Commit 03a971a2 authored by Matthew Garrett's avatar Matthew Garrett Committed by Len Brown
Browse files

thermal: support forcing support for passive cooling 



Due to poor thermal design or Linux driving hardware outside its thermal
envelope, some systems will reach critical temperature and shut down
under high load. This patch adds support for forcing a polling-based
passive trip point if the firmware doesn't provide one. The assumption
is made that the processor is the most practical means to reduce the
dynamic heat generation, so hitting the passive thermal limit will cause
the CPU to be throttled until the temperature stabalises around the
defined value.

UI is provided via a "passive" sysfs entry in the thermal zone
directory. It accepts a decimal value in millidegrees celsius, or "0" to
disable the functionality. Default behaviour is for this functionality
to be disabled.

Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent f6f5c45e

drivers/thermal/thermal_sys.c

+77 −0
Original line number Diff line number Diff line
@@ -214,9 +214,69 @@ trip_point_temp_show(struct device *dev, struct device_attribute *attr, 
	return sprintf(buf, "%ld\n", temperature);

}



static ssize_t

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

		    const char *buf, size_t count)

{

	struct thermal_zone_device *tz = to_thermal_zone(dev);

	struct thermal_cooling_device *cdev = NULL;

	int state;



	if (!sscanf(buf, "%d\n", &state))

		return -EINVAL;



	if (state && !tz->forced_passive) {

		mutex_lock(&thermal_list_lock);

		list_for_each_entry(cdev, &thermal_cdev_list, node) {

			if (!strncmp("Processor", cdev->type,

				     sizeof("Processor")))

				thermal_zone_bind_cooling_device(tz,

								 THERMAL_TRIPS_NONE,

								 cdev);

		}

		mutex_unlock(&thermal_list_lock);

	} else if (!state && tz->forced_passive) {

		mutex_lock(&thermal_list_lock);

		list_for_each_entry(cdev, &thermal_cdev_list, node) {

			if (!strncmp("Processor", cdev->type,

				     sizeof("Processor")))

				thermal_zone_unbind_cooling_device(tz,

								   THERMAL_TRIPS_NONE,

								   cdev);

		}

		mutex_unlock(&thermal_list_lock);

	}



	tz->tc1 = 1;

	tz->tc2 = 1;



	if (!tz->passive_delay)

		tz->passive_delay = 1000;



	if (!tz->polling_delay)

		tz->polling_delay = 10000;



	tz->forced_passive = state;



	thermal_zone_device_update(tz);



	return count;

}



static ssize_t

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

		   char *buf)

{

	struct thermal_zone_device *tz = to_thermal_zone(dev);



	return sprintf(buf, "%d\n", tz->forced_passive);

}



static DEVICE_ATTR(type, 0444, type_show, NULL);

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 struct device_attribute trip_point_attrs[] = {

	__ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
@@ -939,6 +999,11 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) 
			break;

		}

	}



	if (tz->forced_passive)

		thermal_zone_device_passive(tz, temp, tz->forced_passive,

					    THERMAL_TRIPS_NONE);



	tz->last_temperature = temp;

	if (tz->passive)

		thermal_zone_device_set_polling(tz, tz->passive_delay);
@@ -977,8 +1042,10 @@ struct thermal_zone_device *thermal_zone_device_register(char *type, 
{

	struct thermal_zone_device *tz;

	struct thermal_cooling_device *pos;

	enum thermal_trip_type trip_type;

	int result;

	int count;

	int passive = 0;



	if (strlen(type) >= THERMAL_NAME_LENGTH)

		return ERR_PTR(-EINVAL);
@@ -1041,8 +1108,18 @@ struct thermal_zone_device *thermal_zone_device_register(char *type, 
		TRIP_POINT_ATTR_ADD(&tz->device, count, result);

		if (result)

			goto unregister;

		tz->ops->get_trip_type(tz, count, &trip_type);

		if (trip_type == THERMAL_TRIP_PASSIVE)

			passive = 1;

	}



	if (!passive)

		result = device_create_file(&tz->device,

					    &dev_attr_passive);



	if (result)

		goto unregister;



	result = thermal_add_hwmon_sysfs(tz);

	if (result)

		goto unregister;

include/linux/thermal.h

+1 −0
Original line number Diff line number Diff line
@@ -113,6 +113,7 @@ struct thermal_zone_device { 
	int polling_delay;

	int last_temperature;

	bool passive;

	unsigned int forced_passive;

	struct thermal_zone_device_ops *ops;

	struct list_head cooling_devices;

	struct idr idr;

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