powerpc/iommu: Support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask

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This patch adds the ability to the DMA direct ops to fallback to the IOMMU
ops for coherent alloc/free if the coherent mask of the device isn't
suitable for accessing the direct DMA space and the device also happens
to have an active IOMMU table.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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This commit is contained in:

Benjamin Herrenschmidt 2015-06-24 15:25:31 +10:00 • committed by Michael Ellerman

parent e91c25111a

commit 817820b022

5 changed files with 105 additions and 26 deletions

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4

arch/powerpc/Kconfig

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10

arch/powerpc/include/asm/dma-mapping.h

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2

arch/powerpc/kernel/dma-iommu.c

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4

arch/powerpc/kernel/dma-swiotlb.c

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111

arch/powerpc/kernel/dma.c

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