6.8-stable review patch. If anyone has any objections, please let me know.
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From: Rafael J. Wysocki rafael.j.wysocki@intel.com
[ 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 --- drivers/thermal/thermal_core.c | 3 ++- drivers/thermal/thermal_debugfs.c | 7 ------- 2 files changed, 2 insertions(+), 8 deletions(-)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index dfaa6341694a0..1818901d37ca8 100644 --- 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 5693cc8b231aa..47ab95b3699e9 100644 --- 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);