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Message-ID: <20250317115830.3416-9-dheerajkumar.srivastava@amd.com> Date: Mon, 17 Mar 2025 17:28:30 +0530 From: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com> To: <joro@...tes.org>, <will@...nel.org>, <robin.murphy@....com>, <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev> CC: <suravee.suthikulpanit@....com>, <vasant.hegde@....com>, "Dheeraj Kumar Srivastava" <dheerajkumar.srivastava@....com> Subject: [PATCH v4 8/8] iommu/amd: Add documentation for AMD IOMMU debugfs support 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 <dheerajkumar.srivastava@....com> --- 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/ABI/testing/debugfs-amd-iommu new file mode 100644 index 000000000000..49efc74c8e6f --- /dev/null +++ b/Documentation/ABI/testing/debugfs-amd-iommu @@ -0,0 +1,114 @@ +What: /sys/kernel/debug/iommu/amd/iommu<x>/mmio +Date: September 2024 +Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com> +Description: + This is an input read/write access file. In this file, the user input + mmio register offset for iommu<x> to print corresponding mmio register + of iommu<x>. + + 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<x>/capability +Date: September 2024 +Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com> +Description: + This is an input read/write access file. In this file, the user input + capability register offset for iommu<x> to print corresponding capability + register of iommu<x>. + + 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<x>/cmdbuf +Date: September 2024 +Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com> +Description: + This file is an output read only file that contains iommu<x> command + buffer entries. + + Examples: + $ cat /sys/kernel/debug/iommu/amd/iommu<x>/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: September 2024 +Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com> +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: September 2024 +Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com> +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 6000000114d7b603 iommu3 + +What: /sys/kernel/debug/iommu/amd/irqtbl +Date: September 2024 +Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com> +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 + [...] -- 2.25.1
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