1 1.30 riastrad /* $NetBSD: sysmon_wdog.c,v 1.30 2021/12/31 11:05:41 riastradh Exp $ */ 2 1.1 thorpej 3 1.1 thorpej /*- 4 1.1 thorpej * Copyright (c) 2000 Zembu Labs, Inc. 5 1.1 thorpej * All rights reserved. 6 1.1 thorpej * 7 1.1 thorpej * Author: Jason R. Thorpe <thorpej (at) zembu.com> 8 1.1 thorpej * 9 1.1 thorpej * Redistribution and use in source and binary forms, with or without 10 1.1 thorpej * modification, are permitted provided that the following conditions 11 1.1 thorpej * are met: 12 1.1 thorpej * 1. Redistributions of source code must retain the above copyright 13 1.1 thorpej * notice, this list of conditions and the following disclaimer. 14 1.1 thorpej * 2. Redistributions in binary form must reproduce the above copyright 15 1.1 thorpej * notice, this list of conditions and the following disclaimer in the 16 1.1 thorpej * documentation and/or other materials provided with the distribution. 17 1.1 thorpej * 3. All advertising materials mentioning features or use of this software 18 1.1 thorpej * must display the following acknowledgement: 19 1.1 thorpej * This product includes software developed by Zembu Labs, Inc. 20 1.1 thorpej * 4. Neither the name of Zembu Labs nor the names of its employees may 21 1.1 thorpej * be used to endorse or promote products derived from this software 22 1.1 thorpej * without specific prior written permission. 23 1.1 thorpej * 24 1.1 thorpej * THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS 25 1.1 thorpej * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR- 26 1.1 thorpej * RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS- 27 1.1 thorpej * CLAIMED. IN NO EVENT SHALL ZEMBU LABS BE LIABLE FOR ANY DIRECT, INDIRECT, 28 1.1 thorpej * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 1.1 thorpej * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 1.1 thorpej * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 1.1 thorpej * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 1.1 thorpej * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 1.1 thorpej * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 1.1 thorpej */ 35 1.1 thorpej 36 1.1 thorpej /* 37 1.1 thorpej * Watchdog timer framework for sysmon. Hardware (and software) 38 1.1 thorpej * watchdog timers can register themselves here to provide a 39 1.1 thorpej * watchdog function, which provides an abstract interface to the 40 1.1 thorpej * user. 41 1.1 thorpej */ 42 1.3 lukem 43 1.3 lukem #include <sys/cdefs.h> 44 1.30 riastrad __KERNEL_RCSID(0, "$NetBSD: sysmon_wdog.c,v 1.30 2021/12/31 11:05:41 riastradh Exp $"); 45 1.1 thorpej 46 1.1 thorpej #include <sys/param.h> 47 1.1 thorpej #include <sys/conf.h> 48 1.1 thorpej #include <sys/errno.h> 49 1.1 thorpej #include <sys/fcntl.h> 50 1.24 dyoung #include <sys/condvar.h> 51 1.21 xtraeme #include <sys/mutex.h> 52 1.1 thorpej #include <sys/callout.h> 53 1.1 thorpej #include <sys/kernel.h> 54 1.1 thorpej #include <sys/systm.h> 55 1.1 thorpej #include <sys/proc.h> 56 1.26 pgoyette #include <sys/module.h> 57 1.27 pgoyette #include <sys/once.h> 58 1.1 thorpej 59 1.1 thorpej #include <dev/sysmon/sysmonvar.h> 60 1.1 thorpej 61 1.20 xtraeme static LIST_HEAD(, sysmon_wdog) sysmon_wdog_list = 62 1.1 thorpej LIST_HEAD_INITIALIZER(&sysmon_wdog_list); 63 1.20 xtraeme static int sysmon_wdog_count; 64 1.20 xtraeme static kmutex_t sysmon_wdog_list_mtx, sysmon_wdog_mtx; 65 1.24 dyoung static kcondvar_t sysmon_wdog_cv; 66 1.20 xtraeme static struct sysmon_wdog *sysmon_armed_wdog; 67 1.20 xtraeme static callout_t sysmon_wdog_callout; 68 1.20 xtraeme static void *sysmon_wdog_sdhook; 69 1.25 matt static void *sysmon_wdog_cphook; 70 1.17 ad 71 1.1 thorpej struct sysmon_wdog *sysmon_wdog_find(const char *); 72 1.1 thorpej void sysmon_wdog_release(struct sysmon_wdog *); 73 1.1 thorpej int sysmon_wdog_setmode(struct sysmon_wdog *, int, u_int); 74 1.1 thorpej void sysmon_wdog_ktickle(void *); 75 1.25 matt void sysmon_wdog_critpoll(void *); 76 1.1 thorpej void sysmon_wdog_shutdown(void *); 77 1.24 dyoung void sysmon_wdog_ref(struct sysmon_wdog *); 78 1.1 thorpej 79 1.30 riastrad static struct sysmon_opvec sysmon_wdog_opvec = { 80 1.26 pgoyette sysmonopen_wdog, sysmonclose_wdog, sysmonioctl_wdog, 81 1.26 pgoyette NULL, NULL, NULL 82 1.26 pgoyette }; 83 1.26 pgoyette 84 1.29 pgoyette MODULE(MODULE_CLASS_DRIVER, sysmon_wdog, "sysmon"); 85 1.26 pgoyette 86 1.27 pgoyette ONCE_DECL(once_wdog); 87 1.27 pgoyette 88 1.27 pgoyette static int 89 1.27 pgoyette wdog_preinit(void) 90 1.27 pgoyette { 91 1.27 pgoyette 92 1.27 pgoyette mutex_init(&sysmon_wdog_list_mtx, MUTEX_DEFAULT, IPL_NONE); 93 1.27 pgoyette mutex_init(&sysmon_wdog_mtx, MUTEX_DEFAULT, IPL_SOFTCLOCK); 94 1.27 pgoyette cv_init(&sysmon_wdog_cv, "wdogref"); 95 1.28 matt callout_init(&sysmon_wdog_callout, 0); 96 1.27 pgoyette 97 1.27 pgoyette return 0; 98 1.27 pgoyette } 99 1.27 pgoyette 100 1.26 pgoyette int 101 1.20 xtraeme sysmon_wdog_init(void) 102 1.20 xtraeme { 103 1.26 pgoyette int error; 104 1.26 pgoyette 105 1.27 pgoyette (void)RUN_ONCE(&once_wdog, wdog_preinit); 106 1.27 pgoyette 107 1.25 matt sysmon_wdog_sdhook = shutdownhook_establish(sysmon_wdog_shutdown, NULL); 108 1.25 matt if (sysmon_wdog_sdhook == NULL) 109 1.25 matt printf("WARNING: unable to register watchdog shutdown hook\n"); 110 1.25 matt sysmon_wdog_cphook = critpollhook_establish(sysmon_wdog_critpoll, NULL); 111 1.25 matt if (sysmon_wdog_cphook == NULL) 112 1.25 matt printf("WARNING: unable to register watchdog critpoll hook\n"); 113 1.26 pgoyette 114 1.26 pgoyette error = sysmon_attach_minor(SYSMON_MINOR_WDOG, &sysmon_wdog_opvec); 115 1.26 pgoyette 116 1.26 pgoyette return error; 117 1.26 pgoyette } 118 1.26 pgoyette 119 1.26 pgoyette int 120 1.26 pgoyette sysmon_wdog_fini(void) 121 1.26 pgoyette { 122 1.26 pgoyette int error; 123 1.26 pgoyette 124 1.26 pgoyette if ( ! LIST_EMPTY(&sysmon_wdog_list)) 125 1.26 pgoyette return EBUSY; 126 1.26 pgoyette 127 1.26 pgoyette error = sysmon_attach_minor(SYSMON_MINOR_WDOG, NULL); 128 1.26 pgoyette 129 1.26 pgoyette if (error == 0) { 130 1.26 pgoyette callout_destroy(&sysmon_wdog_callout); 131 1.26 pgoyette critpollhook_disestablish(sysmon_wdog_cphook); 132 1.26 pgoyette shutdownhook_disestablish(sysmon_wdog_sdhook); 133 1.26 pgoyette cv_destroy(&sysmon_wdog_cv); 134 1.26 pgoyette mutex_destroy(&sysmon_wdog_mtx); 135 1.26 pgoyette mutex_destroy(&sysmon_wdog_list_mtx); 136 1.26 pgoyette } 137 1.26 pgoyette 138 1.26 pgoyette return error; 139 1.20 xtraeme } 140 1.20 xtraeme 141 1.1 thorpej /* 142 1.1 thorpej * sysmonopen_wdog: 143 1.1 thorpej * 144 1.1 thorpej * Open the system monitor device. 145 1.1 thorpej */ 146 1.1 thorpej int 147 1.20 xtraeme sysmonopen_wdog(dev_t dev, int flag, int mode, struct lwp *l) 148 1.1 thorpej { 149 1.1 thorpej 150 1.20 xtraeme return 0; 151 1.1 thorpej } 152 1.1 thorpej 153 1.1 thorpej /* 154 1.1 thorpej * sysmonclose_wdog: 155 1.1 thorpej * 156 1.1 thorpej * Close the system monitor device. 157 1.1 thorpej */ 158 1.1 thorpej int 159 1.20 xtraeme sysmonclose_wdog(dev_t dev, int flag, int mode, struct lwp *l) 160 1.1 thorpej { 161 1.1 thorpej struct sysmon_wdog *smw; 162 1.20 xtraeme int error = 0; 163 1.1 thorpej 164 1.1 thorpej /* 165 1.1 thorpej * If this is the last close, and there is a watchdog 166 1.1 thorpej * running in UTICKLE mode, we need to disable it, 167 1.1 thorpej * otherwise the system will reset in short order. 168 1.1 thorpej * 169 1.1 thorpej * XXX Maybe we should just go into KTICKLE mode? 170 1.1 thorpej */ 171 1.20 xtraeme mutex_enter(&sysmon_wdog_mtx); 172 1.1 thorpej if ((smw = sysmon_armed_wdog) != NULL) { 173 1.11 drochner if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_UTICKLE) { 174 1.1 thorpej error = sysmon_wdog_setmode(smw, 175 1.1 thorpej WDOG_MODE_DISARMED, smw->smw_period); 176 1.1 thorpej if (error) { 177 1.1 thorpej printf("WARNING: UNABLE TO DISARM " 178 1.1 thorpej "WATCHDOG %s ON CLOSE!\n", 179 1.1 thorpej smw->smw_name); 180 1.1 thorpej /* 181 1.1 thorpej * ...we will probably reboot soon. 182 1.1 thorpej */ 183 1.1 thorpej } 184 1.1 thorpej } 185 1.1 thorpej } 186 1.20 xtraeme mutex_exit(&sysmon_wdog_mtx); 187 1.1 thorpej 188 1.20 xtraeme return error; 189 1.1 thorpej } 190 1.1 thorpej 191 1.1 thorpej /* 192 1.1 thorpej * sysmonioctl_wdog: 193 1.1 thorpej * 194 1.1 thorpej * Perform a watchdog control request. 195 1.1 thorpej */ 196 1.1 thorpej int 197 1.20 xtraeme sysmonioctl_wdog(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 198 1.1 thorpej { 199 1.1 thorpej struct sysmon_wdog *smw; 200 1.20 xtraeme int error = 0; 201 1.1 thorpej 202 1.1 thorpej switch (cmd) { 203 1.1 thorpej case WDOGIOC_GMODE: 204 1.1 thorpej { 205 1.1 thorpej struct wdog_mode *wm = (void *) data; 206 1.1 thorpej 207 1.1 thorpej wm->wm_name[sizeof(wm->wm_name) - 1] = '\0'; 208 1.1 thorpej smw = sysmon_wdog_find(wm->wm_name); 209 1.1 thorpej if (smw == NULL) { 210 1.1 thorpej error = ESRCH; 211 1.1 thorpej break; 212 1.1 thorpej } 213 1.1 thorpej 214 1.1 thorpej wm->wm_mode = smw->smw_mode; 215 1.1 thorpej wm->wm_period = smw->smw_period; 216 1.1 thorpej sysmon_wdog_release(smw); 217 1.1 thorpej break; 218 1.1 thorpej } 219 1.1 thorpej 220 1.1 thorpej case WDOGIOC_SMODE: 221 1.1 thorpej { 222 1.1 thorpej struct wdog_mode *wm = (void *) data; 223 1.1 thorpej 224 1.1 thorpej if ((flag & FWRITE) == 0) { 225 1.1 thorpej error = EPERM; 226 1.1 thorpej break; 227 1.1 thorpej } 228 1.1 thorpej 229 1.1 thorpej wm->wm_name[sizeof(wm->wm_name) - 1] = '\0'; 230 1.1 thorpej smw = sysmon_wdog_find(wm->wm_name); 231 1.1 thorpej if (smw == NULL) { 232 1.1 thorpej error = ESRCH; 233 1.1 thorpej break; 234 1.1 thorpej } 235 1.1 thorpej 236 1.1 thorpej if (wm->wm_mode & ~(WDOG_MODE_MASK|WDOG_FEATURE_MASK)) 237 1.1 thorpej error = EINVAL; 238 1.1 thorpej else { 239 1.20 xtraeme mutex_enter(&sysmon_wdog_mtx); 240 1.1 thorpej error = sysmon_wdog_setmode(smw, wm->wm_mode, 241 1.1 thorpej wm->wm_period); 242 1.20 xtraeme mutex_exit(&sysmon_wdog_mtx); 243 1.1 thorpej } 244 1.1 thorpej 245 1.1 thorpej sysmon_wdog_release(smw); 246 1.1 thorpej break; 247 1.1 thorpej } 248 1.1 thorpej 249 1.1 thorpej case WDOGIOC_WHICH: 250 1.1 thorpej { 251 1.1 thorpej struct wdog_mode *wm = (void *) data; 252 1.1 thorpej 253 1.20 xtraeme mutex_enter(&sysmon_wdog_mtx); 254 1.1 thorpej if ((smw = sysmon_armed_wdog) != NULL) { 255 1.1 thorpej strcpy(wm->wm_name, smw->smw_name); 256 1.1 thorpej wm->wm_mode = smw->smw_mode; 257 1.1 thorpej wm->wm_period = smw->smw_period; 258 1.1 thorpej } else 259 1.1 thorpej error = ESRCH; 260 1.20 xtraeme mutex_exit(&sysmon_wdog_mtx); 261 1.1 thorpej break; 262 1.1 thorpej } 263 1.1 thorpej 264 1.1 thorpej case WDOGIOC_TICKLE: 265 1.1 thorpej if ((flag & FWRITE) == 0) { 266 1.1 thorpej error = EPERM; 267 1.1 thorpej break; 268 1.1 thorpej } 269 1.1 thorpej 270 1.20 xtraeme mutex_enter(&sysmon_wdog_mtx); 271 1.1 thorpej if ((smw = sysmon_armed_wdog) != NULL) { 272 1.1 thorpej error = (*smw->smw_tickle)(smw); 273 1.1 thorpej if (error == 0) 274 1.12 christos smw->smw_tickler = l->l_proc->p_pid; 275 1.1 thorpej } else 276 1.1 thorpej error = ESRCH; 277 1.20 xtraeme mutex_exit(&sysmon_wdog_mtx); 278 1.1 thorpej break; 279 1.1 thorpej 280 1.1 thorpej case WDOGIOC_GTICKLER: 281 1.4 simonb if ((smw = sysmon_armed_wdog) != NULL) 282 1.4 simonb *(pid_t *)data = smw->smw_tickler; 283 1.4 simonb else 284 1.4 simonb error = ESRCH; 285 1.1 thorpej break; 286 1.1 thorpej 287 1.1 thorpej case WDOGIOC_GWDOGS: 288 1.1 thorpej { 289 1.1 thorpej struct wdog_conf *wc = (void *) data; 290 1.1 thorpej char *cp; 291 1.1 thorpej int i; 292 1.1 thorpej 293 1.20 xtraeme mutex_enter(&sysmon_wdog_list_mtx); 294 1.1 thorpej if (wc->wc_names == NULL) 295 1.1 thorpej wc->wc_count = sysmon_wdog_count; 296 1.1 thorpej else { 297 1.1 thorpej for (i = 0, cp = wc->wc_names, 298 1.1 thorpej smw = LIST_FIRST(&sysmon_wdog_list); 299 1.1 thorpej i < sysmon_wdog_count && smw != NULL && error == 0; 300 1.1 thorpej i++, cp += WDOG_NAMESIZE, 301 1.1 thorpej smw = LIST_NEXT(smw, smw_list)) 302 1.1 thorpej error = copyout(smw->smw_name, cp, 303 1.1 thorpej strlen(smw->smw_name) + 1); 304 1.1 thorpej wc->wc_count = i; 305 1.1 thorpej } 306 1.20 xtraeme mutex_exit(&sysmon_wdog_list_mtx); 307 1.1 thorpej break; 308 1.1 thorpej } 309 1.1 thorpej 310 1.1 thorpej default: 311 1.1 thorpej error = ENOTTY; 312 1.1 thorpej } 313 1.1 thorpej 314 1.20 xtraeme return error; 315 1.1 thorpej } 316 1.1 thorpej 317 1.1 thorpej /* 318 1.1 thorpej * sysmon_wdog_register: 319 1.1 thorpej * 320 1.1 thorpej * Register a watchdog device. 321 1.1 thorpej */ 322 1.1 thorpej int 323 1.1 thorpej sysmon_wdog_register(struct sysmon_wdog *smw) 324 1.1 thorpej { 325 1.1 thorpej struct sysmon_wdog *lsmw; 326 1.1 thorpej int error = 0; 327 1.1 thorpej 328 1.27 pgoyette (void)RUN_ONCE(&once_wdog, wdog_preinit); 329 1.27 pgoyette 330 1.20 xtraeme mutex_enter(&sysmon_wdog_list_mtx); 331 1.1 thorpej 332 1.23 dyoung LIST_FOREACH(lsmw, &sysmon_wdog_list, smw_list) { 333 1.1 thorpej if (strcmp(lsmw->smw_name, smw->smw_name) == 0) { 334 1.1 thorpej error = EEXIST; 335 1.1 thorpej goto out; 336 1.1 thorpej } 337 1.1 thorpej } 338 1.1 thorpej 339 1.1 thorpej smw->smw_mode = WDOG_MODE_DISARMED; 340 1.1 thorpej smw->smw_tickler = (pid_t) -1; 341 1.1 thorpej smw->smw_refcnt = 0; 342 1.1 thorpej sysmon_wdog_count++; 343 1.1 thorpej LIST_INSERT_HEAD(&sysmon_wdog_list, smw, smw_list); 344 1.1 thorpej 345 1.1 thorpej out: 346 1.20 xtraeme mutex_exit(&sysmon_wdog_list_mtx); 347 1.20 xtraeme return error; 348 1.1 thorpej } 349 1.1 thorpej 350 1.1 thorpej /* 351 1.1 thorpej * sysmon_wdog_unregister: 352 1.1 thorpej * 353 1.1 thorpej * Unregister a watchdog device. 354 1.1 thorpej */ 355 1.24 dyoung int 356 1.1 thorpej sysmon_wdog_unregister(struct sysmon_wdog *smw) 357 1.1 thorpej { 358 1.24 dyoung int rc = 0; 359 1.1 thorpej 360 1.20 xtraeme mutex_enter(&sysmon_wdog_list_mtx); 361 1.24 dyoung while (smw->smw_refcnt > 0 && rc == 0) { 362 1.24 dyoung aprint_debug("%s: %d users remain\n", smw->smw_name, 363 1.24 dyoung smw->smw_refcnt); 364 1.24 dyoung rc = cv_wait_sig(&sysmon_wdog_cv, &sysmon_wdog_list_mtx); 365 1.24 dyoung } 366 1.24 dyoung if (rc == 0) { 367 1.24 dyoung sysmon_wdog_count--; 368 1.24 dyoung LIST_REMOVE(smw, smw_list); 369 1.24 dyoung } 370 1.20 xtraeme mutex_exit(&sysmon_wdog_list_mtx); 371 1.24 dyoung return rc; 372 1.1 thorpej } 373 1.1 thorpej 374 1.1 thorpej /* 375 1.25 matt * sysmon_wdog_critpoll: 376 1.25 matt * 377 1.25 matt * Perform critical operations during long polling periods 378 1.25 matt */ 379 1.25 matt void 380 1.25 matt sysmon_wdog_critpoll(void *arg) 381 1.25 matt { 382 1.25 matt struct sysmon_wdog *smw = sysmon_armed_wdog; 383 1.25 matt 384 1.25 matt if (smw == NULL) 385 1.25 matt return; 386 1.25 matt 387 1.25 matt if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_KTICKLE) { 388 1.25 matt if ((*smw->smw_tickle)(smw) != 0) { 389 1.25 matt printf("WARNING: KERNEL TICKLE OF WATCHDOG %s " 390 1.25 matt "FAILED!\n", smw->smw_name); 391 1.25 matt } 392 1.25 matt } 393 1.25 matt } 394 1.25 matt 395 1.25 matt /* 396 1.1 thorpej * sysmon_wdog_find: 397 1.1 thorpej * 398 1.1 thorpej * Find a watchdog device. We increase the reference 399 1.1 thorpej * count on a match. 400 1.1 thorpej */ 401 1.1 thorpej struct sysmon_wdog * 402 1.1 thorpej sysmon_wdog_find(const char *name) 403 1.1 thorpej { 404 1.1 thorpej struct sysmon_wdog *smw; 405 1.1 thorpej 406 1.20 xtraeme mutex_enter(&sysmon_wdog_list_mtx); 407 1.1 thorpej 408 1.23 dyoung LIST_FOREACH(smw, &sysmon_wdog_list, smw_list) { 409 1.1 thorpej if (strcmp(smw->smw_name, name) == 0) 410 1.1 thorpej break; 411 1.1 thorpej } 412 1.1 thorpej 413 1.1 thorpej if (smw != NULL) 414 1.1 thorpej smw->smw_refcnt++; 415 1.1 thorpej 416 1.20 xtraeme mutex_exit(&sysmon_wdog_list_mtx); 417 1.20 xtraeme return smw; 418 1.1 thorpej } 419 1.1 thorpej 420 1.1 thorpej /* 421 1.1 thorpej * sysmon_wdog_release: 422 1.1 thorpej * 423 1.1 thorpej * Release a watchdog device. 424 1.1 thorpej */ 425 1.1 thorpej void 426 1.1 thorpej sysmon_wdog_release(struct sysmon_wdog *smw) 427 1.1 thorpej { 428 1.1 thorpej 429 1.20 xtraeme mutex_enter(&sysmon_wdog_list_mtx); 430 1.1 thorpej KASSERT(smw->smw_refcnt != 0); 431 1.1 thorpej smw->smw_refcnt--; 432 1.24 dyoung cv_signal(&sysmon_wdog_cv); 433 1.24 dyoung mutex_exit(&sysmon_wdog_list_mtx); 434 1.24 dyoung } 435 1.24 dyoung 436 1.24 dyoung void 437 1.24 dyoung sysmon_wdog_ref(struct sysmon_wdog *smw) 438 1.24 dyoung { 439 1.24 dyoung mutex_enter(&sysmon_wdog_list_mtx); 440 1.24 dyoung smw->smw_refcnt++; 441 1.20 xtraeme mutex_exit(&sysmon_wdog_list_mtx); 442 1.1 thorpej } 443 1.1 thorpej 444 1.1 thorpej /* 445 1.1 thorpej * sysmon_wdog_setmode: 446 1.1 thorpej * 447 1.1 thorpej * Set the mode of a watchdog device. 448 1.1 thorpej */ 449 1.1 thorpej int 450 1.1 thorpej sysmon_wdog_setmode(struct sysmon_wdog *smw, int mode, u_int period) 451 1.1 thorpej { 452 1.1 thorpej u_int operiod = smw->smw_period; 453 1.1 thorpej int omode = smw->smw_mode; 454 1.1 thorpej int error = 0; 455 1.1 thorpej 456 1.1 thorpej smw->smw_period = period; 457 1.1 thorpej smw->smw_mode = mode; 458 1.1 thorpej 459 1.1 thorpej switch (mode & WDOG_MODE_MASK) { 460 1.1 thorpej case WDOG_MODE_DISARMED: 461 1.1 thorpej if (smw != sysmon_armed_wdog) { 462 1.1 thorpej error = EINVAL; 463 1.1 thorpej goto out; 464 1.1 thorpej } 465 1.1 thorpej break; 466 1.1 thorpej 467 1.1 thorpej case WDOG_MODE_KTICKLE: 468 1.1 thorpej case WDOG_MODE_UTICKLE: 469 1.10 smb case WDOG_MODE_ETICKLE: 470 1.1 thorpej if (sysmon_armed_wdog != NULL) { 471 1.1 thorpej error = EBUSY; 472 1.1 thorpej goto out; 473 1.1 thorpej } 474 1.1 thorpej break; 475 1.1 thorpej 476 1.1 thorpej default: 477 1.1 thorpej error = EINVAL; 478 1.1 thorpej goto out; 479 1.1 thorpej } 480 1.1 thorpej 481 1.1 thorpej error = (*smw->smw_setmode)(smw); 482 1.1 thorpej 483 1.1 thorpej out: 484 1.1 thorpej if (error) { 485 1.1 thorpej smw->smw_period = operiod; 486 1.1 thorpej smw->smw_mode = omode; 487 1.1 thorpej } else { 488 1.1 thorpej if ((mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 489 1.2 thorpej sysmon_armed_wdog = NULL; 490 1.1 thorpej smw->smw_tickler = (pid_t) -1; 491 1.24 dyoung sysmon_wdog_release(smw); 492 1.1 thorpej if ((omode & WDOG_MODE_MASK) == WDOG_MODE_KTICKLE) 493 1.1 thorpej callout_stop(&sysmon_wdog_callout); 494 1.1 thorpej } else { 495 1.1 thorpej sysmon_armed_wdog = smw; 496 1.24 dyoung sysmon_wdog_ref(smw); 497 1.1 thorpej if ((mode & WDOG_MODE_MASK) == WDOG_MODE_KTICKLE) { 498 1.1 thorpej callout_reset(&sysmon_wdog_callout, 499 1.1 thorpej WDOG_PERIOD_TO_TICKS(smw->smw_period) / 2, 500 1.1 thorpej sysmon_wdog_ktickle, NULL); 501 1.1 thorpej } 502 1.1 thorpej } 503 1.1 thorpej } 504 1.20 xtraeme return error; 505 1.1 thorpej } 506 1.1 thorpej 507 1.1 thorpej /* 508 1.1 thorpej * sysmon_wdog_ktickle: 509 1.1 thorpej * 510 1.1 thorpej * Kernel watchdog tickle routine. 511 1.1 thorpej */ 512 1.1 thorpej void 513 1.14 christos sysmon_wdog_ktickle(void *arg) 514 1.1 thorpej { 515 1.1 thorpej struct sysmon_wdog *smw; 516 1.1 thorpej 517 1.20 xtraeme mutex_enter(&sysmon_wdog_mtx); 518 1.1 thorpej if ((smw = sysmon_armed_wdog) != NULL) { 519 1.1 thorpej if ((*smw->smw_tickle)(smw) != 0) { 520 1.1 thorpej printf("WARNING: KERNEL TICKLE OF WATCHDOG %s " 521 1.1 thorpej "FAILED!\n", smw->smw_name); 522 1.1 thorpej /* 523 1.1 thorpej * ...we will probably reboot soon. 524 1.1 thorpej */ 525 1.1 thorpej } 526 1.1 thorpej callout_reset(&sysmon_wdog_callout, 527 1.1 thorpej WDOG_PERIOD_TO_TICKS(smw->smw_period) / 2, 528 1.1 thorpej sysmon_wdog_ktickle, NULL); 529 1.1 thorpej } 530 1.20 xtraeme mutex_exit(&sysmon_wdog_mtx); 531 1.1 thorpej } 532 1.1 thorpej 533 1.1 thorpej /* 534 1.1 thorpej * sysmon_wdog_shutdown: 535 1.1 thorpej * 536 1.1 thorpej * Perform shutdown-time operations. 537 1.1 thorpej */ 538 1.1 thorpej void 539 1.14 christos sysmon_wdog_shutdown(void *arg) 540 1.1 thorpej { 541 1.1 thorpej struct sysmon_wdog *smw; 542 1.1 thorpej 543 1.1 thorpej /* 544 1.1 thorpej * XXX Locking here? I don't think it's necessary. 545 1.1 thorpej */ 546 1.1 thorpej 547 1.1 thorpej if ((smw = sysmon_armed_wdog) != NULL) { 548 1.1 thorpej if (sysmon_wdog_setmode(smw, WDOG_MODE_DISARMED, 549 1.1 thorpej smw->smw_period)) 550 1.1 thorpej printf("WARNING: FAILED TO SHUTDOWN WATCHDOG %s!\n", 551 1.1 thorpej smw->smw_name); 552 1.1 thorpej } 553 1.1 thorpej } 554 1.30 riastrad 555 1.30 riastrad static int 556 1.26 pgoyette sysmon_wdog_modcmd(modcmd_t cmd, void *arg) 557 1.26 pgoyette { 558 1.26 pgoyette int ret; 559 1.30 riastrad 560 1.26 pgoyette switch (cmd) { 561 1.26 pgoyette case MODULE_CMD_INIT: 562 1.26 pgoyette ret = sysmon_wdog_init(); 563 1.26 pgoyette break; 564 1.26 pgoyette case MODULE_CMD_FINI: 565 1.26 pgoyette ret = sysmon_wdog_fini(); 566 1.30 riastrad break; 567 1.26 pgoyette case MODULE_CMD_STAT: 568 1.26 pgoyette default: 569 1.26 pgoyette ret = ENOTTY; 570 1.26 pgoyette } 571 1.30 riastrad 572 1.30 riastrad return ret; 573 1.26 pgoyette } 574