Date:   Wed, 20 Jun 2018 18:52:29 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:     Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        Benson Leung <bleung@...omium.org>,
        Olof Johansson <olof@...om.net>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH v4 04/12] PM / devfreq: Add struct devfreq_policy

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@...omium.org>
Reviewed-by: Brian Norris <briannorris@...omium.org>
---
Changes in v4:
- added 'Reviewed-by: Brian Norris <briannorris@...omium.org>' 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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