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x86, NMI watchdog: add support to enable and disable IOAPIC NMI

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Impact: change/improve the way /proc/sys/kernel/nmi_watchdog works

This patch adds support to enable/disable IOAPIC NMI watchdog in runtime via
procfs.

Signed-off-by: Aristeu Rozanski <aris@redhat.com>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Aristeu Rozanski 2008-10-27 12:42:34 -04:00 committed by Ingo Molnar
parent f8d56f1771
commit 6f290b4e01
1 changed files with 25 additions and 0 deletions
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25
arch/x86/kernel/nmi.c
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@ -340,6 +340,8 @@ void stop_apic_nmi_watchdog(void *unused)
return;
if (nmi_watchdog == NMI_LOCAL_APIC)
lapic_watchdog_stop();
else
__acpi_nmi_disable(NULL);
__get_cpu_var(wd_enabled) = 0;
atomic_dec(&nmi_active);
}
@ -465,6 +467,24 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
#ifdef CONFIG_SYSCTL
static void enable_ioapic_nmi_watchdog_single(void *unused)
{
__get_cpu_var(wd_enabled) = 1;
atomic_inc(&nmi_active);
__acpi_nmi_enable(NULL);
}
static void enable_ioapic_nmi_watchdog(void)
{
on_each_cpu(enable_ioapic_nmi_watchdog_single, NULL, 1);
touch_nmi_watchdog();
}
static void disable_ioapic_nmi_watchdog(void)
{
on_each_cpu(stop_apic_nmi_watchdog, NULL, 1);
}
static int __init setup_unknown_nmi_panic(char *str)
{
unknown_nmi_panic = 1;
@ -507,6 +527,11 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file,
enable_lapic_nmi_watchdog();
else
disable_lapic_nmi_watchdog();
} else if (nmi_watchdog == NMI_IO_APIC) {
if (nmi_watchdog_enabled)
enable_ioapic_nmi_watchdog();
else
disable_ioapic_nmi_watchdog();
} else {
printk(KERN_WARNING
"NMI watchdog doesn't know what hardware to touch\n");