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DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Dec 2022 21:42:10.8784 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f80b02c6-045e-4f58-e77f-08dad3e4e727 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d; Ip=[165.204.84.17]; Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT107.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4149 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alex Deucher , Peter Maucher , luben.tuikov@amd.com Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" Add definitions to clarify GPU virtual memory. v2: clarify the terms a bit more Reviewed-by: Luben Tuikov Suggested-by: Peter Maucher Signed-off-by: Alex Deucher --- 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