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Wed, 27 May 2026 13:25:53 -0700 From: Sumit Gupta To: , , , , , , , , , , , , CC: , , , , , , , , Subject: [PATCH v4 0/2] cpufreq: CPPC: add autonomous mode boot parameter support Date: Thu, 28 May 2026 01:55:48 +0530 Message-ID: <20260527202550.206828-1-sumitg@nvidia.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-doc@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: DS3PEPF0000C380:EE_|MN2PR12MB4303:EE_ X-MS-Office365-Filtering-Correlation-Id: e6dd958d-2652-44c3-44ca-08debc2e3503 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|7416014|921020|11063799006|3023799007|18002099003|13003099007|56012099006; X-Microsoft-Antispam-Message-Info: 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 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)(1800799024)(82310400026)(36860700016)(376014)(7416014)(921020)(11063799006)(3023799007)(18002099003)(13003099007)(56012099006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: jUGoTQpOoP+H04Q4BhLxgCuJw5H6F5Blf1zGKkrmBgrmTYpK2u/Be8KKQD2XmkxW/hcPJs39kKjY9TqN67mlOVKbaUkpW5lSoYgaLa3lKyYduO9jai5HITg+HzuLUxRgmeTv0CNmstbRPqaEx5Ukz5dXLLHCVwocScLsSbaTRB8yQsxfJNI30WaD+eXRpxt0R1I64h3/NOLYXJBCFm9zrDNqs/UFcXmy2qQPGKyJprAeErxWaXEa9fE3mwBvqsZiQ/1dTvQPEzGt9kMRK1B2xmuiwSGeMvKc7gLCbiUHmGjQf4SvjKRYw6DqtCVl3FKUVG+27ob2/U/NZ0gPNd9gDBUtWpsCQt/gfXLKQFQVbkOWnDCK+B+bYCMdDBkvTuPklyF8HIQvbcRztmkK49ayIMmHbuxP2KzCOOOzj/ICS9jJHLSC0pKIeciKNAVwv7Rh X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 May 2026 20:26:17.5611 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e6dd958d-2652-44c3-44ca-08debc2e3503 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: DS3PEPF0000C380.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4303 This series adds a kernel boot parameter 'cppc_cpufreq.auto_sel_mode' to enable CPPC autonomous performance selection on all CPUs at system startup, avoiding per-CPU sysfs scripting at every boot. When autonomous mode is enabled, the hardware automatically adjusts CPU performance based on workload demands using Energy Performance Preference (EPP) hints. Patch 1: Sets CPPC Enable Register for both OS-driven and autonomous CPPC control modes. It can be applied independently of patch 2. Patch 2: Adds the auto_sel_mode boot parameter with three modes: - performance (or 1): override EPP to performance (0x0) - balance_performance (or 2): override EPP to balance_performance (0x80) - default_epp (or 3): preserve EPP value programmed by BIOS/firmware Patch 2 depends on Pierre's series [4] ("cpufreq: Set policy->min and max as real QoS constraints") so that policy->min/max set during cppc_cpufreq_cpu_init() are not overridden by cpufreq_set_policy(). v3[3] -> v4: - Add 'balance_performance' mode which sets EPP to 0x80. - Add CPPC_EPP_BALANCE_PERFORMANCE_PREF (0x80) constant in cppc_acpi.h. - Clean up EPP mode selection with switch + boolean flag in cpu_init. - Use local variable for kp->arg in auto_sel_mode_set/get to avoid repeated casts. Sumit Gupta (2): cpufreq: CPPC: Set CPPC Enable register in cpu_init cpufreq: CPPC: add autonomous mode boot parameter support .../admin-guide/kernel-parameters.txt | 20 +++ drivers/cpufreq/cppc_cpufreq.c | 154 +++++++++++++++++- include/acpi/cppc_acpi.h | 1 + 3 files changed, 170 insertions(+), 5 deletions(-) [1] v1: https://lore.kernel.org/lkml/20260317151053.2361475-1-sumitg@nvidia.com/ [2] v2: https://lore.kernel.org/lkml/20260424201814.230071-1-sumitg@nvidia.com/ [3] v3: https://lore.kernel.org/lkml/20260515122624.1920637-1-sumitg@nvidia.com/ [4] https://lore.kernel.org/lkml/20260511135538.522653-1-pierre.gondois@arm.com/ -- 2.34.1