mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
23be63f48d
Added documentation describing details of the x86 package temperature thermal driver. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
Kernel driver: x86_pkg_temp_thermal
|
||
===================
|
||
|
||
Supported chips:
|
||
* x86: with package level thermal management
|
||
(Verify using: CPUID.06H:EAX[bit 6] =1)
|
||
|
||
Authors: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
|
||
|
||
Reference
|
||
---
|
||
Intel® 64 and IA-32 Architectures Software Developer’s Manual (Jan, 2013):
|
||
Chapter 14.6: PACKAGE LEVEL THERMAL MANAGEMENT
|
||
|
||
Description
|
||
---------
|
||
|
||
This driver register CPU digital temperature package level sensor as a thermal
|
||
zone with maximum two user mode configurable trip points. Number of trip points
|
||
depends on the capability of the package. Once the trip point is violated,
|
||
user mode can receive notification via thermal notification mechanism and can
|
||
take any action to control temperature.
|
||
|
||
|
||
Threshold management
|
||
--------------------
|
||
Each package will register as a thermal zone under /sys/class/thermal.
|
||
Example:
|
||
/sys/class/thermal/thermal_zone1
|
||
|
||
This contains two trip points:
|
||
- trip_point_0_temp
|
||
- trip_point_1_temp
|
||
|
||
User can set any temperature between 0 to TJ-Max temperature. Temperature units
|
||
are in milli-degree Celsius. Refer to "Documentation/thermal/sysfs-api.txt" for
|
||
thermal sys-fs details.
|
||
|
||
Any value other than 0 in these trip points, can trigger thermal notifications.
|
||
Setting 0, stops sending thermal notifications.
|
||
|
||
Thermal notifications: To get kobject-uevent notifications, set the thermal zone
|
||
policy to "user_space". For example: echo -n "user_space" > policy
|
||
|
||
|
||
|
||
|