diff --git a/vllm/engine/protocol.py b/vllm/engine/protocol.py
index 20b8eb57f743..959a0342817c 100644
--- a/vllm/engine/protocol.py
+++ b/vllm/engine/protocol.py
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
+import enum
 from abc import ABC, abstractmethod
 from collections.abc import AsyncGenerator, Iterable, Mapping
 from typing import Any
@@ -15,13 +16,17 @@ from vllm.pooling_params import PoolingParams
 from vllm.sampling_params import SamplingParams
 from vllm.tasks import SupportedTask
 from vllm.transformers_utils.tokenizer import AnyTokenizer
-from vllm.utils import Device
 from vllm.v1.engine import EngineCoreRequest
 from vllm.v1.engine.processor import Processor
 
 logger = init_logger(__name__)
 
 
+class Device(enum.Enum):
+    GPU = enum.auto()
+    CPU = enum.auto()
+
+
 class EngineClient(ABC):
     """Protocol class for Clients to Engine"""
 
diff --git a/vllm/entrypoints/llm.py b/vllm/entrypoints/llm.py
index c15b70a06809..ce5cf0aae3a3 100644
--- a/vllm/entrypoints/llm.py
+++ b/vllm/entrypoints/llm.py
@@ -31,6 +31,7 @@ from vllm.config.model import (
     TokenizerMode,
 )
 from vllm.engine.arg_utils import EngineArgs
+from vllm.engine.protocol import Device
 from vllm.entrypoints.chat_utils import (
     ChatCompletionMessageParam,
     ChatTemplateContentFormatOption,
@@ -75,8 +76,8 @@ from vllm.transformers_utils.tokenizer import (
     get_cached_tokenizer,
 )
 from vllm.usage.usage_lib import UsageContext
-from vllm.utils import Counter, Device
 from vllm.utils.collection_utils import as_iter, is_list_of
+from vllm.utils.counter import Counter
 from vllm.v1.engine import EngineCoreRequest
 from vllm.v1.engine.llm_engine import LLMEngine
 from vllm.v1.sample.logits_processor import LogitsProcessor
@@ -1490,8 +1491,8 @@ class LLM:
     def stop_profile(self) -> None:
         self.llm_engine.stop_profile()
 
-    def reset_prefix_cache(self, device: Device | None = None) -> bool:
-        return self.llm_engine.reset_prefix_cache(device)
+    def reset_prefix_cache(self, device: Device | None = None) -> None:
+        self.llm_engine.reset_prefix_cache(device)
 
     def sleep(self, level: int = 1):
         """
diff --git a/vllm/entrypoints/openai/api_server.py b/vllm/entrypoints/openai/api_server.py
index 632bd741290b..71939d6c41df 100644
--- a/vllm/entrypoints/openai/api_server.py
+++ b/vllm/entrypoints/openai/api_server.py
@@ -40,7 +40,7 @@ from typing_extensions import assert_never
 import vllm.envs as envs
 from vllm.config import VllmConfig
 from vllm.engine.arg_utils import AsyncEngineArgs
-from vllm.engine.protocol import EngineClient
+from vllm.engine.protocol import Device, EngineClient
 from vllm.entrypoints.launcher import serve_http
 from vllm.entrypoints.logger import RequestLogger
 from vllm.entrypoints.openai.cli_args import make_arg_parser, validate_parsed_serve_args
@@ -108,7 +108,6 @@ from vllm.entrypoints.utils import (
 from vllm.logger import init_logger
 from vllm.reasoning import ReasoningParserManager
 from vllm.usage.usage_lib import UsageContext
-from vllm.utils import Device
 from vllm.utils.argparse_utils import FlexibleArgumentParser
 from vllm.utils.network_utils import is_valid_ipv6_address
 from vllm.utils.system_utils import decorate_logs, set_ulimit
diff --git a/vllm/entrypoints/openai/serving_models.py b/vllm/entrypoints/openai/serving_models.py
index 9b7deb40b93f..24b9587010ca 100644
--- a/vllm/entrypoints/openai/serving_models.py
+++ b/vllm/entrypoints/openai/serving_models.py
@@ -19,7 +19,7 @@ from vllm.entrypoints.openai.protocol import (
 from vllm.logger import init_logger
 from vllm.lora.request import LoRARequest
 from vllm.lora.resolver import LoRAResolver, LoRAResolverRegistry
-from vllm.utils import AtomicCounter
+from vllm.utils.counter import AtomicCounter
 
 logger = init_logger(__name__)
 
diff --git a/vllm/utils/__init__.py b/vllm/utils/__init__.py
index eaa78839cf3f..549827a927d9 100644
--- a/vllm/utils/__init__.py
+++ b/vllm/utils/__init__.py
@@ -3,7 +3,6 @@
 
 import enum
 import inspect
-import threading
 import uuid
 import warnings
 from functools import wraps
@@ -68,54 +67,11 @@ STR_INVALID_VAL: str = "INVALID"
 T = TypeVar("T")
 
 
-class Device(enum.Enum):
-    GPU = enum.auto()
-    CPU = enum.auto()
-
-
 class LayerBlockType(enum.Enum):
     attention = "attention"
     mamba = "mamba"
 
 
-class Counter:
-    def __init__(self, start: int = 0) -> None:
-        self.counter = start
-
-    def __next__(self) -> int:
-        i = self.counter
-        self.counter += 1
-        return i
-
-    def reset(self) -> None:
-        self.counter = 0
-
-
-class AtomicCounter:
-    """An atomic, thread-safe counter"""
-
-    def __init__(self, initial=0):
-        """Initialize a new atomic counter to given initial value"""
-        self._value = initial
-        self._lock = threading.Lock()
-
-    def inc(self, num=1):
-        """Atomically increment the counter by num and return the new value"""
-        with self._lock:
-            self._value += num
-            return self._value
-
-    def dec(self, num=1):
-        """Atomically decrement the counter by num and return the new value"""
-        with self._lock:
-            self._value -= num
-            return self._value
-
-    @property
-    def value(self):
-        return self._value
-
-
 def random_uuid() -> str:
     return str(uuid.uuid4().hex)
 
diff --git a/vllm/utils/counter.py b/vllm/utils/counter.py
new file mode 100644
index 000000000000..c2dce32e97e1
--- /dev/null
+++ b/vllm/utils/counter.py
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+import threading
+
+
+class Counter:
+    def __init__(self, start: int = 0) -> None:
+        super().__init__()
+
+        self.counter = start
+
+    def __next__(self) -> int:
+        i = self.counter
+        self.counter += 1
+        return i
+
+    def reset(self) -> None:
+        self.counter = 0
+
+
+class AtomicCounter:
+    """An atomic, thread-safe counter"""
+
+    def __init__(self, initial: int = 0) -> None:
+        """Initialize a new atomic counter to given initial value"""
+        super().__init__()
+
+        self._value = initial
+        self._lock = threading.Lock()
+
+    @property
+    def value(self) -> int:
+        return self._value
+
+    def inc(self, num: int = 1) -> int:
+        """Atomically increment the counter by num and return the new value"""
+        with self._lock:
+            self._value += num
+            return self._value
+
+    def dec(self, num: int = 1) -> int:
+        """Atomically decrement the counter by num and return the new value"""
+        with self._lock:
+            self._value -= num
+            return self._value
diff --git a/vllm/v1/engine/async_llm.py b/vllm/v1/engine/async_llm.py
index fd0a9b395e5f..cf458a8f074c 100644
--- a/vllm/v1/engine/async_llm.py
+++ b/vllm/v1/engine/async_llm.py
@@ -14,7 +14,7 @@ import torch
 import vllm.envs as envs
 from vllm.config import VllmConfig
 from vllm.engine.arg_utils import AsyncEngineArgs
-from vllm.engine.protocol import EngineClient
+from vllm.engine.protocol import Device, EngineClient
 from vllm.entrypoints.utils import _validate_truncation_size
 from vllm.inputs import PromptType
 from vllm.logger import init_logger
@@ -29,7 +29,6 @@ from vllm.tracing import init_tracer
 from vllm.transformers_utils.config import maybe_register_config_serialize_by_value
 from vllm.transformers_utils.tokenizer import AnyTokenizer, init_tokenizer_from_configs
 from vllm.usage.usage_lib import UsageContext
-from vllm.utils import Device
 from vllm.utils.async_utils import cancel_task_threadsafe
 from vllm.utils.collection_utils import as_list
 from vllm.utils.func_utils import deprecate_kwargs
diff --git a/vllm/v1/engine/llm_engine.py b/vllm/v1/engine/llm_engine.py
index 9d69ed93ed37..0cd5e1ff3944 100644
--- a/vllm/v1/engine/llm_engine.py
+++ b/vllm/v1/engine/llm_engine.py
@@ -14,6 +14,7 @@ from vllm.config import ParallelConfig, VllmConfig
 from vllm.distributed import stateless_destroy_torch_distributed_process_group
 from vllm.distributed.parallel_state import get_dp_group
 from vllm.engine.arg_utils import EngineArgs
+from vllm.engine.protocol import Device
 from vllm.inputs import PromptType
 from vllm.logger import init_logger
 from vllm.lora.request import LoRARequest
@@ -26,7 +27,6 @@ from vllm.tasks import SupportedTask
 from vllm.tracing import init_tracer
 from vllm.transformers_utils.tokenizer import AnyTokenizer, init_tokenizer_from_configs
 from vllm.usage.usage_lib import UsageContext
-from vllm.utils import Device
 from vllm.v1.engine import EngineCoreRequest
 from vllm.v1.engine.core_client import EngineCoreClient
 from vllm.v1.engine.output_processor import OutputProcessor