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Tue, 29 Sep 2026 02:59:32 -0700 From: Aniruddha Rao To: , CC: , , "Aniruddha Rao" Subject: [PATCH v5 0/5] firmware: tegra: bpmp: Add ACPI and MBWT support Date: Tue, 29 Sep 2026 09:59:10 +0000 Message-ID: <20260929095915.2215685-1-anrao@nvidia.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@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-ClientProxiedBy: rnnvmail201.nvidia.com (10.129.68.8) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM2PEPF00003FC6:EE_|SN7PR12MB7275:EE_ X-MS-Office365-Filtering-Correlation-Id: 9ea8eda6-1aee-4065-7ab4-08df1e10653f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|36860700016|376014|1800799024|82310400026|18002099003|6133799003|10067099003|56012099006|11063799006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: oB22F/JfxBKLAT1kzA2OC/O6cO25+EGEiobMlSGDkhuJkSEAcK6Q5qGVlxJVUfFSYl/WsiI/RQhpe7o0lbozTBd5Du0ogFnZNZPQs0/LCob7xjDU/Tcf0DBF3qo8Ke3IE/OKB2gNBVStAHMlw/8fiHRO8zbh/eI3bLukwYRuSnsQPuDI0T3Av9NPFaM3LtIivzhkqigpIQw6b38BF9Lmh3X369pFBinEOZ9xBnskMdyvZxanVNBfuGb30Cj6xHpnNdnhvo8Ot2oDFw5UfxkS/BkVvjgPN5E2C+rGmlguPRkaWyzhNhYTCeXsw/41gdMckQc4GTo5WwXryyDhJRbwl0eal4VF97FkCASZ84hSvnJDBMtBzzE1LFKSS3Nhueg/I1GH/0uyxm+oqo0Sp8O+EOs+5f4iDkp913e/zGNyqvYHjgHSOVeFTgsdW8AunwZy X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Sep 2026 09:59:47.5364 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9ea8eda6-1aee-4065-7ab4-08df1e10653f 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: DM2PEPF00003FC6.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7275 This series adds ACPI support to the Tegra BPMP driver and support for Memory Bandwidth Throttler (MBWT) controls exposed by BPMP firmware of some Tegra platforms. The current BPMP driver depends on device tree bindings. This series keeps the existing DT path unchanged while adding an ACPI transport path for BPMP firmware requests. MBWT controls are accessed through BPMP firmware requests. This series defines the MBWT BPMP ABI, adds MBWT helper functions, and exposes a narrow sysfs interface when firmware reports support for the required MBWT requests. Aniruddha Rao (5): firmware: tegra: bpmp: Move channel initialization to helper firmware: tegra: bpmp: Add ACPI support firmware: tegra: bpmp: Add the Memory Bandwidth Throttler ABI definitions firmware: tegra: bpmp: Add MBWT BPMP helpers firmware: tegra: bpmp: Add MBWT sysfs interface .../ABI/testing/sysfs-platform-tegra-bpmp | 48 ++ drivers/firmware/tegra/Makefile | 1 + drivers/firmware/tegra/bpmp-private.h | 39 ++ drivers/firmware/tegra/bpmp-sysfs.c | 207 +++++++++ drivers/firmware/tegra/bpmp-tegra186.c | 14 + drivers/firmware/tegra/bpmp-tegra210.c | 13 +- drivers/firmware/tegra/bpmp.c | 415 +++++++++++++++--- include/soc/tegra/bpmp-abi.h | 161 ++++++- include/soc/tegra/bpmp.h | 2 + 9 files changed, 849 insertions(+), 51 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-platform-tegra-bpmp create mode 100644 drivers/firmware/tegra/bpmp-sysfs.c Changes since v4: - Move BPMP channel allocation and ping setup/teardown into the SoC-specific init/deinit operations. - Add an optional init_providers operation for DT child and provider registration after BPMP communication is established and the firmware tag is read. - Add an ACPI BPMP init operation for the BMRQ ping path. - Remove ACPI-specific setup and teardown conditionals from the common probe path. - Drop the redundant NULL check after device_get_match_data(). - Explain the transport and provider initialization phases in the ACPI support commit message. - Explain why DT registers an incoming MRQ_PING handler while ACPI only sends an outgoing ping request. - Describe MBWT bandwidth groups and traffic types with platform data so firmware instance and VC type values can vary between platforms. - Document the sysfs hierarchy using platform-defined bandwidth-group and traffic-type names. Changes since v3: - Update the sysfs ABI Documentation date to September 2026 and target release to 7.4. Changes since v2: - Rename the non-ACPI transfer helper to tegra_bpmp_transfer_channel(). - Keep the common BPMP message validation in tegra_bpmp_transfer(). - Remove duplicate message validation from the ACPI transfer helper. - Move the MBWT helpers near probe and document why they are needed. - Rename bpmp-tegra-sysfs.c to bpmp-sysfs.c. Changes since v1: - Dropped the SoC Kconfig patch. - Kept the existing DT path unchanged while adding ACPI support. - Reworked ACPI matching to avoid a dummy ops table. - Added explicit error handling for short ACPI BMRQ responses. - Folded MBWT helpers into bpmp.c. - Reworked MBWT sysfs into per-traffic bandwidth attributes. - Removed software bandwidth range checks. - Use NVCLINK consistently in commit messages and documentation. - Avoid platform-specific or transport-specific MBWT wording. -- 2.43.0