From patchwork Wed Dec 7 15:46:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wyes Karny X-Patchwork-Id: 13067300 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A06FC63703 for ; Wed, 7 Dec 2022 15:50:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229951AbiLGPuj (ORCPT ); Wed, 7 Dec 2022 10:50:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229872AbiLGPt6 (ORCPT ); Wed, 7 Dec 2022 10:49:58 -0500 Received: from NAM11-CO1-obe.outbound.protection.outlook.com (mail-co1nam11on2082.outbound.protection.outlook.com [40.107.220.82]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01F9E5D690; Wed, 7 Dec 2022 07:49:58 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=IpIAnjDJ3WjWy3BSS3GMVXOAccUUMZ/6OswVjHcW5rjWqJE43+xjIOOXku2Lw/aPlIpMQs8WhQCu/EYgiJOoSt0OIR4R7Et292ume416kZ9f0rg+cJOxfl+NPjRSUj/X6zyXBKZTsLMxcIUrZwmGeCO5GMh0CyzNmWa7Bk6SkRS37fr55SrCVj7Jv0KvupYKJn4S1i2hwBCjcVSDN7+/Znht9jCKx2Avnk+7nsGcW4OJX1ydOM5zaEP3a7OXnRQj0JkKD37ZR/3XVCFJB99yoQDvP8xCdtMEDJCHrSq5hBmPSbYmipqM42XAM1jghPKN6AOvFkBoBXFXvtaHf7mI+w== 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=tdTCKrYg4Vocmoj1X2D2pS5MTAwtyjEWaMTIrs2/9Fs=; b=mdZk+yT3heE2Ux+tT4WakgZjb2ATb5yszd1IDCB28y1bKlwKid8UAS4UrJpzbz9K3NdpV5vdMy73Q2EVlNlfNhhFAIhRrwL9z9+eO0rTy75kRqDSq6o8HID7QJiBuNrASEVSc9EWIsOqn/uyEyVV3IprWKrETtQMs8mPh2V5Hebek0DHUBEmZrZO2vbK7hC/6yp3fg9ApoTn0XP+44fPRUMOt/qmwdEBvkaz5f//dU4Pz/zbcWrgVwVm1pB+fnBcdgOg7mkb7rawJ4uXqr5pPjX3/biG2Cp2orNYF81i9oluXz1MvI3dyN69ChksPamNZNMX9VgLEYb4Pe+8ierIGw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=vger.kernel.org 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=tdTCKrYg4Vocmoj1X2D2pS5MTAwtyjEWaMTIrs2/9Fs=; b=P9KQHibSNLgJYOpp0vP13j3fi6ba5PhuZuk1o9iGYsBEXhxqiU4MFnJqI3jeJZOF+okwgvFXTZDPGVGzgmPh/pejDPRHJhH9GjjZWGMlZ5GNV6noJFA5pWi2AQQ/cCJ8omvF2G2n9kb+cmpdFkOOAlxPW3TRIAYE4n4lXDrnfVo= Received: from BN8PR04CA0049.namprd04.prod.outlook.com (2603:10b6:408:d4::23) by MW5PR12MB5649.namprd12.prod.outlook.com (2603:10b6:303:19d::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5880.14; Wed, 7 Dec 2022 15:49:56 +0000 Received: from BN8NAM11FT073.eop-nam11.prod.protection.outlook.com (2603:10b6:408:d4:cafe::b3) by BN8PR04CA0049.outlook.office365.com (2603:10b6:408:d4::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5880.14 via Frontend Transport; Wed, 7 Dec 2022 15:49:55 +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 BN8NAM11FT073.mail.protection.outlook.com (10.13.177.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5901.16 via Frontend Transport; Wed, 7 Dec 2022 15:49:55 +0000 Received: from beas.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 15.1.2375.34; Wed, 7 Dec 2022 09:49:50 -0600 From: Wyes Karny To: , , CC: Jonathan Corbet , Huang Rui , "Rafael J . Wysocki" , Viresh Kumar , , , Ananth Narayan , , Wyes Karny Subject: [PATCH 4/4] Documentation: amd_pstate: Add amd_pstate state sysfs file Date: Wed, 7 Dec 2022 15:46:48 +0000 Message-ID: <20221207154648.233759-5-wyes.karny@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221207154648.233759-1-wyes.karny@amd.com> References: <20221207154648.233759-1-wyes.karny@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: BN8NAM11FT073:EE_|MW5PR12MB5649:EE_ X-MS-Office365-Filtering-Correlation-Id: 10d2e681-5b36-4222-592b-08dad86ab00b 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:(13230022)(4636009)(39860400002)(346002)(396003)(136003)(376002)(451199015)(40470700004)(46966006)(36840700001)(478600001)(82740400003)(36860700001)(356005)(2616005)(2906002)(81166007)(7696005)(26005)(44832011)(5660300002)(83380400001)(82310400005)(47076005)(36756003)(16526019)(336012)(186003)(86362001)(41300700001)(40460700003)(426003)(54906003)(110136005)(316002)(1076003)(8936002)(4326008)(8676002)(40480700001)(70586007)(70206006)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Dec 2022 15:49:55.7544 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 10d2e681-5b36-4222-592b-08dad86ab00b 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: BN8NAM11FT073.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW5PR12MB5649 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Add documentation for amd_pstate `state` interface. User can see the current state of the driver with the help of this sysfs interface: # cat /sys/devices/system/cpu/amd_pstate/state # disable [passive] guided User can load/unload driver with the help of `state` sysfs interface. - Load driver with passive mode: # echo passive > /sys/devices/system/cpu/amd_pstate/state - Unload the driver: # echo disable > /sys/devices/system/cpu/amd_pstate/state - To switch to guided mode: # echo guided > /sys/devices/system/cpu/amd_pstate/state Signed-off-by: Wyes Karny --- Documentation/admin-guide/pm/amd-pstate.rst | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 06e23538f79c..4d3783516ddc 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -265,6 +265,17 @@ This attribute is read-only. Other performance and frequency values can be read back from ``/sys/devices/system/cpu/cpuX/acpi_cppc/``, see :ref:`cppc_sysfs`. +``state`` + +``amd_pstate`` also exposes a sysfs interface to view and control the driver state. +The driver state can be one of the following: +``disable`` : indicates driver is in unloaded state. +``passive`` : indicates driver is loaded and currently in passive mode. +``guided`` : indicates driver is loaded and currenlty in guided autonomous mode. +This file can be found here: ``/sys/devices/system/cpu/amd_pstate/state``. + +To switch to passive mode: ``echo passive > /sys/devices/system/cpu/amd_pstate/state`` +To switch to guided mode: ``echo guided > /sys/devices/system/cpu/amd_pstate/state`` ``amd-pstate`` vs ``acpi-cpufreq`` ======================================