linux-kernel - RE: [PATCH 2/4] irqchip/sifive-plic: Improve boot prints for multiple PLIC instances

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Date:   Sat, 16 May 2020 12:53:03 +0000
From:   Anup Patel <Anup.Patel@....com>
To:     Marc Zyngier <maz@...nel.org>
CC:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Atish Patra <Atish.Patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Anup Patel <anup@...infault.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/4] irqchip/sifive-plic: Improve boot prints for multiple
 PLIC instances



> -----Original Message-----
> From: Marc Zyngier <maz@...nel.org>
> Sent: 16 May 2020 17:50
> To: Anup Patel <Anup.Patel@....com>
> Cc: Palmer Dabbelt <palmer@...belt.com>; Paul Walmsley
> <paul.walmsley@...ive.com>; Thomas Gleixner <tglx@...utronix.de>; Jason
> Cooper <jason@...edaemon.net>; Atish Patra <Atish.Patra@....com>; Alistair
> Francis <Alistair.Francis@....com>; Anup Patel <anup@...infault.org>; linux-
> riscv@...ts.infradead.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 2/4] irqchip/sifive-plic: Improve boot prints for multiple
> PLIC instances
> 
> On 2020-05-16 07:38, Anup Patel wrote:
> > We improve PLIC banner to help distinguish multiple PLIC instances in
> > boot time prints.
> >
> > Signed-off-by: Anup Patel <anup.patel@....com>
> > ---
> >  drivers/irqchip/irq-sifive-plic.c | 11 +++++++++--
> >  1 file changed, 9 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/irqchip/irq-sifive-plic.c
> > b/drivers/irqchip/irq-sifive-plic.c
> > index 7dc23edb3267..2d3db927a551 100644
> > --- a/drivers/irqchip/irq-sifive-plic.c
> > +++ b/drivers/irqchip/irq-sifive-plic.c
> > @@ -284,6 +284,11 @@ static int __init plic_init(struct device_node
> > *node,
> >  	u32 nr_irqs;
> >  	struct plic_priv *priv;
> >  	struct plic_handler *handler;
> > +	struct resource iores;
> > +
> > +	error = of_address_to_resource(node, 0, &iores);
> > +	if (error)
> > +		return error;
> >
> >  	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> >  	if (!priv)
> > @@ -377,8 +382,10 @@ static int __init plic_init(struct device_node
> > *node,
> >  		plic_cpuhp_setup_done = true;
> >  	}
> >
> > -	pr_info("mapped %d interrupts with %d handlers for %d contexts.\n",
> > -		nr_irqs, nr_handlers, nr_contexts);
> > +	pr_info("interrupt-controller at 0x%llx "
> > +		"(interrupts=%d, contexts=%d, handlers=%d)\n",
> > +		(unsigned long long)iores.start, nr_irqs,
> > +		nr_contexts, nr_handlers);
> 
> Instead of displaying "interrupt controller at ...", why not use the existing printk
> format for OF nodes? Something along the lines of
> 
>      pr_info("%pOF : mapped %d interrupts with %d handlers for %d contexts\n",
>              node, nr_irqs, nr_handlers, nr_contexts);

Sure, I will go with your suggestion and use printk for OF nodes.

Regards,
Anup