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

#include "OCLCreateBuffer.h"

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

#include <sstream>
#ifdef __linux__
#include <unistd.h>
#endif

#include "CL/cl.h"

const static size_t MaxSubTests = 1;

OCLCreateBuffer::OCLCreateBuffer() {
  _numSubTests = MaxSubTests;
  failed_ = false;
  maxSize_ = 0;
}

OCLCreateBuffer::~OCLCreateBuffer() {}

void OCLCreateBuffer::open(unsigned int test, char* units, double& conversion,
                           unsigned int deviceId) {
  OCLTestImp::open(test, units, conversion, deviceId);
  CHECK_RESULT((error_ != CL_SUCCESS), "Error opening test");
  testID_ = test;

  size_t size;
  _wrapper->clGetDeviceInfo(devices_[deviceId], CL_DEVICE_MAX_MEM_ALLOC_SIZE, sizeof(cl_ulong),
                            &maxSize_, &size);
//! Workaround out of range issue in Windows 32bit apps
#if defined(_WIN32) && !defined(_WIN64)
  static const size_t MaxSizeLimit = 512 * 1024 * 1024;
  if (maxSize_ > MaxSizeLimit) {
    maxSize_ = MaxSizeLimit;
  }
#endif
#if EMU_ENV
  maxSize_ = 1000;
#endif  // EMU_ENV
  cl_mem buf = NULL;

  // Make sure to use a size that's multiple of 8 (64bit).
  maxSize_ &= 0xFFFFFFFFFFFFFFF8;

  buf = _wrapper->clCreateBuffer(context_, CL_MEM_READ_WRITE, maxSize_, NULL, &error_);
  CHECK_RESULT((error_ != CL_SUCCESS), "clCreateBuffer() failed");

  buffers_.push_back(buf);
}

void OCLCreateBuffer::run(void) {
  CPerfCounter timer;

  cl_ulong pattern = PATTERN_20_64BIT;
  timer.Reset();
  timer.Start();
  error_ = /*_wrapper->*/ clEnqueueFillBuffer(cmdQueues_[_deviceId], buffers_[0], &pattern,
                                              sizeof(pattern), 0, maxSize_, 0, NULL, NULL);
  CHECK_RESULT((error_ != CL_SUCCESS), "clEnqueueFillBuffer() failed");
  _wrapper->clFinish(cmdQueues_[_deviceId]);

  size_t maxSteps = maxSize_;
#ifdef __linux__
  long pages = sysconf(_SC_PHYS_PAGES);
  long page_size = sysconf(_SC_PAGE_SIZE);
  if (maxSteps > (size_t)(pages * page_size / 2)) {
    maxSteps = (size_t)pages * page_size / 2;
  }
#endif
  void* resultBuf = NULL;

  // Reduce the buffer for the step transfers ahead of the allocation,
  // since huge buffers may cause paging and very low performance
  maxSteps /= 16;
  while ((resultBuf = malloc(maxSteps)) == NULL) {
    maxSteps /= 2;
    continue;
  }

  checkResult(maxSteps, resultBuf, PATTERN_20_64BIT);

  memset(resultBuf, PATTERN_2A_08BIT, maxSteps);

  writeBuffer(maxSteps, resultBuf);

  memset(resultBuf, 0x00, maxSteps);
  checkResult(maxSteps, resultBuf, PATTERN_2A_64BIT);

  free(resultBuf);

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

  _perfInfo = (float)sec * 1000.f;
  std::stringstream str;
  str << "Max single alloc (size of ";
  str << maxSize_;
  str << " bytes) ";

  testDescString = str.str();
  str << "Max single read/write (size of ";
  str << maxSize_;
  str << " bytes) create time (ms):";

  testDescString = str.str();
}

void OCLCreateBuffer::checkResult(size_t maxSteps, void* resultBuf, cl_ulong pattern) {
  size_t startPoint = 0;
  while ((startPoint) < maxSize_) {
    cl_event ee;
    size_t readSize = maxSteps;
    if ((startPoint + maxSteps) > maxSize_) {
      readSize = maxSize_ - startPoint;
    }
    error_ = /*wrapper->*/ clEnqueueReadBuffer(cmdQueues_[_deviceId], buffers_[0], CL_FALSE,
                                               startPoint, readSize, resultBuf, 0, NULL, &ee);
    CHECK_RESULT((error_ != CL_SUCCESS), "clEnqueueReadBuffer() failed");
    _wrapper->clFinish(cmdQueues_[_deviceId]);

    size_t err_cnt = 0;
    size_t chk_cnt = readSize / sizeof(cl_ulong);

    cl_ulong* cc = reinterpret_cast<cl_ulong*>(resultBuf);

    for (size_t i = 0; i < chk_cnt; i++) {
      if (cc[i] != pattern) {
        err_cnt++;
      }
    }
    if (err_cnt != 0) {
      error_ = -1;
      CHECK_RESULT((error_ != CL_SUCCESS), "checkResult() failed");
      break;
    }
    startPoint += maxSteps;
  }
}

void OCLCreateBuffer::writeBuffer(size_t maxSteps, void* dataBuf) {
  size_t startPoint = 0;
  while ((startPoint) < maxSize_) {
    cl_event ee;
    size_t writeSize = maxSteps;
    if ((startPoint + maxSteps) > maxSize_) {
      writeSize = maxSize_ - startPoint;
    }
    error_ = /*wrapper->*/ clEnqueueWriteBuffer(cmdQueues_[_deviceId], buffers_[0], CL_FALSE,
                                                startPoint, writeSize, dataBuf, 0, NULL, &ee);
    CHECK_RESULT((error_ != CL_SUCCESS), "clEnqueueWriteBuffer() failed");
    _wrapper->clFinish(cmdQueues_[_deviceId]);
    startPoint += maxSteps;
  }
}

unsigned int OCLCreateBuffer::close(void) { return OCLTestImp::close(); }