| 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 1.20 2005/06/16 17:55:06 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/thread2.h> |
| 68 | #include <sys/buf2.h> |
| 69 | |
| 70 | #include <machine/pcb.h> |
| 71 | #include <machine/clock.h> |
| 72 | #include <machine/md_var.h> |
| 73 | #include <machine/smp.h> /* smp_active_mask, cpuid */ |
| 74 | |
| 75 | #include <sys/signalvar.h> |
| 76 | |
| 77 | #ifndef PANIC_REBOOT_WAIT_TIME |
| 78 | #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ |
| 79 | #endif |
| 80 | |
| 81 | /* |
| 82 | * Note that stdarg.h and the ANSI style va_start macro is used for both |
| 83 | * ANSI and traditional C compilers. We use the machine version to stay |
| 84 | * within the confines of the kernel header files. |
| 85 | */ |
| 86 | #include <machine/stdarg.h> |
| 87 | |
| 88 | #ifdef DDB |
| 89 | #ifdef DDB_UNATTENDED |
| 90 | int debugger_on_panic = 0; |
| 91 | #else |
| 92 | int debugger_on_panic = 1; |
| 93 | #endif |
| 94 | SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, |
| 95 | &debugger_on_panic, 0, "Run debugger on kernel panic"); |
| 96 | |
| 97 | extern void db_print_backtrace(void); |
| 98 | |
| 99 | #ifdef DDB_TRACE |
| 100 | int trace_on_panic = 1; |
| 101 | #else |
| 102 | int trace_on_panic = 0; |
| 103 | #endif |
| 104 | SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, |
| 105 | &trace_on_panic, 0, "Print stack trace on kernel panic"); |
| 106 | #endif |
| 107 | |
| 108 | static int sync_on_panic = 1; |
| 109 | SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, |
| 110 | &sync_on_panic, 0, "Do a sync before rebooting from a panic"); |
| 111 | |
| 112 | SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); |
| 113 | |
| 114 | #ifdef HW_WDOG |
| 115 | /* |
| 116 | * If there is a hardware watchdog, point this at the function needed to |
| 117 | * hold it off. |
| 118 | * It's needed when the kernel needs to do some lengthy operations. |
| 119 | * e.g. in wd.c when dumping core.. It's most annoying to have |
| 120 | * your precious core-dump only half written because the wdog kicked in. |
| 121 | */ |
| 122 | watchdog_tickle_fn wdog_tickler = NULL; |
| 123 | #endif /* HW_WDOG */ |
| 124 | |
| 125 | /* |
| 126 | * Variable panicstr contains argument to first call to panic; used as flag |
| 127 | * to indicate that the kernel has already called panic. |
| 128 | */ |
| 129 | const char *panicstr; |
| 130 | |
| 131 | int dumping; /* system is dumping */ |
| 132 | |
| 133 | static void boot (int) __dead2; |
| 134 | static void dumpsys (void); |
| 135 | static int setdumpdev (dev_t dev); |
| 136 | static void poweroff_wait (void *, int); |
| 137 | static void print_uptime (void); |
| 138 | static void shutdown_halt (void *junk, int howto); |
| 139 | static void shutdown_panic (void *junk, int howto); |
| 140 | static void shutdown_reset (void *junk, int howto); |
| 141 | |
| 142 | /* register various local shutdown events */ |
| 143 | static void |
| 144 | shutdown_conf(void *unused) |
| 145 | { |
| 146 | EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); |
| 147 | EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); |
| 148 | EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); |
| 149 | EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); |
| 150 | } |
| 151 | |
| 152 | SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) |
| 153 | |
| 154 | /* ARGSUSED */ |
| 155 | |
| 156 | /* |
| 157 | * The system call that results in a reboot |
| 158 | */ |
| 159 | int |
| 160 | reboot(struct reboot_args *uap) |
| 161 | { |
| 162 | struct thread *td = curthread; |
| 163 | int error; |
| 164 | |
| 165 | if ((error = suser(td))) |
| 166 | return (error); |
| 167 | |
| 168 | boot(uap->opt); |
| 169 | return (0); |
| 170 | } |
| 171 | |
| 172 | /* |
| 173 | * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC |
| 174 | */ |
| 175 | static int shutdown_howto = 0; |
| 176 | |
| 177 | void |
| 178 | shutdown_nice(int howto) |
| 179 | { |
| 180 | shutdown_howto = howto; |
| 181 | |
| 182 | /* Send a signal to init(8) and have it shutdown the world */ |
| 183 | if (initproc != NULL) { |
| 184 | psignal(initproc, SIGINT); |
| 185 | } else { |
| 186 | /* No init(8) running, so simply reboot */ |
| 187 | boot(RB_NOSYNC); |
| 188 | } |
| 189 | return; |
| 190 | } |
| 191 | static int waittime = -1; |
| 192 | static struct pcb dumppcb; |
| 193 | |
| 194 | static void |
| 195 | print_uptime() |
| 196 | { |
| 197 | int f; |
| 198 | struct timespec ts; |
| 199 | |
| 200 | getnanouptime(&ts); |
| 201 | printf("Uptime: "); |
| 202 | f = 0; |
| 203 | if (ts.tv_sec >= 86400) { |
| 204 | printf("%ldd", ts.tv_sec / 86400); |
| 205 | ts.tv_sec %= 86400; |
| 206 | f = 1; |
| 207 | } |
| 208 | if (f || ts.tv_sec >= 3600) { |
| 209 | printf("%ldh", ts.tv_sec / 3600); |
| 210 | ts.tv_sec %= 3600; |
| 211 | f = 1; |
| 212 | } |
| 213 | if (f || ts.tv_sec >= 60) { |
| 214 | printf("%ldm", ts.tv_sec / 60); |
| 215 | ts.tv_sec %= 60; |
| 216 | f = 1; |
| 217 | } |
| 218 | printf("%lds\n", ts.tv_sec); |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * Go through the rigmarole of shutting down.. |
| 223 | * this used to be in machdep.c but I'll be dammned if I could see |
| 224 | * anything machine dependant in it. |
| 225 | */ |
| 226 | static void |
| 227 | boot(int howto) |
| 228 | { |
| 229 | |
| 230 | /* collect extra flags that shutdown_nice might have set */ |
| 231 | howto |= shutdown_howto; |
| 232 | |
| 233 | #ifdef SMP |
| 234 | if (smp_active_mask > 1) { |
| 235 | printf("boot() called on cpu#%d\n", mycpu->gd_cpuid); |
| 236 | } |
| 237 | #endif |
| 238 | /* |
| 239 | * Do any callouts that should be done BEFORE syncing the filesystems. |
| 240 | */ |
| 241 | EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); |
| 242 | |
| 243 | /* |
| 244 | * Now sync filesystems |
| 245 | */ |
| 246 | if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { |
| 247 | struct buf *bp; |
| 248 | int iter, nbusy, pbusy; |
| 249 | |
| 250 | waittime = 0; |
| 251 | printf("\nsyncing disks... "); |
| 252 | |
| 253 | sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ |
| 254 | |
| 255 | /* |
| 256 | * With soft updates, some buffers that are |
| 257 | * written will be remarked as dirty until other |
| 258 | * buffers are written. |
| 259 | */ |
| 260 | for (iter = pbusy = 0; iter < 20; iter++) { |
| 261 | nbusy = 0; |
| 262 | for (bp = &buf[nbuf]; --bp >= buf; ) { |
| 263 | if ((bp->b_flags & B_INVAL) == 0 && |
| 264 | BUF_REFCNT(bp) > 0) { |
| 265 | nbusy++; |
| 266 | } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) |
| 267 | == B_DELWRI) { |
| 268 | /* bawrite(bp);*/ |
| 269 | nbusy++; |
| 270 | } |
| 271 | } |
| 272 | if (nbusy == 0) |
| 273 | break; |
| 274 | printf("%d ", nbusy); |
| 275 | if (nbusy < pbusy) |
| 276 | iter = 0; |
| 277 | pbusy = nbusy; |
| 278 | /* |
| 279 | * XXX: |
| 280 | * Process soft update work queue if buffers don't sync |
| 281 | * after 6 iterations by permitting the syncer to run. |
| 282 | */ |
| 283 | if (iter > 5 && bioops.io_sync) |
| 284 | (*bioops.io_sync)(NULL); |
| 285 | sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ |
| 286 | DELAY(50000 * iter); |
| 287 | } |
| 288 | printf("\n"); |
| 289 | /* |
| 290 | * Count only busy local buffers to prevent forcing |
| 291 | * a fsck if we're just a client of a wedged NFS server |
| 292 | */ |
| 293 | nbusy = 0; |
| 294 | for (bp = &buf[nbuf]; --bp >= buf; ) { |
| 295 | if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || |
| 296 | ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { |
| 297 | if (bp->b_dev == NODEV) { |
| 298 | mountlist_remove(bp->b_vp->v_mount); |
| 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 | crit_enter(); |
| 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 | } |