[SWDEV-522992] Make libdrm / libdrm_amdgpu load dynamically (#43)

Changes:
- Now load libdrm/libdrm_amdgpu dynamically

Change-Id: I49fb1f3540b3235a25370f7cfcfb9778db34c2a5
Signed-off-by: Charis Poag <Charis.Poag@amd.com>

include/rocm_smi/amdgpu_drm.h

@@ -29,10 +29,15 @@
  *    Keith Whitwell <keith@tungstengraphics.com>
  */
 
-#ifndef __AMDGPU_DRM_H__
-#define __AMDGPU_DRM_H__
+#ifndef __LIBDRM_AMDGPU__
+#define __LIBDRM_AMDGPU__
+#include <libdrm/amdgpu.h>
+#endif
 
-#include "drm.h"
+#ifndef __LIBDRM__
+#define __LIBDRM__
+#include <libdrm/drm.h>
+#endif
 
 #if defined(__cplusplus)
 extern "C" {
@@ -1295,5 +1300,3 @@ struct drm_color_ctm_3x4 {
 #if defined(__cplusplus)
 }
 #endif
-
-#endif

include/rocm_smi/rocm_smi.h

@@ -134,6 +134,8 @@ typedef enum {
   RSMI_STATUS_AMDGPU_RESTART_ERR,        //!< Could not successfully restart
                                          //!< the amdgpu driver
   RSMI_STATUS_DRM_ERROR,                 //!< Error when call libdrm
+  RSMI_STATUS_FAIL_LOAD_MODULE,          //!< Fail to load lib
+  RSMI_STATUS_FAIL_LOAD_SYMBOL,          //!< Fail to load symbol
 
   RSMI_STATUS_UNKNOWN_ERROR = 0xFFFFFFFF,  //!< An unknown error occurred
 } rsmi_status_t;

include/rocm_smi/rocm_smi_lib_loader.h

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 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 ROCM_SMI_INCLUDE_ROCM_SMI_LIB_LOADER_H_
+#define ROCM_SMI_INCLUDE_ROCM_SMI_LIB_LOADER_H_
+#include <dlfcn.h>
+#include <string.h>
+
+#include <map>
+#include <iostream>
+#include <mutex>   //  NOLINT(build/c++11)
+
+#include "rocm_smi/rocm_smi.h"
+
+
+namespace amd {
+namespace smi {
+class ROCmSmiLibraryLoader {
+ public:
+     ROCmSmiLibraryLoader();
+
+     rsmi_status_t load(const char* filename);
+
+     template<typename T> rsmi_status_t load_symbol(T* func_handler,
+            const char* func_name);
+
+
+     rsmi_status_t unload();
+
+     ~ROCmSmiLibraryLoader();
+
+ private:
+     void* libHandler_;
+     std::mutex library_mutex_;
+     bool library_loaded_ = false;
+};
+
+template<typename T> rsmi_status_t ROCmSmiLibraryLoader::load_symbol(
+            T* func_handler,
+            const char* func_name) {
+    if (!libHandler_) {
+        return RSMI_STATUS_FAIL_LOAD_MODULE;
+    }
+
+    if (!func_handler || !func_name) {
+        return RSMI_STATUS_FAIL_LOAD_SYMBOL;
+    }
+
+    std::lock_guard<std::mutex> guard(library_mutex_);
+
+    *reinterpret_cast<void**>(func_handler) =
+            dlsym(libHandler_, func_name);
+    if (*func_handler == nullptr) {
+        char* error = dlerror();
+        std::cerr << "ROCmSmiLibraryLoader: Fail to load the symbol "
+                    << func_name << ": " << error << std::endl;
+        return RSMI_STATUS_FAIL_LOAD_SYMBOL;
+    }
+
+    return RSMI_STATUS_SUCCESS;
+}
+
+}  // namespace smi
+}  // namespace amd
+
+
+#endif  // ROCM_SMI_INCLUDE_ROCM_SMI_LIB_LOADER_H_