Add definitions to clarify GPU virtual memory.
v2: clarify the terms a bit more
Reviewed-by: Luben Tuikov <luben.tuikov@xxxxxxx>
Suggested-by: Peter Maucher <bellosilicio@xxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
Documentation/gpu/amdgpu/amdgpu-glossary.rst | 23 ++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/Documentation/gpu/amdgpu/amdgpu-glossary.rst b/Documentation/gpu/amdgpu/amdgpu-glossary.rst
index 326896e9800d..00a47ebb0b0f 100644
--- a/Documentation/gpu/amdgpu/amdgpu-glossary.rst
+++ b/Documentation/gpu/amdgpu/amdgpu-glossary.rst
@@ -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
--
2.38.1
