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Tue, 23 Jun 2026 01:06:55 -0700 From: Sumit Gupta To: , , , , , , , , , , , , , CC: , , , , , , , Subject: [PATCH v5 0/2] cpufreq: CPPC: add autonomous mode boot parameter support Date: Tue, 23 Jun 2026 13:36:50 +0530 Message-ID: <20260623080652.3353386-1-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: BN1PEPF00005FFF:EE_|CY8PR12MB8067:EE_ X-MS-Office365-Filtering-Correlation-Id: 700d16a6-de29-4534-f425-08ded0fe729c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|36860700016|376014|23010399003|7416014|13003099007|18002099003|921020|56012099006|11063799006|3023799007; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(1800799024)(36860700016)(376014)(23010399003)(7416014)(13003099007)(18002099003)(921020)(56012099006)(11063799006)(3023799007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: ikQdEZ9Mo8efdq2Kj3ccKfzl8v59EkDBaf2yUVp/8pmy17RdQ0SK7sMw40dann9YF4Gessx8CiNjWtk3zQHfOZpzCdGQgp9z71IcNzba51cMtwyOM0NcE+Ypr6fs1Em8TZYH7YO/UBCnAwoY7K7jYH1voznfQqjjb49coVgKhBVx9dyYrovu3gDesM7ryY36SZVZ2z7xxJjiFCLjv5LgCjisWCWU1Bl5ldVc+eQz7UQ5ewkRtbL4CjCWeQNmNRfsdjZAR3ZTvSTB1VQgaCOODmFID9jmnSGEnbbjed0Z2GRu9sfRKFjlaaRXM85uHu2oaF9fdye85o0AIg7nFlblvYMAZyhZN78b+LC5LUQuKgJ8oQI08grj0wi+N2ivMlTOYTZh4Ifu01r3sJx5+IRO9iOtpIVUioct+yru1mDqwRvXBA11RMjSqtWOQOCIvoQP X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jun 2026 08:07:19.4487 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 700d16a6-de29-4534-f425-08ded0fe729c X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF00005FFF.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB8067 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 relies on commit 8c83947c5dbb ("cpufreq: Use policy->min/max init as QoS request") so that policy->min/max set during cppc_cpufreq_cpu_init() are not overridden by cpufreq_set_policy(). v4[4] -> v5: - Accept "disabled/0" and treat unrecognized auto_sel_mode as disabled. - Rebased on the merged QoS-constraints and updated commit dependency. 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 | 22 +++ drivers/cpufreq/cppc_cpufreq.c | 159 +++++++++++++++++- include/acpi/cppc_acpi.h | 1 + 3 files changed, 177 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] v4: https://lore.kernel.org/lkml/20260527202550.206828-1-sumitg@nvidia.com/ -- 2.34.1