[PATCH v5 6/8] Documentation: cpufreq: amd-pstate: introduce the new cpu boost control method

Perry Yuan
2024-03-15T03:39:39Z

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>
---
Documentation/admin-guide/pm/amd-pstate.rst | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index 1e0d101b020a..82fbd01da658 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -440,6 +440,17 @@ 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 new attribute file which
+ allow user to change all cores frequency boosting state. It supports both
+ ``active``, ``passive`` and ``guided`` mode control with below value write to it.
+
+ "0" Disable Core Performance Boosting
+ "1" Enable Core Performance Boosting
+
``cpupower`` tool support for ``amd-pstate``
===============================================

--
2.34.1