kern_shutdown.c revision 72200
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 72200 2001-02-09 06:11:45Z bmilekic $ 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/bio.h> 51#include <sys/buf.h> 52#include <sys/reboot.h> 53#include <sys/proc.h> 54#include <sys/vnode.h> 55#include <sys/kernel.h> 56#include <sys/kthread.h> 57#include <sys/mount.h> 58#include <sys/mutex.h> 59#include <sys/queue.h> 60#include <sys/sysctl.h> 61#include <sys/conf.h> 62#include <sys/sysproto.h> 63#include <sys/cons.h> 64 65#include <machine/pcb.h> 66#include <machine/lock.h> 67#include <machine/md_var.h> 68#include <machine/smp.h> /* smp_active, cpuid */ 69 70#include <sys/signalvar.h> 71 72#ifndef PANIC_REBOOT_WAIT_TIME 73#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 74#endif 75 76/* 77 * Note that stdarg.h and the ANSI style va_start macro is used for both 78 * ANSI and traditional C compilers. 79 */ 80#include <machine/stdarg.h> 81 82#ifdef DDB 83#ifdef DDB_UNATTENDED 84int debugger_on_panic = 0; 85#else 86int debugger_on_panic = 1; 87#endif 88SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 89 &debugger_on_panic, 0, "Run debugger on kernel panic"); 90#endif 91 92SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 93 94#ifdef HW_WDOG 95/* 96 * If there is a hardware watchdog, point this at the function needed to 97 * hold it off. 98 * It's needed when the kernel needs to do some lengthy operations. 99 * e.g. in wd.c when dumping core.. It's most annoying to have 100 * your precious core-dump only half written because the wdog kicked in. 101 */ 102watchdog_tickle_fn wdog_tickler = NULL; 103#endif /* HW_WDOG */ 104 105/* 106 * Variable panicstr contains argument to first call to panic; used as flag 107 * to indicate that the kernel has already called panic. 108 */ 109const char *panicstr; 110 111int dumping; /* system is dumping */ 112 113static void boot(int) __dead2; 114static void dumpsys(void); 115static void poweroff_wait(void *, int); 116static void shutdown_halt(void *junk, int howto); 117static void shutdown_panic(void *junk, int howto); 118static void shutdown_reset(void *junk, int howto); 119 120/* register various local shutdown events */ 121static void 122shutdown_conf(void *unused) 123{ 124 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 125 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 126 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 127 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 128} 129 130SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 131 132/* ARGSUSED */ 133 134/* 135 * The system call that results in a reboot 136 */ 137int 138reboot(struct proc *p, 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 */ 152static int shutdown_howto = 0; 153 154void 155shutdown_nice(int howto) 156{ 157 shutdown_howto = howto; 158 159 /* Send a signal to init(8) and have it shutdown the world */ 160 if (initproc != NULL) { 161 psignal(initproc, SIGINT); 162 } else { 163 /* No init(8) running, so simply reboot */ 164 boot(RB_NOSYNC); 165 } 166 return; 167} 168static int waittime = -1; 169static struct pcb dumppcb; 170 171static void 172print_uptime(void) 173{ 174 int f; 175 struct timespec ts; 176 177 getnanouptime(&ts); 178 printf("Uptime: "); 179 f = 0; 180 if (ts.tv_sec >= 86400) { 181 printf("%ldd", (long)ts.tv_sec / 86400); 182 ts.tv_sec %= 86400; 183 f = 1; 184 } 185 if (f || ts.tv_sec >= 3600) { 186 printf("%ldh", (long)ts.tv_sec / 3600); 187 ts.tv_sec %= 3600; 188 f = 1; 189 } 190 if (f || ts.tv_sec >= 60) { 191 printf("%ldm", (long)ts.tv_sec / 60); 192 ts.tv_sec %= 60; 193 f = 1; 194 } 195 printf("%lds\n", (long)ts.tv_sec); 196} 197 198/* 199 * Go through the rigmarole of shutting down.. 200 * this used to be in machdep.c but I'll be dammned if I could see 201 * anything machine dependant in it. 202 */ 203static void 204boot(int howto) 205{ 206 207 /* collect extra flags that shutdown_nice might have set */ 208 howto |= shutdown_howto; 209 210#ifdef SMP 211 if (smp_active) 212 printf("boot() called on cpu#%d\n", PCPU_GET(cpuid)); 213#endif 214 /* 215 * Do any callouts that should be done BEFORE syncing the filesystems. 216 */ 217 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 218 219 /* 220 * Now sync filesystems 221 */ 222 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 223 register struct buf *bp; 224 int iter, nbusy, pbusy; 225 int subiter; 226 227 waittime = 0; 228 printf("\nsyncing disks... "); 229 230 sync(&proc0, NULL); 231 232 /* 233 * With soft updates, some buffers that are 234 * written will be remarked as dirty until other 235 * buffers are written. 236 */ 237 for (iter = pbusy = 0; iter < 20; iter++) { 238 nbusy = 0; 239 for (bp = &buf[nbuf]; --bp >= buf; ) { 240 if ((bp->b_flags & B_INVAL) == 0 && 241 BUF_REFCNT(bp) > 0) { 242 nbusy++; 243 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 244 == B_DELWRI) { 245 /* bawrite(bp);*/ 246 nbusy++; 247 } 248 } 249 if (nbusy == 0) 250 break; 251 printf("%d ", nbusy); 252 if (nbusy < pbusy) 253 iter = 0; 254 pbusy = nbusy; 255 sync(&proc0, NULL); 256 if (curproc != NULL) { 257 DROP_GIANT_NOSWITCH(); 258 for (subiter = 0; subiter < 50 * iter; subiter++) { 259 mtx_lock_spin(&sched_lock); 260 setrunqueue(curproc); 261 mi_switch(); /* Allow interrupt threads to run */ 262 mtx_unlock_spin(&sched_lock); 263 DELAY(1000); 264 } 265 PICKUP_GIANT(); 266 } else 267 DELAY(50000 * iter); 268 } 269 printf("\n"); 270 /* 271 * Count only busy local buffers to prevent forcing 272 * a fsck if we're just a client of a wedged NFS server 273 */ 274 nbusy = 0; 275 for (bp = &buf[nbuf]; --bp >= buf; ) { 276 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 277 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 278 if (bp->b_dev == NODEV) { 279 TAILQ_REMOVE(&mountlist, 280 bp->b_vp->v_mount, mnt_list); 281 continue; 282 } 283 nbusy++; 284#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 285 printf( 286 "%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", 287 nbusy, devtoname(bp->b_dev), 288 bp->b_flags, (long)bp->b_blkno, 289 (long)bp->b_lblkno); 290#endif 291 } 292 } 293 if (nbusy) { 294 /* 295 * Failed to sync all blocks. Indicate this and don't 296 * unmount filesystems (thus forcing an fsck on reboot). 297 */ 298 printf("giving up on %d buffers\n", nbusy); 299 DELAY(5000000); /* 5 seconds */ 300 } else { 301 printf("done\n"); 302 /* 303 * Unmount filesystems 304 */ 305 if (panicstr == 0) 306 vfs_unmountall(); 307 } 308 DELAY(100000); /* wait for console output to finish */ 309 } 310 311 print_uptime(); 312 313 /* 314 * Ok, now do things that assume all filesystem activity has 315 * been completed. 316 */ 317 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 318 splhigh(); 319 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 320 dumpsys(); 321 322 /* Now that we're going to really halt the system... */ 323 EVENTHANDLER_INVOKE(shutdown_final, howto); 324 325 for(;;) ; /* safety against shutdown_reset not working */ 326 /* NOTREACHED */ 327} 328 329/* 330 * If the shutdown was a clean halt, behave accordingly. 331 */ 332static void 333shutdown_halt(void *junk, int howto) 334{ 335 if (howto & RB_HALT) { 336 printf("\n"); 337 printf("The operating system has halted.\n"); 338 printf("Please press any key to reboot.\n\n"); 339 switch (cngetc()) { 340 case -1: /* No console, just die */ 341 cpu_halt(); 342 /* NOTREACHED */ 343 default: 344 howto &= ~RB_HALT; 345 break; 346 } 347 } 348} 349 350/* 351 * Check to see if the system paniced, pause and then reboot 352 * according to the specified delay. 353 */ 354static void 355shutdown_panic(void *junk, int howto) 356{ 357 int loop; 358 359 if (howto & RB_DUMP) { 360 if (PANIC_REBOOT_WAIT_TIME != 0) { 361 if (PANIC_REBOOT_WAIT_TIME != -1) { 362 printf("Automatic reboot in %d seconds - " 363 "press a key on the console to abort\n", 364 PANIC_REBOOT_WAIT_TIME); 365 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 366 loop > 0; --loop) { 367 DELAY(1000 * 100); /* 1/10th second */ 368 /* Did user type a key? */ 369 if (cncheckc() != -1) 370 break; 371 } 372 if (!loop) 373 return; 374 } 375 } else { /* zero time specified - reboot NOW */ 376 return; 377 } 378 printf("--> Press a key on the console to reboot <--\n"); 379 cngetc(); 380 } 381} 382 383/* 384 * Everything done, now reset 385 */ 386static void 387shutdown_reset(void *junk, int howto) 388{ 389 printf("Rebooting...\n"); 390 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 391 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 392 cpu_reset(); 393 /* NOTREACHED */ /* assuming reset worked */ 394} 395 396/* 397 * Magic number for savecore 398 * 399 * exported (symorder) and used at least by savecore(8) 400 * 401 */ 402static u_long const dumpmag = 0x8fca0101UL; 403 404static int dumpsize = 0; /* also for savecore */ 405 406static int dodump = 1; 407 408SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 409 "Try to perform coredump on kernel panic"); 410 411static int 412setdumpdev(dev_t dev) 413{ 414 int psize; 415 long newdumplo; 416 417 if (dev == NODEV) { 418 dumpdev = dev; 419 return (0); 420 } 421 if (devsw(dev) == NULL) 422 return (ENXIO); /* XXX is this right? */ 423 if (devsw(dev)->d_psize == NULL) 424 return (ENXIO); /* XXX should be ENODEV ? */ 425 psize = devsw(dev)->d_psize(dev); 426 if (psize == -1) 427 return (ENXIO); /* XXX should be ENODEV ? */ 428 /* 429 * XXX should clean up checking in dumpsys() to be more like this. 430 */ 431 newdumplo = psize - Maxmem * PAGE_SIZE / DEV_BSIZE; 432 if (newdumplo < 0) 433 return (ENOSPC); 434 dumpdev = dev; 435 dumplo = newdumplo; 436 return (0); 437} 438 439 440/* ARGSUSED */ 441static void 442dump_conf(void *dummy) 443{ 444 if (setdumpdev(dumpdev) != 0) 445 dumpdev = NODEV; 446} 447 448SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 449 450static int 451sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 452{ 453 int error; 454 udev_t ndumpdev; 455 456 ndumpdev = dev2udev(dumpdev); 457 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 458 if (error == 0 && req->newptr != NULL) 459 error = setdumpdev(udev2dev(ndumpdev, 0)); 460 return (error); 461} 462 463SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 464 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 465 466/* 467 * Doadump comes here after turning off memory management and 468 * getting on the dump stack, either when called above, or by 469 * the auto-restart code. 470 */ 471static void 472dumpsys(void) 473{ 474 int error; 475 476 savectx(&dumppcb); 477 if (dumping++) { 478 printf("Dump already in progress, bailing...\n"); 479 return; 480 } 481 if (!dodump) 482 return; 483 if (dumpdev == NODEV) 484 return; 485 if (!(devsw(dumpdev))) 486 return; 487 if (!(devsw(dumpdev)->d_dump)) 488 return; 489 dumpsize = Maxmem; 490 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 491 printf("dump "); 492 error = (*devsw(dumpdev)->d_dump)(dumpdev); 493 if (error == 0) { 494 printf("succeeded\n"); 495 return; 496 } 497 printf("failed, reason: "); 498 switch (error) { 499 case ENODEV: 500 printf("device doesn't support a dump routine\n"); 501 break; 502 503 case ENXIO: 504 printf("device bad\n"); 505 break; 506 507 case EFAULT: 508 printf("device not ready\n"); 509 break; 510 511 case EINVAL: 512 printf("area improper\n"); 513 break; 514 515 case EIO: 516 printf("i/o error\n"); 517 break; 518 519 case EINTR: 520 printf("aborted from console\n"); 521 break; 522 523 default: 524 printf("unknown, error = %d\n", error); 525 break; 526 } 527} 528 529/* 530 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 531 * and then reboots. If we are called twice, then we avoid trying to sync 532 * the disks as this often leads to recursive panics. 533 */ 534void 535panic(const char *fmt, ...) 536{ 537 int bootopt; 538 va_list ap; 539 static char buf[256]; 540 541#ifdef SMP 542 /* Only 1 CPU can panic at a time */ 543 mtx_lock(&panic_mtx); 544#endif 545 546 bootopt = RB_AUTOBOOT | RB_DUMP; 547 if (panicstr) 548 bootopt |= RB_NOSYNC; 549 else 550 panicstr = fmt; 551 552 va_start(ap, fmt); 553 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 554 if (panicstr == fmt) 555 panicstr = buf; 556 va_end(ap); 557 printf("panic: %s\n", buf); 558#ifdef SMP 559 /* two separate prints in case of an unmapped page and trap */ 560 printf("cpuid = %d; ", PCPU_GET(cpuid)); 561#ifdef APIC_IO 562 printf("lapic.id = %08x\n", lapic.id); 563#endif 564#endif 565 566#if defined(DDB) 567 if (debugger_on_panic) 568 Debugger ("panic"); 569#endif 570 boot(bootopt); 571} 572 573/* 574 * Support for poweroff delay. 575 */ 576#ifndef POWEROFF_DELAY 577# define POWEROFF_DELAY 5000 578#endif 579static int poweroff_delay = POWEROFF_DELAY; 580 581SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 582 &poweroff_delay, 0, ""); 583 584static void 585poweroff_wait(void *junk, int howto) 586{ 587 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 588 return; 589 DELAY(poweroff_delay * 1000); 590} 591 592/* 593 * Some system processes (e.g. syncer) need to be stopped at appropriate 594 * points in their main loops prior to a system shutdown, so that they 595 * won't interfere with the shutdown process (e.g. by holding a disk buf 596 * to cause sync to fail). For each of these system processes, register 597 * shutdown_kproc() as a handler for one of shutdown events. 598 */ 599static int kproc_shutdown_wait = 60; 600SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 601 &kproc_shutdown_wait, 0, ""); 602 603void 604kproc_shutdown(void *arg, int howto) 605{ 606 struct proc *p; 607 int error; 608 609 if (panicstr) 610 return; 611 612 p = (struct proc *)arg; 613 printf("Waiting (max %d seconds) for system process `%s' to stop...", 614 kproc_shutdown_wait, p->p_comm); 615 error = kthread_suspend(p, kproc_shutdown_wait * hz); 616 617 if (error == EWOULDBLOCK) 618 printf("timed out\n"); 619 else 620 printf("stopped\n"); 621} 622