iommu/dma: Refactor iommu_dma_alloc, part 2

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All the logic in iommu_dma_alloc that deals with page allocation from
the CMA or page allocators can be split into a self-contained helper,
and we can than map the result of that or the atomic pool allocation
with the iommu later.  This also allows reusing __iommu_dma_free to
tear down the allocations and MMU mappings when the IOMMU mapping
fails.

Based on a patch from Robin Murphy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Christoph Hellwig 2019-05-20 09:29:42 +02:00 • committed by Joerg Roedel

parent 9ad5d6eddc

commit ee1ef05d02

1 changed files with 35 additions and 30 deletions

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65

drivers/iommu/dma-iommu.c

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