From mboxrd@z Thu Jan  1 00:00:00 1970
From: david.vrabel@citrix.com (David Vrabel)
Date: Fri, 24 Feb 2012 11:12:45 +0000
Subject: [PATCH-WIP 07/13] xen/arm: receive xen events on arm
In-Reply-To: <1330019314-20865-7-git-send-email-stefano.stabellini@eu.citrix.com>
References: <alpine.DEB.2.00.1202231714590.23091@kaball-desktop>
 <1330019314-20865-7-git-send-email-stefano.stabellini@eu.citrix.com>
Message-ID: <4F4770AD.6040703@citrix.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

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@eu.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