Introduce pci_device_init() and use it to initialise an output IRQ.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 hw/pci/pci.c                | 8 ++++++++
 include/hw/pci/pci_device.h | 3 +++
 2 files changed, 11 insertions(+)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 8a87ccc8b0..f29ac20895 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2161,6 +2161,13 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp)
     pci_dev->msi_trigger = pci_msi_trigger;
 }
 
+static void pci_device_init(Object *obj)
+{
+    PCIDevice *pci_dev = PCI_DEVICE(obj);
+
+    qdev_init_gpio_out(DEVICE(obj), &pci_dev->irq, 1);
+}
+
 PCIDevice *pci_new_multifunction(int devfn, bool multifunction,
                                  const char *name)
 {
@@ -2812,6 +2819,7 @@ void pci_set_power(PCIDevice *d, bool state)
 static const TypeInfo pci_device_type_info = {
     .name = TYPE_PCI_DEVICE,
     .parent = TYPE_DEVICE,
+    .instance_init = pci_device_init,
     .instance_size = sizeof(PCIDevice),
     .abstract = true,
     .class_size = sizeof(PCIDeviceClass),
diff --git a/include/hw/pci/pci_device.h b/include/hw/pci/pci_device.h
index d3dd0f64b2..2c6dca5d15 100644
--- a/include/hw/pci/pci_device.h
+++ b/include/hw/pci/pci_device.h
@@ -149,6 +149,9 @@ struct PCIDevice {
     MemoryRegion rom;
     uint32_t rom_bar;
 
+    /* PCI IRQ */
+    qemu_irq irq;
+
     /* INTx routing notifier */
     PCIINTxRoutingNotifier intx_routing_notifier;
 
-- 
2.30.2