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Message-ID: <1be9c97cafb1406a607184ea48dcdae883dc4cd0.1706255676.git.perry.yuan@amd.com>
Date: Fri, 26 Jan 2024 16:08:10 +0800
From: Perry Yuan <perry.yuan@....com>
To: <rafael.j.wysocki@...el.com>, <Mario.Limonciello@....com>,
<viresh.kumar@...aro.org>, <Ray.Huang@....com>, <gautham.shenoy@....com>,
<Borislav.Petkov@....com>
CC: <Alexander.Deucher@....com>, <Xinmei.Huang@....com>,
<Xiaojian.Du@....com>, <Li.Meng@....com>, <linux-pm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH 7/7] Documentation: cpufreq: amd-pstate: introduce the new cpu boost control method
From: Perry Yuan <Perry.Yuan@....com>
Introduce AMD CPU frequency boosting control sysfs entry which userd 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@....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 1cf40f69278c..d72dc407c4db 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -385,6 +385,17 @@ control its functionality at the system level. They are located in the
to the operation mode represented by that string - or to be
unregistered in the "disable" case.
+``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 mode`` and ``passive 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
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