int qib_assign_ctxt(struct file * ret = find_free_ctxt(i_minor - 1, fp, uinfo); else { int unit; - const unsigned int cpu = cpumask_first(¤t->cpus_allowed); - const unsigned int weight = - cpumask_weight(¤t->cpus_allowed); + const unsigned int cpu = cpumask_first(current->cpus_ptr); + const unsigned int weight = current->nr_cpus_allowed; if (weight == 1 && !test_bit(cpu, qib_cpulist)) if (!find_hca(cpu, &unit) && unit >= 0) Index: linux-4.14.15-rt12/drivers/infiniband/ulp/ipoib/ipoib_multicast.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/infiniband/ulp/ipoib/ipoib_multicast.c +++ linux-4.14.15-rt12/drivers/infiniband/ulp/ipoib/ipoib_multicast.c @@ -898,7 +898,7 @@ void ipoib_mcast_restart_task(struct wor ipoib_dbg_mcast(priv, "restarting multicast task\n"); - local_irq_save(flags); + local_irq_save_nort(flags); netif_addr_lock(dev); spin_lock(&priv->lock); @@ -980,7 +980,7 @@ void ipoib_mcast_restart_task(struct wor spin_unlock(&priv->lock); netif_addr_unlock(dev); - local_irq_restore(flags); + local_irq_restore_nort(flags); ipoib_mcast_remove_list(&remove_list); Index: linux-4.14.15-rt12/drivers/input/gameport/gameport.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/input/gameport/gameport.c +++ linux-4.14.15-rt12/drivers/input/gameport/gameport.c @@ -91,13 +91,13 @@ static int gameport_measure_speed(struct tx = ~0; for (i = 0; i < 50; i++) { - local_irq_save(flags); + local_irq_save_nort(flags); t1 = ktime_get_ns(); for (t = 0; t < 50; t++) gameport_read(gameport); t2 = ktime_get_ns(); t3 = ktime_get_ns(); - local_irq_restore(flags); + local_irq_restore_nort(flags); udelay(i * 10); t = (t2 - t1) - (t3 - t2); if (t < tx) @@ -124,12 +124,12 @@ static int old_gameport_measure_speed(st tx = 1 << 30; for(i = 0; i < 50; i++) { - local_irq_save(flags); + local_irq_save_nort(flags); GET_TIME(t1); for (t = 0; t < 50; t++) gameport_read(gameport); GET_TIME(t2); GET_TIME(t3); - local_irq_restore(flags); + local_irq_restore_nort(flags); udelay(i * 10); if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; } @@ -148,11 +148,11 @@ static int old_gameport_measure_speed(st tx = 1 << 30; for(i = 0; i < 50; i++) { - local_irq_save(flags); + local_irq_save_nort(flags); t1 = rdtsc(); for (t = 0; t < 50; t++) gameport_read(gameport); t2 = rdtsc(); - local_irq_restore(flags); + local_irq_restore_nort(flags); udelay(i * 10); if (t2 - t1 < tx) tx = t2 - t1; } Index: linux-4.14.15-rt12/drivers/iommu/amd_iommu.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/iommu/amd_iommu.c +++ linux-4.14.15-rt12/drivers/iommu/amd_iommu.c @@ -1944,10 +1944,10 @@ static int __attach_device(struct iommu_ int ret; /* - * Must be called with IRQs disabled. Warn here to detect early - * when its not. + * Must be called with IRQs disabled on a non RT kernel. Warn here to + * detect early when its not. */ - WARN_ON(!irqs_disabled()); + WARN_ON_NONRT(!irqs_disabled()); /* lock domain */ spin_lock(&domain->lock); @@ -2115,10 +2115,10 @@ static void __detach_device(struct iommu struct protection_domain *domain; /* - * Must be called with IRQs disabled. Warn here to detect early - * when its not. + * Must be called with IRQs disabled on a non RT kernel. Warn here to + * detect early when its not. */ - WARN_ON(!irqs_disabled()); + WARN_ON_NONRT(!irqs_disabled()); if (WARN_ON(!dev_data->domain)) return; Index: linux-4.14.15-rt12/drivers/iommu/iova.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/iommu/iova.c +++ linux-4.14.15-rt12/drivers/iommu/iova.c @@ -570,7 +570,7 @@ void queue_iova(struct iova_domain *iova unsigned long pfn, unsigned long pages, unsigned long data) { - struct iova_fq *fq = get_cpu_ptr(iovad->fq); + struct iova_fq *fq = raw_cpu_ptr(iovad->fq); unsigned long flags; unsigned idx; @@ -600,8 +600,6 @@ void queue_iova(struct iova_domain *iova if (atomic_cmpxchg(&iovad->fq_timer_on, 0, 1) == 0) mod_timer(&iovad->fq_timer, jiffies + msecs_to_jiffies(IOVA_FQ_TIMEOUT)); - - put_cpu_ptr(iovad->fq); } EXPORT_SYMBOL_GPL(queue_iova); Index: linux-4.14.15-rt12/drivers/leds/trigger/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/drivers/leds/trigger/Kconfig +++ linux-4.14.15-rt12/drivers/leds/trigger/Kconfig @@ -69,7 +69,7 @@ config LEDS_TRIGGER_BACKLIGHT config LEDS_TRIGGER_CPU bool "LED CPU Trigger" - depends on LEDS_TRIGGERS + depends on LEDS_TRIGGERS && !PREEMPT_RT_BASE help This allows LEDs to be controlled by active CPUs. This shows the active CPUs across an array of LEDs so you can see which Index: linux-4.14.15-rt12/drivers/md/bcache/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/drivers/md/bcache/Kconfig +++ linux-4.14.15-rt12/drivers/md/bcache/Kconfig @@ -1,6 +1,7 @@ config BCACHE tristate "Block device as cache" + depends on !PREEMPT_RT_FULL ---help--- Allows a block device to be used as cache for other devices; uses a btree for indexing and the layout is optimized for SSDs. Index: linux-4.14.15-rt12/drivers/md/dm-rq.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/md/dm-rq.c +++ linux-4.14.15-rt12/drivers/md/dm-rq.c @@ -671,7 +671,7 @@ static void dm_old_request_fn(struct req /* Establish tio->ti before queuing work (map_tio_request) */ tio->ti = ti; kthread_queue_work(&md->kworker, &tio->work); - BUG_ON(!irqs_disabled()); + BUG_ON_NONRT(!irqs_disabled()); } } Index: linux-4.14.15-rt12/drivers/md/raid5.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/md/raid5.c +++ linux-4.14.15-rt12/drivers/md/raid5.c @@ -410,7 +410,7 @@ void raid5_release_stripe(struct stripe_ md_wakeup_thread(conf->mddev->thread); return; slow_path: - local_irq_save(flags); + local_irq_save_nort(flags); /* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */ if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) { INIT_LIST_HEAD(&list); @@ -419,7 +419,7 @@ slow_path: spin_unlock(&conf->device_lock); release_inactive_stripe_list(conf, &list, hash); } - local_irq_restore(flags); + local_irq_restore_nort(flags); } static inline void remove_hash(struct stripe_head *sh) @@ -2067,8 +2067,9 @@ static void raid_run_ops(struct stripe_h struct raid5_percpu *percpu; unsigned long cpu; - cpu = get_cpu(); + cpu = get_cpu_light(); percpu = per_cpu_ptr(conf->percpu, cpu); + spin_lock(&percpu->lock); if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) { ops_run_biofill(sh); overlap_clear++; @@ -2127,7 +2128,8 @@ static void raid_run_ops(struct stripe_h if (test_and_clear_bit(R5_Overlap, &dev->flags)) wake_up(&sh->raid_conf->wait_for_overlap); } - put_cpu(); + spin_unlock(&percpu->lock); + put_cpu_light(); } static void free_stripe(struct kmem_cache *sc, struct stripe_head *sh) @@ -6796,6 +6798,7 @@ static int raid456_cpu_up_prepare(unsign __func__, cpu); return -ENOMEM; } + spin_lock_init(&per_cpu_ptr(conf->percpu, cpu)->lock); return 0; } @@ -6806,7 +6809,6 @@ static int raid5_alloc_percpu(struct r5c conf->percpu = alloc_percpu(struct raid5_percpu); if (!conf->percpu) return -ENOMEM; - err = cpuhp_state_add_instance(CPUHP_MD_RAID5_PREPARE, &conf->node); if (!err) { conf->scribble_disks = max(conf->raid_disks, Index: linux-4.14.15-rt12/drivers/md/raid5.h =================================================================== --- linux-4.14.15-rt12.orig/drivers/md/raid5.h +++ linux-4.14.15-rt12/drivers/md/raid5.h @@ -624,6 +624,7 @@ struct r5conf { int recovery_disabled; /* per cpu variables */ struct raid5_percpu { + spinlock_t lock; /* Protection for -RT */ struct page *spare_page; /* Used when checking P/Q in raid6 */ struct flex_array *scribble; /* space for constructing buffer * lists and performing address Index: linux-4.14.15-rt12/drivers/mfd/atmel-smc.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/mfd/atmel-smc.c +++ linux-4.14.15-rt12/drivers/mfd/atmel-smc.c @@ -12,6 +12,7 @@ */ #include +#include /** * atmel_smc_cs_conf_init - initialize a SMC CS conf Index: linux-4.14.15-rt12/drivers/misc/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/drivers/misc/Kconfig +++ linux-4.14.15-rt12/drivers/misc/Kconfig @@ -54,6 +54,7 @@ config AD525X_DPOT_SPI config ATMEL_TCLIB bool "Atmel AT32/AT91 Timer/Counter Library" depends on (AVR32 || ARCH_AT91) + default y if PREEMPT_RT_FULL help Select this if you want a library to allocate the Timer/Counter blocks found on many Atmel processors. This facilitates using @@ -69,8 +70,7 @@ config ATMEL_TCB_CLKSRC are combined to make a single 32-bit timer. When GENERIC_CLOCKEVENTS is defined, the third timer channel - may be used as a clock event device supporting oneshot mode - (delays of up to two seconds) based on the 32 KiHz clock. + may be used as a clock event device supporting oneshot mode. config ATMEL_TCB_CLKSRC_BLOCK int @@ -84,6 +84,15 @@ config ATMEL_TCB_CLKSRC_BLOCK TC can be used for other purposes, such as PWM generation and interval timing. +config ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK + bool "TC Block use 32 KiHz clock" + depends on ATMEL_TCB_CLKSRC + default y if !PREEMPT_RT_FULL + help + Select this to use 32 KiHz base clock rate as TC block clock + source for clock events. + + config DUMMY_IRQ tristate "Dummy IRQ handler" default n Index: linux-4.14.15-rt12/drivers/mmc/host/mmci.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/mmc/host/mmci.c +++ linux-4.14.15-rt12/drivers/mmc/host/mmci.c @@ -1200,15 +1200,12 @@ static irqreturn_t mmci_pio_irq(int irq, struct sg_mapping_iter *sg_miter = &host->sg_miter; struct variant_data *variant = host->variant; void __iomem *base = host->base; - unsigned long flags; u32 status; status = readl(base + MMCISTATUS); dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status); - local_irq_save(flags); - do { unsigned int remain, len; char *buffer; @@ -1248,8 +1245,6 @@ static irqreturn_t mmci_pio_irq(int irq, sg_miter_stop(sg_miter); - local_irq_restore(flags); - /* * If we have less than the fifo 'half-full' threshold to transfer, * trigger a PIO interrupt as soon as any data is available. Index: linux-4.14.15-rt12/drivers/net/ethernet/3com/3c59x.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/net/ethernet/3com/3c59x.c +++ linux-4.14.15-rt12/drivers/net/ethernet/3com/3c59x.c @@ -842,9 +842,9 @@ static void poll_vortex(struct net_devic { struct vortex_private *vp = netdev_priv(dev); unsigned long flags; - local_irq_save(flags); + local_irq_save_nort(flags); (vp->full_bus_master_rx ? boomerang_interrupt:vortex_interrupt)(dev->irq,dev); - local_irq_restore(flags); + local_irq_restore_nort(flags); } #endif @@ -1908,12 +1908,12 @@ static void vortex_tx_timeout(struct net * Block interrupts because vortex_interrupt does a bare spin_lock() */ unsigned long flags; - local_irq_save(flags); + local_irq_save_nort(flags); if (vp->full_bus_master_tx) boomerang_interrupt(dev->irq, dev); else vortex_interrupt(dev->irq, dev); - local_irq_restore(flags); + local_irq_restore_nort(flags); } } Index: linux-4.14.15-rt12/drivers/net/ethernet/marvell/mvpp2.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/net/ethernet/marvell/mvpp2.c +++ linux-4.14.15-rt12/drivers/net/ethernet/marvell/mvpp2.c @@ -830,9 +830,8 @@ struct mvpp2_pcpu_stats { /* Per-CPU port control */ struct mvpp2_port_pcpu { struct hrtimer tx_done_timer; + struct net_device *dev; bool timer_scheduled; - /* Tasklet for egress finalization */ - struct tasklet_struct tx_done_tasklet; }; struct mvpp2_queue_vector { @@ -5954,46 +5953,34 @@ static void mvpp2_link_event(struct net_ } } -static void mvpp2_timer_set(struct mvpp2_port_pcpu *port_pcpu) -{ - ktime_t interval; - - if (!port_pcpu->timer_scheduled) { - port_pcpu->timer_scheduled = true; - interval = MVPP2_TXDONE_HRTIMER_PERIOD_NS; - hrtimer_start(&port_pcpu->tx_done_timer, interval, - HRTIMER_MODE_REL_PINNED); - } -} - -static void mvpp2_tx_proc_cb(unsigned long data) +static enum hrtimer_restart mvpp2_hr_timer_cb(struct hrtimer *timer) { - struct net_device *dev = (struct net_device *)data; - struct mvpp2_port *port = netdev_priv(dev); - struct mvpp2_port_pcpu *port_pcpu = this_cpu_ptr(port->pcpu); + struct net_device *dev; + struct mvpp2_port *port; + struct mvpp2_port_pcpu *port_pcpu; unsigned int tx_todo, cause; + port_pcpu = container_of(timer, struct mvpp2_port_pcpu, tx_done_timer); + dev = port_pcpu->dev; + if (!netif_running(dev)) - return; + return HRTIMER_NORESTART; + port_pcpu->timer_scheduled = false; + port = netdev_priv(dev); /* Process all the Tx queues */ cause = (1 << port->ntxqs) - 1; tx_todo = mvpp2_tx_done(port, cause, smp_processor_id()); /* Set the timer in case not all the packets were processed */ - if (tx_todo) - mvpp2_timer_set(port_pcpu); -} - -static enum hrtimer_restart mvpp2_hr_timer_cb(struct hrtimer *timer) -{ - struct mvpp2_port_pcpu *port_pcpu = container_of(timer, - struct mvpp2_port_pcpu, - tx_done_timer); - - tasklet_schedule(&port_pcpu->tx_done_tasklet); + if (tx_todo && !port_pcpu->timer_scheduled) { + port_pcpu->timer_scheduled = true; + hrtimer_forward_now(&port_pcpu->tx_done_timer, + MVPP2_TXDONE_HRTIMER_PERIOD_NS); + return HRTIMER_RESTART; + } return HRTIMER_NORESTART; } @@ -6482,7 +6469,12 @@ out: txq_pcpu->count > 0) { struct mvpp2_port_pcpu *port_pcpu = this_cpu_ptr(port->pcpu); - mvpp2_timer_set(port_pcpu); + if (!port_pcpu->timer_scheduled) { + port_pcpu->timer_scheduled = true; + hrtimer_start(&port_pcpu->tx_done_timer, + MVPP2_TXDONE_HRTIMER_PERIOD_NS, + HRTIMER_MODE_REL_PINNED_SOFT); + } } return NETDEV_TX_OK; @@ -6871,7 +6863,6 @@ static int mvpp2_stop(struct net_device hrtimer_cancel(&port_pcpu->tx_done_timer); port_pcpu->timer_scheduled = false; - tasklet_kill(&port_pcpu->tx_done_tasklet); } } mvpp2_cleanup_rxqs(port); @@ -7644,13 +7635,10 @@ static int mvpp2_port_probe(struct platf port_pcpu = per_cpu_ptr(port->pcpu, cpu); hrtimer_init(&port_pcpu->tx_done_timer, CLOCK_MONOTONIC, - HRTIMER_MODE_REL_PINNED); + HRTIMER_MODE_REL_PINNED_SOFT); port_pcpu->tx_done_timer.function = mvpp2_hr_timer_cb; port_pcpu->timer_scheduled = false; - - tasklet_init(&port_pcpu->tx_done_tasklet, - mvpp2_tx_proc_cb, - (unsigned long)dev); + port_pcpu->dev = dev; } } Index: linux-4.14.15-rt12/drivers/net/ethernet/realtek/8139too.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/net/ethernet/realtek/8139too.c +++ linux-4.14.15-rt12/drivers/net/ethernet/realtek/8139too.c @@ -2224,7 +2224,7 @@ static void rtl8139_poll_controller(stru struct rtl8139_private *tp = netdev_priv(dev); const int irq = tp->pci_dev->irq; - disable_irq(irq); + disable_irq_nosync(irq); rtl8139_interrupt(irq, dev); enable_irq(irq); } Index: linux-4.14.15-rt12/drivers/net/wireless/intersil/orinoco/orinoco_usb.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/net/wireless/intersil/orinoco/orinoco_usb.c +++ linux-4.14.15-rt12/drivers/net/wireless/intersil/orinoco/orinoco_usb.c @@ -697,7 +697,7 @@ static void ezusb_req_ctx_wait(struct ez while (!ctx->done.done && msecs--) udelay(1000); } else { - wait_event_interruptible(ctx->done.wait, + swait_event_interruptible(ctx->done.wait, ctx->done.done); } break; Index: linux-4.14.15-rt12/drivers/net/wireless/mac80211_hwsim.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/net/wireless/mac80211_hwsim.c +++ linux-4.14.15-rt12/drivers/net/wireless/mac80211_hwsim.c @@ -537,7 +537,7 @@ struct mac80211_hwsim_data { unsigned int rx_filter; bool started, idle, scanning; struct mutex mutex; - struct tasklet_hrtimer beacon_timer; + struct hrtimer beacon_timer; enum ps_mode { PS_DISABLED, PS_ENABLED, PS_AUTO_POLL, PS_MANUAL_POLL } ps; @@ -1423,7 +1423,7 @@ static void mac80211_hwsim_stop(struct i { struct mac80211_hwsim_data *data = hw->priv; data->started = false; - tasklet_hrtimer_cancel(&data->beacon_timer); + hrtimer_cancel(&data->beacon_timer); wiphy_debug(hw->wiphy, "%s\n", __func__); } @@ -1546,14 +1546,12 @@ static enum hrtimer_restart mac80211_hwsim_beacon(struct hrtimer *timer) { struct mac80211_hwsim_data *data = - container_of(timer, struct mac80211_hwsim_data, - beacon_timer.timer); + container_of(timer, struct mac80211_hwsim_data, beacon_timer); struct ieee80211_hw *hw = data->hw; u64 bcn_int = data->beacon_int; - ktime_t next_bcn; if (!data->started) - goto out; + return HRTIMER_NORESTART; ieee80211_iterate_active_interfaces_atomic( hw, IEEE80211_IFACE_ITER_NORMAL, @@ -1565,11 +1563,9 @@ mac80211_hwsim_beacon(struct hrtimer *ti data->bcn_delta = 0; } - next_bcn = ktime_add(hrtimer_get_expires(timer), - ns_to_ktime(bcn_int * 1000)); - tasklet_hrtimer_start(&data->beacon_timer, next_bcn, HRTIMER_MODE_ABS); -out: - return HRTIMER_NORESTART; + hrtimer_forward(&data->beacon_timer, hrtimer_get_expires(timer), + ns_to_ktime(bcn_int * NSEC_PER_USEC)); + return HRTIMER_RESTART; } static const char * const hwsim_chanwidths[] = { @@ -1643,15 +1639,15 @@ static int mac80211_hwsim_config(struct mutex_unlock(&data->mutex); if (!data->started || !data->beacon_int) - tasklet_hrtimer_cancel(&data->beacon_timer); - else if (!hrtimer_is_queued(&data->beacon_timer.timer)) { + hrtimer_cancel(&data->beacon_timer); + else if (!hrtimer_is_queued(&data->beacon_timer)) { u64 tsf = mac80211_hwsim_get_tsf(hw, NULL); u32 bcn_int = data->beacon_int; u64 until_tbtt = bcn_int - do_div(tsf, bcn_int); - tasklet_hrtimer_start(&data->beacon_timer, - ns_to_ktime(until_tbtt * 1000), - HRTIMER_MODE_REL); + hrtimer_start(&data->beacon_timer, + ns_to_ktime(until_tbtt * 1000), + HRTIMER_MODE_REL_SOFT); } return 0; @@ -1714,7 +1710,7 @@ static void mac80211_hwsim_bss_info_chan info->enable_beacon, info->beacon_int); vp->bcn_en = info->enable_beacon; if (data->started && - !hrtimer_is_queued(&data->beacon_timer.timer) && + !hrtimer_is_queued(&data->beacon_timer) && info->enable_beacon) { u64 tsf, until_tbtt; u32 bcn_int; @@ -1722,9 +1718,9 @@ static void mac80211_hwsim_bss_info_chan tsf = mac80211_hwsim_get_tsf(hw, vif); bcn_int = data->beacon_int; until_tbtt = bcn_int - do_div(tsf, bcn_int); - tasklet_hrtimer_start(&data->beacon_timer, - ns_to_ktime(until_tbtt * 1000), - HRTIMER_MODE_REL); + hrtimer_start(&data->beacon_timer, + ns_to_ktime(until_tbtt * 1000), + HRTIMER_MODE_REL_SOFT); } else if (!info->enable_beacon) { unsigned int count = 0; ieee80211_iterate_active_interfaces_atomic( @@ -1733,7 +1729,7 @@ static void mac80211_hwsim_bss_info_chan wiphy_debug(hw->wiphy, " beaconing vifs remaining: %u", count); if (count == 0) { - tasklet_hrtimer_cancel(&data->beacon_timer); + hrtimer_cancel(&data->beacon_timer); data->beacon_int = 0; } } @@ -2725,9 +2721,9 @@ static int mac80211_hwsim_new_radio(stru data->debugfs, data, &hwsim_simulate_radar); - tasklet_hrtimer_init(&data->beacon_timer, - mac80211_hwsim_beacon, - CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + hrtimer_init(&data->beacon_timer, CLOCK_MONOTONIC, + HRTIMER_MODE_ABS_SOFT); + data->beacon_timer.function = mac80211_hwsim_beacon; spin_lock_bh(&hwsim_radio_lock); list_add_tail(&data->list, &hwsim_radios); Index: linux-4.14.15-rt12/drivers/pci/switch/switchtec.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/pci/switch/switchtec.c +++ linux-4.14.15-rt12/drivers/pci/switch/switchtec.c @@ -306,10 +306,11 @@ struct switchtec_user { enum mrpc_state state; - struct completion comp; + wait_queue_head_t cmd_comp; struct kref kref; struct list_head list; + bool cmd_done; u32 cmd; u32 status; u32 return_code; @@ -331,7 +332,7 @@ static struct switchtec_user *stuser_cre stuser->stdev = stdev; kref_init(&stuser->kref); INIT_LIST_HEAD(&stuser->list); - init_completion(&stuser->comp); + init_waitqueue_head(&stuser->cmd_comp); stuser->event_cnt = atomic_read(&stdev->event_cnt); dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser); @@ -414,7 +415,7 @@ static int mrpc_queue_cmd(struct switcht kref_get(&stuser->kref); stuser->read_len = sizeof(stuser->data); stuser_set_state(stuser, MRPC_QUEUED); - init_completion(&stuser->comp); + stuser->cmd_done = false; list_add_tail(&stuser->list, &stdev->mrpc_queue); mrpc_cmd_submit(stdev); @@ -451,7 +452,8 @@ static void mrpc_complete_cmd(struct swi stuser->read_len); out: - complete_all(&stuser->comp); + stuser->cmd_done = true; + wake_up_interruptible(&stuser->cmd_comp); list_del_init(&stuser->list); stuser_put(stuser); stdev->mrpc_busy = 0; @@ -721,10 +723,11 @@ static ssize_t switchtec_dev_read(struct mutex_unlock(&stdev->mrpc_mutex); if (filp->f_flags & O_NONBLOCK) { - if (!try_wait_for_completion(&stuser->comp)) + if (!READ_ONCE(stuser->cmd_done)) return -EAGAIN; } else { - rc = wait_for_completion_interruptible(&stuser->comp); + rc = wait_event_interruptible(stuser->cmd_comp, + stuser->cmd_done); if (rc < 0) return rc; } @@ -772,7 +775,7 @@ static unsigned int switchtec_dev_poll(s struct switchtec_dev *stdev = stuser->stdev; int ret = 0; - poll_wait(filp, &stuser->comp.wait, wait); + poll_wait(filp, &stuser->cmd_comp, wait); poll_wait(filp, &stdev->event_wq, wait); if (lock_mutex_and_test_alive(stdev)) @@ -780,7 +783,7 @@ static unsigned int switchtec_dev_poll(s mutex_unlock(&stdev->mrpc_mutex); - if (try_wait_for_completion(&stuser->comp)) + if (READ_ONCE(stuser->cmd_done)) ret |= POLLIN | POLLRDNORM; if (stuser->event_cnt != atomic_read(&stdev->event_cnt)) @@ -1255,7 +1258,8 @@ static void stdev_kill(struct switchtec_ /* Wake up and kill any users waiting on an MRPC request */ list_for_each_entry_safe(stuser, tmpuser, &stdev->mrpc_queue, list) { - complete_all(&stuser->comp); + stuser->cmd_done = true; + wake_up_interruptible(&stuser->cmd_comp); list_del_init(&stuser->list); stuser_put(stuser); } Index: linux-4.14.15-rt12/drivers/scsi/fcoe/fcoe.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/scsi/fcoe/fcoe.c +++ linux-4.14.15-rt12/drivers/scsi/fcoe/fcoe.c @@ -1464,11 +1464,11 @@ err2: static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen) { struct fcoe_percpu_s *fps; - int rc; + int rc, cpu = get_cpu_light(); - fps = &get_cpu_var(fcoe_percpu); + fps = &per_cpu(fcoe_percpu, cpu); rc = fcoe_get_paged_crc_eof(skb, tlen, fps); - put_cpu_var(fcoe_percpu); + put_cpu_light(); return rc; } @@ -1655,11 +1655,11 @@ static inline int fcoe_filter_frames(str return 0; } - stats = per_cpu_ptr(lport->stats, get_cpu()); + stats = per_cpu_ptr(lport->stats, get_cpu_light()); stats->InvalidCRCCount++; if (stats->InvalidCRCCount < 5) printk(KERN_WARNING "fcoe: dropping frame with CRC error\n"); - put_cpu(); + put_cpu_light(); return -EINVAL; } @@ -1702,7 +1702,7 @@ static void fcoe_recv_frame(struct sk_bu */ hp = (struct fcoe_hdr *) skb_network_header(skb); - stats = per_cpu_ptr(lport->stats, get_cpu()); + stats = per_cpu_ptr(lport->stats, get_cpu_light()); if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { if (stats->ErrorFrames < 5) printk(KERN_WARNING "fcoe: FCoE version " @@ -1734,13 +1734,13 @@ static void fcoe_recv_frame(struct sk_bu goto drop; if (!fcoe_filter_frames(lport, fp)) { - put_cpu(); + put_cpu_light(); fc_exch_recv(lport, fp); return; } drop: stats->ErrorFrames++; - put_cpu(); + put_cpu_light(); kfree_skb(skb); } Index: linux-4.14.15-rt12/drivers/scsi/fcoe/fcoe_ctlr.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/scsi/fcoe/fcoe_ctlr.c +++ linux-4.14.15-rt12/drivers/scsi/fcoe/fcoe_ctlr.c @@ -835,7 +835,7 @@ static unsigned long fcoe_ctlr_age_fcfs( INIT_LIST_HEAD(&del_list); - stats = per_cpu_ptr(fip->lp->stats, get_cpu()); + stats = per_cpu_ptr(fip->lp->stats, get_cpu_light()); list_for_each_entry_safe(fcf, next, &fip->fcfs, list) { deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2; @@ -871,7 +871,7 @@ static unsigned long fcoe_ctlr_age_fcfs( sel_time = fcf->time; } } - put_cpu(); + put_cpu_light(); list_for_each_entry_safe(fcf, next, &del_list, list) { /* Removes fcf from current list */ Index: linux-4.14.15-rt12/drivers/scsi/libfc/fc_exch.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/scsi/libfc/fc_exch.c +++ linux-4.14.15-rt12/drivers/scsi/libfc/fc_exch.c @@ -833,10 +833,10 @@ static struct fc_exch *fc_exch_em_alloc( } memset(ep, 0, sizeof(*ep)); - cpu = get_cpu(); + cpu = get_cpu_light(); pool = per_cpu_ptr(mp->pool, cpu); spin_lock_bh(&pool->lock); - put_cpu(); + put_cpu_light(); /* peek cache of free slot */ if (pool->left != FC_XID_UNKNOWN) { Index: linux-4.14.15-rt12/drivers/scsi/libsas/sas_ata.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/scsi/libsas/sas_ata.c +++ linux-4.14.15-rt12/drivers/scsi/libsas/sas_ata.c @@ -190,7 +190,7 @@ static unsigned int sas_ata_qc_issue(str /* TODO: audit callers to ensure they are ready for qc_issue to * unconditionally re-enable interrupts */ - local_irq_save(flags); + local_irq_save_nort(flags); spin_unlock(ap->lock); /* If the device fell off, no sense in issuing commands */ @@ -252,7 +252,7 @@ static unsigned int sas_ata_qc_issue(str out: spin_lock(ap->lock); - local_irq_restore(flags); + local_irq_restore_nort(flags); return ret; } Index: linux-4.14.15-rt12/drivers/scsi/qla2xxx/qla_inline.h =================================================================== --- linux-4.14.15-rt12.orig/drivers/scsi/qla2xxx/qla_inline.h +++ linux-4.14.15-rt12/drivers/scsi/qla2xxx/qla_inline.h @@ -59,12 +59,12 @@ qla2x00_poll(struct rsp_que *rsp) { unsigned long flags; struct qla_hw_data *ha = rsp->hw; - local_irq_save(flags); + local_irq_save_nort(flags); if (IS_P3P_TYPE(ha)) qla82xx_poll(0, rsp); else ha->isp_ops->intr_handler(0, rsp); - local_irq_restore(flags); + local_irq_restore_nort(flags); } static inline uint8_t * Index: linux-4.14.15-rt12/drivers/staging/greybus/audio_manager.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/staging/greybus/audio_manager.c +++ linux-4.14.15-rt12/drivers/staging/greybus/audio_manager.c @@ -10,7 +10,7 @@ #include #include #include -#include +#include #include #include "audio_manager.h" Index: linux-4.14.15-rt12/drivers/thermal/x86_pkg_temp_thermal.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/thermal/x86_pkg_temp_thermal.c +++ linux-4.14.15-rt12/drivers/thermal/x86_pkg_temp_thermal.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include @@ -329,7 +330,7 @@ static void pkg_thermal_schedule_work(in schedule_delayed_work_on(cpu, work, ms); } -static int pkg_thermal_notify(u64 msr_val) +static void pkg_thermal_notify_work(struct swork_event *event) { int cpu = smp_processor_id(); struct pkg_device *pkgdev; @@ -348,9 +349,47 @@ static int pkg_thermal_notify(u64 msr_va } spin_unlock_irqrestore(&pkg_temp_lock, flags); +} + +#ifdef CONFIG_PREEMPT_RT_FULL +static struct swork_event notify_work; + +static int pkg_thermal_notify_work_init(void) +{ + int err; + + err = swork_get(); + if (err) + return err; + + INIT_SWORK(¬ify_work, pkg_thermal_notify_work); return 0; } +static void pkg_thermal_notify_work_cleanup(void) +{ + swork_put(); +} + +static int pkg_thermal_notify(u64 msr_val) +{ + swork_queue(¬ify_work); + return 0; +} + +#else /* !CONFIG_PREEMPT_RT_FULL */ + +static int pkg_thermal_notify_work_init(void) { return 0; } + +static void pkg_thermal_notify_work_cleanup(void) { } + +static int pkg_thermal_notify(u64 msr_val) +{ + pkg_thermal_notify_work(NULL); + return 0; +} +#endif /* CONFIG_PREEMPT_RT_FULL */ + static int pkg_temp_thermal_device_add(unsigned int cpu) { int pkgid = topology_logical_package_id(cpu); @@ -515,10 +554,15 @@ static int __init pkg_temp_thermal_init( if (!x86_match_cpu(pkg_temp_thermal_ids)) return -ENODEV; + if (!pkg_thermal_notify_work_init()) + return -ENODEV; + max_packages = topology_max_packages(); packages = kzalloc(max_packages * sizeof(struct pkg_device *), GFP_KERNEL); - if (!packages) - return -ENOMEM; + if (!packages) { + ret = -ENOMEM; + goto err; + } ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "thermal/x86_pkg:online", pkg_thermal_cpu_online, pkg_thermal_cpu_offline); @@ -536,6 +580,7 @@ static int __init pkg_temp_thermal_init( return 0; err: + pkg_thermal_notify_work_cleanup(); kfree(packages); return ret; } @@ -549,6 +594,7 @@ static void __exit pkg_temp_thermal_exit cpuhp_remove_state(pkg_thermal_hp_state); debugfs_remove_recursive(debugfs); kfree(packages); + pkg_thermal_notify_work_cleanup(); } module_exit(pkg_temp_thermal_exit) Index: linux-4.14.15-rt12/drivers/tty/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/drivers/tty/Kconfig +++ linux-4.14.15-rt12/drivers/tty/Kconfig @@ -394,10 +394,14 @@ config GOLDFISH_TTY depends on GOLDFISH select SERIAL_CORE select SERIAL_CORE_CONSOLE - select SERIAL_EARLYCON help Console and system TTY driver for the Goldfish virtual platform. +config GOLDFISH_TTY_EARLY_CONSOLE + bool + default y if GOLDFISH_TTY=y + select SERIAL_EARLYCON + config DA_TTY bool "DA TTY" depends on METAG_DA Index: linux-4.14.15-rt12/drivers/tty/goldfish.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/tty/goldfish.c +++ linux-4.14.15-rt12/drivers/tty/goldfish.c @@ -442,6 +442,7 @@ static int goldfish_tty_remove(struct pl return 0; } +#ifdef CONFIG_GOLDFISH_TTY_EARLY_CONSOLE static void gf_early_console_putchar(struct uart_port *port, int ch) { __raw_writel(ch, port->membase); @@ -465,6 +466,7 @@ static int __init gf_earlycon_setup(stru } OF_EARLYCON_DECLARE(early_gf_tty, "google,goldfish-tty", gf_earlycon_setup); +#endif static const struct of_device_id goldfish_tty_of_match[] = { { .compatible = "google,goldfish-tty", }, Index: linux-4.14.15-rt12/drivers/tty/serial/8250/8250_core.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/tty/serial/8250/8250_core.c +++ linux-4.14.15-rt12/drivers/tty/serial/8250/8250_core.c @@ -58,7 +58,16 @@ static struct uart_driver serial8250_reg static unsigned int skip_txen_test; /* force skip of txen test at init time */ -#define PASS_LIMIT 512 +/* + * On -rt we can have a more delays, and legitimately + * so - so don't drop work spuriously and spam the + * syslog: + */ +#ifdef CONFIG_PREEMPT_RT_FULL +# define PASS_LIMIT 1000000 +#else +# define PASS_LIMIT 512 +#endif #include /* Index: linux-4.14.15-rt12/drivers/tty/serial/8250/8250_port.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/tty/serial/8250/8250_port.c +++ linux-4.14.15-rt12/drivers/tty/serial/8250/8250_port.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include #include @@ -3217,9 +3218,9 @@ void serial8250_console_write(struct uar serial8250_rpm_get(up); - if (port->sysrq) + if (port->sysrq || oops_in_progress) locked = 0; - else if (oops_in_progress) + else if (in_kdb_printk()) locked = spin_trylock_irqsave(&port->lock, flags); else spin_lock_irqsave(&port->lock, flags); Index: linux-4.14.15-rt12/drivers/tty/serial/amba-pl011.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/tty/serial/amba-pl011.c +++ linux-4.14.15-rt12/drivers/tty/serial/amba-pl011.c @@ -2220,13 +2220,19 @@ pl011_console_write(struct console *co, clk_enable(uap->clk); - local_irq_save(flags); + /* + * local_irq_save(flags); + * + * This local_irq_save() is nonsense. If we come in via sysrq + * handling then interrupts are already disabled. Aside of + * that the port.sysrq check is racy on SMP regardless. + */ if (uap->port.sysrq) locked = 0; else if (oops_in_progress) - locked = spin_trylock(&uap->port.lock); + locked = spin_trylock_irqsave(&uap->port.lock, flags); else - spin_lock(&uap->port.lock); + spin_lock_irqsave(&uap->port.lock, flags); /* * First save the CR then disable the interrupts @@ -2252,8 +2258,7 @@ pl011_console_write(struct console *co, pl011_write(old_cr, uap, REG_CR); if (locked) - spin_unlock(&uap->port.lock); - local_irq_restore(flags); + spin_unlock_irqrestore(&uap->port.lock, flags); clk_disable(uap->clk); } Index: linux-4.14.15-rt12/drivers/tty/serial/omap-serial.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/tty/serial/omap-serial.c +++ linux-4.14.15-rt12/drivers/tty/serial/omap-serial.c @@ -1311,13 +1311,10 @@ serial_omap_console_write(struct console pm_runtime_get_sync(up->dev); - local_irq_save(flags); - if (up->port.sysrq) - locked = 0; - else if (oops_in_progress) - locked = spin_trylock(&up->port.lock); + if (up->port.sysrq || oops_in_progress) + locked = spin_trylock_irqsave(&up->port.lock, flags); else - spin_lock(&up->port.lock); + spin_lock_irqsave(&up->port.lock, flags); /* * First save the IER then disable the interrupts @@ -1346,8 +1343,7 @@ serial_omap_console_write(struct console pm_runtime_mark_last_busy(up->dev); pm_runtime_put_autosuspend(up->dev); if (locked) - spin_unlock(&up->port.lock); - local_irq_restore(flags); + spin_unlock_irqrestore(&up->port.lock, flags); } static int __init Index: linux-4.14.15-rt12/drivers/usb/core/hcd.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/usb/core/hcd.c +++ linux-4.14.15-rt12/drivers/usb/core/hcd.c @@ -1775,9 +1775,9 @@ static void __usb_hcd_giveback_urb(struc * and no one may trigger the above deadlock situation when * running complete() in tasklet. */ - local_irq_save(flags); + local_irq_save_nort(flags); urb->complete(urb); - local_irq_restore(flags); + local_irq_restore_nort(flags); usb_anchor_resume_wakeups(anchor); atomic_dec(&urb->use_count); Index: linux-4.14.15-rt12/drivers/usb/gadget/function/f_fs.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/usb/gadget/function/f_fs.c +++ linux-4.14.15-rt12/drivers/usb/gadget/function/f_fs.c @@ -1609,7 +1609,7 @@ static void ffs_data_put(struct ffs_data pr_info("%s(): freeing\n", __func__); ffs_data_clear(ffs); BUG_ON(waitqueue_active(&ffs->ev.waitq) || - waitqueue_active(&ffs->ep0req_completion.wait) || + swait_active(&ffs->ep0req_completion.wait) || waitqueue_active(&ffs->wait)); destroy_workqueue(ffs->io_completion_wq); kfree(ffs->dev_name); Index: linux-4.14.15-rt12/drivers/usb/gadget/function/f_ncm.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/usb/gadget/function/f_ncm.c +++ linux-4.14.15-rt12/drivers/usb/gadget/function/f_ncm.c @@ -77,9 +77,7 @@ struct f_ncm { struct sk_buff *skb_tx_ndp; u16 ndp_dgram_count; bool timer_force_tx; - struct tasklet_struct tx_tasklet; struct hrtimer task_timer; - bool timer_stopping; }; @@ -1108,7 +1106,7 @@ static struct sk_buff *ncm_wrap_ntb(stru /* Delay the timer. */ hrtimer_start(&ncm->task_timer, TX_TIMEOUT_NSECS, - HRTIMER_MODE_REL); + HRTIMER_MODE_REL_SOFT); /* Add the datagram position entries */ ntb_ndp = skb_put_zero(ncm->skb_tx_ndp, dgram_idx_len); @@ -1152,17 +1150,15 @@ err: } /* - * This transmits the NTB if there are frames waiting. + * The transmit should only be run if no skb data has been sent + * for a certain duration. */ -static void ncm_tx_tasklet(unsigned long data) +static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data) { - struct f_ncm *ncm = (void *)data; - - if (ncm->timer_stopping) - return; + struct f_ncm *ncm = container_of(data, struct f_ncm, task_timer); /* Only send if data is available. */ - if (ncm->skb_tx_data) { + if (!ncm->timer_stopping && ncm->skb_tx_data) { ncm->timer_force_tx = true; /* XXX This allowance of a NULL skb argument to ndo_start_xmit @@ -1175,16 +1171,6 @@ static void ncm_tx_tasklet(unsigned long ncm->timer_force_tx = false; } -} - -/* - * The transmit should only be run if no skb data has been sent - * for a certain duration. - */ -static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data) -{ - struct f_ncm *ncm = container_of(data, struct f_ncm, task_timer); - tasklet_schedule(&ncm->tx_tasklet); return HRTIMER_NORESTART; } @@ -1517,8 +1503,7 @@ static int ncm_bind(struct usb_configura ncm->port.open = ncm_open; ncm->port.close = ncm_close; - tasklet_init(&ncm->tx_tasklet, ncm_tx_tasklet, (unsigned long) ncm); - hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT); ncm->task_timer.function = ncm_tx_timeout; DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n", @@ -1627,7 +1612,6 @@ static void ncm_unbind(struct usb_config DBG(c->cdev, "ncm unbind\n"); hrtimer_cancel(&ncm->task_timer); - tasklet_kill(&ncm->tx_tasklet); ncm_string_defs[0].id = 0; usb_free_all_descriptors(f); Index: linux-4.14.15-rt12/drivers/usb/gadget/legacy/inode.c =================================================================== --- linux-4.14.15-rt12.orig/drivers/usb/gadget/legacy/inode.c +++ linux-4.14.15-rt12/drivers/usb/gadget/legacy/inode.c @@ -347,7 +347,7 @@ ep_io (struct ep_data *epdata, void *buf spin_unlock_irq (&epdata->dev->lock); if (likely (value == 0)) { - value = wait_event_interruptible (done.wait, done.done); + value = swait_event_interruptible (done.wait, done.done); if (value != 0) { spin_lock_irq (&epdata->dev->lock); if (likely (epdata->ep != NULL)) { @@ -356,7 +356,7 @@ ep_io (struct ep_data *epdata, void *buf usb_ep_dequeue (epdata->ep, epdata->req); spin_unlock_irq (&epdata->dev->lock); - wait_event (done.wait, done.done); + swait_event (done.wait, done.done); if (epdata->status == -ECONNRESET) epdata->status = -EINTR; } else { Index: linux-4.14.15-rt12/fs/aio.c =================================================================== --- linux-4.14.15-rt12.orig/fs/aio.c +++ linux-4.14.15-rt12/fs/aio.c @@ -40,6 +40,7 @@ #include #include #include +#include #include #include @@ -115,7 +116,7 @@ struct kioctx { struct page **ring_pages; long nr_pages; - struct work_struct free_work; + struct swork_event free_work; /* * signals when all in-flight requests are done @@ -258,6 +259,7 @@ static int __init aio_setup(void) .mount = aio_mount, .kill_sb = kill_anon_super, }; + BUG_ON(swork_get()); aio_mnt = kern_mount(&aio_fs); if (IS_ERR(aio_mnt)) panic("Failed to create aio fs mount."); @@ -588,9 +590,9 @@ static int kiocb_cancel(struct aio_kiocb return cancel(&kiocb->common); } -static void free_ioctx(struct work_struct *work) +static void free_ioctx(struct swork_event *sev) { - struct kioctx *ctx = container_of(work, struct kioctx, free_work); + struct kioctx *ctx = container_of(sev, struct kioctx, free_work); pr_debug("freeing %p\n", ctx); @@ -609,8 +611,8 @@ static void free_ioctx_reqs(struct percp if (ctx->rq_wait && atomic_dec_and_test(&ctx->rq_wait->count)) complete(&ctx->rq_wait->comp); - INIT_WORK(&ctx->free_work, free_ioctx); - schedule_work(&ctx->free_work); + INIT_SWORK(&ctx->free_work, free_ioctx); + swork_queue(&ctx->free_work); } /* @@ -618,9 +620,9 @@ static void free_ioctx_reqs(struct percp * and ctx->users has dropped to 0, so we know no more kiocbs can be submitted - * now it's safe to cancel any that need to be. */ -static void free_ioctx_users(struct percpu_ref *ref) +static void free_ioctx_users_work(struct swork_event *sev) { - struct kioctx *ctx = container_of(ref, struct kioctx, users); + struct kioctx *ctx = container_of(sev, struct kioctx, free_work); struct aio_kiocb *req; spin_lock_irq(&ctx->ctx_lock); @@ -639,6 +641,14 @@ static void free_ioctx_users(struct perc percpu_ref_put(&ctx->reqs); } +static void free_ioctx_users(struct percpu_ref *ref) +{ + struct kioctx *ctx = container_of(ref, struct kioctx, users); + + INIT_SWORK(&ctx->free_work, free_ioctx_users_work); + swork_queue(&ctx->free_work); +} + static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm) { unsigned i, new_nr; Index: linux-4.14.15-rt12/fs/autofs4/autofs_i.h =================================================================== --- linux-4.14.15-rt12.orig/fs/autofs4/autofs_i.h +++ linux-4.14.15-rt12/fs/autofs4/autofs_i.h @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include Index: linux-4.14.15-rt12/fs/autofs4/expire.c =================================================================== --- linux-4.14.15-rt12.orig/fs/autofs4/expire.c +++ linux-4.14.15-rt12/fs/autofs4/expire.c @@ -148,7 +148,7 @@ again: parent = p->d_parent; if (!spin_trylock(&parent->d_lock)) { spin_unlock(&p->d_lock); - cpu_relax(); + cpu_chill(); goto relock; } spin_unlock(&p->d_lock); Index: linux-4.14.15-rt12/fs/buffer.c =================================================================== --- linux-4.14.15-rt12.orig/fs/buffer.c +++ linux-4.14.15-rt12/fs/buffer.c @@ -302,8 +302,7 @@ static void end_buffer_async_read(struct * decide that the page is now completely done. */ first = page_buffers(page); - local_irq_save(flags); - bit_spin_lock(BH_Uptodate_Lock, &first->b_state); + flags = bh_uptodate_lock_irqsave(first); clear_buffer_async_read(bh); unlock_buffer(bh); tmp = bh; @@ -316,8 +315,7 @@ static void end_buffer_async_read(struct } tmp = tmp->b_this_page; } while (tmp != bh); - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); + bh_uptodate_unlock_irqrestore(first, flags); /* * If none of the buffers had errors and they are all @@ -329,9 +327,7 @@ static void end_buffer_async_read(struct return; still_busy: - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); - return; + bh_uptodate_unlock_irqrestore(first, flags); } /* @@ -358,8 +354,7 @@ void end_buffer_async_write(struct buffe } first = page_buffers(page); - local_irq_save(flags); - bit_spin_lock(BH_Uptodate_Lock, &first->b_state); + flags = bh_uptodate_lock_irqsave(first); clear_buffer_async_write(bh); unlock_buffer(bh); @@ -371,15 +366,12 @@ void end_buffer_async_write(struct buffe } tmp = tmp->b_this_page; } - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); + bh_uptodate_unlock_irqrestore(first, flags); end_page_writeback(page); return; still_busy: - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); - return; + bh_uptodate_unlock_irqrestore(first, flags); } EXPORT_SYMBOL(end_buffer_async_write); @@ -3417,6 +3409,7 @@ struct buffer_head *alloc_buffer_head(gf struct buffer_head *ret = kmem_cache_zalloc(bh_cachep, gfp_flags); if (ret) { INIT_LIST_HEAD(&ret->b_assoc_buffers); + buffer_head_init_locks(ret); preempt_disable(); __this_cpu_inc(bh_accounting.nr); recalc_bh_state(); Index: linux-4.14.15-rt12/fs/cifs/readdir.c =================================================================== --- linux-4.14.15-rt12.orig/fs/cifs/readdir.c +++ linux-4.14.15-rt12/fs/cifs/readdir.c @@ -80,7 +80,7 @@ cifs_prime_dcache(struct dentry *parent, struct inode *inode; struct super_block *sb = parent->d_sb; struct cifs_sb_info *cifs_sb = CIFS_SB(sb); - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); + DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(wq); cifs_dbg(FYI, "%s: for %s\n", __func__, name->name); Index: linux-4.14.15-rt12/fs/dcache.c =================================================================== --- linux-4.14.15-rt12.orig/fs/dcache.c +++ linux-4.14.15-rt12/fs/dcache.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -784,6 +785,8 @@ static inline bool fast_dput(struct dent */ void dput(struct dentry *dentry) { + struct dentry *parent; + if (unlikely(!dentry)) return; @@ -820,9 +823,18 @@ repeat: return; kill_it: - dentry = dentry_kill(dentry); - if (dentry) { - cond_resched(); + parent = dentry_kill(dentry); + if (parent) { + int r; + + if (parent == dentry) { + /* the task with the highest priority won't schedule */ + r = cond_resched(); + if (!r) + cpu_chill(); + } else { + dentry = parent; + } goto repeat; } } @@ -2360,7 +2372,7 @@ again: if (dentry->d_lockref.count == 1) { if (!spin_trylock(&inode->i_lock)) { spin_unlock(&dentry->d_lock); - cpu_relax(); + cpu_chill(); goto again; } dentry->d_flags &= ~DCACHE_CANT_MOUNT; @@ -2405,9 +2417,10 @@ EXPORT_SYMBOL(d_rehash); static inline unsigned start_dir_add(struct inode *dir) { + preempt_disable_rt(); for (;;) { - unsigned n = dir->i_dir_seq; - if (!(n & 1) && cmpxchg(&dir->i_dir_seq, n, n + 1) == n) + unsigned n = dir->__i_dir_seq; + if (!(n & 1) && cmpxchg(&dir->__i_dir_seq, n, n + 1) == n) return n; cpu_relax(); } @@ -2415,26 +2428,30 @@ static inline unsigned start_dir_add(str static inline void end_dir_add(struct inode *dir, unsigned n) { - smp_store_release(&dir->i_dir_seq, n + 2); + smp_store_release(&dir->__i_dir_seq, n + 2); + preempt_enable_rt(); } static void d_wait_lookup(struct dentry *dentry) { - if (d_in_lookup(dentry)) { - DECLARE_WAITQUEUE(wait, current); - add_wait_queue(dentry->d_wait, &wait); - do { - set_current_state(TASK_UNINTERRUPTIBLE); - spin_unlock(&dentry->d_lock); - schedule(); - spin_lock(&dentry->d_lock); - } while (d_in_lookup(dentry)); - } + struct swait_queue __wait; + + if (!d_in_lookup(dentry)) + return; + + INIT_LIST_HEAD(&__wait.task_list); + do { + prepare_to_swait(dentry->d_wait, &__wait, TASK_UNINTERRUPTIBLE); + spin_unlock(&dentry->d_lock); + schedule(); + spin_lock(&dentry->d_lock); + } while (d_in_lookup(dentry)); + finish_swait(dentry->d_wait, &__wait); } struct dentry *d_alloc_parallel(struct dentry *parent, const struct qstr *name, - wait_queue_head_t *wq) + struct swait_queue_head *wq) { unsigned int hash = name->hash; struct hlist_bl_head *b = in_lookup_hash(parent, hash); @@ -2448,7 +2465,7 @@ struct dentry *d_alloc_parallel(struct d retry: rcu_read_lock(); - seq = smp_load_acquire(&parent->d_inode->i_dir_seq) & ~1; + seq = smp_load_acquire(&parent->d_inode->__i_dir_seq) & ~1; r_seq = read_seqbegin(&rename_lock); dentry = __d_lookup_rcu(parent, name, &d_seq); if (unlikely(dentry)) { @@ -2470,7 +2487,7 @@ retry: goto retry; } hlist_bl_lock(b); - if (unlikely(parent->d_inode->i_dir_seq != seq)) { + if (unlikely(parent->d_inode->__i_dir_seq != seq)) { hlist_bl_unlock(b); rcu_read_unlock(); goto retry; @@ -2543,7 +2560,7 @@ void __d_lookup_done(struct dentry *dent hlist_bl_lock(b); dentry->d_flags &= ~DCACHE_PAR_LOOKUP; __hlist_bl_del(&dentry->d_u.d_in_lookup_hash); - wake_up_all(dentry->d_wait); + swake_up_all(dentry->d_wait); dentry->d_wait = NULL; hlist_bl_unlock(b); INIT_HLIST_NODE(&dentry->d_u.d_alias); @@ -3576,6 +3593,8 @@ __setup("dhash_entries=", set_dhash_entr static void __init dcache_init_early(void) { + unsigned int loop; + /* If hashes are distributed across NUMA nodes, defer * hash allocation until vmalloc space is available. */ @@ -3592,10 +3611,14 @@ static void __init dcache_init_early(voi &d_hash_mask, 0, 0); + + for (loop = 0; loop < (1U << d_hash_shift); loop++) + INIT_HLIST_BL_HEAD(dentry_hashtable + loop); } static void __init dcache_init(void) { + unsigned int loop; /* * A constructor could be added for stable state like the lists, * but it is probably not worth it because of the cache nature @@ -3618,6 +3641,10 @@ static void __init dcache_init(void) &d_hash_mask, 0, 0); + + for (loop = 0; loop < (1U << d_hash_shift); loop++) + INIT_HLIST_BL_HEAD(dentry_hashtable + loop); + } /* SLAB cache for __getname() consumers */ Index: linux-4.14.15-rt12/fs/eventpoll.c =================================================================== --- linux-4.14.15-rt12.orig/fs/eventpoll.c +++ linux-4.14.15-rt12/fs/eventpoll.c @@ -587,12 +587,12 @@ static int ep_poll_wakeup_proc(void *pri */ static void ep_poll_safewake(wait_queue_head_t *wq) { - int this_cpu = get_cpu(); + int this_cpu = get_cpu_light(); ep_call_nested(&poll_safewake_ncalls, EP_MAX_NESTS, ep_poll_wakeup_proc, NULL, wq, (void *) (long) this_cpu); - put_cpu(); + put_cpu_light(); } static void ep_remove_wait_queue(struct eppoll_entry *pwq) Index: linux-4.14.15-rt12/fs/exec.c =================================================================== --- linux-4.14.15-rt12.orig/fs/exec.c +++ linux-4.14.15-rt12/fs/exec.c @@ -1024,12 +1024,14 @@ static int exec_mmap(struct mm_struct *m } } task_lock(tsk); + preempt_disable_rt(); active_mm = tsk->active_mm; tsk->mm = mm; tsk->active_mm = mm; activate_mm(active_mm, mm); tsk->mm->vmacache_seqnum = 0; vmacache_flush(tsk); + preempt_enable_rt(); task_unlock(tsk); if (old_mm) { up_read(&old_mm->mmap_sem); Index: linux-4.14.15-rt12/fs/ext4/page-io.c =================================================================== --- linux-4.14.15-rt12.orig/fs/ext4/page-io.c +++ linux-4.14.15-rt12/fs/ext4/page-io.c @@ -95,8 +95,7 @@ static void ext4_finish_bio(struct bio * * We check all buffers in the page under BH_Uptodate_Lock * to avoid races with other end io clearing async_write flags */ - local_irq_save(flags); - bit_spin_lock(BH_Uptodate_Lock, &head->b_state); + flags = bh_uptodate_lock_irqsave(head); do { if (bh_offset(bh) < bio_start || bh_offset(bh) + bh->b_size > bio_end) { @@ -108,8 +107,7 @@ static void ext4_finish_bio(struct bio * if (bio->bi_status) buffer_io_error(bh); } while ((bh = bh->b_this_page) != head); - bit_spin_unlock(BH_Uptodate_Lock, &head->b_state); - local_irq_restore(flags); + bh_uptodate_unlock_irqrestore(head, flags); if (!under_io) { #ifdef CONFIG_EXT4_FS_ENCRYPTION if (data_page) Index: linux-4.14.15-rt12/fs/fuse/dir.c =================================================================== --- linux-4.14.15-rt12.orig/fs/fuse/dir.c +++ linux-4.14.15-rt12/fs/fuse/dir.c @@ -1187,7 +1187,7 @@ static int fuse_direntplus_link(struct f struct inode *dir = d_inode(parent); struct fuse_conn *fc; struct inode *inode; - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); + DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(wq); if (!o->nodeid) { /* Index: linux-4.14.15-rt12/fs/inode.c =================================================================== --- linux-4.14.15-rt12.orig/fs/inode.c +++ linux-4.14.15-rt12/fs/inode.c @@ -154,7 +154,7 @@ int inode_init_always(struct super_block inode->i_bdev = NULL; inode->i_cdev = NULL; inode->i_link = NULL; - inode->i_dir_seq = 0; + inode->__i_dir_seq = 0; inode->i_rdev = 0; inode->dirtied_when = 0; Index: linux-4.14.15-rt12/fs/libfs.c =================================================================== --- linux-4.14.15-rt12.orig/fs/libfs.c +++ linux-4.14.15-rt12/fs/libfs.c @@ -90,7 +90,7 @@ static struct dentry *next_positive(stru struct list_head *from, int count) { - unsigned *seq = &parent->d_inode->i_dir_seq, n; + unsigned *seq = &parent->d_inode->__i_dir_seq, n; struct dentry *res; struct list_head *p; bool skipped; @@ -123,8 +123,9 @@ retry: static void move_cursor(struct dentry *cursor, struct list_head *after) { struct dentry *parent = cursor->d_parent; - unsigned n, *seq = &parent->d_inode->i_dir_seq; + unsigned n, *seq = &parent->d_inode->__i_dir_seq; spin_lock(&parent->d_lock); + preempt_disable_rt(); for (;;) { n = *seq; if (!(n & 1) && cmpxchg(seq, n, n + 1) == n) @@ -137,6 +138,7 @@ static void move_cursor(struct dentry *c else list_add_tail(&cursor->d_child, &parent->d_subdirs); smp_store_release(seq, n + 2); + preempt_enable_rt(); spin_unlock(&parent->d_lock); } Index: linux-4.14.15-rt12/fs/locks.c =================================================================== --- linux-4.14.15-rt12.orig/fs/locks.c +++ linux-4.14.15-rt12/fs/locks.c @@ -945,7 +945,7 @@ static int flock_lock_inode(struct inode return -ENOMEM; } - percpu_down_read_preempt_disable(&file_rwsem); + percpu_down_read(&file_rwsem); spin_lock(&ctx->flc_lock); if (request->fl_flags & FL_ACCESS) goto find_conflict; @@ -986,7 +986,7 @@ find_conflict: out: spin_unlock(&ctx->flc_lock); - percpu_up_read_preempt_enable(&file_rwsem); + percpu_up_read(&file_rwsem); if (new_fl) locks_free_lock(new_fl); locks_dispose_list(&dispose); @@ -1023,7 +1023,7 @@ static int posix_lock_inode(struct inode new_fl2 = locks_alloc_lock(); } - percpu_down_read_preempt_disable(&file_rwsem); + percpu_down_read(&file_rwsem); spin_lock(&ctx->flc_lock); /* * New lock request. Walk all POSIX locks and look for conflicts. If @@ -1195,7 +1195,7 @@ static int posix_lock_inode(struct inode } out: spin_unlock(&ctx->flc_lock); - percpu_up_read_preempt_enable(&file_rwsem); + percpu_up_read(&file_rwsem); /* * Free any unused locks. */ @@ -1470,7 +1470,7 @@ int __break_lease(struct inode *inode, u return error; } - percpu_down_read_preempt_disable(&file_rwsem); + percpu_down_read(&file_rwsem); spin_lock(&ctx->flc_lock); time_out_leases(inode, &dispose); @@ -1522,13 +1522,13 @@ restart: locks_insert_block(fl, new_fl); trace_break_lease_block(inode, new_fl); spin_unlock(&ctx->flc_lock); - percpu_up_read_preempt_enable(&file_rwsem); + percpu_up_read(&file_rwsem); locks_dispose_list(&dispose); error = wait_event_interruptible_timeout(new_fl->fl_wait, !new_fl->fl_next, break_time); - percpu_down_read_preempt_disable(&file_rwsem); + percpu_down_read(&file_rwsem); spin_lock(&ctx->flc_lock); trace_break_lease_unblock(inode, new_fl); locks_delete_block(new_fl); @@ -1545,7 +1545,7 @@ restart: } out: spin_unlock(&ctx->flc_lock); - percpu_up_read_preempt_enable(&file_rwsem); + percpu_up_read(&file_rwsem); locks_dispose_list(&dispose); locks_free_lock(new_fl); return error; @@ -1619,7 +1619,7 @@ int fcntl_getlease(struct file *filp) ctx = smp_load_acquire(&inode->i_flctx); if (ctx && !list_empty_careful(&ctx->flc_lease)) { - percpu_down_read_preempt_disable(&file_rwsem); + percpu_down_read(&file_rwsem); spin_lock(&ctx->flc_lock); time_out_leases(inode, &dispose); list_for_each_entry(fl, &ctx->flc_lease, fl_list) { @@ -1629,7 +1629,7 @@ int fcntl_getlease(struct file *filp) break; } spin_unlock(&ctx->flc_lock); - percpu_up_read_preempt_enable(&file_rwsem); + percpu_up_read(&file_rwsem); locks_dispose_list(&dispose); } @@ -1704,7 +1704,7 @@ generic_add_lease(struct file *filp, lon return -EINVAL; } - percpu_down_read_preempt_disable(&file_rwsem); + percpu_down_read(&file_rwsem); spin_lock(&ctx->flc_lock); time_out_leases(inode, &dispose); error = check_conflicting_open(dentry, arg, lease->fl_flags); @@ -1775,7 +1775,7 @@ out_setup: lease->fl_lmops->lm_setup(lease, priv); out: spin_unlock(&ctx->flc_lock); - percpu_up_read_preempt_enable(&file_rwsem); + percpu_up_read(&file_rwsem); locks_dispose_list(&dispose); if (is_deleg) inode_unlock(inode); @@ -1798,7 +1798,7 @@ static int generic_delete_lease(struct f return error; } - percpu_down_read_preempt_disable(&file_rwsem); + percpu_down_read(&file_rwsem); spin_lock(&ctx->flc_lock); list_for_each_entry(fl, &ctx->flc_lease, fl_list) { if (fl->fl_file == filp && @@ -1811,7 +1811,7 @@ static int generic_delete_lease(struct f if (victim) error = fl->fl_lmops->lm_change(victim, F_UNLCK, &dispose); spin_unlock(&ctx->flc_lock); - percpu_up_read_preempt_enable(&file_rwsem); + percpu_up_read(&file_rwsem); locks_dispose_list(&dispose); return error; } @@ -2535,13 +2535,13 @@ locks_remove_lease(struct file *filp, st if (list_empty(&ctx->flc_lease)) return; - percpu_down_read_preempt_disable(&file_rwsem); + percpu_down_read(&file_rwsem); spin_lock(&ctx->flc_lock); list_for_each_entry_safe(fl, tmp, &ctx->flc_lease, fl_list) if (filp == fl->fl_file) lease_modify(fl, F_UNLCK, &dispose); spin_unlock(&ctx->flc_lock); - percpu_up_read_preempt_enable(&file_rwsem); + percpu_up_read(&file_rwsem); locks_dispose_list(&dispose); } Index: linux-4.14.15-rt12/fs/namei.c =================================================================== --- linux-4.14.15-rt12.orig/fs/namei.c +++ linux-4.14.15-rt12/fs/namei.c @@ -1625,7 +1625,7 @@ static struct dentry *lookup_slow(const { struct dentry *dentry = ERR_PTR(-ENOENT), *old; struct inode *inode = dir->d_inode; - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); + DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(wq); inode_lock_shared(inode); /* Don't go there if it's already dead */ @@ -3098,7 +3098,7 @@ static int lookup_open(struct nameidata struct dentry *dentry; int error, create_error = 0; umode_t mode = op->mode; - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); + DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(wq); if (unlikely(IS_DEADDIR(dir_inode))) return -ENOENT; Index: linux-4.14.15-rt12/fs/namespace.c =================================================================== --- linux-4.14.15-rt12.orig/fs/namespace.c +++ linux-4.14.15-rt12/fs/namespace.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -353,8 +354,11 @@ int __mnt_want_write(struct vfsmount *m) * incremented count after it has set MNT_WRITE_HOLD. */ smp_mb(); - while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD) - cpu_relax(); + while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD) { + preempt_enable(); + cpu_chill(); + preempt_disable(); + } /* * After the slowpath clears MNT_WRITE_HOLD, mnt_is_readonly will * be set to match its requirements. So we must not load that until Index: linux-4.14.15-rt12/fs/nfs/delegation.c =================================================================== --- linux-4.14.15-rt12.orig/fs/nfs/delegation.c +++ linux-4.14.15-rt12/fs/nfs/delegation.c @@ -150,11 +150,11 @@ again: sp = state->owner; /* Block nfs4_proc_unlck */ mutex_lock(&sp->so_delegreturn_mutex); - seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); + seq = read_seqbegin(&sp->so_reclaim_seqlock); err = nfs4_open_delegation_recall(ctx, state, stateid, type); if (!err) err = nfs_delegation_claim_locks(ctx, state, stateid); - if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) + if (!err && read_seqretry(&sp->so_reclaim_seqlock, seq)) err = -EAGAIN; mutex_unlock(&sp->so_delegreturn_mutex); put_nfs_open_context(ctx); Index: linux-4.14.15-rt12/fs/nfs/dir.c =================================================================== --- linux-4.14.15-rt12.orig/fs/nfs/dir.c +++ linux-4.14.15-rt12/fs/nfs/dir.c @@ -452,7 +452,7 @@ static void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) { struct qstr filename = QSTR_INIT(entry->name, entry->len); - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); + DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(wq); struct dentry *dentry; struct dentry *alias; struct inode *dir = d_inode(parent); @@ -1443,7 +1443,7 @@ int nfs_atomic_open(struct inode *dir, s struct file *file, unsigned open_flags, umode_t mode, int *opened) { - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); + DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(wq); struct nfs_open_context *ctx; struct dentry *res; struct iattr attr = { .ia_valid = ATTR_OPEN }; @@ -1763,7 +1763,11 @@ int nfs_rmdir(struct inode *dir, struct trace_nfs_rmdir_enter(dir, dentry); if (d_really_is_positive(dentry)) { +#ifdef CONFIG_PREEMPT_RT_BASE + down(&NFS_I(d_inode(dentry))->rmdir_sem); +#else down_write(&NFS_I(d_inode(dentry))->rmdir_sem); +#endif error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); /* Ensure the VFS deletes this inode */ switch (error) { @@ -1773,7 +1777,11 @@ int nfs_rmdir(struct inode *dir, struct case -ENOENT: nfs_dentry_handle_enoent(dentry); } +#ifdef CONFIG_PREEMPT_RT_BASE + up(&NFS_I(d_inode(dentry))->rmdir_sem); +#else up_write(&NFS_I(d_inode(dentry))->rmdir_sem); +#endif } else error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); trace_nfs_rmdir_exit(dir, dentry, error); Index: linux-4.14.15-rt12/fs/nfs/inode.c =================================================================== --- linux-4.14.15-rt12.orig/fs/nfs/inode.c +++ linux-4.14.15-rt12/fs/nfs/inode.c @@ -2014,7 +2014,11 @@ static void init_once(void *foo) atomic_long_set(&nfsi->nrequests, 0); atomic_long_set(&nfsi->commit_info.ncommit, 0); atomic_set(&nfsi->commit_info.rpcs_out, 0); +#ifdef CONFIG_PREEMPT_RT_BASE + sema_init(&nfsi->rmdir_sem, 1); +#else init_rwsem(&nfsi->rmdir_sem); +#endif mutex_init(&nfsi->commit_mutex); nfs4_init_once(nfsi); } Index: linux-4.14.15-rt12/fs/nfs/nfs4_fs.h =================================================================== --- linux-4.14.15-rt12.orig/fs/nfs/nfs4_fs.h +++ linux-4.14.15-rt12/fs/nfs/nfs4_fs.h @@ -112,7 +112,7 @@ struct nfs4_state_owner { unsigned long so_flags; struct list_head so_states; struct nfs_seqid_counter so_seqid; - seqcount_t so_reclaim_seqcount; + seqlock_t so_reclaim_seqlock; struct mutex so_delegreturn_mutex; }; Index: linux-4.14.15-rt12/fs/nfs/nfs4proc.c =================================================================== --- linux-4.14.15-rt12.orig/fs/nfs/nfs4proc.c +++ linux-4.14.15-rt12/fs/nfs/nfs4proc.c @@ -2638,7 +2638,7 @@ static int _nfs4_open_and_get_state(stru unsigned int seq; int ret; - seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); + seq = raw_seqcount_begin(&sp->so_reclaim_seqlock.seqcount); ret = _nfs4_proc_open(opendata); if (ret != 0) @@ -2676,7 +2676,7 @@ static int _nfs4_open_and_get_state(stru if (d_inode(dentry) == state->inode) { nfs_inode_attach_open_context(ctx); - if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) + if (read_seqretry(&sp->so_reclaim_seqlock, seq)) nfs4_schedule_stateid_recovery(server, state); } out: Index: linux-4.14.15-rt12/fs/nfs/nfs4state.c =================================================================== --- linux-4.14.15-rt12.orig/fs/nfs/nfs4state.c +++ linux-4.14.15-rt12/fs/nfs/nfs4state.c @@ -494,7 +494,7 @@ nfs4_alloc_state_owner(struct nfs_server nfs4_init_seqid_counter(&sp->so_seqid); atomic_set(&sp->so_count, 1); INIT_LIST_HEAD(&sp->so_lru); - seqcount_init(&sp->so_reclaim_seqcount); + seqlock_init(&sp->so_reclaim_seqlock); mutex_init(&sp->so_delegreturn_mutex); return sp; } @@ -1516,8 +1516,12 @@ static int nfs4_reclaim_open_state(struc * recovering after a network partition or a reboot from a * server that doesn't support a grace period. */ +#ifdef CONFIG_PREEMPT_RT_FULL + write_seqlock(&sp->so_reclaim_seqlock); +#else + write_seqcount_begin(&sp->so_reclaim_seqlock.seqcount); +#endif spin_lock(&sp->so_lock); - raw_write_seqcount_begin(&sp->so_reclaim_seqcount); restart: list_for_each_entry(state, &sp->so_states, open_states) { if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) @@ -1586,14 +1590,20 @@ restart: spin_lock(&sp->so_lock); goto restart; } - raw_write_seqcount_end(&sp->so_reclaim_seqcount); spin_unlock(&sp->so_lock); +#ifdef CONFIG_PREEMPT_RT_FULL + write_sequnlock(&sp->so_reclaim_seqlock); +#else + write_seqcount_end(&sp->so_reclaim_seqlock.seqcount); +#endif return 0; out_err: nfs4_put_open_state(state); - spin_lock(&sp->so_lock); - raw_write_seqcount_end(&sp->so_reclaim_seqcount); - spin_unlock(&sp->so_lock); +#ifdef CONFIG_PREEMPT_RT_FULL + write_sequnlock(&sp->so_reclaim_seqlock); +#else + write_seqcount_end(&sp->so_reclaim_seqlock.seqcount); +#endif return status; } Index: linux-4.14.15-rt12/fs/nfs/unlink.c =================================================================== --- linux-4.14.15-rt12.orig/fs/nfs/unlink.c +++ linux-4.14.15-rt12/fs/nfs/unlink.c @@ -13,7 +13,7 @@ #include #include #include -#include +#include #include #include @@ -52,6 +52,29 @@ static void nfs_async_unlink_done(struct rpc_restart_call_prepare(task); } +#ifdef CONFIG_PREEMPT_RT_BASE +static void nfs_down_anon(struct semaphore *sema) +{ + down(sema); +} + +static void nfs_up_anon(struct semaphore *sema) +{ + up(sema); +} + +#else +static void nfs_down_anon(struct rw_semaphore *rwsem) +{ + down_read_non_owner(rwsem); +} + +static void nfs_up_anon(struct rw_semaphore *rwsem) +{ + up_read_non_owner(rwsem); +} +#endif + /** * nfs_async_unlink_release - Release the sillydelete data. * @task: rpc_task of the sillydelete @@ -65,7 +88,7 @@ static void nfs_async_unlink_release(voi struct dentry *dentry = data->dentry; struct super_block *sb = dentry->d_sb; - up_read_non_owner(&NFS_I(d_inode(dentry->d_parent))->rmdir_sem); + nfs_up_anon(&NFS_I(d_inode(dentry->d_parent))->rmdir_sem); d_lookup_done(dentry); nfs_free_unlinkdata(data); dput(dentry); @@ -118,10 +141,10 @@ static int nfs_call_unlink(struct dentry struct inode *dir = d_inode(dentry->d_parent); struct dentry *alias; - down_read_non_owner(&NFS_I(dir)->rmdir_sem); + nfs_down_anon(&NFS_I(dir)->rmdir_sem); alias = d_alloc_parallel(dentry->d_parent, &data->args.name, &data->wq); if (IS_ERR(alias)) { - up_read_non_owner(&NFS_I(dir)->rmdir_sem); + nfs_up_anon(&NFS_I(dir)->rmdir_sem); return 0; } if (!d_in_lookup(alias)) { @@ -143,7 +166,7 @@ static int nfs_call_unlink(struct dentry ret = 0; spin_unlock(&alias->d_lock); dput(alias); - up_read_non_owner(&NFS_I(dir)->rmdir_sem); + nfs_up_anon(&NFS_I(dir)->rmdir_sem); /* * If we'd displaced old cached devname, free it. At that * point dentry is definitely not a root, so we won't need @@ -183,7 +206,7 @@ nfs_async_unlink(struct dentry *dentry, goto out_free_name; } data->res.dir_attr = &data->dir_attr; - init_waitqueue_head(&data->wq); + init_swait_queue_head(&data->wq); status = -EBUSY; spin_lock(&dentry->d_lock); Index: linux-4.14.15-rt12/fs/ntfs/aops.c =================================================================== --- linux-4.14.15-rt12.orig/fs/ntfs/aops.c +++ linux-4.14.15-rt12/fs/ntfs/aops.c @@ -93,13 +93,13 @@ static void ntfs_end_buffer_async_read(s ofs = 0; if (file_ofs < init_size) ofs = init_size - file_ofs; - local_irq_save(flags); + local_irq_save_nort(flags); kaddr = kmap_atomic(page); memset(kaddr + bh_offset(bh) + ofs, 0, bh->b_size - ofs); flush_dcache_page(page); kunmap_atomic(kaddr); - local_irq_restore(flags); + local_irq_restore_nort(flags); } } else { clear_buffer_uptodate(bh); @@ -108,8 +108,7 @@ static void ntfs_end_buffer_async_read(s "0x%llx.", (unsigned long long)bh->b_blocknr); } first = page_buffers(page); - local_irq_save(flags); - bit_spin_lock(BH_Uptodate_Lock, &first->b_state); + flags = bh_uptodate_lock_irqsave(first); clear_buffer_async_read(bh); unlock_buffer(bh); tmp = bh; @@ -124,8 +123,7 @@ static void ntfs_end_buffer_async_read(s } tmp = tmp->b_this_page; } while (tmp != bh); - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); + bh_uptodate_unlock_irqrestore(first, flags); /* * If none of the buffers had errors then we can set the page uptodate, * but we first have to perform the post read mst fixups, if the @@ -146,13 +144,13 @@ static void ntfs_end_buffer_async_read(s recs = PAGE_SIZE / rec_size; /* Should have been verified before we got here... */ BUG_ON(!recs); - local_irq_save(flags); + local_irq_save_nort(flags); kaddr = kmap_atomic(page); for (i = 0; i < recs; i++) post_read_mst_fixup((NTFS_RECORD*)(kaddr + i * rec_size), rec_size); kunmap_atomic(kaddr); - local_irq_restore(flags); + local_irq_restore_nort(flags); flush_dcache_page(page); if (likely(page_uptodate && !PageError(page))) SetPageUptodate(page); @@ -160,9 +158,7 @@ static void ntfs_end_buffer_async_read(s unlock_page(page); return; still_busy: - bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); - local_irq_restore(flags); - return; + bh_uptodate_unlock_irqrestore(first, flags); } /** Index: linux-4.14.15-rt12/fs/proc/array.c =================================================================== --- linux-4.14.15-rt12.orig/fs/proc/array.c +++ linux-4.14.15-rt12/fs/proc/array.c @@ -361,9 +361,9 @@ static inline void task_context_switch_c static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) { seq_printf(m, "Cpus_allowed:\t%*pb\n", - cpumask_pr_args(&task->cpus_allowed)); + cpumask_pr_args(task->cpus_ptr)); seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", - cpumask_pr_args(&task->cpus_allowed)); + cpumask_pr_args(task->cpus_ptr)); } int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, Index: linux-4.14.15-rt12/fs/proc/base.c =================================================================== --- linux-4.14.15-rt12.orig/fs/proc/base.c +++ linux-4.14.15-rt12/fs/proc/base.c @@ -1878,7 +1878,7 @@ bool proc_fill_cache(struct file *file, child = d_hash_and_lookup(dir, &qname); if (!child) { - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); + DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(wq); child = d_alloc_parallel(dir, &qname, &wq); if (IS_ERR(child)) goto end_instantiate; Index: linux-4.14.15-rt12/fs/proc/proc_sysctl.c =================================================================== --- linux-4.14.15-rt12.orig/fs/proc/proc_sysctl.c +++ linux-4.14.15-rt12/fs/proc/proc_sysctl.c @@ -679,7 +679,7 @@ static bool proc_sys_fill_cache(struct f child = d_lookup(dir, &qname); if (!child) { - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); + DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(wq); child = d_alloc_parallel(dir, &qname, &wq); if (IS_ERR(child)) return false; Index: linux-4.14.15-rt12/fs/timerfd.c =================================================================== --- linux-4.14.15-rt12.orig/fs/timerfd.c +++ linux-4.14.15-rt12/fs/timerfd.c @@ -471,7 +471,10 @@ static int do_timerfd_settime(int ufd, i break; } spin_unlock_irq(&ctx->wqh.lock); - cpu_relax(); + if (isalarm(ctx)) + hrtimer_wait_for_timer(&ctx->t.alarm.timer); + else + hrtimer_wait_for_timer(&ctx->t.tmr); } /* Index: linux-4.14.15-rt12/fs/xfs/xfs_aops.c =================================================================== --- linux-4.14.15-rt12.orig/fs/xfs/xfs_aops.c +++ linux-4.14.15-rt12/fs/xfs/xfs_aops.c @@ -120,8 +120,7 @@ xfs_finish_page_writeback( ASSERT(bvec->bv_offset + bvec->bv_len <= PAGE_SIZE); ASSERT((bvec->bv_len & (i_blocksize(inode) - 1)) == 0); - local_irq_save(flags); - bit_spin_lock(BH_Uptodate_Lock, &head->b_state); + flags = bh_uptodate_lock_irqsave(head); do { if (off >= bvec->bv_offset && off < bvec->bv_offset + bvec->bv_len) { @@ -143,8 +142,7 @@ xfs_finish_page_writeback( } off += bh->b_size; } while ((bh = bh->b_this_page) != head); - bit_spin_unlock(BH_Uptodate_Lock, &head->b_state); - local_irq_restore(flags); + bh_uptodate_unlock_irqrestore(head, flags); if (!busy) end_page_writeback(bvec->bv_page); Index: linux-4.14.15-rt12/include/acpi/platform/aclinux.h =================================================================== --- linux-4.14.15-rt12.orig/include/acpi/platform/aclinux.h +++ linux-4.14.15-rt12/include/acpi/platform/aclinux.h @@ -134,6 +134,7 @@ #define acpi_cache_t struct kmem_cache #define acpi_spinlock spinlock_t * +#define acpi_raw_spinlock raw_spinlock_t * #define acpi_cpu_flags unsigned long /* Use native linux version of acpi_os_allocate_zeroed */ @@ -152,6 +153,20 @@ #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_thread_id #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_create_lock +#define acpi_os_create_raw_lock(__handle) \ +({ \ + raw_spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \ + \ + if (lock) { \ + *(__handle) = lock; \ + raw_spin_lock_init(*(__handle)); \ + } \ + lock ? AE_OK : AE_NO_MEMORY; \ + }) + +#define acpi_os_delete_raw_lock(__handle) kfree(__handle) + + /* * OSL interfaces used by debugger/disassembler */ Index: linux-4.14.15-rt12/include/asm-generic/bug.h =================================================================== --- linux-4.14.15-rt12.orig/include/asm-generic/bug.h +++ linux-4.14.15-rt12/include/asm-generic/bug.h @@ -233,6 +233,20 @@ void __warn(const char *file, int line, # define WARN_ON_SMP(x) ({0;}) #endif +#ifdef CONFIG_PREEMPT_RT_BASE +# define BUG_ON_RT(c) BUG_ON(c) +# define BUG_ON_NONRT(c) do { } while (0) +# define WARN_ON_RT(condition) WARN_ON(condition) +# define WARN_ON_NONRT(condition) do { } while (0) +# define WARN_ON_ONCE_NONRT(condition) do { } while (0) +#else +# define BUG_ON_RT(c) do { } while (0) +# define BUG_ON_NONRT(c) BUG_ON(c) +# define WARN_ON_RT(condition) do { } while (0) +# define WARN_ON_NONRT(condition) WARN_ON(condition) +# define WARN_ON_ONCE_NONRT(condition) WARN_ON_ONCE(condition) +#endif + #endif /* __ASSEMBLY__ */ #endif Index: linux-4.14.15-rt12/include/linux/blk-mq.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/blk-mq.h +++ linux-4.14.15-rt12/include/linux/blk-mq.h @@ -226,7 +226,7 @@ static inline u16 blk_mq_unique_tag_to_t return unique_tag & BLK_MQ_UNIQUE_TAG_MASK; } - +void __blk_mq_complete_request_remote_work(struct work_struct *work); int blk_mq_request_started(struct request *rq); void blk_mq_start_request(struct request *rq); void blk_mq_end_request(struct request *rq, blk_status_t error); Index: linux-4.14.15-rt12/include/linux/blkdev.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/blkdev.h +++ linux-4.14.15-rt12/include/linux/blkdev.h @@ -27,6 +27,7 @@ #include #include #include +#include struct module; struct scsi_ioctl_command; @@ -134,6 +135,9 @@ typedef __u32 __bitwise req_flags_t; */ struct request { struct list_head queuelist; +#ifdef CONFIG_PREEMPT_RT_FULL + struct work_struct work; +#endif union { struct __call_single_data csd; u64 fifo_time; @@ -596,6 +600,7 @@ struct request_queue { #endif struct rcu_head rcu_head; wait_queue_head_t mq_freeze_wq; + struct swork_event mq_pcpu_wake; struct percpu_ref q_usage_counter; struct list_head all_q_node; Index: linux-4.14.15-rt12/include/linux/bottom_half.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/bottom_half.h +++ linux-4.14.15-rt12/include/linux/bottom_half.h @@ -4,6 +4,39 @@ #include +#ifdef CONFIG_PREEMPT_RT_FULL + +extern void __local_bh_disable(void); +extern void _local_bh_enable(void); +extern void __local_bh_enable(void); + +static inline void local_bh_disable(void) +{ + __local_bh_disable(); +} + +static inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt) +{ + __local_bh_disable(); +} + +static inline void local_bh_enable(void) +{ + __local_bh_enable(); +} + +static inline void __local_bh_enable_ip(unsigned long ip, unsigned int cnt) +{ + __local_bh_enable(); +} + +static inline void local_bh_enable_ip(unsigned long ip) +{ + __local_bh_enable(); +} + +#else + #ifdef CONFIG_TRACE_IRQFLAGS extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt); #else @@ -31,5 +64,6 @@ static inline void local_bh_enable(void) { __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET); } +#endif #endif /* _LINUX_BH_H */ Index: linux-4.14.15-rt12/include/linux/buffer_head.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/buffer_head.h +++ linux-4.14.15-rt12/include/linux/buffer_head.h @@ -76,8 +76,50 @@ struct buffer_head { struct address_space *b_assoc_map; /* mapping this buffer is associated with */ atomic_t b_count; /* users using this buffer_head */ +#ifdef CONFIG_PREEMPT_RT_BASE + spinlock_t b_uptodate_lock; +#if IS_ENABLED(CONFIG_JBD2) + spinlock_t b_state_lock; + spinlock_t b_journal_head_lock; +#endif +#endif }; +static inline unsigned long bh_uptodate_lock_irqsave(struct buffer_head *bh) +{ + unsigned long flags; + +#ifndef CONFIG_PREEMPT_RT_BASE + local_irq_save(flags); + bit_spin_lock(BH_Uptodate_Lock, &bh->b_state); +#else + spin_lock_irqsave(&bh->b_uptodate_lock, flags); +#endif + return flags; +} + +static inline void +bh_uptodate_unlock_irqrestore(struct buffer_head *bh, unsigned long flags) +{ +#ifndef CONFIG_PREEMPT_RT_BASE + bit_spin_unlock(BH_Uptodate_Lock, &bh->b_state); + local_irq_restore(flags); +#else + spin_unlock_irqrestore(&bh->b_uptodate_lock, flags); +#endif +} + +static inline void buffer_head_init_locks(struct buffer_head *bh) +{ +#ifdef CONFIG_PREEMPT_RT_BASE + spin_lock_init(&bh->b_uptodate_lock); +#if IS_ENABLED(CONFIG_JBD2) + spin_lock_init(&bh->b_state_lock); + spin_lock_init(&bh->b_journal_head_lock); +#endif +#endif +} + /* * macro tricks to expand the set_buffer_foo(), clear_buffer_foo() * and buffer_foo() functions. Index: linux-4.14.15-rt12/include/linux/cgroup-defs.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/cgroup-defs.h +++ linux-4.14.15-rt12/include/linux/cgroup-defs.h @@ -19,6 +19,7 @@ #include #include #include +#include #ifdef CONFIG_CGROUPS @@ -152,6 +153,7 @@ struct cgroup_subsys_state { /* percpu_ref killing and RCU release */ struct rcu_head rcu_head; struct work_struct destroy_work; + struct swork_event destroy_swork; /* * PI: the parent css. Placed here for cache proximity to following Index: linux-4.14.15-rt12/include/linux/completion.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/completion.h +++ linux-4.14.15-rt12/include/linux/completion.h @@ -9,7 +9,7 @@ * See kernel/sched/completion.c for details. */ -#include +#include #ifdef CONFIG_LOCKDEP_COMPLETIONS #include #endif @@ -28,7 +28,7 @@ */ struct completion { unsigned int done; - wait_queue_head_t wait; + struct swait_queue_head wait; #ifdef CONFIG_LOCKDEP_COMPLETIONS struct lockdep_map_cross map; #endif @@ -67,11 +67,11 @@ static inline void complete_release_comm #ifdef CONFIG_LOCKDEP_COMPLETIONS #define COMPLETION_INITIALIZER(work) \ - { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait), \ + { 0, __SWAIT_QUEUE_HEAD_INITIALIZER((work).wait), \ STATIC_CROSS_LOCKDEP_MAP_INIT("(complete)" #work, &(work)) } #else #define COMPLETION_INITIALIZER(work) \ - { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) } + { 0, __SWAIT_QUEUE_HEAD_INITIALIZER((work).wait) } #endif #define COMPLETION_INITIALIZER_ONSTACK(work) \ @@ -117,7 +117,7 @@ static inline void complete_release_comm static inline void __init_completion(struct completion *x) { x->done = 0; - init_waitqueue_head(&x->wait); + init_swait_queue_head(&x->wait); } /** Index: linux-4.14.15-rt12/include/linux/cpu.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/cpu.h +++ linux-4.14.15-rt12/include/linux/cpu.h @@ -116,6 +116,8 @@ extern void cpu_hotplug_disable(void); extern void cpu_hotplug_enable(void); void clear_tasks_mm_cpumask(int cpu); int cpu_down(unsigned int cpu); +extern void pin_current_cpu(void); +extern void unpin_current_cpu(void); #else /* CONFIG_HOTPLUG_CPU */ @@ -126,6 +128,9 @@ static inline void cpus_read_unlock(void static inline void lockdep_assert_cpus_held(void) { } static inline void cpu_hotplug_disable(void) { } static inline void cpu_hotplug_enable(void) { } +static inline void pin_current_cpu(void) { } +static inline void unpin_current_cpu(void) { } + #endif /* !CONFIG_HOTPLUG_CPU */ /* Wrappers which go away once all code is converted */ Index: linux-4.14.15-rt12/include/linux/dcache.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/dcache.h +++ linux-4.14.15-rt12/include/linux/dcache.h @@ -107,7 +107,7 @@ struct dentry { union { struct list_head d_lru; /* LRU list */ - wait_queue_head_t *d_wait; /* in-lookup ones only */ + struct swait_queue_head *d_wait; /* in-lookup ones only */ }; struct list_head d_child; /* child of parent list */ struct list_head d_subdirs; /* our children */ @@ -237,7 +237,7 @@ extern void d_set_d_op(struct dentry *de extern struct dentry * d_alloc(struct dentry *, const struct qstr *); extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *); extern struct dentry * d_alloc_parallel(struct dentry *, const struct qstr *, - wait_queue_head_t *); + struct swait_queue_head *); extern struct dentry * d_splice_alias(struct inode *, struct dentry *); extern struct dentry * d_add_ci(struct dentry *, struct inode *, struct qstr *); extern struct dentry * d_exact_alias(struct dentry *, struct inode *); Index: linux-4.14.15-rt12/include/linux/delay.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/delay.h +++ linux-4.14.15-rt12/include/linux/delay.h @@ -64,4 +64,10 @@ static inline void ssleep(unsigned int s msleep(seconds * 1000); } +#ifdef CONFIG_PREEMPT_RT_FULL +extern void cpu_chill(void); +#else +# define cpu_chill() cpu_relax() +#endif + #endif /* defined(_LINUX_DELAY_H) */ Index: linux-4.14.15-rt12/include/linux/delayacct.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/delayacct.h +++ linux-4.14.15-rt12/include/linux/delayacct.h @@ -29,7 +29,7 @@ #ifdef CONFIG_TASK_DELAY_ACCT struct task_delay_info { - spinlock_t lock; + raw_spinlock_t lock; unsigned int flags; /* Private per-task flags */ /* For each stat XXX, add following, aligned appropriately Index: linux-4.14.15-rt12/include/linux/fs.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/fs.h +++ linux-4.14.15-rt12/include/linux/fs.h @@ -655,7 +655,7 @@ struct inode { struct block_device *i_bdev; struct cdev *i_cdev; char *i_link; - unsigned i_dir_seq; + unsigned __i_dir_seq; }; __u32 i_generation; Index: linux-4.14.15-rt12/include/linux/highmem.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/highmem.h +++ linux-4.14.15-rt12/include/linux/highmem.h @@ -8,6 +8,7 @@ #include #include #include +#include #include @@ -66,7 +67,7 @@ static inline void kunmap(struct page *p static inline void *kmap_atomic(struct page *page) { - preempt_disable(); + preempt_disable_nort(); pagefault_disable(); return page_address(page); } @@ -75,7 +76,7 @@ static inline void *kmap_atomic(struct p static inline void __kunmap_atomic(void *addr) { pagefault_enable(); - preempt_enable(); + preempt_enable_nort(); } #define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) @@ -87,32 +88,51 @@ static inline void __kunmap_atomic(void #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) +#ifndef CONFIG_PREEMPT_RT_FULL DECLARE_PER_CPU(int, __kmap_atomic_idx); +#endif static inline int kmap_atomic_idx_push(void) { +#ifndef CONFIG_PREEMPT_RT_FULL int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; -#ifdef CONFIG_DEBUG_HIGHMEM +# ifdef CONFIG_DEBUG_HIGHMEM WARN_ON_ONCE(in_irq() && !irqs_disabled()); BUG_ON(idx >= KM_TYPE_NR); -#endif +# endif return idx; +#else + current->kmap_idx++; + BUG_ON(current->kmap_idx > KM_TYPE_NR); + return current->kmap_idx - 1; +#endif } static inline int kmap_atomic_idx(void) { +#ifndef CONFIG_PREEMPT_RT_FULL return __this_cpu_read(__kmap_atomic_idx) - 1; +#else + return current->kmap_idx - 1; +#endif } static inline void kmap_atomic_idx_pop(void) { -#ifdef CONFIG_DEBUG_HIGHMEM +#ifndef CONFIG_PREEMPT_RT_FULL +# ifdef CONFIG_DEBUG_HIGHMEM int idx = __this_cpu_dec_return(__kmap_atomic_idx); BUG_ON(idx < 0); -#else +# else __this_cpu_dec(__kmap_atomic_idx); +# endif +#else + current->kmap_idx--; +# ifdef CONFIG_DEBUG_HIGHMEM + BUG_ON(current->kmap_idx < 0); +# endif #endif } Index: linux-4.14.15-rt12/include/linux/hrtimer.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/hrtimer.h +++ linux-4.14.15-rt12/include/linux/hrtimer.h @@ -22,19 +22,42 @@ #include #include #include +#include struct hrtimer_clock_base; struct hrtimer_cpu_base; /* * Mode arguments of xxx_hrtimer functions: + * + * HRTIMER_MODE_ABS - Time value is absolute + * HRTIMER_MODE_REL - Time value is relative to now + * HRTIMER_MODE_PINNED - Timer is bound to CPU (is only considered + * when starting the timer) + * HRTIMER_MODE_SOFT - Timer callback function will be executed in + * soft irq context */ enum hrtimer_mode { - HRTIMER_MODE_ABS = 0x0, /* Time value is absolute */ - HRTIMER_MODE_REL = 0x1, /* Time value is relative to now */ - HRTIMER_MODE_PINNED = 0x02, /* Timer is bound to CPU */ - HRTIMER_MODE_ABS_PINNED = 0x02, - HRTIMER_MODE_REL_PINNED = 0x03, + HRTIMER_MODE_ABS = 0x00, + HRTIMER_MODE_REL = 0x01, + HRTIMER_MODE_PINNED = 0x02, + HRTIMER_MODE_SOFT = 0x04, + HRTIMER_MODE_HARD = 0x08, + + HRTIMER_MODE_ABS_PINNED = HRTIMER_MODE_ABS | HRTIMER_MODE_PINNED, + HRTIMER_MODE_REL_PINNED = HRTIMER_MODE_REL | HRTIMER_MODE_PINNED, + + HRTIMER_MODE_ABS_SOFT = HRTIMER_MODE_ABS | HRTIMER_MODE_SOFT, + HRTIMER_MODE_REL_SOFT = HRTIMER_MODE_REL | HRTIMER_MODE_SOFT, + + HRTIMER_MODE_ABS_PINNED_SOFT = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_SOFT, + HRTIMER_MODE_REL_PINNED_SOFT = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_SOFT, + + HRTIMER_MODE_ABS_HARD = HRTIMER_MODE_ABS | HRTIMER_MODE_HARD, + HRTIMER_MODE_REL_HARD = HRTIMER_MODE_REL | HRTIMER_MODE_HARD, + + HRTIMER_MODE_ABS_PINNED_HARD = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_HARD, + HRTIMER_MODE_REL_PINNED_HARD = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_HARD, }; /* @@ -87,6 +110,7 @@ enum hrtimer_restart { * @base: pointer to the timer base (per cpu and per clock) * @state: state information (See bit values above) * @is_rel: Set if the timer was armed relative + * @is_soft: Set if hrtimer will be expired in soft interrupt context. * * The hrtimer structure must be initialized by hrtimer_init() */ @@ -97,6 +121,7 @@ struct hrtimer { struct hrtimer_clock_base *base; u8 state; u8 is_rel; + u8 is_soft; }; /** @@ -112,9 +137,9 @@ struct hrtimer_sleeper { }; #ifdef CONFIG_64BIT -# define HRTIMER_CLOCK_BASE_ALIGN 64 +# define __hrtimer_clock_base_align ____cacheline_aligned #else -# define HRTIMER_CLOCK_BASE_ALIGN 32 +# define __hrtimer_clock_base_align #endif /** @@ -123,48 +148,57 @@ struct hrtimer_sleeper { * @index: clock type index for per_cpu support when moving a * timer to a base on another cpu. * @clockid: clock id for per_cpu support + * @seq: seqcount around __run_hrtimer + * @running: pointer to the currently running hrtimer * @active: red black tree root node for the active timers * @get_time: function to retrieve the current time of the clock * @offset: offset of this clock to the monotonic base */ struct hrtimer_clock_base { struct hrtimer_cpu_base *cpu_base; - int index; + unsigned int index; clockid_t clockid; + seqcount_t seq; + struct hrtimer *running; struct timerqueue_head active; ktime_t (*get_time)(void); ktime_t offset; -} __attribute__((__aligned__(HRTIMER_CLOCK_BASE_ALIGN))); +} __hrtimer_clock_base_align; enum hrtimer_base_type { HRTIMER_BASE_MONOTONIC, HRTIMER_BASE_REALTIME, HRTIMER_BASE_BOOTTIME, HRTIMER_BASE_TAI, + HRTIMER_BASE_MONOTONIC_SOFT, + HRTIMER_BASE_REALTIME_SOFT, + HRTIMER_BASE_BOOTTIME_SOFT, + HRTIMER_BASE_TAI_SOFT, HRTIMER_MAX_CLOCK_BASES, }; -/* +/** * struct hrtimer_cpu_base - the per cpu clock bases * @lock: lock protecting the base and associated clock bases * and timers - * @seq: seqcount around __run_hrtimer - * @running: pointer to the currently running hrtimer * @cpu: cpu number * @active_bases: Bitfield to mark bases with active timers * @clock_was_set_seq: Sequence counter of clock was set events - * @migration_enabled: The migration of hrtimers to other cpus is enabled - * @nohz_active: The nohz functionality is enabled - * @expires_next: absolute time of the next event which was scheduled - * via clock_set_next_event() - * @next_timer: Pointer to the first expiring timer - * @in_hrtirq: hrtimer_interrupt() is currently executing * @hres_active: State of high resolution mode + * @in_hrtirq: hrtimer_interrupt() is currently executing * @hang_detected: The last hrtimer interrupt detected a hang + * @softirq_activated: displays, if the softirq is raised - update of softirq + * related settings is not required then. * @nr_events: Total number of hrtimer interrupt events * @nr_retries: Total number of hrtimer interrupt retries * @nr_hangs: Total number of hrtimer interrupt hangs * @max_hang_time: Maximum time spent in hrtimer_interrupt + * @expires_next: absolute time of the next event, is required for remote + * hrtimer enqueue; it is the total first expiry time (hard + * and soft hrtimer are taken into account) + * @next_timer: Pointer to the first expiring timer + * @softirq_expires_next: Time to check, if soft queues needs also to be expired + * @softirq_next_timer: Pointer to the first expiring softirq based timer * @clock_base: array of clock bases for this cpu * * Note: next_timer is just an optimization for __remove_hrtimer(). @@ -173,31 +207,31 @@ enum hrtimer_base_type { */ struct hrtimer_cpu_base { raw_spinlock_t lock; - seqcount_t seq; - struct hrtimer *running; unsigned int cpu; unsigned int active_bases; unsigned int clock_was_set_seq; - bool migration_enabled; - bool nohz_active; + unsigned int hres_active : 1, + in_hrtirq : 1, + hang_detected : 1, + softirq_activated : 1; #ifdef CONFIG_HIGH_RES_TIMERS - unsigned int in_hrtirq : 1, - hres_active : 1, - hang_detected : 1; - ktime_t expires_next; - struct hrtimer *next_timer; unsigned int nr_events; - unsigned int nr_retries; - unsigned int nr_hangs; + unsigned short nr_retries; + unsigned short nr_hangs; unsigned int max_hang_time; #endif + ktime_t expires_next; + struct hrtimer *next_timer; + ktime_t softirq_expires_next; +#ifdef CONFIG_PREEMPT_RT_BASE + wait_queue_head_t wait; +#endif + struct hrtimer *softirq_next_timer; struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; } ____cacheline_aligned; static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time) { - BUILD_BUG_ON(sizeof(struct hrtimer_clock_base) > HRTIMER_CLOCK_BASE_ALIGN); - timer->node.expires = time; timer->_softexpires = time; } @@ -266,16 +300,17 @@ static inline ktime_t hrtimer_cb_get_tim return timer->base->get_time(); } +static inline int hrtimer_is_hres_active(struct hrtimer *timer) +{ + return IS_ENABLED(CONFIG_HIGH_RES_TIMERS) ? + timer->base->cpu_base->hres_active : 0; +} + #ifdef CONFIG_HIGH_RES_TIMERS struct clock_event_device; extern void hrtimer_interrupt(struct clock_event_device *dev); -static inline int hrtimer_is_hres_active(struct hrtimer *timer) -{ - return timer->base->cpu_base->hres_active; -} - /* * The resolution of the clocks. The resolution value is returned in * the clock_getres() system call to give application programmers an @@ -298,11 +333,6 @@ extern unsigned int hrtimer_resolution; #define hrtimer_resolution (unsigned int)LOW_RES_NSEC -static inline int hrtimer_is_hres_active(struct hrtimer *timer) -{ - return 0; -} - static inline void clock_was_set_delayed(void) { } #endif @@ -344,10 +374,17 @@ DECLARE_PER_CPU(struct tick_device, tick /* Initialize timers: */ extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock, enum hrtimer_mode mode); +extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id, + enum hrtimer_mode mode, + struct task_struct *task); #ifdef CONFIG_DEBUG_OBJECTS_TIMERS extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock, enum hrtimer_mode mode); +extern void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl, + clockid_t clock_id, + enum hrtimer_mode mode, + struct task_struct *task); extern void destroy_hrtimer_on_stack(struct hrtimer *timer); #else @@ -357,6 +394,15 @@ static inline void hrtimer_init_on_stack { hrtimer_init(timer, which_clock, mode); } + +static inline void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl, + clockid_t clock_id, + enum hrtimer_mode mode, + struct task_struct *task) +{ + hrtimer_init_sleeper(sl, clock_id, mode, task); +} + static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { } #endif @@ -365,11 +411,12 @@ extern void hrtimer_start_range_ns(struc u64 range_ns, const enum hrtimer_mode mode); /** - * hrtimer_start - (re)start an hrtimer on the current CPU + * hrtimer_start - (re)start an hrtimer * @timer: the timer to be added * @tim: expiry time - * @mode: expiry mode: absolute (HRTIMER_MODE_ABS) or - * relative (HRTIMER_MODE_REL) + * @mode: timer mode: absolute (HRTIMER_MODE_ABS) or + * relative (HRTIMER_MODE_REL), and pinned (HRTIMER_MODE_PINNED); + * softirq based mode is considered for debug purpose only! */ static inline void hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode) @@ -396,6 +443,13 @@ static inline void hrtimer_restart(struc hrtimer_start_expires(timer, HRTIMER_MODE_ABS); } +/* Softirq preemption could deadlock timer removal */ +#ifdef CONFIG_PREEMPT_RT_BASE + extern void hrtimer_wait_for_timer(const struct hrtimer *timer); +#else +# define hrtimer_wait_for_timer(timer) do { cpu_relax(); } while (0) +#endif + /* Query timers: */ extern ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust); @@ -420,9 +474,9 @@ static inline int hrtimer_is_queued(stru * Helper function to check, whether the timer is running the callback * function */ -static inline int hrtimer_callback_running(struct hrtimer *timer) +static inline int hrtimer_callback_running(const struct hrtimer *timer) { - return timer->base->cpu_base->running == timer; + return timer->base->running == timer; } /* Forward a hrtimer so it expires after now: */ @@ -458,15 +512,12 @@ extern long hrtimer_nanosleep(const stru const enum hrtimer_mode mode, const clockid_t clockid); -extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, - struct task_struct *tsk); - extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta, const enum hrtimer_mode mode); extern int schedule_hrtimeout_range_clock(ktime_t *expires, u64 delta, const enum hrtimer_mode mode, - int clock); + clockid_t clock_id); extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode); /* Soft interrupt function to run the hrtimer queues: */ Index: linux-4.14.15-rt12/include/linux/idr.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/idr.h +++ linux-4.14.15-rt12/include/linux/idr.h @@ -167,10 +167,7 @@ static inline bool idr_is_empty(const st * Each idr_preload() should be matched with an invocation of this * function. See idr_preload() for details. */ -static inline void idr_preload_end(void) -{ - preempt_enable(); -} +void idr_preload_end(void); /** * idr_find - return pointer for given id Index: linux-4.14.15-rt12/include/linux/init_task.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/init_task.h +++ linux-4.14.15-rt12/include/linux/init_task.h @@ -163,6 +163,12 @@ extern struct cred init_cred; # define INIT_PERF_EVENTS(tsk) #endif +#if defined(CONFIG_POSIX_TIMERS) && defined(CONFIG_PREEMPT_RT_BASE) +# define INIT_TIMER_LIST .posix_timer_list = NULL, +#else +# define INIT_TIMER_LIST +#endif + #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN # define INIT_VTIME(tsk) \ .vtime.seqcount = SEQCNT_ZERO(tsk.vtime.seqcount), \ @@ -234,7 +240,8 @@ extern struct cred init_cred; .static_prio = MAX_PRIO-20, \ .normal_prio = MAX_PRIO-20, \ .policy = SCHED_NORMAL, \ - .cpus_allowed = CPU_MASK_ALL, \ + .cpus_ptr = &tsk.cpus_mask, \ + .cpus_mask = CPU_MASK_ALL, \ .nr_cpus_allowed= NR_CPUS, \ .mm = NULL, \ .active_mm = &init_mm, \ @@ -276,6 +283,7 @@ extern struct cred init_cred; INIT_CPU_TIMERS(tsk) \ .pi_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \ .timer_slack_ns = 50000, /* 50 usec default slack */ \ + INIT_TIMER_LIST \ .pids = { \ [PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \ [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \ Index: linux-4.14.15-rt12/include/linux/interrupt.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/interrupt.h +++ linux-4.14.15-rt12/include/linux/interrupt.h @@ -15,6 +15,7 @@ #include #include #include +#include #include #include @@ -63,6 +64,7 @@ * interrupt handler after suspending interrupts. For system * wakeup devices users need to implement wakeup detection in * their interrupt handlers. + * IRQF_NO_SOFTIRQ_CALL - Do not process softirqs in the irq thread context (RT) */ #define IRQF_SHARED 0x00000080 #define IRQF_PROBE_SHARED 0x00000100 @@ -76,6 +78,7 @@ #define IRQF_NO_THREAD 0x00010000 #define IRQF_EARLY_RESUME 0x00020000 #define IRQF_COND_SUSPEND 0x00040000 +#define IRQF_NO_SOFTIRQ_CALL 0x00080000 #define IRQF_TIMER (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD) @@ -207,7 +210,7 @@ extern void devm_free_irq(struct device #ifdef CONFIG_LOCKDEP # define local_irq_enable_in_hardirq() do { } while (0) #else -# define local_irq_enable_in_hardirq() local_irq_enable() +# define local_irq_enable_in_hardirq() local_irq_enable_nort() #endif extern void disable_irq_nosync(unsigned int irq); @@ -227,6 +230,7 @@ extern void resume_device_irqs(void); * struct irq_affinity_notify - context for notification of IRQ affinity changes * @irq: Interrupt to which notification applies * @kref: Reference count, for internal use + * @swork: Swork item, for internal use * @work: Work item, for internal use * @notify: Function to be called on change. This will be * called in process context. @@ -238,7 +242,11 @@ extern void resume_device_irqs(void); struct irq_affinity_notify { unsigned int irq; struct kref kref; +#ifdef CONFIG_PREEMPT_RT_BASE + struct swork_event swork; +#else struct work_struct work; +#endif void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); void (*release)(struct kref *ref); }; @@ -429,9 +437,13 @@ extern int irq_set_irqchip_state(unsigne bool state); #ifdef CONFIG_IRQ_FORCED_THREADING +# ifndef CONFIG_PREEMPT_RT_BASE extern bool force_irqthreads; +# else +# define force_irqthreads (true) +# endif #else -#define force_irqthreads (0) +#define force_irqthreads (false) #endif #ifndef __ARCH_SET_SOFTIRQ_PENDING @@ -488,9 +500,10 @@ struct softirq_action void (*action)(struct softirq_action *); }; +#ifndef CONFIG_PREEMPT_RT_FULL asmlinkage void do_softirq(void); asmlinkage void __do_softirq(void); - +static inline void thread_do_softirq(void) { do_softirq(); } #ifdef __ARCH_HAS_DO_SOFTIRQ void do_softirq_own_stack(void); #else @@ -499,13 +512,25 @@ static inline void do_softirq_own_stack( __do_softirq(); } #endif +#else +extern void thread_do_softirq(void); +#endif extern void open_softirq(int nr, void (*action)(struct softirq_action *)); extern void softirq_init(void); extern void __raise_softirq_irqoff(unsigned int nr); +#ifdef CONFIG_PREEMPT_RT_FULL +extern void __raise_softirq_irqoff_ksoft(unsigned int nr); +#else +static inline void __raise_softirq_irqoff_ksoft(unsigned int nr) +{ + __raise_softirq_irqoff(nr); +} +#endif extern void raise_softirq_irqoff(unsigned int nr); extern void raise_softirq(unsigned int nr); +extern void softirq_check_pending_idle(void); DECLARE_PER_CPU(struct task_struct *, ksoftirqd); @@ -527,8 +552,9 @@ static inline struct task_struct *this_c to be executed on some cpu at least once after this. * If the tasklet is already scheduled, but its execution is still not started, it will be executed only once. - * If this tasklet is already running on another CPU (or schedule is called - from tasklet itself), it is rescheduled for later. + * If this tasklet is already running on another CPU, it is rescheduled + for later. + * Schedule must not be called from the tasklet itself (a lockup occurs) * Tasklet is strictly serialized wrt itself, but not wrt another tasklets. If client needs some intertask synchronization, he makes it with spinlocks. @@ -553,27 +579,36 @@ struct tasklet_struct name = { NULL, 0, enum { TASKLET_STATE_SCHED, /* Tasklet is scheduled for execution */ - TASKLET_STATE_RUN /* Tasklet is running (SMP only) */ + TASKLET_STATE_RUN, /* Tasklet is running (SMP only) */ + TASKLET_STATE_PENDING /* Tasklet is pending */ }; -#ifdef CONFIG_SMP +#define TASKLET_STATEF_SCHED (1 << TASKLET_STATE_SCHED) +#define TASKLET_STATEF_RUN (1 << TASKLET_STATE_RUN) +#define TASKLET_STATEF_PENDING (1 << TASKLET_STATE_PENDING) + +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL) static inline int tasklet_trylock(struct tasklet_struct *t) { return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state); } +static inline int tasklet_tryunlock(struct tasklet_struct *t) +{ + return cmpxchg(&t->state, TASKLET_STATEF_RUN, 0) == TASKLET_STATEF_RUN; +} + static inline void tasklet_unlock(struct tasklet_struct *t) { smp_mb__before_atomic(); clear_bit(TASKLET_STATE_RUN, &(t)->state); } -static inline void tasklet_unlock_wait(struct tasklet_struct *t) -{ - while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); } -} +extern void tasklet_unlock_wait(struct tasklet_struct *t); + #else #define tasklet_trylock(t) 1 +#define tasklet_tryunlock(t) 1 #define tasklet_unlock_wait(t) do { } while (0) #define tasklet_unlock(t) do { } while (0) #endif @@ -607,41 +642,17 @@ static inline void tasklet_disable(struc smp_mb(); } -static inline void tasklet_enable(struct tasklet_struct *t) -{ - smp_mb__before_atomic(); - atomic_dec(&t->count); -} - +extern void tasklet_enable(struct tasklet_struct *t); extern void tasklet_kill(struct tasklet_struct *t); extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu); extern void tasklet_init(struct tasklet_struct *t, void (*func)(unsigned long), unsigned long data); -struct tasklet_hrtimer { - struct hrtimer timer; - struct tasklet_struct tasklet; - enum hrtimer_restart (*function)(struct hrtimer *); -}; - -extern void -tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer, - enum hrtimer_restart (*function)(struct hrtimer *), - clockid_t which_clock, enum hrtimer_mode mode); - -static inline -void tasklet_hrtimer_start(struct tasklet_hrtimer *ttimer, ktime_t time, - const enum hrtimer_mode mode) -{ - hrtimer_start(&ttimer->timer, time, mode); -} - -static inline -void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer) -{ - hrtimer_cancel(&ttimer->timer); - tasklet_kill(&ttimer->tasklet); -} +#ifdef CONFIG_PREEMPT_RT_FULL +extern void softirq_early_init(void); +#else +static inline void softirq_early_init(void) { } +#endif /* * Autoprobing for irqs: Index: linux-4.14.15-rt12/include/linux/irq.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/irq.h +++ linux-4.14.15-rt12/include/linux/irq.h @@ -74,6 +74,7 @@ enum irqchip_irq_state; * IRQ_IS_POLLED - Always polled by another interrupt. Exclude * it from the spurious interrupt detection * mechanism and from core side polling. + * IRQ_NO_SOFTIRQ_CALL - No softirq processing in the irq thread context (RT) * IRQ_DISABLE_UNLAZY - Disable lazy irq disable */ enum { @@ -101,13 +102,14 @@ enum { IRQ_PER_CPU_DEVID = (1 << 17), IRQ_IS_POLLED = (1 << 18), IRQ_DISABLE_UNLAZY = (1 << 19), + IRQ_NO_SOFTIRQ_CALL = (1 << 20), }; #define IRQF_MODIFY_MASK \ (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \ IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \ IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \ - IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY) + IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY | IRQ_NO_SOFTIRQ_CALL) #define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) Index: linux-4.14.15-rt12/include/linux/irq_work.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/irq_work.h +++ linux-4.14.15-rt12/include/linux/irq_work.h @@ -17,6 +17,7 @@ #define IRQ_WORK_BUSY 2UL #define IRQ_WORK_FLAGS 3UL #define IRQ_WORK_LAZY 4UL /* Doesn't want IPI, wait for tick */ +#define IRQ_WORK_HARD_IRQ 8UL /* Run hard IRQ context, even on RT */ struct irq_work { unsigned long flags; @@ -52,4 +53,10 @@ static inline bool irq_work_needs_cpu(vo static inline void irq_work_run(void) { } #endif +#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL) +void irq_work_tick_soft(void); +#else +static inline void irq_work_tick_soft(void) { } +#endif + #endif /* _LINUX_IRQ_WORK_H */ Index: linux-4.14.15-rt12/include/linux/irqdesc.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/irqdesc.h +++ linux-4.14.15-rt12/include/linux/irqdesc.h @@ -70,6 +70,7 @@ struct irq_desc { unsigned int irqs_unhandled; atomic_t threads_handled; int threads_handled_last; + u64 random_ip; raw_spinlock_t lock; struct cpumask *percpu_enabled; const struct cpumask *percpu_affinity; Index: linux-4.14.15-rt12/include/linux/irqflags.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/irqflags.h +++ linux-4.14.15-rt12/include/linux/irqflags.h @@ -34,16 +34,6 @@ do { \ current->hardirq_context--; \ crossrelease_hist_end(XHLOCK_HARD); \ } while (0) -# define lockdep_softirq_enter() \ -do { \ - current->softirq_context++; \ - crossrelease_hist_start(XHLOCK_SOFT); \ -} while (0) -# define lockdep_softirq_exit() \ -do { \ - current->softirq_context--; \ - crossrelease_hist_end(XHLOCK_SOFT); \ -} while (0) # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1, #else # define trace_hardirqs_on() do { } while (0) @@ -56,9 +46,23 @@ do { \ # define trace_softirqs_enabled(p) 0 # define trace_hardirq_enter() do { } while (0) # define trace_hardirq_exit() do { } while (0) +# define INIT_TRACE_IRQFLAGS +#endif + +#if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT_FULL) +# define lockdep_softirq_enter() \ +do { \ + current->softirq_context++; \ + crossrelease_hist_start(XHLOCK_SOFT); \ +} while (0) +# define lockdep_softirq_exit() \ +do { \ + current->softirq_context--; \ + crossrelease_hist_end(XHLOCK_SOFT); \ +} while (0) +#else # define lockdep_softirq_enter() do { } while (0) # define lockdep_softirq_exit() do { } while (0) -# define INIT_TRACE_IRQFLAGS #endif #if defined(CONFIG_IRQSOFF_TRACER) || \ @@ -165,4 +169,23 @@ do { \ #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) +/* + * local_irq* variants depending on RT/!RT + */ +#ifdef CONFIG_PREEMPT_RT_FULL +# define local_irq_disable_nort() do { } while (0) +# define local_irq_enable_nort() do { } while (0) +# define local_irq_save_nort(flags) local_save_flags(flags) +# define local_irq_restore_nort(flags) (void)(flags) +# define local_irq_disable_rt() local_irq_disable() +# define local_irq_enable_rt() local_irq_enable() +#else +# define local_irq_disable_nort() local_irq_disable() +# define local_irq_enable_nort() local_irq_enable() +# define local_irq_save_nort(flags) local_irq_save(flags) +# define local_irq_restore_nort(flags) local_irq_restore(flags) +# define local_irq_disable_rt() do { } while (0) +# define local_irq_enable_rt() do { } while (0) +#endif + #endif Index: linux-4.14.15-rt12/include/linux/jbd2.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/jbd2.h +++ linux-4.14.15-rt12/include/linux/jbd2.h @@ -347,32 +347,56 @@ static inline struct journal_head *bh2jh static inline void jbd_lock_bh_state(struct buffer_head *bh) { +#ifndef CONFIG_PREEMPT_RT_BASE bit_spin_lock(BH_State, &bh->b_state); +#else + spin_lock(&bh->b_state_lock); +#endif } static inline int jbd_trylock_bh_state(struct buffer_head *bh) { +#ifndef CONFIG_PREEMPT_RT_BASE return bit_spin_trylock(BH_State, &bh->b_state); +#else + return spin_trylock(&bh->b_state_lock); +#endif } static inline int jbd_is_locked_bh_state(struct buffer_head *bh) { +#ifndef CONFIG_PREEMPT_RT_BASE return bit_spin_is_locked(BH_State, &bh->b_state); +#else + return spin_is_locked(&bh->b_state_lock); +#endif } static inline void jbd_unlock_bh_state(struct buffer_head *bh) { +#ifndef CONFIG_PREEMPT_RT_BASE bit_spin_unlock(BH_State, &bh->b_state); +#else + spin_unlock(&bh->b_state_lock); +#endif } static inline void jbd_lock_bh_journal_head(struct buffer_head *bh) { +#ifndef CONFIG_PREEMPT_RT_BASE bit_spin_lock(BH_JournalHead, &bh->b_state); +#else + spin_lock(&bh->b_journal_head_lock); +#endif } static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh) { +#ifndef CONFIG_PREEMPT_RT_BASE bit_spin_unlock(BH_JournalHead, &bh->b_state); +#else + spin_unlock(&bh->b_journal_head_lock); +#endif } #define J_ASSERT(assert) BUG_ON(!(assert)) Index: linux-4.14.15-rt12/include/linux/kdb.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/kdb.h +++ linux-4.14.15-rt12/include/linux/kdb.h @@ -167,6 +167,7 @@ extern __printf(2, 0) int vkdb_printf(en extern __printf(1, 2) int kdb_printf(const char *, ...); typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...); +#define in_kdb_printk() (kdb_trap_printk) extern void kdb_init(int level); /* Access to kdb specific polling devices */ @@ -201,6 +202,7 @@ extern int kdb_register_flags(char *, kd extern int kdb_unregister(char *); #else /* ! CONFIG_KGDB_KDB */ static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; } +#define in_kdb_printk() (0) static inline void kdb_init(int level) {} static inline int kdb_register(char *cmd, kdb_func_t func, char *usage, char *help, short minlen) { return 0; } Index: linux-4.14.15-rt12/include/linux/kernel.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/kernel.h +++ linux-4.14.15-rt12/include/linux/kernel.h @@ -225,6 +225,9 @@ extern int _cond_resched(void); */ # define might_sleep() \ do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) + +# define might_sleep_no_state_check() \ + do { ___might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0) # define sched_annotate_sleep() (current->task_state_change = 0) #else static inline void ___might_sleep(const char *file, int line, @@ -232,6 +235,7 @@ extern int _cond_resched(void); static inline void __might_sleep(const char *file, int line, int preempt_offset) { } # define might_sleep() do { might_resched(); } while (0) +# define might_sleep_no_state_check() do { might_resched(); } while (0) # define sched_annotate_sleep() do { } while (0) #endif @@ -531,6 +535,7 @@ extern enum system_states { SYSTEM_HALT, SYSTEM_POWER_OFF, SYSTEM_RESTART, + SYSTEM_SUSPEND, } system_state; #define TAINT_PROPRIETARY_MODULE 0 Index: linux-4.14.15-rt12/include/linux/list_bl.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/list_bl.h +++ linux-4.14.15-rt12/include/linux/list_bl.h @@ -3,6 +3,7 @@ #define _LINUX_LIST_BL_H #include +#include #include /* @@ -33,13 +34,24 @@ struct hlist_bl_head { struct hlist_bl_node *first; +#ifdef CONFIG_PREEMPT_RT_BASE + raw_spinlock_t lock; +#endif }; struct hlist_bl_node { struct hlist_bl_node *next, **pprev; }; -#define INIT_HLIST_BL_HEAD(ptr) \ - ((ptr)->first = NULL) + +#ifdef CONFIG_PREEMPT_RT_BASE +#define INIT_HLIST_BL_HEAD(h) \ +do { \ + (h)->first = NULL; \ + raw_spin_lock_init(&(h)->lock); \ +} while (0) +#else +#define INIT_HLIST_BL_HEAD(h) (h)->first = NULL +#endif static inline void INIT_HLIST_BL_NODE(struct hlist_bl_node *h) { @@ -119,12 +131,26 @@ static inline void hlist_bl_del_init(str static inline void hlist_bl_lock(struct hlist_bl_head *b) { +#ifndef CONFIG_PREEMPT_RT_BASE bit_spin_lock(0, (unsigned long *)b); +#else + raw_spin_lock(&b->lock); +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) + __set_bit(0, (unsigned long *)b); +#endif +#endif } static inline void hlist_bl_unlock(struct hlist_bl_head *b) { +#ifndef CONFIG_PREEMPT_RT_BASE __bit_spin_unlock(0, (unsigned long *)b); +#else +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) + __clear_bit(0, (unsigned long *)b); +#endif + raw_spin_unlock(&b->lock); +#endif } static inline bool hlist_bl_is_locked(struct hlist_bl_head *b) Index: linux-4.14.15-rt12/include/linux/locallock.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/locallock.h @@ -0,0 +1,271 @@ +#ifndef _LINUX_LOCALLOCK_H +#define _LINUX_LOCALLOCK_H + +#include +#include + +#ifdef CONFIG_PREEMPT_RT_BASE + +#ifdef CONFIG_DEBUG_SPINLOCK +# define LL_WARN(cond) WARN_ON(cond) +#else +# define LL_WARN(cond) do { } while (0) +#endif + +/* + * per cpu lock based substitute for local_irq_*() + */ +struct local_irq_lock { + spinlock_t lock; + struct task_struct *owner; + int nestcnt; + unsigned long flags; +}; + +#define DEFINE_LOCAL_IRQ_LOCK(lvar) \ + DEFINE_PER_CPU(struct local_irq_lock, lvar) = { \ + .lock = __SPIN_LOCK_UNLOCKED((lvar).lock) } + +#define DECLARE_LOCAL_IRQ_LOCK(lvar) \ + DECLARE_PER_CPU(struct local_irq_lock, lvar) + +#define local_irq_lock_init(lvar) \ + do { \ + int __cpu; \ + for_each_possible_cpu(__cpu) \ + spin_lock_init(&per_cpu(lvar, __cpu).lock); \ + } while (0) + +static inline void __local_lock(struct local_irq_lock *lv) +{ + if (lv->owner != current) { + spin_lock(&lv->lock); + LL_WARN(lv->owner); + LL_WARN(lv->nestcnt); + lv->owner = current; + } + lv->nestcnt++; +} + +#define local_lock(lvar) \ + do { __local_lock(&get_local_var(lvar)); } while (0) + +#define local_lock_on(lvar, cpu) \ + do { __local_lock(&per_cpu(lvar, cpu)); } while (0) + +static inline int __local_trylock(struct local_irq_lock *lv) +{ + if (lv->owner != current && spin_trylock(&lv->lock)) { + LL_WARN(lv->owner); + LL_WARN(lv->nestcnt); + lv->owner = current; + lv->nestcnt = 1; + return 1; + } else if (lv->owner == current) { + lv->nestcnt++; + return 1; + } + return 0; +} + +#define local_trylock(lvar) \ + ({ \ + int __locked; \ + __locked = __local_trylock(&get_local_var(lvar)); \ + if (!__locked) \ + put_local_var(lvar); \ + __locked; \ + }) + +static inline void __local_unlock(struct local_irq_lock *lv) +{ + LL_WARN(lv->nestcnt == 0); + LL_WARN(lv->owner != current); + if (--lv->nestcnt) + return; + + lv->owner = NULL; + spin_unlock(&lv->lock); +} + +#define local_unlock(lvar) \ + do { \ + __local_unlock(this_cpu_ptr(&lvar)); \ + put_local_var(lvar); \ + } while (0) + +#define local_unlock_on(lvar, cpu) \ + do { __local_unlock(&per_cpu(lvar, cpu)); } while (0) + +static inline void __local_lock_irq(struct local_irq_lock *lv) +{ + spin_lock_irqsave(&lv->lock, lv->flags); + LL_WARN(lv->owner); + LL_WARN(lv->nestcnt); + lv->owner = current; + lv->nestcnt = 1; +} + +#define local_lock_irq(lvar) \ + do { __local_lock_irq(&get_local_var(lvar)); } while (0) + +#define local_lock_irq_on(lvar, cpu) \ + do { __local_lock_irq(&per_cpu(lvar, cpu)); } while (0) + +static inline void __local_unlock_irq(struct local_irq_lock *lv) +{ + LL_WARN(!lv->nestcnt); + LL_WARN(lv->owner != current); + lv->owner = NULL; + lv->nestcnt = 0; + spin_unlock_irq(&lv->lock); +} + +#define local_unlock_irq(lvar) \ + do { \ + __local_unlock_irq(this_cpu_ptr(&lvar)); \ + put_local_var(lvar); \ + } while (0) + +#define local_unlock_irq_on(lvar, cpu) \ + do { \ + __local_unlock_irq(&per_cpu(lvar, cpu)); \ + } while (0) + +static inline int __local_lock_irqsave(struct local_irq_lock *lv) +{ + if (lv->owner != current) { + __local_lock_irq(lv); + return 0; + } else { + lv->nestcnt++; + return 1; + } +} + +#define local_lock_irqsave(lvar, _flags) \ + do { \ + if (__local_lock_irqsave(&get_local_var(lvar))) \ + put_local_var(lvar); \ + _flags = __this_cpu_read(lvar.flags); \ + } while (0) + +#define local_lock_irqsave_on(lvar, _flags, cpu) \ + do { \ + __local_lock_irqsave(&per_cpu(lvar, cpu)); \ + _flags = per_cpu(lvar, cpu).flags; \ + } while (0) + +static inline int __local_unlock_irqrestore(struct local_irq_lock *lv, + unsigned long flags) +{ + LL_WARN(!lv->nestcnt); + LL_WARN(lv->owner != current); + if (--lv->nestcnt) + return 0; + + lv->owner = NULL; + spin_unlock_irqrestore(&lv->lock, lv->flags); + return 1; +} + +#define local_unlock_irqrestore(lvar, flags) \ + do { \ + if (__local_unlock_irqrestore(this_cpu_ptr(&lvar), flags)) \ + put_local_var(lvar); \ + } while (0) + +#define local_unlock_irqrestore_on(lvar, flags, cpu) \ + do { \ + __local_unlock_irqrestore(&per_cpu(lvar, cpu), flags); \ + } while (0) + +#define local_spin_trylock_irq(lvar, lock) \ + ({ \ + int __locked; \ + local_lock_irq(lvar); \ + __locked = spin_trylock(lock); \ + if (!__locked) \ + local_unlock_irq(lvar); \ + __locked; \ + }) + +#define local_spin_lock_irq(lvar, lock) \ + do { \ + local_lock_irq(lvar); \ + spin_lock(lock); \ + } while (0) + +#define local_spin_unlock_irq(lvar, lock) \ + do { \ + spin_unlock(lock); \ + local_unlock_irq(lvar); \ + } while (0) + +#define local_spin_lock_irqsave(lvar, lock, flags) \ + do { \ + local_lock_irqsave(lvar, flags); \ + spin_lock(lock); \ + } while (0) + +#define local_spin_unlock_irqrestore(lvar, lock, flags) \ + do { \ + spin_unlock(lock); \ + local_unlock_irqrestore(lvar, flags); \ + } while (0) + +#define get_locked_var(lvar, var) \ + (*({ \ + local_lock(lvar); \ + this_cpu_ptr(&var); \ + })) + +#define put_locked_var(lvar, var) local_unlock(lvar); + +#define local_lock_cpu(lvar) \ + ({ \ + local_lock(lvar); \ + smp_processor_id(); \ + }) + +#define local_unlock_cpu(lvar) local_unlock(lvar) + +#else /* PREEMPT_RT_BASE */ + +#define DEFINE_LOCAL_IRQ_LOCK(lvar) __typeof__(const int) lvar +#define DECLARE_LOCAL_IRQ_LOCK(lvar) extern __typeof__(const int) lvar + +static inline void local_irq_lock_init(int lvar) { } + +#define local_trylock(lvar) \ + ({ \ + preempt_disable(); \ + 1; \ + }) + +#define local_lock(lvar) preempt_disable() +#define local_unlock(lvar) preempt_enable() +#define local_lock_irq(lvar) local_irq_disable() +#define local_lock_irq_on(lvar, cpu) local_irq_disable() +#define local_unlock_irq(lvar) local_irq_enable() +#define local_unlock_irq_on(lvar, cpu) local_irq_enable() +#define local_lock_irqsave(lvar, flags) local_irq_save(flags) +#define local_unlock_irqrestore(lvar, flags) local_irq_restore(flags) + +#define local_spin_trylock_irq(lvar, lock) spin_trylock_irq(lock) +#define local_spin_lock_irq(lvar, lock) spin_lock_irq(lock) +#define local_spin_unlock_irq(lvar, lock) spin_unlock_irq(lock) +#define local_spin_lock_irqsave(lvar, lock, flags) \ + spin_lock_irqsave(lock, flags) +#define local_spin_unlock_irqrestore(lvar, lock, flags) \ + spin_unlock_irqrestore(lock, flags) + +#define get_locked_var(lvar, var) get_cpu_var(var) +#define put_locked_var(lvar, var) put_cpu_var(var) + +#define local_lock_cpu(lvar) get_cpu() +#define local_unlock_cpu(lvar) put_cpu() + +#endif + +#endif Index: linux-4.14.15-rt12/include/linux/mm_types.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/mm_types.h +++ linux-4.14.15-rt12/include/linux/mm_types.h @@ -12,6 +12,7 @@ #include #include #include +#include #include #include @@ -496,6 +497,9 @@ struct mm_struct { bool tlb_flush_batched; #endif struct uprobes_state uprobes_state; +#ifdef CONFIG_PREEMPT_RT_BASE + struct rcu_head delayed_drop; +#endif #ifdef CONFIG_HUGETLB_PAGE atomic_long_t hugetlb_usage; #endif Index: linux-4.14.15-rt12/include/linux/mutex.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/mutex.h +++ linux-4.14.15-rt12/include/linux/mutex.h @@ -23,6 +23,17 @@ struct ww_acquire_ctx; +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \ + , .dep_map = { .name = #lockname } +#else +# define __DEP_MAP_MUTEX_INITIALIZER(lockname) +#endif + +#ifdef CONFIG_PREEMPT_RT_FULL +# include +#else + /* * Simple, straightforward mutexes with strict semantics: * @@ -114,13 +125,6 @@ do { \ __mutex_init((mutex), #mutex, &__key); \ } while (0) -#ifdef CONFIG_DEBUG_LOCK_ALLOC -# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \ - , .dep_map = { .name = #lockname } -#else -# define __DEP_MAP_MUTEX_INITIALIZER(lockname) -#endif - #define __MUTEX_INITIALIZER(lockname) \ { .owner = ATOMIC_LONG_INIT(0) \ , .wait_lock = __SPIN_LOCK_UNLOCKED(lockname.wait_lock) \ @@ -228,4 +232,6 @@ mutex_trylock_recursive(struct mutex *lo return mutex_trylock(lock); } +#endif /* !PREEMPT_RT_FULL */ + #endif /* __LINUX_MUTEX_H */ Index: linux-4.14.15-rt12/include/linux/mutex_rt.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/mutex_rt.h @@ -0,0 +1,130 @@ +#ifndef __LINUX_MUTEX_RT_H +#define __LINUX_MUTEX_RT_H + +#ifndef __LINUX_MUTEX_H +#error "Please include mutex.h" +#endif + +#include + +/* FIXME: Just for __lockfunc */ +#include + +struct mutex { + struct rt_mutex lock; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +}; + +#define __MUTEX_INITIALIZER(mutexname) \ + { \ + .lock = __RT_MUTEX_INITIALIZER(mutexname.lock) \ + __DEP_MAP_MUTEX_INITIALIZER(mutexname) \ + } + +#define DEFINE_MUTEX(mutexname) \ + struct mutex mutexname = __MUTEX_INITIALIZER(mutexname) + +extern void __mutex_do_init(struct mutex *lock, const char *name, struct lock_class_key *key); +extern void __lockfunc _mutex_lock(struct mutex *lock); +extern void __lockfunc _mutex_lock_io(struct mutex *lock); +extern void __lockfunc _mutex_lock_io_nested(struct mutex *lock, int subclass); +extern int __lockfunc _mutex_lock_interruptible(struct mutex *lock); +extern int __lockfunc _mutex_lock_killable(struct mutex *lock); +extern void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass); +extern void __lockfunc _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest_lock); +extern int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass); +extern int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass); +extern int __lockfunc _mutex_trylock(struct mutex *lock); +extern void __lockfunc _mutex_unlock(struct mutex *lock); + +#define mutex_is_locked(l) rt_mutex_is_locked(&(l)->lock) +#define mutex_lock(l) _mutex_lock(l) +#define mutex_lock_interruptible(l) _mutex_lock_interruptible(l) +#define mutex_lock_killable(l) _mutex_lock_killable(l) +#define mutex_trylock(l) _mutex_trylock(l) +#define mutex_unlock(l) _mutex_unlock(l) +#define mutex_lock_io(l) _mutex_lock_io(l); + +#define __mutex_owner(l) ((l)->lock.owner) + +#ifdef CONFIG_DEBUG_MUTEXES +#define mutex_destroy(l) rt_mutex_destroy(&(l)->lock) +#else +static inline void mutex_destroy(struct mutex *lock) {} +#endif + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define mutex_lock_nested(l, s) _mutex_lock_nested(l, s) +# define mutex_lock_interruptible_nested(l, s) \ + _mutex_lock_interruptible_nested(l, s) +# define mutex_lock_killable_nested(l, s) \ + _mutex_lock_killable_nested(l, s) +# define mutex_lock_io_nested(l, s) _mutex_lock_io_nested(l, s) + +# define mutex_lock_nest_lock(lock, nest_lock) \ +do { \ + typecheck(struct lockdep_map *, &(nest_lock)->dep_map); \ + _mutex_lock_nest_lock(lock, &(nest_lock)->dep_map); \ +} while (0) + +#else +# define mutex_lock_nested(l, s) _mutex_lock(l) +# define mutex_lock_interruptible_nested(l, s) \ + _mutex_lock_interruptible(l) +# define mutex_lock_killable_nested(l, s) \ + _mutex_lock_killable(l) +# define mutex_lock_nest_lock(lock, nest_lock) mutex_lock(lock) +# define mutex_lock_io_nested(l, s) _mutex_lock_io(l) +#endif + +# define mutex_init(mutex) \ +do { \ + static struct lock_class_key __key; \ + \ + rt_mutex_init(&(mutex)->lock); \ + __mutex_do_init((mutex), #mutex, &__key); \ +} while (0) + +# define __mutex_init(mutex, name, key) \ +do { \ + rt_mutex_init(&(mutex)->lock); \ + __mutex_do_init((mutex), name, key); \ +} while (0) + +/** + * These values are chosen such that FAIL and SUCCESS match the + * values of the regular mutex_trylock(). + */ +enum mutex_trylock_recursive_enum { + MUTEX_TRYLOCK_FAILED = 0, + MUTEX_TRYLOCK_SUCCESS = 1, + MUTEX_TRYLOCK_RECURSIVE, +}; +/** + * mutex_trylock_recursive - trylock variant that allows recursive locking + * @lock: mutex to be locked + * + * This function should not be used, _ever_. It is purely for hysterical GEM + * raisins, and once those are gone this will be removed. + * + * Returns: + * MUTEX_TRYLOCK_FAILED - trylock failed, + * MUTEX_TRYLOCK_SUCCESS - lock acquired, + * MUTEX_TRYLOCK_RECURSIVE - we already owned the lock. + */ +int __rt_mutex_owner_current(struct rt_mutex *lock); + +static inline /* __deprecated */ __must_check enum mutex_trylock_recursive_enum +mutex_trylock_recursive(struct mutex *lock) +{ + if (unlikely(__rt_mutex_owner_current(&lock->lock))) + return MUTEX_TRYLOCK_RECURSIVE; + + return mutex_trylock(lock); +} + +extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock); + +#endif Index: linux-4.14.15-rt12/include/linux/netdevice.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/netdevice.h +++ linux-4.14.15-rt12/include/linux/netdevice.h @@ -409,7 +409,19 @@ typedef enum rx_handler_result rx_handle typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb); void __napi_schedule(struct napi_struct *n); + +/* + * When PREEMPT_RT_FULL is defined, all device interrupt handlers + * run as threads, and they can also be preempted (without PREEMPT_RT + * interrupt threads can not be preempted). Which means that calling + * __napi_schedule_irqoff() from an interrupt handler can be preempted + * and can corrupt the napi->poll_list. + */ +#ifdef CONFIG_PREEMPT_RT_FULL +#define __napi_schedule_irqoff(n) __napi_schedule(n) +#else void __napi_schedule_irqoff(struct napi_struct *n); +#endif static inline bool napi_disable_pending(struct napi_struct *n) { @@ -571,7 +583,11 @@ struct netdev_queue { * write-mostly part */ spinlock_t _xmit_lock ____cacheline_aligned_in_smp; +#ifdef CONFIG_PREEMPT_RT_FULL + struct task_struct *xmit_lock_owner; +#else int xmit_lock_owner; +#endif /* * Time (in jiffies) of last Tx */ @@ -2433,14 +2449,53 @@ void netdev_freemem(struct net_device *d void synchronize_net(void); int init_dummy_netdev(struct net_device *dev); -DECLARE_PER_CPU(int, xmit_recursion); #define XMIT_RECURSION_LIMIT 10 +#ifdef CONFIG_PREEMPT_RT_FULL +static inline int dev_recursion_level(void) +{ + return current->xmit_recursion; +} + +static inline int xmit_rec_read(void) +{ + return current->xmit_recursion; +} + +static inline void xmit_rec_inc(void) +{ + current->xmit_recursion++; +} + +static inline void xmit_rec_dec(void) +{ + current->xmit_recursion--; +} + +#else + +DECLARE_PER_CPU(int, xmit_recursion); static inline int dev_recursion_level(void) { return this_cpu_read(xmit_recursion); } +static inline int xmit_rec_read(void) +{ + return __this_cpu_read(xmit_recursion); +} + +static inline void xmit_rec_inc(void) +{ + __this_cpu_inc(xmit_recursion); +} + +static inline void xmit_rec_dec(void) +{ + __this_cpu_dec(xmit_recursion); +} +#endif + struct net_device *dev_get_by_index(struct net *net, int ifindex); struct net_device *__dev_get_by_index(struct net *net, int ifindex); struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); @@ -2772,6 +2827,7 @@ struct softnet_data { unsigned int dropped; struct sk_buff_head input_pkt_queue; struct napi_struct backlog; + struct sk_buff_head tofree_queue; }; @@ -3495,10 +3551,48 @@ static inline u32 netif_msg_init(int deb return (1 << debug_value) - 1; } +#ifdef CONFIG_PREEMPT_RT_FULL +static inline void netdev_queue_set_owner(struct netdev_queue *txq, int cpu) +{ + txq->xmit_lock_owner = current; +} + +static inline void netdev_queue_clear_owner(struct netdev_queue *txq) +{ + txq->xmit_lock_owner = NULL; +} + +static inline bool netdev_queue_has_owner(struct netdev_queue *txq) +{ + if (txq->xmit_lock_owner != NULL) + return true; + return false; +} + +#else + +static inline void netdev_queue_set_owner(struct netdev_queue *txq, int cpu) +{ + txq->xmit_lock_owner = cpu; +} + +static inline void netdev_queue_clear_owner(struct netdev_queue *txq) +{ + txq->xmit_lock_owner = -1; +} + +static inline bool netdev_queue_has_owner(struct netdev_queue *txq) +{ + if (txq->xmit_lock_owner != -1) + return true; + return false; +} +#endif + static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) { spin_lock(&txq->_xmit_lock); - txq->xmit_lock_owner = cpu; + netdev_queue_set_owner(txq, cpu); } static inline bool __netif_tx_acquire(struct netdev_queue *txq) @@ -3515,32 +3609,32 @@ static inline void __netif_tx_release(st static inline void __netif_tx_lock_bh(struct netdev_queue *txq) { spin_lock_bh(&txq->_xmit_lock); - txq->xmit_lock_owner = smp_processor_id(); + netdev_queue_set_owner(txq, smp_processor_id()); } static inline bool __netif_tx_trylock(struct netdev_queue *txq) { bool ok = spin_trylock(&txq->_xmit_lock); if (likely(ok)) - txq->xmit_lock_owner = smp_processor_id(); + netdev_queue_set_owner(txq, smp_processor_id()); return ok; } static inline void __netif_tx_unlock(struct netdev_queue *txq) { - txq->xmit_lock_owner = -1; + netdev_queue_clear_owner(txq); spin_unlock(&txq->_xmit_lock); } static inline void __netif_tx_unlock_bh(struct netdev_queue *txq) { - txq->xmit_lock_owner = -1; + netdev_queue_clear_owner(txq); spin_unlock_bh(&txq->_xmit_lock); } static inline void txq_trans_update(struct netdev_queue *txq) { - if (txq->xmit_lock_owner != -1) + if (netdev_queue_has_owner(txq)) txq->trans_start = jiffies; } Index: linux-4.14.15-rt12/include/linux/netfilter/x_tables.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/netfilter/x_tables.h +++ linux-4.14.15-rt12/include/linux/netfilter/x_tables.h @@ -6,6 +6,7 @@ #include #include #include +#include #include /* Test a struct->invflags and a boolean for inequality */ @@ -338,6 +339,8 @@ void xt_free_table_info(struct xt_table_ */ DECLARE_PER_CPU(seqcount_t, xt_recseq); +DECLARE_LOCAL_IRQ_LOCK(xt_write_lock); + /* xt_tee_enabled - true if x_tables needs to handle reentrancy * * Enabled if current ip(6)tables ruleset has at least one -j TEE rule. @@ -358,6 +361,9 @@ static inline unsigned int xt_write_recs { unsigned int addend; + /* RT protection */ + local_lock(xt_write_lock); + /* * Low order bit of sequence is set if we already * called xt_write_recseq_begin(). @@ -388,6 +394,7 @@ static inline void xt_write_recseq_end(u /* this is kind of a write_seqcount_end(), but addend is 0 or 1 */ smp_wmb(); __this_cpu_add(xt_recseq.sequence, addend); + local_unlock(xt_write_lock); } /* Index: linux-4.14.15-rt12/include/linux/nfs_fs.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/nfs_fs.h +++ linux-4.14.15-rt12/include/linux/nfs_fs.h @@ -162,7 +162,11 @@ struct nfs_inode { /* Readers: in-flight sillydelete RPC calls */ /* Writers: rmdir */ +#ifdef CONFIG_PREEMPT_RT_BASE + struct semaphore rmdir_sem; +#else struct rw_semaphore rmdir_sem; +#endif struct mutex commit_mutex; #if IS_ENABLED(CONFIG_NFS_V4) Index: linux-4.14.15-rt12/include/linux/nfs_xdr.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/nfs_xdr.h +++ linux-4.14.15-rt12/include/linux/nfs_xdr.h @@ -1530,7 +1530,7 @@ struct nfs_unlinkdata { struct nfs_removeargs args; struct nfs_removeres res; struct dentry *dentry; - wait_queue_head_t wq; + struct swait_queue_head wq; struct rpc_cred *cred; struct nfs_fattr dir_attr; long timeout; Index: linux-4.14.15-rt12/include/linux/notifier.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/notifier.h +++ linux-4.14.15-rt12/include/linux/notifier.h @@ -7,7 +7,7 @@ * * Alan Cox */ - + #ifndef _LINUX_NOTIFIER_H #define _LINUX_NOTIFIER_H #include @@ -43,9 +43,7 @@ * in srcu_notifier_call_chain(): no cache bounces and no memory barriers. * As compensation, srcu_notifier_chain_unregister() is rather expensive. * SRCU notifier chains should be used when the chain will be called very - * often but notifier_blocks will seldom be removed. Also, SRCU notifier - * chains are slightly more difficult to use because they require special - * runtime initialization. + * often but notifier_blocks will seldom be removed. */ struct notifier_block; @@ -91,7 +89,7 @@ struct srcu_notifier_head { (name)->head = NULL; \ } while (0) -/* srcu_notifier_heads must be initialized and cleaned up dynamically */ +/* srcu_notifier_heads must be cleaned up dynamically */ extern void srcu_init_notifier_head(struct srcu_notifier_head *nh); #define srcu_cleanup_notifier_head(name) \ cleanup_srcu_struct(&(name)->srcu); @@ -104,7 +102,13 @@ extern void srcu_init_notifier_head(stru .head = NULL } #define RAW_NOTIFIER_INIT(name) { \ .head = NULL } -/* srcu_notifier_heads cannot be initialized statically */ + +#define SRCU_NOTIFIER_INIT(name, pcpu) \ + { \ + .mutex = __MUTEX_INITIALIZER(name.mutex), \ + .head = NULL, \ + .srcu = __SRCU_STRUCT_INIT(name.srcu, pcpu), \ + } #define ATOMIC_NOTIFIER_HEAD(name) \ struct atomic_notifier_head name = \ @@ -116,6 +120,26 @@ extern void srcu_init_notifier_head(stru struct raw_notifier_head name = \ RAW_NOTIFIER_INIT(name) +#ifdef CONFIG_TREE_SRCU +#define _SRCU_NOTIFIER_HEAD(name, mod) \ + static DEFINE_PER_CPU(struct srcu_data, \ + name##_head_srcu_data); \ + mod struct srcu_notifier_head name = \ + SRCU_NOTIFIER_INIT(name, name##_head_srcu_data) + +#else +#define _SRCU_NOTIFIER_HEAD(name, mod) \ + mod struct srcu_notifier_head name = \ + SRCU_NOTIFIER_INIT(name, name) + +#endif + +#define SRCU_NOTIFIER_HEAD(name) \ + _SRCU_NOTIFIER_HEAD(name, ) + +#define SRCU_NOTIFIER_HEAD_STATIC(name) \ + _SRCU_NOTIFIER_HEAD(name, static) + #ifdef __KERNEL__ extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh, @@ -185,12 +209,12 @@ static inline int notifier_to_errno(int /* * Declared notifiers so far. I can imagine quite a few more chains - * over time (eg laptop power reset chains, reboot chain (to clean + * over time (eg laptop power reset chains, reboot chain (to clean * device units up), device [un]mount chain, module load/unload chain, - * low memory chain, screenblank chain (for plug in modular screenblankers) + * low memory chain, screenblank chain (for plug in modular screenblankers) * VC switch chains (for loadable kernel svgalib VC switch helpers) etc... */ - + /* CPU notfiers are defined in include/linux/cpu.h. */ /* netdevice notifiers are defined in include/linux/netdevice.h */ Index: linux-4.14.15-rt12/include/linux/percpu-rwsem.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/percpu-rwsem.h +++ linux-4.14.15-rt12/include/linux/percpu-rwsem.h @@ -29,7 +29,7 @@ static struct percpu_rw_semaphore name = extern int __percpu_down_read(struct percpu_rw_semaphore *, int); extern void __percpu_up_read(struct percpu_rw_semaphore *); -static inline void percpu_down_read_preempt_disable(struct percpu_rw_semaphore *sem) +static inline void percpu_down_read(struct percpu_rw_semaphore *sem) { might_sleep(); @@ -47,16 +47,10 @@ static inline void percpu_down_read_pree __this_cpu_inc(*sem->read_count); if (unlikely(!rcu_sync_is_idle(&sem->rss))) __percpu_down_read(sem, false); /* Unconditional memory barrier */ - barrier(); /* - * The barrier() prevents the compiler from + * The preempt_enable() prevents the compiler from * bleeding the critical section out. */ -} - -static inline void percpu_down_read(struct percpu_rw_semaphore *sem) -{ - percpu_down_read_preempt_disable(sem); preempt_enable(); } @@ -83,13 +77,9 @@ static inline int percpu_down_read_trylo return ret; } -static inline void percpu_up_read_preempt_enable(struct percpu_rw_semaphore *sem) +static inline void percpu_up_read(struct percpu_rw_semaphore *sem) { - /* - * The barrier() prevents the compiler from - * bleeding the critical section out. - */ - barrier(); + preempt_disable(); /* * Same as in percpu_down_read(). */ @@ -102,12 +92,6 @@ static inline void percpu_up_read_preemp rwsem_release(&sem->rw_sem.dep_map, 1, _RET_IP_); } -static inline void percpu_up_read(struct percpu_rw_semaphore *sem) -{ - preempt_disable(); - percpu_up_read_preempt_enable(sem); -} - extern void percpu_down_write(struct percpu_rw_semaphore *); extern void percpu_up_write(struct percpu_rw_semaphore *); Index: linux-4.14.15-rt12/include/linux/percpu.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/percpu.h +++ linux-4.14.15-rt12/include/linux/percpu.h @@ -19,6 +19,35 @@ #define PERCPU_MODULE_RESERVE 0 #endif +#ifdef CONFIG_PREEMPT_RT_FULL + +#define get_local_var(var) (*({ \ + migrate_disable(); \ + this_cpu_ptr(&var); })) + +#define put_local_var(var) do { \ + (void)&(var); \ + migrate_enable(); \ +} while (0) + +# define get_local_ptr(var) ({ \ + migrate_disable(); \ + this_cpu_ptr(var); }) + +# define put_local_ptr(var) do { \ + (void)(var); \ + migrate_enable(); \ +} while (0) + +#else + +#define get_local_var(var) get_cpu_var(var) +#define put_local_var(var) put_cpu_var(var) +#define get_local_ptr(var) get_cpu_ptr(var) +#define put_local_ptr(var) put_cpu_ptr(var) + +#endif + /* minimum unit size, also is the maximum supported allocation size */ #define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10) Index: linux-4.14.15-rt12/include/linux/pid.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/pid.h +++ linux-4.14.15-rt12/include/linux/pid.h @@ -3,6 +3,7 @@ #define _LINUX_PID_H #include +#include enum pid_type { Index: linux-4.14.15-rt12/include/linux/preempt.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/preempt.h +++ linux-4.14.15-rt12/include/linux/preempt.h @@ -51,7 +51,11 @@ #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT) #define NMI_OFFSET (1UL << NMI_SHIFT) -#define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET) +#ifndef CONFIG_PREEMPT_RT_FULL +# define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET) +#else +# define SOFTIRQ_DISABLE_OFFSET (0) +#endif /* We use the MSB mostly because its available */ #define PREEMPT_NEED_RESCHED 0x80000000 @@ -81,9 +85,15 @@ #include #define hardirq_count() (preempt_count() & HARDIRQ_MASK) -#define softirq_count() (preempt_count() & SOFTIRQ_MASK) #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK \ | NMI_MASK)) +#ifndef CONFIG_PREEMPT_RT_FULL +# define softirq_count() (preempt_count() & SOFTIRQ_MASK) +# define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET) +#else +# define softirq_count() (0UL) +extern int in_serving_softirq(void); +#endif /* * Are we doing bottom half or hardware interrupt processing? @@ -101,7 +111,6 @@ #define in_irq() (hardirq_count()) #define in_softirq() (softirq_count()) #define in_interrupt() (irq_count()) -#define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET) #define in_nmi() (preempt_count() & NMI_MASK) #define in_task() (!(preempt_count() & \ (NMI_MASK | HARDIRQ_MASK | SOFTIRQ_OFFSET))) @@ -118,7 +127,11 @@ /* * The preempt_count offset after spin_lock() */ +#if !defined(CONFIG_PREEMPT_RT_FULL) #define PREEMPT_LOCK_OFFSET PREEMPT_DISABLE_OFFSET +#else +#define PREEMPT_LOCK_OFFSET 0 +#endif /* * The preempt_count offset needed for things like: @@ -167,6 +180,20 @@ extern void preempt_count_sub(int val); #define preempt_count_inc() preempt_count_add(1) #define preempt_count_dec() preempt_count_sub(1) +#ifdef CONFIG_PREEMPT_LAZY +#define add_preempt_lazy_count(val) do { preempt_lazy_count() += (val); } while (0) +#define sub_preempt_lazy_count(val) do { preempt_lazy_count() -= (val); } while (0) +#define inc_preempt_lazy_count() add_preempt_lazy_count(1) +#define dec_preempt_lazy_count() sub_preempt_lazy_count(1) +#define preempt_lazy_count() (current_thread_info()->preempt_lazy_count) +#else +#define add_preempt_lazy_count(val) do { } while (0) +#define sub_preempt_lazy_count(val) do { } while (0) +#define inc_preempt_lazy_count() do { } while (0) +#define dec_preempt_lazy_count() do { } while (0) +#define preempt_lazy_count() (0) +#endif + #ifdef CONFIG_PREEMPT_COUNT #define preempt_disable() \ @@ -175,16 +202,53 @@ do { \ barrier(); \ } while (0) +#define preempt_lazy_disable() \ +do { \ + inc_preempt_lazy_count(); \ + barrier(); \ +} while (0) + #define sched_preempt_enable_no_resched() \ do { \ barrier(); \ preempt_count_dec(); \ } while (0) -#define preempt_enable_no_resched() sched_preempt_enable_no_resched() +#ifdef CONFIG_PREEMPT_RT_BASE +# define preempt_enable_no_resched() sched_preempt_enable_no_resched() +# define preempt_check_resched_rt() preempt_check_resched() +#else +# define preempt_enable_no_resched() preempt_enable() +# define preempt_check_resched_rt() barrier(); +#endif #define preemptible() (preempt_count() == 0 && !irqs_disabled()) +#ifdef CONFIG_SMP + +extern void migrate_disable(void); +extern void migrate_enable(void); + +int __migrate_disabled(struct task_struct *p); + +#elif !defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE) + +extern void migrate_disable(void); +extern void migrate_enable(void); +static inline int __migrate_disabled(struct task_struct *p) +{ + return 0; +} + +#else +#define migrate_disable() barrier() +#define migrate_enable() barrier() +static inline int __migrate_disabled(struct task_struct *p) +{ + return 0; +} +#endif + #ifdef CONFIG_PREEMPT #define preempt_enable() \ do { \ @@ -206,6 +270,13 @@ do { \ __preempt_schedule(); \ } while (0) +#define preempt_lazy_enable() \ +do { \ + dec_preempt_lazy_count(); \ + barrier(); \ + preempt_check_resched(); \ +} while (0) + #else /* !CONFIG_PREEMPT */ #define preempt_enable() \ do { \ @@ -213,6 +284,12 @@ do { \ preempt_count_dec(); \ } while (0) +#define preempt_lazy_enable() \ +do { \ + dec_preempt_lazy_count(); \ + barrier(); \ +} while (0) + #define preempt_enable_notrace() \ do { \ barrier(); \ @@ -251,8 +328,16 @@ do { \ #define preempt_disable_notrace() barrier() #define preempt_enable_no_resched_notrace() barrier() #define preempt_enable_notrace() barrier() +#define preempt_check_resched_rt() barrier() #define preemptible() 0 +#define migrate_disable() barrier() +#define migrate_enable() barrier() + +static inline int __migrate_disabled(struct task_struct *p) +{ + return 0; +} #endif /* CONFIG_PREEMPT_COUNT */ #ifdef MODULE @@ -271,10 +356,22 @@ do { \ } while (0) #define preempt_fold_need_resched() \ do { \ - if (tif_need_resched()) \ + if (tif_need_resched_now()) \ set_preempt_need_resched(); \ } while (0) +#ifdef CONFIG_PREEMPT_RT_FULL +# define preempt_disable_rt() preempt_disable() +# define preempt_enable_rt() preempt_enable() +# define preempt_disable_nort() barrier() +# define preempt_enable_nort() barrier() +#else +# define preempt_disable_rt() barrier() +# define preempt_enable_rt() barrier() +# define preempt_disable_nort() preempt_disable() +# define preempt_enable_nort() preempt_enable() +#endif + #ifdef CONFIG_PREEMPT_NOTIFIERS struct preempt_notifier; Index: linux-4.14.15-rt12/include/linux/printk.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/printk.h +++ linux-4.14.15-rt12/include/linux/printk.h @@ -142,9 +142,11 @@ struct va_format { #ifdef CONFIG_EARLY_PRINTK extern asmlinkage __printf(1, 2) void early_printk(const char *fmt, ...); +extern void printk_kill(void); #else static inline __printf(1, 2) __cold void early_printk(const char *s, ...) { } +static inline void printk_kill(void) { } #endif #ifdef CONFIG_PRINTK_NMI Index: linux-4.14.15-rt12/include/linux/radix-tree.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/radix-tree.h +++ linux-4.14.15-rt12/include/linux/radix-tree.h @@ -328,6 +328,8 @@ unsigned int radix_tree_gang_lookup_slot int radix_tree_preload(gfp_t gfp_mask); int radix_tree_maybe_preload(gfp_t gfp_mask); int radix_tree_maybe_preload_order(gfp_t gfp_mask, int order); +void radix_tree_preload_end(void); + void radix_tree_init(void); void *radix_tree_tag_set(struct radix_tree_root *, unsigned long index, unsigned int tag); @@ -347,11 +349,6 @@ unsigned int radix_tree_gang_lookup_tag_ unsigned int max_items, unsigned int tag); int radix_tree_tagged(const struct radix_tree_root *, unsigned int tag); -static inline void radix_tree_preload_end(void) -{ - preempt_enable(); -} - int radix_tree_split_preload(unsigned old_order, unsigned new_order, gfp_t); int radix_tree_split(struct radix_tree_root *, unsigned long index, unsigned new_order); Index: linux-4.14.15-rt12/include/linux/random.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/random.h +++ linux-4.14.15-rt12/include/linux/random.h @@ -32,7 +32,7 @@ static inline void add_latent_entropy(vo extern void add_input_randomness(unsigned int type, unsigned int code, unsigned int value) __latent_entropy; -extern void add_interrupt_randomness(int irq, int irq_flags) __latent_entropy; +extern void add_interrupt_randomness(int irq, int irq_flags, __u64 ip) __latent_entropy; extern void get_random_bytes(void *buf, int nbytes); extern int wait_for_random_bytes(void); Index: linux-4.14.15-rt12/include/linux/rbtree.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/rbtree.h +++ linux-4.14.15-rt12/include/linux/rbtree.h @@ -31,7 +31,7 @@ #include #include -#include +#include struct rb_node { unsigned long __rb_parent_color; Index: linux-4.14.15-rt12/include/linux/rbtree_augmented.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/rbtree_augmented.h +++ linux-4.14.15-rt12/include/linux/rbtree_augmented.h @@ -26,6 +26,7 @@ #include #include +#include /* * Please note - only struct rb_augment_callbacks and the prototypes for Index: linux-4.14.15-rt12/include/linux/rbtree_latch.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/rbtree_latch.h +++ linux-4.14.15-rt12/include/linux/rbtree_latch.h @@ -35,6 +35,7 @@ #include #include +#include struct latch_tree_node { struct rb_node node[2]; Index: linux-4.14.15-rt12/include/linux/rcu_assign_pointer.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/rcu_assign_pointer.h @@ -0,0 +1,54 @@ +#ifndef __LINUX_RCU_ASSIGN_POINTER_H__ +#define __LINUX_RCU_ASSIGN_POINTER_H__ +#include +#include + +/** + * RCU_INITIALIZER() - statically initialize an RCU-protected global variable + * @v: The value to statically initialize with. + */ +#define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v) + +/** + * rcu_assign_pointer() - assign to RCU-protected pointer + * @p: pointer to assign to + * @v: value to assign (publish) + * + * Assigns the specified value to the specified RCU-protected + * pointer, ensuring that any concurrent RCU readers will see + * any prior initialization. + * + * Inserts memory barriers on architectures that require them + * (which is most of them), and also prevents the compiler from + * reordering the code that initializes the structure after the pointer + * assignment. More importantly, this call documents which pointers + * will be dereferenced by RCU read-side code. + * + * In some special cases, you may use RCU_INIT_POINTER() instead + * of rcu_assign_pointer(). RCU_INIT_POINTER() is a bit faster due + * to the fact that it does not constrain either the CPU or the compiler. + * That said, using RCU_INIT_POINTER() when you should have used + * rcu_assign_pointer() is a very bad thing that results in + * impossible-to-diagnose memory corruption. So please be careful. + * See the RCU_INIT_POINTER() comment header for details. + * + * Note that rcu_assign_pointer() evaluates each of its arguments only + * once, appearances notwithstanding. One of the "extra" evaluations + * is in typeof() and the other visible only to sparse (__CHECKER__), + * neither of which actually execute the argument. As with most cpp + * macros, this execute-arguments-only-once property is important, so + * please be careful when making changes to rcu_assign_pointer() and the + * other macros that it invokes. + */ +#define rcu_assign_pointer(p, v) \ +({ \ + uintptr_t _r_a_p__v = (uintptr_t)(v); \ + \ + if (__builtin_constant_p(v) && (_r_a_p__v) == (uintptr_t)NULL) \ + WRITE_ONCE((p), (typeof(p))(_r_a_p__v)); \ + else \ + smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \ + _r_a_p__v; \ +}) + +#endif Index: linux-4.14.15-rt12/include/linux/rcupdate.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/rcupdate.h +++ linux-4.14.15-rt12/include/linux/rcupdate.h @@ -42,6 +42,7 @@ #include #include #include +#include #define ULONG_CMP_GE(a, b) (ULONG_MAX / 2 >= (a) - (b)) #define ULONG_CMP_LT(a, b) (ULONG_MAX / 2 < (a) - (b)) @@ -55,7 +56,11 @@ void call_rcu(struct rcu_head *head, rcu #define call_rcu call_rcu_sched #endif /* #else #ifdef CONFIG_PREEMPT_RCU */ +#ifdef CONFIG_PREEMPT_RT_FULL +#define call_rcu_bh call_rcu +#else void call_rcu_bh(struct rcu_head *head, rcu_callback_t func); +#endif void call_rcu_sched(struct rcu_head *head, rcu_callback_t func); void synchronize_sched(void); void rcu_barrier_tasks(void); @@ -74,6 +79,11 @@ void synchronize_rcu(void); * types of kernel builds, the rcu_read_lock() nesting depth is unknowable. */ #define rcu_preempt_depth() (current->rcu_read_lock_nesting) +#ifndef CONFIG_PREEMPT_RT_FULL +#define sched_rcu_preempt_depth() rcu_preempt_depth() +#else +static inline int sched_rcu_preempt_depth(void) { return 0; } +#endif #else /* #ifdef CONFIG_PREEMPT_RCU */ @@ -99,6 +109,8 @@ static inline int rcu_preempt_depth(void return 0; } +#define sched_rcu_preempt_depth() rcu_preempt_depth() + #endif /* #else #ifdef CONFIG_PREEMPT_RCU */ /* Internal to kernel */ @@ -255,7 +267,14 @@ extern struct lockdep_map rcu_sched_lock extern struct lockdep_map rcu_callback_map; int debug_lockdep_rcu_enabled(void); int rcu_read_lock_held(void); +#ifdef CONFIG_PREEMPT_RT_FULL +static inline int rcu_read_lock_bh_held(void) +{ + return rcu_read_lock_held(); +} +#else int rcu_read_lock_bh_held(void); +#endif int rcu_read_lock_sched_held(void); #else /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ @@ -365,54 +384,6 @@ static inline void rcu_preempt_sleep_che }) /** - * RCU_INITIALIZER() - statically initialize an RCU-protected global variable - * @v: The value to statically initialize with. - */ -#define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v) - -/** - * rcu_assign_pointer() - assign to RCU-protected pointer - * @p: pointer to assign to - * @v: value to assign (publish) - * - * Assigns the specified value to the specified RCU-protected - * pointer, ensuring that any concurrent RCU readers will see - * any prior initialization. - * - * Inserts memory barriers on architectures that require them - * (which is most of them), and also prevents the compiler from - * reordering the code that initializes the structure after the pointer - * assignment. More importantly, this call documents which pointers - * will be dereferenced by RCU read-side code. - * - * In some special cases, you may use RCU_INIT_POINTER() instead - * of rcu_assign_pointer(). RCU_INIT_POINTER() is a bit faster due - * to the fact that it does not constrain either the CPU or the compiler. - * That said, using RCU_INIT_POINTER() when you should have used - * rcu_assign_pointer() is a very bad thing that results in - * impossible-to-diagnose memory corruption. So please be careful. - * See the RCU_INIT_POINTER() comment header for details. - * - * Note that rcu_assign_pointer() evaluates each of its arguments only - * once, appearances notwithstanding. One of the "extra" evaluations - * is in typeof() and the other visible only to sparse (__CHECKER__), - * neither of which actually execute the argument. As with most cpp - * macros, this execute-arguments-only-once property is important, so - * please be careful when making changes to rcu_assign_pointer() and the - * other macros that it invokes. - */ -#define rcu_assign_pointer(p, v) \ -({ \ - uintptr_t _r_a_p__v = (uintptr_t)(v); \ - \ - if (__builtin_constant_p(v) && (_r_a_p__v) == (uintptr_t)NULL) \ - WRITE_ONCE((p), (typeof(p))(_r_a_p__v)); \ - else \ - smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \ - _r_a_p__v; \ -}) - -/** * rcu_swap_protected() - swap an RCU and a regular pointer * @rcu_ptr: RCU pointer * @ptr: regular pointer @@ -707,10 +678,14 @@ static inline void rcu_read_unlock(void) static inline void rcu_read_lock_bh(void) { local_bh_disable(); +#ifdef CONFIG_PREEMPT_RT_FULL + rcu_read_lock(); +#else __acquire(RCU_BH); rcu_lock_acquire(&rcu_bh_lock_map); RCU_LOCKDEP_WARN(!rcu_is_watching(), "rcu_read_lock_bh() used illegally while idle"); +#endif } /* @@ -720,10 +695,14 @@ static inline void rcu_read_lock_bh(void */ static inline void rcu_read_unlock_bh(void) { +#ifdef CONFIG_PREEMPT_RT_FULL + rcu_read_unlock(); +#else RCU_LOCKDEP_WARN(!rcu_is_watching(), "rcu_read_unlock_bh() used illegally while idle"); rcu_lock_release(&rcu_bh_lock_map); __release(RCU_BH); +#endif local_bh_enable(); } Index: linux-4.14.15-rt12/include/linux/rcutree.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/rcutree.h +++ linux-4.14.15-rt12/include/linux/rcutree.h @@ -44,7 +44,11 @@ static inline void rcu_virt_note_context rcu_note_context_switch(false); } +#ifdef CONFIG_PREEMPT_RT_FULL +# define synchronize_rcu_bh synchronize_rcu +#else void synchronize_rcu_bh(void); +#endif void synchronize_sched_expedited(void); void synchronize_rcu_expedited(void); @@ -72,7 +76,11 @@ static inline void synchronize_rcu_bh_ex } void rcu_barrier(void); +#ifdef CONFIG_PREEMPT_RT_FULL +# define rcu_barrier_bh rcu_barrier +#else void rcu_barrier_bh(void); +#endif void rcu_barrier_sched(void); unsigned long get_state_synchronize_rcu(void); void cond_synchronize_rcu(unsigned long oldstate); Index: linux-4.14.15-rt12/include/linux/ring_buffer.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/ring_buffer.h +++ linux-4.14.15-rt12/include/linux/ring_buffer.h @@ -34,10 +34,12 @@ struct ring_buffer_event { * array[0] = time delta (28 .. 59) * size = 8 bytes * - * @RINGBUF_TYPE_TIME_STAMP: Sync time stamp with external clock - * array[0] = tv_nsec - * array[1..2] = tv_sec - * size = 16 bytes + * @RINGBUF_TYPE_TIME_STAMP: Absolute timestamp + * Same format as TIME_EXTEND except that the + * value is an absolute timestamp, not a delta + * event.time_delta contains bottom 27 bits + * array[0] = top (28 .. 59) bits + * size = 8 bytes * * <= @RINGBUF_TYPE_DATA_TYPE_LEN_MAX: * Data record @@ -54,12 +56,12 @@ enum ring_buffer_type { RINGBUF_TYPE_DATA_TYPE_LEN_MAX = 28, RINGBUF_TYPE_PADDING, RINGBUF_TYPE_TIME_EXTEND, - /* FIXME: RINGBUF_TYPE_TIME_STAMP not implemented */ RINGBUF_TYPE_TIME_STAMP, }; unsigned ring_buffer_event_length(struct ring_buffer_event *event); void *ring_buffer_event_data(struct ring_buffer_event *event); +u64 ring_buffer_event_time_stamp(struct ring_buffer_event *event); /* * ring_buffer_discard_commit will remove an event that has not @@ -115,6 +117,9 @@ int ring_buffer_unlock_commit(struct rin int ring_buffer_write(struct ring_buffer *buffer, unsigned long length, void *data); +void ring_buffer_nest_start(struct ring_buffer *buffer); +void ring_buffer_nest_end(struct ring_buffer *buffer); + struct ring_buffer_event * ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts, unsigned long *lost_events); @@ -178,6 +183,8 @@ void ring_buffer_normalize_time_stamp(st int cpu, u64 *ts); void ring_buffer_set_clock(struct ring_buffer *buffer, u64 (*clock)(void)); +void ring_buffer_set_time_stamp_abs(struct ring_buffer *buffer, bool abs); +bool ring_buffer_time_stamp_abs(struct ring_buffer *buffer); size_t ring_buffer_page_len(void *page); Index: linux-4.14.15-rt12/include/linux/rtmutex.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/rtmutex.h +++ linux-4.14.15-rt12/include/linux/rtmutex.h @@ -14,11 +14,15 @@ #define __LINUX_RT_MUTEX_H #include +#include #include -#include extern int max_lock_depth; /* for sysctl */ +#ifdef CONFIG_DEBUG_MUTEXES +#include +#endif + /** * The rt_mutex structure * @@ -31,8 +35,8 @@ struct rt_mutex { raw_spinlock_t wait_lock; struct rb_root_cached waiters; struct task_struct *owner; -#ifdef CONFIG_DEBUG_RT_MUTEXES int save_state; +#ifdef CONFIG_DEBUG_RT_MUTEXES const char *name, *file; int line; void *magic; @@ -82,16 +86,23 @@ do { \ #define __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname) #endif -#define __RT_MUTEX_INITIALIZER(mutexname) \ - { .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \ +#define __RT_MUTEX_INITIALIZER_PLAIN(mutexname) \ + .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \ , .waiters = RB_ROOT_CACHED \ , .owner = NULL \ __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \ - __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname)} + __DEP_MAP_RT_MUTEX_INITIALIZER(mutexname) + +#define __RT_MUTEX_INITIALIZER(mutexname) \ + { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) } #define DEFINE_RT_MUTEX(mutexname) \ struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname) +#define __RT_MUTEX_INITIALIZER_SAVE_STATE(mutexname) \ + { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) \ + , .save_state = 1 } + /** * rt_mutex_is_locked - is the mutex locked * @lock: the mutex to be queried @@ -108,6 +119,7 @@ extern void rt_mutex_destroy(struct rt_m extern void rt_mutex_lock(struct rt_mutex *lock); extern int rt_mutex_lock_interruptible(struct rt_mutex *lock); +extern int rt_mutex_lock_killable(struct rt_mutex *lock); extern int rt_mutex_timed_lock(struct rt_mutex *lock, struct hrtimer_sleeper *timeout); Index: linux-4.14.15-rt12/include/linux/rwlock_rt.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/rwlock_rt.h @@ -0,0 +1,119 @@ +#ifndef __LINUX_RWLOCK_RT_H +#define __LINUX_RWLOCK_RT_H + +#ifndef __LINUX_SPINLOCK_H +#error Do not include directly. Use spinlock.h +#endif + +extern void __lockfunc rt_write_lock(rwlock_t *rwlock); +extern void __lockfunc rt_read_lock(rwlock_t *rwlock); +extern int __lockfunc rt_write_trylock(rwlock_t *rwlock); +extern int __lockfunc rt_read_trylock(rwlock_t *rwlock); +extern void __lockfunc rt_write_unlock(rwlock_t *rwlock); +extern void __lockfunc rt_read_unlock(rwlock_t *rwlock); +extern int __lockfunc rt_read_can_lock(rwlock_t *rwlock); +extern int __lockfunc rt_write_can_lock(rwlock_t *rwlock); +extern void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key); + +#define read_can_lock(rwlock) rt_read_can_lock(rwlock) +#define write_can_lock(rwlock) rt_write_can_lock(rwlock) + +#define read_trylock(lock) __cond_lock(lock, rt_read_trylock(lock)) +#define write_trylock(lock) __cond_lock(lock, rt_write_trylock(lock)) + +static inline int __write_trylock_rt_irqsave(rwlock_t *lock, unsigned long *flags) +{ + /* XXX ARCH_IRQ_ENABLED */ + *flags = 0; + return rt_write_trylock(lock); +} + +#define write_trylock_irqsave(lock, flags) \ + __cond_lock(lock, __write_trylock_rt_irqsave(lock, &(flags))) + +#define read_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + rt_read_lock(lock); \ + flags = 0; \ + } while (0) + +#define write_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + rt_write_lock(lock); \ + flags = 0; \ + } while (0) + +#define read_lock(lock) rt_read_lock(lock) + +#define read_lock_bh(lock) \ + do { \ + local_bh_disable(); \ + rt_read_lock(lock); \ + } while (0) + +#define read_lock_irq(lock) read_lock(lock) + +#define write_lock(lock) rt_write_lock(lock) + +#define write_lock_bh(lock) \ + do { \ + local_bh_disable(); \ + rt_write_lock(lock); \ + } while (0) + +#define write_lock_irq(lock) write_lock(lock) + +#define read_unlock(lock) rt_read_unlock(lock) + +#define read_unlock_bh(lock) \ + do { \ + rt_read_unlock(lock); \ + local_bh_enable(); \ + } while (0) + +#define read_unlock_irq(lock) read_unlock(lock) + +#define write_unlock(lock) rt_write_unlock(lock) + +#define write_unlock_bh(lock) \ + do { \ + rt_write_unlock(lock); \ + local_bh_enable(); \ + } while (0) + +#define write_unlock_irq(lock) write_unlock(lock) + +#define read_unlock_irqrestore(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + (void) flags; \ + rt_read_unlock(lock); \ + } while (0) + +#define write_unlock_irqrestore(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + (void) flags; \ + rt_write_unlock(lock); \ + } while (0) + +#define rwlock_init(rwl) \ +do { \ + static struct lock_class_key __key; \ + \ + __rt_rwlock_init(rwl, #rwl, &__key); \ +} while (0) + +/* + * Internal functions made global for CPU pinning + */ +void __read_rt_lock(struct rt_rw_lock *lock); +int __read_rt_trylock(struct rt_rw_lock *lock); +void __write_rt_lock(struct rt_rw_lock *lock); +int __write_rt_trylock(struct rt_rw_lock *lock); +void __read_rt_unlock(struct rt_rw_lock *lock); +void __write_rt_unlock(struct rt_rw_lock *lock); + +#endif Index: linux-4.14.15-rt12/include/linux/rwlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/rwlock_types.h +++ linux-4.14.15-rt12/include/linux/rwlock_types.h @@ -1,6 +1,10 @@ #ifndef __LINUX_RWLOCK_TYPES_H #define __LINUX_RWLOCK_TYPES_H +#if !defined(__LINUX_SPINLOCK_TYPES_H) +# error "Do not include directly, include spinlock_types.h" +#endif + /* * include/linux/rwlock_types.h - generic rwlock type definitions * and initializers Index: linux-4.14.15-rt12/include/linux/rwlock_types_rt.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/rwlock_types_rt.h @@ -0,0 +1,55 @@ +#ifndef __LINUX_RWLOCK_TYPES_RT_H +#define __LINUX_RWLOCK_TYPES_RT_H + +#ifndef __LINUX_SPINLOCK_TYPES_H +#error "Do not include directly. Include spinlock_types.h instead" +#endif + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } +#else +# define RW_DEP_MAP_INIT(lockname) +#endif + +typedef struct rt_rw_lock rwlock_t; + +#define __RW_LOCK_UNLOCKED(name) __RWLOCK_RT_INITIALIZER(name) + +#define DEFINE_RWLOCK(name) \ + rwlock_t name = __RW_LOCK_UNLOCKED(name) + +/* + * A reader biased implementation primarily for CPU pinning. + * + * Can be selected as general replacement for the single reader RT rwlock + * variant + */ +struct rt_rw_lock { + struct rt_mutex rtmutex; + atomic_t readers; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +}; + +#define READER_BIAS (1U << 31) +#define WRITER_BIAS (1U << 30) + +#define __RWLOCK_RT_INITIALIZER(name) \ +{ \ + .readers = ATOMIC_INIT(READER_BIAS), \ + .rtmutex = __RT_MUTEX_INITIALIZER_SAVE_STATE(name.rtmutex), \ + RW_DEP_MAP_INIT(name) \ +} + +void __rwlock_biased_rt_init(struct rt_rw_lock *lock, const char *name, + struct lock_class_key *key); + +#define rwlock_biased_rt_init(rwlock) \ + do { \ + static struct lock_class_key __key; \ + \ + __rwlock_biased_rt_init((rwlock), #rwlock, &__key); \ + } while (0) + +#endif Index: linux-4.14.15-rt12/include/linux/rwsem.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/rwsem.h +++ linux-4.14.15-rt12/include/linux/rwsem.h @@ -20,6 +20,10 @@ #include #endif +#ifdef CONFIG_PREEMPT_RT_FULL +#include +#else /* PREEMPT_RT_FULL */ + struct rw_semaphore; #ifdef CONFIG_RWSEM_GENERIC_SPINLOCK @@ -108,6 +112,13 @@ static inline int rwsem_is_contended(str return !list_empty(&sem->wait_list); } +#endif /* !PREEMPT_RT_FULL */ + +/* + * The functions below are the same for all rwsem implementations including + * the RT specific variant. + */ + /* * lock for reading */ Index: linux-4.14.15-rt12/include/linux/rwsem_rt.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/rwsem_rt.h @@ -0,0 +1,67 @@ +#ifndef _LINUX_RWSEM_RT_H +#define _LINUX_RWSEM_RT_H + +#ifndef _LINUX_RWSEM_H +#error "Include rwsem.h" +#endif + +#include +#include + +#define READER_BIAS (1U << 31) +#define WRITER_BIAS (1U << 30) + +struct rw_semaphore { + atomic_t readers; + struct rt_mutex rtmutex; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +}; + +#define __RWSEM_INITIALIZER(name) \ +{ \ + .readers = ATOMIC_INIT(READER_BIAS), \ + .rtmutex = __RT_MUTEX_INITIALIZER(name.rtmutex), \ + RW_DEP_MAP_INIT(name) \ +} + +#define DECLARE_RWSEM(lockname) \ + struct rw_semaphore lockname = __RWSEM_INITIALIZER(lockname) + +extern void __rwsem_init(struct rw_semaphore *rwsem, const char *name, + struct lock_class_key *key); + +#define __init_rwsem(sem, name, key) \ +do { \ + rt_mutex_init(&(sem)->rtmutex); \ + __rwsem_init((sem), (name), (key)); \ +} while (0) + +#define init_rwsem(sem) \ +do { \ + static struct lock_class_key __key; \ + \ + __init_rwsem((sem), #sem, &__key); \ +} while (0) + +static inline int rwsem_is_locked(struct rw_semaphore *sem) +{ + return atomic_read(&sem->readers) != READER_BIAS; +} + +static inline int rwsem_is_contended(struct rw_semaphore *sem) +{ + return atomic_read(&sem->readers) > 0; +} + +extern void __down_read(struct rw_semaphore *sem); +extern int __down_read_trylock(struct rw_semaphore *sem); +extern void __down_write(struct rw_semaphore *sem); +extern int __must_check __down_write_killable(struct rw_semaphore *sem); +extern int __down_write_trylock(struct rw_semaphore *sem); +extern void __up_read(struct rw_semaphore *sem); +extern void __up_write(struct rw_semaphore *sem); +extern void __downgrade_write(struct rw_semaphore *sem); + +#endif Index: linux-4.14.15-rt12/include/linux/sched.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/sched.h +++ linux-4.14.15-rt12/include/linux/sched.h @@ -27,6 +27,7 @@ #include #include #include +#include /* task_struct member predeclarations (sorted alphabetically): */ struct audit_context; @@ -93,7 +94,6 @@ struct task_group; /* Convenience macros for the sake of wake_up(): */ #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) -#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) /* get_task_state(): */ #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ @@ -101,12 +101,8 @@ struct task_group; __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \ TASK_PARKED) -#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) - #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) -#define task_is_stopped_or_traced(task) ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) - #define task_contributes_to_load(task) ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ (task->flags & PF_FROZEN) == 0 && \ (task->state & TASK_NOLOAD) == 0) @@ -124,6 +120,11 @@ struct task_group; smp_store_mb(current->state, (state_value)); \ } while (0) +#define __set_current_state_no_track(state_value) \ + current->state = (state_value); +#define set_current_state_no_track(state_value) \ + smp_store_mb(current->state, (state_value)); + #else /* * set_current_state() includes a barrier so that the write of current->state @@ -161,6 +162,9 @@ struct task_group; */ #define __set_current_state(state_value) do { current->state = (state_value); } while (0) #define set_current_state(state_value) smp_store_mb(current->state, (state_value)) + +#define __set_current_state_no_track(state_value) __set_current_state(state_value) +#define set_current_state_no_track(state_value) set_current_state(state_value) #endif /* Task command name length: */ @@ -526,6 +530,8 @@ struct task_struct { #endif /* -1 unrunnable, 0 runnable, >0 stopped: */ volatile long state; + /* saved state for "spinlock sleepers" */ + volatile long saved_state; /* * This begins the randomizable portion of task_struct. Only @@ -578,7 +584,22 @@ struct task_struct { unsigned int policy; int nr_cpus_allowed; - cpumask_t cpus_allowed; + const cpumask_t *cpus_ptr; + cpumask_t cpus_mask; +#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP) + int migrate_disable; + int migrate_disable_update; + int pinned_on_cpu; +# ifdef CONFIG_SCHED_DEBUG + int migrate_disable_atomic; +# endif + +#elif !defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE) + int migrate_disable; +# ifdef CONFIG_SCHED_DEBUG + int migrate_disable_atomic; +# endif +#endif #ifdef CONFIG_PREEMPT_RCU int rcu_read_lock_nesting; @@ -737,6 +758,9 @@ struct task_struct { #ifdef CONFIG_POSIX_TIMERS struct task_cputime cputime_expires; struct list_head cpu_timers[3]; +#ifdef CONFIG_PREEMPT_RT_BASE + struct task_struct *posix_timer_list; +#endif #endif /* Process credentials: */ @@ -780,11 +804,17 @@ struct task_struct { /* Signal handlers: */ struct signal_struct *signal; struct sighand_struct *sighand; + struct sigqueue *sigqueue_cache; + sigset_t blocked; sigset_t real_blocked; /* Restored if set_restore_sigmask() was used: */ sigset_t saved_sigmask; struct sigpending pending; +#ifdef CONFIG_PREEMPT_RT_FULL + /* TODO: move me into ->restart_block ? */ + struct siginfo forced_info; +#endif unsigned long sas_ss_sp; size_t sas_ss_size; unsigned int sas_ss_flags; @@ -809,6 +839,7 @@ struct task_struct { raw_spinlock_t pi_lock; struct wake_q_node wake_q; + struct wake_q_node wake_q_sleeper; #ifdef CONFIG_RT_MUTEXES /* PI waiters blocked on a rt_mutex held by this task: */ @@ -1076,9 +1107,23 @@ struct task_struct { unsigned int sequential_io; unsigned int sequential_io_avg; #endif +#ifdef CONFIG_PREEMPT_RT_BASE + struct rcu_head put_rcu; + int softirq_nestcnt; + unsigned int softirqs_raised; +#endif +#ifdef CONFIG_PREEMPT_RT_FULL +# if defined CONFIG_HIGHMEM || defined CONFIG_X86_32 + int kmap_idx; + pte_t kmap_pte[KM_TYPE_NR]; +# endif +#endif #ifdef CONFIG_DEBUG_ATOMIC_SLEEP unsigned long task_state_change; #endif +#ifdef CONFIG_PREEMPT_RT_FULL + int xmit_recursion; +#endif int pagefault_disabled; #ifdef CONFIG_MMU struct task_struct *oom_reaper_list; @@ -1292,6 +1337,7 @@ extern struct pid *cad_pid; /* * Per process flags */ +#define PF_IN_SOFTIRQ 0x00000001 /* Task is serving softirq */ #define PF_IDLE 0x00000002 /* I am an IDLE thread */ #define PF_EXITING 0x00000004 /* Getting shut down */ #define PF_EXITPIDONE 0x00000008 /* PI exit done on shut down */ @@ -1315,7 +1361,7 @@ extern struct pid *cad_pid; #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */ #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ -#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ +#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */ #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ @@ -1487,6 +1533,7 @@ extern struct task_struct *find_task_by_ extern int wake_up_state(struct task_struct *tsk, unsigned int state); extern int wake_up_process(struct task_struct *tsk); +extern int wake_up_lock_sleeper(struct task_struct *tsk); extern void wake_up_new_task(struct task_struct *tsk); #ifdef CONFIG_SMP @@ -1563,6 +1610,89 @@ static inline int test_tsk_need_resched( return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); } +#ifdef CONFIG_PREEMPT_LAZY +static inline void set_tsk_need_resched_lazy(struct task_struct *tsk) +{ + set_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY); +} + +static inline void clear_tsk_need_resched_lazy(struct task_struct *tsk) +{ + clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY); +} + +static inline int test_tsk_need_resched_lazy(struct task_struct *tsk) +{ + return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY)); +} + +static inline int need_resched_lazy(void) +{ + return test_thread_flag(TIF_NEED_RESCHED_LAZY); +} + +static inline int need_resched_now(void) +{ + return test_thread_flag(TIF_NEED_RESCHED); +} + +#else +static inline void clear_tsk_need_resched_lazy(struct task_struct *tsk) { } +static inline int need_resched_lazy(void) { return 0; } + +static inline int need_resched_now(void) +{ + return test_thread_flag(TIF_NEED_RESCHED); +} + +#endif + + +static inline bool __task_is_stopped_or_traced(struct task_struct *task) +{ + if (task->state & (__TASK_STOPPED | __TASK_TRACED)) + return true; +#ifdef CONFIG_PREEMPT_RT_FULL + if (task->saved_state & (__TASK_STOPPED | __TASK_TRACED)) + return true; +#endif + return false; +} + +static inline bool task_is_stopped_or_traced(struct task_struct *task) +{ + bool traced_stopped; + +#ifdef CONFIG_PREEMPT_RT_FULL + unsigned long flags; + + raw_spin_lock_irqsave(&task->pi_lock, flags); + traced_stopped = __task_is_stopped_or_traced(task); + raw_spin_unlock_irqrestore(&task->pi_lock, flags); +#else + traced_stopped = __task_is_stopped_or_traced(task); +#endif + return traced_stopped; +} + +static inline bool task_is_traced(struct task_struct *task) +{ + bool traced = false; + + if (task->state & __TASK_TRACED) + return true; +#ifdef CONFIG_PREEMPT_RT_FULL + /* in case the task is sleeping on tasklist_lock */ + raw_spin_lock_irq(&task->pi_lock); + if (task->state & __TASK_TRACED) + traced = true; + else if (task->saved_state & __TASK_TRACED) + traced = true; + raw_spin_unlock_irq(&task->pi_lock); +#endif + return traced; +} + /* * cond_resched() and cond_resched_lock(): latency reduction via * explicit rescheduling in places that are safe. The return @@ -1588,12 +1718,16 @@ extern int __cond_resched_lock(spinlock_ __cond_resched_lock(lock); \ }) +#ifndef CONFIG_PREEMPT_RT_FULL extern int __cond_resched_softirq(void); #define cond_resched_softirq() ({ \ ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ __cond_resched_softirq(); \ }) +#else +# define cond_resched_softirq() cond_resched() +#endif static inline void cond_resched_rcu(void) { Index: linux-4.14.15-rt12/include/linux/sched/mm.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/sched/mm.h +++ linux-4.14.15-rt12/include/linux/sched/mm.h @@ -43,6 +43,17 @@ static inline void mmdrop(struct mm_stru __mmdrop(mm); } +#ifdef CONFIG_PREEMPT_RT_BASE +extern void __mmdrop_delayed(struct rcu_head *rhp); +static inline void mmdrop_delayed(struct mm_struct *mm) +{ + if (atomic_dec_and_test(&mm->mm_count)) + call_rcu(&mm->delayed_drop, __mmdrop_delayed); +} +#else +# define mmdrop_delayed(mm) mmdrop(mm) +#endif + static inline void mmdrop_async_fn(struct work_struct *work) { struct mm_struct *mm = container_of(work, struct mm_struct, async_put_work); Index: linux-4.14.15-rt12/include/linux/sched/task.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/sched/task.h +++ linux-4.14.15-rt12/include/linux/sched/task.h @@ -88,6 +88,15 @@ extern void sched_exec(void); #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) +#ifdef CONFIG_PREEMPT_RT_BASE +extern void __put_task_struct_cb(struct rcu_head *rhp); + +static inline void put_task_struct(struct task_struct *t) +{ + if (atomic_dec_and_test(&t->usage)) + call_rcu(&t->put_rcu, __put_task_struct_cb); +} +#else extern void __put_task_struct(struct task_struct *t); static inline void put_task_struct(struct task_struct *t) @@ -95,7 +104,7 @@ static inline void put_task_struct(struc if (atomic_dec_and_test(&t->usage)) __put_task_struct(t); } - +#endif struct task_struct *task_rcu_dereference(struct task_struct **ptask); #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT Index: linux-4.14.15-rt12/include/linux/sched/wake_q.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/sched/wake_q.h +++ linux-4.14.15-rt12/include/linux/sched/wake_q.h @@ -47,8 +47,29 @@ static inline void wake_q_init(struct wa head->lastp = &head->first; } -extern void wake_q_add(struct wake_q_head *head, - struct task_struct *task); -extern void wake_up_q(struct wake_q_head *head); +extern void __wake_q_add(struct wake_q_head *head, + struct task_struct *task, bool sleeper); +static inline void wake_q_add(struct wake_q_head *head, + struct task_struct *task) +{ + __wake_q_add(head, task, false); +} + +static inline void wake_q_add_sleeper(struct wake_q_head *head, + struct task_struct *task) +{ + __wake_q_add(head, task, true); +} + +extern void __wake_up_q(struct wake_q_head *head, bool sleeper); +static inline void wake_up_q(struct wake_q_head *head) +{ + __wake_up_q(head, false); +} + +static inline void wake_up_q_sleeper(struct wake_q_head *head) +{ + __wake_up_q(head, true); +} #endif /* _LINUX_SCHED_WAKE_Q_H */ Index: linux-4.14.15-rt12/include/linux/seqlock.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/seqlock.h +++ linux-4.14.15-rt12/include/linux/seqlock.h @@ -221,20 +221,30 @@ static inline int read_seqcount_retry(co return __read_seqcount_retry(s, start); } - - -static inline void raw_write_seqcount_begin(seqcount_t *s) +static inline void __raw_write_seqcount_begin(seqcount_t *s) { s->sequence++; smp_wmb(); } -static inline void raw_write_seqcount_end(seqcount_t *s) +static inline void raw_write_seqcount_begin(seqcount_t *s) +{ + preempt_disable_rt(); + __raw_write_seqcount_begin(s); +} + +static inline void __raw_write_seqcount_end(seqcount_t *s) { smp_wmb(); s->sequence++; } +static inline void raw_write_seqcount_end(seqcount_t *s) +{ + __raw_write_seqcount_end(s); + preempt_enable_rt(); +} + /** * raw_write_seqcount_barrier - do a seq write barrier * @s: pointer to seqcount_t @@ -429,10 +439,32 @@ typedef struct { /* * Read side functions for starting and finalizing a read side section. */ +#ifndef CONFIG_PREEMPT_RT_FULL static inline unsigned read_seqbegin(const seqlock_t *sl) { return read_seqcount_begin(&sl->seqcount); } +#else +/* + * Starvation safe read side for RT + */ +static inline unsigned read_seqbegin(seqlock_t *sl) +{ + unsigned ret; + +repeat: + ret = ACCESS_ONCE(sl->seqcount.sequence); + if (unlikely(ret & 1)) { + /* + * Take the lock and let the writer proceed (i.e. evtl + * boost it), otherwise we could loop here forever. + */ + spin_unlock_wait(&sl->lock); + goto repeat; + } + return ret; +} +#endif static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start) { @@ -447,36 +479,45 @@ static inline unsigned read_seqretry(con static inline void write_seqlock(seqlock_t *sl) { spin_lock(&sl->lock); - write_seqcount_begin(&sl->seqcount); + __raw_write_seqcount_begin(&sl->seqcount); +} + +static inline int try_write_seqlock(seqlock_t *sl) +{ + if (spin_trylock(&sl->lock)) { + __raw_write_seqcount_begin(&sl->seqcount); + return 1; + } + return 0; } static inline void write_sequnlock(seqlock_t *sl) { - write_seqcount_end(&sl->seqcount); + __raw_write_seqcount_end(&sl->seqcount); spin_unlock(&sl->lock); } static inline void write_seqlock_bh(seqlock_t *sl) { spin_lock_bh(&sl->lock); - write_seqcount_begin(&sl->seqcount); + __raw_write_seqcount_begin(&sl->seqcount); } static inline void write_sequnlock_bh(seqlock_t *sl) { - write_seqcount_end(&sl->seqcount); + __raw_write_seqcount_end(&sl->seqcount); spin_unlock_bh(&sl->lock); } static inline void write_seqlock_irq(seqlock_t *sl) { spin_lock_irq(&sl->lock); - write_seqcount_begin(&sl->seqcount); + __raw_write_seqcount_begin(&sl->seqcount); } static inline void write_sequnlock_irq(seqlock_t *sl) { - write_seqcount_end(&sl->seqcount); + __raw_write_seqcount_end(&sl->seqcount); spin_unlock_irq(&sl->lock); } @@ -485,7 +526,7 @@ static inline unsigned long __write_seql unsigned long flags; spin_lock_irqsave(&sl->lock, flags); - write_seqcount_begin(&sl->seqcount); + __raw_write_seqcount_begin(&sl->seqcount); return flags; } @@ -495,7 +536,7 @@ static inline unsigned long __write_seql static inline void write_sequnlock_irqrestore(seqlock_t *sl, unsigned long flags) { - write_seqcount_end(&sl->seqcount); + __raw_write_seqcount_end(&sl->seqcount); spin_unlock_irqrestore(&sl->lock, flags); } Index: linux-4.14.15-rt12/include/linux/signal.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/signal.h +++ linux-4.14.15-rt12/include/linux/signal.h @@ -243,6 +243,7 @@ static inline void init_sigpending(struc } extern void flush_sigqueue(struct sigpending *queue); +extern void flush_task_sigqueue(struct task_struct *tsk); /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */ static inline int valid_signal(unsigned long sig) Index: linux-4.14.15-rt12/include/linux/skbuff.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/skbuff.h +++ linux-4.14.15-rt12/include/linux/skbuff.h @@ -287,6 +287,7 @@ struct sk_buff_head { __u32 qlen; spinlock_t lock; + raw_spinlock_t raw_lock; }; struct sk_buff; @@ -1667,6 +1668,12 @@ static inline void skb_queue_head_init(s __skb_queue_head_init(list); } +static inline void skb_queue_head_init_raw(struct sk_buff_head *list) +{ + raw_spin_lock_init(&list->raw_lock); + __skb_queue_head_init(list); +} + static inline void skb_queue_head_init_class(struct sk_buff_head *list, struct lock_class_key *class) { Index: linux-4.14.15-rt12/include/linux/smp.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/smp.h +++ linux-4.14.15-rt12/include/linux/smp.h @@ -202,6 +202,9 @@ static inline int get_boot_cpu_id(void) #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) #define put_cpu() preempt_enable() +#define get_cpu_light() ({ migrate_disable(); smp_processor_id(); }) +#define put_cpu_light() migrate_enable() + /* * Callback to arch code if there's nosmp or maxcpus=0 on the * boot command line: Index: linux-4.14.15-rt12/include/linux/spinlock.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/spinlock.h +++ linux-4.14.15-rt12/include/linux/spinlock.h @@ -286,7 +286,11 @@ static inline void do_raw_spin_unlock(ra #define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock)) /* Include rwlock functions */ -#include +#ifdef CONFIG_PREEMPT_RT_FULL +# include +#else +# include +#endif /* * Pull the _spin_*()/_read_*()/_write_*() functions/declarations: @@ -297,6 +301,10 @@ static inline void do_raw_spin_unlock(ra # include #endif +#ifdef CONFIG_PREEMPT_RT_FULL +# include +#else /* PREEMPT_RT_FULL */ + /* * Map the spin_lock functions to the raw variants for PREEMPT_RT=n */ @@ -421,4 +429,6 @@ extern int _atomic_dec_and_lock(atomic_t #define atomic_dec_and_lock(atomic, lock) \ __cond_lock(lock, _atomic_dec_and_lock(atomic, lock)) +#endif /* !PREEMPT_RT_FULL */ + #endif /* __LINUX_SPINLOCK_H */ Index: linux-4.14.15-rt12/include/linux/spinlock_api_smp.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/spinlock_api_smp.h +++ linux-4.14.15-rt12/include/linux/spinlock_api_smp.h @@ -187,6 +187,8 @@ static inline int __raw_spin_trylock_bh( return 0; } -#include +#ifndef CONFIG_PREEMPT_RT_FULL +# include +#endif #endif /* __LINUX_SPINLOCK_API_SMP_H */ Index: linux-4.14.15-rt12/include/linux/spinlock_rt.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/spinlock_rt.h @@ -0,0 +1,159 @@ +#ifndef __LINUX_SPINLOCK_RT_H +#define __LINUX_SPINLOCK_RT_H + +#ifndef __LINUX_SPINLOCK_H +#error Do not include directly. Use spinlock.h +#endif + +#include + +extern void +__rt_spin_lock_init(spinlock_t *lock, const char *name, struct lock_class_key *key); + +#define spin_lock_init(slock) \ +do { \ + static struct lock_class_key __key; \ + \ + rt_mutex_init(&(slock)->lock); \ + __rt_spin_lock_init(slock, #slock, &__key); \ +} while (0) + +extern void __lockfunc rt_spin_lock(spinlock_t *lock); +extern unsigned long __lockfunc rt_spin_lock_trace_flags(spinlock_t *lock); +extern void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass); +extern void __lockfunc rt_spin_unlock(spinlock_t *lock); +extern void __lockfunc rt_spin_unlock_wait(spinlock_t *lock); +extern int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags); +extern int __lockfunc rt_spin_trylock_bh(spinlock_t *lock); +extern int __lockfunc rt_spin_trylock(spinlock_t *lock); +extern int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock); + +/* + * lockdep-less calls, for derived types like rwlock: + * (for trylock they can use rt_mutex_trylock() directly. + * Migrate disable handling must be done at the call site. + */ +extern void __lockfunc __rt_spin_lock(struct rt_mutex *lock); +extern void __lockfunc __rt_spin_trylock(struct rt_mutex *lock); +extern void __lockfunc __rt_spin_unlock(struct rt_mutex *lock); + +#define spin_lock(lock) rt_spin_lock(lock) + +#define spin_lock_bh(lock) \ + do { \ + local_bh_disable(); \ + rt_spin_lock(lock); \ + } while (0) + +#define spin_lock_irq(lock) spin_lock(lock) + +#define spin_do_trylock(lock) __cond_lock(lock, rt_spin_trylock(lock)) + +#define spin_trylock(lock) \ +({ \ + int __locked; \ + __locked = spin_do_trylock(lock); \ + __locked; \ +}) + +#ifdef CONFIG_LOCKDEP +# define spin_lock_nested(lock, subclass) \ + do { \ + rt_spin_lock_nested(lock, subclass); \ + } while (0) + +#define spin_lock_bh_nested(lock, subclass) \ + do { \ + local_bh_disable(); \ + rt_spin_lock_nested(lock, subclass); \ + } while (0) + +# define spin_lock_irqsave_nested(lock, flags, subclass) \ + do { \ + typecheck(unsigned long, flags); \ + flags = 0; \ + rt_spin_lock_nested(lock, subclass); \ + } while (0) +#else +# define spin_lock_nested(lock, subclass) spin_lock(lock) +# define spin_lock_bh_nested(lock, subclass) spin_lock_bh(lock) + +# define spin_lock_irqsave_nested(lock, flags, subclass) \ + do { \ + typecheck(unsigned long, flags); \ + flags = 0; \ + spin_lock(lock); \ + } while (0) +#endif + +#define spin_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + flags = 0; \ + spin_lock(lock); \ + } while (0) + +static inline unsigned long spin_lock_trace_flags(spinlock_t *lock) +{ + unsigned long flags = 0; +#ifdef CONFIG_TRACE_IRQFLAGS + flags = rt_spin_lock_trace_flags(lock); +#else + spin_lock(lock); /* lock_local */ +#endif + return flags; +} + +/* FIXME: we need rt_spin_lock_nest_lock */ +#define spin_lock_nest_lock(lock, nest_lock) spin_lock_nested(lock, 0) + +#define spin_unlock(lock) rt_spin_unlock(lock) + +#define spin_unlock_bh(lock) \ + do { \ + rt_spin_unlock(lock); \ + local_bh_enable(); \ + } while (0) + +#define spin_unlock_irq(lock) spin_unlock(lock) + +#define spin_unlock_irqrestore(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + (void) flags; \ + spin_unlock(lock); \ + } while (0) + +#define spin_trylock_bh(lock) __cond_lock(lock, rt_spin_trylock_bh(lock)) +#define spin_trylock_irq(lock) spin_trylock(lock) + +#define spin_trylock_irqsave(lock, flags) \ + rt_spin_trylock_irqsave(lock, &(flags)) + +#define spin_unlock_wait(lock) rt_spin_unlock_wait(lock) + +#ifdef CONFIG_GENERIC_LOCKBREAK +# define spin_is_contended(lock) ((lock)->break_lock) +#else +# define spin_is_contended(lock) (((void)(lock), 0)) +#endif + +static inline int spin_can_lock(spinlock_t *lock) +{ + return !rt_mutex_is_locked(&lock->lock); +} + +static inline int spin_is_locked(spinlock_t *lock) +{ + return rt_mutex_is_locked(&lock->lock); +} + +static inline void assert_spin_locked(spinlock_t *lock) +{ + BUG_ON(!spin_is_locked(lock)); +} + +#define atomic_dec_and_lock(atomic, lock) \ + atomic_dec_and_spin_lock(atomic, lock) + +#endif Index: linux-4.14.15-rt12/include/linux/spinlock_types.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/spinlock_types.h +++ linux-4.14.15-rt12/include/linux/spinlock_types.h @@ -9,80 +9,15 @@ * Released under the General Public License (GPL). */ -#if defined(CONFIG_SMP) -# include -#else -# include -#endif - -#include - -typedef struct raw_spinlock { - arch_spinlock_t raw_lock; -#ifdef CONFIG_GENERIC_LOCKBREAK - unsigned int break_lock; -#endif -#ifdef CONFIG_DEBUG_SPINLOCK - unsigned int magic, owner_cpu; - void *owner; -#endif -#ifdef CONFIG_DEBUG_LOCK_ALLOC - struct lockdep_map dep_map; -#endif -} raw_spinlock_t; - -#define SPINLOCK_MAGIC 0xdead4ead - -#define SPINLOCK_OWNER_INIT ((void *)-1L) - -#ifdef CONFIG_DEBUG_LOCK_ALLOC -# define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } -#else -# define SPIN_DEP_MAP_INIT(lockname) -#endif +#include -#ifdef CONFIG_DEBUG_SPINLOCK -# define SPIN_DEBUG_INIT(lockname) \ - .magic = SPINLOCK_MAGIC, \ - .owner_cpu = -1, \ - .owner = SPINLOCK_OWNER_INIT, +#ifndef CONFIG_PREEMPT_RT_FULL +# include +# include #else -# define SPIN_DEBUG_INIT(lockname) +# include +# include +# include #endif -#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \ - { \ - .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \ - SPIN_DEBUG_INIT(lockname) \ - SPIN_DEP_MAP_INIT(lockname) } - -#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \ - (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname) - -#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x) - -typedef struct spinlock { - union { - struct raw_spinlock rlock; - -#ifdef CONFIG_DEBUG_LOCK_ALLOC -# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map)) - struct { - u8 __padding[LOCK_PADSIZE]; - struct lockdep_map dep_map; - }; -#endif - }; -} spinlock_t; - -#define __SPIN_LOCK_INITIALIZER(lockname) \ - { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } } - -#define __SPIN_LOCK_UNLOCKED(lockname) \ - (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname) - -#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x) - -#include - #endif /* __LINUX_SPINLOCK_TYPES_H */ Index: linux-4.14.15-rt12/include/linux/spinlock_types_nort.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/spinlock_types_nort.h @@ -0,0 +1,33 @@ +#ifndef __LINUX_SPINLOCK_TYPES_NORT_H +#define __LINUX_SPINLOCK_TYPES_NORT_H + +#ifndef __LINUX_SPINLOCK_TYPES_H +#error "Do not include directly. Include spinlock_types.h instead" +#endif + +/* + * The non RT version maps spinlocks to raw_spinlocks + */ +typedef struct spinlock { + union { + struct raw_spinlock rlock; + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map)) + struct { + u8 __padding[LOCK_PADSIZE]; + struct lockdep_map dep_map; + }; +#endif + }; +} spinlock_t; + +#define __SPIN_LOCK_INITIALIZER(lockname) \ + { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } } + +#define __SPIN_LOCK_UNLOCKED(lockname) \ + (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname) + +#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x) + +#endif Index: linux-4.14.15-rt12/include/linux/spinlock_types_raw.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/spinlock_types_raw.h @@ -0,0 +1,58 @@ +#ifndef __LINUX_SPINLOCK_TYPES_RAW_H +#define __LINUX_SPINLOCK_TYPES_RAW_H + +#include + +#if defined(CONFIG_SMP) +# include +#else +# include +#endif + +#include + +typedef struct raw_spinlock { + arch_spinlock_t raw_lock; +#ifdef CONFIG_GENERIC_LOCKBREAK + unsigned int break_lock; +#endif +#ifdef CONFIG_DEBUG_SPINLOCK + unsigned int magic, owner_cpu; + void *owner; +#endif +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +} raw_spinlock_t; + +#define SPINLOCK_MAGIC 0xdead4ead + +#define SPINLOCK_OWNER_INIT ((void *)-1L) + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define SPIN_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } +#else +# define SPIN_DEP_MAP_INIT(lockname) +#endif + +#ifdef CONFIG_DEBUG_SPINLOCK +# define SPIN_DEBUG_INIT(lockname) \ + .magic = SPINLOCK_MAGIC, \ + .owner_cpu = -1, \ + .owner = SPINLOCK_OWNER_INIT, +#else +# define SPIN_DEBUG_INIT(lockname) +#endif + +#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \ + { \ + .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \ + SPIN_DEBUG_INIT(lockname) \ + SPIN_DEP_MAP_INIT(lockname) } + +#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \ + (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname) + +#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x) + +#endif Index: linux-4.14.15-rt12/include/linux/spinlock_types_rt.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/spinlock_types_rt.h @@ -0,0 +1,48 @@ +#ifndef __LINUX_SPINLOCK_TYPES_RT_H +#define __LINUX_SPINLOCK_TYPES_RT_H + +#ifndef __LINUX_SPINLOCK_TYPES_H +#error "Do not include directly. Include spinlock_types.h instead" +#endif + +#include + +/* + * PREEMPT_RT: spinlocks - an RT mutex plus lock-break field: + */ +typedef struct spinlock { + struct rt_mutex lock; + unsigned int break_lock; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +} spinlock_t; + +#ifdef CONFIG_DEBUG_RT_MUTEXES +# define __RT_SPIN_INITIALIZER(name) \ + { \ + .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \ + .save_state = 1, \ + .file = __FILE__, \ + .line = __LINE__ , \ + } +#else +# define __RT_SPIN_INITIALIZER(name) \ + { \ + .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \ + .save_state = 1, \ + } +#endif + +/* +.wait_list = PLIST_HEAD_INIT_RAW((name).lock.wait_list, (name).lock.wait_lock) +*/ + +#define __SPIN_LOCK_UNLOCKED(name) \ + { .lock = __RT_SPIN_INITIALIZER(name.lock), \ + SPIN_DEP_MAP_INIT(name) } + +#define DEFINE_SPINLOCK(name) \ + spinlock_t name = __SPIN_LOCK_UNLOCKED(name) + +#endif Index: linux-4.14.15-rt12/include/linux/spinlock_types_up.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/spinlock_types_up.h +++ linux-4.14.15-rt12/include/linux/spinlock_types_up.h @@ -1,10 +1,6 @@ #ifndef __LINUX_SPINLOCK_TYPES_UP_H #define __LINUX_SPINLOCK_TYPES_UP_H -#ifndef __LINUX_SPINLOCK_TYPES_H -# error "please don't include this file directly" -#endif - /* * include/linux/spinlock_types_up.h - spinlock type definitions for UP * Index: linux-4.14.15-rt12/include/linux/srcutiny.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/srcutiny.h +++ linux-4.14.15-rt12/include/linux/srcutiny.h @@ -43,7 +43,7 @@ struct srcu_struct { void srcu_drive_gp(struct work_struct *wp); -#define __SRCU_STRUCT_INIT(name) \ +#define __SRCU_STRUCT_INIT(name, __ignored) \ { \ .srcu_wq = __SWAIT_QUEUE_HEAD_INITIALIZER(name.srcu_wq), \ .srcu_cb_tail = &name.srcu_cb_head, \ @@ -56,9 +56,9 @@ void srcu_drive_gp(struct work_struct *w * Tree SRCU, which needs some per-CPU data. */ #define DEFINE_SRCU(name) \ - struct srcu_struct name = __SRCU_STRUCT_INIT(name) + struct srcu_struct name = __SRCU_STRUCT_INIT(name, name) #define DEFINE_STATIC_SRCU(name) \ - static struct srcu_struct name = __SRCU_STRUCT_INIT(name) + static struct srcu_struct name = __SRCU_STRUCT_INIT(name, name) void synchronize_srcu(struct srcu_struct *sp); Index: linux-4.14.15-rt12/include/linux/srcutree.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/srcutree.h +++ linux-4.14.15-rt12/include/linux/srcutree.h @@ -40,7 +40,7 @@ struct srcu_data { unsigned long srcu_unlock_count[2]; /* Unlocks per CPU. */ /* Update-side state. */ - raw_spinlock_t __private lock ____cacheline_internodealigned_in_smp; + spinlock_t __private lock ____cacheline_internodealigned_in_smp; struct rcu_segcblist srcu_cblist; /* List of callbacks.*/ unsigned long srcu_gp_seq_needed; /* Furthest future GP needed. */ unsigned long srcu_gp_seq_needed_exp; /* Furthest future exp GP. */ @@ -58,7 +58,7 @@ struct srcu_data { * Node in SRCU combining tree, similar in function to rcu_data. */ struct srcu_node { - raw_spinlock_t __private lock; + spinlock_t __private lock; unsigned long srcu_have_cbs[4]; /* GP seq for children */ /* having CBs, but only */ /* is > ->srcu_gq_seq. */ @@ -78,7 +78,7 @@ struct srcu_struct { struct srcu_node *level[RCU_NUM_LVLS + 1]; /* First node at each level. */ struct mutex srcu_cb_mutex; /* Serialize CB preparation. */ - raw_spinlock_t __private lock; /* Protect counters */ + spinlock_t __private lock; /* Protect counters */ struct mutex srcu_gp_mutex; /* Serialize GP work. */ unsigned int srcu_idx; /* Current rdr array element. */ unsigned long srcu_gp_seq; /* Grace-period seq #. */ @@ -104,10 +104,10 @@ struct srcu_struct { #define SRCU_STATE_SCAN1 1 #define SRCU_STATE_SCAN2 2 -#define __SRCU_STRUCT_INIT(name) \ +#define __SRCU_STRUCT_INIT(name, pcpu_name) \ { \ - .sda = &name##_srcu_data, \ - .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \ + .sda = &pcpu_name, \ + .lock = __SPIN_LOCK_UNLOCKED(name.lock), \ .srcu_gp_seq_needed = 0 - 1, \ __SRCU_DEP_MAP_INIT(name) \ } @@ -133,7 +133,7 @@ struct srcu_struct { */ #define __DEFINE_SRCU(name, is_static) \ static DEFINE_PER_CPU(struct srcu_data, name##_srcu_data);\ - is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name) + is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name, name##_srcu_data) #define DEFINE_SRCU(name) __DEFINE_SRCU(name, /* not static */) #define DEFINE_STATIC_SRCU(name) __DEFINE_SRCU(name, static) Index: linux-4.14.15-rt12/include/linux/suspend.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/suspend.h +++ linux-4.14.15-rt12/include/linux/suspend.h @@ -196,6 +196,12 @@ struct platform_s2idle_ops { void (*end)(void); }; +#if defined(CONFIG_SUSPEND) || defined(CONFIG_HIBERNATION) +extern bool pm_in_action; +#else +# define pm_in_action false +#endif + #ifdef CONFIG_SUSPEND extern suspend_state_t mem_sleep_current; extern suspend_state_t mem_sleep_default; Index: linux-4.14.15-rt12/include/linux/swait.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/swait.h +++ linux-4.14.15-rt12/include/linux/swait.h @@ -5,6 +5,7 @@ #include #include #include +#include #include /* @@ -147,6 +148,7 @@ static inline bool swq_has_sleeper(struc extern void swake_up(struct swait_queue_head *q); extern void swake_up_all(struct swait_queue_head *q); extern void swake_up_locked(struct swait_queue_head *q); +extern void swake_up_all_locked(struct swait_queue_head *q); extern void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait); extern void prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait, int state); Index: linux-4.14.15-rt12/include/linux/swap.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/swap.h +++ linux-4.14.15-rt12/include/linux/swap.h @@ -12,6 +12,7 @@ #include #include #include +#include #include struct notifier_block; @@ -297,7 +298,8 @@ struct vma_swap_readahead { void *workingset_eviction(struct address_space *mapping, struct page *page); bool workingset_refault(void *shadow); void workingset_activation(struct page *page); -void workingset_update_node(struct radix_tree_node *node, void *private); +void __workingset_update_node(struct radix_tree_node *node, void *private); +DECLARE_LOCAL_IRQ_LOCK(shadow_nodes_lock); /* linux/mm/page_alloc.c */ extern unsigned long totalram_pages; @@ -310,6 +312,7 @@ extern unsigned long nr_free_pagecache_p /* linux/mm/swap.c */ +DECLARE_LOCAL_IRQ_LOCK(swapvec_lock); extern void lru_cache_add(struct page *); extern void lru_cache_add_anon(struct page *page); extern void lru_cache_add_file(struct page *page); Index: linux-4.14.15-rt12/include/linux/swork.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/linux/swork.h @@ -0,0 +1,24 @@ +#ifndef _LINUX_SWORK_H +#define _LINUX_SWORK_H + +#include + +struct swork_event { + struct list_head item; + unsigned long flags; + void (*func)(struct swork_event *); +}; + +static inline void INIT_SWORK(struct swork_event *event, + void (*func)(struct swork_event *)) +{ + event->flags = 0; + event->func = func; +} + +bool swork_queue(struct swork_event *sev); + +int swork_get(void); +void swork_put(void); + +#endif /* _LINUX_SWORK_H */ Index: linux-4.14.15-rt12/include/linux/thread_info.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/thread_info.h +++ linux-4.14.15-rt12/include/linux/thread_info.h @@ -90,7 +90,17 @@ static inline int test_ti_thread_flag(st #define test_thread_flag(flag) \ test_ti_thread_flag(current_thread_info(), flag) -#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) +#ifdef CONFIG_PREEMPT_LAZY +#define tif_need_resched() (test_thread_flag(TIF_NEED_RESCHED) || \ + test_thread_flag(TIF_NEED_RESCHED_LAZY)) +#define tif_need_resched_now() (test_thread_flag(TIF_NEED_RESCHED)) +#define tif_need_resched_lazy() test_thread_flag(TIF_NEED_RESCHED_LAZY)) + +#else +#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) +#define tif_need_resched_now() test_thread_flag(TIF_NEED_RESCHED) +#define tif_need_resched_lazy() 0 +#endif #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES static inline int arch_within_stack_frames(const void * const stack, Index: linux-4.14.15-rt12/include/linux/timer.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/timer.h +++ linux-4.14.15-rt12/include/linux/timer.h @@ -213,7 +213,7 @@ extern void add_timer(struct timer_list extern int try_to_del_timer_sync(struct timer_list *timer); -#ifdef CONFIG_SMP +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL) extern int del_timer_sync(struct timer_list *timer); #else # define del_timer_sync(t) del_timer(t) Index: linux-4.14.15-rt12/include/linux/trace_events.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/trace_events.h +++ linux-4.14.15-rt12/include/linux/trace_events.h @@ -62,6 +62,9 @@ struct trace_entry { unsigned char flags; unsigned char preempt_count; int pid; + unsigned short migrate_disable; + unsigned short padding; + unsigned char preempt_lazy_count; }; #define TRACE_EVENT_TYPE_MAX \ @@ -402,11 +405,13 @@ enum event_trigger_type { extern int filter_match_preds(struct event_filter *filter, void *rec); -extern enum event_trigger_type event_triggers_call(struct trace_event_file *file, - void *rec); -extern void event_triggers_post_call(struct trace_event_file *file, - enum event_trigger_type tt, - void *rec); +extern enum event_trigger_type +event_triggers_call(struct trace_event_file *file, void *rec, + struct ring_buffer_event *event); +extern void +event_triggers_post_call(struct trace_event_file *file, + enum event_trigger_type tt, + void *rec, struct ring_buffer_event *event); bool trace_event_ignore_this_pid(struct trace_event_file *trace_file); @@ -426,7 +431,7 @@ trace_trigger_soft_disabled(struct trace if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) { if (eflags & EVENT_FILE_FL_TRIGGER_MODE) - event_triggers_call(file, NULL); + event_triggers_call(file, NULL, NULL); if (eflags & EVENT_FILE_FL_SOFT_DISABLED) return true; if (eflags & EVENT_FILE_FL_PID_FILTER) Index: linux-4.14.15-rt12/include/linux/uaccess.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/uaccess.h +++ linux-4.14.15-rt12/include/linux/uaccess.h @@ -185,6 +185,7 @@ static __always_inline void pagefault_di */ static inline void pagefault_disable(void) { + migrate_disable(); pagefault_disabled_inc(); /* * make sure to have issued the store before a pagefault @@ -201,6 +202,7 @@ static inline void pagefault_enable(void */ barrier(); pagefault_disabled_dec(); + migrate_enable(); } /* Index: linux-4.14.15-rt12/include/linux/vmstat.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/vmstat.h +++ linux-4.14.15-rt12/include/linux/vmstat.h @@ -33,7 +33,9 @@ DECLARE_PER_CPU(struct vm_event_state, v */ static inline void __count_vm_event(enum vm_event_item item) { + preempt_disable_rt(); raw_cpu_inc(vm_event_states.event[item]); + preempt_enable_rt(); } static inline void count_vm_event(enum vm_event_item item) @@ -43,7 +45,9 @@ static inline void count_vm_event(enum v static inline void __count_vm_events(enum vm_event_item item, long delta) { + preempt_disable_rt(); raw_cpu_add(vm_event_states.event[item], delta); + preempt_enable_rt(); } static inline void count_vm_events(enum vm_event_item item, long delta) Index: linux-4.14.15-rt12/include/linux/wait.h =================================================================== --- linux-4.14.15-rt12.orig/include/linux/wait.h +++ linux-4.14.15-rt12/include/linux/wait.h @@ -10,6 +10,7 @@ #include #include +#include typedef struct wait_queue_entry wait_queue_entry_t; @@ -486,8 +487,8 @@ do { \ int __ret = 0; \ struct hrtimer_sleeper __t; \ \ - hrtimer_init_on_stack(&__t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); \ - hrtimer_init_sleeper(&__t, current); \ + hrtimer_init_sleeper_on_stack(&__t, CLOCK_MONOTONIC, HRTIMER_MODE_REL, \ + current); \ if ((timeout) != KTIME_MAX) \ hrtimer_start_range_ns(&__t.timer, timeout, \ current->timer_slack_ns, \ Index: linux-4.14.15-rt12/include/net/gen_stats.h =================================================================== --- linux-4.14.15-rt12.orig/include/net/gen_stats.h +++ linux-4.14.15-rt12/include/net/gen_stats.h @@ -6,6 +6,7 @@ #include #include #include +#include struct gnet_stats_basic_cpu { struct gnet_stats_basic_packed bstats; @@ -36,11 +37,11 @@ int gnet_stats_start_copy_compat(struct spinlock_t *lock, struct gnet_dump *d, int padattr); -int gnet_stats_copy_basic(const seqcount_t *running, +int gnet_stats_copy_basic(net_seqlock_t *running, struct gnet_dump *d, struct gnet_stats_basic_cpu __percpu *cpu, struct gnet_stats_basic_packed *b); -void __gnet_stats_copy_basic(const seqcount_t *running, +void __gnet_stats_copy_basic(net_seqlock_t *running, struct gnet_stats_basic_packed *bstats, struct gnet_stats_basic_cpu __percpu *cpu, struct gnet_stats_basic_packed *b); @@ -57,13 +58,13 @@ int gen_new_estimator(struct gnet_stats_ struct gnet_stats_basic_cpu __percpu *cpu_bstats, struct net_rate_estimator __rcu **rate_est, spinlock_t *stats_lock, - seqcount_t *running, struct nlattr *opt); + net_seqlock_t *running, struct nlattr *opt); void gen_kill_estimator(struct net_rate_estimator __rcu **ptr); int gen_replace_estimator(struct gnet_stats_basic_packed *bstats, struct gnet_stats_basic_cpu __percpu *cpu_bstats, struct net_rate_estimator __rcu **ptr, spinlock_t *stats_lock, - seqcount_t *running, struct nlattr *opt); + net_seqlock_t *running, struct nlattr *opt); bool gen_estimator_active(struct net_rate_estimator __rcu **ptr); bool gen_estimator_read(struct net_rate_estimator __rcu **ptr, struct gnet_stats_rate_est64 *sample); Index: linux-4.14.15-rt12/include/net/neighbour.h =================================================================== --- linux-4.14.15-rt12.orig/include/net/neighbour.h +++ linux-4.14.15-rt12/include/net/neighbour.h @@ -450,7 +450,7 @@ static inline int neigh_hh_bridge(struct } #endif -static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb) +static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb) { unsigned int seq; unsigned int hh_len; @@ -474,7 +474,7 @@ static inline int neigh_hh_output(const static inline int neigh_output(struct neighbour *n, struct sk_buff *skb) { - const struct hh_cache *hh = &n->hh; + struct hh_cache *hh = &n->hh; if ((n->nud_state & NUD_CONNECTED) && hh->hh_len) return neigh_hh_output(hh, skb); @@ -515,7 +515,7 @@ struct neighbour_cb { #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) -static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n, +static inline void neigh_ha_snapshot(char *dst, struct neighbour *n, const struct net_device *dev) { unsigned int seq; Index: linux-4.14.15-rt12/include/net/net_seq_lock.h =================================================================== --- /dev/null +++ linux-4.14.15-rt12/include/net/net_seq_lock.h @@ -0,0 +1,15 @@ +#ifndef __NET_NET_SEQ_LOCK_H__ +#define __NET_NET_SEQ_LOCK_H__ + +#ifdef CONFIG_PREEMPT_RT_BASE +# define net_seqlock_t seqlock_t +# define net_seq_begin(__r) read_seqbegin(__r) +# define net_seq_retry(__r, __s) read_seqretry(__r, __s) + +#else +# define net_seqlock_t seqcount_t +# define net_seq_begin(__r) read_seqcount_begin(__r) +# define net_seq_retry(__r, __s) read_seqcount_retry(__r, __s) +#endif + +#endif Index: linux-4.14.15-rt12/include/net/sch_generic.h =================================================================== --- linux-4.14.15-rt12.orig/include/net/sch_generic.h +++ linux-4.14.15-rt12/include/net/sch_generic.h @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -90,7 +91,7 @@ struct Qdisc { struct sk_buff *gso_skb ____cacheline_aligned_in_smp; struct qdisc_skb_head q; struct gnet_stats_basic_packed bstats; - seqcount_t running; + net_seqlock_t running; struct gnet_stats_queue qstats; unsigned long state; struct Qdisc *next_sched; @@ -109,13 +110,22 @@ static inline void qdisc_refcount_inc(st refcount_inc(&qdisc->refcnt); } -static inline bool qdisc_is_running(const struct Qdisc *qdisc) +static inline bool qdisc_is_running(struct Qdisc *qdisc) { +#ifdef CONFIG_PREEMPT_RT_BASE + return spin_is_locked(&qdisc->running.lock) ? true : false; +#else return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; +#endif } static inline bool qdisc_run_begin(struct Qdisc *qdisc) { +#ifdef CONFIG_PREEMPT_RT_BASE + if (try_write_seqlock(&qdisc->running)) + return true; + return false; +#else if (qdisc_is_running(qdisc)) return false; /* Variant of write_seqcount_begin() telling lockdep a trylock @@ -124,11 +134,16 @@ static inline bool qdisc_run_begin(struc raw_write_seqcount_begin(&qdisc->running); seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); return true; +#endif } static inline void qdisc_run_end(struct Qdisc *qdisc) { +#ifdef CONFIG_PREEMPT_RT_BASE + write_sequnlock(&qdisc->running); +#else write_seqcount_end(&qdisc->running); +#endif } static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) @@ -337,7 +352,7 @@ static inline spinlock_t *qdisc_root_sle return qdisc_lock(root); } -static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) +static inline net_seqlock_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) { struct Qdisc *root = qdisc_root_sleeping(qdisc); Index: linux-4.14.15-rt12/include/net/xfrm.h =================================================================== --- linux-4.14.15-rt12.orig/include/net/xfrm.h +++ linux-4.14.15-rt12/include/net/xfrm.h @@ -217,7 +217,7 @@ struct xfrm_state { struct xfrm_stats stats; struct xfrm_lifetime_cur curlft; - struct tasklet_hrtimer mtimer; + struct hrtimer mtimer; struct xfrm_state_offload xso; Index: linux-4.14.15-rt12/include/trace/events/timer.h =================================================================== --- linux-4.14.15-rt12.orig/include/trace/events/timer.h +++ linux-4.14.15-rt12/include/trace/events/timer.h @@ -136,6 +136,24 @@ DEFINE_EVENT(timer_class, timer_cancel, TP_ARGS(timer) ); +#define decode_clockid(type) \ + __print_symbolic(type, \ + { CLOCK_REALTIME, "CLOCK_REALTIME" }, \ + { CLOCK_MONOTONIC, "CLOCK_MONOTONIC" }, \ + { CLOCK_BOOTTIME, "CLOCK_BOOTTIME" }, \ + { CLOCK_TAI, "CLOCK_TAI" }) + +#define decode_hrtimer_mode(mode) \ + __print_symbolic(mode, \ + { HRTIMER_MODE_ABS, "ABS" }, \ + { HRTIMER_MODE_REL, "REL" }, \ + { HRTIMER_MODE_ABS_PINNED, "ABS|PINNED" }, \ + { HRTIMER_MODE_REL_PINNED, "REL|PINNED" }, \ + { HRTIMER_MODE_ABS_SOFT, "ABS|SOFT" }, \ + { HRTIMER_MODE_REL_SOFT, "REL|SOFT" }, \ + { HRTIMER_MODE_ABS_PINNED_SOFT, "ABS|PINNED|SOFT" }, \ + { HRTIMER_MODE_REL_PINNED_SOFT, "REL|PINNED|SOFT" }) + /** * hrtimer_init - called when the hrtimer is initialized * @hrtimer: pointer to struct hrtimer @@ -162,10 +180,8 @@ TRACE_EVENT(hrtimer_init, ), TP_printk("hrtimer=%p clockid=%s mode=%s", __entry->hrtimer, - __entry->clockid == CLOCK_REALTIME ? - "CLOCK_REALTIME" : "CLOCK_MONOTONIC", - __entry->mode == HRTIMER_MODE_ABS ? - "HRTIMER_MODE_ABS" : "HRTIMER_MODE_REL") + decode_clockid(__entry->clockid), + decode_hrtimer_mode(__entry->mode)) ); /** @@ -174,15 +190,16 @@ TRACE_EVENT(hrtimer_init, */ TRACE_EVENT(hrtimer_start, - TP_PROTO(struct hrtimer *hrtimer), + TP_PROTO(struct hrtimer *hrtimer, enum hrtimer_mode mode), - TP_ARGS(hrtimer), + TP_ARGS(hrtimer, mode), TP_STRUCT__entry( __field( void *, hrtimer ) __field( void *, function ) __field( s64, expires ) __field( s64, softexpires ) + __field( enum hrtimer_mode, mode ) ), TP_fast_assign( @@ -190,12 +207,14 @@ TRACE_EVENT(hrtimer_start, __entry->function = hrtimer->function; __entry->expires = hrtimer_get_expires(hrtimer); __entry->softexpires = hrtimer_get_softexpires(hrtimer); + __entry->mode = mode; ), - TP_printk("hrtimer=%p function=%pf expires=%llu softexpires=%llu", - __entry->hrtimer, __entry->function, + TP_printk("hrtimer=%p function=%pf expires=%llu softexpires=%llu " + "mode=%s", __entry->hrtimer, __entry->function, (unsigned long long) __entry->expires, - (unsigned long long) __entry->softexpires) + (unsigned long long) __entry->softexpires, + decode_hrtimer_mode(__entry->mode)) ); /** Index: linux-4.14.15-rt12/init/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/init/Kconfig +++ linux-4.14.15-rt12/init/Kconfig @@ -744,6 +744,7 @@ config CFS_BANDWIDTH config RT_GROUP_SCHED bool "Group scheduling for SCHED_RR/FIFO" depends on CGROUP_SCHED + depends on !PREEMPT_RT_FULL default n help This feature lets you explicitly allocate real CPU bandwidth @@ -1533,6 +1534,7 @@ choice config SLAB bool "SLAB" + depends on !PREEMPT_RT_FULL select HAVE_HARDENED_USERCOPY_ALLOCATOR help The regular slab allocator that is established and known to work @@ -1553,6 +1555,7 @@ config SLUB config SLOB depends on EXPERT bool "SLOB (Simple Allocator)" + depends on !PREEMPT_RT_FULL help SLOB replaces the stock allocator with a drastically simpler allocator. SLOB is generally more space efficient but @@ -1594,7 +1597,7 @@ config SLAB_FREELIST_HARDENED config SLUB_CPU_PARTIAL default y - depends on SLUB && SMP + depends on SLUB && SMP && !PREEMPT_RT_FULL bool "SLUB per cpu partial cache" help Per cpu partial caches accellerate objects allocation and freeing Index: linux-4.14.15-rt12/init/Makefile =================================================================== --- linux-4.14.15-rt12.orig/init/Makefile +++ linux-4.14.15-rt12/init/Makefile @@ -36,4 +36,4 @@ silent_chk_compile.h = : include/generated/compile.h: FORCE @$($(quiet)chk_compile.h) $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \ - "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)" + "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CONFIG_PREEMPT_RT_FULL)" "$(CC) $(KBUILD_CFLAGS)" Index: linux-4.14.15-rt12/init/main.c =================================================================== --- linux-4.14.15-rt12.orig/init/main.c +++ linux-4.14.15-rt12/init/main.c @@ -543,6 +543,7 @@ asmlinkage __visible void __init start_k setup_command_line(command_line); setup_nr_cpu_ids(); setup_per_cpu_areas(); + softirq_early_init(); boot_cpu_state_init(); smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ Index: linux-4.14.15-rt12/kernel/Kconfig.locks =================================================================== --- linux-4.14.15-rt12.orig/kernel/Kconfig.locks +++ linux-4.14.15-rt12/kernel/Kconfig.locks @@ -225,11 +225,11 @@ config ARCH_SUPPORTS_ATOMIC_RMW config MUTEX_SPIN_ON_OWNER def_bool y - depends on SMP && ARCH_SUPPORTS_ATOMIC_RMW + depends on SMP && ARCH_SUPPORTS_ATOMIC_RMW && !PREEMPT_RT_FULL config RWSEM_SPIN_ON_OWNER def_bool y - depends on SMP && RWSEM_XCHGADD_ALGORITHM && ARCH_SUPPORTS_ATOMIC_RMW + depends on SMP && RWSEM_XCHGADD_ALGORITHM && ARCH_SUPPORTS_ATOMIC_RMW && !PREEMPT_RT_FULL config LOCK_SPIN_ON_OWNER def_bool y Index: linux-4.14.15-rt12/kernel/Kconfig.preempt =================================================================== --- linux-4.14.15-rt12.orig/kernel/Kconfig.preempt +++ linux-4.14.15-rt12/kernel/Kconfig.preempt @@ -1,3 +1,16 @@ +config PREEMPT + bool + select PREEMPT_COUNT + +config PREEMPT_RT_BASE + bool + select PREEMPT + +config HAVE_PREEMPT_LAZY + bool + +config PREEMPT_LAZY + def_bool y if HAVE_PREEMPT_LAZY && PREEMPT_RT_FULL choice prompt "Preemption Model" @@ -33,9 +46,9 @@ config PREEMPT_VOLUNTARY Select this if you are building a kernel for a desktop system. -config PREEMPT +config PREEMPT__LL bool "Preemptible Kernel (Low-Latency Desktop)" - select PREEMPT_COUNT + select PREEMPT select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK help This option reduces the latency of the kernel by making @@ -52,6 +65,22 @@ config PREEMPT embedded system with latency requirements in the milliseconds range. +config PREEMPT_RTB + bool "Preemptible Kernel (Basic RT)" + select PREEMPT_RT_BASE + help + This option is basically the same as (Low-Latency Desktop) but + enables changes which are preliminary for the full preemptible + RT kernel. + +config PREEMPT_RT_FULL + bool "Fully Preemptible Kernel (RT)" + depends on IRQ_FORCED_THREADING + select PREEMPT_RT_BASE + select PREEMPT_RCU + help + All and everything + endchoice config PREEMPT_COUNT Index: linux-4.14.15-rt12/kernel/cgroup/cgroup.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/cgroup/cgroup.c +++ linux-4.14.15-rt12/kernel/cgroup/cgroup.c @@ -4498,10 +4498,10 @@ static void css_free_rcu_fn(struct rcu_h queue_work(cgroup_destroy_wq, &css->destroy_work); } -static void css_release_work_fn(struct work_struct *work) +static void css_release_work_fn(struct swork_event *sev) { struct cgroup_subsys_state *css = - container_of(work, struct cgroup_subsys_state, destroy_work); + container_of(sev, struct cgroup_subsys_state, destroy_swork); struct cgroup_subsys *ss = css->ss; struct cgroup *cgrp = css->cgroup; @@ -4552,8 +4552,8 @@ static void css_release(struct percpu_re struct cgroup_subsys_state *css = container_of(ref, struct cgroup_subsys_state, refcnt); - INIT_WORK(&css->destroy_work, css_release_work_fn); - queue_work(cgroup_destroy_wq, &css->destroy_work); + INIT_SWORK(&css->destroy_swork, css_release_work_fn); + swork_queue(&css->destroy_swork); } static void init_and_link_css(struct cgroup_subsys_state *css, @@ -5259,6 +5259,7 @@ static int __init cgroup_wq_init(void) */ cgroup_destroy_wq = alloc_workqueue("cgroup_destroy", 0, 1); BUG_ON(!cgroup_destroy_wq); + BUG_ON(swork_get()); return 0; } core_initcall(cgroup_wq_init); Index: linux-4.14.15-rt12/kernel/cgroup/cpuset.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/cgroup/cpuset.c +++ linux-4.14.15-rt12/kernel/cgroup/cpuset.c @@ -288,7 +288,7 @@ static struct cpuset top_cpuset = { */ static DEFINE_MUTEX(cpuset_mutex); -static DEFINE_SPINLOCK(callback_lock); +static DEFINE_RAW_SPINLOCK(callback_lock); static struct workqueue_struct *cpuset_migrate_mm_wq; @@ -926,9 +926,9 @@ static void update_cpumasks_hier(struct continue; rcu_read_unlock(); - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); cpumask_copy(cp->effective_cpus, new_cpus); - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); WARN_ON(!is_in_v2_mode() && !cpumask_equal(cp->cpus_allowed, cp->effective_cpus)); @@ -993,9 +993,9 @@ static int update_cpumask(struct cpuset if (retval < 0) return retval; - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); cpumask_copy(cs->cpus_allowed, trialcs->cpus_allowed); - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); /* use trialcs->cpus_allowed as a temp variable */ update_cpumasks_hier(cs, trialcs->cpus_allowed); @@ -1179,9 +1179,9 @@ static void update_nodemasks_hier(struct continue; rcu_read_unlock(); - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); cp->effective_mems = *new_mems; - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); WARN_ON(!is_in_v2_mode() && !nodes_equal(cp->mems_allowed, cp->effective_mems)); @@ -1249,9 +1249,9 @@ static int update_nodemask(struct cpuset if (retval < 0) goto done; - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); cs->mems_allowed = trialcs->mems_allowed; - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); /* use trialcs->mems_allowed as a temp variable */ update_nodemasks_hier(cs, &trialcs->mems_allowed); @@ -1342,9 +1342,9 @@ static int update_flag(cpuset_flagbits_t spread_flag_changed = ((is_spread_slab(cs) != is_spread_slab(trialcs)) || (is_spread_page(cs) != is_spread_page(trialcs))); - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); cs->flags = trialcs->flags; - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); if (!cpumask_empty(trialcs->cpus_allowed) && balance_flag_changed) rebuild_sched_domains_locked(); @@ -1759,7 +1759,7 @@ static int cpuset_common_seq_show(struct cpuset_filetype_t type = seq_cft(sf)->private; int ret = 0; - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); switch (type) { case FILE_CPULIST: @@ -1778,7 +1778,7 @@ static int cpuset_common_seq_show(struct ret = -EINVAL; } - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); return ret; } @@ -1993,12 +1993,12 @@ static int cpuset_css_online(struct cgro cpuset_inc(); - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); if (is_in_v2_mode()) { cpumask_copy(cs->effective_cpus, parent->effective_cpus); cs->effective_mems = parent->effective_mems; } - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); if (!test_bit(CGRP_CPUSET_CLONE_CHILDREN, &css->cgroup->flags)) goto out_unlock; @@ -2025,12 +2025,12 @@ static int cpuset_css_online(struct cgro } rcu_read_unlock(); - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); cs->mems_allowed = parent->mems_allowed; cs->effective_mems = parent->mems_allowed; cpumask_copy(cs->cpus_allowed, parent->cpus_allowed); cpumask_copy(cs->effective_cpus, parent->cpus_allowed); - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); out_unlock: mutex_unlock(&cpuset_mutex); return 0; @@ -2069,7 +2069,7 @@ static void cpuset_css_free(struct cgrou static void cpuset_bind(struct cgroup_subsys_state *root_css) { mutex_lock(&cpuset_mutex); - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); if (is_in_v2_mode()) { cpumask_copy(top_cpuset.cpus_allowed, cpu_possible_mask); @@ -2080,7 +2080,7 @@ static void cpuset_bind(struct cgroup_su top_cpuset.mems_allowed = top_cpuset.effective_mems; } - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); mutex_unlock(&cpuset_mutex); } @@ -2094,7 +2094,7 @@ static void cpuset_fork(struct task_stru if (task_css_is_root(task, cpuset_cgrp_id)) return; - set_cpus_allowed_ptr(task, ¤t->cpus_allowed); + set_cpus_allowed_ptr(task, current->cpus_ptr); task->mems_allowed = current->mems_allowed; } @@ -2178,12 +2178,12 @@ hotplug_update_tasks_legacy(struct cpuse { bool is_empty; - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); cpumask_copy(cs->cpus_allowed, new_cpus); cpumask_copy(cs->effective_cpus, new_cpus); cs->mems_allowed = *new_mems; cs->effective_mems = *new_mems; - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); /* * Don't call update_tasks_cpumask() if the cpuset becomes empty, @@ -2220,10 +2220,10 @@ hotplug_update_tasks(struct cpuset *cs, if (nodes_empty(*new_mems)) *new_mems = parent_cs(cs)->effective_mems; - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); cpumask_copy(cs->effective_cpus, new_cpus); cs->effective_mems = *new_mems; - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); if (cpus_updated) update_tasks_cpumask(cs); @@ -2316,21 +2316,21 @@ static void cpuset_hotplug_workfn(struct /* synchronize cpus_allowed to cpu_active_mask */ if (cpus_updated) { - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); if (!on_dfl) cpumask_copy(top_cpuset.cpus_allowed, &new_cpus); cpumask_copy(top_cpuset.effective_cpus, &new_cpus); - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); /* we don't mess with cpumasks of tasks in top_cpuset */ } /* synchronize mems_allowed to N_MEMORY */ if (mems_updated) { - spin_lock_irq(&callback_lock); + raw_spin_lock_irq(&callback_lock); if (!on_dfl) top_cpuset.mems_allowed = new_mems; top_cpuset.effective_mems = new_mems; - spin_unlock_irq(&callback_lock); + raw_spin_unlock_irq(&callback_lock); update_tasks_nodemask(&top_cpuset); } @@ -2429,11 +2429,11 @@ void cpuset_cpus_allowed(struct task_str { unsigned long flags; - spin_lock_irqsave(&callback_lock, flags); + raw_spin_lock_irqsave(&callback_lock, flags); rcu_read_lock(); guarantee_online_cpus(task_cs(tsk), pmask); rcu_read_unlock(); - spin_unlock_irqrestore(&callback_lock, flags); + raw_spin_unlock_irqrestore(&callback_lock, flags); } void cpuset_cpus_allowed_fallback(struct task_struct *tsk) @@ -2481,11 +2481,11 @@ nodemask_t cpuset_mems_allowed(struct ta nodemask_t mask; unsigned long flags; - spin_lock_irqsave(&callback_lock, flags); + raw_spin_lock_irqsave(&callback_lock, flags); rcu_read_lock(); guarantee_online_mems(task_cs(tsk), &mask); rcu_read_unlock(); - spin_unlock_irqrestore(&callback_lock, flags); + raw_spin_unlock_irqrestore(&callback_lock, flags); return mask; } @@ -2577,14 +2577,14 @@ bool __cpuset_node_allowed(int node, gfp return true; /* Not hardwall and node outside mems_allowed: scan up cpusets */ - spin_lock_irqsave(&callback_lock, flags); + raw_spin_lock_irqsave(&callback_lock, flags); rcu_read_lock(); cs = nearest_hardwall_ancestor(task_cs(current)); allowed = node_isset(node, cs->mems_allowed); rcu_read_unlock(); - spin_unlock_irqrestore(&callback_lock, flags); + raw_spin_unlock_irqrestore(&callback_lock, flags); return allowed; } Index: linux-4.14.15-rt12/kernel/cpu.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/cpu.c +++ linux-4.14.15-rt12/kernel/cpu.c @@ -73,6 +73,11 @@ static DEFINE_PER_CPU(struct cpuhp_cpu_s .fail = CPUHP_INVALID, }; +#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PREEMPT_RT_FULL) +static DEFINE_PER_CPU(struct rt_rw_lock, cpuhp_pin_lock) = \ + __RWLOCK_RT_INITIALIZER(cpuhp_pin_lock); +#endif + #if defined(CONFIG_LOCKDEP) && defined(CONFIG_SMP) static struct lockdep_map cpuhp_state_up_map = STATIC_LOCKDEP_MAP_INIT("cpuhp_state-up", &cpuhp_state_up_map); @@ -286,6 +291,55 @@ static int cpu_hotplug_disabled; #ifdef CONFIG_HOTPLUG_CPU +/** + * pin_current_cpu - Prevent the current cpu from being unplugged + */ +void pin_current_cpu(void) +{ +#ifdef CONFIG_PREEMPT_RT_FULL + struct rt_rw_lock *cpuhp_pin; + unsigned int cpu; + int ret; + +again: + cpuhp_pin = this_cpu_ptr(&cpuhp_pin_lock); + ret = __read_rt_trylock(cpuhp_pin); + if (ret) { + current->pinned_on_cpu = smp_processor_id(); + return; + } + cpu = smp_processor_id(); + preempt_lazy_enable(); + preempt_enable(); + + __read_rt_lock(cpuhp_pin); + + preempt_disable(); + preempt_lazy_disable(); + if (cpu != smp_processor_id()) { + __read_rt_unlock(cpuhp_pin); + goto again; + } + current->pinned_on_cpu = cpu; +#endif +} + +/** + * unpin_current_cpu - Allow unplug of current cpu + */ +void unpin_current_cpu(void) +{ +#ifdef CONFIG_PREEMPT_RT_FULL + struct rt_rw_lock *cpuhp_pin = this_cpu_ptr(&cpuhp_pin_lock); + + if (WARN_ON(current->pinned_on_cpu != smp_processor_id())) + cpuhp_pin = per_cpu_ptr(&cpuhp_pin_lock, current->pinned_on_cpu); + + current->pinned_on_cpu = -1; + __read_rt_unlock(cpuhp_pin); +#endif +} + DEFINE_STATIC_PERCPU_RWSEM(cpu_hotplug_lock); void cpus_read_lock(void) @@ -753,6 +807,9 @@ static int take_cpu_down(void *_param) static int takedown_cpu(unsigned int cpu) { +#ifdef CONFIG_PREEMPT_RT_FULL + struct rt_rw_lock *cpuhp_pin = per_cpu_ptr(&cpuhp_pin_lock, cpu); +#endif struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); int err; @@ -766,11 +823,18 @@ static int takedown_cpu(unsigned int cpu */ irq_lock_sparse(); +#ifdef CONFIG_PREEMPT_RT_FULL + __write_rt_lock(cpuhp_pin); +#endif + /* * So now all preempt/rcu users must observe !cpu_active(). */ err = stop_machine_cpuslocked(take_cpu_down, NULL, cpumask_of(cpu)); if (err) { +#ifdef CONFIG_PREEMPT_RT_FULL + __write_rt_unlock(cpuhp_pin); +#endif /* CPU refused to die */ irq_unlock_sparse(); /* Unpark the hotplug thread so we can rollback there */ @@ -789,6 +853,9 @@ static int takedown_cpu(unsigned int cpu wait_for_ap_thread(st, false); BUG_ON(st->state != CPUHP_AP_IDLE_DEAD); +#ifdef CONFIG_PREEMPT_RT_FULL + __write_rt_unlock(cpuhp_pin); +#endif /* Interrupts are moved away from the dying cpu, reenable alloc/free */ irq_unlock_sparse(); Index: linux-4.14.15-rt12/kernel/debug/kdb/kdb_io.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/debug/kdb/kdb_io.c +++ linux-4.14.15-rt12/kernel/debug/kdb/kdb_io.c @@ -854,9 +854,11 @@ int kdb_printf(const char *fmt, ...) va_list ap; int r; + kdb_trap_printk++; va_start(ap, fmt); r = vkdb_printf(KDB_MSGSRC_INTERNAL, fmt, ap); va_end(ap); + kdb_trap_printk--; return r; } Index: linux-4.14.15-rt12/kernel/delayacct.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/delayacct.c +++ linux-4.14.15-rt12/kernel/delayacct.c @@ -44,23 +44,23 @@ void __delayacct_tsk_init(struct task_st { tsk->delays = kmem_cache_zalloc(delayacct_cache, GFP_KERNEL); if (tsk->delays) - spin_lock_init(&tsk->delays->lock); + raw_spin_lock_init(&tsk->delays->lock); } /* * Finish delay accounting for a statistic using its timestamps (@start), * accumalator (@total) and @count */ -static void delayacct_end(spinlock_t *lock, u64 *start, u64 *total, u32 *count) +static void delayacct_end(raw_spinlock_t *lock, u64 *start, u64 *total, u32 *count) { s64 ns = ktime_get_ns() - *start; unsigned long flags; if (ns > 0) { - spin_lock_irqsave(lock, flags); + raw_spin_lock_irqsave(lock, flags); *total += ns; (*count)++; - spin_unlock_irqrestore(lock, flags); + raw_spin_unlock_irqrestore(lock, flags); } } @@ -127,7 +127,7 @@ int __delayacct_add_tsk(struct taskstats /* zero XXX_total, non-zero XXX_count implies XXX stat overflowed */ - spin_lock_irqsave(&tsk->delays->lock, flags); + raw_spin_lock_irqsave(&tsk->delays->lock, flags); tmp = d->blkio_delay_total + tsk->delays->blkio_delay; d->blkio_delay_total = (tmp < d->blkio_delay_total) ? 0 : tmp; tmp = d->swapin_delay_total + tsk->delays->swapin_delay; @@ -137,7 +137,7 @@ int __delayacct_add_tsk(struct taskstats d->blkio_count += tsk->delays->blkio_count; d->swapin_count += tsk->delays->swapin_count; d->freepages_count += tsk->delays->freepages_count; - spin_unlock_irqrestore(&tsk->delays->lock, flags); + raw_spin_unlock_irqrestore(&tsk->delays->lock, flags); return 0; } @@ -147,10 +147,10 @@ __u64 __delayacct_blkio_ticks(struct tas __u64 ret; unsigned long flags; - spin_lock_irqsave(&tsk->delays->lock, flags); + raw_spin_lock_irqsave(&tsk->delays->lock, flags); ret = nsec_to_clock_t(tsk->delays->blkio_delay + tsk->delays->swapin_delay); - spin_unlock_irqrestore(&tsk->delays->lock, flags); + raw_spin_unlock_irqrestore(&tsk->delays->lock, flags); return ret; } Index: linux-4.14.15-rt12/kernel/events/core.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/events/core.c +++ linux-4.14.15-rt12/kernel/events/core.c @@ -1042,7 +1042,7 @@ static void __perf_mux_hrtimer_init(stru cpuctx->hrtimer_interval = ns_to_ktime(NSEC_PER_MSEC * interval); raw_spin_lock_init(&cpuctx->hrtimer_lock); - hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); + hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED_HARD); timer->function = perf_mux_hrtimer_handler; } @@ -8709,7 +8709,7 @@ static void perf_swevent_init_hrtimer(st if (!is_sampling_event(event)) return; - hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD); hwc->hrtimer.function = perf_swevent_hrtimer; /* Index: linux-4.14.15-rt12/kernel/exit.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/exit.c +++ linux-4.14.15-rt12/kernel/exit.c @@ -159,7 +159,7 @@ static void __exit_signal(struct task_st * Do this under ->siglock, we can race with another thread * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals. */ - flush_sigqueue(&tsk->pending); + flush_task_sigqueue(tsk); tsk->sighand = NULL; spin_unlock(&sighand->siglock); Index: linux-4.14.15-rt12/kernel/fork.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/fork.c +++ linux-4.14.15-rt12/kernel/fork.c @@ -40,6 +40,7 @@ #include #include #include +#include #include #include #include @@ -408,13 +409,24 @@ static inline void put_signal_struct(str if (atomic_dec_and_test(&sig->sigcnt)) free_signal_struct(sig); } - +#ifdef CONFIG_PREEMPT_RT_BASE +static +#endif void __put_task_struct(struct task_struct *tsk) { WARN_ON(!tsk->exit_state); WARN_ON(atomic_read(&tsk->usage)); WARN_ON(tsk == current); + /* + * Remove function-return probe instances associated with this + * task and put them back on the free list. + */ + kprobe_flush_task(tsk); + + /* Task is done with its stack. */ + put_task_stack(tsk); + cgroup_free(tsk); task_numa_free(tsk); security_task_free(tsk); @@ -425,7 +437,18 @@ void __put_task_struct(struct task_struc if (!profile_handoff_task(tsk)) free_task(tsk); } +#ifndef CONFIG_PREEMPT_RT_BASE EXPORT_SYMBOL_GPL(__put_task_struct); +#else +void __put_task_struct_cb(struct rcu_head *rhp) +{ + struct task_struct *tsk = container_of(rhp, struct task_struct, put_rcu); + + __put_task_struct(tsk); + +} +EXPORT_SYMBOL_GPL(__put_task_struct_cb); +#endif void __init __weak arch_task_cache_init(void) { } @@ -564,7 +587,8 @@ static struct task_struct *dup_task_stru #ifdef CONFIG_CC_STACKPROTECTOR tsk->stack_canary = get_random_canary(); #endif - + if (orig->cpus_ptr == &orig->cpus_mask) + tsk->cpus_ptr = &tsk->cpus_mask; /* * One for us, one for whoever does the "release_task()" (usually * parent) @@ -576,6 +600,7 @@ static struct task_struct *dup_task_stru tsk->splice_pipe = NULL; tsk->task_frag.page = NULL; tsk->wake_q.next = NULL; + tsk->wake_q_sleeper.next = NULL; account_kernel_stack(tsk, 1); @@ -916,6 +941,19 @@ void __mmdrop(struct mm_struct *mm) } EXPORT_SYMBOL_GPL(__mmdrop); +#ifdef CONFIG_PREEMPT_RT_BASE +/* + * RCU callback for delayed mm drop. Not strictly rcu, but we don't + * want another facility to make this work. + */ +void __mmdrop_delayed(struct rcu_head *rhp) +{ + struct mm_struct *mm = container_of(rhp, struct mm_struct, delayed_drop); + + __mmdrop(mm); +} +#endif + static inline void __mmput(struct mm_struct *mm) { VM_BUG_ON(atomic_read(&mm->mm_users)); @@ -1495,6 +1533,9 @@ static void rt_mutex_init_task(struct ta */ static void posix_cpu_timers_init(struct task_struct *tsk) { +#ifdef CONFIG_PREEMPT_RT_BASE + tsk->posix_timer_list = NULL; +#endif tsk->cputime_expires.prof_exp = 0; tsk->cputime_expires.virt_exp = 0; tsk->cputime_expires.sched_exp = 0; @@ -1647,6 +1688,7 @@ static __latent_entropy struct task_stru spin_lock_init(&p->alloc_lock); init_sigpending(&p->pending); + p->sigqueue_cache = NULL; p->utime = p->stime = p->gtime = 0; #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME Index: linux-4.14.15-rt12/kernel/futex.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/futex.c +++ linux-4.14.15-rt12/kernel/futex.c @@ -936,7 +936,9 @@ void exit_pi_state_list(struct task_stru if (head->next != next) { /* retain curr->pi_lock for the loop invariant */ raw_spin_unlock(&pi_state->pi_mutex.wait_lock); + raw_spin_unlock_irq(&curr->pi_lock); spin_unlock(&hb->lock); + raw_spin_lock_irq(&curr->pi_lock); put_pi_state(pi_state); continue; } @@ -1430,6 +1432,7 @@ static int wake_futex_pi(u32 __user *uad struct task_struct *new_owner; bool postunlock = false; DEFINE_WAKE_Q(wake_q); + DEFINE_WAKE_Q(wake_sleeper_q); int ret = 0; new_owner = rt_mutex_next_owner(&pi_state->pi_mutex); @@ -1491,13 +1494,13 @@ static int wake_futex_pi(u32 __user *uad pi_state->owner = new_owner; raw_spin_unlock(&new_owner->pi_lock); - postunlock = __rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q); - + postunlock = __rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q, + &wake_sleeper_q); out_unlock: raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock); if (postunlock) - rt_mutex_postunlock(&wake_q); + rt_mutex_postunlock(&wake_q, &wake_sleeper_q); return ret; } @@ -2104,6 +2107,16 @@ retry_private: requeue_pi_wake_futex(this, &key2, hb2); drop_count++; continue; + } else if (ret == -EAGAIN) { + /* + * Waiter was woken by timeout or + * signal and has set pi_blocked_on to + * PI_WAKEUP_INPROGRESS before we + * tried to enqueue it on the rtmutex. + */ + this->pi_state = NULL; + put_pi_state(pi_state); + continue; } else if (ret) { /* * rt_mutex_start_proxy_lock() detected a @@ -2642,10 +2655,9 @@ static int futex_wait(u32 __user *uaddr, if (abs_time) { to = &timeout; - hrtimer_init_on_stack(&to->timer, (flags & FLAGS_CLOCKRT) ? - CLOCK_REALTIME : CLOCK_MONOTONIC, - HRTIMER_MODE_ABS); - hrtimer_init_sleeper(to, current); + hrtimer_init_sleeper_on_stack(to, (flags & FLAGS_CLOCKRT) ? + CLOCK_REALTIME : CLOCK_MONOTONIC, + HRTIMER_MODE_ABS, current); hrtimer_set_expires_range_ns(&to->timer, *abs_time, current->timer_slack_ns); } @@ -2744,9 +2756,8 @@ static int futex_lock_pi(u32 __user *uad if (time) { to = &timeout; - hrtimer_init_on_stack(&to->timer, CLOCK_REALTIME, - HRTIMER_MODE_ABS); - hrtimer_init_sleeper(to, current); + hrtimer_init_sleeper_on_stack(to, CLOCK_REALTIME, + HRTIMER_MODE_ABS, current); hrtimer_set_expires(&to->timer, *time); } @@ -2801,7 +2812,7 @@ retry_private: goto no_block; } - rt_mutex_init_waiter(&rt_waiter); + rt_mutex_init_waiter(&rt_waiter, false); /* * On PREEMPT_RT_FULL, when hb->lock becomes an rt_mutex, we must not @@ -2816,9 +2827,18 @@ retry_private: * lock handoff sequence. */ raw_spin_lock_irq(&q.pi_state->pi_mutex.wait_lock); + /* + * the migrate_disable() here disables migration in the in_atomic() fast + * path which is enabled again in the following spin_unlock(). We have + * one migrate_disable() pending in the slow-path which is reversed + * after the raw_spin_unlock_irq() where we leave the atomic context. + */ + migrate_disable(); + spin_unlock(q.lock_ptr); ret = __rt_mutex_start_proxy_lock(&q.pi_state->pi_mutex, &rt_waiter, current); raw_spin_unlock_irq(&q.pi_state->pi_mutex.wait_lock); + migrate_enable(); if (ret) { if (ret == 1) @@ -2965,11 +2985,21 @@ retry: * observed. */ raw_spin_lock_irq(&pi_state->pi_mutex.wait_lock); + /* + * Magic trickery for now to make the RT migrate disable + * logic happy. The following spin_unlock() happens with + * interrupts disabled so the internal migrate_enable() + * won't undo the migrate_disable() which was issued when + * locking hb->lock. + */ + migrate_disable(); spin_unlock(&hb->lock); /* drops pi_state->pi_mutex.wait_lock */ ret = wake_futex_pi(uaddr, uval, pi_state); + migrate_enable(); + put_pi_state(pi_state); /* @@ -3127,7 +3157,7 @@ static int futex_wait_requeue_pi(u32 __u struct hrtimer_sleeper timeout, *to = NULL; struct futex_pi_state *pi_state = NULL; struct rt_mutex_waiter rt_waiter; - struct futex_hash_bucket *hb; + struct futex_hash_bucket *hb, *hb2; union futex_key key2 = FUTEX_KEY_INIT; struct futex_q q = futex_q_init; int res, ret; @@ -3143,10 +3173,9 @@ static int futex_wait_requeue_pi(u32 __u if (abs_time) { to = &timeout; - hrtimer_init_on_stack(&to->timer, (flags & FLAGS_CLOCKRT) ? - CLOCK_REALTIME : CLOCK_MONOTONIC, - HRTIMER_MODE_ABS); - hrtimer_init_sleeper(to, current); + hrtimer_init_sleeper_on_stack(to, (flags & FLAGS_CLOCKRT) ? + CLOCK_REALTIME : CLOCK_MONOTONIC, + HRTIMER_MODE_ABS, current); hrtimer_set_expires_range_ns(&to->timer, *abs_time, current->timer_slack_ns); } @@ -3155,7 +3184,7 @@ static int futex_wait_requeue_pi(u32 __u * The waiter is allocated on our stack, manipulated by the requeue * code while we sleep on uaddr. */ - rt_mutex_init_waiter(&rt_waiter); + rt_mutex_init_waiter(&rt_waiter, false); ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, VERIFY_WRITE); if (unlikely(ret != 0)) @@ -3186,20 +3215,55 @@ static int futex_wait_requeue_pi(u32 __u /* Queue the futex_q, drop the hb lock, wait for wakeup. */ futex_wait_queue_me(hb, &q, to); - spin_lock(&hb->lock); - ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to); - spin_unlock(&hb->lock); - if (ret) - goto out_put_keys; + /* + * On RT we must avoid races with requeue and trying to block + * on two mutexes (hb->lock and uaddr2's rtmutex) by + * serializing access to pi_blocked_on with pi_lock. + */ + raw_spin_lock_irq(¤t->pi_lock); + if (current->pi_blocked_on) { + /* + * We have been requeued or are in the process of + * being requeued. + */ + raw_spin_unlock_irq(¤t->pi_lock); + } else { + /* + * Setting pi_blocked_on to PI_WAKEUP_INPROGRESS + * prevents a concurrent requeue from moving us to the + * uaddr2 rtmutex. After that we can safely acquire + * (and possibly block on) hb->lock. + */ + current->pi_blocked_on = PI_WAKEUP_INPROGRESS; + raw_spin_unlock_irq(¤t->pi_lock); + + spin_lock(&hb->lock); + + /* + * Clean up pi_blocked_on. We might leak it otherwise + * when we succeeded with the hb->lock in the fast + * path. + */ + raw_spin_lock_irq(¤t->pi_lock); + current->pi_blocked_on = NULL; + raw_spin_unlock_irq(¤t->pi_lock); + + ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to); + spin_unlock(&hb->lock); + if (ret) + goto out_put_keys; + } /* - * In order for us to be here, we know our q.key == key2, and since - * we took the hb->lock above, we also know that futex_requeue() has - * completed and we no longer have to concern ourselves with a wakeup - * race with the atomic proxy lock acquisition by the requeue code. The - * futex_requeue dropped our key1 reference and incremented our key2 - * reference count. + * In order to be here, we have either been requeued, are in + * the process of being requeued, or requeue successfully + * acquired uaddr2 on our behalf. If pi_blocked_on was + * non-null above, we may be racing with a requeue. Do not + * rely on q->lock_ptr to be hb2->lock until after blocking on + * hb->lock or hb2->lock. The futex_requeue dropped our key1 + * reference and incremented our key2 reference count. */ + hb2 = hash_futex(&key2); /* Check if the requeue code acquired the second futex for us. */ if (!q.rt_waiter) { @@ -3208,7 +3272,8 @@ static int futex_wait_requeue_pi(u32 __u * did a lock-steal - fix up the PI-state in that case. */ if (q.pi_state && (q.pi_state->owner != current)) { - spin_lock(q.lock_ptr); + spin_lock(&hb2->lock); + BUG_ON(&hb2->lock != q.lock_ptr); ret = fixup_pi_state_owner(uaddr2, &q, current); if (ret && rt_mutex_owner(&q.pi_state->pi_mutex) == current) { pi_state = q.pi_state; @@ -3219,7 +3284,7 @@ static int futex_wait_requeue_pi(u32 __u * the requeue_pi() code acquired for us. */ put_pi_state(q.pi_state); - spin_unlock(q.lock_ptr); + spin_unlock(&hb2->lock); } } else { struct rt_mutex *pi_mutex; @@ -3233,7 +3298,8 @@ static int futex_wait_requeue_pi(u32 __u pi_mutex = &q.pi_state->pi_mutex; ret = rt_mutex_wait_proxy_lock(pi_mutex, to, &rt_waiter); - spin_lock(q.lock_ptr); + spin_lock(&hb2->lock); + BUG_ON(&hb2->lock != q.lock_ptr); if (ret && !rt_mutex_cleanup_proxy_lock(pi_mutex, &rt_waiter)) ret = 0; Index: linux-4.14.15-rt12/kernel/irq/handle.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/irq/handle.c +++ linux-4.14.15-rt12/kernel/irq/handle.c @@ -183,10 +183,16 @@ irqreturn_t handle_irq_event_percpu(stru { irqreturn_t retval; unsigned int flags = 0; + struct pt_regs *regs = get_irq_regs(); + u64 ip = regs ? instruction_pointer(regs) : 0; retval = __handle_irq_event_percpu(desc, &flags); - add_interrupt_randomness(desc->irq_data.irq, flags); +#ifdef CONFIG_PREEMPT_RT_FULL + desc->random_ip = ip; +#else + add_interrupt_randomness(desc->irq_data.irq, flags, ip); +#endif if (!noirqdebug) note_interrupt(desc, retval); Index: linux-4.14.15-rt12/kernel/irq/manage.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/irq/manage.c +++ linux-4.14.15-rt12/kernel/irq/manage.c @@ -24,6 +24,7 @@ #include "internals.h" #ifdef CONFIG_IRQ_FORCED_THREADING +# ifndef CONFIG_PREEMPT_RT_BASE __read_mostly bool force_irqthreads; static int __init setup_forced_irqthreads(char *arg) @@ -32,6 +33,7 @@ static int __init setup_forced_irqthread return 0; } early_param("threadirqs", setup_forced_irqthreads); +# endif #endif static void __synchronize_hardirq(struct irq_desc *desc) @@ -224,7 +226,12 @@ int irq_set_affinity_locked(struct irq_d if (desc->affinity_notify) { kref_get(&desc->affinity_notify->kref); + +#ifdef CONFIG_PREEMPT_RT_BASE + swork_queue(&desc->affinity_notify->swork); +#else schedule_work(&desc->affinity_notify->work); +#endif } irqd_set(data, IRQD_AFFINITY_SET); @@ -262,10 +269,8 @@ int irq_set_affinity_hint(unsigned int i } EXPORT_SYMBOL_GPL(irq_set_affinity_hint); -static void irq_affinity_notify(struct work_struct *work) +static void _irq_affinity_notify(struct irq_affinity_notify *notify) { - struct irq_affinity_notify *notify = - container_of(work, struct irq_affinity_notify, work); struct irq_desc *desc = irq_to_desc(notify->irq); cpumask_var_t cpumask; unsigned long flags; @@ -287,6 +292,35 @@ out: kref_put(¬ify->kref, notify->release); } +#ifdef CONFIG_PREEMPT_RT_BASE +static void init_helper_thread(void) +{ + static int init_sworker_once; + + if (init_sworker_once) + return; + if (WARN_ON(swork_get())) + return; + init_sworker_once = 1; +} + +static void irq_affinity_notify(struct swork_event *swork) +{ + struct irq_affinity_notify *notify = + container_of(swork, struct irq_affinity_notify, swork); + _irq_affinity_notify(notify); +} + +#else + +static void irq_affinity_notify(struct work_struct *work) +{ + struct irq_affinity_notify *notify = + container_of(work, struct irq_affinity_notify, work); + _irq_affinity_notify(notify); +} +#endif + /** * irq_set_affinity_notifier - control notification of IRQ affinity changes * @irq: Interrupt for which to enable/disable notification @@ -315,7 +349,12 @@ irq_set_affinity_notifier(unsigned int i if (notify) { notify->irq = irq; kref_init(¬ify->kref); +#ifdef CONFIG_PREEMPT_RT_BASE + INIT_SWORK(¬ify->swork, irq_affinity_notify); + init_helper_thread(); +#else INIT_WORK(¬ify->work, irq_affinity_notify); +#endif } raw_spin_lock_irqsave(&desc->lock, flags); @@ -883,7 +922,15 @@ irq_forced_thread_fn(struct irq_desc *de local_bh_disable(); ret = action->thread_fn(action->irq, action->dev_id); irq_finalize_oneshot(desc, action); - local_bh_enable(); + /* + * Interrupts which have real time requirements can be set up + * to avoid softirq processing in the thread handler. This is + * safe as these interrupts do not raise soft interrupts. + */ + if (irq_settings_no_softirq_call(desc)) + _local_bh_enable(); + else + local_bh_enable(); return ret; } @@ -980,6 +1027,12 @@ static int irq_thread(void *data) if (action_ret == IRQ_WAKE_THREAD) irq_wake_secondary(desc, action); +#ifdef CONFIG_PREEMPT_RT_FULL + migrate_disable(); + add_interrupt_randomness(action->irq, 0, + desc->random_ip ^ (unsigned long) action); + migrate_enable(); +#endif wake_threads_waitq(desc); } @@ -1371,6 +1424,9 @@ __setup_irq(unsigned int irq, struct irq irqd_set(&desc->irq_data, IRQD_NO_BALANCING); } + if (new->flags & IRQF_NO_SOFTIRQ_CALL) + irq_settings_set_no_softirq_call(desc); + if (irq_settings_can_autoenable(desc)) { irq_startup(desc, IRQ_RESEND, IRQ_START_COND); } else { @@ -2152,7 +2208,7 @@ EXPORT_SYMBOL_GPL(irq_get_irqchip_state) * This call sets the internal irqchip state of an interrupt, * depending on the value of @which. * - * This function should be called with preemption disabled if the + * This function should be called with migration disabled if the * interrupt controller has per-cpu registers. */ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which, Index: linux-4.14.15-rt12/kernel/irq/settings.h =================================================================== --- linux-4.14.15-rt12.orig/kernel/irq/settings.h +++ linux-4.14.15-rt12/kernel/irq/settings.h @@ -17,6 +17,7 @@ enum { _IRQ_PER_CPU_DEVID = IRQ_PER_CPU_DEVID, _IRQ_IS_POLLED = IRQ_IS_POLLED, _IRQ_DISABLE_UNLAZY = IRQ_DISABLE_UNLAZY, + _IRQ_NO_SOFTIRQ_CALL = IRQ_NO_SOFTIRQ_CALL, _IRQF_MODIFY_MASK = IRQF_MODIFY_MASK, }; @@ -31,6 +32,7 @@ enum { #define IRQ_PER_CPU_DEVID GOT_YOU_MORON #define IRQ_IS_POLLED GOT_YOU_MORON #define IRQ_DISABLE_UNLAZY GOT_YOU_MORON +#define IRQ_NO_SOFTIRQ_CALL GOT_YOU_MORON #undef IRQF_MODIFY_MASK #define IRQF_MODIFY_MASK GOT_YOU_MORON @@ -41,6 +43,16 @@ irq_settings_clr_and_set(struct irq_desc desc->status_use_accessors |= (set & _IRQF_MODIFY_MASK); } +static inline bool irq_settings_no_softirq_call(struct irq_desc *desc) +{ + return desc->status_use_accessors & _IRQ_NO_SOFTIRQ_CALL; +} + +static inline void irq_settings_set_no_softirq_call(struct irq_desc *desc) +{ + desc->status_use_accessors |= _IRQ_NO_SOFTIRQ_CALL; +} + static inline bool irq_settings_is_per_cpu(struct irq_desc *desc) { return desc->status_use_accessors & _IRQ_PER_CPU; Index: linux-4.14.15-rt12/kernel/irq/spurious.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/irq/spurious.c +++ linux-4.14.15-rt12/kernel/irq/spurious.c @@ -445,6 +445,10 @@ MODULE_PARM_DESC(noirqdebug, "Disable ir static int __init irqfixup_setup(char *str) { +#ifdef CONFIG_PREEMPT_RT_BASE + pr_warn("irqfixup boot option not supported w/ CONFIG_PREEMPT_RT_BASE\n"); + return 1; +#endif irqfixup = 1; printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n"); printk(KERN_WARNING "This may impact system performance.\n"); @@ -457,6 +461,10 @@ module_param(irqfixup, int, 0644); static int __init irqpoll_setup(char *str) { +#ifdef CONFIG_PREEMPT_RT_BASE + pr_warn("irqpoll boot option not supported w/ CONFIG_PREEMPT_RT_BASE\n"); + return 1; +#endif irqfixup = 2; printk(KERN_WARNING "Misrouted IRQ fixup and polling support " "enabled\n"); Index: linux-4.14.15-rt12/kernel/irq_work.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/irq_work.c +++ linux-4.14.15-rt12/kernel/irq_work.c @@ -17,6 +17,7 @@ #include #include #include +#include #include @@ -65,6 +66,8 @@ void __weak arch_irq_work_raise(void) */ bool irq_work_queue_on(struct irq_work *work, int cpu) { + struct llist_head *list; + /* All work should have been flushed before going offline */ WARN_ON_ONCE(cpu_is_offline(cpu)); @@ -75,7 +78,12 @@ bool irq_work_queue_on(struct irq_work * if (!irq_work_claim(work)) return false; - if (llist_add(&work->llnode, &per_cpu(raised_list, cpu))) + if (IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && !(work->flags & IRQ_WORK_HARD_IRQ)) + list = &per_cpu(lazy_list, cpu); + else + list = &per_cpu(raised_list, cpu); + + if (llist_add(&work->llnode, list)) arch_send_call_function_single_ipi(cpu); return true; @@ -86,6 +94,9 @@ EXPORT_SYMBOL_GPL(irq_work_queue_on); /* Enqueue the irq work @work on the current CPU */ bool irq_work_queue(struct irq_work *work) { + struct llist_head *list; + bool lazy_work, realtime = IS_ENABLED(CONFIG_PREEMPT_RT_FULL); + /* Only queue if not already pending */ if (!irq_work_claim(work)) return false; @@ -93,13 +104,15 @@ bool irq_work_queue(struct irq_work *wor /* Queue the entry and raise the IPI if needed. */ preempt_disable(); - /* If the work is "lazy", handle it from next tick if any */ - if (work->flags & IRQ_WORK_LAZY) { - if (llist_add(&work->llnode, this_cpu_ptr(&lazy_list)) && - tick_nohz_tick_stopped()) - arch_irq_work_raise(); - } else { - if (llist_add(&work->llnode, this_cpu_ptr(&raised_list))) + lazy_work = work->flags & IRQ_WORK_LAZY; + + if (lazy_work || (realtime && !(work->flags & IRQ_WORK_HARD_IRQ))) + list = this_cpu_ptr(&lazy_list); + else + list = this_cpu_ptr(&raised_list); + + if (llist_add(&work->llnode, list)) { + if (!lazy_work || tick_nohz_tick_stopped()) arch_irq_work_raise(); } @@ -116,9 +129,8 @@ bool irq_work_needs_cpu(void) raised = this_cpu_ptr(&raised_list); lazy = this_cpu_ptr(&lazy_list); - if (llist_empty(raised) || arch_irq_work_has_interrupt()) - if (llist_empty(lazy)) - return false; + if (llist_empty(raised) && llist_empty(lazy)) + return false; /* All work should have been flushed before going offline */ WARN_ON_ONCE(cpu_is_offline(smp_processor_id())); @@ -132,7 +144,7 @@ static void irq_work_run_list(struct lli struct irq_work *work; struct llist_node *llnode; - BUG_ON(!irqs_disabled()); + BUG_ON_NONRT(!irqs_disabled()); if (llist_empty(list)) return; @@ -169,7 +181,16 @@ static void irq_work_run_list(struct lli void irq_work_run(void) { irq_work_run_list(this_cpu_ptr(&raised_list)); - irq_work_run_list(this_cpu_ptr(&lazy_list)); + if (IS_ENABLED(CONFIG_PREEMPT_RT_FULL)) { + /* + * NOTE: we raise softirq via IPI for safety, + * and execute in irq_work_tick() to move the + * overhead from hard to soft irq context. + */ + if (!llist_empty(this_cpu_ptr(&lazy_list))) + raise_softirq(TIMER_SOFTIRQ); + } else + irq_work_run_list(this_cpu_ptr(&lazy_list)); } EXPORT_SYMBOL_GPL(irq_work_run); @@ -179,8 +200,17 @@ void irq_work_tick(void) if (!llist_empty(raised) && !arch_irq_work_has_interrupt()) irq_work_run_list(raised); + + if (!IS_ENABLED(CONFIG_PREEMPT_RT_FULL)) + irq_work_run_list(this_cpu_ptr(&lazy_list)); +} + +#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL) +void irq_work_tick_soft(void) +{ irq_work_run_list(this_cpu_ptr(&lazy_list)); } +#endif /* * Synchronize against the irq_work @entry, ensures the entry is not Index: linux-4.14.15-rt12/kernel/ksysfs.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/ksysfs.c +++ linux-4.14.15-rt12/kernel/ksysfs.c @@ -140,6 +140,15 @@ KERNEL_ATTR_RO(vmcoreinfo); #endif /* CONFIG_CRASH_CORE */ +#if defined(CONFIG_PREEMPT_RT_FULL) +static ssize_t realtime_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", 1); +} +KERNEL_ATTR_RO(realtime); +#endif + /* whether file capabilities are enabled */ static ssize_t fscaps_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) @@ -231,6 +240,9 @@ static struct attribute * kernel_attrs[] &rcu_expedited_attr.attr, &rcu_normal_attr.attr, #endif +#ifdef CONFIG_PREEMPT_RT_FULL + &realtime_attr.attr, +#endif NULL }; Index: linux-4.14.15-rt12/kernel/locking/Makefile =================================================================== --- linux-4.14.15-rt12.orig/kernel/locking/Makefile +++ linux-4.14.15-rt12/kernel/locking/Makefile @@ -3,7 +3,7 @@ # and is generally not a function of system call inputs. KCOV_INSTRUMENT := n -obj-y += mutex.o semaphore.o rwsem.o percpu-rwsem.o +obj-y += semaphore.o percpu-rwsem.o ifdef CONFIG_FUNCTION_TRACER CFLAGS_REMOVE_lockdep.o = $(CC_FLAGS_FTRACE) @@ -12,7 +12,11 @@ CFLAGS_REMOVE_mutex-debug.o = $(CC_FLAGS CFLAGS_REMOVE_rtmutex-debug.o = $(CC_FLAGS_FTRACE) endif +ifneq ($(CONFIG_PREEMPT_RT_FULL),y) +obj-y += mutex.o obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o +endif +obj-y += rwsem.o obj-$(CONFIG_LOCKDEP) += lockdep.o ifeq ($(CONFIG_PROC_FS),y) obj-$(CONFIG_LOCKDEP) += lockdep_proc.o @@ -25,8 +29,11 @@ obj-$(CONFIG_RT_MUTEXES) += rtmutex.o obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o +ifneq ($(CONFIG_PREEMPT_RT_FULL),y) obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem-xadd.o +endif +obj-$(CONFIG_PREEMPT_RT_FULL) += mutex-rt.o rwsem-rt.o rwlock-rt.o obj-$(CONFIG_QUEUED_RWLOCKS) += qrwlock.o obj-$(CONFIG_LOCK_TORTURE_TEST) += locktorture.o obj-$(CONFIG_WW_MUTEX_SELFTEST) += test-ww_mutex.o Index: linux-4.14.15-rt12/kernel/locking/lockdep.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/locking/lockdep.c +++ linux-4.14.15-rt12/kernel/locking/lockdep.c @@ -3914,6 +3914,7 @@ static void check_flags(unsigned long fl } } +#ifndef CONFIG_PREEMPT_RT_FULL /* * We dont accurately track softirq state in e.g. * hardirq contexts (such as on 4KSTACKS), so only @@ -3928,6 +3929,7 @@ static void check_flags(unsigned long fl DEBUG_LOCKS_WARN_ON(!current->softirqs_enabled); } } +#endif if (!debug_locks) print_irqtrace_events(current); Index: linux-4.14.15-rt12/kernel/locking/locktorture.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/locking/locktorture.c +++ linux-4.14.15-rt12/kernel/locking/locktorture.c @@ -26,7 +26,6 @@ #include #include #include -#include #include #include #include Index: linux-4.14.15-rt12/kernel/locking/mutex-rt.c =================================================================== --- /dev/null +++ linux-4.14.15-rt12/kernel/locking/mutex-rt.c @@ -0,0 +1,223 @@ +/* + * kernel/rt.c + * + * Real-Time Preemption Support + * + * started by Ingo Molnar: + * + * Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar + * Copyright (C) 2006, Timesys Corp., Thomas Gleixner + * + * historic credit for proving that Linux spinlocks can be implemented via + * RT-aware mutexes goes to many people: The Pmutex project (Dirk Grambow + * and others) who prototyped it on 2.4 and did lots of comparative + * research and analysis; TimeSys, for proving that you can implement a + * fully preemptible kernel via the use of IRQ threading and mutexes; + * Bill Huey for persuasively arguing on lkml that the mutex model is the + * right one; and to MontaVista, who ported pmutexes to 2.6. + * + * This code is a from-scratch implementation and is not based on pmutexes, + * but the idea of converting spinlocks to mutexes is used here too. + * + * lock debugging, locking tree, deadlock detection: + * + * Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey + * Released under the General Public License (GPL). + * + * Includes portions of the generic R/W semaphore implementation from: + * + * Copyright (c) 2001 David Howells (dhowells@redhat.com). + * - Derived partially from idea by Andrea Arcangeli + * - Derived also from comments by Linus + * + * Pending ownership of locks and ownership stealing: + * + * Copyright (C) 2005, Kihon Technologies Inc., Steven Rostedt + * + * (also by Steven Rostedt) + * - Converted single pi_lock to individual task locks. + * + * By Esben Nielsen: + * Doing priority inheritance with help of the scheduler. + * + * Copyright (C) 2006, Timesys Corp., Thomas Gleixner + * - major rework based on Esben Nielsens initial patch + * - replaced thread_info references by task_struct refs + * - removed task->pending_owner dependency + * - BKL drop/reacquire for semaphore style locks to avoid deadlocks + * in the scheduler return path as discussed with Steven Rostedt + * + * Copyright (C) 2006, Kihon Technologies Inc. + * Steven Rostedt + * - debugged and patched Thomas Gleixner's rework. + * - added back the cmpxchg to the rework. + * - turned atomic require back on for SMP. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "rtmutex_common.h" + +/* + * struct mutex functions + */ +void __mutex_do_init(struct mutex *mutex, const char *name, + struct lock_class_key *key) +{ +#ifdef CONFIG_DEBUG_LOCK_ALLOC + /* + * Make sure we are not reinitializing a held lock: + */ + debug_check_no_locks_freed((void *)mutex, sizeof(*mutex)); + lockdep_init_map(&mutex->dep_map, name, key, 0); +#endif + mutex->lock.save_state = 0; +} +EXPORT_SYMBOL(__mutex_do_init); + +void __lockfunc _mutex_lock(struct mutex *lock) +{ + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); + __rt_mutex_lock_state(&lock->lock, TASK_UNINTERRUPTIBLE); +} +EXPORT_SYMBOL(_mutex_lock); + +void __lockfunc _mutex_lock_io(struct mutex *lock) +{ + int token; + + token = io_schedule_prepare(); + _mutex_lock(lock); + io_schedule_finish(token); +} +EXPORT_SYMBOL_GPL(_mutex_lock_io); + +int __lockfunc _mutex_lock_interruptible(struct mutex *lock) +{ + int ret; + + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); + ret = __rt_mutex_lock_state(&lock->lock, TASK_INTERRUPTIBLE); + if (ret) + mutex_release(&lock->dep_map, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(_mutex_lock_interruptible); + +int __lockfunc _mutex_lock_killable(struct mutex *lock) +{ + int ret; + + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); + ret = __rt_mutex_lock_state(&lock->lock, TASK_KILLABLE); + if (ret) + mutex_release(&lock->dep_map, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(_mutex_lock_killable); + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass) +{ + mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_); + __rt_mutex_lock_state(&lock->lock, TASK_UNINTERRUPTIBLE); +} +EXPORT_SYMBOL(_mutex_lock_nested); + +void __lockfunc _mutex_lock_io_nested(struct mutex *lock, int subclass) +{ + int token; + + token = io_schedule_prepare(); + + mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_); + __rt_mutex_lock_state(&lock->lock, TASK_UNINTERRUPTIBLE); + + io_schedule_finish(token); +} +EXPORT_SYMBOL_GPL(_mutex_lock_io_nested); + +void __lockfunc _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest) +{ + mutex_acquire_nest(&lock->dep_map, 0, 0, nest, _RET_IP_); + __rt_mutex_lock_state(&lock->lock, TASK_UNINTERRUPTIBLE); +} +EXPORT_SYMBOL(_mutex_lock_nest_lock); + +int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass) +{ + int ret; + + mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_); + ret = __rt_mutex_lock_state(&lock->lock, TASK_INTERRUPTIBLE); + if (ret) + mutex_release(&lock->dep_map, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(_mutex_lock_interruptible_nested); + +int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass) +{ + int ret; + + mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_); + ret = __rt_mutex_lock_state(&lock->lock, TASK_KILLABLE); + if (ret) + mutex_release(&lock->dep_map, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(_mutex_lock_killable_nested); +#endif + +int __lockfunc _mutex_trylock(struct mutex *lock) +{ + int ret = __rt_mutex_trylock(&lock->lock); + + if (ret) + mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_); + + return ret; +} +EXPORT_SYMBOL(_mutex_trylock); + +void __lockfunc _mutex_unlock(struct mutex *lock) +{ + mutex_release(&lock->dep_map, 1, _RET_IP_); + __rt_mutex_unlock(&lock->lock); +} +EXPORT_SYMBOL(_mutex_unlock); + +/** + * atomic_dec_and_mutex_lock - return holding mutex if we dec to 0 + * @cnt: the atomic which we are to dec + * @lock: the mutex to return holding if we dec to 0 + * + * return true and hold lock if we dec to 0, return false otherwise + */ +int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock) +{ + /* dec if we can't possibly hit 0 */ + if (atomic_add_unless(cnt, -1, 1)) + return 0; + /* we might hit 0, so take the lock */ + mutex_lock(lock); + if (!atomic_dec_and_test(cnt)) { + /* when we actually did the dec, we didn't hit 0 */ + mutex_unlock(lock); + return 0; + } + /* we hit 0, and we hold the lock */ + return 1; +} +EXPORT_SYMBOL(atomic_dec_and_mutex_lock); Index: linux-4.14.15-rt12/kernel/locking/rtmutex.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/locking/rtmutex.c +++ linux-4.14.15-rt12/kernel/locking/rtmutex.c @@ -7,6 +7,11 @@ * Copyright (C) 2005-2006 Timesys Corp., Thomas Gleixner * Copyright (C) 2005 Kihon Technologies Inc., Steven Rostedt * Copyright (C) 2006 Esben Nielsen + * Adaptive Spinlocks: + * Copyright (C) 2008 Novell, Inc., Gregory Haskins, Sven Dietrich, + * and Peter Morreale, + * Adaptive Spinlocks simplification: + * Copyright (C) 2008 Red Hat, Inc., Steven Rostedt * * See Documentation/locking/rt-mutex-design.txt for details. */ @@ -18,6 +23,8 @@ #include #include #include +#include +#include #include "rtmutex_common.h" @@ -135,6 +142,12 @@ static void fixup_rt_mutex_waiters(struc WRITE_ONCE(*p, owner & ~RT_MUTEX_HAS_WAITERS); } +static int rt_mutex_real_waiter(struct rt_mutex_waiter *waiter) +{ + return waiter && waiter != PI_WAKEUP_INPROGRESS && + waiter != PI_REQUEUE_INPROGRESS; +} + /* * We can speed up the acquire/release, if there's no debugging state to be * set up. @@ -228,7 +241,7 @@ static inline bool unlock_rt_mutex_safe( * Only use with rt_mutex_waiter_{less,equal}() */ #define task_to_waiter(p) \ - &(struct rt_mutex_waiter){ .prio = (p)->prio, .deadline = (p)->dl.deadline } + &(struct rt_mutex_waiter){ .prio = (p)->prio, .deadline = (p)->dl.deadline, .task = (p) } static inline int rt_mutex_waiter_less(struct rt_mutex_waiter *left, @@ -268,6 +281,27 @@ rt_mutex_waiter_equal(struct rt_mutex_wa return 1; } +#define STEAL_NORMAL 0 +#define STEAL_LATERAL 1 + +static inline int +rt_mutex_steal(struct rt_mutex *lock, struct rt_mutex_waiter *waiter, int mode) +{ + struct rt_mutex_waiter *top_waiter = rt_mutex_top_waiter(lock); + + if (waiter == top_waiter || rt_mutex_waiter_less(waiter, top_waiter)) + return 1; + + /* + * Note that RT tasks are excluded from lateral-steals + * to prevent the introduction of an unbounded latency. + */ + if (mode == STEAL_NORMAL || rt_task(waiter->task)) + return 0; + + return rt_mutex_waiter_equal(waiter, top_waiter); +} + static void rt_mutex_enqueue(struct rt_mutex *lock, struct rt_mutex_waiter *waiter) { @@ -372,6 +406,14 @@ static bool rt_mutex_cond_detect_deadloc return debug_rt_mutex_detect_deadlock(waiter, chwalk); } +static void rt_mutex_wake_waiter(struct rt_mutex_waiter *waiter) +{ + if (waiter->savestate) + wake_up_lock_sleeper(waiter->task); + else + wake_up_process(waiter->task); +} + /* * Max number of times we'll walk the boosting chain: */ @@ -379,7 +421,8 @@ int max_lock_depth = 1024; static inline struct rt_mutex *task_blocked_on_lock(struct task_struct *p) { - return p->pi_blocked_on ? p->pi_blocked_on->lock : NULL; + return rt_mutex_real_waiter(p->pi_blocked_on) ? + p->pi_blocked_on->lock : NULL; } /* @@ -515,7 +558,7 @@ static int rt_mutex_adjust_prio_chain(st * reached or the state of the chain has changed while we * dropped the locks. */ - if (!waiter) + if (!rt_mutex_real_waiter(waiter)) goto out_unlock_pi; /* @@ -696,13 +739,16 @@ static int rt_mutex_adjust_prio_chain(st * follow here. This is the end of the chain we are walking. */ if (!rt_mutex_owner(lock)) { + struct rt_mutex_waiter *lock_top_waiter; + /* * If the requeue [7] above changed the top waiter, * then we need to wake the new top waiter up to try * to get the lock. */ - if (prerequeue_top_waiter != rt_mutex_top_waiter(lock)) - wake_up_process(rt_mutex_top_waiter(lock)->task); + lock_top_waiter = rt_mutex_top_waiter(lock); + if (prerequeue_top_waiter != lock_top_waiter) + rt_mutex_wake_waiter(lock_top_waiter); raw_spin_unlock_irq(&lock->wait_lock); return 0; } @@ -804,9 +850,11 @@ static int rt_mutex_adjust_prio_chain(st * @task: The task which wants to acquire the lock * @waiter: The waiter that is queued to the lock's wait tree if the * callsite called task_blocked_on_lock(), otherwise NULL + * @mode: Lock steal mode (STEAL_NORMAL, STEAL_LATERAL) */ -static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task, - struct rt_mutex_waiter *waiter) +static int __try_to_take_rt_mutex(struct rt_mutex *lock, + struct task_struct *task, + struct rt_mutex_waiter *waiter, int mode) { lockdep_assert_held(&lock->wait_lock); @@ -842,12 +890,11 @@ static int try_to_take_rt_mutex(struct r */ if (waiter) { /* - * If waiter is not the highest priority waiter of - * @lock, give up. + * If waiter is not the highest priority waiter of @lock, + * or its peer when lateral steal is allowed, give up. */ - if (waiter != rt_mutex_top_waiter(lock)) + if (!rt_mutex_steal(lock, waiter, mode)) return 0; - /* * We can acquire the lock. Remove the waiter from the * lock waiters tree. @@ -865,14 +912,12 @@ static int try_to_take_rt_mutex(struct r */ if (rt_mutex_has_waiters(lock)) { /* - * If @task->prio is greater than or equal to - * the top waiter priority (kernel view), - * @task lost. + * If @task->prio is greater than the top waiter + * priority (kernel view), or equal to it when a + * lateral steal is forbidden, @task lost. */ - if (!rt_mutex_waiter_less(task_to_waiter(task), - rt_mutex_top_waiter(lock))) + if (!rt_mutex_steal(lock, task_to_waiter(task), mode)) return 0; - /* * The current top waiter stays enqueued. We * don't have to change anything in the lock @@ -919,6 +964,343 @@ takeit: return 1; } +#ifdef CONFIG_PREEMPT_RT_FULL +/* + * preemptible spin_lock functions: + */ +static inline void rt_spin_lock_fastlock(struct rt_mutex *lock, + void (*slowfn)(struct rt_mutex *lock)) +{ + might_sleep_no_state_check(); + + if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) + return; + else + slowfn(lock); +} + +static inline void rt_spin_lock_fastunlock(struct rt_mutex *lock, + void (*slowfn)(struct rt_mutex *lock)) +{ + if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) + return; + else + slowfn(lock); +} +#ifdef CONFIG_SMP +/* + * Note that owner is a speculative pointer and dereferencing relies + * on rcu_read_lock() and the check against the lock owner. + */ +static int adaptive_wait(struct rt_mutex *lock, + struct task_struct *owner) +{ + int res = 0; + + rcu_read_lock(); + for (;;) { + if (owner != rt_mutex_owner(lock)) + break; + /* + * Ensure that owner->on_cpu is dereferenced _after_ + * checking the above to be valid. + */ + barrier(); + if (!owner->on_cpu) { + res = 1; + break; + } + cpu_relax(); + } + rcu_read_unlock(); + return res; +} +#else +static int adaptive_wait(struct rt_mutex *lock, + struct task_struct *orig_owner) +{ + return 1; +} +#endif + +static int task_blocks_on_rt_mutex(struct rt_mutex *lock, + struct rt_mutex_waiter *waiter, + struct task_struct *task, + enum rtmutex_chainwalk chwalk); +/* + * Slow path lock function spin_lock style: this variant is very + * careful not to miss any non-lock wakeups. + * + * We store the current state under p->pi_lock in p->saved_state and + * the try_to_wake_up() code handles this accordingly. + */ +void __sched rt_spin_lock_slowlock_locked(struct rt_mutex *lock, + struct rt_mutex_waiter *waiter, + unsigned long flags) +{ + struct task_struct *lock_owner, *self = current; + struct rt_mutex_waiter *top_waiter; + int ret; + + if (__try_to_take_rt_mutex(lock, self, NULL, STEAL_LATERAL)) + return; + + BUG_ON(rt_mutex_owner(lock) == self); + + /* + * We save whatever state the task is in and we'll restore it + * after acquiring the lock taking real wakeups into account + * as well. We are serialized via pi_lock against wakeups. See + * try_to_wake_up(). + */ + raw_spin_lock(&self->pi_lock); + self->saved_state = self->state; + __set_current_state_no_track(TASK_UNINTERRUPTIBLE); + raw_spin_unlock(&self->pi_lock); + + ret = task_blocks_on_rt_mutex(lock, waiter, self, RT_MUTEX_MIN_CHAINWALK); + BUG_ON(ret); + + for (;;) { + /* Try to acquire the lock again. */ + if (__try_to_take_rt_mutex(lock, self, waiter, STEAL_LATERAL)) + break; + + top_waiter = rt_mutex_top_waiter(lock); + lock_owner = rt_mutex_owner(lock); + + raw_spin_unlock_irqrestore(&lock->wait_lock, flags); + + debug_rt_mutex_print_deadlock(waiter); + + if (top_waiter != waiter || adaptive_wait(lock, lock_owner)) + schedule(); + + raw_spin_lock_irqsave(&lock->wait_lock, flags); + + raw_spin_lock(&self->pi_lock); + __set_current_state_no_track(TASK_UNINTERRUPTIBLE); + raw_spin_unlock(&self->pi_lock); + } + + /* + * Restore the task state to current->saved_state. We set it + * to the original state above and the try_to_wake_up() code + * has possibly updated it when a real (non-rtmutex) wakeup + * happened while we were blocked. Clear saved_state so + * try_to_wakeup() does not get confused. + */ + raw_spin_lock(&self->pi_lock); + __set_current_state_no_track(self->saved_state); + self->saved_state = TASK_RUNNING; + raw_spin_unlock(&self->pi_lock); + + /* + * try_to_take_rt_mutex() sets the waiter bit + * unconditionally. We might have to fix that up: + */ + fixup_rt_mutex_waiters(lock); + + BUG_ON(rt_mutex_has_waiters(lock) && waiter == rt_mutex_top_waiter(lock)); + BUG_ON(!RB_EMPTY_NODE(&waiter->tree_entry)); +} + +static void noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock) +{ + struct rt_mutex_waiter waiter; + unsigned long flags; + + rt_mutex_init_waiter(&waiter, true); + + raw_spin_lock_irqsave(&lock->wait_lock, flags); + rt_spin_lock_slowlock_locked(lock, &waiter, flags); + raw_spin_unlock_irqrestore(&lock->wait_lock, flags); + debug_rt_mutex_free_waiter(&waiter); +} + +static bool __sched __rt_mutex_unlock_common(struct rt_mutex *lock, + struct wake_q_head *wake_q, + struct wake_q_head *wq_sleeper); +/* + * Slow path to release a rt_mutex spin_lock style + */ +void __sched rt_spin_lock_slowunlock(struct rt_mutex *lock) +{ + unsigned long flags; + DEFINE_WAKE_Q(wake_q); + DEFINE_WAKE_Q(wake_sleeper_q); + bool postunlock; + + raw_spin_lock_irqsave(&lock->wait_lock, flags); + postunlock = __rt_mutex_unlock_common(lock, &wake_q, &wake_sleeper_q); + raw_spin_unlock_irqrestore(&lock->wait_lock, flags); + + if (postunlock) + rt_mutex_postunlock(&wake_q, &wake_sleeper_q); +} + +void __lockfunc rt_spin_lock(spinlock_t *lock) +{ + migrate_disable(); + spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); + rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock); +} +EXPORT_SYMBOL(rt_spin_lock); + +void __lockfunc __rt_spin_lock(struct rt_mutex *lock) +{ + rt_spin_lock_fastlock(lock, rt_spin_lock_slowlock); +} + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass) +{ + migrate_disable(); + spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_); + rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock); +} +EXPORT_SYMBOL(rt_spin_lock_nested); +#endif + +void __lockfunc rt_spin_unlock(spinlock_t *lock) +{ + /* NOTE: we always pass in '1' for nested, for simplicity */ + spin_release(&lock->dep_map, 1, _RET_IP_); + rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock); + migrate_enable(); +} +EXPORT_SYMBOL(rt_spin_unlock); + +void __lockfunc __rt_spin_unlock(struct rt_mutex *lock) +{ + rt_spin_lock_fastunlock(lock, rt_spin_lock_slowunlock); +} +EXPORT_SYMBOL(__rt_spin_unlock); + +/* + * Wait for the lock to get unlocked: instead of polling for an unlock + * (like raw spinlocks do), we lock and unlock, to force the kernel to + * schedule if there's contention: + */ +void __lockfunc rt_spin_unlock_wait(spinlock_t *lock) +{ + spin_lock(lock); + spin_unlock(lock); +} +EXPORT_SYMBOL(rt_spin_unlock_wait); + +int __lockfunc rt_spin_trylock(spinlock_t *lock) +{ + int ret; + + migrate_disable(); + ret = __rt_mutex_trylock(&lock->lock); + if (ret) + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); + else + migrate_enable(); + return ret; +} +EXPORT_SYMBOL(rt_spin_trylock); + +int __lockfunc rt_spin_trylock_bh(spinlock_t *lock) +{ + int ret; + + local_bh_disable(); + ret = __rt_mutex_trylock(&lock->lock); + if (ret) { + migrate_disable(); + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); + } else + local_bh_enable(); + return ret; +} +EXPORT_SYMBOL(rt_spin_trylock_bh); + +int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags) +{ + int ret; + + *flags = 0; + ret = __rt_mutex_trylock(&lock->lock); + if (ret) { + migrate_disable(); + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); + } + return ret; +} +EXPORT_SYMBOL(rt_spin_trylock_irqsave); + +int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock) +{ + /* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */ + if (atomic_add_unless(atomic, -1, 1)) + return 0; + rt_spin_lock(lock); + if (atomic_dec_and_test(atomic)) + return 1; + rt_spin_unlock(lock); + return 0; +} +EXPORT_SYMBOL(atomic_dec_and_spin_lock); + +void +__rt_spin_lock_init(spinlock_t *lock, const char *name, struct lock_class_key *key) +{ +#ifdef CONFIG_DEBUG_LOCK_ALLOC + /* + * Make sure we are not reinitializing a held lock: + */ + debug_check_no_locks_freed((void *)lock, sizeof(*lock)); + lockdep_init_map(&lock->dep_map, name, key, 0); +#endif +} +EXPORT_SYMBOL(__rt_spin_lock_init); + +#endif /* PREEMPT_RT_FULL */ + +#ifdef CONFIG_PREEMPT_RT_FULL + static inline int __sched +__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx) +{ + struct ww_mutex *ww = container_of(lock, struct ww_mutex, base.lock); + struct ww_acquire_ctx *hold_ctx = ACCESS_ONCE(ww->ctx); + + if (!hold_ctx) + return 0; + + if (unlikely(ctx == hold_ctx)) + return -EALREADY; + + if (ctx->stamp - hold_ctx->stamp <= LONG_MAX && + (ctx->stamp != hold_ctx->stamp || ctx > hold_ctx)) { +#ifdef CONFIG_DEBUG_MUTEXES + DEBUG_LOCKS_WARN_ON(ctx->contending_lock); + ctx->contending_lock = ww; +#endif + return -EDEADLK; + } + + return 0; +} +#else + static inline int __sched +__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx) +{ + BUG(); + return 0; +} + +#endif + +static inline int +try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task, + struct rt_mutex_waiter *waiter) +{ + return __try_to_take_rt_mutex(lock, task, waiter, STEAL_NORMAL); +} + /* * Task blocks on lock. * @@ -951,6 +1333,22 @@ static int task_blocks_on_rt_mutex(struc return -EDEADLK; raw_spin_lock(&task->pi_lock); + /* + * In the case of futex requeue PI, this will be a proxy + * lock. The task will wake unaware that it is enqueueed on + * this lock. Avoid blocking on two locks and corrupting + * pi_blocked_on via the PI_WAKEUP_INPROGRESS + * flag. futex_wait_requeue_pi() sets this when it wakes up + * before requeue (due to a signal or timeout). Do not enqueue + * the task if PI_WAKEUP_INPROGRESS is set. + */ + if (task != current && task->pi_blocked_on == PI_WAKEUP_INPROGRESS) { + raw_spin_unlock(&task->pi_lock); + return -EAGAIN; + } + + BUG_ON(rt_mutex_real_waiter(task->pi_blocked_on)); + waiter->task = task; waiter->lock = lock; waiter->prio = task->prio; @@ -974,7 +1372,7 @@ static int task_blocks_on_rt_mutex(struc rt_mutex_enqueue_pi(owner, waiter); rt_mutex_adjust_prio(owner); - if (owner->pi_blocked_on) + if (rt_mutex_real_waiter(owner->pi_blocked_on)) chain_walk = 1; } else if (rt_mutex_cond_detect_deadlock(waiter, chwalk)) { chain_walk = 1; @@ -1016,6 +1414,7 @@ static int task_blocks_on_rt_mutex(struc * Called with lock->wait_lock held and interrupts disabled. */ static void mark_wakeup_next_waiter(struct wake_q_head *wake_q, + struct wake_q_head *wake_sleeper_q, struct rt_mutex *lock) { struct rt_mutex_waiter *waiter; @@ -1055,7 +1454,10 @@ static void mark_wakeup_next_waiter(stru * Pairs with preempt_enable() in rt_mutex_postunlock(); */ preempt_disable(); - wake_q_add(wake_q, waiter->task); + if (waiter->savestate) + wake_q_add_sleeper(wake_sleeper_q, waiter->task); + else + wake_q_add(wake_q, waiter->task); raw_spin_unlock(¤t->pi_lock); } @@ -1070,7 +1472,7 @@ static void remove_waiter(struct rt_mute { bool is_top_waiter = (waiter == rt_mutex_top_waiter(lock)); struct task_struct *owner = rt_mutex_owner(lock); - struct rt_mutex *next_lock; + struct rt_mutex *next_lock = NULL; lockdep_assert_held(&lock->wait_lock); @@ -1096,7 +1498,8 @@ static void remove_waiter(struct rt_mute rt_mutex_adjust_prio(owner); /* Store the lock on which owner is blocked or NULL */ - next_lock = task_blocked_on_lock(owner); + if (rt_mutex_real_waiter(owner->pi_blocked_on)) + next_lock = task_blocked_on_lock(owner); raw_spin_unlock(&owner->pi_lock); @@ -1132,26 +1535,28 @@ void rt_mutex_adjust_pi(struct task_stru raw_spin_lock_irqsave(&task->pi_lock, flags); waiter = task->pi_blocked_on; - if (!waiter || rt_mutex_waiter_equal(waiter, task_to_waiter(task))) { + if (!rt_mutex_real_waiter(waiter) || + rt_mutex_waiter_equal(waiter, task_to_waiter(task))) { raw_spin_unlock_irqrestore(&task->pi_lock, flags); return; } next_lock = waiter->lock; - raw_spin_unlock_irqrestore(&task->pi_lock, flags); /* gets dropped in rt_mutex_adjust_prio_chain()! */ get_task_struct(task); + raw_spin_unlock_irqrestore(&task->pi_lock, flags); rt_mutex_adjust_prio_chain(task, RT_MUTEX_MIN_CHAINWALK, NULL, next_lock, NULL, task); } -void rt_mutex_init_waiter(struct rt_mutex_waiter *waiter) +void rt_mutex_init_waiter(struct rt_mutex_waiter *waiter, bool savestate) { debug_rt_mutex_init_waiter(waiter); RB_CLEAR_NODE(&waiter->pi_tree_entry); RB_CLEAR_NODE(&waiter->tree_entry); waiter->task = NULL; + waiter->savestate = savestate; } /** @@ -1167,7 +1572,8 @@ void rt_mutex_init_waiter(struct rt_mute static int __sched __rt_mutex_slowlock(struct rt_mutex *lock, int state, struct hrtimer_sleeper *timeout, - struct rt_mutex_waiter *waiter) + struct rt_mutex_waiter *waiter, + struct ww_acquire_ctx *ww_ctx) { int ret = 0; @@ -1176,16 +1582,17 @@ __rt_mutex_slowlock(struct rt_mutex *loc if (try_to_take_rt_mutex(lock, current, waiter)) break; - /* - * TASK_INTERRUPTIBLE checks for signals and - * timeout. Ignored otherwise. - */ - if (likely(state == TASK_INTERRUPTIBLE)) { - /* Signal pending? */ - if (signal_pending(current)) - ret = -EINTR; - if (timeout && !timeout->task) - ret = -ETIMEDOUT; + if (timeout && !timeout->task) { + ret = -ETIMEDOUT; + break; + } + if (signal_pending_state(state, current)) { + ret = -EINTR; + break; + } + + if (ww_ctx && ww_ctx->acquired > 0) { + ret = __mutex_lock_check_stamp(lock, ww_ctx); if (ret) break; } @@ -1224,33 +1631,104 @@ static void rt_mutex_handle_deadlock(int } } -/* - * Slow path lock function: - */ -static int __sched -rt_mutex_slowlock(struct rt_mutex *lock, int state, - struct hrtimer_sleeper *timeout, - enum rtmutex_chainwalk chwalk) +static __always_inline void ww_mutex_lock_acquired(struct ww_mutex *ww, + struct ww_acquire_ctx *ww_ctx) { - struct rt_mutex_waiter waiter; - unsigned long flags; - int ret = 0; +#ifdef CONFIG_DEBUG_MUTEXES + /* + * If this WARN_ON triggers, you used ww_mutex_lock to acquire, + * but released with a normal mutex_unlock in this call. + * + * This should never happen, always use ww_mutex_unlock. + */ + DEBUG_LOCKS_WARN_ON(ww->ctx); - rt_mutex_init_waiter(&waiter); + /* + * Not quite done after calling ww_acquire_done() ? + */ + DEBUG_LOCKS_WARN_ON(ww_ctx->done_acquire); + + if (ww_ctx->contending_lock) { + /* + * After -EDEADLK you tried to + * acquire a different ww_mutex? Bad! + */ + DEBUG_LOCKS_WARN_ON(ww_ctx->contending_lock != ww); + + /* + * You called ww_mutex_lock after receiving -EDEADLK, + * but 'forgot' to unlock everything else first? + */ + DEBUG_LOCKS_WARN_ON(ww_ctx->acquired > 0); + ww_ctx->contending_lock = NULL; + } /* - * Technically we could use raw_spin_[un]lock_irq() here, but this can - * be called in early boot if the cmpxchg() fast path is disabled - * (debug, no architecture support). In this case we will acquire the - * rtmutex with lock->wait_lock held. But we cannot unconditionally - * enable interrupts in that early boot case. So we need to use the - * irqsave/restore variants. + * Naughty, using a different class will lead to undefined behavior! */ - raw_spin_lock_irqsave(&lock->wait_lock, flags); + DEBUG_LOCKS_WARN_ON(ww_ctx->ww_class != ww->ww_class); +#endif + ww_ctx->acquired++; +} + +#ifdef CONFIG_PREEMPT_RT_FULL +static void ww_mutex_account_lock(struct rt_mutex *lock, + struct ww_acquire_ctx *ww_ctx) +{ + struct ww_mutex *ww = container_of(lock, struct ww_mutex, base.lock); + struct rt_mutex_waiter *waiter, *n; + + /* + * This branch gets optimized out for the common case, + * and is only important for ww_mutex_lock. + */ + ww_mutex_lock_acquired(ww, ww_ctx); + ww->ctx = ww_ctx; + + /* + * Give any possible sleeping processes the chance to wake up, + * so they can recheck if they have to back off. + */ + rbtree_postorder_for_each_entry_safe(waiter, n, &lock->waiters.rb_root, + tree_entry) { + /* XXX debug rt mutex waiter wakeup */ + + BUG_ON(waiter->lock != lock); + rt_mutex_wake_waiter(waiter); + } +} + +#else + +static void ww_mutex_account_lock(struct rt_mutex *lock, + struct ww_acquire_ctx *ww_ctx) +{ + BUG(); +} +#endif + +int __sched rt_mutex_slowlock_locked(struct rt_mutex *lock, int state, + struct hrtimer_sleeper *timeout, + enum rtmutex_chainwalk chwalk, + struct ww_acquire_ctx *ww_ctx, + struct rt_mutex_waiter *waiter) +{ + int ret; + +#ifdef CONFIG_PREEMPT_RT_FULL + if (ww_ctx) { + struct ww_mutex *ww; + + ww = container_of(lock, struct ww_mutex, base.lock); + if (unlikely(ww_ctx == READ_ONCE(ww->ctx))) + return -EALREADY; + } +#endif /* Try to acquire the lock again: */ if (try_to_take_rt_mutex(lock, current, NULL)) { - raw_spin_unlock_irqrestore(&lock->wait_lock, flags); + if (ww_ctx) + ww_mutex_account_lock(lock, ww_ctx); return 0; } @@ -1260,17 +1738,27 @@ rt_mutex_slowlock(struct rt_mutex *lock, if (unlikely(timeout)) hrtimer_start_expires(&timeout->timer, HRTIMER_MODE_ABS); - ret = task_blocks_on_rt_mutex(lock, &waiter, current, chwalk); + ret = task_blocks_on_rt_mutex(lock, waiter, current, chwalk); - if (likely(!ret)) + if (likely(!ret)) { /* sleep on the mutex */ - ret = __rt_mutex_slowlock(lock, state, timeout, &waiter); + ret = __rt_mutex_slowlock(lock, state, timeout, waiter, + ww_ctx); + } else if (ww_ctx) { + /* ww_mutex received EDEADLK, let it become EALREADY */ + ret = __mutex_lock_check_stamp(lock, ww_ctx); + BUG_ON(!ret); + } if (unlikely(ret)) { __set_current_state(TASK_RUNNING); if (rt_mutex_has_waiters(lock)) - remove_waiter(lock, &waiter); - rt_mutex_handle_deadlock(ret, chwalk, &waiter); + remove_waiter(lock, waiter); + /* ww_mutex want to report EDEADLK/EALREADY, let them */ + if (!ww_ctx) + rt_mutex_handle_deadlock(ret, chwalk, waiter); + } else if (ww_ctx) { + ww_mutex_account_lock(lock, ww_ctx); } /* @@ -1278,6 +1766,36 @@ rt_mutex_slowlock(struct rt_mutex *lock, * unconditionally. We might have to fix that up. */ fixup_rt_mutex_waiters(lock); + return ret; +} + +/* + * Slow path lock function: + */ +static int __sched +rt_mutex_slowlock(struct rt_mutex *lock, int state, + struct hrtimer_sleeper *timeout, + enum rtmutex_chainwalk chwalk, + struct ww_acquire_ctx *ww_ctx) +{ + struct rt_mutex_waiter waiter; + unsigned long flags; + int ret = 0; + + rt_mutex_init_waiter(&waiter, false); + + /* + * Technically we could use raw_spin_[un]lock_irq() here, but this can + * be called in early boot if the cmpxchg() fast path is disabled + * (debug, no architecture support). In this case we will acquire the + * rtmutex with lock->wait_lock held. But we cannot unconditionally + * enable interrupts in that early boot case. So we need to use the + * irqsave/restore variants. + */ + raw_spin_lock_irqsave(&lock->wait_lock, flags); + + ret = rt_mutex_slowlock_locked(lock, state, timeout, chwalk, ww_ctx, + &waiter); raw_spin_unlock_irqrestore(&lock->wait_lock, flags); @@ -1338,7 +1856,8 @@ static inline int rt_mutex_slowtrylock(s * Return whether the current task needs to call rt_mutex_postunlock(). */ static bool __sched rt_mutex_slowunlock(struct rt_mutex *lock, - struct wake_q_head *wake_q) + struct wake_q_head *wake_q, + struct wake_q_head *wake_sleeper_q) { unsigned long flags; @@ -1392,7 +1911,7 @@ static bool __sched rt_mutex_slowunlock( * * Queue the next waiter for wakeup once we release the wait_lock. */ - mark_wakeup_next_waiter(wake_q, lock); + mark_wakeup_next_waiter(wake_q, wake_sleeper_q, lock); raw_spin_unlock_irqrestore(&lock->wait_lock, flags); return true; /* call rt_mutex_postunlock() */ @@ -1406,29 +1925,45 @@ static bool __sched rt_mutex_slowunlock( */ static inline int rt_mutex_fastlock(struct rt_mutex *lock, int state, + struct ww_acquire_ctx *ww_ctx, int (*slowfn)(struct rt_mutex *lock, int state, struct hrtimer_sleeper *timeout, - enum rtmutex_chainwalk chwalk)) + enum rtmutex_chainwalk chwalk, + struct ww_acquire_ctx *ww_ctx)) { if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) return 0; - return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK); + /* + * If rt_mutex blocks, the function sched_submit_work will not call + * blk_schedule_flush_plug (because tsk_is_pi_blocked would be true). + * We must call blk_schedule_flush_plug here, if we don't call it, + * a deadlock in device mapper may happen. + */ + if (unlikely(blk_needs_flush_plug(current))) + blk_schedule_flush_plug(current); + + return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK, ww_ctx); } static inline int rt_mutex_timed_fastlock(struct rt_mutex *lock, int state, struct hrtimer_sleeper *timeout, enum rtmutex_chainwalk chwalk, + struct ww_acquire_ctx *ww_ctx, int (*slowfn)(struct rt_mutex *lock, int state, struct hrtimer_sleeper *timeout, - enum rtmutex_chainwalk chwalk)) + enum rtmutex_chainwalk chwalk, + struct ww_acquire_ctx *ww_ctx)) { if (chwalk == RT_MUTEX_MIN_CHAINWALK && likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) return 0; - return slowfn(lock, state, timeout, chwalk); + if (unlikely(blk_needs_flush_plug(current))) + blk_schedule_flush_plug(current); + + return slowfn(lock, state, timeout, chwalk, ww_ctx); } static inline int @@ -1444,9 +1979,11 @@ rt_mutex_fasttrylock(struct rt_mutex *lo /* * Performs the wakeup of the the top-waiter and re-enables preemption. */ -void rt_mutex_postunlock(struct wake_q_head *wake_q) +void rt_mutex_postunlock(struct wake_q_head *wake_q, + struct wake_q_head *wake_sleeper_q) { wake_up_q(wake_q); + wake_up_q_sleeper(wake_sleeper_q); /* Pairs with preempt_disable() in rt_mutex_slowunlock() */ preempt_enable(); @@ -1455,15 +1992,40 @@ void rt_mutex_postunlock(struct wake_q_h static inline void rt_mutex_fastunlock(struct rt_mutex *lock, bool (*slowfn)(struct rt_mutex *lock, - struct wake_q_head *wqh)) + struct wake_q_head *wqh, + struct wake_q_head *wq_sleeper)) { DEFINE_WAKE_Q(wake_q); + DEFINE_WAKE_Q(wake_sleeper_q); if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) return; - if (slowfn(lock, &wake_q)) - rt_mutex_postunlock(&wake_q); + if (slowfn(lock, &wake_q, &wake_sleeper_q)) + rt_mutex_postunlock(&wake_q, &wake_sleeper_q); +} + +int __sched __rt_mutex_lock_state(struct rt_mutex *lock, int state) +{ + might_sleep(); + return rt_mutex_fastlock(lock, state, NULL, rt_mutex_slowlock); +} + +/** + * rt_mutex_lock_state - lock a rt_mutex with a given state + * + * @lock: The rt_mutex to be locked + * @state: The state to set when blocking on the rt_mutex + */ +static int __sched rt_mutex_lock_state(struct rt_mutex *lock, int state) +{ + int ret; + + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); + ret = __rt_mutex_lock_state(lock, state); + if (ret) + mutex_release(&lock->dep_map, 1, _RET_IP_); + return ret; } /** @@ -1473,10 +2035,7 @@ rt_mutex_fastunlock(struct rt_mutex *loc */ void __sched rt_mutex_lock(struct rt_mutex *lock) { - might_sleep(); - - mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); - rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, rt_mutex_slowlock); + rt_mutex_lock_state(lock, TASK_UNINTERRUPTIBLE); } EXPORT_SYMBOL_GPL(rt_mutex_lock); @@ -1491,16 +2050,7 @@ EXPORT_SYMBOL_GPL(rt_mutex_lock); */ int __sched rt_mutex_lock_interruptible(struct rt_mutex *lock) { - int ret; - - might_sleep(); - - mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); - ret = rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE, rt_mutex_slowlock); - if (ret) - mutex_release(&lock->dep_map, 1, _RET_IP_); - - return ret; + return rt_mutex_lock_state(lock, TASK_INTERRUPTIBLE); } EXPORT_SYMBOL_GPL(rt_mutex_lock_interruptible); @@ -1518,6 +2068,22 @@ int __sched __rt_mutex_futex_trylock(str } /** + * rt_mutex_lock_killable - lock a rt_mutex killable + * + * @lock: the rt_mutex to be locked + * @detect_deadlock: deadlock detection on/off + * + * Returns: + * 0 on success + * -EINTR when interrupted by a signal + */ +int __sched rt_mutex_lock_killable(struct rt_mutex *lock) +{ + return rt_mutex_lock_state(lock, TASK_KILLABLE); +} +EXPORT_SYMBOL_GPL(rt_mutex_lock_killable); + +/** * rt_mutex_timed_lock - lock a rt_mutex interruptible * the timeout structure is provided * by the caller @@ -1540,6 +2106,7 @@ rt_mutex_timed_lock(struct rt_mutex *loc mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); ret = rt_mutex_timed_fastlock(lock, TASK_INTERRUPTIBLE, timeout, RT_MUTEX_MIN_CHAINWALK, + NULL, rt_mutex_slowlock); if (ret) mutex_release(&lock->dep_map, 1, _RET_IP_); @@ -1548,6 +2115,18 @@ rt_mutex_timed_lock(struct rt_mutex *loc } EXPORT_SYMBOL_GPL(rt_mutex_timed_lock); +int __sched __rt_mutex_trylock(struct rt_mutex *lock) +{ +#ifdef CONFIG_PREEMPT_RT_FULL + if (WARN_ON_ONCE(in_irq() || in_nmi())) +#else + if (WARN_ON_ONCE(in_irq() || in_nmi() || in_serving_softirq())) +#endif + return 0; + + return rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock); +} + /** * rt_mutex_trylock - try to lock a rt_mutex * @@ -1563,10 +2142,7 @@ int __sched rt_mutex_trylock(struct rt_m { int ret; - if (WARN_ON_ONCE(in_irq() || in_nmi() || in_serving_softirq())) - return 0; - - ret = rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock); + ret = __rt_mutex_trylock(lock); if (ret) mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_); @@ -1574,6 +2150,11 @@ int __sched rt_mutex_trylock(struct rt_m } EXPORT_SYMBOL_GPL(rt_mutex_trylock); +void __sched __rt_mutex_unlock(struct rt_mutex *lock) +{ + rt_mutex_fastunlock(lock, rt_mutex_slowunlock); +} + /** * rt_mutex_unlock - unlock a rt_mutex * @@ -1582,16 +2163,13 @@ EXPORT_SYMBOL_GPL(rt_mutex_trylock); void __sched rt_mutex_unlock(struct rt_mutex *lock) { mutex_release(&lock->dep_map, 1, _RET_IP_); - rt_mutex_fastunlock(lock, rt_mutex_slowunlock); + __rt_mutex_unlock(lock); } EXPORT_SYMBOL_GPL(rt_mutex_unlock); -/** - * Futex variant, that since futex variants do not use the fast-path, can be - * simple and will not need to retry. - */ -bool __sched __rt_mutex_futex_unlock(struct rt_mutex *lock, - struct wake_q_head *wake_q) +static bool __sched __rt_mutex_unlock_common(struct rt_mutex *lock, + struct wake_q_head *wake_q, + struct wake_q_head *wq_sleeper) { lockdep_assert_held(&lock->wait_lock); @@ -1608,22 +2186,35 @@ bool __sched __rt_mutex_futex_unlock(str * avoid inversion prior to the wakeup. preempt_disable() * therein pairs with rt_mutex_postunlock(). */ - mark_wakeup_next_waiter(wake_q, lock); + mark_wakeup_next_waiter(wake_q, wq_sleeper, lock); return true; /* call postunlock() */ } +/** + * Futex variant, that since futex variants do not use the fast-path, can be + * simple and will not need to retry. + */ +bool __sched __rt_mutex_futex_unlock(struct rt_mutex *lock, + struct wake_q_head *wake_q, + struct wake_q_head *wq_sleeper) +{ + return __rt_mutex_unlock_common(lock, wake_q, wq_sleeper); +} + void __sched rt_mutex_futex_unlock(struct rt_mutex *lock) { DEFINE_WAKE_Q(wake_q); + DEFINE_WAKE_Q(wake_sleeper_q); + unsigned long flags; bool postunlock; - raw_spin_lock_irq(&lock->wait_lock); - postunlock = __rt_mutex_futex_unlock(lock, &wake_q); - raw_spin_unlock_irq(&lock->wait_lock); + raw_spin_lock_irqsave(&lock->wait_lock, flags); + postunlock = __rt_mutex_futex_unlock(lock, &wake_q, &wake_sleeper_q); + raw_spin_unlock_irqrestore(&lock->wait_lock, flags); if (postunlock) - rt_mutex_postunlock(&wake_q); + rt_mutex_postunlock(&wake_q, &wake_sleeper_q); } /** @@ -1662,7 +2253,7 @@ void __rt_mutex_init(struct rt_mutex *lo if (name && key) debug_rt_mutex_init(lock, name, key); } -EXPORT_SYMBOL_GPL(__rt_mutex_init); +EXPORT_SYMBOL(__rt_mutex_init); /** * rt_mutex_init_proxy_locked - initialize and lock a rt_mutex on behalf of a @@ -1682,6 +2273,14 @@ void rt_mutex_init_proxy_locked(struct r struct task_struct *proxy_owner) { __rt_mutex_init(lock, NULL, NULL); +#ifdef CONFIG_DEBUG_SPINLOCK + /* + * get another key class for the wait_lock. LOCK_PI and UNLOCK_PI is + * holding the ->wait_lock of the proxy_lock while unlocking a sleeping + * lock. + */ + raw_spin_lock_init(&lock->wait_lock); +#endif debug_rt_mutex_proxy_lock(lock, proxy_owner); rt_mutex_set_owner(lock, proxy_owner); } @@ -1714,6 +2313,34 @@ int __rt_mutex_start_proxy_lock(struct r if (try_to_take_rt_mutex(lock, task, NULL)) return 1; +#ifdef CONFIG_PREEMPT_RT_FULL + /* + * In PREEMPT_RT there's an added race. + * If the task, that we are about to requeue, times out, + * it can set the PI_WAKEUP_INPROGRESS. This tells the requeue + * to skip this task. But right after the task sets + * its pi_blocked_on to PI_WAKEUP_INPROGRESS it can then + * block on the spin_lock(&hb->lock), which in RT is an rtmutex. + * This will replace the PI_WAKEUP_INPROGRESS with the actual + * lock that it blocks on. We *must not* place this task + * on this proxy lock in that case. + * + * To prevent this race, we first take the task's pi_lock + * and check if it has updated its pi_blocked_on. If it has, + * we assume that it woke up and we return -EAGAIN. + * Otherwise, we set the task's pi_blocked_on to + * PI_REQUEUE_INPROGRESS, so that if the task is waking up + * it will know that we are in the process of requeuing it. + */ + raw_spin_lock(&task->pi_lock); + if (task->pi_blocked_on) { + raw_spin_unlock(&task->pi_lock); + return -EAGAIN; + } + task->pi_blocked_on = PI_REQUEUE_INPROGRESS; + raw_spin_unlock(&task->pi_lock); +#endif + /* We enforce deadlock detection for futexes */ ret = task_blocks_on_rt_mutex(lock, waiter, task, RT_MUTEX_FULL_CHAINWALK); @@ -1728,7 +2355,7 @@ int __rt_mutex_start_proxy_lock(struct r ret = 0; } - if (unlikely(ret)) + if (ret && rt_mutex_has_waiters(lock)) remove_waiter(lock, waiter); debug_rt_mutex_print_deadlock(waiter); @@ -1803,17 +2430,36 @@ int rt_mutex_wait_proxy_lock(struct rt_m struct hrtimer_sleeper *to, struct rt_mutex_waiter *waiter) { + struct task_struct *tsk = current; int ret; raw_spin_lock_irq(&lock->wait_lock); /* sleep on the mutex */ set_current_state(TASK_INTERRUPTIBLE); - ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter); + ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter, NULL); /* * try_to_take_rt_mutex() sets the waiter bit unconditionally. We might * have to fix that up. */ fixup_rt_mutex_waiters(lock); + /* + * RT has a problem here when the wait got interrupted by a timeout + * or a signal. task->pi_blocked_on is still set. The task must + * acquire the hash bucket lock when returning from this function. + * + * If the hash bucket lock is contended then the + * BUG_ON(rt_mutex_real_waiter(task->pi_blocked_on)) in + * task_blocks_on_rt_mutex() will trigger. This can be avoided by + * clearing task->pi_blocked_on which removes the task from the + * boosting chain of the rtmutex. That's correct because the task + * is not longer blocked on it. + */ + if (ret) { + raw_spin_lock(&tsk->pi_lock); + tsk->pi_blocked_on = NULL; + raw_spin_unlock(&tsk->pi_lock); + } + raw_spin_unlock_irq(&lock->wait_lock); return ret; @@ -1874,3 +2520,99 @@ bool rt_mutex_cleanup_proxy_lock(struct return cleanup; } + +static inline int +ww_mutex_deadlock_injection(struct ww_mutex *lock, struct ww_acquire_ctx *ctx) +{ +#ifdef CONFIG_DEBUG_WW_MUTEX_SLOWPATH + unsigned tmp; + + if (ctx->deadlock_inject_countdown-- == 0) { + tmp = ctx->deadlock_inject_interval; + if (tmp > UINT_MAX/4) + tmp = UINT_MAX; + else + tmp = tmp*2 + tmp + tmp/2; + + ctx->deadlock_inject_interval = tmp; + ctx->deadlock_inject_countdown = tmp; + ctx->contending_lock = lock; + + ww_mutex_unlock(lock); + + return -EDEADLK; + } +#endif + + return 0; +} + +#ifdef CONFIG_PREEMPT_RT_FULL +int __sched +ww_mutex_lock_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ctx) +{ + int ret; + + might_sleep(); + + mutex_acquire_nest(&lock->base.dep_map, 0, 0, + ctx ? &ctx->dep_map : NULL, _RET_IP_); + ret = rt_mutex_slowlock(&lock->base.lock, TASK_INTERRUPTIBLE, NULL, 0, + ctx); + if (ret) + mutex_release(&lock->base.dep_map, 1, _RET_IP_); + else if (!ret && ctx && ctx->acquired > 1) + return ww_mutex_deadlock_injection(lock, ctx); + + return ret; +} +EXPORT_SYMBOL_GPL(ww_mutex_lock_interruptible); + +int __sched +ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ctx) +{ + int ret; + + might_sleep(); + + mutex_acquire_nest(&lock->base.dep_map, 0, 0, + ctx ? &ctx->dep_map : NULL, _RET_IP_); + ret = rt_mutex_slowlock(&lock->base.lock, TASK_UNINTERRUPTIBLE, NULL, 0, + ctx); + if (ret) + mutex_release(&lock->base.dep_map, 1, _RET_IP_); + else if (!ret && ctx && ctx->acquired > 1) + return ww_mutex_deadlock_injection(lock, ctx); + + return ret; +} +EXPORT_SYMBOL_GPL(ww_mutex_lock); + +void __sched ww_mutex_unlock(struct ww_mutex *lock) +{ + int nest = !!lock->ctx; + + /* + * The unlocking fastpath is the 0->1 transition from 'locked' + * into 'unlocked' state: + */ + if (nest) { +#ifdef CONFIG_DEBUG_MUTEXES + DEBUG_LOCKS_WARN_ON(!lock->ctx->acquired); +#endif + if (lock->ctx->acquired > 0) + lock->ctx->acquired--; + lock->ctx = NULL; + } + + mutex_release(&lock->base.dep_map, nest, _RET_IP_); + __rt_mutex_unlock(&lock->base.lock); +} +EXPORT_SYMBOL(ww_mutex_unlock); + +int __rt_mutex_owner_current(struct rt_mutex *lock) +{ + return rt_mutex_owner(lock) == current; +} +EXPORT_SYMBOL(__rt_mutex_owner_current); +#endif Index: linux-4.14.15-rt12/kernel/locking/rtmutex_common.h =================================================================== --- linux-4.14.15-rt12.orig/kernel/locking/rtmutex_common.h +++ linux-4.14.15-rt12/kernel/locking/rtmutex_common.h @@ -15,6 +15,7 @@ #include #include +#include /* * This is the control structure for tasks blocked on a rt_mutex, @@ -29,6 +30,7 @@ struct rt_mutex_waiter { struct rb_node pi_tree_entry; struct task_struct *task; struct rt_mutex *lock; + bool savestate; #ifdef CONFIG_DEBUG_RT_MUTEXES unsigned long ip; struct pid *deadlock_task_pid; @@ -129,12 +131,15 @@ enum rtmutex_chainwalk { /* * PI-futex support (proxy locking functions, etc.): */ +#define PI_WAKEUP_INPROGRESS ((struct rt_mutex_waiter *) 1) +#define PI_REQUEUE_INPROGRESS ((struct rt_mutex_waiter *) 2) + extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock); extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock, struct task_struct *proxy_owner); extern void rt_mutex_proxy_unlock(struct rt_mutex *lock, struct task_struct *proxy_owner); -extern void rt_mutex_init_waiter(struct rt_mutex_waiter *waiter); +extern void rt_mutex_init_waiter(struct rt_mutex_waiter *waiter, bool savetate); extern int __rt_mutex_start_proxy_lock(struct rt_mutex *lock, struct rt_mutex_waiter *waiter, struct task_struct *task); @@ -152,9 +157,27 @@ extern int __rt_mutex_futex_trylock(stru extern void rt_mutex_futex_unlock(struct rt_mutex *lock); extern bool __rt_mutex_futex_unlock(struct rt_mutex *lock, - struct wake_q_head *wqh); + struct wake_q_head *wqh, + struct wake_q_head *wq_sleeper); + +extern void rt_mutex_postunlock(struct wake_q_head *wake_q, + struct wake_q_head *wake_sleeper_q); + +/* RW semaphore special interface */ +struct ww_acquire_ctx; -extern void rt_mutex_postunlock(struct wake_q_head *wake_q); +extern int __rt_mutex_lock_state(struct rt_mutex *lock, int state); +extern int __rt_mutex_trylock(struct rt_mutex *lock); +extern void __rt_mutex_unlock(struct rt_mutex *lock); +int __sched rt_mutex_slowlock_locked(struct rt_mutex *lock, int state, + struct hrtimer_sleeper *timeout, + enum rtmutex_chainwalk chwalk, + struct ww_acquire_ctx *ww_ctx, + struct rt_mutex_waiter *waiter); +void __sched rt_spin_lock_slowlock_locked(struct rt_mutex *lock, + struct rt_mutex_waiter *waiter, + unsigned long flags); +void __sched rt_spin_lock_slowunlock(struct rt_mutex *lock); #ifdef CONFIG_DEBUG_RT_MUTEXES # include "rtmutex-debug.h" Index: linux-4.14.15-rt12/kernel/locking/rwlock-rt.c =================================================================== --- /dev/null +++ linux-4.14.15-rt12/kernel/locking/rwlock-rt.c @@ -0,0 +1,368 @@ +/* + */ +#include +#include + +#include "rtmutex_common.h" +#include + +/* + * RT-specific reader/writer locks + * + * write_lock() + * 1) Lock lock->rtmutex + * 2) Remove the reader BIAS to force readers into the slow path + * 3) Wait until all readers have left the critical region + * 4) Mark it write locked + * + * write_unlock() + * 1) Remove the write locked marker + * 2) Set the reader BIAS so readers can use the fast path again + * 3) Unlock lock->rtmutex to release blocked readers + * + * read_lock() + * 1) Try fast path acquisition (reader BIAS is set) + * 2) Take lock->rtmutex.wait_lock which protects the writelocked flag + * 3) If !writelocked, acquire it for read + * 4) If writelocked, block on lock->rtmutex + * 5) unlock lock->rtmutex, goto 1) + * + * read_unlock() + * 1) Try fast path release (reader count != 1) + * 2) Wake the writer waiting in write_lock()#3 + * + * read_lock()#3 has the consequence, that rw locks on RT are not writer + * fair, but writers, which should be avoided in RT tasks (think tasklist + * lock), are subject to the rtmutex priority/DL inheritance mechanism. + * + * It's possible to make the rw locks writer fair by keeping a list of + * active readers. A blocked writer would force all newly incoming readers + * to block on the rtmutex, but the rtmutex would have to be proxy locked + * for one reader after the other. We can't use multi-reader inheritance + * because there is no way to support that with + * SCHED_DEADLINE. Implementing the one by one reader boosting/handover + * mechanism is a major surgery for a very dubious value. + * + * The risk of writer starvation is there, but the pathological use cases + * which trigger it are not necessarily the typical RT workloads. + */ + +void __rwlock_biased_rt_init(struct rt_rw_lock *lock, const char *name, + struct lock_class_key *key) +{ +#ifdef CONFIG_DEBUG_LOCK_ALLOC + /* + * Make sure we are not reinitializing a held semaphore: + */ + debug_check_no_locks_freed((void *)lock, sizeof(*lock)); + lockdep_init_map(&lock->dep_map, name, key, 0); +#endif + atomic_set(&lock->readers, READER_BIAS); + rt_mutex_init(&lock->rtmutex); + lock->rtmutex.save_state = 1; +} + +int __read_rt_trylock(struct rt_rw_lock *lock) +{ + int r, old; + + /* + * Increment reader count, if lock->readers < 0, i.e. READER_BIAS is + * set. + */ + for (r = atomic_read(&lock->readers); r < 0;) { + old = atomic_cmpxchg(&lock->readers, r, r + 1); + if (likely(old == r)) + return 1; + r = old; + } + return 0; +} + +void __sched __read_rt_lock(struct rt_rw_lock *lock) +{ + struct rt_mutex *m = &lock->rtmutex; + struct rt_mutex_waiter waiter; + unsigned long flags; + + if (__read_rt_trylock(lock)) + return; + + raw_spin_lock_irqsave(&m->wait_lock, flags); + /* + * Allow readers as long as the writer has not completely + * acquired the semaphore for write. + */ + if (atomic_read(&lock->readers) != WRITER_BIAS) { + atomic_inc(&lock->readers); + raw_spin_unlock_irqrestore(&m->wait_lock, flags); + return; + } + + /* + * Call into the slow lock path with the rtmutex->wait_lock + * held, so this can't result in the following race: + * + * Reader1 Reader2 Writer + * read_lock() + * write_lock() + * rtmutex_lock(m) + * swait() + * read_lock() + * unlock(m->wait_lock) + * read_unlock() + * swake() + * lock(m->wait_lock) + * lock->writelocked=true + * unlock(m->wait_lock) + * + * write_unlock() + * lock->writelocked=false + * rtmutex_unlock(m) + * read_lock() + * write_lock() + * rtmutex_lock(m) + * swait() + * rtmutex_lock(m) + * + * That would put Reader1 behind the writer waiting on + * Reader2 to call read_unlock() which might be unbound. + */ + rt_mutex_init_waiter(&waiter, false); + rt_spin_lock_slowlock_locked(m, &waiter, flags); + /* + * The slowlock() above is guaranteed to return with the rtmutex is + * now held, so there can't be a writer active. Increment the reader + * count and immediately drop the rtmutex again. + */ + atomic_inc(&lock->readers); + raw_spin_unlock_irqrestore(&m->wait_lock, flags); + rt_spin_lock_slowunlock(m); + + debug_rt_mutex_free_waiter(&waiter); +} + +void __read_rt_unlock(struct rt_rw_lock *lock) +{ + struct rt_mutex *m = &lock->rtmutex; + struct task_struct *tsk; + + /* + * sem->readers can only hit 0 when a writer is waiting for the + * active readers to leave the critical region. + */ + if (!atomic_dec_and_test(&lock->readers)) + return; + + raw_spin_lock_irq(&m->wait_lock); + /* + * Wake the writer, i.e. the rtmutex owner. It might release the + * rtmutex concurrently in the fast path, but to clean up the rw + * lock it needs to acquire m->wait_lock. The worst case which can + * happen is a spurious wakeup. + */ + tsk = rt_mutex_owner(m); + if (tsk) + wake_up_process(tsk); + + raw_spin_unlock_irq(&m->wait_lock); +} + +static void __write_unlock_common(struct rt_rw_lock *lock, int bias, + unsigned long flags) +{ + struct rt_mutex *m = &lock->rtmutex; + + atomic_add(READER_BIAS - bias, &lock->readers); + raw_spin_unlock_irqrestore(&m->wait_lock, flags); + rt_spin_lock_slowunlock(m); +} + +void __sched __write_rt_lock(struct rt_rw_lock *lock) +{ + struct rt_mutex *m = &lock->rtmutex; + struct task_struct *self = current; + unsigned long flags; + + /* Take the rtmutex as a first step */ + __rt_spin_lock(m); + + /* Force readers into slow path */ + atomic_sub(READER_BIAS, &lock->readers); + + raw_spin_lock_irqsave(&m->wait_lock, flags); + + raw_spin_lock(&self->pi_lock); + self->saved_state = self->state; + __set_current_state_no_track(TASK_UNINTERRUPTIBLE); + raw_spin_unlock(&self->pi_lock); + + for (;;) { + /* Have all readers left the critical region? */ + if (!atomic_read(&lock->readers)) { + atomic_set(&lock->readers, WRITER_BIAS); + raw_spin_lock(&self->pi_lock); + __set_current_state_no_track(self->saved_state); + self->saved_state = TASK_RUNNING; + raw_spin_unlock(&self->pi_lock); + raw_spin_unlock_irqrestore(&m->wait_lock, flags); + return; + } + + raw_spin_unlock_irqrestore(&m->wait_lock, flags); + + if (atomic_read(&lock->readers) != 0) + schedule(); + + raw_spin_lock_irqsave(&m->wait_lock, flags); + + raw_spin_lock(&self->pi_lock); + __set_current_state_no_track(TASK_UNINTERRUPTIBLE); + raw_spin_unlock(&self->pi_lock); + } +} + +int __write_rt_trylock(struct rt_rw_lock *lock) +{ + struct rt_mutex *m = &lock->rtmutex; + unsigned long flags; + + if (!__rt_mutex_trylock(m)) + return 0; + + atomic_sub(READER_BIAS, &lock->readers); + + raw_spin_lock_irqsave(&m->wait_lock, flags); + if (!atomic_read(&lock->readers)) { + atomic_set(&lock->readers, WRITER_BIAS); + raw_spin_unlock_irqrestore(&m->wait_lock, flags); + return 1; + } + __write_unlock_common(lock, 0, flags); + return 0; +} + +void __write_rt_unlock(struct rt_rw_lock *lock) +{ + struct rt_mutex *m = &lock->rtmutex; + unsigned long flags; + + raw_spin_lock_irqsave(&m->wait_lock, flags); + __write_unlock_common(lock, WRITER_BIAS, flags); +} + +/* Map the reader biased implementation */ +static inline int do_read_rt_trylock(rwlock_t *rwlock) +{ + return __read_rt_trylock(rwlock); +} + +static inline int do_write_rt_trylock(rwlock_t *rwlock) +{ + return __write_rt_trylock(rwlock); +} + +static inline void do_read_rt_lock(rwlock_t *rwlock) +{ + __read_rt_lock(rwlock); +} + +static inline void do_write_rt_lock(rwlock_t *rwlock) +{ + __write_rt_lock(rwlock); +} + +static inline void do_read_rt_unlock(rwlock_t *rwlock) +{ + __read_rt_unlock(rwlock); +} + +static inline void do_write_rt_unlock(rwlock_t *rwlock) +{ + __write_rt_unlock(rwlock); +} + +static inline void do_rwlock_rt_init(rwlock_t *rwlock, const char *name, + struct lock_class_key *key) +{ + __rwlock_biased_rt_init(rwlock, name, key); +} + +int __lockfunc rt_read_can_lock(rwlock_t *rwlock) +{ + return atomic_read(&rwlock->readers) < 0; +} + +int __lockfunc rt_write_can_lock(rwlock_t *rwlock) +{ + return atomic_read(&rwlock->readers) == READER_BIAS; +} + +/* + * The common functions which get wrapped into the rwlock API. + */ +int __lockfunc rt_read_trylock(rwlock_t *rwlock) +{ + int ret; + + migrate_disable(); + ret = do_read_rt_trylock(rwlock); + if (ret) + rwlock_acquire_read(&rwlock->dep_map, 0, 1, _RET_IP_); + else + migrate_enable(); + return ret; +} +EXPORT_SYMBOL(rt_read_trylock); + +int __lockfunc rt_write_trylock(rwlock_t *rwlock) +{ + int ret; + + migrate_disable(); + ret = do_write_rt_trylock(rwlock); + if (ret) + rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_); + else + migrate_enable(); + return ret; +} +EXPORT_SYMBOL(rt_write_trylock); + +void __lockfunc rt_read_lock(rwlock_t *rwlock) +{ + migrate_disable(); + rwlock_acquire_read(&rwlock->dep_map, 0, 0, _RET_IP_); + do_read_rt_lock(rwlock); +} +EXPORT_SYMBOL(rt_read_lock); + +void __lockfunc rt_write_lock(rwlock_t *rwlock) +{ + migrate_disable(); + rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_); + do_write_rt_lock(rwlock); +} +EXPORT_SYMBOL(rt_write_lock); + +void __lockfunc rt_read_unlock(rwlock_t *rwlock) +{ + rwlock_release(&rwlock->dep_map, 1, _RET_IP_); + do_read_rt_unlock(rwlock); + migrate_enable(); +} +EXPORT_SYMBOL(rt_read_unlock); + +void __lockfunc rt_write_unlock(rwlock_t *rwlock) +{ + rwlock_release(&rwlock->dep_map, 1, _RET_IP_); + do_write_rt_unlock(rwlock); + migrate_enable(); +} +EXPORT_SYMBOL(rt_write_unlock); + +void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key) +{ + do_rwlock_rt_init(rwlock, name, key); +} +EXPORT_SYMBOL(__rt_rwlock_init); Index: linux-4.14.15-rt12/kernel/locking/rwsem-rt.c =================================================================== --- /dev/null +++ linux-4.14.15-rt12/kernel/locking/rwsem-rt.c @@ -0,0 +1,269 @@ +/* + */ +#include +#include +#include +#include + +#include "rtmutex_common.h" + +/* + * RT-specific reader/writer semaphores + * + * down_write() + * 1) Lock sem->rtmutex + * 2) Remove the reader BIAS to force readers into the slow path + * 3) Wait until all readers have left the critical region + * 4) Mark it write locked + * + * up_write() + * 1) Remove the write locked marker + * 2) Set the reader BIAS so readers can use the fast path again + * 3) Unlock sem->rtmutex to release blocked readers + * + * down_read() + * 1) Try fast path acquisition (reader BIAS is set) + * 2) Take sem->rtmutex.wait_lock which protects the writelocked flag + * 3) If !writelocked, acquire it for read + * 4) If writelocked, block on sem->rtmutex + * 5) unlock sem->rtmutex, goto 1) + * + * up_read() + * 1) Try fast path release (reader count != 1) + * 2) Wake the writer waiting in down_write()#3 + * + * down_read()#3 has the consequence, that rw semaphores on RT are not writer + * fair, but writers, which should be avoided in RT tasks (think mmap_sem), + * are subject to the rtmutex priority/DL inheritance mechanism. + * + * It's possible to make the rw semaphores writer fair by keeping a list of + * active readers. A blocked writer would force all newly incoming readers to + * block on the rtmutex, but the rtmutex would have to be proxy locked for one + * reader after the other. We can't use multi-reader inheritance because there + * is no way to support that with SCHED_DEADLINE. Implementing the one by one + * reader boosting/handover mechanism is a major surgery for a very dubious + * value. + * + * The risk of writer starvation is there, but the pathological use cases + * which trigger it are not necessarily the typical RT workloads. + */ + +void __rwsem_init(struct rw_semaphore *sem, const char *name, + struct lock_class_key *key) +{ +#ifdef CONFIG_DEBUG_LOCK_ALLOC + /* + * Make sure we are not reinitializing a held semaphore: + */ + debug_check_no_locks_freed((void *)sem, sizeof(*sem)); + lockdep_init_map(&sem->dep_map, name, key, 0); +#endif + atomic_set(&sem->readers, READER_BIAS); +} +EXPORT_SYMBOL(__rwsem_init); + +int __down_read_trylock(struct rw_semaphore *sem) +{ + int r, old; + + /* + * Increment reader count, if sem->readers < 0, i.e. READER_BIAS is + * set. + */ + for (r = atomic_read(&sem->readers); r < 0;) { + old = atomic_cmpxchg(&sem->readers, r, r + 1); + if (likely(old == r)) + return 1; + r = old; + } + return 0; +} + +void __sched __down_read(struct rw_semaphore *sem) +{ + struct rt_mutex *m = &sem->rtmutex; + struct rt_mutex_waiter waiter; + + if (__down_read_trylock(sem)) + return; + + might_sleep(); + raw_spin_lock_irq(&m->wait_lock); + /* + * Allow readers as long as the writer has not completely + * acquired the semaphore for write. + */ + if (atomic_read(&sem->readers) != WRITER_BIAS) { + atomic_inc(&sem->readers); + raw_spin_unlock_irq(&m->wait_lock); + return; + } + + /* + * Call into the slow lock path with the rtmutex->wait_lock + * held, so this can't result in the following race: + * + * Reader1 Reader2 Writer + * down_read() + * down_write() + * rtmutex_lock(m) + * swait() + * down_read() + * unlock(m->wait_lock) + * up_read() + * swake() + * lock(m->wait_lock) + * sem->writelocked=true + * unlock(m->wait_lock) + * + * up_write() + * sem->writelocked=false + * rtmutex_unlock(m) + * down_read() + * down_write() + * rtmutex_lock(m) + * swait() + * rtmutex_lock(m) + * + * That would put Reader1 behind the writer waiting on + * Reader2 to call up_read() which might be unbound. + */ + rt_mutex_init_waiter(&waiter, false); + rt_mutex_slowlock_locked(m, TASK_UNINTERRUPTIBLE, NULL, + RT_MUTEX_MIN_CHAINWALK, NULL, + &waiter); + /* + * The slowlock() above is guaranteed to return with the rtmutex is + * now held, so there can't be a writer active. Increment the reader + * count and immediately drop the rtmutex again. + */ + atomic_inc(&sem->readers); + raw_spin_unlock_irq(&m->wait_lock); + __rt_mutex_unlock(m); + + debug_rt_mutex_free_waiter(&waiter); +} + +void __up_read(struct rw_semaphore *sem) +{ + struct rt_mutex *m = &sem->rtmutex; + struct task_struct *tsk; + + /* + * sem->readers can only hit 0 when a writer is waiting for the + * active readers to leave the critical region. + */ + if (!atomic_dec_and_test(&sem->readers)) + return; + + might_sleep(); + raw_spin_lock_irq(&m->wait_lock); + /* + * Wake the writer, i.e. the rtmutex owner. It might release the + * rtmutex concurrently in the fast path (due to a signal), but to + * clean up the rwsem it needs to acquire m->wait_lock. The worst + * case which can happen is a spurious wakeup. + */ + tsk = rt_mutex_owner(m); + if (tsk) + wake_up_process(tsk); + + raw_spin_unlock_irq(&m->wait_lock); +} + +static void __up_write_unlock(struct rw_semaphore *sem, int bias, + unsigned long flags) +{ + struct rt_mutex *m = &sem->rtmutex; + + atomic_add(READER_BIAS - bias, &sem->readers); + raw_spin_unlock_irqrestore(&m->wait_lock, flags); + __rt_mutex_unlock(m); +} + +static int __sched __down_write_common(struct rw_semaphore *sem, int state) +{ + struct rt_mutex *m = &sem->rtmutex; + unsigned long flags; + + /* Take the rtmutex as a first step */ + if (__rt_mutex_lock_state(m, state)) + return -EINTR; + + /* Force readers into slow path */ + atomic_sub(READER_BIAS, &sem->readers); + might_sleep(); + + set_current_state(state); + for (;;) { + raw_spin_lock_irqsave(&m->wait_lock, flags); + /* Have all readers left the critical region? */ + if (!atomic_read(&sem->readers)) { + atomic_set(&sem->readers, WRITER_BIAS); + __set_current_state(TASK_RUNNING); + raw_spin_unlock_irqrestore(&m->wait_lock, flags); + return 0; + } + + if (signal_pending_state(state, current)) { + __set_current_state(TASK_RUNNING); + __up_write_unlock(sem, 0, flags); + return -EINTR; + } + raw_spin_unlock_irqrestore(&m->wait_lock, flags); + + if (atomic_read(&sem->readers) != 0) { + schedule(); + set_current_state(state); + } + } +} + +void __sched __down_write(struct rw_semaphore *sem) +{ + __down_write_common(sem, TASK_UNINTERRUPTIBLE); +} + +int __sched __down_write_killable(struct rw_semaphore *sem) +{ + return __down_write_common(sem, TASK_KILLABLE); +} + +int __down_write_trylock(struct rw_semaphore *sem) +{ + struct rt_mutex *m = &sem->rtmutex; + unsigned long flags; + + if (!__rt_mutex_trylock(m)) + return 0; + + atomic_sub(READER_BIAS, &sem->readers); + + raw_spin_lock_irqsave(&m->wait_lock, flags); + if (!atomic_read(&sem->readers)) { + atomic_set(&sem->readers, WRITER_BIAS); + raw_spin_unlock_irqrestore(&m->wait_lock, flags); + return 1; + } + __up_write_unlock(sem, 0, flags); + return 0; +} + +void __up_write(struct rw_semaphore *sem) +{ + struct rt_mutex *m = &sem->rtmutex; + unsigned long flags; + + raw_spin_lock_irqsave(&m->wait_lock, flags); + __up_write_unlock(sem, WRITER_BIAS, flags); +} + +void __downgrade_write(struct rw_semaphore *sem) +{ + struct rt_mutex *m = &sem->rtmutex; + unsigned long flags; + + raw_spin_lock_irqsave(&m->wait_lock, flags); + /* Release it and account current as reader */ + __up_write_unlock(sem, WRITER_BIAS - 1, flags); +} Index: linux-4.14.15-rt12/kernel/locking/spinlock.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/locking/spinlock.c +++ linux-4.14.15-rt12/kernel/locking/spinlock.c @@ -125,8 +125,11 @@ void __lockfunc __raw_##op##_lock_bh(loc * __[spin|read|write]_lock_bh() */ BUILD_LOCK_OPS(spin, raw_spinlock); + +#ifndef CONFIG_PREEMPT_RT_FULL BUILD_LOCK_OPS(read, rwlock); BUILD_LOCK_OPS(write, rwlock); +#endif #endif @@ -210,6 +213,8 @@ void __lockfunc _raw_spin_unlock_bh(raw_ EXPORT_SYMBOL(_raw_spin_unlock_bh); #endif +#ifndef CONFIG_PREEMPT_RT_FULL + #ifndef CONFIG_INLINE_READ_TRYLOCK int __lockfunc _raw_read_trylock(rwlock_t *lock) { @@ -354,6 +359,8 @@ void __lockfunc _raw_write_unlock_bh(rwl EXPORT_SYMBOL(_raw_write_unlock_bh); #endif +#endif /* !PREEMPT_RT_FULL */ + #ifdef CONFIG_DEBUG_LOCK_ALLOC void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass) Index: linux-4.14.15-rt12/kernel/locking/spinlock_debug.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/locking/spinlock_debug.c +++ linux-4.14.15-rt12/kernel/locking/spinlock_debug.c @@ -31,6 +31,7 @@ void __raw_spin_lock_init(raw_spinlock_t EXPORT_SYMBOL(__raw_spin_lock_init); +#ifndef CONFIG_PREEMPT_RT_FULL void __rwlock_init(rwlock_t *lock, const char *name, struct lock_class_key *key) { @@ -48,6 +49,7 @@ void __rwlock_init(rwlock_t *lock, const } EXPORT_SYMBOL(__rwlock_init); +#endif static void spin_dump(raw_spinlock_t *lock, const char *msg) { @@ -135,6 +137,7 @@ void do_raw_spin_unlock(raw_spinlock_t * arch_spin_unlock(&lock->raw_lock); } +#ifndef CONFIG_PREEMPT_RT_FULL static void rwlock_bug(rwlock_t *lock, const char *msg) { if (!debug_locks_off()) @@ -224,3 +227,5 @@ void do_raw_write_unlock(rwlock_t *lock) debug_write_unlock(lock); arch_write_unlock(&lock->raw_lock); } + +#endif Index: linux-4.14.15-rt12/kernel/panic.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/panic.c +++ linux-4.14.15-rt12/kernel/panic.c @@ -482,9 +482,11 @@ static u64 oops_id; static int init_oops_id(void) { +#ifndef CONFIG_PREEMPT_RT_FULL if (!oops_id) get_random_bytes(&oops_id, sizeof(oops_id)); else +#endif oops_id++; return 0; Index: linux-4.14.15-rt12/kernel/power/hibernate.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/power/hibernate.c +++ linux-4.14.15-rt12/kernel/power/hibernate.c @@ -287,6 +287,8 @@ static int create_image(int platform_mod local_irq_disable(); + system_state = SYSTEM_SUSPEND; + error = syscore_suspend(); if (error) { pr_err("Some system devices failed to power down, aborting hibernation\n"); @@ -317,6 +319,7 @@ static int create_image(int platform_mod syscore_resume(); Enable_irqs: + system_state = SYSTEM_RUNNING; local_irq_enable(); Enable_cpus: @@ -445,6 +448,7 @@ static int resume_target_kernel(bool pla goto Enable_cpus; local_irq_disable(); + system_state = SYSTEM_SUSPEND; error = syscore_suspend(); if (error) @@ -478,6 +482,7 @@ static int resume_target_kernel(bool pla syscore_resume(); Enable_irqs: + system_state = SYSTEM_RUNNING; local_irq_enable(); Enable_cpus: @@ -563,6 +568,7 @@ int hibernation_platform_enter(void) goto Enable_cpus; local_irq_disable(); + system_state = SYSTEM_SUSPEND; syscore_suspend(); if (pm_wakeup_pending()) { error = -EAGAIN; @@ -575,6 +581,7 @@ int hibernation_platform_enter(void) Power_up: syscore_resume(); + system_state = SYSTEM_RUNNING; local_irq_enable(); Enable_cpus: @@ -672,6 +679,10 @@ static int load_image_and_restore(void) return error; } +#ifndef CONFIG_SUSPEND +bool pm_in_action; +#endif + /** * hibernate - Carry out system hibernation, including saving the image. */ @@ -685,6 +696,8 @@ int hibernate(void) return -EPERM; } + pm_in_action = true; + lock_system_sleep(); /* The snapshot device should not be opened while we're running */ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { @@ -763,6 +776,7 @@ int hibernate(void) atomic_inc(&snapshot_device_available); Unlock: unlock_system_sleep(); + pm_in_action = false; pr_info("hibernation exit\n"); return error; Index: linux-4.14.15-rt12/kernel/power/suspend.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/power/suspend.c +++ linux-4.14.15-rt12/kernel/power/suspend.c @@ -428,6 +428,8 @@ static int suspend_enter(suspend_state_t arch_suspend_disable_irqs(); BUG_ON(!irqs_disabled()); + system_state = SYSTEM_SUSPEND; + error = syscore_suspend(); if (!error) { *wakeup = pm_wakeup_pending(); @@ -443,6 +445,8 @@ static int suspend_enter(suspend_state_t syscore_resume(); } + system_state = SYSTEM_RUNNING; + arch_suspend_enable_irqs(); BUG_ON(irqs_disabled()); @@ -589,6 +593,8 @@ static int enter_state(suspend_state_t s return error; } +bool pm_in_action; + /** * pm_suspend - Externally visible function for suspending the system. * @state: System sleep state to enter. @@ -603,6 +609,7 @@ int pm_suspend(suspend_state_t state) if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) return -EINVAL; + pm_in_action = true; pr_info("suspend entry (%s)\n", mem_sleep_labels[state]); error = enter_state(state); if (error) { @@ -612,6 +619,7 @@ int pm_suspend(suspend_state_t state) suspend_stats.success++; } pr_info("suspend exit\n"); + pm_in_action = false; return error; } EXPORT_SYMBOL(pm_suspend); Index: linux-4.14.15-rt12/kernel/printk/printk.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/printk/printk.c +++ linux-4.14.15-rt12/kernel/printk/printk.c @@ -400,6 +400,65 @@ DEFINE_RAW_SPINLOCK(logbuf_lock); printk_safe_exit_irqrestore(flags); \ } while (0) +#ifdef CONFIG_EARLY_PRINTK +struct console *early_console; + +static void early_vprintk(const char *fmt, va_list ap) +{ + if (early_console) { + char buf[512]; + int n = vscnprintf(buf, sizeof(buf), fmt, ap); + + early_console->write(early_console, buf, n); + } +} + +asmlinkage void early_printk(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + early_vprintk(fmt, ap); + va_end(ap); +} + +/* + * This is independent of any log levels - a global + * kill switch that turns off all of printk. + * + * Used by the NMI watchdog if early-printk is enabled. + */ +static bool __read_mostly printk_killswitch; + +static int __init force_early_printk_setup(char *str) +{ + printk_killswitch = true; + return 0; +} +early_param("force_early_printk", force_early_printk_setup); + +void printk_kill(void) +{ + printk_killswitch = true; +} + +#ifdef CONFIG_PRINTK +static int forced_early_printk(const char *fmt, va_list ap) +{ + if (!printk_killswitch) + return 0; + early_vprintk(fmt, ap); + return 1; +} +#endif + +#else +static inline int forced_early_printk(const char *fmt, va_list ap) +{ + return 0; +} +#endif + #ifdef CONFIG_PRINTK DECLARE_WAIT_QUEUE_HEAD(log_wait); /* the next printk record to read by syslog(READ) or /proc/kmsg */ @@ -1348,6 +1407,8 @@ static int syslog_print_all(char __user { char *text; int len = 0; + int attempts = 0; + int num_msg; text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL); if (!text) @@ -1359,6 +1420,14 @@ static int syslog_print_all(char __user u64 seq; u32 idx; +try_again: + attempts++; + if (attempts > 10) { + len = -EBUSY; + goto out; + } + num_msg = 0; + /* * Find first record that fits, including all following records, * into the user-provided buffer for this dump. @@ -1371,6 +1440,14 @@ static int syslog_print_all(char __user len += msg_print_text(msg, true, NULL, 0); idx = log_next(idx); seq++; + num_msg++; + if (num_msg > 5) { + num_msg = 0; + logbuf_unlock_irq(); + logbuf_lock_irq(); + if (clear_seq < log_first_seq) + goto try_again; + } } /* move first record forward until length fits into the buffer */ @@ -1382,6 +1459,14 @@ static int syslog_print_all(char __user len -= msg_print_text(msg, true, NULL, 0); idx = log_next(idx); seq++; + num_msg++; + if (num_msg > 5) { + num_msg = 0; + logbuf_unlock_irq(); + logbuf_lock_irq(); + if (clear_seq < log_first_seq) + goto try_again; + } } /* last message fitting into this dump */ @@ -1420,6 +1505,7 @@ static int syslog_print_all(char __user clear_seq = log_next_seq; clear_idx = log_next_idx; } +out: logbuf_unlock_irq(); kfree(text); @@ -1558,6 +1644,12 @@ static void call_console_drivers(const c if (!console_drivers) return; + if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) { + if (in_irq() || in_nmi()) + return; + } + + migrate_disable(); for_each_console(con) { if (exclusive_console && con != exclusive_console) continue; @@ -1573,6 +1665,7 @@ static void call_console_drivers(const c else con->write(con, text, len); } + migrate_enable(); } int printk_delay_msec __read_mostly; @@ -1692,6 +1785,13 @@ asmlinkage int vprintk_emit(int facility int printed_len; bool in_sched = false; + /* + * Fall back to early_printk if a debugging subsystem has + * killed printk output + */ + if (unlikely(forced_early_printk(fmt, args))) + return 1; + if (level == LOGLEVEL_SCHED) { level = LOGLEVEL_DEFAULT; in_sched = true; @@ -1748,12 +1848,22 @@ asmlinkage int vprintk_emit(int facility /* If called from the scheduler, we can not call up(). */ if (!in_sched) { + int may_trylock = 1; + +#ifdef CONFIG_PREEMPT_RT_FULL + /* + * we can't take a sleeping lock with IRQs or preeption disabled + * so we can't print in these contexts + */ + if (!(preempt_count() == 0 && !irqs_disabled())) + may_trylock = 0; +#endif /* * Try to acquire and then immediately release the console * semaphore. The release will print out buffers and wake up * /dev/kmsg and syslog() users. */ - if (console_trylock()) + if (may_trylock && console_trylock()) console_unlock(); } @@ -1863,26 +1973,6 @@ static bool suppress_message_printing(in #endif /* CONFIG_PRINTK */ -#ifdef CONFIG_EARLY_PRINTK -struct console *early_console; - -asmlinkage __visible void early_printk(const char *fmt, ...) -{ - va_list ap; - char buf[512]; - int n; - - if (!early_console) - return; - - va_start(ap, fmt); - n = vscnprintf(buf, sizeof(buf), fmt, ap); - va_end(ap); - - early_console->write(early_console, buf, n); -} -#endif - static int __add_preferred_console(char *name, int idx, char *options, char *brl_options) { @@ -2229,10 +2319,15 @@ skip: console_seq++; raw_spin_unlock(&logbuf_lock); +#ifdef CONFIG_PREEMPT_RT_FULL + printk_safe_exit_irqrestore(flags); + call_console_drivers(ext_text, ext_len, text, len); +#else stop_critical_timings(); /* don't trace print latency */ call_console_drivers(ext_text, ext_len, text, len); start_critical_timings(); printk_safe_exit_irqrestore(flags); +#endif if (do_cond_resched) cond_resched(); @@ -2286,6 +2381,11 @@ void console_unblank(void) { struct console *c; + if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) { + if (in_irq() || in_nmi()) + return; + } + /* * console_unblank can no longer be called in interrupt context unless * oops_in_progress is set to 1.. Index: linux-4.14.15-rt12/kernel/ptrace.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/ptrace.c +++ linux-4.14.15-rt12/kernel/ptrace.c @@ -175,7 +175,14 @@ static bool ptrace_freeze_traced(struct spin_lock_irq(&task->sighand->siglock); if (task_is_traced(task) && !__fatal_signal_pending(task)) { - task->state = __TASK_TRACED; + unsigned long flags; + + raw_spin_lock_irqsave(&task->pi_lock, flags); + if (task->state & __TASK_TRACED) + task->state = __TASK_TRACED; + else + task->saved_state = __TASK_TRACED; + raw_spin_unlock_irqrestore(&task->pi_lock, flags); ret = true; } spin_unlock_irq(&task->sighand->siglock); Index: linux-4.14.15-rt12/kernel/rcu/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/kernel/rcu/Kconfig +++ linux-4.14.15-rt12/kernel/rcu/Kconfig @@ -36,7 +36,7 @@ config TINY_RCU config RCU_EXPERT bool "Make expert-level adjustments to RCU configuration" - default n + default y if PREEMPT_RT_FULL help This option needs to be enabled if you wish to make expert-level adjustments to RCU configuration. By default, @@ -172,7 +172,7 @@ config RCU_FANOUT_LEAF config RCU_FAST_NO_HZ bool "Accelerate last non-dyntick-idle CPU's grace periods" - depends on NO_HZ_COMMON && SMP && RCU_EXPERT + depends on NO_HZ_COMMON && SMP && RCU_EXPERT && !PREEMPT_RT_FULL default n help This option permits CPUs to enter dynticks-idle state even if @@ -191,7 +191,7 @@ config RCU_FAST_NO_HZ config RCU_BOOST bool "Enable RCU priority boosting" depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT - default n + default y if PREEMPT_RT_FULL help This option boosts the priority of preempted RCU readers that block the current preemptible RCU grace period for too long. Index: linux-4.14.15-rt12/kernel/rcu/rcu.h =================================================================== --- linux-4.14.15-rt12.orig/kernel/rcu/rcu.h +++ linux-4.14.15-rt12/kernel/rcu/rcu.h @@ -462,18 +462,26 @@ static inline void show_rcu_gp_kthreads( extern unsigned long rcutorture_testseq; extern unsigned long rcutorture_vernum; unsigned long rcu_batches_started(void); -unsigned long rcu_batches_started_bh(void); unsigned long rcu_batches_started_sched(void); unsigned long rcu_batches_completed(void); -unsigned long rcu_batches_completed_bh(void); unsigned long rcu_batches_completed_sched(void); unsigned long rcu_exp_batches_completed(void); unsigned long rcu_exp_batches_completed_sched(void); unsigned long srcu_batches_completed(struct srcu_struct *sp); void show_rcu_gp_kthreads(void); void rcu_force_quiescent_state(void); -void rcu_bh_force_quiescent_state(void); void rcu_sched_force_quiescent_state(void); + +#ifndef CONFIG_PREEMPT_RT_FULL +void rcu_bh_force_quiescent_state(void); +unsigned long rcu_batches_started_bh(void); +unsigned long rcu_batches_completed_bh(void); +#else +# define rcu_bh_force_quiescent_state rcu_force_quiescent_state +# define rcu_batches_completed_bh rcu_batches_completed +# define rcu_batches_started_bh rcu_batches_completed +#endif + #endif /* #else #ifdef CONFIG_TINY_RCU */ #ifdef CONFIG_RCU_NOCB_CPU Index: linux-4.14.15-rt12/kernel/rcu/rcu_segcblist.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/rcu/rcu_segcblist.c +++ linux-4.14.15-rt12/kernel/rcu/rcu_segcblist.c @@ -23,6 +23,7 @@ #include #include #include +#include #include "rcu_segcblist.h" Index: linux-4.14.15-rt12/kernel/rcu/rcutorture.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/rcu/rcutorture.c +++ linux-4.14.15-rt12/kernel/rcu/rcutorture.c @@ -417,6 +417,7 @@ static struct rcu_torture_ops rcu_ops = .name = "rcu" }; +#ifndef CONFIG_PREEMPT_RT_FULL /* * Definitions for rcu_bh torture testing. */ @@ -456,6 +457,12 @@ static struct rcu_torture_ops rcu_bh_ops .name = "rcu_bh" }; +#else +static struct rcu_torture_ops rcu_bh_ops = { + .ttype = INVALID_RCU_FLAVOR, +}; +#endif + /* * Don't even think about trying any of these in real life!!! * The names includes "busted", and they really means it! Index: linux-4.14.15-rt12/kernel/rcu/srcutree.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/rcu/srcutree.c +++ linux-4.14.15-rt12/kernel/rcu/srcutree.c @@ -36,6 +36,8 @@ #include #include #include +#include +#include #include "rcu.h" #include "rcu_segcblist.h" @@ -53,6 +55,33 @@ static void srcu_invoke_callbacks(struct static void srcu_reschedule(struct srcu_struct *sp, unsigned long delay); static void process_srcu(struct work_struct *work); +/* Wrappers for lock acquisition and release, see raw_spin_lock_rcu_node(). */ +#define spin_lock_rcu_node(p) \ +do { \ + spin_lock(&ACCESS_PRIVATE(p, lock)); \ + smp_mb__after_unlock_lock(); \ +} while (0) + +#define spin_unlock_rcu_node(p) spin_unlock(&ACCESS_PRIVATE(p, lock)) + +#define spin_lock_irq_rcu_node(p) \ +do { \ + spin_lock_irq(&ACCESS_PRIVATE(p, lock)); \ + smp_mb__after_unlock_lock(); \ +} while (0) + +#define spin_unlock_irq_rcu_node(p) \ + spin_unlock_irq(&ACCESS_PRIVATE(p, lock)) + +#define spin_lock_irqsave_rcu_node(p, flags) \ +do { \ + spin_lock_irqsave(&ACCESS_PRIVATE(p, lock), flags); \ + smp_mb__after_unlock_lock(); \ +} while (0) + +#define spin_unlock_irqrestore_rcu_node(p, flags) \ + spin_unlock_irqrestore(&ACCESS_PRIVATE(p, lock), flags) \ + /* * Initialize SRCU combining tree. Note that statically allocated * srcu_struct structures might already have srcu_read_lock() and @@ -77,7 +106,7 @@ static void init_srcu_struct_nodes(struc /* Each pass through this loop initializes one srcu_node structure. */ rcu_for_each_node_breadth_first(sp, snp) { - raw_spin_lock_init(&ACCESS_PRIVATE(snp, lock)); + spin_lock_init(&ACCESS_PRIVATE(snp, lock)); WARN_ON_ONCE(ARRAY_SIZE(snp->srcu_have_cbs) != ARRAY_SIZE(snp->srcu_data_have_cbs)); for (i = 0; i < ARRAY_SIZE(snp->srcu_have_cbs); i++) { @@ -111,7 +140,7 @@ static void init_srcu_struct_nodes(struc snp_first = sp->level[level]; for_each_possible_cpu(cpu) { sdp = per_cpu_ptr(sp->sda, cpu); - raw_spin_lock_init(&ACCESS_PRIVATE(sdp, lock)); + spin_lock_init(&ACCESS_PRIVATE(sdp, lock)); rcu_segcblist_init(&sdp->srcu_cblist); sdp->srcu_cblist_invoking = false; sdp->srcu_gp_seq_needed = sp->srcu_gp_seq; @@ -170,7 +199,7 @@ int __init_srcu_struct(struct srcu_struc /* Don't re-initialize a lock while it is held. */ debug_check_no_locks_freed((void *)sp, sizeof(*sp)); lockdep_init_map(&sp->dep_map, name, key, 0); - raw_spin_lock_init(&ACCESS_PRIVATE(sp, lock)); + spin_lock_init(&ACCESS_PRIVATE(sp, lock)); return init_srcu_struct_fields(sp, false); } EXPORT_SYMBOL_GPL(__init_srcu_struct); @@ -187,7 +216,7 @@ EXPORT_SYMBOL_GPL(__init_srcu_struct); */ int init_srcu_struct(struct srcu_struct *sp) { - raw_spin_lock_init(&ACCESS_PRIVATE(sp, lock)); + spin_lock_init(&ACCESS_PRIVATE(sp, lock)); return init_srcu_struct_fields(sp, false); } EXPORT_SYMBOL_GPL(init_srcu_struct); @@ -210,13 +239,13 @@ static void check_init_srcu_struct(struc /* The smp_load_acquire() pairs with the smp_store_release(). */ if (!rcu_seq_state(smp_load_acquire(&sp->srcu_gp_seq_needed))) /*^^^*/ return; /* Already initialized. */ - raw_spin_lock_irqsave_rcu_node(sp, flags); + spin_lock_irqsave_rcu_node(sp, flags); if (!rcu_seq_state(sp->srcu_gp_seq_needed)) { - raw_spin_unlock_irqrestore_rcu_node(sp, flags); + spin_unlock_irqrestore_rcu_node(sp, flags); return; } init_srcu_struct_fields(sp, true); - raw_spin_unlock_irqrestore_rcu_node(sp, flags); + spin_unlock_irqrestore_rcu_node(sp, flags); } /* @@ -425,21 +454,6 @@ static void srcu_gp_start(struct srcu_st } /* - * Track online CPUs to guide callback workqueue placement. - */ -DEFINE_PER_CPU(bool, srcu_online); - -void srcu_online_cpu(unsigned int cpu) -{ - WRITE_ONCE(per_cpu(srcu_online, cpu), true); -} - -void srcu_offline_cpu(unsigned int cpu) -{ - WRITE_ONCE(per_cpu(srcu_online, cpu), false); -} - -/* * Place the workqueue handler on the specified CPU if online, otherwise * just run it whereever. This is useful for placing workqueue handlers * that are to invoke the specified CPU's callbacks. @@ -450,12 +464,12 @@ static bool srcu_queue_delayed_work_on(i { bool ret; - preempt_disable(); - if (READ_ONCE(per_cpu(srcu_online, cpu))) + cpus_read_lock(); + if (cpu_online(cpu)) ret = queue_delayed_work_on(cpu, wq, dwork, delay); else ret = queue_delayed_work(wq, dwork, delay); - preempt_enable(); + cpus_read_unlock(); return ret; } @@ -513,7 +527,7 @@ static void srcu_gp_end(struct srcu_stru mutex_lock(&sp->srcu_cb_mutex); /* End the current grace period. */ - raw_spin_lock_irq_rcu_node(sp); + spin_lock_irq_rcu_node(sp); idx = rcu_seq_state(sp->srcu_gp_seq); WARN_ON_ONCE(idx != SRCU_STATE_SCAN2); cbdelay = srcu_get_delay(sp); @@ -522,7 +536,7 @@ static void srcu_gp_end(struct srcu_stru gpseq = rcu_seq_current(&sp->srcu_gp_seq); if (ULONG_CMP_LT(sp->srcu_gp_seq_needed_exp, gpseq)) sp->srcu_gp_seq_needed_exp = gpseq; - raw_spin_unlock_irq_rcu_node(sp); + spin_unlock_irq_rcu_node(sp); mutex_unlock(&sp->srcu_gp_mutex); /* A new grace period can start at this point. But only one. */ @@ -530,7 +544,7 @@ static void srcu_gp_end(struct srcu_stru idx = rcu_seq_ctr(gpseq) % ARRAY_SIZE(snp->srcu_have_cbs); idxnext = (idx + 1) % ARRAY_SIZE(snp->srcu_have_cbs); rcu_for_each_node_breadth_first(sp, snp) { - raw_spin_lock_irq_rcu_node(snp); + spin_lock_irq_rcu_node(snp); cbs = false; if (snp >= sp->level[rcu_num_lvls - 1]) cbs = snp->srcu_have_cbs[idx] == gpseq; @@ -540,7 +554,7 @@ static void srcu_gp_end(struct srcu_stru snp->srcu_gp_seq_needed_exp = gpseq; mask = snp->srcu_data_have_cbs[idx]; snp->srcu_data_have_cbs[idx] = 0; - raw_spin_unlock_irq_rcu_node(snp); + spin_unlock_irq_rcu_node(snp); if (cbs) srcu_schedule_cbs_snp(sp, snp, mask, cbdelay); @@ -548,11 +562,11 @@ static void srcu_gp_end(struct srcu_stru if (!(gpseq & counter_wrap_check)) for (cpu = snp->grplo; cpu <= snp->grphi; cpu++) { sdp = per_cpu_ptr(sp->sda, cpu); - raw_spin_lock_irqsave_rcu_node(sdp, flags); + spin_lock_irqsave_rcu_node(sdp, flags); if (ULONG_CMP_GE(gpseq, sdp->srcu_gp_seq_needed + 100)) sdp->srcu_gp_seq_needed = gpseq; - raw_spin_unlock_irqrestore_rcu_node(sdp, flags); + spin_unlock_irqrestore_rcu_node(sdp, flags); } } @@ -560,17 +574,17 @@ static void srcu_gp_end(struct srcu_stru mutex_unlock(&sp->srcu_cb_mutex); /* Start a new grace period if needed. */ - raw_spin_lock_irq_rcu_node(sp); + spin_lock_irq_rcu_node(sp); gpseq = rcu_seq_current(&sp->srcu_gp_seq); if (!rcu_seq_state(gpseq) && ULONG_CMP_LT(gpseq, sp->srcu_gp_seq_needed)) { srcu_gp_start(sp); - raw_spin_unlock_irq_rcu_node(sp); + spin_unlock_irq_rcu_node(sp); /* Throttle expedited grace periods: Should be rare! */ srcu_reschedule(sp, rcu_seq_ctr(gpseq) & 0x3ff ? 0 : SRCU_INTERVAL); } else { - raw_spin_unlock_irq_rcu_node(sp); + spin_unlock_irq_rcu_node(sp); } } @@ -590,18 +604,18 @@ static void srcu_funnel_exp_start(struct if (rcu_seq_done(&sp->srcu_gp_seq, s) || ULONG_CMP_GE(READ_ONCE(snp->srcu_gp_seq_needed_exp), s)) return; - raw_spin_lock_irqsave_rcu_node(snp, flags); + spin_lock_irqsave_rcu_node(snp, flags); if (ULONG_CMP_GE(snp->srcu_gp_seq_needed_exp, s)) { - raw_spin_unlock_irqrestore_rcu_node(snp, flags); + spin_unlock_irqrestore_rcu_node(snp, flags); return; } WRITE_ONCE(snp->srcu_gp_seq_needed_exp, s); - raw_spin_unlock_irqrestore_rcu_node(snp, flags); + spin_unlock_irqrestore_rcu_node(snp, flags); } - raw_spin_lock_irqsave_rcu_node(sp, flags); + spin_lock_irqsave_rcu_node(sp, flags); if (!ULONG_CMP_LT(sp->srcu_gp_seq_needed_exp, s)) sp->srcu_gp_seq_needed_exp = s; - raw_spin_unlock_irqrestore_rcu_node(sp, flags); + spin_unlock_irqrestore_rcu_node(sp, flags); } /* @@ -623,12 +637,12 @@ static void srcu_funnel_gp_start(struct for (; snp != NULL; snp = snp->srcu_parent) { if (rcu_seq_done(&sp->srcu_gp_seq, s) && snp != sdp->mynode) return; /* GP already done and CBs recorded. */ - raw_spin_lock_irqsave_rcu_node(snp, flags); + spin_lock_irqsave_rcu_node(snp, flags); if (ULONG_CMP_GE(snp->srcu_have_cbs[idx], s)) { snp_seq = snp->srcu_have_cbs[idx]; if (snp == sdp->mynode && snp_seq == s) snp->srcu_data_have_cbs[idx] |= sdp->grpmask; - raw_spin_unlock_irqrestore_rcu_node(snp, flags); + spin_unlock_irqrestore_rcu_node(snp, flags); if (snp == sdp->mynode && snp_seq != s) { srcu_schedule_cbs_sdp(sdp, do_norm ? SRCU_INTERVAL @@ -644,11 +658,11 @@ static void srcu_funnel_gp_start(struct snp->srcu_data_have_cbs[idx] |= sdp->grpmask; if (!do_norm && ULONG_CMP_LT(snp->srcu_gp_seq_needed_exp, s)) snp->srcu_gp_seq_needed_exp = s; - raw_spin_unlock_irqrestore_rcu_node(snp, flags); + spin_unlock_irqrestore_rcu_node(snp, flags); } /* Top of tree, must ensure the grace period will be started. */ - raw_spin_lock_irqsave_rcu_node(sp, flags); + spin_lock_irqsave_rcu_node(sp, flags); if (ULONG_CMP_LT(sp->srcu_gp_seq_needed, s)) { /* * Record need for grace period s. Pair with load @@ -667,7 +681,7 @@ static void srcu_funnel_gp_start(struct queue_delayed_work(system_power_efficient_wq, &sp->work, srcu_get_delay(sp)); } - raw_spin_unlock_irqrestore_rcu_node(sp, flags); + spin_unlock_irqrestore_rcu_node(sp, flags); } /* @@ -736,6 +750,8 @@ static void srcu_flip(struct srcu_struct * negligible when amoritized over that time period, and the extra latency * of a needlessly non-expedited grace period is similarly negligible. */ +static DEFINE_LOCAL_IRQ_LOCK(sp_llock); + static bool srcu_might_be_idle(struct srcu_struct *sp) { unsigned long curseq; @@ -744,13 +760,13 @@ static bool srcu_might_be_idle(struct sr unsigned long t; /* If the local srcu_data structure has callbacks, not idle. */ - local_irq_save(flags); + local_lock_irqsave(sp_llock, flags); sdp = this_cpu_ptr(sp->sda); if (rcu_segcblist_pend_cbs(&sdp->srcu_cblist)) { - local_irq_restore(flags); + local_unlock_irqrestore(sp_llock, flags); return false; /* Callbacks already present, so not idle. */ } - local_irq_restore(flags); + local_unlock_irqrestore(sp_llock, flags); /* * No local callbacks, so probabalistically probe global state. @@ -828,9 +844,9 @@ void __call_srcu(struct srcu_struct *sp, return; } rhp->func = func; - local_irq_save(flags); + local_lock_irqsave(sp_llock, flags); sdp = this_cpu_ptr(sp->sda); - raw_spin_lock_rcu_node(sdp); + spin_lock_rcu_node(sdp); rcu_segcblist_enqueue(&sdp->srcu_cblist, rhp, false); rcu_segcblist_advance(&sdp->srcu_cblist, rcu_seq_current(&sp->srcu_gp_seq)); @@ -844,7 +860,8 @@ void __call_srcu(struct srcu_struct *sp, sdp->srcu_gp_seq_needed_exp = s; needexp = true; } - raw_spin_unlock_irqrestore_rcu_node(sdp, flags); + spin_unlock_rcu_node(sdp); + local_unlock_irqrestore(sp_llock, flags); if (needgp) srcu_funnel_gp_start(sp, sdp, s, do_norm); else if (needexp) @@ -900,7 +917,7 @@ static void __synchronize_srcu(struct sr /* * Make sure that later code is ordered after the SRCU grace - * period. This pairs with the raw_spin_lock_irq_rcu_node() + * period. This pairs with the spin_lock_irq_rcu_node() * in srcu_invoke_callbacks(). Unlike Tree RCU, this is needed * because the current CPU might have been totally uninvolved with * (and thus unordered against) that grace period. @@ -1024,7 +1041,7 @@ void srcu_barrier(struct srcu_struct *sp */ for_each_possible_cpu(cpu) { sdp = per_cpu_ptr(sp->sda, cpu); - raw_spin_lock_irq_rcu_node(sdp); + spin_lock_irq_rcu_node(sdp); atomic_inc(&sp->srcu_barrier_cpu_cnt); sdp->srcu_barrier_head.func = srcu_barrier_cb; debug_rcu_head_queue(&sdp->srcu_barrier_head); @@ -1033,7 +1050,7 @@ void srcu_barrier(struct srcu_struct *sp debug_rcu_head_unqueue(&sdp->srcu_barrier_head); atomic_dec(&sp->srcu_barrier_cpu_cnt); } - raw_spin_unlock_irq_rcu_node(sdp); + spin_unlock_irq_rcu_node(sdp); } /* Remove the initial count, at which point reaching zero can happen. */ @@ -1082,17 +1099,17 @@ static void srcu_advance_state(struct sr */ idx = rcu_seq_state(smp_load_acquire(&sp->srcu_gp_seq)); /* ^^^ */ if (idx == SRCU_STATE_IDLE) { - raw_spin_lock_irq_rcu_node(sp); + spin_lock_irq_rcu_node(sp); if (ULONG_CMP_GE(sp->srcu_gp_seq, sp->srcu_gp_seq_needed)) { WARN_ON_ONCE(rcu_seq_state(sp->srcu_gp_seq)); - raw_spin_unlock_irq_rcu_node(sp); + spin_unlock_irq_rcu_node(sp); mutex_unlock(&sp->srcu_gp_mutex); return; } idx = rcu_seq_state(READ_ONCE(sp->srcu_gp_seq)); if (idx == SRCU_STATE_IDLE) srcu_gp_start(sp); - raw_spin_unlock_irq_rcu_node(sp); + spin_unlock_irq_rcu_node(sp); if (idx != SRCU_STATE_IDLE) { mutex_unlock(&sp->srcu_gp_mutex); return; /* Someone else started the grace period. */ @@ -1141,19 +1158,19 @@ static void srcu_invoke_callbacks(struct sdp = container_of(work, struct srcu_data, work.work); sp = sdp->sp; rcu_cblist_init(&ready_cbs); - raw_spin_lock_irq_rcu_node(sdp); + spin_lock_irq_rcu_node(sdp); rcu_segcblist_advance(&sdp->srcu_cblist, rcu_seq_current(&sp->srcu_gp_seq)); if (sdp->srcu_cblist_invoking || !rcu_segcblist_ready_cbs(&sdp->srcu_cblist)) { - raw_spin_unlock_irq_rcu_node(sdp); + spin_unlock_irq_rcu_node(sdp); return; /* Someone else on the job or nothing to do. */ } /* We are on the job! Extract and invoke ready callbacks. */ sdp->srcu_cblist_invoking = true; rcu_segcblist_extract_done_cbs(&sdp->srcu_cblist, &ready_cbs); - raw_spin_unlock_irq_rcu_node(sdp); + spin_unlock_irq_rcu_node(sdp); rhp = rcu_cblist_dequeue(&ready_cbs); for (; rhp != NULL; rhp = rcu_cblist_dequeue(&ready_cbs)) { debug_rcu_head_unqueue(rhp); @@ -1166,13 +1183,13 @@ static void srcu_invoke_callbacks(struct * Update counts, accelerate new callbacks, and if needed, * schedule another round of callback invocation. */ - raw_spin_lock_irq_rcu_node(sdp); + spin_lock_irq_rcu_node(sdp); rcu_segcblist_insert_count(&sdp->srcu_cblist, &ready_cbs); (void)rcu_segcblist_accelerate(&sdp->srcu_cblist, rcu_seq_snap(&sp->srcu_gp_seq)); sdp->srcu_cblist_invoking = false; more = rcu_segcblist_ready_cbs(&sdp->srcu_cblist); - raw_spin_unlock_irq_rcu_node(sdp); + spin_unlock_irq_rcu_node(sdp); if (more) srcu_schedule_cbs_sdp(sdp, 0); } @@ -1185,7 +1202,7 @@ static void srcu_reschedule(struct srcu_ { bool pushgp = true; - raw_spin_lock_irq_rcu_node(sp); + spin_lock_irq_rcu_node(sp); if (ULONG_CMP_GE(sp->srcu_gp_seq, sp->srcu_gp_seq_needed)) { if (!WARN_ON_ONCE(rcu_seq_state(sp->srcu_gp_seq))) { /* All requests fulfilled, time to go idle. */ @@ -1195,7 +1212,7 @@ static void srcu_reschedule(struct srcu_ /* Outstanding request and no GP. Start one. */ srcu_gp_start(sp); } - raw_spin_unlock_irq_rcu_node(sp); + spin_unlock_irq_rcu_node(sp); if (pushgp) queue_delayed_work(system_power_efficient_wq, &sp->work, delay); Index: linux-4.14.15-rt12/kernel/rcu/tree.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/rcu/tree.c +++ linux-4.14.15-rt12/kernel/rcu/tree.c @@ -58,6 +58,11 @@ #include #include #include +#include +#include +#include +#include +#include "../time/tick-internal.h" #include "tree.h" #include "rcu.h" @@ -243,6 +248,19 @@ void rcu_sched_qs(void) this_cpu_ptr(&rcu_sched_data), true); } +#ifdef CONFIG_PREEMPT_RT_FULL +static void rcu_preempt_qs(void); + +void rcu_bh_qs(void) +{ + unsigned long flags; + + /* Callers to this function, rcu_preempt_qs(), must disable irqs. */ + local_irq_save(flags); + rcu_preempt_qs(); + local_irq_restore(flags); +} +#else void rcu_bh_qs(void) { RCU_LOCKDEP_WARN(preemptible(), "rcu_bh_qs() invoked with preemption enabled!!!"); @@ -253,6 +271,7 @@ void rcu_bh_qs(void) __this_cpu_write(rcu_bh_data.cpu_no_qs.b.norm, false); } } +#endif /* * Steal a bit from the bottom of ->dynticks for idle entry/exit @@ -564,11 +583,13 @@ EXPORT_SYMBOL_GPL(rcu_batches_started_sc /* * Return the number of RCU BH batches started thus far for debug & stats. */ +#ifndef CONFIG_PREEMPT_RT_FULL unsigned long rcu_batches_started_bh(void) { return rcu_bh_state.gpnum; } EXPORT_SYMBOL_GPL(rcu_batches_started_bh); +#endif /* * Return the number of RCU batches completed thus far for debug & stats. @@ -588,6 +609,7 @@ unsigned long rcu_batches_completed_sche } EXPORT_SYMBOL_GPL(rcu_batches_completed_sched); +#ifndef CONFIG_PREEMPT_RT_FULL /* * Return the number of RCU BH batches completed thus far for debug & stats. */ @@ -596,6 +618,7 @@ unsigned long rcu_batches_completed_bh(v return rcu_bh_state.completed; } EXPORT_SYMBOL_GPL(rcu_batches_completed_bh); +#endif /* * Return the number of RCU expedited batches completed thus far for @@ -619,6 +642,7 @@ unsigned long rcu_exp_batches_completed_ } EXPORT_SYMBOL_GPL(rcu_exp_batches_completed_sched); +#ifndef CONFIG_PREEMPT_RT_FULL /* * Force a quiescent state. */ @@ -637,6 +661,13 @@ void rcu_bh_force_quiescent_state(void) } EXPORT_SYMBOL_GPL(rcu_bh_force_quiescent_state); +#else +void rcu_force_quiescent_state(void) +{ +} +EXPORT_SYMBOL_GPL(rcu_force_quiescent_state); +#endif + /* * Force a quiescent state for RCU-sched. */ @@ -687,9 +718,11 @@ void rcutorture_get_gp_data(enum rcutort case RCU_FLAVOR: rsp = rcu_state_p; break; +#ifndef CONFIG_PREEMPT_RT_FULL case RCU_BH_FLAVOR: rsp = &rcu_bh_state; break; +#endif case RCU_SCHED_FLAVOR: rsp = &rcu_sched_state; break; @@ -2918,18 +2951,17 @@ __rcu_process_callbacks(struct rcu_state /* * Do RCU core processing for the current CPU. */ -static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused) +static __latent_entropy void rcu_process_callbacks(void) { struct rcu_state *rsp; if (cpu_is_offline(smp_processor_id())) return; - trace_rcu_utilization(TPS("Start RCU core")); for_each_rcu_flavor(rsp) __rcu_process_callbacks(rsp); - trace_rcu_utilization(TPS("End RCU core")); } +static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task); /* * Schedule RCU callback invocation. If the specified type of RCU * does not support RCU priority boosting, just do a direct call, @@ -2941,18 +2973,105 @@ static void invoke_rcu_callbacks(struct { if (unlikely(!READ_ONCE(rcu_scheduler_fully_active))) return; - if (likely(!rsp->boost)) { - rcu_do_batch(rsp, rdp); + rcu_do_batch(rsp, rdp); +} + +static void rcu_wake_cond(struct task_struct *t, int status) +{ + /* + * If the thread is yielding, only wake it when this + * is invoked from idle + */ + if (t && (status != RCU_KTHREAD_YIELDING || is_idle_task(current))) + wake_up_process(t); +} + +/* + * Wake up this CPU's rcuc kthread to do RCU core processing. + */ +static void invoke_rcu_core(void) +{ + unsigned long flags; + struct task_struct *t; + + if (!cpu_online(smp_processor_id())) return; + local_irq_save(flags); + __this_cpu_write(rcu_cpu_has_work, 1); + t = __this_cpu_read(rcu_cpu_kthread_task); + if (t != NULL && current != t) + rcu_wake_cond(t, __this_cpu_read(rcu_cpu_kthread_status)); + local_irq_restore(flags); +} + +static void rcu_cpu_kthread_park(unsigned int cpu) +{ + per_cpu(rcu_cpu_kthread_status, cpu) = RCU_KTHREAD_OFFCPU; +} + +static int rcu_cpu_kthread_should_run(unsigned int cpu) +{ + return __this_cpu_read(rcu_cpu_has_work); +} + +/* + * Per-CPU kernel thread that invokes RCU callbacks. This replaces the + * RCU softirq used in flavors and configurations of RCU that do not + * support RCU priority boosting. + */ +static void rcu_cpu_kthread(unsigned int cpu) +{ + unsigned int *statusp = this_cpu_ptr(&rcu_cpu_kthread_status); + char work, *workp = this_cpu_ptr(&rcu_cpu_has_work); + int spincnt; + + for (spincnt = 0; spincnt < 10; spincnt++) { + trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait")); + local_bh_disable(); + *statusp = RCU_KTHREAD_RUNNING; + this_cpu_inc(rcu_cpu_kthread_loops); + local_irq_disable(); + work = *workp; + *workp = 0; + local_irq_enable(); + if (work) + rcu_process_callbacks(); + local_bh_enable(); + if (*workp == 0) { + trace_rcu_utilization(TPS("End CPU kthread@rcu_wait")); + *statusp = RCU_KTHREAD_WAITING; + return; + } } - invoke_rcu_callbacks_kthread(); + *statusp = RCU_KTHREAD_YIELDING; + trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield")); + schedule_timeout_interruptible(2); + trace_rcu_utilization(TPS("End CPU kthread@rcu_yield")); + *statusp = RCU_KTHREAD_WAITING; } -static void invoke_rcu_core(void) +static struct smp_hotplug_thread rcu_cpu_thread_spec = { + .store = &rcu_cpu_kthread_task, + .thread_should_run = rcu_cpu_kthread_should_run, + .thread_fn = rcu_cpu_kthread, + .thread_comm = "rcuc/%u", + .setup = rcu_cpu_kthread_setup, + .park = rcu_cpu_kthread_park, +}; + +/* + * Spawn per-CPU RCU core processing kthreads. + */ +static int __init rcu_spawn_core_kthreads(void) { - if (cpu_online(smp_processor_id())) - raise_softirq(RCU_SOFTIRQ); + int cpu; + + for_each_possible_cpu(cpu) + per_cpu(rcu_cpu_has_work, cpu) = 0; + BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec)); + return 0; } +early_initcall(rcu_spawn_core_kthreads); /* * Handle any core-RCU processing required by a call_rcu() invocation. @@ -3113,6 +3232,7 @@ void call_rcu_sched(struct rcu_head *hea } EXPORT_SYMBOL_GPL(call_rcu_sched); +#ifndef CONFIG_PREEMPT_RT_FULL /** * call_rcu_bh() - Queue an RCU for invocation after a quicker grace period. * @head: structure to be used for queueing the RCU updates. @@ -3140,6 +3260,7 @@ void call_rcu_bh(struct rcu_head *head, __call_rcu(head, func, &rcu_bh_state, -1, 0); } EXPORT_SYMBOL_GPL(call_rcu_bh); +#endif /* * Queue an RCU callback for lazy invocation after a grace period. @@ -3225,6 +3346,7 @@ void synchronize_sched(void) } EXPORT_SYMBOL_GPL(synchronize_sched); +#ifndef CONFIG_PREEMPT_RT_FULL /** * synchronize_rcu_bh - wait until an rcu_bh grace period has elapsed. * @@ -3251,6 +3373,7 @@ void synchronize_rcu_bh(void) wait_rcu_gp(call_rcu_bh); } EXPORT_SYMBOL_GPL(synchronize_rcu_bh); +#endif /** * get_state_synchronize_rcu - Snapshot current RCU state @@ -3601,6 +3724,7 @@ static void _rcu_barrier(struct rcu_stat mutex_unlock(&rsp->barrier_mutex); } +#ifndef CONFIG_PREEMPT_RT_FULL /** * rcu_barrier_bh - Wait until all in-flight call_rcu_bh() callbacks complete. */ @@ -3609,6 +3733,7 @@ void rcu_barrier_bh(void) _rcu_barrier(&rcu_bh_state); } EXPORT_SYMBOL_GPL(rcu_barrier_bh); +#endif /** * rcu_barrier_sched - Wait for in-flight call_rcu_sched() callbacks. @@ -3741,8 +3866,6 @@ int rcutree_online_cpu(unsigned int cpu) { sync_sched_exp_online_cleanup(cpu); rcutree_affinity_setting(cpu, -1); - if (IS_ENABLED(CONFIG_TREE_SRCU)) - srcu_online_cpu(cpu); return 0; } @@ -3753,8 +3876,6 @@ int rcutree_online_cpu(unsigned int cpu) int rcutree_offline_cpu(unsigned int cpu) { rcutree_affinity_setting(cpu, cpu); - if (IS_ENABLED(CONFIG_TREE_SRCU)) - srcu_offline_cpu(cpu); return 0; } @@ -4184,12 +4305,13 @@ void __init rcu_init(void) rcu_bootup_announce(); rcu_init_geometry(); +#ifndef CONFIG_PREEMPT_RT_FULL rcu_init_one(&rcu_bh_state); +#endif rcu_init_one(&rcu_sched_state); if (dump_tree) rcu_dump_rcu_node_tree(&rcu_sched_state); __rcu_init_preempt(); - open_softirq(RCU_SOFTIRQ, rcu_process_callbacks); /* * We don't need protection against CPU-hotplug here because @@ -4200,8 +4322,6 @@ void __init rcu_init(void) for_each_online_cpu(cpu) { rcutree_prepare_cpu(cpu); rcu_cpu_starting(cpu); - if (IS_ENABLED(CONFIG_TREE_SRCU)) - srcu_online_cpu(cpu); } } Index: linux-4.14.15-rt12/kernel/rcu/tree.h =================================================================== --- linux-4.14.15-rt12.orig/kernel/rcu/tree.h +++ linux-4.14.15-rt12/kernel/rcu/tree.h @@ -427,7 +427,9 @@ extern struct list_head rcu_struct_flavo */ extern struct rcu_state rcu_sched_state; +#ifndef CONFIG_PREEMPT_RT_FULL extern struct rcu_state rcu_bh_state; +#endif #ifdef CONFIG_PREEMPT_RCU extern struct rcu_state rcu_preempt_state; @@ -436,12 +438,10 @@ extern struct rcu_state rcu_preempt_stat int rcu_dynticks_snap(struct rcu_dynticks *rdtp); bool rcu_eqs_special_set(int cpu); -#ifdef CONFIG_RCU_BOOST DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status); DECLARE_PER_CPU(int, rcu_cpu_kthread_cpu); DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_loops); DECLARE_PER_CPU(char, rcu_cpu_has_work); -#endif /* #ifdef CONFIG_RCU_BOOST */ #ifndef RCU_TREE_NONCORE @@ -461,10 +461,9 @@ void call_rcu(struct rcu_head *head, rcu static void __init __rcu_init_preempt(void); static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags); static void rcu_preempt_boost_start_gp(struct rcu_node *rnp); -static void invoke_rcu_callbacks_kthread(void); static bool rcu_is_callbacks_kthread(void); +static void rcu_cpu_kthread_setup(unsigned int cpu); #ifdef CONFIG_RCU_BOOST -static void rcu_preempt_do_callbacks(void); static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp, struct rcu_node *rnp); #endif /* #ifdef CONFIG_RCU_BOOST */ Index: linux-4.14.15-rt12/kernel/rcu/tree_plugin.h =================================================================== --- linux-4.14.15-rt12.orig/kernel/rcu/tree_plugin.h +++ linux-4.14.15-rt12/kernel/rcu/tree_plugin.h @@ -24,39 +24,16 @@ * Paul E. McKenney */ -#include -#include -#include -#include -#include -#include -#include "../time/tick-internal.h" - -#ifdef CONFIG_RCU_BOOST - #include "../locking/rtmutex_common.h" /* * Control variables for per-CPU and per-rcu_node kthreads. These * handle all flavors of RCU. */ -static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task); DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_status); DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_loops); DEFINE_PER_CPU(char, rcu_cpu_has_work); -#else /* #ifdef CONFIG_RCU_BOOST */ - -/* - * Some architectures do not define rt_mutexes, but if !CONFIG_RCU_BOOST, - * all uses are in dead code. Provide a definition to keep the compiler - * happy, but add WARN_ON_ONCE() to complain if used in the wrong place. - * This probably needs to be excluded from -rt builds. - */ -#define rt_mutex_owner(a) ({ WARN_ON_ONCE(1); NULL; }) - -#endif /* #else #ifdef CONFIG_RCU_BOOST */ - #ifdef CONFIG_RCU_NOCB_CPU static cpumask_var_t rcu_nocb_mask; /* CPUs to have callbacks offloaded. */ static bool have_rcu_nocb_mask; /* Was rcu_nocb_mask allocated? */ @@ -324,9 +301,13 @@ static void rcu_preempt_note_context_swi struct task_struct *t = current; struct rcu_data *rdp; struct rcu_node *rnp; + int mg_counter = 0; RCU_LOCKDEP_WARN(!irqs_disabled(), "rcu_preempt_note_context_switch() invoked with interrupts enabled!!!\n"); - WARN_ON_ONCE(!preempt && t->rcu_read_lock_nesting > 0); +#if defined(CONFIG_PREEMPT_RT_BASE) + mg_counter = t->migrate_disable; +#endif + WARN_ON_ONCE(!preempt && t->rcu_read_lock_nesting > 0 && !mg_counter); if (t->rcu_read_lock_nesting > 0 && !t->rcu_read_unlock_special.b.blocked) { @@ -463,7 +444,7 @@ void rcu_read_unlock_special(struct task } /* Hardware IRQ handlers cannot block, complain if they get here. */ - if (in_irq() || in_serving_softirq()) { + if (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_OFFSET)) { lockdep_rcu_suspicious(__FILE__, __LINE__, "rcu_read_unlock() from irq or softirq with blocking in critical section!!!\n"); pr_alert("->rcu_read_unlock_special: %#x (b: %d, enq: %d nq: %d)\n", @@ -530,7 +511,7 @@ void rcu_read_unlock_special(struct task /* Unboost if we were boosted. */ if (IS_ENABLED(CONFIG_RCU_BOOST) && drop_boost_mutex) - rt_mutex_unlock(&rnp->boost_mtx); + rt_mutex_futex_unlock(&rnp->boost_mtx); /* * If this was the last task on the expedited lists, @@ -678,15 +659,6 @@ static void rcu_preempt_check_callbacks( t->rcu_read_unlock_special.b.need_qs = true; } -#ifdef CONFIG_RCU_BOOST - -static void rcu_preempt_do_callbacks(void) -{ - rcu_do_batch(rcu_state_p, this_cpu_ptr(rcu_data_p)); -} - -#endif /* #ifdef CONFIG_RCU_BOOST */ - /** * call_rcu() - Queue an RCU callback for invocation after a grace period. * @head: structure to be used for queueing the RCU updates. @@ -909,20 +881,23 @@ void exit_rcu(void) #endif /* #else #ifdef CONFIG_PREEMPT_RCU */ +/* + * If boosting, set rcuc kthreads to realtime priority. + */ +static void rcu_cpu_kthread_setup(unsigned int cpu) +{ +#ifdef CONFIG_RCU_BOOST + struct sched_param sp; + + sp.sched_priority = kthread_prio; + sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); +#endif /* #ifdef CONFIG_RCU_BOOST */ +} + #ifdef CONFIG_RCU_BOOST #include "../locking/rtmutex_common.h" -static void rcu_wake_cond(struct task_struct *t, int status) -{ - /* - * If the thread is yielding, only wake it when this - * is invoked from idle - */ - if (status != RCU_KTHREAD_YIELDING || is_idle_task(current)) - wake_up_process(t); -} - /* * Carry out RCU priority boosting on the task indicated by ->exp_tasks * or ->boost_tasks, advancing the pointer to the next task in the @@ -1065,23 +1040,6 @@ static void rcu_initiate_boost(struct rc } /* - * Wake up the per-CPU kthread to invoke RCU callbacks. - */ -static void invoke_rcu_callbacks_kthread(void) -{ - unsigned long flags; - - local_irq_save(flags); - __this_cpu_write(rcu_cpu_has_work, 1); - if (__this_cpu_read(rcu_cpu_kthread_task) != NULL && - current != __this_cpu_read(rcu_cpu_kthread_task)) { - rcu_wake_cond(__this_cpu_read(rcu_cpu_kthread_task), - __this_cpu_read(rcu_cpu_kthread_status)); - } - local_irq_restore(flags); -} - -/* * Is the current CPU running the RCU-callbacks kthread? * Caller must have preemption disabled. */ @@ -1135,67 +1093,6 @@ static int rcu_spawn_one_boost_kthread(s return 0; } -static void rcu_kthread_do_work(void) -{ - rcu_do_batch(&rcu_sched_state, this_cpu_ptr(&rcu_sched_data)); - rcu_do_batch(&rcu_bh_state, this_cpu_ptr(&rcu_bh_data)); - rcu_preempt_do_callbacks(); -} - -static void rcu_cpu_kthread_setup(unsigned int cpu) -{ - struct sched_param sp; - - sp.sched_priority = kthread_prio; - sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); -} - -static void rcu_cpu_kthread_park(unsigned int cpu) -{ - per_cpu(rcu_cpu_kthread_status, cpu) = RCU_KTHREAD_OFFCPU; -} - -static int rcu_cpu_kthread_should_run(unsigned int cpu) -{ - return __this_cpu_read(rcu_cpu_has_work); -} - -/* - * Per-CPU kernel thread that invokes RCU callbacks. This replaces the - * RCU softirq used in flavors and configurations of RCU that do not - * support RCU priority boosting. - */ -static void rcu_cpu_kthread(unsigned int cpu) -{ - unsigned int *statusp = this_cpu_ptr(&rcu_cpu_kthread_status); - char work, *workp = this_cpu_ptr(&rcu_cpu_has_work); - int spincnt; - - for (spincnt = 0; spincnt < 10; spincnt++) { - trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait")); - local_bh_disable(); - *statusp = RCU_KTHREAD_RUNNING; - this_cpu_inc(rcu_cpu_kthread_loops); - local_irq_disable(); - work = *workp; - *workp = 0; - local_irq_enable(); - if (work) - rcu_kthread_do_work(); - local_bh_enable(); - if (*workp == 0) { - trace_rcu_utilization(TPS("End CPU kthread@rcu_wait")); - *statusp = RCU_KTHREAD_WAITING; - return; - } - } - *statusp = RCU_KTHREAD_YIELDING; - trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield")); - schedule_timeout_interruptible(2); - trace_rcu_utilization(TPS("End CPU kthread@rcu_yield")); - *statusp = RCU_KTHREAD_WAITING; -} - /* * Set the per-rcu_node kthread's affinity to cover all CPUs that are * served by the rcu_node in question. The CPU hotplug lock is still @@ -1226,26 +1123,12 @@ static void rcu_boost_kthread_setaffinit free_cpumask_var(cm); } -static struct smp_hotplug_thread rcu_cpu_thread_spec = { - .store = &rcu_cpu_kthread_task, - .thread_should_run = rcu_cpu_kthread_should_run, - .thread_fn = rcu_cpu_kthread, - .thread_comm = "rcuc/%u", - .setup = rcu_cpu_kthread_setup, - .park = rcu_cpu_kthread_park, -}; - /* * Spawn boost kthreads -- called as soon as the scheduler is running. */ static void __init rcu_spawn_boost_kthreads(void) { struct rcu_node *rnp; - int cpu; - - for_each_possible_cpu(cpu) - per_cpu(rcu_cpu_has_work, cpu) = 0; - BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec)); rcu_for_each_leaf_node(rcu_state_p, rnp) (void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp); } @@ -1268,11 +1151,6 @@ static void rcu_initiate_boost(struct rc raw_spin_unlock_irqrestore_rcu_node(rnp, flags); } -static void invoke_rcu_callbacks_kthread(void) -{ - WARN_ON_ONCE(1); -} - static bool rcu_is_callbacks_kthread(void) { return false; @@ -1296,7 +1174,7 @@ static void rcu_prepare_kthreads(int cpu #endif /* #else #ifdef CONFIG_RCU_BOOST */ -#if !defined(CONFIG_RCU_FAST_NO_HZ) +#if !defined(CONFIG_RCU_FAST_NO_HZ) || defined(CONFIG_PREEMPT_RT_FULL) /* * Check to see if any future RCU-related work will need to be done @@ -1312,7 +1190,9 @@ int rcu_needs_cpu(u64 basemono, u64 *nex *nextevt = KTIME_MAX; return rcu_cpu_has_callbacks(NULL); } +#endif /* !defined(CONFIG_RCU_FAST_NO_HZ) || defined(CONFIG_PREEMPT_RT_FULL) */ +#if !defined(CONFIG_RCU_FAST_NO_HZ) /* * Because we do not have RCU_FAST_NO_HZ, don't bother cleaning up * after it. @@ -1408,6 +1288,8 @@ static bool __maybe_unused rcu_try_advan return cbs_ready; } +#ifndef CONFIG_PREEMPT_RT_FULL + /* * Allow the CPU to enter dyntick-idle mode unless it has callbacks ready * to invoke. If the CPU has callbacks, try to advance them. Tell the @@ -1450,6 +1332,7 @@ int rcu_needs_cpu(u64 basemono, u64 *nex *nextevt = basemono + dj * TICK_NSEC; return 0; } +#endif /* #ifndef CONFIG_PREEMPT_RT_FULL */ /* * Prepare a CPU for idle from an RCU perspective. The first major task Index: linux-4.14.15-rt12/kernel/rcu/update.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/rcu/update.c +++ linux-4.14.15-rt12/kernel/rcu/update.c @@ -66,7 +66,7 @@ extern int rcu_expedited; /* from sysctl module_param(rcu_expedited, int, 0); extern int rcu_normal; /* from sysctl */ module_param(rcu_normal, int, 0); -static int rcu_normal_after_boot; +static int rcu_normal_after_boot = IS_ENABLED(CONFIG_PREEMPT_RT_FULL); module_param(rcu_normal_after_boot, int, 0); #endif /* #ifndef CONFIG_TINY_RCU */ @@ -333,6 +333,7 @@ int rcu_read_lock_held(void) } EXPORT_SYMBOL_GPL(rcu_read_lock_held); +#ifndef CONFIG_PREEMPT_RT_FULL /** * rcu_read_lock_bh_held() - might we be in RCU-bh read-side critical section? * @@ -359,6 +360,7 @@ int rcu_read_lock_bh_held(void) return in_softirq() || irqs_disabled(); } EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held); +#endif #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ Index: linux-4.14.15-rt12/kernel/sched/Makefile =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/Makefile +++ linux-4.14.15-rt12/kernel/sched/Makefile @@ -18,7 +18,7 @@ endif obj-y += core.o loadavg.o clock.o cputime.o obj-y += idle_task.o fair.o rt.o deadline.o -obj-y += wait.o wait_bit.o swait.o completion.o idle.o +obj-y += wait.o wait_bit.o swait.o swork.o completion.o idle.o obj-$(CONFIG_SMP) += cpupri.o cpudeadline.o topology.o stop_task.o obj-$(CONFIG_SCHED_AUTOGROUP) += autogroup.o obj-$(CONFIG_SCHEDSTATS) += stats.o Index: linux-4.14.15-rt12/kernel/sched/completion.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/completion.c +++ linux-4.14.15-rt12/kernel/sched/completion.c @@ -32,7 +32,7 @@ void complete(struct completion *x) { unsigned long flags; - spin_lock_irqsave(&x->wait.lock, flags); + raw_spin_lock_irqsave(&x->wait.lock, flags); /* * Perform commit of crossrelease here. @@ -41,8 +41,8 @@ void complete(struct completion *x) if (x->done != UINT_MAX) x->done++; - __wake_up_locked(&x->wait, TASK_NORMAL, 1); - spin_unlock_irqrestore(&x->wait.lock, flags); + swake_up_locked(&x->wait); + raw_spin_unlock_irqrestore(&x->wait.lock, flags); } EXPORT_SYMBOL(complete); @@ -66,10 +66,10 @@ void complete_all(struct completion *x) { unsigned long flags; - spin_lock_irqsave(&x->wait.lock, flags); + raw_spin_lock_irqsave(&x->wait.lock, flags); x->done = UINT_MAX; - __wake_up_locked(&x->wait, TASK_NORMAL, 0); - spin_unlock_irqrestore(&x->wait.lock, flags); + swake_up_all_locked(&x->wait); + raw_spin_unlock_irqrestore(&x->wait.lock, flags); } EXPORT_SYMBOL(complete_all); @@ -78,20 +78,20 @@ do_wait_for_common(struct completion *x, long (*action)(long), long timeout, int state) { if (!x->done) { - DECLARE_WAITQUEUE(wait, current); + DECLARE_SWAITQUEUE(wait); - __add_wait_queue_entry_tail_exclusive(&x->wait, &wait); + __prepare_to_swait(&x->wait, &wait); do { if (signal_pending_state(state, current)) { timeout = -ERESTARTSYS; break; } __set_current_state(state); - spin_unlock_irq(&x->wait.lock); + raw_spin_unlock_irq(&x->wait.lock); timeout = action(timeout); - spin_lock_irq(&x->wait.lock); + raw_spin_lock_irq(&x->wait.lock); } while (!x->done && timeout); - __remove_wait_queue(&x->wait, &wait); + __finish_swait(&x->wait, &wait); if (!x->done) return timeout; } @@ -108,9 +108,9 @@ __wait_for_common(struct completion *x, complete_acquire(x); - spin_lock_irq(&x->wait.lock); + raw_spin_lock_irq(&x->wait.lock); timeout = do_wait_for_common(x, action, timeout, state); - spin_unlock_irq(&x->wait.lock); + raw_spin_unlock_irq(&x->wait.lock); complete_release(x); @@ -299,12 +299,12 @@ bool try_wait_for_completion(struct comp if (!READ_ONCE(x->done)) return 0; - spin_lock_irqsave(&x->wait.lock, flags); + raw_spin_lock_irqsave(&x->wait.lock, flags); if (!x->done) ret = 0; else if (x->done != UINT_MAX) x->done--; - spin_unlock_irqrestore(&x->wait.lock, flags); + raw_spin_unlock_irqrestore(&x->wait.lock, flags); return ret; } EXPORT_SYMBOL(try_wait_for_completion); @@ -330,8 +330,8 @@ bool completion_done(struct completion * * otherwise we can end up freeing the completion before complete() * is done referencing it. */ - spin_lock_irqsave(&x->wait.lock, flags); - spin_unlock_irqrestore(&x->wait.lock, flags); + raw_spin_lock_irqsave(&x->wait.lock, flags); + raw_spin_unlock_irqrestore(&x->wait.lock, flags); return true; } EXPORT_SYMBOL(completion_done); Index: linux-4.14.15-rt12/kernel/sched/core.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/core.c +++ linux-4.14.15-rt12/kernel/sched/core.c @@ -59,7 +59,11 @@ const_debug unsigned int sysctl_sched_fe * Number of tasks to iterate in a single balance run. * Limited because this is done with IRQs disabled. */ +#ifndef CONFIG_PREEMPT_RT_FULL const_debug unsigned int sysctl_sched_nr_migrate = 32; +#else +const_debug unsigned int sysctl_sched_nr_migrate = 8; +#endif /* * period over which we average the RT time consumption, measured @@ -341,7 +345,7 @@ static void init_rq_hrtick(struct rq *rq rq->hrtick_csd.info = rq; #endif - hrtimer_init(&rq->hrtick_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hrtimer_init(&rq->hrtick_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD); rq->hrtick_timer.function = hrtick; } #else /* CONFIG_SCHED_HRTICK */ @@ -423,9 +427,15 @@ static bool set_nr_if_polling(struct tas #endif #endif -void wake_q_add(struct wake_q_head *head, struct task_struct *task) +void __wake_q_add(struct wake_q_head *head, struct task_struct *task, + bool sleeper) { - struct wake_q_node *node = &task->wake_q; + struct wake_q_node *node; + + if (sleeper) + node = &task->wake_q_sleeper; + else + node = &task->wake_q; /* * Atomically grab the task, if ->wake_q is !nil already it means @@ -447,24 +457,32 @@ void wake_q_add(struct wake_q_head *head head->lastp = &node->next; } -void wake_up_q(struct wake_q_head *head) +void __wake_up_q(struct wake_q_head *head, bool sleeper) { struct wake_q_node *node = head->first; while (node != WAKE_Q_TAIL) { struct task_struct *task; - task = container_of(node, struct task_struct, wake_q); + if (sleeper) + task = container_of(node, struct task_struct, wake_q_sleeper); + else + task = container_of(node, struct task_struct, wake_q); BUG_ON(!task); /* Task can safely be re-inserted now: */ node = node->next; - task->wake_q.next = NULL; - + if (sleeper) + task->wake_q_sleeper.next = NULL; + else + task->wake_q.next = NULL; /* * wake_up_process() implies a wmb() to pair with the queueing * in wake_q_add() so as not to miss wakeups. */ - wake_up_process(task); + if (sleeper) + wake_up_lock_sleeper(task); + else + wake_up_process(task); put_task_struct(task); } } @@ -500,6 +518,48 @@ void resched_curr(struct rq *rq) trace_sched_wake_idle_without_ipi(cpu); } +#ifdef CONFIG_PREEMPT_LAZY + +static int tsk_is_polling(struct task_struct *p) +{ +#ifdef TIF_POLLING_NRFLAG + return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG); +#else + return 0; +#endif +} + +void resched_curr_lazy(struct rq *rq) +{ + struct task_struct *curr = rq->curr; + int cpu; + + if (!sched_feat(PREEMPT_LAZY)) { + resched_curr(rq); + return; + } + + lockdep_assert_held(&rq->lock); + + if (test_tsk_need_resched(curr)) + return; + + if (test_tsk_need_resched_lazy(curr)) + return; + + set_tsk_need_resched_lazy(curr); + + cpu = cpu_of(rq); + if (cpu == smp_processor_id()) + return; + + /* NEED_RESCHED_LAZY must be visible before we test polling */ + smp_mb(); + if (!tsk_is_polling(curr)) + smp_send_reschedule(cpu); +} +#endif + void resched_cpu(int cpu) { struct rq *rq = cpu_rq(cpu); @@ -523,11 +583,14 @@ void resched_cpu(int cpu) */ int get_nohz_timer_target(void) { - int i, cpu = smp_processor_id(); + int i, cpu; struct sched_domain *sd; + preempt_disable_rt(); + cpu = smp_processor_id(); + if (!idle_cpu(cpu) && is_housekeeping_cpu(cpu)) - return cpu; + goto preempt_en_rt; rcu_read_lock(); for_each_domain(cpu, sd) { @@ -546,6 +609,8 @@ int get_nohz_timer_target(void) cpu = housekeeping_any_cpu(); unlock: rcu_read_unlock(); +preempt_en_rt: + preempt_enable_rt(); return cpu; } @@ -960,7 +1025,7 @@ static struct rq *__migrate_task(struct } /* Affinity changed (again). */ - if (!cpumask_test_cpu(dest_cpu, &p->cpus_allowed)) + if (!cpumask_test_cpu(dest_cpu, p->cpus_ptr)) return rq; update_rq_clock(rq); @@ -988,7 +1053,7 @@ static int migration_cpu_stop(void *data local_irq_disable(); /* * We need to explicitly wake pending tasks before running - * __migrate_task() such that we will not miss enforcing cpus_allowed + * __migrate_task() such that we will not miss enforcing cpus_ptr * during wakeups, see set_cpus_allowed_ptr()'s TASK_WAKING test. */ sched_ttwu_pending(); @@ -1019,11 +1084,19 @@ static int migration_cpu_stop(void *data */ void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask) { - cpumask_copy(&p->cpus_allowed, new_mask); + cpumask_copy(&p->cpus_mask, new_mask); p->nr_cpus_allowed = cpumask_weight(new_mask); } -void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) +#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP) +int __migrate_disabled(struct task_struct *p) +{ + return p->migrate_disable; +} +#endif + +static void __do_set_cpus_allowed_tail(struct task_struct *p, + const struct cpumask *new_mask) { struct rq *rq = task_rq(p); bool queued, running; @@ -1052,6 +1125,20 @@ void do_set_cpus_allowed(struct task_str set_curr_task(rq, p); } +void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) +{ +#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP) + if (__migrate_disabled(p)) { + lockdep_assert_held(&p->pi_lock); + + cpumask_copy(&p->cpus_mask, new_mask); + p->migrate_disable_update = 1; + return; + } +#endif + __do_set_cpus_allowed_tail(p, new_mask); +} + /* * Change a given task's CPU affinity. Migrate the thread to a * proper CPU and schedule it away if the CPU it's executing on @@ -1089,7 +1176,7 @@ static int __set_cpus_allowed_ptr(struct goto out; } - if (cpumask_equal(&p->cpus_allowed, new_mask)) + if (cpumask_equal(p->cpus_ptr, new_mask)) goto out; if (!cpumask_intersects(new_mask, cpu_valid_mask)) { @@ -1110,8 +1197,15 @@ static int __set_cpus_allowed_ptr(struct } /* Can the task run on the task's current CPU? If so, we're done */ - if (cpumask_test_cpu(task_cpu(p), new_mask)) + if (cpumask_test_cpu(task_cpu(p), new_mask) || __migrate_disabled(p)) + goto out; + +#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP) + if (__migrate_disabled(p)) { + p->migrate_disable_update = 1; goto out; + } +#endif dest_cpu = cpumask_any_and(cpu_valid_mask, new_mask); if (task_running(rq, p) || p->state == TASK_WAKING) { @@ -1250,10 +1344,10 @@ static int migrate_swap_stop(void *data) if (task_cpu(arg->src_task) != arg->src_cpu) goto unlock; - if (!cpumask_test_cpu(arg->dst_cpu, &arg->src_task->cpus_allowed)) + if (!cpumask_test_cpu(arg->dst_cpu, arg->src_task->cpus_ptr)) goto unlock; - if (!cpumask_test_cpu(arg->src_cpu, &arg->dst_task->cpus_allowed)) + if (!cpumask_test_cpu(arg->src_cpu, arg->dst_task->cpus_ptr)) goto unlock; __migrate_swap_task(arg->src_task, arg->dst_cpu); @@ -1294,10 +1388,10 @@ int migrate_swap(struct task_struct *cur if (!cpu_active(arg.src_cpu) || !cpu_active(arg.dst_cpu)) goto out; - if (!cpumask_test_cpu(arg.dst_cpu, &arg.src_task->cpus_allowed)) + if (!cpumask_test_cpu(arg.dst_cpu, arg.src_task->cpus_ptr)) goto out; - if (!cpumask_test_cpu(arg.src_cpu, &arg.dst_task->cpus_allowed)) + if (!cpumask_test_cpu(arg.src_cpu, arg.dst_task->cpus_ptr)) goto out; trace_sched_swap_numa(cur, arg.src_cpu, p, arg.dst_cpu); @@ -1307,6 +1401,18 @@ out: return ret; } +static bool check_task_state(struct task_struct *p, long match_state) +{ + bool match = false; + + raw_spin_lock_irq(&p->pi_lock); + if (p->state == match_state || p->saved_state == match_state) + match = true; + raw_spin_unlock_irq(&p->pi_lock); + + return match; +} + /* * wait_task_inactive - wait for a thread to unschedule. * @@ -1351,7 +1457,7 @@ unsigned long wait_task_inactive(struct * is actually now running somewhere else! */ while (task_running(rq, p)) { - if (match_state && unlikely(p->state != match_state)) + if (match_state && !check_task_state(p, match_state)) return 0; cpu_relax(); } @@ -1366,7 +1472,8 @@ unsigned long wait_task_inactive(struct running = task_running(rq, p); queued = task_on_rq_queued(p); ncsw = 0; - if (!match_state || p->state == match_state) + if (!match_state || p->state == match_state || + p->saved_state == match_state) ncsw = p->nvcsw | LONG_MIN; /* sets MSB */ task_rq_unlock(rq, p, &rf); @@ -1441,7 +1548,7 @@ void kick_process(struct task_struct *p) EXPORT_SYMBOL_GPL(kick_process); /* - * ->cpus_allowed is protected by both rq->lock and p->pi_lock + * ->cpus_ptr is protected by both rq->lock and p->pi_lock * * A few notes on cpu_active vs cpu_online: * @@ -1481,14 +1588,14 @@ static int select_fallback_rq(int cpu, s for_each_cpu(dest_cpu, nodemask) { if (!cpu_active(dest_cpu)) continue; - if (cpumask_test_cpu(dest_cpu, &p->cpus_allowed)) + if (cpumask_test_cpu(dest_cpu, p->cpus_ptr)) return dest_cpu; } } for (;;) { /* Any allowed, online CPU? */ - for_each_cpu(dest_cpu, &p->cpus_allowed) { + for_each_cpu(dest_cpu, p->cpus_ptr) { if (!(p->flags & PF_KTHREAD) && !cpu_active(dest_cpu)) continue; if (!cpu_online(dest_cpu)) @@ -1533,7 +1640,7 @@ out: } /* - * The caller (fork, wakeup) owns p->pi_lock, ->cpus_allowed is stable. + * The caller (fork, wakeup) owns p->pi_lock, ->cpus_ptr is stable. */ static inline int select_task_rq(struct task_struct *p, int cpu, int sd_flags, int wake_flags) @@ -1543,11 +1650,11 @@ int select_task_rq(struct task_struct *p if (p->nr_cpus_allowed > 1) cpu = p->sched_class->select_task_rq(p, cpu, sd_flags, wake_flags); else - cpu = cpumask_any(&p->cpus_allowed); + cpu = cpumask_any(p->cpus_ptr); /* * In order not to call set_task_cpu() on a blocking task we need - * to rely on ttwu() to place the task on a valid ->cpus_allowed + * to rely on ttwu() to place the task on a valid ->cpus_ptr * CPU. * * Since this is common to all placement strategies, this lives here. @@ -1555,7 +1662,7 @@ int select_task_rq(struct task_struct *p * [ this allows ->select_task() to simply return task_cpu(p) and * not worry about this generic constraint ] */ - if (unlikely(!cpumask_test_cpu(cpu, &p->cpus_allowed) || + if (unlikely(!cpumask_test_cpu(cpu, p->cpus_ptr) || !cpu_online(cpu))) cpu = select_fallback_rq(task_cpu(p), p); @@ -1651,10 +1758,6 @@ static inline void ttwu_activate(struct { activate_task(rq, p, en_flags); p->on_rq = TASK_ON_RQ_QUEUED; - - /* If a worker is waking up, notify the workqueue: */ - if (p->flags & PF_WQ_WORKER) - wq_worker_waking_up(p, cpu_of(rq)); } /* @@ -1978,8 +2081,27 @@ try_to_wake_up(struct task_struct *p, un */ raw_spin_lock_irqsave(&p->pi_lock, flags); smp_mb__after_spinlock(); - if (!(p->state & state)) + if (!(p->state & state)) { + /* + * The task might be running due to a spinlock sleeper + * wakeup. Check the saved state and set it to running + * if the wakeup condition is true. + */ + if (!(wake_flags & WF_LOCK_SLEEPER)) { + if (p->saved_state & state) { + p->saved_state = TASK_RUNNING; + success = 1; + } + } goto out; + } + + /* + * If this is a regular wakeup, then we can unconditionally + * clear the saved state of a "lock sleeper". + */ + if (!(wake_flags & WF_LOCK_SLEEPER)) + p->saved_state = TASK_RUNNING; trace_sched_waking(p); @@ -2076,56 +2198,6 @@ out: } /** - * try_to_wake_up_local - try to wake up a local task with rq lock held - * @p: the thread to be awakened - * @rf: request-queue flags for pinning - * - * Put @p on the run-queue if it's not already there. The caller must - * ensure that this_rq() is locked, @p is bound to this_rq() and not - * the current task. - */ -static void try_to_wake_up_local(struct task_struct *p, struct rq_flags *rf) -{ - struct rq *rq = task_rq(p); - - if (WARN_ON_ONCE(rq != this_rq()) || - WARN_ON_ONCE(p == current)) - return; - - lockdep_assert_held(&rq->lock); - - if (!raw_spin_trylock(&p->pi_lock)) { - /* - * This is OK, because current is on_cpu, which avoids it being - * picked for load-balance and preemption/IRQs are still - * disabled avoiding further scheduler activity on it and we've - * not yet picked a replacement task. - */ - rq_unlock(rq, rf); - raw_spin_lock(&p->pi_lock); - rq_relock(rq, rf); - } - - if (!(p->state & TASK_NORMAL)) - goto out; - - trace_sched_waking(p); - - if (!task_on_rq_queued(p)) { - if (p->in_iowait) { - delayacct_blkio_end(p); - atomic_dec(&rq->nr_iowait); - } - ttwu_activate(rq, p, ENQUEUE_WAKEUP | ENQUEUE_NOCLOCK); - } - - ttwu_do_wakeup(rq, p, 0, rf); - ttwu_stat(p, smp_processor_id(), 0); -out: - raw_spin_unlock(&p->pi_lock); -} - -/** * wake_up_process - Wake up a specific process * @p: The process to be woken up. * @@ -2143,6 +2215,18 @@ int wake_up_process(struct task_struct * } EXPORT_SYMBOL(wake_up_process); +/** + * wake_up_lock_sleeper - Wake up a specific process blocked on a "sleeping lock" + * @p: The process to be woken up. + * + * Same as wake_up_process() above, but wake_flags=WF_LOCK_SLEEPER to indicate + * the nature of the wakeup. + */ +int wake_up_lock_sleeper(struct task_struct *p) +{ + return try_to_wake_up(p, TASK_UNINTERRUPTIBLE, WF_LOCK_SLEEPER); +} + int wake_up_state(struct task_struct *p, unsigned int state) { return try_to_wake_up(p, state, 0); @@ -2403,6 +2487,9 @@ int sched_fork(unsigned long clone_flags p->on_cpu = 0; #endif init_task_preempt_count(p); +#ifdef CONFIG_HAVE_PREEMPT_LAZY + task_thread_info(p)->preempt_lazy_count = 0; +#endif #ifdef CONFIG_SMP plist_node_init(&p->pushable_tasks, MAX_PRIO); RB_CLEAR_NODE(&p->pushable_dl_tasks); @@ -2445,7 +2532,7 @@ void wake_up_new_task(struct task_struct #ifdef CONFIG_SMP /* * Fork balancing, do it here and not earlier because: - * - cpus_allowed can change in the fork path + * - cpus_ptr can change in the fork path * - any previously selected CPU might disappear through hotplug * * Use __set_task_cpu() to avoid calling sched_class::migrate_task_rq, @@ -2658,21 +2745,16 @@ static struct rq *finish_task_switch(str finish_arch_post_lock_switch(); fire_sched_in_preempt_notifiers(current); + /* + * We use mmdrop_delayed() here so we don't have to do the + * full __mmdrop() when we are the last user. + */ if (mm) - mmdrop(mm); + mmdrop_delayed(mm); if (unlikely(prev_state == TASK_DEAD)) { if (prev->sched_class->task_dead) prev->sched_class->task_dead(prev); - /* - * Remove function-return probe instances associated with this - * task and put them back on the free list. - */ - kprobe_flush_task(prev); - - /* Task is done with its stack. */ - put_task_stack(prev); - put_task_struct(prev); } @@ -3319,25 +3401,13 @@ static void __sched notrace __schedule(b atomic_inc(&rq->nr_iowait); delayacct_blkio_start(); } - - /* - * If a worker went to sleep, notify and ask workqueue - * whether it wants to wake up a task to maintain - * concurrency. - */ - if (prev->flags & PF_WQ_WORKER) { - struct task_struct *to_wakeup; - - to_wakeup = wq_worker_sleeping(prev); - if (to_wakeup) - try_to_wake_up_local(to_wakeup, &rf); - } } switch_count = &prev->nvcsw; } next = pick_next_task(rq, prev, &rf); clear_tsk_need_resched(prev); + clear_tsk_need_resched_lazy(prev); clear_preempt_need_resched(); if (likely(prev != next)) { @@ -3405,8 +3475,19 @@ void __noreturn do_task_dead(void) static inline void sched_submit_work(struct task_struct *tsk) { - if (!tsk->state || tsk_is_pi_blocked(tsk)) + if (!tsk->state) + return; + /* + * If a worker went to sleep, notify and ask workqueue whether + * it wants to wake up a task to maintain concurrency. + */ + if (tsk->flags & PF_WQ_WORKER) + wq_worker_sleeping(tsk); + + + if (tsk_is_pi_blocked(tsk)) return; + /* * If we are going to sleep and we have plugged IO queued, * make sure to submit it to avoid deadlocks. @@ -3415,6 +3496,12 @@ static inline void sched_submit_work(str blk_schedule_flush_plug(tsk); } +static void sched_update_worker(struct task_struct *tsk) +{ + if (tsk->flags & PF_WQ_WORKER) + wq_worker_running(tsk); +} + asmlinkage __visible void __sched schedule(void) { struct task_struct *tsk = current; @@ -3425,6 +3512,7 @@ asmlinkage __visible void __sched schedu __schedule(false); sched_preempt_enable_no_resched(); } while (need_resched()); + sched_update_worker(tsk); } EXPORT_SYMBOL(schedule); @@ -3513,6 +3601,30 @@ static void __sched notrace preempt_sche } while (need_resched()); } +#ifdef CONFIG_PREEMPT_LAZY +/* + * If TIF_NEED_RESCHED is then we allow to be scheduled away since this is + * set by a RT task. Oterwise we try to avoid beeing scheduled out as long as + * preempt_lazy_count counter >0. + */ +static __always_inline int preemptible_lazy(void) +{ + if (test_thread_flag(TIF_NEED_RESCHED)) + return 1; + if (current_thread_info()->preempt_lazy_count) + return 0; + return 1; +} + +#else + +static inline int preemptible_lazy(void) +{ + return 1; +} + +#endif + #ifdef CONFIG_PREEMPT /* * this is the entry point to schedule() from in-kernel preemption @@ -3527,7 +3639,8 @@ asmlinkage __visible void __sched notrac */ if (likely(!preemptible())) return; - + if (!preemptible_lazy()) + return; preempt_schedule_common(); } NOKPROBE_SYMBOL(preempt_schedule); @@ -3554,6 +3667,9 @@ asmlinkage __visible void __sched notrac if (likely(!preemptible())) return; + if (!preemptible_lazy()) + return; + do { /* * Because the function tracer can trace preempt_count_sub() @@ -3576,7 +3692,16 @@ asmlinkage __visible void __sched notrac * an infinite recursion. */ prev_ctx = exception_enter(); + /* + * The add/subtract must not be traced by the function + * tracer. But we still want to account for the + * preempt off latency tracer. Since the _notrace versions + * of add/subtract skip the accounting for latency tracer + * we must force it manually. + */ + start_critical_timings(); __schedule(true); + stop_critical_timings(); exception_exit(prev_ctx); preempt_latency_stop(1); @@ -4162,7 +4287,7 @@ change: * the entire root_domain to become SCHED_DEADLINE. We * will also fail if there's no bandwidth available. */ - if (!cpumask_subset(span, &p->cpus_allowed) || + if (!cpumask_subset(span, p->cpus_ptr) || rq->rd->dl_bw.bw == 0) { task_rq_unlock(rq, p, &rf); return -EPERM; @@ -4756,7 +4881,7 @@ long sched_getaffinity(pid_t pid, struct goto out_unlock; raw_spin_lock_irqsave(&p->pi_lock, flags); - cpumask_and(mask, &p->cpus_allowed, cpu_active_mask); + cpumask_and(mask, &p->cpus_mask, cpu_active_mask); raw_spin_unlock_irqrestore(&p->pi_lock, flags); out_unlock: @@ -4875,6 +5000,7 @@ int __cond_resched_lock(spinlock_t *lock } EXPORT_SYMBOL(__cond_resched_lock); +#ifndef CONFIG_PREEMPT_RT_FULL int __sched __cond_resched_softirq(void) { BUG_ON(!in_softirq()); @@ -4888,6 +5014,7 @@ int __sched __cond_resched_softirq(void) return 0; } EXPORT_SYMBOL(__cond_resched_softirq); +#endif /** * yield - yield the current processor to other threads. @@ -5282,7 +5409,9 @@ void init_idle(struct task_struct *idle, /* Set the preempt count _outside_ the spinlocks! */ init_idle_preempt_count(idle, cpu); - +#ifdef CONFIG_HAVE_PREEMPT_LAZY + task_thread_info(idle)->preempt_lazy_count = 0; +#endif /* * The idle tasks have their own, simple scheduling class: */ @@ -5321,7 +5450,7 @@ int task_can_attach(struct task_struct * * allowed nodes is unnecessary. Thus, cpusets are not * applicable for such threads. This prevents checking for * success of set_cpus_allowed_ptr() on all attached tasks - * before cpus_allowed may be changed. + * before cpus_mask may be changed. */ if (p->flags & PF_NO_SETAFFINITY) { ret = -EINVAL; @@ -5348,7 +5477,7 @@ int migrate_task_to(struct task_struct * if (curr_cpu == target_cpu) return 0; - if (!cpumask_test_cpu(target_cpu, &p->cpus_allowed)) + if (!cpumask_test_cpu(target_cpu, p->cpus_ptr)) return -EINVAL; /* TODO: This is not properly updating schedstats */ @@ -5387,6 +5516,8 @@ void sched_setnuma(struct task_struct *p #endif /* CONFIG_NUMA_BALANCING */ #ifdef CONFIG_HOTPLUG_CPU +static DEFINE_PER_CPU(struct mm_struct *, idle_last_mm); + /* * Ensure that the idle task is using init_mm right before its CPU goes * offline. @@ -5401,7 +5532,12 @@ void idle_task_exit(void) switch_mm(mm, &init_mm, current); finish_arch_post_lock_switch(); } - mmdrop(mm); + /* + * Defer the cleanup to an alive cpu. On RT we can neither + * call mmdrop() nor mmdrop_delayed() from here. + */ + per_cpu(idle_last_mm, smp_processor_id()) = mm; + } /* @@ -5485,7 +5621,7 @@ static void migrate_tasks(struct rq *dea put_prev_task(rq, next); /* - * Rules for changing task_struct::cpus_allowed are holding + * Rules for changing task_struct::cpus_mask are holding * both pi_lock and rq->lock, such that holding either * stabilizes the mask. * @@ -5704,6 +5840,10 @@ int sched_cpu_dying(unsigned int cpu) update_max_interval(); nohz_balance_exit_idle(cpu); hrtick_clear(rq); + if (per_cpu(idle_last_mm, cpu)) { + mmdrop_delayed(per_cpu(idle_last_mm, cpu)); + per_cpu(idle_last_mm, cpu) = NULL; + } return 0; } #endif @@ -5968,7 +6108,7 @@ void __init sched_init(void) #ifdef CONFIG_DEBUG_ATOMIC_SLEEP static inline int preempt_count_equals(int preempt_offset) { - int nested = preempt_count() + rcu_preempt_depth(); + int nested = preempt_count() + sched_rcu_preempt_depth(); return (nested == preempt_offset); } @@ -6760,3 +6900,197 @@ const u32 sched_prio_to_wmult[40] = { /* 10 */ 39045157, 49367440, 61356676, 76695844, 95443717, /* 15 */ 119304647, 148102320, 186737708, 238609294, 286331153, }; + +#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP) + +static inline void +update_nr_migratory(struct task_struct *p, long delta) +{ + if (unlikely((p->sched_class == &rt_sched_class || + p->sched_class == &dl_sched_class) && + p->nr_cpus_allowed > 1)) { + if (p->sched_class == &rt_sched_class) + task_rq(p)->rt.rt_nr_migratory += delta; + else + task_rq(p)->dl.dl_nr_migratory += delta; + } +} + +static inline void +migrate_disable_update_cpus_allowed(struct task_struct *p) +{ + struct rq *rq; + struct rq_flags rf; + + p->cpus_ptr = cpumask_of(smp_processor_id()); + + rq = task_rq_lock(p, &rf); + update_nr_migratory(p, -1); + p->nr_cpus_allowed = 1; + task_rq_unlock(rq, p, &rf); +} + +static inline void +migrate_enable_update_cpus_allowed(struct task_struct *p) +{ + struct rq *rq; + struct rq_flags rf; + + p->cpus_ptr = &p->cpus_mask; + + rq = task_rq_lock(p, &rf); + p->nr_cpus_allowed = cpumask_weight(&p->cpus_mask); + update_nr_migratory(p, 1); + task_rq_unlock(rq, p, &rf); +} + +void migrate_disable(void) +{ + struct task_struct *p = current; + + if (in_atomic() || irqs_disabled()) { +#ifdef CONFIG_SCHED_DEBUG + p->migrate_disable_atomic++; +#endif + return; + } +#ifdef CONFIG_SCHED_DEBUG + if (unlikely(p->migrate_disable_atomic)) { + tracing_off(); + WARN_ON_ONCE(1); + } +#endif + + if (p->migrate_disable) { + p->migrate_disable++; + return; + } + + preempt_disable(); + preempt_lazy_disable(); + pin_current_cpu(); + + migrate_disable_update_cpus_allowed(p); + p->migrate_disable = 1; + + preempt_enable(); +} +EXPORT_SYMBOL(migrate_disable); + +void migrate_enable(void) +{ + struct task_struct *p = current; + + if (in_atomic() || irqs_disabled()) { +#ifdef CONFIG_SCHED_DEBUG + p->migrate_disable_atomic--; +#endif + return; + } + +#ifdef CONFIG_SCHED_DEBUG + if (unlikely(p->migrate_disable_atomic)) { + tracing_off(); + WARN_ON_ONCE(1); + } +#endif + + WARN_ON_ONCE(p->migrate_disable <= 0); + if (p->migrate_disable > 1) { + p->migrate_disable--; + return; + } + + preempt_disable(); + + p->migrate_disable = 0; + migrate_enable_update_cpus_allowed(p); + + if (p->migrate_disable_update) { + struct rq *rq; + struct rq_flags rf; + + rq = task_rq_lock(p, &rf); + update_rq_clock(rq); + + __do_set_cpus_allowed_tail(p, &p->cpus_mask); + task_rq_unlock(rq, p, &rf); + + p->migrate_disable_update = 0; + + WARN_ON(smp_processor_id() != task_cpu(p)); + if (!cpumask_test_cpu(task_cpu(p), &p->cpus_mask)) { + const struct cpumask *cpu_valid_mask = cpu_active_mask; + struct migration_arg arg; + unsigned int dest_cpu; + + if (p->flags & PF_KTHREAD) { + /* + * Kernel threads are allowed on online && !active CPUs + */ + cpu_valid_mask = cpu_online_mask; + } + dest_cpu = cpumask_any_and(cpu_valid_mask, &p->cpus_mask); + arg.task = p; + arg.dest_cpu = dest_cpu; + + unpin_current_cpu(); + preempt_lazy_enable(); + preempt_enable(); + stop_one_cpu(task_cpu(p), migration_cpu_stop, &arg); + tlb_migrate_finish(p->mm); + + return; + } + } + unpin_current_cpu(); + preempt_lazy_enable(); + preempt_enable(); +} +EXPORT_SYMBOL(migrate_enable); + +#elif !defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE) +void migrate_disable(void) +{ + struct task_struct *p = current; + + if (in_atomic() || irqs_disabled()) { +#ifdef CONFIG_SCHED_DEBUG + p->migrate_disable_atomic++; +#endif + return; + } +#ifdef CONFIG_SCHED_DEBUG + if (unlikely(p->migrate_disable_atomic)) { + tracing_off(); + WARN_ON_ONCE(1); + } +#endif + + p->migrate_disable++; +} +EXPORT_SYMBOL(migrate_disable); + +void migrate_enable(void) +{ + struct task_struct *p = current; + + if (in_atomic() || irqs_disabled()) { +#ifdef CONFIG_SCHED_DEBUG + p->migrate_disable_atomic--; +#endif + return; + } + +#ifdef CONFIG_SCHED_DEBUG + if (unlikely(p->migrate_disable_atomic)) { + tracing_off(); + WARN_ON_ONCE(1); + } +#endif + + WARN_ON_ONCE(p->migrate_disable <= 0); + p->migrate_disable--; +} +EXPORT_SYMBOL(migrate_enable); +#endif Index: linux-4.14.15-rt12/kernel/sched/cpudeadline.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/cpudeadline.c +++ linux-4.14.15-rt12/kernel/sched/cpudeadline.c @@ -127,13 +127,13 @@ int cpudl_find(struct cpudl *cp, struct const struct sched_dl_entity *dl_se = &p->dl; if (later_mask && - cpumask_and(later_mask, cp->free_cpus, &p->cpus_allowed)) { + cpumask_and(later_mask, cp->free_cpus, p->cpus_ptr)) { return 1; } else { int best_cpu = cpudl_maximum(cp); WARN_ON(best_cpu != -1 && !cpu_present(best_cpu)); - if (cpumask_test_cpu(best_cpu, &p->cpus_allowed) && + if (cpumask_test_cpu(best_cpu, p->cpus_ptr) && dl_time_before(dl_se->deadline, cp->elements[0].dl)) { if (later_mask) cpumask_set_cpu(best_cpu, later_mask); Index: linux-4.14.15-rt12/kernel/sched/cpupri.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/cpupri.c +++ linux-4.14.15-rt12/kernel/sched/cpupri.c @@ -103,11 +103,11 @@ int cpupri_find(struct cpupri *cp, struc if (skip) continue; - if (cpumask_any_and(&p->cpus_allowed, vec->mask) >= nr_cpu_ids) + if (cpumask_any_and(p->cpus_ptr, vec->mask) >= nr_cpu_ids) continue; if (lowest_mask) { - cpumask_and(lowest_mask, &p->cpus_allowed, vec->mask); + cpumask_and(lowest_mask, p->cpus_ptr, vec->mask); /* * We have to ensure that we have at least one bit Index: linux-4.14.15-rt12/kernel/sched/deadline.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/deadline.c +++ linux-4.14.15-rt12/kernel/sched/deadline.c @@ -504,7 +504,7 @@ static struct rq *dl_task_offline_migrat * If we cannot preempt any rq, fall back to pick any * online cpu. */ - cpu = cpumask_any_and(cpu_active_mask, &p->cpus_allowed); + cpu = cpumask_any_and(cpu_active_mask, p->cpus_ptr); if (cpu >= nr_cpu_ids) { /* * Fail to find any suitable cpu. @@ -1020,7 +1020,7 @@ void init_dl_task_timer(struct sched_dl_ { struct hrtimer *timer = &dl_se->dl_timer; - hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD); timer->function = dl_task_timer; } @@ -1749,7 +1749,7 @@ static void set_curr_task_dl(struct rq * static int pick_dl_task(struct rq *rq, struct task_struct *p, int cpu) { if (!task_running(rq, p) && - cpumask_test_cpu(cpu, &p->cpus_allowed)) + cpumask_test_cpu(cpu, p->cpus_ptr)) return 1; return 0; } @@ -1899,7 +1899,7 @@ static struct rq *find_lock_later_rq(str /* Retry if something changed. */ if (double_lock_balance(rq, later_rq)) { if (unlikely(task_rq(task) != rq || - !cpumask_test_cpu(later_rq->cpu, &task->cpus_allowed) || + !cpumask_test_cpu(later_rq->cpu, task->cpus_ptr) || task_running(rq, task) || !dl_task(task) || !task_on_rq_queued(task))) { Index: linux-4.14.15-rt12/kernel/sched/debug.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/debug.c +++ linux-4.14.15-rt12/kernel/sched/debug.c @@ -1017,6 +1017,10 @@ void proc_sched_show_task(struct task_st P(dl.runtime); P(dl.deadline); } +#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP) + P(migrate_disable); +#endif + P(nr_cpus_allowed); #undef PN_SCHEDSTAT #undef PN #undef __PN Index: linux-4.14.15-rt12/kernel/sched/fair.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/fair.c +++ linux-4.14.15-rt12/kernel/sched/fair.c @@ -1596,7 +1596,7 @@ static void task_numa_compare(struct tas */ if (cur) { /* Skip this swap candidate if cannot move to the source cpu */ - if (!cpumask_test_cpu(env->src_cpu, &cur->cpus_allowed)) + if (!cpumask_test_cpu(env->src_cpu, cur->cpus_ptr)) goto unlock; /* @@ -1706,7 +1706,7 @@ static void task_numa_find_cpu(struct ta for_each_cpu(cpu, cpumask_of_node(env->dst_nid)) { /* Skip this CPU if the source task cannot migrate */ - if (!cpumask_test_cpu(cpu, &env->p->cpus_allowed)) + if (!cpumask_test_cpu(cpu, env->p->cpus_ptr)) continue; env->dst_cpu = cpu; @@ -3840,7 +3840,7 @@ check_preempt_tick(struct cfs_rq *cfs_rq ideal_runtime = sched_slice(cfs_rq, curr); delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime; if (delta_exec > ideal_runtime) { - resched_curr(rq_of(cfs_rq)); + resched_curr_lazy(rq_of(cfs_rq)); /* * The current task ran long enough, ensure it doesn't get * re-elected due to buddy favours. @@ -3864,7 +3864,7 @@ check_preempt_tick(struct cfs_rq *cfs_rq return; if (delta > ideal_runtime) - resched_curr(rq_of(cfs_rq)); + resched_curr_lazy(rq_of(cfs_rq)); } static void @@ -4006,7 +4006,7 @@ entity_tick(struct cfs_rq *cfs_rq, struc * validating it and just reschedule. */ if (queued) { - resched_curr(rq_of(cfs_rq)); + resched_curr_lazy(rq_of(cfs_rq)); return; } /* @@ -4188,7 +4188,7 @@ static void __account_cfs_rq_runtime(str * hierarchy can be throttled */ if (!assign_cfs_rq_runtime(cfs_rq) && likely(cfs_rq->curr)) - resched_curr(rq_of(cfs_rq)); + resched_curr_lazy(rq_of(cfs_rq)); } static __always_inline @@ -4837,7 +4837,7 @@ static void hrtick_start_fair(struct rq if (delta < 0) { if (rq->curr == p) - resched_curr(rq); + resched_curr_lazy(rq); return; } hrtick_start(rq, delta); @@ -5475,7 +5475,7 @@ find_idlest_group(struct sched_domain *s /* Skip over this group if it has no CPUs allowed */ if (!cpumask_intersects(sched_group_span(group), - &p->cpus_allowed)) + p->cpus_ptr)) continue; local_group = cpumask_test_cpu(this_cpu, @@ -5595,7 +5595,7 @@ find_idlest_cpu(struct sched_group *grou return cpumask_first(sched_group_span(group)); /* Traverse only the allowed CPUs */ - for_each_cpu_and(i, sched_group_span(group), &p->cpus_allowed) { + for_each_cpu_and(i, sched_group_span(group), p->cpus_ptr) { if (idle_cpu(i)) { struct rq *rq = cpu_rq(i); struct cpuidle_state *idle = idle_get_state(rq); @@ -5697,7 +5697,7 @@ static int select_idle_core(struct task_ if (!test_idle_cores(target, false)) return -1; - cpumask_and(cpus, sched_domain_span(sd), &p->cpus_allowed); + cpumask_and(cpus, sched_domain_span(sd), p->cpus_ptr); for_each_cpu_wrap(core, cpus, target) { bool idle = true; @@ -5731,7 +5731,7 @@ static int select_idle_smt(struct task_s return -1; for_each_cpu(cpu, cpu_smt_mask(target)) { - if (!cpumask_test_cpu(cpu, &p->cpus_allowed)) + if (!cpumask_test_cpu(cpu, p->cpus_ptr)) continue; if (idle_cpu(cpu)) return cpu; @@ -5794,7 +5794,7 @@ static int select_idle_cpu(struct task_s for_each_cpu_wrap(cpu, sched_domain_span(sd), target) { if (!--nr) return -1; - if (!cpumask_test_cpu(cpu, &p->cpus_allowed)) + if (!cpumask_test_cpu(cpu, p->cpus_ptr)) continue; if (idle_cpu(cpu)) break; @@ -5949,7 +5949,7 @@ select_task_rq_fair(struct task_struct * if (sd_flag & SD_BALANCE_WAKE) { record_wakee(p); want_affine = !wake_wide(p) && !wake_cap(p, cpu, prev_cpu) - && cpumask_test_cpu(cpu, &p->cpus_allowed); + && cpumask_test_cpu(cpu, p->cpus_ptr); } rcu_read_lock(); @@ -6230,7 +6230,7 @@ static void check_preempt_wakeup(struct return; preempt: - resched_curr(rq); + resched_curr_lazy(rq); /* * Only set the backward buddy when the current task is still * on the rq. This can happen when a wakeup gets interleaved @@ -6698,14 +6698,14 @@ int can_migrate_task(struct task_struct /* * We do not migrate tasks that are: * 1) throttled_lb_pair, or - * 2) cannot be migrated to this CPU due to cpus_allowed, or + * 2) cannot be migrated to this CPU due to cpus_ptr, or * 3) running (obviously), or * 4) are cache-hot on their current CPU. */ if (throttled_lb_pair(task_group(p), env->src_cpu, env->dst_cpu)) return 0; - if (!cpumask_test_cpu(env->dst_cpu, &p->cpus_allowed)) { + if (!cpumask_test_cpu(env->dst_cpu, p->cpus_ptr)) { int cpu; schedstat_inc(p->se.statistics.nr_failed_migrations_affine); @@ -6725,7 +6725,7 @@ int can_migrate_task(struct task_struct /* Prevent to re-select dst_cpu via env's cpus */ for_each_cpu_and(cpu, env->dst_grpmask, env->cpus) { - if (cpumask_test_cpu(cpu, &p->cpus_allowed)) { + if (cpumask_test_cpu(cpu, p->cpus_ptr)) { env->flags |= LBF_DST_PINNED; env->new_dst_cpu = cpu; break; @@ -7294,7 +7294,7 @@ check_cpu_capacity(struct rq *rq, struct /* * Group imbalance indicates (and tries to solve) the problem where balancing - * groups is inadequate due to ->cpus_allowed constraints. + * groups is inadequate due to ->cpus_ptr constraints. * * Imagine a situation of two groups of 4 cpus each and 4 tasks each with a * cpumask covering 1 cpu of the first group and 3 cpus of the second group. @@ -7870,7 +7870,7 @@ static struct sched_group *find_busiest_ /* * If the busiest group is imbalanced the below checks don't * work because they assume all things are equal, which typically - * isn't true due to cpus_allowed constraints and the like. + * isn't true due to cpus_ptr constraints and the like. */ if (busiest->group_type == group_imbalanced) goto force_balance; @@ -8262,7 +8262,7 @@ more_balance: * if the curr task on busiest cpu can't be * moved to this_cpu */ - if (!cpumask_test_cpu(this_cpu, &busiest->curr->cpus_allowed)) { + if (!cpumask_test_cpu(this_cpu, busiest->curr->cpus_ptr)) { raw_spin_unlock_irqrestore(&busiest->lock, flags); env.flags |= LBF_ALL_PINNED; @@ -9084,7 +9084,7 @@ static void task_fork_fair(struct task_s * 'current' within the tree based on its new key value. */ swap(curr->vruntime, se->vruntime); - resched_curr(rq); + resched_curr_lazy(rq); } se->vruntime -= cfs_rq->min_vruntime; @@ -9108,7 +9108,7 @@ prio_changed_fair(struct rq *rq, struct */ if (rq->curr == p) { if (p->prio > oldprio) - resched_curr(rq); + resched_curr_lazy(rq); } else check_preempt_curr(rq, p, 0); } Index: linux-4.14.15-rt12/kernel/sched/features.h =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/features.h +++ linux-4.14.15-rt12/kernel/sched/features.h @@ -46,11 +46,19 @@ SCHED_FEAT(LB_BIAS, true) */ SCHED_FEAT(NONTASK_CAPACITY, true) +#ifdef CONFIG_PREEMPT_RT_FULL +SCHED_FEAT(TTWU_QUEUE, false) +# ifdef CONFIG_PREEMPT_LAZY +SCHED_FEAT(PREEMPT_LAZY, true) +# endif +#else + /* * Queue remote wakeups on the target CPU and process them * using the scheduler IPI. Reduces rq->lock contention/bounces. */ SCHED_FEAT(TTWU_QUEUE, true) +#endif /* * When doing wakeups, attempt to limit superfluous scans of the LLC domain. Index: linux-4.14.15-rt12/kernel/sched/rt.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/rt.c +++ linux-4.14.15-rt12/kernel/sched/rt.c @@ -47,8 +47,8 @@ void init_rt_bandwidth(struct rt_bandwid raw_spin_lock_init(&rt_b->rt_runtime_lock); - hrtimer_init(&rt_b->rt_period_timer, - CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hrtimer_init(&rt_b->rt_period_timer, CLOCK_MONOTONIC, + HRTIMER_MODE_REL_HARD); rt_b->rt_period_timer.function = sched_rt_period_timer; } @@ -1592,7 +1592,7 @@ static void put_prev_task_rt(struct rq * static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu) { if (!task_running(rq, p) && - cpumask_test_cpu(cpu, &p->cpus_allowed)) + cpumask_test_cpu(cpu, p->cpus_ptr)) return 1; return 0; } @@ -1727,7 +1727,7 @@ static struct rq *find_lock_lowest_rq(st * Also make sure that it wasn't scheduled on its rq. */ if (unlikely(task_rq(task) != rq || - !cpumask_test_cpu(lowest_rq->cpu, &task->cpus_allowed) || + !cpumask_test_cpu(lowest_rq->cpu, task->cpus_ptr) || task_running(rq, task) || !rt_task(task) || !task_on_rq_queued(task))) { Index: linux-4.14.15-rt12/kernel/sched/sched.h =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/sched.h +++ linux-4.14.15-rt12/kernel/sched/sched.h @@ -1354,6 +1354,7 @@ static inline void finish_lock_switch(st #define WF_SYNC 0x01 /* waker goes to sleep after wakeup */ #define WF_FORK 0x02 /* child wakeup after fork */ #define WF_MIGRATED 0x4 /* internal use, task got migrated */ +#define WF_LOCK_SLEEPER 0x08 /* wakeup spinlock "sleeper" */ /* * To aid in avoiding the subversion of "niceness" due to uneven distribution @@ -1545,6 +1546,15 @@ extern void init_sched_fair_class(void); extern void resched_curr(struct rq *rq); extern void resched_cpu(int cpu); +#ifdef CONFIG_PREEMPT_LAZY +extern void resched_curr_lazy(struct rq *rq); +#else +static inline void resched_curr_lazy(struct rq *rq) +{ + resched_curr(rq); +} +#endif + extern struct rt_bandwidth def_rt_bandwidth; extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime); Index: linux-4.14.15-rt12/kernel/sched/swait.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/swait.c +++ linux-4.14.15-rt12/kernel/sched/swait.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include #include +#include void __init_swait_queue_head(struct swait_queue_head *q, const char *name, struct lock_class_key *key) @@ -30,6 +31,25 @@ void swake_up_locked(struct swait_queue_ } EXPORT_SYMBOL(swake_up_locked); +void swake_up_all_locked(struct swait_queue_head *q) +{ + struct swait_queue *curr; + int wakes = 0; + + while (!list_empty(&q->task_list)) { + + curr = list_first_entry(&q->task_list, typeof(*curr), + task_list); + wake_up_process(curr->task); + list_del_init(&curr->task_list); + wakes++; + } + if (pm_in_action) + return; + WARN(wakes > 2, "complete_all() with %d waiters\n", wakes); +} +EXPORT_SYMBOL(swake_up_all_locked); + void swake_up(struct swait_queue_head *q) { unsigned long flags; @@ -49,6 +69,7 @@ void swake_up_all(struct swait_queue_hea struct swait_queue *curr; LIST_HEAD(tmp); + WARN_ON(irqs_disabled()); raw_spin_lock_irq(&q->lock); list_splice_init(&q->task_list, &tmp); while (!list_empty(&tmp)) { Index: linux-4.14.15-rt12/kernel/sched/swork.c =================================================================== --- /dev/null +++ linux-4.14.15-rt12/kernel/sched/swork.c @@ -0,0 +1,173 @@ +/* + * Copyright (C) 2014 BMW Car IT GmbH, Daniel Wagner daniel.wagner@bmw-carit.de + * + * Provides a framework for enqueuing callbacks from irq context + * PREEMPT_RT_FULL safe. The callbacks are executed in kthread context. + */ + +#include +#include +#include +#include +#include +#include + +#define SWORK_EVENT_PENDING (1 << 0) + +static DEFINE_MUTEX(worker_mutex); +static struct sworker *glob_worker; + +struct sworker { + struct list_head events; + struct swait_queue_head wq; + + raw_spinlock_t lock; + + struct task_struct *task; + int refs; +}; + +static bool swork_readable(struct sworker *worker) +{ + bool r; + + if (kthread_should_stop()) + return true; + + raw_spin_lock_irq(&worker->lock); + r = !list_empty(&worker->events); + raw_spin_unlock_irq(&worker->lock); + + return r; +} + +static int swork_kthread(void *arg) +{ + struct sworker *worker = arg; + + for (;;) { + swait_event_interruptible(worker->wq, + swork_readable(worker)); + if (kthread_should_stop()) + break; + + raw_spin_lock_irq(&worker->lock); + while (!list_empty(&worker->events)) { + struct swork_event *sev; + + sev = list_first_entry(&worker->events, + struct swork_event, item); + list_del(&sev->item); + raw_spin_unlock_irq(&worker->lock); + + WARN_ON_ONCE(!test_and_clear_bit(SWORK_EVENT_PENDING, + &sev->flags)); + sev->func(sev); + raw_spin_lock_irq(&worker->lock); + } + raw_spin_unlock_irq(&worker->lock); + } + return 0; +} + +static struct sworker *swork_create(void) +{ + struct sworker *worker; + + worker = kzalloc(sizeof(*worker), GFP_KERNEL); + if (!worker) + return ERR_PTR(-ENOMEM); + + INIT_LIST_HEAD(&worker->events); + raw_spin_lock_init(&worker->lock); + init_swait_queue_head(&worker->wq); + + worker->task = kthread_run(swork_kthread, worker, "kswork"); + if (IS_ERR(worker->task)) { + kfree(worker); + return ERR_PTR(-ENOMEM); + } + + return worker; +} + +static void swork_destroy(struct sworker *worker) +{ + kthread_stop(worker->task); + + WARN_ON(!list_empty(&worker->events)); + kfree(worker); +} + +/** + * swork_queue - queue swork + * + * Returns %false if @work was already on a queue, %true otherwise. + * + * The work is queued and processed on a random CPU + */ +bool swork_queue(struct swork_event *sev) +{ + unsigned long flags; + + if (test_and_set_bit(SWORK_EVENT_PENDING, &sev->flags)) + return false; + + raw_spin_lock_irqsave(&glob_worker->lock, flags); + list_add_tail(&sev->item, &glob_worker->events); + raw_spin_unlock_irqrestore(&glob_worker->lock, flags); + + swake_up(&glob_worker->wq); + return true; +} +EXPORT_SYMBOL_GPL(swork_queue); + +/** + * swork_get - get an instance of the sworker + * + * Returns an negative error code if the initialization if the worker did not + * work, %0 otherwise. + * + */ +int swork_get(void) +{ + struct sworker *worker; + + mutex_lock(&worker_mutex); + if (!glob_worker) { + worker = swork_create(); + if (IS_ERR(worker)) { + mutex_unlock(&worker_mutex); + return -ENOMEM; + } + + glob_worker = worker; + } + + glob_worker->refs++; + mutex_unlock(&worker_mutex); + + return 0; +} +EXPORT_SYMBOL_GPL(swork_get); + +/** + * swork_put - puts an instance of the sworker + * + * Will destroy the sworker thread. This function must not be called until all + * queued events have been completed. + */ +void swork_put(void) +{ + mutex_lock(&worker_mutex); + + glob_worker->refs--; + if (glob_worker->refs > 0) + goto out; + + swork_destroy(glob_worker); + glob_worker = NULL; +out: + mutex_unlock(&worker_mutex); +} +EXPORT_SYMBOL_GPL(swork_put); Index: linux-4.14.15-rt12/kernel/sched/topology.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/sched/topology.c +++ linux-4.14.15-rt12/kernel/sched/topology.c @@ -286,6 +286,7 @@ static int init_rootdomain(struct root_d rd->rto_cpu = -1; raw_spin_lock_init(&rd->rto_lock); init_irq_work(&rd->rto_push_work, rto_push_irq_work_func); + rd->rto_push_work.flags |= IRQ_WORK_HARD_IRQ; #endif init_dl_bw(&rd->dl_bw); Index: linux-4.14.15-rt12/kernel/signal.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/signal.c +++ linux-4.14.15-rt12/kernel/signal.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -360,13 +361,30 @@ static bool task_participate_group_stop( return false; } +static inline struct sigqueue *get_task_cache(struct task_struct *t) +{ + struct sigqueue *q = t->sigqueue_cache; + + if (cmpxchg(&t->sigqueue_cache, q, NULL) != q) + return NULL; + return q; +} + +static inline int put_task_cache(struct task_struct *t, struct sigqueue *q) +{ + if (cmpxchg(&t->sigqueue_cache, NULL, q) == NULL) + return 0; + return 1; +} + /* * allocate a new signal queue record * - this may be called without locks if and only if t == current, otherwise an * appropriate lock must be held to stop the target task from exiting */ static struct sigqueue * -__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimit) +__sigqueue_do_alloc(int sig, struct task_struct *t, gfp_t flags, + int override_rlimit, int fromslab) { struct sigqueue *q = NULL; struct user_struct *user; @@ -383,7 +401,10 @@ __sigqueue_alloc(int sig, struct task_st if (override_rlimit || atomic_read(&user->sigpending) <= task_rlimit(t, RLIMIT_SIGPENDING)) { - q = kmem_cache_alloc(sigqueue_cachep, flags); + if (!fromslab) + q = get_task_cache(t); + if (!q) + q = kmem_cache_alloc(sigqueue_cachep, flags); } else { print_dropped_signal(sig); } @@ -400,6 +421,13 @@ __sigqueue_alloc(int sig, struct task_st return q; } +static struct sigqueue * +__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, + int override_rlimit) +{ + return __sigqueue_do_alloc(sig, t, flags, override_rlimit, 0); +} + static void __sigqueue_free(struct sigqueue *q) { if (q->flags & SIGQUEUE_PREALLOC) @@ -409,6 +437,21 @@ static void __sigqueue_free(struct sigqu kmem_cache_free(sigqueue_cachep, q); } +static void sigqueue_free_current(struct sigqueue *q) +{ + struct user_struct *up; + + if (q->flags & SIGQUEUE_PREALLOC) + return; + + up = q->user; + if (rt_prio(current->normal_prio) && !put_task_cache(current, q)) { + atomic_dec(&up->sigpending); + free_uid(up); + } else + __sigqueue_free(q); +} + void flush_sigqueue(struct sigpending *queue) { struct sigqueue *q; @@ -422,6 +465,21 @@ void flush_sigqueue(struct sigpending *q } /* + * Called from __exit_signal. Flush tsk->pending and + * tsk->sigqueue_cache + */ +void flush_task_sigqueue(struct task_struct *tsk) +{ + struct sigqueue *q; + + flush_sigqueue(&tsk->pending); + + q = get_task_cache(tsk); + if (q) + kmem_cache_free(sigqueue_cachep, q); +} + +/* * Flush all pending signals for this kthread. */ void flush_signals(struct task_struct *t) @@ -542,7 +600,7 @@ still_pending: (info->si_code == SI_TIMER) && (info->si_sys_private); - __sigqueue_free(first); + sigqueue_free_current(first); } else { /* * Ok, it wasn't in the queue. This must be @@ -578,6 +636,8 @@ int dequeue_signal(struct task_struct *t bool resched_timer = false; int signr; + WARN_ON_ONCE(tsk != current); + /* We only dequeue private signals from ourselves, we don't let * signalfd steal them */ @@ -1177,8 +1237,8 @@ int do_send_sig_info(int sig, struct sig * We don't want to have recursive SIGSEGV's etc, for example, * that is why we also clear SIGNAL_UNKILLABLE. */ -int -force_sig_info(int sig, struct siginfo *info, struct task_struct *t) +static int +do_force_sig_info(int sig, struct siginfo *info, struct task_struct *t) { unsigned long int flags; int ret, blocked, ignored; @@ -1207,6 +1267,39 @@ force_sig_info(int sig, struct siginfo * return ret; } +int force_sig_info(int sig, struct siginfo *info, struct task_struct *t) +{ +/* + * On some archs, PREEMPT_RT has to delay sending a signal from a trap + * since it can not enable preemption, and the signal code's spin_locks + * turn into mutexes. Instead, it must set TIF_NOTIFY_RESUME which will + * send the signal on exit of the trap. + */ +#ifdef ARCH_RT_DELAYS_SIGNAL_SEND + if (in_atomic()) { + if (WARN_ON_ONCE(t != current)) + return 0; + if (WARN_ON_ONCE(t->forced_info.si_signo)) + return 0; + + if (is_si_special(info)) { + WARN_ON_ONCE(info != SEND_SIG_PRIV); + t->forced_info.si_signo = sig; + t->forced_info.si_errno = 0; + t->forced_info.si_code = SI_KERNEL; + t->forced_info.si_pid = 0; + t->forced_info.si_uid = 0; + } else { + t->forced_info = *info; + } + + set_tsk_thread_flag(t, TIF_NOTIFY_RESUME); + return 0; + } +#endif + return do_force_sig_info(sig, info, t); +} + /* * Nuke all other threads in the group. */ @@ -1241,12 +1334,12 @@ struct sighand_struct *__lock_task_sigha * Disable interrupts early to avoid deadlocks. * See rcu_read_unlock() comment header for details. */ - local_irq_save(*flags); + local_irq_save_nort(*flags); rcu_read_lock(); sighand = rcu_dereference(tsk->sighand); if (unlikely(sighand == NULL)) { rcu_read_unlock(); - local_irq_restore(*flags); + local_irq_restore_nort(*flags); break; } /* @@ -1267,7 +1360,7 @@ struct sighand_struct *__lock_task_sigha } spin_unlock(&sighand->siglock); rcu_read_unlock(); - local_irq_restore(*flags); + local_irq_restore_nort(*flags); } return sighand; @@ -1514,7 +1607,8 @@ EXPORT_SYMBOL(kill_pid); */ struct sigqueue *sigqueue_alloc(void) { - struct sigqueue *q = __sigqueue_alloc(-1, current, GFP_KERNEL, 0); + /* Preallocated sigqueue objects always from the slabcache ! */ + struct sigqueue *q = __sigqueue_do_alloc(-1, current, GFP_KERNEL, 0, 1); if (q) q->flags |= SIGQUEUE_PREALLOC; @@ -1875,15 +1969,7 @@ static void ptrace_stop(int exit_code, i if (gstop_done && ptrace_reparented(current)) do_notify_parent_cldstop(current, false, why); - /* - * Don't want to allow preemption here, because - * sys_ptrace() needs this task to be inactive. - * - * XXX: implement read_unlock_no_resched(). - */ - preempt_disable(); read_unlock(&tasklist_lock); - preempt_enable_no_resched(); freezable_schedule(); } else { /* Index: linux-4.14.15-rt12/kernel/softirq.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/softirq.c +++ linux-4.14.15-rt12/kernel/softirq.c @@ -21,11 +21,14 @@ #include #include #include +#include #include #include #include #include +#include #include +#include #define CREATE_TRACE_POINTS #include @@ -56,12 +59,108 @@ EXPORT_SYMBOL(irq_stat); static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp; DEFINE_PER_CPU(struct task_struct *, ksoftirqd); +#ifdef CONFIG_PREEMPT_RT_FULL +#define TIMER_SOFTIRQS ((1 << TIMER_SOFTIRQ) | (1 << HRTIMER_SOFTIRQ)) +DEFINE_PER_CPU(struct task_struct *, ktimer_softirqd); +#endif const char * const softirq_to_name[NR_SOFTIRQS] = { "HI", "TIMER", "NET_TX", "NET_RX", "BLOCK", "IRQ_POLL", "TASKLET", "SCHED", "HRTIMER", "RCU" }; +#ifdef CONFIG_NO_HZ_COMMON +# ifdef CONFIG_PREEMPT_RT_FULL + +struct softirq_runner { + struct task_struct *runner[NR_SOFTIRQS]; +}; + +static DEFINE_PER_CPU(struct softirq_runner, softirq_runners); + +static inline void softirq_set_runner(unsigned int sirq) +{ + struct softirq_runner *sr = this_cpu_ptr(&softirq_runners); + + sr->runner[sirq] = current; +} + +static inline void softirq_clr_runner(unsigned int sirq) +{ + struct softirq_runner *sr = this_cpu_ptr(&softirq_runners); + + sr->runner[sirq] = NULL; +} + +/* + * On preempt-rt a softirq running context might be blocked on a + * lock. There might be no other runnable task on this CPU because the + * lock owner runs on some other CPU. So we have to go into idle with + * the pending bit set. Therefor we need to check this otherwise we + * warn about false positives which confuses users and defeats the + * whole purpose of this test. + * + * This code is called with interrupts disabled. + */ +void softirq_check_pending_idle(void) +{ + static int rate_limit; + struct softirq_runner *sr = this_cpu_ptr(&softirq_runners); + u32 warnpending; + int i; + + if (rate_limit >= 10) + return; + + warnpending = local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK; + for (i = 0; i < NR_SOFTIRQS; i++) { + struct task_struct *tsk = sr->runner[i]; + + /* + * The wakeup code in rtmutex.c wakes up the task + * _before_ it sets pi_blocked_on to NULL under + * tsk->pi_lock. So we need to check for both: state + * and pi_blocked_on. + */ + if (tsk) { + raw_spin_lock(&tsk->pi_lock); + if (tsk->pi_blocked_on || tsk->state == TASK_RUNNING) { + /* Clear all bits pending in that task */ + warnpending &= ~(tsk->softirqs_raised); + warnpending &= ~(1 << i); + } + raw_spin_unlock(&tsk->pi_lock); + } + } + + if (warnpending) { + printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n", + warnpending); + rate_limit++; + } +} +# else +/* + * On !PREEMPT_RT we just printk rate limited: + */ +void softirq_check_pending_idle(void) +{ + static int rate_limit; + + if (rate_limit < 10 && + (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) { + printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n", + local_softirq_pending()); + rate_limit++; + } +} +# endif + +#else /* !CONFIG_NO_HZ_COMMON */ +static inline void softirq_set_runner(unsigned int sirq) { } +static inline void softirq_clr_runner(unsigned int sirq) { } +#endif + /* * we cannot loop indefinitely here to avoid userspace starvation, * but we also don't want to introduce a worst case 1/HZ latency @@ -77,6 +176,38 @@ static void wakeup_softirqd(void) wake_up_process(tsk); } +#ifdef CONFIG_PREEMPT_RT_FULL +static void wakeup_timer_softirqd(void) +{ + /* Interrupts are disabled: no need to stop preemption */ + struct task_struct *tsk = __this_cpu_read(ktimer_softirqd); + + if (tsk && tsk->state != TASK_RUNNING) + wake_up_process(tsk); +} +#endif + +static void handle_softirq(unsigned int vec_nr) +{ + struct softirq_action *h = softirq_vec + vec_nr; + int prev_count; + + prev_count = preempt_count(); + + kstat_incr_softirqs_this_cpu(vec_nr); + + trace_softirq_entry(vec_nr); + h->action(h); + trace_softirq_exit(vec_nr); + if (unlikely(prev_count != preempt_count())) { + pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n", + vec_nr, softirq_to_name[vec_nr], h->action, + prev_count, preempt_count()); + preempt_count_set(prev_count); + } +} + +#ifndef CONFIG_PREEMPT_RT_FULL /* * If ksoftirqd is scheduled, we do not want to process pending softirqs * right now. Let ksoftirqd handle this at its own rate, to get fairness. @@ -88,6 +219,47 @@ static bool ksoftirqd_running(void) return tsk && (tsk->state == TASK_RUNNING); } +static inline int ksoftirqd_softirq_pending(void) +{ + return local_softirq_pending(); +} + +static void handle_pending_softirqs(u32 pending) +{ + struct softirq_action *h = softirq_vec; + int softirq_bit; + + local_irq_enable(); + + h = softirq_vec; + + while ((softirq_bit = ffs(pending))) { + unsigned int vec_nr; + + h += softirq_bit - 1; + vec_nr = h - softirq_vec; + handle_softirq(vec_nr); + + h++; + pending >>= softirq_bit; + } + + rcu_bh_qs(); + local_irq_disable(); +} + +static void run_ksoftirqd(unsigned int cpu) +{ + local_irq_disable(); + if (ksoftirqd_softirq_pending()) { + __do_softirq(); + local_irq_enable(); + cond_resched_rcu_qs(); + return; + } + local_irq_enable(); +} + /* * preempt_count and SOFTIRQ_OFFSET usage: * - preempt_count is changed by SOFTIRQ_OFFSET on entering or leaving @@ -243,10 +415,8 @@ asmlinkage __visible void __softirq_entr unsigned long end = jiffies + MAX_SOFTIRQ_TIME; unsigned long old_flags = current->flags; int max_restart = MAX_SOFTIRQ_RESTART; - struct softirq_action *h; bool in_hardirq; __u32 pending; - int softirq_bit; /* * Mask out PF_MEMALLOC s current task context is borrowed for the @@ -265,36 +435,7 @@ restart: /* Reset the pending bitmask before enabling irqs */ set_softirq_pending(0); - local_irq_enable(); - - h = softirq_vec; - - while ((softirq_bit = ffs(pending))) { - unsigned int vec_nr; - int prev_count; - - h += softirq_bit - 1; - - vec_nr = h - softirq_vec; - prev_count = preempt_count(); - - kstat_incr_softirqs_this_cpu(vec_nr); - - trace_softirq_entry(vec_nr); - h->action(h); - trace_softirq_exit(vec_nr); - if (unlikely(prev_count != preempt_count())) { - pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n", - vec_nr, softirq_to_name[vec_nr], h->action, - prev_count, preempt_count()); - preempt_count_set(prev_count); - } - h++; - pending >>= softirq_bit; - } - - rcu_bh_qs(); - local_irq_disable(); + handle_pending_softirqs(pending); pending = local_softirq_pending(); if (pending) { @@ -331,6 +472,309 @@ asmlinkage __visible void do_softirq(voi } /* + * This function must run with irqs disabled! + */ +void raise_softirq_irqoff(unsigned int nr) +{ + __raise_softirq_irqoff(nr); + + /* + * If we're in an interrupt or softirq, we're done + * (this also catches softirq-disabled code). We will + * actually run the softirq once we return from + * the irq or softirq. + * + * Otherwise we wake up ksoftirqd to make sure we + * schedule the softirq soon. + */ + if (!in_interrupt()) + wakeup_softirqd(); +} + +void __raise_softirq_irqoff(unsigned int nr) +{ + trace_softirq_raise(nr); + or_softirq_pending(1UL << nr); +} + +static inline void local_bh_disable_nort(void) { local_bh_disable(); } +static inline void _local_bh_enable_nort(void) { _local_bh_enable(); } +static void ksoftirqd_set_sched_params(unsigned int cpu) { } + +#else /* !PREEMPT_RT_FULL */ + +/* + * On RT we serialize softirq execution with a cpu local lock per softirq + */ +static DEFINE_PER_CPU(struct local_irq_lock [NR_SOFTIRQS], local_softirq_locks); + +void __init softirq_early_init(void) +{ + int i; + + for (i = 0; i < NR_SOFTIRQS; i++) + local_irq_lock_init(local_softirq_locks[i]); +} + +static void lock_softirq(int which) +{ + local_lock(local_softirq_locks[which]); +} + +static void unlock_softirq(int which) +{ + local_unlock(local_softirq_locks[which]); +} + +static void do_single_softirq(int which) +{ + unsigned long old_flags = current->flags; + + current->flags &= ~PF_MEMALLOC; + vtime_account_irq_enter(current); + current->flags |= PF_IN_SOFTIRQ; + lockdep_softirq_enter(); + local_irq_enable(); + handle_softirq(which); + local_irq_disable(); + lockdep_softirq_exit(); + current->flags &= ~PF_IN_SOFTIRQ; + vtime_account_irq_enter(current); + current_restore_flags(old_flags, PF_MEMALLOC); +} + +/* + * Called with interrupts disabled. Process softirqs which were raised + * in current context (or on behalf of ksoftirqd). + */ +static void do_current_softirqs(void) +{ + while (current->softirqs_raised) { + int i = __ffs(current->softirqs_raised); + unsigned int pending, mask = (1U << i); + + current->softirqs_raised &= ~mask; + local_irq_enable(); + + /* + * If the lock is contended, we boost the owner to + * process the softirq or leave the critical section + * now. + */ + lock_softirq(i); + local_irq_disable(); + softirq_set_runner(i); + /* + * Check with the local_softirq_pending() bits, + * whether we need to process this still or if someone + * else took care of it. + */ + pending = local_softirq_pending(); + if (pending & mask) { + set_softirq_pending(pending & ~mask); + do_single_softirq(i); + } + softirq_clr_runner(i); + WARN_ON(current->softirq_nestcnt != 1); + local_irq_enable(); + unlock_softirq(i); + local_irq_disable(); + } +} + +void __local_bh_disable(void) +{ + if (++current->softirq_nestcnt == 1) + migrate_disable(); +} +EXPORT_SYMBOL(__local_bh_disable); + +void __local_bh_enable(void) +{ + if (WARN_ON(current->softirq_nestcnt == 0)) + return; + + local_irq_disable(); + if (current->softirq_nestcnt == 1 && current->softirqs_raised) + do_current_softirqs(); + local_irq_enable(); + + if (--current->softirq_nestcnt == 0) + migrate_enable(); +} +EXPORT_SYMBOL(__local_bh_enable); + +void _local_bh_enable(void) +{ + if (WARN_ON(current->softirq_nestcnt == 0)) + return; + if (--current->softirq_nestcnt == 0) + migrate_enable(); +} +EXPORT_SYMBOL(_local_bh_enable); + +int in_serving_softirq(void) +{ + return current->flags & PF_IN_SOFTIRQ; +} +EXPORT_SYMBOL(in_serving_softirq); + +/* Called with preemption disabled */ +static void run_ksoftirqd(unsigned int cpu) +{ + local_irq_disable(); + current->softirq_nestcnt++; + + do_current_softirqs(); + current->softirq_nestcnt--; + local_irq_enable(); + cond_resched_rcu_qs(); +} + +/* + * Called from netif_rx_ni(). Preemption enabled, but migration + * disabled. So the cpu can't go away under us. + */ +void thread_do_softirq(void) +{ + if (!in_serving_softirq() && current->softirqs_raised) { + current->softirq_nestcnt++; + do_current_softirqs(); + current->softirq_nestcnt--; + } +} + +static void do_raise_softirq_irqoff(unsigned int nr) +{ + unsigned int mask; + + mask = 1UL << nr; + + trace_softirq_raise(nr); + or_softirq_pending(mask); + + /* + * If we are not in a hard interrupt and inside a bh disabled + * region, we simply raise the flag on current. local_bh_enable() + * will make sure that the softirq is executed. Otherwise we + * delegate it to ksoftirqd. + */ + if (!in_irq() && current->softirq_nestcnt) + current->softirqs_raised |= mask; + else if (!__this_cpu_read(ksoftirqd) || !__this_cpu_read(ktimer_softirqd)) + return; + + if (mask & TIMER_SOFTIRQS) + __this_cpu_read(ktimer_softirqd)->softirqs_raised |= mask; + else + __this_cpu_read(ksoftirqd)->softirqs_raised |= mask; +} + +static void wakeup_proper_softirq(unsigned int nr) +{ + if ((1UL << nr) & TIMER_SOFTIRQS) + wakeup_timer_softirqd(); + else + wakeup_softirqd(); +} + +void __raise_softirq_irqoff(unsigned int nr) +{ + do_raise_softirq_irqoff(nr); + if (!in_irq() && !current->softirq_nestcnt) + wakeup_proper_softirq(nr); +} + +/* + * Same as __raise_softirq_irqoff() but will process them in ksoftirqd + */ +void __raise_softirq_irqoff_ksoft(unsigned int nr) +{ + unsigned int mask; + + if (WARN_ON_ONCE(!__this_cpu_read(ksoftirqd) || + !__this_cpu_read(ktimer_softirqd))) + return; + mask = 1UL << nr; + + trace_softirq_raise(nr); + or_softirq_pending(mask); + if (mask & TIMER_SOFTIRQS) + __this_cpu_read(ktimer_softirqd)->softirqs_raised |= mask; + else + __this_cpu_read(ksoftirqd)->softirqs_raised |= mask; + wakeup_proper_softirq(nr); +} + +/* + * This function must run with irqs disabled! + */ +void raise_softirq_irqoff(unsigned int nr) +{ + do_raise_softirq_irqoff(nr); + + /* + * If we're in an hard interrupt we let irq return code deal + * with the wakeup of ksoftirqd. + */ + if (in_irq()) + return; + /* + * If we are in thread context but outside of a bh disabled + * region, we need to wake ksoftirqd as well. + * + * CHECKME: Some of the places which do that could be wrapped + * into local_bh_disable/enable pairs. Though it's unclear + * whether this is worth the effort. To find those places just + * raise a WARN() if the condition is met. + */ + if (!current->softirq_nestcnt) + wakeup_proper_softirq(nr); +} + +static inline int ksoftirqd_softirq_pending(void) +{ + return current->softirqs_raised; +} + +static inline void local_bh_disable_nort(void) { } +static inline void _local_bh_enable_nort(void) { } + +static inline void ksoftirqd_set_sched_params(unsigned int cpu) +{ + /* Take over all but timer pending softirqs when starting */ + local_irq_disable(); + current->softirqs_raised = local_softirq_pending() & ~TIMER_SOFTIRQS; + local_irq_enable(); +} + +static inline void ktimer_softirqd_set_sched_params(unsigned int cpu) +{ + struct sched_param param = { .sched_priority = 1 }; + + sched_setscheduler(current, SCHED_FIFO, ¶m); + + /* Take over timer pending softirqs when starting */ + local_irq_disable(); + current->softirqs_raised = local_softirq_pending() & TIMER_SOFTIRQS; + local_irq_enable(); +} + +static inline void ktimer_softirqd_clr_sched_params(unsigned int cpu, + bool online) +{ + struct sched_param param = { .sched_priority = 0 }; + + sched_setscheduler(current, SCHED_NORMAL, ¶m); +} + +static int ktimer_softirqd_should_run(unsigned int cpu) +{ + return current->softirqs_raised; +} + +#endif /* PREEMPT_RT_FULL */ +/* * Enter an interrupt context. */ void irq_enter(void) @@ -341,9 +785,9 @@ void irq_enter(void) * Prevent raise_softirq from needlessly waking up ksoftirqd * here, as softirq will be serviced on return from interrupt. */ - local_bh_disable(); + local_bh_disable_nort(); tick_irq_enter(); - _local_bh_enable(); + _local_bh_enable_nort(); } __irq_enter(); @@ -351,6 +795,7 @@ void irq_enter(void) static inline void invoke_softirq(void) { +#ifndef CONFIG_PREEMPT_RT_FULL if (ksoftirqd_running()) return; @@ -373,6 +818,18 @@ static inline void invoke_softirq(void) } else { wakeup_softirqd(); } +#else /* PREEMPT_RT_FULL */ + unsigned long flags; + + local_irq_save(flags); + if (__this_cpu_read(ksoftirqd) && + __this_cpu_read(ksoftirqd)->softirqs_raised) + wakeup_softirqd(); + if (__this_cpu_read(ktimer_softirqd) && + __this_cpu_read(ktimer_softirqd)->softirqs_raised) + wakeup_timer_softirqd(); + local_irq_restore(flags); +#endif } static inline void tick_irq_exit(void) @@ -381,7 +838,13 @@ static inline void tick_irq_exit(void) int cpu = smp_processor_id(); /* Make sure that timer wheel updates are propagated */ - if ((idle_cpu(cpu) && !need_resched()) || tick_nohz_full_cpu(cpu)) { +#ifdef CONFIG_PREEMPT_RT_BASE + if ((idle_cpu(cpu) || tick_nohz_full_cpu(cpu)) && + !need_resched() && !local_softirq_pending()) +#else + if ((idle_cpu(cpu) && !need_resched()) || tick_nohz_full_cpu(cpu)) +#endif + { if (!in_interrupt()) tick_nohz_irq_exit(); } @@ -409,26 +872,6 @@ void irq_exit(void) trace_hardirq_exit(); /* must be last! */ } -/* - * This function must run with irqs disabled! - */ -inline void raise_softirq_irqoff(unsigned int nr) -{ - __raise_softirq_irqoff(nr); - - /* - * If we're in an interrupt or softirq, we're done - * (this also catches softirq-disabled code). We will - * actually run the softirq once we return from - * the irq or softirq. - * - * Otherwise we wake up ksoftirqd to make sure we - * schedule the softirq soon. - */ - if (!in_interrupt()) - wakeup_softirqd(); -} - void raise_softirq(unsigned int nr) { unsigned long flags; @@ -438,12 +881,6 @@ void raise_softirq(unsigned int nr) local_irq_restore(flags); } -void __raise_softirq_irqoff(unsigned int nr) -{ - trace_softirq_raise(nr); - or_softirq_pending(1UL << nr); -} - void open_softirq(int nr, void (*action)(struct softirq_action *)) { softirq_vec[nr].action = action; @@ -460,15 +897,45 @@ struct tasklet_head { static DEFINE_PER_CPU(struct tasklet_head, tasklet_vec); static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec); +static void inline +__tasklet_common_schedule(struct tasklet_struct *t, struct tasklet_head *head, unsigned int nr) +{ + if (tasklet_trylock(t)) { +again: + /* We may have been preempted before tasklet_trylock + * and __tasklet_action may have already run. + * So double check the sched bit while the takslet + * is locked before adding it to the list. + */ + if (test_bit(TASKLET_STATE_SCHED, &t->state)) { + t->next = NULL; + *head->tail = t; + head->tail = &(t->next); + raise_softirq_irqoff(nr); + tasklet_unlock(t); + } else { + /* This is subtle. If we hit the corner case above + * It is possible that we get preempted right here, + * and another task has successfully called + * tasklet_schedule(), then this function, and + * failed on the trylock. Thus we must be sure + * before releasing the tasklet lock, that the + * SCHED_BIT is clear. Otherwise the tasklet + * may get its SCHED_BIT set, but not added to the + * list + */ + if (!tasklet_tryunlock(t)) + goto again; + } + } +} + void __tasklet_schedule(struct tasklet_struct *t) { unsigned long flags; local_irq_save(flags); - t->next = NULL; - *__this_cpu_read(tasklet_vec.tail) = t; - __this_cpu_write(tasklet_vec.tail, &(t->next)); - raise_softirq_irqoff(TASKLET_SOFTIRQ); + __tasklet_common_schedule(t, this_cpu_ptr(&tasklet_vec), TASKLET_SOFTIRQ); local_irq_restore(flags); } EXPORT_SYMBOL(__tasklet_schedule); @@ -478,50 +945,108 @@ void __tasklet_hi_schedule(struct taskle unsigned long flags; local_irq_save(flags); - t->next = NULL; - *__this_cpu_read(tasklet_hi_vec.tail) = t; - __this_cpu_write(tasklet_hi_vec.tail, &(t->next)); - raise_softirq_irqoff(HI_SOFTIRQ); + __tasklet_common_schedule(t, this_cpu_ptr(&tasklet_hi_vec), HI_SOFTIRQ); local_irq_restore(flags); } EXPORT_SYMBOL(__tasklet_hi_schedule); -static __latent_entropy void tasklet_action(struct softirq_action *a) +void tasklet_enable(struct tasklet_struct *t) { - struct tasklet_struct *list; + if (!atomic_dec_and_test(&t->count)) + return; + if (test_and_clear_bit(TASKLET_STATE_PENDING, &t->state)) + tasklet_schedule(t); +} +EXPORT_SYMBOL(tasklet_enable); - local_irq_disable(); - list = __this_cpu_read(tasklet_vec.head); - __this_cpu_write(tasklet_vec.head, NULL); - __this_cpu_write(tasklet_vec.tail, this_cpu_ptr(&tasklet_vec.head)); - local_irq_enable(); +static void __tasklet_action(struct softirq_action *a, + struct tasklet_struct *list) +{ + int loops = 1000000; while (list) { struct tasklet_struct *t = list; list = list->next; - if (tasklet_trylock(t)) { - if (!atomic_read(&t->count)) { - if (!test_and_clear_bit(TASKLET_STATE_SCHED, - &t->state)) - BUG(); - t->func(t->data); - tasklet_unlock(t); - continue; - } - tasklet_unlock(t); + /* + * Should always succeed - after a tasklist got on the + * list (after getting the SCHED bit set from 0 to 1), + * nothing but the tasklet softirq it got queued to can + * lock it: + */ + if (!tasklet_trylock(t)) { + WARN_ON(1); + continue; } - local_irq_disable(); t->next = NULL; - *__this_cpu_read(tasklet_vec.tail) = t; - __this_cpu_write(tasklet_vec.tail, &(t->next)); - __raise_softirq_irqoff(TASKLET_SOFTIRQ); - local_irq_enable(); + + /* + * If we cannot handle the tasklet because it's disabled, + * mark it as pending. tasklet_enable() will later + * re-schedule the tasklet. + */ + if (unlikely(atomic_read(&t->count))) { +out_disabled: + /* implicit unlock: */ + wmb(); + t->state = TASKLET_STATEF_PENDING; + continue; + } + + /* + * After this point on the tasklet might be rescheduled + * on another CPU, but it can only be added to another + * CPU's tasklet list if we unlock the tasklet (which we + * dont do yet). + */ + if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state)) + WARN_ON(1); + +again: + t->func(t->data); + + /* + * Try to unlock the tasklet. We must use cmpxchg, because + * another CPU might have scheduled or disabled the tasklet. + * We only allow the STATE_RUN -> 0 transition here. + */ + while (!tasklet_tryunlock(t)) { + /* + * If it got disabled meanwhile, bail out: + */ + if (atomic_read(&t->count)) + goto out_disabled; + /* + * If it got scheduled meanwhile, re-execute + * the tasklet function: + */ + if (test_and_clear_bit(TASKLET_STATE_SCHED, &t->state)) + goto again; + if (!--loops) { + printk("hm, tasklet state: %08lx\n", t->state); + WARN_ON(1); + tasklet_unlock(t); + break; + } + } } } +static __latent_entropy void tasklet_action(struct softirq_action *a) +{ + struct tasklet_struct *list; + + local_irq_disable(); + list = __this_cpu_read(tasklet_vec.head); + __this_cpu_write(tasklet_vec.head, NULL); + __this_cpu_write(tasklet_vec.tail, this_cpu_ptr(&tasklet_vec.head)); + local_irq_enable(); + + __tasklet_action(a, list); +} + static __latent_entropy void tasklet_hi_action(struct softirq_action *a) { struct tasklet_struct *list; @@ -532,30 +1057,7 @@ static __latent_entropy void tasklet_hi_ __this_cpu_write(tasklet_hi_vec.tail, this_cpu_ptr(&tasklet_hi_vec.head)); local_irq_enable(); - while (list) { - struct tasklet_struct *t = list; - - list = list->next; - - if (tasklet_trylock(t)) { - if (!atomic_read(&t->count)) { - if (!test_and_clear_bit(TASKLET_STATE_SCHED, - &t->state)) - BUG(); - t->func(t->data); - tasklet_unlock(t); - continue; - } - tasklet_unlock(t); - } - - local_irq_disable(); - t->next = NULL; - *__this_cpu_read(tasklet_hi_vec.tail) = t; - __this_cpu_write(tasklet_hi_vec.tail, &(t->next)); - __raise_softirq_irqoff(HI_SOFTIRQ); - local_irq_enable(); - } + __tasklet_action(a, list); } void tasklet_init(struct tasklet_struct *t, @@ -576,7 +1078,7 @@ void tasklet_kill(struct tasklet_struct while (test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) { do { - yield(); + msleep(1); } while (test_bit(TASKLET_STATE_SCHED, &t->state)); } tasklet_unlock_wait(t); @@ -584,57 +1086,6 @@ void tasklet_kill(struct tasklet_struct } EXPORT_SYMBOL(tasklet_kill); -/* - * tasklet_hrtimer - */ - -/* - * The trampoline is called when the hrtimer expires. It schedules a tasklet - * to run __tasklet_hrtimer_trampoline() which in turn will call the intended - * hrtimer callback, but from softirq context. - */ -static enum hrtimer_restart __hrtimer_tasklet_trampoline(struct hrtimer *timer) -{ - struct tasklet_hrtimer *ttimer = - container_of(timer, struct tasklet_hrtimer, timer); - - tasklet_hi_schedule(&ttimer->tasklet); - return HRTIMER_NORESTART; -} - -/* - * Helper function which calls the hrtimer callback from - * tasklet/softirq context - */ -static void __tasklet_hrtimer_trampoline(unsigned long data) -{ - struct tasklet_hrtimer *ttimer = (void *)data; - enum hrtimer_restart restart; - - restart = ttimer->function(&ttimer->timer); - if (restart != HRTIMER_NORESTART) - hrtimer_restart(&ttimer->timer); -} - -/** - * tasklet_hrtimer_init - Init a tasklet/hrtimer combo for softirq callbacks - * @ttimer: tasklet_hrtimer which is initialized - * @function: hrtimer callback function which gets called from softirq context - * @which_clock: clock id (CLOCK_MONOTONIC/CLOCK_REALTIME) - * @mode: hrtimer mode (HRTIMER_MODE_ABS/HRTIMER_MODE_REL) - */ -void tasklet_hrtimer_init(struct tasklet_hrtimer *ttimer, - enum hrtimer_restart (*function)(struct hrtimer *), - clockid_t which_clock, enum hrtimer_mode mode) -{ - hrtimer_init(&ttimer->timer, which_clock, mode); - ttimer->timer.function = __hrtimer_tasklet_trampoline; - tasklet_init(&ttimer->tasklet, __tasklet_hrtimer_trampoline, - (unsigned long)ttimer); - ttimer->function = function; -} -EXPORT_SYMBOL_GPL(tasklet_hrtimer_init); - void __init softirq_init(void) { int cpu; @@ -650,25 +1101,26 @@ void __init softirq_init(void) open_softirq(HI_SOFTIRQ, tasklet_hi_action); } -static int ksoftirqd_should_run(unsigned int cpu) -{ - return local_softirq_pending(); -} - -static void run_ksoftirqd(unsigned int cpu) +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL) +void tasklet_unlock_wait(struct tasklet_struct *t) { - local_irq_disable(); - if (local_softirq_pending()) { + while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { /* - * We can safely run softirq on inline stack, as we are not deep - * in the task stack here. + * Hack for now to avoid this busy-loop: */ - __do_softirq(); - local_irq_enable(); - cond_resched_rcu_qs(); - return; +#ifdef CONFIG_PREEMPT_RT_FULL + msleep(1); +#else + barrier(); +#endif } - local_irq_enable(); +} +EXPORT_SYMBOL(tasklet_unlock_wait); +#endif + +static int ksoftirqd_should_run(unsigned int cpu) +{ + return ksoftirqd_softirq_pending(); } #ifdef CONFIG_HOTPLUG_CPU @@ -735,17 +1187,31 @@ static int takeover_tasklets(unsigned in static struct smp_hotplug_thread softirq_threads = { .store = &ksoftirqd, + .setup = ksoftirqd_set_sched_params, .thread_should_run = ksoftirqd_should_run, .thread_fn = run_ksoftirqd, .thread_comm = "ksoftirqd/%u", }; +#ifdef CONFIG_PREEMPT_RT_FULL +static struct smp_hotplug_thread softirq_timer_threads = { + .store = &ktimer_softirqd, + .setup = ktimer_softirqd_set_sched_params, + .cleanup = ktimer_softirqd_clr_sched_params, + .thread_should_run = ktimer_softirqd_should_run, + .thread_fn = run_ksoftirqd, + .thread_comm = "ktimersoftd/%u", +}; +#endif + static __init int spawn_ksoftirqd(void) { cpuhp_setup_state_nocalls(CPUHP_SOFTIRQ_DEAD, "softirq:dead", NULL, takeover_tasklets); BUG_ON(smpboot_register_percpu_thread(&softirq_threads)); - +#ifdef CONFIG_PREEMPT_RT_FULL + BUG_ON(smpboot_register_percpu_thread(&softirq_timer_threads)); +#endif return 0; } early_initcall(spawn_ksoftirqd); Index: linux-4.14.15-rt12/kernel/stop_machine.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/stop_machine.c +++ linux-4.14.15-rt12/kernel/stop_machine.c @@ -36,7 +36,7 @@ struct cpu_stop_done { struct cpu_stopper { struct task_struct *thread; - spinlock_t lock; + raw_spinlock_t lock; bool enabled; /* is this stopper enabled? */ struct list_head works; /* list of pending works */ @@ -78,14 +78,14 @@ static bool cpu_stop_queue_work(unsigned unsigned long flags; bool enabled; - spin_lock_irqsave(&stopper->lock, flags); + raw_spin_lock_irqsave(&stopper->lock, flags); enabled = stopper->enabled; if (enabled) __cpu_stop_queue_work(stopper, work); else if (work->done) cpu_stop_signal_done(work->done); - spin_unlock_irqrestore(&stopper->lock, flags); + raw_spin_unlock_irqrestore(&stopper->lock, flags); return enabled; } @@ -231,8 +231,8 @@ static int cpu_stop_queue_two_works(int struct cpu_stopper *stopper2 = per_cpu_ptr(&cpu_stopper, cpu2); int err; retry: - spin_lock_irq(&stopper1->lock); - spin_lock_nested(&stopper2->lock, SINGLE_DEPTH_NESTING); + raw_spin_lock_irq(&stopper1->lock); + raw_spin_lock_nested(&stopper2->lock, SINGLE_DEPTH_NESTING); err = -ENOENT; if (!stopper1->enabled || !stopper2->enabled) @@ -255,8 +255,8 @@ retry: __cpu_stop_queue_work(stopper1, work1); __cpu_stop_queue_work(stopper2, work2); unlock: - spin_unlock(&stopper2->lock); - spin_unlock_irq(&stopper1->lock); + raw_spin_unlock(&stopper2->lock); + raw_spin_unlock_irq(&stopper1->lock); if (unlikely(err == -EDEADLK)) { while (stop_cpus_in_progress) @@ -448,9 +448,9 @@ static int cpu_stop_should_run(unsigned unsigned long flags; int run; - spin_lock_irqsave(&stopper->lock, flags); + raw_spin_lock_irqsave(&stopper->lock, flags); run = !list_empty(&stopper->works); - spin_unlock_irqrestore(&stopper->lock, flags); + raw_spin_unlock_irqrestore(&stopper->lock, flags); return run; } @@ -461,13 +461,13 @@ static void cpu_stopper_thread(unsigned repeat: work = NULL; - spin_lock_irq(&stopper->lock); + raw_spin_lock_irq(&stopper->lock); if (!list_empty(&stopper->works)) { work = list_first_entry(&stopper->works, struct cpu_stop_work, list); list_del_init(&work->list); } - spin_unlock_irq(&stopper->lock); + raw_spin_unlock_irq(&stopper->lock); if (work) { cpu_stop_fn_t fn = work->fn; @@ -475,6 +475,8 @@ repeat: struct cpu_stop_done *done = work->done; int ret; + /* XXX */ + /* cpu stop callbacks must not sleep, make in_atomic() == T */ preempt_count_inc(); ret = fn(arg); @@ -541,7 +543,7 @@ static int __init cpu_stop_init(void) for_each_possible_cpu(cpu) { struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu); - spin_lock_init(&stopper->lock); + raw_spin_lock_init(&stopper->lock); INIT_LIST_HEAD(&stopper->works); } Index: linux-4.14.15-rt12/kernel/time/hrtimer.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/hrtimer.c +++ linux-4.14.15-rt12/kernel/time/hrtimer.c @@ -60,6 +60,15 @@ #include "tick-internal.h" /* + * Masks for selecting the soft and hard context timers from + * cpu_base->active + */ +#define MASK_SHIFT (HRTIMER_BASE_MONOTONIC_SOFT) +#define HRTIMER_ACTIVE_HARD ((1U << MASK_SHIFT) - 1) +#define HRTIMER_ACTIVE_SOFT (HRTIMER_ACTIVE_HARD << MASK_SHIFT) +#define HRTIMER_ACTIVE_ALL (HRTIMER_ACTIVE_SOFT | HRTIMER_ACTIVE_HARD) + +/* * The timer bases: * * There are more clockids than hrtimer bases. Thus, we index @@ -70,7 +79,6 @@ DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) = { .lock = __RAW_SPIN_LOCK_UNLOCKED(hrtimer_bases.lock), - .seq = SEQCNT_ZERO(hrtimer_bases.seq), .clock_base = { { @@ -93,6 +101,26 @@ DEFINE_PER_CPU(struct hrtimer_cpu_base, .clockid = CLOCK_TAI, .get_time = &ktime_get_clocktai, }, + { + .index = HRTIMER_BASE_MONOTONIC_SOFT, + .clockid = CLOCK_MONOTONIC, + .get_time = &ktime_get, + }, + { + .index = HRTIMER_BASE_REALTIME_SOFT, + .clockid = CLOCK_REALTIME, + .get_time = &ktime_get_real, + }, + { + .index = HRTIMER_BASE_BOOTTIME_SOFT, + .clockid = CLOCK_BOOTTIME, + .get_time = &ktime_get_boottime, + }, + { + .index = HRTIMER_BASE_TAI_SOFT, + .clockid = CLOCK_TAI, + .get_time = &ktime_get_clocktai, + }, } }; @@ -118,7 +146,6 @@ static const int hrtimer_clock_to_base_t * timer->base->cpu_base */ static struct hrtimer_cpu_base migration_cpu_base = { - .seq = SEQCNT_ZERO(migration_cpu_base), .clock_base = { { .cpu_base = &migration_cpu_base, }, }, }; @@ -156,45 +183,33 @@ struct hrtimer_clock_base *lock_hrtimer_ } /* - * With HIGHRES=y we do not migrate the timer when it is expiring - * before the next event on the target cpu because we cannot reprogram - * the target cpu hardware and we would cause it to fire late. + * We do not migrate the timer when it is expiring before the next + * event on the target cpu. When high resolution is enabled, we cannot + * reprogram the target cpu hardware and we would cause it to fire + * late. To keep it simple, we handle the high resolution enabled and + * disabled case similar. * * Called with cpu_base->lock of target cpu held. */ static int hrtimer_check_target(struct hrtimer *timer, struct hrtimer_clock_base *new_base) { -#ifdef CONFIG_HIGH_RES_TIMERS ktime_t expires; - if (!new_base->cpu_base->hres_active) - return 0; - expires = ktime_sub(hrtimer_get_expires(timer), new_base->offset); - return expires <= new_base->cpu_base->expires_next; -#else - return 0; -#endif + return expires < new_base->cpu_base->expires_next; } -#ifdef CONFIG_NO_HZ_COMMON -static inline -struct hrtimer_cpu_base *get_target_base(struct hrtimer_cpu_base *base, - int pinned) -{ - if (pinned || !base->migration_enabled) - return base; - return &per_cpu(hrtimer_bases, get_nohz_timer_target()); -} -#else static inline struct hrtimer_cpu_base *get_target_base(struct hrtimer_cpu_base *base, int pinned) { +#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) + if (static_branch_unlikely(&timers_migration_enabled) && !pinned) + return &per_cpu(hrtimer_bases, get_nohz_timer_target()); +#endif return base; } -#endif /* * We switch the timer base to a power-optimized selected CPU target, @@ -396,7 +411,8 @@ static inline void debug_hrtimer_init(st debug_object_init(timer, &hrtimer_debug_descr); } -static inline void debug_hrtimer_activate(struct hrtimer *timer) +static inline void debug_hrtimer_activate(struct hrtimer *timer, + enum hrtimer_mode mode) { debug_object_activate(timer, &hrtimer_debug_descr); } @@ -429,8 +445,10 @@ void destroy_hrtimer_on_stack(struct hrt EXPORT_SYMBOL_GPL(destroy_hrtimer_on_stack); #else + static inline void debug_hrtimer_init(struct hrtimer *timer) { } -static inline void debug_hrtimer_activate(struct hrtimer *timer) { } +static inline void debug_hrtimer_activate(struct hrtimer *timer, + enum hrtimer_mode mode) { } static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { } #endif @@ -442,10 +460,11 @@ debug_init(struct hrtimer *timer, clocki trace_hrtimer_init(timer, clockid, mode); } -static inline void debug_activate(struct hrtimer *timer) +static inline void debug_activate(struct hrtimer *timer, + enum hrtimer_mode mode) { - debug_hrtimer_activate(timer); - trace_hrtimer_start(timer); + debug_hrtimer_activate(timer, mode); + trace_hrtimer_start(timer, mode); } static inline void debug_deactivate(struct hrtimer *timer) @@ -454,35 +473,43 @@ static inline void debug_deactivate(stru trace_hrtimer_cancel(timer); } -#if defined(CONFIG_NO_HZ_COMMON) || defined(CONFIG_HIGH_RES_TIMERS) -static inline void hrtimer_update_next_timer(struct hrtimer_cpu_base *cpu_base, - struct hrtimer *timer) +static struct hrtimer_clock_base * +__next_base(struct hrtimer_cpu_base *cpu_base, unsigned int *active) { -#ifdef CONFIG_HIGH_RES_TIMERS - cpu_base->next_timer = timer; -#endif + unsigned int idx; + + if (!*active) + return NULL; + + idx = __ffs(*active); + *active &= ~(1U << idx); + + return &cpu_base->clock_base[idx]; } -static ktime_t __hrtimer_get_next_event(struct hrtimer_cpu_base *cpu_base) +#define for_each_active_base(base, cpu_base, active) \ + while ((base = __next_base((cpu_base), &(active)))) + +static ktime_t __hrtimer_next_event_base(struct hrtimer_cpu_base *cpu_base, + unsigned int active, + ktime_t expires_next) { - struct hrtimer_clock_base *base = cpu_base->clock_base; - unsigned int active = cpu_base->active_bases; - ktime_t expires, expires_next = KTIME_MAX; + struct hrtimer_clock_base *base; + ktime_t expires; - hrtimer_update_next_timer(cpu_base, NULL); - for (; active; base++, active >>= 1) { + for_each_active_base(base, cpu_base, active) { struct timerqueue_node *next; struct hrtimer *timer; - if (!(active & 0x01)) - continue; - next = timerqueue_getnext(&base->active); timer = container_of(next, struct hrtimer, node); expires = ktime_sub(hrtimer_get_expires(timer), base->offset); if (expires < expires_next) { expires_next = expires; - hrtimer_update_next_timer(cpu_base, timer); + if (timer->is_soft) + cpu_base->softirq_next_timer = timer; + else + cpu_base->next_timer = timer; } } /* @@ -494,7 +521,47 @@ static ktime_t __hrtimer_get_next_event( expires_next = 0; return expires_next; } -#endif + +/* + * Recomputes cpu_base::*next_timer and returns the earliest expires_next but + * does not set cpu_base::*expires_next, that is done by hrtimer_reprogram. + * + * When a softirq is pending, we can ignore the HRTIMER_ACTIVE_SOFT bases, + * those timers will get run whenever the softirq gets handled, at the end of + * hrtimer_run_softirq(), hrtimer_update_softirq_timer() will re-add these bases. + * + * Therefore softirq values are those from the HRTIMER_ACTIVE_SOFT clock bases. + * The !softirq values are the minima across HRTIMER_ACTIVE_ALL, unless an actual + * softirq is pending, in which case they're the minima of HRTIMER_ACTIVE_HARD. + * + * @active_mask must be one of: + * - HRTIMER_ACTIVE_ALL, + * - HRTIMER_ACTIVE_SOFT, or + * - HRTIMER_ACTIVE_HARD. + */ +static ktime_t +__hrtimer_get_next_event(struct hrtimer_cpu_base *cpu_base, unsigned int active_mask) +{ + unsigned int active; + struct hrtimer *next_timer = NULL; + ktime_t expires_next = KTIME_MAX; + + if (!cpu_base->softirq_activated && (active_mask & HRTIMER_ACTIVE_SOFT)) { + active = cpu_base->active_bases & HRTIMER_ACTIVE_SOFT; + cpu_base->softirq_next_timer = NULL; + expires_next = __hrtimer_next_event_base(cpu_base, active, KTIME_MAX); + + next_timer = cpu_base->softirq_next_timer; + } + + if (active_mask & HRTIMER_ACTIVE_HARD) { + active = cpu_base->active_bases & HRTIMER_ACTIVE_HARD; + cpu_base->next_timer = next_timer; + expires_next = __hrtimer_next_event_base(cpu_base, active, expires_next); + } + + return expires_next; +} static inline ktime_t hrtimer_update_base(struct hrtimer_cpu_base *base) { @@ -502,36 +569,14 @@ static inline ktime_t hrtimer_update_bas ktime_t *offs_boot = &base->clock_base[HRTIMER_BASE_BOOTTIME].offset; ktime_t *offs_tai = &base->clock_base[HRTIMER_BASE_TAI].offset; - return ktime_get_update_offsets_now(&base->clock_was_set_seq, + ktime_t now = ktime_get_update_offsets_now(&base->clock_was_set_seq, offs_real, offs_boot, offs_tai); -} - -/* High resolution timer related functions */ -#ifdef CONFIG_HIGH_RES_TIMERS - -/* - * High resolution timer enabled ? - */ -static bool hrtimer_hres_enabled __read_mostly = true; -unsigned int hrtimer_resolution __read_mostly = LOW_RES_NSEC; -EXPORT_SYMBOL_GPL(hrtimer_resolution); - -/* - * Enable / Disable high resolution mode - */ -static int __init setup_hrtimer_hres(char *str) -{ - return (kstrtobool(str, &hrtimer_hres_enabled) == 0); -} -__setup("highres=", setup_hrtimer_hres); + base->clock_base[HRTIMER_BASE_REALTIME_SOFT].offset = *offs_real; + base->clock_base[HRTIMER_BASE_BOOTTIME_SOFT].offset = *offs_boot; + base->clock_base[HRTIMER_BASE_TAI_SOFT].offset = *offs_tai; -/* - * hrtimer_high_res_enabled - query, if the highres mode is enabled - */ -static inline int hrtimer_is_hres_enabled(void) -{ - return hrtimer_hres_enabled; + return now; } /* @@ -539,7 +584,8 @@ static inline int hrtimer_is_hres_enable */ static inline int __hrtimer_hres_active(struct hrtimer_cpu_base *cpu_base) { - return cpu_base->hres_active; + return IS_ENABLED(CONFIG_HIGH_RES_TIMERS) ? + cpu_base->hres_active : 0; } static inline int hrtimer_hres_active(void) @@ -557,10 +603,23 @@ hrtimer_force_reprogram(struct hrtimer_c { ktime_t expires_next; - if (!cpu_base->hres_active) - return; + /* + * Find the current next expiration time. + */ + expires_next = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_ALL); - expires_next = __hrtimer_get_next_event(cpu_base); + if (cpu_base->next_timer && cpu_base->next_timer->is_soft) { + /* + * When the softirq is activated, hrtimer has to be + * programmed with the first hard hrtimer because soft + * timer interrupt could occur too late. + */ + if (cpu_base->softirq_activated) + expires_next = __hrtimer_get_next_event(cpu_base, + HRTIMER_ACTIVE_HARD); + else + cpu_base->softirq_expires_next = expires_next; + } if (skip_equal && expires_next == cpu_base->expires_next) return; @@ -568,6 +627,9 @@ hrtimer_force_reprogram(struct hrtimer_c cpu_base->expires_next = expires_next; /* + * If hres is not active, hardware does not have to be + * reprogrammed yet. + * * If a hang was detected in the last timer interrupt then we * leave the hang delay active in the hardware. We want the * system to make progress. That also prevents the following @@ -581,83 +643,38 @@ hrtimer_force_reprogram(struct hrtimer_c * set. So we'd effectivly block all timers until the T2 event * fires. */ - if (cpu_base->hang_detected) + if (!__hrtimer_hres_active(cpu_base) || cpu_base->hang_detected) return; tick_program_event(cpu_base->expires_next, 1); } +/* High resolution timer related functions */ +#ifdef CONFIG_HIGH_RES_TIMERS + /* - * When a timer is enqueued and expires earlier than the already enqueued - * timers, we have to check, whether it expires earlier than the timer for - * which the clock event device was armed. - * - * Called with interrupts disabled and base->cpu_base.lock held + * High resolution timer enabled ? */ -static void hrtimer_reprogram(struct hrtimer *timer, - struct hrtimer_clock_base *base) -{ - struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases); - ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset); - - WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0); - - /* - * If the timer is not on the current cpu, we cannot reprogram - * the other cpus clock event device. - */ - if (base->cpu_base != cpu_base) - return; - - /* - * If the hrtimer interrupt is running, then it will - * reevaluate the clock bases and reprogram the clock event - * device. The callbacks are always executed in hard interrupt - * context so we don't need an extra check for a running - * callback. - */ - if (cpu_base->in_hrtirq) - return; - - /* - * CLOCK_REALTIME timer might be requested with an absolute - * expiry time which is less than base->offset. Set it to 0. - */ - if (expires < 0) - expires = 0; - - if (expires >= cpu_base->expires_next) - return; - - /* Update the pointer to the next expiring timer */ - cpu_base->next_timer = timer; - - /* - * If a hang was detected in the last timer interrupt then we - * do not schedule a timer which is earlier than the expiry - * which we enforced in the hang detection. We want the system - * to make progress. - */ - if (cpu_base->hang_detected) - return; +static bool hrtimer_hres_enabled __read_mostly = true; +unsigned int hrtimer_resolution __read_mostly = LOW_RES_NSEC; +EXPORT_SYMBOL_GPL(hrtimer_resolution); - /* - * Program the timer hardware. We enforce the expiry for - * events which are already in the past. - */ - cpu_base->expires_next = expires; - tick_program_event(expires, 1); +/* + * Enable / Disable high resolution mode + */ +static int __init setup_hrtimer_hres(char *str) +{ + return (kstrtobool(str, &hrtimer_hres_enabled) == 0); } +__setup("highres=", setup_hrtimer_hres); + /* - * Initialize the high resolution related parts of cpu_base + * hrtimer_high_res_enabled - query, if the highres mode is enabled */ -static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) +static inline int hrtimer_is_hres_enabled(void) { - base->expires_next = KTIME_MAX; - base->hang_detected = 0; - base->hres_active = 0; - base->next_timer = NULL; + return hrtimer_hres_enabled; } /* @@ -669,7 +686,7 @@ static void retrigger_next_event(void *a { struct hrtimer_cpu_base *base = this_cpu_ptr(&hrtimer_bases); - if (!base->hres_active) + if (!__hrtimer_hres_active(base)) return; raw_spin_lock(&base->lock); @@ -698,6 +715,29 @@ static void hrtimer_switch_to_hres(void) retrigger_next_event(NULL); } +#ifdef CONFIG_PREEMPT_RT_FULL + +static struct swork_event clock_set_delay_work; + +static void run_clock_set_delay(struct swork_event *event) +{ + clock_was_set(); +} + +void clock_was_set_delayed(void) +{ + swork_queue(&clock_set_delay_work); +} + +static __init int create_clock_set_delay_thread(void) +{ + WARN_ON(swork_get()); + INIT_SWORK(&clock_set_delay_work, run_clock_set_delay); + return 0; +} +early_initcall(create_clock_set_delay_thread); +#else /* PREEMPT_RT_FULL */ + static void clock_was_set_work(struct work_struct *work) { clock_was_set(); @@ -713,26 +753,106 @@ void clock_was_set_delayed(void) { schedule_work(&hrtimer_work); } +#endif #else -static inline int __hrtimer_hres_active(struct hrtimer_cpu_base *b) { return 0; } -static inline int hrtimer_hres_active(void) { return 0; } static inline int hrtimer_is_hres_enabled(void) { return 0; } static inline void hrtimer_switch_to_hres(void) { } -static inline void -hrtimer_force_reprogram(struct hrtimer_cpu_base *base, int skip_equal) { } -static inline int hrtimer_reprogram(struct hrtimer *timer, - struct hrtimer_clock_base *base) -{ - return 0; -} -static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { } static inline void retrigger_next_event(void *arg) { } #endif /* CONFIG_HIGH_RES_TIMERS */ /* + * When a timer is enqueued and expires earlier than the already enqueued + * timers, we have to check, whether it expires earlier than the timer for + * which the clock event device was armed. + * + * Called with interrupts disabled and base->cpu_base.lock held + */ +static void hrtimer_reprogram(struct hrtimer *timer, bool reprogram) +{ + struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases); + struct hrtimer_clock_base *base = timer->base; + ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset); + + WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0); + + /* + * CLOCK_REALTIME timer might be requested with an absolute + * expiry time which is less than base->offset. Set it to 0. + */ + if (expires < 0) + expires = 0; + + if (timer->is_soft) { + /* + * soft hrtimer could be started on a remote CPU. In this + * case softirq_expires_next needs to be updated on the + * remote CPU. The soft hrtimer will not expire before the + * first hard hrtimer on the remote CPU - + * hrtimer_check_target() prevents this case. + */ + struct hrtimer_cpu_base *timer_cpu_base = base->cpu_base; + + if (timer_cpu_base->softirq_activated) + return; + + if (!ktime_before(expires, timer_cpu_base->softirq_expires_next)) + return; + + timer_cpu_base->softirq_next_timer = timer; + timer_cpu_base->softirq_expires_next = expires; + + if (!ktime_before(expires, timer_cpu_base->expires_next) || + !reprogram) + return; + } + + /* + * If the timer is not on the current cpu, we cannot reprogram + * the other cpus clock event device. + */ + if (base->cpu_base != cpu_base) + return; + + /* + * If the hrtimer interrupt is running, then it will + * reevaluate the clock bases and reprogram the clock event + * device. The callbacks are always executed in hard interrupt + * context so we don't need an extra check for a running + * callback. + */ + if (cpu_base->in_hrtirq) + return; + + if (expires >= cpu_base->expires_next) + return; + + /* Update the pointer to the next expiring timer */ + cpu_base->next_timer = timer; + cpu_base->expires_next = expires; + + /* + * If hres is not active, hardware does not have to be + * programmed yet. + * + * If a hang was detected in the last timer interrupt then we + * do not schedule a timer which is earlier than the expiry + * which we enforced in the hang detection. We want the system + * to make progress. + */ + if (!__hrtimer_hres_active(cpu_base) || cpu_base->hang_detected) + return; + + /* + * Program the timer hardware. We enforce the expiry for + * events which are already in the past. + */ + tick_program_event(expires, 1); +} + +/* * Clock realtime was set * * Change the offset of the realtime clock vs. the monotonic @@ -830,6 +950,33 @@ u64 hrtimer_forward(struct hrtimer *time } EXPORT_SYMBOL_GPL(hrtimer_forward); +#ifdef CONFIG_PREEMPT_RT_BASE +# define wake_up_timer_waiters(b) wake_up(&(b)->wait) + +/** + * hrtimer_wait_for_timer - Wait for a running timer + * + * @timer: timer to wait for + * + * The function waits in case the timers callback function is + * currently executed on the waitqueue of the timer base. The + * waitqueue is woken up after the timer callback function has + * finished execution. + */ +void hrtimer_wait_for_timer(const struct hrtimer *timer) +{ + struct hrtimer_clock_base *base = timer->base; + + if (base && base->cpu_base && + base->index >= HRTIMER_BASE_MONOTONIC_SOFT) + wait_event(base->cpu_base->wait, + !(hrtimer_callback_running(timer))); +} + +#else +# define wake_up_timer_waiters(b) do { } while (0) +#endif + /* * enqueue_hrtimer - internal function to (re)start a timer * @@ -839,9 +986,10 @@ EXPORT_SYMBOL_GPL(hrtimer_forward); * Returns 1 when the new timer is the leftmost timer in the tree. */ static int enqueue_hrtimer(struct hrtimer *timer, - struct hrtimer_clock_base *base) + struct hrtimer_clock_base *base, + enum hrtimer_mode mode) { - debug_activate(timer); + debug_activate(timer, mode); base->cpu_base->active_bases |= 1 << base->index; @@ -874,7 +1022,6 @@ static void __remove_hrtimer(struct hrti if (!timerqueue_del(&base->active, &timer->node)) cpu_base->active_bases &= ~(1 << base->index); -#ifdef CONFIG_HIGH_RES_TIMERS /* * Note: If reprogram is false we do not update * cpu_base->next_timer. This happens when we remove the first @@ -885,7 +1032,6 @@ static void __remove_hrtimer(struct hrti */ if (reprogram && timer == cpu_base->next_timer) hrtimer_force_reprogram(cpu_base, 1); -#endif } /* @@ -934,22 +1080,36 @@ static inline ktime_t hrtimer_update_low return tim; } -/** - * hrtimer_start_range_ns - (re)start an hrtimer on the current CPU - * @timer: the timer to be added - * @tim: expiry time - * @delta_ns: "slack" range for the timer - * @mode: expiry mode: absolute (HRTIMER_MODE_ABS) or - * relative (HRTIMER_MODE_REL) - */ -void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, - u64 delta_ns, const enum hrtimer_mode mode) +static void +hrtimer_update_softirq_timer(struct hrtimer_cpu_base *cpu_base, bool reprogram) { - struct hrtimer_clock_base *base, *new_base; - unsigned long flags; - int leftmost; + ktime_t expires; - base = lock_hrtimer_base(timer, &flags); + /* + * Find the next SOFT expiration. + */ + expires = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_SOFT); + + /* + * reprogramming needs to be triggered, even if the next soft + * hrtimer expires at the same time than the next hard + * hrtimer. cpu_base->softirq_expires_next needs to be updated! + */ + if (expires == KTIME_MAX) + return; + + /* + * cpu_base->*next_timer is recomputed by __hrtimer_get_next_event() + * cpu_base->*expires_next is only set by hrtimer_reprogram() + */ + hrtimer_reprogram(cpu_base->softirq_next_timer, reprogram); +} + +static int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, + u64 delta_ns, const enum hrtimer_mode mode, + struct hrtimer_clock_base *base) +{ + struct hrtimer_clock_base *new_base; /* Remove an active timer from the queue: */ remove_hrtimer(timer, base, true); @@ -964,21 +1124,37 @@ void hrtimer_start_range_ns(struct hrtim /* Switch the timer base, if necessary: */ new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED); - leftmost = enqueue_hrtimer(timer, new_base); - if (!leftmost) - goto unlock; + return enqueue_hrtimer(timer, new_base, mode); +} + +/** + * hrtimer_start_range_ns - (re)start an hrtimer + * @timer: the timer to be added + * @tim: expiry time + * @delta_ns: "slack" range for the timer + * @mode: timer mode: absolute (HRTIMER_MODE_ABS) or + * relative (HRTIMER_MODE_REL), and pinned (HRTIMER_MODE_PINNED); + * softirq based mode is considered for debug purpose only! + */ +void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, + u64 delta_ns, const enum hrtimer_mode mode) +{ + struct hrtimer_clock_base *base; + unsigned long flags; + + /* + * Check whether the HRTIMER_MODE_SOFT bit and hrtimer.is_soft + * match. + */ +#ifndef CONFIG_PREEMPT_RT_BASE + WARN_ON_ONCE(!(mode & HRTIMER_MODE_SOFT) ^ !timer->is_soft); +#endif + + base = lock_hrtimer_base(timer, &flags); + + if (__hrtimer_start_range_ns(timer, tim, delta_ns, mode, base)) + hrtimer_reprogram(timer, true); - if (!hrtimer_is_hres_active(timer)) { - /* - * Kick to reschedule the next tick to handle the new timer - * on dynticks target. - */ - if (new_base->cpu_base->nohz_active) - wake_up_nohz_cpu(new_base->cpu_base->cpu); - } else { - hrtimer_reprogram(timer, new_base); - } -unlock: unlock_hrtimer_base(timer, &flags); } EXPORT_SYMBOL_GPL(hrtimer_start_range_ns); @@ -1035,7 +1211,7 @@ int hrtimer_cancel(struct hrtimer *timer if (ret >= 0) return ret; - cpu_relax(); + hrtimer_wait_for_timer(timer); } } EXPORT_SYMBOL_GPL(hrtimer_cancel); @@ -1076,7 +1252,7 @@ u64 hrtimer_get_next_event(void) raw_spin_lock_irqsave(&cpu_base->lock, flags); if (!__hrtimer_hres_active(cpu_base)) - expires = __hrtimer_get_next_event(cpu_base); + expires = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_ALL); raw_spin_unlock_irqrestore(&cpu_base->lock, flags); @@ -1099,8 +1275,16 @@ static inline int hrtimer_clockid_to_bas static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode) { - struct hrtimer_cpu_base *cpu_base; + bool softtimer; int base; + struct hrtimer_cpu_base *cpu_base; + + softtimer = !!(mode & HRTIMER_MODE_SOFT); +#ifdef CONFIG_PREEMPT_RT_FULL + if (!softtimer && !(mode & HRTIMER_MODE_HARD)) + softtimer = true; +#endif + base = softtimer ? HRTIMER_MAX_CLOCK_BASES / 2 : 0; memset(timer, 0, sizeof(struct hrtimer)); @@ -1114,7 +1298,8 @@ static void __hrtimer_init(struct hrtime if (clock_id == CLOCK_REALTIME && mode & HRTIMER_MODE_REL) clock_id = CLOCK_MONOTONIC; - base = hrtimer_clockid_to_base(clock_id); + base += hrtimer_clockid_to_base(clock_id); + timer->is_soft = softtimer; timer->base = &cpu_base->clock_base[base]; timerqueue_init(&timer->node); } @@ -1123,7 +1308,13 @@ static void __hrtimer_init(struct hrtime * hrtimer_init - initialize a timer to the given clock * @timer: the timer to be initialized * @clock_id: the clock to be used - * @mode: timer mode abs/rel + * @mode: The modes which are relevant for intitialization: + * HRTIMER_MODE_ABS, HRTIMER_MODE_REL, HRTIMER_MODE_ABS_SOFT, + * HRTIMER_MODE_REL_SOFT + * + * The PINNED variants of the above can be handed in, + * but the PINNED bit is ignored as pinning happens + * when the hrtimer is started */ void hrtimer_init(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode) @@ -1142,19 +1333,19 @@ EXPORT_SYMBOL_GPL(hrtimer_init); */ bool hrtimer_active(const struct hrtimer *timer) { - struct hrtimer_cpu_base *cpu_base; + struct hrtimer_clock_base *base; unsigned int seq; do { - cpu_base = READ_ONCE(timer->base->cpu_base); - seq = raw_read_seqcount_begin(&cpu_base->seq); + base = READ_ONCE(timer->base); + seq = raw_read_seqcount_begin(&base->seq); if (timer->state != HRTIMER_STATE_INACTIVE || - cpu_base->running == timer) + base->running == timer) return true; - } while (read_seqcount_retry(&cpu_base->seq, seq) || - cpu_base != READ_ONCE(timer->base->cpu_base)); + } while (read_seqcount_retry(&base->seq, seq) || + base != READ_ONCE(timer->base)); return false; } @@ -1180,7 +1371,8 @@ EXPORT_SYMBOL_GPL(hrtimer_active); static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base, struct hrtimer_clock_base *base, - struct hrtimer *timer, ktime_t *now) + struct hrtimer *timer, ktime_t *now, + unsigned long flags) { enum hrtimer_restart (*fn)(struct hrtimer *); int restart; @@ -1188,16 +1380,16 @@ static void __run_hrtimer(struct hrtimer lockdep_assert_held(&cpu_base->lock); debug_deactivate(timer); - cpu_base->running = timer; + base->running = timer; /* * Separate the ->running assignment from the ->state assignment. * * As with a regular write barrier, this ensures the read side in - * hrtimer_active() cannot observe cpu_base->running == NULL && + * hrtimer_active() cannot observe base->running == NULL && * timer->state == INACTIVE. */ - raw_write_seqcount_barrier(&cpu_base->seq); + raw_write_seqcount_barrier(&base->seq); __remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE, 0); fn = timer->function; @@ -1211,15 +1403,15 @@ static void __run_hrtimer(struct hrtimer timer->is_rel = false; /* - * Because we run timers from hardirq context, there is no chance - * they get migrated to another cpu, therefore its safe to unlock - * the timer base. + * The timer is marked as running in the cpu base, so it is + * protected against migration to a different CPU even if the lock + * is dropped. */ - raw_spin_unlock(&cpu_base->lock); + raw_spin_unlock_irqrestore(&cpu_base->lock, flags); trace_hrtimer_expire_entry(timer, now); restart = fn(timer); trace_hrtimer_expire_exit(timer); - raw_spin_lock(&cpu_base->lock); + raw_spin_lock_irq(&cpu_base->lock); /* * Note: We clear the running state after enqueue_hrtimer and @@ -1232,33 +1424,31 @@ static void __run_hrtimer(struct hrtimer */ if (restart != HRTIMER_NORESTART && !(timer->state & HRTIMER_STATE_ENQUEUED)) - enqueue_hrtimer(timer, base); + enqueue_hrtimer(timer, base, HRTIMER_MODE_ABS); /* * Separate the ->running assignment from the ->state assignment. * * As with a regular write barrier, this ensures the read side in - * hrtimer_active() cannot observe cpu_base->running == NULL && + * hrtimer_active() cannot observe base->running.timer == NULL && * timer->state == INACTIVE. */ - raw_write_seqcount_barrier(&cpu_base->seq); + raw_write_seqcount_barrier(&base->seq); - WARN_ON_ONCE(cpu_base->running != timer); - cpu_base->running = NULL; + WARN_ON_ONCE(base->running != timer); + base->running = NULL; } -static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now) +static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now, + unsigned long flags, unsigned int active_mask) { - struct hrtimer_clock_base *base = cpu_base->clock_base; - unsigned int active = cpu_base->active_bases; + struct hrtimer_clock_base *base; + unsigned int active = cpu_base->active_bases & active_mask; - for (; active; base++, active >>= 1) { + for_each_active_base(base, cpu_base, active) { struct timerqueue_node *node; ktime_t basenow; - if (!(active & 0x01)) - continue; - basenow = ktime_add(now, base->offset); while ((node = timerqueue_getnext(&base->active))) { @@ -1281,11 +1471,29 @@ static void __hrtimer_run_queues(struct if (basenow < hrtimer_get_softexpires_tv64(timer)) break; - __run_hrtimer(cpu_base, base, timer, &basenow); + __run_hrtimer(cpu_base, base, timer, &basenow, flags); } } } +static __latent_entropy void hrtimer_run_softirq(struct softirq_action *h) +{ + struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases); + unsigned long flags; + ktime_t now; + + raw_spin_lock_irqsave(&cpu_base->lock, flags); + + now = hrtimer_update_base(cpu_base); + __hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_SOFT); + + cpu_base->softirq_activated = 0; + hrtimer_update_softirq_timer(cpu_base, true); + + raw_spin_unlock_irqrestore(&cpu_base->lock, flags); + wake_up_timer_waiters(cpu_base); +} + #ifdef CONFIG_HIGH_RES_TIMERS /* @@ -1296,13 +1504,14 @@ void hrtimer_interrupt(struct clock_even { struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases); ktime_t expires_next, now, entry_time, delta; + unsigned long flags; int retries = 0; BUG_ON(!cpu_base->hres_active); cpu_base->nr_events++; dev->next_event = KTIME_MAX; - raw_spin_lock(&cpu_base->lock); + raw_spin_lock_irqsave(&cpu_base->lock, flags); entry_time = now = hrtimer_update_base(cpu_base); retry: cpu_base->in_hrtirq = 1; @@ -1315,17 +1524,23 @@ retry: */ cpu_base->expires_next = KTIME_MAX; - __hrtimer_run_queues(cpu_base, now); + if (!ktime_before(now, cpu_base->softirq_expires_next)) { + cpu_base->softirq_expires_next = KTIME_MAX; + cpu_base->softirq_activated = 1; + raise_softirq_irqoff(HRTIMER_SOFTIRQ); + } + + __hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_HARD); /* Reevaluate the clock bases for the next expiry */ - expires_next = __hrtimer_get_next_event(cpu_base); + expires_next = __hrtimer_get_next_event(cpu_base, HRTIMER_ACTIVE_ALL); /* * Store the new expiry value so the migration code can verify * against it. */ cpu_base->expires_next = expires_next; cpu_base->in_hrtirq = 0; - raw_spin_unlock(&cpu_base->lock); + raw_spin_unlock_irqrestore(&cpu_base->lock, flags); /* Reprogramming necessary ? */ if (!tick_program_event(expires_next, 0)) { @@ -1346,7 +1561,7 @@ retry: * Acquire base lock for updating the offsets and retrieving * the current time. */ - raw_spin_lock(&cpu_base->lock); + raw_spin_lock_irqsave(&cpu_base->lock, flags); now = hrtimer_update_base(cpu_base); cpu_base->nr_retries++; if (++retries < 3) @@ -1359,7 +1574,8 @@ retry: */ cpu_base->nr_hangs++; cpu_base->hang_detected = 1; - raw_spin_unlock(&cpu_base->lock); + raw_spin_unlock_irqrestore(&cpu_base->lock, flags); + delta = ktime_sub(now, entry_time); if ((unsigned int)delta > cpu_base->max_hang_time) cpu_base->max_hang_time = (unsigned int) delta; @@ -1401,6 +1617,7 @@ static inline void __hrtimer_peek_ahead_ void hrtimer_run_queues(void) { struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases); + unsigned long flags; ktime_t now; if (__hrtimer_hres_active(cpu_base)) @@ -1418,10 +1635,17 @@ void hrtimer_run_queues(void) return; } - raw_spin_lock(&cpu_base->lock); + raw_spin_lock_irqsave(&cpu_base->lock, flags); now = hrtimer_update_base(cpu_base); - __hrtimer_run_queues(cpu_base, now); - raw_spin_unlock(&cpu_base->lock); + + if (!ktime_before(now, cpu_base->softirq_expires_next)) { + cpu_base->softirq_expires_next = KTIME_MAX; + cpu_base->softirq_activated = 1; + raise_softirq_irqoff(HRTIMER_SOFTIRQ); + } + + __hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_HARD); + raw_spin_unlock_irqrestore(&cpu_base->lock, flags); } /* @@ -1440,13 +1664,65 @@ static enum hrtimer_restart hrtimer_wake return HRTIMER_NORESTART; } -void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task) +#ifdef CONFIG_PREEMPT_RT_FULL +static bool task_is_realtime(struct task_struct *tsk) { + int policy = tsk->policy; + + if (policy == SCHED_FIFO || policy == SCHED_RR) + return true; + if (policy == SCHED_DEADLINE) + return true; + return false; +} +#endif + +static void __hrtimer_init_sleeper(struct hrtimer_sleeper *sl, + clockid_t clock_id, + enum hrtimer_mode mode, + struct task_struct *task) +{ +#ifdef CONFIG_PREEMPT_RT_FULL + if (!(mode & (HRTIMER_MODE_SOFT | HRTIMER_MODE_HARD))) { + if (task_is_realtime(current) || system_state != SYSTEM_RUNNING) + mode |= HRTIMER_MODE_HARD; + else + mode |= HRTIMER_MODE_SOFT; + } +#endif + __hrtimer_init(&sl->timer, clock_id, mode); sl->timer.function = hrtimer_wakeup; sl->task = task; } + +/** + * hrtimer_init_sleeper - initialize sleeper to the given clock + * @sl: sleeper to be initialized + * @clock_id: the clock to be used + * @mode: timer mode abs/rel + * @task: the task to wake up + */ +void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, clockid_t clock_id, + enum hrtimer_mode mode, struct task_struct *task) +{ + debug_init(&sl->timer, clock_id, mode); + __hrtimer_init_sleeper(sl, clock_id, mode, task); + +} EXPORT_SYMBOL_GPL(hrtimer_init_sleeper); +#ifdef CONFIG_DEBUG_OBJECTS_TIMERS +void hrtimer_init_sleeper_on_stack(struct hrtimer_sleeper *sl, + clockid_t clock_id, + enum hrtimer_mode mode, + struct task_struct *task) +{ + debug_object_init_on_stack(&sl->timer, &hrtimer_debug_descr); + __hrtimer_init_sleeper(sl, clock_id, mode, task); +} +EXPORT_SYMBOL_GPL(hrtimer_init_sleeper_on_stack); +#endif + int nanosleep_copyout(struct restart_block *restart, struct timespec64 *ts) { switch(restart->nanosleep.type) { @@ -1470,8 +1746,6 @@ static int __sched do_nanosleep(struct h { struct restart_block *restart; - hrtimer_init_sleeper(t, current); - do { set_current_state(TASK_INTERRUPTIBLE); hrtimer_start_expires(&t->timer, mode); @@ -1508,10 +1782,9 @@ static long __sched hrtimer_nanosleep_re struct hrtimer_sleeper t; int ret; - hrtimer_init_on_stack(&t.timer, restart->nanosleep.clockid, - HRTIMER_MODE_ABS); + hrtimer_init_sleeper_on_stack(&t, restart->nanosleep.clockid, + HRTIMER_MODE_ABS, current); hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires); - ret = do_nanosleep(&t, HRTIMER_MODE_ABS); destroy_hrtimer_on_stack(&t.timer); return ret; @@ -1529,7 +1802,7 @@ long hrtimer_nanosleep(const struct time if (dl_task(current) || rt_task(current)) slack = 0; - hrtimer_init_on_stack(&t.timer, clockid, mode); + hrtimer_init_sleeper_on_stack(&t, clockid, mode, current); hrtimer_set_expires_range_ns(&t.timer, timespec64_to_ktime(*rqtp), slack); ret = do_nanosleep(&t, mode); if (ret != -ERESTART_RESTARTBLOCK) @@ -1585,6 +1858,25 @@ COMPAT_SYSCALL_DEFINE2(nanosleep, struct } #endif +#ifdef CONFIG_PREEMPT_RT_FULL +/* + * Sleep for 1 ms in hope whoever holds what we want will let it go. + */ +void cpu_chill(void) +{ + ktime_t chill_time; + unsigned int freeze_flag = current->flags & PF_NOFREEZE; + + chill_time = ktime_set(0, NSEC_PER_MSEC); + set_current_state(TASK_UNINTERRUPTIBLE); + current->flags |= PF_NOFREEZE; + schedule_hrtimeout(&chill_time, HRTIMER_MODE_REL_HARD); + if (!freeze_flag) + current->flags &= ~PF_NOFREEZE; +} +EXPORT_SYMBOL(cpu_chill); +#endif + /* * Functions related to boot-time initialization: */ @@ -1598,9 +1890,17 @@ int hrtimers_prepare_cpu(unsigned int cp timerqueue_init_head(&cpu_base->clock_base[i].active); } - cpu_base->active_bases = 0; cpu_base->cpu = cpu; - hrtimer_init_hres(cpu_base); + cpu_base->active_bases = 0; + cpu_base->hres_active = 0; + cpu_base->hang_detected = 0; + cpu_base->next_timer = NULL; + cpu_base->softirq_next_timer = NULL; + cpu_base->expires_next = KTIME_MAX; + cpu_base->softirq_expires_next = KTIME_MAX; +#ifdef CONFIG_PREEMPT_RT_BASE + init_waitqueue_head(&cpu_base->wait); +#endif return 0; } @@ -1632,7 +1932,7 @@ static void migrate_hrtimer_list(struct * sort out already expired timers and reprogram the * event device. */ - enqueue_hrtimer(timer, new_base); + enqueue_hrtimer(timer, new_base, HRTIMER_MODE_ABS); } } @@ -1644,6 +1944,12 @@ int hrtimers_dead_cpu(unsigned int scpu) BUG_ON(cpu_online(scpu)); tick_cancel_sched_timer(scpu); + /* + * this BH disable ensures that raise_softirq_irqoff() does + * not wakeup ksoftirqd (and acquire the pi-lock) while + * holding the cpu_base lock + */ + local_bh_disable(); local_irq_disable(); old_base = &per_cpu(hrtimer_bases, scpu); new_base = this_cpu_ptr(&hrtimer_bases); @@ -1659,12 +1965,19 @@ int hrtimers_dead_cpu(unsigned int scpu) &new_base->clock_base[i]); } + /* + * The migration might have changed the first expiring softirq + * timer on this CPU. Update it. + */ + hrtimer_update_softirq_timer(new_base, false); + raw_spin_unlock(&old_base->lock); raw_spin_unlock(&new_base->lock); /* Check, if we got expired work to do */ __hrtimer_peek_ahead_timers(); local_irq_enable(); + local_bh_enable(); return 0; } @@ -1673,18 +1986,19 @@ int hrtimers_dead_cpu(unsigned int scpu) void __init hrtimers_init(void) { hrtimers_prepare_cpu(smp_processor_id()); + open_softirq(HRTIMER_SOFTIRQ, hrtimer_run_softirq); } /** * schedule_hrtimeout_range_clock - sleep until timeout * @expires: timeout value (ktime_t) * @delta: slack in expires timeout (ktime_t) - * @mode: timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL - * @clock: timer clock, CLOCK_MONOTONIC or CLOCK_REALTIME + * @mode: timer mode + * @clock_id: timer clock to be used */ int __sched schedule_hrtimeout_range_clock(ktime_t *expires, u64 delta, - const enum hrtimer_mode mode, int clock) + const enum hrtimer_mode mode, clockid_t clock_id) { struct hrtimer_sleeper t; @@ -1705,11 +2019,9 @@ schedule_hrtimeout_range_clock(ktime_t * return -EINTR; } - hrtimer_init_on_stack(&t.timer, clock, mode); + hrtimer_init_sleeper_on_stack(&t, clock_id, mode, current); hrtimer_set_expires_range_ns(&t.timer, *expires, delta); - hrtimer_init_sleeper(&t, current); - hrtimer_start_expires(&t.timer, mode); if (likely(t.task)) @@ -1727,7 +2039,7 @@ schedule_hrtimeout_range_clock(ktime_t * * schedule_hrtimeout_range - sleep until timeout * @expires: timeout value (ktime_t) * @delta: slack in expires timeout (ktime_t) - * @mode: timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL + * @mode: timer mode * * Make the current task sleep until the given expiry time has * elapsed. The routine will return immediately unless @@ -1766,7 +2078,7 @@ EXPORT_SYMBOL_GPL(schedule_hrtimeout_ran /** * schedule_hrtimeout - sleep until timeout * @expires: timeout value (ktime_t) - * @mode: timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL + * @mode: timer mode * * Make the current task sleep until the given expiry time has * elapsed. The routine will return immediately unless Index: linux-4.14.15-rt12/kernel/time/itimer.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/itimer.c +++ linux-4.14.15-rt12/kernel/time/itimer.c @@ -214,6 +214,7 @@ again: /* We are sharing ->siglock with it_real_fn() */ if (hrtimer_try_to_cancel(timer) < 0) { spin_unlock_irq(&tsk->sighand->siglock); + hrtimer_wait_for_timer(&tsk->signal->real_timer); goto again; } expires = timeval_to_ktime(value->it_value); Index: linux-4.14.15-rt12/kernel/time/jiffies.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/jiffies.c +++ linux-4.14.15-rt12/kernel/time/jiffies.c @@ -74,7 +74,8 @@ static struct clocksource clocksource_ji .max_cycles = 10, }; -__cacheline_aligned_in_smp DEFINE_SEQLOCK(jiffies_lock); +__cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(jiffies_lock); +__cacheline_aligned_in_smp seqcount_t jiffies_seq; #if (BITS_PER_LONG < 64) u64 get_jiffies_64(void) @@ -83,9 +84,9 @@ u64 get_jiffies_64(void) u64 ret; do { - seq = read_seqbegin(&jiffies_lock); + seq = read_seqcount_begin(&jiffies_seq); ret = jiffies_64; - } while (read_seqretry(&jiffies_lock, seq)); + } while (read_seqcount_retry(&jiffies_seq, seq)); return ret; } EXPORT_SYMBOL(get_jiffies_64); Index: linux-4.14.15-rt12/kernel/time/posix-cpu-timers.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/posix-cpu-timers.c +++ linux-4.14.15-rt12/kernel/time/posix-cpu-timers.c @@ -3,8 +3,10 @@ * Implement CPU time clocks for the POSIX clock interface. */ +#include #include #include +#include #include #include #include @@ -14,6 +16,7 @@ #include #include #include +#include #include "posix-timers.h" @@ -603,7 +606,7 @@ static int posix_cpu_timer_set(struct k_ /* * Disarm any old timer after extracting its expiry time. */ - WARN_ON_ONCE(!irqs_disabled()); + WARN_ON_ONCE_NONRT(!irqs_disabled()); ret = 0; old_incr = timer->it.cpu.incr; @@ -1034,7 +1037,7 @@ static void posix_cpu_timer_rearm(struct /* * Now re-arm for the new expiry time. */ - WARN_ON_ONCE(!irqs_disabled()); + WARN_ON_ONCE_NONRT(!irqs_disabled()); arm_timer(timer); unlock: unlock_task_sighand(p, &flags); @@ -1119,13 +1122,13 @@ static inline int fastpath_timer_check(s * already updated our counts. We need to check if any timers fire now. * Interrupts are disabled. */ -void run_posix_cpu_timers(struct task_struct *tsk) +static void __run_posix_cpu_timers(struct task_struct *tsk) { LIST_HEAD(firing); struct k_itimer *timer, *next; unsigned long flags; - WARN_ON_ONCE(!irqs_disabled()); + WARN_ON_ONCE_NONRT(!irqs_disabled()); /* * The fast path checks that there are no expired thread or thread @@ -1179,6 +1182,152 @@ void run_posix_cpu_timers(struct task_st } } +#ifdef CONFIG_PREEMPT_RT_BASE +#include +#include +DEFINE_PER_CPU(struct task_struct *, posix_timer_task); +DEFINE_PER_CPU(struct task_struct *, posix_timer_tasklist); +DEFINE_PER_CPU(bool, posix_timer_th_active); + +static void posix_cpu_kthread_fn(unsigned int cpu) +{ + struct task_struct *tsk = NULL; + struct task_struct *next = NULL; + + BUG_ON(per_cpu(posix_timer_task, cpu) != current); + + /* grab task list */ + raw_local_irq_disable(); + tsk = per_cpu(posix_timer_tasklist, cpu); + per_cpu(posix_timer_tasklist, cpu) = NULL; + raw_local_irq_enable(); + + /* its possible the list is empty, just return */ + if (!tsk) + return; + + /* Process task list */ + while (1) { + /* save next */ + next = tsk->posix_timer_list; + + /* run the task timers, clear its ptr and + * unreference it + */ + __run_posix_cpu_timers(tsk); + tsk->posix_timer_list = NULL; + put_task_struct(tsk); + + /* check if this is the last on the list */ + if (next == tsk) + break; + tsk = next; + } +} + +static inline int __fastpath_timer_check(struct task_struct *tsk) +{ + /* tsk == current, ensure it is safe to use ->signal/sighand */ + if (unlikely(tsk->exit_state)) + return 0; + + if (!task_cputime_zero(&tsk->cputime_expires)) + return 1; + + if (!task_cputime_zero(&tsk->signal->cputime_expires)) + return 1; + + return 0; +} + +void run_posix_cpu_timers(struct task_struct *tsk) +{ + unsigned int cpu = smp_processor_id(); + struct task_struct *tasklist; + + BUG_ON(!irqs_disabled()); + + if (per_cpu(posix_timer_th_active, cpu) != true) + return; + + /* get per-cpu references */ + tasklist = per_cpu(posix_timer_tasklist, cpu); + + /* check to see if we're already queued */ + if (!tsk->posix_timer_list && __fastpath_timer_check(tsk)) { + get_task_struct(tsk); + if (tasklist) { + tsk->posix_timer_list = tasklist; + } else { + /* + * The list is terminated by a self-pointing + * task_struct + */ + tsk->posix_timer_list = tsk; + } + per_cpu(posix_timer_tasklist, cpu) = tsk; + + wake_up_process(per_cpu(posix_timer_task, cpu)); + } +} + +static int posix_cpu_kthread_should_run(unsigned int cpu) +{ + return __this_cpu_read(posix_timer_tasklist) != NULL; +} + +static void posix_cpu_kthread_park(unsigned int cpu) +{ + this_cpu_write(posix_timer_th_active, false); +} + +static void posix_cpu_kthread_unpark(unsigned int cpu) +{ + this_cpu_write(posix_timer_th_active, true); +} + +static void posix_cpu_kthread_setup(unsigned int cpu) +{ + struct sched_param sp; + + sp.sched_priority = MAX_RT_PRIO - 1; + sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); + posix_cpu_kthread_unpark(cpu); +} + +static struct smp_hotplug_thread posix_cpu_thread = { + .store = &posix_timer_task, + .thread_should_run = posix_cpu_kthread_should_run, + .thread_fn = posix_cpu_kthread_fn, + .thread_comm = "posixcputmr/%u", + .setup = posix_cpu_kthread_setup, + .park = posix_cpu_kthread_park, + .unpark = posix_cpu_kthread_unpark, +}; + +static int __init posix_cpu_thread_init(void) +{ + /* Start one for boot CPU. */ + unsigned long cpu; + int ret; + + /* init the per-cpu posix_timer_tasklets */ + for_each_possible_cpu(cpu) + per_cpu(posix_timer_tasklist, cpu) = NULL; + + ret = smpboot_register_percpu_thread(&posix_cpu_thread); + WARN_ON(ret); + + return 0; +} +early_initcall(posix_cpu_thread_init); +#else /* CONFIG_PREEMPT_RT_BASE */ +void run_posix_cpu_timers(struct task_struct *tsk) +{ + __run_posix_cpu_timers(tsk); +} +#endif /* CONFIG_PREEMPT_RT_BASE */ + /* * Set one of the process-wide special case CPU timers or RLIMIT_CPU. * The tsk->sighand->siglock must be held by the caller. Index: linux-4.14.15-rt12/kernel/time/posix-timers.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/posix-timers.c +++ linux-4.14.15-rt12/kernel/time/posix-timers.c @@ -433,6 +433,7 @@ static enum hrtimer_restart posix_timer_ static struct pid *good_sigevent(sigevent_t * event) { struct task_struct *rtn = current->group_leader; + int sig = event->sigev_signo; switch (event->sigev_notify) { case SIGEV_SIGNAL | SIGEV_THREAD_ID: @@ -442,7 +443,8 @@ static struct pid *good_sigevent(sigeven /* FALLTHRU */ case SIGEV_SIGNAL: case SIGEV_THREAD: - if (event->sigev_signo <= 0 || event->sigev_signo > SIGRTMAX) + if (sig <= 0 || sig > SIGRTMAX || + sig_kernel_only(sig) || sig_kernel_coredump(sig)) return NULL; /* FALLTHRU */ case SIGEV_NONE: @@ -794,6 +796,20 @@ SYSCALL_DEFINE1(timer_getoverrun, timer_ return overrun; } +/* + * Protected by RCU! + */ +static void timer_wait_for_callback(const struct k_clock *kc, struct k_itimer *timr) +{ +#ifdef CONFIG_PREEMPT_RT_FULL + if (kc->timer_set == common_timer_set) + hrtimer_wait_for_timer(&timr->it.real.timer); + else + /* FIXME: Whacky hack for posix-cpu-timers */ + schedule_timeout(1); +#endif +} + static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires, bool absolute, bool sigev_none) { @@ -888,6 +904,7 @@ retry: if (!timr) return -EINVAL; + rcu_read_lock(); kc = timr->kclock; if (WARN_ON_ONCE(!kc || !kc->timer_set)) error = -EINVAL; @@ -896,9 +913,12 @@ retry: unlock_timer(timr, flag); if (error == TIMER_RETRY) { + timer_wait_for_callback(kc, timr); old_spec64 = NULL; // We already got the old time... + rcu_read_unlock(); goto retry; } + rcu_read_unlock(); return error; } @@ -980,10 +1000,15 @@ retry_delete: if (!timer) return -EINVAL; + rcu_read_lock(); if (timer_delete_hook(timer) == TIMER_RETRY) { unlock_timer(timer, flags); + timer_wait_for_callback(clockid_to_kclock(timer->it_clock), + timer); + rcu_read_unlock(); goto retry_delete; } + rcu_read_unlock(); spin_lock(¤t->sighand->siglock); list_del(&timer->list); @@ -1009,8 +1034,18 @@ static void itimer_delete(struct k_itime retry_delete: spin_lock_irqsave(&timer->it_lock, flags); + /* On RT we can race with a deletion */ + if (!timer->it_signal) { + unlock_timer(timer, flags); + return; + } + if (timer_delete_hook(timer) == TIMER_RETRY) { + rcu_read_lock(); unlock_timer(timer, flags); + timer_wait_for_callback(clockid_to_kclock(timer->it_clock), + timer); + rcu_read_unlock(); goto retry_delete; } list_del(&timer->list); Index: linux-4.14.15-rt12/kernel/time/tick-broadcast-hrtimer.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/tick-broadcast-hrtimer.c +++ linux-4.14.15-rt12/kernel/time/tick-broadcast-hrtimer.c @@ -106,7 +106,7 @@ static enum hrtimer_restart bc_handler(s void tick_setup_hrtimer_broadcast(void) { - hrtimer_init(&bctimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + hrtimer_init(&bctimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD); bctimer.function = bc_handler; clockevents_register_device(&ce_broadcast_hrtimer); } Index: linux-4.14.15-rt12/kernel/time/tick-common.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/tick-common.c +++ linux-4.14.15-rt12/kernel/time/tick-common.c @@ -79,13 +79,15 @@ int tick_is_oneshot_available(void) static void tick_periodic(int cpu) { if (tick_do_timer_cpu == cpu) { - write_seqlock(&jiffies_lock); + raw_spin_lock(&jiffies_lock); + write_seqcount_begin(&jiffies_seq); /* Keep track of the next tick event */ tick_next_period = ktime_add(tick_next_period, tick_period); do_timer(1); - write_sequnlock(&jiffies_lock); + write_seqcount_end(&jiffies_seq); + raw_spin_unlock(&jiffies_lock); update_wall_time(); } @@ -157,9 +159,9 @@ void tick_setup_periodic(struct clock_ev ktime_t next; do { - seq = read_seqbegin(&jiffies_lock); + seq = read_seqcount_begin(&jiffies_seq); next = tick_next_period; - } while (read_seqretry(&jiffies_lock, seq)); + } while (read_seqcount_retry(&jiffies_seq, seq)); clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT); Index: linux-4.14.15-rt12/kernel/time/tick-internal.h =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/tick-internal.h +++ linux-4.14.15-rt12/kernel/time/tick-internal.h @@ -150,16 +150,15 @@ static inline void tick_nohz_init(void) #ifdef CONFIG_NO_HZ_COMMON extern unsigned long tick_nohz_active; -#else +extern void timers_update_nohz(void); +# ifdef CONFIG_SMP +extern struct static_key_false timers_migration_enabled; +# endif +#else /* CONFIG_NO_HZ_COMMON */ +static inline void timers_update_nohz(void) { } #define tick_nohz_active (0) #endif -#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) -extern void timers_update_migration(bool update_nohz); -#else -static inline void timers_update_migration(bool update_nohz) { } -#endif - DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases); extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem); Index: linux-4.14.15-rt12/kernel/time/tick-sched.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/tick-sched.c +++ linux-4.14.15-rt12/kernel/time/tick-sched.c @@ -66,7 +66,8 @@ static void tick_do_update_jiffies64(kti return; /* Reevaluate with jiffies_lock held */ - write_seqlock(&jiffies_lock); + raw_spin_lock(&jiffies_lock); + write_seqcount_begin(&jiffies_seq); delta = ktime_sub(now, last_jiffies_update); if (delta >= tick_period) { @@ -89,10 +90,12 @@ static void tick_do_update_jiffies64(kti /* Keep the tick_next_period variable up to date */ tick_next_period = ktime_add(last_jiffies_update, tick_period); } else { - write_sequnlock(&jiffies_lock); + write_seqcount_end(&jiffies_seq); + raw_spin_unlock(&jiffies_lock); return; } - write_sequnlock(&jiffies_lock); + write_seqcount_end(&jiffies_seq); + raw_spin_unlock(&jiffies_lock); update_wall_time(); } @@ -103,12 +106,14 @@ static ktime_t tick_init_jiffy_update(vo { ktime_t period; - write_seqlock(&jiffies_lock); + raw_spin_lock(&jiffies_lock); + write_seqcount_begin(&jiffies_seq); /* Did we start the jiffies update yet ? */ if (last_jiffies_update == 0) last_jiffies_update = tick_next_period; period = last_jiffies_update; - write_sequnlock(&jiffies_lock); + write_seqcount_end(&jiffies_seq); + raw_spin_unlock(&jiffies_lock); return period; } @@ -225,6 +230,7 @@ static void nohz_full_kick_func(struct i static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = { .func = nohz_full_kick_func, + .flags = IRQ_WORK_HARD_IRQ, }; /* @@ -689,10 +695,10 @@ static ktime_t tick_nohz_stop_sched_tick /* Read jiffies and the time when jiffies were updated last */ do { - seq = read_seqbegin(&jiffies_lock); + seq = read_seqcount_begin(&jiffies_seq); basemono = last_jiffies_update; basejiff = jiffies; - } while (read_seqretry(&jiffies_lock, seq)); + } while (read_seqcount_retry(&jiffies_seq, seq)); ts->last_jiffies = basejiff; /* @@ -905,14 +911,7 @@ static bool can_stop_idle_tick(int cpu, return false; if (unlikely(local_softirq_pending() && cpu_online(cpu))) { - static int ratelimit; - - if (ratelimit < 10 && - (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) { - pr_warn("NOHZ: local_softirq_pending %02x\n", - (unsigned int) local_softirq_pending()); - ratelimit++; - } + softirq_check_pending_idle(); return false; } @@ -1131,7 +1130,7 @@ static inline void tick_nohz_activate(st ts->nohz_mode = mode; /* One update is enough */ if (!test_and_set_bit(0, &tick_nohz_active)) - timers_update_migration(true); + timers_update_nohz(); } /** @@ -1249,7 +1248,7 @@ void tick_setup_sched_timer(void) /* * Emulate tick processing via per-CPU hrtimers: */ - hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD); ts->sched_timer.function = tick_sched_timer; /* Get the next period (per-CPU) */ Index: linux-4.14.15-rt12/kernel/time/timekeeping.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/timekeeping.c +++ linux-4.14.15-rt12/kernel/time/timekeeping.c @@ -2326,8 +2326,10 @@ EXPORT_SYMBOL(hardpps); */ void xtime_update(unsigned long ticks) { - write_seqlock(&jiffies_lock); + raw_spin_lock(&jiffies_lock); + write_seqcount_begin(&jiffies_seq); do_timer(ticks); - write_sequnlock(&jiffies_lock); + write_seqcount_end(&jiffies_seq); + raw_spin_unlock(&jiffies_lock); update_wall_time(); } Index: linux-4.14.15-rt12/kernel/time/timekeeping.h =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/timekeeping.h +++ linux-4.14.15-rt12/kernel/time/timekeeping.h @@ -18,7 +18,8 @@ extern void timekeeping_resume(void); extern void do_timer(unsigned long ticks); extern void update_wall_time(void); -extern seqlock_t jiffies_lock; +extern raw_spinlock_t jiffies_lock; +extern seqcount_t jiffies_seq; #define CS_NAME_LEN 32 Index: linux-4.14.15-rt12/kernel/time/timer.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/time/timer.c +++ linux-4.14.15-rt12/kernel/time/timer.c @@ -44,6 +44,7 @@ #include #include #include +#include #include #include @@ -197,11 +198,12 @@ EXPORT_SYMBOL(jiffies_64); struct timer_base { raw_spinlock_t lock; struct timer_list *running_timer; +#ifdef CONFIG_PREEMPT_RT_FULL + struct swait_queue_head wait_for_running_timer; +#endif unsigned long clk; unsigned long next_expiry; unsigned int cpu; - bool migration_enabled; - bool nohz_active; bool is_idle; bool must_forward_clk; DECLARE_BITMAP(pending_map, WHEEL_SIZE); @@ -210,45 +212,73 @@ struct timer_base { static DEFINE_PER_CPU(struct timer_base, timer_bases[NR_BASES]); -#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) +#ifdef CONFIG_NO_HZ_COMMON + +static DEFINE_STATIC_KEY_FALSE(timers_nohz_active); +static DEFINE_MUTEX(timer_keys_mutex); + +static struct swork_event timer_update_swork; + +#ifdef CONFIG_SMP unsigned int sysctl_timer_migration = 1; -void timers_update_migration(bool update_nohz) +DEFINE_STATIC_KEY_FALSE(timers_migration_enabled); + +static void timers_update_migration(void) { bool on = sysctl_timer_migration && tick_nohz_active; - unsigned int cpu; - /* Avoid the loop, if nothing to update */ - if (this_cpu_read(timer_bases[BASE_STD].migration_enabled) == on) - return; + if (on) + static_branch_enable(&timers_migration_enabled); + else + static_branch_disable(&timers_migration_enabled); +} +#else +static inline void timers_update_migration(void) { } +#endif /* !CONFIG_SMP */ - for_each_possible_cpu(cpu) { - per_cpu(timer_bases[BASE_STD].migration_enabled, cpu) = on; - per_cpu(timer_bases[BASE_DEF].migration_enabled, cpu) = on; - per_cpu(hrtimer_bases.migration_enabled, cpu) = on; - if (!update_nohz) - continue; - per_cpu(timer_bases[BASE_STD].nohz_active, cpu) = true; - per_cpu(timer_bases[BASE_DEF].nohz_active, cpu) = true; - per_cpu(hrtimer_bases.nohz_active, cpu) = true; - } +static void timer_update_keys(struct swork_event *event) +{ + mutex_lock(&timer_keys_mutex); + timers_update_migration(); + static_branch_enable(&timers_nohz_active); + mutex_unlock(&timer_keys_mutex); } +void timers_update_nohz(void) +{ + swork_queue(&timer_update_swork); +} + +static __init int hrtimer_init_thread(void) +{ + WARN_ON(swork_get()); + INIT_SWORK(&timer_update_swork, timer_update_keys); + return 0; +} +early_initcall(hrtimer_init_thread); + int timer_migration_handler(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { - static DEFINE_MUTEX(mutex); int ret; - mutex_lock(&mutex); + mutex_lock(&timer_keys_mutex); ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); if (!ret && write) - timers_update_migration(false); - mutex_unlock(&mutex); + timers_update_migration(); + mutex_unlock(&timer_keys_mutex); return ret; } -#endif + +static inline bool is_timers_nohz_active(void) +{ + return static_branch_unlikely(&timers_nohz_active); +} +#else +static inline bool is_timers_nohz_active(void) { return false; } +#endif /* NO_HZ_COMMON */ static unsigned long round_jiffies_common(unsigned long j, int cpu, bool force_up) @@ -534,7 +564,7 @@ __internal_add_timer(struct timer_base * static void trigger_dyntick_cpu(struct timer_base *base, struct timer_list *timer) { - if (!IS_ENABLED(CONFIG_NO_HZ_COMMON) || !base->nohz_active) + if (!is_timers_nohz_active()) return; /* @@ -840,21 +870,20 @@ static inline struct timer_base *get_tim return get_timer_cpu_base(tflags, tflags & TIMER_CPUMASK); } -#ifdef CONFIG_NO_HZ_COMMON static inline struct timer_base * get_target_base(struct timer_base *base, unsigned tflags) { -#ifdef CONFIG_SMP - if ((tflags & TIMER_PINNED) || !base->migration_enabled) - return get_timer_this_cpu_base(tflags); - return get_timer_cpu_base(tflags, get_nohz_timer_target()); -#else - return get_timer_this_cpu_base(tflags); +#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) + if (static_branch_unlikely(&timers_migration_enabled) && + !(tflags & TIMER_PINNED)) + return get_timer_cpu_base(tflags, get_nohz_timer_target()); #endif + return get_timer_this_cpu_base(tflags); } static inline void forward_timer_base(struct timer_base *base) { +#ifdef CONFIG_NO_HZ_COMMON unsigned long jnow; /* @@ -878,16 +907,8 @@ static inline void forward_timer_base(st base->clk = jnow; else base->clk = base->next_expiry; -} -#else -static inline struct timer_base * -get_target_base(struct timer_base *base, unsigned tflags) -{ - return get_timer_this_cpu_base(tflags); -} - -static inline void forward_timer_base(struct timer_base *base) { } #endif +} /* @@ -1130,6 +1151,33 @@ void add_timer_on(struct timer_list *tim } EXPORT_SYMBOL_GPL(add_timer_on); +#ifdef CONFIG_PREEMPT_RT_FULL +/* + * Wait for a running timer + */ +static void wait_for_running_timer(struct timer_list *timer) +{ + struct timer_base *base; + u32 tf = timer->flags; + + if (tf & TIMER_MIGRATING) + return; + + base = get_timer_base(tf); + swait_event(base->wait_for_running_timer, + base->running_timer != timer); +} + +# define wakeup_timer_waiters(b) swake_up_all(&(b)->wait_for_running_timer) +#else +static inline void wait_for_running_timer(struct timer_list *timer) +{ + cpu_relax(); +} + +# define wakeup_timer_waiters(b) do { } while (0) +#endif + /** * del_timer - deactivate a timer. * @timer: the timer to be deactivated @@ -1185,7 +1233,7 @@ int try_to_del_timer_sync(struct timer_l } EXPORT_SYMBOL(try_to_del_timer_sync); -#ifdef CONFIG_SMP +#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL) /** * del_timer_sync - deactivate a timer and wait for the handler to finish. * @timer: the timer to be deactivated @@ -1245,7 +1293,7 @@ int del_timer_sync(struct timer_list *ti int ret = try_to_del_timer_sync(timer); if (ret >= 0) return ret; - cpu_relax(); + wait_for_running_timer(timer); } } EXPORT_SYMBOL(del_timer_sync); @@ -1309,13 +1357,16 @@ static void expire_timers(struct timer_b fn = timer->function; data = timer->data; - if (timer->flags & TIMER_IRQSAFE) { + if (!IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && + timer->flags & TIMER_IRQSAFE) { raw_spin_unlock(&base->lock); call_timer_fn(timer, fn, data); + base->running_timer = NULL; raw_spin_lock(&base->lock); } else { raw_spin_unlock_irq(&base->lock); call_timer_fn(timer, fn, data); + base->running_timer = NULL; raw_spin_lock_irq(&base->lock); } } @@ -1584,13 +1635,13 @@ void update_process_times(int user_tick) /* Note: this timer irq context must be accounted for as well. */ account_process_tick(p, user_tick); + scheduler_tick(); run_local_timers(); rcu_check_callbacks(user_tick); -#ifdef CONFIG_IRQ_WORK +#if defined(CONFIG_IRQ_WORK) if (in_irq()) irq_work_tick(); #endif - scheduler_tick(); if (IS_ENABLED(CONFIG_POSIX_TIMERS)) run_posix_cpu_timers(p); } @@ -1617,8 +1668,8 @@ static inline void __run_timers(struct t while (levels--) expire_timers(base, heads + levels); } - base->running_timer = NULL; raw_spin_unlock_irq(&base->lock); + wakeup_timer_waiters(base); } /* @@ -1628,6 +1679,7 @@ static __latent_entropy void run_timer_s { struct timer_base *base = this_cpu_ptr(&timer_bases[BASE_STD]); + irq_work_tick_soft(); /* * must_forward_clk must be cleared before running timers so that any * timer functions that call mod_timer will not try to forward the @@ -1864,6 +1916,9 @@ static void __init init_timer_cpu(int cp base->cpu = cpu; raw_spin_lock_init(&base->lock); base->clk = jiffies; +#ifdef CONFIG_PREEMPT_RT_FULL + init_swait_queue_head(&base->wait_for_running_timer); +#endif } } Index: linux-4.14.15-rt12/kernel/trace/Kconfig =================================================================== --- linux-4.14.15-rt12.orig/kernel/trace/Kconfig +++ linux-4.14.15-rt12/kernel/trace/Kconfig @@ -585,7 +585,10 @@ config HIST_TRIGGERS event activity as an initial guide for further investigation using more advanced tools. - See Documentation/trace/events.txt. + Inter-event tracing of quantities such as latencies is also + supported using hist triggers under this option. + + See Documentation/trace/histogram.txt. If in doubt, say N. config MMIOTRACE_TEST Index: linux-4.14.15-rt12/kernel/trace/ring_buffer.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/trace/ring_buffer.c +++ linux-4.14.15-rt12/kernel/trace/ring_buffer.c @@ -41,6 +41,8 @@ int ring_buffer_print_entry_header(struc RINGBUF_TYPE_PADDING); trace_seq_printf(s, "\ttime_extend : type == %d\n", RINGBUF_TYPE_TIME_EXTEND); + trace_seq_printf(s, "\ttime_stamp : type == %d\n", + RINGBUF_TYPE_TIME_STAMP); trace_seq_printf(s, "\tdata max type_len == %d\n", RINGBUF_TYPE_DATA_TYPE_LEN_MAX); @@ -140,12 +142,15 @@ int ring_buffer_print_entry_header(struc enum { RB_LEN_TIME_EXTEND = 8, - RB_LEN_TIME_STAMP = 16, + RB_LEN_TIME_STAMP = 8, }; #define skip_time_extend(event) \ ((struct ring_buffer_event *)((char *)event + RB_LEN_TIME_EXTEND)) +#define extended_time(event) \ + (event->type_len >= RINGBUF_TYPE_TIME_EXTEND) + static inline int rb_null_event(struct ring_buffer_event *event) { return event->type_len == RINGBUF_TYPE_PADDING && !event->time_delta; @@ -209,7 +214,7 @@ rb_event_ts_length(struct ring_buffer_ev { unsigned len = 0; - if (event->type_len == RINGBUF_TYPE_TIME_EXTEND) { + if (extended_time(event)) { /* time extends include the data event after it */ len = RB_LEN_TIME_EXTEND; event = skip_time_extend(event); @@ -231,7 +236,7 @@ unsigned ring_buffer_event_length(struct { unsigned length; - if (event->type_len == RINGBUF_TYPE_TIME_EXTEND) + if (extended_time(event)) event = skip_time_extend(event); length = rb_event_length(event); @@ -248,7 +253,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_event_leng static __always_inline void * rb_event_data(struct ring_buffer_event *event) { - if (event->type_len == RINGBUF_TYPE_TIME_EXTEND) + if (extended_time(event)) event = skip_time_extend(event); BUG_ON(event->type_len > RINGBUF_TYPE_DATA_TYPE_LEN_MAX); /* If length is in len field, then array[0] has the data */ @@ -275,6 +280,27 @@ EXPORT_SYMBOL_GPL(ring_buffer_event_data #define TS_MASK ((1ULL << TS_SHIFT) - 1) #define TS_DELTA_TEST (~TS_MASK) +/** + * ring_buffer_event_time_stamp - return the event's extended timestamp + * @event: the event to get the timestamp of + * + * Returns the extended timestamp associated with a data event. + * An extended time_stamp is a 64-bit timestamp represented + * internally in a special way that makes the best use of space + * contained within a ring buffer event. This function decodes + * it and maps it to a straight u64 value. + */ +u64 ring_buffer_event_time_stamp(struct ring_buffer_event *event) +{ + u64 ts; + + ts = event->array[0]; + ts <<= TS_SHIFT; + ts += event->time_delta; + + return ts; +} + /* Flag when events were overwritten */ #define RB_MISSED_EVENTS (1 << 31) /* Missed count stored at end */ @@ -451,6 +477,7 @@ struct ring_buffer_per_cpu { struct buffer_page *reader_page; unsigned long lost_events; unsigned long last_overrun; + unsigned long nest; local_t entries_bytes; local_t entries; local_t overrun; @@ -488,6 +515,7 @@ struct ring_buffer { u64 (*clock)(void); struct rb_irq_work irq_work; + bool time_stamp_abs; }; struct ring_buffer_iter { @@ -1382,6 +1410,16 @@ void ring_buffer_set_clock(struct ring_b buffer->clock = clock; } +void ring_buffer_set_time_stamp_abs(struct ring_buffer *buffer, bool abs) +{ + buffer->time_stamp_abs = abs; +} + +bool ring_buffer_time_stamp_abs(struct ring_buffer *buffer) +{ + return buffer->time_stamp_abs; +} + static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer); static inline unsigned long rb_page_entries(struct buffer_page *bpage) @@ -2212,12 +2250,15 @@ rb_move_tail(struct ring_buffer_per_cpu /* Slow path, do not inline */ static noinline struct ring_buffer_event * -rb_add_time_stamp(struct ring_buffer_event *event, u64 delta) +rb_add_time_stamp(struct ring_buffer_event *event, u64 delta, bool abs) { - event->type_len = RINGBUF_TYPE_TIME_EXTEND; + if (abs) + event->type_len = RINGBUF_TYPE_TIME_STAMP; + else + event->type_len = RINGBUF_TYPE_TIME_EXTEND; - /* Not the first event on the page? */ - if (rb_event_index(event)) { + /* Not the first event on the page, or not delta? */ + if (abs || rb_event_index(event)) { event->time_delta = delta & TS_MASK; event->array[0] = delta >> TS_SHIFT; } else { @@ -2260,7 +2301,9 @@ rb_update_event(struct ring_buffer_per_c * add it to the start of the resevered space. */ if (unlikely(info->add_timestamp)) { - event = rb_add_time_stamp(event, delta); + bool abs = ring_buffer_time_stamp_abs(cpu_buffer->buffer); + + event = rb_add_time_stamp(event, info->delta, abs); length -= RB_LEN_TIME_EXTEND; delta = 0; } @@ -2448,7 +2491,7 @@ static __always_inline void rb_end_commi static inline void rb_event_discard(struct ring_buffer_event *event) { - if (event->type_len == RINGBUF_TYPE_TIME_EXTEND) + if (extended_time(event)) event = skip_time_extend(event); /* array[0] holds the actual length for the discarded event */ @@ -2492,10 +2535,11 @@ rb_update_write_stamp(struct ring_buffer cpu_buffer->write_stamp = cpu_buffer->commit_page->page->time_stamp; else if (event->type_len == RINGBUF_TYPE_TIME_EXTEND) { - delta = event->array[0]; - delta <<= TS_SHIFT; - delta += event->time_delta; + delta = ring_buffer_event_time_stamp(event); cpu_buffer->write_stamp += delta; + } else if (event->type_len == RINGBUF_TYPE_TIME_STAMP) { + delta = ring_buffer_event_time_stamp(event); + cpu_buffer->write_stamp = delta; } else cpu_buffer->write_stamp += event->time_delta; } @@ -2578,22 +2622,19 @@ static __always_inline int trace_recursive_lock(struct ring_buffer_per_cpu *cpu_buffer) { unsigned int val = cpu_buffer->current_context; + unsigned long pc = preempt_count(); int bit; - if (in_interrupt()) { - if (in_nmi()) - bit = RB_CTX_NMI; - else if (in_irq()) - bit = RB_CTX_IRQ; - else - bit = RB_CTX_SOFTIRQ; - } else + if (!(pc & (NMI_MASK | HARDIRQ_MASK | SOFTIRQ_OFFSET))) bit = RB_CTX_NORMAL; + else + bit = pc & NMI_MASK ? RB_CTX_NMI : + pc & HARDIRQ_MASK ? RB_CTX_IRQ : RB_CTX_SOFTIRQ; - if (unlikely(val & (1 << bit))) + if (unlikely(val & (1 << (bit + cpu_buffer->nest)))) return 1; - val |= (1 << bit); + val |= (1 << (bit + cpu_buffer->nest)); cpu_buffer->current_context = val; return 0; @@ -2602,7 +2643,57 @@ trace_recursive_lock(struct ring_buffer_ static __always_inline void trace_recursive_unlock(struct ring_buffer_per_cpu *cpu_buffer) { - cpu_buffer->current_context &= cpu_buffer->current_context - 1; + cpu_buffer->current_context &= + cpu_buffer->current_context - (1 << cpu_buffer->nest); +} + +/* The recursive locking above uses 4 bits */ +#define NESTED_BITS 4 + +/** + * ring_buffer_nest_start - Allow to trace while nested + * @buffer: The ring buffer to modify + * + * The ring buffer has a safty mechanism to prevent recursion. + * But there may be a case where a trace needs to be done while + * tracing something else. In this case, calling this function + * will allow this function to nest within a currently active + * ring_buffer_lock_reserve(). + * + * Call this function before calling another ring_buffer_lock_reserve() and + * call ring_buffer_nest_end() after the nested ring_buffer_unlock_commit(). + */ +void ring_buffer_nest_start(struct ring_buffer *buffer) +{ + struct ring_buffer_per_cpu *cpu_buffer; + int cpu; + + /* Enabled by ring_buffer_nest_end() */ + preempt_disable_notrace(); + cpu = raw_smp_processor_id(); + cpu_buffer = buffer->buffers[cpu]; + /* This is the shift value for the above recusive locking */ + cpu_buffer->nest += NESTED_BITS; +} + +/** + * ring_buffer_nest_end - Allow to trace while nested + * @buffer: The ring buffer to modify + * + * Must be called after ring_buffer_nest_start() and after the + * ring_buffer_unlock_commit(). + */ +void ring_buffer_nest_end(struct ring_buffer *buffer) +{ + struct ring_buffer_per_cpu *cpu_buffer; + int cpu; + + /* disabled by ring_buffer_nest_start() */ + cpu = raw_smp_processor_id(); + cpu_buffer = buffer->buffers[cpu]; + /* This is the shift value for the above recusive locking */ + cpu_buffer->nest -= NESTED_BITS; + preempt_enable_notrace(); } /** @@ -2678,7 +2769,7 @@ __rb_reserve_next(struct ring_buffer_per * If this is the first commit on the page, then it has the same * timestamp as the page itself. */ - if (!tail) + if (!tail && !ring_buffer_time_stamp_abs(cpu_buffer->buffer)) info->delta = 0; /* See if we shot pass the end of this buffer page */ @@ -2755,8 +2846,11 @@ rb_reserve_next_event(struct ring_buffer /* make sure this diff is calculated here */ barrier(); - /* Did the write stamp get updated already? */ - if (likely(info.ts >= cpu_buffer->write_stamp)) { + if (ring_buffer_time_stamp_abs(buffer)) { + info.delta = info.ts; + rb_handle_timestamp(cpu_buffer, &info); + } else /* Did the write stamp get updated already? */ + if (likely(info.ts >= cpu_buffer->write_stamp)) { info.delta = diff; if (unlikely(test_time_stamp(info.delta))) rb_handle_timestamp(cpu_buffer, &info); @@ -3438,14 +3532,13 @@ rb_update_read_stamp(struct ring_buffer_ return; case RINGBUF_TYPE_TIME_EXTEND: - delta = event->array[0]; - delta <<= TS_SHIFT; - delta += event->time_delta; + delta = ring_buffer_event_time_stamp(event); cpu_buffer->read_stamp += delta; return; case RINGBUF_TYPE_TIME_STAMP: - /* FIXME: not implemented */ + delta = ring_buffer_event_time_stamp(event); + cpu_buffer->read_stamp = delta; return; case RINGBUF_TYPE_DATA: @@ -3469,14 +3562,13 @@ rb_update_iter_read_stamp(struct ring_bu return; case RINGBUF_TYPE_TIME_EXTEND: - delta = event->array[0]; - delta <<= TS_SHIFT; - delta += event->time_delta; + delta = ring_buffer_event_time_stamp(event); iter->read_stamp += delta; return; case RINGBUF_TYPE_TIME_STAMP: - /* FIXME: not implemented */ + delta = ring_buffer_event_time_stamp(event); + iter->read_stamp = delta; return; case RINGBUF_TYPE_DATA: @@ -3700,6 +3792,8 @@ rb_buffer_peek(struct ring_buffer_per_cp struct buffer_page *reader; int nr_loops = 0; + if (ts) + *ts = 0; again: /* * We repeat when a time extend is encountered. @@ -3736,12 +3830,17 @@ rb_buffer_peek(struct ring_buffer_per_cp goto again; case RINGBUF_TYPE_TIME_STAMP: - /* FIXME: not implemented */ + if (ts) { + *ts = ring_buffer_event_time_stamp(event); + ring_buffer_normalize_time_stamp(cpu_buffer->buffer, + cpu_buffer->cpu, ts); + } + /* Internal data, OK to advance */ rb_advance_reader(cpu_buffer); goto again; case RINGBUF_TYPE_DATA: - if (ts) { + if (ts && !(*ts)) { *ts = cpu_buffer->read_stamp + event->time_delta; ring_buffer_normalize_time_stamp(cpu_buffer->buffer, cpu_buffer->cpu, ts); @@ -3766,6 +3865,9 @@ rb_iter_peek(struct ring_buffer_iter *it struct ring_buffer_event *event; int nr_loops = 0; + if (ts) + *ts = 0; + cpu_buffer = iter->cpu_buffer; buffer = cpu_buffer->buffer; @@ -3818,12 +3920,17 @@ rb_iter_peek(struct ring_buffer_iter *it goto again; case RINGBUF_TYPE_TIME_STAMP: - /* FIXME: not implemented */ + if (ts) { + *ts = ring_buffer_event_time_stamp(event); + ring_buffer_normalize_time_stamp(cpu_buffer->buffer, + cpu_buffer->cpu, ts); + } + /* Internal data, OK to advance */ rb_advance_iter(iter); goto again; case RINGBUF_TYPE_DATA: - if (ts) { + if (ts && !(*ts)) { *ts = iter->read_stamp + event->time_delta; ring_buffer_normalize_time_stamp(buffer, cpu_buffer->cpu, ts); Index: linux-4.14.15-rt12/kernel/trace/trace.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/trace/trace.c +++ linux-4.14.15-rt12/kernel/trace/trace.c @@ -1170,6 +1170,14 @@ static struct { ARCH_TRACE_CLOCKS }; +bool trace_clock_in_ns(struct trace_array *tr) +{ + if (trace_clocks[tr->clock_id].in_ns) + return true; + + return false; +} + /* * trace_parser_get_init - gets the buffer for trace parser */ @@ -2121,6 +2129,7 @@ tracing_generic_entry_update(struct trac struct task_struct *tsk = current; entry->preempt_count = pc & 0xff; + entry->preempt_lazy_count = preempt_lazy_count(); entry->pid = (tsk) ? tsk->pid : 0; entry->flags = #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT @@ -2131,8 +2140,11 @@ tracing_generic_entry_update(struct trac ((pc & NMI_MASK ) ? TRACE_FLAG_NMI : 0) | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | ((pc & SOFTIRQ_OFFSET) ? TRACE_FLAG_SOFTIRQ : 0) | - (tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) | + (tif_need_resched_now() ? TRACE_FLAG_NEED_RESCHED : 0) | + (need_resched_lazy() ? TRACE_FLAG_NEED_RESCHED_LAZY : 0) | (test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0); + + entry->migrate_disable = (tsk) ? __migrate_disabled(tsk) & 0xFF : 0; } EXPORT_SYMBOL_GPL(tracing_generic_entry_update); @@ -2269,7 +2281,7 @@ trace_event_buffer_lock_reserve(struct r *current_rb = trace_file->tr->trace_buffer.buffer; - if ((trace_file->flags & + if (!ring_buffer_time_stamp_abs(*current_rb) && (trace_file->flags & (EVENT_FILE_FL_SOFT_DISABLED | EVENT_FILE_FL_FILTERED)) && (entry = this_cpu_read(trace_buffered_event))) { /* Try to use the per cpu buffer first */ @@ -3331,14 +3343,17 @@ get_total_entries(struct trace_buffer *b static void print_lat_help_header(struct seq_file *m) { - seq_puts(m, "# _------=> CPU# \n" - "# / _-----=> irqs-off \n" - "# | / _----=> need-resched \n" - "# || / _---=> hardirq/softirq \n" - "# ||| / _--=> preempt-depth \n" - "# |||| / delay \n" - "# cmd pid ||||| time | caller \n" - "# \\ / ||||| \\ | / \n"); + seq_puts(m, "# _--------=> CPU# \n" + "# / _-------=> irqs-off \n" + "# | / _------=> need-resched \n" + "# || / _-----=> need-resched_lazy \n" + "# ||| / _----=> hardirq/softirq \n" + "# |||| / _---=> preempt-depth \n" + "# ||||| / _--=> preempt-lazy-depth\n" + "# |||||| / _-=> migrate-disable \n" + "# ||||||| / delay \n" + "# cmd pid |||||||| time | caller \n" + "# \\ / |||||||| \\ | / \n"); } static void print_event_info(struct trace_buffer *buf, struct seq_file *m) @@ -3374,15 +3389,17 @@ static void print_func_help_header_irq(s tgid ? tgid_space : space); seq_printf(m, "# %s / _----=> need-resched\n", tgid ? tgid_space : space); - seq_printf(m, "# %s| / _---=> hardirq/softirq\n", + seq_printf(m, "# %s| / _----=> need-resched_lazy\n", + tgid ? tgid_space : space); + seq_printf(m, "# %s|| / _---=> hardirq/softirq\n", tgid ? tgid_space : space); - seq_printf(m, "# %s|| / _--=> preempt-depth\n", + seq_printf(m, "# %s||| / _--=> preempt-depth\n", tgid ? tgid_space : space); - seq_printf(m, "# %s||| / delay\n", + seq_printf(m, "# %s|||| / delay\n", tgid ? tgid_space : space); - seq_printf(m, "# TASK-PID CPU#%s|||| TIMESTAMP FUNCTION\n", + seq_printf(m, "# TASK-PID CPU#%s||||| TIMESTAMP FUNCTION\n", tgid ? " TGID " : space); - seq_printf(m, "# | | | %s|||| | |\n", + seq_printf(m, "# | | | %s||||| | |\n", tgid ? " | " : space); } @@ -4520,6 +4537,9 @@ static const char readme_msg[] = #ifdef CONFIG_X86_64 " x86-tsc: TSC cycle counter\n" #endif + "\n timestamp_mode\t-view the mode used to timestamp events\n" + " delta: Delta difference against a buffer-wide timestamp\n" + " absolute: Absolute (standalone) timestamp\n" "\n trace_marker\t\t- Writes into this file writes into the kernel buffer\n" "\n trace_marker_raw\t\t- Writes into this file writes binary data into the kernel buffer\n" " tracing_cpumask\t- Limit which CPUs to trace\n" @@ -4696,8 +4716,9 @@ static const char readme_msg[] = "\t .sym display an address as a symbol\n" "\t .sym-offset display an address as a symbol and offset\n" "\t .execname display a common_pid as a program name\n" - "\t .syscall display a syscall id as a syscall name\n\n" - "\t .log2 display log2 value rather than raw number\n\n" + "\t .syscall display a syscall id as a syscall name\n" + "\t .log2 display log2 value rather than raw number\n" + "\t .usecs display a common_timestamp in microseconds\n\n" "\t The 'pause' parameter can be used to pause an existing hist\n" "\t trigger or to start a hist trigger but not log any events\n" "\t until told to do so. 'continue' can be used to start or\n" @@ -6207,7 +6228,7 @@ static int tracing_clock_show(struct seq return 0; } -static int tracing_set_clock(struct trace_array *tr, const char *clockstr) +int tracing_set_clock(struct trace_array *tr, const char *clockstr) { int i; @@ -6287,6 +6308,71 @@ static int tracing_clock_open(struct ino return ret; } +static int tracing_time_stamp_mode_show(struct seq_file *m, void *v) +{ + struct trace_array *tr = m->private; + + mutex_lock(&trace_types_lock); + + if (ring_buffer_time_stamp_abs(tr->trace_buffer.buffer)) + seq_puts(m, "delta [absolute]\n"); + else + seq_puts(m, "[delta] absolute\n"); + + mutex_unlock(&trace_types_lock); + + return 0; +} + +static int tracing_time_stamp_mode_open(struct inode *inode, struct file *file) +{ + struct trace_array *tr = inode->i_private; + int ret; + + if (tracing_disabled) + return -ENODEV; + + if (trace_array_get(tr)) + return -ENODEV; + + ret = single_open(file, tracing_time_stamp_mode_show, inode->i_private); + if (ret < 0) + trace_array_put(tr); + + return ret; +} + +int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs) +{ + int ret = 0; + + mutex_lock(&trace_types_lock); + + if (abs && tr->time_stamp_abs_ref++) + goto out; + + if (!abs) { + if (WARN_ON_ONCE(!tr->time_stamp_abs_ref)) { + ret = -EINVAL; + goto out; + } + + if (--tr->time_stamp_abs_ref) + goto out; + } + + ring_buffer_set_time_stamp_abs(tr->trace_buffer.buffer, abs); + +#ifdef CONFIG_TRACER_MAX_TRACE + if (tr->max_buffer.buffer) + ring_buffer_set_time_stamp_abs(tr->max_buffer.buffer, abs); +#endif + out: + mutex_unlock(&trace_types_lock); + + return ret; +} + struct ftrace_buffer_info { struct trace_iterator iter; void *spare; @@ -6534,6 +6620,13 @@ static const struct file_operations trac .write = tracing_clock_write, }; +static const struct file_operations trace_time_stamp_mode_fops = { + .open = tracing_time_stamp_mode_open, + .read = seq_read, + .llseek = seq_lseek, + .release = tracing_single_release_tr, +}; + #ifdef CONFIG_TRACER_SNAPSHOT static const struct file_operations snapshot_fops = { .open = tracing_snapshot_open, @@ -7671,6 +7764,7 @@ static int instance_mkdir(const char *na struct trace_array *tr; int ret; + mutex_lock(&event_mutex); mutex_lock(&trace_types_lock); ret = -EEXIST; @@ -7703,6 +7797,7 @@ static int instance_mkdir(const char *na INIT_LIST_HEAD(&tr->systems); INIT_LIST_HEAD(&tr->events); + INIT_LIST_HEAD(&tr->hist_vars); if (allocate_trace_buffers(tr, trace_buf_size) < 0) goto out_free_tr; @@ -7726,6 +7821,7 @@ static int instance_mkdir(const char *na list_add(&tr->list, &ftrace_trace_arrays); mutex_unlock(&trace_types_lock); + mutex_unlock(&event_mutex); return 0; @@ -7737,6 +7833,7 @@ static int instance_mkdir(const char *na out_unlock: mutex_unlock(&trace_types_lock); + mutex_unlock(&event_mutex); return ret; @@ -7749,6 +7846,7 @@ static int instance_rmdir(const char *na int ret; int i; + mutex_lock(&event_mutex); mutex_lock(&trace_types_lock); ret = -ENODEV; @@ -7794,6 +7892,7 @@ static int instance_rmdir(const char *na out_unlock: mutex_unlock(&trace_types_lock); + mutex_unlock(&event_mutex); return ret; } @@ -7851,6 +7950,9 @@ init_tracer_tracefs(struct trace_array * trace_create_file("tracing_on", 0644, d_tracer, tr, &rb_simple_fops); + trace_create_file("timestamp_mode", 0444, d_tracer, tr, + &trace_time_stamp_mode_fops); + create_trace_options_dir(tr); #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) @@ -8260,6 +8362,92 @@ void ftrace_dump(enum ftrace_dump_mode o } EXPORT_SYMBOL_GPL(ftrace_dump); +int trace_run_command(const char *buf, int (*createfn)(int, char **)) +{ + char **argv; + int argc, ret; + + argc = 0; + ret = 0; + argv = argv_split(GFP_KERNEL, buf, &argc); + if (!argv) + return -ENOMEM; + + if (argc) + ret = createfn(argc, argv); + + argv_free(argv); + + return ret; +} + +#define WRITE_BUFSIZE 4096 + +ssize_t trace_parse_run_command(struct file *file, const char __user *buffer, + size_t count, loff_t *ppos, + int (*createfn)(int, char **)) +{ + char *kbuf, *buf, *tmp; + int ret = 0; + size_t done = 0; + size_t size; + + kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL); + if (!kbuf) + return -ENOMEM; + + while (done < count) { + size = count - done; + + if (size >= WRITE_BUFSIZE) + size = WRITE_BUFSIZE - 1; + + if (copy_from_user(kbuf, buffer + done, size)) { + ret = -EFAULT; + goto out; + } + kbuf[size] = '\0'; + buf = kbuf; + do { + tmp = strchr(buf, '\n'); + if (tmp) { + *tmp = '\0'; + size = tmp - buf + 1; + } else { + size = strlen(buf); + if (done + size < count) { + if (buf != kbuf) + break; + /* This can accept WRITE_BUFSIZE - 2 ('\n' + '\0') */ + pr_warn("Line length is too long: Should be less than %d\n", + WRITE_BUFSIZE - 2); + ret = -EINVAL; + goto out; + } + } + done += size; + + /* Remove comments */ + tmp = strchr(buf, '#'); + + if (tmp) + *tmp = '\0'; + + ret = trace_run_command(buf, createfn); + if (ret) + goto out; + buf += size; + + } while (done < count); + } + ret = done; + +out: + kfree(kbuf); + + return ret; +} + __init static int tracer_alloc_buffers(void) { int ring_buf_size; @@ -8360,6 +8548,7 @@ __init static int tracer_alloc_buffers(v INIT_LIST_HEAD(&global_trace.systems); INIT_LIST_HEAD(&global_trace.events); + INIT_LIST_HEAD(&global_trace.hist_vars); list_add(&global_trace.list, &ftrace_trace_arrays); apply_trace_boot_options(); Index: linux-4.14.15-rt12/kernel/trace/trace.h =================================================================== --- linux-4.14.15-rt12.orig/kernel/trace/trace.h +++ linux-4.14.15-rt12/kernel/trace/trace.h @@ -127,6 +127,7 @@ struct kretprobe_trace_entry_head { * NEED_RESCHED - reschedule is requested * HARDIRQ - inside an interrupt handler * SOFTIRQ - inside a softirq handler + * NEED_RESCHED_LAZY - lazy reschedule is requested */ enum trace_flag_type { TRACE_FLAG_IRQS_OFF = 0x01, @@ -136,6 +137,7 @@ enum trace_flag_type { TRACE_FLAG_SOFTIRQ = 0x10, TRACE_FLAG_PREEMPT_RESCHED = 0x20, TRACE_FLAG_NMI = 0x40, + TRACE_FLAG_NEED_RESCHED_LAZY = 0x80, }; #define TRACE_BUF_SIZE 1024 @@ -273,6 +275,8 @@ struct trace_array { /* function tracing enabled */ int function_enabled; #endif + int time_stamp_abs_ref; + struct list_head hist_vars; }; enum { @@ -286,6 +290,11 @@ extern struct mutex trace_types_lock; extern int trace_array_get(struct trace_array *tr); extern void trace_array_put(struct trace_array *tr); +extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs); +extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); + +extern bool trace_clock_in_ns(struct trace_array *tr); + /* * The global tracer (top) should be the first trace array added, * but we check the flag anyway. @@ -1293,7 +1302,7 @@ __event_trigger_test_discard(struct trac unsigned long eflags = file->flags; if (eflags & EVENT_FILE_FL_TRIGGER_COND) - *tt = event_triggers_call(file, entry); + *tt = event_triggers_call(file, entry, event); if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && @@ -1330,7 +1339,7 @@ event_trigger_unlock_commit(struct trace trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc); if (tt) - event_triggers_post_call(file, tt, entry); + event_triggers_post_call(file, tt, entry, event); } /** @@ -1363,7 +1372,7 @@ event_trigger_unlock_commit_regs(struct irq_flags, pc, regs); if (tt) - event_triggers_post_call(file, tt, entry); + event_triggers_post_call(file, tt, entry, event); } #define FILTER_PRED_INVALID ((unsigned short)-1) @@ -1545,6 +1554,8 @@ extern void pause_named_trigger(struct e extern void unpause_named_trigger(struct event_trigger_data *data); extern void set_named_trigger_data(struct event_trigger_data *data, struct event_trigger_data *named_data); +extern struct event_trigger_data * +get_named_trigger_data(struct event_trigger_data *data); extern int register_event_command(struct event_command *cmd); extern int unregister_event_command(struct event_command *cmd); extern int register_trigger_hist_enable_disable_cmds(void); @@ -1588,7 +1599,8 @@ extern int register_trigger_hist_enable_ */ struct event_trigger_ops { void (*func)(struct event_trigger_data *data, - void *rec); + void *rec, + struct ring_buffer_event *rbe); int (*init)(struct event_trigger_ops *ops, struct event_trigger_data *data); void (*free)(struct event_trigger_ops *ops, @@ -1755,6 +1767,13 @@ void trace_printk_start_comm(void); int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); +#define MAX_EVENT_NAME_LEN 64 + +extern int trace_run_command(const char *buf, int (*createfn)(int, char**)); +extern ssize_t trace_parse_run_command(struct file *file, + const char __user *buffer, size_t count, loff_t *ppos, + int (*createfn)(int, char**)); + /* * Normal trace_printk() and friends allocates special buffers * to do the manipulation, as well as saves the print formats Index: linux-4.14.15-rt12/kernel/trace/trace_events.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/trace/trace_events.c +++ linux-4.14.15-rt12/kernel/trace/trace_events.c @@ -187,6 +187,8 @@ static int trace_define_common_fields(vo __common_field(unsigned char, flags); __common_field(unsigned char, preempt_count); __common_field(int, pid); + __common_field(unsigned short, migrate_disable); + __common_field(unsigned short, padding); return ret; } @@ -1406,8 +1408,8 @@ static int subsystem_open(struct inode * return -ENODEV; /* Make sure the system still exists */ - mutex_lock(&trace_types_lock); mutex_lock(&event_mutex); + mutex_lock(&trace_types_lock); list_for_each_entry(tr, &ftrace_trace_arrays, list) { list_for_each_entry(dir, &tr->systems, list) { if (dir == inode->i_private) { @@ -1421,8 +1423,8 @@ static int subsystem_open(struct inode * } } exit_loop: - mutex_unlock(&event_mutex); mutex_unlock(&trace_types_lock); + mutex_unlock(&event_mutex); if (!system) return -ENODEV; @@ -2308,15 +2310,15 @@ static void __add_event_to_tracers(struc int trace_add_event_call(struct trace_event_call *call) { int ret; - mutex_lock(&trace_types_lock); mutex_lock(&event_mutex); + mutex_lock(&trace_types_lock); ret = __register_event(call, NULL); if (ret >= 0) __add_event_to_tracers(call); - mutex_unlock(&event_mutex); mutex_unlock(&trace_types_lock); + mutex_unlock(&event_mutex); return ret; } @@ -2370,13 +2372,13 @@ int trace_remove_event_call(struct trace { int ret; - mutex_lock(&trace_types_lock); mutex_lock(&event_mutex); + mutex_lock(&trace_types_lock); down_write(&trace_event_sem); ret = probe_remove_event_call(call); up_write(&trace_event_sem); - mutex_unlock(&event_mutex); mutex_unlock(&trace_types_lock); + mutex_unlock(&event_mutex); return ret; } @@ -2438,8 +2440,8 @@ static int trace_module_notify(struct no { struct module *mod = data; - mutex_lock(&trace_types_lock); mutex_lock(&event_mutex); + mutex_lock(&trace_types_lock); switch (val) { case MODULE_STATE_COMING: trace_module_add_events(mod); @@ -2448,8 +2450,8 @@ static int trace_module_notify(struct no trace_module_remove_events(mod); break; } - mutex_unlock(&event_mutex); mutex_unlock(&trace_types_lock); + mutex_unlock(&event_mutex); return 0; } @@ -2964,24 +2966,24 @@ create_event_toplevel_files(struct dentr * creates the event hierachry in the @parent/events directory. * * Returns 0 on success. + * + * Must be called with event_mutex held. */ int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) { int ret; - mutex_lock(&event_mutex); + lockdep_assert_held(&event_mutex); ret = create_event_toplevel_files(parent, tr); if (ret) - goto out_unlock; + goto out; down_write(&trace_event_sem); __trace_add_event_dirs(tr); up_write(&trace_event_sem); - out_unlock: - mutex_unlock(&event_mutex); - + out: return ret; } @@ -3010,9 +3012,10 @@ early_event_add_tracer(struct dentry *pa return ret; } +/* Must be called with event_mutex held */ int event_trace_del_tracer(struct trace_array *tr) { - mutex_lock(&event_mutex); + lockdep_assert_held(&event_mutex); /* Disable any event triggers and associated soft-disabled events */ clear_event_triggers(tr); @@ -3033,8 +3036,6 @@ int event_trace_del_tracer(struct trace_ tr->event_dir = NULL; - mutex_unlock(&event_mutex); - return 0; } Index: linux-4.14.15-rt12/kernel/trace/trace_events_hist.c =================================================================== --- linux-4.14.15-rt12.orig/kernel/trace/trace_events_hist.c +++ linux-4.14.15-rt12/kernel/trace/trace_events_hist.c @@ -20,13 +20,39 @@ #include #include #include +#include #include "tracing_map.h" #include "trace.h" +#define SYNTH_SYSTEM "synthetic" +#define SYNTH_FIELDS_MAX 16 + +#define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */ + struct hist_field; -typedef u64 (*hist_field_fn_t) (struct hist_field *field, void *event); +typedef u64 (*hist_field_fn_t) (struct hist_field *field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event); + +#define HIST_FIELD_OPERANDS_MAX 2 +#define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX) +#define HIST_ACTIONS_MAX 8 + +enum field_op_id { + FIELD_OP_NONE, + FIELD_OP_PLUS, + FIELD_OP_MINUS, + FIELD_OP_UNARY_MINUS, +}; + +struct hist_var { + char *name; + struct hist_trigger_data *hist_data; + unsigned int idx; +}; struct hist_field { struct ftrace_event_field *field; @@ -34,26 +60,50 @@ struct hist_field { hist_field_fn_t fn; unsigned int size; unsigned int offset; + unsigned int is_signed; + const char *type; + struct hist_field *operands[HIST_FIELD_OPERANDS_MAX]; + struct hist_trigger_data *hist_data; + struct hist_var var; + enum field_op_id operator; + char *system; + char *event_name; + char *name; + unsigned int var_idx; + unsigned int var_ref_idx; + bool read_once; }; -static u64 hist_field_none(struct hist_field *field, void *event) +static u64 hist_field_none(struct hist_field *field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) { return 0; } -static u64 hist_field_counter(struct hist_field *field, void *event) +static u64 hist_field_counter(struct hist_field *field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) { return 1; } -static u64 hist_field_string(struct hist_field *hist_field, void *event) +static u64 hist_field_string(struct hist_field *hist_field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) { char *addr = (char *)(event + hist_field->field->offset); return (u64)(unsigned long)addr; } -static u64 hist_field_dynstring(struct hist_field *hist_field, void *event) +static u64 hist_field_dynstring(struct hist_field *hist_field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) { u32 str_item = *(u32 *)(event + hist_field->field->offset); int str_loc = str_item & 0xffff; @@ -62,22 +112,74 @@ static u64 hist_field_dynstring(struct h return (u64)(unsigned long)addr; } -static u64 hist_field_pstring(struct hist_field *hist_field, void *event) +static u64 hist_field_pstring(struct hist_field *hist_field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) { char **addr = (char **)(event + hist_field->field->offset); return (u64)(unsigned long)*addr; } -static u64 hist_field_log2(struct hist_field *hist_field, void *event) +static u64 hist_field_log2(struct hist_field *hist_field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) { - u64 val = *(u64 *)(event + hist_field->field->offset); + struct hist_field *operand = hist_field->operands[0]; + + u64 val = operand->fn(operand, elt, rbe, event); return (u64) ilog2(roundup_pow_of_two(val)); } +static u64 hist_field_plus(struct hist_field *hist_field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) +{ + struct hist_field *operand1 = hist_field->operands[0]; + struct hist_field *operand2 = hist_field->operands[1]; + + u64 val1 = operand1->fn(operand1, elt, rbe, event); + u64 val2 = operand2->fn(operand2, elt, rbe, event); + + return val1 + val2; +} + +static u64 hist_field_minus(struct hist_field *hist_field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) +{ + struct hist_field *operand1 = hist_field->operands[0]; + struct hist_field *operand2 = hist_field->operands[1]; + + u64 val1 = operand1->fn(operand1, elt, rbe, event); + u64 val2 = operand2->fn(operand2, elt, rbe, event); + + return val1 - val2; +} + +static u64 hist_field_unary_minus(struct hist_field *hist_field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) +{ + struct hist_field *operand = hist_field->operands[0]; + + s64 sval = (s64)operand->fn(operand, elt, rbe, event); + u64 val = (u64)-sval; + + return val; +} + #define DEFINE_HIST_FIELD_FN(type) \ -static u64 hist_field_##type(struct hist_field *hist_field, void *event)\ + static u64 hist_field_##type(struct hist_field *hist_field, \ + struct tracing_map_elt *elt, \ + struct ring_buffer_event *rbe, \ + void *event) \ { \ type *addr = (type *)(event + hist_field->field->offset); \ \ @@ -110,16 +212,29 @@ DEFINE_HIST_FIELD_FN(u8); #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE) enum hist_field_flags { - HIST_FIELD_FL_HITCOUNT = 1, - HIST_FIELD_FL_KEY = 2, - HIST_FIELD_FL_STRING = 4, - HIST_FIELD_FL_HEX = 8, - HIST_FIELD_FL_SYM = 16, - HIST_FIELD_FL_SYM_OFFSET = 32, - HIST_FIELD_FL_EXECNAME = 64, - HIST_FIELD_FL_SYSCALL = 128, - HIST_FIELD_FL_STACKTRACE = 256, - HIST_FIELD_FL_LOG2 = 512, + HIST_FIELD_FL_HITCOUNT = 1 << 0, + HIST_FIELD_FL_KEY = 1 << 1, + HIST_FIELD_FL_STRING = 1 << 2, + HIST_FIELD_FL_HEX = 1 << 3, + HIST_FIELD_FL_SYM = 1 << 4, + HIST_FIELD_FL_SYM_OFFSET = 1 << 5, + HIST_FIELD_FL_EXECNAME = 1 << 6, + HIST_FIELD_FL_SYSCALL = 1 << 7, + HIST_FIELD_FL_STACKTRACE = 1 << 8, + HIST_FIELD_FL_LOG2 = 1 << 9, + HIST_FIELD_FL_TIMESTAMP = 1 << 10, + HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11, + HIST_FIELD_FL_VAR = 1 << 12, + HIST_FIELD_FL_EXPR = 1 << 13, + HIST_FIELD_FL_VAR_REF = 1 << 14, + HIST_FIELD_FL_CPU = 1 << 15, + HIST_FIELD_FL_ALIAS = 1 << 16, +}; + +struct var_defs { + unsigned int n_vars; + char *name[TRACING_MAP_VARS_MAX]; + char *expr[TRACING_MAP_VARS_MAX]; }; struct hist_trigger_attrs { @@ -127,298 +242,3583 @@ struct hist_trigger_attrs { char *vals_str; char *sort_key_str; char *name; + char *clock; bool pause; bool cont; bool clear; + bool ts_in_usecs; unsigned int map_bits; + + char *assignment_str[TRACING_MAP_VARS_MAX]; + unsigned int n_assignments; + + char *action_str[HIST_ACTIONS_MAX]; + unsigned int n_actions; + + struct var_defs var_defs; +}; + +struct field_var { + struct hist_field *var; + struct hist_field *val; +}; + +struct field_var_hist { + struct hist_trigger_data *hist_data; + char *cmd; }; struct hist_trigger_data { - struct hist_field *fields[TRACING_MAP_FIELDS_MAX]; + struct hist_field *fields[HIST_FIELDS_MAX]; unsigned int n_vals; unsigned int n_keys; unsigned int n_fields; + unsigned int n_vars; unsigned int key_size; struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX]; unsigned int n_sort_keys; struct trace_event_file *event_file; struct hist_trigger_attrs *attrs; struct tracing_map *map; + bool enable_timestamps; + bool remove; + struct hist_field *var_refs[TRACING_MAP_VARS_MAX]; + unsigned int n_var_refs; + + struct action_data *actions[HIST_ACTIONS_MAX]; + unsigned int n_actions; + + struct hist_field *synth_var_refs[SYNTH_FIELDS_MAX]; + unsigned int n_synth_var_refs; + struct field_var *field_vars[SYNTH_FIELDS_MAX]; + unsigned int n_field_vars; + unsigned int n_field_var_str; + struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX]; + unsigned int n_field_var_hists; + + struct field_var *max_vars[SYNTH_FIELDS_MAX]; + unsigned int n_max_vars; + unsigned int n_max_var_str; }; -static hist_field_fn_t select_value_fn(int field_size, int field_is_signed) -{ - hist_field_fn_t fn = NULL; +struct synth_field { + char *type; + char *name; + size_t size; + bool is_signed; + bool is_string; +}; - switch (field_size) { - case 8: - if (field_is_signed) - fn = hist_field_s64; - else - fn = hist_field_u64; - break; - case 4: - if (field_is_signed) - fn = hist_field_s32; - else - fn = hist_field_u32; - break; - case 2: - if (field_is_signed) - fn = hist_field_s16; - else - fn = hist_field_u16; - break; - case 1: - if (field_is_signed) - fn = hist_field_s8; - else - fn = hist_field_u8; - break; - } +struct synth_event { + struct list_head list; + int ref; + char *name; + struct synth_field **fields; + unsigned int n_fields; + unsigned int n_u64; + struct trace_event_class class; + struct trace_event_call call; + struct tracepoint *tp; +}; - return fn; +struct action_data; + +typedef void (*action_fn_t) (struct hist_trigger_data *hist_data, + struct tracing_map_elt *elt, void *rec, + struct ring_buffer_event *rbe, + struct action_data *data, u64 *var_ref_vals); + +struct action_data { + action_fn_t fn; + unsigned int n_params; + char *params[SYNTH_FIELDS_MAX]; + + union { + struct { + unsigned int var_ref_idx; + char *match_event; + char *match_event_system; + char *synth_event_name; + struct synth_event *synth_event; + } onmatch; + + struct { + char *var_str; + char *fn_name; + unsigned int max_var_ref_idx; + struct hist_field *max_var; + struct hist_field *var; + } onmax; + }; +}; + + +static char last_hist_cmd[MAX_FILTER_STR_VAL]; +static char hist_err_str[MAX_FILTER_STR_VAL]; + +static void last_cmd_set(char *str) +{ + if (!str) + return; + + strncpy(last_hist_cmd, str, MAX_FILTER_STR_VAL - 1); } -static int parse_map_size(char *str) +static void hist_err(char *str, char *var) { - unsigned long size, map_bits; - int ret; + int maxlen = MAX_FILTER_STR_VAL - 1; - strsep(&str, "="); - if (!str) { - ret = -EINVAL; - goto out; - } + if (!str) + return; - ret = kstrtoul(str, 0, &size); - if (ret) - goto out; + if (strlen(hist_err_str)) + return; - map_bits = ilog2(roundup_pow_of_two(size)); - if (map_bits < TRACING_MAP_BITS_MIN || - map_bits > TRACING_MAP_BITS_MAX) - ret = -EINVAL; - else - ret = map_bits; - out: - return ret; + if (!var) + var = ""; + + if (strlen(hist_err_str) + strlen(str) + strlen(var) > maxlen) + return; + + strcat(hist_err_str, str); + strcat(hist_err_str, var); } -static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs) +static void hist_err_event(char *str, char *system, char *event, char *var) { - if (!attrs) - return; + char err[MAX_FILTER_STR_VAL]; - kfree(attrs->name); - kfree(attrs->sort_key_str); - kfree(attrs->keys_str); - kfree(attrs->vals_str); - kfree(attrs); + if (system && var) + snprintf(err, MAX_FILTER_STR_VAL, "%s.%s.%s", system, event, var); + else if (system) + snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event); + else + strncpy(err, var, MAX_FILTER_STR_VAL); + + hist_err(str, err); } -static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str) +static void hist_err_clear(void) { - struct hist_trigger_attrs *attrs; - int ret = 0; + hist_err_str[0] = '\0'; +} - attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); - if (!attrs) - return ERR_PTR(-ENOMEM); +static bool have_hist_err(void) +{ + if (strlen(hist_err_str)) + return true; - while (trigger_str) { - char *str = strsep(&trigger_str, ":"); + return false; +} - if ((strncmp(str, "key=", strlen("key=")) == 0) || - (strncmp(str, "keys=", strlen("keys=")) == 0)) - attrs->keys_str = kstrdup(str, GFP_KERNEL); - else if ((strncmp(str, "val=", strlen("val=")) == 0) || - (strncmp(str, "vals=", strlen("vals=")) == 0) || - (strncmp(str, "values=", strlen("values=")) == 0)) - attrs->vals_str = kstrdup(str, GFP_KERNEL); - else if (strncmp(str, "sort=", strlen("sort=")) == 0) - attrs->sort_key_str = kstrdup(str, GFP_KERNEL); - else if (strncmp(str, "name=", strlen("name=")) == 0) - attrs->name = kstrdup(str, GFP_KERNEL); - else if (strcmp(str, "pause") == 0) - attrs->pause = true; - else if ((strcmp(str, "cont") == 0) || - (strcmp(str, "continue") == 0)) - attrs->cont = true; - else if (strcmp(str, "clear") == 0) - attrs->clear = true; - else if (strncmp(str, "size=", strlen("size=")) == 0) { - int map_bits = parse_map_size(str); +static LIST_HEAD(synth_event_list); +static DEFINE_MUTEX(synth_event_mutex); - if (map_bits < 0) { - ret = map_bits; - goto free; - } - attrs->map_bits = map_bits; +struct synth_trace_event { + struct trace_entry ent; + u64 fields[]; +}; + +static int synth_event_define_fields(struct trace_event_call *call) +{ + struct synth_trace_event trace; + int offset = offsetof(typeof(trace), fields); + struct synth_event *event = call->data; + unsigned int i, size, n_u64; + char *name, *type; + bool is_signed; + int ret = 0; + + for (i = 0, n_u64 = 0; i < event->n_fields; i++) { + size = event->fields[i]->size; + is_signed = event->fields[i]->is_signed; + type = event->fields[i]->type; + name = event->fields[i]->name; + ret = trace_define_field(call, type, name, offset, size, + is_signed, FILTER_OTHER); + if (ret) + break; + + if (event->fields[i]->is_string) { + offset += STR_VAR_LEN_MAX; + n_u64 += STR_VAR_LEN_MAX / sizeof(u64); } else { - ret = -EINVAL; - goto free; + offset += sizeof(u64); + n_u64++; } } - if (!attrs->keys_str) { - ret = -EINVAL; - goto free; - } + event->n_u64 = n_u64; - return attrs; - free: - destroy_hist_trigger_attrs(attrs); + return ret; +} - return ERR_PTR(ret); +static bool synth_field_signed(char *type) +{ + if (strncmp(type, "u", 1) == 0) + return false; + + return true; } -static inline void save_comm(char *comm, struct task_struct *task) +static int synth_field_is_string(char *type) { - if (!task->pid) { - strcpy(comm, ""); - return; + if (strstr(type, "char[") != NULL) + return true; + + return false; +} + +static int synth_field_string_size(char *type) +{ + char buf[4], *end, *start; + unsigned int len; + int size, err; + + start = strstr(type, "char["); + if (start == NULL) + return -EINVAL; + start += strlen("char["); + + end = strchr(type, ']'); + if (!end || end < start) + return -EINVAL; + + len = end - start; + if (len > 3) + return -EINVAL; + + strncpy(buf, start, len); + buf[len] = '\0'; + + err = kstrtouint(buf, 0, &size); + if (err) + return err; + + if (size > STR_VAR_LEN_MAX) + return -EINVAL; + + return size; +} + +static int synth_field_size(char *type) +{ + int size = 0; + + if (strcmp(type, "s64") == 0) + size = sizeof(s64); + else if (strcmp(type, "u64") == 0) + size = sizeof(u64); + else if (strcmp(type, "s32") == 0) + size = sizeof(s32); + else if (strcmp(type, "u32") == 0) + size = sizeof(u32); + else if (strcmp(type, "s16") == 0) + size = sizeof(s16); + else if (strcmp(type, "u16") == 0) + size = sizeof(u16); + else if (strcmp(type, "s8") == 0) + size = sizeof(s8); + else if (strcmp(type, "u8") == 0) + size = sizeof(u8); + else if (strcmp(type, "char") == 0) + size = sizeof(char); + else if (strcmp(type, "unsigned char") == 0) + size = sizeof(unsigned char); + else if (strcmp(type, "int") == 0) + size = sizeof(int); + else if (strcmp(type, "unsigned int") == 0) + size = sizeof(unsigned int); + else if (strcmp(type, "long") == 0) + size = sizeof(long); + else if (strcmp(type, "unsigned long") == 0) + size = sizeof(unsigned long); + else if (strcmp(type, "pid_t") == 0) + size = sizeof(pid_t); + else if (synth_field_is_string(type)) + size = synth_field_string_size(type); + + return size; +} + +static const char *synth_field_fmt(char *type) +{ + const char *fmt = "%llu"; + + if (strcmp(type, "s64") == 0) + fmt = "%lld"; + else if (strcmp(type, "u64") == 0) + fmt = "%llu"; + else if (strcmp(type, "s32") == 0) + fmt = "%d"; + else if (strcmp(type, "u32") == 0) + fmt = "%u"; + else if (strcmp(type, "s16") == 0) + fmt = "%d"; + else if (strcmp(type, "u16") == 0) + fmt = "%u"; + else if (strcmp(type, "s8") == 0) + fmt = "%d"; + else if (strcmp(type, "u8") == 0) + fmt = "%u"; + else if (strcmp(type, "char") == 0) + fmt = "%d"; + else if (strcmp(type, "unsigned char") == 0) + fmt = "%u"; + else if (strcmp(type, "int") == 0) + fmt = "%d"; + else if (strcmp(type, "unsigned int") == 0) + fmt = "%u"; + else if (strcmp(type, "long") == 0) + fmt = "%ld"; + else if (strcmp(type, "unsigned long") == 0) + fmt = "%lu"; + else if (strcmp(type, "pid_t") == 0) + fmt = "%d"; + else if (synth_field_is_string(type)) + fmt = "%s"; + + return fmt; +} + +static enum print_line_t print_synth_event(struct trace_iterator *iter, + int flags, + struct trace_event *event) +{ + struct trace_array *tr = iter->tr; + struct trace_seq *s = &iter->seq; + struct synth_trace_event *entry; + struct synth_event *se; + unsigned int i, n_u64; + char print_fmt[32]; + const char *fmt; + + entry = (struct synth_trace_event *)iter->ent; + se = container_of(event, struct synth_event, call.event); + + trace_seq_printf(s, "%s: ", se->name); + + for (i = 0, n_u64 = 0; i < se->n_fields; i++) { + if (trace_seq_has_overflowed(s)) + goto end; + + fmt = synth_field_fmt(se->fields[i]->type); + + /* parameter types */ + if (tr->trace_flags & TRACE_ITER_VERBOSE) + trace_seq_printf(s, "%s ", fmt); + + snprintf(print_fmt, sizeof(print_fmt), "%%s=%s%%s", fmt); + + /* parameter values */ + if (se->fields[i]->is_string) { + trace_seq_printf(s, print_fmt, se->fields[i]->name, + (char *)&entry->fields[n_u64], + i == se->n_fields - 1 ? "" : " "); + n_u64 += STR_VAR_LEN_MAX / sizeof(u64); + } else { + trace_seq_printf(s, print_fmt, se->fields[i]->name, + entry->fields[n_u64], + i == se->n_fields - 1 ? "" : " "); + n_u64++; + } } +end: + trace_seq_putc(s, '\n'); - if (WARN_ON_ONCE(task->pid < 0)) { - strcpy(comm, ""); + return trace_handle_return(s); +} + +static struct trace_event_functions synth_event_funcs = { + .trace = print_synth_event +}; + +static notrace void trace_event_raw_event_synth(void *__data, + u64 *var_ref_vals, + unsigned int var_ref_idx) +{ + struct trace_event_file *trace_file = __data; + struct synth_trace_event *entry; + struct trace_event_buffer fbuffer; + struct ring_buffer *buffer; + struct synth_event *event; + unsigned int i, n_u64; + int fields_size = 0; + + event = trace_file->event_call->data; + + if (trace_trigger_soft_disabled(trace_file)) return; + + fields_size = event->n_u64 * sizeof(u64); + + /* + * Avoid ring buffer recursion detection, as this event + * is being performed within another event. + */ + buffer = trace_file->tr->trace_buffer.buffer; + ring_buffer_nest_start(buffer); + + entry = trace_event_buffer_reserve(&fbuffer, trace_file, + sizeof(*entry) + fields_size); + if (!entry) + goto out; + + for (i = 0, n_u64 = 0; i < event->n_fields; i++) { + if (event->fields[i]->is_string) { + char *str_val = (char *)(long)var_ref_vals[var_ref_idx + i]; + char *str_field = (char *)&entry->fields[n_u64]; + + strncpy(str_field, str_val, STR_VAR_LEN_MAX); + n_u64 += STR_VAR_LEN_MAX / sizeof(u64); + } else { + entry->fields[n_u64] = var_ref_vals[var_ref_idx + i]; + n_u64++; + } } - memcpy(comm, task->comm, TASK_COMM_LEN); + trace_event_buffer_commit(&fbuffer); +out: + ring_buffer_nest_end(buffer); } -static void hist_trigger_elt_comm_free(struct tracing_map_elt *elt) +static void free_synth_event_print_fmt(struct trace_event_call *call) { - kfree((char *)elt->private_data); + if (call) { + kfree(call->print_fmt); + call->print_fmt = NULL; + } } -static int hist_trigger_elt_comm_alloc(struct tracing_map_elt *elt) +static int __set_synth_event_print_fmt(struct synth_event *event, + char *buf, int len) { - struct hist_trigger_data *hist_data = elt->map->private_data; - struct hist_field *key_field; - unsigned int i; + const char *fmt; + int pos = 0; + int i; - for_each_hist_key_field(i, hist_data) { - key_field = hist_data->fields[i]; + /* When len=0, we just calculate the needed length */ +#define LEN_OR_ZERO (len ? len - pos : 0) - if (key_field->flags & HIST_FIELD_FL_EXECNAME) { - unsigned int size = TASK_COMM_LEN + 1; + pos += snprintf(buf + pos, LEN_OR_ZERO, "\""); + for (i = 0; i < event->n_fields; i++) { + fmt = synth_field_fmt(event->fields[i]->type); + pos += snprintf(buf + pos, LEN_OR_ZERO, "%s=%s%s", + event->fields[i]->name, fmt, + i == event->n_fields - 1 ? "" : ", "); + } + pos += snprintf(buf + pos, LEN_OR_ZERO, "\""); - elt->private_data = kzalloc(size, GFP_KERNEL); - if (!elt->private_data) - return -ENOMEM; - break; - } + for (i = 0; i < event->n_fields; i++) { + pos += snprintf(buf + pos, LEN_OR_ZERO, + ", REC->%s", event->fields[i]->name); } - return 0; +#undef LEN_OR_ZERO + + /* return the length of print_fmt */ + return pos; } -static void hist_trigger_elt_comm_copy(struct tracing_map_elt *to, - struct tracing_map_elt *from) +static int set_synth_event_print_fmt(struct trace_event_call *call) { - char *comm_from = from->private_data; - char *comm_to = to->private_data; + struct synth_event *event = call->data; + char *print_fmt; + int len; - if (comm_from) - memcpy(comm_to, comm_from, TASK_COMM_LEN + 1); -} + /* First: called with 0 length to calculate the needed length */ + len = __set_synth_event_print_fmt(event, NULL, 0); -static void hist_trigger_elt_comm_init(struct tracing_map_elt *elt) -{ - char *comm = elt->private_data; + print_fmt = kmalloc(len + 1, GFP_KERNEL); + if (!print_fmt) + return -ENOMEM; - if (comm) - save_comm(comm, current); -} + /* Second: actually write the @print_fmt */ + __set_synth_event_print_fmt(event, print_fmt, len + 1); + call->print_fmt = print_fmt; -static const struct tracing_map_ops hist_trigger_elt_comm_ops = { - .elt_alloc = hist_trigger_elt_comm_alloc, - .elt_copy = hist_trigger_elt_comm_copy, - .elt_free = hist_trigger_elt_comm_free, - .elt_init = hist_trigger_elt_comm_init, -}; + return 0; +} -static void destroy_hist_field(struct hist_field *hist_field) +static void free_synth_field(struct synth_field *field) { - kfree(hist_field); + kfree(field->type); + kfree(field->name); + kfree(field); } -static struct hist_field *create_hist_field(struct ftrace_event_field *field, - unsigned long flags) +static struct synth_field *parse_synth_field(char *field_type, + char *field_name) { - struct hist_field *hist_field; + struct synth_field *field; + int len, ret = 0; + char *array; - if (field && is_function_field(field)) - return NULL; + if (field_type[0] == ';') + field_type++; - hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL); - if (!hist_field) - return NULL; + len = strlen(field_name); + if (field_name[len - 1] == ';') + field_name[len - 1] = '\0'; - if (flags & HIST_FIELD_FL_HITCOUNT) { - hist_field->fn = hist_field_counter; - goto out; + field = kzalloc(sizeof(*field), GFP_KERNEL); + if (!field) + return ERR_PTR(-ENOMEM); + + len = strlen(field_type) + 1; + array = strchr(field_name, '['); + if (array) + len += strlen(array); + field->type = kzalloc(len, GFP_KERNEL); + if (!field->type) { + ret = -ENOMEM; + goto free; + } + strcat(field->type, field_type); + if (array) { + strcat(field->type, array); + *array = '\0'; } - if (flags & HIST_FIELD_FL_STACKTRACE) { - hist_field->fn = hist_field_none; - goto out; + field->size = synth_field_size(field->type); + if (!field->size) { + ret = -EINVAL; + goto free; } - if (flags & HIST_FIELD_FL_LOG2) { - hist_field->fn = hist_field_log2; - goto out; + if (synth_field_is_string(field->type)) + field->is_string = true; + + field->is_signed = synth_field_signed(field->type); + + field->name = kstrdup(field_name, GFP_KERNEL); + if (!field->name) { + ret = -ENOMEM; + goto free; } + out: + return field; + free: + free_synth_field(field); + field = ERR_PTR(ret); + goto out; +} - if (WARN_ON_ONCE(!field)) - goto out; +static void free_synth_tracepoint(struct tracepoint *tp) +{ + if (!tp) + return; + + kfree(tp->name); + kfree(tp); +} + +static struct tracepoint *alloc_synth_tracepoint(char *name) +{ + struct tracepoint *tp; + + tp = kzalloc(sizeof(*tp), GFP_KERNEL); + if (!tp) + return ERR_PTR(-ENOMEM); + + tp->name = kstrdup(name, GFP_KERNEL); + if (!tp->name) { + kfree(tp); + return ERR_PTR(-ENOMEM); + } + + return tp; +} + +typedef void (*synth_probe_func_t) (void *__data, u64 *var_ref_vals, + unsigned int var_ref_idx); + +static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals, + unsigned int var_ref_idx) +{ + struct tracepoint *tp = event->tp; + + if (unlikely(atomic_read(&tp->key.enabled) > 0)) { + struct tracepoint_func *probe_func_ptr; + synth_probe_func_t probe_func; + void *__data; + + if (!(cpu_online(raw_smp_processor_id()))) + return; + + probe_func_ptr = rcu_dereference_sched((tp)->funcs); + if (probe_func_ptr) { + do { + probe_func = probe_func_ptr->func; + __data = probe_func_ptr->data; + probe_func(__data, var_ref_vals, var_ref_idx); + } while ((++probe_func_ptr)->func); + } + } +} + +static struct synth_event *find_synth_event(const char *name) +{ + struct synth_event *event; + + list_for_each_entry(event, &synth_event_list, list) { + if (strcmp(event->name, name) == 0) + return event; + } + + return NULL; +} + +static int register_synth_event(struct synth_event *event) +{ + struct trace_event_call *call = &event->call; + int ret = 0; + + event->call.class = &event->class; + event->class.system = kstrdup(SYNTH_SYSTEM, GFP_KERNEL); + if (!event->class.system) { + ret = -ENOMEM; + goto out; + } + + event->tp = alloc_synth_tracepoint(event->name); + if (IS_ERR(event->tp)) { + ret = PTR_ERR(event->tp); + event->tp = NULL; + goto out; + } + + INIT_LIST_HEAD(&call->class->fields); + call->event.funcs = &synth_event_funcs; + call->class->define_fields = synth_event_define_fields; + + ret = register_trace_event(&call->event); + if (!ret) { + ret = -ENODEV; + goto out; + } + call->flags = TRACE_EVENT_FL_TRACEPOINT; + call->class->reg = trace_event_reg; + call->class->probe = trace_event_raw_event_synth; + call->data = event; + call->tp = event->tp; + + ret = trace_add_event_call(call); + if (ret) { + pr_warn("Failed to register synthetic event: %s\n", + trace_event_name(call)); + goto err; + } + + ret = set_synth_event_print_fmt(call); + if (ret < 0) { + trace_remove_event_call(call); + goto err; + } + out: + return ret; + err: + unregister_trace_event(&call->event); + goto out; +} + +static int unregister_synth_event(struct synth_event *event) +{ + struct trace_event_call *call = &event->call; + int ret; + + ret = trace_remove_event_call(call); + + return ret; +} + +static void free_synth_event(struct synth_event *event) +{ + unsigned int i; + + if (!event) + return; + + for (i = 0; i < event->n_fields; i++) + free_synth_field(event->fields[i]); + + kfree(event->fields); + kfree(event->name); + kfree(event->class.system); + free_synth_tracepoint(event->tp); + free_synth_event_print_fmt(&event->call); + kfree(event); +} + +static struct synth_event *alloc_synth_event(char *event_name, int n_fields, + struct synth_field **fields) +{ + struct synth_event *event; + unsigned int i; + + event = kzalloc(sizeof(*event), GFP_KERNEL); + if (!event) { + event = ERR_PTR(-ENOMEM); + goto out; + } + + event->name = kstrdup(event_name, GFP_KERNEL); + if (!event->name) { + kfree(event); + event = ERR_PTR(-ENOMEM); + goto out; + } + + event->fields = kcalloc(n_fields, sizeof(*event->fields), GFP_KERNEL); + if (!event->fields) { + free_synth_event(event); + event = ERR_PTR(-ENOMEM); + goto out; + } + + for (i = 0; i < n_fields; i++) + event->fields[i] = fields[i]; + + event->n_fields = n_fields; + out: + return event; +} + +static void action_trace(struct hist_trigger_data *hist_data, + struct tracing_map_elt *elt, void *rec, + struct ring_buffer_event *rbe, + struct action_data *data, u64 *var_ref_vals) +{ + struct synth_event *event = data->onmatch.synth_event; + + trace_synth(event, var_ref_vals, data->onmatch.var_ref_idx); +} + +struct hist_var_data { + struct list_head list; + struct hist_trigger_data *hist_data; +}; + +static void add_or_delete_synth_event(struct synth_event *event, int delete) +{ + if (delete) + free_synth_event(event); + else { + mutex_lock(&synth_event_mutex); + if (!find_synth_event(event->name)) + list_add(&event->list, &synth_event_list); + else + free_synth_event(event); + mutex_unlock(&synth_event_mutex); + } +} + +static int create_synth_event(int argc, char **argv) +{ + struct synth_field *field, *fields[SYNTH_FIELDS_MAX]; + struct synth_event *event = NULL; + bool delete_event = false; + int i, n_fields = 0, ret = 0; + char *name; + + mutex_lock(&synth_event_mutex); + + /* + * Argument syntax: + * - Add synthetic event: field[;field] ... + * - Remove synthetic event: ! field[;field] ... + * where 'field' = type field_name + */ + if (argc < 1) { + ret = -EINVAL; + goto out; + } + + name = argv[0]; + if (name[0] == '!') { + delete_event = true; + name++; + } + + event = find_synth_event(name); + if (event) { + if (delete_event) { + if (event->ref) { + event = NULL; + ret = -EBUSY; + goto out; + } + list_del(&event->list); + goto out; + } + event = NULL; + ret = -EEXIST; + goto out; + } else if (delete_event) + goto out; + + if (argc < 2) { + ret = -EINVAL; + goto out; + } + + for (i = 1; i < argc - 1; i++) { + if (strcmp(argv[i], ";") == 0) + continue; + if (n_fields == SYNTH_FIELDS_MAX) { + ret = -EINVAL; + goto err; + } + + field = parse_synth_field(argv[i], argv[i + 1]); + if (IS_ERR(field)) { + ret = PTR_ERR(field); + goto err; + } + fields[n_fields] = field; + i++; n_fields++; + } + + if (i < argc) { + ret = -EINVAL; + goto err; + } + + event = alloc_synth_event(name, n_fields, fields); + if (IS_ERR(event)) { + ret = PTR_ERR(event); + event = NULL; + goto err; + } + out: + mutex_unlock(&synth_event_mutex); + + if (event) { + if (delete_event) { + ret = unregister_synth_event(event); + add_or_delete_synth_event(event, !ret); + } else { + ret = register_synth_event(event); + add_or_delete_synth_event(event, ret); + } + } + + return ret; + err: + mutex_unlock(&synth_event_mutex); + + for (i = 0; i < n_fields; i++) + free_synth_field(fields[i]); + free_synth_event(event); + + return ret; +} + +static int release_all_synth_events(void) +{ + struct list_head release_events; + struct synth_event *event, *e; + int ret = 0; + + INIT_LIST_HEAD(&release_events); + + mutex_lock(&synth_event_mutex); + + list_for_each_entry(event, &synth_event_list, list) { + if (event->ref) { + mutex_unlock(&synth_event_mutex); + return -EBUSY; + } + } + + list_splice_init(&event->list, &release_events); + + mutex_unlock(&synth_event_mutex); + + list_for_each_entry_safe(event, e, &release_events, list) { + list_del(&event->list); + + ret = unregister_synth_event(event); + add_or_delete_synth_event(event, !ret); + } + + return ret; +} + + +static void *synth_events_seq_start(struct seq_file *m, loff_t *pos) +{ + mutex_lock(&synth_event_mutex); + + return seq_list_start(&synth_event_list, *pos); +} + +static void *synth_events_seq_next(struct seq_file *m, void *v, loff_t *pos) +{ + return seq_list_next(v, &synth_event_list, pos); +} + +static void synth_events_seq_stop(struct seq_file *m, void *v) +{ + mutex_unlock(&synth_event_mutex); +} + +static int synth_events_seq_show(struct seq_file *m, void *v) +{ + struct synth_field *field; + struct synth_event *event = v; + unsigned int i; + + seq_printf(m, "%s\t", event->name); + + for (i = 0; i < event->n_fields; i++) { + field = event->fields[i]; + + /* parameter values */ + seq_printf(m, "%s %s%s", field->type, field->name, + i == event->n_fields - 1 ? "" : "; "); + } + + seq_putc(m, '\n'); + + return 0; +} + +static const struct seq_operations synth_events_seq_op = { + .start = synth_events_seq_start, + .next = synth_events_seq_next, + .stop = synth_events_seq_stop, + .show = synth_events_seq_show +}; + +static int synth_events_open(struct inode *inode, struct file *file) +{ + int ret; + + if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { + ret = release_all_synth_events(); + if (ret < 0) + return ret; + } + + return seq_open(file, &synth_events_seq_op); +} + +static ssize_t synth_events_write(struct file *file, + const char __user *buffer, + size_t count, loff_t *ppos) +{ + return trace_parse_run_command(file, buffer, count, ppos, + create_synth_event); +} + +static const struct file_operations synth_events_fops = { + .open = synth_events_open, + .write = synth_events_write, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static u64 hist_field_timestamp(struct hist_field *hist_field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) +{ + struct hist_trigger_data *hist_data = hist_field->hist_data; + struct trace_array *tr = hist_data->event_file->tr; + + u64 ts = ring_buffer_event_time_stamp(rbe); + + if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr)) + ts = ns2usecs(ts); + + return ts; +} + +static u64 hist_field_cpu(struct hist_field *hist_field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) +{ + int cpu = smp_processor_id(); + + return cpu; +} + +static struct hist_field * +check_field_for_var_ref(struct hist_field *hist_field, + struct hist_trigger_data *var_data, + unsigned int var_idx) +{ + struct hist_field *found = NULL; + + if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF) { + if (hist_field->var.idx == var_idx && + hist_field->var.hist_data == var_data) { + found = hist_field; + } + } + + return found; +} + +static struct hist_field * +check_field_for_var_refs(struct hist_trigger_data *hist_data, + struct hist_field *hist_field, + struct hist_trigger_data *var_data, + unsigned int var_idx, + unsigned int level) +{ + struct hist_field *found = NULL; + unsigned int i; + + if (level > 3) + return found; + + if (!hist_field) + return found; + + found = check_field_for_var_ref(hist_field, var_data, var_idx); + if (found) + return found; + + for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) { + struct hist_field *operand; + + operand = hist_field->operands[i]; + found = check_field_for_var_refs(hist_data, operand, var_data, + var_idx, level + 1); + if (found) + return found; + } + + return found; +} + +static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data, + struct hist_trigger_data *var_data, + unsigned int var_idx) +{ + struct hist_field *hist_field, *found = NULL; + unsigned int i; + + for_each_hist_field(i, hist_data) { + hist_field = hist_data->fields[i]; + found = check_field_for_var_refs(hist_data, hist_field, + var_data, var_idx, 0); + if (found) + return found; + } + + for (i = 0; i < hist_data->n_synth_var_refs; i++) { + hist_field = hist_data->synth_var_refs[i]; + found = check_field_for_var_refs(hist_data, hist_field, + var_data, var_idx, 0); + if (found) + return found; + } + + return found; +} + +static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data, + unsigned int var_idx) +{ + struct trace_array *tr = hist_data->event_file->tr; + struct hist_field *found = NULL; + struct hist_var_data *var_data; + + list_for_each_entry(var_data, &tr->hist_vars, list) { + if (var_data->hist_data == hist_data) + continue; + found = find_var_ref(var_data->hist_data, hist_data, var_idx); + if (found) + break; + } + + return found; +} + +static bool check_var_refs(struct hist_trigger_data *hist_data) +{ + struct hist_field *field; + bool found = false; + int i; + + for_each_hist_field(i, hist_data) { + field = hist_data->fields[i]; + if (field && field->flags & HIST_FIELD_FL_VAR) { + if (find_any_var_ref(hist_data, field->var.idx)) { + found = true; + break; + } + } + } + + return found; +} + +static struct hist_var_data *find_hist_vars(struct hist_trigger_data *hist_data) +{ + struct trace_array *tr = hist_data->event_file->tr; + struct hist_var_data *var_data, *found = NULL; + + list_for_each_entry(var_data, &tr->hist_vars, list) { + if (var_data->hist_data == hist_data) { + found = var_data; + break; + } + } + + return found; +} + +static bool field_has_hist_vars(struct hist_field *hist_field, + unsigned int level) +{ + int i; + + if (level > 3) + return false; + + if (!hist_field) + return false; + + if (hist_field->flags & HIST_FIELD_FL_VAR || + hist_field->flags & HIST_FIELD_FL_VAR_REF) + return true; + + for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) { + struct hist_field *operand; + + operand = hist_field->operands[i]; + if (field_has_hist_vars(operand, level + 1)) + return true; + } + + return false; +} + +static bool has_hist_vars(struct hist_trigger_data *hist_data) +{ + struct hist_field *hist_field; + int i; + + for_each_hist_field(i, hist_data) { + hist_field = hist_data->fields[i]; + if (field_has_hist_vars(hist_field, 0)) + return true; + } + + return false; +} + +static int save_hist_vars(struct hist_trigger_data *hist_data) +{ + struct trace_array *tr = hist_data->event_file->tr; + struct hist_var_data *var_data; + + var_data = find_hist_vars(hist_data); + if (var_data) + return 0; + + if (trace_array_get(tr) < 0) + return -ENODEV; + + var_data = kzalloc(sizeof(*var_data), GFP_KERNEL); + if (!var_data) { + trace_array_put(tr); + return -ENOMEM; + } + + var_data->hist_data = hist_data; + list_add(&var_data->list, &tr->hist_vars); + + return 0; +} + +static void remove_hist_vars(struct hist_trigger_data *hist_data) +{ + struct trace_array *tr = hist_data->event_file->tr; + struct hist_var_data *var_data; + + var_data = find_hist_vars(hist_data); + if (!var_data) + return; + + if (WARN_ON(check_var_refs(hist_data))) + return; + + list_del(&var_data->list); + + kfree(var_data); + + trace_array_put(tr); +} + +static struct hist_field *find_var_field(struct hist_trigger_data *hist_data, + const char *var_name) +{ + struct hist_field *hist_field, *found = NULL; + int i; + + for_each_hist_field(i, hist_data) { + hist_field = hist_data->fields[i]; + if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR && + strcmp(hist_field->var.name, var_name) == 0) { + found = hist_field; + break; + } + } + + return found; +} + +static struct hist_field *find_var(struct hist_trigger_data *hist_data, + struct trace_event_file *file, + const char *var_name) +{ + struct hist_trigger_data *test_data; + struct event_trigger_data *test; + struct hist_field *hist_field; + + hist_field = find_var_field(hist_data, var_name); + if (hist_field) + return hist_field; + + list_for_each_entry_rcu(test, &file->triggers, list) { + if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { + test_data = test->private_data; + hist_field = find_var_field(test_data, var_name); + if (hist_field) + return hist_field; + } + } + + return NULL; +} + +static struct trace_event_file *find_var_file(struct trace_array *tr, + char *system, + char *event_name, + char *var_name) +{ + struct hist_trigger_data *var_hist_data; + struct hist_var_data *var_data; + struct trace_event_file *file, *found = NULL; + + if (system) + return find_event_file(tr, system, event_name); + + list_for_each_entry(var_data, &tr->hist_vars, list) { + var_hist_data = var_data->hist_data; + file = var_hist_data->event_file; + if (file == found) + continue; + + if (find_var_field(var_hist_data, var_name)) { + if (found) { + hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name); + return NULL; + } + + found = file; + } + } + + return found; +} + +static struct hist_field *find_file_var(struct trace_event_file *file, + const char *var_name) +{ + struct hist_trigger_data *test_data; + struct event_trigger_data *test; + struct hist_field *hist_field; + + list_for_each_entry_rcu(test, &file->triggers, list) { + if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { + test_data = test->private_data; + hist_field = find_var_field(test_data, var_name); + if (hist_field) + return hist_field; + } + } + + return NULL; +} + +static struct hist_field * +find_match_var(struct hist_trigger_data *hist_data, char *var_name) +{ + struct trace_array *tr = hist_data->event_file->tr; + struct hist_field *hist_field, *found = NULL; + struct trace_event_file *file; + unsigned int i; + + for (i = 0; i < hist_data->n_actions; i++) { + struct action_data *data = hist_data->actions[i]; + + if (data->fn == action_trace) { + char *system = data->onmatch.match_event_system; + char *event_name = data->onmatch.match_event; + + file = find_var_file(tr, system, event_name, var_name); + if (!file) + continue; + hist_field = find_file_var(file, var_name); + if (hist_field) { + if (found) { + hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name); + return ERR_PTR(-EINVAL); + } + + found = hist_field; + } + } + } + return found; +} + +static struct hist_field *find_event_var(struct hist_trigger_data *hist_data, + char *system, + char *event_name, + char *var_name) +{ + struct trace_array *tr = hist_data->event_file->tr; + struct hist_field *hist_field = NULL; + struct trace_event_file *file; + + if (!system || !event_name) { + hist_field = find_match_var(hist_data, var_name); + if (IS_ERR(hist_field)) + return NULL; + if (hist_field) + return hist_field; + } + + file = find_var_file(tr, system, event_name, var_name); + if (!file) + return NULL; + + hist_field = find_file_var(file, var_name); + + return hist_field; +} + +struct hist_elt_data { + char *comm; + u64 *var_ref_vals; + char *field_var_str[SYNTH_FIELDS_MAX]; +}; + +static u64 hist_field_var_ref(struct hist_field *hist_field, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *event) +{ + struct hist_elt_data *elt_data; + u64 var_val = 0; + + elt_data = elt->private_data; + var_val = elt_data->var_ref_vals[hist_field->var_ref_idx]; + + return var_val; +} + +static bool resolve_var_refs(struct hist_trigger_data *hist_data, void *key, + u64 *var_ref_vals, bool self) +{ + struct hist_trigger_data *var_data; + struct tracing_map_elt *var_elt; + struct hist_field *hist_field; + unsigned int i, var_idx; + bool resolved = true; + u64 var_val = 0; + + for (i = 0; i < hist_data->n_var_refs; i++) { + hist_field = hist_data->var_refs[i]; + var_idx = hist_field->var.idx; + var_data = hist_field->var.hist_data; + + if (var_data == NULL) { + resolved = false; + break; + } + + if ((self && var_data != hist_data) || + (!self && var_data == hist_data)) + continue; + + var_elt = tracing_map_lookup(var_data->map, key); + if (!var_elt) { + resolved = false; + break; + } + + if (!tracing_map_var_set(var_elt, var_idx)) { + resolved = false; + break; + } + + if (self || !hist_field->read_once) + var_val = tracing_map_read_var(var_elt, var_idx); + else + var_val = tracing_map_read_var_once(var_elt, var_idx); + + var_ref_vals[i] = var_val; + } + + return resolved; +} + +static const char *hist_field_name(struct hist_field *field, + unsigned int level) +{ + const char *field_name = ""; + + if (level > 1) + return field_name; + + if (field->field) + field_name = field->field->name; + else if (field->flags & HIST_FIELD_FL_LOG2 || + field->flags & HIST_FIELD_FL_ALIAS) + field_name = hist_field_name(field->operands[0], ++level); + else if (field->flags & HIST_FIELD_FL_TIMESTAMP) + field_name = "common_timestamp"; + else if (field->flags & HIST_FIELD_FL_CPU) + field_name = "cpu"; + else if (field->flags & HIST_FIELD_FL_EXPR || + field->flags & HIST_FIELD_FL_VAR_REF) { + if (field->system) { + static char full_name[MAX_FILTER_STR_VAL]; + + strcat(full_name, field->system); + strcat(full_name, "."); + strcat(full_name, field->event_name); + strcat(full_name, "."); + strcat(full_name, field->name); + field_name = full_name; + } else + field_name = field->name; + } + + if (field_name == NULL) + field_name = ""; + + return field_name; +} + +static hist_field_fn_t select_value_fn(int field_size, int field_is_signed) +{ + hist_field_fn_t fn = NULL; + + switch (field_size) { + case 8: + if (field_is_signed) + fn = hist_field_s64; + else + fn = hist_field_u64; + break; + case 4: + if (field_is_signed) + fn = hist_field_s32; + else + fn = hist_field_u32; + break; + case 2: + if (field_is_signed) + fn = hist_field_s16; + else + fn = hist_field_u16; + break; + case 1: + if (field_is_signed) + fn = hist_field_s8; + else + fn = hist_field_u8; + break; + } + + return fn; +} + +static int parse_map_size(char *str) +{ + unsigned long size, map_bits; + int ret; + + strsep(&str, "="); + if (!str) { + ret = -EINVAL; + goto out; + } + + ret = kstrtoul(str, 0, &size); + if (ret) + goto out; + + map_bits = ilog2(roundup_pow_of_two(size)); + if (map_bits < TRACING_MAP_BITS_MIN || + map_bits > TRACING_MAP_BITS_MAX) + ret = -EINVAL; + else + ret = map_bits; + out: + return ret; +} + +static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs) +{ + unsigned int i; + + if (!attrs) + return; + + for (i = 0; i < attrs->n_assignments; i++) + kfree(attrs->assignment_str[i]); + + for (i = 0; i < attrs->n_actions; i++) + kfree(attrs->action_str[i]); + + kfree(attrs->name); + kfree(attrs->sort_key_str); + kfree(attrs->keys_str); + kfree(attrs->vals_str); + kfree(attrs->clock); + kfree(attrs); +} + +static int parse_action(char *str, struct hist_trigger_attrs *attrs) +{ + int ret = -EINVAL; + + if (attrs->n_actions >= HIST_ACTIONS_MAX) + return ret; + + if ((strncmp(str, "onmatch(", strlen("onmatch(")) == 0) || + (strncmp(str, "onmax(", strlen("onmax(")) == 0)) { + attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL); + if (!attrs->action_str[attrs->n_actions]) { + ret = -ENOMEM; + return ret; + } + attrs->n_actions++; + ret = 0; + } + + return ret; +} + +static int parse_assignment(char *str, struct hist_trigger_attrs *attrs) +{ + int ret = 0; + + if ((strncmp(str, "key=", strlen("key=")) == 0) || + (strncmp(str, "keys=", strlen("keys=")) == 0)) { + attrs->keys_str = kstrdup(str, GFP_KERNEL); + if (!attrs->keys_str) { + ret = -ENOMEM; + goto out; + } + } else if ((strncmp(str, "val=", strlen("val=")) == 0) || + (strncmp(str, "vals=", strlen("vals=")) == 0) || + (strncmp(str, "values=", strlen("values=")) == 0)) { + attrs->vals_str = kstrdup(str, GFP_KERNEL); + if (!attrs->vals_str) { + ret = -ENOMEM; + goto out; + } + } else if (strncmp(str, "sort=", strlen("sort=")) == 0) { + attrs->sort_key_str = kstrdup(str, GFP_KERNEL); + if (!attrs->sort_key_str) { + ret = -ENOMEM; + goto out; + } + } else if (strncmp(str, "name=", strlen("name=")) == 0) { + attrs->name = kstrdup(str, GFP_KERNEL); + if (!attrs->name) { + ret = -ENOMEM; + goto out; + } + } else if (strncmp(str, "clock=", strlen("clock=")) == 0) { + strsep(&str, "="); + if (!str) { + ret = -EINVAL; + goto out; + } + + str = strstrip(str); + attrs->clock = kstrdup(str, GFP_KERNEL); + if (!attrs->clock) { + ret = -ENOMEM; + goto out; + } + } else if (strncmp(str, "size=", strlen("size=")) == 0) { + int map_bits = parse_map_size(str); + + if (map_bits < 0) { + ret = map_bits; + goto out; + } + attrs->map_bits = map_bits; + } else { + char *assignment; + + if (attrs->n_assignments == TRACING_MAP_VARS_MAX) { + hist_err("Too many variables defined: ", str); + ret = -EINVAL; + goto out; + } + + assignment = kstrdup(str, GFP_KERNEL); + if (!assignment) { + ret = -ENOMEM; + goto out; + } + + attrs->assignment_str[attrs->n_assignments++] = assignment; + } + out: + return ret; +} + +static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str) +{ + struct hist_trigger_attrs *attrs; + int ret = 0; + + attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); + if (!attrs) + return ERR_PTR(-ENOMEM); + + while (trigger_str) { + char *str = strsep(&trigger_str, ":"); + + if (strchr(str, '=')) { + ret = parse_assignment(str, attrs); + if (ret) + goto free; + } else if (strcmp(str, "pause") == 0) + attrs->pause = true; + else if ((strcmp(str, "cont") == 0) || + (strcmp(str, "continue") == 0)) + attrs->cont = true; + else if (strcmp(str, "clear") == 0) + attrs->clear = true; + else { + ret = parse_action(str, attrs); + if (ret) + goto free; + } + } + + if (!attrs->keys_str) { + ret = -EINVAL; + goto free; + } + + if (!attrs->clock) { + attrs->clock = kstrdup("global", GFP_KERNEL); + if (!attrs->clock) { + ret = -ENOMEM; + goto free; + } + } + + return attrs; + free: + destroy_hist_trigger_attrs(attrs); + + return ERR_PTR(ret); +} + +static inline void save_comm(char *comm, struct task_struct *task) +{ + if (!task->pid) { + strcpy(comm, ""); + return; + } + + if (WARN_ON_ONCE(task->pid < 0)) { + strcpy(comm, ""); + return; + } + + memcpy(comm, task->comm, TASK_COMM_LEN); +} + +static void hist_elt_data_free(struct hist_elt_data *elt_data) +{ + unsigned int i; + + for (i = 0; i < SYNTH_FIELDS_MAX; i++) + kfree(elt_data->field_var_str[i]); + + kfree(elt_data->comm); + kfree(elt_data); +} + +static void hist_trigger_elt_data_free(struct tracing_map_elt *elt) +{ + struct hist_elt_data *elt_data = elt->private_data; + + hist_elt_data_free(elt_data); +} + +static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt) +{ + struct hist_trigger_data *hist_data = elt->map->private_data; + unsigned int size = TASK_COMM_LEN; + struct hist_elt_data *elt_data; + struct hist_field *key_field; + unsigned int i, n_str; + + elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL); + if (!elt_data) + return -ENOMEM; + + for_each_hist_key_field(i, hist_data) { + key_field = hist_data->fields[i]; + + if (key_field->flags & HIST_FIELD_FL_EXECNAME) { + elt_data->comm = kzalloc(size, GFP_KERNEL); + if (!elt_data->comm) { + kfree(elt_data); + return -ENOMEM; + } + break; + } + } + + n_str = hist_data->n_field_var_str + hist_data->n_max_var_str; + + size = STR_VAR_LEN_MAX; + + for (i = 0; i < n_str; i++) { + elt_data->field_var_str[i] = kzalloc(size, GFP_KERNEL); + if (!elt_data->field_var_str[i]) { + hist_elt_data_free(elt_data); + return -ENOMEM; + } + } + + elt->private_data = elt_data; + + return 0; +} + +static void hist_trigger_elt_data_init(struct tracing_map_elt *elt) +{ + struct hist_elt_data *elt_data = elt->private_data; + + if (elt_data->comm) + save_comm(elt_data->comm, current); +} + +static const struct tracing_map_ops hist_trigger_elt_data_ops = { + .elt_alloc = hist_trigger_elt_data_alloc, + .elt_free = hist_trigger_elt_data_free, + .elt_init = hist_trigger_elt_data_init, +}; + +static const char *get_hist_field_flags(struct hist_field *hist_field) +{ + const char *flags_str = NULL; + + if (hist_field->flags & HIST_FIELD_FL_HEX) + flags_str = "hex"; + else if (hist_field->flags & HIST_FIELD_FL_SYM) + flags_str = "sym"; + else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET) + flags_str = "sym-offset"; + else if (hist_field->flags & HIST_FIELD_FL_EXECNAME) + flags_str = "execname"; + else if (hist_field->flags & HIST_FIELD_FL_SYSCALL) + flags_str = "syscall"; + else if (hist_field->flags & HIST_FIELD_FL_LOG2) + flags_str = "log2"; + else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS) + flags_str = "usecs"; + + return flags_str; +} + +static void expr_field_str(struct hist_field *field, char *expr) +{ + if (field->flags & HIST_FIELD_FL_VAR_REF) + strcat(expr, "$"); + + strcat(expr, hist_field_name(field, 0)); + + if (field->flags) { + const char *flags_str = get_hist_field_flags(field); + + if (flags_str) { + strcat(expr, "."); + strcat(expr, flags_str); + } + } +} + +static char *expr_str(struct hist_field *field, unsigned int level) +{ + char *expr; + + if (level > 1) + return NULL; + + expr = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); + if (!expr) + return NULL; + + if (!field->operands[0]) { + expr_field_str(field, expr); + return expr; + } + + if (field->operator == FIELD_OP_UNARY_MINUS) { + char *subexpr; + + strcat(expr, "-("); + subexpr = expr_str(field->operands[0], ++level); + if (!subexpr) { + kfree(expr); + return NULL; + } + strcat(expr, subexpr); + strcat(expr, ")"); + + kfree(subexpr); + + return expr; + } + + expr_field_str(field->operands[0], expr); + + switch (field->operator) { + case FIELD_OP_MINUS: + strcat(expr, "-"); + break; + case FIELD_OP_PLUS: + strcat(expr, "+"); + break; + default: + kfree(expr); + return NULL; + } + + expr_field_str(field->operands[1], expr); + + return expr; +} + +static int contains_operator(char *str) +{ + enum field_op_id field_op = FIELD_OP_NONE; + char *op; + + op = strpbrk(str, "+-"); + if (!op) + return FIELD_OP_NONE; + + switch (*op) { + case '-': + if (*str == '-') + field_op = FIELD_OP_UNARY_MINUS; + else + field_op = FIELD_OP_MINUS; + break; + case '+': + field_op = FIELD_OP_PLUS; + break; + default: + break; + } + + return field_op; +} + +static void destroy_hist_field(struct hist_field *hist_field, + unsigned int level) +{ + unsigned int i; + + if (level > 3) + return; + + if (!hist_field) + return; + + for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) + destroy_hist_field(hist_field->operands[i], level + 1); + + kfree(hist_field->var.name); + kfree(hist_field->name); + kfree(hist_field->type); + + kfree(hist_field); +} + +static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data, + struct ftrace_event_field *field, + unsigned long flags, + char *var_name) +{ + struct hist_field *hist_field; + + if (field && is_function_field(field)) + return NULL; + + hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL); + if (!hist_field) + return NULL; + + hist_field->hist_data = hist_data; + + if (flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS) + goto out; /* caller will populate */ + + if (flags & HIST_FIELD_FL_VAR_REF) { + hist_field->fn = hist_field_var_ref; + goto out; + } + + if (flags & HIST_FIELD_FL_HITCOUNT) { + hist_field->fn = hist_field_counter; + hist_field->size = sizeof(u64); + hist_field->type = kstrdup("u64", GFP_KERNEL); + if (!hist_field->type) + goto free; + goto out; + } + + if (flags & HIST_FIELD_FL_STACKTRACE) { + hist_field->fn = hist_field_none; + goto out; + } + + if (flags & HIST_FIELD_FL_LOG2) { + unsigned long fl = flags & ~HIST_FIELD_FL_LOG2; + hist_field->fn = hist_field_log2; + hist_field->operands[0] = create_hist_field(hist_data, field, fl, NULL); + hist_field->size = hist_field->operands[0]->size; + hist_field->type = kstrdup(hist_field->operands[0]->type, GFP_KERNEL); + if (!hist_field->type) + goto free; + goto out; + } + + if (flags & HIST_FIELD_FL_TIMESTAMP) { + hist_field->fn = hist_field_timestamp; + hist_field->size = sizeof(u64); + hist_field->type = kstrdup("u64", GFP_KERNEL); + if (!hist_field->type) + goto free; + goto out; + } + + if (flags & HIST_FIELD_FL_CPU) { + hist_field->fn = hist_field_cpu; + hist_field->size = sizeof(int); + hist_field->type = kstrdup("unsigned int", GFP_KERNEL); + if (!hist_field->type) + goto free; + goto out; + } + + if (WARN_ON_ONCE(!field)) + goto out; + + if (is_string_field(field)) { + flags |= HIST_FIELD_FL_STRING; + + hist_field->size = MAX_FILTER_STR_VAL; + hist_field->type = kstrdup(field->type, GFP_KERNEL); + if (!hist_field->type) + goto free; + + if (field->filter_type == FILTER_STATIC_STRING) + hist_field->fn = hist_field_string; + else if (field->filter_type == FILTER_DYN_STRING) + hist_field->fn = hist_field_dynstring; + else + hist_field->fn = hist_field_pstring; + } else { + hist_field->size = field->size; + hist_field->is_signed = field->is_signed; + hist_field->type = kstrdup(field->type, GFP_KERNEL); + if (!hist_field->type) + goto free; + + hist_field->fn = select_value_fn(field->size, + field->is_signed); + if (!hist_field->fn) { + destroy_hist_field(hist_field, 0); + return NULL; + } + } + out: + hist_field->field = field; + hist_field->flags = flags; + + if (var_name) { + hist_field->var.name = kstrdup(var_name, GFP_KERNEL); + if (!hist_field->var.name) + goto free; + } + + return hist_field; + free: + destroy_hist_field(hist_field, 0); + return NULL; +} + +static void destroy_hist_fields(struct hist_trigger_data *hist_data) +{ + unsigned int i; + + for (i = 0; i < HIST_FIELDS_MAX; i++) { + if (hist_data->fields[i]) { + destroy_hist_field(hist_data->fields[i], 0); + hist_data->fields[i] = NULL; + } + } +} + +static int init_var_ref(struct hist_field *ref_field, + struct hist_field *var_field, + char *system, char *event_name) +{ + int err = 0; + + ref_field->var.idx = var_field->var.idx; + ref_field->var.hist_data = var_field->hist_data; + ref_field->size = var_field->size; + ref_field->is_signed = var_field->is_signed; + ref_field->flags |= var_field->flags & + (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); + + if (system) { + ref_field->system = kstrdup(system, GFP_KERNEL); + if (!ref_field->system) + return -ENOMEM; + } + + if (event_name) { + ref_field->event_name = kstrdup(event_name, GFP_KERNEL); + if (!ref_field->event_name) { + err = -ENOMEM; + goto free; + } + } + + if (var_field->var.name) { + ref_field->name = kstrdup(var_field->var.name, GFP_KERNEL); + if (!ref_field->name) { + err = -ENOMEM; + goto free; + } + } else if (var_field->name) { + ref_field->name = kstrdup(var_field->name, GFP_KERNEL); + if (!ref_field->name) { + err = -ENOMEM; + goto free; + } + } + + ref_field->type = kstrdup(var_field->type, GFP_KERNEL); + if (!ref_field->type) { + err = -ENOMEM; + goto free; + } + out: + return err; + free: + kfree(ref_field->system); + kfree(ref_field->event_name); + kfree(ref_field->name); + + goto out; +} + +static struct hist_field *create_var_ref(struct hist_field *var_field, + char *system, char *event_name) +{ + unsigned long flags = HIST_FIELD_FL_VAR_REF; + struct hist_field *ref_field; + + ref_field = create_hist_field(var_field->hist_data, NULL, flags, NULL); + if (ref_field) { + if (init_var_ref(ref_field, var_field, system, event_name)) { + destroy_hist_field(ref_field, 0); + return NULL; + } + } + + return ref_field; +} + +static bool is_var_ref(char *var_name) +{ + if (!var_name || strlen(var_name) < 2 || var_name[0] != '$') + return false; + + return true; +} + +static char *field_name_from_var(struct hist_trigger_data *hist_data, + char *var_name) +{ + char *name, *field; + unsigned int i; + + for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { + name = hist_data->attrs->var_defs.name[i]; + + if (strcmp(var_name, name) == 0) { + field = hist_data->attrs->var_defs.expr[i]; + if (contains_operator(field) || is_var_ref(field)) + continue; + return field; + } + } + + return NULL; +} + +static char *local_field_var_ref(struct hist_trigger_data *hist_data, + char *system, char *event_name, + char *var_name) +{ + struct trace_event_call *call; + + if (system && event_name) { + call = hist_data->event_file->event_call; + + if (strcmp(system, call->class->system) != 0) + return NULL; + + if (strcmp(event_name, trace_event_name(call)) != 0) + return NULL; + } + + if (!!system != !!event_name) + return NULL; + + if (!is_var_ref(var_name)) + return NULL; + + var_name++; + + return field_name_from_var(hist_data, var_name); +} + +static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data, + char *system, char *event_name, + char *var_name) +{ + struct hist_field *var_field = NULL, *ref_field = NULL; + + if (!is_var_ref(var_name)) + return NULL; + + var_name++; + + var_field = find_event_var(hist_data, system, event_name, var_name); + if (var_field) + ref_field = create_var_ref(var_field, system, event_name); + + if (!ref_field) + hist_err_event("Couldn't find variable: $", + system, event_name, var_name); + + return ref_field; +} + +static struct ftrace_event_field * +parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file, + char *field_str, unsigned long *flags) +{ + struct ftrace_event_field *field = NULL; + char *field_name, *modifier, *str; + + modifier = str = kstrdup(field_str, GFP_KERNEL); + if (!modifier) + return ERR_PTR(-ENOMEM); + + field_name = strsep(&modifier, "."); + if (modifier) { + if (strcmp(modifier, "hex") == 0) + *flags |= HIST_FIELD_FL_HEX; + else if (strcmp(modifier, "sym") == 0) + *flags |= HIST_FIELD_FL_SYM; + else if (strcmp(modifier, "sym-offset") == 0) + *flags |= HIST_FIELD_FL_SYM_OFFSET; + else if ((strcmp(modifier, "execname") == 0) && + (strcmp(field_name, "common_pid") == 0)) + *flags |= HIST_FIELD_FL_EXECNAME; + else if (strcmp(modifier, "syscall") == 0) + *flags |= HIST_FIELD_FL_SYSCALL; + else if (strcmp(modifier, "log2") == 0) + *flags |= HIST_FIELD_FL_LOG2; + else if (strcmp(modifier, "usecs") == 0) + *flags |= HIST_FIELD_FL_TIMESTAMP_USECS; + else { + field = ERR_PTR(-EINVAL); + goto out; + } + } + + if (strcmp(field_name, "common_timestamp") == 0) { + *flags |= HIST_FIELD_FL_TIMESTAMP; + hist_data->enable_timestamps = true; + if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS) + hist_data->attrs->ts_in_usecs = true; + } else if (strcmp(field_name, "cpu") == 0) + *flags |= HIST_FIELD_FL_CPU; + else { + field = trace_find_event_field(file->event_call, field_name); + if (!field || !field->size) { + field = ERR_PTR(-EINVAL); + goto out; + } + } + out: + kfree(str); + + return field; +} + +static struct hist_field *create_alias(struct hist_trigger_data *hist_data, + struct hist_field *var_ref, + char *var_name) +{ + struct hist_field *alias = NULL; + unsigned long flags = HIST_FIELD_FL_ALIAS | HIST_FIELD_FL_VAR; + + alias = create_hist_field(hist_data, NULL, flags, var_name); + if (!alias) + return NULL; + + alias->fn = var_ref->fn; + alias->operands[0] = var_ref; + + if (init_var_ref(alias, var_ref, var_ref->system, var_ref->event_name)) { + destroy_hist_field(alias, 0); + return NULL; + } + + return alias; +} + +static struct hist_field *parse_atom(struct hist_trigger_data *hist_data, + struct trace_event_file *file, char *str, + unsigned long *flags, char *var_name) +{ + char *s, *ref_system = NULL, *ref_event = NULL, *ref_var = str; + struct ftrace_event_field *field = NULL; + struct hist_field *hist_field = NULL; + int ret = 0; + + s = strchr(str, '.'); + if (s) { + s = strchr(++s, '.'); + if (s) { + ref_system = strsep(&str, "."); + if (!str) { + ret = -EINVAL; + goto out; + } + ref_event = strsep(&str, "."); + if (!str) { + ret = -EINVAL; + goto out; + } + ref_var = str; + } + } + + s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var); + if (!s) { + hist_field = parse_var_ref(hist_data, ref_system, ref_event, ref_var); + if (hist_field) { + hist_data->var_refs[hist_data->n_var_refs] = hist_field; + hist_field->var_ref_idx = hist_data->n_var_refs++; + if (var_name) { + hist_field = create_alias(hist_data, hist_field, var_name); + if (!hist_field) { + ret = -ENOMEM; + goto out; + } + } + return hist_field; + } + } else + str = s; + + field = parse_field(hist_data, file, str, flags); + if (IS_ERR(field)) { + ret = PTR_ERR(field); + goto out; + } + + hist_field = create_hist_field(hist_data, field, *flags, var_name); + if (!hist_field) { + ret = -ENOMEM; + goto out; + } + + return hist_field; + out: + return ERR_PTR(ret); +} + +static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, + struct trace_event_file *file, + char *str, unsigned long flags, + char *var_name, unsigned int level); + +static struct hist_field *parse_unary(struct hist_trigger_data *hist_data, + struct trace_event_file *file, + char *str, unsigned long flags, + char *var_name, unsigned int level) +{ + struct hist_field *operand1, *expr = NULL; + unsigned long operand_flags; + int ret = 0; + char *s; + + // we support only -(xxx) i.e. explicit parens required + + if (level > 3) { + hist_err("Too many subexpressions (3 max): ", str); + ret = -EINVAL; + goto free; + } + + str++; // skip leading '-' + + s = strchr(str, '('); + if (s) + str++; + else { + ret = -EINVAL; + goto free; + } + + s = strrchr(str, ')'); + if (s) + *s = '\0'; + else { + ret = -EINVAL; // no closing ')' + goto free; + } + + flags |= HIST_FIELD_FL_EXPR; + expr = create_hist_field(hist_data, NULL, flags, var_name); + if (!expr) { + ret = -ENOMEM; + goto free; + } + + operand_flags = 0; + operand1 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level); + if (IS_ERR(operand1)) { + ret = PTR_ERR(operand1); + goto free; + } + + expr->flags |= operand1->flags & + (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); + expr->fn = hist_field_unary_minus; + expr->operands[0] = operand1; + expr->operator = FIELD_OP_UNARY_MINUS; + expr->name = expr_str(expr, 0); + expr->type = kstrdup(operand1->type, GFP_KERNEL); + if (!expr->type) { + ret = -ENOMEM; + goto free; + } + + return expr; + free: + destroy_hist_field(expr, 0); + return ERR_PTR(ret); +} + +static int check_expr_operands(struct hist_field *operand1, + struct hist_field *operand2) +{ + unsigned long operand1_flags = operand1->flags; + unsigned long operand2_flags = operand2->flags; + + if ((operand1_flags & HIST_FIELD_FL_VAR_REF) || + (operand1_flags & HIST_FIELD_FL_ALIAS)) { + struct hist_field *var; + + var = find_var_field(operand1->var.hist_data, operand1->name); + if (!var) + return -EINVAL; + operand1_flags = var->flags; + } + + if ((operand2_flags & HIST_FIELD_FL_VAR_REF) || + (operand2_flags & HIST_FIELD_FL_ALIAS)) { + struct hist_field *var; + + var = find_var_field(operand2->var.hist_data, operand2->name); + if (!var) + return -EINVAL; + operand2_flags = var->flags; + } + + if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) != + (operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) { + hist_err("Timestamp units in expression don't match", NULL); + return -EINVAL; + } + + return 0; +} + +static struct hist_field *parse_expr(struct hist_trigger_data *hist_data, + struct trace_event_file *file, + char *str, unsigned long flags, + char *var_name, unsigned int level) +{ + struct hist_field *operand1 = NULL, *operand2 = NULL, *expr = NULL; + unsigned long operand_flags; + int field_op, ret = -EINVAL; + char *sep, *operand1_str; + + if (level > 3) { + hist_err("Too many subexpressions (3 max): ", str); + return ERR_PTR(-EINVAL); + } + + field_op = contains_operator(str); + + if (field_op == FIELD_OP_NONE) + return parse_atom(hist_data, file, str, &flags, var_name); + + if (field_op == FIELD_OP_UNARY_MINUS) + return parse_unary(hist_data, file, str, flags, var_name, ++level); + + switch (field_op) { + case FIELD_OP_MINUS: + sep = "-"; + break; + case FIELD_OP_PLUS: + sep = "+"; + break; + default: + goto free; + } + + operand1_str = strsep(&str, sep); + if (!operand1_str || !str) + goto free; + + operand_flags = 0; + operand1 = parse_atom(hist_data, file, operand1_str, + &operand_flags, NULL); + if (IS_ERR(operand1)) { + ret = PTR_ERR(operand1); + operand1 = NULL; + goto free; + } + + // rest of string could be another expression e.g. b+c in a+b+c + operand_flags = 0; + operand2 = parse_expr(hist_data, file, str, operand_flags, NULL, ++level); + if (IS_ERR(operand2)) { + ret = PTR_ERR(operand2); + operand2 = NULL; + goto free; + } + + ret = check_expr_operands(operand1, operand2); + if (ret) + goto free; + + flags |= HIST_FIELD_FL_EXPR; + + flags |= operand1->flags & + (HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS); + + expr = create_hist_field(hist_data, NULL, flags, var_name); + if (!expr) { + ret = -ENOMEM; + goto free; + } + + operand1->read_once = true; + operand2->read_once = true; + + expr->operands[0] = operand1; + expr->operands[1] = operand2; + expr->operator = field_op; + expr->name = expr_str(expr, 0); + expr->type = kstrdup(operand1->type, GFP_KERNEL); + if (!expr->type) { + ret = -ENOMEM; + goto free; + } + + switch (field_op) { + case FIELD_OP_MINUS: + expr->fn = hist_field_minus; + break; + case FIELD_OP_PLUS: + expr->fn = hist_field_plus; + break; + default: + goto free; + } + + return expr; + free: + destroy_hist_field(operand1, 0); + destroy_hist_field(operand2, 0); + destroy_hist_field(expr, 0); + + return ERR_PTR(ret); +} + +static char *find_trigger_filter(struct hist_trigger_data *hist_data, + struct trace_event_file *file) +{ + struct event_trigger_data *test; + + list_for_each_entry_rcu(test, &file->triggers, list) { + if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { + if (test->private_data == hist_data) + return test->filter_str; + } + } + + return NULL; +} + +static struct event_command trigger_hist_cmd; +static int event_hist_trigger_func(struct event_command *cmd_ops, + struct trace_event_file *file, + char *glob, char *cmd, char *param); + +static bool compatible_keys(struct hist_trigger_data *target_hist_data, + struct hist_trigger_data *hist_data, + unsigned int n_keys) +{ + struct hist_field *target_hist_field, *hist_field; + unsigned int n, i, j; + + if (hist_data->n_fields - hist_data->n_vals != n_keys) + return false; + + i = hist_data->n_vals; + j = target_hist_data->n_vals; + + for (n = 0; n < n_keys; n++) { + hist_field = hist_data->fields[i + n]; + target_hist_field = target_hist_data->fields[j + n]; + + if (strcmp(hist_field->type, target_hist_field->type) != 0) + return false; + if (hist_field->size != target_hist_field->size) + return false; + if (hist_field->is_signed != target_hist_field->is_signed) + return false; + } + + return true; +} + +static struct hist_trigger_data * +find_compatible_hist(struct hist_trigger_data *target_hist_data, + struct trace_event_file *file) +{ + struct hist_trigger_data *hist_data; + struct event_trigger_data *test; + unsigned int n_keys; + + n_keys = target_hist_data->n_fields - target_hist_data->n_vals; + + list_for_each_entry_rcu(test, &file->triggers, list) { + if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) { + hist_data = test->private_data; + + if (compatible_keys(target_hist_data, hist_data, n_keys)) + return hist_data; + } + } + + return NULL; +} + +static struct trace_event_file *event_file(struct trace_array *tr, + char *system, char *event_name) +{ + struct trace_event_file *file; + + file = find_event_file(tr, system, event_name); + if (!file) + return ERR_PTR(-EINVAL); + + return file; +} + +static struct hist_field * +find_synthetic_field_var(struct hist_trigger_data *target_hist_data, + char *system, char *event_name, char *field_name) +{ + struct hist_field *event_var; + char *synthetic_name; + + synthetic_name = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); + if (!synthetic_name) + return ERR_PTR(-ENOMEM); + + strcpy(synthetic_name, "synthetic_"); + strcat(synthetic_name, field_name); + + event_var = find_event_var(target_hist_data, system, event_name, synthetic_name); + + kfree(synthetic_name); + + return event_var; +} + +/** + * create_field_var_hist - Automatically create a histogram and var for a field + * @target_hist_data: The target hist trigger + * @subsys_name: Optional subsystem name + * @event_name: Optional event name + * @field_name: The name of the field (and the resulting variable) + * + * Hist trigger actions fetch data from variables, not directly from + * events. However, for convenience, users are allowed to directly + * specify an event field in an action, which will be automatically + * converted into a variable on their behalf. + + * If a user specifies a field on an event that isn't the event the + * histogram currently being defined (the target event histogram), the + * only way that can be accomplished is if a new hist trigger is + * created and the field variable defined on that. + * + * This function creates a new histogram compatible with the target + * event (meaning a histogram with the same key as the target + * histogram), and creates a variable for the specified field, but + * with 'synthetic_' prepended to the variable name in order to avoid + * collision with normal field variables. + * + * Return: The variable created for the field. + */ +static struct hist_field * +create_field_var_hist(struct hist_trigger_data *target_hist_data, + char *subsys_name, char *event_name, char *field_name) +{ + struct trace_array *tr = target_hist_data->event_file->tr; + struct hist_field *event_var = ERR_PTR(-EINVAL); + struct hist_trigger_data *hist_data; + unsigned int i, n, first = true; + struct field_var_hist *var_hist; + struct trace_event_file *file; + struct hist_field *key_field; + char *saved_filter; + char *cmd; + int ret; + + if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) { + hist_err_event("onmatch: Too many field variables defined: ", + subsys_name, event_name, field_name); + return ERR_PTR(-EINVAL); + } + + file = event_file(tr, subsys_name, event_name); + + if (IS_ERR(file)) { + hist_err_event("onmatch: Event file not found: ", + subsys_name, event_name, field_name); + ret = PTR_ERR(file); + return ERR_PTR(ret); + } + + /* + * Look for a histogram compatible with target. We'll use the + * found histogram specification to create a new matching + * histogram with our variable on it. target_hist_data is not + * yet a registered histogram so we can't use that. + */ + hist_data = find_compatible_hist(target_hist_data, file); + if (!hist_data) { + hist_err_event("onmatch: Matching event histogram not found: ", + subsys_name, event_name, field_name); + return ERR_PTR(-EINVAL); + } + + /* See if a synthetic field variable has already been created */ + event_var = find_synthetic_field_var(target_hist_data, subsys_name, + event_name, field_name); + if (!IS_ERR_OR_NULL(event_var)) + return event_var; + + var_hist = kzalloc(sizeof(*var_hist), GFP_KERNEL); + if (!var_hist) + return ERR_PTR(-ENOMEM); + + cmd = kzalloc(MAX_FILTER_STR_VAL, GFP_KERNEL); + if (!cmd) { + kfree(var_hist); + return ERR_PTR(-ENOMEM); + } + + /* Use the same keys as the compatible histogram */ + strcat(cmd, "keys="); + + for_each_hist_key_field(i, hist_data) { + key_field = hist_data->fields[i]; + if (!first) + strcat(cmd, ","); + strcat(cmd, key_field->field->name); + first = false; + } + + /* Create the synthetic field variable specification */ + strcat(cmd, ":synthetic_"); + strcat(cmd, field_name); + strcat(cmd, "="); + strcat(cmd, field_name); + + /* Use the same filter as the compatible histogram */ + saved_filter = find_trigger_filter(hist_data, file); + if (saved_filter) { + strcat(cmd, " if "); + strcat(cmd, saved_filter); + } + + var_hist->cmd = kstrdup(cmd, GFP_KERNEL); + if (!var_hist->cmd) { + kfree(cmd); + kfree(var_hist); + return ERR_PTR(-ENOMEM); + } + + /* Save the compatible histogram information */ + var_hist->hist_data = hist_data; + + /* Create the new histogram with our variable */ + ret = event_hist_trigger_func(&trigger_hist_cmd, file, + "", "hist", cmd); + if (ret) { + kfree(cmd); + kfree(var_hist->cmd); + kfree(var_hist); + hist_err_event("onmatch: Couldn't create histogram for field: ", + subsys_name, event_name, field_name); + return ERR_PTR(ret); + } + + kfree(cmd); + + /* If we can't find the variable, something went wrong */ + event_var = find_synthetic_field_var(target_hist_data, subsys_name, + event_name, field_name); + if (IS_ERR_OR_NULL(event_var)) { + kfree(var_hist->cmd); + kfree(var_hist); + hist_err_event("onmatch: Couldn't find synthetic variable: ", + subsys_name, event_name, field_name); + return ERR_PTR(-EINVAL); + } + + n = target_hist_data->n_field_var_hists; + target_hist_data->field_var_hists[n] = var_hist; + target_hist_data->n_field_var_hists++; + + return event_var; +} + +static struct hist_field * +find_target_event_var(struct hist_trigger_data *hist_data, + char *subsys_name, char *event_name, char *var_name) +{ + struct trace_event_file *file = hist_data->event_file; + struct hist_field *hist_field = NULL; + + if (subsys_name) { + struct trace_event_call *call; + + if (!event_name) + return NULL; + + call = file->event_call; + + if (strcmp(subsys_name, call->class->system) != 0) + return NULL; + + if (strcmp(event_name, trace_event_name(call)) != 0) + return NULL; + } + + hist_field = find_var_field(hist_data, var_name); + + return hist_field; +} + +static inline void __update_field_vars(struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *rec, + struct field_var **field_vars, + unsigned int n_field_vars, + unsigned int field_var_str_start) +{ + struct hist_elt_data *elt_data = elt->private_data; + unsigned int i, j, var_idx; + u64 var_val; + + for (i = 0, j = field_var_str_start; i < n_field_vars; i++) { + struct field_var *field_var = field_vars[i]; + struct hist_field *var = field_var->var; + struct hist_field *val = field_var->val; + + var_val = val->fn(val, elt, rbe, rec); + var_idx = var->var.idx; + + if (val->flags & HIST_FIELD_FL_STRING) { + char *str = elt_data->field_var_str[j++]; + char *val_str = (char *)(uintptr_t)var_val; + + strncpy(str, val_str, STR_VAR_LEN_MAX); + var_val = (u64)(uintptr_t)str; + } + tracing_map_set_var(elt, var_idx, var_val); + } +} + +static void update_field_vars(struct hist_trigger_data *hist_data, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *rec) +{ + __update_field_vars(elt, rbe, rec, hist_data->field_vars, + hist_data->n_field_vars, 0); +} + +static void update_max_vars(struct hist_trigger_data *hist_data, + struct tracing_map_elt *elt, + struct ring_buffer_event *rbe, + void *rec) +{ + __update_field_vars(elt, rbe, rec, hist_data->max_vars, + hist_data->n_max_vars, hist_data->n_field_var_str); +} + +static struct hist_field *create_var(struct hist_trigger_data *hist_data, + struct trace_event_file *file, + char *name, int size, const char *type) +{ + struct hist_field *var; + int idx; + + if (find_var(hist_data, file, name) && !hist_data->remove) { + var = ERR_PTR(-EINVAL); + goto out; + } + + var = kzalloc(sizeof(struct hist_field), GFP_KERNEL); + if (!var) { + var = ERR_PTR(-ENOMEM); + goto out; + } + + idx = tracing_map_add_var(hist_data->map); + if (idx < 0) { + kfree(var); + var = ERR_PTR(-EINVAL); + goto out; + } + + var->flags = HIST_FIELD_FL_VAR; + var->var.idx = idx; + var->var.hist_data = var->hist_data = hist_data; + var->size = size; + var->var.name = kstrdup(name, GFP_KERNEL); + var->type = kstrdup(type, GFP_KERNEL); + if (!var->var.name || !var->type) { + kfree(var->var.name); + kfree(var->type); + kfree(var); + var = ERR_PTR(-ENOMEM); + } + out: + return var; +} + +static struct field_var *create_field_var(struct hist_trigger_data *hist_data, + struct trace_event_file *file, + char *field_name) +{ + struct hist_field *val = NULL, *var = NULL; + unsigned long flags = HIST_FIELD_FL_VAR; + struct field_var *field_var; + int ret = 0; + + if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) { + hist_err("Too many field variables defined: ", field_name); + ret = -EINVAL; + goto err; + } + + val = parse_atom(hist_data, file, field_name, &flags, NULL); + if (IS_ERR(val)) { + hist_err("Couldn't parse field variable: ", field_name); + ret = PTR_ERR(val); + goto err; + } + + var = create_var(hist_data, file, field_name, val->size, val->type); + if (IS_ERR(var)) { + hist_err("Couldn't create or find variable: ", field_name); + kfree(val); + ret = PTR_ERR(var); + goto err; + } + + field_var = kzalloc(sizeof(struct field_var), GFP_KERNEL); + if (!field_var) { + kfree(val); + kfree(var); + ret = -ENOMEM; + goto err; + } + + field_var->var = var; + field_var->val = val; + out: + return field_var; + err: + field_var = ERR_PTR(ret); + goto out; +} + +/** + * create_target_field_var - Automatically create a variable for a field + * @target_hist_data: The target hist trigger + * @subsys_name: Optional subsystem name + * @event_name: Optional event name + * @var_name: The name of the field (and the resulting variable) + * + * Hist trigger actions fetch data from variables, not directly from + * events. However, for convenience, users are allowed to directly + * specify an event field in an action, which will be automatically + * converted into a variable on their behalf. + + * This function creates a field variable with the name var_name on + * the hist trigger currently being defined on the target event. If + * subsys_name and event_name are specified, this function simply + * verifies that they do in fact match the target event subsystem and + * event name. + * + * Return: The variable created for the field. + */ +static struct field_var * +create_target_field_var(struct hist_trigger_data *target_hist_data, + char *subsys_name, char *event_name, char *var_name) +{ + struct trace_event_file *file = target_hist_data->event_file; + + if (subsys_name) { + struct trace_event_call *call; + + if (!event_name) + return NULL; + + call = file->event_call; + + if (strcmp(subsys_name, call->class->system) != 0) + return NULL; + + if (strcmp(event_name, trace_event_name(call)) != 0) + return NULL; + } + + return create_field_var(target_hist_data, file, var_name); +} + +static void onmax_print(struct seq_file *m, + struct hist_trigger_data *hist_data, + struct tracing_map_elt *elt, + struct action_data *data) +{ + unsigned int i, save_var_idx, max_idx = data->onmax.max_var->var.idx; + + seq_printf(m, "\n\tmax: %10llu", tracing_map_read_var(elt, max_idx)); + + for (i = 0; i < hist_data->n_max_vars; i++) { + struct hist_field *save_val = hist_data->max_vars[i]->val; + struct hist_field *save_var = hist_data->max_vars[i]->var; + u64 val; + + save_var_idx = save_var->var.idx; + + val = tracing_map_read_var(elt, save_var_idx); + + if (save_val->flags & HIST_FIELD_FL_STRING) { + seq_printf(m, " %s: %-32s", save_var->var.name, + (char *)(uintptr_t)(val)); + } else + seq_printf(m, " %s: %10llu", save_var->var.name, val); + } +} + +static void onmax_save(struct hist_trigger_data *hist_data, + struct tracing_map_elt *elt, void *rec, + struct ring_buffer_event *rbe, + struct action_data *data, u64 *var_ref_vals) +{ + unsigned int max_idx = data->onmax.max_var->var.idx; + unsigned int max_var_ref_idx = data->onmax.max_var_ref_idx; + + u64 var_val, max_val; + + var_val = var_ref_vals[max_var_ref_idx]; + max_val = tracing_map_read_var(elt, max_idx); + + if (var_val <= max_val) + return; + + tracing_map_set_var(elt, max_idx, var_val); + + update_max_vars(hist_data, elt, rbe, rec); +} + +static void onmax_destroy(struct action_data *data) +{ + unsigned int i; + + destroy_hist_field(data->onmax.max_var, 0); + destroy_hist_field(data->onmax.var, 0); + + kfree(data->onmax.var_str); + kfree(data->onmax.fn_name); + + for (i = 0; i < data->n_params; i++) + kfree(data->params[i]); + + kfree(data); +} + +static int onmax_create(struct hist_trigger_data *hist_data, + struct action_data *data) +{ + struct trace_event_file *file = hist_data->event_file; + struct hist_field *var_field, *ref_field, *max_var; + unsigned int var_ref_idx = hist_data->n_var_refs; + struct field_var *field_var; + char *onmax_var_str, *param; + unsigned long flags; + unsigned int i; + int ret = 0; + + onmax_var_str = data->onmax.var_str; + if (onmax_var_str[0] != '$') { + hist_err("onmax: For onmax(x), x must be a variable: ", onmax_var_str); + return -EINVAL; + } + onmax_var_str++; + + var_field = find_target_event_var(hist_data, NULL, NULL, onmax_var_str); + if (!var_field) { + hist_err("onmax: Couldn't find onmax variable: ", onmax_var_str); + return -EINVAL; + } + + flags = HIST_FIELD_FL_VAR_REF; + ref_field = create_hist_field(hist_data, NULL, flags, NULL); + if (!ref_field) + return -ENOMEM; + + if (init_var_ref(ref_field, var_field, NULL, NULL)) { + destroy_hist_field(ref_field, 0); + ret = -ENOMEM; + goto out; + } + hist_data->var_refs[hist_data->n_var_refs] = ref_field; + ref_field->var_ref_idx = hist_data->n_var_refs++; + data->onmax.var = ref_field; + + data->fn = onmax_save; + data->onmax.max_var_ref_idx = var_ref_idx; + max_var = create_var(hist_data, file, "max", sizeof(u64), "u64"); + if (IS_ERR(max_var)) { + hist_err("onmax: Couldn't create onmax variable: ", "max"); + ret = PTR_ERR(max_var); + goto out; + } + data->onmax.max_var = max_var; + + for (i = 0; i < data->n_params; i++) { + param = kstrdup(data->params[i], GFP_KERNEL); + if (!param) { + ret = -ENOMEM; + goto out; + } + + field_var = create_target_field_var(hist_data, NULL, NULL, param); + if (IS_ERR(field_var)) { + hist_err("onmax: Couldn't create field variable: ", param); + ret = PTR_ERR(field_var); + kfree(param); + goto out; + } + + hist_data->max_vars[hist_data->n_max_vars++] = field_var; + if (field_var->val->flags & HIST_FIELD_FL_STRING) + hist_data->n_max_var_str++; + + kfree(param); + } + out: + return ret; +} + +static int parse_action_params(char *params, struct action_data *data) +{ + char *param, *saved_param; + int ret = 0; + + while (params) { + if (data->n_params >= SYNTH_FIELDS_MAX) + goto out; + + param = strsep(¶ms, ","); + if (!param) { + ret = -EINVAL; + goto out; + } + + param = strstrip(param); + if (strlen(param) < 2) { + hist_err("Invalid action param: ", param); + ret = -EINVAL; + goto out; + } + + saved_param = kstrdup(param, GFP_KERNEL); + if (!saved_param) { + ret = -ENOMEM; + goto out; + } + + data->params[data->n_params++] = saved_param; + } + out: + return ret; +} + +static struct action_data *onmax_parse(char *str) +{ + char *onmax_fn_name, *onmax_var_str; + struct action_data *data; + int ret = -EINVAL; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return ERR_PTR(-ENOMEM); + + onmax_var_str = strsep(&str, ")"); + if (!onmax_var_str || !str) { + ret = -EINVAL; + goto free; + } + + data->onmax.var_str = kstrdup(onmax_var_str, GFP_KERNEL); + if (!data->onmax.var_str) { + ret = -ENOMEM; + goto free; + } + + strsep(&str, "."); + if (!str) + goto free; + + onmax_fn_name = strsep(&str, "("); + if (!onmax_fn_name || !str) + goto free; + + if (strncmp(onmax_fn_name, "save", strlen("save")) == 0) { + char *params = strsep(&str, ")"); + + if (!params) { + ret = -EINVAL; + goto free; + } + + ret = parse_action_params(params, data); + if (ret) + goto free; + } else + goto free; + + data->onmax.fn_name = kstrdup(onmax_fn_name, GFP_KERNEL); + if (!data->onmax.fn_name) { + ret = -ENOMEM; + goto free; + } + out: + return data; + free: + onmax_destroy(data); + data = ERR_PTR(ret); + goto out; +} + +static void onmatch_destroy(struct action_data *data) +{ + unsigned int i; + + mutex_lock(&synth_event_mutex); + + kfree(data->onmatch.match_event); + kfree(data->onmatch.match_event_system); + kfree(data->onmatch.synth_event_name); + + for (i = 0; i < data->n_params; i++) + kfree(data->params[i]); + + if (data->onmatch.synth_event) + data->onmatch.synth_event->ref--; + + kfree(data); + + mutex_unlock(&synth_event_mutex); +} + +static void destroy_field_var(struct field_var *field_var) +{ + if (!field_var) + return; + + destroy_hist_field(field_var->var, 0); + destroy_hist_field(field_var->val, 0); + + kfree(field_var); +} + +static void destroy_field_vars(struct hist_trigger_data *hist_data) +{ + unsigned int i; + + for (i = 0; i < hist_data->n_field_vars; i++) + destroy_field_var(hist_data->field_vars[i]); +} + +static void save_field_var(struct hist_trigger_data *hist_data, + struct field_var *field_var) +{ + hist_data->field_vars[hist_data->n_field_vars++] = field_var; + + if (field_var->val->flags & HIST_FIELD_FL_STRING) + hist_data->n_field_var_str++; +} + + +static void destroy_synth_var_refs(struct hist_trigger_data *hist_data) +{ + unsigned int i; + + for (i = 0; i < hist_data->n_synth_var_refs; i++) + destroy_hist_field(hist_data->synth_var_refs[i], 0); +} + +static void save_synth_var_ref(struct hist_trigger_data *hist_data, + struct hist_field *var_ref) +{ + hist_data->synth_var_refs[hist_data->n_synth_var_refs++] = var_ref; + + hist_data->var_refs[hist_data->n_var_refs] = var_ref; + var_ref->var_ref_idx = hist_data->n_var_refs++; +} + +static int check_synth_field(struct synth_event *event, + struct hist_field *hist_field, + unsigned int field_pos) +{ + struct synth_field *field; + + if (field_pos >= event->n_fields) + return -EINVAL; + + field = event->fields[field_pos]; + + if (strcmp(field->type, hist_field->type) != 0) + return -EINVAL; + + return 0; +} + +static struct hist_field * +onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data, + char *system, char *event, char *var) +{ + struct hist_field *hist_field; + + var++; /* skip '$' */ + + hist_field = find_target_event_var(hist_data, system, event, var); + if (!hist_field) { + if (!system) { + system = data->onmatch.match_event_system; + event = data->onmatch.match_event; + } + + hist_field = find_event_var(hist_data, system, event, var); + } + + if (!hist_field) + hist_err_event("onmatch: Couldn't find onmatch param: $", system, event, var); + + return hist_field; +} + +static struct hist_field * +onmatch_create_field_var(struct hist_trigger_data *hist_data, + struct action_data *data, char *system, + char *event, char *var) +{ + struct hist_field *hist_field = NULL; + struct field_var *field_var; + + /* + * First try to create a field var on the target event (the + * currently being defined). This will create a variable for + * unqualified fields on the target event, or if qualified, + * target fields that have qualified names matching the target. + */ + field_var = create_target_field_var(hist_data, system, event, var); + + if (field_var && !IS_ERR(field_var)) { + save_field_var(hist_data, field_var); + hist_field = field_var->var; + } else { + field_var = NULL; + /* + * If no explicit system.event is specfied, default to + * looking for fields on the onmatch(system.event.xxx) + * event. + */ + if (!system) { + system = data->onmatch.match_event_system; + event = data->onmatch.match_event; + } + + /* + * At this point, we're looking at a field on another + * event. Because we can't modify a hist trigger on + * another event to add a variable for a field, we need + * to create a new trigger on that event and create the + * variable at the same time. + */ + hist_field = create_field_var_hist(hist_data, system, event, var); + if (IS_ERR(hist_field)) + goto free; + } + out: + return hist_field; + free: + destroy_field_var(field_var); + hist_field = NULL; + goto out; +} + +static int onmatch_create(struct hist_trigger_data *hist_data, + struct trace_event_file *file, + struct action_data *data) +{ + char *event_name, *param, *system = NULL; + struct hist_field *hist_field, *var_ref; + unsigned int i, var_ref_idx; + unsigned int field_pos = 0; + struct synth_event *event; + int ret = 0; + + mutex_lock(&synth_event_mutex); + event = find_synth_event(data->onmatch.synth_event_name); + if (!event) { + hist_err("onmatch: Couldn't find synthetic event: ", data->onmatch.synth_event_name); + mutex_unlock(&synth_event_mutex); + return -EINVAL; + } + event->ref++; + mutex_unlock(&synth_event_mutex); + + var_ref_idx = hist_data->n_var_refs; + + for (i = 0; i < data->n_params; i++) { + char *p; + + p = param = kstrdup(data->params[i], GFP_KERNEL); + if (!param) { + ret = -ENOMEM; + goto err; + } + + system = strsep(¶m, "."); + if (!param) { + param = (char *)system; + system = event_name = NULL; + } else { + event_name = strsep(¶m, "."); + if (!param) { + kfree(p); + ret = -EINVAL; + goto err; + } + } + + if (param[0] == '$') + hist_field = onmatch_find_var(hist_data, data, system, + event_name, param); + else + hist_field = onmatch_create_field_var(hist_data, data, + system, + event_name, + param); + + if (!hist_field) { + kfree(p); + ret = -EINVAL; + goto err; + } + + if (check_synth_field(event, hist_field, field_pos) == 0) { + var_ref = create_var_ref(hist_field, system, event_name); + if (!var_ref) { + kfree(p); + ret = -ENOMEM; + goto err; + } + + save_synth_var_ref(hist_data, var_ref); + field_pos++; + kfree(p); + continue; + } + + hist_err_event("onmatch: Param type doesn't match synthetic event field type: ", + system, event_name, param); + kfree(p); + ret = -EINVAL; + goto err; + } + + if (field_pos != event->n_fields) { + hist_err("onmatch: Param count doesn't match synthetic event field count: ", event->name); + ret = -EINVAL; + goto err; + } + + data->fn = action_trace; + data->onmatch.synth_event = event; + data->onmatch.var_ref_idx = var_ref_idx; + out: + return ret; + err: + mutex_lock(&synth_event_mutex); + event->ref--; + mutex_unlock(&synth_event_mutex); + + goto out; +} + +static struct action_data *onmatch_parse(struct trace_array *tr, char *str) +{ + char *match_event, *match_event_system; + char *synth_event_name, *params; + struct action_data *data; + int ret = -EINVAL; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return ERR_PTR(-ENOMEM); + + match_event = strsep(&str, ")"); + if (!match_event || !str) { + hist_err("onmatch: Missing closing paren: ", match_event); + goto free; + } + + match_event_system = strsep(&match_event, "."); + if (!match_event) { + hist_err("onmatch: Missing subsystem for match event: ", match_event_system); + goto free; + } + + if (IS_ERR(event_file(tr, match_event_system, match_event))) { + hist_err_event("onmatch: Invalid subsystem or event name: ", + match_event_system, match_event, NULL); + goto free; + } + + data->onmatch.match_event = kstrdup(match_event, GFP_KERNEL); + if (!data->onmatch.match_event) { + ret = -ENOMEM; + goto free; + } - if (is_string_field(field)) { - flags |= HIST_FIELD_FL_STRING; + data->onmatch.match_event_system = kstrdup(match_event_system, GFP_KERNEL); + if (!data->onmatch.match_event_system) { + ret = -ENOMEM; + goto free; + } - if (field->filter_type == FILTER_STATIC_STRING) - hist_field->fn = hist_field_string; - else if (field->filter_type == FILTER_DYN_STRING) - hist_field->fn = hist_field_dynstring; - else - hist_field->fn = hist_field_pstring; - } else { - hist_field->fn = select_value_fn(field->size, - field->is_signed); - if (!hist_field->fn) { - destroy_hist_field(hist_field); - return NULL; - } + strsep(&str, "."); + if (!str) { + hist_err("onmatch: Missing . after onmatch(): ", str); + goto free; } - out: - hist_field->field = field; - hist_field->flags = flags; - return hist_field; -} + synth_event_name = strsep(&str, "("); + if (!synth_event_name || !str) { + hist_err("onmatch: Missing opening paramlist paren: ", synth_event_name); + goto free; + } -static void destroy_hist_fields(struct hist_trigger_data *hist_data) -{ - unsigned int i; + data->onmatch.synth_event_name = kstrdup(synth_event_name, GFP_KERNEL); + if (!data->onmatch.synth_event_name) { + ret = -ENOMEM; + goto free; + } - for (i = 0; i < TRACING_MAP_FIELDS_MAX; i++) { - if (hist_data->fields[i]) { - destroy_hist_field(hist_data->fields[i]); - hist_data->fields[i] = NULL; - } + params = strsep(&str, ")"); + if (!params || !str || (str && strlen(str))) { + hist_err("onmatch: Missing closing paramlist paren: ", params); + goto free; } + + ret = parse_action_params(params, data); + if (ret) + goto free; + out: + return data; + free: + onmatch_destroy(data); + data = ERR_PTR(ret); + goto out; } static int create_hitcount_val(struct hist_trigger_data *hist_data) { hist_data->fields[HITCOUNT_IDX] = - create_hist_field(NULL, HIST_FIELD_FL_HITCOUNT); + create_hist_field(hist_data, NULL, HIST_FIELD_FL_HITCOUNT, NULL); if (!hist_data->fields[HITCOUNT_IDX]) return -ENOMEM; hist_data->n_vals++; + hist_data->n_fields++; if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX)) return -EINVAL; @@ -426,54 +3826,71 @@ static int create_hitcount_val(struct hi return 0; } +static int __create_val_field(struct hist_trigger_data *hist_data, + unsigned int val_idx, + struct trace_event_file *file, + char *var_name, char *field_str, + unsigned long flags) +{ + struct hist_field *hist_field; + int ret = 0; + + hist_field = parse_expr(hist_data, file, field_str, flags, var_name, 0); + if (IS_ERR(hist_field)) { + ret = PTR_ERR(hist_field); + goto out; + } + + hist_data->fields[val_idx] = hist_field; + + ++hist_data->n_vals; + ++hist_data->n_fields; + + if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) + ret = -EINVAL; + out: + return ret; +} + static int create_val_field(struct hist_trigger_data *hist_data, unsigned int val_idx, struct trace_event_file *file, char *field_str) { - struct ftrace_event_field *field = NULL; - unsigned long flags = 0; - char *field_name; - int ret = 0; - if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX)) return -EINVAL; - field_name = strsep(&field_str, "."); - if (field_str) { - if (strcmp(field_str, "hex") == 0) - flags |= HIST_FIELD_FL_HEX; - else { - ret = -EINVAL; - goto out; - } - } + return __create_val_field(hist_data, val_idx, file, NULL, field_str, 0); +} - field = trace_find_event_field(file->event_call, field_name); - if (!field || !field->size) { - ret = -EINVAL; - goto out; - } +static int create_var_field(struct hist_trigger_data *hist_data, + unsigned int val_idx, + struct trace_event_file *file, + char *var_name, char *expr_str) +{ + unsigned long flags = 0; - hist_data->fields[val_idx] = create_hist_field(field, flags); - if (!hist_data->fields[val_idx]) { - ret = -ENOMEM; - goto out; + if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX)) + return -EINVAL; + + if (find_var(hist_data, file, var_name) && !hist_data->remove) { + hist_err("Variable already defined: ", var_name); + return -EINVAL; } - ++hist_data->n_vals; + flags |= HIST_FIELD_FL_VAR; + hist_data->n_vars++; + if (WARN_ON(hist_data->n_vars > TRACING_MAP_VARS_MAX)) + return -EINVAL; - if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX)) - ret = -EINVAL; - out: - return ret; + return __create_val_field(hist_data, val_idx, file, var_name, expr_str, flags); } static int create_val_fields(struct hist_trigger_data *hist_data, struct trace_event_file *file) { char *fields_str, *field_str; - unsigned int i, j; + unsigned int i, j = 1; int ret; ret = create_hitcount_val(hist_data); @@ -493,12 +3910,15 @@ static int create_val_fields(struct hist field_str = strsep(&fields_str, ","); if (!field_str) break; + if (strcmp(field_str, "hitcount") == 0) continue; + ret = create_val_field(hist_data, j++, file, field_str); if (ret) goto out; } + if (fields_str && (strcmp(fields_str, "hitcount") != 0)) ret = -EINVAL; out: @@ -511,12 +3931,13 @@ static int create_key_field(struct hist_ struct trace_event_file *file, char *field_str) { - struct ftrace_event_field *field = NULL; + struct hist_field *hist_field = NULL; + unsigned long flags = 0; unsigned int key_size; int ret = 0; - if (WARN_ON(key_idx >= TRACING_MAP_FIELDS_MAX)) + if (WARN_ON(key_idx >= HIST_FIELDS_MAX)) return -EINVAL; flags |= HIST_FIELD_FL_KEY; @@ -524,57 +3945,40 @@ static int create_key_field(struct hist_ if (strcmp(field_str, "stacktrace") == 0) { flags |= HIST_FIELD_FL_STACKTRACE; key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH; + hist_field = create_hist_field(hist_data, NULL, flags, NULL); } else { - char *field_name = strsep(&field_str, "."); - - if (field_str) { - if (strcmp(field_str, "hex") == 0) - flags |= HIST_FIELD_FL_HEX; - else if (strcmp(field_str, "sym") == 0) - flags |= HIST_FIELD_FL_SYM; - else if (strcmp(field_str, "sym-offset") == 0) - flags |= HIST_FIELD_FL_SYM_OFFSET; - else if ((strcmp(field_str, "execname") == 0) && - (strcmp(field_name, "common_pid") == 0)) - flags |= HIST_FIELD_FL_EXECNAME; - else if (strcmp(field_str, "syscall") == 0) - flags |= HIST_FIELD_FL_SYSCALL; - else if (strcmp(field_str, "log2") == 0) - flags |= HIST_FIELD_FL_LOG2; - else { - ret = -EINVAL; - goto out; - } + hist_field = parse_expr(hist_data, file, field_str, flags, + NULL, 0); + if (IS_ERR(hist_field)) { + ret = PTR_ERR(hist_field); + goto out; } - field = trace_find_event_field(file->event_call, field_name); - if (!field || !field->size) { + if (hist_field->flags & HIST_FIELD_FL_VAR_REF) { + hist_err("Using variable references as keys not supported: ", field_str); + destroy_hist_field(hist_field, 0); ret = -EINVAL; goto out; } - if (is_string_field(field)) - key_size = MAX_FILTER_STR_VAL; - else - key_size = field->size; + key_size = hist_field->size; } - hist_data->fields[key_idx] = create_hist_field(field, flags); - if (!hist_data->fields[key_idx]) { - ret = -ENOMEM; - goto out; - } + hist_data->fields[key_idx] = hist_field; key_size = ALIGN(key_size, sizeof(u64)); hist_data->fields[key_idx]->size = key_size; hist_data->fields[key_idx]->offset = key_offset; + hist_data->key_size += key_size; + if (hist_data->key_size > HIST_KEY_SIZE_MAX) { ret = -EINVAL; goto out; } hist_data->n_keys++; + hist_data->n_fields++; if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX)) return -EINVAL; @@ -618,21 +4022,113 @@ static int create_key_fields(struct hist return ret; } +static int create_var_fields(struct hist_trigger_data *hist_data, + struct trace_event_file *file) +{ + unsigned int i, j = hist_data->n_vals; + int ret = 0; + + unsigned int n_vars = hist_data->attrs->var_defs.n_vars; + + for (i = 0; i < n_vars; i++) { + char *var_name = hist_data->attrs->var_defs.name[i]; + char *expr = hist_data->attrs->var_defs.expr[i]; + + ret = create_var_field(hist_data, j++, file, var_name, expr); + if (ret) + goto out; + } + out: + return ret; +} + +static void free_var_defs(struct hist_trigger_data *hist_data) +{ + unsigned int i; + + for (i = 0; i < hist_data->attrs->var_defs.n_vars; i++) { + kfree(hist_data->attrs->var_defs.name[i]); + kfree(hist_data->attrs->var_defs.expr[i]); + } + + hist_data->attrs->var_defs.n_vars = 0; +} + +static int parse_var_defs(struct hist_trigger_data *hist_data) +{ + char *s, *str, *var_name, *field_str; + unsigned int i, j, n_vars = 0; + int ret = 0; + + for (i = 0; i < hist_data->attrs->n_assignments; i++) { + str = hist_data->attrs->assignment_str[i]; + for (j = 0; j < TRACING_MAP_VARS_MAX; j++) { + field_str = strsep(&str, ","); + if (!field_str) + break; + + var_name = strsep(&field_str, "="); + if (!var_name || !field_str) { + hist_err("Malformed assignment: ", var_name); + ret = -EINVAL; + goto free; + } + + if (n_vars == TRACING_MAP_VARS_MAX) { + hist_err("Too many variables defined: ", var_name); + ret = -EINVAL; + goto free; + } + + s = kstrdup(var_name, GFP_KERNEL); + if (!s) { + ret = -ENOMEM; + goto free; + } + hist_data->attrs->var_defs.name[n_vars] = s; + + s = kstrdup(field_str, GFP_KERNEL); + if (!s) { + kfree(hist_data->attrs->var_defs.name[n_vars]); + ret = -ENOMEM; + goto free; + } + hist_data->attrs->var_defs.expr[n_vars++] = s; + + hist_data->attrs->var_defs.n_vars = n_vars; + } + } + + return ret; + free: + free_var_defs(hist_data); + + return ret; +} + static int create_hist_fields(struct hist_trigger_data *hist_data, struct trace_event_file *file) { int ret; + ret = parse_var_defs(hist_data); + if (ret) + goto out; + ret = create_val_fields(hist_data, file); if (ret) goto out; - ret = create_key_fields(hist_data, file); + ret = create_var_fields(hist_data, file); if (ret) goto out; - hist_data->n_fields = hist_data->n_vals + hist_data->n_keys; + ret = create_key_fields(hist_data, file); + if (ret) + goto out; out: + free_var_defs(hist_data); + return ret; } @@ -653,10 +4149,9 @@ static int is_descending(const char *str static int create_sort_keys(struct hist_trigger_data *hist_data) { char *fields_str = hist_data->attrs->sort_key_str; - struct ftrace_event_field *field = NULL; struct tracing_map_sort_key *sort_key; int descending, ret = 0; - unsigned int i, j; + unsigned int i, j, k; hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */ @@ -670,7 +4165,9 @@ static int create_sort_keys(struct hist_ } for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) { + struct hist_field *hist_field; char *field_str, *field_name; + const char *test_name; sort_key = &hist_data->sort_keys[i]; @@ -702,34 +4199,210 @@ static int create_sort_keys(struct hist_ continue; } - for (j = 1; j < hist_data->n_fields; j++) { - field = hist_data->fields[j]->field; - if (field && (strcmp(field_name, field->name) == 0)) { - sort_key->field_idx = j; - descending = is_descending(field_str); - if (descending < 0) { - ret = descending; - goto out; - } - sort_key->descending = descending; - break; - } - } - if (j == hist_data->n_fields) { - ret = -EINVAL; - break; - } + for (j = 1, k = 1; j < hist_data->n_fields; j++) { + unsigned int idx; + + hist_field = hist_data->fields[j]; + if (hist_field->flags & HIST_FIELD_FL_VAR) + continue; + + idx = k++; + + test_name = hist_field_name(hist_field, 0); + + if (strcmp(field_name, test_name) == 0) { + sort_key->field_idx = idx; + descending = is_descending(field_str); + if (descending < 0) { + ret = descending; + goto out; + } + sort_key->descending = descending; + break; + } + } + if (j == hist_data->n_fields) { + ret = -EINVAL; + break; + } + } + + hist_data->n_sort_keys = i; + out: + return ret; +} + +static void destroy_actions(struct hist_trigger_data *hist_data) +{ + unsigned int i; + + for (i = 0; i < hist_data->n_actions; i++) { + struct action_data *data = hist_data->actions[i]; + + if (data->fn == action_trace) + onmatch_destroy(data); + else if (data->fn == onmax_save) + onmax_destroy(data); + else + kfree(data); + } +} + +static int parse_actions(struct hist_trigger_data *hist_data) +{ + struct trace_array *tr = hist_data->event_file->tr; + struct action_data *data; + unsigned int i; + int ret = 0; + char *str; + + for (i = 0; i < hist_data->attrs->n_actions; i++) { + str = hist_data->attrs->action_str[i]; + + if (strncmp(str, "onmatch(", strlen("onmatch(")) == 0) { + char *action_str = str + strlen("onmatch("); + + data = onmatch_parse(tr, action_str); + if (IS_ERR(data)) { + ret = PTR_ERR(data); + break; + } + data->fn = action_trace; + } else if (strncmp(str, "onmax(", strlen("onmax(")) == 0) { + char *action_str = str + strlen("onmax("); + + data = onmax_parse(action_str); + if (IS_ERR(data)) { + ret = PTR_ERR(data); + break; + } + data->fn = onmax_save; + } else { + ret = -EINVAL; + break; + } + + hist_data->actions[hist_data->n_actions++] = data; + } + + return ret; +} + +static int create_actions(struct hist_trigger_data *hist_data, + struct trace_event_file *file) +{ + struct action_data *data; + unsigned int i; + int ret = 0; + + for (i = 0; i < hist_data->attrs->n_actions; i++) { + data = hist_data->actions[i]; + + if (data->fn == action_trace) { + ret = onmatch_create(hist_data, file, data); + if (ret) + return ret; + } else if (data->fn == onmax_save) { + ret = onmax_create(hist_data, data); + if (ret) + return ret; + } + } + + return ret; +} + +static void print_actions(struct seq_file *m, + struct hist_trigger_data *hist_data, + struct tracing_map_elt *elt) +{ + unsigned int i; + + for (i = 0; i < hist_data->n_actions; i++) { + struct action_data *data = hist_data->actions[i]; + + if (data->fn == onmax_save) + onmax_print(m, hist_data, elt, data); + } +} + +static void print_onmax_spec(struct seq_file *m, + struct hist_trigger_data *hist_data, + struct action_data *data) +{ + unsigned int i; + + seq_puts(m, ":onmax("); + seq_printf(m, "%s", data->onmax.var_str); + seq_printf(m, ").%s(", data->onmax.fn_name); + + for (i = 0; i < hist_data->n_max_vars; i++) { + seq_printf(m, "%s", hist_data->max_vars[i]->var->var.name); + if (i < hist_data->n_max_vars - 1) + seq_puts(m, ","); + } + seq_puts(m, ")"); +} + +static void print_onmatch_spec(struct seq_file *m, + struct hist_trigger_data *hist_data, + struct action_data *data) +{ + unsigned int i; + + seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system, + data->onmatch.match_event); + + seq_printf(m, "%s(", data->onmatch.synth_event->name); + + for (i = 0; i < data->n_params; i++) { + if (i) + seq_puts(m, ","); + seq_printf(m, "%s", data->params[i]); + } + + seq_puts(m, ")"); +} + +static void print_actions_spec(struct seq_file *m, + struct hist_trigger_data *hist_data) +{ + unsigned int i; + + for (i = 0; i < hist_data->n_actions; i++) { + struct action_data *data = hist_data->actions[i]; + + if (data->fn == action_trace) + print_onmatch_spec(m, hist_data, data); + else if (data->fn == onmax_save) + print_onmax_spec(m, hist_data, data); + } +} + +static void destroy_field_var_hists(struct hist_trigger_data *hist_data) +{ + unsigned int i; + + for (i = 0; i < hist_data->n_field_var_hists; i++) { + kfree(hist_data->field_var_hists[i]->cmd); + kfree(hist_data->field_var_hists[i]); } - hist_data->n_sort_keys = i; - out: - return ret; } static void destroy_hist_data(struct hist_trigger_data *hist_data) { + if (!hist_data) + return; + destroy_hist_trigger_attrs(hist_data->attrs); destroy_hist_fields(hist_data); tracing_map_destroy(hist_data->map); + + destroy_actions(hist_data); + destroy_field_vars(hist_data); + destroy_field_var_hists(hist_data); + destroy_synth_var_refs(hist_data); + kfree(hist_data); } @@ -749,6 +4422,9 @@ static int create_tracing_map_fields(str if (hist_field->flags & HIST_FIELD_FL_STACKTRACE) cmp_fn = tracing_map_cmp_none; + else if (!field) + cmp_fn = tracing_map_cmp_num(hist_field->size, + hist_field->is_signed); else if (is_string_field(field)) cmp_fn = tracing_map_cmp_string; else @@ -757,36 +4433,29 @@ static int create_tracing_map_fields(str idx = tracing_map_add_key_field(map, hist_field->offset, cmp_fn); - - } else + } else if (!(hist_field->flags & HIST_FIELD_FL_VAR)) idx = tracing_map_add_sum_field(map); if (idx < 0) return idx; - } - - return 0; -} - -static bool need_tracing_map_ops(struct hist_trigger_data *hist_data) -{ - struct hist_field *key_field; - unsigned int i; - - for_each_hist_key_field(i, hist_data) { - key_field = hist_data->fields[i]; - if (key_field->flags & HIST_FIELD_FL_EXECNAME) - return true; + if (hist_field->flags & HIST_FIELD_FL_VAR) { + idx = tracing_map_add_var(map); + if (idx < 0) + return idx; + hist_field->var.idx = idx; + hist_field->var.hist_data = hist_data; + } } - return false; + return 0; } static struct hist_trigger_data * create_hist_data(unsigned int map_bits, struct hist_trigger_attrs *attrs, - struct trace_event_file *file) + struct trace_event_file *file, + bool remove) { const struct tracing_map_ops *map_ops = NULL; struct hist_trigger_data *hist_data; @@ -797,6 +4466,12 @@ create_hist_data(unsigned int map_bits, return ERR_PTR(-ENOMEM); hist_data->attrs = attrs; + hist_data->remove = remove; + hist_data->event_file = file; + + ret = parse_actions(hist_data); + if (ret) + goto free; ret = create_hist_fields(hist_data, file); if (ret) @@ -806,8 +4481,7 @@ create_hist_data(unsigned int map_bits, if (ret) goto free; - if (need_tracing_map_ops(hist_data)) - map_ops = &hist_trigger_elt_comm_ops; + map_ops = &hist_trigger_elt_data_ops; hist_data->map = tracing_map_create(map_bits, hist_data->key_size, map_ops, hist_data); @@ -820,12 +4494,6 @@ create_hist_data(unsigned int map_bits, ret = create_tracing_map_fields(hist_data); if (ret) goto free; - - ret = tracing_map_init(hist_data->map); - if (ret) - goto free; - - hist_data->event_file = file; out: return hist_data; free: @@ -839,18 +4507,39 @@ create_hist_data(unsigned int map_bits, } static void hist_trigger_elt_update(struct hist_trigger_data *hist_data, - struct tracing_map_elt *elt, - void *rec) + struct tracing_map_elt *elt, void *rec, + struct ring_buffer_event *rbe, + u64 *var_ref_vals) { + struct hist_elt_data *elt_data; struct hist_field *hist_field; - unsigned int i; + unsigned int i, var_idx; u64 hist_val; + elt_data = elt->private_data; + elt_data->var_ref_vals = var_ref_vals; + for_each_hist_val_field(i, hist_data) { hist_field = hist_data->fields[i]; - hist_val = hist_field->fn(hist_field, rec); + hist_val = hist_field->fn(hist_field, elt, rbe, rec); + if (hist_field->flags & HIST_FIELD_FL_VAR) { + var_idx = hist_field->var.idx; + tracing_map_set_var(elt, var_idx, hist_val); + continue; + } tracing_map_update_sum(elt, i, hist_val); } + + for_each_hist_key_field(i, hist_data) { + hist_field = hist_data->fields[i]; + if (hist_field->flags & HIST_FIELD_FL_VAR) { + hist_val = hist_field->fn(hist_field, elt, rbe, rec); + var_idx = hist_field->var.idx; + tracing_map_set_var(elt, var_idx, hist_val); + } + } + + update_field_vars(hist_data, elt, rbe, rec); } static inline void add_to_key(char *compound_key, void *key, @@ -877,15 +4566,31 @@ static inline void add_to_key(char *comp memcpy(compound_key + key_field->offset, key, size); } -static void event_hist_trigger(struct event_trigger_data *data, void *rec) +static void +hist_trigger_actions(struct hist_trigger_data *hist_data, + struct tracing_map_elt *elt, void *rec, + struct ring_buffer_event *rbe, u64 *var_ref_vals) +{ + struct action_data *data; + unsigned int i; + + for (i = 0; i < hist_data->n_actions; i++) { + data = hist_data->actions[i]; + data->fn(hist_data, elt, rec, rbe, data, var_ref_vals); + } +} + +static void event_hist_trigger(struct event_trigger_data *data, void *rec, + struct ring_buffer_event *rbe) { struct hist_trigger_data *hist_data = data->private_data; bool use_compound_key = (hist_data->n_keys > 1); unsigned long entries[HIST_STACKTRACE_DEPTH]; + u64 var_ref_vals[TRACING_MAP_VARS_MAX]; char compound_key[HIST_KEY_SIZE_MAX]; + struct tracing_map_elt *elt = NULL; struct stack_trace stacktrace; struct hist_field *key_field; - struct tracing_map_elt *elt; u64 field_contents; void *key = NULL; unsigned int i; @@ -906,7 +4611,7 @@ static void event_hist_trigger(struct ev key = entries; } else { - field_contents = key_field->fn(key_field, rec); + field_contents = key_field->fn(key_field, elt, rbe, rec); if (key_field->flags & HIST_FIELD_FL_STRING) { key = (void *)(unsigned long)field_contents; use_compound_key = true; @@ -921,9 +4626,18 @@ static void event_hist_trigger(struct ev if (use_compound_key) key = compound_key; + if (hist_data->n_var_refs && + !resolve_var_refs(hist_data, key, var_ref_vals, false)) + return; + elt = tracing_map_insert(hist_data->map, key); - if (elt) - hist_trigger_elt_update(hist_data, elt, rec); + if (!elt) + return; + + hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals); + + if (resolve_var_refs(hist_data, key, var_ref_vals, true)) + hist_trigger_actions(hist_data, elt, rec, rbe, var_ref_vals); } static void hist_trigger_stacktrace_print(struct seq_file *m, @@ -952,6 +4666,7 @@ hist_trigger_entry_print(struct seq_file struct hist_field *key_field; char str[KSYM_SYMBOL_LEN]; bool multiline = false; + const char *field_name; unsigned int i; u64 uval; @@ -963,26 +4678,33 @@ hist_trigger_entry_print(struct seq_file if (i > hist_data->n_vals) seq_puts(m, ", "); + field_name = hist_field_name(key_field, 0); + if (key_field->flags & HIST_FIELD_FL_HEX) { uval = *(u64 *)(key + key_field->offset); - seq_printf(m, "%s: %llx", - key_field->field->name, uval); + seq_printf(m, "%s: %llx", field_name, uval); } else if (key_field->flags & HIST_FIELD_FL_SYM) { uval = *(u64 *)(key + key_field->offset); sprint_symbol_no_offset(str, uval); - seq_printf(m, "%s: [%llx] %-45s", - key_field->field->name, uval, str); + seq_printf(m, "%s: [%llx] %-45s", field_name, + uval, str); } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) { uval = *(u64 *)(key + key_field->offset); sprint_symbol(str, uval); - seq_printf(m, "%s: [%llx] %-55s", - key_field->field->name, uval, str); + seq_printf(m, "%s: [%llx] %-55s", field_name, + uval, str); } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) { - char *comm = elt->private_data; + struct hist_elt_data *elt_data = elt->private_data; + char *comm; + + if (WARN_ON_ONCE(!elt_data)) + return; + + comm = elt_data->comm; uval = *(u64 *)(key + key_field->offset); - seq_printf(m, "%s: %-16s[%10llu]", - key_field->field->name, comm, uval); + seq_printf(m, "%s: %-16s[%10llu]", field_name, + comm, uval); } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) { const char *syscall_name; @@ -991,8 +4713,8 @@ hist_trigger_entry_print(struct seq_file if (!syscall_name) syscall_name = "unknown_syscall"; - seq_printf(m, "%s: %-30s[%3llu]", - key_field->field->name, syscall_name, uval); + seq_printf(m, "%s: %-30s[%3llu]", field_name, + syscall_name, uval); } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { seq_puts(m, "stacktrace:\n"); hist_trigger_stacktrace_print(m, @@ -1000,15 +4722,14 @@ hist_trigger_entry_print(struct seq_file HIST_STACKTRACE_DEPTH); multiline = true; } else if (key_field->flags & HIST_FIELD_FL_LOG2) { - seq_printf(m, "%s: ~ 2^%-2llu", key_field->field->name, + seq_printf(m, "%s: ~ 2^%-2llu", field_name, *(u64 *)(key + key_field->offset)); } else if (key_field->flags & HIST_FIELD_FL_STRING) { - seq_printf(m, "%s: %-50s", key_field->field->name, + seq_printf(m, "%s: %-50s", field_name, (char *)(key + key_field->offset)); } else { uval = *(u64 *)(key + key_field->offset); - seq_printf(m, "%s: %10llu", key_field->field->name, - uval); + seq_printf(m, "%s: %10llu", field_name, uval); } } @@ -1021,17 +4742,23 @@ hist_trigger_entry_print(struct seq_file tracing_map_read_sum(elt, HITCOUNT_IDX)); for (i = 1; i < hist_data->n_vals; i++) { + field_name = hist_field_name(hist_data->fields[i], 0); + + if (hist_data->fields[i]->flags & HIST_FIELD_FL_VAR || + hist_data->fields[i]->flags & HIST_FIELD_FL_EXPR) + continue; + if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) { - seq_printf(m, " %s: %10llx", - hist_data->fields[i]->field->name, + seq_printf(m, " %s: %10llx", field_name, tracing_map_read_sum(elt, i)); } else { - seq_printf(m, " %s: %10llu", - hist_data->fields[i]->field->name, + seq_printf(m, " %s: %10llu", field_name, tracing_map_read_sum(elt, i)); } } + print_actions(m, hist_data, elt); + seq_puts(m, "\n"); } @@ -1102,6 +4829,11 @@ static int hist_show(struct seq_file *m, hist_trigger_show(m, data, n++); } + if (have_hist_err()) { + seq_printf(m, "\nERROR: %s\n", hist_err_str); + seq_printf(m, " Last command: %s\n", last_hist_cmd); + } + out_unlock: mutex_unlock(&event_mutex); @@ -1120,29 +4852,24 @@ const struct file_operations event_hist_ .release = single_release, }; -static const char *get_hist_field_flags(struct hist_field *hist_field) +static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) { - const char *flags_str = NULL; + const char *field_name = hist_field_name(hist_field, 0); - if (hist_field->flags & HIST_FIELD_FL_HEX) - flags_str = "hex"; - else if (hist_field->flags & HIST_FIELD_FL_SYM) - flags_str = "sym"; - else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET) - flags_str = "sym-offset"; - else if (hist_field->flags & HIST_FIELD_FL_EXECNAME) - flags_str = "execname"; - else if (hist_field->flags & HIST_FIELD_FL_SYSCALL) - flags_str = "syscall"; - else if (hist_field->flags & HIST_FIELD_FL_LOG2) - flags_str = "log2"; + if (hist_field->var.name) + seq_printf(m, "%s=", hist_field->var.name); - return flags_str; -} + if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP) + seq_puts(m, "common_timestamp"); + else if (hist_field->flags & HIST_FIELD_FL_CPU) + seq_puts(m, "cpu"); + else if (field_name) { + if (hist_field->flags & HIST_FIELD_FL_VAR_REF || + hist_field->flags & HIST_FIELD_FL_ALIAS) + seq_putc(m, '$'); + seq_printf(m, "%s", field_name); + } -static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) -{ - seq_printf(m, "%s", hist_field->field->name); if (hist_field->flags) { const char *flags_str = get_hist_field_flags(hist_field); @@ -1156,7 +4883,8 @@ static int event_hist_trigger_print(stru struct event_trigger_data *data) { struct hist_trigger_data *hist_data = data->private