feature: add debug flag to ignore product specific ioctl helper creation

Related-To: NEO-13527
Signed-off-by: Mateusz Jablonski <mateusz.jablonski@intel.com>

shared/source/debug_settings/debug_variables_base.inl

@@ -89,6 +89,7 @@ DECLARE_DEBUG_VARIABLE(bool, DisableGemCreateExtSetPat, false, "Do not use I915_
 DECLARE_DEBUG_VARIABLE(bool, SkipInOrderNonWalkerSignalingAllowed, false, "Allows for skipping non walker signalling in InOrder command lists, default: false")
 DECLARE_DEBUG_VARIABLE(bool, PipelinedPipelineSelect, false, "Restore usage of default pipeline select command")
 DECLARE_DEBUG_VARIABLE(bool, AbortHostSyncOnNonHostVisibleEvent, false, "Aborts execution when user calls zeEventHostSynchronize on event without host signal scope")
+DECLARE_DEBUG_VARIABLE(bool, IgnoreProductSpecificIoctlHelper, false, "When set then product specific ioctl helper is not created even if available, generic one is used")
 DECLARE_DEBUG_VARIABLE(std::string, ForceDeviceId, std::string("unk"), "Override device id in AUB/TBX mode")
 DECLARE_DEBUG_VARIABLE(std::string, FilterDeviceId, std::string("unk"), "Device id filter, adapter matching device id will be opened; ignored when unk")
 DECLARE_DEBUG_VARIABLE(std::string, FilterBdfPath, std::string("unk"), "Linux-only, BDF path filter, only matching paths will be opened; ignored when unk")

shared/source/os_interface/linux/drm_neo.cpp

@@ -1092,7 +1092,7 @@ bool Drm::completionFenceSupport() {
 void Drm::setupIoctlHelper(const PRODUCT_FAMILY productFamily) {
     if (!this->ioctlHelper) {
         auto productSpecificIoctlHelperCreator = ioctlHelperFactory[productFamily];
-        if (productSpecificIoctlHelperCreator) {
+        if (productSpecificIoctlHelperCreator && !debugManager.flags.IgnoreProductSpecificIoctlHelper.get()) {
             this->ioctlHelper = productSpecificIoctlHelperCreator.value()(*this);
         } else {
             std::string prelimVersion = "";

shared/test/common/test_files/igdrcl.config

@@ -46,6 +46,7 @@ InjectInternalBuildOptions = unk
 InjectApiBuildOptions = unk
 OverrideCsrAllocationSize = -1
 AbortHostSyncOnNonHostVisibleEvent = 0
+IgnoreProductSpecificIoctlHelper = 0
 ForceL1Caching = -1
 UseKmdMigration = -1
 CreateKmdMigratedSharedAllocationWithMultipleBOs = -1

shared/test/unit_test/os_interface/linux/drm_tests.cpp

@@ -2230,3 +2230,53 @@ TEST(DistanceInfoTest, givenDistanceInfosWhenAssignRegionsFromDistancesThenCorre
     EXPECT_EQ(1024u, memoryInfo->getMemoryRegionSize(2));
     EXPECT_ANY_THROW(memoryInfo->getMemoryRegionSize(4));
 }
+
+TEST(DrmTest, GivenProductSpecificIoctlHelperAvailableWhenSetupIoctlHelperThenCreateProductSpecificOne) {
+    auto executionEnvironment = std::make_unique<MockExecutionEnvironment>();
+    DrmMock drm{*executionEnvironment->rootDeviceEnvironments[0]};
+    drm.ioctlHelper.reset();
+
+    auto productFamily = defaultHwInfo->platform.eProductFamily;
+    VariableBackup<std::optional<std::function<std::unique_ptr<IoctlHelper>(Drm & drm)>>> createFuncBackup{&ioctlHelperFactory[productFamily]};
+
+    static uint32_t customFuncCalled = 0;
+
+    ioctlHelperFactory[productFamily] = [](Drm &drm) -> std::unique_ptr<IoctlHelper> {
+        EXPECT_EQ(0u, customFuncCalled);
+        customFuncCalled++;
+
+        return std::make_unique<MockIoctlHelper>(drm);
+    };
+
+    customFuncCalled = 0;
+
+    drm.setupIoctlHelper(productFamily);
+
+    EXPECT_EQ(1u, customFuncCalled);
+}
+
+TEST(DrmTest, GivenProductSpecificIoctlHelperAvailableAndDebugFlagToIgnoreIsSetWhenSetupIoctlHelperThenDontCreateProductSpecificOne) {
+    DebugManagerStateRestore restore;
+    debugManager.flags.IgnoreProductSpecificIoctlHelper.set(true);
+    auto executionEnvironment = std::make_unique<MockExecutionEnvironment>();
+    DrmMock drm{*executionEnvironment->rootDeviceEnvironments[0]};
+    drm.ioctlHelper.reset();
+
+    auto productFamily = defaultHwInfo->platform.eProductFamily;
+    VariableBackup<std::optional<std::function<std::unique_ptr<IoctlHelper>(Drm & drm)>>> createFuncBackup{&ioctlHelperFactory[productFamily]};
+
+    static uint32_t customFuncCalled = 0;
+
+    ioctlHelperFactory[productFamily] = [](Drm &drm) -> std::unique_ptr<IoctlHelper> {
+        EXPECT_EQ(0u, customFuncCalled);
+        customFuncCalled++;
+
+        return std::make_unique<MockIoctlHelper>(drm);
+    };
+
+    customFuncCalled = 0;
+
+    drm.setupIoctlHelper(productFamily);
+
+    EXPECT_EQ(0u, customFuncCalled);
+}