Add debug key to disable SET_PAIR functionality

Signed-off-by: Jaime Arteaga <jaime.a.arteaga.molina@intel.com>

Source: 2c698fb

Author: Jaime Arteaga

shared/source/debug_settings/debug_variables_base.inl

@@ -493,5 +493,6 @@ DECLARE_DEBUG_VARIABLE(int32_t, OverrideDrmRegion, -1, "-1: disable, 0+: overrid
 DECLARE_DEBUG_VARIABLE(int32_t, EnableFrontEndTracking, -1, "-1: default: disabled, 0: disabled, 1: enabled. This flag creates multiple return point from List to Queue for Front End reconfiguration on Queue buffer for single List")
 DECLARE_DEBUG_VARIABLE(int32_t, EnablePipelineSelectTracking, -1, "-1: default: disabled, 0: disabled, 1: enabled. This flag enables optimization that limits number of pipeline select dispatched by command lists")
 DECLARE_DEBUG_VARIABLE(int32_t, EnableStateComputeModeTracking, -1, "-1: default: disabled, 0: disabled, 1: enabled. This flag enables tracking state compute mode changes in command lists")
+DECLARE_DEBUG_VARIABLE(int32_t, EnableSetPair, -1, "Use SET_PAIR to pair two buffer objects behind the same file descriptor, -1: default, 0: disabled, 1: enabled")
 /* Binary Cache */
 DECLARE_DEBUG_VARIABLE(bool, BinaryCacheTrace, false, "enable cl_cache to produce .trace files with information about hash computation")

shared/source/os_interface/linux/drm_neo.cpp

@@ -1272,6 +1272,9 @@ void Drm::waitForBind(uint32_t vmHandleId) {
 }
 
 bool Drm::isSetPairAvailable() {
+    if (DebugManager.flags.EnableSetPair.get() == 0) {
+        return static_cast<bool>(DebugManager.flags.EnableSetPair.get());
+    }
     std::call_once(checkSetPairOnce, [this]() {
         int ret = ioctlHelper->isSetPairAvailable();
         setPairAvailable = ret;

shared/test/common/test_files/igdrcl.config

@@ -172,6 +172,7 @@ ProgramStallCommandForSelfCleanup = -1
 RenderCompressedImagesEnabled = -1
 RenderCompressedBuffersEnabled = -1
 EnableStateComputeModeTracking = -1
+EnableSetPair = -1
 EnableUsmConcurrentAccessSupport = 0
 EnableSharedSystemUsmSupport = -1
 EnablePassInlineData = -1

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

@@ -1180,7 +1180,7 @@ TEST(DrmResidencyHandlerTests, givenDebugFlagUseVmBindSetDefaultWhenQueryingIsVm
     EXPECT_EQ(1u, drm.context.vmBindQueryCalled);
 }
 
-TEST(DrmResidencyHandlerTests, whenQueryingForSetPairAvailableAndNoSupportAvailableThenExpectedValueIsReturned) {
+TEST(DrmSetPairTests, whenQueryingForSetPairAvailableAndNoSupportAvailableThenExpectedValueIsReturned) {
     auto executionEnvironment = std::make_unique<MockExecutionEnvironment>();
     DrmQueryMock drm{*executionEnvironment->rootDeviceEnvironments[0]};
     drm.context.setPairQueryValue = 0;
@@ -1194,6 +1194,22 @@ TEST(DrmResidencyHandlerTests, whenQueryingForSetPairAvailableAndNoSupportAvaila
     EXPECT_EQ(1u, drm.context.setPairQueryCalled);
 }
 
+TEST(DrmSetPairTests, whenQueryingForSetPairAvailableAndDebugKeyNotSetThenNoSupportIsReturned) {
+    DebugManagerStateRestore restorer;
+    DebugManager.flags.EnableSetPair.set(0);
+    auto executionEnvironment = std::make_unique<MockExecutionEnvironment>();
+    DrmQueryMock drm{*executionEnvironment->rootDeviceEnvironments[0]};
+    drm.context.setPairQueryValue = 0;
+    drm.context.setPairQueryReturn = 0;
+    EXPECT_FALSE(drm.setPairAvailable);
+
+    EXPECT_EQ(0u, drm.context.setPairQueryCalled);
+    drm.callBaseIsSetPairAvailable = true;
+    EXPECT_FALSE(drm.isSetPairAvailable());
+    EXPECT_FALSE(drm.setPairAvailable);
+    EXPECT_EQ(0u, drm.context.setPairQueryCalled);
+}
+
 TEST(DrmResidencyHandlerTests, whenQueryingForSetPairAvailableAndVmBindAvailableThenBothExpectedValueIsReturned) {
     DebugManagerStateRestore restorer;
     DebugManager.flags.UseVmBind.set(-1);