AMDGPU Glossary¶
Here you can find some generic acronyms used in the amdgpu driver. Notice that we have a dedicated glossary for Display Core at 'DC Glossary'.
- active_cu_number
The number of CUs that are active on the system. The number of active CUs may be less than SE * SH * CU depending on the board configuration.
- CP
Command Processor
- CPLIB
Content Protection Library
- CU
Compute Unit
- DFS
Digital Frequency Synthesizer
- ECP
Enhanced Content Protection
- EOP
End Of Pipe/Pipeline
- GART
Graphics Address Remapping Table. This is the name we use for the GPUVM page table used by the GPU kernel driver. It remaps system resources (memory or MMIO space) into the GPU's address space so the GPU can access them. The name GART harkens back to the days of AGP when the platform provided an MMU that the GPU could use to get a contiguous view of scattered pages for DMA. The MMU has since moved on to the GPU, but the name stuck.
- GC
Graphics and Compute
- GMC
Graphic Memory Controller
- GPUVM
GPU Virtual Memory. This is the GPU's MMU. The GPU supports multiple virtual address spaces that can be in flight at any given time. These allow the GPU to remap VRAM and system resources into GPU virtual address spaces for use by the GPU kernel driver and applications using the GPU. These provide memory protection for different applications using the GPU.
- GTT
Graphics Translation Tables. This is a memory pool managed through TTM which provides access to system resources (memory or MMIO space) for use by the GPU. These addresses can be mapped into the "GART" GPUVM page table for use by the kernel driver or into per process GPUVM page tables for application usage.
- IH
Interrupt Handler
- HQD
Hardware Queue Descriptor
- IB
Indirect Buffer
- IP
Intellectual Property blocks
- KCQ
Kernel Compute Queue
- KGQ
Kernel Graphics Queue
- KIQ
Kernel Interface Queue
- MEC
MicroEngine Compute
- MES
MicroEngine Scheduler
- MMHUB
Multi-Media HUB
- MQD
Memory Queue Descriptor
- PPLib
PowerPlay Library - PowerPlay is the power management component.
- PSP
Platform Security Processor
- RLC
RunList Controller
- SDMA
System DMA
- SE
Shader Engine
- SH
SHader array
- SMU
System Management Unit
- SS
Spread Spectrum
- VCE
Video Compression Engine
- VCN
Video Codec Next