Restructure the folder

Move rocm_smi related function to rocm_smi folder. Move amd_smi to
top level include/ and src/ folder. Remove obsolte oam folder.
Change the CMakeLists.txt to update folder locations.

Change-Id: I52e6be739e49f3b0545865f25364787f5985e9c3

src/amd_smi/amd_smi_lib_loader.cc

@@ -0,0 +1,87 @@
+/*
+ * =============================================================================
+ * The University of Illinois/NCSA
+ * Open Source License (NCSA)
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All rights reserved.
+ *
+ * Developed by:
+ *
+ *                 AMD Research and AMD ROC Software Development
+ *
+ *                 Advanced Micro Devices, Inc.
+ *
+ *                 www.amd.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal with 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:
+ *
+ *  - Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimers.
+ *  - Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimers in
+ *    the documentation and/or other materials provided with the distribution.
+ *  - Neither the names of <Name of Development Group, Name of Institution>,
+ *    nor the names of its contributors may be used to endorse or promote
+ *    products derived from this Software without specific prior written
+ *    permission.
+ *
+ * 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 CONTRIBUTORS 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 WITH THE SOFTWARE.
+ *
+ */
+
+#include "amd_smi/impl/amd_smi_lib_loader.h"
+#include <iostream>
+
+namespace amd {
+namespace smi {
+
+AMDSmiLibraryLoader::AMDSmiLibraryLoader(): libHandler_(nullptr) {
+}
+
+amdsmi_status_t AMDSmiLibraryLoader::load(const char* filename) {
+    if (filename == nullptr) {
+        return AMDSMI_STATUS_FAIL_LOAD_MODULE;
+    }
+    if (libHandler_) {
+        unload();
+    }
+
+    std::lock_guard<std::mutex> guard(library_mutex_);
+    libHandler_ = dlopen(filename, RTLD_LAZY);
+    if (!libHandler_) {
+        char* error = dlerror();
+        std::cerr << "Fail to open " << filename <<": " << error
+                << std::endl;
+        return AMDSMI_STATUS_FAIL_LOAD_MODULE;
+    }
+
+    return AMDSMI_STATUS_SUCCESS;
+}
+
+amdsmi_status_t AMDSmiLibraryLoader::unload() {
+        std::lock_guard<std::mutex> guard(library_mutex_);
+        if (libHandler_) {
+            dlclose(libHandler_);
+            libHandler_ = nullptr;
+        }
+        return AMDSMI_STATUS_SUCCESS;
+}
+
+AMDSmiLibraryLoader::~AMDSmiLibraryLoader() {
+        unload();
+}
+
+}  // namespace rdc
+}  // namespace amd