--- Documentation/hwlat_detector.txt | 64 Documentation/sysrq.txt | 11 Documentation/trace/histograms.txt | 186 ++ arch/Kconfig | 1 arch/alpha/mm/fault.c | 2 arch/arm/Kconfig | 1 arch/arm/include/asm/cmpxchg.h | 2 arch/arm/include/asm/futex.h | 4 arch/arm/include/asm/switch_to.h | 8 arch/arm/include/asm/thread_info.h | 3 arch/arm/kernel/asm-offsets.c | 1 arch/arm/kernel/entry-armv.S | 13 arch/arm/kernel/process.c | 24 arch/arm/kernel/signal.c | 3 arch/arm/kernel/unwind.c | 14 arch/arm/kvm/arm.c | 4 arch/arm/kvm/psci.c | 4 arch/arm/mach-at91/at91rm9200_time.c | 1 arch/arm/mach-exynos/platsmp.c | 12 arch/arm/mach-hisi/platmcpm.c | 26 arch/arm/mach-omap2/omap-smp.c | 10 arch/arm/mach-prima2/platsmp.c | 10 arch/arm/mach-qcom/platsmp.c | 10 arch/arm/mach-spear/platsmp.c | 10 arch/arm/mach-sti/platsmp.c | 10 arch/arm/mach-ux500/platsmp.c | 10 arch/arm/mm/fault.c | 8 arch/arm/mm/highmem.c | 42 arch/arm/plat-versatile/platsmp.c | 10 arch/arm64/Kconfig | 2 arch/arm64/include/asm/thread_info.h | 3 arch/arm64/kernel/asm-offsets.c | 1 arch/arm64/kernel/entry.S | 13 arch/arm64/kernel/perf_event.c | 2 arch/avr32/mm/fault.c | 2 arch/cris/mm/fault.c | 2 arch/frv/mm/fault.c | 2 arch/ia64/mm/fault.c | 2 arch/m32r/mm/fault.c | 2 arch/m68k/mm/fault.c | 2 arch/microblaze/mm/fault.c | 2 arch/mips/Kconfig | 2 arch/mips/kernel/signal.c | 1 arch/mips/mm/fault.c | 2 arch/mips/mm/init.c | 4 arch/mn10300/mm/fault.c | 2 arch/parisc/mm/fault.c | 2 arch/powerpc/Kconfig | 6 arch/powerpc/include/asm/kvm_host.h | 4 arch/powerpc/include/asm/thread_info.h | 11 arch/powerpc/kernel/asm-offsets.c | 1 arch/powerpc/kernel/entry_32.S | 17 arch/powerpc/kernel/entry_64.S | 14 arch/powerpc/kernel/irq.c | 2 arch/powerpc/kernel/misc_32.S | 2 arch/powerpc/kernel/misc_64.S | 2 arch/powerpc/kernel/time.c | 2 arch/powerpc/kvm/Kconfig | 1 arch/powerpc/kvm/book3s_hv.c | 20 arch/powerpc/mm/fault.c | 2 arch/s390/include/asm/kvm_host.h | 2 arch/s390/kvm/interrupt.c | 8 arch/s390/mm/fault.c | 3 arch/score/mm/fault.c | 2 arch/sh/kernel/irq.c | 2 arch/sh/mm/fault.c | 2 arch/sparc/Kconfig | 10 arch/sparc/kernel/irq_64.c | 2 arch/sparc/kernel/setup_32.c | 1 arch/sparc/kernel/setup_64.c | 8 arch/sparc/mm/fault_32.c | 2 arch/sparc/mm/fault_64.c | 2 arch/tile/mm/fault.c | 2 arch/um/kernel/trap.c | 2 arch/x86/Kconfig | 8 arch/x86/crypto/aesni-intel_glue.c | 24 arch/x86/crypto/cast5_avx_glue.c | 21 arch/x86/crypto/glue_helper.c | 31 arch/x86/include/asm/preempt.h | 18 arch/x86/include/asm/signal.h | 13 arch/x86/include/asm/stackprotector.h | 10 arch/x86/include/asm/thread_info.h | 6 arch/x86/include/asm/uv/uv_bau.h | 14 arch/x86/include/asm/uv/uv_hub.h | 2 arch/x86/kernel/apic/io_apic.c | 3 arch/x86/kernel/apic/x2apic_uv_x.c | 2 arch/x86/kernel/asm-offsets.c | 2 arch/x86/kernel/cpu/mcheck/mce.c | 126 + arch/x86/kernel/entry_32.S | 20 arch/x86/kernel/entry_64.S | 31 arch/x86/kernel/irq_32.c | 2 arch/x86/kernel/process_32.c | 32 arch/x86/kernel/signal.c | 8 arch/x86/kernel/traps.c | 28 arch/x86/kvm/lapic.c | 48 arch/x86/kvm/x86.c | 7 arch/x86/mm/fault.c | 2 arch/x86/mm/highmem_32.c | 9 arch/x86/mm/iomap_32.c | 11 arch/x86/platform/uv/tlb_uv.c | 26 arch/x86/platform/uv/uv_time.c | 21 arch/xtensa/mm/fault.c | 2 block/blk-core.c | 19 block/blk-ioc.c | 5 block/blk-iopoll.c | 3 block/blk-mq-cpu.c | 17 block/blk-mq.c | 46 block/blk-mq.h | 9 block/blk-softirq.c | 3 block/bounce.c | 4 crypto/algapi.c | 4 crypto/api.c | 6 crypto/internal.h | 4 drivers/acpi/acpica/acglobal.h | 2 drivers/acpi/acpica/hwregs.c | 4 drivers/acpi/acpica/hwxface.c | 4 drivers/acpi/acpica/utmutex.c | 4 drivers/ata/libata-sff.c | 12 drivers/char/random.c | 14 drivers/clocksource/tcb_clksrc.c | 37 drivers/clocksource/timer-atmel-pit.c | 4 drivers/cpufreq/Kconfig.x86 | 2 drivers/gpio/gpio-omap.c | 74 - drivers/gpu/drm/i915/i915_gem.c | 2 drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 drivers/i2c/busses/i2c-omap.c | 5 drivers/ide/alim15x3.c | 4 drivers/ide/hpt366.c | 4 drivers/ide/ide-io-std.c | 8 drivers/ide/ide-io.c | 2 drivers/ide/ide-iops.c | 4 drivers/ide/ide-probe.c | 4 drivers/ide/ide-taskfile.c | 6 drivers/infiniband/ulp/ipoib/ipoib_multicast.c | 4 drivers/input/gameport/gameport.c | 8 drivers/leds/trigger/Kconfig | 2 drivers/md/bcache/Kconfig | 1 drivers/md/dm.c | 4 drivers/md/raid5.c | 7 drivers/md/raid5.h | 1 drivers/misc/Kconfig | 42 drivers/misc/Makefile | 1 drivers/misc/hwlat_detector.c | 1240 +++++++++++++++++++ drivers/mmc/host/mmci.c | 5 drivers/mmc/host/sdhci.c | 32 drivers/net/ethernet/3com/3c59x.c | 8 drivers/net/ethernet/atheros/atl1c/atl1c_main.c | 6 drivers/net/ethernet/atheros/atl1e/atl1e_main.c | 3 drivers/net/ethernet/chelsio/cxgb/sge.c | 3 drivers/net/ethernet/freescale/gianfar.c | 12 drivers/net/ethernet/neterion/s2io.c | 7 drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c | 6 drivers/net/ethernet/realtek/8139too.c | 2 drivers/net/ethernet/tehuti/tehuti.c | 9 drivers/net/rionet.c | 6 drivers/net/wireless/orinoco/orinoco_usb.c | 2 drivers/pci/access.c | 2 drivers/scsi/fcoe/fcoe.c | 18 drivers/scsi/fcoe/fcoe_ctlr.c | 4 drivers/scsi/libfc/fc_exch.c | 4 drivers/scsi/libsas/sas_ata.c | 4 drivers/scsi/qla2xxx/qla_inline.h | 4 drivers/thermal/x86_pkg_temp_thermal.c | 50 drivers/tty/serial/8250/8250_core.c | 14 drivers/tty/serial/amba-pl011.c | 15 drivers/tty/serial/omap-serial.c | 12 drivers/usb/core/hcd.c | 4 drivers/usb/gadget/function/f_fs.c | 2 drivers/usb/gadget/legacy/inode.c | 4 fs/aio.c | 24 fs/autofs4/autofs_i.h | 1 fs/autofs4/expire.c | 2 fs/buffer.c | 21 fs/dcache.c | 5 fs/eventpoll.c | 4 fs/exec.c | 2 fs/jbd/checkpoint.c | 2 fs/jbd2/checkpoint.c | 2 fs/namespace.c | 8 fs/ntfs/aops.c | 14 fs/timerfd.c | 5 fs/xfs/xfs_linux.h | 2 include/acpi/platform/aclinux.h | 15 include/asm-generic/bug.h | 14 include/linux/blk-mq.h | 1 include/linux/blkdev.h | 3 include/linux/bottom_half.h | 12 include/linux/buffer_head.h | 44 include/linux/cgroup.h | 2 include/linux/completion.h | 9 include/linux/cpu.h | 4 include/linux/delay.h | 6 include/linux/ftrace_event.h | 3 include/linux/highmem.h | 28 include/linux/hrtimer.h | 16 include/linux/idr.h | 4 include/linux/init_task.h | 10 include/linux/interrupt.h | 63 include/linux/irq.h | 4 include/linux/irq_work.h | 1 include/linux/irqdesc.h | 1 include/linux/irqflags.h | 29 include/linux/jbd_common.h | 24 include/linux/jump_label.h | 3 include/linux/kdb.h | 3 include/linux/kernel.h | 1 include/linux/kvm_host.h | 4 include/linux/lglock.h | 27 include/linux/list_bl.h | 28 include/linux/locallock.h | 270 ++++ include/linux/mm_types.h | 4 include/linux/mutex.h | 20 include/linux/mutex_rt.h | 84 + include/linux/netdevice.h | 1 include/linux/netfilter/x_tables.h | 7 include/linux/notifier.h | 34 include/linux/percpu.h | 29 include/linux/pid.h | 1 include/linux/preempt.h | 59 include/linux/preempt_mask.h | 15 include/linux/printk.h | 3 include/linux/radix-tree.h | 7 include/linux/random.h | 2 include/linux/rcupdate.h | 26 include/linux/rcutree.h | 18 include/linux/rtmutex.h | 30 include/linux/rwlock_rt.h | 99 + include/linux/rwlock_types.h | 7 include/linux/rwlock_types_rt.h | 33 include/linux/rwsem.h | 6 include/linux/rwsem_rt.h | 134 ++ include/linux/sched.h | 196 ++- include/linux/seqlock.h | 56 include/linux/signal.h | 1 include/linux/skbuff.h | 7 include/linux/smp.h | 3 include/linux/spinlock.h | 12 include/linux/spinlock_api_smp.h | 4 include/linux/spinlock_rt.h | 167 ++ include/linux/spinlock_types.h | 79 - include/linux/spinlock_types_nort.h | 33 include/linux/spinlock_types_raw.h | 56 include/linux/spinlock_types_rt.h | 51 include/linux/srcu.h | 9 include/linux/swap.h | 4 include/linux/sysctl.h | 1 include/linux/thread_info.h | 12 include/linux/timer.h | 2 include/linux/uaccess.h | 30 include/linux/uprobes.h | 1 include/linux/vmstat.h | 4 include/linux/wait-simple.h | 207 +++ include/linux/wait.h | 1 include/linux/work-simple.h | 24 include/net/dst.h | 2 include/net/neighbour.h | 4 include/net/netns/ipv4.h | 1 include/trace/events/hist.h | 72 + include/trace/events/latency_hist.h | 29 init/Kconfig | 7 init/Makefile | 2 init/main.c | 1 ipc/mqueue.c | 24 ipc/msg.c | 16 ipc/sem.c | 10 kernel/Kconfig.locks | 4 kernel/Kconfig.preempt | 33 kernel/cgroup.c | 9 kernel/cpu.c | 325 ++++ kernel/debug/kdb/kdb_io.c | 6 kernel/events/core.c | 1 kernel/exit.c | 2 kernel/fork.c | 40 kernel/futex.c | 84 - kernel/irq/handle.c | 8 kernel/irq/manage.c | 100 + kernel/irq/settings.h | 12 kernel/irq/spurious.c | 8 kernel/irq_work.c | 51 kernel/ksysfs.c | 12 kernel/locking/Makefile | 9 kernel/locking/lglock.c | 79 - kernel/locking/lockdep.c | 2 kernel/locking/percpu-rwsem.c | 4 kernel/locking/rt.c | 456 ++++++ kernel/locking/rtmutex.c | 734 ++++++++++- kernel/locking/rtmutex_common.h | 14 kernel/locking/spinlock.c | 7 kernel/locking/spinlock_debug.c | 5 kernel/panic.c | 2 kernel/power/hibernate.c | 7 kernel/power/suspend.c | 4 kernel/printk/printk.c | 139 +- kernel/ptrace.c | 7 kernel/rcu/tiny.c | 2 kernel/rcu/tree.c | 149 ++ kernel/rcu/tree.h | 15 kernel/rcu/tree_plugin.h | 170 -- kernel/rcu/update.c | 2 kernel/relay.c | 14 kernel/res_counter.c | 8 kernel/sched/Makefile | 2 kernel/sched/completion.c | 34 kernel/sched/core.c | 465 ++++++- kernel/sched/cputime.c | 62 kernel/sched/deadline.c | 1 kernel/sched/debug.c | 7 kernel/sched/fair.c | 16 kernel/sched/features.h | 8 kernel/sched/rt.c | 1 kernel/sched/sched.h | 10 kernel/sched/wait-simple.c | 115 + kernel/sched/work-simple.c | 172 ++ kernel/signal.c | 135 +- kernel/softirq.c | 732 +++++++++-- kernel/stop_machine.c | 98 + kernel/time/hrtimer.c | 346 ++++- kernel/time/itimer.c | 1 kernel/time/jiffies.c | 7 kernel/time/ntp.c | 43 kernel/time/posix-cpu-timers.c | 198 ++- kernel/time/posix-timers.c | 37 kernel/time/tick-common.c | 10 kernel/time/tick-internal.h | 3 kernel/time/tick-sched.c | 40 kernel/time/timekeeping.c | 6 kernel/time/timer.c | 109 + kernel/trace/Kconfig | 104 + kernel/trace/Makefile | 4 kernel/trace/latency_hist.c | 1178 ++++++++++++++++++ kernel/trace/trace.c | 42 kernel/trace/trace.h | 2 kernel/trace/trace_events.c | 2 kernel/trace/trace_irqsoff.c | 11 kernel/trace/trace_output.c | 18 kernel/user.c | 4 kernel/watchdog.c | 15 kernel/workqueue.c | 223 ++- kernel/workqueue_internal.h | 5 lib/Kconfig | 1 lib/Kconfig.debug | 2 lib/debugobjects.c | 5 lib/idr.c | 36 lib/locking-selftest.c | 50 lib/percpu_ida.c | 20 lib/radix-tree.c | 5 lib/scatterlist.c | 6 lib/smp_processor_id.c | 5 localversion-rt | 1 mm/Kconfig | 2 mm/filemap.c | 11 mm/highmem.c | 6 mm/memcontrol.c | 26 mm/memory.c | 26 mm/mmu_context.c | 2 mm/page_alloc.c | 142 +- mm/slab.h | 4 mm/slub.c | 125 + mm/swap.c | 34 mm/truncate.c | 7 mm/vmalloc.c | 13 mm/vmstat.c | 6 mm/workingset.c | 23 net/core/dev.c | 112 + net/core/skbuff.c | 6 net/core/sock.c | 3 net/ipv4/icmp.c | 30 net/ipv4/sysctl_net_ipv4.c | 7 net/mac80211/rx.c | 2 net/netfilter/core.c | 6 net/packet/af_packet.c | 5 net/rds/ib_rdma.c | 3 net/sched/sch_generic.c | 2 net/sunrpc/svc_xprt.c | 4 scripts/mkcompile_h | 4 sound/core/pcm_native.c | 8 virt/kvm/async_pf.c | 4 virt/kvm/kvm_main.c | 16 378 files changed, 11328 insertions(+), 1777 deletions(-) Index: linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt =================================================================== @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +Introduction: +------------- + +The module hwlat_detector is a special purpose kernel module that is used to +detect large system latencies induced by the behavior of certain underlying +hardware or firmware, independent of Linux itself. The code was developed +originally to detect SMIs (System Management Interrupts) on x86 systems, +however there is nothing x86 specific about this patchset. It was +originally written for use by the "RT" patch since the Real Time +kernel is highly latency sensitive. + +SMIs are usually not serviced by the Linux kernel, which typically does not +even know that they are occuring. SMIs are instead are set up by BIOS code +and are serviced by BIOS code, usually for "critical" events such as +management of thermal sensors and fans. Sometimes though, SMIs are used for +other tasks and those tasks can spend an inordinate amount of time in the +handler (sometimes measured in milliseconds). Obviously this is a problem if +you are trying to keep event service latencies down in the microsecond range. + +The hardware latency detector works by hogging all of the cpus for configurable +amounts of time (by calling stop_machine()), polling the CPU Time Stamp Counter +for some period, then looking for gaps in the TSC data. Any gap indicates a +time when the polling was interrupted and since the machine is stopped and +interrupts turned off the only thing that could do that would be an SMI. + +Note that the SMI detector should *NEVER* be used in a production environment. +It is intended to be run manually to determine if the hardware platform has a +problem with long system firmware service routines. + +Usage: +------ + +Loading the module hwlat_detector passing the parameter "enabled=1" (or by +setting the "enable" entry in "hwlat_detector" debugfs toggled on) is the only +step required to start the hwlat_detector. It is possible to redefine the +threshold in microseconds (us) above which latency spikes will be taken +into account (parameter "threshold="). + +Example: + + # modprobe hwlat_detector enabled=1 threshold=100 + +After the module is loaded, it creates a directory named "hwlat_detector" under +the debugfs mountpoint, "/debug/hwlat_detector" for this text. It is necessary +to have debugfs mounted, which might be on /sys/debug on your system. + +The /debug/hwlat_detector interface contains the following files: + +count - number of latency spikes observed since last reset +enable - a global enable/disable toggle (0/1), resets count +max - maximum hardware latency actually observed (usecs) +sample - a pipe from which to read current raw sample data + in the format <timestamp> <latency observed usecs> + (can be opened O_NONBLOCK for a single sample) +threshold - minimum latency value to be considered (usecs) +width - time period to sample with CPUs held (usecs) + must be less than the total window size (enforced) +window - total period of sampling, width being inside (usecs) + +By default we will set width to 500,000 and window to 1,000,000, meaning that +we will sample every 1,000,000 usecs (1s) for 500,000 usecs (0.5s). If we +observe any latencies that exceed the threshold (initially 100 usecs), +then we write to a global sample ring buffer of 8K samples, which is +consumed by reading from the "sample" (pipe) debugfs file interface. Index: linux-3.18.13-rt10-r7s4/Documentation/sysrq.txt =================================================================== --- linux-3.18.13-rt10-r7s4.orig/Documentation/sysrq.txt +++ linux-3.18.13-rt10-r7s4/Documentation/sysrq.txt @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:62 @ On PowerPC - Press 'ALT - Print Screen ( On other - If you know of the key combos for other architectures, please let me know so I can add them to this section. -On all - write a character to /proc/sysrq-trigger. e.g.: - +On all - write a character to /proc/sysrq-trigger, e.g.: echo t > /proc/sysrq-trigger +On all - Enable network SysRq by writing a cookie to icmp_echo_sysrq, e.g. + echo 0x01020304 >/proc/sys/net/ipv4/icmp_echo_sysrq + Send an ICMP echo request with this pattern plus the particular + SysRq command key. Example: + # ping -c1 -s57 -p0102030468 + will trigger the SysRq-H (help) command. + + * What are the 'command' keys? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 'b' - Will immediately reboot the system without syncing or unmounting Index: linux-3.18.13-rt10-r7s4/Documentation/trace/histograms.txt =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/Documentation/trace/histograms.txt @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ + Using the Linux Kernel Latency Histograms + + +This document gives a short explanation how to enable, configure and use +latency histograms. Latency histograms are primarily relevant in the +context of real-time enabled kernels (CONFIG_PREEMPT/CONFIG_PREEMPT_RT) +and are used in the quality management of the Linux real-time +capabilities. + + +* Purpose of latency histograms + +A latency histogram continuously accumulates the frequencies of latency +data. There are two types of histograms +- potential sources of latencies +- effective latencies + + +* Potential sources of latencies + +Potential sources of latencies are code segments where interrupts, +preemption or both are disabled (aka critical sections). To create +histograms of potential sources of latency, the kernel stores the time +stamp at the start of a critical section, determines the time elapsed +when the end of the section is reached, and increments the frequency +counter of that latency value - irrespective of whether any concurrently +running process is affected by latency or not. +- Configuration items (in the Kernel hacking/Tracers submenu) + CONFIG_INTERRUPT_OFF_LATENCY + CONFIG_PREEMPT_OFF_LATENCY + + +* Effective latencies + +Effective latencies are actually occuring during wakeup of a process. To +determine effective latencies, the kernel stores the time stamp when a +process is scheduled to be woken up, and determines the duration of the +wakeup time shortly before control is passed over to this process. Note +that the apparent latency in user space may be somewhat longer, since the +process may be interrupted after control is passed over to it but before +the execution in user space takes place. Simply measuring the interval +between enqueuing and wakeup may also not appropriate in cases when a +process is scheduled as a result of a timer expiration. The timer may have +missed its deadline, e.g. due to disabled interrupts, but this latency +would not be registered. Therefore, the offsets of missed timers are +recorded in a separate histogram. If both wakeup latency and missed timer +offsets are configured and enabled, a third histogram may be enabled that +records the overall latency as a sum of the timer latency, if any, and the +wakeup latency. This histogram is called "timerandwakeup". +- Configuration items (in the Kernel hacking/Tracers submenu) + CONFIG_WAKEUP_LATENCY + CONFIG_MISSED_TIMER_OFSETS + + +* Usage + +The interface to the administration of the latency histograms is located +in the debugfs file system. To mount it, either enter + +mount -t sysfs nodev /sys +mount -t debugfs nodev /sys/kernel/debug + +from shell command line level, or add + +nodev /sys sysfs defaults 0 0 +nodev /sys/kernel/debug debugfs defaults 0 0 + +to the file /etc/fstab. All latency histogram related files are then +available in the directory /sys/kernel/debug/tracing/latency_hist. A +particular histogram type is enabled by writing non-zero to the related +variable in the /sys/kernel/debug/tracing/latency_hist/enable directory. +Select "preemptirqsoff" for the histograms of potential sources of +latencies and "wakeup" for histograms of effective latencies etc. The +histogram data - one per CPU - are available in the files + +/sys/kernel/debug/tracing/latency_hist/preemptoff/CPUx +/sys/kernel/debug/tracing/latency_hist/irqsoff/CPUx +/sys/kernel/debug/tracing/latency_hist/preemptirqsoff/CPUx +/sys/kernel/debug/tracing/latency_hist/wakeup/CPUx +/sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio/CPUx +/sys/kernel/debug/tracing/latency_hist/missed_timer_offsets/CPUx +/sys/kernel/debug/tracing/latency_hist/timerandwakeup/CPUx + +The histograms are reset by writing non-zero to the file "reset" in a +particular latency directory. To reset all latency data, use + +#!/bin/sh + +TRACINGDIR=/sys/kernel/debug/tracing +HISTDIR=$TRACINGDIR/latency_hist + +if test -d $HISTDIR +then + cd $HISTDIR + for i in `find . | grep /reset$` + do + echo 1 >$i + done +fi + + +* Data format + +Latency data are stored with a resolution of one microsecond. The +maximum latency is 10,240 microseconds. The data are only valid, if the +overflow register is empty. Every output line contains the latency in +microseconds in the first row and the number of samples in the second +row. To display only lines with a positive latency count, use, for +example, + +grep -v " 0$" /sys/kernel/debug/tracing/latency_hist/preemptoff/CPU0 + +#Minimum latency: 0 microseconds. +#Average latency: 0 microseconds. +#Maximum latency: 25 microseconds. +#Total samples: 3104770694 +#There are 0 samples greater or equal than 10240 microseconds +#usecs samples + 0 2984486876 + 1 49843506 + 2 58219047 + 3 5348126 + 4 2187960 + 5 3388262 + 6 959289 + 7 208294 + 8 40420 + 9 4485 + 10 14918 + 11 18340 + 12 25052 + 13 19455 + 14 5602 + 15 969 + 16 47 + 17 18 + 18 14 + 19 1 + 20 3 + 21 2 + 22 5 + 23 2 + 25 1 + + +* Wakeup latency of a selected process + +To only collect wakeup latency data of a particular process, write the +PID of the requested process to + +/sys/kernel/debug/tracing/latency_hist/wakeup/pid + +PIDs are not considered, if this variable is set to 0. + + +* Details of the process with the highest wakeup latency so far + +Selected data of the process that suffered from the highest wakeup +latency that occurred in a particular CPU are available in the file + +/sys/kernel/debug/tracing/latency_hist/wakeup/max_latency-CPUx. + +In addition, other relevant system data at the time when the +latency occurred are given. + +The format of the data is (all in one line): +<PID> <Priority> <Latency> (<Timeroffset>) <Command> \ +<- <PID> <Priority> <Command> <Timestamp> + +The value of <Timeroffset> is only relevant in the combined timer +and wakeup latency recording. In the wakeup recording, it is +always 0, in the missed_timer_offsets recording, it is the same +as <Latency>. + +When retrospectively searching for the origin of a latency and +tracing was not enabled, it may be helpful to know the name and +some basic data of the task that (finally) was switching to the +late real-tlme task. In addition to the victim's data, also the +data of the possible culprit are therefore displayed after the +"<-" symbol. + +Finally, the timestamp of the time when the latency occurred +in <seconds>.<microseconds> after the most recent system boot +is provided. + +These data are also reset when the wakeup histogram is reset. Index: linux-3.18.13-rt10-r7s4/arch/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/Kconfig +++ linux-3.18.13-rt10-r7s4/arch/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:9 @ 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-3.18.13-rt10-r7s4/arch/alpha/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/alpha/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/alpha/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:110 @ do_page_fault(unsigned long address, uns /* If we're in an interrupt context, or have no user context, we must not take the fault. */ - if (!mm || in_atomic()) + if (!mm || pagefault_disabled()) goto no_context; #ifdef CONFIG_ALPHA_LARGE_VMALLOC Index: linux-3.18.13-rt10-r7s4/arch/arm/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/Kconfig +++ linux-3.18.13-rt10-r7s4/arch/arm/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:65 @ 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 Index: linux-3.18.13-rt10-r7s4/arch/arm/include/asm/cmpxchg.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/include/asm/cmpxchg.h +++ linux-3.18.13-rt10-r7s4/arch/arm/include/asm/cmpxchg.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:132 @ static inline unsigned long __xchg(unsig #else /* min ARCH >= ARMv6 */ +#define __HAVE_ARCH_CMPXCHG 1 + extern void __bad_cmpxchg(volatile void *ptr, int size); /* Index: linux-3.18.13-rt10-r7s4/arch/arm/include/asm/futex.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/include/asm/futex.h +++ linux-3.18.13-rt10-r7s4/arch/arm/include/asm/futex.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:96 @ futex_atomic_cmpxchg_inatomic(u32 *uval, if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) return -EFAULT; + preempt_disable_rt(); + __asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n" "1: " TUSER(ldr) " %1, [%4]\n" " teq %1, %2\n" @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:109 @ futex_atomic_cmpxchg_inatomic(u32 *uval, : "cc", "memory"); *uval = val; + + preempt_enable_rt(); return ret; } Index: linux-3.18.13-rt10-r7s4/arch/arm/include/asm/switch_to.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/include/asm/switch_to.h +++ linux-3.18.13-rt10-r7s4/arch/arm/include/asm/switch_to.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:6 @ #include <linux/thread_info.h> +#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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:32 @ extern struct task_struct *__switch_to(s #define switch_to(prev,next,last) \ do { \ + switch_kmaps(prev, next); \ last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \ } while (0) Index: linux-3.18.13-rt10-r7s4/arch/arm/include/asm/thread_info.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/include/asm/thread_info.h +++ linux-3.18.13-rt10-r7s4/arch/arm/include/asm/thread_info.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:54 @ 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 */ struct exec_domain *exec_domain; /* execution domain */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:153 @ extern int vfp_restore_user_hwstate(stru #define TIF_SIGPENDING 0 #define TIF_NEED_RESCHED 1 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ +#define TIF_NEED_RESCHED_LAZY 3 #define TIF_UPROBE 7 #define TIF_SYSCALL_TRACE 8 #define TIF_SYSCALL_AUDIT 9 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:167 @ 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) Index: linux-3.18.13-rt10-r7s4/arch/arm/kernel/asm-offsets.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/kernel/asm-offsets.c +++ linux-3.18.13-rt10-r7s4/arch/arm/kernel/asm-offsets.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:67 @ 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_EXEC_DOMAIN, offsetof(struct thread_info, exec_domain)); Index: linux-3.18.13-rt10-r7s4/arch/arm/kernel/entry-armv.S =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/kernel/entry-armv.S +++ linux-3.18.13-rt10-r7s4/arch/arm/kernel/entry-armv.S @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:210 @ __irq_svc: #ifdef CONFIG_PREEMPT get_thread_info tsk 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:236 @ 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 #endif Index: linux-3.18.13-rt10-r7s4/arch/arm/kernel/process.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/kernel/process.c +++ linux-3.18.13-rt10-r7s4/arch/arm/kernel/process.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:434 @ 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-3.18.13-rt10-r7s4/arch/arm/kernel/signal.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/kernel/signal.c +++ linux-3.18.13-rt10-r7s4/arch/arm/kernel/signal.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:577 @ asmlinkage int do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall) { 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-3.18.13-rt10-r7s4/arch/arm/kernel/unwind.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/kernel/unwind.c +++ linux-3.18.13-rt10-r7s4/arch/arm/kernel/unwind.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:96 @ 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 */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:204 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:216 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:533 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:547 @ 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-3.18.13-rt10-r7s4/arch/arm/kvm/arm.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/kvm/arm.c +++ linux-3.18.13-rt10-r7s4/arch/arm/kvm/arm.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:444 @ static int kvm_vcpu_first_run_init(struc static void vcpu_pause(struct kvm_vcpu *vcpu) { - wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); + struct swait_head *wq = kvm_arch_vcpu_wq(vcpu); - wait_event_interruptible(*wq, !vcpu->arch.pause); + swait_event_interruptible(*wq, !vcpu->arch.pause); } static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) Index: linux-3.18.13-rt10-r7s4/arch/arm/kvm/psci.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/kvm/psci.c +++ linux-3.18.13-rt10-r7s4/arch/arm/kvm/psci.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:69 @ static unsigned long kvm_psci_vcpu_on(st { struct kvm *kvm = source_vcpu->kvm; struct kvm_vcpu *vcpu = NULL, *tmp; - wait_queue_head_t *wq; + struct swait_head *wq; unsigned long cpu_id; unsigned long context_id; unsigned long mpidr; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:126 @ static unsigned long kvm_psci_vcpu_on(st smp_mb(); /* Make sure the above is visible */ wq = kvm_arch_vcpu_wq(vcpu); - wake_up_interruptible(wq); + swait_wake_interruptible(wq); return PSCI_RET_SUCCESS; } Index: linux-3.18.13-rt10-r7s4/arch/arm/mach-at91/at91rm9200_time.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mach-at91/at91rm9200_time.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mach-at91/at91rm9200_time.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:138 @ clkevt32k_mode(enum clock_event_mode mod break; case CLOCK_EVT_MODE_SHUTDOWN: case CLOCK_EVT_MODE_UNUSED: + remove_irq(NR_IRQS_LEGACY + AT91_ID_SYS, &at91rm9200_timer_irq); case CLOCK_EVT_MODE_RESUME: irqmask = 0; break; Index: linux-3.18.13-rt10-r7s4/arch/arm/mach-exynos/platsmp.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mach-exynos/platsmp.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mach-exynos/platsmp.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:140 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:153 @ 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); } static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:168 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:195 @ 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; } } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:245 @ 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-3.18.13-rt10-r7s4/arch/arm/mach-hisi/platmcpm.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mach-hisi/platmcpm.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mach-hisi/platmcpm.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:60 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:107 @ static int hip04_mcpm_power_up(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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:136 @ static int hip04_mcpm_power_up(unsigned udelay(20); out: hip04_cpu_table[cluster][cpu]++; - spin_unlock_irq(&boot_lock); + raw_spin_unlock_irq(&boot_lock); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:152 @ static void hip04_mcpm_power_down(void) __mcpm_cpu_going_down(cpu, cluster); - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); BUG_ON(__mcpm_cluster_state(cluster) != CLUSTER_UP); hip04_cpu_table[cluster][cpu]--; if (hip04_cpu_table[cluster][cpu] == 1) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:165 @ static void hip04_mcpm_power_down(void) last_man = hip04_cluster_is_down(cluster); if (last_man && __mcpm_outbound_enter_critical(cpu, cluster)) { - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); /* Since it's Cortex A15, disable L2 prefetching. */ asm volatile( "mcr p15, 1, %0, c15, c0, 3 \n\t" @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:176 @ static void hip04_mcpm_power_down(void) hip04_set_snoop_filter(cluster, 0); __mcpm_outbound_leave_critical(cluster, CLUSTER_DOWN); } else { - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); v7_exit_coherency_flush(louis); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:195 @ static int hip04_mcpm_wait_for_powerdown 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]) { ret = -EBUSY; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:205 @ static int hip04_mcpm_wait_for_powerdown 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:223 @ static int hip04_mcpm_wait_for_powerdown } if (tries >= count) goto err; - spin_unlock_irq(&boot_lock); + raw_spin_unlock_irq(&boot_lock); return 0; err: - spin_unlock_irq(&boot_lock); + raw_spin_unlock_irq(&boot_lock); return ret; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:238 @ static void hip04_mcpm_powered_up(void) cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); - spin_lock(&boot_lock); + raw_spin_lock(&boot_lock); if (!hip04_cpu_table[cluster][cpu]) hip04_cpu_table[cluster][cpu] = 1; - spin_unlock(&boot_lock); + raw_spin_unlock(&boot_lock); } static void __naked hip04_mcpm_power_up_setup(unsigned int affinity_level) Index: linux-3.18.13-rt10-r7s4/arch/arm/mach-omap2/omap-smp.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mach-omap2/omap-smp.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mach-omap2/omap-smp.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:46 @ /* SCU base address */ static void __iomem *scu_base; -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); void __iomem *omap4_get_scu_base(void) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:77 @ 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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:92 @ 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. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:169 @ 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-3.18.13-rt10-r7s4/arch/arm/mach-prima2/platsmp.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mach-prima2/platsmp.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mach-prima2/platsmp.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:26 @ static void __iomem *scu_base; static void __iomem *rsc_base; -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); static struct map_desc scu_io_desc __initdata = { .length = SZ_4K, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:59 @ 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 struct of_device_id rsc_ids[] = { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:98 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:130 @ 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-3.18.13-rt10-r7s4/arch/arm/mach-qcom/platsmp.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mach-qcom/platsmp.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mach-qcom/platsmp.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:49 @ extern void secondary_startup(void); -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); #ifdef CONFIG_HOTPLUG_CPU static void __ref qcom_cpu_die(unsigned int cpu) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:63 @ 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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:287 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:300 @ 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-3.18.13-rt10-r7s4/arch/arm/mach-spear/platsmp.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mach-spear/platsmp.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mach-spear/platsmp.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:35 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:50 @ 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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:62 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:87 @ 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-3.18.13-rt10-r7s4/arch/arm/mach-sti/platsmp.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mach-sti/platsmp.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mach-sti/platsmp.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:37 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:52 @ 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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:64 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:95 @ 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-3.18.13-rt10-r7s4/arch/arm/mach-ux500/platsmp.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mach-ux500/platsmp.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mach-ux500/platsmp.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:54 @ static void __iomem *scu_base_addr(void) return NULL; } -static DEFINE_SPINLOCK(boot_lock); +static DEFINE_RAW_SPINLOCK(boot_lock); static void ux500_secondary_init(unsigned int cpu) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:67 @ static void ux500_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 ux500_boot_secondary(unsigned int cpu, struct task_struct *idle) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:79 @ static int ux500_boot_secondary(unsigned * 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:100 @ static int ux500_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 pen_release != -1 ? -ENOSYS : 0; } Index: linux-3.18.13-rt10-r7s4/arch/arm/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:280 @ do_page_fault(unsigned long addr, unsign * If we're in an interrupt or have no user * context, we must not take the fault.. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto no_context; if (user_mode(regs)) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:434 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:504 @ 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-3.18.13-rt10-r7s4/arch/arm/mm/highmem.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/mm/highmem.c +++ linux-3.18.13-rt10-r7s4/arch/arm/mm/highmem.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:56 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:95 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:115 @ void __kunmap_atomic(void *kvaddr) 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() */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:135 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:150 @ void *kmap_atomic_pfn(unsigned long pfn) #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(!pte_none(*(fixmap_page_table + idx))); #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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:167 @ struct page *kmap_atomic_to_page(const v return pte_page(get_fixmap_pte(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 = i + KM_TYPE_NR * smp_processor_id(); + + set_fixmap_pte(idx, __pte(0)); + } + /* + * 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_fixmap_pte(idx, next_p->kmap_pte[i]); + } +} +#endif Index: linux-3.18.13-rt10-r7s4/arch/arm/plat-versatile/platsmp.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm/plat-versatile/platsmp.c +++ linux-3.18.13-rt10-r7s4/arch/arm/plat-versatile/platsmp.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:33 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:46 @ 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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:58 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:88 @ 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-3.18.13-rt10-r7s4/arch/arm64/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm64/Kconfig +++ linux-3.18.13-rt10-r7s4/arch/arm64/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:62 @ config ARM64 select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP select HAVE_RCU_TABLE_FREE + select HAVE_PREEMPT_LAZY select HAVE_SYSCALL_TRACEPOINTS select IRQ_DOMAIN + select IRQ_FORCED_THREADING select MODULES_USE_ELF_RELA select NO_BOOTMEM select OF Index: linux-3.18.13-rt10-r7s4/arch/arm64/include/asm/thread_info.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm64/include/asm/thread_info.h +++ linux-3.18.13-rt10-r7s4/arch/arm64/include/asm/thread_info.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:53 @ struct thread_info { struct exec_domain *exec_domain; /* execution domain */ struct restart_block restart_block; int preempt_count; /* 0 => preemptable, <0 => bug */ + int preempt_lazy_count; /* 0 => preemptable, <0 => bug */ int cpu; /* cpu */ }; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:112 @ static inline struct thread_info *curren #define TIF_NEED_RESCHED 1 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ #define TIF_FOREIGN_FPSTATE 3 /* CPU's FP state is not current's */ +#define TIF_NEED_RESCHED_LAZY 4 #define TIF_NOHZ 7 #define TIF_SYSCALL_TRACE 8 #define TIF_SYSCALL_AUDIT 9 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:129 @ static inline struct thread_info *curren #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) Index: linux-3.18.13-rt10-r7s4/arch/arm64/kernel/asm-offsets.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm64/kernel/asm-offsets.c +++ linux-3.18.13-rt10-r7s4/arch/arm64/kernel/asm-offsets.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:39 @ 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_EXEC_DOMAIN, offsetof(struct thread_info, exec_domain)); Index: linux-3.18.13-rt10-r7s4/arch/arm64/kernel/entry.S =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm64/kernel/entry.S +++ linux-3.18.13-rt10-r7s4/arch/arm64/kernel/entry.S @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:370 @ el1_irq: #ifdef CONFIG_PREEMPT get_thread_info tsk ldr w24, [tsk, #TI_PREEMPT] // get preempt count - cbnz w24, 1f // preempt count != 0 + cbnz w24, 2f // preempt count != 0 ldr x0, [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, #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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:393 @ el1_preempt: 1: bl preempt_schedule_irq // irq en/disable is done inside ldr x0, [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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:630 @ fast_work_pending: str x0, [sp, #S_X0] // returned x0 work_pending: tbnz x1, #TIF_NEED_RESCHED, work_resched + tbnz x1, #TIF_NEED_RESCHED_LAZY, work_resched /* TIF_SIGPENDING, TIF_NOTIFY_RESUME or TIF_FOREIGN_FPSTATE case */ ldr x2, [sp, #S_PSTATE] mov x0, sp // 'regs' Index: linux-3.18.13-rt10-r7s4/arch/arm64/kernel/perf_event.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/arm64/kernel/perf_event.c +++ linux-3.18.13-rt10-r7s4/arch/arm64/kernel/perf_event.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:464 @ armpmu_reserve_hardware(struct arm_pmu * } err = request_irq(irq, armpmu->handle_irq, - IRQF_NOBALANCING, + IRQF_NOBALANCING | IRQF_NO_THREAD, "arm-pmu", armpmu); if (err) { pr_err("unable to request IRQ%d for ARM PMU counters\n", Index: linux-3.18.13-rt10-r7s4/arch/avr32/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/avr32/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/avr32/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:84 @ asmlinkage void do_page_fault(unsigned l * If we're in an interrupt or have no user context, we must * not take the fault... */ - if (in_atomic() || !mm || regs->sr & SYSREG_BIT(GM)) + if (!mm || regs->sr & SYSREG_BIT(GM) || pagefault_disabled()) goto no_context; local_irq_enable(); Index: linux-3.18.13-rt10-r7s4/arch/cris/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/cris/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/cris/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:116 @ do_page_fault(unsigned long address, str * user context, we must not take the fault. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto no_context; if (user_mode(regs)) Index: linux-3.18.13-rt10-r7s4/arch/frv/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/frv/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/frv/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:81 @ asmlinkage void do_page_fault(int datamm * If we're in an interrupt or have no user * context, we must not take the fault.. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto no_context; if (user_mode(__frame)) Index: linux-3.18.13-rt10-r7s4/arch/ia64/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/ia64/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/ia64/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:99 @ ia64_do_page_fault (unsigned long addres /* * If we're in an interrupt or have no user context, we must not take the fault.. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto no_context; #ifdef CONFIG_VIRTUAL_MEM_MAP Index: linux-3.18.13-rt10-r7s4/arch/m32r/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/m32r/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/m32r/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:117 @ asmlinkage void do_page_fault(struct pt_ * If we're in an interrupt or have no user context or are running in an * atomic region then we must not take the fault.. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto bad_area_nosemaphore; if (error_code & ACE_USERMODE) Index: linux-3.18.13-rt10-r7s4/arch/m68k/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/m68k/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/m68k/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:84 @ int do_page_fault(struct pt_regs *regs, * If we're in an interrupt or have no user * context, we must not take the fault.. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto no_context; if (user_mode(regs)) Index: linux-3.18.13-rt10-r7s4/arch/microblaze/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/microblaze/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/microblaze/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:110 @ void do_page_fault(struct pt_regs *regs, if ((error_code & 0x13) == 0x13 || (error_code & 0x11) == 0x11) is_write = 0; - if (unlikely(in_atomic() || !mm)) { + if (unlikely(!mm || pagefault_disabled())) { if (kernel_mode(regs)) goto bad_area_nosemaphore; Index: linux-3.18.13-rt10-r7s4/arch/mips/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/mips/Kconfig +++ linux-3.18.13-rt10-r7s4/arch/mips/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2199 @ config CPU_R4400_WORKAROUNDS # 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-3.18.13-rt10-r7s4/arch/mips/kernel/signal.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/mips/kernel/signal.c +++ linux-3.18.13-rt10-r7s4/arch/mips/kernel/signal.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:616 @ asmlinkage void do_notify_resume(struct __u32 thread_info_flags) { local_irq_enable(); + preempt_check_resched(); user_exit(); Index: linux-3.18.13-rt10-r7s4/arch/mips/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/mips/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/mips/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:92 @ static void __kprobes __do_page_fault(st * If we're in an interrupt or have no user * context, we must not take the fault.. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto bad_area_nosemaphore; if (user_mode(regs)) Index: linux-3.18.13-rt10-r7s4/arch/mips/mm/init.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/mips/mm/init.c +++ linux-3.18.13-rt10-r7s4/arch/mips/mm/init.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:93 @ static void *__kmap_pgprot(struct page * BUG_ON(Page_dcache_dirty(page)); - pagefault_disable(); + raw_pagefault_disable(); idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1); idx += in_interrupt() ? FIX_N_COLOURS : 0; vaddr = __fix_to_virt(FIX_CMAP_END - idx); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:149 @ void kunmap_coherent(void) tlbw_use_hazard(); write_c0_entryhi(old_ctx); local_irq_restore(flags); - pagefault_enable(); + raw_pagefault_enable(); } void copy_user_highpage(struct page *to, struct page *from, Index: linux-3.18.13-rt10-r7s4/arch/mn10300/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/mn10300/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/mn10300/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:171 @ asmlinkage void do_page_fault(struct pt_ * If we're in an interrupt or have no user * context, we must not take the fault.. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto no_context; if ((fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_USR) Index: linux-3.18.13-rt10-r7s4/arch/parisc/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/parisc/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/parisc/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:210 @ void do_page_fault(struct pt_regs *regs, int fault; unsigned int flags; - if (in_atomic()) + if (pagefault_disabled()) goto no_context; tsk = current; Index: linux-3.18.13-rt10-r7s4/arch/powerpc/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/Kconfig +++ linux-3.18.13-rt10-r7s4/arch/powerpc/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:63 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:140 @ config PPC select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select GENERIC_STRNCPY_FROM_USER select GENERIC_STRNLEN_USER + select HAVE_PREEMPT_LAZY select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_RELA select CLONE_BACKWARDS @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:308 @ 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-3.18.13-rt10-r7s4/arch/powerpc/include/asm/kvm_host.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/include/asm/kvm_host.h +++ linux-3.18.13-rt10-r7s4/arch/powerpc/include/asm/kvm_host.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:299 @ struct kvmppc_vcore { u8 in_guest; struct list_head runnable_threads; spinlock_t lock; - wait_queue_head_t wq; + struct swait_head wq; u64 stolen_tb; u64 preempt_tb; struct kvm_vcpu *runner; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:621 @ struct kvm_vcpu_arch { u8 prodded; u32 last_inst; - wait_queue_head_t *wqp; + struct swait_head *wqp; struct kvmppc_vcore *vcore; int ret; int trap; Index: linux-3.18.13-rt10-r7s4/arch/powerpc/include/asm/thread_info.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/include/asm/thread_info.h +++ linux-3.18.13-rt10-r7s4/arch/powerpc/include/asm/thread_info.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:46 @ struct thread_info { int cpu; /* cpu we're on */ int preempt_count; /* 0 => preemptable, <0 => BUG */ + int preempt_lazy_count; /* 0 => preemptable, + <0 => BUG */ struct restart_block restart_block; unsigned long local_flags; /* private flags for thread */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:93 @ 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_SYSCALL_AUDIT 7 /* syscall auditing active */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:111 @ 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<<TIF_SYSCALL_TRACE) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:131 @ static inline struct thread_info *curren #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) #define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE) #define _TIF_NOHZ (1<<TIF_NOHZ) +#define _TIF_NEED_RESCHED_LAZY (1<<TIF_NEED_RESCHED_LAZY) #define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \ _TIF_NOHZ) #define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ _TIF_NOTIFY_RESUME | _TIF_UPROBE | \ - _TIF_RESTORE_TM) + _TIF_RESTORE_TM | _TIF_NEED_RESCHED_LAZY) #define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL|_TIF_NOERROR) +#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY) /* Bits in local_flags */ /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */ Index: linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/asm-offsets.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/kernel/asm-offsets.c +++ linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/asm-offsets.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:162 @ int main(void) DEFINE(TI_FLAGS, offsetof(struct thread_info, flags)); DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags)); DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count)); + DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count)); DEFINE(TI_TASK, offsetof(struct thread_info, task)); DEFINE(TI_CPU, offsetof(struct thread_info, cpu)); Index: linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/entry_32.S =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/kernel/entry_32.S +++ linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/entry_32.S @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:893 @ resume_kernel: cmpwi 0,r0,0 /* if non-zero, just restore regs and return */ bne restore andi. r8,r8,_TIF_NEED_RESCHED + bne+ 1f + lwz r0,TI_PREEMPT_LAZY(r9) + cmpwi 0,r0,0 /* if non-zero, just restore regs and return */ + bne restore + lwz r0,TI_FLAGS(r9) + andi. r0,r0,_TIF_NEED_RESCHED_LAZY beq+ restore +1: lwz r3,_MSR(r1) andi. r0,r3,MSR_EE /* interrupts off? */ beq restore /* don't schedule if so */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:911 @ resume_kernel: */ bl trace_hardirqs_off #endif -1: bl preempt_schedule_irq +2: bl preempt_schedule_irq CURRENT_THREAD_INFO(r9, r1) lwz r3,TI_FLAGS(r9) - andi. r0,r3,_TIF_NEED_RESCHED - bne- 1b + andi. r0,r3,_TIF_NEED_RESCHED_MASK + bne- 2b #ifdef CONFIG_TRACE_IRQFLAGS /* And now, to properly rebalance the above, we tell lockdep they * are being turned back on, which will happen when we return @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1236 @ global_dbcr0: #endif /* !(CONFIG_4xx || CONFIG_BOOKE) */ do_work: /* r10 contains MSR_KERNEL here */ - andi. r0,r9,_TIF_NEED_RESCHED + andi. r0,r9,_TIF_NEED_RESCHED_MASK beq do_user_signal do_resched: /* r10 contains MSR_KERNEL here */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1257 @ recheck: MTMSRD(r10) /* disable interrupts */ CURRENT_THREAD_INFO(r9, r1) lwz r9,TI_FLAGS(r9) - andi. r0,r9,_TIF_NEED_RESCHED + andi. r0,r9,_TIF_NEED_RESCHED_MASK bne- do_resched andi. r0,r9,_TIF_USER_WORK_MASK beq restore_user Index: linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/entry_64.S =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/kernel/entry_64.S +++ linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/entry_64.S @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:647 @ _GLOBAL(ret_from_except_lite) #else beq restore #endif -1: andi. r0,r4,_TIF_NEED_RESCHED +1: andi. r0,r4,_TIF_NEED_RESCHED_MASK beq 2f bl restore_interrupts SCHEDULE_USER @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:709 @ resume_kernel: #ifdef CONFIG_PREEMPT /* Check if we need to preempt */ + lwz r8,TI_PREEMPT(r9) + cmpwi 0,r8,0 /* if non-zero, just restore regs and return */ + bne restore andi. r0,r4,_TIF_NEED_RESCHED + bne+ check_count + + andi. r0,r4,_TIF_NEED_RESCHED_LAZY beq+ restore + lwz r8,TI_PREEMPT_LAZY(r9) + /* Check that preempt_count() == 0 and interrupts are enabled */ - lwz r8,TI_PREEMPT(r9) +check_count: cmpwi cr1,r8,0 ld r0,SOFTE(r1) cmpdi r0,0 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:737 @ resume_kernel: /* Re-test flags and eventually loop */ CURRENT_THREAD_INFO(r9, r1) ld r4,TI_FLAGS(r9) - andi. r0,r4,_TIF_NEED_RESCHED + andi. r0,r4,_TIF_NEED_RESCHED_MASK bne 1b /* Index: linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/irq.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/kernel/irq.c +++ linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/irq.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:618 @ void irq_ctx_init(void) } } +#ifndef CONFIG_PREEMPT_RT_FULL void do_softirq_own_stack(void) { struct thread_info *curtp, *irqtp; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:636 @ void do_softirq_own_stack(void) if (irqtp->flags) set_bits(irqtp->flags, &curtp->flags); } +#endif irq_hw_number_t virq_to_hw(unsigned int virq) { Index: linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/misc_32.S =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/kernel/misc_32.S +++ linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/misc_32.S @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:43 @ * 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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:60 @ _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-3.18.13-rt10-r7s4/arch/powerpc/kernel/misc_64.S =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/kernel/misc_64.S +++ linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/misc_64.S @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:32 @ .text +#ifndef CONFIG_PREEMPT_RT_FULL _GLOBAL(call_do_softirq) mflr r0 std r0,16(r1) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:43 @ _GLOBAL(call_do_softirq) ld r0,16(r1) mtlr r0 blr +#endif _GLOBAL(call_do_irq) mflr r0 Index: linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/time.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/kernel/time.c +++ linux-3.18.13-rt10-r7s4/arch/powerpc/kernel/time.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:427 @ unsigned long profile_pc(struct pt_regs EXPORT_SYMBOL(profile_pc); #endif -#ifdef CONFIG_IRQ_WORK +#if defined(CONFIG_IRQ_WORK) /* * 64-bit uses a byte in the PACA, 32-bit uses a per-cpu variable... Index: linux-3.18.13-rt10-r7s4/arch/powerpc/kvm/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/kvm/Kconfig +++ linux-3.18.13-rt10-r7s4/arch/powerpc/kvm/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:160 @ 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-3.18.13-rt10-r7s4/arch/powerpc/kvm/book3s_hv.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/kvm/book3s_hv.c +++ linux-3.18.13-rt10-r7s4/arch/powerpc/kvm/book3s_hv.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:87 @ static void kvmppc_fast_vcpu_kick_hv(str { int me; int cpu = vcpu->cpu; - wait_queue_head_t *wqp; + struct swait_head *wqp; wqp = kvm_arch_vcpu_wq(vcpu); - if (waitqueue_active(wqp)) { - wake_up_interruptible(wqp); + if (swaitqueue_active(wqp)) { + swait_wake_interruptible(wqp); ++vcpu->stat.halt_wakeup; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:642 @ int kvmppc_pseries_do_hcall(struct kvm_v tvcpu->arch.prodded = 1; smp_mb(); if (vcpu->arch.ceded) { - if (waitqueue_active(&vcpu->wq)) { - wake_up_interruptible(&vcpu->wq); + if (swaitqueue_active(&vcpu->wq)) { + swait_wake_interruptible(&vcpu->wq); vcpu->stat.halt_wakeup++; } } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1360 @ static struct kvmppc_vcore *kvmppc_vcore INIT_LIST_HEAD(&vcore->runnable_threads); spin_lock_init(&vcore->lock); - init_waitqueue_head(&vcore->wq); + init_swait_head(&vcore->wq); vcore->preempt_tb = TB_NIL; vcore->lpcr = kvm->arch.lpcr; vcore->first_vcpuid = core * threads_per_subcore; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1829 @ static void kvmppc_wait_for_exec(struct */ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc) { - DEFINE_WAIT(wait); + DEFINE_SWAITER(wait); - prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE); + swait_prepare(&vc->wq, &wait, TASK_INTERRUPTIBLE); vc->vcore_state = VCORE_SLEEPING; spin_unlock(&vc->lock); schedule(); - finish_wait(&vc->wq, &wait); + swait_finish(&vc->wq, &wait); spin_lock(&vc->lock); vc->vcore_state = VCORE_INACTIVE; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1876 @ static int kvmppc_run_vcpu(struct kvm_ru kvmppc_create_dtl_entry(vcpu, vc); kvmppc_start_thread(vcpu); } else if (vc->vcore_state == VCORE_SLEEPING) { - wake_up(&vc->wq); + swait_wake(&vc->wq); } } Index: linux-3.18.13-rt10-r7s4/arch/powerpc/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/powerpc/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/powerpc/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:276 @ int __kprobes do_page_fault(struct pt_re if (!arch_irq_disabled_regs(regs)) local_irq_enable(); - if (in_atomic() || mm == NULL) { + if (in_atomic() || mm == NULL || pagefault_disabled()) { if (!user_mode(regs)) { rc = SIGSEGV; goto bail; Index: linux-3.18.13-rt10-r7s4/arch/s390/include/asm/kvm_host.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/s390/include/asm/kvm_host.h +++ linux-3.18.13-rt10-r7s4/arch/s390/include/asm/kvm_host.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:314 @ struct kvm_s390_local_interrupt { struct list_head list; atomic_t active; struct kvm_s390_float_interrupt *float_int; - wait_queue_head_t *wq; + struct swait_head *wq; atomic_t *cpuflags; unsigned int action_bits; }; Index: linux-3.18.13-rt10-r7s4/arch/s390/kvm/interrupt.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/s390/kvm/interrupt.c +++ linux-3.18.13-rt10-r7s4/arch/s390/kvm/interrupt.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:622 @ no_timer: void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu) { - if (waitqueue_active(&vcpu->wq)) { + if (swaitqueue_active(&vcpu->wq)) { /* * The vcpu gave up the cpu voluntarily, mark it as a good * yield-candidate. */ vcpu->preempted = true; - wake_up_interruptible(&vcpu->wq); + swait_wake_interruptible(&vcpu->wq); vcpu->stat.halt_wakeup++; } } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:749 @ int kvm_s390_inject_program_int(struct k spin_lock(&li->lock); list_add(&inti->list, &li->list); atomic_set(&li->active, 1); - BUG_ON(waitqueue_active(li->wq)); + BUG_ON(swaitqueue_active(li->wq)); spin_unlock(&li->lock); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:774 @ int kvm_s390_inject_prog_irq(struct kvm_ spin_lock(&li->lock); list_add(&inti->list, &li->list); atomic_set(&li->active, 1); - BUG_ON(waitqueue_active(li->wq)); + BUG_ON(swaitqueue_active(li->wq)); spin_unlock(&li->lock); return 0; } Index: linux-3.18.13-rt10-r7s4/arch/s390/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/s390/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/s390/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:438 @ static inline int do_exception(struct pt * user context. */ fault = VM_FAULT_BADCONTEXT; - if (unlikely(!user_space_fault(regs) || in_atomic() || !mm)) + if (unlikely(!user_space_fault(regs) || !mm || + tsk->pagefault_disabled)) goto out; address = trans_exc_code & __FAIL_ADDR_MASK; Index: linux-3.18.13-rt10-r7s4/arch/score/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/score/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/score/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:76 @ asmlinkage void do_page_fault(struct pt_ * If we're in an interrupt or have no user * context, we must not take the fault.. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto bad_area_nosemaphore; if (user_mode(regs)) Index: linux-3.18.13-rt10-r7s4/arch/sh/kernel/irq.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/sh/kernel/irq.c +++ linux-3.18.13-rt10-r7s4/arch/sh/kernel/irq.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:152 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:180 @ 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-3.18.13-rt10-r7s4/arch/sh/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/sh/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/sh/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:443 @ asmlinkage void __kprobes do_page_fault( * If we're in an interrupt, have no user context or are running * in an atomic region then we must not take the fault: */ - if (unlikely(in_atomic() || !mm)) { + if (unlikely(!mm || pagefault_disabled())) { bad_area_nosemaphore(regs, error_code, address); return; } Index: linux-3.18.13-rt10-r7s4/arch/sparc/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/sparc/Kconfig +++ linux-3.18.13-rt10-r7s4/arch/sparc/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:185 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:529 @ menu "Executable file formats" source "fs/Kconfig.binfmt" +config EARLY_PRINTK + bool + default y + config COMPAT bool depends on SPARC64 Index: linux-3.18.13-rt10-r7s4/arch/sparc/kernel/irq_64.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/sparc/kernel/irq_64.c +++ linux-3.18.13-rt10-r7s4/arch/sparc/kernel/irq_64.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:852 @ 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()]; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:867 @ 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-3.18.13-rt10-r7s4/arch/sparc/kernel/setup_32.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/sparc/kernel/setup_32.c +++ linux-3.18.13-rt10-r7s4/arch/sparc/kernel/setup_32.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:312 @ void __init setup_arch(char **cmdline_p) boot_flags_init(*cmdline_p); + early_console = &prom_early_console; register_console(&prom_early_console); printk("ARCH: "); Index: linux-3.18.13-rt10-r7s4/arch/sparc/kernel/setup_64.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/sparc/kernel/setup_64.c +++ linux-3.18.13-rt10-r7s4/arch/sparc/kernel/setup_64.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:566 @ static void __init init_sparc64_elf_hwca pause_patch(); } +static inline void register_prom_console(void) +{ + early_console = &prom_early_console; + register_console(&prom_early_console); +} + void __init setup_arch(char **cmdline_p) { /* Initialize PROM console and command line. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:583 @ void __init setup_arch(char **cmdline_p) #ifdef CONFIG_EARLYFB if (btext_find_display()) #endif - register_console(&prom_early_console); + register_prom_console(); if (tlb_type == hypervisor) printk("ARCH: SUN4V\n"); Index: linux-3.18.13-rt10-r7s4/arch/sparc/mm/fault_32.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/sparc/mm/fault_32.c +++ linux-3.18.13-rt10-r7s4/arch/sparc/mm/fault_32.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:199 @ asmlinkage void do_sparc_fault(struct pt * If we're in an interrupt or have no user * context, we must not take the fault.. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto no_context; perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); Index: linux-3.18.13-rt10-r7s4/arch/sparc/mm/fault_64.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/sparc/mm/fault_64.c +++ linux-3.18.13-rt10-r7s4/arch/sparc/mm/fault_64.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:333 @ asmlinkage void __kprobes do_sparc64_fau * If we're in an interrupt or have no user * context, we must not take the fault.. */ - if (in_atomic() || !mm) + if (!mm || pagefault_disabled()) goto intr_or_no_mm; perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); Index: linux-3.18.13-rt10-r7s4/arch/tile/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/tile/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/tile/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:360 @ static int handle_page_fault(struct pt_r * If we're in an interrupt, have no user context or are running in an * atomic region then we must not take the fault. */ - if (in_atomic() || !mm) { + if (!mm || pagefault_disabled()) { vma = NULL; /* happy compiler */ goto bad_area_nosemaphore; } Index: linux-3.18.13-rt10-r7s4/arch/um/kernel/trap.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/um/kernel/trap.c +++ linux-3.18.13-rt10-r7s4/arch/um/kernel/trap.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:41 @ int handle_page_fault(unsigned long addr * If the fault was during atomic operation, don't take the fault, just * fail. */ - if (in_atomic()) + if (pagefault_disabled()) goto out_nosemaphore; if (is_user) Index: linux-3.18.13-rt10-r7s4/arch/x86/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/Kconfig +++ linux-3.18.13-rt10-r7s4/arch/x86/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:24 @ config X86_64 ### Arch settings config X86 def_bool y + select HAVE_PREEMPT_LAZY select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS select ARCH_HAS_FAST_MULTIPLIER @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:201 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:818 @ 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-3.18.13-rt10-r7s4/arch/x86/crypto/aesni-intel_glue.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/crypto/aesni-intel_glue.c +++ linux-3.18.13-rt10-r7s4/arch/x86/crypto/aesni-intel_glue.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:384 @ static int ecb_encrypt(struct blkcipher_ err = blkcipher_walk_virt(desc, &walk); desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - 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); + nbytes & AES_BLOCK_MASK); + kernel_fpu_end(); nbytes &= AES_BLOCK_SIZE - 1; err = blkcipher_walk_done(desc, &walk, nbytes); } - kernel_fpu_end(); return err; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:408 @ static int ecb_decrypt(struct blkcipher_ err = blkcipher_walk_virt(desc, &walk); desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - 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 = blkcipher_walk_done(desc, &walk, nbytes); } - kernel_fpu_end(); return err; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:432 @ static int cbc_encrypt(struct blkcipher_ err = blkcipher_walk_virt(desc, &walk); desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - 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 = blkcipher_walk_done(desc, &walk, nbytes); } - kernel_fpu_end(); return err; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:456 @ static int cbc_decrypt(struct blkcipher_ err = blkcipher_walk_virt(desc, &walk); desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - 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 = blkcipher_walk_done(desc, &walk, nbytes); } - kernel_fpu_end(); return err; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:515 @ static int ctr_crypt(struct blkcipher_de err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE); desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; - 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 = blkcipher_walk_done(desc, &walk, nbytes); } if (walk.nbytes) { + kernel_fpu_begin(); ctr_crypt_final(ctx, &walk); + kernel_fpu_end(); err = blkcipher_walk_done(desc, &walk, 0); } - kernel_fpu_end(); return err; } Index: linux-3.18.13-rt10-r7s4/arch/x86/crypto/cast5_avx_glue.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/crypto/cast5_avx_glue.c +++ linux-3.18.13-rt10-r7s4/arch/x86/crypto/cast5_avx_glue.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:63 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:79 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:107 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:230 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:239 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:313 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:322 @ 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-3.18.13-rt10-r7s4/arch/x86/crypto/glue_helper.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/crypto/glue_helper.c +++ linux-3.18.13-rt10-r7s4/arch/x86/crypto/glue_helper.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:42 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:52 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:74 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:197 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:206 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:281 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:290 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:350 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:363 @ 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-3.18.13-rt10-r7s4/arch/x86/include/asm/preempt.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/include/asm/preempt.h +++ linux-3.18.13-rt10-r7s4/arch/x86/include/asm/preempt.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:88 @ 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 + 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(void) { +#ifdef CONFIG_PREEMPT_LAZY + return unlikely(!raw_cpu_read_4(__preempt_count) || \ + test_thread_flag(TIF_NEED_RESCHED_LAZY)); +#else return unlikely(!raw_cpu_read_4(__preempt_count)); +#endif } #ifdef CONFIG_PREEMPT Index: linux-3.18.13-rt10-r7s4/arch/x86/include/asm/signal.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/include/asm/signal.h +++ linux-3.18.13-rt10-r7s4/arch/x86/include/asm/signal.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:26 @ typedef struct { unsigned long sig[_NSIG_WORDS]; } sigset_t; +/* + * 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) && defined(CONFIG_X86_64) +#define ARCH_RT_DELAYS_SIGNAL_SEND +#endif + #ifndef CONFIG_COMPAT typedef sigset_t compat_sigset_t; #endif Index: linux-3.18.13-rt10-r7s4/arch/x86/include/asm/stackprotector.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/include/asm/stackprotector.h +++ linux-3.18.13-rt10-r7s4/arch/x86/include/asm/stackprotector.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:60 @ */ static __always_inline void boot_init_stack_canary(void) { - u64 canary; + u64 uninitialized_var(canary); u64 tsc; #ifdef CONFIG_X86_64 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:71 @ 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 = __native_read_tsc(); canary += tsc + (tsc << 32UL); Index: linux-3.18.13-rt10-r7s4/arch/x86/include/asm/thread_info.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/include/asm/thread_info.h +++ linux-3.18.13-rt10-r7s4/arch/x86/include/asm/thread_info.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:33 @ struct thread_info { __u32 status; /* thread synchronous flags */ __u32 cpu; /* current CPU */ int saved_preempt_count; + int preempt_lazy_count; /* 0 => lazy preemptable + <0 => BUG */ mm_segment_t addr_limit; struct restart_block restart_block; void __user *sysenter_return; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:80 @ 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_MCE_NOTIFY 10 /* notify userspace of an MCE */ #define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */ #define TIF_UPROBE 12 /* breakpointed or singlestepping */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:106 @ 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_MCE_NOTIFY (1 << TIF_MCE_NOTIFY) #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY) #define _TIF_UPROBE (1 << TIF_UPROBE) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:157 @ 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) #define KERNEL_STACK_OFFSET (5*(BITS_PER_LONG/8)) Index: linux-3.18.13-rt10-r7s4/arch/x86/include/asm/uv/uv_bau.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/include/asm/uv/uv_bau.h +++ linux-3.18.13-rt10-r7s4/arch/x86/include/asm/uv/uv_bau.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:618 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:779 @ 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-3.18.13-rt10-r7s4/arch/x86/include/asm/uv/uv_hub.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/include/asm/uv/uv_hub.h +++ linux-3.18.13-rt10-r7s4/arch/x86/include/asm/uv/uv_hub.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:495 @ struct uv_blade_info { unsigned short nr_online_cpus; unsigned short pnode; short memory_nid; - spinlock_t nmi_lock; /* obsolete, see uv_hub_nmi */ + raw_spinlock_t nmi_lock; /* obsolete, see uv_hub_nmi */ unsigned long nmi_count; /* obsolete, see uv_hub_nmi */ }; extern struct uv_blade_info *uv_blade_info; Index: linux-3.18.13-rt10-r7s4/arch/x86/kernel/apic/io_apic.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kernel/apic/io_apic.c +++ linux-3.18.13-rt10-r7s4/arch/x86/kernel/apic/io_apic.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2497 @ static bool io_apic_level_ack_pending(st static inline bool ioapic_irqd_mask(struct irq_data *data, struct irq_cfg *cfg) { /* 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(cfg); return true; } Index: linux-3.18.13-rt10-r7s4/arch/x86/kernel/apic/x2apic_uv_x.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kernel/apic/x2apic_uv_x.c +++ linux-3.18.13-rt10-r7s4/arch/x86/kernel/apic/x2apic_uv_x.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:921 @ void __init uv_system_init(void) uv_blade_info[blade].pnode = pnode; uv_blade_info[blade].nr_possible_cpus = 0; uv_blade_info[blade].nr_online_cpus = 0; - spin_lock_init(&uv_blade_info[blade].nmi_lock); + raw_spin_lock_init(&uv_blade_info[blade].nmi_lock); min_pnode = min(pnode, min_pnode); max_pnode = max(pnode, max_pnode); blade++; Index: linux-3.18.13-rt10-r7s4/arch/x86/kernel/asm-offsets.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kernel/asm-offsets.c +++ linux-3.18.13-rt10-r7s4/arch/x86/kernel/asm-offsets.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:35 @ void common(void) { OFFSET(TI_flags, thread_info, flags); OFFSET(TI_status, thread_info, status); OFFSET(TI_addr_limit, thread_info, addr_limit); + OFFSET(TI_preempt_lazy_count, thread_info, preempt_lazy_count); BLANK(); OFFSET(crypto_tfm_ctx_offset, crypto_tfm, __crt_ctx); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:75 @ void common(void) { BLANK(); DEFINE(PTREGS_SIZE, sizeof(struct pt_regs)); + DEFINE(_PREEMPT_ENABLED, PREEMPT_ENABLED); } Index: linux-3.18.13-rt10-r7s4/arch/x86/kernel/cpu/mcheck/mce.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kernel/cpu/mcheck/mce.c +++ linux-3.18.13-rt10-r7s4/arch/x86/kernel/cpu/mcheck/mce.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:44 @ #include <linux/debugfs.h> #include <linux/irq_work.h> #include <linux/export.h> +#include <linux/jiffies.h> +#include <linux/work-simple.h> #include <asm/processor.h> #include <asm/mce.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1271 @ void mce_log_therm_throt_event(__u64 sta static unsigned long check_interval = 5 * 60; /* 5 minutes */ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1288 @ static int cmc_error_seen(void) return test_and_clear_bit(0, v); } -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); unsigned long iv; int notify; - WARN_ON(smp_processor_id() != data); - if (mce_available(this_cpu_ptr(&cpu_info))) { machine_check_poll(MCP_TIMESTAMP, this_cpu_ptr(&mce_poll_banks)); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1315 @ static void mce_timer_fn(unsigned long d __this_cpu_write(mce_next_interval, iv); /* Might have become 0 after CMCI storm subsided */ if (iv) { - t->expires = jiffies + iv; - add_timer_on(t, smp_processor_id()); + hrtimer_forward_now(timer, ns_to_ktime( + jiffies_to_usecs(iv) * 1000ULL)); + return HRTIMER_RESTART; } + return HRTIMER_NORESTART; } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1327 @ static void mce_timer_fn(unsigned long d */ void mce_timer_kick(unsigned long interval) { - struct timer_list *t = this_cpu_ptr(&mce_timer); - unsigned long when = jiffies + interval; + struct hrtimer *t = this_cpu_ptr(&mce_timer); unsigned long iv = __this_cpu_read(mce_next_interval); - if (timer_pending(t)) { - if (time_before(when, t->expires)) - mod_timer_pinned(t, when); + if (hrtimer_active(t)) { + s64 exp; + s64 intv_us; + + intv_us = jiffies_to_usecs(interval); + exp = ktime_to_us(hrtimer_expires_remaining(t)); + if (intv_us < exp) { + hrtimer_cancel(t); + hrtimer_start_range_ns(t, + ns_to_ktime(intv_us * 1000), + 0, HRTIMER_MODE_REL_PINNED); + } } else { - t->expires = round_jiffies(when); - add_timer_on(t, smp_processor_id()); + hrtimer_start_range_ns(t, + ns_to_ktime(jiffies_to_usecs(interval) * 1000ULL), + 0, HRTIMER_MODE_REL_PINNED); } if (interval < iv) __this_cpu_write(mce_next_interval, interval); } -/* Must not be called in IRQ context where del_timer_sync() can deadlock */ +/* Must not be called in IRQ context where hrtimer_cancel() can deadlock */ 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)); } static void mce_do_trigger(struct work_struct *work) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1367 @ static void mce_do_trigger(struct work_s static DECLARE_WORK(mce_trigger_work, mce_do_trigger); +static void __mce_notify_work(struct swork_event *event) +{ + /* Not more than two messages every minute */ + static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2); + + /* wake processes polling /dev/mcelog */ + wake_up_interruptible(&mce_chrdev_wait); + + /* + * There is no risk of missing notifications because + * work_pending is always cleared before the function is + * executed. + */ + if (mce_helper[0] && !work_pending(&mce_trigger_work)) + schedule_work(&mce_trigger_work); + + if (__ratelimit(&ratelimit)) + pr_info(HW_ERR "Machine check events logged\n"); +} + +#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_notify_work); + notify_work_ready = true; + return 0; +} + +static void mce_notify_work(void) +{ + if (notify_work_ready) + swork_queue(¬ify_work); +} +#else +static void mce_notify_work(void) +{ + __mce_notify_work(NULL); +} +static inline int mce_notify_work_init(void) { return 0; } +#endif + /* * Notify the user(s) about new machine check events. * Can be called from interrupt context, but not from machine check/NMI @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1424 @ static DECLARE_WORK(mce_trigger_work, mc */ int mce_notify_irq(void) { - /* Not more than two messages every minute */ - static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2); - if (test_and_clear_bit(0, &mce_need_notify)) { - /* wake processes polling /dev/mcelog */ - wake_up_interruptible(&mce_chrdev_wait); - - if (mce_helper[0]) - schedule_work(&mce_trigger_work); - - if (__ratelimit(&ratelimit)) - pr_info(HW_ERR "Machine check events logged\n"); - + mce_notify_work(); return 1; } return 0; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1696 @ static void __mcheck_cpu_init_vendor(str } } -static void mce_start_timer(unsigned int cpu, struct timer_list *t) +static void mce_start_timer(unsigned int cpu, struct hrtimer *t) { unsigned long iv = check_interval * HZ; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1705 @ static void mce_start_timer(unsigned int per_cpu(mce_next_interval, cpu) = iv; - t->expires = round_jiffies(jiffies + iv); - add_timer_on(t, cpu); + hrtimer_start_range_ns(t, ns_to_ktime(jiffies_to_usecs(iv) * 1000ULL), + 0, HRTIMER_MODE_REL_PINNED); } static void __mcheck_cpu_init_timer(void) { - struct timer_list *t = this_cpu_ptr(&mce_timer); + struct hrtimer *t = this_cpu_ptr(&mce_timer); unsigned int cpu = smp_processor_id(); - setup_timer(t, mce_timer_fn, cpu); + hrtimer_init(t, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + t->function = mce_timer_fn; mce_start_timer(cpu, t); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2392 @ static void mce_disable_cpu(void *h) if (!mce_available(raw_cpu_ptr(&cpu_info))) return; + hrtimer_cancel(this_cpu_ptr(&mce_timer)); + if (!(action & CPU_TASKS_FROZEN)) cmci_clear(); for (i = 0; i < mca_cfg.banks; i++) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2420 @ static void mce_reenable_cpu(void *h) if (b->init) wrmsrl(MSR_IA32_MCx_CTL(i), b->ctl); } + __mcheck_cpu_init_timer(); } /* Get notified when a cpu comes on/off. Be hotplug friendly. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2428 @ static int mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { unsigned int cpu = (unsigned long)hcpu; - struct timer_list *t = &per_cpu(mce_timer, cpu); switch (action & ~CPU_TASKS_FROZEN) { case CPU_ONLINE: @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2447 @ mce_cpu_callback(struct notifier_block * break; case CPU_DOWN_PREPARE: smp_call_function_single(cpu, mce_disable_cpu, &action, 1); - del_timer_sync(t); break; case CPU_DOWN_FAILED: smp_call_function_single(cpu, mce_reenable_cpu, &action, 1); - mce_start_timer(cpu, t); break; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2488 @ static __init int mcheck_init_device(voi goto err_out; } + err = mce_notify_work_init(); + if (err) + goto err_out; + if (!zalloc_cpumask_var(&mce_device_initialized, GFP_KERNEL)) { err = -ENOMEM; goto err_out; Index: linux-3.18.13-rt10-r7s4/arch/x86/kernel/entry_32.S =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kernel/entry_32.S +++ linux-3.18.13-rt10-r7s4/arch/x86/kernel/entry_32.S @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:362 @ END(ret_from_exception) ENTRY(resume_kernel) DISABLE_INTERRUPTS(CLBR_ANY) need_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 + + cmpl $0,TI_preempt_lazy_count(%ebp) # non-zero preempt_lazy_count ? + jnz restore_all + + testl $_TIF_NEED_RESCHED_LAZY, 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:610 @ ENDPROC(system_call) ALIGN RING0_PTREGS_FRAME # can't unwind into user space anyway work_pending: - testb $_TIF_NEED_RESCHED, %cl + testl $_TIF_NEED_RESCHED_MASK, %ecx jz work_notifysig work_resched: call schedule @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:623 @ work_resched: andl $_TIF_WORK_MASK, %ecx # is there any work to be done other # than syscall tracing? jz restore_all - testb $_TIF_NEED_RESCHED, %cl + testl $_TIF_NEED_RESCHED_MASK, %ecx jnz work_resched work_notifysig: # deal with pending signals and Index: linux-3.18.13-rt10-r7s4/arch/x86/kernel/entry_64.S =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kernel/entry_64.S +++ linux-3.18.13-rt10-r7s4/arch/x86/kernel/entry_64.S @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:457 @ sysret_check: /* Handle reschedules */ /* edx: work, edi: workmask */ sysret_careful: - bt $TIF_NEED_RESCHED,%edx - jnc sysret_signal + testl $_TIF_NEED_RESCHED_MASK,%edx + jz sysret_signal TRACE_IRQS_ON ENABLE_INTERRUPTS(CLBR_NONE) pushq_cfi %rdi @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:557 @ GLOBAL(int_with_check) /* First do a reschedule test. */ /* edx: work, edi: workmask */ int_careful: - bt $TIF_NEED_RESCHED,%edx - jnc int_very_careful + testl $_TIF_NEED_RESCHED_MASK,%edx + jz int_very_careful TRACE_IRQS_ON ENABLE_INTERRUPTS(CLBR_NONE) pushq_cfi %rdi @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:873 @ native_irq_return_ldt: /* edi: workmask, edx: work */ retint_careful: CFI_RESTORE_STATE - bt $TIF_NEED_RESCHED,%edx - jnc retint_signal + testl $_TIF_NEED_RESCHED_MASK,%edx + jz retint_signal TRACE_IRQS_ON ENABLE_INTERRUPTS(CLBR_NONE) pushq_cfi %rdi @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:906 @ retint_signal: /* rcx: threadinfo. interrupts off. */ ENTRY(retint_kernel) cmpl $0,PER_CPU_VAR(__preempt_count) +#ifndef CONFIG_PREEMPT_LAZY jnz retint_restore_args +#else + jz check_int_off + + # atleast preempt count == 0 ? + cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count) + jnz retint_restore_args + + cmpl $0, TI_preempt_lazy_count(%rcx) + jnz retint_restore_args + + bt $TIF_NEED_RESCHED_LAZY,TI_flags(%rcx) + jnc retint_restore_args +check_int_off: +#endif bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */ jnc retint_restore_args call preempt_schedule_irq @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1137 @ bad_gs: jmp 2b .previous +#ifndef CONFIG_PREEMPT_RT_FULL /* Call softirq on interrupt stack. Interrupts are off. */ ENTRY(do_softirq_own_stack) CFI_STARTPROC @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1157 @ ENTRY(do_softirq_own_stack) ret CFI_ENDPROC END(do_softirq_own_stack) +#endif #ifdef CONFIG_XEN idtentry xen_hypervisor_callback xen_do_hypervisor_callback has_error_code=0 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1322 @ paranoid_userspace: movq %rsp,%rdi /* &pt_regs */ call sync_regs movq %rax,%rsp /* switch stack for scheduling */ - testl $_TIF_NEED_RESCHED,%ebx + testl $_TIF_NEED_RESCHED_MASK,%ebx jnz paranoid_schedule movl %ebx,%edx /* arg3: thread flags */ TRACE_IRQS_ON Index: linux-3.18.13-rt10-r7s4/arch/x86/kernel/irq_32.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kernel/irq_32.c +++ linux-3.18.13-rt10-r7s4/arch/x86/kernel/irq_32.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:145 @ 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 thread_info *curstk; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:164 @ void do_softirq_own_stack(void) call_on_stack(__do_softirq, isp); } +#endif bool handle_irq(unsigned irq, struct pt_regs *regs) { Index: linux-3.18.13-rt10-r7s4/arch/x86/kernel/process_32.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kernel/process_32.c +++ linux-3.18.13-rt10-r7s4/arch/x86/kernel/process_32.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:38 @ #include <linux/uaccess.h> #include <linux/io.h> #include <linux/kdebug.h> +#include <linux/highmem.h> #include <asm/pgtable.h> #include <asm/ldt.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:218 @ 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. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:334 @ __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-3.18.13-rt10-r7s4/arch/x86/kernel/signal.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kernel/signal.c +++ linux-3.18.13-rt10-r7s4/arch/x86/kernel/signal.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:749 @ do_notify_resume(struct pt_regs *regs, v mce_notify_process(); #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */ +#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 (thread_info_flags & _TIF_UPROBE) uprobe_notify_resume(regs); Index: linux-3.18.13-rt10-r7s4/arch/x86/kernel/traps.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kernel/traps.c +++ linux-3.18.13-rt10-r7s4/arch/x86/kernel/traps.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:90 @ static inline void conditional_sti(struc local_irq_enable(); } -static inline void preempt_conditional_sti(struct pt_regs *regs) +static inline void conditional_sti_ist(struct pt_regs *regs) { +#ifdef CONFIG_X86_64 + /* + * X86_64 uses a per CPU stack on the IST for certain traps + * like int3. The task can not be preempted when using one + * of these stacks, thus preemption must be disabled, otherwise + * the stack can be corrupted if the task is scheduled out, + * and another task comes in and uses this stack. + * + * On x86_32 the task keeps its own stack and it is OK if the + * task schedules out. + */ preempt_count_inc(); +#endif if (regs->flags & X86_EFLAGS_IF) local_irq_enable(); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:115 @ static inline void conditional_cli(struc local_irq_disable(); } -static inline void preempt_conditional_cli(struct pt_regs *regs) +static inline void conditional_cli_ist(struct pt_regs *regs) { if (regs->flags & X86_EFLAGS_IF) local_irq_disable(); +#ifdef CONFIG_X86_64 preempt_count_dec(); +#endif } static nokprobe_inline int @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:389 @ dotraplinkage void notrace do_int3(struc * as we may switch to the interrupt stack. */ debug_stack_usage_inc(); - preempt_conditional_sti(regs); + conditional_sti_ist(regs); do_trap(X86_TRAP_BP, SIGTRAP, "int3", regs, error_code, NULL); - preempt_conditional_cli(regs); + conditional_cli_ist(regs); debug_stack_usage_dec(); exit: exception_exit(prev_state); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:534 @ dotraplinkage void do_debug(struct pt_re debug_stack_usage_inc(); /* It's safe to allow irq's after DR6 has been saved */ - preempt_conditional_sti(regs); + conditional_sti_ist(regs); if (regs->flags & X86_VM_MASK) { handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, X86_TRAP_DB); - preempt_conditional_cli(regs); + conditional_cli_ist(regs); debug_stack_usage_dec(); goto exit; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:559 @ dotraplinkage void do_debug(struct pt_re si_code = get_si_code(tsk->thread.debugreg6); if (tsk->thread.debugreg6 & (DR_STEP | DR_TRAP_BITS) || user_icebp) send_sigtrap(tsk, regs, error_code, si_code); - preempt_conditional_cli(regs); + conditional_cli_ist(regs); debug_stack_usage_dec(); exit: Index: linux-3.18.13-rt10-r7s4/arch/x86/kvm/lapic.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kvm/lapic.c +++ linux-3.18.13-rt10-r7s4/arch/x86/kvm/lapic.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1037 @ static void update_divide_count(struct k apic->divide_count); } + +static enum hrtimer_restart apic_timer_fn(struct hrtimer *data); + +static void apic_timer_expired(struct hrtimer *data) +{ + int ret, i = 0; + enum hrtimer_restart r; + struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer); + + r = apic_timer_fn(data); + + if (r == HRTIMER_RESTART) { + do { + ret = hrtimer_start_expires(data, HRTIMER_MODE_ABS); + if (ret == -ETIME) + hrtimer_add_expires_ns(&ktimer->timer, + ktimer->period); + i++; + } while (ret == -ETIME && i < 10); + + if (ret == -ETIME) { + printk_once(KERN_ERR "%s: failed to reprogram timer\n", + __func__); + WARN_ON_ONCE(1); + } + } +} + + static void start_apic_timer(struct kvm_lapic *apic) { + int ret; ktime_t now; atomic_set(&apic->lapic_timer.pending, 0); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1098 @ static void start_apic_timer(struct kvm_ } } - hrtimer_start(&apic->lapic_timer.timer, + ret = hrtimer_start(&apic->lapic_timer.timer, ktime_add_ns(now, apic->lapic_timer.period), HRTIMER_MODE_ABS); + if (ret == -ETIME) + apic_timer_expired(&apic->lapic_timer.timer); apic_debug("%s: bus cycle is %" PRId64 "ns, now 0x%016" PRIx64 ", " @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1132 @ static void start_apic_timer(struct kvm_ ns = (tscdeadline - guest_tsc) * 1000000ULL; do_div(ns, this_tsc_khz); } - hrtimer_start(&apic->lapic_timer.timer, + ret = hrtimer_start(&apic->lapic_timer.timer, ktime_add_ns(now, ns), HRTIMER_MODE_ABS); + if (ret == -ETIME) + apic_timer_expired(&apic->lapic_timer.timer); local_irq_restore(flags); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1576 @ static enum hrtimer_restart apic_timer_f struct kvm_timer *ktimer = container_of(data, struct kvm_timer, timer); struct kvm_lapic *apic = container_of(ktimer, struct kvm_lapic, lapic_timer); struct kvm_vcpu *vcpu = apic->vcpu; - wait_queue_head_t *q = &vcpu->wq; + struct swait_head *q = &vcpu->wq; /* * There is a race window between reading and incrementing, but we do @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1590 @ static enum hrtimer_restart apic_timer_f kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu); } - if (waitqueue_active(q)) - wake_up_interruptible(q); + if (swaitqueue_active(q)) + swait_wake_interruptible(q); if (lapic_is_periodic(apic)) { hrtimer_add_expires_ns(&ktimer->timer, ktimer->period); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1624 @ int kvm_create_lapic(struct kvm_vcpu *vc hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); apic->lapic_timer.timer.function = apic_timer_fn; + apic->lapic_timer.timer.irqsafe = 1; /* * APIC is created enabled. This will prevent kvm_lapic_set_base from @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1745 @ void __kvm_migrate_apic_timer(struct kvm timer = &vcpu->arch.apic->lapic_timer.timer; if (hrtimer_cancel(timer)) - hrtimer_start_expires(timer, HRTIMER_MODE_ABS); + if (hrtimer_start_expires(timer, HRTIMER_MODE_ABS) == -ETIME) + apic_timer_expired(timer); } /* Index: linux-3.18.13-rt10-r7s4/arch/x86/kvm/x86.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/kvm/x86.c +++ linux-3.18.13-rt10-r7s4/arch/x86/kvm/x86.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:5775 @ 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-3.18.13-rt10-r7s4/arch/x86/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/x86/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1131 @ __do_page_fault(struct pt_regs *regs, un * If we're in an interrupt, have no user context or are running * in an atomic region then we must not take the fault: */ - if (unlikely(in_atomic() || !mm)) { + if (unlikely(!mm || pagefault_disabled())) { bad_area_nosemaphore(regs, error_code, address); return; } Index: linux-3.18.13-rt10-r7s4/arch/x86/mm/highmem_32.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/mm/highmem_32.c +++ linux-3.18.13-rt10-r7s4/arch/x86/mm/highmem_32.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:35 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:49 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:95 @ 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(); Index: linux-3.18.13-rt10-r7s4/arch/x86/mm/iomap_32.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/mm/iomap_32.c +++ linux-3.18.13-rt10-r7s4/arch/x86/mm/iomap_32.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:59 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:68 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:119 @ 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-3.18.13-rt10-r7s4/arch/x86/platform/uv/tlb_uv.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/platform/uv/tlb_uv.c +++ linux-3.18.13-rt10-r7s4/arch/x86/platform/uv/tlb_uv.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:717 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:739 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:762 @ 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(); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:775 @ 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, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:838 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:971 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:983 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1902 @ 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-3.18.13-rt10-r7s4/arch/x86/platform/uv/uv_time.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/x86/platform/uv/uv_time.c +++ linux-3.18.13-rt10-r7s4/arch/x86/platform/uv/uv_time.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:61 @ 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: */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:181 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:235 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:247 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:271 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:283 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:303 @ static int uv_rtc_unset_timer(int cpu, i static cycle_t uv_read_rtc(struct clocksource *cs) { unsigned long offset; + cycle_t 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 (cycle_t)uv_read_local_mmr(UVH_RTC | offset); + cycles = (cycle_t)uv_read_local_mmr(UVH_RTC | offset); + preempt_enable(); + + return cycles; } /* Index: linux-3.18.13-rt10-r7s4/arch/xtensa/mm/fault.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/arch/xtensa/mm/fault.c +++ linux-3.18.13-rt10-r7s4/arch/xtensa/mm/fault.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:60 @ void do_page_fault(struct pt_regs *regs) /* If we're in an interrupt or have no user * context, we must not take the fault.. */ - if (in_atomic() || !mm) { + if (!mm || pagefault_disabled()) { bad_page_fault(regs, address, SIGSEGV); return; } Index: linux-3.18.13-rt10-r7s4/block/blk-core.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/block/blk-core.c +++ linux-3.18.13-rt10-r7s4/block/blk-core.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:103 @ void blk_rq_init(struct request_queue *q INIT_LIST_HEAD(&rq->queuelist); INIT_LIST_HEAD(&rq->timeout_list); +#if 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:200 @ EXPORT_SYMBOL(blk_delay_queue); **/ void blk_start_queue(struct request_queue *q) { - WARN_ON(!irqs_disabled()); + WARN_ON_NONRT(!irqs_disabled()); queue_flag_clear(QUEUE_FLAG_STOPPED, q); __blk_run_queue(q); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:633 @ struct request_queue *blk_alloc_queue_no q->bypass_depth = 1; __set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags); - init_waitqueue_head(&q->mq_freeze_wq); + init_swait_head(&q->mq_freeze_wq); if (blkcg_init_queue(q)) goto fail_bdi; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3043 @ 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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3091 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3110 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3122 @ 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); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3149 @ 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) Index: linux-3.18.13-rt10-r7s4/block/blk-ioc.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/block/blk-ioc.c +++ linux-3.18.13-rt10-r7s4/block/blk-ioc.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:10 @ #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/slab.h> +#include <linux/delay.h> #include "blk.h" @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:113 @ 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); } } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:191 @ retry: spin_unlock(icq->q->queue_lock); } else { spin_unlock_irqrestore(&ioc->lock, flags); - cpu_relax(); + cpu_chill(); goto retry; } } Index: linux-3.18.13-rt10-r7s4/block/blk-iopoll.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/block/blk-iopoll.c +++ linux-3.18.13-rt10-r7s4/block/blk-iopoll.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:38 @ void blk_iopoll_sched(struct blk_iopoll list_add_tail(&iop->list, this_cpu_ptr(&blk_cpu_iopoll)); __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ); local_irq_restore(flags); + preempt_check_resched_rt(); } EXPORT_SYMBOL(blk_iopoll_sched); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:136 @ static void blk_iopoll_softirq(struct so __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ); local_irq_enable(); + preempt_check_resched_rt(); } /** @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:206 @ static int blk_iopoll_cpu_notify(struct this_cpu_ptr(&blk_cpu_iopoll)); __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ); local_irq_enable(); + preempt_check_resched_rt(); } return NOTIFY_OK; Index: linux-3.18.13-rt10-r7s4/block/blk-mq-cpu.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/block/blk-mq-cpu.c +++ linux-3.18.13-rt10-r7s4/block/blk-mq-cpu.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:19 @ #include "blk-mq.h" static LIST_HEAD(blk_mq_cpu_notify_list); -static DEFINE_RAW_SPINLOCK(blk_mq_cpu_notify_lock); +static DEFINE_SPINLOCK(blk_mq_cpu_notify_lock); static int blk_mq_main_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:28 @ static int blk_mq_main_cpu_notify(struct struct blk_mq_cpu_notifier *notify; int ret = NOTIFY_OK; - raw_spin_lock(&blk_mq_cpu_notify_lock); + if (action != CPU_POST_DEAD) + return NOTIFY_OK; + + spin_lock(&blk_mq_cpu_notify_lock); list_for_each_entry(notify, &blk_mq_cpu_notify_list, list) { ret = notify->notify(notify->data, action, cpu); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:39 @ static int blk_mq_main_cpu_notify(struct break; } - raw_spin_unlock(&blk_mq_cpu_notify_lock); + spin_unlock(&blk_mq_cpu_notify_lock); return ret; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:47 @ void blk_mq_register_cpu_notifier(struct { BUG_ON(!notifier->notify); - raw_spin_lock(&blk_mq_cpu_notify_lock); + spin_lock(&blk_mq_cpu_notify_lock); list_add_tail(¬ifier->list, &blk_mq_cpu_notify_list); - raw_spin_unlock(&blk_mq_cpu_notify_lock); + spin_unlock(&blk_mq_cpu_notify_lock); } void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier) { - raw_spin_lock(&blk_mq_cpu_notify_lock); + spin_lock(&blk_mq_cpu_notify_lock); list_del(¬ifier->list); - raw_spin_unlock(&blk_mq_cpu_notify_lock); + spin_unlock(&blk_mq_cpu_notify_lock); } void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier, Index: linux-3.18.13-rt10-r7s4/block/blk-mq.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/block/blk-mq.c +++ linux-3.18.13-rt10-r7s4/block/blk-mq.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:88 @ static int blk_mq_queue_enter(struct req if (percpu_ref_tryget_live(&q->mq_usage_counter)) return 0; - ret = wait_event_interruptible(q->mq_freeze_wq, + ret = swait_event_interruptible(q->mq_freeze_wq, !q->mq_freeze_depth || blk_queue_dying(q)); if (blk_queue_dying(q)) return -ENODEV; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:107 @ static void blk_mq_usage_counter_release struct request_queue *q = container_of(ref, struct request_queue, mq_usage_counter); - wake_up_all(&q->mq_freeze_wq); + swait_wake_all(&q->mq_freeze_wq); } static void blk_mq_freeze_queue_start(struct request_queue *q) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:126 @ static void blk_mq_freeze_queue_start(st static void blk_mq_freeze_queue_wait(struct request_queue *q) { - wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->mq_usage_counter)); + swait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->mq_usage_counter)); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:149 @ static void blk_mq_unfreeze_queue(struct spin_unlock_irq(q->queue_lock); if (wake) { percpu_ref_reinit(&q->mq_usage_counter); - wake_up_all(&q->mq_freeze_wq); + swait_wake_all(&q->mq_freeze_wq); } } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:197 @ static void blk_mq_rq_ctx_init(struct re rq->resid_len = 0; rq->sense = NULL; +#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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:319 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:337 @ static void __blk_mq_complete_request_re rq->q->softirq_done_fn(rq); } +#endif + static void blk_mq_ipi_complete_request(struct request *rq) { struct blk_mq_ctx *ctx = rq->mq_ctx; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:350 @ static void blk_mq_ipi_complete_request( 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 + 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(); } void __blk_mq_complete_request(struct request *rq) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:837 @ void blk_mq_run_queues(struct request_qu test_bit(BLK_MQ_S_STOPPED, &hctx->state)) continue; - preempt_disable(); + migrate_disable(); blk_mq_run_hw_queue(hctx, async); - preempt_enable(); + migrate_enable(); } } EXPORT_SYMBOL(blk_mq_run_queues); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:866 @ void blk_mq_start_hw_queue(struct blk_mq { clear_bit(BLK_MQ_S_STOPPED, &hctx->state); - preempt_disable(); + migrate_disable(); blk_mq_run_hw_queue(hctx, false); - preempt_enable(); + migrate_enable(); } EXPORT_SYMBOL(blk_mq_start_hw_queue); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:893 @ void blk_mq_start_stopped_hw_queues(stru continue; clear_bit(BLK_MQ_S_STOPPED, &hctx->state); - preempt_disable(); + migrate_disable(); blk_mq_run_hw_queue(hctx, async); - preempt_enable(); + migrate_enable(); } } EXPORT_SYMBOL(blk_mq_start_stopped_hw_queues); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1517 @ static int blk_mq_hctx_notify(void *data { struct blk_mq_hw_ctx *hctx = data; - if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) + if (action == CPU_POST_DEAD) return blk_mq_hctx_cpu_offline(hctx, cpu); else if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN) return blk_mq_hctx_cpu_online(hctx, cpu); Index: linux-3.18.13-rt10-r7s4/block/blk-mq.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/block/blk-mq.h +++ linux-3.18.13-rt10-r7s4/block/blk-mq.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:76 @ struct blk_align_bitmap { static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q, unsigned int cpu) { - return per_cpu_ptr(q->queue_ctx, cpu); + struct blk_mq_ctx *ctx; + + ctx = per_cpu_ptr(q->queue_ctx, cpu); + return ctx; } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:90 @ 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-3.18.13-rt10-r7s4/block/blk-softirq.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/block/blk-softirq.c +++ linux-3.18.13-rt10-r7s4/block/blk-softirq.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:54 @ static void trigger_softirq(void *data) raise_softirq_irqoff(BLOCK_SOFTIRQ); local_irq_restore(flags); + preempt_check_resched_rt(); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:97 @ static int blk_cpu_notify(struct notifie this_cpu_ptr(&blk_cpu_done)); raise_softirq_irqoff(BLOCK_SOFTIRQ); local_irq_enable(); + preempt_check_resched_rt(); } return NOTIFY_OK; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:155 @ do_local: goto do_local; local_irq_restore(flags); + preempt_check_resched_rt(); } /** Index: linux-3.18.13-rt10-r7s4/block/bounce.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/block/bounce.c +++ linux-3.18.13-rt10-r7s4/block/bounce.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:57 @ 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-3.18.13-rt10-r7s4/crypto/algapi.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/crypto/algapi.c +++ linux-3.18.13-rt10-r7s4/crypto/algapi.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:701 @ 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-3.18.13-rt10-r7s4/crypto/api.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/crypto/api.c +++ linux-3.18.13-rt10-r7s4/crypto/api.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:34 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:239 @ 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-3.18.13-rt10-r7s4/crypto/internal.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/crypto/internal.h +++ linux-3.18.13-rt10-r7s4/crypto/internal.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:51 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:145 @ 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-3.18.13-rt10-r7s4/drivers/acpi/acpica/acglobal.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/acpi/acpica/acglobal.h +++ linux-3.18.13-rt10-r7s4/drivers/acpi/acpica/acglobal.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:115 @ 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-3.18.13-rt10-r7s4/drivers/acpi/acpica/hwregs.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/acpi/acpica/hwregs.c +++ linux-3.18.13-rt10-r7s4/drivers/acpi/acpica/hwregs.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:272 @ 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-3.18.13-rt10-r7s4/drivers/acpi/acpica/hwxface.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/acpi/acpica/hwxface.c +++ linux-3.18.13-rt10-r7s4/drivers/acpi/acpica/hwxface.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:377 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:438 @ 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-3.18.13-rt10-r7s4/drivers/acpi/acpica/utmutex.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/acpi/acpica/utmutex.c +++ linux-3.18.13-rt10-r7s4/drivers/acpi/acpica/utmutex.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:91 @ 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); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:144 @ 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-3.18.13-rt10-r7s4/drivers/ata/libata-sff.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/ata/libata-sff.c +++ linux-3.18.13-rt10-r7s4/drivers/ata/libata-sff.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:681 @ 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(dev, buf, buflen, rw); - local_irq_restore(flags); + local_irq_restore_nort(flags); return consumed; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:722 @ static void ata_pio_sector(struct ata_qu unsigned long flags; /* FIXME: use a bounce buffer */ - local_irq_save(flags); + local_irq_save_nort(flags); buf = kmap_atomic(page); /* do the actual data transfer */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:730 @ static void ata_pio_sector(struct ata_qu do_write); kunmap_atomic(buf); - local_irq_restore(flags); + local_irq_restore_nort(flags); } else { buf = page_address(page); ap->ops->sff_data_xfer(qc->dev, buf + offset, qc->sect_size, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:867 @ next_sg: unsigned long flags; /* FIXME: use bounce buffer */ - local_irq_save(flags); + local_irq_save_nort(flags); buf = kmap_atomic(page); /* do the actual data transfer */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:875 @ next_sg: count, rw); kunmap_atomic(buf); - local_irq_restore(flags); + local_irq_restore_nort(flags); } else { buf = page_address(page); consumed = ap->ops->sff_data_xfer(dev, buf + offset, Index: linux-3.18.13-rt10-r7s4/drivers/char/random.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/char/random.c +++ linux-3.18.13-rt10-r7s4/drivers/char/random.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:779 @ static void add_timer_randomness(struct } sample; long delta, delta2, delta3; - preempt_disable(); - sample.jiffies = jiffies; sample.cycles = random_get_entropy(); sample.num = num; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:819 @ 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, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:871 @ static __u32 get_reg(struct fast_pool *f return *(ptr + f->reg_idx++); } -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); Index: linux-3.18.13-rt10-r7s4/drivers/clocksource/tcb_clksrc.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/clocksource/tcb_clksrc.c +++ linux-3.18.13-rt10-r7s4/drivers/clocksource/tcb_clksrc.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:27 @ * 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:85 @ static struct clocksource clksrc = { struct tc_clkevt_device { struct clock_event_device clkevt; struct clk *clk; + u32 freq; void __iomem *regs; }; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:94 @ 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_mode(enum clock_event_mode m, struct clock_event_device *d) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:116 @ static void tc_mode(enum clock_event_mod case CLOCK_EVT_MODE_PERIODIC: clk_enable(tcd->clk); - /* slow clock, count up to RC, then irq and restart */ + /* count up to RC, then irq and restart */ __raw_writel(timer_clock | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO, regs + ATMEL_TC_REG(2, CMR)); - __raw_writel((32768 + HZ/2) / HZ, tcaddr + ATMEL_TC_REG(2, RC)); + __raw_writel((tcd->freq + HZ / 2) / HZ, + tcaddr + ATMEL_TC_REG(2, RC)); /* Enable clock and interrupts on RC compare */ __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER)); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:134 @ static void tc_mode(enum clock_event_mod case CLOCK_EVT_MODE_ONESHOT: clk_enable(tcd->clk); - /* slow clock, count up to RC, then irq and stop */ + /* count up to RC, then irq and stop */ __raw_writel(timer_clock | ATMEL_TC_CPCSTOP | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO, regs + ATMEL_TC_REG(2, CMR)); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:163 @ static struct tc_clkevt_device clkevt = .name = "tc_clkevt", .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, +#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK /* Should be lower than at91rm9200's system timer */ .rating = 125, +#else + .rating = 200, +#endif .set_next_event = tc_next_event, .set_mode = tc_mode, }, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:188 @ 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]; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:204 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:218 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:361 @ static int __init tcb_clksrc_init(void) local_irq_restore(flags); /* 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-3.18.13-rt10-r7s4/drivers/clocksource/timer-atmel-pit.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/clocksource/timer-atmel-pit.c +++ linux-3.18.13-rt10-r7s4/drivers/clocksource/timer-atmel-pit.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:93 @ static cycle_t read_pit_clk(struct clock return elapsed; } +static struct irqaction at91sam926x_pit_irq; /* * Clockevent device: interrupts every 1/HZ (== pit_cycles * MCK/16) */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:104 @ pit_clkevt_mode(enum clock_event_mode mo switch (mode) { case CLOCK_EVT_MODE_PERIODIC: + /* Set up irq handler */ + setup_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq); /* update clocksource counter */ data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR)); pit_write(data->base, AT91_PIT_MR, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:119 @ pit_clkevt_mode(enum clock_event_mode mo /* disable irq, leaving the clocksource active */ pit_write(data->base, AT91_PIT_MR, (data->cycle - 1) | AT91_PIT_PITEN); + remove_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq); break; case CLOCK_EVT_MODE_RESUME: break; Index: linux-3.18.13-rt10-r7s4/drivers/cpufreq/Kconfig.x86 =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/cpufreq/Kconfig.x86 +++ linux-3.18.13-rt10-r7s4/drivers/cpufreq/Kconfig.x86 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:116 @ 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-3.18.13-rt10-r7s4/drivers/gpio/gpio-omap.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/gpio/gpio-omap.c +++ linux-3.18.13-rt10-r7s4/drivers/gpio/gpio-omap.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:60 @ struct gpio_bank { u32 saved_datain; u32 level_mask; u32 toggle_mask; - spinlock_t lock; + raw_spinlock_t lock; struct gpio_chip chip; struct clk *dbck; u32 mod_usage; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:506 @ static int omap_gpio_irq_type(struct irq (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH))) return -EINVAL; - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); offset = GPIO_INDEX(bank, gpio); retval = omap_set_gpio_triggering(bank, offset, type); if (!LINE_USED(bank->mod_usage, offset)) { omap_enable_gpio_module(bank, offset); omap_set_gpio_direction(bank, offset, 1); } else if (!omap_gpio_is_input(bank, BIT(offset))) { - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return -EINVAL; } bank->irq_usage |= BIT(GPIO_INDEX(bank, gpio)); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) __irq_set_handler_locked(d->irq, handle_level_irq); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:636 @ static int omap_set_gpio_wakeup(struct g return -EINVAL; } - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); if (enable) bank->context.wake_en |= gpio_bit; else bank->context.wake_en &= ~gpio_bit; writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:678 @ static int omap_gpio_request(struct gpio if (!BANK_USED(bank)) pm_runtime_get_sync(bank->dev); - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); /* Set trigger to none. You need to enable the desired trigger with * request_irq() or set_irq_type(). Only do this if the IRQ line has * not already been requested. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:688 @ static int omap_gpio_request(struct gpio omap_enable_gpio_module(bank, offset); } bank->mod_usage |= BIT(offset); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:698 @ static void omap_gpio_free(struct gpio_c struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip); unsigned long flags; - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); bank->mod_usage &= ~(BIT(offset)); omap_disable_gpio_module(bank, offset); omap_reset_gpio(bank, bank->chip.base + offset); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); /* * If this is the last gpio to be freed in the bank, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:802 @ static void omap_gpio_irq_shutdown(struc unsigned long flags; unsigned offset = GPIO_INDEX(bank, gpio); - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); gpiochip_unlock_as_irq(&bank->chip, offset); bank->irq_usage &= ~(BIT(offset)); omap_disable_gpio_module(bank, offset); omap_reset_gpio(bank, gpio); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); /* * If this is the last IRQ to be freed in the bank, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:831 @ static void omap_gpio_mask_irq(struct ir unsigned int gpio = omap_irq_to_gpio(bank, d->hwirq); unsigned long flags; - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); omap_set_gpio_irqenable(bank, gpio, 0); omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); } static void omap_gpio_unmask_irq(struct irq_data *d) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:845 @ static void omap_gpio_unmask_irq(struct u32 trigger = irqd_get_trigger_type(d); unsigned long flags; - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); if (trigger) omap_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:857 @ static void omap_gpio_unmask_irq(struct } omap_set_gpio_irqenable(bank, gpio, 1); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); } /*---------------------------------------------------------------------*/ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:870 @ static int omap_mpuio_suspend_noirq(stru OMAP_MPUIO_GPIO_MASKIT / bank->stride; unsigned long flags; - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); writel_relaxed(0xffff & ~bank->context.wake_en, mask_reg); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:885 @ static int omap_mpuio_resume_noirq(struc OMAP_MPUIO_GPIO_MASKIT / bank->stride; unsigned long flags; - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); writel_relaxed(bank->context.wake_en, mask_reg); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:933 @ static int omap_gpio_get_direction(struc bank = container_of(chip, struct gpio_bank, chip); reg = bank->base + bank->regs->direction; - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); dir = !!(readl_relaxed(reg) & BIT(offset)); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return dir; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:945 @ static int omap_gpio_input(struct gpio_c unsigned long flags; bank = container_of(chip, struct gpio_bank, chip); - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); omap_set_gpio_direction(bank, offset, 1); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:971 @ static int omap_gpio_output(struct gpio_ unsigned long flags; bank = container_of(chip, struct gpio_bank, chip); - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); bank->set_dataout(bank, offset, value); omap_set_gpio_direction(bank, offset, 0); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:986 @ static int omap_gpio_debounce(struct gpi bank = container_of(chip, struct gpio_bank, chip); - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); omap2_set_gpio_debounce(bank, offset, debounce); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:999 @ static void omap_gpio_set(struct gpio_ch unsigned long flags; bank = container_of(chip, struct gpio_bank, chip); - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); bank->set_dataout(bank, offset, value); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); } /*---------------------------------------------------------------------*/ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1226 @ static int omap_gpio_probe(struct platfo else bank->set_dataout = omap_set_gpio_dataout_mask; - spin_lock_init(&bank->lock); + raw_spin_lock_init(&bank->lock); /* Static mapping, never released */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1273 @ static int omap_gpio_runtime_suspend(str unsigned long flags; u32 wake_low, wake_hi; - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); /* * Only edges can generate a wakeup event to the PRCM. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1326 @ update_gpio_context_count: bank->get_context_loss_count(bank->dev); omap_gpio_dbck_disable(bank); - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1341 @ static int omap_gpio_runtime_resume(stru unsigned long flags; int c; - spin_lock_irqsave(&bank->lock, flags); + raw_spin_lock_irqsave(&bank->lock, flags); /* * On the first resume during the probe, the context has not @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1377 @ static int omap_gpio_runtime_resume(stru if (c != bank->context_loss_count) { omap_gpio_restore_context(bank); } else { - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } } } if (!bank->workaround_enabled) { - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1439 @ static int omap_gpio_runtime_resume(stru } bank->workaround_enabled = false; - spin_unlock_irqrestore(&bank->lock, flags); + raw_spin_unlock_irqrestore(&bank->lock, flags); return 0; } Index: linux-3.18.13-rt10-r7s4/drivers/gpu/drm/i915/i915_gem.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/gpu/drm/i915/i915_gem.c +++ linux-3.18.13-rt10-r7s4/drivers/gpu/drm/i915/i915_gem.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:5147 @ static bool mutex_is_locked_by(struct mu if (!mutex_is_locked(mutex)) return false; -#if defined(CONFIG_SMP) && !defined(CONFIG_DEBUG_MUTEXES) +#if defined(CONFIG_SMP) && !defined(CONFIG_DEBUG_MUTEXES) && !defined(CONFIG_PREEMPT_RT_BASE) return mutex->owner == task; #else /* Since UP may be pre-empted, we cannot assume that we own the lock */ Index: linux-3.18.13-rt10-r7s4/drivers/gpu/drm/i915/i915_gem_execbuffer.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ linux-3.18.13-rt10-r7s4/drivers/gpu/drm/i915/i915_gem_execbuffer.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1173 @ i915_gem_ringbuffer_submission(struct dr return ret; } +#ifndef CONFIG_PREEMPT_RT_BASE trace_i915_gem_ring_dispatch(ring, intel_ring_get_seqno(ring), flags); +#endif i915_gem_execbuffer_move_to_active(vmas, ring); i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj); Index: linux-3.18.13-rt10-r7s4/drivers/i2c/busses/i2c-omap.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/i2c/busses/i2c-omap.c +++ linux-3.18.13-rt10-r7s4/drivers/i2c/busses/i2c-omap.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:878 @ omap_i2c_isr(int irq, void *dev_id) u16 mask; u16 stat; - spin_lock(&dev->lock); - mask = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); + mask = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); if (stat & mask) ret = IRQ_WAKE_THREAD; - spin_unlock(&dev->lock); - return ret; } Index: linux-3.18.13-rt10-r7s4/drivers/ide/alim15x3.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/ide/alim15x3.c +++ linux-3.18.13-rt10-r7s4/drivers/ide/alim15x3.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:237 @ 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) { /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:328 @ out: } pci_dev_put(north); pci_dev_put(isa_dev); - local_irq_restore(flags); + local_irq_restore_nort(flags); return 0; } Index: linux-3.18.13-rt10-r7s4/drivers/ide/hpt366.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/ide/hpt366.c +++ linux-3.18.13-rt10-r7s4/drivers/ide/hpt366.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1244 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1255 @ 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-3.18.13-rt10-r7s4/drivers/ide/ide-io-std.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/ide/ide-io-std.c +++ linux-3.18.13-rt10-r7s4/drivers/ide/ide-io-std.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:178 @ 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); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:189 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:222 @ 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); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:233 @ 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-3.18.13-rt10-r7s4/drivers/ide/ide-io.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/ide/ide-io.c +++ linux-3.18.13-rt10-r7s4/drivers/ide/ide-io.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:662 @ 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-3.18.13-rt10-r7s4/drivers/ide/ide-iops.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/ide/ide-iops.c +++ linux-3.18.13-rt10-r7s4/drivers/ide/ide-iops.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:132 @ 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-3.18.13-rt10-r7s4/drivers/ide/ide-probe.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/ide/ide-probe.c +++ linux-3.18.13-rt10-r7s4/drivers/ide/ide-probe.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:199 @ 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-3.18.13-rt10-r7s4/drivers/ide/ide-taskfile.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/ide/ide-taskfile.c +++ linux-3.18.13-rt10-r7s4/drivers/ide/ide-taskfile.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:253 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:274 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:417 @ 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-3.18.13-rt10-r7s4/drivers/infiniband/ulp/ipoib/ipoib_multicast.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/infiniband/ulp/ipoib/ipoib_multicast.c +++ linux-3.18.13-rt10-r7s4/drivers/infiniband/ulp/ipoib/ipoib_multicast.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:799 @ void ipoib_mcast_restart_task(struct wor ipoib_mcast_stop_thread(dev, 0); - local_irq_save(flags); + local_irq_save_nort(flags); netif_addr_lock(dev); spin_lock(&priv->lock); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:881 @ void ipoib_mcast_restart_task(struct wor spin_unlock(&priv->lock); netif_addr_unlock(dev); - local_irq_restore(flags); + local_irq_restore_nort(flags); /* We have to cancel outside of the spinlock */ list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { Index: linux-3.18.13-rt10-r7s4/drivers/input/gameport/gameport.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/input/gameport/gameport.c +++ linux-3.18.13-rt10-r7s4/drivers/input/gameport/gameport.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:127 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:151 @ 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); rdtscl(t1); for (t = 0; t < 50; t++) gameport_read(gameport); rdtscl(t2); - local_irq_restore(flags); + local_irq_restore_nort(flags); udelay(i * 10); if (t2 - t1 < tx) tx = t2 - t1; } Index: linux-3.18.13-rt10-r7s4/drivers/leds/trigger/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/leds/trigger/Kconfig +++ linux-3.18.13-rt10-r7s4/drivers/leds/trigger/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:64 @ 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-3.18.13-rt10-r7s4/drivers/md/bcache/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/md/bcache/Kconfig +++ linux-3.18.13-rt10-r7s4/drivers/md/bcache/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ 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-3.18.13-rt10-r7s4/drivers/md/dm.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/md/dm.c +++ linux-3.18.13-rt10-r7s4/drivers/md/dm.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1901 @ static void dm_request_fn(struct request if (map_request(ti, clone, md)) goto requeued; - BUG_ON(!irqs_disabled()); + BUG_ON_NONRT(!irqs_disabled()); spin_lock(q->queue_lock); } goto out; requeued: - BUG_ON(!irqs_disabled()); + BUG_ON_NONRT(!irqs_disabled()); spin_lock(q->queue_lock); delay_and_out: Index: linux-3.18.13-rt10-r7s4/drivers/md/raid5.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/md/raid5.c +++ linux-3.18.13-rt10-r7s4/drivers/md/raid5.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1652 @ 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++; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1706 @ 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 int grow_one_stripe(struct r5conf *conf, int hash) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:5713 @ static int raid5_alloc_percpu(struct r5c __func__, cpu); break; } + spin_lock_init(&per_cpu_ptr(conf->percpu, cpu)->lock); } put_online_cpus(); Index: linux-3.18.13-rt10-r7s4/drivers/md/raid5.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/md/raid5.h +++ linux-3.18.13-rt10-r7s4/drivers/md/raid5.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:460 @ 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 */ void *scribble; /* space for constructing buffer * lists and performing address Index: linux-3.18.13-rt10-r7s4/drivers/misc/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/misc/Kconfig +++ linux-3.18.13-rt10-r7s4/drivers/misc/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:57 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:73 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:87 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:125 @ config IBM_ASM for information on the specific driver level and support statement for your IBM server. +config HWLAT_DETECTOR + tristate "Testing module to detect hardware-induced latencies" + depends on DEBUG_FS + depends on RING_BUFFER + default m + ---help--- + A simple hardware latency detector. Use this module to detect + large latencies introduced by the behavior of the underlying + system firmware external to Linux. We do this using periodic + use of stop_machine to grab all available CPUs and measure + for unexplainable gaps in the CPU timestamp counter(s). By + default, the module is not enabled until the "enable" file + within the "hwlat_detector" debugfs directory is toggled. + + This module is often used to detect SMI (System Management + Interrupts) on x86 systems, though is not x86 specific. To + this end, we default to using a sample window of 1 second, + during which we will sample for 0.5 seconds. If an SMI or + similar event occurs during that time, it is recorded + into an 8K samples global ring buffer until retreived. + + WARNING: This software should never be enabled (it can be built + but should not be turned on after it is loaded) in a production + environment where high latencies are a concern since the + sampling mechanism actually introduces latencies for + regular tasks while the CPU(s) are being held. + + If unsure, say N + config PHANTOM tristate "Sensable PHANToM (PCI)" depends on PCI Index: linux-3.18.13-rt10-r7s4/drivers/misc/Makefile =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/misc/Makefile +++ linux-3.18.13-rt10-r7s4/drivers/misc/Makefile @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:41 @ obj-$(CONFIG_C2PORT) += c2port/ obj-$(CONFIG_HMC6352) += hmc6352.o obj-y += eeprom/ obj-y += cb710/ +obj-$(CONFIG_HWLAT_DETECTOR) += hwlat_detector.o obj-$(CONFIG_SPEAR13XX_PCIE_GADGET) += spear13xx_pcie_gadget.o obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o Index: linux-3.18.13-rt10-r7s4/drivers/misc/hwlat_detector.c =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/drivers/misc/hwlat_detector.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +/* + * hwlat_detector.c - A simple Hardware Latency detector. + * + * Use this module to detect large system latencies induced by the behavior of + * certain underlying system hardware or firmware, independent of Linux itself. + * The code was developed originally to detect the presence of SMIs on Intel + * and AMD systems, although there is no dependency upon x86 herein. + * + * The classical example usage of this module is in detecting the presence of + * SMIs or System Management Interrupts on Intel and AMD systems. An SMI is a + * somewhat special form of hardware interrupt spawned from earlier CPU debug + * modes in which the (BIOS/EFI/etc.) firmware arranges for the South Bridge + * LPC (or other device) to generate a special interrupt under certain + * circumstances, for example, upon expiration of a special SMI timer device, + * due to certain external thermal readings, on certain I/O address accesses, + * and other situations. An SMI hits a special CPU pin, triggers a special + * SMI mode (complete with special memory map), and the OS is unaware. + * + * Although certain hardware-inducing latencies are necessary (for example, + * a modern system often requires an SMI handler for correct thermal control + * and remote management) they can wreak havoc upon any OS-level performance + * guarantees toward low-latency, especially when the OS is not even made + * aware of the presence of these interrupts. For this reason, we need a + * somewhat brute force mechanism to detect these interrupts. In this case, + * we do it by hogging all of the CPU(s) for configurable timer intervals, + * sampling the built-in CPU timer, looking for discontiguous readings. + * + * WARNING: This implementation necessarily introduces latencies. Therefore, + * you should NEVER use this module in a production environment + * requiring any kind of low-latency performance guarantee(s). + * + * Copyright (C) 2008-2009 Jon Masters, Red Hat, Inc. <jcm@redhat.com> + * + * Includes useful feedback from Clark Williams <clark@redhat.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/ring_buffer.h> +#include <linux/time.h> +#include <linux/hrtimer.h> +#include <linux/kthread.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> +#include <linux/version.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/trace_clock.h> + +#define BUF_SIZE_DEFAULT 262144UL /* 8K*(sizeof(entry)) */ +#define BUF_FLAGS (RB_FL_OVERWRITE) /* no block on full */ +#define U64STR_SIZE 22 /* 20 digits max */ + +#define VERSION "1.0.0" +#define BANNER "hwlat_detector: " +#define DRVNAME "hwlat_detector" +#define DEFAULT_SAMPLE_WINDOW 1000000 /* 1s */ +#define DEFAULT_SAMPLE_WIDTH 500000 /* 0.5s */ +#define DEFAULT_LAT_THRESHOLD 10 /* 10us */ + +/* Module metadata */ + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Jon Masters <jcm@redhat.com>"); +MODULE_DESCRIPTION("A simple hardware latency detector"); +MODULE_VERSION(VERSION); + +/* Module parameters */ + +static int debug; +static int enabled; +static int threshold; + +module_param(debug, int, 0); /* enable debug */ +module_param(enabled, int, 0); /* enable detector */ +module_param(threshold, int, 0); /* latency threshold */ + +/* Buffering and sampling */ + +static struct ring_buffer *ring_buffer; /* sample buffer */ +static DEFINE_MUTEX(ring_buffer_mutex); /* lock changes */ +static unsigned long buf_size = BUF_SIZE_DEFAULT; +static struct task_struct *kthread; /* sampling thread */ + +/* DebugFS filesystem entries */ + +static struct dentry *debug_dir; /* debugfs directory */ +static struct dentry *debug_max; /* maximum TSC delta */ +static struct dentry *debug_count; /* total detect count */ +static struct dentry *debug_sample_width; /* sample width us */ +static struct dentry *debug_sample_window; /* sample window us */ +static struct dentry *debug_sample; /* raw samples us */ +static struct dentry *debug_threshold; /* threshold us */ +static struct dentry *debug_enable; /* enable/disable */ + +/* Individual samples and global state */ + +struct sample; /* latency sample */ +struct data; /* Global state */ + +/* Sampling functions */ +static int __buffer_add_sample(struct sample *sample); +static struct sample *buffer_get_sample(struct sample *sample); + +/* Threading and state */ +static int kthread_fn(void *unused); +static int start_kthread(void); +static int stop_kthread(void); +static void __reset_stats(void); +static int init_stats(void); + +/* Debugfs interface */ +static ssize_t simple_data_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos, const u64 *entry); +static ssize_t simple_data_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos, u64 *entry); +static int debug_sample_fopen(struct inode *inode, struct file *filp); +static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos); +static int debug_sample_release(struct inode *inode, struct file *filp); +static int debug_enable_fopen(struct inode *inode, struct file *filp); +static ssize_t debug_enable_fread(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos); +static ssize_t debug_enable_fwrite(struct file *file, + const char __user *user_buffer, + size_t user_size, loff_t *offset); + +/* Initialization functions */ +static int init_debugfs(void); +static void free_debugfs(void); +static int detector_init(void); +static void detector_exit(void); + +/* Individual latency samples are stored here when detected and packed into + * the ring_buffer circular buffer, where they are overwritten when + * more than buf_size/sizeof(sample) samples are received. */ +struct sample { + u64 seqnum; /* unique sequence */ + u64 duration; /* ktime delta */ + u64 outer_duration; /* ktime delta (outer loop) */ + struct timespec timestamp; /* wall time */ + unsigned long lost; +}; + +/* keep the global state somewhere. */ +static struct data { + + struct mutex lock; /* protect changes */ + + u64 count; /* total since reset */ + u64 max_sample; /* max hardware latency */ + u64 threshold; /* sample threshold level */ + + u64 sample_window; /* total sampling window (on+off) */ + u64 sample_width; /* active sampling portion of window */ + + atomic_t sample_open; /* whether the sample file is open */ + + wait_queue_head_t wq; /* waitqeue for new sample values */ + +} data; + +/** + * __buffer_add_sample - add a new latency sample recording to the ring buffer + * @sample: The new latency sample value + * + * This receives a new latency sample and records it in a global ring buffer. + * No additional locking is used in this case. + */ +static int __buffer_add_sample(struct sample *sample) +{ + return ring_buffer_write(ring_buffer, + sizeof(struct sample), sample); +} + +/** + * buffer_get_sample - remove a hardware latency sample from the ring buffer + * @sample: Pre-allocated storage for the sample + * + * This retrieves a hardware latency sample from the global circular buffer + */ +static struct sample *buffer_get_sample(struct sample *sample) +{ + struct ring_buffer_event *e = NULL; + struct sample *s = NULL; + unsigned int cpu = 0; + + if (!sample) + return NULL; + + mutex_lock(&ring_buffer_mutex); + for_each_online_cpu(cpu) { + e = ring_buffer_consume(ring_buffer, cpu, NULL, &sample->lost); + if (e) + break; + } + + if (e) { + s = ring_buffer_event_data(e); + memcpy(sample, s, sizeof(struct sample)); + } else + sample = NULL; + mutex_unlock(&ring_buffer_mutex); + + return sample; +} + +#ifndef CONFIG_TRACING +#define time_type ktime_t +#define time_get() ktime_get() +#define time_to_us(x) ktime_to_us(x) +#define time_sub(a, b) ktime_sub(a, b) +#define init_time(a, b) (a).tv64 = b +#define time_u64(a) ((a).tv64) +#else +#define time_type u64 +#define time_get() trace_clock_local() +#define time_to_us(x) div_u64(x, 1000) +#define time_sub(a, b) ((a) - (b)) +#define init_time(a, b) (a = b) +#define time_u64(a) a +#endif +/** + * get_sample - sample the CPU TSC and look for likely hardware latencies + * + * Used to repeatedly capture the CPU TSC (or similar), looking for potential + * hardware-induced latency. Called with interrupts disabled and with + * data.lock held. + */ +static int get_sample(void) +{ + time_type start, t1, t2, last_t2; + s64 diff, total = 0; + u64 sample = 0; + u64 outer_sample = 0; + int ret = -1; + + init_time(last_t2, 0); + start = time_get(); /* start timestamp */ + + do { + + t1 = time_get(); /* we'll look for a discontinuity */ + t2 = time_get(); + + if (time_u64(last_t2)) { + /* Check the delta from outer loop (t2 to next t1) */ + diff = time_to_us(time_sub(t1, last_t2)); + /* This shouldn't happen */ + if (diff < 0) { + pr_err(BANNER "time running backwards\n"); + goto out; + } + if (diff > outer_sample) + outer_sample = diff; + } + last_t2 = t2; + + total = time_to_us(time_sub(t2, start)); /* sample width */ + + /* This checks the inner loop (t1 to t2) */ + diff = time_to_us(time_sub(t2, t1)); /* current diff */ + + /* This shouldn't happen */ + if (diff < 0) { + pr_err(BANNER "time running backwards\n"); + goto out; + } + + if (diff > sample) + sample = diff; /* only want highest value */ + + } while (total <= data.sample_width); + + ret = 0; + + /* If we exceed the threshold value, we have found a hardware latency */ + if (sample > data.threshold || outer_sample > data.threshold) { + struct sample s; + + ret = 1; + + data.count++; + s.seqnum = data.count; + s.duration = sample; + s.outer_duration = outer_sample; + s.timestamp = CURRENT_TIME; + __buffer_add_sample(&s); + + /* Keep a running maximum ever recorded hardware latency */ + if (sample > data.max_sample) + data.max_sample = sample; + } + +out: + return ret; +} + +/* + * kthread_fn - The CPU time sampling/hardware latency detection kernel thread + * @unused: A required part of the kthread API. + * + * Used to periodically sample the CPU TSC via a call to get_sample. We + * disable interrupts, which does (intentionally) introduce latency since we + * need to ensure nothing else might be running (and thus pre-empting). + * Obviously this should never be used in production environments. + * + * Currently this runs on which ever CPU it was scheduled on, but most + * real-worald hardware latency situations occur across several CPUs, + * but we might later generalize this if we find there are any actualy + * systems with alternate SMI delivery or other hardware latencies. + */ +static int kthread_fn(void *unused) +{ + int ret; + u64 interval; + + while (!kthread_should_stop()) { + + mutex_lock(&data.lock); + + local_irq_disable(); + ret = get_sample(); + local_irq_enable(); + + if (ret > 0) + wake_up(&data.wq); /* wake up reader(s) */ + + interval = data.sample_window - data.sample_width; + do_div(interval, USEC_PER_MSEC); /* modifies interval value */ + + mutex_unlock(&data.lock); + + if (msleep_interruptible(interval)) + break; + } + + return 0; +} + +/** + * start_kthread - Kick off the hardware latency sampling/detector kthread + * + * This starts a kernel thread that will sit and sample the CPU timestamp + * counter (TSC or similar) and look for potential hardware latencies. + */ +static int start_kthread(void) +{ + kthread = kthread_run(kthread_fn, NULL, + DRVNAME); + if (IS_ERR(kthread)) { + pr_err(BANNER "could not start sampling thread\n"); + enabled = 0; + return -ENOMEM; + } + + return 0; +} + +/** + * stop_kthread - Inform the hardware latency samping/detector kthread to stop + * + * This kicks the running hardware latency sampling/detector kernel thread and + * tells it to stop sampling now. Use this on unload and at system shutdown. + */ +static int stop_kthread(void) +{ + int ret; + + ret = kthread_stop(kthread); + + return ret; +} + +/** + * __reset_stats - Reset statistics for the hardware latency detector + * + * We use data to store various statistics and global state. We call this + * function in order to reset those when "enable" is toggled on or off, and + * also at initialization. Should be called with data.lock held. + */ +static void __reset_stats(void) +{ + data.count = 0; + data.max_sample = 0; + ring_buffer_reset(ring_buffer); /* flush out old sample entries */ +} + +/** + * init_stats - Setup global state statistics for the hardware latency detector + * + * We use data to store various statistics and global state. We also use + * a global ring buffer (ring_buffer) to keep raw samples of detected hardware + * induced system latencies. This function initializes these structures and + * allocates the global ring buffer also. + */ +static int init_stats(void) +{ + int ret = -ENOMEM; + + mutex_init(&data.lock); + init_waitqueue_head(&data.wq); + atomic_set(&data.sample_open, 0); + + ring_buffer = ring_buffer_alloc(buf_size, BUF_FLAGS); + + if (WARN(!ring_buffer, KERN_ERR BANNER + "failed to allocate ring buffer!\n")) + goto out; + + __reset_stats(); + data.threshold = threshold ?: DEFAULT_LAT_THRESHOLD; /* threshold us */ + data.sample_window = DEFAULT_SAMPLE_WINDOW; /* window us */ + data.sample_width = DEFAULT_SAMPLE_WIDTH; /* width us */ + + ret = 0; + +out: + return ret; + +} + +/* + * simple_data_read - Wrapper read function for global state debugfs entries + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The userspace provided buffer to read value into + * @cnt: The maximum number of bytes to read + * @ppos: The current "file" position + * @entry: The entry to read from + * + * This function provides a generic read implementation for the global state + * "data" structure debugfs filesystem entries. It would be nice to use + * simple_attr_read directly, but we need to make sure that the data.lock + * is held during the actual read. + */ +static ssize_t simple_data_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos, const u64 *entry) +{ + char buf[U64STR_SIZE]; + u64 val = 0; + int len = 0; + + memset(buf, 0, sizeof(buf)); + + if (!entry) + return -EFAULT; + + mutex_lock(&data.lock); + val = *entry; + mutex_unlock(&data.lock); + + len = snprintf(buf, sizeof(buf), "%llu\n", (unsigned long long)val); + + return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); + +} + +/* + * simple_data_write - Wrapper write function for global state debugfs entries + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The userspace provided buffer to write value from + * @cnt: The maximum number of bytes to write + * @ppos: The current "file" position + * @entry: The entry to write to + * + * This function provides a generic write implementation for the global state + * "data" structure debugfs filesystem entries. It would be nice to use + * simple_attr_write directly, but we need to make sure that the data.lock + * is held during the actual write. + */ +static ssize_t simple_data_write(struct file *filp, const char __user *ubuf, + size_t cnt, loff_t *ppos, u64 *entry) +{ + char buf[U64STR_SIZE]; + int csize = min(cnt, sizeof(buf)); + u64 val = 0; + int err = 0; + + memset(buf, '\0', sizeof(buf)); + if (copy_from_user(buf, ubuf, csize)) + return -EFAULT; + + buf[U64STR_SIZE-1] = '\0'; /* just in case */ + err = kstrtoull(buf, 10, &val); + if (err) + return -EINVAL; + + mutex_lock(&data.lock); + *entry = val; + mutex_unlock(&data.lock); + + return csize; +} + +/** + * debug_count_fopen - Open function for "count" debugfs entry + * @inode: The in-kernel inode representation of the debugfs "file" + * @filp: The active open file structure for the debugfs "file" + * + * This function provides an open implementation for the "count" debugfs + * interface to the hardware latency detector. + */ +static int debug_count_fopen(struct inode *inode, struct file *filp) +{ + return 0; +} + +/** + * debug_count_fread - Read function for "count" debugfs entry + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The userspace provided buffer to read value into + * @cnt: The maximum number of bytes to read + * @ppos: The current "file" position + * + * This function provides a read implementation for the "count" debugfs + * interface to the hardware latency detector. Can be used to read the + * number of latency readings exceeding the configured threshold since + * the detector was last reset (e.g. by writing a zero into "count"). + */ +static ssize_t debug_count_fread(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + return simple_data_read(filp, ubuf, cnt, ppos, &data.count); +} + +/** + * debug_count_fwrite - Write function for "count" debugfs entry + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The user buffer that contains the value to write + * @cnt: The maximum number of bytes to write to "file" + * @ppos: The current position in the debugfs "file" + * + * This function provides a write implementation for the "count" debugfs + * interface to the hardware latency detector. Can be used to write a + * desired value, especially to zero the total count. + */ +static ssize_t debug_count_fwrite(struct file *filp, + const char __user *ubuf, + size_t cnt, + loff_t *ppos) +{ + return simple_data_write(filp, ubuf, cnt, ppos, &data.count); +} + +/** + * debug_enable_fopen - Dummy open function for "enable" debugfs interface + * @inode: The in-kernel inode representation of the debugfs "file" + * @filp: The active open file structure for the debugfs "file" + * + * This function provides an open implementation for the "enable" debugfs + * interface to the hardware latency detector. + */ +static int debug_enable_fopen(struct inode *inode, struct file *filp) +{ + return 0; +} + +/** + * debug_enable_fread - Read function for "enable" debugfs interface + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The userspace provided buffer to read value into + * @cnt: The maximum number of bytes to read + * @ppos: The current "file" position + * + * This function provides a read implementation for the "enable" debugfs + * interface to the hardware latency detector. Can be used to determine + * whether the detector is currently enabled ("0\n" or "1\n" returned). + */ +static ssize_t debug_enable_fread(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + char buf[4]; + + if ((cnt < sizeof(buf)) || (*ppos)) + return 0; + + buf[0] = enabled ? '1' : '0'; + buf[1] = '\n'; + buf[2] = '\0'; + if (copy_to_user(ubuf, buf, strlen(buf))) + return -EFAULT; + return *ppos = strlen(buf); +} + +/** + * debug_enable_fwrite - Write function for "enable" debugfs interface + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The user buffer that contains the value to write + * @cnt: The maximum number of bytes to write to "file" + * @ppos: The current position in the debugfs "file" + * + * This function provides a write implementation for the "enable" debugfs + * interface to the hardware latency detector. Can be used to enable or + * disable the detector, which will have the side-effect of possibly + * also resetting the global stats and kicking off the measuring + * kthread (on an enable) or the converse (upon a disable). + */ +static ssize_t debug_enable_fwrite(struct file *filp, + const char __user *ubuf, + size_t cnt, + loff_t *ppos) +{ + char buf[4]; + int csize = min(cnt, sizeof(buf)); + long val = 0; + int err = 0; + + memset(buf, '\0', sizeof(buf)); + if (copy_from_user(buf, ubuf, csize)) + return -EFAULT; + + buf[sizeof(buf)-1] = '\0'; /* just in case */ + err = kstrtoul(buf, 10, &val); + if (0 != err) + return -EINVAL; + + if (val) { + if (enabled) + goto unlock; + enabled = 1; + __reset_stats(); + if (start_kthread()) + return -EFAULT; + } else { + if (!enabled) + goto unlock; + enabled = 0; + err = stop_kthread(); + if (err) { + pr_err(BANNER "cannot stop kthread\n"); + return -EFAULT; + } + wake_up(&data.wq); /* reader(s) should return */ + } +unlock: + return csize; +} + +/** + * debug_max_fopen - Open function for "max" debugfs entry + * @inode: The in-kernel inode representation of the debugfs "file" + * @filp: The active open file structure for the debugfs "file" + * + * This function provides an open implementation for the "max" debugfs + * interface to the hardware latency detector. + */ +static int debug_max_fopen(struct inode *inode, struct file *filp) +{ + return 0; +} + +/** + * debug_max_fread - Read function for "max" debugfs entry + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The userspace provided buffer to read value into + * @cnt: The maximum number of bytes to read + * @ppos: The current "file" position + * + * This function provides a read implementation for the "max" debugfs + * interface to the hardware latency detector. Can be used to determine + * the maximum latency value observed since it was last reset. + */ +static ssize_t debug_max_fread(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + return simple_data_read(filp, ubuf, cnt, ppos, &data.max_sample); +} + +/** + * debug_max_fwrite - Write function for "max" debugfs entry + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The user buffer that contains the value to write + * @cnt: The maximum number of bytes to write to "file" + * @ppos: The current position in the debugfs "file" + * + * This function provides a write implementation for the "max" debugfs + * interface to the hardware latency detector. Can be used to reset the + * maximum or set it to some other desired value - if, then, subsequent + * measurements exceed this value, the maximum will be updated. + */ +static ssize_t debug_max_fwrite(struct file *filp, + const char __user *ubuf, + size_t cnt, + loff_t *ppos) +{ + return simple_data_write(filp, ubuf, cnt, ppos, &data.max_sample); +} + + +/** + * debug_sample_fopen - An open function for "sample" debugfs interface + * @inode: The in-kernel inode representation of this debugfs "file" + * @filp: The active open file structure for the debugfs "file" + * + * This function handles opening the "sample" file within the hardware + * latency detector debugfs directory interface. This file is used to read + * raw samples from the global ring_buffer and allows the user to see a + * running latency history. Can be opened blocking or non-blocking, + * affecting whether it behaves as a buffer read pipe, or does not. + * Implements simple locking to prevent multiple simultaneous use. + */ +static int debug_sample_fopen(struct inode *inode, struct file *filp) +{ + if (!atomic_add_unless(&data.sample_open, 1, 1)) + return -EBUSY; + else + return 0; +} + +/** + * debug_sample_fread - A read function for "sample" debugfs interface + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The user buffer that will contain the samples read + * @cnt: The maximum bytes to read from the debugfs "file" + * @ppos: The current position in the debugfs "file" + * + * This function handles reading from the "sample" file within the hardware + * latency detector debugfs directory interface. This file is used to read + * raw samples from the global ring_buffer and allows the user to see a + * running latency history. By default this will block pending a new + * value written into the sample buffer, unless there are already a + * number of value(s) waiting in the buffer, or the sample file was + * previously opened in a non-blocking mode of operation. + */ +static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + int len = 0; + char buf[64]; + struct sample *sample = NULL; + + if (!enabled) + return 0; + + sample = kzalloc(sizeof(struct sample), GFP_KERNEL); + if (!sample) + return -ENOMEM; + + while (!buffer_get_sample(sample)) { + + DEFINE_WAIT(wait); + + if (filp->f_flags & O_NONBLOCK) { + len = -EAGAIN; + goto out; + } + + prepare_to_wait(&data.wq, &wait, TASK_INTERRUPTIBLE); + schedule(); + finish_wait(&data.wq, &wait); + + if (signal_pending(current)) { + len = -EINTR; + goto out; + } + + if (!enabled) { /* enable was toggled */ + len = 0; + goto out; + } + } + + len = snprintf(buf, sizeof(buf), "%010lu.%010lu\t%llu\t%llu\n", + sample->timestamp.tv_sec, + sample->timestamp.tv_nsec, + sample->duration, + sample->outer_duration); + + + /* handling partial reads is more trouble than it's worth */ + if (len > cnt) + goto out; + + if (copy_to_user(ubuf, buf, len)) + len = -EFAULT; + +out: + kfree(sample); + return len; +} + +/** + * debug_sample_release - Release function for "sample" debugfs interface + * @inode: The in-kernel inode represenation of the debugfs "file" + * @filp: The active open file structure for the debugfs "file" + * + * This function completes the close of the debugfs interface "sample" file. + * Frees the sample_open "lock" so that other users may open the interface. + */ +static int debug_sample_release(struct inode *inode, struct file *filp) +{ + atomic_dec(&data.sample_open); + + return 0; +} + +/** + * debug_threshold_fopen - Open function for "threshold" debugfs entry + * @inode: The in-kernel inode representation of the debugfs "file" + * @filp: The active open file structure for the debugfs "file" + * + * This function provides an open implementation for the "threshold" debugfs + * interface to the hardware latency detector. + */ +static int debug_threshold_fopen(struct inode *inode, struct file *filp) +{ + return 0; +} + +/** + * debug_threshold_fread - Read function for "threshold" debugfs entry + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The userspace provided buffer to read value into + * @cnt: The maximum number of bytes to read + * @ppos: The current "file" position + * + * This function provides a read implementation for the "threshold" debugfs + * interface to the hardware latency detector. It can be used to determine + * the current threshold level at which a latency will be recorded in the + * global ring buffer, typically on the order of 10us. + */ +static ssize_t debug_threshold_fread(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + return simple_data_read(filp, ubuf, cnt, ppos, &data.threshold); +} + +/** + * debug_threshold_fwrite - Write function for "threshold" debugfs entry + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The user buffer that contains the value to write + * @cnt: The maximum number of bytes to write to "file" + * @ppos: The current position in the debugfs "file" + * + * This function provides a write implementation for the "threshold" debugfs + * interface to the hardware latency detector. It can be used to configure + * the threshold level at which any subsequently detected latencies will + * be recorded into the global ring buffer. + */ +static ssize_t debug_threshold_fwrite(struct file *filp, + const char __user *ubuf, + size_t cnt, + loff_t *ppos) +{ + int ret; + + ret = simple_data_write(filp, ubuf, cnt, ppos, &data.threshold); + + if (enabled) + wake_up_process(kthread); + + return ret; +} + +/** + * debug_width_fopen - Open function for "width" debugfs entry + * @inode: The in-kernel inode representation of the debugfs "file" + * @filp: The active open file structure for the debugfs "file" + * + * This function provides an open implementation for the "width" debugfs + * interface to the hardware latency detector. + */ +static int debug_width_fopen(struct inode *inode, struct file *filp) +{ + return 0; +} + +/** + * debug_width_fread - Read function for "width" debugfs entry + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The userspace provided buffer to read value into + * @cnt: The maximum number of bytes to read + * @ppos: The current "file" position + * + * This function provides a read implementation for the "width" debugfs + * interface to the hardware latency detector. It can be used to determine + * for how many us of the total window us we will actively sample for any + * hardware-induced latecy periods. Obviously, it is not possible to + * sample constantly and have the system respond to a sample reader, or, + * worse, without having the system appear to have gone out to lunch. + */ +static ssize_t debug_width_fread(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + return simple_data_read(filp, ubuf, cnt, ppos, &data.sample_width); +} + +/** + * debug_width_fwrite - Write function for "width" debugfs entry + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The user buffer that contains the value to write + * @cnt: The maximum number of bytes to write to "file" + * @ppos: The current position in the debugfs "file" + * + * This function provides a write implementation for the "width" debugfs + * interface to the hardware latency detector. It can be used to configure + * for how many us of the total window us we will actively sample for any + * hardware-induced latency periods. Obviously, it is not possible to + * sample constantly and have the system respond to a sample reader, or, + * worse, without having the system appear to have gone out to lunch. It + * is enforced that width is less that the total window size. + */ +static ssize_t debug_width_fwrite(struct file *filp, + const char __user *ubuf, + size_t cnt, + loff_t *ppos) +{ + char buf[U64STR_SIZE]; + int csize = min(cnt, sizeof(buf)); + u64 val = 0; + int err = 0; + + memset(buf, '\0', sizeof(buf)); + if (copy_from_user(buf, ubuf, csize)) + return -EFAULT; + + buf[U64STR_SIZE-1] = '\0'; /* just in case */ + err = kstrtoull(buf, 10, &val); + if (0 != err) + return -EINVAL; + + mutex_lock(&data.lock); + if (val < data.sample_window) + data.sample_width = val; + else { + mutex_unlock(&data.lock); + return -EINVAL; + } + mutex_unlock(&data.lock); + + if (enabled) + wake_up_process(kthread); + + return csize; +} + +/** + * debug_window_fopen - Open function for "window" debugfs entry + * @inode: The in-kernel inode representation of the debugfs "file" + * @filp: The active open file structure for the debugfs "file" + * + * This function provides an open implementation for the "window" debugfs + * interface to the hardware latency detector. The window is the total time + * in us that will be considered one sample period. Conceptually, windows + * occur back-to-back and contain a sample width period during which + * actual sampling occurs. + */ +static int debug_window_fopen(struct inode *inode, struct file *filp) +{ + return 0; +} + +/** + * debug_window_fread - Read function for "window" debugfs entry + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The userspace provided buffer to read value into + * @cnt: The maximum number of bytes to read + * @ppos: The current "file" position + * + * This function provides a read implementation for the "window" debugfs + * interface to the hardware latency detector. The window is the total time + * in us that will be considered one sample period. Conceptually, windows + * occur back-to-back and contain a sample width period during which + * actual sampling occurs. Can be used to read the total window size. + */ +static ssize_t debug_window_fread(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + return simple_data_read(filp, ubuf, cnt, ppos, &data.sample_window); +} + +/** + * debug_window_fwrite - Write function for "window" debugfs entry + * @filp: The active open file structure for the debugfs "file" + * @ubuf: The user buffer that contains the value to write + * @cnt: The maximum number of bytes to write to "file" + * @ppos: The current position in the debugfs "file" + * + * This function provides a write implementation for the "window" debufds + * interface to the hardware latency detetector. The window is the total time + * in us that will be considered one sample period. Conceptually, windows + * occur back-to-back and contain a sample width period during which + * actual sampling occurs. Can be used to write a new total window size. It + * is enfoced that any value written must be greater than the sample width + * size, or an error results. + */ +static ssize_t debug_window_fwrite(struct file *filp, + const char __user *ubuf, + size_t cnt, + loff_t *ppos) +{ + char buf[U64STR_SIZE]; + int csize = min(cnt, sizeof(buf)); + u64 val = 0; + int err = 0; + + memset(buf, '\0', sizeof(buf)); + if (copy_from_user(buf, ubuf, csize)) + return -EFAULT; + + buf[U64STR_SIZE-1] = '\0'; /* just in case */ + err = kstrtoull(buf, 10, &val); + if (0 != err) + return -EINVAL; + + mutex_lock(&data.lock); + if (data.sample_width < val) + data.sample_window = val; + else { + mutex_unlock(&data.lock); + return -EINVAL; + } + mutex_unlock(&data.lock); + + return csize; +} + +/* + * Function pointers for the "count" debugfs file operations + */ +static const struct file_operations count_fops = { + .open = debug_count_fopen, + .read = debug_count_fread, + .write = debug_count_fwrite, + .owner = THIS_MODULE, +}; + +/* + * Function pointers for the "enable" debugfs file operations + */ +static const struct file_operations enable_fops = { + .open = debug_enable_fopen, + .read = debug_enable_fread, + .write = debug_enable_fwrite, + .owner = THIS_MODULE, +}; + +/* + * Function pointers for the "max" debugfs file operations + */ +static const struct file_operations max_fops = { + .open = debug_max_fopen, + .read = debug_max_fread, + .write = debug_max_fwrite, + .owner = THIS_MODULE, +}; + +/* + * Function pointers for the "sample" debugfs file operations + */ +static const struct file_operations sample_fops = { + .open = debug_sample_fopen, + .read = debug_sample_fread, + .release = debug_sample_release, + .owner = THIS_MODULE, +}; + +/* + * Function pointers for the "threshold" debugfs file operations + */ +static const struct file_operations threshold_fops = { + .open = debug_threshold_fopen, + .read = debug_threshold_fread, + .write = debug_threshold_fwrite, + .owner = THIS_MODULE, +}; + +/* + * Function pointers for the "width" debugfs file operations + */ +static const struct file_operations width_fops = { + .open = debug_width_fopen, + .read = debug_width_fread, + .write = debug_width_fwrite, + .owner = THIS_MODULE, +}; + +/* + * Function pointers for the "window" debugfs file operations + */ +static const struct file_operations window_fops = { + .open = debug_window_fopen, + .read = debug_window_fread, + .write = debug_window_fwrite, + .owner = THIS_MODULE, +}; + +/** + * init_debugfs - A function to initialize the debugfs interface files + * + * This function creates entries in debugfs for "hwlat_detector", including + * files to read values from the detector, current samples, and the + * maximum sample that has been captured since the hardware latency + * dectector was started. + */ +static int init_debugfs(void) +{ + int ret = -ENOMEM; + + debug_dir = debugfs_create_dir(DRVNAME, NULL); + if (!debug_dir) + goto err_debug_dir; + + debug_sample = debugfs_create_file("sample", 0444, + debug_dir, NULL, + &sample_fops); + if (!debug_sample) + goto err_sample; + + debug_count = debugfs_create_file("count", 0444, + debug_dir, NULL, + &count_fops); + if (!debug_count) + goto err_count; + + debug_max = debugfs_create_file("max", 0444, + debug_dir, NULL, + &max_fops); + if (!debug_max) + goto err_max; + + debug_sample_window = debugfs_create_file("window", 0644, + debug_dir, NULL, + &window_fops); + if (!debug_sample_window) + goto err_window; + + debug_sample_width = debugfs_create_file("width", 0644, + debug_dir, NULL, + &width_fops); + if (!debug_sample_width) + goto err_width; + + debug_threshold = debugfs_create_file("threshold", 0644, + debug_dir, NULL, + &threshold_fops); + if (!debug_threshold) + goto err_threshold; + + debug_enable = debugfs_create_file("enable", 0644, + debug_dir, &enabled, + &enable_fops); + if (!debug_enable) + goto err_enable; + + else { + ret = 0; + goto out; + } + +err_enable: + debugfs_remove(debug_threshold); +err_threshold: + debugfs_remove(debug_sample_width); +err_width: + debugfs_remove(debug_sample_window); +err_window: + debugfs_remove(debug_max); +err_max: + debugfs_remove(debug_count); +err_count: + debugfs_remove(debug_sample); +err_sample: + debugfs_remove(debug_dir); +err_debug_dir: +out: + return ret; +} + +/** + * free_debugfs - A function to cleanup the debugfs file interface + */ +static void free_debugfs(void) +{ + /* could also use a debugfs_remove_recursive */ + debugfs_remove(debug_enable); + debugfs_remove(debug_threshold); + debugfs_remove(debug_sample_width); + debugfs_remove(debug_sample_window); + debugfs_remove(debug_max); + debugfs_remove(debug_count); + debugfs_remove(debug_sample); + debugfs_remove(debug_dir); +} + +/** + * detector_init - Standard module initialization code + */ +static int detector_init(void) +{ + int ret = -ENOMEM; + + pr_info(BANNER "version %s\n", VERSION); + + ret = init_stats(); + if (0 != ret) + goto out; + + ret = init_debugfs(); + if (0 != ret) + goto err_stats; + + if (enabled) + ret = start_kthread(); + + goto out; + +err_stats: + ring_buffer_free(ring_buffer); +out: + return ret; + +} + +/** + * detector_exit - Standard module cleanup code + */ +static void detector_exit(void) +{ + int err; + + if (enabled) { + enabled = 0; + err = stop_kthread(); + if (err) + pr_err(BANNER "cannot stop kthread\n"); + } + + free_debugfs(); + ring_buffer_free(ring_buffer); /* free up the ring buffer */ + +} + +module_init(detector_init); +module_exit(detector_exit); Index: linux-3.18.13-rt10-r7s4/drivers/mmc/host/mmci.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/mmc/host/mmci.c +++ linux-3.18.13-rt10-r7s4/drivers/mmc/host/mmci.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1156 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1201 @ 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-3.18.13-rt10-r7s4/drivers/mmc/host/sdhci.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/mmc/host/sdhci.c +++ linux-3.18.13-rt10-r7s4/drivers/mmc/host/sdhci.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2568 @ static irqreturn_t sdhci_thread_irq(int return isr ? IRQ_HANDLED : IRQ_NONE; } +#ifdef CONFIG_PREEMPT_RT_BASE +static irqreturn_t sdhci_rt_irq(int irq, void *dev_id) +{ + irqreturn_t ret; + + local_bh_disable(); + ret = sdhci_irq(irq, dev_id); + local_bh_enable(); + if (ret == IRQ_WAKE_THREAD) + ret = sdhci_thread_irq(irq, dev_id); + return ret; +} +#endif + +static int sdhci_req_irq(struct sdhci_host *host) +{ +#ifdef CONFIG_PREEMPT_RT_BASE + return request_threaded_irq(host->irq, NULL, sdhci_rt_irq, + IRQF_SHARED, mmc_hostname(host->mmc), host); +#else + return request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq, + IRQF_SHARED, mmc_hostname(host->mmc), host); +#endif +} + /*****************************************************************************\ * * * Suspend/resume * @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2660 @ int sdhci_resume_host(struct sdhci_host } if (!device_may_wakeup(mmc_dev(host->mmc))) { - ret = request_threaded_irq(host->irq, sdhci_irq, - sdhci_thread_irq, IRQF_SHARED, - mmc_hostname(host->mmc), host); + ret = sdhci_req_irq(host); if (ret) return ret; } else { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3279 @ int sdhci_add_host(struct sdhci_host *ho sdhci_init(host, 0); - ret = request_threaded_irq(host->irq, sdhci_irq, sdhci_thread_irq, - IRQF_SHARED, mmc_hostname(mmc), host); + ret = sdhci_req_irq(host); if (ret) { pr_err("%s: Failed to request IRQ %d: %d\n", mmc_hostname(mmc), host->irq, ret); Index: linux-3.18.13-rt10-r7s4/drivers/net/ethernet/3com/3c59x.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/ethernet/3com/3c59x.c +++ linux-3.18.13-rt10-r7s4/drivers/net/ethernet/3com/3c59x.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:845 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1919 @ 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-3.18.13-rt10-r7s4/drivers/net/ethernet/atheros/atl1c/atl1c_main.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/ethernet/atheros/atl1c/atl1c_main.c +++ linux-3.18.13-rt10-r7s4/drivers/net/ethernet/atheros/atl1c/atl1c_main.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2216 @ static netdev_tx_t atl1c_xmit_frame(stru } tpd_req = atl1c_cal_tpd_req(skb); - if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) { - if (netif_msg_pktdata(adapter)) - dev_info(&adapter->pdev->dev, "tx locked\n"); - return NETDEV_TX_LOCKED; - } + spin_lock_irqsave(&adapter->tx_lock, flags); if (atl1c_tpd_avail(adapter, type) < tpd_req) { /* no enough descriptor, just stop queue */ Index: linux-3.18.13-rt10-r7s4/drivers/net/ethernet/atheros/atl1e/atl1e_main.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/ethernet/atheros/atl1e/atl1e_main.c +++ linux-3.18.13-rt10-r7s4/drivers/net/ethernet/atheros/atl1e/atl1e_main.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1883 @ static netdev_tx_t atl1e_xmit_frame(stru return NETDEV_TX_OK; } tpd_req = atl1e_cal_tdp_req(skb); - if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) - return NETDEV_TX_LOCKED; + spin_lock_irqsave(&adapter->tx_lock, flags); if (atl1e_tpd_avail(adapter) < tpd_req) { /* no enough descriptor, just stop queue */ Index: linux-3.18.13-rt10-r7s4/drivers/net/ethernet/chelsio/cxgb/sge.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/ethernet/chelsio/cxgb/sge.c +++ linux-3.18.13-rt10-r7s4/drivers/net/ethernet/chelsio/cxgb/sge.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1666 @ static int t1_sge_tx(struct sk_buff *skb struct cmdQ *q = &sge->cmdQ[qid]; unsigned int credits, pidx, genbit, count, use_sched_skb = 0; - if (!spin_trylock(&q->lock)) - return NETDEV_TX_LOCKED; + spin_lock(&q->lock); reclaim_completed_tx(sge, q); Index: linux-3.18.13-rt10-r7s4/drivers/net/ethernet/freescale/gianfar.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/ethernet/freescale/gianfar.c +++ linux-3.18.13-rt10-r7s4/drivers/net/ethernet/freescale/gianfar.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1486 @ static int gfar_suspend(struct device *d if (netif_running(ndev)) { - local_irq_save(flags); + local_irq_save_nort(flags); lock_tx_qs(priv); gfar_halt_nodisable(priv); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1502 @ static int gfar_suspend(struct device *d gfar_write(®s->maccfg1, tempval); unlock_tx_qs(priv); - local_irq_restore(flags); + local_irq_restore_nort(flags); disable_napi(priv); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1544 @ static int gfar_resume(struct device *de /* Disable Magic Packet mode, in case something * else woke us up. */ - local_irq_save(flags); + local_irq_save_nort(flags); lock_tx_qs(priv); tempval = gfar_read(®s->maccfg2); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1554 @ static int gfar_resume(struct device *de gfar_start(priv); unlock_tx_qs(priv); - local_irq_restore(flags); + local_irq_restore_nort(flags); netif_device_attach(ndev); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3310 @ static irqreturn_t gfar_error(int irq, v dev->stats.tx_dropped++; atomic64_inc(&priv->extra_stats.tx_underrun); - local_irq_save(flags); + local_irq_save_nort(flags); lock_tx_qs(priv); /* Reactivate the Tx Queues */ gfar_write(®s->tstat, gfargrp->tstat); unlock_tx_qs(priv); - local_irq_restore(flags); + local_irq_restore_nort(flags); } netif_dbg(priv, tx_err, dev, "Transmit Error\n"); } Index: linux-3.18.13-rt10-r7s4/drivers/net/ethernet/neterion/s2io.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/ethernet/neterion/s2io.c +++ linux-3.18.13-rt10-r7s4/drivers/net/ethernet/neterion/s2io.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4087 @ static netdev_tx_t s2io_xmit(struct sk_b [skb->priority & (MAX_TX_FIFOS - 1)]; fifo = &mac_control->fifos[queue]; - if (do_spin_lock) - spin_lock_irqsave(&fifo->tx_lock, flags); - else { - if (unlikely(!spin_trylock_irqsave(&fifo->tx_lock, flags))) - return NETDEV_TX_LOCKED; - } + spin_lock_irqsave(&fifo->tx_lock, flags); if (sp->config.multiq) { if (__netif_subqueue_stopped(dev, fifo->fifo_no)) { Index: linux-3.18.13-rt10-r7s4/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c +++ linux-3.18.13-rt10-r7s4/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2140 @ static int pch_gbe_xmit_frame(struct sk_ struct pch_gbe_tx_ring *tx_ring = adapter->tx_ring; unsigned long flags; - if (!spin_trylock_irqsave(&tx_ring->tx_lock, flags)) { - /* Collision - tell upper layer to requeue */ - return NETDEV_TX_LOCKED; - } + spin_lock_irqsave(&tx_ring->tx_lock, flags); + if (unlikely(!PCH_GBE_DESC_UNUSED(tx_ring))) { netif_stop_queue(netdev); spin_unlock_irqrestore(&tx_ring->tx_lock, flags); Index: linux-3.18.13-rt10-r7s4/drivers/net/ethernet/realtek/8139too.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/ethernet/realtek/8139too.c +++ linux-3.18.13-rt10-r7s4/drivers/net/ethernet/realtek/8139too.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2218 @ 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-3.18.13-rt10-r7s4/drivers/net/ethernet/tehuti/tehuti.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/ethernet/tehuti/tehuti.c +++ linux-3.18.13-rt10-r7s4/drivers/net/ethernet/tehuti/tehuti.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1632 @ static netdev_tx_t bdx_tx_transmit(struc unsigned long flags; ENTER; - local_irq_save(flags); - if (!spin_trylock(&priv->tx_lock)) { - local_irq_restore(flags); - DBG("%s[%s]: TX locked, returning NETDEV_TX_LOCKED\n", - BDX_DRV_NAME, ndev->name); - return NETDEV_TX_LOCKED; - } + + spin_lock_irqsave(&priv->tx_lock, flags); /* build tx descriptor */ BDX_ASSERT(f->m.wptr >= f->m.memsz); /* started with valid wptr */ Index: linux-3.18.13-rt10-r7s4/drivers/net/rionet.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/rionet.c +++ linux-3.18.13-rt10-r7s4/drivers/net/rionet.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:177 @ static int rionet_start_xmit(struct sk_b unsigned long flags; int add_num = 1; - local_irq_save(flags); - if (!spin_trylock(&rnet->tx_lock)) { - local_irq_restore(flags); - return NETDEV_TX_LOCKED; - } + spin_lock_irqsave(&rnet->tx_lock, flags); if (is_multicast_ether_addr(eth->h_dest)) add_num = nets[rnet->mport->id].nact; Index: linux-3.18.13-rt10-r7s4/drivers/net/wireless/orinoco/orinoco_usb.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/net/wireless/orinoco/orinoco_usb.c +++ linux-3.18.13-rt10-r7s4/drivers/net/wireless/orinoco/orinoco_usb.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:702 @ 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-3.18.13-rt10-r7s4/drivers/pci/access.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/pci/access.c +++ linux-3.18.13-rt10-r7s4/drivers/pci/access.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:437 @ void pci_cfg_access_unlock(struct pci_de WARN_ON(!dev->block_cfg_access); dev->block_cfg_access = 0; - wake_up_all(&pci_cfg_wait); + wake_up_all_locked(&pci_cfg_wait); raw_spin_unlock_irqrestore(&pci_lock, flags); } EXPORT_SYMBOL_GPL(pci_cfg_access_unlock); Index: linux-3.18.13-rt10-r7s4/drivers/scsi/fcoe/fcoe.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/scsi/fcoe/fcoe.c +++ linux-3.18.13-rt10-r7s4/drivers/scsi/fcoe/fcoe.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1289 @ static void fcoe_percpu_thread_destroy(u struct sk_buff *skb; #ifdef CONFIG_SMP struct fcoe_percpu_s *p0; - unsigned targ_cpu = get_cpu(); + unsigned targ_cpu = get_cpu_light(); #endif /* CONFIG_SMP */ FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1345 @ static void fcoe_percpu_thread_destroy(u kfree_skb(skb); spin_unlock_bh(&p->fcoe_rx_list.lock); } - put_cpu(); + put_cpu_light(); #else /* * This a non-SMP scenario where the singular Rx thread is @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1569 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1771 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1851 @ 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-3.18.13-rt10-r7s4/drivers/scsi/fcoe/fcoe_ctlr.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/scsi/fcoe/fcoe_ctlr.c +++ linux-3.18.13-rt10-r7s4/drivers/scsi/fcoe/fcoe_ctlr.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:834 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:870 @ 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-3.18.13-rt10-r7s4/drivers/scsi/libfc/fc_exch.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/scsi/libfc/fc_exch.c +++ linux-3.18.13-rt10-r7s4/drivers/scsi/libfc/fc_exch.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:819 @ 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-3.18.13-rt10-r7s4/drivers/scsi/libsas/sas_ata.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/scsi/libsas/sas_ata.c +++ linux-3.18.13-rt10-r7s4/drivers/scsi/libsas/sas_ata.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:194 @ 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 */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:264 @ 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-3.18.13-rt10-r7s4/drivers/scsi/qla2xxx/qla_inline.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/scsi/qla2xxx/qla_inline.h +++ linux-3.18.13-rt10-r7s4/drivers/scsi/qla2xxx/qla_inline.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:62 @ 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-3.18.13-rt10-r7s4/drivers/thermal/x86_pkg_temp_thermal.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/thermal/x86_pkg_temp_thermal.c +++ linux-3.18.13-rt10-r7s4/drivers/thermal/x86_pkg_temp_thermal.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:32 @ #include <linux/pm.h> #include <linux/thermal.h> #include <linux/debugfs.h> +#include <linux/work-simple.h> #include <asm/cpu_device_id.h> #include <asm/mce.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:356 @ static void pkg_temp_thermal_threshold_w } } -static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val) +static void platform_thermal_notify_work(struct swork_event *event) { unsigned long flags; int cpu = smp_processor_id(); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:373 @ static int pkg_temp_thermal_platform_the pkg_work_scheduled[phy_id]) { disable_pkg_thres_interrupt(); spin_unlock_irqrestore(&pkg_work_lock, flags); - return -EINVAL; + return; } pkg_work_scheduled[phy_id] = 1; spin_unlock_irqrestore(&pkg_work_lock, flags); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:382 @ static int pkg_temp_thermal_platform_the schedule_delayed_work_on(cpu, &per_cpu(pkg_temp_thermal_threshold_work, cpu), msecs_to_jiffies(notify_delay_ms)); +} + +#ifdef CONFIG_PREEMPT_RT_FULL +static struct swork_event notify_work; + +static int thermal_notify_work_init(void) +{ + int err; + + err = swork_get(); + if (err) + return err; + + INIT_SWORK(¬ify_work, platform_thermal_notify_work); return 0; } +static void thermal_notify_work_cleanup(void) +{ + swork_put(); +} + +static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val) +{ + swork_queue(¬ify_work); + return 0; +} + +#else /* !CONFIG_PREEMPT_RT_FULL */ + +static int thermal_notify_work_init(void) { return 0; } + +static int thermal_notify_work_cleanup(void) { } + +static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val) +{ + platform_thermal_notify_work(NULL); + + return 0; +} +#endif /* CONFIG_PREEMPT_RT_FULL */ + static int find_siblings_cpu(int cpu) { int i; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:627 @ static int __init pkg_temp_thermal_init( if (!x86_match_cpu(pkg_temp_thermal_ids)) return -ENODEV; + if (!thermal_notify_work_init()) + return -ENODEV; + spin_lock_init(&pkg_work_lock); platform_thermal_package_notify = pkg_temp_thermal_platform_thermal_notify; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:654 @ err_ret: kfree(pkg_work_scheduled); platform_thermal_package_notify = NULL; platform_thermal_package_rate_control = NULL; - + thermal_notify_work_cleanup(); return -ENODEV; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:679 @ static void __exit pkg_temp_thermal_exit mutex_unlock(&phy_dev_list_mutex); platform_thermal_package_notify = NULL; platform_thermal_package_rate_control = NULL; + thermal_notify_work_cleanup(); for_each_online_cpu(i) cancel_delayed_work_sync( &per_cpu(pkg_temp_thermal_threshold_work, i)); Index: linux-3.18.13-rt10-r7s4/drivers/tty/serial/8250/8250_core.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/tty/serial/8250/8250_core.c +++ linux-3.18.13-rt10-r7s4/drivers/tty/serial/8250/8250_core.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:40 @ #include <linux/nmi.h> #include <linux/mutex.h> #include <linux/slab.h> +#include <linux/kdb.h> #include <linux/uaccess.h> #include <linux/pm_runtime.h> #ifdef CONFIG_SPARC @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:85 @ static unsigned int skip_txen_test; /* f #define DEBUG_INTR(fmt...) do { } while (0) #endif -#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 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3212 @ serial8250_console_write(struct console serial8250_rpm_get(up); - if (port->sysrq || oops_in_progress) + if (port->sysrq || oops_in_progress || in_kdb_printk()) locked = spin_trylock_irqsave(&port->lock, flags); else spin_lock_irqsave(&port->lock, flags); Index: linux-3.18.13-rt10-r7s4/drivers/tty/serial/amba-pl011.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/tty/serial/amba-pl011.c +++ linux-3.18.13-rt10-r7s4/drivers/tty/serial/amba-pl011.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1939 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1973 @ pl011_console_write(struct console *co, writew(old_cr, uap->port.membase + UART011_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-3.18.13-rt10-r7s4/drivers/tty/serial/omap-serial.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/tty/serial/omap-serial.c +++ linux-3.18.13-rt10-r7s4/drivers/tty/serial/omap-serial.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1273 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1305 @ 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-3.18.13-rt10-r7s4/drivers/usb/core/hcd.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/usb/core/hcd.c +++ linux-3.18.13-rt10-r7s4/drivers/usb/core/hcd.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1684 @ 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-3.18.13-rt10-r7s4/drivers/usb/gadget/function/f_fs.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/usb/gadget/function/f_fs.c +++ linux-3.18.13-rt10-r7s4/drivers/usb/gadget/function/f_fs.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1431 @ 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)); + swaitqueue_active(&ffs->ep0req_completion.wait)); kfree(ffs->dev_name); kfree(ffs); } Index: linux-3.18.13-rt10-r7s4/drivers/usb/gadget/legacy/inode.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/drivers/usb/gadget/legacy/inode.c +++ linux-3.18.13-rt10-r7s4/drivers/usb/gadget/legacy/inode.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:342 @ 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)) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:351 @ 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-3.18.13-rt10-r7s4/fs/aio.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/aio.c +++ linux-3.18.13-rt10-r7s4/fs/aio.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:43 @ #include <linux/ramfs.h> #include <linux/percpu-refcount.h> #include <linux/mount.h> +#include <linux/work-simple.h> #include <asm/kmap_types.h> #include <asm/uaccess.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:114 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:230 @ 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."); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:510 @ static int kiocb_cancel(struct kiocb *ki return cancel(kiocb); } -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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:531 @ static void free_ioctx_reqs(struct percp if (ctx->requests_done) complete(ctx->requests_done); - INIT_WORK(&ctx->free_work, free_ioctx); - schedule_work(&ctx->free_work); + INIT_SWORK(&ctx->free_work, free_ioctx); + swork_queue(&ctx->free_work); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:540 @ 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 kiocb *req; spin_lock_irq(&ctx->ctx_lock); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:561 @ 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-3.18.13-rt10-r7s4/fs/autofs4/autofs_i.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/autofs4/autofs_i.h +++ linux-3.18.13-rt10-r7s4/fs/autofs4/autofs_i.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:37 @ #include <linux/sched.h> #include <linux/mount.h> #include <linux/namei.h> +#include <linux/delay.h> #include <asm/current.h> #include <asm/uaccess.h> Index: linux-3.18.13-rt10-r7s4/fs/autofs4/expire.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/autofs4/expire.c +++ linux-3.18.13-rt10-r7s4/fs/autofs4/expire.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:154 @ 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-3.18.13-rt10-r7s4/fs/buffer.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/buffer.c +++ linux-3.18.13-rt10-r7s4/fs/buffer.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:304 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:317 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:329 @ 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); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:357 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:369 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3320 @ 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-3.18.13-rt10-r7s4/fs/dcache.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/dcache.c +++ linux-3.18.13-rt10-r7s4/fs/dcache.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:22 @ #include <linux/mm.h> #include <linux/fs.h> #include <linux/fsnotify.h> +#include <linux/delay.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/hash.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:556 @ static struct dentry *dentry_kill(struct failed: spin_unlock(&dentry->d_lock); - cpu_relax(); + cpu_chill(); return dentry; /* try again with same dentry */ } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2289 @ 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; Index: linux-3.18.13-rt10-r7s4/fs/eventpoll.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/eventpoll.c +++ linux-3.18.13-rt10-r7s4/fs/eventpoll.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:508 @ 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-3.18.13-rt10-r7s4/fs/exec.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/exec.c +++ linux-3.18.13-rt10-r7s4/fs/exec.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:844 @ 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-3.18.13-rt10-r7s4/fs/jbd/checkpoint.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/jbd/checkpoint.c +++ linux-3.18.13-rt10-r7s4/fs/jbd/checkpoint.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:132 @ void __log_wait_for_space(journal_t *jou if (journal->j_flags & JFS_ABORT) return; spin_unlock(&journal->j_state_lock); + if (current->plug) + io_schedule(); mutex_lock(&journal->j_checkpoint_mutex); /* Index: linux-3.18.13-rt10-r7s4/fs/jbd2/checkpoint.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/jbd2/checkpoint.c +++ linux-3.18.13-rt10-r7s4/fs/jbd2/checkpoint.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:119 @ void __jbd2_log_wait_for_space(journal_t nblocks = jbd2_space_needed(journal); while (jbd2_log_space_left(journal) < nblocks) { write_unlock(&journal->j_state_lock); + if (current->plug) + io_schedule(); mutex_lock(&journal->j_checkpoint_mutex); /* Index: linux-3.18.13-rt10-r7s4/fs/namespace.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/namespace.c +++ linux-3.18.13-rt10-r7s4/fs/namespace.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:17 @ #include <linux/mnt_namespace.h> #include <linux/user_namespace.h> #include <linux/namei.h> +#include <linux/delay.h> #include <linux/security.h> #include <linux/idr.h> #include <linux/init.h> /* init_rootfs */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:348 @ 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-3.18.13-rt10-r7s4/fs/ntfs/aops.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/ntfs/aops.c +++ linux-3.18.13-rt10-r7s4/fs/ntfs/aops.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:110 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:125 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:146 @ static void ntfs_end_buffer_async_read(s recs = PAGE_CACHE_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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:160 @ 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-3.18.13-rt10-r7s4/fs/timerfd.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/timerfd.c +++ linux-3.18.13-rt10-r7s4/fs/timerfd.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:452 @ 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-3.18.13-rt10-r7s4/fs/xfs/xfs_linux.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/fs/xfs/xfs_linux.h +++ linux-3.18.13-rt10-r7s4/fs/xfs/xfs_linux.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:122 @ typedef __uint64_t __psunsigned_t; /* * Feature macros (disable/enable) */ -#ifdef CONFIG_SMP +#if defined(CONFIG_SMP) && !defined(CONFIG_PREEMPT_RT_FULL) #define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */ #else #undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */ Index: linux-3.18.13-rt10-r7s4/include/acpi/platform/aclinux.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/acpi/platform/aclinux.h +++ linux-3.18.13-rt10-r7s4/include/acpi/platform/aclinux.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:126 @ #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 */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:145 @ #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-3.18.13-rt10-r7s4/include/asm-generic/bug.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/asm-generic/bug.h +++ linux-3.18.13-rt10-r7s4/include/asm-generic/bug.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:209 @ extern void warn_slowpath_null(const cha # 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-3.18.13-rt10-r7s4/include/linux/blk-mq.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/blk-mq.h +++ linux-3.18.13-rt10-r7s4/include/linux/blk-mq.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:172 @ struct request *blk_mq_tag_to_rq(struct struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index); struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int); +void __blk_mq_complete_request_remote_work(struct work_struct *work); void blk_mq_start_request(struct request *rq); void blk_mq_end_request(struct request *rq, int error); Index: linux-3.18.13-rt10-r7s4/include/linux/blkdev.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/blkdev.h +++ linux-3.18.13-rt10-r7s4/include/linux/blkdev.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:104 @ struct request { struct list_head queuelist; union { struct call_single_data csd; + struct work_struct work; unsigned long fifo_time; }; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:482 @ struct request_queue { struct throtl_data *td; #endif struct rcu_head rcu_head; - wait_queue_head_t mq_freeze_wq; + struct swait_head mq_freeze_wq; struct percpu_ref mq_usage_counter; struct list_head all_q_node; Index: linux-3.18.13-rt10-r7s4/include/linux/bottom_half.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/bottom_half.h +++ linux-3.18.13-rt10-r7s4/include/linux/bottom_half.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:7 @ #include <linux/preempt.h> #include <linux/preempt_mask.h> +#ifdef CONFIG_PREEMPT_RT_FULL + +extern void local_bh_disable(void); +extern void _local_bh_enable(void); +extern void local_bh_enable(void); +extern void local_bh_enable_ip(unsigned long ip); +extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt); +extern void __local_bh_enable_ip(unsigned long ip, unsigned int cnt); + +#else + #ifdef CONFIG_TRACE_IRQFLAGS extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt); #else @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:45 @ static inline void local_bh_enable(void) { __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET); } +#endif #endif /* _LINUX_BH_H */ Index: linux-3.18.13-rt10-r7s4/include/linux/buffer_head.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/buffer_head.h +++ linux-3.18.13-rt10-r7s4/include/linux/buffer_head.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:78 @ 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 defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE) || \ + defined(CONFIG_JBD2) || defined(CONFIG_JBD2_MODULE) + 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 defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE) || \ + defined(CONFIG_JBD2) || defined(CONFIG_JBD2_MODULE) + 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-3.18.13-rt10-r7s4/include/linux/cgroup.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/cgroup.h +++ linux-3.18.13-rt10-r7s4/include/linux/cgroup.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:25 @ #include <linux/seq_file.h> #include <linux/kernfs.h> #include <linux/wait.h> +#include <linux/work-simple.h> #ifdef CONFIG_CGROUPS @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:95 @ 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; }; /* bits in struct cgroup_subsys_state flags field */ Index: linux-3.18.13-rt10-r7s4/include/linux/completion.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/completion.h +++ linux-3.18.13-rt10-r7s4/include/linux/completion.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:10 @ * Atomic wait-for-completion handler data structures. * See kernel/sched/completion.c for details. */ - -#include <linux/wait.h> +#include <linux/wait-simple.h> /* * struct completion - structure used to maintain state for a "completion" @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:26 @ */ struct completion { unsigned int done; - wait_queue_head_t wait; + struct swait_head wait; }; #define COMPLETION_INITIALIZER(work) \ - { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) } + { 0, SWAIT_HEAD_INITIALIZER((work).wait) } #define COMPLETION_INITIALIZER_ONSTACK(work) \ ({ init_completion(&work); work; }) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:75 @ struct completion { static inline void init_completion(struct completion *x) { x->done = 0; - init_waitqueue_head(&x->wait); + init_swait_head(&x->wait); } /** Index: linux-3.18.13-rt10-r7s4/include/linux/cpu.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/cpu.h +++ linux-3.18.13-rt10-r7s4/include/linux/cpu.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:220 @ extern bool try_get_online_cpus(void); extern void put_online_cpus(void); extern void cpu_hotplug_disable(void); extern void cpu_hotplug_enable(void); +extern void pin_current_cpu(void); +extern void unpin_current_cpu(void); #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) #define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri) #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:240 @ static inline void cpu_hotplug_done(void #define put_online_cpus() do { } while (0) #define cpu_hotplug_disable() do { } while (0) #define cpu_hotplug_enable() do { } while (0) +static inline void pin_current_cpu(void) { } +static inline void unpin_current_cpu(void) { } #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) #define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) /* These aren't inline functions due to a GCC bug. */ Index: linux-3.18.13-rt10-r7s4/include/linux/delay.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/delay.h +++ linux-3.18.13-rt10-r7s4/include/linux/delay.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:55 @ 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-3.18.13-rt10-r7s4/include/linux/ftrace_event.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/ftrace_event.h +++ linux-3.18.13-rt10-r7s4/include/linux/ftrace_event.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:64 @ 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 FTRACE_MAX_EVENT \ Index: linux-3.18.13-rt10-r7s4/include/linux/highmem.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/highmem.h +++ linux-3.18.13-rt10-r7s4/include/linux/highmem.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:10 @ #include <linux/mm.h> #include <linux/uaccess.h> #include <linux/hardirq.h> +#include <linux/sched.h> #include <asm/cacheflush.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:89 @ 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-3.18.13-rt10-r7s4/include/linux/hrtimer.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/hrtimer.h +++ linux-3.18.13-rt10-r7s4/include/linux/hrtimer.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:114 @ struct hrtimer { enum hrtimer_restart (*function)(struct hrtimer *); struct hrtimer_clock_base *base; unsigned long state; + struct list_head cb_entry; + int irqsafe; +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST + ktime_t praecox; +#endif #ifdef CONFIG_TIMER_STATS int start_pid; void *start_site; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:155 @ struct hrtimer_clock_base { int index; clockid_t clockid; struct timerqueue_head active; + struct list_head expired; ktime_t resolution; ktime_t (*get_time)(void); ktime_t softirq_time; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:201 @ struct hrtimer_cpu_base { unsigned long nr_hangs; ktime_t max_hang_time; #endif +#ifdef CONFIG_PREEMPT_RT_BASE + wait_queue_head_t wait; +#endif struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; }; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:391 @ static inline int hrtimer_restart(struct return 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); extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp); Index: linux-3.18.13-rt10-r7s4/include/linux/idr.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/idr.h +++ linux-3.18.13-rt10-r7s4/include/linux/idr.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:98 @ bool idr_is_empty(struct idr *idp); * Each idr_preload() should be matched with an invocation of this * function. See idr_preload() for details. */ +#ifdef CONFIG_PREEMPT_RT_FULL +void idr_preload_end(void); +#else static inline void idr_preload_end(void) { preempt_enable(); } +#endif /** * idr_find - return pointer for given id Index: linux-3.18.13-rt10-r7s4/include/linux/init_task.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/init_task.h +++ linux-3.18.13-rt10-r7s4/include/linux/init_task.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:150 @ extern struct task_group root_task_group # define INIT_PERF_EVENTS(tsk) #endif +#ifdef 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_seqlock = __SEQLOCK_UNLOCKED(tsk.vtime_seqlock), \ + .vtime_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.vtime_lock), \ + .vtime_seq = SEQCNT_ZERO(tsk.vtime_seq), \ .vtime_snap = 0, \ .vtime_snap_whence = VTIME_SYS, #else @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:229 @ extern struct task_group root_task_group .cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \ .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-3.18.13-rt10-r7s4/include/linux/interrupt.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/interrupt.h +++ linux-3.18.13-rt10-r7s4/include/linux/interrupt.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:64 @ * 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_DISABLED 0x00000020 #define IRQF_SHARED 0x00000080 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:79 @ #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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:190 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:220 @ struct irq_affinity_notify { unsigned int irq; struct kref kref; struct work_struct work; + struct list_head list; void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask); void (*release)(struct kref *ref); }; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:369 @ static inline int disable_irq_wake(unsig #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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:431 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:443 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:453 @ extern void __raise_softirq_irqoff(unsig 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:475 @ 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. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:502 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:580 @ 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); -} - -static inline void tasklet_hi_enable(struct tasklet_struct *t) -{ - smp_mb__before_atomic(); - atomic_dec(&t->count); -} +extern void tasklet_enable(struct tasklet_struct *t); +extern void tasklet_hi_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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:613 @ void tasklet_hrtimer_cancel(struct taskl 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-3.18.13-rt10-r7s4/include/linux/irq.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/irq.h +++ linux-3.18.13-rt10-r7s4/include/linux/irq.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:76 @ typedef void (*irq_preflow_handler_t)(st * 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) */ enum { IRQ_TYPE_NONE = 0x00000000, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:102 @ enum { IRQ_NOTHREAD = (1 << 16), IRQ_PER_CPU_DEVID = (1 << 17), IRQ_IS_POLLED = (1 << 18), + IRQ_NO_SOFTIRQ_CALL = (1 << 19), }; #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_IS_POLLED | IRQ_NO_SOFTIRQ_CALL) #define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING) Index: linux-3.18.13-rt10-r7s4/include/linux/irq_work.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/irq_work.h +++ linux-3.18.13-rt10-r7s4/include/linux/irq_work.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:19 @ #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; Index: linux-3.18.13-rt10-r7s4/include/linux/irqdesc.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/irqdesc.h +++ linux-3.18.13-rt10-r7s4/include/linux/irqdesc.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:66 @ 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; #ifdef CONFIG_SMP Index: linux-3.18.13-rt10-r7s4/include/linux/irqflags.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/irqflags.h +++ linux-3.18.13-rt10-r7s4/include/linux/irqflags.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:28 @ # define trace_softirqs_enabled(p) ((p)->softirqs_enabled) # define trace_hardirq_enter() do { current->hardirq_context++; } while (0) # define trace_hardirq_exit() do { current->hardirq_context--; } while (0) -# define lockdep_softirq_enter() do { current->softirq_context++; } while (0) -# define lockdep_softirq_exit() do { current->softirq_context--; } while (0) # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1, #else # define trace_hardirqs_on() do { } while (0) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:40 @ # 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++; } while (0) +# define lockdep_softirq_exit() do { current->softirq_context--; } 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) || \ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:154 @ #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ +/* + * 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-3.18.13-rt10-r7s4/include/linux/jbd_common.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/jbd_common.h +++ linux-3.18.13-rt10-r7s4/include/linux/jbd_common.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:18 @ 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 } #endif Index: linux-3.18.13-rt10-r7s4/include/linux/jump_label.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/jump_label.h +++ linux-3.18.13-rt10-r7s4/include/linux/jump_label.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:58 @ extern bool static_key_initialized; "%s used before call to jump_label_init", \ __func__) -#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) +#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) && \ + !defined(CONFIG_PREEMPT_BASE) struct static_key { atomic_t enabled; Index: linux-3.18.13-rt10-r7s4/include/linux/kdb.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/kdb.h +++ linux-3.18.13-rt10-r7s4/include/linux/kdb.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:119 @ extern int kdb_trap_printk; extern __printf(1, 0) int vkdb_printf(const char *fmt, va_list args); 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 */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:154 @ extern int kdb_register_repeat(char *, k 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-3.18.13-rt10-r7s4/include/linux/kernel.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/kernel.h +++ linux-3.18.13-rt10-r7s4/include/linux/kernel.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:454 @ extern enum system_states { SYSTEM_HALT, SYSTEM_POWER_OFF, SYSTEM_RESTART, + SYSTEM_SUSPEND, } system_state; #define TAINT_PROPRIETARY_MODULE 0 Index: linux-3.18.13-rt10-r7s4/include/linux/kvm_host.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/kvm_host.h +++ linux-3.18.13-rt10-r7s4/include/linux/kvm_host.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:247 @ struct kvm_vcpu { int fpu_active; int guest_fpu_loaded, guest_xcr0_loaded; - wait_queue_head_t wq; + struct swait_head wq; struct pid *pid; int sigset_active; sigset_t sigset; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:690 @ static inline bool kvm_arch_has_noncoher } #endif -static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu) +static inline struct swait_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu) { #ifdef __KVM_HAVE_ARCH_WQP return vcpu->arch.wqp; Index: linux-3.18.13-rt10-r7s4/include/linux/lglock.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/lglock.h +++ linux-3.18.13-rt10-r7s4/include/linux/lglock.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:37 @ #endif struct lglock { +#ifndef CONFIG_PREEMPT_RT_FULL arch_spinlock_t __percpu *lock; +#else + struct rt_mutex __percpu *lock; +#endif #ifdef CONFIG_DEBUG_LOCK_ALLOC struct lock_class_key lock_key; struct lockdep_map lock_dep_map; #endif }; -#define DEFINE_LGLOCK(name) \ +#ifndef CONFIG_PREEMPT_RT_FULL +# define DEFINE_LGLOCK(name) \ static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock) \ = __ARCH_SPIN_LOCK_UNLOCKED; \ struct lglock name = { .lock = &name ## _lock } -#define DEFINE_STATIC_LGLOCK(name) \ +# define DEFINE_STATIC_LGLOCK(name) \ static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock) \ = __ARCH_SPIN_LOCK_UNLOCKED; \ static struct lglock name = { .lock = &name ## _lock } +#else + +# define DEFINE_LGLOCK(name) \ + static DEFINE_PER_CPU(struct rt_mutex, name ## _lock) \ + = __RT_MUTEX_INITIALIZER( name ## _lock); \ + struct lglock name = { .lock = &name ## _lock } + +# define DEFINE_STATIC_LGLOCK(name) \ + static DEFINE_PER_CPU(struct rt_mutex, name ## _lock) \ + = __RT_MUTEX_INITIALIZER( name ## _lock); \ + static struct lglock name = { .lock = &name ## _lock } +#endif void lg_lock_init(struct lglock *lg, char *name); void lg_local_lock(struct lglock *lg); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:79 @ void lg_local_unlock_cpu(struct lglock * void lg_global_lock(struct lglock *lg); void lg_global_unlock(struct lglock *lg); +#ifndef CONFIG_PREEMPT_RT_FULL +#define lg_global_trylock_relax(name) lg_global_lock(name) +#else +void lg_global_trylock_relax(struct lglock *lg); +#endif + #else /* When !CONFIG_SMP, map lglock to spinlock */ #define lglock spinlock Index: linux-3.18.13-rt10-r7s4/include/linux/list_bl.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/list_bl.h +++ linux-3.18.13-rt10-r7s4/include/linux/list_bl.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:5 @ #define _LINUX_LIST_BL_H #include <linux/list.h> +#include <linux/spinlock.h> #include <linux/bit_spinlock.h> /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:36 @ 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) + +static inline void INIT_HLIST_BL_HEAD(struct hlist_bl_head *h) +{ + h->first = NULL; +#ifdef CONFIG_PREEMPT_RT_BASE + raw_spin_lock_init(&h->lock); +#endif +} static inline void INIT_HLIST_BL_NODE(struct hlist_bl_node *h) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:130 @ 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-3.18.13-rt10-r7s4/include/linux/locallock.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/locallock.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#ifndef _LINUX_LOCALLOCK_H +#define _LINUX_LOCALLOCK_H + +#include <linux/percpu.h> +#include <linux/spinlock.h> + +#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) + +/* + * spin_lock|trylock|unlock_local flavour that does not migrate disable + * used for __local_lock|trylock|unlock where get_local_var/put_local_var + * already takes care of the migrate_disable/enable + * for CONFIG_PREEMPT_BASE map to the normal spin_* calls. + */ +#ifdef CONFIG_PREEMPT_RT_FULL +# define spin_lock_local(lock) rt_spin_lock(lock) +# define spin_trylock_local(lock) rt_spin_trylock(lock) +# define spin_unlock_local(lock) rt_spin_unlock(lock) +#else +# define spin_lock_local(lock) spin_lock(lock) +# define spin_trylock_local(lock) spin_trylock(lock) +# define spin_unlock_local(lock) spin_unlock(lock) +#endif + +static inline void __local_lock(struct local_irq_lock *lv) +{ + if (lv->owner != current) { + spin_lock_local(&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) + +static inline int __local_trylock(struct local_irq_lock *lv) +{ + if (lv->owner != current && spin_trylock_local(&lv->lock)) { + LL_WARN(lv->owner); + LL_WARN(lv->nestcnt); + lv->owner = current; + lv->nestcnt = 1; + 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_local(&lv->lock); +} + +#define local_unlock(lvar) \ + do { \ + __local_unlock(&__get_cpu_var(lvar)); \ + put_local_var(lvar); \ + } 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(&__get_cpu_var(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 = __get_cpu_var(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(&__get_cpu_var(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); \ + &__get_cpu_var(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_lock(lvar) preempt_disable() +#define local_unlock(lvar) preempt_enable() +#define local_lock_irq(lvar) local_irq_disable() +#define local_unlock_irq(lvar) 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-3.18.13-rt10-r7s4/include/linux/mm_types.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/mm_types.h +++ linux-3.18.13-rt10-r7s4/include/linux/mm_types.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:14 @ #include <linux/completion.h> #include <linux/cpumask.h> #include <linux/page-debug-flags.h> +#include <linux/rcupdate.h> #include <linux/uprobes.h> #include <linux/page-flags-layout.h> #include <asm/page.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:458 @ struct mm_struct { bool tlb_flush_pending; #endif struct uprobes_state uprobes_state; +#ifdef CONFIG_PREEMPT_RT_BASE + struct rcu_head delayed_drop; +#endif }; static inline void mm_init_cpumask(struct mm_struct *mm) Index: linux-3.18.13-rt10-r7s4/include/linux/mutex.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/mutex.h +++ linux-3.18.13-rt10-r7s4/include/linux/mutex.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:22 @ #include <asm/processor.h> #include <linux/osq_lock.h> +#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 <linux/mutex_rt.h> +#else + /* * Simple, straightforward mutexes with strict semantics: * @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:114 @ do { \ static inline void mutex_destroy(struct mutex *lock) {} #endif -#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) \ { .count = ATOMIC_INIT(1) \ , .wait_lock = __SPIN_LOCK_UNLOCKED(lockname.wait_lock) \ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:181 @ extern int __must_check mutex_lock_killa extern int mutex_trylock(struct mutex *lock); extern void mutex_unlock(struct mutex *lock); +#endif /* !PREEMPT_RT_FULL */ + extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock); #endif /* __LINUX_MUTEX_H */ Index: linux-3.18.13-rt10-r7s4/include/linux/mutex_rt.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/mutex_rt.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#ifndef __LINUX_MUTEX_RT_H +#define __LINUX_MUTEX_RT_H + +#ifndef __LINUX_MUTEX_H +#error "Please include mutex.h" +#endif + +#include <linux/rtmutex.h> + +/* FIXME: Just for __lockfunc */ +#include <linux/spinlock.h> + +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 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_destroy(l) rt_mutex_destroy(&(l)->lock) + +#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_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) +#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) + +#endif Index: linux-3.18.13-rt10-r7s4/include/linux/netdevice.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/netdevice.h +++ linux-3.18.13-rt10-r7s4/include/linux/netdevice.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2354 @ struct softnet_data { unsigned int dropped; struct sk_buff_head input_pkt_queue; struct napi_struct backlog; + struct sk_buff_head tofree_queue; #ifdef CONFIG_NET_FLOW_LIMIT struct sd_flow_limit __rcu *flow_limit; Index: linux-3.18.13-rt10-r7s4/include/linux/netfilter/x_tables.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/netfilter/x_tables.h +++ linux-3.18.13-rt10-r7s4/include/linux/netfilter/x_tables.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:6 @ #include <linux/netdevice.h> +#include <linux/locallock.h> #include <uapi/linux/netfilter/x_tables.h> /** @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:286 @ void xt_free_table_info(struct xt_table_ */ DECLARE_PER_CPU(seqcount_t, xt_recseq); +DECLARE_LOCAL_IRQ_LOCK(xt_write_lock); + /** * xt_write_recseq_begin - start of a write section * @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:302 @ 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(). @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:335 @ 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-3.18.13-rt10-r7s4/include/linux/notifier.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/notifier.h +++ linux-3.18.13-rt10-r7s4/include/linux/notifier.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:9 @ * * Alan Cox <Alan.Cox@linux.org> */ - + #ifndef _LINUX_NOTIFIER_H #define _LINUX_NOTIFIER_H #include <linux/errno.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:45 @ * 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. */ typedef int (*notifier_fn_t)(struct notifier_block *nb, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:89 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:102 @ 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 = \ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:120 @ extern void srcu_init_notifier_head(stru struct raw_notifier_head name = \ RAW_NOTIFIER_INIT(name) +#define _SRCU_NOTIFIER_HEAD(name, mod) \ + static DEFINE_PER_CPU(struct srcu_struct_array, \ + name##_head_srcu_array); \ + mod struct srcu_notifier_head name = \ + SRCU_NOTIFIER_INIT(name, name##_head_srcu_array) + +#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, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:201 @ 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-3.18.13-rt10-r7s4/include/linux/percpu.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/percpu.h +++ linux-3.18.13-rt10-r7s4/include/linux/percpu.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:26 @ PERCPU_MODULE_RESERVE) #endif +#ifdef CONFIG_PREEMPT_RT_FULL + +#define get_local_var(var) (*({ \ + migrate_disable(); \ + &__get_cpu_var(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-3.18.13-rt10-r7s4/include/linux/pid.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/pid.h +++ linux-3.18.13-rt10-r7s4/include/linux/pid.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:5 @ #define _LINUX_PID_H #include <linux/rcupdate.h> +#include <linux/atomic.h> enum pid_type { Index: linux-3.18.13-rt10-r7s4/include/linux/preempt.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/preempt.h +++ linux-3.18.13-rt10-r7s4/include/linux/preempt.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:36 @ 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() \ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:58 @ 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 #ifdef CONFIG_PREEMPT #define preempt_enable() \ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:92 @ do { \ __preempt_schedule(); \ } while (0) +#define preempt_lazy_enable() \ +do { \ + dec_preempt_lazy_count(); \ + barrier(); \ + preempt_check_resched(); \ +} while (0) + #else #define preempt_enable() \ do { \ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:157 @ do { \ #define preempt_disable_notrace() barrier() #define preempt_enable_no_resched_notrace() barrier() #define preempt_enable_notrace() barrier() +#define preempt_check_resched_rt() barrier() #endif /* CONFIG_PREEMPT_COUNT */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:177 @ 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() +# ifdef CONFIG_SMP + extern void migrate_disable(void); + extern void migrate_enable(void); +# else /* CONFIG_SMP */ +# define migrate_disable() barrier() +# define migrate_enable() barrier() +# endif /* CONFIG_SMP */ +#else +# define preempt_disable_rt() barrier() +# define preempt_enable_rt() barrier() +# define preempt_disable_nort() preempt_disable() +# define preempt_enable_nort() preempt_enable() +# define migrate_disable() preempt_disable() +# define migrate_enable() preempt_enable() +#endif + #ifdef CONFIG_PREEMPT_NOTIFIERS struct preempt_notifier; Index: linux-3.18.13-rt10-r7s4/include/linux/preempt_mask.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/preempt_mask.h +++ linux-3.18.13-rt10-r7s4/include/linux/preempt_mask.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:47 @ #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 #define PREEMPT_ACTIVE_BITS 1 #define PREEMPT_ACTIVE_SHIFT (NMI_SHIFT + NMI_BITS) #define PREEMPT_ACTIVE (__IRQ_MASK(PREEMPT_ACTIVE_BITS) << PREEMPT_ACTIVE_SHIFT) #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? @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:77 @ #define in_irq() (hardirq_count()) #define in_softirq() (softirq_count()) #define in_interrupt() (irq_count()) -#define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET) /* * Are we in NMI context? Index: linux-3.18.13-rt10-r7s4/include/linux/printk.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/printk.h +++ linux-3.18.13-rt10-r7s4/include/linux/printk.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:122 @ int no_printk(const char *fmt, ...) extern asmlinkage __printf(1, 2) void early_printk(const char *fmt, ...); void early_vprintk(const char *fmt, va_list ap); +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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:160 @ extern int __printk_ratelimit(const char #define printk_ratelimit() __printk_ratelimit(__func__) extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, unsigned int interval_msec); - extern int printk_delay_msec; extern int dmesg_restrict; extern int kptr_restrict; Index: linux-3.18.13-rt10-r7s4/include/linux/radix-tree.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/radix-tree.h +++ linux-3.18.13-rt10-r7s4/include/linux/radix-tree.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:280 @ radix_tree_gang_lookup(struct radix_tree unsigned int radix_tree_gang_lookup_slot(struct radix_tree_root *root, void ***results, unsigned long *indices, unsigned long first_index, unsigned int max_items); +#ifndef CONFIG_PREEMPT_RT_FULL int radix_tree_preload(gfp_t gfp_mask); int radix_tree_maybe_preload(gfp_t gfp_mask); +#else +static inline int radix_tree_preload(gfp_t gm) { return 0; } +static inline int radix_tree_maybe_preload(gfp_t gfp_mask) { return 0; } +#endif void radix_tree_init(void); void *radix_tree_tag_set(struct radix_tree_root *root, unsigned long index, unsigned int tag); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:311 @ unsigned long radix_tree_locate_item(str static inline void radix_tree_preload_end(void) { - preempt_enable(); + preempt_enable_nort(); } /** Index: linux-3.18.13-rt10-r7s4/include/linux/random.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/random.h +++ linux-3.18.13-rt10-r7s4/include/linux/random.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:14 @ extern void add_device_randomness(const void *, unsigned int); extern void add_input_randomness(unsigned int type, unsigned int code, unsigned int value); -extern void add_interrupt_randomness(int irq, int irq_flags); +extern void add_interrupt_randomness(int irq, int irq_flags, __u64 ip); extern void get_random_bytes(void *buf, int nbytes); extern void get_random_bytes_arch(void *buf, int nbytes); Index: linux-3.18.13-rt10-r7s4/include/linux/rcupdate.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/rcupdate.h +++ linux-3.18.13-rt10-r7s4/include/linux/rcupdate.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:150 @ void call_rcu(struct rcu_head *head, #endif /* #else #ifdef CONFIG_PREEMPT_RCU */ +#ifdef CONFIG_PREEMPT_RT_FULL +#define call_rcu_bh call_rcu +#else /** * call_rcu_bh() - Queue an RCU for invocation after a quicker grace period. * @head: structure to be used for queueing the RCU updates. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:176 @ void call_rcu(struct rcu_head *head, */ void call_rcu_bh(struct rcu_head *head, void (*func)(struct rcu_head *head)); +#endif /** * call_rcu_sched() - Queue an RCU for invocation after sched grace period. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:238 @ 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 */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:266 @ 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 */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:444 @ extern struct lockdep_map rcu_callback_m 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 /** * rcu_read_lock_sched_held() - might we be in RCU-sched read-side critical section? @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:976 @ 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_assert(rcu_is_watching(), "rcu_read_lock_bh() used illegally while idle"); +#endif } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:993 @ 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_assert(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-3.18.13-rt10-r7s4/include/linux/rcutree.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/rcutree.h +++ linux-3.18.13-rt10-r7s4/include/linux/rcutree.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:49 @ static inline void rcu_virt_note_context rcu_note_context_switch(cpu); } +#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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:81 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:93 @ void cond_synchronize_rcu(unsigned long extern unsigned long rcutorture_testseq; extern unsigned long rcutorture_vernum; long rcu_batches_completed(void); -long rcu_batches_completed_bh(void); long rcu_batches_completed_sched(void); 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); void exit_rcu(void); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:106 @ extern int rcu_scheduler_active __read_m bool rcu_is_watching(void); +#ifndef CONFIG_PREEMPT_RT_FULL +void rcu_bh_force_quiescent_state(void); +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 +#endif + #endif /* __LINUX_RCUTREE_H */ Index: linux-3.18.13-rt10-r7s4/include/linux/rtmutex.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/rtmutex.h +++ linux-3.18.13-rt10-r7s4/include/linux/rtmutex.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:17 @ #include <linux/linkage.h> #include <linux/rbtree.h> -#include <linux/spinlock_types.h> +#include <linux/spinlock_types_raw.h> extern int max_lock_depth; /* for sysctl */ +#ifdef CONFIG_DEBUG_MUTEXES +#include <linux/debug_locks.h> +#endif + /** * The rt_mutex structure * @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:38 @ struct rt_mutex { struct rb_root waiters; struct rb_node *waiters_leftmost; 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:62 @ struct hrtimer_sleeper; # define rt_mutex_debug_check_no_locks_held(task) do { } while (0) #endif +# define rt_mutex_init(mutex) \ + do { \ + raw_spin_lock_init(&(mutex)->wait_lock); \ + __rt_mutex_init(mutex, #mutex); \ + } while (0) + #ifdef CONFIG_DEBUG_RT_MUTEXES # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \ , .name = #mutexname, .file = __FILE__, .line = __LINE__ -# define rt_mutex_init(mutex) __rt_mutex_init(mutex, __func__) extern void rt_mutex_debug_task_free(struct task_struct *tsk); #else # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) -# define rt_mutex_init(mutex) __rt_mutex_init(mutex, NULL) # define rt_mutex_debug_task_free(t) do { } while (0) #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 \ , .owner = NULL \ - __DEBUG_RT_MUTEX_INITIALIZER(mutexname)} + __DEBUG_RT_MUTEX_INITIALIZER(mutexname) + +#define __RT_MUTEX_INITIALIZER(mutexname) \ + { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) } + +#define __RT_MUTEX_INITIALIZER_SAVE_STATE(mutexname) \ + { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) \ + , .save_state = 1 } #define DEFINE_RT_MUTEX(mutexname) \ struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:109 @ 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-3.18.13-rt10-r7s4/include/linux/rwlock_rt.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/rwlock_rt.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#ifndef __LINUX_RWLOCK_RT_H +#define __LINUX_RWLOCK_RT_H + +#ifndef __LINUX_SPINLOCK_H +#error Do not include directly. Use spinlock.h +#endif + +#define rwlock_init(rwl) \ +do { \ + static struct lock_class_key __key; \ + \ + rt_mutex_init(&(rwl)->lock); \ + __rt_rwlock_init(rwl, #rwl, &__key); \ +} while (0) + +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_write_trylock_irqsave(rwlock_t *trylock, unsigned long *flags); +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 unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock); +extern unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock); +extern void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key); + +#define read_trylock(lock) __cond_lock(lock, rt_read_trylock(lock)) +#define write_trylock(lock) __cond_lock(lock, rt_write_trylock(lock)) + +#define write_trylock_irqsave(lock, flags) \ + __cond_lock(lock, rt_write_trylock_irqsave(lock, &flags)) + +#define read_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + flags = rt_read_lock_irqsave(lock); \ + } while (0) + +#define write_lock_irqsave(lock, flags) \ + do { \ + typecheck(unsigned long, flags); \ + flags = rt_write_lock_irqsave(lock); \ + } 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) + +#endif Index: linux-3.18.13-rt10-r7s4/include/linux/rwlock_types.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/rwlock_types.h +++ linux-3.18.13-rt10-r7s4/include/linux/rwlock_types.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ #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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:50 @ typedef struct { RW_DEP_MAP_INIT(lockname) } #endif -#define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x) +#define DEFINE_RWLOCK(name) \ + rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name) #endif /* __LINUX_RWLOCK_TYPES_H */ Index: linux-3.18.13-rt10-r7s4/include/linux/rwlock_types_rt.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/rwlock_types_rt.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#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 + +/* + * rwlocks - rtmutex which allows single reader recursion + */ +typedef struct { + struct rt_mutex lock; + int read_depth; + unsigned int break_lock; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +} rwlock_t; + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } +#else +# define RW_DEP_MAP_INIT(lockname) +#endif + +#define __RW_LOCK_UNLOCKED(name) \ + { .lock = __RT_MUTEX_INITIALIZER_SAVE_STATE(name.lock), \ + RW_DEP_MAP_INIT(name) } + +#define DEFINE_RWLOCK(name) \ + rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name) + +#endif Index: linux-3.18.13-rt10-r7s4/include/linux/rwsem.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/rwsem.h +++ linux-3.18.13-rt10-r7s4/include/linux/rwsem.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:21 @ #include <linux/osq_lock.h> #endif +#ifdef CONFIG_PREEMPT_RT_FULL +#include <linux/rwsem_rt.h> +#else /* PREEMPT_RT_FULL */ + struct rw_semaphore; #ifdef CONFIG_RWSEM_GENERIC_SPINLOCK @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:184 @ extern void up_read_non_owner(struct rw_ # define up_read_non_owner(sem) up_read(sem) #endif +#endif /* !PREEMPT_RT_FULL */ + #endif /* _LINUX_RWSEM_H */ Index: linux-3.18.13-rt10-r7s4/include/linux/rwsem_rt.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/rwsem_rt.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#ifndef _LINUX_RWSEM_RT_H +#define _LINUX_RWSEM_RT_H + +#ifndef _LINUX_RWSEM_H +#error "Include rwsem.h" +#endif + +/* + * RW-semaphores are a spinlock plus a reader-depth count. + * + * Note that the semantics are different from the usual + * Linux rw-sems, in PREEMPT_RT mode we do not allow + * multiple readers to hold the lock at once, we only allow + * a read-lock owner to read-lock recursively. This is + * better for latency, makes the implementation inherently + * fair and makes it simpler as well. + */ + +#include <linux/rtmutex.h> + +struct rw_semaphore { + struct rt_mutex lock; + int read_depth; +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +}; + +#define __RWSEM_INITIALIZER(name) \ + { .lock = __RT_MUTEX_INITIALIZER(name.lock), \ + RW_DEP_MAP_INIT(name) } + +#define DECLARE_RWSEM(lockname) \ + struct rw_semaphore lockname = __RWSEM_INITIALIZER(lockname) + +extern void __rt_rwsem_init(struct rw_semaphore *rwsem, const char *name, + struct lock_class_key *key); + +#define __rt_init_rwsem(sem, name, key) \ + do { \ + rt_mutex_init(&(sem)->lock); \ + __rt_rwsem_init((sem), (name), (key));\ + } while (0) + +#define __init_rwsem(sem, name, key) __rt_init_rwsem(sem, name, key) + +# define rt_init_rwsem(sem) \ +do { \ + static struct lock_class_key __key; \ + \ + __rt_init_rwsem((sem), #sem, &__key); \ +} while (0) + +extern void rt_down_write(struct rw_semaphore *rwsem); +extern void rt_down_read_nested(struct rw_semaphore *rwsem, int subclass); +extern void rt_down_write_nested(struct rw_semaphore *rwsem, int subclass); +extern void rt_down_write_nested_lock(struct rw_semaphore *rwsem, + struct lockdep_map *nest); +extern void rt_down_read(struct rw_semaphore *rwsem); +extern int rt_down_write_trylock(struct rw_semaphore *rwsem); +extern int rt_down_read_trylock(struct rw_semaphore *rwsem); +extern void rt_up_read(struct rw_semaphore *rwsem); +extern void rt_up_write(struct rw_semaphore *rwsem); +extern void rt_downgrade_write(struct rw_semaphore *rwsem); + +#define init_rwsem(sem) rt_init_rwsem(sem) +#define rwsem_is_locked(s) rt_mutex_is_locked(&(s)->lock) + +static inline int rwsem_is_contended(struct rw_semaphore *sem) +{ + /* rt_mutex_has_waiters() */ + return !RB_EMPTY_ROOT(&sem->lock.waiters); +} + +static inline void down_read(struct rw_semaphore *sem) +{ + rt_down_read(sem); +} + +static inline int down_read_trylock(struct rw_semaphore *sem) +{ + return rt_down_read_trylock(sem); +} + +static inline void down_write(struct rw_semaphore *sem) +{ + rt_down_write(sem); +} + +static inline int down_write_trylock(struct rw_semaphore *sem) +{ + return rt_down_write_trylock(sem); +} + +static inline void up_read(struct rw_semaphore *sem) +{ + rt_up_read(sem); +} + +static inline void up_write(struct rw_semaphore *sem) +{ + rt_up_write(sem); +} + +static inline void downgrade_write(struct rw_semaphore *sem) +{ + rt_downgrade_write(sem); +} + +static inline void down_read_nested(struct rw_semaphore *sem, int subclass) +{ + return rt_down_read_nested(sem, subclass); +} + +static inline void down_write_nested(struct rw_semaphore *sem, int subclass) +{ + rt_down_write_nested(sem, subclass); +} +#ifdef CONFIG_DEBUG_LOCK_ALLOC +static inline void down_write_nest_lock(struct rw_semaphore *sem, + struct rw_semaphore *nest_lock) +{ + rt_down_write_nested_lock(sem, &nest_lock->dep_map); +} + +#else + +static inline void down_write_nest_lock(struct rw_semaphore *sem, + struct rw_semaphore *nest_lock) +{ + rt_down_write_nested_lock(sem, NULL); +} +#endif +#endif Index: linux-3.18.13-rt10-r7s4/include/linux/sched.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/sched.h +++ linux-3.18.13-rt10-r7s4/include/linux/sched.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:29 @ struct sched_param { #include <linux/nodemask.h> #include <linux/mm_types.h> #include <linux/preempt_mask.h> +#include <asm/kmap_types.h> #include <asm/page.h> #include <asm/ptrace.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:60 @ struct sched_param { #include <linux/cred.h> #include <linux/llist.h> #include <linux/uidgid.h> +#include <linux/hardirq.h> #include <linux/gfp.h> #include <linux/magic.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:240 @ extern char ___assert_task_state[1 - 2*! TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD) -#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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1236 @ enum perf_event_task_context { struct task_struct { volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ + volatile long saved_state; /* saved state for "spinlock sleepers" */ void *stack; atomic_t usage; unsigned int flags; /* per process flags, defined below */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1273 @ struct task_struct { #endif unsigned int policy; +#ifdef CONFIG_PREEMPT_RT_FULL + int migrate_disable; +# ifdef CONFIG_SCHED_DEBUG + int migrate_disable_atomic; +# endif +#endif int nr_cpus_allowed; cpumask_t cpus_allowed; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1380 @ struct task_struct { struct cputime prev_cputime; #endif #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN - seqlock_t vtime_seqlock; + raw_spinlock_t vtime_lock; + seqcount_t vtime_seq; unsigned long long vtime_snap; enum { VTIME_SLEEPING = 0, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1397 @ struct task_struct { struct task_cputime cputime_expires; struct list_head cpu_timers[3]; +#ifdef CONFIG_PREEMPT_RT_BASE + struct task_struct *posix_timer_list; +#endif /* process credentials */ const struct cred __rcu *real_cred; /* objective and real subjective task @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1432 @ struct task_struct { /* signal handlers */ struct signal_struct *signal; struct sighand_struct *sighand; + struct sigqueue *sigqueue_cache; sigset_t blocked, real_blocked; sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1478 @ struct task_struct { /* mutex deadlock detection */ struct mutex_waiter *blocked_on; #endif +#ifdef CONFIG_PREEMPT_RT_FULL + int pagefault_disabled; +#endif #ifdef CONFIG_TRACE_IRQFLAGS unsigned int irq_events; unsigned long hardirq_enable_ip; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1665 @ struct task_struct { unsigned long trace; /* bitmask and counter of trace recursion */ unsigned long trace_recursion; +#ifdef CONFIG_WAKEUP_LATENCY_HIST + u64 preempt_timestamp_hist; +#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST + long timer_offset; +#endif +#endif #endif /* CONFIG_TRACING */ #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */ unsigned int memcg_kmem_skip_account; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1688 @ 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 }; -/* Future-safe accessor for struct task_struct's cpus_allowed. */ -#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) - #define TNF_MIGRATED 0x01 #define TNF_NO_GROUP 0x02 #define TNF_SHARED 0x04 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1735 @ static inline bool should_numa_migrate_m } #endif +#ifdef CONFIG_PREEMPT_RT_FULL +static inline bool cur_pf_disabled(void) { return current->pagefault_disabled; } +#else +static inline bool cur_pf_disabled(void) { return false; } +#endif + +static inline bool pagefault_disabled(void) +{ + return in_atomic() || cur_pf_disabled(); +} + static inline struct pid *task_pid(struct task_struct *task) { return task->pids[PIDTYPE_PID].pid; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1899 @ extern struct pid *cad_pid; extern void free_task(struct task_struct *tsk); #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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1915 @ static inline void put_task_struct(struc if (atomic_dec_and_test(&t->usage)) __put_task_struct(t); } +#endif #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN extern void task_cputime(struct task_struct *t, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1954 @ extern void thread_group_cputime_adjuste /* * Per process flags */ +#define PF_IN_SOFTIRQ 0x00000001 /* Task is serving softirq */ #define PF_EXITING 0x00000004 /* getting shut down */ #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2115 @ extern void do_set_cpus_allowed(struct t extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask); +int migrate_me(void); +void tell_sched_cpu_down_begin(int cpu); +void tell_sched_cpu_down_done(int cpu); + #else static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2131 @ static inline int set_cpus_allowed_ptr(s return -EINVAL; return 0; } +static inline int migrate_me(void) { return 0; } +static inline void tell_sched_cpu_down_begin(int cpu) { } +static inline void tell_sched_cpu_down_done(int cpu) { } #endif #ifdef CONFIG_NO_HZ_COMMON @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2354 @ extern void xtime_update(unsigned long t 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 extern void kick_process(struct task_struct *tsk); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2471 @ extern struct mm_struct * mm_alloc(void) /* mmdrop drops the mm and the page tables */ extern void __mmdrop(struct mm_struct *); + static inline void mmdrop(struct mm_struct * mm) { if (unlikely(atomic_dec_and_test(&mm->mm_count))) __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 + /* mmput gets rid of the mappings and all user-space */ extern void mmput(struct mm_struct *); /* Grab a reference to a task's mm, if it is not already going away */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2796 @ 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 int restart_syscall(void) { set_tsk_thread_flag(current, TIF_SIGPENDING); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2864 @ static inline int signal_pending_state(l return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); } +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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2925 @ extern int _cond_resched(void); extern int __cond_resched_lock(spinlock_t *lock); -#ifdef CONFIG_PREEMPT_COUNT +#if defined(CONFIG_PREEMPT_COUNT) && !defined(CONFIG_PREEMPT_RT_FULL) #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET #else #define PREEMPT_LOCK_OFFSET 0 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2936 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3112 @ static inline void set_task_cpu(struct t #endif /* CONFIG_SMP */ +static inline int __migrate_disabled(struct task_struct *p) +{ +#ifdef CONFIG_PREEMPT_RT_FULL + return p->migrate_disable; +#else + return 0; +#endif +} + +/* Future-safe accessor for struct task_struct's cpus_allowed. */ +static inline const struct cpumask *tsk_cpus_allowed(struct task_struct *p) +{ +#ifdef CONFIG_PREEMPT_RT_FULL + if (p->migrate_disable) + return cpumask_of(task_cpu(p)); +#endif + + return &p->cpus_allowed; +} + extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); extern long sched_getaffinity(pid_t pid, struct cpumask *mask); Index: linux-3.18.13-rt10-r7s4/include/linux/seqlock.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/seqlock.h +++ linux-3.18.13-rt10-r7s4/include/linux/seqlock.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:222 @ 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_latch - redirect readers to even/odd copy * @s: pointer to seqcount_t @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:318 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:358 @ 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 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); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:396 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:406 @ 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-3.18.13-rt10-r7s4/include/linux/signal.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/signal.h +++ linux-3.18.13-rt10-r7s4/include/linux/signal.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:221 @ 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-3.18.13-rt10-r7s4/include/linux/skbuff.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/skbuff.h +++ linux-3.18.13-rt10-r7s4/include/linux/skbuff.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:175 @ struct sk_buff_head { __u32 qlen; spinlock_t lock; + raw_spinlock_t raw_lock; }; struct sk_buff; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1331 @ 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-3.18.13-rt10-r7s4/include/linux/smp.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/smp.h +++ linux-3.18.13-rt10-r7s4/include/linux/smp.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:181 @ static inline void wake_up_all_idle_cpus #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-3.18.13-rt10-r7s4/include/linux/spinlock.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/spinlock.h +++ linux-3.18.13-rt10-r7s4/include/linux/spinlock.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:281 @ static inline void do_raw_spin_unlock(ra #define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock)) /* Include rwlock functions */ -#include <linux/rwlock.h> +#ifdef CONFIG_PREEMPT_RT_FULL +# include <linux/rwlock_rt.h> +#else +# include <linux/rwlock.h> +#endif /* * Pull the _spin_*()/_read_*()/_write_*() functions/declarations: @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:296 @ static inline void do_raw_spin_unlock(ra # include <linux/spinlock_api_up.h> #endif +#ifdef CONFIG_PREEMPT_RT_FULL +# include <linux/spinlock_rt.h> +#else /* PREEMPT_RT_FULL */ + /* * Map the spin_lock functions to the raw variants for PREEMPT_RT=n */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:429 @ 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-3.18.13-rt10-r7s4/include/linux/spinlock_api_smp.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/spinlock_api_smp.h +++ linux-3.18.13-rt10-r7s4/include/linux/spinlock_api_smp.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:190 @ static inline int __raw_spin_trylock_bh( return 0; } -#include <linux/rwlock_api_smp.h> +#ifndef CONFIG_PREEMPT_RT_FULL +# include <linux/rwlock_api_smp.h> +#endif #endif /* __LINUX_SPINLOCK_API_SMP_H */ Index: linux-3.18.13-rt10-r7s4/include/linux/spinlock_rt.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/spinlock_rt.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#ifndef __LINUX_SPINLOCK_RT_H +#define __LINUX_SPINLOCK_RT_H + +#ifndef __LINUX_SPINLOCK_H +#error Do not include directly. Use spinlock.h +#endif + +#include <linux/bug.h> + +extern void +__rt_spin_lock_init(spinlock_t *lock, 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_after_trylock_in_irq(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. + */ +extern void __lockfunc __rt_spin_lock(struct rt_mutex *lock); +extern void __lockfunc __rt_spin_unlock(struct rt_mutex *lock); +extern int __lockfunc __rt_spin_trylock(struct rt_mutex *lock); + +#define spin_lock(lock) \ + do { \ + migrate_disable(); \ + rt_spin_lock(lock); \ + } while (0) + +#define spin_lock_bh(lock) \ + do { \ + local_bh_disable(); \ + migrate_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; \ + migrate_disable(); \ + __locked = spin_do_trylock(lock); \ + if (!__locked) \ + migrate_enable(); \ + __locked; \ +}) + +#ifdef CONFIG_LOCKDEP +# define spin_lock_nested(lock, subclass) \ + do { \ + migrate_disable(); \ + rt_spin_lock_nested(lock, subclass); \ + } while (0) + +# define spin_lock_irqsave_nested(lock, flags, subclass) \ + do { \ + typecheck(unsigned long, flags); \ + flags = 0; \ + migrate_disable(); \ + rt_spin_lock_nested(lock, subclass); \ + } while (0) +#else +# define spin_lock_nested(lock, subclass) spin_lock(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) \ + do { \ + rt_spin_unlock(lock); \ + migrate_enable(); \ + } while (0) + +#define spin_unlock_bh(lock) \ + do { \ + rt_spin_unlock(lock); \ + migrate_enable(); \ + 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-3.18.13-rt10-r7s4/include/linux/spinlock_types.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/spinlock_types.h +++ linux-3.18.13-rt10-r7s4/include/linux/spinlock_types.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:12 @ * Released under the General Public License (GPL). */ -#if defined(CONFIG_SMP) -# include <asm/spinlock_types.h> -#else -# include <linux/spinlock_types_up.h> -#endif - -#include <linux/lockdep.h> - -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 <linux/spinlock_types_raw.h> -#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 <linux/spinlock_types_nort.h> +# include <linux/rwlock_types.h> #else -# define SPIN_DEBUG_INIT(lockname) +# include <linux/rtmutex.h> +# include <linux/spinlock_types_rt.h> +# include <linux/rwlock_types_rt.h> #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 <linux/rwlock_types.h> - #endif /* __LINUX_SPINLOCK_TYPES_H */ Index: linux-3.18.13-rt10-r7s4/include/linux/spinlock_types_nort.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/spinlock_types_nort.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#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-3.18.13-rt10-r7s4/include/linux/spinlock_types_raw.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/spinlock_types_raw.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#ifndef __LINUX_SPINLOCK_TYPES_RAW_H +#define __LINUX_SPINLOCK_TYPES_RAW_H + +#if defined(CONFIG_SMP) +# include <asm/spinlock_types.h> +#else +# include <linux/spinlock_types_up.h> +#endif + +#include <linux/lockdep.h> + +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-3.18.13-rt10-r7s4/include/linux/spinlock_types_rt.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/spinlock_types_rt.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#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 <linux/cache.h> + +/* + * 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) + +#define DEFINE_SPINLOCK(name) \ + spinlock_t name __cacheline_aligned_in_smp = __SPIN_LOCK_UNLOCKED(name) + +#endif Index: linux-3.18.13-rt10-r7s4/include/linux/srcu.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/srcu.h +++ linux-3.18.13-rt10-r7s4/include/linux/srcu.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:87 @ int init_srcu_struct(struct srcu_struct void process_srcu(struct work_struct *work); -#define __SRCU_STRUCT_INIT(name) \ +#define __SRCU_STRUCT_INIT(name, pcpu_name) \ { \ .completed = -300, \ - .per_cpu_ref = &name##_srcu_array, \ + .per_cpu_ref = &pcpu_name, \ .queue_lock = __SPIN_LOCK_UNLOCKED(name.queue_lock), \ .running = false, \ .batch_queue = RCU_BATCH_INIT(name.batch_queue), \ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:107 @ void process_srcu(struct work_struct *wo */ #define DEFINE_SRCU(name) \ static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\ - struct srcu_struct name = __SRCU_STRUCT_INIT(name); + struct srcu_struct name = __SRCU_STRUCT_INIT(name, name##_srcu_array); #define DEFINE_STATIC_SRCU(name) \ static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\ - static struct srcu_struct name = __SRCU_STRUCT_INIT(name); + static struct srcu_struct name = __SRCU_STRUCT_INIT(\ + name, name##_srcu_array); /** * call_srcu() - Queue a callback for invocation after an SRCU grace period Index: linux-3.18.13-rt10-r7s4/include/linux/swap.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/swap.h +++ linux-3.18.13-rt10-r7s4/include/linux/swap.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:14 @ #include <linux/fs.h> #include <linux/atomic.h> #include <linux/page-flags.h> +#include <linux/locallock.h> #include <asm/page.h> struct notifier_block; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:264 @ struct swap_info_struct { void *workingset_eviction(struct address_space *mapping, struct page *page); bool workingset_refault(void *shadow); void workingset_activation(struct page *page); -extern struct list_lru workingset_shadow_nodes; +extern struct list_lru __workingset_shadow_nodes; +DECLARE_LOCAL_IRQ_LOCK(workingset_shadow_lock); static inline unsigned int workingset_node_pages(struct radix_tree_node *node) { Index: linux-3.18.13-rt10-r7s4/include/linux/sysctl.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/sysctl.h +++ linux-3.18.13-rt10-r7s4/include/linux/sysctl.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:28 @ #include <linux/rcupdate.h> #include <linux/wait.h> #include <linux/rbtree.h> +#include <linux/atomic.h> #include <uapi/linux/sysctl.h> /* For the /proc/sys support */ Index: linux-3.18.13-rt10-r7s4/include/linux/thread_info.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/thread_info.h +++ linux-3.18.13-rt10-r7s4/include/linux/thread_info.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:105 @ 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 #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK /* Index: linux-3.18.13-rt10-r7s4/include/linux/timer.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/timer.h +++ linux-3.18.13-rt10-r7s4/include/linux/timer.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:244 @ 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-3.18.13-rt10-r7s4/include/linux/uaccess.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/uaccess.h +++ linux-3.18.13-rt10-r7s4/include/linux/uaccess.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:9 @ /* * These routines enable/disable the pagefault handler in that - * it will not take any locks and go straight to the fixup table. - * - * They have great resemblance to the preempt_disable/enable calls - * and in fact they are identical; this is because currently there is - * no other way to make the pagefault handlers do this. So we do - * disable preemption but we don't necessarily care about that. + * it will not take any MM locks and go straight to the fixup table. */ -static inline void pagefault_disable(void) +static inline void raw_pagefault_disable(void) { preempt_count_inc(); /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:21 @ static inline void pagefault_disable(voi barrier(); } -static inline void pagefault_enable(void) +static inline void raw_pagefault_enable(void) { #ifndef CONFIG_PREEMPT /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:35 @ static inline void pagefault_enable(void #endif } +#ifndef CONFIG_PREEMPT_RT_FULL +static inline void pagefault_disable(void) +{ + raw_pagefault_disable(); +} + +static inline void pagefault_enable(void) +{ + raw_pagefault_enable(); +} +#else +extern void pagefault_disable(void); +extern void pagefault_enable(void); +#endif + #ifndef ARCH_HAS_NOCACHE_UACCESS static inline unsigned long __copy_from_user_inatomic_nocache(void *to, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:89 @ static inline unsigned long __copy_from_ mm_segment_t old_fs = get_fs(); \ \ set_fs(KERNEL_DS); \ - pagefault_disable(); \ + raw_pagefault_disable(); \ ret = __copy_from_user_inatomic(&(retval), (__force typeof(retval) __user *)(addr), sizeof(retval)); \ - pagefault_enable(); \ + raw_pagefault_enable(); \ set_fs(old_fs); \ ret; \ }) Index: linux-3.18.13-rt10-r7s4/include/linux/uprobes.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/uprobes.h +++ linux-3.18.13-rt10-r7s4/include/linux/uprobes.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:30 @ #include <linux/errno.h> #include <linux/rbtree.h> #include <linux/types.h> +#include <linux/wait.h> struct vm_area_struct; struct mm_struct; Index: linux-3.18.13-rt10-r7s4/include/linux/vmstat.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/vmstat.h +++ linux-3.18.13-rt10-r7s4/include/linux/vmstat.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:36 @ 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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:48 @ 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-3.18.13-rt10-r7s4/include/linux/wait-simple.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/wait-simple.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#ifndef _LINUX_WAIT_SIMPLE_H +#define _LINUX_WAIT_SIMPLE_H + +#include <linux/spinlock.h> +#include <linux/list.h> + +#include <asm/current.h> + +struct swaiter { + struct task_struct *task; + struct list_head node; +}; + +#define DEFINE_SWAITER(name) \ + struct swaiter name = { \ + .task = current, \ + .node = LIST_HEAD_INIT((name).node), \ + } + +struct swait_head { + raw_spinlock_t lock; + struct list_head list; +}; + +#define SWAIT_HEAD_INITIALIZER(name) { \ + .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \ + .list = LIST_HEAD_INIT((name).list), \ + } + +#define DEFINE_SWAIT_HEAD(name) \ + struct swait_head name = SWAIT_HEAD_INITIALIZER(name) + +extern void __init_swait_head(struct swait_head *h, struct lock_class_key *key); + +#define init_swait_head(swh) \ + do { \ + static struct lock_class_key __key; \ + \ + __init_swait_head((swh), &__key); \ + } while (0) + +/* + * Waiter functions + */ +extern void swait_prepare_locked(struct swait_head *head, struct swaiter *w); +extern void swait_prepare(struct swait_head *head, struct swaiter *w, int state); +extern void swait_finish_locked(struct swait_head *head, struct swaiter *w); +extern void swait_finish(struct swait_head *head, struct swaiter *w); + +/* Check whether a head has waiters enqueued */ +static inline bool swaitqueue_active(struct swait_head *h) +{ + /* Make sure the condition is visible before checking list_empty() */ + smp_mb(); + return !list_empty(&h->list); +} + +/* + * Wakeup functions + */ +extern unsigned int __swait_wake(struct swait_head *head, unsigned int state, unsigned int num); +extern unsigned int __swait_wake_locked(struct swait_head *head, unsigned int state, unsigned int num); + +#define swait_wake(head) __swait_wake(head, TASK_NORMAL, 1) +#define swait_wake_interruptible(head) __swait_wake(head, TASK_INTERRUPTIBLE, 1) +#define swait_wake_all(head) __swait_wake(head, TASK_NORMAL, 0) +#define swait_wake_all_interruptible(head) __swait_wake(head, TASK_INTERRUPTIBLE, 0) + +/* + * Event API + */ +#define __swait_event(wq, condition) \ +do { \ + DEFINE_SWAITER(__wait); \ + \ + for (;;) { \ + swait_prepare(&wq, &__wait, TASK_UNINTERRUPTIBLE); \ + if (condition) \ + break; \ + schedule(); \ + } \ + swait_finish(&wq, &__wait); \ +} while (0) + +/** + * swait_event - sleep until a condition gets true + * @wq: the waitqueue to wait on + * @condition: a C expression for the event to wait for + * + * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the + * @condition evaluates to true. The @condition is checked each time + * the waitqueue @wq is woken up. + * + * wake_up() has to be called after changing any variable that could + * change the result of the wait condition. + */ +#define swait_event(wq, condition) \ +do { \ + if (condition) \ + break; \ + __swait_event(wq, condition); \ +} while (0) + +#define __swait_event_interruptible(wq, condition, ret) \ +do { \ + DEFINE_SWAITER(__wait); \ + \ + for (;;) { \ + swait_prepare(&wq, &__wait, TASK_INTERRUPTIBLE); \ + if (condition) \ + break; \ + if (signal_pending(current)) { \ + ret = -ERESTARTSYS; \ + break; \ + } \ + schedule(); \ + } \ + swait_finish(&wq, &__wait); \ +} while (0) + +#define __swait_event_interruptible_timeout(wq, condition, ret) \ +do { \ + DEFINE_SWAITER(__wait); \ + \ + for (;;) { \ + swait_prepare(&wq, &__wait, TASK_INTERRUPTIBLE); \ + if (condition) \ + break; \ + if (signal_pending(current)) { \ + ret = -ERESTARTSYS; \ + break; \ + } \ + ret = schedule_timeout(ret); \ + if (!ret) \ + break; \ + } \ + swait_finish(&wq, &__wait); \ +} while (0) + +/** + * swait_event_interruptible - sleep until a condition gets true + * @wq: the waitqueue to wait on + * @condition: a C expression for the event to wait for + * + * The process is put to sleep (TASK_INTERRUPTIBLE) until the + * @condition evaluates to true. The @condition is checked each time + * the waitqueue @wq is woken up. + * + * wake_up() has to be called after changing any variable that could + * change the result of the wait condition. + */ +#define swait_event_interruptible(wq, condition) \ +({ \ + int __ret = 0; \ + if (!(condition)) \ + __swait_event_interruptible(wq, condition, __ret); \ + __ret; \ +}) + +#define swait_event_interruptible_timeout(wq, condition, timeout) \ +({ \ + int __ret = timeout; \ + if (!(condition)) \ + __swait_event_interruptible_timeout(wq, condition, __ret); \ + __ret; \ +}) + +#define __swait_event_timeout(wq, condition, ret) \ +do { \ + DEFINE_SWAITER(__wait); \ + \ + for (;;) { \ + swait_prepare(&wq, &__wait, TASK_UNINTERRUPTIBLE); \ + if (condition) \ + break; \ + ret = schedule_timeout(ret); \ + if (!ret) \ + break; \ + } \ + swait_finish(&wq, &__wait); \ +} while (0) + +/** + * swait_event_timeout - sleep until a condition gets true or a timeout elapses + * @wq: the waitqueue to wait on + * @condition: a C expression for the event to wait for + * @timeout: timeout, in jiffies + * + * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the + * @condition evaluates to true. The @condition is checked each time + * the waitqueue @wq is woken up. + * + * wake_up() has to be called after changing any variable that could + * change the result of the wait condition. + * + * The function returns 0 if the @timeout elapsed, and the remaining + * jiffies if the condition evaluated to true before the timeout elapsed. + */ +#define swait_event_timeout(wq, condition, timeout) \ +({ \ + long __ret = timeout; \ + if (!(condition)) \ + __swait_event_timeout(wq, condition, __ret); \ + __ret; \ +}) + +#endif Index: linux-3.18.13-rt10-r7s4/include/linux/wait.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/linux/wait.h +++ linux-3.18.13-rt10-r7s4/include/linux/wait.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:11 @ #include <linux/spinlock.h> #include <asm/current.h> #include <uapi/linux/wait.h> +#include <linux/atomic.h> typedef struct __wait_queue wait_queue_t; typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, void *key); Index: linux-3.18.13-rt10-r7s4/include/linux/work-simple.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/linux/work-simple.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#ifndef _LINUX_SWORK_H +#define _LINUX_SWORK_H + +#include <linux/list.h> + +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-3.18.13-rt10-r7s4/include/net/dst.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/net/dst.h +++ linux-3.18.13-rt10-r7s4/include/net/dst.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:406 @ static inline void dst_confirm(struct ds static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n, struct sk_buff *skb) { - const struct hh_cache *hh; + struct hh_cache *hh; if (dst->pending_confirm) { unsigned long now = jiffies; Index: linux-3.18.13-rt10-r7s4/include/net/neighbour.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/net/neighbour.h +++ linux-3.18.13-rt10-r7s4/include/net/neighbour.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:390 @ 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; int hh_len; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:445 @ 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-3.18.13-rt10-r7s4/include/net/netns/ipv4.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/include/net/netns/ipv4.h +++ linux-3.18.13-rt10-r7s4/include/net/netns/ipv4.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:70 @ struct netns_ipv4 { int sysctl_icmp_echo_ignore_all; int sysctl_icmp_echo_ignore_broadcasts; + int sysctl_icmp_echo_sysrq; int sysctl_icmp_ignore_bogus_error_responses; int sysctl_icmp_ratelimit; int sysctl_icmp_ratemask; Index: linux-3.18.13-rt10-r7s4/include/trace/events/hist.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/trace/events/hist.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM hist + +#if !defined(_TRACE_HIST_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_HIST_H + +#include "latency_hist.h" +#include <linux/tracepoint.h> + +#if !defined(CONFIG_PREEMPT_OFF_HIST) && !defined(CONFIG_INTERRUPT_OFF_HIST) +#define trace_preemptirqsoff_hist(a, b) +#else +TRACE_EVENT(preemptirqsoff_hist, + + TP_PROTO(int reason, int starthist), + + TP_ARGS(reason, starthist), + + TP_STRUCT__entry( + __field(int, reason) + __field(int, starthist) + ), + + TP_fast_assign( + __entry->reason = reason; + __entry->starthist = starthist; + ), + + TP_printk("reason=%s starthist=%s", getaction(__entry->reason), + __entry->starthist ? "start" : "stop") +); +#endif + +#ifndef CONFIG_MISSED_TIMER_OFFSETS_HIST +#define trace_hrtimer_interrupt(a, b, c, d) +#else +TRACE_EVENT(hrtimer_interrupt, + + TP_PROTO(int cpu, long long offset, struct task_struct *curr, + struct task_struct *task), + + TP_ARGS(cpu, offset, curr, task), + + TP_STRUCT__entry( + __field(int, cpu) + __field(long long, offset) + __array(char, ccomm, TASK_COMM_LEN) + __field(int, cprio) + __array(char, tcomm, TASK_COMM_LEN) + __field(int, tprio) + ), + + TP_fast_assign( + __entry->cpu = cpu; + __entry->offset = offset; + memcpy(__entry->ccomm, curr->comm, TASK_COMM_LEN); + __entry->cprio = curr->prio; + memcpy(__entry->tcomm, task != NULL ? task->comm : "<none>", + task != NULL ? TASK_COMM_LEN : 7); + __entry->tprio = task != NULL ? task->prio : -1; + ), + + TP_printk("cpu=%d offset=%lld curr=%s[%d] thread=%s[%d]", + __entry->cpu, __entry->offset, __entry->ccomm, + __entry->cprio, __entry->tcomm, __entry->tprio) +); +#endif + +#endif /* _TRACE_HIST_H */ + +/* This part must be outside protection */ +#include <trace/define_trace.h> Index: linux-3.18.13-rt10-r7s4/include/trace/events/latency_hist.h =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/include/trace/events/latency_hist.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +#ifndef _LATENCY_HIST_H +#define _LATENCY_HIST_H + +enum hist_action { + IRQS_ON, + PREEMPT_ON, + TRACE_STOP, + IRQS_OFF, + PREEMPT_OFF, + TRACE_START, +}; + +static char *actions[] = { + "IRQS_ON", + "PREEMPT_ON", + "TRACE_STOP", + "IRQS_OFF", + "PREEMPT_OFF", + "TRACE_START", +}; + +static inline char *getaction(int action) +{ + if (action >= 0 && action <= sizeof(actions)/sizeof(actions[0])) + return actions[action]; + return "unknown"; +} + +#endif /* _LATENCY_HIST_H */ Index: linux-3.18.13-rt10-r7s4/init/Kconfig =================================================================== --- linux-3.18.13-rt10-r7s4.orig/init/Kconfig +++ linux-3.18.13-rt10-r7s4/init/Kconfig @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:638 @ config RCU_FANOUT_EXACT config RCU_FAST_NO_HZ bool "Accelerate last non-dyntick-idle CPU's grace periods" - depends on NO_HZ_COMMON && SMP + depends on NO_HZ_COMMON && SMP && !PREEMPT_RT_FULL default n help This option permits CPUs to enter dynticks-idle state even if @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:665 @ config TREE_RCU_TRACE config RCU_BOOST bool "Enable RCU priority boosting" depends on RT_MUTEXES && PREEMPT_RCU - 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. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1109 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1681 @ choice config SLAB bool "SLAB" + depends on !PREEMPT_RT_FULL help The regular slab allocator that is established and known to work well in all environments. It organizes cache hot objects in @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1700 @ 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 Index: linux-3.18.13-rt10-r7s4/init/Makefile =================================================================== --- linux-3.18.13-rt10-r7s4.orig/init/Makefile +++ linux-3.18.13-rt10-r7s4/init/Makefile @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:36 @ 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-3.18.13-rt10-r7s4/init/main.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/init/main.c +++ linux-3.18.13-rt10-r7s4/init/main.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:536 @ asmlinkage __visible void __init start_k setup_command_line(command_line); setup_nr_cpu_ids(); setup_per_cpu_areas(); + softirq_early_init(); smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */ build_all_zonelists(NULL, NULL); Index: linux-3.18.13-rt10-r7s4/ipc/mqueue.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/ipc/mqueue.c +++ linux-3.18.13-rt10-r7s4/ipc/mqueue.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:926 @ static inline void pipelined_send(struct struct msg_msg *message, struct ext_wait_queue *receiver) { + /* + * Keep them in one critical section for PREEMPT_RT: + */ + preempt_disable_rt(); receiver->msg = message; list_del(&receiver->list); receiver->state = STATE_PENDING; wake_up_process(receiver->task); smp_wmb(); receiver->state = STATE_READY; + preempt_enable_rt(); } /* pipelined_receive() - if there is task waiting in sys_mq_timedsend() @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:950 @ static inline void pipelined_receive(str wake_up_interruptible(&info->wait_q); return; } - if (msg_insert(sender->msg, info)) - return; - list_del(&sender->list); - sender->state = STATE_PENDING; - wake_up_process(sender->task); - smp_wmb(); - sender->state = STATE_READY; + /* + * Keep them in one critical section for PREEMPT_RT: + */ + preempt_disable_rt(); + if (!msg_insert(sender->msg, info)) { + list_del(&sender->list); + sender->state = STATE_PENDING; + wake_up_process(sender->task); + smp_wmb(); + sender->state = STATE_READY; + } + preempt_enable_rt(); } SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, Index: linux-3.18.13-rt10-r7s4/ipc/msg.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/ipc/msg.c +++ linux-3.18.13-rt10-r7s4/ipc/msg.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:191 @ static void expunge_all(struct msg_queue struct msg_receiver *msr, *t; list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) { + /* + * Make sure that the wakeup doesnt preempt + * this CPU prematurely. (on PREEMPT_RT) + */ + preempt_disable_rt(); + msr->r_msg = NULL; /* initialize expunge ordering */ wake_up_process(msr->r_tsk); /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:207 @ static void expunge_all(struct msg_queue */ smp_mb(); msr->r_msg = ERR_PTR(res); + + preempt_enable_rt(); } } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:585 @ static inline int pipelined_send(struct if (testmsg(msg, msr->r_msgtype, msr->r_mode) && !security_msg_queue_msgrcv(msq, msg, msr->r_tsk, msr->r_msgtype, msr->r_mode)) { + /* + * Make sure that the wakeup doesnt preempt + * this CPU prematurely. (on PREEMPT_RT) + */ + preempt_disable_rt(); list_del(&msr->r_list); if (msr->r_maxsize < msg->m_ts) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:611 @ static inline int pipelined_send(struct */ smp_mb(); msr->r_msg = msg; + preempt_enable_rt(); return 1; } + preempt_enable_rt(); } } - return 0; } Index: linux-3.18.13-rt10-r7s4/ipc/sem.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/ipc/sem.c +++ linux-3.18.13-rt10-r7s4/ipc/sem.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:676 @ undo: static void wake_up_sem_queue_prepare(struct list_head *pt, struct sem_queue *q, int error) { +#ifdef CONFIG_PREEMPT_RT_BASE + struct task_struct *p = q->sleeper; + get_task_struct(p); + q->status = error; + wake_up_process(p); + put_task_struct(p); +#else if (list_empty(pt)) { /* * Hold preempt off so that we don't get preempted and have the @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:694 @ static void wake_up_sem_queue_prepare(st q->pid = error; list_add_tail(&q->list, pt); +#endif } /** @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:708 @ static void wake_up_sem_queue_prepare(st */ static void wake_up_sem_queue_do(struct list_head *pt) { +#ifndef CONFIG_PREEMPT_RT_BASE struct sem_queue *q, *t; int did_something; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:721 @ static void wake_up_sem_queue_do(struct } if (did_something) preempt_enable(); +#endif } static void unlink_queue(struct sem_array *sma, struct sem_queue *q) Index: linux-3.18.13-rt10-r7s4/kernel/Kconfig.locks =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/Kconfig.locks +++ linux-3.18.13-rt10-r7s4/kernel/Kconfig.locks @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:228 @ config ARCH_SUPPORTS_ATOMIC_RMW config MUTEX_SPIN_ON_OWNER def_bool y - depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW + depends on SMP && !DEBUG_MUTEXES && 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 ARCH_USE_QUEUE_RWLOCK bool Index: linux-3.18.13-rt10-r7s4/kernel/Kconfig.preempt =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/Kconfig.preempt +++ linux-3.18.13-rt10-r7s4/kernel/Kconfig.preempt @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +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" @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:49 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:68 @ 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-3.18.13-rt10-r7s4/kernel/cgroup.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/cgroup.c +++ linux-3.18.13-rt10-r7s4/kernel/cgroup.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4358 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4398 @ 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, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:5000 @ 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()); /* * Used to destroy pidlists and separate to serve as flush domain. Index: linux-3.18.13-rt10-r7s4/kernel/cpu.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/cpu.c +++ linux-3.18.13-rt10-r7s4/kernel/cpu.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:89 @ static struct { #define cpuhp_lock_acquire() lock_map_acquire(&cpu_hotplug.dep_map) #define cpuhp_lock_release() lock_map_release(&cpu_hotplug.dep_map) +/** + * hotplug_pcp - per cpu hotplug descriptor + * @unplug: set when pin_current_cpu() needs to sync tasks + * @sync_tsk: the task that waits for tasks to finish pinned sections + * @refcount: counter of tasks in pinned sections + * @grab_lock: set when the tasks entering pinned sections should wait + * @synced: notifier for @sync_tsk to tell cpu_down it's finished + * @mutex: the mutex to make tasks wait (used when @grab_lock is true) + * @mutex_init: zero if the mutex hasn't been initialized yet. + * + * Although @unplug and @sync_tsk may point to the same task, the @unplug + * is used as a flag and still exists after @sync_tsk has exited and + * @sync_tsk set to NULL. + */ +struct hotplug_pcp { + struct task_struct *unplug; + struct task_struct *sync_tsk; + int refcount; + int grab_lock; + struct completion synced; + struct completion unplug_wait; +#ifdef CONFIG_PREEMPT_RT_FULL + /* + * Note, on PREEMPT_RT, the hotplug lock must save the state of + * the task, otherwise the mutex will cause the task to fail + * to sleep when required. (Because it's called from migrate_disable()) + * + * The spinlock_t on PREEMPT_RT is a mutex that saves the task's + * state. + */ + spinlock_t lock; +#else + struct mutex mutex; +#endif + int mutex_init; +}; + +#ifdef CONFIG_PREEMPT_RT_FULL +# define hotplug_lock(hp) rt_spin_lock(&(hp)->lock) +# define hotplug_unlock(hp) rt_spin_unlock(&(hp)->lock) +#else +# define hotplug_lock(hp) mutex_lock(&(hp)->mutex) +# define hotplug_unlock(hp) mutex_unlock(&(hp)->mutex) +#endif + +static DEFINE_PER_CPU(struct hotplug_pcp, hotplug_pcp); + +/** + * pin_current_cpu - Prevent the current cpu from being unplugged + * + * Lightweight version of get_online_cpus() to prevent cpu from being + * unplugged when code runs in a migration disabled region. + * + * Must be called with preemption disabled (preempt_count = 1)! + */ +void pin_current_cpu(void) +{ + struct hotplug_pcp *hp; + int force = 0; + +retry: + hp = &__get_cpu_var(hotplug_pcp); + + if (!hp->unplug || hp->refcount || force || preempt_count() > 1 || + hp->unplug == current) { + hp->refcount++; + return; + } + if (hp->grab_lock) { + preempt_enable(); + hotplug_lock(hp); + hotplug_unlock(hp); + } else { + preempt_enable(); + /* + * Try to push this task off of this CPU. + */ + if (!migrate_me()) { + preempt_disable(); + hp = &__get_cpu_var(hotplug_pcp); + if (!hp->grab_lock) { + /* + * Just let it continue it's already pinned + * or about to sleep. + */ + force = 1; + goto retry; + } + preempt_enable(); + } + } + preempt_disable(); + goto retry; +} + +/** + * unpin_current_cpu - Allow unplug of current cpu + * + * Must be called with preemption or interrupts disabled! + */ +void unpin_current_cpu(void) +{ + struct hotplug_pcp *hp = &__get_cpu_var(hotplug_pcp); + + WARN_ON(hp->refcount <= 0); + + /* This is safe. sync_unplug_thread is pinned to this cpu */ + if (!--hp->refcount && hp->unplug && hp->unplug != current) + wake_up_process(hp->unplug); +} + +static void wait_for_pinned_cpus(struct hotplug_pcp *hp) +{ + set_current_state(TASK_UNINTERRUPTIBLE); + while (hp->refcount) { + schedule_preempt_disabled(); + set_current_state(TASK_UNINTERRUPTIBLE); + } +} + +static int sync_unplug_thread(void *data) +{ + struct hotplug_pcp *hp = data; + + wait_for_completion(&hp->unplug_wait); + preempt_disable(); + hp->unplug = current; + wait_for_pinned_cpus(hp); + + /* + * This thread will synchronize the cpu_down() with threads + * that have pinned the CPU. When the pinned CPU count reaches + * zero, we inform the cpu_down code to continue to the next step. + */ + set_current_state(TASK_UNINTERRUPTIBLE); + preempt_enable(); + complete(&hp->synced); + + /* + * If all succeeds, the next step will need tasks to wait till + * the CPU is offline before continuing. To do this, the grab_lock + * is set and tasks going into pin_current_cpu() will block on the + * mutex. But we still need to wait for those that are already in + * pinned CPU sections. If the cpu_down() failed, the kthread_should_stop() + * will kick this thread out. + */ + while (!hp->grab_lock && !kthread_should_stop()) { + schedule(); + set_current_state(TASK_UNINTERRUPTIBLE); + } + + /* Make sure grab_lock is seen before we see a stale completion */ + smp_mb(); + + /* + * Now just before cpu_down() enters stop machine, we need to make + * sure all tasks that are in pinned CPU sections are out, and new + * tasks will now grab the lock, keeping them from entering pinned + * CPU sections. + */ + if (!kthread_should_stop()) { + preempt_disable(); + wait_for_pinned_cpus(hp); + preempt_enable(); + complete(&hp->synced); + } + + set_current_state(TASK_UNINTERRUPTIBLE); + while (!kthread_should_stop()) { + schedule(); + set_current_state(TASK_UNINTERRUPTIBLE); + } + set_current_state(TASK_RUNNING); + + /* + * Force this thread off this CPU as it's going down and + * we don't want any more work on this CPU. + */ + current->flags &= ~PF_NO_SETAFFINITY; + set_cpus_allowed_ptr(current, cpu_present_mask); + migrate_me(); + return 0; +} + +static void __cpu_unplug_sync(struct hotplug_pcp *hp) +{ + wake_up_process(hp->sync_tsk); + wait_for_completion(&hp->synced); +} + +static void __cpu_unplug_wait(unsigned int cpu) +{ + struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu); + + complete(&hp->unplug_wait); + wait_for_completion(&hp->synced); +} + +/* + * Start the sync_unplug_thread on the target cpu and wait for it to + * complete. + */ +static int cpu_unplug_begin(unsigned int cpu) +{ + struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu); + int err; + + /* Protected by cpu_hotplug.lock */ + if (!hp->mutex_init) { +#ifdef CONFIG_PREEMPT_RT_FULL + spin_lock_init(&hp->lock); +#else + mutex_init(&hp->mutex); +#endif + hp->mutex_init = 1; + } + + /* Inform the scheduler to migrate tasks off this CPU */ + tell_sched_cpu_down_begin(cpu); + + init_completion(&hp->synced); + init_completion(&hp->unplug_wait); + + hp->sync_tsk = kthread_create(sync_unplug_thread, hp, "sync_unplug/%d", cpu); + if (IS_ERR(hp->sync_tsk)) { + err = PTR_ERR(hp->sync_tsk); + hp->sync_tsk = NULL; + return err; + } + kthread_bind(hp->sync_tsk, cpu); + + /* + * Wait for tasks to get out of the pinned sections, + * it's still OK if new tasks enter. Some CPU notifiers will + * wait for tasks that are going to enter these sections and + * we must not have them block. + */ + wake_up_process(hp->sync_tsk); + return 0; +} + +static void cpu_unplug_sync(unsigned int cpu) +{ + struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu); + + init_completion(&hp->synced); + /* The completion needs to be initialzied before setting grab_lock */ + smp_wmb(); + + /* Grab the mutex before setting grab_lock */ + hotplug_lock(hp); + hp->grab_lock = 1; + + /* + * The CPU notifiers have been completed. + * Wait for tasks to get out of pinned CPU sections and have new + * tasks block until the CPU is completely down. + */ + __cpu_unplug_sync(hp); + + /* All done with the sync thread */ + kthread_stop(hp->sync_tsk); + hp->sync_tsk = NULL; +} + +static void cpu_unplug_done(unsigned int cpu) +{ + struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu); + + hp->unplug = NULL; + /* Let all tasks know cpu unplug is finished before cleaning up */ + smp_wmb(); + + if (hp->sync_tsk) + kthread_stop(hp->sync_tsk); + + if (hp->grab_lock) { + hotplug_unlock(hp); + /* protected by cpu_hotplug.lock */ + hp->grab_lock = 0; + } + tell_sched_cpu_down_done(cpu); +} + void get_online_cpus(void) { might_sleep(); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:389 @ bool try_get_online_cpus(void) { if (cpu_hotplug.active_writer == current) return true; + if (!mutex_trylock(&cpu_hotplug.lock)) return false; cpuhp_lock_acquire_tryread(); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:637 @ static int __ref take_cpu_down(void *_pa /* Requires cpu_add_remove_lock to be held */ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) { - int err, nr_calls = 0; + int mycpu, err, nr_calls = 0; void *hcpu = (void *)(long)cpu; unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0; struct take_cpu_down_param tcd_param = { .mod = mod, .hcpu = hcpu, }; + cpumask_var_t cpumask; + cpumask_var_t cpumask_org; if (num_online_cpus() == 1) return -EBUSY; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:653 @ static int __ref _cpu_down(unsigned int if (!cpu_online(cpu)) return -EINVAL; + /* Move the downtaker off the unplug cpu */ + if (!alloc_cpumask_var(&cpumask, GFP_KERNEL)) + return -ENOMEM; + if (!alloc_cpumask_var(&cpumask_org, GFP_KERNEL)) { + free_cpumask_var(cpumask); + return -ENOMEM; + } + + cpumask_copy(cpumask_org, tsk_cpus_allowed(current)); + cpumask_andnot(cpumask, cpu_online_mask, cpumask_of(cpu)); + set_cpus_allowed_ptr(current, cpumask); + free_cpumask_var(cpumask); + migrate_disable(); + mycpu = smp_processor_id(); + if (mycpu == cpu) { + printk(KERN_ERR "Yuck! Still on unplug CPU\n!"); + migrate_enable(); + err = -EBUSY; + goto restore_cpus; + } + migrate_enable(); + cpu_hotplug_begin(); + err = cpu_unplug_begin(cpu); + if (err) { + printk("cpu_unplug_begin(%d) failed\n", cpu); + goto out_cancel; + } err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls); if (err) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:706 @ static int __ref _cpu_down(unsigned int #endif synchronize_rcu(); + __cpu_unplug_wait(cpu); smpboot_park_threads(cpu); + /* Notifiers are done. Don't let any more tasks pin this CPU. */ + cpu_unplug_sync(cpu); + /* * So now all preempt/rcu users must observe !cpu_active(). */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:744 @ static int __ref _cpu_down(unsigned int check_for_tasks(cpu); out_release: + cpu_unplug_done(cpu); +out_cancel: cpu_hotplug_done(); if (!err) cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu); +restore_cpus: + set_cpus_allowed_ptr(current, cpumask_org); + free_cpumask_var(cpumask_org); return err; } Index: linux-3.18.13-rt10-r7s4/kernel/debug/kdb/kdb_io.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/debug/kdb/kdb_io.c +++ linux-3.18.13-rt10-r7s4/kernel/debug/kdb/kdb_io.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:557 @ int vkdb_printf(const char *fmt, va_list int linecount; int colcount; int logging, saved_loglevel = 0; - int saved_trap_printk; int got_printf_lock = 0; int retlen = 0; int fnd, len; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:567 @ int vkdb_printf(const char *fmt, va_list unsigned long uninitialized_var(flags); preempt_disable(); - saved_trap_printk = kdb_trap_printk; - kdb_trap_printk = 0; /* Serialize kdb_printf if multiple cpus try to write at once. * But if any cpu goes recursive in kdb, just print the output, @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:833 @ kdb_print_out: } else { __release(kdb_printf_lock); } - kdb_trap_printk = saved_trap_printk; preempt_enable(); return retlen; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:842 @ int kdb_printf(const char *fmt, ...) va_list ap; int r; + kdb_trap_printk++; va_start(ap, fmt); r = vkdb_printf(fmt, ap); va_end(ap); + kdb_trap_printk--; return r; } Index: linux-3.18.13-rt10-r7s4/kernel/events/core.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/events/core.c +++ linux-3.18.13-rt10-r7s4/kernel/events/core.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:6349 @ static void perf_swevent_init_hrtimer(st hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); hwc->hrtimer.function = perf_swevent_hrtimer; + hwc->hrtimer.irqsafe = 1; /* * Since hrtimers have a fixed rate, we can do a static freq->period Index: linux-3.18.13-rt10-r7s4/kernel/exit.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/exit.c +++ linux-3.18.13-rt10-r7s4/kernel/exit.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:150 @ 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-3.18.13-rt10-r7s4/kernel/fork.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/fork.c +++ linux-3.18.13-rt10-r7s4/kernel/fork.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:100 @ int max_threads; /* tunable limit on nr DEFINE_PER_CPU(unsigned long, process_counts) = 0; -__cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */ +DEFINE_RWLOCK(tasklist_lock); /* outer */ #ifdef CONFIG_PROVE_RCU int lockdep_tasklist_lock_is_held(void) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:236 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:254 @ 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) { } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:659 @ 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 + /* * Decrement the use count and release all resources for an mm. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1186 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1316 @ static struct task_struct *copy_process( spin_lock_init(&p->alloc_lock); init_sigpending(&p->pending); + p->sigqueue_cache = NULL; p->utime = p->stime = p->gtime = 0; p->utimescaled = p->stimescaled = 0; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1324 @ static struct task_struct *copy_process( p->prev_cputime.utime = p->prev_cputime.stime = 0; #endif #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN - seqlock_init(&p->vtime_seqlock); + raw_spin_lock_init(&p->vtime_lock); + seqcount_init(&p->vtime_seq); p->vtime_snap = 0; p->vtime_snap_whence = VTIME_SLEEPING; #endif @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1376 @ static struct task_struct *copy_process( p->hardirq_context = 0; p->softirq_context = 0; #endif +#ifdef CONFIG_PREEMPT_RT_FULL + p->pagefault_disabled = 0; +#endif #ifdef CONFIG_LOCKDEP p->lockdep_depth = 0; /* no locks held yet */ p->curr_chain_key = 0; Index: linux-3.18.13-rt10-r7s4/kernel/futex.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/futex.c +++ linux-3.18.13-rt10-r7s4/kernel/futex.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:741 @ void exit_pi_state_list(struct task_stru * task still owns the PI-state: */ if (head->next != next) { + raw_spin_unlock_irq(&curr->pi_lock); spin_unlock(&hb->lock); + raw_spin_lock_irq(&curr->pi_lock); continue; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1710 @ 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; + free_pi_state(pi_state); + continue; } else if (ret) { /* -EDEADLK */ this->pi_state = NULL; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2564 @ static int futex_wait_requeue_pi(u32 __u struct hrtimer_sleeper timeout, *to = NULL; struct rt_mutex_waiter rt_waiter; struct rt_mutex *pi_mutex = NULL; - 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2589 @ 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. */ - debug_rt_mutex_init_waiter(&rt_waiter); - RB_CLEAR_NODE(&rt_waiter.pi_tree_entry); - RB_CLEAR_NODE(&rt_waiter.tree_entry); - rt_waiter.task = NULL; + rt_mutex_init_waiter(&rt_waiter, false); ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, VERIFY_WRITE); if (unlikely(ret != 0)) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2620 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2677 @ 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); - spin_unlock(q.lock_ptr); + spin_unlock(&hb2->lock); } } else { /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2693 @ static int futex_wait_requeue_pi(u32 __u ret = rt_mutex_finish_proxy_lock(pi_mutex, to, &rt_waiter); debug_rt_mutex_free_waiter(&rt_waiter); - spin_lock(q.lock_ptr); + spin_lock(&hb2->lock); + BUG_ON(&hb2->lock != q.lock_ptr); /* * Fixup the pi_state owner and possibly acquire the lock if we * haven't already. Index: linux-3.18.13-rt10-r7s4/kernel/irq/handle.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/irq/handle.c +++ linux-3.18.13-rt10-r7s4/kernel/irq/handle.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:136 @ void __irq_wake_thread(struct irq_desc * irqreturn_t handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action) { + struct pt_regs *regs = get_irq_regs(); + u64 ip = regs ? instruction_pointer(regs) : 0; irqreturn_t retval = IRQ_NONE; unsigned int flags = 0, irq = desc->irq_data.irq; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:178 @ handle_irq_event_percpu(struct irq_desc action = action->next; } while (action); - add_interrupt_randomness(irq, flags); +#ifndef CONFIG_PREEMPT_RT_FULL + add_interrupt_randomness(irq, flags, ip); +#else + desc->random_ip = ip; +#endif if (!noirqdebug) note_interrupt(irq, desc, retval); Index: linux-3.18.13-rt10-r7s4/kernel/irq/manage.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/irq/manage.c +++ linux-3.18.13-rt10-r7s4/kernel/irq/manage.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:25 @ #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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:34 @ static int __init setup_forced_irqthread return 0; } early_param("threadirqs", setup_forced_irqthreads); +# endif #endif static void __synchronize_hardirq(struct irq_desc *desc) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:178 @ static inline void irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { } #endif +#ifdef CONFIG_PREEMPT_RT_FULL +static void _irq_affinity_notify(struct irq_affinity_notify *notify); +static struct task_struct *set_affinity_helper; +static LIST_HEAD(affinity_list); +static DEFINE_RAW_SPINLOCK(affinity_list_lock); + +static int set_affinity_thread(void *unused) +{ + while (1) { + struct irq_affinity_notify *notify; + int empty; + + set_current_state(TASK_INTERRUPTIBLE); + + raw_spin_lock_irq(&affinity_list_lock); + empty = list_empty(&affinity_list); + raw_spin_unlock_irq(&affinity_list_lock); + + if (empty) + schedule(); + if (kthread_should_stop()) + break; + set_current_state(TASK_RUNNING); +try_next: + notify = NULL; + + raw_spin_lock_irq(&affinity_list_lock); + if (!list_empty(&affinity_list)) { + notify = list_first_entry(&affinity_list, + struct irq_affinity_notify, list); + list_del_init(¬ify->list); + } + raw_spin_unlock_irq(&affinity_list_lock); + + if (!notify) + continue; + _irq_affinity_notify(notify); + goto try_next; + } + return 0; +} + +static void init_helper_thread(void) +{ + if (set_affinity_helper) + return; + set_affinity_helper = kthread_run(set_affinity_thread, NULL, + "affinity-cb"); + WARN_ON(IS_ERR(set_affinity_helper)); +} +#else + +static inline void init_helper_thread(void) { } + +#endif + int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:272 @ int irq_set_affinity_locked(struct irq_d if (desc->affinity_notify) { kref_get(&desc->affinity_notify->kref); + +#ifdef CONFIG_PREEMPT_RT_FULL + raw_spin_lock(&affinity_list_lock); + if (list_empty(&desc->affinity_notify->list)) + list_add_tail(&affinity_list, + &desc->affinity_notify->list); + raw_spin_unlock(&affinity_list_lock); + wake_up_process(set_affinity_helper); +#else schedule_work(&desc->affinity_notify->work); +#endif } irqd_set(data, IRQD_AFFINITY_SET); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:317 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:340 @ out: kref_put(¬ify->kref, notify->release); } +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); +} + /** * irq_set_affinity_notifier - control notification of IRQ affinity changes * @irq: Interrupt for which to enable/disable notification @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:376 @ irq_set_affinity_notifier(unsigned int i notify->irq = irq; kref_init(¬ify->kref); INIT_WORK(¬ify->work, irq_affinity_notify); + INIT_LIST_HEAD(¬ify->list); + init_helper_thread(); } raw_spin_lock_irqsave(&desc->lock, flags); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:866 @ 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; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:957 @ static int irq_thread(void *data) if (action_ret == IRQ_HANDLED) atomic_inc(&desc->threads_handled); +#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); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1276 @ __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); + /* Set default affinity mask once everything is setup */ setup_affinity(irq, desc, mask); Index: linux-3.18.13-rt10-r7s4/kernel/irq/settings.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/irq/settings.h +++ linux-3.18.13-rt10-r7s4/kernel/irq/settings.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:18 @ enum { _IRQ_NESTED_THREAD = IRQ_NESTED_THREAD, _IRQ_PER_CPU_DEVID = IRQ_PER_CPU_DEVID, _IRQ_IS_POLLED = IRQ_IS_POLLED, + _IRQ_NO_SOFTIRQ_CALL = IRQ_NO_SOFTIRQ_CALL, _IRQF_MODIFY_MASK = IRQF_MODIFY_MASK, }; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:32 @ enum { #define IRQ_NESTED_THREAD GOT_YOU_MORON #define IRQ_PER_CPU_DEVID GOT_YOU_MORON #define IRQ_IS_POLLED GOT_YOU_MORON +#define IRQ_NO_SOFTIRQ_CALL GOT_YOU_MORON #undef IRQF_MODIFY_MASK #define IRQF_MODIFY_MASK GOT_YOU_MORON @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:43 @ 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-3.18.13-rt10-r7s4/kernel/irq/spurious.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/irq/spurious.c +++ linux-3.18.13-rt10-r7s4/kernel/irq/spurious.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:447 @ 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"); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:463 @ 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-3.18.13-rt10-r7s4/kernel/irq_work.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/irq_work.c +++ linux-3.18.13-rt10-r7s4/kernel/irq_work.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:20 @ #include <linux/cpu.h> #include <linux/notifier.h> #include <linux/smp.h> +#include <linux/interrupt.h> #include <asm/processor.h> @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:69 @ 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)); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:81 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:97 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:107 @ 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(); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:132 @ 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())); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:147 @ static void irq_work_run_list(struct lli struct irq_work *work; struct llist_node *llnode; - BUG_ON(!irqs_disabled()); + BUG_ON(!IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && !irqs_disabled()); if (llist_empty(list)) return; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:184 @ 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); void irq_work_tick(void) { - struct llist_head *raised = &__get_cpu_var(raised_list); + struct llist_head *raised = this_cpu_ptr(&raised_list); if (!llist_empty(raised) && !arch_irq_work_has_interrupt()) irq_work_run_list(raised); - irq_work_run_list(&__get_cpu_var(lazy_list)); + irq_work_run_list(this_cpu_ptr(&lazy_list)); } /* Index: linux-3.18.13-rt10-r7s4/kernel/ksysfs.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/ksysfs.c +++ linux-3.18.13-rt10-r7s4/kernel/ksysfs.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:139 @ KERNEL_ATTR_RO(vmcoreinfo); #endif /* CONFIG_KEXEC */ +#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) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:215 @ static struct attribute * kernel_attrs[] &vmcoreinfo_attr.attr, #endif &rcu_expedited_attr.attr, +#ifdef CONFIG_PREEMPT_RT_FULL + &realtime_attr.attr, +#endif NULL }; Index: linux-3.18.13-rt10-r7s4/kernel/locking/Makefile =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/locking/Makefile +++ linux-3.18.13-rt10-r7s4/kernel/locking/Makefile @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2 @ -obj-y += mutex.o semaphore.o rwsem.o mcs_spinlock.o +obj-y += semaphore.o mcs_spinlock.o ifdef CONFIG_FUNCTION_TRACER CFLAGS_REMOVE_lockdep.o = -pg @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:11 @ CFLAGS_REMOVE_mutex-debug.o = -pg CFLAGS_REMOVE_rtmutex-debug.o = -pg endif +ifneq ($(CONFIG_PREEMPT_RT_FULL),y) +obj-y += mutex.o obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o +obj-y += rwsem.o +endif obj-$(CONFIG_LOCKDEP) += lockdep.o ifeq ($(CONFIG_PROC_FS),y) obj-$(CONFIG_LOCKDEP) += lockdep_proc.o @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:28 @ obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmute obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.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_PERCPU_RWSEM) += percpu-rwsem.o +obj-$(CONFIG_PREEMPT_RT_FULL) += rt.o obj-$(CONFIG_QUEUE_RWLOCK) += qrwlock.o obj-$(CONFIG_LOCK_TORTURE_TEST) += locktorture.o Index: linux-3.18.13-rt10-r7s4/kernel/locking/lglock.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/locking/lglock.c +++ linux-3.18.13-rt10-r7s4/kernel/locking/lglock.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:7 @ #include <linux/cpu.h> #include <linux/string.h> +#ifndef CONFIG_PREEMPT_RT_FULL +# define lg_lock_ptr arch_spinlock_t +# define lg_do_lock(l) arch_spin_lock(l) +# define lg_do_unlock(l) arch_spin_unlock(l) +#else +# define lg_lock_ptr struct rt_mutex +# define lg_do_lock(l) __rt_spin_lock(l) +# define lg_do_unlock(l) __rt_spin_unlock(l) +#endif /* * Note there is no uninit, so lglocks cannot be defined in * modules (but it's fine to use them from there) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:24 @ void lg_lock_init(struct lglock *lg, char *name) { +#ifdef CONFIG_PREEMPT_RT_FULL + int i; + + for_each_possible_cpu(i) { + struct rt_mutex *lock = per_cpu_ptr(lg->lock, i); + + rt_mutex_init(lock); + } +#endif LOCKDEP_INIT_MAP(&lg->lock_dep_map, name, &lg->lock_key, 0); } EXPORT_SYMBOL(lg_lock_init); void lg_local_lock(struct lglock *lg) { - arch_spinlock_t *lock; + lg_lock_ptr *lock; - preempt_disable(); + migrate_disable(); lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_); lock = this_cpu_ptr(lg->lock); - arch_spin_lock(lock); + lg_do_lock(lock); } EXPORT_SYMBOL(lg_local_lock); void lg_local_unlock(struct lglock *lg) { - arch_spinlock_t *lock; + lg_lock_ptr *lock; lock_release(&lg->lock_dep_map, 1, _RET_IP_); lock = this_cpu_ptr(lg->lock); - arch_spin_unlock(lock); - preempt_enable(); + lg_do_unlock(lock); + migrate_enable(); } EXPORT_SYMBOL(lg_local_unlock); void lg_local_lock_cpu(struct lglock *lg, int cpu) { - arch_spinlock_t *lock; + lg_lock_ptr *lock; - preempt_disable(); + preempt_disable_nort(); lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_); lock = per_cpu_ptr(lg->lock, cpu); - arch_spin_lock(lock); + lg_do_lock(lock); } EXPORT_SYMBOL(lg_local_lock_cpu); void lg_local_unlock_cpu(struct lglock *lg, int cpu) { - arch_spinlock_t *lock; + lg_lock_ptr *lock; lock_release(&lg->lock_dep_map, 1, _RET_IP_); lock = per_cpu_ptr(lg->lock, cpu); - arch_spin_unlock(lock); - preempt_enable(); + lg_do_unlock(lock); + preempt_enable_nort(); } EXPORT_SYMBOL(lg_local_unlock_cpu); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:85 @ void lg_global_lock(struct lglock *lg) { int i; - preempt_disable(); + preempt_disable_nort(); lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_); for_each_possible_cpu(i) { - arch_spinlock_t *lock; + lg_lock_ptr *lock; lock = per_cpu_ptr(lg->lock, i); - arch_spin_lock(lock); + lg_do_lock(lock); } } EXPORT_SYMBOL(lg_global_lock); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:101 @ void lg_global_unlock(struct lglock *lg) lock_release(&lg->lock_dep_map, 1, _RET_IP_); for_each_possible_cpu(i) { - arch_spinlock_t *lock; + lg_lock_ptr *lock; lock = per_cpu_ptr(lg->lock, i); - arch_spin_unlock(lock); + lg_do_unlock(lock); } - preempt_enable(); + preempt_enable_nort(); } EXPORT_SYMBOL(lg_global_unlock); + +#ifdef CONFIG_PREEMPT_RT_FULL +/* + * HACK: If you use this, you get to keep the pieces. + * Used in queue_stop_cpus_work() when stop machinery + * is called from inactive CPU, so we can't schedule. + */ +# define lg_do_trylock_relax(l) \ + do { \ + while (!__rt_spin_trylock(l)) \ + cpu_relax(); \ + } while (0) + +void lg_global_trylock_relax(struct lglock *lg) +{ + int i; + + lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_); + for_each_possible_cpu(i) { + lg_lock_ptr *lock; + lock = per_cpu_ptr(lg->lock, i); + lg_do_trylock_relax(lock); + } +} +#endif Index: linux-3.18.13-rt10-r7s4/kernel/locking/lockdep.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/locking/lockdep.c +++ linux-3.18.13-rt10-r7s4/kernel/locking/lockdep.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3545 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3560 @ static void check_flags(unsigned long fl DEBUG_LOCKS_WARN_ON(!current->softirqs_enabled); } } +#endif if (!debug_locks) print_irqtrace_events(current); Index: linux-3.18.13-rt10-r7s4/kernel/locking/percpu-rwsem.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/locking/percpu-rwsem.c +++ linux-3.18.13-rt10-r7s4/kernel/locking/percpu-rwsem.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:87 @ void percpu_down_read(struct percpu_rw_s down_read(&brw->rw_sem); atomic_inc(&brw->slow_read_ctr); +#ifdef CONFIG_PREEMPT_RT_FULL + up_read(&brw->rw_sem); +#else /* avoid up_read()->rwsem_release() */ __up_read(&brw->rw_sem); +#endif } void percpu_up_read(struct percpu_rw_semaphore *brw) Index: linux-3.18.13-rt10-r7s4/kernel/locking/rt.c =================================================================== --- /dev/null +++ linux-3.18.13-rt10-r7s4/kernel/locking/rt.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:4 @ +/* + * kernel/rt.c + * + * Real-Time Preemption Support + * + * started by Ingo Molnar: + * + * Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> + * Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com> + * + * 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 <andrea@suse.de> + * - 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 <tglx@timesys.com> + * - 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 <rostedt@goodmis.org> + * - debugged and patched Thomas Gleixner's rework. + * - added back the cmpxchg to the rework. + * - turned atomic require back on for SMP. + */ + +#include <linux/spinlock.h> +#include <linux/rtmutex.h> +#include <linux/sched.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/kallsyms.h> +#include <linux/syscalls.h> +#include <linux/interrupt.h> +#include <linux/plist.h> +#include <linux/fs.h> +#include <linux/futex.h> +#include <linux/hrtimer.h> + +#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(&lock->lock); +} +EXPORT_SYMBOL(_mutex_lock); + +int __lockfunc _mutex_lock_interruptible(struct mutex *lock) +{ + int ret; + + mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_); + ret = rt_mutex_lock_interruptible(&lock->lock); + 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_killable(&lock->lock); + 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(&lock->lock); +} +EXPORT_SYMBOL(_mutex_lock_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(&lock->lock); +} +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_interruptible(&lock->lock); + 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_killable(&lock->lock); + 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); + +/* + * rwlock_t functions + */ +int __lockfunc rt_write_trylock(rwlock_t *rwlock) +{ + int ret; + + migrate_disable(); + ret = rt_mutex_trylock(&rwlock->lock); + if (ret) + rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_); + else + migrate_enable(); + + return ret; +} +EXPORT_SYMBOL(rt_write_trylock); + +int __lockfunc rt_write_trylock_irqsave(rwlock_t *rwlock, unsigned long *flags) +{ + int ret; + + *flags = 0; + ret = rt_write_trylock(rwlock); + return ret; +} +EXPORT_SYMBOL(rt_write_trylock_irqsave); + +int __lockfunc rt_read_trylock(rwlock_t *rwlock) +{ + struct rt_mutex *lock = &rwlock->lock; + int ret = 1; + + /* + * recursive read locks succeed when current owns the lock, + * but not when read_depth == 0 which means that the lock is + * write locked. + */ + if (rt_mutex_owner(lock) != current) { + migrate_disable(); + ret = rt_mutex_trylock(lock); + if (ret) + rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_); + else + migrate_enable(); + + } else if (!rwlock->read_depth) { + ret = 0; + } + + if (ret) + rwlock->read_depth++; + + return ret; +} +EXPORT_SYMBOL(rt_read_trylock); + +void __lockfunc rt_write_lock(rwlock_t *rwlock) +{ + rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_); + migrate_disable(); + __rt_spin_lock(&rwlock->lock); +} +EXPORT_SYMBOL(rt_write_lock); + +void __lockfunc rt_read_lock(rwlock_t *rwlock) +{ + struct rt_mutex *lock = &rwlock->lock; + + + /* + * recursive read locks succeed when current owns the lock + */ + if (rt_mutex_owner(lock) != current) { + migrate_disable(); + rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_); + __rt_spin_lock(lock); + } + rwlock->read_depth++; +} + +EXPORT_SYMBOL(rt_read_lock); + +void __lockfunc rt_write_unlock(rwlock_t *rwlock) +{ + /* NOTE: we always pass in '1' for nested, for simplicity */ + rwlock_release(&rwlock->dep_map, 1, _RET_IP_); + __rt_spin_unlock(&rwlock->lock); + migrate_enable(); +} +EXPORT_SYMBOL(rt_write_unlock); + +void __lockfunc rt_read_unlock(rwlock_t *rwlock) +{ + /* Release the lock only when read_depth is down to 0 */ + if (--rwlock->read_depth == 0) { + rwlock_release(&rwlock->dep_map, 1, _RET_IP_); + __rt_spin_unlock(&rwlock->lock); + migrate_enable(); + } +} +EXPORT_SYMBOL(rt_read_unlock); + +unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock) +{ + rt_write_lock(rwlock); + + return 0; +} +EXPORT_SYMBOL(rt_write_lock_irqsave); + +unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock) +{ + rt_read_lock(rwlock); + + return 0; +} +EXPORT_SYMBOL(rt_read_lock_irqsave); + +void __rt_rwlock_init(rwlock_t *rwlock, 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 *)rwlock, sizeof(*rwlock)); + lockdep_init_map(&rwlock->dep_map, name, key, 0); +#endif + rwlock->lock.save_state = 1; + rwlock->read_depth = 0; +} +EXPORT_SYMBOL(__rt_rwlock_init); + +/* + * rw_semaphores + */ + +void rt_up_write(struct rw_semaphore *rwsem) +{ + rwsem_release(&rwsem->dep_map, 1, _RET_IP_); + rt_mutex_unlock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_up_write); + +void rt_up_read(struct rw_semaphore *rwsem) +{ + rwsem_release(&rwsem->dep_map, 1, _RET_IP_); + if (--rwsem->read_depth == 0) + rt_mutex_unlock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_up_read); + +/* + * downgrade a write lock into a read lock + * - just wake up any readers at the front of the queue + */ +void rt_downgrade_write(struct rw_semaphore *rwsem) +{ + BUG_ON(rt_mutex_owner(&rwsem->lock) != current); + rwsem->read_depth = 1; +} +EXPORT_SYMBOL(rt_downgrade_write); + +int rt_down_write_trylock(struct rw_semaphore *rwsem) +{ + int ret = rt_mutex_trylock(&rwsem->lock); + + if (ret) + rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_); + return ret; +} +EXPORT_SYMBOL(rt_down_write_trylock); + +void rt_down_write(struct rw_semaphore *rwsem) +{ + rwsem_acquire(&rwsem->dep_map, 0, 0, _RET_IP_); + rt_mutex_lock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_down_write); + +void rt_down_write_nested(struct rw_semaphore *rwsem, int subclass) +{ + rwsem_acquire(&rwsem->dep_map, subclass, 0, _RET_IP_); + rt_mutex_lock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_down_write_nested); + +void rt_down_write_nested_lock(struct rw_semaphore *rwsem, + struct lockdep_map *nest) +{ + rwsem_acquire_nest(&rwsem->dep_map, 0, 0, nest, _RET_IP_); + rt_mutex_lock(&rwsem->lock); +} +EXPORT_SYMBOL(rt_down_write_nested_lock); + +int rt_down_read_trylock(struct rw_semaphore *rwsem) +{ + struct rt_mutex *lock = &rwsem->lock; + int ret = 1; + + /* + * recursive read locks succeed when current owns the rwsem, + * but not when read_depth == 0 which means that the rwsem is + * write locked. + */ + if (rt_mutex_owner(lock) != current) + ret = rt_mutex_trylock(&rwsem->lock); + else if (!rwsem->read_depth) + ret = 0; + + if (ret) { + rwsem->read_depth++; + rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_); + } + return ret; +} +EXPORT_SYMBOL(rt_down_read_trylock); + +static void __rt_down_read(struct rw_semaphore *rwsem, int subclass) +{ + struct rt_mutex *lock = &rwsem->lock; + + rwsem_acquire_read(&rwsem->dep_map, subclass, 0, _RET_IP_); + + if (rt_mutex_owner(lock) != current) + rt_mutex_lock(&rwsem->lock); + rwsem->read_depth++; +} + +void rt_down_read(struct rw_semaphore *rwsem) +{ + __rt_down_read(rwsem, 0); +} +EXPORT_SYMBOL(rt_down_read); + +void rt_down_read_nested(struct rw_semaphore *rwsem, int subclass) +{ + __rt_down_read(rwsem, subclass); +} +EXPORT_SYMBOL(rt_down_read_nested); + +void __rt_rwsem_init(struct rw_semaphore *rwsem, 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 *)rwsem, sizeof(*rwsem)); + lockdep_init_map(&rwsem->dep_map, name, key, 0); +#endif + rwsem->read_depth = 0; + rwsem->lock.save_state = 0; +} +EXPORT_SYMBOL(__rt_rwsem_init); + +/** + * 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-3.18.13-rt10-r7s4/kernel/locking/rtmutex.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/locking/rtmutex.c +++ linux-3.18.13-rt10-r7s4/kernel/locking/rtmutex.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:10 @ * Copyright (C) 2005-2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com> * 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 <srostedt@redhat.com> * * See Documentation/locking/rt-mutex-design.txt for details. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:24 @ #include <linux/sched/rt.h> #include <linux/sched/deadline.h> #include <linux/timer.h> +#include <linux/ww_mutex.h> #include "rtmutex_common.h" @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:78 @ static void fixup_rt_mutex_waiters(struc clear_rt_mutex_waiters(lock); } +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 the architecture * supports cmpxchg and if there's no debugging state to be set up @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:348 @ 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: */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:363 @ 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; } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:501 @ 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; /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:663 @ 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(&lock->wait_lock); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:765 @ static int rt_mutex_adjust_prio_chain(st return ret; } + +#define STEAL_NORMAL 0 +#define STEAL_LATERAL 1 + +/* + * Note that RT tasks are excluded from lateral-steals to prevent the + * introduction of an unbounded latency + */ +static inline int lock_is_stealable(struct task_struct *task, + struct task_struct *pendowner, int mode) +{ + if (mode == STEAL_NORMAL || rt_task(task)) { + if (task->prio >= pendowner->prio) + return 0; + } else if (task->prio > pendowner->prio) + return 0; + return 1; +} + /* * Try to take an rt-mutex * @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:794 @ static int rt_mutex_adjust_prio_chain(st * @waiter: The waiter that is queued to the lock's wait list if the * callsite called task_blocked_on_lock(), otherwise NULL */ -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) { unsigned long flags; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:835 @ static int try_to_take_rt_mutex(struct r * If waiter is not the highest priority waiter of * @lock, give up. */ - if (waiter != rt_mutex_top_waiter(lock)) + if (waiter != rt_mutex_top_waiter(lock)) { + /* XXX lock_is_stealable() ? */ return 0; + } /* * We can acquire the lock. Remove the waiter from the @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:856 @ static int try_to_take_rt_mutex(struct r * not need to be dequeued. */ 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 >= rt_mutex_top_waiter(lock)->prio) - return 0; + struct task_struct *pown = rt_mutex_top_waiter(lock)->task; + if (task != pown && !lock_is_stealable(task, pown, mode)) + return 0; /* * The current top waiter stays enqueued. We * don't have to change anything in the lock @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:908 @ 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(); + + if (likely(rt_mutex_cmpxchg(lock, NULL, current))) + rt_mutex_deadlock_account_lock(lock, current); + 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(lock, current, NULL))) + rt_mutex_deadlock_account_unlock(current); + 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 + +# define pi_lock(lock) raw_spin_lock_irq(lock) +# define pi_unlock(lock) raw_spin_unlock_irq(lock) + +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. + */ +static void noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock) +{ + struct task_struct *lock_owner, *self = current; + struct rt_mutex_waiter waiter, *top_waiter; + int ret; + + rt_mutex_init_waiter(&waiter, true); + + raw_spin_lock(&lock->wait_lock); + + if (__try_to_take_rt_mutex(lock, self, NULL, STEAL_LATERAL)) { + raw_spin_unlock(&lock->wait_lock); + 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(). + */ + pi_lock(&self->pi_lock); + self->saved_state = self->state; + __set_current_state(TASK_UNINTERRUPTIBLE); + pi_unlock(&self->pi_lock); + + ret = task_blocks_on_rt_mutex(lock, &waiter, self, 0); + 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(&lock->wait_lock); + + debug_rt_mutex_print_deadlock(&waiter); + + if (top_waiter != &waiter || adaptive_wait(lock, lock_owner)) + schedule_rt_mutex(lock); + + raw_spin_lock(&lock->wait_lock); + + pi_lock(&self->pi_lock); + __set_current_state(TASK_UNINTERRUPTIBLE); + pi_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. + */ + pi_lock(&self->pi_lock); + __set_current_state(self->saved_state); + self->saved_state = TASK_RUNNING; + pi_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)); + + raw_spin_unlock(&lock->wait_lock); + + debug_rt_mutex_free_waiter(&waiter); +} + +static void wakeup_next_waiter(struct rt_mutex *lock); +/* + * Slow path to release a rt_mutex spin_lock style + */ +static void __sched __rt_spin_lock_slowunlock(struct rt_mutex *lock) +{ + debug_rt_mutex_unlock(lock); + + rt_mutex_deadlock_account_unlock(current); + + if (!rt_mutex_has_waiters(lock)) { + lock->owner = NULL; + raw_spin_unlock(&lock->wait_lock); + return; + } + + wakeup_next_waiter(lock); + + raw_spin_unlock(&lock->wait_lock); + + /* Undo pi boosting.when necessary */ + rt_mutex_adjust_prio(current); +} + +static void noinline __sched rt_spin_lock_slowunlock(struct rt_mutex *lock) +{ + raw_spin_lock(&lock->wait_lock); + __rt_spin_lock_slowunlock(lock); +} + +static void noinline __sched rt_spin_lock_slowunlock_hirq(struct rt_mutex *lock) +{ + int ret; + + do { + ret = raw_spin_trylock(&lock->wait_lock); + } while (!ret); + + __rt_spin_lock_slowunlock(lock); +} + +void __lockfunc rt_spin_lock(spinlock_t *lock) +{ + rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock); + spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); +} +EXPORT_SYMBOL(rt_spin_lock); + +void __lockfunc __rt_spin_lock(struct rt_mutex *lock) +{ + rt_spin_lock_fastlock(lock, rt_spin_lock_slowlock); +} +EXPORT_SYMBOL(__rt_spin_lock); + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass) +{ + rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock); + spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_); +} +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); +} +EXPORT_SYMBOL(rt_spin_unlock); + +void __lockfunc rt_spin_unlock_after_trylock_in_irq(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_hirq); +} + +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(struct rt_mutex *lock) +{ + return rt_mutex_trylock(lock); +} + +int __lockfunc rt_spin_trylock(spinlock_t *lock) +{ + int ret = rt_mutex_trylock(&lock->lock); + + if (ret) + spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); + 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; + migrate_disable(); + rt_spin_lock(lock); + if (atomic_dec_and_test(atomic)) + return 1; + rt_spin_unlock(lock); + migrate_enable(); + return 0; +} +EXPORT_SYMBOL(atomic_dec_and_spin_lock); + + void +__rt_spin_lock_init(spinlock_t *lock, 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. * @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1302 @ static int task_blocks_on_rt_mutex(struc return -EDEADLK; raw_spin_lock_irqsave(&task->pi_lock, flags); + + /* + * 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_irqrestore(&task->pi_lock, flags); + return -EAGAIN; + } + + BUG_ON(rt_mutex_real_waiter(task->pi_blocked_on)); + __rt_mutex_adjust_prio(task); waiter->task = task; waiter->lock = lock; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1342 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1419 @ static void wakeup_next_waiter(struct rt * long as we hold lock->wait_lock. The waiter task needs to * acquire it in order to dequeue the waiter. */ - wake_up_process(waiter->task); + rt_mutex_wake_waiter(waiter); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1433 @ 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; unsigned long flags; raw_spin_lock_irqsave(¤t->pi_lock, flags); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1458 @ 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_irqrestore(&owner->pi_lock, flags); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1495 @ void rt_mutex_adjust_pi(struct task_stru raw_spin_lock_irqsave(&task->pi_lock, flags); waiter = task->pi_blocked_on; - if (!waiter || (waiter->prio == task->prio && + if (!rt_mutex_real_waiter(waiter) || (waiter->prio == task->prio && !dl_prio(task->prio))) { 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); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1523 @ void rt_mutex_adjust_pi(struct task_stru 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1547 @ __rt_mutex_slowlock(struct rt_mutex *loc break; } + if (ww_ctx && ww_ctx->acquired > 0) { + ret = __mutex_lock_check_stamp(lock, ww_ctx); + if (ret) + break; + } + raw_spin_unlock(&lock->wait_lock); debug_rt_mutex_print_deadlock(waiter); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1586 @ static void rt_mutex_handle_deadlock(int } } +static __always_inline void ww_mutex_lock_acquired(struct ww_mutex *ww, + struct ww_acquire_ctx *ww_ctx) +{ +#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); + + /* + * 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; + } + + /* + * Naughty, using a different class will lead to undefined behavior! + */ + 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, + 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 + /* * Slow path lock function: */ static int __sched rt_mutex_slowlock(struct rt_mutex *lock, int state, struct hrtimer_sleeper *timeout, - enum rtmutex_chainwalk chwalk) + enum rtmutex_chainwalk chwalk, + struct ww_acquire_ctx *ww_ctx) { struct rt_mutex_waiter waiter; int ret = 0; - debug_rt_mutex_init_waiter(&waiter); - RB_CLEAR_NODE(&waiter.pi_tree_entry); - RB_CLEAR_NODE(&waiter.tree_entry); + rt_mutex_init_waiter(&waiter, false); raw_spin_lock(&lock->wait_lock); /* Try to acquire the lock again: */ if (try_to_take_rt_mutex(lock, current, NULL)) { + if (ww_ctx) + ww_mutex_account_lock(lock, ww_ctx); raw_spin_unlock(&lock->wait_lock); return 0; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1698 @ rt_mutex_slowlock(struct rt_mutex *lock, ret = task_blocks_on_rt_mutex(lock, &waiter, current, chwalk); if (likely(!ret)) - 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); + } set_current_state(TASK_RUNNING); if (unlikely(ret)) { if (rt_mutex_has_waiters(lock)) remove_waiter(lock, &waiter); - rt_mutex_handle_deadlock(ret, chwalk, &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); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1753 @ static inline int rt_mutex_slowtrylock(s * The mutex has currently no owner. Lock the wait lock and * try to acquire the lock. */ - raw_spin_lock(&lock->wait_lock); + if (!raw_spin_trylock(&lock->wait_lock)) + return 0; ret = try_to_take_rt_mutex(lock, current, NULL); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1840 @ rt_mutex_slowunlock(struct rt_mutex *loc */ 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(lock, NULL, current))) { rt_mutex_deadlock_account_lock(lock, current); return 0; } else - return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK); + 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(lock, NULL, current))) { rt_mutex_deadlock_account_lock(lock, current); return 0; } else - return slowfn(lock, state, timeout, chwalk); + return slowfn(lock, state, timeout, chwalk, ww_ctx); } static inline int @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1902 @ void __sched rt_mutex_lock(struct rt_mut { might_sleep(); - rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, rt_mutex_slowlock); + rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, NULL, rt_mutex_slowlock); } EXPORT_SYMBOL_GPL(rt_mutex_lock); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1919 @ int __sched rt_mutex_lock_interruptible( { might_sleep(); - return rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE, rt_mutex_slowlock); + return rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE, NULL, rt_mutex_slowlock); } EXPORT_SYMBOL_GPL(rt_mutex_lock_interruptible); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1932 @ int rt_mutex_timed_futex_lock(struct rt_ might_sleep(); return rt_mutex_timed_fastlock(lock, TASK_INTERRUPTIBLE, timeout, - RT_MUTEX_FULL_CHAINWALK, + RT_MUTEX_FULL_CHAINWALK, NULL, rt_mutex_slowlock); } /** + * 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 + * -EDEADLK when the lock would deadlock (when deadlock detection is on) + */ +int __sched rt_mutex_lock_killable(struct rt_mutex *lock) +{ + might_sleep(); + + return rt_mutex_fastlock(lock, TASK_KILLABLE, NULL, rt_mutex_slowlock); +} +EXPORT_SYMBOL_GPL(rt_mutex_lock_killable); + +/** * rt_mutex_timed_lock - lock a rt_mutex interruptible * the timeout structure is provided * by the caller @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1975 @ rt_mutex_timed_lock(struct rt_mutex *loc return rt_mutex_timed_fastlock(lock, TASK_INTERRUPTIBLE, timeout, RT_MUTEX_MIN_CHAINWALK, + NULL, rt_mutex_slowlock); } EXPORT_SYMBOL_GPL(rt_mutex_timed_lock); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2034 @ EXPORT_SYMBOL_GPL(rt_mutex_destroy); void __rt_mutex_init(struct rt_mutex *lock, const char *name) { lock->owner = NULL; - raw_spin_lock_init(&lock->wait_lock); lock->waiters = RB_ROOT; lock->waiters_leftmost = NULL; debug_rt_mutex_init(lock, name); } -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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2054 @ EXPORT_SYMBOL_GPL(__rt_mutex_init); void rt_mutex_init_proxy_locked(struct rt_mutex *lock, struct task_struct *proxy_owner) { - __rt_mutex_init(lock, NULL); + rt_mutex_init(lock); debug_rt_mutex_proxy_lock(lock, proxy_owner); rt_mutex_set_owner(lock, proxy_owner); rt_mutex_deadlock_account_lock(lock, proxy_owner); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2102 @ int rt_mutex_start_proxy_lock(struct rt_ 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_irq(&task->pi_lock); + if (task->pi_blocked_on) { + raw_spin_unlock_irq(&task->pi_lock); + raw_spin_unlock(&lock->wait_lock); + return -EAGAIN; + } + task->pi_blocked_on = PI_REQUEUE_INPROGRESS; + raw_spin_unlock_irq(&task->pi_lock); +#endif + /* We enforce deadlock detection for futexes */ ret = task_blocks_on_rt_mutex(lock, waiter, task, RT_MUTEX_FULL_CHAINWALK); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2200 @ int rt_mutex_finish_proxy_lock(struct rt set_current_state(TASK_INTERRUPTIBLE); - ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter); + ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter, NULL); set_current_state(TASK_RUNNING); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2217 @ int rt_mutex_finish_proxy_lock(struct rt return ret; } + +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 *ww_ctx) +{ + int ret; + + might_sleep(); + + mutex_acquire_nest(&lock->base.dep_map, 0, 0, &ww_ctx->dep_map, _RET_IP_); + ret = rt_mutex_slowlock(&lock->base.lock, TASK_INTERRUPTIBLE, NULL, 0, ww_ctx); + if (ret) + mutex_release(&lock->base.dep_map, 1, _RET_IP_); + else if (!ret && ww_ctx->acquired > 1) + return ww_mutex_deadlock_injection(lock, ww_ctx); + + return ret; +} +EXPORT_SYMBOL_GPL(__ww_mutex_lock_interruptible); + +int __sched +__ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ww_ctx) +{ + int ret; + + might_sleep(); + + mutex_acquire_nest(&lock->base.dep_map, 0, 0, &ww_ctx->dep_map, _RET_IP_); + ret = rt_mutex_slowlock(&lock->base.lock, TASK_UNINTERRUPTIBLE, NULL, 0, ww_ctx); + if (ret) + mutex_release(&lock->base.dep_map, 1, _RET_IP_); + else if (!ret && ww_ctx->acquired > 1) + return ww_mutex_deadlock_injection(lock, ww_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); +#endif Index: linux-3.18.13-rt10-r7s4/kernel/locking/rtmutex_common.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/locking/rtmutex_common.h +++ linux-3.18.13-rt10-r7s4/kernel/locking/rtmutex_common.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:52 @ 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; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:123 @ 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); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:145 @ extern int rt_mutex_timed_futex_lock(str # include "rtmutex.h" #endif +static inline void +rt_mutex_init_waiter(struct rt_mutex_waiter *waiter, bool savestate) +{ + debug_rt_mutex_init_waiter(waiter); + waiter->task = NULL; + waiter->savestate = savestate; + RB_CLEAR_NODE(&waiter->pi_tree_entry); + RB_CLEAR_NODE(&waiter->tree_entry); +} + #endif Index: linux-3.18.13-rt10-r7s4/kernel/locking/spinlock.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/locking/spinlock.c +++ linux-3.18.13-rt10-r7s4/kernel/locking/spinlock.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:127 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:215 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:361 @ 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-3.18.13-rt10-r7s4/kernel/locking/spinlock_debug.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/locking/spinlock_debug.c +++ linux-3.18.13-rt10-r7s4/kernel/locking/spinlock_debug.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:34 @ 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) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:52 @ void __rwlock_init(rwlock_t *lock, const } EXPORT_SYMBOL(__rwlock_init); +#endif static void spin_dump(raw_spinlock_t *lock, const char *msg) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:164 @ 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()) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:306 @ void do_raw_write_unlock(rwlock_t *lock) debug_write_unlock(lock); arch_write_unlock(&lock->raw_lock); } + +#endif Index: linux-3.18.13-rt10-r7s4/kernel/panic.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/panic.c +++ linux-3.18.13-rt10-r7s4/kernel/panic.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:387 @ 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-3.18.13-rt10-r7s4/kernel/power/hibernate.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/power/hibernate.c +++ linux-3.18.13-rt10-r7s4/kernel/power/hibernate.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:290 @ static int create_image(int platform_mod local_irq_disable(); + system_state = SYSTEM_SUSPEND; + error = syscore_suspend(); if (error) { printk(KERN_ERR "PM: Some system devices failed to power down, " @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:321 @ static int create_image(int platform_mod syscore_resume(); Enable_irqs: + system_state = SYSTEM_RUNNING; local_irq_enable(); Enable_cpus: @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:445 @ static int resume_target_kernel(bool pla goto Enable_cpus; local_irq_disable(); + system_state = SYSTEM_SUSPEND; error = syscore_suspend(); if (error) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:479 @ static int resume_target_kernel(bool pla syscore_resume(); Enable_irqs: + system_state = SYSTEM_RUNNING; local_irq_enable(); Enable_cpus: @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:565 @ int hibernation_platform_enter(void) goto Platform_finish; local_irq_disable(); + system_state = SYSTEM_SUSPEND; syscore_suspend(); if (pm_wakeup_pending()) { error = -EAGAIN; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:578 @ int hibernation_platform_enter(void) Power_up: syscore_resume(); + system_state = SYSTEM_RUNNING; local_irq_enable(); enable_nonboot_cpus(); Index: linux-3.18.13-rt10-r7s4/kernel/power/suspend.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/power/suspend.c +++ linux-3.18.13-rt10-r7s4/kernel/power/suspend.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:321 @ 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(); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:337 @ static int suspend_enter(suspend_state_t syscore_resume(); } + system_state = SYSTEM_RUNNING; + arch_suspend_enable_irqs(); BUG_ON(irqs_disabled()); Index: linux-3.18.13-rt10-r7s4/kernel/printk/printk.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/printk/printk.c +++ linux-3.18.13-rt10-r7s4/kernel/printk/printk.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1168 @ static int syslog_print_all(char __user { char *text; int len = 0; + int attempts = 0; text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL); if (!text) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1180 @ static int syslog_print_all(char __user u64 seq; u32 idx; enum log_flags prev; - + int num_msg; +try_again: + attempts++; + if (attempts > 10) { + len = -EBUSY; + goto out; + } + num_msg = 0; if (clear_seq < log_first_seq) { /* messages are gone, move to first available one */ clear_seq = log_first_seq; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1208 @ static int syslog_print_all(char __user prev = msg->flags; idx = log_next(idx); seq++; + num_msg++; + if (num_msg > 5) { + num_msg = 0; + raw_spin_unlock_irq(&logbuf_lock); + raw_spin_lock_irq(&logbuf_lock); + if (clear_seq < log_first_seq) + goto try_again; + } } /* move first record forward until length fits into the buffer */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1229 @ static int syslog_print_all(char __user prev = msg->flags; idx = log_next(idx); seq++; + num_msg++; + if (num_msg > 5) { + num_msg = 0; + raw_spin_unlock_irq(&logbuf_lock); + raw_spin_lock_irq(&logbuf_lock); + if (clear_seq < log_first_seq) + goto try_again; + } } /* last message fitting into this dump */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1277 @ static int syslog_print_all(char __user clear_seq = log_next_seq; clear_idx = log_next_idx; } +out: raw_spin_unlock_irq(&logbuf_lock); kfree(text); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1435 @ static void call_console_drivers(int lev if (!console_drivers) return; + migrate_disable(); for_each_console(con) { if (exclusive_console && con != exclusive_console) continue; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1448 @ static void call_console_drivers(int lev continue; con->write(con, text, len); } + migrate_enable(); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1509 @ static inline int can_use_console(unsign static int console_trylock_for_printk(void) { unsigned int cpu = smp_processor_id(); +#ifdef CONFIG_PREEMPT_RT_FULL + int lock = !early_boot_irqs_disabled && (preempt_count() == 0) && + !irqs_disabled(); +#else + int lock = 1; +#endif + + if (!lock) + return 0; if (!console_trylock()) return 0; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1652 @ static size_t cont_print_text(char *text return textlen; } +#ifdef CONFIG_EARLY_PRINTK +struct console *early_console; + +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; +} + +static int forced_early_printk(const char *fmt, va_list ap) +{ + if (!printk_killswitch) + return 0; + early_vprintk(fmt, ap); + return 1; +} +#else +static inline int forced_early_printk(const char *fmt, va_list ap) +{ + return 0; +} +#endif + asmlinkage int vprintk_emit(int facility, int level, const char *dict, size_t dictlen, const char *fmt, va_list args) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1724 @ asmlinkage int vprintk_emit(int facility /* cpu currently holding logbuf_lock in this function */ static volatile unsigned int logbuf_cpu = UINT_MAX; + /* + * Fall back to early_printk if a debugging subsystem has + * killed printk output + */ + if (unlikely(forced_early_printk(fmt, args))) + return 1; + if (level == SCHED_MESSAGE_LOGLEVEL) { level = -1; in_sched = true; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1871 @ asmlinkage int vprintk_emit(int facility * console_sem which would prevent anyone from printing to * console */ - preempt_disable(); - + migrate_disable(); /* * Try to acquire and then immediately release the console * semaphore. The release will print out buffers and wake up @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1879 @ asmlinkage int vprintk_emit(int facility */ if (console_trylock_for_printk()) console_unlock(); - preempt_enable(); + migrate_enable(); lockdep_on(); } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1979 @ static size_t cont_print_text(char *text #endif /* CONFIG_PRINTK */ -#ifdef CONFIG_EARLY_PRINTK -struct console *early_console; - -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 __visible void early_printk(const char *fmt, ...) -{ - va_list ap; - - va_start(ap, fmt); - early_vprintk(fmt, ap); - va_end(ap); -} -#endif - static int __add_preferred_console(char *name, int idx, char *options, char *brl_options) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2218 @ static void console_cont_flush(char *tex goto out; len = cont_print_text(text, size); +#ifndef CONFIG_PREEMPT_RT_FULL raw_spin_unlock(&logbuf_lock); stop_critical_timings(); call_console_drivers(cont.level, text, len); start_critical_timings(); local_irq_restore(flags); +#else + raw_spin_unlock_irqrestore(&logbuf_lock, flags); + call_console_drivers(cont.level, text, len); +#endif return; out: raw_spin_unlock_irqrestore(&logbuf_lock, flags); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2315 @ skip: console_idx = log_next(console_idx); console_seq++; console_prev = msg->flags; +#ifdef CONFIG_PREEMPT_RT_FULL + raw_spin_unlock_irqrestore(&logbuf_lock, flags); + call_console_drivers(level, text, len); +#else raw_spin_unlock(&logbuf_lock); stop_critical_timings(); /* don't trace print latency */ call_console_drivers(level, text, len); start_critical_timings(); local_irq_restore(flags); +#endif } console_locked = 0; Index: linux-3.18.13-rt10-r7s4/kernel/ptrace.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/ptrace.c +++ linux-3.18.13-rt10-r7s4/kernel/ptrace.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:132 @ 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; + raw_spin_lock_irq(&task->pi_lock); + if (task->state & __TASK_TRACED) + task->state = __TASK_TRACED; + else + task->saved_state = __TASK_TRACED; + raw_spin_unlock_irq(&task->pi_lock); ret = true; } spin_unlock_irq(&task->sighand->siglock); Index: linux-3.18.13-rt10-r7s4/kernel/rcu/tiny.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/rcu/tiny.c +++ linux-3.18.13-rt10-r7s4/kernel/rcu/tiny.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:373 @ void call_rcu_sched(struct rcu_head *hea } EXPORT_SYMBOL_GPL(call_rcu_sched); +#ifndef CONFIG_PREEMPT_RT_FULL /* * Post an RCU bottom-half callback to be invoked after any subsequent * quiescent state. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:383 @ void call_rcu_bh(struct rcu_head *head, __call_rcu(head, func, &rcu_bh_ctrlblk); } EXPORT_SYMBOL_GPL(call_rcu_bh); +#endif void rcu_init(void) { Index: linux-3.18.13-rt10-r7s4/kernel/rcu/tree.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/rcu/tree.c +++ linux-3.18.13-rt10-r7s4/kernel/rcu/tree.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:59 @ #include <linux/random.h> #include <linux/ftrace_event.h> #include <linux/suspend.h> +#include <linux/delay.h> +#include <linux/gfp.h> +#include <linux/oom.h> +#include <linux/smpboot.h> +#include "../time/tick-internal.h" #include "tree.h" #include "rcu.h" @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:160 @ EXPORT_SYMBOL_GPL(rcu_scheduler_active); */ static int rcu_scheduler_fully_active __read_mostly; -#ifdef CONFIG_RCU_BOOST - /* * Control variables for per-CPU and per-rcu_node kthreads. These * handle all flavors of RCU. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:169 @ DEFINE_PER_CPU(unsigned int, rcu_cpu_kth DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_loops); DEFINE_PER_CPU(char, rcu_cpu_has_work); -#endif /* #ifdef CONFIG_RCU_BOOST */ - static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu); static void invoke_rcu_core(void); static void invoke_rcu_callbacks(struct rcu_state *rsp, struct rcu_data *rdp); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:211 @ void rcu_sched_qs(void) } } +#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) { if (!__this_cpu_read(rcu_bh_data.passed_quiesce)) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:233 @ void rcu_bh_qs(void) __this_cpu_write(rcu_bh_data.passed_quiesce, 1); } } +#endif static DEFINE_PER_CPU(int, rcu_sched_qs_mask); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:354 @ long rcu_batches_completed_sched(void) } EXPORT_SYMBOL_GPL(rcu_batches_completed_sched); +#ifndef CONFIG_PREEMPT_RT_FULL /* * Return the number of RCU BH batches processed thus far for debug & stats. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:382 @ 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 + /* * Show the state of the grace-period kthreads. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1437 @ static void rcu_gp_kthread_wake(struct r !ACCESS_ONCE(rsp->gp_flags) || !rsp->gp_kthread) return; - wake_up(&rsp->gp_wq); + swait_wake(&rsp->gp_wq); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1819 @ static int __noreturn rcu_gp_kthread(voi ACCESS_ONCE(rsp->gpnum), TPS("reqwait")); rsp->gp_state = RCU_GP_WAIT_GPS; - wait_event_interruptible(rsp->gp_wq, + swait_event_interruptible(rsp->gp_wq, ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_INIT); /* Locking provides needed memory barrier. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1847 @ static int __noreturn rcu_gp_kthread(voi ACCESS_ONCE(rsp->gpnum), TPS("fqswait")); rsp->gp_state = RCU_GP_WAIT_FQS; - ret = wait_event_interruptible_timeout(rsp->gp_wq, + ret = swait_event_interruptible_timeout(rsp->gp_wq, ((gf = ACCESS_ONCE(rsp->gp_flags)) & RCU_GP_FLAG_FQS) || (!ACCESS_ONCE(rnp->qsmask) && @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2591 @ __rcu_process_callbacks(struct rcu_state /* * Do RCU core processing for the current CPU. */ -static void rcu_process_callbacks(struct softirq_action *unused) +static 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")); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2612 @ static void invoke_rcu_callbacks(struct { if (unlikely(!ACCESS_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 = &__get_cpu_var(rcu_cpu_kthread_status); + char work, *workp = &__get_cpu_var(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. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2845 @ void call_rcu_sched(struct rcu_head *hea } EXPORT_SYMBOL_GPL(call_rcu_sched); +#ifndef CONFIG_PREEMPT_RT_FULL /* * Queue an RCU callback for invocation after a quicker grace period. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2854 @ 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. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2946 @ 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. * @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2973 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3456 @ 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. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3465 @ 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. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3775 @ static void __init rcu_init_one(struct r } rsp->rda = rda; - init_waitqueue_head(&rsp->gp_wq); + init_swait_head(&rsp->gp_wq); rnp = rsp->level[rcu_num_lvls - 1]; for_each_possible_cpu(i) { while (i > rnp->grphi) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:3872 @ void __init rcu_init(void) rcu_init_one(&rcu_bh_state, &rcu_bh_data); rcu_init_one(&rcu_sched_state, &rcu_sched_data); __rcu_init_preempt(); - open_softirq(RCU_SOFTIRQ, rcu_process_callbacks); /* * We don't need protection against CPU-hotplug here because Index: linux-3.18.13-rt10-r7s4/kernel/rcu/tree.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/rcu/tree.h +++ linux-3.18.13-rt10-r7s4/kernel/rcu/tree.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:31 @ #include <linux/cpumask.h> #include <linux/seqlock.h> #include <linux/irq_work.h> +#include <linux/wait-simple.h> /* * Define shape of hierarchy based on NR_CPUS, CONFIG_RCU_FANOUT, and @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:176 @ struct rcu_node { /* queued on this rcu_node structure that */ /* are blocking the current grace period, */ /* there can be no such task. */ - struct completion boost_completion; - /* Used to ensure that the rt_mutex used */ - /* to carry out the boosting is fully */ - /* released with no future boostee accesses */ - /* before that rt_mutex is re-initialized. */ struct rt_mutex boost_mtx; /* Used only for the priority-boosting */ /* side effect, not as a lock. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:207 @ struct rcu_node { /* This can happen due to race conditions. */ #endif /* #ifdef CONFIG_RCU_BOOST */ #ifdef CONFIG_RCU_NOCB_CPU - wait_queue_head_t nocb_gp_wq[2]; + struct swait_head nocb_gp_wq[2]; /* Place for rcu_nocb_kthread() to wait GP. */ #endif /* #ifdef CONFIG_RCU_NOCB_CPU */ int need_future_gp[2]; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:347 @ struct rcu_data { atomic_long_t nocb_follower_count_lazy; /* (approximate). */ int nocb_p_count; /* # CBs being invoked by kthread */ int nocb_p_count_lazy; /* (approximate). */ - wait_queue_head_t nocb_wq; /* For nocb kthreads to sleep on. */ + struct swait_head nocb_wq; /* For nocb kthreads to sleep on. */ struct task_struct *nocb_kthread; int nocb_defer_wakeup; /* Defer wakeup of nocb_kthread. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:438 @ struct rcu_state { unsigned long gpnum; /* Current gp number. */ unsigned long completed; /* # of last completed gp. */ struct task_struct *gp_kthread; /* Task for grace periods. */ - wait_queue_head_t gp_wq; /* Where GP task waits. */ + struct swait_head gp_wq; /* Where GP task waits. */ short gp_flags; /* Commands for GP task. */ short gp_state; /* GP kthread sleep state. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:569 @ static void rcu_report_exp_rnp(struct rc 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-3.18.13-rt10-r7s4/kernel/rcu/tree_plugin.h =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/rcu/tree_plugin.h +++ linux-3.18.13-rt10-r7s4/kernel/rcu/tree_plugin.h @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:27 @ * Paul E. McKenney <paulmck@linux.vnet.ibm.com> */ -#include <linux/delay.h> -#include <linux/gfp.h> -#include <linux/oom.h> -#include <linux/smpboot.h> -#include "../time/tick-internal.h" - #define RCU_KTHREAD_PRIO 1 #ifdef CONFIG_RCU_BOOST @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:332 @ void rcu_read_unlock_special(struct task } /* Hardware IRQ handlers cannot block, complain if they get here. */ - if (WARN_ON_ONCE(in_irq() || in_serving_softirq())) { + if (WARN_ON_ONCE(preempt_count() & (HARDIRQ_MASK | SOFTIRQ_OFFSET))) { local_irq_restore(flags); return; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:395 @ void rcu_read_unlock_special(struct task #ifdef CONFIG_RCU_BOOST /* Unboost if we were boosted. */ - if (drop_boost_mutex) { + if (drop_boost_mutex) rt_mutex_unlock(&rnp->boost_mtx); - complete(&rnp->boost_completion); - } #endif /* #ifdef CONFIG_RCU_BOOST */ /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:630 @ 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_preempt_state, this_cpu_ptr(&rcu_preempt_data)); -} - -#endif /* #ifdef CONFIG_RCU_BOOST */ - /* * Queue a preemptible-RCU callback for invocation after a grace period. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1058 @ void exit_rcu(void) #endif /* #else #ifdef CONFIG_TREE_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 = RCU_KTHREAD_PRIO; + sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); +#endif /* #ifdef CONFIG_RCU_BOOST */ +} + #ifdef CONFIG_RCU_BOOST #include "../locking/rtmutex_common.h" @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1102 @ static void rcu_initiate_boost_trace(str #endif /* #else #ifdef CONFIG_RCU_TRACE */ -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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1164 @ static int rcu_boost(struct rcu_node *rn */ t = container_of(tb, struct task_struct, rcu_node_entry); rt_mutex_init_proxy_locked(&rnp->boost_mtx, t); - init_completion(&rnp->boost_completion); raw_spin_unlock_irqrestore(&rnp->lock, flags); /* Lock only for side effect: boosts task t's priority. */ rt_mutex_lock(&rnp->boost_mtx); rt_mutex_unlock(&rnp->boost_mtx); /* Then keep lockdep happy. */ - /* Wait for boostee to be done w/boost_mtx before reinitializing. */ - wait_for_completion(&rnp->boost_completion); - return ACCESS_ONCE(rnp->exp_tasks) != NULL || ACCESS_ONCE(rnp->boost_tasks) != NULL; } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1246 @ 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. */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1300 @ 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 = RCU_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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1333 @ 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)); rnp = rcu_get_root(rcu_state_p); (void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp); if (NUM_RCU_NODES > 1) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1366 @ static void rcu_initiate_boost(struct rc raw_spin_unlock_irqrestore(&rnp->lock, flags); } -static void invoke_rcu_callbacks_kthread(void) -{ - WARN_ON_ONCE(1); -} - static bool rcu_is_callbacks_kthread(void) { return false; @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1389 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1407 @ int rcu_needs_cpu(int cpu, unsigned long return rcu_cpu_has_callbacks(cpu, NULL); } #endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */ +#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. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1506 @ 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 @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1548 @ int rcu_needs_cpu(int cpu, unsigned long return 0; } #endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */ - +#endif /* #ifndef CONFIG_PREEMPT_RT_FULL */ /* * Prepare a CPU for idle from an RCU perspective. The first major task * is to sense whether nohz mode has been enabled or disabled via sysfs. @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1894 @ early_param("rcu_nocb_poll", parse_rcu_n */ static void rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp) { - wake_up_all(&rnp->nocb_gp_wq[rnp->completed & 0x1]); + swait_wake_all(&rnp->nocb_gp_wq[rnp->completed & 0x1]); } /* @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1912 @ static void rcu_nocb_gp_set(struct rcu_n static void rcu_init_one_nocb(struct rcu_node *rnp) { - init_waitqueue_head(&rnp->nocb_gp_wq[0]); - init_waitqueue_head(&rnp->nocb_gp_wq[1]); + init_swait_head(&rnp->nocb_gp_wq[0]); + init_swait_head(&rnp->nocb_gp_wq[1]); } #ifndef CONFIG_RCU_NOCB_CPU_ALL @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:1938 @ static void wake_nocb_leader(struct rcu_ if (ACCESS_ONCE(rdp_leader->nocb_leader_sleep) || force) { /* Prior smp_mb__after_atomic() orders against prior enqueue. */ ACCESS_ONCE(rdp_leader->nocb_leader_sleep) = false; - wake_up(&rdp_leader->nocb_wq); + swait_wake(&rdp_leader->nocb_wq); } } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2131 @ static void rcu_nocb_wait_gp(struct rcu_ */ trace_rcu_future_gp(rnp, rdp, c, TPS("StartWait")); for (;;) { - wait_event_interruptible( + swait_event_interruptible( rnp->nocb_gp_wq[c & 0x1], (d = ULONG_CMP_GE(ACCESS_ONCE(rnp->completed), c))); if (likely(d)) @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2159 @ wait_again: /* Wait for callbacks to appear. */ if (!rcu_nocb_poll) { trace_rcu_nocb_wake(my_rdp->rsp->name, my_rdp->cpu, "Sleep"); - wait_event_interruptible(my_rdp->nocb_wq, + swait_event_interruptible(my_rdp->nocb_wq, !ACCESS_ONCE(my_rdp->nocb_leader_sleep)); /* Memory barrier handled by smp_mb() calls below and repoll. */ } else if (firsttime) { @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2240 @ wait_again: * List was empty, wake up the follower. * Memory barriers supplied by atomic_long_add(). */ - wake_up(&rdp->nocb_wq); + swait_wake(&rdp->nocb_wq); } } @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2261 @ static void nocb_follower_wait(struct rc if (!rcu_nocb_poll) { trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu, "FollowerSleep"); - wait_event_interruptible(rdp->nocb_wq, + swait_event_interruptible(rdp->nocb_wq, ACCESS_ONCE(rdp->nocb_follower_head)); } else if (firsttime) { /* Don't drown trace log with "Poll"! */ @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:2432 @ void __init rcu_init_nohz(void) static void __init rcu_boot_init_nocb_percpu_data(struct rcu_data *rdp) { rdp->nocb_tail = &rdp->nocb_head; - init_waitqueue_head(&rdp->nocb_wq); + init_swait_head(&rdp->nocb_wq); rdp->nocb_follower_tail = &rdp->nocb_follower_head; } Index: linux-3.18.13-rt10-r7s4/kernel/rcu/update.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/rcu/update.c +++ linux-3.18.13-rt10-r7s4/kernel/rcu/update.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:173 @ 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? * @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:200 @ 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-3.18.13-rt10-r7s4/kernel/relay.c =================================================================== --- linux-3.18.13-rt10-r7s4.orig/kernel/relay.c +++ linux-3.18.13-rt10-r7s4/kernel/relay.c @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:342 @ static void wakeup_readers(unsigned long { struct rchan_buf *buf = (struct rchan_buf *)data; wake_up_interruptible(&buf->read_wait); + /* + * Stupid polling for now: + */ + mod_timer(&buf->timer, jiffies + 1); } /** @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:363 @ static void __relay_reset(struct rchan_b init_waitqueue_head(&buf->read_wait); kref_init(&buf->kref); setup_timer(&buf->timer, wakeup_readers, (unsigned long)buf); + mod_timer(&buf->timer, jiffies + 1); } else del_timer_sync(&buf->timer); @ linux-3.18.13-rt10-r7s4/Documentation/hwlat_detector.txt:747 @ size_t relay_switch_subbuf(struct rchan_ else buf->early_bytes += buf->chan->subbuf_size - buf->padding