dma-mapping: move the arm64 noncoherent alloc/free support to common code

The arm64 codebase to implement coherent dma allocation for architectures
with non-coherent DMA is a good start for a generic implementation, given
that is uses the generic remap helpers, provides the atomic pool for
allocations that can't sleep and still is realtively simple and well
tested.  Move it to kernel/dma and allow architectures to opt into it
using a config symbol.  Architectures just need to provide a new
arch_dma_prep_coherent helper to writeback an invalidate the caches
for any memory that gets remapped for uncached access.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 5d065acb6d10..2e645ea693ea 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -82,7 +82,7 @@ config ARM64
         select CRC32
         select DCACHE_WORD_ACCESS
         select DMA_DIRECT_OPS
-        select DMA_REMAP
+        select DMA_DIRECT_REMAP
         select EDAC_SUPPORT
         select FRAME_POINTER
         select GENERIC_ALLOCATOR