From: Anup Patel <anup@brainfault.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
Jason Cooper <jason@lakedaemon.net>,
Marc Zyngier <marc.zyngier@arm.com>,
Palmer Dabbelt <palmer@sifive.com>,
"linux-kernel@vger.kernel.org List"
<linux-kernel@vger.kernel.org>, Atish Patra <atish.patra@wdc.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Thomas Gleixner <tglx@linutronix.de>,
linux-riscv@lists.infradead.org
Subject: Re: [PATCH v3 4/6] irqchip: sifive-plic: Add warning in plic_init() if handler already present
Date: Tue, 18 Dec 2018 14:06:29 +0530 [thread overview]
Message-ID: <CAAhSdy05S1SSOC3e1r9ULrjFyGEquR50TKqvKQN8OFxVdgEdtg@mail.gmail.com> (raw)
In-Reply-To: <20181217182812.GD7086@infradead.org>
On Mon, Dec 17, 2018 at 11:58 PM Christoph Hellwig <hch@infradead.org> wrote:
>
> On Fri, Nov 30, 2018 at 01:32:05PM +0530, Anup Patel wrote:
> > We have two enteries (one for M-mode and another for S-mode) in the
> > interrupts-extended DT property of PLIC DT node for each HART. It is
> > expected that firmware/bootloader will set M-mode HWIRQ line of each
> > HART to 0xffffffff (i.e. -1) in interrupts-extended DT property
> > because Linux runs in S-mode only.
> >
> > If firmware/bootloader is buggy then it will not correctly update
> > interrupts-extended DT property which might result in a plic_handler
> > configured twice. This patch adds a warning in plic_init() if a
> > plic_handler is already marked present. This warning provides us
> > a hint about incorrectly updated interrupts-extended DT property.
> >
> > Signed-off-by: Anup Patel <anup@brainfault.org>
> > ---
> > drivers/irqchip/irq-sifive-plic.c | 5 +++++
> > 1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
> > index d4433399eb89..3d4f205f8abe 100644
> > --- a/drivers/irqchip/irq-sifive-plic.c
> > +++ b/drivers/irqchip/irq-sifive-plic.c
> > @@ -234,6 +234,11 @@ static int __init plic_init(struct device_node *node,
> >
> > cpu = riscv_hartid_to_cpuid(hartid);
> > handler = per_cpu_ptr(&plic_handlers, cpu);
> > + if (handler->present) {
> > + pr_warn("handler not available for context %d.\n", i);
> > + continue;
> > + }
>
> Shouldn't this be something like "handler already present.."
OK, I will re-phrase it.
>
> Otherwise this looks fine:
>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
Regards,
Anup
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next prev parent reply other threads:[~2018-12-18 8:37 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-30 8:02 [PATCH v3 0/6] IRQ affinity support in PLIC driver Anup Patel
2018-11-30 8:02 ` [PATCH v3 1/6] irqchip: sifive-plic: Pre-compute context hart base and enable base Anup Patel
2018-12-17 18:25 ` Christoph Hellwig
2018-12-18 8:30 ` Anup Patel
2018-11-30 8:02 ` [PATCH v3 2/6] irqchip: sifive-plic: Add struct plic_hw for global PLIC HW details Anup Patel
2018-12-17 18:24 ` Christoph Hellwig
2018-12-18 8:25 ` Anup Patel
2018-11-30 8:02 ` [PATCH v3 3/6] irqchip: sifive-plic: More flexible plic_irq_toggle() Anup Patel
2018-12-17 18:27 ` Christoph Hellwig
2018-12-18 8:50 ` Anup Patel
2018-12-19 16:28 ` Christoph Hellwig
2018-12-27 5:27 ` Anup Patel
2018-11-30 8:02 ` [PATCH v3 4/6] irqchip: sifive-plic: Add warning in plic_init() if handler already present Anup Patel
2018-12-17 18:28 ` Christoph Hellwig
2018-12-18 8:36 ` Anup Patel [this message]
2018-11-30 8:02 ` [PATCH v3 5/6] irqchip: sifive-plic: Differentiate between PLIC handler and context Anup Patel
2018-11-30 8:02 ` [PATCH v3 6/6] irqchip: sifive-plic: Implement irq_set_affinity() for SMP host Anup Patel
2018-12-17 18:32 ` Christoph Hellwig
2018-12-18 10:32 ` Anup Patel
2018-12-17 9:37 ` [PATCH v3 0/6] IRQ affinity support in PLIC driver Anup Patel
2018-12-20 20:40 ` Palmer Dabbelt
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