feat: add add_chunked_prefix_cache_attention_backend (#11636)

python/sglang/srt/model_executor/model_runner.py

@@ -190,6 +190,14 @@ def add_mla_attention_backend(backend_name):
         logger.info(f"Added {backend_name} to MLA_ATTENTION_BACKENDS.")
 
 
+def add_chunked_prefix_cache_attention_backend(backend_name):
+    if backend_name not in CHUNKED_PREFIX_CACHE_SUPPORTED_ATTENTION_BACKENDS:
+        CHUNKED_PREFIX_CACHE_SUPPORTED_ATTENTION_BACKENDS.append(backend_name)
+        logger.info(
+            f"Added {backend_name} to CHUNKED_PREFIX_CACHE_SUPPORTED_ATTENTION_BACKENDS."
+        )
+
+
 _is_hip = is_hip()
 _is_npu = is_npu()
 _is_cpu_amx_available = cpu_has_amx_support()