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Re: [RFC PATCH v1] irqchip: add support for SMP irq router

From Jason Cooper <jason@lakedaemon.net>
Newsgroups linux.kernel
Subject Re: [RFC PATCH v1] irqchip: add support for SMP irq router
Date 2016-07-06 18:50 +0200
Message-ID <rRYbo-39I-17@gated-at.bofh.it> (permalink)
References (5 earlier) <rRBRv-5oU-3@gated-at.bofh.it> <rRCaR-5LK-3@gated-at.bofh.it> <rREcF-73g-3@gated-at.bofh.it> <rRQQy-6Wm-37@gated-at.bofh.it> <rRRtf-7s1-23@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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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Thread

[RFC PATCH v1] irqchip: add support for SMP irq router Sebastian Frias <sf84@laposte.net> - 2016-06-30 18:20 +0200
  Re: [RFC PATCH v1] irqchip: add support for SMP irq router Mason <slash.tmp@free.fr> - 2016-07-04 14:20 +0200
    Re: [RFC PATCH v1] irqchip: add support for SMP irq router Sebastian Frias <sf84@laposte.net> - 2016-07-05 14:40 +0200
      Re: [RFC PATCH v1] irqchip: add support for SMP irq router Jason Cooper <jason@lakedaemon.net> - 2016-07-05 16:50 +0200
        Re: [RFC PATCH v1] irqchip: add support for SMP irq router Mason <slash.tmp@free.fr> - 2016-07-05 17:10 +0200
          Re: [RFC PATCH v1] irqchip: add support for SMP irq router Jason Cooper <jason@lakedaemon.net> - 2016-07-05 18:20 +0200
            Re: [RFC PATCH v1] irqchip: add support for SMP irq router Sebastian Frias <sf84@laposte.net> - 2016-07-06 13:40 +0200
              Re: [RFC PATCH v1] irqchip: add support for SMP irq router Jason Cooper <jason@lakedaemon.net> - 2016-07-06 18:30 +0200
        Re: [RFC PATCH v1] irqchip: add support for SMP irq router Sebastian Frias <sf84@laposte.net> - 2016-07-05 17:20 +0200
          Re: [RFC PATCH v1] irqchip: add support for SMP irq router Jason Cooper <jason@lakedaemon.net> - 2016-07-05 18:00 +0200
            Re: [RFC PATCH v1] irqchip: add support for SMP irq router Sebastian Frias <sf84@laposte.net> - 2016-07-05 18:40 +0200
              Re: [RFC PATCH v1] irqchip: add support for SMP irq router Marc Zyngier <marc.zyngier@arm.com> - 2016-07-05 18:50 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Sebastian Frias <sf84@laposte.net> - 2016-07-05 19:00 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Marc Zyngier <marc.zyngier@arm.com> - 2016-07-05 19:20 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Thomas Gleixner <tglx@linutronix.de> - 2016-07-05 21:30 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Marc Zyngier <marc.zyngier@arm.com> - 2016-07-06 11:00 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Thomas Gleixner <tglx@linutronix.de> - 2016-07-06 11:40 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Sebastian Frias <sf84@laposte.net> - 2016-07-06 12:50 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Marc Zyngier <marc.zyngier@arm.com> - 2016-07-06 16:00 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Jason Cooper <jason@lakedaemon.net> - 2016-07-06 18:50 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Sebastian Frias <sf84@laposte.net> - 2016-07-06 12:50 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Marc Zyngier <marc.zyngier@arm.com> - 2016-07-06 16:00 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Sebastian Frias <sf84@laposte.net> - 2016-07-07 14:20 +0200
                Re: [RFC PATCH v1] irqchip: add support for SMP irq router Marc Zyngier <marc.zyngier@arm.com> - 2016-07-07 14:50 +0200

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