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Message-ID: <b8e4048f2e7ec7bc9546537a208ab558da1a07b3.1707297581.git.perry.yuan@amd.com>
Date: Wed, 7 Feb 2024 17:21:56 +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 v3 5/7] 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 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@....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 0a3aa6b8ffd5..fcf5b75a5341 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
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