diff --git a/kernel/nmi_watchdog.c b/kernel/nmi_watchdog.c deleted file mode 100644 index a79d211c30df9b457f962310b8e2ad9c842df680..0000000000000000000000000000000000000000 --- a/kernel/nmi_watchdog.c +++ /dev/null @@ -1,259 +0,0 @@ -/* - * Detect Hard Lockups using the NMI - * - * started by Don Zickus, Copyright (C) 2010 Red Hat, Inc. - * - * this code detects hard lockups: incidents in where on a CPU - * the kernel does not respond to anything except NMI. - * - * Note: Most of this code is borrowed heavily from softlockup.c, - * so thanks to Ingo for the initial implementation. - * Some chunks also taken from arch/x86/kernel/apic/nmi.c, thanks - * to those contributors as well. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -static DEFINE_PER_CPU(struct perf_event *, nmi_watchdog_ev); -static DEFINE_PER_CPU(int, nmi_watchdog_touch); -static DEFINE_PER_CPU(long, alert_counter); - -static int panic_on_timeout; - -void touch_nmi_watchdog(void) -{ - __raw_get_cpu_var(nmi_watchdog_touch) = 1; - touch_softlockup_watchdog(); -} -EXPORT_SYMBOL(touch_nmi_watchdog); - -void touch_all_nmi_watchdog(void) -{ - int cpu; - - for_each_online_cpu(cpu) - per_cpu(nmi_watchdog_touch, cpu) = 1; - touch_softlockup_watchdog(); -} - -static int __init setup_nmi_watchdog(char *str) -{ - if (!strncmp(str, "panic", 5)) { - panic_on_timeout = 1; - str = strchr(str, ','); - if (!str) - return 1; - ++str; - } - return 1; -} -__setup("nmi_watchdog=", setup_nmi_watchdog); - -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, -}; - -struct perf_event_attr wd_sw_attr = { - .type = PERF_TYPE_SOFTWARE, - .config = PERF_COUNT_SW_CPU_CLOCK, - .size = sizeof(struct perf_event_attr), - .pinned = 1, - .disabled = 1, -}; - -void wd_overflow(struct perf_event *event, int nmi, - struct perf_sample_data *data, - struct pt_regs *regs) -{ - int cpu = smp_processor_id(); - int touched = 0; - - if (__get_cpu_var(nmi_watchdog_touch)) { - per_cpu(nmi_watchdog_touch, cpu) = 0; - touched = 1; - } - - /* check to see if the cpu is doing anything */ - if (!touched && hw_nmi_is_cpu_stuck(regs)) { - /* - * Ayiee, looks like this CPU is stuck ... - * wait a few IRQs (5 seconds) before doing the oops ... - */ - per_cpu(alert_counter, cpu) += 1; - if (per_cpu(alert_counter, cpu) == 5) { - if (panic_on_timeout) - panic("NMI Watchdog detected LOCKUP on cpu %d", cpu); - else - WARN(1, "NMI Watchdog detected LOCKUP on cpu %d", cpu); - } - } else { - per_cpu(alert_counter, cpu) = 0; - } - - return; -} - -static int enable_nmi_watchdog(int cpu) -{ - struct perf_event *event; - struct perf_event_attr *wd_attr; - - event = per_cpu(nmi_watchdog_ev, cpu); - if (event && event->state > PERF_EVENT_STATE_OFF) - return 0; - - if (event == NULL) { - /* Try to register using hardware perf events first */ - wd_attr = &wd_hw_attr; - wd_attr->sample_period = hw_nmi_get_sample_period(); - event = perf_event_create_kernel_counter(wd_attr, cpu, -1, wd_overflow); - if (IS_ERR(event)) { - /* hardware doesn't exist or not supported, fallback to software events */ - printk(KERN_INFO "nmi_watchdog: hardware not available, trying software events\n"); - wd_attr = &wd_sw_attr; - wd_attr->sample_period = NSEC_PER_SEC; - event = perf_event_create_kernel_counter(wd_attr, cpu, -1, wd_overflow); - if (IS_ERR(event)) { - printk(KERN_ERR "nmi watchdog failed to create perf event on %i: %p\n", cpu, event); - return -1; - } - } - per_cpu(nmi_watchdog_ev, cpu) = event; - } - perf_event_enable(per_cpu(nmi_watchdog_ev, cpu)); - return 0; -} - -static void disable_nmi_watchdog(int cpu) -{ - struct perf_event *event; - - event = per_cpu(nmi_watchdog_ev, cpu); - if (event) { - perf_event_disable(per_cpu(nmi_watchdog_ev, cpu)); - per_cpu(nmi_watchdog_ev, cpu) = NULL; - perf_event_release_kernel(event); - } -} - -#ifdef CONFIG_SYSCTL -/* - * proc handler for /proc/sys/kernel/nmi_watchdog - */ -int nmi_watchdog_enabled; - -int proc_nmi_enabled(struct ctl_table *table, int write, - void __user *buffer, size_t *length, loff_t *ppos) -{ - int cpu; - - if (!write) { - struct perf_event *event; - for_each_online_cpu(cpu) { - event = per_cpu(nmi_watchdog_ev, cpu); - if (event && event->state > PERF_EVENT_STATE_OFF) { - nmi_watchdog_enabled = 1; - break; - } - } - proc_dointvec(table, write, buffer, length, ppos); - return 0; - } - - touch_all_nmi_watchdog(); - proc_dointvec(table, write, buffer, length, ppos); - if (nmi_watchdog_enabled) { - for_each_online_cpu(cpu) - if (enable_nmi_watchdog(cpu)) { - printk(KERN_ERR "NMI watchdog failed configuration, " - " can not be enabled\n"); - } - } else { - for_each_online_cpu(cpu) - disable_nmi_watchdog(cpu); - } - return 0; -} - -#endif /* CONFIG_SYSCTL */ - -/* - * Create/destroy watchdog threads as CPUs come and go: - */ -static int __cpuinit -cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) -{ - int hotcpu = (unsigned long)hcpu; - - switch (action) { - case CPU_UP_PREPARE: - case CPU_UP_PREPARE_FROZEN: - per_cpu(nmi_watchdog_touch, hotcpu) = 0; - break; - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - if (enable_nmi_watchdog(hotcpu)) - return NOTIFY_BAD; - break; -#ifdef CONFIG_HOTPLUG_CPU - case CPU_UP_CANCELED: - case CPU_UP_CANCELED_FROZEN: - disable_nmi_watchdog(hotcpu); - case CPU_DEAD: - case CPU_DEAD_FROZEN: - break; -#endif /* CONFIG_HOTPLUG_CPU */ - } - return NOTIFY_OK; -} - -static struct notifier_block __cpuinitdata cpu_nfb = { - .notifier_call = cpu_callback -}; - -static int __initdata nonmi_watchdog; - -static int __init nonmi_watchdog_setup(char *str) -{ - nonmi_watchdog = 1; - return 1; -} -__setup("nonmi_watchdog", nonmi_watchdog_setup); - -static int __init spawn_nmi_watchdog_task(void) -{ - void *cpu = (void *)(long)smp_processor_id(); - int err; - - if (nonmi_watchdog) - return 0; - - printk(KERN_INFO "NMI watchdog enabled, takes one hw-pmu counter.\n"); - - err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu); - if (err == NOTIFY_BAD) { - BUG(); - return 1; - } - cpu_callback(&cpu_nfb, CPU_ONLINE, cpu); - register_cpu_notifier(&cpu_nfb); - - return 0; -} -early_initcall(spawn_nmi_watchdog_task);