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8c35b1f472
Modify the governor .throttle() callback definition so that it takes a trip pointer instead of a trip index as its second argument, adjust the governors accordingly and update the core code invoking .throttle(). This causes the governors to become independent of the representation of the list of trips in the thermal zone structure. This change is not expected to alter the general functionality. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
152 lines
4.5 KiB
C
152 lines
4.5 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 <linux/minmax.h>
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#include "thermal_trace.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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* 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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*/
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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 = clamp((cur_state + 1), instance->lower, instance->upper);
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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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if (throttle) {
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if (trend == THERMAL_TREND_RAISING)
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next_target = clamp((cur_state + 1), instance->lower, instance->upper);
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} else {
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if (trend == THERMAL_TREND_DROPPING) {
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if (cur_state <= instance->lower)
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next_target = THERMAL_NO_TARGET;
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else
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next_target = clamp((cur_state - 1), instance->lower, instance->upper);
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}
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}
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return next_target;
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}
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static void thermal_zone_trip_update(struct thermal_zone_device *tz,
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const struct thermal_trip *trip)
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{
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int trip_id = thermal_zone_trip_id(tz, trip);
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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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trend = get_tz_trend(tz, trip);
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if (tz->temperature >= trip->temperature) {
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throttle = true;
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trace_thermal_zone_trip(tz, trip_id, 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_id, trip->type, trip->temperature, trend, throttle);
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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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if (old_target == THERMAL_NO_TARGET &&
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instance->target != THERMAL_NO_TARGET) {
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/* Activate a passive thermal instance */
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if (trip->type == THERMAL_TRIP_PASSIVE)
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tz->passive++;
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} else if (old_target != THERMAL_NO_TARGET &&
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instance->target == THERMAL_NO_TARGET) {
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/* Deactivate a passive thermal instance */
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if (trip->type == THERMAL_TRIP_PASSIVE)
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tz->passive--;
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}
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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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}
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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
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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,
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const struct thermal_trip *trip)
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{
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struct thermal_instance *instance;
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lockdep_assert_held(&tz->lock);
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thermal_zone_trip_update(tz, trip);
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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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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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