From patchwork Fri Jun 21 16:51:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Yuan, Perry" X-Patchwork-Id: 13707861 X-Patchwork-Delegate: mario.limonciello@amd.com Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2058.outbound.protection.outlook.com [40.107.244.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F25FD168491; Fri, 21 Jun 2024 16:51:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.244.58 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718988709; cv=fail; b=QzNr2li9/7B14a1F/FXqFViO7l7wGqGfxmyq/Q1lFXZdEQiXCk/7xVtXoGJbjh36iregqPnIh8j/KK9IqClAzr71h/w8lZM5JnCRFhjTospaEEuhYr3q3WgK0w0A2vHUCXKm2gtCNRvobnh6qVUYpIsCQLC/DZugZexLCMF/Do0= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718988709; c=relaxed/simple; bh=pMBC6gxUeoOjPn4k+KS51ROO1oYl4S4hlfOolztnRO8=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=fsDw6k+WfUWNDx8F+OwkQ4n+5lzV10V7mwKYPgGH6dHDtusu2T1dhK8p9Nex8ZiOQ5SXgahpMtHd8bxpXIpR6dAhfdRaSaojn9/OYQ9gOsfrgF0lmrBbUVWLMcsvavQayrZPKYhirKdo6d7tm3MudH+nJAkq5zC52gRHk8faFWg= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=S0uL4Pcv; arc=fail smtp.client-ip=40.107.244.58 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="S0uL4Pcv" ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=dO1Zu7P6Pm1HEjMyeYKLkR1HD74ckZ38bA6XrEFYQTlAeqwAYJqYh9nHa2w8PuI2lL/suJ+f20qlZZkGLan+9lvm/nlf+dpMP9JMOQ/plLiVe9dc7PGXG5FjZ8D71SFC1FuiY2GV3DxnHXBU1npncFmTGU4uxzjO9ybiDaEtO+fMF16Rg0h3jjyOPZyIotQN1IZX0DVgaqJaZqA9cA5hGwhUU9FBjce1VhDY8RdvQKAEkGLQN0rNWfLi8jhf6Fx/dVes8f12LEvPrlYwy/L/3DtrR97Cf1s+C2+IxLm+BtzqiKjYixK5ah4P09XO/Fg1CsZ+0ewW2GIbeYbxe/MytA== 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=Ovj6wbQK5jpoaNgpuE5BxXhP7O8BSr/ouZVyWoC8UOE=; b=fBMg6Kf7tNcos/4y34ItJTV0d4Hldn7EKXG4vIAa8U+vT/NrQOejnSjxPjx26HOyFT8/CtPYUN9J03RtXVex1RifybRy66gXiycceE/FQQhDkgmCvnfNm+wG+vrD+0mdjpea/eoPSgwqGgkp9mGOotYI+S0VyGRc0kLSge4hr+MB9mCVLcl2G92QLBQ14CHcMd2abgwX0pvHZQVcLO1Beb0lIeRbk5cegm1lSlIC2y+PnBddbkGDacn9iC+Vatbb937bADfCuqc6MWm1ktr4bsTLY4RSRUCFxGmibe3MZRrmAOM4nBE1uySBfmpI/oNSVmeldXrbUgEnf2LPn+emlw== 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 (0) 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=Ovj6wbQK5jpoaNgpuE5BxXhP7O8BSr/ouZVyWoC8UOE=; b=S0uL4Pcv+OAaGzj4Tv5U7IxA1rdS9DFovfbEjLhJaiRMmoRBDySXgX/uQ4sZMfCeO/l14gEIJVCsPes0mNbQZw7WZOX7lGxJhqnKharzy6Rcb9KfcIBRvrNLFD3trS1Hhy+q5kX5MkC/QkomPA6X1/Wl6pnVykw6TyhIKpIJstw= Received: from SJ0PR03CA0165.namprd03.prod.outlook.com (2603:10b6:a03:338::20) by PH8PR12MB6889.namprd12.prod.outlook.com (2603:10b6:510:1c9::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7698.21; Fri, 21 Jun 2024 16:51:45 +0000 Received: from SJ5PEPF000001F5.namprd05.prod.outlook.com (2603:10b6:a03:338:cafe::4b) by SJ0PR03CA0165.outlook.office365.com (2603:10b6:a03:338::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7677.32 via Frontend Transport; Fri, 21 Jun 2024 16:51:45 +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 SJ5PEPF000001F5.mail.protection.outlook.com (10.167.242.73) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7677.15 via Frontend Transport; Fri, 21 Jun 2024 16:51:45 +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 15.1.2507.39; Fri, 21 Jun 2024 11:51:42 -0500 From: Perry Yuan To: , , , CC: , , , , , Subject: [PATCH v13 9/9] Documentation: cpufreq: amd-pstate: update doc for Per CPU boost control method Date: Sat, 22 Jun 2024 00:51:04 +0800 Message-ID: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: SJ5PEPF000001F5:EE_|PH8PR12MB6889:EE_ X-MS-Office365-Filtering-Correlation-Id: a4858824-2278-4999-af2d-08dc92126f71 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230037|1800799021|82310400023|376011|36860700010; 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:(13230037)(1800799021)(82310400023)(376011)(36860700010);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jun 2024 16:51:45.4993 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a4858824-2278-4999-af2d-08dc92126f71 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: SJ5PEPF000001F5.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB6889 Updates the documentation in `amd-pstate.rst` to include information about the per CPU boost control feature. Users can now enable or disable the Core Performance Boost (CPB) feature on individual CPUs using the `boost` sysfs attribute. Signed-off-by: Perry Yuan Reviewed-by: Mario Limonciello --- Documentation/admin-guide/pm/amd-pstate.rst | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index dc1b10d7dd09..57995f54f0c8 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -281,6 +281,27 @@ 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. +``boost`` +The `boost` sysfs attribute provides control over the CPU core +performance boost, allowing users to manage the maximum frequency limitation +of the CPU. This attribute can be used to enable or disable the boost feature +on individual CPUs. + +When the boost feature is enabled, the CPU can dynamically increase its frequency +beyond the base frequency, providing enhanced performance for demanding workloads. +On the other hand, disabling the boost feature restricts the CPU to operate at the +base frequency, which may be desirable in certain scenarios to prioritize power +efficiency or manage temperature. + +To manipulate the `boost` attribute, users can write a value of `0` to disable the +boost or `1` to enable it, for the respective CPU using the sysfs path +`/sys/devices/system/cpu/cpuX/cpufreq/boost`, where `X` represents the CPU number. + +It is important to note that modifying the global variable +`/sys/devices/system/cpu/amd_pstate/cpb_boost` will override the individual CPU +settings. + + Other performance and frequency values can be read back from ``/sys/devices/system/cpu/cpuX/acpi_cppc/``, see :ref:`cppc_sysfs`.