| from typing import Optional | |
| import cutlass | |
| import cutlass.cute as cute | |
| """ | |
| This consolidates all the info related to sequence length. This is so that we can do all | |
| the gmem reads once at the beginning of each tile, rather than having to repeat these reads | |
| to compute various things like n_block_min, n_block_max, etc. | |
| """ | |
| class SeqlenInfo: | |
| def __init__( | |
| self, | |
| batch_idx: cutlass.Int32, | |
| seqlen_static: cutlass.Int32, | |
| cu_seqlens: Optional[cute.Tensor] = None, | |
| seqused: Optional[cute.Tensor] = None, | |
| ): | |
| self.offset = 0 if cutlass.const_expr(cu_seqlens is None) else cu_seqlens[batch_idx] | |
| if cutlass.const_expr(seqused is not None): | |
| self.seqlen = seqused[batch_idx] | |
| elif cutlass.const_expr(cu_seqlens is not None): | |
| self.seqlen = cu_seqlens[batch_idx + 1] - cu_seqlens[batch_idx] | |
| else: | |
| self.seqlen = seqlen_static | |
| class SeqlenInfoQK: | |
| def __init__( | |
| self, | |
| batch_idx: cutlass.Int32, | |
| seqlen_q_static: cutlass.Int32, | |
| seqlen_k_static: cutlass.Int32, | |
| mCuSeqlensQ: Optional[cute.Tensor] = None, | |
| mCuSeqlensK: Optional[cute.Tensor] = None, | |
| mSeqUsedQ: Optional[cute.Tensor] = None, | |
| mSeqUsedK: Optional[cute.Tensor] = None, | |
| ): | |
| self.offset_q = 0 if cutlass.const_expr(mCuSeqlensQ is None) else mCuSeqlensQ[batch_idx] | |
| self.offset_k = 0 if cutlass.const_expr(mCuSeqlensK is None) else mCuSeqlensK[batch_idx] | |
| if cutlass.const_expr(mSeqUsedQ is not None): | |
| self.seqlen_q = mSeqUsedQ[batch_idx] | |
| else: | |
| self.seqlen_q = ( | |
| seqlen_q_static | |
| if cutlass.const_expr(mCuSeqlensQ is None) | |
| else mCuSeqlensQ[batch_idx + 1] - self.offset_q | |
| ) | |
| if cutlass.const_expr(mSeqUsedK is not None): | |
| self.seqlen_k = mSeqUsedK[batch_idx] | |
| else: | |
| self.seqlen_k = ( | |
| seqlen_k_static | |
| if cutlass.const_expr(mCuSeqlensK is None) | |
| else mCuSeqlensK[batch_idx + 1] - self.offset_k | |
| ) | |
| self.has_cu_seqlens_q: int = mCuSeqlensQ is not None | |
| self.has_cu_seqlens_k: int = mCuSeqlensK is not None | |