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x86: sanity check APIC timer frequency 

Check the APIC timer calibration result for sanity. When the frequency
is out of range, issue a warning and disable the local APIC timer.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-01-30 13:33:04 +01:00 committed by Ingo Molnar
parent 387faedb1d
commit c2b84b30b8
2 changed files with 25 additions and 0 deletions
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13
arch/x86/kernel/apic_32.c
View File

@ -470,6 +470,19 @@ void __init setup_boot_APIC_clock(void)
local_apic_timer_verify_ok = 1;
/*
* Do a sanity check on the APIC calibration result
*/
if (calibration_result < (1000000 / HZ)) {
local_irq_enable();
printk(KERN_WARNING
"APIC frequency too slow, disabling apic timer\n");
/* No broadcast on UP ! */
if (num_possible_cpus() > 1)
setup_APIC_timer();
return;
}
/* We trust the pm timer based calibration */
if (!pm_referenced) {
apic_printk(APIC_VERBOSE, "... verify APIC timer\n");

12
arch/x86/kernel/apic_64.c
View File

@ -383,6 +383,18 @@ void __init setup_boot_APIC_clock(void)
printk(KERN_INFO "Using local APIC timer interrupts.\n");
calibrate_APIC_clock();
/*
* Do a sanity check on the APIC calibration result
*/
if (calibration_result < (1000000 / HZ)) {
printk(KERN_WARNING
"APIC frequency too slow, disabling apic timer\n");
/* No broadcast on UP ! */
if (num_possible_cpus() > 1)
setup_APIC_timer();
return;
}
/*
* If nmi_watchdog is set to IO_APIC, we need the
* PIT/HPET going. Otherwise register lapic as a dummy