kern_shutdown.c revision 53023
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: head/sys/kern/kern_shutdown.c 53023 1999-11-08 19:36:45Z phk $ 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 83int debugger_on_panic = 0; 84#else 85int debugger_on_panic = 1; 86#endif 87SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 88 &debugger_on_panic, 0, "Run debugger on kernel panic"); 89#endif 90 91SYSCTL_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 */ 101watchdog_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 */ 108const char *panicstr; 109 110static void boot __P((int)) __dead2; 111static void dumpsys __P((void)); 112static int setdumpdev __P((dev_t dev)); 113static void poweroff_wait __P((void *, int)); 114static void shutdown_halt __P((void *junk, int howto)); 115static void shutdown_panic __P((void *junk, int howto)); 116static void shutdown_reset __P((void *junk, int howto)); 117 118/* register various local shutdown events */ 119static void 120shutdown_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 128SYSINIT(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 */ 135int 136reboot(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 */ 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{ 176 177#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 printf("\n"); 223 /* 224 * Count only busy local buffers to prevent forcing 225 * a fsck if we're just a client of a wedged NFS server 226 */ 227 nbusy = 0; 228 for (bp = &buf[nbuf]; --bp >= buf; ) { 229 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 230 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 231 if (bp->b_dev == NODEV) { 232 CIRCLEQ_REMOVE(&mountlist, 233 bp->b_vp->v_mount, mnt_list); 234 continue; 235 } 236 nbusy++; 237#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 238 printf( 239 "%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", 240 nbusy, devtoname(bp->b_dev), 241 bp->b_flags, (long)bp->b_blkno, 242 (long)bp->b_lblkno); 243#endif 244 } 245 } 246 if (nbusy) { 247 /* 248 * Failed to sync all blocks. Indicate this and don't 249 * unmount filesystems (thus forcing an fsck on reboot). 250 */ 251 printf("giving up on %d buffers\n", nbusy); 252 DELAY(5000000); /* 5 seconds */ 253 } else { 254 printf("done\n"); 255 /* 256 * Unmount filesystems 257 */ 258 if (panicstr == 0) 259 vfs_unmountall(); 260 } 261 DELAY(100000); /* wait for console output to finish */ 262 } 263 264 /* 265 * Ok, now do things that assume all filesystem activity has 266 * been completed. 267 */ 268 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 269 splhigh(); 270 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) { 271 savectx(&dumppcb); 272#ifdef __i386__ 273 dumppcb.pcb_cr3 = rcr3(); 274#endif 275 dumpsys(); 276 } 277 278 /* Now that we're going to really halt the system... */ 279 EVENTHANDLER_INVOKE(shutdown_final, howto); 280 281 for(;;) ; /* safety against shutdown_reset not working */ 282 /* NOTREACHED */ 283} 284 285/* 286 * If the shutdown was a clean halt, behave accordingly. 287 */ 288static void 289shutdown_halt(void *junk, int howto) 290{ 291 if (howto & RB_HALT) { 292 printf("\n"); 293 printf("The operating system has halted.\n"); 294 printf("Please press any key to reboot.\n\n"); 295 switch (cngetc()) { 296 case -1: /* No console, just die */ 297 cpu_halt(); 298 /* NOTREACHED */ 299 default: 300 howto &= ~RB_HALT; 301 break; 302 } 303 } 304} 305 306/* 307 * Check to see if the system paniced, pause and then reboot 308 * according to the specified delay. 309 */ 310static void 311shutdown_panic(void *junk, int howto) 312{ 313 int loop; 314 315 if (howto & RB_DUMP) { 316 if (PANIC_REBOOT_WAIT_TIME != 0) { 317 if (PANIC_REBOOT_WAIT_TIME != -1) { 318 printf("Automatic reboot in %d seconds - " 319 "press a key on the console to abort\n", 320 PANIC_REBOOT_WAIT_TIME); 321 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 322 loop > 0; --loop) { 323 DELAY(1000 * 100); /* 1/10th second */ 324 /* Did user type a key? */ 325 if (cncheckc() != -1) 326 break; 327 } 328 if (!loop) 329 return; 330 } 331 } else { /* zero time specified - reboot NOW */ 332 return; 333 } 334 printf("--> Press a key on the console to reboot <--\n"); 335 cngetc(); 336 } 337} 338 339/* 340 * Everything done, now reset 341 */ 342static void 343shutdown_reset(void *junk, int howto) 344{ 345 printf("Rebooting...\n"); 346 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 347 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 348 cpu_reset(); 349 /* NOTREACHED */ /* assuming reset worked */ 350} 351 352/* 353 * Magic number for savecore 354 * 355 * exported (symorder) and used at least by savecore(8) 356 * 357 */ 358static u_long const dumpmag = 0x8fca0101UL; 359 360static int dumpsize = 0; /* also for savecore */ 361 362static int dodump = 1; 363 364SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 365 "Try to perform coredump on kernel panic"); 366 367static int 368setdumpdev(dev) 369 dev_t dev; 370{ 371 int psize; 372 long newdumplo; 373 374 if (dev == NODEV) { 375 dumpdev = dev; 376 return (0); 377 } 378 if (devsw(dev) == NULL) 379 return (ENXIO); /* XXX is this right? */ 380 if (devsw(dev)->d_psize == NULL) 381 return (ENXIO); /* XXX should be ENODEV ? */ 382 psize = devsw(dev)->d_psize(dev); 383 if (psize == -1) 384 return (ENXIO); /* XXX should be ENODEV ? */ 385 /* 386 * XXX should clean up checking in dumpsys() to be more like this. 387 */ 388 newdumplo = psize - Maxmem * PAGE_SIZE / DEV_BSIZE; 389 if (newdumplo < 0) 390 return (ENOSPC); 391 dumpdev = dev; 392 dumplo = newdumplo; 393 return (0); 394} 395 396 397/* ARGSUSED */ 398static void dump_conf __P((void *dummy)); 399static void 400dump_conf(dummy) 401 void *dummy; 402{ 403 if (setdumpdev(dumpdev) != 0) 404 dumpdev = NODEV; 405} 406 407SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 408 409static int 410sysctl_kern_dumpdev SYSCTL_HANDLER_ARGS 411{ 412 int error; 413 udev_t ndumpdev; 414 415 ndumpdev = dev2budev(dumpdev); 416 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 417 if (error == 0 && req->newptr != NULL) 418 error = setdumpdev(udev2dev(ndumpdev, 1)); 419 return (error); 420} 421 422SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 423 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 424 425/* 426 * Doadump comes here after turning off memory management and 427 * getting on the dump stack, either when called above, or by 428 * the auto-restart code. 429 */ 430static void 431dumpsys(void) 432{ 433 int error; 434 static int dumping; 435 436 if (dumping++) { 437 printf("Dump already in progress, bailing...\n"); 438 return; 439 } 440 if (!dodump) 441 return; 442 if (dumpdev == NODEV) 443 return; 444 if (!(devsw(dumpdev))) 445 return; 446 if (!(devsw(dumpdev)->d_dump)) 447 return; 448 dumpsize = Maxmem; 449 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 450 printf("dump "); 451 error = (*devsw(dumpdev)->d_dump)(dumpdev); 452 if (error == 0) { 453 printf("succeeded\n"); 454 return; 455 } 456 printf("failed, reason: "); 457 switch (error) { 458 case ENODEV: 459 printf("device doesn't support a dump routine\n"); 460 break; 461 462 case ENXIO: 463 printf("device bad\n"); 464 break; 465 466 case EFAULT: 467 printf("device not ready\n"); 468 break; 469 470 case EINVAL: 471 printf("area improper\n"); 472 break; 473 474 case EIO: 475 printf("i/o error\n"); 476 break; 477 478 case EINTR: 479 printf("aborted from console\n"); 480 break; 481 482 default: 483 printf("unknown, error = %d\n", error); 484 break; 485 } 486} 487 488/* 489 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 490 * and then reboots. If we are called twice, then we avoid trying to sync 491 * the disks as this often leads to recursive panics. 492 */ 493void 494panic(const char *fmt, ...) 495{ 496 int bootopt; 497 va_list ap; 498 static char buf[256]; 499 500 bootopt = RB_AUTOBOOT | RB_DUMP; 501 if (panicstr) 502 bootopt |= RB_NOSYNC; 503 else 504 panicstr = fmt; 505 506 va_start(ap, fmt); 507 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 508 if (panicstr == fmt) 509 panicstr = buf; 510 va_end(ap); 511 printf("panic: %s\n", buf); 512#ifdef SMP 513 /* three seperate prints in case of an unmapped page and trap */ 514 printf("mp_lock = %08x; ", mp_lock); 515 printf("cpuid = %d; ", cpuid); 516 printf("lapic.id = %08x\n", lapic.id); 517#endif 518 519#if defined(DDB) 520 if (debugger_on_panic) 521 Debugger ("panic"); 522#endif 523 boot(bootopt); 524} 525 526/* 527 * Support for poweroff delay. 528 */ 529static int poweroff_delay = 0; 530SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 531 &poweroff_delay, 0, ""); 532 533static void 534poweroff_wait(void *junk, int howto) 535{ 536 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 537 return; 538 DELAY(poweroff_delay * 1000); 539} 540