xref: /f-stack/tools/compat/include/sys/epoch.h (revision d4a07e70)
1*d4a07e70Sfengbojiang /*-
2*d4a07e70Sfengbojiang  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3*d4a07e70Sfengbojiang  *
4*d4a07e70Sfengbojiang  * Copyright (c) 2018, Matthew Macy <[email protected]>
5*d4a07e70Sfengbojiang  *
6*d4a07e70Sfengbojiang  * Redistribution and use in source and binary forms, with or without
7*d4a07e70Sfengbojiang  * modification, are permitted provided that the following conditions
8*d4a07e70Sfengbojiang  * are met:
9*d4a07e70Sfengbojiang  * 1. Redistributions of source code must retain the above copyright
10*d4a07e70Sfengbojiang  *    notice, this list of conditions and the following disclaimer.
11*d4a07e70Sfengbojiang  * 2. Redistributions in binary form must reproduce the above copyright
12*d4a07e70Sfengbojiang  *    notice, this list of conditions and the following disclaimer in the
13*d4a07e70Sfengbojiang  *    documentation and/or other materials provided with the distribution.
14*d4a07e70Sfengbojiang  *
15*d4a07e70Sfengbojiang  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16*d4a07e70Sfengbojiang  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17*d4a07e70Sfengbojiang  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18*d4a07e70Sfengbojiang  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19*d4a07e70Sfengbojiang  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20*d4a07e70Sfengbojiang  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21*d4a07e70Sfengbojiang  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22*d4a07e70Sfengbojiang  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23*d4a07e70Sfengbojiang  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24*d4a07e70Sfengbojiang  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25*d4a07e70Sfengbojiang  * SUCH DAMAGE.
26*d4a07e70Sfengbojiang  *
27*d4a07e70Sfengbojiang  * $FreeBSD$
28*d4a07e70Sfengbojiang  */
29*d4a07e70Sfengbojiang 
30*d4a07e70Sfengbojiang #ifndef _SYS_EPOCH_H_
31*d4a07e70Sfengbojiang #define _SYS_EPOCH_H_
32*d4a07e70Sfengbojiang 
33*d4a07e70Sfengbojiang struct epoch_context {
34*d4a07e70Sfengbojiang 	void   *data[2];
35*d4a07e70Sfengbojiang } __attribute__((__aligned__(sizeof(void *))));
36*d4a07e70Sfengbojiang 
37*d4a07e70Sfengbojiang typedef struct epoch_context *epoch_context_t;
38*d4a07e70Sfengbojiang typedef	void epoch_callback_t(epoch_context_t);
39*d4a07e70Sfengbojiang 
40*d4a07e70Sfengbojiang #ifdef _KERNEL
41*d4a07e70Sfengbojiang #include <sys/lock.h>
42*d4a07e70Sfengbojiang #include <sys/pcpu.h>
43*d4a07e70Sfengbojiang #include <ck_epoch.h>
44*d4a07e70Sfengbojiang 
45*d4a07e70Sfengbojiang struct epoch;
46*d4a07e70Sfengbojiang typedef struct epoch *epoch_t;
47*d4a07e70Sfengbojiang 
48*d4a07e70Sfengbojiang #define EPOCH_PREEMPT 0x1
49*d4a07e70Sfengbojiang #define EPOCH_LOCKED 0x2
50*d4a07e70Sfengbojiang 
51*d4a07e70Sfengbojiang extern epoch_t global_epoch;
52*d4a07e70Sfengbojiang extern epoch_t global_epoch_preempt;
53*d4a07e70Sfengbojiang 
54*d4a07e70Sfengbojiang struct epoch_tracker {
55*d4a07e70Sfengbojiang 	TAILQ_ENTRY(epoch_tracker) et_link;
56*d4a07e70Sfengbojiang 	struct thread *et_td;
57*d4a07e70Sfengbojiang 	ck_epoch_section_t et_section;
58*d4a07e70Sfengbojiang #ifdef EPOCH_TRACE
59*d4a07e70Sfengbojiang 	struct epoch *et_epoch;
60*d4a07e70Sfengbojiang 	SLIST_ENTRY(epoch_tracker) et_tlink;
61*d4a07e70Sfengbojiang 	const char *et_file;
62*d4a07e70Sfengbojiang 	int et_line;
63*d4a07e70Sfengbojiang #endif
64*d4a07e70Sfengbojiang } __attribute__((__aligned__(sizeof(void *))));
65*d4a07e70Sfengbojiang typedef struct epoch_tracker *epoch_tracker_t;
66*d4a07e70Sfengbojiang 
67*d4a07e70Sfengbojiang epoch_t	epoch_alloc(const char *name, int flags);
68*d4a07e70Sfengbojiang void	epoch_free(epoch_t epoch);
69*d4a07e70Sfengbojiang void	epoch_wait(epoch_t epoch);
70*d4a07e70Sfengbojiang void	epoch_wait_preempt(epoch_t epoch);
71*d4a07e70Sfengbojiang void	epoch_drain_callbacks(epoch_t epoch);
72*d4a07e70Sfengbojiang void	epoch_call(epoch_t epoch, epoch_callback_t cb, epoch_context_t ctx);
73*d4a07e70Sfengbojiang int	in_epoch(epoch_t epoch);
74*d4a07e70Sfengbojiang int in_epoch_verbose(epoch_t epoch, int dump_onfail);
75*d4a07e70Sfengbojiang DPCPU_DECLARE(int, epoch_cb_count);
76*d4a07e70Sfengbojiang DPCPU_DECLARE(struct grouptask, epoch_cb_task);
77*d4a07e70Sfengbojiang 
78*d4a07e70Sfengbojiang #ifdef EPOCH_TRACE
79*d4a07e70Sfengbojiang #define	EPOCH_FILE_LINE	, const char *file, int line
80*d4a07e70Sfengbojiang #else
81*d4a07e70Sfengbojiang #define	EPOCH_FILE_LINE
82*d4a07e70Sfengbojiang #endif
83*d4a07e70Sfengbojiang 
84*d4a07e70Sfengbojiang void _epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE);
85*d4a07e70Sfengbojiang void _epoch_exit_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE);
86*d4a07e70Sfengbojiang #ifdef EPOCH_TRACE
87*d4a07e70Sfengbojiang void epoch_trace_list(struct thread *);
88*d4a07e70Sfengbojiang #define	epoch_enter_preempt(epoch, et)	_epoch_enter_preempt(epoch, et, __FILE__, __LINE__)
89*d4a07e70Sfengbojiang #define	epoch_exit_preempt(epoch, et)	_epoch_exit_preempt(epoch, et, __FILE__, __LINE__)
90*d4a07e70Sfengbojiang #else
91*d4a07e70Sfengbojiang #define epoch_enter_preempt(epoch, et)	_epoch_enter_preempt(epoch, et)
92*d4a07e70Sfengbojiang #define	epoch_exit_preempt(epoch, et)	_epoch_exit_preempt(epoch, et)
93*d4a07e70Sfengbojiang #endif
94*d4a07e70Sfengbojiang void epoch_enter(epoch_t epoch);
95*d4a07e70Sfengbojiang void epoch_exit(epoch_t epoch);
96*d4a07e70Sfengbojiang 
97*d4a07e70Sfengbojiang /*
98*d4a07e70Sfengbojiang  * Globally recognized epochs in the FreeBSD kernel.
99*d4a07e70Sfengbojiang  */
100*d4a07e70Sfengbojiang /* Network preemptible epoch, declared in sys/net/if.c. */
101*d4a07e70Sfengbojiang extern epoch_t net_epoch_preempt;
102*d4a07e70Sfengbojiang #define	NET_EPOCH_ENTER(et)	epoch_enter_preempt(net_epoch_preempt, &(et))
103*d4a07e70Sfengbojiang #define	NET_EPOCH_EXIT(et)	epoch_exit_preempt(net_epoch_preempt, &(et))
104*d4a07e70Sfengbojiang #define	NET_EPOCH_WAIT()	epoch_wait_preempt(net_epoch_preempt)
105*d4a07e70Sfengbojiang #define	NET_EPOCH_CALL(f, c)	epoch_call(net_epoch_preempt, (f), (c))
106*d4a07e70Sfengbojiang #define	NET_EPOCH_ASSERT()	MPASS(in_epoch(net_epoch_preempt))
107*d4a07e70Sfengbojiang #define	NET_TASK_INIT(t, p, f, c) TASK_INIT_FLAGS(t, p, f, c, TASK_NETWORK)
108*d4a07e70Sfengbojiang #define	NET_GROUPTASK_INIT(gtask, prio, func, ctx)			\
109*d4a07e70Sfengbojiang 	    GTASK_INIT(&(gtask)->gt_task, TASK_NETWORK, (prio), (func), (ctx))
110*d4a07e70Sfengbojiang 
111*d4a07e70Sfengbojiang #endif	/* _KERNEL */
112*d4a07e70Sfengbojiang #endif	/* _SYS_EPOCH_H_ */
113