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RFC How to pass IOMMU map attr via DMA API?

Joerg Roedel linux-arm-kernel linux-iommu linux-tegra 1 version New

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  1. v1 RFC Latest0 of 3 patches 0 repliesNew

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Cover letter [RFC 0/3] How to pass IOMMU map attr via DMA API?
Quoted 5 lines · Marek Szyprowski

Using DMA attributes for this seems to be a bad idea. The dma direction parameter is much more appropriate. Will Deacon recently posted a patch which does it right, see:

https://git.linaro.org/gitweb?p=people/mszyprowski/linux-dma-mapping.git;a=commit;h=8fc3749bd31d139db58f874e093255fe62505968

Agreed, that is one usecase the dma-direction parameter was made for. In particular:

	DMA_FROM_DEVICE		-> Write only mapping
	DMA_TO_DEVICE 		-> Read only mapping
	DMA_BIDIRECTIONAL	-> Read/Write mapping

So no need to use the dma attributes for that.

Joerg

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