linux-kernel - [PATCH 7/7] Documentation: cpufreq: amd-pstate: introduce the new cpu boost control method

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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