drivers/thermal/gov_fair_share.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  *  fair_share.c - A simple weight based Thermal governor
22 	int trip_level = -1;  in get_trip_level()
25 		if (td->threshold > tz->temperature)  in get_trip_level()
30 		if (!level_td || td->threshold > level_td->threshold)  in get_trip_level()
38 	trace_thermal_zone_trip(tz, thermal_zone_trip_id(tz, &level_td->trip),  in get_trip_level()
39 				level_td->trip.type);  in get_trip_level()
45  * fair_share_throttle - throttles devices associated with the given zone
51  * throttle state of the cooling devices associated with the given zone.
54  * P1. max_state: Maximum throttle state exposed by the cooling device.
56  *	How 'effective' the 'i'th device is, in cooling the given zone.
60  *	whereas the throttling is at full swing if we trip critical levels.
61  * new_state of cooling device = P3 * P2 * P1
71 	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {  in fair_share_throttle()
72 		if (instance->trip != trip)  in fair_share_throttle()
75 		total_weight += instance->weight;  in fair_share_throttle()
79 	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {  in fair_share_throttle()
80 		struct thermal_cooling_device *cdev = instance->cdev;  in fair_share_throttle()
84 		if (instance->trip != trip)  in fair_share_throttle()
88 		dividend *= cdev->max_state;  in fair_share_throttle()
89 		divisor = tz->num_trips;  in fair_share_throttle()
91 			dividend *= instance->weight;  in fair_share_throttle()
96 		instance->target = div_u64(dividend, divisor);  in fair_share_throttle()
98 		mutex_lock(&cdev->lock);  in fair_share_throttle()
100 		mutex_unlock(&cdev->lock);  in fair_share_throttle()
109 	lockdep_assert_held(&tz->lock);  in fair_share_manage()
112 		const struct thermal_trip *trip = &td->trip;  in fair_share_manage()
114 		if (trip->temperature == THERMAL_TEMP_INVALID ||  in fair_share_manage()
115 		    trip->type == THERMAL_TRIP_CRITICAL ||  in fair_share_manage()
116 		    trip->type == THERMAL_TRIP_HOT)  in fair_share_manage()