5  * iommufd provides control over the IOMMU HW objects created by IOMMU kernel
6  * drivers. IOMMU HW objects revolve around IO page tables that map incoming DMA
36  * destruction. Expect for special kernel-only objects there is no in-kernel way
37  * to reliably destroy a single object. Thus all APIs that are creating objects
44 	XA_STATE(xas, &ictx->objects, obj->id);  in iommufd_object_finalize()
47 	xa_lock(&ictx->objects);  in iommufd_object_finalize()
49 	xa_unlock(&ictx->objects);  in iommufd_object_finalize()
57 	XA_STATE(xas, &ictx->objects, obj->id);  in iommufd_object_abort()
60 	xa_lock(&ictx->objects);  in iommufd_object_abort()
62 	xa_unlock(&ictx->objects);  in iommufd_object_abort()
89 	xa_lock(&ictx->objects);  in iommufd_get_object()
90 	obj = xa_load(&ictx->objects, id);  in iommufd_get_object()
94 	xa_unlock(&ictx->objects);  in iommufd_get_object()
124 	XA_STATE(xas, &ictx->objects, id);  in iommufd_object_remove()
130 	 * destruction of objects used by external drivers and destroyed by this  in iommufd_object_remove()
147 	xa_lock(&ictx->objects);  in iommufd_object_remove()
173 	xa_unlock(&ictx->objects);  in iommufd_object_remove()
194 	xa_unlock(&ictx->objects);  in iommufd_object_remove()
226 	xa_init_flags(&ictx->objects, XA_FLAGS_ALLOC1 | XA_FLAGS_ACCOUNT);  in iommufd_fops_open()
244 	 * The objects in the xarray form a graph of "users" counts, and we have  in iommufd_fops_release()
245 	 * to destroy them in a depth first manner. Leaf objects will reduce the  in iommufd_fops_release()
246 	 * users count of interior objects when they are destroyed.  in iommufd_fops_release()
248 	 * Repeatedly destroying all the "1 users" leaf objects will progress  in iommufd_fops_release()
252 	while (!xa_empty(&ictx->objects)) {  in iommufd_fops_release()
256 		xa_for_each(&ictx->objects, index, obj) {  in iommufd_fops_release()
260 			xa_erase(&ictx->objects, index);  in iommufd_fops_release()