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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Zp7ZWN8ncQmla/Y+TlS83z+Xt9uReXjG/olVKngTmlJU4y77IykRVViLSZM2tGlf+vPV5BqguX7qIwBu6rTgU6aCSKRHU6JXxvDjv4e5SyBimX37jWi2Mrkf4dwhN3fgBbTA6FnULgG4fUaDiFW6XBPm9tKro9TuahuCUWKp8F1BVlBJmh/WPBF/Km6HVjEVPJyoHKvWg8a7n64FPc4BaQkGXPA9U5qerfzGKt1dxEvldCys/QYXrdIEgi8Gc0T5iU1BZChje+amQ0L0IWDuSAfJKoQ+Lo2CbKsQSaAiYDc8E8GE2Afg4WIK0iukP5GnBrzh2ptV5MfklcT1QnQrpGtetlMOxDZV7N60Q6UNgsomsXnVbunIhx329ydEBgV0ykr1RSCmcIw20TLhzxI+QSw3LBs5iuylneL5KlFI+3SO7zwbFiLA5i1N0LrmP5hC X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Apr 2026 19:15:02.9241 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b1480b27-6133-4c08-184e-08dea16c9f1d 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: BN1PEPF00004680.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5745 The IORT spec, Issue E.c (ARM DEN 0049E.c, January 2022), bumps the Root Complex Node to revision 4 and adds two PASID descriptors: - PASID Capabilities at byte offset 33 (2 bytes), bits[4:0] of which report the Max PASID Width supported by the Root Complex. - Flags at byte offset 36 (4 bytes), bit 0 of which reports whether the Root Complex itself supports PASID. This is distinct from the existing ATS Attribute bit 2 (at offset 24) that only reports whether the RC forwards PASID information on translated transactions. The ACPICA struct in include/acpi/actbl2.h was updated for the E.c PASID Capabilities descriptor (offset 33) but stops short with a trailing 'u8 reserved[]' flexible array, so the new Flags field at offset 36 is unreachable and the existing ACPI_IORT_PASID_* definitions have no consumer. Replace the trailing flexible array with a fixed 'u8 reserved[1]' followed by 'u32 flags' so the struct fully covers RC node revision 4, and add the ACPI_IORT_RC_PASID_SUPPORTED mask for bit 0 of the new field. With #pragma pack(1) in effect for actbl2.h, this lands the new field at the spec-mandated absolute offset 36. Signed-off-by: Vidya Sagar --- include/acpi/actbl2.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h index 5c0b55e7b3e4..5a4450e66358 100644 --- a/include/acpi/actbl2.h +++ b/include/acpi/actbl2.h @@ -748,7 +748,8 @@ struct acpi_iort_root_complex { u32 pci_segment_number; u8 memory_address_limit; /* Memory address size limit */ u16 pasid_capabilities; /* PASID Capabilities */ - u8 reserved[]; /* Reserved, must be zero */ + u8 reserved[1]; /* Reserved, must be zero */ + u32 flags; /* Flags (IORT E.c, RC node revision >= 4) */ }; /* Masks for ats_attribute field above */ @@ -760,6 +761,9 @@ struct acpi_iort_root_complex { /* Masks for pasid_capabilities field above */ #define ACPI_IORT_PASID_MAX_WIDTH (0x1F) /* Bits 0-4 */ +/* Masks for flags field above */ +#define ACPI_IORT_RC_PASID_SUPPORTED (1) /* The root complex PASID support */ + struct acpi_iort_smmu { u64 base_address; /* SMMU base address */ u64 span; /* Length of memory range */ -- 2.25.1