On Wed, Mar 11, 2020 at 02:51:53PM +0100, Christian König wrote: > This can be used by drivers to setup P2P DMA between device > memory which is not backed by struct pages. > > The drivers of the involved devices are responsible for > setting up and tearing down DMA addresses as necessary > using dma_map_resource(). > > The page pointer is set to NULL and only the DMA address, > length and offset values are valid. NAK. The only valid way to fill DMA address in scatterlists is dma_map_sg / dma_map_sg_attr.
