diff mbox series

PM-runtime: add tracepoints for usage_count changes

Message ID cb199a03895f8a11d9039209e6ac1cd92b1d1fb9.1578155207.git.mirq-linux@rere.qmqm.pl
State New
Headers show
Series PM-runtime: add tracepoints for usage_count changes | expand

Commit Message

Michał Mirosław Jan. 4, 2020, 4:27 p.m. UTC 
Add tracepoints to remaining places where device's power.usage_count
is changed. This helps debugging where and why autosuspend is prevented.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/base/power/runtime.c | 13 +++++++++++--
 include/trace/events/rpm.h   |  6 ++++++
 2 files changed, 17 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 48616f358854..16134a69bf6f 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1006,8 +1006,10 @@  int __pm_runtime_idle(struct device *dev, int rpmflags)
 	int retval;
 
 	if (rpmflags & RPM_GET_PUT) {
-		if (!atomic_dec_and_test(&dev->power.usage_count))
+		if (!atomic_dec_and_test(&dev->power.usage_count)) {
+			trace_rpm_usage_rcuidle(dev, rpmflags);
 			return 0;
+		}
 	}
 
 	might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
@@ -1038,8 +1040,10 @@  int __pm_runtime_suspend(struct device *dev, int rpmflags)
 	int retval;
 
 	if (rpmflags & RPM_GET_PUT) {
-		if (!atomic_dec_and_test(&dev->power.usage_count))
+		if (!atomic_dec_and_test(&dev->power.usage_count)) {
+			trace_rpm_usage_rcuidle(dev, rpmflags);
 			return 0;
+		}
 	}
 
 	might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
@@ -1101,6 +1105,7 @@  int pm_runtime_get_if_in_use(struct device *dev)
 	retval = dev->power.disable_depth > 0 ? -EINVAL :
 		dev->power.runtime_status == RPM_ACTIVE
 			&& atomic_inc_not_zero(&dev->power.usage_count);
+	trace_rpm_usage_rcuidle(dev, 0);
 	spin_unlock_irqrestore(&dev->power.lock, flags);
 	return retval;
 }
@@ -1434,6 +1439,8 @@  void pm_runtime_allow(struct device *dev)
 	dev->power.runtime_auto = true;
 	if (atomic_dec_and_test(&dev->power.usage_count))
 		rpm_idle(dev, RPM_AUTO | RPM_ASYNC);
+	else
+		trace_rpm_usage_rcuidle(dev, RPM_AUTO | RPM_ASYNC);
 
  out:
 	spin_unlock_irq(&dev->power.lock);
@@ -1501,6 +1508,8 @@  static void update_autosuspend(struct device *dev, int old_delay, int old_use)
 		if (!old_use || old_delay >= 0) {
 			atomic_inc(&dev->power.usage_count);
 			rpm_resume(dev, 0);
+		} else {
+			trace_rpm_usage_rcuidle(dev, 0);
 		}
 	}
 
diff --git a/include/trace/events/rpm.h b/include/trace/events/rpm.h
index 26927a560eab..3c716214dab1 100644
--- a/include/trace/events/rpm.h
+++ b/include/trace/events/rpm.h
@@ -74,6 +74,12 @@  DEFINE_EVENT(rpm_internal, rpm_idle,
 
 	TP_ARGS(dev, flags)
 );
+DEFINE_EVENT(rpm_internal, rpm_usage,
+
+	TP_PROTO(struct device *dev, int flags),
+
+	TP_ARGS(dev, flags)
+);
 
 TRACE_EVENT(rpm_return_int,
 	TP_PROTO(struct device *dev, unsigned long ip, int ret),