diff options
author | Rafael J. Wysocki <rjw@sisk.pl> | 2012-05-11 21:15:09 +0200 |
---|---|---|
committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-05-11 21:15:09 +0200 |
commit | 351520a9ebfdf2f36cd97c1192f280e0ac7fdcfc (patch) | |
tree | 8f177d2c59be90ebcedc98ed508832a7ebbd7e0a /drivers/base/power | |
parent | e6d18093ea3d1d30a4de9e29cb1676c1f4b55147 (diff) | |
parent | 4e585d25e120f1eae0a3a8bf8f6ebc7692afec18 (diff) |
Merge branch 'pm-sleep'
* pm-sleep:
PM / Sleep: User space wakeup sources garbage collector Kconfig option
PM / Sleep: Make the limit of user space wakeup sources configurable
PM / Documentation: suspend-and-cpuhotplug.txt: Fix typo
PM / Sleep: Fix a mistake in a conditional in autosleep_store()
epoll: Add a flag, EPOLLWAKEUP, to prevent suspend while epoll events are ready
PM / Sleep: Add user space interface for manipulating wakeup sources, v3
PM / Sleep: Add "prevent autosleep time" statistics to wakeup sources
PM / Sleep: Implement opportunistic sleep, v2
PM / Sleep: Add wakeup_source_activate and wakeup_source_deactivate tracepoints
PM / Sleep: Change wakeup source statistics to follow Android
PM / Sleep: Use wait queue to signal "no wakeup events in progress"
PM / Sleep: Look for wakeup events in later stages of device suspend
PM / Hibernate: Hibernate/thaw fixes/improvements
Diffstat (limited to 'drivers/base/power')
-rw-r--r-- | drivers/base/power/main.c | 10 | ||||
-rw-r--r-- | drivers/base/power/sysfs.c | 54 | ||||
-rw-r--r-- | drivers/base/power/wakeup.c | 174 |
3 files changed, 179 insertions, 59 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index b462c0e341c..e0fb5b0435a 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -889,6 +889,11 @@ static int dpm_suspend_noirq(pm_message_t state) if (!list_empty(&dev->power.entry)) list_move(&dev->power.entry, &dpm_noirq_list); put_device(dev); + + if (pm_wakeup_pending()) { + error = -EBUSY; + break; + } } mutex_unlock(&dpm_list_mtx); if (error) @@ -962,6 +967,11 @@ static int dpm_suspend_late(pm_message_t state) if (!list_empty(&dev->power.entry)) list_move(&dev->power.entry, &dpm_late_early_list); put_device(dev); + + if (pm_wakeup_pending()) { + error = -EBUSY; + break; + } } mutex_unlock(&dpm_list_mtx); if (error) diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c index 95c12f6cb5b..48be2ad4dd2 100644 --- a/drivers/base/power/sysfs.c +++ b/drivers/base/power/sysfs.c @@ -314,22 +314,41 @@ static ssize_t wakeup_active_count_show(struct device *dev, static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL); -static ssize_t wakeup_hit_count_show(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t wakeup_abort_count_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + unsigned long count = 0; + bool enabled = false; + + spin_lock_irq(&dev->power.lock); + if (dev->power.wakeup) { + count = dev->power.wakeup->wakeup_count; + enabled = true; + } + spin_unlock_irq(&dev->power.lock); + return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n"); +} + +static DEVICE_ATTR(wakeup_abort_count, 0444, wakeup_abort_count_show, NULL); + +static ssize_t wakeup_expire_count_show(struct device *dev, + struct device_attribute *attr, + char *buf) { unsigned long count = 0; bool enabled = false; spin_lock_irq(&dev->power.lock); if (dev->power.wakeup) { - count = dev->power.wakeup->hit_count; + count = dev->power.wakeup->expire_count; enabled = true; } spin_unlock_irq(&dev->power.lock); return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n"); } -static DEVICE_ATTR(wakeup_hit_count, 0444, wakeup_hit_count_show, NULL); +static DEVICE_ATTR(wakeup_expire_count, 0444, wakeup_expire_count_show, NULL); static ssize_t wakeup_active_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -398,6 +417,27 @@ static ssize_t wakeup_last_time_show(struct device *dev, } static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL); + +#ifdef CONFIG_PM_AUTOSLEEP +static ssize_t wakeup_prevent_sleep_time_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + s64 msec = 0; + bool enabled = false; + + spin_lock_irq(&dev->power.lock); + if (dev->power.wakeup) { + msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time); + enabled = true; + } + spin_unlock_irq(&dev->power.lock); + return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n"); +} + +static DEVICE_ATTR(wakeup_prevent_sleep_time_ms, 0444, + wakeup_prevent_sleep_time_show, NULL); +#endif /* CONFIG_PM_AUTOSLEEP */ #endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_PM_ADVANCED_DEBUG @@ -486,11 +526,15 @@ static struct attribute *wakeup_attrs[] = { &dev_attr_wakeup.attr, &dev_attr_wakeup_count.attr, &dev_attr_wakeup_active_count.attr, - &dev_attr_wakeup_hit_count.attr, + &dev_attr_wakeup_abort_count.attr, + &dev_attr_wakeup_expire_count.attr, &dev_attr_wakeup_active.attr, &dev_attr_wakeup_total_time_ms.attr, &dev_attr_wakeup_max_time_ms.attr, &dev_attr_wakeup_last_time_ms.attr, +#ifdef CONFIG_PM_AUTOSLEEP + &dev_attr_wakeup_prevent_sleep_time_ms.attr, +#endif #endif NULL, }; diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index 2a3e581b8dc..cbb463b3a75 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -14,16 +14,15 @@ #include <linux/suspend.h> #include <linux/seq_file.h> #include <linux/debugfs.h> +#include <trace/events/power.h> #include "power.h" -#define TIMEOUT 100 - /* * If set, the suspend/hibernate code will abort transitions to a sleep state * if wakeup events are registered during or immediately before the transition. */ -bool events_check_enabled; +bool events_check_enabled __read_mostly; /* * Combined counters of registered wakeup events and wakeup events in progress. @@ -52,6 +51,8 @@ static void pm_wakeup_timer_fn(unsigned long data); static LIST_HEAD(wakeup_sources); +static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue); + /** * wakeup_source_prepare - Prepare a new wakeup source for initialization. * @ws: Wakeup source to prepare. @@ -132,6 +133,7 @@ void wakeup_source_add(struct wakeup_source *ws) spin_lock_init(&ws->lock); setup_timer(&ws->timer, pm_wakeup_timer_fn, (unsigned long)ws); ws->active = false; + ws->last_time = ktime_get(); spin_lock_irq(&events_lock); list_add_rcu(&ws->entry, &wakeup_sources); @@ -374,12 +376,33 @@ EXPORT_SYMBOL_GPL(device_set_wakeup_enable); */ static void wakeup_source_activate(struct wakeup_source *ws) { + unsigned int cec; + ws->active = true; ws->active_count++; ws->last_time = ktime_get(); + if (ws->autosleep_enabled) + ws->start_prevent_time = ws->last_time; /* Increment the counter of events in progress. */ - atomic_inc(&combined_event_count); + cec = atomic_inc_return(&combined_event_count); + + trace_wakeup_source_activate(ws->name, cec); +} + +/** + * wakeup_source_report_event - Report wakeup event using the given source. + * @ws: Wakeup source to report the event for. + */ +static void wakeup_source_report_event(struct wakeup_source *ws) +{ + ws->event_count++; + /* This is racy, but the counter is approximate anyway. */ + if (events_check_enabled) + ws->wakeup_count++; + + if (!ws->active) + wakeup_source_activate(ws); } /** @@ -397,10 +420,7 @@ void __pm_stay_awake(struct wakeup_source *ws) spin_lock_irqsave(&ws->lock, flags); - ws->event_count++; - if (!ws->active) - wakeup_source_activate(ws); - + wakeup_source_report_event(ws); del_timer(&ws->timer); ws->timer_expires = 0; @@ -432,6 +452,17 @@ void pm_stay_awake(struct device *dev) } EXPORT_SYMBOL_GPL(pm_stay_awake); +#ifdef CONFIG_PM_AUTOSLEEP +static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now) +{ + ktime_t delta = ktime_sub(now, ws->start_prevent_time); + ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta); +} +#else +static inline void update_prevent_sleep_time(struct wakeup_source *ws, + ktime_t now) {} +#endif + /** * wakup_source_deactivate - Mark given wakeup source as inactive. * @ws: Wakeup source to handle. @@ -442,6 +473,7 @@ EXPORT_SYMBOL_GPL(pm_stay_awake); */ static void wakeup_source_deactivate(struct wakeup_source *ws) { + unsigned int cnt, inpr, cec; ktime_t duration; ktime_t now; @@ -468,14 +500,23 @@ static void wakeup_source_deactivate(struct wakeup_source *ws) if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time)) ws->max_time = duration; + ws->last_time = now; del_timer(&ws->timer); ws->timer_expires = 0; + if (ws->autosleep_enabled) + update_prevent_sleep_time(ws, now); + /* * Increment the counter of registered wakeup events and decrement the * couter of wakeup events in progress simultaneously. */ - atomic_add(MAX_IN_PROGRESS, &combined_event_count); + cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count); + trace_wakeup_source_deactivate(ws->name, cec); + + split_counters(&cnt, &inpr); + if (!inpr && waitqueue_active(&wakeup_count_wait_queue)) + wake_up(&wakeup_count_wait_queue); } /** @@ -536,8 +577,10 @@ static void pm_wakeup_timer_fn(unsigned long data) spin_lock_irqsave(&ws->lock, flags); if (ws->active && ws->timer_expires - && time_after_eq(jiffies, ws->timer_expires)) + && time_after_eq(jiffies, ws->timer_expires)) { wakeup_source_deactivate(ws); + ws->expire_count++; + } spin_unlock_irqrestore(&ws->lock, flags); } @@ -564,9 +607,7 @@ void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec) spin_lock_irqsave(&ws->lock, flags); - ws->event_count++; - if (!ws->active) - wakeup_source_activate(ws); + wakeup_source_report_event(ws); if (!msec) { wakeup_source_deactivate(ws); @@ -609,24 +650,6 @@ void pm_wakeup_event(struct device *dev, unsigned int msec) EXPORT_SYMBOL_GPL(pm_wakeup_event); /** - * pm_wakeup_update_hit_counts - Update hit counts of all active wakeup sources. - */ -static void pm_wakeup_update_hit_counts(void) -{ - unsigned long flags; - struct wakeup_source *ws; - - rcu_read_lock(); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { - spin_lock_irqsave(&ws->lock, flags); - if (ws->active) - ws->hit_count++; - spin_unlock_irqrestore(&ws->lock, flags); - } - rcu_read_unlock(); -} - -/** * pm_wakeup_pending - Check if power transition in progress should be aborted. * * Compare the current number of registered wakeup events with its preserved @@ -648,32 +671,38 @@ bool pm_wakeup_pending(void) events_check_enabled = !ret; } spin_unlock_irqrestore(&events_lock, flags); - if (ret) - pm_wakeup_update_hit_counts(); return ret; } /** * pm_get_wakeup_count - Read the number of registered wakeup events. * @count: Address to store the value at. + * @block: Whether or not to block. * - * Store the number of registered wakeup events at the address in @count. Block - * if the current number of wakeup events being processed is nonzero. + * Store the number of registered wakeup events at the address in @count. If + * @block is set, block until the current number of wakeup events being + * processed is zero. * - * Return 'false' if the wait for the number of wakeup events being processed to - * drop down to zero has been interrupted by a signal (and the current number - * of wakeup events being processed is still nonzero). Otherwise return 'true'. + * Return 'false' if the current number of wakeup events being processed is + * nonzero. Otherwise return 'true'. */ -bool pm_get_wakeup_count(unsigned int *count) +bool pm_get_wakeup_count(unsigned int *count, bool block) { unsigned int cnt, inpr; - for (;;) { - split_counters(&cnt, &inpr); - if (inpr == 0 || signal_pending(current)) - break; - pm_wakeup_update_hit_counts(); - schedule_timeout_interruptible(msecs_to_jiffies(TIMEOUT)); + if (block) { + DEFINE_WAIT(wait); + + for (;;) { + prepare_to_wait(&wakeup_count_wait_queue, &wait, + TASK_INTERRUPTIBLE); + split_counters(&cnt, &inpr); + if (inpr == 0 || signal_pending(current)) + break; + + schedule(); + } + finish_wait(&wakeup_count_wait_queue, &wait); } split_counters(&cnt, &inpr); @@ -703,11 +732,37 @@ bool pm_save_wakeup_count(unsigned int count) events_check_enabled = true; } spin_unlock_irq(&events_lock); - if (!events_check_enabled) - pm_wakeup_update_hit_counts(); return events_check_enabled; } +#ifdef CONFIG_PM_AUTOSLEEP +/** + * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources. + * @enabled: Whether to set or to clear the autosleep_enabled flags. + */ +void pm_wakep_autosleep_enabled(bool set) +{ + struct wakeup_source *ws; + ktime_t now = ktime_get(); + + rcu_read_lock(); + list_for_each_entry_rcu(ws, &wakeup_sources, entry) { + spin_lock_irq(&ws->lock); + if (ws->autosleep_enabled != set) { + ws->autosleep_enabled = set; + if (ws->active) { + if (set) + ws->start_prevent_time = now; + else + update_prevent_sleep_time(ws, now); + } + } + spin_unlock_irq(&ws->lock); + } + rcu_read_unlock(); +} +#endif /* CONFIG_PM_AUTOSLEEP */ + static struct dentry *wakeup_sources_stats_dentry; /** @@ -723,27 +778,37 @@ static int print_wakeup_source_stats(struct seq_file *m, ktime_t max_time; unsigned long active_count; ktime_t active_time; + ktime_t prevent_sleep_time; int ret; spin_lock_irqsave(&ws->lock, flags); total_time = ws->total_time; max_time = ws->max_time; + prevent_sleep_time = ws->prevent_sleep_time; active_count = ws->active_count; if (ws->active) { - active_time = ktime_sub(ktime_get(), ws->last_time); + ktime_t now = ktime_get(); + + active_time = ktime_sub(now, ws->last_time); total_time = ktime_add(total_time, active_time); if (active_time.tv64 > max_time.tv64) max_time = active_time; + + if (ws->autosleep_enabled) + prevent_sleep_time = ktime_add(prevent_sleep_time, + ktime_sub(now, ws->start_prevent_time)); } else { active_time = ktime_set(0, 0); } - ret = seq_printf(m, "%-12s\t%lu\t\t%lu\t\t%lu\t\t" - "%lld\t\t%lld\t\t%lld\t\t%lld\n", - ws->name, active_count, ws->event_count, ws->hit_count, + ret = seq_printf(m, "%-12s\t%lu\t\t%lu\t\t%lu\t\t%lu\t\t" + "%lld\t\t%lld\t\t%lld\t\t%lld\t\t%lld\n", + ws->name, active_count, ws->event_count, + ws->wakeup_count, ws->expire_count, ktime_to_ms(active_time), ktime_to_ms(total_time), - ktime_to_ms(max_time), ktime_to_ms(ws->last_time)); + ktime_to_ms(max_time), ktime_to_ms(ws->last_time), + ktime_to_ms(prevent_sleep_time)); spin_unlock_irqrestore(&ws->lock, flags); @@ -758,8 +823,9 @@ static int wakeup_sources_stats_show(struct seq_file *m, void *unused) { struct wakeup_source *ws; - seq_puts(m, "name\t\tactive_count\tevent_count\thit_count\t" - "active_since\ttotal_time\tmax_time\tlast_change\n"); + seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t" + "expire_count\tactive_since\ttotal_time\tmax_time\t" + "last_change\tprevent_suspend_time\n"); rcu_read_lock(); list_for_each_entry_rcu(ws, &wakeup_sources, entry) |