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qdev: Move bus properties to abstract superclasses

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In qdev, each bus in practice identified an abstract superclass, but
this was mostly hidden.  In QOM, instead, these abstract classes are
explicit so we can move bus properties there.

All bus property walks are removed, and all device property walks
are changed to look along the class hierarchy instead.

We would have duplicates if class A defines some properties and its
subclass B does not define any, because class_b->props will be
left equal to class_a->props.

The solution here is to reintroduce the class_base_init TypeInfo
callback, that was present in one of the early QOM versions but
removed (on my request...) before committing.

This breaks global bus properties, an obscure feature when used
with the command-line which is actually useful and used when used by
backwards-compatible machine types.  So this patch also adjusts the
global bus properties in hw/pc_piix.c to refer to the abstract class.

Globals and other properties must be modified in the same patch to
avoid complications related to initialization ordering.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Paolo Bonzini 2012-03-28 18:12:47 +02:00 • committed by Andreas Färber
parent 3cb75a7cba
commit bce544740a
14 changed files with 73 additions and 83 deletions
Download patch file Download diff file Expand all files Collapse all files

38
hw/qdev-properties.c
View file

@ -915,17 +915,18 @@ static Property *qdev_prop_walk(Property *props, const char *name)
static Property *qdev_prop_find(DeviceState *dev, const char *name)
{
ObjectClass *class;
Property *prop;
/* device properties */
prop = qdev_prop_walk(qdev_get_props(dev), name);
if (prop)
return prop;
/* bus properties */
prop = qdev_prop_walk(dev->parent_bus->info->props, name);
if (prop)
return prop;
class = object_get_class(OBJECT(dev));
do {
prop = qdev_prop_walk(DEVICE_CLASS(class)->props, name);
if (prop) {
return prop;
}
class = object_class_get_parent(class);
} while (class != object_class_by_name(TYPE_DEVICE));
return NULL;
}
@ -1145,17 +1146,20 @@ void qdev_prop_register_global_list(GlobalProperty *props)
void qdev_prop_set_globals(DeviceState *dev)
{
GlobalProperty *prop;
ObjectClass *class = object_get_class(OBJECT(dev));
QTAILQ_FOREACH(prop, &global_props, next) {
if (strcmp(object_get_typename(OBJECT(dev)), prop->driver) != 0 &&
strcmp(qdev_get_bus_info(dev)->name, prop->driver) != 0) {
continue;
do {
GlobalProperty *prop;
QTAILQ_FOREACH(prop, &global_props, next) {
if (strcmp(object_class_get_name(class), prop->driver) != 0) {
continue;
}
if (qdev_prop_parse(dev, prop->property, prop->value) != 0) {
exit(1);
}
}
if (qdev_prop_parse(dev, prop->property, prop->value) != 0) {
exit(1);
}
}
class = object_class_get_parent(class);
} while (class);
}
static int qdev_add_one_global(QemuOpts *opts, void *opaque)