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 1.51 1999/05/08 06:39:38 phk 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/vnode.h> 53 #include <sys/malloc.h> 54 #include <sys/kernel.h> 55 #include <sys/mount.h> 56 #include <sys/queue.h> 57 #include <sys/sysctl.h> 58 #include <sys/conf.h> 59 #include <sys/sysproto.h> 60 61 #include <machine/pcb.h> 62 #include <machine/clock.h> 63 #include <machine/cons.h> 64 #include <machine/md_var.h> 65 #ifdef SMP 66 #include <machine/smp.h> /* smp_active, cpuid */ 67 #endif 68 69 #include <sys/signalvar.h> 70 71 #ifndef PANIC_REBOOT_WAIT_TIME 72 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 73 #endif 74 75 /* 76 * Note that stdarg.h and the ANSI style va_start macro is used for both 77 * ANSI and traditional C compilers. 78 */ 79 #include <machine/stdarg.h> 80 81 #ifdef DDB 82 #ifdef DDB_UNATTENDED 83 int debugger_on_panic = 0; 84 #else 85 int debugger_on_panic = 1; 86 #endif 87 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 88 &debugger_on_panic, 0, "Run debugger on kernel panic"); 89 #endif 90 91 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 92 93 #ifdef HW_WDOG 94 /* 95 * If there is a hardware watchdog, point this at the function needed to 96 * hold it off. 97 * It's needed when the kernel needs to do some lengthy operations. 98 * e.g. in wd.c when dumping core.. It's most annoying to have 99 * your precious core-dump only half written because the wdog kicked in. 100 */ 101 watchdog_tickle_fn wdog_tickler = NULL; 102 #endif /* HW_WDOG */ 103 104 /* 105 * Variable panicstr contains argument to first call to panic; used as flag 106 * to indicate that the kernel has already called panic. 107 */ 108 const char *panicstr; 109 110 /* 111 * callout list for things to do a shutdown 112 */ 113 typedef struct shutdown_list_element { 114 LIST_ENTRY(shutdown_list_element) links; 115 bootlist_fn function; 116 void *arg; 117 int priority; 118 } *sle_p; 119 120 /* 121 * There are three shutdown lists. Some things need to be shut down 122 * earlier than others. 123 */ 124 LIST_HEAD(shutdown_list, shutdown_list_element); 125 126 static struct shutdown_list shutdown_lists[SHUTDOWN_FINAL + 1]; 127 128 static void boot __P((int)) __dead2; 129 static void dumpsys __P((void)); 130 131 #ifndef _SYS_SYSPROTO_H_ 132 struct reboot_args { 133 int opt; 134 }; 135 #endif 136 /* ARGSUSED */ 137 138 /* 139 * The system call that results in a reboot 140 */ 141 int 142 reboot(p, uap) 143 struct proc *p; 144 struct reboot_args *uap; 145 { 146 int error; 147 148 if ((error = suser(p))) 149 return (error); 150 151 boot(uap->opt); 152 return (0); 153 } 154 155 /* 156 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 157 */ 158 void 159 shutdown_nice() 160 { 161 /* Send a signal to init(8) and have it shutdown the world */ 162 if (initproc != NULL) { 163 psignal(initproc, SIGINT); 164 } else { 165 /* No init(8) running, so simply reboot */ 166 boot(RB_NOSYNC); 167 } 168 return; 169 } 170 static int waittime = -1; 171 static struct pcb dumppcb; 172 173 /* 174 * Go through the rigmarole of shutting down.. 175 * this used to be in machdep.c but I'll be dammned if I could see 176 * anything machine dependant in it. 177 */ 178 static void 179 boot(howto) 180 int howto; 181 { 182 sle_p ep; 183 184 #ifdef SMP 185 if (smp_active) { 186 printf("boot() called on cpu#%d\n", cpuid); 187 } 188 #endif 189 /* 190 * Do any callouts that should be done BEFORE syncing the filesystems. 191 */ 192 LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_PRE_SYNC], links) 193 (*ep->function)(howto, ep->arg); 194 195 /* 196 * Now sync filesystems 197 */ 198 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 199 register struct buf *bp; 200 int iter, nbusy; 201 202 waittime = 0; 203 printf("\nsyncing disks... "); 204 205 sync(&proc0, NULL); 206 207 /* 208 * With soft updates, some buffers that are 209 * written will be remarked as dirty until other 210 * buffers are written. 211 */ 212 for (iter = 0; iter < 20; iter++) { 213 nbusy = 0; 214 for (bp = &buf[nbuf]; --bp >= buf; ) { 215 if ((bp->b_flags & (B_BUSY | B_INVAL)) 216 == B_BUSY) { 217 nbusy++; 218 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 219 == B_DELWRI) { 220 /* bawrite(bp);*/ 221 nbusy++; 222 } 223 } 224 if (nbusy == 0) 225 break; 226 printf("%d ", nbusy); 227 sync(&proc0, NULL); 228 DELAY(50000 * iter); 229 } 230 /* 231 * Count only busy local buffers to prevent forcing 232 * a fsck if we're just a client of a wedged NFS server 233 */ 234 nbusy = 0; 235 for (bp = &buf[nbuf]; --bp >= buf; ) { 236 if (((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) || 237 ((bp->b_flags & (B_DELWRI | B_INVAL))== B_DELWRI)) { 238 if(bp->b_dev == NODEV) 239 CIRCLEQ_REMOVE(&mountlist, bp->b_vp->v_mount, mnt_list); 240 else 241 nbusy++; 242 } 243 244 245 } 246 if (nbusy) { 247 /* 248 * Failed to sync all blocks. Indicate this and don't 249 * unmount filesystems (thus forcing an fsck on reboot). 250 */ 251 printf("giving up\n"); 252 #ifdef SHOW_BUSYBUFS 253 nbusy = 0; 254 for (bp = &buf[nbuf]; --bp >= buf; ) { 255 if ((bp->b_flags & (B_BUSY | B_INVAL)) 256 == B_BUSY) { 257 nbusy++; 258 printf( 259 "%d: dev:%08lx, flags:%08lx, blkno:%ld, lblkno:%ld\n", 260 nbusy, (u_long)bp->b_dev, 261 bp->b_flags, (long)bp->b_blkno, 262 (long)bp->b_lblkno); 263 } 264 } 265 DELAY(5000000); /* 5 seconds */ 266 #endif 267 } else { 268 printf("done\n"); 269 /* 270 * Unmount filesystems 271 */ 272 if (panicstr == 0) 273 vfs_unmountall(); 274 } 275 DELAY(100000); /* wait for console output to finish */ 276 } 277 278 /* 279 * Ok, now do things that assume all filesystem activity has 280 * been completed. 281 */ 282 LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_POST_SYNC], links) 283 (*ep->function)(howto, ep->arg); 284 splhigh(); 285 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) { 286 savectx(&dumppcb); 287 #ifdef __i386__ 288 dumppcb.pcb_cr3 = rcr3(); 289 #endif 290 dumpsys(); 291 } 292 293 /* Now that we're going to really halt the system... */ 294 LIST_FOREACH(ep, &shutdown_lists[SHUTDOWN_FINAL], links) 295 (*ep->function)(howto, ep->arg); 296 297 if (howto & RB_HALT) { 298 printf("\n"); 299 printf("The operating system has halted.\n"); 300 printf("Please press any key to reboot.\n\n"); 301 switch (cngetc()) { 302 case -1: /* No console, just die */ 303 cpu_halt(); 304 /* NOTREACHED */ 305 default: 306 howto &= ~RB_HALT; 307 break; 308 } 309 } else if (howto & RB_DUMP) { 310 /* System Paniced */ 311 312 if (PANIC_REBOOT_WAIT_TIME != 0) { 313 if (PANIC_REBOOT_WAIT_TIME != -1) { 314 int loop; 315 printf("Automatic reboot in %d seconds - " 316 "press a key on the console to abort\n", 317 PANIC_REBOOT_WAIT_TIME); 318 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 319 loop > 0; --loop) { 320 DELAY(1000 * 100); /* 1/10th second */ 321 /* Did user type a key? */ 322 if (cncheckc() != -1) 323 break; 324 } 325 if (!loop) 326 goto die; 327 } 328 } else { /* zero time specified - reboot NOW */ 329 goto die; 330 } 331 printf("--> Press a key on the console to reboot <--\n"); 332 cngetc(); 333 } 334 die: 335 printf("Rebooting...\n"); 336 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 337 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 338 cpu_reset(); 339 for(;;) ; 340 /* NOTREACHED */ 341 } 342 343 /* 344 * Magic number for savecore 345 * 346 * exported (symorder) and used at least by savecore(8) 347 * 348 */ 349 static u_long const dumpmag = 0x8fca0101UL; 350 351 static int dumpsize = 0; /* also for savecore */ 352 353 static int dodump = 1; 354 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, 355 &dodump, 0, "Do coredump on kernel panic"); 356 357 /* ARGSUSED */ 358 static void dump_conf __P((void *dummy)); 359 static void 360 dump_conf(dummy) 361 void *dummy; 362 { 363 cpu_dumpconf(); 364 } 365 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 366 367 /* 368 * Doadump comes here after turning off memory management and 369 * getting on the dump stack, either when called above, or by 370 * the auto-restart code. 371 */ 372 static void 373 dumpsys(void) 374 { 375 376 if (!dodump) 377 return; 378 if (dumpdev == NODEV) 379 return; 380 if (!(bdevsw(dumpdev))) 381 return; 382 if (!(bdevsw(dumpdev)->d_dump)) 383 return; 384 dumpsize = Maxmem; 385 printf("\ndumping to dev (%d,%d), offset %ld\n", 386 major(dumpdev), minor(dumpdev), dumplo); 387 printf("dump "); 388 switch ((*bdevsw(dumpdev)->d_dump)(dumpdev)) { 389 390 case ENXIO: 391 printf("device bad\n"); 392 break; 393 394 case EFAULT: 395 printf("device not ready\n"); 396 break; 397 398 case EINVAL: 399 printf("area improper\n"); 400 break; 401 402 case EIO: 403 printf("i/o error\n"); 404 break; 405 406 case EINTR: 407 printf("aborted from console\n"); 408 break; 409 410 default: 411 printf("succeeded\n"); 412 break; 413 } 414 } 415 416 /* 417 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 418 * and then reboots. If we are called twice, then we avoid trying to sync 419 * the disks as this often leads to recursive panics. 420 */ 421 void 422 panic(const char *fmt, ...) 423 { 424 int bootopt; 425 va_list ap; 426 static char buf[256]; 427 428 bootopt = RB_AUTOBOOT | RB_DUMP; 429 if (panicstr) 430 bootopt |= RB_NOSYNC; 431 else 432 panicstr = fmt; 433 434 va_start(ap, fmt); 435 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 436 if (panicstr == fmt) 437 panicstr = buf; 438 va_end(ap); 439 printf("panic: %s\n", buf); 440 #ifdef SMP 441 /* three seperate prints in case of an unmapped page and trap */ 442 printf("mp_lock = %08x; ", mp_lock); 443 printf("cpuid = %d; ", cpuid); 444 printf("lapic.id = %08x\n", lapic.id); 445 #endif 446 447 #if defined(DDB) 448 if (debugger_on_panic) 449 Debugger ("panic"); 450 #endif 451 boot(bootopt); 452 } 453 454 /* 455 * Three routines to handle adding/deleting items on the 456 * shutdown callout lists 457 * 458 * at_shutdown(): 459 * Take the arguments given and put them onto the shutdown callout list. 460 * However first make sure that it's not already there. 461 * returns 0 on success. 462 */ 463 int 464 at_shutdown(bootlist_fn function, void *arg, int queue) 465 { 466 return(at_shutdown_pri(function, arg, queue, SHUTDOWN_PRI_DEFAULT)); 467 } 468 469 /* 470 * at_shutdown_pri(): 471 * Take the arguments given and put them onto the shutdown callout list 472 * with the given execution priority. 473 * returns 0 on success. 474 */ 475 int 476 at_shutdown_pri(bootlist_fn function, void *arg, int queue, int pri) 477 { 478 sle_p op, ep, ip; 479 480 if (queue < SHUTDOWN_PRE_SYNC 481 || queue > SHUTDOWN_FINAL) { 482 printf("at_shutdown: bad exit callout queue %d specified\n", 483 queue); 484 return (EINVAL); 485 } 486 if (rm_at_shutdown(function, arg)) 487 printf("at_shutdown: exit callout entry was already present\n"); 488 ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT); 489 if (ep == NULL) 490 return (ENOMEM); 491 ep->function = function; 492 ep->arg = arg; 493 ep->priority = pri; 494 495 /* Sort into list of items on this queue */ 496 ip = LIST_FIRST(&shutdown_lists[queue]); 497 if (ip == NULL) { 498 LIST_INSERT_HEAD(&shutdown_lists[queue], ep, links); 499 } else { 500 for (; ip != NULL; op = ip, ip = LIST_NEXT(ip, links)) { 501 if (ep->priority < ip->priority) { 502 LIST_INSERT_BEFORE(ip, ep, links); 503 ep = NULL; 504 break; 505 } 506 } 507 if (ep != NULL) 508 LIST_INSERT_AFTER(op, ep, links); 509 } 510 return (0); 511 } 512 513 /* 514 * Scan the exit callout lists for the given items and remove them. 515 * Returns the number of items removed. 516 */ 517 int 518 rm_at_shutdown(bootlist_fn function, void *arg) 519 { 520 sle_p ep; 521 int count; 522 int queue; 523 524 count = 0; 525 for (queue = SHUTDOWN_PRE_SYNC; queue < SHUTDOWN_FINAL; queue++) { 526 LIST_FOREACH(ep, &shutdown_lists[queue], links) { 527 if ((ep->function == function) && (ep->arg == arg)) { 528 LIST_REMOVE(ep, links); 529 free(ep, M_TEMP); 530 count++; 531 } 532 } 533 } 534 return (count); 535 } 536 537 /* 538 * Support for poweroff delay. 539 */ 540 static int poweroff_delay = 0; 541 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 542 &poweroff_delay, 0, ""); 543 544 static void poweroff_wait(int howto, void *unused) 545 { 546 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 547 return; 548 DELAY(poweroff_delay * 1000); 549 } 550 551 /* 552 * XXX OK? This implies I know SHUTDOWN_PRI_LAST > SHUTDOWN_PRI_FIRST 553 */ 554 static void poweroff_conf(void *unused) 555 { 556 at_shutdown_pri(poweroff_wait, NULL, SHUTDOWN_FINAL, SHUTDOWN_PRI_FIRST); 557 } 558 559 SYSINIT(poweroff_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, poweroff_conf, NULL) 560