drm/i915/gvt: add the missing mdev attribute "name"

The mdev attribute "name" is required by some middle software, e.g.
KubeVirt, an open source SW that manages VM on Kubernetes cluster uses
the mdev sysfs directory/file structure to discover mediated device in
nodes in the cluster.

v2:

- Fix the missing defination in gvt_type_attrs. (Zhenyu)

Cc: Zhenyu Wang <[email protected]>
Cc: Hui Chun Ong <[email protected]>
Cc: Terrence Xu <[email protected]>
Cc: Zhi Wang <[email protected]>
Signed-off-by: Zhi Wang <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Zhenyu Wang <[email protected]>

Author: zhi-wang-linux

drivers/gpu/drm/i915/gvt/kvmgt.c

@@ -186,14 +186,29 @@ static ssize_t description_show(struct mdev_type *mtype,
 		       type->weight);
 }
 
+static ssize_t name_show(struct mdev_type *mtype,
+			 struct mdev_type_attribute *attr, char *buf)
+{
+	struct intel_vgpu_type *type;
+	struct intel_gvt *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
+
+	type = &gvt->types[mtype_get_type_group_id(mtype)];
+	if (!type)
+		return 0;
+
+	return sprintf(buf, "%s\n", type->name);
+}
+
 static MDEV_TYPE_ATTR_RO(available_instances);
 static MDEV_TYPE_ATTR_RO(device_api);
 static MDEV_TYPE_ATTR_RO(description);
+static MDEV_TYPE_ATTR_RO(name);
 
 static struct attribute *gvt_type_attrs[] = {
 	&mdev_type_attr_available_instances.attr,
 	&mdev_type_attr_device_api.attr,
 	&mdev_type_attr_description.attr,
+	&mdev_type_attr_name.attr,
 	NULL,
 };