add VLLM_USE_FUSED_FILL_RMS_CAT for dpsk mtp fill + rms*2 + cat

update VLLM_USE_LIGHTOP_RMS_ROPE_CONCAT impl

vllm/attention/layer.py

@@ -553,18 +553,7 @@ def unified_attention_with_output(
         maybe_save_kv_layer_to_connector(layer_name, kv_cache)
 
 
-if not envs.VLLM_USE_LIGHTOP_RMS_ROPE_CONCAT:
-    def unified_attention_with_output_fake(
-        query: torch.Tensor,
-        key: torch.Tensor,
-        value: torch.Tensor,
-        output: torch.Tensor,
-        layer_name: str,
-        output_scale: Optional[torch.Tensor] = None,
-    ) -> None:
-        return
-else:
-    def unified_attention_with_output_fake(
+def unified_attention_with_output_fake(
     query: torch.Tensor,
     key: torch.Tensor,
     value: torch.Tensor,

vllm/envs.py

@@ -196,6 +196,7 @@ if TYPE_CHECKING:
     VLLM_USE_LIGHTOP_RMS_ROPE_CONCAT: bool = False
     VLLM_USE_FUSED_RMS_ROPE: bool = False
     VLLM_USE_MARLIN_W16A16_MOE:bool = False
+    VLLM_USE_FUSED_FILL_RMS_CAT:bool = False
 
 def get_default_cache_root():
     return os.getenv(
@@ -1275,7 +1276,10 @@ environment_variables: dict[str, Callable[[], Any]] = {
     "VLLM_USE_MARLIN_W16A16_MOE":
         lambda: (os.environ.get("VLLM_USE_MARLIN_W16A16_MOE", "False").lower() in
                  ("true", "1")),
-        
+    # vLLM will use lightop for dpsk mtp fill + rms*2 + cat
+    "VLLM_USE_FUSED_FILL_RMS_CAT":
+        lambda: (os.environ.get("VLLM_USE_FUSED_FILL_RMS_CAT", "False").lower() in
+                 ("true", "1")),  
 }
 
 # --8<-- [end:env-vars-definition]

vllm/model_executor/model_loader/utils.py

@@ -253,8 +253,6 @@ def get_model_architecture(
                     os.environ['VLLM_USE_OPT_CAT'] = '1'
                 if not envs.is_set("VLLM_USE_CAT_MLA"):
                     os.environ['VLLM_USE_CAT_MLA'] = '1'
-                # if not envs.is_set("VLLM_REJECT_SAMPLE_OPT"):
-                #     os.environ['VLLM_REJECT_SAMPLE_OPT'] = '1'
                 if not envs.is_set("VLLM_USE_LIGHTOP_RMS_ROPE_CONCAT"):
                     os.environ['VLLM_USE_LIGHTOP_RMS_ROPE_CONCAT'] = '1'
                 if not envs.is_set("VLLM_SCHED_ENABLE_MINIMAL_INJECTION"):
@@ -298,8 +296,6 @@ def get_model_architecture(
                     os.environ['VLLM_USE_OPT_CAT'] = '1'
                 if not envs.is_set("VLLM_USE_CAT_MLA"):
                     os.environ['VLLM_USE_CAT_MLA'] = '1'
-                # if not envs.is_set("VLLM_REJECT_SAMPLE_OPT"):
-                #     os.environ['VLLM_REJECT_SAMPLE_OPT'] = '1'
                 if not envs.is_set("VLLM_USE_LIGHTOP_RMS_ROPE_CONCAT"):
                     os.environ['VLLM_USE_LIGHTOP_RMS_ROPE_CONCAT'] = '1'
                 if not envs.is_set("VLLM_SCHED_ENABLE_MINIMAL_INJECTION"):

vllm/model_executor/models/deepseek_mtp.py

@@ -28,6 +28,9 @@ from .interfaces import SupportsPP
 from .utils import maybe_prefix
 from vllm import _custom_ops as ops
 from vllm.model_executor.layers.quantization.blockwise_int8 import BlockInt8Config
+import vllm.envs as envs
+from lightop import fuse_fill_rms_x2_concat
+
 
 
 class SharedHead(nn.Module):
@@ -84,10 +87,14 @@ class DeepSeekMultiTokenPredictorLayer(nn.Module):
             inputs_embeds = self.embed_tokens(input_ids)
         assert inputs_embeds is not None
         # masking inputs at position 0, as not needed by MTP
+        if envs.VLLM_USE_FUSED_FILL_RMS_CAT:
+            hidden_states_fuse = torch.empty(hidden_states.shape[0], hidden_states.shaope[1]*2, device=hidden_states.device, dtype=hidden_states.dtype)
+            fuse_fill_rms_x2_concat(hidden_states_fuse, positions, inputs_embeds, previous_hidden_states, self.enorm.weight, self.hnorm.weight, self.enorm.variance_epsilon)
+            hidden_states = self.eh_proj(hidden_states_fuse)
+        else:
             inputs_embeds[positions == 0] = 0
             inputs_embeds = self.enorm(inputs_embeds)
             previous_hidden_states = self.hnorm(previous_hidden_states)
-
             hidden_states = self.eh_proj(
                 torch.cat([inputs_embeds, previous_hidden_states], dim=-1))
 

vllm/v1/attention/backends/mla/common.py

@@ -217,6 +217,7 @@ from vllm.v1.attention.backends.utils import (AttentionMetadataBuilder,
                                               CommonAttentionMetadata)
 from vllm.v1.kv_cache_interface import AttentionSpec
 from vllm.v1.worker.block_table import BlockTable
+from lightop import fused_rms_norm_rope_contiguous
 
 try:
     from vllm.vllm_flash_attn import flash_attn_varlen_func
@@ -1163,7 +1164,6 @@ class MLACommonImpl(MLAAttentionImpl[M], Generic[M]):
                         kv_cache_dtype_str = "bf16"
                 else:
                     kv_cache_dtype_str = self.kv_cache_dtype
-                from lightop import fused_rms_norm_rope_contiguous
                 fused_rms_norm_rope_contiguous(
                     positions[:num_actual_toks, ...],
                     q,