hw/arm_gic: Convert ARM GIC classes to use init/realize

Convert the ARM GIC classes to use init/realize rather than
SysBusDevice::init. (We have to do them all in one patch to
avoid unconverted subclasses calling a nonexistent SysBusDevice
init function in the base class and crashing.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>

hw/arm_gic.c

@@ -659,14 +659,18 @@ void gic_init_irqs_and_distributor(GICState *s, int num_irq)
     memory_region_init_io(&s->iomem, &gic_dist_ops, s, "gic_dist", 0x1000);
 }
 
-static int arm_gic_init(SysBusDevice *dev)
+static void arm_gic_realize(DeviceState *dev, Error **errp)
 {
-    /* Device instance init function for the GIC sysbus device */
+    /* Device instance realize function for the GIC sysbus device */
     int i;
-    GICState *s = FROM_SYSBUS(GICState, dev);
+    GICState *s = ARM_GIC(dev);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
     ARMGICClass *agc = ARM_GIC_GET_CLASS(s);
 
-    agc->parent_init(dev);
+    agc->parent_realize(dev, errp);
+    if (error_is_set(errp)) {
+        return;
+    }
 
     gic_init_irqs_and_distributor(s, s->num_irq);
 
@@ -686,22 +690,21 @@ static int arm_gic_init(SysBusDevice *dev)
                               "gic_cpu", 0x100);
     }
     /* Distributor */
-    sysbus_init_mmio(dev, &s->iomem);
+    sysbus_init_mmio(sbd, &s->iomem);
     /* cpu interfaces (one for "current cpu" plus one per cpu) */
     for (i = 0; i <= NUM_CPU(s); i++) {
-        sysbus_init_mmio(dev, &s->cpuiomem[i]);
+        sysbus_init_mmio(sbd, &s->cpuiomem[i]);
     }
-    return 0;
 }
 
 static void arm_gic_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
-    SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(klass);
     ARMGICClass *agc = ARM_GIC_CLASS(klass);
-    agc->parent_init = sbc->init;
+
-    sbc->init = arm_gic_init;
     dc->no_user = 1;
+    agc->parent_realize = dc->realize;
+    dc->realize = arm_gic_realize;
 }
 
 static const TypeInfo arm_gic_info = {

hw/arm_gic_common.c

@@ -104,31 +104,35 @@ static int gic_load(QEMUFile *f, void *opaque, int version_id)
     return 0;
 }
 
-static int arm_gic_common_init(SysBusDevice *dev)
+static void arm_gic_common_realize(DeviceState *dev, Error **errp)
 {
-    GICState *s = FROM_SYSBUS(GICState, dev);
+    GICState *s = ARM_GIC_COMMON(dev);
     int num_irq = s->num_irq;
 
     if (s->num_cpu > NCPU) {
-        hw_error("requested %u CPUs exceeds GIC maximum %d\n",
+        error_setg(errp, "requested %u CPUs exceeds GIC maximum %d",
-                 s->num_cpu, NCPU);
+                   s->num_cpu, NCPU);
+        return;
     }
     s->num_irq += GIC_BASE_IRQ;
     if (s->num_irq > GIC_MAXIRQ) {
-        hw_error("requested %u interrupt lines exceeds GIC maximum %d\n",
+        error_setg(errp,
-                 num_irq, GIC_MAXIRQ);
+                   "requested %u interrupt lines exceeds GIC maximum %d",
+                   num_irq, GIC_MAXIRQ);
+        return;
     }
     /* ITLinesNumber is represented as (N / 32) - 1 (see
      * gic_dist_readb) so this is an implementation imposed
      * restriction, not an architectural one:
      */
     if (s->num_irq < 32 || (s->num_irq % 32)) {
-        hw_error("%d interrupt lines unsupported: not divisible by 32\n",
+        error_setg(errp,
-                 num_irq);
+                   "%d interrupt lines unsupported: not divisible by 32",
+                   num_irq);
+        return;
     }
 
     register_savevm(NULL, "arm_gic", -1, 3, gic_save, gic_load, s);
-    return 0;
 }
 
 static void arm_gic_common_reset(DeviceState *dev)
@@ -173,12 +177,12 @@ static Property arm_gic_common_properties[] = {
 
 static void arm_gic_common_class_init(ObjectClass *klass, void *data)
 {
-    SysBusDeviceClass *sc = SYS_BUS_DEVICE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
+
     dc->reset = arm_gic_common_reset;
+    dc->realize = arm_gic_common_realize;
     dc->props = arm_gic_common_properties;
     dc->no_user = 1;
-    sc->init = arm_gic_common_init;
 }
 
 static const TypeInfo arm_gic_common_type = {

hw/arm_gic_internal.h

@@ -132,7 +132,7 @@ typedef struct ARMGICCommonClass {
 
 typedef struct ARMGICClass {
     ARMGICCommonClass parent_class;
-    int (*parent_init)(SysBusDevice *dev);
+    DeviceRealize parent_realize;
 } ARMGICClass;
 
 #endif /* !QEMU_ARM_GIC_INTERNAL_H */

hw/armv7m_nvic.c

@@ -41,7 +41,7 @@ typedef struct NVICClass {
     /*< private >*/
     ARMGICClass parent_class;
     /*< public >*/
-    int (*parent_init)(SysBusDevice *dev);
+    DeviceRealize parent_realize;
     void (*parent_reset)(DeviceState *dev);
 } NVICClass;
 
@@ -465,7 +465,7 @@ static void armv7m_nvic_reset(DeviceState *dev)
     systick_reset(s);
 }
 
-static int armv7m_nvic_init(SysBusDevice *dev)
+static void armv7m_nvic_realize(DeviceState *dev, Error **errp)
 {
     nvic_state *s = NVIC(dev);
     NVICClass *nc = NVIC_GET_CLASS(s);
@@ -475,7 +475,10 @@ static int armv7m_nvic_init(SysBusDevice *dev)
     /* Tell the common code we're an NVIC */
     s->gic.revision = 0xffffffff;
     s->num_irq = s->gic.num_irq;
-    nc->parent_init(dev);
+    nc->parent_realize(dev, errp);
+    if (error_is_set(errp)) {
+        return;
+    }
     gic_init_irqs_and_distributor(&s->gic, s->num_irq);
     /* The NVIC and system controller register area looks like this:
      *  0..0xff : system control registers, including systick
@@ -503,7 +506,6 @@ static int armv7m_nvic_init(SysBusDevice *dev)
      */
     memory_region_add_subregion(get_system_memory(), 0xe000e000, &s->container);
     s->systick.timer = qemu_new_timer_ns(vm_clock, systick_timer_tick, s);
-    return 0;
 }
 
 static void armv7m_nvic_instance_init(Object *obj)
@@ -526,13 +528,12 @@ static void armv7m_nvic_class_init(ObjectClass *klass, void *data)
 {
     NVICClass *nc = NVIC_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
-    SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
 
     nc->parent_reset = dc->reset;
-    nc->parent_init = sdc->init;
+    nc->parent_realize = dc->realize;
-    sdc->init = armv7m_nvic_init;
     dc->vmsd  = &vmstate_nvic;
     dc->reset = armv7m_nvic_reset;
+    dc->realize = armv7m_nvic_realize;
 }
 
 static const TypeInfo armv7m_nvic_info = {