refactor: abstract graph mode support into platform interface (#25161)

Signed-off-by: Yizhou Liu <liu_yizhou@outlook.com>

vllm/config/__init__.py

@@ -503,7 +503,7 @@ class VllmConfig:
         if self.compilation_config.pass_config.enable_sequence_parallelism:
             self.compilation_config.custom_ops.append("+rms_norm")
 
-        if current_platform.is_cuda_alike() or current_platform.is_xpu():
+        if current_platform.support_static_graph_mode():
             # if cudagraph_mode is not explicitly set by users, set default
             # value
             if self.compilation_config.cudagraph_mode is None:

vllm/platforms/cuda.py

@@ -498,6 +498,10 @@ class CudaPlatformBase(Platform):
     def support_hybrid_kv_cache(cls) -> bool:
         return True
 
+    @classmethod
+    def support_static_graph_mode(cls) -> bool:
+        return True
+
 
 # NVML utils
 # Note that NVML is not affected by `CUDA_VISIBLE_DEVICES`,

vllm/platforms/interface.py

@@ -587,6 +587,13 @@ class Platform:
         """
         return False
 
+    @classmethod
+    def support_static_graph_mode(cls) -> bool:
+        """
+        Returns if the graph mode is supported by the current platform.
+        """
+        return False
+
     @classmethod
     def use_sync_weight_loader(cls) -> bool:
         """

vllm/platforms/rocm.py

@@ -477,3 +477,7 @@ class RocmPlatform(Platform):
     @classmethod
     def support_hybrid_kv_cache(cls) -> bool:
         return True
+
+    @classmethod
+    def support_static_graph_mode(cls) -> bool:
+        return True

vllm/platforms/xpu.py

@@ -113,12 +113,9 @@ class XPUPlatform(Platform):
         # lazy import to avoid circular import
         from vllm.config import CompilationLevel, CUDAGraphMode
         compilation_config = vllm_config.compilation_config
-        if compilation_config.cudagraph_mode is None or \
-                compilation_config.cudagraph_mode.max_cudagraph_mode() \
-                    != CUDAGraphMode.NONE:
-            logger.info("[XPU] CUDA graph is not supported on XPU, disabling "
-                        "cudagraphs. Fallback to cudagraph_mode=NONE")
-            compilation_config.cudagraph_mode = CUDAGraphMode.NONE
+
+        assert compilation_config.cudagraph_mode == CUDAGraphMode.NONE, \
+            "CUDA graph mode should be NONE on XPU"
 
         if vllm_config.lora_config is not None:
             compilation_config.level = CompilationLevel.NO_COMPILATION
@@ -169,6 +166,10 @@ class XPUPlatform(Platform):
     def support_hybrid_kv_cache(cls) -> bool:
         return True
 
+    @classmethod
+    def support_static_graph_mode(cls) -> bool:
+        return False
+
     @classmethod
     def is_pin_memory_available(cls):
         return True