swiotlb-xen: simplify the DMA sync method implementations

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Get rid of the grand multiplexer and implement the sync_single_for_cpu
and sync_single_for_device methods directly, and then loop over them
for the scatterlist based variants.

Note that this also loses a few comments related to highlevel DMA API
concepts, which have nothing to do with the swiotlb-xen implementation
details.

Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

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Christoph Hellwig 2019-04-11 09:19:59 +02:00 • committed by Konrad Rzeszutek Wilk

parent 8b35d9feed

commit 2e12dceef3

1 changed files with 28 additions and 56 deletions

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drivers/xen/swiotlb-xen.c

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