On Thursday, January 18, 2007 1:00 am, Greg KH wrote:
> On Thu, Jan 18, 2007 at 09:14:06AM +0100, Martin Mares wrote:
> > Hello!
> >
> > > I recommend we just delete the pci_bus class. I don't think it
> > > serves any useful purpose. The bridge can be inferred frmo the
> > > sysfs hierarchy (not to mention lspci will tell you). The
> > > cpuaffinity file should be moved from the bus to the device -- it
> > > really doesn't make any sense to talk about which cpu a bus is
> > > affine to, only a device.
> >
> > It doesn't seem to serve any useful purpose other than the affinity
> > now, but I still think that it conceptually belongs there, because
> > it makes sense to have per-bus attributes. For example, in the
> > future we could show data width and signalling speed.
>
> So, if it were to stay, where in the tree should it be? Hanging off
> of the pci device that is the bridge? Or just placing these files
> within the pci device directory itself, as it is the bridge.
>
> There are also some "legacy io" binary sysfs files in these
> directories for those platforms that support it (#ifdef
> HAVE_PCI_LEGACY), and I'm guessing that there is some user for them
> out there, otherwise they would not have been added...
>
> Hm, only ia64 enables that option. Matthew, do you care about those
> files?
Those interfaces could be supported on other platforms (iirc benh has
been planning to add legacy_* support to ppc for awhile). It would be
great if they were supported everywhere to provide userspace with a
fairly sane way to get at this stuff on all Linux systems...
Should be trivial on i386 I think.
Jesse
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