linux-kernel - Re: [Fwd: Re: [PATCH 0/5]PCI: x86 MMCONFIG]

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Message-ID: <476ABCBF.8090006@redhat.com>
Date:	Thu, 20 Dec 2007 14:04:31 -0500
From:	Tony Camuso <tcamuso@...hat.com>
To:	Loic Prylli <loic@...i.com>
CC:	Matthew Wilcox <matthew@....cx>, Greg KH <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz
Subject: Re: [Fwd: Re: [PATCH 0/5]PCI: x86 MMCONFIG]

Loic Prylli wrote:

> Always using type 1 for accesses below 256 bytes looks like a very very
> attractive solution
> 
> I know we had a lot of older kernels over the last two years that we
> patched like that (we needed MMCONFIG for our own device development
> purposes, but we also needed our machines to boot and discover all
> devices reliably). Recent kernels works fine out of the box on all
> hardware we have, but all this sometimes tricky and apparently endless
> work (in big part because of buggy BIOSes) about MMCONFIG would probably
> become relatively easy by limiting the aim to have MMCONFIG work when it
> is required (for cfg-space accesses >= 256).
> 
> 
> Loic
> 
Hmmm... I think I like this solution.

It may be easier to implement than the solution I posted.

Also, this solution also would allow us to remove the unreachable_devices()
routine and bitmap.

Does anybody see a down side to this?
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