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a930da9bf5
All the different calls inside the thermal_zone_device_update() function take the mutex. The previous changes move the mutex out of the different functions, like the throttling ops. Now that the mutexes are all at the same level in the call stack for the thermal_zone_device_update() function, they can be moved inside this one. That has the benefit of: 1. Simplify the code by not having a plethora of places where the lock is taken 2. Probably closes more race windows because releasing the lock from one line to another can give the opportunity to the thermal zone to change its state in the meantime. For example, the thermal zone can be enabled right after checking it is disabled. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20220805153834.2510142-5-daniel.lezcano@linaro.org
163 lines
5.3 KiB
C
163 lines
5.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* thermal_core.h
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*
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* Copyright (C) 2012 Intel Corp
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* Author: Durgadoss R <durgadoss.r@intel.com>
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*/
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#ifndef __THERMAL_CORE_H__
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#define __THERMAL_CORE_H__
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#include <linux/device.h>
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#include <linux/thermal.h>
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#include "thermal_netlink.h"
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/* Default Thermal Governor */
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#if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
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#define DEFAULT_THERMAL_GOVERNOR "step_wise"
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#elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
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#define DEFAULT_THERMAL_GOVERNOR "fair_share"
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#elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
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#define DEFAULT_THERMAL_GOVERNOR "user_space"
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#elif defined(CONFIG_THERMAL_DEFAULT_GOV_POWER_ALLOCATOR)
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#define DEFAULT_THERMAL_GOVERNOR "power_allocator"
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#endif
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/* Initial state of a cooling device during binding */
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#define THERMAL_NO_TARGET -1UL
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/* Init section thermal table */
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extern struct thermal_governor *__governor_thermal_table[];
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extern struct thermal_governor *__governor_thermal_table_end[];
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#define THERMAL_TABLE_ENTRY(table, name) \
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static typeof(name) *__thermal_table_entry_##name \
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__used __section("__" #table "_thermal_table") = &name
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#define THERMAL_GOVERNOR_DECLARE(name) THERMAL_TABLE_ENTRY(governor, name)
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#define for_each_governor_table(__governor) \
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for (__governor = __governor_thermal_table; \
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__governor < __governor_thermal_table_end; \
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__governor++)
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int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
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void *);
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int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
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void *), void *);
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int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
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void *thermal_governor);
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struct thermal_zone_device *thermal_zone_get_by_id(int id);
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struct thermal_attr {
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struct device_attribute attr;
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char name[THERMAL_NAME_LENGTH];
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};
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static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
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{
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return cdev->ops->get_requested_power && cdev->ops->state2power &&
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cdev->ops->power2state;
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}
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void thermal_cdev_update(struct thermal_cooling_device *);
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void __thermal_cdev_update(struct thermal_cooling_device *cdev);
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int get_tz_trend(struct thermal_zone_device *tz, int trip);
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struct thermal_instance *
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get_thermal_instance(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev,
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int trip);
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/*
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* This structure is used to describe the behavior of
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* a certain cooling device on a certain trip point
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* in a certain thermal zone
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*/
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struct thermal_instance {
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int id;
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char name[THERMAL_NAME_LENGTH];
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struct thermal_zone_device *tz;
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struct thermal_cooling_device *cdev;
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int trip;
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bool initialized;
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unsigned long upper; /* Highest cooling state for this trip point */
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unsigned long lower; /* Lowest cooling state for this trip point */
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unsigned long target; /* expected cooling state */
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char attr_name[THERMAL_NAME_LENGTH];
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struct device_attribute attr;
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char weight_attr_name[THERMAL_NAME_LENGTH];
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struct device_attribute weight_attr;
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struct list_head tz_node; /* node in tz->thermal_instances */
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struct list_head cdev_node; /* node in cdev->thermal_instances */
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unsigned int weight; /* The weight of the cooling device */
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};
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#define to_thermal_zone(_dev) \
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container_of(_dev, struct thermal_zone_device, device)
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#define to_cooling_device(_dev) \
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container_of(_dev, struct thermal_cooling_device, device)
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int thermal_register_governor(struct thermal_governor *);
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void thermal_unregister_governor(struct thermal_governor *);
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int thermal_zone_device_set_policy(struct thermal_zone_device *, char *);
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int thermal_build_list_of_policies(char *buf);
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/* Helpers */
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void thermal_zone_set_trips(struct thermal_zone_device *tz);
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void __thermal_zone_set_trips(struct thermal_zone_device *tz);
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int __thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
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/* sysfs I/F */
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int thermal_zone_create_device_groups(struct thermal_zone_device *, int);
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void thermal_zone_destroy_device_groups(struct thermal_zone_device *);
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void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *);
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void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev);
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/* used only at binding time */
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ssize_t trip_point_show(struct device *, struct device_attribute *, char *);
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ssize_t weight_show(struct device *, struct device_attribute *, char *);
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ssize_t weight_store(struct device *, struct device_attribute *, const char *,
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size_t);
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#ifdef CONFIG_THERMAL_STATISTICS
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void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
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unsigned long new_state);
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#else
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static inline void
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thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
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unsigned long new_state) {}
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#endif /* CONFIG_THERMAL_STATISTICS */
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/* device tree support */
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#ifdef CONFIG_THERMAL_OF
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int of_thermal_get_ntrips(struct thermal_zone_device *);
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bool of_thermal_is_trip_valid(struct thermal_zone_device *, int);
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const struct thermal_trip *
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of_thermal_get_trip_points(struct thermal_zone_device *);
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#else
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static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
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{
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return 0;
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}
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static inline bool of_thermal_is_trip_valid(struct thermal_zone_device *tz,
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int trip)
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{
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return false;
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}
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static inline const struct thermal_trip *
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of_thermal_get_trip_points(struct thermal_zone_device *tz)
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{
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return NULL;
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}
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#endif
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int thermal_zone_device_is_enabled(struct thermal_zone_device *tz);
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#endif /* __THERMAL_CORE_H__ */
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