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5168b1be09
Thermal pressure provides a new API, which allows to use CPU frequency as an argument. That removes the need of local conversion to capacity. Use this new function and remove old conversion code. Signed-off-by: Lukasz Luba <lukasz.luba@arm.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
693 lines
19 KiB
C
693 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/drivers/thermal/cpufreq_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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*
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* Copyright (C) 2012-2018 Linaro Limited.
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*
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* Authors: Amit Daniel <amit.kachhap@linaro.org>
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* Viresh Kumar <viresh.kumar@linaro.org>
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*
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*/
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#include <linux/cpu.h>
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#include <linux/cpufreq.h>
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#include <linux/cpu_cooling.h>
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#include <linux/device.h>
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#include <linux/energy_model.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/pm_opp.h>
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#include <linux/pm_qos.h>
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#include <linux/slab.h>
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#include <linux/thermal.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 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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* @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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* @max_level: maximum cooling level. One less than total number of valid
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* cpufreq frequencies.
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* @em: Reference on the Energy Model of the device
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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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* @idle_time: idle time stats
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* @qos_req: PM QoS contraint to apply
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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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u32 last_load;
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unsigned int cpufreq_state;
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unsigned int max_level;
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struct em_perf_domain *em;
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struct cpufreq_policy *policy;
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#ifndef CONFIG_SMP
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struct time_in_idle *idle_time;
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#endif
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struct freq_qos_request qos_req;
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};
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#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
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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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int i;
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for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) {
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if (freq > cpufreq_cdev->em->table[i].frequency)
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break;
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}
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return cpufreq_cdev->max_level - i - 1;
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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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for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) {
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if (freq > cpufreq_cdev->em->table[i].frequency)
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break;
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}
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return cpufreq_cdev->em->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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for (i = cpufreq_cdev->max_level; i > 0; i--) {
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if (power >= cpufreq_cdev->em->table[i].power)
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break;
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}
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return cpufreq_cdev->em->table[i].frequency;
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}
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/**
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* get_load() - get load for a cpu
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* @cpufreq_cdev: struct cpufreq_cooling_device for the cpu
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* @cpu: cpu number
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* @cpu_idx: index of the cpu in time_in_idle array
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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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#ifdef CONFIG_SMP
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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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unsigned long max = arch_scale_cpu_capacity(cpu);
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unsigned long util;
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util = sched_cpu_util(cpu, max);
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return (util * 100) / max;
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}
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#else /* !CONFIG_SMP */
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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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#endif /* CONFIG_SMP */
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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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/**
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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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* @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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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 (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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* @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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unsigned long state, u32 *power)
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{
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unsigned int freq, num_cpus, idx;
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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 (state > cpufreq_cdev->max_level)
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return -EINVAL;
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num_cpus = cpumask_weight(cpufreq_cdev->policy->cpus);
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idx = cpufreq_cdev->max_level - state;
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freq = cpufreq_cdev->em->table[idx].frequency;
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*power = cpu_freq_to_power(cpufreq_cdev, freq) * num_cpus;
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return 0;
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}
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/**
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* cpufreq_power2state() - convert power to a cooling device state
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* @cdev: &thermal_cooling_device pointer
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* @power: power in milliwatts to be converted
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* @state: pointer in which to store the resulting state
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*
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* Calculate a cooling device state for the cpus described by @cdev
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* that would allow them to consume at most @power mW and store it in
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* @state. Note that this calculation depends on external factors
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* such as the cpu load or the current static power. Calling this
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* function with the same power as input can yield different cooling
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* device states depending on those external factors.
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*
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* Return: 0 on success, -ENODEV if no cpus are online or -EINVAL if
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* the calculated frequency could not be converted to a valid state.
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* The latter should not happen unless the frequencies available to
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* cpufreq have changed since the initialization of the cpu cooling
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* device.
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*/
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static int cpufreq_power2state(struct thermal_cooling_device *cdev,
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u32 power, unsigned long *state)
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{
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unsigned int target_freq;
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u32 last_load, normalised_power;
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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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last_load = cpufreq_cdev->last_load ?: 1;
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normalised_power = (power * 100) / last_load;
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target_freq = cpu_power_to_freq(cpufreq_cdev, normalised_power);
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*state = get_level(cpufreq_cdev, target_freq);
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trace_thermal_power_cpu_limit(policy->related_cpus, target_freq, *state,
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power);
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return 0;
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}
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static inline bool em_is_sane(struct cpufreq_cooling_device *cpufreq_cdev,
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struct em_perf_domain *em) {
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struct cpufreq_policy *policy;
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unsigned int nr_levels;
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if (!em)
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return false;
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policy = cpufreq_cdev->policy;
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if (!cpumask_equal(policy->related_cpus, em_span_cpus(em))) {
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pr_err("The span of pd %*pbl is misaligned with cpufreq policy %*pbl\n",
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cpumask_pr_args(em_span_cpus(em)),
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cpumask_pr_args(policy->related_cpus));
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return false;
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}
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nr_levels = cpufreq_cdev->max_level + 1;
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if (em_pd_nr_perf_states(em) != nr_levels) {
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pr_err("The number of performance states in pd %*pbl (%u) doesn't match the number of cooling levels (%u)\n",
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cpumask_pr_args(em_span_cpus(em)),
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em_pd_nr_perf_states(em), nr_levels);
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return false;
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}
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return true;
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}
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#endif /* CONFIG_THERMAL_GOV_POWER_ALLOCATOR */
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#ifdef CONFIG_SMP
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static inline int allocate_idle_time(struct cpufreq_cooling_device *cpufreq_cdev)
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{
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return 0;
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}
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static inline void free_idle_time(struct cpufreq_cooling_device *cpufreq_cdev)
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{
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}
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#else
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static int allocate_idle_time(struct cpufreq_cooling_device *cpufreq_cdev)
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{
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unsigned int num_cpus = cpumask_weight(cpufreq_cdev->policy->related_cpus);
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cpufreq_cdev->idle_time = kcalloc(num_cpus,
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sizeof(*cpufreq_cdev->idle_time),
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GFP_KERNEL);
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if (!cpufreq_cdev->idle_time)
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return -ENOMEM;
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return 0;
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}
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static void free_idle_time(struct cpufreq_cooling_device *cpufreq_cdev)
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{
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kfree(cpufreq_cdev->idle_time);
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cpufreq_cdev->idle_time = NULL;
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}
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#endif /* CONFIG_SMP */
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static unsigned int get_state_freq(struct cpufreq_cooling_device *cpufreq_cdev,
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unsigned long state)
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{
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struct cpufreq_policy *policy;
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unsigned long idx;
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#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
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/* Use the Energy Model table if available */
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if (cpufreq_cdev->em) {
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idx = cpufreq_cdev->max_level - state;
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return cpufreq_cdev->em->table[idx].frequency;
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}
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#endif
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/* Otherwise, fallback on the CPUFreq table */
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policy = cpufreq_cdev->policy;
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if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
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idx = cpufreq_cdev->max_level - state;
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else
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idx = state;
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return policy->freq_table[idx].frequency;
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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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struct cpumask *cpus;
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unsigned int frequency;
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int ret;
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/* Request state should be less than max_level */
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if (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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frequency = get_state_freq(cpufreq_cdev, state);
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ret = freq_qos_update_request(&cpufreq_cdev->qos_req, frequency);
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if (ret >= 0) {
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cpufreq_cdev->cpufreq_state = state;
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cpus = cpufreq_cdev->policy->related_cpus;
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arch_update_thermal_pressure(cpus, frequency);
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ret = 0;
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}
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return ret;
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}
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/* Bind cpufreq callbacks to thermal cooling device ops */
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static struct thermal_cooling_device_ops cpufreq_cooling_ops = {
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.get_max_state = cpufreq_get_max_state,
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.get_cur_state = cpufreq_get_cur_state,
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.set_cur_state = cpufreq_set_cur_state,
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};
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|
|
|
/**
|
|
* __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.
|
|
* @em: Energy Model of the 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. 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,
|
|
struct em_perf_domain *em)
|
|
{
|
|
struct thermal_cooling_device *cdev;
|
|
struct cpufreq_cooling_device *cpufreq_cdev;
|
|
unsigned int i;
|
|
struct device *dev;
|
|
int ret;
|
|
struct thermal_cooling_device_ops *cooling_ops;
|
|
char *name;
|
|
|
|
dev = get_cpu_device(policy->cpu);
|
|
if (unlikely(!dev)) {
|
|
pr_warn("No cpu device for cpu %d\n", policy->cpu);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
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;
|
|
|
|
ret = allocate_idle_time(cpufreq_cdev);
|
|
if (ret) {
|
|
cdev = ERR_PTR(ret);
|
|
goto free_cdev;
|
|
}
|
|
|
|
/* max_level is an index, not a counter */
|
|
cpufreq_cdev->max_level = i - 1;
|
|
|
|
cooling_ops = &cpufreq_cooling_ops;
|
|
|
|
#ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR
|
|
if (em_is_sane(cpufreq_cdev, em)) {
|
|
cpufreq_cdev->em = em;
|
|
cooling_ops->get_requested_power = cpufreq_get_requested_power;
|
|
cooling_ops->state2power = cpufreq_state2power;
|
|
cooling_ops->power2state = cpufreq_power2state;
|
|
} else
|
|
#endif
|
|
if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED) {
|
|
pr_err("%s: unsorted frequency tables are not supported\n",
|
|
__func__);
|
|
cdev = ERR_PTR(-EINVAL);
|
|
goto free_idle_time;
|
|
}
|
|
|
|
ret = freq_qos_add_request(&policy->constraints,
|
|
&cpufreq_cdev->qos_req, FREQ_QOS_MAX,
|
|
get_state_freq(cpufreq_cdev, 0));
|
|
if (ret < 0) {
|
|
pr_err("%s: Failed to add freq constraint (%d)\n", __func__,
|
|
ret);
|
|
cdev = ERR_PTR(ret);
|
|
goto free_idle_time;
|
|
}
|
|
|
|
cdev = ERR_PTR(-ENOMEM);
|
|
name = kasprintf(GFP_KERNEL, "cpufreq-%s", dev_name(dev));
|
|
if (!name)
|
|
goto remove_qos_req;
|
|
|
|
cdev = thermal_of_cooling_device_register(np, name, cpufreq_cdev,
|
|
cooling_ops);
|
|
kfree(name);
|
|
|
|
if (IS_ERR(cdev))
|
|
goto remove_qos_req;
|
|
|
|
return cdev;
|
|
|
|
remove_qos_req:
|
|
freq_qos_remove_request(&cpufreq_cdev->qos_req);
|
|
free_idle_time:
|
|
free_idle_time(cpufreq_cdev);
|
|
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, NULL);
|
|
}
|
|
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;
|
|
|
|
if (!np) {
|
|
pr_err("cpufreq_cooling: OF node not available for cpu%d\n",
|
|
policy->cpu);
|
|
return NULL;
|
|
}
|
|
|
|
if (of_find_property(np, "#cooling-cells", NULL)) {
|
|
struct em_perf_domain *em = em_cpu_get(policy->cpu);
|
|
|
|
cdev = __cpufreq_cooling_register(np, policy, em);
|
|
if (IS_ERR(cdev)) {
|
|
pr_err("cpufreq_cooling: cpu%d failed to register 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;
|
|
|
|
if (!cdev)
|
|
return;
|
|
|
|
cpufreq_cdev = cdev->devdata;
|
|
|
|
thermal_cooling_device_unregister(cdev);
|
|
freq_qos_remove_request(&cpufreq_cdev->qos_req);
|
|
free_idle_time(cpufreq_cdev);
|
|
kfree(cpufreq_cdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister);
|