xen/arm64: do not call the swiotlb functions twice
authorStefano Stabellini <stefano.stabellini@eu.citrix.com>
Mon, 9 Dec 2013 15:55:11 +0000 (15:55 +0000)
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>
Wed, 11 Dec 2013 16:21:00 +0000 (16:21 +0000)
commit02ab71cdae248533620abefa1d46097581457110
tree9304a15a0f04b931e66980f367760626117aa555
parentb6497b383f65dd1bc60ea1f5d70e157a268fbd15
xen/arm64: do not call the swiotlb functions twice

On arm64 the dma_map_ops implementation is based on the swiotlb.
swiotlb-xen, used by default in dom0 on Xen, is also based on the
swiotlb.

Avoid calling into the default arm64 dma_map_ops functions from
xen_dma_map_page, xen_dma_unmap_page, xen_dma_sync_single_for_cpu, and
xen_dma_sync_single_for_device otherwise we end up calling into the
swiotlb twice.

When arm64 gets a non-swiotlb based implementation of dma_map_ops, we'll
probably have to reintroduce dma_map_ops calls in page-coherent.h.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
CC: catalin.marinas@arm.com
CC: Will.Deacon@arm.com
CC: Ian.Campbell@citrix.com
arch/arm64/include/asm/xen/page-coherent.h