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

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Date:	Wed, 14 Nov 2007 10:38:09 -0800
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Cc:	Matthew Wilcox <matthew@....cx>, Greg KH <gregkh@...e.de>,
	Rick Jones <rick.jones2@...com>, Greg KH <greg@...ah.com>,
	Alex Chiang <achiang@...com>, lenb@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	pcihpd-discuss@...ts.sourceforge.net, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 0/5][RFC] Physical PCI slot objects

On Wed, 14 Nov 2007 18:55:21 +0900
Kenji Kaneshige <kaneshige.kenji@...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.
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