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

#include "OCLPerfPinnedBufferWriteSpeed.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

#define NUM_SIZES 8
// 256KB, 1 MB, 4MB, 16 MB
static const unsigned int Sizes[NUM_SIZES] = {1024,   4 * 1024, 8 * 1024, 16 * 1024,
                                              262144, 1048576,  4194304,  16777216};

static cl_uint blockedSubtests;

static const unsigned int Iterations[2] = {1, OCLPerfPinnedBufferWriteSpeed::NUM_ITER};
#define NUM_OFFSETS 2
static const unsigned int offsets[NUM_OFFSETS] = {0, 16};
#define NUM_SUBTESTS (1 + NUM_OFFSETS)
OCLPerfPinnedBufferWriteSpeed::OCLPerfPinnedBufferWriteSpeed() {
  _numSubTests = NUM_SIZES * NUM_SUBTESTS * 2;
  blockedSubtests = _numSubTests;
  _numSubTests += NUM_SIZES * NUM_SUBTESTS;
}

OCLPerfPinnedBufferWriteSpeed::~OCLPerfPinnedBufferWriteSpeed() {}

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

extern const char* blkStr[2];

void OCLPerfPinnedBufferWriteSpeed::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;

  context_ = 0;
  cmd_queue_ = 0;
  outBuffer_ = 0;
  persistent = false;
  allocHostPtr = false;
  useHostPtr = false;
  hostMem = NULL;
  alignedMem = NULL;
  alignment = 4096;
  isAMD = false;

  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");
#if 0
        // Get last for default
        platform = platforms[numPlatforms-1];
        for (unsigned i = 0; i < numPlatforms; ++i) {
#endif
    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
    if (num_devices > 0) {
      if (!strcmp(pbuf, "Advanced Micro Devices, Inc.")) {
        isAMD = true;
      }
      // platform = platforms[_platformIndex];
      // break;
    }
#if 0
        }
#endif
    delete platforms;
  }
  /*
   * 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");

  char getVersion[128];
  error_ = _wrapper->clGetPlatformInfo(platform, CL_PLATFORM_VERSION, sizeof(getVersion),
                                       getVersion, NULL);
  CHECK_RESULT(error_ != CL_SUCCESS, "clGetPlatformInfo failed");
  platformVersion[0] = getVersion[7];
  platformVersion[1] = getVersion[8];
  platformVersion[2] = getVersion[9];
  platformVersion[3] = '\0';
  bufSize_ = Sizes[_openTest % NUM_SIZES];

  if (((_openTest / NUM_SIZES) % NUM_SUBTESTS) > 0) {
    useHostPtr = true;
    offset = offsets[((_openTest / NUM_SIZES) % NUM_SUBTESTS) - 1];
  } else if (((_openTest / NUM_SIZES) % NUM_SUBTESTS) == 0) {
    allocHostPtr = true;
  }

  if (_openTest < blockedSubtests) {
    numIter = Iterations[_openTest / (NUM_SIZES * NUM_SUBTESTS)];
  } else {
    numIter = 4 * OCLPerfPinnedBufferWriteSpeed::NUM_ITER / ((_openTest % NUM_SIZES) + 1);
  }

  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;
  if (allocHostPtr) {
    flags |= CL_MEM_ALLOC_HOST_PTR;
  } else if (useHostPtr) {
    flags |= CL_MEM_USE_HOST_PTR;
    hostMem = (char*)malloc(bufSize_ + alignment - 1 + offset);
    CHECK_RESULT(hostMem == 0, "malloc(hostMem) failed");
    alignedMem = (char*)((((intptr_t)hostMem + alignment - 1) & ~(alignment - 1)) + offset);
  }
  inBuffer_ = _wrapper->clCreateBuffer(context_, flags, bufSize_, alignedMem, &error_);
  CHECK_RESULT(inBuffer_ == 0, "clCreateBuffer(inBuffer) failed");
  outBuffer_ = _wrapper->clCreateBuffer(context_, 0, bufSize_, 0, &error_);
  CHECK_RESULT(outBuffer_ == 0, "clCreateBuffer(outBuffer) failed");

  // Force memory to be on GPU if possible
  {
    cl_mem memBuffer = _wrapper->clCreateBuffer(context_, 0, bufSize_, NULL, &error_);
    CHECK_RESULT(memBuffer == 0, "clCreateBuffer(memBuffer) failed");

    _wrapper->clEnqueueCopyBuffer(cmd_queue_, memBuffer, inBuffer_, 0, 0, bufSize_, 0, NULL, NULL);
    _wrapper->clFinish(cmd_queue_);

    _wrapper->clEnqueueCopyBuffer(cmd_queue_, memBuffer, outBuffer_, 0, 0, bufSize_, 0, NULL, NULL);
    _wrapper->clFinish(cmd_queue_);

    _wrapper->clReleaseMemObject(memBuffer);
  }
}

void OCLPerfPinnedBufferWriteSpeed::run(void) {
  CPerfCounter timer;
  void* mem = _wrapper->clEnqueueMapBuffer(cmd_queue_, inBuffer_, CL_TRUE, CL_MAP_WRITE, 0,
                                           bufSize_, 0, NULL, NULL, &error_);
  CHECK_RESULT(error_, "clEnqueueMapBuffer failed");
  cl_bool blocking = (_openTest < blockedSubtests) ? CL_TRUE : CL_FALSE;

  // Warm up
  error_ = _wrapper->clEnqueueWriteBuffer(cmd_queue_, outBuffer_, CL_TRUE, 0, bufSize_, mem, 0,
                                          NULL, NULL);

  CHECK_RESULT(error_, "clEnqueueWriteBuffer failed");

  timer.Reset();
  timer.Start();
  for (unsigned int i = 0; i < numIter; i++) {
    error_ = _wrapper->clEnqueueWriteBuffer(cmd_queue_, outBuffer_, blocking, 0, bufSize_, mem, 0,
                                            NULL, NULL);
    CHECK_RESULT(error_, "clEnqueueWriteBuffer failed");
  }
  if (blocking != CL_TRUE) {
    _wrapper->clFinish(cmd_queue_);
  }
  timer.Stop();
  double sec = timer.GetElapsedTime();

  // Buffer read bandwidth in GB/s
  double perf = ((double)bufSize_ * numIter * (double)(1e-09)) / sec;

  _perfInfo = (float)perf;
  char str[256];
  if (allocHostPtr) {
    SNPRINTF(str, sizeof(str), "ALLOC_HOST_PTR (GB/s)");
  } else if (useHostPtr) {
    SNPRINTF(str, sizeof(str), "off: %4d   USE_HOST_PTR (GB/s)", offset);
  }
  char buf[256];
  SNPRINTF(buf, sizeof(buf), " (%8d bytes) %3s i: %4d %31s ", bufSize_, blkStr[blocking], numIter,
           str);
  testDescString = buf;

  error_ = _wrapper->clEnqueueUnmapMemObject(cmd_queue_, inBuffer_, mem, 0, NULL, NULL);
  CHECK_RESULT(error_, "clEnqueueUnmapMemObject failed");
}

unsigned int OCLPerfPinnedBufferWriteSpeed::close(void) {
  _wrapper->clFinish(cmd_queue_);
  if (inBuffer_) {
    error_ = _wrapper->clReleaseMemObject(inBuffer_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseMemObject(inBuffer_) failed");
  }
  if (outBuffer_) {
    error_ = _wrapper->clReleaseMemObject(outBuffer_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseMemObject(outBuffer_) 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");
  }
  if (hostMem) {
    free(hostMem);
  }

  return _crcword;
}

void OCLPerfPinnedBufferWriteRectSpeed::run(void) {
  CPerfCounter timer;
  void* mem = _wrapper->clEnqueueMapBuffer(cmd_queue_, inBuffer_, CL_TRUE, CL_MAP_READ, 0, bufSize_,
                                           0, NULL, NULL, &error_);
  CHECK_RESULT(error_, "clEnqueueMapBuffer failed");
  size_t width = static_cast<size_t>(sqrt(static_cast<float>(bufSize_)));
  size_t bufOrigin[3] = {0, 0, 0};
  size_t hostOrigin[3] = {0, 0, 0};
  size_t region[3] = {width, width, 1};
  // Clamp iteration count to reduce test run time
  unsigned int testNumIter;
  testNumIter = (numIter < 100 ? numIter : 100);
  cl_bool blocking = (_openTest < blockedSubtests) ? CL_TRUE : CL_FALSE;

  // Skip for 1.0 platforms
  if ((platformVersion[0] == '1') && (platformVersion[2] == '0')) {
    testDescString = " SKIPPED ";
    return;
  }
  // Warm up
  error_ =
      _wrapper->clEnqueueWriteBufferRect(cmd_queue_, outBuffer_, CL_TRUE, bufOrigin, hostOrigin,
                                         region, width, 0, width, 0, mem, 0, NULL, NULL);

  CHECK_RESULT(error_, "clEnqueueReadBufferRect failed");

  timer.Reset();
  timer.Start();
  for (unsigned int i = 0; i < testNumIter; i++) {
    error_ =
        _wrapper->clEnqueueWriteBufferRect(cmd_queue_, outBuffer_, blocking, bufOrigin, hostOrigin,
                                           region, width, 0, width, 0, mem, 0, NULL, NULL);
    CHECK_RESULT(error_, "clEnqueueWriteBufferRect failed");
  }
  if (blocking != CL_TRUE) {
    _wrapper->clFinish(cmd_queue_);
  }
  timer.Stop();
  double sec = timer.GetElapsedTime();

  // Buffer read bandwidth in GB/s
  double perf = ((double)bufSize_ * testNumIter * (double)(1e-09)) / sec;

  _perfInfo = (float)perf;
  char str[256];
  if (allocHostPtr) {
    SNPRINTF(str, sizeof(str), "ALLOC_HOST_PTR (GB/s)");
  } else if (useHostPtr) {
    SNPRINTF(str, sizeof(str), "off: %4d   USE_HOST_PTR (GB/s)", offset);
  }
  char buf[256];
  SNPRINTF(buf, sizeof(buf), " (%8d bytes) %3s i: %4d %31s ", bufSize_, blkStr[blocking],
           testNumIter, str);
  testDescString = buf;

  error_ = _wrapper->clEnqueueUnmapMemObject(cmd_queue_, inBuffer_, mem, 0, NULL, NULL);
  CHECK_RESULT(error_, "clEnqueueUnmapMemObject failed");
}