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

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Message-ID: <20080113173331.617ac935@laptopd505.fenrus.org>
Date:	Sun, 13 Jan 2008 17:33:31 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	tcamuso@...hat.com, 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 Mon, 14 Jan 2008 00:54:34 +0000
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> On Sun, 13 Jan 2008 16:28:08 -0500
> Tony Camuso <tcamuso@...hat.com> wrote:
> 
> > Arjan van de Ven wrote:
> > 
> > >> 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.
>

> 
> I suspect Arjan is wrong. It might be some Intel agenda but I still
> see fairly new driver reference code that is hardcoding port accesses
> even when designed for Redmond products.


I find it hard to believe that even they have their drivers do PCI config access via ports directly from the drivers,
and especially in driver reference code...


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