forked from Minki/linux
5e85391b3b
On some configs the following build error triggers: arch/x86/kernel/apic/hw_nmi.c:35: error: 'apic' undeclared (first use in this function) arch/x86/kernel/apic/hw_nmi.c:35: error: (Each undeclared identifier is reported only once arch/x86/kernel/apic/hw_nmi.c:35: error: for each function it appears in.) Because asm/apic.h was only included implicitly. Include it explicitly. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Cyrill Gorcunov <gorcunov@gmail.com> LKML-Reference: <1273713674-8434-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
|
|
* HW NMI watchdog support
|
|
*
|
|
* started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
|
|
*
|
|
* Arch specific calls to support NMI watchdog
|
|
*
|
|
* Bits copied from original nmi.c file
|
|
*
|
|
*/
|
|
#include <asm/apic.h>
|
|
|
|
#include <linux/cpumask.h>
|
|
#include <linux/kdebug.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/kprobes.h>
|
|
#include <linux/nmi.h>
|
|
#include <linux/module.h>
|
|
|
|
/* For reliability, we're prepared to waste bits here. */
|
|
static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;
|
|
|
|
u64 hw_nmi_get_sample_period(void)
|
|
{
|
|
return (u64)(cpu_khz) * 1000 * 60;
|
|
}
|
|
|
|
#ifdef ARCH_HAS_NMI_WATCHDOG
|
|
void arch_trigger_all_cpu_backtrace(void)
|
|
{
|
|
int i;
|
|
|
|
cpumask_copy(to_cpumask(backtrace_mask), cpu_online_mask);
|
|
|
|
printk(KERN_INFO "sending NMI to all CPUs:\n");
|
|
apic->send_IPI_all(NMI_VECTOR);
|
|
|
|
/* Wait for up to 10 seconds for all CPUs to do the backtrace */
|
|
for (i = 0; i < 10 * 1000; i++) {
|
|
if (cpumask_empty(to_cpumask(backtrace_mask)))
|
|
break;
|
|
mdelay(1);
|
|
}
|
|
}
|
|
|
|
static int __kprobes
|
|
arch_trigger_all_cpu_backtrace_handler(struct notifier_block *self,
|
|
unsigned long cmd, void *__args)
|
|
{
|
|
struct die_args *args = __args;
|
|
struct pt_regs *regs;
|
|
int cpu = smp_processor_id();
|
|
|
|
switch (cmd) {
|
|
case DIE_NMI:
|
|
case DIE_NMI_IPI:
|
|
break;
|
|
|
|
default:
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
regs = args->regs;
|
|
|
|
if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
|
|
static arch_spinlock_t lock = __ARCH_SPIN_LOCK_UNLOCKED;
|
|
|
|
arch_spin_lock(&lock);
|
|
printk(KERN_WARNING "NMI backtrace for cpu %d\n", cpu);
|
|
show_regs(regs);
|
|
dump_stack();
|
|
arch_spin_unlock(&lock);
|
|
cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
|
|
return NOTIFY_STOP;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static __read_mostly struct notifier_block backtrace_notifier = {
|
|
.notifier_call = arch_trigger_all_cpu_backtrace_handler,
|
|
.next = NULL,
|
|
.priority = 1
|
|
};
|
|
|
|
static int __init register_trigger_all_cpu_backtrace(void)
|
|
{
|
|
register_die_notifier(&backtrace_notifier);
|
|
return 0;
|
|
}
|
|
early_initcall(register_trigger_all_cpu_backtrace);
|
|
#endif
|
|
|
|
/* STUB calls to mimic old nmi_watchdog behaviour */
|
|
#if defined(CONFIG_X86_LOCAL_APIC)
|
|
unsigned int nmi_watchdog = NMI_NONE;
|
|
EXPORT_SYMBOL(nmi_watchdog);
|
|
void acpi_nmi_enable(void) { return; }
|
|
void acpi_nmi_disable(void) { return; }
|
|
#endif
|
|
atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
|
|
EXPORT_SYMBOL(nmi_active);
|
|
int unknown_nmi_panic;
|
|
void cpu_nmi_set_wd_enabled(void) { return; }
|
|
void stop_apic_nmi_watchdog(void *unused) { return; }
|
|
void setup_apic_nmi_watchdog(void *unused) { return; }
|
|
int __init check_nmi_watchdog(void) { return 0; }
|