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lockup_detector: Remove nmi_watchdog.c file
This file migrated to kernel/watchdog.c and then combined with kernel/softlockup.c. As a result kernel/nmi_watchdog.c is no longer needed. Just remove it. Signed-off-by: Don Zickus <dzickus@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Eric Paris <eparis@redhat.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> LKML-Reference: <1273266711-18706-5-git-send-email-dzickus@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Don Zickus
Frederic Weisbecker
parent
2508ce1845
commit
f69bcf60c3
1 changed files with 0 additions and 259 deletions
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@ -1,259 +0,0 @@
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/*
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* Detect Hard Lockups using the NMI
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*
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* started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
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*
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* this code detects hard lockups: incidents in where on a CPU
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* the kernel does not respond to anything except NMI.
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*
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* Note: Most of this code is borrowed heavily from softlockup.c,
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* so thanks to Ingo for the initial implementation.
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* Some chunks also taken from arch/x86/kernel/apic/nmi.c, thanks
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* to those contributors as well.
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*/
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#include <linux/mm.h>
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#include <linux/cpu.h>
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#include <linux/nmi.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/freezer.h>
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#include <linux/lockdep.h>
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#include <linux/notifier.h>
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#include <linux/module.h>
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#include <linux/sysctl.h>
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#include <asm/irq_regs.h>
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#include <linux/perf_event.h>
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static DEFINE_PER_CPU(struct perf_event *, nmi_watchdog_ev);
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static DEFINE_PER_CPU(int, nmi_watchdog_touch);
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static DEFINE_PER_CPU(long, alert_counter);
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static int panic_on_timeout;
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void touch_nmi_watchdog(void)
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{
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__raw_get_cpu_var(nmi_watchdog_touch) = 1;
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touch_softlockup_watchdog();
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}
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EXPORT_SYMBOL(touch_nmi_watchdog);
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void touch_all_nmi_watchdog(void)
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{
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int cpu;
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for_each_online_cpu(cpu)
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per_cpu(nmi_watchdog_touch, cpu) = 1;
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touch_softlockup_watchdog();
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}
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static int __init setup_nmi_watchdog(char *str)
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{
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if (!strncmp(str, "panic", 5)) {
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panic_on_timeout = 1;
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str = strchr(str, ',');
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if (!str)
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return 1;
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++str;
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}
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return 1;
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}
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__setup("nmi_watchdog=", setup_nmi_watchdog);
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struct perf_event_attr wd_hw_attr = {
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.type = PERF_TYPE_HARDWARE,
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.config = PERF_COUNT_HW_CPU_CYCLES,
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.size = sizeof(struct perf_event_attr),
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.pinned = 1,
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.disabled = 1,
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};
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struct perf_event_attr wd_sw_attr = {
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.type = PERF_TYPE_SOFTWARE,
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.config = PERF_COUNT_SW_CPU_CLOCK,
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.size = sizeof(struct perf_event_attr),
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.pinned = 1,
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.disabled = 1,
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};
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void wd_overflow(struct perf_event *event, int nmi,
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struct perf_sample_data *data,
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struct pt_regs *regs)
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{
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int cpu = smp_processor_id();
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int touched = 0;
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if (__get_cpu_var(nmi_watchdog_touch)) {
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per_cpu(nmi_watchdog_touch, cpu) = 0;
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touched = 1;
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}
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/* check to see if the cpu is doing anything */
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if (!touched && hw_nmi_is_cpu_stuck(regs)) {
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/*
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* Ayiee, looks like this CPU is stuck ...
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* wait a few IRQs (5 seconds) before doing the oops ...
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*/
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per_cpu(alert_counter, cpu) += 1;
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if (per_cpu(alert_counter, cpu) == 5) {
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if (panic_on_timeout)
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panic("NMI Watchdog detected LOCKUP on cpu %d", cpu);
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else
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WARN(1, "NMI Watchdog detected LOCKUP on cpu %d", cpu);
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}
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} else {
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per_cpu(alert_counter, cpu) = 0;
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}
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return;
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}
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static int enable_nmi_watchdog(int cpu)
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{
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struct perf_event *event;
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struct perf_event_attr *wd_attr;
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event = per_cpu(nmi_watchdog_ev, cpu);
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if (event && event->state > PERF_EVENT_STATE_OFF)
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return 0;
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if (event == NULL) {
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/* Try to register using hardware perf events first */
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wd_attr = &wd_hw_attr;
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wd_attr->sample_period = hw_nmi_get_sample_period();
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event = perf_event_create_kernel_counter(wd_attr, cpu, -1, wd_overflow);
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if (IS_ERR(event)) {
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/* hardware doesn't exist or not supported, fallback to software events */
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printk(KERN_INFO "nmi_watchdog: hardware not available, trying software events\n");
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wd_attr = &wd_sw_attr;
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wd_attr->sample_period = NSEC_PER_SEC;
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event = perf_event_create_kernel_counter(wd_attr, cpu, -1, wd_overflow);
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if (IS_ERR(event)) {
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printk(KERN_ERR "nmi watchdog failed to create perf event on %i: %p\n", cpu, event);
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return -1;
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}
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}
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per_cpu(nmi_watchdog_ev, cpu) = event;
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}
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perf_event_enable(per_cpu(nmi_watchdog_ev, cpu));
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return 0;
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}
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static void disable_nmi_watchdog(int cpu)
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{
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struct perf_event *event;
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event = per_cpu(nmi_watchdog_ev, cpu);
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if (event) {
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perf_event_disable(per_cpu(nmi_watchdog_ev, cpu));
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per_cpu(nmi_watchdog_ev, cpu) = NULL;
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perf_event_release_kernel(event);
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}
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}
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#ifdef CONFIG_SYSCTL
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/*
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* proc handler for /proc/sys/kernel/nmi_watchdog
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*/
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int nmi_watchdog_enabled;
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int proc_nmi_enabled(struct ctl_table *table, int write,
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void __user *buffer, size_t *length, loff_t *ppos)
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{
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int cpu;
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if (!write) {
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struct perf_event *event;
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for_each_online_cpu(cpu) {
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event = per_cpu(nmi_watchdog_ev, cpu);
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if (event && event->state > PERF_EVENT_STATE_OFF) {
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nmi_watchdog_enabled = 1;
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break;
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}
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}
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proc_dointvec(table, write, buffer, length, ppos);
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return 0;
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}
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touch_all_nmi_watchdog();
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proc_dointvec(table, write, buffer, length, ppos);
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if (nmi_watchdog_enabled) {
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for_each_online_cpu(cpu)
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if (enable_nmi_watchdog(cpu)) {
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printk(KERN_ERR "NMI watchdog failed configuration, "
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" can not be enabled\n");
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}
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} else {
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for_each_online_cpu(cpu)
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disable_nmi_watchdog(cpu);
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}
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return 0;
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}
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#endif /* CONFIG_SYSCTL */
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/*
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* Create/destroy watchdog threads as CPUs come and go:
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*/
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static int __cpuinit
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cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
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{
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int hotcpu = (unsigned long)hcpu;
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switch (action) {
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case CPU_UP_PREPARE:
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case CPU_UP_PREPARE_FROZEN:
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per_cpu(nmi_watchdog_touch, hotcpu) = 0;
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break;
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case CPU_ONLINE:
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case CPU_ONLINE_FROZEN:
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if (enable_nmi_watchdog(hotcpu))
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return NOTIFY_BAD;
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break;
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#ifdef CONFIG_HOTPLUG_CPU
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case CPU_UP_CANCELED:
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case CPU_UP_CANCELED_FROZEN:
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disable_nmi_watchdog(hotcpu);
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case CPU_DEAD:
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case CPU_DEAD_FROZEN:
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break;
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#endif /* CONFIG_HOTPLUG_CPU */
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}
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return NOTIFY_OK;
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}
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static struct notifier_block __cpuinitdata cpu_nfb = {
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.notifier_call = cpu_callback
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};
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static int __initdata nonmi_watchdog;
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static int __init nonmi_watchdog_setup(char *str)
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{
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nonmi_watchdog = 1;
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return 1;
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}
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__setup("nonmi_watchdog", nonmi_watchdog_setup);
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static int __init spawn_nmi_watchdog_task(void)
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{
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void *cpu = (void *)(long)smp_processor_id();
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int err;
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if (nonmi_watchdog)
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return 0;
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printk(KERN_INFO "NMI watchdog enabled, takes one hw-pmu counter.\n");
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err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
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if (err == NOTIFY_BAD) {
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BUG();
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return 1;
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}
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cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
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register_cpu_notifier(&cpu_nfb);
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return 0;
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}
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early_initcall(spawn_nmi_watchdog_task);
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