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23be63f4 SP |
1 | Kernel driver: x86_pkg_temp_thermal |
2 | =================== | |
3 | ||
4 | Supported chips: | |
5 | * x86: with package level thermal management | |
6 | (Verify using: CPUID.06H:EAX[bit 6] =1) | |
7 | ||
8 | Authors: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | |
9 | ||
10 | Reference | |
11 | --- | |
12 | Intel® 64 and IA-32 Architectures Software Developer’s Manual (Jan, 2013): | |
13 | Chapter 14.6: PACKAGE LEVEL THERMAL MANAGEMENT | |
14 | ||
15 | Description | |
16 | --------- | |
17 | ||
18 | This driver register CPU digital temperature package level sensor as a thermal | |
19 | zone with maximum two user mode configurable trip points. Number of trip points | |
20 | depends on the capability of the package. Once the trip point is violated, | |
21 | user mode can receive notification via thermal notification mechanism and can | |
22 | take any action to control temperature. | |
23 | ||
24 | ||
25 | Threshold management | |
26 | -------------------- | |
27 | Each package will register as a thermal zone under /sys/class/thermal. | |
28 | Example: | |
29 | /sys/class/thermal/thermal_zone1 | |
30 | ||
31 | This contains two trip points: | |
32 | - trip_point_0_temp | |
33 | - trip_point_1_temp | |
34 | ||
35 | User can set any temperature between 0 to TJ-Max temperature. Temperature units | |
36 | are in milli-degree Celsius. Refer to "Documentation/thermal/sysfs-api.txt" for | |
37 | thermal sys-fs details. | |
38 | ||
39 | Any value other than 0 in these trip points, can trigger thermal notifications. | |
40 | Setting 0, stops sending thermal notifications. | |
41 | ||
42 | Thermal notifications: To get kobject-uevent notifications, set the thermal zone | |
43 | policy to "user_space". For example: echo -n "user_space" > policy | |
44 | ||
45 | ||
46 | ||
47 |