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authorJiri Kosina <jkosina@suse.cz>2013-07-25 12:30:27 +0200
committerJiri Kosina <jkosina@suse.cz>2013-07-25 12:30:49 +0200
commita3f8612700507a10ad7186fd77e9f46c7af88335 (patch)
treef00be0b726748113ffeb4e1caf7ade7ef33cfabe /Documentation/thermal/x86_pkg_temperature_thermal
parentdoc: printk-formats: fix format specifier to %p[Ii]4[hnbl] (diff)
parentMerge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc (diff)
downloadlinux-dev-a3f8612700507a10ad7186fd77e9f46c7af88335.tar.xz
linux-dev-a3f8612700507a10ad7186fd77e9f46c7af88335.zip
Merge branch 'master' into for-next
Sync with Linus' master to be able to apply trivial patche to newer code. Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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+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
+
+
+
+