Add definitions to clarify GPU virtual memory.

v2: clarify the terms a bit more

Reviewed-by: Luben Tuikov <luben.tui...@amd.com>
Suggested-by: Peter Maucher <bellosili...@gmail.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
 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

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