hw/loongarch: Add hotplug handler for machine

Add hotplug handler for LoongArch virt machine and now only support
the dynamic sysbus device.

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Acked-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20220908094623.73051-6-yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>

1 files changed, 32 insertions, 0 deletions

diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index 5fd3834..eedff10 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -803,9 +803,35 @@ static void loongarch_machine_initfn(Object *obj)
     lams->oem_table_id = g_strndup(ACPI_BUILD_APPNAME8, 8);
 }
 
+static void loongarch_machine_device_plug_cb(HotplugHandler *hotplug_dev,
+                                        DeviceState *dev, Error **errp)
+{
+    LoongArchMachineState *lams = LOONGARCH_MACHINE(hotplug_dev);
+    MachineClass *mc = MACHINE_GET_CLASS(lams);
+
+    if (device_is_dynamic_sysbus(mc, dev)) {
+        if (lams->platform_bus_dev) {
+            platform_bus_link_device(PLATFORM_BUS_DEVICE(lams->platform_bus_dev),
+                                     SYS_BUS_DEVICE(dev));
+        }
+    }
+}
+
+static HotplugHandler *virt_machine_get_hotplug_handler(MachineState *machine,
+                                                        DeviceState *dev)
+{
+    MachineClass *mc = MACHINE_GET_CLASS(machine);
+
+    if (device_is_dynamic_sysbus(mc, dev)) {
+        return HOTPLUG_HANDLER(machine);
+    }
+    return NULL;
+}
+
 static void loongarch_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
+    HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
 
     mc->desc = "Loongson-3A5000 LS7A1000 machine";
     mc->init = loongarch_init;
@@ -818,6 +844,8 @@ static void loongarch_class_init(ObjectClass *oc, void *data)
     mc->block_default_type = IF_VIRTIO;
     mc->default_boot_order = "c";
     mc->no_cdrom = 1;
+    mc->get_hotplug_handler = virt_machine_get_hotplug_handler;
+    hc->plug = loongarch_machine_device_plug_cb;
 
     object_class_property_add(oc, "acpi", "OnOffAuto",
         loongarch_get_acpi, loongarch_set_acpi,
@@ -833,6 +861,10 @@ static const TypeInfo loongarch_machine_types[] = {
         .instance_size  = sizeof(LoongArchMachineState),
         .class_init     = loongarch_class_init,
         .instance_init = loongarch_machine_initfn,
+        .interfaces = (InterfaceInfo[]) {
+         { TYPE_HOTPLUG_HANDLER },
+         { }
+        },
     }
 };