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

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Message-Id: <1180070050.8203.30.camel@concordia.ozlabs.ibm.com>
Date:	Fri, 25 May 2007 15:14:10 +1000
From:	Michael Ellerman <michael@...erman.id.au>
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>,
	Andi Kleen <ak@...e.de>, ninex@...pl,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	David Miller <davem@...emloft.net>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 1/2] msi: Invert the sense of the MSI enables.

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.

cheers

-- 
Michael Ellerman
OzLabs, IBM Australia Development Lab

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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