[Misc] Pass attention to impl backend

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm/attention/backends/abstract.py

@@ -244,13 +244,12 @@ def __init__(
     @abstractmethod
     def forward(
         self,
+        layer: torch.nn.Module,
         query: torch.Tensor,
         key: torch.Tensor,
         value: torch.Tensor,
         kv_cache: torch.Tensor,
         attn_metadata: T,
-        k_scale: float = 1.0,
-        v_scale: float = 1.0,
         output: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
         raise NotImplementedError

vllm/attention/backends/blocksparse_attn.py

@@ -358,13 +358,12 @@ def __init__(
 
     def forward(
         self,
+        layer: torch.nn.Module,
         query: torch.Tensor,
         key: torch.Tensor,
         value: torch.Tensor,
         kv_cache: torch.Tensor,
         attn_metadata: BlocksparseFlashAttentionMetadata,
-        k_scale: float = 1.0,
-        v_scale: float = 1.0,
         output: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
         """Forward pass with FlashAttention and PagedAttention.
@@ -401,8 +400,8 @@ def forward(
                 value_cache,
                 attn_metadata.slot_mapping,
                 self.kv_cache_dtype,
-                k_scale,
-                v_scale,
+                layer._k_scale,
+                layer._v_scale,
             )
 
         if prefill_meta := attn_metadata.prefill_metadata:
@@ -439,8 +438,8 @@ def forward(
                 self.num_kv_heads,
                 self.scale,
                 self.alibi_slopes,
-                k_scale,
-                v_scale,
+                layer._k_scale,
+                layer._v_scale,
                 tp_rank=self.tp_rank,
                 blocksparse_local_blocks=self.local_blocks,
                 blocksparse_vert_stride=self.vert_stride,

vllm/attention/backends/flash_attn.py

@@ -634,13 +634,12 @@ def __init__(
 
     def forward(
         self,
+        layer: torch.nn.Module,
         query: torch.Tensor,
         key: torch.Tensor,
         value: torch.Tensor,
         kv_cache: torch.Tensor,
         attn_metadata: FlashAttentionMetadata,
-        k_scale: float = 1.0,
-        v_scale: float = 1.0,
         output: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
         """Forward pass with FlashAttention.
@@ -657,7 +656,7 @@ def forward(
         NOTE: It in-place updates the output tensor.
         """
         # NOTE(woosuk): FlashAttention does not support FP8 KV cache.
-        assert k_scale == 1.0 and v_scale == 1.0, (
+        assert layer._k_scale == 1.0 and layer._v_scale == 1.0, (
             "key/v_scale is not supported in FlashAttention.")
 
         assert output is not None, "Output tensor must be provided."
@@ -709,8 +708,8 @@ def forward(
                     kv_cache[1],
                     updated_slot_mapping.flatten(),  # type: ignore[union-attr]
                     kv_cache_dtype,
-                    k_scale,
-                    v_scale,
+                    layer._k_scale,
+                    layer._v_scale,
                 )
 
         (num_prefill_query_tokens, num_prefill_kv_tokens,

vllm/attention/backends/flashinfer.py

@@ -792,13 +792,12 @@ def __init__(
 
     def forward(
         self,
+        layer: torch.nn.Module,
         query: torch.Tensor,
         key: torch.Tensor,
         value: torch.Tensor,
         kv_cache: torch.Tensor,
         attn_metadata: FlashInferMetadata,
-        k_scale: float = 1.0,
-        v_scale: float = 1.0,
         output: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
 
@@ -826,8 +825,8 @@ def forward(
                 kv_cache[:, 1],
                 attn_metadata.slot_mapping.flatten(),
                 kv_cache_dtype,
-                k_scale,
-                v_scale,
+                layer._k_scale,
+                layer._v_scale,
             )
             # The FlashInfer api requires data to be in fp8_e4m3 or fp8_e5m2
             # to process the cache when the kv_cache_dtype is fp8
@@ -886,8 +885,8 @@ def forward(
                     kv_cache,
                     logits_soft_cap=logits_soft_cap,
                     causal=True,
-                    k_scale=k_scale,
-                    v_scale=v_scale,
+                    k_scale=layer._k_scale,
+                    v_scale=layer._v_scale,
                     window_left=window_left)
         if decode_meta := attn_metadata.decode_metadata:
             assert decode_meta is not None
@@ -897,8 +896,8 @@ def forward(
                 kv_cache,
                 sm_scale=softmax_scale,
                 logits_soft_cap=logits_soft_cap,
-                k_scale=k_scale,
-                v_scale=v_scale,
+                k_scale=layer._k_scale,
+                v_scale=layer._v_scale,
                 window_left=window_left)
 
         if prefill_output is None and decode_output is not None:

vllm/attention/backends/hpu_attn.py

@@ -152,13 +152,12 @@ def __init__(
 
     def forward(
         self,
+        layer: torch.nn.Module,
         query: torch.Tensor,
         key: torch.Tensor,
         value: torch.Tensor,
         kv_cache: torch.Tensor,
         attn_metadata: HPUAttentionMetadata,
-        k_scale: float = 1.0,
-        v_scale: float = 1.0,
         output: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
         """Forward pass with xFormers and PagedAttention.

vllm/attention/backends/ipex_attn.py

@@ -171,13 +171,12 @@ def split_kv_cache(
 
     def forward(
         self,
+        layer: torch.nn.Module,
         query: torch.Tensor,
         key: torch.Tensor,
         value: torch.Tensor,
         kv_cache: torch.Tensor,
         attn_metadata: IpexAttnMetadata,  # type: ignore
-        k_scale: float = 1.0,
-        v_scale: float = 1.0,
         output: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
         """Forward pass with IPEX varlen_attention and PagedAttention.
@@ -193,7 +192,7 @@ def forward(
         Returns:
             shape = [num_tokens, num_heads * head_size]
         """
-        assert k_scale == 1.0 and v_scale == 1.0
+        assert layer._k_scale == 1.0 and layer._v_scale == 1.0
         num_tokens, hidden_size = query.shape
         # Reshape the query, key, and value tensors.
         query = query.view(-1, self.num_heads, self.head_size)
@@ -210,8 +209,8 @@ def forward(
                 value_cache,
                 attn_metadata.slot_mapping.flatten(),
                 self.kv_cache_dtype,
-                k_scale,
-                v_scale,
+                layer._k_scale,
+                layer._v_scale,
             )
 
         if attn_metadata.is_prompt:
@@ -296,8 +295,8 @@ def forward(
                     max_seq_len,
                     self.alibi_slopes,
                     self.kv_cache_dtype,
-                    k_scale,
-                    v_scale,
+                    layer._k_scale,
+                    layer._v_scale,
                 )
             else:
                 # Run PagedAttention V2.
@@ -329,8 +328,8 @@ def forward(
                     max_seq_len,
                     self.alibi_slopes,
                     self.kv_cache_dtype,
-                    k_scale,
-                    v_scale,
+                    layer._k_scale,
+                    layer._v_scale,
                 )
 
             # Reshape the output tensor.

vllm/attention/backends/pallas.py

@@ -150,13 +150,12 @@ def __init__(
 
     def forward(
         self,
+        layer: torch.nn.Module,
         query: torch.Tensor,
         key: torch.Tensor,
         value: torch.Tensor,
         kv_cache: Tuple[torch.Tensor, torch.Tensor],
         attn_metadata: PallasMetadata,
-        k_scale: float = 1.0,
-        v_scale: float = 1.0,
         output: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
         """Forward pass with Pallas attention.
@@ -173,7 +172,7 @@ def forward(
         Returns:
             shape = [batch_size, seq_len, num_heads * head_size]
         """
-        assert k_scale == 1.0 and v_scale == 1.0
+        assert layer._k_scale == 1.0 and layer._v_scale == 1.0
         batch_size, seq_len, hidden_size = query.shape
         query = query.view(batch_size, seq_len, self.num_heads, self.head_size)
         key = key.view(batch_size, seq_len, self.num_kv_heads, self.head_size)

vllm/attention/backends/rocm_flash_attn.py

@@ -414,13 +414,12 @@ def repeat_kv(self, x: torch.Tensor, n_rep: int) -> torch.Tensor:
 
     def forward(
         self,
+        layer: torch.nn.Module,
         query: torch.Tensor,
         key: torch.Tensor,
         value: torch.Tensor,
         kv_cache: torch.Tensor,
         attn_metadata: ROCmFlashAttentionMetadata,
-        k_scale: float = 1.0,
-        v_scale: float = 1.0,
         output: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
         """Forward pass with FlashAttention and PagedAttention.
@@ -458,8 +457,8 @@ def forward(
                 value_cache,
                 attn_metadata.slot_mapping,
                 self.kv_cache_dtype,
-                k_scale,
-                v_scale,
+                layer._k_scale,
+                layer._v_scale,
             )
 
         num_prefill_tokens = attn_metadata.num_prefill_tokens
@@ -567,8 +566,8 @@ def forward(
                     prefill_meta.max_query_len,
                     self.alibi_slopes,
                     self.sliding_window[0],
-                    k_scale,
-                    v_scale,
+                    layer._k_scale,
+                    layer._v_scale,
                 )
 
         if decode_meta := attn_metadata.decode_metadata:
@@ -613,8 +612,8 @@ def forward(
                     max_seq_len,
                     self.alibi_slopes,
                     self.kv_cache_dtype,
-                    k_scale,
-                    v_scale,
+                    layer._k_scale,
+                    layer._v_scale,
                 )
             else:
                 output[num_prefill_tokens:] = PagedAttention.forward_decode(
@@ -628,8 +627,8 @@ def forward(
                     self.num_kv_heads,
                     self.scale,
                     self.alibi_slopes,
-                    k_scale,
-                    v_scale,
+                    layer._k_scale,
+                    layer._v_scale,
                 )
 
         # Reshape the output tensor.

vllm/attention/backends/torch_sdpa.py

@@ -429,13 +429,12 @@ def __init__(
 
     def forward(
         self,
+        layer: torch.nn.Module,
         query: torch.Tensor,
         key: torch.Tensor,
         value: torch.Tensor,
         kv_cache: torch.Tensor,
         attn_metadata: TorchSDPAMetadata,  # type: ignore
-        k_scale: float = 1.0,
-        v_scale: float = 1.0,
         output: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
         """Forward pass with torch SDPA and PagedAttention.
@@ -451,7 +450,7 @@ def forward(
         Returns:
             shape = [num_tokens, num_heads * head_size]
         """
-        assert k_scale == 1.0 and v_scale == 1.0
+        assert layer._k_scale == 1.0 and layer._v_scale == 1.0
         attn_type = self.attn_type
         if (attn_type == AttentionType.ENCODER
                 and (not attn_metadata.is_all_encoder_attn_metadata_set)):
@@ -493,11 +492,9 @@ def forward(
                     # Update self-attention KV cache (prefill/decode)
                     updated_slot_mapping = attn_metadata.slot_mapping
 
-                PagedAttention.write_to_paged_cache(key, value, key_cache,
-                                                    value_cache,
-                                                    updated_slot_mapping,
-                                                    self.kv_cache_dtype,
-                                                    k_scale, v_scale)
+                PagedAttention.write_to_paged_cache(
+                    key, value, key_cache, value_cache, updated_slot_mapping,
+                    self.kv_cache_dtype, layer._k_scale, layer._v_scale)
 
         if attn_type != AttentionType.ENCODER:
             # Decoder self-attention supports chunked prefill.
@@ -571,8 +568,8 @@ def forward(
                 self.num_kv_heads,
                 self.scale,
                 self.alibi_slopes,
-                k_scale,
-                v_scale,
+                layer._k_scale,
+                layer._v_scale,
             )
 
         # Reshape the output tensor.

vllm/attention/backends/xformers.py

@@ -412,13 +412,12 @@ def __init__(
 
     def forward(
         self,
+        layer: torch.nn.Module,
         query: torch.Tensor,
         key: Optional[torch.Tensor],
         value: Optional[torch.Tensor],
         kv_cache: torch.Tensor,
         attn_metadata: "XFormersMetadata",
-        k_scale: float = 1.0,
-        v_scale: float = 1.0,
         output: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
         """Forward pass with xFormers and PagedAttention.
@@ -524,11 +523,9 @@ def forward(
                 # If kv_cache is not provided, the new key and value tensors are
                 # not cached. This happens during the initial memory
                 # profiling run.
-                PagedAttention.write_to_paged_cache(key, value, key_cache,
-                                                    value_cache,
-                                                    updated_slot_mapping,
-                                                    self.kv_cache_dtype,
-                                                    k_scale, v_scale)
+                PagedAttention.write_to_paged_cache(
+                    key, value, key_cache, value_cache, updated_slot_mapping,
+                    self.kv_cache_dtype, layer._k_scale, layer._v_scale)
         (num_prefill_query_tokens, num_prefill_kv_tokens,
         num_decode_query_tokens) = \
             get_num_prefill_decode_query_kv_tokens(attn_metadata, attn_type)
@@ -580,8 +577,8 @@ def forward(
                     prefill_meta.max_query_len,
                     self.alibi_slopes,
                     self.sliding_window,
-                    k_scale,
-                    v_scale,
+                    layer._k_scale,
+                    layer._v_scale,
                 )
                 assert output[:num_prefill_query_tokens].shape == out.shape
                 output[:num_prefill_query_tokens] = out
@@ -607,8 +604,8 @@ def forward(
                 self.num_kv_heads,
                 self.scale,
                 self.alibi_slopes,
-                k_scale,
-                v_scale,
+                layer._k_scale,
+                layer._v_scale,
             )
 
         # Reshape the output tensor.