only A770 will fallback to fp16

Signed-off-by: Kunshang Ji <kunshang.ji@intel.com>

Author: jikunshang

vllm/platforms/xpu.py

@@ -90,11 +90,6 @@ def check_and_update_config(cls, vllm_config: VllmConfig) -> None:
             if model_config.dtype == torch.bfloat16:
                 bf16_supported = cls.device_support_bf16()
                 if not bf16_supported:
-                    logger.warning(
-                        "bfloat16 is only supported on Intel Data Center GPU, "
-                        "Intel Arc GPU is not supported yet. Your device is %s,"
-                        " which is not supported. will fallback to float16",
-                        cls.get_device_name())
                     model_config.dtype = torch.float16
             if not model_config.enforce_eager:
                 logger.warning(
@@ -162,24 +157,26 @@ def get_current_memory_usage(cls,
     @classmethod
     def device_support_bf16(cls) -> bool:
         device_name = cls.get_device_name().lower()
-        if cls.is_client_gpu():
+        if cls.is_client_gpu_a770():
+            logger.warning("Intel Arc A770 have bfloat16 accuracy known issue,"
+                           " fallback to float16")
             return False
-        elif cls.is_data_center_gpu():
-            return True
         else:
-            logger.warning("Unknown device name %s, always use float16",
-                           device_name)
-            return False
+            logger.info(
+                "Device name %s supports bfloat16. Please file an issue "
+                "if you encounter any accuracy problems with bfloat16.",
+                device_name)
+            return True
 
     @classmethod
     def is_data_center_gpu(cls) -> bool:
         device_name = cls.get_device_name().lower()
         return device_name.count("data center gpu") > 0
 
     @classmethod
-    def is_client_gpu(cls) -> bool:
+    def is_client_gpu_a770(cls) -> bool:
         device_name = cls.get_device_name().lower()
-        return device_name.count("arc") > 0
+        return device_name.count("a770") > 0
 
     @classmethod
     def get_device_communicator_cls(cls) -> str: