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 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.18 2004/08/09 02:59:31 drhodus Exp $ 41 */ 42 43 #include "opt_ddb.h" 44 #include "opt_ddb_trace.h" 45 #include "opt_hw_wdog.h" 46 #include "opt_panic.h" 47 #include "opt_show_busybufs.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/eventhandler.h> 52 #include <sys/buf.h> 53 #include <sys/disklabel.h> 54 #include <sys/reboot.h> 55 #include <sys/proc.h> 56 #include <sys/vnode.h> 57 #include <sys/kernel.h> 58 #include <sys/kthread.h> 59 #include <sys/malloc.h> 60 #include <sys/mount.h> 61 #include <sys/queue.h> 62 #include <sys/sysctl.h> 63 #include <sys/conf.h> 64 #include <sys/sysproto.h> 65 #include <sys/device.h> 66 #include <sys/cons.h> 67 #include <sys/buf2.h> 68 69 #include <machine/pcb.h> 70 #include <machine/clock.h> 71 #include <machine/md_var.h> 72 #include <machine/smp.h> /* smp_active_mask, cpuid */ 73 74 #include <sys/signalvar.h> 75 76 #ifndef PANIC_REBOOT_WAIT_TIME 77 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 78 #endif 79 80 /* 81 * Note that stdarg.h and the ANSI style va_start macro is used for both 82 * ANSI and traditional C compilers. We use the machine version to stay 83 * within the confines of the kernel header files. 84 */ 85 #include <machine/stdarg.h> 86 87 #ifdef DDB 88 #ifdef DDB_UNATTENDED 89 int debugger_on_panic = 0; 90 #else 91 int debugger_on_panic = 1; 92 #endif 93 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 94 &debugger_on_panic, 0, "Run debugger on kernel panic"); 95 96 extern void db_print_backtrace(void); 97 98 #ifdef DDB_TRACE 99 int trace_on_panic = 1; 100 #else 101 int trace_on_panic = 0; 102 #endif 103 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, 104 &trace_on_panic, 0, "Print stack trace on kernel panic"); 105 #endif 106 107 static int sync_on_panic = 1; 108 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, 109 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 110 111 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 112 113 #ifdef HW_WDOG 114 /* 115 * If there is a hardware watchdog, point this at the function needed to 116 * hold it off. 117 * It's needed when the kernel needs to do some lengthy operations. 118 * e.g. in wd.c when dumping core.. It's most annoying to have 119 * your precious core-dump only half written because the wdog kicked in. 120 */ 121 watchdog_tickle_fn wdog_tickler = NULL; 122 #endif /* HW_WDOG */ 123 124 /* 125 * Variable panicstr contains argument to first call to panic; used as flag 126 * to indicate that the kernel has already called panic. 127 */ 128 const char *panicstr; 129 130 int dumping; /* system is dumping */ 131 132 static void boot (int) __dead2; 133 static void dumpsys (void); 134 static int setdumpdev (dev_t dev); 135 static void poweroff_wait (void *, int); 136 static void print_uptime (void); 137 static void shutdown_halt (void *junk, int howto); 138 static void shutdown_panic (void *junk, int howto); 139 static void shutdown_reset (void *junk, int howto); 140 141 /* register various local shutdown events */ 142 static void 143 shutdown_conf(void *unused) 144 { 145 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 146 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 147 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 148 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 149 } 150 151 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 152 153 /* ARGSUSED */ 154 155 /* 156 * The system call that results in a reboot 157 */ 158 int 159 reboot(struct reboot_args *uap) 160 { 161 struct thread *td = curthread; 162 int error; 163 164 if ((error = suser(td))) 165 return (error); 166 167 boot(uap->opt); 168 return (0); 169 } 170 171 /* 172 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 173 */ 174 static int shutdown_howto = 0; 175 176 void 177 shutdown_nice(int howto) 178 { 179 shutdown_howto = howto; 180 181 /* Send a signal to init(8) and have it shutdown the world */ 182 if (initproc != NULL) { 183 psignal(initproc, SIGINT); 184 } else { 185 /* No init(8) running, so simply reboot */ 186 boot(RB_NOSYNC); 187 } 188 return; 189 } 190 static int waittime = -1; 191 static struct pcb dumppcb; 192 193 static void 194 print_uptime() 195 { 196 int f; 197 struct timespec ts; 198 199 getnanouptime(&ts); 200 printf("Uptime: "); 201 f = 0; 202 if (ts.tv_sec >= 86400) { 203 printf("%ldd", ts.tv_sec / 86400); 204 ts.tv_sec %= 86400; 205 f = 1; 206 } 207 if (f || ts.tv_sec >= 3600) { 208 printf("%ldh", ts.tv_sec / 3600); 209 ts.tv_sec %= 3600; 210 f = 1; 211 } 212 if (f || ts.tv_sec >= 60) { 213 printf("%ldm", ts.tv_sec / 60); 214 ts.tv_sec %= 60; 215 f = 1; 216 } 217 printf("%lds\n", ts.tv_sec); 218 } 219 220 /* 221 * Go through the rigmarole of shutting down.. 222 * this used to be in machdep.c but I'll be dammned if I could see 223 * anything machine dependant in it. 224 */ 225 static void 226 boot(int howto) 227 { 228 229 /* collect extra flags that shutdown_nice might have set */ 230 howto |= shutdown_howto; 231 232 #ifdef SMP 233 if (smp_active_mask > 1) { 234 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid); 235 } 236 #endif 237 /* 238 * Do any callouts that should be done BEFORE syncing the filesystems. 239 */ 240 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 241 242 /* 243 * Now sync filesystems 244 */ 245 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 246 struct buf *bp; 247 int iter, nbusy, pbusy; 248 249 waittime = 0; 250 printf("\nsyncing disks... "); 251 252 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 253 254 /* 255 * With soft updates, some buffers that are 256 * written will be remarked as dirty until other 257 * buffers are written. 258 */ 259 for (iter = pbusy = 0; iter < 20; iter++) { 260 nbusy = 0; 261 for (bp = &buf[nbuf]; --bp >= buf; ) { 262 if ((bp->b_flags & B_INVAL) == 0 && 263 BUF_REFCNT(bp) > 0) { 264 nbusy++; 265 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 266 == B_DELWRI) { 267 /* bawrite(bp);*/ 268 nbusy++; 269 } 270 } 271 if (nbusy == 0) 272 break; 273 printf("%d ", nbusy); 274 if (nbusy < pbusy) 275 iter = 0; 276 pbusy = nbusy; 277 /* 278 * XXX: 279 * Process soft update work queue if buffers don't sync 280 * after 6 iterations by permitting the syncer to run. 281 */ 282 if (iter > 5 && bioops.io_sync) 283 (*bioops.io_sync)(NULL); 284 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 285 DELAY(50000 * iter); 286 } 287 printf("\n"); 288 /* 289 * Count only busy local buffers to prevent forcing 290 * a fsck if we're just a client of a wedged NFS server 291 */ 292 nbusy = 0; 293 for (bp = &buf[nbuf]; --bp >= buf; ) { 294 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 295 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 296 if (bp->b_dev == NODEV) { 297 TAILQ_REMOVE(&mountlist, 298 bp->b_vp->v_mount, mnt_list); 299 continue; 300 } 301 nbusy++; 302 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 303 printf( 304 "%p %d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", 305 bp, nbusy, devtoname(bp->b_dev), 306 bp->b_flags, (long)bp->b_blkno, 307 (long)bp->b_lblkno); 308 #endif 309 } 310 } 311 if (nbusy) { 312 /* 313 * Failed to sync all blocks. Indicate this and don't 314 * unmount filesystems (thus forcing an fsck on reboot). 315 */ 316 printf("giving up on %d buffers\n", nbusy); 317 #ifdef DDB 318 Debugger("busy buffer problem"); 319 #endif /* DDB */ 320 DELAY(5000000); /* 5 seconds */ 321 } else { 322 printf("done\n"); 323 /* 324 * Unmount filesystems 325 */ 326 if (panicstr == 0) 327 vfs_unmountall(); 328 } 329 DELAY(100000); /* wait for console output to finish */ 330 } 331 332 print_uptime(); 333 334 /* 335 * Ok, now do things that assume all filesystem activity has 336 * been completed. 337 */ 338 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 339 splhigh(); 340 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 341 dumpsys(); 342 343 /* Now that we're going to really halt the system... */ 344 EVENTHANDLER_INVOKE(shutdown_final, howto); 345 346 for(;;) ; /* safety against shutdown_reset not working */ 347 /* NOTREACHED */ 348 } 349 350 /* 351 * If the shutdown was a clean halt, behave accordingly. 352 */ 353 static void 354 shutdown_halt(void *junk, int howto) 355 { 356 if (howto & RB_HALT) { 357 printf("\n"); 358 printf("The operating system has halted.\n"); 359 printf("Please press any key to reboot.\n\n"); 360 switch (cngetc()) { 361 case -1: /* No console, just die */ 362 cpu_halt(); 363 /* NOTREACHED */ 364 default: 365 howto &= ~RB_HALT; 366 break; 367 } 368 } 369 } 370 371 /* 372 * Check to see if the system paniced, pause and then reboot 373 * according to the specified delay. 374 */ 375 static void 376 shutdown_panic(void *junk, int howto) 377 { 378 int loop; 379 380 if (howto & RB_DUMP) { 381 if (PANIC_REBOOT_WAIT_TIME != 0) { 382 if (PANIC_REBOOT_WAIT_TIME != -1) { 383 printf("Automatic reboot in %d seconds - " 384 "press a key on the console to abort\n", 385 PANIC_REBOOT_WAIT_TIME); 386 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 387 loop > 0; --loop) { 388 DELAY(1000 * 100); /* 1/10th second */ 389 /* Did user type a key? */ 390 if (cncheckc() != -1) 391 break; 392 } 393 if (!loop) 394 return; 395 } 396 } else { /* zero time specified - reboot NOW */ 397 return; 398 } 399 printf("--> Press a key on the console to reboot,\n"); 400 printf("--> or switch off the system now.\n"); 401 cngetc(); 402 } 403 } 404 405 /* 406 * Everything done, now reset 407 */ 408 static void 409 shutdown_reset(void *junk, int howto) 410 { 411 printf("Rebooting...\n"); 412 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 413 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 414 cpu_reset(); 415 /* NOTREACHED */ /* assuming reset worked */ 416 } 417 418 /* 419 * Magic number for savecore 420 * 421 * exported (symorder) and used at least by savecore(8) 422 * 423 */ 424 static u_long const dumpmag = 0x8fca0101UL; 425 426 static int dumpsize = 0; /* also for savecore */ 427 428 static int dodump = 1; 429 430 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 431 "Try to perform coredump on kernel panic"); 432 433 static int 434 setdumpdev(dev) 435 dev_t dev; 436 { 437 int psize; 438 long newdumplo; 439 440 if (dev == NODEV) { 441 dumpdev = dev; 442 return (0); 443 } 444 psize = dev_dpsize(dev); 445 if (psize == -1) 446 return (ENXIO); 447 /* 448 * XXX should clean up checking in dumpsys() to be more like this. 449 */ 450 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); 451 if (newdumplo <= LABELSECTOR) 452 return (ENOSPC); 453 dumpdev = dev; 454 dumplo = newdumplo; 455 return (0); 456 } 457 458 459 /* ARGSUSED */ 460 static void dump_conf (void *dummy); 461 static void 462 dump_conf(dummy) 463 void *dummy; 464 { 465 char *path; 466 dev_t dev; 467 468 path = malloc(MNAMELEN, M_TEMP, M_WAITOK); 469 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { 470 dev = getdiskbyname(path); 471 if (dev != NODEV) 472 dumpdev = dev; 473 } 474 free(path, M_TEMP); 475 if (setdumpdev(dumpdev) != 0) 476 dumpdev = NODEV; 477 } 478 479 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 480 481 static int 482 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 483 { 484 int error; 485 udev_t ndumpdev; 486 487 ndumpdev = dev2udev(dumpdev); 488 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 489 if (error == 0 && req->newptr != NULL) 490 error = setdumpdev(udev2dev(ndumpdev, 0)); 491 return (error); 492 } 493 494 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 495 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 496 497 /* 498 * Doadump comes here after turning off memory management and 499 * getting on the dump stack, either when called above, or by 500 * the auto-restart code. 501 */ 502 static void 503 dumpsys(void) 504 { 505 int error; 506 507 savectx(&dumppcb); 508 if (dumping++) { 509 printf("Dump already in progress, bailing...\n"); 510 return; 511 } 512 if (!dodump) 513 return; 514 if (dumpdev == NODEV) 515 return; 516 dumpsize = Maxmem; 517 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 518 printf("dump "); 519 error = dev_ddump(dumpdev); 520 if (error == 0) { 521 printf("succeeded\n"); 522 return; 523 } 524 printf("failed, reason: "); 525 switch (error) { 526 case ENOSYS: 527 case ENODEV: 528 printf("device doesn't support a dump routine\n"); 529 break; 530 531 case ENXIO: 532 printf("device bad\n"); 533 break; 534 535 case EFAULT: 536 printf("device not ready\n"); 537 break; 538 539 case EINVAL: 540 printf("area improper\n"); 541 break; 542 543 case EIO: 544 printf("i/o error\n"); 545 break; 546 547 case EINTR: 548 printf("aborted from console\n"); 549 break; 550 551 default: 552 printf("unknown, error = %d\n", error); 553 break; 554 } 555 } 556 557 int 558 dumpstatus(vm_offset_t addr, off_t count) 559 { 560 int c; 561 562 if (addr % (1024 * 1024) == 0) { 563 #ifdef HW_WDOG 564 if (wdog_tickler) 565 (*wdog_tickler)(); 566 #endif 567 printf("%ld ", (long)(count / (1024 * 1024))); 568 } 569 570 if ((c = cncheckc()) == 0x03) 571 return -1; 572 else if (c != -1) 573 printf("[CTRL-C to abort] "); 574 575 return 0; 576 } 577 578 /* 579 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 580 * and then reboots. If we are called twice, then we avoid trying to sync 581 * the disks as this often leads to recursive panics. 582 */ 583 void 584 panic(const char *fmt, ...) 585 { 586 int bootopt, newpanic; 587 __va_list ap; 588 static char buf[256]; 589 590 bootopt = RB_AUTOBOOT | RB_DUMP; 591 if (sync_on_panic == 0) 592 bootopt |= RB_NOSYNC; 593 newpanic = 0; 594 if (panicstr) 595 bootopt |= RB_NOSYNC; 596 else { 597 panicstr = fmt; 598 newpanic = 1; 599 } 600 601 __va_start(ap, fmt); 602 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 603 if (panicstr == fmt) 604 panicstr = buf; 605 __va_end(ap); 606 printf("panic: %s\n", buf); 607 #ifdef SMP 608 /* three separate prints in case of an unmapped page and trap */ 609 printf("mp_lock = %08x; ", mp_lock); 610 printf("cpuid = %d; ", mycpu->gd_cpuid); 611 printf("lapic.id = %08x\n", lapic.id); 612 #endif 613 614 #if defined(DDB) 615 if (newpanic && trace_on_panic) 616 db_print_backtrace(); 617 if (debugger_on_panic) 618 Debugger ("panic"); 619 #endif 620 boot(bootopt); 621 } 622 623 /* 624 * Support for poweroff delay. 625 */ 626 #ifndef POWEROFF_DELAY 627 # define POWEROFF_DELAY 5000 628 #endif 629 static int poweroff_delay = POWEROFF_DELAY; 630 631 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 632 &poweroff_delay, 0, ""); 633 634 static void 635 poweroff_wait(void *junk, int howto) 636 { 637 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 638 return; 639 DELAY(poweroff_delay * 1000); 640 } 641 642 /* 643 * Some system processes (e.g. syncer) need to be stopped at appropriate 644 * points in their main loops prior to a system shutdown, so that they 645 * won't interfere with the shutdown process (e.g. by holding a disk buf 646 * to cause sync to fail). For each of these system processes, register 647 * shutdown_kproc() as a handler for one of shutdown events. 648 */ 649 static int kproc_shutdown_wait = 60; 650 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 651 &kproc_shutdown_wait, 0, ""); 652 653 void 654 shutdown_kproc(void *arg, int howto) 655 { 656 struct thread *td; 657 struct proc *p; 658 int error; 659 660 if (panicstr) 661 return; 662 663 td = (struct thread *)arg; 664 if ((p = td->td_proc) != NULL) { 665 printf("Waiting (max %d seconds) for system process `%s' to stop...", 666 kproc_shutdown_wait, p->p_comm); 667 } else { 668 printf("Waiting (max %d seconds) for system thread %s to stop...", 669 kproc_shutdown_wait, td->td_comm); 670 } 671 error = suspend_kproc(td, kproc_shutdown_wait * hz); 672 673 if (error == EWOULDBLOCK) 674 printf("timed out\n"); 675 else 676 printf("stopped\n"); 677 } 678