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Subject[PATCH v4 1/3] PM/runtime: Add a new interface to get accounted time
Date
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.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
---
drivers/base/power/runtime.c | 16 ++++++++++++++++
include/linux/pm_runtime.h | 2 ++
2 files changed, 18 insertions(+)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index beb85c3..e695544 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -86,6 +86,22 @@ 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.
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index f0fc470..d479707 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -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; }
--
2.7.4
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