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authorRamkumar Ramachandra <artagnon@gmail.com>2014-01-06 16:54:26 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-01-06 17:35:16 +0400
commitfbe299e0c8c47bf6aea5c426e8ec4b9d34529659 (patch)
treec38cdd20c9572c5ac1790f49ddc3d8bdaa73b191
parentd568b6f71df1c8bd2fc2b051cf03f613a65ffad6 (diff)
downloadlinux-fbe299e0c8c47bf6aea5c426e8ec4b9d34529659.tar.xz
Documentation: add ABI entry for intel_pstate
Add a Documentation/ABI entry for /sys/devices/system/cpu/intel_pstate/max_perf_pct, /sys/devices/system/cpu/intel_pstate/min_perf_pct, and /sys/devices/system/cpu/intel_pstate/no_turbo. Cc: Dirk Brandewie <dirk.brandewie@gmail.com> Cc: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--Documentation/ABI/testing/sysfs-devices-system-cpu24
1 files changed, 24 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 468e4d48f884..d5a0d33c571f 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -200,3 +200,27 @@ Description: address and size of the percpu note.
note of cpu#.
crash_notes_size: size of the note of cpu#.
+
+
+What: /sys/devices/system/cpu/intel_pstate/max_perf_pct
+ /sys/devices/system/cpu/intel_pstate/min_perf_pct
+ /sys/devices/system/cpu/intel_pstate/no_turbo
+Date: February 2013
+Contact: linux-pm@vger.kernel.org
+Description: Parameters for the Intel P-state driver
+
+ Logic for selecting the current P-state in Intel
+ Sandybridge+ processors. The three knobs control
+ limits for the P-state that will be requested by the
+ driver.
+
+ max_perf_pct: limits the maximum P state that will be requested by
+ the driver stated as a percentage of the available performance.
+
+ min_perf_pct: limits the minimum P state that will be requested by
+ the driver stated as a percentage of the available performance.
+
+ no_turbo: limits the driver to selecting P states below the turbo
+ frequency range.
+
+ More details can be found in Documentation/cpu-freq/intel-pstate.txt