kern_shutdown.c revision 82223
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 82223 2001-08-23 20:32:21Z jhb $ 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/bio.h> 50#include <sys/buf.h> 51#include <sys/conf.h> 52#include <sys/cons.h> 53#include <sys/disklabel.h> 54#include <sys/eventhandler.h> 55#include <sys/kernel.h> 56#include <sys/kthread.h> 57#include <sys/mount.h> 58#include <sys/proc.h> 59#include <sys/reboot.h> 60#include <sys/resourcevar.h> 61#include <sys/smp.h> /* smp_active */ 62#include <sys/sysctl.h> 63#include <sys/sysproto.h> 64#include <sys/vnode.h> 65 66#include <machine/pcb.h> 67#include <machine/md_var.h> 68 69#include <sys/signalvar.h> 70#ifdef DDB 71#include <ddb/ddb.h> 72#endif 73 74#ifndef PANIC_REBOOT_WAIT_TIME 75#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 76#endif 77 78/* 79 * Note that stdarg.h and the ANSI style va_start macro is used for both 80 * ANSI and traditional C compilers. 81 */ 82#include <machine/stdarg.h> 83 84#ifdef DDB 85#ifdef DDB_UNATTENDED 86int debugger_on_panic = 0; 87#else 88int debugger_on_panic = 1; 89#endif 90SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 91 &debugger_on_panic, 0, "Run debugger on kernel panic"); 92#endif 93 94SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 95 96#ifdef HW_WDOG 97/* 98 * If there is a hardware watchdog, point this at the function needed to 99 * hold it off. 100 * It's needed when the kernel needs to do some lengthy operations. 101 * e.g. in wd.c when dumping core.. It's most annoying to have 102 * your precious core-dump only half written because the wdog kicked in. 103 */ 104watchdog_tickle_fn wdog_tickler = NULL; 105#endif /* HW_WDOG */ 106 107/* 108 * Variable panicstr contains argument to first call to panic; used as flag 109 * to indicate that the kernel has already called panic. 110 */ 111const char *panicstr; 112 113int dumping; /* system is dumping */ 114 115static void boot(int) __dead2; 116static void dumpsys(void); 117static void poweroff_wait(void *, int); 118static void shutdown_halt(void *junk, int howto); 119static void shutdown_panic(void *junk, int howto); 120static void shutdown_reset(void *junk, int howto); 121 122/* register various local shutdown events */ 123static void 124shutdown_conf(void *unused) 125{ 126 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 127 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 128 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 129 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 130} 131 132SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 133 134/* ARGSUSED */ 135 136/* 137 * The system call that results in a reboot 138 */ 139int 140reboot(struct proc *p, struct reboot_args *uap) 141{ 142 int error; 143 144 if ((error = suser(p))) 145 return (error); 146 147 boot(uap->opt); 148 return (0); 149} 150 151/* 152 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 153 */ 154static int shutdown_howto = 0; 155 156void 157shutdown_nice(int howto) 158{ 159 shutdown_howto = howto; 160 161 /* Send a signal to init(8) and have it shutdown the world */ 162 if (initproc != NULL) { 163 PROC_LOCK(initproc); 164 psignal(initproc, SIGINT); 165 PROC_UNLOCK(initproc); 166 } else { 167 /* No init(8) running, so simply reboot */ 168 boot(RB_NOSYNC); 169 } 170 return; 171} 172static int waittime = -1; 173static struct pcb dumppcb; 174 175static void 176print_uptime(void) 177{ 178 int f; 179 struct timespec ts; 180 181 getnanouptime(&ts); 182 printf("Uptime: "); 183 f = 0; 184 if (ts.tv_sec >= 86400) { 185 printf("%ldd", (long)ts.tv_sec / 86400); 186 ts.tv_sec %= 86400; 187 f = 1; 188 } 189 if (f || ts.tv_sec >= 3600) { 190 printf("%ldh", (long)ts.tv_sec / 3600); 191 ts.tv_sec %= 3600; 192 f = 1; 193 } 194 if (f || ts.tv_sec >= 60) { 195 printf("%ldm", (long)ts.tv_sec / 60); 196 ts.tv_sec %= 60; 197 f = 1; 198 } 199 printf("%lds\n", (long)ts.tv_sec); 200} 201 202/* 203 * Go through the rigmarole of shutting down.. 204 * this used to be in machdep.c but I'll be dammned if I could see 205 * anything machine dependant in it. 206 */ 207static void 208boot(int howto) 209{ 210 211 /* collect extra flags that shutdown_nice might have set */ 212 howto |= shutdown_howto; 213 214#ifdef DDB 215 /* We are out of the debugger now. */ 216 db_active = 0; 217#endif 218 219#ifdef SMP 220 if (smp_active) 221 printf("boot() called on cpu#%d\n", PCPU_GET(cpuid)); 222#endif 223 /* 224 * Do any callouts that should be done BEFORE syncing the filesystems. 225 */ 226 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 227 228 /* 229 * Now sync filesystems 230 */ 231 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 232 register struct buf *bp; 233 int iter, nbusy, pbusy; 234 int subiter; 235 236 waittime = 0; 237 printf("\nsyncing disks... "); 238 239 sync(&proc0, NULL); 240 241 /* 242 * With soft updates, some buffers that are 243 * written will be remarked as dirty until other 244 * buffers are written. 245 */ 246 for (iter = pbusy = 0; iter < 20; iter++) { 247 nbusy = 0; 248 for (bp = &buf[nbuf]; --bp >= buf; ) { 249 if ((bp->b_flags & B_INVAL) == 0 && 250 BUF_REFCNT(bp) > 0) { 251 nbusy++; 252 } else if ((bp->b_flags & (B_DELWRI | B_INVAL)) 253 == B_DELWRI) { 254 /* bawrite(bp);*/ 255 nbusy++; 256 } 257 } 258 if (nbusy == 0) 259 break; 260 printf("%d ", nbusy); 261 if (nbusy < pbusy) 262 iter = 0; 263 pbusy = nbusy; 264 sync(&proc0, NULL); 265 if (curproc != NULL) { 266 DROP_GIANT_NOSWITCH(); 267 for (subiter = 0; subiter < 50 * iter; subiter++) { 268 mtx_lock_spin(&sched_lock); 269 setrunqueue(curproc); 270 curproc->p_stats->p_ru.ru_nvcsw++; 271 mi_switch(); /* Allow interrupt threads to run */ 272 mtx_unlock_spin(&sched_lock); 273 DELAY(1000); 274 } 275 PICKUP_GIANT(); 276 } else 277 DELAY(50000 * iter); 278 } 279 printf("\n"); 280 /* 281 * Count only busy local buffers to prevent forcing 282 * a fsck if we're just a client of a wedged NFS server 283 */ 284 nbusy = 0; 285 for (bp = &buf[nbuf]; --bp >= buf; ) { 286 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) || 287 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 288 if (bp->b_dev == NODEV) { 289 TAILQ_REMOVE(&mountlist, 290 bp->b_vp->v_mount, mnt_list); 291 continue; 292 } 293 nbusy++; 294#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 295 printf( 296 "%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n", 297 nbusy, devtoname(bp->b_dev), 298 bp->b_flags, (long)bp->b_blkno, 299 (long)bp->b_lblkno); 300#endif 301 } 302 } 303 if (nbusy) { 304 /* 305 * Failed to sync all blocks. Indicate this and don't 306 * unmount filesystems (thus forcing an fsck on reboot). 307 */ 308 printf("giving up on %d buffers\n", nbusy); 309 DELAY(5000000); /* 5 seconds */ 310 } else { 311 printf("done\n"); 312 /* 313 * Unmount filesystems 314 */ 315 if (panicstr == 0) 316 vfs_unmountall(); 317 } 318 DELAY(100000); /* wait for console output to finish */ 319 } 320 321 print_uptime(); 322 323 /* 324 * Ok, now do things that assume all filesystem activity has 325 * been completed. 326 */ 327 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 328 splhigh(); 329 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 330 dumpsys(); 331 332 /* Now that we're going to really halt the system... */ 333 EVENTHANDLER_INVOKE(shutdown_final, howto); 334 335 for(;;) ; /* safety against shutdown_reset not working */ 336 /* NOTREACHED */ 337} 338 339/* 340 * If the shutdown was a clean halt, behave accordingly. 341 */ 342static void 343shutdown_halt(void *junk, int howto) 344{ 345 if (howto & RB_HALT) { 346 printf("\n"); 347 printf("The operating system has halted.\n"); 348 printf("Please press any key to reboot.\n\n"); 349 switch (cngetc()) { 350 case -1: /* No console, just die */ 351 cpu_halt(); 352 /* NOTREACHED */ 353 default: 354 howto &= ~RB_HALT; 355 break; 356 } 357 } 358} 359 360/* 361 * Check to see if the system paniced, pause and then reboot 362 * according to the specified delay. 363 */ 364static void 365shutdown_panic(void *junk, int howto) 366{ 367 int loop; 368 369 if (howto & RB_DUMP) { 370 if (PANIC_REBOOT_WAIT_TIME != 0) { 371 if (PANIC_REBOOT_WAIT_TIME != -1) { 372 printf("Automatic reboot in %d seconds - " 373 "press a key on the console to abort\n", 374 PANIC_REBOOT_WAIT_TIME); 375 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 376 loop > 0; --loop) { 377 DELAY(1000 * 100); /* 1/10th second */ 378 /* Did user type a key? */ 379 if (cncheckc() != -1) 380 break; 381 } 382 if (!loop) 383 return; 384 } 385 } else { /* zero time specified - reboot NOW */ 386 return; 387 } 388 printf("--> Press a key on the console to reboot <--\n"); 389 cngetc(); 390 } 391} 392 393/* 394 * Everything done, now reset 395 */ 396static void 397shutdown_reset(void *junk, int howto) 398{ 399 printf("Rebooting...\n"); 400 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 401 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 402 cpu_reset(); 403 /* NOTREACHED */ /* assuming reset worked */ 404} 405 406/* 407 * Magic number for savecore 408 * 409 * exported (symorder) and used at least by savecore(8) 410 * 411 */ 412static u_long const dumpmag = 0x8fca0101UL; 413 414static int dumpsize = 0; /* also for savecore */ 415 416static int dodump = 1; 417 418SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 419 "Try to perform coredump on kernel panic"); 420 421static int 422setdumpdev(dev_t dev) 423{ 424 int psize; 425 long newdumplo; 426 427 if (dev == NODEV) { 428 dumpdev = dev; 429 return (0); 430 } 431 if (devsw(dev) == NULL) 432 return (ENXIO); /* XXX is this right? */ 433 if (devsw(dev)->d_psize == NULL) 434 return (ENXIO); /* XXX should be ENODEV ? */ 435 psize = devsw(dev)->d_psize(dev); 436 if (psize == -1) 437 return (ENXIO); /* XXX should be ENODEV ? */ 438 /* 439 * XXX should clean up checking in dumpsys() to be more like this. 440 */ 441 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); 442 if (newdumplo <= LABELSECTOR) 443 return (ENOSPC); 444 dumpdev = dev; 445 dumplo = newdumplo; 446 return (0); 447} 448 449 450/* ARGSUSED */ 451static void 452dump_conf(void *dummy) 453{ 454 if (setdumpdev(dumpdev) != 0) 455 dumpdev = NODEV; 456} 457 458SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 459 460static int 461sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 462{ 463 int error; 464 udev_t ndumpdev; 465 466 ndumpdev = dev2udev(dumpdev); 467 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 468 if (error == 0 && req->newptr != NULL) 469 error = setdumpdev(udev2dev(ndumpdev, 0)); 470 return (error); 471} 472 473SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 474 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", ""); 475 476/* 477 * Doadump comes here after turning off memory management and 478 * getting on the dump stack, either when called above, or by 479 * the auto-restart code. 480 */ 481static void 482dumpsys(void) 483{ 484 int error; 485 486 savectx(&dumppcb); 487 if (dumping++) { 488 printf("Dump already in progress, bailing...\n"); 489 return; 490 } 491 if (!dodump) 492 return; 493 if (dumpdev == NODEV) 494 return; 495 if (!(devsw(dumpdev))) 496 return; 497 if (!(devsw(dumpdev)->d_dump)) 498 return; 499 dumpsize = Maxmem; 500 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 501 printf("dump "); 502 error = (*devsw(dumpdev)->d_dump)(dumpdev); 503 if (error == 0) { 504 printf("succeeded\n"); 505 return; 506 } 507 printf("failed, reason: "); 508 switch (error) { 509 case ENODEV: 510 printf("device doesn't support a dump routine\n"); 511 break; 512 513 case ENXIO: 514 printf("device bad\n"); 515 break; 516 517 case EFAULT: 518 printf("device not ready\n"); 519 break; 520 521 case EINVAL: 522 printf("area improper\n"); 523 break; 524 525 case EIO: 526 printf("i/o error\n"); 527 break; 528 529 case EINTR: 530 printf("aborted from console\n"); 531 break; 532 533 default: 534 printf("unknown, error = %d\n", error); 535 break; 536 } 537} 538 539int 540dumpstatus(vm_offset_t addr, long count) 541{ 542 int c; 543 544 if (addr % (1024 * 1024) == 0) { 545#ifdef HW_WDOG 546 if (wdog_tickler) 547 (*wdog_tickler)(); 548#endif 549 printf("%ld ", count / (1024 * 1024)); 550 } 551 552 if ((c = cncheckc()) == 0x03) 553 return -1; 554 else if (c != -1) 555 printf("[CTRL-C to abort] "); 556 557 return 0; 558} 559 560#ifdef SMP 561static u_int panic_cpu = NOCPU; 562#endif 563 564/* 565 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 566 * and then reboots. If we are called twice, then we avoid trying to sync 567 * the disks as this often leads to recursive panics. 568 */ 569void 570panic(const char *fmt, ...) 571{ 572 int bootopt; 573 va_list ap; 574 static char buf[256]; 575 576#ifdef SMP 577 /* 578 * We don't want multiple CPU's to panic at the same time, so we 579 * use panic_cpu as a simple spinlock. We have to keep checking 580 * panic_cpu if we are spinning in case the panic on the first 581 * CPU is canceled. 582 */ 583 if (panic_cpu != PCPU_GET(cpuid)) 584 while (atomic_cmpset_int(&panic_cpu, NOCPU, 585 PCPU_GET(cpuid)) == 0) 586 while (panic_cpu != NOCPU) 587 ; /* nothing */ 588#endif 589 590 bootopt = RB_AUTOBOOT | RB_DUMP; 591 if (panicstr) 592 bootopt |= RB_NOSYNC; 593 else 594 panicstr = fmt; 595 596 va_start(ap, fmt); 597 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 598 if (panicstr == fmt) 599 panicstr = buf; 600 va_end(ap); 601 printf("panic: %s\n", buf); 602#ifdef SMP 603 /* two separate prints in case of an unmapped page and trap */ 604 printf("cpuid = %d; ", PCPU_GET(cpuid)); 605#ifdef APIC_IO 606 printf("lapic.id = %08x\n", lapic.id); 607#endif 608#endif 609 610#if defined(DDB) 611 if (debugger_on_panic) 612 Debugger ("panic"); 613#ifdef RESTARTABLE_PANICS 614 /* See if the user aborted the panic, in which case we continue. */ 615 if (panicstr == NULL) { 616#ifdef SMP 617 atomic_store_rel_int(&panic_cpu, NOCPU); 618#endif 619 return; 620 } 621#endif 622#endif 623 boot(bootopt); 624} 625 626/* 627 * Support for poweroff delay. 628 */ 629#ifndef POWEROFF_DELAY 630# define POWEROFF_DELAY 5000 631#endif 632static int poweroff_delay = POWEROFF_DELAY; 633 634SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 635 &poweroff_delay, 0, ""); 636 637static void 638poweroff_wait(void *junk, int howto) 639{ 640 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 641 return; 642 DELAY(poweroff_delay * 1000); 643} 644 645/* 646 * Some system processes (e.g. syncer) need to be stopped at appropriate 647 * points in their main loops prior to a system shutdown, so that they 648 * won't interfere with the shutdown process (e.g. by holding a disk buf 649 * to cause sync to fail). For each of these system processes, register 650 * shutdown_kproc() as a handler for one of shutdown events. 651 */ 652static int kproc_shutdown_wait = 60; 653SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 654 &kproc_shutdown_wait, 0, ""); 655 656void 657kproc_shutdown(void *arg, int howto) 658{ 659 struct proc *p; 660 int error; 661 662 if (panicstr) 663 return; 664 665 p = (struct proc *)arg; 666 printf("Waiting (max %d seconds) for system process `%s' to stop...", 667 kproc_shutdown_wait, p->p_comm); 668 error = kthread_suspend(p, kproc_shutdown_wait * hz); 669 670 if (error == EWOULDBLOCK) 671 printf("timed out\n"); 672 else 673 printf("stopped\n"); 674} 675