Messages in this thread | | | Subject | Re: [PATCH] add PCI API to sysfs | From | Benjamin Herrenschmidt <> | Date | Tue, 21 Dec 2004 17:13:58 +0100 |
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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 ...
Ben
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