linux-kernel - Re: [PATCH] irqchip: Skip contexts other supervisor in plic

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Date:   Wed, 23 Oct 2019 11:54:54 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Alan Mikhak <alan.mikhak@...ive.com>
cc:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        tglx@...utronix.de, jason@...edaemon.net, maz@...nel.org,
        palmer@...ive.com, hch@...radead.org
Subject: Re: [PATCH] irqchip: Skip contexts other supervisor in plic_init()

+ hch

On Wed, 23 Oct 2019, Alan Mikhak wrote:

> From: Alan Mikhak <alan.mikhak@...ive.com>
> 
> Modify plic_init() to skip .dts interrupt contexts other
> than supervisor external interrupt.

Might be good to explain the motivation here.

> 
> Signed-off-by: Alan Mikhak <alan.mikhak@...ive.com>
> ---
>  drivers/irqchip/irq-sifive-plic.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
> index c72c036aea76..5f2a773d5669 100644
> --- a/drivers/irqchip/irq-sifive-plic.c
> +++ b/drivers/irqchip/irq-sifive-plic.c
> @@ -251,8 +251,8 @@ static int __init plic_init(struct device_node *node,
>  			continue;
>  		}
>  
> -		/* skip context holes */
> -		if (parent.args[0] == -1)
> +		/* skip contexts other than supervisor external interrupt */
> +		if (parent.args[0] != IRQ_S_EXT)
>  			continue;

Will this need to change for RISC-V M-mode Linux support?  

https://lore.kernel.org/linux-riscv/20191017173743.5430-1-hch@lst.de/


- Paul