[Auto Sync] Update model_runner.py (20250920) (#10679)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

python/sglang/srt/model_executor/model_runner.py

@@ -147,6 +147,25 @@ from sglang.srt.weight_sync.tensor_bucket import (
     FlattenedTensorMetadata,
 )
 
+MLA_ATTENTION_BACKENDS = [
+    "aiter",
+    "flashinfer",
+    "fa3",
+    "fa4",
+    "triton",
+    "flashmla",
+    "cutlass_mla",
+    "trtllm_mla",
+    "ascend",
+]
+
+
+def add_mla_attention_backend(backend_name):
+    if backend_name not in MLA_ATTENTION_BACKENDS:
+        MLA_ATTENTION_BACKENDS.append(backend_name)
+        logger.info(f"Added {backend_name} to MLA_ATTENTION_BACKENDS.")
+
+
 _is_hip = is_hip()
 _is_npu = is_npu()
 _is_cpu_amx_available = cpu_has_amx_support()
@@ -513,17 +532,7 @@ class ModelRunner:
             )
         elif self.use_mla_backend:
             if server_args.device != "cpu":
-                if server_args.attention_backend in [
-                    "aiter",
-                    "flashinfer",
-                    "fa3",
-                    "fa4",
-                    "triton",
-                    "flashmla",
-                    "cutlass_mla",
-                    "trtllm_mla",
-                    "ascend",
-                ]:
+                if server_args.attention_backend in MLA_ATTENTION_BACKENDS:
                     logger.info(
                         f"MLA optimization is turned on. Use {server_args.attention_backend} backend."
                     )