1 /*- 2 * Copyright (c) 1986, 1988, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 39 * $Id: kern_shutdown.c,v 1.40 1998/09/20 16:50:31 dt Exp $ 40 */ 41 42 #include "opt_ddb.h" 43 #include "opt_hw_wdog.h" 44 #include "opt_panic.h" 45 #include "opt_show_busybufs.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/buf.h> 50 #include <sys/reboot.h> 51 #include <sys/proc.h> 52 #include <sys/malloc.h> 53 #include <sys/kernel.h> 54 #include <sys/mount.h> 55 #include <sys/queue.h> 56 #include <sys/sysctl.h> 57 #include <sys/conf.h> 58 #include <sys/sysproto.h> 59 60 #include <machine/pcb.h> 61 #include <machine/clock.h> 62 #include <machine/cons.h> 63 #include <machine/md_var.h> 64 #ifdef SMP 65 #include <machine/smp.h> /* smp_active, cpuid */ 66 #endif 67 68 #include <sys/signalvar.h> 69 70 #ifndef PANIC_REBOOT_WAIT_TIME 71 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 72 #endif 73 74 /* 75 * Note that stdarg.h and the ANSI style va_start macro is used for both 76 * ANSI and traditional C compilers. 77 */ 78 #include <machine/stdarg.h> 79 80 #ifdef DDB 81 #ifdef DDB_UNATTENDED 82 static int debugger_on_panic = 0; 83 #else 84 static int debugger_on_panic = 1; 85 #endif 86 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 87 &debugger_on_panic, 0, ""); 88 #endif 89 90 #ifdef HW_WDOG 91 /* 92 * If there is a hardware watchdog, point this at the function needed to 93 * hold it off. 94 * It's needed when the kernel needs to do some lengthy operations. 95 * e.g. in wd.c when dumping core.. It's most annoying to have 96 * your precious core-dump only half written because the wdog kicked in. 97 */ 98 watchdog_tickle_fn wdog_tickler = NULL; 99 #endif /* HW_WDOG */ 100 101 /* 102 * Variable panicstr contains argument to first call to panic; used as flag 103 * to indicate that the kernel has already called panic. 104 */ 105 const char *panicstr; 106 107 /* 108 * callout list for things to do a shutdown 109 */ 110 typedef struct shutdown_list_element { 111 LIST_ENTRY(shutdown_list_element) links; 112 bootlist_fn function; 113 void *arg; 114 int priority; 115 } *sle_p; 116 117 /* 118 * There are three shutdown lists. Some things need to be shut down 119 * earlier than others. 120 */ 121 LIST_HEAD(shutdown_list, shutdown_list_element); 122 123 static struct shutdown_list shutdown_lists[SHUTDOWN_FINAL + 1]; 124 125 static void boot __P((int)) __dead2; 126 static void dumpsys __P((void)); 127 128 #ifndef _SYS_SYSPROTO_H_ 129 struct reboot_args { 130 int opt; 131 }; 132 #endif 133 /* ARGSUSED */ 134 135 /* 136 * The system call that results in a reboot 137 */ 138 int 139 reboot(p, uap) 140 struct proc *p; 141 struct reboot_args *uap; 142 { 143 int error; 144 145 if ((error = suser(p->p_ucred, &p->p_acflag))) 146 return (error); 147 148 boot(uap->opt); 149 return (0); 150 } 151 152 /* 153 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 154 */ 155 void 156 shutdown_nice() 157 { 158 /* Send a signal to init(8) and have it shutdown the world */ 159 if (initproc != NULL) { 160 psignal(initproc, SIGINT); 161 } else { 162 /* No init(8) running, so simply reboot */ 163 boot(RB_NOSYNC); 164 } 165 return; 166 } 167 static int waittime = -1; 168 static struct pcb dumppcb; 169 170 /* 171 * Go through the rigmarole of shutting down.. 172 * this used to be in machdep.c but I'll be dammned if I could see 173 * anything machine dependant in it. 174 */ 175 static void 176 boot(howto) 177 int howto; 178 { 179 sle_p ep; 180 181 #ifdef SMP 182 if (smp_active) { 183 printf("boot() called on cpu#%d\n", cpuid); 184 } 185 #endif 186 /* 187 * Do any callouts that should be done BEFORE syncing the filesystems. 188 */ 189 LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_PRE_SYNC], links) 190 (*ep->function)(howto, ep->arg); 191 192 /* 193 * Now sync filesystems 194 */ 195 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 196 register struct buf *bp; 197 int iter, nbusy; 198 199 waittime = 0; 200 printf("\nsyncing disks... "); 201 202 sync(&proc0, NULL); 203 204 /* 205 * With soft updates, some buffers that are 206 * written will be remarked as dirty until other 207 * buffers are written. 208 */ 209 for (iter = 0; iter < 20; iter++) { 210 nbusy = 0; 211 for (bp = &buf[nbuf]; --bp >= buf; ) { 212 if ((bp->b_flags & (B_BUSY | B_INVAL)) 213 == B_BUSY) { 214 nbusy++; 215 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 216 == B_DELWRI) { 217 /* bawrite(bp);*/ 218 nbusy++; 219 } 220 } 221 if (nbusy == 0) 222 break; 223 printf("%d ", nbusy); 224 sync(&proc0, NULL); 225 DELAY(50000 * iter); 226 } 227 if (nbusy) { 228 /* 229 * Failed to sync all blocks. Indicate this and don't 230 * unmount filesystems (thus forcing an fsck on reboot). 231 */ 232 printf("giving up\n"); 233 #ifdef SHOW_BUSYBUFS 234 nbusy = 0; 235 for (bp = &buf[nbuf]; --bp >= buf; ) { 236 if ((bp->b_flags & (B_BUSY | B_INVAL)) 237 == B_BUSY) { 238 nbusy++; 239 printf( 240 "%d: dev:%08lx, flags:%08lx, blkno:%ld, lblkno:%ld\n", 241 nbusy, (u_long)bp->b_dev, 242 bp->b_flags, (long)bp->b_blkno, 243 (long)bp->b_lblkno); 244 } 245 } 246 DELAY(5000000); /* 5 seconds */ 247 #endif 248 } else { 249 printf("done\n"); 250 /* 251 * Unmount filesystems 252 */ 253 if (panicstr == 0) 254 vfs_unmountall(); 255 } 256 DELAY(100000); /* wait for console output to finish */ 257 } 258 259 /* 260 * Ok, now do things that assume all filesystem activity has 261 * been completed. 262 */ 263 LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_POST_SYNC], links) 264 (*ep->function)(howto, ep->arg); 265 splhigh(); 266 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) { 267 savectx(&dumppcb); 268 #ifdef __i386__ 269 dumppcb.pcb_cr3 = rcr3(); 270 #endif 271 dumpsys(); 272 } 273 274 /* Now that we're going to really halt the system... */ 275 LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_FINAL], links) 276 (*ep->function)(howto, ep->arg); 277 278 if (howto & RB_HALT) { 279 printf("\n"); 280 printf("The operating system has halted.\n"); 281 printf("Please press any key to reboot.\n\n"); 282 switch (cngetc()) { 283 case -1: /* No console, just die */ 284 cpu_halt(); 285 /* NOTREACHED */ 286 default: 287 howto &= ~RB_HALT; 288 break; 289 } 290 } else if (howto & RB_DUMP) { 291 /* System Paniced */ 292 293 if (PANIC_REBOOT_WAIT_TIME != 0) { 294 if (PANIC_REBOOT_WAIT_TIME != -1) { 295 int loop; 296 printf("Automatic reboot in %d seconds - " 297 "press a key on the console to abort\n", 298 PANIC_REBOOT_WAIT_TIME); 299 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 300 loop > 0; --loop) { 301 DELAY(1000 * 100); /* 1/10th second */ 302 /* Did user type a key? */ 303 if (cncheckc() != -1) 304 break; 305 } 306 if (!loop) 307 goto die; 308 } 309 } else { /* zero time specified - reboot NOW */ 310 goto die; 311 } 312 printf("--> Press a key on the console to reboot <--\n"); 313 cngetc(); 314 } 315 die: 316 printf("Rebooting...\n"); 317 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 318 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 319 cpu_reset(); 320 for(;;) ; 321 /* NOTREACHED */ 322 } 323 324 /* 325 * Magic number for savecore 326 * 327 * exported (symorder) and used at least by savecore(8) 328 * 329 */ 330 static u_long const dumpmag = 0x8fca0101UL; 331 332 static int dumpsize = 0; /* also for savecore */ 333 334 static int dodump = 1; 335 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 336 337 /* ARGSUSED */ 338 static void dump_conf __P((void *dummy)); 339 static void 340 dump_conf(dummy) 341 void *dummy; 342 { 343 cpu_dumpconf(); 344 } 345 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 346 347 /* 348 * Doadump comes here after turning off memory management and 349 * getting on the dump stack, either when called above, or by 350 * the auto-restart code. 351 */ 352 static void 353 dumpsys(void) 354 { 355 356 if (!dodump) 357 return; 358 if (dumpdev == NODEV) 359 return; 360 if (!(bdevsw[major(dumpdev)])) 361 return; 362 if (!(bdevsw[major(dumpdev)]->d_dump)) 363 return; 364 dumpsize = Maxmem; 365 printf("\ndumping to dev %lx, offset %ld\n", (u_long)dumpdev, dumplo); 366 printf("dump "); 367 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 368 369 case ENXIO: 370 printf("device bad\n"); 371 break; 372 373 case EFAULT: 374 printf("device not ready\n"); 375 break; 376 377 case EINVAL: 378 printf("area improper\n"); 379 break; 380 381 case EIO: 382 printf("i/o error\n"); 383 break; 384 385 case EINTR: 386 printf("aborted from console\n"); 387 break; 388 389 default: 390 printf("succeeded\n"); 391 break; 392 } 393 } 394 395 /* 396 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 397 * and then reboots. If we are called twice, then we avoid trying to sync 398 * the disks as this often leads to recursive panics. 399 */ 400 void 401 panic(const char *fmt, ...) 402 { 403 int bootopt; 404 va_list ap; 405 static char buf[256]; 406 407 bootopt = RB_AUTOBOOT | RB_DUMP; 408 if (panicstr) 409 bootopt |= RB_NOSYNC; 410 else 411 panicstr = fmt; 412 413 va_start(ap, fmt); 414 (void)vsprintf(buf, fmt, ap); 415 if (panicstr == fmt) 416 panicstr = buf; 417 va_end(ap); 418 printf("panic: %s\n", buf); 419 #ifdef SMP 420 /* three seperate prints in case of an unmapped page and trap */ 421 printf("mp_lock = %08x; ", mp_lock); 422 printf("cpuid = %d; ", cpuid); 423 printf("lapic.id = %08x\n", lapic.id); 424 #endif 425 426 #if defined(DDB) 427 if (debugger_on_panic) 428 Debugger ("panic"); 429 #endif 430 boot(bootopt); 431 } 432 433 /* 434 * Three routines to handle adding/deleting items on the 435 * shutdown callout lists 436 * 437 * at_shutdown(): 438 * Take the arguments given and put them onto the shutdown callout list. 439 * However first make sure that it's not already there. 440 * returns 0 on success. 441 */ 442 int 443 at_shutdown(bootlist_fn function, void *arg, int queue) 444 { 445 return(at_shutdown_pri(function, arg, queue, SHUTDOWN_PRI_DEFAULT)); 446 } 447 448 /* 449 * at_shutdown_pri(): 450 * Take the arguments given and put them onto the shutdown callout list 451 * with the given execution priority. 452 * returns 0 on success. 453 */ 454 int 455 at_shutdown_pri(bootlist_fn function, void *arg, int queue, int pri) 456 { 457 sle_p ep, ip; 458 459 if (queue < SHUTDOWN_PRE_SYNC 460 || queue > SHUTDOWN_FINAL) { 461 printf("at_shutdown: bad exit callout queue %d specified\n", 462 queue); 463 return (EINVAL); 464 } 465 if (rm_at_shutdown(function, arg)) 466 printf("at_shutdown: exit callout entry was already present\n"); 467 ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT); 468 if (ep == NULL) 469 return (ENOMEM); 470 ep->function = function; 471 ep->arg = arg; 472 ep->priority = pri; 473 474 /* Sort into list of items on this queue */ 475 ip = LIST_FIRST(&shutdown_lists[queue]); 476 if (ip == NULL) { 477 LIST_INSERT_HEAD(&shutdown_lists[queue], ep, links); 478 } else { 479 for (; LIST_NEXT(ip, links) != NULL; ip = LIST_NEXT(ip, links)) { 480 if (ep->priority < ip->priority) { 481 LIST_INSERT_BEFORE(ip, ep, links); 482 ep = NULL; 483 break; 484 } 485 } 486 if (ep != NULL) 487 LIST_INSERT_AFTER(ip, ep, links); 488 } 489 return (0); 490 } 491 492 /* 493 * Scan the exit callout lists for the given items and remove them. 494 * Returns the number of items removed. 495 */ 496 int 497 rm_at_shutdown(bootlist_fn function, void *arg) 498 { 499 sle_p ep; 500 int count; 501 int queue; 502 503 count = 0; 504 for (queue = SHUTDOWN_PRE_SYNC; queue < SHUTDOWN_FINAL; queue++) { 505 LIST_FOREACH(ep, &shutdown_lists[queue], links) { 506 if ((ep->function == function) && (ep->arg == arg)) { 507 LIST_REMOVE(ep, links); 508 free(ep, M_TEMP); 509 count++; 510 } 511 } 512 } 513 return (count); 514 } 515