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