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Kokkos_OpenMPTargetSpace.hpp
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Kokkos_OpenMPTargetSpace.hpp
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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//@HEADER
#ifndef KOKKOS_IMPL_PUBLIC_INCLUDE
#include <Kokkos_Macros.hpp>
static_assert(false,
"Including non-public Kokkos header files is not allowed.");
#endif
#ifndef KOKKOS_OPENMPTARGETSPACE_HPP
#define KOKKOS_OPENMPTARGETSPACE_HPP
#include <cstring>
#include <string>
#include <iosfwd>
#include <typeinfo>
#include <Kokkos_Core_fwd.hpp>
#ifdef KOKKOS_ENABLE_OPENMPTARGET
#include <OpenMPTarget/Kokkos_OpenMPTarget_Error.hpp>
#include <Kokkos_HostSpace.hpp>
#include <omp.h>
namespace Kokkos {
namespace Impl {
//----------------------------------------
template <>
struct MemorySpaceAccess<Kokkos::HostSpace,
Kokkos::Experimental::OpenMPTargetSpace> {
enum : bool { assignable = false };
enum : bool { accessible = false };
enum : bool { deepcopy = true };
};
//----------------------------------------
template <>
struct MemorySpaceAccess<Kokkos::Experimental::OpenMPTargetSpace,
Kokkos::HostSpace> {
enum : bool { assignable = false };
enum : bool { accessible = false };
enum : bool { deepcopy = true };
};
//----------------------------------------
} // namespace Impl
} // namespace Kokkos
namespace Kokkos {
namespace Experimental {
/// \class OpenMPTargetSpace
/// \brief Memory management for host memory.
///
/// OpenMPTargetSpace is a memory space that governs host memory. "Host"
/// memory means the usual CPU-accessible memory.
class OpenMPTargetSpace {
public:
//! Tag this class as a kokkos memory space
using memory_space = OpenMPTargetSpace;
using size_type = unsigned;
/// \typedef execution_space
/// \brief Default execution space for this memory space.
///
/// Every memory space has a default execution space. This is
/// useful for things like initializing a View (which happens in
/// parallel using the View's default execution space).
using execution_space = Kokkos::Experimental::OpenMPTarget;
//! This memory space preferred device_type
using device_type = Kokkos::Device<execution_space, memory_space>;
/*--------------------------------*/
/**\brief Default memory space instance */
OpenMPTargetSpace();
OpenMPTargetSpace(OpenMPTargetSpace&& rhs) = default;
OpenMPTargetSpace(const OpenMPTargetSpace& rhs) = default;
OpenMPTargetSpace& operator=(OpenMPTargetSpace&&) = default;
OpenMPTargetSpace& operator=(const OpenMPTargetSpace&) = default;
~OpenMPTargetSpace() = default;
/**\brief Allocate untracked memory in the space */
// FIXME_OPENMPTARGET Use execution space instance
void* allocate(const OpenMPTarget&, const size_t arg_alloc_size) const {
return allocate(arg_alloc_size);
}
// FIXME_OPENMPTARGET Use execution space instance
void* allocate(const OpenMPTarget&, const char* arg_label,
const size_t arg_alloc_size,
const size_t arg_logical_size = 0) const {
return allocate(arg_label, arg_alloc_size, arg_logical_size);
}
void* allocate(const size_t arg_alloc_size) const;
void* allocate(const char* arg_label, const size_t arg_alloc_size,
const size_t arg_logical_size = 0) const;
/**\brief Deallocate untracked memory in the space */
void deallocate(void* const arg_alloc_ptr,
const std::size_t arg_alloc_size) const;
void deallocate(const char* arg_label, void* const arg_alloc_ptr,
const size_t arg_alloc_size,
const size_t arg_logical_size = 0) const;
static constexpr const char* name() { return "OpenMPTargetSpace"; }
private:
void* impl_allocate(const char* arg_label, const size_t arg_alloc_size,
const size_t arg_logical_size = 0,
const Kokkos::Tools::SpaceHandle =
Kokkos::Tools::make_space_handle(name())) const;
void impl_deallocate(const char* arg_label, void* const arg_alloc_ptr,
const size_t arg_alloc_size,
const size_t arg_logical_size = 0,
const Kokkos::Tools::SpaceHandle =
Kokkos::Tools::make_space_handle(name())) const;
};
} // namespace Experimental
} // namespace Kokkos
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
KOKKOS_IMPL_HOST_INACCESSIBLE_SHARED_ALLOCATION_SPECIALIZATION(
Kokkos::Experimental::OpenMPTargetSpace);
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
namespace Kokkos {
namespace Impl {
// TODO: implement all possible deep_copies
template <class ExecutionSpace>
struct DeepCopy<Kokkos::Experimental::OpenMPTargetSpace,
Kokkos::Experimental::OpenMPTargetSpace, ExecutionSpace> {
DeepCopy(void* dst, const void* src, size_t n) {
// In the Release and RelWithDebInfo builds, the size of the memcpy should
// be greater than zero to avoid error. omp_target_memcpy returns zero on
// success.
if (n > 0)
KOKKOS_IMPL_OMPT_SAFE_CALL(omp_target_memcpy(
dst, const_cast<void*>(src), n, 0, 0, omp_get_default_device(),
omp_get_default_device()));
}
DeepCopy(const ExecutionSpace& exec, void* dst, const void* src, size_t n) {
exec.fence(
"Kokkos::Impl::DeepCopy<OpenMPTargetSpace, OpenMPTargetSpace>: fence "
"before "
"copy");
if (n > 0)
KOKKOS_IMPL_OMPT_SAFE_CALL(omp_target_memcpy(
dst, const_cast<void*>(src), n, 0, 0, omp_get_default_device(),
omp_get_default_device()));
}
};
template <class ExecutionSpace>
struct DeepCopy<Kokkos::Experimental::OpenMPTargetSpace, HostSpace,
ExecutionSpace> {
DeepCopy(void* dst, const void* src, size_t n) {
if (n > 0)
KOKKOS_IMPL_OMPT_SAFE_CALL(omp_target_memcpy(
dst, const_cast<void*>(src), n, 0, 0, omp_get_default_device(),
omp_get_initial_device()));
}
DeepCopy(const ExecutionSpace& exec, void* dst, const void* src, size_t n) {
exec.fence(
"Kokkos::Impl::DeepCopy<OpenMPTargetSpace, HostSpace>: fence before "
"copy");
if (n > 0)
KOKKOS_IMPL_OMPT_SAFE_CALL(omp_target_memcpy(
dst, const_cast<void*>(src), n, 0, 0, omp_get_default_device(),
omp_get_initial_device()));
}
};
template <class ExecutionSpace>
struct DeepCopy<HostSpace, Kokkos::Experimental::OpenMPTargetSpace,
ExecutionSpace> {
DeepCopy(void* dst, const void* src, size_t n) {
if (n > 0)
KOKKOS_IMPL_OMPT_SAFE_CALL(omp_target_memcpy(
dst, const_cast<void*>(src), n, 0, 0, omp_get_initial_device(),
omp_get_default_device()));
}
DeepCopy(const ExecutionSpace& exec, void* dst, const void* src, size_t n) {
exec.fence(
"Kokkos::Impl::DeepCopy<HostSpace, OpenMPTargetSpace>: fence before "
"copy");
if (n > 0)
KOKKOS_IMPL_OMPT_SAFE_CALL(omp_target_memcpy(
dst, const_cast<void*>(src), n, 0, 0, omp_get_initial_device(),
omp_get_default_device()));
}
};
} // namespace Impl
} // namespace Kokkos
#endif
#endif /* #define KOKKOS_OPENMPTARGETSPACE_HPP */