/*
Copyright (c) 2021 Advanced Micro Devices, Inc. All rights reserved.

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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,
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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THE SOFTWARE.
*/

/*
This testfile verifies the following scenarios of hipHostRegister API
1. Referencing the hipHostRegister variable from kernel and performing
   memset on that variable.This is verified for different datatypes.
2. hipHostRegister and perform hipMemcpy on it.
*/

#include <hip_test_common.hh>
#include <hip_test_checkers.hh>
#include <hip_test_kernels.hh>

#define OFFSET 128
static constexpr auto LEN{1024*1024};

template<typename T>
__global__ void Inc(T* Ad) {
    int tx = threadIdx.x + blockIdx.x * blockDim.x;
    Ad[tx] = Ad[tx] + static_cast<T>(1);
}

template <typename T>
void doMemCopy(size_t numElements, int offset, T* A, T* Bh, T* Bd,
               bool internalRegister) {
    constexpr auto memsetval = 13.0f;
    A = A + offset;
    numElements -= offset;

    size_t sizeBytes = numElements * sizeof(T);

    if (internalRegister) {
        HIP_CHECK(hipHostRegister(A, sizeBytes, 0));
    }

    // Reset
    for (size_t i = 0; i < numElements; i++) {
        A[i] = static_cast<float>(i);
        Bh[i] = 0.0f;
    }

    HIP_CHECK(hipMemset(Bd, memsetval, sizeBytes));

    HIP_CHECK(hipMemcpy(Bd, A, sizeBytes, hipMemcpyHostToDevice));
    HIP_CHECK(hipMemcpy(Bh, Bd, sizeBytes, hipMemcpyDeviceToHost));

    // Make sure the copy worked
    for (size_t i = 0; i < numElements; i++) {
       REQUIRE(Bh[i] == A[i]);
    }

    if (internalRegister) {
        HIP_CHECK(hipHostUnregister(A));
    }
}
/*
This testcase verifies the hipHostRegister API by
1. Allocating the memory using malloc
2. hipHostRegister that variable
3. Getting the corresponding device pointer of the registered varible
4. Launching kernel and access the device pointer variable
5. performing hipMemset on the device pointer variable
*/
TEMPLATE_TEST_CASE("Unit_hipHostRegister_ReferenceFromKernelandhipMemset",
                   "", int,
                   float, double) {
  size_t sizeBytes{LEN * sizeof(TestType)};
  TestType *A, **Ad;
  int num_devices;
  HIP_CHECK(hipGetDeviceCount(&num_devices));
  Ad = new TestType*[num_devices];
  A = reinterpret_cast<TestType*>(malloc(sizeBytes));
  HIP_CHECK(hipHostRegister(A, sizeBytes, 0));

  for (int i = 0; i < LEN; i++) {
    A[i] = static_cast<TestType>(1);
  }

  for (int i = 0; i < num_devices; i++) {
    HIP_CHECK(hipSetDevice(i));
    HIP_CHECK(hipHostGetDevicePointer(reinterpret_cast<void**>(&Ad[i]), A, 0));
  }

  // Reference the registered device pointer Ad from inside the kernel:
  for (int i = 0; i < num_devices; i++) {
    HIP_CHECK(hipSetDevice(i));
    hipLaunchKernelGGL(Inc, dim3(LEN / 512), dim3(512), 0, 0, Ad[i]);
    HIP_CHECK(hipDeviceSynchronize());
  }
  REQUIRE(A[10] == 1 + static_cast<TestType>(num_devices));
  // Reference the registered device pointer Ad in hipMemset:
  for (int i = 0; i < num_devices; i++) {
    HIP_CHECK(hipSetDevice(i));
    HIP_CHECK(hipMemset(Ad[i], 0, sizeBytes));
  }
  REQUIRE(A[10] == 0);

  HIP_CHECK(hipHostUnregister(A));

  free(A);
  delete [] Ad;
}
/*
This testcase verifies hipHostRegister API by
performing memcpy on the hipHostRegistered variable.
*/
TEMPLATE_TEST_CASE("Unit_hipHostRegister_Memcpy", "",
                   int, float, double) {
  // 1 refers to hipHostRegister
  // 0 refers to malloc
  auto mem_type = GENERATE(0, 1);
  HIP_CHECK(hipSetDevice(0));


  size_t sizeBytes = LEN * sizeof(TestType);
  TestType* A = reinterpret_cast<TestType*>(malloc(sizeBytes));

  // Copy to B, this should be optimal pinned malloc copy:
  // Note we are using the host pointer here:
  TestType *Bh, *Bd;
  Bh = reinterpret_cast<TestType*>(malloc(sizeBytes));
  HIP_CHECK(hipMalloc(&Bd, sizeBytes));

  REQUIRE(LEN > OFFSET);
  if (mem_type) {
    for (size_t i = 0; i < OFFSET; i++) {
      doMemCopy<TestType>(LEN, i, A, Bh, Bd, true /*internalRegister*/);
    }
  } else {
    HIP_CHECK(hipHostRegister(A, sizeBytes, 0));
    for (size_t i = 0; i < OFFSET; i++) {
      doMemCopy<TestType>(LEN, i, A, Bh, Bd, false /*internalRegister*/);
    }
    HIP_CHECK(hipHostUnregister(A));
  }

  free(A);
  free(Bh);
  hipFree(Bd);
}