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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2018, Matthew Macy <mmacy@freebsd.org>
* Copyright (c) 2018, embedded brains GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef _SYS_EPOCH_H_
#define _SYS_EPOCH_H_
#include <sys/cdefs.h>
#ifdef _KERNEL
#include <sys/lock.h>
#include <sys/pcpu.h>
#include <rtems/score/percpudata.h>
#include <rtems/score/threaddispatch.h>
#endif
#include <rtems/thread.h>
#include <ck_epoch.h>
struct epoch_record;
struct epoch_tracker_mutex {
SLIST_ENTRY(epoch_tracker_mutex) etm_link; /* link to add to tracker */
rtems_mutex etm_mtx;
struct epoch_record *etm_record;
};
typedef struct epoch_tracker {
ck_epoch_section_t et_section;
TAILQ_ENTRY(epoch_tracker) et_link; /* link to add to record */
struct _Thread_Control *et_td; /* owner of this tracker */
SLIST_HEAD(, epoch_tracker_mutex) et_mtx;
} *epoch_tracker_t;
TAILQ_HEAD(epoch_tdlist, epoch_tracker);
typedef struct ck_epoch_entry *epoch_context_t;
#define epoch_context ck_epoch_entry
#ifdef _KERNEL
#define EPOCH_ALIGN CPU_CACHE_LINE_BYTES
struct epoch_record {
ck_epoch_record_t er_record;
struct epoch_tdlist er_tdlist;
uint32_t er_cpuid;
} __aligned(EPOCH_ALIGN);
typedef struct epoch {
struct ck_epoch e_epoch __aligned(EPOCH_ALIGN);
uintptr_t e_pcpu_record_offset;
int e_flags;
SLIST_ENTRY(epoch) e_link; /* List of all epochs */
} *epoch_t;
extern struct epoch _bsd_global_epoch;
#define global_epoch &_bsd_global_epoch
extern struct epoch _bsd_global_epoch_preempt;
#define global_epoch_preempt &_bsd_global_epoch_preempt
#define EPOCH_PREEMPT 0x1
#define EPOCH_LOCKED 0x2
#define EPOCH_DEFINE(name, flags) \
struct epoch name; \
static PER_CPU_DATA_ITEM(struct epoch_record, name); \
static void \
epoch_##name##_sysinit(void) \
{ \
\
_bsd_epoch_init(&name, PER_CPU_DATA_OFFSET(name), flags); \
} \
SYSINIT(epoch_##name, SI_SUB_TUNABLES, SI_ORDER_THIRD, \
epoch_##name##_sysinit, NULL)
void _bsd_epoch_init(epoch_t epoch, uintptr_t pcpu_record_offset,
int flags);
void epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et);
void epoch_exit_preempt(epoch_t epoch, epoch_tracker_t et);
void epoch_wait(epoch_t epoch);
void epoch_wait_preempt(epoch_t epoch);
void epoch_call(epoch_t epoch, epoch_context_t ctx,
void (*callback) (epoch_context_t));
int _bsd_in_epoch(epoch_t epoch);
#define in_epoch(epoch) _bsd_in_epoch(epoch)
#define in_epoch_verbose(epoch, dump_onfail) _bsd_in_epoch(epoch)
#define EPOCH_GET_RECORD(cpu_self, epoch) PER_CPU_DATA_GET_BY_OFFSET( \
cpu_self, struct epoch_record, epoch->e_pcpu_record_offset)
static __inline void
epoch_enter(epoch_t epoch)
{
Per_CPU_Control *cpu_self;
struct epoch_record *er;
cpu_self = _Thread_Dispatch_disable();
er = EPOCH_GET_RECORD(cpu_self, epoch);
ck_epoch_begin(&er->er_record, NULL);
}
static __inline void
epoch_exit(epoch_t epoch)
{
Per_CPU_Control *cpu_self;
struct epoch_record *er;
cpu_self = _Per_CPU_Get();
er = EPOCH_GET_RECORD(cpu_self, epoch);
ck_epoch_end(&er->er_record, NULL);
_Thread_Dispatch_enable(cpu_self);
}
#endif /* _KERNEL */
#endif /* _SYS_EPOCH_H_ */
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