}
EXPORT_SYMBOL_GPL(clockevent_delta2ns);
+static int __clockevents_set_state(struct clock_event_device *dev,
+ enum clock_event_state state)
+{
+ /* Transition with legacy set_mode() callback */
+ if (dev->set_mode) {
+ /* Legacy callback doesn't support new modes */
+ if (state > CLOCK_EVT_STATE_ONESHOT)
+ return -ENOSYS;
+ /*
+ * 'clock_event_state' and 'clock_event_mode' have 1-to-1
+ * mapping until *_ONESHOT, and so a simple cast will work.
+ */
+ dev->set_mode((enum clock_event_mode)state, dev);
+ dev->mode = (enum clock_event_mode)state;
+ return 0;
+ }
+
+ if (dev->features & CLOCK_EVT_FEAT_DUMMY)
+ return 0;
+
+ /* Transition with new state-specific callbacks */
+ switch (state) {
+ case CLOCK_EVT_STATE_DETACHED:
+ /*
+ * This is an internal state, which is guaranteed to go from
+ * SHUTDOWN to DETACHED. No driver interaction required.
+ */
+ return 0;
+
+ case CLOCK_EVT_STATE_SHUTDOWN:
+ return dev->set_state_shutdown(dev);
+
+ case CLOCK_EVT_STATE_PERIODIC:
+ /* Core internal bug */
+ if (!(dev->features & CLOCK_EVT_FEAT_PERIODIC))
+ return -ENOSYS;
+ return dev->set_state_periodic(dev);
+
+ case CLOCK_EVT_STATE_ONESHOT:
+ /* Core internal bug */
+ if (!(dev->features & CLOCK_EVT_FEAT_ONESHOT))
+ return -ENOSYS;
+ return dev->set_state_oneshot(dev);
+
+ default:
+ return -ENOSYS;
+ }
+}
+
/**
- * clockevents_set_mode - set the operating mode of a clock event device
+ * clockevents_set_state - set the operating state of a clock event device
* @dev: device to modify
- * @mode: new mode
+ * @state: new state
*
* Must be called with interrupts disabled !
*/
-void clockevents_set_mode(struct clock_event_device *dev,
- enum clock_event_mode mode)
+void clockevents_set_state(struct clock_event_device *dev,
+ enum clock_event_state state)
{
- if (dev->mode != mode) {
- dev->set_mode(mode, dev);
- dev->mode = mode;
+ if (dev->state != state) {
+ if (__clockevents_set_state(dev, state))
+ return;
+
+ dev->state = state;
/*
* A nsec2cyc multiplicator of 0 is invalid and we'd crash
* on it, so fix it up and emit a warning:
*/
- if (mode == CLOCK_EVT_MODE_ONESHOT) {
+ if (state == CLOCK_EVT_STATE_ONESHOT) {
if (unlikely(!dev->mult)) {
dev->mult = 1;
WARN_ON(1);
*/
void clockevents_shutdown(struct clock_event_device *dev)
{
- clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
+ clockevents_set_state(dev, CLOCK_EVT_STATE_SHUTDOWN);
dev->next_event.tv64 = KTIME_MAX;
}
+/**
+ * clockevents_tick_resume - Resume the tick device before using it again
+ * @dev: device to resume
+ */
+int clockevents_tick_resume(struct clock_event_device *dev)
+{
+ int ret = 0;
+
+ if (dev->set_mode) {
+ dev->set_mode(CLOCK_EVT_MODE_RESUME, dev);
+ dev->mode = CLOCK_EVT_MODE_RESUME;
+ } else if (dev->tick_resume) {
+ ret = dev->tick_resume(dev);
+ }
+
+ return ret;
+}
+
#ifdef CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST
/* Limit min_delta to a jiffie */
delta = dev->min_delta_ns;
dev->next_event = ktime_add_ns(ktime_get(), delta);
- if (dev->mode == CLOCK_EVT_MODE_SHUTDOWN)
+ if (dev->state == CLOCK_EVT_STATE_SHUTDOWN)
return 0;
dev->retries++;
delta = dev->min_delta_ns;
dev->next_event = ktime_add_ns(ktime_get(), delta);
- if (dev->mode == CLOCK_EVT_MODE_SHUTDOWN)
+ if (dev->state == CLOCK_EVT_STATE_SHUTDOWN)
return 0;
dev->retries++;
dev->next_event = expires;
- if (dev->mode == CLOCK_EVT_MODE_SHUTDOWN)
+ if (dev->state == CLOCK_EVT_STATE_SHUTDOWN)
return 0;
/* Shortcut for clockevent devices that can deal with ktime. */
struct clock_event_device *dev, *newdev = NULL;
list_for_each_entry(dev, &clockevent_devices, list) {
- if (dev == ced || dev->mode != CLOCK_EVT_MODE_UNUSED)
+ if (dev == ced || dev->state != CLOCK_EVT_STATE_DETACHED)
continue;
if (!tick_check_replacement(newdev, dev))
static int __clockevents_try_unbind(struct clock_event_device *ced, int cpu)
{
/* Fast track. Device is unused */
- if (ced->mode == CLOCK_EVT_MODE_UNUSED) {
+ if (ced->state == CLOCK_EVT_STATE_DETACHED) {
list_del_init(&ced->list);
return 0;
}
}
EXPORT_SYMBOL_GPL(clockevents_unbind_device);
+/* Sanity check of state transition callbacks */
+static int clockevents_sanity_check(struct clock_event_device *dev)
+{
+ /* Legacy set_mode() callback */
+ if (dev->set_mode) {
+ /* We shouldn't be supporting new modes now */
+ WARN_ON(dev->set_state_periodic || dev->set_state_oneshot ||
+ dev->set_state_shutdown || dev->tick_resume);
+
+ BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
+ return 0;
+ }
+
+ if (dev->features & CLOCK_EVT_FEAT_DUMMY)
+ return 0;
+
+ /* New state-specific callbacks */
+ if (!dev->set_state_shutdown)
+ return -EINVAL;
+
+ if ((dev->features & CLOCK_EVT_FEAT_PERIODIC) &&
+ !dev->set_state_periodic)
+ return -EINVAL;
+
+ if ((dev->features & CLOCK_EVT_FEAT_ONESHOT) &&
+ !dev->set_state_oneshot)
+ return -EINVAL;
+
+ return 0;
+}
+
/**
* clockevents_register_device - register a clock event device
* @dev: device to register
{
unsigned long flags;
- BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
+ BUG_ON(clockevents_sanity_check(dev));
+
+ /* Initialize state to DETACHED */
+ dev->state = CLOCK_EVT_STATE_DETACHED;
+
if (!dev->cpumask) {
WARN_ON(num_possible_cpus() > 1);
dev->cpumask = cpumask_of(smp_processor_id());
{
clockevents_config(dev, freq);
- if (dev->mode == CLOCK_EVT_MODE_ONESHOT)
+ if (dev->state == CLOCK_EVT_STATE_ONESHOT)
return clockevents_program_event(dev, dev->next_event, false);
- if (dev->mode == CLOCK_EVT_MODE_PERIODIC)
- dev->set_mode(CLOCK_EVT_MODE_PERIODIC, dev);
+ if (dev->state == CLOCK_EVT_STATE_PERIODIC)
+ return __clockevents_set_state(dev, CLOCK_EVT_STATE_PERIODIC);
return 0;
}
* @old: device to release (can be NULL)
* @new: device to request (can be NULL)
*
- * Called from the notifier chain. clockevents_lock is held already
+ * Called from various tick functions with clockevents_lock held and
+ * interrupts disabled.
*/
void clockevents_exchange_device(struct clock_event_device *old,
struct clock_event_device *new)
{
- unsigned long flags;
-
- local_irq_save(flags);
/*
* Caller releases a clock event device. We queue it into the
* released list and do a notify add later.
*/
if (old) {
module_put(old->owner);
- clockevents_set_mode(old, CLOCK_EVT_MODE_UNUSED);
+ clockevents_set_state(old, CLOCK_EVT_STATE_DETACHED);
list_del(&old->list);
list_add(&old->list, &clockevents_released);
}
if (new) {
- BUG_ON(new->mode != CLOCK_EVT_MODE_UNUSED);
+ BUG_ON(new->state != CLOCK_EVT_STATE_DETACHED);
clockevents_shutdown(new);
}
- local_irq_restore(flags);
}
/**
dev->resume(dev);
}
-#ifdef CONFIG_GENERIC_CLOCKEVENTS
+#ifdef CONFIG_HOTPLUG_CPU
/**
- * clockevents_notify - notification about relevant events
- * Returns 0 on success, any other value on error
+ * tick_cleanup_dead_cpu - Cleanup the tick and clockevents of a dead cpu
*/
-int clockevents_notify(unsigned long reason, void *arg)
+void tick_cleanup_dead_cpu(int cpu)
{
struct clock_event_device *dev, *tmp;
unsigned long flags;
- int cpu, ret = 0;
raw_spin_lock_irqsave(&clockevents_lock, flags);
- switch (reason) {
- case CLOCK_EVT_NOTIFY_BROADCAST_ON:
- case CLOCK_EVT_NOTIFY_BROADCAST_OFF:
- case CLOCK_EVT_NOTIFY_BROADCAST_FORCE:
- tick_broadcast_on_off(reason, arg);
- break;
-
- case CLOCK_EVT_NOTIFY_BROADCAST_ENTER:
- case CLOCK_EVT_NOTIFY_BROADCAST_EXIT:
- ret = tick_broadcast_oneshot_control(reason);
- break;
-
- case CLOCK_EVT_NOTIFY_CPU_DYING:
- tick_handover_do_timer(arg);
- break;
-
- case CLOCK_EVT_NOTIFY_SUSPEND:
- tick_suspend();
- tick_suspend_broadcast();
- break;
-
- case CLOCK_EVT_NOTIFY_RESUME:
- tick_resume();
- break;
-
- case CLOCK_EVT_NOTIFY_CPU_DEAD:
- tick_shutdown_broadcast_oneshot(arg);
- tick_shutdown_broadcast(arg);
- tick_shutdown(arg);
- /*
- * Unregister the clock event devices which were
- * released from the users in the notify chain.
- */
- list_for_each_entry_safe(dev, tmp, &clockevents_released, list)
+ tick_shutdown_broadcast_oneshot(cpu);
+ tick_shutdown_broadcast(cpu);
+ tick_shutdown(cpu);
+ /*
+ * Unregister the clock event devices which were
+ * released from the users in the notify chain.
+ */
+ list_for_each_entry_safe(dev, tmp, &clockevents_released, list)
+ list_del(&dev->list);
+ /*
+ * Now check whether the CPU has left unused per cpu devices
+ */
+ list_for_each_entry_safe(dev, tmp, &clockevent_devices, list) {
+ if (cpumask_test_cpu(cpu, dev->cpumask) &&
+ cpumask_weight(dev->cpumask) == 1 &&
+ !tick_is_broadcast_device(dev)) {
+ BUG_ON(dev->state != CLOCK_EVT_STATE_DETACHED);
list_del(&dev->list);
- /*
- * Now check whether the CPU has left unused per cpu devices
- */
- cpu = *((int *)arg);
- list_for_each_entry_safe(dev, tmp, &clockevent_devices, list) {
- if (cpumask_test_cpu(cpu, dev->cpumask) &&
- cpumask_weight(dev->cpumask) == 1 &&
- !tick_is_broadcast_device(dev)) {
- BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
- list_del(&dev->list);
- }
}
- break;
- default:
- break;
}
raw_spin_unlock_irqrestore(&clockevents_lock, flags);
- return ret;
}
-EXPORT_SYMBOL_GPL(clockevents_notify);
+#endif
#ifdef CONFIG_SYSFS
struct bus_type clockevents_subsys = {
}
device_initcall(clockevents_init_sysfs);
#endif /* SYSFS */
-
-#endif /* GENERIC_CLOCK_EVENTS */
projects / mirror_ubuntu-artful-kernel.git / blobdiff