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 1.13 2003/11/09 02:22:36 dillon 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, 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 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 108 109 #ifdef HW_WDOG 110 /* 111 * If there is a hardware watchdog, point this at the function needed to 112 * hold it off. 113 * It's needed when the kernel needs to do some lengthy operations. 114 * e.g. in wd.c when dumping core.. It's most annoying to have 115 * your precious core-dump only half written because the wdog kicked in. 116 */ 117 watchdog_tickle_fn wdog_tickler = NULL; 118 #endif /* HW_WDOG */ 119 120 /* 121 * Variable panicstr contains argument to first call to panic; used as flag 122 * to indicate that the kernel has already called panic. 123 */ 124 const char *panicstr; 125 126 int dumping; /* system is dumping */ 127 128 static void boot (int) __dead2; 129 static void dumpsys (void); 130 static int setdumpdev (dev_t dev); 131 static void poweroff_wait (void *, int); 132 static void print_uptime (void); 133 static void shutdown_halt (void *junk, int howto); 134 static void shutdown_panic (void *junk, int howto); 135 static void shutdown_reset (void *junk, int howto); 136 137 /* register various local shutdown events */ 138 static void 139 shutdown_conf(void *unused) 140 { 141 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 142 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 143 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 144 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 145 } 146 147 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 148 149 /* ARGSUSED */ 150 151 /* 152 * The system call that results in a reboot 153 */ 154 int 155 reboot(struct reboot_args *uap) 156 { 157 struct thread *td = curthread; 158 int error; 159 160 if ((error = suser(td))) 161 return (error); 162 163 boot(uap->opt); 164 return (0); 165 } 166 167 /* 168 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 169 */ 170 static int shutdown_howto = 0; 171 172 void 173 shutdown_nice(int howto) 174 { 175 shutdown_howto = howto; 176 177 /* Send a signal to init(8) and have it shutdown the world */ 178 if (initproc != NULL) { 179 psignal(initproc, SIGINT); 180 } else { 181 /* No init(8) running, so simply reboot */ 182 boot(RB_NOSYNC); 183 } 184 return; 185 } 186 static int waittime = -1; 187 static struct pcb dumppcb; 188 189 static void 190 print_uptime() 191 { 192 int f; 193 struct timespec ts; 194 195 getnanouptime(&ts); 196 printf("Uptime: "); 197 f = 0; 198 if (ts.tv_sec >= 86400) { 199 printf("%ldd", ts.tv_sec / 86400); 200 ts.tv_sec %= 86400; 201 f = 1; 202 } 203 if (f || ts.tv_sec >= 3600) { 204 printf("%ldh", ts.tv_sec / 3600); 205 ts.tv_sec %= 3600; 206 f = 1; 207 } 208 if (f || ts.tv_sec >= 60) { 209 printf("%ldm", ts.tv_sec / 60); 210 ts.tv_sec %= 60; 211 f = 1; 212 } 213 printf("%lds\n", ts.tv_sec); 214 } 215 216 /* 217 * Go through the rigmarole of shutting down.. 218 * this used to be in machdep.c but I'll be dammned if I could see 219 * anything machine dependant in it. 220 */ 221 static void 222 boot(int howto) 223 { 224 225 /* collect extra flags that shutdown_nice might have set */ 226 howto |= shutdown_howto; 227 228 #ifdef SMP 229 if (smp_active) { 230 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid); 231 } 232 #endif 233 /* 234 * Do any callouts that should be done BEFORE syncing the filesystems. 235 */ 236 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 237 238 /* 239 * Now sync filesystems 240 */ 241 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 242 struct buf *bp; 243 int iter, nbusy, pbusy; 244 245 waittime = 0; 246 printf("\nsyncing disks... "); 247 248 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 249 250 /* 251 * With soft updates, some buffers that are 252 * written will be remarked as dirty until other 253 * buffers are written. 254 */ 255 for (iter = pbusy = 0; iter < 20; iter++) { 256 nbusy = 0; 257 for (bp = &buf[nbuf]; --bp >= buf; ) { 258 if ((bp->b_flags & B_INVAL) == 0 && 259 BUF_REFCNT(bp) > 0) { 260 nbusy++; 261 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 262 == B_DELWRI) { 263 /* bawrite(bp);*/ 264 nbusy++; 265 } 266 } 267 if (nbusy == 0) 268 break; 269 printf("%d ", nbusy); 270 if (nbusy < pbusy) 271 iter = 0; 272 pbusy = nbusy; 273 if (iter > 5 && bioops.io_sync) 274 (*bioops.io_sync)(NULL); 275 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 276 DELAY(50000 * iter); 277 } 278 printf("\n"); 279 /* 280 * Count only busy local buffers to prevent forcing 281 * a fsck if we're just a client of a wedged NFS server 282 */ 283 nbusy = 0; 284 for (bp = &buf[nbuf]; --bp >= buf; ) { 285 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 286 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 287 if (bp->b_dev == NODEV) { 288 TAILQ_REMOVE(&mountlist, 289 bp->b_vp->v_mount, mnt_list); 290 continue; 291 } 292 nbusy++; 293 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 294 printf( 295 "%p %d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", 296 bp, nbusy, devtoname(bp->b_dev), 297 bp->b_flags, (long)bp->b_blkno, 298 (long)bp->b_lblkno); 299 #endif 300 } 301 } 302 if (nbusy) { 303 /* 304 * Failed to sync all blocks. Indicate this and don't 305 * unmount filesystems (thus forcing an fsck on reboot). 306 */ 307 printf("giving up on %d buffers\n", nbusy); 308 DELAY(5000000); /* 5 seconds */ 309 } else { 310 printf("done\n"); 311 /* 312 * Unmount filesystems 313 */ 314 if (panicstr == 0) 315 vfs_unmountall(); 316 } 317 DELAY(100000); /* wait for console output to finish */ 318 } 319 320 print_uptime(); 321 322 /* 323 * Ok, now do things that assume all filesystem activity has 324 * been completed. 325 */ 326 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 327 splhigh(); 328 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 329 dumpsys(); 330 331 /* Now that we're going to really halt the system... */ 332 EVENTHANDLER_INVOKE(shutdown_final, howto); 333 334 for(;;) ; /* safety against shutdown_reset not working */ 335 /* NOTREACHED */ 336 } 337 338 /* 339 * If the shutdown was a clean halt, behave accordingly. 340 */ 341 static void 342 shutdown_halt(void *junk, int howto) 343 { 344 if (howto & RB_HALT) { 345 printf("\n"); 346 printf("The operating system has halted.\n"); 347 printf("Please press any key to reboot.\n\n"); 348 switch (cngetc()) { 349 case -1: /* No console, just die */ 350 cpu_halt(); 351 /* NOTREACHED */ 352 default: 353 howto &= ~RB_HALT; 354 break; 355 } 356 } 357 } 358 359 /* 360 * Check to see if the system paniced, pause and then reboot 361 * according to the specified delay. 362 */ 363 static void 364 shutdown_panic(void *junk, int howto) 365 { 366 int loop; 367 368 if (howto & RB_DUMP) { 369 if (PANIC_REBOOT_WAIT_TIME != 0) { 370 if (PANIC_REBOOT_WAIT_TIME != -1) { 371 printf("Automatic reboot in %d seconds - " 372 "press a key on the console to abort\n", 373 PANIC_REBOOT_WAIT_TIME); 374 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 375 loop > 0; --loop) { 376 DELAY(1000 * 100); /* 1/10th second */ 377 /* Did user type a key? */ 378 if (cncheckc() != -1) 379 break; 380 } 381 if (!loop) 382 return; 383 } 384 } else { /* zero time specified - reboot NOW */ 385 return; 386 } 387 printf("--> Press a key on the console to reboot,\n"); 388 printf("--> or switch off the system now.\n"); 389 cngetc(); 390 } 391 } 392 393 /* 394 * Everything done, now reset 395 */ 396 static void 397 shutdown_reset(void *junk, int howto) 398 { 399 printf("Rebooting...\n"); 400 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 401 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 402 cpu_reset(); 403 /* NOTREACHED */ /* assuming reset worked */ 404 } 405 406 /* 407 * Magic number for savecore 408 * 409 * exported (symorder) and used at least by savecore(8) 410 * 411 */ 412 static u_long const dumpmag = 0x8fca0101UL; 413 414 static int dumpsize = 0; /* also for savecore */ 415 416 static int dodump = 1; 417 418 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 419 "Try to perform coredump on kernel panic"); 420 421 static int 422 setdumpdev(dev) 423 dev_t dev; 424 { 425 int psize; 426 long newdumplo; 427 428 if (dev == NODEV) { 429 dumpdev = dev; 430 return (0); 431 } 432 psize = dev_dpsize(dev); 433 if (psize == -1) 434 return (ENXIO); 435 /* 436 * XXX should clean up checking in dumpsys() to be more like this. 437 */ 438 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); 439 if (newdumplo <= LABELSECTOR) 440 return (ENOSPC); 441 dumpdev = dev; 442 dumplo = newdumplo; 443 return (0); 444 } 445 446 447 /* ARGSUSED */ 448 static void dump_conf (void *dummy); 449 static void 450 dump_conf(dummy) 451 void *dummy; 452 { 453 char *path; 454 dev_t dev; 455 456 path = malloc(MNAMELEN, M_TEMP, M_WAITOK); 457 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { 458 dev = getdiskbyname(path); 459 if (dev != NODEV) 460 dumpdev = dev; 461 } 462 free(path, M_TEMP); 463 if (setdumpdev(dumpdev) != 0) 464 dumpdev = NODEV; 465 } 466 467 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 468 469 static int 470 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 471 { 472 int error; 473 udev_t ndumpdev; 474 475 ndumpdev = dev2udev(dumpdev); 476 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 477 if (error == 0 && req->newptr != NULL) 478 error = setdumpdev(udev2dev(ndumpdev, 0)); 479 return (error); 480 } 481 482 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 483 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 484 485 /* 486 * Doadump comes here after turning off memory management and 487 * getting on the dump stack, either when called above, or by 488 * the auto-restart code. 489 */ 490 static void 491 dumpsys(void) 492 { 493 int error; 494 495 savectx(&dumppcb); 496 if (dumping++) { 497 printf("Dump already in progress, bailing...\n"); 498 return; 499 } 500 if (!dodump) 501 return; 502 if (dumpdev == NODEV) 503 return; 504 dumpsize = Maxmem; 505 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 506 printf("dump "); 507 error = dev_ddump(dumpdev); 508 if (error == 0) { 509 printf("succeeded\n"); 510 return; 511 } 512 printf("failed, reason: "); 513 switch (error) { 514 case ENOSYS: 515 case ENODEV: 516 printf("device doesn't support a dump routine\n"); 517 break; 518 519 case ENXIO: 520 printf("device bad\n"); 521 break; 522 523 case EFAULT: 524 printf("device not ready\n"); 525 break; 526 527 case EINVAL: 528 printf("area improper\n"); 529 break; 530 531 case EIO: 532 printf("i/o error\n"); 533 break; 534 535 case EINTR: 536 printf("aborted from console\n"); 537 break; 538 539 default: 540 printf("unknown, error = %d\n", error); 541 break; 542 } 543 } 544 545 int 546 dumpstatus(vm_offset_t addr, off_t count) 547 { 548 int c; 549 550 if (addr % (1024 * 1024) == 0) { 551 #ifdef HW_WDOG 552 if (wdog_tickler) 553 (*wdog_tickler)(); 554 #endif 555 printf("%ld ", (long)(count / (1024 * 1024))); 556 } 557 558 if ((c = cncheckc()) == 0x03) 559 return -1; 560 else if (c != -1) 561 printf("[CTRL-C to abort] "); 562 563 return 0; 564 } 565 566 /* 567 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 568 * and then reboots. If we are called twice, then we avoid trying to sync 569 * the disks as this often leads to recursive panics. 570 */ 571 void 572 panic(const char *fmt, ...) 573 { 574 int bootopt, newpanic; 575 __va_list ap; 576 static char buf[256]; 577 578 bootopt = RB_AUTOBOOT | RB_DUMP; 579 newpanic = 0; 580 if (panicstr) 581 bootopt |= RB_NOSYNC; 582 else { 583 panicstr = fmt; 584 newpanic = 1; 585 } 586 587 __va_start(ap, fmt); 588 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 589 if (panicstr == fmt) 590 panicstr = buf; 591 __va_end(ap); 592 printf("panic: %s\n", buf); 593 #ifdef SMP 594 /* three seperate prints in case of an unmapped page and trap */ 595 printf("mp_lock = %08x; ", mp_lock); 596 printf("cpuid = %d; ", mycpu->gd_cpuid); 597 printf("lapic.id = %08x\n", lapic.id); 598 #endif 599 600 #if defined(DDB) 601 if (newpanic && trace_on_panic) 602 db_print_backtrace(); 603 if (debugger_on_panic) 604 Debugger ("panic"); 605 #endif 606 boot(bootopt); 607 } 608 609 /* 610 * Support for poweroff delay. 611 */ 612 #ifndef POWEROFF_DELAY 613 # define POWEROFF_DELAY 5000 614 #endif 615 static int poweroff_delay = POWEROFF_DELAY; 616 617 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 618 &poweroff_delay, 0, ""); 619 620 static void 621 poweroff_wait(void *junk, int howto) 622 { 623 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 624 return; 625 DELAY(poweroff_delay * 1000); 626 } 627 628 /* 629 * Some system processes (e.g. syncer) need to be stopped at appropriate 630 * points in their main loops prior to a system shutdown, so that they 631 * won't interfere with the shutdown process (e.g. by holding a disk buf 632 * to cause sync to fail). For each of these system processes, register 633 * shutdown_kproc() as a handler for one of shutdown events. 634 */ 635 static int kproc_shutdown_wait = 60; 636 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 637 &kproc_shutdown_wait, 0, ""); 638 639 void 640 shutdown_kproc(void *arg, int howto) 641 { 642 struct thread *td; 643 struct proc *p; 644 int error; 645 646 if (panicstr) 647 return; 648 649 td = (struct thread *)arg; 650 if ((p = td->td_proc) != NULL) { 651 printf("Waiting (max %d seconds) for system process `%s' to stop...", 652 kproc_shutdown_wait, p->p_comm); 653 } else { 654 printf("Waiting (max %d seconds) for system thread %s to stop...", 655 kproc_shutdown_wait, td->td_comm); 656 } 657 error = suspend_kproc(td, kproc_shutdown_wait * hz); 658 659 if (error == EWOULDBLOCK) 660 printf("timed out\n"); 661 else 662 printf("stopped\n"); 663 } 664