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Message-ID: <d18eb3b0574de5c93fde348bf14b6548282989c3.1715356532.git.perry.yuan@amd.com> 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
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