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: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index db67719..7ae6fe4 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -60,7 +60,8 @@
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 @@
mutex_lock(&dpm_list_mtx);
list_del_init(&dev->power.entry);
mutex_unlock(&dpm_list_mtx);
+ device_wakeup_disable(dev);
pm_runtime_remove(dev);
}