Switching mechanism for promotion policies

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

inc/ocf.h

@@ -24,6 +24,7 @@
 #include "ocf_cleaner.h"
 #include "cleaning/alru.h"
 #include "cleaning/acp.h"
+#include "promotion/nhit.h"
 #include "ocf_metadata.h"
 #include "ocf_metadata_updater.h"
 #include "ocf_io_class.h"

inc/ocf_mngt.h

@@ -778,7 +778,7 @@ int ocf_mngt_cache_cleaning_set_param(ocf_cache_t cache, ocf_cleaning_t type,
  * @param[in] cache Cache handle
  * @param[in] type Cleaning policy type
  * @param[in] param_id Cleaning policy parameter id
- * @param[in] param_value Variable to store parameter value
+ * @param[out] param_value Variable to store parameter value
  *
  * @retval 0 Parameter has been get successfully
  * @retval Non-zero Error occurred and parameter has not been get
@@ -786,6 +786,55 @@ int ocf_mngt_cache_cleaning_set_param(ocf_cache_t cache, ocf_cleaning_t type,
 int ocf_mngt_cache_cleaning_get_param(ocf_cache_t cache,ocf_cleaning_t type,
 		uint32_t param_id, uint32_t *param_value);
 
+/**
+ * @brief Set promotion policy in given cache
+ *
+ * @attention This changes only runtime state. To make changes persistent
+ *            use function ocf_mngt_cache_save().
+ *
+ * @param[in] cache Cache handle
+ * @param[in] type Promotion policy type
+ *
+ * @retval 0 Policy has been set successfully
+ * @retval Non-zero Error occurred and policy has not been set
+ */
+int ocf_mngt_cache_promotion_set_policy(ocf_cache_t cache, ocf_promotion_t type);
+
+/**
+ * @brief Get promotion policy in given cache
+ *
+ * @param[in] cache Cache handle
+ *
+ * @retval Currently set promotion policy type
+ */
+ocf_promotion_t ocf_mngt_cache_promotion_get_policy(ocf_cache_t cache);
+
+/**
+ * @brief Set promotion policy parameter for given cache
+ *
+ * @param[in] cache Cache handle
+ * @param[in] param_id Promotion policy parameter id
+ * @param[in] param_value Promotion policy parameter value
+ *
+ * @retval 0 Parameter has been set successfully
+ * @retval Non-zero Error occurred and parameter has not been set
+ */
+int ocf_mngt_cache_promotion_set_param(ocf_cache_t cache, uint8_t param_id,
+		uint64_t param_value);
+
+/**
+ * @brief Get promotion policy parameter for given cache
+ *
+ * @param[in] cache Cache handle
+ * @param[in] param_id Promotion policy parameter id
+ * @param[out] param_value Variable to store parameter value
+ *
+ * @retval 0 Parameter has been retrieved successfully
+ * @retval Non-zero Error occurred and parameter has not been retrieved
+ */
+int ocf_mngt_cache_promotion_get_param(ocf_cache_t cache, uint8_t param_id,
+		uint64_t *param_value);
+
 /**
  * @brief IO class configuration
  */

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__ */