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| author | Shaohua Li <shaohua.li@intel.com> | 2006-02-03 21:50:56 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-04 16:43:13 -0800 |
| commit | 0dd2ea9af8f0eca43cf6200baa182b3aba307049 (patch) | |
| tree | 68d19724e9c50e14ea7d900493a9af37ff26c948 | |
| parent | 6f3814cd2fb5ea4d53a7fa5b0635d68fa4036c1b (diff) | |
| download | linux-0dd2ea9af8f0eca43cf6200baa182b3aba307049.tar.gz | |
[PATCH] x86_64: [PATCH] timer resume
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>
| -rw-r--r-- | arch/x86_64/kernel/pmtimer.c | 5 | ||||
| -rw-r--r-- | arch/x86_64/kernel/time.c | 12 | ||||
| -rw-r--r-- | include/asm-x86_64/proto.h | 1 |
3 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/pmtimer.c b/arch/x86_64/kernel/pmtimer.c index feb5f108dd26e8..8b2655ae4e61cb 100644 --- a/arch/x86_64/kernel/pmtimer.c +++ b/arch/x86_64/kernel/pmtimer.c @@ -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; diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c index 91a448a86ebd7d..c1f76055b57804 100644 --- a/arch/x86_64/kernel/time.c +++ b/arch/x86_64/kernel/time.c @@ -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; } diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h index c1e2307445d478..a6748b9568fef2 100644 --- a/include/asm-x86_64/proto.h +++ b/include/asm-x86_64/proto.h @@ -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; |