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 * $FreeBSD: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon 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/eventhandler.h> 50 #include <sys/buf.h> 51 #include <sys/disklabel.h> 52 #include <sys/reboot.h> 53 #include <sys/proc.h> 54 #include <sys/vnode.h> 55 #include <sys/kernel.h> 56 #include <sys/kthread.h> 57 #include <sys/malloc.h> 58 #include <sys/mount.h> 59 #include <sys/queue.h> 60 #include <sys/sysctl.h> 61 #include <sys/conf.h> 62 #include <sys/sysproto.h> 63 #include <sys/cons.h> 64 65 #include <machine/pcb.h> 66 #include <machine/clock.h> 67 #include <machine/md_var.h> 68 #include <machine/smp.h> /* smp_active, cpuid */ 69 70 #include <sys/signalvar.h> 71 72 #ifndef PANIC_REBOOT_WAIT_TIME 73 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 74 #endif 75 76 /* 77 * Note that stdarg.h and the ANSI style va_start macro is used for both 78 * ANSI and traditional C compilers. 79 */ 80 #include <machine/stdarg.h> 81 82 #ifdef DDB 83 #ifdef DDB_UNATTENDED 84 int debugger_on_panic = 0; 85 #else 86 int debugger_on_panic = 1; 87 #endif 88 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 89 &debugger_on_panic, 0, "Run debugger on kernel panic"); 90 #endif 91 92 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 93 94 #ifdef HW_WDOG 95 /* 96 * If there is a hardware watchdog, point this at the function needed to 97 * hold it off. 98 * It's needed when the kernel needs to do some lengthy operations. 99 * e.g. in wd.c when dumping core.. It's most annoying to have 100 * your precious core-dump only half written because the wdog kicked in. 101 */ 102 watchdog_tickle_fn wdog_tickler = NULL; 103 #endif /* HW_WDOG */ 104 105 /* 106 * Variable panicstr contains argument to first call to panic; used as flag 107 * to indicate that the kernel has already called panic. 108 */ 109 const char *panicstr; 110 111 int dumping; /* system is dumping */ 112 113 static void boot __P((int)) __dead2; 114 static void dumpsys __P((void)); 115 static int setdumpdev __P((dev_t dev)); 116 static void poweroff_wait __P((void *, int)); 117 static void print_uptime __P((void)); 118 static void shutdown_halt __P((void *junk, int howto)); 119 static void shutdown_panic __P((void *junk, int howto)); 120 static void shutdown_reset __P((void *junk, int howto)); 121 122 /* register various local shutdown events */ 123 static void 124 shutdown_conf(void *unused) 125 { 126 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 127 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 128 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 129 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 130 } 131 132 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 133 134 /* ARGSUSED */ 135 136 /* 137 * The system call that results in a reboot 138 */ 139 int 140 reboot(p, uap) 141 struct proc *p; 142 struct reboot_args *uap; 143 { 144 int error; 145 146 if ((error = suser(p))) 147 return (error); 148 149 boot(uap->opt); 150 return (0); 151 } 152 153 /* 154 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 155 */ 156 static int shutdown_howto = 0; 157 158 void 159 shutdown_nice(int howto) 160 { 161 shutdown_howto = howto; 162 163 /* Send a signal to init(8) and have it shutdown the world */ 164 if (initproc != NULL) { 165 psignal(initproc, SIGINT); 166 } else { 167 /* No init(8) running, so simply reboot */ 168 boot(RB_NOSYNC); 169 } 170 return; 171 } 172 static int waittime = -1; 173 static struct pcb dumppcb; 174 175 static void 176 print_uptime() 177 { 178 int f; 179 struct timespec ts; 180 181 getnanouptime(&ts); 182 printf("Uptime: "); 183 f = 0; 184 if (ts.tv_sec >= 86400) { 185 printf("%ldd", ts.tv_sec / 86400); 186 ts.tv_sec %= 86400; 187 f = 1; 188 } 189 if (f || ts.tv_sec >= 3600) { 190 printf("%ldh", ts.tv_sec / 3600); 191 ts.tv_sec %= 3600; 192 f = 1; 193 } 194 if (f || ts.tv_sec >= 60) { 195 printf("%ldm", ts.tv_sec / 60); 196 ts.tv_sec %= 60; 197 f = 1; 198 } 199 printf("%lds\n", ts.tv_sec); 200 } 201 202 /* 203 * Go through the rigmarole of shutting down.. 204 * this used to be in machdep.c but I'll be dammned if I could see 205 * anything machine dependant in it. 206 */ 207 static void 208 boot(howto) 209 int howto; 210 { 211 212 /* collect extra flags that shutdown_nice might have set */ 213 howto |= shutdown_howto; 214 215 #ifdef SMP 216 if (smp_active) { 217 printf("boot() called on cpu#%d\n", cpuid); 218 } 219 #endif 220 /* 221 * Do any callouts that should be done BEFORE syncing the filesystems. 222 */ 223 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 224 225 /* 226 * Now sync filesystems 227 */ 228 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 229 register struct buf *bp; 230 int iter, nbusy, pbusy; 231 232 waittime = 0; 233 printf("\nsyncing disks... "); 234 235 sync(&proc0, NULL); 236 237 /* 238 * With soft updates, some buffers that are 239 * written will be remarked as dirty until other 240 * buffers are written. 241 */ 242 for (iter = pbusy = 0; iter < 20; iter++) { 243 nbusy = 0; 244 for (bp = &buf[nbuf]; --bp >= buf; ) { 245 if ((bp->b_flags & B_INVAL) == 0 && 246 BUF_REFCNT(bp) > 0) { 247 nbusy++; 248 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 249 == B_DELWRI) { 250 /* bawrite(bp);*/ 251 nbusy++; 252 } 253 } 254 if (nbusy == 0) 255 break; 256 printf("%d ", nbusy); 257 if (nbusy < pbusy) 258 iter = 0; 259 pbusy = nbusy; 260 if (iter > 5 && bioops.io_sync) 261 (*bioops.io_sync)(NULL); 262 sync(&proc0, NULL); 263 DELAY(50000 * iter); 264 } 265 printf("\n"); 266 /* 267 * Count only busy local buffers to prevent forcing 268 * a fsck if we're just a client of a wedged NFS server 269 */ 270 nbusy = 0; 271 for (bp = &buf[nbuf]; --bp >= buf; ) { 272 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 273 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 274 if (bp->b_dev == NODEV) { 275 TAILQ_REMOVE(&mountlist, 276 bp->b_vp->v_mount, mnt_list); 277 continue; 278 } 279 nbusy++; 280 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 281 printf( 282 "%p %d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", 283 bp, nbusy, devtoname(bp->b_dev), 284 bp->b_flags, (long)bp->b_blkno, 285 (long)bp->b_lblkno); 286 #endif 287 } 288 } 289 if (nbusy) { 290 /* 291 * Failed to sync all blocks. Indicate this and don't 292 * unmount filesystems (thus forcing an fsck on reboot). 293 */ 294 printf("giving up on %d buffers\n", nbusy); 295 DELAY(5000000); /* 5 seconds */ 296 } else { 297 printf("done\n"); 298 /* 299 * Unmount filesystems 300 */ 301 if (panicstr == 0) 302 vfs_unmountall(); 303 } 304 DELAY(100000); /* wait for console output to finish */ 305 } 306 307 print_uptime(); 308 309 /* 310 * Ok, now do things that assume all filesystem activity has 311 * been completed. 312 */ 313 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 314 splhigh(); 315 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 316 dumpsys(); 317 318 /* Now that we're going to really halt the system... */ 319 EVENTHANDLER_INVOKE(shutdown_final, howto); 320 321 for(;;) ; /* safety against shutdown_reset not working */ 322 /* NOTREACHED */ 323 } 324 325 /* 326 * If the shutdown was a clean halt, behave accordingly. 327 */ 328 static void 329 shutdown_halt(void *junk, int howto) 330 { 331 if (howto & RB_HALT) { 332 printf("\n"); 333 printf("The operating system has halted.\n"); 334 printf("Please press any key to reboot.\n\n"); 335 switch (cngetc()) { 336 case -1: /* No console, just die */ 337 cpu_halt(); 338 /* NOTREACHED */ 339 default: 340 howto &= ~RB_HALT; 341 break; 342 } 343 } 344 } 345 346 /* 347 * Check to see if the system paniced, pause and then reboot 348 * according to the specified delay. 349 */ 350 static void 351 shutdown_panic(void *junk, int howto) 352 { 353 int loop; 354 355 if (howto & RB_DUMP) { 356 if (PANIC_REBOOT_WAIT_TIME != 0) { 357 if (PANIC_REBOOT_WAIT_TIME != -1) { 358 printf("Automatic reboot in %d seconds - " 359 "press a key on the console to abort\n", 360 PANIC_REBOOT_WAIT_TIME); 361 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 362 loop > 0; --loop) { 363 DELAY(1000 * 100); /* 1/10th second */ 364 /* Did user type a key? */ 365 if (cncheckc() != -1) 366 break; 367 } 368 if (!loop) 369 return; 370 } 371 } else { /* zero time specified - reboot NOW */ 372 return; 373 } 374 printf("--> Press a key on the console to reboot,\n"); 375 printf("--> or switch off the system now.\n"); 376 cngetc(); 377 } 378 } 379 380 /* 381 * Everything done, now reset 382 */ 383 static void 384 shutdown_reset(void *junk, int howto) 385 { 386 printf("Rebooting...\n"); 387 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 388 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 389 cpu_reset(); 390 /* NOTREACHED */ /* assuming reset worked */ 391 } 392 393 /* 394 * Magic number for savecore 395 * 396 * exported (symorder) and used at least by savecore(8) 397 * 398 */ 399 static u_long const dumpmag = 0x8fca0101UL; 400 401 static int dumpsize = 0; /* also for savecore */ 402 403 static int dodump = 1; 404 405 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 406 "Try to perform coredump on kernel panic"); 407 408 static int 409 setdumpdev(dev) 410 dev_t dev; 411 { 412 int psize; 413 long newdumplo; 414 415 if (dev == NODEV) { 416 dumpdev = dev; 417 return (0); 418 } 419 if (devsw(dev) == NULL) 420 return (ENXIO); /* XXX is this right? */ 421 if (devsw(dev)->d_psize == NULL) 422 return (ENXIO); /* XXX should be ENODEV ? */ 423 psize = devsw(dev)->d_psize(dev); 424 if (psize == -1) 425 return (ENXIO); /* XXX should be ENODEV ? */ 426 /* 427 * XXX should clean up checking in dumpsys() to be more like this. 428 */ 429 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); 430 if (newdumplo <= LABELSECTOR) 431 return (ENOSPC); 432 dumpdev = dev; 433 dumplo = newdumplo; 434 return (0); 435 } 436 437 438 /* ARGSUSED */ 439 static void dump_conf __P((void *dummy)); 440 static void 441 dump_conf(dummy) 442 void *dummy; 443 { 444 char *path; 445 dev_t dev; 446 447 path = malloc(MNAMELEN, M_TEMP, M_WAITOK); 448 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { 449 dev = getdiskbyname(path); 450 if (dev != NODEV) 451 dumpdev = dev; 452 } 453 free(path, M_TEMP); 454 if (setdumpdev(dumpdev) != 0) 455 dumpdev = NODEV; 456 } 457 458 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 459 460 static int 461 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 462 { 463 int error; 464 udev_t ndumpdev; 465 466 ndumpdev = dev2udev(dumpdev); 467 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 468 if (error == 0 && req->newptr != NULL) 469 error = setdumpdev(udev2dev(ndumpdev, 0)); 470 return (error); 471 } 472 473 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 474 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 475 476 /* 477 * Doadump comes here after turning off memory management and 478 * getting on the dump stack, either when called above, or by 479 * the auto-restart code. 480 */ 481 static void 482 dumpsys(void) 483 { 484 int error; 485 486 savectx(&dumppcb); 487 if (dumping++) { 488 printf("Dump already in progress, bailing...\n"); 489 return; 490 } 491 if (!dodump) 492 return; 493 if (dumpdev == NODEV) 494 return; 495 if (!(devsw(dumpdev))) 496 return; 497 if (!(devsw(dumpdev)->d_dump)) 498 return; 499 dumpsize = Maxmem; 500 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 501 printf("dump "); 502 error = (*devsw(dumpdev)->d_dump)(dumpdev); 503 if (error == 0) { 504 printf("succeeded\n"); 505 return; 506 } 507 printf("failed, reason: "); 508 switch (error) { 509 case ENODEV: 510 printf("device doesn't support a dump routine\n"); 511 break; 512 513 case ENXIO: 514 printf("device bad\n"); 515 break; 516 517 case EFAULT: 518 printf("device not ready\n"); 519 break; 520 521 case EINVAL: 522 printf("area improper\n"); 523 break; 524 525 case EIO: 526 printf("i/o error\n"); 527 break; 528 529 case EINTR: 530 printf("aborted from console\n"); 531 break; 532 533 default: 534 printf("unknown, error = %d\n", error); 535 break; 536 } 537 } 538 539 int 540 dumpstatus(vm_offset_t addr, off_t count) 541 { 542 int c; 543 544 if (addr % (1024 * 1024) == 0) { 545 #ifdef HW_WDOG 546 if (wdog_tickler) 547 (*wdog_tickler)(); 548 #endif 549 printf("%ld ", (long)(count / (1024 * 1024))); 550 } 551 552 if ((c = cncheckc()) == 0x03) 553 return -1; 554 else if (c != -1) 555 printf("[CTRL-C to abort] "); 556 557 return 0; 558 } 559 560 /* 561 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 562 * and then reboots. If we are called twice, then we avoid trying to sync 563 * the disks as this often leads to recursive panics. 564 */ 565 void 566 panic(const char *fmt, ...) 567 { 568 int bootopt; 569 va_list ap; 570 static char buf[256]; 571 572 bootopt = RB_AUTOBOOT | RB_DUMP; 573 if (panicstr) 574 bootopt |= RB_NOSYNC; 575 else 576 panicstr = fmt; 577 578 va_start(ap, fmt); 579 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 580 if (panicstr == fmt) 581 panicstr = buf; 582 va_end(ap); 583 printf("panic: %s\n", buf); 584 #ifdef SMP 585 /* three seperate prints in case of an unmapped page and trap */ 586 printf("mp_lock = %08x; ", mp_lock); 587 printf("cpuid = %d; ", cpuid); 588 printf("lapic.id = %08x\n", lapic.id); 589 #endif 590 591 #if defined(DDB) 592 if (debugger_on_panic) 593 Debugger ("panic"); 594 #endif 595 boot(bootopt); 596 } 597 598 /* 599 * Support for poweroff delay. 600 */ 601 #ifndef POWEROFF_DELAY 602 # define POWEROFF_DELAY 5000 603 #endif 604 static int poweroff_delay = POWEROFF_DELAY; 605 606 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 607 &poweroff_delay, 0, ""); 608 609 static void 610 poweroff_wait(void *junk, int howto) 611 { 612 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 613 return; 614 DELAY(poweroff_delay * 1000); 615 } 616 617 /* 618 * Some system processes (e.g. syncer) need to be stopped at appropriate 619 * points in their main loops prior to a system shutdown, so that they 620 * won't interfere with the shutdown process (e.g. by holding a disk buf 621 * to cause sync to fail). For each of these system processes, register 622 * shutdown_kproc() as a handler for one of shutdown events. 623 */ 624 static int kproc_shutdown_wait = 60; 625 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 626 &kproc_shutdown_wait, 0, ""); 627 628 void 629 shutdown_kproc(void *arg, int howto) 630 { 631 struct proc *p; 632 int error; 633 634 if (panicstr) 635 return; 636 637 p = (struct proc *)arg; 638 printf("Waiting (max %d seconds) for system process `%s' to stop...", 639 kproc_shutdown_wait, p->p_comm); 640 error = suspend_kproc(p, kproc_shutdown_wait * hz); 641 642 if (error == EWOULDBLOCK) 643 printf("timed out\n"); 644 else 645 printf("stopped\n"); 646 } 647