From nobody Sun Feb 8 11:26:14 2026 Received: from BYAPR05CU005.outbound.protection.outlook.com (mail-westusazon11010047.outbound.protection.outlook.com [52.101.85.47]) (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 5007741C2F9; Fri, 6 Feb 2026 14:28:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.85.47 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770388131; cv=fail; b=sCnmDFd4zthnLJWG9aTLm59l61K2QK+6fIrWzP5EygHukurwOPk2RBoHN/BaR28knmRGHxp0i0ZSivcpi37WcPab40tXxc23fR8Wmw72x1mZ3aKKxulcT5obYWIRcrKEQ2RkjmOya/4LeZEIFRr1/j5hhpyQq7sXYDw3Bcf4x3U= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770388131; c=relaxed/simple; bh=WoFEsz8qAarwMMNeP1B3gn7PRI97qF66i8DKREJfwfk=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=XAXhBuKwJheo8WZuUkOl8o5QUzhsEoi0bT085s2pnvI6f0Vw3jRNX15p5Hx1sZsVNBV7dxNfrtpqNjpk/xo0oX3OZOQYvHLsJkWma/v43j79g5H9cNLSqnu3lAclBP2NXbRNMwRdUcSj1OT+gcM3EzPwuvk7Y60183HW9C11y2k= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=EEa46VYt; arc=fail smtp.client-ip=52.101.85.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="EEa46VYt" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=mn3qtEj7qs/GSCT8giq7OKcqZfPBD06XHZli1nSAIAN1xRliWNgm9gH8WbiAxMe0eqKlEhmC264NBWOUCS5GHo0RsugCStKOFT0uWvkWu75yoxqI32VZ6goJMWXDzen47WhmifO0ZCvk0BjScuZYG2PHqZumkx10RwIpIJfIwT+bk3fjDAJnAPqU89PpOfWY3hHMBaQDaYiulJki9aXY+Dl14nU4ZMS5pf97ggq1GG1BGmaJbpwgJ7YhOE2Qc0AqrFRyR/M32gec8OYZJZNuC1o7VbxSjB+jU665WPRR/9NvYCIgHZWo7FzhLWLDTPOeztP1y69xUgYLlr/KDDCH2A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; 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=yD12oTLV7Uzmr02nBbZuUPyEIB/YGtF1Y6Vg8oLsyQw=; b=Y0fFuhwiSVrp1PvB9ShH+K2pMX1Hgy9qa5648maD1arJOMykNl7frqCZ0VstfSbgD5d+oM7WUBCByHLmVtlDx9onhq4C/EkA5F0MLoH7zhMxVEfkfKWADKPSfz/+JrTnoOP9RDdKhe08WwUYSoqCR+0bdmDSukGPIDRwnTim2GjApKIZ0m9BxsaV6JiaVygFxkiT71vYCNHvL6jhFTluVYxR6tVdoJbiUc2J5cY0UysPR/1Rbtzh43VzYPADffVpmyDSTQRFLPQGV9VxiRZyNYy4b5LdxW18Szh2Ks5jDk6VOH1UXccyV6sEFD19Mm8jqxS/5jvFJ0EakfCiboqRsA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.118.233) smtp.rcpttodomain=kernel.org smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=yD12oTLV7Uzmr02nBbZuUPyEIB/YGtF1Y6Vg8oLsyQw=; b=EEa46VYtnu4/tQ0KzFHCHXoEbgsKZTD+NdFNA6X9yvUbkVzecdFKZtuZZB0wPk2jy7LyYVgc8itxv4DPH/idY6zT8f1iSfCxbaUZ3z8W4dki3mn976BLlAuOM7qJY5J34nAuAKVRVH6eEOPrjBcXxHuXIcoMo0qD2vHOSMcGySayjFMtz08j2VjM7rMfHT0Jpck9JfWAWKiaH9wTVQsSwRtMlY3WMOfqE+UX7kzsnRwbNpbUoSjt+HXfIKndmQ0E9evsBjZ8o3nU6mtMXi7KTNf4P8q2CCNPI/eytNpEm6UaSHJPI8vYbJ4TY8UhVlrM0LAlX6lpiyoT45JtJs7X0Q== Received: from PH7P220CA0174.NAMP220.PROD.OUTLOOK.COM (2603:10b6:510:33b::21) by MN6PR12MB8471.namprd12.prod.outlook.com (2603:10b6:208:473::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9587.15; Fri, 6 Feb 2026 14:28:47 +0000 Received: from SN1PEPF000397B4.namprd05.prod.outlook.com (2603:10b6:510:33b:cafe::91) by PH7P220CA0174.outlook.office365.com (2603:10b6:510:33b::21) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9587.15 via Frontend Transport; Fri, 6 Feb 2026 14:28:45 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.118.233) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.118.233 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.118.233; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.118.233) by SN1PEPF000397B4.mail.protection.outlook.com (10.167.248.58) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9587.10 via Frontend Transport; Fri, 6 Feb 2026 14:28:47 +0000 Received: from drhqmail203.nvidia.com (10.126.190.182) by mail.nvidia.com (10.127.129.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Fri, 6 Feb 2026 06:28:26 -0800 Received: from drhqmail202.nvidia.com (10.126.190.181) by drhqmail203.nvidia.com (10.126.190.182) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Fri, 6 Feb 2026 06:28:25 -0800 Received: from sumitg-l4t.nvidia.com (10.127.8.14) by mail.nvidia.com (10.126.190.181) with Microsoft SMTP Server id 15.2.2562.20 via Frontend Transport; Fri, 6 Feb 2026 06:28:18 -0800 From: Sumit Gupta To: , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , Subject: [PATCH v8 7/7] cpufreq: CPPC: Add sysfs documentation for perf_limited Date: Fri, 6 Feb 2026 19:56:58 +0530 Message-ID: <20260206142658.72583-8-sumitg@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260206142658.72583-1-sumitg@nvidia.com> References: <20260206142658.72583-1-sumitg@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF000397B4:EE_|MN6PR12MB8471:EE_ X-MS-Office365-Filtering-Correlation-Id: 375623dc-06c9-4e0a-7e10-08de658c0a2b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|82310400026|7416014|376014|1800799024|921020; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?WqVuWevdpoIdINj3NKO3rVlKZvLjuUGi6/zlL+1qeQCvEufMdcq0VEPHqbFt?= =?us-ascii?Q?eVSInk4kGxvw61023e5yDHoKxgc3+MTqmsK0Ku2YwAVQODJ9kcFYiArdFgr1?= =?us-ascii?Q?/eO28tLoD6rYXOhA7qmABdwUEAPeXz5bHc92n9bcr6ckCGhwjq4krl38W3+n?= =?us-ascii?Q?xjuaV7ec34kHlVjoVENTqFGhHw5EIVLNAfZILtHoHRa9foARyITP5wvWhFFq?= =?us-ascii?Q?wxF8mePdpxzv35zTmBpdvUv2rN95QW8frzYamUa5H+AqxvT1wmb36xH3Y4ii?= =?us-ascii?Q?qm7msDKDHHLTtKXqex7e7sJrTecFTC6HiF7YpkXpKjhMxIZWGcYdvPE/WZet?= =?us-ascii?Q?1NJ3CLS5jO64vPLTv1WCKUKULJ2Thvj8LEB11AKOhMjomHH/+sqDswqyAkZ/?= =?us-ascii?Q?mPzAPyoM3Y9QOYsIsh2dBauqtglRnrmw+u0RvRli54q7kKYWHsRTKW9RSwlj?= =?us-ascii?Q?6rOS3OW0daNGR50HHvlGAuiYZ2IVxAbN7cx2lOZ+qfng5bMXfJNy3/uMiAdK?= =?us-ascii?Q?8oyeuEo8nOOtvm2Sx/UvVniRRHu7RySzX7X7cpmeJF/9gDMCXUukzQX2RZ3h?= =?us-ascii?Q?36wETl2/neTF3qQJINElbo1w72Ankeo07+Z5Z2Ew1yU88rrfXjF5RebPa74v?= =?us-ascii?Q?AnKEHYgql04a833BYLdtNrk04oU7Lz/nhUAllbg7Mre/KbxlqbgzzuKz9Qvd?= =?us-ascii?Q?5my5fjNYMc0XTAgusPsd0Z3PuMaHpN5Vm7iRVNtAr4qjGzPqVGQXzm4OfJ2V?= =?us-ascii?Q?eP+5aHsg3O2MQbZsNA6tF/HurejBdOG3x98mCfgA5Wx7ET/QNHeeC45/YwNJ?= =?us-ascii?Q?pzNWa5HmOwNtmCywutbxN5wAkO3zVrnaqGNgkMiIADtURZR/DO4xbeM/PePw?= =?us-ascii?Q?fPtWkK5CzwDrynZvmjkgpcWRY9gLTTjqjYtaRo/yG99NLUHkxacCsQxEDPNw?= =?us-ascii?Q?tWIeNoJJFP8hbYiq09R2bEVy5N2gvs7CIwVY6UpdGfBQ8wQCgLApOmHpAtsI?= =?us-ascii?Q?+YnV2eZocbFlr32AXHbfT5hhdJYng3V3HzpXD5TYO73ILnGmfmghrPia6B6F?= =?us-ascii?Q?Dqv2zyOONWFmLghJLki1awLSSCsbe4B6hMtBS39oFa2CwstKazC8Bxl35zuw?= =?us-ascii?Q?BD8d+7PStVr5TktuTR8cNveD2KOj6Z4V7Rtb7LLmYaMVG5gAsd9Q6g+SYhvx?= =?us-ascii?Q?Br7OXcPXnLLMoaWHbVOUBKLt3fto7Z80BCA1rG7BNkJb7AvetqYPt8cHAA5/?= =?us-ascii?Q?iRas/qVlChqpW/SH9P+1AEKQEfE+YWYs1M8kEB8i3B74k8rueJtiaxrpwLDw?= =?us-ascii?Q?+Ew5NU6S6teRykL7QXC/AC+mDvv0M16k2LXX0LpBaId/e34VG4aQan3/6p7t?= =?us-ascii?Q?IQvS4AIj6vr6Mg0jhCkwY9VNxaislHjT9ZDpvvUM2QkZkN5ccBow++PClrsg?= =?us-ascii?Q?c/0Upc/xTaHZ7wsk8a2NQZVlfYPdRqsPKtXMBkKkYBq3xPWFRZ95M4ITmHTW?= =?us-ascii?Q?KiC6L4Ikg9t+Sic56NwgLUVxQR5pcdAXjTDHAtZLfqAIO76wReXN0KtyGu/y?= =?us-ascii?Q?jQyv6tSdV8U3rdSy9fTnIAhGbMSf4wl3t4Cg31pJWcgvVa6NQVd9w/zwHgPE?= =?us-ascii?Q?FxlDOHBir4gDG8apzXqxYv9cSP3PcfJ1WxkvnD5wuma9zcXxJtqKBU+bS4EK?= =?us-ascii?Q?9n8um4d8AsvYe8O3NgFcHtUzwII=3D?= X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(36860700013)(82310400026)(7416014)(376014)(1800799024)(921020);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: naJmgl0aykeq4Z02WHCUcb4uVmiz9fG9pbp20Kfds9yjjz2XYzo+wGSVEDzR6XxO+7IlZXJFhxnLlIOOEwMYJ6NLP8HV2lFUXYgIcpRS14a975eqiXXnIsVhDIu6ZFcZ5GeJtUZxONNrEYiQI2hxNV16w3ArPj55X45JSzJRO4dvtZYvIdmUdXVFWwrM9aXXwoe5DWT5Z0csyCDcu1dr6Nlm1ZZmya3boywPwC7BSw+lkfUoOg2vOkTof7iopc/2xUnoczMpk5EK8AOtaEvNWAvM18Jq9jXL8xhabbqqwbk/OqgpMTY7TnpZRrzMSiMTaag1UiadiXVhTgCkuPRRTNDYOpNuMRC6KR394xsdTQhPxxQJJOz8NsYtVtQZoynYRAjiyy5pXrm3jgoYi8saduC2lLCHgyrUH8P4iwIY8uCR7uyfWaCcUzS+do83gK1R X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Feb 2026 14:28:47.2206 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 375623dc-06c9-4e0a-7e10-08de658c0a2b X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF000397B4.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN6PR12MB8471 Content-Type: text/plain; charset="utf-8" Add ABI documentation for the Performance Limited Register sysfs interface in the cppc_cpufreq driver. Signed-off-by: Sumit Gupta Reviewed-by: Randy Dunlap Reviewed-by: Pierre Gondois Reviewed-by: Lifeng Zheng --- .../ABI/testing/sysfs-devices-system-cpu | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documenta= tion/ABI/testing/sysfs-devices-system-cpu index 3a05604c21bf..82d10d556cc8 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -327,6 +327,24 @@ Description: Energy performance preference =20 This file is only present if the cppc-cpufreq driver is in use. =20 +What: /sys/devices/system/cpu/cpuX/cpufreq/perf_limited +Date: February 2026 +Contact: linux-pm@vger.kernel.org +Description: Performance Limited + + Read to check if platform throttling (thermal/power/current + limits) caused delivered performance to fall below the + requested level. A non-zero value indicates throttling occurred. + + Write the bitmask of bits to clear: + + - 0x1 =3D clear bit 0 (desired performance excursion) + - 0x2 =3D clear bit 1 (minimum performance excursion) + - 0x3 =3D clear both bits + + The platform sets these bits; OSPM can only clear them. + + This file is only present if the cppc-cpufreq driver is in use. =20 What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1} Date: August 2008 --=20 2.34.1