Repost due to a dumb bug that was introduced in vb2_dma_sg_get_userptr and
which is now fixed.
- Add allocation context to dma-sg and have vb2 do the dma mapping instead of
the driver. This makes it consistent with the way dma-contig behaves and
simplifies drivers.
- Add support for DMABUF
- Add allocation context to dma-sg and have vb2 do the dma mapping instead of
the driver. This makes it consistent with the way dma-contig behaves and
simplifies drivers.
- Add support for DMABUF import to dma-sg.
- Add support for DMABUF export to dma-sg and dma-vmalloc.
- Clarify (and fix)
