swiotlb: refactor coherent buffer allocation

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Factor out a new swiotlb_alloc_buffer helper that allocates DMA coherent
memory from the swiotlb bounce buffer.

This allows to simplify the swiotlb_alloc implemenation that uses
dma_direct_alloc to try to allocate a reachable buffer first.

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 22:15:30 +01:00

parent a25381aa3a

commit 0176adb004

1 changed files with 65 additions and 57 deletions

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lib/swiotlb.c

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