linux-kernel - Re: [PATCH] x86/pci: intel bus root res with IOH reading -v2

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Message-ID: <4AD3A460.6060505@zytor.com>
Date:	Mon, 12 Oct 2009 14:49:20 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Ingo Molnar <mingo@...e.hu>, Yinghai Lu <yinghai@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/pci: intel bus root res with IOH reading -v2

On 10/12/2009 02:45 PM, Bjorn Helgaas wrote:
> For the patch in question, we don't even have a root cause for the bug
> (or at least, I couldn't decipher it from the changelog). There's a 
> reference to _CRS being wrong, but we don't currently use _CRS for
> x86 host bridges.
> 
> But in general, my objection is that even if BIOS provides perfectly
> valid information about host bridge apertures, the the fact that Linux
> ignores that information means we have to add this sort of vendor-
> specific code every time we trip over something. And we're tripping
> over things quite often.
> 
> Windows consumes this _CRS information, so while I grant there are
> certainly BIOS bugs there, I think most of the bugs are actually in
> Linux.

I think the right policy for most if not all things should be "use the
BIOS information unless we know better."

	-hpa

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