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

#include "OCLPerfUAVReadSpeedHostMem.h"

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

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

const unsigned int NUM_SIZES = 4;
const unsigned int NUM_READ_MODES = 1;
const unsigned int MAX_READ_MODES = 1;

static const unsigned int NumReads[NUM_READ_MODES] = {1};
// 256KB, 1 MB, 4MB, 16 MB and 64 MB
static const unsigned int Sizes[NUM_SIZES] = {262144, 1048576, 4194304, 16777216};
static const unsigned int MaxTypes = 2;
static unsigned int NumTypes = MaxTypes;
static const char* types[MaxTypes] = {"float", "double"};
static const unsigned int TypeSize[MaxTypes] = {sizeof(cl_float), sizeof(cl_double)};
static const unsigned int NumVecWidths = 5;
static const char* vecWidths[NumVecWidths] = {"", "2", "4", "8", "16"};
#define CHAR_BUF_SIZE 512

// Quiet pesky warnings
#ifdef WIN_OS
#define SNPRINTF sprintf_s
#else
#define SNPRINTF snprintf
#endif
void OCLPerfUAVReadSpeedHostMem::genShader(unsigned int type, unsigned int vecWidth,
                                           unsigned int numReads) {
  char buf[CHAR_BUF_SIZE];

  shader_.clear();
  shader_ +=
      "#ifdef USE_AMD_DOUBLES\n"
      "#pragma OPENCL EXTENSION cl_amd_fp64 : enable\n"
      "#endif\n";
  shader_ +=
      "#ifdef USE_KHR_DOUBLES\n"
      "#pragma OPENCL EXTENSION cl_khr_fp64 : enable\n"
      "#endif\n";
  SNPRINTF(buf, CHAR_BUF_SIZE,
           "__kernel void _uavReadSpeedHostMem(__global %s%s *inBuf, __global "
           "%s%s *outBuf, constant uint *constBuf)\n",
           types[type], vecWidths[vecWidth], types[type], vecWidths[vecWidth]);
  shader_.append(buf);
  shader_ +=
      "{\n"
      "    int i = (int) get_global_id(0);\n";
  SNPRINTF(buf, CHAR_BUF_SIZE, "    %s%s temp = 0;\n", types[type], vecWidths[vecWidth]);
  shader_.append(buf);
  shader_ += "    temp = *(inBuf + i);\n";
  if (vecWidth == 0) {
    shader_ +=
        "    if (temp < 0)\n"
        "        *(outBuf + i) = temp;\n"
        "}\n";
  } else {
    shader_ +=
        "    if (temp.s0 < 0)\n"
        "        *(outBuf + i) = temp;\n"
        "}\n";
  }
  // printf("shader:\n%s\n", shader_.c_str());
}

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

OCLPerfUAVReadSpeedHostMem::OCLPerfUAVReadSpeedHostMem() {
  cl_uint numPlatforms;
  cl_platform_id platform = NULL;
  cl_uint num_devices = 0;
  cl_device_id* devices = NULL;
  cl_device_id device = NULL;
  context_ = 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");
    // Get last for default
    platform = platforms[numPlatforms - 1];
    for (unsigned i = 0; i < numPlatforms; ++i) {
      char pbuf[100];
      error_ =
          _wrapper->clGetPlatformInfo(platforms[i], CL_PLATFORM_VENDOR, sizeof(pbuf), pbuf, NULL);
      num_devices = 0;
      /* Get the number of requested devices */
      error_ = _wrapper->clGetDeviceIDs(platforms[i], 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) {
        platform = platforms[i];
        break;
      }
    }
    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");

  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");

  char charbuf[1024];
  size_t retsize;
  error_ = _wrapper->clGetDeviceInfo(device, CL_DEVICE_EXTENSIONS, 1024, charbuf, &retsize);
  CHECK_RESULT(error_ != CL_SUCCESS, "clGetDeviceInfo failed");

  char* p = strstr(charbuf, "cl_khr_fp64");
  char* p2 = strstr(charbuf, "cl_amd_fp64");

  NumTypes = MaxTypes;

  if (!p && !p2) {
    // Doubles not supported
    NumTypes--;
  }
  _numSubTests = NumTypes * NumVecWidths * NUM_SIZES * MAX_READ_MODES;
  if (context_) {
    error_ = _wrapper->clReleaseContext(context_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseContext failed");
  }
}

OCLPerfUAVReadSpeedHostMem::~OCLPerfUAVReadSpeedHostMem() {}

void OCLPerfUAVReadSpeedHostMem::setData(cl_mem buffer, float val) {
  float* data = (float*)_wrapper->clEnqueueMapBuffer(cmd_queue_, buffer, true, CL_MAP_WRITE, 0,
                                                     bufSize_, 0, NULL, NULL, &error_);
  for (unsigned int i = 0; i < (bufSize_ >> 2); i++) data[i] = val;
  error_ = _wrapper->clEnqueueUnmapMemObject(cmd_queue_, buffer, data, 0, NULL, NULL);
}

void OCLPerfUAVReadSpeedHostMem::checkData(cl_mem buffer) {
  float* data = (float*)_wrapper->clEnqueueMapBuffer(cmd_queue_, buffer, true, CL_MAP_READ, 0,
                                                     bufSize_, 0, NULL, NULL, &error_);
  for (unsigned int i = 0; i < (bufSize_ >> 2); i++) {
    if (data[i] != (float)numReads_) {
      printf("Data validation failed at index %d!\n", i);
      printf("Expected %d %d %d %d\nGot %d %d %d %d\n", numReads_, numReads_, numReads_, numReads_,
             (unsigned int)data[i], (unsigned int)data[i + 1], (unsigned int)data[i + 2],
             (unsigned int)data[i + 3]);
      CHECK_RESULT_NO_RETURN(0, "Data validation failed!\n");
      break;
    }
  }
  error_ = _wrapper->clEnqueueUnmapMemObject(cmd_queue_, buffer, data, 0, NULL, NULL);
}

void OCLPerfUAVReadSpeedHostMem::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;

  context_ = 0;
  cmd_queue_ = 0;
  program_ = 0;
  kernel_ = 0;
  inBuffer_ = 0;
  outBuffer_ = 0;
  constBuffer_ = 0;
  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;
  }

  numReads_ = NumReads[test % MAX_READ_MODES];
  width_ = Sizes[(test / MAX_READ_MODES) % NUM_SIZES];
  vecSizeIdx_ = (test / (MAX_READ_MODES * NUM_SIZES)) % NumVecWidths;
  typeIdx_ = (test / (MAX_READ_MODES * NUM_SIZES * NumVecWidths)) % NumTypes;
  cached_ = true;

  bufSize_ = width_;

  /*
   * 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");

  device = devices[0];

  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");

  inBuffer_ = _wrapper->clCreateBuffer(context_, CL_MEM_READ_ONLY | CL_MEM_ALLOC_HOST_PTR, bufSize_,
                                       NULL, &error_);
  CHECK_RESULT(inBuffer_ == 0, "clCreateBuffer(inBuffer) failed");

  outBuffer_ = _wrapper->clCreateBuffer(context_, 0, bufSize_, NULL, &error_);
  CHECK_RESULT(outBuffer_ == 0, "clCreateBuffer(outBuffer) failed");

  constBuffer_ = _wrapper->clCreateBuffer(context_, 0, 16 * 2, NULL, &error_);
  CHECK_RESULT(constBuffer_ == 0, "clCreateBuffer(constBuffer) failed");

  genShader(typeIdx_, vecSizeIdx_, numReads_);
  char* tmp = (char*)shader_.c_str();
  program_ = _wrapper->clCreateProgramWithSource(context_, 1, (const char**)&tmp, NULL, &error_);
  CHECK_RESULT(program_ == 0, "clCreateProgramWithSource failed");

  std::string args;
  args.clear();
  if (cached_ && isAMD) {
    args = "-fno-alias ";
  }
  if (typeIdx_ == 1) {
    if (isAMD) {
      args += "-D USE_AMD_DOUBLES ";
    } else {
      args += "-D USE_KHR_DOUBLES ";
    }
  }
  error_ = _wrapper->clBuildProgram(program_, 1, &device, args.c_str(), NULL, NULL);

  if (error_ != CL_SUCCESS) {
    cl_int intError;
    char log[16384];
    intError = _wrapper->clGetProgramBuildInfo(program_, device, CL_PROGRAM_BUILD_LOG,
                                               16384 * sizeof(char), log, NULL);
    printf("Build error -> %s\n", log);

    CHECK_RESULT(0, "clBuildProgram failed");
  }
  kernel_ = _wrapper->clCreateKernel(program_, "_uavReadSpeedHostMem", &error_);
  CHECK_RESULT(kernel_ == 0, "clCreateKernel failed");

  error_ = _wrapper->clSetKernelArg(kernel_, 0, sizeof(cl_mem), (void*)&inBuffer_);
  error_ = _wrapper->clSetKernelArg(kernel_, 1, sizeof(cl_mem), (void*)&outBuffer_);
  error_ = _wrapper->clSetKernelArg(kernel_, 2, sizeof(cl_mem), (void*)&constBuffer_);

  setData(inBuffer_, 0.0f);
  setData(outBuffer_, 1.2345678f);
  unsigned int* cBuf = (unsigned int*)_wrapper->clEnqueueMapBuffer(
      cmd_queue_, constBuffer_, true, CL_MAP_WRITE, 0, 16 * 2, 0, NULL, NULL, &error_);
  cBuf[0] = bufSize_ / (TypeSize[typeIdx_] * (1 << vecSizeIdx_));
  cBuf[1] = 0;
  cBuf[2] = 1024;
  cBuf[3] = 2048;
  cBuf[4] = 3072;
  cBuf[5] = 0;
  error_ = _wrapper->clEnqueueUnmapMemObject(cmd_queue_, constBuffer_, cBuf, 0, NULL, NULL);
  _wrapper->clFinish(cmd_queue_);
}

void OCLPerfUAVReadSpeedHostMem::run(void) {
  int global = bufSize_ / (TypeSize[typeIdx_] * (1 << vecSizeIdx_));
  int local = 64;

  size_t global_work_size[1] = {(size_t)global};
  size_t local_work_size[1] = {(size_t)local};

  CPerfCounter timer;

  timer.Reset();
  timer.Start();
  for (unsigned int i = 0; i < NUM_ITER; i++) {
    error_ = _wrapper->clEnqueueNDRangeKernel(cmd_queue_, kernel_, 1, NULL,
                                              (const size_t*)global_work_size,
                                              (const size_t*)local_work_size, 0, NULL, NULL);

    CHECK_RESULT(error_, "clEnqueueNDRangeKernel failed");
  }
  _wrapper->clFinish(cmd_queue_);

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

  // Constant bandwidth in GB/s
  double perf = ((double)bufSize_ * numReads_ * NUM_ITER * (double)(1e-09)) / sec;

  _perfInfo = (float)perf;
  char buf[256];
  char buf2[256];
  SNPRINTF(buf, sizeof(buf), "%s%s", types[typeIdx_], vecWidths[vecSizeIdx_]);
  SNPRINTF(buf2, sizeof(buf2), " %-8s (%8d) (GB/s) ", buf, width_);
  testDescString = buf2;
  // Test doesn't write anything
  // checkData(outBuffer_);
}

unsigned int OCLPerfUAVReadSpeedHostMem::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 (constBuffer_) {
    error_ = _wrapper->clReleaseMemObject(constBuffer_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseMemObject(constBuffer_) failed");
  }
  if (kernel_) {
    error_ = _wrapper->clReleaseKernel(kernel_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseKernel failed");
  }
  if (program_) {
    error_ = _wrapper->clReleaseProgram(program_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseProgram 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;
}
