[Fix][ROCm] Enforce eager for all encoder-decoder models on ROCm (#18154)

Signed-off-by: Luka Govedič <lgovedic@redhat.com>

vllm/config.py

@@ -906,12 +906,17 @@ class ModelConfig:
     def _verify_cuda_graph(self) -> None:
         self.max_seq_len_to_capture = min(self.max_seq_len_to_capture,
                                           self.max_model_len)
+        # CUDAGraph capture not supported for enc-dec models and mllama on ROCm
         ROCM_UNSUPPORTED_MODELS = ['mllama']
-        if (self.hf_config.model_type in ROCM_UNSUPPORTED_MODELS
-                and not self.enforce_eager and current_platform.is_rocm()):
+        unsupported_rocm = (self.hf_config.model_type
+                            in ROCM_UNSUPPORTED_MODELS
+                            or self.is_encoder_decoder)
+
+        if (unsupported_rocm and not self.enforce_eager
+                and current_platform.is_rocm()):
             logger.warning(
                 "CUDA graph is not supported for %s on ROCm yet, fallback "
-                "to the eager mode.", self.hf_config.model_type)
+                "to eager mode.", self.hf_config.model_type)
             self.enforce_eager = True
 
     def _verify_bnb_config(self) -> None: