linux-kernel - Re: [PATCH 2/2] msi: Add support for the Intel chipsets that support MSI.

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Date:	Fri, 25 May 2007 07:38:56 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Jay Cliburn <jacliburn@...lsouth.net>,
	Grzegorz Krzystek <ninex@...ex.eu.org>,
	Andrew Morton <akpm@...ux-foundation.org>, ninex@...pl,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	Michael Ellerman <michael@...erman.id.au>,
	David Miller <davem@...emloft.net>,
	Tony Luck <tony.luck@...el.com>, len.brown@...el.com
Subject: Re: [PATCH 2/2] msi:  Add support for the Intel chipsets that support MSI.

On Friday 25 May 2007 06:26:50 Eric W. Biederman wrote:
> 
> This patch is the result of a quick survey of the Intel chipset
> documents.  I took a quick look in the document to see if the chipset
> supported MSI and if so I looked through to find the vendor and device
> id of device 0 function 0 of the chipset and added a quirk for that
> device id if I it was not a duplicate. 

It would be better to look for any PCI bridge. Sometimes there are
different PCI bridges around (e.g. external PCI-X bridges on HT systems) 
which might need own quirks

Also in the x86 world Microsoft defined a FADT ACPI flag that MSI doesn't
work for Vista. It might make sense to do

if (dmi year >= 2007 && FADT.msi_disable not set) assume it works

> This patch should be safe.  The anecdotal evidence is that when dealing
> with MSI the Intel chipsets just work.  If we find some buggy ones
> changing the list won't be hard.

The FADT bit should be probably checked anyways.

-Andi

 
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