On Wed, May 24, 2017 at 11:24:27AM +0100, Vladimir Murzin wrote: > This patch adds a simple implementation of mmap to dma_noop_ops.
Currently we use dma_common_mmap as the generic fallback if a dma_ops instance doesn't implement a mmap method. Can you just fix up dma_common_mmap for your nommu case - it looks like yours is basically a subset. In fact I suspect yours should call dma_mmap_from_coherent as well, so the only different is the lack of pgprot_noncached call.
