thermal: trace: Trace when a cooling device's state is updated

Introduce and use an event to trace when a cooling device's state is
updated. This is useful to follow the effect of governor decisions on
cooling devices.

Cc: Zhang Rui <[email protected]>
Cc: Eduardo Valentin <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Signed-off-by: Punit Agrawal <[email protected]>
Signed-off-by: Eduardo Valentin <[email protected]>

2 files changed, 20 insertions, 0 deletions

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 6b32391260a0..c74c78d28699 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1291,6 +1291,7 @@ void thermal_cdev_update(struct thermal_cooling_device *cdev)
 	mutex_unlock(&cdev->lock);
 	cdev->ops->set_cur_state(cdev, target);
 	cdev->updated = true;
+	trace_cdev_update(cdev, target);
 	dev_dbg(&cdev->device, "set to state %lu\n", target);
 }
 EXPORT_SYMBOL(thermal_cdev_update);
diff --git a/include/trace/events/thermal.h b/include/trace/events/thermal.h
index 8c5ca96eccd6..894a79ea0686 100644
--- a/include/trace/events/thermal.h
+++ b/include/trace/events/thermal.h
@@ -32,6 +32,25 @@ TRACE_EVENT(thermal_temperature,
 		__entry->temp)
 );
 
+TRACE_EVENT(cdev_update,
+
+	TP_PROTO(struct thermal_cooling_device *cdev, unsigned long target),
+
+	TP_ARGS(cdev, target),
+
+	TP_STRUCT__entry(
+		__string(type, cdev->type)
+		__field(unsigned long, target)
+	),
+
+	TP_fast_assign(
+		__assign_str(type, cdev->type);
+		__entry->target = target;
+	),
+
+	TP_printk("type=%s target=%lu", __get_str(type), __entry->target)
+);
+
 #endif /* _TRACE_THERMAL_H */
 
 /* This part must be outside protection */