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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SJ1PEPF00001CDE.mail.protection.outlook.com (10.167.242.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7587.21 via Frontend Transport; Mon, 13 May 2024 02:08:05 +0000 Received: from pyuan-Chachani-VN.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Sun, 12 May 2024 21:08:00 -0500 From: Perry Yuan <perry.yuan@amd.com> To: <Mario.Limonciello@amd.com>, <gautham.shenoy@amd.com>, <Ray.Huang@amd.com>, <Borislav.Petkov@amd.com> CC: <rafael.j.wysocki@intel.com>, <Alexander.Deucher@amd.com>, <Xinmei.Huang@amd.com>, <Xiaojian.Du@amd.com>, <Li.Meng@amd.com>, <linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org> Subject: [PATCH v2 05/10] Documentation: PM: amd-pstate: add debugging section for driver loading failure Date: Mon, 13 May 2024 10:07:23 +0800 Message-ID: <d18eb3b0574de5c93fde348bf14b6548282989c3.1715356532.git.perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <cover.1715356532.git.perry.yuan@amd.com> References: <cover.1715356532.git.perry.yuan@amd.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: <linux-pm.vger.kernel.org> List-Subscribe: <mailto:linux-pm+subscribe@vger.kernel.org> List-Unsubscribe: <mailto:linux-pm+unsubscribe@vger.kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00001CDE:EE_|BY5PR12MB4177:EE_ X-MS-Office365-Filtering-Correlation-Id: 6840d32f-ac07-461a-0e9c-08dc72f186a8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|1800799015|376005|36860700004|82310400017; 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AMD Pstate Driver Fixes and Improvements
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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 --------------
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@amd.com> --- Documentation/admin-guide/pm/amd-pstate.rst | 13 +++++++++++++ 1 file changed, 13 insertions(+)