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

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Date:	Thu, 1 Nov 2007 07:08:55 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Martin Mares <mj@....cz>
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

On Thu, 1 Nov 2007 09:31:40 +0100
Martin Mares <mj@....cz> wrote:

> Hello!
> 
> > something like
> > int pci_enable_mmconfig(struct pci_dev *pdev) ?
> > sounds like a very solid plan to me...
> 
> Please remember that the driver is not the sole user of the PCI config
> space -- user-space programs (e.g., lspci) can access it via sysfs,
> too. Should we force users of such programs to add a magic kernel
> parameter to enable MMCONFIG? Does not make much sense.
> 
> 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"...
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