dma-mapping: add a dma_ops_bypass flag to struct device

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Several IOMMU drivers have a bypass mode where they can use a direct
mapping if the devices DMA mask is large enough.  Add generic support
to the core dma-mapping code to do that to switch those drivers to
a common solution.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>

...

This commit is contained in:

Christoph Hellwig 2020-03-23 18:19:30 +01:00

parent 2f9237d4f6

commit d35834c648

3 changed files with 68 additions and 22 deletions

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8

include/linux/device.h

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8

kernel/dma/Kconfig

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74

kernel/dma/mapping.c

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