diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2007-03-06 07:25:42 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-06 17:30:24 (GMT) |
commit | 6321dd60c76b2e12383bc06046288b15397ed3a0 (patch) | |
tree | 4cea63e69ce4f6f5f7f94fc6905063efdde7974e /kernel | |
parent | c3442e296517aee733d62fc3fe03211598902c7d (diff) | |
download | linux-fsl-qoriq-6321dd60c76b2e12383bc06046288b15397ed3a0.tar.xz |
[PATCH] Save/restore periodic tick information over suspend/resume
The programming of periodic tick devices needs to be saved/restored
across suspend/resume - otherwise we might end up with a system coming
up that relies on getting a PIT (or HPET) interrupt, while those devices
default to 'no interrupts' after powerup. (To confuse things it worked
to a certain degree on some systems because the lapic gets initialized
as a side-effect of SMP bootup.)
This suspend / resume thing was dropped unintentionally during the
last-minute -mm code reshuffling.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/time/tick-broadcast.c | 36 | ||||
-rw-r--r-- | kernel/time/tick-common.c | 32 | ||||
-rw-r--r-- | kernel/time/tick-internal.h | 4 | ||||
-rw-r--r-- | kernel/timer.c | 6 |
4 files changed, 78 insertions, 0 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index 12b3efe..5567745 100644 --- a/kernel/time/tick-broadcast.c +++ b/kernel/time/tick-broadcast.c @@ -284,6 +284,42 @@ void tick_shutdown_broadcast(unsigned int *cpup) spin_unlock_irqrestore(&tick_broadcast_lock, flags); } +void tick_suspend_broadcast(void) +{ + struct clock_event_device *bc; + unsigned long flags; + + spin_lock_irqsave(&tick_broadcast_lock, flags); + + bc = tick_broadcast_device.evtdev; + if (bc && tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) + clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN); + + spin_unlock_irqrestore(&tick_broadcast_lock, flags); +} + +int tick_resume_broadcast(void) +{ + struct clock_event_device *bc; + unsigned long flags; + int broadcast = 0; + + spin_lock_irqsave(&tick_broadcast_lock, flags); + + bc = tick_broadcast_device.evtdev; + if (bc) { + if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC && + !cpus_empty(tick_broadcast_mask)) + tick_broadcast_start_periodic(bc); + + broadcast = cpu_isset(smp_processor_id(), tick_broadcast_mask); + } + spin_unlock_irqrestore(&tick_broadcast_lock, flags); + + return broadcast; +} + + #ifdef CONFIG_TICK_ONESHOT static cpumask_t tick_broadcast_oneshot_mask; diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c index 0986a2b..43ba1bd 100644 --- a/kernel/time/tick-common.c +++ b/kernel/time/tick-common.c @@ -298,6 +298,28 @@ static void tick_shutdown(unsigned int *cpup) spin_unlock_irqrestore(&tick_device_lock, flags); } +static void tick_suspend_periodic(void) +{ + struct tick_device *td = &__get_cpu_var(tick_cpu_device); + unsigned long flags; + + spin_lock_irqsave(&tick_device_lock, flags); + if (td->mode == TICKDEV_MODE_PERIODIC) + clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_SHUTDOWN); + spin_unlock_irqrestore(&tick_device_lock, flags); +} + +static void tick_resume_periodic(void) +{ + struct tick_device *td = &__get_cpu_var(tick_cpu_device); + unsigned long flags; + + spin_lock_irqsave(&tick_device_lock, flags); + if (td->mode == TICKDEV_MODE_PERIODIC) + tick_setup_periodic(td->evtdev, 0); + spin_unlock_irqrestore(&tick_device_lock, flags); +} + /* * Notification about clock event devices */ @@ -325,6 +347,16 @@ static int tick_notify(struct notifier_block *nb, unsigned long reason, tick_shutdown(dev); break; + case CLOCK_EVT_NOTIFY_SUSPEND: + tick_suspend_periodic(); + tick_suspend_broadcast(); + break; + + case CLOCK_EVT_NOTIFY_RESUME: + if (!tick_resume_broadcast()) + tick_resume_periodic(); + break; + default: break; } diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h index 54861a0..75890ef 100644 --- a/kernel/time/tick-internal.h +++ b/kernel/time/tick-internal.h @@ -67,6 +67,8 @@ extern int tick_check_broadcast_device(struct clock_event_device *dev); extern int tick_is_broadcast_device(struct clock_event_device *dev); extern void tick_broadcast_on_off(unsigned long reason, int *oncpu); extern void tick_shutdown_broadcast(unsigned int *cpup); +extern void tick_suspend_broadcast(void); +extern int tick_resume_broadcast(void); extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); @@ -90,6 +92,8 @@ static inline int tick_device_uses_broadcast(struct clock_event_device *dev, static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { } static inline void tick_shutdown_broadcast(unsigned int *cpup) { } +static inline void tick_suspend_broadcast(void) { } +static inline int tick_resume_broadcast(void) { return 0; } /* * Set the periodic handler in non broadcast mode diff --git a/kernel/timer.c b/kernel/timer.c index 8ad3842..ee0a2da 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -997,6 +997,9 @@ static int timekeeping_resume(struct sys_device *dev) write_sequnlock_irqrestore(&xtime_lock, flags); touch_softlockup_watchdog(); + + clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); + /* Resume hrtimers */ clock_was_set(); @@ -1011,6 +1014,9 @@ static int timekeeping_suspend(struct sys_device *dev, pm_message_t state) timekeeping_suspended = 1; timekeeping_suspend_time = read_persistent_clock(); write_sequnlock_irqrestore(&xtime_lock, flags); + + clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); + return 0; } |