linux-kernel - Re: [PATCH v6 3/6] irqchip: gic: Support hierarchy irq domain.

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Message-ID: <54664A32.5070200@arm.com>
Date:	Fri, 14 Nov 2014 18:30:10 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yijing Wang <wangyijing@...wei.com>,
	"srv_heupstream@...iatek.com" <srv_heupstream@...iatek.com>,
	"yingjoe.chen@...il.com" <yingjoe.chen@...il.com>,
	"hc.yen@...iatek.com" <hc.yen@...iatek.com>,
	"eddie.huang@...iatek.com" <eddie.huang@...iatek.com>,
	"nathan.chung@...iatek.com" <nathan.chung@...iatek.com>,
	"yh.chen@...iatek.com" <yh.chen@...iatek.com>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH v6 3/6] irqchip: gic: Support hierarchy irq domain.

On 13/11/14 15:37, Yingjoe Chen wrote:
> Add support to use gic as a parent for stacked irq domain.
> 
> Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
> ---
>  drivers/irqchip/Kconfig   |  1 +
>  drivers/irqchip/irq-gic.c | 80 ++++++++++++++++++++++++++++++++---------------
>  2 files changed, 55 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index b21f12f..7f34138 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -5,6 +5,7 @@ config IRQCHIP
>  config ARM_GIC
>  	bool
>  	select IRQ_DOMAIN
> +	select IRQ_DOMAIN_HIERARCHY
>  	select MULTI_IRQ_HANDLER
>  
>  config GIC_NON_BANKED
> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
> index 38493ff..fe9ab93 100644
> --- a/drivers/irqchip/irq-gic.c
> +++ b/drivers/irqchip/irq-gic.c
> @@ -788,17 +788,16 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
>  {
>  	if (hw < 32) {
>  		irq_set_percpu_devid(irq);
> -		irq_set_chip_and_handler(irq, &gic_chip,
> -					 handle_percpu_devid_irq);
> +		irq_domain_set_info(d, irq, hw, &gic_chip, d->host_data,
> +				    handle_percpu_devid_irq, NULL, NULL);
>  		set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN);
>  	} else {
> -		irq_set_chip_and_handler(irq, &gic_chip,
> -					 handle_fasteoi_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);
>  
>  		gic_routable_irq_domain_ops->map(d, irq, hw);
>  	}
> -	irq_set_chip_data(irq, d->host_data);
>  	return 0;
>  }
>  
> @@ -814,8 +813,6 @@ static int gic_irq_domain_xlate(struct irq_domain *d,
>  {
>  	unsigned long ret = 0;
>  
> -	if (d->of_node != controller)
> -		return -EINVAL;

I'm not sure if removing that check is the right thing to do. You had to
remove it because your sysirq driver passes its own of_phandle_args
directly to the GIC code. I think that's a bad idea, and you should fix
the sysirq layer instead.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...

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