swiotlb: add common swiotlb_map_ops

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Currently all architectures that want to use swiotlb have to implement
their own dma_map_ops instances.  Provide a generic one based on the
x86 implementation which first calls into dma_direct to try a full blown
direct mapping implementation (including e.g. CMA) before falling back
allocating from the swiotlb buffer.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian König <christian.koenig@amd.com>

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Christoph Hellwig 2018-01-09 16:44:16 +01:00

parent 7f2c8bbd32

commit 251533eb35

2 changed files with 51 additions and 0 deletions

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8

include/linux/swiotlb.h

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43

lib/swiotlb.c

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