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drm/amdgpu: Fail DMABUF map of XGMI-accessible memory

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If peer memory is XGMI-accessible, we should never access it through PCIe
P2P DMA mappings. PCIe P2P is slower, has different coherence behaviour,
limited or no support for atomics, or may not work at all. Fail with a
warning if DMABUF mappings of such memory are attempted.

Signed-off-by: Felix Kuehling <felix.kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit dbe4c63689)
This commit is contained in:
Felix Kuehling
2025-04-17 12:02:09 -04:00
committed by Alex Deucher
parent be593d9d91
commit 9397204ffa
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
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@@ -199,6 +199,11 @@ static struct sg_table *amdgpu_dma_buf_map(struct dma_buf_attachment *attach,
break;
case TTM_PL_VRAM:
/* XGMI-accessible memory should never be DMA-mapped */
if (WARN_ON(amdgpu_dmabuf_is_xgmi_accessible(
dma_buf_attach_adev(attach), bo)))
return ERR_PTR(-EINVAL);
r = amdgpu_vram_mgr_alloc_sgt(adev, bo->tbo.resource, 0,
bo->tbo.base.size, attach->dev,
dir, &sgt);