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qdev: add HotplugHandler->post_plug() callback

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The ->pre_plug() callback is invoked before the device is realized.  The
->plug() callback is invoked when the device is being realized but
before it is reset.

This patch adds a ->post_plug() callback which is invoked after the
device has been reset.  This callback is needed by HotplugHandlers that
need to wait until after ->reset().

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20180716083732.3347-2-stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2018-07-16 09:37:31 +01:00 committed by Paolo Bonzini
parent f3575af130
commit 25e8978817
3 changed files with 25 additions and 0 deletions
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10
hw/core/hotplug.c
View file

@ -35,6 +35,16 @@ void hotplug_handler_plug(HotplugHandler *plug_handler,
}
}
void hotplug_handler_post_plug(HotplugHandler *plug_handler,
DeviceState *plugged_dev)
{
HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
if (hdc->post_plug) {
hdc->post_plug(plug_handler, plugged_dev);
}
}
void hotplug_handler_unplug_request(HotplugHandler *plug_handler,
DeviceState *plugged_dev,
Error **errp)

4
hw/core/qdev.c
View file

@ -867,6 +867,10 @@ static void device_set_realized(Object *obj, bool value, Error **errp)
device_reset(dev);
}
dev->pending_deleted_event = false;
if (hotplug_ctrl) {
hotplug_handler_post_plug(hotplug_ctrl, dev);
}
} else if (!value && dev->realized) {
Error **local_errp = NULL;
QLIST_FOREACH(bus, &dev->child_bus, sibling) {

11
include/hw/hotplug.h
View file

@ -47,6 +47,8 @@ typedef void (*hotplug_fn)(HotplugHandler *plug_handler,
* @parent: Opaque parent interface.
* @pre_plug: pre plug callback called at start of device.realize(true)
* @plug: plug callback called at end of device.realize(true).
* @post_plug: post plug callback called after device.realize(true) and device
* reset
* @unplug_request: unplug request callback.
* Used as a means to initiate device unplug for devices that
* require asynchronous unplug handling.
@ -61,6 +63,7 @@ typedef struct HotplugHandlerClass {
/* <public> */
hotplug_fn pre_plug;
hotplug_fn plug;
void (*post_plug)(HotplugHandler *plug_handler, DeviceState *plugged_dev);
hotplug_fn unplug_request;
hotplug_fn unplug;
} HotplugHandlerClass;
@ -83,6 +86,14 @@ void hotplug_handler_pre_plug(HotplugHandler *plug_handler,
DeviceState *plugged_dev,
Error **errp);
/**
* hotplug_handler_post_plug:
*
* Call #HotplugHandlerClass.post_plug callback of @plug_handler.
*/
void hotplug_handler_post_plug(HotplugHandler *plug_handler,
DeviceState *plugged_dev);
/**
* hotplug_handler_unplug_request:
*