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Wysocki" CC: Len Brown , Tony Luck , "Punit Agrawal" , , Subject: [PATCH v3 0/2] ACPI: sysfs: Expose BDAT data region Date: Mon, 9 Nov 2026 10:09:43 -0800 Message-ID: <20261109180945.2438349-1-jamien@nvidia.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000037A1:EE_|SN7PR12MB7810:EE_ X-MS-Office365-Filtering-Correlation-Id: 7818b11c-f3f3-4073-6ff3-08df3e8caff0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|1800799024|82310400026|36860700016|261009223027099003|5023799004|11063799006|56012099006|261021121427099003|261021123027099003|261022105027099003|261022075727099003|261026140227099003|261026121527099003|261028144727099003|261102123227099003|10067099003|18002099003|6133799003|13003099007; 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)(23010399003)(376014)(1800799024)(82310400026)(36860700016)(261009223027099003)(5023799004)(11063799006)(56012099006)(261021121427099003)(261021123027099003)(261022105027099003)(261022075727099003)(261026140227099003)(261026121527099003)(261028144727099003)(261102123227099003)(10067099003)(18002099003)(6133799003)(13003099007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: oDjiaQHeapXyHZhAxtKpEIcOXqcBF6IIlaov+1z7VU1Uz9SnOCs6l0E5MC9CeRUP3iqdwQnINpBmKEiMmEaPcPCo4UGbXVz7sOIQkNPfcApMW2x5Nf9z37q5sSziDJkBg2nREvvzZwrigSXlhqRrSCgJK7petR/89QR123royynKcYrwHOzDjhK3LHoPk+6l/HHskqnlfc1R1VM6TfHHg/10rk5H0g/vF4RwO3ExmhxEfiERVYrrHw63vi0yxh02Dq7mAW6s66Sc9G3bzvbaK0oi9KjwZXJzG0O7B8Uii76cMhZVRibPXU+eDg4uqMucLIetH6De0u8z1Sn3zS3W1/XtJMrp83mg0w3wAvqf/NdFTIzoSTqNmQwenAej8l6YubiIaTulRCYwTnmzvxrA6KoJgYzZSzEipsiJBxDmxVyseFUrjgE7z4WIkTLQTLdC X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Nov 2026 18:10:07.7448 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7818b11c-f3f3-4073-6ff3-08df3e8caff0 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: SJ1PEPF000037A1.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7810 The BIOS Data ACPI Table (BDAT) points to a firmware data structure that carries memory training results and other boot-time data. Patch 2 exposes that data as /sys/firmware/acpi/tables/data/BDAT, like the existing BERT and CCEL data files. Patch 1 fixes a leak in the existing data file code, where data_attr is not freed if sysfs_create_bin_file() fails. It moves the file creation and the cleanup into acpi_table_data_init(), and patch 2 builds on that. Changes in v3: - Rebased onto v7.4-rc1, which includes the two fixes posted during the v2 review [1][2]. No code changes. - Dropped the "Assisted-by:" tag as per latest guidelines, though an LLM was used to write, review, and test this series. Changes in v2: - New patch 1, fixing the data_attr leak for BERT and CCEL as well. - Patch 2: the BDAT callback only checks the table and sets the address and size of the data, and returns -ENOMEM if mapping the header fails. v2: https://lore.kernel.org/r/20261012230632.3574987-1-jamien@nvidia.com v1: https://lore.kernel.org/r/20261009232955.866131-1-jamien@nvidia.com [1]: https://lore.kernel.org/r/20261013180728.957618-1-jamien@nvidia.com [2]: https://lore.kernel.org/r/20261013193900.1258808-1-jamien@nvidia.com Tested on an arm64 server (64K pages): - The file matches a /dev/mem dump of the data region taken in the same boot, byte for byte, and decodes with valid CRCs. - With lockdown=integrity, /dev/mem is refused and the file still reads. - Malformed BDAT tables loaded via initrd table upgrade (test-only change adding BDAT to table_sigs[]) are rejected without creating a file: no "BDATHEAD" signature, size below the header, non-memory address space, zero address, and a table shorter than struct acpi_table_bdat. - With a test-only change that makes sysfs_create_bin_file() fail with -EEXIST for one BDAT table, kmemleak reports its data_attr as leaked without patch 1, and the data_attr is freed with patch 1 applied. Jamie Nguyen (2): ACPI: sysfs: Fix data_attr leak when creating a data file fails ACPI: sysfs: Expose BDAT data region Documentation/ABI/testing/sysfs-firmware-acpi | 12 ++++ drivers/acpi/sysfs.c | 69 ++++++++++++++++--- 2 files changed, 71 insertions(+), 10 deletions(-) base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4 -- 2.43.0