Transfer files from RAD repository

[ROCm/rocshmem commit: ea8f264a11]

projects/rocshmem/src/device_proxy.hpp

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+/******************************************************************************
+ * Copyright (c) 2024 Advanced Micro Devices, Inc. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *****************************************************************************/
+
+#ifndef LIBRARY_SRC_DEVICE_PROXY_HPP_
+#define LIBRARY_SRC_DEVICE_PROXY_HPP_
+
+#include <hip/hip_runtime.h>
+
+#include <memory>
+#include <utility>
+
+namespace rocshmem {
+
+template <typename ALLOCATOR, typename T, size_t SIZE_IN = 1>
+class DeviceProxy {
+ public:
+  DeviceProxy() {
+    /*
+     * Allocate memory and verify that the allocation worked.
+     */
+    T* temp{nullptr};
+    allocator_.allocate(reinterpret_cast<void**>(&temp), SIZE_BYTES_);
+    assert(temp);
+
+    /*
+     * Default memory provided by the allocation to recognizable bytes.
+     */
+    memset(static_cast<void*>(temp), 0xBC, SIZE_BYTES_);
+
+    /*
+     * Pass the memory into a unique ptr for tracking.
+     */
+    std::unique_ptr<T, Deleter> up{temp};
+    up_ = std::move(up);
+
+    /*
+     * Set a c-style ptr for access by the device.
+     */
+    ptr_ = up_.get();
+  }
+
+  /**
+   * @brief Return internal storage tracked by the Proxy.
+   *
+   * @note Do not try to free this memory yourself. The proxy maintains
+   * the lifetime of the data itself.
+   */
+  __host__ __device__ T* get() { return ptr_; }
+
+ private:
+  /**
+   * @brief Internal Deleter functor is required by up_ member
+   */
+  class Deleter {
+   public:
+    void operator()(void* x) { a_.deallocate(x); }
+
+   private:
+    ALLOCATOR a_;
+  };
+
+  /**
+   * @brief Externally provided allocator type.
+   */
+  ALLOCATOR allocator_{};
+
+  /**
+   * @brief Unique pointer for tracking the proxy.
+   */
+  std::unique_ptr<T, Deleter> up_{nullptr};
+
+  /**
+   * @brief A handle to access the internal memory.
+   *
+   * In general, device code cannot access standard library routines
+   * like std::unique_ptr::get(). Circumvent this problem by caching
+   * the pointer manually in this class.
+   */
+  T* ptr_{nullptr};
+
+  /**
+   * @brief The allocation size for the internal memory
+   */
+  static constexpr size_t SIZE_BYTES_{sizeof(T) * SIZE_IN};
+};
+
+}  // namespace rocshmem
+
+#endif  // LIBRARY_SRC_DEVICE_PROXY_HPP_