From 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:44:59 +0000
Subject: [PATCH] gmac get mac form eeprom
---
kernel/drivers/devfreq/devfreq.c | 991 +++++++++++++++++++++++++++++++++++++++++++---------------
1 files changed, 733 insertions(+), 258 deletions(-)
diff --git a/kernel/drivers/devfreq/devfreq.c b/kernel/drivers/devfreq/devfreq.c
index 87feef9..3ef5a51 100644
--- a/kernel/drivers/devfreq/devfreq.c
+++ b/kernel/drivers/devfreq/devfreq.c
@@ -1,18 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* devfreq: Generic Dynamic Voltage and Frequency Scaling (DVFS) Framework
* for Non-CPU Devices.
*
* Copyright (C) 2011 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/sched.h>
+#include <linux/debugfs.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/init.h>
@@ -27,9 +25,16 @@
#include <linux/printk.h>
#include <linux/hrtimer.h>
#include <linux/of.h>
+#include <linux/pm_qos.h>
#include "governor.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/devfreq.h>
+
+#define HZ_PER_KHZ 1000
+
static struct class *devfreq_class;
+static struct dentry *devfreq_debugfs;
/*
* devfreq core provides delayed work based load monitoring helper
@@ -44,6 +49,11 @@
static LIST_HEAD(devfreq_list);
static DEFINE_MUTEX(devfreq_list_lock);
+static const char timer_name[][DEVFREQ_NAME_LEN] = {
+ [DEVFREQ_TIMER_DEFERRABLE] = { "deferrable" },
+ [DEVFREQ_TIMER_DELAYED] = { "delayed" },
+};
+
/**
* find_device_devfreq() - find devfreq struct using device pointer
* @dev: device pointer used to lookup device devfreq.
@@ -55,12 +65,12 @@
{
struct devfreq *tmp_devfreq;
+ lockdep_assert_held(&devfreq_list_lock);
+
if (IS_ERR_OR_NULL(dev)) {
pr_err("DEVFREQ: %s: Invalid parameters\n", __func__);
return ERR_PTR(-EINVAL);
}
- WARN(!mutex_is_locked(&devfreq_list_lock),
- "devfreq_list_lock must be locked.");
list_for_each_entry(tmp_devfreq, &devfreq_list, node) {
if (tmp_devfreq->dev.parent == dev)
@@ -96,6 +106,54 @@
dev_pm_opp_put(opp);
return max_freq;
+}
+
+/**
+ * get_freq_range() - Get the current freq range
+ * @devfreq: the devfreq instance
+ * @min_freq: the min frequency
+ * @max_freq: the max frequency
+ *
+ * This takes into consideration all constraints.
+ */
+static void get_freq_range(struct devfreq *devfreq,
+ unsigned long *min_freq,
+ unsigned long *max_freq)
+{
+ unsigned long *freq_table = devfreq->profile->freq_table;
+ s32 qos_min_freq, qos_max_freq;
+
+ lockdep_assert_held(&devfreq->lock);
+
+ /*
+ * Initialize minimum/maximum frequency from freq table.
+ * The devfreq drivers can initialize this in either ascending or
+ * descending order and devfreq core supports both.
+ */
+ if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) {
+ *min_freq = freq_table[0];
+ *max_freq = freq_table[devfreq->profile->max_state - 1];
+ } else {
+ *min_freq = freq_table[devfreq->profile->max_state - 1];
+ *max_freq = freq_table[0];
+ }
+
+ /* Apply constraints from PM QoS */
+ qos_min_freq = dev_pm_qos_read_value(devfreq->dev.parent,
+ DEV_PM_QOS_MIN_FREQUENCY);
+ qos_max_freq = dev_pm_qos_read_value(devfreq->dev.parent,
+ DEV_PM_QOS_MAX_FREQUENCY);
+ *min_freq = max(*min_freq, (unsigned long)HZ_PER_KHZ * qos_min_freq);
+ if (qos_max_freq != PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE)
+ *max_freq = min(*max_freq,
+ (unsigned long)HZ_PER_KHZ * qos_max_freq);
+
+ /* Apply constraints from OPP interface */
+ *min_freq = max(*min_freq, devfreq->scaling_min_freq);
+ *max_freq = min(*max_freq, devfreq->scaling_max_freq);
+
+ if (*min_freq > *max_freq)
+ *min_freq = *max_freq;
}
/**
@@ -158,10 +216,10 @@
int devfreq_update_status(struct devfreq *devfreq, unsigned long freq)
{
int lev, prev_lev, ret = 0;
- unsigned long cur_time;
+ u64 cur_time;
lockdep_assert_held(&devfreq->lock);
- cur_time = jiffies;
+ cur_time = get_jiffies_64();
/* Immediately exit if previous_freq is not initialized yet. */
if (!devfreq->previous_freq)
@@ -173,8 +231,8 @@
goto out;
}
- devfreq->time_in_state[prev_lev] +=
- cur_time - devfreq->last_stat_updated;
+ devfreq->stats.time_in_state[prev_lev] +=
+ cur_time - devfreq->stats.last_update;
lev = devfreq_get_freq_level(devfreq, freq);
if (lev < 0) {
@@ -183,13 +241,13 @@
}
if (lev != prev_lev) {
- devfreq->trans_table[(prev_lev *
- devfreq->profile->max_state) + lev]++;
- devfreq->total_trans++;
+ devfreq->stats.trans_table[
+ (prev_lev * devfreq->profile->max_state) + lev]++;
+ devfreq->stats.total_trans++;
}
out:
- devfreq->last_stat_updated = cur_time;
+ devfreq->stats.last_update = cur_time;
return ret;
}
EXPORT_SYMBOL(devfreq_update_status);
@@ -205,12 +263,12 @@
{
struct devfreq_governor *tmp_governor;
+ lockdep_assert_held(&devfreq_list_lock);
+
if (IS_ERR_OR_NULL(name)) {
pr_err("DEVFREQ: %s: Invalid parameters\n", __func__);
return ERR_PTR(-EINVAL);
}
- WARN(!mutex_is_locked(&devfreq_list_lock),
- "devfreq_list_lock must be locked.");
list_for_each_entry(tmp_governor, &devfreq_governor_list, node) {
if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN))
@@ -236,12 +294,12 @@
struct devfreq_governor *governor;
int err = 0;
+ lockdep_assert_held(&devfreq_list_lock);
+
if (IS_ERR_OR_NULL(name)) {
pr_err("DEVFREQ: %s: Invalid parameters\n", __func__);
return ERR_PTR(-EINVAL);
}
- WARN(!mutex_is_locked(&devfreq_list_lock),
- "devfreq_list_lock must be locked.");
governor = find_devfreq_governor(name);
if (IS_ERR(governor)) {
@@ -286,6 +344,44 @@
return 0;
}
+static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
+ u32 flags)
+{
+ struct devfreq_freqs freqs;
+ unsigned long cur_freq;
+ int err = 0;
+
+ if (devfreq->profile->get_cur_freq)
+ devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq);
+ else
+ cur_freq = devfreq->previous_freq;
+
+ freqs.old = cur_freq;
+ freqs.new = new_freq;
+ devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);
+
+ err = devfreq->profile->target(devfreq->dev.parent, &new_freq, flags);
+ if (err) {
+ freqs.new = cur_freq;
+ devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
+ return err;
+ }
+
+ freqs.new = new_freq;
+ devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
+
+ if (devfreq_update_status(devfreq, new_freq))
+ dev_err(&devfreq->dev,
+ "Couldn't update frequency transition information.\n");
+
+ devfreq->previous_freq = new_freq;
+
+ if (devfreq->suspend_freq)
+ devfreq->resume_freq = new_freq;
+
+ return err;
+}
+
/* Load monitoring helper functions for governors use */
/**
@@ -297,39 +393,20 @@
*/
int update_devfreq(struct devfreq *devfreq)
{
- struct devfreq_policy *policy = &devfreq->policy;
- struct devfreq_freqs freqs;
- unsigned long freq, cur_freq, min_freq, max_freq;
+ unsigned long freq, min_freq, max_freq;
int err = 0;
u32 flags = 0;
- if (!mutex_is_locked(&devfreq->lock)) {
- WARN(true, "devfreq->lock must be locked by the caller.\n");
- return -EINVAL;
- }
+ lockdep_assert_held(&devfreq->lock);
if (!devfreq->governor)
return -EINVAL;
-
- policy->max = devfreq->scaling_max_freq;
- policy->min = devfreq->scaling_min_freq;
- srcu_notifier_call_chain(&devfreq->policy_notifier_list, DEVFREQ_ADJUST,
- policy);
/* Reevaluate the proper frequency */
err = devfreq->governor->get_target_freq(devfreq, &freq);
if (err)
return err;
-
- /*
- * Adjust the frequency with user freq, QoS and available freq.
- *
- * List from the highest priority
- * max_freq
- * min_freq
- */
- max_freq = min(policy->max, devfreq->max_freq);
- min_freq = max(policy->min, devfreq->min_freq);
+ get_freq_range(devfreq, &min_freq, &max_freq);
if (freq < min_freq) {
freq = min_freq;
@@ -340,31 +417,8 @@
flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */
}
- if (devfreq->profile->get_cur_freq)
- devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq);
- else
- cur_freq = devfreq->previous_freq;
+ return devfreq_set_target(devfreq, freq, flags);
- freqs.old = cur_freq;
- freqs.new = freq;
- devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);
-
- err = devfreq->profile->target(devfreq->dev.parent, &freq, flags);
- if (err) {
- freqs.new = cur_freq;
- devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
- return err;
- }
-
- freqs.new = freq;
- devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
-
- if (devfreq_update_status(devfreq, freq))
- dev_err(&devfreq->dev,
- "Couldn't update frequency transition information.\n");
-
- devfreq->previous_freq = freq;
- return err;
}
EXPORT_SYMBOL(update_devfreq);
@@ -387,20 +441,35 @@
queue_delayed_work(devfreq_wq, &devfreq->work,
msecs_to_jiffies(devfreq->profile->polling_ms));
mutex_unlock(&devfreq->lock);
+
+ trace_devfreq_monitor(devfreq);
}
/**
* devfreq_monitor_start() - Start load monitoring of devfreq instance
* @devfreq: the devfreq instance.
*
- * Helper function for starting devfreq device load monitoing. By
+ * Helper function for starting devfreq device load monitoring. By
* default delayed work based monitoring is supported. Function
* to be called from governor in response to DEVFREQ_GOV_START
* event when device is added to devfreq framework.
*/
void devfreq_monitor_start(struct devfreq *devfreq)
{
- INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor);
+ if (devfreq->governor->interrupt_driven)
+ return;
+
+ switch (devfreq->profile->timer) {
+ case DEVFREQ_TIMER_DEFERRABLE:
+ INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor);
+ break;
+ case DEVFREQ_TIMER_DELAYED:
+ INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor);
+ break;
+ default:
+ return;
+ }
+
if (devfreq->profile->polling_ms)
queue_delayed_work(devfreq_wq, &devfreq->work,
msecs_to_jiffies(devfreq->profile->polling_ms));
@@ -411,12 +480,15 @@
* devfreq_monitor_stop() - Stop load monitoring of a devfreq instance
* @devfreq: the devfreq instance.
*
- * Helper function to stop devfreq device load monitoing. Function
+ * 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 (devfreq->governor->interrupt_driven)
+ return;
+
cancel_delayed_work_sync(&devfreq->work);
}
EXPORT_SYMBOL(devfreq_monitor_stop);
@@ -425,7 +497,7 @@
* devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance
* @devfreq: the devfreq instance.
*
- * Helper function to suspend devfreq device load monitoing. Function
+ * 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.
*
@@ -444,6 +516,10 @@
devfreq_update_status(devfreq, devfreq->previous_freq);
devfreq->stop_polling = true;
mutex_unlock(&devfreq->lock);
+
+ if (devfreq->governor->interrupt_driven)
+ return;
+
cancel_delayed_work_sync(&devfreq->work);
}
EXPORT_SYMBOL(devfreq_monitor_suspend);
@@ -452,7 +528,7 @@
* devfreq_monitor_resume() - Resume load monitoring of a devfreq instance
* @devfreq: the devfreq instance.
*
- * Helper function to resume devfreq device load monitoing. Function
+ * 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.
*/
@@ -464,12 +540,16 @@
if (!devfreq->stop_polling)
goto out;
+ if (devfreq->governor->interrupt_driven)
+ goto out_update;
+
if (!delayed_work_pending(&devfreq->work) &&
devfreq->profile->polling_ms)
queue_delayed_work(devfreq_wq, &devfreq->work,
msecs_to_jiffies(devfreq->profile->polling_ms));
- devfreq->last_stat_updated = jiffies;
+out_update:
+ devfreq->stats.last_update = get_jiffies_64();
devfreq->stop_polling = false;
if (devfreq->profile->get_cur_freq &&
@@ -482,14 +562,14 @@
EXPORT_SYMBOL(devfreq_monitor_resume);
/**
- * devfreq_interval_update() - Update device devfreq monitoring interval
+ * 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_INTERVAL event.
+ * to be called from governor in response to DEVFREQ_GOV_UPDATE_INTERVAL event.
*/
-void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay)
+void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay)
{
unsigned int cur_delay = devfreq->profile->polling_ms;
unsigned int new_delay = *delay;
@@ -498,6 +578,9 @@
devfreq->profile->polling_ms = new_delay;
if (devfreq->stop_polling)
+ goto out;
+
+ if (devfreq->governor->interrupt_driven)
goto out;
/* if new delay is zero, stop polling */
@@ -521,16 +604,16 @@
mutex_lock(&devfreq->lock);
if (!devfreq->stop_polling)
queue_delayed_work(devfreq_wq, &devfreq->work,
- msecs_to_jiffies(devfreq->profile->polling_ms));
+ msecs_to_jiffies(devfreq->profile->polling_ms));
}
out:
mutex_unlock(&devfreq->lock);
}
-EXPORT_SYMBOL(devfreq_interval_update);
+EXPORT_SYMBOL(devfreq_update_interval);
/**
* devfreq_notifier_call() - Notify that the device frequency requirements
- * has been changed out of devfreq framework.
+ * has been changed out of devfreq framework.
* @nb: the notifier_block (supposed to be devfreq->nb)
* @type: not used
* @devp: not used
@@ -546,6 +629,8 @@
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) {
@@ -566,6 +651,45 @@
}
/**
+ * 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
*
@@ -574,16 +698,41 @@
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);
mutex_destroy(&devfreq->lock);
- mutex_destroy(&devfreq->event_lock);
+ srcu_cleanup_notifier_head(&devfreq->transition_notifier_list);
kfree(devfreq);
}
@@ -613,7 +762,7 @@
devfreq = find_device_devfreq(dev);
mutex_unlock(&devfreq_list_lock);
if (!IS_ERR(devfreq)) {
- dev_err(dev, "%s: Unable to create devfreq for the device.\n",
+ dev_err(dev, "%s: devfreq device already exists!\n",
__func__);
err = -EINVAL;
goto err_out;
@@ -626,30 +775,39 @@
}
mutex_init(&devfreq->lock);
- mutex_init(&devfreq->event_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;
- strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN);
+ strscpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN);
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_out;
+ goto err_dev;
mutex_lock(&devfreq->lock);
}
devfreq->scaling_min_freq = find_available_min_freq(devfreq);
- devfreq->min_freq = devfreq->scaling_min_freq;
- devfreq->policy.min = devfreq->min_freq;
+ 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) {
@@ -657,8 +815,9 @@
err = -EINVAL;
goto err_dev;
}
- devfreq->max_freq = devfreq->scaling_max_freq;
- devfreq->policy.max = devfreq->max_freq;
+
+ devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev);
+ atomic_set(&devfreq->suspend_count, 0);
dev_set_name(&devfreq->dev, "%s", dev_name(dev));
err = device_register(&devfreq->dev);
@@ -668,22 +827,55 @@
goto err_out;
}
- devfreq->trans_table =
- devm_kzalloc(&devfreq->dev,
- array3_size(sizeof(unsigned int),
- devfreq->profile->max_state,
- devfreq->profile->max_state),
- GFP_KERNEL);
- devfreq->time_in_state = devm_kcalloc(&devfreq->dev,
- devfreq->profile->max_state,
- sizeof(unsigned long),
- GFP_KERNEL);
- devfreq->last_stat_updated = jiffies;
+ 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);
- srcu_init_notifier_head(&devfreq->policy_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(devfreq->dev.parent, &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(devfreq->dev.parent, &devfreq->nb_max,
+ DEV_PM_QOS_MAX_FREQUENCY);
+ if (err)
+ goto err_devfreq;
mutex_lock(&devfreq_list_lock);
@@ -712,12 +904,11 @@
err_init:
mutex_unlock(&devfreq_list_lock);
-
+err_devfreq:
devfreq_remove_device(devfreq);
devfreq = NULL;
err_dev:
- if (devfreq)
- kfree(devfreq);
+ kfree(devfreq);
err_out:
return ERR_PTR(err);
}
@@ -796,52 +987,79 @@
#ifdef CONFIG_OF
/*
- * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree
- * @dev - instance to the given device
- * @index - index into list of devfreq
+ * 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_phandle(struct device *dev, int index)
+struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)
{
- struct device_node *node;
struct devfreq *devfreq;
- if (!dev)
- return ERR_PTR(-EINVAL);
-
- if (!dev->of_node)
- return ERR_PTR(-EINVAL);
-
- node = of_parse_phandle(dev->of_node, "devfreq", index);
if (!node)
- return ERR_PTR(-ENODEV);
+ 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);
- of_node_put(node);
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 ERR_PTR(-EPROBE_DEFER);
+ return devfreq;
}
+
#else
-struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)
+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 to add devfreq feature.
+ * @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)
@@ -866,14 +1084,25 @@
if (!devfreq)
return -EINVAL;
- if (!devfreq->governor)
+ if (atomic_inc_return(&devfreq->suspend_count) > 1)
return 0;
- mutex_lock(&devfreq->event_lock);
- ret = devfreq->governor->event_handler(devfreq,
- DEVFREQ_GOV_SUSPEND, NULL);
- mutex_unlock(&devfreq->event_lock);
- return ret;
+ 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);
@@ -888,19 +1117,75 @@
int devfreq_resume_device(struct devfreq *devfreq)
{
int ret;
+
if (!devfreq)
return -EINVAL;
- if (!devfreq->governor)
+ if (atomic_dec_return(&devfreq->suspend_count) >= 1)
return 0;
- mutex_lock(&devfreq->event_lock);
- ret = devfreq->governor->event_handler(devfreq,
- DEVFREQ_GOV_RESUME, NULL);
- mutex_unlock(&devfreq->event_lock);
- return ret;
+ 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
@@ -1025,18 +1310,20 @@
static ssize_t name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct devfreq *devfreq = to_devfreq(dev);
- return sprintf(buf, "%s\n", dev_name(devfreq->dev.parent));
+ 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)
{
- if (!to_devfreq(dev)->governor)
+ struct devfreq *df = to_devfreq(dev);
+
+ if (!df->governor)
return -EINVAL;
- return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name);
+ return sprintf(buf, "%s\n", df->governor->name);
}
static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
@@ -1045,7 +1332,10 @@
struct devfreq *df = to_devfreq(dev);
int ret;
char str_governor[DEVFREQ_NAME_LEN + 1];
- const struct devfreq_governor *governor, *prev_gov;
+ 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)
@@ -1060,39 +1350,36 @@
if (df->governor == governor) {
ret = 0;
goto out;
- } else if ((df->governor && df->governor->immutable) ||
- governor->immutable) {
+ } else if (df->governor->immutable || governor->immutable) {
ret = -EINVAL;
goto out;
}
- mutex_lock(&df->event_lock);
- if (df->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 gov_stop_out;
- }
+ 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;
}
- prev_gov = df->governor;
+
+ prev_governor = df->governor;
df->governor = governor;
strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN);
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);
- if (prev_gov) {
- df->governor = prev_gov;
- strlcpy(df->governor_name, prev_gov->name,
- DEVFREQ_NAME_LEN);
- df->governor->event_handler(df, DEVFREQ_GOV_START,
- NULL);
+ df->governor = prev_governor;
+ strncpy(df->governor_name, prev_governor->name,
+ DEVFREQ_NAME_LEN);
+ ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
+ if (ret) {
+ dev_err(dev,
+ "%s: reverting to Governor %s failed (%d)\n",
+ __func__, df->governor_name, ret);
+ df->governor = NULL;
}
}
-
-gov_stop_out:
- mutex_unlock(&df->event_lock);
out:
mutex_unlock(&devfreq_list_lock);
@@ -1109,15 +1396,18 @@
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 (df->governor && df->governor->immutable) {
+ if (df->governor->immutable) {
count = scnprintf(&buf[count], DEVFREQ_NAME_LEN,
- "%s ", df->governor_name);
+ "%s ", df->governor_name);
/*
* The devfreq device shows the registered governor except for
* immutable governors such as passive governor .
@@ -1149,27 +1439,37 @@
char *buf)
{
unsigned long freq;
- struct devfreq *devfreq = to_devfreq(dev);
+ struct devfreq *df = to_devfreq(dev);
- if (devfreq->profile->get_cur_freq &&
- !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq))
+ 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", devfreq->previous_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)
{
- return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq);
+ struct devfreq *df = to_devfreq(dev);
+
+ return sprintf(buf, "%lu\n", df->previous_freq);
}
static DEVICE_ATTR_RO(target_freq);
static ssize_t polling_interval_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms);
+ 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,
@@ -1187,10 +1487,8 @@
if (ret != 1)
return -EINVAL;
- mutex_lock(&df->event_lock);
- df->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value);
+ df->governor->event_handler(df, DEVFREQ_GOV_UPDATE_INTERVAL, &value);
ret = count;
- mutex_unlock(&df->event_lock);
return ret;
}
@@ -1203,44 +1501,39 @@
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;
- mutex_lock(&df->event_lock);
- mutex_lock(&df->lock);
+ /* 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;
- if (value) {
- if (value > df->max_freq) {
- ret = -EINVAL;
- goto unlock;
- }
- } else {
- unsigned long *freq_table = df->profile->freq_table;
-
- /* Get minimum frequency according to sorting order */
- if (freq_table[0] < freq_table[df->profile->max_state - 1])
- value = freq_table[0];
- else
- value = freq_table[df->profile->max_state - 1];
- }
-
- df->min_freq = value;
- update_devfreq(df);
- ret = count;
-unlock:
- mutex_unlock(&df->lock);
- mutex_unlock(&df->event_lock);
- 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;
- return sprintf(buf, "%lu\n", max(df->policy.min, df->min_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)
@@ -1249,44 +1542,50 @@
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;
- mutex_lock(&df->event_lock);
- mutex_lock(&df->lock);
+ /*
+ * 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;
- if (value) {
- if (value < df->min_freq) {
- ret = -EINVAL;
- goto unlock;
- }
- } else {
- unsigned long *freq_table = df->profile->freq_table;
+ ret = dev_pm_qos_update_request(&df->user_max_freq_req, value);
+ if (ret < 0)
+ return ret;
- /* Get maximum frequency according to sorting order */
- if (freq_table[0] < freq_table[df->profile->max_state - 1])
- value = freq_table[df->profile->max_state - 1];
- else
- value = freq_table[0];
- }
-
- df->max_freq = value;
- update_devfreq(df);
- ret = count;
-unlock:
- mutex_unlock(&df->lock);
- mutex_unlock(&df->event_lock);
- return ret;
+ return count;
}
-static DEVICE_ATTR_RW(min_freq);
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;
- return sprintf(buf, "%lu\n", min(df->policy.max, df->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);
@@ -1297,6 +1596,9 @@
struct devfreq *df = to_devfreq(d);
ssize_t count = 0;
int i;
+
+ if (!df->profile)
+ return -EINVAL;
mutex_lock(&df->lock);
@@ -1318,51 +1620,149 @@
static ssize_t trans_stat_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct devfreq *devfreq = to_devfreq(dev);
+ struct devfreq *df = to_devfreq(dev);
ssize_t len;
int i, j;
- unsigned int max_state = devfreq->profile->max_state;
+ 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(&devfreq->lock);
- if (!devfreq->stop_polling &&
- devfreq_update_status(devfreq, devfreq->previous_freq)) {
- mutex_unlock(&devfreq->lock);
+ mutex_lock(&df->lock);
+ if (!df->stop_polling &&
+ devfreq_update_status(df, df->previous_freq)) {
+ mutex_unlock(&df->lock);
return 0;
}
- mutex_unlock(&devfreq->lock);
+ 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",
- devfreq->profile->freq_table[i]);
+ df->profile->freq_table[i]);
len += sprintf(buf + len, " time(ms)\n");
for (i = 0; i < max_state; i++) {
- if (devfreq->profile->freq_table[i]
- == devfreq->previous_freq) {
+ if (df->profile->freq_table[i]
+ == df->previous_freq) {
len += sprintf(buf + len, "*");
} else {
len += sprintf(buf + len, " ");
}
len += sprintf(buf + len, "%10lu:",
- devfreq->profile->freq_table[i]);
+ df->profile->freq_table[i]);
for (j = 0; j < max_state; j++)
len += sprintf(buf + len, "%10u",
- devfreq->trans_table[(i * max_state) + j]);
- len += sprintf(buf + len, "%10u\n",
- jiffies_to_msecs(devfreq->time_in_state[i]));
+ 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",
- devfreq->total_trans);
+ df->stats.total_trans);
return len;
}
-static DEVICE_ATTR_RO(trans_stat);
+
+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 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);
static ssize_t load_show(struct device *dev, struct device_attribute *attr,
char *buf)
@@ -1389,8 +1789,8 @@
len = sprintf(buf, "%lu", stat.busy_time * 100 / stat.total_time);
if (devfreq->profile->get_cur_freq &&
- !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq))
- len += sprintf(buf + len, "@%luHz\n", freq);
+ !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq))
+ len += sprintf(buf + len, "@%luHz\n", freq);
else
len += sprintf(buf + len, "@%luHz\n", devfreq->previous_freq);
@@ -1409,10 +1809,88 @@
&dev_attr_min_freq.attr,
&dev_attr_max_freq.attr,
&dev_attr_trans_stat.attr,
+ &dev_attr_timer.attr,
&dev_attr_load.attr,
NULL,
};
ATTRIBUTE_GROUPS(devfreq);
+
+/**
+ * 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);
+ polling_ms = devfreq->profile->polling_ms;
+ timer = devfreq->profile->timer;
+ 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)
{
@@ -1429,6 +1907,11 @@
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;
}
@@ -1477,8 +1960,8 @@
/**
* devfreq_register_opp_notifier() - Helper function to get devfreq notified
- * for any changes in the OPP availability
- * changes
+ * for any changes in the OPP availability
+ * changes
* @dev: The devfreq user device. (parent of devfreq)
* @devfreq: The devfreq object.
*/
@@ -1490,8 +1973,8 @@
/**
* devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq
- * notified for any changes in the OPP
- * availability changes anymore.
+ * notified for any changes in the OPP
+ * availability changes anymore.
* @dev: The devfreq user device. (parent of devfreq)
* @devfreq: The devfreq object.
*
@@ -1510,8 +1993,8 @@
}
/**
- * devm_ devfreq_register_opp_notifier()
- * - Resource-managed devfreq_register_opp_notifier()
+ * devm_devfreq_register_opp_notifier() - Resource-managed
+ * devfreq_register_opp_notifier()
* @dev: The devfreq user device. (parent of devfreq)
* @devfreq: The devfreq object.
*/
@@ -1539,8 +2022,8 @@
EXPORT_SYMBOL(devm_devfreq_register_opp_notifier);
/**
- * devm_devfreq_unregister_opp_notifier()
- * - Resource-managed devfreq_unregister_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.
*/
@@ -1556,11 +2039,11 @@
* devfreq_register_notifier() - Register a driver with devfreq
* @devfreq: The devfreq object.
* @nb: The notifier block to register.
- * @list: DEVFREQ_TRANSITION_NOTIFIER or DEVFREQ_POLICY_NOTIFIER.
+ * @list: DEVFREQ_TRANSITION_NOTIFIER.
*/
int devfreq_register_notifier(struct devfreq *devfreq,
- struct notifier_block *nb,
- unsigned int list)
+ struct notifier_block *nb,
+ unsigned int list)
{
int ret = 0;
@@ -1571,10 +2054,6 @@
case DEVFREQ_TRANSITION_NOTIFIER:
ret = srcu_notifier_chain_register(
&devfreq->transition_notifier_list, nb);
- break;
- case DEVFREQ_POLICY_NOTIFIER:
- ret = srcu_notifier_chain_register(
- &devfreq->policy_notifier_list, nb);
break;
default:
ret = -EINVAL;
@@ -1588,7 +2067,7 @@
* devfreq_unregister_notifier() - Unregister a driver with devfreq
* @devfreq: The devfreq object.
* @nb: The notifier block to be unregistered.
- * @list: DEVFREQ_TRANSITION_NOTIFIER or DEVFREQ_POLICY_NOTIFIER.
+ * @list: DEVFREQ_TRANSITION_NOTIFIER.
*/
int devfreq_unregister_notifier(struct devfreq *devfreq,
struct notifier_block *nb,
@@ -1603,10 +2082,6 @@
case DEVFREQ_TRANSITION_NOTIFIER:
ret = srcu_notifier_chain_unregister(
&devfreq->transition_notifier_list, nb);
- break;
- case DEVFREQ_POLICY_NOTIFIER:
- ret = srcu_notifier_chain_unregister(
- &devfreq->policy_notifier_list, nb);
break;
default:
ret = -EINVAL;
@@ -1631,7 +2106,7 @@
/**
* devm_devfreq_register_notifier()
- - Resource-managed 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.
@@ -1667,16 +2142,16 @@
/**
* devm_devfreq_unregister_notifier()
- - Resource-managed 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)
+ struct devfreq *devfreq,
+ struct notifier_block *nb,
+ unsigned int list)
{
WARN_ON(devres_release(dev, devm_devfreq_notifier_release,
devm_devfreq_dev_match, devfreq));
--
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