linux-kernel - Re: [PATCH 3/6] irqchip: RISC-V Local Interrupt Controller Driver

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Date:   Thu, 2 Aug 2018 11:44:50 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Christoph Hellwig <hch@....de>
cc:     Marc Zyngier <marc.zyngier@....com>, palmer@...ive.com,
        jason@...edaemon.net, robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, aou@...s.berkeley.edu,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        shorne@...il.com, Palmer Dabbelt <palmer@...belt.com>
Subject: Re: [PATCH 3/6] irqchip: RISC-V Local Interrupt Controller Driver

On Thu, 2 Aug 2018, Christoph Hellwig wrote:
> On Thu, Aug 02, 2018 at 11:35:43AM +0200, Thomas Gleixner wrote:
> > So that's the low level per cpu interrupt/exception distribution mechanism,
> > i.e. a distinct per cpu 'vector' space with fixed functionality. It does
> > not make sense to actually handle that as an irq chip. It has absolutely no
> > relevance. The software interrupts are enabled when the CPU is started and
> > the external ones as well as they are gated by the PLIC.
> > 
> > The only thing which might need to access the enable register is the local
> > timer interrupt. That really does not require an extra irq chip as the
> > enable/disable is really just at cpu up/down time and the magic happens on
> > the local CPU so no smp functional call hackery is required.
> > 
> > The PLIC is the beast which wants a proper irqdomain/irqchip
> > implementation.
> 
> And that is exactly what I've done in the repost.

Ok.

> I need to polish the DT binding a little more and will repost later today.

Lemme go through that reposted series quickly.

Thanks,

	tglx