1 =================================== 2 Kernel driver: x86_pkg_temp_thermal 3 =================================== 4 5 Supported chips: 6 7 * x86: with package level thermal management 8 9 (Verify using: CPUID.06H:EAX[bit 6] =1) 10 11 Authors: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> 12 13 Reference 14 --------- 15 16 Intel® 64 and IA-32 Architectures Software Developer’s Manual (Jan, 2013): 17 Chapter 14.6: PACKAGE LEVEL THERMAL MANAGEMENT 18 19 Description 20 ----------- 21 22 This driver register CPU digital temperature package level sensor as a thermal 23 zone with maximum two user mode configurable trip points. Number of trip points 24 depends on the capability of the package. Once the trip point is violated, 25 user mode can receive notification via thermal notification mechanism and can 26 take any action to control temperature. 27 28 29 Threshold management 30 -------------------- 31 Each package will register as a thermal zone under /sys/class/thermal. 32 33 Example:: 34 35 /sys/class/thermal/thermal_zone1 36 37 This contains two trip points: 38 39 - trip_point_0_temp 40 - trip_point_1_temp 41 42 User can set any temperature between 0 to TJ-Max temperature. Temperature units 43 are in milli-degree Celsius. Refer to "Documentation/driver-api/thermal/sysfs-api.rst" for 44 thermal sys-fs details. 45 46 Any value other than 0 in these trip points, can trigger thermal notifications. 47 Setting 0, stops sending thermal notifications. 48 49 Thermal notifications: 50 To get kobject-uevent notifications, set the thermal zone 51 policy to "user_space". 52 53 For example:: 54 55 echo -n "user_space" > policy
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