return per_cpu(tick_oneshot_wakeup_device, cpu);
}
+static void tick_oneshot_wakeup_handler(struct clock_event_device *wd)
+{
+ /*
+ * If we woke up early and the tick was reprogrammed in the
+ * meantime then this may be spurious but harmless.
+ */
+ tick_receive_broadcast();
+}
+
static bool tick_set_oneshot_wakeup_device(struct clock_event_device *newdev,
int cpu)
{
if (!try_module_get(newdev->owner))
return false;
+ newdev->event_handler = tick_oneshot_wakeup_handler;
set_device:
clockevents_exchange_device(curdev, newdev);
per_cpu(tick_oneshot_wakeup_device, cpu) = newdev;
return ret;
}
+static int tick_oneshot_wakeup_control(enum tick_broadcast_state state,
+ struct tick_device *td,
+ int cpu)
+{
+ struct clock_event_device *dev, *wd;
+
+ dev = td->evtdev;
+ if (td->mode != TICKDEV_MODE_ONESHOT)
+ return -EINVAL;
+
+ wd = tick_get_oneshot_wakeup_device(cpu);
+ if (!wd)
+ return -ENODEV;
+
+ switch (state) {
+ case TICK_BROADCAST_ENTER:
+ clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT_STOPPED);
+ clockevents_switch_state(wd, CLOCK_EVT_STATE_ONESHOT);
+ clockevents_program_event(wd, dev->next_event, 1);
+ break;
+ case TICK_BROADCAST_EXIT:
+ /* We may have transitioned to oneshot mode while idle */
+ if (clockevent_get_state(wd) != CLOCK_EVT_STATE_ONESHOT)
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
{
struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
int cpu = smp_processor_id();
+ if (!tick_oneshot_wakeup_control(state, td, cpu))
+ return 0;
+
if (tick_broadcast_device.evtdev)
return ___tick_broadcast_oneshot_control(state, td, cpu);
/*
- * If there is no broadcast device, tell the caller not
+ * If there is no broadcast or wakeup device, tell the caller not
* to go into deep idle.
*/
return -EBUSY;