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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jun 2025 16:39:31.9484 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8a94430f-bb9c-4c91-3414-08dda38661f6 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000075F0.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4382 Content-Type: text/plain; charset="utf-8" Add documentation describing how to use AMD IOMMU debugfs support to dump IOMMU data structures - IRT table, Device table, Registers (MMIO and Capability) and command buffer. Signed-off-by: Dheeraj Kumar Srivastava --- Documentation/ABI/testing/debugfs-amd-iommu | 114 ++++++++++++++++++++ 1 file changed, 114 insertions(+) create mode 100644 Documentation/ABI/testing/debugfs-amd-iommu diff --git a/Documentation/ABI/testing/debugfs-amd-iommu b/Documentation/AB= I/testing/debugfs-amd-iommu new file mode 100644 index 000000000000..7d6cf1f602ed --- /dev/null +++ b/Documentation/ABI/testing/debugfs-amd-iommu @@ -0,0 +1,114 @@ +What: /sys/kernel/debug/iommu/amd/iommu/mmio +Date: January 2025 +Contact: Dheeraj Kumar Srivastava +Description: + This is an input read/write access file. In this file, the user input + mmio register offset for iommu to print corresponding mmio register + of iommu. + + Example: + $ echo "0x18" > /sys/kernel/debug/iommu/amd/iommu00/mmio + $ cat /sys/kernel/debug/iommu/amd/iommu00/mmio + + Output: + Offset:0x18 Value:0x000c22000003f48d + +What: /sys/kernel/debug/iommu/amd/iommu/capability +Date: January 2025 +Contact: Dheeraj Kumar Srivastava +Description: + This is an input read/write access file. In this file, the user input + capability register offset for iommu to print correspon= ding capability + register of iommu. + + Example: + $ echo "0x10" > /sys/kernel/debug/iommu/amd/iommu00/capability + $ cat /sys/kernel/debug/iommu/amd/iommu00/capability + + Output: + Offset:0x10 Value:0x00203040 + +What: /sys/kernel/debug/iommu/amd/iommu/cmdbuf +Date: January 2025 +Contact: Dheeraj Kumar Srivastava +Description: + This file is an output read only file that contains iommu command + buffer entries. + + Examples: + $ cat /sys/kernel/debug/iommu/amd/iommu/cmdbuf + + Output: + CMD Buffer Head Offset:339 Tail Offset:339 + 0: 00835001 10000001 00003c00 00000000 + 1: 00000000 30000005 fffff003 7fffffff + 2: 00835001 10000001 00003c01 00000000 + 3: 00000000 30000005 fffff003 7fffffff + 4: 00835001 10000001 00003c02 00000000 + 5: 00000000 30000005 fffff003 7fffffff + 6: 00835001 10000001 00003c03 00000000 + 7: 00000000 30000005 fffff003 7fffffff + 8: 00835001 10000001 00003c04 00000000 + 9: 00000000 30000005 fffff003 7fffffff + 10: 00835001 10000001 00003c05 00000000 + 11: 00000000 30000005 fffff003 7fffffff + [...] + +What: /sys/kernel/debug/iommu/amd/devid +Date: January 2025 +Contact: Dheeraj Kumar Srivastava +Description: + This is an input read/write file that takes device id user input. + This input can be used for dumping iommu data structures like + interrupt remapping table, device table etc. + + Example: + 1. + $ echo 0000:01:00.0 > /sys/kernel/debug/iommu/amd/devid + $ cat /sys/kernel/debug/iommu/amd/devid + + Output: + 0000:01:00.0 + + 2. + $ echo 01:00.0 > /sys/kernel/debug/iommu/amd/devid + $ cat /sys/kernel/debug/iommu/amd/devid + + Output: + 0000:01:00.0 + +What: /sys/kernel/debug/iommu/amd/devtbl +Date: January 2025 +Contact: Dheeraj Kumar Srivastava +Description: + This is an output read only file that contains device table entry for + the device id input given in /sys/kernel/debug/iommu/amd/devid. + + Example: + $ cat /sys/kernel/debug/iommu/amd/devtbl + + Output: + DeviceId QWORD[3] QWORD[2] QWORD[1] = QWORD[0] iommu + 0000:01:00.0 0000000000000000 20000001373b8013 0000000000000038 60000001= 14d7b603 iommu3 + +What: /sys/kernel/debug/iommu/amd/irqtbl +Date: January 2025 +Contact: Dheeraj Kumar Srivastava +Description: + This is an output read only file that contains IRT table valid entries + for the device id input given in /sys/kernel/debug/iommu/amd/devid. + + Example: + $ cat /sys/kernel/debug/iommu/amd/irqtbl + + Output: + DeviceId 0000:01:00.0 + IRT[0000] 0000000000000020 0000000000000241 + IRT[0001] 0000000000000020 0000000000000841 + IRT[0002] 0000000000000020 0000000000002041 + IRT[0003] 0000000000000020 0000000000008041 + IRT[0004] 0000000000000020 0000000000020041 + IRT[0005] 0000000000000020 0000000000080041 + IRT[0006] 0000000000000020 0000000000200041 + IRT[0007] 0000000000000020 0000000000800041 + [...] --=20 2.25.1