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qom: add new dynamic property infrastructure based on Visitors (v2)

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qdev properties are settable only during construction and static to classes.
This isn't flexible enough for QOM.

This patch introduces a property interface for qdev that provides dynamic
properties that are tied to objects, instead of classes.  These properties are
Visitor based instead of string based too.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori 2011-12-12 14:29:26 -06:00
parent 85ed303bfe
commit 44677ded43
4 changed files with 224 additions and 0 deletions
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97
hw/qdev.c
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@ -98,6 +98,7 @@ static DeviceState *qdev_create_from_info(BusState *bus, DeviceInfo *info)
qdev_hot_added = true;
}
dev->instance_id_alias = -1;
QTAILQ_INIT(&dev->properties);
dev->state = DEV_STATE_CREATED;
return dev;
}
@ -395,12 +396,31 @@ void qdev_init_nofail(DeviceState *dev)
}
}
static void qdev_property_del_all(DeviceState *dev)
{
while (!QTAILQ_EMPTY(&dev->properties)) {
DeviceProperty *prop = QTAILQ_FIRST(&dev->properties);
QTAILQ_REMOVE(&dev->properties, prop, node);
if (prop->release) {
prop->release(dev, prop->name, prop->opaque);
}
g_free(prop->name);
g_free(prop->type);
g_free(prop);
}
}
/* Unlink device from bus and free the structure. */
void qdev_free(DeviceState *dev)
{
BusState *bus;
Property *prop;
qdev_property_del_all(dev);
if (dev->state == DEV_STATE_INITIALIZED) {
while (dev->num_child_bus) {
bus = QLIST_FIRST(&dev->child_bus);
@ -978,3 +998,80 @@ void qdev_unref(DeviceState *dev)
g_assert(dev->ref > 0);
dev->ref--;
}
void qdev_property_add(DeviceState *dev, const char *name, const char *type,
DevicePropertyAccessor *get, DevicePropertyAccessor *set,
DevicePropertyRelease *release,
void *opaque, Error **errp)
{
DeviceProperty *prop = g_malloc0(sizeof(*prop));
prop->name = g_strdup(name);
prop->type = g_strdup(type);
prop->get = get;
prop->set = set;
prop->release = release;
prop->opaque = opaque;
QTAILQ_INSERT_TAIL(&dev->properties, prop, node);
}
static DeviceProperty *qdev_property_find(DeviceState *dev, const char *name)
{
DeviceProperty *prop;
QTAILQ_FOREACH(prop, &dev->properties, node) {
if (strcmp(prop->name, name) == 0) {
return prop;
}
}
return NULL;
}
void qdev_property_get(DeviceState *dev, Visitor *v, const char *name,
Error **errp)
{
DeviceProperty *prop = qdev_property_find(dev, name);
if (prop == NULL) {
error_set(errp, QERR_PROPERTY_NOT_FOUND, dev->id?:"", name);
return;
}
if (!prop->get) {
error_set(errp, QERR_PERMISSION_DENIED);
} else {
prop->get(dev, v, prop->opaque, name, errp);
}
}
void qdev_property_set(DeviceState *dev, Visitor *v, const char *name,
Error **errp)
{
DeviceProperty *prop = qdev_property_find(dev, name);
if (prop == NULL) {
error_set(errp, QERR_PROPERTY_NOT_FOUND, dev->id?:"", name);
return;
}
if (!prop->set) {
error_set(errp, QERR_PERMISSION_DENIED);
} else {
prop->set(dev, prop->opaque, v, name, errp);
}
}
const char *qdev_property_get_type(DeviceState *dev, const char *name, Error **errp)
{
DeviceProperty *prop = qdev_property_find(dev, name);
if (prop == NULL) {
error_set(errp, QERR_PROPERTY_NOT_FOUND, dev->id?:"", name);
return NULL;
}
return prop->type;
}