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dma-mapping: add a Kconfig symbol to indicate arch_dma_prep_coherent presence

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Add a Kconfig symbol that indicates an architecture provides a
arch_dma_prep_coherent implementation, and provide a stub otherwise.

This will allow the generic dma-iommu code to use it while still
allowing to be built for cache coherent architectures.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig 2019-03-25 15:44:06 +01:00
commit 13bf5ced93
4 changed files with 11 additions and 0 deletions
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3
kernel/dma/Kconfig
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@ -38,6 +38,9 @@ config ARCH_HAS_SYNC_DMA_FOR_CPU
config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
bool
config ARCH_HAS_DMA_PREP_COHERENT
bool
config ARCH_HAS_DMA_COHERENT_TO_PFN
bool