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: Wei Ni <wni@nvidia.com>
Reviewed-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index c1f6864..10f062e 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -180,6 +180,7 @@
|---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 @@
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 @@
|---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
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 04659bf..c470095 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -847,6 +847,27 @@
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(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 @@
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 @@
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);