fix ep prefill (#2762)

fastdeploy/model_executor/layers/attention/utils.py

@@ -0,0 +1,36 @@
+"""
+# Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+
+import os
+from fastdeploy.config import FDConfig
+
+def init_rank_and_device_id(fd_config: FDConfig):
+    """
+    
+    """
+    rank = (fd_config.parallel_config.expert_parallel_rank * 
+        fd_config.parallel_config.tensor_parallel_degree + fd_config.parallel_config.tensor_parallel_rank)
+
+    cuda_visible_devices = os.getenv("CUDA_VISIBLE_DEVICES", None)
+
+    if cuda_visible_devices is None:
+        device_id = rank
+    else:
+        cuda_visible_devices = cuda_visible_devices.split(",")
+        rank_index = rank % len(cuda_visible_devices)
+        device_id = cuda_visible_devices[rank_index]
+
+    return rank, device_id