/***************************************************************************************************
 * Copyright (c) 2017 - 2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 **************************************************************************************************/
/*! \file
    \brief Tests for device-wide GEMM interface
*/

#pragma once

#include <iostream>
#include <fstream>
#include <sstream>

#include "../../common/cutlass_unit_test.h"

#include "testbed.h"

namespace test {
namespace gemm {
namespace device {

/////////////////////////////////////////////////////////////////////////////////////////////////

template <typename Gemm>
struct TestbedSplitK : public Testbed<Gemm> {

  using Base = Testbed<Gemm>;

  using ElementCompute = typename Base::ElementCompute;

  //
  // Methods
  //

  TestbedSplitK(
    cutlass::Distribution::Kind init_A_ = cutlass::Distribution::Uniform,
    cutlass::Distribution::Kind init_B_ = cutlass::Distribution::Uniform,
    cutlass::Distribution::Kind init_C_ = cutlass::Distribution::Uniform,
    uint64_t seed_ = 2080
  ):
    Base(init_A_, init_B_, init_C_, seed_) { }

  /// Returns true if the CUDA device is sufficient to execute the kernel.
  bool sufficient() const {
    //
    // Determine SMEM requirements and waive if not satisfied
    //

    int smem_size = int(sizeof(typename Gemm::GemmKernel::SharedStorage));

    cudaDeviceProp properties;
    int device_idx;
    cudaError_t result = cudaGetDevice(&device_idx);

    if (result != cudaSuccess) {
      throw std::runtime_error("cudaGetDevice() API call failed.");
    }

    result = cudaGetDeviceProperties(&properties, device_idx);

    if (result != cudaSuccess) {
      throw std::runtime_error("cudaGetDeviceProperties() failed");
    }

    if (properties.sharedMemPerMultiprocessor < smem_size) {
      return false;
    }

    return true;
  }
  
  /// Executes one test
  bool run(
    cutlass::gemm::GemmCoord problem_size, 
    int split_k_slices,
    ElementCompute alpha = ElementCompute(1), 
    ElementCompute beta = ElementCompute(0)) {

    // Waive test if insufficient CUDA device
    if (!sufficient()) {
      if (CUTLASS_TEST_UNIT_ENABLE_WARNINGS) {
        std::cerr << "Test waived due to insufficient CUDA device." << std::endl;
      }
      return true;
    }

    this->initialize(problem_size);

    //
    // Initialize the GEMM operator
    //

    typename Gemm::Arguments arguments{
      problem_size,
      this->tensor_A.device_ref(),
      this->tensor_B.device_ref(),
      this->tensor_C.device_ref(),
      this->tensor_D.device_ref(),
      {alpha, beta},
      split_k_slices
    };

    Gemm gemm_op;

    size_t workspace_size = Gemm::get_workspace_size(arguments);

    cutlass::device_memory::allocation<uint8_t> workspace(workspace_size);

    cutlass::Status status = gemm_op.initialize(arguments, workspace.get());

    EXPECT_TRUE(status == cutlass::Status::kSuccess);

    //
    // Run the GEMM
    //

    status = gemm_op();

    EXPECT_TRUE(status == cutlass::Status::kSuccess);

    //
    // Verify
    //

    return this->verify(problem_size, alpha, beta);
  }
};

/////////////////////////////////////////////////////////////////////////////////////////////////

template <typename Gemm>
bool TestAllGemmSplitK() {
  bool passed = true;

  cutlass::gemm::GemmCoord problem_sizes[] = {
    {8, 8, 2048},
    {8, 8, 2056},
    {264, 72, 520},
    {264, 520,  120},
    {264, 520,  264}
  };

  int split_k_slices[] = {
    1, 2, 4, 5, 7
  };

  double problem_alpha[] = {
    0.5
  };

  double problem_beta[] = {
    2.0
  };

  using Testbed = TestbedSplitK<Gemm>;
  using ElementCompute = typename Testbed::ElementCompute;

  Testbed testbed;

  for (auto problem_size : problem_sizes) {
    for (int split_k_count : split_k_slices) {
      for (double alpha : problem_alpha) {
        for (double beta : problem_beta) {

          passed = testbed.run(
            problem_size, 
            split_k_count,
            ElementCompute(alpha), 
            ElementCompute(beta)
          );

          if (!passed) {
            std::cout << "Failed on size " << problem_size << " with split_k_count " << split_k_count << std::endl;
            return false;
          }
        }
      }
    }
  }

  EXPECT_TRUE(passed);

  return passed;
}

/////////////////////////////////////////////////////////////////////////////////////////////////

} // namespace device
} // namespace gemm
} // namespace test

/////////////////////////////////////////////////////////////////////////////////////////////////