Add query for Xnack enabled

Add system query for whether Xnack is enabled on a system.

Change-Id: I2832110e4f33f6a951d13acd06636442debf27ae


[ROCm/ROCR-Runtime commit: 22becfb1e8]

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

@@ -455,6 +455,8 @@ class Runtime {
   KfdVersion_t KfdVersion() const { return kfd_version; }
 
   bool VirtualMemApiSupported() const { return virtual_mem_api_supported_; }
+  bool XnackEnabled() const { return xnack_enabled_; }
+  void XnackEnabled(bool enable) { xnack_enabled_ = enable; }
 
  protected:
   static void AsyncEventsLoop(void*);
@@ -708,6 +710,7 @@ class Runtime {
   int GetAmdgpuDeviceArgs(Agent* agent, amdgpu_bo_handle bo, int* drm_fd, uint64_t* cpu_addr);
 
   bool virtual_mem_api_supported_;
+  bool xnack_enabled_;
 
   typedef void* ThunkHandle;
 

projects/rocr-runtime/runtime/hsa-runtime/core/runtime/amd_topology.cpp

@@ -351,6 +351,7 @@ void BuildTopology() {
 
   // Determine the Xnack mode to be bound for system
   bool xnack_mode = BindXnackMode();
+  core::Runtime::runtime_singleton_->XnackEnabled(xnack_mode);
 
   // Instantiate ROCr objects to encapsulate Gpu devices
   SurfaceGpuList(gpu_usr_list, xnack_mode, true);

projects/rocr-runtime/runtime/hsa-runtime/core/runtime/runtime.cpp

@@ -709,6 +709,10 @@ hsa_status_t Runtime::GetSystemInfo(hsa_system_info_t attribute, void* value) {
       *((bool*)value) = core::Runtime::runtime_singleton_->VirtualMemApiSupported();
       break;
     }
+    case HSA_AMD_SYSTEM_INFO_XNACK_ENABLED: {
+      *((bool*)value) = core::Runtime::runtime_singleton_->XnackEnabled();
+      break;
+    }
     default:
       return HSA_STATUS_ERROR_INVALID_ARGUMENT;
   }

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

@@ -514,6 +514,11 @@ typedef enum {
    * this attribute is bool.
    */
   HSA_AMD_SYSTEM_INFO_VIRTUAL_MEM_API_SUPPORTED = 0x205,
+  /**
+   * Returns true if XNACK is enabled on this system.  The type of
+   * this attribute is bool.
+   */
+  HSA_AMD_SYSTEM_INFO_XNACK_ENABLED = 0x206,
 } hsa_system_info_t;
 
 /**