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drm/amdgpu: fix scatter-gather mapping with user pages
authorShane Francis <bigbeeshane@gmail.com>
Wed, 25 Mar 2020 09:07:40 +0000 (09:07 +0000)
committerAlex Deucher <alexander.deucher@amd.com>
Wed, 25 Mar 2020 16:10:40 +0000 (12:10 -0400)
commit0199172f933342d8b1011aae2054a695c25726f4
tree1574f9a173adbd5530aa4d29dd16e41099fa21bb
parent42e67b479eab6d26459b80b4867298232b0435e7
drm/amdgpu: fix scatter-gather mapping with user pages

Calls to dma_map_sg may return less segments / entries than requested
if they fall on page bounderies. The old implementation did not
support this use case.

Fixes: be62dbf554c5 ("iommu/amd: Convert AMD iommu driver to the dma-iommu api")
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206461
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206895
Bug: https://gitlab.freedesktop.org/drm/amd/issues/1056
Signed-off-by: Shane Francis <bigbeeshane@gmail.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200325090741.21957-3-bigbeeshane@gmail.com
Cc: stable@vger.kernel.org
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c