[platforms] absorb worker cls difference into platforms folder (#10555)

Signed-off-by: youkaichao <youkaichao@gmail.com>
Co-authored-by: Nick Hill <nhill@redhat.com>

vllm/platforms/hpu.py

@@ -1,7 +1,14 @@
+from typing import TYPE_CHECKING
+
 import torch
 
 from .interface import Platform, PlatformEnum, _Backend
 
+if TYPE_CHECKING:
+    from vllm.config import VllmConfig
+else:
+    VllmConfig = None
+
 
 class HpuPlatform(Platform):
     _enum = PlatformEnum.HPU
@@ -14,3 +21,19 @@ class HpuPlatform(Platform):
     @staticmethod
     def inference_mode():
         return torch.no_grad()
+
+    @classmethod
+    def check_and_update_config(cls, vllm_config: VllmConfig) -> None:
+
+        scheduler_config = vllm_config.scheduler_config
+        if scheduler_config.is_multi_step:
+            raise NotImplementedError(
+                "Multi-step execution is not implemented for HPU")
+
+        if vllm_config.speculative_config is not None:
+            raise NotImplementedError(
+                "Speculative decoding is not implemented for HPU")
+
+        parallel_config = vllm_config.parallel_config
+        if parallel_config.worker_cls == "auto":
+            parallel_config.worker_cls = "vllm.worker.hpu_worker.HPUWorker"