1 =============== 1 ===============
2 AMDGPU Glossary 2 AMDGPU Glossary
3 =============== 3 ===============
4 4
5 Here you can find some generic acronyms used i 5 Here you can find some generic acronyms used in the amdgpu driver. Notice that
6 we have a dedicated glossary for Display Core 6 we have a dedicated glossary for Display Core at
7 'Documentation/gpu/amdgpu/display/dc-glossary. 7 'Documentation/gpu/amdgpu/display/dc-glossary.rst'.
8 8
9 .. glossary:: 9 .. glossary::
10 10
11 active_cu_number 11 active_cu_number
12 The number of CUs that are active on the 12 The number of CUs that are active on the system. The number of active
13 CUs may be less than SE * SH * CU depend 13 CUs may be less than SE * SH * CU depending on the board configuration.
14 14
15 CP 15 CP
16 Command Processor 16 Command Processor
17 17
18 CPLIB 18 CPLIB
19 Content Protection Library 19 Content Protection Library
20 20
21 CU 21 CU
22 Compute Unit 22 Compute Unit
23 23
24 DFS 24 DFS
25 Digital Frequency Synthesizer 25 Digital Frequency Synthesizer
26 26
27 ECP 27 ECP
28 Enhanced Content Protection 28 Enhanced Content Protection
29 29
30 EOP 30 EOP
31 End Of Pipe/Pipeline 31 End Of Pipe/Pipeline
32 32
33 GART 33 GART
34 Graphics Address Remapping Table. This 34 Graphics Address Remapping Table. This is the name we use for the GPUVM
35 page table used by the GPU kernel driver 35 page table used by the GPU kernel driver. It remaps system resources
36 (memory or MMIO space) into the GPU's ad 36 (memory or MMIO space) into the GPU's address space so the GPU can access
37 them. The name GART harkens back to the 37 them. The name GART harkens back to the days of AGP when the platform
38 provided an MMU that the GPU could use t 38 provided an MMU that the GPU could use to get a contiguous view of
39 scattered pages for DMA. The MMU has si 39 scattered pages for DMA. The MMU has since moved on to the GPU, but the
40 name stuck. 40 name stuck.
41 41
42 GC 42 GC
43 Graphics and Compute 43 Graphics and Compute
44 44
45 GMC 45 GMC
46 Graphic Memory Controller 46 Graphic Memory Controller
47 47
48 GPUVM 48 GPUVM
49 GPU Virtual Memory. This is the GPU's M 49 GPU Virtual Memory. This is the GPU's MMU. The GPU supports multiple
50 virtual address spaces that can be in fl 50 virtual address spaces that can be in flight at any given time. These
51 allow the GPU to remap VRAM and system r 51 allow the GPU to remap VRAM and system resources into GPU virtual address
52 spaces for use by the GPU kernel driver 52 spaces for use by the GPU kernel driver and applications using the GPU.
53 These provide memory protection for diff 53 These provide memory protection for different applications using the GPU.
54 54
55 GTT 55 GTT
56 Graphics Translation Tables. This is a 56 Graphics Translation Tables. This is a memory pool managed through TTM
57 which provides access to system resource 57 which provides access to system resources (memory or MMIO space) for
58 use by the GPU. These addresses can be m 58 use by the GPU. These addresses can be mapped into the "GART" GPUVM page
59 table for use by the kernel driver or in 59 table for use by the kernel driver or into per process GPUVM page tables
60 for application usage. 60 for application usage.
61 61
62 IH 62 IH
63 Interrupt Handler 63 Interrupt Handler
64 64
65 HQD 65 HQD
66 Hardware Queue Descriptor 66 Hardware Queue Descriptor
67 67
68 IB 68 IB
69 Indirect Buffer 69 Indirect Buffer
70 70
71 IP 71 IP
72 Intellectual Property blocks 72 Intellectual Property blocks
73 73
74 KCQ 74 KCQ
75 Kernel Compute Queue 75 Kernel Compute Queue
76 76
77 KGQ 77 KGQ
78 Kernel Graphics Queue 78 Kernel Graphics Queue
79 79
80 KIQ 80 KIQ
81 Kernel Interface Queue 81 Kernel Interface Queue
82 82
83 MEC 83 MEC
84 MicroEngine Compute 84 MicroEngine Compute
85 85
86 MES 86 MES
87 MicroEngine Scheduler 87 MicroEngine Scheduler
88 88
89 MMHUB 89 MMHUB
90 Multi-Media HUB 90 Multi-Media HUB
91 91
92 MQD 92 MQD
93 Memory Queue Descriptor 93 Memory Queue Descriptor
94 94
95 PPLib 95 PPLib
96 PowerPlay Library - PowerPlay is the pow 96 PowerPlay Library - PowerPlay is the power management component.
97 97
98 PSP 98 PSP
99 Platform Security Processor 99 Platform Security Processor
100 100
101 RLC 101 RLC
102 RunList Controller 102 RunList Controller
103 103
104 SDMA 104 SDMA
105 System DMA 105 System DMA
106 106
107 SE 107 SE
108 Shader Engine 108 Shader Engine
109 109
110 SH 110 SH
111 SHader array 111 SHader array
112 112
113 SMU 113 SMU
114 System Management Unit 114 System Management Unit
115 115
116 SS 116 SS
117 Spread Spectrum 117 Spread Spectrum
118 118
119 VCE 119 VCE
120 Video Compression Engine 120 Video Compression Engine
121 121
122 VCN 122 VCN
123 Video Codec Next 123 Video Codec Next
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