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Thu, 10 Nov 2022 17:59:19 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; 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 BN8NAM11FT009.mail.protection.outlook.com (10.13.176.65) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5813.12 via Frontend Transport; Thu, 10 Nov 2022 17:59:19 +0000 Received: from pyuan-Cloudripper.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 15.1.2375.31; Thu, 10 Nov 2022 11:59:16 -0600 From: Perry Yuan To: , , , CC: , , , , , , , , , Perry Yuan Subject: [PATCH v4 2/9] Documentation: amd-pstate: add EPP profiles introduction Date: Fri, 11 Nov 2022 01:58:40 +0800 Message-ID: <20221110175847.3098728-3-Perry.Yuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221110175847.3098728-1-Perry.Yuan@amd.com> References: <20221110175847.3098728-1-Perry.Yuan@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] 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: BN8NAM11FT009:EE_|DS0PR12MB7778:EE_ X-MS-Office365-Filtering-Correlation-Id: 1317a143-6da2-43f0-4c18-08dac3454a9e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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CAT:NONE; SFS:(13230022)(4636009)(376002)(346002)(39860400002)(136003)(396003)(451199015)(40470700004)(36840700001)(46966006)(8936002)(5660300002)(82740400003)(8676002)(41300700001)(7696005)(70586007)(4326008)(2906002)(83380400001)(316002)(36756003)(40460700003)(86362001)(110136005)(54906003)(26005)(40480700001)(82310400005)(478600001)(356005)(81166007)(6666004)(70206006)(16526019)(336012)(47076005)(186003)(1076003)(2616005)(426003)(36860700001)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Nov 2022 17:59:19.7925 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1317a143-6da2-43f0-4c18-08dac3454a9e X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT009.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7778 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The patch add AMD pstate EPP feature introduction and what EPP preference supported for AMD processors. User can get supported list from energy_performance_available_preferences attribute file, or update current profile to energy_performance_preference file 1) See all EPP profiles $ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences default performance balance_performance balance_power power 2) Check current EPP profile $ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference performance 3) Set new EPP profile $ sudo bash -c "echo power > /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference" Signed-off-by: Perry Yuan --- Documentation/admin-guide/pm/amd-pstate.rst | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 8f3d30c5a0d8..e7488891b12f 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -262,6 +262,25 @@ lowest non-linear performance in `AMD CPPC Performance Capability `_.) This attribute is read-only. +``energy_performance_available_preferences`` + +A list of all the supported EPP preferences that could be used for +``energy_performance_preference`` on this system. +These profiles represent different hints that are provided +to the low-level firmware about the user's desired energy vs efficiency +tradeoff. ``default`` represents the epp value is set by platform +firmware. This attribute is read-only. + +``energy_performance_preference`` + +The current energy performance preference can be read from this attribute. +and user can change current preference according to energy or performance needs +Please get all support profiles list from +``energy_performance_available_preferences`` attribute, all the profiles are +integer values defined between 0 to 255 when EPP feature is enabled by platform +firmware, if EPP feature is disabled, driver will ignore the written value +This attribute is read-write. + Other performance and frequency values can be read back from ``/sys/devices/system/cpu/cpuX/acpi_cppc/``, see :ref:`cppc_sysfs`.