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![Hugh Kang](/assets/img/avatar_default.png)
The last_load is updated not cpufreq_get_actual_power() function call but cpufreq_get_requested_power() function call. Signed-off-by: Inhyuk Kang <hugh.kang@lge.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Javi Merino <javi.merino@arm.com> Acked-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
1082 lines
32 KiB
C
1082 lines
32 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/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 power_table - frequency to power conversion
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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 viceversa.
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*/
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struct power_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 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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* @cool_dev: thermal_cooling_device pointer to keep track of the
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* registered cooling device.
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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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* @allowed_cpus: all the cpus involved for this cpufreq_cooling_device.
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* @node: list_head to link all cpufreq_cooling_device together.
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* @last_load: load measured by the latest call to cpufreq_get_requested_power()
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* @time_in_idle: previous reading of the absolute time that this cpu was idle
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* @time_in_idle_timestamp: wall time of the last invocation of
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* get_cpu_idle_time_us()
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* @dyn_power_table: array of struct power_table for frequency to power
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* conversion, sorted in ascending order.
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* @dyn_power_table_entries: number of entries in the @dyn_power_table array
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* @cpu_dev: the first cpu_device from @allowed_cpus that has OPPs registered
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* @plat_get_static_power: callback to calculate the static power
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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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struct thermal_cooling_device *cool_dev;
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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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unsigned int *freq_table; /* In descending order */
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struct cpumask allowed_cpus;
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struct list_head node;
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u32 last_load;
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u64 *time_in_idle;
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u64 *time_in_idle_timestamp;
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struct power_table *dyn_power_table;
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int dyn_power_table_entries;
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struct device *cpu_dev;
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get_static_t plat_get_static_power;
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};
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static DEFINE_IDR(cpufreq_idr);
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static DEFINE_MUTEX(cooling_cpufreq_lock);
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static unsigned int cpufreq_dev_count;
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static DEFINE_MUTEX(cooling_list_lock);
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static LIST_HEAD(cpufreq_dev_list);
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/**
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* get_idr - function to get a unique id.
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* @idr: struct idr * handle used to create a id.
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* @id: int * value generated by this function.
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*
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* This function will populate @id with an unique
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* id, using the idr API.
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*
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* Return: 0 on success, an error code on failure.
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*/
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static int get_idr(struct idr *idr, int *id)
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{
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int ret;
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mutex_lock(&cooling_cpufreq_lock);
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ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
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mutex_unlock(&cooling_cpufreq_lock);
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if (unlikely(ret < 0))
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return ret;
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*id = ret;
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return 0;
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}
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/**
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* release_idr - function to free the unique id.
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* @idr: struct idr * handle used for creating the id.
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* @id: int value representing the unique id.
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*/
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static void release_idr(struct idr *idr, int id)
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{
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mutex_lock(&cooling_cpufreq_lock);
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idr_remove(idr, id);
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mutex_unlock(&cooling_cpufreq_lock);
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}
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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_dev: cpufreq_dev for which the property is required
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* @freq: Frequency
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*
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* Return: level on success, THERMAL_CSTATE_INVALID on error.
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*/
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static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_dev,
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unsigned int freq)
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{
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unsigned long level;
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for (level = 0; level <= cpufreq_dev->max_level; level++) {
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if (freq == cpufreq_dev->freq_table[level])
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return level;
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if (freq > cpufreq_dev->freq_table[level])
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break;
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}
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return THERMAL_CSTATE_INVALID;
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}
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/**
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* cpufreq_cooling_get_level - for a given cpu, return the cooling level.
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* @cpu: cpu for which the level is required
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* @freq: the frequency of interest
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*
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* This function will match the cooling level corresponding to the
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* requested @freq and return it.
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*
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* Return: The matched cooling level on success or THERMAL_CSTATE_INVALID
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* otherwise.
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*/
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unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq)
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{
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struct cpufreq_cooling_device *cpufreq_dev;
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mutex_lock(&cooling_list_lock);
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list_for_each_entry(cpufreq_dev, &cpufreq_dev_list, node) {
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if (cpumask_test_cpu(cpu, &cpufreq_dev->allowed_cpus)) {
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mutex_unlock(&cooling_list_lock);
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return get_level(cpufreq_dev, freq);
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}
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}
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mutex_unlock(&cooling_list_lock);
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pr_err("%s: cpu:%d not part of any cooling device\n", __func__, cpu);
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return THERMAL_CSTATE_INVALID;
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}
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EXPORT_SYMBOL_GPL(cpufreq_cooling_get_level);
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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_dev;
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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_dev, &cpufreq_dev_list, node) {
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if (!cpumask_test_cpu(policy->cpu, &cpufreq_dev->allowed_cpus))
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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_dev->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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* build_dyn_power_table() - create a dynamic power to frequency table
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* @cpufreq_device: the cpufreq cooling device in which to store the table
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* @capacitance: dynamic power coefficient for these cpus
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*
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* Build a dynamic power to frequency table for this cpu and store it
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* in @cpufreq_device. This table will be used in cpu_power_to_freq() and
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* cpu_freq_to_power() to convert between power and frequency
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* efficiently. Power is stored in mW, frequency in KHz. The
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* resulting table is in ascending 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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* -ENOMEM if we run out of memory or -EAGAIN if an OPP was
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* added/enabled while the function was executing.
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*/
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static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device,
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u32 capacitance)
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{
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struct power_table *power_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, i, ret = 0;
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unsigned long freq;
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for_each_cpu(cpu, &cpufreq_device->allowed_cpus) {
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dev = get_cpu_device(cpu);
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if (!dev) {
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dev_warn(&cpufreq_device->cool_dev->device,
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"No cpu device for cpu %d\n", cpu);
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continue;
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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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break;
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else if (num_opps < 0)
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return num_opps;
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}
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if (num_opps == 0)
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return -EINVAL;
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power_table = kcalloc(num_opps, sizeof(*power_table), GFP_KERNEL);
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if (!power_table)
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return -ENOMEM;
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rcu_read_lock();
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for (freq = 0, i = 0;
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opp = dev_pm_opp_find_freq_ceil(dev, &freq), !IS_ERR(opp);
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freq++, i++) {
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u32 freq_mhz, voltage_mv;
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u64 power;
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if (i >= num_opps) {
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rcu_read_unlock();
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ret = -EAGAIN;
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goto free_power_table;
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}
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freq_mhz = freq / 1000000;
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voltage_mv = dev_pm_opp_get_voltage(opp) / 1000;
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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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/* frequency is stored in power_table in KHz */
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power_table[i].frequency = freq / 1000;
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/* power is stored in mW */
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power_table[i].power = power;
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}
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rcu_read_unlock();
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if (i != num_opps) {
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ret = PTR_ERR(opp);
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goto free_power_table;
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}
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cpufreq_device->cpu_dev = dev;
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cpufreq_device->dyn_power_table = power_table;
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cpufreq_device->dyn_power_table_entries = i;
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return 0;
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free_power_table:
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kfree(power_table);
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return ret;
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}
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static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_device,
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u32 freq)
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{
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int i;
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struct power_table *pt = cpufreq_device->dyn_power_table;
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for (i = 1; i < cpufreq_device->dyn_power_table_entries; i++)
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if (freq < pt[i].frequency)
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break;
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return pt[i - 1].power;
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}
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static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_device,
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u32 power)
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{
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int i;
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struct power_table *pt = cpufreq_device->dyn_power_table;
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for (i = 1; i < cpufreq_device->dyn_power_table_entries; i++)
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if (power < pt[i].power)
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break;
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return pt[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_device: &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 cpufreq_device->allowed_cpus
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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_device, 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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now_idle = get_cpu_idle_time(cpu, &now, 0);
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delta_idle = now_idle - cpufreq_device->time_in_idle[cpu_idx];
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delta_time = now - cpufreq_device->time_in_idle_timestamp[cpu_idx];
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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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cpufreq_device->time_in_idle[cpu_idx] = now_idle;
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cpufreq_device->time_in_idle_timestamp[cpu_idx] = now;
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return load;
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}
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/**
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* get_static_power() - calculate the static power consumed by the cpus
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* @cpufreq_device: struct &cpufreq_cooling_device for this cpu cdev
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* @tz: thermal zone device in which we're operating
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* @freq: frequency in KHz
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* @power: pointer in which to store the calculated static power
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*
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* Calculate the static power consumed by the cpus described by
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* @cpu_actor running at frequency @freq. This function relies on a
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* platform specific function that should have been provided when the
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* actor was registered. If it wasn't, the static power is assumed to
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* be negligible. The calculated static power is stored in @power.
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*
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* Return: 0 on success, -E* on failure.
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*/
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static int get_static_power(struct cpufreq_cooling_device *cpufreq_device,
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struct thermal_zone_device *tz, unsigned long freq,
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u32 *power)
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{
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struct dev_pm_opp *opp;
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unsigned long voltage;
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struct cpumask *cpumask = &cpufreq_device->allowed_cpus;
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unsigned long freq_hz = freq * 1000;
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if (!cpufreq_device->plat_get_static_power ||
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!cpufreq_device->cpu_dev) {
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*power = 0;
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return 0;
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}
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rcu_read_lock();
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opp = dev_pm_opp_find_freq_exact(cpufreq_device->cpu_dev, freq_hz,
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true);
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voltage = dev_pm_opp_get_voltage(opp);
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rcu_read_unlock();
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if (voltage == 0) {
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dev_warn_ratelimited(cpufreq_device->cpu_dev,
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"Failed to get voltage for frequency %lu: %ld\n",
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freq_hz, IS_ERR(opp) ? PTR_ERR(opp) : 0);
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return -EINVAL;
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}
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return cpufreq_device->plat_get_static_power(cpumask, tz->passive_delay,
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voltage, power);
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}
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/**
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* get_dynamic_power() - calculate the dynamic power
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* @cpufreq_device: &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_device.
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*/
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static u32 get_dynamic_power(struct cpufreq_cooling_device *cpufreq_device,
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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_device, freq);
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return (raw_cpu_power * cpufreq_device->last_load) / 100;
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}
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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_device = cdev->devdata;
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*state = cpufreq_device->max_level;
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return 0;
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}
|
|
|
|
/**
|
|
* cpufreq_get_cur_state - callback function to get the current cooling state.
|
|
* @cdev: thermal cooling device pointer.
|
|
* @state: fill this variable with the current cooling state.
|
|
*
|
|
* Callback for the thermal cooling device to return the cpufreq
|
|
* current cooling state.
|
|
*
|
|
* Return: 0 on success, an error code otherwise.
|
|
*/
|
|
static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
|
|
unsigned long *state)
|
|
{
|
|
struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
|
|
|
|
*state = cpufreq_device->cpufreq_state;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cpufreq_set_cur_state - callback function to set the current cooling state.
|
|
* @cdev: thermal cooling device pointer.
|
|
* @state: set this variable to the current cooling state.
|
|
*
|
|
* Callback for the thermal cooling device to change the cpufreq
|
|
* current cooling state.
|
|
*
|
|
* Return: 0 on success, an error code otherwise.
|
|
*/
|
|
static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
|
|
unsigned long state)
|
|
{
|
|
struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
|
|
unsigned int cpu = cpumask_any(&cpufreq_device->allowed_cpus);
|
|
unsigned int clip_freq;
|
|
|
|
/* Request state should be less than max_level */
|
|
if (WARN_ON(state > cpufreq_device->max_level))
|
|
return -EINVAL;
|
|
|
|
/* Check if the old cooling action is same as new cooling action */
|
|
if (cpufreq_device->cpufreq_state == state)
|
|
return 0;
|
|
|
|
clip_freq = cpufreq_device->freq_table[state];
|
|
cpufreq_device->cpufreq_state = state;
|
|
cpufreq_device->clipped_freq = clip_freq;
|
|
|
|
cpufreq_update_policy(cpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cpufreq_get_requested_power() - get the current power
|
|
* @cdev: &thermal_cooling_device pointer
|
|
* @tz: a valid thermal zone device pointer
|
|
* @power: pointer in which to store the resulting power
|
|
*
|
|
* Calculate the current power consumption of the cpus in milliwatts
|
|
* and store it in @power. This function should actually calculate
|
|
* the requested power, but it's hard to get the frequency that
|
|
* cpufreq would have assigned if there were no thermal limits.
|
|
* Instead, we calculate the current power on the assumption that the
|
|
* immediate future will look like the immediate past.
|
|
*
|
|
* We use the current frequency and the average load since this
|
|
* function was last called. In reality, there could have been
|
|
* multiple opps since this function was last called and that affects
|
|
* the load calculation. While it's not perfectly accurate, this
|
|
* simplification is good enough and works. REVISIT this, as more
|
|
* complex code may be needed if experiments show that it's not
|
|
* accurate enough.
|
|
*
|
|
* Return: 0 on success, -E* if getting the static power failed.
|
|
*/
|
|
static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev,
|
|
struct thermal_zone_device *tz,
|
|
u32 *power)
|
|
{
|
|
unsigned long freq;
|
|
int i = 0, cpu, ret;
|
|
u32 static_power, dynamic_power, total_load = 0;
|
|
struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
|
|
u32 *load_cpu = NULL;
|
|
|
|
cpu = cpumask_any_and(&cpufreq_device->allowed_cpus, cpu_online_mask);
|
|
|
|
/*
|
|
* All the CPUs are offline, thus the requested power by
|
|
* the cdev is 0
|
|
*/
|
|
if (cpu >= nr_cpu_ids) {
|
|
*power = 0;
|
|
return 0;
|
|
}
|
|
|
|
freq = cpufreq_quick_get(cpu);
|
|
|
|
if (trace_thermal_power_cpu_get_power_enabled()) {
|
|
u32 ncpus = cpumask_weight(&cpufreq_device->allowed_cpus);
|
|
|
|
load_cpu = kcalloc(ncpus, sizeof(*load_cpu), GFP_KERNEL);
|
|
}
|
|
|
|
for_each_cpu(cpu, &cpufreq_device->allowed_cpus) {
|
|
u32 load;
|
|
|
|
if (cpu_online(cpu))
|
|
load = get_load(cpufreq_device, cpu, i);
|
|
else
|
|
load = 0;
|
|
|
|
total_load += load;
|
|
if (trace_thermal_power_cpu_limit_enabled() && load_cpu)
|
|
load_cpu[i] = load;
|
|
|
|
i++;
|
|
}
|
|
|
|
cpufreq_device->last_load = total_load;
|
|
|
|
dynamic_power = get_dynamic_power(cpufreq_device, freq);
|
|
ret = get_static_power(cpufreq_device, tz, freq, &static_power);
|
|
if (ret) {
|
|
kfree(load_cpu);
|
|
return ret;
|
|
}
|
|
|
|
if (load_cpu) {
|
|
trace_thermal_power_cpu_get_power(
|
|
&cpufreq_device->allowed_cpus,
|
|
freq, load_cpu, i, dynamic_power, static_power);
|
|
|
|
kfree(load_cpu);
|
|
}
|
|
|
|
*power = static_power + dynamic_power;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cpufreq_state2power() - convert a cpu cdev state to power consumed
|
|
* @cdev: &thermal_cooling_device pointer
|
|
* @tz: a valid thermal zone device pointer
|
|
* @state: cooling device state to be converted
|
|
* @power: pointer in which to store the resulting power
|
|
*
|
|
* Convert cooling device state @state into power consumption in
|
|
* milliwatts assuming 100% load. Store the calculated power in
|
|
* @power.
|
|
*
|
|
* Return: 0 on success, -EINVAL if the cooling device state could not
|
|
* be converted into a frequency or other -E* if there was an error
|
|
* when calculating the static power.
|
|
*/
|
|
static int cpufreq_state2power(struct thermal_cooling_device *cdev,
|
|
struct thermal_zone_device *tz,
|
|
unsigned long state, u32 *power)
|
|
{
|
|
unsigned int freq, num_cpus;
|
|
cpumask_t cpumask;
|
|
u32 static_power, dynamic_power;
|
|
int ret;
|
|
struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
|
|
|
|
cpumask_and(&cpumask, &cpufreq_device->allowed_cpus, cpu_online_mask);
|
|
num_cpus = cpumask_weight(&cpumask);
|
|
|
|
/* None of our cpus are online, so no power */
|
|
if (num_cpus == 0) {
|
|
*power = 0;
|
|
return 0;
|
|
}
|
|
|
|
freq = cpufreq_device->freq_table[state];
|
|
if (!freq)
|
|
return -EINVAL;
|
|
|
|
dynamic_power = cpu_freq_to_power(cpufreq_device, freq) * num_cpus;
|
|
ret = get_static_power(cpufreq_device, tz, freq, &static_power);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*power = static_power + dynamic_power;
|
|
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 cpu, cur_freq, target_freq;
|
|
int ret;
|
|
s32 dyn_power;
|
|
u32 last_load, normalised_power, static_power;
|
|
struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
|
|
|
|
cpu = cpumask_any_and(&cpufreq_device->allowed_cpus, cpu_online_mask);
|
|
|
|
/* None of our cpus are online */
|
|
if (cpu >= nr_cpu_ids)
|
|
return -ENODEV;
|
|
|
|
cur_freq = cpufreq_quick_get(cpu);
|
|
ret = get_static_power(cpufreq_device, tz, cur_freq, &static_power);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dyn_power = power - static_power;
|
|
dyn_power = dyn_power > 0 ? dyn_power : 0;
|
|
last_load = cpufreq_device->last_load ?: 1;
|
|
normalised_power = (dyn_power * 100) / last_load;
|
|
target_freq = cpu_power_to_freq(cpufreq_device, normalised_power);
|
|
|
|
*state = cpufreq_cooling_get_level(cpu, target_freq);
|
|
if (*state == THERMAL_CSTATE_INVALID) {
|
|
dev_warn_ratelimited(&cdev->device,
|
|
"Failed to convert %dKHz for cpu %d into a cdev state\n",
|
|
target_freq, cpu);
|
|
return -EINVAL;
|
|
}
|
|
|
|
trace_thermal_power_cpu_limit(&cpufreq_device->allowed_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
|
|
* @clip_cpus: cpumask of cpus where the frequency constraints will happen.
|
|
* Normally this should be same as cpufreq policy->related_cpus.
|
|
* @capacitance: dynamic power coefficient for these cpus
|
|
* @plat_static_func: function to calculate the static power consumed by these
|
|
* cpus (optional)
|
|
*
|
|
* 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,
|
|
const struct cpumask *clip_cpus, u32 capacitance,
|
|
get_static_t plat_static_func)
|
|
{
|
|
struct cpufreq_policy *policy;
|
|
struct thermal_cooling_device *cool_dev;
|
|
struct cpufreq_cooling_device *cpufreq_dev;
|
|
char dev_name[THERMAL_NAME_LENGTH];
|
|
struct cpufreq_frequency_table *pos, *table;
|
|
struct cpumask temp_mask;
|
|
unsigned int freq, i, num_cpus;
|
|
int ret;
|
|
struct thermal_cooling_device_ops *cooling_ops;
|
|
|
|
cpumask_and(&temp_mask, clip_cpus, cpu_online_mask);
|
|
policy = cpufreq_cpu_get(cpumask_first(&temp_mask));
|
|
if (!policy) {
|
|
pr_debug("%s: CPUFreq policy not found\n", __func__);
|
|
return ERR_PTR(-EPROBE_DEFER);
|
|
}
|
|
|
|
table = policy->freq_table;
|
|
if (!table) {
|
|
pr_debug("%s: CPUFreq table not found\n", __func__);
|
|
cool_dev = ERR_PTR(-ENODEV);
|
|
goto put_policy;
|
|
}
|
|
|
|
cpufreq_dev = kzalloc(sizeof(*cpufreq_dev), GFP_KERNEL);
|
|
if (!cpufreq_dev) {
|
|
cool_dev = ERR_PTR(-ENOMEM);
|
|
goto put_policy;
|
|
}
|
|
|
|
num_cpus = cpumask_weight(clip_cpus);
|
|
cpufreq_dev->time_in_idle = kcalloc(num_cpus,
|
|
sizeof(*cpufreq_dev->time_in_idle),
|
|
GFP_KERNEL);
|
|
if (!cpufreq_dev->time_in_idle) {
|
|
cool_dev = ERR_PTR(-ENOMEM);
|
|
goto free_cdev;
|
|
}
|
|
|
|
cpufreq_dev->time_in_idle_timestamp =
|
|
kcalloc(num_cpus, sizeof(*cpufreq_dev->time_in_idle_timestamp),
|
|
GFP_KERNEL);
|
|
if (!cpufreq_dev->time_in_idle_timestamp) {
|
|
cool_dev = ERR_PTR(-ENOMEM);
|
|
goto free_time_in_idle;
|
|
}
|
|
|
|
/* Find max levels */
|
|
cpufreq_for_each_valid_entry(pos, table)
|
|
cpufreq_dev->max_level++;
|
|
|
|
cpufreq_dev->freq_table = kmalloc(sizeof(*cpufreq_dev->freq_table) *
|
|
cpufreq_dev->max_level, GFP_KERNEL);
|
|
if (!cpufreq_dev->freq_table) {
|
|
cool_dev = ERR_PTR(-ENOMEM);
|
|
goto free_time_in_idle_timestamp;
|
|
}
|
|
|
|
/* max_level is an index, not a counter */
|
|
cpufreq_dev->max_level--;
|
|
|
|
cpumask_copy(&cpufreq_dev->allowed_cpus, clip_cpus);
|
|
|
|
if (capacitance) {
|
|
cpufreq_dev->plat_get_static_power = plat_static_func;
|
|
|
|
ret = build_dyn_power_table(cpufreq_dev, capacitance);
|
|
if (ret) {
|
|
cool_dev = ERR_PTR(ret);
|
|
goto free_table;
|
|
}
|
|
|
|
cooling_ops = &cpufreq_power_cooling_ops;
|
|
} else {
|
|
cooling_ops = &cpufreq_cooling_ops;
|
|
}
|
|
|
|
ret = get_idr(&cpufreq_idr, &cpufreq_dev->id);
|
|
if (ret) {
|
|
cool_dev = ERR_PTR(ret);
|
|
goto free_power_table;
|
|
}
|
|
|
|
/* Fill freq-table in descending order of frequencies */
|
|
for (i = 0, freq = -1; i <= cpufreq_dev->max_level; i++) {
|
|
freq = find_next_max(table, freq);
|
|
cpufreq_dev->freq_table[i] = 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);
|
|
}
|
|
|
|
snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d",
|
|
cpufreq_dev->id);
|
|
|
|
cool_dev = thermal_of_cooling_device_register(np, dev_name, cpufreq_dev,
|
|
cooling_ops);
|
|
if (IS_ERR(cool_dev))
|
|
goto remove_idr;
|
|
|
|
cpufreq_dev->clipped_freq = cpufreq_dev->freq_table[0];
|
|
cpufreq_dev->cool_dev = cool_dev;
|
|
|
|
mutex_lock(&cooling_cpufreq_lock);
|
|
|
|
mutex_lock(&cooling_list_lock);
|
|
list_add(&cpufreq_dev->node, &cpufreq_dev_list);
|
|
mutex_unlock(&cooling_list_lock);
|
|
|
|
/* Register the notifier for first cpufreq cooling device */
|
|
if (!cpufreq_dev_count++)
|
|
cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
|
|
CPUFREQ_POLICY_NOTIFIER);
|
|
mutex_unlock(&cooling_cpufreq_lock);
|
|
|
|
goto put_policy;
|
|
|
|
remove_idr:
|
|
release_idr(&cpufreq_idr, cpufreq_dev->id);
|
|
free_power_table:
|
|
kfree(cpufreq_dev->dyn_power_table);
|
|
free_table:
|
|
kfree(cpufreq_dev->freq_table);
|
|
free_time_in_idle_timestamp:
|
|
kfree(cpufreq_dev->time_in_idle_timestamp);
|
|
free_time_in_idle:
|
|
kfree(cpufreq_dev->time_in_idle);
|
|
free_cdev:
|
|
kfree(cpufreq_dev);
|
|
put_policy:
|
|
cpufreq_cpu_put(policy);
|
|
|
|
return cool_dev;
|
|
}
|
|
|
|
/**
|
|
* cpufreq_cooling_register - function to create cpufreq cooling device.
|
|
* @clip_cpus: cpumask of cpus where the frequency constraints will happen.
|
|
*
|
|
* 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(const struct cpumask *clip_cpus)
|
|
{
|
|
return __cpufreq_cooling_register(NULL, clip_cpus, 0, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_cooling_register);
|
|
|
|
/**
|
|
* of_cpufreq_cooling_register - function to create cpufreq cooling device.
|
|
* @np: a valid struct device_node to the cooling device device tree node
|
|
* @clip_cpus: cpumask of cpus where the frequency constraints will happen.
|
|
*
|
|
* 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.
|
|
*
|
|
* Return: a valid struct thermal_cooling_device pointer on success,
|
|
* on failure, it returns a corresponding ERR_PTR().
|
|
*/
|
|
struct thermal_cooling_device *
|
|
of_cpufreq_cooling_register(struct device_node *np,
|
|
const struct cpumask *clip_cpus)
|
|
{
|
|
if (!np)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
return __cpufreq_cooling_register(np, clip_cpus, 0, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register);
|
|
|
|
/**
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* cpufreq_power_cooling_register() - create cpufreq cooling device with power extensions
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* @clip_cpus: cpumask of cpus where the frequency constraints will happen
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* @capacitance: dynamic power coefficient for these cpus
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* @plat_static_func: function to calculate the static power consumed by these
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* cpus (optional)
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*
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* This interface function registers the cpufreq cooling device with
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* the name "thermal-cpufreq-%x". This api can support multiple
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* instances of cpufreq cooling devices. Using this function, the
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* cooling device will implement the power extensions by using a
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* simple cpu power model. The cpus must have registered their OPPs
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* using the OPP library.
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*
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* An optional @plat_static_func may be provided to calculate the
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* static power consumed by these cpus. If the platform's static
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* power consumption is unknown or negligible, make it NULL.
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*
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* Return: a valid struct thermal_cooling_device pointer on success,
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* on failure, it returns a corresponding ERR_PTR().
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*/
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struct thermal_cooling_device *
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cpufreq_power_cooling_register(const struct cpumask *clip_cpus, u32 capacitance,
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get_static_t plat_static_func)
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{
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return __cpufreq_cooling_register(NULL, clip_cpus, capacitance,
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plat_static_func);
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}
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EXPORT_SYMBOL(cpufreq_power_cooling_register);
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/**
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* of_cpufreq_power_cooling_register() - create cpufreq cooling device with power extensions
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* @np: a valid struct device_node to the cooling device device tree node
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* @clip_cpus: cpumask of cpus where the frequency constraints will happen
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* @capacitance: dynamic power coefficient for these cpus
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* @plat_static_func: function to calculate the static power consumed by these
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* cpus (optional)
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*
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* This interface function registers the cpufreq cooling device with
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* the name "thermal-cpufreq-%x". This api can support multiple
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* instances of cpufreq cooling devices. Using this API, the cpufreq
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* cooling device will be linked to the device tree node provided.
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* Using this function, the cooling device will implement the power
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* extensions by using a simple cpu power model. The cpus must have
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* registered their OPPs using the OPP library.
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*
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* An optional @plat_static_func may be provided to calculate the
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* static power consumed by these cpus. If the platform's static
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* power consumption is unknown or negligible, make it NULL.
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*
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* Return: a valid struct thermal_cooling_device pointer on success,
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* on failure, it returns a corresponding ERR_PTR().
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*/
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struct thermal_cooling_device *
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of_cpufreq_power_cooling_register(struct device_node *np,
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const struct cpumask *clip_cpus,
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u32 capacitance,
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get_static_t plat_static_func)
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{
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if (!np)
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return ERR_PTR(-EINVAL);
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return __cpufreq_cooling_register(np, clip_cpus, capacitance,
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plat_static_func);
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}
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EXPORT_SYMBOL(of_cpufreq_power_cooling_register);
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/**
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* cpufreq_cooling_unregister - function to remove cpufreq cooling device.
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* @cdev: thermal cooling device pointer.
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*
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* This interface function unregisters the "thermal-cpufreq-%x" cooling device.
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*/
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void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
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{
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struct cpufreq_cooling_device *cpufreq_dev;
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if (!cdev)
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return;
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cpufreq_dev = cdev->devdata;
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/* Unregister the notifier for the last cpufreq cooling device */
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mutex_lock(&cooling_cpufreq_lock);
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if (!--cpufreq_dev_count)
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cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
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CPUFREQ_POLICY_NOTIFIER);
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mutex_lock(&cooling_list_lock);
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list_del(&cpufreq_dev->node);
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mutex_unlock(&cooling_list_lock);
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mutex_unlock(&cooling_cpufreq_lock);
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thermal_cooling_device_unregister(cpufreq_dev->cool_dev);
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release_idr(&cpufreq_idr, cpufreq_dev->id);
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kfree(cpufreq_dev->dyn_power_table);
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kfree(cpufreq_dev->time_in_idle_timestamp);
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kfree(cpufreq_dev->time_in_idle);
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kfree(cpufreq_dev->freq_table);
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kfree(cpufreq_dev);
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}
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EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister);
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