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![Daniel Lezcano](/assets/img/avatar_default.png)
Now that the governor table is in place and the macro allows to browse the table, declare the governor so the entry is added in the governor table in the init section. The [un]register_thermal_governors function does no longer need to use the exported [un]register thermal governor's specific function which in turn call the [un]register_thermal_governor. The governors are fully self-encapsulated. The cyclic dependency is no longer needed, remove it. Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
209 lines
5.9 KiB
C
209 lines
5.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* step_wise.c - A step-by-step Thermal throttling governor
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*
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* Copyright (C) 2012 Intel Corp
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* Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/thermal.h>
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#include <trace/events/thermal.h>
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#include "thermal_core.h"
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/*
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* If the temperature is higher than a trip point,
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* a. if the trend is THERMAL_TREND_RAISING, use higher cooling
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* state for this trip point
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* b. if the trend is THERMAL_TREND_DROPPING, do nothing
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* c. if the trend is THERMAL_TREND_RAISE_FULL, use upper limit
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* for this trip point
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* d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit
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* for this trip point
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* If the temperature is lower than a trip point,
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* a. if the trend is THERMAL_TREND_RAISING, do nothing
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* b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
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* state for this trip point, if the cooling state already
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* equals lower limit, deactivate the thermal instance
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* c. if the trend is THERMAL_TREND_RAISE_FULL, do nothing
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* d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit,
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* if the cooling state already equals lower limit,
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* deactivate the thermal instance
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*/
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static unsigned long get_target_state(struct thermal_instance *instance,
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enum thermal_trend trend, bool throttle)
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{
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struct thermal_cooling_device *cdev = instance->cdev;
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unsigned long cur_state;
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unsigned long next_target;
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/*
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* We keep this instance the way it is by default.
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* Otherwise, we use the current state of the
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* cdev in use to determine the next_target.
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*/
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cdev->ops->get_cur_state(cdev, &cur_state);
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next_target = instance->target;
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dev_dbg(&cdev->device, "cur_state=%ld\n", cur_state);
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if (!instance->initialized) {
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if (throttle) {
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next_target = (cur_state + 1) >= instance->upper ?
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instance->upper :
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((cur_state + 1) < instance->lower ?
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instance->lower : (cur_state + 1));
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} else {
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next_target = THERMAL_NO_TARGET;
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}
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return next_target;
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}
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switch (trend) {
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case THERMAL_TREND_RAISING:
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if (throttle) {
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next_target = cur_state < instance->upper ?
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(cur_state + 1) : instance->upper;
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if (next_target < instance->lower)
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next_target = instance->lower;
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}
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break;
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case THERMAL_TREND_RAISE_FULL:
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if (throttle)
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next_target = instance->upper;
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break;
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case THERMAL_TREND_DROPPING:
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if (cur_state <= instance->lower) {
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if (!throttle)
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next_target = THERMAL_NO_TARGET;
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} else {
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if (!throttle) {
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next_target = cur_state - 1;
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if (next_target > instance->upper)
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next_target = instance->upper;
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}
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}
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break;
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case THERMAL_TREND_DROP_FULL:
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if (cur_state == instance->lower) {
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if (!throttle)
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next_target = THERMAL_NO_TARGET;
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} else
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next_target = instance->lower;
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break;
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default:
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break;
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}
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return next_target;
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}
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static void update_passive_instance(struct thermal_zone_device *tz,
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enum thermal_trip_type type, int value)
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{
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/*
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* If value is +1, activate a passive instance.
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* If value is -1, deactivate a passive instance.
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*/
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if (type == THERMAL_TRIP_PASSIVE || type == THERMAL_TRIPS_NONE)
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tz->passive += value;
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}
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static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
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{
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int trip_temp;
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enum thermal_trip_type trip_type;
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enum thermal_trend trend;
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struct thermal_instance *instance;
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bool throttle = false;
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int old_target;
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if (trip == THERMAL_TRIPS_NONE) {
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trip_temp = tz->forced_passive;
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trip_type = THERMAL_TRIPS_NONE;
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} else {
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tz->ops->get_trip_temp(tz, trip, &trip_temp);
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tz->ops->get_trip_type(tz, trip, &trip_type);
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}
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trend = get_tz_trend(tz, trip);
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if (tz->temperature >= trip_temp) {
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throttle = true;
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trace_thermal_zone_trip(tz, trip, trip_type);
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}
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dev_dbg(&tz->device, "Trip%d[type=%d,temp=%d]:trend=%d,throttle=%d\n",
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trip, trip_type, trip_temp, trend, throttle);
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mutex_lock(&tz->lock);
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list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
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if (instance->trip != trip)
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continue;
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old_target = instance->target;
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instance->target = get_target_state(instance, trend, throttle);
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dev_dbg(&instance->cdev->device, "old_target=%d, target=%d\n",
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old_target, (int)instance->target);
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if (instance->initialized && old_target == instance->target)
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continue;
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/* Activate a passive thermal instance */
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if (old_target == THERMAL_NO_TARGET &&
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instance->target != THERMAL_NO_TARGET)
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update_passive_instance(tz, trip_type, 1);
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/* Deactivate a passive thermal instance */
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else if (old_target != THERMAL_NO_TARGET &&
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instance->target == THERMAL_NO_TARGET)
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update_passive_instance(tz, trip_type, -1);
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instance->initialized = true;
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mutex_lock(&instance->cdev->lock);
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instance->cdev->updated = false; /* cdev needs update */
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mutex_unlock(&instance->cdev->lock);
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}
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mutex_unlock(&tz->lock);
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}
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/**
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* step_wise_throttle - throttles devices associated with the given zone
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* @tz - thermal_zone_device
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* @trip - trip point index
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*
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* Throttling Logic: This uses the trend of the thermal zone to throttle.
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* If the thermal zone is 'heating up' this throttles all the cooling
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* devices associated with the zone and its particular trip point, by one
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* step. If the zone is 'cooling down' it brings back the performance of
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* the devices by one step.
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*/
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static int step_wise_throttle(struct thermal_zone_device *tz, int trip)
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{
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struct thermal_instance *instance;
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thermal_zone_trip_update(tz, trip);
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if (tz->forced_passive)
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thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE);
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mutex_lock(&tz->lock);
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list_for_each_entry(instance, &tz->thermal_instances, tz_node)
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thermal_cdev_update(instance->cdev);
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mutex_unlock(&tz->lock);
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return 0;
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}
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static struct thermal_governor thermal_gov_step_wise = {
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.name = "step_wise",
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.throttle = step_wise_throttle,
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};
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THERMAL_GOVERNOR_DECLARE(thermal_gov_step_wise);
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