obj-$(CONFIG_X86_64_SMP) += tsc_sync.o smpcommon.o
obj-$(CONFIG_X86_TRAMPOLINE) += trampoline_$(BITS).o
obj-$(CONFIG_X86_MPPARSE) += mpparse.o
-obj-$(CONFIG_X86_LOCAL_APIC) += apic_$(BITS).o nmi_$(BITS).o
+obj-$(CONFIG_X86_LOCAL_APIC) += apic_$(BITS).o nmi.o
obj-$(CONFIG_X86_IO_APIC) += io_apic_$(BITS).o
obj-$(CONFIG_X86_REBOOTFIXUPS) += reboot_fixups_32.o
obj-$(CONFIG_KEXEC) += machine_kexec_$(BITS).o
return;
on_each_cpu(stop_apic_nmi_watchdog, NULL, 0, 1);
- wd_ops->unreserve();
+
+ if (wd_ops)
+ wd_ops->unreserve();
BUG_ON(atomic_read(&nmi_active) != 0);
}
* Fixes:
* Mikael Pettersson : AMD K7 support for local APIC NMI watchdog.
* Mikael Pettersson : Power Management for local APIC NMI watchdog.
+ * Mikael Pettersson : Pentium 4 support for local APIC NMI watchdog.
* Pavel Machek and
* Mikael Pettersson : PM converted to driver model. Disable/enable API.
*/
+#include <asm/apic.h>
+
#include <linux/nmi.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/sysdev.h>
#include <linux/sysctl.h>
+#include <linux/percpu.h>
#include <linux/kprobes.h>
#include <linux/cpumask.h>
+#include <linux/kernel_stat.h>
#include <linux/kdebug.h>
+#include <linux/smp.h>
#include <asm/i8259.h>
#include <asm/io_apic.h>
#include <asm/smp.h>
#include <asm/nmi.h>
#include <asm/proto.h>
+#include <asm/timer.h>
+
#include <asm/mce.h>
#include <mach_traps.h>
int unknown_nmi_panic;
int nmi_watchdog_enabled;
-int panic_on_unrecovered_nmi;
static cpumask_t backtrace_mask = CPU_MASK_NONE;
* 0: the lapic NMI watchdog is disabled, but can be enabled
*/
atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
-static int panic_on_timeout;
+EXPORT_SYMBOL(nmi_active);
unsigned int nmi_watchdog = NMI_DEFAULT;
-static unsigned int nmi_hz = HZ;
+EXPORT_SYMBOL(nmi_watchdog);
+
+static int panic_on_timeout;
+static unsigned int nmi_hz = HZ;
static DEFINE_PER_CPU(short, wd_enabled);
+static int endflag __initdata;
+
+static inline unsigned int get_nmi_count(int cpu)
+{
+#ifdef CONFIG_X86_64
+ return cpu_pda(cpu)->__nmi_count;
+#else
+ return nmi_count(cpu);
+#endif
+}
+
+static inline int mce_in_progress(void)
+{
+#if defined(CONFIG_X86_64) && defined(CONFIG_X86_MCE)
+ return atomic_read(&mce_entry) > 0;
+#endif
+ return 0;
+}
+
+/*
+ * Take the local apic timer and PIT/HPET into account. We don't
+ * know which one is active, when we have highres/dyntick on
+ */
+static inline unsigned int get_timer_irqs(int cpu)
+{
+#ifdef CONFIG_X86_64
+ return read_pda(apic_timer_irqs) + read_pda(irq0_irqs);
+#else
+ return per_cpu(irq_stat, cpu).apic_timer_irqs +
+ per_cpu(irq_stat, cpu).irq0_irqs;
+#endif
+}
/* Run after command line and cpu_init init, but before all other checks */
void nmi_watchdog_default(void)
nmi_watchdog = NMI_NONE;
}
-static int endflag __initdata = 0;
-
#ifdef CONFIG_SMP
-/* The performance counters used by NMI_LOCAL_APIC don't trigger when
+/*
+ * The performance counters used by NMI_LOCAL_APIC don't trigger when
* the CPU is idle. To make sure the NMI watchdog really ticks on all
* CPUs during the test make them busy.
*/
static __init void nmi_cpu_busy(void *data)
{
local_irq_enable_in_hardirq();
- /* Intentionally don't use cpu_relax here. This is
- to make sure that the performance counter really ticks,
- even if there is a simulator or similar that catches the
- pause instruction. On a real HT machine this is fine because
- all other CPUs are busy with "useless" delay loops and don't
- care if they get somewhat less cycles. */
+ /*
+ * Intentionally don't use cpu_relax here. This is
+ * to make sure that the performance counter really ticks,
+ * even if there is a simulator or similar that catches the
+ * pause instruction. On a real HT machine this is fine because
+ * all other CPUs are busy with "useless" delay loops and don't
+ * care if they get somewhat less cycles.
+ */
while (endflag == 0)
mb();
}
int __init check_nmi_watchdog(void)
{
- int *prev_nmi_count;
+ unsigned int *prev_nmi_count;
int cpu;
- if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DISABLED))
+ if (nmi_watchdog == NMI_NONE || nmi_watchdog == NMI_DISABLED)
return 0;
if (!atomic_read(&nmi_active))
smp_call_function(nmi_cpu_busy, (void *)&endflag, 0, 0);
#endif
- for (cpu = 0; cpu < nr_cpu_ids; cpu++)
- prev_nmi_count[cpu] = cpu_pda(cpu)->__nmi_count;
+ for_each_possible_cpu(cpu)
+ prev_nmi_count[cpu] = get_nmi_count(cpu);
local_irq_enable();
- mdelay((20*1000)/nmi_hz); // wait 20 ticks
+ mdelay((20 * 1000) / nmi_hz); /* wait 20 ticks */
for_each_online_cpu(cpu) {
if (!per_cpu(wd_enabled, cpu))
continue;
- if (cpu_pda(cpu)->__nmi_count - prev_nmi_count[cpu] <= 5) {
+ if (get_nmi_count(cpu) - prev_nmi_count[cpu] <= 5) {
printk(KERN_WARNING "WARNING: CPU#%d: NMI "
- "appears to be stuck (%d->%d)!\n",
+ "appears to be stuck (%d->%d)!\n",
cpu,
prev_nmi_count[cpu],
- cpu_pda(cpu)->__nmi_count);
+ get_nmi_count(cpu));
per_cpu(wd_enabled, cpu) = 0;
atomic_dec(&nmi_active);
}
}
printk("OK.\n");
- /* now that we know it works we can reduce NMI frequency to
- something more reasonable; makes a difference in some configs */
+ /*
+ * 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);
error:
if (nmi_watchdog == NMI_IO_APIC && !timer_through_8259)
disable_8259A_irq(0);
-
return -1;
}
{
int nmi;
- if (!strncmp(str,"panic",5)) {
+ if (!strncmp(str, "panic", 5)) {
panic_on_timeout = 1;
str = strchr(str, ',');
if (!str)
get_option(&str, &nmi);
- if ((nmi >= NMI_INVALID) || (nmi < NMI_NONE))
+ if (nmi >= NMI_INVALID || nmi < NMI_NONE)
return 0;
nmi_watchdog = nmi;
return 1;
}
-
__setup("nmi_watchdog=", setup_nmi_watchdog);
+/*
+ * Suspend/resume support
+ */
#ifdef CONFIG_PM
static int nmi_pm_active; /* nmi_active before suspend */
{
int error;
- /* should really be a BUG_ON but b/c this is an
+ /*
+ * 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)
error = sysdev_register(&device_lapic_nmi);
return error;
}
+
/* must come after the local APIC's device_initcall() */
late_initcall(init_lapic_nmi_sysfs);
static void __acpi_nmi_enable(void *__unused)
{
- apic_write(APIC_LVT0, APIC_DM_NMI);
+ apic_write_around(APIC_LVT0, APIC_DM_NMI);
}
/*
static void __acpi_nmi_disable(void *__unused)
{
- apic_write(APIC_LVT0, APIC_DM_NMI | APIC_LVT_MASKED);
+ apic_write_around(APIC_LVT0, APIC_DM_NMI | APIC_LVT_MASKED);
}
/*
/* 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))
+ if (smp_processor_id() != 0 && atomic_read(&nmi_active) <= 0)
return;
switch (nmi_watchdog) {
case NMI_LOCAL_APIC:
+ /* enable it before to avoid race with handler */
__get_cpu_var(wd_enabled) = 1;
if (lapic_watchdog_init(nmi_hz) < 0) {
__get_cpu_var(wd_enabled) = 0;
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 (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)
*
* as these watchdog NMI IRQs are generated on every CPU, we only
* have to check the current processor.
+ *
+ * since NMIs don't listen to _any_ locks, we have to be extremely
+ * careful not to rely on unsafe variables. The printk might lock
+ * up though, so we have to break up any console locks first ...
+ * [when there will be more tty-related locks, break them up here too!]
*/
static DEFINE_PER_CPU(unsigned, last_irq_sum);
void touch_nmi_watchdog(void)
{
- if (nmi_watchdog > 0) {
+ if (nmi_watchdog == NMI_LOCAL_APIC ||
+ nmi_watchdog == NMI_IO_APIC) {
unsigned cpu;
/*
- * Tell other CPUs to reset their alert counters. We cannot
+ * Tell other CPUs to reset their alert counters. We cannot
* do it ourselves because the alert count increase is not
* atomic.
*/
}
}
+ /*
+ * Tickle the softlockup detector too:
+ */
touch_softlockup_watchdog();
}
EXPORT_SYMBOL(touch_nmi_watchdog);
notrace __kprobes int
nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
{
- int sum;
+ /*
+ * Since current_thread_info()-> is always on the stack, and we
+ * always switch the stack NMI-atomically, it's safe to use
+ * smp_processor_id().
+ */
+ unsigned int sum;
int touched = 0;
int cpu = smp_processor_id();
int rc = 0;
touched = 1;
}
- sum = read_pda(apic_timer_irqs) + read_pda(irq0_irqs);
+ sum = get_timer_irqs(cpu);
+
if (__get_cpu_var(nmi_touch)) {
__get_cpu_var(nmi_touch) = 0;
touched = 1;
static DEFINE_SPINLOCK(lock); /* Serialise the printks */
spin_lock(&lock);
- printk("NMI backtrace for cpu %d\n", cpu);
+ printk(KERN_WARNING "NMI backtrace for cpu %d\n", cpu);
dump_stack();
spin_unlock(&lock);
cpu_clear(cpu, backtrace_mask);
}
-#ifdef CONFIG_X86_MCE
- /* Could check oops_in_progress here too, but it's safer
- not too */
- if (atomic_read(&mce_entry) > 0)
+ /* Could check oops_in_progress here too, but it's safer not to */
+ if (mce_in_progress())
touched = 1;
-#endif
- /* if the apic timer isn't firing, this cpu isn't doing much */
+
+ /* if the none of the timers 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 on CPU %d\n", regs,
- panic_on_timeout);
+ if (local_read(&__get_cpu_var(alert_counter)) == 5 * nmi_hz)
+ /*
+ * die_nmi will return ONLY if NOTIFY_STOP happens..
+ */
+ die_nmi("BUG: NMI Watchdog detected LOCKUP",
+ regs, panic_on_timeout);
} else {
__get_cpu_var(last_irq_sum) = sum;
local_set(&__get_cpu_var(alert_counter), 0);
rc |= lapic_wd_event(nmi_hz);
break;
case NMI_IO_APIC:
- /* don't know how to accurately check for this.
+ /*
+ * don't know how to accurately check for this.
* just assume it was a watchdog timer interrupt
* This matches the old behaviour.
*/
return rc;
}
-static unsigned ignore_nmis;
-
-asmlinkage notrace __kprobes void
-do_nmi(struct pt_regs *regs, long error_code)
-{
- nmi_enter();
- add_pda(__nmi_count,1);
- if (!ignore_nmis)
- default_do_nmi(regs);
- nmi_exit();
-}
-
-void stop_nmi(void)
-{
- acpi_nmi_disable();
- ignore_nmis++;
-}
-
-void restart_nmi(void)
-{
- ignore_nmis--;
- acpi_nmi_enable();
-}
-
#ifdef CONFIG_SYSCTL
static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
char buf[64];
sprintf(buf, "NMI received for unknown reason %02x\n", reason);
- die_nmi(buf, regs, 1); /* Always panic here */
+ die_nmi(buf, regs, 1); /* Always panic here */
return 0;
}
return 0;
if (atomic_read(&nmi_active) < 0 || nmi_watchdog == NMI_DISABLED) {
- printk( KERN_WARNING "NMI watchdog is permanently disabled\n");
+ printk(KERN_WARNING
+ "NMI watchdog is permanently disabled\n");
return -EIO;
}
/* if nmi_watchdog is not set yet, then set it */
nmi_watchdog_default();
+#ifdef CONFIG_X86_32
+ if (nmi_watchdog == NMI_NONE) {
+ if (lapic_watchdog_ok())
+ nmi_watchdog = NMI_LOCAL_APIC;
+ else
+ nmi_watchdog = NMI_IO_APIC;
+ }
+#endif
+
if (nmi_watchdog == NMI_LOCAL_APIC) {
if (nmi_watchdog_enabled)
enable_lapic_nmi_watchdog();
else
disable_lapic_nmi_watchdog();
} else {
- printk( KERN_WARNING
+ printk(KERN_WARNING
"NMI watchdog doesn't know what hardware to touch\n");
return -EIO;
}
return 0;
}
-#endif
+#endif /* CONFIG_SYSCTL */
int do_nmi_callback(struct pt_regs *regs, int cpu)
{
mdelay(1);
}
}
-
-EXPORT_SYMBOL(nmi_active);
-EXPORT_SYMBOL(nmi_watchdog);
+++ /dev/null
-/*
- * NMI watchdog support on APIC systems
- *
- * Started by Ingo Molnar <mingo@redhat.com>
- *
- * Fixes:
- * Mikael Pettersson : AMD K7 support for local APIC NMI watchdog.
- * Mikael Pettersson : Power Management for local APIC NMI watchdog.
- * Mikael Pettersson : Pentium 4 support for local APIC NMI watchdog.
- * Pavel Machek and
- * Mikael Pettersson : PM converted to driver model. Disable/enable API.
- */
-
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/nmi.h>
-#include <linux/sysdev.h>
-#include <linux/sysctl.h>
-#include <linux/percpu.h>
-#include <linux/kprobes.h>
-#include <linux/cpumask.h>
-#include <linux/kernel_stat.h>
-#include <linux/kdebug.h>
-#include <linux/slab.h>
-
-#include <asm/i8259.h>
-#include <asm/io_apic.h>
-#include <asm/smp.h>
-#include <asm/nmi.h>
-#include <asm/timer.h>
-
-#include "mach_traps.h"
-
-int unknown_nmi_panic;
-int nmi_watchdog_enabled;
-
-static cpumask_t backtrace_mask = CPU_MASK_NONE;
-
-/* nmi_active:
- * >0: the lapic NMI watchdog is active, but can be disabled
- * <0: the lapic NMI watchdog has not been set up, and cannot
- * be enabled
- * 0: the lapic NMI watchdog is disabled, but can be enabled
- */
-atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
-
-unsigned int nmi_watchdog = NMI_DEFAULT;
-static unsigned int nmi_hz = HZ;
-
-static DEFINE_PER_CPU(short, wd_enabled);
-
-static int endflag __initdata = 0;
-
-#ifdef CONFIG_SMP
-/* The performance counters used by NMI_LOCAL_APIC don't trigger when
- * the CPU is idle. To make sure the NMI watchdog really ticks on all
- * CPUs during the test make them busy.
- */
-static __init void nmi_cpu_busy(void *data)
-{
- local_irq_enable_in_hardirq();
- /* Intentionally don't use cpu_relax here. This is
- to make sure that the performance counter really ticks,
- even if there is a simulator or similar that catches the
- pause instruction. On a real HT machine this is fine because
- all other CPUs are busy with "useless" delay loops and don't
- care if they get somewhat less cycles. */
- while (endflag == 0)
- mb();
-}
-#endif
-
-int __init check_nmi_watchdog(void)
-{
- unsigned int *prev_nmi_count;
- int cpu;
-
- if ((nmi_watchdog == NMI_NONE) || (nmi_watchdog == NMI_DISABLED))
- return 0;
-
- if (!atomic_read(&nmi_active))
- return 0;
-
- prev_nmi_count = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL);
- if (!prev_nmi_count)
- goto error;
-
- printk(KERN_INFO "Testing NMI watchdog ... ");
-
-#ifdef CONFIG_SMP
- if (nmi_watchdog == NMI_LOCAL_APIC)
- smp_call_function(nmi_cpu_busy, (void *)&endflag, 0, 0);
-#endif
-
- for_each_possible_cpu(cpu)
- prev_nmi_count[cpu] = nmi_count(cpu);
- local_irq_enable();
- mdelay((20*1000)/nmi_hz); // wait 20 ticks
-
- for_each_possible_cpu(cpu) {
-#ifdef CONFIG_SMP
- /* Check cpu_callin_map here because that is set
- after the timer is started. */
- if (!cpu_isset(cpu, cpu_callin_map))
- continue;
-#endif
- if (!per_cpu(wd_enabled, cpu))
- continue;
- if (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],
- 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);
- goto error;
- }
- 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;
-error:
- if (nmi_watchdog == NMI_IO_APIC && !timer_through_8259)
- disable_8259A_irq(0);
- timer_ack = 0;
-
- return -1;
-}
-
-static int __init setup_nmi_watchdog(char *str)
-{
- int nmi;
-
- get_option(&str, &nmi);
-
- if ((nmi >= NMI_INVALID) || (nmi < NMI_NONE))
- return 0;
-
- nmi_watchdog = nmi;
- return 1;
-}
-
-__setup("nmi_watchdog=", setup_nmi_watchdog);
-
-
-/* Suspend/resume support */
-
-#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(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; /* enable it before to avoid race with handler */
- 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.
- *
- * since NMIs don't listen to _any_ locks, we have to be extremely
- * careful not to rely on unsafe variables. The printk might lock
- * up though, so we have to break up any console locks first ...
- * [when there will be more tty-related locks, break them up
- * here too!]
- */
-
-static unsigned int
- last_irq_sums [NR_CPUS],
- alert_counter [NR_CPUS];
-
-void touch_nmi_watchdog(void)
-{
- if (nmi_watchdog > 0) {
- unsigned cpu;
-
- /*
- * Just reset the alert counters, (other CPUs might be
- * spinning on locks we hold):
- */
- for_each_present_cpu(cpu) {
- if (alert_counter[cpu])
- alert_counter[cpu] = 0;
- }
- }
-
- /*
- * Tickle the softlockup detector too:
- */
- touch_softlockup_watchdog();
-}
-EXPORT_SYMBOL(touch_nmi_watchdog);
-
-extern void die_nmi(struct pt_regs *, const char *msg);
-
-notrace __kprobes int
-nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
-{
-
- /*
- * Since current_thread_info()-> is always on the stack, and we
- * always switch the stack NMI-atomically, it's safe to use
- * smp_processor_id().
- */
- 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;
- }
-
- 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);
- }
-
- /*
- * Take the local apic timer and PIT/HPET into account. We don't
- * know which one is active, when we have highres/dyntick on
- */
- sum = per_cpu(irq_stat, cpu).apic_timer_irqs +
- per_cpu(irq_stat, cpu).irq0_irqs;
-
- /* if the none of the timers isn't firing, this cpu isn't doing much */
- if (!touched && last_irq_sums[cpu] == sum) {
- /*
- * Ayiee, looks like this CPU is stuck ...
- * wait a few IRQs (5 seconds) before doing the oops ...
- */
- alert_counter[cpu]++;
- if (alert_counter[cpu] == 5*nmi_hz)
- /*
- * die_nmi will return ONLY if NOTIFY_STOP happens..
- */
- die_nmi(regs, "BUG: NMI Watchdog detected LOCKUP");
- } else {
- last_irq_sums[cpu] = sum;
- alert_counter[cpu] = 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(regs, buf);
- 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 == NMI_DEFAULT) {
- if (lapic_watchdog_ok())
- nmi_watchdog = NMI_LOCAL_APIC;
- else
- nmi_watchdog = NMI_IO_APIC;
- }
-
- 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);
static DEFINE_SPINLOCK(nmi_print_lock);
-void notrace __kprobes die_nmi(struct pt_regs *regs, const char *msg)
+void notrace __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
{
- if (notify_die(DIE_NMIWATCHDOG, msg, regs, 0, 2, SIGINT) == NOTIFY_STOP)
+ if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP)
return;
spin_lock(&nmi_print_lock);
* to get a message out:
*/
bust_spinlocks(1);
- printk(KERN_EMERG "%s", msg);
+ printk(KERN_EMERG "%s", str);
printk(" on CPU%d, ip %08lx, registers:\n",
smp_processor_id(), regs->ip);
show_registers(regs);
+ if (do_panic)
+ panic("Non maskable interrupt");
console_silent();
spin_unlock(&nmi_print_lock);
bust_spinlocks(0);
asmlinkage void machine_check(void);
asmlinkage void spurious_interrupt_bug(void);
+int panic_on_unrecovered_nmi;
static unsigned int code_bytes = 64;
+static unsigned ignore_nmis;
static inline void conditional_sti(struct pt_regs *regs)
{
* We are in trouble anyway, lets at least try
* to get a message out.
*/
- printk(str, smp_processor_id());
+ printk(KERN_EMERG "%s", str);
+ printk(" on CPU%d, ip %08lx, registers:\n",
+ smp_processor_id(), regs->ip);
show_registers(regs);
if (kexec_should_crash(current))
crash_kexec(regs);
io_check_error(reason, regs);
}
+asmlinkage notrace __kprobes void
+do_nmi(struct pt_regs *regs, long error_code)
+{
+ nmi_enter();
+ add_pda(__nmi_count, 1);
+ if (!ignore_nmis)
+ default_do_nmi(regs);
+ nmi_exit();
+}
+
+void stop_nmi(void)
+{
+ acpi_nmi_disable();
+ ignore_nmis++;
+}
+
+void restart_nmi(void)
+{
+ ignore_nmis--;
+ acpi_nmi_enable();
+}
+
/* runs on IST stack. */
asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
{
#ifdef CONFIG_X86_64
extern void default_do_nmi(struct pt_regs *);
-extern void die_nmi(char *str, struct pt_regs *regs, int do_panic);
-extern void nmi_watchdog_default(void);
-#else
-#define nmi_watchdog_default() do {} while (0)
#endif
+extern void die_nmi(char *str, struct pt_regs *regs, int do_panic);
+extern void nmi_watchdog_default(void);
extern int check_nmi_watchdog(void);
extern int nmi_watchdog_enabled;
extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
projects / linux-2.6-omap-h63xx.git / commitdiff