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![Tzung-Bi Shih](/assets/img/avatar_default.png)
Suppose devfreq_update_status() failure in devfreq_set_target() is not a critical error, reduces the log severity. Signed-off-by: Tzung-Bi Shih <tzungbi@google.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2249 lines
56 KiB
C
2249 lines
56 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* devfreq: Generic Dynamic Voltage and Frequency Scaling (DVFS) Framework
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* for Non-CPU Devices.
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*
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* Copyright (C) 2011 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@samsung.com>
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*/
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#include <linux/kernel.h>
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#include <linux/kmod.h>
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#include <linux/sched.h>
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#include <linux/debugfs.h>
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#include <linux/devfreq_cooling.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/pm_opp.h>
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#include <linux/devfreq.h>
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#include <linux/workqueue.h>
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#include <linux/platform_device.h>
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#include <linux/list.h>
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#include <linux/printk.h>
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#include <linux/hrtimer.h>
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#include <linux/of.h>
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#include <linux/pm_qos.h>
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#include <linux/units.h>
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#include "governor.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/devfreq.h>
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#define IS_SUPPORTED_FLAG(f, name) ((f & DEVFREQ_GOV_FLAG_##name) ? true : false)
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#define IS_SUPPORTED_ATTR(f, name) ((f & DEVFREQ_GOV_ATTR_##name) ? true : false)
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static struct class *devfreq_class;
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static struct dentry *devfreq_debugfs;
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/*
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* devfreq core provides delayed work based load monitoring helper
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* functions. Governors can use these or can implement their own
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* monitoring mechanism.
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*/
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static struct workqueue_struct *devfreq_wq;
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/* The list of all device-devfreq governors */
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static LIST_HEAD(devfreq_governor_list);
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/* The list of all device-devfreq */
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static LIST_HEAD(devfreq_list);
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static DEFINE_MUTEX(devfreq_list_lock);
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static const char timer_name[][DEVFREQ_NAME_LEN] = {
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[DEVFREQ_TIMER_DEFERRABLE] = { "deferrable" },
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[DEVFREQ_TIMER_DELAYED] = { "delayed" },
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};
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/**
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* find_device_devfreq() - find devfreq struct using device pointer
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* @dev: device pointer used to lookup device devfreq.
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*
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* Search the list of device devfreqs and return the matched device's
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* devfreq info. devfreq_list_lock should be held by the caller.
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*/
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static struct devfreq *find_device_devfreq(struct device *dev)
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{
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struct devfreq *tmp_devfreq;
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lockdep_assert_held(&devfreq_list_lock);
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if (IS_ERR_OR_NULL(dev)) {
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pr_err("DEVFREQ: %s: Invalid parameters\n", __func__);
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return ERR_PTR(-EINVAL);
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}
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list_for_each_entry(tmp_devfreq, &devfreq_list, node) {
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if (tmp_devfreq->dev.parent == dev)
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return tmp_devfreq;
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}
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return ERR_PTR(-ENODEV);
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}
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static unsigned long find_available_min_freq(struct devfreq *devfreq)
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{
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struct dev_pm_opp *opp;
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unsigned long min_freq = 0;
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opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq);
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if (IS_ERR(opp))
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min_freq = 0;
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else
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dev_pm_opp_put(opp);
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return min_freq;
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}
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static unsigned long find_available_max_freq(struct devfreq *devfreq)
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{
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struct dev_pm_opp *opp;
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unsigned long max_freq = ULONG_MAX;
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opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq);
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if (IS_ERR(opp))
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max_freq = 0;
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else
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dev_pm_opp_put(opp);
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return max_freq;
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}
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/**
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* get_freq_range() - Get the current freq range
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* @devfreq: the devfreq instance
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* @min_freq: the min frequency
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* @max_freq: the max frequency
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*
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* This takes into consideration all constraints.
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*/
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static void get_freq_range(struct devfreq *devfreq,
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unsigned long *min_freq,
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unsigned long *max_freq)
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{
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unsigned long *freq_table = devfreq->profile->freq_table;
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s32 qos_min_freq, qos_max_freq;
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lockdep_assert_held(&devfreq->lock);
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/*
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* Initialize minimum/maximum frequency from freq table.
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* The devfreq drivers can initialize this in either ascending or
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* descending order and devfreq core supports both.
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*/
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if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) {
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*min_freq = freq_table[0];
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*max_freq = freq_table[devfreq->profile->max_state - 1];
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} else {
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*min_freq = freq_table[devfreq->profile->max_state - 1];
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*max_freq = freq_table[0];
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}
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/* Apply constraints from PM QoS */
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qos_min_freq = dev_pm_qos_read_value(devfreq->dev.parent,
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DEV_PM_QOS_MIN_FREQUENCY);
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qos_max_freq = dev_pm_qos_read_value(devfreq->dev.parent,
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DEV_PM_QOS_MAX_FREQUENCY);
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*min_freq = max(*min_freq, (unsigned long)HZ_PER_KHZ * qos_min_freq);
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if (qos_max_freq != PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE)
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*max_freq = min(*max_freq,
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(unsigned long)HZ_PER_KHZ * qos_max_freq);
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/* Apply constraints from OPP interface */
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*min_freq = max(*min_freq, devfreq->scaling_min_freq);
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*max_freq = min(*max_freq, devfreq->scaling_max_freq);
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if (*min_freq > *max_freq)
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*min_freq = *max_freq;
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}
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/**
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* devfreq_get_freq_level() - Lookup freq_table for the frequency
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* @devfreq: the devfreq instance
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* @freq: the target frequency
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*/
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static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq)
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{
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int lev;
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for (lev = 0; lev < devfreq->profile->max_state; lev++)
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if (freq == devfreq->profile->freq_table[lev])
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return lev;
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return -EINVAL;
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}
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static int set_freq_table(struct devfreq *devfreq)
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{
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struct devfreq_dev_profile *profile = devfreq->profile;
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struct dev_pm_opp *opp;
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unsigned long freq;
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int i, count;
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/* Initialize the freq_table from OPP table */
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count = dev_pm_opp_get_opp_count(devfreq->dev.parent);
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if (count <= 0)
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return -EINVAL;
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profile->max_state = count;
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profile->freq_table = devm_kcalloc(devfreq->dev.parent,
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profile->max_state,
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sizeof(*profile->freq_table),
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GFP_KERNEL);
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if (!profile->freq_table) {
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profile->max_state = 0;
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return -ENOMEM;
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}
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for (i = 0, freq = 0; i < profile->max_state; i++, freq++) {
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opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq);
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if (IS_ERR(opp)) {
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devm_kfree(devfreq->dev.parent, profile->freq_table);
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profile->max_state = 0;
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return PTR_ERR(opp);
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}
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dev_pm_opp_put(opp);
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profile->freq_table[i] = freq;
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}
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return 0;
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}
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/**
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* devfreq_update_status() - Update statistics of devfreq behavior
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* @devfreq: the devfreq instance
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* @freq: the update target frequency
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*/
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int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
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{
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int lev, prev_lev, ret = 0;
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u64 cur_time;
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lockdep_assert_held(&devfreq->lock);
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cur_time = get_jiffies_64();
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/* Immediately exit if previous_freq is not initialized yet. */
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if (!devfreq->previous_freq)
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goto out;
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prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq);
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if (prev_lev < 0) {
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ret = prev_lev;
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goto out;
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}
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devfreq->stats.time_in_state[prev_lev] +=
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cur_time - devfreq->stats.last_update;
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lev = devfreq_get_freq_level(devfreq, freq);
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if (lev < 0) {
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ret = lev;
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goto out;
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}
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if (lev != prev_lev) {
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devfreq->stats.trans_table[
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(prev_lev * devfreq->profile->max_state) + lev]++;
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devfreq->stats.total_trans++;
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}
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out:
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devfreq->stats.last_update = cur_time;
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return ret;
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}
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EXPORT_SYMBOL(devfreq_update_status);
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/**
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* find_devfreq_governor() - find devfreq governor from name
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* @name: name of the governor
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*
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* Search the list of devfreq governors and return the matched
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* governor's pointer. devfreq_list_lock should be held by the caller.
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*/
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static struct devfreq_governor *find_devfreq_governor(const char *name)
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{
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struct devfreq_governor *tmp_governor;
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lockdep_assert_held(&devfreq_list_lock);
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if (IS_ERR_OR_NULL(name)) {
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pr_err("DEVFREQ: %s: Invalid parameters\n", __func__);
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return ERR_PTR(-EINVAL);
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}
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list_for_each_entry(tmp_governor, &devfreq_governor_list, node) {
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if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN))
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return tmp_governor;
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}
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return ERR_PTR(-ENODEV);
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}
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/**
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* try_then_request_governor() - Try to find the governor and request the
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* module if is not found.
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* @name: name of the governor
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*
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* Search the list of devfreq governors and request the module and try again
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* if is not found. This can happen when both drivers (the governor driver
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* and the driver that call devfreq_add_device) are built as modules.
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* devfreq_list_lock should be held by the caller. Returns the matched
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* governor's pointer or an error pointer.
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*/
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static struct devfreq_governor *try_then_request_governor(const char *name)
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{
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struct devfreq_governor *governor;
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int err = 0;
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lockdep_assert_held(&devfreq_list_lock);
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if (IS_ERR_OR_NULL(name)) {
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pr_err("DEVFREQ: %s: Invalid parameters\n", __func__);
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return ERR_PTR(-EINVAL);
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}
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governor = find_devfreq_governor(name);
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if (IS_ERR(governor)) {
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mutex_unlock(&devfreq_list_lock);
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if (!strncmp(name, DEVFREQ_GOV_SIMPLE_ONDEMAND,
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DEVFREQ_NAME_LEN))
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err = request_module("governor_%s", "simpleondemand");
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else
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err = request_module("governor_%s", name);
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/* Restore previous state before return */
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mutex_lock(&devfreq_list_lock);
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if (err)
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return (err < 0) ? ERR_PTR(err) : ERR_PTR(-EINVAL);
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governor = find_devfreq_governor(name);
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}
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return governor;
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}
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static int devfreq_notify_transition(struct devfreq *devfreq,
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struct devfreq_freqs *freqs, unsigned int state)
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{
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if (!devfreq)
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return -EINVAL;
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switch (state) {
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case DEVFREQ_PRECHANGE:
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srcu_notifier_call_chain(&devfreq->transition_notifier_list,
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DEVFREQ_PRECHANGE, freqs);
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break;
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case DEVFREQ_POSTCHANGE:
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srcu_notifier_call_chain(&devfreq->transition_notifier_list,
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DEVFREQ_POSTCHANGE, freqs);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
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u32 flags)
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{
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struct devfreq_freqs freqs;
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unsigned long cur_freq;
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int err = 0;
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if (devfreq->profile->get_cur_freq)
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devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq);
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else
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cur_freq = devfreq->previous_freq;
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freqs.old = cur_freq;
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freqs.new = new_freq;
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devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);
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err = devfreq->profile->target(devfreq->dev.parent, &new_freq, flags);
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if (err) {
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freqs.new = cur_freq;
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devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
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return err;
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}
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/*
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* Print devfreq_frequency trace information between DEVFREQ_PRECHANGE
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* and DEVFREQ_POSTCHANGE because for showing the correct frequency
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* change order of between devfreq device and passive devfreq device.
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*/
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if (trace_devfreq_frequency_enabled() && new_freq != cur_freq)
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trace_devfreq_frequency(devfreq, new_freq, cur_freq);
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freqs.new = new_freq;
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devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
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if (devfreq_update_status(devfreq, new_freq))
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dev_warn(&devfreq->dev,
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"Couldn't update frequency transition information.\n");
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devfreq->previous_freq = new_freq;
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if (devfreq->suspend_freq)
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devfreq->resume_freq = new_freq;
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return err;
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}
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/**
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* devfreq_update_target() - Reevaluate the device and configure frequency
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* on the final stage.
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* @devfreq: the devfreq instance.
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* @freq: the new frequency of parent device. This argument
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* is only used for devfreq device using passive governor.
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*
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* Note: Lock devfreq->lock before calling devfreq_update_target. This function
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* should be only used by both update_devfreq() and devfreq governors.
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*/
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int devfreq_update_target(struct devfreq *devfreq, unsigned long freq)
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{
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unsigned long min_freq, max_freq;
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int err = 0;
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u32 flags = 0;
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lockdep_assert_held(&devfreq->lock);
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if (!devfreq->governor)
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return -EINVAL;
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/* Reevaluate the proper frequency */
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err = devfreq->governor->get_target_freq(devfreq, &freq);
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if (err)
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return err;
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get_freq_range(devfreq, &min_freq, &max_freq);
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if (freq < min_freq) {
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freq = min_freq;
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flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */
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}
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if (freq > max_freq) {
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freq = max_freq;
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flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */
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}
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return devfreq_set_target(devfreq, freq, flags);
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}
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EXPORT_SYMBOL(devfreq_update_target);
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/* Load monitoring helper functions for governors use */
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/**
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* update_devfreq() - Reevaluate the device and configure frequency.
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* @devfreq: the devfreq instance.
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*
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* Note: Lock devfreq->lock before calling update_devfreq
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* This function is exported for governors.
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*/
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int update_devfreq(struct devfreq *devfreq)
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{
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return devfreq_update_target(devfreq, 0L);
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}
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EXPORT_SYMBOL(update_devfreq);
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/**
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* devfreq_monitor() - Periodically poll devfreq objects.
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* @work: the work struct used to run devfreq_monitor periodically.
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*
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*/
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static void devfreq_monitor(struct work_struct *work)
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{
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int err;
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struct devfreq *devfreq = container_of(work,
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struct devfreq, work.work);
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mutex_lock(&devfreq->lock);
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err = update_devfreq(devfreq);
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if (err)
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dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err);
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queue_delayed_work(devfreq_wq, &devfreq->work,
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msecs_to_jiffies(devfreq->profile->polling_ms));
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mutex_unlock(&devfreq->lock);
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trace_devfreq_monitor(devfreq);
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}
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/**
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* devfreq_monitor_start() - Start load monitoring of devfreq instance
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* @devfreq: the devfreq instance.
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*
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* Helper function for starting devfreq device load monitoring. By
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* default delayed work based monitoring is supported. Function
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* to be called from governor in response to DEVFREQ_GOV_START
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* event when device is added to devfreq framework.
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*/
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void devfreq_monitor_start(struct devfreq *devfreq)
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{
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if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN))
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return;
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switch (devfreq->profile->timer) {
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case DEVFREQ_TIMER_DEFERRABLE:
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INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor);
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break;
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case DEVFREQ_TIMER_DELAYED:
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INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor);
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break;
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default:
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return;
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}
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if (devfreq->profile->polling_ms)
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queue_delayed_work(devfreq_wq, &devfreq->work,
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msecs_to_jiffies(devfreq->profile->polling_ms));
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}
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EXPORT_SYMBOL(devfreq_monitor_start);
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/**
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* devfreq_monitor_stop() - Stop load monitoring of a devfreq instance
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* @devfreq: the devfreq instance.
|
|
*
|
|
* Helper function to stop devfreq device load monitoring. Function
|
|
* to be called from governor in response to DEVFREQ_GOV_STOP
|
|
* event when device is removed from devfreq framework.
|
|
*/
|
|
void devfreq_monitor_stop(struct devfreq *devfreq)
|
|
{
|
|
if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN))
|
|
return;
|
|
|
|
cancel_delayed_work_sync(&devfreq->work);
|
|
}
|
|
EXPORT_SYMBOL(devfreq_monitor_stop);
|
|
|
|
/**
|
|
* devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance
|
|
* @devfreq: the devfreq instance.
|
|
*
|
|
* Helper function to suspend devfreq device load monitoring. Function
|
|
* to be called from governor in response to DEVFREQ_GOV_SUSPEND
|
|
* event or when polling interval is set to zero.
|
|
*
|
|
* Note: Though this function is same as devfreq_monitor_stop(),
|
|
* intentionally kept separate to provide hooks for collecting
|
|
* transition statistics.
|
|
*/
|
|
void devfreq_monitor_suspend(struct devfreq *devfreq)
|
|
{
|
|
mutex_lock(&devfreq->lock);
|
|
if (devfreq->stop_polling) {
|
|
mutex_unlock(&devfreq->lock);
|
|
return;
|
|
}
|
|
|
|
devfreq_update_status(devfreq, devfreq->previous_freq);
|
|
devfreq->stop_polling = true;
|
|
mutex_unlock(&devfreq->lock);
|
|
|
|
if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN))
|
|
return;
|
|
|
|
cancel_delayed_work_sync(&devfreq->work);
|
|
}
|
|
EXPORT_SYMBOL(devfreq_monitor_suspend);
|
|
|
|
/**
|
|
* devfreq_monitor_resume() - Resume load monitoring of a devfreq instance
|
|
* @devfreq: the devfreq instance.
|
|
*
|
|
* Helper function to resume devfreq device load monitoring. Function
|
|
* to be called from governor in response to DEVFREQ_GOV_RESUME
|
|
* event or when polling interval is set to non-zero.
|
|
*/
|
|
void devfreq_monitor_resume(struct devfreq *devfreq)
|
|
{
|
|
unsigned long freq;
|
|
|
|
mutex_lock(&devfreq->lock);
|
|
|
|
if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN))
|
|
goto out_update;
|
|
|
|
if (!devfreq->stop_polling)
|
|
goto out;
|
|
|
|
if (!delayed_work_pending(&devfreq->work) &&
|
|
devfreq->profile->polling_ms)
|
|
queue_delayed_work(devfreq_wq, &devfreq->work,
|
|
msecs_to_jiffies(devfreq->profile->polling_ms));
|
|
|
|
out_update:
|
|
devfreq->stats.last_update = get_jiffies_64();
|
|
devfreq->stop_polling = false;
|
|
|
|
if (devfreq->profile->get_cur_freq &&
|
|
!devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq))
|
|
devfreq->previous_freq = freq;
|
|
|
|
out:
|
|
mutex_unlock(&devfreq->lock);
|
|
}
|
|
EXPORT_SYMBOL(devfreq_monitor_resume);
|
|
|
|
/**
|
|
* devfreq_update_interval() - Update device devfreq monitoring interval
|
|
* @devfreq: the devfreq instance.
|
|
* @delay: new polling interval to be set.
|
|
*
|
|
* Helper function to set new load monitoring polling interval. Function
|
|
* to be called from governor in response to DEVFREQ_GOV_UPDATE_INTERVAL event.
|
|
*/
|
|
void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay)
|
|
{
|
|
unsigned int cur_delay = devfreq->profile->polling_ms;
|
|
unsigned int new_delay = *delay;
|
|
|
|
mutex_lock(&devfreq->lock);
|
|
devfreq->profile->polling_ms = new_delay;
|
|
|
|
if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN))
|
|
goto out;
|
|
|
|
if (devfreq->stop_polling)
|
|
goto out;
|
|
|
|
/* if new delay is zero, stop polling */
|
|
if (!new_delay) {
|
|
mutex_unlock(&devfreq->lock);
|
|
cancel_delayed_work_sync(&devfreq->work);
|
|
return;
|
|
}
|
|
|
|
/* if current delay is zero, start polling with new delay */
|
|
if (!cur_delay) {
|
|
queue_delayed_work(devfreq_wq, &devfreq->work,
|
|
msecs_to_jiffies(devfreq->profile->polling_ms));
|
|
goto out;
|
|
}
|
|
|
|
/* if current delay is greater than new delay, restart polling */
|
|
if (cur_delay > new_delay) {
|
|
mutex_unlock(&devfreq->lock);
|
|
cancel_delayed_work_sync(&devfreq->work);
|
|
mutex_lock(&devfreq->lock);
|
|
if (!devfreq->stop_polling)
|
|
queue_delayed_work(devfreq_wq, &devfreq->work,
|
|
msecs_to_jiffies(devfreq->profile->polling_ms));
|
|
}
|
|
out:
|
|
mutex_unlock(&devfreq->lock);
|
|
}
|
|
EXPORT_SYMBOL(devfreq_update_interval);
|
|
|
|
/**
|
|
* devfreq_notifier_call() - Notify that the device frequency requirements
|
|
* has been changed out of devfreq framework.
|
|
* @nb: the notifier_block (supposed to be devfreq->nb)
|
|
* @type: not used
|
|
* @devp: not used
|
|
*
|
|
* Called by a notifier that uses devfreq->nb.
|
|
*/
|
|
static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type,
|
|
void *devp)
|
|
{
|
|
struct devfreq *devfreq = container_of(nb, struct devfreq, nb);
|
|
int err = -EINVAL;
|
|
|
|
mutex_lock(&devfreq->lock);
|
|
|
|
devfreq->scaling_min_freq = find_available_min_freq(devfreq);
|
|
if (!devfreq->scaling_min_freq)
|
|
goto out;
|
|
|
|
devfreq->scaling_max_freq = find_available_max_freq(devfreq);
|
|
if (!devfreq->scaling_max_freq) {
|
|
devfreq->scaling_max_freq = ULONG_MAX;
|
|
goto out;
|
|
}
|
|
|
|
err = update_devfreq(devfreq);
|
|
|
|
out:
|
|
mutex_unlock(&devfreq->lock);
|
|
if (err)
|
|
dev_err(devfreq->dev.parent,
|
|
"failed to update frequency from OPP notifier (%d)\n",
|
|
err);
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/**
|
|
* qos_notifier_call() - Common handler for QoS constraints.
|
|
* @devfreq: the devfreq instance.
|
|
*/
|
|
static int qos_notifier_call(struct devfreq *devfreq)
|
|
{
|
|
int err;
|
|
|
|
mutex_lock(&devfreq->lock);
|
|
err = update_devfreq(devfreq);
|
|
mutex_unlock(&devfreq->lock);
|
|
if (err)
|
|
dev_err(devfreq->dev.parent,
|
|
"failed to update frequency from PM QoS (%d)\n",
|
|
err);
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/**
|
|
* qos_min_notifier_call() - Callback for QoS min_freq changes.
|
|
* @nb: Should be devfreq->nb_min
|
|
*/
|
|
static int qos_min_notifier_call(struct notifier_block *nb,
|
|
unsigned long val, void *ptr)
|
|
{
|
|
return qos_notifier_call(container_of(nb, struct devfreq, nb_min));
|
|
}
|
|
|
|
/**
|
|
* qos_max_notifier_call() - Callback for QoS max_freq changes.
|
|
* @nb: Should be devfreq->nb_max
|
|
*/
|
|
static int qos_max_notifier_call(struct notifier_block *nb,
|
|
unsigned long val, void *ptr)
|
|
{
|
|
return qos_notifier_call(container_of(nb, struct devfreq, nb_max));
|
|
}
|
|
|
|
/**
|
|
* devfreq_dev_release() - Callback for struct device to release the device.
|
|
* @dev: the devfreq device
|
|
*
|
|
* Remove devfreq from the list and release its resources.
|
|
*/
|
|
static void devfreq_dev_release(struct device *dev)
|
|
{
|
|
struct devfreq *devfreq = to_devfreq(dev);
|
|
int err;
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
list_del(&devfreq->node);
|
|
mutex_unlock(&devfreq_list_lock);
|
|
|
|
err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_max,
|
|
DEV_PM_QOS_MAX_FREQUENCY);
|
|
if (err && err != -ENOENT)
|
|
dev_warn(dev->parent,
|
|
"Failed to remove max_freq notifier: %d\n", err);
|
|
err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_min,
|
|
DEV_PM_QOS_MIN_FREQUENCY);
|
|
if (err && err != -ENOENT)
|
|
dev_warn(dev->parent,
|
|
"Failed to remove min_freq notifier: %d\n", err);
|
|
|
|
if (dev_pm_qos_request_active(&devfreq->user_max_freq_req)) {
|
|
err = dev_pm_qos_remove_request(&devfreq->user_max_freq_req);
|
|
if (err < 0)
|
|
dev_warn(dev->parent,
|
|
"Failed to remove max_freq request: %d\n", err);
|
|
}
|
|
if (dev_pm_qos_request_active(&devfreq->user_min_freq_req)) {
|
|
err = dev_pm_qos_remove_request(&devfreq->user_min_freq_req);
|
|
if (err < 0)
|
|
dev_warn(dev->parent,
|
|
"Failed to remove min_freq request: %d\n", err);
|
|
}
|
|
|
|
if (devfreq->profile->exit)
|
|
devfreq->profile->exit(devfreq->dev.parent);
|
|
|
|
if (devfreq->opp_table)
|
|
dev_pm_opp_put_opp_table(devfreq->opp_table);
|
|
|
|
mutex_destroy(&devfreq->lock);
|
|
kfree(devfreq);
|
|
}
|
|
|
|
static void create_sysfs_files(struct devfreq *devfreq,
|
|
const struct devfreq_governor *gov);
|
|
static void remove_sysfs_files(struct devfreq *devfreq,
|
|
const struct devfreq_governor *gov);
|
|
|
|
/**
|
|
* devfreq_add_device() - Add devfreq feature to the device
|
|
* @dev: the device to add devfreq feature.
|
|
* @profile: device-specific profile to run devfreq.
|
|
* @governor_name: name of the policy to choose frequency.
|
|
* @data: private data for the governor. The devfreq framework does not
|
|
* touch this value.
|
|
*/
|
|
struct devfreq *devfreq_add_device(struct device *dev,
|
|
struct devfreq_dev_profile *profile,
|
|
const char *governor_name,
|
|
void *data)
|
|
{
|
|
struct devfreq *devfreq;
|
|
struct devfreq_governor *governor;
|
|
int err = 0;
|
|
|
|
if (!dev || !profile || !governor_name) {
|
|
dev_err(dev, "%s: Invalid parameters.\n", __func__);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
devfreq = find_device_devfreq(dev);
|
|
mutex_unlock(&devfreq_list_lock);
|
|
if (!IS_ERR(devfreq)) {
|
|
dev_err(dev, "%s: devfreq device already exists!\n",
|
|
__func__);
|
|
err = -EINVAL;
|
|
goto err_out;
|
|
}
|
|
|
|
devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL);
|
|
if (!devfreq) {
|
|
err = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
|
|
mutex_init(&devfreq->lock);
|
|
mutex_lock(&devfreq->lock);
|
|
devfreq->dev.parent = dev;
|
|
devfreq->dev.class = devfreq_class;
|
|
devfreq->dev.release = devfreq_dev_release;
|
|
INIT_LIST_HEAD(&devfreq->node);
|
|
devfreq->profile = profile;
|
|
devfreq->previous_freq = profile->initial_freq;
|
|
devfreq->last_status.current_frequency = profile->initial_freq;
|
|
devfreq->data = data;
|
|
devfreq->nb.notifier_call = devfreq_notifier_call;
|
|
|
|
if (devfreq->profile->timer < 0
|
|
|| devfreq->profile->timer >= DEVFREQ_TIMER_NUM) {
|
|
mutex_unlock(&devfreq->lock);
|
|
err = -EINVAL;
|
|
goto err_dev;
|
|
}
|
|
|
|
if (!devfreq->profile->max_state || !devfreq->profile->freq_table) {
|
|
mutex_unlock(&devfreq->lock);
|
|
err = set_freq_table(devfreq);
|
|
if (err < 0)
|
|
goto err_dev;
|
|
mutex_lock(&devfreq->lock);
|
|
}
|
|
|
|
devfreq->scaling_min_freq = find_available_min_freq(devfreq);
|
|
if (!devfreq->scaling_min_freq) {
|
|
mutex_unlock(&devfreq->lock);
|
|
err = -EINVAL;
|
|
goto err_dev;
|
|
}
|
|
|
|
devfreq->scaling_max_freq = find_available_max_freq(devfreq);
|
|
if (!devfreq->scaling_max_freq) {
|
|
mutex_unlock(&devfreq->lock);
|
|
err = -EINVAL;
|
|
goto err_dev;
|
|
}
|
|
|
|
devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev);
|
|
devfreq->opp_table = dev_pm_opp_get_opp_table(dev);
|
|
if (IS_ERR(devfreq->opp_table))
|
|
devfreq->opp_table = NULL;
|
|
|
|
atomic_set(&devfreq->suspend_count, 0);
|
|
|
|
dev_set_name(&devfreq->dev, "%s", dev_name(dev));
|
|
err = device_register(&devfreq->dev);
|
|
if (err) {
|
|
mutex_unlock(&devfreq->lock);
|
|
put_device(&devfreq->dev);
|
|
goto err_out;
|
|
}
|
|
|
|
devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev,
|
|
array3_size(sizeof(unsigned int),
|
|
devfreq->profile->max_state,
|
|
devfreq->profile->max_state),
|
|
GFP_KERNEL);
|
|
if (!devfreq->stats.trans_table) {
|
|
mutex_unlock(&devfreq->lock);
|
|
err = -ENOMEM;
|
|
goto err_devfreq;
|
|
}
|
|
|
|
devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev,
|
|
devfreq->profile->max_state,
|
|
sizeof(*devfreq->stats.time_in_state),
|
|
GFP_KERNEL);
|
|
if (!devfreq->stats.time_in_state) {
|
|
mutex_unlock(&devfreq->lock);
|
|
err = -ENOMEM;
|
|
goto err_devfreq;
|
|
}
|
|
|
|
devfreq->stats.total_trans = 0;
|
|
devfreq->stats.last_update = get_jiffies_64();
|
|
|
|
srcu_init_notifier_head(&devfreq->transition_notifier_list);
|
|
|
|
mutex_unlock(&devfreq->lock);
|
|
|
|
err = dev_pm_qos_add_request(dev, &devfreq->user_min_freq_req,
|
|
DEV_PM_QOS_MIN_FREQUENCY, 0);
|
|
if (err < 0)
|
|
goto err_devfreq;
|
|
err = dev_pm_qos_add_request(dev, &devfreq->user_max_freq_req,
|
|
DEV_PM_QOS_MAX_FREQUENCY,
|
|
PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE);
|
|
if (err < 0)
|
|
goto err_devfreq;
|
|
|
|
devfreq->nb_min.notifier_call = qos_min_notifier_call;
|
|
err = dev_pm_qos_add_notifier(dev, &devfreq->nb_min,
|
|
DEV_PM_QOS_MIN_FREQUENCY);
|
|
if (err)
|
|
goto err_devfreq;
|
|
|
|
devfreq->nb_max.notifier_call = qos_max_notifier_call;
|
|
err = dev_pm_qos_add_notifier(dev, &devfreq->nb_max,
|
|
DEV_PM_QOS_MAX_FREQUENCY);
|
|
if (err)
|
|
goto err_devfreq;
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
|
|
governor = try_then_request_governor(governor_name);
|
|
if (IS_ERR(governor)) {
|
|
dev_err(dev, "%s: Unable to find governor for the device\n",
|
|
__func__);
|
|
err = PTR_ERR(governor);
|
|
goto err_init;
|
|
}
|
|
|
|
devfreq->governor = governor;
|
|
err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START,
|
|
NULL);
|
|
if (err) {
|
|
dev_err(dev, "%s: Unable to start governor for the device\n",
|
|
__func__);
|
|
goto err_init;
|
|
}
|
|
create_sysfs_files(devfreq, devfreq->governor);
|
|
|
|
list_add(&devfreq->node, &devfreq_list);
|
|
|
|
mutex_unlock(&devfreq_list_lock);
|
|
|
|
if (devfreq->profile->is_cooling_device) {
|
|
devfreq->cdev = devfreq_cooling_em_register(devfreq, NULL);
|
|
if (IS_ERR(devfreq->cdev))
|
|
devfreq->cdev = NULL;
|
|
}
|
|
|
|
return devfreq;
|
|
|
|
err_init:
|
|
mutex_unlock(&devfreq_list_lock);
|
|
err_devfreq:
|
|
devfreq_remove_device(devfreq);
|
|
devfreq = NULL;
|
|
err_dev:
|
|
kfree(devfreq);
|
|
err_out:
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(devfreq_add_device);
|
|
|
|
/**
|
|
* devfreq_remove_device() - Remove devfreq feature from a device.
|
|
* @devfreq: the devfreq instance to be removed
|
|
*
|
|
* The opposite of devfreq_add_device().
|
|
*/
|
|
int devfreq_remove_device(struct devfreq *devfreq)
|
|
{
|
|
if (!devfreq)
|
|
return -EINVAL;
|
|
|
|
devfreq_cooling_unregister(devfreq->cdev);
|
|
|
|
if (devfreq->governor) {
|
|
devfreq->governor->event_handler(devfreq,
|
|
DEVFREQ_GOV_STOP, NULL);
|
|
remove_sysfs_files(devfreq, devfreq->governor);
|
|
}
|
|
|
|
device_unregister(&devfreq->dev);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(devfreq_remove_device);
|
|
|
|
static int devm_devfreq_dev_match(struct device *dev, void *res, void *data)
|
|
{
|
|
struct devfreq **r = res;
|
|
|
|
if (WARN_ON(!r || !*r))
|
|
return 0;
|
|
|
|
return *r == data;
|
|
}
|
|
|
|
static void devm_devfreq_dev_release(struct device *dev, void *res)
|
|
{
|
|
devfreq_remove_device(*(struct devfreq **)res);
|
|
}
|
|
|
|
/**
|
|
* devm_devfreq_add_device() - Resource-managed devfreq_add_device()
|
|
* @dev: the device to add devfreq feature.
|
|
* @profile: device-specific profile to run devfreq.
|
|
* @governor_name: name of the policy to choose frequency.
|
|
* @data: private data for the governor. The devfreq framework does not
|
|
* touch this value.
|
|
*
|
|
* This function manages automatically the memory of devfreq device using device
|
|
* resource management and simplify the free operation for memory of devfreq
|
|
* device.
|
|
*/
|
|
struct devfreq *devm_devfreq_add_device(struct device *dev,
|
|
struct devfreq_dev_profile *profile,
|
|
const char *governor_name,
|
|
void *data)
|
|
{
|
|
struct devfreq **ptr, *devfreq;
|
|
|
|
ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
devfreq = devfreq_add_device(dev, profile, governor_name, data);
|
|
if (IS_ERR(devfreq)) {
|
|
devres_free(ptr);
|
|
return devfreq;
|
|
}
|
|
|
|
*ptr = devfreq;
|
|
devres_add(dev, ptr);
|
|
|
|
return devfreq;
|
|
}
|
|
EXPORT_SYMBOL(devm_devfreq_add_device);
|
|
|
|
#ifdef CONFIG_OF
|
|
/*
|
|
* devfreq_get_devfreq_by_node - Get the devfreq device from devicetree
|
|
* @node - pointer to device_node
|
|
*
|
|
* return the instance of devfreq device
|
|
*/
|
|
struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)
|
|
{
|
|
struct devfreq *devfreq;
|
|
|
|
if (!node)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
list_for_each_entry(devfreq, &devfreq_list, node) {
|
|
if (devfreq->dev.parent
|
|
&& devfreq->dev.parent->of_node == node) {
|
|
mutex_unlock(&devfreq_list_lock);
|
|
return devfreq;
|
|
}
|
|
}
|
|
mutex_unlock(&devfreq_list_lock);
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
/*
|
|
* devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree
|
|
* @dev - instance to the given device
|
|
* @phandle_name - name of property holding a phandle value
|
|
* @index - index into list of devfreq
|
|
*
|
|
* return the instance of devfreq device
|
|
*/
|
|
struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
|
|
const char *phandle_name, int index)
|
|
{
|
|
struct device_node *node;
|
|
struct devfreq *devfreq;
|
|
|
|
if (!dev || !phandle_name)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!dev->of_node)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
node = of_parse_phandle(dev->of_node, phandle_name, index);
|
|
if (!node)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
devfreq = devfreq_get_devfreq_by_node(node);
|
|
of_node_put(node);
|
|
|
|
return devfreq;
|
|
}
|
|
|
|
#else
|
|
struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
|
|
const char *phandle_name, int index)
|
|
{
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
#endif /* CONFIG_OF */
|
|
EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_node);
|
|
EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle);
|
|
|
|
/**
|
|
* devm_devfreq_remove_device() - Resource-managed devfreq_remove_device()
|
|
* @dev: the device from which to remove devfreq feature.
|
|
* @devfreq: the devfreq instance to be removed
|
|
*/
|
|
void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq)
|
|
{
|
|
WARN_ON(devres_release(dev, devm_devfreq_dev_release,
|
|
devm_devfreq_dev_match, devfreq));
|
|
}
|
|
EXPORT_SYMBOL(devm_devfreq_remove_device);
|
|
|
|
/**
|
|
* devfreq_suspend_device() - Suspend devfreq of a device.
|
|
* @devfreq: the devfreq instance to be suspended
|
|
*
|
|
* This function is intended to be called by the pm callbacks
|
|
* (e.g., runtime_suspend, suspend) of the device driver that
|
|
* holds the devfreq.
|
|
*/
|
|
int devfreq_suspend_device(struct devfreq *devfreq)
|
|
{
|
|
int ret;
|
|
|
|
if (!devfreq)
|
|
return -EINVAL;
|
|
|
|
if (atomic_inc_return(&devfreq->suspend_count) > 1)
|
|
return 0;
|
|
|
|
if (devfreq->governor) {
|
|
ret = devfreq->governor->event_handler(devfreq,
|
|
DEVFREQ_GOV_SUSPEND, NULL);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (devfreq->suspend_freq) {
|
|
mutex_lock(&devfreq->lock);
|
|
ret = devfreq_set_target(devfreq, devfreq->suspend_freq, 0);
|
|
mutex_unlock(&devfreq->lock);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(devfreq_suspend_device);
|
|
|
|
/**
|
|
* devfreq_resume_device() - Resume devfreq of a device.
|
|
* @devfreq: the devfreq instance to be resumed
|
|
*
|
|
* This function is intended to be called by the pm callbacks
|
|
* (e.g., runtime_resume, resume) of the device driver that
|
|
* holds the devfreq.
|
|
*/
|
|
int devfreq_resume_device(struct devfreq *devfreq)
|
|
{
|
|
int ret;
|
|
|
|
if (!devfreq)
|
|
return -EINVAL;
|
|
|
|
if (atomic_dec_return(&devfreq->suspend_count) >= 1)
|
|
return 0;
|
|
|
|
if (devfreq->resume_freq) {
|
|
mutex_lock(&devfreq->lock);
|
|
ret = devfreq_set_target(devfreq, devfreq->resume_freq, 0);
|
|
mutex_unlock(&devfreq->lock);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (devfreq->governor) {
|
|
ret = devfreq->governor->event_handler(devfreq,
|
|
DEVFREQ_GOV_RESUME, NULL);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(devfreq_resume_device);
|
|
|
|
/**
|
|
* devfreq_suspend() - Suspend devfreq governors and devices
|
|
*
|
|
* Called during system wide Suspend/Hibernate cycles for suspending governors
|
|
* and devices preserving the state for resume. On some platforms the devfreq
|
|
* device must have precise state (frequency) after resume in order to provide
|
|
* fully operating setup.
|
|
*/
|
|
void devfreq_suspend(void)
|
|
{
|
|
struct devfreq *devfreq;
|
|
int ret;
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
list_for_each_entry(devfreq, &devfreq_list, node) {
|
|
ret = devfreq_suspend_device(devfreq);
|
|
if (ret)
|
|
dev_err(&devfreq->dev,
|
|
"failed to suspend devfreq device\n");
|
|
}
|
|
mutex_unlock(&devfreq_list_lock);
|
|
}
|
|
|
|
/**
|
|
* devfreq_resume() - Resume devfreq governors and devices
|
|
*
|
|
* Called during system wide Suspend/Hibernate cycle for resuming governors and
|
|
* devices that are suspended with devfreq_suspend().
|
|
*/
|
|
void devfreq_resume(void)
|
|
{
|
|
struct devfreq *devfreq;
|
|
int ret;
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
list_for_each_entry(devfreq, &devfreq_list, node) {
|
|
ret = devfreq_resume_device(devfreq);
|
|
if (ret)
|
|
dev_warn(&devfreq->dev,
|
|
"failed to resume devfreq device\n");
|
|
}
|
|
mutex_unlock(&devfreq_list_lock);
|
|
}
|
|
|
|
/**
|
|
* devfreq_add_governor() - Add devfreq governor
|
|
* @governor: the devfreq governor to be added
|
|
*/
|
|
int devfreq_add_governor(struct devfreq_governor *governor)
|
|
{
|
|
struct devfreq_governor *g;
|
|
struct devfreq *devfreq;
|
|
int err = 0;
|
|
|
|
if (!governor) {
|
|
pr_err("%s: Invalid parameters.\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
g = find_devfreq_governor(governor->name);
|
|
if (!IS_ERR(g)) {
|
|
pr_err("%s: governor %s already registered\n", __func__,
|
|
g->name);
|
|
err = -EINVAL;
|
|
goto err_out;
|
|
}
|
|
|
|
list_add(&governor->node, &devfreq_governor_list);
|
|
|
|
list_for_each_entry(devfreq, &devfreq_list, node) {
|
|
int ret = 0;
|
|
struct device *dev = devfreq->dev.parent;
|
|
|
|
if (!strncmp(devfreq->governor->name, governor->name,
|
|
DEVFREQ_NAME_LEN)) {
|
|
/* The following should never occur */
|
|
if (devfreq->governor) {
|
|
dev_warn(dev,
|
|
"%s: Governor %s already present\n",
|
|
__func__, devfreq->governor->name);
|
|
ret = devfreq->governor->event_handler(devfreq,
|
|
DEVFREQ_GOV_STOP, NULL);
|
|
if (ret) {
|
|
dev_warn(dev,
|
|
"%s: Governor %s stop = %d\n",
|
|
__func__,
|
|
devfreq->governor->name, ret);
|
|
}
|
|
/* Fall through */
|
|
}
|
|
devfreq->governor = governor;
|
|
ret = devfreq->governor->event_handler(devfreq,
|
|
DEVFREQ_GOV_START, NULL);
|
|
if (ret) {
|
|
dev_warn(dev, "%s: Governor %s start=%d\n",
|
|
__func__, devfreq->governor->name,
|
|
ret);
|
|
}
|
|
}
|
|
}
|
|
|
|
err_out:
|
|
mutex_unlock(&devfreq_list_lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(devfreq_add_governor);
|
|
|
|
static void devm_devfreq_remove_governor(void *governor)
|
|
{
|
|
WARN_ON(devfreq_remove_governor(governor));
|
|
}
|
|
|
|
/**
|
|
* devm_devfreq_add_governor() - Add devfreq governor
|
|
* @dev: device which adds devfreq governor
|
|
* @governor: the devfreq governor to be added
|
|
*
|
|
* This is a resource-managed variant of devfreq_add_governor().
|
|
*/
|
|
int devm_devfreq_add_governor(struct device *dev,
|
|
struct devfreq_governor *governor)
|
|
{
|
|
int err;
|
|
|
|
err = devfreq_add_governor(governor);
|
|
if (err)
|
|
return err;
|
|
|
|
return devm_add_action_or_reset(dev, devm_devfreq_remove_governor,
|
|
governor);
|
|
}
|
|
EXPORT_SYMBOL(devm_devfreq_add_governor);
|
|
|
|
/**
|
|
* devfreq_remove_governor() - Remove devfreq feature from a device.
|
|
* @governor: the devfreq governor to be removed
|
|
*/
|
|
int devfreq_remove_governor(struct devfreq_governor *governor)
|
|
{
|
|
struct devfreq_governor *g;
|
|
struct devfreq *devfreq;
|
|
int err = 0;
|
|
|
|
if (!governor) {
|
|
pr_err("%s: Invalid parameters.\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
g = find_devfreq_governor(governor->name);
|
|
if (IS_ERR(g)) {
|
|
pr_err("%s: governor %s not registered\n", __func__,
|
|
governor->name);
|
|
err = PTR_ERR(g);
|
|
goto err_out;
|
|
}
|
|
list_for_each_entry(devfreq, &devfreq_list, node) {
|
|
int ret;
|
|
struct device *dev = devfreq->dev.parent;
|
|
|
|
if (!strncmp(devfreq->governor->name, governor->name,
|
|
DEVFREQ_NAME_LEN)) {
|
|
/* we should have a devfreq governor! */
|
|
if (!devfreq->governor) {
|
|
dev_warn(dev, "%s: Governor %s NOT present\n",
|
|
__func__, governor->name);
|
|
continue;
|
|
/* Fall through */
|
|
}
|
|
ret = devfreq->governor->event_handler(devfreq,
|
|
DEVFREQ_GOV_STOP, NULL);
|
|
if (ret) {
|
|
dev_warn(dev, "%s: Governor %s stop=%d\n",
|
|
__func__, devfreq->governor->name,
|
|
ret);
|
|
}
|
|
devfreq->governor = NULL;
|
|
}
|
|
}
|
|
|
|
list_del(&governor->node);
|
|
err_out:
|
|
mutex_unlock(&devfreq_list_lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(devfreq_remove_governor);
|
|
|
|
static ssize_t name_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
return sprintf(buf, "%s\n", dev_name(df->dev.parent));
|
|
}
|
|
static DEVICE_ATTR_RO(name);
|
|
|
|
static ssize_t governor_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
|
|
if (!df->governor)
|
|
return -EINVAL;
|
|
|
|
return sprintf(buf, "%s\n", df->governor->name);
|
|
}
|
|
|
|
static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
int ret;
|
|
char str_governor[DEVFREQ_NAME_LEN + 1];
|
|
const struct devfreq_governor *governor, *prev_governor;
|
|
|
|
if (!df->governor)
|
|
return -EINVAL;
|
|
|
|
ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor);
|
|
if (ret != 1)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
governor = try_then_request_governor(str_governor);
|
|
if (IS_ERR(governor)) {
|
|
ret = PTR_ERR(governor);
|
|
goto out;
|
|
}
|
|
if (df->governor == governor) {
|
|
ret = 0;
|
|
goto out;
|
|
} else if (IS_SUPPORTED_FLAG(df->governor->flags, IMMUTABLE)
|
|
|| IS_SUPPORTED_FLAG(governor->flags, IMMUTABLE)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Stop the current governor and remove the specific sysfs files
|
|
* which depend on current governor.
|
|
*/
|
|
ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL);
|
|
if (ret) {
|
|
dev_warn(dev, "%s: Governor %s not stopped(%d)\n",
|
|
__func__, df->governor->name, ret);
|
|
goto out;
|
|
}
|
|
remove_sysfs_files(df, df->governor);
|
|
|
|
/*
|
|
* Start the new governor and create the specific sysfs files
|
|
* which depend on the new governor.
|
|
*/
|
|
prev_governor = df->governor;
|
|
df->governor = governor;
|
|
ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
|
|
if (ret) {
|
|
dev_warn(dev, "%s: Governor %s not started(%d)\n",
|
|
__func__, df->governor->name, ret);
|
|
|
|
/* Restore previous governor */
|
|
df->governor = prev_governor;
|
|
ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
|
|
if (ret) {
|
|
dev_err(dev,
|
|
"%s: reverting to Governor %s failed (%d)\n",
|
|
__func__, prev_governor->name, ret);
|
|
df->governor = NULL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create the sysfs files for the new governor. But if failed to start
|
|
* the new governor, restore the sysfs files of previous governor.
|
|
*/
|
|
create_sysfs_files(df, df->governor);
|
|
|
|
out:
|
|
mutex_unlock(&devfreq_list_lock);
|
|
|
|
if (!ret)
|
|
ret = count;
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR_RW(governor);
|
|
|
|
static ssize_t available_governors_show(struct device *d,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct devfreq *df = to_devfreq(d);
|
|
ssize_t count = 0;
|
|
|
|
if (!df->governor)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
|
|
/*
|
|
* The devfreq with immutable governor (e.g., passive) shows
|
|
* only own governor.
|
|
*/
|
|
if (IS_SUPPORTED_FLAG(df->governor->flags, IMMUTABLE)) {
|
|
count = scnprintf(&buf[count], DEVFREQ_NAME_LEN,
|
|
"%s ", df->governor->name);
|
|
/*
|
|
* The devfreq device shows the registered governor except for
|
|
* immutable governors such as passive governor .
|
|
*/
|
|
} else {
|
|
struct devfreq_governor *governor;
|
|
|
|
list_for_each_entry(governor, &devfreq_governor_list, node) {
|
|
if (IS_SUPPORTED_FLAG(governor->flags, IMMUTABLE))
|
|
continue;
|
|
count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
|
|
"%s ", governor->name);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&devfreq_list_lock);
|
|
|
|
/* Truncate the trailing space */
|
|
if (count)
|
|
count--;
|
|
|
|
count += sprintf(&buf[count], "\n");
|
|
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR_RO(available_governors);
|
|
|
|
static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
unsigned long freq;
|
|
struct devfreq *df = to_devfreq(dev);
|
|
|
|
if (!df->profile)
|
|
return -EINVAL;
|
|
|
|
if (df->profile->get_cur_freq &&
|
|
!df->profile->get_cur_freq(df->dev.parent, &freq))
|
|
return sprintf(buf, "%lu\n", freq);
|
|
|
|
return sprintf(buf, "%lu\n", df->previous_freq);
|
|
}
|
|
static DEVICE_ATTR_RO(cur_freq);
|
|
|
|
static ssize_t target_freq_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
|
|
return sprintf(buf, "%lu\n", df->previous_freq);
|
|
}
|
|
static DEVICE_ATTR_RO(target_freq);
|
|
|
|
static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
unsigned long value;
|
|
int ret;
|
|
|
|
/*
|
|
* Protect against theoretical sysfs writes between
|
|
* device_add and dev_pm_qos_add_request
|
|
*/
|
|
if (!dev_pm_qos_request_active(&df->user_min_freq_req))
|
|
return -EAGAIN;
|
|
|
|
ret = sscanf(buf, "%lu", &value);
|
|
if (ret != 1)
|
|
return -EINVAL;
|
|
|
|
/* Round down to kHz for PM QoS */
|
|
ret = dev_pm_qos_update_request(&df->user_min_freq_req,
|
|
value / HZ_PER_KHZ);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
unsigned long min_freq, max_freq;
|
|
|
|
mutex_lock(&df->lock);
|
|
get_freq_range(df, &min_freq, &max_freq);
|
|
mutex_unlock(&df->lock);
|
|
|
|
return sprintf(buf, "%lu\n", min_freq);
|
|
}
|
|
static DEVICE_ATTR_RW(min_freq);
|
|
|
|
static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
unsigned long value;
|
|
int ret;
|
|
|
|
/*
|
|
* Protect against theoretical sysfs writes between
|
|
* device_add and dev_pm_qos_add_request
|
|
*/
|
|
if (!dev_pm_qos_request_active(&df->user_max_freq_req))
|
|
return -EINVAL;
|
|
|
|
ret = sscanf(buf, "%lu", &value);
|
|
if (ret != 1)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* PM QoS frequencies are in kHz so we need to convert. Convert by
|
|
* rounding upwards so that the acceptable interval never shrinks.
|
|
*
|
|
* For example if the user writes "666666666" to sysfs this value will
|
|
* be converted to 666667 kHz and back to 666667000 Hz before an OPP
|
|
* lookup, this ensures that an OPP of 666666666Hz is still accepted.
|
|
*
|
|
* A value of zero means "no limit".
|
|
*/
|
|
if (value)
|
|
value = DIV_ROUND_UP(value, HZ_PER_KHZ);
|
|
else
|
|
value = PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE;
|
|
|
|
ret = dev_pm_qos_update_request(&df->user_max_freq_req, value);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
unsigned long min_freq, max_freq;
|
|
|
|
mutex_lock(&df->lock);
|
|
get_freq_range(df, &min_freq, &max_freq);
|
|
mutex_unlock(&df->lock);
|
|
|
|
return sprintf(buf, "%lu\n", max_freq);
|
|
}
|
|
static DEVICE_ATTR_RW(max_freq);
|
|
|
|
static ssize_t available_frequencies_show(struct device *d,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct devfreq *df = to_devfreq(d);
|
|
ssize_t count = 0;
|
|
int i;
|
|
|
|
if (!df->profile)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&df->lock);
|
|
|
|
for (i = 0; i < df->profile->max_state; i++)
|
|
count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
|
|
"%lu ", df->profile->freq_table[i]);
|
|
|
|
mutex_unlock(&df->lock);
|
|
/* Truncate the trailing space */
|
|
if (count)
|
|
count--;
|
|
|
|
count += sprintf(&buf[count], "\n");
|
|
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR_RO(available_frequencies);
|
|
|
|
static ssize_t trans_stat_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
ssize_t len;
|
|
int i, j;
|
|
unsigned int max_state;
|
|
|
|
if (!df->profile)
|
|
return -EINVAL;
|
|
max_state = df->profile->max_state;
|
|
|
|
if (max_state == 0)
|
|
return sprintf(buf, "Not Supported.\n");
|
|
|
|
mutex_lock(&df->lock);
|
|
if (!df->stop_polling &&
|
|
devfreq_update_status(df, df->previous_freq)) {
|
|
mutex_unlock(&df->lock);
|
|
return 0;
|
|
}
|
|
mutex_unlock(&df->lock);
|
|
|
|
len = sprintf(buf, " From : To\n");
|
|
len += sprintf(buf + len, " :");
|
|
for (i = 0; i < max_state; i++)
|
|
len += sprintf(buf + len, "%10lu",
|
|
df->profile->freq_table[i]);
|
|
|
|
len += sprintf(buf + len, " time(ms)\n");
|
|
|
|
for (i = 0; i < max_state; i++) {
|
|
if (df->profile->freq_table[i]
|
|
== df->previous_freq) {
|
|
len += sprintf(buf + len, "*");
|
|
} else {
|
|
len += sprintf(buf + len, " ");
|
|
}
|
|
len += sprintf(buf + len, "%10lu:",
|
|
df->profile->freq_table[i]);
|
|
for (j = 0; j < max_state; j++)
|
|
len += sprintf(buf + len, "%10u",
|
|
df->stats.trans_table[(i * max_state) + j]);
|
|
|
|
len += sprintf(buf + len, "%10llu\n", (u64)
|
|
jiffies64_to_msecs(df->stats.time_in_state[i]));
|
|
}
|
|
|
|
len += sprintf(buf + len, "Total transition : %u\n",
|
|
df->stats.total_trans);
|
|
return len;
|
|
}
|
|
|
|
static ssize_t trans_stat_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
int err, value;
|
|
|
|
if (!df->profile)
|
|
return -EINVAL;
|
|
|
|
if (df->profile->max_state == 0)
|
|
return count;
|
|
|
|
err = kstrtoint(buf, 10, &value);
|
|
if (err || value != 0)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&df->lock);
|
|
memset(df->stats.time_in_state, 0, (df->profile->max_state *
|
|
sizeof(*df->stats.time_in_state)));
|
|
memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int),
|
|
df->profile->max_state,
|
|
df->profile->max_state));
|
|
df->stats.total_trans = 0;
|
|
df->stats.last_update = get_jiffies_64();
|
|
mutex_unlock(&df->lock);
|
|
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR_RW(trans_stat);
|
|
|
|
static struct attribute *devfreq_attrs[] = {
|
|
&dev_attr_name.attr,
|
|
&dev_attr_governor.attr,
|
|
&dev_attr_available_governors.attr,
|
|
&dev_attr_cur_freq.attr,
|
|
&dev_attr_available_frequencies.attr,
|
|
&dev_attr_target_freq.attr,
|
|
&dev_attr_min_freq.attr,
|
|
&dev_attr_max_freq.attr,
|
|
&dev_attr_trans_stat.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(devfreq);
|
|
|
|
static ssize_t polling_interval_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
|
|
if (!df->profile)
|
|
return -EINVAL;
|
|
|
|
return sprintf(buf, "%d\n", df->profile->polling_ms);
|
|
}
|
|
|
|
static ssize_t polling_interval_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
unsigned int value;
|
|
int ret;
|
|
|
|
if (!df->governor)
|
|
return -EINVAL;
|
|
|
|
ret = sscanf(buf, "%u", &value);
|
|
if (ret != 1)
|
|
return -EINVAL;
|
|
|
|
df->governor->event_handler(df, DEVFREQ_GOV_UPDATE_INTERVAL, &value);
|
|
ret = count;
|
|
|
|
return ret;
|
|
}
|
|
static DEVICE_ATTR_RW(polling_interval);
|
|
|
|
static ssize_t timer_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
|
|
if (!df->profile)
|
|
return -EINVAL;
|
|
|
|
return sprintf(buf, "%s\n", timer_name[df->profile->timer]);
|
|
}
|
|
|
|
static ssize_t timer_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct devfreq *df = to_devfreq(dev);
|
|
char str_timer[DEVFREQ_NAME_LEN + 1];
|
|
int timer = -1;
|
|
int ret = 0, i;
|
|
|
|
if (!df->governor || !df->profile)
|
|
return -EINVAL;
|
|
|
|
ret = sscanf(buf, "%16s", str_timer);
|
|
if (ret != 1)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < DEVFREQ_TIMER_NUM; i++) {
|
|
if (!strncmp(timer_name[i], str_timer, DEVFREQ_NAME_LEN)) {
|
|
timer = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (timer < 0) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (df->profile->timer == timer) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&df->lock);
|
|
df->profile->timer = timer;
|
|
mutex_unlock(&df->lock);
|
|
|
|
ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL);
|
|
if (ret) {
|
|
dev_warn(dev, "%s: Governor %s not stopped(%d)\n",
|
|
__func__, df->governor->name, ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
|
|
if (ret)
|
|
dev_warn(dev, "%s: Governor %s not started(%d)\n",
|
|
__func__, df->governor->name, ret);
|
|
out:
|
|
return ret ? ret : count;
|
|
}
|
|
static DEVICE_ATTR_RW(timer);
|
|
|
|
#define CREATE_SYSFS_FILE(df, name) \
|
|
{ \
|
|
int ret; \
|
|
ret = sysfs_create_file(&df->dev.kobj, &dev_attr_##name.attr); \
|
|
if (ret < 0) { \
|
|
dev_warn(&df->dev, \
|
|
"Unable to create attr(%s)\n", "##name"); \
|
|
} \
|
|
} \
|
|
|
|
/* Create the specific sysfs files which depend on each governor. */
|
|
static void create_sysfs_files(struct devfreq *devfreq,
|
|
const struct devfreq_governor *gov)
|
|
{
|
|
if (IS_SUPPORTED_ATTR(gov->attrs, POLLING_INTERVAL))
|
|
CREATE_SYSFS_FILE(devfreq, polling_interval);
|
|
if (IS_SUPPORTED_ATTR(gov->attrs, TIMER))
|
|
CREATE_SYSFS_FILE(devfreq, timer);
|
|
}
|
|
|
|
/* Remove the specific sysfs files which depend on each governor. */
|
|
static void remove_sysfs_files(struct devfreq *devfreq,
|
|
const struct devfreq_governor *gov)
|
|
{
|
|
if (IS_SUPPORTED_ATTR(gov->attrs, POLLING_INTERVAL))
|
|
sysfs_remove_file(&devfreq->dev.kobj,
|
|
&dev_attr_polling_interval.attr);
|
|
if (IS_SUPPORTED_ATTR(gov->attrs, TIMER))
|
|
sysfs_remove_file(&devfreq->dev.kobj, &dev_attr_timer.attr);
|
|
}
|
|
|
|
/**
|
|
* devfreq_summary_show() - Show the summary of the devfreq devices
|
|
* @s: seq_file instance to show the summary of devfreq devices
|
|
* @data: not used
|
|
*
|
|
* Show the summary of the devfreq devices via 'devfreq_summary' debugfs file.
|
|
* It helps that user can know the detailed information of the devfreq devices.
|
|
*
|
|
* Return 0 always because it shows the information without any data change.
|
|
*/
|
|
static int devfreq_summary_show(struct seq_file *s, void *data)
|
|
{
|
|
struct devfreq *devfreq;
|
|
struct devfreq *p_devfreq = NULL;
|
|
unsigned long cur_freq, min_freq, max_freq;
|
|
unsigned int polling_ms;
|
|
unsigned int timer;
|
|
|
|
seq_printf(s, "%-30s %-30s %-15s %-10s %10s %12s %12s %12s\n",
|
|
"dev",
|
|
"parent_dev",
|
|
"governor",
|
|
"timer",
|
|
"polling_ms",
|
|
"cur_freq_Hz",
|
|
"min_freq_Hz",
|
|
"max_freq_Hz");
|
|
seq_printf(s, "%30s %30s %15s %10s %10s %12s %12s %12s\n",
|
|
"------------------------------",
|
|
"------------------------------",
|
|
"---------------",
|
|
"----------",
|
|
"----------",
|
|
"------------",
|
|
"------------",
|
|
"------------");
|
|
|
|
mutex_lock(&devfreq_list_lock);
|
|
|
|
list_for_each_entry_reverse(devfreq, &devfreq_list, node) {
|
|
#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE)
|
|
if (!strncmp(devfreq->governor->name, DEVFREQ_GOV_PASSIVE,
|
|
DEVFREQ_NAME_LEN)) {
|
|
struct devfreq_passive_data *data = devfreq->data;
|
|
|
|
if (data)
|
|
p_devfreq = data->parent;
|
|
} else {
|
|
p_devfreq = NULL;
|
|
}
|
|
#endif
|
|
|
|
mutex_lock(&devfreq->lock);
|
|
cur_freq = devfreq->previous_freq;
|
|
get_freq_range(devfreq, &min_freq, &max_freq);
|
|
timer = devfreq->profile->timer;
|
|
|
|
if (IS_SUPPORTED_ATTR(devfreq->governor->attrs, POLLING_INTERVAL))
|
|
polling_ms = devfreq->profile->polling_ms;
|
|
else
|
|
polling_ms = 0;
|
|
mutex_unlock(&devfreq->lock);
|
|
|
|
seq_printf(s,
|
|
"%-30s %-30s %-15s %-10s %10d %12ld %12ld %12ld\n",
|
|
dev_name(&devfreq->dev),
|
|
p_devfreq ? dev_name(&p_devfreq->dev) : "null",
|
|
devfreq->governor->name,
|
|
polling_ms ? timer_name[timer] : "null",
|
|
polling_ms,
|
|
cur_freq,
|
|
min_freq,
|
|
max_freq);
|
|
}
|
|
|
|
mutex_unlock(&devfreq_list_lock);
|
|
|
|
return 0;
|
|
}
|
|
DEFINE_SHOW_ATTRIBUTE(devfreq_summary);
|
|
|
|
static int __init devfreq_init(void)
|
|
{
|
|
devfreq_class = class_create(THIS_MODULE, "devfreq");
|
|
if (IS_ERR(devfreq_class)) {
|
|
pr_err("%s: couldn't create class\n", __FILE__);
|
|
return PTR_ERR(devfreq_class);
|
|
}
|
|
|
|
devfreq_wq = create_freezable_workqueue("devfreq_wq");
|
|
if (!devfreq_wq) {
|
|
class_destroy(devfreq_class);
|
|
pr_err("%s: couldn't create workqueue\n", __FILE__);
|
|
return -ENOMEM;
|
|
}
|
|
devfreq_class->dev_groups = devfreq_groups;
|
|
|
|
devfreq_debugfs = debugfs_create_dir("devfreq", NULL);
|
|
debugfs_create_file("devfreq_summary", 0444,
|
|
devfreq_debugfs, NULL,
|
|
&devfreq_summary_fops);
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(devfreq_init);
|
|
|
|
/*
|
|
* The following are helper functions for devfreq user device drivers with
|
|
* OPP framework.
|
|
*/
|
|
|
|
/**
|
|
* devfreq_recommended_opp() - Helper function to get proper OPP for the
|
|
* freq value given to target callback.
|
|
* @dev: The devfreq user device. (parent of devfreq)
|
|
* @freq: The frequency given to target function
|
|
* @flags: Flags handed from devfreq framework.
|
|
*
|
|
* The callers are required to call dev_pm_opp_put() for the returned OPP after
|
|
* use.
|
|
*/
|
|
struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
|
|
unsigned long *freq,
|
|
u32 flags)
|
|
{
|
|
struct dev_pm_opp *opp;
|
|
|
|
if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) {
|
|
/* The freq is an upper bound. opp should be lower */
|
|
opp = dev_pm_opp_find_freq_floor(dev, freq);
|
|
|
|
/* If not available, use the closest opp */
|
|
if (opp == ERR_PTR(-ERANGE))
|
|
opp = dev_pm_opp_find_freq_ceil(dev, freq);
|
|
} else {
|
|
/* The freq is an lower bound. opp should be higher */
|
|
opp = dev_pm_opp_find_freq_ceil(dev, freq);
|
|
|
|
/* If not available, use the closest opp */
|
|
if (opp == ERR_PTR(-ERANGE))
|
|
opp = dev_pm_opp_find_freq_floor(dev, freq);
|
|
}
|
|
|
|
return opp;
|
|
}
|
|
EXPORT_SYMBOL(devfreq_recommended_opp);
|
|
|
|
/**
|
|
* devfreq_register_opp_notifier() - Helper function to get devfreq notified
|
|
* for any changes in the OPP availability
|
|
* changes
|
|
* @dev: The devfreq user device. (parent of devfreq)
|
|
* @devfreq: The devfreq object.
|
|
*/
|
|
int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq)
|
|
{
|
|
return dev_pm_opp_register_notifier(dev, &devfreq->nb);
|
|
}
|
|
EXPORT_SYMBOL(devfreq_register_opp_notifier);
|
|
|
|
/**
|
|
* devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq
|
|
* notified for any changes in the OPP
|
|
* availability changes anymore.
|
|
* @dev: The devfreq user device. (parent of devfreq)
|
|
* @devfreq: The devfreq object.
|
|
*
|
|
* At exit() callback of devfreq_dev_profile, this must be included if
|
|
* devfreq_recommended_opp is used.
|
|
*/
|
|
int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq)
|
|
{
|
|
return dev_pm_opp_unregister_notifier(dev, &devfreq->nb);
|
|
}
|
|
EXPORT_SYMBOL(devfreq_unregister_opp_notifier);
|
|
|
|
static void devm_devfreq_opp_release(struct device *dev, void *res)
|
|
{
|
|
devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res);
|
|
}
|
|
|
|
/**
|
|
* devm_devfreq_register_opp_notifier() - Resource-managed
|
|
* devfreq_register_opp_notifier()
|
|
* @dev: The devfreq user device. (parent of devfreq)
|
|
* @devfreq: The devfreq object.
|
|
*/
|
|
int devm_devfreq_register_opp_notifier(struct device *dev,
|
|
struct devfreq *devfreq)
|
|
{
|
|
struct devfreq **ptr;
|
|
int ret;
|
|
|
|
ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
ret = devfreq_register_opp_notifier(dev, devfreq);
|
|
if (ret) {
|
|
devres_free(ptr);
|
|
return ret;
|
|
}
|
|
|
|
*ptr = devfreq;
|
|
devres_add(dev, ptr);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(devm_devfreq_register_opp_notifier);
|
|
|
|
/**
|
|
* devm_devfreq_unregister_opp_notifier() - Resource-managed
|
|
* devfreq_unregister_opp_notifier()
|
|
* @dev: The devfreq user device. (parent of devfreq)
|
|
* @devfreq: The devfreq object.
|
|
*/
|
|
void devm_devfreq_unregister_opp_notifier(struct device *dev,
|
|
struct devfreq *devfreq)
|
|
{
|
|
WARN_ON(devres_release(dev, devm_devfreq_opp_release,
|
|
devm_devfreq_dev_match, devfreq));
|
|
}
|
|
EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier);
|
|
|
|
/**
|
|
* devfreq_register_notifier() - Register a driver with devfreq
|
|
* @devfreq: The devfreq object.
|
|
* @nb: The notifier block to register.
|
|
* @list: DEVFREQ_TRANSITION_NOTIFIER.
|
|
*/
|
|
int devfreq_register_notifier(struct devfreq *devfreq,
|
|
struct notifier_block *nb,
|
|
unsigned int list)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!devfreq)
|
|
return -EINVAL;
|
|
|
|
switch (list) {
|
|
case DEVFREQ_TRANSITION_NOTIFIER:
|
|
ret = srcu_notifier_chain_register(
|
|
&devfreq->transition_notifier_list, nb);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(devfreq_register_notifier);
|
|
|
|
/*
|
|
* devfreq_unregister_notifier() - Unregister a driver with devfreq
|
|
* @devfreq: The devfreq object.
|
|
* @nb: The notifier block to be unregistered.
|
|
* @list: DEVFREQ_TRANSITION_NOTIFIER.
|
|
*/
|
|
int devfreq_unregister_notifier(struct devfreq *devfreq,
|
|
struct notifier_block *nb,
|
|
unsigned int list)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!devfreq)
|
|
return -EINVAL;
|
|
|
|
switch (list) {
|
|
case DEVFREQ_TRANSITION_NOTIFIER:
|
|
ret = srcu_notifier_chain_unregister(
|
|
&devfreq->transition_notifier_list, nb);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(devfreq_unregister_notifier);
|
|
|
|
struct devfreq_notifier_devres {
|
|
struct devfreq *devfreq;
|
|
struct notifier_block *nb;
|
|
unsigned int list;
|
|
};
|
|
|
|
static void devm_devfreq_notifier_release(struct device *dev, void *res)
|
|
{
|
|
struct devfreq_notifier_devres *this = res;
|
|
|
|
devfreq_unregister_notifier(this->devfreq, this->nb, this->list);
|
|
}
|
|
|
|
/**
|
|
* devm_devfreq_register_notifier()
|
|
* - Resource-managed devfreq_register_notifier()
|
|
* @dev: The devfreq user device. (parent of devfreq)
|
|
* @devfreq: The devfreq object.
|
|
* @nb: The notifier block to be unregistered.
|
|
* @list: DEVFREQ_TRANSITION_NOTIFIER.
|
|
*/
|
|
int devm_devfreq_register_notifier(struct device *dev,
|
|
struct devfreq *devfreq,
|
|
struct notifier_block *nb,
|
|
unsigned int list)
|
|
{
|
|
struct devfreq_notifier_devres *ptr;
|
|
int ret;
|
|
|
|
ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr),
|
|
GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
ret = devfreq_register_notifier(devfreq, nb, list);
|
|
if (ret) {
|
|
devres_free(ptr);
|
|
return ret;
|
|
}
|
|
|
|
ptr->devfreq = devfreq;
|
|
ptr->nb = nb;
|
|
ptr->list = list;
|
|
devres_add(dev, ptr);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(devm_devfreq_register_notifier);
|
|
|
|
/**
|
|
* devm_devfreq_unregister_notifier()
|
|
* - Resource-managed devfreq_unregister_notifier()
|
|
* @dev: The devfreq user device. (parent of devfreq)
|
|
* @devfreq: The devfreq object.
|
|
* @nb: The notifier block to be unregistered.
|
|
* @list: DEVFREQ_TRANSITION_NOTIFIER.
|
|
*/
|
|
void devm_devfreq_unregister_notifier(struct device *dev,
|
|
struct devfreq *devfreq,
|
|
struct notifier_block *nb,
|
|
unsigned int list)
|
|
{
|
|
WARN_ON(devres_release(dev, devm_devfreq_notifier_release,
|
|
devm_devfreq_dev_match, devfreq));
|
|
}
|
|
EXPORT_SYMBOL(devm_devfreq_unregister_notifier);
|