linux-kernel - Re: [RFC PATCH v1 2/4] irqchip: GICv3: set non-percpu irqs status with _IRQ_MOVE

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Date:	Sun, 6 Sep 2015 13:56:43 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Yang Yingliang <yangyingliang@...wei.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <marc.zyngier@....com>,
	Mark Rutland <mark.rutland@....com>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Hanjun Guo <hanjun.guo@...aro.org>
Subject: Re: [RFC PATCH v1 2/4] irqchip: GICv3: set non-percpu irqs status
 with _IRQ_MOVE_PCNTXT

On 2015/9/6 12:23, Yang Yingliang wrote:
> Use irq_settings_set_move_pcntxt() helper irqs status with
> _IRQ_MOVE_PCNTXT. So that it can do set affinity when calling
> irq_set_affinity_locked().
Hi Yingliang,
	We could only set _IRQ_MOVE_PCNTCT flag to enable migrating
IRQ in process context if your hardware platform supports atomically
change IRQ configuration. Not sure whether that's true for GICv3.
If GICv3 doesn't support atomically change irq configuration, this
change may cause trouble.
Thanks!
Gerry

> 
> Cc: Jiang Liu <jiang.liu@...ux.intel.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Russell King - ARM Linux <linux@....linux.org.uk>
> Cc: Hanjun Guo <hanjun.guo@...aro.org>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  drivers/irqchip/irq-gic-v3.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
> index e406bc5..9108387 100644
> --- a/drivers/irqchip/irq-gic-v3.c
> +++ b/drivers/irqchip/irq-gic-v3.c
> @@ -688,6 +688,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
>  		irq_domain_set_info(d, irq, hw, &gic_chip, d->host_data,
>  				    handle_fasteoi_irq, NULL, NULL);
>  		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
> +		irq_set_move_pcntxt(irq);
>  	}
>  	/* LPIs */
>  	if (hw >= 8192 && hw < GIC_ID_NR) {
> @@ -696,6 +697,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
>  		irq_domain_set_info(d, irq, hw, &gic_chip, d->host_data,
>  				    handle_fasteoi_irq, NULL, NULL);
>  		set_irq_flags(irq, IRQF_VALID);
> +		irq_set_move_pcntxt(irq);
>  	}
>  
>  	return 0;
> 
--
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