/***************************************************************************************************
 * Copyright (c) 2017 - 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 * SPDX-License-Identifier: BSD-3-Clause
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 * 1. Redistributions of source code must retain the above copyright notice, this
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 * and/or other materials provided with the distribution.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#pragma once

#include "cuda_runtime.h"
#include <iostream>

/**
 * Panic wrapper for unwinding CUTLASS errors
 */
#define CUTLASS_CHECK(status)                                                                    \
  {                                                                                              \
    cutlass::Status error = status;                                                              \
    if (error != cutlass::Status::kSuccess) {                                                    \
      std::cerr << "Got cutlass error: " << cutlassGetStatusString(error) << " at: " << __LINE__ \
                << std::endl;                                                                    \
      exit(EXIT_FAILURE);                                                                        \
    }                                                                                            \
  }


/**
 * Panic wrapper for unwinding CUDA runtime errors
 */
#define CUDA_CHECK(status)                                              \
  {                                                                     \
    cudaError_t error = status;                                         \
    if (error != cudaSuccess) {                                         \
      std::cerr << "Got bad cuda status: " << cudaGetErrorString(error) \
                << " at line: " << __LINE__ << std::endl;               \
      exit(EXIT_FAILURE);                                               \
    }                                                                   \
  }


/**
 * GPU timer for recording the elapsed time across kernel(s) launched in GPU stream
 */
struct GpuTimer
{
    cudaStream_t _stream_id;
    cudaEvent_t _start;
    cudaEvent_t _stop;

    /// Constructor
    GpuTimer() : _stream_id(0)
    {
        CUDA_CHECK(cudaEventCreate(&_start));
        CUDA_CHECK(cudaEventCreate(&_stop));
    }

    /// Destructor
    ~GpuTimer()
    {
        CUDA_CHECK(cudaEventDestroy(_start));
        CUDA_CHECK(cudaEventDestroy(_stop));
    }

    /// Start the timer for a given stream (defaults to the default stream)
    void start(cudaStream_t stream_id = 0)
    {
        _stream_id = stream_id;
        CUDA_CHECK(cudaEventRecord(_start, _stream_id));
    }

    /// Stop the timer
    void stop()
    {
        CUDA_CHECK(cudaEventRecord(_stop, _stream_id));
    }

    /// Return the elapsed time (in milliseconds)
    float elapsed_millis()
    {
        float elapsed = 0.0;
        CUDA_CHECK(cudaEventSynchronize(_stop));
        CUDA_CHECK(cudaEventElapsedTime(&elapsed, _start, _stop));
        return elapsed;
    }
};