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The above copyright notice and this permission notice shall be included in
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
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__ static void read_kernel(d_uint16 *src, ulong N, uint *dst) {
  size_t idx = (blockIdx.x * blockDim.x + threadIdx.x);
  size_t stride = blockDim.x * gridDim.x;

  uint tmp = 0;
  for (size_t i = idx; i < N; i += stride) {
    for (size_t j = 0; j < ARRAY_SIZE; j++) {
      tmp += src[i].data[j];
    }
  }

  atomicAdd(dst, tmp);
}

static bool hipPerfDevMemReadSpeed_test() {
  d_uint16 *dSrc, *hSrc;
  uint *dDst, *hDst;
  hipStream_t stream;
  ulong N = 4 * 1024 * 1024;
  uint nBytes = N * sizeof(d_uint16);

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

  INFO("info: running on bus " << "0x" << props.pciBusID << " " <<
       props.name << " with " << props.multiProcessorCount << " CUs \n");

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

  uint inputData = 0x1;
  int nIter = 1000;

  hSrc = new d_uint16[nBytes];
  REQUIRE(hSrc != nullptr);
  hDst =  new uint;
  REQUIRE(hDst != nullptr);
  hDst[0] = 0;

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

  HIP_CHECK(hipMalloc(&dSrc, nBytes));
  HIP_CHECK(hipMalloc(&dDst, sizeof(uint)));

  HIP_CHECK(hipStreamCreate(&stream));

  HIP_CHECK(hipMemcpy(dSrc, hSrc, nBytes, hipMemcpyHostToDevice));
  HIP_CHECK(hipMemcpy(dDst, hDst, sizeof(uint), hipMemcpyHostToDevice));

  hipLaunchKernelGGL(read_kernel, dim3(blocks), dim3(threadsPerBlock),
                                  0, stream, dSrc, N, dDst);
  HIP_CHECK(hipGetLastError());
  HIP_CHECK(hipMemcpy(hDst, dDst, sizeof(uint), hipMemcpyDeviceToHost));
  HIP_CHECK(hipDeviceSynchronize());

  if (hDst[0] != (nBytes / sizeof(uint))) {
    INFO("hipPerfDevMemReadSpeed - Data validation failed for warm up run!" <<
         " expected " << nBytes / sizeof(uint) << " got " << hDst[0]);
    return false;
  }

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

  for (int i = 0; i < nIter; i++) {
    hipLaunchKernelGGL(read_kernel, dim3(blocks), dim3(threadsPerBlock),
                                    0, stream, dSrc, N, dDst);
    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();

  INFO("hipPerfDevMemReadSpeed - info: average read speed of " <<
        perf << " GB/s " << "achieved for memory size of " <<
        nBytes / (1024 * 1024) << " MB");

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

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

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

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