linux-kernel - Re: [PATCH 1/2] msi: Invert the sense of the MSI enables.

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Date:	Thu, 24 May 2007 23:40:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	michael@...erman.id.au
Cc:	ebiederm@...ssion.com, gregkh@...e.de, jacliburn@...lsouth.net,
	ninex@...eX.eu.org, akpm@...ux-foundation.org, ak@...e.de,
	ninex@...pl, linux-kernel@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz, tony.luck@...el.com
Subject: Re: [PATCH 1/2] msi: Invert the sense of the MSI enables.

From: Michael Ellerman <michael@...erman.id.au>
Date: Fri, 25 May 2007 15:14:10 +1000

> On Thu, 2007-05-24 at 22:19 -0600, Eric W. Biederman wrote:
> > Currently we blacklist known bad msi configurations which means we
> > keep getting MSI enabled on chipsets that either do not support MSI,
> > or MSI is implemented improperly.  Since the normal IRQ routing
> > mechanism seems to works even when MSI does not, this is a bad default
> > and causes non-functioning systems for no good reason.
> > 
> > So this patch inverts the sense of the MSI bus flag to only enable
> > MSI on known good systems.  I am seeding that list with the set of
> > chipsets with an enabled hypertransport MSI mapping capability.  Which
> > is as close as I can come to an generic MSI enable.  So for actually
> > using MSI this patch is a regression, but for just having MSI enabled
> > in the kernel by default things should just work with this patch
> > applied.
> 
> I guess this is a good idea for random x86 machines. On powerpc I think
> we'll just turn it on for every bus, and let the existing per-platform
> logic decide.

I think I'll turn it on always on sparc64.
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