Lazy init implementation for RAS module

Related-To: LOCI-3127

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

level_zero/tools/source/sysman/linux/os_sysman_imp.cpp

@@ -396,4 +396,8 @@ OsSysman *OsSysman::create(SysmanDeviceImp *pParentSysmanDeviceImp) {
     LinuxSysmanImp *pLinuxSysmanImp = new LinuxSysmanImp(pParentSysmanDeviceImp);
     return static_cast<OsSysman *>(pLinuxSysmanImp);
 }
+std::vector<ze_device_handle_t> &LinuxSysmanImp::getDeviceHandles() {
+    return pParentSysmanDeviceImp->deviceHandles;
+}
+
 } // namespace L0

level_zero/tools/source/sysman/linux/os_sysman_imp.h

@@ -52,6 +52,7 @@ class LinuxSysmanImp : public OsSysman, NEO::NonCopyableOrMovableClass {
     NEO::Drm &getDrm();
     PlatformMonitoringTech *getPlatformMonitoringTechAccess(uint32_t subDeviceId);
     Device *getDeviceHandle();
+    std::vector<ze_device_handle_t> &getDeviceHandles() override;
     SysmanDeviceImp *getSysmanDeviceImp();
     std::string getPciCardBusDirectoryPath(std::string realPciPath);
     void releasePmtObject();

level_zero/tools/source/sysman/os_sysman.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020-2021 Intel Corporation
+ * Copyright (C) 2020-2022 Intel Corporation
  *
  * SPDX-License-Identifier: MIT
  *
@@ -7,6 +7,9 @@
 
 #pragma once
 #include <level_zero/zes_api.h>
+
+#include <vector>
+
 namespace L0 {
 
 struct SysmanDeviceImp;
@@ -16,6 +19,7 @@ struct OsSysman {
 
     virtual ze_result_t init() = 0;
     static OsSysman *create(SysmanDeviceImp *pSysmanImp);
+    virtual std::vector<ze_device_handle_t> &getDeviceHandles() = 0;
 };
 
 } // namespace L0

level_zero/tools/source/sysman/ras/ras.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020-2021 Intel Corporation
+ * Copyright (C) 2020-2022 Intel Corporation
  *
  * SPDX-License-Identifier: MIT
  *
@@ -7,6 +7,7 @@
 
 #include "shared/source/helpers/basic_math.h"
 
+#include "level_zero/tools/source/sysman/os_sysman.h"
 #include "level_zero/tools/source/sysman/ras/ras_imp.h"
 
 namespace L0 {
@@ -38,6 +39,9 @@ void RasHandleContext::init(std::vector<ze_device_handle_t> &deviceHandles) {
 }
 ze_result_t RasHandleContext::rasGet(uint32_t *pCount,
                                      zes_ras_handle_t *phRas) {
+    std::call_once(initRasOnce, [this]() {
+        this->init(pOsSysman->getDeviceHandles());
+    });
     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/ras/ras.h

@@ -9,6 +9,7 @@
 #include "level_zero/core/source/device/device.h"
 #include <level_zero/zes_api.h>
 
+#include <mutex>
 #include <vector>
 
 struct _zes_ras_handle_t {
@@ -48,6 +49,7 @@ struct RasHandleContext {
 
   private:
     void createHandle(zes_ras_error_type_t type, ze_device_handle_t deviceHandle);
+    std::once_flag initRasOnce;
 };
 
 } // namespace L0

level_zero/tools/source/sysman/sysman_imp.cpp

@@ -121,9 +121,6 @@ ze_result_t SysmanDeviceImp::init() {
     if (pSchedulerHandleContext) {
         pSchedulerHandleContext->init(deviceHandles);
     }
-    if (pRasHandleContext) {
-        pRasHandleContext->init(deviceHandles);
-    }
     if (pMemoryHandleContext) {
         pMemoryHandleContext->init(deviceHandles);
     }

level_zero/tools/source/sysman/windows/os_sysman_imp.cpp

@@ -52,7 +52,9 @@ FirmwareUtil *WddmSysmanImp::getFwUtilInterface() {
 Device *WddmSysmanImp::getDeviceHandle() {
     return pDevice;
 }
-
+std::vector<ze_device_handle_t> &WddmSysmanImp::getDeviceHandles() {
+    return pParentSysmanDeviceImp->deviceHandles;
+}
 NEO::Wddm &WddmSysmanImp::getWddm() {
     UNRECOVERABLE_IF(nullptr == pWddm);
     return *pWddm;

level_zero/tools/source/sysman/windows/os_sysman_imp.h

@@ -30,6 +30,7 @@ class WddmSysmanImp : public OsSysman, NEO::NonCopyableOrMovableClass {
     NEO::Wddm &getWddm();
     Device *getDeviceHandle();
     void releaseFwUtilInterface();
+    std::vector<ze_device_handle_t> &getDeviceHandles() override;
 
   protected:
     FirmwareUtil *pFwUtilInterface = nullptr;