mirror of https://gitee.com/openkylin/linux.git
821 lines
24 KiB
C
821 lines
24 KiB
C
/*
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* linux/drivers/thermal/cpu_cooling.c
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*
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* Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
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* Copyright (C) 2012 Amit Daniel <amit.kachhap@linaro.org>
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*
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* Copyright (C) 2014 Viresh Kumar <viresh.kumar@linaro.org>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/module.h>
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#include <linux/thermal.h>
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#include <linux/cpufreq.h>
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#include <linux/err.h>
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#include <linux/idr.h>
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#include <linux/pm_opp.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <linux/cpu_cooling.h>
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#include <trace/events/thermal.h>
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/*
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* Cooling state <-> CPUFreq frequency
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*
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* Cooling states are translated to frequencies throughout this driver and this
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* is the relation between them.
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*
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* Highest cooling state corresponds to lowest possible frequency.
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*
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* i.e.
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* level 0 --> 1st Max Freq
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* level 1 --> 2nd Max Freq
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* ...
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*/
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/**
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* struct freq_table - frequency table along with power entries
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* @frequency: frequency in KHz
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* @power: power in mW
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*
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* This structure is built when the cooling device registers and helps
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* in translating frequency to power and vice versa.
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*/
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struct freq_table {
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u32 frequency;
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u32 power;
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};
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/**
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* struct time_in_idle - Idle time stats
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* @time: previous reading of the absolute time that this cpu was idle
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* @timestamp: wall time of the last invocation of get_cpu_idle_time_us()
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*/
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struct time_in_idle {
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u64 time;
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u64 timestamp;
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};
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/**
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* struct cpufreq_cooling_device - data for cooling device with cpufreq
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* @id: unique integer value corresponding to each cpufreq_cooling_device
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* registered.
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* @last_load: load measured by the latest call to cpufreq_get_requested_power()
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* @cpufreq_state: integer value representing the current state of cpufreq
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* cooling devices.
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* @clipped_freq: integer value representing the absolute value of the clipped
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* frequency.
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* @max_level: maximum cooling level. One less than total number of valid
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* cpufreq frequencies.
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* @freq_table: Freq table in descending order of frequencies
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* @cdev: thermal_cooling_device pointer to keep track of the
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* registered cooling device.
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* @policy: cpufreq policy.
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* @node: list_head to link all cpufreq_cooling_device together.
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* @idle_time: idle time stats
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*
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* This structure is required for keeping information of each registered
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* cpufreq_cooling_device.
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*/
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struct cpufreq_cooling_device {
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int id;
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u32 last_load;
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unsigned int cpufreq_state;
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unsigned int clipped_freq;
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unsigned int max_level;
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struct freq_table *freq_table; /* In descending order */
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struct thermal_cooling_device *cdev;
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struct cpufreq_policy *policy;
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struct list_head node;
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struct time_in_idle *idle_time;
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};
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static DEFINE_IDA(cpufreq_ida);
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static DEFINE_MUTEX(cooling_list_lock);
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static LIST_HEAD(cpufreq_cdev_list);
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/* Below code defines functions to be used for cpufreq as cooling device */
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/**
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* get_level: Find the level for a particular frequency
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* @cpufreq_cdev: cpufreq_cdev for which the property is required
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* @freq: Frequency
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*
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* Return: level corresponding to the frequency.
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*/
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static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev,
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unsigned int freq)
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{
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struct freq_table *freq_table = cpufreq_cdev->freq_table;
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unsigned long level;
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for (level = 1; level <= cpufreq_cdev->max_level; level++)
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if (freq > freq_table[level].frequency)
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break;
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return level - 1;
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}
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/**
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* cpufreq_thermal_notifier - notifier callback for cpufreq policy change.
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* @nb: struct notifier_block * with callback info.
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* @event: value showing cpufreq event for which this function invoked.
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* @data: callback-specific data
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*
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* Callback to hijack the notification on cpufreq policy transition.
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* Every time there is a change in policy, we will intercept and
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* update the cpufreq policy with thermal constraints.
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*
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* Return: 0 (success)
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*/
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static int cpufreq_thermal_notifier(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct cpufreq_policy *policy = data;
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unsigned long clipped_freq;
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struct cpufreq_cooling_device *cpufreq_cdev;
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if (event != CPUFREQ_ADJUST)
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return NOTIFY_DONE;
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mutex_lock(&cooling_list_lock);
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list_for_each_entry(cpufreq_cdev, &cpufreq_cdev_list, node) {
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/*
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* A new copy of the policy is sent to the notifier and can't
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* compare that directly.
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*/
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if (policy->cpu != cpufreq_cdev->policy->cpu)
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continue;
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/*
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* policy->max is the maximum allowed frequency defined by user
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* and clipped_freq is the maximum that thermal constraints
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* allow.
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*
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* If clipped_freq is lower than policy->max, then we need to
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* readjust policy->max.
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*
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* But, if clipped_freq is greater than policy->max, we don't
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* need to do anything.
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*/
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clipped_freq = cpufreq_cdev->clipped_freq;
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if (policy->max > clipped_freq)
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cpufreq_verify_within_limits(policy, 0, clipped_freq);
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break;
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}
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mutex_unlock(&cooling_list_lock);
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return NOTIFY_OK;
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}
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/**
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* update_freq_table() - Update the freq table with power numbers
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* @cpufreq_cdev: the cpufreq cooling device in which to update the table
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* @capacitance: dynamic power coefficient for these cpus
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*
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* Update the freq table with power numbers. This table will be used in
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* cpu_power_to_freq() and cpu_freq_to_power() to convert between power and
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* frequency efficiently. Power is stored in mW, frequency in KHz. The
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* resulting table is in descending order.
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*
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* Return: 0 on success, -EINVAL if there are no OPPs for any CPUs,
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* or -ENOMEM if we run out of memory.
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*/
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static int update_freq_table(struct cpufreq_cooling_device *cpufreq_cdev,
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u32 capacitance)
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{
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struct freq_table *freq_table = cpufreq_cdev->freq_table;
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struct dev_pm_opp *opp;
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struct device *dev = NULL;
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int num_opps = 0, cpu = cpufreq_cdev->policy->cpu, i;
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dev = get_cpu_device(cpu);
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if (unlikely(!dev)) {
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dev_warn(&cpufreq_cdev->cdev->device,
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"No cpu device for cpu %d\n", cpu);
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return -ENODEV;
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}
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num_opps = dev_pm_opp_get_opp_count(dev);
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if (num_opps < 0)
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return num_opps;
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/*
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* The cpufreq table is also built from the OPP table and so the count
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* should match.
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*/
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if (num_opps != cpufreq_cdev->max_level + 1) {
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dev_warn(dev, "Number of OPPs not matching with max_levels\n");
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return -EINVAL;
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}
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for (i = 0; i <= cpufreq_cdev->max_level; i++) {
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unsigned long freq = freq_table[i].frequency * 1000;
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u32 freq_mhz = freq_table[i].frequency / 1000;
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u64 power;
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u32 voltage_mv;
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/*
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* Find ceil frequency as 'freq' may be slightly lower than OPP
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* freq due to truncation while converting to kHz.
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*/
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opp = dev_pm_opp_find_freq_ceil(dev, &freq);
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if (IS_ERR(opp)) {
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dev_err(dev, "failed to get opp for %lu frequency\n",
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freq);
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return -EINVAL;
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}
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voltage_mv = dev_pm_opp_get_voltage(opp) / 1000;
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dev_pm_opp_put(opp);
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/*
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* Do the multiplication with MHz and millivolt so as
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* to not overflow.
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*/
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power = (u64)capacitance * freq_mhz * voltage_mv * voltage_mv;
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do_div(power, 1000000000);
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/* power is stored in mW */
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freq_table[i].power = power;
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}
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return 0;
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}
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static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_cdev,
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u32 freq)
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{
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int i;
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struct freq_table *freq_table = cpufreq_cdev->freq_table;
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for (i = 1; i <= cpufreq_cdev->max_level; i++)
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if (freq > freq_table[i].frequency)
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break;
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return freq_table[i - 1].power;
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}
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static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev,
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u32 power)
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{
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int i;
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struct freq_table *freq_table = cpufreq_cdev->freq_table;
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for (i = 1; i <= cpufreq_cdev->max_level; i++)
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if (power > freq_table[i].power)
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break;
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return freq_table[i - 1].frequency;
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}
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/**
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* get_load() - get load for a cpu since last updated
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* @cpufreq_cdev: &struct cpufreq_cooling_device for this cpu
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* @cpu: cpu number
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* @cpu_idx: index of the cpu in time_in_idle*
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*
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* Return: The average load of cpu @cpu in percentage since this
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* function was last called.
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*/
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static u32 get_load(struct cpufreq_cooling_device *cpufreq_cdev, int cpu,
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int cpu_idx)
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{
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u32 load;
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u64 now, now_idle, delta_time, delta_idle;
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struct time_in_idle *idle_time = &cpufreq_cdev->idle_time[cpu_idx];
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now_idle = get_cpu_idle_time(cpu, &now, 0);
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delta_idle = now_idle - idle_time->time;
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delta_time = now - idle_time->timestamp;
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if (delta_time <= delta_idle)
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load = 0;
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else
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load = div64_u64(100 * (delta_time - delta_idle), delta_time);
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idle_time->time = now_idle;
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idle_time->timestamp = now;
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return load;
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}
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/**
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* get_dynamic_power() - calculate the dynamic power
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* @cpufreq_cdev: &cpufreq_cooling_device for this cdev
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* @freq: current frequency
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*
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* Return: the dynamic power consumed by the cpus described by
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* @cpufreq_cdev.
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*/
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static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_cdev,
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unsigned long freq)
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{
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u32 raw_cpu_power;
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raw_cpu_power = cpu_freq_to_power(cpufreq_cdev, freq);
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return (raw_cpu_power * cpufreq_cdev->last_load) / 100;
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}
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/* cpufreq cooling device callback functions are defined below */
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/**
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* cpufreq_get_max_state - callback function to get the max cooling state.
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* @cdev: thermal cooling device pointer.
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* @state: fill this variable with the max cooling state.
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*
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* Callback for the thermal cooling device to return the cpufreq
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* max cooling state.
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*
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* Return: 0 on success, an error code otherwise.
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*/
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static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
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*state = cpufreq_cdev->max_level;
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return 0;
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}
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/**
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* cpufreq_get_cur_state - callback function to get the current cooling state.
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* @cdev: thermal cooling device pointer.
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* @state: fill this variable with the current cooling state.
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*
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* Callback for the thermal cooling device to return the cpufreq
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* current cooling state.
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*
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* Return: 0 on success, an error code otherwise.
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*/
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static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
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*state = cpufreq_cdev->cpufreq_state;
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return 0;
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}
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/**
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* cpufreq_set_cur_state - callback function to set the current cooling state.
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* @cdev: thermal cooling device pointer.
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* @state: set this variable to the current cooling state.
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*
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* Callback for the thermal cooling device to change the cpufreq
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* current cooling state.
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*
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* Return: 0 on success, an error code otherwise.
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*/
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static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
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unsigned long state)
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{
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struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
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unsigned int clip_freq;
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/* Request state should be less than max_level */
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if (WARN_ON(state > cpufreq_cdev->max_level))
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return -EINVAL;
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/* Check if the old cooling action is same as new cooling action */
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if (cpufreq_cdev->cpufreq_state == state)
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return 0;
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clip_freq = cpufreq_cdev->freq_table[state].frequency;
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cpufreq_cdev->cpufreq_state = state;
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cpufreq_cdev->clipped_freq = clip_freq;
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cpufreq_update_policy(cpufreq_cdev->policy->cpu);
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return 0;
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}
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/**
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* cpufreq_get_requested_power() - get the current power
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* @cdev: &thermal_cooling_device pointer
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* @tz: a valid thermal zone device pointer
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* @power: pointer in which to store the resulting power
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*
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* Calculate the current power consumption of the cpus in milliwatts
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* and store it in @power. This function should actually calculate
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* the requested power, but it's hard to get the frequency that
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* cpufreq would have assigned if there were no thermal limits.
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* Instead, we calculate the current power on the assumption that the
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* immediate future will look like the immediate past.
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*
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* We use the current frequency and the average load since this
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* function was last called. In reality, there could have been
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* multiple opps since this function was last called and that affects
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* the load calculation. While it's not perfectly accurate, this
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* simplification is good enough and works. REVISIT this, as more
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* complex code may be needed if experiments show that it's not
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* accurate enough.
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*
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* Return: 0 on success, -E* if getting the static power failed.
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*/
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static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev,
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struct thermal_zone_device *tz,
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u32 *power)
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{
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unsigned long freq;
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int i = 0, cpu;
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u32 total_load = 0;
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struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
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struct cpufreq_policy *policy = cpufreq_cdev->policy;
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u32 *load_cpu = NULL;
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freq = cpufreq_quick_get(policy->cpu);
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if (trace_thermal_power_cpu_get_power_enabled()) {
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u32 ncpus = cpumask_weight(policy->related_cpus);
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load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL);
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}
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for_each_cpu(cpu, policy->related_cpus) {
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u32 load;
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if (cpu_online(cpu))
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load = get_load(cpufreq_cdev, cpu, i);
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else
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load = 0;
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total_load += load;
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if (trace_thermal_power_cpu_limit_enabled() && load_cpu)
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load_cpu[i] = load;
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i++;
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}
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cpufreq_cdev->last_load = total_load;
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*power = get_dynamic_power(cpufreq_cdev, freq);
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if (load_cpu) {
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trace_thermal_power_cpu_get_power(policy->related_cpus, freq,
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load_cpu, i, *power);
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kfree(load_cpu);
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}
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return 0;
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}
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/**
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* cpufreq_state2power() - convert a cpu cdev state to power consumed
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* @cdev: &thermal_cooling_device pointer
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* @tz: a valid thermal zone device pointer
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* @state: cooling device state to be converted
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* @power: pointer in which to store the resulting power
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*
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* Convert cooling device state @state into power consumption in
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* milliwatts assuming 100% load. Store the calculated power in
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* @power.
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*
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* Return: 0 on success, -EINVAL if the cooling device state could not
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* be converted into a frequency or other -E* if there was an error
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* when calculating the static power.
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*/
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static int cpufreq_state2power(struct thermal_cooling_device *cdev,
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struct thermal_zone_device *tz,
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unsigned long state, u32 *power)
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{
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unsigned int freq, num_cpus;
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struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
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/* Request state should be less than max_level */
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if (WARN_ON(state > cpufreq_cdev->max_level))
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return -EINVAL;
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|
|
num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus);
|
|
|
|
freq = cpufreq_cdev->freq_table[state].frequency;
|
|
*power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cpufreq_power2state() - convert power to a cooling device state
|
|
* @cdev: &thermal_cooling_device pointer
|
|
* @tz: a valid thermal zone device pointer
|
|
* @power: power in milliwatts to be converted
|
|
* @state: pointer in which to store the resulting state
|
|
*
|
|
* Calculate a cooling device state for the cpus described by @cdev
|
|
* that would allow them to consume at most @power mW and store it in
|
|
* @state. Note that this calculation depends on external factors
|
|
* such as the cpu load or the current static power. Calling this
|
|
* function with the same power as input can yield different cooling
|
|
* device states depending on those external factors.
|
|
*
|
|
* Return: 0 on success, -ENODEV if no cpus are online or -EINVAL if
|
|
* the calculated frequency could not be converted to a valid state.
|
|
* The latter should not happen unless the frequencies available to
|
|
* cpufreq have changed since the initialization of the cpu cooling
|
|
* device.
|
|
*/
|
|
static int cpufreq_power2state(struct thermal_cooling_device *cdev,
|
|
struct thermal_zone_device *tz, u32 power,
|
|
unsigned long *state)
|
|
{
|
|
unsigned int cur_freq, target_freq;
|
|
u32 last_load, normalised_power;
|
|
struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
|
|
struct cpufreq_policy *policy = cpufreq_cdev->policy;
|
|
|
|
cur_freq = cpufreq_quick_get(policy->cpu);
|
|
power = power > 0 ? power : 0;
|
|
last_load = cpufreq_cdev->last_load ?: 1;
|
|
normalised_power = (power * 100) / last_load;
|
|
target_freq = cpu_power_to_freq(cpufreq_cdev, normalised_power);
|
|
|
|
*state = get_level(cpufreq_cdev, target_freq);
|
|
trace_thermal_power_cpu_limit(policy->related_cpus, target_freq, *state,
|
|
power);
|
|
return 0;
|
|
}
|
|
|
|
/* Bind cpufreq callbacks to thermal cooling device ops */
|
|
|
|
static struct thermal_cooling_device_ops cpufreq_cooling_ops = {
|
|
.get_max_state = cpufreq_get_max_state,
|
|
.get_cur_state = cpufreq_get_cur_state,
|
|
.set_cur_state = cpufreq_set_cur_state,
|
|
};
|
|
|
|
static struct thermal_cooling_device_ops cpufreq_power_cooling_ops = {
|
|
.get_max_state = cpufreq_get_max_state,
|
|
.get_cur_state = cpufreq_get_cur_state,
|
|
.set_cur_state = cpufreq_set_cur_state,
|
|
.get_requested_power = cpufreq_get_requested_power,
|
|
.state2power = cpufreq_state2power,
|
|
.power2state = cpufreq_power2state,
|
|
};
|
|
|
|
/* Notifier for cpufreq policy change */
|
|
static struct notifier_block thermal_cpufreq_notifier_block = {
|
|
.notifier_call = cpufreq_thermal_notifier,
|
|
};
|
|
|
|
static unsigned int find_next_max(struct cpufreq_frequency_table *table,
|
|
unsigned int prev_max)
|
|
{
|
|
struct cpufreq_frequency_table *pos;
|
|
unsigned int max = 0;
|
|
|
|
cpufreq_for_each_valid_entry(pos, table) {
|
|
if (pos->frequency > max && pos->frequency < prev_max)
|
|
max = pos->frequency;
|
|
}
|
|
|
|
return max;
|
|
}
|
|
|
|
/**
|
|
* __cpufreq_cooling_register - helper function to create cpufreq cooling device
|
|
* @np: a valid struct device_node to the cooling device device tree node
|
|
* @policy: cpufreq policy
|
|
* Normally this should be same as cpufreq policy->related_cpus.
|
|
* @capacitance: dynamic power coefficient for these cpus
|
|
*
|
|
* This interface function registers the cpufreq cooling device with the name
|
|
* "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
|
|
* cooling devices. It also gives the opportunity to link the cooling device
|
|
* with a device tree node, in order to bind it via the thermal DT code.
|
|
*
|
|
* Return: a valid struct thermal_cooling_device pointer on success,
|
|
* on failure, it returns a corresponding ERR_PTR().
|
|
*/
|
|
static struct thermal_cooling_device *
|
|
__cpufreq_cooling_register(struct device_node *np,
|
|
struct cpufreq_policy *policy, u32 capacitance)
|
|
{
|
|
struct thermal_cooling_device *cdev;
|
|
struct cpufreq_cooling_device *cpufreq_cdev;
|
|
char dev_name[THERMAL_NAME_LENGTH];
|
|
unsigned int freq, i, num_cpus;
|
|
int ret;
|
|
struct thermal_cooling_device_ops *cooling_ops;
|
|
bool first;
|
|
|
|
if (IS_ERR_OR_NULL(policy)) {
|
|
pr_err("%s: cpufreq policy isn't valid: %p\n", __func__, policy);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
i = cpufreq_table_count_valid_entries(policy);
|
|
if (!i) {
|
|
pr_debug("%s: CPUFreq table not found or has no valid entries\n",
|
|
__func__);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
cpufreq_cdev = kzalloc(sizeof(*cpufreq_cdev), GFP_KERNEL);
|
|
if (!cpufreq_cdev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
cpufreq_cdev->policy = policy;
|
|
num_cpus = cpumask_weight(policy->related_cpus);
|
|
cpufreq_cdev->idle_time = kcalloc(num_cpus,
|
|
sizeof(*cpufreq_cdev->idle_time),
|
|
GFP_KERNEL);
|
|
if (!cpufreq_cdev->idle_time) {
|
|
cdev = ERR_PTR(-ENOMEM);
|
|
goto free_cdev;
|
|
}
|
|
|
|
/* max_level is an index, not a counter */
|
|
cpufreq_cdev->max_level = i - 1;
|
|
|
|
cpufreq_cdev->freq_table = kmalloc_array(i,
|
|
sizeof(*cpufreq_cdev->freq_table),
|
|
GFP_KERNEL);
|
|
if (!cpufreq_cdev->freq_table) {
|
|
cdev = ERR_PTR(-ENOMEM);
|
|
goto free_idle_time;
|
|
}
|
|
|
|
ret = ida_simple_get(&cpufreq_ida, 0, 0, GFP_KERNEL);
|
|
if (ret < 0) {
|
|
cdev = ERR_PTR(ret);
|
|
goto free_table;
|
|
}
|
|
cpufreq_cdev->id = ret;
|
|
|
|
snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d",
|
|
cpufreq_cdev->id);
|
|
|
|
/* Fill freq-table in descending order of frequencies */
|
|
for (i = 0, freq = -1; i <= cpufreq_cdev->max_level; i++) {
|
|
freq = find_next_max(policy->freq_table, freq);
|
|
cpufreq_cdev->freq_table[i].frequency = freq;
|
|
|
|
/* Warn for duplicate entries */
|
|
if (!freq)
|
|
pr_warn("%s: table has duplicate entries\n", __func__);
|
|
else
|
|
pr_debug("%s: freq:%u KHz\n", __func__, freq);
|
|
}
|
|
|
|
if (capacitance) {
|
|
ret = update_freq_table(cpufreq_cdev, capacitance);
|
|
if (ret) {
|
|
cdev = ERR_PTR(ret);
|
|
goto remove_ida;
|
|
}
|
|
|
|
cooling_ops = &cpufreq_power_cooling_ops;
|
|
} else {
|
|
cooling_ops = &cpufreq_cooling_ops;
|
|
}
|
|
|
|
cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev,
|
|
cooling_ops);
|
|
if (IS_ERR(cdev))
|
|
goto remove_ida;
|
|
|
|
cpufreq_cdev->clipped_freq = cpufreq_cdev->freq_table[0].frequency;
|
|
cpufreq_cdev->cdev = cdev;
|
|
|
|
mutex_lock(&cooling_list_lock);
|
|
/* Register the notifier for first cpufreq cooling device */
|
|
first = list_empty(&cpufreq_cdev_list);
|
|
list_add(&cpufreq_cdev->node, &cpufreq_cdev_list);
|
|
mutex_unlock(&cooling_list_lock);
|
|
|
|
if (first)
|
|
cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
|
|
CPUFREQ_POLICY_NOTIFIER);
|
|
|
|
return cdev;
|
|
|
|
remove_ida:
|
|
ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id);
|
|
free_table:
|
|
kfree(cpufreq_cdev->freq_table);
|
|
free_idle_time:
|
|
kfree(cpufreq_cdev->idle_time);
|
|
free_cdev:
|
|
kfree(cpufreq_cdev);
|
|
return cdev;
|
|
}
|
|
|
|
/**
|
|
* cpufreq_cooling_register - function to create cpufreq cooling device.
|
|
* @policy: cpufreq policy
|
|
*
|
|
* This interface function registers the cpufreq cooling device with the name
|
|
* "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
|
|
* cooling devices.
|
|
*
|
|
* Return: a valid struct thermal_cooling_device pointer on success,
|
|
* on failure, it returns a corresponding ERR_PTR().
|
|
*/
|
|
struct thermal_cooling_device *
|
|
cpufreq_cooling_register(struct cpufreq_policy *policy)
|
|
{
|
|
return __cpufreq_cooling_register(NULL, policy, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_cooling_register);
|
|
|
|
/**
|
|
* of_cpufreq_cooling_register - function to create cpufreq cooling device.
|
|
* @policy: cpufreq policy
|
|
*
|
|
* This interface function registers the cpufreq cooling device with the name
|
|
* "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
|
|
* cooling devices. Using this API, the cpufreq cooling device will be
|
|
* linked to the device tree node provided.
|
|
*
|
|
* Using this function, the cooling device will implement the power
|
|
* extensions by using a simple cpu power model. The cpus must have
|
|
* registered their OPPs using the OPP library.
|
|
*
|
|
* It also takes into account, if property present in policy CPU node, the
|
|
* static power consumed by the cpu.
|
|
*
|
|
* Return: a valid struct thermal_cooling_device pointer on success,
|
|
* and NULL on failure.
|
|
*/
|
|
struct thermal_cooling_device *
|
|
of_cpufreq_cooling_register(struct cpufreq_policy *policy)
|
|
{
|
|
struct device_node *np = of_get_cpu_node(policy->cpu, NULL);
|
|
struct thermal_cooling_device *cdev = NULL;
|
|
u32 capacitance = 0;
|
|
|
|
if (!np) {
|
|
pr_err("cpu_cooling: OF node not available for cpu%d\n",
|
|
policy->cpu);
|
|
return NULL;
|
|
}
|
|
|
|
if (of_find_property(np, "#cooling-cells", NULL)) {
|
|
of_property_read_u32(np, "dynamic-power-coefficient",
|
|
&capacitance);
|
|
|
|
cdev = __cpufreq_cooling_register(np, policy, capacitance);
|
|
if (IS_ERR(cdev)) {
|
|
pr_err("cpu_cooling: cpu%d is not running as cooling device: %ld\n",
|
|
policy->cpu, PTR_ERR(cdev));
|
|
cdev = NULL;
|
|
}
|
|
}
|
|
|
|
of_node_put(np);
|
|
return cdev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register);
|
|
|
|
/**
|
|
* cpufreq_cooling_unregister - function to remove cpufreq cooling device.
|
|
* @cdev: thermal cooling device pointer.
|
|
*
|
|
* This interface function unregisters the "thermal-cpufreq-%x" cooling device.
|
|
*/
|
|
void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
|
|
{
|
|
struct cpufreq_cooling_device *cpufreq_cdev;
|
|
bool last;
|
|
|
|
if (!cdev)
|
|
return;
|
|
|
|
cpufreq_cdev = cdev->devdata;
|
|
|
|
mutex_lock(&cooling_list_lock);
|
|
list_del(&cpufreq_cdev->node);
|
|
/* Unregister the notifier for the last cpufreq cooling device */
|
|
last = list_empty(&cpufreq_cdev_list);
|
|
mutex_unlock(&cooling_list_lock);
|
|
|
|
if (last)
|
|
cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
|
|
CPUFREQ_POLICY_NOTIFIER);
|
|
|
|
thermal_cooling_device_unregister(cpufreq_cdev->cdev);
|
|
ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id);
|
|
kfree(cpufreq_cdev->idle_time);
|
|
kfree(cpufreq_cdev->freq_table);
|
|
kfree(cpufreq_cdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister);
|