1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 28 #ifndef _SYS_EPOCH_H_ 29 #define _SYS_EPOCH_H_ 30 31 #include <sys/cdefs.h> 32 33 struct epoch_context { 34 void *data[2]; 35 } __aligned(sizeof(void *)); 36 37 typedef struct epoch_context *epoch_context_t; 38 typedef void epoch_callback_t(epoch_context_t); 39 40 #ifdef _KERNEL 41 #include <sys/lock.h> 42 #include <sys/pcpu.h> 43 #include <ck_epoch.h> 44 45 struct epoch; 46 typedef struct epoch *epoch_t; 47 48 #define EPOCH_PREEMPT 0x1 49 #define EPOCH_LOCKED 0x2 50 51 extern epoch_t global_epoch; 52 extern epoch_t global_epoch_preempt; 53 54 struct epoch_tracker { 55 TAILQ_ENTRY(epoch_tracker) et_link; 56 struct thread *et_td; 57 ck_epoch_section_t et_section; 58 uint8_t et_old_priority; 59 #ifdef EPOCH_TRACE 60 struct epoch *et_epoch; 61 SLIST_ENTRY(epoch_tracker) et_tlink; 62 const char *et_file; 63 int et_line; 64 int et_flags; 65 #define ET_REPORT_EXIT 0x1 66 #endif 67 } __aligned(sizeof(void *)); 68 typedef struct epoch_tracker *epoch_tracker_t; 69 70 epoch_t epoch_alloc(const char *name, int flags); 71 void epoch_free(epoch_t epoch); 72 void epoch_wait(epoch_t epoch); 73 void epoch_wait_preempt(epoch_t epoch); 74 void epoch_drain_callbacks(epoch_t epoch); 75 void epoch_call(epoch_t epoch, epoch_callback_t cb, epoch_context_t ctx); 76 int in_epoch(epoch_t epoch); 77 int in_epoch_verbose(epoch_t epoch, int dump_onfail); 78 DPCPU_DECLARE(int, epoch_cb_count); 79 DPCPU_DECLARE(struct grouptask, epoch_cb_task); 80 81 #ifdef EPOCH_TRACE 82 #define EPOCH_FILE_LINE , const char *file, int line 83 #else 84 #define EPOCH_FILE_LINE 85 #endif 86 87 void _epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE); 88 void _epoch_exit_preempt(epoch_t epoch, epoch_tracker_t et EPOCH_FILE_LINE); 89 #ifdef EPOCH_TRACE 90 void epoch_trace_list(struct thread *); 91 void epoch_where_report(epoch_t); 92 #define epoch_enter_preempt(epoch, et) _epoch_enter_preempt(epoch, et, __FILE__, __LINE__) 93 #define epoch_exit_preempt(epoch, et) _epoch_exit_preempt(epoch, et, __FILE__, __LINE__) 94 #else 95 #define epoch_enter_preempt(epoch, et) _epoch_enter_preempt(epoch, et) 96 #define epoch_exit_preempt(epoch, et) _epoch_exit_preempt(epoch, et) 97 #endif 98 void epoch_enter(epoch_t epoch); 99 void epoch_exit(epoch_t epoch); 100 101 /* 102 * Globally recognized epochs in the FreeBSD kernel. 103 */ 104 /* Network preemptible epoch, declared in sys/net/if.c. */ 105 extern epoch_t net_epoch_preempt; 106 #define NET_EPOCH_ENTER(et) epoch_enter_preempt(net_epoch_preempt, &(et)) 107 #define NET_EPOCH_EXIT(et) epoch_exit_preempt(net_epoch_preempt, &(et)) 108 #define NET_EPOCH_WAIT() epoch_wait_preempt(net_epoch_preempt) 109 #define NET_EPOCH_CALL(f, c) epoch_call(net_epoch_preempt, (f), (c)) 110 #define NET_EPOCH_DRAIN_CALLBACKS() epoch_drain_callbacks(net_epoch_preempt) 111 #define NET_EPOCH_ASSERT() MPASS(in_epoch(net_epoch_preempt)) 112 #define NET_TASK_INIT(t, p, f, c) TASK_INIT_FLAGS(t, p, f, c, TASK_NETWORK) 113 #define NET_GROUPTASK_INIT(gtask, prio, func, ctx) \ 114 GTASK_INIT(&(gtask)->gt_task, TASK_NETWORK, (prio), (func), (ctx)) 115 116 #endif /* _KERNEL */ 117 #endif /* _SYS_EPOCH_H_ */ 118