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

#include "OCLPerfLDSLatency.h"

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

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

static const unsigned int NUM_SIZES = 5;
// 2k up to 64MB
static const unsigned int Sizes[NUM_SIZES] = {2048, 4096, 8192, 16384, 32768};

// Quiet pesky warnings
#ifdef WIN_OS
#define SNPRINTF sprintf_s
#else
#define SNPRINTF snprintf
#endif
void OCLPerfLDSLatency::genShader() {
  shader_.clear();

  // DO NOT PUBLISH
  // Adopted from SiSoft Sandra 2013's memory latency test
  shader_ +=
      "__kernel\n"
      //"__attribute__((work_group_size_hint(1, 1, 1)))\n"
      "void MemWalker(\n"
      "    global uint * restrict input,\n"
      "    global uint * restrict output,\n"
      "    const uint uCount,  const uint uSize,\n"
      "    const uint uOffset, const int bMem, const uint repeats)\n"
      "{\n"
      "    uint o = uOffset;\n"
      "    uint lid = get_local_id(0);\n"
      "    uint x = lid*o;\n"
      "    local uint lclData[8192];\n"
      "\n"
      "    {\n"
      "        uint i = uCount;\n"
      "        while (i--) {\n"
      "            uint oldX = x;\n"
      "            x = input[x];\n"
      "            lclData[oldX] = x;\n"
      "        }\n"
      "    }\n"
      "\n"
      "    x = lid*uOffset;\n"
      "    for (uint loop = 0; loop < repeats; loop++) {\n"
      "        uint i = uCount;\n"
      "        while (i--) {\n"
      "            x = lclData[x] + o;\n"
      "        }\n"
      "    }\n"
      "\n"
      "    output[0] = x;\n"
      "}\n";

  // printf("shader:\n%s\n", shader_.c_str());
  shader_ += "\n\n";
  shader_ +=
      "__kernel\n"
      //"__attribute__((work_group_size_hint(1, 1, 1)))\n"
      "void Overhead(\n"
      "    global uint * restrict input,\n"
      "    global uint * restrict output,\n"
      "    const uint uCount,  const uint uSize,\n"
      "    const uint uOffset, const int bMem, const uint repeats)\n"
      "{\n"
      "    local uint lclData[8192];\n"
      "#ifdef USE_FLOAT\n"
      "    {\n"
      "        uint x = 0;\n"
      "        uint i = uCount;\n"
      "        while (i--) {\n"
      "            uint oldX = x;\n"
      "            x = input[x] /* + o*/;\n"
      "            lclData[oldX] = x;\n"
      "        }\n"
      "    }\n"
      "    float x = (float)input[0];\n"
      "    for (uint loop = 0; loop < repeats; loop++) {\n"
      "        uint i = uCount;\n"
      "        x = (float)uOffset*x;\n"
      "        while (i--) {\n"
      "            x += (float)i;\n"
      "        }\n"
      "    }\n"
      "    output[0] = (uint)x + uOffset*lclData[8191];\n"
      "#else\n"
      "    {\n"
      "        uint x = 0;\n"
      "        uint i = uCount;\n"
      "        while (i--) {\n"
      "            uint oldX = x;\n"
      "            x = input[x] /* + o*/;\n"
      "            lclData[oldX] = x;\n"
      "        }\n"
      "    }\n"
      "    uint x = input[0];\n"
      "    for (uint loop = 0; loop < repeats; loop++) {\n"
      "        uint i = uCount;\n"
      "        x = x*uOffset;\n"
      "        while (i--) {\n"
      "            x += i;\n"
      "        }\n"
      "    }\n"
      "    output[0] = x + uOffset*lclData[8191];\n"
      "#endif\n"
      "}\n";
}

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

OCLPerfLDSLatency::OCLPerfLDSLatency() {
  _numSubTests = NUM_SIZES * 2;
  maxSize_ = Sizes[NUM_SIZES - 1] * 2048;
}

OCLPerfLDSLatency::~OCLPerfLDSLatency() {}

void OCLPerfLDSLatency::setData(cl_mem buffer, unsigned int val) {
  void* ptr = _wrapper->clEnqueueMapBuffer(cmd_queue_, buffer, true, CL_MAP_WRITE, 0, width_, 0,
                                           NULL, NULL, &error_);
  unsigned int* data = (unsigned int*)ptr;
  for (unsigned int i = 0; i < bufSizeDW_; i++) {
    data[(i * (1024 + 17)) % bufSizeDW_] = ((i + 1) * (1024 + 17)) % bufSizeDW_;
  }
  error_ = _wrapper->clEnqueueUnmapMemObject(cmd_queue_, buffer, ptr, 0, NULL, NULL);
  clFinish(cmd_queue_);
}

void OCLPerfLDSLatency::checkData(cl_mem buffer) {
  void* ptr = _wrapper->clEnqueueMapBuffer(cmd_queue_, buffer, true, CL_MAP_READ, 0,
                                           sizeof(cl_uint), 0, NULL, NULL, &error_);

  unsigned int* data = (unsigned int*)ptr;
  if (data[0] != 0) {
    printf("OutData= 0x%08x\n", data[0]);
    CHECK_RESULT_NO_RETURN(data[0] != 0, "Data validation failed!\n");
  }
  error_ = _wrapper->clEnqueueUnmapMemObject(cmd_queue_, buffer, ptr, 0, NULL, NULL);
}

void OCLPerfLDSLatency::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;
  moreThreads = false;

  context_ = 0;
  cmd_queue_ = 0;
  program_ = 0;
  kernel_ = 0;
  inBuffer_ = 0;
  outBuffer_ = 0;
  _errorFlag = false;  // Reset error code so a single error doesn't prevent
                       // other subtests from running
  _errorMsg = "";
  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");

    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;
      }
    }

    delete platforms;
  }

  width_ = Sizes[test % NUM_SIZES];

  bufSizeDW_ = width_ / sizeof(cl_uint);
  moreThreads = ((test / NUM_SIZES) % 2) ? true : false;

  CHECK_RESULT(platform == 0, "Couldn't find OpenCL platform, cannot proceed");

  devices = (cl_device_id*)malloc(num_devices * sizeof(cl_device_id));
  CHECK_RESULT(devices == 0, "Failed to allocate devices");

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

  device = devices[0];

  free(devices);
  devices = NULL;
  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_uint flags;
  flags = 0;
  inBuffer_ = _wrapper->clCreateBuffer(context_, flags, width_, NULL, &error_);
  CHECK_RESULT(inBuffer_ == 0, "clCreateBuffer(inBuffer) failed");

  outBuffer_ = _wrapper->clCreateBuffer(context_, 0, 1 * sizeof(cl_uint), NULL, &error_);
  CHECK_RESULT(outBuffer_ == 0, "clCreateBuffer(outBuffer) failed");

  genShader();
  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 (isAMD_) args += " -D USE_FLOAT";

  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_, "MemWalker", &error_);
  CHECK_RESULT(kernel_ == 0, "clCreateKernel(MemWalker) failed");

  kernel2_ = _wrapper->clCreateKernel(program_, "Overhead", &error_);
  CHECK_RESULT(kernel2_ == 0, "clCreateKernel(Overhead) 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_uint), (void*)&bufSizeDW_);
  error_ = _wrapper->clSetKernelArg(kernel_, 3, sizeof(cl_uint), (void*)&bufSizeDW_);
  unsigned int zero = 0;
  error_ = _wrapper->clSetKernelArg(kernel_, 4, sizeof(cl_uint), (void*)&zero);
  int bMem = 1;
  error_ = _wrapper->clSetKernelArg(kernel_, 5, sizeof(cl_int), (void*)&bMem);
  // Limit the repeats, large buffers will have more samples, but the test runs
  // for a long time
  repeats_ = std::max((maxSize_ >> 4) / bufSizeDW_, 1u);
  error_ = _wrapper->clSetKernelArg(kernel_, 6, sizeof(cl_uint), (void*)&repeats_);

  error_ = _wrapper->clSetKernelArg(kernel2_, 0, sizeof(cl_mem), (void*)&inBuffer_);
  error_ = _wrapper->clSetKernelArg(kernel2_, 1, sizeof(cl_mem), (void*)&outBuffer_);
  error_ = _wrapper->clSetKernelArg(kernel2_, 2, sizeof(cl_uint), (void*)&bufSizeDW_);
  error_ = _wrapper->clSetKernelArg(kernel2_, 3, sizeof(cl_uint), (void*)&bufSizeDW_);
  error_ = _wrapper->clSetKernelArg(kernel2_, 4, sizeof(cl_uint), (void*)&zero);
  error_ = _wrapper->clSetKernelArg(kernel2_, 5, sizeof(cl_int), (void*)&bMem);
  error_ = _wrapper->clSetKernelArg(kernel2_, 6, sizeof(cl_uint), (void*)&repeats_);

  setData(inBuffer_, (int)1.0f);
}

void OCLPerfLDSLatency::run(void) {
  int global = 1;
  int local = 1;

  if (moreThreads) {
    if (isAMD_) {
      global *= 64;
      local *= 64;
    } else {
      global *= 32;
      local *= 32;
    }
  }
  size_t global_work_size[1] = {(size_t)global};
  size_t local_work_size[1] = {(size_t)local};

  // Warm-up
  unsigned int warmup = 128;
  error_ = _wrapper->clSetKernelArg(kernel_, 2, sizeof(cl_uint), (void*)&warmup);
  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");
  error_ = _wrapper->clSetKernelArg(kernel_, 2, sizeof(cl_uint), (void*)&bufSizeDW_);
  _wrapper->clFinish(cmd_queue_);

  // Restore input buffer when finished as it may have been modified by RW test
  setData(inBuffer_, (int)1.0f);

  CPerfCounter timer, timer2;

  timer.Reset();
  timer.Start();

  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();

  checkData(outBuffer_);

  timer2.Reset();
  timer2.Start();

  error_ = _wrapper->clEnqueueNDRangeKernel(cmd_queue_, kernel2_, 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_);

  timer2.Stop();
  double sec = timer.GetElapsedTime() - timer2.GetElapsedTime();

  // Read latency in ns
  double perf = sec * (double)(1e09) / ((double)bufSizeDW_ * (double)repeats_);

  _perfInfo = (float)perf;
  char buf[256];
  char buf2[32];
  buf2[0] = '\0';
  SNPRINTF(buf, sizeof(buf), "%10s %2d threads, %8d reads, %5d repeats (ns)", buf2, global,
           bufSizeDW_, repeats_);
  testDescString = buf;
}

unsigned int OCLPerfLDSLatency::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 (kernel_) {
    error_ = _wrapper->clReleaseKernel(kernel_);
    CHECK_RESULT_NO_RETURN(error_ != CL_SUCCESS, "clReleaseKernel failed");
  }
  if (kernel2_) {
    error_ = _wrapper->clReleaseKernel(kernel2_);
    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;
}