2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1999 Michael Smith <msmith@freebsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #ifndef _SYS_EVENTHANDLER_H_
32 #define _SYS_EVENTHANDLER_H_
34 #include <sys/_eventhandler.h>
37 #include <sys/mutex.h>
38 #include <sys/queue.h>
41 struct eventhandler_entry_vimage {
42 void (* func)(void); /* Original function registered. */
43 void *ee_arg; /* Original argument registered. */
48 struct eventhandler_list {
50 int el_flags; /* Unused. */
53 TAILQ_ENTRY(eventhandler_list) el_link;
54 TAILQ_HEAD(,eventhandler_entry) el_entries;
57 #define EHL_LOCK(p) mtx_lock(&(p)->el_lock)
58 #define EHL_UNLOCK(p) mtx_unlock(&(p)->el_lock)
59 #define EHL_LOCK_ASSERT(p, x) mtx_assert(&(p)->el_lock, x)
62 * Macro to invoke the handlers for a given event.
64 #define _EVENTHANDLER_INVOKE(name, list, ...) do { \
65 struct eventhandler_entry *_ep; \
66 struct eventhandler_entry_ ## name *_t; \
68 EHL_LOCK_ASSERT((list), MA_OWNED); \
69 (list)->el_runcount++; \
70 KASSERT((list)->el_runcount > 0, \
71 ("eventhandler_invoke: runcount overflow")); \
72 CTR0(KTR_EVH, "eventhandler_invoke(\"" __STRING(name) "\")"); \
73 TAILQ_FOREACH(_ep, &((list)->el_entries), ee_link) { \
74 if (_ep->ee_priority != EHE_DEAD_PRIORITY) { \
76 _t = (struct eventhandler_entry_ ## name *)_ep; \
77 CTR1(KTR_EVH, "eventhandler_invoke: executing %p", \
78 (void *)_t->eh_func); \
79 _t->eh_func(_ep->ee_arg , ## __VA_ARGS__); \
83 KASSERT((list)->el_runcount > 0, \
84 ("eventhandler_invoke: runcount underflow")); \
85 (list)->el_runcount--; \
86 if ((list)->el_runcount == 0) \
87 eventhandler_prune_list(list); \
92 * You can optionally use the EVENTHANDLER_LIST and EVENTHANDLER_DIRECT macros
93 * to pre-define a symbol for the eventhandler list. This symbol can be used by
94 * EVENTHANDLER_DIRECT_INVOKE, which has the advantage of not needing to do a
95 * locked search of the global list of eventhandler lists. At least
96 * EVENTHANDLER_LIST_DEFINE must be be used for EVENTHANDLER_DIRECT_INVOKE to
97 * work. EVENTHANDLER_LIST_DECLARE is only needed if the call to
98 * EVENTHANDLER_DIRECT_INVOKE is in a different compilation unit from
99 * EVENTHANDLER_LIST_DEFINE. If the events are even relatively high frequency
100 * it is suggested that you directly define a list for them.
102 #define EVENTHANDLER_LIST_DEFINE(name) \
103 struct eventhandler_list *_eventhandler_list_ ## name ; \
104 static void _ehl_init_ ## name (void * ctx __unused) \
106 _eventhandler_list_ ## name = eventhandler_create_list(#name); \
108 SYSINIT(name ## _ehl_init, SI_SUB_EVENTHANDLER, SI_ORDER_ANY, \
109 _ehl_init_ ## name, NULL); \
112 #define EVENTHANDLER_DIRECT_INVOKE(name, ...) do { \
113 struct eventhandler_list *_el; \
115 _el = _eventhandler_list_ ## name ; \
116 if (!TAILQ_EMPTY(&_el->el_entries)) { \
118 _EVENTHANDLER_INVOKE(name, _el , ## __VA_ARGS__); \
122 #define EVENTHANDLER_DEFINE(name, func, arg, priority) \
123 static eventhandler_tag name ## _tag; \
124 static void name ## _evh_init(void *ctx) \
126 name ## _tag = EVENTHANDLER_REGISTER(name, func, ctx, \
129 SYSINIT(name ## _evh_init, SI_SUB_CONFIGURE, SI_ORDER_ANY, \
130 name ## _evh_init, arg); \
133 #define EVENTHANDLER_INVOKE(name, ...) \
135 struct eventhandler_list *_el; \
137 if ((_el = eventhandler_find_list(#name)) != NULL) \
138 _EVENTHANDLER_INVOKE(name, _el , ## __VA_ARGS__); \
141 #define EVENTHANDLER_REGISTER(name, func, arg, priority) \
142 eventhandler_register(NULL, #name, func, arg, priority)
144 #define EVENTHANDLER_DEREGISTER(name, tag) \
146 struct eventhandler_list *_el; \
148 if ((_el = eventhandler_find_list(#name)) != NULL) \
149 eventhandler_deregister(_el, tag); \
152 #define EVENTHANDLER_DEREGISTER_NOWAIT(name, tag) \
154 struct eventhandler_list *_el; \
156 if ((_el = eventhandler_find_list(#name)) != NULL) \
157 eventhandler_deregister_nowait(_el, tag); \
160 eventhandler_tag eventhandler_register(struct eventhandler_list *list,
161 const char *name, void *func, void *arg, int priority);
162 void eventhandler_deregister(struct eventhandler_list *list,
163 eventhandler_tag tag);
164 void eventhandler_deregister_nowait(struct eventhandler_list *list,
165 eventhandler_tag tag);
166 struct eventhandler_list *eventhandler_find_list(const char *name);
167 void eventhandler_prune_list(struct eventhandler_list *list);
168 struct eventhandler_list *eventhandler_create_list(const char *name);
171 typedef void (*vimage_iterator_func_t)(void *, ...);
173 eventhandler_tag vimage_eventhandler_register(struct eventhandler_list *list,
174 const char *name, void *func, void *arg, int priority,
175 vimage_iterator_func_t);
179 * Standard system event queues.
182 /* Generic priority levels */
183 #define EVENTHANDLER_PRI_FIRST 0
184 #define EVENTHANDLER_PRI_ANY 10000
185 #define EVENTHANDLER_PRI_LAST 20000
187 /* Shutdown events */
188 typedef void (*shutdown_fn)(void *, int);
190 #define SHUTDOWN_PRI_FIRST EVENTHANDLER_PRI_FIRST
191 #define SHUTDOWN_PRI_DEFAULT EVENTHANDLER_PRI_ANY
192 #define SHUTDOWN_PRI_LAST EVENTHANDLER_PRI_LAST
194 EVENTHANDLER_DECLARE(shutdown_pre_sync, shutdown_fn); /* before fs sync */
195 EVENTHANDLER_DECLARE(shutdown_post_sync, shutdown_fn); /* after fs sync */
196 EVENTHANDLER_DECLARE(shutdown_final, shutdown_fn);
198 /* Power state change events */
199 typedef void (*power_change_fn)(void *);
200 EVENTHANDLER_DECLARE(power_resume, power_change_fn);
201 EVENTHANDLER_DECLARE(power_suspend, power_change_fn);
202 EVENTHANDLER_DECLARE(power_suspend_early, power_change_fn);
204 /* Low memory event */
205 typedef void (*vm_lowmem_handler_t)(void *, int);
206 #define LOWMEM_PRI_DEFAULT EVENTHANDLER_PRI_FIRST
207 EVENTHANDLER_DECLARE(vm_lowmem, vm_lowmem_handler_t);
209 /* Root mounted event */
210 typedef void (*mountroot_handler_t)(void *);
211 EVENTHANDLER_DECLARE(mountroot, mountroot_handler_t);
213 /* File system mount events */
217 typedef void (*vfs_mounted_notify_fn)(void *, struct mount *, struct vnode *,
219 typedef void (*vfs_unmounted_notify_fn)(void *, struct mount *,
221 EVENTHANDLER_DECLARE(vfs_mounted, vfs_mounted_notify_fn);
222 EVENTHANDLER_DECLARE(vfs_unmounted, vfs_unmounted_notify_fn);
226 * process_fork and exit handlers are called without Giant.
227 * exec handlers are called with Giant, but that is by accident.
232 typedef void (*exitlist_fn)(void *, struct proc *);
233 typedef void (*forklist_fn)(void *, struct proc *, struct proc *, int);
234 typedef void (*execlist_fn)(void *, struct proc *, struct image_params *);
235 typedef void (*proc_ctor_fn)(void *, struct proc *);
236 typedef void (*proc_dtor_fn)(void *, struct proc *);
237 typedef void (*proc_init_fn)(void *, struct proc *);
238 typedef void (*proc_fini_fn)(void *, struct proc *);
239 EVENTHANDLER_DECLARE(process_ctor, proc_ctor_fn);
240 EVENTHANDLER_DECLARE(process_dtor, proc_dtor_fn);
241 EVENTHANDLER_DECLARE(process_init, proc_init_fn);
242 EVENTHANDLER_DECLARE(process_fini, proc_fini_fn);
243 EVENTHANDLER_DECLARE(process_exit, exitlist_fn);
244 EVENTHANDLER_DECLARE(process_fork, forklist_fn);
245 EVENTHANDLER_DECLARE(process_exec, execlist_fn);
248 * application dump event
250 typedef void (*app_coredump_start_fn)(void *, struct thread *, char *name);
251 typedef void (*app_coredump_progress_fn)(void *, struct thread *td, int byte_count);
252 typedef void (*app_coredump_finish_fn)(void *, struct thread *td);
253 typedef void (*app_coredump_error_fn)(void *, struct thread *td, char *msg, ...);
255 EVENTHANDLER_DECLARE(app_coredump_start, app_coredump_start_fn);
256 EVENTHANDLER_DECLARE(app_coredump_progress, app_coredump_progress_fn);
257 EVENTHANDLER_DECLARE(app_coredump_finish, app_coredump_finish_fn);
258 EVENTHANDLER_DECLARE(app_coredump_error, app_coredump_error_fn);
260 typedef void (*thread_ctor_fn)(void *, struct thread *);
261 typedef void (*thread_dtor_fn)(void *, struct thread *);
262 typedef void (*thread_fini_fn)(void *, struct thread *);
263 typedef void (*thread_init_fn)(void *, struct thread *);
264 EVENTHANDLER_DECLARE(thread_ctor, thread_ctor_fn);
265 EVENTHANDLER_DECLARE(thread_dtor, thread_dtor_fn);
266 EVENTHANDLER_DECLARE(thread_init, thread_init_fn);
267 EVENTHANDLER_DECLARE(thread_fini, thread_fini_fn);
269 typedef void (*uma_zone_chfn)(void *);
270 EVENTHANDLER_DECLARE(nmbclusters_change, uma_zone_chfn);
271 EVENTHANDLER_DECLARE(nmbufs_change, uma_zone_chfn);
272 EVENTHANDLER_DECLARE(maxsockets_change, uma_zone_chfn);
274 /* Kernel linker file load and unload events */
276 typedef void (*kld_load_fn)(void *, struct linker_file *);
277 typedef void (*kld_unload_fn)(void *, const char *, caddr_t, size_t);
278 typedef void (*kld_unload_try_fn)(void *, struct linker_file *, int *);
279 EVENTHANDLER_DECLARE(kld_load, kld_load_fn);
280 EVENTHANDLER_DECLARE(kld_unload, kld_unload_fn);
281 EVENTHANDLER_DECLARE(kld_unload_try, kld_unload_try_fn);
283 /* Generic graphics framebuffer interface */
285 typedef void (*register_framebuffer_fn)(void *, struct fb_info *);
286 typedef void (*unregister_framebuffer_fn)(void *, struct fb_info *);
287 EVENTHANDLER_DECLARE(register_framebuffer, register_framebuffer_fn);
288 EVENTHANDLER_DECLARE(unregister_framebuffer, unregister_framebuffer_fn);
290 /* Veto ada attachment */
293 typedef void (*ada_probe_veto_fn)(void *, struct cam_path *,
294 struct ata_params *, int *);
295 EVENTHANDLER_DECLARE(ada_probe_veto, ada_probe_veto_fn);
297 /* Swap device events */
299 typedef void (*swapon_fn)(void *, struct swdevt *);
300 typedef void (*swapoff_fn)(void *, struct swdevt *);
301 EVENTHANDLER_DECLARE(swapon, swapon_fn);
302 EVENTHANDLER_DECLARE(swapoff, swapoff_fn);
304 /* newbus device events */
306 EVHDEV_DETACH_BEGIN, /* Before detach() is called */
307 EVHDEV_DETACH_COMPLETE, /* After detach() returns 0 */
308 EVHDEV_DETACH_FAILED /* After detach() returns err */
310 typedef void (*device_attach_fn)(void *, device_t);
311 typedef void (*device_detach_fn)(void *, device_t, enum evhdev_detach);
312 EVENTHANDLER_DECLARE(device_attach, device_attach_fn);
313 EVENTHANDLER_DECLARE(device_detach, device_detach_fn);
315 #endif /* _SYS_EVENTHANDLER_H_ */