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qom: optimize qdev_get_canonical_path using a parent link

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The full tree search was a bit unreasonable.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori 2011-12-12 14:29:40 -06:00
parent 182970509b
commit b2b6c39a79
2 changed files with 34 additions and 38 deletions
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68
hw/qdev.c
View File

@ -1229,6 +1229,8 @@ void qdev_property_add_child(DeviceState *dev, const char *name,
NULL, NULL, child, errp);
qdev_ref(child);
g_assert(child->parent == NULL);
child->parent = dev;
g_free(type);
}
@ -1307,47 +1309,37 @@ void qdev_property_add_link(DeviceState *dev, const char *name,
g_free(full_type);
}
static gchar *qdev_get_path_in(DeviceState *parent, DeviceState *dev)
{
DeviceProperty *prop;
if (parent == dev) {
return g_strdup("");
}
QTAILQ_FOREACH(prop, &parent->properties, node) {
gchar *subpath;
if (!strstart(prop->type, "child<", NULL)) {
continue;
}
/* Check to see if the device is one of parent's children */
if (prop->opaque == dev) {
return g_strdup(prop->name);
}
/* Check to see if the device is a child of our child */
subpath = qdev_get_path_in(prop->opaque, dev);
if (subpath) {
gchar *path;
path = g_strdup_printf("%s/%s", prop->name, subpath);
g_free(subpath);
return path;
}
}
return NULL;
}
gchar *qdev_get_canonical_path(DeviceState *dev)
{
gchar *path, *newpath;
DeviceState *root = qdev_get_root();
char *newpath = NULL, *path = NULL;
path = qdev_get_path_in(qdev_get_root(), dev);
g_assert(path != NULL);
while (dev != root) {
DeviceProperty *prop = NULL;
g_assert(dev->parent != NULL);
QTAILQ_FOREACH(prop, &dev->parent->properties, node) {
if (!strstart(prop->type, "child<", NULL)) {
continue;
}
if (prop->opaque == dev) {
if (path) {
newpath = g_strdup_printf("%s/%s", prop->name, path);
g_free(path);
path = newpath;
} else {
path = g_strdup(prop->name);
}
break;
}
}
g_assert(prop != NULL);
dev = dev->parent;
}
newpath = g_strdup_printf("/%s", path);
g_free(path);

4
hw/qdev.h
View File

@ -92,6 +92,10 @@ struct DeviceState {
uint32_t ref;
QTAILQ_HEAD(, DeviceProperty) properties;
/* Do not, under any circumstance, use this parent link below anywhere
* outside of qdev.c. You have been warned. */
DeviceState *parent;
};
typedef void (*bus_dev_printfn)(Monitor *mon, DeviceState *dev, int indent);