Change libdrm initialization

Change initialize libdrm device and file descriptor initialization
to use new APIs from Thunk. Libdrm recommends that we re-use the same
file descriptor thoughout the life of a process instead of re-creating
new one each time.

This is part of patch series for Virtual Memory API.

Change-Id: I1c0b8d1bd660cd25478b5f94c84071b90d93fc6c


[ROCm/ROCR-Runtime commit: a55f11025b]

projects/rocr-runtime/runtime/hsa-runtime/core/inc/amd_gpu_agent.h

@@ -343,6 +343,9 @@ class GpuAgent : public GpuAgentInt {
   // @brief returns true if agent uses MES scheduler
   __forceinline const bool isMES() const { return (isa_->GetMajorVersion() >= 11) ? true : false; };
 
+  // @brief returns the libdrm device handle
+  __forceinline amdgpu_device_handle libDrmDev() const { return ldrm_dev_; }
+
   void ReserveScratch();
 
   void Trim() override;
@@ -554,6 +557,9 @@ class GpuAgent : public GpuAgentInt {
   // Bind the Blit object that will drive the copy operation by engine ID
   lazy_ptr<core::Blit>& GetBlitObject(uint32_t engine_id);
 
+  // @brief initialize libdrm handle
+  void InitLibDrm();
+
   // @brief Alternative aperture base address. Only on KV.
   uintptr_t ape1_base_;
 
@@ -584,6 +590,9 @@ class GpuAgent : public GpuAgentInt {
 
   std::function<void(void*)> system_deallocator_;
 
+  // @brief device handle
+  amdgpu_device_handle ldrm_dev_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuAgent);
 
   // Check if SDMA engine by ID is free

projects/rocr-runtime/runtime/hsa-runtime/core/inc/runtime.h

@@ -52,6 +52,11 @@
 #include <utility>
 #include <thread>
 
+#if defined(__linux__)
+#include <xf86drm.h>
+#include <amdgpu.h>
+#endif
+
 #include "core/inc/hsa_ext_interface.h"
 #include "core/inc/hsa_internal.h"
 #include "core/inc/hsa_ext_amd_impl.h"