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| author | Liviu Dudau <Liviu.Dudau@arm.com> | 2017-11-10 13:33:10 +0000 |
|---|---|---|
| committer | Noralf Trønnes <noralf@tronnes.org> | 2017-11-15 18:14:46 +0100 |
| commit | 998fb1a0f478b83492220ff79583bf9ad538bdd8 (patch) | |
| tree | 2726e7460e19dbee07402dec75f13522b44c6502 /include/drm | |
| parent | 1f2d9bdc9085a4477a997344b17c40ba2a28d4e4 (diff) | |
| download | op-kernel-dev-998fb1a0f478b83492220ff79583bf9ad538bdd8.zip op-kernel-dev-998fb1a0f478b83492220ff79583bf9ad538bdd8.tar.gz | |
drm: gem_cma_helper.c: Allow importing of contiguous scatterlists with nents > 1
drm_gem_cma_prime_import_sg_table() will fail if the number of entries
in the sg_table > 1. However, you can have a device that uses an IOMMU
engine and can map a discontiguous buffer with multiple entries that
have consecutive sg_dma_addresses, effectively making it contiguous.
Allow for that scenario by testing the entries in the sg_table for
contiguous coverage.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20171110133310.1225-1-Liviu.Dudau@arm.com
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/drm_gem_cma_helper.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/drm/drm_gem_cma_helper.h b/include/drm/drm_gem_cma_helper.h index 76ded75..f191227 100644 --- a/include/drm/drm_gem_cma_helper.h +++ b/include/drm/drm_gem_cma_helper.h @@ -8,7 +8,9 @@ * struct drm_gem_cma_object - GEM object backed by CMA memory allocations * @base: base GEM object * @paddr: physical address of the backing memory - * @sgt: scatter/gather table for imported PRIME buffers + * @sgt: scatter/gather table for imported PRIME buffers. The table can have + * more than one entry but they are guaranteed to have contiguous + * DMA addresses. * @vaddr: kernel virtual address of the backing memory */ struct drm_gem_cma_object { |
