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Thu, 14 May 2026 12:48:25 -0700 From: Sumit Gupta To: , , , , , , , , , , , CC: , , , , , , Subject: [PATCH v3 0/2] ACPI: CPPC: Add CPPC v4 support (ACPI 6.6) Date: Fri, 15 May 2026 01:18:20 +0530 Message-ID: <20260514194822.1841748-1-sumitg@nvidia.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-acpi@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: BN3PEPF0000B06B:EE_|PH7PR12MB7305:EE_ X-MS-Office365-Filtering-Correlation-Id: 02ac5c35-c670-4a88-d253-08deb1f1ceec X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|376014|1800799024|7416014|13003099007|921020|56012099003|18002099003|11063799003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(36860700016)(376014)(1800799024)(7416014)(13003099007)(921020)(56012099003)(18002099003)(11063799003);DIR:OUT;SFP:1101; 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The platform classifies performance above this as boost and below as throttle for power/thermal decisions. - Resource Priority (8.4.6.1.2.7): Package of Resource Priority Register Descriptor sub-packages. Full parsing is not yet implemented; such entries are marked as unsupported. Patch 1: Add v4 _CPC parsing - validate the 25-entry layout, restrict the Resource Priority package fallback to that slot only, and mark the two new registers optional. Patch 2: Add per-policy sysfs attribute ospm_nominal_freq (kHz) under cpufreq. Writes are converted to perf and applied to every CPU in policy->cpus. --- v2[2] -> v3: - Patch 1: - Accept ACPI_TYPE_PACKAGE only at RESOURCE_PRIORITY; abort otherwise. - Added Reviewed-by from Pierre Gondois. - Patch 2: - Sysfs moved from per-CPU acpi_cppc to per-policy cpufreq. - Read ospm_nominal_freq sysfs input in kHz and convert to perf. - Cached ospm_nominal_perf moved from cpc_desc to cppc_cpudata. - Validate input against [Lowest Performance, Nominal Performance] in cppc_set_ospm_nominal_perf(). - Dropped unconditional init in cppc_cpufreq_cpu_init(). - Remove to skip write if cache matches in cppc_set_ospm_nominal_perf. - Early -ENODEV return when no CPC descriptor. - Added ABI documentation at Documentation/ABI/testing/sysfs-devices-system-cpu. v1[1] -> v2: - Patch 1: Added Reviewed-by from Mario Limonciello. - Patch 2: - Make ospm_nominal_perf sysfs read-write; cache last write in cpc_desc and skip redundant register writes. - Validate input in cppc_set_ospm_nominal_perf. Sumit Gupta (2): ACPI: CPPC: Add support for CPPC v4 ACPI: CPPC: Add ospm_nominal_perf support .../ABI/testing/sysfs-devices-system-cpu | 17 ++++++ drivers/acpi/cppc_acpi.c | 58 +++++++++++++++++-- drivers/cpufreq/cppc_cpufreq.c | 40 +++++++++++++ include/acpi/cppc_acpi.h | 15 ++++- 4 files changed, 122 insertions(+), 8 deletions(-) [1] https://lore.kernel.org/lkml/20260427051823.280419-1-sumitg@nvidia.com/ [2] https://lore.kernel.org/lkml/20260430142430.755437-1-sumitg@nvidia.com/ -- 2.34.1