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| author | Christoph Hellwig <hch@lst.de> | 2020-03-23 18:19:30 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2020-07-19 09:29:29 +0200 |
| commit | d35834c64820c7ef397f8a244061d4450720540e (patch) | |
| tree | 5a2df279a26c6175bfc9dbf9859c52468967aa70 /kernel/dma/Kconfig | |
| parent | 2f9237d4f6df49b74c51cdac555b0a9979d0c237 (diff) | |
| download | linux-d35834c64820c7ef397f8a244061d4450720540e.tar.gz linux-d35834c64820c7ef397f8a244061d4450720540e.tar.bz2 linux-d35834c64820c7ef397f8a244061d4450720540e.zip | |
dma-mapping: add a dma_ops_bypass flag to struct device
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>
Diffstat (limited to 'kernel/dma/Kconfig')
| -rw-r--r-- | kernel/dma/Kconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig index 5cfb2428593a..f4770fcfa62b 100644 --- a/kernel/dma/Kconfig +++ b/kernel/dma/Kconfig @@ -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 |