Re: [PATCH 0/5][RFC] Physical PCI slot objects

Kristen Carlson Accardi
2007-11-14T18:38:48Z

On Wed, 14 Nov 2007 18:55:21 +0900
Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> wrote:

> Matthew Wilcox ????????:
> > On Tue, Nov 13, 2007 at 03:33:14PM -0800, Kristen Carlson Accardi wrote:
> >> As far as being able to retrieve the slot number (which it seemed from
> >> the HP manageablity application perspective is the goal here), that
> >> information is available from userspace as well for at least standard PCI
> >> and pcie based systems for occupied slots. For standard pci, you have
> >> to make something up anyway - for shpchp we just use an incremental
> >> number and combine it with the bus number to represent the slot. For
> >> pcie, you can get this info from the slot capabilities register.
> >
> > Ummm ... that's not what the /spec/ says. I've never worked on any shpc
> > machines, but the shpc driver reads the slot values from the SLOT_CONFIG
> > register, just like the spec says to.
> >
>
> The slot number for shpc slot is like 'YYYY_XXXX'.
>
> YYYY is the bus number, though I don't know the specific reason
> why it was added.
>
> XXXX is slot number decided according to the shpc specification,
> as you said.
>
> Thanks,
> Kenji Kaneshige
>

Kenji is correct, you should listen to him, not me :).

For standard PCI slots that are not hotplug, I would think you'd need
firware support to find the slot numbers -- but I'm not sure on this.

btw - the YYYY was added to prevent duplicate slot numbers on buggy
machines btw.