![Eduardo Valentin](/assets/img/avatar_default.png)
There are predefined cpu_masks that are const data structures. This patch changes the cpu cooling register function so that those const cpu_masks can be used, without compilation warnings. include/linux/cpumask.h * The following particular system cpumasks and operations manage * possible, present, active and online cpus. * * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable * cpu_present_mask - has bit 'cpu' set iff cpu is populated * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler * cpu_active_mask - has bit 'cpu' set iff cpu available to migration * Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
399 lines
11 KiB
C
399 lines
11 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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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/kernel.h>
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#include <linux/module.h>
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#include <linux/thermal.h>
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#include <linux/platform_device.h>
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#include <linux/cpufreq.h>
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#include <linux/err.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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/**
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* struct cpufreq_cooling_device
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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 the
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* egistered 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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* @cpufreq_val: integer value representing the absolute value of the clipped
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* frequency.
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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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*
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* This structure is required for keeping information of each
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* cpufreq_cooling_device registered as a list whose head is represented by
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* cooling_cpufreq_list. In order to prevent corruption of this list a
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* mutex lock cooling_cpufreq_lock is used.
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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 cpufreq_val;
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struct cpumask allowed_cpus;
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struct list_head node;
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};
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static LIST_HEAD(cooling_cpufreq_list);
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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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/* notify_table passes value to the CPUFREQ_ADJUST callback function. */
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#define NOTIFY_INVALID NULL
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static struct cpufreq_cooling_device *notify_device;
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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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static int get_idr(struct idr *idr, int *id)
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{
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int err;
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again:
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if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
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return -ENOMEM;
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mutex_lock(&cooling_cpufreq_lock);
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err = idr_get_new(idr, NULL, id);
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mutex_unlock(&cooling_cpufreq_lock);
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if (unlikely(err == -EAGAIN))
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goto again;
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else if (unlikely(err))
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return err;
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*id = *id & MAX_IDR_MASK;
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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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* is_cpufreq_valid - function to check if a cpu has frequency transition policy.
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* @cpu: cpu for which check is needed.
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*/
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static int is_cpufreq_valid(int cpu)
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{
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struct cpufreq_policy policy;
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return !cpufreq_get_policy(&policy, cpu);
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}
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/**
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* get_cpu_frequency - get the absolute value of frequency from level.
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* @cpu: cpu for which frequency is fetched.
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* @level: level of frequency of the CPU
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* e.g level=1 --> 1st MAX FREQ, LEVEL=2 ---> 2nd MAX FREQ, .... etc
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*/
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static unsigned int get_cpu_frequency(unsigned int cpu, unsigned long level)
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{
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int ret = 0, i = 0;
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unsigned long level_index;
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bool descend = false;
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struct cpufreq_frequency_table *table =
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cpufreq_frequency_get_table(cpu);
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if (!table)
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return ret;
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while (table[i].frequency != CPUFREQ_TABLE_END) {
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if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
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continue;
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/*check if table in ascending or descending order*/
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if ((table[i + 1].frequency != CPUFREQ_TABLE_END) &&
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(table[i + 1].frequency < table[i].frequency)
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&& !descend) {
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descend = true;
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}
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/*return if level matched and table in descending order*/
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if (descend && i == level)
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return table[i].frequency;
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i++;
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}
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i--;
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if (level > i || descend)
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return ret;
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level_index = i - level;
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/*Scan the table in reverse order and match the level*/
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while (i >= 0) {
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if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
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continue;
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/*return if level matched*/
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if (i == level_index)
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return table[i].frequency;
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i--;
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}
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return ret;
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}
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/**
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* cpufreq_apply_cooling - function to apply frequency clipping.
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* @cpufreq_device: cpufreq_cooling_device pointer containing frequency
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* clipping data.
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* @cooling_state: value of the cooling state.
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*/
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static int cpufreq_apply_cooling(struct cpufreq_cooling_device *cpufreq_device,
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unsigned long cooling_state)
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{
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unsigned int cpuid, clip_freq;
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struct cpumask *maskPtr = &cpufreq_device->allowed_cpus;
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unsigned int cpu = cpumask_any(maskPtr);
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/* Check if the old cooling action is same as new cooling action */
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if (cpufreq_device->cpufreq_state == cooling_state)
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return 0;
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clip_freq = get_cpu_frequency(cpu, cooling_state);
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if (!clip_freq)
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return -EINVAL;
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cpufreq_device->cpufreq_state = cooling_state;
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cpufreq_device->cpufreq_val = clip_freq;
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notify_device = cpufreq_device;
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for_each_cpu(cpuid, maskPtr) {
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if (is_cpufreq_valid(cpuid))
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cpufreq_update_policy(cpuid);
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}
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notify_device = NOTIFY_INVALID;
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return 0;
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}
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/**
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* cpufreq_thermal_notifier - notifier callback for cpufreq policy change.
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* @nb: struct notifier_block * with callback info.
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* @event: value showing cpufreq event for which this function invoked.
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* @data: callback-specific data
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*/
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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 max_freq = 0;
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if (event != CPUFREQ_ADJUST || notify_device == NOTIFY_INVALID)
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return 0;
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if (cpumask_test_cpu(policy->cpu, ¬ify_device->allowed_cpus))
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max_freq = notify_device->cpufreq_val;
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/* Never exceed user_policy.max*/
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if (max_freq > policy->user_policy.max)
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max_freq = policy->user_policy.max;
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if (policy->max != max_freq)
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cpufreq_verify_within_limits(policy, 0, max_freq);
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return 0;
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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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/**
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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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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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struct cpumask *maskPtr = &cpufreq_device->allowed_cpus;
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unsigned int cpu;
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struct cpufreq_frequency_table *table;
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unsigned long count = 0;
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int i = 0;
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cpu = cpumask_any(maskPtr);
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table = cpufreq_frequency_get_table(cpu);
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if (!table) {
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*state = 0;
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return 0;
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}
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for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
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if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
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continue;
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count++;
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}
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if (count > 0) {
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*state = --count;
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return 0;
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}
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return -EINVAL;
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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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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_device = cdev->devdata;
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*state = cpufreq_device->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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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_device = cdev->devdata;
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return cpufreq_apply_cooling(cpufreq_device, state);
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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 const 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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/* Notifier for cpufreq policy change */
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static struct notifier_block thermal_cpufreq_notifier_block = {
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.notifier_call = cpufreq_thermal_notifier,
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};
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/**
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* cpufreq_cooling_register - function to create cpufreq cooling device.
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* @clip_cpus: cpumask of cpus where the frequency constraints will happen.
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*/
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struct thermal_cooling_device *cpufreq_cooling_register(
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const struct cpumask *clip_cpus)
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{
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struct thermal_cooling_device *cool_dev;
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struct cpufreq_cooling_device *cpufreq_dev = NULL;
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unsigned int min = 0, max = 0;
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char dev_name[THERMAL_NAME_LENGTH];
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int ret = 0, i;
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struct cpufreq_policy policy;
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/*Verify that all the clip cpus have same freq_min, freq_max limit*/
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for_each_cpu(i, clip_cpus) {
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/*continue if cpufreq policy not found and not return error*/
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if (!cpufreq_get_policy(&policy, i))
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continue;
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if (min == 0 && max == 0) {
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min = policy.cpuinfo.min_freq;
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max = policy.cpuinfo.max_freq;
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} else {
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if (min != policy.cpuinfo.min_freq ||
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max != policy.cpuinfo.max_freq)
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return ERR_PTR(-EINVAL);
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}
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}
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cpufreq_dev = kzalloc(sizeof(struct cpufreq_cooling_device),
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GFP_KERNEL);
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if (!cpufreq_dev)
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return ERR_PTR(-ENOMEM);
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cpumask_copy(&cpufreq_dev->allowed_cpus, clip_cpus);
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ret = get_idr(&cpufreq_idr, &cpufreq_dev->id);
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if (ret) {
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kfree(cpufreq_dev);
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return ERR_PTR(-EINVAL);
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}
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sprintf(dev_name, "thermal-cpufreq-%d", cpufreq_dev->id);
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cool_dev = thermal_cooling_device_register(dev_name, cpufreq_dev,
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&cpufreq_cooling_ops);
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if (!cool_dev) {
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release_idr(&cpufreq_idr, cpufreq_dev->id);
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kfree(cpufreq_dev);
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return ERR_PTR(-EINVAL);
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}
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cpufreq_dev->cool_dev = cool_dev;
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cpufreq_dev->cpufreq_state = 0;
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mutex_lock(&cooling_cpufreq_lock);
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/* Register the notifier for first cpufreq cooling device */
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if (cpufreq_dev_count == 0)
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cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
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CPUFREQ_POLICY_NOTIFIER);
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cpufreq_dev_count++;
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mutex_unlock(&cooling_cpufreq_lock);
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return cool_dev;
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}
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EXPORT_SYMBOL(cpufreq_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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void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
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{
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struct cpufreq_cooling_device *cpufreq_dev = cdev->devdata;
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mutex_lock(&cooling_cpufreq_lock);
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cpufreq_dev_count--;
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/* Unregister the notifier for the last cpufreq cooling device */
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if (cpufreq_dev_count == 0) {
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cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
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CPUFREQ_POLICY_NOTIFIER);
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}
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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);
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}
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EXPORT_SYMBOL(cpufreq_cooling_unregister);
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