SWDEV-268186 - OCL ReBar optimization

Change-Id: I69d8bce8d48a5b6f94a05272c83ee91fbec1688c

rocclr/device/pal/palsettings.cpp

@@ -170,6 +170,7 @@ Settings::Settings() {
   disableSdma_ = PAL_DISABLE_SDMA;
   mallPolicy_ = 0;
   alwaysResident_ = amd::IS_HIP ? true : false;
+  prepinnedMinSize_ = 0;
 }
 
 bool Settings::create(const Pal::DeviceProperties& palProp,
@@ -532,6 +533,11 @@ bool Settings::create(const Pal::DeviceProperties& palProp,
         break;
     }
   }
+  // If is Rebar, override prepinned memory size.
+  if ((heaps[Pal::GpuHeapInvisible].heapSize == 0) &&
+      (heaps[Pal::GpuHeapLocal].heapSize > 256 * Mi)) {
+    prepinnedMinSize_ = PAL_PREPINNED_MEMORY_SIZE * Ki;
+  }
 
   // Override current device settings
   override();