/* Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.

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. */

#if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP)
#include "paddle/phi/core/cuda_stream.h"
#endif

#include "glog/logging.h"

namespace phi {

#if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP)

CUDAStream::CUDAStream(const Place& place,
                       const int priority,
                       const StreamFlag& flag) {
  place_ = place;
  gpuStream_t stream = nullptr;
  backends::gpu::GPUDeviceGuard guard(place_.device);

  // Stream priorities follow a convention where lower numbers imply greater
  // priorities
  auto priority_range = backends::gpu::GetGpuStreamPriorityRange();
  int least_priority = priority_range.first;      // 0 in V100
  int greatest_priority = priority_range.second;  // -5 in V100

  // NOTE(Ruibiao): Replacing the following `PADDLE_ENFORCE_EQ` with
  // `PADDLE_ENFORCE` leads to a nvcc compile error. This is probably a bug.
  PADDLE_ENFORCE_EQ(
      priority <= least_priority && priority >= greatest_priority,
      true,
      common::errors::InvalidArgument(
          "Cannot create a stream with priority = %d because stream priority "
          "must be inside the meaningful range [%d, %d].",
          priority,
          least_priority,
          greatest_priority));

#ifdef PADDLE_WITH_HIP
  PADDLE_ENFORCE_GPU_SUCCESS(hipStreamCreateWithPriority(
      &stream, static_cast<unsigned int>(flag), priority));
#else
  PADDLE_ENFORCE_GPU_SUCCESS(cudaStreamCreateWithPriority(
      &stream, static_cast<unsigned int>(flag), priority));
#endif

  VLOG(10) << "Create CUDAStream " << stream << " with priority = " << priority
           << ", flag = " << static_cast<unsigned int>(flag);
  stream_ = Stream(reinterpret_cast<StreamId>(stream));
  owned_ = true;
}

CUDAStream::CUDAStream(const Place& place, gpuStream_t external_raw_stream) {
  place_ = place;
  backends::gpu::GPUDeviceGuard guard(place_.device);

  stream_ = Stream(reinterpret_cast<StreamId>(external_raw_stream));

  owned_ = false;

  VLOG(10) << "Create CUDAStream from external stream " << external_raw_stream
           << " on device " << place_.device;
}

bool CUDAStream::Query() const {
#ifdef PADDLE_WITH_HIP
  hipError_t err = hipStreamQuery(raw_stream());
  if (err == hipSuccess) {
    return true;
  }
  if (err == hipErrorNotReady) {
    return false;
  }
#else
  cudaError_t err = cudaStreamQuery(raw_stream());
  if (err == cudaSuccess) {
    return true;
  }
  if (err == cudaErrorNotReady) {
    return false;
  }
#endif

  PADDLE_ENFORCE_GPU_SUCCESS(err);
  return false;
}

void CUDAStream::Synchronize() const {
  VLOG(10) << "Synchronize " << raw_stream();
  backends::gpu::GpuStreamSync(raw_stream());
}

CUDAStream::~CUDAStream() {
  VLOG(10) << "~CUDAStream " << raw_stream();
  if (owned_ && stream_.id() != 0) {
    Synchronize();
    backends::gpu::GPUDeviceGuard guard(place_.device);
#ifdef PADDLE_WITH_HIP
    hipStreamDestroy(raw_stream());
#else
    cudaStreamDestroy(raw_stream());
#endif
  }
}

#endif

}  // namespace phi