/* Copyright (c) 2016 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. */

#pragma once

#ifdef PADDLE_WITH_CUDA

#include <cuda_runtime.h>
#include <stddef.h>
#include <string>
#include <vector>

namespace paddle {
namespace platform {

//! Get the total number of GPU devices in system.
int GetCUDADeviceCount();

//! Get the compute capability of the ith GPU (format: major * 10 + minor)
int GetCUDAComputeCapability(int i);

//! Get the runtime version of the ith GPU
int GetCUDARuntimeVersion(int id);

//! Get the driver version of the ith GPU
int GetCUDADriverVersion(int id);

//! Wheter the current device support TensorCore
bool TensorCoreAvailable();

//! Get the MultiProcessors of the ith GPU.
int GetCUDAMultiProcessors(int i);

//! Get the MaxThreads of each MultiProcessor of the ith GPU.
int GetCUDAMaxThreadsPerMultiProcessor(int i);

//! Get the current GPU device id in system.
int GetCurrentDeviceId();

//! Get the maximum GridDim size for GPU buddy allocator.
dim3 GetGpuMaxGridDimSize(int);

//! Get a list of device ids from environment variable or use all.
std::vector<int> GetSelectedDevices();

//! Set the GPU device id for next execution.
void SetDeviceId(int device_id);

//! Get the memory usage of current GPU device.
void GpuMemoryUsage(size_t *available, size_t *total);

//! Get the available memory to allocate, which is the size of available gpu
//! minus reserving.
size_t GpuAvailableMemToAlloc();

//! Get the maximum allocation size of current GPU device.
size_t GpuMaxAllocSize();

//! Get the initial allocation size of current GPU device.
size_t GpuInitAllocSize();

//! Get the re-allocation size of current GPU device.
size_t GpuReallocSize();

//! Get the minimum chunk size for GPU buddy allocator.
size_t GpuMinChunkSize();

//! Get the maximum chunk size for GPU buddy allocator.
size_t GpuMaxChunkSize();

//! Copy memory from address src to dst asynchronously.
void GpuMemcpyAsync(void *dst, const void *src, size_t count,
                    enum cudaMemcpyKind kind, cudaStream_t stream);

//! Copy memory from address src to dst synchronously.
void GpuMemcpySync(void *dst, const void *src, size_t count,
                   enum cudaMemcpyKind kind);

//! Copy memory from one device to another device asynchronously.
void GpuMemcpyPeerAsync(void *dst, int dst_device, const void *src,
                        int src_device, size_t count, cudaStream_t stream);

//! Copy memory from one device to another device synchronously.
void GpuMemcpyPeerSync(void *dst, int dst_device, const void *src,
                       int src_device, size_t count);

//! Set memory dst with value count size asynchronously
void GpuMemsetAsync(void *dst, int value, size_t count, cudaStream_t stream);

}  // namespace platform
}  // namespace paddle

#endif
