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[Bugfix] fix the bug of the flash_attention in Qwen3-Next

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This commit is contained in:
ldh2020
2025-12-21 10:34:43 +08:00
committed by GitHub
parent 911b886e9d
commit 58c1db5073
1 changed files with 8 additions and 2 deletions
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10
vllm_kunlun/v1/attention/backends/kunlun_attn.py
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@@ -673,6 +673,12 @@ class KunlunAttentionImpl(AttentionImpl[KunlunMetadata]):
if prefill_meta := attn_metadata.prefill_metadata:
# Prompt run.
prefill_query = query[num_decode_tokens:attn_metadata.num_actual_tokens]
if key_cache.is_contiguous():
tmp_block_tables = prefill_meta.block_tables
else:
tmp_block_tables = prefill_meta.block_tables * 2 # only test in Qwen3-Next
xtorch_ops.prefill_attention(
q=prefill_query,
k=key_cache, # Key Cache (block_num, head, block_size, dim)
@@ -680,7 +686,7 @@ class KunlunAttentionImpl(AttentionImpl[KunlunMetadata]):
out=output[num_decode_tokens:attn_metadata.num_actual_tokens],
is_causal=True,
is_prefix_cache=True,
block_table=prefill_meta.block_tables,
block_table=tmp_block_tables,
context_qlen_lod_cpu=prefill_meta.query_start_loc_host,
context_qlen_lod_xpu=prefill_meta.query_start_loc,
context_kvlen_lod_cpu=prefill_meta.kv_lod_cpu,
@@ -782,4 +788,4 @@ def use_cascade_attention(
flash_decoding_time = cdiv(flash_decoding_ctas, num_sms)
# Use cascade attention if it is faster than FlashDecoding.
return cascade_time < flash_decoding_time
return cascade_time < flash_decoding_time