[XPU] Re-add intel xpu on triton paths in diffusion platforms (#36654)

python/sglang/kernels/ops/diffusion/common/platform.py

@@ -31,7 +31,7 @@ _CUDA_LIKE = frozenset({"cuda", "hip"})
 
 
 def platform_key() -> str:
-    """Return the live device family: ``cuda``/``hip``/``npu``/``mps``/``musa``/``cpu``.
+    """Return the live device family: ``cuda``/``hip``/``npu``/``mps``/``musa``/``xpu``/``cpu``.
 
     Deliberately *not* memoized: :func:`select_impl` calls it at module import
     time, and latching that first answer would freeze the choice before the
@@ -40,7 +40,7 @@ def platform_key() -> str:
     """
     from sglang.multimodal_gen.runtime.platforms import current_platform
 
-    for name in ("cuda", "hip", "npu", "mps", "musa"):
+    for name in ("cuda", "hip", "npu", "mps", "musa", "xpu"):
         if getattr(current_platform, f"is_{name}")():
             return name
     return "cpu"

python/sglang/multimodal_gen/runtime/platforms/__init__.py

@@ -201,6 +201,7 @@ def resolve_current_platform_cls_qualname() -> str:
             "mps": "sglang.multimodal_gen.runtime.platforms.mps.MpsPlatform",
             "npu": "sglang.multimodal_gen.runtime.platforms.npu.NPUPlatformBase",
             "musa": "sglang.multimodal_gen.runtime.platforms.musa.MusaPlatform",
+            "xpu": "sglang.multimodal_gen.runtime.platforms.xpu.XpuPlatform",
         }
         qualname = forced_map.get(forced_platform.lower())
         if qualname is None: