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

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Message-ID: <20080113090311.0a9a1db5@laptopd505.fenrus.org>
Date:	Sun, 13 Jan 2008 09:03:11 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	tcamuso@...hat.com
Cc:	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Greg KH <greg@...ah.com>, Matthew Wilcox <matthew@....cx>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>, 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>, Loic Prylli <loic@...i.com>,
	Prarit Bhargava <prarit@...hat.com>,
	"Chumbalkar, Nagananda" <Nagananda.Chumbalkar@...com>,
	"Schoeller, Patrick (Linux - Houston, TX)" <Patrick.Schoeller@...com>,
	Bhavana Nagendra <bnagendr@...hat.com>
Subject: Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver
 opt-in

On Sun, 13 Jan 2008 07:43:11 -0500
Tony Camuso <tcamuso@...hat.com> wrote:

> Arjan van de Ven wrote:
> > On Sat, 12 Jan 2008 20:36:59 -0500
> > Tony Camuso <tcamuso@...hat.com> wrote:
> > 
> >
> > Just about NOBODY has devices that need the extended config space.
> > At all.
> 
> The PCI express spec requires the platform to provide access to this
> space for express-compliance.

PLATFORM not OS :)
Windows isn't using it in the server space, and only in the client space it recently started
considering it.

> More devices will be using this space
> as express becomes the dominant IO bus technology.

sure in like 2009 maybe.


> Which is why Loic's proposal and Ivan's implementation of it is so
> elegant. It solves all these problems in one sweep, and eliminates
> the code rendered cruft by Ivan's patch. A two-fer, by my reckoning.
> 
> >> In other words, for x86, I don't think we need to worry about Port
> >> IO config access ever going away at all.
> > 
> > You're wrong there. Sad to say, but you're wrong there.
> > 
> 
> The PCI spec provides for conf1 as an architected solution. It's not
> going away, and especially not in x86 land where Port IO is built-in
> to the CPU.

again sadly you're wrong. 

-- 
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