Commit 074037ec authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / Wakeup: Introduce wakeup source objects and event statistics (v3) 



Introduce struct wakeup_source for representing system wakeup sources
within the kernel and for collecting statistics related to them.
Make the recently introduced helper functions pm_wakeup_event(),
pm_stay_awake() and pm_relax() use struct wakeup_source objects
internally, so that wakeup statistics associated with wakeup devices
can be collected and reported in a consistent way (the definition of
pm_relax() is changed, which is harmless, because this function is
not called directly by anyone yet).  Introduce new wakeup-related
sysfs device attributes in /sys/devices/.../power for reporting the
device wakeup statistics.

Change the global wakeup events counters event_count and
events_in_progress into atomic variables, so that it is not necessary
to acquire a global spinlock in pm_wakeup_event(), pm_stay_awake()
and pm_relax(), which should allow us to avoid lock contention in
these functions on SMP systems with many wakeup devices.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 0702d9ee

Documentation/ABI/testing/sysfs-devices-power

+70 −0
Original line number Diff line number Diff line
@@ -77,3 +77,73 @@ Description: 
		devices this attribute is set to "enabled" by bus type code or

		device drivers and in that cases it should be safe to leave the

		default value.



What:		/sys/devices/.../power/wakeup_count

Date:		September 2010

Contact:	Rafael J. Wysocki <rjw@sisk.pl>

Description:

		The /sys/devices/.../wakeup_count attribute contains the number

		of signaled wakeup events associated with the device.  This

		attribute is read-only.  If the device is not enabled to wake up

		the system from sleep states, this attribute is empty.



What:		/sys/devices/.../power/wakeup_active_count

Date:		September 2010

Contact:	Rafael J. Wysocki <rjw@sisk.pl>

Description:

		The /sys/devices/.../wakeup_active_count attribute contains the

		number of times the processing of wakeup events associated with

		the device was completed (at the kernel level).  This attribute

		is read-only.  If the device is not enabled to wake up the

		system from sleep states, this attribute is empty.



What:		/sys/devices/.../power/wakeup_hit_count

Date:		September 2010

Contact:	Rafael J. Wysocki <rjw@sisk.pl>

Description:

		The /sys/devices/.../wakeup_hit_count attribute contains the

		number of times the processing of a wakeup event associated with

		the device might prevent the system from entering a sleep state.

		This attribute is read-only.  If the device is not enabled to

		wake up the system from sleep states, this attribute is empty.



What:		/sys/devices/.../power/wakeup_active

Date:		September 2010

Contact:	Rafael J. Wysocki <rjw@sisk.pl>

Description:

		The /sys/devices/.../wakeup_active attribute contains either 1,

		or 0, depending on whether or not a wakeup event associated with

		the device is being processed (1).  This attribute is read-only.

		If the device is not enabled to wake up the system from sleep

		states, this attribute is empty.



What:		/sys/devices/.../power/wakeup_total_time_ms

Date:		September 2010

Contact:	Rafael J. Wysocki <rjw@sisk.pl>

Description:

		The /sys/devices/.../wakeup_total_time_ms attribute contains

		the total time of processing wakeup events associated with the

		device, in milliseconds.  This attribute is read-only.  If the

		device is not enabled to wake up the system from sleep states,

		this attribute is empty.



What:		/sys/devices/.../power/wakeup_max_time_ms

Date:		September 2010

Contact:	Rafael J. Wysocki <rjw@sisk.pl>

Description:

		The /sys/devices/.../wakeup_max_time_ms attribute contains

		the maximum time of processing a single wakeup event associated

		with the device, in milliseconds.  This attribute is read-only.

		If the device is not enabled to wake up the system from sleep

		states, this attribute is empty.



What:		/sys/devices/.../power/wakeup_last_time_ms

Date:		September 2010

Contact:	Rafael J. Wysocki <rjw@sisk.pl>

Description:

		The /sys/devices/.../wakeup_last_time_ms attribute contains

		the value of the monotonic clock corresponding to the time of

		signaling the last wakeup event associated with the device, in

		milliseconds.  This attribute is read-only.  If the device is

		not enabled to wake up the system from sleep states, this

		attribute is empty.

drivers/base/power/main.c

+3 −1
Original line number Diff line number Diff line
@@ -60,7 +60,8 @@ void device_pm_init(struct device *dev) 
	dev->power.status = DPM_ON;

	init_completion(&dev->power.completion);

	complete_all(&dev->power.completion);

	dev->power.wakeup_count = 0;

	dev->power.wakeup = NULL;

	spin_lock_init(&dev->power.lock);

	pm_runtime_init(dev);

}
@@ -120,6 +121,7 @@ void device_pm_remove(struct device *dev) 
	mutex_lock(&dpm_list_mtx);

	list_del_init(&dev->power.entry);

	mutex_unlock(&dpm_list_mtx);

	device_wakeup_disable(dev);

	pm_runtime_remove(dev);

}

drivers/base/power/power.h

+1 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ extern void device_pm_move_last(struct device *); 


static inline void device_pm_init(struct device *dev)

{

	spin_lock_init(&dev->power.lock);

	pm_runtime_init(dev);

}

drivers/base/power/runtime.c

+0 −2
Original line number Diff line number Diff line
@@ -1099,8 +1099,6 @@ EXPORT_SYMBOL_GPL(pm_runtime_allow); 
 */

void pm_runtime_init(struct device *dev)

{

	spin_lock_init(&dev->power.lock);



	dev->power.runtime_status = RPM_SUSPENDED;

	dev->power.idle_notification = false;

drivers/base/power/sysfs.c

+119 −2
Original line number Diff line number Diff line
@@ -210,11 +210,122 @@ static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store); 
static ssize_t wakeup_count_show(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	return sprintf(buf, "%lu\n", dev->power.wakeup_count);

	unsigned long count = 0;

	bool enabled = false;



	spin_lock_irq(&dev->power.lock);

	if (dev->power.wakeup) {

		count = dev->power.wakeup->event_count;

		enabled = true;

	}

	spin_unlock_irq(&dev->power.lock);

	return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");

}



static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);

#endif



static ssize_t wakeup_active_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->active_count;

		enabled = true;

	}

	spin_unlock_irq(&dev->power.lock);

	return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");

}



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)

{

	unsigned long count = 0;

	bool enabled = false;



	spin_lock_irq(&dev->power.lock);

	if (dev->power.wakeup) {

		count = dev->power.wakeup->hit_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 ssize_t wakeup_active_show(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	unsigned int active = 0;

	bool enabled = false;



	spin_lock_irq(&dev->power.lock);

	if (dev->power.wakeup) {

		active = dev->power.wakeup->active;

		enabled = true;

	}

	spin_unlock_irq(&dev->power.lock);

	return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");

}



static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);



static ssize_t wakeup_total_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->total_time);

		enabled = true;

	}

	spin_unlock_irq(&dev->power.lock);

	return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");

}



static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);



static ssize_t wakeup_max_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->max_time);

		enabled = true;

	}

	spin_unlock_irq(&dev->power.lock);

	return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");

}



static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);



static ssize_t wakeup_last_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->last_time);

		enabled = true;

	}

	spin_unlock_irq(&dev->power.lock);

	return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");

}



static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);

#endif /* CONFIG_PM_SLEEP */



#ifdef CONFIG_PM_ADVANCED_DEBUG

#ifdef CONFIG_PM_RUNTIME
@@ -288,6 +399,12 @@ static struct attribute * power_attrs[] = { 
	&dev_attr_wakeup.attr,

#ifdef CONFIG_PM_SLEEP

	&dev_attr_wakeup_count.attr,

	&dev_attr_wakeup_active_count.attr,

	&dev_attr_wakeup_hit_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,

#endif

#ifdef CONFIG_PM_ADVANCED_DEBUG

	&dev_attr_async.attr,

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