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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