/*
 * Copyright (c) Advanced Micro Devices, Inc., or its affiliates.
 *
 * SPDX-License-Identifier: MIT
 */

#include "OCLPerfBufferCopyOverhead.h"

#include <assert.h>
#include <stdio.h>
#include <string.h>

#include <complex>

#include "CL/opencl.h"
#include "Timer.h"

// Quiet pesky warnings
#ifdef WIN_OS
#define SNPRINTF sprintf_s
#else
#define SNPRINTF snprintf
#endif

typedef struct {
  unsigned int iterations;
  int flushEvery;
} testStruct;

static testStruct testList[] = {
    {1, -1},       {1, -1},        {10, 1},         {10, -1},     {100, 1},    {100, 10},
    {100, -1},     {1000, 1},      {1000, 10},      {1000, 100},  {1000, -1},  {10000, 1},
    {10000, 10},   {10000, 100},   {10000, 1000},   {10000, -1},  {100000, 1}, {100000, 10},
    {100000, 100}, {100000, 1000}, {100000, 10000}, {100000, -1},
};

OCLPerfBufferCopyOverhead::OCLPerfBufferCopyOverhead() {
  _numSubTests = 2 * 2 * sizeof(testList) / sizeof(testStruct);
}

OCLPerfBufferCopyOverhead::~OCLPerfBufferCopyOverhead() {}

static void CL_CALLBACK notify_callback(const char* errinfo, const void* private_info, size_t cb,
                                        void* user_data) {}

void OCLPerfBufferCopyOverhead::open(unsigned int test, char* units, double& conversion,
                                     unsigned int deviceId) {
  cl_uint numPlatforms;
  cl_platform_id platform = NULL;
  cl_uint num_devices = 0;
  cl_device_id* devices = NULL;
  cl_device_id device = NULL;
  _crcword = 0;
  conversion = 1.0f;
  _deviceId = deviceId;
  _openTest = test % (sizeof(testList) / sizeof(testStruct));

  context_ = 0;
  cmd_queue_ = 0;
  srcBuffer_ = 0;
  dstBuffer_ = 0;

  error_ = _wrapper->clGetPlatformIDs(0, NULL, &numPlatforms);
  CHECK_RESULT(error_ != CL_SUCCESS, "clGetPlatformIDs failed");
  if (0 < numPlatforms) {
    cl_platform_id* platforms = new cl_platform_id[numPlatforms];
    error_ = _wrapper->clGetPlatformIDs(numPlatforms, platforms, NULL);
    CHECK_RESULT(error_ != CL_SUCCESS, "clGetPlatformIDs failed");
    platform = platforms[_platformIndex];
    char pbuf[100];
    error_ = _wrapper->clGetPlatformInfo(platforms[_platformIndex], CL_PLATFORM_VENDOR,
                                         sizeof(pbuf), pbuf, NULL);
    num_devices = 0;
    /* Get the number of requested devices */
    error_ = _wrapper->clGetDeviceIDs(platforms[_platformIndex], type_, 0, NULL, &num_devices);
    // Runtime returns an error when no GPU devices are present instead of just
    // returning 0 devices
    // CHECK_RESULT(error_ != CL_SUCCESS, "clGetDeviceIDs failed");
    // Choose platform with GPU devices
    delete platforms;
  }

  bufSize_ = 4;

  /*
   * If we could find our platform, use it. If not, die as we need the AMD
   * platform for these extensions.
   */
  CHECK_RESULT(platform == 0, "Couldn't find AMD platform, cannot proceed");

  devices = (cl_device_id*)malloc(num_devices * sizeof(cl_device_id));
  CHECK_RESULT(devices == 0, "no devices");

  /* Get the requested device */
  error_ = _wrapper->clGetDeviceIDs(platform, type_, num_devices, devices, NULL);
  CHECK_RESULT(error_ != CL_SUCCESS, "clGetDeviceIDs failed");

  CHECK_RESULT(_deviceId >= num_devices, "Requested deviceID not available");
  device = devices[_deviceId];

  context_ = _wrapper->clCreateContext(NULL, 1, &device, notify_callback, NULL, &error_);
  CHECK_RESULT(context_ == 0, "clCreateContext failed");

  cmd_queue_ = _wrapper->clCreateCommandQueue(context_, device, 0, NULL);
  CHECK_RESULT(cmd_queue_ == 0, "clCreateCommandQueue failed");

  cl_mem_flags flags = CL_MEM_READ_ONLY;
  sleep = ((test / (sizeof(testList) / sizeof(testStruct))) % 2) > 0;
  if (test >= ((sizeof(testList) / sizeof(testStruct)) * 2)) {
    srcHost = true;
    flags |= CL_MEM_ALLOC_HOST_PTR;
  } else {
    srcHost = false;
  }
  srcBuffer_ = _wrapper->clCreateBuffer(context_, flags, bufSize_, NULL, &error_);
  CHECK_RESULT(srcBuffer_ == 0, "clCreateBuffer(srcBuffer) failed");

  flags = CL_MEM_WRITE_ONLY;
  if (!srcHost) {
    flags |= CL_MEM_ALLOC_HOST_PTR;
  }
  dstBuffer_ = _wrapper->clCreateBuffer(context_, flags, bufSize_, NULL, &error_);
  CHECK_RESULT(dstBuffer_ == 0, "clCreateBuffer(dstBuffer) failed");
}

void OCLPerfBufferCopyOverhead::run(void) {
  CPerfCounter timer;
  cl_event event;
  cl_int eventStatus;
  unsigned int iter = testList[_openTest].iterations;

  // Warm up
  error_ = _wrapper->clEnqueueCopyBuffer(cmd_queue_, srcBuffer_, dstBuffer_, 0, 0, bufSize_, 0,
                                         NULL, NULL);

  CHECK_RESULT(error_, "clEnqueueCopyBuffer failed");
  error_ = _wrapper->clFinish(cmd_queue_);
  CHECK_RESULT(error_, "clFinish failed");

  timer.Reset();
  timer.Start();
  for (unsigned int i = 0; i < iter; i++) {
    error_ = _wrapper->clEnqueueCopyBuffer(cmd_queue_, srcBuffer_, dstBuffer_, 0, 0, bufSize_, 0,
                                           NULL, &event);

    CHECK_RESULT(error_, "clEnqueueCopyBuffer failed");
    if ((testList[_openTest].flushEvery > 0) && (((i + 1) % testList[_openTest].flushEvery) == 0)) {
      if (sleep) {
        _wrapper->clFinish(cmd_queue_);
      } else {
        _wrapper->clFlush(cmd_queue_);
        error_ = _wrapper->clGetEventInfo(event, CL_EVENT_COMMAND_EXECUTION_STATUS, sizeof(cl_int),
                                          &eventStatus, NULL);
        while (eventStatus > 0) {
          error_ = _wrapper->clGetEventInfo(event, CL_EVENT_COMMAND_EXECUTION_STATUS,
                                            sizeof(cl_int), &eventStatus, NULL);
        }
      }
    }
    if (i != (iter - 1)) {
      _wrapper->clReleaseEvent(event);
    }
  }
  if (sleep) {
    _wrapper->clFinish(cmd_queue_);
  } else {
    _wrapper->clFlush(cmd_queue_);
    error_ = _wrapper->clGetEventInfo(event, CL_EVENT_COMMAND_EXECUTION_STATUS, sizeof(cl_int),
                                      &eventStatus, NULL);
    while (eventStatus > 0) {
      error_ = _wrapper->clGetEventInfo(event, CL_EVENT_COMMAND_EXECUTION_STATUS, sizeof(cl_int),
                                        &eventStatus, NULL);
    }
  }
  _wrapper->clReleaseEvent(event);

  timer.Stop();
  double sec = timer.GetElapsedTime();

  // Buffer copy time in us
  double perf = sec * 1000. * 1000. / iter;

  const char* strSrc = NULL;
  const char* strDst = NULL;
  const char* strWait = NULL;
  if (srcHost) {
    strSrc = "host";
    strDst = "dev";
  } else {
    strSrc = "dev";
    strDst = "host";
  }
  if (sleep) {
    strWait = "sleep";
  } else {
    strWait = "spin";
  }
  _perfInfo = (float)perf;
  char buf[256];
  SNPRINTF(buf, sizeof(buf), " %5s, s:%4s d:%4s i:%6d (us) ", strWait, strSrc, strDst, iter);
  testDescString = buf;
}

unsigned int OCLPerfBufferCopyOverhead::close(void) {
  if (srcBuffer_) {
    error_ = _wrapper->clReleaseMemObject(srcBuffer_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseMemObject(srcBuffer_) failed");
  }
  if (dstBuffer_) {
    error_ = _wrapper->clReleaseMemObject(dstBuffer_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseMemObject(dstBuffer_) failed");
  }
  if (cmd_queue_) {
    error_ = _wrapper->clReleaseCommandQueue(cmd_queue_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseCommandQueue failed");
  }
  if (context_) {
    error_ = _wrapper->clReleaseContext(context_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseContext failed");
  }

  return _crcword;
}