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thermal: trip: Trigger trip down notifications when trips involved in mitigation become invalid

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When a trip point becomes invalid after being crossed on the way up,
it is involved in a mitigation episode that needs to be adjusted to
compensate for the trip going away.

For this reason, introduce thermal_zone_trip_down() as a wrapper
around thermal_trip_crossed() and make thermal_zone_set_trip_temp()
call it if the new temperature of the trip at hand is equal to
THERMAL_TEMP_INVALID and it has been crossed on the way up to trigger
all of the necessary adjustments in user space, the thermal debug
code and the zone governor.

Fixes: 8c69a777e4 ("thermal: core: Fix the handling of invalid trip points")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2024-05-23 18:05:03 +02:00
parent cb573eec60
commit ae2170d6ea
3 changed files with 20 additions and 8 deletions
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6
drivers/thermal/thermal_core.c
View file

@ -602,6 +602,12 @@ void thermal_zone_device_update(struct thermal_zone_device *tz,
}
EXPORT_SYMBOL_GPL(thermal_zone_device_update);
void thermal_zone_trip_down(struct thermal_zone_device *tz,
const struct thermal_trip *trip)
{
thermal_trip_crossed(tz, trip, thermal_get_tz_governor(tz), false);
}
int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
void *data)
{

2
drivers/thermal/thermal_core.h
View file

@ -246,6 +246,8 @@ int thermal_zone_trip_id(const struct thermal_zone_device *tz,
void thermal_zone_trip_updated(struct thermal_zone_device *tz,
const struct thermal_trip *trip);
int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
void thermal_zone_trip_down(struct thermal_zone_device *tz,
const struct thermal_trip *trip);
/* sysfs I/F */
int thermal_zone_create_device_groups(struct thermal_zone_device *tz);

20
drivers/thermal/thermal_trip.c
View file

@ -152,17 +152,23 @@ void thermal_zone_set_trip_temp(struct thermal_zone_device *tz,
if (trip->temperature == temp)
return;
trip->temperature = temp;
thermal_notify_tz_trip_change(tz, trip);
if (temp == THERMAL_TEMP_INVALID) {
struct thermal_trip_desc *td = trip_to_trip_desc(trip);
if (trip->type == THERMAL_TRIP_PASSIVE &&
tz->temperature >= td->threshold) {
if (tz->temperature >= td->threshold) {
/*
* The trip has been crossed, so the thermal zone's
* passive count needs to be adjusted.
* The trip has been crossed on the way up, so some
* adjustments are needed to compensate for the lack
* of it going forward.
*/
tz->passive--;
WARN_ON_ONCE(tz->passive < 0);
if (trip->type == THERMAL_TRIP_PASSIVE) {
tz->passive--;
WARN_ON_ONCE(tz->passive < 0);
}
thermal_zone_trip_down(tz, trip);
}
/*
* Invalidate the threshold to avoid triggering a spurious
@ -170,7 +176,5 @@ void thermal_zone_set_trip_temp(struct thermal_zone_device *tz,
*/
td->threshold = INT_MAX;
}
trip->temperature = temp;
thermal_notify_tz_trip_change(tz, trip);
}
EXPORT_SYMBOL_GPL(thermal_zone_set_trip_temp);