Support for Diagnostics lazy init in zeInit flow

Modifications for Diagnostics module lazy init

Related-To: LOCI-3127

Signed-off-by: Kulkarni, Ashwin Kumar <ashwin.kumar.kulkarni@intel.com>

level_zero/tools/source/sysman/diagnostics/diagnostics.cpp

@@ -34,6 +34,9 @@ void DiagnosticsHandleContext::init() {
 }
 
 ze_result_t DiagnosticsHandleContext::diagnosticsGet(uint32_t *pCount, zes_diag_handle_t *phDiagnostics) {
+    std::call_once(initDiagnosticsOnce, [this]() {
+        this->init();
+    });
     uint32_t handleListSize = static_cast<uint32_t>(handleList.size());
     uint32_t numToCopy = std::min(*pCount, handleListSize);
     if (0 == *pCount || *pCount > handleListSize) {

level_zero/tools/source/sysman/diagnostics/diagnostics.h

@@ -9,6 +9,7 @@
 #include "level_zero/core/source/device/device.h"
 #include <level_zero/zes_api.h>
 
+#include <mutex>
 #include <string>
 #include <vector>
 
@@ -47,6 +48,7 @@ struct DiagnosticsHandleContext {
 
   private:
     void createHandle(const std::string &diagTests);
+    std::once_flag initDiagnosticsOnce;
 };
 
 } // namespace L0

level_zero/tools/source/sysman/sysman_imp.cpp

@@ -133,9 +133,6 @@ ze_result_t SysmanDeviceImp::init() {
     if (pFanHandleContext) {
         pFanHandleContext->init();
     }
-    if (pDiagnosticsHandleContext) {
-        pDiagnosticsHandleContext->init();
-    }
     if (pPerformanceHandleContext) {
         pPerformanceHandleContext->init(deviceHandles, hCoreDevice);
     }

level_zero/tools/test/unit_tests/sources/sysman/diagnostics/linux/test_zes_sysman_diagnostics.cpp

@@ -98,7 +98,6 @@ class ZesDiagnosticsFixture : public SysmanDeviceFixture {
         }
         pSysmanDeviceImp->pDiagnosticsHandleContext->handleList.clear();
         productFamily = pLinuxSysmanImp->getDeviceHandle()->getNEODevice()->getHardwareInfo().platform.eProductFamily;
-        pSysmanDeviceImp->pDiagnosticsHandleContext->init();
     }
 
     void TearDown() override {