linux-kernel - Re: [PATCH-WIP 07/13] xen/arm: receive xen events on arm

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Date:	Fri, 24 Feb 2012 11:12:45 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	Ian Campbell <Ian.Campbell@...rix.com>
Subject: Re: [PATCH-WIP 07/13] xen/arm: receive xen events on arm

On 23/02/12 17:48, Stefano Stabellini wrote:
> Compile events.c and use IRQ 32 to receive events notifications.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>

> +#ifdef CONFIG_ARM
> +#define IRQ_EVTCHN_CALLBACK 63
> +irqreturn_t xen_arm_callback(int irq, void *arg)
> +{
> +	__xen_evtchn_do_upcall();
> +	return 0;
> +}
> +
> +int __init xen_init_IRQ_arm(void)
> +{
> +	int rc;
> +	xen_init_IRQ();
> +	rc = request_irq(IRQ_EVTCHN_CALLBACK, xen_arm_callback,
> +			IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
> +			"events", "events");	
> +	if (rc) {
> +		printk(KERN_ERR "Error requesting IRQ %d\n", IRQ_EVTCHN_CALLBACK);
> +	}
> +	return rc;
> +}
> +core_initcall(xen_init_IRQ_arm);
> +#endif

You should (eventually) have a device tree binding for the event channel
and use a OF (device tree) device driver instead of this core_initcall()
to register the handler etc.

David

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