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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>
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@ -1006,8 +1006,10 @@ int __pm_runtime_idle(struct device *dev, int rpmflags)
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int retval;
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if (rpmflags & RPM_GET_PUT) {
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if (!atomic_dec_and_test(&dev->power.usage_count))
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if (!atomic_dec_and_test(&dev->power.usage_count)) {
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trace_rpm_usage_rcuidle(dev, rpmflags);
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return 0;
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}
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}
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might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
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@ -1038,8 +1040,10 @@ int __pm_runtime_suspend(struct device *dev, int rpmflags)
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int retval;
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if (rpmflags & RPM_GET_PUT) {
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if (!atomic_dec_and_test(&dev->power.usage_count))
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if (!atomic_dec_and_test(&dev->power.usage_count)) {
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trace_rpm_usage_rcuidle(dev, rpmflags);
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return 0;
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}
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}
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might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
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@ -1101,6 +1105,7 @@ int pm_runtime_get_if_in_use(struct device *dev)
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retval = dev->power.disable_depth > 0 ? -EINVAL :
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dev->power.runtime_status == RPM_ACTIVE
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&& atomic_inc_not_zero(&dev->power.usage_count);
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trace_rpm_usage_rcuidle(dev, 0);
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spin_unlock_irqrestore(&dev->power.lock, flags);
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return retval;
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}
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@ -1434,6 +1439,8 @@ void pm_runtime_allow(struct device *dev)
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dev->power.runtime_auto = true;
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if (atomic_dec_and_test(&dev->power.usage_count))
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rpm_idle(dev, RPM_AUTO | RPM_ASYNC);
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else
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trace_rpm_usage_rcuidle(dev, RPM_AUTO | RPM_ASYNC);
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out:
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spin_unlock_irq(&dev->power.lock);
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@ -1501,6 +1508,8 @@ static void update_autosuspend(struct device *dev, int old_delay, int old_use)
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if (!old_use || old_delay >= 0) {
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atomic_inc(&dev->power.usage_count);
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rpm_resume(dev, 0);
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} else {
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trace_rpm_usage_rcuidle(dev, 0);
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}
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}
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@ -74,6 +74,12 @@ DEFINE_EVENT(rpm_internal, rpm_idle,
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TP_ARGS(dev, flags)
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);
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DEFINE_EVENT(rpm_internal, rpm_usage,
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TP_PROTO(struct device *dev, int flags),
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TP_ARGS(dev, flags)
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);
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TRACE_EVENT(rpm_return_int,
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TP_PROTO(struct device *dev, unsigned long ip, int ret),
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