text: /**
   * Copyright 2019 Huawei Technologies Co., Ltd
   *
   * Licensed 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 MINDSPORE_CCSRC_DEVICE_GPU_CUDA_COMMON_H_
  #define MINDSPORE_CCSRC_DEVICE_GPU_CUDA_COMMON_H_
  
  #include <algorithm>
  #include "device/gpu/gpu_device_manager.h"
  
  namespace mindspore {
  namespace device {
  namespace gpu {
  class CudaCommon {
   public:
    inline int threads_num() const { return threads_per_block_; }
    inline int major_sm() const { return major_sm_; }
    inline int blocks_num(const int total_threads) const {
      return std::min(((total_threads - 1) / threads_per_block_) + 1, max_blocks_);
    }
  
    static CudaCommon &GetInstance() {
      static CudaCommon instance;
      return instance;
    }
  
   private:
    CudaCommon() {
      uint32_t device_id = GPUDeviceManager::GetInstance().cur_device_id();
      cudaDeviceProp prop;
      (void)cudaGetDeviceProperties(&prop, device_id);
      threads_per_block_ = prop.maxThreadsPerBlock;
      max_blocks_ = prop.multiProcessorCount;
      major_sm_ = prop.major;
    }
    ~CudaCommon() = default;
    CudaCommon(const CudaCommon &) = delete;
    CudaCommon &operator=(const CudaCommon &) = delete;
  
    int max_blocks_;
    int threads_per_block_;
    int major_sm_;
  };
  #define GET_BLOCKS(total_threads) mindspore::device::gpu::CudaCommon::GetInstance().blocks_num(total_threads)
  #define GET_THREADS mindspore::device::gpu::CudaCommon::GetInstance().threads_num()
  #define GET_MAJOR_SM mindspore::device::gpu::CudaCommon::GetInstance().major_sm()
  #define MINIUM_SM 6
  #define RECOMMEND_SM 7
  }  // namespace gpu
  }  // namespace device
  }  // namespace mindspore
  
  #endif  // MINDSPORE_CCSRC_DEVICE_GPU_CUDA_COMMON_H_
  