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.
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.
Arnd
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