Re: MI overrides of bus_dma(9), bus_space(9), pci(9)

[Martin Husemann <martin%duskware.de@localhost>]

On Wed, Mar 10, 2010 at 11:30:17PM +0900, Masao Uebayashi wrote:
> Details of architectures and buses.

And also on the device - there might be multiple addresses needed.

> I don't know how multiple MMUs work.

It just means that there is no global view of the VA <-> PA mapping,
especially the device itself might see completely different VAs for the
same PAs as the kernel sees.

I still don't understand how you want to derive that by summing up properties
of parent devices, and what you would do with the sum - you would still
need to create a mapping for the result (and in case of dma convert it to
the proper address the device sees, which is inherently MD).

Martin