Re: [PATCH] add PCI API to sysfs

From: Benjamin Herrenschmidt
Date: Tue Dec 21 2004 - 11:15:52 EST

On Tue, 2004-12-21 at 12:31 +0000, Matthew Wilcox wrote:
> On Tue, Dec 21, 2004 at 08:12:01AM +0100, Benjamin Herrenschmidt wrote:
> > treat all busses of a domain the same, but it leaves us with the
> > necessary flexibility for setups with bridges that can remap the legacy
> > space or that kind of thing.
> Do any such bridges exist? I've never heard of them. io space accesses
> are implemented by the host bridge, so I think the most generic we need
> to support is one per host bridge, ie root bus.

I've seen PCI->ISA stuffs that could remap the legacy ISA memory space
at some random place, though don't ask me the details, I forgot.

Also, per-bus avoids the work of having to walk the tree up, etc... and
doesn't make thing more complicated for the sysfs code so ...


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