linux-kernel - Re: [PATCH] x86/pci: try to detect host_bridge pci_cfg

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Message-ID: <20090308145803.GL25995@parisc-linux.org>
Date:	Sun, 8 Mar 2009 08:58:03 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Yinghai Lu <yinghai@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] x86/pci: try to detect host_bridge pci_cfg_space

On Sun, Mar 08, 2009 at 12:04:37PM +0100, Ingo Molnar wrote:
> I'd also suggest to flip around the subject line from x86/pci to 
> pci/x86 - it's more of a PCI patch than a pure x86 patch. The 
> same problem could affect other platforms too i suspect.

Not all platforms expose the root bridge in PCI configuration space.
Intel ia64 platforms do have a materialised root bridge; HP's don't.
(I don't know whether Intel ship any PCIe ia64 machines or not).  I
don't remember details for other platforms, but I think Intel is the odd
one out in this regard.

-- 
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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