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x86: nmi_32/64.c - merge down nmi_32.c and nmi_64.c to nmi.c
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com> Cc: hpa@zytor.com Cc: mingo@redhat.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Cyrill Gorcunov
Thomas Gleixner
parent
fd5cea02de
commit
1798bc22b2
@ -53,7 +53,7 @@ obj-$(CONFIG_X86_32_SMP) += smpcommon.o
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obj-$(CONFIG_X86_64_SMP) += tsc_sync.o smpcommon.o
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obj-$(CONFIG_X86_TRAMPOLINE) += trampoline_$(BITS).o
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obj-$(CONFIG_X86_MPPARSE) += mpparse.o
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obj-$(CONFIG_X86_LOCAL_APIC) += apic_$(BITS).o nmi_$(BITS).o
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obj-$(CONFIG_X86_LOCAL_APIC) += apic_$(BITS).o nmi.o
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obj-$(CONFIG_X86_IO_APIC) += io_apic_$(BITS).o
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obj-$(CONFIG_X86_REBOOTFIXUPS) += reboot_fixups_32.o
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obj-$(CONFIG_KEXEC) += machine_kexec_$(BITS).o
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@ -11,10 +11,11 @@
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* Mikael Pettersson : PM converted to driver model. Disable/enable API.
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*/
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#include <linux/nmi.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/nmi.h>
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#include <linux/sysdev.h>
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#include <linux/sysctl.h>
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#include <linux/percpu.h>
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@ -22,13 +23,15 @@
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#include <linux/cpumask.h>
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#include <linux/kernel_stat.h>
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#include <linux/kdebug.h>
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#include <linux/slab.h>
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#include <asm/smp.h>
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#include <asm/nmi.h>
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#include <asm/proto.h>
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#include <asm/timer.h>
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#include "mach_traps.h"
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#include <asm/mce.h>
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#include <mach_traps.h>
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int unknown_nmi_panic;
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int nmi_watchdog_enabled;
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@ -45,19 +48,25 @@ atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
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static int panic_on_timeout;
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unsigned int nmi_watchdog = NMI_DEFAULT;
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static unsigned int nmi_hz = HZ;
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static DEFINE_PER_CPU(short, wd_enabled);
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static int endflag __initdata = 0;
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static inline unsigned int get_nmi_count(int cpu)
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{
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#ifdef CONFIG_X86_64
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return cpu_pda(cpu)->__nmi_count;
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#else
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return nmi_count(cpu);
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#endif
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}
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static inline int mce_in_progress(void)
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{
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#if defined(CONFIX_X86_64) && defined(CONFIG_X86_MCE)
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return atomic_read(&mce_entry) > 0;
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#endif
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return 0;
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}
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@ -67,8 +76,12 @@ static inline int mce_in_progress(void)
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*/
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static inline unsigned int get_timer_irqs(int cpu)
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{
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#ifdef CONFIG_X86_64
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return read_pda(apic_timer_irqs) + read_pda(irq0_irqs);
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#else
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return per_cpu(irq_stat, cpu).apic_timer_irqs +
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per_cpu(irq_stat, cpu).irq0_irqs;
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#endif
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}
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/* Run after command line and cpu_init init, but before all other checks */
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@ -76,26 +89,33 @@ void nmi_watchdog_default(void)
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{
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if (nmi_watchdog != NMI_DEFAULT)
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return;
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#ifdef CONFIG_X86_64
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nmi_watchdog = NMI_NONE;
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#else
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if (lapic_watchdog_ok())
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nmi_watchdog = NMI_LOCAL_APIC;
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else
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nmi_watchdog = NMI_IO_APIC;
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#endif
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}
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#ifdef CONFIG_SMP
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/* The performance counters used by NMI_LOCAL_APIC don't trigger when
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/*
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* The performance counters used by NMI_LOCAL_APIC don't trigger when
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* the CPU is idle. To make sure the NMI watchdog really ticks on all
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* CPUs during the test make them busy.
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*/
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static __init void nmi_cpu_busy(void *data)
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{
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local_irq_enable_in_hardirq();
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/* Intentionally don't use cpu_relax here. This is
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to make sure that the performance counter really ticks,
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even if there is a simulator or similar that catches the
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pause instruction. On a real HT machine this is fine because
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all other CPUs are busy with "useless" delay loops and don't
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care if they get somewhat less cycles. */
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/*
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* Intentionally don't use cpu_relax here. This is
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* to make sure that the performance counter really ticks,
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* even if there is a simulator or similar that catches the
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* pause instruction. On a real HT machine this is fine because
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* all other CPUs are busy with "useless" delay loops and don't
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* care if they get somewhat less cycles.
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*/
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while (endflag == 0)
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mb();
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}
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@ -106,7 +126,7 @@ int __init check_nmi_watchdog(void)
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unsigned int *prev_nmi_count;
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int cpu;
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if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DISABLED))
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if (nmi_watchdog == NMI_NONE || nmi_watchdog == NMI_DISABLED)
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return 0;
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if (!atomic_read(&nmi_active))
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@ -126,7 +146,7 @@ int __init check_nmi_watchdog(void)
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for_each_possible_cpu(cpu)
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prev_nmi_count[cpu] = get_nmi_count(cpu);
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local_irq_enable();
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mdelay((20*1000)/nmi_hz); // wait 20 ticks
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mdelay((20 * 1000) / nmi_hz); /* wait 20 ticks */
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for_each_online_cpu(cpu) {
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if (!per_cpu(wd_enabled, cpu))
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@ -149,16 +169,20 @@ int __init check_nmi_watchdog(void)
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}
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printk("OK.\n");
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/* now that we know it works we can reduce NMI frequency to
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something more reasonable; makes a difference in some configs */
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/*
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* now that we know it works we can reduce NMI frequency to
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* something more reasonable; makes a difference in some configs
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*/
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if (nmi_watchdog == NMI_LOCAL_APIC)
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nmi_hz = lapic_adjust_nmi_hz(1);
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kfree(prev_nmi_count);
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return 0;
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error:
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timer_ack = !cpu_has_tsc;
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error:
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#ifdef CONFIG_X86_32
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timer_ack = !cpu_has_tsc;
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#endif
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return -1;
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}
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@ -176,18 +200,17 @@ static int __init setup_nmi_watchdog(char *str)
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get_option(&str, &nmi);
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if ((nmi >= NMI_INVALID) || (nmi < NMI_NONE))
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if (nmi >= NMI_INVALID || nmi < NMI_NONE)
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return 0;
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nmi_watchdog = nmi;
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return 1;
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}
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__setup("nmi_watchdog=", setup_nmi_watchdog);
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/* Suspend/resume support */
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/*
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* Suspend/resume support
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*/
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#ifdef CONFIG_PM
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static int nmi_pm_active; /* nmi_active before suspend */
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@ -211,7 +234,6 @@ static int lapic_nmi_resume(struct sys_device *dev)
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return 0;
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}
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static struct sysdev_class nmi_sysclass = {
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.name = "lapic_nmi",
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.resume = lapic_nmi_resume,
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@ -227,7 +249,8 @@ static int __init init_lapic_nmi_sysfs(void)
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{
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int error;
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/* should really be a BUG_ON but b/c this is an
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/*
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* should really be a BUG_ON but b/c this is an
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* init call, it just doesn't work. -dcz
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*/
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if (nmi_watchdog != NMI_LOCAL_APIC)
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@ -241,6 +264,7 @@ static int __init init_lapic_nmi_sysfs(void)
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error = sysdev_register(&device_lapic_nmi);
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return error;
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}
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/* must come after the local APIC's device_initcall() */
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late_initcall(init_lapic_nmi_sysfs);
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@ -281,12 +305,13 @@ void setup_apic_nmi_watchdog(void *unused)
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/* cheap hack to support suspend/resume */
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/* if cpu0 is not active neither should the other cpus */
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if ((smp_processor_id() != 0) && (atomic_read(&nmi_active) <= 0))
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if (smp_processor_id() != 0 && atomic_read(&nmi_active) <= 0)
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return;
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switch (nmi_watchdog) {
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case NMI_LOCAL_APIC:
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__get_cpu_var(wd_enabled) = 1; /* enable it before to avoid race with handler */
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/* enable it before to avoid race with handler */
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__get_cpu_var(wd_enabled) = 1;
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if (lapic_watchdog_init(nmi_hz) < 0) {
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__get_cpu_var(wd_enabled) = 0;
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return;
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@ -301,9 +326,9 @@ void setup_apic_nmi_watchdog(void *unused)
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void stop_apic_nmi_watchdog(void *unused)
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{
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/* only support LOCAL and IO APICs for now */
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if ((nmi_watchdog != NMI_LOCAL_APIC) &&
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(nmi_watchdog != NMI_IO_APIC))
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return;
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if (nmi_watchdog != NMI_LOCAL_APIC &&
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nmi_watchdog != NMI_IO_APIC)
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return;
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if (__get_cpu_var(wd_enabled) == 0)
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return;
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if (nmi_watchdog == NMI_LOCAL_APIC)
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@ -323,8 +348,7 @@ void stop_apic_nmi_watchdog(void *unused)
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* since NMIs don't listen to _any_ locks, we have to be extremely
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* careful not to rely on unsafe variables. The printk might lock
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* up though, so we have to break up any console locks first ...
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* [when there will be more tty-related locks, break them up
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* here too!]
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* [when there will be more tty-related locks, break them up here too!]
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*/
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static DEFINE_PER_CPU(unsigned, last_irq_sum);
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@ -357,7 +381,6 @@ EXPORT_SYMBOL(touch_nmi_watchdog);
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notrace __kprobes int
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nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
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{
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/*
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* Since current_thread_info()-> is always on the stack, and we
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* always switch the stack NMI-atomically, it's safe to use
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@ -403,7 +426,7 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
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* wait a few IRQs (5 seconds) before doing the oops ...
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*/
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local_inc(&__get_cpu_var(alert_counter));
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if (local_read(&__get_cpu_var(alert_counter)) == 5*nmi_hz)
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if (local_read(&__get_cpu_var(alert_counter)) == 5 * nmi_hz)
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/*
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* die_nmi will return ONLY if NOTIFY_STOP happens..
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*/
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@ -413,6 +436,7 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
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__get_cpu_var(last_irq_sum) = sum;
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local_set(&__get_cpu_var(alert_counter), 0);
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}
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/* see if the nmi watchdog went off */
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if (!__get_cpu_var(wd_enabled))
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return rc;
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@ -421,7 +445,8 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
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rc |= lapic_wd_event(nmi_hz);
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break;
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case NMI_IO_APIC:
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/* don't know how to accurately check for this.
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/*
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* don't know how to accurately check for this.
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* just assume it was a watchdog timer interrupt
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* This matches the old behaviour.
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*/
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@ -458,7 +483,8 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file,
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return 0;
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if (atomic_read(&nmi_active) < 0 || nmi_watchdog == NMI_DISABLED) {
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printk( KERN_WARNING "NMI watchdog is permanently disabled\n");
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printk(KERN_WARNING
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"NMI watchdog is permanently disabled\n");
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return -EIO;
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}
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@ -471,14 +497,14 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file,
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else
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disable_lapic_nmi_watchdog();
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} else {
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printk( KERN_WARNING
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printk(KERN_WARNING
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"NMI watchdog doesn't know what hardware to touch\n");
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return -EIO;
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}
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return 0;
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}
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#endif
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#endif /* CONFIG_SYSCTL */
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int do_nmi_callback(struct pt_regs *regs, int cpu)
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{
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@ -504,3 +530,4 @@ void __trigger_all_cpu_backtrace(void)
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EXPORT_SYMBOL(nmi_active);
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EXPORT_SYMBOL(nmi_watchdog);
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@ -1,477 +0,0 @@
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/*
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* NMI watchdog support on APIC systems
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*
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* Started by Ingo Molnar <mingo@redhat.com>
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*
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* Fixes:
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* Mikael Pettersson : AMD K7 support for local APIC NMI watchdog.
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* Mikael Pettersson : Power Management for local APIC NMI watchdog.
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* Pavel Machek and
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* Mikael Pettersson : PM converted to driver model. Disable/enable API.
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*/
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#include <linux/nmi.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/sysdev.h>
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#include <linux/sysctl.h>
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#include <linux/kprobes.h>
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#include <linux/cpumask.h>
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#include <linux/kdebug.h>
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#include <asm/smp.h>
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#include <asm/nmi.h>
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#include <asm/proto.h>
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#include <asm/mce.h>
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#include <mach_traps.h>
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int unknown_nmi_panic;
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int nmi_watchdog_enabled;
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static cpumask_t backtrace_mask = CPU_MASK_NONE;
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/* nmi_active:
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* >0: the lapic NMI watchdog is active, but can be disabled
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* <0: the lapic NMI watchdog has not been set up, and cannot
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* be enabled
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* 0: the lapic NMI watchdog is disabled, but can be enabled
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*/
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atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
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static int panic_on_timeout;
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unsigned int nmi_watchdog = NMI_DEFAULT;
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static unsigned int nmi_hz = HZ;
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static DEFINE_PER_CPU(short, wd_enabled);
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static int endflag __initdata = 0;
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static inline unsigned int get_nmi_count(int cpu)
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{
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return cpu_pda(cpu)->__nmi_count;
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}
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static inline int mce_in_progress(void)
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{
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#ifdef CONFIG_X86_MCE
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return atomic_read(&mce_entry) > 0;
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#endif
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return 0;
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}
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/*
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* Take the local apic timer and PIT/HPET into account. We don't
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* know which one is active, when we have highres/dyntick on
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*/
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static inline unsigned int get_timer_irqs(int cpu)
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{
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return read_pda(apic_timer_irqs) + read_pda(irq0_irqs);
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}
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/* Run after command line and cpu_init init, but before all other checks */
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void nmi_watchdog_default(void)
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{
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if (nmi_watchdog != NMI_DEFAULT)
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return;
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nmi_watchdog = NMI_NONE;
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}
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#ifdef CONFIG_SMP
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/* The performance counters used by NMI_LOCAL_APIC don't trigger when
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* the CPU is idle. To make sure the NMI watchdog really ticks on all
|
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* CPUs during the test make them busy.
|
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*/
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static __init void nmi_cpu_busy(void *data)
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{
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local_irq_enable_in_hardirq();
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/* Intentionally don't use cpu_relax here. This is
|
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to make sure that the performance counter really ticks,
|
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even if there is a simulator or similar that catches the
|
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pause instruction. On a real HT machine this is fine because
|
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all other CPUs are busy with "useless" delay loops and don't
|
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care if they get somewhat less cycles. */
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while (endflag == 0)
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mb();
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}
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#endif
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int __init check_nmi_watchdog(void)
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{
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unsigned int *prev_nmi_count;
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int cpu;
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if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DISABLED))
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return 0;
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if (!atomic_read(&nmi_active))
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return 0;
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prev_nmi_count = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);
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if (!prev_nmi_count)
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return -1;
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printk(KERN_INFO "Testing NMI watchdog ... ");
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#ifdef CONFIG_SMP
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if (nmi_watchdog == NMI_LOCAL_APIC)
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smp_call_function(nmi_cpu_busy, (void *)&endflag, 0, 0);
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#endif
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for_each_possible_cpu(cpu)
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prev_nmi_count[cpu] = get_nmi_count(cpu);
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local_irq_enable();
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||||
mdelay((20*1000)/nmi_hz); // wait 20 ticks
|
||||
|
||||
for_each_online_cpu(cpu) {
|
||||
if (!per_cpu(wd_enabled, cpu))
|
||||
continue;
|
||||
if (get_nmi_count(cpu) - prev_nmi_count[cpu] <= 5) {
|
||||
printk(KERN_WARNING "WARNING: CPU#%d: NMI "
|
||||
"appears to be stuck (%d->%d)!\n",
|
||||
cpu,
|
||||
prev_nmi_count[cpu],
|
||||
get_nmi_count(cpu));
|
||||
per_cpu(wd_enabled, cpu) = 0;
|
||||
atomic_dec(&nmi_active);
|
||||
}
|
||||
}
|
||||
endflag = 1;
|
||||
if (!atomic_read(&nmi_active)) {
|
||||
kfree(prev_nmi_count);
|
||||
atomic_set(&nmi_active, -1);
|
||||
return -1;
|
||||
}
|
||||
printk("OK.\n");
|
||||
|
||||
/* now that we know it works we can reduce NMI frequency to
|
||||
something more reasonable; makes a difference in some configs */
|
||||
if (nmi_watchdog == NMI_LOCAL_APIC)
|
||||
nmi_hz = lapic_adjust_nmi_hz(1);
|
||||
|
||||
kfree(prev_nmi_count);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init setup_nmi_watchdog(char *str)
|
||||
{
|
||||
int nmi;
|
||||
|
||||
if (!strncmp(str,"panic",5)) {
|
||||
panic_on_timeout = 1;
|
||||
str = strchr(str, ',');
|
||||
if (!str)
|
||||
return 1;
|
||||
++str;
|
||||
}
|
||||
|
||||
get_option(&str, &nmi);
|
||||
|
||||
if ((nmi >= NMI_INVALID) || (nmi < NMI_NONE))
|
||||
return 0;
|
||||
|
||||
nmi_watchdog = nmi;
|
||||
return 1;
|
||||
}
|
||||
|
||||
__setup("nmi_watchdog=", setup_nmi_watchdog);
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
|
||||
static int nmi_pm_active; /* nmi_active before suspend */
|
||||
|
||||
static int lapic_nmi_suspend(struct sys_device *dev, pm_message_t state)
|
||||
{
|
||||
/* only CPU0 goes here, other CPUs should be offline */
|
||||
nmi_pm_active = atomic_read(&nmi_active);
|
||||
stop_apic_nmi_watchdog(NULL);
|
||||
BUG_ON(atomic_read(&nmi_active) != 0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int lapic_nmi_resume(struct sys_device *dev)
|
||||
{
|
||||
/* only CPU0 goes here, other CPUs should be offline */
|
||||
if (nmi_pm_active > 0) {
|
||||
setup_apic_nmi_watchdog(NULL);
|
||||
touch_nmi_watchdog();
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct sysdev_class nmi_sysclass = {
|
||||
.name = "lapic_nmi",
|
||||
.resume = lapic_nmi_resume,
|
||||
.suspend = lapic_nmi_suspend,
|
||||
};
|
||||
|
||||
static struct sys_device device_lapic_nmi = {
|
||||
.id = 0,
|
||||
.cls = &nmi_sysclass,
|
||||
};
|
||||
|
||||
static int __init init_lapic_nmi_sysfs(void)
|
||||
{
|
||||
int error;
|
||||
|
||||
/* should really be a BUG_ON but b/c this is an
|
||||
* init call, it just doesn't work. -dcz
|
||||
*/
|
||||
if (nmi_watchdog != NMI_LOCAL_APIC)
|
||||
return 0;
|
||||
|
||||
if (atomic_read(&nmi_active) < 0)
|
||||
return 0;
|
||||
|
||||
error = sysdev_class_register(&nmi_sysclass);
|
||||
if (!error)
|
||||
error = sysdev_register(&device_lapic_nmi);
|
||||
return error;
|
||||
}
|
||||
/* must come after the local APIC's device_initcall() */
|
||||
late_initcall(init_lapic_nmi_sysfs);
|
||||
|
||||
#endif /* CONFIG_PM */
|
||||
|
||||
static void __acpi_nmi_enable(void *__unused)
|
||||
{
|
||||
apic_write_around(APIC_LVT0, APIC_DM_NMI);
|
||||
}
|
||||
|
||||
/*
|
||||
* Enable timer based NMIs on all CPUs:
|
||||
*/
|
||||
void acpi_nmi_enable(void)
|
||||
{
|
||||
if (atomic_read(&nmi_active) && nmi_watchdog == NMI_IO_APIC)
|
||||
on_each_cpu(__acpi_nmi_enable, NULL, 0, 1);
|
||||
}
|
||||
|
||||
static void __acpi_nmi_disable(void *__unused)
|
||||
{
|
||||
apic_write_around(APIC_LVT0, APIC_DM_NMI | APIC_LVT_MASKED);
|
||||
}
|
||||
|
||||
/*
|
||||
* Disable timer based NMIs on all CPUs:
|
||||
*/
|
||||
void acpi_nmi_disable(void)
|
||||
{
|
||||
if (atomic_read(&nmi_active) && nmi_watchdog == NMI_IO_APIC)
|
||||
on_each_cpu(__acpi_nmi_disable, NULL, 0, 1);
|
||||
}
|
||||
|
||||
void setup_apic_nmi_watchdog(void *unused)
|
||||
{
|
||||
if (__get_cpu_var(wd_enabled))
|
||||
return;
|
||||
|
||||
/* cheap hack to support suspend/resume */
|
||||
/* if cpu0 is not active neither should the other cpus */
|
||||
if ((smp_processor_id() != 0) && (atomic_read(&nmi_active) <= 0))
|
||||
return;
|
||||
|
||||
switch (nmi_watchdog) {
|
||||
case NMI_LOCAL_APIC:
|
||||
__get_cpu_var(wd_enabled) = 1;
|
||||
if (lapic_watchdog_init(nmi_hz) < 0) {
|
||||
__get_cpu_var(wd_enabled) = 0;
|
||||
return;
|
||||
}
|
||||
/* FALL THROUGH */
|
||||
case NMI_IO_APIC:
|
||||
__get_cpu_var(wd_enabled) = 1;
|
||||
atomic_inc(&nmi_active);
|
||||
}
|
||||
}
|
||||
|
||||
void stop_apic_nmi_watchdog(void *unused)
|
||||
{
|
||||
/* only support LOCAL and IO APICs for now */
|
||||
if ((nmi_watchdog != NMI_LOCAL_APIC) &&
|
||||
(nmi_watchdog != NMI_IO_APIC))
|
||||
return;
|
||||
if (__get_cpu_var(wd_enabled) == 0)
|
||||
return;
|
||||
if (nmi_watchdog == NMI_LOCAL_APIC)
|
||||
lapic_watchdog_stop();
|
||||
__get_cpu_var(wd_enabled) = 0;
|
||||
atomic_dec(&nmi_active);
|
||||
}
|
||||
|
||||
/*
|
||||
* the best way to detect whether a CPU has a 'hard lockup' problem
|
||||
* is to check it's local APIC timer IRQ counts. If they are not
|
||||
* changing then that CPU has some problem.
|
||||
*
|
||||
* as these watchdog NMI IRQs are generated on every CPU, we only
|
||||
* have to check the current processor.
|
||||
*/
|
||||
|
||||
static DEFINE_PER_CPU(unsigned, last_irq_sum);
|
||||
static DEFINE_PER_CPU(local_t, alert_counter);
|
||||
static DEFINE_PER_CPU(int, nmi_touch);
|
||||
|
||||
void touch_nmi_watchdog(void)
|
||||
{
|
||||
if (nmi_watchdog > 0) {
|
||||
unsigned cpu;
|
||||
|
||||
/*
|
||||
* Tell other CPUs to reset their alert counters. We cannot
|
||||
* do it ourselves because the alert count increase is not
|
||||
* atomic.
|
||||
*/
|
||||
for_each_present_cpu(cpu) {
|
||||
if (per_cpu(nmi_touch, cpu) != 1)
|
||||
per_cpu(nmi_touch, cpu) = 1;
|
||||
}
|
||||
}
|
||||
|
||||
touch_softlockup_watchdog();
|
||||
}
|
||||
EXPORT_SYMBOL(touch_nmi_watchdog);
|
||||
|
||||
notrace __kprobes int
|
||||
nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
|
||||
{
|
||||
unsigned int sum;
|
||||
int touched = 0;
|
||||
int cpu = smp_processor_id();
|
||||
int rc = 0;
|
||||
|
||||
/* check for other users first */
|
||||
if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT)
|
||||
== NOTIFY_STOP) {
|
||||
rc = 1;
|
||||
touched = 1;
|
||||
}
|
||||
|
||||
sum = get_timer_irqs(cpu);
|
||||
|
||||
if (__get_cpu_var(nmi_touch)) {
|
||||
__get_cpu_var(nmi_touch) = 0;
|
||||
touched = 1;
|
||||
}
|
||||
|
||||
if (cpu_isset(cpu, backtrace_mask)) {
|
||||
static DEFINE_SPINLOCK(lock); /* Serialise the printks */
|
||||
|
||||
spin_lock(&lock);
|
||||
printk("NMI backtrace for cpu %d\n", cpu);
|
||||
dump_stack();
|
||||
spin_unlock(&lock);
|
||||
cpu_clear(cpu, backtrace_mask);
|
||||
}
|
||||
|
||||
if (mce_in_progress())
|
||||
touched = 1;
|
||||
|
||||
/* if the apic timer isn't firing, this cpu isn't doing much */
|
||||
if (!touched && __get_cpu_var(last_irq_sum) == sum) {
|
||||
/*
|
||||
* Ayiee, looks like this CPU is stuck ...
|
||||
* wait a few IRQs (5 seconds) before doing the oops ...
|
||||
*/
|
||||
local_inc(&__get_cpu_var(alert_counter));
|
||||
if (local_read(&__get_cpu_var(alert_counter)) == 5*nmi_hz)
|
||||
die_nmi("NMI Watchdog detected LOCKUP",
|
||||
regs, panic_on_timeout);
|
||||
} else {
|
||||
__get_cpu_var(last_irq_sum) = sum;
|
||||
local_set(&__get_cpu_var(alert_counter), 0);
|
||||
}
|
||||
|
||||
/* see if the nmi watchdog went off */
|
||||
if (!__get_cpu_var(wd_enabled))
|
||||
return rc;
|
||||
switch (nmi_watchdog) {
|
||||
case NMI_LOCAL_APIC:
|
||||
rc |= lapic_wd_event(nmi_hz);
|
||||
break;
|
||||
case NMI_IO_APIC:
|
||||
/* don't know how to accurately check for this.
|
||||
* just assume it was a watchdog timer interrupt
|
||||
* This matches the old behaviour.
|
||||
*/
|
||||
rc = 1;
|
||||
break;
|
||||
}
|
||||
return rc;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SYSCTL
|
||||
|
||||
static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
|
||||
{
|
||||
unsigned char reason = get_nmi_reason();
|
||||
char buf[64];
|
||||
|
||||
sprintf(buf, "NMI received for unknown reason %02x\n", reason);
|
||||
die_nmi(buf, regs, 1); /* Always panic here */
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* proc handler for /proc/sys/kernel/nmi
|
||||
*/
|
||||
int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file,
|
||||
void __user *buffer, size_t *length, loff_t *ppos)
|
||||
{
|
||||
int old_state;
|
||||
|
||||
nmi_watchdog_enabled = (atomic_read(&nmi_active) > 0) ? 1 : 0;
|
||||
old_state = nmi_watchdog_enabled;
|
||||
proc_dointvec(table, write, file, buffer, length, ppos);
|
||||
if (!!old_state == !!nmi_watchdog_enabled)
|
||||
return 0;
|
||||
|
||||
if (atomic_read(&nmi_active) < 0 || nmi_watchdog == NMI_DISABLED) {
|
||||
printk( KERN_WARNING "NMI watchdog is permanently disabled\n");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
/* if nmi_watchdog is not set yet, then set it */
|
||||
nmi_watchdog_default();
|
||||
|
||||
if (nmi_watchdog == NMI_LOCAL_APIC) {
|
||||
if (nmi_watchdog_enabled)
|
||||
enable_lapic_nmi_watchdog();
|
||||
else
|
||||
disable_lapic_nmi_watchdog();
|
||||
} else {
|
||||
printk( KERN_WARNING
|
||||
"NMI watchdog doesn't know what hardware to touch\n");
|
||||
return -EIO;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
int do_nmi_callback(struct pt_regs *regs, int cpu)
|
||||
{
|
||||
#ifdef CONFIG_SYSCTL
|
||||
if (unknown_nmi_panic)
|
||||
return unknown_nmi_panic_callback(regs, cpu);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
void __trigger_all_cpu_backtrace(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
backtrace_mask = cpu_online_map;
|
||||
/* Wait for up to 10 seconds for all CPUs to do the backtrace */
|
||||
for (i = 0; i < 10 * 1000; i++) {
|
||||
if (cpus_empty(backtrace_mask))
|
||||
break;
|
||||
mdelay(1);
|
||||
}
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(nmi_active);
|
||||
EXPORT_SYMBOL(nmi_watchdog);
|
||||
Loading…
Reference in New Issue
Block a user