dma_buf_map_attachment —
Returns the scatterlist table of the attachment; mapped into _device_ address space. Is a wrapper for map_dma_buf of the dma_buf_ops.
struct sg_table * dma_buf_map_attachment ( | struct dma_buf_attachment * attach, |
enum dma_data_direction direction); |
attach[in] attachment whose scatterlist is to be returned
direction[in] direction of DMA transfer
Returns sg_table containing the scatterlist to be returned; returns ERR_PTR on error. May return -EINTR if it is interrupted by a signal.
A mapping must be unmapped by using dma_buf_unmap_attachment. Note that
the underlying backing storage is pinned for as long as a mapping exists,
therefore users/importers should not hold onto a mapping for undue amounts of
time.