drivers/thermal/gov_fair_share.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  *  fair_share.c - A simple weight based Thermal governor
24 		if (trip->temperature >= tz->temperature)  in get_trip_level()
36 	trace_thermal_zone_trip(tz, trip_level, level_trip->type);  in get_trip_level()
44 	return (long)(percentage * level * cdev->max_state) / (100 * tz->num_trips);  in get_target_state()
48  * fair_share_throttle - throttles devices associated with the given zone
53  * throttle state of the cooling devices associated with the given zone.
56  * P1. max_state: Maximum throttle state exposed by the cooling device.
58  *	How 'effective' the 'i'th device is, in cooling the given zone.
62  *	whereas the throttling is at full swing if we trip critical levels.
64  * new_state of cooling device = P3 * P2 * P1
74 	lockdep_assert_held(&tz->lock);  in fair_share_throttle()
76 	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {  in fair_share_throttle()
77 		if (instance->trip != trip)  in fair_share_throttle()
80 		total_weight += instance->weight;  in fair_share_throttle()
84 	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {  in fair_share_throttle()
86 		struct thermal_cooling_device *cdev = instance->cdev;  in fair_share_throttle()
88 		if (instance->trip != trip)  in fair_share_throttle()
94 			percentage = (instance->weight * 100) / total_weight;  in fair_share_throttle()
96 		instance->target = get_target_state(tz, cdev, percentage,  in fair_share_throttle()
99 		mutex_lock(&cdev->lock);  in fair_share_throttle()
101 		mutex_unlock(&cdev->lock);  in fair_share_throttle()