[Fusion] [Graph]Add Matmul Allreduce Rmsnorm fusion Pass

vllm_ascend/ascend_config.py

@@ -224,7 +224,7 @@ class AscendCompilationConfig:
     deployed on Ascend platforms.
     """
 
-    def __init__(self, fuse_norm_quant: bool = True, **kwargs):
+    def __init__(self, fuse_norm_quant: bool = True, fuse_allreduce_rms: bool = True, **kwargs):
         """
         Initialize the configuration.
 
@@ -236,7 +236,7 @@ def __init__(self, fuse_norm_quant: bool = True, **kwargs):
             **kwargs: Additional optional parameters for forward compatibility and configuration extension.
         """
         self.fuse_norm_quant = fuse_norm_quant
-        # Add more compilation related configs here as needed
+        self.fuse_allreduce_rms = fuse_allreduce_rms
 
 
 class XliteGraphConfig:

vllm_ascend/compilation/compiler_interface.py

@@ -49,7 +49,9 @@ def fusion_pass_compile(
     runtime_shape: Optional[int] = None,
     key: Optional[str] = None,
 ) -> tuple[Optional[Callable], Optional[Any]]:
-
+    print("=========torch compile graph=========")
+    print(graph.graph)
+
     def compile_inner(graph, example_inputs):
         current_pass_manager = compiler_config["graph_fusion_manager"]
         graph = current_pass_manager(graph, runtime_shape)

vllm_ascend/compilation/graph_fusion_pass_manager.py

@@ -50,4 +50,6 @@ def configure(self, config: VllmConfig):
             from .passes.norm_quant_fusion_pass import \
                 AddRMSNormQuantFusionPass
             self.passes.append(AddRMSNormQuantFusionPass(config))
-        # Add more passes here as needed
+        if self.ascend_compilation_config.get("fuse_allreduce_rms", True):
+            from .passes.allreduce_rmsnorm_fusion_pass import MatmulAllReduceAddRMSNormPass
+            self.passes.append(MatmulAllReduceAddRMSNormPass(config))

vllm_ascend/compilation/passes/allreduce_rmsnorm_fusion_pass.py

@@ -0,0 +1,98 @@
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+# This file is a part of the vllm-ascend project.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0  
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+import torch
+import torch._inductor.pattern_matcher as pm
+from torch._inductor.pattern_matcher import PatternMatcherPass
+from vllm.compilation.vllm_inductor_pass import VllmInductorPass
+from vllm.distributed.parallel_state import get_tp_group
+from vllm.config import VllmConfig
+
+import logging
+
+class MatmulAllReduceAddRMSNormPattern:
+
+    def __init__(self, vllm_config, eps=1e-6):
+        self.vllm_config = vllm_config
+        self.eps = eps
+        device_group = get_tp_group().device_group
+        self.local_rank = torch.distributed.get_rank(group=device_group)
+        backend = device_group._get_backend(torch.device("npu"))
+        self.tp_group_name = backend.get_hccl_comm_name(self.local_rank)
+
+    def get_inputs(self):
+        """
+        Generate example inputs for the AddRMSNormQuant fusion pattern.
+        """
+        x = torch.randn(2, 4, device="npu")
+        weight = torch.randn(8, 4, device="npu")
+        residual = torch.randn(2, 8, device="npu")
+        rms_norm_weight = torch.randn(8, device="npu")
+        return [x, weight, residual, rms_norm_weight]
+
+    def register(self, pm_pass: PatternMatcherPass):
+
+        def pattern(x, weight, residual, rms_norm_weight):
+            """
+            Pattern for AddRMSNormQuant fusion.
+            """
+            tmp = torch.nn.functional.linear(x, weight)
+            all_reduce_ = torch.ops.vllm.all_reduce(tmp, group_name="")
+            output = torch.ops.npu.npu_add_rms_norm(all_reduce_, residual, rms_norm_weight, self.eps)
+            out0 = output[0]
+            out1 = output[2]
+
+            return out0, out1
+
+        def replacement(x, weight, residual, rms_norm_weight):
+            """
+            Replacement for the AddRMSNormQuant fusion.
+            """
+            out0, out1 = torch.ops._C_ascend.matmul_allreduce_add_rmsnorm(x, weight, residual, rms_norm_weight,
+                            self.tp_group_name, 0, 0, self.eps, True, True)
+            return out0, out1
+
+        pm.register_replacement(pattern, replacement, self.get_inputs(),
+                                pm.fwd_only, pm_pass)
+
+
+class MatmulAllReduceAddRMSNormPass(VllmInductorPass):
+    def __init__(self, vllm_config: VllmConfig):
+        super().__init__(vllm_config)
+        self.pattern_match_passes: PatternMatcherPass = PatternMatcherPass(
+            pass_name="allreduce_rmsnorm_fusion_pass")
+
+        common_epsilons = [1e-5, 1e-6]
+        for eps in common_epsilons:
+            MatmulAllReduceAddRMSNormPattern(vllm_config,
+                                   eps=eps).register(self.pattern_match_passes)
+
+    def __call__(self, graph: torch.fx.Graph):
+        logging.info("=========before fusion graph========")
+        logging.info(graph.graph)
+        self.begin()
+        self.matched_count = self.pattern_match_passes.apply(graph)
+        logging.info("=========after fusion graph========")
+        logging.info(graph.graph)
+        logging.warning("Replaced %s patterns", self.matched_count)
+        self.end_and_log()
+
+
+    def is_applicable(self, runtime_shape):
+        """
+        Check if the pass is applicable for the current configuration.
+        """
+        return True