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 * $Id: kern_shutdown.c,v 1.30 1998/05/06 22:14:48 julian Exp $ 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/buf.h> 50 #include <sys/reboot.h> 51 #include <sys/proc.h> 52 #include <sys/malloc.h> 53 #include <sys/kernel.h> 54 #include <sys/mount.h> 55 #include <sys/sysctl.h> 56 #include <sys/conf.h> 57 #include <sys/sysproto.h> 58 59 #include <machine/pcb.h> 60 #include <machine/clock.h> 61 #include <machine/cons.h> 62 #include <machine/md_var.h> 63 #ifdef SMP 64 #include <machine/smp.h> /* smp_active, cpuid */ 65 #endif 66 67 #include <sys/signalvar.h> 68 69 #ifndef PANIC_REBOOT_WAIT_TIME 70 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 71 #endif 72 73 /* 74 * Note that stdarg.h and the ANSI style va_start macro is used for both 75 * ANSI and traditional C compilers. 76 */ 77 #include <machine/stdarg.h> 78 79 #ifdef DDB 80 #ifdef DDB_UNATTENDED 81 static int debugger_on_panic = 0; 82 #else 83 static int debugger_on_panic = 1; 84 #endif 85 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 86 &debugger_on_panic, 0, ""); 87 #endif 88 89 #ifdef HW_WDOG 90 /* 91 * If there is a hardware watchdog, point this at the function needed to 92 * hold it off. 93 * It's needed when the kernel needs to do some lengthy operations. 94 * e.g. in wd.c when dumping core.. It's most annoying to have 95 * your precious core-dump only half written because the wdog kicked in. 96 */ 97 watchdog_tickle_fn wdog_tickler = NULL; 98 #endif /* HW_WDOG */ 99 100 /* 101 * Variable panicstr contains argument to first call to panic; used as flag 102 * to indicate that the kernel has already called panic. 103 */ 104 const char *panicstr; 105 106 /* 107 * callout list for things to do a shutdown 108 */ 109 typedef struct shutdown_list_element { 110 struct shutdown_list_element *next; 111 bootlist_fn function; 112 void *arg; 113 } *sle_p; 114 115 /* 116 * there are two shutdown lists. Some things need to be shut down 117 * Earlier than others. 118 */ 119 static sle_p shutdown_list1; 120 static sle_p shutdown_list2; 121 122 static void boot __P((int)) __dead2; 123 static void dumpsys __P((void)); 124 125 #ifndef _SYS_SYSPROTO_H_ 126 struct reboot_args { 127 int opt; 128 }; 129 #endif 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->p_ucred, &p->p_acflag))) 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 sle_p ep; 177 178 #ifdef SMP 179 int c, spins; 180 181 /* The MPSPEC says that the BSP must do the shutdown */ 182 if (smp_active) { 183 smp_active = 0; 184 185 spins = 100; 186 187 printf("boot() called on cpu#%d\n", cpuid); 188 while ((c = cpuid) != 0) { 189 if (spins-- < 1) { 190 printf("timeout waiting for cpu #0!\n"); 191 break; 192 } 193 printf("I'm on cpu#%d, I need to be on cpu#0, sleeping..\n", c); 194 tsleep((caddr_t)&smp_active, PZERO, "cpu0wt", 10); 195 } 196 } 197 #endif 198 /* 199 * Do any callouts that should be done BEFORE syncing the filesystems. 200 */ 201 ep = shutdown_list1; 202 while (ep) { 203 shutdown_list1 = ep->next; 204 (*ep->function)(howto, ep->arg); 205 ep = ep->next; 206 } 207 208 /* 209 * Now sync filesystems 210 */ 211 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 212 register struct buf *bp; 213 int iter, nbusy; 214 215 waittime = 0; 216 printf("\nsyncing disks... "); 217 218 sync(&proc0, NULL); 219 220 /* 221 * With soft updates, some buffers that are 222 * written will be remarked as dirty until other 223 * buffers are written. 224 */ 225 for (iter = 0; iter < 20; iter++) { 226 nbusy = 0; 227 for (bp = &buf[nbuf]; --bp >= buf; ) { 228 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 229 nbusy++; 230 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 231 == B_DELWRI) { 232 /* bawrite(bp);*/ 233 nbusy++; 234 } 235 } 236 if (nbusy == 0) 237 break; 238 printf("%d ", nbusy); 239 sync(&proc0, NULL); 240 DELAY(50000 * iter); 241 } 242 if (nbusy) { 243 /* 244 * Failed to sync all blocks. Indicate this and don't 245 * unmount filesystems (thus forcing an fsck on reboot). 246 */ 247 printf("giving up\n"); 248 #ifdef SHOW_BUSYBUFS 249 nbusy = 0; 250 for (bp = &buf[nbuf]; --bp >= buf; ) { 251 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 252 nbusy++; 253 printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); 254 } 255 } 256 DELAY(5000000); /* 5 seconds */ 257 #endif 258 } else { 259 printf("done\n"); 260 /* 261 * Unmount filesystems 262 */ 263 if (panicstr == 0) 264 vfs_unmountall(); 265 } 266 DELAY(100000); /* wait for console output to finish */ 267 } 268 269 /* 270 * Ok, now do things that assume all filesystem activity has 271 * been completed. 272 */ 273 ep = shutdown_list2; 274 while (ep) { 275 shutdown_list2 = ep->next; 276 (*ep->function)(howto, ep->arg); 277 ep = ep->next; 278 } 279 splhigh(); 280 if (howto & RB_HALT) { 281 cpu_power_down(); 282 printf("\n"); 283 printf("The operating system has halted.\n"); 284 printf("Please press any key to reboot.\n\n"); 285 switch (cngetc()) { 286 case -1: /* No console, just die */ 287 cpu_halt(); 288 /* NOTREACHED */ 289 default: 290 break; 291 } 292 } else { 293 if (howto & RB_DUMP) { 294 if (!cold) { 295 savectx(&dumppcb); 296 dumppcb.pcb_cr3 = rcr3(); 297 dumpsys(); 298 } 299 300 if (PANIC_REBOOT_WAIT_TIME != 0) { 301 if (PANIC_REBOOT_WAIT_TIME != -1) { 302 int loop; 303 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 304 PANIC_REBOOT_WAIT_TIME); 305 for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 306 DELAY(1000 * 100); /* 1/10th second */ 307 /* Did user type a key? */ 308 if (cncheckc() != -1) 309 break; 310 } 311 if (!loop) 312 goto die; 313 } 314 } else { /* zero time specified - reboot NOW */ 315 goto die; 316 } 317 printf("--> Press a key on the console to reboot <--\n"); 318 cngetc(); 319 } 320 } 321 die: 322 printf("Rebooting...\n"); 323 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 324 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 325 cpu_reset(); 326 for(;;) ; 327 /* NOTREACHED */ 328 } 329 330 /* 331 * Magic number for savecore 332 * 333 * exported (symorder) and used at least by savecore(8) 334 * 335 */ 336 static u_long const dumpmag = 0x8fca0101UL; 337 338 static int dumpsize = 0; /* also for savecore */ 339 340 static int dodump = 1; 341 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 342 343 /* ARGSUSED */ 344 static void dump_conf __P((void *dummy)); 345 static void 346 dump_conf(dummy) 347 void *dummy; 348 { 349 cpu_dumpconf(); 350 } 351 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 352 353 /* 354 * Doadump comes here after turning off memory management and 355 * getting on the dump stack, either when called above, or by 356 * the auto-restart code. 357 */ 358 static void 359 dumpsys(void) 360 { 361 362 if (!dodump) 363 return; 364 if (dumpdev == NODEV) 365 return; 366 if ((minor(dumpdev)&07) != 1) 367 return; 368 if (!(bdevsw[major(dumpdev)])) 369 return; 370 if (!(bdevsw[major(dumpdev)]->d_dump)) 371 return; 372 dumpsize = Maxmem; 373 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 374 printf("dump "); 375 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 376 377 case ENXIO: 378 printf("device bad\n"); 379 break; 380 381 case EFAULT: 382 printf("device not ready\n"); 383 break; 384 385 case EINVAL: 386 printf("area improper\n"); 387 break; 388 389 case EIO: 390 printf("i/o error\n"); 391 break; 392 393 case EINTR: 394 printf("aborted from console\n"); 395 break; 396 397 default: 398 printf("succeeded\n"); 399 break; 400 } 401 } 402 403 /* 404 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 405 * and then reboots. If we are called twice, then we avoid trying to sync 406 * the disks as this often leads to recursive panics. 407 */ 408 void 409 panic(const char *fmt, ...) 410 { 411 int bootopt; 412 va_list ap; 413 414 bootopt = RB_AUTOBOOT | RB_DUMP; 415 if (panicstr) 416 bootopt |= RB_NOSYNC; 417 else 418 panicstr = fmt; 419 420 printf("panic: "); 421 va_start(ap, fmt); 422 vprintf(fmt, ap); 423 va_end(ap); 424 printf("\n"); 425 #ifdef SMP 426 /* three seperate prints in case of an unmapped page and trap */ 427 printf("mp_lock = %08x; ", mp_lock); 428 printf("cpuid = %d; ", cpuid); 429 printf("lapic.id = %08x\n", lapic.id); 430 #endif 431 432 #if defined(DDB) 433 if (debugger_on_panic) 434 Debugger ("panic"); 435 #endif 436 boot(bootopt); 437 } 438 439 /* 440 * Two routines to handle adding/deleting items on the 441 * shutdown callout lists 442 * 443 * at_shutdown(): 444 * Take the arguments given and put them onto the shutdown callout list. 445 * However first make sure that it's not already there. 446 * returns 0 on success. 447 */ 448 int 449 at_shutdown(bootlist_fn function, void *arg, int position) 450 { 451 sle_p ep, *epp; 452 453 switch(position) { 454 case SHUTDOWN_PRE_SYNC: 455 epp = &shutdown_list1; 456 break; 457 case SHUTDOWN_POST_SYNC: 458 epp = &shutdown_list2; 459 break; 460 default: 461 printf("bad exit callout list specified\n"); 462 return (EINVAL); 463 } 464 if (rm_at_shutdown(function, arg)) 465 printf("exit callout entry already present\n"); 466 ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT); 467 if (ep == NULL) 468 return (ENOMEM); 469 ep->next = *epp; 470 ep->function = function; 471 ep->arg = arg; 472 *epp = ep; 473 return (0); 474 } 475 476 /* 477 * Scan the exit callout lists for the given items and remove them. 478 * Returns the number of items removed. 479 */ 480 int 481 rm_at_shutdown(bootlist_fn function, void *arg) 482 { 483 sle_p *epp, ep; 484 int count; 485 486 count = 0; 487 epp = &shutdown_list1; 488 ep = *epp; 489 while (ep) { 490 if ((ep->function == function) && (ep->arg == arg)) { 491 *epp = ep->next; 492 free(ep, M_TEMP); 493 count++; 494 } else { 495 epp = &ep->next; 496 } 497 ep = *epp; 498 } 499 epp = &shutdown_list2; 500 ep = *epp; 501 while (ep) { 502 if ((ep->function == function) && (ep->arg == arg)) { 503 *epp = ep->next; 504 free(ep, M_TEMP); 505 count++; 506 } else { 507 epp = &ep->next; 508 } 509 ep = *epp; 510 } 511 return (count); 512 } 513 514