[CPU] refine CPU integration code (#7647)

python/sglang/srt/layers/amx_utils.py

+import logging
+
+import torch
+
+from sglang.srt.utils import cpu_has_amx_support
+
+logger = logging.getLogger(__name__)
+
+
+def amx_process_weight_after_loading(weight):
+    if weight.device != torch.device("cpu"):
+        return weight
+    if not cpu_has_amx_support():
+        return weight
+
+    return torch.ops.sgl_kernel.convert_weight_packed(weight)
+
+
+# TODO: currently gemm kernel has the below requirements:
+# OC % TILE_N == 0, where TILE_N = 16
+# IC % TILE_K == 0, where TILE_K = 32
+def dim_is_supported(weight):
+    TILE_N = 16
+    TILE_K = 32
+    ndim = weight.ndim
+    OC = weight.size(1) if ndim == 3 else weight.size(0)
+    IC = weight.size(2) if ndim == 3 else weight.size(1)
+    return OC % TILE_N == 0 and IC % TILE_K == 0
+
+
+def _amx_process_weight_after_loading(
+    module, weight_names, transpose_dims=None
+) -> None:
+    # Pack weight for get better performance on CPU
+    devices = {getattr(module, weight_name).device for weight_name in weight_names}
+    assert len(devices) == 1, f"Expects all weights to be on the same device"
+    device = devices.pop()
+
+    if transpose_dims:
+        assert len(weight_names) == len(
+            transpose_dims
+        ), "len(weight_names) should be equal to len(transpose_dims)"
+
+    for i, weight_name in enumerate(weight_names):
+        weight_tensor = getattr(module, weight_name)
+
+        if transpose_dims and transpose_dims[i]:
+            weight_tensor = weight_tensor.transpose(*transpose_dims[i])
+
+        # We don't pack weight or use intel amx backend if any weight of this module has unsupported dim.
+        if not dim_is_supported(weight_tensor):
+            logger.warning(
+                f"Unsupported dimension for prepacking for weight '{weight_name}' with shape {weight_tensor.shape} in {module}. "
+                f"The derived (OC, IC) dimensions must be divisible by (16, 32). "
+            )
+            module.use_intel_amx_backend = False
+            return
+
+        packed_weight = torch.nn.Parameter(
+            amx_process_weight_after_loading(weight_tensor),
+            requires_grad=False,
+        )
+        packed_weight.__dict__ = weight_tensor.__dict__
+        setattr(module, weight_name, packed_weight)
+
+    module.use_intel_amx_backend = (
+        device == torch.device("cpu") and cpu_has_amx_support()
+    )
+
+    if (
+        module.use_intel_amx_backend
+        and hasattr(module, "bias")
+        and module.bias is not None
+    ):
+        module.bias = torch.nn.Parameter(module.bias.data.float(), requires_grad=False)
+
+
+class PackWeightMethod:
+    def __init__(self, weight_names, transpose_dims=None):
+        self.weight_names = weight_names
+        self.transpose_dims = transpose_dims
+
+    def process_weights_after_loading(self, module) -> None:
+        _amx_process_weight_after_loading(
+            module, self.weight_names, self.transpose_dims
+        )

python/sglang/srt/layers/linear.py

@@ -17,6 +17,7 @@ from sglang.srt.distributed import (
     tensor_model_parallel_all_gather,
     tensor_model_parallel_all_reduce,
 )
+from sglang.srt.layers.amx_utils import _amx_process_weight_after_loading
 from sglang.srt.layers.parameter import (
     BasevLLMParameter,
     BlockQuantScaleParameter,
@@ -31,10 +32,10 @@ from sglang.srt.layers.quantization.base_config import (
     QuantizeMethodBase,
 )
 from sglang.srt.utils import (
-    _process_weight_after_loading,
     cpu_has_amx_support,
     is_cpu,
     set_weight_attrs,
+    use_intel_amx_backend,
 )
 
 logger = logging.getLogger(__name__)
@@ -175,7 +176,7 @@ class UnquantizedLinearMethod(LinearMethodBase):
 
     def process_weights_after_loading(self, layer: torch.nn.Module) -> None:
         if _is_cpu and _is_cpu_amx_available:
-            _process_weight_after_loading(layer, ["weight"])
+            _amx_process_weight_after_loading(layer, ["weight"])
 
     def apply(
         self,
@@ -184,7 +185,7 @@ class UnquantizedLinearMethod(LinearMethodBase):
         bias: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
 
-        if getattr(layer, "use_intel_amx_backend", False):
+        if use_intel_amx_backend(layer):
             return torch.ops.sgl_kernel.weight_packed_linear(
                 x, layer.weight, bias, True  # is_vnni
             )

python/sglang/srt/layers/logits_processor.py

@@ -42,7 +42,7 @@ from sglang.srt.model_executor.forward_batch_info import (
     ForwardBatch,
     ForwardMode,
 )
-from sglang.srt.utils import dump_to_file
+from sglang.srt.utils import dump_to_file, use_intel_amx_backend
 
 logger = logging.getLogger(__name__)
 
@@ -442,7 +442,7 @@ class LogitsProcessor(nn.Module):
             dp_gather_replicate(hidden_states, local_hidden_states, logits_metadata)
 
         if hasattr(lm_head, "weight"):
-            if getattr(lm_head, "use_intel_amx_backend", False):
+            if use_intel_amx_backend(lm_head):
                 logits = torch.ops.sgl_kernel.weight_packed_linear(
                     hidden_states.to(lm_head.weight.dtype),
                     lm_head.weight,

python/sglang/srt/layers/moe/fused_moe_triton/layer.py

@@ -12,6 +12,7 @@ from sglang.srt.distributed import (
     get_tensor_model_parallel_world_size,
     tensor_model_parallel_all_reduce,
 )
+from sglang.srt.layers.amx_utils import _amx_process_weight_after_loading
 from sglang.srt.layers.moe.fused_moe_native import moe_forward_native
 from sglang.srt.layers.moe.topk import select_experts
 from sglang.srt.layers.quantization.base_config import (
@@ -19,12 +20,12 @@ from sglang.srt.layers.quantization.base_config import (
     QuantizeMethodBase,
 )
 from sglang.srt.utils import (
-    _process_weight_after_loading,
     cpu_has_amx_support,
     get_bool_env_var,
     is_cpu,
     is_hip,
     set_weight_attrs,
+    use_intel_amx_backend,
 )
 
 if torch.cuda.is_available():
@@ -129,7 +130,7 @@ class UnquantizedFusedMoEMethod(FusedMoEMethodBase, CustomOp):
 
         # Pack weight for get better performance on CPU
         if _is_cpu and _is_cpu_amx_available:
-            _process_weight_after_loading(layer, ["w13_weight", "w2_weight"])
+            _amx_process_weight_after_loading(layer, ["w13_weight", "w2_weight"])
 
         return
 
@@ -264,10 +265,7 @@ class UnquantizedFusedMoEMethod(FusedMoEMethodBase, CustomOp):
     ) -> torch.Tensor:
         assert activation == "silu", f"activation = {activation} is not supported."
 
-        if (
-            getattr(layer, "use_intel_amx_backend", False)
-            and not apply_router_weight_on_input
-        ):
+        if use_intel_amx_backend(layer) and not apply_router_weight_on_input:
             topk_weights, topk_ids = select_experts(
                 hidden_states=x,
                 router_logits=router_logits,

python/sglang/srt/layers/quantization/fp8.py

@@ -27,6 +27,7 @@ except ImportError:
 
 
 from sglang.srt.distributed import get_tensor_model_parallel_world_size
+from sglang.srt.layers.amx_utils import _amx_process_weight_after_loading
 from sglang.srt.layers.linear import (
     LinearBase,
     LinearMethodBase,
@@ -64,7 +65,6 @@ from sglang.srt.layers.quantization.utils import (
 )
 from sglang.srt.layers.utils import is_sm100_supported
 from sglang.srt.utils import (
-    _process_weight_after_loading,
     cpu_has_amx_support,
     get_bool_env_var,
     is_cpu,
@@ -74,6 +74,7 @@ from sglang.srt.utils import (
     log_info_on_rank0,
     print_warning_once,
     set_weight_attrs,
+    use_intel_amx_backend,
 )
 
 _is_hip = is_hip()
@@ -335,7 +336,7 @@ class Fp8LinearMethod(LinearMethodBase):
                 assert (
                     _is_cpu_amx_available
                 ), "Fp8LinearMethod on CPU requires that CPU has AMX support"
-                _process_weight_after_loading(layer, ["weight"])
+                _amx_process_weight_after_loading(layer, ["weight"])
                 return
             else:
                 weight, weight_scale = layer.weight.data, layer.weight_scale_inv.data
@@ -433,7 +434,7 @@ class Fp8LinearMethod(LinearMethodBase):
             )
 
         if self.block_quant:
-            if getattr(layer, "use_intel_amx_backend", False):
+            if use_intel_amx_backend(layer):
                 return torch.ops.sgl_kernel.fp8_scaled_mm_cpu(
                     x,
                     layer.weight,
@@ -769,7 +770,7 @@ class Fp8MoEMethod:
                 assert (
                     _is_cpu_amx_available
                 ), "Fp8MoEMethod on CPU requires that CPU has AMX support"
-                _process_weight_after_loading(layer, ["w13_weight", "w2_weight"])
+                _amx_process_weight_after_loading(layer, ["w13_weight", "w2_weight"])
 
             return
 
@@ -996,7 +997,7 @@ class Fp8MoEMethod:
             routed_scaling_factor=routed_scaling_factor,
         )
 
-        if getattr(layer, "use_intel_amx_backend", False):
+        if use_intel_amx_backend(layer):
             return torch.ops.sgl_kernel.fused_experts_cpu(
                 x,
                 layer.w13_weight,

python/sglang/srt/layers/quantization/w8a8_int8.py

@@ -4,6 +4,7 @@ import torch
 from torch.nn.parameter import Parameter
 
 from sglang.srt.distributed import get_tensor_model_parallel_world_size
+from sglang.srt.layers.amx_utils import _amx_process_weight_after_loading
 from sglang.srt.layers.linear import LinearMethodBase
 from sglang.srt.layers.parameter import ChannelQuantScaleParameter, ModelWeightParameter
 from sglang.srt.layers.quantization.base_config import (
@@ -12,11 +13,11 @@ from sglang.srt.layers.quantization.base_config import (
 )
 from sglang.srt.layers.quantization.int8_kernel import per_token_quant_int8
 from sglang.srt.utils import (
-    _process_weight_after_loading,
     cpu_has_amx_support,
     is_cpu,
     is_cuda,
     set_weight_attrs,
+    use_intel_amx_backend,
 )
 
 _is_cuda = is_cuda()
@@ -84,7 +85,7 @@ class W8A8Int8LinearMethod(LinearMethodBase):
             assert (
                 _is_cpu_amx_available
             ), "W8A8Int8LinearMethod on CPU requires that CPU has AMX support"
-            _process_weight_after_loading(layer, ["weight"])
+            _amx_process_weight_after_loading(layer, ["weight"])
             return
 
         layer.weight = Parameter(layer.weight.t(), requires_grad=False)
@@ -127,7 +128,7 @@ class W8A8Int8LinearMethod(LinearMethodBase):
         x: torch.Tensor,
         bias: Optional[torch.Tensor] = None,
     ):
-        if getattr(layer, "use_intel_amx_backend", False):
+        if use_intel_amx_backend(layer):
             return torch.ops.sgl_kernel.int8_scaled_mm_with_quant(
                 x,
                 layer.weight,
@@ -235,7 +236,7 @@ class W8A8Int8MoEMethod:
             assert (
                 _is_cpu_amx_available
             ), "W8A8Int8MoEMethod on CPU requires that CPU has AMX support"
-            _process_weight_after_loading(layer, ["w13_weight", "w2_weight"])
+            _amx_process_weight_after_loading(layer, ["w13_weight", "w2_weight"])
             return
 
         layer.w13_weight = Parameter(layer.w13_weight, requires_grad=False)
@@ -284,7 +285,7 @@ class W8A8Int8MoEMethod:
             routed_scaling_factor=routed_scaling_factor,
         )
 
-        if getattr(layer, "use_intel_amx_backend", False):
+        if use_intel_amx_backend(layer):
             return torch.ops.sgl_kernel.fused_experts_cpu(
                 x,
                 layer.w13_weight,

python/sglang/srt/layers/vocab_parallel_embedding.py

@@ -13,6 +13,7 @@ from sglang.srt.distributed import (
     get_tensor_model_parallel_world_size,
     tensor_model_parallel_all_reduce,
 )
+from sglang.srt.layers.amx_utils import PackWeightMethod
 from sglang.srt.layers.dp_attention import get_attention_tp_rank, get_attention_tp_size
 from sglang.srt.layers.parameter import BasevLLMParameter
 from sglang.srt.layers.quantization.base_config import (
@@ -20,12 +21,7 @@ from sglang.srt.layers.quantization.base_config import (
     QuantizeMethodBase,
     method_has_implemented_embedding,
 )
-from sglang.srt.utils import (
-    PackWeightMethod,
-    cpu_has_amx_support,
-    is_cpu,
-    set_weight_attrs,
-)
+from sglang.srt.utils import cpu_has_amx_support, is_cpu, set_weight_attrs
 
 DEFAULT_VOCAB_PADDING_SIZE = 64
 

python/sglang/srt/models/deepseek_v2.py

@@ -36,6 +36,7 @@ from sglang.srt.eplb.expert_distribution import get_global_expert_distribution_r
 from sglang.srt.eplb.expert_location import ModelConfigForExpertLocation
 from sglang.srt.eplb.expert_location_dispatch import ExpertLocationDispatchInfo
 from sglang.srt.layers.activation import SiluAndMul
+from sglang.srt.layers.amx_utils import PackWeightMethod
 from sglang.srt.layers.communicator import (
     LayerCommunicator,
     LayerScatterModes,
@@ -91,7 +92,6 @@ from sglang.srt.utils import (
     BumpAllocator,
     DeepEPMode,
     LazyValue,
-    PackWeightMethod,
     add_prefix,
     bind_or_assign,
     cpu_has_amx_support,
@@ -103,6 +103,7 @@ from sglang.srt.utils import (
     is_hip,
     is_non_idle_and_non_empty,
     log_info_on_rank0,
+    use_intel_amx_backend,
 )
 
 _is_hip = is_hip()
@@ -224,7 +225,7 @@ class MoEGate(nn.Module):
             self.quant_method = PackWeightMethod(weight_names=["weight"])
 
     def forward(self, hidden_states):
-        if getattr(self, "use_intel_amx_backend", False):
+        if use_intel_amx_backend(self):
             return torch.ops.sgl_kernel.weight_packed_linear(
                 hidden_states,
                 self.weight,
@@ -437,8 +438,8 @@ class DeepseekV2MoE(nn.Module):
         return final_hidden_states
 
     def forward_normal(self, hidden_states: torch.Tensor) -> torch.Tensor:
-        if hasattr(self, "shared_experts") and getattr(
-            self.shared_experts.gate_up_proj, "use_intel_amx_backend", False
+        if hasattr(self, "shared_experts") and use_intel_amx_backend(
+            self.shared_experts.gate_up_proj
         ):
             return self.forward_cpu(hidden_states)
 
@@ -464,9 +465,9 @@ class DeepseekV2MoE(nn.Module):
             hidden_states=hidden_states, router_logits=router_logits
         )
 
-        assert getattr(
-            self.shared_experts.gate_up_proj, "use_intel_amx_backend", False
-        ) == getattr(self.shared_experts.down_proj, "use_intel_amx_backend", False)
+        assert use_intel_amx_backend(
+            self.shared_experts.gate_up_proj
+        ) == use_intel_amx_backend(self.shared_experts.down_proj)
         # [Note] inplace should be False in fused_experts.
         # If inplace is True in fused_experts (self.experts), hidden_states will be changed after fused_experts
         # While hidden_states is still needed in shared_expert.
@@ -928,15 +929,23 @@ class DeepseekV2AttentionMLA(nn.Module):
         )
 
         self.weight_block_size = None
-        if self.qkv_proj_with_rope_is_fp8:
-            assert (
-                self.fused_qkv_a_proj_with_mqa.quant_method.quant_config.weight_block_size
-                == self.q_b_proj.quant_method.quant_config.weight_block_size
-            )
-            self.weight_block_size = (
-                self.fused_qkv_a_proj_with_mqa.quant_method.quant_config.weight_block_size
+        if self.qkv_proj_with_rope_is_fp8 and _is_cpu and _is_cpu_amx_available:
+            assert getattr(
+                self.fused_qkv_a_proj_with_mqa.quant_method, "block_quant", False
+            ) == getattr(self.q_b_proj.quant_method, "block_quant", False)
+            use_block_quant = getattr(
+                self.fused_qkv_a_proj_with_mqa.quant_method, "block_quant", False
             )
 
+            if use_block_quant:
+                assert (
+                    self.fused_qkv_a_proj_with_mqa.quant_method.quant_config.weight_block_size
+                    == self.q_b_proj.quant_method.quant_config.weight_block_size
+                )
+                self.weight_block_size = (
+                    self.fused_qkv_a_proj_with_mqa.quant_method.quant_config.weight_block_size
+                )
+
     def dispatch_attn_forward_method(
         self, forward_batch: ForwardBatch
     ) -> AttnForwardMethod:
@@ -950,8 +959,8 @@ class DeepseekV2AttentionMLA(nn.Module):
                 else:
                     return AttnForwardMethod.MLA
             else:
-                if hasattr(self, "fused_qkv_a_proj_with_mqa") and getattr(
-                    self, "use_intel_amx_backend", False
+                if hasattr(self, "fused_qkv_a_proj_with_mqa") and use_intel_amx_backend(
+                    self
                 ):
                     return AttnForwardMethod.MLA_FUSED_ROPE_CPU
                 else:
@@ -1426,8 +1435,8 @@ class DeepseekV2AttentionMLA(nn.Module):
         forward_batch: ForwardBatch,
         zero_allocator: BumpAllocator,
     ):
-        assert self.q_lora_rank is not None and getattr(
-            self, "use_intel_amx_backend", False
+        assert self.q_lora_rank is not None and use_intel_amx_backend(
+            self
         ), "forward_absorb_fused_mla_rope_cpu_prepare requires q_lora_rank is not None and use_intel_amx_backend"
 
         q_input, k_input, v_input = (
@@ -1546,8 +1555,8 @@ class DeepseekV2AttentionMLA(nn.Module):
     def forward_absorb_fused_mla_rope_cpu_core(
         self, q_input, k_input, v_input, forward_batch, zero_allocator
     ):
-        assert self.q_lora_rank is not None and getattr(
-            self, "use_intel_amx_backend", False
+        assert self.q_lora_rank is not None and use_intel_amx_backend(
+            self
         ), "forward_absorb_fused_mla_rope_cpu_core requires q_lora_rank is not None and use_intel_amx_backend"
 
         attn_output = self.attn_mqa(q_input, k_input, v_input, forward_batch)

python/sglang/srt/utils.py

@@ -2416,75 +2416,8 @@ def cpu_has_amx_support():
     return torch._C._cpu._is_amx_tile_supported() and is_intel_amx_backend_available
 
 
-def prepack_weight_if_needed(weight):
-    if weight.device != torch.device("cpu"):
-        return weight
-    if not cpu_has_amx_support():
-        return weight
-
-    return torch.ops.sgl_kernel.convert_weight_packed(weight)
-
-
-# TODO: currently gemm kernel has the below requirements:
-# OC % TILE_N == 0, where TILE_N = 16
-# IC % TILE_K == 0, where TILE_K = 32
-def dim_is_supported(weight):
-    return weight.size(0) % 16 == 0 and weight.size(1) % 32 == 0
-
-
-def _process_weight_after_loading(module, weight_names, transpose_dims=None) -> None:
-    # Pack weight for get better performance on CPU
-    devices = {getattr(module, weight_name).device for weight_name in weight_names}
-    assert len(devices) == 1, f"Expects all weights to be on the same device"
-    device = devices.pop()
-
-    if transpose_dims:
-        assert len(weight_names) == len(
-            transpose_dims
-        ), "len(weight_names) should be equal to len(transpose_dims)"
-
-    for i, weight_name in enumerate(weight_names):
-        weight_tensor = getattr(module, weight_name)
-
-        # We don't pack weight or use intel amx backend if any weight of this module has unsupported dim.
-        if not dim_is_supported(weight_tensor):
-            logger.warning(
-                f"Expects weight.size(0) % 16 == 0 and weight.size(1) % 32 == 0 "
-                f"but {weight_tensor.size(0)=} and {weight_tensor.size(1)=} in {module}. "
-                f"{module} won't use intel amx backend."
-            )
-            module.use_intel_amx_backend = False
-            return
-
-        if transpose_dims and transpose_dims[i]:
-            weight_tensor = weight_tensor.transpose(*transpose_dims[i])
-
-        packed_weight = torch.nn.Parameter(
-            prepack_weight_if_needed(weight_tensor),
-            requires_grad=False,
-        )
-        packed_weight.__dict__ = weight_tensor.__dict__
-        setattr(module, weight_name, packed_weight)
-
-    module.use_intel_amx_backend = (
-        device == torch.device("cpu") and cpu_has_amx_support()
-    )
-
-    if (
-        module.use_intel_amx_backend
-        and hasattr(module, "bias")
-        and module.bias is not None
-    ):
-        module.bias = torch.nn.Parameter(module.bias.data.float(), requires_grad=False)
-
-
-class PackWeightMethod:
-    def __init__(self, weight_names, transpose_dims=None):
-        self.weight_names = weight_names
-        self.transpose_dims = transpose_dims
-
-    def process_weights_after_loading(self, module) -> None:
-        _process_weight_after_loading(module, self.weight_names, self.transpose_dims)
+def use_intel_amx_backend(layer):
+    return getattr(layer, "use_intel_amx_backend", False)
 
 
 class LazyValue: