forked from Minki/linux
163b00cde7
1851799e1d
("thermal: Fix use-after-free when unregistering thermal zone device") changed cancel_delayed_work to cancel_delayed_work_sync to avoid a use-after-free issue. However, cancel_delayed_work_sync could be called insides the WQ causing deadlock. [54109.642398] c0 1162 kworker/u17:1 D 0 11030 2 0x00000000 [54109.642437] c0 1162 Workqueue: thermal_passive_wq thermal_zone_device_check [54109.642447] c0 1162 Call trace: [54109.642456] c0 1162 __switch_to+0x138/0x158 [54109.642467] c0 1162 __schedule+0xba4/0x1434 [54109.642480] c0 1162 schedule_timeout+0xa0/0xb28 [54109.642492] c0 1162 wait_for_common+0x138/0x2e8 [54109.642511] c0 1162 flush_work+0x348/0x40c [54109.642522] c0 1162 __cancel_work_timer+0x180/0x218 [54109.642544] c0 1162 handle_thermal_trip+0x2c4/0x5a4 [54109.642553] c0 1162 thermal_zone_device_update+0x1b4/0x25c [54109.642563] c0 1162 thermal_zone_device_check+0x18/0x24 [54109.642574] c0 1162 process_one_work+0x3cc/0x69c [54109.642583] c0 1162 worker_thread+0x49c/0x7c0 [54109.642593] c0 1162 kthread+0x17c/0x1b0 [54109.642602] c0 1162 ret_from_fork+0x10/0x18 [54109.643051] c0 1162 kworker/u17:2 D 0 16245 2 0x00000000 [54109.643067] c0 1162 Workqueue: thermal_passive_wq thermal_zone_device_check [54109.643077] c0 1162 Call trace: [54109.643085] c0 1162 __switch_to+0x138/0x158 [54109.643095] c0 1162 __schedule+0xba4/0x1434 [54109.643104] c0 1162 schedule_timeout+0xa0/0xb28 [54109.643114] c0 1162 wait_for_common+0x138/0x2e8 [54109.643122] c0 1162 flush_work+0x348/0x40c [54109.643131] c0 1162 __cancel_work_timer+0x180/0x218 [54109.643141] c0 1162 handle_thermal_trip+0x2c4/0x5a4 [54109.643150] c0 1162 thermal_zone_device_update+0x1b4/0x25c [54109.643159] c0 1162 thermal_zone_device_check+0x18/0x24 [54109.643167] c0 1162 process_one_work+0x3cc/0x69c [54109.643177] c0 1162 worker_thread+0x49c/0x7c0 [54109.643186] c0 1162 kthread+0x17c/0x1b0 [54109.643195] c0 1162 ret_from_fork+0x10/0x18 [54109.644500] c0 1162 cat D 0 7766 1 0x00000001 [54109.644515] c0 1162 Call trace: [54109.644524] c0 1162 __switch_to+0x138/0x158 [54109.644536] c0 1162 __schedule+0xba4/0x1434 [54109.644546] c0 1162 schedule_preempt_disabled+0x80/0xb0 [54109.644555] c0 1162 __mutex_lock+0x3a8/0x7f0 [54109.644563] c0 1162 __mutex_lock_slowpath+0x14/0x20 [54109.644575] c0 1162 thermal_zone_get_temp+0x84/0x360 [54109.644586] c0 1162 temp_show+0x30/0x78 [54109.644609] c0 1162 dev_attr_show+0x5c/0xf0 [54109.644628] c0 1162 sysfs_kf_seq_show+0xcc/0x1a4 [54109.644636] c0 1162 kernfs_seq_show+0x48/0x88 [54109.644656] c0 1162 seq_read+0x1f4/0x73c [54109.644664] c0 1162 kernfs_fop_read+0x84/0x318 [54109.644683] c0 1162 __vfs_read+0x50/0x1bc [54109.644692] c0 1162 vfs_read+0xa4/0x140 [54109.644701] c0 1162 SyS_read+0xbc/0x144 [54109.644708] c0 1162 el0_svc_naked+0x34/0x38 [54109.845800] c0 1162 D 720.000s 1->7766->7766 cat [panic] Fixes:1851799e1d
("thermal: Fix use-after-free when unregistering thermal zone device") Cc: stable@vger.kernel.org Signed-off-by: Wei Wang <wvw@google.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
1541 lines
41 KiB
C
1541 lines
41 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* thermal.c - Generic Thermal Management Sysfs support.
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*
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* Copyright (C) 2008 Intel Corp
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* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
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* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/kdev_t.h>
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#include <linux/idr.h>
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#include <linux/thermal.h>
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#include <linux/reboot.h>
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#include <linux/string.h>
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#include <linux/of.h>
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#include <linux/suspend.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/thermal.h>
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#include "thermal_core.h"
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#include "thermal_hwmon.h"
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MODULE_AUTHOR("Zhang Rui");
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MODULE_DESCRIPTION("Generic thermal management sysfs support");
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MODULE_LICENSE("GPL v2");
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static DEFINE_IDA(thermal_tz_ida);
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static DEFINE_IDA(thermal_cdev_ida);
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static LIST_HEAD(thermal_tz_list);
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static LIST_HEAD(thermal_cdev_list);
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static LIST_HEAD(thermal_governor_list);
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static DEFINE_MUTEX(thermal_list_lock);
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static DEFINE_MUTEX(thermal_governor_lock);
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static DEFINE_MUTEX(poweroff_lock);
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static atomic_t in_suspend;
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static bool power_off_triggered;
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static struct thermal_governor *def_governor;
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/*
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* Governor section: set of functions to handle thermal governors
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*
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* Functions to help in the life cycle of thermal governors within
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* the thermal core and by the thermal governor code.
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*/
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static struct thermal_governor *__find_governor(const char *name)
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{
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struct thermal_governor *pos;
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if (!name || !name[0])
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return def_governor;
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list_for_each_entry(pos, &thermal_governor_list, governor_list)
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if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
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return pos;
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return NULL;
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}
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/**
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* bind_previous_governor() - bind the previous governor of the thermal zone
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* @tz: a valid pointer to a struct thermal_zone_device
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* @failed_gov_name: the name of the governor that failed to register
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*
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* Register the previous governor of the thermal zone after a new
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* governor has failed to be bound.
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*/
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static void bind_previous_governor(struct thermal_zone_device *tz,
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const char *failed_gov_name)
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{
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if (tz->governor && tz->governor->bind_to_tz) {
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if (tz->governor->bind_to_tz(tz)) {
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dev_err(&tz->device,
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"governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
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failed_gov_name, tz->governor->name, tz->type);
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tz->governor = NULL;
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}
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}
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}
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/**
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* thermal_set_governor() - Switch to another governor
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* @tz: a valid pointer to a struct thermal_zone_device
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* @new_gov: pointer to the new governor
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*
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* Change the governor of thermal zone @tz.
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*
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* Return: 0 on success, an error if the new governor's bind_to_tz() failed.
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*/
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static int thermal_set_governor(struct thermal_zone_device *tz,
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struct thermal_governor *new_gov)
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{
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int ret = 0;
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if (tz->governor && tz->governor->unbind_from_tz)
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tz->governor->unbind_from_tz(tz);
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if (new_gov && new_gov->bind_to_tz) {
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ret = new_gov->bind_to_tz(tz);
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if (ret) {
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bind_previous_governor(tz, new_gov->name);
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return ret;
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}
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}
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tz->governor = new_gov;
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return ret;
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}
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int thermal_register_governor(struct thermal_governor *governor)
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{
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int err;
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const char *name;
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struct thermal_zone_device *pos;
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if (!governor)
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return -EINVAL;
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mutex_lock(&thermal_governor_lock);
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err = -EBUSY;
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if (!__find_governor(governor->name)) {
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bool match_default;
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err = 0;
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list_add(&governor->governor_list, &thermal_governor_list);
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match_default = !strncmp(governor->name,
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DEFAULT_THERMAL_GOVERNOR,
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THERMAL_NAME_LENGTH);
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if (!def_governor && match_default)
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def_governor = governor;
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}
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mutex_lock(&thermal_list_lock);
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list_for_each_entry(pos, &thermal_tz_list, node) {
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/*
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* only thermal zones with specified tz->tzp->governor_name
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* may run with tz->govenor unset
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*/
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if (pos->governor)
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continue;
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name = pos->tzp->governor_name;
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if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
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int ret;
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ret = thermal_set_governor(pos, governor);
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if (ret)
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dev_err(&pos->device,
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"Failed to set governor %s for thermal zone %s: %d\n",
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governor->name, pos->type, ret);
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}
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}
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mutex_unlock(&thermal_list_lock);
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mutex_unlock(&thermal_governor_lock);
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return err;
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}
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void thermal_unregister_governor(struct thermal_governor *governor)
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{
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struct thermal_zone_device *pos;
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if (!governor)
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return;
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mutex_lock(&thermal_governor_lock);
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if (!__find_governor(governor->name))
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goto exit;
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mutex_lock(&thermal_list_lock);
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list_for_each_entry(pos, &thermal_tz_list, node) {
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if (!strncasecmp(pos->governor->name, governor->name,
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THERMAL_NAME_LENGTH))
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thermal_set_governor(pos, NULL);
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}
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mutex_unlock(&thermal_list_lock);
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list_del(&governor->governor_list);
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exit:
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mutex_unlock(&thermal_governor_lock);
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}
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int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
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char *policy)
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{
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struct thermal_governor *gov;
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int ret = -EINVAL;
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mutex_lock(&thermal_governor_lock);
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mutex_lock(&tz->lock);
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gov = __find_governor(strim(policy));
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if (!gov)
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goto exit;
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ret = thermal_set_governor(tz, gov);
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exit:
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mutex_unlock(&tz->lock);
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mutex_unlock(&thermal_governor_lock);
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return ret;
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}
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int thermal_build_list_of_policies(char *buf)
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{
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struct thermal_governor *pos;
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ssize_t count = 0;
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ssize_t size = PAGE_SIZE;
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mutex_lock(&thermal_governor_lock);
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list_for_each_entry(pos, &thermal_governor_list, governor_list) {
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size = PAGE_SIZE - count;
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count += scnprintf(buf + count, size, "%s ", pos->name);
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}
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count += scnprintf(buf + count, size, "\n");
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mutex_unlock(&thermal_governor_lock);
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return count;
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}
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static void __init thermal_unregister_governors(void)
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{
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struct thermal_governor **governor;
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for_each_governor_table(governor)
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thermal_unregister_governor(*governor);
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}
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static int __init thermal_register_governors(void)
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{
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int ret = 0;
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struct thermal_governor **governor;
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for_each_governor_table(governor) {
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ret = thermal_register_governor(*governor);
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if (ret) {
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pr_err("Failed to register governor: '%s'",
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(*governor)->name);
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break;
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}
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pr_info("Registered thermal governor '%s'",
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(*governor)->name);
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}
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if (ret) {
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struct thermal_governor **gov;
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for_each_governor_table(gov) {
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if (gov == governor)
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break;
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thermal_unregister_governor(*gov);
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}
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}
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return ret;
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}
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/*
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* Zone update section: main control loop applied to each zone while monitoring
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*
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* in polling mode. The monitoring is done using a workqueue.
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* Same update may be done on a zone by calling thermal_zone_device_update().
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*
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* An update means:
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* - Non-critical trips will invoke the governor responsible for that zone;
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* - Hot trips will produce a notification to userspace;
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* - Critical trip point will cause a system shutdown.
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*/
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static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
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int delay)
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{
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if (delay > 1000)
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mod_delayed_work(system_freezable_power_efficient_wq,
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&tz->poll_queue,
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round_jiffies(msecs_to_jiffies(delay)));
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else if (delay)
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mod_delayed_work(system_freezable_power_efficient_wq,
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&tz->poll_queue,
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msecs_to_jiffies(delay));
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else
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cancel_delayed_work(&tz->poll_queue);
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}
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static void monitor_thermal_zone(struct thermal_zone_device *tz)
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{
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mutex_lock(&tz->lock);
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if (tz->passive)
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thermal_zone_device_set_polling(tz, tz->passive_delay);
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else if (tz->polling_delay)
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thermal_zone_device_set_polling(tz, tz->polling_delay);
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else
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thermal_zone_device_set_polling(tz, 0);
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mutex_unlock(&tz->lock);
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}
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static void handle_non_critical_trips(struct thermal_zone_device *tz, int trip)
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{
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tz->governor ? tz->governor->throttle(tz, trip) :
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def_governor->throttle(tz, trip);
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}
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/**
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* thermal_emergency_poweroff_func - emergency poweroff work after a known delay
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* @work: work_struct associated with the emergency poweroff function
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*
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* This function is called in very critical situations to force
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* a kernel poweroff after a configurable timeout value.
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*/
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static void thermal_emergency_poweroff_func(struct work_struct *work)
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{
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/*
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* We have reached here after the emergency thermal shutdown
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* Waiting period has expired. This means orderly_poweroff has
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* not been able to shut off the system for some reason.
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* Try to shut down the system immediately using kernel_power_off
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* if populated
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*/
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WARN(1, "Attempting kernel_power_off: Temperature too high\n");
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kernel_power_off();
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/*
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* Worst of the worst case trigger emergency restart
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*/
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WARN(1, "Attempting emergency_restart: Temperature too high\n");
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emergency_restart();
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}
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static DECLARE_DELAYED_WORK(thermal_emergency_poweroff_work,
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thermal_emergency_poweroff_func);
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/**
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* thermal_emergency_poweroff - Trigger an emergency system poweroff
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*
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* This may be called from any critical situation to trigger a system shutdown
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* after a known period of time. By default this is not scheduled.
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*/
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static void thermal_emergency_poweroff(void)
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{
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int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS;
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/*
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* poweroff_delay_ms must be a carefully profiled positive value.
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* Its a must for thermal_emergency_poweroff_work to be scheduled
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*/
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if (poweroff_delay_ms <= 0)
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return;
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schedule_delayed_work(&thermal_emergency_poweroff_work,
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msecs_to_jiffies(poweroff_delay_ms));
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}
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static void handle_critical_trips(struct thermal_zone_device *tz,
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int trip, enum thermal_trip_type trip_type)
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{
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int trip_temp;
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tz->ops->get_trip_temp(tz, trip, &trip_temp);
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/* If we have not crossed the trip_temp, we do not care. */
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if (trip_temp <= 0 || tz->temperature < trip_temp)
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return;
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trace_thermal_zone_trip(tz, trip, trip_type);
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if (tz->ops->notify)
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tz->ops->notify(tz, trip, trip_type);
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if (trip_type == THERMAL_TRIP_CRITICAL) {
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dev_emerg(&tz->device,
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"critical temperature reached (%d C), shutting down\n",
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tz->temperature / 1000);
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mutex_lock(&poweroff_lock);
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if (!power_off_triggered) {
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/*
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* Queue a backup emergency shutdown in the event of
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* orderly_poweroff failure
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*/
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thermal_emergency_poweroff();
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orderly_poweroff(true);
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power_off_triggered = true;
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}
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mutex_unlock(&poweroff_lock);
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}
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}
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static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
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{
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enum thermal_trip_type type;
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/* Ignore disabled trip points */
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if (test_bit(trip, &tz->trips_disabled))
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return;
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tz->ops->get_trip_type(tz, trip, &type);
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if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
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handle_critical_trips(tz, trip, type);
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else
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handle_non_critical_trips(tz, trip);
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/*
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* Alright, we handled this trip successfully.
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* So, start monitoring again.
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*/
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monitor_thermal_zone(tz);
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}
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static void update_temperature(struct thermal_zone_device *tz)
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{
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int temp, ret;
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ret = thermal_zone_get_temp(tz, &temp);
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if (ret) {
|
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if (ret != -EAGAIN)
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dev_warn(&tz->device,
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"failed to read out thermal zone (%d)\n",
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ret);
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return;
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}
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mutex_lock(&tz->lock);
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tz->last_temperature = tz->temperature;
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tz->temperature = temp;
|
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mutex_unlock(&tz->lock);
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|
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trace_thermal_temperature(tz);
|
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if (tz->last_temperature == THERMAL_TEMP_INVALID)
|
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dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
|
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tz->temperature);
|
|
else
|
|
dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
|
|
tz->last_temperature, tz->temperature);
|
|
}
|
|
|
|
static void thermal_zone_device_init(struct thermal_zone_device *tz)
|
|
{
|
|
struct thermal_instance *pos;
|
|
tz->temperature = THERMAL_TEMP_INVALID;
|
|
list_for_each_entry(pos, &tz->thermal_instances, tz_node)
|
|
pos->initialized = false;
|
|
}
|
|
|
|
static void thermal_zone_device_reset(struct thermal_zone_device *tz)
|
|
{
|
|
tz->passive = 0;
|
|
thermal_zone_device_init(tz);
|
|
}
|
|
|
|
void thermal_zone_device_update(struct thermal_zone_device *tz,
|
|
enum thermal_notify_event event)
|
|
{
|
|
int count;
|
|
|
|
if (atomic_read(&in_suspend))
|
|
return;
|
|
|
|
if (!tz->ops->get_temp)
|
|
return;
|
|
|
|
update_temperature(tz);
|
|
|
|
thermal_zone_set_trips(tz);
|
|
|
|
tz->notify_event = event;
|
|
|
|
for (count = 0; count < tz->trips; count++)
|
|
handle_thermal_trip(tz, count);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_zone_device_update);
|
|
|
|
/**
|
|
* thermal_notify_framework - Sensor drivers use this API to notify framework
|
|
* @tz: thermal zone device
|
|
* @trip: indicates which trip point has been crossed
|
|
*
|
|
* This function handles the trip events from sensor drivers. It starts
|
|
* throttling the cooling devices according to the policy configured.
|
|
* For CRITICAL and HOT trip points, this notifies the respective drivers,
|
|
* and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
|
|
* The throttling policy is based on the configured platform data; if no
|
|
* platform data is provided, this uses the step_wise throttling policy.
|
|
*/
|
|
void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
|
|
{
|
|
handle_thermal_trip(tz, trip);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_notify_framework);
|
|
|
|
static void thermal_zone_device_check(struct work_struct *work)
|
|
{
|
|
struct thermal_zone_device *tz = container_of(work, struct
|
|
thermal_zone_device,
|
|
poll_queue.work);
|
|
thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
|
|
}
|
|
|
|
/*
|
|
* Power actor section: interface to power actors to estimate power
|
|
*
|
|
* Set of functions used to interact to cooling devices that know
|
|
* how to estimate their devices power consumption.
|
|
*/
|
|
|
|
/**
|
|
* power_actor_get_max_power() - get the maximum power that a cdev can consume
|
|
* @cdev: pointer to &thermal_cooling_device
|
|
* @tz: a valid thermal zone device pointer
|
|
* @max_power: pointer in which to store the maximum power
|
|
*
|
|
* Calculate the maximum power consumption in milliwats that the
|
|
* cooling device can currently consume and store it in @max_power.
|
|
*
|
|
* Return: 0 on success, -EINVAL if @cdev doesn't support the
|
|
* power_actor API or -E* on other error.
|
|
*/
|
|
int power_actor_get_max_power(struct thermal_cooling_device *cdev,
|
|
struct thermal_zone_device *tz, u32 *max_power)
|
|
{
|
|
if (!cdev_is_power_actor(cdev))
|
|
return -EINVAL;
|
|
|
|
return cdev->ops->state2power(cdev, tz, 0, max_power);
|
|
}
|
|
|
|
/**
|
|
* power_actor_get_min_power() - get the mainimum power that a cdev can consume
|
|
* @cdev: pointer to &thermal_cooling_device
|
|
* @tz: a valid thermal zone device pointer
|
|
* @min_power: pointer in which to store the minimum power
|
|
*
|
|
* Calculate the minimum power consumption in milliwatts that the
|
|
* cooling device can currently consume and store it in @min_power.
|
|
*
|
|
* Return: 0 on success, -EINVAL if @cdev doesn't support the
|
|
* power_actor API or -E* on other error.
|
|
*/
|
|
int power_actor_get_min_power(struct thermal_cooling_device *cdev,
|
|
struct thermal_zone_device *tz, u32 *min_power)
|
|
{
|
|
unsigned long max_state;
|
|
int ret;
|
|
|
|
if (!cdev_is_power_actor(cdev))
|
|
return -EINVAL;
|
|
|
|
ret = cdev->ops->get_max_state(cdev, &max_state);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return cdev->ops->state2power(cdev, tz, max_state, min_power);
|
|
}
|
|
|
|
/**
|
|
* power_actor_set_power() - limit the maximum power a cooling device consumes
|
|
* @cdev: pointer to &thermal_cooling_device
|
|
* @instance: thermal instance to update
|
|
* @power: the power in milliwatts
|
|
*
|
|
* Set the cooling device to consume at most @power milliwatts. The limit is
|
|
* expected to be a cap at the maximum power consumption.
|
|
*
|
|
* Return: 0 on success, -EINVAL if the cooling device does not
|
|
* implement the power actor API or -E* for other failures.
|
|
*/
|
|
int power_actor_set_power(struct thermal_cooling_device *cdev,
|
|
struct thermal_instance *instance, u32 power)
|
|
{
|
|
unsigned long state;
|
|
int ret;
|
|
|
|
if (!cdev_is_power_actor(cdev))
|
|
return -EINVAL;
|
|
|
|
ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
|
|
if (ret)
|
|
return ret;
|
|
|
|
instance->target = state;
|
|
mutex_lock(&cdev->lock);
|
|
cdev->updated = false;
|
|
mutex_unlock(&cdev->lock);
|
|
thermal_cdev_update(cdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void thermal_zone_device_rebind_exception(struct thermal_zone_device *tz,
|
|
const char *cdev_type, size_t size)
|
|
{
|
|
struct thermal_cooling_device *cdev = NULL;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(cdev, &thermal_cdev_list, node) {
|
|
/* skip non matching cdevs */
|
|
if (strncmp(cdev_type, cdev->type, size))
|
|
continue;
|
|
|
|
/* re binding the exception matching the type pattern */
|
|
thermal_zone_bind_cooling_device(tz, THERMAL_TRIPS_NONE, cdev,
|
|
THERMAL_NO_LIMIT,
|
|
THERMAL_NO_LIMIT,
|
|
THERMAL_WEIGHT_DEFAULT);
|
|
}
|
|
mutex_unlock(&thermal_list_lock);
|
|
}
|
|
|
|
void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz,
|
|
const char *cdev_type, size_t size)
|
|
{
|
|
struct thermal_cooling_device *cdev = NULL;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(cdev, &thermal_cdev_list, node) {
|
|
/* skip non matching cdevs */
|
|
if (strncmp(cdev_type, cdev->type, size))
|
|
continue;
|
|
/* unbinding the exception matching the type pattern */
|
|
thermal_zone_unbind_cooling_device(tz, THERMAL_TRIPS_NONE,
|
|
cdev);
|
|
}
|
|
mutex_unlock(&thermal_list_lock);
|
|
}
|
|
|
|
/*
|
|
* Device management section: cooling devices, zones devices, and binding
|
|
*
|
|
* Set of functions provided by the thermal core for:
|
|
* - cooling devices lifecycle: registration, unregistration,
|
|
* binding, and unbinding.
|
|
* - thermal zone devices lifecycle: registration, unregistration,
|
|
* binding, and unbinding.
|
|
*/
|
|
|
|
/**
|
|
* thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
|
|
* @tz: pointer to struct thermal_zone_device
|
|
* @trip: indicates which trip point the cooling devices is
|
|
* associated with in this thermal zone.
|
|
* @cdev: pointer to struct thermal_cooling_device
|
|
* @upper: the Maximum cooling state for this trip point.
|
|
* THERMAL_NO_LIMIT means no upper limit,
|
|
* and the cooling device can be in max_state.
|
|
* @lower: the Minimum cooling state can be used for this trip point.
|
|
* THERMAL_NO_LIMIT means no lower limit,
|
|
* and the cooling device can be in cooling state 0.
|
|
* @weight: The weight of the cooling device to be bound to the
|
|
* thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
|
|
* default value
|
|
*
|
|
* This interface function bind a thermal cooling device to the certain trip
|
|
* point of a thermal zone device.
|
|
* This function is usually called in the thermal zone device .bind callback.
|
|
*
|
|
* Return: 0 on success, the proper error value otherwise.
|
|
*/
|
|
int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
|
|
int trip,
|
|
struct thermal_cooling_device *cdev,
|
|
unsigned long upper, unsigned long lower,
|
|
unsigned int weight)
|
|
{
|
|
struct thermal_instance *dev;
|
|
struct thermal_instance *pos;
|
|
struct thermal_zone_device *pos1;
|
|
struct thermal_cooling_device *pos2;
|
|
unsigned long max_state;
|
|
int result, ret;
|
|
|
|
if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
|
|
return -EINVAL;
|
|
|
|
list_for_each_entry(pos1, &thermal_tz_list, node) {
|
|
if (pos1 == tz)
|
|
break;
|
|
}
|
|
list_for_each_entry(pos2, &thermal_cdev_list, node) {
|
|
if (pos2 == cdev)
|
|
break;
|
|
}
|
|
|
|
if (tz != pos1 || cdev != pos2)
|
|
return -EINVAL;
|
|
|
|
ret = cdev->ops->get_max_state(cdev, &max_state);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* lower default 0, upper default max_state */
|
|
lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
|
|
upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
|
|
|
|
if (lower > upper || upper > max_state)
|
|
return -EINVAL;
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
dev->tz = tz;
|
|
dev->cdev = cdev;
|
|
dev->trip = trip;
|
|
dev->upper = upper;
|
|
dev->lower = lower;
|
|
dev->target = THERMAL_NO_TARGET;
|
|
dev->weight = weight;
|
|
|
|
result = ida_simple_get(&tz->ida, 0, 0, GFP_KERNEL);
|
|
if (result < 0)
|
|
goto free_mem;
|
|
|
|
dev->id = result;
|
|
sprintf(dev->name, "cdev%d", dev->id);
|
|
result =
|
|
sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
|
|
if (result)
|
|
goto release_ida;
|
|
|
|
sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
|
|
sysfs_attr_init(&dev->attr.attr);
|
|
dev->attr.attr.name = dev->attr_name;
|
|
dev->attr.attr.mode = 0444;
|
|
dev->attr.show = trip_point_show;
|
|
result = device_create_file(&tz->device, &dev->attr);
|
|
if (result)
|
|
goto remove_symbol_link;
|
|
|
|
sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
|
|
sysfs_attr_init(&dev->weight_attr.attr);
|
|
dev->weight_attr.attr.name = dev->weight_attr_name;
|
|
dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
|
|
dev->weight_attr.show = weight_show;
|
|
dev->weight_attr.store = weight_store;
|
|
result = device_create_file(&tz->device, &dev->weight_attr);
|
|
if (result)
|
|
goto remove_trip_file;
|
|
|
|
mutex_lock(&tz->lock);
|
|
mutex_lock(&cdev->lock);
|
|
list_for_each_entry(pos, &tz->thermal_instances, tz_node)
|
|
if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
|
|
result = -EEXIST;
|
|
break;
|
|
}
|
|
if (!result) {
|
|
list_add_tail(&dev->tz_node, &tz->thermal_instances);
|
|
list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
|
|
atomic_set(&tz->need_update, 1);
|
|
}
|
|
mutex_unlock(&cdev->lock);
|
|
mutex_unlock(&tz->lock);
|
|
|
|
if (!result)
|
|
return 0;
|
|
|
|
device_remove_file(&tz->device, &dev->weight_attr);
|
|
remove_trip_file:
|
|
device_remove_file(&tz->device, &dev->attr);
|
|
remove_symbol_link:
|
|
sysfs_remove_link(&tz->device.kobj, dev->name);
|
|
release_ida:
|
|
ida_simple_remove(&tz->ida, dev->id);
|
|
free_mem:
|
|
kfree(dev);
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
|
|
|
|
/**
|
|
* thermal_zone_unbind_cooling_device() - unbind a cooling device from a
|
|
* thermal zone.
|
|
* @tz: pointer to a struct thermal_zone_device.
|
|
* @trip: indicates which trip point the cooling devices is
|
|
* associated with in this thermal zone.
|
|
* @cdev: pointer to a struct thermal_cooling_device.
|
|
*
|
|
* This interface function unbind a thermal cooling device from the certain
|
|
* trip point of a thermal zone device.
|
|
* This function is usually called in the thermal zone device .unbind callback.
|
|
*
|
|
* Return: 0 on success, the proper error value otherwise.
|
|
*/
|
|
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
|
|
int trip,
|
|
struct thermal_cooling_device *cdev)
|
|
{
|
|
struct thermal_instance *pos, *next;
|
|
|
|
mutex_lock(&tz->lock);
|
|
mutex_lock(&cdev->lock);
|
|
list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
|
|
if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
|
|
list_del(&pos->tz_node);
|
|
list_del(&pos->cdev_node);
|
|
mutex_unlock(&cdev->lock);
|
|
mutex_unlock(&tz->lock);
|
|
goto unbind;
|
|
}
|
|
}
|
|
mutex_unlock(&cdev->lock);
|
|
mutex_unlock(&tz->lock);
|
|
|
|
return -ENODEV;
|
|
|
|
unbind:
|
|
device_remove_file(&tz->device, &pos->weight_attr);
|
|
device_remove_file(&tz->device, &pos->attr);
|
|
sysfs_remove_link(&tz->device.kobj, pos->name);
|
|
ida_simple_remove(&tz->ida, pos->id);
|
|
kfree(pos);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
|
|
|
|
static void thermal_release(struct device *dev)
|
|
{
|
|
struct thermal_zone_device *tz;
|
|
struct thermal_cooling_device *cdev;
|
|
|
|
if (!strncmp(dev_name(dev), "thermal_zone",
|
|
sizeof("thermal_zone") - 1)) {
|
|
tz = to_thermal_zone(dev);
|
|
thermal_zone_destroy_device_groups(tz);
|
|
kfree(tz);
|
|
} else if (!strncmp(dev_name(dev), "cooling_device",
|
|
sizeof("cooling_device") - 1)) {
|
|
cdev = to_cooling_device(dev);
|
|
kfree(cdev);
|
|
}
|
|
}
|
|
|
|
static struct class thermal_class = {
|
|
.name = "thermal",
|
|
.dev_release = thermal_release,
|
|
};
|
|
|
|
static inline
|
|
void print_bind_err_msg(struct thermal_zone_device *tz,
|
|
struct thermal_cooling_device *cdev, int ret)
|
|
{
|
|
dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
|
|
tz->type, cdev->type, ret);
|
|
}
|
|
|
|
static void __bind(struct thermal_zone_device *tz, int mask,
|
|
struct thermal_cooling_device *cdev,
|
|
unsigned long *limits,
|
|
unsigned int weight)
|
|
{
|
|
int i, ret;
|
|
|
|
for (i = 0; i < tz->trips; i++) {
|
|
if (mask & (1 << i)) {
|
|
unsigned long upper, lower;
|
|
|
|
upper = THERMAL_NO_LIMIT;
|
|
lower = THERMAL_NO_LIMIT;
|
|
if (limits) {
|
|
lower = limits[i * 2];
|
|
upper = limits[i * 2 + 1];
|
|
}
|
|
ret = thermal_zone_bind_cooling_device(tz, i, cdev,
|
|
upper, lower,
|
|
weight);
|
|
if (ret)
|
|
print_bind_err_msg(tz, cdev, ret);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void bind_cdev(struct thermal_cooling_device *cdev)
|
|
{
|
|
int i, ret;
|
|
const struct thermal_zone_params *tzp;
|
|
struct thermal_zone_device *pos = NULL;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
|
|
list_for_each_entry(pos, &thermal_tz_list, node) {
|
|
if (!pos->tzp && !pos->ops->bind)
|
|
continue;
|
|
|
|
if (pos->ops->bind) {
|
|
ret = pos->ops->bind(pos, cdev);
|
|
if (ret)
|
|
print_bind_err_msg(pos, cdev, ret);
|
|
continue;
|
|
}
|
|
|
|
tzp = pos->tzp;
|
|
if (!tzp || !tzp->tbp)
|
|
continue;
|
|
|
|
for (i = 0; i < tzp->num_tbps; i++) {
|
|
if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
|
|
continue;
|
|
if (tzp->tbp[i].match(pos, cdev))
|
|
continue;
|
|
tzp->tbp[i].cdev = cdev;
|
|
__bind(pos, tzp->tbp[i].trip_mask, cdev,
|
|
tzp->tbp[i].binding_limits,
|
|
tzp->tbp[i].weight);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&thermal_list_lock);
|
|
}
|
|
|
|
/**
|
|
* __thermal_cooling_device_register() - register a new thermal cooling device
|
|
* @np: a pointer to a device tree node.
|
|
* @type: the thermal cooling device type.
|
|
* @devdata: device private data.
|
|
* @ops: standard thermal cooling devices callbacks.
|
|
*
|
|
* This interface function adds a new thermal cooling device (fan/processor/...)
|
|
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
|
|
* to all the thermal zone devices registered at the same time.
|
|
* It also gives the opportunity to link the cooling device to a device tree
|
|
* node, so that it can be bound to a thermal zone created out of device tree.
|
|
*
|
|
* Return: a pointer to the created struct thermal_cooling_device or an
|
|
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
|
|
*/
|
|
static struct thermal_cooling_device *
|
|
__thermal_cooling_device_register(struct device_node *np,
|
|
const char *type, void *devdata,
|
|
const struct thermal_cooling_device_ops *ops)
|
|
{
|
|
struct thermal_cooling_device *cdev;
|
|
struct thermal_zone_device *pos = NULL;
|
|
int result;
|
|
|
|
if (type && strlen(type) >= THERMAL_NAME_LENGTH)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!ops || !ops->get_max_state || !ops->get_cur_state ||
|
|
!ops->set_cur_state)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
|
|
if (!cdev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
result = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL);
|
|
if (result < 0) {
|
|
kfree(cdev);
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
cdev->id = result;
|
|
strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
|
|
mutex_init(&cdev->lock);
|
|
INIT_LIST_HEAD(&cdev->thermal_instances);
|
|
cdev->np = np;
|
|
cdev->ops = ops;
|
|
cdev->updated = false;
|
|
cdev->device.class = &thermal_class;
|
|
cdev->devdata = devdata;
|
|
thermal_cooling_device_setup_sysfs(cdev);
|
|
dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
|
|
result = device_register(&cdev->device);
|
|
if (result) {
|
|
ida_simple_remove(&thermal_cdev_ida, cdev->id);
|
|
put_device(&cdev->device);
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
/* Add 'this' new cdev to the global cdev list */
|
|
mutex_lock(&thermal_list_lock);
|
|
list_add(&cdev->node, &thermal_cdev_list);
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
/* Update binding information for 'this' new cdev */
|
|
bind_cdev(cdev);
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(pos, &thermal_tz_list, node)
|
|
if (atomic_cmpxchg(&pos->need_update, 1, 0))
|
|
thermal_zone_device_update(pos,
|
|
THERMAL_EVENT_UNSPECIFIED);
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
return cdev;
|
|
}
|
|
|
|
/**
|
|
* thermal_cooling_device_register() - register a new thermal cooling device
|
|
* @type: the thermal cooling device type.
|
|
* @devdata: device private data.
|
|
* @ops: standard thermal cooling devices callbacks.
|
|
*
|
|
* This interface function adds a new thermal cooling device (fan/processor/...)
|
|
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
|
|
* to all the thermal zone devices registered at the same time.
|
|
*
|
|
* Return: a pointer to the created struct thermal_cooling_device or an
|
|
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
|
|
*/
|
|
struct thermal_cooling_device *
|
|
thermal_cooling_device_register(const char *type, void *devdata,
|
|
const struct thermal_cooling_device_ops *ops)
|
|
{
|
|
return __thermal_cooling_device_register(NULL, type, devdata, ops);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
|
|
|
|
/**
|
|
* thermal_of_cooling_device_register() - register an OF thermal cooling device
|
|
* @np: a pointer to a device tree node.
|
|
* @type: the thermal cooling device type.
|
|
* @devdata: device private data.
|
|
* @ops: standard thermal cooling devices callbacks.
|
|
*
|
|
* This function will register a cooling device with device tree node reference.
|
|
* This interface function adds a new thermal cooling device (fan/processor/...)
|
|
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
|
|
* to all the thermal zone devices registered at the same time.
|
|
*
|
|
* Return: a pointer to the created struct thermal_cooling_device or an
|
|
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
|
|
*/
|
|
struct thermal_cooling_device *
|
|
thermal_of_cooling_device_register(struct device_node *np,
|
|
const char *type, void *devdata,
|
|
const struct thermal_cooling_device_ops *ops)
|
|
{
|
|
return __thermal_cooling_device_register(np, type, devdata, ops);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
|
|
|
|
static void thermal_cooling_device_release(struct device *dev, void *res)
|
|
{
|
|
thermal_cooling_device_unregister(
|
|
*(struct thermal_cooling_device **)res);
|
|
}
|
|
|
|
/**
|
|
* devm_thermal_of_cooling_device_register() - register an OF thermal cooling
|
|
* device
|
|
* @dev: a valid struct device pointer of a sensor device.
|
|
* @np: a pointer to a device tree node.
|
|
* @type: the thermal cooling device type.
|
|
* @devdata: device private data.
|
|
* @ops: standard thermal cooling devices callbacks.
|
|
*
|
|
* This function will register a cooling device with device tree node reference.
|
|
* This interface function adds a new thermal cooling device (fan/processor/...)
|
|
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
|
|
* to all the thermal zone devices registered at the same time.
|
|
*
|
|
* Return: a pointer to the created struct thermal_cooling_device or an
|
|
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
|
|
*/
|
|
struct thermal_cooling_device *
|
|
devm_thermal_of_cooling_device_register(struct device *dev,
|
|
struct device_node *np,
|
|
char *type, void *devdata,
|
|
const struct thermal_cooling_device_ops *ops)
|
|
{
|
|
struct thermal_cooling_device **ptr, *tcd;
|
|
|
|
ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr),
|
|
GFP_KERNEL);
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
tcd = __thermal_cooling_device_register(np, type, devdata, ops);
|
|
if (IS_ERR(tcd)) {
|
|
devres_free(ptr);
|
|
return tcd;
|
|
}
|
|
|
|
*ptr = tcd;
|
|
devres_add(dev, ptr);
|
|
|
|
return tcd;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register);
|
|
|
|
static void __unbind(struct thermal_zone_device *tz, int mask,
|
|
struct thermal_cooling_device *cdev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < tz->trips; i++)
|
|
if (mask & (1 << i))
|
|
thermal_zone_unbind_cooling_device(tz, i, cdev);
|
|
}
|
|
|
|
/**
|
|
* thermal_cooling_device_unregister - removes a thermal cooling device
|
|
* @cdev: the thermal cooling device to remove.
|
|
*
|
|
* thermal_cooling_device_unregister() must be called when a registered
|
|
* thermal cooling device is no longer needed.
|
|
*/
|
|
void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
|
|
{
|
|
int i;
|
|
const struct thermal_zone_params *tzp;
|
|
struct thermal_zone_device *tz;
|
|
struct thermal_cooling_device *pos = NULL;
|
|
|
|
if (!cdev)
|
|
return;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(pos, &thermal_cdev_list, node)
|
|
if (pos == cdev)
|
|
break;
|
|
if (pos != cdev) {
|
|
/* thermal cooling device not found */
|
|
mutex_unlock(&thermal_list_lock);
|
|
return;
|
|
}
|
|
list_del(&cdev->node);
|
|
|
|
/* Unbind all thermal zones associated with 'this' cdev */
|
|
list_for_each_entry(tz, &thermal_tz_list, node) {
|
|
if (tz->ops->unbind) {
|
|
tz->ops->unbind(tz, cdev);
|
|
continue;
|
|
}
|
|
|
|
if (!tz->tzp || !tz->tzp->tbp)
|
|
continue;
|
|
|
|
tzp = tz->tzp;
|
|
for (i = 0; i < tzp->num_tbps; i++) {
|
|
if (tzp->tbp[i].cdev == cdev) {
|
|
__unbind(tz, tzp->tbp[i].trip_mask, cdev);
|
|
tzp->tbp[i].cdev = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
ida_simple_remove(&thermal_cdev_ida, cdev->id);
|
|
device_del(&cdev->device);
|
|
thermal_cooling_device_destroy_sysfs(cdev);
|
|
put_device(&cdev->device);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
|
|
|
|
static void bind_tz(struct thermal_zone_device *tz)
|
|
{
|
|
int i, ret;
|
|
struct thermal_cooling_device *pos = NULL;
|
|
const struct thermal_zone_params *tzp = tz->tzp;
|
|
|
|
if (!tzp && !tz->ops->bind)
|
|
return;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
|
|
/* If there is ops->bind, try to use ops->bind */
|
|
if (tz->ops->bind) {
|
|
list_for_each_entry(pos, &thermal_cdev_list, node) {
|
|
ret = tz->ops->bind(tz, pos);
|
|
if (ret)
|
|
print_bind_err_msg(tz, pos, ret);
|
|
}
|
|
goto exit;
|
|
}
|
|
|
|
if (!tzp || !tzp->tbp)
|
|
goto exit;
|
|
|
|
list_for_each_entry(pos, &thermal_cdev_list, node) {
|
|
for (i = 0; i < tzp->num_tbps; i++) {
|
|
if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
|
|
continue;
|
|
if (tzp->tbp[i].match(tz, pos))
|
|
continue;
|
|
tzp->tbp[i].cdev = pos;
|
|
__bind(tz, tzp->tbp[i].trip_mask, pos,
|
|
tzp->tbp[i].binding_limits,
|
|
tzp->tbp[i].weight);
|
|
}
|
|
}
|
|
exit:
|
|
mutex_unlock(&thermal_list_lock);
|
|
}
|
|
|
|
/**
|
|
* thermal_zone_device_register() - register a new thermal zone device
|
|
* @type: the thermal zone device type
|
|
* @trips: the number of trip points the thermal zone support
|
|
* @mask: a bit string indicating the writeablility of trip points
|
|
* @devdata: private device data
|
|
* @ops: standard thermal zone device callbacks
|
|
* @tzp: thermal zone platform parameters
|
|
* @passive_delay: number of milliseconds to wait between polls when
|
|
* performing passive cooling
|
|
* @polling_delay: number of milliseconds to wait between polls when checking
|
|
* whether trip points have been crossed (0 for interrupt
|
|
* driven systems)
|
|
*
|
|
* This interface function adds a new thermal zone device (sensor) to
|
|
* /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
|
|
* thermal cooling devices registered at the same time.
|
|
* thermal_zone_device_unregister() must be called when the device is no
|
|
* longer needed. The passive cooling depends on the .get_trend() return value.
|
|
*
|
|
* Return: a pointer to the created struct thermal_zone_device or an
|
|
* in case of error, an ERR_PTR. Caller must check return value with
|
|
* IS_ERR*() helpers.
|
|
*/
|
|
struct thermal_zone_device *
|
|
thermal_zone_device_register(const char *type, int trips, int mask,
|
|
void *devdata, struct thermal_zone_device_ops *ops,
|
|
struct thermal_zone_params *tzp, int passive_delay,
|
|
int polling_delay)
|
|
{
|
|
struct thermal_zone_device *tz;
|
|
enum thermal_trip_type trip_type;
|
|
int trip_temp;
|
|
int id;
|
|
int result;
|
|
int count;
|
|
struct thermal_governor *governor;
|
|
|
|
if (!type || strlen(type) == 0) {
|
|
pr_err("Error: No thermal zone type defined\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (type && strlen(type) >= THERMAL_NAME_LENGTH) {
|
|
pr_err("Error: Thermal zone name (%s) too long, should be under %d chars\n",
|
|
type, THERMAL_NAME_LENGTH);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) {
|
|
pr_err("Error: Incorrect number of thermal trips\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (!ops) {
|
|
pr_err("Error: Thermal zone device ops not defined\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
tz = kzalloc(sizeof(*tz), GFP_KERNEL);
|
|
if (!tz)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
INIT_LIST_HEAD(&tz->thermal_instances);
|
|
ida_init(&tz->ida);
|
|
mutex_init(&tz->lock);
|
|
id = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL);
|
|
if (id < 0) {
|
|
result = id;
|
|
goto free_tz;
|
|
}
|
|
|
|
tz->id = id;
|
|
strlcpy(tz->type, type, sizeof(tz->type));
|
|
tz->ops = ops;
|
|
tz->tzp = tzp;
|
|
tz->device.class = &thermal_class;
|
|
tz->devdata = devdata;
|
|
tz->trips = trips;
|
|
tz->passive_delay = passive_delay;
|
|
tz->polling_delay = polling_delay;
|
|
|
|
/* sys I/F */
|
|
/* Add nodes that are always present via .groups */
|
|
result = thermal_zone_create_device_groups(tz, mask);
|
|
if (result)
|
|
goto remove_id;
|
|
|
|
/* A new thermal zone needs to be updated anyway. */
|
|
atomic_set(&tz->need_update, 1);
|
|
|
|
dev_set_name(&tz->device, "thermal_zone%d", tz->id);
|
|
result = device_register(&tz->device);
|
|
if (result)
|
|
goto release_device;
|
|
|
|
for (count = 0; count < trips; count++) {
|
|
if (tz->ops->get_trip_type(tz, count, &trip_type))
|
|
set_bit(count, &tz->trips_disabled);
|
|
if (tz->ops->get_trip_temp(tz, count, &trip_temp))
|
|
set_bit(count, &tz->trips_disabled);
|
|
/* Check for bogus trip points */
|
|
if (trip_temp == 0)
|
|
set_bit(count, &tz->trips_disabled);
|
|
}
|
|
|
|
/* Update 'this' zone's governor information */
|
|
mutex_lock(&thermal_governor_lock);
|
|
|
|
if (tz->tzp)
|
|
governor = __find_governor(tz->tzp->governor_name);
|
|
else
|
|
governor = def_governor;
|
|
|
|
result = thermal_set_governor(tz, governor);
|
|
if (result) {
|
|
mutex_unlock(&thermal_governor_lock);
|
|
goto unregister;
|
|
}
|
|
|
|
mutex_unlock(&thermal_governor_lock);
|
|
|
|
if (!tz->tzp || !tz->tzp->no_hwmon) {
|
|
result = thermal_add_hwmon_sysfs(tz);
|
|
if (result)
|
|
goto unregister;
|
|
}
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_add_tail(&tz->node, &thermal_tz_list);
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
/* Bind cooling devices for this zone */
|
|
bind_tz(tz);
|
|
|
|
INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check);
|
|
|
|
thermal_zone_device_reset(tz);
|
|
/* Update the new thermal zone and mark it as already updated. */
|
|
if (atomic_cmpxchg(&tz->need_update, 1, 0))
|
|
thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
|
|
|
|
return tz;
|
|
|
|
unregister:
|
|
device_del(&tz->device);
|
|
release_device:
|
|
put_device(&tz->device);
|
|
tz = NULL;
|
|
remove_id:
|
|
ida_simple_remove(&thermal_tz_ida, id);
|
|
free_tz:
|
|
kfree(tz);
|
|
return ERR_PTR(result);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_zone_device_register);
|
|
|
|
/**
|
|
* thermal_device_unregister - removes the registered thermal zone device
|
|
* @tz: the thermal zone device to remove
|
|
*/
|
|
void thermal_zone_device_unregister(struct thermal_zone_device *tz)
|
|
{
|
|
int i;
|
|
const struct thermal_zone_params *tzp;
|
|
struct thermal_cooling_device *cdev;
|
|
struct thermal_zone_device *pos = NULL;
|
|
|
|
if (!tz)
|
|
return;
|
|
|
|
tzp = tz->tzp;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(pos, &thermal_tz_list, node)
|
|
if (pos == tz)
|
|
break;
|
|
if (pos != tz) {
|
|
/* thermal zone device not found */
|
|
mutex_unlock(&thermal_list_lock);
|
|
return;
|
|
}
|
|
list_del(&tz->node);
|
|
|
|
/* Unbind all cdevs associated with 'this' thermal zone */
|
|
list_for_each_entry(cdev, &thermal_cdev_list, node) {
|
|
if (tz->ops->unbind) {
|
|
tz->ops->unbind(tz, cdev);
|
|
continue;
|
|
}
|
|
|
|
if (!tzp || !tzp->tbp)
|
|
break;
|
|
|
|
for (i = 0; i < tzp->num_tbps; i++) {
|
|
if (tzp->tbp[i].cdev == cdev) {
|
|
__unbind(tz, tzp->tbp[i].trip_mask, cdev);
|
|
tzp->tbp[i].cdev = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
cancel_delayed_work_sync(&tz->poll_queue);
|
|
|
|
thermal_set_governor(tz, NULL);
|
|
|
|
thermal_remove_hwmon_sysfs(tz);
|
|
ida_simple_remove(&thermal_tz_ida, tz->id);
|
|
ida_destroy(&tz->ida);
|
|
mutex_destroy(&tz->lock);
|
|
device_unregister(&tz->device);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
|
|
|
|
/**
|
|
* thermal_zone_get_zone_by_name() - search for a zone and returns its ref
|
|
* @name: thermal zone name to fetch the temperature
|
|
*
|
|
* When only one zone is found with the passed name, returns a reference to it.
|
|
*
|
|
* Return: On success returns a reference to an unique thermal zone with
|
|
* matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
|
|
* paramenters, -ENODEV for not found and -EEXIST for multiple matches).
|
|
*/
|
|
struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
|
|
{
|
|
struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
|
|
unsigned int found = 0;
|
|
|
|
if (!name)
|
|
goto exit;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(pos, &thermal_tz_list, node)
|
|
if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
|
|
found++;
|
|
ref = pos;
|
|
}
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
/* nothing has been found, thus an error code for it */
|
|
if (found == 0)
|
|
ref = ERR_PTR(-ENODEV);
|
|
else if (found > 1)
|
|
/* Success only when an unique zone is found */
|
|
ref = ERR_PTR(-EEXIST);
|
|
|
|
exit:
|
|
return ref;
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
|
|
|
|
static int thermal_pm_notify(struct notifier_block *nb,
|
|
unsigned long mode, void *_unused)
|
|
{
|
|
struct thermal_zone_device *tz;
|
|
enum thermal_device_mode tz_mode;
|
|
|
|
switch (mode) {
|
|
case PM_HIBERNATION_PREPARE:
|
|
case PM_RESTORE_PREPARE:
|
|
case PM_SUSPEND_PREPARE:
|
|
atomic_set(&in_suspend, 1);
|
|
break;
|
|
case PM_POST_HIBERNATION:
|
|
case PM_POST_RESTORE:
|
|
case PM_POST_SUSPEND:
|
|
atomic_set(&in_suspend, 0);
|
|
list_for_each_entry(tz, &thermal_tz_list, node) {
|
|
tz_mode = THERMAL_DEVICE_ENABLED;
|
|
if (tz->ops->get_mode)
|
|
tz->ops->get_mode(tz, &tz_mode);
|
|
|
|
if (tz_mode == THERMAL_DEVICE_DISABLED)
|
|
continue;
|
|
|
|
thermal_zone_device_init(tz);
|
|
thermal_zone_device_update(tz,
|
|
THERMAL_EVENT_UNSPECIFIED);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block thermal_pm_nb = {
|
|
.notifier_call = thermal_pm_notify,
|
|
};
|
|
|
|
static int __init thermal_init(void)
|
|
{
|
|
int result;
|
|
|
|
mutex_init(&poweroff_lock);
|
|
result = thermal_register_governors();
|
|
if (result)
|
|
goto error;
|
|
|
|
result = class_register(&thermal_class);
|
|
if (result)
|
|
goto unregister_governors;
|
|
|
|
result = of_parse_thermal_zones();
|
|
if (result)
|
|
goto unregister_class;
|
|
|
|
result = register_pm_notifier(&thermal_pm_nb);
|
|
if (result)
|
|
pr_warn("Thermal: Can not register suspend notifier, return %d\n",
|
|
result);
|
|
|
|
return 0;
|
|
|
|
unregister_class:
|
|
class_unregister(&thermal_class);
|
|
unregister_governors:
|
|
thermal_unregister_governors();
|
|
error:
|
|
ida_destroy(&thermal_tz_ida);
|
|
ida_destroy(&thermal_cdev_ida);
|
|
mutex_destroy(&thermal_list_lock);
|
|
mutex_destroy(&thermal_governor_lock);
|
|
mutex_destroy(&poweroff_lock);
|
|
return result;
|
|
}
|
|
core_initcall(thermal_init);
|