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 * $FreeBSD$ 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/bio.h> 50 #include <sys/buf.h> 51 #include <sys/conf.h> 52 #include <sys/cons.h> 53 #include <sys/disklabel.h> 54 #include <sys/eventhandler.h> 55 #include <sys/kernel.h> 56 #include <sys/kthread.h> 57 #include <sys/mount.h> 58 #include <sys/proc.h> 59 #include <sys/reboot.h> 60 #include <sys/resourcevar.h> 61 #include <sys/smp.h> /* smp_active */ 62 #include <sys/sysctl.h> 63 #include <sys/sysproto.h> 64 #include <sys/vnode.h> 65 66 #include <machine/pcb.h> 67 #include <machine/md_var.h> 68 69 #include <sys/signalvar.h> 70 #ifdef DDB 71 #include <ddb/ddb.h> 72 #endif 73 74 #ifndef PANIC_REBOOT_WAIT_TIME 75 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 76 #endif 77 78 /* 79 * Note that stdarg.h and the ANSI style va_start macro is used for both 80 * ANSI and traditional C compilers. 81 */ 82 #include <machine/stdarg.h> 83 84 #ifdef DDB 85 #ifdef DDB_UNATTENDED 86 int debugger_on_panic = 0; 87 #else 88 int debugger_on_panic = 1; 89 #endif 90 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 91 &debugger_on_panic, 0, "Run debugger on kernel panic"); 92 #endif 93 94 int sync_on_panic = 1; 95 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, 96 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 97 98 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 99 100 #ifdef HW_WDOG 101 /* 102 * If there is a hardware watchdog, point this at the function needed to 103 * hold it off. 104 * It's needed when the kernel needs to do some lengthy operations. 105 * e.g. in wd.c when dumping core.. It's most annoying to have 106 * your precious core-dump only half written because the wdog kicked in. 107 */ 108 watchdog_tickle_fn wdog_tickler = NULL; 109 #endif /* HW_WDOG */ 110 111 /* 112 * Variable panicstr contains argument to first call to panic; used as flag 113 * to indicate that the kernel has already called panic. 114 */ 115 const char *panicstr; 116 117 int dumping; /* system is dumping */ 118 119 static void boot(int) __dead2; 120 static void dumpsys(void); 121 static void poweroff_wait(void *, int); 122 static void shutdown_halt(void *junk, int howto); 123 static void shutdown_panic(void *junk, int howto); 124 static void shutdown_reset(void *junk, int howto); 125 126 /* register various local shutdown events */ 127 static void 128 shutdown_conf(void *unused) 129 { 130 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 131 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 132 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 133 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 134 } 135 136 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 137 138 /* 139 * The system call that results in a reboot 140 * 141 * MPSAFE 142 */ 143 /* ARGSUSED */ 144 int 145 reboot(struct thread *td, struct reboot_args *uap) 146 { 147 int error; 148 149 mtx_lock(&Giant); 150 if ((error = suser_td(td)) == 0) 151 boot(uap->opt); 152 mtx_unlock(&Giant); 153 return (error); 154 } 155 156 /* 157 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 158 */ 159 static int shutdown_howto = 0; 160 161 void 162 shutdown_nice(int howto) 163 { 164 shutdown_howto = howto; 165 166 /* Send a signal to init(8) and have it shutdown the world */ 167 if (initproc != NULL) { 168 PROC_LOCK(initproc); 169 psignal(initproc, SIGINT); 170 PROC_UNLOCK(initproc); 171 } else { 172 /* No init(8) running, so simply reboot */ 173 boot(RB_NOSYNC); 174 } 175 return; 176 } 177 static int waittime = -1; 178 static struct pcb dumppcb; 179 180 static void 181 print_uptime(void) 182 { 183 int f; 184 struct timespec ts; 185 186 getnanouptime(&ts); 187 printf("Uptime: "); 188 f = 0; 189 if (ts.tv_sec >= 86400) { 190 printf("%ldd", (long)ts.tv_sec / 86400); 191 ts.tv_sec %= 86400; 192 f = 1; 193 } 194 if (f || ts.tv_sec >= 3600) { 195 printf("%ldh", (long)ts.tv_sec / 3600); 196 ts.tv_sec %= 3600; 197 f = 1; 198 } 199 if (f || ts.tv_sec >= 60) { 200 printf("%ldm", (long)ts.tv_sec / 60); 201 ts.tv_sec %= 60; 202 f = 1; 203 } 204 printf("%lds\n", (long)ts.tv_sec); 205 } 206 207 /* 208 * Go through the rigmarole of shutting down.. 209 * this used to be in machdep.c but I'll be dammned if I could see 210 * anything machine dependant in it. 211 */ 212 static void 213 boot(int howto) 214 { 215 216 /* collect extra flags that shutdown_nice might have set */ 217 howto |= shutdown_howto; 218 219 #ifdef DDB 220 /* We are out of the debugger now. */ 221 db_active = 0; 222 #endif 223 224 #ifdef SMP 225 if (smp_active) 226 printf("boot() called on cpu#%d\n", PCPU_GET(cpuid)); 227 #endif 228 /* 229 * Do any callouts that should be done BEFORE syncing the filesystems. 230 */ 231 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 232 233 /* 234 * Now sync filesystems 235 */ 236 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 237 register struct buf *bp; 238 int iter, nbusy, pbusy; 239 int subiter; 240 241 waittime = 0; 242 printf("\nsyncing disks... "); 243 244 sync(thread0, NULL); 245 246 /* 247 * With soft updates, some buffers that are 248 * written will be remarked as dirty until other 249 * buffers are written. 250 */ 251 for (iter = pbusy = 0; iter < 20; iter++) { 252 nbusy = 0; 253 for (bp = &buf[nbuf]; --bp >= buf; ) { 254 if ((bp->b_flags & B_INVAL) == 0 && 255 BUF_REFCNT(bp) > 0) { 256 nbusy++; 257 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 258 == B_DELWRI) { 259 /* bawrite(bp);*/ 260 nbusy++; 261 } 262 } 263 if (nbusy == 0) 264 break; 265 printf("%d ", nbusy); 266 if (nbusy < pbusy) 267 iter = 0; 268 pbusy = nbusy; 269 sync(thread0, NULL); 270 if (curthread != NULL) { 271 DROP_GIANT_NOSWITCH(); 272 for (subiter = 0; subiter < 50 * iter; subiter++) { 273 mtx_lock_spin(&sched_lock); 274 setrunqueue(curthread); 275 curthread->td_proc->p_stats->p_ru.ru_nvcsw++; 276 mi_switch(); /* Allow interrupt threads to run */ 277 mtx_unlock_spin(&sched_lock); 278 DELAY(1000); 279 } 280 PICKUP_GIANT(); 281 } else 282 DELAY(50000 * iter); 283 } 284 printf("\n"); 285 /* 286 * Count only busy local buffers to prevent forcing 287 * a fsck if we're just a client of a wedged NFS server 288 */ 289 nbusy = 0; 290 for (bp = &buf[nbuf]; --bp >= buf; ) { 291 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 292 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 293 if (bp->b_dev == NODEV) { 294 TAILQ_REMOVE(&mountlist, 295 bp->b_vp->v_mount, mnt_list); 296 continue; 297 } 298 nbusy++; 299 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 300 printf( 301 "%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", 302 nbusy, devtoname(bp->b_dev), 303 bp->b_flags, (long)bp->b_blkno, 304 (long)bp->b_lblkno); 305 #endif 306 } 307 } 308 if (nbusy) { 309 /* 310 * Failed to sync all blocks. Indicate this and don't 311 * unmount filesystems (thus forcing an fsck on reboot). 312 */ 313 printf("giving up on %d buffers\n", nbusy); 314 DELAY(5000000); /* 5 seconds */ 315 } else { 316 printf("done\n"); 317 /* 318 * Unmount filesystems 319 */ 320 if (panicstr == 0) 321 vfs_unmountall(); 322 } 323 DELAY(100000); /* wait for console output to finish */ 324 } 325 326 print_uptime(); 327 328 /* 329 * Ok, now do things that assume all filesystem activity has 330 * been completed. 331 */ 332 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 333 splhigh(); 334 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 335 dumpsys(); 336 337 /* Now that we're going to really halt the system... */ 338 EVENTHANDLER_INVOKE(shutdown_final, howto); 339 340 for(;;) ; /* safety against shutdown_reset not working */ 341 /* NOTREACHED */ 342 } 343 344 /* 345 * If the shutdown was a clean halt, behave accordingly. 346 */ 347 static void 348 shutdown_halt(void *junk, int howto) 349 { 350 if (howto & RB_HALT) { 351 printf("\n"); 352 printf("The operating system has halted.\n"); 353 printf("Please press any key to reboot.\n\n"); 354 switch (cngetc()) { 355 case -1: /* No console, just die */ 356 cpu_halt(); 357 /* NOTREACHED */ 358 default: 359 howto &= ~RB_HALT; 360 break; 361 } 362 } 363 } 364 365 /* 366 * Check to see if the system paniced, pause and then reboot 367 * according to the specified delay. 368 */ 369 static void 370 shutdown_panic(void *junk, int howto) 371 { 372 int loop; 373 374 if (howto & RB_DUMP) { 375 if (PANIC_REBOOT_WAIT_TIME != 0) { 376 if (PANIC_REBOOT_WAIT_TIME != -1) { 377 printf("Automatic reboot in %d seconds - " 378 "press a key on the console to abort\n", 379 PANIC_REBOOT_WAIT_TIME); 380 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 381 loop > 0; --loop) { 382 DELAY(1000 * 100); /* 1/10th second */ 383 /* Did user type a key? */ 384 if (cncheckc() != -1) 385 break; 386 } 387 if (!loop) 388 return; 389 } 390 } else { /* zero time specified - reboot NOW */ 391 return; 392 } 393 printf("--> Press a key on the console to reboot <--\n"); 394 cngetc(); 395 } 396 } 397 398 /* 399 * Everything done, now reset 400 */ 401 static void 402 shutdown_reset(void *junk, int howto) 403 { 404 printf("Rebooting...\n"); 405 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 406 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 407 cpu_reset(); 408 /* NOTREACHED */ /* assuming reset worked */ 409 } 410 411 /* 412 * Magic number for savecore 413 * 414 * exported (symorder) and used at least by savecore(8) 415 * 416 */ 417 static u_long const dumpmag = 0x8fca0101UL; 418 419 static int dumpsize = 0; /* also for savecore */ 420 421 static int dodump = 1; 422 423 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 424 "Try to perform coredump on kernel panic"); 425 426 static int 427 setdumpdev(dev_t dev) 428 { 429 int psize; 430 long newdumplo; 431 432 if (dev == NODEV) { 433 dumpdev = dev; 434 return (0); 435 } 436 if (devsw(dev) == NULL) 437 return (ENXIO); /* XXX is this right? */ 438 if (devsw(dev)->d_psize == NULL) 439 return (ENXIO); /* XXX should be ENODEV ? */ 440 psize = devsw(dev)->d_psize(dev); 441 if (psize == -1) 442 return (ENXIO); /* XXX should be ENODEV ? */ 443 /* 444 * XXX should clean up checking in dumpsys() to be more like this. 445 */ 446 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); 447 if (newdumplo <= LABELSECTOR) 448 return (ENOSPC); 449 dumpdev = dev; 450 dumplo = newdumplo; 451 return (0); 452 } 453 454 455 /* ARGSUSED */ 456 static void 457 dump_conf(void *dummy) 458 { 459 if (setdumpdev(dumpdev) != 0) 460 dumpdev = NODEV; 461 } 462 463 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 464 465 static int 466 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 467 { 468 int error; 469 udev_t ndumpdev; 470 471 ndumpdev = dev2udev(dumpdev); 472 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 473 if (error == 0 && req->newptr != NULL) 474 error = setdumpdev(udev2dev(ndumpdev, 0)); 475 return (error); 476 } 477 478 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 479 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 480 481 /* 482 * Doadump comes here after turning off memory management and 483 * getting on the dump stack, either when called above, or by 484 * the auto-restart code. 485 */ 486 static void 487 dumpsys(void) 488 { 489 int error; 490 491 savectx(&dumppcb); 492 if (!dodump) 493 return; 494 if (dumpdev == NODEV) 495 return; 496 if (!(devsw(dumpdev))) 497 return; 498 if (!(devsw(dumpdev)->d_dump)) 499 return; 500 if (dumping++) { 501 dumping--; 502 printf("Dump already in progress, bailing...\n"); 503 return; 504 } 505 dumpsize = Maxmem; 506 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 507 printf("dump "); 508 error = (*devsw(dumpdev)->d_dump)(dumpdev); 509 dumping--; 510 if (error == 0) { 511 printf("succeeded\n"); 512 return; 513 } 514 printf("failed, reason: "); 515 switch (error) { 516 case ENODEV: 517 printf("device doesn't support a dump routine\n"); 518 break; 519 520 case ENXIO: 521 printf("device bad\n"); 522 break; 523 524 case EFAULT: 525 printf("device not ready\n"); 526 break; 527 528 case EINVAL: 529 printf("area improper\n"); 530 break; 531 532 case EIO: 533 printf("i/o error\n"); 534 break; 535 536 case EINTR: 537 printf("aborted from console\n"); 538 break; 539 540 default: 541 printf("unknown, error = %d\n", error); 542 break; 543 } 544 } 545 546 int 547 dumpstatus(vm_offset_t addr, off_t count) 548 { 549 int c; 550 551 if (addr % (1024 * 1024) == 0) { 552 #ifdef HW_WDOG 553 if (wdog_tickler) 554 (*wdog_tickler)(); 555 #endif 556 printf("%ld ", (long)(count / (1024 * 1024))); 557 } 558 559 if ((c = cncheckc()) == 0x03) 560 return -1; 561 else if (c != -1) 562 printf("[CTRL-C to abort] "); 563 564 return 0; 565 } 566 567 #ifdef SMP 568 static u_int panic_cpu = NOCPU; 569 #endif 570 571 /* 572 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 573 * and then reboots. If we are called twice, then we avoid trying to sync 574 * the disks as this often leads to recursive panics. 575 * 576 * MPSAFE 577 */ 578 void 579 panic(const char *fmt, ...) 580 { 581 int bootopt; 582 va_list ap; 583 static char buf[256]; 584 585 #ifdef SMP 586 /* 587 * We don't want multiple CPU's to panic at the same time, so we 588 * use panic_cpu as a simple spinlock. We have to keep checking 589 * panic_cpu if we are spinning in case the panic on the first 590 * CPU is canceled. 591 */ 592 if (panic_cpu != PCPU_GET(cpuid)) 593 while (atomic_cmpset_int(&panic_cpu, NOCPU, 594 PCPU_GET(cpuid)) == 0) 595 while (panic_cpu != NOCPU) 596 ; /* nothing */ 597 #endif 598 599 bootopt = RB_AUTOBOOT | RB_DUMP; 600 if (panicstr) 601 bootopt |= RB_NOSYNC; 602 else 603 panicstr = fmt; 604 605 va_start(ap, fmt); 606 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 607 if (panicstr == fmt) 608 panicstr = buf; 609 va_end(ap); 610 printf("panic: %s\n", buf); 611 #ifdef SMP 612 /* two separate prints in case of an unmapped page and trap */ 613 printf("cpuid = %d; ", PCPU_GET(cpuid)); 614 #ifdef APIC_IO 615 printf("lapic.id = %08x\n", lapic.id); 616 #endif 617 #endif 618 619 #if defined(DDB) 620 if (debugger_on_panic) 621 Debugger ("panic"); 622 #ifdef RESTARTABLE_PANICS 623 /* See if the user aborted the panic, in which case we continue. */ 624 if (panicstr == NULL) { 625 #ifdef SMP 626 atomic_store_rel_int(&panic_cpu, NOCPU); 627 #endif 628 return; 629 } 630 #endif 631 #endif 632 if (!sync_on_panic) 633 bootopt |= RB_NOSYNC; 634 boot(bootopt); 635 } 636 637 /* 638 * Support for poweroff delay. 639 */ 640 #ifndef POWEROFF_DELAY 641 # define POWEROFF_DELAY 5000 642 #endif 643 static int poweroff_delay = POWEROFF_DELAY; 644 645 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 646 &poweroff_delay, 0, ""); 647 648 static void 649 poweroff_wait(void *junk, int howto) 650 { 651 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 652 return; 653 DELAY(poweroff_delay * 1000); 654 } 655 656 /* 657 * Some system processes (e.g. syncer) need to be stopped at appropriate 658 * points in their main loops prior to a system shutdown, so that they 659 * won't interfere with the shutdown process (e.g. by holding a disk buf 660 * to cause sync to fail). For each of these system processes, register 661 * shutdown_kproc() as a handler for one of shutdown events. 662 */ 663 static int kproc_shutdown_wait = 60; 664 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 665 &kproc_shutdown_wait, 0, ""); 666 667 void 668 kproc_shutdown(void *arg, int howto) 669 { 670 struct proc *p; 671 int error; 672 673 if (panicstr) 674 return; 675 676 p = (struct proc *)arg; 677 printf("Waiting (max %d seconds) for system process `%s' to stop...", 678 kproc_shutdown_wait, p->p_comm); 679 error = kthread_suspend(p, kproc_shutdown_wait * hz); 680 681 if (error == EWOULDBLOCK) 682 printf("timed out\n"); 683 else 684 printf("stopped\n"); 685 } 686