commit 9d71149a64f0ab051575a3f534e80918a3ca8610
author Bibo Mao <maobibo@loongson.cn> Mon Jan 20 10:49:19 2025 +0800
committer Bibo Mao <maobibo@loongson.cn> Wed Mar 05 09:39:17 2025 +0800
tree 077ea80accfdc75750c05480dd66110954fbbcf7
parent 661c2e1ab29cd9c4d268ae3f44712e8d421c0e56

hw/intc/loongarch_ipi: Add basic hotplug framework

LoongArch ipi can send interrupt to multiple CPUs, interrupt routing
to CPU comes from destination physical cpu id. Here hotplug interface
is added for IPI object, so that parent irq line can be connected, and
routing table can be added for new created cpu.

Here only basic hotplug framework is added, it is stub function.

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

hw/intc/loongarch_ipi.c

diff --git a/hw/intc/loongarch_ipi.c b/hw/intc/loongarch_ipi.c
index 5376f1e..90bbb7a 100644
--- a/hw/intc/loongarch_ipi.c
+++ b/hw/intc/loongarch_ipi.c
@@ -6,6 +6,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/error-report.h"
 #include "hw/boards.h"
 #include "qapi/error.h"
 #include "hw/intc/loongarch_ipi.h"
@@ -76,9 +77,34 @@
     }
 }
 
+static void loongarch_ipi_cpu_plug(HotplugHandler *hotplug_dev,
+                                   DeviceState *dev, Error **errp)
+{
+    Object *obj = OBJECT(dev);
+
+    if (!object_dynamic_cast(obj, TYPE_LOONGARCH_CPU)) {
+        warn_report("LoongArch extioi: Invalid %s device type",
+                                       object_get_typename(obj));
+        return;
+    }
+}
+
+static void loongarch_ipi_cpu_unplug(HotplugHandler *hotplug_dev,
+                                     DeviceState *dev, Error **errp)
+{
+    Object *obj = OBJECT(dev);
+
+    if (!object_dynamic_cast(obj, TYPE_LOONGARCH_CPU)) {
+        warn_report("LoongArch extioi: Invalid %s device type",
+                                       object_get_typename(obj));
+        return;
+    }
+}
+
 static void loongarch_ipi_class_init(ObjectClass *klass, void *data)
 {
     LoongsonIPICommonClass *licc = LOONGSON_IPI_COMMON_CLASS(klass);
+    HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
     LoongarchIPIClass *lic = LOONGARCH_IPI_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
 
@@ -86,6 +112,8 @@
                                     &lic->parent_realize);
     licc->get_iocsr_as = get_iocsr_as;
     licc->cpu_by_arch_id = loongarch_cpu_by_arch_id;
+    hc->plug = loongarch_ipi_cpu_plug;
+    hc->unplug = loongarch_ipi_cpu_unplug;
 }
 
 static const TypeInfo loongarch_ipi_types[] = {
@@ -95,6 +123,10 @@
         .instance_size      = sizeof(LoongarchIPIState),
         .class_size         = sizeof(LoongarchIPIClass),
         .class_init         = loongarch_ipi_class_init,
+        .interfaces         = (InterfaceInfo[]) {
+            { TYPE_HOTPLUG_HANDLER },
+            { }
+        },
     }
 };