From patchwork Mon Oct 9 02:49:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Meng Li X-Patchwork-Id: 149816 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:a888:0:b0:403:3b70:6f57 with SMTP id x8csp1621875vqo; Sun, 8 Oct 2023 19:51:16 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFeJuxYSuEnPWhNjpZyDV6HSMHK7pPgEPZZocnSzDB/ZlaL2yvj3hS3S1ct1+WvMeOTeyrk X-Received: by 2002:a54:4602:0:b0:3ad:f536:2f26 with SMTP id p2-20020a544602000000b003adf5362f26mr14626548oip.18.1696819876757; Sun, 08 Oct 2023 19:51:16 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1696819876; cv=pass; d=google.com; s=arc-20160816; b=0en4xeumCyhEuyS0omC8Jl0CQU1bnmOU2apvLGlkt9RYLx1kb8UzBthVNSA8WI1Oxf VsYX1Qsmi5dsXvNg6/S2eMA4LgxedBfiAA7G8GH4+n2fdVGay1zWUfI11yGxA+KeKyni p+7aJ2AoOmpmItEUwthY9nBlkN63qxDGz5kI713MvYFLW7r5jHYN7ue7fZ5LqfTbsX1e j2wadkUfGoQ21kUnid9nc7h3pPCP/ZXqJZlNKUJSf1cCaVjYsT0//hCRgkJRA7LZxdrL u4+KzLbtKmSbXUY1+F2jIiF0c4+N2d+7cXNu+mSD768h4YqWq1n7SivfNJ/bP5/0xzYd Wl6g== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=9OK1yS43YQ3sOBQqS3fVNjmQ7kYIlNFL+i2jNaV7o10=; fh=Ux3YgDYVPXDd/Bh2648Da5vJU6LEkGipfecwSr9Umfo=; b=AHRkbLWDo788GQDFJkmztn4Y2xYAh6+PbLD/Q1XNfD9yoyro1oJY6zK2U7Gauxejq0 K4z3TA8JKcG1iqZ4pPqz+wCjQjf/7wkHM0GHahojw0pBiOTjO6hyq+KTKiFDPWZPr7Mn JFAU6fmpiINU83l4ha2PJNlR93Nb5o3ERxRw6iXUzLYu21ga3o6dE5prmHbkFm197A1W 4dvCkLtjK2Yv5pU/sIYZ0UFXFBn6/wYbVOEPgPFhYM9p7yEmMs3pg33IuzNYCLCEoPNo +bvzq09yCn++8yADSrmOMah7JtHxRqENI2fR53bOfZnYeZShpYVPikjmTeQ8bP+4cUh/ ve+Q== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@amd.com header.s=selector1 header.b=EPw2AIfz; arc=pass (i=1 spf=pass spfdomain=amd.com dmarc=pass fromdomain=amd.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amd.com Received: from snail.vger.email (snail.vger.email. [23.128.96.37]) by mx.google.com with ESMTPS id k190-20020a6384c7000000b0057c24bae994si8714224pgd.355.2023.10.08.19.51.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Oct 2023 19:51:16 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) client-ip=23.128.96.37; Authentication-Results: mx.google.com; dkim=pass header.i=@amd.com header.s=selector1 header.b=EPw2AIfz; arc=pass (i=1 spf=pass spfdomain=amd.com dmarc=pass fromdomain=amd.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amd.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by snail.vger.email (Postfix) with ESMTP id AB32A80408CA; Sun, 8 Oct 2023 19:51:15 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at snail.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345073AbjJICvJ (ORCPT + 19 others); Sun, 8 Oct 2023 22:51:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345066AbjJICvB (ORCPT ); Sun, 8 Oct 2023 22:51:01 -0400 Received: from NAM04-BN8-obe.outbound.protection.outlook.com (mail-bn8nam04on2044.outbound.protection.outlook.com [40.107.100.44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC3F1F1; Sun, 8 Oct 2023 19:50:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=P5mjqGb1RzA34vc/x6B2DPqMnn2PKmOFHqlmQVRQj2Sl9YrHzXi3iBei0Xf3d9HqLQ0MIqQJDUZ0lxVf1cxf/+IwHxwtDn6XYOM6aN4qtedMQPw8Au6keDGKgfkbcZuCPXd1rjUzfXu7/iTZcrsPpcLaah9ug+qYSJXmX1cOgamWW85llRPlXGy5uVz/33doIzEqBozTI+6+F8RBv5z/dDmgiwp+Ey83nOyqR79ayaAWveK7O67lKmp3zjGeNfLNiXTnk14KCju85U6tutgPrf/o0mdQz3Kgh29uCMjWuZJ4hxCnXk6uLbF2FvF4qKgWKorBr6abLlwYG6yqQM+sxQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=9OK1yS43YQ3sOBQqS3fVNjmQ7kYIlNFL+i2jNaV7o10=; b=NIXqDndpDYCzS2j72swvaNf2ikWHea685cdKkz0GH/zfJ3N0vsflLUh13yM9LolCu0e2Sa2iZBRpBq9662kiVUhMyH3792drkEcytt4rjC42i72tfjr36vbXS6A22QyaY6nNh68UEbMWSZH4C/BVmO7ww6EbpgWZumdd4pyJV6Tq6tw3FAsw9ryVQ9BLrjHvrGl8uxCQHjdm9pPJ/jQsiJa4neHSxqPfQq7GvicuK/2dcgG1E/+9qWPFJGva9ErhZenOKDGFFffS5nZF9W8D/tBQx0S/1y/weWdK7fzik8fVs74m+8nQuYgu0KIAQU5Ez7hLxQ3RAdbfM3NwDUuxxA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=intel.com smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=9OK1yS43YQ3sOBQqS3fVNjmQ7kYIlNFL+i2jNaV7o10=; b=EPw2AIfzUqUkCMl1TYra8mmwxWgfujDzUNdXjyQLO/CVMmICMaCrAzUcW6c6p6eN3aMal5kO9HhIh7mH7EPiflqk/gvmDylIFcAzJevf82h0JqJQgmt+tSef4nwdLzre2+7lY9r98J1iHm7uM/cdA3f4ZDAwaRinOLzjLTQgqqM= Received: from MN2PR05CA0006.namprd05.prod.outlook.com (2603:10b6:208:c0::19) by PH7PR12MB8828.namprd12.prod.outlook.com (2603:10b6:510:26b::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6838.43; Mon, 9 Oct 2023 02:50:55 +0000 Received: from BL6PEPF0001AB51.namprd04.prod.outlook.com (2603:10b6:208:c0:cafe::86) by MN2PR05CA0006.outlook.office365.com (2603:10b6:208:c0::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6886.20 via Frontend Transport; Mon, 9 Oct 2023 02:50:55 +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 BL6PEPF0001AB51.mail.protection.outlook.com (10.167.242.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6838.14 via Frontend Transport; Mon, 9 Oct 2023 02:50:54 +0000 Received: from jasmine-meng.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 15.1.2507.27; Sun, 8 Oct 2023 21:50:49 -0500 From: Meng Li To: "Rafael J . Wysocki" , Huang Rui CC: , , , , Shuah Khan , , "Nathan Fontenot" , Deepak Sharma , Alex Deucher , Mario Limonciello , Shimmer Huang , "Perry Yuan" , Xiaojian Du , Viresh Kumar , Borislav Petkov , Meng Li Subject: [PATCH V8 6/7] Documentation: amd-pstate: introduce amd-pstate preferred core Date: Mon, 9 Oct 2023 10:49:31 +0800 Message-ID: <20231009024932.2563622-7-li.meng@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231009024932.2563622-1-li.meng@amd.com> References: <20231009024932.2563622-1-li.meng@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: BL6PEPF0001AB51:EE_|PH7PR12MB8828:EE_ X-MS-Office365-Filtering-Correlation-Id: 0c90555f-8308-4450-d7b9-08dbc8728e76 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(136003)(39860400002)(376002)(396003)(346002)(230922051799003)(64100799003)(1800799009)(82310400011)(451199024)(186009)(46966006)(40470700004)(36840700001)(2616005)(1076003)(16526019)(426003)(336012)(26005)(54906003)(70586007)(70206006)(110136005)(6636002)(2906002)(83380400001)(40460700003)(86362001)(36756003)(47076005)(36860700001)(7696005)(6666004)(478600001)(5660300002)(8676002)(8936002)(4326008)(316002)(41300700001)(81166007)(40480700001)(356005)(82740400003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Oct 2023 02:50:54.4724 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0c90555f-8308-4450-d7b9-08dbc8728e76 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: BL6PEPF0001AB51.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB8828 X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Sun, 08 Oct 2023 19:51:15 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1779244599116536172 X-GMAIL-MSGID: 1779244599116536172 Introduce amd-pstate preferred core. check preferred core state set by the kernel parameter: $ cat /sys/devices/system/cpu/amd-pstate/prefcore Reviewed-by: Mario Limonciello Reviewed-by: Huang Rui Signed-off-by: Meng Li Reviewed-by: Wyes Karny --- Documentation/admin-guide/pm/amd-pstate.rst | 59 ++++++++++++++++++++- 1 file changed, 57 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 1cf40f69278c..0b832ff529db 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -300,8 +300,8 @@ platforms. The AMD P-States mechanism is the more performance and energy efficiency frequency management method on AMD processors. -AMD Pstate Driver Operation Modes -================================= +``amd-pstate`` Driver Operation Modes +====================================== ``amd_pstate`` CPPC has 3 operation modes: autonomous (active) mode, non-autonomous (passive) mode and guided autonomous (guided) mode. @@ -353,6 +353,48 @@ is activated. In this mode, driver requests minimum and maximum performance level and the platform autonomously selects a performance level in this range and appropriate to the current workload. +``amd-pstate`` Preferred Core +================================= + +The core frequency is subjected to the process variation in semiconductors. +Not all cores are able to reach the maximum frequency respecting the +infrastructure limits. Consequently, AMD has redefined the concept of +maximum frequency of a part. This means that a fraction of cores can reach +maximum frequency. To find the best process scheduling policy for a given +scenario, OS needs to know the core ordering informed by the platform through +highest performance capability register of the CPPC interface. + +``amd-pstate`` preferred core enables the scheduler to prefer scheduling on +cores that can achieve a higher frequency with lower voltage. The preferred +core rankings can dynamically change based on the workload, platform conditions, +thermals and ageing. + +The priority metric will be initialized by the ``amd-pstate`` driver. The ``amd-pstate`` +driver will also determine whether or not ``amd-pstate`` preferred core is +supported by the platform. + +``amd-pstate`` driver will provide an initial core ordering when the system boots. +The platform uses the CPPC interfaces to communicate the core ranking to the +operating system and scheduler to make sure that OS is choosing the cores +with highest performance firstly for scheduling the process. When ``amd-pstate`` +driver receives a message with the highest performance change, it will +update the core ranking and set the cpu's priority. + +``amd-pstate`` Preferred Core Switch +================================= +Kernel Parameters +----------------- + +``amd-pstate`` peferred core`` has two states: enable and disable. +Enable/disable states can be chosen by different kernel parameters. +Default enable ``amd-pstate`` preferred core. + +``amd_prefcore=disable`` + +For systems that support ``amd-pstate`` preferred core, the core rankings will +always be advertised by the platform. But OS can choose to ignore that via the +kernel parameter ``amd_prefcore=disable``. + User Space Interface in ``sysfs`` - General =========================================== @@ -385,6 +427,19 @@ control its functionality at the system level. They are located in the to the operation mode represented by that string - or to be unregistered in the "disable" case. +``prefcore`` + Preferred core state of the driver: "enabled" or "disabled". + + "enabled" + Enable the ``amd-pstate`` preferred core. + + "disabled" + Disable the ``amd-pstate`` preferred core + + + This attribute is read-only to check the state of preferred core set + by the kernel parameter. + ``cpupower`` tool support for ``amd-pstate`` ===============================================