[Qemu-devel] [PATCH v2 15/36] qdev: HotplugHandler: provide unplug callback

[Igor Mammedov <imammedo@redhat.com>]

it to be called for actual device removal and
will allow to separate request and removal handling
phases of x86-CPU devices and also it's a handler
to be called for synchronously removable devices.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
---
unplug handling for bus-less devices will be added
later in this series.

v2:
 - fixup copypast error, s/unplug_request/unplug/
    spotted by Tang Chen <tangchen@cn.fujitsu.com>
---
 hw/core/hotplug.c    | 11 +++++++++++
 hw/core/qdev.c       | 13 +++++++++++--
 include/hw/hotplug.h | 12 ++++++++++++
 3 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/hw/core/hotplug.c b/hw/core/hotplug.c
index 2ec4736..4e01074 100644
--- a/hw/core/hotplug.c
+++ b/hw/core/hotplug.c
@@ -34,6 +34,17 @@ void hotplug_handler_unplug_request(HotplugHandler *plug_handler,
     }
 }
 
+void hotplug_handler_unplug(HotplugHandler *plug_handler,
+                            DeviceState *plugged_dev,
+                            Error **errp)
+{
+    HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
+
+    if (hdc->unplug) {
+        hdc->unplug(plug_handler, plugged_dev, errp);
+    }
+}
+
 static const TypeInfo hotplug_handler_info = {
     .name          = TYPE_HOTPLUG_HANDLER,
     .parent        = TYPE_INTERFACE,
diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index c98e5db..c89d781 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -227,8 +227,17 @@ void qdev_unplug(DeviceState *dev, Error **errp)
     qdev_hot_removed = true;
 
     if (dev->parent_bus && dev->parent_bus->hotplug_handler) {
-        hotplug_handler_unplug_request(dev->parent_bus->hotplug_handler,
-                                       dev, errp);
+        HotplugHandlerClass *hdc;
+
+        /* If device supports async unplug just request it to be done,
+         * otherwise just remove it synchronously */
+        hdc = HOTPLUG_HANDLER_GET_CLASS(dev->parent_bus->hotplug_handler);
+        if (hdc->unplug_request) {
+            hotplug_handler_unplug_request(dev->parent_bus->hotplug_handler,
+                                           dev, errp);
+        } else {
+            hotplug_handler_unplug(dev->parent_bus->hotplug_handler, dev, errp);
+        }
     } else {
         assert(dc->unplug != NULL);
         if (dc->unplug(dev) < 0) { /* legacy handler */
diff --git a/include/hw/hotplug.h b/include/hw/hotplug.h
index e397d08..050d2f0 100644
--- a/include/hw/hotplug.h
+++ b/include/hw/hotplug.h
@@ -50,6 +50,9 @@ typedef void (*hotplug_fn)(HotplugHandler *plug_handler,
  * @unplug_request: unplug request callback.
  *                  Used as a means to initiate device unplug for devices that
  *                  require asynchronous unplug handling.
+ * @unplug: unplug callback.
+ *          Used for device removal with devices that implement
+ *          asynchronous and synchronous (suprise) removal.
  */
 typedef struct HotplugHandlerClass {
     /* <private> */
@@ -58,6 +61,7 @@ typedef struct HotplugHandlerClass {
     /* <public> */
     hotplug_fn plug;
     hotplug_fn unplug_request;
+    hotplug_fn unplug;
 } HotplugHandlerClass;
 
 /**
@@ -77,4 +81,12 @@ void hotplug_handler_plug(HotplugHandler *plug_handler,
 void hotplug_handler_unplug_request(HotplugHandler *plug_handler,
                                     DeviceState *plugged_dev,
                                     Error **errp);
+/**
+ * hotplug_handler_unplug:
+ *
+ * Calls #HotplugHandlerClass.unplug callback of @plug_handler.
+ */
+void hotplug_handler_unplug(HotplugHandler *plug_handler,
+                            DeviceState *plugged_dev,
+                            Error **errp);
 #endif
-- 
1.8.3.1