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 1.23 1997/09/02 20:05:41 bde Exp $ 40 */ 41 42 #include "opt_ddb.h" 43 #include "opt_panic.h" 44 #include "opt_show_busybufs.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/reboot.h> 49 #include <sys/proc.h> 50 #include <sys/vnode.h> 51 #include <sys/malloc.h> 52 #include <sys/kernel.h> 53 #include <sys/mount.h> 54 #include <sys/sysctl.h> 55 #include <sys/conf.h> 56 #include <sys/sysproto.h> 57 58 #include <machine/pcb.h> 59 #include <machine/clock.h> 60 #include <machine/cons.h> 61 #include <machine/md_var.h> 62 #ifdef SMP 63 #include <machine/smp.h> /* smp_active, cpuid */ 64 #endif 65 66 #include <sys/signalvar.h> 67 68 #ifndef PANIC_REBOOT_WAIT_TIME 69 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 70 #endif 71 72 /* 73 * Note that stdarg.h and the ANSI style va_start macro is used for both 74 * ANSI and traditional C compilers. 75 */ 76 #include <machine/stdarg.h> 77 78 #ifdef DDB 79 #ifdef DDB_UNATTENDED 80 static int debugger_on_panic = 0; 81 #else 82 static int debugger_on_panic = 1; 83 #endif 84 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 85 &debugger_on_panic, 0, ""); 86 #endif 87 88 #ifdef HW_WDOG 89 /* 90 * If there is a hardware watchdog, point this at the function needed to 91 * hold it off. 92 * It's needed when the kernel needs to do some lengthy operations. 93 * e.g. in wd.c when dumping core.. It's most annoying to have 94 * your precious core-dump only half written because the wdog kicked in. 95 */ 96 watchdog_tickle_fn wdog_tickler = NULL; 97 #endif /* HW_WDOG */ 98 99 /* 100 * Variable panicstr contains argument to first call to panic; used as flag 101 * to indicate that the kernel has already called panic. 102 */ 103 const char *panicstr; 104 105 /* 106 * callout list for things to do a shutdown 107 */ 108 typedef struct shutdown_list_element { 109 struct shutdown_list_element *next; 110 bootlist_fn function; 111 void *arg; 112 } *sle_p; 113 114 /* 115 * there are two shutdown lists. Some things need to be shut down 116 * Earlier than others. 117 */ 118 static sle_p shutdown_list1; 119 static sle_p shutdown_list2; 120 121 122 static void dumpsys(void); 123 124 #ifndef _SYS_SYSPROTO_H_ 125 struct reboot_args { 126 int opt; 127 }; 128 #endif 129 /* ARGSUSED */ 130 131 /* 132 * The system call that results in a reboot 133 */ 134 int 135 reboot(p, uap, retval) 136 struct proc *p; 137 struct reboot_args *uap; 138 int *retval; 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 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, NULL); 219 220 for (iter = 0; iter < 20; iter++) { 221 nbusy = 0; 222 for (bp = &buf[nbuf]; --bp >= buf; ) { 223 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 224 nbusy++; 225 } 226 } 227 if (nbusy == 0) 228 break; 229 printf("%d ", nbusy); 230 DELAY(40000 * iter); 231 } 232 if (nbusy) { 233 /* 234 * Failed to sync all blocks. Indicate this and don't 235 * unmount filesystems (thus forcing an fsck on reboot). 236 */ 237 printf("giving up\n"); 238 #ifdef SHOW_BUSYBUFS 239 nbusy = 0; 240 for (bp = &buf[nbuf]; --bp >= buf; ) { 241 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 242 nbusy++; 243 printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); 244 } 245 } 246 DELAY(5000000); /* 5 seconds */ 247 #endif 248 } else { 249 printf("done\n"); 250 /* 251 * Unmount filesystems 252 */ 253 if (panicstr == 0) 254 vfs_unmountall(); 255 } 256 DELAY(100000); /* wait for console output to finish */ 257 } 258 259 /* 260 * Ok, now do things that assume all filesystem activity has 261 * been completed. 262 */ 263 ep = shutdown_list2; 264 while (ep) { 265 shutdown_list2 = ep->next; 266 (*ep->function)(howto, ep->arg); 267 ep = ep->next; 268 } 269 splhigh(); 270 if (howto & RB_HALT) { 271 cpu_power_down(); 272 printf("\n"); 273 printf("The operating system has halted.\n"); 274 printf("Please press any key to reboot.\n\n"); 275 switch (cngetc()) { 276 case -1: /* No console, just die */ 277 cpu_halt(); 278 /* NOTREACHED */ 279 default: 280 break; 281 } 282 } else { 283 if (howto & RB_DUMP) { 284 if (!cold) { 285 savectx(&dumppcb); 286 dumppcb.pcb_cr3 = rcr3(); 287 dumpsys(); 288 } 289 290 if (PANIC_REBOOT_WAIT_TIME != 0) { 291 if (PANIC_REBOOT_WAIT_TIME != -1) { 292 int loop; 293 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 294 PANIC_REBOOT_WAIT_TIME); 295 for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 296 DELAY(1000 * 100); /* 1/10th second */ 297 /* Did user type a key? */ 298 if (cncheckc() != -1) 299 break; 300 } 301 if (!loop) 302 goto die; 303 } 304 } else { /* zero time specified - reboot NOW */ 305 goto die; 306 } 307 printf("--> Press a key on the console to reboot <--\n"); 308 cngetc(); 309 } 310 } 311 die: 312 printf("Rebooting...\n"); 313 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 314 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 315 cpu_reset(); 316 for(;;) ; 317 /* NOTREACHED */ 318 } 319 320 /* 321 * Magic number for savecore 322 * 323 * exported (symorder) and used at least by savecore(8) 324 * 325 */ 326 static u_long const dumpmag = 0x8fca0101UL; 327 328 static int dumpsize = 0; /* also for savecore */ 329 330 static int dodump = 1; 331 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 332 333 /* 334 * Doadump comes here after turning off memory management and 335 * getting on the dump stack, either when called above, or by 336 * the auto-restart code. 337 */ 338 static void 339 dumpsys(void) 340 { 341 342 if (!dodump) 343 return; 344 if (dumpdev == NODEV) 345 return; 346 if ((minor(dumpdev)&07) != 1) 347 return; 348 if (!(bdevsw[major(dumpdev)])) 349 return; 350 if (!(bdevsw[major(dumpdev)]->d_dump)) 351 return; 352 dumpsize = Maxmem; 353 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 354 printf("dump "); 355 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 356 357 case ENXIO: 358 printf("device bad\n"); 359 break; 360 361 case EFAULT: 362 printf("device not ready\n"); 363 break; 364 365 case EINVAL: 366 printf("area improper\n"); 367 break; 368 369 case EIO: 370 printf("i/o error\n"); 371 break; 372 373 case EINTR: 374 printf("aborted from console\n"); 375 break; 376 377 default: 378 printf("succeeded\n"); 379 break; 380 } 381 } 382 383 /* 384 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 385 * and then reboots. If we are called twice, then we avoid trying to sync 386 * the disks as this often leads to recursive panics. 387 */ 388 void 389 panic(const char *fmt, ...) 390 { 391 int bootopt; 392 va_list ap; 393 394 bootopt = RB_AUTOBOOT | RB_DUMP; 395 if (panicstr) 396 bootopt |= RB_NOSYNC; 397 else 398 panicstr = fmt; 399 400 printf("panic: "); 401 va_start(ap, fmt); 402 vprintf(fmt, ap); 403 va_end(ap); 404 printf("\n"); 405 #ifdef SMP 406 /* three seperate prints in case of an unmapped page and trap */ 407 printf("mp_lock = %08x; ", mp_lock); 408 printf("cpuid = %d; ", cpuid); 409 printf("lapic.id = %08x\n", lapic.id); 410 #endif 411 412 #if defined(DDB) 413 if (debugger_on_panic) 414 Debugger ("panic"); 415 #endif 416 boot(bootopt); 417 } 418 419 /* 420 * Two routines to handle adding/deleting items on the 421 * shutdown callout lists 422 * 423 * at_shutdown(): 424 * Take the arguments given and put them onto the shutdown callout list. 425 * However first make sure that it's not already there. 426 * returns 0 on success. 427 */ 428 int 429 at_shutdown(bootlist_fn function, void *arg, int position) 430 { 431 sle_p ep, *epp; 432 433 switch(position) { 434 case SHUTDOWN_PRE_SYNC: 435 epp = &shutdown_list1; 436 break; 437 case SHUTDOWN_POST_SYNC: 438 epp = &shutdown_list2; 439 break; 440 default: 441 printf("bad exit callout list specified\n"); 442 return (EINVAL); 443 } 444 if (rm_at_shutdown(function, arg)) 445 printf("exit callout entry already present\n"); 446 ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT); 447 if (ep == NULL) 448 return (ENOMEM); 449 ep->next = *epp; 450 ep->function = function; 451 ep->arg = arg; 452 *epp = ep; 453 return (0); 454 } 455 456 /* 457 * Scan the exit callout lists for the given items and remove them. 458 * Returns the number of items removed. 459 */ 460 int 461 rm_at_shutdown(bootlist_fn function, void *arg) 462 { 463 sle_p *epp, ep; 464 int count; 465 466 count = 0; 467 epp = &shutdown_list1; 468 ep = *epp; 469 while (ep) { 470 if ((ep->function == function) && (ep->arg == arg)) { 471 *epp = ep->next; 472 free(ep, M_TEMP); 473 count++; 474 } else { 475 epp = &ep->next; 476 } 477 ep = *epp; 478 } 479 epp = &shutdown_list2; 480 ep = *epp; 481 while (ep) { 482 if ((ep->function == function) && (ep->arg == arg)) { 483 *epp = ep->next; 484 free(ep, M_TEMP); 485 count++; 486 } else { 487 epp = &ep->next; 488 } 489 ep = *epp; 490 } 491 return (count); 492 } 493 494