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Potential API change #2326

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3d049de
[Ai-assisted] CLC work stealing
drisspg Mar 9, 2026
9e1a3f5
Potential API change
drisspg Mar 10, 2026
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1 change: 1 addition & 0 deletions flash_attn/cute/block_sparsity.py
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Original file line number Diff line number Diff line change
Expand Up @@ -401,6 +401,7 @@ def to_cute_block_sparse_tensors(
"""Convert torch block sparsity tensors to CuTe tensors, optionally for tvm ffi"""
if not is_block_sparsity_enabled(tensors):
return None

(
mask_block_cnt,
mask_block_idx,
Expand Down
231 changes: 189 additions & 42 deletions flash_attn/cute/flash_fwd_sm100.py
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17 changes: 14 additions & 3 deletions flash_attn/cute/interface.py
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Original file line number Diff line number Diff line change
Expand Up @@ -209,6 +209,7 @@ def _flash_attn_fwd(
out: Optional[torch.Tensor] = None,
lse: Optional[torch.Tensor] = None,
aux_tensors: Optional[list[torch.Tensor]] = None,
sched_stages: int = 1,
) -> Tuple[torch.Tensor, torch.Tensor]:
"""Forward pass for FlashAttention.

Expand Down Expand Up @@ -339,6 +340,9 @@ def _flash_attn_fwd(
causal, window_size_left, window_size_right, mask_mod
)

requested_use_clc_scheduler = utils._get_use_clc_scheduler_default()
requested_disable_2cta = utils._get_disable_2cta_default()

current_stream = cuda.CUstream(torch.cuda.current_stream().cuda_stream)

fwd_cfg = FwdConfig(128, 128, True, True) # default
Expand Down Expand Up @@ -393,6 +397,7 @@ def _flash_attn_fwd(

use_2cta_instrs = (
arch // 10 in [10, 11]
and not requested_disable_2cta
and not causal
and not local
and not is_split_kv
Expand Down Expand Up @@ -496,6 +501,8 @@ def _flash_attn_fwd(
q_subtile_factor,
mma_pv_is_rs,
intra_wg_overlap,
requested_use_clc_scheduler,
sched_stages,
fa_logging.get_fa_log_level(),
)
if compile_key not in _flash_attn_fwd.compile_cache:
Expand Down Expand Up @@ -569,8 +576,8 @@ def _flash_attn_fwd(
is_local=local,
is_split_kv=is_split_kv,
pack_gqa=pack_gqa,
tile_m=tile_m,
tile_n=tile_n,
m_block_size=tile_m,
n_block_size=tile_n,
q_stage=q_stage,
is_persistent=not causal
and not local
Expand All @@ -582,6 +589,8 @@ def _flash_attn_fwd(
has_aux_tensors=aux_tensors is not None,
paged_kv_non_tma=page_size not in [None, 128],
is_varlen_q=cu_seqlens_q is not None or seqused_q is not None,
use_clc_scheduler=requested_use_clc_scheduler,
sched_stages=sched_stages,
q_subtile_factor=q_subtile_factor,
use_2cta_instrs=use_2cta_instrs,
)
Expand Down Expand Up @@ -811,8 +820,10 @@ def _flash_attn_bwd(
dKV_swapAB = False
AtomLayoutMdQ = 1
AtomLayoutNdKV = 1
requested_disable_2cta = utils._get_disable_2cta_default()
disable_2cta = (
local
requested_disable_2cta
or local
or score_mod is not None
or score_mod_bwd is not None
or mask_mod is not None
Expand Down
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