ttm_kmap_iter_linear_io_init
ttm_kmap_iter_linear_io_init(struct ttm_kmap_iter_linear_io *iter_io,
dst_iter = ttm_kmap_iter_linear_io_init(&_dst_iter.io, bdev, dst_mem);
src_iter = ttm_kmap_iter_linear_io_init(&_src_iter.io, bdev, src_mem);