Re: cleanup the dma_pgprot handling
From: Christoph Hellwig <hch@lst.de>
Date: 2019-08-24 22:34:56
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linux-iommu, linux-mips, linuxppc-dev, lkml
On Fri, Aug 23, 2019 at 09:58:04PM +0000, Paul Burton wrote:
So I believe uncached & uncached accelerated are another case like that described above - they're 2 different CCAs but the same "access type", namely uncached. Section 4.9 then goes on to forbid mixing access types, but not CCAs. It would be nice if the precise mapping from CCA to access type was provided, but I don't see that anywhere. I can check with the architecture team to be sure, but to my knowledge we're fine to mix access via kseg1 (ie. uncached) & mappings with CCA=7 (uncached accelerated).
Ok. Looks like we can keep it then and I'll add a comment to the code with the above reference. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel