linux-kernel - Re: [PATCH -v2] x86, pci: Handle fallout pci devices with peer root bus

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Date:	Mon, 14 Jun 2010 14:10:20 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Yinghai Lu <yinghai.lu@...cle.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Graham Ramsey <ramsey.graham@...world.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Robert Richter <robert.richter@....com>,
	Harald Welte <HaraldWelte@...tech.com>,
	Joseph Chan <JosephChan@....com.tw>,
	Jiri Slaby <jslaby@...e.cz>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dominik Brodowski <linux@...inikbrodowski.net>
Subject: Re: [PATCH -v2] x86, pci: Handle fallout pci devices with peer root
 bus

On 06/14/2010 01:20 PM, Bjorn Helgaas wrote:
> 
> OK, but Graham's system doesn't have anything resembling a PCI-to-PCI
> bridge leading to bus 80.  So while I agree that in an ideal world,
> HT/PCI host bridges might always look like PCI-to-PCI bridges, it
> seems this is not the case in practice.
> 

Invisible PCI bridges have been known to occur in pure PCI space, too.

> Yes, absolutely.  My point is that what the HT spec means by "host bridge"
> is not the same as what the PCI spec and Linux mean by "PCI host bridge".

Actually, they're *exactly* the same thing.

	-hpa
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