Name

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.

Synopsis

struct sg_table * dma_buf_map_attachment (struct dma_buf_attachment * attach,
 enum dma_data_direction direction);
 

Arguments

attach

[in] attachment whose scatterlist is to be returned

direction

[in] direction of DMA transfer

Description

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.