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Commit 25a0a5ce authored by Ni Wade's avatar Ni Wade Committed by Zhang Rui
Browse files

thermal: add available policies sysfs attribute 



The Linux thermal framework support to change thermal governor
policy in userspace, but it can't show what available policies
supported.

This patch adds available_policies attribute to the thermal
framework, it can list the thermal governors which can be
used for a particular zone. This attribute is read only.

Signed-off-by: default avatarWei Ni <wni@nvidia.com>
Reviewed-by: default avatarJavi Merino <javi.merino@arm.com>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
parent 74d33293

Documentation/thermal/sysfs-api.txt

+6 −0
Original line number Original line Diff line number Diff line
@@ -180,6 +180,7 @@ Thermal zone device sys I/F, created once it's registered: 
    |---temp:			Current temperature

    |---temp:			Current temperature

    |---mode:			Working mode of the thermal zone

    |---mode:			Working mode of the thermal zone

    |---policy:			Thermal governor used for this zone

    |---policy:			Thermal governor used for this zone

    |---available_policies:	Available thermal governors for this zone

    |---trip_point_[0-*]_temp:	Trip point temperature

    |---trip_point_[0-*]_temp:	Trip point temperature

    |---trip_point_[0-*]_type:	Trip point type

    |---trip_point_[0-*]_type:	Trip point type

    |---trip_point_[0-*]_hyst:	Hysteresis value for this trip point

    |---trip_point_[0-*]_hyst:	Hysteresis value for this trip point
@@ -256,6 +257,10 @@ policy 
	One of the various thermal governors used for a particular zone.

	One of the various thermal governors used for a particular zone.

	RW, Required

	RW, Required





available_policies

	Available thermal governors which can be used for a particular zone.

	RO, Required



trip_point_[0-*]_temp

trip_point_[0-*]_temp

	The temperature above which trip point will be fired.

	The temperature above which trip point will be fired.

	Unit: millidegree Celsius

	Unit: millidegree Celsius
@@ -417,6 +422,7 @@ method, the sys I/F structure will be built like this: 
    |---temp:			37000

    |---temp:			37000

    |---mode:			enabled

    |---mode:			enabled

    |---policy:			step_wise

    |---policy:			step_wise

    |---available_policies:	step_wise fair_share

    |---trip_point_0_temp:	100000

    |---trip_point_0_temp:	100000

    |---trip_point_0_type:	critical

    |---trip_point_0_type:	critical

    |---trip_point_1_temp:	80000

    |---trip_point_1_temp:	80000

drivers/thermal/thermal_core.c

+28 −0
Original line number Original line Diff line number Diff line
@@ -847,6 +847,27 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf) 
	return sprintf(buf, "%s\n", tz->governor->name);

	return sprintf(buf, "%s\n", tz->governor->name);

}

}





static ssize_t

available_policies_show(struct device *dev, struct device_attribute *devattr,

			char *buf)

{

	struct thermal_governor *pos;

	ssize_t count = 0;

	ssize_t size = PAGE_SIZE;



	mutex_lock(&thermal_governor_lock);



	list_for_each_entry(pos, &thermal_governor_list, governor_list) {

		size = PAGE_SIZE - count;

		count += scnprintf(buf + count, size, "%s ", pos->name);

	}

	count += scnprintf(buf + count, size, "\n");



	mutex_unlock(&thermal_governor_lock);



	return count;

}



#ifdef CONFIG_THERMAL_EMULATION

#ifdef CONFIG_THERMAL_EMULATION

static ssize_t

static ssize_t

emul_temp_store(struct device *dev, struct device_attribute *attr,

emul_temp_store(struct device *dev, struct device_attribute *attr,
@@ -1032,6 +1053,7 @@ static DEVICE_ATTR(temp, 0444, temp_show, NULL); 
static DEVICE_ATTR(mode, 0644, mode_show, mode_store);

static DEVICE_ATTR(mode, 0644, mode_show, mode_store);

static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);

static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);

static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);

static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);

static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);





/* sys I/F for cooling device */

/* sys I/F for cooling device */

#define to_cooling_device(_dev)	\

#define to_cooling_device(_dev)	\
@@ -1817,6 +1839,11 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, 
	if (result)

	if (result)

		goto unregister;

		goto unregister;





	/* Create available_policies attribute */

	result = device_create_file(&tz->device, &dev_attr_available_policies);

	if (result)

		goto unregister;



	/* Update 'this' zone's governor information */

	/* Update 'this' zone's governor information */

	mutex_lock(&thermal_governor_lock);

	mutex_lock(&thermal_governor_lock);
@@ -1917,6 +1944,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) 
	if (tz->ops->get_mode)

	if (tz->ops->get_mode)

		device_remove_file(&tz->device, &dev_attr_mode);

		device_remove_file(&tz->device, &dev_attr_mode);

	device_remove_file(&tz->device, &dev_attr_policy);

	device_remove_file(&tz->device, &dev_attr_policy);

	device_remove_file(&tz->device, &dev_attr_available_policies);

	remove_trip_attrs(tz);

	remove_trip_attrs(tz);

	thermal_set_governor(tz, NULL);

	thermal_set_governor(tz, NULL);