[Kernel] unified_attention for Attention.forward (vllm-project#11967)

heheda12345 · Isotr0py · commit e7d2de40f113 · 2025-02-02T21:35:01.000+08:00
Signed-off-by: Chen Zhang &lt;zhangch99@outlook.com&gt;
Signed-off-by: Isotr0py &lt;2037008807@qq.com&gt;
diff --git a/vllm/attention/layer.py b/vllm/attention/layer.py
@@ -134,15 +134,10 @@ def forward(
         query: torch.Tensor,
         key: torch.Tensor,
         value: torch.Tensor,
-        kv_cache: torch.Tensor,
-        attn_metadata: AttentionMetadata,
+        _kv_cache: torch.Tensor,
+        _attn_metadata: AttentionMetadata,
     ) -> torch.Tensor:
-
-        if self.use_direct_call:
-            return self.impl.forward(query, key, value, kv_cache,
-                                     attn_metadata, self._k_scale,
-                                     self._v_scale)
-        elif self.use_output:
+        if self.use_output:
             output = torch.empty_like(query)
             hidden_size = query.size(-1)
             # Reshape the query, key, and value tensors.
@@ -154,12 +149,19 @@ def forward(
                 key = key.view(-1, self.num_kv_heads, self.head_size)
             if value is not None:
                 value = value.view(-1, self.num_kv_heads, self.head_size)
-            torch.ops.vllm.unified_attention_with_output(
-                query, key, value, output, self.layer_name)
+            if self.use_direct_call:
+                unified_attention_with_output(query, key, value, output,
+                                              self.layer_name)
+            else:
+                torch.ops.vllm.unified_attention_with_output(
+                    query, key, value, output, self.layer_name)
             return output.view(-1, hidden_size)
         else:
-            return torch.ops.vllm.unified_attention(query, key, value,
-                                                    self.layer_name)
+            if self.use_direct_call:
+                return unified_attention(query, key, value, self.layer_name)
+            else:
+                return torch.ops.vllm.unified_attention(
+                    query, key, value, self.layer_name)
 
     def extra_repr(self) -> str:
         s = f"head_size={self.impl.head_size}"  # type: ignore
diff --git a/vllm/utils.py b/vllm/utils.py
@@ -2171,5 +2171,4 @@ def bind_kv_cache(
         forward_ctx = ctx[layer_name]
         assert len(forward_ctx.kv_cache) == len(kv_cache)
         for ve, ve_kv_cache in enumerate(kv_cache):
-            assert forward_ctx.kv_cache[ve].numel() == 0
             forward_ctx.kv_cache[ve] = ve_kv_cache[kv_cache_idx]
diff --git a/vllm/worker/hpu_model_runner.py b/vllm/worker/hpu_model_runner.py
@@ -28,6 +28,7 @@
 from vllm.attention import AttentionMetadata, get_attn_backend
 from vllm.config import DeviceConfig, VllmConfig
 from vllm.distributed.parallel_state import get_world_group
+from vllm.forward_context import set_forward_context
 from vllm.logger import init_logger
 from vllm.lora.layers import LoRAMapping
 from vllm.lora.request import LoRARequest
@@ -40,7 +41,8 @@
 from vllm.sampling_params import SamplingParams
 from vllm.sequence import (IntermediateTensors, SequenceData,
                            SequenceGroupMetadata)
-from vllm.utils import is_pin_memory_available, make_tensor_with_pad
+from vllm.utils import (bind_kv_cache, is_pin_memory_available,
+                        make_tensor_with_pad)
 from vllm.worker.model_runner_base import (
     ModelRunnerBase, ModelRunnerInputBase,
     _add_attn_metadata_broadcastable_dict,
@@ -1286,6 +1288,9 @@ def create_dummy_seq_group_metadata(self,
     def profile_run(self) -> None:
         num_layers = self.model_config.get_num_layers(self.parallel_config)
         kv_caches = [None] * num_layers
+        bind_kv_cache(
+            self.vllm_config.compilation_config.static_forward_context,
+            [kv_caches])
         max_seq_len = self.bucketing_global_state.prompt_seq_bucket_cfg[-1]
         max_batch_size = min(self.max_num_batched_tokens // max_seq_len,
                              self.scheduler_config.max_num_seqs)
@@ -1943,7 +1948,11 @@ def execute_model(
                                 f"graphs{'T' if use_graphs else 'F'}")
         else:
             model_event_name = 'model_executable'
-        with self.profiler.record_event('internal', model_event_name):
+        with set_forward_context(
+                model_input.attn_metadata, self.vllm_config,
+                model_input.virtual_engine), \
+            self.profiler.record_event(
+                    'internal', model_event_name):
             hidden_states = self.model.forward(
                 **execute_model_kwargs,
                 selected_token_indices=sampling_metadata.selected_token_indices
diff --git a/vllm/worker/hpu_worker.py b/vllm/worker/hpu_worker.py
@@ -20,6 +20,7 @@
 from vllm.model_executor import set_random_seed
 from vllm.prompt_adapter.request import PromptAdapterRequest
 from vllm.sequence import ExecuteModelRequest
+from vllm.utils import bind_kv_cache
 from vllm.worker.cache_engine import CacheEngine
 from vllm.worker.hpu_model_runner import HPUModelRunner
 from vllm.worker.model_runner_base import ModelRunnerBase
@@ -215,6 +216,8 @@ def _init_cache_engine(self):
             self.cache_engine[ve].gpu_cache
             for ve in range(self.parallel_config.pipeline_parallel_size)
         ]
+        bind_kv_cache(self.compilation_config.static_forward_context,
+                      self.hpu_cache)
 
     def _warm_up_model(self) -> None:
         # NOTE(kzawora): We should use virtual engine index here
diff --git a/vllm/worker/neuron_model_runner.py b/vllm/worker/neuron_model_runner.py
@@ -8,6 +8,7 @@
 from transformers_neuronx.config import GenerationConfig
 
 from vllm.config import VllmConfig
+from vllm.forward_context import set_forward_context
 from vllm.logger import init_logger
 from vllm.model_executor import SamplingMetadata
 from vllm.model_executor.layers.sampler import SamplerOutput
@@ -314,13 +315,15 @@ def execute_model(
             raise ValueError(
                 "NeuronModelRunner does not support multi-step execution.")
 
-        hidden_states = self.model(
-            input_ids=model_input.input_tokens,
-            positions=model_input.input_positions,
-            input_block_ids=model_input.input_block_ids,
-            **MultiModalKwargs.as_kwargs(model_input.multi_modal_kwargs or {},
-                                         device=self.device),
-        )
+        with set_forward_context(None, self.vllm_config, 0):
+            hidden_states = self.model(
+                input_ids=model_input.input_tokens,
+                positions=model_input.input_positions,
+                input_block_ids=model_input.input_block_ids,
+                **MultiModalKwargs.as_kwargs(model_input.multi_modal_kwargs
+                                             or {},
+                                             device=self.device),
+            )
 
         # Compute the logits only if the on-device sampling is turned off as
         # on-device sampling outputs the token ids.
diff --git a/vllm/worker/openvino_model_runner.py b/vllm/worker/openvino_model_runner.py
@@ -8,6 +8,7 @@
 from vllm.attention import get_attn_backend
 from vllm.attention.backends.openvino import OpenVINOAttentionMetadata
 from vllm.config import VllmConfig
+from vllm.forward_context import set_forward_context
 from vllm.logger import init_logger
 from vllm.model_executor import SamplingMetadata
 from vllm.model_executor.layers.sampler import SamplerOutput
@@ -350,7 +351,8 @@ def execute_model(
                                          device=self.device),
         }
 
-        hidden_states = model_executable(**execute_model_kwargs)
+        with set_forward_context(attn_metadata, self.vllm_config, 0):
+            hidden_states = model_executable(**execute_model_kwargs)
 
         # Compute the logits.
         logits = self.model.compute_logits(hidden_states, sampling_metadata)
diff --git a/vllm/worker/openvino_worker.py b/vllm/worker/openvino_worker.py
@@ -20,6 +20,7 @@
 from vllm.platforms import current_platform
 from vllm.sampling_params import SamplingParams
 from vllm.sequence import ExecuteModelRequest, SequenceGroupMetadata
+from vllm.utils import bind_kv_cache
 from vllm.worker.openvino_model_runner import OpenVINOModelRunner
 from vllm.worker.worker_base import LoraNotSupportedWorkerBase, WorkerBase
 
@@ -339,6 +340,8 @@ def _init_cache_engine(self) -> None:
             ov_device,
         )
         self.kv_cache = self.cache_engine.kv_cache
+        bind_kv_cache(self.compilation_config.static_forward_context,
+                      [self.kv_cache])
         self.model_runner.block_size = self.cache_engine.block_size
 
         assert self.kv_cache is not None
@@ -507,12 +510,18 @@ def model_profile_run():
 
             self.model_runner.block_size = tmp_cache_config.block_size
 
+            bind_kv_cache(self.compilation_config.static_forward_context,
+                          profiling_cache_engine.kv_cache)
             # Run the model with the dummy inputs.
             self.model_runner.execute_model(seqs,
                                             profiling_cache_engine.kv_cache)
 
-            # explicitly delete temporary KV cache manager to free KV cache
-            # when real inputs will be passed to OV
+            # Explicitly revert bind_kv_cache and delete temporary KV cache
+            # manager to free KV cache when real inputs will be passed to OV
+            bind_kv_cache(self.compilation_config.static_forward_context, [[
+                torch.tensor([])
+                for _ in range(len(profiling_cache_engine.kv_cache))
+            ]])
             del profiling_cache_engine
 
             logger.info(
diff --git a/vllm/worker/tpu_model_runner.py b/vllm/worker/tpu_model_runner.py
@@ -13,6 +13,7 @@
 
 from vllm.attention import AttentionMetadata, get_attn_backend
 from vllm.config import VllmConfig
+from vllm.forward_context import set_forward_context
 from vllm.logger import init_logger
 from vllm.model_executor.layers.sampler import SamplerOutput
 from vllm.model_executor.model_loader import get_model
@@ -265,8 +266,9 @@ def _dummy_run(
             torch._dynamo.mark_dynamic(t, 0)
             torch._dynamo.mark_dynamic(p, 0)
         # Dummy run.
-        self.model(token_ids, position_ids, attn_metadata, input_lens, t, p,
-                   num_samples, kv_caches)
+        with set_forward_context(attn_metadata, self.vllm_config, 0):
+            self.model(token_ids, position_ids, attn_metadata, input_lens, t,
+                       p, num_samples, kv_caches)
 
     def warmup_model(
         self,
@@ -663,10 +665,13 @@ def execute_model(
                 input_lens = model_input.input_lens[i:i + 1].to(self.device)
                 t = model_input.t[i:i + 1].to(self.device)
                 p = model_input.p[i:i + 1].to(self.device)
-                output_token_ids = self.model(token_ids, position_ids,
-                                              attn_metadata, input_lens, t, p,
-                                              model_input.num_samples,
-                                              kv_caches)
+                with set_forward_context(model_input.attn_metadata,
+                                         self.vllm_config,
+                                         model_input.virtual_engine):
+                    output_token_ids = self.model(token_ids, position_ids,
+                                                  attn_metadata, input_lens, t,
+                                                  p, model_input.num_samples,
+                                                  kv_caches)
                 next_token_ids.append(output_token_ids[0])
                 start_idx = end_idx
 
@@ -711,10 +716,13 @@ def execute_model(
             input_lens = model_input.input_lens.to(self.device)
             for i in range(num_steps):
                 slot_mapping = attn_metadata.slot_mapping
-                output_token_ids = self.model(token_ids, position_ids,
-                                              attn_metadata, input_lens, t, p,
-                                              model_input.num_samples,
-                                              kv_caches)
+                with set_forward_context(model_input.attn_metadata,
+                                         self.vllm_config,
+                                         model_input.virtual_engine):
+                    output_token_ids = self.model(token_ids, position_ids,
+                                                  attn_metadata, input_lens, t,
+                                                  p, model_input.num_samples,
+                                                  kv_caches)
                 self.cached_step_outputs.append(output_token_ids)
 
                 if i < num_steps - 1:
diff --git a/vllm/worker/tpu_worker.py b/vllm/worker/tpu_worker.py
@@ -12,7 +12,7 @@
 from vllm.logger import init_logger
 from vllm.model_executor import set_random_seed
 from vllm.sequence import ExecuteModelRequest
-from vllm.utils import STR_DTYPE_TO_TORCH_DTYPE, get_dtype_size
+from vllm.utils import STR_DTYPE_TO_TORCH_DTYPE, bind_kv_cache, get_dtype_size
 from vllm.worker.tpu_model_runner import ExecutionMode, TPUModelRunner
 from vllm.worker.worker_base import (LocalOrDistributedWorkerBase,
                                      LoraNotSupportedWorkerBase, WorkerBase,
@@ -108,6 +108,8 @@ def determine_num_available_blocks(self) -> Tuple[int, int]:
                       torch.tensor([], dtype=torch.float32,
                                    device=self.device))
                      for _ in range(num_layers)]
+        bind_kv_cache(self.compilation_config.static_forward_context,
+                      [kv_caches])
         self.model_runner._dummy_run(
             batch_size=1,
             seq_len=self.scheduler_config.max_num_batched_tokens,
@@ -170,6 +172,8 @@ def initialize_cache(
                                       device="cpu")
             cpu_v_cache = torch.zeros_like(cpu_k_cache)
             self.cpu_cache.append((cpu_k_cache, cpu_v_cache))
+        bind_kv_cache(self.compilation_config.static_forward_context,
+                      [self.tpu_cache])
         self._warmup_model()
 
     def _warmup_model(self) -> None:
diff --git a/vllm/worker/xpu_model_runner.py b/vllm/worker/xpu_model_runner.py
@@ -12,6 +12,7 @@
 from vllm.attention import get_attn_backend
 from vllm.config import VllmConfig
 from vllm.distributed import get_pp_group
+from vllm.forward_context import set_forward_context
 from vllm.inputs import INPUT_REGISTRY, InputRegistry
 from vllm.logger import init_logger
 from vllm.model_executor import SamplingMetadataCache
@@ -562,15 +563,17 @@ def execute_model(
         if (self.observability_config is not None
                 and self.observability_config.collect_model_forward_time):
             model_forward_start_time = time.time()
-
-        hidden_or_intermediate_states = model_executable(
-            input_ids=model_input.input_tokens,
-            positions=model_input.input_positions,
-            kv_caches=kv_caches,
-            attn_metadata=model_input.attn_metadata,
-            intermediate_tensors=intermediate_tensors,
-            **MultiModalKwargs.as_kwargs(model_input.multi_modal_kwargs or {},
-                                         device=self.device))
+        with set_forward_context(model_input.attn_metadata, self.vllm_config,
+                                 model_input.virtual_engine):
+            hidden_or_intermediate_states = model_executable(
+                input_ids=model_input.input_tokens,
+                positions=model_input.input_positions,
+                kv_caches=kv_caches,
+                attn_metadata=model_input.attn_metadata,
+                intermediate_tensors=intermediate_tensors,
+                **MultiModalKwargs.as_kwargs(model_input.multi_modal_kwargs
+                                             or {},
+                                             device=self.device))
         # Compute the logits in the last pipeline stage.
         if not get_pp_group().is_last_rank:
             return hidden_or_intermediate_states
