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
54 	rc = xa_alloc(&ictx->objects, &obj->id, XA_ZERO_ENTRY,  in _iommufd_object_alloc()
68  * destruction. Expect for special kernel-only objects there is no in-kernel way
69  * to reliably destroy a single object. Thus all APIs that are creating objects
78 	old = xa_store(&ictx->objects, obj->id, obj, GFP_KERNEL);  in iommufd_object_finalize()
88 	old = xa_erase(&ictx->objects, obj->id);  in iommufd_object_abort()
115 	xa_lock(&ictx->objects);  in iommufd_get_object()
116 	obj = xa_load(&ictx->objects, id);  in iommufd_get_object()
120 	xa_unlock(&ictx->objects);  in iommufd_get_object()
150 	XA_STATE(xas, &ictx->objects, id);  in iommufd_object_remove()
156 	 * destruction of objects used by external drivers and destroyed by this  in iommufd_object_remove()
173 	xa_lock(&ictx->objects);  in iommufd_object_remove()
199 	xa_unlock(&ictx->objects);  in iommufd_object_remove()
220 	xa_unlock(&ictx->objects);  in iommufd_object_remove()
251 	xa_init_flags(&ictx->objects, XA_FLAGS_ALLOC1 | XA_FLAGS_ACCOUNT);  in iommufd_fops_open()
265 	 * The objects in the xarray form a graph of "users" counts, and we have  in iommufd_fops_release()
266 	 * to destroy them in a depth first manner. Leaf objects will reduce the  in iommufd_fops_release()
267 	 * users count of interior objects when they are destroyed.  in iommufd_fops_release()
269 	 * Repeatedly destroying all the "1 users" leaf objects will progress  in iommufd_fops_release()
273 	while (!xa_empty(&ictx->objects)) {  in iommufd_fops_release()
277 		xa_for_each(&ictx->objects, index, obj) {  in iommufd_fops_release()
281 			xa_erase(&ictx->objects, index);  in iommufd_fops_release()