Re: [Xen-devel] [PATCH-WIP 07/13] xen/arm: receive xen events on arm

[David Vrabel <david.vrabel@xxxxxxxxxx>]

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@xxxxxxxxxxxxx>

> +#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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