linux-kernel - Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver opt-in

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Date:	Fri, 11 Jan 2008 16:26:38 -0800
From:	Greg KH <greg@...ah.com>
To:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Cc:	Matthew Wilcox <matthew@....cx>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Mares <mj@....cz>, Tony Camuso <tcamuso@...hat.com>
Subject: Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver
	opt-in

On Sat, Jan 12, 2008 at 02:58:56AM +0300, Ivan Kokshaysky wrote:
> On Fri, Jan 11, 2008 at 02:38:03PM -0700, Matthew Wilcox wrote:
> > On Fri, Jan 11, 2008 at 01:28:30PM -0800, Linus Torvalds wrote:
> > > Hmm. Were all those reports root-caused to just that BAR probing? If so, 
> > > we may be in better shape than I worried.
> > 
> > I believe so.
> 
> Ditto.
> 
> One typical problem is that on "Intel(r) 3 Series Experss Chipset Family"
> MMCONFIG probing of the BAR #2 (frame buffer address) of integrated graphics
> device locks up the machine (depending on BIOS settings, of course).
> This happens because the frame buffer of IGD has higher decode priority
> than MMCONFIG range, as stated in Intel docs...

Ok, so what would the proposed patch look like to help resolve this?

Ivan, you posted one a while ago, but never seemed to get any
confirmation if it helped or not.  Should I use that and drop Arjan's?
Or use both?  Or something else like the patches proposed by Tony
Camuso?

thanks,

greg k-h
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