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Open Menu / Documentation / hwmon / peci-cputemp.rst
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.. SPDX-License-Identifier: GPL-2.0-only

Kernel driver peci-cputemp
==========================

Supported chips:
	One of Intel server CPUs listed below which is connected to a PECI bus.
		* Intel Xeon E5/E7 v3 server processors
			Intel Xeon E5-14xx v3 family
			Intel Xeon E5-24xx v3 family
			Intel Xeon E5-16xx v3 family
			Intel Xeon E5-26xx v3 family
			Intel Xeon E5-46xx v3 family
			Intel Xeon E7-48xx v3 family
			Intel Xeon E7-88xx v3 family
		* Intel Xeon E5/E7 v4 server processors
			Intel Xeon E5-16xx v4 family
			Intel Xeon E5-26xx v4 family
			Intel Xeon E5-46xx v4 family
			Intel Xeon E7-48xx v4 family
			Intel Xeon E7-88xx v4 family
		* Intel Xeon Scalable server processors
			Intel Xeon D family
			Intel Xeon Bronze family
			Intel Xeon Silver family
			Intel Xeon Gold family
			Intel Xeon Platinum family

	Datasheet: Available from http://www.intel.com/design/literature.htm

Author: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>

Description
-----------

This driver implements a generic PECI hwmon feature which provides Digital
Thermal Sensor (DTS) thermal readings of the CPU package and CPU cores that are
accessible via the processor PECI interface.

All temperature values are given in millidegree Celsius and will be measurable
only when the target CPU is powered on.

Sysfs interface
-------------------

======================= =======================================================
temp1_label		"Die"
temp1_input		Provides current die temperature of the CPU package.
temp1_max		Provides thermal control temperature of the CPU package
			which is also known as Tcontrol.
temp1_crit		Provides shutdown temperature of the CPU package which
			is also known as the maximum processor junction
			temperature, Tjmax or Tprochot.
temp1_crit_hyst		Provides the hysteresis value from Tcontrol to Tjmax of
			the CPU package.

temp2_label		"DTS"
temp2_input		Provides current temperature of the CPU package scaled
			to match DTS thermal profile.
temp2_max		Provides thermal control temperature of the CPU package
			which is also known as Tcontrol.
temp2_crit		Provides shutdown temperature of the CPU package which
			is also known as the maximum processor junction
			temperature, Tjmax or Tprochot.
temp2_crit_hyst		Provides the hysteresis value from Tcontrol to Tjmax of
			the CPU package.

temp3_label		"Tcontrol"
temp3_input		Provides current Tcontrol temperature of the CPU
			package which is also known as Fan Temperature target.
			Indicates the relative value from thermal monitor trip
			temperature at which fans should be engaged.
temp3_crit		Provides Tcontrol critical value of the CPU package
			which is same to Tjmax.

temp4_label		"Tthrottle"
temp4_input		Provides current Tthrottle temperature of the CPU
			package. Used for throttling temperature. If this value
			is allowed and lower than Tjmax - the throttle will
			occur and reported at lower than Tjmax.

temp5_label		"Tjmax"
temp5_input		Provides the maximum junction temperature, Tjmax of the
			CPU package.

temp[6-N]_label		Provides string "Core X", where X is resolved core
			number.
temp[6-N]_input		Provides current temperature of each core.

======================= =======================================================