From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: [PATCH v3 4/5] xen: arm: map child MMIO and IRQs to
 dom0 for PCI bus DT nodes.
Date: Fri, 8 May 2015 11:58:10 +0100
Message-ID: <1431082690.2660.432.camel@citrix.com>
References: <1429532129.25195.422.camel@citrix.com>
	<1429532165-19069-4-git-send-email-ian.campbell@citrix.com>
	<5541055B.30608@citrix.com> <1431081772.2660.429.camel@citrix.com>
	<554C957C.8090200@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <554C957C.8090200@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Julien Grall <julien.grall@citrix.com>
Cc: vijay.kilari@gmail.com, stefano.stabellini@eu.citrix.com, julien.grall@linaro.org, tim@xen.org, xen-devel@lists.xen.org, Chen Baozi <cbz@baozis.org>, Suravee Suthikulanit <suravee.suthikulpanit@amd.com>
List-Id: xen-devel@lists.xenproject.org

On Fri, 2015-05-08 at 11:52 +0100, Julien Grall wrote:
> Hi Ian,
> 
> On 08/05/15 11:42, Ian Campbell wrote:
> > On Wed, 2015-04-29 at 17:22 +0100, Julien Grall wrote:
> >> Hi Ian,
> >>
> >> On 20/04/15 13:16, Ian Campbell wrote:
> >>> +static int map_interrupt_to_domain(const struct dt_device_node *dev,
> >>> +                                   const struct dt_raw_irq *dt_raw_irq,
> >>> +                                   void *data)
> >>> +{
> >>
> >> [..]
> >>
> >>> +    res = route_irq_to_guest(d, dt_irq.irq, dt_irq.irq, dt_node_name(dev));
> >>> +    if ( res < 0 )
> >>> +    {
> >>> +        printk(XENLOG_ERR "Unable to map IRQ%"PRId32" to dom%d\n",
> >>> +               dt_irq.irq, d->domain_id);
> >>> +        return res;
> >>> +    }
> >>
> >> You forgot to give the IRQ permission to the domain.
> > 
> > IOW I should call irq_permit_access, between irq_set_spi_type and
> > route_irq_to_guest I think?
> 
> I can call here. Although it doesn't matter has irq_permit_access is not
> used in route_irq_to_guest.
> 
> > Should I be calling vgic_reserve_virq here as well? Other similar
> > looking code does.
> 
> Yes I forgot to tell you about it.
> 
> > It seems that handle_device() calls vgic_reserve_virq twice with the
> > same arguments (once conditionally, the other not). Is that a rebase-o?
> > Seems to have happened in cb818a58f6f785bb41a35bc1d1e52c66ffbe1e8b.
> 
> Hmmm... yes. I didn't pay enough attention when I rebased this patch, sorry.
> 
> The first call to vgic_reserve_virq should be dropped. It's only
> necessary to reserve the VIRQ when the domain is using the IRQ (i.e
> need_mapping == 1).
> 
> Do you plan to send a patch for it?

Yes, I'll tack it on the front of this series.

Ian.