Add new debug flag allowing to not register trim callback.

Change-Id: I615be3edc9d843fb7b37cf32f2abd5e2839d6ada

runtime/os_interface/DebugVariables_base.inl

@@ -51,6 +51,7 @@ DECLARE_DEBUG_VARIABLE(bool, ForceDispatchScheduler, false, "dispatches schedule
 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.")
+DECLARE_DEBUG_VARIABLE(bool, DoNotRegisterTrimCallback, false, "When set to true driver is not registering trim callback.")
 /*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/os_interface/windows/wddm/wddm.cpp

@@ -826,6 +826,9 @@ uint64_t Wddm::getHeap32Size() {
 }
 
 void Wddm::registerTrimCallback(PFND3DKMT_TRIMNOTIFICATIONCALLBACK callback, WddmMemoryManager *memoryManager) {
+    if (DebugManager.flags.DoNotRegisterTrimCallback.get()) {
+        return;
+    }
     D3DKMT_REGISTERTRIMNOTIFICATION registerTrimNotification;
     registerTrimNotification.Callback = callback;
     registerTrimNotification.AdapterLuid = this->adapterLuid;

unit_tests/mocks/mock_wddm.h

@@ -59,6 +59,7 @@ class WddmMock : public Wddm {
     using Wddm::pagingFenceAddress;
     using Wddm::pagingQueue;
     using Wddm::preemptionMode;
+    using Wddm::trimCallbackHandle;
     using Wddm::wddmInterface;
 
     WddmMock() : Wddm(){};

unit_tests/os_interface/windows/wddm_memory_manager_tests.cpp

@@ -1107,6 +1107,14 @@ TEST_F(WddmMemoryManagerResidencyTest, trimCallbackIsRegisteredInWddmMemoryManag
     EXPECT_EQ(wddm->getDevice(), gdi->getRegisterTrimNotificationArg().hDevice);
 }
 
+TEST(WddmDebugModesTests, givenDebugModeWhenItIsActiveThenTrimCallbackIsNotRegistred) {
+    DebugManagerStateRestore stateRestore;
+    DebugManager.flags.DoNotRegisterTrimCallback.set(true);
+    WddmMock wddm;
+    wddm.init();
+    EXPECT_EQ(nullptr, wddm.trimCallbackHandle);
+}
+
 TEST_F(WddmMemoryManagerResidencyTest, givenNotUsedAllocationsFromPreviousPeriodicTrimWhenTrimResidencyPeriodicTrimIsCalledThenAllocationsAreEvictedMarkedAndRemovedFromTrimCandidateList) {
     D3DKMT_TRIMNOTIFICATION trimNotification = {0};
     trimNotification.Flags.PeriodicTrim = 1;

unit_tests/test_files/igdrcl.config

@@ -83,4 +83,5 @@ CreateMultipleDevices = 0
 EnableExperimentalCommandBuffer = 0
 LoopAtPlatformInitialize = false
 EnableTimestampPacket = false
-ReturnRawGpuTimestamps = 0
+ReturnRawGpuTimestamps = 0
+DoNotRegisterTrimCallback = false