/*
 * Copyright (c) 2020 Arm Limited.
 *
 * SPDX-License-Identifier: MIT
 *
 * 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 "arm_compute/core/CL/gemm/reshaped_only_rhs/CLGEMMReshapedOnlyRHSKernelConfigurationValhall.h"

#include "arm_compute/core/CL/CLHelpers.h"
#include "arm_compute/core/CL/CLKernelLibrary.h"
#include "arm_compute/core/CL/gemm/CLGEMMHelpers.h"
#include "arm_compute/core/GPUTarget.h"
#include "arm_compute/core/TensorInfo.h"
#include "arm_compute/core/TensorShape.h"
#include "arm_compute/core/utils/misc/ShapeCalculator.h"

#include <map>
#include <utility>

namespace arm_compute
{
namespace cl_gemm
{
using namespace arm_compute::misc::shape_calculator;

CLGEMMReshapedOnlyRHSKernelConfigurationValhall::CLGEMMReshapedOnlyRHSKernelConfigurationValhall(GPUTarget gpu)
    : ICLGEMMKernelConfiguration(gpu)
{
}

std::pair<GEMMLHSMatrixInfo, GEMMRHSMatrixInfo> CLGEMMReshapedOnlyRHSKernelConfigurationValhall::configure(unsigned int m, unsigned int n, unsigned int k, unsigned int b, DataType data_type)
{
    using ConfigurationFunctionExecutorPtr = std::pair<GEMMLHSMatrixInfo, GEMMRHSMatrixInfo> (CLGEMMReshapedOnlyRHSKernelConfigurationValhall::*)(unsigned int m, unsigned int n, unsigned int k,
                                             unsigned int b);

    // Configurations for Mali-G77
    static std::map<DataType, ConfigurationFunctionExecutorPtr> gemm_configs_G77 =
    {
        { DataType::F32, &CLGEMMReshapedOnlyRHSKernelConfigurationValhall::configure_G77_f32 },
        { DataType::F16, &CLGEMMReshapedOnlyRHSKernelConfigurationValhall::configure_G77_f16 },
        { DataType::QASYMM8, &CLGEMMReshapedOnlyRHSKernelConfigurationValhall::configure_G77_u8 },
        { DataType::QSYMM8, &CLGEMMReshapedOnlyRHSKernelConfigurationValhall::configure_G77_u8 },
        { DataType::QASYMM8_SIGNED, &CLGEMMReshapedOnlyRHSKernelConfigurationValhall::configure_G77_u8 },
        { DataType::QSYMM8_PER_CHANNEL, &CLGEMMReshapedOnlyRHSKernelConfigurationValhall::configure_G77_u8 }
    };

    switch(_target)
    {
        case GPUTarget::G77:
        default:
            if(gemm_configs_G77.find(data_type) != gemm_configs_G77.end())
            {
                return (this->*gemm_configs_G77[data_type])(m, n, k, b);
            }
            else
            {
                ARM_COMPUTE_ERROR("Not supported data type");
            }
    }
}

std::pair<GEMMLHSMatrixInfo, GEMMRHSMatrixInfo> CLGEMMReshapedOnlyRHSKernelConfigurationValhall::configure_G77_f32(unsigned int m, unsigned int n, unsigned int k, unsigned int b)
{
    ARM_COMPUTE_UNUSED(k);

    GEMMLHSMatrixInfo lhs_info_buf;
    GEMMRHSMatrixInfo rhs_info_buf;
    GEMMLHSMatrixInfo lhs_info_img;
    GEMMRHSMatrixInfo rhs_info_img;

    // Get lhs_info/rhs_info in case of OpenCL buffer
    if(m == 1)
    {
        const unsigned int h0 = std::max(n / 4, 1U);
        std::tie(lhs_info_buf, rhs_info_buf) = configure_lhs_rhs_info(m, n, 1, 4, 4, 1, h0, false, true, false, true);
    }
    else
    {
        if(m > 256)
        {
            const int v0 = std::max(std::min(static_cast<int>(n / 4), static_cast<int>(8)), static_cast<int>(1));
            std::tie(lhs_info_buf, rhs_info_buf) = configure_lhs_rhs_info(m, n, 4, 4, 4, 1, v0, false, true, false, true);
        }
        else
        {
            const int v0 = std::max(std::min(static_cast<int>(n / 4), static_cast<int>(8)), static_cast<int>(1));
            std::tie(lhs_info_buf, rhs_info_buf) = configure_lhs_rhs_info(m, n, 2, 4, 4, 1, v0, false, true, false, true);
        }
    }

    // Get lhs_info/rhs_info in case of OpenCL image
    if(m == 1)
    {
        std::tie(lhs_info_img, rhs_info_img) = configure_lhs_rhs_info(m, n, 1, 4, 4, 1, 8, true, true, false, false, true);
    }
    else
    {
        if((m / 4) * (n / 4) > 4096)
        {
            const int h0 = std::max(std::min(static_cast<int>(n / 4), static_cast<int>(8)), static_cast<int>(1));
            std::tie(lhs_info_img, rhs_info_img) = configure_lhs_rhs_info(m, n, 4, 4, 4, 1, h0, false, true, false, false, true);
        }
        else
        {
            const int h0 = std::max(std::min(static_cast<int>(n / 4), static_cast<int>(8)), static_cast<int>(1));
            std::tie(lhs_info_img, rhs_info_img) = configure_lhs_rhs_info(m, n, 2, 4, 4, 1, h0, false, true, false, false, true);
        }
    }

    const TensorInfo  tensor_rhs_info(TensorShape(n, k, b), 1, DataType::F32);
    const TensorShape shape = compute_rhs_reshaped_shape(tensor_rhs_info, rhs_info_img);
    const TensorInfo  tensor_reshaped_info(shape, 1, DataType::F32);

    // In case of small workloads, we use the OpenCL buffer rather than the OpenCL image2d
    const bool use_cl_image2d = ((m / lhs_info_img.m0) * (n / rhs_info_img.n0)) * b < 1024 ? false : true;

    if(bool(validate_image2d_support_on_rhs(tensor_reshaped_info, rhs_info_img)) && use_cl_image2d)
    {
        return std::make_pair(lhs_info_img, rhs_info_img);
    }
    else
    {
        return std::make_pair(lhs_info_buf, rhs_info_buf);
    }
}

std::pair<GEMMLHSMatrixInfo, GEMMRHSMatrixInfo> CLGEMMReshapedOnlyRHSKernelConfigurationValhall::configure_G77_f16(unsigned int m, unsigned int n, unsigned int k, unsigned int b)
{
    ARM_COMPUTE_UNUSED(k);
    ARM_COMPUTE_UNUSED(b);

    if(m == 1)
    {
        if(n > 2048)
        {
            const unsigned int h0 = std::max(n / 4, 1U);
            return configure_lhs_rhs_info(m, n, 1, 4, 4, 1, h0, false, true, false, true);
        }
        else
        {
            const unsigned int h0 = std::max(n / 2, 1U);
            return configure_lhs_rhs_info(m, n, 1, 2, 8, 1, h0, false, true, false, true);
        }
    }
    else if(m < 128)
    {
        const int h0 = std::max(std::min(static_cast<int>(n / 4), static_cast<int>(256)), static_cast<int>(1));
        if(k >= 512)
        {
            return configure_lhs_rhs_info(m, n, 2, 4, 16, 1, h0, false, true, false, false);
        }
        else
        {
            return configure_lhs_rhs_info(m, n, 2, 4, 8, 1, h0, false, true, false, false);
        }
    }
    else
    {
        const int h0 = std::max(std::min(static_cast<int>(n / 4), static_cast<int>(256)), static_cast<int>(1));
        if(n >= 64)
        {
            return configure_lhs_rhs_info(m, n, 4, 4, 4, 1, h0, false, true, false, false);
        }
        else
        {
            if(k >= 512)
            {
                return configure_lhs_rhs_info(m, n, 2, 4, 16, 1, h0, false, true, false, false);
            }
            else
            {
                return configure_lhs_rhs_info(m, n, 2, 4, 8, 1, h0, false, true, false, false);
            }
        }
    }
}

std::pair<GEMMLHSMatrixInfo, GEMMRHSMatrixInfo> CLGEMMReshapedOnlyRHSKernelConfigurationValhall::configure_G77_u8(unsigned int m, unsigned int n, unsigned int k, unsigned int b)
{
    ARM_COMPUTE_UNUSED(k);
    ARM_COMPUTE_UNUSED(b);

    if(m == 1)
    {
        const unsigned int h0 = std::max(n / 2, 1U);
        return configure_lhs_rhs_info(m, n, 1, 4, 16, 1, h0, false, true, false, true);
    }
    else
    {
        const int h0 = std::max(std::min(static_cast<int>(n / 4), static_cast<int>(256)), static_cast<int>(1));
        if(m >= 28)
        {
            return configure_lhs_rhs_info(m, n, 4, 4, 16, 1, h0, false, true, false, true);
        }
        else
        {
            return configure_lhs_rhs_info(m, n, 2, 4, 16, 1, h0, false, true, false, true);
        }
    }
}
} // namespace cl_gemm
} // namespace arm_compute
