device_api.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
 
#ifndef TVM_RUNTIME_DEVICE_API_H_
#define TVM_RUNTIME_DEVICE_API_H_
 
#include <tvm/runtime/c_runtime_api.h>
#include <tvm/runtime/ndarray.h>
#include <tvm/runtime/packed_func.h>
 
#include <string>
 
namespace tvm {
namespace runtime {
enum DeviceAttrKind : int {
  kExist = 0,
  kMaxThreadsPerBlock = 1,
  kWarpSize = 2,
  kMaxSharedMemoryPerBlock = 3,
  kComputeVersion = 4,
  kDeviceName = 5,
  kMaxClockRate = 6,
  kMultiProcessorCount = 7,
  kMaxThreadDimensions = 8,
  kMaxRegistersPerBlock = 9,
  kGcnArch = 10,
  kApiVersion = 11,
  kDriverVersion = 12,
  kL2CacheSizeBytes = 13,
  kTotalGlobalMemory = 14,
  kAvailableGlobalMemory = 15,
};
 
#ifdef TVM_KALLOC_ALIGNMENT
constexpr int kAllocAlignment = TVM_KALLOC_ALIGNMENT;
 
constexpr int kTempAllocaAlignment = TVM_KALLOC_ALIGNMENT;
#else
constexpr int kAllocAlignment = 64;
 
constexpr int kTempAllocaAlignment = 64;
#endif  // TVM_KALLOC_ALIGNMENT
 
constexpr int kMaxStackAlloca = 1024;
 
constexpr int kDefaultWorkspaceAlignment = 1;
 
class TVM_DLL DeviceAPI {
 public:
  virtual ~DeviceAPI() {}
  virtual void SetDevice(Device dev) = 0;
  virtual void GetAttr(Device dev, DeviceAttrKind kind, TVMRetValue* rv) = 0;
 
  virtual size_t GetDataSize(const DLTensor& arr, Optional<String> mem_scope = NullOpt);
 
  virtual void GetTargetProperty(Device dev, const std::string& property, TVMRetValue* rv) {}
 
  virtual void* AllocDataSpace(Device dev, size_t nbytes, size_t alignment,
                               DLDataType type_hint) = 0;
  virtual void* AllocDataSpace(Device dev, int ndim, const int64_t* shape, DLDataType dtype,
                               Optional<String> mem_scope = NullOpt);
  virtual void FreeDataSpace(Device dev, void* ptr) = 0;
  virtual void CopyDataFromTo(DLTensor* from, DLTensor* to, TVMStreamHandle stream);
  virtual TVMStreamHandle CreateStream(Device dev);
 
  virtual void FreeStream(Device dev, TVMStreamHandle stream);
 
  virtual void StreamSync(Device dev, TVMStreamHandle stream) = 0;
  virtual void SetStream(Device dev, TVMStreamHandle stream) {}
  virtual TVMStreamHandle GetCurrentStream(Device dev);
  virtual void SyncStreamFromTo(Device dev, TVMStreamHandle event_src, TVMStreamHandle event_dst);
  virtual void* AllocWorkspace(Device dev, size_t nbytes, DLDataType type_hint = {});
  virtual void FreeWorkspace(Device dev, void* ptr);
 
  static DeviceAPI* Get(Device dev, bool allow_missing = false);
 
  static bool NeedSetDevice(int device_type) {
    return device_type != kDLCPU && device_type != kDLMicroDev;
  }
 
  virtual bool SupportsDevicePointerArithmeticsOnHost() { return false; }
 
 protected:
  virtual void CopyDataFromTo(const void* from, size_t from_offset, void* to, size_t to_offset,
                              size_t num_bytes, Device dev_from, Device dev_to,
                              DLDataType type_hint, TVMStreamHandle stream);
};
 
constexpr int kRPCSessMask = 128;
static_assert(kRPCSessMask >= TVMDeviceExtType_End);
 
inline bool IsRPCSessionDevice(Device dev) { return (dev.device_type / kRPCSessMask) > 0; }
 
inline int GetRPCSessionIndex(Device dev) {
  ICHECK(IsRPCSessionDevice(dev)) << "GetRPCSessionIndex: dev has no RPC session";
  return dev.device_type / kRPCSessMask - 1;
}
 
inline Device RemoveRPCSessionMask(Device dev) {
  dev.device_type = static_cast<DLDeviceType>(dev.device_type % kRPCSessMask);
  return dev;
}
 
inline std::ostream& operator<<(std::ostream& os, DLDevice dev) {  // NOLINT(*)
  if (tvm::runtime::IsRPCSessionDevice(dev)) {
    os << "remote[" << tvm::runtime::GetRPCSessionIndex(dev) << "]-";
    dev = tvm::runtime::RemoveRPCSessionMask(dev);
  }
  os << tvm::runtime::DLDeviceType2Str(static_cast<int>(dev.device_type)) << ":" << dev.device_id;
  return os;
}
 
inline Device AddRPCSessionMask(Device dev, int session_table_index) {
  CHECK(!IsRPCSessionDevice(dev)) << "AddRPCSessionMask: dev already non-zero RPCSessionIndex: "
                                  << dev;
  dev.device_type =
      static_cast<DLDeviceType>(dev.device_type | (kRPCSessMask * (session_table_index + 1)));
  return dev;
}
 
}  // namespace runtime
}  // namespace tvm
 
#endif  // TVM_RUNTIME_DEVICE_API_H_