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
|
