// SPDX-License-Identifier: MIT
// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.

#pragma once

#include <iostream>
#include <sstream>

#include "ck/utility/common_header.hpp"
#include "ck/utility/philox_rand.hpp"
#include "ck/tensor_description/tensor_descriptor.hpp"
#include "ck/tensor_description/tensor_descriptor_helper.hpp"
#include "ck/tensor_operation/gpu/device/device_base.hpp"
#include "ck/tensor_operation/gpu/device/gemm_specialization.hpp"
#include "ck/tensor_operation/gpu/device/masking_specialization.hpp"
#include "ck/tensor_operation/gpu/device/matrix_padder.hpp"
#include "ck/tensor_operation/gpu/device/tensor_layout.hpp"
#include "ck/tensor_operation/gpu/grid/gridwise_batched_multihead_attention_backward_xdl_cshuffle_pt7.hpp"
#include "ck/tensor_operation/operator_transform/transform_contraction_to_gemm.hpp"
#include "ck/host_utility/device_prop.hpp"
#include "ck/host_utility/kernel_launch.hpp"

#include "ck/library/utility/host_tensor.hpp"

namespace ck {
namespace tensor_operation {
namespace device {

template <typename GridwiseGemm,
          typename InputDataType,
          typename OutputDataType,
          typename ZDataType,
          typename LSEDataType,
          typename AElementwiseOperation,
          typename BElementwiseOperation,
          typename AccElementwiseOperation,
          typename B1ElementwiseOperation,
          typename CElementwiseOperation,
          typename AGridDesc_AK0_M_AK1,
          typename BGridDesc_BK0_N_BK1,
          typename ZGridDescriptor_M0_N0_M1_N1_M2_N2_M3_N3_N4_N5,
          typename B1GridDesc_BK0_N_BK1,
          typename YGridDescriptor_MBlock_MPerBlock_OBlock_OPerBlock,
          typename LSEGridDescriptor_M,
          typename YGradGridDesc_M0_O_M1,
          typename Block2CTileMap,
          typename ComputeBasePtrOfStridedBatch,
          typename C0MatrixMask,
          bool HasMainKBlockLoop,
          bool Deterministic>
__global__ void
#if CK_USE_LAUNCH_BOUNDS
    __launch_bounds__(CK_MAX_THREAD_PER_BLOCK, /*CK_MIN_BLOCK_PER_CU*/ 1)
#endif
        kernel_batched_multihead_attention_backward_xdl_cshuffle_v2(
            const InputDataType* __restrict__ p_a_grid,
            const InputDataType* __restrict__ p_b_grid,
            ZDataType* __restrict__ p_z_grid,
            const InputDataType* __restrict__ p_b1_grid,
            const InputDataType* __restrict__ p_c_grid,
            const LSEDataType* __restrict__ p_lse_grid,
            const InputDataType* __restrict__ p_ygrad_grid,
            OutputDataType* __restrict__ p_qgrad_grid,
            OutputDataType* __restrict__ p_kgrad_grid,
            OutputDataType* __restrict__ p_vgrad_grid,
            const AElementwiseOperation a_element_op,
            const BElementwiseOperation b_element_op,
            const AccElementwiseOperation acc_element_op,
            const B1ElementwiseOperation b1_element_op,
            const CElementwiseOperation c_element_op,
            const AGridDesc_AK0_M_AK1 a_grid_desc_ak0_m_ak1,
            const BGridDesc_BK0_N_BK1 b_grid_desc_bk0_n_bk1,
            const ZGridDescriptor_M0_N0_M1_N1_M2_N2_M3_N3_N4_N5
                c_grid_desc_m0_n0_m1_n1_m2_n2_m3_n3_n4_n5,
            const B1GridDesc_BK0_N_BK1 b1_grid_desc_bk0_n_bk1,
            const YGridDescriptor_MBlock_MPerBlock_OBlock_OPerBlock
                c_grid_desc_mblock_mperblock_nblock_nperblock,
            const LSEGridDescriptor_M lse_grid_desc_m,
            const YGradGridDesc_M0_O_M1 ygrad_grid_desc_m0_o_m1,
            const Block2CTileMap block_2_ctile_map,
            const index_t batch_count,
            const index_t nblock,
            const ComputeBasePtrOfStridedBatch compute_base_ptr_of_batch,
            const C0MatrixMask c0_matrix_mask,
            const float p_drop,
            const unsigned long long seed,
            const unsigned long long offset)
{
#if(!defined(__HIP_DEVICE_COMPILE__) || defined(__gfx908__) || defined(__gfx90a__))
    __shared__ char p_shared[GridwiseGemm::GetSharedMemoryNumberOfByte()];
    const index_t num_blocks_per_batch =
        __builtin_amdgcn_readfirstlane(get_grid_size() / batch_count);
    const index_t g_idx = __builtin_amdgcn_readfirstlane(get_block_1d_id() / num_blocks_per_batch);

    // NOTE: assumes QKVY has the same layout as dQ/dK/dV/dY therefore being able to reuse batch
    // offsets
    const long_index_t a_batch_offset = __builtin_amdgcn_readfirstlane(
        static_cast<long_index_t>(compute_base_ptr_of_batch.GetABasePtr(g_idx)));
    const long_index_t b_batch_offset = __builtin_amdgcn_readfirstlane(
        static_cast<long_index_t>(compute_base_ptr_of_batch.GetBBasePtr(g_idx)));
    const long_index_t z_batch_offset = __builtin_amdgcn_readfirstlane(
        static_cast<long_index_t>(compute_base_ptr_of_batch.GetZBasePtr(g_idx)));
    const long_index_t b1_batch_offset = __builtin_amdgcn_readfirstlane(
        static_cast<long_index_t>(compute_base_ptr_of_batch.GetB1BasePtr(g_idx)));
    const long_index_t c_batch_offset = __builtin_amdgcn_readfirstlane(
        static_cast<long_index_t>(compute_base_ptr_of_batch.GetCBasePtr(g_idx)));
    const long_index_t lse_batch_offset = __builtin_amdgcn_readfirstlane(
        static_cast<long_index_t>(compute_base_ptr_of_batch.GetLSEBasePtr(g_idx)));

    const index_t global_thread_id = get_thread_global_1d_id();
    ck::philox ph(seed, global_thread_id, offset);
    ZDataType* z_matrix_ptr = (p_z_grid == nullptr ? nullptr : p_z_grid + z_batch_offset);

    if constexpr(Deterministic)
    {
        for(index_t i = 0; i < nblock; i++)
        {
            GridwiseGemm::template Run<HasMainKBlockLoop>(
                p_a_grid + a_batch_offset,
                p_b_grid + b_batch_offset,
                z_matrix_ptr,
                p_b1_grid + b1_batch_offset,
                p_c_grid + c_batch_offset,
                p_lse_grid + lse_batch_offset,
                p_ygrad_grid + c_batch_offset,
                p_qgrad_grid + a_batch_offset,
                p_kgrad_grid + b_batch_offset,
                p_vgrad_grid + b1_batch_offset,
                p_shared,
                a_element_op,
                b_element_op,
                acc_element_op,
                b1_element_op,
                c_element_op,
                a_grid_desc_ak0_m_ak1,
                b_grid_desc_bk0_n_bk1,
                c_grid_desc_m0_n0_m1_n1_m2_n2_m3_n3_n4_n5,
                b1_grid_desc_bk0_n_bk1,
                c_grid_desc_mblock_mperblock_nblock_nperblock,
                lse_grid_desc_m,
                ygrad_grid_desc_m0_o_m1,
                block_2_ctile_map,
                c0_matrix_mask,
                p_drop,
                ph,
                i);
        }
    }
    else
    {
        GridwiseGemm::template Run<HasMainKBlockLoop>(p_a_grid + a_batch_offset,
                                                      p_b_grid + b_batch_offset,
                                                      z_matrix_ptr,
                                                      p_b1_grid + b1_batch_offset,
                                                      p_c_grid + c_batch_offset,
                                                      p_lse_grid + lse_batch_offset,
                                                      p_ygrad_grid + c_batch_offset,
                                                      p_qgrad_grid + a_batch_offset,
                                                      p_kgrad_grid + b_batch_offset,
                                                      p_vgrad_grid + b1_batch_offset,
                                                      p_shared,
                                                      a_element_op,
                                                      b_element_op,
                                                      acc_element_op,
                                                      b1_element_op,
                                                      c_element_op,
                                                      a_grid_desc_ak0_m_ak1,
                                                      b_grid_desc_bk0_n_bk1,
                                                      c_grid_desc_m0_n0_m1_n1_m2_n2_m3_n3_n4_n5,
                                                      b1_grid_desc_bk0_n_bk1,
                                                      c_grid_desc_mblock_mperblock_nblock_nperblock,
                                                      lse_grid_desc_m,
                                                      ygrad_grid_desc_m0_o_m1,
                                                      block_2_ctile_map,
                                                      c0_matrix_mask,
                                                      p_drop,
                                                      ph,
                                                      0);
    }
#else
    ignore = p_a_grid;
    ignore = p_b_grid;
    ignore = p_b1_grid;
    ignore = p_c_grid;
    ignore = a_element_op;
    ignore = b_element_op;
    ignore = acc_element_op;
    ignore = b1_element_op;
    ignore = c_element_op;
    ignore = a_grid_desc_ak0_m_ak1;
    ignore = b_grid_desc_bk0_n_bk1;
    ignore = b1_grid_desc_bk0_n_bk1;
    ignore = c_grid_desc_mblock_mperblock_nblock_nperblock;
    ignore = block_2_ctile_map;
    ignore = batch_count;
    ignore = compute_base_ptr_of_batch;
    ignore = c0_matrix_mask;
    ignore = p_drop;
    ignore = seed;
    ignore = offset;
#endif // end of if (defined(__gfx908__) || defined(__gfx90a__))
}

// Computes C = A * B0 * B1
//              ^^^^^^ (Acc0)
//              ^^^^^^^^^^^ (Acc1)
template <index_t NumDimG,
          index_t NumDimM,
          index_t NumDimN,
          index_t NumDimK,
          index_t NumDimO, // NumDimGemm1N
          typename InputDataType,
          typename OutputDataType,
          typename GemmDataType,
          typename ZDataType,
          typename LSEDataType,
          typename Acc0BiasDataType,
          typename Acc1BiasDataType,
          typename GemmAccDataType,
          typename CShuffleDataType,
          typename AElementwiseOperation,
          typename BElementwiseOperation,
          typename AccElementwiseOperation,
          typename B1ElementwiseOperation,
          typename CElementwiseOperation,
          GemmSpecialization GemmSpec,
          TensorSpecialization ASpec,
          TensorSpecialization BSpec,
          TensorSpecialization B1Spec,
          TensorSpecialization CSpec,
          index_t NumGemmKPrefetchStage,
          index_t BlockSize,
          index_t MPerBlock,
          index_t NPerBlock, // Gemm0NPerBlock
          index_t KPerBlock, // Gemm0KPerBlock
          index_t Gemm1NPerBlock,
          index_t Gemm1KPerBlock,
          index_t AK1,
          index_t BK1,
          index_t B1K1,
          index_t MPerXDL,
          index_t NPerXDL,
          index_t MXdlPerWave,
          index_t NXdlPerWave,
          index_t Gemm1NXdlPerWave,
          index_t Gemm2NXdlPerWave,
          typename ABlockTransferThreadClusterLengths_AK0_M_AK1,
          typename ABlockTransferThreadClusterArrangeOrder,
          typename ABlockTransferSrcAccessOrder,
          index_t ABlockTransferSrcVectorDim,
          index_t ABlockTransferSrcScalarPerVector,
          index_t ABlockTransferDstScalarPerVector_AK1,
          bool ABlockLdsExtraM,
          typename BBlockTransferThreadClusterLengths_BK0_N_BK1,
          typename BBlockTransferThreadClusterArrangeOrder,
          typename BBlockTransferSrcAccessOrder,
          index_t BBlockTransferSrcVectorDim,
          index_t BBlockTransferSrcScalarPerVector,
          index_t BBlockTransferDstScalarPerVector_BK1,
          bool BBlockLdsExtraN,
          typename B1BlockTransferThreadClusterLengths_BK0_N_BK1,
          typename B1BlockTransferThreadClusterArrangeOrder,
          typename B1BlockTransferSrcAccessOrder,
          index_t B1BlockTransferSrcVectorDim,
          index_t B1BlockTransferSrcScalarPerVector,
          index_t B1BlockTransferDstScalarPerVector_BK1,
          bool B1BlockLdsExtraN,
          index_t CShuffleMXdlPerWavePerShuffle,
          index_t CShuffleNXdlPerWavePerShuffle,
          typename CShuffleBlockTransferClusterLengths_MBlock_MPerBlock_NBlock_NPerBlock,
          index_t CShuffleBlockTransferScalarPerVector_NPerBlock,
          MaskingSpecialization MaskingSpec,
          bool Deterministic,
          LoopScheduler LoopSched = LoopScheduler::Default>
struct DeviceBatchedMultiheadAttentionBackward_Xdl_CShuffle_V2
    : public BaseOperator // TODO inherit atten bwd op once API stablizes
{
    static_assert(NumDimG > 0 && NumDimM > 0 && NumDimN > 0 && NumDimK > 0 && NumDimO > 0,
                  "Number of dimension must be greater than 0");

    static constexpr index_t NumAcc0Bias = Acc0BiasDataType::Size();
    static constexpr index_t NumAcc1Bias = Acc1BiasDataType::Size();

    // TODO: implement bias combination
    static_assert(NumAcc0Bias == 0 && NumAcc0Bias == 0, "Bias addition is unimplemented");

    using DeviceOp = DeviceBatchedMultiheadAttentionBackward_Xdl_CShuffle_V2;

    static constexpr auto I0 = Number<0>{};
    static constexpr auto I1 = Number<1>{};
    static constexpr auto I2 = Number<2>{};

    static constexpr index_t Q_K1 = 8;
    static constexpr index_t K_K1 = 8;
    static constexpr index_t V_N1 = 2;

    static constexpr index_t Q_M1 = 2;
    static constexpr index_t K_N1 = 2;
    static constexpr index_t V_O1 = 8;
    static constexpr index_t Y_O1 = 8;
    static constexpr index_t Y_M1 = 2;

    static constexpr auto padder = GemmGemmPadder<GemmSpec,
                                                  Number<MPerBlock>,
                                                  Number<NPerBlock>,
                                                  Number<KPerBlock>,
                                                  Number<Gemm1NPerBlock>>{};

    using Transform = TransformBatchedContractionContractionToBatchedGemmGemm<
        Sequence<NumDimG, NumDimM, NumDimN, NumDimK, NumDimO>,
        Sequence<MPerBlock, NPerBlock, KPerBlock, Gemm1NPerBlock>,
        GemmSpec,
        ASpec,
        BSpec,
        B1Spec,
        CSpec>;

    /*
    Descriptors for inputs:

      Q, K, V, Y, dY, per-row softmax stats

    Descriptors for outputs:

      dQ, dK, dV

    */

    // Q in Gemm A position
    static auto MakeAGridDescriptor_AK0_M_AK1(const std::vector<index_t>& a_gs_ms_ks_lengths_vec,
                                              const std::vector<index_t>& a_gs_ms_ks_strides_vec)
    {
        return Transform::MakeAGridDescriptor_AK0_M_AK1(
            Transform::MakeAGridDescriptor_M_K(a_gs_ms_ks_lengths_vec, a_gs_ms_ks_strides_vec),
            Number<AK1>{});
    }

    // K in Gemm B0 position
    static auto MakeBGridDescriptor_BK0_N_BK1(const std::vector<index_t>& b_gs_ns_ks_lengths_vec,
                                              const std::vector<index_t>& b_gs_ns_ks_strides_vec)
    {
        return Transform::MakeB0GridDescriptor_BK0_N_BK1(
            Transform::MakeB0GridDescriptor_N_K(b_gs_ns_ks_lengths_vec, b_gs_ns_ks_strides_vec),
            Number<BK1>{});
    }

    // V in Gemm B1 position
    static auto
    MakeB1GridDescriptor_BK0_N_BK1(const std::vector<index_t>& b1_gs_gemm1ns_gemm1ks_lengths_vec,
                                   const std::vector<index_t>& b1_gs_gemm1ns_gemm1ks_strides_vec)
    {
        return Transform::MakeB1GridDescriptor_BK0_N_BK1(
            Transform::MakeB1GridDescriptor_N_K(b1_gs_gemm1ns_gemm1ks_lengths_vec,
                                                b1_gs_gemm1ns_gemm1ks_strides_vec),
            Number<B1K1>{});
    }

    //
    // dV = P^T * dY
    //

    // VGrad in Gemm C position
    static auto MakeVGradGridDescriptor_N_O(const std::vector<index_t>& v_gs_os_ns_lengths_vec,
                                            const std::vector<index_t>& v_gs_os_ns_strides_vec)
    {
        // v_gs_os_ns -> vgrad_gs_ns_os. O dims last because output is row-major.
        // Here directly rearrange lengths/strides before constructing tensor descriptor to reduce
        // transformation overhead
        // TODO: This will be much easier when inputs are Gs, Ms, Ns, Os. So there's no need to
        // extract subsequence and shuffle them.
        const index_t num_dims = NumDimG + NumDimN + NumDimO;

        // 0, 1, .. NumDimG - 1
        std::vector<index_t> gs_ids(NumDimG);
        std::iota(gs_ids.begin(), gs_ids.end(), 0);

        // NumDimG, NumDimG + 1, ... NumDimG + NumDimO - 1
        std::vector<index_t> os_ids(NumDimO);
        std::iota(os_ids.begin(), os_ids.end(), NumDimG);

        // NumDimG + NumDimO, NumDimG + NumDimO + 1, ... NumDimG + NumDimO + NumDimN - 1
        std::vector<index_t> ns_ids(NumDimN);
        std::iota(ns_ids.begin(), ns_ids.end(), NumDimG + NumDimO);

        std::vector<index_t> ids_old2new;
        ids_old2new.insert(ids_old2new.end(), gs_ids.begin(), gs_ids.end());
        ids_old2new.insert(ids_old2new.end(), ns_ids.begin(), ns_ids.end());
        ids_old2new.insert(ids_old2new.end(), os_ids.begin(), os_ids.end());

        std::vector<index_t> v_gs_ns_os_lengths_vec(num_dims), v_gs_ns_os_strides_vec(num_dims);
        for(int i = 0; i < num_dims; i++)
        {
            index_t id_new            = ids_old2new[i];
            v_gs_ns_os_lengths_vec[i] = v_gs_os_ns_lengths_vec[id_new];
            v_gs_ns_os_strides_vec[i] = v_gs_os_ns_strides_vec[id_new];
        }

        const auto vgrad_desc_nraw_oraw =
            MakeGridDescriptorPair<NumDimG, NumDimN, NumDimO, TensorSpecialization::Default>(
                v_gs_ns_os_lengths_vec, v_gs_ns_os_strides_vec)
                .second;

        return PadTensorDescriptor(vgrad_desc_nraw_oraw,
                                   make_tuple(NPerBlock, Gemm1NPerBlock),
                                   Sequence<padder.PadN, padder.PadO>{});
    }

    template <typename YGridDesc_M_O>
    static auto MakeYGradGridDescriptor_M0_O_M1(const YGridDesc_M_O& ygrad_grid_desc_m_o)
    {
        const auto M = ygrad_grid_desc_m_o.GetLength(I0);
        const auto O = ygrad_grid_desc_m_o.GetLength(I1);

        const auto Y_M0 = M / Y_M1;

        return transform_tensor_descriptor(
            ygrad_grid_desc_m_o,
            make_tuple(make_unmerge_transform(make_tuple(Y_M0, Y_M1)),
                       make_pass_through_transform(O)),
            make_tuple(Sequence<0>{}, Sequence<1>{}),
            make_tuple(Sequence<0, 2>{}, Sequence<1>{}));
    }

    //
    // dP = dY * V^T
    //

    // YGrad in Gemm A position
    static auto MakeYGradGridDescriptor_O0_M_O1(const std::vector<index_t>& y_gs_ms_os_lengths_vec,
                                                const std::vector<index_t>& y_gs_ms_os_strides_vec)
    {
        return Transform::MakeAGridDescriptor_AK0_M_AK1(
            Transform::MakeAGridDescriptor_M_K(y_gs_ms_os_lengths_vec, y_gs_ms_os_strides_vec),
            Number<Y_O1>{});
    }

    // V in Gemm B position
    static auto MakeVGridDescriptor_O0_N_O1(const std::vector<index_t>& v_gs_os_ns_lengths_vec,
                                            const std::vector<index_t>& v_gs_os_ns_strides_vec)
    {
        // v_gs_os_ns -> vgrad_gs_ns_os. O dims last because output is row-major.
        // Here directly rearrange lengths/strides before constructing tensor descriptor to reduce
        // transformation overhead
        // TODO: This will be much easier when inputs are Gs, Ms, Ns, Os. So there's no need to
        // extract subsequence and shuffle them.
        const index_t num_dims = NumDimG + NumDimN + NumDimO;

        // 0, 1, .. NumDimG - 1
        std::vector<index_t> gs_ids(NumDimG);
        std::iota(gs_ids.begin(), gs_ids.end(), 0);

        // NumDimG, NumDimG + 1, ... NumDimG + NumDimO - 1
        std::vector<index_t> os_ids(NumDimO);
        std::iota(os_ids.begin(), os_ids.end(), NumDimG);

        // NumDimG + NumDimO, NumDimG + NumDimO + 1, ... NumDimG + NumDimO + NumDimN - 1
        std::vector<index_t> ns_ids(NumDimN);
        std::iota(ns_ids.begin(), ns_ids.end(), NumDimG + NumDimO);

        std::vector<index_t> ids_old2new;
        ids_old2new.insert(ids_old2new.end(), gs_ids.begin(), gs_ids.end());
        ids_old2new.insert(ids_old2new.end(), ns_ids.begin(), ns_ids.end());
        ids_old2new.insert(ids_old2new.end(), os_ids.begin(), os_ids.end());

        std::vector<index_t> v_gs_ns_os_lengths_vec(num_dims), v_gs_ns_os_strides_vec(num_dims);
        for(int i = 0; i < num_dims; i++)
        {
            index_t id_new            = ids_old2new[i];
            v_gs_ns_os_lengths_vec[i] = v_gs_os_ns_lengths_vec[id_new];
            v_gs_ns_os_strides_vec[i] = v_gs_os_ns_strides_vec[id_new];
        }

        const auto v_grid_desc_nraw_oraw =
            MakeGridDescriptorPair<NumDimG, NumDimN, NumDimO, TensorSpecialization::Default>(
                v_gs_ns_os_lengths_vec, v_gs_ns_os_strides_vec)
                .second;

        const auto v_grid_desc_n_o = PadTensorDescriptor(v_grid_desc_nraw_oraw,
                                                         make_tuple(NPerBlock, Gemm1NPerBlock),
                                                         Sequence<padder.PadN, padder.PadO>{});

        // N_O to O0_N_O1; to refactor
        return Transform::MakeB0GridDescriptor_BK0_N_BK1(v_grid_desc_n_o, Number<V_O1>{});
    }

    // Z in Gemm0 C position
    static auto MakeZGridDescriptor_M_N(const std::vector<index_t>& z_gs_ms_ns_lengths_vec,
                                        const std::vector<index_t>& z_gs_ms_ns_strides_vec)
    {
        return Transform::MakeCGridDescriptor_M_N(z_gs_ms_ns_lengths_vec, z_gs_ms_ns_strides_vec);
    }
    //
    // dS_i_j = P_i_j .* (dP_i_j - dY_i dot Y_i)
    //

    //
    // dQ = alpha * dS * K
    //

    // QGrad in Gemm C position
    static auto MakeQGradGridDescriptor_M_K(const std::vector<index_t>& q_gs_ms_ks_lengths_vec,
                                            const std::vector<index_t>& q_gs_ms_ks_strides_vec)
    {
        return Transform::MakeCGridDescriptor_M_N(q_gs_ms_ks_lengths_vec, q_gs_ms_ks_strides_vec);
    }

    //
    // dK = alpha * dS^T * Q
    //

    // KGrad in Gemm C position
    static auto MakeKGradGridDescriptor_N_K(const std::vector<index_t>& k_gs_ns_ks_lengths_vec,
                                            const std::vector<index_t>& k_gs_ns_ks_strides_vec)
    {
        return Transform::MakeCGridDescriptor_M_N(k_gs_ns_ks_lengths_vec, k_gs_ns_ks_strides_vec);
    }

    static auto MakeLSEGridDescriptor_M(index_t MRaw)
    {
        const auto lse_grid_desc_mraw = make_naive_tensor_descriptor_packed(make_tuple(MRaw));

        const auto M    = math::integer_divide_ceil(MRaw, MPerBlock) * MPerBlock;
        const auto MPad = M - MRaw;

        if constexpr(GemmSpec == GemmSpecialization::MPadding ||
                     GemmSpec == GemmSpecialization::MNPadding ||
                     GemmSpec == GemmSpecialization::MKPadding ||
                     GemmSpec == GemmSpecialization::MNKPadding)
        {
            // pad M
            return transform_tensor_descriptor(lse_grid_desc_mraw,
                                               make_tuple(make_right_pad_transform(MRaw, MPad)),
                                               make_tuple(Sequence<0>{}),
                                               make_tuple(Sequence<0>{}));
        }
        else
        {
            // not pad M
            return lse_grid_desc_mraw;
        }
    }

    using AGridDesc_AK0_M_AK1  = decltype(MakeAGridDescriptor_AK0_M_AK1({}, {}));
    using BGridDesc_BK0_N_BK1  = decltype(MakeBGridDescriptor_BK0_N_BK1({}, {}));
    using B1GridDesc_BK0_N_BK1 = decltype(MakeB1GridDescriptor_BK0_N_BK1({}, {}));
    using YGridDesc_M_O        = decltype(Transform::MakeCGridDescriptor_M_N({}, {}));
    using LSEGridDesc_M        = decltype(MakeLSEGridDescriptor_M(1));
    using AGridDesc_G_M_K      = decltype(Transform::MakeAGridDescriptor_G_M_K({}, {}));
    using BGridDesc_G_N_K      = decltype(Transform::MakeB0GridDescriptor_G_N_K({}, {}));
    using B1GridDesc_G_N_K     = decltype(Transform::MakeB1GridDescriptor_G_N_K({}, {}));
    using CGridDesc_G_M_N      = decltype(Transform::MakeCGridDescriptor_G_M_N({}, {}));
    using ZGridDesc_G_M_N      = decltype(Transform::MakeCGridDescriptor_G_M_N({}, {}));

    using KGridDesc_N_K         = decltype(Transform::MakeB0GridDescriptor_N_K({}, {}));
    using YGradGridDesc_M0_O_M1 = decltype(MakeYGradGridDescriptor_M0_O_M1(YGridDesc_M_O{}));
    using ZGridDesc_M_N         = decltype(MakeZGridDescriptor_M_N({}, {}));

    constexpr static auto make_MaskOutPredicate()
    {
        if constexpr(MaskingSpec == MaskingSpecialization::MaskDisabled)
        {
            return MaskDisabledPredicate{};
        }
        else if constexpr(MaskingSpec == MaskingSpecialization::MaskOutUpperTriangle)
        {
            return MaskOutUpperTrianglePredicate{};
        }
    }
    using C0MatrixMask = C0MatrixMask_impl<decltype(make_MaskOutPredicate())>;

    struct ComputeBasePtrOfStridedBatch
    {
        ComputeBasePtrOfStridedBatch(const AGridDesc_G_M_K& a_grid_desc_g_m_k,
                                     const BGridDesc_G_N_K& b_grid_desc_g_n_k,
                                     const ZGridDesc_G_M_N& z_grid_desc_g_m_n,
                                     const B1GridDesc_G_N_K& b1_grid_desc_g_n_k,
                                     const CGridDesc_G_M_N& c_grid_desc_g_m_n,
                                     index_t BatchStrideLSE)
            : a_grid_desc_g_m_k_(a_grid_desc_g_m_k),
              b_grid_desc_g_n_k_(b_grid_desc_g_n_k),
              z_grid_desc_g_m_n_(z_grid_desc_g_m_n),
              b1_grid_desc_g_n_k_(b1_grid_desc_g_n_k),
              c_grid_desc_g_m_n_(c_grid_desc_g_m_n),
              BatchStrideLSE_(BatchStrideLSE)
        {
        }

        __host__ __device__ constexpr long_index_t GetABasePtr(index_t g_idx) const
        {
            return a_grid_desc_g_m_k_.CalculateOffset(make_multi_index(g_idx, 0, 0));
        }

        __host__ __device__ constexpr long_index_t GetBBasePtr(index_t g_idx) const
        {
            return b_grid_desc_g_n_k_.CalculateOffset(make_multi_index(g_idx, 0, 0));
        }

        __host__ __device__ constexpr long_index_t GetZBasePtr(index_t g_idx) const
        {
            return z_grid_desc_g_m_n_.CalculateOffset(make_multi_index(g_idx, 0, 0));
        }

        __host__ __device__ constexpr long_index_t GetB1BasePtr(index_t g_idx) const
        {
            return b1_grid_desc_g_n_k_.CalculateOffset(make_multi_index(g_idx, 0, 0));
        }

        __host__ __device__ constexpr long_index_t GetCBasePtr(index_t g_idx) const
        {
            return c_grid_desc_g_m_n_.CalculateOffset(make_multi_index(g_idx, 0, 0));
        }

        __host__ __device__ constexpr long_index_t GetLSEBasePtr(index_t g_idx) const
        {
            return g_idx * static_cast<long_index_t>(BatchStrideLSE_);
        }

        private:
        AGridDesc_G_M_K a_grid_desc_g_m_k_;
        BGridDesc_G_N_K b_grid_desc_g_n_k_;
        ZGridDesc_G_M_N z_grid_desc_g_m_n_;
        B1GridDesc_G_N_K b1_grid_desc_g_n_k_;
        CGridDesc_G_M_N c_grid_desc_g_m_n_;

        index_t BatchStrideLSE_;
    };

    // GridwiseGemm
    using GridwiseGemm = GridwiseBatchedMultiheadAttentionBackward_Xdl_CShuffle_V2<
        InputDataType, // TODO: distinguish A/B datatype
        OutputDataType,
        ZDataType,
        GemmDataType,
        GemmAccDataType,
        CShuffleDataType,
        LSEDataType,
        AElementwiseOperation,
        BElementwiseOperation,
        AccElementwiseOperation,
        B1ElementwiseOperation,
        CElementwiseOperation,
        InMemoryDataOperationEnum::Set,
        AGridDesc_AK0_M_AK1,
        BGridDesc_BK0_N_BK1,
        KGridDesc_N_K,
        ZGridDesc_M_N,
        B1GridDesc_BK0_N_BK1,
        YGridDesc_M_O,
        LSEGridDesc_M,
        NumGemmKPrefetchStage,
        BlockSize,
        MPerBlock,
        NPerBlock,
        KPerBlock,
        Gemm1NPerBlock,
        Gemm1KPerBlock,
        AK1,
        BK1,
        B1K1,
        MPerXDL,
        NPerXDL,
        MXdlPerWave,
        NXdlPerWave,
        Gemm1NXdlPerWave,
        Gemm2NXdlPerWave,
        ABlockTransferThreadClusterLengths_AK0_M_AK1,
        ABlockTransferThreadClusterArrangeOrder,
        ABlockTransferSrcAccessOrder,
        ABlockTransferSrcVectorDim,
        ABlockTransferSrcScalarPerVector,
        ABlockTransferDstScalarPerVector_AK1,
        true,
        ABlockLdsExtraM,
        BBlockTransferThreadClusterLengths_BK0_N_BK1,
        BBlockTransferThreadClusterArrangeOrder,
        BBlockTransferSrcAccessOrder,
        BBlockTransferSrcVectorDim,
        BBlockTransferSrcScalarPerVector,
        BBlockTransferDstScalarPerVector_BK1,
        true,
        BBlockLdsExtraN,
        B1BlockTransferThreadClusterLengths_BK0_N_BK1,
        B1BlockTransferThreadClusterArrangeOrder,
        B1BlockTransferSrcAccessOrder,
        B1BlockTransferSrcVectorDim,
        B1BlockTransferSrcScalarPerVector,
        B1BlockTransferDstScalarPerVector_BK1,
        true,
        B1BlockLdsExtraN,
        CShuffleMXdlPerWavePerShuffle,
        CShuffleNXdlPerWavePerShuffle,
        CShuffleBlockTransferClusterLengths_MBlock_MPerBlock_NBlock_NPerBlock,
        CShuffleBlockTransferScalarPerVector_NPerBlock,
        LoopSched,
        Transform::matrix_padder.PadN,
        MaskingSpec == MaskingSpecialization::MaskOutUpperTriangle,
        Deterministic>;

    // Argument
    struct Argument : public BaseArgument
    {
        Argument(
            const InputDataType* p_a_grid,
            const InputDataType* p_b_grid,
            ZDataType* p_z_grid,
            const InputDataType* p_b1_grid,
            const InputDataType* p_c_grid, // for dS
            const LSEDataType* p_lse_grid,
            const InputDataType* p_ygrad_grid,
            OutputDataType* p_qgrad_grid,
            OutputDataType* p_kgrad_grid,
            OutputDataType* p_vgrad_grid,
            const std::array<void*, NumAcc0Bias> p_acc0_biases,
            const std::array<void*, NumAcc1Bias> p_acc1_biases,
            const std::vector<index_t>& a_gs_ms_ks_lengths,
            const std::vector<index_t>& a_gs_ms_ks_strides,
            const std::vector<index_t>& b_gs_ns_ks_lengths,
            const std::vector<index_t>& b_gs_ns_ks_strides,
            const std::vector<index_t>& z_gs_ms_ns_lengths,
            const std::vector<index_t>& z_gs_ms_ns_strides,
            const std::vector<index_t>& b1_gs_gemm1ns_gemm1ks_lengths, // b1_gs_os_ns_lengths
            const std::vector<index_t>& b1_gs_gemm1ns_gemm1ks_strides, // b1_gs_os_ns_strides
            const std::vector<index_t>& c_gs_ms_gemm1ns_lengths,       // c_gs_ms_os_lengths
            const std::vector<index_t>& c_gs_ms_gemm1ns_strides,       // c_gs_ms_os_strides
            const std::vector<index_t>& lse_gs_ms_lengths,
            const std::array<std::vector<ck::index_t>, NumAcc0Bias> acc0_biases_gs_ms_ns_lengths,
            const std::array<std::vector<ck::index_t>, NumAcc0Bias> acc0_biases_gs_ms_ns_strides,
            const std::array<std::vector<ck::index_t>, NumAcc1Bias>
                acc1_biases_gs_ms_gemm1ns_lengths, // acc1_biases_gs_ms_os_lengths
            const std::array<std::vector<ck::index_t>, NumAcc1Bias>
                acc1_biases_gs_ms_gemm1ns_strides, // acc1_biases_gs_ms_os_strides
            AElementwiseOperation a_element_op,
            BElementwiseOperation b_element_op,
            AccElementwiseOperation acc_element_op,
            B1ElementwiseOperation b1_element_op,
            CElementwiseOperation c_element_op,
            float p_drop,
            std::tuple<unsigned long long, unsigned long long> seeds)
            : p_a_grid_{p_a_grid},
              p_b_grid_{p_b_grid},
              p_z_grid_{p_z_grid},
              p_b1_grid_{p_b1_grid},
              p_c_grid_{p_c_grid},
              p_lse_grid_{p_lse_grid},
              p_ygrad_grid_{p_ygrad_grid},
              p_qgrad_grid_{p_qgrad_grid},
              p_kgrad_grid_{p_kgrad_grid},
              p_vgrad_grid_{p_vgrad_grid},
              a_grid_desc_ak0_m_ak1_{
                  DeviceOp::MakeAGridDescriptor_AK0_M_AK1(a_gs_ms_ks_lengths, a_gs_ms_ks_strides)},
              b_grid_desc_bk0_n_bk1_{
                  DeviceOp::MakeBGridDescriptor_BK0_N_BK1(b_gs_ns_ks_lengths, b_gs_ns_ks_strides)},
              z_grid_desc_m_n_{MakeZGridDescriptor_M_N(z_gs_ms_ns_lengths, z_gs_ms_ns_strides)},
              b1_grid_desc_bk0_n_bk1_{DeviceOp::MakeB1GridDescriptor_BK0_N_BK1(
                  b1_gs_gemm1ns_gemm1ks_lengths, b1_gs_gemm1ns_gemm1ks_strides)},
              y_grid_desc_m_o_{Transform::MakeCGridDescriptor_M_N(c_gs_ms_gemm1ns_lengths,
                                                                  c_gs_ms_gemm1ns_strides)},
              lse_grid_desc_m_{DeviceOp::MakeLSEGridDescriptor_M(lse_gs_ms_lengths[NumDimG])},
              k_grid_desc_n_k_{
                  Transform::MakeB0GridDescriptor_N_K(b_gs_ns_ks_lengths, b_gs_ns_ks_strides)},
              ygrad_grid_desc_m0_o_m1_{DeviceOp::MakeYGradGridDescriptor_M0_O_M1(y_grid_desc_m_o_)},
              // batch offsets
              a_grid_desc_g_m_k_{
                  Transform::MakeAGridDescriptor_G_M_K(a_gs_ms_ks_lengths, a_gs_ms_ks_strides)},
              b_grid_desc_g_n_k_{
                  Transform::MakeB0GridDescriptor_G_N_K(b_gs_ns_ks_lengths, b_gs_ns_ks_strides)},
              b1_grid_desc_g_n_k_{Transform::MakeB1GridDescriptor_G_N_K(
                  b1_gs_gemm1ns_gemm1ks_lengths, b1_gs_gemm1ns_gemm1ks_strides)},
              c_grid_desc_g_m_n_{Transform::MakeCGridDescriptor_G_M_N(c_gs_ms_gemm1ns_lengths,
                                                                      c_gs_ms_gemm1ns_strides)},
              z_grid_desc_g_m_n_{
                  Transform::MakeCGridDescriptor_G_M_N(z_gs_ms_ns_lengths, z_gs_ms_ns_strides)},
              y_grid_desc_mblock_mperblock_oblock_operblock_{},
              block_2_ctile_map_{GridwiseGemm::MakeDefaultBlock2CTileMap(k_grid_desc_n_k_)},
              a_element_op_{a_element_op},
              b_element_op_{b_element_op},
              acc_element_op_{acc_element_op},
              b1_element_op_{b1_element_op},
              c_element_op_{c_element_op},
              c0_matrix_mask_{b_grid_desc_g_n_k_.GetLength(I1)},
              raw_lengths_mz_nz_kz_gemm1nz_{a_gs_ms_ks_lengths[NumDimG + NumDimM - 1],
                                            b_gs_ns_ks_lengths[NumDimG + NumDimN - 1],
                                            b_gs_ns_ks_lengths[NumDimG + NumDimN + NumDimK - 1],
                                            b1_gs_gemm1ns_gemm1ks_lengths[NumDimG + NumDimO - 1]},
              a_mz_kz_strides_{a_gs_ms_ks_strides[NumDimG + NumDimM - 1],
                               a_gs_ms_ks_strides[NumDimG + NumDimM + NumDimK - 1]},
              b_nz_kz_strides_{b_gs_ns_ks_strides[NumDimG + NumDimN - 1],
                               b_gs_ns_ks_strides[NumDimG + NumDimN + NumDimK - 1]},
              b1_nz_kz_strides_{b1_gs_gemm1ns_gemm1ks_strides[NumDimG + NumDimO - 1],
                                b1_gs_gemm1ns_gemm1ks_strides[NumDimG + NumDimO + NumDimN - 1]},
              c_mz_gemm1nz_strides_{c_gs_ms_gemm1ns_strides[NumDimG + NumDimM - 1],
                                    c_gs_ms_gemm1ns_strides[NumDimG + NumDimM + NumDimO - 1]},
              batch_count_{c_grid_desc_g_m_n_.GetLength(I0)},
              compute_base_ptr_of_batch_{
                  a_grid_desc_g_m_k_,
                  b_grid_desc_g_n_k_,
                  z_grid_desc_g_m_n_,
                  b1_grid_desc_g_n_k_,
                  c_grid_desc_g_m_n_,
                  type_convert<index_t>(lse_grid_desc_m_.GetElementSpaceSize())},
              p_drop_{p_drop}
        {
            // TODO: implement bias addition
            ignore = p_acc0_biases;
            ignore = p_acc1_biases;
            ignore = acc0_biases_gs_ms_ns_lengths;
            ignore = acc0_biases_gs_ms_ns_strides;
            ignore = acc1_biases_gs_ms_gemm1ns_lengths;
            ignore = acc1_biases_gs_ms_gemm1ns_strides;

            if(GridwiseGemm::CheckValidity(a_grid_desc_ak0_m_ak1_,
                                           b_grid_desc_bk0_n_bk1_,
                                           b1_grid_desc_bk0_n_bk1_,
                                           y_grid_desc_m_o_))
            {
                y_grid_desc_mblock_mperblock_oblock_operblock_ =
                    GridwiseGemm::MakeYGridDescriptor_MBlock_MPerBlock_OBlock_OPerBlock(
                        y_grid_desc_m_o_);
            }

            seed_   = std::get<0>(seeds);
            offset_ = std::get<1>(seeds);

            c_grid_desc_m0_n0_m1_n1_m2_n2_m3_n3_n4_n5_ =
                GridwiseGemm::MakeCGridDescriptor_M0_N0_M1_N1_M2_N2_M3_N3_N4_N5(z_grid_desc_m_n_);
            // Print();
        }

        void Print() const
        {
            std::cout << "a_grid_desc_g_m_k_: " << a_grid_desc_g_m_k_.GetLength(I0) << ", "
                      << a_grid_desc_g_m_k_.GetLength(I1) << ", "
                      << a_grid_desc_g_m_k_.GetLength(I2) << '\n';
            // a_grid_desc_g_m_k_.Print();
            std::cout << "b_grid_desc_g_n_k_: " << b_grid_desc_g_n_k_.GetLength(I0) << ", "
                      << b_grid_desc_g_n_k_.GetLength(I1) << ", "
                      << b_grid_desc_g_n_k_.GetLength(I2) << '\n';
            // b_grid_desc_g_n_k_.Print();
            std::cout << "b1_grid_desc_g_o_n_: " << b1_grid_desc_g_n_k_.GetLength(I0) << ", "
                      << b1_grid_desc_g_n_k_.GetLength(I1) << ", "
                      << b1_grid_desc_g_n_k_.GetLength(I2) << '\n';
            // b1_grid_desc_g_n_k_.Print();
            std::cout << "c_grid_desc_g_m_o_: " << c_grid_desc_g_m_n_.GetLength(I0) << ", "
                      << c_grid_desc_g_m_n_.GetLength(I1) << ", "
                      << c_grid_desc_g_m_n_.GetLength(I2) << '\n';
            // c_grid_desc_g_m_n_.Print();
            std::cout << "k_grid_desc_n_k_: " << k_grid_desc_n_k_.GetLength(I0) << ", "
                      << k_grid_desc_n_k_.GetLength(I1) << '\n';
            std::cout << "ygrad_grid_desc_m0_o_m1_: " << ygrad_grid_desc_m0_o_m1_.GetLength(I0)
                      << ", " << ygrad_grid_desc_m0_o_m1_.GetLength(I1) << ", "
                      << ygrad_grid_desc_m0_o_m1_.GetLength(I2) << '\n';
        }

        // pointers
        const InputDataType* p_a_grid_;
        const InputDataType* p_b_grid_;
        ZDataType* p_z_grid_;
        const InputDataType* p_b1_grid_;
        const InputDataType* p_c_grid_;
        const LSEDataType* p_lse_grid_;
        const InputDataType* p_ygrad_grid_;
        OutputDataType* p_qgrad_grid_;
        OutputDataType* p_kgrad_grid_;
        OutputDataType* p_vgrad_grid_;

        // tensor descriptor
        AGridDesc_AK0_M_AK1 a_grid_desc_ak0_m_ak1_;
        BGridDesc_BK0_N_BK1 b_grid_desc_bk0_n_bk1_;
        ZGridDesc_M_N z_grid_desc_m_n_;
        B1GridDesc_BK0_N_BK1 b1_grid_desc_bk0_n_bk1_;
        YGridDesc_M_O y_grid_desc_m_o_;
        LSEGridDesc_M lse_grid_desc_m_;
        KGridDesc_N_K k_grid_desc_n_k_;
        YGradGridDesc_M0_O_M1 ygrad_grid_desc_m0_o_m1_;

        // batch offsets
        AGridDesc_G_M_K a_grid_desc_g_m_k_;
        BGridDesc_G_N_K b_grid_desc_g_n_k_;
        B1GridDesc_G_N_K b1_grid_desc_g_n_k_;
        CGridDesc_G_M_N c_grid_desc_g_m_n_;
        ZGridDesc_G_M_N z_grid_desc_g_m_n_;
        typename GridwiseGemm::YGridDescriptor_MBlock_MPerBlock_OBlock_OPerBlock
            y_grid_desc_mblock_mperblock_oblock_operblock_;

        typename GridwiseGemm::ZGridDescriptor_M0_N0_M1_N1_M2_N2_M3_N3_N4_N5
            c_grid_desc_m0_n0_m1_n1_m2_n2_m3_n3_n4_n5_;

        // block-to-c-tile map
        typename GridwiseGemm::DefaultBlock2CTileMap block_2_ctile_map_;

        // element-wise op
        AElementwiseOperation a_element_op_;
        BElementwiseOperation b_element_op_;
        AccElementwiseOperation acc_element_op_;
        B1ElementwiseOperation b1_element_op_;
        CElementwiseOperation c_element_op_;

        // check C0 masking and padding
        C0MatrixMask c0_matrix_mask_;

        // For robust IsSupportedArgument() check
        std::vector<index_t> raw_lengths_mz_nz_kz_gemm1nz_;
        std::vector<index_t> a_mz_kz_strides_;
        std::vector<index_t> b_nz_kz_strides_;
        std::vector<index_t> b1_nz_kz_strides_;
        std::vector<index_t> c_mz_gemm1nz_strides_;

        index_t batch_count_;
        ComputeBasePtrOfStridedBatch compute_base_ptr_of_batch_;

        float p_drop_;
        unsigned long long seed_;
        unsigned long long offset_;
    };

    // Invoker
    struct Invoker : public BaseInvoker
    {
        using Argument = DeviceOp::Argument;

        float Run(const Argument& arg, const StreamConfig& stream_config = StreamConfig{})
        {
            if(!DeviceOp::IsSupportedArgument(arg))
            {
                throw std::runtime_error("wrong! unsupported argument");
            }

            const index_t grid_size =
                (Deterministic ? 1
                               : arg.block_2_ctile_map_.CalculateGridSize(arg.k_grid_desc_n_k_)) *
                arg.batch_count_;

            // Gemm0_K
            const auto K =
                arg.a_grid_desc_ak0_m_ak1_.GetLength(I0) * arg.a_grid_desc_ak0_m_ak1_.GetLength(I2);

            float ave_time = 0;

            auto launch_kernel = [&](auto has_main_k_block_loop_) {
                const auto kernel = kernel_batched_multihead_attention_backward_xdl_cshuffle_v2<
                    GridwiseGemm,
                    InputDataType,
                    OutputDataType,
                    ZDataType,
                    LSEDataType,
                    AElementwiseOperation,
                    BElementwiseOperation,
                    AccElementwiseOperation,
                    B1ElementwiseOperation,
                    CElementwiseOperation,
                    DeviceOp::AGridDesc_AK0_M_AK1,
                    DeviceOp::BGridDesc_BK0_N_BK1,
                    typename GridwiseGemm::ZGridDescriptor_M0_N0_M1_N1_M2_N2_M3_N3_N4_N5,
                    DeviceOp::B1GridDesc_BK0_N_BK1,
                    typename GridwiseGemm::YGridDescriptor_MBlock_MPerBlock_OBlock_OPerBlock,
                    DeviceOp::LSEGridDesc_M,
                    DeviceOp::YGradGridDesc_M0_O_M1,
                    typename GridwiseGemm::DefaultBlock2CTileMap,
                    ComputeBasePtrOfStridedBatch,
                    C0MatrixMask,
                    has_main_k_block_loop_,
                    Deterministic>;

                return launch_and_time_kernel(
                    stream_config,
                    kernel,
                    dim3(grid_size),
                    dim3(BlockSize),
                    0,
                    arg.p_a_grid_,
                    arg.p_b_grid_,
                    arg.p_z_grid_,
                    arg.p_b1_grid_,
                    arg.p_c_grid_,
                    arg.p_lse_grid_,
                    arg.p_ygrad_grid_,
                    arg.p_qgrad_grid_,
                    arg.p_kgrad_grid_,
                    arg.p_vgrad_grid_,
                    arg.a_element_op_,
                    arg.b_element_op_,
                    arg.acc_element_op_,
                    arg.b1_element_op_,
                    arg.c_element_op_,
                    arg.a_grid_desc_ak0_m_ak1_,
                    arg.b_grid_desc_bk0_n_bk1_,
                    arg.c_grid_desc_m0_n0_m1_n1_m2_n2_m3_n3_n4_n5_,
                    arg.b1_grid_desc_bk0_n_bk1_,
                    arg.y_grid_desc_mblock_mperblock_oblock_operblock_,
                    arg.lse_grid_desc_m_,
                    arg.ygrad_grid_desc_m0_o_m1_,
                    arg.block_2_ctile_map_,
                    arg.batch_count_,
                    arg.block_2_ctile_map_.CalculateGridSize(arg.k_grid_desc_n_k_),
                    arg.compute_base_ptr_of_batch_,
                    arg.c0_matrix_mask_,
                    arg.p_drop_,
                    arg.seed_,
                    arg.offset_);
            };

            // Gemm1_K is split into Gemm1_K0/K1 where K1 is known at compile time, so we only need
            // to concern Gemm0's loop
            if(GridwiseGemm::CalculateHasMainKBlockLoop(K))
            {
                ave_time = launch_kernel(integral_constant<bool, true>{});
            }
            else
            {
                ave_time = launch_kernel(integral_constant<bool, false>{});
            }

            return ave_time;
        }

        // polymorphic
        float Run(const BaseArgument* p_arg,
                  const StreamConfig& stream_config = StreamConfig{}) override
        {
            return Run(*dynamic_cast<const Argument*>(p_arg), stream_config);
        }
    };

    static constexpr bool IsValidCompilationParameter()
    {
        // TODO: properly implement this check
        return true;
    }

    static bool IsSupportedArgument(const Argument& arg)
    {
        if(!(ck::get_device_name() == "gfx908" || ck::get_device_name() == "gfx90a"))
        {
            return false;
        }

        // TODO: Check if tensor specialization & strides mismatch

        // Check if C permute dimension matches GEMM + GEMM shape
        const index_t c_g       = arg.c_grid_desc_g_m_n_.GetLength(I0); // unpadded
        const index_t c_m       = arg.y_grid_desc_m_o_.GetLength(I0);
        const index_t c_gemm1n  = arg.y_grid_desc_m_o_.GetLength(I1);
        const index_t a_m       = arg.a_grid_desc_ak0_m_ak1_.GetLength(I1);
        const index_t b1_gemm1n = arg.b1_grid_desc_bk0_n_bk1_.GetLength(I1);

        if(!(c_g == arg.batch_count_ && c_m == a_m && c_gemm1n == b1_gemm1n))
        {
            return false;
        }

        // Note: we need raw lengths since threadwise copy can not handle vector load when part of
        // vector is out of bounds
        // Note: need lowest dim in Ms/Ns/Ks/Os, not merged M/N/K/O
        const auto MzRaw      = arg.raw_lengths_mz_nz_kz_gemm1nz_[0];
        const auto NzRaw      = arg.raw_lengths_mz_nz_kz_gemm1nz_[1];
        const auto KzRaw      = arg.raw_lengths_mz_nz_kz_gemm1nz_[2];
        const auto Gemm1NzRaw = arg.raw_lengths_mz_nz_kz_gemm1nz_[3];

        // Check scalar per vector requirement
        const auto a_extent_lowest  = ABlockTransferSrcVectorDim == 2 ? KzRaw : MzRaw;
        const auto b_extent_lowest  = BBlockTransferSrcVectorDim == 2 ? KzRaw : NzRaw;
        const auto b1_extent_lowest = B1BlockTransferSrcVectorDim == 2 ? NzRaw : Gemm1NzRaw;
        const auto c_extent_lowest  = Gemm1NzRaw;

        if(!(a_extent_lowest % ABlockTransferSrcScalarPerVector == 0 &&
             b_extent_lowest % BBlockTransferSrcScalarPerVector == 0 &&
             b1_extent_lowest % B1BlockTransferSrcScalarPerVector == 0 &&
             c_extent_lowest % CShuffleBlockTransferScalarPerVector_NPerBlock == 0))
        {
            return false;
        }

        // Check vector load/store requirement
        const auto a_stride_lowest =
            ABlockTransferSrcVectorDim == 2 ? arg.a_mz_kz_strides_[1] : arg.a_mz_kz_strides_[0];
        const auto b_stride_lowest =
            BBlockTransferSrcVectorDim == 2 ? arg.b_nz_kz_strides_[1] : arg.b_nz_kz_strides_[0];
        const auto b1_stride_lowest =
            B1BlockTransferSrcVectorDim == 2 ? arg.b1_nz_kz_strides_[1] : arg.b1_nz_kz_strides_[0];
        const auto c_stride_lowest =
            arg.c_mz_gemm1nz_strides_[1]; // cshuffle assumes lowest dim in Gemm1Ns to be contiguous

        if(!(a_stride_lowest == 1 || b_stride_lowest == 1 || b1_stride_lowest == 1 ||
             c_stride_lowest == 1))
        {
            return false;
        }

        return GridwiseGemm::CheckValidity(arg.a_grid_desc_ak0_m_ak1_,
                                           arg.b_grid_desc_bk0_n_bk1_,
                                           arg.b1_grid_desc_bk0_n_bk1_,
                                           arg.y_grid_desc_m_o_);
    }

    // polymorphic
    bool IsSupportedArgument(const BaseArgument* p_arg) override
    {
        return IsSupportedArgument(*dynamic_cast<const Argument*>(p_arg));
    }

    static auto MakeArgument(
        const InputDataType* p_a,
        const InputDataType* p_b,
        ZDataType* p_z,
        const InputDataType* p_b1,
        const InputDataType* p_c,
        const LSEDataType* p_lse,
        const InputDataType* p_ygrad_grid,
        OutputDataType* p_qgrad_grid,
        OutputDataType* p_kgrad_grid,
        OutputDataType* p_vgrad_grid,
        const std::array<void*, NumAcc0Bias> p_acc0_biases,
        const std::array<void*, NumAcc1Bias> p_acc1_biases,
        const std::vector<index_t>& a_gs_ms_ks_lengths,
        const std::vector<index_t>& a_gs_ms_ks_strides,
        const std::vector<index_t>& b_gs_ns_ks_lengths,
        const std::vector<index_t>& b_gs_ns_ks_strides,
        const std::vector<index_t>& z_gs_ms_ns_lengths,
        const std::vector<index_t>& z_gs_ms_ns_strides,
        const std::vector<index_t>& b1_gs_gemm1ns_gemm1ks_lengths, // b1_gs_os_ns_lengths
        const std::vector<index_t>& b1_gs_gemm1ns_gemm1ks_strides, // b1_gs_os_ns_strides
        const std::vector<index_t>& c_gs_ms_gemm1ns_lengths,       // c_gs_ms_os_lengths
        const std::vector<index_t>& c_gs_ms_gemm1ns_strides,       // c_gs_ms_os_strides
        const std::vector<index_t>& lse_gs_ms_lengths,
        const std::array<std::vector<ck::index_t>, NumAcc0Bias> acc0_biases_gs_ms_ns_lengths,
        const std::array<std::vector<ck::index_t>, NumAcc0Bias> acc0_biases_gs_ms_ns_strides,
        const std::array<std::vector<ck::index_t>, NumAcc1Bias>
            acc1_biases_gs_ms_gemm1ns_lengths, // acc1_biases_gs_ms_os_lengths
        const std::array<std::vector<ck::index_t>, NumAcc1Bias>
            acc1_biases_gs_ms_gemm1ns_strides, // acc1_biases_gs_ms_os_strides
        AElementwiseOperation a_element_op,
        BElementwiseOperation b_element_op,
        AccElementwiseOperation acc_element_op,
        B1ElementwiseOperation b1_element_op,
        CElementwiseOperation c_element_op,
        float p_drop,
        std::tuple<unsigned long long, unsigned long long> seeds)
    {
        return Argument{p_a,
                        p_b,
                        p_z,
                        p_b1,
                        p_c,
                        p_lse,
                        p_ygrad_grid,
                        p_qgrad_grid,
                        p_kgrad_grid,
                        p_vgrad_grid,
                        p_acc0_biases,
                        p_acc1_biases,
                        a_gs_ms_ks_lengths,
                        a_gs_ms_ks_strides,
                        b_gs_ns_ks_lengths,
                        b_gs_ns_ks_strides,
                        z_gs_ms_ns_lengths,
                        z_gs_ms_ns_strides,
                        b1_gs_gemm1ns_gemm1ks_lengths, // b1_gs_os_ns_lengths
                        b1_gs_gemm1ns_gemm1ks_strides, // b1_gs_os_ns_strides
                        c_gs_ms_gemm1ns_lengths,       // c_gs_ms_os_lengths
                        c_gs_ms_gemm1ns_strides,       // c_gs_ms_os_strides
                        lse_gs_ms_lengths,
                        acc0_biases_gs_ms_ns_lengths,
                        acc0_biases_gs_ms_ns_strides,
                        acc1_biases_gs_ms_gemm1ns_lengths, // acc1_biases_gs_ms_os_lengths
                        acc1_biases_gs_ms_gemm1ns_strides, // acc1_biases_gs_ms_os_strides
                        a_element_op,
                        b_element_op,
                        acc_element_op,
                        b1_element_op,
                        c_element_op,
                        p_drop,
                        seeds};
    }

    static auto MakeInvoker() { return Invoker{}; }

    // polymorphic
    // FIXME: constness
    std::unique_ptr<BaseArgument> MakeArgumentPointer(
        const void* p_a,
        const void* p_b,
        void* p_z,
        const void* p_b1,
        const void* p_c,
        const void* p_lse,
        const void* p_ygrad_grid,
        void* p_qgrad_grid,
        void* p_kgrad_grid,
        void* p_vgrad_grid,
        const std::array<void*, NumAcc0Bias> p_acc0_biases,
        const std::array<void*, NumAcc1Bias> p_acc1_biases,
        const std::vector<index_t>& a_gs_ms_ks_lengths,
        const std::vector<index_t>& a_gs_ms_ks_strides,
        const std::vector<index_t>& b_gs_ns_ks_lengths,
        const std::vector<index_t>& b_gs_ns_ks_strides,
        const std::vector<index_t>& z_gs_ms_ns_lengths,
        const std::vector<index_t>& z_gs_ms_ns_strides,
        const std::vector<index_t>& b1_gs_gemm1ns_gemm1ks_lengths, // b1_gs_os_ns_lengths
        const std::vector<index_t>& b1_gs_gemm1ns_gemm1ks_strides, // b1_gs_os_ns_strides
        const std::vector<index_t>& c_gs_ms_gemm1ns_lengths,       // c_gs_ms_os_lengths
        const std::vector<index_t>& c_gs_ms_gemm1ns_strides,       // c_gs_ms_os_strides
        const std::vector<index_t>& lse_gs_ms_lengths,
        const std::array<std::vector<ck::index_t>, NumAcc0Bias> acc0_biases_gs_ms_ns_lengths,
        const std::array<std::vector<ck::index_t>, NumAcc0Bias> acc0_biases_gs_ms_ns_strides,
        const std::array<std::vector<ck::index_t>, NumAcc1Bias>
            acc1_biases_gs_ms_gemm1ns_lengths, // acc1_biases_gs_ms_os_lengths
        const std::array<std::vector<ck::index_t>, NumAcc1Bias>
            acc1_biases_gs_ms_gemm1ns_strides, // acc1_biases_gs_ms_os_strides
        AElementwiseOperation a_element_op,
        BElementwiseOperation b_element_op,
        AccElementwiseOperation acc_element_op,
        B1ElementwiseOperation b1_element_op,
        CElementwiseOperation c_element_op,
        float p_drop,
        std::tuple<unsigned long long, unsigned long long> seeds) // override
    {
        return std::make_unique<Argument>(static_cast<const InputDataType*>(p_a),
                                          static_cast<const InputDataType*>(p_b),
                                          static_cast<ZDataType*>(p_z),
                                          static_cast<const InputDataType*>(p_b1),
                                          static_cast<const InputDataType*>(p_c),
                                          static_cast<const LSEDataType*>(p_lse),
                                          static_cast<const InputDataType*>(p_ygrad_grid),
                                          static_cast<OutputDataType*>(p_qgrad_grid),
                                          static_cast<OutputDataType*>(p_kgrad_grid),
                                          static_cast<OutputDataType*>(p_vgrad_grid),
                                          p_acc0_biases, // cast in struct Argument
                                          p_acc1_biases, // cast in struct Argument
                                          a_gs_ms_ks_lengths,
                                          a_gs_ms_ks_strides,
                                          b_gs_ns_ks_lengths,
                                          b_gs_ns_ks_strides,
                                          z_gs_ms_ns_lengths,
                                          z_gs_ms_ns_strides,
                                          b1_gs_gemm1ns_gemm1ks_lengths, // b1_gs_os_ns_lengths
                                          b1_gs_gemm1ns_gemm1ks_strides, // b1_gs_os_ns_strides
                                          c_gs_ms_gemm1ns_lengths,       // c_gs_ms_os_lengths
                                          c_gs_ms_gemm1ns_strides,       // c_gs_ms_os_strides
                                          lse_gs_ms_lengths,
                                          acc0_biases_gs_ms_ns_lengths,
                                          acc0_biases_gs_ms_ns_strides,
                                          acc1_biases_gs_ms_gemm1ns_lengths,
                                          acc1_biases_gs_ms_gemm1ns_strides,
                                          a_element_op,
                                          b_element_op,
                                          acc_element_op,
                                          b1_element_op,
                                          c_element_op,
                                          p_drop,
                                          seeds);
    }

    // polymorphic
    std::unique_ptr<BaseInvoker> MakeInvokerPointer() // override
    {
        return std::make_unique<Invoker>(Invoker{});
    }

    // polymorphic
    std::string GetTypeString() const override
    {
        auto str = std::stringstream();

        // clang-format off
        str << "DeviceBatchedMultiheadAttentionBackward_Xdl_CShuffle_V2"
            << "<"
            << BlockSize << ", "
            << MPerBlock << ", "
            << NPerBlock << ", "
            << KPerBlock << ", "
            << AK1 << ", "
            << BK1 << ", "
            << MPerBlock << ", "
            << Gemm1NPerBlock << ", "
            << Gemm1KPerBlock << ", "
            << B1K1 << ", "
            << getGemmSpecializationString(GemmSpec) << ", "
            << "ASpec" << getTensorSpecializationString(ASpec) << ", "
            << "B0Spec" << getTensorSpecializationString(BSpec) << ", "
            << "B1Spec" << getTensorSpecializationString(B1Spec) << ", "
            << "CSpec" << getTensorSpecializationString(CSpec) << ", "
            << getMaskingSpecializationString(MaskingSpec) << ">";
        // clang-format on

        return str.str();
    }
};

} // namespace device
} // namespace tensor_operation
} // namespace ck
