/*
* proc handler for /proc/sys/kernel/nmi
*/
int proc_nmi_enabled(struct ctl_table *table, int write,
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, buffer, length, ppos);
if (!!old_state == !!nmi_watchdog_enabled)
return 0;
if (atomic_read(&nmi_active) < 0 || !nmi_watchdog_active()) {
printk(KERN_WARNING
"NMI watchdog is permanently disabled\n");
return -EIO;
}
if (nmi_watchdog == NMI_LOCAL_APIC) {
if (nmi_watchdog_enabled)
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");
return -EIO;
}
return 0;
}
int reserve_lapic_nmi(void)
{
if (!test_and_set_bit(1, &lapic_nmi_reserved)) {
if (nmi_watchdog == NMI_LOCAL_APIC)
disable_lapic_nmi_watchdog();
return 0;
}
return 1;
}
int reserve_lapic_nmi(void)
{
unsigned int old_owner;
spin_lock(&lapic_nmi_owner_lock);
old_owner = lapic_nmi_owner;
lapic_nmi_owner |= LAPIC_NMI_RESERVED;
spin_unlock(&lapic_nmi_owner_lock);
if (old_owner & LAPIC_NMI_RESERVED)
return -EBUSY;
if (old_owner & LAPIC_NMI_WATCHDOG)
disable_lapic_nmi_watchdog();
return 0;
}
/*
* proc handler for /proc/sys/kernel/unknown_nmi_panic
*/
int proc_unknown_nmi_panic(ctl_table *table, int write, struct file *file,
void __user *buffer, size_t *length, loff_t *ppos)
{
int old_state;
old_state = unknown_nmi_panic;
proc_dointvec(table, write, file, buffer, length, ppos);
if (!!old_state == !!unknown_nmi_panic)
return 0;
if (unknown_nmi_panic) {
if (nmi_watchdog == NMI_LOCAL_APIC)
disable_lapic_nmi_watchdog();
else if (nmi_watchdog == NMI_IO_APIC)
acpi_nmi_disable();
} else {
if (nmi_watchdog == NMI_LOCAL_APIC)
enable_lapic_nmi_watchdog();
else if (nmi_watchdog == NMI_IO_APIC)
acpi_nmi_enable();
}
return 0;
}
static int lapic_nmi_suspend(struct sys_device *dev, u32 state)
{
nmi_pm_active = nmi_active;
disable_lapic_nmi_watchdog();
return 0;
}
