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x86: C1E late detection fix. Really switch off lapic timer 

Doh, I completely missed that devices marked DUMMY are not running
the set_mode function. So we force broadcasting, but we keep the
local APIC timer running.

Let the clock event layer mark the device _after_ switching it off.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2007-10-17 18:04:32 +02:00 committed by Thomas Gleixner
parent e6d5a11dad
commit 3dfbc88464
2 changed files with 4 additions and 17 deletions
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3
arch/x86/kernel/apic_64.c
View File

@ -974,15 +974,12 @@ void __init setup_boot_APIC_clock (void)
*/
void __cpuinit check_boot_apic_timer_broadcast(void)
{
struct clock_event_device *levt = &per_cpu(lapic_events, boot_cpu_id);
if (!disable_apic_timer ||
(lapic_clockevent.features & CLOCK_EVT_FEAT_DUMMY))
return;
printk(KERN_INFO "AMD C1E detected late. Force timer broadcast.\n");
lapic_clockevent.features |= CLOCK_EVT_FEAT_DUMMY;
levt->features |= CLOCK_EVT_FEAT_DUMMY;
local_irq_enable();
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_FORCE, &boot_cpu_id);

16
kernel/time/tick-broadcast.c
View File

@ -222,20 +222,8 @@ static void tick_do_broadcast_on_off(void *why)
if (!dev || !(dev->features & CLOCK_EVT_FEAT_C3STOP))
goto out;
/*
* Defect device ?
*/
if (!tick_device_is_functional(dev)) {
/*
* AMD C1E wreckage fixup:
*
* Device was registered functional in the first
* place. Now the secondary CPU detected the C1E
* misfeature and notifies us to fix it up
*/
if (*reason != CLOCK_EVT_NOTIFY_BROADCAST_FORCE)
if (!tick_device_is_functional(dev))
goto out;
}
switch (*reason) {
case CLOCK_EVT_NOTIFY_BROADCAST_ON:
@ -246,6 +234,8 @@ static void tick_do_broadcast_on_off(void *why)
clockevents_set_mode(dev,
CLOCK_EVT_MODE_SHUTDOWN);
}
if (*reason == CLOCK_EVT_NOTIFY_BROADCAST_FORCE)
dev->features |= CLOCK_EVT_FEAT_DUMMY;
break;
case CLOCK_EVT_NOTIFY_BROADCAST_OFF:
if (cpu_isset(cpu, tick_broadcast_mask)) {