120 lines
4.2 KiB
C
120 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2018, Matthew Macy <mmacy@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_EPOCH_H_
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#define _SYS_EPOCH_H_
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#include <sys/cdefs.h>
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struct epoch_context {
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void *data[2];
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} __aligned(sizeof(void *));
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typedef struct epoch_context *epoch_context_t;
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typedef void epoch_callback_t(epoch_context_t);
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#ifdef _KERNEL
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#include <sys/lock.h>
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#include <sys/pcpu.h>
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#include <ck_epoch.h>
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struct epoch;
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typedef struct epoch *epoch_t;
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#define EPOCH_PREEMPT 0x1
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#define EPOCH_LOCKED 0x2
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extern epoch_t global_epoch;
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extern epoch_t global_epoch_preempt;
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struct epoch_tracker {
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TAILQ_ENTRY(epoch_tracker) et_link;
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struct thread *et_td;
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ck_epoch_section_t et_section;
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uint8_t et_old_priority;
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#ifdef EPOCH_TRACE
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struct epoch *et_epoch;
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SLIST_ENTRY(epoch_tracker) et_tlink;
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const char *et_file;
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int et_line;
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int et_flags;
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#define ET_REPORT_EXIT 0x1
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#endif
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} __aligned(sizeof(void *));
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typedef struct epoch_tracker *epoch_tracker_t;
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epoch_t epoch_alloc(const char *name, int flags);
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void epoch_free(epoch_t epoch);
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void epoch_wait(epoch_t epoch);
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void epoch_wait_preempt(epoch_t epoch);
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void epoch_drain_callbacks(epoch_t epoch);
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void epoch_call(epoch_t epoch, epoch_callback_t cb, epoch_context_t ctx);
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int in_epoch(epoch_t epoch);
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int in_epoch_verbose(epoch_t epoch, int dump_onfail);
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DPCPU_DECLARE(int, epoch_cb_count);
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DPCPU_DECLARE(struct grouptask, epoch_cb_task);
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#ifdef EPOCH_TRACE
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#define EPOCH_FILE_LINE , const char *file, int line
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#else
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#define EPOCH_FILE_LINE
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#endif
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void _epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE);
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void _epoch_exit_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE);
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#ifdef EPOCH_TRACE
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void epoch_trace_list(struct thread *);
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void epoch_where_report(epoch_t);
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#define epoch_enter_preempt(epoch, et) _epoch_enter_preempt(epoch, et, __FILE__, __LINE__)
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#define epoch_exit_preempt(epoch, et) _epoch_exit_preempt(epoch, et, __FILE__, __LINE__)
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#else
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#define epoch_enter_preempt(epoch, et) _epoch_enter_preempt(epoch, et)
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#define epoch_exit_preempt(epoch, et) _epoch_exit_preempt(epoch, et)
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#endif
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void epoch_enter(epoch_t epoch);
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void epoch_exit(epoch_t epoch);
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/*
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* Globally recognized epochs in the FreeBSD kernel.
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*/
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/* Network preemptible epoch, declared in sys/net/if.c. */
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extern epoch_t net_epoch_preempt;
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#define NET_EPOCH_ENTER(et) epoch_enter_preempt(net_epoch_preempt, &(et))
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#define NET_EPOCH_EXIT(et) epoch_exit_preempt(net_epoch_preempt, &(et))
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#define NET_EPOCH_WAIT() epoch_wait_preempt(net_epoch_preempt)
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#define NET_EPOCH_CALL(f, c) epoch_call(net_epoch_preempt, (f), (c))
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#define NET_EPOCH_DRAIN_CALLBACKS() epoch_drain_callbacks(net_epoch_preempt)
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#define NET_EPOCH_ASSERT() MPASS(in_epoch(net_epoch_preempt))
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#define NET_TASK_INIT(t, p, f, c) TASK_INIT_FLAGS(t, p, f, c, TASK_NETWORK)
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#define NET_GROUPTASK_INIT(gtask, prio, func, ctx) \
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GTASK_INIT(&(gtask)->gt_task, TASK_NETWORK, (prio), (func), (ctx))
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#endif /* _KERNEL */
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#endif /* _SYS_EPOCH_H_ */
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