Re: [Xen-devel] [PATCH V4 3/4] Introduce XEN scsiback module

[Juergen Gross <jgross@suse.com>]

On 08/12/2014 02:29 PM, Juergen Gross wrote:
> On 08/11/2014 08:14 PM, Christoph Hellwig wrote:
>>> +static void scsiback_notify_work(struct vscsibk_info *info)
>>> +{
>>> +    info->waiting_reqs = 1;
>>> +    wake_up(&info->wq);
>>> +}
>>> +
>>> +static irqreturn_t scsiback_intr(int irq, void *dev_id)
>>> +{
>>> +    scsiback_notify_work((struct vscsibk_info *)dev_id);
>>> +    return IRQ_HANDLED;
>>> +}
>>
>> Seems like this driver should get the same threaded irq treatment as
>> the initiator side?
>
> Indeed.

Turns out to be hard. The interrupt is allocated via
bind_interdomain_evtchn_to_irqhandler() which is not capable of threaded
irq handling. The underlying bind_interdomain_evtchn_to_irq() is not
exported, so I can't use it.

I'll try to change this, but until then I have to leave the irq handling
more or less the same.


Juergen