drm/amdgpu: add GART, GPUVM, and GTT to glossary

Add definitions to clarify GPU virtual memory.

v2: clarify the terms a bit more

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Luben Tuikov <luben.tuikov@amd.com>
Suggested-by: Peter Maucher <bellosilicio@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20221201214153.8453-1-alexander.deucher@amd.com
This commit is contained in:
Alex Deucher 2022-12-01 16:41:52 -05:00
parent b35a2a1290
commit 57f019864b
1 changed files with 23 additions and 0 deletions

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@ -30,12 +30,35 @@ we have a dedicated glossary for Display Core at
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