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The above copyright notice and this permission notice shall be included in
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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THE SOFTWARE.
*/

/**
 * @addtogroup hipMemcpyKernel hipMemcpyKernel
 * @{
 * @ingroup perfMemoryTest
 * `hipMemcpy(void* dst, const void* src, size_t count, hipMemcpyKind kind)` -
 * Copies data between host and device.
 */

#include <hip_test_common.hh>

#define ARRAY_SIZE 16

typedef struct d_uint16 {
  uint data[ARRAY_SIZE];
} d_uint16;

__global__ void write_kernel(d_uint16* dst, ulong N, d_uint16 pval) {
  size_t idx = (blockIdx.x * blockDim.x + threadIdx.x);
  size_t stride = blockDim.x * gridDim.x;
  for (size_t i = idx; i < N; i += stride) {
    dst[i] = pval;
  }
}

static bool hipPerfDevMemWriteSpeed_test() {
  d_uint16 *dDst, *hDst;
  ulong N = 4 * 1024 * 1024;
  uint nBytes = N * sizeof(d_uint16);

  uint inputData = 0xabababab;
  int nIter = 1000;
  d_uint16 pval;

  int deviceId = 0;
  HIP_CHECK(hipSetDevice(deviceId));
  hipDeviceProp_t props;
  HIP_CHECK(hipGetDeviceProperties(&props, deviceId));

  CONSOLE_PRINT("info: running on bus 0x%x %s with %d CUs\n", props.pciBusID, props.name,
                props.multiProcessorCount);

  const unsigned threadsPerBlock = 64;
  const unsigned blocks = props.multiProcessorCount * 4;

  for (int i = 0; i < ARRAY_SIZE; i++) {
    pval.data[i] = inputData;
  }

  hDst = new d_uint16[nBytes];
  REQUIRE(hDst != nullptr);

  for (size_t i = 0; i < N; i++) {
    for (size_t j = 0; j < ARRAY_SIZE; j++) {
      hDst[i].data[j] = 0;
    }
  }

  hipStream_t stream;
  HIP_CHECK(hipStreamCreate(&stream));

  HIP_CHECK(hipMalloc(&dDst, nBytes));
  hipLaunchKernelGGL(write_kernel, dim3(blocks), dim3(threadsPerBlock), 0, stream, dDst, N, pval);
  HIP_CHECK(hipGetLastError());
  HIP_CHECK(hipMemcpy(hDst, dDst, nBytes, hipMemcpyDeviceToHost));
  HIP_CHECK(hipDeviceSynchronize());

  for (uint i = 0; i < N; i++) {
    for (uint j = 0; j < ARRAY_SIZE; j++) {
      if (hDst[i].data[j] != inputData) {
        DEBUG_PRINT(
            "hipPerfDevMemWriteSpeed - Data validation failed for warm up run! at index i: %u "
            "element j: %u expected 0x%x but got 0x%x\n",
            i, j, inputData, hDst[i].data[j]);
        return false;
      }
    }
  }

  // measure performance based on host time
  auto all_start = std::chrono::steady_clock::now();

  for (int i = 0; i < nIter; i++) {
    hipLaunchKernelGGL(write_kernel, dim3(blocks), dim3(threadsPerBlock), 0, stream, dDst, N, pval);
    HIP_CHECK(hipGetLastError());
  }
  HIP_CHECK(hipDeviceSynchronize());

  auto all_end = std::chrono::steady_clock::now();
  std::chrono::duration<double> all_kernel_time = all_end - all_start;

  // read speed in GB/s
  double perf = (static_cast<double>(nBytes * nIter * (1e-09))) / all_kernel_time.count();

  CONSOLE_PRINT(
      "hipPerfDevMemWriteSpeed - average write speed of %.2f GB/s achieved for memory size of %u "
      "MB\n",
      perf, nBytes / (1024 * 1024));

  delete[] hDst;
  HIP_CHECK(hipFree(dDst));
  HIP_CHECK(hipStreamDestroy(stream));
  return true;
}

/**
 * Test Description
 * ------------------------
 *  - Verify hipPerfDevMemWriteSpeed status.
 * Test source
 * ------------------------
 *  - perftests/memory/hipPerfDevMemWriteSpeed.cc
 * Test requirements
 * ------------------------
 *  - HIP_VERSION >= 5.6
 */

TEST_CASE("Perf_hipPerfDevMemWriteSpeed_test") {
  int numDevices = 0;
  HIP_CHECK(hipGetDeviceCount(&numDevices));

  if (numDevices <= 0) {
    SUCCEED(
        "Skipped testcase hipPerfDevMemWriteSpeed as"
        "there is no device to test.");
  } else {
    REQUIRE(true == hipPerfDevMemWriteSpeed_test());
  }
}

/**
 * End doxygen group perfMemoryTest.
 * @}
 */