MemFenceUniformCudaHipBuiltIn.hpp

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/* Copyright 2022 Jan Stephan, Andrea Bocci, Bernhard Manfred Gruber
 * SPDX-License-Identifier: MPL-2.0
 */
 
#pragma once
 
#include "alpaka/core/BoostPredef.hpp"
#include "alpaka/core/Concepts.hpp"
#include "alpaka/mem/fence/Traits.hpp"
 
#if defined(ALPAKA_ACC_GPU_CUDA_ENABLED) || defined(ALPAKA_ACC_GPU_HIP_ENABLED)
 
namespace alpaka
{
    //! The GPU CUDA/HIP memory fence.
    class MemFenceUniformCudaHipBuiltIn : public concepts::Implements<ConceptMemFence, MemFenceUniformCudaHipBuiltIn>
    {
    };
 
#    if !defined(ALPAKA_HOST_ONLY)
 
#        if defined(ALPAKA_ACC_GPU_CUDA_ENABLED) && !BOOST_LANG_CUDA
#            error If ALPAKA_ACC_GPU_CUDA_ENABLED is set, the compiler has to support CUDA!
#        endif
 
#        if defined(ALPAKA_ACC_GPU_HIP_ENABLED) && !BOOST_LANG_HIP
#            error If ALPAKA_ACC_GPU_HIP_ENABLED is set, the compiler has to support HIP!
#        endif
 
    namespace trait
    {
        template<>
        struct MemFence<MemFenceUniformCudaHipBuiltIn, memory_scope::Block>
        {
            __device__ static auto mem_fence(MemFenceUniformCudaHipBuiltIn const&, memory_scope::Block const&)
            {
                __threadfence_block();
            }
        };
 
        template<>
        struct MemFence<MemFenceUniformCudaHipBuiltIn, memory_scope::Grid>
        {
            __device__ static auto mem_fence(MemFenceUniformCudaHipBuiltIn const&, memory_scope::Grid const&)
            {
                // CUDA and HIP do not have a per-grid memory fence, so a device-level fence is used
                __threadfence();
            }
        };
 
        template<>
        struct MemFence<MemFenceUniformCudaHipBuiltIn, memory_scope::Device>
        {
            __device__ static auto mem_fence(MemFenceUniformCudaHipBuiltIn const&, memory_scope::Device const&)
            {
                __threadfence();
            }
        };
    } // namespace trait
 
#    endif
 
} // namespace alpaka
 
#endif