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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2018, Matthew Macy <mmacy@freebsd.org>
*
* 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>
struct epoch_context {
void *data[2];
} __aligned(sizeof(void *));
typedef struct epoch_context *epoch_context_t;
typedef void epoch_callback_t(epoch_context_t);
#ifdef _KERNEL
#include <sys/lock.h>
#include <sys/pcpu.h>
#include <ck_epoch.h>
struct epoch;
typedef struct epoch *epoch_t;
#define EPOCH_PREEMPT 0x1
#define EPOCH_LOCKED 0x2
extern epoch_t global_epoch;
extern epoch_t global_epoch_preempt;
struct epoch_tracker {
TAILQ_ENTRY(epoch_tracker) et_link;
struct thread *et_td;
ck_epoch_section_t et_section;
uint8_t et_old_priority;
#ifdef EPOCH_TRACE
struct epoch *et_epoch;
SLIST_ENTRY(epoch_tracker) et_tlink;
const char *et_file;
int et_line;
int et_flags;
#define ET_REPORT_EXIT 0x1
#endif
} __aligned(sizeof(void *));
typedef struct epoch_tracker *epoch_tracker_t;
epoch_t epoch_alloc(const char *name, int flags);
void epoch_free(epoch_t epoch);
void epoch_wait(epoch_t epoch);
void epoch_wait_preempt(epoch_t epoch);
void epoch_drain_callbacks(epoch_t epoch);
void epoch_call(epoch_t epoch, epoch_callback_t cb, epoch_context_t ctx);
int in_epoch(epoch_t epoch);
int in_epoch_verbose(epoch_t epoch, int dump_onfail);
DPCPU_DECLARE(int, epoch_cb_count);
DPCPU_DECLARE(struct grouptask, epoch_cb_task);
#ifdef EPOCH_TRACE
#define EPOCH_FILE_LINE , const char *file, int line
#else
#define EPOCH_FILE_LINE
#endif
void _epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE);
void _epoch_exit_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE);
#ifdef EPOCH_TRACE
void epoch_trace_list(struct thread *);
void epoch_where_report(epoch_t);
#define epoch_enter_preempt(epoch, et) _epoch_enter_preempt(epoch, et, __FILE__, __LINE__)
#define epoch_exit_preempt(epoch, et) _epoch_exit_preempt(epoch, et, __FILE__, __LINE__)
#else
#define epoch_enter_preempt(epoch, et) _epoch_enter_preempt(epoch, et)
#define epoch_exit_preempt(epoch, et) _epoch_exit_preempt(epoch, et)
#endif
void epoch_enter(epoch_t epoch);
void epoch_exit(epoch_t epoch);
/*
* Globally recognized epochs in the FreeBSD kernel.
*/
/* Network preemptible epoch, declared in sys/net/if.c. */
extern epoch_t net_epoch_preempt;
#define NET_EPOCH_ENTER(et) epoch_enter_preempt(net_epoch_preempt, &(et))
#define NET_EPOCH_EXIT(et) epoch_exit_preempt(net_epoch_preempt, &(et))
#define NET_EPOCH_WAIT() epoch_wait_preempt(net_epoch_preempt)
#define NET_EPOCH_CALL(f, c) epoch_call(net_epoch_preempt, (f), (c))
#define NET_EPOCH_ASSERT() MPASS(in_epoch(net_epoch_preempt))
#define NET_TASK_INIT(t, p, f, c) TASK_INIT_FLAGS(t, p, f, c, TASK_NETWORK)
#define NET_GROUPTASK_INIT(gtask, prio, func, ctx) \
GTASK_INIT(&(gtask)->gt_task, TASK_NETWORK, (prio), (func), (ctx))
#endif /* _KERNEL */
#endif /* _SYS_EPOCH_H_ */
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