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[PATCH] i386: Handle missing local APIC timer interrupts on C3 state

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Whenever we see that a CPU is capable of C3 (during ACPI cstate init), we
disable local APIC timer and switch to using a broadcast from external timer
interrupt (IRQ 0). This is needed because Intel CPUs stop the local
APIC timer in C3.  This is currently only enabled for Intel CPUs.

Patch below adds the code for i386 and also the ACPI hunk.

Signed-off-by: Venkatesh Pallipadi <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Venkatesh Pallipadi 2006-01-11 22:44:21 +01:00 • committed by Linus Torvalds
commit 6eb0a0fd05
4 changed files with 102 additions and 2 deletions
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15
drivers/acpi/processor_idle.c
View file

@ -843,6 +843,15 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
unsigned int i;
unsigned int working = 0;
#ifdef ARCH_APICTIMER_STOPS_ON_C3
struct cpuinfo_x86 *c = cpu_data + pr->id;
cpumask_t mask = cpumask_of_cpu(pr->id);
if (c->x86_vendor == X86_VENDOR_INTEL) {
on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1);
}
#endif
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
struct acpi_processor_cx *cx = &pr->power.states[i];
@ -857,6 +866,12 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
case ACPI_STATE_C3:
acpi_processor_power_verify_c3(pr, cx);
#ifdef ARCH_APICTIMER_STOPS_ON_C3
if (c->x86_vendor == X86_VENDOR_INTEL) {
on_each_cpu(switch_APIC_timer_to_ipi,
&mask, 1, 1);
}
#endif
break;
}