[PATCH 3/6] hw/isa/piix{3,4}: QOM'ify PCI device creation and wiring

[Bernhard Beschow <shentey@gmail.com>]

PCI interrupt wiring and device creation (piix4 only) were performed
in create() functions which are obsolete. Move these tasks into QOM
functions to modernize the code.

In order to avoid duplicate checking for xen_enabled() the piix3 realize
methods are now split.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
 hw/isa/piix3.c | 67 +++++++++++++++++++++++++++++++++-----------------
 hw/isa/piix4.c | 20 +++++++++------
 2 files changed, 57 insertions(+), 30 deletions(-)

diff --git a/hw/isa/piix3.c b/hw/isa/piix3.c
index 7d69420967..d15117a7c7 100644
--- a/hw/isa/piix3.c
+++ b/hw/isa/piix3.c
@@ -24,6 +24,7 @@
 
 #include "qemu/osdep.h"
 #include "qemu/range.h"
+#include "qapi/error.h"
 #include "hw/southbridge/piix.h"
 #include "hw/irq.h"
 #include "hw/isa/isa.h"
@@ -280,7 +281,7 @@ static const MemoryRegionOps rcr_ops = {
     .endianness = DEVICE_LITTLE_ENDIAN
 };
 
-static void piix3_realize(PCIDevice *dev, Error **errp)
+static void pci_piix3_realize(PCIDevice *dev, Error **errp)
 {
     PIIX3State *d = PIIX3_PCI_DEVICE(dev);
 
@@ -305,7 +306,6 @@ static void pci_piix3_class_init(ObjectClass *klass, void *data)
     dc->desc        = "ISA bridge";
     dc->vmsd        = &vmstate_piix3;
     dc->hotpluggable   = false;
-    k->realize      = piix3_realize;
     k->vendor_id    = PCI_VENDOR_ID_INTEL;
     /* 82371SB PIIX3 PCI-to-ISA bridge (Step A1) */
     k->device_id    = PCI_DEVICE_ID_INTEL_82371SB_0;
@@ -329,11 +329,28 @@ static const TypeInfo piix3_pci_type_info = {
     },
 };
 
+static void piix3_realize(PCIDevice *dev, Error **errp)
+{
+    ERRP_GUARD();
+    PIIX3State *piix3 = PIIX3_PCI_DEVICE(dev);
+    PCIBus *pci_bus = pci_get_bus(dev);
+
+    pci_piix3_realize(dev, errp);
+    if (*errp) {
+        return;
+    }
+
+    pci_bus_irqs(pci_bus, piix3_set_irq, pci_slot_get_pirq,
+                 piix3, PIIX_NUM_PIRQS);
+    pci_bus_set_route_irq_fn(pci_bus, piix3_route_intx_pin_to_irq);
+};
+
 static void piix3_class_init(ObjectClass *klass, void *data)
 {
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
     k->config_write = piix3_write_config;
+    k->realize = piix3_realize;
 }
 
 static const TypeInfo piix3_info = {
@@ -342,11 +359,33 @@ static const TypeInfo piix3_info = {
     .class_init    = piix3_class_init,
 };
 
+static void piix3_xen_realize(PCIDevice *dev, Error **errp)
+{
+    ERRP_GUARD();
+    PIIX3State *piix3 = PIIX3_PCI_DEVICE(dev);
+    PCIBus *pci_bus = pci_get_bus(dev);
+
+    pci_piix3_realize(dev, errp);
+    if (*errp) {
+        return;
+    }
+
+    /*
+     * Xen supports additional interrupt routes from the PCI devices to
+     * the IOAPIC: the four pins of each PCI device on the bus are also
+     * connected to the IOAPIC directly.
+     * These additional routes can be discovered through ACPI.
+     */
+    pci_bus_irqs(pci_bus, xen_piix3_set_irq, xen_pci_slot_get_pirq,
+                 piix3, XEN_PIIX_NUM_PIRQS);
+};
+
 static void piix3_xen_class_init(ObjectClass *klass, void *data)
 {
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
     k->config_write = piix3_write_config_xen;
+    k->realize = piix3_xen_realize;
 };
 
 static const TypeInfo piix3_xen_info = {
@@ -368,27 +407,11 @@ PIIX3State *piix3_create(PCIBus *pci_bus, ISABus **isa_bus)
 {
     PIIX3State *piix3;
     PCIDevice *pci_dev;
+    const char *type = xen_enabled() ? TYPE_PIIX3_XEN_DEVICE
+                                     : TYPE_PIIX3_DEVICE;
 
-    /*
-     * Xen supports additional interrupt routes from the PCI devices to
-     * the IOAPIC: the four pins of each PCI device on the bus are also
-     * connected to the IOAPIC directly.
-     * These additional routes can be discovered through ACPI.
-     */
-    if (xen_enabled()) {
-        pci_dev = pci_create_simple_multifunction(pci_bus, -1, true,
-                                                  TYPE_PIIX3_XEN_DEVICE);
-        piix3 = PIIX3_PCI_DEVICE(pci_dev);
-        pci_bus_irqs(pci_bus, xen_piix3_set_irq, xen_pci_slot_get_pirq,
-                     piix3, XEN_PIIX_NUM_PIRQS);
-    } else {
-        pci_dev = pci_create_simple_multifunction(pci_bus, -1, true,
-                                                  TYPE_PIIX3_DEVICE);
-        piix3 = PIIX3_PCI_DEVICE(pci_dev);
-        pci_bus_irqs(pci_bus, piix3_set_irq, pci_slot_get_pirq,
-                     piix3, PIIX_NUM_PIRQS);
-        pci_bus_set_route_irq_fn(pci_bus, piix3_route_intx_pin_to_irq);
-    }
+    pci_dev = pci_create_simple_multifunction(pci_bus, -1, true, type);
+    piix3 = PIIX3_PCI_DEVICE(pci_dev);
     *isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(piix3), "isa.0"));
 
     return piix3;
diff --git a/hw/isa/piix4.c b/hw/isa/piix4.c
index a223b69e24..134d23aea7 100644
--- a/hw/isa/piix4.c
+++ b/hw/isa/piix4.c
@@ -204,6 +204,8 @@ static const MemoryRegionOps piix4_rcr_ops = {
 static void piix4_realize(PCIDevice *dev, Error **errp)
 {
     PIIX4State *s = PIIX4_PCI_DEVICE(dev);
+    PCIDevice *pci;
+    PCIBus *pci_bus = pci_get_bus(dev);
     ISABus *isa_bus;
     qemu_irq *i8259_out_irq;
 
@@ -242,6 +244,15 @@ static void piix4_realize(PCIDevice *dev, Error **errp)
         return;
     }
     s->rtc.irq = isa_get_irq(ISA_DEVICE(&s->rtc), s->rtc.isairq);
+
+    /* IDE */
+    pci = pci_create_simple(pci_bus, dev->devfn + 1, "piix4-ide");
+    pci_ide_create_devs(pci);
+
+    /* USB */
+    pci_create_simple(pci_bus, dev->devfn + 2, "piix4-usb-uhci");
+
+    pci_bus_irqs(pci_bus, piix4_set_irq, pci_slot_get_pirq, s, PIIX_NUM_PIRQS);
 }
 
 static void piix4_init(Object *obj)
@@ -292,7 +303,6 @@ type_init(piix4_register_types)
 
 DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus, I2CBus **smbus)
 {
-    PIIX4State *s;
     PCIDevice *pci;
     DeviceState *dev;
     int devfn = PCI_DEVFN(10, 0);
@@ -300,22 +310,16 @@ DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus, I2CBus **smbus)
     pci = pci_create_simple_multifunction(pci_bus, devfn,  true,
                                           TYPE_PIIX4_PCI_DEVICE);
     dev = DEVICE(pci);
-    s = PIIX4_PCI_DEVICE(pci);
+
     if (isa_bus) {
         *isa_bus = ISA_BUS(qdev_get_child_bus(dev, "isa.0"));
     }
 
-    pci = pci_create_simple(pci_bus, devfn + 1, "piix4-ide");
-    pci_ide_create_devs(pci);
-
-    pci_create_simple(pci_bus, devfn + 2, "piix4-usb-uhci");
     if (smbus) {
         *smbus = piix4_pm_init(pci_bus, devfn + 3, 0x1100,
                                qdev_get_gpio_in_named(dev, "isa", 9),
                                NULL, 0, NULL);
     }
 
-    pci_bus_irqs(pci_bus, piix4_set_irq, pci_slot_get_pirq, s, PIIX_NUM_PIRQS);
-
     return dev;
 }
-- 
2.36.1