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 <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

1 files changed, 19 insertions, 0 deletions

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 */