mirror of https://gitee.com/openkylin/linux.git
123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/*
|
|
* fair_share.c - A simple weight based Thermal governor
|
|
*
|
|
* Copyright (C) 2012 Intel Corp
|
|
* Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*/
|
|
|
|
#include <linux/thermal.h>
|
|
|
|
#include "thermal_core.h"
|
|
|
|
/**
|
|
* get_trip_level: - obtains the current trip level for a zone
|
|
* @tz: thermal zone device
|
|
*/
|
|
static int get_trip_level(struct thermal_zone_device *tz)
|
|
{
|
|
int count = 0;
|
|
unsigned long trip_temp;
|
|
|
|
if (tz->trips == 0 || !tz->ops->get_trip_temp)
|
|
return 0;
|
|
|
|
for (count = 0; count < tz->trips; count++) {
|
|
tz->ops->get_trip_temp(tz, count, &trip_temp);
|
|
if (tz->temperature < trip_temp)
|
|
break;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static long get_target_state(struct thermal_zone_device *tz,
|
|
struct thermal_cooling_device *cdev, int weight, int level)
|
|
{
|
|
unsigned long max_state;
|
|
|
|
cdev->ops->get_max_state(cdev, &max_state);
|
|
|
|
return (long)(weight * level * max_state) / (100 * tz->trips);
|
|
}
|
|
|
|
/**
|
|
* fair_share_throttle - throttles devices asscciated with the given zone
|
|
* @tz - thermal_zone_device
|
|
*
|
|
* 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]/100:
|
|
* How 'effective' the 'i'th device is, in cooling the given zone.
|
|
* P3. cur_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.
|
|
* (Heavily assumes the trip points are in ascending order)
|
|
* new_state of cooling device = P3 * P2 * P1
|
|
*/
|
|
static int fair_share_throttle(struct thermal_zone_device *tz, int trip)
|
|
{
|
|
const struct thermal_zone_params *tzp;
|
|
struct thermal_cooling_device *cdev;
|
|
struct thermal_instance *instance;
|
|
int i;
|
|
int cur_trip_level = get_trip_level(tz);
|
|
|
|
if (!tz->tzp || !tz->tzp->tbp)
|
|
return -EINVAL;
|
|
|
|
tzp = tz->tzp;
|
|
|
|
for (i = 0; i < tzp->num_tbps; i++) {
|
|
if (!tzp->tbp[i].cdev)
|
|
continue;
|
|
|
|
cdev = tzp->tbp[i].cdev;
|
|
instance = get_thermal_instance(tz, cdev, trip);
|
|
if (!instance)
|
|
continue;
|
|
|
|
instance->target = get_target_state(tz, cdev,
|
|
tzp->tbp[i].weight, cur_trip_level);
|
|
|
|
instance->cdev->updated = false;
|
|
thermal_cdev_update(cdev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct thermal_governor thermal_gov_fair_share = {
|
|
.name = "fair_share",
|
|
.throttle = fair_share_throttle,
|
|
};
|
|
|
|
int thermal_gov_fair_share_register(void)
|
|
{
|
|
return thermal_register_governor(&thermal_gov_fair_share);
|
|
}
|
|
|
|
void thermal_gov_fair_share_unregister(void)
|
|
{
|
|
thermal_unregister_governor(&thermal_gov_fair_share);
|
|
}
|
|
|