hw/pci: made pci_bus_is_root a PCIBusClass method

Refactoring it as a method of PCIBusClass will allow
different implementations for subclasses.

Removed the assumption that the root bus does not
have a parent device because is specific only
to the default class implementation.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>

2 files changed, 10 insertions, 0 deletions

diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index 5d050c8..df05c96 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -340,6 +340,8 @@ typedef PCIINTxRoute (*pci_route_irq_fn)(void *opaque, int pin);
 
 #define TYPE_PCI_BUS "PCI"
 #define PCI_BUS(obj) OBJECT_CHECK(PCIBus, (obj), TYPE_PCI_BUS)
+#define PCI_BUS_CLASS(klass) OBJECT_CLASS_CHECK(PCIBusClass, (klass), TYPE_PCI_BUS)
+#define PCI_BUS_GET_CLASS(obj) OBJECT_GET_CLASS(PCIBusClass, (obj), TYPE_PCI_BUS)
 #define TYPE_PCIE_BUS "PCIE"
 
 bool pci_bus_is_express(PCIBus *bus);
diff --git a/include/hw/pci/pci_bus.h b/include/hw/pci/pci_bus.h
index fabaeee..b5ba9c4 100644
--- a/include/hw/pci/pci_bus.h
+++ b/include/hw/pci/pci_bus.h
@@ -8,6 +8,14 @@
  * use accessor functions in pci.h, pci_bridge.h
  */
 
+typedef struct PCIBusClass {
+    /*< private >*/
+    BusClass parent_class;
+    /*< public >*/
+
+    bool (*is_root)(PCIBus *bus);
+} PCIBusClass;
+
 struct PCIBus {
     BusState qbus;
     PCIIOMMUFunc iommu_fn;