Debug mask support to force uncached Gmm usage type

Signed-off-by: Bartosz Dunajski <bartosz.dunajski@intel.com>

Author: BartoszDunajski

opencl/test/unit_test/gmm_helper/gmm_helper_tests.cpp

@@ -939,6 +939,24 @@ TEST(GmmTest, givenConstSurfaceWhenDebugFlagIsSetThenReturnUncachedType) {
               CacheSettingsHelper::getGmmUsageType(AllocationType::CONSTANT_SURFACE, false, *defaultHwInfo));
 }
 
+TEST(GmmTest, givenUncachedDebugFlagMaskSetWhenAskingForUsageTypeThenReturnUncached) {
+    DebugManagerStateRestore restore;
+
+    constexpr int64_t bufferMask = 1 << (static_cast<int64_t>(AllocationType::BUFFER) - 1);
+    constexpr int64_t imageMask = 1 << (static_cast<int64_t>(AllocationType::IMAGE) - 1);
+
+    DebugManager.flags.ForceUncachedGmmUsageType.set(bufferMask | imageMask);
+
+    EXPECT_EQ(GMM_RESOURCE_USAGE_OCL_BUFFER_CACHELINE_MISALIGNED,
+              CacheSettingsHelper::getGmmUsageType(AllocationType::BUFFER, false, *defaultHwInfo));
+
+    EXPECT_EQ(GMM_RESOURCE_USAGE_OCL_BUFFER_CACHELINE_MISALIGNED,
+              CacheSettingsHelper::getGmmUsageType(AllocationType::IMAGE, false, *defaultHwInfo));
+
+    EXPECT_NE(GMM_RESOURCE_USAGE_OCL_BUFFER_CACHELINE_MISALIGNED,
+              CacheSettingsHelper::getGmmUsageType(AllocationType::BUFFER_HOST_MEMORY, false, *defaultHwInfo));
+}
+
 TEST(GmmTest, givenAllocationForStatefulAccessWhenDebugFlagIsSetThenReturnUncachedType) {
     DebugManagerStateRestore restore;
     DebugManager.flags.DisableCachingForStatefulBufferAccess.set(true);

opencl/test/unit_test/test_files/igdrcl.config

@@ -422,4 +422,5 @@ DirectSubmissionInsertSfenceInstructionPriorToSubmission = -1
 EnableTimestampWaitForEvents = -1
 ForceWddmLowPriorityContextValue = -1
 EnableDebuggerMmapMemoryAccess = 0
-FailBuildProgramWithStatefulAccess = -1
+FailBuildProgramWithStatefulAccess = -1
+ForceUncachedGmmUsageType = 0

shared/source/debug_settings/debug_variables_base.inl

@@ -417,6 +417,7 @@ DECLARE_DEBUG_VARIABLE(int32_t, ForceDefaultHeapSize, -1, "-1: no force (64kb),
 DECLARE_DEBUG_VARIABLE(int32_t, PreferCopyEngineForCopyBufferToBuffer, -1, "-1: default, 0: prefer EUs, 1: prefer blitter")
 DECLARE_DEBUG_VARIABLE(int64_t, ForceSystemMemoryPlacement, 0, "0: default,  >0: (bitmask) for given Graphics Allocation Type, force system memory placement")
 DECLARE_DEBUG_VARIABLE(int64_t, ForceNonSystemMemoryPlacement, 0, "0: default,  >0: (bitmask) for given Graphics Allocation Type, force non-system memory placement")
+DECLARE_DEBUG_VARIABLE(int64_t, ForceUncachedGmmUsageType, 0, "0: default,  >0: (bitmask) for given Graphics Allocation Type, force uncached gmm resource type")
 DECLARE_DEBUG_VARIABLE(int64_t, DisableIndirectAccess, -1, "0: default,  0: Use indirect access settings provided by application, 1: Disable indirect access and ignore settings provided by application")
 DECLARE_DEBUG_VARIABLE(int32_t, UseVmBind, -1, "Use new residency model on Linux (requires kernel support), -1: default, 0: disabled, 1: enabled")
 DECLARE_DEBUG_VARIABLE(int32_t, PassBoundBOToExec, -1, "Pass bound BOs to exec call to keep dependencies")

shared/source/gmm_helper/cache_settings_helper.cpp

@@ -15,6 +15,12 @@
 namespace NEO {
 
 GMM_RESOURCE_USAGE_TYPE_ENUM CacheSettingsHelper::getGmmUsageType(AllocationType allocationType, bool forceUncached, const HardwareInfo &hwInfo) {
+    if (DebugManager.flags.ForceUncachedGmmUsageType.get()) {
+        if ((1llu << (static_cast<int64_t>(allocationType) - 1)) & DebugManager.flags.ForceUncachedGmmUsageType.get()) {
+            forceUncached = true;
+        }
+    }
+
     if (forceUncached || DebugManager.flags.ForceAllResourcesUncached.get()) {
         return getDefaultUsageTypeWithCachingDisabled(allocationType);
     } else {