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authorMichał Mirosław <mirq-linux@rere.qmqm.pl>2020-01-04 17:27:57 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-01-13 12:28:29 +0100
commitd229290689ae0f6eae068ef142de4fd61ab4ba50 (patch)
tree48acc5874c22883b98b22933b5c7a182df269943 /drivers/base/power
parentb3a987b0264d3ddbb24293ebff10eddfc472f653 (diff)
downloadlinux-stericsson-d229290689ae0f6eae068ef142de4fd61ab4ba50.tar.gz
PM-runtime: add tracepoints for usage_count changes
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> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base/power')
-rw-r--r--drivers/base/power/runtime.c13
1 files changed, 11 insertions, 2 deletions
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);
}
}