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From: ebiederm@xmission.com (Eric W. Biederman)
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [RFC/PATCH 4/7] Powerpc MSI implementation
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Date: Tue, 07 Nov 2006 18:33:00 -0700
In-Reply-To: <1162944905.28571.551.camel@localhost.localdomain> (Benjamin
	Herrenschmidt's message of "Wed, 08 Nov 2006 11:15:04 +1100")
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Cc: Matthew Wilcox <matthew@wil.cx>, Greg Kroah-Hartman <greg@kroah.com>,
	Ingo Molnar <mingo@elte.hu>,
	Russell King <rmk-pci@arm.linux.org.uk>, linuxppc-dev@ozlabs.org,
	Thomas Gleixner <tglx@linutronix.de>, linux-pci@atrey.karlin.mff.cuni.cz,
	"David S.Miller" <davem@davemloft.net>
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Benjamin Herrenschmidt <benh@kernel.crashing.org> writes:

>> For message signalled interrupts and hyptertransport interrupts we probably
> want
>> to add an additional field for pointing to their per irq state.  Per device
>> interrupt controllers are truly peculiar.
>
> A per-irq addition field for the MSI data might indeed be useful. I
> still want to store it in the pci_dev, but it would be good to have a
> pointer to it in the irq_desc.

The msi_info in pci_dev is reasonable.  But storing all 4096 possible
msi_desc's in pci_dev seems a little much.

Hopefully I can look at this a little more this evening and see what we
need to do to harmonize the two msi implementations.

Eric