dma-direct: add support for CMA allocation
Try the CMA allocator for coherent allocations if supported.
Roughly modelled after the x86 code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Try the CMA allocator for coherent allocations if supported.
Roughly modelled after the x86 code.
Signed-off-by: Christoph Hellwig <hch@lst.de>