123 lines
5.1 KiB
C++
123 lines
5.1 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Mehdi Goli Codeplay Software Ltd.
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// Ralph Potter Codeplay Software Ltd.
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// Luke Iwanski Codeplay Software Ltd.
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// Contact: <eigen@codeplay.com>
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// Copyright (C) 2016 Benoit Steiner <benoit.steiner.goog@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at the mozilla.org home page
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#if defined(EIGEN_USE_SYCL) && !defined(EIGEN_CXX11_TENSOR_TENSOR_DEVICE_SYCL_H)
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#define EIGEN_CXX11_TENSOR_TENSOR_DEVICE_SYCL_H
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namespace Eigen {
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struct SyclDevice {
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/// class members
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/// sycl queue
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mutable cl::sycl::queue m_queue;
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/// std::map is the container used to make sure that we create only one buffer
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/// per pointer. The lifespan of the buffer now depends on the lifespan of SyclDevice.
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/// If a non-read-only pointer is needed to be accessed on the host we should manually deallocate it.
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mutable std::map<const void *, std::shared_ptr<void>> buffer_map;
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/// creating device by using selector
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template<typename dev_Selector> SyclDevice(dev_Selector s)
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:
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#ifdef EIGEN_EXCEPTIONS
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m_queue(cl::sycl::queue(s, [=](cl::sycl::exception_list l) {
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for (const auto& e : l) {
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try {
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std::rethrow_exception(e);
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} catch (cl::sycl::exception e) {
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std::cout << e.what() << std::endl;
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}
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}
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}))
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#else
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m_queue(cl::sycl::queue(s))
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#endif
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{}
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// destructor
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~SyclDevice() { deallocate_all(); }
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template <typename T> void deallocate(T *p) const {
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auto it = buffer_map.find(p);
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if (it != buffer_map.end()) {
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buffer_map.erase(it);
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internal::aligned_free(p);
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}
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}
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void deallocate_all() const {
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std::map<const void *, std::shared_ptr<void>>::iterator it=buffer_map.begin();
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while (it!=buffer_map.end()) {
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auto p=it->first;
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buffer_map.erase(it);
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internal::aligned_free(const_cast<void*>(p));
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it=buffer_map.begin();
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}
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buffer_map.clear();
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}
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/// creation of sycl accessor for a buffer. This function first tries to find
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/// the buffer in the buffer_map. If found it gets the accessor from it, if not,
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///the function then adds an entry by creating a sycl buffer for that particular pointer.
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template <cl::sycl::access::mode AcMd, typename T> inline cl::sycl::accessor<T, 1, AcMd, cl::sycl::access::target::global_buffer>
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get_sycl_accessor(size_t num_bytes, cl::sycl::handler &cgh, const T * ptr) const {
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return (get_sycl_buffer<T>(num_bytes, ptr)->template get_access<AcMd, cl::sycl::access::target::global_buffer>(cgh));
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}
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template<typename T> inline std::pair<std::map<const void *, std::shared_ptr<void>>::iterator,bool> add_sycl_buffer(const T *ptr, size_t num_bytes) const {
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using Type = cl::sycl::buffer<T, 1>;
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std::pair<std::map<const void *, std::shared_ptr<void>>::iterator,bool> ret = buffer_map.insert(std::pair<const void *, std::shared_ptr<void>>(ptr, std::shared_ptr<void>(new Type(cl::sycl::range<1>(num_bytes)),
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[](void *dataMem) { delete static_cast<Type*>(dataMem); })));
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(static_cast<Type*>(buffer_map.at(ptr).get()))->set_final_data(nullptr);
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return ret;
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}
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template <typename T> inline cl::sycl::buffer<T, 1>* get_sycl_buffer(size_t num_bytes,const T * ptr) const {
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return static_cast<cl::sycl::buffer<T, 1>*>(add_sycl_buffer(ptr, num_bytes).first->second.get());
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}
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/// allocating memory on the cpu
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EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void *allocate(size_t) const {
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return internal::aligned_malloc(8);
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}
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// some runtime conditions that can be applied here
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bool isDeviceSuitable() const { return true; }
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EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void memcpy(void *dst, const void *src, size_t n) const {
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::memcpy(dst, src, n);
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}
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template<typename T> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void memcpyHostToDevice(T *dst, const T *src, size_t n) const {
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auto host_acc= (static_cast<cl::sycl::buffer<T, 1>*>(add_sycl_buffer(dst, n).first->second.get()))-> template get_access<cl::sycl::access::mode::discard_write, cl::sycl::access::target::host_buffer>();
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memcpy(host_acc.get_pointer(), src, n);
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}
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/// whith the current implementation of sycl, the data is copied twice from device to host. This will be fixed soon.
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template<typename T> EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void memcpyDeviceToHost(T *dst, const T *src, size_t n) const {
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auto it = buffer_map.find(src);
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if (it != buffer_map.end()) {
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auto host_acc= (static_cast<cl::sycl::buffer<T, 1>*>(it->second.get()))-> template get_access<cl::sycl::access::mode::read, cl::sycl::access::target::host_buffer>();
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memcpy(dst,host_acc.get_pointer(), n);
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} else{
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eigen_assert("no device memory found. The memory might be destroyed before creation");
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}
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}
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EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void memset(void *buffer, int c, size_t n) const {
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::memset(buffer, c, n);
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}
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EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE int majorDeviceVersion() const {
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return 1;
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}
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};
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} // end namespace Eigen
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#endif // EIGEN_CXX11_TENSOR_TENSOR_DEVICE_SYCL_H
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