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: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon Exp $ 40 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.62 2008/01/05 13:23:48 corecode Exp $ 41 */ 42 43 #include "opt_ddb.h" 44 #include "opt_ddb_trace.h" 45 #include "opt_hw_wdog.h" 46 #include "opt_panic.h" 47 #include "opt_show_busybufs.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/eventhandler.h> 52 #include <sys/buf.h> 53 #include <sys/diskslice.h> 54 #include <sys/reboot.h> 55 #include <sys/proc.h> 56 #include <sys/priv.h> 57 #include <sys/fcntl.h> /* FREAD */ 58 #include <sys/stat.h> /* S_IFCHR */ 59 #include <sys/vnode.h> 60 #include <sys/kernel.h> 61 #include <sys/kthread.h> 62 #include <sys/malloc.h> 63 #include <sys/mount.h> 64 #include <sys/queue.h> 65 #include <sys/sysctl.h> 66 #include <sys/vkernel.h> 67 #include <sys/conf.h> 68 #include <sys/sysproto.h> 69 #include <sys/device.h> 70 #include <sys/cons.h> 71 #include <sys/shm.h> 72 #include <sys/kern_syscall.h> 73 #include <vm/vm_map.h> 74 #include <vm/pmap.h> 75 76 #include <sys/thread2.h> 77 #include <sys/buf2.h> 78 79 #include <machine/pcb.h> 80 #include <machine/clock.h> 81 #include <machine/md_var.h> 82 #include <machine/smp.h> /* smp_active_mask, cpuid */ 83 #include <machine/vmparam.h> 84 85 #include <sys/signalvar.h> 86 87 #include <sys/wdog.h> 88 #include <dev/misc/gpio/gpio.h> 89 90 #ifndef PANIC_REBOOT_WAIT_TIME 91 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 92 #endif 93 94 /* 95 * Note that stdarg.h and the ANSI style va_start macro is used for both 96 * ANSI and traditional C compilers. We use the machine version to stay 97 * within the confines of the kernel header files. 98 */ 99 #include <machine/stdarg.h> 100 101 #ifdef DDB 102 #include <ddb/ddb.h> 103 #ifdef DDB_UNATTENDED 104 int debugger_on_panic = 0; 105 #else 106 int debugger_on_panic = 1; 107 #endif 108 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 109 &debugger_on_panic, 0, "Run debugger on kernel panic"); 110 111 #ifdef DDB_TRACE 112 int trace_on_panic = 1; 113 #else 114 int trace_on_panic = 0; 115 #endif 116 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, 117 &trace_on_panic, 0, "Print stack trace on kernel panic"); 118 #endif 119 120 static int sync_on_panic = 0; 121 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, 122 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 123 124 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 125 126 #ifdef HW_WDOG 127 /* 128 * If there is a hardware watchdog, point this at the function needed to 129 * hold it off. 130 * It's needed when the kernel needs to do some lengthy operations. 131 * e.g. in wd.c when dumping core.. It's most annoying to have 132 * your precious core-dump only half written because the wdog kicked in. 133 */ 134 watchdog_tickle_fn wdog_tickler = NULL; 135 #endif /* HW_WDOG */ 136 137 /* 138 * Variable panicstr contains argument to first call to panic; used as flag 139 * to indicate that the kernel has already called panic. 140 */ 141 const char *panicstr; 142 143 int dumping; /* system is dumping */ 144 #ifdef SMP 145 u_int panic_cpu_interlock; /* panic interlock */ 146 globaldata_t panic_cpu_gd; /* which cpu took the panic */ 147 #endif 148 149 int bootverbose = 0; /* note: assignment to force non-bss */ 150 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, 151 &bootverbose, 0, "Verbose kernel messages"); 152 153 int cold = 1; /* note: assignment to force non-bss */ 154 int dumplo; /* OBSOLETE - savecore compat */ 155 u_int64_t dumplo64; 156 157 static void boot (int) __dead2; 158 static void dumpsys (void); 159 static int setdumpdev (cdev_t dev); 160 static void poweroff_wait (void *, int); 161 static void print_uptime (void); 162 static void shutdown_halt (void *junk, int howto); 163 static void shutdown_panic (void *junk, int howto); 164 static void shutdown_reset (void *junk, int howto); 165 static int shutdown_busycount1(struct buf *bp, void *info); 166 static int shutdown_busycount2(struct buf *bp, void *info); 167 static void shutdown_cleanup_proc(struct proc *p); 168 169 /* register various local shutdown events */ 170 static void 171 shutdown_conf(void *unused) 172 { 173 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 174 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 175 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 176 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 177 } 178 179 SYSINIT(shutdown_conf, SI_BOOT2_MACHDEP, SI_ORDER_ANY, shutdown_conf, NULL) 180 181 /* ARGSUSED */ 182 183 /* 184 * The system call that results in a reboot 185 */ 186 int 187 sys_reboot(struct reboot_args *uap) 188 { 189 struct thread *td = curthread; 190 int error; 191 192 if ((error = priv_check(td, PRIV_REBOOT))) 193 return (error); 194 195 boot(uap->opt); 196 return (0); 197 } 198 199 /* 200 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 201 */ 202 static int shutdown_howto = 0; 203 204 void 205 shutdown_nice(int howto) 206 { 207 shutdown_howto = howto; 208 209 /* Send a signal to init(8) and have it shutdown the world */ 210 if (initproc != NULL) { 211 ksignal(initproc, SIGINT); 212 } else { 213 /* No init(8) running, so simply reboot */ 214 boot(RB_NOSYNC); 215 } 216 return; 217 } 218 static int waittime = -1; 219 static struct thread *dumpthread; 220 static struct pcb dumppcb; 221 222 static void 223 print_uptime(void) 224 { 225 int f; 226 struct timespec ts; 227 228 getnanouptime(&ts); 229 kprintf("Uptime: "); 230 f = 0; 231 if (ts.tv_sec >= 86400) { 232 kprintf("%ldd", ts.tv_sec / 86400); 233 ts.tv_sec %= 86400; 234 f = 1; 235 } 236 if (f || ts.tv_sec >= 3600) { 237 kprintf("%ldh", ts.tv_sec / 3600); 238 ts.tv_sec %= 3600; 239 f = 1; 240 } 241 if (f || ts.tv_sec >= 60) { 242 kprintf("%ldm", ts.tv_sec / 60); 243 ts.tv_sec %= 60; 244 f = 1; 245 } 246 kprintf("%lds\n", ts.tv_sec); 247 } 248 249 /* 250 * Go through the rigmarole of shutting down.. 251 * this used to be in machdep.c but I'll be dammned if I could see 252 * anything machine dependant in it. 253 */ 254 static void 255 boot(int howto) 256 { 257 /* 258 * Get rid of any user scheduler baggage and then give 259 * us a high priority. 260 */ 261 if (curthread->td_release) 262 curthread->td_release(curthread); 263 lwkt_setpri_self(TDPRI_MAX); 264 265 /* collect extra flags that shutdown_nice might have set */ 266 howto |= shutdown_howto; 267 268 #ifdef SMP 269 /* 270 * We really want to shutdown on the BSP. Subsystems such as ACPI 271 * can't power-down the box otherwise. 272 */ 273 if (smp_active_mask > 1) { 274 kprintf("boot() called on cpu#%d\n", mycpu->gd_cpuid); 275 } 276 if (panicstr == NULL && mycpu->gd_cpuid != 0) { 277 kprintf("Switching to cpu #0 for shutdown\n"); 278 lwkt_setcpu_self(globaldata_find(0)); 279 } 280 #endif 281 /* 282 * Do any callouts that should be done BEFORE syncing the filesystems. 283 */ 284 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 285 286 /* 287 * Try to get rid of any remaining FS references. The calling 288 * process, proc0, and init may still hold references. The 289 * VFS cache subsystem may still hold a root reference to root. 290 * 291 * XXX this needs work. We really need to SIGSTOP all remaining 292 * processes in order to avoid blowups due to proc0's filesystem 293 * references going away. For now just make sure that the init 294 * process is stopped. 295 */ 296 if (panicstr == NULL) { 297 shutdown_cleanup_proc(curproc); 298 shutdown_cleanup_proc(&proc0); 299 if (initproc) { 300 if (initproc != curproc) { 301 ksignal(initproc, SIGSTOP); 302 tsleep(boot, 0, "shutdn", hz / 20); 303 } 304 shutdown_cleanup_proc(initproc); 305 } 306 vfs_cache_setroot(NULL, NULL); 307 } 308 309 /* 310 * Now sync filesystems 311 */ 312 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 313 int iter, nbusy, pbusy; 314 315 waittime = 0; 316 kprintf("\nsyncing disks... "); 317 318 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 319 320 /* 321 * With soft updates, some buffers that are 322 * written will be remarked as dirty until other 323 * buffers are written. 324 */ 325 for (iter = pbusy = 0; iter < 20; iter++) { 326 nbusy = scan_all_buffers(shutdown_busycount1, NULL); 327 if (nbusy == 0) 328 break; 329 kprintf("%d ", nbusy); 330 if (nbusy < pbusy) 331 iter = 0; 332 pbusy = nbusy; 333 /* 334 * XXX: 335 * Process soft update work queue if buffers don't sync 336 * after 6 iterations by permitting the syncer to run. 337 */ 338 if (iter > 5) 339 bio_ops_sync(NULL); 340 341 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 342 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1); 343 } 344 kprintf("\n"); 345 /* 346 * Count only busy local buffers to prevent forcing 347 * a fsck if we're just a client of a wedged NFS server 348 */ 349 nbusy = scan_all_buffers(shutdown_busycount2, NULL); 350 if (nbusy) { 351 /* 352 * Failed to sync all blocks. Indicate this and don't 353 * unmount filesystems (thus forcing an fsck on reboot). 354 */ 355 kprintf("giving up on %d buffers\n", nbusy); 356 #ifdef DDB 357 Debugger("busy buffer problem"); 358 #endif /* DDB */ 359 tsleep(boot, 0, "shutdn", hz * 5 + 1); 360 } else { 361 kprintf("done\n"); 362 /* 363 * Unmount filesystems 364 */ 365 if (panicstr == NULL) 366 vfs_unmountall(); 367 } 368 tsleep(boot, 0, "shutdn", hz / 10 + 1); 369 } 370 371 print_uptime(); 372 373 /* 374 * Dump before doing post_sync shutdown ops 375 */ 376 crit_enter(); 377 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 378 dumpsys(); 379 380 /* 381 * Ok, now do things that assume all filesystem activity has 382 * been completed. This will also call the device shutdown 383 * methods. 384 */ 385 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 386 387 /* Now that we're going to really halt the system... */ 388 EVENTHANDLER_INVOKE(shutdown_final, howto); 389 390 for(;;) ; /* safety against shutdown_reset not working */ 391 /* NOTREACHED */ 392 } 393 394 static int 395 shutdown_busycount1(struct buf *bp, void *info) 396 { 397 if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0) 398 return(1); 399 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) 400 return (1); 401 return (0); 402 } 403 404 static int 405 shutdown_busycount2(struct buf *bp, void *info) 406 { 407 if (((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp)) || 408 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 409 /* 410 * Only count buffers undergoing write I/O 411 * on the related vnode. 412 */ 413 if (bp->b_vp == NULL || 414 bio_track_active(&bp->b_vp->v_track_write) == 0) { 415 return (0); 416 } 417 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 418 kprintf( 419 "%p dev:?, flags:%08x, loffset:%lld, doffset:%lld\n", 420 bp, 421 bp->b_flags, bp->b_loffset, 422 bp->b_bio2.bio_offset); 423 #endif 424 return(1); 425 } 426 return(0); 427 } 428 429 /* 430 * If the shutdown was a clean halt, behave accordingly. 431 */ 432 static void 433 shutdown_halt(void *junk, int howto) 434 { 435 if (howto & RB_HALT) { 436 kprintf("\n"); 437 kprintf("The operating system has halted.\n"); 438 #ifdef _KERNEL_VIRTUAL 439 cpu_halt(); 440 #else 441 kprintf("Please press any key to reboot.\n\n"); 442 switch (cngetc()) { 443 case -1: /* No console, just die */ 444 cpu_halt(); 445 /* NOTREACHED */ 446 default: 447 howto &= ~RB_HALT; 448 break; 449 } 450 #endif 451 } 452 } 453 454 /* 455 * Check to see if the system paniced, pause and then reboot 456 * according to the specified delay. 457 */ 458 static void 459 shutdown_panic(void *junk, int howto) 460 { 461 int loop; 462 463 if (howto & RB_DUMP) { 464 if (PANIC_REBOOT_WAIT_TIME != 0) { 465 if (PANIC_REBOOT_WAIT_TIME != -1) { 466 kprintf("Automatic reboot in %d seconds - " 467 "press a key on the console to abort\n", 468 PANIC_REBOOT_WAIT_TIME); 469 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 470 loop > 0; --loop) { 471 DELAY(1000 * 100); /* 1/10th second */ 472 /* Did user type a key? */ 473 if (cncheckc() != -1) 474 break; 475 } 476 if (!loop) 477 return; 478 } 479 } else { /* zero time specified - reboot NOW */ 480 return; 481 } 482 kprintf("--> Press a key on the console to reboot,\n"); 483 kprintf("--> or switch off the system now.\n"); 484 cngetc(); 485 } 486 } 487 488 /* 489 * Everything done, now reset 490 */ 491 static void 492 shutdown_reset(void *junk, int howto) 493 { 494 kprintf("Rebooting...\n"); 495 DELAY(1000000); /* wait 1 sec for kprintf's to complete and be read */ 496 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 497 cpu_reset(); 498 /* NOTREACHED */ /* assuming reset worked */ 499 } 500 501 /* 502 * Try to remove FS references in the specified process. This function 503 * is used during shutdown 504 */ 505 static 506 void 507 shutdown_cleanup_proc(struct proc *p) 508 { 509 struct filedesc *fdp; 510 struct vmspace *vm; 511 512 if (p == NULL) 513 return; 514 if ((fdp = p->p_fd) != NULL) { 515 kern_closefrom(0); 516 if (fdp->fd_cdir) { 517 cache_drop(&fdp->fd_ncdir); 518 vrele(fdp->fd_cdir); 519 fdp->fd_cdir = NULL; 520 } 521 if (fdp->fd_rdir) { 522 cache_drop(&fdp->fd_nrdir); 523 vrele(fdp->fd_rdir); 524 fdp->fd_rdir = NULL; 525 } 526 if (fdp->fd_jdir) { 527 cache_drop(&fdp->fd_njdir); 528 vrele(fdp->fd_jdir); 529 fdp->fd_jdir = NULL; 530 } 531 } 532 if (p->p_vkernel) 533 vkernel_exit(p); 534 if (p->p_textvp) { 535 vrele(p->p_textvp); 536 p->p_textvp = NULL; 537 } 538 vm = p->p_vmspace; 539 if (vm != NULL) { 540 pmap_remove_pages(vmspace_pmap(vm), 541 VM_MIN_USER_ADDRESS, 542 VM_MAX_USER_ADDRESS); 543 vm_map_remove(&vm->vm_map, 544 VM_MIN_USER_ADDRESS, 545 VM_MAX_USER_ADDRESS); 546 } 547 } 548 549 /* 550 * Magic number for savecore 551 * 552 * exported (symorder) and used at least by savecore(8) 553 * 554 * Mark it as used so that gcc doesn't optimize it away. 555 */ 556 __attribute__((__used__)) 557 static u_long const dumpmag = 0x8fca0101UL; 558 559 static int dumpsize = 0; /* also for savecore */ 560 561 static int dodump = 1; 562 563 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 564 "Try to perform coredump on kernel panic"); 565 566 static int 567 setdumpdev(cdev_t dev) 568 { 569 struct partinfo pinfo; 570 u_int64_t newdumplo; 571 int error; 572 int doopen; 573 574 if (dev == NULL) { 575 dumpdev = dev; 576 return (0); 577 } 578 bzero(&pinfo, sizeof(pinfo)); 579 580 /* 581 * We have to open the device before we can perform ioctls on it, 582 * or the slice/label data may not be present. Device opens are 583 * usually tracked by specfs, but the dump device can be set in 584 * early boot and may not be open so this is somewhat of a hack. 585 */ 586 doopen = (dev->si_sysref.refcnt == 1); 587 if (doopen) { 588 error = dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred); 589 if (error) 590 return (error); 591 } 592 error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0, 593 proc0.p_ucred, NULL); 594 if (doopen) 595 dev_dclose(dev, FREAD, S_IFCHR); 596 if (error || pinfo.media_blocks == 0 || pinfo.media_blksize == 0) 597 return (ENXIO); 598 599 newdumplo = pinfo.media_blocks - 600 ((u_int64_t)Maxmem * PAGE_SIZE / DEV_BSIZE); 601 if ((int64_t)newdumplo < (int64_t)pinfo.reserved_blocks) 602 return (ENOSPC); 603 dumpdev = dev; 604 dumplo64 = newdumplo; 605 return (0); 606 } 607 608 609 /* ARGSUSED */ 610 static void dump_conf (void *dummy); 611 static void 612 dump_conf(void *dummy) 613 { 614 char *path; 615 cdev_t dev; 616 617 path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK); 618 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { 619 dev = kgetdiskbyname(path); 620 if (dev != NULL) 621 dumpdev = dev; 622 } 623 kfree(path, M_TEMP); 624 if (setdumpdev(dumpdev) != 0) 625 dumpdev = NULL; 626 } 627 628 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 629 630 static int 631 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 632 { 633 int error; 634 udev_t ndumpdev; 635 636 ndumpdev = dev2udev(dumpdev); 637 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 638 if (error == 0 && req->newptr != NULL) 639 error = setdumpdev(udev2dev(ndumpdev, 0)); 640 return (error); 641 } 642 643 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 644 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,udev_t", ""); 645 646 /* 647 * Doadump comes here after turning off memory management and 648 * getting on the dump stack, either when called above, or by 649 * the auto-restart code. 650 */ 651 static void 652 dumpsys(void) 653 { 654 int error; 655 656 savectx(&dumppcb); 657 dumpthread = curthread; 658 if (dumping++) { 659 kprintf("Dump already in progress, bailing...\n"); 660 return; 661 } 662 if (!dodump) 663 return; 664 if (dumpdev == NULL) 665 return; 666 dumpsize = Maxmem; 667 kprintf("\ndumping to dev %s, blockno %lld\n", 668 devtoname(dumpdev), 669 (long long)dumplo64); 670 kprintf("dump "); 671 error = dev_ddump(dumpdev); 672 if (error == 0) { 673 kprintf("succeeded\n"); 674 return; 675 } 676 kprintf("failed, reason: "); 677 switch (error) { 678 case ENOSYS: 679 case ENODEV: 680 kprintf("device doesn't support a dump routine\n"); 681 break; 682 683 case ENXIO: 684 kprintf("device bad\n"); 685 break; 686 687 case EFAULT: 688 kprintf("device not ready\n"); 689 break; 690 691 case EINVAL: 692 kprintf("area improper\n"); 693 break; 694 695 case EIO: 696 kprintf("i/o error\n"); 697 break; 698 699 case EINTR: 700 kprintf("aborted from console\n"); 701 break; 702 703 default: 704 kprintf("unknown, error = %d\n", error); 705 break; 706 } 707 } 708 709 int 710 dumpstatus(vm_offset_t addr, off_t count) 711 { 712 int c; 713 714 if (addr % (1024 * 1024) == 0) { 715 #ifdef HW_WDOG 716 if (wdog_tickler) 717 (*wdog_tickler)(); 718 #endif 719 kprintf("%ld ", (long)(count / (1024 * 1024))); 720 } 721 722 if ((c = cncheckc()) == 0x03) 723 return -1; 724 else if (c != -1) 725 kprintf("[CTRL-C to abort] "); 726 727 return 0; 728 } 729 730 /* 731 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 732 * and then reboots. If we are called twice, then we avoid trying to sync 733 * the disks as this often leads to recursive panics. 734 */ 735 void 736 panic(const char *fmt, ...) 737 { 738 int bootopt, newpanic; 739 __va_list ap; 740 static char buf[256]; 741 742 #ifdef SMP 743 /* 744 * If a panic occurs on multiple cpus before the first is able to 745 * halt the other cpus, only one cpu is allowed to take the panic. 746 * Attempt to be verbose about this situation but if the kprintf() 747 * itself panics don't let us overrun the kernel stack. 748 * 749 * Be very nasty about descheduling our thread at the lowest 750 * level possible in an attempt to freeze the thread without 751 * inducing further panics. 752 * 753 * Bumping gd_trap_nesting_level will also bypass assertions in 754 * lwkt_switch() and allow us to switch away even if we are a 755 * FAST interrupt or IPI. 756 */ 757 if (atomic_poll_acquire_int(&panic_cpu_interlock)) { 758 panic_cpu_gd = mycpu; 759 } else if (panic_cpu_gd != mycpu) { 760 crit_enter(); 761 ++mycpu->gd_trap_nesting_level; 762 if (mycpu->gd_trap_nesting_level < 25) { 763 kprintf("SECONDARY PANIC ON CPU %d THREAD %p\n", 764 mycpu->gd_cpuid, curthread); 765 } 766 curthread->td_release = NULL; /* be a grinch */ 767 for (;;) { 768 lwkt_deschedule_self(curthread); 769 lwkt_switch(); 770 } 771 /* NOT REACHED */ 772 /* --mycpu->gd_trap_nesting_level */ 773 /* crit_exit() */ 774 } 775 #endif 776 bootopt = RB_AUTOBOOT | RB_DUMP; 777 if (sync_on_panic == 0) 778 bootopt |= RB_NOSYNC; 779 newpanic = 0; 780 if (panicstr) 781 bootopt |= RB_NOSYNC; 782 else { 783 panicstr = fmt; 784 newpanic = 1; 785 } 786 787 __va_start(ap, fmt); 788 kvsnprintf(buf, sizeof(buf), fmt, ap); 789 if (panicstr == fmt) 790 panicstr = buf; 791 __va_end(ap); 792 kprintf("panic: %s\n", buf); 793 #ifdef SMP 794 /* two separate prints in case of an unmapped page and trap */ 795 kprintf("mp_lock = %08x; ", mp_lock); 796 kprintf("cpuid = %d\n", mycpu->gd_cpuid); 797 #endif 798 799 #if (NGPIO > 0) && defined(ERROR_LED_ON_PANIC) 800 led_switch("error", 1); 801 #endif 802 803 #if defined(WDOG_DISABLE_ON_PANIC) && defined(WATCHDOG_ENABLE) 804 wdog_disable(); 805 #endif 806 807 #if defined(DDB) 808 if (newpanic && trace_on_panic) 809 print_backtrace(); 810 if (debugger_on_panic) 811 Debugger("panic"); 812 #endif 813 boot(bootopt); 814 } 815 816 /* 817 * Support for poweroff delay. 818 */ 819 #ifndef POWEROFF_DELAY 820 # define POWEROFF_DELAY 5000 821 #endif 822 static int poweroff_delay = POWEROFF_DELAY; 823 824 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 825 &poweroff_delay, 0, ""); 826 827 static void 828 poweroff_wait(void *junk, int howto) 829 { 830 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 831 return; 832 DELAY(poweroff_delay * 1000); 833 } 834 835 /* 836 * Some system processes (e.g. syncer) need to be stopped at appropriate 837 * points in their main loops prior to a system shutdown, so that they 838 * won't interfere with the shutdown process (e.g. by holding a disk buf 839 * to cause sync to fail). For each of these system processes, register 840 * shutdown_kproc() as a handler for one of shutdown events. 841 */ 842 static int kproc_shutdown_wait = 60; 843 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 844 &kproc_shutdown_wait, 0, ""); 845 846 void 847 shutdown_kproc(void *arg, int howto) 848 { 849 struct thread *td; 850 struct proc *p; 851 int error; 852 853 if (panicstr) 854 return; 855 856 td = (struct thread *)arg; 857 if ((p = td->td_proc) != NULL) { 858 kprintf("Waiting (max %d seconds) for system process `%s' to stop...", 859 kproc_shutdown_wait, p->p_comm); 860 } else { 861 kprintf("Waiting (max %d seconds) for system thread %s to stop...", 862 kproc_shutdown_wait, td->td_comm); 863 } 864 error = suspend_kproc(td, kproc_shutdown_wait * hz); 865 866 if (error == EWOULDBLOCK) 867 kprintf("timed out\n"); 868 else 869 kprintf("stopped\n"); 870 } 871