Add debug flag to loop at initialize.

- This is to help debugging applications that requires attaching to them.

Change-Id: Ia7923c231b925ab9a473a70fb5fcc13fd99db1ca

runtime/os_interface/DebugVariables_base.inl

@@ -47,6 +47,7 @@ DECLARE_DEBUG_VARIABLE(bool, DisableResourceRecycling, false, "when set to true
 DECLARE_DEBUG_VARIABLE(bool, ForceDispatchScheduler, false, "dispatches scheduler kernel instead of kernel enqueued")
 DECLARE_DEBUG_VARIABLE(bool, TrackParentEvents, false, "events track their parents")
 DECLARE_DEBUG_VARIABLE(bool, RebuildPrecompiledKernels, false, "forces driver to recompile precompiled kernels from sources")
+DECLARE_DEBUG_VARIABLE(bool, LoopAtPlatformInitialize, false, "Adds endless loop in platform initalize, useful for debugging.")
 /*LOGGING FLAGS*/
 DECLARE_DEBUG_VARIABLE(bool, PrintDebugMessages, false, "when enabled, some debug messages will be propagated to console")
 DECLARE_DEBUG_VARIABLE(bool, DumpKernels, false, "Enables dumping kernels' program source code to text files and program from binary to bin file")

runtime/platform/platform.cpp

@@ -33,6 +33,7 @@
 #include "runtime/helpers/options.h"
 #include "runtime/helpers/string.h"
 #include "runtime/os_interface/device_factory.h"
+#include "runtime/os_interface/debug_settings_manager.h"
 #include "runtime/event/async_events_handler.h"
 #include "runtime/sharings/sharing_factory.h"
 #include "runtime/platform/extensions.h"
@@ -138,6 +139,11 @@ bool Platform::initialize() {
         return true;
     }
 
+    if (DebugManager.flags.LoopAtPlatformInitialize.get()) {
+        while (DebugManager.flags.LoopAtPlatformInitialize.get())
+            this->initializationLoopHelper();
+    }
+
     state = OCLRT::getDevices(&hwInfo, numDevicesReturned, *executionEnvironment) ? StateIniting : StateNone;
 
     if (state == StateNone) {

runtime/platform/platform.h

@@ -78,7 +78,7 @@ class Platform : public BaseObject<_cl_platform_id> {
     };
     cl_uint state = StateNone;
     void fillGlobalDispatchTable();
-
+    MOCKABLE_VIRTUAL void initializationLoopHelper(){};
     std::unique_ptr<PlatformInfo> platformInfo;
     DeviceVector devices;
     std::string compilerExtensions;

unit_tests/platform/platform_tests.cpp

@@ -24,6 +24,7 @@
 #include "runtime/device/device.h"
 #include "runtime/platform/extensions.h"
 #include "runtime/sharings/sharing_factory.h"
+#include "unit_tests/helpers/debug_manager_state_restore.h"
 #include "unit_tests/fixtures/platform_fixture.h"
 #include "unit_tests/mocks/mock_async_event_handler.h"
 #include "unit_tests/mocks/mock_csr.h"
@@ -208,3 +209,28 @@ TEST(PlatformConstructionTest, givenPlatformThatIsNotInitializedWhenGetDevicesIs
     auto devices = platform.getDevices();
     EXPECT_EQ(nullptr, devices);
 }
+
+TEST(PlatformInitLoopTests, givenPlatformWhenInitLoopHelperIsCalledThenItDoesNothing) {
+    struct mockPlatform : public Platform {
+        using Platform::initializationLoopHelper;
+    };
+    mockPlatform platform;
+    platform.initializationLoopHelper();
+}
+
+TEST(PlatformInitLoopTests, givenPlatformWithDebugSettingWhenInitIsCalledThenItEntersEndlessLoop) {
+    DebugManagerStateRestore stateRestore;
+    DebugManager.flags.LoopAtPlatformInitialize.set(true);
+    bool called = false;
+    struct mockPlatform : public Platform {
+        mockPlatform(bool &called) : called(called){};
+        void initializationLoopHelper() override {
+            DebugManager.flags.LoopAtPlatformInitialize.set(false);
+            called = true;
+        }
+        bool &called;
+    };
+    mockPlatform platform(called);
+    platform.initialize();
+    EXPECT_TRUE(called);
+}

unit_tests/test_files/igdrcl.config

@@ -77,4 +77,5 @@ AUBDumpFilterKernelStartIdx = 0
 AUBDumpFilterKernelEndIdx = -1
 RebuildPrecompiledKernels = false
 CreateMultipleDevices = 0
-EnableExperimentalCommandBuffer = 0
+EnableExperimentalCommandBuffer = 0
+LoopAtPlatformInitialize = false