Switching mechanism for promotion policies

Signed-off-by: Jan Musial <jan.musial@intel.com>

inc/promotion/nhit.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright(c) 2019 Intel Corporation
+ * SPDX-License-Identifier: BSD-3-Clause-Clear
+ */
+
+#ifndef __OCF_PROMOTION_NHIT_H__
+#define __OCF_PROMOTION_NHIT_H__
+
+enum nhit_param {
+	nhit_insertion_threshold,
+	nhit_trigger_threshold,
+	nhit_param_max
+};
+
+#define NHIT_MIN_THRESHOLD 2
+#define NHIT_MAX_THRESHOLD 1000
+#define NHIT_THRESHOLD_DEFAULT 3
+
+#define NHIT_MIN_TRIGGER 0
+#define NHIT_MAX_TRIGGER 100
+#define NHIT_TRIGGER_DEFAULT 80
+
+#endif /* __OCF_PROMOTION_NHIT_H__ */