[PATCH v4 04/12] PM / devfreq: Add struct devfreq_policy

From: Matthias Kaehlcke
Date: Wed Jun 20 2018 - 21:53:27 EST

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Previous message: Matthias Kaehlcke: "[PATCH v4 05/12] PM / devfreq: Add support for policy notifiers"
In reply to: Matthias Kaehlcke: "[PATCH v4 05/12] PM / devfreq: Add support for policy notifiers"
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Move variables related with devfreq policy changes from struct devfreq
to the new struct devfreq_policy and add a policy field to struct devfreq.

The following variables are moved:

df->min/max_freq => p->user.min/max_freq
df->scaling_min/max_freq => p->devinfo.min/max_freq
df->governor => p->governor
df->governor_name => p->governor_name

Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Reviewed-by: Brian Norris <briannorris@xxxxxxxxxxxx>
---
Changes in v4:
- added 'Reviewed-by: Brian Norris <briannorris@xxxxxxxxxxxx>' tag

Changes in v3:
- none

Changes in v2:
- performance, powersave and simpleondemand governors don't need changes
with "PM / devfreq: Don't adjust to user limits in governors"
- formatting fixes
---
drivers/devfreq/devfreq.c | 137 ++++++++++++++++-------------
drivers/devfreq/governor_passive.c | 4 +-
include/linux/devfreq.h | 38 +++++---
3 files changed, 103 insertions(+), 76 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 6f604f8b2b81..21604d6ae2b8 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -255,6 +255,7 @@ static int devfreq_notify_transition(struct devfreq *devfreq,
*/
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;
int err = 0;
@@ -265,11 +266,11 @@ int update_devfreq(struct devfreq *devfreq)
return -EINVAL;
}

- if (!devfreq->governor)
+ if (!policy->governor)
return -EINVAL;

/* Reevaluate the proper frequency */
- err = devfreq->governor->get_target_freq(devfreq, &freq);
+ err = policy->governor->get_target_freq(devfreq, &freq);
if (err)
return err;

@@ -280,8 +281,8 @@ int update_devfreq(struct devfreq *devfreq)
* max_freq
* min_freq
*/
- max_freq = MIN(devfreq->scaling_max_freq, devfreq->max_freq);
- min_freq = MAX(devfreq->scaling_min_freq, devfreq->min_freq);
+ max_freq = MIN(policy->devinfo.max_freq, policy->user.max_freq);
+ min_freq = MAX(policy->devinfo.min_freq, policy->user.min_freq);

if (freq < min_freq) {
freq = min_freq;
@@ -493,18 +494,19 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type,
void *devp)
{
struct devfreq *devfreq = container_of(nb, struct devfreq, nb);
+ struct devfreq_policy *policy = &devfreq->policy;
int ret;

mutex_lock(&devfreq->lock);

- devfreq->scaling_min_freq = find_available_min_freq(devfreq);
- if (!devfreq->scaling_min_freq) {
+ policy->devinfo.min_freq = find_available_min_freq(devfreq);
+ if (!policy->devinfo.min_freq) {
mutex_unlock(&devfreq->lock);
return -EINVAL;
}

- devfreq->scaling_max_freq = find_available_max_freq(devfreq);
- if (!devfreq->scaling_max_freq) {
+ policy->devinfo.max_freq = find_available_max_freq(devfreq);
+ if (!policy->devinfo.max_freq) {
mutex_unlock(&devfreq->lock);
return -EINVAL;
}
@@ -524,6 +526,7 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type,
static void devfreq_dev_release(struct device *dev)
{
struct devfreq *devfreq = to_devfreq(dev);
+ struct devfreq_policy *policy = &devfreq->policy;

mutex_lock(&devfreq_list_lock);
if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) {
@@ -534,9 +537,9 @@ static void devfreq_dev_release(struct device *dev)
list_del(&devfreq->node);
mutex_unlock(&devfreq_list_lock);

- if (devfreq->governor)
- devfreq->governor->event_handler(devfreq,
- DEVFREQ_GOV_STOP, NULL);
+ if (policy->governor)
+ policy->governor->event_handler(devfreq,
+ DEVFREQ_GOV_STOP, NULL);

if (devfreq->profile->exit)
devfreq->profile->exit(devfreq->dev.parent);
@@ -559,6 +562,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
void *data)
{
struct devfreq *devfreq;
+ struct devfreq_policy *policy;
struct devfreq_governor *governor;
static atomic_t devfreq_no = ATOMIC_INIT(-1);
int err = 0;
@@ -584,13 +588,14 @@ struct devfreq *devfreq_add_device(struct device *dev,
goto err_out;
}

+ policy = &devfreq->policy;
mutex_init(&devfreq->lock);
mutex_lock(&devfreq->lock);
devfreq->dev.parent = dev;
devfreq->dev.class = devfreq_class;
devfreq->dev.release = devfreq_dev_release;
devfreq->profile = profile;
- strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN);
+ strncpy(policy->governor_name, governor_name, DEVFREQ_NAME_LEN);
devfreq->previous_freq = profile->initial_freq;
devfreq->last_status.current_frequency = profile->initial_freq;
devfreq->data = data;
@@ -604,21 +609,21 @@ struct devfreq *devfreq_add_device(struct device *dev,
mutex_lock(&devfreq->lock);
}

- devfreq->scaling_min_freq = find_available_min_freq(devfreq);
- if (!devfreq->scaling_min_freq) {
+ policy->devinfo.min_freq = find_available_min_freq(devfreq);
+ if (!policy->devinfo.min_freq) {
mutex_unlock(&devfreq->lock);
err = -EINVAL;
goto err_dev;
}
- devfreq->min_freq = devfreq->scaling_min_freq;
+ policy->user.min_freq = policy->devinfo.min_freq;

- devfreq->scaling_max_freq = find_available_max_freq(devfreq);
- if (!devfreq->scaling_max_freq) {
+ policy->devinfo.max_freq = find_available_max_freq(devfreq);
+ if (!policy->devinfo.max_freq) {
mutex_unlock(&devfreq->lock);
err = -EINVAL;
goto err_dev;
}
- devfreq->max_freq = devfreq->scaling_max_freq;
+ policy->user.max_freq = policy->devinfo.max_freq;

dev_set_name(&devfreq->dev, "devfreq%d",
atomic_inc_return(&devfreq_no));
@@ -646,7 +651,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
mutex_lock(&devfreq_list_lock);
list_add(&devfreq->node, &devfreq_list);

- governor = find_devfreq_governor(devfreq->governor_name);
+ governor = find_devfreq_governor(policy->governor_name);
if (IS_ERR(governor)) {
dev_err(dev, "%s: Unable to find governor for the device\n",
__func__);
@@ -654,9 +659,9 @@ struct devfreq *devfreq_add_device(struct device *dev,
goto err_init;
}

- devfreq->governor = governor;
- err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START,
- NULL);
+ policy->governor = governor;
+ err = policy->governor->event_handler(devfreq, DEVFREQ_GOV_START,
+ NULL);
if (err) {
dev_err(dev, "%s: Unable to start governor for the device\n",
__func__);
@@ -817,10 +822,10 @@ int devfreq_suspend_device(struct devfreq *devfreq)
if (!devfreq)
return -EINVAL;

- if (!devfreq->governor)
+ if (!devfreq->policy.governor)
return 0;

- return devfreq->governor->event_handler(devfreq,
+ return devfreq->policy.governor->event_handler(devfreq,
DEVFREQ_GOV_SUSPEND, NULL);
}
EXPORT_SYMBOL(devfreq_suspend_device);
@@ -838,10 +843,10 @@ int devfreq_resume_device(struct devfreq *devfreq)
if (!devfreq)
return -EINVAL;

- if (!devfreq->governor)
+ if (!devfreq->policy.governor)
return 0;

- return devfreq->governor->event_handler(devfreq,
+ return devfreq->policy.governor->event_handler(devfreq,
DEVFREQ_GOV_RESUME, NULL);
}
EXPORT_SYMBOL(devfreq_resume_device);
@@ -875,30 +880,31 @@ int devfreq_add_governor(struct devfreq_governor *governor)
list_for_each_entry(devfreq, &devfreq_list, node) {
int ret = 0;
struct device *dev = devfreq->dev.parent;
+ struct devfreq_policy *policy = &devfreq->policy;

- if (!strncmp(devfreq->governor_name, governor->name,
+ if (!strncmp(policy->governor_name, governor->name,
DEVFREQ_NAME_LEN)) {
/* The following should never occur */
- if (devfreq->governor) {
+ if (policy->governor) {
dev_warn(dev,
"%s: Governor %s already present\n",
- __func__, devfreq->governor->name);
- ret = devfreq->governor->event_handler(devfreq,
+ __func__, policy->governor->name);
+ ret = policy->governor->event_handler(devfreq,
DEVFREQ_GOV_STOP, NULL);
if (ret) {
dev_warn(dev,
"%s: Governor %s stop = %d\n",
__func__,
- devfreq->governor->name, ret);
+ policy->governor->name, ret);
}
/* Fall through */
}
- devfreq->governor = governor;
- ret = devfreq->governor->event_handler(devfreq,
+ policy->governor = governor;
+ ret = policy->governor->event_handler(devfreq,
DEVFREQ_GOV_START, NULL);
if (ret) {
dev_warn(dev, "%s: Governor %s start=%d\n",
- __func__, devfreq->governor->name,
+ __func__, policy->governor->name,
ret);
}
}
@@ -937,24 +943,25 @@ int devfreq_remove_governor(struct devfreq_governor *governor)
list_for_each_entry(devfreq, &devfreq_list, node) {
int ret;
struct device *dev = devfreq->dev.parent;
+ struct devfreq_policy *policy = &devfreq->policy;

- if (!strncmp(devfreq->governor_name, governor->name,
+ if (!strncmp(policy->governor_name, governor->name,
DEVFREQ_NAME_LEN)) {
/* we should have a devfreq governor! */
- if (!devfreq->governor) {
+ if (!policy->governor) {
dev_warn(dev, "%s: Governor %s NOT present\n",
__func__, governor->name);
continue;
/* Fall through */
}
- ret = devfreq->governor->event_handler(devfreq,
+ ret = policy->governor->event_handler(devfreq,
DEVFREQ_GOV_STOP, NULL);
if (ret) {
dev_warn(dev, "%s: Governor %s stop=%d\n",
- __func__, devfreq->governor->name,
+ __func__, policy->governor->name,
ret);
}
- devfreq->governor = NULL;
+ policy->governor = NULL;
}
}

@@ -969,16 +976,17 @@ EXPORT_SYMBOL(devfreq_remove_governor);
static ssize_t governor_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- if (!to_devfreq(dev)->governor)
+ if (!to_devfreq(dev)->policy.governor)
return -EINVAL;

- return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name);
+ return sprintf(buf, "%s\n", to_devfreq(dev)->policy.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);
+ struct devfreq_policy *policy = &df->policy;
int ret;
char str_governor[DEVFREQ_NAME_LEN + 1];
struct devfreq_governor *governor;
@@ -993,29 +1001,30 @@ static ssize_t governor_store(struct device *dev, struct device_attribute *attr,
ret = PTR_ERR(governor);
goto out;
}
- if (df->governor == governor) {
+ if (policy->governor == governor) {
ret = 0;
goto out;
- } else if ((df->governor && df->governor->immutable) ||
+ } else if ((policy->governor && policy->governor->immutable) ||
governor->immutable) {
ret = -EINVAL;
goto out;
}

- if (df->governor) {
- ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL);
+ if (policy->governor) {
+ ret = policy->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);
+ __func__, policy->governor->name, ret);
goto out;
}
}
- df->governor = governor;
- strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN);
- ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
+ policy->governor = governor;
+ strncpy(policy->governor_name, governor->name, DEVFREQ_NAME_LEN);
+ ret = policy->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);
+ __func__, policy->governor->name, ret);
out:
mutex_unlock(&devfreq_list_lock);

@@ -1030,6 +1039,7 @@ static ssize_t available_governors_show(struct device *d,
char *buf)
{
struct devfreq *df = to_devfreq(d);
+ struct devfreq_policy *policy = &df->policy;
ssize_t count = 0;

mutex_lock(&devfreq_list_lock);
@@ -1038,9 +1048,9 @@ static ssize_t available_governors_show(struct device *d,
* The devfreq with immutable governor (e.g., passive) shows
* only own governor.
*/
- if (df->governor->immutable) {
+ if (policy->governor->immutable) {
count = scnprintf(&buf[count], DEVFREQ_NAME_LEN,
- "%s ", df->governor_name);
+ "%s ", policy->governor_name);
/*
* The devfreq device shows the registered governor except for
* immutable governors such as passive governor .
@@ -1100,17 +1110,18 @@ static ssize_t polling_interval_store(struct device *dev,
const char *buf, size_t count)
{
struct devfreq *df = to_devfreq(dev);
+ struct devfreq_policy *policy = &df->policy;
unsigned int value;
int ret;

- if (!df->governor)
+ if (!policy->governor)
return -EINVAL;

ret = sscanf(buf, "%u", &value);
if (ret != 1)
return -EINVAL;

- df->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value);
+ policy->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value);
ret = count;

return ret;
@@ -1132,7 +1143,7 @@ static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr,
mutex_lock(&df->lock);

if (value) {
- if (value > df->max_freq) {
+ if (value > df->policy.user.max_freq) {
ret = -EINVAL;
goto unlock;
}
@@ -1145,7 +1156,7 @@ static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr,
value = freq_table[df->profile->max_state - 1];
}

- df->min_freq = value;
+ df->policy.user.min_freq = value;
update_devfreq(df);
ret = count;
unlock:
@@ -1156,9 +1167,10 @@ static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr,
static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
- struct devfreq *df = to_devfreq(dev);
+ struct devfreq_policy *policy = &to_devfreq(dev)->policy;

- return sprintf(buf, "%lu\n", MAX(df->scaling_min_freq, df->min_freq));
+ return sprintf(buf, "%lu\n",
+ MAX(policy->devinfo.min_freq, policy->user.min_freq));
}

static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr,
@@ -1176,7 +1188,7 @@ static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr,
mutex_lock(&df->lock);

if (value) {
- if (value < df->min_freq) {
+ if (value < df->policy.user.min_freq) {
ret = -EINVAL;
goto unlock;
}
@@ -1189,7 +1201,7 @@ static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr,
value = freq_table[0];
}

- df->max_freq = value;
+ df->policy.user.max_freq = value;
update_devfreq(df);
ret = count;
unlock:
@@ -1201,9 +1213,10 @@ 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);
+ struct devfreq_policy *policy = &to_devfreq(dev)->policy;

- return sprintf(buf, "%lu\n", MIN(df->scaling_max_freq, df->max_freq));
+ return sprintf(buf, "%lu\n",
+ MIN(policy->devinfo.max_freq, policy->user.max_freq));
}
static DEVICE_ATTR_RW(max_freq);

diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c
index 3bc29acbd54e..e0987c749ec2 100644
--- a/drivers/devfreq/governor_passive.c
+++ b/drivers/devfreq/governor_passive.c
@@ -99,12 +99,12 @@ static int update_devfreq_passive(struct devfreq *devfreq, unsigned long freq)
{
int ret;

- if (!devfreq->governor)
+ if (!devfreq->policy.governor)
return -EINVAL;

mutex_lock_nested(&devfreq->lock, SINGLE_DEPTH_NESTING);

- ret = devfreq->governor->get_target_freq(devfreq, &freq);
+ ret = devfreq->policy.governor->get_target_freq(devfreq, &freq);
if (ret < 0)
goto out;

diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 3aae5b3af87c..9bf23b976f4d 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -109,6 +109,30 @@ struct devfreq_dev_profile {
unsigned int max_state;
};

+/**
+ * struct devfreq_freq_limits - Devfreq frequency limits
+ * @min_freq: minimum frequency
+ * @max_freq: maximum frequency
+ */
+struct devfreq_freq_limits {
+ unsigned long min_freq;
+ unsigned long max_freq;
+};
+
+/**
+ * struct devfreq_policy - Devfreq policy
+ * @user: frequency limits requested by the user
+ * @devinfo: frequency limits of the device (available OPPs)
+ * @governor: method how to choose frequency based on the usage.
+ * @governor_name: devfreq governor name for use with this devfreq
+ */
+struct devfreq_policy {
+ struct devfreq_freq_limits user;
+ struct devfreq_freq_limits devinfo;
+ const struct devfreq_governor *governor;
+ char governor_name[DEVFREQ_NAME_LEN];
+};
+
/**
* struct devfreq - Device devfreq structure
* @node: list node - contains the devices with devfreq that have been
@@ -117,8 +141,6 @@ struct devfreq_dev_profile {
* @dev: device registered by devfreq class. dev.parent is the device
* using devfreq.
* @profile: device-specific devfreq profile
- * @governor: method how to choose frequency based on the usage.
- * @governor_name: devfreq governor name for use with this devfreq
* @nb: notifier block used to notify devfreq object that it should
* reevaluate operable frequencies. Devfreq users may use
* devfreq.nb to the corresponding register notifier call chain.
@@ -126,10 +148,7 @@ struct devfreq_dev_profile {
* @previous_freq: previously configured frequency value.
* @data: Private data of the governor. The devfreq framework does not
* touch this.
- * @min_freq: Limit minimum frequency requested by user (0: none)
- * @max_freq: Limit maximum frequency requested by user (0: none)
- * @scaling_min_freq: Limit minimum frequency requested by OPP interface
- * @scaling_max_freq: Limit maximum frequency requested by OPP interface
+ * @policy: Policy for frequency adjustments
* @stop_polling: devfreq polling status of a device.
* @total_trans: Number of devfreq transitions
* @trans_table: Statistics of devfreq transitions
@@ -151,8 +170,6 @@ struct devfreq {
struct mutex lock;
struct device dev;
struct devfreq_dev_profile *profile;
- const struct devfreq_governor *governor;
- char governor_name[DEVFREQ_NAME_LEN];
struct notifier_block nb;
struct delayed_work work;

@@ -161,10 +178,7 @@ struct devfreq {

void *data; /* private data for governors */

- unsigned long min_freq;
- unsigned long max_freq;
- unsigned long scaling_min_freq;
- unsigned long scaling_max_freq;
+ struct devfreq_policy policy;
bool stop_polling;

/* information for device frequency transition */
--
2.18.0.rc2.346.g013aa6912e-goog

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Previous message: Matthias Kaehlcke: "[PATCH v4 05/12] PM / devfreq: Add support for policy notifiers"
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