Re: [Qemu-devel] ioh3420: Add a map_irq function

[Alex Williamson <alex.williamson@redhat.com>]

On Fri, 2013-09-27 at 15:10 -0700, Alexander Duyck wrote:
> On 02/28/2013 10:49 AM, Alex Williamson wrote:
> > Every bridge needs to know how to map IRQs from it's secondary bus to
> > the primary bus.  We seem to be direct mapped on ioh3420.  This avoids
> > segfaults when trying to put assigned devices behind root ports.
> > 
> > Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> > 
> > ---
> > hw/ioh3420.c |    7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/hw/ioh3420.c b/hw/ioh3420.c
> > index 95bceb5..6ac4fe7 100644
> > --- a/hw/ioh3420.c
> > +++ b/hw/ioh3420.c
> > @@ -90,6 +90,11 @@ static void ioh3420_reset(DeviceState *qdev)
> >      pci_bridge_disable_base_limit(d);
> >  }
> >  
> > +static int ioh3420_map_irq(PCIDevice *pci_dev, int irq_num)
> > +{
> > +    return irq_num;
> > +}
> > +
> >  static int ioh3420_initfn(PCIDevice *d)
> >  {
> >      PCIBridge* br = DO_UPCAST(PCIBridge, dev, d);
> > @@ -97,6 +102,8 @@ static int ioh3420_initfn(PCIDevice *d)
> >      PCIESlot *s = DO_UPCAST(PCIESlot, port, p);
> >      int rc;
> >  
> > +    pci_bridge_map_irq(br, NULL, ioh3420_map_irq);
> > +
> >      rc = pci_bridge_initfn(d);
> >      if (rc < 0) {
> >          return rc;
> > 
> 
> What became of this patch?  I believe I am seeing the issue described
> when I assign a MSI-X capable virtual device to the secondary bus of an
> ioh3420, and applying this patch seems to resolve the issue.  Was there
> an alternate patch proposed and if so where can I find it?

Hmm, I thought it was no longer necessary with
pci_device_route_intx_to_irq(), especially if you're assigning a VF that
doesn't support INTx.  Are you using the latest qemu bits?  pci-assign
or vfio-pci?  Maybe provide a backtrace?  Thanks,

Alex