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thermal: export weight to sysfs
It's useful to have access to the weights for the cooling devices for thermal zones and change them if needed. Export them to sysfs. Cc: Zhang Rui <rui.zhang@intel.com> Cc: Eduardo Valentin <edubezval@gmail.com> Signed-off-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
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3 changed files with 56 additions and 1 deletions
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@ -194,6 +194,8 @@ thermal_zone_bind_cooling_device/thermal_zone_unbind_cooling_device.
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/sys/class/thermal/thermal_zone[0-*]:
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|---cdev[0-*]: [0-*]th cooling device in current thermal zone
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|---cdev[0-*]_trip_point: Trip point that cdev[0-*] is associated with
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|---cdev[0-*]_weight: Influence of the cooling device in
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this thermal zone
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Besides the thermal zone device sysfs I/F and cooling device sysfs I/F,
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the generic thermal driver also creates a hwmon sysfs I/F for each _type_
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@ -267,6 +269,14 @@ cdev[0-*]_trip_point
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point.
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RO, Optional
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cdev[0-*]_weight
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The influence of cdev[0-*] in this thermal zone. This value
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is relative to the rest of cooling devices in the thermal
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zone. For example, if a cooling device has a weight double
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than that of other, it's twice as effective in cooling the
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thermal zone.
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RW, Optional
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passive
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Attribute is only present for zones in which the passive cooling
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policy is not supported by native thermal driver. Default is zero
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@ -320,7 +330,8 @@ passive, active. If an ACPI thermal zone supports critical, passive,
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active[0] and active[1] at the same time, it may register itself as a
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thermal_zone_device (thermal_zone1) with 4 trip points in all.
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It has one processor and one fan, which are both registered as
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thermal_cooling_device.
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thermal_cooling_device. Both are considered to have the same
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effectiveness in cooling the thermal zone.
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If the processor is listed in _PSL method, and the fan is listed in _AL0
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method, the sys I/F structure will be built like this:
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@ -342,8 +353,10 @@ method, the sys I/F structure will be built like this:
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|---trip_point_3_type: active1
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|---cdev0: --->/sys/class/thermal/cooling_device0
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|---cdev0_trip_point: 1 /* cdev0 can be used for passive */
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|---cdev0_weight: 1024
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|---cdev1: --->/sys/class/thermal/cooling_device3
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|---cdev1_trip_point: 2 /* cdev1 can be used for active[0]*/
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|---cdev1_weight: 1024
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|cooling_device0:
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|---type: Processor
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@ -922,6 +922,34 @@ static const struct attribute_group *cooling_device_attr_groups[] = {
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NULL,
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};
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static ssize_t
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thermal_cooling_device_weight_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct thermal_instance *instance;
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instance = container_of(attr, struct thermal_instance, weight_attr);
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return sprintf(buf, "%d\n", instance->weight);
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}
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static ssize_t
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thermal_cooling_device_weight_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_instance *instance;
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int ret, weight;
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ret = kstrtoint(buf, 0, &weight);
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if (ret)
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return ret;
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instance = container_of(attr, struct thermal_instance, weight_attr);
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instance->weight = weight;
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return count;
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}
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/* Device management */
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/**
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@ -1016,6 +1044,16 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
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if (result)
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goto remove_symbol_link;
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sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
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sysfs_attr_init(&dev->weight_attr.attr);
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dev->weight_attr.attr.name = dev->weight_attr_name;
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dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
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dev->weight_attr.show = thermal_cooling_device_weight_show;
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dev->weight_attr.store = thermal_cooling_device_weight_store;
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result = device_create_file(&tz->device, &dev->weight_attr);
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if (result)
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goto remove_trip_file;
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mutex_lock(&tz->lock);
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mutex_lock(&cdev->lock);
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list_for_each_entry(pos, &tz->thermal_instances, tz_node)
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@ -1033,6 +1071,8 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
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if (!result)
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return 0;
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device_remove_file(&tz->device, &dev->weight_attr);
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remove_trip_file:
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device_remove_file(&tz->device, &dev->attr);
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remove_symbol_link:
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sysfs_remove_link(&tz->device.kobj, dev->name);
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@ -46,6 +46,8 @@ struct thermal_instance {
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unsigned long target; /* expected cooling state */
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char attr_name[THERMAL_NAME_LENGTH];
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struct device_attribute attr;
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char weight_attr_name[THERMAL_NAME_LENGTH];
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struct device_attribute weight_attr;
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struct list_head tz_node; /* node in tz->thermal_instances */
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struct list_head cdev_node; /* node in cdev->thermal_instances */
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unsigned int weight; /* The weight of the cooling device */
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