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List:       linux-edac
Subject:    =?UTF-8?q?=5BPATCH=203/3=5D=20Thermal=3A=20Documentation=20for=20x86=20package=20temperature=20therm
From:       Srinivas Pandruvada <srinivas.pandruvada () linux ! intel ! com>
Date:       2013-05-17 23:42:03
Message-ID: 1368834123-9591-4-git-send-email-srinivas.pandruvada () linux ! intel ! com
[Download RAW message or body]

Added documentation describing details of the x86 package temperature
thermal driver.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 Documentation/thermal/x86_pkg_temperature_thermal | 47 +++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Documentation/thermal/x86_pkg_temperature_thermal

diff --git a/Documentation/thermal/x86_pkg_temperature_thermal \
b/Documentation/thermal/x86_pkg_temperature_thermal new file mode 100644
index 0000000..17a3a4c
--- /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
+
+
+
+
-- 
1.7.11.7

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