/* * fair_share.c - A simple weight based Thermal governor * * Copyright (C) 2012 Intel Corp * Copyright (C) 2012 Durgadoss R * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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 #include #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 * * 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); } space:mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2017-02-09 13:22:54 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-09 13:22:54 -0800
commit55aac6ef53e114c28170ee3f79065cfa8ca9cf3f (patch)
tree7eac44b0f280f8faea96c9ff09d2f650f04e3d46 /drivers/usb/serial
parent2b369478e1856e3809f439495567474725931585 (diff)
parentb22bc27868e8c11fe3f00937a341b44f80b50364 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
Pull SCSI target fixes from Nicholas Bellinger: "This target series for v4.10 contains fixes which address a few long-standing bugs that DATERA's QA + automation teams have uncovered while putting v4.1.y target code into production usage. We've been running the top three in our nightly automated regression runs for the last two months, and the COMPARE_AND_WRITE fix Mr. Gary Guo has been manually verifying against a four node ESX cluster this past week. Note all of them have CC' stable tags. Summary: - Fix a bug with ESX EXTENDED_COPY + SAM_STAT_RESERVATION_CONFLICT status, where target_core_xcopy.c logic was incorrectly returning SAM_STAT_CHECK_CONDITION for all non SAM_STAT_GOOD cases (Nixon Vincent) - Fix a TMR LUN_RESET hung task bug while other in-flight TMRs are being aborted, before the new one had been dispatched into tmr_wq (Rob Millner) - Fix a long standing double free OOPs, where a dynamically generated 'demo-mode' NodeACL has multiple sessions associated with it, and the /sys/kernel/config/target/$FABRIC/$WWN/ subsequently disables demo-mode, but never converts the dynamic ACL into a explicit ACL (Rob Millner) - Fix a long standing reference leak with ESX VAAI COMPARE_AND_WRITE when the second phase WRITE COMMIT command fails, resulting in CHECK_CONDITION response never being sent and se_cmd->cmd_kref never reaching zero (Gary Guo) Beyond these items on v4.1.y we've reproduced, fixed, and run through our regression test suite using iscsi-target exports, there are two additional outstanding list items: - Remove a >= v4.2 RCU conversion BUG_ON that would trigger when dynamic node NodeACLs where being converted to explicit NodeACLs. The patch drops the BUG_ON to follow how pre RCU conversion worked for this special case (Benjamin Estrabaud) - Add ibmvscsis target_core_fabric_ops->max_data_sg_nent assignment to match what IBM's Virtual SCSI hypervisor is already enforcing at transport layer. (Bryant Ly + Steven Royer)" * git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: ibmvscsis: Add SGL limit target: Fix COMPARE_AND_WRITE ref leak for non GOOD status target: Fix multi-session dynamic se_node_acl double free OOPs target: Fix early transport_generic_handle_tmr abort scenario target: Use correct SCSI status during EXTENDED_COPY exception target: Don't BUG_ON during NodeACL dynamic -> explicit conversion
Diffstat (limited to 'drivers/usb/serial')