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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by DS1PEPF00017098.mail.protection.outlook.com (10.167.18.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7544.18 via Frontend Transport; Tue, 7 May 2024 07:16:09 +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; Tue, 7 May 2024 02:16:02 -0500 From: Perry Yuan <perry.yuan@amd.com> To: <rafael.j.wysocki@intel.com>, <Mario.Limonciello@amd.com>, <viresh.kumar@linaro.org>, <Ray.Huang@amd.com>, <gautham.shenoy@amd.com>, <Borislav.Petkov@amd.com> CC: <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 05/11] Documentation: PM: amd-pstate: add debugging section for driver loading failure Date: Tue, 7 May 2024 15:15:21 +0800 Message-ID: <ecc1c5a061859f9b9532e54f2b64d1cb5fd593c4.1715065568.git.perry.yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <cover.1715065568.git.perry.yuan@amd.com> References: <cover.1715065568.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: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF00017098:EE_|IA1PR12MB7543:EE_ X-MS-Office365-Filtering-Correlation-Id: 2eb1dbcb-1ffc-4a10-dc5a-08dc6e6591db X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|376005|82310400017|36860700004|1800799015; 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| Series |
AMD Pstate Driver Fixes and Improvements
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expand
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diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 2695feec1baa..230e236796f7 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -476,6 +476,19 @@ 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 loglevel=4 debug amd_pstate=active" +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(+)