linux-kernel - [PATCH v4 05/11] Documentation: PM: amd-pstate: add debugging section for driver loading failure

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Message-ID: <ce88d442ba6398853ac63351107e0028ef659660.1718606975.git.perry.yuan@amd.com>
Date: Mon, 17 Jun 2024 14:59:07 +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 v4 05/11] Documentation: PM: amd-pstate: add debugging section for driver loading failure

To address issues with the loading of the amd-pstate driver on certain platforms,
It needs to enable dynamic debugging to capture debug messages during the driver
loading process. By adding "amd_pstate.dyndbg=+p cppc_acpi.dyndbg=+p  debug
amd_pstate=active" and loglevel to the kernel command line, then driver debug
logging is enabled.

Signed-off-by: Perry Yuan <perry.yuan@....com>
---
 Documentation/admin-guide/pm/amd-pstate.rst | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index 1e0d101b020a..ceeb073c9ada 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -472,6 +472,20 @@ operations for the new ``amd-pstate`` module with this tool. ::
 Diagnostics and Tuning
 =======================
 
+Debugging AMD P-State Driver Loading Issues
+------------------------------------------
+
+If the amd-pstate driver fails to load, additional debug information
+may be necessary.
+To capture debug messages for issue analysis, users can add below parameter,
+"amd_pstate.dyndbg=+p cppc_acpi.dyndbg=+p debug"
+to the kernel command line. This will enable dynamic debugging and allow better
+analysis and troubleshooting of the driver loading process.
+
+Please note that adding this parameter will only enable debug logging during the
+driver loading phase and may affect system behavior. Use this option with caution
+and only for debugging purposes.
+
 Trace Events
 --------------
 
-- 
2.34.1