diff options
Diffstat (limited to 'drivers/thermal/fair_share.c')
| -rw-r--r-- | drivers/thermal/fair_share.c | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/drivers/thermal/fair_share.c b/drivers/thermal/fair_share.c deleted file mode 100644 index d3469fbc5207..000000000000 --- a/drivers/thermal/fair_share.c +++ /dev/null @@ -1,142 +0,0 @@ -/* - * 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 <trace/events/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; - int trip_temp; - enum thermal_trip_type trip_type; - - 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; - } - - /* - * count > 0 only if temperature is greater than first trip - * point, in which case, trip_point = count - 1 - */ - if (count > 0) { - tz->ops->get_trip_type(tz, count - 1, &trip_type); - trace_thermal_zone_trip(tz, count - 1, trip_type); - } - - return count; -} - -static long get_target_state(struct thermal_zone_device *tz, - struct thermal_cooling_device *cdev, int percentage, int level) -{ - unsigned long max_state; - - cdev->ops->get_max_state(cdev, &max_state); - - return (long)(percentage * level * max_state) / (100 * tz->trips); -} - -/** - * fair_share_throttle - throttles devices associated with the given zone - * @tz - thermal_zone_device - * @trip - trip point index - * - * 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. percentage[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) -{ - struct thermal_instance *instance; - int total_weight = 0; - int total_instance = 0; - int cur_trip_level = get_trip_level(tz); - - list_for_each_entry(instance, &tz->thermal_instances, tz_node) { - if (instance->trip != trip) - continue; - - total_weight += instance->weight; - total_instance++; - } - - list_for_each_entry(instance, &tz->thermal_instances, tz_node) { - int percentage; - struct thermal_cooling_device *cdev = instance->cdev; - - if (instance->trip != trip) - continue; - - if (!total_weight) - percentage = 100 / total_instance; - else - percentage = (instance->weight * 100) / total_weight; - - instance->target = get_target_state(tz, cdev, percentage, - cur_trip_level); - - mutex_lock(&instance->cdev->lock); - instance->cdev->updated = false; - mutex_unlock(&instance->cdev->lock); - 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); -} - |