Commit 13bf5ced authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

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



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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarRobin Murphy <robin.murphy@arm.com>
parent 148a97d5

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ config ARM64 
	select ARCH_HAS_DEVMEM_IS_ALLOWED

	select ARCH_HAS_DMA_COHERENT_TO_PFN

	select ARCH_HAS_DMA_MMAP_PGPROT

	select ARCH_HAS_DMA_PREP_COHERENT

	select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI

	select ARCH_HAS_ELF_RANDOMIZE

	select ARCH_HAS_FAST_MULTIPLIER

arch/csky/Kconfig

+1 −0
Original line number Diff line number Diff line 
config CSKY

	def_bool y

	select ARCH_32BIT_OFF_T

	select ARCH_HAS_DMA_PREP_COHERENT

	select ARCH_HAS_SYNC_DMA_FOR_CPU

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE

	select ARCH_USE_BUILTIN_BSWAP

include/linux/dma-noncoherent.h

+6 −0
Original line number Diff line number Diff line
@@ -72,6 +72,12 @@ static inline void arch_sync_dma_for_cpu_all(struct device *dev) 
}

#endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */



#ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT

void arch_dma_prep_coherent(struct page *page, size_t size);

#else

static inline void arch_dma_prep_coherent(struct page *page, size_t size)

{

}

#endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */



#endif /* _LINUX_DMA_NONCOHERENT_H */

kernel/dma/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -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

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