RFC: IOMMU bypass

[Stephen Rothwell]

Hi all,

We (Anton Blanchard and others) have been trying to figure out the best
(or any) way to allow for IOMMU bypass when setting up DMA mappings on
particular devices.  Our current idea is to hang a structure of pointers
to DMA mapping operations off the struct device and inherit it from the
device's parent.  This would allow for per-bus (rather than per-bus_type)
mapping operations and also allow a driver to override the bus's
operations for a particular device.

Does this make sense?  Comments (hopefully consructive) please.

Is there a better/simpler/more sensible way to do this?

-- 
Cheers,
Stephen Rothwell                    sfr at canb.auug.org.au
http://www.canb.auug.org.au/~sfr/
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