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daeeb032f4
The threshold field in struct thermal_trip is only used internally by the thermal core and it is better to prevent drivers from misusing it. It also takes some space unnecessarily in the trip tables passed by drivers to the core during thermal zone registration. For this reason, introduce struct thermal_trip_desc as a wrapper around struct thermal_trip, move the threshold field directly into it and make the thermal core store struct thermal_trip_desc objects in the internal thermal zone trip tables. Adjust all of the code using trip tables in the thermal core accordingly. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* fair_share.c - A simple weight based Thermal 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 "thermal_trace.h"
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#include "thermal_core.h"
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static int get_trip_level(struct thermal_zone_device *tz)
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{
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const struct thermal_trip *level_trip = NULL;
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const struct thermal_trip_desc *td;
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int trip_level = -1;
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for_each_trip_desc(tz, td) {
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const struct thermal_trip *trip = &td->trip;
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if (trip->temperature >= tz->temperature)
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continue;
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trip_level++;
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if (!level_trip || trip->temperature > level_trip->temperature)
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level_trip = trip;
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}
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/* Bail out if the temperature is not greater than any trips. */
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if (trip_level < 0)
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return 0;
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trace_thermal_zone_trip(tz, thermal_zone_trip_id(tz, level_trip),
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level_trip->type);
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return trip_level;
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}
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static long get_target_state(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev, int percentage, int level)
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{
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return (long)(percentage * level * cdev->max_state) / (100 * tz->num_trips);
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}
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/**
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* fair_share_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 three parameters to calculate the new
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* throttle state of the cooling devices associated with the given zone.
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*
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* Parameters used for Throttling:
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* P1. max_state: Maximum throttle state exposed by the cooling device.
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* P2. percentage[i]/100:
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* How 'effective' the 'i'th device is, in cooling the given zone.
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* P3. cur_trip_level/max_no_of_trips:
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* This describes the extent to which the devices should be throttled.
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* We do not want to throttle too much when we trip a lower temperature,
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* whereas the throttling is at full swing if we trip critical levels.
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* (Heavily assumes the trip points are in ascending order)
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* new_state of cooling device = P3 * P2 * P1
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*/
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static int fair_share_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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int total_weight = 0;
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int total_instance = 0;
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int cur_trip_level = get_trip_level(tz);
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lockdep_assert_held(&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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total_weight += instance->weight;
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total_instance++;
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}
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list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
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int percentage;
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struct thermal_cooling_device *cdev = instance->cdev;
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if (instance->trip != trip)
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continue;
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if (!total_weight)
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percentage = 100 / total_instance;
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else
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percentage = (instance->weight * 100) / total_weight;
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instance->target = get_target_state(tz, cdev, percentage,
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cur_trip_level);
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mutex_lock(&cdev->lock);
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__thermal_cdev_update(cdev);
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mutex_unlock(&cdev->lock);
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}
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return 0;
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}
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static struct thermal_governor thermal_gov_fair_share = {
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.name = "fair_share",
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.throttle = fair_share_throttle,
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};
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THERMAL_GOVERNOR_DECLARE(thermal_gov_fair_share);
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