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

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Message-ID: <20080130201415.GA2473@jurassic.park.msu.ru>
Date:	Wed, 30 Jan 2008 23:14:15 +0300
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Matthew Wilcox <matthew@....cx>, Greg KH <greg@...ah.com>,
	Tony Camuso <tcamuso@...hat.com>,
	Grant Grundler <grundler@...isc-linux.org>,
	Loic Prylli <loic@...i.com>, Adrian Bunk <bunk@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Jeff Garzik <jeff@...zik.org>,
	linux-pci@...ey.karlin.mff.cuni.cz, Martin Mares <mj@....cz>
Subject: Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver
	opt-in

On Wed, Jan 30, 2008 at 07:42:49AM -0800, Arjan van de Ven wrote:
> Xorg doesn't do pci express ..

Xorg core provides a set of PCI config access functions (via sysfs) for
the graphics drivers. These functions do work correctly with offsets > 256
bytes. Can you guarantee that none of PCI-E video drivers use that,
including proprietary nvidia and ati ones?

> (newer ones actually have gotten out of the "do the PCI layer ourselves" business entirely)

Unfortunately, not completely true. Though it has nothing to do with
extended config space.

Ivan.
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