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kernel/watchdog.c
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/* * Detect hard and soft lockups on a system * * started by Don Zickus, Copyright (C) 2010 Red Hat, Inc. * |
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* Note: Most of this code is borrowed heavily from the original softlockup * detector, so thanks to Ingo for the initial implementation. * Some chunks also taken from the old x86-specific nmi watchdog code, thanks |
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* to those contributors as well. */ |
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#define pr_fmt(fmt) "NMI watchdog: " fmt |
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#include <linux/mm.h> #include <linux/cpu.h> #include <linux/nmi.h> #include <linux/init.h> |
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#include <linux/module.h> #include <linux/sysctl.h> |
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#include <linux/smpboot.h> |
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#include <linux/sched/rt.h> |
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#include <asm/irq_regs.h> |
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#include <linux/kvm_para.h> |
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#include <linux/perf_event.h> |
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/* * The run state of the lockup detectors is controlled by the content of the * 'watchdog_enabled' variable. Each lockup detector has its dedicated bit - * bit 0 for the hard lockup detector and bit 1 for the soft lockup detector. * * 'watchdog_user_enabled', 'nmi_watchdog_enabled' and 'soft_watchdog_enabled' * are variables that are only used as an 'interface' between the parameters * in /proc/sys/kernel and the internal state bits in 'watchdog_enabled'. The * 'watchdog_thresh' variable is handled differently because its value is not * boolean, and the lockup detectors are 'suspended' while 'watchdog_thresh' * is equal zero. */ #define NMI_WATCHDOG_ENABLED_BIT 0 #define SOFT_WATCHDOG_ENABLED_BIT 1 #define NMI_WATCHDOG_ENABLED (1 << NMI_WATCHDOG_ENABLED_BIT) #define SOFT_WATCHDOG_ENABLED (1 << SOFT_WATCHDOG_ENABLED_BIT) |
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static DEFINE_MUTEX(watchdog_proc_mutex); |
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#ifdef CONFIG_HARDLOCKUP_DETECTOR static unsigned long __read_mostly watchdog_enabled = SOFT_WATCHDOG_ENABLED|NMI_WATCHDOG_ENABLED; #else static unsigned long __read_mostly watchdog_enabled = SOFT_WATCHDOG_ENABLED; #endif int __read_mostly nmi_watchdog_enabled; int __read_mostly soft_watchdog_enabled; int __read_mostly watchdog_user_enabled; |
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int __read_mostly watchdog_thresh = 10; |
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#ifdef CONFIG_SMP int __read_mostly sysctl_softlockup_all_cpu_backtrace; #else #define sysctl_softlockup_all_cpu_backtrace 0 #endif |
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static int __read_mostly watchdog_running; |
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static u64 __read_mostly sample_period; |
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static DEFINE_PER_CPU(unsigned long, watchdog_touch_ts); static DEFINE_PER_CPU(struct task_struct *, softlockup_watchdog); static DEFINE_PER_CPU(struct hrtimer, watchdog_hrtimer); static DEFINE_PER_CPU(bool, softlockup_touch_sync); |
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static DEFINE_PER_CPU(bool, soft_watchdog_warn); |
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static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts); static DEFINE_PER_CPU(unsigned long, soft_lockup_hrtimer_cnt); |
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static DEFINE_PER_CPU(struct task_struct *, softlockup_task_ptr_saved); |
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#ifdef CONFIG_HARDLOCKUP_DETECTOR |
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static DEFINE_PER_CPU(bool, hard_watchdog_warn); static DEFINE_PER_CPU(bool, watchdog_nmi_touch); |
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static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved); |
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#endif #ifdef CONFIG_HARDLOCKUP_DETECTOR_OTHER_CPU static cpumask_t __read_mostly watchdog_cpus; #endif #ifdef CONFIG_HARDLOCKUP_DETECTOR_NMI |
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static DEFINE_PER_CPU(struct perf_event *, watchdog_ev); #endif |
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static unsigned long soft_lockup_nmi_warn; |
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/* boot commands */ /* * Should we panic when a soft-lockup or hard-lockup occurs: */ |
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#ifdef CONFIG_HARDLOCKUP_DETECTOR |
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static int hardlockup_panic = CONFIG_BOOTPARAM_HARDLOCKUP_PANIC_VALUE; |
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/* * We may not want to enable hard lockup detection by default in all cases, * for example when running the kernel as a guest on a hypervisor. In these * cases this function can be called to disable hard lockup detection. This * function should only be executed once by the boot processor before the * kernel command line parameters are parsed, because otherwise it is not * possible to override this in hardlockup_panic_setup(). */ |
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void hardlockup_detector_disable(void) |
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{ |
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watchdog_enabled &= ~NMI_WATCHDOG_ENABLED; |
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} |
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static int __init hardlockup_panic_setup(char *str) { if (!strncmp(str, "panic", 5)) hardlockup_panic = 1; |
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else if (!strncmp(str, "nopanic", 7)) hardlockup_panic = 0; |
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else if (!strncmp(str, "0", 1)) |
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watchdog_enabled &= ~NMI_WATCHDOG_ENABLED; else if (!strncmp(str, "1", 1)) watchdog_enabled |= NMI_WATCHDOG_ENABLED; |
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return 1; } __setup("nmi_watchdog=", hardlockup_panic_setup); #endif unsigned int __read_mostly softlockup_panic = CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE; static int __init softlockup_panic_setup(char *str) { softlockup_panic = simple_strtoul(str, NULL, 0); return 1; } __setup("softlockup_panic=", softlockup_panic_setup); static int __init nowatchdog_setup(char *str) { |
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watchdog_enabled = 0; |
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return 1; } __setup("nowatchdog", nowatchdog_setup); |
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static int __init nosoftlockup_setup(char *str) { |
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watchdog_enabled &= ~SOFT_WATCHDOG_ENABLED; |
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return 1; } __setup("nosoftlockup", nosoftlockup_setup); |
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#ifdef CONFIG_SMP static int __init softlockup_all_cpu_backtrace_setup(char *str) { sysctl_softlockup_all_cpu_backtrace = !!simple_strtol(str, NULL, 0); return 1; } __setup("softlockup_all_cpu_backtrace=", softlockup_all_cpu_backtrace_setup); #endif |
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/* * Hard-lockup warnings should be triggered after just a few seconds. Soft- * lockups can have false positives under extreme conditions. So we generally * want a higher threshold for soft lockups than for hard lockups. So we couple * the thresholds with a factor: we make the soft threshold twice the amount of * time the hard threshold is. */ |
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static int get_softlockup_thresh(void) |
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{ return watchdog_thresh * 2; } |
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/* * Returns seconds, approximately. We don't need nanosecond * resolution, and we don't need to waste time with a big divide when * 2^30ns == 1.074s. */ |
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static unsigned long get_timestamp(void) |
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{ |
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return running_clock() >> 30LL; /* 2^30 ~= 10^9 */ |
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} |
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static void set_sample_period(void) |
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{ /* |
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* convert watchdog_thresh from seconds to ns |
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* the divide by 5 is to give hrtimer several chances (two * or three with the current relation between the soft * and hard thresholds) to increment before the * hardlockup detector generates a warning |
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*/ |
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sample_period = get_softlockup_thresh() * ((u64)NSEC_PER_SEC / 5); |
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} /* Commands for resetting the watchdog */ static void __touch_watchdog(void) { |
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__this_cpu_write(watchdog_touch_ts, get_timestamp()); |
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} |
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void touch_softlockup_watchdog(void) |
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{ |
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/* * Preemption can be enabled. It doesn't matter which CPU's timestamp * gets zeroed here, so use the raw_ operation. */ raw_cpu_write(watchdog_touch_ts, 0); |
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} |
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EXPORT_SYMBOL(touch_softlockup_watchdog); |
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void touch_all_softlockup_watchdogs(void) |
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{ int cpu; /* * this is done lockless * do we care if a 0 races with a timestamp? * all it means is the softlock check starts one cycle later */ for_each_online_cpu(cpu) per_cpu(watchdog_touch_ts, cpu) = 0; } |
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#ifdef CONFIG_HARDLOCKUP_DETECTOR |
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void touch_nmi_watchdog(void) { |
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/* * Using __raw here because some code paths have * preemption enabled. If preemption is enabled * then interrupts should be enabled too, in which * case we shouldn't have to worry about the watchdog * going off. */ |
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raw_cpu_write(watchdog_nmi_touch, true); |
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touch_softlockup_watchdog(); |
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} EXPORT_SYMBOL(touch_nmi_watchdog); |
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#endif |
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void touch_softlockup_watchdog_sync(void) { |
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__this_cpu_write(softlockup_touch_sync, true); __this_cpu_write(watchdog_touch_ts, 0); |
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} |
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#ifdef CONFIG_HARDLOCKUP_DETECTOR_NMI |
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/* watchdog detector functions */ |
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static int is_hardlockup(void) |
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{ |
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unsigned long hrint = __this_cpu_read(hrtimer_interrupts); |
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if (__this_cpu_read(hrtimer_interrupts_saved) == hrint) |
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return 1; |
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__this_cpu_write(hrtimer_interrupts_saved, hrint); |
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return 0; } #endif |
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#ifdef CONFIG_HARDLOCKUP_DETECTOR_OTHER_CPU static unsigned int watchdog_next_cpu(unsigned int cpu) { cpumask_t cpus = watchdog_cpus; unsigned int next_cpu; next_cpu = cpumask_next(cpu, &cpus); if (next_cpu >= nr_cpu_ids) next_cpu = cpumask_first(&cpus); if (next_cpu == cpu) return nr_cpu_ids; return next_cpu; } static int is_hardlockup_other_cpu(unsigned int cpu) { unsigned long hrint = per_cpu(hrtimer_interrupts, cpu); if (per_cpu(hrtimer_interrupts_saved, cpu) == hrint) return 1; per_cpu(hrtimer_interrupts_saved, cpu) = hrint; return 0; } static void watchdog_check_hardlockup_other_cpu(void) { unsigned int next_cpu; /* * Test for hardlockups every 3 samples. The sample period is * watchdog_thresh * 2 / 5, so 3 samples gets us back to slightly over * watchdog_thresh (over by 20%). */ if (__this_cpu_read(hrtimer_interrupts) % 3 != 0) return; /* check for a hardlockup on the next cpu */ next_cpu = watchdog_next_cpu(smp_processor_id()); if (next_cpu >= nr_cpu_ids) return; smp_rmb(); if (per_cpu(watchdog_nmi_touch, next_cpu) == true) { per_cpu(watchdog_nmi_touch, next_cpu) = false; return; } if (is_hardlockup_other_cpu(next_cpu)) { /* only warn once */ if (per_cpu(hard_watchdog_warn, next_cpu) == true) return; if (hardlockup_panic) panic("Watchdog detected hard LOCKUP on cpu %u", next_cpu); else WARN(1, "Watchdog detected hard LOCKUP on cpu %u", next_cpu); per_cpu(hard_watchdog_warn, next_cpu) = true; } else { per_cpu(hard_watchdog_warn, next_cpu) = false; } } #else static inline void watchdog_check_hardlockup_other_cpu(void) { return; } #endif |
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static int is_softlockup(unsigned long touch_ts) |
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{ |
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unsigned long now = get_timestamp(); |
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if (watchdog_enabled & SOFT_WATCHDOG_ENABLED) { /* Warn about unreasonable delays. */ if (time_after(now, touch_ts + get_softlockup_thresh())) return now - touch_ts; } |
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return 0; } |
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#ifdef CONFIG_HARDLOCKUP_DETECTOR_NMI |
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static struct perf_event_attr wd_hw_attr = { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES, .size = sizeof(struct perf_event_attr), .pinned = 1, .disabled = 1, }; /* Callback function for perf event subsystem */ |
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static void watchdog_overflow_callback(struct perf_event *event, |
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struct perf_sample_data *data, struct pt_regs *regs) { |
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/* Ensure the watchdog never gets throttled */ event->hw.interrupts = 0; |
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if (__this_cpu_read(watchdog_nmi_touch) == true) { __this_cpu_write(watchdog_nmi_touch, false); |
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return; } /* check for a hardlockup * This is done by making sure our timer interrupt * is incrementing. The timer interrupt should have * fired multiple times before we overflow'd. If it hasn't * then this is a good indication the cpu is stuck */ |
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if (is_hardlockup()) { int this_cpu = smp_processor_id(); |
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/* only print hardlockups once */ |
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if (__this_cpu_read(hard_watchdog_warn) == true) |
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return; if (hardlockup_panic) |
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panic("Watchdog detected hard LOCKUP on cpu %d", this_cpu); |
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else |
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WARN(1, "Watchdog detected hard LOCKUP on cpu %d", this_cpu); |
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__this_cpu_write(hard_watchdog_warn, true); |
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return; } |
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__this_cpu_write(hard_watchdog_warn, false); |
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return; } |
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#endif /* CONFIG_HARDLOCKUP_DETECTOR_NMI */ |
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static void watchdog_interrupt_count(void) { |
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__this_cpu_inc(hrtimer_interrupts); |
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} |
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static int watchdog_nmi_enable(unsigned int cpu); static void watchdog_nmi_disable(unsigned int cpu); |
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/* watchdog kicker functions */ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer) { |
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unsigned long touch_ts = __this_cpu_read(watchdog_touch_ts); |
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struct pt_regs *regs = get_irq_regs(); int duration; |
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int softlockup_all_cpu_backtrace = sysctl_softlockup_all_cpu_backtrace; |
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/* kick the hardlockup detector */ watchdog_interrupt_count(); |
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/* test for hardlockups on the next cpu */ watchdog_check_hardlockup_other_cpu(); |
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/* kick the softlockup detector */ |
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wake_up_process(__this_cpu_read(softlockup_watchdog)); |
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/* .. and repeat */ |
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hrtimer_forward_now(hrtimer, ns_to_ktime(sample_period)); |
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if (touch_ts == 0) { |
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if (unlikely(__this_cpu_read(softlockup_touch_sync))) { |
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/* * If the time stamp was touched atomically * make sure the scheduler tick is up to date. */ |
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__this_cpu_write(softlockup_touch_sync, false); |
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sched_clock_tick(); } |
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/* Clear the guest paused flag on watchdog reset */ kvm_check_and_clear_guest_paused(); |
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__touch_watchdog(); return HRTIMER_RESTART; } /* check for a softlockup * This is done by making sure a high priority task is * being scheduled. The task touches the watchdog to * indicate it is getting cpu time. If it hasn't then * this is a good indication some task is hogging the cpu */ |
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duration = is_softlockup(touch_ts); |
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if (unlikely(duration)) { |
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/* * If a virtual machine is stopped by the host it can look to * the watchdog like a soft lockup, check to see if the host * stopped the vm before we issue the warning */ if (kvm_check_and_clear_guest_paused()) return HRTIMER_RESTART; |
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/* only warn once */ |
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if (__this_cpu_read(soft_watchdog_warn) == true) { /* * When multiple processes are causing softlockups the * softlockup detector only warns on the first one * because the code relies on a full quiet cycle to * re-arm. The second process prevents the quiet cycle * and never gets reported. Use task pointers to detect * this. */ if (__this_cpu_read(softlockup_task_ptr_saved) != current) { __this_cpu_write(soft_watchdog_warn, false); __touch_watchdog(); } |
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return HRTIMER_RESTART; |
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} |
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if (softlockup_all_cpu_backtrace) { /* Prevent multiple soft-lockup reports if one cpu is already * engaged in dumping cpu back traces */ if (test_and_set_bit(0, &soft_lockup_nmi_warn)) { /* Someone else will report us. Let's give up */ __this_cpu_write(soft_watchdog_warn, true); return HRTIMER_RESTART; } } |
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pr_emerg("BUG: soft lockup - CPU#%d stuck for %us! [%s:%d] ", |
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smp_processor_id(), duration, |
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current->comm, task_pid_nr(current)); |
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__this_cpu_write(softlockup_task_ptr_saved, current); |
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print_modules(); print_irqtrace_events(current); if (regs) show_regs(regs); else dump_stack(); |
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if (softlockup_all_cpu_backtrace) { /* Avoid generating two back traces for current * given that one is already made above */ trigger_allbutself_cpu_backtrace(); clear_bit(0, &soft_lockup_nmi_warn); /* Barrier to sync with other cpus */ smp_mb__after_atomic(); } |
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add_taint(TAINT_SOFTLOCKUP, LOCKDEP_STILL_OK); |
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if (softlockup_panic) panic("softlockup: hung tasks"); |
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__this_cpu_write(soft_watchdog_warn, true); |
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} else |
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__this_cpu_write(soft_watchdog_warn, false); |
58687acba lockup_detector: ... |
481 482 483 |
return HRTIMER_RESTART; } |
bcd951cf1 watchdog: Use hot... |
484 485 486 |
static void watchdog_set_prio(unsigned int policy, unsigned int prio) { struct sched_param param = { .sched_priority = prio }; |
58687acba lockup_detector: ... |
487 |
|
bcd951cf1 watchdog: Use hot... |
488 489 490 491 |
sched_setscheduler(current, policy, ¶m); } static void watchdog_enable(unsigned int cpu) |
58687acba lockup_detector: ... |
492 |
{ |
f7f66b05a watchdog: Replace... |
493 |
struct hrtimer *hrtimer = raw_cpu_ptr(&watchdog_hrtimer); |
58687acba lockup_detector: ... |
494 |
|
3935e8950 watchdog: Fix dis... |
495 496 497 |
/* kick off the timer for the hardlockup detector */ hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); hrtimer->function = watchdog_timer_fn; |
bcd951cf1 watchdog: Use hot... |
498 499 |
/* Enable the perf event */ watchdog_nmi_enable(cpu); |
58687acba lockup_detector: ... |
500 |
|
58687acba lockup_detector: ... |
501 |
/* done here because hrtimer_start can only pin to smp_processor_id() */ |
0f34c4009 watchdog: store t... |
502 |
hrtimer_start(hrtimer, ns_to_ktime(sample_period), |
58687acba lockup_detector: ... |
503 |
HRTIMER_MODE_REL_PINNED); |
bcd951cf1 watchdog: Use hot... |
504 505 506 507 |
/* initialize timestamp */ watchdog_set_prio(SCHED_FIFO, MAX_RT_PRIO - 1); __touch_watchdog(); } |
58687acba lockup_detector: ... |
508 |
|
bcd951cf1 watchdog: Use hot... |
509 510 |
static void watchdog_disable(unsigned int cpu) { |
f7f66b05a watchdog: Replace... |
511 |
struct hrtimer *hrtimer = raw_cpu_ptr(&watchdog_hrtimer); |
58687acba lockup_detector: ... |
512 |
|
bcd951cf1 watchdog: Use hot... |
513 514 515 516 |
watchdog_set_prio(SCHED_NORMAL, 0); hrtimer_cancel(hrtimer); /* disable the perf event */ watchdog_nmi_disable(cpu); |
58687acba lockup_detector: ... |
517 |
} |
b8900bc02 watchdog: Registe... |
518 519 520 521 |
static void watchdog_cleanup(unsigned int cpu, bool online) { watchdog_disable(cpu); } |
bcd951cf1 watchdog: Use hot... |
522 523 524 525 526 527 528 529 530 |
static int watchdog_should_run(unsigned int cpu) { return __this_cpu_read(hrtimer_interrupts) != __this_cpu_read(soft_lockup_hrtimer_cnt); } /* * The watchdog thread function - touches the timestamp. * |
0f34c4009 watchdog: store t... |
531 |
* It only runs once every sample_period seconds (4 seconds by |
bcd951cf1 watchdog: Use hot... |
532 533 534 535 536 537 538 539 540 |
* default) to reset the softlockup timestamp. If this gets delayed * for more than 2*watchdog_thresh seconds then the debug-printout * triggers in watchdog_timer_fn(). */ static void watchdog(unsigned int cpu) { __this_cpu_write(soft_lockup_hrtimer_cnt, __this_cpu_read(hrtimer_interrupts)); __touch_watchdog(); |
bcfba4f4b watchdog: impleme... |
541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 |
/* * watchdog_nmi_enable() clears the NMI_WATCHDOG_ENABLED bit in the * failure path. Check for failures that can occur asynchronously - * for example, when CPUs are on-lined - and shut down the hardware * perf event on each CPU accordingly. * * The only non-obvious place this bit can be cleared is through * watchdog_nmi_enable(), so a pr_info() is placed there. Placing a * pr_info here would be too noisy as it would result in a message * every few seconds if the hardlockup was disabled but the softlockup * enabled. */ if (!(watchdog_enabled & NMI_WATCHDOG_ENABLED)) watchdog_nmi_disable(cpu); |
bcd951cf1 watchdog: Use hot... |
556 |
} |
58687acba lockup_detector: ... |
557 |
|
942008b35 hardlockup: detec... |
558 |
#ifdef CONFIG_HARDLOCKUP_DETECTOR_NMI |
a70270468 watchdog: Quiet d... |
559 560 561 562 563 564 |
/* * People like the simple clean cpu node info on boot. * Reduce the watchdog noise by only printing messages * that are different from what cpu0 displayed. */ static unsigned long cpu0_err; |
bcd951cf1 watchdog: Use hot... |
565 |
static int watchdog_nmi_enable(unsigned int cpu) |
58687acba lockup_detector: ... |
566 567 568 |
{ struct perf_event_attr *wd_attr; struct perf_event *event = per_cpu(watchdog_ev, cpu); |
195daf665 watchdog: enable ... |
569 570 571 |
/* nothing to do if the hard lockup detector is disabled */ if (!(watchdog_enabled & NMI_WATCHDOG_ENABLED)) goto out; |
6e7458a6f kernel/watchdog.c... |
572 |
|
58687acba lockup_detector: ... |
573 574 575 576 577 578 579 |
/* is it already setup and enabled? */ if (event && event->state > PERF_EVENT_STATE_OFF) goto out; /* it is setup but not enabled */ if (event != NULL) goto out_enable; |
58687acba lockup_detector: ... |
580 |
wd_attr = &wd_hw_attr; |
4eec42f39 watchdog: Change ... |
581 |
wd_attr->sample_period = hw_nmi_get_sample_period(watchdog_thresh); |
1880c4ae1 perf, x86: Add hw... |
582 583 |
/* Try to register using hardware perf events */ |
4dc0da869 perf: Add context... |
584 |
event = perf_event_create_kernel_counter(wd_attr, cpu, NULL, watchdog_overflow_callback, NULL); |
a70270468 watchdog: Quiet d... |
585 586 587 588 |
/* save cpu0 error for future comparision */ if (cpu == 0 && IS_ERR(event)) cpu0_err = PTR_ERR(event); |
58687acba lockup_detector: ... |
589 |
if (!IS_ERR(event)) { |
a70270468 watchdog: Quiet d... |
590 591 592 593 |
/* only print for cpu0 or different than cpu0 */ if (cpu == 0 || cpu0_err) pr_info("enabled on all CPUs, permanently consumes one hw-PMU counter. "); |
58687acba lockup_detector: ... |
594 595 |
goto out_save; } |
bcfba4f4b watchdog: impleme... |
596 597 598 599 600 601 602 603 604 605 606 |
/* * Disable the hard lockup detector if _any_ CPU fails to set up * set up the hardware perf event. The watchdog() function checks * the NMI_WATCHDOG_ENABLED bit periodically. * * The barriers are for syncing up watchdog_enabled across all the * cpus, as clear_bit() does not use barriers. */ smp_mb__before_atomic(); clear_bit(NMI_WATCHDOG_ENABLED_BIT, &watchdog_enabled); smp_mb__after_atomic(); |
a70270468 watchdog: Quiet d... |
607 608 609 |
/* skip displaying the same error again */ if (cpu > 0 && (PTR_ERR(event) == cpu0_err)) return PTR_ERR(event); |
5651f7f47 watchdog, nmi: Lo... |
610 611 612 |
/* vary the KERN level based on the returned errno */ if (PTR_ERR(event) == -EOPNOTSUPP) |
4501980aa kernel/watchdog.c... |
613 614 |
pr_info("disabled (cpu%i): not supported (no LAPIC?) ", cpu); |
5651f7f47 watchdog, nmi: Lo... |
615 |
else if (PTR_ERR(event) == -ENOENT) |
656c3b79f kernel/watchdog.c... |
616 617 |
pr_warn("disabled (cpu%i): hardware events not enabled ", |
4501980aa kernel/watchdog.c... |
618 |
cpu); |
5651f7f47 watchdog, nmi: Lo... |
619 |
else |
4501980aa kernel/watchdog.c... |
620 621 622 |
pr_err("disabled (cpu%i): unable to create perf event: %ld ", cpu, PTR_ERR(event)); |
bcfba4f4b watchdog: impleme... |
623 624 625 |
pr_info("Shutting down hard lockup detector on all cpus "); |
eac243355 lockup_detector: ... |
626 |
return PTR_ERR(event); |
58687acba lockup_detector: ... |
627 628 629 630 631 632 633 634 635 |
/* success path */ out_save: per_cpu(watchdog_ev, cpu) = event; out_enable: perf_event_enable(per_cpu(watchdog_ev, cpu)); out: return 0; } |
bcd951cf1 watchdog: Use hot... |
636 |
static void watchdog_nmi_disable(unsigned int cpu) |
58687acba lockup_detector: ... |
637 638 639 640 641 642 643 644 645 646 |
{ struct perf_event *event = per_cpu(watchdog_ev, cpu); if (event) { perf_event_disable(event); per_cpu(watchdog_ev, cpu) = NULL; /* should be in cleanup, but blocks oprofile */ perf_event_release_kernel(event); } |
df5771495 watchdog: Fix pri... |
647 648 649 650 |
if (cpu == 0) { /* watchdog_nmi_enable() expects this to be zero initially. */ cpu0_err = 0; } |
58687acba lockup_detector: ... |
651 |
} |
b3738d293 watchdog: Add wat... |
652 653 654 655 |
void watchdog_nmi_enable_all(void) { int cpu; |
ab992dc38 watchdog: Fix mer... |
656 657 658 659 |
mutex_lock(&watchdog_proc_mutex); if (!(watchdog_enabled & NMI_WATCHDOG_ENABLED)) goto unlock; |
b3738d293 watchdog: Add wat... |
660 661 662 663 664 |
get_online_cpus(); for_each_online_cpu(cpu) watchdog_nmi_enable(cpu); put_online_cpus(); |
ab992dc38 watchdog: Fix mer... |
665 666 |
unlock: |
1173ff09b watchdog: fix dou... |
667 |
mutex_unlock(&watchdog_proc_mutex); |
b3738d293 watchdog: Add wat... |
668 669 670 671 672 |
} void watchdog_nmi_disable_all(void) { int cpu; |
ab992dc38 watchdog: Fix mer... |
673 |
mutex_lock(&watchdog_proc_mutex); |
b3738d293 watchdog: Add wat... |
674 |
if (!watchdog_running) |
ab992dc38 watchdog: Fix mer... |
675 |
goto unlock; |
b3738d293 watchdog: Add wat... |
676 677 678 679 680 |
get_online_cpus(); for_each_online_cpu(cpu) watchdog_nmi_disable(cpu); put_online_cpus(); |
ab992dc38 watchdog: Fix mer... |
681 682 683 |
unlock: mutex_unlock(&watchdog_proc_mutex); |
b3738d293 watchdog: Add wat... |
684 |
} |
58687acba lockup_detector: ... |
685 |
#else |
942008b35 hardlockup: detec... |
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 |
#ifdef CONFIG_HARDLOCKUP_DETECTOR_OTHER_CPU static int watchdog_nmi_enable(unsigned int cpu) { /* * The new cpu will be marked online before the first hrtimer interrupt * runs on it. If another cpu tests for a hardlockup on the new cpu * before it has run its first hrtimer, it will get a false positive. * Touch the watchdog on the new cpu to delay the first check for at * least 3 sampling periods to guarantee one hrtimer has run on the new * cpu. */ per_cpu(watchdog_nmi_touch, cpu) = true; smp_wmb(); cpumask_set_cpu(cpu, &watchdog_cpus); return 0; } static void watchdog_nmi_disable(unsigned int cpu) { unsigned int next_cpu = watchdog_next_cpu(cpu); /* * Offlining this cpu will cause the cpu before this one to start * checking the one after this one. If this cpu just finished checking * the next cpu and updating hrtimer_interrupts_saved, and then the * previous cpu checks it within one sample period, it will trigger a * false positive. Touch the watchdog on the next cpu to prevent it. */ if (next_cpu < nr_cpu_ids) per_cpu(watchdog_nmi_touch, next_cpu) = true; smp_wmb(); cpumask_clear_cpu(cpu, &watchdog_cpus); } #else |
bcd951cf1 watchdog: Use hot... |
720 721 |
static int watchdog_nmi_enable(unsigned int cpu) { return 0; } static void watchdog_nmi_disable(unsigned int cpu) { return; } |
b3738d293 watchdog: Add wat... |
722 723 |
void watchdog_nmi_enable_all(void) {} void watchdog_nmi_disable_all(void) {} |
942008b35 hardlockup: detec... |
724 725 |
#endif /* CONFIG_HARDLOCKUP_DETECTOR_OTHER_CPU */ #endif /* CONFIG_HARDLOCKUP_DETECTOR_NMI */ |
58687acba lockup_detector: ... |
726 |
|
b8900bc02 watchdog: Registe... |
727 728 729 730 731 732 733 734 735 736 |
static struct smp_hotplug_thread watchdog_threads = { .store = &softlockup_watchdog, .thread_should_run = watchdog_should_run, .thread_fn = watchdog, .thread_comm = "watchdog/%u", .setup = watchdog_enable, .cleanup = watchdog_cleanup, .park = watchdog_disable, .unpark = watchdog_enable, }; |
9809b18fc watchdog: update ... |
737 738 |
static void restart_watchdog_hrtimer(void *info) { |
f7f66b05a watchdog: Replace... |
739 |
struct hrtimer *hrtimer = raw_cpu_ptr(&watchdog_hrtimer); |
9809b18fc watchdog: update ... |
740 741 742 743 744 745 746 747 748 749 750 751 752 |
int ret; /* * No need to cancel and restart hrtimer if it is currently executing * because it will reprogram itself with the new period now. * We should never see it unqueued here because we are running per-cpu * with interrupts disabled. */ ret = hrtimer_try_to_cancel(hrtimer); if (ret == 1) hrtimer_start(hrtimer, ns_to_ktime(sample_period), HRTIMER_MODE_REL_PINNED); } |
b2f57c3a0 watchdog: clean u... |
753 |
static void update_watchdog(int cpu) |
9809b18fc watchdog: update ... |
754 |
{ |
9809b18fc watchdog: update ... |
755 756 757 758 759 760 761 762 763 |
/* * Make sure that perf event counter will adopt to a new * sampling period. Updating the sampling period directly would * be much nicer but we do not have an API for that now so * let's use a big hammer. * Hrtimer will adopt the new period on the next tick but this * might be late already so we have to restart the timer as well. */ watchdog_nmi_disable(cpu); |
e0a23b062 watchdog: Simplif... |
764 |
smp_call_function_single(cpu, restart_watchdog_hrtimer, NULL, 1); |
9809b18fc watchdog: update ... |
765 766 |
watchdog_nmi_enable(cpu); } |
b2f57c3a0 watchdog: clean u... |
767 |
static void update_watchdog_all_cpus(void) |
9809b18fc watchdog: update ... |
768 769 770 771 |
{ int cpu; get_online_cpus(); |
9809b18fc watchdog: update ... |
772 |
for_each_online_cpu(cpu) |
b2f57c3a0 watchdog: clean u... |
773 |
update_watchdog(cpu); |
9809b18fc watchdog: update ... |
774 775 |
put_online_cpus(); } |
b2f57c3a0 watchdog: clean u... |
776 |
static int watchdog_enable_all_cpus(void) |
58687acba lockup_detector: ... |
777 |
{ |
b8900bc02 watchdog: Registe... |
778 |
int err = 0; |
58687acba lockup_detector: ... |
779 |
|
3c00ea82c watchdog: Rename ... |
780 |
if (!watchdog_running) { |
b8900bc02 watchdog: Registe... |
781 782 783 784 785 |
err = smpboot_register_percpu_thread(&watchdog_threads); if (err) pr_err("Failed to create watchdog threads, disabled "); else |
3c00ea82c watchdog: Rename ... |
786 |
watchdog_running = 1; |
b2f57c3a0 watchdog: clean u... |
787 788 789 790 791 792 |
} else { /* * Enable/disable the lockup detectors or * change the sample period 'on the fly'. */ update_watchdog_all_cpus(); |
bcd951cf1 watchdog: Use hot... |
793 |
} |
b8900bc02 watchdog: Registe... |
794 795 |
return err; |
58687acba lockup_detector: ... |
796 |
} |
b8900bc02 watchdog: Registe... |
797 798 799 |
/* prepare/enable/disable routines */ /* sysctl functions */ #ifdef CONFIG_SYSCTL |
58687acba lockup_detector: ... |
800 801 |
static void watchdog_disable_all_cpus(void) { |
3c00ea82c watchdog: Rename ... |
802 803 |
if (watchdog_running) { watchdog_running = 0; |
b8900bc02 watchdog: Registe... |
804 |
smpboot_unregister_percpu_thread(&watchdog_threads); |
bcd951cf1 watchdog: Use hot... |
805 |
} |
58687acba lockup_detector: ... |
806 |
} |
58687acba lockup_detector: ... |
807 |
/* |
a0c9cbb93 watchdog: introdu... |
808 809 810 811 812 813 814 815 816 817 818 819 820 821 |
* Update the run state of the lockup detectors. */ static int proc_watchdog_update(void) { int err = 0; /* * Watchdog threads won't be started if they are already active. * The 'watchdog_running' variable in watchdog_*_all_cpus() takes * care of this. If those threads are already active, the sample * period will be updated and the lockup detectors will be enabled * or disabled 'on the fly'. */ if (watchdog_enabled && watchdog_thresh) |
b2f57c3a0 watchdog: clean u... |
822 |
err = watchdog_enable_all_cpus(); |
a0c9cbb93 watchdog: introdu... |
823 824 825 826 827 828 829 830 |
else watchdog_disable_all_cpus(); return err; } /* |
ef246a216 watchdog: introdu... |
831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 |
* common function for watchdog, nmi_watchdog and soft_watchdog parameter * * caller | table->data points to | 'which' contains the flag(s) * -------------------|-----------------------|----------------------------- * proc_watchdog | watchdog_user_enabled | NMI_WATCHDOG_ENABLED or'ed * | | with SOFT_WATCHDOG_ENABLED * -------------------|-----------------------|----------------------------- * proc_nmi_watchdog | nmi_watchdog_enabled | NMI_WATCHDOG_ENABLED * -------------------|-----------------------|----------------------------- * proc_soft_watchdog | soft_watchdog_enabled | SOFT_WATCHDOG_ENABLED */ static int proc_watchdog_common(int which, struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { int err, old, new; int *watchdog_param = (int *)table->data; mutex_lock(&watchdog_proc_mutex); /* * If the parameter is being read return the state of the corresponding * bit(s) in 'watchdog_enabled', else update 'watchdog_enabled' and the * run state of the lockup detectors. */ if (!write) { *watchdog_param = (watchdog_enabled & which) != 0; err = proc_dointvec_minmax(table, write, buffer, lenp, ppos); } else { err = proc_dointvec_minmax(table, write, buffer, lenp, ppos); if (err) goto out; /* * There is a race window between fetching the current value * from 'watchdog_enabled' and storing the new value. During * this race window, watchdog_nmi_enable() can sneak in and * clear the NMI_WATCHDOG_ENABLED bit in 'watchdog_enabled'. * The 'cmpxchg' detects this race and the loop retries. */ do { old = watchdog_enabled; /* * If the parameter value is not zero set the * corresponding bit(s), else clear it(them). */ if (*watchdog_param) new = old | which; else new = old & ~which; } while (cmpxchg(&watchdog_enabled, old, new) != old); /* * Update the run state of the lockup detectors. * Restore 'watchdog_enabled' on failure. */ err = proc_watchdog_update(); if (err) watchdog_enabled = old; } out: mutex_unlock(&watchdog_proc_mutex); return err; } /* |
83a80a390 watchdog: introdu... |
896 897 898 899 900 901 902 903 904 905 906 |
* /proc/sys/kernel/watchdog */ int proc_watchdog(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { return proc_watchdog_common(NMI_WATCHDOG_ENABLED|SOFT_WATCHDOG_ENABLED, table, write, buffer, lenp, ppos); } /* * /proc/sys/kernel/nmi_watchdog |
58687acba lockup_detector: ... |
907 |
*/ |
83a80a390 watchdog: introdu... |
908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 |
int proc_nmi_watchdog(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { return proc_watchdog_common(NMI_WATCHDOG_ENABLED, table, write, buffer, lenp, ppos); } /* * /proc/sys/kernel/soft_watchdog */ int proc_soft_watchdog(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { return proc_watchdog_common(SOFT_WATCHDOG_ENABLED, table, write, buffer, lenp, ppos); } |
58687acba lockup_detector: ... |
924 |
|
83a80a390 watchdog: introdu... |
925 926 927 928 929 |
/* * /proc/sys/kernel/watchdog_thresh */ int proc_watchdog_thresh(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
58687acba lockup_detector: ... |
930 |
{ |
83a80a390 watchdog: introdu... |
931 |
int err, old; |
58687acba lockup_detector: ... |
932 |
|
359e6fab6 watchdog: update ... |
933 |
mutex_lock(&watchdog_proc_mutex); |
bcd951cf1 watchdog: Use hot... |
934 |
|
83a80a390 watchdog: introdu... |
935 |
old = ACCESS_ONCE(watchdog_thresh); |
b8900bc02 watchdog: Registe... |
936 |
err = proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
83a80a390 watchdog: introdu... |
937 |
|
b8900bc02 watchdog: Registe... |
938 |
if (err || !write) |
359e6fab6 watchdog: update ... |
939 |
goto out; |
e04ab2bc4 watchdog: Only di... |
940 |
|
b66a2356d watchdog: Add com... |
941 |
/* |
83a80a390 watchdog: introdu... |
942 943 |
* Update the sample period. * Restore 'watchdog_thresh' on failure. |
b66a2356d watchdog: Add com... |
944 |
*/ |
83a80a390 watchdog: introdu... |
945 946 947 948 |
set_sample_period(); err = proc_watchdog_update(); if (err) watchdog_thresh = old; |
359e6fab6 watchdog: update ... |
949 950 |
out: mutex_unlock(&watchdog_proc_mutex); |
b8900bc02 watchdog: Registe... |
951 |
return err; |
58687acba lockup_detector: ... |
952 |
} |
58687acba lockup_detector: ... |
953 |
#endif /* CONFIG_SYSCTL */ |
004417a6d perf, arch: Clean... |
954 |
void __init lockup_detector_init(void) |
58687acba lockup_detector: ... |
955 |
{ |
0f34c4009 watchdog: store t... |
956 |
set_sample_period(); |
b8900bc02 watchdog: Registe... |
957 |
|
195daf665 watchdog: enable ... |
958 |
if (watchdog_enabled) |
b2f57c3a0 watchdog: clean u... |
959 |
watchdog_enable_all_cpus(); |
58687acba lockup_detector: ... |
960 |
} |