arm64/iommu: handle non-remapped addresses in ->mmap and ->get_sgtable

commit a98d9ae937d256ed679a935fc82d9deaa710d98e upstream.

DMA allocations that can't sleep may return non-remapped addresses, but
we do not properly handle them in the mmap and get_sgtable methods.
Resolve non-vmalloc addresses using virt_to_page to handle this corner
case.

Change-Id: I0e024fef3a3f9a8b0a6cb0a55545be9497d036e8
Cc: <stable@vger.kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-Commit: cf3780155df66a2df28a0f894d524ea765385f08
Git-Repo: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git


Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>