linux-kernel - Re: [patch 03/32] genirq: Provide generic hwirq allocation facility

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Date:	Tue, 13 May 2014 18:59:44 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Chris Metcalf <cmetcalf@...era.com>
cc:	LKML <linux-kernel@...r.kernel.org>, Tony Lu <zlu@...era.com>,
	Ingo Molnar <mingo@...e.hu>, Peter Anvin <hpa@...or.com>,
	Tony Luck <tony.luck@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [patch 03/32] genirq: Provide generic hwirq allocation
 facility

Chris,

On Thu, 8 May 2014, Thomas Gleixner wrote:
> On Thu, 8 May 2014, Thomas Gleixner wrote:
> > Now on top of that we need irq domain support for this kind of matrix
> > mappings down to the vector level and everything else falls in
> > place. I have not thought through the irq domain angle, but maybe
> > Grant/Ben can give some input on that.
> 
> Just talked to Grant to get my irqdomain foo up to speed.
> 
> irq domains support parent irq domains already, which allow you to
> request an irq from the parent.
> 
> What's missing is:
> 
> - a bitmap based matrix vector allocator, but that shouldn't be rocket
>   science to write one.
> 
> - a mechanism to hand a cpumask down in the allocation chain
> 
> - a shortcut support to avoid multi level map lookups for the fast
>   path.
> 
> Once we have that everything just falls in place and when tile and x86
> are switched over we can rip out the LEGACY allocator again. That'll
> leave itanic with its homebrewn create_irq machinery, but I'm happy to
> ignore that as this is almost completely confined in ia64 code where
> is can bitrot happily until it sinks.

any comment on this ?

Thanks,

	tglx
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