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

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Message-ID:  <mj+md-20071223.101546.31941.nikam@ucw.cz>
Date:	Sun, 23 Dec 2007 11:18:02 +0100
From:	Martin Mares <mj@....cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jeff Garzik <jeff@...zik.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, gregkh@...e.de,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [patch] Make MMCONFIG space (extended PCI config space) a driver opt-in issue

Hi!

> The fact is, 99% of the hardware you buy *today* has absolutely zero need 
> for extended PCI config access. In fact, I would not be surprised at all 
> if most hardware sold today generally doesn't have *any* devices that even 
> have config registers in the 0x100+ range.

Most PCI Express bridges have root complex control block capabilities
which have to reside in the extended range.

However I agree that hardware _requiring_ extended config register access
is rare.

				Have a nice fortnight
-- 
Martin `MJ' Mares                          <mj@....cz>   http://mj.ucw.cz/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
"Dijkstra probably hates me." -- /usr/src/linux/kernel/sched.c
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