linux-kernel - Re: pci-disable-decode-of-io-memory-during-bar-sizing.patch

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Date:	Thu, 8 Nov 2007 14:50:42 +0100
From:	Martin Mares <mj@....cz>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Robert Hancock <hancockr@...w.ca>, Greg KH <greg@...ah.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	akpm@...ux-foundation.org, ak@...e.de, rajesh.shah@...el.com,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: pci-disable-decode-of-io-memory-during-bar-sizing.patch

Hello!

> > Maybe we should do all bus scanning with conf1 and then try if
> > MMCONFIG returns the same values?
> 
> that is already in the code today but not nearly enough; there's a ton
> of cases where it's "touch mmconfig and the box is dead"...

Argh.  However I still do not think it is an acceptable reason for breaking
all userspace access to the extended config space.

At the very least, there should be a sysfs toggle to enable MMCONFIG if
root really wishes that (maybe for a particular device, as the drivers
would do).

				Have a nice fortnight
-- 
Martin `MJ' Mares                          <mj@....cz>   http://mj.ucw.cz/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
Do not believe in miracles -- rely on them.
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