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authorDurgadoss R <durgadoss.r@intel.com>2011-05-20 01:29:35 +0530
committerGuenter Roeck <guenter.roeck@ericsson.com>2011-05-20 07:04:49 -0700
commit199e0de7f5df31a4fc485d4aaaf8a07718252ace (patch)
treed06b8b4d5758dc2e2a4caa45f7045bea34969987 /Documentation
parent83f7649c52871d4b0799c209c364374b682fa4a8 (diff)
hwmon: (coretemp) Merge pkgtemp with coretemp
This patch merges the pkgtemp with coretemp driver. The sysfs interfaces for all cores in the same pkg are shown under one directory, in hwmon. It also supports CONFIG_HOTPLUG_CPU. So, the sysfs interfaces are created when each core comes online and are removed when it goes offline. Signed-off-by: Durgadoss R <durgadoss.r@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> [guenter.roeck@ericsson.com: Fixed section reference errors] Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/hwmon/coretemp21
1 files changed, 14 insertions, 7 deletions
diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp
index 25568f844804..f85e913a3401 100644
--- a/Documentation/hwmon/coretemp
+++ b/Documentation/hwmon/coretemp
@@ -15,8 +15,13 @@ Author: Rudolf Marek
Description
-----------
+This driver permits reading the DTS (Digital Temperature Sensor) embedded
+inside Intel CPUs. This driver can read both the per-core and per-package
+temperature using the appropriate sensors. The per-package sensor is new;
+as of now, it is present only in the SandyBridge platform. The driver will
+show the temperature of all cores inside a package under a single device
+directory inside hwmon.
-This driver permits reading temperature sensor embedded inside Intel Core CPU.
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.
@@ -27,13 +32,15 @@ mechanism will perform actions to forcibly cool down the processor. 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 - Core temperature (in millidegrees Celsius).
-temp1_max - All cooling devices should be turned on (on Core2).
-temp1_crit - Maximum junction temperature (in millidegrees Celsius).
-temp1_crit_alarm - Set when Out-of-spec bit is set, never clears.
+All Sysfs entries are named with their core_id (represented here by 'X').
+tempX_input - Core temperature (in millidegrees Celsius).
+tempX_max - All cooling devices should be turned on (on Core2).
+tempX_crit - Maximum junction temperature (in millidegrees Celsius).
+tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
Correct CPU operation is no longer guaranteed.
-temp1_label - Contains string "Core X", where X is processor
- number.
+tempX_label - Contains string "Core X", where X is processor
+ number. For Package temp, this will be "Physical id Y",
+ where Y is the package number.
The TjMax temperature is set to 85 degrees C if undocumented model specific
register (UMSR) 0xee has bit 30 set. If not the TjMax is 100 degrees C as