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

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Message-ID: <20071222064719.73fdd9a4@laptopd505.fenrus.org>
Date:	Sat, 22 Dec 2007 06:47:19 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	linux-kernel@...r.kernel.org, gregkh@...e.de,
	linux-pci@...ey.karlin.mff.cuni.cz, torvalds@...ux-foundation.org
Subject: Re: [patch] Make MMCONFIG space (extended PCI config space) a
 driver opt-in issue

On Sat, 22 Dec 2007 09:20:06 -0500
Jeff Garzik <jeff@...zik.org> wrote:

> Arjan van de Ven wrote:
> > Hi,
> > 
> > Linus really wants the extended (4Kb) PCI configuration space
> > (using MCFG acpi table etc) to be opt-in, since there's many issues
> > with it and most drivers don't even use/need it. The idea behind
> > opt-in is that if you don't use it, you don't get to suffer the
> > bugs...
> > 
> > Booted on my 64 bit test machine; sadly it has a defunct BIOS that
> > doesn't have a working MCFG.
> > 
> > 
> > From: Arjan van de Ven <arjan@...ux.intel.com>
> > Subject: Make MMCONFIG space a driver opt-in
> > 
> > There are many issues with using the extended PCI configuration
> > space (CPU, Chipset and most of all BIOS bugs). This while the vast
> > majority of drivers and devices don't even use/need to use the
> > memory mapped access methods since they don't use the config space
> > beyond the traditional 256 bytes.
> > 
> > This patch makes accessing the extended config space a driver
> > choice, via the
> > 
> > pci_enable_ext_config(pdev)
> 
> Yuck.  And, Linus is just being silly.  Wait a year then turn on 
> MMCONFIG :)  It took PCI MSI a while to mature, but is finally
> getting there.
> 

Do you hate the name or the concept? I'm certainly open for a better name.... 
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