thermal/debugfs: Do not extend mitigation episodes beyond system resume

Because thermal zone handling by the thermal core is started from
scratch during resume from system-wide suspend, prevent the debug
code from extending mitigation episodes beyond that point by ending
the mitigation episode currently in progress, if any, for each thermal
zone.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Author: rafaeljw

drivers/thermal/thermal_core.c

@@ -1648,6 +1648,7 @@ static void thermal_zone_device_resume(struct work_struct *work)
 
 	tz->suspended = false;
 
+	thermal_debug_tz_resume(tz);
 	thermal_zone_device_init(tz);
 	__thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 

drivers/thermal/thermal_debugfs.c

@@ -926,3 +926,39 @@ void thermal_debug_tz_remove(struct thermal_zone_device *tz)
 	thermal_debugfs_remove_id(thermal_dbg);
 	kfree(trips_crossed);
 }
+
+void thermal_debug_tz_resume(struct thermal_zone_device *tz)
+{
+	struct thermal_debugfs *thermal_dbg = tz->debugfs;
+	ktime_t now = ktime_get();
+	struct tz_debugfs *tz_dbg;
+	struct tz_episode *tze;
+	int i;
+
+	if (!thermal_dbg)
+		return;
+
+	mutex_lock(&thermal_dbg->lock);
+
+	tz_dbg = &thermal_dbg->tz_dbg;
+
+	if (!tz_dbg->nr_trips)
+		goto out;
+
+	/*
+	 * A mitigation episode was in progress before the preceding system
+	 * suspend transition, so close it because the zone handling is starting
+	 * over from scratch.
+	 */
+	tze = list_first_entry(&tz_dbg->tz_episodes, struct tz_episode, node);
+
+	for (i = 0; i < tz_dbg->nr_trips; i++)
+		tz_episode_close_trip(tze, tz_dbg->trips_crossed[i], now);
+
+	tze->duration = ktime_sub(now, tze->timestamp);
+
+	tz_dbg->nr_trips = 0;
+
+out:
+	mutex_unlock(&thermal_dbg->lock);
+}

drivers/thermal/thermal_debugfs.h

@@ -7,6 +7,7 @@ void thermal_debug_cdev_remove(struct thermal_cooling_device *cdev);
 void thermal_debug_cdev_state_update(const struct thermal_cooling_device *cdev, int state);
 void thermal_debug_tz_add(struct thermal_zone_device *tz);
 void thermal_debug_tz_remove(struct thermal_zone_device *tz);
+void thermal_debug_tz_resume(struct thermal_zone_device *tz);
 void thermal_debug_tz_trip_up(struct thermal_zone_device *tz,
 			      const struct thermal_trip *trip);
 void thermal_debug_tz_trip_down(struct thermal_zone_device *tz,
@@ -20,6 +21,7 @@ static inline void thermal_debug_cdev_state_update(const struct thermal_cooling_
 						   int state) {}
 static inline void thermal_debug_tz_add(struct thermal_zone_device *tz) {}
 static inline void thermal_debug_tz_remove(struct thermal_zone_device *tz) {}
+static inline void thermal_debug_tz_resume(struct thermal_zone_device *tz) {}
 static inline void thermal_debug_tz_trip_up(struct thermal_zone_device *tz,
 					    const struct thermal_trip *trip) {};
 static inline void thermal_debug_tz_trip_down(struct thermal_zone_device *tz,