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Tue, 20 Jan 2026 06:56:30 -0800 From: Sumit Gupta To: , , , , , , , , , , , , , , , , , , CC: , , , , , , , , Subject: [PATCH v6 0/9] Enhanced autonomous selection and improvements Date: Tue, 20 Jan 2026 20:26:14 +0530 Message-ID: <20260120145623.2959636-1-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: CY4PEPF0000E9DB:EE_|DS2PR12MB9565:EE_ X-MS-Office365-Filtering-Correlation-Id: de0a6c15-e1be-4db9-b0df-08de58343238 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|7416014|376014|82310400026|1800799024|13003099007|921020; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?GDb47K65D68/waXdewffZlbCd1zbTAbluAa91lN3IHpY1nfKJNceZpHaOXeY?= =?us-ascii?Q?YtgDcSfnupXNrLu95ynRvjBUU6E9i7olex3JdqN+H5uS8GvvYat8Qs//LFgB?= =?us-ascii?Q?ETNuDSYLOe5ClMHRdM7U7kBizb2vQD2ABjRfcwQT5B/wxcH8J70GFVTVRUYC?= =?us-ascii?Q?kQ8TNv/DrkkP51cBq4mp2aLCpthbFRi+pa8avdVwkXvG43jwQQnqFDgivm1P?= =?us-ascii?Q?Gznqs1Bj68paQslY743iJC3jxWBFfHhmit6/peazAPC8P4QOWYXRKDSGM8hj?= =?us-ascii?Q?E0PY6M/U9gnWoN50UGy9DyEKr3ceJ1QtFAc+wP5wNMN/m4ZgkPrgoOfPZDkl?= =?us-ascii?Q?1RqUQjJAdctCLCLakwUWXNDwhytrJ0HDI7HrnYh+6I2lqauoHiKdMOCGcZEF?= =?us-ascii?Q?fv+1LNBiaihP50jNkySjdDOYk997w4lo3r25uymTgrrLz0Z9r0wjaihdeq9K?= =?us-ascii?Q?xtAQlVrA1qqvkr9r7+6GuvUJFiSG6nZoR72QzFgdqmJzpBTuc91HjSj6O/55?= =?us-ascii?Q?0+n3T+pEUCIEtnqLazFPxl8BdBCJUmbOpTn0IDyT3BuaxTdAI/zKgbNdvSQy?= =?us-ascii?Q?tjNcFVqLK4GLMhEAXopgP3KawbDEoxDwdZ9Y2GlXgM4+uzXRiFxMNDeU/Aok?= =?us-ascii?Q?q/cZQYG4J5/Zvt98qw995HPreWSgExvTT7ZWOowIJgHRDULRS4Nz99lK1sWn?= =?us-ascii?Q?hveI5WAXhPWF2G8bUv1UdIXWAQCqp9wFSN50nXrzB35YqoE3apc7hAAcYIXn?= =?us-ascii?Q?2H7RznSmzMDv6HIWiWRsl3N7nnWvj8AZHg+0lKY6NCogcfKXJGb6jfYe0EZq?= =?us-ascii?Q?pa4hYBtHBECGluZnD6Pmjhnq0efIy0QPHPgrPTHdbuiN6ZPaTlfoMDc2iuxK?= =?us-ascii?Q?h9t4lRSMrnkQROlAbC9N5kvLm3fWzZrLjE/1AXzjtDKFuLBJnV/7vBvygiLc?= =?us-ascii?Q?CywwMi6VOwlh1cGsM8ExZiGLfSCymMgD8++Iwq475hDC8JagE+bDQtRGUvHo?= =?us-ascii?Q?2kGhEtD4Ye5nQSZOw03shc/yehtxFd1xUL0nm0afKjtAMYnI0/ucx0/67lpC?= =?us-ascii?Q?/ewQnY0Xm6gsRUiTlJ0xzwXXMJ5g1OAS21189/c3GCBWd0uSDDqO7f3NO+Je?= =?us-ascii?Q?SYHscPyb9ilmAvQdINL0PRSv0oR4yElW+fKV2cPy9GD4YXf3oyKeMrH1H5f/?= =?us-ascii?Q?FP/Hd3IparSNGEMLh1Ezs6aCFiz1rgcDr6ybhkUkQ5TgIuRGIU+rxh3UEb7v?= =?us-ascii?Q?y1epoVJPSA0Kbas0oMwOpzv+6F/aHvVK52eM8Z2G0Rfdb3fu95Ds/qSqWtOG?= =?us-ascii?Q?7UtLEJATUcVH9rd0wx6Bn2nUFtMOWm94N/Q/+h8EH/VfVdbyEPhHk8Hs1qHJ?= =?us-ascii?Q?Qs3w5UPVa5wHaX6yPbBKOuv3z98LSSfCAr8hIMG0hH+i/BUEKTnvWvmHLIfm?= =?us-ascii?Q?o05b4cNQ+dFNb6d7CeXZw0mjbFSJxwYbdu020Wglb1qh2kxqNNO6ul7Phodm?= =?us-ascii?Q?XmwV5TkslfCWKMRw0o/2cJgtuvORHpjI4qPoHHMT2bVSt9kWSYY41dWAEG/B?= =?us-ascii?Q?j+6B7/HQDUssK5sSZEpceIY4EUm53X8MaXdwTd3syJK5cxzGgBIzAy8aSdAP?= =?us-ascii?Q?EqQ8gD5zmSsYUl0nrwb9ILwqMXmY9KQeYrq6GyOYiX2gsl67Hf6OMckkmdYk?= =?us-ascii?Q?HbKMELcKHNQR3/5glfPCIcFlqxc=3D?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(36860700013)(7416014)(376014)(82310400026)(1800799024)(13003099007)(921020);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jan 2026 14:57:13.5935 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: de0a6c15-e1be-4db9-b0df-08de58343238 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: CY4PEPF0000E9DB.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS2PR12MB9565 As discussed in [6], v5 is split into two parts. This is part 1 (v5 patches 1-7) and can be applied independently. I will follow up separately with part 2 (v5 patches 8-11). This patch series adds sysfs interfaces for CPPC min_perf, max_perf, and perf_limited registers, along with supporting ACPI APIs and improvements for the cppc_cpufreq driver. CPPC autonomous mode (auto_sel) enables hardware-driven CPU performance scaling using Energy Performance Preference (EPP) hints. Currently, there's limited runtime control and visibility into CPPC performance registers. This series addresses these gaps by: 1. Exposing min_perf/max_perf registers via sysfs (as frequency in kHz) to allow fine-grained performance bounds control in autonomous mode. 2. Exposing perf_limited register to detect and clear throttling events. It also includes code improvements: generic sysfs helpers, struct cleanup, new APIs for reading performance controls, and extended epp_perf support. The patches are grouped as below: - Patch 1: Generic sysfs helpers (refactoring, independent). - Patch 2-4: Code improvements (can be applied independently). - Patch 5: Extend cppc_set_epp_perf for FFH/SystemMemory (independent). - Patch 6-7: APIs and sysfs for min/max_perf, perf_limited (independent). - Patch 8: ABI documentation (depends on patch 6-7). - Patch 9: Update cached perf_ctrls on sysfs write (depends on patch 6). --- v5[5] -> v6: - Split patchset as described above. - patch1: added CPPC_CPUFREQ_ATTR_RW_U64 macro for sysfs attributes. - patch3: new patch to rename EPP constants for clarity. - patch5: simplified else block in cppc_set_epp_perf(). - patch6: fallback to caps values if registers are uninitialized. - patch7: use CPPC_CPUFREQ_ATTR_RW_U64 macro for perf_limited sysfs. - patch9: new patch to update cached perf_ctrls on sysfs write. - Renamed mutex to cppc_cpufreq_autonomous_lock. Sumit Gupta (9): cpufreq: CPPC: Add generic helpers for sysfs show/store ACPI: CPPC: Clean up cppc_perf_caps and cppc_perf_ctrls structs ACPI: CPPC: Rename EPP constants for clarity ACPI: CPPC: Add cppc_get_perf() API to read performance controls ACPI: CPPC: Extend cppc_set_epp_perf() for FFH/SystemMemory ACPI: CPPC: add APIs and sysfs interface for min/max_perf ACPI: CPPC: add APIs and sysfs interface for perf_limited cpufreq: CPPC: Add sysfs for min/max_perf and perf_limited cpufreq: CPPC: Update cached perf_ctrls on sysfs write .../ABI/testing/sysfs-devices-system-cpu | 44 ++++ drivers/acpi/cppc_acpi.c | 206 +++++++++++++++- drivers/cpufreq/cppc_cpufreq.c | 224 ++++++++++++++++-- include/acpi/cppc_acpi.h | 46 +++- 4 files changed, 491 insertions(+), 29 deletions(-) [1] https://lore.kernel.org/lkml/20250211103737.447704-1-sumitg@nvidia.com/ [2] https://lore.kernel.org/lkml/20250823200121.1320197-1-sumitg@nvidia.com/ [3] https://lore.kernel.org/lkml/20251001150104.1275188-1-sumitg@nvidia.com/ [4] https://lore.kernel.org/lkml/20251105113844.4086250-1-sumitg@nvidia.com/ [5] https://lore.kernel.org/lkml/20251223121307.711773-1-sumitg@nvidia.com/ [6] https://lore.kernel.org/lkml/66f58f43-631b-40a0-8d42-4e90cd24b757@arm.com/ -- 2.34.1