Re: + msi-refactor-and-move-the-msi-irq_chip-into-the-arch-code.patch added to -mm tree

[David Miller <davem@davemloft.net>]

From: akpm@osdl.org
Date: Wed, 27 Sep 2006 15:15:37 -0700

> Subject: msi: refactor and move the msi irq_chip into the arch code
> From: "Eric W. Biederman" <ebiederm@xmission.com>
> 
> It turns out msi_ops was simply not enough to abstract the architecture
> specific details of msi.  So I have moved the resposibility of constructing
> the struct irq_chip to the architectures, and have two architecture specific
> functions arch_setup_msi_irq, and arch_teardown_msi_irq.
> 
> For simple architectures those functions can do all of the work.  For
> architectures with platform dependencies they can call into the appropriate
> platform code.
> 
> With this msi.c is finally free of assuming you have an apic, and this
> actually takes less code.
> 
> The helpers for the architecture specific code are declared in the linux/msi.h
> to keep them separate from the msi functions used by drivers in linux/pci.h
> 
> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
> Cc: Ingo Molnar <mingo@elte.hu>
> Cc: Tony Luck <tony.luck@intel.com>
> Cc: Andi Kleen <ak@suse.de>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Greg KH <greg@kroah.com>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Signed-off-by: Andrew Morton <akpm@osdl.org>

Eric, thanks so much for doing this work.

Once this goes in I'll try to add support for MSI on sparc64
Niagara boxes.  I suppose the PowerPC folks can make use of
this as well.