update flashinfer to v0.2.9rc1 (#21485)

Signed-off-by: Weiliang Liu <weiliangl@nvidia.com>

docker/Dockerfile

@@ -386,7 +386,7 @@ RUN --mount=type=bind,from=build,src=/workspace/dist,target=/vllm-workspace/dist
 
 # Install FlashInfer from source
 ARG FLASHINFER_GIT_REPO="https://github.com/flashinfer-ai/flashinfer.git"
-ARG FLASHINFER_GIT_REF="v0.2.8"
+ARG FLASHINFER_GIT_REF="v0.2.9rc1"
 RUN --mount=type=cache,target=/root/.cache/uv bash - <<'BASH'
   . /etc/environment
     git clone --depth 1 --recursive --shallow-submodules \

vllm/attention/backends/flashinfer.py

@@ -1169,16 +1169,12 @@ class FlashInferImpl(AttentionImpl):
                     query=decode_query,
                     kv_cache=kv_cache.permute(*stride_order),
                     workspace_buffer=workspace_buffer,
-                    num_heads=num_heads,
-                    num_kv_heads=num_kv_heads,
-                    scale=softmax_scale,
                     block_tables=attn_metadata.block_tables,
                     seq_lens=decode_meta.seq_lens_tensor,
-                    block_size=attn_metadata.page_size,
                     max_seq_len=attn_metadata.max_decode_seq_len,
-                    kv_cache_dtype=kv_cache_dtype,
-                    k_scale=layer._k_scale_float,
-                    v_scale=layer._v_scale_float)
+                    bmm1_scale=layer._k_scale_float * softmax_scale,
+                    bmm2_scale=layer._v_scale_float,
+                )
 
         if prefill_output is None and decode_output is not None:
             # Decode only batch.

vllm/v1/attention/backends/flashinfer.py

@@ -678,15 +678,10 @@ class FlashInferImpl(AttentionImpl):
                             query=decode_query,
                             kv_cache=kv_cache_permute,
                             workspace_buffer=attn_metadata.workspace_buffer,
-                            num_heads=self.num_heads,
-                            num_kv_heads=self.num_kv_heads,
-                            scale=self.scale,
                             block_tables=block_tables_decode,
                             seq_lens=seq_lens_decode,
-                            block_size=attn_metadata.page_size,
                             max_seq_len=attn_metadata.max_seq_len,
-                            kv_cache_dtype=self.kv_cache_dtype,
-                            k_scale=layer._k_scale_float,
-                            v_scale=layer._v_scale_float,
+                            bmm1_scale=layer._k_scale_float * self.scale,
+                            bmm2_scale=layer._v_scale_float,
                         ))
         return output_padded