replace `with torch.cuda.device` with `with torch.accelerator.device_index` (#36144)

Signed-off-by: Yan Ma <yan.ma@intel.com>

benchmarks/kernels/benchmark_moe.py

@@ -626,7 +626,11 @@ class BenchmarkWorker:
             if visible_device != f"{self.device_id}":
                 need_device_guard = True
 
-        with torch.cuda.device(self.device_id) if need_device_guard else nullcontext():
+        with (
+            torch.accelerator.device_index(self.device_id)
+            if need_device_guard
+            else nullcontext()
+        ):
             for idx, config in enumerate(tqdm(search_space)):
                 try:
                     kernel_time = benchmark_config(

tools/pre_commit/check_torch_cuda.py

@@ -8,8 +8,8 @@ import regex as re
 # Regex: match `torch.cuda.xxx` but allow `torch.accelerator.xxx`
 # --------------------------------------------------------------------------- #
 _TORCH_CUDA_PATTERNS = [
-    r"\btorch\.cuda\.empty_cache\b",
-    r"\btorch\.cuda\.synchronize\b",
+    r"\btorch\.cuda\.(empty_cache|synchronize|device\()\b",
+    r"\bwith\btorch\.cuda\.device\b",
 ]
 
 ALLOWED_FILES = {"vllm/platforms/", "vllm/device_allocator/"}

vllm/distributed/device_communicators/pynccl.py

@@ -133,9 +133,7 @@ class PyNcclCommunicator:
         assert isinstance(device, torch.device)
         self.device = device
         # nccl communicator and stream will use this device
-        # `torch.cuda.device` is a context manager that changes the
-        # current cuda device to the specified one
-        with torch.cuda.device(device):
+        with torch.accelerator.device_index(device.index):
             self.comm: ncclComm_t = self.nccl.ncclCommInitRank(
                 self.world_size, self.unique_id, self.rank
             )

vllm/distributed/kv_transfer/kv_connector/v1/p2p/p2p_nccl_engine.py

@@ -218,7 +218,7 @@ class P2pNcclEngine:
             data = {"cmd": "NEW", "unique_id": bytes(unique_id.internal)}
             sock.send(msgpack.dumps(data))
 
-            with torch.cuda.device(self.device):
+            with torch.accelerator.device_index(self.device.index):
                 rank = 0
                 with set_p2p_nccl_context(self.nccl_num_channels):
                     comm: ncclComm_t = self.nccl.ncclCommInitRank(2, unique_id, rank)
@@ -377,7 +377,7 @@ class P2pNcclEngine:
             data = msgpack.loads(message)
             if data["cmd"] == "NEW":
                 unique_id = self.nccl.unique_id_from_bytes(bytes(data["unique_id"]))
-                with torch.cuda.device(self.device):
+                with torch.accelerator.device_index(self.device.index):
                     rank = 1
                     with set_p2p_nccl_context(self.nccl_num_channels):
                         comm: ncclComm_t = self.nccl.ncclCommInitRank(

vllm/model_executor/layers/fla/ops/utils.py

@@ -105,7 +105,7 @@ def input_guard(fn: Callable[..., torch.Tensor]) -> Callable[..., torch.Tensor]:
                     break
 
         if tensor is not None:
-            ctx = torch.cuda.device(tensor.device.index)
+            ctx = torch.accelerator.device_index(tensor.device.index)
         else:
             ctx = contextlib.nullcontext()
 

vllm/model_executor/layers/mamba/ops/layernorm_gated.py

@@ -119,7 +119,7 @@ def _layer_norm_fwd(
     # heuristics for number of warps
     num_warps = min(max(BLOCK_N // 256, 1), 8)
     grid = (M, ngroups)
-    with torch.cuda.device(x.device.index):
+    with torch.accelerator.device_index(x.device.index):
         _layer_norm_fwd_1pass_kernel[grid](
             x,
             out,

vllm/model_executor/layers/mamba/ops/mamba_ssm.py

@@ -419,7 +419,7 @@ def selective_state_update(
         and dt.stride(-1) == 0
         and dt_bias.stride(-1) == 0
     )
-    with torch.cuda.device(x.device.index):
+    with torch.accelerator.device_index(x.device.index):
         _selective_scan_update_kernel[grid](
             state,
             x,

vllm/model_executor/layers/mamba/ops/ssd_bmm.py

@@ -185,7 +185,7 @@ def _bmm_chunk_fwd(a, b, chunk_size, cu_chunk_seqlens, causal=False, output_dtyp
         * triton.cdiv(chunk_size, META["BLOCK_SIZE_N"]),
         nchunks * ngroups,
     )
-    with torch.cuda.device(a.device.index):
+    with torch.accelerator.device_index(a.device.index):
         _bmm_chunk_fwd_kernel[grid](
             a_ptr=a,
             b_ptr=b,

vllm/model_executor/layers/mamba/ops/ssd_chunk_state.py

@@ -323,7 +323,7 @@ def _chunk_cumsum_fwd(
         nheads, nchunks, chunk_size, device=dt.device, dtype=torch.float32
     )
     grid_chunk_cs = lambda META: (nchunks, triton.cdiv(nheads, META["BLOCK_SIZE_H"]))
-    with torch.cuda.device(dt.device.index):
+    with torch.accelerator.device_index(dt.device.index):
         _chunk_cumsum_fwd_kernel[grid_chunk_cs](
             dt_ptr=dt,
             A_ptr=A,
@@ -378,7 +378,7 @@ def _chunk_state_fwd(
         nchunks,
         nheads,
     )
-    with torch.cuda.device(x.device.index):
+    with torch.accelerator.device_index(x.device.index):
         _chunk_state_fwd_kernel[grid](
             x_ptr=x,
             b_ptr=B,

vllm/model_executor/layers/mamba/ops/ssd_state_passing.py

@@ -120,7 +120,7 @@ def _state_passing_fwd(
     )
 
     grid = lambda META: (triton.cdiv(dim, META["BLOCK_SIZE"]), batch, nheads)
-    with torch.cuda.device(states.device.index):
+    with torch.accelerator.device_index(states.device.index):
         _state_passing_fwd_kernel[grid](
             states_ptr=states,
             out_ptr=out,