tree 69da5f20e5354507e3219eaeb6e72b7e5e93f58d
parent a0f2dee0cd651efb5fac6a1d35b0a14460ebcdd4
author Stefano Stabellini <stefano.stabellini@eu.citrix.com> 1416567939 +0000
committer David Vrabel <david.vrabel@citrix.com> 1417696912 +0000

xen/arm: use hypercall to flush caches in map_page

In xen_dma_map_page, if the page is a local page, call the native
map_page dma_ops. If the page is foreign, call __xen_dma_map_page that
issues any required cache maintenane operations via hypercall.

The reason for doing this is that the native dma_ops map_page could
allocate buffers than need to be freed. If the page is foreign we don't
call the native unmap_page dma_ops function, resulting in a memory leak.

Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>