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thermal: add available policies sysfs attribute

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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: Wei Ni <wni@nvidia.com>
Reviewed-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Ni Wade 2015-07-14 15:40:56 +08:00 committed by Zhang Rui
parent 74d33293e4
commit 25a0a5ce16
2 changed files with 34 additions and 0 deletions
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6
Documentation/thermal/sysfs-api.txt
View File

@ -180,6 +180,7 @@ Thermal zone device sys I/F, created once it's registered:
|---temp: Current temperature
|---mode: Working mode of the thermal 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-*]_type: Trip point type
|---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.
RW, Required
available_policies
Available thermal governors which can be used for a particular zone.
RO, Required
trip_point_[0-*]_temp
The temperature above which trip point will be fired.
Unit: millidegree Celsius
@ -417,6 +422,7 @@ method, the sys I/F structure will be built like this:
|---temp: 37000
|---mode: enabled
|---policy: step_wise
|---available_policies: step_wise fair_share
|---trip_point_0_temp: 100000
|---trip_point_0_type: critical
|---trip_point_1_temp: 80000

28
drivers/thermal/thermal_core.c
View File

@ -847,6 +847,27 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
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
static ssize_t
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(passive, S_IRUGO | S_IWUSR, passive_show, passive_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 */
#define to_cooling_device(_dev) \
@ -1817,6 +1839,11 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
if (result)
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 */
mutex_lock(&thermal_governor_lock);
@ -1917,6 +1944,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
if (tz->ops->get_mode)
device_remove_file(&tz->device, &dev_attr_mode);
device_remove_file(&tz->device, &dev_attr_policy);
device_remove_file(&tz->device, &dev_attr_available_policies);
remove_trip_attrs(tz);
thermal_set_governor(tz, NULL);