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PM-runtime: Add new interface to get accounted time 

Some drivers (like i915/drm) needs to get the accounted suspended time.
pm_runtime_suspended_time() will return the suspended accounted time
in ns unit.

Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Vincent Guittot 2018-12-21 11:33:54 +01:00 committed by Rafael J. Wysocki
parent 1c7fc5cbc3
commit 8a62ffe275
2 changed files with 17 additions and 0 deletions
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15
drivers/base/power/runtime.c
View File

@ -88,6 +88,21 @@ static void __update_runtime_status(struct device *dev, enum rpm_status status)
dev->power.runtime_status = status;
}
u64 pm_runtime_suspended_time(struct device *dev)
{
unsigned long flags, time;
spin_lock_irqsave(&dev->power.lock, flags);
update_pm_runtime_accounting(dev);
time = dev->power.suspended_jiffies;
spin_unlock_irqrestore(&dev->power.lock, flags);
return jiffies_to_nsecs(time);
}
EXPORT_SYMBOL_GPL(pm_runtime_suspended_time);
/**
* pm_runtime_deactivate_timer - Deactivate given device's suspend timer.
* @dev: Device to handle.

2
include/linux/pm_runtime.h
View File

@ -113,6 +113,8 @@ static inline bool pm_runtime_is_irq_safe(struct device *dev)
return dev->power.irq_safe;
}
extern u64 pm_runtime_suspended_time(struct device *dev);
#else /* !CONFIG_PM */
static inline bool queue_pm_work(struct work_struct *work) { return false; }