pci: Permit incremental conversion of device models to realize

Call the new PCIDeviceClass method realize().  Default it to
pci_default_realize(), which calls old method init().

To convert a device model, make it implement realize() rather than
init().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>

2 files changed, 21 insertions, 6 deletions

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index fe697b1544..b1f3cea9af 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1762,7 +1762,6 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp)
     PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(pci_dev);
     Error *local_err = NULL;
     PCIBus *bus;
-    int rc;
     bool is_default_rom;
 
     /* initialize cap_present for pci_is_express() and pci_config_size() */
@@ -1777,11 +1776,11 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp)
     if (pci_dev == NULL)
         return;
 
-    if (pc->init) {
-        rc = pc->init(pci_dev);
-        if (rc != 0) {
+    if (pc->realize) {
+        pc->realize(pci_dev, &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
             do_pci_unregister_device(pci_dev);
-            error_setg(errp, "Device initialization failed");
             return;
         }
     }
@@ -1801,6 +1800,18 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp)
     }
 }
 
+static void pci_default_realize(PCIDevice *dev, Error **errp)
+{
+    PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
+
+    if (pc->init) {
+        if (pc->init(dev) < 0) {
+            error_setg(errp, "Device initialization failed");
+            return;
+        }
+    }
+}
+
 PCIDevice *pci_create_multifunction(PCIBus *bus, int devfn, bool multifunction,
                                     const char *name)
 {
@@ -2296,10 +2307,13 @@ MemoryRegion *pci_address_space_io(PCIDevice *dev)
 static void pci_device_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *k = DEVICE_CLASS(klass);
+    PCIDeviceClass *pc = PCI_DEVICE_CLASS(klass);
+
     k->realize = pci_qdev_realize;
     k->unrealize = pci_qdev_unrealize;
     k->bus_type = TYPE_PCI_BUS;
     k->props = pci_props;
+    pc->realize = pci_default_realize;
 }
 
 AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index bdee464e61..3164fc3a4f 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -185,7 +185,8 @@ typedef struct PCIINTxRoute {
 typedef struct PCIDeviceClass {
     DeviceClass parent_class;
 
-    int (*init)(PCIDevice *dev);
+    void (*realize)(PCIDevice *dev, Error **errp);
+    int (*init)(PCIDevice *dev);/* TODO convert to realize() and remove */
     PCIUnregisterFunc *exit;
     PCIConfigReadFunc *config_read;
     PCIConfigWriteFunc *config_write;