> Even if it's tree, only each IOMMU knows what's the best. That's the
quoted text
> point of these changes to remove the tricks in arch/x86/pci-dma.c and
> let IOMMUs do what they want.

Duplicating all the code.  Sounds great.
 
quoted text
> > Also there's usually the problem that not all busses are translated,
> > e.g. Calgary used to do that so for e.g. dev == NULL allocations you had
> > to use  these fallback algorithms anyways.
> 
> dev == NULL isn't a minor thing. It's just using the fallback
> device.

You still have to handle it fully.

-Andi
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