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From: Atish Patra <atishp@atishpatra.org>
To: Greentime Hu <greentime.hu@sifive.com>
Cc: Jason Cooper <jason@lakedaemon.net>,
	Marc Zyngier <maz@kernel.org>,
	"linux-kernel@vger.kernel.org List"
	<linux-kernel@vger.kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-riscv <linux-riscv@lists.infradead.org>
Subject: Re: [PATCH 1/2] irqchip/sifive-plic: Enable or disable interrupt based on its previous setting
Date: Mon, 12 Oct 2020 18:31:43 -0700
Message-ID: <CAOnJCULYeoBGOBwbBo3izZsQpkgFvPotaH+FJ+5M2SWG=m=ypA@mail.gmail.com> (raw)
In-Reply-To: <20201012135724.110579-1-greentime.hu@sifive.com>

On Mon, Oct 12, 2020 at 6:57 AM Greentime Hu <greentime.hu@sifive.com> wrote:
>
> It will always enable the interrupt after calling plic_set_affinity()
> however it should set to its previous setting. Staying disabled or enabled.
>
> This patch can also fix this pwm hang issue in Unleashed board.
>
> [  919.015783] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
> [  919.020922] rcu:     0-...0: (0 ticks this GP)
> idle=7d2/1/0x4000000000000002 softirq=1424/1424 fqs=105807
> [  919.030295]  (detected by 1, t=225825 jiffies, g=1561, q=3496)
> [  919.036109] Task dump for CPU 0:
> [  919.039321] kworker/0:1     R  running task        0    30      2 0x00000008
> [  919.046359] Workqueue: events set_brightness_delayed
> [  919.051302] Call Trace:
> [  919.053738] [<ffffffe000930d92>] __schedule+0x194/0x4de
> [  982.035783] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
> [  982.040923] rcu:     0-...0: (0 ticks this GP)
> idle=7d2/1/0x4000000000000002 softirq=1424/1424 fqs=113325
> [  982.050294]  (detected by 1, t=241580 jiffies, g=1561, q=3509)
> [  982.056108] Task dump for CPU 0:
> [  982.059321] kworker/0:1     R  running task        0    30      2 0x00000008
> [  982.066359] Workqueue: events set_brightness_delayed
> [  982.071302] Call Trace:
> [  982.073739] [<ffffffe000930d92>] __schedule+0x194/0x4de
> [..]
>
> Fixes: bb0fed1c60cc ("irqchip/sifive-plic: Switch to fasteoi flow")
> Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
> ---
>  drivers/irqchip/irq-sifive-plic.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
> index eaa3e9fe54e9..4cc8a2657a6d 100644
> --- a/drivers/irqchip/irq-sifive-plic.c
> +++ b/drivers/irqchip/irq-sifive-plic.c
> @@ -137,6 +137,7 @@ static int plic_set_affinity(struct irq_data *d,
>                              const struct cpumask *mask_val, bool force)
>  {
>         unsigned int cpu;
> +       bool enable;
>         struct cpumask amask;
>         struct plic_priv *priv = irq_get_chip_data(d->irq);
>
> @@ -150,8 +151,10 @@ static int plic_set_affinity(struct irq_data *d,
>         if (cpu >= nr_cpu_ids)
>                 return -EINVAL;
>
> +       enable = !irqd_irq_disabled(d);
>         plic_irq_toggle(&priv->lmask, d, 0);
> -       plic_irq_toggle(cpumask_of(cpu), d, 1);
> +       /* Keep its original setting. */
> +       plic_irq_toggle(cpumask_of(cpu), d, enable);
>
>         irq_data_update_effective_affinity(d, cpumask_of(cpu));
>
> --
> 2.28.0
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

LGTM.

Reviewed-by: Atish Patra <atish.patra@wdc.com>

-- 
Regards,
Atish

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      parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-12 13:57 Greentime Hu
2020-10-12 13:57 ` [PATCH 2/2] irqchip/sifive-plic: Fix the interrupt was enabled accidentally issue Greentime Hu
2020-10-15 21:23   ` Marc Zyngier
2020-10-16 13:42     ` Thomas Gleixner
2020-10-12 17:02 ` [PATCH 1/2] irqchip/sifive-plic: Enable or disable interrupt based on its previous setting Anup Patel
2020-10-13  1:31 ` Atish Patra [this message]

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