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/eventhandler.h> 50 #include <sys/buf.h> 51 #include <sys/reboot.h> 52 #include <sys/proc.h> 53 #include <sys/vnode.h> 54 #include <sys/kernel.h> 55 #include <sys/mount.h> 56 #include <sys/queue.h> 57 #include <sys/sysctl.h> 58 #include <sys/conf.h> 59 #include <sys/sysproto.h> 60 #include <sys/cons.h> 61 62 #include <machine/pcb.h> 63 #include <machine/clock.h> 64 #include <machine/md_var.h> 65 #ifdef SMP 66 #include <machine/smp.h> /* smp_active, cpuid */ 67 #endif 68 69 #include <sys/signalvar.h> 70 71 #ifndef PANIC_REBOOT_WAIT_TIME 72 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 73 #endif 74 75 /* 76 * Note that stdarg.h and the ANSI style va_start macro is used for both 77 * ANSI and traditional C compilers. 78 */ 79 #include <machine/stdarg.h> 80 81 #ifdef DDB 82 #ifdef DDB_UNATTENDED 83 int debugger_on_panic = 0; 84 #else 85 int debugger_on_panic = 1; 86 #endif 87 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 88 &debugger_on_panic, 0, "Run debugger on kernel panic"); 89 #endif 90 91 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 92 93 #ifdef HW_WDOG 94 /* 95 * If there is a hardware watchdog, point this at the function needed to 96 * hold it off. 97 * It's needed when the kernel needs to do some lengthy operations. 98 * e.g. in wd.c when dumping core.. It's most annoying to have 99 * your precious core-dump only half written because the wdog kicked in. 100 */ 101 watchdog_tickle_fn wdog_tickler = NULL; 102 #endif /* HW_WDOG */ 103 104 /* 105 * Variable panicstr contains argument to first call to panic; used as flag 106 * to indicate that the kernel has already called panic. 107 */ 108 const char *panicstr; 109 110 static void boot __P((int)) __dead2; 111 static void dumpsys __P((void)); 112 static int setdumpdev __P((dev_t dev)); 113 static void poweroff_wait __P((void *, int)); 114 static void shutdown_halt __P((void *junk, int howto)); 115 static void shutdown_panic __P((void *junk, int howto)); 116 static void shutdown_reset __P((void *junk, int howto)); 117 118 /* register various local shutdown events */ 119 static void 120 shutdown_conf(void *unused) 121 { 122 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 123 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 124 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 125 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 126 } 127 128 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 129 130 /* ARGSUSED */ 131 132 /* 133 * The system call that results in a reboot 134 */ 135 int 136 reboot(p, uap) 137 struct proc *p; 138 struct reboot_args *uap; 139 { 140 int error; 141 142 if ((error = suser(p))) 143 return (error); 144 145 boot(uap->opt); 146 return (0); 147 } 148 149 /* 150 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 151 */ 152 void 153 shutdown_nice() 154 { 155 /* Send a signal to init(8) and have it shutdown the world */ 156 if (initproc != NULL) { 157 psignal(initproc, SIGINT); 158 } else { 159 /* No init(8) running, so simply reboot */ 160 boot(RB_NOSYNC); 161 } 162 return; 163 } 164 static int waittime = -1; 165 static struct pcb dumppcb; 166 167 /* 168 * Go through the rigmarole of shutting down.. 169 * this used to be in machdep.c but I'll be dammned if I could see 170 * anything machine dependant in it. 171 */ 172 static void 173 boot(howto) 174 int howto; 175 { 176 177 #ifdef SMP 178 if (smp_active) { 179 printf("boot() called on cpu#%d\n", cpuid); 180 } 181 #endif 182 /* 183 * Do any callouts that should be done BEFORE syncing the filesystems. 184 */ 185 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 186 187 /* 188 * Now sync filesystems 189 */ 190 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 191 register struct buf *bp; 192 int iter, nbusy; 193 194 waittime = 0; 195 printf("\nsyncing disks... "); 196 197 sync(&proc0, NULL); 198 199 /* 200 * With soft updates, some buffers that are 201 * written will be remarked as dirty until other 202 * buffers are written. 203 */ 204 for (iter = 0; iter < 20; iter++) { 205 nbusy = 0; 206 for (bp = &buf[nbuf]; --bp >= buf; ) { 207 if ((bp->b_flags & B_INVAL) == 0 && 208 BUF_REFCNT(bp) > 0) { 209 nbusy++; 210 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 211 == B_DELWRI) { 212 /* bawrite(bp);*/ 213 nbusy++; 214 } 215 } 216 if (nbusy == 0) 217 break; 218 printf("%d ", nbusy); 219 sync(&proc0, NULL); 220 DELAY(50000 * iter); 221 } 222 /* 223 * Count only busy local buffers to prevent forcing 224 * a fsck if we're just a client of a wedged NFS server 225 */ 226 nbusy = 0; 227 for (bp = &buf[nbuf]; --bp >= buf; ) { 228 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 229 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 230 if (bp->b_dev == NODEV) 231 CIRCLEQ_REMOVE(&mountlist, 232 bp->b_vp->v_mount, mnt_list); 233 else 234 nbusy++; 235 } 236 237 238 } 239 if (nbusy) { 240 /* 241 * Failed to sync all blocks. Indicate this and don't 242 * unmount filesystems (thus forcing an fsck on reboot). 243 */ 244 printf("giving up\n"); 245 #ifdef SHOW_BUSYBUFS 246 nbusy = 0; 247 for (bp = &buf[nbuf]; --bp >= buf; ) { 248 if ((bp->b_flags & B_INVAL) == 0 && 249 BUF_REFCNT(bp) > 0) { 250 nbusy++; 251 printf( 252 "%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", 253 nbusy, devtoname(bp->b_dev), 254 bp->b_flags, (long)bp->b_blkno, 255 (long)bp->b_lblkno); 256 } 257 } 258 DELAY(5000000); /* 5 seconds */ 259 #endif 260 } else { 261 printf("done\n"); 262 /* 263 * Unmount filesystems 264 */ 265 if (panicstr == 0) 266 vfs_unmountall(); 267 } 268 DELAY(100000); /* wait for console output to finish */ 269 } 270 271 /* 272 * Ok, now do things that assume all filesystem activity has 273 * been completed. 274 */ 275 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 276 splhigh(); 277 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) { 278 savectx(&dumppcb); 279 #ifdef __i386__ 280 dumppcb.pcb_cr3 = rcr3(); 281 #endif 282 dumpsys(); 283 } 284 285 /* Now that we're going to really halt the system... */ 286 EVENTHANDLER_INVOKE(shutdown_final, howto); 287 288 for(;;) ; /* safety against shutdown_reset not working */ 289 /* NOTREACHED */ 290 } 291 292 /* 293 * If the shutdown was a clean halt, behave accordingly. 294 */ 295 static void 296 shutdown_halt(void *junk, int howto) 297 { 298 if (howto & RB_HALT) { 299 printf("\n"); 300 printf("The operating system has halted.\n"); 301 printf("Please press any key to reboot.\n\n"); 302 switch (cngetc()) { 303 case -1: /* No console, just die */ 304 cpu_halt(); 305 /* NOTREACHED */ 306 default: 307 howto &= ~RB_HALT; 308 break; 309 } 310 } 311 } 312 313 /* 314 * Check to see if the system paniced, pause and then reboot 315 * according to the specified delay. 316 */ 317 static void 318 shutdown_panic(void *junk, int howto) 319 { 320 int loop; 321 322 if (howto & RB_DUMP) { 323 if (PANIC_REBOOT_WAIT_TIME != 0) { 324 if (PANIC_REBOOT_WAIT_TIME != -1) { 325 printf("Automatic reboot in %d seconds - " 326 "press a key on the console to abort\n", 327 PANIC_REBOOT_WAIT_TIME); 328 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 329 loop > 0; --loop) { 330 DELAY(1000 * 100); /* 1/10th second */ 331 /* Did user type a key? */ 332 if (cncheckc() != -1) 333 break; 334 } 335 if (!loop) 336 return; 337 } 338 } else { /* zero time specified - reboot NOW */ 339 return; 340 } 341 printf("--> Press a key on the console to reboot <--\n"); 342 cngetc(); 343 } 344 } 345 346 /* 347 * Everything done, now reset 348 */ 349 static void 350 shutdown_reset(void *junk, int howto) 351 { 352 printf("Rebooting...\n"); 353 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 354 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 355 cpu_reset(); 356 /* NOTREACHED */ /* assuming reset worked */ 357 } 358 359 /* 360 * Magic number for savecore 361 * 362 * exported (symorder) and used at least by savecore(8) 363 * 364 */ 365 static u_long const dumpmag = 0x8fca0101UL; 366 367 static int dumpsize = 0; /* also for savecore */ 368 369 static int dodump = 1; 370 371 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 372 "Try to perform coredump on kernel panic"); 373 374 static int 375 setdumpdev(dev) 376 dev_t dev; 377 { 378 int psize; 379 long newdumplo; 380 381 if (dev == NODEV) { 382 dumpdev = dev; 383 return (0); 384 } 385 if (devsw(dev) == NULL) 386 return (ENXIO); /* XXX is this right? */ 387 if (devsw(dev)->d_psize == NULL) 388 return (ENXIO); /* XXX should be ENODEV ? */ 389 psize = devsw(dev)->d_psize(dev); 390 if (psize == -1) 391 return (ENXIO); /* XXX should be ENODEV ? */ 392 /* 393 * XXX should clean up checking in dumpsys() to be more like this. 394 */ 395 newdumplo = psize - Maxmem * PAGE_SIZE / DEV_BSIZE; 396 if (newdumplo < 0) 397 return (ENOSPC); 398 dumpdev = dev; 399 dumplo = newdumplo; 400 return (0); 401 } 402 403 404 /* ARGSUSED */ 405 static void dump_conf __P((void *dummy)); 406 static void 407 dump_conf(dummy) 408 void *dummy; 409 { 410 if (setdumpdev(dumpdev) != 0) 411 dumpdev = NODEV; 412 } 413 414 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 415 416 static int 417 sysctl_kern_dumpdev SYSCTL_HANDLER_ARGS 418 { 419 int error; 420 udev_t ndumpdev; 421 422 ndumpdev = dev2budev(dumpdev); 423 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 424 if (error == 0 && req->newptr != NULL) 425 error = setdumpdev(udev2dev(ndumpdev, 1)); 426 return (error); 427 } 428 429 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 430 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 431 432 /* 433 * Doadump comes here after turning off memory management and 434 * getting on the dump stack, either when called above, or by 435 * the auto-restart code. 436 */ 437 static void 438 dumpsys(void) 439 { 440 int error; 441 static int dumping; 442 443 if (dumping++) { 444 printf("Dump already in progress, bailing...\n"); 445 return; 446 } 447 if (!dodump) 448 return; 449 if (dumpdev == NODEV) 450 return; 451 if (!(devsw(dumpdev))) 452 return; 453 if (!(devsw(dumpdev)->d_dump)) 454 return; 455 dumpsize = Maxmem; 456 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 457 printf("dump "); 458 error = (*devsw(dumpdev)->d_dump)(dumpdev); 459 if (error == 0) { 460 printf("succeeded\n"); 461 return; 462 } 463 printf("failed, reason: "); 464 switch (error) { 465 case ENODEV: 466 printf("device doesn't support a dump routine\n"); 467 break; 468 469 case ENXIO: 470 printf("device bad\n"); 471 break; 472 473 case EFAULT: 474 printf("device not ready\n"); 475 break; 476 477 case EINVAL: 478 printf("area improper\n"); 479 break; 480 481 case EIO: 482 printf("i/o error\n"); 483 break; 484 485 case EINTR: 486 printf("aborted from console\n"); 487 break; 488 489 default: 490 printf("unknown, error = %d\n", error); 491 break; 492 } 493 } 494 495 /* 496 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 497 * and then reboots. If we are called twice, then we avoid trying to sync 498 * the disks as this often leads to recursive panics. 499 */ 500 void 501 panic(const char *fmt, ...) 502 { 503 int bootopt; 504 va_list ap; 505 static char buf[256]; 506 507 bootopt = RB_AUTOBOOT | RB_DUMP; 508 if (panicstr) 509 bootopt |= RB_NOSYNC; 510 else 511 panicstr = fmt; 512 513 va_start(ap, fmt); 514 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 515 if (panicstr == fmt) 516 panicstr = buf; 517 va_end(ap); 518 printf("panic: %s\n", buf); 519 #ifdef SMP 520 /* three seperate prints in case of an unmapped page and trap */ 521 printf("mp_lock = %08x; ", mp_lock); 522 printf("cpuid = %d; ", cpuid); 523 printf("lapic.id = %08x\n", lapic.id); 524 #endif 525 526 #if defined(DDB) 527 if (debugger_on_panic) 528 Debugger ("panic"); 529 #endif 530 boot(bootopt); 531 } 532 533 /* 534 * Support for poweroff delay. 535 */ 536 static int poweroff_delay = 0; 537 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 538 &poweroff_delay, 0, ""); 539 540 static void 541 poweroff_wait(void *junk, int howto) 542 { 543 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 544 return; 545 DELAY(poweroff_delay * 1000); 546 } 547