On Friday 14 March 2014 12:57 PM, Arnd Bergmann wrote: > On Friday 14 March 2014, Santosh Shilimkar wrote: >> I remember NAKing this approach in past and my stand remains same. >> The cache APIs which you are trying to use here are not suppose >> to be used outside. >> >> I think the right way to fix this is to make use of streaming APIs. >> If needed, IOMMU can have its own dma_ops for special case >> handling if any. >> >> Russell, Arnd might have more ideas. > > I have a bad feeling about using the dma-mapping API within the > IOMMU code, because that driver is also used to implement the > dma-mapping API for devices attached to the IOMMU. It's possible > that it just works. > Thats a good point. > Is the IOMMU actually designed to have page tables in noncoherent > memory? I would have expected that the iopt accesses must all be > done on dma_alloc_coherent() provided memory to guarantee proper > accesses. > At least the OMAP one seems to use non-coherent memory which will need CMO. Regards, Santosh -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
