Refactor dense FP8 tensor/channel/block utils and add CT FP8 block (#21404)

vllm/model_executor/layers/linear.py

@@ -805,12 +805,10 @@ class MergedColumnParallelLinear(ColumnParallelLinear):
         assert loaded_shard_id < len(self.output_sizes)
 
         if isinstance(param, BlockQuantScaleParameter):
-            from vllm.model_executor.layers.quantization.fp8 import (
-                Fp8LinearMethod, Fp8MoEMethod)
             assert self.quant_method is not None
-            assert isinstance(self.quant_method,
-                              (Fp8LinearMethod, Fp8MoEMethod))
-            weight_block_size = self.quant_method.quant_config.weight_block_size
+            # Assume the weight block size has been set by quant method
+            assert hasattr(self, "weight_block_size")
+            weight_block_size = self.weight_block_size
             assert weight_block_size is not None
             block_n, _ = weight_block_size[0], weight_block_size[1]
             shard_offset = (
@@ -989,8 +987,10 @@ class QKVParallelLinear(ColumnParallelLinear):
         # Note(simon): This is needed for Qwen3's fp8 quantization.
         if isinstance(param, BlockQuantScaleParameter):
             assert self.quant_method is not None
-            assert hasattr(self.quant_method, "quant_config")
-            weight_block_size = self.quant_method.quant_config.weight_block_size
+            # Assume the weight block size has been set by quant method
+            assert hasattr(self, "weight_block_size")
+            weight_block_size = self.weight_block_size
+            assert weight_block_size is not None
             block_n, _ = weight_block_size[0], weight_block_size[1]
             shard_offset = (shard_offset + block_n - 1) // block_n
             shard_size = (shard_size + block_n - 1) // block_n

vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py

@@ -12,7 +12,6 @@ from compressed_tensors.quantization import (QuantizationArgs,
                                              QuantizationStrategy,
                                              QuantizationType)
 from compressed_tensors.transform import TransformConfig
-from pydantic import BaseModel
 
 import vllm.envs as envs
 from vllm.logger import init_logger
@@ -268,7 +267,8 @@ class CompressedTensorsConfig(QuantizationConfig):
         else:
             return False
 
-    def _is_fp4a4_nvfp4(self, weight_quant: BaseModel, input_quant: BaseModel):
+    def _is_fp4a4_nvfp4(self, weight_quant: QuantizationArgs,
+                        input_quant: QuantizationArgs):
 
         if weight_quant is None or input_quant is None:
             return False
@@ -288,8 +288,8 @@ class CompressedTensorsConfig(QuantizationConfig):
         return (is_tensor_group_quant and is_float_type and is_4_bits
                 and is_group_size_16 and is_symmetric)
 
-    def _is_fp4a16_nvfp4(self, weight_quant: BaseModel,
-                         input_quant: BaseModel):
+    def _is_fp4a16_nvfp4(self, weight_quant: QuantizationArgs,
+                         input_quant: QuantizationArgs):
 
         is_weight_only = weight_quant is not None and input_quant is None
         is_tensor_group_quant = (
@@ -303,8 +303,8 @@ class CompressedTensorsConfig(QuantizationConfig):
         return (is_weight_only and is_tensor_group_quant and is_float_type
                 and is_4_bits and is_group_size_16 and is_symmetric)
 
-    def _is_static_tensor_w8a8(self, weight_quant: BaseModel,
-                               input_quant: BaseModel) -> bool:
+    def _is_static_tensor_w8a8(self, weight_quant: QuantizationArgs,
+                               input_quant: QuantizationArgs) -> bool:
         is_8_bits = weight_quant.num_bits == input_quant.num_bits == 8
         weight_strategy = (
             weight_quant.strategy == QuantizationStrategy.TENSOR.value
@@ -317,8 +317,8 @@ class CompressedTensorsConfig(QuantizationConfig):
         # Only symmetric weight quantization supported.
         return is_8_bits and is_tensor and weight_quant.symmetric and is_static
 
-    def _is_dynamic_token_w8a8(self, weight_quant: BaseModel,
-                               input_quant: BaseModel) -> bool:
+    def _is_dynamic_token_w8a8(self, weight_quant: QuantizationArgs,
+                               input_quant: QuantizationArgs) -> bool:
         is_8_bits = weight_quant.num_bits == input_quant.num_bits == 8
         weight_strategy = (
             weight_quant.strategy == QuantizationStrategy.TENSOR.value
@@ -331,8 +331,8 @@ class CompressedTensorsConfig(QuantizationConfig):
         # Only symmetric weight quantization supported.
         return is_8_bits and is_token and weight_quant.symmetric and is_dynamic
 
-    def _is_dynamic_token_w4a8_int(self, weight_quant: BaseModel,
-                                   input_quant: BaseModel) -> bool:
+    def _is_dynamic_token_w4a8_int(self, weight_quant: QuantizationArgs,
+                                   input_quant: QuantizationArgs) -> bool:
         is_weight_4_bits = weight_quant.num_bits == 4
         is_activation_8_bits = input_quant.num_bits == 8
         weight_strategy = (
@@ -347,8 +347,8 @@ class CompressedTensorsConfig(QuantizationConfig):
         return (is_weight_4_bits and is_activation_8_bits and is_token
                 and weight_quant.symmetric and is_dynamic)
 
-    def _is_fp8_w8a8(self, weight_quant: BaseModel,
-                     input_quant: BaseModel) -> bool:
+    def _is_fp8_w8a8(self, weight_quant: QuantizationArgs,
+                     input_quant: QuantizationArgs) -> bool:
         # Confirm weights and activations quantized.
         if weight_quant is None or input_quant is None:
             return False
@@ -358,11 +358,12 @@ class CompressedTensorsConfig(QuantizationConfig):
                              and input_quant.type == QuantizationType.FLOAT)
         is_symmetric_weight = weight_quant.symmetric
         is_static_weight = not weight_quant.dynamic
-        is_per_tensor_or_channel_weight = (weight_quant.strategy in [
-            QuantizationStrategy.TENSOR, QuantizationStrategy.CHANNEL
+        is_tensor_or_channel_or_block_weight = (weight_quant.strategy in [
+            QuantizationStrategy.TENSOR, QuantizationStrategy.CHANNEL,
+            QuantizationStrategy.BLOCK
         ])
         if not (is_floating_point and is_symmetric_weight and is_static_weight
-                and is_per_tensor_or_channel_weight):
+                and is_tensor_or_channel_or_block_weight):
             return False
 
         # Dynamic quantization is always supported if weights supported.
@@ -375,8 +376,8 @@ class CompressedTensorsConfig(QuantizationConfig):
             input_quant.strategy == QuantizationStrategy.TENSOR)
         return is_symmetric_activation and is_per_tensor_activation
 
-    def _is_fp8_w4a8(self, weight_quant: BaseModel,
-                     input_quant: BaseModel) -> bool:
+    def _is_fp8_w4a8(self, weight_quant: QuantizationArgs,
+                     input_quant: QuantizationArgs) -> bool:
         if not weight_quant or not input_quant:
             return False
         is_weight_4_bits = weight_quant.num_bits == 4
@@ -392,24 +393,24 @@ class CompressedTensorsConfig(QuantizationConfig):
         return (is_weight_4_bits and is_activation_8_bits and is_token
                 and is_symmetric and is_dynamic)
 
-    def _is_fp8_w4a8_sm90(self, weight_quant: BaseModel,
-                          input_quant: BaseModel) -> bool:
+    def _is_fp8_w4a8_sm90(self, weight_quant: QuantizationArgs,
+                          input_quant: QuantizationArgs) -> bool:
         return (self._check_scheme_supported(90, error=False, match_exact=True)
                 and self._is_fp8_w4a8(weight_quant, input_quant))
 
-    def _is_fp8_w8a8_sm90(self, weight_quant: BaseModel,
-                          input_quant: BaseModel) -> bool:
+    def _is_fp8_w8a8_sm90(self, weight_quant: QuantizationArgs,
+                          input_quant: QuantizationArgs) -> bool:
         return (self._check_scheme_supported(90, error=False, match_exact=True)
                 and self._is_fp8_w8a8(weight_quant, input_quant))
 
-    def _is_fp8_w8a8_sm100(self, weight_quant: BaseModel,
-                           input_quant: BaseModel) -> bool:
+    def _is_fp8_w8a8_sm100(self, weight_quant: QuantizationArgs,
+                           input_quant: QuantizationArgs) -> bool:
         return (self._check_scheme_supported(
             100, error=False, match_exact=True)
                 and self._is_fp8_w8a8(weight_quant, input_quant))
 
-    def _is_fp8_w8a16(self, weight_quant: BaseModel,
-                      input_quant: BaseModel) -> bool:
+    def _is_fp8_w8a16(self, weight_quant: QuantizationArgs,
+                      input_quant: QuantizationArgs) -> bool:
         # Confirm weights quantized.
         if weight_quant is None:
             return False
@@ -421,18 +422,19 @@ class CompressedTensorsConfig(QuantizationConfig):
         # Confirm weight scheme is supported.
         is_symmetric_weight = weight_quant.symmetric
         is_static_weight = not weight_quant.dynamic
-        is_per_tensor_or_channel_weight = (weight_quant.strategy in [
-            QuantizationStrategy.TENSOR, QuantizationStrategy.CHANNEL
+        is_tensor_or_channel_or_block_weight = (weight_quant.strategy in [
+            QuantizationStrategy.TENSOR, QuantizationStrategy.CHANNEL,
+            QuantizationStrategy.BLOCK
         ])
         if not (is_symmetric_weight and is_static_weight  # noqa: SIM103
-                and is_per_tensor_or_channel_weight):
+                and is_tensor_or_channel_or_block_weight):
             return False
 
         # All conditions satisfied.
         return True
 
-    def _is_wNa16_group_channel(self, weight_quant: BaseModel,
-                                input_quant: BaseModel) -> bool:
+    def _is_wNa16_group_channel(self, weight_quant: QuantizationArgs,
+                                input_quant: QuantizationArgs) -> bool:
         input_quant_none = input_quant is None
         is_channel_group = (
             weight_quant.strategy == QuantizationStrategy.CHANNEL.value
@@ -443,8 +445,8 @@ class CompressedTensorsConfig(QuantizationConfig):
 
     def _get_scheme_from_parts(
             self,
-            weight_quant: BaseModel,
-            input_quant: BaseModel,
+            weight_quant: QuantizationArgs,
+            input_quant: QuantizationArgs,
             format: Optional[str] = None) -> "CompressedTensorsScheme":
 
         # use the per-layer format if defined, otherwise, use global format
@@ -496,7 +498,7 @@ class CompressedTensorsConfig(QuantizationConfig):
                     CompressedTensorsW8A8Fp8.get_min_capability(), error=False)
                 if is_fp8_w8a8_supported:
                     return CompressedTensorsW8A8Fp8(
-                        strategy=weight_quant.strategy,
+                        weight_quant=weight_quant,
                         is_static_input_scheme=(input_quant
                                                 and not input_quant.dynamic))
                 else:

vllm/model_executor/layers/quantization/compressed_tensors/schemes/compressed_tensors_w8a8_fp8.py

@@ -4,28 +4,41 @@
 from typing import Callable, Optional
 
 import torch
-from compressed_tensors.quantization import QuantizationStrategy
+from compressed_tensors.quantization import (QuantizationArgs,
+                                             QuantizationStrategy)
 from torch.nn import Parameter
 
 from vllm.model_executor.layers.quantization.compressed_tensors.schemes import (
     CompressedTensorsScheme)
+from vllm.model_executor.layers.quantization.utils.fp8_utils import (
+    apply_fp8_block_linear, check_aiter_fp8_linear_support,
+    create_fp8_input_scale, create_fp8_scale_parameter,
+    create_fp8_weight_parameter, maybe_post_process_fp8_weight_block,
+    process_fp8_weight_block_strategy, process_fp8_weight_channel_strategy,
+    process_fp8_weight_tensor_strategy, validate_fp8_block_shape)
 from vllm.model_executor.layers.quantization.utils.quant_utils import (
     GroupShape)
 from vllm.model_executor.layers.quantization.utils.w8a8_utils import (
-    Fp8LinearOp, maybe_create_device_identity, normalize_e4m3fn_to_e4m3fnuz,
-    requantize_with_max_scale)
-from vllm.model_executor.parameter import (ChannelQuantScaleParameter,
-                                           ModelWeightParameter,
+    Fp8LinearOp, cutlass_block_fp8_supported, maybe_create_device_identity)
+from vllm.model_executor.parameter import (BlockQuantScaleParameter,
+                                           ChannelQuantScaleParameter,
                                            PerTensorScaleParameter)
-from vllm.platforms import current_platform
 
 __all__ = ["CompressedTensorsW8A8Fp8"]
 
+strategy_to_parameter_type = {
+    QuantizationStrategy.BLOCK: BlockQuantScaleParameter,
+    QuantizationStrategy.CHANNEL: ChannelQuantScaleParameter,
+    QuantizationStrategy.TENSOR: PerTensorScaleParameter,
+}
+
 
 class CompressedTensorsW8A8Fp8(CompressedTensorsScheme):
 
-    def __init__(self, strategy: str, is_static_input_scheme: bool):
-        self.strategy = strategy
+    def __init__(self, weight_quant: QuantizationArgs,
+                 is_static_input_scheme: bool):
+        self.weight_quant = weight_quant
+        self.strategy = weight_quant.strategy
         self.out_dtype = torch.get_default_dtype()
         self.is_static_input_scheme = is_static_input_scheme
         self.act_q_group_shape = GroupShape.PER_TENSOR \
@@ -34,120 +47,108 @@ class CompressedTensorsW8A8Fp8(CompressedTensorsScheme):
             act_quant_static=self.is_static_input_scheme,
             act_quant_group_shape=self.act_q_group_shape)
 
+        self.weight_block_size = self.weight_quant.block_structure
+        self.cutlass_block_fp8_supported = cutlass_block_fp8_supported()
+        self.use_aiter_and_is_supported = check_aiter_fp8_linear_support()
+
     @classmethod
     def get_min_capability(cls) -> int:
         # lovelace and up
         return 89
 
-    def process_weights_after_loading(self, layer) -> None:
-        # If per tensor, when we have a fused module (e.g. QKV) with per
-        # tensor scales (thus N scales being passed to the kernel),
-        # requantize so we can always run per tensor
-        if self.strategy == QuantizationStrategy.TENSOR:
-            max_w_scale, weight = requantize_with_max_scale(
-                weight=layer.weight,
-                weight_scale=layer.weight_scale,
-                logical_widths=layer.logical_widths,
-            )
-
-            if current_platform.is_fp8_fnuz():
-                input_scale = getattr(layer, 'input_scale', None)
-
-                weight, max_w_scale, input_scale = normalize_e4m3fn_to_e4m3fnuz(
-                    weight=weight,
-                    weight_scale=max_w_scale,
-                    input_scale=input_scale)
-                if input_scale is not None:
-                    layer.input_scale = Parameter(input_scale,
-                                                  requires_grad=False)
-
-            layer.weight = Parameter(weight.t(), requires_grad=False)
-            layer.weight_scale = Parameter(max_w_scale, requires_grad=False)
-
-        # If channelwise, scales are already lined up, so just transpose.
-        elif self.strategy == QuantizationStrategy.CHANNEL:
-            weight = layer.weight
-
-            if current_platform.is_fp8_fnuz():
-                input_scale = getattr(layer, 'input_scale', None)
-
-                weight, weight_scale, input_scale = \
-                    normalize_e4m3fn_to_e4m3fnuz(
-                        weight=weight,
-                        weight_scale=layer.weight_scale,
-                        input_scale=input_scale)
-                if input_scale is not None:
-                    layer.input_scale = Parameter(input_scale,
-                                                  requires_grad=False)
-            else:
-                weight_scale = layer.weight_scale.data
-
-            layer.weight = Parameter(weight.t(), requires_grad=False)
-            # required by torch.compile to be torch.nn.Parameter
-            layer.weight_scale = Parameter(weight_scale, requires_grad=False)
-
-        else:
-            raise ValueError(f"Unknown quantization strategy {self.strategy}")
-
-        # INPUT SCALE
-        if self.is_static_input_scheme and hasattr(layer, 'input_scale'):
-            layer.input_scale = Parameter(layer.input_scale.max(),
-                                          requires_grad=False)
-        else:
-            layer.input_scale = None
-
     def create_weights(self, layer: torch.nn.Module,
-                       output_partition_sizes: list[int],
                        input_size_per_partition: int,
-                       params_dtype: torch.dtype, weight_loader: Callable,
-                       **kwargs):
+                       output_partition_sizes: list[int], input_size: int,
+                       output_size: int, params_dtype: torch.dtype,
+                       weight_loader: Callable, **kwargs):
         maybe_create_device_identity()
 
         output_size_per_partition = sum(output_partition_sizes)
         layer.logical_widths = output_partition_sizes
+        layer.weight_block_size = None
+
+        if self.strategy == QuantizationStrategy.BLOCK:
+            assert self.weight_block_size is not None
+            layer.weight_block_size = self.weight_block_size
+            # Validate block quantization shapes
+            validate_fp8_block_shape(layer, input_size, output_size,
+                                     input_size_per_partition,
+                                     output_partition_sizes,
+                                     self.weight_block_size)
 
         # WEIGHT
-        weight = ModelWeightParameter(data=torch.empty(
-            output_size_per_partition,
-            input_size_per_partition,
-            dtype=torch.float8_e4m3fn),
-                                      input_dim=1,
-                                      output_dim=0,
-                                      weight_loader=weight_loader)
+        weight = create_fp8_weight_parameter(output_size_per_partition,
+                                             input_size_per_partition,
+                                             weight_loader)
         layer.register_parameter("weight", weight)
 
         # WEIGHT SCALE
-        # TODO: update create_xxx_parameter functions to return
-        # the newly added parameters
-        if self.strategy == QuantizationStrategy.CHANNEL:
-            weight_scale = ChannelQuantScaleParameter(
-                data=torch.empty((sum(output_partition_sizes), 1),
-                                 dtype=torch.float32),
-                output_dim=0,
-                weight_loader=weight_loader)
-        else:
-            assert self.strategy == QuantizationStrategy.TENSOR
-            weight_scale = PerTensorScaleParameter(data=torch.empty(
-                len(output_partition_sizes), dtype=torch.float32),
-                                                   weight_loader=weight_loader)
-
-        # min requirement for fp8 kernels
-        weight_scale[:] = torch.finfo(torch.float32).min
+        weight_scale = create_fp8_scale_parameter(
+            strategy_to_parameter_type[self.strategy], output_partition_sizes,
+            input_size_per_partition, layer.weight_block_size, weight_loader)
         layer.register_parameter("weight_scale", weight_scale)
 
         # INPUT SCALE
         if self.is_static_input_scheme:
-            input_scale = PerTensorScaleParameter(data=torch.empty(
-                len(output_partition_sizes), dtype=torch.float32),
-                                                  weight_loader=weight_loader)
-            input_scale[:] = torch.finfo(torch.float32).min
+            input_scale = create_fp8_input_scale(output_partition_sizes,
+                                                 weight_loader)
             layer.register_parameter("input_scale", input_scale)
 
+    def process_weights_after_loading(self, layer) -> None:
+        if self.strategy == QuantizationStrategy.TENSOR:
+            weight, weight_scale, input_scale = (
+                process_fp8_weight_tensor_strategy(
+                    layer.weight, layer.weight_scale, layer.logical_widths,
+                    getattr(layer, 'input_scale', None)))
+            weight = weight.t()
+
+        elif self.strategy == QuantizationStrategy.CHANNEL:
+            weight, weight_scale, input_scale = (
+                process_fp8_weight_channel_strategy(
+                    layer.weight, layer.weight_scale,
+                    getattr(layer, 'input_scale', None)))
+            weight = weight.t()
+
+        elif self.strategy == QuantizationStrategy.BLOCK:
+            assert self.is_static_input_scheme is False
+            weight, weight_scale = process_fp8_weight_block_strategy(
+                layer.weight, layer.weight_scale)
+            input_scale = None
+
+        else:
+            raise ValueError(f"Unknown quantization strategy {self.strategy}")
+
+        # required by torch.compile to be torch.nn.Parameter
+        layer.weight = Parameter(weight.data, requires_grad=False)
+        layer.weight_scale = Parameter(weight_scale.data, requires_grad=False)
+        if input_scale is not None:
+            layer.input_scale = Parameter(input_scale.data,
+                                          requires_grad=False)
+
+        # INPUT SCALE
+        if self.is_static_input_scheme and hasattr(layer, 'input_scale'):
+            layer.input_scale = Parameter(layer.input_scale.max(),
+                                          requires_grad=False)
+        else:
+            layer.input_scale = None
+
+        if self.strategy == QuantizationStrategy.BLOCK:
+            maybe_post_process_fp8_weight_block(
+                layer, self.cutlass_block_fp8_supported)
+
     def apply_weights(self,
                       layer: torch.nn.Module,
                       x: torch.Tensor,
                       bias: Optional[torch.Tensor] = None) -> torch.Tensor:
 
+        if layer.weight_block_size is not None:
+            return apply_fp8_block_linear(
+                layer,
+                input=x,
+                bias=bias,
+                cutlass_block_fp8_supported=self.cutlass_block_fp8_supported,
+                use_aiter_and_is_supported=self.use_aiter_and_is_supported)
+
         return self.fp8_linear.apply(input=x,
                                      weight=layer.weight,
                                      weight_scale=layer.weight_scale,

vllm/model_executor/layers/quantization/utils/fp8_utils.py

@@ -17,6 +17,9 @@ from vllm.model_executor.layers.quantization.utils.quant_utils import (
     group_broadcast)
 from vllm.model_executor.layers.quantization.utils.w8a8_utils import (
     CUTLASS_BLOCK_FP8_SUPPORTED)
+from vllm.model_executor.parameter import (BlockQuantScaleParameter,
+                                           ChannelQuantScaleParameter,
+                                           PerTensorScaleParameter)
 from vllm.platforms import current_platform
 from vllm.triton_utils import tl, triton
 from vllm.utils import cdiv, direct_register_custom_op
@@ -794,3 +797,220 @@ def requant_weight_ue8m0_inplace(
         # Write back the results in-place.
         w_q.copy_(w_requant)
         s_old.copy_(s_requant)
+
+
+def check_aiter_fp8_linear_support() -> bool:
+    """AITER is only supported on ROCm and only for FP8_FNUZ
+    and at the moment are MI300 series"""
+    return (current_platform.is_rocm() and envs.VLLM_ROCM_USE_AITER
+            and envs.VLLM_ROCM_USE_AITER_LINEAR
+            and current_platform.is_fp8_fnuz())
+
+
+def _maybe_pad_fp8_weight(weight: torch.Tensor) -> torch.Tensor:
+    """Pad the weight tensor. This is an optimization on ROCm platform, which
+    can benefit from tensors located far enough from one another in memory"""
+    if (envs.VLLM_ROCM_FP8_PADDING and current_platform.is_rocm()
+            and weight.stride(-1) == 1
+            and (weight.stride(-2) * weight.element_size()) % 512 == 0):
+        num_pad = 256 // weight.element_size()
+        import torch.nn.functional as F
+        weight = F.pad(weight, (0, num_pad), "constant", 0)[..., :-num_pad]
+        torch.cuda.empty_cache()
+    return weight
+
+
+def validate_fp8_block_shape(layer: torch.nn.Module, input_size: int,
+                             output_size: int, input_size_per_partition: int,
+                             output_partition_sizes: list[int],
+                             block_size: list[int]) -> None:
+    """Validate block quantization shapes for tensor parallelism."""
+    from vllm.distributed import get_tensor_model_parallel_world_size
+
+    tp_size = getattr(layer, "tp_size", get_tensor_model_parallel_world_size())
+    block_n, block_k = block_size[0], block_size[1]
+
+    # Required by row parallel
+    if (tp_size > 1 and input_size // input_size_per_partition == tp_size
+            and input_size_per_partition % block_k != 0):
+        raise ValueError(
+            f"Weight input_size_per_partition = {input_size_per_partition} "
+            f"is not divisible by weight quantization block_k = {block_k}.")
+
+    # Required by column parallel or enabling merged weights
+    is_tp_split = (tp_size > 1
+                   and output_size // sum(output_partition_sizes) == tp_size)
+    is_merged_gemm = len(output_partition_sizes) > 1
+    if is_tp_split or is_merged_gemm:
+        sizes_to_check = output_partition_sizes
+        if not is_tp_split and is_merged_gemm:
+            # In case of merged matrices, we allow the last
+            # matrix to not be a multiple of block size
+            sizes_to_check = output_partition_sizes[:-1]
+        for output_partition_size in sizes_to_check:
+            if output_partition_size % block_n != 0:
+                raise ValueError(
+                    f"Weight output_partition_size = "
+                    f"{output_partition_size} is not divisible by "
+                    f"weight quantization block_n = {block_n}.")
+
+
+def create_fp8_weight_parameter(
+        output_size_per_partition: int, input_size_per_partition: int,
+        weight_loader: Optional[Callable]) -> torch.nn.Parameter:
+    """Create FP8 weight parameter."""
+    from vllm.model_executor.parameter import ModelWeightParameter
+
+    return ModelWeightParameter(data=torch.empty(output_size_per_partition,
+                                                 input_size_per_partition,
+                                                 dtype=torch.float8_e4m3fn),
+                                input_dim=1,
+                                output_dim=0,
+                                weight_loader=weight_loader)
+
+
+def create_fp8_scale_parameter(
+        parameter_type: torch.nn.Parameter, output_partition_sizes: list[int],
+        input_size_per_partition: int, block_size: Optional[list[int]],
+        weight_loader: Optional[Callable]) -> torch.nn.Parameter:
+    """Create scale parameter based on quantization strategy."""
+    if parameter_type == ChannelQuantScaleParameter:
+        scale = parameter_type(data=torch.empty(
+            (sum(output_partition_sizes), 1), dtype=torch.float32),
+                               output_dim=0,
+                               weight_loader=weight_loader)
+    elif parameter_type == BlockQuantScaleParameter:
+        assert block_size is not None
+        block_n, block_k = block_size[0], block_size[1]
+        output_size_per_partition = sum(output_partition_sizes)
+        scale = parameter_type(
+            data=torch.empty(
+                (output_size_per_partition + block_n - 1) // block_n,
+                (input_size_per_partition + block_k - 1) // block_k,
+                dtype=torch.float32,
+            ),
+            input_dim=1,
+            output_dim=0,
+            weight_loader=weight_loader,
+        )
+    elif parameter_type == PerTensorScaleParameter:
+        scale = parameter_type(data=torch.empty(len(output_partition_sizes),
+                                                dtype=torch.float32),
+                               weight_loader=weight_loader)
+    else:
+        raise ValueError(f"Unknown parameter type: {parameter_type}")
+
+    scale[:] = torch.finfo(torch.float32).min
+    return scale
+
+
+def create_fp8_input_scale(
+        output_partition_sizes: list[int],
+        weight_loader: Optional[Callable]) -> torch.nn.Parameter:
+    """Create input scale parameter for static activation quantization."""
+    from vllm.model_executor.parameter import PerTensorScaleParameter
+
+    scale = PerTensorScaleParameter(data=torch.empty(
+        len(output_partition_sizes), dtype=torch.float32),
+                                    weight_loader=weight_loader)
+    scale[:] = torch.finfo(torch.float32).min
+    return scale
+
+
+def process_fp8_weight_tensor_strategy(
+    weight: torch.Tensor,
+    weight_scale: torch.Tensor,
+    logical_widths: list[int],
+    input_scale: Optional[torch.Tensor] = None
+) -> tuple[torch.Tensor, torch.Tensor, Optional[torch.Tensor]]:
+    """Process weights for tensor-wise quantization strategy."""
+    from vllm.model_executor.layers.quantization.utils.w8a8_utils import (
+        normalize_e4m3fn_to_e4m3fnuz, requantize_with_max_scale)
+
+    if current_platform.is_fp8_fnuz():
+        weight, weight_scale, input_scale = normalize_e4m3fn_to_e4m3fnuz(
+            weight=weight, weight_scale=weight_scale, input_scale=input_scale)
+
+    # Requantize with max scale
+    weight_scale, weight = requantize_with_max_scale(
+        weight=weight,
+        weight_scale=weight_scale,
+        logical_widths=logical_widths,
+    )
+
+    weight = _maybe_pad_fp8_weight(weight)
+    return weight, weight_scale, input_scale
+
+
+def process_fp8_weight_channel_strategy(
+    weight: torch.Tensor,
+    weight_scale: torch.Tensor,
+    input_scale: Optional[torch.Tensor] = None
+) -> tuple[torch.Tensor, torch.Tensor, Optional[torch.Tensor]]:
+    """Process weights for channel-wise quantization strategy."""
+    from vllm.model_executor.layers.quantization.utils.w8a8_utils import (
+        normalize_e4m3fn_to_e4m3fnuz)
+
+    if current_platform.is_fp8_fnuz():
+        weight, weight_scale, input_scale = normalize_e4m3fn_to_e4m3fnuz(
+            weight=weight, weight_scale=weight_scale, input_scale=input_scale)
+
+    return weight, weight_scale, input_scale
+
+
+def process_fp8_weight_block_strategy(
+    weight: torch.Tensor,
+    weight_scale: torch.Tensor,
+) -> tuple[torch.Tensor, torch.Tensor]:
+    """Process weights for block-wise quantization strategy."""
+    from vllm.model_executor.layers.quantization.utils.w8a8_utils import (
+        normalize_e4m3fn_to_e4m3fnuz)
+
+    if current_platform.is_fp8_fnuz():
+        weight, weight_scale, _ = normalize_e4m3fn_to_e4m3fnuz(
+            weight=weight, weight_scale=weight_scale)
+
+    weight = _maybe_pad_fp8_weight(weight)
+    return weight, weight_scale
+
+
+def maybe_post_process_fp8_weight_block(layer: torch.nn.Module,
+                                        cutlass_block_fp8_supported: bool):
+    assert layer.weight_block_size is not None
+
+    from vllm.utils.deep_gemm import (is_deep_gemm_e8m0_used,
+                                      should_use_deepgemm_for_fp8_linear)
+
+    # On Blackwell or Hopper, if E8M0 for DeepGemm is used, we need to
+    # requantize the weight and input to the specific scale
+    # at the same time.
+    if is_deep_gemm_e8m0_used():
+        block_sz = tuple(layer.weight_block_size)
+        requant_weight_ue8m0_inplace(layer.weight.data,
+                                     layer.weight_scale.data, block_sz)
+    # SM90 Block FP8 CUTLASS requires row-major weight scales
+    elif (current_platform.is_device_capability(90)
+          and cutlass_block_fp8_supported
+          and not should_use_deepgemm_for_fp8_linear(torch.bfloat16,
+                                                     layer.weight)):
+        layer.weight_scale = torch.nn.Parameter(
+            layer.weight_scale.data.T.contiguous(), requires_grad=False)
+
+
+def apply_fp8_block_linear(layer: torch.nn.Module, input: torch.Tensor,
+                           bias: Optional[torch.Tensor],
+                           cutlass_block_fp8_supported: bool,
+                           use_aiter_and_is_supported: bool) -> torch.Tensor:
+    """Apply block-wise FP8 linear operation."""
+    assert layer.weight_block_size is not None
+
+    return torch.ops.vllm.apply_w8a8_block_fp8_linear(
+        input=input,
+        weight=layer.weight,
+        block_size=layer.weight_block_size,
+        weight_scale=layer.weight_scale,
+        input_scale=layer.input_scale,
+        bias=bias,
+        cutlass_block_fp8_supported=cutlass_block_fp8_supported,
+        use_aiter_and_is_supported=use_aiter_and_is_supported,
+    )