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author | Paul Durrant <paul.durrant@citrix.com> | 2015-01-20 11:05:07 +0000 |
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committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2015-01-20 14:24:07 +0000 |
commit | 707ff80021ccd7a68f4b3d2c44eebf87efbb41c4 (patch) | |
tree | 47a10385f3ec3ee9750d40ed44c0569f348119e9 | |
parent | 74acb99737dbedd86654d660c0c20815139a873c (diff) | |
download | hqemu-707ff80021ccd7a68f4b3d2c44eebf87efbb41c4.zip hqemu-707ff80021ccd7a68f4b3d2c44eebf87efbb41c4.tar.gz |
Add device listener interface
The Xen ioreq-server API, introduced in Xen 4.5, requires that PCI device
models explicitly register with Xen for config space accesses. This patch
adds a listener interface into qdev-core which can be used by the Xen
interface code to monitor for arrival and departure of PCI devices.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r-- | hw/core/qdev.c | 53 | ||||
-rw-r--r-- | include/hw/qdev-core.h | 10 | ||||
-rw-r--r-- | include/qemu/typedefs.h | 1 |
3 files changed, 64 insertions, 0 deletions
diff --git a/hw/core/qdev.c b/hw/core/qdev.c index 901f289..2eacac0 100644 --- a/hw/core/qdev.c +++ b/hw/core/qdev.c @@ -189,6 +189,56 @@ int qdev_init(DeviceState *dev) return 0; } +static QTAILQ_HEAD(device_listeners, DeviceListener) device_listeners + = QTAILQ_HEAD_INITIALIZER(device_listeners); + +enum ListenerDirection { Forward, Reverse }; + +#define DEVICE_LISTENER_CALL(_callback, _direction, _args...) \ + do { \ + DeviceListener *_listener; \ + \ + switch (_direction) { \ + case Forward: \ + QTAILQ_FOREACH(_listener, &device_listeners, link) { \ + if (_listener->_callback) { \ + _listener->_callback(_listener, ##_args); \ + } \ + } \ + break; \ + case Reverse: \ + QTAILQ_FOREACH_REVERSE(_listener, &device_listeners, \ + device_listeners, link) { \ + if (_listener->_callback) { \ + _listener->_callback(_listener, ##_args); \ + } \ + } \ + break; \ + default: \ + abort(); \ + } \ + } while (0) + +static int device_listener_add(DeviceState *dev, void *opaque) +{ + DEVICE_LISTENER_CALL(realize, Forward, dev); + + return 0; +} + +void device_listener_register(DeviceListener *listener) +{ + QTAILQ_INSERT_TAIL(&device_listeners, listener, link); + + qbus_walk_children(sysbus_get_default(), NULL, NULL, device_listener_add, + NULL, NULL); +} + +void device_listener_unregister(DeviceListener *listener) +{ + QTAILQ_REMOVE(&device_listeners, listener, link); +} + static void device_realize(DeviceState *dev, Error **errp) { DeviceClass *dc = DEVICE_GET_CLASS(dev); @@ -994,6 +1044,8 @@ static void device_set_realized(Object *obj, bool value, Error **errp) goto fail; } + DEVICE_LISTENER_CALL(realize, Forward, dev); + hotplug_ctrl = qdev_get_hotplug_handler(dev); if (hotplug_ctrl) { hotplug_handler_plug(hotplug_ctrl, dev, &local_err); @@ -1035,6 +1087,7 @@ static void device_set_realized(Object *obj, bool value, Error **errp) dc->unrealize(dev, local_errp); } dev->pending_deleted_event = true; + DEVICE_LISTENER_CALL(unrealize, Reverse, dev); } if (local_err != NULL) { diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index 589bbe7..15a226f 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -165,6 +165,12 @@ struct DeviceState { int alias_required_for_version; }; +struct DeviceListener { + void (*realize)(DeviceListener *listener, DeviceState *dev); + void (*unrealize)(DeviceListener *listener, DeviceState *dev); + QTAILQ_ENTRY(DeviceListener) link; +}; + #define TYPE_BUS "bus" #define BUS(obj) OBJECT_CHECK(BusState, (obj), TYPE_BUS) #define BUS_CLASS(klass) OBJECT_CLASS_CHECK(BusClass, (klass), TYPE_BUS) @@ -376,4 +382,8 @@ static inline bool qbus_is_hotpluggable(BusState *bus) { return bus->hotplug_handler; } + +void device_listener_register(DeviceListener *listener); +void device_listener_unregister(DeviceListener *listener); + #endif diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h index f2bbaaf..cde3314 100644 --- a/include/qemu/typedefs.h +++ b/include/qemu/typedefs.h @@ -17,6 +17,7 @@ typedef struct BusState BusState; typedef struct CharDriverState CharDriverState; typedef struct CompatProperty CompatProperty; typedef struct DeviceState DeviceState; +typedef struct DeviceListener DeviceListener; typedef struct DisplayChangeListener DisplayChangeListener; typedef struct DisplayState DisplayState; typedef struct DisplaySurface DisplaySurface; |