1What: /sys/kernel/debug/iommu/amd/iommu<x>/mmio 2Date: January 2025 3Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com> 4Description: 5 This file provides read/write access for user input. Users specify the 6 MMIO register offset for iommu<x>, and the file outputs the corresponding 7 MMIO register value of iommu<x> 8 9 Example:: 10 11 $ echo "0x18" > /sys/kernel/debug/iommu/amd/iommu00/mmio 12 $ cat /sys/kernel/debug/iommu/amd/iommu00/mmio 13 14 Output:: 15 16 Offset:0x18 Value:0x000c22000003f48d 17 18What: /sys/kernel/debug/iommu/amd/iommu<x>/capability 19Date: January 2025 20Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com> 21Description: 22 This file provides read/write access for user input. Users specify the 23 capability register offset for iommu<x>, and the file outputs the 24 corresponding capability register value of iommu<x>. 25 26 Example:: 27 28 $ echo "0x10" > /sys/kernel/debug/iommu/amd/iommu00/capability 29 $ cat /sys/kernel/debug/iommu/amd/iommu00/capability 30 31 Output:: 32 33 Offset:0x10 Value:0x00203040 34 35What: /sys/kernel/debug/iommu/amd/iommu<x>/cmdbuf 36Date: January 2025 37Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com> 38Description: 39 This file is a read-only output file containing iommu<x> command 40 buffer entries. 41 42 Examples:: 43 44 $ cat /sys/kernel/debug/iommu/amd/iommu<x>/cmdbuf 45 46 Output:: 47 48 CMD Buffer Head Offset:339 Tail Offset:339 49 0: 00835001 10000001 00003c00 00000000 50 1: 00000000 30000005 fffff003 7fffffff 51 2: 00835001 10000001 00003c01 00000000 52 3: 00000000 30000005 fffff003 7fffffff 53 4: 00835001 10000001 00003c02 00000000 54 5: 00000000 30000005 fffff003 7fffffff 55 6: 00835001 10000001 00003c03 00000000 56 7: 00000000 30000005 fffff003 7fffffff 57 8: 00835001 10000001 00003c04 00000000 58 9: 00000000 30000005 fffff003 7fffffff 59 10: 00835001 10000001 00003c05 00000000 60 11: 00000000 30000005 fffff003 7fffffff 61 [...] 62 63What: /sys/kernel/debug/iommu/amd/devid 64Date: January 2025 65Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com> 66Description: 67 This file provides read/write access for user input. Users specify the 68 device ID, which can be used to dump IOMMU data structures such as the 69 interrupt remapping table and device table. 70 71 Example: 72 73 1. 74 :: 75 76 $ echo 0000:01:00.0 > /sys/kernel/debug/iommu/amd/devid 77 $ cat /sys/kernel/debug/iommu/amd/devid 78 79 Output:: 80 81 0000:01:00.0 82 83 2. 84 :: 85 86 $ echo 01:00.0 > /sys/kernel/debug/iommu/amd/devid 87 $ cat /sys/kernel/debug/iommu/amd/devid 88 89 Output:: 90 91 0000:01:00.0 92 93What: /sys/kernel/debug/iommu/amd/devtbl 94Date: January 2025 95Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com> 96Description: 97 This file is a read-only output file containing the device table entry 98 for the device ID provided in /sys/kernel/debug/iommu/amd/devid. 99 100 Example:: 101 102 $ cat /sys/kernel/debug/iommu/amd/devtbl 103 104 Output:: 105 106 DeviceId QWORD[3] QWORD[2] QWORD[1] QWORD[0] iommu 107 0000:01:00.0 0000000000000000 20000001373b8013 0000000000000038 6000000114d7b603 iommu3 108 109What: /sys/kernel/debug/iommu/amd/irqtbl 110Date: January 2025 111Contact: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com> 112Description: 113 This file is a read-only output file containing valid IRT table entries 114 for the device ID provided in /sys/kernel/debug/iommu/amd/devid. 115 116 Example:: 117 118 $ cat /sys/kernel/debug/iommu/amd/irqtbl 119 120 Output:: 121 122 DeviceId 0000:01:00.0 123 IRT[0000] 0000000000000020 0000000000000241 124 IRT[0001] 0000000000000020 0000000000000841 125 IRT[0002] 0000000000000020 0000000000002041 126 IRT[0003] 0000000000000020 0000000000008041 127 IRT[0004] 0000000000000020 0000000000020041 128 IRT[0005] 0000000000000020 0000000000080041 129 IRT[0006] 0000000000000020 0000000000200041 130 IRT[0007] 0000000000000020 0000000000800041 131 [...] 132