linux-kernel - [PATCH v2 05/10] Documentation: PM: amd-pstate: add debugging section for driver loading failure

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Date: Mon, 13 May 2024 10:07:23 +0800
From: Perry Yuan <perry.yuan@....com>
To: <Mario.Limonciello@....com>, <gautham.shenoy@....com>,
	<Ray.Huang@....com>, <Borislav.Petkov@....com>
CC: <rafael.j.wysocki@...el.com>, <Alexander.Deucher@....com>,
	<Xinmei.Huang@....com>, <Xiaojian.Du@....com>, <Li.Meng@....com>,
	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 05/10] 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  loglevel=4 debug
amd_pstate=active" to the kernel command line, driver debug logging is enabled.

Signed-off-by: Perry Yuan <perry.yuan@....com>
---
 Documentation/admin-guide/pm/amd-pstate.rst | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index 1e0d101b020a..de83e742738e 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -472,6 +472,19 @@ operations for the new ``amd-pstate`` module with this tool. ::
 Diagnostics and Tuning
 =======================
 
+Debugging AMD P-State Driver Loading Issues
+------------------------------------------
+
+On some platforms, there may be issues with the loading of the amd-pstate driver.
+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