gpu_resources.hpp

/*
  Copyright 2025 Equinor ASA
  This file is part of the Open Porous Media project (OPM).
  OPM is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  OPM is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  You should have received a copy of the GNU General Public License
  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef OPM_SIMULATORS_LINALG_GPUISTL_GPU_RESOURCES_HPP
#define OPM_SIMULATORS_LINALG_GPUISTL_GPU_RESOURCES_HPP
#include <cuda.h>
#include <cuda_runtime.h>
#include <opm/simulators/linalg/gpuistl/detail/gpu_safe_call.hpp>
#include <type_traits>

#define OPM_CREATE_GPU_RESOURCE(name, type, create, destroy, ...)                                                      \
    class name                                                                                                         \
    {                                                                                                                  \
    public:                                                                                                            \
        using resource_type = type;                                                                                    \
                                                                                                                       \
        name()                                                                                                         \
        {                                                                                                              \
            OPM_GPU_SAFE_CALL(create(&resource_, ##__VA_ARGS__));                                                      \
        }                                                                                                              \
        name(const name&) = delete;                                                                                    \
        name& operator=(const name&) = delete;                                                                         \
                                                                                                                       \
        ~name()                                                                                                        \
        {                                                                                                              \
            OPM_GPU_WARN_IF_ERROR(destroy(resource_));                                                                 \
        }                                                                                                              \
                                                                                                                       \
        const resource_type& get() const                                                                               \
        {                                                                                                              \
            return resource_;                                                                                          \
        }                                                                                                              \
        resource_type& get()                                                                                           \
        {                                                                                                              \
            return resource_;                                                                                          \
        }                                                                                                              \
                                                                                                                       \
    private:                                                                                                           \
        resource_type resource_ = nullptr;                                                                             \
    }

#define OPM_CREATE_GPU_RESOURCE_NO_CREATE(name, type, destroy)                                                         \
    class name                                                                                                         \
    {                                                                                                                  \
    public:                                                                                                            \
        using resource_type = type;                                                                                    \
                                                                                                                       \
        name() = default;                                                                                              \
                                                                                                                       \
        ~name()                                                                                                        \
        {                                                                                                              \
            OPM_GPU_WARN_IF_ERROR(destroy(resource_));                                                                 \
        }                                                                                                              \
        name(const name&) = delete;                                                                                    \
        name& operator=(const name&) = delete;                                                                         \
                                                                                                                       \
        const resource_type& get() const                                                                               \
        {                                                                                                              \
            return resource_;                                                                                          \
        }                                                                                                              \
        resource_type& get()                                                                                           \
        {                                                                                                              \
            return resource_;                                                                                          \
        }                                                                                                              \
                                                                                                                       \
    private:                                                                                                           \
        resource_type resource_;                                                                                       \
    }

namespace Opm::gpuistl
{
OPM_CREATE_GPU_RESOURCE(GPUStream, cudaStream_t, cudaStreamCreate, cudaStreamDestroy);

OPM_CREATE_GPU_RESOURCE(GPUEvent, cudaEvent_t, cudaEventCreate, cudaEventDestroy);

OPM_CREATE_GPU_RESOURCE(
    GPUGraph, cudaGraph_t, cudaGraphCreate, cudaGraphDestroy, 0); // Per documentation, needs 0 as last argument

OPM_CREATE_GPU_RESOURCE_NO_CREATE(GPUGraphExec, cudaGraphExec_t, cudaGraphExecDestroy);
} // namespace Opm::gpuistl
#endif