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[PATCH] x86_64: [PATCH] timer resume

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At resume time, TSC's value or something similar might be changed a lot
against suspend time. This could make system gets a very big lost ticks.
See http://bugzilla.kernel.org/show_bug.cgi?id=5825

Signed-off-by: Shaohua Li<shaohua.li@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Shaohua Li 2006-02-03 21:50:56 +01:00 committed by Linus Torvalds
parent 6f3814cd2f
commit 0dd2ea9af8
3 changed files with 18 additions and 0 deletions
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5
arch/x86_64/kernel/pmtimer.c
View File

@ -80,6 +80,11 @@ int pmtimer_mark_offset(void)
return lost - 1;
}
void pmtimer_resume(void)
{
last_pmtmr_tick = inl(pmtmr_ioport);
}
unsigned int do_gettimeoffset_pm(void)
{
u32 now, offset, delta = 0;

12
arch/x86_64/kernel/time.c
View File

@ -1047,9 +1047,21 @@ static int timer_resume(struct sys_device *dev)
write_seqlock_irqsave(&xtime_lock,flags);
xtime.tv_sec = sec;
xtime.tv_nsec = 0;
if (vxtime.mode == VXTIME_HPET) {
if (hpet_use_timer)
vxtime.last = hpet_readl(HPET_T0_CMP) - hpet_tick;
else
vxtime.last = hpet_readl(HPET_COUNTER);
#ifdef CONFIG_X86_PM_TIMER
} else if (vxtime.mode == VXTIME_PMTMR) {
pmtimer_resume();
#endif
} else
vxtime.last_tsc = get_cycles_sync();
write_sequnlock_irqrestore(&xtime_lock,flags);
jiffies += sleep_length;
wall_jiffies += sleep_length;
monotonic_base += sleep_length * (NSEC_PER_SEC/HZ);
touch_softlockup_watchdog();
return 0;
}

1
include/asm-x86_64/proto.h
View File

@ -41,6 +41,7 @@ extern void iommu_hole_init(void);
extern void time_init_gtod(void);
extern int pmtimer_mark_offset(void);
extern void pmtimer_resume(void);
extern unsigned int do_gettimeoffset_pm(void);
#ifdef CONFIG_X86_PM_TIMER
extern u32 pmtmr_ioport;