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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
kernel/dma/Kconfig
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@@ -8,6 +8,14 @@ config HAS_DMA
config DMA_OPS
bool
#
# IOMMU drivers that can bypass the IOMMU code and optionally use the direct
# mapping fast path should select this option and set the dma_ops_bypass
# flag in struct device where applicable
#
config DMA_OPS_BYPASS
bool
config NEED_SG_DMA_LENGTH
bool