/*! \file */
/* ************************************************************************
 * Copyright (C) 2020-2024 Advanced Micro Devices, Inc. All rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * ************************************************************************ */

#include "bsrmm_device_large_ext.h"
#include "utility.h"

namespace rocsparse
{
    template <rocsparse_int BSR_BLOCK_DIM,
              rocsparse_int BLK_SIZE_Y,
              rocsparse_int UNROLL_SIZE_Y,
              typename T,
              typename U>
    ROCSPARSE_KERNEL(BSR_BLOCK_DIM* BLK_SIZE_Y)
    void bsrmm_large_blockdim_kernel_ext(rocsparse_direction direction,
                                         rocsparse_operation trans_B,
                                         rocsparse_int       mb,
                                         rocsparse_int       n,
                                         U                   alpha_device_host,
                                         const rocsparse_int* __restrict__ bsr_row_ptr,
                                         const rocsparse_int* __restrict__ bsr_col_ind,
                                         const T* __restrict__ bsr_val,
                                         rocsparse_int block_dim,
                                         const T* __restrict__ B,
                                         int64_t ldb,
                                         U       beta_device_host,
                                         T* __restrict__ C,
                                         int64_t              ldc,
                                         rocsparse_index_base idx_base)
    {
        const auto alpha = rocsparse::load_scalar_device_host(alpha_device_host);
        const auto beta  = rocsparse::load_scalar_device_host(beta_device_host);

        if(alpha == static_cast<T>(0) && beta == static_cast<T>(1))
        {
            return;
        }

        rocsparse::bsrmm_large_blockdim_device_ext<BSR_BLOCK_DIM, BLK_SIZE_Y, UNROLL_SIZE_Y>(
            direction,
            trans_B,
            mb,
            n,
            alpha,
            bsr_row_ptr,
            bsr_col_ind,
            bsr_val,
            block_dim,
            B,
            ldb,
            beta,
            C,
            ldc,
            idx_base);
    }

    typedef enum
    {
        large_config_ext_4_16 = 1,
        large_config_ext_8_8,
        large_config_ext_16_16,
        large_config_ext_32_32
    } enum_large_config_ext;

    //
    // Select which tuned kernel to apply.
    //
    static enum_large_config_ext get_large_config_ext(rocsparse_int block_dim, rocsparse_int n)
    {
        if(block_dim <= 4)
        {
            return large_config_ext_4_16;
        }
        else if(block_dim <= 8)
        {
            return large_config_ext_8_8;
        }
        else if(block_dim <= 16)
        {
            return large_config_ext_16_16;
        }
        else
        {
            rocsparse_host_assert(block_dim <= 32, "Wrong logical dispatch.");
            return large_config_ext_32_32;
        }
    }

    template <typename T, typename U>
    rocsparse_status bsrmm_template_large_ext(rocsparse_handle          handle,
                                              rocsparse_direction       dir,
                                              rocsparse_operation       trans_A,
                                              rocsparse_operation       trans_B,
                                              rocsparse_int             mb,
                                              rocsparse_int             n,
                                              rocsparse_int             kb,
                                              rocsparse_int             nnzb,
                                              U                         alpha,
                                              const rocsparse_mat_descr descr,
                                              const T*                  bsr_val,
                                              const rocsparse_int*      bsr_row_ptr,
                                              const rocsparse_int*      bsr_col_ind,
                                              rocsparse_int             block_dim,
                                              const T*                  B,
                                              int64_t                   ldb,
                                              U                         beta,
                                              T*                        C,
                                              int64_t                   ldc)
    {
        hipStream_t stream = handle->stream;
        rocsparse_host_assert(block_dim <= 32, "This function is designed for block_dim <= 32.");

#define LAUNCH_LARGE_KERNEL(M_, N_, K_)                                                          \
    const dim3 bsrmm_blocks((mb - 1) / 1 + 1, (n - 1) / (N_ * K_) + 1);                          \
    const dim3 bsrmm_threads(M_, N_);                                                            \
    RETURN_IF_HIPLAUNCHKERNELGGL_ERROR((rocsparse::bsrmm_large_blockdim_kernel_ext<M_, N_, K_>), \
                                       bsrmm_blocks,                                             \
                                       bsrmm_threads,                                            \
                                       0,                                                        \
                                       stream,                                                   \
                                       dir,                                                      \
                                       trans_B,                                                  \
                                       mb,                                                       \
                                       n,                                                        \
                                       alpha,                                                    \
                                       bsr_row_ptr,                                              \
                                       bsr_col_ind,                                              \
                                       bsr_val,                                                  \
                                       block_dim,                                                \
                                       B,                                                        \
                                       ldb,                                                      \
                                       beta,                                                     \
                                       C,                                                        \
                                       ldc,                                                      \
                                       descr->base)

        //
        // Select which tuned kernel to apply.
        //
        const enum_large_config_ext config = rocsparse::get_large_config_ext(block_dim, n);
        switch(config)
        {
#define DEFINE_CASE(i, j, k, l)       \
    case i:                           \
    {                                 \
        LAUNCH_LARGE_KERNEL(j, k, l); \
        break;                        \
    }

            DEFINE_CASE(large_config_ext_8_8, 8, 8, 2);
            DEFINE_CASE(large_config_ext_4_16, 4, 16, 2);
            DEFINE_CASE(large_config_ext_16_16, 16, 16, 2);
            DEFINE_CASE(large_config_ext_32_32, 32, 32, 2);

#undef DEFINE_CASE
        }

#undef LAUNCH_LARGE_KERNEL
        return rocsparse_status_success;
    }
}

#define INSTANTIATE(real_type_, scalar_type_)                      \
    template rocsparse_status rocsparse::bsrmm_template_large_ext( \
        rocsparse_handle          handle,                          \
        rocsparse_direction       dir,                             \
        rocsparse_operation       trans_A,                         \
        rocsparse_operation       trans_B,                         \
        rocsparse_int             mb,                              \
        rocsparse_int             n,                               \
        rocsparse_int             kb,                              \
        rocsparse_int             nnzb,                            \
        scalar_type_              alpha,                           \
        const rocsparse_mat_descr descr,                           \
        const real_type_*         bsr_val,                         \
        const rocsparse_int*      bsr_row_ptr,                     \
        const rocsparse_int*      bsr_col_ind,                     \
        rocsparse_int             block_dim,                       \
        const real_type_*         B,                               \
        int64_t                   ldb,                             \
        scalar_type_              beta,                            \
        real_type_*               C,                               \
        int64_t                   ldc)

INSTANTIATE(float, float);
INSTANTIATE(float, const float*);

INSTANTIATE(double, double);
INSTANTIATE(double, const double*);

INSTANTIATE(rocsparse_float_complex, rocsparse_float_complex);
INSTANTIATE(rocsparse_float_complex, const rocsparse_float_complex*);

INSTANTIATE(rocsparse_double_complex, rocsparse_double_complex);
INSTANTIATE(rocsparse_double_complex, const rocsparse_double_complex*);

#undef INSTANTIATE
