Method IpcCreate

rocclr/device/device.cpp:1028–1063

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// ================================================================================================
bool Device::IpcCreate(void* dev_ptr, size_t* mem_size, char* handle, size_t* mem_offset) const {
  amd::Memory* amd_mem_obj = amd::MemObjMap::FindMemObj(dev_ptr);
  if (amd_mem_obj == nullptr) {
    DevLogPrintfError("Cannot retrieve amd_mem_obj for dev_ptr: 0x%x", dev_ptr);
    return false;
  }

  // Get the original pointer from the amd::Memory object
  void* orig_dev_ptr = nullptr;
  if (amd_mem_obj->getSvmPtr() != nullptr) {
    orig_dev_ptr = amd_mem_obj->getSvmPtr();
  } else if (amd_mem_obj->getHostMem() != nullptr) {
    orig_dev_ptr = amd_mem_obj->getHostMem();
  } else {
    ShouldNotReachHere();
  }

  // Check if the dev_ptr is lesser than original dev_ptr
  if (orig_dev_ptr > dev_ptr) {
    // If this happens, then revisit FindMemObj logic
    DevLogPrintfError("Original dev_ptr: 0x%x cannot be greater than dev_ptr: 0x%x", orig_dev_ptr,
                      dev_ptr);
    return false;
  }

  // Calculate the memory offset from the original base ptr
  *mem_offset = reinterpret_cast<address>(dev_ptr) - reinterpret_cast<address>(orig_dev_ptr) +
                amd_mem_obj->getOffset();

  *mem_size = amd_mem_obj->getSize();

  auto dev_mem = static_cast<device::Memory*>(amd_mem_obj->getDeviceMemory(*this));
  auto result = dev_mem->ExportHandle(handle);

  return result;
}

// ================================================================================================
bool Device::IpcAttach(const char* handle, size_t mem_size, size_t mem_offset, unsigned int flags,