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*/

/*
Following scenarios are verified for hipPointerGetAttributes API
1. Run through a couple simple cases to test lookups host pointer arithmetic
2. Allocates memory across all devices withing the specified size range
3. Allocates tiny memory across all devices
4. Multi-threaded test with many simul allocs.

*/
#include<hip_test_common.hh>
#include <vector>
#include <iostream>
#include <string>

size_t Nbytes = 0;
constexpr size_t N{1000000};



//=================================================================================================
// Utility Functions:
//=================================================================================================

bool operator==(const hipPointerAttribute_t& lhs,
                const hipPointerAttribute_t& rhs) {
  return ((lhs.hostPointer == rhs.hostPointer) &&
          (lhs.devicePointer == rhs.devicePointer) &&
         (lhs.memoryType == rhs.memoryType) && (lhs.device == rhs.device) &&
         (lhs.allocationFlags == rhs.allocationFlags));
}


bool operator!=(const hipPointerAttribute_t& lhs,
                const hipPointerAttribute_t& rhs) {
  return !(lhs == rhs);
}


const char* memoryTypeToString(hipMemoryType memoryType) {
  switch (memoryType) {
    case hipMemoryTypeHost:
      return "[Host]";
    case hipMemoryTypeDevice:
      return "[Device]";
    default:
      return "[Unknown]";
  }
}


void resetAttribs(hipPointerAttribute_t* attribs) {
    attribs->hostPointer = reinterpret_cast<void*>(-1);
    attribs->devicePointer = reinterpret_cast<void*>(-1);
    attribs->memoryType = hipMemoryTypeHost;
    attribs->device = -2;
    attribs->isManaged = -1;
    attribs->allocationFlags = 0xffff;
}


void printAttribs(const hipPointerAttribute_t* attribs) {
  printf(
        "hostPointer:%p devicePointer:%p  memType:%s deviceId:%d isManaged:%d "
        "allocationFlags:%u\n",
        attribs->hostPointer, attribs->devicePointer,
        memoryTypeToString(attribs->memoryType),
        attribs->device, attribs->isManaged, attribs->allocationFlags);
}


inline int zrand(int max) { return rand() % max; }



// Store the hipPointer attrib and some extra info
// so can later compare the looked-up info against
// the reference expectation
struct SuperPointerAttribute {
    void* _pointer;
    size_t _sizeBytes;
    hipPointerAttribute_t _attrib;
};


// Support function to check result against a reference:
void checkPointer(const SuperPointerAttribute& ref, int major,
                  int minor, void* pointer) {
    hipPointerAttribute_t attribs;
    resetAttribs(&attribs);

    hipError_t e = hipPointerGetAttributes(&attribs, pointer);
    if ((e != hipSuccess) || (attribs != ref._attrib)) {
        HIP_CHECK(e);
        REQUIRE(attribs != ref._attrib);
    } else {
        printf("#%4d.%d GOOD:%p getattr ::  ", major, minor, pointer);
        printAttribs(&attribs);
    }
}


// Test that allocates memory across all devices withing the
// specified size range
// (minSize...maxSize). Then does lookups to make sure the
// info reported by the tracker matches
// expecations Then deallocates it all.
// Multiple threads can call this function and in fact
// we do this in the testMultiThreaded_1 test.
void clusterAllocs(int numAllocs, size_t minSize, size_t maxSize) {
  Nbytes = N * sizeof(char);
  printf("clusterAllocs numAllocs=%d size=%lu..%lu\n",
         numAllocs, minSize, maxSize);
  const int Max_Devices = 256;
  std::vector<SuperPointerAttribute> reference(numAllocs);

  REQUIRE(minSize > 0);
  REQUIRE(maxSize >= minSize);

  int numDevices;
  HIP_CHECK(hipGetDeviceCount(&numDevices));

  //---
  // Populate with device and host allocations.
  size_t totalDeviceAllocated[Max_Devices];
  for (int i = 0; i < numDevices; i++) {
    totalDeviceAllocated[i] = 0;
  }
  for (int i = 0; i < numAllocs; i++) {
    unsigned rand_seed = time(NULL);
    bool isDevice = HipTest::RAND_R(&rand_seed) & 0x1;
    reference[i]._sizeBytes = zrand(maxSize - minSize) + minSize;

    reference[i]._attrib.device = zrand(numDevices);
    HIP_CHECK(hipSetDevice(reference[i]._attrib.device));
    reference[i]._attrib.isManaged = 0;

    void* ptr;
    if (isDevice) {
      totalDeviceAllocated[reference[i]._attrib.device] +=
                           reference[i]._sizeBytes;
      HIP_CHECK(hipMalloc(reinterpret_cast<void**>(&ptr),
                         reference[i]._sizeBytes));
      reference[i]._attrib.memoryType = hipMemoryTypeDevice;
      reference[i]._attrib.devicePointer = ptr;
      reference[i]._attrib.hostPointer = NULL;
      reference[i]._attrib.allocationFlags = 0;
    } else {
      HIP_CHECK(hipHostMalloc(reinterpret_cast<void**>(&ptr),
                             reference[i]._sizeBytes,
                             hipHostMallocDefault));
      reference[i]._attrib.memoryType = hipMemoryTypeHost;
      reference[i]._attrib.devicePointer = ptr;
      reference[i]._attrib.hostPointer = ptr;
      reference[i]._attrib.allocationFlags = 0;
    }
    reference[i]._pointer = ptr;
  }

  for (int i = 0; i < numDevices; i++) {
    size_t free, total;
    HIP_CHECK(hipSetDevice(i));
    HIP_CHECK(hipMemGetInfo(&free, &total));
    printf(
           "  device#%d: hipMemGetInfo: "
           "free=%zu (%4.2fMB) totalDevice=%lu (%4.2fMB) total=%zu "
           "(%4.2fMB)\n",
           i, free, (free / 1024.0 / 1024.0), totalDeviceAllocated[i],
           (totalDeviceAllocated[i]) / 1024.0 / 1024.0, total,
           (total / 1024.0 / 1024.0));
    REQUIRE(free + totalDeviceAllocated[i] <= total);
  }

  // Now look up each pointer we inserted and verify we can find it:
  char * ptr;
  for (int i = 0; i < numAllocs; i++) {
    SuperPointerAttribute& ref = reference[i];
    ptr = static_cast<char *>(ref._pointer);
    checkPointer(ref, i, 0, ref._pointer);
    checkPointer(ref, i, 1, (ptr +
                 ref._sizeBytes / 2));
    if (ref._sizeBytes > 1) {
      checkPointer(ref, i, 2, (ptr +
                   ref._sizeBytes - 1));
    }

    if (ref._attrib.memoryType == hipMemoryTypeDevice) {
      hipFree(ref._pointer);
    } else {
      hipHostFree(ref._pointer);
    }
  }
}

//========================================================================
// Functions to run tests
//=======================================================================
//--
// Run through a couple simple cases to test lookups host pointer arithmetic:
TEST_CASE("Unit_hipPointerGetAttributes_Basic") {
  HIP_CHECK(hipSetDevice(0));
  Nbytes = N * sizeof(char);
  printf("\n");
  printf("=============================================================\n");
  printf("Simple Tests\n");
  printf("=============================================================\n");

  char* A_d;
  char* A_Pinned_h;
  char* A_OSAlloc_h;
  hipError_t e;

  HIP_CHECK(hipMalloc(&A_d, Nbytes));
  HIP_CHECK(hipHostMalloc(reinterpret_cast<void**>(&A_Pinned_h), Nbytes,
                         hipHostMallocDefault));
  A_OSAlloc_h = reinterpret_cast<char*>(malloc(Nbytes));

  size_t free, total;
  HIP_CHECK(hipMemGetInfo(&free, &total));
  printf("hipMemGetInfo: free=%zu (%4.2f) Nbytes=%lu total=%zu (%4.2f)\n", free,
         (free / 1024.0 / 1024.0), Nbytes, total,
         (total / 1024.0 / 1024.0));
  REQUIRE(free + Nbytes <= total);


  hipPointerAttribute_t attribs;
  hipPointerAttribute_t attribs2;

  // Device memory
  printf("\nDevice memory (hipMalloc)\n");
  HIP_CHECK(hipPointerGetAttributes(&attribs, A_d));

  // Check pointer arithmetic cases:
  resetAttribs(&attribs2);
  HIP_CHECK(hipPointerGetAttributes(&attribs2, A_d + 100));
  char *ptr = reinterpret_cast<char *>(attribs.devicePointer);
  REQUIRE(ptr + 100 ==
            reinterpret_cast<char*>(attribs2.devicePointer));

  // Corner case at end of array:
  resetAttribs(&attribs2);
  HIP_CHECK(hipPointerGetAttributes(&attribs2, A_d + Nbytes - 1));
  REQUIRE((ptr + Nbytes - 1) ==
            reinterpret_cast<char*>(attribs2.devicePointer));

  // Pointer just beyond array must be invalid or at least a different pointer
  resetAttribs(&attribs2);
  e = hipPointerGetAttributes(&attribs2, A_d + Nbytes + 1);
  if (e != hipErrorInvalidValue) {
    // We might have strayed into another pointer area.
    REQUIRE(reinterpret_cast<char*>(ptr) !=
              reinterpret_cast<char*>(attribs2.devicePointer));
  }


  resetAttribs(&attribs2);
  e = hipPointerGetAttributes(&attribs2, A_d + Nbytes);
  if (e != hipErrorInvalidValue) {
    REQUIRE(attribs.devicePointer != attribs2.devicePointer);
  }
  hipFree(A_d);
  e = hipPointerGetAttributes(&attribs, A_d);
  REQUIRE(e == hipErrorInvalidValue);

  // Device-visible host memory
  printf("\nDevice-visible host memory (hipHostMalloc)\n");
  HIP_CHECK(hipPointerGetAttributes(&attribs, A_Pinned_h));

  resetAttribs(&attribs2);
  HIP_CHECK(hipPointerGetAttributes(&attribs2, A_Pinned_h + Nbytes / 2));
  char *ptr1 = reinterpret_cast<char *>(attribs.hostPointer);
  REQUIRE((ptr1 + Nbytes / 2)
            == reinterpret_cast<char*>(attribs2.hostPointer));


  hipHostFree(A_Pinned_h);
  e = hipPointerGetAttributes(&attribs, A_Pinned_h);
  REQUIRE(e == hipErrorInvalidValue);

  // OS memory
  printf("\nOS-allocated memory (malloc)\n");
  e = hipPointerGetAttributes(&attribs, A_OSAlloc_h);
  REQUIRE(e == hipErrorInvalidValue);
}

TEST_CASE("Unit_hipPointerGetAttributes_ClusterAlloc") {
  srand(0x100);
  printf("\n=============================================\n");
  clusterAllocs(100, 1024 * 1, 1024 * 1024);
}

TEST_CASE("Unit_hipPointerGetAttributes_TinyClusterAlloc") {
  srand(0x200);
  printf("\n=============================================\n");
  clusterAllocs(1000, 1, 10);  //  Many tiny allocations;
}

// Multi-threaded test with many simul allocs.
// IN : serialize will force the test to run in serial fashion.
TEST_CASE("Unit_hipPointerGetAttributes_MultiThread") {
    srand(0x300);
    auto serialize = 1;
    printf("\n=============================================\n");
    printf("MultiThreaded_1\n");
    if (serialize) printf("[SERIALIZE]\n");
    printf("===============================================\n");
    std::thread t1(clusterAllocs, 1000, 101, 1000);
    if (serialize) t1.join();

    std::thread t2(clusterAllocs, 1000, 11, 100);
    if (serialize) t2.join();

    std::thread t3(clusterAllocs, 1000, 5, 10);
    if (serialize) t3.join();

    std::thread t4(clusterAllocs, 1000, 1, 4);
    if (serialize) t4.join();
}