linux/drivers/thermal/gov_fair_share.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  fair_share.c - A simple weight based Thermal governor
 *
 *  Copyright (C) 2012 Intel Corp
 *  Copyright (C) 2012 Durgadoss R <[email protected]>
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/thermal.h>
#include "thermal_trace.h"

#include "thermal_core.h"

static int get_trip_level(struct thermal_zone_device *tz)
{ … }

/**
 * fair_share_throttle - throttles devices associated with the given zone
 * @tz: thermal_zone_device
 * @trip: trip point
 * @trip_level: number of trips crossed by the zone temperature
 *
 * Throttling Logic: This uses three parameters to calculate the new
 * throttle state of the cooling devices associated with the given zone.
 *
 * Parameters used for Throttling:
 * P1. max_state: Maximum throttle state exposed by the cooling device.
 * P2. weight[i]/total_weight:
 *	How 'effective' the 'i'th device is, in cooling the given zone.
 * P3. trip_level/max_no_of_trips:
 *	This describes the extent to which the devices should be throttled.
 *	We do not want to throttle too much when we trip a lower temperature,
 *	whereas the throttling is at full swing if we trip critical levels.
 * new_state of cooling device = P3 * P2 * P1
 */
static void fair_share_throttle(struct thermal_zone_device *tz,
				const struct thermal_trip *trip,
				int trip_level)
{ … }

static void fair_share_manage(struct thermal_zone_device *tz)
{ … }

static struct thermal_governor thermal_gov_fair_share = …;
THERMAL_GOVERNOR_DECLARE(…) …;