linux-kernel - Re: Multiple MSI, take 3

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Message-ID: <m1iqvc7iys.fsf@frodo.ebiederm.org>
Date:	Fri, 11 Jul 2008 04:34:19 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	grundler@...isc-linux.org, mingo@...e.hu, tglx@...utronix.de,
	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	suresh.b.siddha@...el.com, benh@...nel.crashing.org,
	jbarnes@...tuousgeek.org, rdunlap@...otime.net,
	mtk.manpages@...il.com
Subject: Re: Multiple MSI, take 3

There is one idea that seems to model this cleanly
without breaking all kinds of expectations.

That is an irq with a very small data payload.

In that case we wire all of the vectors up to a single
irq handler that computes the payload as:
payload = vector - base-vector.

And then we figure out how to pass that to the handler in irqaction.

To most of the system it is a single irq so it avoids breaking
expectations about what an irq is.

To everything else it is a little odd, and has it's own unique
set of rules (which is good as well).

Eric
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