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diff --git a/include/nvgpu/unit.h b/include/nvgpu/unit.h
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+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef NVGPU_UNIT_H
+#define NVGPU_UNIT_H
+
+/*
+ * Enumeration of all units intended to be used by any HAL that requires
+ * unit as parameter.
+ *
+ * Units are added to the enumeration as needed, so it is not complete.
+ */
+enum nvgpu_unit {
+        NVGPU_UNIT_FIFO,
+        NVGPU_UNIT_PERFMON,
+        NVGPU_UNIT_GRAPH,
+        NVGPU_UNIT_BLG,
+        NVGPU_UNIT_PWR,
+        NVGPU_UNIT_NVDEC,
+};
+
+#endif /* NVGPU_UNIT_H */