Re: [Qemu-devel] [PATCH] xio3130: Add map_irq functions

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Mar 07, 2013 at 12:17:11PM -0700, Alex Williamson wrote:
> On Thu, 2013-03-07 at 20:49 +0200, Michael S. Tsirkin wrote:
> > On Thu, Mar 07, 2013 at 11:29:46AM -0700, Alex Williamson wrote:
> > > Just like root ports, I think these are supposed to be direct mapped.
> > > 
> > > Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> > 
> > Hmm, very strange. Why not using standard pci bridge logic?
> > Any idea?
> 
> Where is it supposed to get set for a bridge?  I see:
> 
> int pci_bridge_initfn(PCIDevice *dev)
> {
> ...
>     sec_bus->map_irq = br->map_irq;
> 
> But nobody is calling pci_bridge_map_irq() to set that, so that's what I
> added.  Thanks,
> 
> Alex

Yes but shouldn't this be using standard PCI mapping,
like pci_bridge_dev_map_irq_fn in pci_bridge_dev?

We really should make it the default if nothing is set ...

> > > ---
> > >  hw/xio3130_downstream.c |    7 +++++++
> > >  hw/xio3130_upstream.c   |    7 +++++++
> > >  2 files changed, 14 insertions(+)
> > > 
> > > diff --git a/hw/xio3130_downstream.c b/hw/xio3130_downstream.c
> > > index 7f00bc8..c484770 100644
> > > --- a/hw/xio3130_downstream.c
> > > +++ b/hw/xio3130_downstream.c
> > > @@ -54,6 +54,11 @@ static void xio3130_downstream_reset(DeviceState *qdev)
> > >      pci_bridge_reset(qdev);
> > >  }
> > >  
> > > +static int xio3130_downstream_map_irq(PCIDevice *pci_dev, int irq_num)
> > > +{
> > > +    return irq_num;
> > > +}
> > > +
> > >  static int xio3130_downstream_initfn(PCIDevice *d)
> > >  {
> > >      PCIBridge* br = DO_UPCAST(PCIBridge, dev, d);
> > > @@ -61,6 +66,8 @@ static int xio3130_downstream_initfn(PCIDevice *d)
> > >      PCIESlot *s = DO_UPCAST(PCIESlot, port, p);
> > >      int rc;
> > >  
> > > +    pci_bridge_map_irq(br, NULL, xio3130_downstream_map_irq);
> > > +
> > >      rc = pci_bridge_initfn(d);
> > >      if (rc < 0) {
> > >          return rc;
> > > diff --git a/hw/xio3130_upstream.c b/hw/xio3130_upstream.c
> > > index 70b15d3..c233a43 100644
> > > --- a/hw/xio3130_upstream.c
> > > +++ b/hw/xio3130_upstream.c
> > > @@ -51,12 +51,19 @@ static void xio3130_upstream_reset(DeviceState *qdev)
> > >      pcie_cap_deverr_reset(d);
> > >  }
> > >  
> > > +static int xio3130_upstream_map_irq(PCIDevice *pci_dev, int irq_num)
> > > +{
> > > +    return irq_num;
> > > +}
> > > +
> > >  static int xio3130_upstream_initfn(PCIDevice *d)
> > >  {
> > >      PCIBridge* br = DO_UPCAST(PCIBridge, dev, d);
> > >      PCIEPort *p = DO_UPCAST(PCIEPort, br, br);
> > >      int rc;
> > >  
> > > +    pci_bridge_map_irq(br, NULL, xio3130_upstream_map_irq);
> > > +
> > >      rc = pci_bridge_initfn(d);
> > >      if (rc < 0) {
> > >          return rc;
> 
>