/proc/bus/pci and domains

Martin Mares mj at ucw.cz
Thu Feb 14 20:40:22 EST 2008


Hi Greg!

> I have no idea, it sounds like a PPC specific thing, not anything the
> PCI core does, right?  So I'll add the ppc list to the cc: and ask if
> anyone there has any ideas?

Unfortunately, this is not PPC specific at all -- proc_attach_device()
calls pci_proc_domain(bus), which is an arch-specific hook turning on
the weird behavior I described. This hook can return non-zero even on
x86 if there are buses outside domain 0.

I think that the hook itself is correct, it only should trigger more
consistent behavior of the generic code :)

Would it be acceptable for the PPC folks to modify the code to add
domain numbers to the device numbers in /proc/bus/pci/devices in the
same format as the bus directories already have?

If so, I will cook up a patch.

				Have a nice fortnight
-- 
Martin `MJ' Mares                          <mj at ucw.cz>   http://mj.ucw.cz/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
"Dijkstra probably hates me." -- /usr/src/linux/kernel/sched.c



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