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>
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@ -180,6 +180,7 @@ Thermal zone device sys I/F, created once it's registered:
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|---temp: Current temperature
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|---temp: Current temperature
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|---mode: Working mode of the thermal zone
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|---mode: Working mode of the thermal zone
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|---policy: Thermal governor used for this zone
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|---policy: Thermal governor used for this zone
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|---available_policies: Available thermal governors for this zone
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|---trip_point_[0-*]_temp: Trip point temperature
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|---trip_point_[0-*]_temp: Trip point temperature
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|---trip_point_[0-*]_type: Trip point type
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|---trip_point_[0-*]_type: Trip point type
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|---trip_point_[0-*]_hyst: Hysteresis value for this trip point
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|---trip_point_[0-*]_hyst: Hysteresis value for this trip point
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@ -256,6 +257,10 @@ policy
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One of the various thermal governors used for a particular zone.
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One of the various thermal governors used for a particular zone.
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RW, Required
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RW, Required
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available_policies
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Available thermal governors which can be used for a particular zone.
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RO, Required
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trip_point_[0-*]_temp
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trip_point_[0-*]_temp
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The temperature above which trip point will be fired.
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The temperature above which trip point will be fired.
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Unit: millidegree Celsius
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Unit: millidegree Celsius
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@ -417,6 +422,7 @@ method, the sys I/F structure will be built like this:
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|---temp: 37000
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|---temp: 37000
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|---mode: enabled
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|---mode: enabled
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|---policy: step_wise
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|---policy: step_wise
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|---available_policies: step_wise fair_share
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|---trip_point_0_temp: 100000
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|---trip_point_0_temp: 100000
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|---trip_point_0_type: critical
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|---trip_point_0_type: critical
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|---trip_point_1_temp: 80000
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|---trip_point_1_temp: 80000
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@ -847,6 +847,27 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
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return sprintf(buf, "%s\n", tz->governor->name);
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return sprintf(buf, "%s\n", tz->governor->name);
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}
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}
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static ssize_t
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available_policies_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct thermal_governor *pos;
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ssize_t count = 0;
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ssize_t size = PAGE_SIZE;
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mutex_lock(&thermal_governor_lock);
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list_for_each_entry(pos, &thermal_governor_list, governor_list) {
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size = PAGE_SIZE - count;
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count += scnprintf(buf + count, size, "%s ", pos->name);
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}
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count += scnprintf(buf + count, size, "\n");
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mutex_unlock(&thermal_governor_lock);
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return count;
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}
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#ifdef CONFIG_THERMAL_EMULATION
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#ifdef CONFIG_THERMAL_EMULATION
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static ssize_t
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static ssize_t
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emul_temp_store(struct device *dev, struct device_attribute *attr,
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emul_temp_store(struct device *dev, struct device_attribute *attr,
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@ -1032,6 +1053,7 @@ static DEVICE_ATTR(temp, 0444, temp_show, NULL);
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static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
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static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
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static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
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static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
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static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
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static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
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static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
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/* sys I/F for cooling device */
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/* sys I/F for cooling device */
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#define to_cooling_device(_dev) \
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#define to_cooling_device(_dev) \
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@ -1817,6 +1839,11 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
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if (result)
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if (result)
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goto unregister;
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goto unregister;
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/* Create available_policies attribute */
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result = device_create_file(&tz->device, &dev_attr_available_policies);
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if (result)
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goto unregister;
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/* Update 'this' zone's governor information */
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/* Update 'this' zone's governor information */
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mutex_lock(&thermal_governor_lock);
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mutex_lock(&thermal_governor_lock);
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@ -1917,6 +1944,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
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if (tz->ops->get_mode)
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if (tz->ops->get_mode)
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device_remove_file(&tz->device, &dev_attr_mode);
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device_remove_file(&tz->device, &dev_attr_mode);
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device_remove_file(&tz->device, &dev_attr_policy);
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device_remove_file(&tz->device, &dev_attr_policy);
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device_remove_file(&tz->device, &dev_attr_available_policies);
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remove_trip_attrs(tz);
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remove_trip_attrs(tz);
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thermal_set_governor(tz, NULL);
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thermal_set_governor(tz, NULL);
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