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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
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