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Message-ID: <20160706164904.GK3348@io.lakedaemon.net>
Date: Wed, 6 Jul 2016 16:49:04 +0000
From: Jason Cooper <jason@...edaemon.net>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Marc Zyngier <marc.zyngier@....com>,
Sebastian Frias <sf84@...oste.net>, Mason <slash.tmp@...e.fr>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v1] irqchip: add support for SMP irq router
On Wed, Jul 06, 2016 at 11:30:48AM +0200, Thomas Gleixner wrote:
> On Wed, 6 Jul 2016, Marc Zyngier wrote:
> > On 05/07/16 20:24, Thomas Gleixner wrote:
> > > On Tue, 5 Jul 2016, Marc Zyngier wrote:
> > >> Hardcoded? No way. You simply implement a route allocator in your
> > >> driver, assigning them as needed. And yes, if you have more than 24
> > >> interrupts, they get muxed.
> > >
> > > There is one caveat though. Under some circumstances (think RT) you want to
> > > configure which interrupts get muxed and which not. We really should have that
> > > option, but yes for anything which has less than 24 autorouting is the way to
> > > go.
> >
> > Good point. I can see two possibilities for that:
> >
> > - either we describe this DT with some form of hint, indicating what are
> > the inputs that can be muxed to a single output. Easy, but the DT guys
> > are going to throw rocks at me for being Linux-specific.
>
> That's not necessarily Linux specific. The problem arises with any other OS as
> well.
I could see a property
irq,no-mux = <3 7 13 19 23 ...>;
Or "irq,fastpath". It's describing an optimal configuration of the
system. $driver for $OS can route those first individually. The others
would be eligible for muxing.
thx,
Jason.
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