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[v13,8/9] Documentation: cpufreq: amd-pstate: introduce the new cpu boost control method

Message ID 9725dfcbb8848d68ce5c8c099cd3c6805bebf20b.1718988436.git.perry.yuan@amd.com
State New
Headers show
Series AMD Pstate Driver Core Performance Boost | expand

Commit Message

Yuan, Perry June 21, 2024, 4:51 p.m. UTC 
From: Perry Yuan <Perry.Yuan@amd.com>

Introduce AMD CPU frequency boosting control sysfs entry which used for
switching boost on and boost off.

If core performance boost is disabled while a core is in a boosted P-state,
the core automatically transitions to the highest performance non-boosted P-state
The highest perf and frequency will be limited by the setting value.

Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
---
 Documentation/admin-guide/pm/amd-pstate.rst | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
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Patch

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index f5ee81419a93..dc1b10d7dd09 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -440,6 +440,23 @@  control its functionality at the system level.  They are located in the
         This attribute is read-only to check the state of preferred core set
         by the kernel parameter.
 
+``cpb_boost``
+        Specifies whether core performance boost is requested to be enabled or disabled
+        If core performance boost is disabled while a core is in a boosted P-state, the
+        core automatically transitions to the highest performance non-boosted P-state.
+        AMD Core Performance Boost(CPB) is controlled by this attribute file which allows
+        user to change all cores frequency boosting state. It supports all amd-pstate modes.
+
+        States of the driver "/sys/devices/system/cpu/amd_pstate/cpb_boost"
+        "disabled" Core Performance Boosting Disabled.
+        "enabled"  Core Performance Boosting Enabled.
+
+        To enable core performance boost:
+          # echo "enabled" > /sys/devices/system/cpu/amd_pstate/cpb_boost
+
+        To disable core performance boost:
+          # echo "disabled" > /sys/devices/system/cpu/amd_pstate/cpb_boost
+
 ``cpupower`` tool support for ``amd-pstate``
 ===============================================