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Wed, 5 Nov 2025 03:40:13 -0800 From: Sumit Gupta To: , , , , , , , , , , , , , , , , , , CC: , , , , , , , , Subject: [PATCH v4 6/8] cpufreq: CPPC: Add sysfs for min/max_perf and perf_limited Date: Wed, 5 Nov 2025 17:08:42 +0530 Message-ID: <20251105113844.4086250-7-sumitg@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251105113844.4086250-1-sumitg@nvidia.com> References: <20251105113844.4086250-1-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: BL6PEPF00020E65:EE_|DS0PR12MB7970:EE_ X-MS-Office365-Filtering-Correlation-Id: 8cf9180f-b3a8-426f-57ed-08de1c602540 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|7416014|376014|1800799024|921020; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Nov 2025 11:40:39.8654 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8cf9180f-b3a8-426f-57ed-08de1c602540 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF00020E65.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7970 Content-Type: text/plain; charset="utf-8" Add sysfs interfaces for Minimum Performance, Maximum Performance and Performance Limited Register in the cppc_cpufreq driver. Reviewed-by: Randy Dunlap Signed-off-by: Sumit Gupta --- .../ABI/testing/sysfs-devices-system-cpu | 46 +++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documenta= tion/ABI/testing/sysfs-devices-system-cpu index 8aed6d94c4cd..6f1f70696000 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -327,6 +327,52 @@ 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/min_perf +Date: December 2025 +Contact: linux-pm@vger.kernel.org +Description: Minimum Performance Frequency + + Read/write a frequency value in kHz from/to this file. This + file conveys the minimum performance level (as frequency) at + which the platform may run. The frequency value is internally + converted to a performance value and must correspond to a + performance level in the range [Lowest Performance, Highest + Performance], inclusive. The minimum must be less than or equal + to the maximum performance. The performance range can be checked + from nodes: + /sys/devices/system/cpu/cpuX/acpi_cppc/highest_perf + /sys/devices/system/cpu/cpuX/acpi_cppc/lowest_perf + + This file is only present if the cppc-cpufreq driver is in use. + +What: /sys/devices/system/cpu/cpuX/cpufreq/max_perf +Date: December 2025 +Contact: linux-pm@vger.kernel.org +Description: Maximum Performance Frequency + + Read/write a frequency value in kHz from/to this file. This + file conveys the maximum performance level (as frequency) at + which the platform may run. The frequency value is internally + converted to a performance value and must correspond to a + performance level in the range [Lowest Performance, Highest + Performance], inclusive. The performance range can be checked + from nodes: + /sys/devices/system/cpu/cpuX/acpi_cppc/highest_perf + /sys/devices/system/cpu/cpuX/acpi_cppc/lowest_perf + + This file is only present if the cppc-cpufreq driver is in use. + +What: /sys/devices/system/cpu/cpuX/cpufreq/perf_limited +Date: December 2025 +Contact: linux-pm@vger.kernel.org +Description: Performance Limited + + Read/write a 32 bits value from/to this file. This file indicates + to OSPM that an unpredictable event has limited processor + performance, and the delivered performance may be less than + desired/minimum performance. + + 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