/*
 * BSD LICENSE
 *
 * Copyright(c) 2018-2022 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.O
 *
 */

/**
 * @brief Internal header file for resctrl minitoring functions
 */

#ifndef __PQOS_RESCTRL_MON_H__
#define __PQOS_RESCTRL_MON_H__

#ifdef __cplusplus
extern "C" {
#endif

#include "pqos.h"
#include "types.h"

/**
 * @brief Initializes resctrl structures used for OS monitoring interface
 *
 * @param cpu cpu topology structure
 * @param cap capabilities structure
 *
 * @return Operational status
 * @retval PQOS_RETVAL_OK success
 */
PQOS_LOCAL int resctrl_mon_init(const struct pqos_cpuinfo *cpu,
                                const struct pqos_cap *cap);

/**
 * @brief Shuts down monitoring sub-module for resctrl monitoring
 *
 * @return Operation status
 * @retval PQOS_RETVAL_OK success
 */
PQOS_LOCAL int resctrl_mon_fini(void);

/**
 * @brief This function starts resctrl event counters
 *
 * @param group monitoring structure
 *
 * @return Operation status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int resctrl_mon_start(struct pqos_mon_data *group);

/**
 * @brief Function to stop resctrl event counters
 *
 * @param group monitoring structure
 *
 * @return Operation status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int resctrl_mon_stop(struct pqos_mon_data *group);

/**
 * @brief This function polls all resctrl counters
 *
 * Reads counters for all events and stores values
 *
 * @param group monitoring structure
 *
 * @return Operation status
 * @retval PQOS_RETVAL_OK on success
 * @retval PQOS_RETVAL_ERROR if error occurs
 */
PQOS_LOCAL int resctrl_mon_poll(struct pqos_mon_data *group,
                                const enum pqos_mon_event event);

/**
 * @brief Reset of resctrl monitoring
 *
 * @return Operations status
 * @return PQOS_RETVAL_RESOURCE when resctrl monitoring is not supported
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int resctrl_mon_reset(void);

/**
 * @brief Check if event is supported by resctrl
 *
 * @param event PQoS event to check
 *
 * @retval 0 if not supported
 */
PQOS_LOCAL int resctrl_mon_is_event_supported(const enum pqos_mon_event event);

/**
 * @brief Read association of \a lcore with monitoring group
 *
 * @param [in] lcore CPU logical core id
 * @param [out] name name of monitoring group
 * @param [in] name_size length of \a name buffer
 *
 * @return Operations status
 * @retval PQOS_RETVAL_RESOURCE when \a lcore is not assigned to monitoring
 *         group
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int resctrl_mon_assoc_get(const unsigned lcore,
                                     char *name,
                                     const unsigned name_size);

/**
 * @brief Set association of \a lcore to monitoring group
 *
 * @param [in] lcore CPU logical core id
 * @param [in] name name of monitoring group
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int resctrl_mon_assoc_set(const unsigned lcore, const char *name);

/**
 * @brief Read association of \a task with monitoring group
 *
 * @param [in] task task id to find association
 * @param [out] name name of monitoring group
 * @param [in] name_size length of \a name buffer
 *
 * @return Operations status
 * @retval PQOS_RETVAL_RESOURCE when \a task is not assigned to monitoring
 *         group or monitoring is not supported
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int resctrl_mon_assoc_get_pid(const pid_t task,
                                         char *name,
                                         const unsigned name_size);

/**
 * @brief Set association of \a task to monitoring group
 *
 * @param [in] task task id to be associated
 * @param [in] name name of monitoring group
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int resctrl_mon_assoc_set_pid(const pid_t task, const char *name);

/**
 * @brief Check if resctrl monitoring is active
 *
 * @param monitoring_status 1 if resctrl monitoring is active, 0 otherwise
 *
 * @return Operational status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int resctrl_mon_active(unsigned *monitoring_status);

#ifdef __cplusplus
}
#endif

#endif /* __PQOS_RESCTRL_H__ */
