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[None][perf] Enable tiled FP8 context FMHA for head_dim 256 on SM120 #19825

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[None][perf] Enable tiled FP8 context FMHA for head_dim 256 on SM120 #19825

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4 changes: 3 additions & 1 deletion cpp/kernels/fmha_v2/setup.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# SPDX-FileCopyrightText: Copyright (c) 2020-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-FileCopyrightText: Copyright (c) 2020-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
Expand Down Expand Up @@ -5610,6 +5610,8 @@ def enumerate_qmma_flash_kernels(specs,
((192, 128), (64, 64), 1),
((576, 512), (64, 64), 1),
]
if sm == 120:
params_q_kv_step.append((256, (64, 128), 1))
input_layouts = [
InputLayout.PACKED_QKV, InputLayout.CONTIGUOUS_Q_KV,
InputLayout.Q_PAGED_KV, InputLayout.SEPARATE_Q_K_V
Expand Down
4 changes: 2 additions & 2 deletions cpp/tensorrt_llm/kernels/contextFusedMultiHeadAttention/fmhaRunner.cpp
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2020-2025, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2020-2026, NVIDIA CORPORATION. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
Expand Down Expand Up @@ -405,7 +405,7 @@ void FusedMHARunnerV2::setupLaunchParams(MHARunnerParams runnerParams)
mLaunchParams.kernel_s = 0;
mLaunchParams.force_unroll = true;
// enable tiled kernels on Ampere/Ada
if ((isSm89 || isSm120f) && mFixedParams.dataType == DATA_TYPE_E4M3)
if (isSm89 && mFixedParams.dataType == DATA_TYPE_E4M3)
{
// so far Ada QMMA only supports non-tiled kernels.
mLaunchParams.granular_tiling = false;
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