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

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Message-ID: <49B4330C.1060700@zytor.com>
Date:	Sun, 08 Mar 2009 14:05:16 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Wilcox <matthew@....cx>
CC:	Ingo Molnar <mingo@...e.hu>, Yinghai Lu <yinghai@...nel.org>,
	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

Matthew Wilcox wrote:
> 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.
> 

It's still generic PCI code, however.  If there is no host bridge
exposed in PCI space, the patch is a noop.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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