biondizzle
fbc5f6f9da
Step 1: Hash router (hash_router.cu) - One thread per token, gather from [vocab_size, k] LUT - Uniform 1/k weights, FP32 output - 3 MB LUT fits in L2 for repeated decode calls Step 2: topk_select.cu — general top-k primitive - Per-thread register min-heap (k=6, compile-time unrolled) - Shared memory merge: thread 0 merges 64 partial heaps - Tie-breaking: lower index wins on equal scores - Reusable by CSA indexer Step 3: activation_topk.cu — fused sqrt(softplus) + bias + topk + renorm - Single kernel: all 6 steps of the router math, no intermediate buffers - Numerically stable softplus: max(x,0) + log1p(exp(-|x|)) - Per-thread heap with unbiased activation co-stored - Shared memory merge → sort descending → renormalize → store Step 4: dense_router_decode.py — CuTeDSL fused GEMM kernel (skeleton) - BF16 GEMM with tcgen05.mma, FP32 accumulator - Custom epilogue: activation + bias + top-k (structure defined, needs TMA/MMA boilerplate) - Dispatch: N<=64 uses fused decode, N>64 uses prefill path Step 5: dense_router_prefill.py — prefill path - torch.nn.functional.linear for GEMM (DeepGEMM integration deferred) - Calls activation_topk for fused post-GEMM processing Step 6: Router class + ops/router.py + test_router.py - Router: construction-time mode (dense/hash), weight loading, custom_op dispatch - ops/router.py: torch.library.custom_op wrappers, integer-keyed registry - test_router.py: spec oracle tests (DO NOT RUN — Carmine is testing Stage C) Test strategy: each kernel tested against its mathematical spec in FP32. No reference implementation, no two debug streams. The oracle IS the math.
461 lines
29 KiB
Python
461 lines
29 KiB
Python
"""
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FMHA v3 Stage C: Production architecture with correction warp group.
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4 softmax warps (0-3), 4 correction warps (4-7), 1 MMA warp (8), 1 TMA warp (9).
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10 warps = 320 threads.
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Softmax warps: QK→softmax, write P, write row metadata to TMEM vector.
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Correction warps: read row metadata, rescale O (C6), final normalize (C9).
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MMA warp: QK GEMM, PV GEMM.
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TMA warp: load Q, K, V.
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"""
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import math
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import torch, cutlass, cutlass.cute as cute, cutlass.utils as utils, cutlass.pipeline as pipeline
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from cutlass.cute.nvgpu import cpasync, tcgen05
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from cutlass import Float32, BFloat16, Int32, Boolean, const_expr
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from cutlass.utils import LayoutEnum
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from cutlass.utils.tmem_allocator import find_tmem_tensor_col_offset
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import cuda.bindings.driver as cuda
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import cutlass.torch as ct
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HEAD_DIM = 64
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class FmhaV3Correction:
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def __init__(self, s_k: int = 128):
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self.s_k = s_k
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self.acc_dtype = Float32; self.qk_acc_dtype = Float32; self.pv_acc_dtype = Float32
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self.q_dtype = BFloat16; self.o_dtype = BFloat16; self.c_dtype = BFloat16
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self.use_2cta_instrs = False; self.epilog_sync_bar_id = 1
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self.cluster_shape_mn = (1, 1); self.cta_group = tcgen05.CtaGroup.ONE
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self.softmax_warp_ids = (0, 1, 2, 3)
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self.correction_warp_ids = (4, 5, 6, 7)
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self.epilogue_warp_id = (4,5,6,7)
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self.mma_warp_id = 8
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self.tma_warp_id = 9
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self.threads_per_warp = 32
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self.threads_per_cta = 320
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self.num_c_stage = 2
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self.kv_stage = 2; self.q_stage = 1
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self.tmem_s0_offset = 0
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self.tmem_p0_offset = 32
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# Vector at dedicated offset (after O) - no aliasing with S/P
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self.tmem_vec0_offset = None # computed in _setup after tmem_o0_offset
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self.scale_softmax_log2 = Float32(1.0 / math.sqrt(HEAD_DIM) * math.log2(math.e))
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self.scale_softmax = Float32(1.0 / math.sqrt(HEAD_DIM))
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def _setup(self, qk_mma, pv_mma):
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qk_ik = cute.size(qk_mma.shape_mnk, mode=[2])
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self.qk_mma_tiler = (128, 128, qk_ik * 4)
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pv_ik = cute.size(pv_mma.shape_mnk, mode=[2])
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self.pv_mma_tiler = (128, HEAD_DIM, pv_ik * (128 // pv_ik))
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self.mma_tiler = self.qk_mma_tiler
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self.cluster_layout_vmnk = cute.tiled_divide(cute.make_layout((1,1,1)), (qk_mma.thr_id.shape,))
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self.cta_tile_shape_mnk = (self.qk_mma_tiler[0]//cute.size(qk_mma.thr_id.shape), HEAD_DIM, self.qk_mma_tiler[2])
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self.c_layout = LayoutEnum.ROW_MAJOR
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self.epi_tile = utils.sm100.compute_epilogue_tile_shape(self.cta_tile_shape_mnk, False, self.c_layout, self.o_dtype)
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self.num_ab_stage = 1; self.num_acc_stage = 1
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self.q_smem_s = utils.sm100.make_smem_layout_a(qk_mma, self.qk_mma_tiler, self.q_dtype, self.q_stage)
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self.k_smem_s = utils.sm100.make_smem_layout_b(qk_mma, self.qk_mma_tiler, self.q_dtype, self.kv_stage)
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self.v_smem_s = utils.sm100.make_smem_layout_b(pv_mma, self.pv_mma_tiler, self.q_dtype, self.kv_stage)
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self.c_smem_s = utils.sm100.make_smem_layout_epi(self.o_dtype, self.c_layout, self.epi_tile, 2)
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self.p_tmem_s = utils.sm100.make_smem_layout_a(pv_mma, self.pv_mma_tiler, self.q_dtype, 1)
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qk_thr = qk_mma.get_slice(0); qk_as = qk_thr.partition_shape_C(self.qk_mma_tiler[:2])
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tStS = qk_thr.make_fragment_C(qk_as)
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pv_thr = pv_mma.get_slice(0); pv_as = pv_thr.partition_shape_C(self.pv_mma_tiler[:2])
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tOtO = pv_thr.make_fragment_C(pv_as)
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p_cols_fp32 = self.pv_mma_tiler[2] * self.q_dtype.width // self.qk_acc_dtype.width
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p_end = self.tmem_p0_offset + p_cols_fp32
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o_after = max(self.qk_mma_tiler[1], p_end)
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self.tmem_o0_offset = ((o_after + 31) // 32) * 32
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o_cols = find_tmem_tensor_col_offset(tOtO)
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total = self.tmem_o0_offset + o_cols
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# Vector region: 2 FP32 cols per row, align to 32
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self.tmem_vec0_offset = ((total + 31) // 32) * 32
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vec_alloc = self.tmem_vec0_offset + 32
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self.num_tmem_alloc_cols = 1
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while self.num_tmem_alloc_cols < vec_alloc: self.num_tmem_alloc_cols *= 2
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cta = cute.size(qk_mma.thr_id.shape)
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q_s = cute.slice_(self.q_smem_s,(None,None,None,0)); k_s = cute.slice_(self.k_smem_s,(None,None,None,0))
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self.q_tx_bytes = cute.size_in_bytes(self.q_dtype, q_s) * cta
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self.kv_tx_bytes = cute.size_in_bytes(self.q_dtype, k_s) * cta
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@cute.jit
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def __call__(self, q, k, v, c, stream):
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self.q_dtype = q.element_type; self.o_dtype = c.element_type; self.c_dtype = self.o_dtype
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self.a_major = LayoutEnum.from_tensor(q).mma_major_mode()
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self.b_major = LayoutEnum.from_tensor(k).mma_major_mode()
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v_fmha = cute.make_tensor(v.iterator, cute.make_layout((HEAD_DIM, self.s_k, 1), stride=(1, HEAD_DIM, HEAD_DIM * self.s_k)))
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self.v_major = LayoutEnum.from_tensor(v_fmha).mma_major_mode()
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self.c_layout = LayoutEnum.from_tensor(c)
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qk_mma = utils.sm100.make_trivial_tiled_mma(self.q_dtype, self.q_dtype, self.a_major, self.b_major, self.qk_acc_dtype, self.cta_group, (128,128), tcgen05.OperandSource.SMEM)
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pv_mma = utils.sm100.make_trivial_tiled_mma(self.q_dtype, self.q_dtype, cute.nvgpu.OperandMajorMode.K, self.v_major, self.qk_acc_dtype, self.cta_group, (128,HEAD_DIM), tcgen05.OperandSource.TMEM)
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self._setup(qk_mma, pv_mma)
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q_s = cute.slice_(self.q_smem_s,(None,None,None,0)); k_s = cute.slice_(self.k_smem_s,(None,None,None,0)); v_s = cute.slice_(self.v_smem_s,(None,None,None,0))
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tma_q,mQ = cute.nvgpu.make_tiled_tma_atom_A(utils.sm100.cluster_shape_to_tma_atom_A(self.cluster_shape_mn,qk_mma.thr_id),q,q_s,self.qk_mma_tiler,qk_mma,self.cluster_layout_vmnk.shape)
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tma_k,mK = cute.nvgpu.make_tiled_tma_atom_B(utils.sm100.cluster_shape_to_tma_atom_B(self.cluster_shape_mn,qk_mma.thr_id),k,k_s,self.qk_mma_tiler,qk_mma,self.cluster_layout_vmnk.shape)
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tma_v,mV = cute.nvgpu.make_tiled_tma_atom_B(utils.sm100.cluster_shape_to_tma_atom_B(self.cluster_shape_mn,pv_mma.thr_id),v_fmha,v_s,self.pv_mma_tiler,pv_mma,self.cluster_layout_vmnk.shape)
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epi_s = cute.select(self.c_smem_s,mode=[0,1])
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tma_c,mC = cpasync.make_tiled_tma_atom(cpasync.CopyBulkTensorTileS2GOp(),c,epi_s,self.epi_tile)
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self._kernel(qk_mma,pv_mma,tma_q,mQ,tma_k,mK,tma_v,mV,tma_c,mC,self.cluster_layout_vmnk,self.q_smem_s,self.k_smem_s,self.v_smem_s,self.p_tmem_s,self.c_smem_s,self.epi_tile).launch(grid=(1,1,1),block=[self.threads_per_cta,1,1],stream=stream)
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@cute.kernel
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def _kernel(self, qk_mma, pv_mma, tma_q, mQ, tma_k, mK, tma_v, mV, tma_c, mC, cl_vmnk, q_smem_s, k_smem_s, v_smem_s, p_tmem_s, c_smem_s, epi_tile):
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warp_idx = cute.arch.make_warp_uniform(cute.arch.warp_idx())
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tidx,_,_ = cute.arch.thread_idx()
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is_softmax = warp_idx < 4
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is_correction = warp_idx >= 4 and warp_idx < 8
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is_mma = warp_idx == 8
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is_tma = warp_idx == 9
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if is_tma:
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cpasync.prefetch_descriptor(tma_q); cpasync.prefetch_descriptor(tma_k); cpasync.prefetch_descriptor(tma_v); cpasync.prefetch_descriptor(tma_c)
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@cute.struct
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class SS:
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q_bar: cute.struct.MemRange[cutlass.Int64, self.q_stage*2]
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kv_bar: cute.struct.MemRange[cutlass.Int64, self.kv_stage*2]
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s_bar: cute.struct.MemRange[cutlass.Int64, 2]
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acc_bar: cute.struct.MemRange[cutlass.Int64, self.num_acc_stage*2]
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tmem_dealloc: cutlass.Int64; holding: cutlass.Int32
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smem = utils.SmemAllocator(); st = smem.allocate(SS)
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qp,qc = pipeline.PipelineTmaUmma.create(barrier_storage=st.q_bar.data_ptr(),num_stages=self.q_stage,producer_group=pipeline.CooperativeGroup(pipeline.Agent.Thread),consumer_group=pipeline.CooperativeGroup(pipeline.Agent.Thread,1),tx_count=self.q_tx_bytes,cta_layout_vmnk=cl_vmnk,defer_sync=True).make_participants()
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kvp,kvc = pipeline.PipelineTmaUmma.create(barrier_storage=st.kv_bar.data_ptr(),num_stages=self.kv_stage,producer_group=pipeline.CooperativeGroup(pipeline.Agent.Thread),consumer_group=pipeline.CooperativeGroup(pipeline.Agent.Thread,1),tx_count=self.kv_tx_bytes,cta_layout_vmnk=cl_vmnk,defer_sync=True).make_participants()
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s_prod,s_cons = pipeline.PipelineUmmaAsync.create(barrier_storage=st.s_bar.data_ptr(),num_stages=1,producer_group=pipeline.CooperativeGroup(pipeline.Agent.Thread),consumer_group=pipeline.CooperativeGroup(pipeline.Agent.Thread,32*4)).make_participants()
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softmax_done_bar = pipeline.NamedBarrier(barrier_id=3, num_threads=32*4 + 32*1)
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pv_done_bar = pipeline.NamedBarrier(barrier_id=4, num_threads=32*1 + 32*4)
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corr_done_bar = pipeline.NamedBarrier(barrier_id=6, num_threads=32*4 + 32*1)
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acc_pipe = pipeline.PipelineUmmaAsync.create(barrier_storage=st.acc_bar.data_ptr(),num_stages=self.num_acc_stage,producer_group=pipeline.CooperativeGroup(pipeline.Agent.Thread),consumer_group=pipeline.CooperativeGroup(pipeline.Agent.Thread,4),cta_layout_vmnk=cl_vmnk,defer_sync=True)
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tmem_bar = pipeline.NamedBarrier(barrier_id=2,num_threads=32*(8+1))
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tmem = utils.TmemAllocator(st.holding.ptr,barrier_for_retrieve=tmem_bar,allocator_warp_id=0,is_two_cta=cute.size(qk_mma.thr_id.shape)==2,two_cta_tmem_dealloc_mbar_ptr=st.tmem_dealloc.ptr)
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pipeline.pipeline_init_arrive(cluster_shape_mn=cl_vmnk,is_relaxed=True)
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sQ = smem.allocate_tensor(element_type=self.q_dtype,layout=q_smem_s.outer,byte_alignment=128,swizzle=q_smem_s.inner)
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sK = smem.allocate_tensor(element_type=self.q_dtype,layout=k_smem_s.outer,byte_alignment=128,swizzle=k_smem_s.inner)
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sV = smem.allocate_tensor(element_type=self.q_dtype,layout=v_smem_s.outer,byte_alignment=128,swizzle=v_smem_s.inner)
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sC = smem.allocate_tensor(element_type=self.o_dtype,layout=c_smem_s.outer,byte_alignment=128,swizzle=c_smem_s.inner)
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gQ = cute.local_tile(mQ,cute.slice_(self.qk_mma_tiler,(None,0,None)),(None,None,None))
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gK = cute.local_tile(mK,cute.slice_(self.qk_mma_tiler,(0,None,None)),(None,None,None))
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gV = cute.local_tile(mV,cute.slice_(self.pv_mma_tiler,(0,None,None)),(None,None,None))
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gC = cute.local_tile(mC,cute.slice_(self.pv_mma_tiler,(None,None,0)),(None,None,None))
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n_kv_tiles = cute.size(gK, mode=[3])
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qk_thr = qk_mma.get_slice(0); pv_thr = pv_mma.get_slice(0)
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tCgQ = qk_thr.partition_A(gQ); tCgK = qk_thr.partition_B(gK)
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tCgV = pv_thr.partition_B(gV); tCgC = pv_thr.partition_C(gC)
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a_lay = cute.make_layout(cute.slice_(cl_vmnk,(0,0,None,0)).shape)
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tAsQ,tAgQ = cpasync.tma_partition(tma_q,0,a_lay,cute.group_modes(sQ,0,3),cute.group_modes(tCgQ,0,3))
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b_lay = cute.make_layout(cute.slice_(cl_vmnk,(0,None,0,0)).shape)
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tBsK,tBgK = cpasync.tma_partition(tma_k,0,b_lay,cute.group_modes(sK,0,3),cute.group_modes(tCgK,0,3))
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tVsV,tVgV = cpasync.tma_partition(tma_v,0,b_lay,cute.group_modes(sV,0,3),cute.group_modes(tCgV,0,3))
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tAgQ = tAgQ[(None,0,None,0)]; tBgK = tBgK[(None,0,None,0)]; tVgV = tVgV[(None,0,None,0)]
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tCrQ = qk_mma.make_fragment_A(sQ); tCrK = qk_mma.make_fragment_B(sK)
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tCrV = pv_mma.make_fragment_B(sV)
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qk_as = qk_thr.partition_shape_C(self.qk_mma_tiler[:2])
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tStS = qk_thr.make_fragment_C(qk_as)
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tStS0 = cute.make_tensor(tStS.iterator + self.tmem_s0_offset, tStS.layout)
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pv_as = pv_thr.partition_shape_C(self.pv_mma_tiler[:2])
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tOtO = pv_thr.make_fragment_C(pv_as)
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tOtO0 = cute.make_tensor(tOtO.iterator + self.tmem_o0_offset, tOtO.layout)
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tP = cute.make_tensor(tStS.iterator, p_tmem_s.outer)
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tOrP_base = pv_thr.make_fragment_A(tP)
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tOrP = tOrP_base[(None,None,None,0)]
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tOrP0 = cute.make_tensor(tOrP.iterator + self.qk_acc_dtype.width // self.q_dtype.width * self.tmem_p0_offset, tOrP.layout)
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tCtO_fake = pv_mma.make_fragment_C(cute.append(pv_as, self.num_acc_stage))
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pipeline.pipeline_init_wait(cluster_shape_mn=cl_vmnk)
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# =============== TMA WARP ===============
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if is_tma:
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qp.reset(); qh = qp.acquire_and_advance()
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cute.copy(tma_q,tAgQ[(None,qh.count)],tAsQ[(None,qh.index)],tma_bar_ptr=qh.barrier)
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qp.tail()
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kvp.reset(); pk = kvp.try_acquire()
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for kt in cutlass.range(n_kv_tiles,unroll=1):
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kh = kvp.acquire_and_advance(pk)
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cute.copy(tma_k,tBgK[(None,kh.count)],tBsK[(None,kh.index)],tma_bar_ptr=kh.barrier)
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pk = cutlass.Boolean(1)
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vh = kvp.acquire_and_advance(pk)
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cute.copy(tma_v,tVgV[(None,vh.count)],tVsV[(None,vh.index)],tma_bar_ptr=vh.barrier)
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pk = cutlass.Boolean(1)
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kvp.tail()
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# =============== MMA WARP ===============
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if is_mma:
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tmem.wait_for_alloc()
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qc.reset(); qh = qc.wait_and_advance(); qh.release()
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kvc.reset(); pk = kvc.try_wait()
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acc_st = pipeline.make_pipeline_state(pipeline.PipelineUserType.Producer, self.num_acc_stage)
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acc_pipe.producer_acquire(acc_st)
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for kt in range(n_kv_tiles):
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kh = kvc.wait_and_advance(pk); pk = cutlass.Boolean(1)
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sh = s_prod.acquire_and_advance()
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qk_mma.set(tcgen05.Field.ACCUMULATE, False)
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for kb in cutlass.range(cute.size(tCrQ,mode=[2]), unroll_full=True):
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cute.gemm(qk_mma, tStS0, tCrQ[(None,None,kb,0)], tCrK[(None,None,kb,kh.index)], tStS0)
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qk_mma.set(tcgen05.Field.ACCUMULATE, True)
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cute.arch.fence_view_async_tmem_store()
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sh.commit(); kh.release()
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softmax_done_bar.arrive_and_wait()
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if kt > 0:
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corr_done_bar.arrive_and_wait()
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vh = kvc.wait_and_advance(pk); pk = cutlass.Boolean(1)
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pv_mma.set(tcgen05.Field.ACCUMULATE, kt != 0)
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for kb in cutlass.range(cute.size(tOrP0,mode=[2]), unroll_full=True):
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cute.gemm(pv_mma, tOtO0, tOrP0[(None,None,kb)], tCrV[(None,None,kb,vh.index)], tOtO0)
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pv_mma.set(tcgen05.Field.ACCUMULATE, True)
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cute.arch.fence_view_async_tmem_store()
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vh.release()
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pv_done_bar.arrive()
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acc_pipe.producer_commit(acc_st); acc_st.advance()
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acc_pipe.producer_tail(acc_st)
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# =============== SOFTMAX WARPS (0-3) ===============
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if is_softmax:
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tmem.allocate(self.num_tmem_alloc_cols)
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tmem.wait_for_alloc()
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tmem_ptr = tmem.retrieve_ptr(self.qk_acc_dtype)
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sfw_idx = tidx % (32 * 4)
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# QK S load
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tmem_load_atom = cute.make_copy_atom(tcgen05.copy.Ld32x32bOp(tcgen05.copy.Repetition(32)), self.qk_acc_dtype)
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tiled_tmem_load = tcgen05.make_tmem_copy(tmem_load_atom, tStS0)
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thr_load = tiled_tmem_load.get_slice(sfw_idx)
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tTMEM_LOADtS = thr_load.partition_S(tStS0)
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cS = cute.make_identity_tensor((self.qk_mma_tiler[0], self.qk_mma_tiler[1]))
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tScS = qk_thr.partition_C(cS)
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tTMEM_LOADcS = thr_load.partition_D(tScS)
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# P store
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p_cols_fp32 = self.pv_mma_tiler[2] * self.q_dtype.width // self.qk_acc_dtype.width
|
|
tStP_layout = cute.composition(tStS.layout, cute.make_layout((self.pv_mma_tiler[0], p_cols_fp32)))
|
|
tStP0 = cute.make_tensor(tStS.iterator + self.tmem_p0_offset, tStP_layout)
|
|
tmem_store_atom = cute.make_copy_atom(tcgen05.copy.St32x32bOp(tcgen05.copy.Repetition(32)), self.qk_acc_dtype)
|
|
tiled_tmem_store = tcgen05.make_tmem_copy(tmem_store_atom, tStP0)
|
|
thr_store = tiled_tmem_store.get_slice(sfw_idx)
|
|
tTMEM_STOREtP = thr_store.partition_D(tStP0)
|
|
tScP_layout = cute.composition(tScS.layout, cute.make_layout((self.pv_mma_tiler[0], p_cols_fp32)))
|
|
tScP = cute.make_tensor(tScS.iterator, tScP_layout)
|
|
tTMEM_STOREcP = thr_store.partition_S(tScP)
|
|
|
|
# Vector store (row_max and row_sum via QK partition)
|
|
tStS_vec_layout = cute.composition(tStS.layout, cute.make_layout((128, 2)))
|
|
tStS_vec = cute.make_tensor(tStS.iterator + self.tmem_vec0_offset, tStS_vec_layout)
|
|
tScS_vec_layout = cute.composition(tScS.layout, cute.make_layout((128, 2)))
|
|
tScS_vec = cute.make_tensor(tScS.iterator, tScS_vec_layout)
|
|
tmem_store_vec_atom = cute.make_copy_atom(tcgen05.copy.St32x32bOp(tcgen05.copy.Repetition(2)), self.qk_acc_dtype)
|
|
tiled_tmem_store_vec = tcgen05.make_tmem_copy(tmem_store_vec_atom, tStS_vec)
|
|
thr_tmem_store_vec = tiled_tmem_store_vec.get_slice(sfw_idx)
|
|
tTMEM_STORE_VECtS = thr_tmem_store_vec.partition_D(tStS_vec)
|
|
tTMEM_STORE_VECcS = thr_tmem_store_vec.partition_S(tScS_vec)
|
|
|
|
row_max = -cutlass.Float32.inf
|
|
row_sum = cutlass.Float32(0.0)
|
|
scale = self.scale_softmax_log2
|
|
|
|
for kt in range(n_kv_tiles):
|
|
si_handle = s_cons.wait_and_advance()
|
|
tTMEM_LOADrS = cute.make_rmem_tensor(tTMEM_LOADcS.shape, self.qk_acc_dtype)
|
|
cute.copy(tiled_tmem_load, tTMEM_LOADtS, tTMEM_LOADrS)
|
|
|
|
old_row_max = row_max
|
|
row_max = tTMEM_LOADrS.load().reduce(cute.ReductionOp.MAX, row_max, 0)
|
|
row_max_safe = row_max
|
|
if row_max == -cutlass.Float32.inf:
|
|
row_max_safe = cutlass.Float32(0.0)
|
|
acc_scale = cute.math.exp2(scale * (old_row_max - row_max_safe), fastmath=True)
|
|
row_sum = row_sum * acc_scale
|
|
|
|
# Write old_max and new_max to vector for correction warps
|
|
tTMEM_STORE_VECrS = cute.make_rmem_tensor(tTMEM_STORE_VECcS.shape, self.qk_acc_dtype)
|
|
tTMEM_STORE_VECrS[0] = old_row_max
|
|
tTMEM_STORE_VECrS[1] = row_max_safe
|
|
cute.copy(tiled_tmem_store_vec, tTMEM_STORE_VECrS, tTMEM_STORE_VECtS)
|
|
cute.arch.fence_view_async_tmem_store()
|
|
|
|
# Compute P
|
|
minus_row_max_scale = (cutlass.Float32(0.0) - row_max_safe) * scale
|
|
rP_words = cute.make_rmem_tensor(tTMEM_STOREcP.shape, self.qk_acc_dtype)
|
|
rP_bf16 = cute.make_tensor(cute.recast_ptr(rP_words.iterator, dtype=self.q_dtype), tTMEM_LOADrS.layout)
|
|
frg_cnt = 4
|
|
frg_tile = cute.size(tTMEM_LOADrS) // frg_cnt
|
|
tTMEM_LOADrS_frg = cute.logical_divide(tTMEM_LOADrS, cute.make_layout(frg_tile))
|
|
rP_bf16_frg = cute.logical_divide(rP_bf16, cute.make_layout(frg_tile))
|
|
for j in range(frg_cnt):
|
|
for k in cutlass.range(cute.size(tTMEM_LOADrS_frg, mode=[0]), vectorize=True):
|
|
tTMEM_LOADrS_frg[k, j] = tTMEM_LOADrS_frg[k, j] * scale + minus_row_max_scale
|
|
tTMEM_LOADrS_frg[k, j] = cute.math.exp2(tTMEM_LOADrS_frg[k, j], fastmath=True)
|
|
s_vec = tTMEM_LOADrS_frg[None, j].load()
|
|
rP_bf16_frg[None, j].store(s_vec.to(self.q_dtype))
|
|
cute.copy(tiled_tmem_store, rP_words, tTMEM_STOREtP)
|
|
cute.arch.fence_view_async_tmem_store()
|
|
si_handle.release()
|
|
softmax_done_bar.arrive()
|
|
|
|
# Row sum
|
|
local_row_sum_0 = (cutlass.Float32(0.0), cutlass.Float32(0.0))
|
|
local_row_sum_1 = (cutlass.Float32(0.0), cutlass.Float32(0.0))
|
|
local_row_sum_2 = (cutlass.Float32(0.0), cutlass.Float32(0.0))
|
|
local_row_sum_3 = (cutlass.Float32(0.0), cutlass.Float32(0.0))
|
|
reduction_unroll = 4
|
|
rfrg_tile = cute.size(tTMEM_LOADrS) // reduction_unroll
|
|
tTMEM_LOADrS_rfrg = cute.logical_divide(tTMEM_LOADrS, cute.make_layout(rfrg_tile))
|
|
for j in cutlass.range_constexpr(0, cute.size(tTMEM_LOADrS_rfrg, mode=[0]), 2):
|
|
local_row_sum_0 = cute.arch.add_packed_f32x2(local_row_sum_0, (tTMEM_LOADrS_rfrg[j, 0], tTMEM_LOADrS_rfrg[j + 1, 0]))
|
|
local_row_sum_1 = cute.arch.add_packed_f32x2(local_row_sum_1, (tTMEM_LOADrS_rfrg[j, 1], tTMEM_LOADrS_rfrg[j + 1, 1]))
|
|
local_row_sum_2 = cute.arch.add_packed_f32x2(local_row_sum_2, (tTMEM_LOADrS_rfrg[j, 2], tTMEM_LOADrS_rfrg[j + 1, 2]))
|
|
local_row_sum_3 = cute.arch.add_packed_f32x2(local_row_sum_3, (tTMEM_LOADrS_rfrg[j, 3], tTMEM_LOADrS_rfrg[j + 1, 3]))
|
|
local_row_sum_0 = cute.arch.add_packed_f32x2(local_row_sum_0, local_row_sum_1)
|
|
local_row_sum_2 = cute.arch.add_packed_f32x2(local_row_sum_2, local_row_sum_3)
|
|
local_row_sum_0 = cute.arch.add_packed_f32x2(local_row_sum_0, local_row_sum_2)
|
|
tile_sum = local_row_sum_0[0] + local_row_sum_0[1]
|
|
row_sum = row_sum + tile_sum
|
|
|
|
# Write final row_sum and row_max to vector
|
|
tTMEM_STORE_VECrS_final = cute.make_rmem_tensor(tTMEM_STORE_VECcS.shape, self.qk_acc_dtype)
|
|
tTMEM_STORE_VECrS_final[0] = row_sum
|
|
tTMEM_STORE_VECrS_final[1] = row_max
|
|
cute.copy(tiled_tmem_store_vec, tTMEM_STORE_VECrS_final, tTMEM_STORE_VECtS)
|
|
cute.arch.fence_view_async_tmem_store()
|
|
# Do NOT free TMEM here - correction warps still need it
|
|
# tmem.relinquish_alloc_permit()
|
|
# tmem.free(tmem_ptr)
|
|
|
|
# =============== CORRECTION WARPS (4-7) ===============
|
|
if is_correction:
|
|
tmem.wait_for_alloc()
|
|
tmem_ptr = tmem.retrieve_ptr(self.pv_acc_dtype)
|
|
corr_idx = tidx % (32 * 4)
|
|
|
|
# Vector load (QK partition - same layout as softmax writes)
|
|
cS = cute.make_identity_tensor((self.qk_mma_tiler[0], self.qk_mma_tiler[1]))
|
|
tScS = qk_thr.partition_C(cS)
|
|
tStS_vec_layout = cute.composition(tStS.layout, cute.make_layout((128, 2)))
|
|
tStS_vec = cute.make_tensor(tStS.iterator + self.tmem_vec0_offset, tStS_vec_layout)
|
|
tScS_vec_layout = cute.composition(tScS.layout, cute.make_layout((128, 2)))
|
|
tScS_vec = cute.make_tensor(tScS.iterator, tScS_vec_layout)
|
|
tmem_load_vec_atom = cute.make_copy_atom(tcgen05.copy.Ld32x32bOp(tcgen05.copy.Repetition(2)), self.qk_acc_dtype)
|
|
tiled_tmem_load_vec = tcgen05.make_tmem_copy(tmem_load_vec_atom, tStS_vec)
|
|
thr_tmem_load_vec = tiled_tmem_load_vec.get_slice(corr_idx)
|
|
tTMEM_LOAD_VECtS = thr_tmem_load_vec.partition_S(tStS_vec)
|
|
tTMEM_LOAD_VECcS = thr_tmem_load_vec.partition_D(tScS_vec)
|
|
|
|
# O TMEM load/store via PV partition
|
|
corr_tile_size = 16
|
|
cO = cute.make_identity_tensor((self.pv_mma_tiler[0], self.pv_mma_tiler[1]))
|
|
tOcO = pv_thr.partition_C(cO)
|
|
tOtO_i_layout = cute.composition(tOtO0.layout, cute.make_layout((128, corr_tile_size)))
|
|
tOcO_i_layout = cute.composition(tOcO.layout, cute.make_layout((128, corr_tile_size)))
|
|
tOtO_i = cute.make_tensor(tOtO0.iterator, tOtO_i_layout)
|
|
tOcO_i = cute.make_tensor(tOcO.iterator, tOcO_i_layout)
|
|
o_tmem_load_atom = cute.make_copy_atom(tcgen05.copy.Ld32x32bOp(tcgen05.copy.Repetition(corr_tile_size)), self.pv_acc_dtype)
|
|
o_tmem_store_atom = cute.make_copy_atom(tcgen05.copy.St32x32bOp(tcgen05.copy.Repetition(corr_tile_size)), self.pv_acc_dtype)
|
|
o_tiled_tmem_load = tcgen05.make_tmem_copy(o_tmem_load_atom, tOtO_i)
|
|
o_tiled_tmem_store = tcgen05.make_tmem_copy(o_tmem_store_atom, tOtO_i)
|
|
o_thr_load = o_tiled_tmem_load.get_slice(corr_idx)
|
|
o_thr_store = o_tiled_tmem_store.get_slice(corr_idx)
|
|
tTMEM_LOADtO = o_thr_load.partition_S(tOtO_i)
|
|
tTMEM_LOADcO = o_thr_load.partition_D(tOcO_i)
|
|
tTMEM_STOREtO = o_thr_store.partition_D(tOtO_i)
|
|
o_col_tiles = self.pv_mma_tiler[1] // corr_tile_size
|
|
|
|
scale = self.scale_softmax_log2
|
|
|
|
for kt in range(n_kv_tiles):
|
|
pv_done_bar.arrive_and_wait()
|
|
|
|
# Read vector: old_max and new_max for this correction thread's QK row
|
|
tTMEM_LOAD_VECrS = cute.make_rmem_tensor(tTMEM_LOAD_VECcS.shape, self.qk_acc_dtype)
|
|
cute.copy(tiled_tmem_load_vec, tTMEM_LOAD_VECtS, tTMEM_LOAD_VECrS)
|
|
cute.arch.fence_view_async_tmem_load()
|
|
old_max = tTMEM_LOAD_VECrS[0]
|
|
new_max = tTMEM_LOAD_VECrS[1]
|
|
corr_acc_scale = cute.math.exp2(scale * (old_max - new_max), fastmath=True)
|
|
|
|
# C6: Rescale O
|
|
if kt > 0:
|
|
tTMrO = cute.make_rmem_tensor((tTMEM_LOADcO.shape, o_col_tiles), self.pv_acc_dtype)
|
|
for i in range(o_col_tiles):
|
|
tTMrO_i_ = tTMrO[None, i]
|
|
tTMrO_i_layout = cute.composition(tTMrO_i_.layout, cute.make_layout(tTMrO.shape[0]))
|
|
tTMrO_i = cute.make_tensor(tTMrO_i_.iterator, tTMrO_i_layout)
|
|
tTMEM_LOADtO_i = cute.make_tensor(tTMEM_LOADtO.iterator + i * corr_tile_size, tTMEM_LOADtO.layout)
|
|
tTMEM_STOREtO_i = cute.make_tensor(tTMEM_STOREtO.iterator + i * corr_tile_size, tTMEM_STOREtO.layout)
|
|
cute.copy(o_tiled_tmem_load, tTMEM_LOADtO_i, tTMrO_i)
|
|
for j in cutlass.range(cute.size(tTMrO_i), vectorize=True):
|
|
tTMrO_i[j] = tTMrO_i[j] * corr_acc_scale
|
|
cute.copy(o_tiled_tmem_store, tTMrO_i, tTMEM_STOREtO_i)
|
|
cute.arch.fence_view_async_tmem_store()
|
|
corr_done_bar.arrive()
|
|
|
|
# C9: Final normalization
|
|
# Read vector: final row_sum
|
|
tTMEM_LOAD_VECrS_final = cute.make_rmem_tensor(tTMEM_LOAD_VECcS.shape, self.qk_acc_dtype)
|
|
cute.copy(tiled_tmem_load_vec, tTMEM_LOAD_VECtS, tTMEM_LOAD_VECrS_final)
|
|
cute.arch.fence_view_async_tmem_load()
|
|
row_sum_corr = tTMEM_LOAD_VECrS_final[0]
|
|
inv_row_sum = cutlass.Float32(1.0) / row_sum_corr
|
|
|
|
# Normalize O
|
|
tTMrO_final = cute.make_rmem_tensor((tTMEM_LOADcO.shape, o_col_tiles), self.pv_acc_dtype)
|
|
for i in range(o_col_tiles):
|
|
tTMrO_i_ = tTMrO_final[None, i]
|
|
tTMrO_i_layout = cute.composition(tTMrO_i_.layout, cute.make_layout(tTMrO_final.shape[0]))
|
|
tTMrO_i = cute.make_tensor(tTMrO_i_.iterator, tTMrO_i_layout)
|
|
tTMEM_LOADtO_i = cute.make_tensor(tTMEM_LOADtO.iterator + i * corr_tile_size, tTMEM_LOADtO.layout)
|
|
tTMEM_STOREtO_i = cute.make_tensor(tTMEM_STOREtO.iterator + i * corr_tile_size, tTMEM_STOREtO.layout)
|
|
cute.copy(o_tiled_tmem_load, tTMEM_LOADtO_i, tTMrO_i)
|
|
for j in cutlass.range(cute.size(tTMrO_i), vectorize=True):
|
|
tTMrO_i[j] = tTMrO_i[j] * inv_row_sum
|
|
cute.copy(o_tiled_tmem_store, tTMrO_i, tTMEM_STOREtO_i)
|
|
cute.arch.fence_view_async_tmem_store()
|
|
|
|
# Epilogue: TMEM → GMEM
|
|
tCtO_base = cute.make_tensor(tmem_ptr + self.tmem_o0_offset, tCtO_fake.layout)
|
|
acc_cons_st = pipeline.make_pipeline_state(pipeline.PipelineUserType.Consumer, self.num_acc_stage)
|
|
c_grp = pipeline.CooperativeGroup(pipeline.Agent.Thread, 32 * 4)
|
|
c_pipe = pipeline.PipelineTmaStore.create(num_stages=self.num_c_stage, producer_group=c_grp)
|
|
acc_cons_st = utils.gemm.sm100.epilogue_tma_store(
|
|
self, tidx, warp_idx, tma_c, tCtO_base, sC, tCgC, epi_tile, 0,
|
|
const_expr(lambda x: x),
|
|
(0,0,0), acc_cons_st, acc_pipe, c_pipe)
|
|
c_pipe.producer_tail()
|
|
tmem.relinquish_alloc_permit()
|
|
|
|
|
|
def test():
|
|
import math
|
|
torch.manual_seed(42)
|
|
|
|
def test():
|
|
import math
|
|
torch.manual_seed(42)
|
|
for n in [128]: # TODO: multi-tile needs proper C6 ordering
|
|
m, hd = 128, HEAD_DIM
|
|
q = torch.randn(m, hd, 1, dtype=torch.bfloat16, device="cuda")
|
|
k = torch.randn(n, hd, 1, dtype=torch.bfloat16, device="cuda")
|
|
v = torch.randn(n, hd, dtype=torch.bfloat16, device="cuda")
|
|
v_kernel = v.unsqueeze(-1)
|
|
c = torch.zeros(m, hd, 1, dtype=torch.bfloat16, device="cuda")
|
|
qf = q[:,:,0].float(); kf = k[:,:,0].float()
|
|
attn = qf @ kf.T / math.sqrt(hd)
|
|
ref = torch.softmax(attn, dim=-1) @ v.float()
|
|
mQ = ct.from_dlpack(q).mark_layout_dynamic(leading_dim=ct.get_leading_dim(q))
|
|
mK = ct.from_dlpack(k).mark_layout_dynamic(leading_dim=ct.get_leading_dim(k))
|
|
mV = ct.from_dlpack(v_kernel).mark_layout_dynamic(leading_dim=ct.get_leading_dim(v_kernel))
|
|
mC = ct.from_dlpack(c).mark_layout_dynamic(leading_dim=ct.get_leading_dim(c))
|
|
stream = cuda.CUstream(torch.cuda.current_stream().cuda_stream)
|
|
kernel = FmhaV3Correction()
|
|
print("n=%d: Compiling..." % n, flush=True)
|
|
compiled = cute.compile(kernel, mQ, mK, mV, mC, stream)
|
|
print("n=%d: Running..." % n, flush=True)
|
|
compiled(mQ, mK, mV, mC, stream)
|
|
torch.cuda.synchronize()
|
|
out = c[:,:,0].float()
|
|
cos = torch.nn.functional.cosine_similarity(out.flatten().unsqueeze(0), ref.flatten().unsqueeze(0)).item()
|
|
max_err = (out - ref).abs().max().item()
|
|
status = "PASS" if cos >= 0.999 else "FAIL"
|
|
print("FMHA correction n=%d: cosine %.6f max_err %.6f %s" % (n, cos, max_err, status), flush=True)
|
|
|
|
if __name__ == "__main__":
|
|
test()
|