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| author | Alex Deucher <alexander.deucher@amd.com> | 2022-12-01 16:41:52 -0500 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2022-12-02 10:05:33 -0500 |
| commit | 57f019864b634a3b38f8ab3ebf425695b0607c25 (patch) | |
| tree | 6506a186961fb09785c59e2d80509dac45bf5015 /Documentation/gpu | |
| parent | b35a2a12901cd230309750777e3744fa0526543d (diff) | |
| download | linux-57f019864b634a3b38f8ab3ebf425695b0607c25.tar.gz | |
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
Diffstat (limited to 'Documentation/gpu')
| -rw-r--r-- | Documentation/gpu/amdgpu/amdgpu-glossary.rst | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/gpu/amdgpu/amdgpu-glossary.rst b/Documentation/gpu/amdgpu/amdgpu-glossary.rst index 326896e9800d7f..00a47ebb0b0f46 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 |