linux-kernel - Re: PCI resource problems caused by improper address rounding

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Message-ID: <20071220215204.GA5636@twiddle.net>
Date:	Thu, 20 Dec 2007 13:52:04 -0800
From:	Richard Henderson <rth@...ddle.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Chuck Ebbert <cebbert@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Daniel Ritz <daniel.ritz@....ch>, Greg KH <greg@...ah.com>,
	Keith Packard <keithp@...thp.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>
Subject: Re: PCI resource problems caused by improper address rounding

On Tue, Dec 18, 2007 at 05:38:58PM -0800, Linus Torvalds wrote:
> That
> 
> 	PCI: Cannot allocate resource region 9 of bridge 0000:00:01.0
> 	PCI: Cannot allocate resource region 1 of device 0000:01:00.0
> 
> thing is really starting to bug me.
> 
> I bet that is the real problem here, but it's not printing out enough 
> information about the resource to actually give us much of a clue about 
> what is wrong.
> 
> I suspect that it had a bridge mapping (device 0:01.0) that included the 
> range from 0xc0000000 to 0xcfffffff, but there was something stupid wrong 
> with it (eg the BIOS had allocated overlapping regions), so we disabled 
> it. That, in turn, then caused us to also refuse the existing 0xc0000000 
> mapping for the graphics card (device 01:00.0), because now there was no 
> valid resource for it.

That is exactly it.  The relevant section of the debug info is

PCI: Bridge 0000:00:01.0
PCI: Bridge resource 7 00008000-00008fff (%f=100)
PCI: Bridge resource 8 f7d00000-fddfffff (%f=200)
PCI: Bridge resource 9 bdf00000-ddefffff (%f=1201)

The bridge was assigned to a piece of the end of physical memory.  



r~
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