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drm/amdgpu: Use iterator methods exposed by amdgpu_res_cursor.h in building SG_TABLE's for a VRAM BO

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Extend current implementation of SG_TABLE construction method to
allow exportation of sub-buffers of a VRAM BO. This capability will
enable logical partitioning of a VRAM BO into multiple non-overlapping
sub-buffers. One example of this use case is to partition a VRAM BO
into two sub-buffers, one for SRC and another for DST.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Ramesh Errabolu <Ramesh.Errabolu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ramesh Errabolu
2021-04-12 18:23:05 -05:00
committed by Alex Deucher
parent 546aa546b0
commit ba5b662c36
3 changed files with 27 additions and 12 deletions
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4
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
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@@ -291,8 +291,8 @@ static struct sg_table *amdgpu_dma_buf_map(struct dma_buf_attachment *attach,
break;
case TTM_PL_VRAM:
r = amdgpu_vram_mgr_alloc_sgt(adev, &bo->tbo.mem, attach->dev,
dir, &sgt);
r = amdgpu_vram_mgr_alloc_sgt(adev, &bo->tbo.mem, 0,
bo->tbo.base.size, attach->dev, dir, &sgt);
if (r)
return ERR_PTR(r);
break;