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2213 lines
56 KiB
2213 lines
56 KiB
// 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 <[email protected]> |
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*/ |
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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/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 "governor.h" |
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|
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#define CREATE_TRACE_POINTS |
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#include <trace/events/devfreq.h> |
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|
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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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#define HZ_PER_KHZ 1000 |
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|
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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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/* |
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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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|
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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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|
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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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/** |
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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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|
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lockdep_assert_held(&devfreq_list_lock); |
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|
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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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|
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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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|
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return ERR_PTR(-ENODEV); |
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} |
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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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|
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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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|
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return min_freq; |
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} |
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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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|
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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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|
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return max_freq; |
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} |
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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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|
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lockdep_assert_held(&devfreq->lock); |
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|
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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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|
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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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|
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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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/** |
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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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|
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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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|
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return -EINVAL; |
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} |
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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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|
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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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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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lockdep_assert_held(&devfreq->lock); |
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cur_time = get_jiffies_64(); |
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|
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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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|
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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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|
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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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/** |
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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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|
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return ERR_PTR(-ENODEV); |
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} |
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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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|
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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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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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/* |
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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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|
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freqs.new = new_freq; |
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devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); |
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|
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if (devfreq_update_status(devfreq, new_freq)) |
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dev_err(&devfreq->dev, |
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"Couldn't update frequency transition information.\n"); |
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|
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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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|
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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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|
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if (!devfreq->governor) |
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return -EINVAL; |
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|
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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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|
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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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|
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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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/** |
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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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if (devfreq->profile->polling_ms) |
|
queue_delayed_work(devfreq_wq, &devfreq->work, |
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msecs_to_jiffies(devfreq->profile->polling_ms)); |
|
} |
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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 |
|
* @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. |
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*/ |
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void devfreq_monitor_stop(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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cancel_delayed_work_sync(&devfreq->work); |
|
} |
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EXPORT_SYMBOL(devfreq_monitor_stop); |
|
|
|
/** |
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* 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. |
|
*/ |
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void devfreq_monitor_suspend(struct devfreq *devfreq) |
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{ |
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mutex_lock(&devfreq->lock); |
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if (devfreq->stop_polling) { |
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mutex_unlock(&devfreq->lock); |
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return; |
|
} |
|
|
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devfreq_update_status(devfreq, devfreq->previous_freq); |
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devfreq->stop_polling = true; |
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mutex_unlock(&devfreq->lock); |
|
|
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if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) |
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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; |
|
|
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if (!devfreq->stop_polling) |
|
goto out; |
|
|
|
if (!delayed_work_pending(&devfreq->work) && |
|
devfreq->profile->polling_ms) |
|
queue_delayed_work(devfreq_wq, &devfreq->work, |
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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); |
|
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); |
|
|
|
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; |
|
|
|
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); |
|
|
|
/** |
|
* 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);
|
|
|