linux-kernel - Re: [PATCH v2 1/3] irqchip/sifive-plic: Set default irq affinity in plic_irqdomain

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Date:   Fri, 22 May 2020 12:14:00 +0530
From:   Anup Patel <anup@...infault.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Anup Patel <Anup.Patel@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Atish Patra <Atish.Patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 1/3] irqchip/sifive-plic: Set default irq affinity in plic_irqdomain_map()

On Fri, May 22, 2020 at 3:36 AM Palmer Dabbelt <palmer@...belt.com> wrote:
>
> On Mon, 18 May 2020 02:14:39 PDT (-0700), Anup Patel wrote:
> > For multiple PLIC instances, each PLIC can only target a subset of
> > CPUs which is represented by "lmask" in the "struct plic_priv".
> >
> > Currently, the default irq affinity for each PLIC interrupt is all
> > online CPUs which is illegal value for default irq affinity when we
> > have multiple PLIC instances. To fix this, we now set "lmask" as the
> > default irq affinity in for each interrupt in plic_irqdomain_map().
> >
> > Fixes: f1ad1133b18f ("irqchip/sifive-plic: Add support for multiple PLICs")
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Anup Patel <anup.patel@....com>
> > ---
> >  drivers/irqchip/irq-sifive-plic.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
> > index 822e074c0600..9f7f8ce88c00 100644
> > --- a/drivers/irqchip/irq-sifive-plic.c
> > +++ b/drivers/irqchip/irq-sifive-plic.c
> > @@ -176,9 +176,12 @@ static struct irq_chip plic_chip = {
> >  static int plic_irqdomain_map(struct irq_domain *d, unsigned int irq,
> >                             irq_hw_number_t hwirq)
> >  {
> > +     struct plic_priv *priv = d->host_data;
> > +
> >       irq_domain_set_info(d, irq, hwirq, &plic_chip, d->host_data,
> >                           handle_fasteoi_irq, NULL, NULL);
>
> If you're going to re-spin this, d->host_data could be priv here.

The controller's private data is named "host_data" for "struct irq_domain"
in Linux irq subsystem hence the usage.

>
> >       irq_set_noprobe(irq);
> > +     irq_set_affinity(irq, &priv->lmask);
> >       return 0;
> >  }
>
> Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
> Acked-by: Palmer Dabbelt <palmerdabbelt@...gle.com>

Thanks,
Anup