hw/intc/loongarch_extioi: Implment cpu hotplug interface

When cpu is added, connect extioi gpio irq to CPU irq pin.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>

hw/intc/loongarch_extioi_common.c

@@ -12,28 +12,73 @@
 #include "migration/vmstate.h"
 #include "target/loongarch/cpu.h"
 
+static ExtIOICore *loongarch_extioi_get_cpu(LoongArchExtIOICommonState *s,
+                                            DeviceState *dev)
+{
+    CPUClass *k = CPU_GET_CLASS(dev);
+    uint64_t arch_id = k->get_arch_id(CPU(dev));
+    int i;
+
+    for (i = 0; i < s->num_cpu; i++) {
+        if (s->cpu[i].arch_id == arch_id) {
+            return &s->cpu[i];
+        }
+    }
+
+    return NULL;
+}
+
 static void loongarch_extioi_cpu_plug(HotplugHandler *hotplug_dev,
                                       DeviceState *dev, Error **errp)
 {
+    LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(hotplug_dev);
     Object *obj = OBJECT(dev);
+    ExtIOICore *core;
+    int pin, index;
 
     if (!object_dynamic_cast(obj, TYPE_LOONGARCH_CPU)) {
         warn_report("LoongArch extioi: Invalid %s device type",
                                        object_get_typename(obj));
         return;
     }
+
+    core = loongarch_extioi_get_cpu(s, dev);
+    if (!core) {
+        return;
+    }
+
+    core->cpu = CPU(dev);
+    index = core - s->cpu;
+
+    /*
+     * connect extioi irq to the cpu irq
+     * cpu_pin[LS3A_INTC_IP + 2 : 2] <= intc_pin[LS3A_INTC_IP : 0]
+     */
+    for (pin = 0; pin < LS3A_INTC_IP; pin++) {
+        qdev_connect_gpio_out(DEVICE(s), index * LS3A_INTC_IP + pin,
+                              qdev_get_gpio_in(dev, pin + 2));
+    }
 }
 
 static void loongarch_extioi_cpu_unplug(HotplugHandler *hotplug_dev,
                                         DeviceState *dev, Error **errp)
 {
+    LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(hotplug_dev);
     Object *obj = OBJECT(dev);
+    ExtIOICore *core;
 
     if (!object_dynamic_cast(obj, TYPE_LOONGARCH_CPU)) {
         warn_report("LoongArch extioi: Invalid %s device type",
                                        object_get_typename(obj));
         return;
     }
+
+    core = loongarch_extioi_get_cpu(s, dev);
+    if (!core) {
+        return;
+    }
+
+    core->cpu = NULL;
 }
 
 static void loongarch_extioi_common_realize(DeviceState *dev, Error **errp)