From c0b799f626defe725957ea28aa452e3460eecde6 Mon Sep 17 00:00:00 2001 From: Fenghua Yu Date: Thu, 29 Jul 2010 17:13:46 -0700 Subject: [PATCH] --- yaml --- r: 205466 b: refs/heads/master c: a3159864f2978bf2ace9cc787d73d315c98bbf9a h: refs/heads/master v: v3 --- [refs] | 2 +- trunk/Documentation/hwmon/pkgtemp | 36 +++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+), 1 deletion(-) create mode 100644 trunk/Documentation/hwmon/pkgtemp diff --git a/[refs] b/[refs] index 73bd12f34f53..694ad9e829dc 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: 0199114c31798af5b83841b21759b64171060d9b +refs/heads/master: a3159864f2978bf2ace9cc787d73d315c98bbf9a diff --git a/trunk/Documentation/hwmon/pkgtemp b/trunk/Documentation/hwmon/pkgtemp new file mode 100644 index 000000000000..c8e1fb0fadd3 --- /dev/null +++ b/trunk/Documentation/hwmon/pkgtemp @@ -0,0 +1,36 @@ +Kernel driver pkgtemp +====================== + +Supported chips: + * Intel family + Prefix: 'pkgtemp' + CPUID: + Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual + Volume 3A: System Programming Guide + +Author: Fenghua Yu + +Description +----------- + +This driver permits reading package level temperature sensor embedded inside +Intel CPU package. The sensors can be in core, uncore, memory controller, or +other components in a package. The feature is first implemented in Intel Sandy +Bridge platform. + +Temperature is measured in degrees Celsius and measurement resolution is +1 degree C. Valid temperatures are from 0 to TjMax degrees C, because the actual +value of temperature register is in fact a delta from TjMax. + +Temperature known as TjMax is the maximum junction temperature of package. +We get this from MSR_IA32_TEMPERATURE_TARGET. If the MSR is not accessible, +we define TjMax as 100 degrees Celsius. At this temperature, protection +mechanism will perform actions to forcibly cool down the package. Alarm +may be raised, if the temperature grows enough (more than TjMax) to trigger +the Out-Of-Spec bit. Following table summarizes the exported sysfs files: + +temp1_input - Package temperature (in millidegrees Celsius). +temp1_max - All cooling devices should be turned on. +temp1_crit - Maximum junction temperature (in millidegrees Celsius). +temp1_crit_alarm - Set when Out-of-spec bit is set, never clears. + Correct CPU operation is no longer guaranteed.