linux-kernel - Re: [PATCH HACK] powerpc: quick hack to get a functional eHEA with hardirq preemption

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Message-ID: <20080925094231.442a4c75@bull.net>
Date:	Thu, 25 Sep 2008 09:42:31 +0200
From:	Sebastien Dugue <sebastien.dugue@...l.net>
To:	benh@...nel.crashing.org
Cc:	Milton Miller <miltonm@....com>,
	Jan-Bernd Themann <ossthema@...ibm.com>,
	Christoph Raisch <RAISCH@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH HACK] powerpc: quick hack to get a functional eHEA with
 hardirq preemption

On Thu, 25 Sep 2008 17:22:41 +1000 Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:

> On Thu, 2008-09-25 at 09:18 +0200, Sebastien Dugue wrote:
> > 
> > > Ok, that's the right approach then. It should work. I don't know
> > what
> > > the specific problems with HEA are at this stage.
> > 
> >   Yep, except as it behaves in way that the current -rt fasteoi flow
> > cannot handle.
> 
> We probably need to make a special xics flow handler for -rt that does
> what Milton suggested, ie, bring down the CPU priority right away

  Do you mean creating a custom fasteoi handler into xics.c? Also, it's
not clear to me from looking at the code how you go about changing the
cpu priority.

> and
> only EOI later or something like that, instead of masking/unmasking.
> 
> I don't know what are the other potential issues with the HEA though.

  Don't know either, but that I can test.

  Thanks,

  Sebastien.
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