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[PATCHv3,06/15] Thermal: Add thermal governor registration APIs

Message ID 1346500296-25200-7-git-send-email-durgadoss.r@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

durgadoss.r@intel.com Sept. 1, 2012, 11:51 a.m. UTC 
This patch creates a structure to hold platform
thermal governor information, and provides APIs
for individual thermal governors to register/unregister
with the Thermal framework.

Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
---
 drivers/thermal/thermal_sys.c |   90 +++++++++++++++++++++++++++++++++++++++++
 include/linux/thermal.h       |   16 ++++++++
 2 files changed, 106 insertions(+)

Comments

Zhang Rui Sept. 10, 2012, 8:28 a.m. UTC | #1 
On ?, 2012-09-01 at 17:21 +0530, Durgadoss R wrote:
> This patch creates a structure to hold platform
> thermal governor information, and provides APIs
> for individual thermal governors to register/unregister
> with the Thermal framework.
> 
> Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
> ---
>  drivers/thermal/thermal_sys.c |   90 +++++++++++++++++++++++++++++++++++++++++
>  include/linux/thermal.h       |   16 ++++++++
>  2 files changed, 106 insertions(+)
> 
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index a642d1c..541da47 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -49,7 +49,86 @@ static DEFINE_MUTEX(thermal_idr_lock);
>  
>  static LIST_HEAD(thermal_tz_list);
>  static LIST_HEAD(thermal_cdev_list);
> +static LIST_HEAD(thermal_governor_list);
> +
>  static DEFINE_MUTEX(thermal_list_lock);
> +static DEFINE_MUTEX(thermal_governor_lock);
> +
> +static struct thermal_governor *__find_governor(const char *name)
> +{
> +	struct thermal_governor *pos;
> +
> +	list_for_each_entry(pos, &thermal_governor_list, governor_list)
> +		if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
> +			return pos;
> +
I'm wondering if we should return NULL here or not.
because you are invoking tz->governor->throttle() without any checking.
if there is no matched governor, fall back to the default one instead.

> +	return NULL;
> +}
> +
> +int thermal_register_governor(struct thermal_governor *governor)
> +{
> +	int err;
> +	const char *name;
> +	struct thermal_zone_device *pos;
> +
> +	if (!governor)
> +		return -EINVAL;
> +
> +	mutex_lock(&thermal_governor_lock);
> +
> +	err = -EBUSY;
> +	if (__find_governor(governor->name) == NULL) {
> +		err = 0;
> +		list_add(&governor->governor_list, &thermal_governor_list);
> +	}
> +
> +	mutex_lock(&thermal_list_lock);
> +
> +	list_for_each_entry(pos, &thermal_tz_list, node) {
> +		if (pos->governor)
> +			continue;
> +		if (pos->tzp)
> +			name = pos->tzp->governor_name;
> +		else
> +			name = DEFAULT_THERMAL_GOVERNOR;
> +		if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
> +			pos->governor = governor;
> +	}
> +
> +	mutex_unlock(&thermal_list_lock);
> +	mutex_unlock(&thermal_governor_lock);
> +
> +	return err;
> +}
> +EXPORT_SYMBOL_GPL(thermal_register_governor);
> +
> +void thermal_unregister_governor(struct thermal_governor *governor)
> +{
> +	struct thermal_zone_device *pos;
> +
> +	if (!governor)
> +		return;
> +
> +	mutex_lock(&thermal_governor_lock);
> +
> +	if (__find_governor(governor->name) == NULL)
> +		goto exit;
> +
> +	mutex_lock(&thermal_list_lock);
> +
> +	list_for_each_entry(pos, &thermal_tz_list, node) {
> +		if (!strnicmp(pos->governor->name, governor->name,
> +						THERMAL_NAME_LENGTH))
> +			pos->governor = NULL;
> +	}
> +
> +	mutex_unlock(&thermal_list_lock);
> +	list_del(&governor->governor_list);
> +exit:
> +	mutex_unlock(&thermal_governor_lock);
> +	return;
> +}
> +EXPORT_SYMBOL_GPL(thermal_unregister_governor);
>  
>  static int get_idr(struct idr *idr, struct mutex *lock, int *id)
>  {
> @@ -1439,6 +1518,16 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
>  	if (result)
>  		goto unregister;
>  
> +	/* Update 'this' zone's governor information */
> +	mutex_lock(&thermal_governor_lock);
> +
> +	if (tz->tzp)

what if tzp->governor_name is not set, usually this mean the platform
driver wants to use the default governor.
so the code should be
	 if (tz->tzp && tz->tzp->governor_name[0])

thanks,
rui
> +		tz->governor = __find_governor(tz->tzp->governor_name);
> +	else
> +		tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
> +
> +	mutex_unlock(&thermal_governor_lock);
> +
>  	result = thermal_add_hwmon_sysfs(tz);
>  	if (result)
>  		goto unregister;
> @@ -1502,6 +1591,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
>  	if (tz->ops->get_mode)
>  		device_remove_file(&tz->device, &dev_attr_mode);
>  	remove_trip_attrs(tz);
> +	tz->governor = NULL;
>  
>  	thermal_remove_hwmon_sysfs(tz);
>  	release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 58cb1c0..6182bd5 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -46,6 +46,9 @@
>  #define THERMAL_GENL_VERSION                    0x01
>  #define THERMAL_GENL_MCAST_GROUP_NAME           "thermal_mc_group"
>  
> +/* Default Thermal Governor: Does Linear Throttling */
> +#define DEFAULT_THERMAL_GOVERNOR	"step_wise"
> +
>  struct thermal_zone_device;
>  struct thermal_cooling_device;
>  
> @@ -158,6 +161,7 @@ struct thermal_zone_device {
>  	unsigned int forced_passive;
>  	const struct thermal_zone_device_ops *ops;
>  	const struct thermal_zone_params *tzp;
> +	struct thermal_governor *governor;
>  	struct list_head thermal_instances;
>  	struct idr idr;
>  	struct mutex lock; /* protect thermal_instances list */
> @@ -165,6 +169,14 @@ struct thermal_zone_device {
>  	struct delayed_work poll_queue;
>  };
>  
> +/* Structure that holds thermal governor information */
> +struct thermal_governor {
> +	char name[THERMAL_NAME_LENGTH];
> +	int (*throttle)(struct thermal_zone_device *tz, int trip);
> +	struct list_head	governor_list;
> +	struct module		*owner;
> +};
> +
>  /* Structure that holds binding parameters for a zone */
>  struct thermal_bind_params {
>  	struct thermal_cooling_device *cdev;
> @@ -189,6 +201,7 @@ struct thermal_bind_params {
>  
>  /* Structure to define Thermal Zone parameters */
>  struct thermal_zone_params {
> +	char governor_name[THERMAL_NAME_LENGTH];
>  	int num_tbps;	/* Number of tbp entries */
>  	struct thermal_bind_params *tbp;
>  };
> @@ -219,6 +232,9 @@ int get_tz_trend(struct thermal_zone_device *, int);
>  struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
>  		struct thermal_cooling_device *, int);
>  
> +int thermal_register_governor(struct thermal_governor *);
> +void thermal_unregister_governor(struct thermal_governor *);
> +
>  #ifdef CONFIG_NET
>  extern int thermal_generate_netlink_event(u32 orig, enum events event);
>  #else


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diff mbox

Patch

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index a642d1c..541da47 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -49,7 +49,86 @@  static DEFINE_MUTEX(thermal_idr_lock);
 
 static LIST_HEAD(thermal_tz_list);
 static LIST_HEAD(thermal_cdev_list);
+static LIST_HEAD(thermal_governor_list);
+
 static DEFINE_MUTEX(thermal_list_lock);
+static DEFINE_MUTEX(thermal_governor_lock);
+
+static struct thermal_governor *__find_governor(const char *name)
+{
+	struct thermal_governor *pos;
+
+	list_for_each_entry(pos, &thermal_governor_list, governor_list)
+		if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
+			return pos;
+
+	return NULL;
+}
+
+int thermal_register_governor(struct thermal_governor *governor)
+{
+	int err;
+	const char *name;
+	struct thermal_zone_device *pos;
+
+	if (!governor)
+		return -EINVAL;
+
+	mutex_lock(&thermal_governor_lock);
+
+	err = -EBUSY;
+	if (__find_governor(governor->name) == NULL) {
+		err = 0;
+		list_add(&governor->governor_list, &thermal_governor_list);
+	}
+
+	mutex_lock(&thermal_list_lock);
+
+	list_for_each_entry(pos, &thermal_tz_list, node) {
+		if (pos->governor)
+			continue;
+		if (pos->tzp)
+			name = pos->tzp->governor_name;
+		else
+			name = DEFAULT_THERMAL_GOVERNOR;
+		if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
+			pos->governor = governor;
+	}
+
+	mutex_unlock(&thermal_list_lock);
+	mutex_unlock(&thermal_governor_lock);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(thermal_register_governor);
+
+void thermal_unregister_governor(struct thermal_governor *governor)
+{
+	struct thermal_zone_device *pos;
+
+	if (!governor)
+		return;
+
+	mutex_lock(&thermal_governor_lock);
+
+	if (__find_governor(governor->name) == NULL)
+		goto exit;
+
+	mutex_lock(&thermal_list_lock);
+
+	list_for_each_entry(pos, &thermal_tz_list, node) {
+		if (!strnicmp(pos->governor->name, governor->name,
+						THERMAL_NAME_LENGTH))
+			pos->governor = NULL;
+	}
+
+	mutex_unlock(&thermal_list_lock);
+	list_del(&governor->governor_list);
+exit:
+	mutex_unlock(&thermal_governor_lock);
+	return;
+}
+EXPORT_SYMBOL_GPL(thermal_unregister_governor);
 
 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 {
@@ -1439,6 +1518,16 @@  struct thermal_zone_device *thermal_zone_device_register(const char *type,
 	if (result)
 		goto unregister;
 
+	/* Update 'this' zone's governor information */
+	mutex_lock(&thermal_governor_lock);
+
+	if (tz->tzp)
+		tz->governor = __find_governor(tz->tzp->governor_name);
+	else
+		tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
+
+	mutex_unlock(&thermal_governor_lock);
+
 	result = thermal_add_hwmon_sysfs(tz);
 	if (result)
 		goto unregister;
@@ -1502,6 +1591,7 @@  void thermal_zone_device_unregister(struct thermal_zone_device *tz)
 	if (tz->ops->get_mode)
 		device_remove_file(&tz->device, &dev_attr_mode);
 	remove_trip_attrs(tz);
+	tz->governor = NULL;
 
 	thermal_remove_hwmon_sysfs(tz);
 	release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 58cb1c0..6182bd5 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -46,6 +46,9 @@ 
 #define THERMAL_GENL_VERSION                    0x01
 #define THERMAL_GENL_MCAST_GROUP_NAME           "thermal_mc_group"
 
+/* Default Thermal Governor: Does Linear Throttling */
+#define DEFAULT_THERMAL_GOVERNOR	"step_wise"
+
 struct thermal_zone_device;
 struct thermal_cooling_device;
 
@@ -158,6 +161,7 @@  struct thermal_zone_device {
 	unsigned int forced_passive;
 	const struct thermal_zone_device_ops *ops;
 	const struct thermal_zone_params *tzp;
+	struct thermal_governor *governor;
 	struct list_head thermal_instances;
 	struct idr idr;
 	struct mutex lock; /* protect thermal_instances list */
@@ -165,6 +169,14 @@  struct thermal_zone_device {
 	struct delayed_work poll_queue;
 };
 
+/* Structure that holds thermal governor information */
+struct thermal_governor {
+	char name[THERMAL_NAME_LENGTH];
+	int (*throttle)(struct thermal_zone_device *tz, int trip);
+	struct list_head	governor_list;
+	struct module		*owner;
+};
+
 /* Structure that holds binding parameters for a zone */
 struct thermal_bind_params {
 	struct thermal_cooling_device *cdev;
@@ -189,6 +201,7 @@  struct thermal_bind_params {
 
 /* Structure to define Thermal Zone parameters */
 struct thermal_zone_params {
+	char governor_name[THERMAL_NAME_LENGTH];
 	int num_tbps;	/* Number of tbp entries */
 	struct thermal_bind_params *tbp;
 };
@@ -219,6 +232,9 @@  int get_tz_trend(struct thermal_zone_device *, int);
 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
 		struct thermal_cooling_device *, int);
 
+int thermal_register_governor(struct thermal_governor *);
+void thermal_unregister_governor(struct thermal_governor *);
+
 #ifdef CONFIG_NET
 extern int thermal_generate_netlink_event(u32 orig, enum events event);
 #else