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Fri, 17 Jul 2026 14:53:34 -0700 From: Sumit Gupta To: , , , , , , , , , , , , , CC: , , , , , , , Subject: [PATCH v6 0/2] ACPI / cpufreq: CPPC: Add ospm_nominal_perf support Date: Sat, 18 Jul 2026 03:23:28 +0530 Message-ID: <20260717215330.2215058-1-sumitg@nvidia.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH1PEPF0000AD78:EE_|SA0PR12MB7002:EE_ X-MS-Office365-Filtering-Correlation-Id: 09770b31-7a94-43ce-abd1-08dee44de333 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|82310400026|23010399003|36860700016|1800799024|921020|13003099007|10067099003|18002099003|56012099006|11063799006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(7416014)(376014)(82310400026)(23010399003)(36860700016)(1800799024)(921020)(13003099007)(10067099003)(18002099003)(56012099006)(11063799006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: eq1f0rPbzvG0HGbWVZOveB8HD/UWogK+LZuothbvYLNtI2PLvXAj9lPrpzPYNMAjAe50htMRnIr6YZh9RdeD6FCLkTA6nNJxs5RNVcUlfC7euvbz2qFx81czdx/Jgn4PWvvE5GbuioW7wscMdZ0Mjcwu7Wj6iuxiNC2Ziz2w9FtbDSMLXwI3LkS5KhY4gqfKeSFFj1LXkrLFW8ekB2FUPqAAVGZNTH26v3lDqYNlfpwu+fQpqfIeh4K/8xPolf2GY0PFdpH/IhNEcLq6CBjzvkWfNNv/M+sPma+vN1jZLX968wp+5GFKw1gtPeGHY4K6x62mupyCTz8RDhlhb9mRn0h4cINWgbLpv8gR+EA4HKOq4UAbyUy8rgGbbvDXkp8WzrF+fno0/lU69M4aGtlkDx1rO/Jo6Crghx5aMawJ7r5rde8IQOukMasbXOgiBFSF X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jul 2026 21:53:50.7155 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 09770b31-7a94-43ce-abd1-08dee44de333 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH1PEPF0000AD78.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB7002 This series adds support for the OSPM Nominal Performance register (ACPI 6.6, Section 8.4.6.1.2.6) to the CPPC ACPI and cpufreq drivers. Unlike the read-only Nominal Performance register, OSPM Nominal Performance is writable and lets OSPM request a nominal level below the platform-reported nominal. The platform treats performance above this level as boost and below as throttle for its power and thermal decisions. Patch 1: adds the cppc_{get,set}_ospm_nominal_perf() helpers, a per-policy cpufreq sysfs attribute (ospm_nominal_freq, in kHz), and hooks the register into the OSPM-set save/restore table. Patch 2: reflects the OSPM nominal in the cpufreq policy so that boost and the frequency limits stay consistent with the register. This series applies on top of the series "cpufreq: CPPC: Preserve OSPM-set registers across hotplug and unload", which provides the save/restore table that patch 1 hooks into: https://lore.kernel.org/lkml/20260716153820.2007095-1-sumitg@nvidia.com/ v5[5] -> v6: - New patch 2: reflect the OSPM nominal in the policy's boost state and frequency limits. - Patch 1: - write only policy->cpu instead of looping over policy->cpus with rollback. the register is treated as shared across a policy's CPUs. - add the register to the OSPM-set save/restore table. Sumit Gupta (2): ACPI: CPPC: Add ospm_nominal_perf support cpufreq: CPPC: Reflect ospm_nominal_perf in boost and limits .../ABI/testing/sysfs-devices-system-cpu | 26 +++ drivers/acpi/cppc_acpi.c | 32 ++++ drivers/cpufreq/cppc_cpufreq.c | 166 +++++++++++++++++- include/acpi/cppc_acpi.h | 10 ++ 4 files changed, 226 insertions(+), 8 deletions(-) v5: https://lore.kernel.org/lkml/20260615185934.2383514-1-sumitg@nvidia.com/ v4: https://lore.kernel.org/lkml/20260527194626.185286-1-sumitg@nvidia.com/ v3: https://lore.kernel.org/lkml/20260514194822.1841748-1-sumitg@nvidia.com/ v2: https://lore.kernel.org/lkml/20260430142430.755437-1-sumitg@nvidia.com/ v1: https://lore.kernel.org/lkml/20260427051823.280419-1-sumitg@nvidia.com/ -- 2.34.1