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Diffstat (limited to 'unsupported/Eigen/CXX11/src/Tensor/TensorDeviceSycl.h')
-rw-r--r-- | unsupported/Eigen/CXX11/src/Tensor/TensorDeviceSycl.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorDeviceSycl.h b/unsupported/Eigen/CXX11/src/Tensor/TensorDeviceSycl.h new file mode 100644 index 000000000..bfd36f5aa --- /dev/null +++ b/unsupported/Eigen/CXX11/src/Tensor/TensorDeviceSycl.h @@ -0,0 +1,122 @@ +// This file is part of Eigen, a lightweight C++ template library +// for linear algebra. +// +// Copyright (C) 2016 Benoit Steiner <benoit.steiner.goog@gmail.com> +// Mehdi Goli Codeplay Software Ltd. +// Ralph Potter Codeplay Software Ltd. +// Luke Iwanski Codeplay Software Ltd. +// Cummins Chris PhD student at The University of Edinburgh. +// Contact: <eigen@codeplay.com> + +// +// This Source Code Form is subject to the terms of the Mozilla +// Public License v. 2.0. If a copy of the MPL was not distributed +// with this file, You can obtain one at http://mozilla.org/MPL/2.0/. + +#if defined(EIGEN_USE_SYCL) && !defined(EIGEN_CXX11_TENSOR_TENSOR_DEVICE_SYCL_H) +#define EIGEN_CXX11_TENSOR_TENSOR_DEVICE_SYCL_H + +namespace Eigen { +/// \struct BufferT is used to specialise add_sycl_buffer function for +// two types of buffer we have. When the MapAllocator is true, we create the +// sycl buffer with MapAllocator. +/// We have to const_cast the input pointer in order to work around the fact +/// that sycl does not accept map allocator for const pointer. +template <typename T, bool MapAllocator> +struct BufferT { + using Type = cl::sycl::buffer<T, 1, cl::sycl::map_allocator<T>>; + static inline void add_sycl_buffer( + const T *ptr, size_t num_bytes, + std::map<const void *, std::shared_ptr<void>> &buffer_map) { + buffer_map.insert(std::pair<const void *, std::shared_ptr<void>>( + ptr, std::shared_ptr<void>(std::make_shared<Type>( + Type(const_cast<T *>(ptr), cl::sycl::range<1>(num_bytes)))))); + } +}; + +/// specialisation of the \ref BufferT when the MapAllocator is false. In this +/// case we only create the device-only buffer. +template <typename T> +struct BufferT<T, false> { + using Type = cl::sycl::buffer<T, 1>; + static inline void add_sycl_buffer( + const T *ptr, size_t num_bytes, + std::map<const void *, std::shared_ptr<void>> &buffer_map) { + buffer_map.insert(std::pair<const void *, std::shared_ptr<void>>( + ptr, std::shared_ptr<void>( + std::make_shared<Type>(Type(cl::sycl::range<1>(num_bytes)))))); + } +}; + +struct SyclDevice { + /// class members + /// sycl queue + cl::sycl::queue &m_queue; + /// std::map is the container used to make sure that we create only one buffer + /// per pointer. The lifespan of the buffer + /// now depends on the lifespan of SyclDevice. If a non-read-only pointer is + /// needed to be accessed on the host we should manually deallocate it. + mutable std::map<const void *, std::shared_ptr<void>> buffer_map; + + SyclDevice(cl::sycl::queue &q) : m_queue(q) {} + // destructor + ~SyclDevice() { deallocate_all(); } + + template <typename T> + void deallocate(const T *p) const { + auto it = buffer_map.find(p); + if (it != buffer_map.end()) { + buffer_map.erase(it); + } + } + void deallocate_all() const { buffer_map.clear(); } + + /// creation of sycl accessor for a buffer. This function first tries to find + /// the buffer in the buffer_map. + /// If found it gets the accessor from it, if not, the function then adds an + /// entry by creating a sycl buffer + /// for that particular pointer. + template <cl::sycl::access::mode AcMd, bool MapAllocator, typename T> + inline cl::sycl::accessor<T, 1, AcMd, cl::sycl::access::target::global_buffer> + get_sycl_accessor(size_t num_bytes, cl::sycl::handler &cgh, + const T *ptr) const { + auto it = buffer_map.find(ptr); + if (it == buffer_map.end()) { + BufferT<T, MapAllocator>::add_sycl_buffer(ptr, num_bytes, buffer_map); + } + return ( + ((typename BufferT<T, MapAllocator>::Type *)(buffer_map.at(ptr).get())) + ->template get_access<AcMd>(cgh)); + } + + /// allocating memory on the cpu + EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void *allocate(size_t num_bytes) const { + return internal::aligned_malloc(num_bytes); + } + + // some runtime conditions that can be applied here + bool isDeviceSuitable() const { return true; } + + EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void deallocate(void *buffer) const { + internal::aligned_free(buffer); + } + EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void memcpy(void *dst, const void *src, + size_t n) const { + ::memcpy(dst, src, n); + } + EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void memcpyHostToDevice( + void *dst, const void *src, size_t n) const { + memcpy(dst, src, n); + } + EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void memcpyDeviceToHost( + void *dst, const void *src, size_t n) const { + memcpy(dst, src, n); + } + EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void memset(void *buffer, int c, + size_t n) const { + ::memset(buffer, c, n); + } +}; +} // end namespace Eigen + +#endif // EIGEN_CXX11_TENSOR_TENSOR_DEVICE_SYCL_H |