linux-kernel - Re: Multiple MSI

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Date:	Tue, 08 Jul 2008 09:06:34 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Grant Grundler <grundler@...isc-linux.org>
Cc:	Matthew Wilcox <matthew@....cx>, linux-pci@...r.kernel.org,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Miller <davem@...emloft.net>,
	Dan Williams <dan.j.williams@...el.com>,
	Martine.Silbermann@...com, linux-kernel@...r.kernel.org,
	Michael Ellerman <michaele@....ibm.com>
Subject: Re: Multiple MSI

On Mon, 2008-07-07 at 10:17 -0600, Grant Grundler wrote:
> The drivers have to deal with the limitations of the HW spec.
> In this case it means they have to know they are getting power of 2
> number of interrupts. I think exposing this in the API is a requirement
> and not optional.

Ugh ?

The number of interrupts isn't what I was talking about, but the
-alignment- was. ie, the driver should make no assumption that the
irq numbers it will obtain will be aligned to a power-of-two.

Cheers,
Ben.


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