introducing ck_tile! (#1216)

* enable gfx940

* switch between intrinsic mfma routines on mi100/200 and mi300

* fix mfma_int8 on MI300

* disable 2 int8 examples on MI300

* Update cmake-ck-dev.sh

* restore gitignore file

* modify Jenkinsfile to the internal repo

* Bump rocm-docs-core from 0.24.0 to 0.29.0 in /docs/sphinx

Bumps [rocm-docs-core](https://github.com/RadeonOpenCompute/rocm-docs-core) from 0.24.0 to 0.29.0.
- [Release notes](https://github.com/RadeonOpenCompute/rocm-docs-core/releases)
- [Changelog](https://github.com/RadeonOpenCompute/rocm-docs-core/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/RadeonOpenCompute/rocm-docs-core/compare/v0.24.0...v0.29.0

)

---
updated-dependencies:
- dependency-name: rocm-docs-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...
Signed-off-by: dependabot[bot] <support@github.com>

* initial enablement of gfx950

* fix clang format

* disable examples 31 and 41 int8 on gfx950

* add code

* fix build wip

* fix xx

* now can build

* naming

* minor fix

* wip fix

* fix macro for exp2; fix warpgemm a/b in transposedC

* unify as tuple_array

* Update the required Python version to 3.9

* Update executable name in test scripts

* re-structure tuple/array to avoid spill

* Merge function templates

* Fix format

* Add constraint to array<> ctor

* Re-use function

* Some minor changes

* remove wrong code in store_raw()

* fix compile issue in transpose

* Rename enum
Rename 'cood_transform_enum' to 'coord_transform_enum'

* let more integral_constant->constant, and formating

* make sure thread_buffer can be tuple/array

* temp fix buffer_store spill

* not using custom data type by default, now we can have ISA-level same code as opt_padding

* fix compile error, fp8 not ready now

* fix fp8 duplicated move/shift/and/or problem

* Default use CK_TILE_FLOAT_TO_FP8_STOCHASTIC rounding mode

* fix scratch in fp8 kernel

* update some readme

* fix merge from upstream

* sync with upstream

* sync upstream again

* sync 22

* remove unused

* fix clang-format

* update README of ck_tile example

* fix several issue

* let python version to be 3.8 as minimal

* remove ck_tile example from default cmake target like all/install/check

* remove mistake

* 1).support receipe in generate.py 2).use simplified mask type 3).change left/right to pass into karg

* fix some bug in group-mode masking and codegen. update README

* F8 quantization for FMHA forward (#1224)

* Add SAccElementFunction, PComputeElementFunction, OAccElementFunction in pipeline

* Add element function to fmha api

* Adjust P elementwise function

* Fix bug of elementwise op, our elementwise op is not inout

* Add some elementwise op, prepare to quantization

* Let generate.py can generate different elementwise function

* To prevent compiler issue, remove the elementwise function we have not used.

* Remove f8 pipeline, we should share the same pipeline even in f8

* Remove remove_cvref_t

* Avoid warning

* Fix wrong fp8 QK/KV block gemm setting

* Check fp8 rounding error in check_err()

* Set fp8 rounding error for check_err()

* Use CK_TILE_FLOAT_TO_FP8_STANDARD as default fp8 rounding mode

* 1. codgen the f8 api and kernel
2. f8 host code

* prevent warning in filter mode

* Remove not-in-use elementwise function kargs

* Remove more not-in-use elementwise function kargs

* Small refinements in C++ source files

* Use conditional_t<> to simplify code

* Support heterogeneous argument for binary function types

* Re-use already-existing scales<> functor template

* Fix wrong value produced by saturating

* Generalize the composes<> template

* Unify saturates<> implementation

* Fix type errors in composes<>

* Extend less_equal<>

* Reuse the existing template less_equal<> in check_err()

* Add equal<float> & equal<double>

* Rename check_err() parameter

* Rename check_err() parameter

* Add FIXME comment for adding new macro in future

* Remove unnecessary cast to void

* Eliminate duplicated code

* Avoid dividing api pool into more than 2 groups

* Use more clear variable names

* Use affirmative condition in if stmt

* Remove blank lines

* Donot perfect forwarding in composes<>

* To fix compile error, revert generate.py back to 4439cc107dd90302d68a6494bdd33113318709f8

* Fix bug of p element function

* Add compute element op to host softmax

* Remove element function in api interface

* Extract user parameter

* Rename pscale and oscale variable

* rename f8 to fp8

* rename more f8 to fp8

* Add pipeline::operator() without element_functor

* 1. Remove deprecated pipeline enum
2. Refine host code parameter

* Use quantization range as input

* 1. Rename max_dtype to dtype_max.
2. Rename scale to scale_s
3.Add init description

* Refine description

* prevent early return

* unify _squant kernel name in cpp, update README

* Adjust the default range.

* Refine error message and bias range

* Add fp8 benchmark and smoke test

* fix fp8 swizzle_factor=4 case

---------
Co-authored-by: Po Yen Chen <PoYen.Chen@amd.com>
Co-authored-by: carlushuang <carlus.huang@amd.com>

---------
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: illsilin <Illia.Silin@amd.com>
Co-authored-by: Illia Silin <98187287+illsilin@users.noreply.github.com>
Co-authored-by: Jing Zhang <jizha@amd.com>
Co-authored-by: zjing14 <zhangjing14@gmail.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Po-Yen, Chen <PoYen.Chen@amd.com>
Co-authored-by: rocking <ChunYu.Lai@amd.com>

include/ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qr_ks_vs.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qr_ks_vs_default_policy.hpp"
+#include "ck_tile/ops/reduce/block/block_reduce.hpp"
+
+namespace ck_tile {
+
+// This pipeline is qkv all located in LDS
+template <typename Problem_, typename Policy_ = BlockFmhaPipelineQRKSVSDefaultPolicy>
+struct BlockFmhaPipelineQRKSVS
+{
+    using Problem             = remove_cvref_t<Problem_>;
+    using Policy              = remove_cvref_t<Policy_>;
+    using QDataType           = remove_cvref_t<typename Problem::QDataType>;
+    using KDataType           = remove_cvref_t<typename Problem::KDataType>;
+    using VDataType           = remove_cvref_t<typename Problem::VDataType>;
+    using SaccDataType        = remove_cvref_t<typename Problem::SaccDataType>;
+    using SMPLComputeDataType = remove_cvref_t<typename Problem::SMPLComputeDataType>;
+    using BiasDataType        = remove_cvref_t<typename Problem::BiasDataType>;
+    using LSEDataType         = remove_cvref_t<typename Problem::LSEDataType>;
+    using PDataType           = remove_cvref_t<typename Problem::PDataType>;
+    using OaccDataType        = remove_cvref_t<typename Problem::OaccDataType>;
+    using ODataType           = remove_cvref_t<typename Problem::ODataType>;
+    using FmhaMask            = remove_cvref_t<typename Problem::FmhaMask>;
+
+    using BlockFmhaShape             = remove_cvref_t<typename Problem::BlockFmhaShape>;
+    using VLayout                    = remove_cvref_t<typename BlockFmhaShape::VLayout>;
+    static constexpr bool kQLoadOnce = true; // if q_tile load whole block length (hdim) at once
+    static_assert(kQLoadOnce == Policy::QLoadOnce);
+    static constexpr bool kIsFp8 = Problem::kIsFp8;
+
+    static constexpr index_t kBlockSize = Problem::kBlockSize;
+
+    static constexpr index_t kM0            = BlockFmhaShape::kM0;
+    static constexpr index_t kN0            = BlockFmhaShape::kN0;
+    static constexpr index_t kK0            = BlockFmhaShape::kK0;
+    static constexpr index_t kN1            = BlockFmhaShape::kN1;
+    static constexpr index_t kK1            = BlockFmhaShape::kK1;
+    static constexpr index_t kK0BlockLength = BlockFmhaShape::kK0BlockLength;
+
+    static constexpr bool kIsGroupMode = Problem::kIsGroupMode;
+    static constexpr bool kPadSeqLenQ  = Problem::kPadSeqLenQ;
+    static constexpr bool kPadSeqLenK  = Problem::kPadSeqLenK;
+    static constexpr bool kPadHeadDimQ = Problem::kPadHeadDimQ;
+    static constexpr bool kPadHeadDimV = Problem::kPadHeadDimV;
+    static constexpr bool kHasBias     = Problem::kHasBias;
+    static constexpr bool kStoreLSE    = Problem::kStoreLSE;
+
+    // last dimension vector length used to create tensor view(and decide buffer_load vector length)
+    // ... together with tensor distribution. tensor dist should able to overwrite this
+    static constexpr index_t kAlignmentQ =
+        kPadHeadDimQ ? 1 : Policy::template GetAlignmentQ<Problem>();
+    static constexpr index_t kAlignmentK =
+        kPadHeadDimQ ? 1 : Policy::template GetAlignmentK<Problem>();
+    static constexpr index_t kAlignmentV = []() {
+        if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+            return kPadHeadDimV ? 1 : Policy::template GetAlignmentV<Problem>();
+        else
+            return kPadSeqLenK ? 1 : Policy::template GetAlignmentV<Problem>();
+    }();
+
+    static constexpr index_t kAlignmentO =
+        kPadHeadDimV ? 1 : Policy::template GetAlignmentO<Problem>();
+    static constexpr index_t kAlignmentBias =
+        kPadSeqLenK ? 1 : Policy::template GetAlignmentBias<Problem>();
+
+    static constexpr index_t kBlockPerCu = []() {
+        if constexpr(Problem::kBlockPerCu != -1)
+            return Problem::kBlockPerCu;
+        else
+        {
+            if constexpr(kK0BlockLength <= 32)
+            {
+                return 2;
+            }
+            else if constexpr(kK0BlockLength <= 64)
+            {
+                return 3;
+            }
+            else if constexpr(kK0BlockLength <= 128)
+            {
+                if constexpr(kHasBias)
+                    return 1;
+                else
+                    return 2;
+            }
+            else if constexpr(kK0BlockLength <= 256)
+            {
+                return 1;
+            }
+        }
+    }();
+
+    static constexpr const char* name = "qr";
+
+    CK_TILE_HOST_DEVICE static constexpr ck_tile::index_t GetSmemSize()
+    {
+        return Policy::template GetSmemSize<Problem>();
+    }
+
+    template <typename QDramBlockWindowTmp,
+              typename KDramBlockWindowTmp,
+              typename VDramBlockWindowTmp,
+              typename BiasDramBlockWindowTmp,
+              typename LSEDramBlockWindowTmp,
+              typename QElementFunction,
+              typename KElementFunction,
+              typename VElementFunction,
+              typename BiasElementFunction,
+              typename LSEElementFunction,
+              typename SAccElementFunction,
+              typename PComputeElementFunction,
+              typename OAccElementFunction>
+    CK_TILE_HOST_DEVICE auto
+    operator()(const QDramBlockWindowTmp& q_dram_block_window_tmp, // M0*K0 tile
+               const QElementFunction& q_element_func,
+               const KDramBlockWindowTmp& k_dram_block_window_tmp, // N0*K0 tile
+               const KElementFunction& k_element_func,
+               const VDramBlockWindowTmp& v_dram_block_window_tmp, // N1*K1 tile
+               const VElementFunction& v_element_func,
+               const BiasDramBlockWindowTmp& bias_dram_block_window_tmp, // M0*N0 tile
+               const BiasElementFunction& bias_element_func,
+               LSEDramBlockWindowTmp& lse_dram_window_tmp, // M0*1 tile
+               const LSEElementFunction& lse_element_func,
+               const SAccElementFunction& s_acc_element_func,
+               const PComputeElementFunction& p_compute_element_func,
+               const OAccElementFunction& o_acc_element_func,
+               FmhaMask mask,
+               float scale_s,
+               void* smem_ptr) const
+    {
+        static_assert(
+            std::is_same_v<QDataType, remove_cvref_t<typename QDramBlockWindowTmp::DataType>> &&
+                std::is_same_v<KDataType, remove_cvref_t<typename KDramBlockWindowTmp::DataType>> &&
+                std::is_same_v<VDataType, remove_cvref_t<typename VDramBlockWindowTmp::DataType>>,
+            "wrong!");
+
+        static_assert(kM0 == QDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kN0 == KDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kK0 == KDramBlockWindowTmp{}.get_window_lengths()[number<1>{}] &&
+                          kN1 == VDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kK1 == VDramBlockWindowTmp{}.get_window_lengths()[number<1>{}] &&
+                          kM0 == BiasDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kN0 == BiasDramBlockWindowTmp{}.get_window_lengths()[number<1>{}],
+                      "wrong!");
+
+        // K tile in LDS
+        KDataType* k_lds_ptr = static_cast<KDataType*>(static_cast<void*>(
+            static_cast<char*>(smem_ptr) + Policy::template GetSmemSizeQ<Problem>()));
+        auto k_lds           = make_tensor_view<address_space_enum::lds>(
+            k_lds_ptr, Policy::template MakeKLdsBlockDescriptor<Problem>());
+        auto k_lds_window =
+            make_tile_window(k_lds, make_tuple(number<kN0>{}, number<kK0>{}), {0, 0});
+
+        // V tile in LDS
+        auto v_lds = make_tensor_view<address_space_enum::lds>(
+            reinterpret_cast<VDataType*>(smem_ptr),
+            Policy::template MakeVLdsBlockDescriptor<Problem>());
+        auto v_lds_window = make_tile_window(
+            v_lds, Policy::template MakeVLdsBlockDescriptor<Problem>().get_lengths(), {0, 0});
+
+        // Block GEMM
+        constexpr auto gemm_0 = Policy::template GetQKBlockGemm<Problem>();
+        constexpr auto gemm_1 = Policy::template GetKVBlockGemm<Problem>();
+
+        auto q_dram_window = make_tile_window(
+            q_dram_block_window_tmp.get_bottom_tensor_view(),
+            q_dram_block_window_tmp.get_window_lengths(),
+            q_dram_block_window_tmp.get_window_origin(),
+            Policy::template MakeQDramTileDistribution<Problem, decltype(gemm_0)>());
+
+        auto q = load_tile(q_dram_window);
+
+        using SaccBlockTileType = decltype(gemm_0.MakeCBlockTile());
+        auto s_acc              = SaccBlockTileType{};
+
+        // reduction function for softmax
+        const auto f_max = [](auto e0, auto e1) { return max(e0, e1); };
+        const auto f_sum = [](auto e0, auto e1) { return e0 + e1; };
+
+        // infer Sacc, S, P, M, L, Oacc type
+        using SBlockTileType = decltype(cast_tile<SMPLComputeDataType>(s_acc));
+
+        using MLBlockTileType = decltype(block_tile_reduce<SMPLComputeDataType>(
+            SBlockTileType{}, sequence<1>{}, f_max, SMPLComputeDataType{0}));
+
+        using OaccBlockTileType = decltype(gemm_1.MakeCBlockTile());
+
+        // init Oacc, M, L
+        auto o_acc = OaccBlockTileType{};
+        auto m     = MLBlockTileType{};
+        auto l     = MLBlockTileType{};
+
+        clear_tile(o_acc);
+        set_tile(m, -numeric<SMPLComputeDataType>::infinity());
+        clear_tile(l);
+
+        const auto q_origin = q_dram_window.get_window_origin();
+        const auto [seqlen_k_start, seqlen_k_end] =
+            mask.GetTileRangeAlongX(q_origin.at(number<0>{}), number<kM0>{}, number<kN0>{});
+
+        const auto num_total_loop = integer_divide_ceil(seqlen_k_end - seqlen_k_start, kN0);
+
+        // check early exit if masked and no work to do.
+        if constexpr(FmhaMask::IsMasking)
+        {
+            if(num_total_loop <= 0)
+            {
+                if constexpr(kStoreLSE)
+                {
+                    auto lse =
+                        make_static_distributed_tensor<LSEDataType>(m.get_tile_distribution());
+
+                    set_tile(lse, -numeric<SMPLComputeDataType>::infinity());
+
+                    store_tile(lse_dram_window_tmp, tile_elementwise_in(lse_element_func, lse));
+                }
+
+                // Note: here occ are all cleard, return it
+                // Note: q loaded but no fence, ignore it.
+                return o_acc;
+            }
+        }
+
+        auto k_dram_block_window =
+            make_tile_window(k_dram_block_window_tmp.get_bottom_tensor_view(),
+                             k_dram_block_window_tmp.get_window_lengths(),
+                             {seqlen_k_start, 0});
+
+        const auto bias_origin = bias_dram_block_window_tmp.get_window_origin();
+        auto bias_dram_window  = make_tile_window(
+            bias_dram_block_window_tmp.get_bottom_tensor_view(),
+            bias_dram_block_window_tmp.get_window_lengths(),
+            {bias_origin.at(number<0>{}), seqlen_k_start}, // M/N
+            Policy::template MakeBiasDramTileDistribution<Problem, decltype(gemm_0)>());
+
+        auto v_dram_window =
+            make_tile_window(v_dram_block_window_tmp.get_bottom_tensor_view(),
+                             v_dram_block_window_tmp.get_window_lengths(),
+                             {0, seqlen_k_start}, // TODO: hdim split?
+                             Policy::template MakeVDramTileDistribution<Problem>());
+
+        auto q_tile = tile_elementwise_in(q_element_func, q);
+
+        // prefetch K tile
+        index_t i_total_loops      = 0;
+        constexpr index_t k0_loops = kK0BlockLength / kK0;
+        constexpr index_t k1_loops = kN0 / kK1;
+
+        static_assert(2 <= k0_loops);
+        static_assert(1 <= k1_loops);
+        do
+        {
+            // STAGE 1, QK gemm
+            auto k_dram_window = make_tile_window(
+                k_dram_block_window.get_bottom_tensor_view(),
+                k_dram_block_window.get_window_lengths(),
+                k_dram_block_window.get_window_origin(),
+                Policy::template MakeKDramTileDistribution<Problem>()); // K DRAM tile window for
+                                                                        // load
+
+            auto k_block_tile = load_tile(k_dram_window);
+            {
+                move_tile_window(k_dram_window, {0, kK0});
+                clear_tile(s_acc); // initialize C
+                store_tile(k_lds_window, tile_elementwise_in(k_element_func, k_block_tile));
+                k_block_tile = load_tile(k_dram_window);
+            }
+
+            if constexpr(kHasBias)
+            {
+                __builtin_amdgcn_sched_barrier(
+                    0); // prevent from messing up the order of global loads
+            }
+            const auto bias_tile = load_tile(bias_dram_window); // load bias tile
+            if constexpr(kHasBias)
+            {
+                __builtin_amdgcn_sched_barrier(
+                    0); // prevent from messing up the order of global loads
+            }
+
+            if constexpr(k0_loops > 2)
+            {
+                static_for<0, k0_loops - 2, 1>{}([&](auto i_k0) {
+                    block_sync_lds();
+                    gemm_0(s_acc,
+                           get_slice_tile(q_tile,
+                                          sequence<0, i_k0 * kK0>{},
+                                          sequence<kM0, (i_k0 + 1) * kK0>{}),
+                           k_lds_window);
+                    block_sync_lds();
+                    move_tile_window(k_dram_window, {0, kK0});
+
+                    store_tile(
+                        k_lds_window,
+                        tile_elementwise_in(k_element_func, k_block_tile)); // LDS write i + 1
+                    k_block_tile = load_tile(k_dram_window);                // global read i + 2
+                });
+            }
+
+            const auto v_prefetch = load_tile(v_dram_window); // prefetch load v tile
+            {                                                 // tail
+                block_sync_lds();
+                gemm_0(s_acc,
+                       get_slice_tile(q_tile,
+                                      sequence<0, (k0_loops - 2) * kK0>{},
+                                      sequence<kM0, (k0_loops - 1) * kK0>{}),
+                       k_lds_window);
+                block_sync_lds();
+
+                store_tile(k_lds_window, tile_elementwise_in(k_element_func, k_block_tile));
+                block_sync_lds();
+
+                gemm_0(s_acc,
+                       get_slice_tile(q_tile,
+                                      sequence<0, (k0_loops - 1) * kK0>{},
+                                      sequence<kM0, k0_loops * kK0>{}),
+                       k_lds_window);
+            }
+
+            // STAGE 2, scale_s, add bias, mask, softmax
+            if constexpr(kHasBias)
+            {
+                s_acc = tile_elementwise_in(s_acc_element_func, s_acc);
+                tile_elementwise_inout([&scale_s](auto& x) { x = x * scale_s; }, s_acc);
+                tile_elementwise_inout(
+                    [&](auto& x, const auto& y) {
+#if !CK_TILE_FMHA_FWD_FAST_EXP2
+                        x += type_convert<SaccDataType>(bias_element_func(y));
+#else
+                        x += log2e_v<SaccDataType> *
+                             type_convert<SaccDataType>(bias_element_func(y));
+#endif
+                    },
+                    s_acc,
+                    bias_tile);
+            }
+            else
+            {
+                s_acc = tile_elementwise_in(s_acc_element_func, s_acc);
+#if !CK_TILE_FMHA_FWD_FAST_EXP2
+                tile_elementwise_inout([&scale_s](auto& x) { x = x * scale_s; }, s_acc);
+#endif
+            }
+            move_tile_window(bias_dram_window, {0, kN0});
+            if constexpr(kPadSeqLenK || FmhaMask::IsMasking)
+            {
+                const auto k_origin      = k_dram_block_window.get_window_origin();
+                bool need_perpixel_check = mask.IsEdgeTile(q_origin.at(number<0>{}),
+                                                           k_origin.at(number<0>{}),
+                                                           number<kM0>{},
+                                                           number<kN0>{});
+                if(need_perpixel_check)
+                {
+                    set_tile_if(
+                        s_acc, -numeric<SMPLComputeDataType>::infinity(), [&](auto tile_idx) {
+                            const auto row = q_origin.at(number<0>{}) + tile_idx.at(number<0>{});
+                            const auto col = k_origin.at(number<0>{}) + tile_idx.at(number<1>{});
+                            return mask.IsOutOfBound(row, col);
+                        });
+                }
+            }
+
+            const auto s = cast_tile<SMPLComputeDataType>(s_acc); // S{j}
+            auto m_local = block_tile_reduce<SMPLComputeDataType>(
+                s,
+                sequence<1>{},
+                f_max,
+                -numeric<SMPLComputeDataType>::infinity()); // m_local = rowmax(S{j})
+            block_tile_reduce_sync(m_local, f_max, bool_constant<false>{});
+
+            const auto m_old = m; // m{j-1}
+            tile_elementwise_inout(
+                [](auto& e0, auto e1, auto e2) { e0 = max(e1, e2); }, m, m_old, m_local); // m{j}
+
+            auto p_compute = make_static_distributed_tensor<SMPLComputeDataType>(
+                s.get_tile_distribution()); // Pcompute{j}
+
+            static const auto get_validated_m = [](SMPLComputeDataType raw_m) {
+                /// NOTICE: bias might be materialized mask including -inf values, need
+                /// consideration
+                if constexpr(kHasBias || FmhaMask::IsMasking)
+                {
+                    return raw_m == -numeric<SMPLComputeDataType>::infinity()
+                               ? type_convert<SMPLComputeDataType>(0.f)
+                               : raw_m;
+                }
+                else
+                {
+                    return raw_m;
+                }
+            };
+
+            constexpr auto p_spans = decltype(p_compute)::get_distributed_spans();
+            sweep_tile_span(p_spans[number<0>{}], [&](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                auto row_max = scale_s * get_validated_m(m[i_idx]);
+#endif
+                sweep_tile_span(p_spans[number<1>{}], [&](auto idx1) {
+                    constexpr auto i_j_idx = make_tuple(idx0, idx1);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                    if constexpr(kHasBias)
+                    {
+                        p_compute(i_j_idx) = exp2(s[i_j_idx] - get_validated_m(m[i_idx]));
+                    }
+                    else
+                    {
+                        p_compute(i_j_idx) = exp2(scale_s * s[i_j_idx] - row_max);
+                    }
+#else
+                    p_compute(i_j_idx)     = exp(s[i_j_idx] - get_validated_m(m[i_idx]));
+#endif
+                });
+            });
+
+            auto rowsum_p = block_tile_reduce<SMPLComputeDataType>(
+                p_compute, sequence<1>{}, f_sum, SMPLComputeDataType{0}); // rowsum(Pcompute{j})
+
+            block_tile_reduce_sync(rowsum_p, f_sum, bool_constant<false>{});
+            // l{j}, Oacc{j}
+            constexpr auto o_spans = decltype(o_acc)::get_distributed_spans();
+            sweep_tile_span(o_spans[number<0>{}], [&](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                const auto tmp = [&]() {
+                    if constexpr(kHasBias)
+                    {
+                        return exp2(m_old[i_idx] - get_validated_m(m[i_idx]));
+                    }
+                    else
+                    {
+                        auto row_max = scale_s * get_validated_m(m[i_idx]);
+                        return exp2(scale_s * m_old[i_idx] - row_max);
+                    }
+                }();
+#else
+                const auto tmp       = exp(m_old[i_idx] - get_validated_m(m[i_idx]));
+#endif
+                l(i_idx) = tmp * l[i_idx] + rowsum_p[i_idx];
+                sweep_tile_span(o_spans[number<1>{}], [&](auto idx1) {
+                    constexpr auto i_j_idx = make_tuple(idx0, idx1);
+                    // FIXME: this use different equation from FA v2 paper,
+                    // but produce correc result.
+                    // Is the equation wrong?
+                    o_acc(i_j_idx) *= tmp;
+                });
+            });
+
+            block_sync_lds();
+            if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+            {
+                auto v_shuffle_tmp = make_static_distributed_tensor<VDataType>(
+                    Policy::template MakeShuffledVRegBlockDescriptor<Problem>());
+                shuffle_tile(v_shuffle_tmp, v_prefetch);
+                store_tile(
+                    v_lds_window,
+                    tile_elementwise_in(v_element_func, v_shuffle_tmp)); // store the prefetch
+            }
+            else
+            {
+                store_tile(v_lds_window,
+                           tile_elementwise_in(v_element_func, v_prefetch)); // store the prefetch
+            }
+            move_tile_window(v_dram_window, {0, kK1});
+
+            const auto p =
+                cast_tile<PDataType>(tile_elementwise_in(p_compute_element_func, p_compute));
+
+            // STAGE 3, KV gemm
+            if constexpr(k1_loops > 1)
+            {
+                static_for<0, k1_loops - 1, 1>{}([&](auto i_k1) {
+                    const auto v = load_tile(v_dram_window); // load next v
+                    block_sync_lds();
+                    gemm_1(o_acc,
+                           get_slice_tile(
+                               p, sequence<0, i_k1 * kK1>{}, sequence<kM0, (i_k1 + 1) * kK1>{}),
+                           v_lds_window);
+                    block_sync_lds();
+                    if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+                    {
+                        auto v_shuffle_tmp = make_static_distributed_tensor<VDataType>(
+                            Policy::template MakeShuffledVRegBlockDescriptor<Problem>());
+                        shuffle_tile(v_shuffle_tmp, v);
+                        store_tile(v_lds_window,
+                                   tile_elementwise_in(v_element_func,
+                                                       v_shuffle_tmp)); // store the prefetch
+                    }
+                    else
+                    {
+                        store_tile(v_lds_window,
+                                   tile_elementwise_in(v_element_func, v)); // store next v
+                    }
+                    move_tile_window(v_dram_window, {0, kK1});
+                });
+            }
+            // move K tile windows
+            move_tile_window(k_dram_block_window, {kN0, 0});
+            // tail
+            {
+                block_sync_lds();
+                gemm_1(o_acc,
+                       get_slice_tile(p, sequence<0, (k1_loops - 1) * kK1>{}, sequence<kM0, kN0>{}),
+                       v_lds_window);
+                block_sync_lds();
+            }
+        } while(++i_total_loops < num_total_loop);
+
+        // store lse
+        if constexpr(kStoreLSE)
+        {
+            auto lse = make_static_distributed_tensor<LSEDataType>(m.get_tile_distribution());
+
+            constexpr auto lse_spans = decltype(lse)::get_distributed_spans();
+            sweep_tile_span(lse_spans[number<0>{}], [&, m_ = m, l_ = l](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                if constexpr(kHasBias)
+                {
+                    lse(i_idx) = m_[i_idx] / C_LOG2E + log(l_[i_idx]);
+                }
+                else
+                {
+                    lse(i_idx) = m_[i_idx] * scale_s / C_LOG2E + log(l_[i_idx]);
+                }
+#else
+                lse(i_idx) = m_[i_idx] + log(l_[i_idx]);
+#endif
+            });
+
+            store_tile(lse_dram_window_tmp, tile_elementwise_in(lse_element_func, lse));
+        }
+
+        // finally, O
+        constexpr auto o_spans = decltype(o_acc)::get_distributed_spans();
+
+        sweep_tile_span(o_spans[number<0>{}], [&](auto idx0) {
+            constexpr auto i_idx = make_tuple(idx0);
+            const auto tmp       = [&]() {
+                if constexpr(FmhaMask::IsMasking)
+                {
+                    return l[i_idx] == 0.f ? 0.f : 1 / l[i_idx];
+                }
+                else
+                    return 1 / l[i_idx];
+            }();
+            sweep_tile_span(o_spans[number<1>{}], [&](auto idx1) {
+                constexpr auto i_j_idx = make_tuple(idx0, idx1);
+                o_acc(i_j_idx) *= tmp;
+            });
+        });
+
+        o_acc = tile_elementwise_in(o_acc_element_func, o_acc);
+
+        return o_acc;
+    }
+
+    template <typename QDramBlockWindowTmp,
+              typename KDramBlockWindowTmp,
+              typename VDramBlockWindowTmp,
+              typename BiasDramBlockWindowTmp,
+              typename LSEDramBlockWindowTmp>
+    CK_TILE_HOST_DEVICE auto
+    operator()(const QDramBlockWindowTmp& q_dram_block_window_tmp,       // M0*K0 tile
+               const KDramBlockWindowTmp& k_dram_block_window_tmp,       // N0*K0 tile
+               const VDramBlockWindowTmp& v_dram_block_window_tmp,       // N1*K1 tile
+               const BiasDramBlockWindowTmp& bias_dram_block_window_tmp, // M0*N0 tile
+               LSEDramBlockWindowTmp& lse_dram_block_window_tmp,         // M0*1 tile
+               FmhaMask mask,
+               float scale_s,
+               void* smem_ptr) const
+    {
+        return operator()(q_dram_block_window_tmp,
+                          identity{},
+                          k_dram_block_window_tmp,
+                          identity{},
+                          v_dram_block_window_tmp,
+                          identity{},
+                          bias_dram_block_window_tmp,
+                          identity{},
+                          lse_dram_block_window_tmp,
+                          identity{},
+                          identity{},
+                          identity{},
+                          identity{},
+                          mask,
+                          scale_s,
+                          smem_ptr);
+    }
+};
+
+} // namespace ck_tile

include/ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qr_ks_vs_async.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/common/tensor_layout.hpp"
+#include "ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qr_ks_vs_async_default_policy.hpp"
+#include "ck_tile/ops/reduce/block/block_reduce.hpp"
+
+namespace ck_tile {
+
+// a variation of qr/ks/vs, where we use async copy to load k (potentially v in the future)
+template <typename Problem_, typename Policy_ = BlockFmhaPipelineQRKSVSAsyncDefaultPolicy>
+struct BlockFmhaPipelineQRKSVSAsync
+{
+    using Problem             = remove_cvref_t<Problem_>;
+    using Policy              = remove_cvref_t<Policy_>;
+    using QDataType           = remove_cvref_t<typename Problem::QDataType>;
+    using KDataType           = remove_cvref_t<typename Problem::KDataType>;
+    using VDataType           = remove_cvref_t<typename Problem::VDataType>;
+    using SaccDataType        = remove_cvref_t<typename Problem::SaccDataType>;
+    using SMPLComputeDataType = remove_cvref_t<typename Problem::SMPLComputeDataType>;
+    using BiasDataType        = remove_cvref_t<typename Problem::BiasDataType>;
+    using LSEDataType         = remove_cvref_t<typename Problem::LSEDataType>;
+    using PDataType           = remove_cvref_t<typename Problem::PDataType>;
+    using OaccDataType        = remove_cvref_t<typename Problem::OaccDataType>;
+    using ODataType           = remove_cvref_t<typename Problem::ODataType>;
+    using FmhaMask            = remove_cvref_t<typename Problem::FmhaMask>;
+
+    using BlockFmhaShape             = remove_cvref_t<typename Problem::BlockFmhaShape>;
+    using VLayout                    = remove_cvref_t<typename BlockFmhaShape::VLayout>;
+    static constexpr bool kQLoadOnce = true; // if q_tile load whole block length (hdim) at once
+    static_assert(kQLoadOnce == Policy::QLoadOnce);
+    static constexpr bool kIsFp8 = Problem::kIsFp8;
+
+    static constexpr index_t kBlockSize = Problem::kBlockSize;
+
+    static constexpr index_t kM0            = BlockFmhaShape::kM0;
+    static constexpr index_t kN0            = BlockFmhaShape::kN0;
+    static constexpr index_t kK0            = BlockFmhaShape::kK0;
+    static constexpr index_t kN1            = BlockFmhaShape::kN1;
+    static constexpr index_t kK1            = BlockFmhaShape::kK1;
+    static constexpr index_t kK0BlockLength = BlockFmhaShape::kK0BlockLength;
+
+    static constexpr bool kIsGroupMode = Problem::kIsGroupMode;
+    // TODO: seq_q always support padding, hdim_q/v support multiple of vector(like 8x)
+    //       only need special care about seq_k padding (oob need set -INF of p instead of zero)
+    static_assert(Problem::kPadSeqLenQ == true && Problem::kPadHeadDimQ == true &&
+                  Problem::kPadHeadDimV == true);
+    static constexpr bool kPadSeqLenQ  = true;
+    static constexpr bool kPadSeqLenK  = Problem::kPadSeqLenK;
+    static constexpr bool kPadHeadDimQ = true; // support multiple of vector(like 8x)
+    static constexpr bool kPadHeadDimV = true; // support multiple of vector(like 8x)
+    static constexpr bool kHasBias     = Problem::kHasBias;
+    static constexpr bool kStoreLSE    = Problem::kStoreLSE;
+
+    // last dimension vector length used to create tensor view(and decide buffer_load vector length)
+    // ... together with tensor distribution. tensor dist should able to overwrite this
+    static constexpr index_t kAlignmentQ = Policy::template GetAlignmentQ<Problem>();
+    static constexpr index_t kAlignmentK = Policy::template GetAlignmentK<Problem>();
+    static constexpr index_t kAlignmentV = []() {
+        if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+            return Policy::template GetAlignmentV<Problem>();
+        else
+            return kPadSeqLenK ? 1 : Policy::template GetAlignmentV<Problem>();
+    }();
+    static constexpr index_t kAlignmentO = Policy::template GetAlignmentO<Problem>();
+    static constexpr index_t kAlignmentBias =
+        kPadSeqLenK ? 1 : Policy::template GetAlignmentBias<Problem>();
+
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+    static constexpr auto R_LOG2E = 1.0 / log2e_v<SaccDataType>;
+#endif
+
+    static constexpr index_t kBlockPerCu = []() {
+        if constexpr(Problem::kBlockPerCu != -1)
+            return Problem::kBlockPerCu;
+        else
+        {
+            if constexpr(kK0BlockLength <= 32)
+            {
+                if constexpr(kPadSeqLenK && kHasBias && FmhaMask::IsMasking)
+                    return 1;
+                else
+                    return 2;
+            }
+            else if constexpr(kK0BlockLength <= 64)
+            {
+                if constexpr(kPadSeqLenK && kHasBias)
+                    return 2;
+                else
+                    return 3;
+            }
+            else if constexpr(kK0BlockLength <= 128)
+            {
+                if constexpr(kPadSeqLenK && kHasBias)
+                    return 1;
+                else
+                    return 2;
+            }
+            else if constexpr(kK0BlockLength <= 256)
+            {
+                return 1;
+            }
+        }
+    }();
+
+    static constexpr const char* name = "qr_async";
+
+    CK_TILE_HOST_DEVICE static constexpr ck_tile::index_t GetSmemSize()
+    {
+        return Policy::template GetSmemSize<Problem>();
+    }
+
+    template <typename QDramBlockWindowTmp,
+              typename KDramBlockWindowTmp,
+              typename VDramBlockWindowTmp,
+              typename BiasDramBlockWindowTmp,
+              typename LSEDramBlockWindowTmp,
+              typename QElementFunction,
+              typename KElementFunction,
+              typename VElementFunction,
+              typename BiasElementFunction,
+              typename LSEElementFunction,
+              typename SAccElementFunction,
+              typename PComputeElementFunction,
+              typename OAccElementFunction>
+    CK_TILE_HOST_DEVICE auto
+    operator()(const QDramBlockWindowTmp& q_dram_block_window_tmp, // M0*K0 tile
+               const QElementFunction& q_element_func,
+               const KDramBlockWindowTmp& k_dram_block_window_tmp, // N0*K0 tile
+               const KElementFunction& /*k_element_func*/,
+               const VDramBlockWindowTmp& v_dram_block_window_tmp, // N1*K1 tile
+               const VElementFunction& v_element_func,
+               const BiasDramBlockWindowTmp& bias_dram_block_window_tmp, // M0*N0 tile
+               const BiasElementFunction& bias_element_func,
+               LSEDramBlockWindowTmp& lse_dram_window_tmp, // M0*1 tile
+               const LSEElementFunction& lse_element_func,
+               const SAccElementFunction& s_acc_element_func,
+               const PComputeElementFunction& p_compute_element_func,
+               const OAccElementFunction& o_acc_element_func,
+               FmhaMask mask,
+               float scale_s,
+               void* smem_ptr) const
+    {
+        static_assert(
+            std::is_same_v<QDataType, remove_cvref_t<typename QDramBlockWindowTmp::DataType>> &&
+                std::is_same_v<KDataType, remove_cvref_t<typename KDramBlockWindowTmp::DataType>> &&
+                std::is_same_v<VDataType, remove_cvref_t<typename VDramBlockWindowTmp::DataType>>,
+            "wrong!");
+
+        static_assert(kM0 == QDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kN0 == KDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kK0 == KDramBlockWindowTmp{}.get_window_lengths()[number<1>{}] &&
+                          kN1 == VDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kK1 == VDramBlockWindowTmp{}.get_window_lengths()[number<1>{}] &&
+                          kM0 == BiasDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kN0 == BiasDramBlockWindowTmp{}.get_window_lengths()[number<1>{}],
+                      "wrong!");
+
+        constexpr auto LdsSeq = Policy::template GetLdsBufferSequence<Problem>();
+
+        // K tile in LDS
+        auto k_lds_ptr   = reinterpret_cast<KDataType*>(smem_ptr);
+        auto k_lds_store = generate_tuple(
+            [&](auto i_buf) {
+                return make_tile_window(
+                    make_tensor_view<address_space_enum::lds>(
+                        k_lds_ptr, Policy::template MakeKLdsStoreBlockDescriptor<Problem>(i_buf)),
+                    Policy::template MakeKLdsStoreBlockDescriptor<Problem>(i_buf).get_lengths(),
+                    {0, 0, 0});
+            },
+            number<Policy::NumPrefetchK>{});
+
+#if K_LDS_LOAD_USE_OFFSET_TRANSFORM
+        auto k_lds_load = generate_tuple(
+            [&](auto i_buf) {
+                return make_tile_window(
+                    make_tensor_view<address_space_enum::lds>(
+                        k_lds_ptr, Policy::template MakeKLdsLoadBlockDescriptor<Problem>(i_buf)),
+                    Policy::template MakeKLdsLoadBlockDescriptor<Problem>(i_buf).get_lengths(),
+                    {0, 0});
+            },
+            number<Policy::NumPrefetchK>{});
+#else
+        auto k_lds_Load_view = make_tensor_view<address_space_enum::lds>(
+            k_lds_ptr, Policy::template MakeKLdsLoadBlockDescriptor<Problem>());
+
+        auto k_lds_load =
+            make_tile_window(k_lds_Load_view,
+                             Policy::template MakeKLdsLoadBlockDescriptor<Problem>().get_lengths(),
+                             {0, 0});
+#endif
+
+        // V tile in LDS
+        auto v_lds = make_tensor_view<address_space_enum::lds>(
+            reinterpret_cast<VDataType*>(smem_ptr),
+            Policy::template MakeVLdsBlockDescriptor<Problem>());
+        auto v_lds_window = make_tile_window(
+            v_lds, Policy::template MakeVLdsBlockDescriptor<Problem>().get_lengths(), {0, 0});
+
+        // Block GEMM
+        constexpr auto gemm_0 = Policy::template GetQKBlockGemm<Problem>();
+        constexpr auto gemm_1 = Policy::template GetKVBlockGemm<Problem>();
+
+        auto q_dram_window = make_tile_window(
+            q_dram_block_window_tmp.get_bottom_tensor_view(),
+            q_dram_block_window_tmp.get_window_lengths(),
+            q_dram_block_window_tmp.get_window_origin(),
+            Policy::template MakeQDramTileDistribution<Problem, decltype(gemm_0)>());
+
+        // TODO: we use async Copy for K, which is inline asm
+        // a side effect is we have to use inline asm for q as well
+        auto q = decltype(load_tile(q_dram_window)){};
+        set_tile(q, number<0>{}); // use per-dword clear to avoid scratch
+        load_tile_raw(q, q_dram_window);
+        __builtin_amdgcn_sched_barrier(0);
+
+        using SaccBlockTileType = decltype(gemm_0.MakeCBlockTile());
+        auto s_acc              = SaccBlockTileType{};
+
+        // reduction function for softmax
+        const auto f_max = [](auto e0, auto e1) { return max(e0, e1); };
+        const auto f_sum = [](auto e0, auto e1) { return e0 + e1; };
+
+        // infer Sacc, S, P, M, L, Oacc type
+        using SBlockTileType = decltype(cast_tile<SMPLComputeDataType>(s_acc));
+
+        using MLBlockTileType = decltype(block_tile_reduce<SMPLComputeDataType>(
+            SBlockTileType{}, sequence<1>{}, f_max, SMPLComputeDataType{0}));
+
+        using OaccBlockTileType = decltype(gemm_1.MakeCBlockTile());
+
+        // init Oacc, M, L
+        auto o_acc = OaccBlockTileType{};
+        auto m     = MLBlockTileType{};
+        auto l     = MLBlockTileType{};
+
+        clear_tile(o_acc);
+        set_tile(m, -numeric<SMPLComputeDataType>::infinity());
+        clear_tile(l);
+
+        __builtin_amdgcn_sched_barrier(0);
+        const auto q_origin = q_dram_window.get_window_origin();
+        const auto [seqlen_k_start, seqlen_k_end] =
+            mask.GetTileRangeAlongX(q_origin.at(number<0>{}), number<kM0>{}, number<kN0>{});
+
+        const auto num_total_loop = integer_divide_ceil(seqlen_k_end - seqlen_k_start, kN0);
+
+        // check early exit if masked and no work to do.
+        if constexpr(FmhaMask::IsMasking)
+        {
+            if(num_total_loop <= 0)
+            {
+                if constexpr(kStoreLSE)
+                {
+                    auto lse =
+                        make_static_distributed_tensor<LSEDataType>(m.get_tile_distribution());
+
+                    set_tile(lse, -numeric<SMPLComputeDataType>::infinity());
+
+                    store_tile(lse_dram_window_tmp, tile_elementwise_in(lse_element_func, lse));
+                }
+                buffer_load_fence(0); // rocm-6.1, if whole tile is masked out, need to fence(0)
+                                      // otherwise will have compute error(maybe compiler bug?)
+
+                // Note: here occ are all cleard, return it
+                return o_acc;
+            }
+            __builtin_amdgcn_sched_barrier(0); // make sure sched_barrier(0) for this check
+        }
+
+        auto k_dram_block_window =
+            make_tile_window(k_dram_block_window_tmp.get_bottom_tensor_view(),
+                             k_dram_block_window_tmp.get_window_lengths(),
+                             {seqlen_k_start, 0});
+
+        auto k_dram_window = make_tile_window(
+            k_dram_block_window.get_bottom_tensor_view(),
+            k_dram_block_window.get_window_lengths(),
+            k_dram_block_window.get_window_origin(),
+            Policy::template MakeKDramTileDistribution<Problem>()); // K DRAM tile window for
+                                                                    // load
+        const auto bias_origin = bias_dram_block_window_tmp.get_window_origin();
+        auto bias_dram_window  = make_tile_window(
+            bias_dram_block_window_tmp.get_bottom_tensor_view(),
+            bias_dram_block_window_tmp.get_window_lengths(),
+            {bias_origin.at(number<0>{}), seqlen_k_start}, // M/N
+            Policy::template MakeBiasDramTileDistribution<Problem, decltype(gemm_0)>());
+
+        auto v_dram_window =
+            make_tile_window(v_dram_block_window_tmp.get_bottom_tensor_view(),
+                             v_dram_block_window_tmp.get_window_lengths(),
+                             {0, seqlen_k_start}, // TODO: hdim split?
+                             Policy::template MakeVDramTileDistribution<Problem>());
+
+        // prefetch K tile
+        async_load_tile_raw(k_lds_store(LdsSeq.at(number<0>{})), k_dram_window);
+        move_tile_window(k_dram_window, {0, kK0});
+        __builtin_amdgcn_sched_barrier(0);
+
+        buffer_load_fence(k_dram_window.get_num_access(), q.get_thread_buffer());
+        (void)q_element_func; // ??? rocm-6.x if use q element func will have scratch on hdim=64/32
+        // auto q_tile = q;      // tile_elementwise_in(q_element_func, q);
+
+        index_t i_total_loops      = 0;
+        constexpr index_t k0_loops = kK0BlockLength / kK0;
+        constexpr index_t k1_loops = kN0 / kK1;
+
+        static_assert(1 <= k0_loops);
+        static_assert(1 <= k1_loops);
+        // main loop
+        do
+        {
+            // STAGE 1, QK gemm
+            clear_tile(s_acc); // initialize C
+            if constexpr(k0_loops > 1)
+            {
+                static_for<0, k0_loops - 1, 1>{}([&](auto i_k0) {
+                    async_load_tile_raw(k_lds_store(number<LdsSeq.at(number<i_k0 + 1>{})>{}),
+                                        k_dram_window);
+                    if constexpr(i_k0 < k0_loops - 1)
+                        move_tile_window(k_dram_window, {0, kK0});
+
+                    async_load_fence(k_dram_window.get_num_access());
+                    __builtin_amdgcn_s_barrier();
+                    __builtin_amdgcn_sched_barrier(0);
+                    gemm_0(s_acc,
+                           get_slice_tile(
+                               q, sequence<0, i_k0 * kK0>{}, sequence<kM0, (i_k0 + 1) * kK0>{}),
+#if K_LDS_LOAD_USE_OFFSET_TRANSFORM
+                           k_lds_load[number<LdsSeq.at(number<i_k0>{})>{}]);
+
+#else
+                           get_slice_tile(k_lds_load,
+                                          sequence<(LdsSeq.at(number<i_k0>{})) * kN0, 0>{},
+                                          sequence<(LdsSeq.at(number<i_k0>{}) + 1) * kN0, kK0>{}));
+#endif
+                });
+            }
+
+            // TODO: this to fix a bug when loop smaller than 2,
+            // the following fence/barrier will be scheduled inside 1st loop
+            if constexpr(k0_loops <= 2)
+                __builtin_amdgcn_sched_barrier(0);
+
+            async_load_fence();
+            __builtin_amdgcn_s_barrier();
+
+            const auto bias_tile = load_tile(bias_dram_window); // load bias tile
+            auto v_buf           = load_tile(v_dram_window, bool_constant<false>{});
+            __builtin_amdgcn_sched_barrier(0);
+            { // tail
+                gemm_0(s_acc,
+                       get_slice_tile(
+                           q, sequence<0, (k0_loops - 1) * kK0>{}, sequence<kM0, k0_loops * kK0>{}),
+#if K_LDS_LOAD_USE_OFFSET_TRANSFORM
+                       k_lds_load[number<LdsSeq.at(number<k0_loops - 1>{})>{}]);
+
+#else
+                       get_slice_tile(
+                           k_lds_load,
+                           sequence<(LdsSeq.at(number<k0_loops - 1>{})) * kN0, 0>{},
+                           sequence<(LdsSeq.at(number<k0_loops - 1>{}) + 1) * kN0, kK0>{}));
+#endif
+            }
+            __builtin_amdgcn_sched_barrier(1);
+
+            // STAGE 2, scale_s, add bias, mask, softmax
+            if constexpr(kHasBias)
+            {
+                s_acc = tile_elementwise_in(s_acc_element_func, s_acc);
+                tile_elementwise_inout([&scale_s](auto& x) { x = x * scale_s; }, s_acc);
+                tile_elementwise_inout(
+                    [&](auto& x, const auto& y) {
+#if !CK_TILE_FMHA_FWD_FAST_EXP2
+                        x += type_convert<SaccDataType>(bias_element_func(y));
+#else
+                        x += log2e_v<SaccDataType> *
+                             type_convert<SaccDataType>(bias_element_func(y));
+#endif
+                    },
+                    s_acc,
+                    bias_tile);
+            }
+            else
+            {
+                s_acc = tile_elementwise_in(s_acc_element_func, s_acc);
+#if !CK_TILE_FMHA_FWD_FAST_EXP2
+                tile_elementwise_inout([&scale_s](auto& x) { x = x * scale_s; }, s_acc);
+#endif
+            }
+            move_tile_window(bias_dram_window, {0, kN0});
+            if constexpr(kPadSeqLenK || FmhaMask::IsMasking)
+            {
+                const auto k_origin      = k_dram_block_window.get_window_origin();
+                bool need_perpixel_check = mask.IsEdgeTile(q_origin.at(number<0>{}),
+                                                           k_origin.at(number<0>{}),
+                                                           number<kM0>{},
+                                                           number<kN0>{});
+
+                if(need_perpixel_check)
+                {
+                    set_tile_if(
+                        s_acc, -numeric<SMPLComputeDataType>::infinity(), [&](auto tile_idx) {
+                            const auto row = q_origin.at(number<0>{}) + tile_idx.at(number<0>{});
+                            const auto col = k_origin.at(number<0>{}) + tile_idx.at(number<1>{});
+                            return mask.IsOutOfBound(row, col);
+                        });
+                }
+            }
+
+            const auto s = cast_tile<SMPLComputeDataType>(s_acc); // S{j}
+            auto m_local = block_tile_reduce<SMPLComputeDataType>(
+                s,
+                sequence<1>{},
+                f_max,
+                -numeric<SMPLComputeDataType>::infinity()); // m_local = rowmax(S{j})
+            block_tile_reduce_sync(m_local, f_max, bool_constant<false>{});
+
+            const auto m_old = m; // m{j-1}
+            tile_elementwise_inout(
+                [](auto& e0, auto e1, auto e2) { e0 = max(e1, e2); }, m, m_old, m_local); // m{j}
+
+            auto p_compute = make_static_distributed_tensor<SMPLComputeDataType>(
+                s.get_tile_distribution()); // Pcompute{j}
+
+            __builtin_amdgcn_sched_barrier(0x7F);
+            // store & prefetch next v, after the max reduction
+            if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+            {
+                auto v_shuffle_tmp = make_static_distributed_tensor<VDataType>(
+                    Policy::template MakeShuffledVRegBlockDescriptor<Problem>());
+                shuffle_tile(v_shuffle_tmp, v_buf);
+
+                auto v_lds_window_tmp =
+                    get_slice_tile(v_lds_window,
+                                   sequence<(LdsSeq.at(number<k0_loops>{})) * kN1, 0>{},
+                                   sequence<(LdsSeq.at(number<k0_loops>{}) + 1) * kN1, kK1>{});
+
+                store_tile(
+                    v_lds_window_tmp,
+                    tile_elementwise_in(v_element_func, v_shuffle_tmp)); // store the prefetch
+            }
+            else
+            {
+                auto v_lds_window_tmp =
+                    get_slice_tile(v_lds_window,
+                                   sequence<(LdsSeq.at(number<k0_loops>{})) * kN1, 0>{},
+                                   sequence<(LdsSeq.at(number<k0_loops>{}) + 1) * kN1, kK1>{});
+                store_tile(v_lds_window_tmp,
+                           tile_elementwise_in(v_element_func, v_buf)); // store the prefetch
+            }
+
+            if constexpr(k1_loops > 1)
+            {
+                move_tile_window(
+                    v_dram_window,
+                    {0, kK1}); // will have scratch if move this right after load_tile(v_dram)...
+                v_buf = load_tile(v_dram_window, bool_constant<false>{}); // load next v_buf
+            }
+            __builtin_amdgcn_sched_barrier(0);
+
+            static const auto get_validated_m = [](SMPLComputeDataType raw_m) {
+                /// NOTICE: bias might be materialized mask including -inf values, need
+                /// consideration
+                if constexpr(kHasBias || FmhaMask::IsMasking)
+                {
+                    return raw_m == -numeric<SMPLComputeDataType>::infinity()
+                               ? type_convert<SMPLComputeDataType>(0.f)
+                               : raw_m;
+                }
+                else
+                {
+                    return raw_m;
+                }
+            };
+
+            constexpr auto p_spans = decltype(p_compute)::get_distributed_spans();
+            sweep_tile_span(p_spans[number<0>{}], [&](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                auto row_max = scale_s * get_validated_m(m[i_idx]);
+#endif
+                sweep_tile_span(p_spans[number<1>{}], [&](auto idx1) {
+                    constexpr auto i_j_idx = make_tuple(idx0, idx1);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                    if constexpr(kHasBias)
+                    {
+                        p_compute(i_j_idx) = exp2(s[i_j_idx] - get_validated_m(m[i_idx]));
+                    }
+                    else
+                    {
+                        p_compute(i_j_idx) = exp2(scale_s * s[i_j_idx] - row_max);
+                    }
+#else
+                    p_compute(i_j_idx)     = exp(s[i_j_idx] - get_validated_m(m[i_idx]));
+#endif
+                });
+            });
+
+            auto rowsum_p = block_tile_reduce<SMPLComputeDataType>(
+                p_compute, sequence<1>{}, f_sum, SMPLComputeDataType{0}); // rowsum(Pcompute{j})
+
+            block_tile_reduce_sync(rowsum_p, f_sum, bool_constant<false>{});
+            // l{j}, Oacc{j}
+            constexpr auto o_spans = decltype(o_acc)::get_distributed_spans();
+            sweep_tile_span(o_spans[number<0>{}], [&](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                const auto tmp = [&]() {
+                    if constexpr(kHasBias)
+                    {
+                        return exp2(m_old[i_idx] - get_validated_m(m[i_idx]));
+                    }
+                    else
+                    {
+                        auto row_max = scale_s * get_validated_m(m[i_idx]);
+                        return exp2(scale_s * m_old[i_idx] - row_max);
+                    }
+                }();
+#else
+                const auto tmp = exp(m_old[i_idx] - get_validated_m(m[i_idx]));
+#endif
+                l(i_idx) = tmp * l[i_idx] + rowsum_p[i_idx];
+                sweep_tile_span(o_spans[number<1>{}], [&](auto idx1) {
+                    constexpr auto i_j_idx = make_tuple(idx0, idx1);
+                    // FIXME: this use different equation from FA v2 paper,
+                    // but produce correc result.
+                    // Is the equation wrong?
+                    o_acc(i_j_idx) *= tmp;
+                });
+            });
+
+            const auto p =
+                cast_tile<PDataType>(tile_elementwise_in(p_compute_element_func, p_compute));
+
+            // STAGE 3, KV gemm
+            if constexpr(k1_loops > 1)
+            {
+                static_for<0, k1_loops - 1, 1>{}([&](auto i_k1) {
+                    if constexpr(i_k1 != 0 && i_k1 < k1_loops - 1)
+                    {
+                        v_buf = load_tile(v_dram_window, bool_constant<false>{}); // load next v_buf
+                    }
+                    block_sync_lds();
+                    gemm_1(o_acc,
+                           get_slice_tile(
+                               p, sequence<0, i_k1 * kK1>{}, sequence<kM0, (i_k1 + 1) * kK1>{}),
+                           get_slice_tile(
+                               v_lds_window,
+                               sequence<(LdsSeq.at(number<k0_loops + i_k1>{})) * kN1, 0>{},
+                               sequence<(LdsSeq.at(number<k0_loops + i_k1>{}) + 1) * kN1, kK1>{}));
+
+                    if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+                    {
+                        auto v_shuffle_tmp = make_static_distributed_tensor<VDataType>(
+                            Policy::template MakeShuffledVRegBlockDescriptor<Problem>());
+                        shuffle_tile(v_shuffle_tmp, v_buf);
+                        auto v_lds_window_tmp = get_slice_tile(
+                            v_lds_window,
+                            sequence<(LdsSeq.at(number<k0_loops + i_k1 + 1>{})) * kN1, 0>{},
+                            sequence<(LdsSeq.at(number<k0_loops + i_k1 + 1>{}) + 1) * kN1, kK1>{});
+                        store_tile(v_lds_window_tmp,
+                                   tile_elementwise_in(v_element_func,
+                                                       v_shuffle_tmp)); // store the prefetch
+                    }
+                    else
+                    {
+                        auto v_lds_window_tmp = get_slice_tile(
+                            v_lds_window,
+                            sequence<(LdsSeq.at(number<k0_loops + i_k1 + 1>{})) * kN1, 0>{},
+                            sequence<(LdsSeq.at(number<k0_loops + i_k1 + 1>{}) + 1) * kN1, kK1>{});
+                        store_tile(v_lds_window_tmp,
+                                   tile_elementwise_in(v_element_func, v_buf)); // store next v_buf
+                    }
+                    if constexpr(i_k1 < k1_loops - 1)
+                        move_tile_window(v_dram_window, {0, kK1});
+                });
+            }
+            i_total_loops++;
+            if(i_total_loops < num_total_loop)
+            {
+                // move K tile windows
+                move_tile_window(k_dram_block_window, {kN0, 0});
+                k_dram_window =
+                    make_tile_window(k_dram_block_window.get_bottom_tensor_view(),
+                                     k_dram_block_window.get_window_lengths(),
+                                     k_dram_block_window.get_window_origin(),
+                                     Policy::template MakeKDramTileDistribution<Problem>());
+
+                if constexpr(k1_loops >= 2 &&
+                             LdsSeq.at(number<0>{}) == LdsSeq.at(number<k0_loops + k1_loops - 2>{}))
+                    __builtin_amdgcn_s_barrier();
+                async_load_tile_raw(k_lds_store(LdsSeq.at(number<0>{})), k_dram_window);
+                move_tile_window(k_dram_window, {0, kK0});
+            }
+            // tail
+            {
+                block_sync_lds();
+                gemm_1(
+                    o_acc,
+                    get_slice_tile(p, sequence<0, (k1_loops - 1) * kK1>{}, sequence<kM0, kN0>{}),
+                    get_slice_tile(
+                        v_lds_window,
+                        sequence<(LdsSeq.at(number<k0_loops + k1_loops - 1>{})) * kN1, 0>{},
+                        sequence<(LdsSeq.at(number<k0_loops + k1_loops - 1>{}) + 1) * kN1, kK1>{}));
+            }
+        } while(i_total_loops < num_total_loop);
+
+        // store lse
+        if constexpr(kStoreLSE)
+        {
+            auto lse = make_static_distributed_tensor<LSEDataType>(m.get_tile_distribution());
+
+            constexpr auto lse_spans = decltype(lse)::get_distributed_spans();
+            sweep_tile_span(lse_spans[number<0>{}], [&, m_ = m, l_ = l](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                if constexpr(kHasBias)
+                {
+                    lse(i_idx) = m_[i_idx] * R_LOG2E + log(l_[i_idx]);
+                }
+                else
+                {
+                    lse(i_idx) = m_[i_idx] * scale_s * R_LOG2E + log(l_[i_idx]);
+                }
+#else
+                lse(i_idx) = m_[i_idx] + log(l_[i_idx]);
+#endif
+            });
+
+            store_tile(lse_dram_window_tmp, tile_elementwise_in(lse_element_func, lse));
+        }
+
+        // finally, O
+        constexpr auto o_spans = decltype(o_acc)::get_distributed_spans();
+
+        sweep_tile_span(o_spans[number<0>{}], [&](auto idx0) {
+            constexpr auto i_idx = make_tuple(idx0);
+            const auto tmp       = [&]() {
+                if constexpr(FmhaMask::IsMasking)
+                {
+                    return l[i_idx] == 0.f ? 0.f : 1 / l[i_idx];
+                }
+                else
+                    return 1 / l[i_idx];
+            }();
+            sweep_tile_span(o_spans[number<1>{}], [&](auto idx1) {
+                constexpr auto i_j_idx = make_tuple(idx0, idx1);
+                o_acc(i_j_idx) *= tmp;
+            });
+        });
+
+        o_acc = tile_elementwise_in(o_acc_element_func, o_acc);
+
+        return o_acc;
+    }
+
+    template <typename QDramBlockWindowTmp,
+              typename KDramBlockWindowTmp,
+              typename VDramBlockWindowTmp,
+              typename BiasDramBlockWindowTmp,
+              typename LSEDramBlockWindowTmp>
+    CK_TILE_HOST_DEVICE auto
+    operator()(const QDramBlockWindowTmp& q_dram_block_window_tmp,       // M0*K0 tile
+               const KDramBlockWindowTmp& k_dram_block_window_tmp,       // N0*K0 tile
+               const VDramBlockWindowTmp& v_dram_block_window_tmp,       // N1*K1 tile
+               const BiasDramBlockWindowTmp& bias_dram_block_window_tmp, // M0*N0 tile
+               LSEDramBlockWindowTmp& lse_dram_block_window_tmp,         // M0*1 tile
+               FmhaMask mask,
+               float scale_s,
+               void* smem_ptr) const
+    {
+        return operator()(q_dram_block_window_tmp,
+                          identity{},
+                          k_dram_block_window_tmp,
+                          identity{},
+                          v_dram_block_window_tmp,
+                          identity{},
+                          bias_dram_block_window_tmp,
+                          identity{},
+                          lse_dram_block_window_tmp,
+                          identity{},
+                          identity{},
+                          identity{},
+                          identity{},
+                          mask,
+                          scale_s,
+                          smem_ptr);
+    }
+};
+
+} // namespace ck_tile

include/ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qr_ks_vs_async_default_policy.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qx_ks_vs_custom_policy.hpp"
+
+namespace ck_tile {
+
+// This pipeline is qkv all located in LDS
+using BlockFmhaPipelineQRKSVSAsyncDefaultPolicy =
+    BlockFmhaPipelineQXKSVSCustomPolicy</* QLoadOnce = */ true,
+                                        /* AsyncCopyK = */ true,
+                                        /* AsyncCopyV = */ false,
+                                        /* NumPrefetchK = */ 3,
+                                        /* NumPrefetchV = */ 3>;
+
+} // namespace ck_tile

include/ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qr_ks_vs_default_policy.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qx_ks_vs_custom_policy.hpp"
+
+namespace ck_tile {
+
+// This pipeline is qkv all located in LDS
+using BlockFmhaPipelineQRKSVSDefaultPolicy =
+    BlockFmhaPipelineQXKSVSCustomPolicy</* QLoadOnce = */ true,
+                                        /* AsyncCopyK = */ false,
+                                        /* AsyncCopyV = */ false,
+                                        /* NumPrefetchK = */ 1,
+                                        /* NumPrefetchV = */ 1>;
+
+} // namespace ck_tile

include/ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qr_ks_vs_fp8.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qr_ks_vs_default_policy.hpp"
+#include "ck_tile/ops/reduce/block/block_reduce.hpp"
+
+namespace ck_tile {
+
+// This pipeline is qkv all located in LDS
+template <typename Problem_, typename Policy_ = BlockFmhaPipelineQRKSVSDefaultPolicy>
+struct [[deprecated]] BlockFmhaPipelineQRKSVSFp8
+{
+    using Problem             = remove_cvref_t<Problem_>;
+    using Policy              = remove_cvref_t<Policy_>;
+    using QDataType           = remove_cvref_t<typename Problem::QDataType>;
+    using KDataType           = remove_cvref_t<typename Problem::KDataType>;
+    using VDataType           = remove_cvref_t<typename Problem::VDataType>;
+    using SaccDataType        = remove_cvref_t<typename Problem::SaccDataType>;
+    using SMPLComputeDataType = remove_cvref_t<typename Problem::SMPLComputeDataType>;
+    using BiasDataType        = remove_cvref_t<typename Problem::BiasDataType>;
+    using LSEDataType         = remove_cvref_t<typename Problem::LSEDataType>;
+    using PDataType           = remove_cvref_t<typename Problem::PDataType>;
+    using OaccDataType        = remove_cvref_t<typename Problem::OaccDataType>;
+    using ODataType           = remove_cvref_t<typename Problem::ODataType>;
+    using FmhaMask            = remove_cvref_t<typename Problem::FmhaMask>;
+
+    using BlockFmhaShape             = remove_cvref_t<typename Problem::BlockFmhaShape>;
+    using VLayout                    = remove_cvref_t<typename BlockFmhaShape::VLayout>;
+    static constexpr bool kQLoadOnce = true; // if q_tile load whole block length (hdim) at once
+    static_assert(kQLoadOnce == Policy::QLoadOnce);
+    static constexpr bool kIsFp8 = Problem::kIsFp8;
+
+    static constexpr index_t kBlockSize = Problem::kBlockSize;
+
+    static constexpr index_t kM0            = BlockFmhaShape::kM0;
+    static constexpr index_t kN0            = BlockFmhaShape::kN0;
+    static constexpr index_t kK0            = BlockFmhaShape::kK0;
+    static constexpr index_t kN1            = BlockFmhaShape::kN1;
+    static constexpr index_t kK1            = BlockFmhaShape::kK1;
+    static constexpr index_t kK0BlockLength = BlockFmhaShape::kK0BlockLength;
+
+    static constexpr bool kIsGroupMode = Problem::kIsGroupMode;
+    static constexpr bool kPadSeqLenQ  = Problem::kPadSeqLenQ;
+    static constexpr bool kPadSeqLenK  = Problem::kPadSeqLenK;
+    static constexpr bool kPadHeadDimQ = Problem::kPadHeadDimQ;
+    static constexpr bool kPadHeadDimV = Problem::kPadHeadDimV;
+    static constexpr bool kHasBias     = Problem::kHasBias;
+    static constexpr bool kStoreLSE    = Problem::kStoreLSE;
+
+    // last dimension vector length used to create tensor view(and decide buffer_load vector length)
+    // ... together with tensor distribution. tensor dist should able to overwrite this
+    static constexpr index_t kAlignmentQ =
+        kPadHeadDimQ ? 1 : Policy::template GetAlignmentQ<Problem>();
+    static constexpr index_t kAlignmentK =
+        kPadHeadDimQ ? 1 : Policy::template GetAlignmentK<Problem>();
+    static constexpr index_t kAlignmentV = []() {
+        if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+            return kPadHeadDimV ? 1 : Policy::template GetAlignmentV<Problem>();
+        else
+            return kPadSeqLenK ? 1 : Policy::template GetAlignmentV<Problem>();
+    }();
+
+    static constexpr index_t kAlignmentO =
+        kPadHeadDimV ? 1 : Policy::template GetAlignmentO<Problem>();
+    static constexpr index_t kAlignmentBias =
+        kPadSeqLenK ? 1 : Policy::template GetAlignmentBias<Problem>();
+
+    static constexpr index_t kBlockPerCu = []() {
+        if constexpr(Problem::kBlockPerCu != -1)
+            return Problem::kBlockPerCu;
+        else
+        {
+            if constexpr(kK0BlockLength <= 32)
+            {
+                return 2;
+            }
+            else if constexpr(kK0BlockLength <= 64)
+            {
+                return 3;
+            }
+            else if constexpr(kK0BlockLength <= 128)
+            {
+                if constexpr(kHasBias)
+                    return 1;
+                else
+                    return 2;
+            }
+            else if constexpr(kK0BlockLength <= 256)
+            {
+                return 1;
+            }
+        }
+    }();
+
+    static constexpr const char* name = "qr_fp8";
+
+    CK_TILE_HOST_DEVICE static constexpr ck_tile::index_t GetSmemSize()
+    {
+        return Policy::template GetSmemSize<Problem>();
+    }
+
+    template <typename QDramBlockWindowTmp,
+              typename KDramBlockWindowTmp,
+              typename VDramBlockWindowTmp,
+              typename BiasDramBlockWindowTmp,
+              typename LSEDramBlockWindowTmp>
+    CK_TILE_HOST_DEVICE auto
+    operator()(const QDramBlockWindowTmp& q_dram_block_window_tmp,       // M0*K0 tile
+               const KDramBlockWindowTmp& k_dram_block_window_tmp,       // N0*K0 tile
+               const VDramBlockWindowTmp& v_dram_block_window_tmp,       // N1*K1 tile
+               const BiasDramBlockWindowTmp& bias_dram_block_window_tmp, // M0*N0 tile
+               LSEDramBlockWindowTmp& /*lse_dram_window_tmp*/,           // not supported
+               FmhaMask mask,
+               float scale_s,
+               float descale_qk,
+               float descale_sv,
+               void* smem_ptr) const
+    {
+        static_assert(
+            std::is_same_v<QDataType, remove_cvref_t<typename QDramBlockWindowTmp::DataType>> &&
+                std::is_same_v<KDataType, remove_cvref_t<typename KDramBlockWindowTmp::DataType>> &&
+                std::is_same_v<VDataType, remove_cvref_t<typename VDramBlockWindowTmp::DataType>>,
+            "wrong!");
+
+        static_assert(kM0 == QDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kN0 == KDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kK0 == KDramBlockWindowTmp{}.get_window_lengths()[number<1>{}] &&
+                          kN1 == VDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kK1 == VDramBlockWindowTmp{}.get_window_lengths()[number<1>{}] &&
+                          kM0 == BiasDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kN0 == BiasDramBlockWindowTmp{}.get_window_lengths()[number<1>{}],
+                      "wrong!");
+
+        // K tile in LDS
+        KDataType* k_lds_ptr = static_cast<KDataType*>(static_cast<void*>(
+            static_cast<char*>(smem_ptr) + Policy::template GetSmemSizeQ<Problem>()));
+        auto k_lds           = make_tensor_view<address_space_enum::lds>(
+            k_lds_ptr, Policy::template MakeKLdsBlockDescriptor<Problem>());
+        auto k_lds_window =
+            make_tile_window(k_lds, make_tuple(number<kN0>{}, number<kK0>{}), {0, 0});
+
+        // V tile in LDS
+        auto v_lds = make_tensor_view<address_space_enum::lds>(
+            reinterpret_cast<VDataType*>(smem_ptr),
+            Policy::template MakeVLdsBlockDescriptor<Problem>());
+        auto v_lds_window = make_tile_window(
+            v_lds, Policy::template MakeVLdsBlockDescriptor<Problem>().get_lengths(), {0, 0});
+
+        // Block GEMM
+        constexpr auto gemm_0 = Policy::template GetQKBlockGemm<Problem>();
+        constexpr auto gemm_1 = Policy::template GetKVBlockGemm<Problem>();
+
+        auto q_dram_window = make_tile_window(
+            q_dram_block_window_tmp.get_bottom_tensor_view(),
+            q_dram_block_window_tmp.get_window_lengths(),
+            q_dram_block_window_tmp.get_window_origin(),
+            Policy::template MakeQDramTileDistribution<Problem, decltype(gemm_0)>());
+
+        auto q = load_tile(q_dram_window);
+
+        using SaccBlockTileType = decltype(gemm_0.MakeCBlockTile());
+        auto s_acc              = SaccBlockTileType{};
+
+        // reduction function for softmax
+        const auto f_max = [](auto e0, auto e1) { return max(e0, e1); };
+        const auto f_sum = [](auto e0, auto e1) { return e0 + e1; };
+
+        // infer Sacc, S, P, M, L, Oacc type
+        using SBlockTileType = decltype(cast_tile<SMPLComputeDataType>(s_acc));
+
+        using MLBlockTileType = decltype(block_tile_reduce<SMPLComputeDataType>(
+            SBlockTileType{}, sequence<1>{}, f_max, SMPLComputeDataType{0}));
+
+        using OaccBlockTileType = decltype(gemm_1.MakeCBlockTile());
+
+        // init Oacc, M, L
+        auto o_acc = OaccBlockTileType{};
+        auto m     = MLBlockTileType{};
+        auto l     = MLBlockTileType{};
+
+        clear_tile(o_acc);
+        set_tile(m, -numeric<SMPLComputeDataType>::infinity());
+        clear_tile(l);
+
+        const auto q_origin = q_dram_window.get_window_origin();
+        const auto [seqlen_k_start, seqlen_k_end] =
+            mask.GetTileRangeAlongX(q_origin.at(number<0>{}), number<kM0>{}, number<kN0>{});
+
+        const auto num_total_loop = integer_divide_ceil(seqlen_k_end - seqlen_k_start, kN0);
+
+        // check early exit if masked and no work to do.
+        if constexpr(FmhaMask::IsMasking)
+        {
+            if(num_total_loop <= 0)
+            {
+                // Note: here occ are all cleard, return it
+                // Note: q loaded but no fence, ignore it.
+                return o_acc;
+            }
+        }
+
+        auto k_dram_block_window =
+            make_tile_window(k_dram_block_window_tmp.get_bottom_tensor_view(),
+                             k_dram_block_window_tmp.get_window_lengths(),
+                             {seqlen_k_start, 0});
+
+        const auto bias_origin = bias_dram_block_window_tmp.get_window_origin();
+        auto bias_dram_window  = make_tile_window(
+            bias_dram_block_window_tmp.get_bottom_tensor_view(),
+            bias_dram_block_window_tmp.get_window_lengths(),
+            {bias_origin.at(number<0>{}), seqlen_k_start}, // M/N
+            Policy::template MakeBiasDramTileDistribution<Problem, decltype(gemm_0)>());
+
+        auto v_dram_window =
+            make_tile_window(v_dram_block_window_tmp.get_bottom_tensor_view(),
+                             v_dram_block_window_tmp.get_window_lengths(),
+                             {0, seqlen_k_start}, // TODO: hdim split?
+                             Policy::template MakeVDramTileDistribution<Problem>());
+
+        // auto q_tile = tile_elementwise_in(q_element_func, q);
+        auto q_tile = q;
+
+        // prefetch K tile
+        index_t i_total_loops      = 0;
+        constexpr index_t k0_loops = kK0BlockLength / kK0;
+        constexpr index_t k1_loops = kN0 / kK1;
+
+        static_assert(2 <= k0_loops);
+        static_assert(1 <= k1_loops);
+
+        scale_s = scale_s * descale_qk;
+        do
+        {
+            // STAGE 1, QK gemm
+            auto k_dram_window = make_tile_window(
+                k_dram_block_window.get_bottom_tensor_view(),
+                k_dram_block_window.get_window_lengths(),
+                k_dram_block_window.get_window_origin(),
+                Policy::template MakeKDramTileDistribution<Problem>()); // K DRAM tile window for
+                                                                        // load
+
+            auto k_block_tile = load_tile(k_dram_window);
+            {
+                move_tile_window(k_dram_window, {0, kK0});
+                clear_tile(s_acc); // initialize C
+                store_tile(k_lds_window, k_block_tile);
+                k_block_tile = load_tile(k_dram_window);
+            }
+
+            if constexpr(kHasBias)
+            {
+                __builtin_amdgcn_sched_barrier(
+                    0); // prevent from messing up the order of global loads
+            }
+            const auto bias_tile = load_tile(bias_dram_window); // load bias tile
+            if constexpr(kHasBias)
+            {
+                __builtin_amdgcn_sched_barrier(
+                    0); // prevent from messing up the order of global loads
+            }
+
+            if constexpr(k0_loops > 2)
+            {
+                static_for<0, k0_loops - 2, 1>{}([&](auto i_k0) {
+                    block_sync_lds();
+                    gemm_0(s_acc,
+                           get_slice_tile(q_tile,
+                                          sequence<0, i_k0 * kK0>{},
+                                          sequence<kM0, (i_k0 + 1) * kK0>{}),
+                           k_lds_window);
+                    block_sync_lds();
+                    move_tile_window(k_dram_window, {0, kK0});
+
+                    store_tile(k_lds_window,
+                               k_block_tile);                // LDS write i + 1
+                    k_block_tile = load_tile(k_dram_window); // global read i + 2
+                });
+            }
+
+            const auto v_prefetch = load_tile(v_dram_window); // prefetch load v tile
+            {                                                 // tail
+                block_sync_lds();
+                gemm_0(s_acc,
+                       get_slice_tile(q_tile,
+                                      sequence<0, (k0_loops - 2) * kK0>{},
+                                      sequence<kM0, (k0_loops - 1) * kK0>{}),
+                       k_lds_window);
+                block_sync_lds();
+
+                store_tile(k_lds_window, k_block_tile);
+                block_sync_lds();
+
+                gemm_0(s_acc,
+                       get_slice_tile(q_tile,
+                                      sequence<0, (k0_loops - 1) * kK0>{},
+                                      sequence<kM0, k0_loops * kK0>{}),
+                       k_lds_window);
+            }
+
+            // STAGE 2, scale_s, add bias, mask, softmax
+            if constexpr(kHasBias)
+            {
+                tile_elementwise_inout(
+                    [&](auto& x, const auto& y) {
+#if !CK_TILE_FMHA_FWD_FAST_EXP2
+                        x = scale_s * x + type_convert<SaccDataType>((y));
+#else
+                        x = scale_s * x + log2e_v<SaccDataType> * type_convert<SaccDataType>((y));
+#endif
+                    },
+                    s_acc,
+                    bias_tile);
+            }
+            else
+            {
+#if !CK_TILE_FMHA_FWD_FAST_EXP2
+                tile_elementwise_inout([&scale_s](auto& x) { x = x * scale_s; }, s_acc);
+#endif
+            }
+            move_tile_window(bias_dram_window, {0, kN0});
+            if constexpr(kPadSeqLenK || FmhaMask::IsMasking)
+            {
+                const auto k_origin      = k_dram_block_window.get_window_origin();
+                bool need_perpixel_check = mask.IsEdgeTile(q_origin.at(number<0>{}),
+                                                           k_origin.at(number<0>{}),
+                                                           number<kM0>{},
+                                                           number<kN0>{});
+                if(need_perpixel_check)
+                {
+                    set_tile_if(
+                        s_acc, -numeric<SMPLComputeDataType>::infinity(), [&](auto tile_idx) {
+                            const auto row = q_origin.at(number<0>{}) + tile_idx.at(number<0>{});
+                            const auto col = k_origin.at(number<0>{}) + tile_idx.at(number<1>{});
+                            return mask.IsOutOfBound(row, col);
+                        });
+                }
+            }
+
+            const auto s = cast_tile<SMPLComputeDataType>(s_acc); // S{j}
+            auto m_local = block_tile_reduce<SMPLComputeDataType>(
+                s,
+                sequence<1>{},
+                f_max,
+                -numeric<SMPLComputeDataType>::infinity()); // m_local = rowmax(S{j})
+            block_tile_reduce_sync(m_local, f_max, bool_constant<false>{});
+
+            const auto m_old = m; // m{j-1}
+            tile_elementwise_inout(
+                [](auto& e0, auto e1, auto e2) { e0 = max(e1, e2); }, m, m_old, m_local); // m{j}
+
+            auto p_compute = make_static_distributed_tensor<SMPLComputeDataType>(
+                s.get_tile_distribution()); // Pcompute{j}
+
+            static const auto get_validated_m = [](SMPLComputeDataType raw_m) {
+                /// NOTICE: bias might be materialized mask including -inf values, need
+                /// consideration
+                if constexpr(kHasBias || FmhaMask::IsMasking)
+                {
+                    return raw_m == -numeric<SMPLComputeDataType>::infinity()
+                               ? type_convert<SMPLComputeDataType>(0.f)
+                               : raw_m;
+                }
+                else
+                {
+                    return raw_m;
+                }
+            };
+
+            constexpr auto p_spans = decltype(p_compute)::get_distributed_spans();
+            sweep_tile_span(p_spans[number<0>{}], [&](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                auto row_max = scale_s * get_validated_m(m[i_idx]);
+#endif
+                sweep_tile_span(p_spans[number<1>{}], [&](auto idx1) {
+                    constexpr auto i_j_idx = make_tuple(idx0, idx1);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                    if constexpr(kHasBias)
+                    {
+                        p_compute(i_j_idx) = exp2(s[i_j_idx] - get_validated_m(m[i_idx]));
+                    }
+                    else
+                    {
+                        p_compute(i_j_idx) = exp2(scale_s * s[i_j_idx] - row_max);
+                    }
+#else
+                    p_compute(i_j_idx)     = exp(s[i_j_idx] - get_validated_m(m[i_idx]));
+#endif
+                });
+            });
+
+            auto rowsum_p = block_tile_reduce<SMPLComputeDataType>(
+                p_compute, sequence<1>{}, f_sum, SMPLComputeDataType{0}); // rowsum(Pcompute{j})
+
+            block_tile_reduce_sync(rowsum_p, f_sum, bool_constant<false>{});
+            // l{j}, Oacc{j}
+            constexpr auto o_spans = decltype(o_acc)::get_distributed_spans();
+            sweep_tile_span(o_spans[number<0>{}], [&](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                const auto tmp = [&]() {
+                    if constexpr(kHasBias)
+                    {
+                        return exp2(m_old[i_idx] - get_validated_m(m[i_idx]));
+                    }
+                    else
+                    {
+                        auto row_max = scale_s * get_validated_m(m[i_idx]);
+                        return exp2(scale_s * m_old[i_idx] - row_max);
+                    }
+                }();
+#else
+                const auto tmp       = exp(m_old[i_idx] - get_validated_m(m[i_idx]));
+#endif
+                l(i_idx) = tmp * l[i_idx] + rowsum_p[i_idx];
+                sweep_tile_span(o_spans[number<1>{}], [&](auto idx1) {
+                    constexpr auto i_j_idx = make_tuple(idx0, idx1);
+                    // FIXME: this use different equation from FA v2 paper,
+                    // but produce correc result.
+                    // Is the equation wrong?
+                    o_acc(i_j_idx) *= tmp;
+                });
+            });
+
+            block_sync_lds();
+            if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+            {
+                auto v_shuffle_tmp = make_static_distributed_tensor<VDataType>(
+                    Policy::template MakeShuffledVRegBlockDescriptor<Problem>());
+                shuffle_tile(v_shuffle_tmp, v_prefetch);
+                store_tile(v_lds_window,
+                           v_shuffle_tmp); // store the prefetch
+            }
+            else
+            {
+                store_tile(v_lds_window,
+                           v_prefetch); // store the prefetch
+            }
+            move_tile_window(v_dram_window, {0, kK1});
+
+            const auto p = cast_tile<PDataType>(p_compute);
+
+            // STAGE 3, KV gemm
+            if constexpr(k1_loops > 1)
+            {
+                static_for<0, k1_loops - 1, 1>{}([&](auto i_k1) {
+                    const auto v = load_tile(v_dram_window); // load next v
+                    block_sync_lds();
+                    gemm_1(o_acc,
+                           get_slice_tile(
+                               p, sequence<0, i_k1 * kK1>{}, sequence<kM0, (i_k1 + 1) * kK1>{}),
+                           v_lds_window);
+                    block_sync_lds();
+                    if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+                    {
+                        auto v_shuffle_tmp = make_static_distributed_tensor<VDataType>(
+                            Policy::template MakeShuffledVRegBlockDescriptor<Problem>());
+                        shuffle_tile(v_shuffle_tmp, v);
+                        store_tile(v_lds_window, v_shuffle_tmp);
+                    }
+                    else
+                    {
+                        store_tile(v_lds_window, v);
+                    }
+                    move_tile_window(v_dram_window, {0, kK1});
+                });
+            }
+            // move K tile windows
+            move_tile_window(k_dram_block_window, {kN0, 0});
+            // tail
+            {
+                block_sync_lds();
+                gemm_1(o_acc,
+                       get_slice_tile(p, sequence<0, (k1_loops - 1) * kK1>{}, sequence<kM0, kN0>{}),
+                       v_lds_window);
+                block_sync_lds();
+            }
+        } while(++i_total_loops < num_total_loop);
+
+        // finally, O
+        constexpr auto o_spans = decltype(o_acc)::get_distributed_spans();
+
+        sweep_tile_span(o_spans[number<0>{}], [&](auto idx0) {
+            constexpr auto i_idx = make_tuple(idx0);
+            auto tmp             = [&]() {
+                if constexpr(FmhaMask::IsMasking)
+                {
+                    return l[i_idx] == 0.f ? 0.f : 1 / l[i_idx];
+                }
+                else
+                    return 1 / l[i_idx];
+            }();
+            tmp = tmp * descale_sv;
+            sweep_tile_span(o_spans[number<1>{}], [&](auto idx1) {
+                constexpr auto i_j_idx = make_tuple(idx0, idx1);
+                o_acc(i_j_idx) *= tmp;
+            });
+        });
+
+        return o_acc;
+    }
+};
+
+} // namespace ck_tile

include/ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qs_ks_vs.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qs_ks_vs_default_policy.hpp"
+
+namespace ck_tile {
+
+// This pipeline is qkv all located in LDS
+template <typename Problem_, typename Policy_ = BlockFmhaPipelineQSKSVSDefaultPolicy>
+struct BlockFmhaPipelineQSKSVS
+{
+    using Problem             = remove_cvref_t<Problem_>;
+    using Policy              = remove_cvref_t<Policy_>;
+    using QDataType           = remove_cvref_t<typename Problem::QDataType>;
+    using KDataType           = remove_cvref_t<typename Problem::KDataType>;
+    using VDataType           = remove_cvref_t<typename Problem::VDataType>;
+    using SaccDataType        = remove_cvref_t<typename Problem::SaccDataType>;
+    using SMPLComputeDataType = remove_cvref_t<typename Problem::SMPLComputeDataType>;
+    using BiasDataType        = remove_cvref_t<typename Problem::BiasDataType>;
+    using LSEDataType         = remove_cvref_t<typename Problem::LSEDataType>;
+    using PDataType           = remove_cvref_t<typename Problem::PDataType>;
+    using OaccDataType        = remove_cvref_t<typename Problem::OaccDataType>;
+    using ODataType           = remove_cvref_t<typename Problem::ODataType>;
+    using FmhaMask            = remove_cvref_t<typename Problem::FmhaMask>;
+
+    using BlockFmhaShape             = remove_cvref_t<typename Problem::BlockFmhaShape>;
+    using VLayout                    = remove_cvref_t<typename BlockFmhaShape::VLayout>;
+    static constexpr bool kQLoadOnce = false;
+    static_assert(kQLoadOnce == Policy::QLoadOnce);
+    static constexpr bool kIsFp8 = Problem::kIsFp8;
+
+    static constexpr index_t kBlockSize = Problem::kBlockSize;
+
+    static constexpr index_t kM0            = BlockFmhaShape::kM0;
+    static constexpr index_t kN0            = BlockFmhaShape::kN0;
+    static constexpr index_t kK0            = BlockFmhaShape::kK0;
+    static constexpr index_t kN1            = BlockFmhaShape::kN1;
+    static constexpr index_t kK1            = BlockFmhaShape::kK1;
+    static constexpr index_t kK0BlockLength = BlockFmhaShape::kK0BlockLength;
+
+    static constexpr bool kIsGroupMode = Problem::kIsGroupMode;
+    static constexpr bool kPadSeqLenQ  = Problem::kPadSeqLenQ;
+    static constexpr bool kPadSeqLenK  = Problem::kPadSeqLenK;
+    static constexpr bool kPadHeadDimQ = Problem::kPadHeadDimQ;
+    static constexpr bool kPadHeadDimV = Problem::kPadHeadDimV;
+    static constexpr bool kHasBias     = Problem::kHasBias;
+    static constexpr bool kStoreLSE    = Problem::kStoreLSE;
+
+    static constexpr index_t kBlockPerCu = []() {
+        if constexpr(Problem::kBlockPerCu != -1)
+            return Problem::kBlockPerCu;
+        else
+        {
+            if constexpr(kK0BlockLength <= 32)
+            {
+                return 2;
+            }
+            else if constexpr(kK0BlockLength <= 64)
+            {
+                return 3;
+            }
+            else if constexpr(kK0BlockLength <= 128)
+            {
+                if constexpr(kHasBias)
+                    return 1;
+                else
+                    return 2;
+            }
+            else if constexpr(kK0BlockLength <= 256)
+            {
+                return 1;
+            }
+        }
+    }();
+
+    static constexpr const char* name = "qs";
+
+    CK_TILE_HOST_DEVICE static constexpr ck_tile::index_t GetSmemSize()
+    {
+        return Policy::template GetSmemSize<Problem>();
+    }
+
+    CK_TILE_HOST_DEVICE static constexpr ck_tile::index_t GetSmemSizeQ()
+    {
+        return Policy::template GetSmemSizeQ<Problem>();
+    }
+
+    template <typename QDramBlockWindowTmp,
+              typename KDramBlockWindowTmp,
+              typename VDramBlockWindowTmp,
+              typename BiasDramBlockWindowTmp,
+              typename LSEDramBlockWindowTmp,
+              typename QElementFunction,
+              typename KElementFunction,
+              typename VElementFunction,
+              typename BiasElementFunction,
+              typename LSEElementFunction,
+              typename SAccElementFunction,
+              typename PComputeElementFunction,
+              typename OAccElementFunction>
+    CK_TILE_HOST_DEVICE auto
+    operator()(const QDramBlockWindowTmp& q_dram_block_window_tmp, // M0*K0 tile
+               const QElementFunction& q_element_func,
+               const KDramBlockWindowTmp& k_dram_block_window_tmp, // N0*K0 tile
+               const KElementFunction& k_element_func,
+               const VDramBlockWindowTmp& v_dram_block_window_tmp, // N1*K1 tile
+               const VElementFunction& v_element_func,
+               const BiasDramBlockWindowTmp& bias_dram_block_window_tmp, // M0*N0 tile
+               const BiasElementFunction& bias_element_func,
+               LSEDramBlockWindowTmp& lse_dram_window_tmp, // M0*1 tile
+               const LSEElementFunction& lse_element_func,
+               const SAccElementFunction& s_acc_element_func,
+               const PComputeElementFunction& p_compute_element_func,
+               const OAccElementFunction& o_acc_element_func,
+               FmhaMask mask,
+               float scale_s,
+               void* smem_ptr) const
+    {
+        static_assert(
+            std::is_same_v<QDataType, remove_cvref_t<typename QDramBlockWindowTmp::DataType>> &&
+                std::is_same_v<KDataType, remove_cvref_t<typename KDramBlockWindowTmp::DataType>> &&
+                std::is_same_v<VDataType, remove_cvref_t<typename VDramBlockWindowTmp::DataType>>,
+            "wrong!");
+
+        static_assert(kM0 == QDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kN0 == KDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kK0 == KDramBlockWindowTmp{}.get_window_lengths()[number<1>{}] &&
+                          kN1 == VDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kK1 == VDramBlockWindowTmp{}.get_window_lengths()[number<1>{}] &&
+                          kM0 == BiasDramBlockWindowTmp{}.get_window_lengths()[number<0>{}] &&
+                          kN0 == BiasDramBlockWindowTmp{}.get_window_lengths()[number<1>{}],
+                      "wrong!");
+
+        // Q tile in LDS
+        auto q_lds = make_tensor_view<address_space_enum::lds>(
+            reinterpret_cast<QDataType*>(smem_ptr),
+            Policy::template MakeQLdsBlockDescriptor<Problem>());
+        auto q_lds_window =
+            make_tile_window(q_lds, make_tuple(number<kM0>{}, number<kK0>{}), {0, 0});
+
+        // K tile in LDS
+        KDataType* k_lds_ptr = static_cast<KDataType*>(static_cast<void*>(
+            static_cast<char*>(smem_ptr) + Policy::template GetSmemSizeQ<Problem>()));
+        auto k_lds           = make_tensor_view<address_space_enum::lds>(
+            k_lds_ptr, Policy::template MakeKLdsBlockDescriptor<Problem>());
+        auto k_lds_window =
+            make_tile_window(k_lds, make_tuple(number<kN0>{}, number<kK0>{}), {0, 0});
+
+        // V tile in LDS
+        auto v_lds = make_tensor_view<address_space_enum::lds>(
+            reinterpret_cast<VDataType*>(smem_ptr),
+            Policy::template MakeVLdsBlockDescriptor<Problem>());
+        auto v_lds_window = make_tile_window(
+            v_lds, Policy::template MakeVLdsBlockDescriptor<Problem>().get_lengths(), {0, 0});
+
+        // Block GEMM
+        constexpr auto gemm_0 = Policy::template GetQKBlockGemm<Problem>();
+        constexpr auto gemm_1 = Policy::template GetKVBlockGemm<Problem>();
+
+        using SaccBlockTileType = decltype(gemm_0.MakeCBlockTile());
+        auto s_acc              = SaccBlockTileType{};
+
+        // reduction function for softmax
+        const auto f_max = [](auto e0, auto e1) { return max(e0, e1); };
+        const auto f_sum = [](auto e0, auto e1) { return e0 + e1; };
+
+        // infer Sacc, S, P, M, L, Oacc type
+        using SBlockTileType = decltype(cast_tile<SMPLComputeDataType>(s_acc));
+
+        using MLBlockTileType = decltype(block_tile_reduce<SMPLComputeDataType>(
+            SBlockTileType{}, sequence<1>{}, f_max, SMPLComputeDataType{0}));
+
+        using OaccBlockTileType = decltype(gemm_1.MakeCBlockTile());
+
+        // init Oacc, M, L
+        auto o_acc = OaccBlockTileType{};
+        auto m     = MLBlockTileType{};
+        auto l     = MLBlockTileType{};
+
+        clear_tile(o_acc);
+        set_tile(m, -numeric<SMPLComputeDataType>::infinity());
+        clear_tile(l);
+
+        const auto q_origin = q_dram_block_window_tmp.get_window_origin();
+        const auto [seqlen_k_start, seqlen_k_end] =
+            mask.GetTileRangeAlongX(q_origin.at(number<0>{}), number<kM0>{}, number<kN0>{});
+
+        const auto num_total_loop = integer_divide_ceil(seqlen_k_end - seqlen_k_start, kN0);
+
+        // check early exit if masked and no work to do.
+        if constexpr(FmhaMask::IsMasking)
+        {
+            if(num_total_loop <= 0)
+            {
+                if constexpr(kStoreLSE)
+                {
+                    auto lse =
+                        make_static_distributed_tensor<LSEDataType>(m.get_tile_distribution());
+
+                    set_tile(lse, -numeric<SMPLComputeDataType>::infinity());
+
+                    store_tile(lse_dram_window_tmp, tile_elementwise_in(lse_element_func, lse));
+                }
+
+                // Note: here occ are all cleard, return it
+                // Note: q loaded but no fence, ignore it.
+                return o_acc;
+            }
+        }
+
+        auto k_dram_block_window =
+            make_tile_window(k_dram_block_window_tmp.get_bottom_tensor_view(),
+                             k_dram_block_window_tmp.get_window_lengths(),
+                             {seqlen_k_start, 0});
+
+        const auto bias_origin = bias_dram_block_window_tmp.get_window_origin();
+        auto bias_dram_window  = make_tile_window(
+            bias_dram_block_window_tmp.get_bottom_tensor_view(),
+            bias_dram_block_window_tmp.get_window_lengths(),
+            {bias_origin.at(number<0>{}), seqlen_k_start}, // M/N
+            Policy::template MakeBiasDramTileDistribution<Problem, decltype(gemm_0)>());
+
+        auto v_dram_window =
+            make_tile_window(v_dram_block_window_tmp.get_bottom_tensor_view(),
+                             v_dram_block_window_tmp.get_window_lengths(),
+                             {0, seqlen_k_start}, // TODO: hdim split?
+                             Policy::template MakeVDramTileDistribution<Problem>());
+
+        // prefetch K tile
+        index_t i_total_loops      = 0;
+        constexpr index_t k0_loops = kK0BlockLength / kK0;
+        constexpr index_t k1_loops = kN0 / kK1;
+
+        static_assert(2 <= k0_loops);
+        static_assert(1 <= k1_loops);
+        do
+        {
+            // STAGE 1, QK gemm
+            auto q_dram_window =
+                make_tile_window(q_dram_block_window_tmp.get_bottom_tensor_view(),
+                                 q_dram_block_window_tmp.get_window_lengths(),
+                                 q_dram_block_window_tmp.get_window_origin(),
+                                 Policy::template MakeQDramTileDistribution<Problem>());
+
+            auto k_dram_window =
+                make_tile_window(k_dram_block_window.get_bottom_tensor_view(),
+                                 k_dram_block_window.get_window_lengths(),
+                                 k_dram_block_window.get_window_origin(),
+                                 Policy::template MakeKDramTileDistribution<Problem>());
+
+            auto q_block_tile = load_tile(q_dram_window);
+            auto k_block_tile = load_tile(k_dram_window);
+            {
+                move_tile_window(q_dram_window, {0, kK0});
+                move_tile_window(k_dram_window, {0, kK0});
+
+                clear_tile(s_acc); // initialize C
+
+                store_tile(q_lds_window, tile_elementwise_in(q_element_func, q_block_tile));
+                q_block_tile = load_tile(q_dram_window);
+
+                store_tile(k_lds_window, tile_elementwise_in(k_element_func, k_block_tile));
+                k_block_tile = load_tile(k_dram_window);
+            }
+
+            if constexpr(kHasBias)
+            {
+                __builtin_amdgcn_sched_barrier(
+                    0); // prevent from messing up the order of global loads
+            }
+            const auto bias_tile = load_tile(bias_dram_window); // load bias tile
+            if constexpr(kHasBias)
+            {
+                __builtin_amdgcn_sched_barrier(
+                    0); // prevent from messing up the order of global loads
+            }
+
+            if constexpr(k0_loops > 2)
+            {
+                static_for<0, k0_loops - 2, 1>{}([&](auto) {
+                    block_sync_lds();
+                    gemm_0(s_acc, q_lds_window, k_lds_window);
+                    block_sync_lds();
+
+                    move_tile_window(q_dram_window, {0, kK0});
+                    move_tile_window(k_dram_window, {0, kK0});
+
+                    store_tile(
+                        q_lds_window,
+                        tile_elementwise_in(q_element_func, q_block_tile)); // LDS write i + 1
+                    q_block_tile = load_tile(q_dram_window);                // global read i + 2
+
+                    store_tile(
+                        k_lds_window,
+                        tile_elementwise_in(k_element_func, k_block_tile)); // LDS write i + 1
+                    k_block_tile = load_tile(k_dram_window);                // global read i + 2
+                });
+            }
+
+            const auto v_prefetch = load_tile(v_dram_window); // prefetch load v tile
+            {                                                 // tail
+                block_sync_lds();
+                gemm_0(s_acc, q_lds_window, k_lds_window);
+                block_sync_lds();
+
+                store_tile(q_lds_window, tile_elementwise_in(q_element_func, q_block_tile));
+                store_tile(k_lds_window, tile_elementwise_in(k_element_func, k_block_tile));
+                block_sync_lds();
+
+                gemm_0(s_acc, q_lds_window, k_lds_window);
+            }
+
+            // STAGE 2, scale_s, add bias, mask, softmax
+            if constexpr(kHasBias)
+            {
+                s_acc = tile_elementwise_in(s_acc_element_func, s_acc);
+                tile_elementwise_inout([&scale_s](auto& x) { x = x * scale_s; }, s_acc);
+                tile_elementwise_inout(
+                    [&](auto& x, const auto& y) {
+#if !CK_TILE_FMHA_FWD_FAST_EXP2
+                        x += type_convert<SaccDataType>(bias_element_func(y));
+#else
+                        x += log2e_v<SaccDataType> *
+                             type_convert<SaccDataType>(bias_element_func(y));
+#endif
+                    },
+                    s_acc,
+                    bias_tile);
+            }
+            else
+            {
+                s_acc = tile_elementwise_in(s_acc_element_func, s_acc);
+#if !CK_TILE_FMHA_FWD_FAST_EXP2
+                tile_elementwise_inout([&scale_s](auto& x) { x = x * scale_s; }, s_acc);
+#endif
+            }
+            move_tile_window(bias_dram_window, {0, kN0});
+            if constexpr(kPadSeqLenK || FmhaMask::IsMasking)
+            {
+                const auto k_origin      = k_dram_block_window.get_window_origin();
+                bool need_perpixel_check = mask.IsEdgeTile(q_origin.at(number<0>{}),
+                                                           k_origin.at(number<0>{}),
+                                                           number<kM0>{},
+                                                           number<kN0>{});
+                if(need_perpixel_check)
+                {
+                    set_tile_if(
+                        s_acc, -numeric<SMPLComputeDataType>::infinity(), [&](auto tile_idx) {
+                            const auto row = q_origin.at(number<0>{}) + tile_idx.at(number<0>{});
+                            const auto col = k_origin.at(number<0>{}) + tile_idx.at(number<1>{});
+                            return mask.IsOutOfBound(row, col);
+                        });
+                }
+            }
+
+            const auto s = cast_tile<SMPLComputeDataType>(s_acc); // S{j}
+            auto m_local = block_tile_reduce<SMPLComputeDataType>(
+                s,
+                sequence<1>{},
+                f_max,
+                -numeric<SMPLComputeDataType>::infinity()); // m_local = rowmax(S{j})
+            block_tile_reduce_sync(m_local, f_max, bool_constant<false>{});
+
+            const auto m_old = m; // m{j-1}
+            tile_elementwise_inout(
+                [](auto& e0, auto e1, auto e2) { e0 = max(e1, e2); }, m, m_old, m_local); // m{j}
+
+            auto p_compute = make_static_distributed_tensor<SMPLComputeDataType>(
+                s.get_tile_distribution()); // Pcompute{j}
+
+            static const auto get_validated_m = [](SMPLComputeDataType raw_m) {
+                /// NOTICE: bias might be materialized mask including -inf values, need
+                /// consideration
+                if constexpr(kHasBias || FmhaMask::IsMasking)
+                {
+                    return raw_m == -numeric<SMPLComputeDataType>::infinity()
+                               ? type_convert<SMPLComputeDataType>(0.f)
+                               : raw_m;
+                }
+                else
+                {
+                    return raw_m;
+                }
+            };
+
+            constexpr auto p_spans = decltype(p_compute)::get_distributed_spans();
+            sweep_tile_span(p_spans[number<0>{}], [&](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                auto row_max = scale_s * get_validated_m(m[i_idx]);
+#endif
+                sweep_tile_span(p_spans[number<1>{}], [&](auto idx1) {
+                    constexpr auto i_j_idx = make_tuple(idx0, idx1);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                    if constexpr(kHasBias)
+                    {
+                        p_compute(i_j_idx) = exp2(s[i_j_idx] - get_validated_m(m[i_idx]));
+                    }
+                    else
+                    {
+                        p_compute(i_j_idx) = exp2(scale_s * s[i_j_idx] - row_max);
+                    }
+#else
+                    p_compute(i_j_idx)     = exp(s[i_j_idx] - get_validated_m(m[i_idx]));
+#endif
+                });
+            });
+
+            auto rowsum_p = block_tile_reduce<SMPLComputeDataType>(
+                p_compute, sequence<1>{}, f_sum, SMPLComputeDataType{0}); // rowsum(Pcompute{j})
+
+            block_tile_reduce_sync(rowsum_p, f_sum, bool_constant<false>{});
+            // l{j}, Oacc{j}
+            constexpr auto o_spans = decltype(o_acc)::get_distributed_spans();
+            sweep_tile_span(o_spans[number<0>{}], [&](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                const auto tmp = [&]() {
+                    if constexpr(kHasBias)
+                    {
+                        return exp2(m_old[i_idx] - get_validated_m(m[i_idx]));
+                    }
+                    else
+                    {
+                        auto row_max = scale_s * get_validated_m(m[i_idx]);
+                        return exp2(scale_s * m_old[i_idx] - row_max);
+                    }
+                }();
+#else
+                const auto tmp       = exp(m_old[i_idx] - get_validated_m(m[i_idx]));
+#endif
+                l(i_idx) = tmp * l[i_idx] + rowsum_p[i_idx];
+                sweep_tile_span(o_spans[number<1>{}], [&](auto idx1) {
+                    constexpr auto i_j_idx = make_tuple(idx0, idx1);
+                    // FIXME: this use different equation from FA v2 paper,
+                    // but produce correc result.
+                    // Is the equation wrong?
+                    o_acc(i_j_idx) *= tmp;
+                });
+            });
+
+            block_sync_lds();
+            if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+            {
+                auto v_shuffle_tmp = make_static_distributed_tensor<VDataType>(
+                    Policy::template MakeShuffledVRegBlockDescriptor<Problem>());
+                shuffle_tile(v_shuffle_tmp, v_prefetch);
+                store_tile(
+                    v_lds_window,
+                    tile_elementwise_in(v_element_func, v_shuffle_tmp)); // store the prefetch
+            }
+            else
+            {
+                store_tile(v_lds_window,
+                           tile_elementwise_in(v_element_func, v_prefetch)); // store the prefetch
+            }
+            move_tile_window(v_dram_window, {0, kK1});
+
+            const auto p =
+                cast_tile<PDataType>(tile_elementwise_in(p_compute_element_func, p_compute));
+
+            // STAGE 3, KV gemm
+            if constexpr(k1_loops > 1)
+            {
+                static_for<0, k1_loops - 1, 1>{}([&](auto i_k1) {
+                    const auto v = load_tile(v_dram_window); // load next v
+                    block_sync_lds();
+                    gemm_1(o_acc,
+                           get_slice_tile(
+                               p, sequence<0, i_k1 * kK1>{}, sequence<kM0, (i_k1 + 1) * kK1>{}),
+                           v_lds_window);
+                    block_sync_lds();
+                    if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+                    {
+                        auto v_shuffle_tmp = make_static_distributed_tensor<VDataType>(
+                            Policy::template MakeShuffledVRegBlockDescriptor<Problem>());
+                        shuffle_tile(v_shuffle_tmp, v);
+                        store_tile(v_lds_window,
+                                   tile_elementwise_in(v_element_func,
+                                                       v_shuffle_tmp)); // store the prefetch
+                    }
+                    else
+                    {
+                        store_tile(v_lds_window,
+                                   tile_elementwise_in(v_element_func, v)); // store next v
+                    }
+                    move_tile_window(v_dram_window, {0, kK1});
+                });
+            }
+            // move K tile windows
+            move_tile_window(k_dram_block_window, {kN0, 0});
+            // tail
+            {
+                block_sync_lds();
+                gemm_1(o_acc,
+                       get_slice_tile(p, sequence<0, (k1_loops - 1) * kK1>{}, sequence<kM0, kN0>{}),
+                       v_lds_window);
+                block_sync_lds();
+            }
+        } while(++i_total_loops < num_total_loop);
+
+        // store lse
+        if constexpr(kStoreLSE)
+        {
+            auto lse = make_static_distributed_tensor<LSEDataType>(m.get_tile_distribution());
+
+            constexpr auto lse_spans = decltype(lse)::get_distributed_spans();
+            sweep_tile_span(lse_spans[number<0>{}], [&, m_ = m, l_ = l](auto idx0) {
+                constexpr auto i_idx = make_tuple(idx0);
+#if CK_TILE_FMHA_FWD_FAST_EXP2
+                if constexpr(kHasBias)
+                {
+                    lse(i_idx) = m_[i_idx] / C_LOG2E + log(l_[i_idx]);
+                }
+                else
+                {
+                    lse(i_idx) = m_[i_idx] * scale_s / C_LOG2E + log(l_[i_idx]);
+                }
+#else
+                lse(i_idx) = m_[i_idx] + log(l_[i_idx]);
+#endif
+            });
+
+            store_tile(lse_dram_window_tmp, tile_elementwise_in(lse_element_func, lse));
+        }
+
+        // finally, O
+        constexpr auto o_spans = decltype(o_acc)::get_distributed_spans();
+
+        sweep_tile_span(o_spans[number<0>{}], [&](auto idx0) {
+            constexpr auto i_idx = make_tuple(idx0);
+            const auto tmp       = [&]() {
+                if constexpr(FmhaMask::IsMasking)
+                {
+                    return l[i_idx] == 0.f ? 0.f : 1 / l[i_idx];
+                }
+                else
+                    return 1 / l[i_idx];
+            }();
+            sweep_tile_span(o_spans[number<1>{}], [&](auto idx1) {
+                constexpr auto i_j_idx = make_tuple(idx0, idx1);
+                o_acc(i_j_idx) *= tmp;
+            });
+        });
+
+        o_acc = tile_elementwise_in(o_acc_element_func, o_acc);
+
+        return o_acc;
+    }
+
+    template <typename QDramBlockWindowTmp,
+              typename KDramBlockWindowTmp,
+              typename VDramBlockWindowTmp,
+              typename BiasDramBlockWindowTmp,
+              typename LSEDramBlockWindowTmp>
+    CK_TILE_HOST_DEVICE auto
+    operator()(const QDramBlockWindowTmp& q_dram_block_window_tmp,       // M0*K0 tile
+               const KDramBlockWindowTmp& k_dram_block_window_tmp,       // N0*K0 tile
+               const VDramBlockWindowTmp& v_dram_block_window_tmp,       // N1*K1 tile
+               const BiasDramBlockWindowTmp& bias_dram_block_window_tmp, // M0*N0 tile
+               LSEDramBlockWindowTmp& lse_dram_block_window_tmp,         // M0*1 tile
+               FmhaMask mask,
+               float scale_s,
+               void* smem_ptr) const
+    {
+        return operator()(q_dram_block_window_tmp,
+                          identity{},
+                          k_dram_block_window_tmp,
+                          identity{},
+                          v_dram_block_window_tmp,
+                          identity{},
+                          bias_dram_block_window_tmp,
+                          identity{},
+                          lse_dram_block_window_tmp,
+                          identity{},
+                          identity{},
+                          identity{},
+                          identity{},
+                          mask,
+                          scale_s,
+                          smem_ptr);
+    }
+};
+
+} // namespace ck_tile

include/ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qs_ks_vs_default_policy.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qx_ks_vs_custom_policy.hpp"
+
+namespace ck_tile {
+
+// This pipeline is qkv all located in LDS
+using BlockFmhaPipelineQSKSVSDefaultPolicy =
+    BlockFmhaPipelineQXKSVSCustomPolicy</* QLoadOnce = */ false,
+                                        /* AsyncCopyK = */ false,
+                                        /* AsyncCopyV = */ false,
+                                        /* NumPrefetchK = */ 1,
+                                        /* NumPrefetchV = */ 1>;
+
+} // namespace ck_tile

include/ck_tile/ops/fmha/pipeline/block_fmha_pipeline_qx_ks_vs_custom_policy.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/common/tensor_layout.hpp"
+#include "ck_tile/ops/gemm/pipeline/block_gemm_pipeline_problem.hpp"
+#include "ck_tile/ops/gemm/pipeline/tile_gemm_shape.hpp"
+#include "ck_tile/ops/gemm/warp/warp_gemm.hpp"
+#include "ck_tile/ops/gemm/warp/warp_gemm_dispatcher.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_asmem_bsmem_creg_v1_custom_policy.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_asmem_bsmem_creg_v1.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v1_custom_policy.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v2_custom_policy.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v2.hpp"
+
+// TODO: remove this
+#define K_LDS_LOAD_USE_OFFSET_TRANSFORM 0
+
+namespace ck_tile {
+
+template <bool QLoadOnce_>
+struct BlockFmhaPipelineQXCustomPolicy;
+
+template <>
+struct BlockFmhaPipelineQXCustomPolicy</* QLoadOnce = */ true>
+{
+    static constexpr bool QLoadOnce = true;
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr ck_tile::index_t GetSmemSizeQ()
+    {
+        return 0;
+    }
+
+    // TODO: GetAlignment*() currently didn't consider if need padding or not
+    //       so in pipeline still need check padding requirement
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetAlignmentQ()
+    {
+        using BlockGemm       = remove_cvref_t<decltype(GetQKBlockGemm<Problem>())>;
+        constexpr auto config = BlockGemm::Policy::template GetWarpGemmMWarpNWarp<Problem>();
+        using WG              = remove_cvref_t<decltype(config.template at<0>())>;
+        return WG::kK / WG::WarpGemmAttribute::Impl::kABKLane;
+    }
+
+    template <typename Problem, typename BlockGemm>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeQDramTileDistribution()
+    {
+        constexpr auto config   = BlockGemm::Policy::template GetWarpGemmMWarpNWarp<Problem>();
+        using WG                = remove_cvref_t<decltype(config.template at<0>())>;
+        constexpr index_t MWarp = config.template at<1>();
+
+        constexpr index_t kMPerBlock = Problem::BlockFmhaShape::kM0;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK0BlockLength;
+
+        constexpr index_t K2 = WG::kK / WG::WarpGemmAttribute::Impl::kABKLane;
+        constexpr index_t K1 = WG::WarpGemmAttribute::Impl::kABKLane;
+        constexpr index_t K0 = kKPerBlock / (K1 * K2);
+
+        constexpr index_t M2 = WG::WarpGemmAttribute::Impl::kAMLane;
+        constexpr index_t M1 = MWarp;
+        constexpr index_t M0 = kMPerBlock / (M2 * M1);
+
+        return make_static_tile_distribution(
+            tile_distribution_encoding<sequence<1>,
+                                       tuple<sequence<M0, M1, M2>, sequence<K0, K1, K2>>,
+                                       tuple<sequence<1>, sequence<2, 1>>,
+                                       tuple<sequence<1>, sequence<1, 2>>,
+                                       sequence<1, 2, 2>,
+                                       sequence<0, 0, 2>>{});
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetQKBlockGemm()
+    {
+        using BlockGemmProblem =
+            BlockGemmPipelineProblem<typename Problem::QDataType,
+                                     typename Problem::KDataType,
+                                     typename Problem::SaccDataType,
+                                     Problem::kBlockSize,
+                                     TileGemmShape<Problem::BlockFmhaShape::kM0,
+                                                   Problem::BlockFmhaShape::kN0,
+                                                   Problem::BlockFmhaShape::kK0>>;
+
+        constexpr auto warp_gemm = []() {
+            if constexpr(std::is_same_v<typename Problem::QDataType, half_t> &&
+                         std::is_same_v<typename Problem::KDataType, half_t> &&
+                         std::is_same_v<typename Problem::SaccDataType, float>)
+            {
+                return WarpGemmMfmaF16F16F32M16N16K32SwizzleBTransposedCDistribution{};
+            }
+            else if constexpr(std::is_same_v<typename Problem::QDataType, bf16_t> &&
+                              std::is_same_v<typename Problem::KDataType, bf16_t> &&
+                              std::is_same_v<typename Problem::SaccDataType, float>)
+            {
+                return WarpGemmMfmaBf16Bf16F32M16N16K32SwizzleBTransposedCDistribution{};
+            }
+            else if constexpr(Problem::kIsFp8)
+            {
+                constexpr index_t swizzle_factor = 4; // TODO: hard coded here
+                return WarpGemmImpl<
+                    WarpGemmAtrributeMfmaIterateKAndTransposedCDistribution_SwizzleB<
+                        WarpGemmAttributeMfmaImpl_f32_32x32x16_f8_base<typename Problem::QDataType,
+                                                                       typename Problem::KDataType>,
+                        2,
+                        swizzle_factor>>{};
+            }
+        }();
+
+        using BlockGemmPolicy =
+            BlockGemmARegBSmemCRegV2CustomPolicy<typename Problem::QDataType,
+                                                 typename Problem::KDataType,
+                                                 typename Problem::SaccDataType,
+                                                 typename Problem::BlockFmhaShape::Gemm0BlockWarps,
+                                                 decltype(warp_gemm)>;
+
+        return BlockGemmARegBSmemCRegV2<BlockGemmProblem, BlockGemmPolicy>{};
+    }
+};
+
+template <>
+struct BlockFmhaPipelineQXCustomPolicy</* QLoadOnce = */ false>
+{
+    static constexpr bool QLoadOnce = false;
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr ck_tile::index_t GetSmemSizeQ()
+    {
+        constexpr index_t lds_alignment = 16; // optional
+        constexpr index_t q_smem_size =
+            ck_tile::integer_divide_ceil(
+                sizeof(typename Problem::QDataType) *
+                    MakeQLdsBlockDescriptor<Problem>().get_element_space_size(),
+                lds_alignment) *
+            lds_alignment;
+        return q_smem_size;
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetAlignmentQ()
+    {
+        using QDataType = remove_cvref_t<typename Problem::QDataType>;
+        return 16 / sizeof(QDataType);
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeQDramTileDistribution()
+    {
+        using QDataType = remove_cvref_t<typename Problem::QDataType>;
+
+        constexpr index_t kBlockSize = Problem::kBlockSize;
+
+        constexpr index_t kMPerBlock = Problem::BlockFmhaShape::kM0;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK0;
+
+        constexpr index_t K1 = 16 / sizeof(QDataType); // use dwordx4. TODO: change this
+        constexpr index_t K0 = kKPerBlock / K1;
+        constexpr index_t M2 = get_warp_size() / K0;
+        constexpr index_t M1 = kBlockSize / get_warp_size();
+        constexpr index_t M0 = kMPerBlock / (M2 * M1);
+
+        return make_static_tile_distribution(
+            tile_distribution_encoding<sequence<1>,
+                                       tuple<sequence<M0, M1, M2>, sequence<K0, K1>>,
+                                       tuple<sequence<1>, sequence<1, 2>>,
+                                       tuple<sequence<1>, sequence<2, 0>>,
+                                       sequence<1, 2>,
+                                       sequence<0, 1>>{});
+    }
+
+    // 3d + padding
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeQLdsBlockDescriptor()
+    {
+        using QDataType = remove_cvref_t<typename Problem::QDataType>;
+
+        constexpr index_t kMPerBlock = Problem::BlockFmhaShape::kM0;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK0;
+        constexpr index_t kKPack     = 16 / sizeof(QDataType);
+
+        constexpr auto q_lds_block_desc_0 = make_naive_tensor_descriptor(
+            make_tuple(number<kKPerBlock / kKPack>{}, number<kMPerBlock>{}, number<kKPack>{}),
+            make_tuple(number<(kMPerBlock + 1) * kKPack>{}, number<kKPack>{}, number<1>{}),
+            number<8>{},
+            number<1>{});
+
+        constexpr auto q_lds_block_desc = transform_tensor_descriptor(
+            q_lds_block_desc_0,
+            make_tuple(make_pass_through_transform(kMPerBlock),
+                       make_merge_transform(make_tuple(kKPerBlock / kKPack, kKPack))),
+            make_tuple(sequence<1>{}, sequence<0, 2>{}),
+            make_tuple(sequence<0>{}, sequence<1>{}));
+
+        return q_lds_block_desc;
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetQKBlockGemm()
+    {
+        using BlockGemmProblem =
+            BlockGemmPipelineProblem<typename Problem::QDataType,
+                                     typename Problem::KDataType,
+                                     typename Problem::SaccDataType,
+                                     Problem::kBlockSize,
+                                     TileGemmShape<Problem::BlockFmhaShape::kM0,
+                                                   Problem::BlockFmhaShape::kN0,
+                                                   Problem::BlockFmhaShape::kK0>>;
+
+        constexpr auto warp_gemm = []() {
+            if constexpr(std::is_same_v<typename Problem::QDataType, half_t> &&
+                         std::is_same_v<typename Problem::KDataType, half_t> &&
+                         std::is_same_v<typename Problem::SaccDataType, float>)
+            {
+                return WarpGemmMfmaF16F16F32M16N16K32SwizzleBTransposedCDistribution{};
+            }
+            else if constexpr(std::is_same_v<typename Problem::QDataType, bf16_t> &&
+                              std::is_same_v<typename Problem::KDataType, bf16_t> &&
+                              std::is_same_v<typename Problem::SaccDataType, float>)
+            {
+                return WarpGemmMfmaBf16Bf16F32M16N16K32SwizzleBTransposedCDistribution{};
+            }
+            else if constexpr(Problem::kIsFp8)
+            {
+                constexpr index_t swizzle_factor = 4; // TODO: hard coded here
+                return WarpGemmImpl<
+                    WarpGemmAtrributeMfmaIterateKAndTransposedCDistribution_SwizzleB<
+                        WarpGemmAttributeMfmaImpl_f32_32x32x16_f8_base<typename Problem::QDataType,
+                                                                       typename Problem::KDataType>,
+                        2,
+                        swizzle_factor>>{};
+            }
+        }();
+
+        using BlockGemmPolicy =
+            BlockGemmASmemBSmemCRegV1CustomPolicy<typename Problem::QDataType,
+                                                  typename Problem::KDataType,
+                                                  typename Problem::SaccDataType,
+                                                  typename Problem::BlockFmhaShape::Gemm0BlockWarps,
+                                                  decltype(warp_gemm)>;
+
+        return BlockGemmASmemBSmemCRegV1<BlockGemmProblem, BlockGemmPolicy>{};
+    }
+};
+
+// This pipeline is qkv all located in LDS
+template <bool QLoadOnce_,
+          bool AsyncCopyK_,
+          bool AsyncCopyV_,
+          index_t NumPrefetchK_,
+          index_t NumPrefetchV_>
+struct BlockFmhaPipelineQXKSVSCustomPolicy : BlockFmhaPipelineQXCustomPolicy<QLoadOnce_>
+{
+    static constexpr bool AsyncCopyK = AsyncCopyK_;
+    static constexpr bool AsyncCopyV = AsyncCopyV_; // TODO: this not supported yet
+
+    static constexpr index_t NumPrefetchK = NumPrefetchK_;
+    static constexpr index_t NumPrefetchV = NumPrefetchK_;
+
+    using QXPolicy = BlockFmhaPipelineQXCustomPolicy<QLoadOnce_>;
+
+    template <index_t k_prefetches_, index_t v_prefetches_, index_t k_loops_, index_t v_loops_>
+    struct LdsBufferSequence
+    {
+        static constexpr auto Make()
+        {
+            return transform_sequences(
+                [&](auto i) {
+                    if(i < k_loops_)
+                        return i % k_prefetches_;
+                    return (i - k_loops_) % v_prefetches_;
+                },
+                typename arithmetic_sequence_gen<0, k_loops_ + v_loops_, 1>::type{});
+        };
+
+        using type = remove_cvref_t<decltype(Make())>;
+    };
+    // clang-format off
+    template<> struct
+    LdsBufferSequence<3, 3, 4, 4> { using type = sequence<1, 2, 0, 1,   0, 1, 2, 0>; };
+
+    template<> struct
+    LdsBufferSequence<3, 3, 4, 2> { using type = sequence<1, 2, 0, 1,   2, 0>; };
+
+    template<> struct
+    LdsBufferSequence<3, 3, 2, 4> { using type = sequence<1, 2,         0, 1, 2, 0>; };
+
+    template<> struct
+    LdsBufferSequence<3, 3, 3, 3> { using type = sequence<1, 2, 0,      1, 2, 0>; };
+
+    template<> struct
+    LdsBufferSequence<3, 3, 2, 2> { using type = sequence<1, 2,         1, 0>;};
+    // clang-format on
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetLdsBufferSequence()
+    {
+        using BlockFmhaShape = remove_cvref_t<typename Problem::BlockFmhaShape>;
+
+        constexpr index_t kN0            = BlockFmhaShape::kN0;
+        constexpr index_t kK0            = BlockFmhaShape::kK0;
+        constexpr index_t kK1            = BlockFmhaShape::kK1;
+        constexpr index_t kK0BlockLength = BlockFmhaShape::kK0BlockLength;
+
+        constexpr index_t k0_loops = kK0BlockLength / kK0;
+        constexpr index_t k1_loops = kN0 / kK1;
+
+        return typename LdsBufferSequence<NumPrefetchK, NumPrefetchV, k0_loops, k1_loops>::type{};
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetSmemKPackK()
+    {
+        // TODO: this is for 3d layout
+        using KDataType = remove_cvref_t<typename Problem::KDataType>;
+        return 16 / sizeof(KDataType);
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetAlignmentK()
+    {
+        using KDataType = remove_cvref_t<typename Problem::KDataType>;
+        if constexpr(AsyncCopyK)
+        {
+            return 4 / sizeof(KDataType);
+        }
+        else
+        {
+            return 16 / sizeof(KDataType);
+        }
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetSmemKPackV()
+    {
+        // TODO: this is for 3d layout
+        using VDataType = remove_cvref_t<typename Problem::VDataType>;
+        return 16 / sizeof(VDataType);
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetAlignmentV()
+    {
+        using VLayout   = remove_cvref_t<typename Problem::BlockFmhaShape::VLayout>;
+        using VDataType = remove_cvref_t<typename Problem::VDataType>;
+        if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+        {
+            constexpr index_t kBlockSize   = Problem::kBlockSize;
+            constexpr index_t kNPerBlock   = Problem::BlockFmhaShape::kN1;
+            constexpr index_t kKPerBlock   = Problem::BlockFmhaShape::kK1;
+            constexpr index_t total_pixels = kNPerBlock * kKPerBlock / kBlockSize;
+
+            // TODO: not correct!
+            if constexpr(total_pixels > 4)
+                return 4;
+            else
+                return 2;
+        }
+        else
+        {
+            return 16 / sizeof(VDataType);
+        }
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetAlignmentBias()
+    {
+        using BlockGemm = remove_cvref_t<decltype(QXPolicy::template GetQKBlockGemm<Problem>())>;
+        constexpr auto config = BlockGemm::Policy::template GetWarpGemmMWarpNWarp<Problem>();
+        using WG              = remove_cvref_t<decltype(config.template at<0>())>;
+        using CWarpDstr       = typename WG::CWarpDstr;
+        constexpr auto vec =
+            CWarpDstr{}.get_ys_to_d_descriptor().get_lengths().at(number<CWarpDstr::NDimY - 1>{});
+        return vec;
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetAlignmentO()
+    {
+        using BlockGemm       = remove_cvref_t<decltype(GetKVBlockGemm<Problem>())>;
+        constexpr auto config = BlockGemm::Policy::template GetWarpGemmMWarpNWarp<Problem>();
+        using WG              = remove_cvref_t<decltype(config.template at<0>())>;
+        using CWarpDstr       = typename WG::CWarpDstr;
+        constexpr auto vec =
+            CWarpDstr{}.get_ys_to_d_descriptor().get_lengths().at(number<CWarpDstr::NDimY - 1>{});
+        return vec;
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetSingleSmemElementSpaceSize()
+    {
+        // this function assume K/V can share smem
+        constexpr index_t SingleKSize = [&]() {
+            if constexpr(!AsyncCopyK)
+            {
+                return MakeKLdsBlockDescriptor<Problem>().get_element_space_size();
+            }
+            else
+            {
+                constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN0;
+                constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK1;
+                constexpr index_t NumWarps   = Problem::BlockFmhaShape::NumWarps;
+                constexpr index_t warpSize   = ck_tile::get_warp_size();
+
+                constexpr index_t KPack   = GetSmemKPackK<Problem>(); // this is for lds
+                constexpr index_t KVector = GetAlignmentK<Problem>(); // this is for global load
+                constexpr index_t kPad    = KPack;
+
+                static_assert(warpSize * KVector >= kKPerBlock &&
+                              warpSize * KVector % kKPerBlock == 0);
+                constexpr index_t LanesPerK  = kKPerBlock / KVector;
+                constexpr index_t LaneGroups = warpSize / LanesPerK;
+                constexpr index_t NumIssues  = kNPerBlock / (LaneGroups * NumWarps);
+
+                return NumIssues * NumWarps * (warpSize * KVector + kPad);
+            }
+        }();
+
+        constexpr index_t SingleVSize = [&]() {
+            using VDataType                = remove_cvref_t<typename Problem::VDataType>;
+            constexpr index_t Banks        = 32; // TODO: need change based on arch
+            constexpr index_t PixelsPerRow = Banks * 4 / sizeof(VDataType);
+            constexpr index_t kKPack       = GetSmemKPackK<Problem>();
+            static_assert(PixelsPerRow % kKPack == 0);
+            constexpr index_t NPerRow    = PixelsPerRow / kKPack;
+            constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN1;
+            constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK1;
+            static_assert(kNPerBlock % NPerRow == 0);
+            static_assert(kKPerBlock % kKPack == 0);
+
+            return (kKPerBlock / kKPack) * (kNPerBlock / NPerRow) * (PixelsPerRow + kKPack);
+        }();
+
+        return max(SingleKSize, SingleVSize);
+    }
+
+    template <typename Problem, typename BlockGemm>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeQRegBlockDescriptor()
+    {
+        constexpr index_t kMPerBlock = Problem::BlockFmhaShape::kM0;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK0BlockLength;
+
+        constexpr auto config = BlockGemm::Policy::template GetWarpGemmMWarpNWarp<Problem>();
+
+        using WG = remove_cvref_t<decltype(config.template at<0>())>;
+
+        constexpr index_t MWarp = config.template at<1>();
+        constexpr index_t NWarp = config.template at<2>();
+
+        constexpr index_t MIterPerWarp = kMPerBlock / (MWarp * WG::kM);
+        constexpr index_t KIterPerWarp = kKPerBlock / WG::kK;
+
+        constexpr auto q_block_outer_dstr_encoding =
+            tile_distribution_encoding<sequence<NWarp>,
+                                       tuple<sequence<MIterPerWarp, MWarp>, sequence<KIterPerWarp>>,
+                                       tuple<sequence<1, 0>>,
+                                       tuple<sequence<1, 0>>,
+                                       sequence<1, 2>,
+                                       sequence<0, 0>>{};
+
+        constexpr auto q_block_dstr_encode = detail::make_embed_tile_distribution_encoding(
+            q_block_outer_dstr_encoding, typename WG::AWarpDstrEncoding{});
+
+        constexpr auto q_block_dstr = make_static_tile_distribution(q_block_dstr_encode);
+
+        return q_block_dstr;
+    }
+
+    // TODO: this is used for non async copy desc. unify in the future
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeKLdsBlockDescriptor()
+    {
+        constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN0;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK1;
+        constexpr index_t kKPack     = GetSmemKPackK<Problem>();
+
+        constexpr auto k_lds_block_desc_0 = make_naive_tensor_descriptor(
+            make_tuple(number<kKPerBlock / kKPack>{}, number<kNPerBlock>{}, number<kKPack>{}),
+            make_tuple(number<(kNPerBlock + 1) * kKPack>{}, number<kKPack>{}, number<1>{}),
+            number<8>{},
+            number<1>{});
+
+        constexpr auto k_lds_block_desc = transform_tensor_descriptor(
+            k_lds_block_desc_0,
+            make_tuple(
+                make_pass_through_transform(number<kNPerBlock>{}),
+                make_merge_transform(make_tuple(number<kKPerBlock / kKPack>{}, number<kKPack>{}))),
+            make_tuple(sequence<1>{}, sequence<0, 2>{}),
+            make_tuple(sequence<0>{}, sequence<1>{}));
+
+        return k_lds_block_desc;
+    }
+
+    template <typename Problem, index_t IBuf = 0>
+    CK_TILE_HOST_DEVICE static constexpr auto
+        MakeKLdsStoreBlockDescriptor(number<IBuf> = number<0>{})
+    {
+        // K is always k-major, we use async-copy to load into LDS
+        constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN0;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK1;
+        constexpr index_t kBlockSize = Problem::kBlockSize;
+        constexpr index_t NumWarps   = Problem::BlockFmhaShape::NumWarps;
+        constexpr index_t warpSize   = ck_tile::get_warp_size();
+
+        constexpr index_t KPack   = GetSmemKPackK<Problem>(); // this is for lds
+        constexpr index_t KVector = GetAlignmentK<Problem>(); // this is for global load
+        constexpr index_t kPad =
+            KPack; // for async-copy, this pad is between warps. Optimize this for lds_read speed
+
+        static_assert(warpSize * KVector >= kKPerBlock && warpSize * KVector % kKPerBlock == 0);
+        constexpr index_t LanesPerK =
+            kKPerBlock / KVector; // how many lane (within a wave) to load K
+        constexpr index_t LaneGroups =
+            warpSize /
+            LanesPerK; // how many groups (within a wave), they may load different N, but same K
+        constexpr index_t NumIssues = kNPerBlock / (LaneGroups * NumWarps);
+        static_assert(NumIssues == kNPerBlock * kKPerBlock / (kBlockSize * KVector));
+
+        constexpr auto k_lds_block_desc_0 = make_naive_tensor_descriptor_with_offset(
+            make_tuple(number<NumIssues>{},  // n0
+                       number<LaneGroups>{}, // n1
+                       number<NumWarps>{},   // n2
+                       number<LanesPerK>{},  // k0
+                       number<KVector>{}),   // k1
+            make_tuple(number<NumWarps*(warpSize * KVector + kPad)>{},
+                       number<kKPerBlock>{},
+                       number<warpSize * KVector + kPad>{},
+                       number<KVector>{},
+                       number<1>{}),
+            number<IBuf * GetSingleSmemElementSpaceSize<Problem>()>{},
+            number<KVector>{},
+            number<1>{});
+
+        // TODO this layout is hard coded, and will be used in async copy buffer view load
+        // in LDS the real layout is (bufs, N0, N2, N1*K0*K1)
+        constexpr auto k_lds_block_desc_issues_warps_lanes = transform_tensor_descriptor(
+            k_lds_block_desc_0,
+            make_tuple(make_pass_through_transform(number<NumIssues>{}),
+                       make_pass_through_transform(number<NumWarps>{}),
+                       make_merge_transform(make_tuple(
+                           number<LaneGroups>{}, number<LanesPerK>{}, number<KVector>{}))),
+            make_tuple(sequence<0>{}, sequence<2>{}, sequence<1, 3, 4>{}),
+            make_tuple(sequence<0>{}, sequence<1>{}, sequence<2>{}));
+
+        return k_lds_block_desc_issues_warps_lanes;
+    }
+
+#if K_LDS_LOAD_USE_OFFSET_TRANSFORM
+    template <typename Problem, index_t IBuf = 0>
+    CK_TILE_HOST_DEVICE static constexpr auto
+        MakeKLdsLoadBlockDescriptor(number<IBuf> = number<0>{})
+    {
+        // K is always k-major, we use async-copy to load into LDS
+        constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN0;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK1;
+        constexpr index_t kBlockSize = Problem::kBlockSize;
+        constexpr index_t NumWarps   = Problem::BlockFmhaShape::NumWarps;
+        constexpr index_t warpSize   = ck_tile::get_warp_size();
+
+        constexpr index_t KPack   = GetSmemKPackK<Problem>(); // this is for lds
+        constexpr index_t KVector = GetAlignmentK<Problem>(); // this is for global load
+        constexpr index_t kPad    = KPack; // for async-copy, this pad is between warps
+
+        static_assert(warpSize * KVector >= kKPerBlock && warpSize * KVector % kKPerBlock == 0);
+        constexpr index_t LanesPerK  = kKPerBlock / KVector; // within a wave
+        constexpr index_t LaneGroups = warpSize / LanesPerK; // within a wave
+        constexpr index_t NumIssues  = kNPerBlock / (LaneGroups * NumWarps);
+        static_assert(NumIssues == kNPerBlock * kKPerBlock / (kBlockSize * KVector));
+
+        constexpr auto k_lds_block_desc_0 = make_naive_tensor_descriptor_with_offset(
+            make_tuple(number<NumIssues>{},          // n0
+                       number<NumWarps>{},           // n2
+                       number<LaneGroups>{},         // n1
+                       number<kKPerBlock / KPack>{}, // k0
+                       number<KPack>{}),             // k1
+            make_tuple(number<NumWarps*(warpSize * KVector + kPad)>{},
+                       number<warpSize * KVector + kPad>{},
+                       number<kKPerBlock>{},
+                       number<KPack>{},
+                       number<1>{}),
+            number<IBuf * GetSingleSmemElementSpaceSize<Problem>()>{},
+            number<KPack>{},
+            number<1>{});
+
+        constexpr auto k_lds_block_desc = transform_tensor_descriptor(
+            k_lds_block_desc_0,
+            make_tuple(
+                make_merge_transform(
+                    make_tuple(number<NumIssues>{}, number<LaneGroups>{}, number<NumWarps>{})),
+                make_merge_transform(make_tuple(number<kKPerBlock / KPack>{}, number<KPack>{}))),
+            make_tuple(sequence<0, 2, 1>{}, sequence<3, 4>{}),
+            make_tuple(sequence<0>{}, sequence<1>{}));
+
+        return k_lds_block_desc;
+    }
+#else
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeKLdsLoadBlockDescriptor()
+    {
+        // K is always k-major, we use async-copy to load into LDS
+        constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN0;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK1;
+        constexpr index_t kBlockSize = Problem::kBlockSize;
+        constexpr index_t NumWarps   = Problem::BlockFmhaShape::NumWarps;
+        constexpr index_t warpSize   = ck_tile::get_warp_size();
+
+        constexpr index_t KPack   = GetSmemKPackK<Problem>(); // this is for lds
+        constexpr index_t KVector = GetAlignmentK<Problem>(); // this is for global load
+        constexpr index_t kPad    = KPack; // for async-copy, this pad is between warps
+
+        static_assert(warpSize * KVector >= kKPerBlock && warpSize * KVector % kKPerBlock == 0);
+        constexpr index_t LanesPerK  = kKPerBlock / KVector; // within a wave
+        constexpr index_t LaneGroups = warpSize / LanesPerK; // within a wave
+        constexpr index_t NumIssues  = kNPerBlock / (LaneGroups * NumWarps);
+        static_assert(NumIssues == kNPerBlock * kKPerBlock / (kBlockSize * KVector));
+        // constexpr index_t SingleKSize = NumIssues * NumWarps * (warpSize * KVector + kPad);
+        // constexpr index_t SingleVSize =
+        // MakeVLdsBlockDescriptor<Problem>().get_element_space_size();
+        constexpr index_t BufferSize =
+            GetSingleSmemElementSpaceSize<Problem>(); //  max(SingleKSize, SingleVSize);
+
+        constexpr auto k_lds_block_desc_0 =
+            make_naive_tensor_descriptor(make_tuple(number<NumPrefetchK>{},       // num_buffers
+                                                    number<NumIssues>{},          // n0
+                                                    number<NumWarps>{},           // n2
+                                                    number<LaneGroups>{},         // n1
+                                                    number<kKPerBlock / KPack>{}, // k0
+                                                    number<KPack>{}),             // k1
+                                         make_tuple(number<BufferSize>{},
+                                                    number<NumWarps*(warpSize * KVector + kPad)>{},
+                                                    number<warpSize * KVector + kPad>{},
+                                                    number<kKPerBlock>{},
+                                                    number<KPack>{},
+                                                    number<1>{}),
+                                         number<KPack>{},
+                                         number<1>{});
+
+        constexpr auto k_lds_block_desc = transform_tensor_descriptor(
+            k_lds_block_desc_0,
+            make_tuple(
+                make_merge_transform(make_tuple(number<NumPrefetchK>{},
+                                                number<NumIssues>{},
+                                                number<LaneGroups>{},
+                                                number<NumWarps>{})),
+                make_merge_transform(make_tuple(number<kKPerBlock / KPack>{}, number<KPack>{}))),
+            make_tuple(sequence<0, 1, 3, 2>{}, sequence<4, 5>{}),
+            make_tuple(sequence<0>{}, sequence<1>{}));
+
+        return k_lds_block_desc;
+    }
+#endif
+
+    // 3d + padding
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeVLdsBlockDescriptor()
+    {
+        using VDataType                = remove_cvref_t<typename Problem::VDataType>;
+        constexpr index_t Banks        = 32; // TODO: need change based on arch
+        constexpr index_t PixelsPerRow = Banks * 4 / sizeof(VDataType);
+        constexpr index_t kKPack       = GetSmemKPackV<Problem>();
+        static_assert(PixelsPerRow % kKPack == 0);
+        constexpr index_t NPerRow    = PixelsPerRow / kKPack;
+        constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN1;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK1;
+        static_assert(kNPerBlock % NPerRow == 0);
+        static_assert(kKPerBlock % kKPack == 0);
+
+        constexpr auto v_lds_block_desc_0 = make_naive_tensor_descriptor(
+            make_tuple(number<NumPrefetchV>{},
+                       number<kKPerBlock / kKPack>{},
+                       number<kNPerBlock / NPerRow>{},
+                       number<NPerRow>{},
+                       number<kKPack>{}),
+            make_tuple(number<GetSingleSmemElementSpaceSize<Problem>()>{},
+                       number<(kNPerBlock / NPerRow) * (PixelsPerRow + kKPack)>{},
+                       number<PixelsPerRow + kKPack>{},
+                       number<kKPack>{},
+                       number<1>{}),
+            number<kKPack>{},
+            number<1>{});
+
+        constexpr auto v_lds_block_desc = transform_tensor_descriptor(
+            v_lds_block_desc_0,
+            make_tuple(
+                make_merge_transform(make_tuple(
+                    number<NumPrefetchV>{}, number<kNPerBlock / NPerRow>{}, number<NPerRow>{})),
+                make_merge_transform(make_tuple(number<kKPerBlock / kKPack>{}, number<kKPack>{}))),
+            make_tuple(sequence<0, 2, 3>{}, sequence<1, 4>{}),
+            make_tuple(sequence<0>{}, sequence<1>{}));
+
+        return v_lds_block_desc;
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr ck_tile::index_t GetSmemSize()
+    {
+        // TODO: assume Q is in register
+        // TODO: assume K/V has same data type
+        constexpr index_t single_smem_size =
+            GetSingleSmemElementSpaceSize<Problem>() * sizeof(typename Problem::KDataType);
+
+        return QXPolicy::template GetSmemSizeQ<Problem>() +
+               single_smem_size * max(NumPrefetchK, NumPrefetchV);
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeKDramTileDistribution()
+    {
+        if constexpr(!AsyncCopyK)
+        {
+            using KDataType = remove_cvref_t<typename Problem::KDataType>;
+
+            constexpr index_t kBlockSize = Problem::kBlockSize;
+            constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN0;
+            constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK0;
+
+            constexpr index_t K1 = 16 / sizeof(KDataType);
+            constexpr index_t K0 = kKPerBlock / K1;
+            constexpr index_t N2 = get_warp_size() / K0;
+            constexpr index_t N1 = kBlockSize / get_warp_size();
+            constexpr index_t N0 = kNPerBlock / (N2 * N1);
+
+            return make_static_tile_distribution(
+                tile_distribution_encoding<sequence<1>,
+                                           tuple<sequence<N0, N1, N2>, sequence<K0, K1>>,
+                                           tuple<sequence<1>, sequence<1, 2>>,
+                                           tuple<sequence<1>, sequence<2, 0>>,
+                                           sequence<1, 2>,
+                                           sequence<0, 1>>{});
+        }
+        else
+        {
+            constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN0;
+            constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK1;
+            constexpr index_t kBlockSize = Problem::kBlockSize;
+            constexpr index_t NumWarps   = Problem::BlockFmhaShape::NumWarps;
+            constexpr index_t warpSize   = ck_tile::get_warp_size();
+
+            constexpr index_t KVector = GetAlignmentK<Problem>(); // this is for global load
+
+            static_assert(warpSize * KVector >= kKPerBlock && warpSize * KVector % kKPerBlock == 0);
+            constexpr index_t LanesPerK  = kKPerBlock / KVector; // within a wave
+            constexpr index_t LaneGroups = warpSize / LanesPerK; // within a wave
+            constexpr index_t NumIssues  = kNPerBlock / (LaneGroups * NumWarps);
+            static_assert(NumIssues == kNPerBlock * kKPerBlock / (kBlockSize * KVector));
+
+            constexpr index_t N0 = NumIssues;
+            constexpr index_t N1 = LaneGroups;
+            constexpr index_t N2 = NumWarps;
+            constexpr index_t K0 = LanesPerK;
+            constexpr index_t K1 = KVector;
+
+            return make_static_tile_distribution(
+                tile_distribution_encoding<sequence<1>,
+                                           tuple<sequence<N0, N1, N2>, sequence<K0, K1>>,
+                                           tuple<sequence<1>, sequence<1, 2>>,
+                                           tuple<sequence<2>, sequence<1, 0>>,
+                                           sequence<1, 2>,
+                                           sequence<0, 1>>{});
+        }
+    }
+
+    template <typename Problem>
+    CK_TILE_DEVICE static constexpr auto MakeVDramTileDistribution()
+    {
+        using VLayout = remove_cvref_t<typename Problem::BlockFmhaShape::VLayout>;
+
+        constexpr index_t kBlockSize = Problem::kBlockSize;
+        constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN1;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK1;
+
+        if constexpr(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>)
+        {
+            constexpr index_t N1 = GetAlignmentV<Problem>();
+            constexpr index_t N0 = kNPerBlock / N1; // P
+
+            constexpr index_t total_pixels = kNPerBlock * kKPerBlock / kBlockSize;
+            static_assert(total_pixels % N1 == 0); // TODO: this is not always true?
+            constexpr index_t K3     = total_pixels / N1;
+            constexpr index_t kKPack = GetSmemKPackV<Problem>();
+            static_assert(kKPack % K3 == 0);
+            constexpr index_t K2 = kKPack / K3; // TODO: this dimention could be outside single wave
+            if constexpr(get_warp_size() % (K2 * N0) == 0)
+            {
+                constexpr index_t K1 = get_warp_size() / (K2 * N0);
+                constexpr index_t K0 = kBlockSize / get_warp_size();
+                static_assert(kKPerBlock == K0 * K1 * K2 * K3);
+                return make_static_tile_distribution(
+                    tile_distribution_encoding<sequence<1>,
+                                               tuple<sequence<N0, N1>, sequence<K0, K1, K2, K3>>,
+                                               tuple<sequence<2>, sequence<2, 1, 2>>,
+                                               tuple<sequence<0>, sequence<1, 0, 2>>,
+                                               sequence<2, 1>,
+                                               sequence<3, 1>>{});
+            }
+            else
+            {
+                constexpr index_t K1   = (K2 * N0) / get_warp_size();
+                constexpr index_t K2_m = K2 / K1;
+                constexpr index_t K0   = kBlockSize / get_warp_size() / K1;
+                static_assert(kKPerBlock == K0 * K1 * K2_m * K3);
+                return make_static_tile_distribution(
+                    tile_distribution_encoding<sequence<1>,
+                                               tuple<sequence<N0, N1>, sequence<K0, K1, K2_m, K3>>,
+                                               tuple<sequence<2, 2>, sequence<1, 2>>,
+                                               tuple<sequence<0, 1>, sequence<0, 2>>,
+                                               sequence<2, 1>,
+                                               sequence<3, 1>>{});
+            }
+        }
+        else
+        {
+            constexpr index_t K1 = GetAlignmentV<Problem>();
+            constexpr index_t K0 = kKPerBlock / K1;
+            constexpr index_t N2 = get_warp_size() / K0;
+            constexpr index_t N1 = kBlockSize / get_warp_size();
+            constexpr index_t N0 = kNPerBlock / (N2 * N1);
+            static_assert(N0 != 0);
+
+            return make_static_tile_distribution(
+                tile_distribution_encoding<sequence<1>,
+                                           tuple<sequence<N0, N1, N2>, sequence<K0, K1>>,
+                                           tuple<sequence<1>, sequence<1, 2>>,
+                                           tuple<sequence<1>, sequence<2, 0>>,
+                                           sequence<1, 2>,
+                                           sequence<0, 1>>{});
+        }
+    }
+
+    template <typename Problem, typename BlockGemm>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeBiasDramTileDistribution()
+    {
+        constexpr index_t MPerBlock = Problem::BlockFmhaShape::kM0;
+        constexpr index_t NPerBlock = Problem::BlockFmhaShape::kN0;
+
+        constexpr auto config = BlockGemm::Policy::template GetWarpGemmMWarpNWarp<Problem>();
+        using WG              = remove_cvref_t<decltype(config.template at<0>())>;
+
+        constexpr index_t MWarp = config.template at<1>();
+        constexpr index_t NWarp = config.template at<2>();
+
+        constexpr index_t MIterPerWarp = MPerBlock / (MWarp * WG::kM);
+        constexpr index_t NIterPerWarp = NPerBlock / (NWarp * WG::kN);
+
+        // Construct C-Block-HostTensor
+        constexpr auto c_block_outer_dstr_encoding = tile_distribution_encoding<
+            sequence<>,
+            tuple<sequence<MIterPerWarp, MWarp>, sequence<NIterPerWarp, NWarp>>,
+            tuple<sequence<1, 2>>,
+            tuple<sequence<1, 1>>,
+            sequence<1, 2>,
+            sequence<0, 0>>{};
+
+        constexpr auto c_block_dstr_encode = detail::make_embed_tile_distribution_encoding(
+            c_block_outer_dstr_encoding, typename WG::CWarpDstrEncoding{});
+
+        constexpr auto c_block_dstr = make_static_tile_distribution(c_block_dstr_encode);
+
+        return c_block_dstr;
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeShuffledVRegBlockDescriptor()
+    {
+        // This descriptor only used when V layout is seqlen * hdim
+        using VLayout = remove_cvref_t<typename Problem::BlockFmhaShape::VLayout>;
+        static_assert(std::is_same_v<VLayout, ck_tile::tensor_layout::gemm::RowMajor>);
+        constexpr index_t kBlockSize = Problem::kBlockSize;
+        constexpr index_t kNPerBlock = Problem::BlockFmhaShape::kN1;
+        constexpr index_t kKPerBlock = Problem::BlockFmhaShape::kK1;
+
+        constexpr index_t N1           = GetAlignmentV<Problem>();
+        constexpr index_t N0           = kNPerBlock / N1;
+        constexpr index_t total_pixels = kNPerBlock * kKPerBlock / kBlockSize;
+        static_assert(total_pixels % N1 == 0); // TODO: this is not always true?
+        constexpr index_t K3     = total_pixels / N1;
+        constexpr index_t kKPack = GetSmemKPackV<Problem>();
+        static_assert(kKPack % K3 == 0);
+        constexpr index_t K2 = kKPack / K3; // TODO: this dimention could be outside single wave
+        if constexpr(get_warp_size() % (K2 * N0) == 0)
+        {
+            constexpr index_t K1 = get_warp_size() / (K2 * N0);
+            constexpr index_t K0 = kBlockSize / get_warp_size();
+
+            return make_static_tile_distribution(
+                tile_distribution_encoding<sequence<1>,
+                                           tuple<sequence<N0, N1>, sequence<K0, K1, K2, K3>>,
+                                           tuple<sequence<2>, sequence<2, 1, 2>>,
+                                           tuple<sequence<0>, sequence<1, 0, 2>>,
+                                           sequence<1, 2>,
+                                           sequence<1, 3>>{});
+        }
+        else
+        {
+            constexpr index_t K1   = (K2 * N0) / get_warp_size();
+            constexpr index_t K2_m = K2 / K1;
+            constexpr index_t K0   = kBlockSize / get_warp_size() / K1;
+            static_assert(kKPerBlock == K0 * K1 * K2_m * K3);
+            return make_static_tile_distribution(
+                tile_distribution_encoding<sequence<1>,
+                                           tuple<sequence<N0, N1>, sequence<K0, K1, K2_m, K3>>,
+                                           tuple<sequence<2, 2>, sequence<1, 2>>,
+                                           tuple<sequence<0, 1>, sequence<0, 2>>,
+                                           sequence<1, 2>,
+                                           sequence<1, 3>>{});
+        }
+    }
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetKVBlockGemm()
+    {
+        using BlockGemmProblem =
+            BlockGemmPipelineProblem<typename Problem::PDataType,
+                                     typename Problem::VDataType,
+                                     typename Problem::OaccDataType,
+                                     Problem::kBlockSize,
+                                     TileGemmShape<Problem::BlockFmhaShape::kM0,
+                                                   Problem::BlockFmhaShape::kN1,
+                                                   Problem::BlockFmhaShape::kK1>>;
+
+        auto warp_gemm = [&]() {
+            if constexpr(Problem::kIsFp8)
+            {
+                return WarpGemmImpl<WarpGemmAtrributeMfmaIterateKAndTransposedCDistribution<
+                    WarpGemmAttributeMfmaImpl_f32_32x32x16_f8_base<typename Problem::PDataType,
+                                                                   typename Problem::VDataType>,
+                    2>>{};
+                // return
+                // WarpGemmImpl<WarpGemmAtrributeMfmaTransposedCDistribution_SwizzleB<
+                //         WarpGemmAttributeMfmaImpl_f32_32x32x16_f8_base<typename
+                //         Problem::PDataType, typename Problem::VDataType>>>{};
+            }
+            else
+            {
+                return WarpGemmMfmaDispatcher<
+                    typename Problem::PDataType,
+                    typename Problem::VDataType,
+                    typename Problem::OaccDataType,
+                    Problem::BlockFmhaShape::Gemm1WarpTile::at(number<0>{}),
+                    Problem::BlockFmhaShape::Gemm1WarpTile::at(number<1>{}),
+                    Problem::BlockFmhaShape::Gemm1WarpTile::at(number<2>{}),
+                    true>{};
+            }
+        }();
+
+        using WarpGemm = remove_cvref_t<decltype(warp_gemm)>;
+
+        using BlockGemmPolicy =
+            BlockGemmARegBSmemCRegV2CustomPolicy<typename Problem::PDataType,
+                                                 typename Problem::VDataType,
+                                                 typename Problem::OaccDataType,
+                                                 typename Problem::BlockFmhaShape::Gemm1BlockWarps,
+                                                 WarpGemm>;
+        return BlockGemmARegBSmemCRegV2<BlockGemmProblem, BlockGemmPolicy>{};
+    }
+};
+
+} // namespace ck_tile

include/ck_tile/ops/fmha/pipeline/tile_fmha_shape.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+
+namespace ck_tile {
+
+template <typename BlockTile_, // sequence<...
+          typename Gemm0BlockWarps_,
+          typename Gemm0WarpTile_,
+          typename Gemm1BlockWarps_,
+          typename Gemm1WarpTile_,
+          bool IsVLayoutRowMajor_>
+struct TileFmhaShape
+{
+    using BlockTile       = remove_cvref_t<BlockTile_>;
+    using Gemm0BlockWarps = remove_cvref_t<Gemm0BlockWarps_>;
+    using Gemm0WarpTile   = remove_cvref_t<Gemm0WarpTile_>;
+    using Gemm1BlockWarps = remove_cvref_t<Gemm1BlockWarps_>;
+    using Gemm1WarpTile   = remove_cvref_t<Gemm1WarpTile_>;
+
+    static constexpr index_t NumWarps =
+        reduce_on_sequence(Gemm0BlockWarps{}, multiplies{}, number<1>{});
+
+    static_assert(NumWarps == reduce_on_sequence(Gemm1BlockWarps{}, multiplies{}, number<1>{}));
+
+    static constexpr index_t kM0 = BlockTile::at(number<0>{}); // tile size along q seqlen
+    static constexpr index_t kN0 = BlockTile::at(number<1>{}); // tile size along k seqlen
+    static constexpr index_t kK0 = BlockTile::at(number<2>{}); // tile size along qk gemm unroll
+    static constexpr index_t kN1 = BlockTile::at(number<3>{}); // tile size along v head_dim
+    static constexpr index_t kK1 = BlockTile::at(number<4>{}); // tile size along kv gemm unroll
+    static constexpr index_t kK0BlockLength =
+        BlockTile::at(number<5>{}); // total length of K0, used for pipeline that need load Q at
+                                    // once (or repeately load Q as a whole tile)
+    static_assert(kK0BlockLength % kK0 == 0, "kK0BlockLength should be divisible by kK0");
+
+    // v, rowmajor : seqlen*hdim, colmajor : hdim*seqlen
+    static constexpr bool IsVLayoutRowMajor = IsVLayoutRowMajor_;
+    using VLayout                           = std::conditional_t<IsVLayoutRowMajor,
+                                       ck_tile::tensor_layout::gemm::RowMajor,
+                                       ck_tile::tensor_layout::gemm::ColumnMajor>;
+};
+
+} // namespace ck_tile

include/ck_tile/ops/fmha/pipeline/tile_fmha_traits.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+
+namespace ck_tile {
+
+template <bool kPadSeqLenQ_ /* padding for seqlen_q */,
+          bool kPadSeqLenK_ /* padding for seqlen_k */,
+          bool kPadHeadDimQ_ /* paddding for hdim_q */,
+          bool kPadHeadDimV_ /* paddding for hdim_v */,
+          bool kHasBias_,
+          bool kStoreLSE_,
+          bool kDoFp8StaticQuant_,
+          index_t kBlockPerCu_ = -1 /* overwrite occupancy if not -1 */>
+struct TileFmhaTraits
+{
+    static constexpr bool kPadSeqLenQ       = kPadSeqLenQ_;
+    static constexpr bool kPadSeqLenK       = kPadSeqLenK_;
+    static constexpr bool kPadHeadDimQ      = kPadHeadDimQ_;
+    static constexpr bool kPadHeadDimV      = kPadHeadDimV_;
+    static constexpr bool kHasBias          = kHasBias_;
+    static constexpr bool kStoreLSE         = kStoreLSE_;
+    static constexpr bool kDoFp8StaticQuant = kDoFp8StaticQuant_;
+    static constexpr index_t kBlockPerCu    = kBlockPerCu_;
+};
+
+} // namespace ck_tile

include/ck_tile/ops/gemm.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2024, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bgmem_creg_problem.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bgmem_creg_v1.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bgmem_creg_v1_default_policy.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_problem.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v1.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v1_custom_policy.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v1_default_policy.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v2.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v2_custom_policy.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v2_default_policy.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_asmem_bsmem_creg_problem.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_asmem_bsmem_creg_v1.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_asmem_bsmem_creg_v1_custom_policy.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_asmem_bsmem_creg_v1_default_policy.hpp"
+#include "ck_tile/ops/gemm/pipeline/block_gemm_pipeline_agmem_bgmem_creg_v1.hpp"
+#include "ck_tile/ops/gemm/pipeline/block_gemm_pipeline_agmem_bgmem_creg_v1_default_policy.hpp"
+#include "ck_tile/ops/gemm/pipeline/block_gemm_pipeline_agmem_bgmem_creg_v2.hpp"
+#include "ck_tile/ops/gemm/pipeline/block_gemm_pipeline_agmem_bgmem_creg_v2_default_policy.hpp"
+#include "ck_tile/ops/gemm/pipeline/block_gemm_pipeline_problem.hpp"
+#include "ck_tile/ops/gemm/pipeline/tile_gemm_shape.hpp"
+#include "ck_tile/ops/gemm/warp/warp_gemm.hpp"
+#include "ck_tile/ops/gemm/warp/warp_gemm_attribute_mfma.hpp"
+#include "ck_tile/ops/gemm/warp/warp_gemm_attribute_mfma_impl.hpp"
+#include "ck_tile/ops/gemm/warp/warp_gemm_dispatcher.hpp"
+#include "ck_tile/ops/gemm/warp/warp_gemm_impl.hpp"
+#include "ck_tile/ops/common/tensor_layout.hpp"

include/ck_tile/ops/gemm/block/block_gemm_areg_bgmem_creg_problem.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+
+namespace ck_tile {
+// Problem Description for BlockGemmARegBGmemCReg
+template <typename ADataType_,
+          typename BDataType_,
+          typename CDataType_,
+          index_t kBlockSize_,
+          typename BlockGemmShape_>
+struct BlockGemmARegBGmemCRegProblem
+{
+    using ADataType      = remove_cvref_t<ADataType_>;
+    using BDataType      = remove_cvref_t<BDataType_>;
+    using CDataType      = remove_cvref_t<CDataType_>;
+    using BlockGemmShape = remove_cvref_t<BlockGemmShape_>;
+
+    static constexpr index_t kBlockSize = kBlockSize_;
+};
+
+} // namespace ck_tile

include/ck_tile/ops/gemm/block/block_gemm_areg_bgmem_creg_v1.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v1_default_policy.hpp"
+
+namespace ck_tile {
+
+// A is block distributed tensor
+// B is block window on global memory
+// C is block distributed tensor
+// This will:
+//   1. load B from global memory into shared memory and then
+//   2. Call BlockGemmARegSGmemCRegV1
+template <typename Problem_, typename Policy_ = BlockGemmARegBGmemCRegV1DefaultPolicy>
+struct BlockGemmARegBGmemCRegV1
+{
+    using Problem        = remove_cvref_t<Problem_>;
+    using Policy         = remove_cvref_t<Policy_>;
+    using ADataType      = remove_cvref_t<typename Problem::ADataType>;
+    using BDataType      = remove_cvref_t<typename Problem::BDataType>;
+    using CDataType      = remove_cvref_t<typename Problem::CDataType>;
+    using BlockGemmShape = remove_cvref_t<typename Problem::BlockGemmShape>;
+
+    static constexpr index_t kBlockSize = Problem::kBlockSize;
+
+    // use BlockGemmARegBSmemCRegV1 as the underlying block-GEMM implementation
+    using BlockGemmARegBSmemCRegImpl = BlockGemmARegBSmemCRegV1<
+        BlockGemmARegBSmemCRegProblem<ADataType, BDataType, CDataType, kBlockSize, BlockGemmShape>,
+        BlockGemmARegBSmemCRegV1DefaultPolicy>;
+
+    CK_TILE_HOST_DEVICE static constexpr ck_tile::index_t GetStaticLdsSize()
+    {
+        return sizeof(BDataType) *
+               Policy::template MakeBSmemBlockDescriptor<Problem>().get_element_space_size();
+    }
+
+    // C += A * B
+    template <typename CBlockTensor, typename ABlockTensor, typename BBlockGmemWindowTmp>
+    CK_TILE_DEVICE void operator()(CBlockTensor& c_block_tensor,
+                                   const ABlockTensor& a_block_tensor,
+                                   const BBlockGmemWindowTmp& b_block_gmem_window_tmp,
+                                   void* smem_ptr) const
+    {
+        static_assert(
+            std::is_same_v<ADataType, remove_cv_t<typename ABlockTensor::DataType>> &&
+                std::is_same_v<BDataType, remove_cv_t<typename BBlockGmemWindowTmp::DataType>> &&
+                std::is_same_v<CDataType, remove_cv_t<typename CBlockTensor::DataType>>,
+            "wrong!");
+
+        constexpr index_t MPerBlock = ABlockTensor{}.get_lengths()[number<0>{}];
+        constexpr index_t NPerBlock = BBlockGmemWindowTmp{}.get_window_lengths()[number<0>{}];
+        constexpr index_t KPerBlock = ABlockTensor{}.get_lengths()[number<1>{}];
+
+        static_assert(MPerBlock == BlockGemmShape::kM && NPerBlock == BlockGemmShape::kN &&
+                          KPerBlock == BlockGemmShape::kK,
+                      "wrong!");
+
+        const auto b_block_gmem_window =
+            make_tile_window(b_block_gmem_window_tmp.get_bottom_tensor_view(),
+                             make_tuple(number<NPerBlock>{}, number<KPerBlock>{}),
+                             b_block_gmem_window_tmp.get_window_origin(),
+                             Policy::template MakeBGmemTileDistribution<Problem>());
+
+        // B LDS and LDS window
+        auto b_block_smem = make_tensor_view<address_space_enum::lds>(
+            reinterpret_cast<BDataType*>(smem_ptr),
+            Policy::template MakeBSmemBlockDescriptor<Problem>());
+
+        auto b_block_smem_window = make_tile_window(
+            b_block_smem, make_tuple(number<MPerBlock>{}, number<KPerBlock>{}), {0, 0});
+
+        // load B tile from global mem
+        const auto b_block_tile = load_tile(b_block_gmem_window);
+
+        // store B tile into shared mem
+        store_tile(b_block_smem_window, b_block_tile);
+
+        // wait for store_tile to finish
+        block_sync_lds();
+
+        // block GEMM
+        BlockGemmARegBSmemCRegImpl{}(c_block_tensor, a_block_tensor, b_block_smem_window);
+    }
+
+    // C = A * B
+    template <typename ABlockTensor, typename BBlockGmemWindowTmp>
+    CK_TILE_DEVICE auto operator()(const ABlockTensor& a_block_tensor,
+                                   const BBlockGmemWindowTmp& b_block_gmem_window_tmp,
+                                   void* smem_ptr) const
+    {
+        static_assert(
+            std::is_same_v<ADataType, remove_cv_t<typename ABlockTensor::DataType>> &&
+                std::is_same_v<BDataType, remove_cv_t<typename BBlockGmemWindowTmp::DataType>>,
+            "wrong!");
+
+        constexpr index_t MPerBlock = ABlockTensor{}.get_lengths()[number<0>{}];
+        constexpr index_t NPerBlock = BBlockGmemWindowTmp{}.get_window_lengths()[number<0>{}];
+        constexpr index_t KPerBlock = ABlockTensor{}.get_lengths()[number<1>{}];
+
+        static_assert(MPerBlock == BlockGemmShape::kM && NPerBlock == BlockGemmShape::kN &&
+                          KPerBlock == BlockGemmShape::kK,
+                      "wrong!");
+
+        const auto b_block_gmem_window =
+            make_tile_window(b_block_gmem_window_tmp.get_bottom_tensor_view(),
+                             make_tuple(number<NPerBlock>{}, number<KPerBlock>{}),
+                             b_block_gmem_window_tmp.get_window_origin(),
+                             Policy::template MakeBGmemTileDistribution<Problem>());
+
+        // B LDS and LDS window
+        auto b_block_smem = make_tensor_view<address_space_enum::lds>(
+            reinterpret_cast<BDataType*>(smem_ptr),
+            Policy::template MakeBSmemBlockDescriptor<Problem>());
+
+        auto b_block_smem_window = make_tile_window(
+            b_block_smem, make_tuple(number<MPerBlock>{}, number<KPerBlock>{}), {0, 0});
+
+        // load B tile from global mem
+        const auto b_block_tile = load_tile(b_block_gmem_window);
+
+        // store B tile into shared mem
+        store_tile(b_block_smem_window, b_block_tile);
+
+        // wait for store_tile to finish
+        block_sync_lds();
+
+        // block GEMM
+        return BlockGemmARegBSmemCRegImpl{}(a_block_tensor, b_block_smem_window);
+    }
+};
+
+} // namespace ck_tile

include/ck_tile/ops/gemm/block/block_gemm_areg_bgmem_creg_v1_default_policy.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+
+namespace ck_tile {
+
+// Default policy for BlockGemmARegBGmemCRegV1
+// Default policy class should not be templated, put template on member functions instead
+struct BlockGemmARegBGmemCRegV1DefaultPolicy
+{
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeBGmemTileDistribution()
+    {
+        using BDataType = remove_cvref_t<typename Problem::BDataType>;
+
+        constexpr index_t kBlockSize = Problem::kBlockSize;
+        constexpr index_t kNPerBlock = Problem::BlockGemmShape::kN;
+        constexpr index_t kKPerBlock = Problem::BlockGemmShape::kK;
+
+        constexpr index_t K1 = 16 / sizeof(BDataType);
+        constexpr index_t K0 = kKPerBlock / K1;
+        constexpr index_t N2 = get_warp_size() / K0;
+        constexpr index_t N1 = kBlockSize / get_warp_size();
+        constexpr index_t N0 = kNPerBlock / (N2 * N1);
+
+        return make_static_tile_distribution(
+            tile_distribution_encoding<sequence<1>,
+                                       tuple<sequence<N0, N1, N2>, sequence<K0, K1>>,
+                                       tuple<sequence<1>, sequence<1, 2>>,
+                                       tuple<sequence<1>, sequence<2, 0>>,
+                                       sequence<1, 2>,
+                                       sequence<0, 1>>{});
+    }
+
+#if 0
+    // 2d
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeBLdsBlockDescriptor()
+    {
+        constexpr index_t kNPerBlock = Problem::BlockGemmShape::kN;
+        constexpr index_t kKPerBlock = Problem::BlockGemmShape::kK;
+
+        constexpr auto b_lds_block_desc =
+            make_naive_tensor_descriptor_packed(make_tuple(kNPerBlock, kKPerBlock), number<32>{});
+
+        return b_lds_block_desc;
+    }
+#elif 0
+    // 3d + padding
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeBSmemBlockDescriptor()
+    {
+        constexpr index_t kNPerBlock = Problem::BlockGemmShape::kN;
+        constexpr index_t kKPerBlock = Problem::BlockGemmShape::kK;
+
+        constexpr auto b_lds_block_desc_0 = make_naive_tensor_descriptor(
+            make_tuple(number<kKPerBlock / 8>{}, number<kNPerBlock>{}, number<8>{}),
+            make_tuple(number<(kNPerBlock + 1) * 8>{}, number<8>{}, number<1>{}),
+            number<8>{},
+            number<1>{});
+
+        constexpr auto b_lds_block_desc = transform_tensor_descriptor(
+            b_lds_block_desc_0,
+            make_tuple(make_pass_through_transform(kNPerBlock),
+                       make_merge_transform(make_tuple(kKPerBlock / 8, 8))),
+            make_tuple(sequence<1>{}, sequence<0, 2>{}),
+            make_tuple(sequence<0>{}, sequence<1>{}));
+
+        return b_lds_block_desc;
+    }
+#elif 1
+    // fake XOR
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto MakeBSmemBlockDescriptor()
+    {
+        using BDataType = remove_cvref_t<typename Problem::BDataType>;
+
+        constexpr index_t kNPerBlock = Problem::BlockGemmShape::kN;
+        constexpr index_t kKPerBlock = Problem::BlockGemmShape::kK;
+
+        constexpr auto b_lds_block_desc_d1_d2_d3 = make_naive_tensor_descriptor_packed(
+            make_tuple(number<kNPerBlock / 2>{}, number<2>{}, number<kKPerBlock>{}),
+            number<kKPerBlock>{});
+
+        constexpr index_t kK1 = 16 / sizeof(BDataType);
+
+        constexpr auto b_lds_block_desc_d4_d5_d6 = transform_tensor_descriptor(
+            b_lds_block_desc_d1_d2_d3,
+            make_tuple(
+                make_xor_transform(make_tuple(number<kNPerBlock / 2>{}, number<kKPerBlock>{}), kK1),
+                make_pass_through_transform(2)),
+            make_tuple(sequence<0, 2>{}, sequence<1>{}),
+            make_tuple(sequence<0, 2>{}, sequence<1>{}));
+
+        constexpr auto b_lds_block_desc_n_k = transform_tensor_descriptor(
+            b_lds_block_desc_d4_d5_d6,
+            make_tuple(make_merge_transform(make_tuple(number<kNPerBlock / 2>{}, number<2>{})),
+                       make_pass_through_transform(kKPerBlock)),
+            make_tuple(sequence<0, 1>{}, sequence<2>{}),
+            make_tuple(sequence<0>{}, sequence<1>{}));
+
+        return b_lds_block_desc_n_k;
+    }
+#endif
+};
+
+} // namespace ck_tile

include/ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_problem.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+
+namespace ck_tile {
+
+// Problem Description for BlockGemmARegBSmemCReg
+template <typename ADataType_,
+          typename BDataType_,
+          typename CDataType_,
+          index_t kBlockSize_,
+          typename BlockGemmShape_>
+struct BlockGemmARegBSmemCRegProblem
+{
+    using ADataType      = remove_cvref_t<ADataType_>;
+    using BDataType      = remove_cvref_t<BDataType_>;
+    using CDataType      = remove_cvref_t<CDataType_>;
+    using BlockGemmShape = remove_cvref_t<BlockGemmShape_>;
+
+    static constexpr index_t kBlockSize = kBlockSize_;
+};
+
+} // namespace ck_tile

include/ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v1.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bgmem_creg_v1_default_policy.hpp"
+
+namespace ck_tile {
+
+// A is block distributed tensor
+// B is block window on shared memory
+// C is block distributed tensor
+template <typename Problem_, typename Policy_ = BlockGemmARegBSmemCRegV1DefaultPolicy>
+struct BlockGemmARegBSmemCRegV1
+{
+    using Problem        = remove_cvref_t<Problem_>;
+    using Policy         = remove_cvref_t<Policy_>;
+    using ADataType      = remove_cvref_t<typename Problem::ADataType>;
+    using BDataType      = remove_cvref_t<typename Problem::BDataType>;
+    using CDataType      = remove_cvref_t<typename Problem::CDataType>;
+    using BlockGemmShape = remove_cvref_t<typename Problem::BlockGemmShape>;
+
+    static constexpr index_t kBlockSize = Problem::kBlockSize;
+
+    // C += A * B
+    template <typename CBlockTensor, typename ABlockTensorTmp, typename BBlockWindowTmp>
+    CK_TILE_DEVICE void operator()(CBlockTensor& c_block_tensor,
+                                   const ABlockTensorTmp& a_block_tensor_tmp,
+                                   const BBlockWindowTmp& b_block_window_tmp) const
+    {
+        static_assert(
+            std::is_same_v<ADataType, remove_cv_t<typename ABlockTensorTmp::DataType>> &&
+                std::is_same_v<BDataType, remove_cv_t<typename BBlockWindowTmp::DataType>> &&
+                std::is_same_v<CDataType, remove_cv_t<typename CBlockTensor::DataType>>,
+            "wrong!");
+
+        constexpr index_t MPerBlock = ABlockTensorTmp{}.get_lengths()[number<0>{}];
+        constexpr index_t NPerBlock = BBlockWindowTmp{}.get_window_lengths()[number<0>{}];
+        constexpr index_t KPerBlock = ABlockTensorTmp{}.get_lengths()[number<1>{}];
+
+        static_assert(MPerBlock == BlockGemmShape::kM && NPerBlock == BlockGemmShape::kN &&
+                          KPerBlock == BlockGemmShape::kK,
+                      "wrong!");
+
+        constexpr auto config = Policy::template GetWarpGemmMWarpNWarp<Problem>();
+
+        using WG = remove_cvref_t<decltype(config.template at<0>())>;
+
+        constexpr index_t MWarp = config.template at<1>();
+        constexpr index_t NWarp = config.template at<2>();
+
+        constexpr index_t MIterPerWarp = MPerBlock / (MWarp * WG::kM);
+        constexpr index_t NIterPerWarp = NPerBlock / (NWarp * WG::kN);
+        constexpr index_t KIterPerWarp = KPerBlock / WG::kK;
+
+        constexpr index_t NPerBlockPerIter = NPerBlock / NIterPerWarp;
+        constexpr index_t KPerBlockPerIter = KPerBlock / KIterPerWarp;
+
+        const index_t iNWarp = get_warp_id() % NWarp;
+
+        constexpr auto a_block_outer_dstr_encoding =
+            tile_distribution_encoding<sequence<NWarp>,
+                                       tuple<sequence<MIterPerWarp, MWarp>, sequence<KIterPerWarp>>,
+                                       tuple<sequence<1, 0>>,
+                                       tuple<sequence<1, 0>>,
+                                       sequence<1, 2>,
+                                       sequence<0, 0>>{};
+
+        constexpr auto c_block_outer_dstr_encoding = tile_distribution_encoding<
+            sequence<>,
+            tuple<sequence<MIterPerWarp, MWarp>, sequence<NIterPerWarp, NWarp>>,
+            tuple<sequence<1, 2>>,
+            tuple<sequence<1, 1>>,
+            sequence<1, 2>,
+            sequence<0, 0>>{};
+
+        constexpr auto a_block_dstr_encode = detail::make_embed_tile_distribution_encoding(
+            a_block_outer_dstr_encoding, typename WG::AWarpDstrEncoding{});
+
+        constexpr auto c_block_dstr_encode = detail::make_embed_tile_distribution_encoding(
+            c_block_outer_dstr_encoding, typename WG::CWarpDstrEncoding{});
+
+        constexpr auto a_block_dstr = make_static_tile_distribution(a_block_dstr_encode);
+
+        // constrcut from A-block-tensor from A-Block-tensor-tmp
+        // FIXME: need method to check a_block_tensor and a_block_tensor_tmp have equivalent
+        // distribution
+        auto a_block_tensor =
+            make_static_distributed_tensor<typename ABlockTensorTmp::DataType>(a_block_dstr);
+
+        a_block_tensor.get_thread_buffer() = a_block_tensor_tmp.get_thread_buffer();
+
+        // construct B-warp-window
+        auto b_warp_window_tmp = make_tile_window(
+            b_block_window_tmp.get_bottom_tensor_view(),
+            make_tuple(number<WG::kN>{}, number<WG::kK>{}),
+            b_block_window_tmp.get_window_origin() + multi_index<2>{iNWarp * WG::kN, 0},
+            make_static_tile_distribution(typename WG::BWarpDstrEncoding{}));
+
+#if 0 // FIXME: using array will cause register spill
+        array<array<decltype(b_warp_window_tmp), KIterPerWarp>, NIterPerWarp> b_warp_windows{
+            {b_warp_window_tmp}};
+
+        for(index_t nIter = 0; nIter < NIterPerWarp; nIter++)
+        {
+            for(index_t kIter = 0; kIter < KIterPerWarp; kIter++)
+            {
+                move_tile_window(b_warp_windows(nIter)(kIter),
+                                 {nIter * NPerBlockPerIter, kIter * KPerBlockPerIter});
+            }
+        }
+#else
+        statically_indexed_array<
+            statically_indexed_array<decltype(b_warp_window_tmp), KIterPerWarp>,
+            NIterPerWarp>
+            b_warp_windows;
+
+        static_for<0, NIterPerWarp, 1>{}([&](auto nIter) {
+            static_for<0, KIterPerWarp, 1>{}([&](auto kIter) {
+                b_warp_windows(nIter)(kIter) = b_warp_window_tmp;
+
+                move_tile_window(b_warp_windows(nIter)(kIter),
+                                 {nIter * NPerBlockPerIter, kIter * KPerBlockPerIter});
+            });
+        });
+#endif
+
+        // check C-block-distribution
+        static_assert(
+            std::is_same_v<remove_cvref_t<decltype(c_block_dstr_encode)>,
+                           remove_cvref_t<decltype(CBlockTensor::get_tile_distribution()
+                                                       .get_static_tile_distribution_encoding())>>,
+            "wrong!");
+
+        using AWarpDstr = typename WG::AWarpDstr;
+        using CWarpDstr = typename WG::CWarpDstr;
+
+        using AWarpTensor = typename WG::AWarpTensor;
+        using CWarpTensor = typename WG::CWarpTensor;
+
+        constexpr auto a_warp_y_lengths =
+            to_sequence(AWarpDstr{}.get_ys_to_d_descriptor().get_lengths());
+        constexpr auto c_warp_y_lengths =
+            to_sequence(CWarpDstr{}.get_ys_to_d_descriptor().get_lengths());
+
+        constexpr auto a_warp_y_index_zeros = uniform_sequence_gen_t<AWarpDstr::NDimY, 0>{};
+        constexpr auto c_warp_y_index_zeros = uniform_sequence_gen_t<CWarpDstr::NDimY, 0>{};
+
+        // hot loop:
+        static_for<0, KIterPerWarp, 1>{}([&](auto kIter) {
+            static_for<0, MIterPerWarp, 1>{}([&](auto mIter) {
+                // read A warp tensor from A block tensor
+                AWarpTensor a_warp_tensor;
+
+                a_warp_tensor.get_thread_buffer() = a_block_tensor.get_y_sliced_thread_data(
+                    merge_sequences(sequence<mIter, kIter>{}, a_warp_y_index_zeros),
+                    merge_sequences(sequence<1, 1>{}, a_warp_y_lengths));
+
+                static_for<0, NIterPerWarp, 1>{}([&](auto nIter) {
+                    // read B warp tensor from B Block window
+                    const auto b_warp_tensor = load_tile(b_warp_windows(nIter)(kIter));
+
+                    // read C warp tensor from C block tensor
+                    CWarpTensor c_warp_tensor;
+
+                    c_warp_tensor.get_thread_buffer() = c_block_tensor.get_y_sliced_thread_data(
+                        merge_sequences(sequence<mIter, nIter>{}, c_warp_y_index_zeros),
+                        merge_sequences(sequence<1, 1>{}, c_warp_y_lengths));
+
+                    // warp GEMM
+                    WG{}(c_warp_tensor, a_warp_tensor, b_warp_tensor);
+
+                    // write C warp tensor into C block tensor
+                    c_block_tensor.set_y_sliced_thread_data(
+                        merge_sequences(sequence<mIter, nIter>{}, c_warp_y_index_zeros),
+                        merge_sequences(sequence<1, 1>{}, c_warp_y_lengths),
+                        c_warp_tensor.get_thread_buffer());
+                });
+            });
+        });
+    }
+
+    // C = A * B
+    template <typename ABlockTensorTmp, typename BBlockWindowTmp>
+    CK_TILE_DEVICE auto operator()(const ABlockTensorTmp& a_block_tensor_tmp,
+                                   const BBlockWindowTmp& b_block_window_tmp) const
+    {
+        static_assert(
+            std::is_same_v<ADataType, remove_cv_t<typename ABlockTensorTmp::DataType>> &&
+                std::is_same_v<BDataType, remove_cv_t<typename BBlockWindowTmp::DataType>>,
+            "wrong!");
+
+        constexpr index_t MPerBlock = ABlockTensorTmp{}.get_lengths()[number<0>{}];
+        constexpr index_t NPerBlock = BBlockWindowTmp{}.get_window_lengths()[number<0>{}];
+        constexpr index_t KPerBlock = ABlockTensorTmp{}.get_lengths()[number<1>{}];
+
+        static_assert(MPerBlock == BlockGemmShape::kM && NPerBlock == BlockGemmShape::kN &&
+                          KPerBlock == BlockGemmShape::kK,
+                      "wrong!");
+
+        constexpr auto config = Policy::template GetWarpGemmMWarpNWarp<Problem>();
+
+        using WG = remove_cvref_t<decltype(config.template at<0>())>;
+
+        constexpr index_t MWarp = config.template at<1>();
+        constexpr index_t NWarp = config.template at<2>();
+
+        constexpr index_t MIterPerWarp = MPerBlock / (MWarp * WG::kM);
+        constexpr index_t NIterPerWarp = NPerBlock / (NWarp * WG::kN);
+        constexpr index_t KIterPerWarp = KPerBlock / WG::kK;
+
+        constexpr index_t NPerBlockPerIter = NPerBlock / NIterPerWarp;
+        constexpr index_t KPerBlockPerIter = KPerBlock / KIterPerWarp;
+
+        const index_t iNWarp = get_warp_id() % NWarp;
+
+        constexpr auto a_block_outer_dstr_encoding =
+            tile_distribution_encoding<sequence<NWarp>,
+                                       tuple<sequence<MIterPerWarp, MWarp>, sequence<KIterPerWarp>>,
+                                       tuple<sequence<1, 0>>,
+                                       tuple<sequence<1, 0>>,
+                                       sequence<1, 2>,
+                                       sequence<0, 0>>{};
+
+        constexpr auto c_block_outer_dstr_encoding = tile_distribution_encoding<
+            sequence<>,
+            tuple<sequence<MIterPerWarp, MWarp>, sequence<NIterPerWarp, NWarp>>,
+            tuple<sequence<1, 2>>,
+            tuple<sequence<1, 1>>,
+            sequence<1, 2>,
+            sequence<0, 0>>{};
+
+        constexpr auto a_block_dstr_encode = detail::make_embed_tile_distribution_encoding(
+            a_block_outer_dstr_encoding, typename WG::AWarpDstrEncoding{});
+
+        constexpr auto c_block_dstr_encode = detail::make_embed_tile_distribution_encoding(
+            c_block_outer_dstr_encoding, typename WG::CWarpDstrEncoding{});
+
+        constexpr auto a_block_dstr = make_static_tile_distribution(a_block_dstr_encode);
+        constexpr auto c_block_dstr = make_static_tile_distribution(c_block_dstr_encode);
+
+        // constrcut from A-block-tensor from A-Block-tensor-tmp
+        // FIXME: need method to check a_block_tensor and a_block_tensor_tmp have equivalent
+        // distribution
+        auto a_block_tensor =
+            make_static_distributed_tensor<typename ABlockTensorTmp::DataType>(a_block_dstr);
+
+        a_block_tensor.get_thread_buffer() = a_block_tensor_tmp.get_thread_buffer();
+
+        // construct B-warp-window
+        auto b_warp_window_tmp = make_tile_window(
+            b_block_window_tmp.get_bottom_tensor_view(),
+            make_tuple(number<WG::kN>{}, number<WG::kK>{}),
+            b_block_window_tmp.get_window_origin() + multi_index<2>{iNWarp * WG::kN, 0},
+            make_static_tile_distribution(typename WG::BWarpDstrEncoding{}));
+
+#if 0 // FIXME: using array will cause register spill
+        array<array<decltype(b_warp_window_tmp), KIterPerWarp>, NIterPerWarp> b_warp_windows{
+            {b_warp_window_tmp}};
+
+        for(index_t nIter = 0; nIter < NIterPerWarp; nIter++)
+        {
+            for(index_t kIter = 0; kIter < KIterPerWarp; kIter++)
+            {
+                move_tile_window(b_warp_windows(nIter)(kIter),
+                                 {nIter * NPerBlockPerIter, kIter * KPerBlockPerIter});
+            }
+        }
+#else
+        statically_indexed_array<
+            statically_indexed_array<decltype(b_warp_window_tmp), KIterPerWarp>,
+            NIterPerWarp>
+            b_warp_windows;
+
+        static_for<0, NIterPerWarp, 1>{}([&](auto nIter) {
+            static_for<0, KIterPerWarp, 1>{}([&](auto kIter) {
+                b_warp_windows(nIter)(kIter) = b_warp_window_tmp;
+
+                move_tile_window(b_warp_windows(nIter)(kIter),
+                                 {nIter * NPerBlockPerIter, kIter * KPerBlockPerIter});
+            });
+        });
+#endif
+
+        // Construct C-Block-HostTensor
+        auto c_block_tensor = make_static_distributed_tensor<CDataType>(c_block_dstr);
+
+        using AWarpDstr = typename WG::AWarpDstr;
+        using CWarpDstr = typename WG::CWarpDstr;
+
+        using AWarpTensor = typename WG::AWarpTensor;
+        using CWarpTensor = typename WG::CWarpTensor;
+
+        constexpr auto a_warp_y_lengths =
+            to_sequence(AWarpDstr{}.get_ys_to_d_descriptor().get_lengths());
+        constexpr auto c_warp_y_lengths =
+            to_sequence(CWarpDstr{}.get_ys_to_d_descriptor().get_lengths());
+
+        constexpr auto a_warp_y_index_zeros = uniform_sequence_gen_t<AWarpDstr::NDimY, 0>{};
+        constexpr auto c_warp_y_index_zeros = uniform_sequence_gen_t<CWarpDstr::NDimY, 0>{};
+
+        // hot loop:
+        static_for<0, KIterPerWarp, 1>{}([&](auto kIter) {
+            static_for<0, MIterPerWarp, 1>{}([&](auto mIter) {
+                // read A warp tensor from A block tensor
+                AWarpTensor a_warp_tensor;
+
+                a_warp_tensor.get_thread_buffer() = a_block_tensor.get_y_sliced_thread_data(
+                    merge_sequences(sequence<mIter, kIter>{}, a_warp_y_index_zeros),
+                    merge_sequences(sequence<1, 1>{}, a_warp_y_lengths));
+
+                static_for<0, NIterPerWarp, 1>{}([&](auto nIter) {
+                    // read B warp tensor from B Block window
+                    const auto b_warp_tensor = load_tile(b_warp_windows(nIter)(kIter));
+
+                    // read C warp tensor from C block tensor
+                    CWarpTensor c_warp_tensor;
+
+                    c_warp_tensor.get_thread_buffer() = c_block_tensor.get_y_sliced_thread_data(
+                        merge_sequences(sequence<mIter, nIter>{}, c_warp_y_index_zeros),
+                        merge_sequences(sequence<1, 1>{}, c_warp_y_lengths));
+
+                    // warp GEMM
+                    WG{}(c_warp_tensor, a_warp_tensor, b_warp_tensor);
+
+                    // write C warp tensor into C block tensor
+                    c_block_tensor.set_y_sliced_thread_data(
+                        merge_sequences(sequence<mIter, nIter>{}, c_warp_y_index_zeros),
+                        merge_sequences(sequence<1, 1>{}, c_warp_y_lengths),
+                        c_warp_tensor.get_thread_buffer());
+                });
+            });
+        });
+
+        return c_block_tensor;
+    }
+};
+
+} // namespace ck_tile

include/ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v1_custom_policy.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+
+namespace ck_tile {
+
+template <typename AType_,
+          typename BType_,
+          typename CType_,
+          typename BlockWarps_,
+          typename WarpGemm_>
+struct BlockGemmARegBSmemCRegV1CustomPolicy
+{
+    using AType = remove_cvref_t<AType_>;
+    using BType = remove_cvref_t<BType_>;
+    using CType = remove_cvref_t<CType_>;
+
+    using BlockWarps = remove_cvref_t<BlockWarps_>;
+
+    static constexpr index_t kMWarps = BlockWarps::at(number<0>{});
+    static constexpr index_t kNWarps = BlockWarps::at(number<1>{});
+    static constexpr index_t kKWarps = BlockWarps::at(number<2>{});
+
+    using WarpGemm = remove_cvref_t<WarpGemm_>;
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetWarpGemmMWarpNWarp()
+    {
+        return make_tuple(WarpGemm{}, kMWarps, kNWarps);
+    }
+};
+
+} // namespace ck_tile

include/ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v1_default_policy.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/gemm/warp/warp_gemm.hpp"
+
+namespace ck_tile {
+
+// Default policy for BlockGemmARegBSmemCRegV1
+// Default policy class should not be templated, put template on member functions instead
+struct BlockGemmARegBSmemCRegV1DefaultPolicy
+{
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetWarpGemmMWarpNWarp()
+    {
+        if constexpr(std::is_same_v<typename Problem::ADataType, half_t> &&
+                     std::is_same_v<typename Problem::BDataType, half_t> &&
+                     std::is_same_v<typename Problem::CDataType, float>)
+        {
+#if 0
+            constexpr index_t kBlockSize = Problem::kBlockSize;
+
+            constexpr index_t kMPerBlock = Problem::BlockGemmShape::kM;
+            constexpr index_t kNPerBlock = Problem::BlockGemmShape::kN;
+            constexpr index_t kKPerBlock = Problem::BlockGemmShape::kK;
+
+            static_assert(kBlockSize % get_warp_size() == 0, "wrong!");
+
+            constexpr index_t NumWarp = kBlockSize / get_warp_size();
+
+            // FIXME
+            if constexpr(NumWarp == 4 && kMPerBlock % 128 == 0 &&
+                         kNPerBlock % 128 == 0 % kKPerBlock % 16 == 0)
+            {
+                return make_tuple(WarpGemmMfmaF16F16F32M32N32K8{}, 4, 1);
+            }
+            else
+            {
+                return make_tuple(WarpGemmMfmaF16F16F32M32N32K8{}, 4, 1);
+            }
+#else
+            return make_tuple(WarpGemmMfmaF16F16F32M32N32K8TransposedCDistribution{}, 4, 1);
+#endif
+        }
+        else if constexpr(std::is_same_v<typename Problem::ADataType, bf16_t> &&
+                          std::is_same_v<typename Problem::BDataType, bf16_t> &&
+                          std::is_same_v<typename Problem::CDataType, float>)
+        {
+            return make_tuple(WarpGemmMfmaBf16Bf16F32M32N32K8TransposedCDistribution{}, 4, 1);
+        }
+    }
+};
+
+} // namespace ck_tile

include/ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v2.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+#include "ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v2_default_policy.hpp"
+
+namespace ck_tile {
+
+// A is block distributed tensor
+// B is block window on shared memory
+// C is block distributed tensor
+template <typename Problem_, typename Policy_ = BlockGemmARegBSmemCRegV2DefaultPolicy>
+struct BlockGemmARegBSmemCRegV2
+{
+    using Problem        = remove_cvref_t<Problem_>;
+    using Policy         = remove_cvref_t<Policy_>;
+    using ADataType      = remove_cvref_t<typename Problem::ADataType>;
+    using BDataType      = remove_cvref_t<typename Problem::BDataType>;
+    using CDataType      = remove_cvref_t<typename Problem::CDataType>;
+    using BlockGemmShape = remove_cvref_t<typename Problem::BlockGemmShape>;
+
+    static constexpr index_t kBlockSize = Problem::kBlockSize;
+
+    // C += A * B
+    template <typename CBlockTensor, typename ABlockTensorTmp, typename BBlockWindowTmp>
+    CK_TILE_DEVICE void operator()(CBlockTensor& c_block_tensor,
+                                   const ABlockTensorTmp& a_block_tensor_tmp,
+                                   const BBlockWindowTmp& b_block_window_tmp) const
+    {
+        static_assert(
+            std::is_same_v<ADataType, remove_cv_t<typename ABlockTensorTmp::DataType>> &&
+                std::is_same_v<BDataType, remove_cv_t<typename BBlockWindowTmp::DataType>> &&
+                std::is_same_v<CDataType, remove_cv_t<typename CBlockTensor::DataType>>,
+            "wrong!");
+
+        constexpr index_t MPerBlock = ABlockTensorTmp{}.get_lengths()[number<0>{}];
+        constexpr index_t NPerBlock = BBlockWindowTmp{}.get_window_lengths()[number<0>{}];
+        constexpr index_t KPerBlock = ABlockTensorTmp{}.get_lengths()[number<1>{}];
+
+        static_assert(MPerBlock == BlockGemmShape::kM && NPerBlock == BlockGemmShape::kN &&
+                          KPerBlock == BlockGemmShape::kK,
+                      "wrong!");
+
+        constexpr auto config = Policy::template GetWarpGemmMWarpNWarp<Problem>();
+
+        using WG = remove_cvref_t<decltype(config.template at<0>())>;
+
+        constexpr index_t MWarp = config.template at<1>();
+        constexpr index_t NWarp = config.template at<2>();
+
+        constexpr index_t MIterPerWarp = MPerBlock / (MWarp * WG::kM);
+        constexpr index_t NIterPerWarp = NPerBlock / (NWarp * WG::kN);
+        constexpr index_t KIterPerWarp = KPerBlock / WG::kK;
+
+        constexpr index_t NPerBlockPerIter = NPerBlock / NIterPerWarp;
+        constexpr index_t KPerBlockPerIter = KPerBlock / KIterPerWarp;
+
+        const index_t iNWarp = get_warp_id() % NWarp;
+
+        constexpr auto a_block_outer_dstr_encoding =
+            tile_distribution_encoding<sequence<NWarp>,
+                                       tuple<sequence<MIterPerWarp, MWarp>, sequence<KIterPerWarp>>,
+                                       tuple<sequence<1, 0>>,
+                                       tuple<sequence<1, 0>>,
+                                       sequence<1, 2>,
+                                       sequence<0, 0>>{};
+
+        constexpr auto c_block_outer_dstr_encoding = tile_distribution_encoding<
+            sequence<>,
+            tuple<sequence<MIterPerWarp, MWarp>, sequence<NIterPerWarp, NWarp>>,
+            tuple<sequence<1, 2>>,
+            tuple<sequence<1, 1>>,
+            sequence<1, 2>,
+            sequence<0, 0>>{};
+
+        constexpr auto a_block_dstr_encode = detail::make_embed_tile_distribution_encoding(
+            a_block_outer_dstr_encoding, typename WG::AWarpDstrEncoding{});
+
+        constexpr auto c_block_dstr_encode = detail::make_embed_tile_distribution_encoding(
+            c_block_outer_dstr_encoding, typename WG::CWarpDstrEncoding{});
+
+        constexpr auto a_block_dstr = make_static_tile_distribution(a_block_dstr_encode);
+
+        // constrcut from A-block-tensor from A-Block-tensor-tmp
+        // FIXME: need method to check a_block_tensor and a_block_tensor_tmp have equivalent
+        // distribution
+        auto a_block_tensor =
+            make_static_distributed_tensor<typename ABlockTensorTmp::DataType>(a_block_dstr);
+
+        a_block_tensor.get_thread_buffer() = a_block_tensor_tmp.get_thread_buffer();
+
+        // construct B-warp-window
+        auto b_warp_window_tmp = make_tile_window(
+            b_block_window_tmp.get_bottom_tensor_view(),
+            make_tuple(number<WG::kN>{}, number<WG::kK>{}),
+            b_block_window_tmp.get_window_origin() + multi_index<2>{iNWarp * WG::kN, 0},
+            make_static_tile_distribution(typename WG::BWarpDstrEncoding{}));
+
+#if 0 // FIXME: using array will cause register spill
+        array<array<decltype(b_warp_window_tmp), KIterPerWarp>, NIterPerWarp> b_warp_windows{
+            {b_warp_window_tmp}};
+
+        for(index_t nIter = 0; nIter < NIterPerWarp; nIter++)
+        {
+            for(index_t kIter = 0; kIter < KIterPerWarp; kIter++)
+            {
+                move_tile_window(b_warp_windows(nIter)(kIter),
+                                 {nIter * NPerBlockPerIter, kIter * KPerBlockPerIter});
+            }
+        }
+#else
+        statically_indexed_array<
+            statically_indexed_array<decltype(b_warp_window_tmp), KIterPerWarp>,
+            NIterPerWarp>
+            b_warp_windows;
+
+        static_for<0, NIterPerWarp, 1>{}([&](auto nIter) {
+            static_for<0, KIterPerWarp, 1>{}([&](auto kIter) {
+                b_warp_windows(nIter)(kIter) = b_warp_window_tmp;
+
+                move_tile_window(b_warp_windows(nIter)(kIter),
+                                 {nIter * NPerBlockPerIter, kIter * KPerBlockPerIter});
+            });
+        });
+#endif
+
+        // check C-block-distribution
+        static_assert(
+            std::is_same_v<remove_cvref_t<decltype(c_block_dstr_encode)>,
+                           remove_cvref_t<decltype(CBlockTensor::get_tile_distribution()
+                                                       .get_static_tile_distribution_encoding())>>,
+            "wrong!");
+
+        using AWarpDstr = typename WG::AWarpDstr;
+        using CWarpDstr = typename WG::CWarpDstr;
+
+        using AWarpTensor = typename WG::AWarpTensor;
+        using CWarpTensor = typename WG::CWarpTensor;
+
+        constexpr auto a_warp_y_lengths =
+            to_sequence(AWarpDstr{}.get_ys_to_d_descriptor().get_lengths());
+        constexpr auto c_warp_y_lengths =
+            to_sequence(CWarpDstr{}.get_ys_to_d_descriptor().get_lengths());
+
+        constexpr auto a_warp_y_index_zeros = uniform_sequence_gen_t<AWarpDstr::NDimY, 0>{};
+        constexpr auto c_warp_y_index_zeros = uniform_sequence_gen_t<CWarpDstr::NDimY, 0>{};
+
+        // hot loop:
+        static_for<0, KIterPerWarp, 1>{}([&](auto kIter) {
+            static_for<0, NIterPerWarp, 1>{}([&](auto nIter) {
+                // read B warp tensor from B Block window
+                const auto b_warp_tensor = load_tile(b_warp_windows(nIter)(kIter));
+
+                static_for<0, MIterPerWarp, 1>{}([&](auto mIter) {
+                    // read A warp tensor from A block tensor
+                    AWarpTensor a_warp_tensor;
+
+                    a_warp_tensor.get_thread_buffer() = a_block_tensor.get_y_sliced_thread_data(
+                        merge_sequences(sequence<mIter, kIter>{}, a_warp_y_index_zeros),
+                        merge_sequences(sequence<1, 1>{}, a_warp_y_lengths));
+
+                    // read C warp tensor from C block tensor
+                    CWarpTensor c_warp_tensor;
+
+                    c_warp_tensor.get_thread_buffer() = c_block_tensor.get_y_sliced_thread_data(
+                        merge_sequences(sequence<mIter, nIter>{}, c_warp_y_index_zeros),
+                        merge_sequences(sequence<1, 1>{}, c_warp_y_lengths));
+
+                    // warp GEMM
+                    WG{}(c_warp_tensor, a_warp_tensor, b_warp_tensor);
+                    // WG{}(c_warp_tensor, a_warp_tensor, b_warp_tensor_array[nIter]);
+
+                    // write C warp tensor into C block tensor
+                    c_block_tensor.set_y_sliced_thread_data(
+                        merge_sequences(sequence<mIter, nIter>{}, c_warp_y_index_zeros),
+                        merge_sequences(sequence<1, 1>{}, c_warp_y_lengths),
+                        c_warp_tensor.get_thread_buffer());
+                });
+            });
+        });
+    }
+
+    CK_TILE_DEVICE constexpr auto MakeCBlockTile() const
+    {
+        constexpr index_t MPerBlock = BlockGemmShape::kM;
+        constexpr index_t NPerBlock = BlockGemmShape::kN;
+
+        constexpr auto config = Policy::template GetWarpGemmMWarpNWarp<Problem>();
+
+        using WG = remove_cvref_t<decltype(config.template at<0>())>;
+
+        constexpr index_t MWarp = config.template at<1>();
+        constexpr index_t NWarp = config.template at<2>();
+
+        constexpr index_t MIterPerWarp = MPerBlock / (MWarp * WG::kM);
+        constexpr index_t NIterPerWarp = NPerBlock / (NWarp * WG::kN);
+        // constexpr index_t KIterPerWarp = KPerBlock / WG::kK;
+
+        constexpr auto c_block_outer_dstr_encoding = tile_distribution_encoding<
+            sequence<>,
+            tuple<sequence<MIterPerWarp, MWarp>, sequence<NIterPerWarp, NWarp>>,
+            tuple<sequence<1, 2>>,
+            tuple<sequence<1, 1>>,
+            sequence<1, 2>,
+            sequence<0, 0>>{};
+
+        constexpr auto c_block_dstr_encode = detail::make_embed_tile_distribution_encoding(
+            c_block_outer_dstr_encoding, typename WG::CWarpDstrEncoding{});
+        constexpr auto c_block_dstr = make_static_tile_distribution(c_block_dstr_encode);
+        auto c_block_tensor         = make_static_distributed_tensor<CDataType>(c_block_dstr);
+        return c_block_tensor;
+    }
+
+    // C = A * B
+    template <typename ABlockTensorTmp, typename BBlockWindowTmp>
+    CK_TILE_DEVICE auto operator()(const ABlockTensorTmp& a_block_tensor_tmp,
+                                   const BBlockWindowTmp& b_block_window_tmp) const
+    {
+        auto c_block_tensor = MakeCBlockTile();
+        operator()(c_block_tensor, a_block_tensor_tmp, b_block_window_tmp);
+        return c_block_tensor;
+    }
+};
+
+} // namespace ck_tile

include/ck_tile/ops/gemm/block/block_gemm_areg_bsmem_creg_v2_custom_policy.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include "ck_tile/core.hpp"
+
+namespace ck_tile {
+
+template <typename AType_,
+          typename BType_,
+          typename CType_,
+          typename BlockWarps_,
+          typename WarpGemm_>
+struct BlockGemmARegBSmemCRegV2CustomPolicy
+{
+    using AType = remove_cvref_t<AType_>;
+    using BType = remove_cvref_t<BType_>;
+    using CType = remove_cvref_t<CType_>;
+
+    using BlockWarps = remove_cvref_t<BlockWarps_>;
+
+    static constexpr index_t kMWarps = BlockWarps::at(number<0>{});
+    static constexpr index_t kNWarps = BlockWarps::at(number<1>{});
+    static constexpr index_t kKWarps = BlockWarps::at(number<2>{});
+
+    using WarpGemm = remove_cvref_t<WarpGemm_>;
+
+    template <typename Problem>
+    CK_TILE_HOST_DEVICE static constexpr auto GetWarpGemmMWarpNWarp()
+    {
+        return make_tuple(WarpGemm{}, kMWarps, kNWarps);
+    }
+};
+
+} // namespace ck_tile