tree 82194a886cb05fe27ba3ddf0dca4ec05c3977e4a
parent b2776bf7149bddd1f4161f14f79520f17fc1d71d
author Lars-Peter Clausen <lars@metafoo.de> 1417619248 +0100
committer Michal Simek <michal.simek@xilinx.com> 1418817599 +0100

microblaze: Fix mmap for cache coherent memory

When running in non-cache coherent configuration the memory that was
allocated with dma_alloc_coherent() has a custom mapping and so there is no
1-to-1 relationship between the kernel virtual address and the PFN. This
means that virt_to_pfn() will not work correctly for those addresses and the
default mmap implementation in the form of dma_common_mmap() will map some
random, but not the requested, memory area.

Fix this by providing a custom mmap implementation that looks up the PFN
from the page table rather than using virt_to_pfn.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>