FreeBSD/Linux Kernel Cross Reference
sys/sys/epoch.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2018, Matthew Macy <mmacy@freebsd.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD: releng/12.0/sys/sys/epoch.h 338127 2018-08-21 03:33:54Z mmacy $
28 */
29
30 #ifndef _SYS_EPOCH_H_
31 #define _SYS_EPOCH_H_
32 #ifdef _KERNEL
33 #include <sys/lock.h>
34 #include <sys/pcpu.h>
35 #endif
36
37 struct epoch;
38 typedef struct epoch *epoch_t;
39
40 #define EPOCH_PREEMPT 0x1
41 #define EPOCH_LOCKED 0x2
42
43 extern epoch_t global_epoch;
44 extern epoch_t global_epoch_preempt;
45
46 struct epoch_context {
47 void *data[2];
48 } __aligned(sizeof(void *));
49
50 typedef struct epoch_context *epoch_context_t;
51
52
53 struct epoch_tracker {
54 void *datap[3];
55 #ifdef EPOCH_TRACKER_DEBUG
56 int datai[5];
57 #else
58 int datai[1];
59 #endif
60 } __aligned(sizeof(void *));
61
62 typedef struct epoch_tracker *epoch_tracker_t;
63
64 epoch_t epoch_alloc(int flags);
65 void epoch_free(epoch_t epoch);
66 void epoch_wait(epoch_t epoch);
67 void epoch_wait_preempt(epoch_t epoch);
68 void epoch_call(epoch_t epoch, epoch_context_t ctx, void (*callback) (epoch_context_t));
69 int in_epoch(epoch_t epoch);
70 int in_epoch_verbose(epoch_t epoch, int dump_onfail);
71 #ifdef _KERNEL
72 DPCPU_DECLARE(int, epoch_cb_count);
73 DPCPU_DECLARE(struct grouptask, epoch_cb_task);
74 #define EPOCH_MAGIC0 0xFADECAFEF00DD00D
75 #define EPOCH_MAGIC1 0xBADDBABEDEEDFEED
76
77 void epoch_enter_preempt_KBI(epoch_t epoch, epoch_tracker_t et);
78 void epoch_exit_preempt_KBI(epoch_t epoch, epoch_tracker_t et);
79 void epoch_enter_KBI(epoch_t epoch);
80 void epoch_exit_KBI(epoch_t epoch);
81
82
83 #if defined(KLD_MODULE) && !defined(KLD_TIED)
84 #define epoch_enter_preempt(e, t) epoch_enter_preempt_KBI((e), (t))
85 #define epoch_exit_preempt(e, t) epoch_exit_preempt_KBI((e), (t))
86 #define epoch_enter(e) epoch_enter_KBI((e))
87 #define epoch_exit(e) epoch_exit_KBI((e))
88 #else
89 #include <sys/epoch_private.h>
90 #endif /* KLD_MODULE */
91
92 #endif /* _KERNEL */
93 #endif
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