event_machine_core.c

/*
 *   Copyright (c) 2015-2023, Nokia Solutions and Networks
 *   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 the copyright holder 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.
 */
 
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include <stdint.h>
 
#include <odp_api.h>
 
#include <event_machine.h>
 
#include "em_core.h"
#include "em_core_types.h"
#include "em_error.h"
#include "em_mem.h"
 
/* Per core (thread) state of em_core_id_first/next() */
static ENV_LOCAL struct {
        int idx;
        em_core_mask_t *src_core_mask;
} _core_id_iter = {.idx = -1, .src_core_mask = NULL};
 
int em_core_id(void)
{
        return em_locm.core_id;
}
 
uint32_t em_core_count(void)
{
        return odp_atomic_load_u32(&em_shm->core_map.current_core_count);
}
 
uint32_t em_core_count_max(void)
{
        return em_shm->conf.core_count;
}
 
uint32_t em_core_type_count(em_core_type_t core_type)
{
        core_map_t *const core_map = &em_shm->core_map;
        int count;
 
        switch (core_type) {
        case EM_CORE_TYPE_WORKER:
                count = odp_atomic_load_u32(&core_map->worker_core_count);
                break;
        case EM_CORE_TYPE_CONTROL:
                count = odp_atomic_load_u32(&core_map->control_core_count);
                break;
        case EM_CORE_TYPE_EXTERNAL:
                count = odp_atomic_load_u32(&core_map->external_thread_count);
                break;
        case EM_CORE_TYPE_UNDEF:
                count = odp_atomic_load_u32(&core_map->current_core_count);
                break;
        default:
                count = 0;
                break;
        }
 
        return count;
}
 
int em_core_id_first(em_core_type_t core_type, uint32_t *num /*out*/)
{
        core_map_t *const core_map = &em_shm->core_map;
        uint32_t current_core_count;
        odp_atomic_u32_t *src_core_count;
        em_core_mask_t *src_core_mask;
        em_core_mask_t dst_core_mask;
 
        if (unlikely(!(core_type == EM_CORE_TYPE_UNDEF ||
                       core_type == EM_CORE_TYPE_CONTROL ||
                       core_type == EM_CORE_TYPE_WORKER))) {
                _core_id_iter.idx =  -1;
                if (num)
                        *num = 0;
                return -1;
        }
 
        if (core_type == EM_CORE_TYPE_WORKER) {
                src_core_count = &core_map->worker_core_count;
                src_core_mask = &core_map->rwlocked.worker_mask;
        } else if (core_type == EM_CORE_TYPE_CONTROL) {
                src_core_count = &core_map->control_core_count;
                src_core_mask = &core_map->rwlocked.control_mask;
        } else {
                src_core_count = &core_map->current_core_count;
                src_core_mask = &core_map->rwlocked.logic_mask;
        }
 
        odp_rwlock_read_lock(&core_map->rwlock);
        current_core_count = odp_atomic_load_u32(src_core_count);
        em_core_mask_copy(&dst_core_mask, src_core_mask);
        odp_rwlock_read_unlock(&core_map->rwlock);
 
        if (num)
                *num = current_core_count;
 
        if (current_core_count == 0) {
                _core_id_iter.idx = -1;
                return -1;
        }
 
        _core_id_iter.idx = em_core_mask_first(&dst_core_mask);
        _core_id_iter.src_core_mask = src_core_mask;
 
        return _core_id_iter.idx;
}
 
int em_core_id_next(void)
{
        core_map_t *const core_map = &em_shm->core_map;
        const em_core_mask_t *src_core_mask = _core_id_iter.src_core_mask;
        em_core_mask_t dst_core_mask;
 
        if (unlikely(_core_id_iter.idx < 0))
                return -1;
 
        odp_rwlock_read_lock(&core_map->rwlock);
        em_core_mask_copy(&dst_core_mask, src_core_mask);
        odp_rwlock_read_unlock(&core_map->rwlock);
 
        _core_id_iter.idx = em_core_mask_next(&dst_core_mask, _core_id_iter.idx);
        if (unlikely(_core_id_iter.idx < 0)) {
                _core_id_iter.idx = -1;
                return -1;
        }
 
        return _core_id_iter.idx;
}
 
uint32_t em_core_ids_available(em_core_type_t core_type,
                               em_core_mask_t *core_mask /*out*/)
{
        core_map_t *const core_map = &em_shm->core_map;
        uint32_t current_core_count;
        odp_atomic_u32_t *src_core_count;
        const em_core_mask_t *src_core_mask;
 
        if (unlikely(!core_mask ||
                     !(core_type == EM_CORE_TYPE_UNDEF ||
                       core_type == EM_CORE_TYPE_CONTROL ||
                       core_type == EM_CORE_TYPE_WORKER))) {
                if (core_mask)
                        em_core_mask_zero(core_mask);
                return 0;
        }
 
        if (core_type == EM_CORE_TYPE_WORKER) {
                src_core_count = &core_map->worker_core_count;
                src_core_mask = &core_map->rwlocked.worker_mask;
        } else if (core_type == EM_CORE_TYPE_CONTROL) {
                src_core_count = &core_map->control_core_count;
                src_core_mask = &core_map->rwlocked.control_mask;
        } else {
                src_core_count = &core_map->current_core_count;
                src_core_mask = &core_map->rwlocked.logic_mask;
        }
 
        odp_rwlock_read_lock(&core_map->rwlock);
        current_core_count = odp_atomic_load_u32(src_core_count);
        em_core_mask_copy(core_mask, src_core_mask);
        odp_rwlock_read_unlock(&core_map->rwlock);
 
        return current_core_count;
}
 
em_core_type_t em_core_type(void)
{
        return em_locm.conf_local.core_type;
}