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Thu, 29 Jan 2026 02:48:19 -0800 From: Sumit Gupta To: , , , , , , , , , , , , , , , , , , CC: , , , , , , , , Subject: [PATCH v7 0/7] Enhanced autonomous selection and improvements Date: Thu, 29 Jan 2026 16:18:10 +0530 Message-ID: <20260129104817.3752340-1-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: BL02EPF00029927:EE_|BY5PR12MB4148:EE_ X-MS-Office365-Filtering-Correlation-Id: d6f2c6ed-b8e1-4909-c6e0-08de5f23f84b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|36860700013|1800799024|82310400026|13003099007|921020; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?73Gd5Rs22pZW6TWatzsiZh61lPp6MnuINjQSLsSQzzZZ4av0Kg0Xf1pxP7NL?= =?us-ascii?Q?6CGhamIbJM8/oipSmA6zJrM/W1bQZckfmPbS9Do/Dvhl16b67Cfj4az7Gpqb?= =?us-ascii?Q?J5ygo/eARJSAWnlbwg/y8Hc7bRLjnVngZ8obtAD+VQsYhSynrr8TlThm0E+Z?= =?us-ascii?Q?bb0ThTDbSvBZeXzxE7BS+mKt1qXBnwIVKAuDMbv6szXGBQZEiibLnj5QPqKB?= =?us-ascii?Q?HyhXoDGkqgfsGbX0tKoU76oLT4vT5l5OIqfyoub2BzXbOG5ffZ6VFV2qNoJX?= =?us-ascii?Q?SmNinsXE8rGDcCJlSfpQR/+3+UZxQrHzT3KGs75UrqHxO2VXMgMAG2NPo8Gp?= =?us-ascii?Q?TUXzHGAb1wOIPZWBYXCfbsLyt4fM9tFxBsUTynrgGICIrVJW7tEfSzyNJSFq?= =?us-ascii?Q?9E3Hi4ikFIl3kI68s4FJf9O30OZyOsI2P9E/y38ZkMD0zmx3V8CLbQPSIrgO?= =?us-ascii?Q?5ppm2atJfWUz4BpyypFfliqsww1+/E/19urGYzS2bQ2CHrZ1Y4I2iIyelEc+?= =?us-ascii?Q?A08a2UwKsiDif1tW8crxKtK+Abxz7nMPh1tA7aDU1TOwGvx9lGiS5cJ/xa0P?= =?us-ascii?Q?xqQ8S3IoFEVaiLbVXBc+rR4+1rCDnorkhQpqINTBzRqJy0ShAOHVHbM+Zfxy?= =?us-ascii?Q?GHwJM22luBtFOuD623iRS0AyK2TECvNfdMp+pIikwOobiCRZVWZfeM5K88Kh?= =?us-ascii?Q?rkUNaN8ceYA7aKCnqdAm9yg6JEFrPNPyY3N/1d4obT6vDWya6AhfgsX2mfvF?= =?us-ascii?Q?BqSCZO9oN3GPpxye3d4c745NmfwksNhYSW3YgKybJ71OLufwySFsl7Exemz+?= =?us-ascii?Q?y+gQXcGN5u+ebkzmevnUj5XrU5w2v0fyoCjZdcB28QnbX/e2hNaZM+jn8cXj?= =?us-ascii?Q?1YcEKqUzrsD444IRdlmqIpo36o7QDEkeD3SMiAf9DAIFVNJ3AIgubiusIXsb?= =?us-ascii?Q?KxB4THBMdWxRWyJVPHMaNKYEAFYC7FXFIbA80YybQhhW8Hd9CFIeXSb6m7RK?= =?us-ascii?Q?sgHiv8xmPUFKM2mkJa/O2ES0H3acqr9SgngLiXL7nIt4T700XNFucMu9xhVh?= =?us-ascii?Q?dncr2mN8rt+3aR+6lN71DT9V5RyIH6XkUyRS0c5334hdQO2QawuLfWvJC0PT?= =?us-ascii?Q?bM6pKmGDg5fzFvv3R0ADTA2RyvQlfik0t6YMCEayTf6QWq5600i0PEzxKQhE?= =?us-ascii?Q?bcS4yC+5RVMBCqJZmxizGcq9udbXcb7FUcElDayvvxq3rEuKzj9ZraUlzW4q?= =?us-ascii?Q?tM31cdoS3RN1QNt2OEAhu+2MiUy+pRxiKWABR6vexo3gbDdIvtnQSVMWWiHO?= =?us-ascii?Q?jKlwOwPm+ZE2L6XaHRZb+5RUyNR9w480Jw2M0S/QS7mTLeYTiW+/+g2Luh69?= =?us-ascii?Q?HIxe1pr3dRdAGLxkKcjVXJ5b9xB84mljSD/7Shb+aod68f5weqbo2m668UFr?= =?us-ascii?Q?sQRNyAuJnsq//9+gHmJdspFis1ClogHxsNbb6DJE6G8uOqUf9lJEINhyIqTc?= =?us-ascii?Q?EHtq+qp6m8KGRsuAWHTwhUH27XcvxiLBEzgpScqywzYRD1vDZ4MSv0WSsnxQ?= =?us-ascii?Q?jppPnrvH4tjUHv1UUGPf2humtiIGPwmn5OBuOTJcoLYbJiPWvUksJKs4mtFs?= =?us-ascii?Q?el6eqqVUIBW6GDYUdvUm1KUU2jVqEtbo0e2N/R3izSxZdHOJY3Y1EFVvicRl?= =?us-ascii?Q?kHaX71LNMgfRPn2aE28jqv7mE5U=3D?= 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)(7416014)(376014)(36860700013)(1800799024)(82310400026)(13003099007)(921020);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Jan 2026 10:48:42.5776 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d6f2c6ed-b8e1-4909-c6e0-08de5f23f84b 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: BL02EPF00029927.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4148 As discussed in [7], v5 was split into two parts. This is part 1. - Patch 1-3 from v6: Applied by Rafael for 6.20. - Remaining patches: Included in this v7 with review comments addressed. Part 2 (v5 patches 8-11) will follow separately. 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: new APIs for reading performance controls, a warning for missing mandatory DESIRED_PERF register, and extended epp_perf support. The patches are grouped as below: - Patch 1: Add cppc_get_perf() API (independent). - Patch 2: Warn on missing mandatory DESIRED_PERF (independent). - Patch 3: Extend cppc_set_epp_perf for FFH/SystemMemory (independent) - Patch 4-5: APIs, sysfs for min/max_perf, perf_limited (independent) - Patch 6: Doc for min/max_perf and perf_limited (depends on 4-5) - Patch 7: Update cached perf_ctrls on sysfs write (independent). --- v6[7] -> v7: - patch 1-3 (v6): Dropped as they were applied by Rafael for 6.20. - patch 2 (v7): Added new patch to warn on missing DESIRED_PERF as suggested by Pierre. - patch 4, 7 (v7): Removed mutex from sysfs store functions as policy->rwsem already provides synchronization. - patch 4 (v7): Added validation checks in store_min/max_perf. Sumit Gupta (7): ACPI: CPPC: Add cppc_get_perf() API to read performance controls ACPI: CPPC: Warn on missing mandatory DESIRED_PERF register 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 | 214 +++++++++++++++++- drivers/cpufreq/cppc_cpufreq.c | 207 ++++++++++++++++- include/acpi/cppc_acpi.h | 40 ++++ 4 files changed, 500 insertions(+), 5 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/20260120145623.2959636-1-sumitg@nvidia.com/ [7] https://lore.kernel.org/lkml/66f58f43-631b-40a0-8d42-4e90cd24b757@arm.com/ -- 2.34.1