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author | Zhang Rui <rui.zhang@intel.com> | 2013-06-18 06:31:26 +0800 |
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committer | Zhang Rui <rui.zhang@intel.com> | 2013-06-18 06:31:26 +0800 |
commit | f157f5964bdc604d8cbf0b71780a0d47ea9f7371 (patch) | |
tree | 8667f1068b026c640cae1a6cb229ca4944c8c3c7 /Documentation | |
parent | 30072fb91e1447b00fa148500c49010265b530c6 (diff) | |
parent | 23be63f48d928cd5a21db58f73c731357e895250 (diff) | |
download | linux-f157f5964bdc604d8cbf0b71780a0d47ea9f7371.tar.gz linux-f157f5964bdc604d8cbf0b71780a0d47ea9f7371.tar.bz2 linux-f157f5964bdc604d8cbf0b71780a0d47ea9f7371.zip |
Merge branch 'cpu-package-thermal' of .git into next
Conflicts:
drivers/thermal/Kconfig
drivers/thermal/Makefile
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/thermal/x86_pkg_temperature_thermal | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/thermal/x86_pkg_temperature_thermal b/Documentation/thermal/x86_pkg_temperature_thermal new file mode 100644 index 000000000000..17a3a4c0a0ca --- /dev/null +++ b/Documentation/thermal/x86_pkg_temperature_thermal @@ -0,0 +1,47 @@ +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 + + + + |