linux-kernel - Re: [PATCH 0/5][RFC] Physical PCI slot objects

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Date:	Wed, 14 Nov 2007 18:03:56 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Greg KH <greg@...ah.com>
Cc:	Alex Chiang <achiang@...com>, gregkh@...e.de,
	kristen.c.accardi@...el.com, lenb@...nel.org, matthew@....cx,
	rick.jones2@...com, linux-kernel@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz,
	pcihpd-discuss@...ts.sourceforge.net, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 0/5][RFC] Physical PCI slot objects

On Wed, Nov 14, 2007 at 09:51:51AM -0800, Greg KH wrote:
> On Wed, Nov 14, 2007 at 05:44:01PM +0000, Matthew Garrett wrote:
> > Dumping raw ACPI tables isn't adequate - _SUN might be a complex ACPI 
> > method with multiple reads and writes to raw hardware, and we really 
> > don't want to do that in userspace. The only way to do this reliably is 
> > in the kernel.
> 
> But it really isn't, as the firmware kit has proven...

The firmware toolkit will only work if the _SUN method merely returns a 
hardcoded value. The spec doesn't require that that be the case, and 
it's easy to imagine situations where it won't.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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