[RFC PATCH] PCI-E broken on PPC (regression)

Matthew Wilcox matthew at wil.cx
Fri Jan 29 14:45:24 EST 2010

On Wed, Jan 27, 2010 at 01:10:56PM +1100, Benjamin Herrenschmidt wrote:
> > Cc'ing Ben for PPC.  Ben, should PPC use pci_scan_device when probing
> > its root busses?  Sounds like it just uses pci_device_add for each one
> > it finds instead?
> > 
> > If you don't actually need scanning (though what about hotplug?) we can
> > move the call to device_add instead...
> Ok so I looked at the code and the problem goes way beyond root busses.
> Basically, powerpc can use the code in arch/powerpc/kernel/pci_of_scan.c
> to "generate" the pci_dev without using config space probing or at least
> using as little of it as possible, using the firmware device-tree
> information instead.
> This is also probably going to be moved to a more generic place and
> extended to be used optionally by other architectures.

Yes, having it under drivers/pci/ somewhere would be a big improvement,
that way we'd actually see it when trying to do cleanups and wouldn't
accidentally break your architectures.

Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."

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