kern_shutdown.c revision 37555
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 1.33 1998/06/07 17:11:35 dfr 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 81static int debugger_on_panic = 0; 82#else 83static int debugger_on_panic = 1; 84#endif 85SYSCTL_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 */ 97watchdog_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 */ 104const char *panicstr; 105 106/* 107 * callout list for things to do a shutdown 108 */ 109typedef 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 */ 119static sle_p shutdown_list1; 120static sle_p shutdown_list2; 121 122static void boot __P((int)) __dead2; 123static void dumpsys __P((void)); 124 125#ifndef _SYS_SYSPROTO_H_ 126struct reboot_args { 127 int opt; 128}; 129#endif 130/* ARGSUSED */ 131 132/* 133 * The system call that results in a reboot 134 */ 135int 136reboot(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 */ 152void 153shutdown_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} 164static int waittime = -1; 165static 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 */ 172static void 173boot(howto) 174 int howto; 175{ 176 sle_p ep; 177 178#ifdef SMP 179 if (smp_active) { 180 printf("boot() called on cpu#%d\n", cpuid); 181 } 182#endif 183 /* 184 * Do any callouts that should be done BEFORE syncing the filesystems. 185 */ 186 ep = shutdown_list1; 187 while (ep) { 188 shutdown_list1 = ep->next; 189 (*ep->function)(howto, ep->arg); 190 ep = ep->next; 191 } 192 193 /* 194 * Now sync filesystems 195 */ 196 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 197 register struct buf *bp; 198 int iter, nbusy; 199 200 waittime = 0; 201 printf("\nsyncing disks... "); 202 203 sync(&proc0, NULL); 204 205 /* 206 * With soft updates, some buffers that are 207 * written will be remarked as dirty until other 208 * buffers are written. 209 */ 210 for (iter = 0; iter < 20; iter++) { 211 nbusy = 0; 212 for (bp = &buf[nbuf]; --bp >= buf; ) { 213 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 214 nbusy++; 215 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 216 == B_DELWRI) { 217 /* bawrite(bp);*/ 218 nbusy++; 219 } 220 } 221 if (nbusy == 0) 222 break; 223 printf("%d ", nbusy); 224 sync(&proc0, NULL); 225 DELAY(50000 * iter); 226 } 227 if (nbusy) { 228 /* 229 * Failed to sync all blocks. Indicate this and don't 230 * unmount filesystems (thus forcing an fsck on reboot). 231 */ 232 printf("giving up\n"); 233#ifdef SHOW_BUSYBUFS 234 nbusy = 0; 235 for (bp = &buf[nbuf]; --bp >= buf; ) { 236 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 237 nbusy++; 238 printf( 239 "%d: dev:%08lx, flags:%08lx, blkno:%ld, lblkno:%ld\n", 240 nbusy, (u_long)bp->b_dev, 241 bp->b_flags, (long)bp->b_blkno, 242 (long)bp->b_lblkno); 243 } 244 } 245 DELAY(5000000); /* 5 seconds */ 246#endif 247 } else { 248 printf("done\n"); 249 /* 250 * Unmount filesystems 251 */ 252 if (panicstr == 0) 253 vfs_unmountall(); 254 } 255 DELAY(100000); /* wait for console output to finish */ 256 } 257 258 /* 259 * Ok, now do things that assume all filesystem activity has 260 * been completed. 261 */ 262 ep = shutdown_list2; 263 while (ep) { 264 shutdown_list2 = ep->next; 265 (*ep->function)(howto, ep->arg); 266 ep = ep->next; 267 } 268 splhigh(); 269 if (howto & RB_HALT) { 270 cpu_power_down(); 271 printf("\n"); 272 printf("The operating system has halted.\n"); 273 printf("Please press any key to reboot.\n\n"); 274 switch (cngetc()) { 275 case -1: /* No console, just die */ 276 cpu_halt(); 277 /* NOTREACHED */ 278 default: 279 break; 280 } 281 } else { 282 if (howto & RB_DUMP) { 283 if (!cold) { 284 savectx(&dumppcb); 285#ifdef __i386__ 286 dumppcb.pcb_cr3 = rcr3(); 287#endif 288 dumpsys(); 289 } 290 291 if (PANIC_REBOOT_WAIT_TIME != 0) { 292 if (PANIC_REBOOT_WAIT_TIME != -1) { 293 int loop; 294 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 295 PANIC_REBOOT_WAIT_TIME); 296 for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 297 DELAY(1000 * 100); /* 1/10th second */ 298 /* Did user type a key? */ 299 if (cncheckc() != -1) 300 break; 301 } 302 if (!loop) 303 goto die; 304 } 305 } else { /* zero time specified - reboot NOW */ 306 goto die; 307 } 308 printf("--> Press a key on the console to reboot <--\n"); 309 cngetc(); 310 } 311 } 312die: 313 printf("Rebooting...\n"); 314 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 315 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 316 cpu_reset(); 317 for(;;) ; 318 /* NOTREACHED */ 319} 320 321/* 322 * Magic number for savecore 323 * 324 * exported (symorder) and used at least by savecore(8) 325 * 326 */ 327static u_long const dumpmag = 0x8fca0101UL; 328 329static int dumpsize = 0; /* also for savecore */ 330 331static int dodump = 1; 332SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 333 334/* ARGSUSED */ 335static void dump_conf __P((void *dummy)); 336static void 337dump_conf(dummy) 338 void *dummy; 339{ 340 cpu_dumpconf(); 341} 342SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 343 344/* 345 * Doadump comes here after turning off memory management and 346 * getting on the dump stack, either when called above, or by 347 * the auto-restart code. 348 */ 349static void 350dumpsys(void) 351{ 352 353 if (!dodump) 354 return; 355 if (dumpdev == NODEV) 356 return; 357 if ((minor(dumpdev)&07) != 1) 358 return; 359 if (!(bdevsw[major(dumpdev)])) 360 return; 361 if (!(bdevsw[major(dumpdev)]->d_dump)) 362 return; 363 dumpsize = Maxmem; 364 printf("\ndumping to dev %lx, offset %ld\n", (u_long)dumpdev, dumplo); 365 printf("dump "); 366 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 367 368 case ENXIO: 369 printf("device bad\n"); 370 break; 371 372 case EFAULT: 373 printf("device not ready\n"); 374 break; 375 376 case EINVAL: 377 printf("area improper\n"); 378 break; 379 380 case EIO: 381 printf("i/o error\n"); 382 break; 383 384 case EINTR: 385 printf("aborted from console\n"); 386 break; 387 388 default: 389 printf("succeeded\n"); 390 break; 391 } 392} 393 394/* 395 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 396 * and then reboots. If we are called twice, then we avoid trying to sync 397 * the disks as this often leads to recursive panics. 398 */ 399void 400panic(const char *fmt, ...) 401{ 402 int bootopt; 403 va_list ap; 404 405 bootopt = RB_AUTOBOOT | RB_DUMP; 406 if (panicstr) 407 bootopt |= RB_NOSYNC; 408 else 409 panicstr = fmt; 410 411 printf("panic: "); 412 va_start(ap, fmt); 413 vprintf(fmt, ap); 414 va_end(ap); 415 printf("\n"); 416#ifdef SMP 417 /* three seperate prints in case of an unmapped page and trap */ 418 printf("mp_lock = %08x; ", mp_lock); 419 printf("cpuid = %d; ", cpuid); 420 printf("lapic.id = %08x\n", lapic.id); 421#endif 422 423#if defined(DDB) 424 if (debugger_on_panic) 425 Debugger ("panic"); 426#endif 427 boot(bootopt); 428} 429 430/* 431 * Two routines to handle adding/deleting items on the 432 * shutdown callout lists 433 * 434 * at_shutdown(): 435 * Take the arguments given and put them onto the shutdown callout list. 436 * However first make sure that it's not already there. 437 * returns 0 on success. 438 */ 439int 440at_shutdown(bootlist_fn function, void *arg, int position) 441{ 442 sle_p ep, *epp; 443 444 switch(position) { 445 case SHUTDOWN_PRE_SYNC: 446 epp = &shutdown_list1; 447 break; 448 case SHUTDOWN_POST_SYNC: 449 epp = &shutdown_list2; 450 break; 451 default: 452 printf("bad exit callout list specified\n"); 453 return (EINVAL); 454 } 455 if (rm_at_shutdown(function, arg)) 456 printf("exit callout entry already present\n"); 457 ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT); 458 if (ep == NULL) 459 return (ENOMEM); 460 ep->next = *epp; 461 ep->function = function; 462 ep->arg = arg; 463 *epp = ep; 464 return (0); 465} 466 467/* 468 * Scan the exit callout lists for the given items and remove them. 469 * Returns the number of items removed. 470 */ 471int 472rm_at_shutdown(bootlist_fn function, void *arg) 473{ 474 sle_p *epp, ep; 475 int count; 476 477 count = 0; 478 epp = &shutdown_list1; 479 ep = *epp; 480 while (ep) { 481 if ((ep->function == function) && (ep->arg == arg)) { 482 *epp = ep->next; 483 free(ep, M_TEMP); 484 count++; 485 } else { 486 epp = &ep->next; 487 } 488 ep = *epp; 489 } 490 epp = &shutdown_list2; 491 ep = *epp; 492 while (ep) { 493 if ((ep->function == function) && (ep->arg == arg)) { 494 *epp = ep->next; 495 free(ep, M_TEMP); 496 count++; 497 } else { 498 epp = &ep->next; 499 } 500 ep = *epp; 501 } 502 return (count); 503} 504 505