/*
 * BSD LICENSE
 *
 * Copyright(c) 2017-2023 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
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.O
 *
 */

/**
 * @brief Internal header file to PQoS OS allocation module
 */

#ifndef __PQOS_OS_ALLOC_H__
#define __PQOS_OS_ALLOC_H__

#ifdef __cplusplus
extern "C" {
#endif

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

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

/**
 * @brief Shuts down allocation sub-module for OS allocation
 *
 * @return Operation status
 * @retval PQOS_RETVAL_OK success
 */
PQOS_LOCAL int os_alloc_fini(void);

/**
 * @brief Function to mount the resctrl file system with CDP or MBps options
 *
 * @param l3_cdp_cfg L3 CDP option
 * @param l2_cdp_cfg L2 CDP option
 * @param mba_cfg requested MBA config
 *
 * @return Operational status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_alloc_mount(const enum pqos_cdp_config l3_cdp_cfg,
                              const enum pqos_cdp_config l2_cdp_cfg,
                              const enum pqos_mba_config mba_cfg);

/**
 * @brief OS interface to assign first available
 *        COS to cores in \a core_array
 *
 * While searching for available COS take technologies it is intended to use
 * with into account.
 * Note on \a technology and \a core_array selection:
 * - if L2 CAT technology is requested then cores need to belong to
 *   one L2 cluster (same L2ID)
 * - if only L3 CAT is requested then cores need to belong to one socket
 *
 * @param [in] technology bit mask selecting technologies
 *             (1 << enum pqos_cap_type)
 * @param [in] core_array list of core ids
 * @param [in] core_num number of core ids in the \a core_array
 * @param [out] class_id place to store reserved COS id
 *
 * @return Operations status
 */
PQOS_LOCAL int os_alloc_assign(const unsigned technology,
                               const unsigned *core_array,
                               const unsigned core_num,
                               unsigned *class_id);

/**
 * @brief OS interface to reassign cores
 *        in \a core_array to default COS#0
 *
 * @param [in] core_array list of core ids
 * @param [in] core_num number of core ids in the \a core_array
 *
 * @return Operations status
 */
PQOS_LOCAL int os_alloc_release(const unsigned *core_array,
                                const unsigned core_num);

/**
 * @brief Assign first available COS to tasks in \a task_array
 *        Searches all COS directories from highest to lowest
 *
 * While searching for available COS take technologies it is intended to use
 * with into account.
 * Note on \a technology parameter:
 * - this parameter is currently reserved for future use
 * - resctrl (Linux interface) will only provide the highest class id common
 *   to all supported technologies
 *
 * @param [in] technology bit mask selecting technologies
 *             (1 << enum pqos_cap_type)
 * @param [in] task_array list of task ids
 * @param [in] task_num number of task ids in the \a task_array
 * @param [out] class_id place to store reserved COS id
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_alloc_assign_pid(const unsigned technology,
                                   const pid_t *task_array,
                                   const unsigned task_num,
                                   unsigned *class_id);

/**
 * @brief Reassign tasks in \a task_array to default COS#0
 *
 * @param [in] task_array list of task ids
 * @param [in] task_num number of task ids in the \a task_array
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_alloc_release_pid(const pid_t *task_array,
                                    const unsigned task_num);

/**
 * @brief Moves all cores to COS0 (default)
 *
 * @return Operation status
 */
PQOS_LOCAL int os_alloc_reset_cores(void);

/**
 * @brief Resets L3, L2 and MBA schematas to default value
 *
 * @param [in] l3_cap l3 cache capability
 * @param [in] l2_cap l2 cache capability
 * @param [in] mba_cap mba capability
 * @param [in] smba_cap smba capability
 *
 * @return Operation status
 */
PQOS_LOCAL int os_alloc_reset_schematas(const struct pqos_cap_l3ca *l3_cap,
                                        const struct pqos_cap_l2ca *l2_cap,
                                        const struct pqos_cap_mba *mba_cap,
                                        const struct pqos_cap_mba *smba_cap);

/**
 * @brief Move all tasks to COS0 (default)
 *
 * @return Operation status
 */
PQOS_LOCAL int os_alloc_reset_tasks(void);

/**
 * @brief OS interface to reset configuration of allocation technologies
 *

 * Reverts allocation state to the one after reset:
 * - all cores associated with COS0
 *
 * As part of allocation reset CDP reconfiguration can be performed.
 * This can be requested via \a cfg.
 *
 * As part of allocation reset MBA reconfiguration can be performed.
 * This can be requested via \a cfg.
 *
 * As part of allocation reset I/O RDT reconfiguration can be performed.
 * This can be requested via \a cfg.
 *
 * As part of allocation reset MBA 4.0 reconfiguration can be performed.
 * This can be requested via \a cfg.
 *
 * @param [in] cfg requested configuration
 *
 * @return Operation status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_alloc_reset(const struct pqos_alloc_config *cfg);

/**
 * @brief OS interface to set classes of service
 *        defined by \a ca on \a l3cat_id
 *
 * @param [in] l3cat_id L3 CAT resource id
 * @param [in] num_cos number of classes of service at \a ca
 * @param [in] ca table with class of service definitions
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_l3ca_set(const unsigned l3cat_id,
                           const unsigned num_cos,
                           const struct pqos_l3ca *ca);

/**
 * @brief OS interface to read classes of service from \a l3cat_id
 *
 * @param [in] l3cat_id L3 CAT resource id
 * @param [in] max_num_ca maximum number of classes of service
 *             that can be accommodated at \a ca
 * @param [out] num_ca number of classes of service read into \a ca
 * @param [out] ca table with read classes of service
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_l3ca_get(const unsigned l3cat_id,
                           const unsigned max_num_ca,
                           unsigned *num_ca,
                           struct pqos_l3ca *ca);

/**
 * @brief Check minimum cbm bits accepted by OS interface for L3 CAT
 *
 * @param [out] min_cbm_bits minimum number of bits that must be set
 *
 * @return Operational status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_l3ca_get_min_cbm_bits(unsigned *min_cbm_bits);

/**
 * @brief OS interface to set classes of
 *        service defined by \a ca on \a l2id
 *
 * @param [in] l2id unique L2 cache identifier
 * @param [in] num_cos number of classes of service at \a ca
 * @param [in] ca table with class of service definitions
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_l2ca_set(const unsigned l2id,
                           const unsigned num_cos,
                           const struct pqos_l2ca *ca);

/**
 * @brief OS interface to read classes of service from \a l2id
 *
 * @param [in] l2id unique L2 cache identifier
 * @param [in] max_num_ca maximum number of classes of service
 *             that can be accommodated at \a ca
 * @param [out] num_ca number of classes of service read into \a ca
 * @param [out] ca table with read classes of service
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_l2ca_get(const unsigned l2id,
                           const unsigned max_num_ca,
                           unsigned *num_ca,
                           struct pqos_l2ca *ca);

/**
 * @brief Check minimum cbm bits accepted by OS interface for L2 CAT
 *
 * @param [out] min_cbm_bits minimum number of bits that must be set
 *
 * @return Operational status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_l2ca_get_min_cbm_bits(unsigned *min_cbm_bits);

/**
 * @brief OS interface to set classes of service
 *        defined by \a mba_id
 *
 * @param [in]  mba_id MBA resource id
 * @param [in]  num_cos number of classes of service at \a ca
 * @param [in]  requested table with class of service definitions
 * @param [out] actual table with class of service definitions
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_mba_set(const unsigned mba_id,
                          const unsigned num_cos,
                          const struct pqos_mba *requested,
                          struct pqos_mba *actual);

/**
 * @brief OS interface to set classes of service defined by \a mba_id
 * @note: This function is specific to AMD
 *
 * @param [in]  mba_id MBA resource id
 * @param [in]  num_cos number of classes of service at \a ca
 * @param [in]  requested table with class of service definitions
 * @param [out] actual table with class of service definitions
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_mba_set_amd(const unsigned mba_id,
                              const unsigned num_cos,
                              const struct pqos_mba *requested,
                              struct pqos_mba *actual);

/**
 * @brief OS interface to read MBA from \a mba_id
 *
 * @param [in]  mba_id MBA resource id
 * @param [in]  max_num_cos maximum number of classes of service
 *              that can be accommodated at \a mba_tab
 * @param [out] num_cos number of classes of service read into \a mba_tab
 * @param [out] mba_tab table with read classes of service
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_mba_get(const unsigned mba_id,
                          const unsigned max_num_cos,
                          unsigned *num_cos,
                          struct pqos_mba *mba_tab);

/**
 * @brief OS interface to read MBA from \a mba_id
 * @note: This function is specific to AMD
 *
 * @param [in]  mba_id MBA resource id
 * @param [in]  max_num_cos maximum number of classes of service
 *              that can be accommodated at \a mba_tab
 * @param [out] num_cos number of classes of service read into \a mba_tab
 * @param [out] mba_tab table with read classes of service
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_mba_get_amd(const unsigned mba_id,
                              const unsigned max_num_cos,
                              unsigned *num_cos,
                              struct pqos_mba *mba_tab);

/**
 * @brief OS interface to read MBA from \a mba_id
 * @NOTE: This function is specific to AMD
 *
 * @param [in]  mba_id MBA resource id
 * @param [in]  max_num_cos maximum number of classes of service
 *              that can be accommodated at \a mba_tab
 * @param [out] num_cos number of classes of service read into \a mba_tab
 * @param [out] mba_tab table with read classes of service
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_smba_get_amd(const unsigned mba_id,
                               const unsigned max_num_cos,
                               unsigned *num_cos,
                               struct pqos_mba *smba_tab);

/**
 * @brief OS interface to set classes of service defined by \a smba_id
 * @NOTE: This function is specific to AMD
 *
 * @param [in]  smba_id MBA resource id
 * @param [in]  num_cos number of classes of service at \a ca
 * @param [in]  requested table with class of service definitions
 * @param [out] actual table with class of service definitions
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_smba_set_amd(const unsigned smba_id,
                               const unsigned num_cos,
                               const struct pqos_mba *requested,
                               struct pqos_mba *actual);

/**
 * @brief OS interface to associate \a lcore
 *        with given class of service
 *
 * @param [in] lcore CPU logical core id
 * @param [in] class_id class of service
 *
 * @return Operations status
 */
PQOS_LOCAL int os_alloc_assoc_set(const unsigned lcore,
                                  const unsigned class_id);

/**
 * @brief OS interface to read association
 *        of \a lcore with class of service
 *
 * @param [in] lcore CPU logical core id
 * @param [out] class_id class of service
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_alloc_assoc_get(const unsigned lcore, unsigned *class_id);

/**
 * @brief Retrieves task id's from resctrl task file for a given COS
 *
 * @param [in] class_id Class of Service ID
 * @param [out] count place to store actual number of task id's returned
 *
 * @return Allocated task id array
 * @retval NULL on error
 */
PQOS_LOCAL unsigned *os_pid_get_pid_assoc(const unsigned class_id,
                                          unsigned *count);

/**
 * @brief OS interface to associate \a task
 *        with given class of service
 *
 * @param [in] task task id to be associated
 * @param [in] class_id class of service
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_alloc_assoc_set_pid(const pid_t task,
                                      const unsigned class_id);

/**
 * @brief OS interface to read association
 *        of \a task with class of service
 *
 * @param [in] task task id to find association
 * @param [out] class_id class of service
 *
 * @return Operations status
 * @retval PQOS_RETVAL_OK on success
 */
PQOS_LOCAL int os_alloc_assoc_get_pid(const pid_t task, unsigned *class_id);

#ifdef __cplusplus
}
#endif

#endif /* __PQOS_OS_ALLOC_H__ */