thermal/debugfs: Avoid excessive updates of trip point statistics

[ Upstream commit 0a293c77580581c4b058eb40287acadac6ffd14a ]

Since thermal_debug_update_temp() is called before invoking
thermal_debug_tz_trip_down() for the trips that were crossed by the
zone temperature on the way up, it updates the statistics for them
as though the current zone temperature was above the low temperature
of each of them.  However, if a given trip has just been crossed on the
way down, the zone temperature is in fact below its low temperature,
but this is handled by thermal_debug_tz_trip_down() running after the
update of the trip statistics.

The remedy is to call thermal_debug_update_temp() after
thermal_debug_tz_trip_down() has been invoked for all of the
trips in question, but then thermal_debug_tz_trip_up() needs to
be adjusted, so it does not update the statistics for the trips
that has just been crossed on the way up, as that will be taken
care of by thermal_debug_update_temp() down the road.

Modify the code accordingly.

Fixes: 7ef01f228c9f ("thermal/debugfs: Add thermal debugfs information for mitigation episodes")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index dfaa6341694a089d2ff1a1c61ee7e12efdfcdbdd..1818901d37ca82cba5ccdfdba3e9306445d2cef2 100644 (file)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -432,7 +432,6 @@ static void update_temperature(struct thermal_zone_device *tz)
        trace_thermal_temperature(tz);
 
        thermal_genl_sampling_temp(tz->id, temp);
-       thermal_debug_update_temp(tz);
 }
 
 static void thermal_zone_device_check(struct work_struct *work)
@@ -476,6 +475,8 @@ void __thermal_zone_device_update(struct thermal_zone_device *tz,
        for_each_trip(tz, trip)
                handle_thermal_trip(tz, trip);
 
+       thermal_debug_update_temp(tz);
+
        monitor_thermal_zone(tz);
 }
 

diff --git a/drivers/thermal/thermal_debugfs.c b/drivers/thermal/thermal_debugfs.c
index 5693cc8b231aacdcf0a90f363a89e15f7bcd93f8..47ab95b3699e9706a5869298eb9bffea7893fde2 100644 (file)
--- a/drivers/thermal/thermal_debugfs.c
+++ b/drivers/thermal/thermal_debugfs.c
@@ -555,7 +555,6 @@ void thermal_debug_tz_trip_up(struct thermal_zone_device *tz,
        struct tz_episode *tze;
        struct tz_debugfs *tz_dbg;
        struct thermal_debugfs *thermal_dbg = tz->debugfs;
-       int temperature = tz->temperature;
        int trip_id = thermal_zone_trip_id(tz, trip);
        ktime_t now = ktime_get();
 
@@ -624,12 +623,6 @@ void thermal_debug_tz_trip_up(struct thermal_zone_device *tz,
 
        tze = list_first_entry(&tz_dbg->tz_episodes, struct tz_episode, node);
        tze->trip_stats[trip_id].timestamp = now;
-       tze->trip_stats[trip_id].max = max(tze->trip_stats[trip_id].max, temperature);
-       tze->trip_stats[trip_id].min = min(tze->trip_stats[trip_id].min, temperature);
-       tze->trip_stats[trip_id].count++;
-       tze->trip_stats[trip_id].avg = tze->trip_stats[trip_id].avg +
-               (temperature - tze->trip_stats[trip_id].avg) /
-               tze->trip_stats[trip_id].count;
 
 unlock:
        mutex_unlock(&thermal_dbg->lock);