Re: How to replace bus_to_virt()?

[Stefan Richter]

Arjan van de Ven wrote:
> On Sun, 2006-04-30 at 16:52 +0200, Stefan Richter wrote:
> > is there a *direct* future-proof replacement for bus_to_virt()?
> >
> > It appears there are already architectures which do not define a 
> > bus_to_virt() funtion or macro. If there isn't a direct replacement, is 
> > there at least a way to detect at compile time whether bus_to_virt() exists?
>
>
> I'd go one step further: given a world with iommu's, and multiple pci
> domains etc, how can you know there even IS such a translation possible
> (without first having set it up from the other direction)?

Well, we actually do set it up from the other direction. But in a way 
that does not work with IOMMUs...

AFAIU, the patch "dc395x: dynamically map scatter-gather for PIO" [1] by 
Guennadi Liakhovetski is dealing with the same issue. I am not yet clear 
whether I could adopt this method for sbp2.
[1] http://marc.theaimsgroup.com/?l=linux-scsi&t=114400790300004
--
Stefan Richter
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