diff options
Diffstat (limited to 'kernel/time/tick-common.c')
| -rw-r--r-- | kernel/time/tick-common.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c index 48167a6..c35d449 100644 --- a/kernel/time/tick-common.c +++ b/kernel/time/tick-common.c @@ -34,6 +34,16 @@ ktime_t tick_period; static int tick_do_timer_cpu = -1; DEFINE_SPINLOCK(tick_device_lock); +/** + * tick_is_oneshot_available - check for a oneshot capable event device + */ +int tick_is_oneshot_available(void) +{ + struct clock_event_device *dev = __get_cpu_var(tick_cpu_device).evtdev; + + return dev && (dev->features & CLOCK_EVT_FEAT_ONESHOT); +} + /* * Periodic tick */ @@ -162,6 +172,8 @@ static void tick_setup_device(struct tick_device *td, if (td->mode == TICKDEV_MODE_PERIODIC) tick_setup_periodic(newdev, 0); + else + tick_setup_oneshot(newdev, handler, next_event); } /* @@ -209,6 +221,12 @@ static int tick_check_new_device(struct clock_event_device *newdev) */ if (curdev) { /* + * Prefer one shot capable devices ! + */ + if ((curdev->features & CLOCK_EVT_FEAT_ONESHOT) && + !(newdev->features & CLOCK_EVT_FEAT_ONESHOT)) + goto out_bc; + /* * Check the rating */ if (curdev->rating >= newdev->rating) @@ -226,6 +244,8 @@ static int tick_check_new_device(struct clock_event_device *newdev) } clockevents_exchange_device(curdev, newdev); tick_setup_device(td, newdev, cpu, cpumask); + if (newdev->features & CLOCK_EVT_FEAT_ONESHOT) + tick_oneshot_notify(); spin_unlock_irqrestore(&tick_device_lock, flags); return NOTIFY_STOP; @@ -285,7 +305,13 @@ static int tick_notify(struct notifier_block *nb, unsigned long reason, tick_broadcast_on_off(reason, dev); break; + case CLOCK_EVT_NOTIFY_BROADCAST_ENTER: + case CLOCK_EVT_NOTIFY_BROADCAST_EXIT: + tick_broadcast_oneshot_control(reason); + break; + case CLOCK_EVT_NOTIFY_CPU_DEAD: + tick_shutdown_broadcast_oneshot(dev); tick_shutdown_broadcast(dev); tick_shutdown(dev); break; |
