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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 35 * $FreeBSD: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon Exp $ 36 */ 37 38 #include "opt_ddb.h" 39 #include "opt_ddb_trace.h" 40 #include "opt_panic.h" 41 #include "use_gpio.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/eventhandler.h> 46 #include <sys/buf.h> 47 #include <sys/disk.h> 48 #include <sys/diskslice.h> 49 #include <sys/reboot.h> 50 #include <sys/proc.h> 51 #include <sys/caps.h> 52 #include <sys/fcntl.h> /* FREAD */ 53 #include <sys/stat.h> /* S_IFCHR */ 54 #include <sys/vnode.h> 55 #include <sys/kernel.h> 56 #include <sys/kerneldump.h> 57 #include <sys/kthread.h> 58 #include <sys/malloc.h> 59 #include <sys/mount.h> 60 #include <sys/queue.h> 61 #include <sys/sysctl.h> 62 #include <sys/vkernel.h> 63 #include <sys/conf.h> 64 #include <sys/sysmsg.h> 65 #include <sys/device.h> 66 #include <sys/cons.h> 67 #include <sys/kbio.h> 68 #include <sys/shm.h> 69 #include <sys/kern_syscall.h> 70 #include <vm/vm_map.h> 71 #include <vm/pmap.h> 72 73 #include <sys/thread2.h> 74 #include <sys/buf2.h> 75 #include <sys/mplock2.h> 76 77 #include <machine/cpu.h> 78 #include <machine/clock.h> 79 #include <machine/md_var.h> 80 #include <machine/smp.h> /* smp_active_mask, cpuid */ 81 #include <machine/vmparam.h> 82 #include <machine/thread.h> 83 84 #include <sys/signalvar.h> 85 86 #if defined(WDOG_DISABLE_ON_PANIC) 87 #include <sys/wdog.h> 88 #endif 89 #include <dev/acpica/acpi_pvpanic/panic_notifier.h> 90 #if (NGPIO > 0) && defined(ERROR_LED_ON_PANIC) 91 #include <dev/misc/gpio/gpio.h> 92 #endif 93 94 #ifndef PANIC_REBOOT_WAIT_TIME 95 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 96 #endif 97 98 /* 99 * Note that stdarg.h and the ANSI style va_start macro is used for both 100 * ANSI and traditional C compilers. We use the machine version to stay 101 * within the confines of the kernel header files. 102 */ 103 #include <machine/stdarg.h> 104 105 #ifdef DDB 106 #include <ddb/ddb.h> 107 #ifdef DDB_UNATTENDED 108 int debugger_on_panic = 0; 109 #else 110 int debugger_on_panic = 1; 111 #endif 112 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 113 &debugger_on_panic, 0, "Run debugger on kernel panic"); 114 115 #ifdef DDB_TRACE 116 int trace_on_panic = 1; 117 #else 118 int trace_on_panic = 0; 119 #endif 120 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, 121 &trace_on_panic, 0, "Print stack trace on kernel panic"); 122 #endif 123 124 static int sync_on_panic = 0; 125 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, 126 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 127 128 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 129 130 /* 131 * Variable panicstr contains argument to first call to panic; used as flag 132 * to indicate that the kernel has already called panic. 133 */ 134 const char *panicstr; 135 136 __read_mostly int dumping; /* system is dumping */ 137 static struct dumperinfo dumper; /* selected dumper */ 138 139 __read_frequently globaldata_t panic_cpu_gd; /* used in lock assertion */ 140 struct lwkt_tokref panic_tokens[LWKT_MAXTOKENS]; 141 int panic_tokens_count; 142 143 __read_mostly int bootverbose = 0; /* note: assignment to force non-bss */ 144 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, 145 &bootverbose, 0, "Verbose kernel messages"); 146 147 int cold = 1; /* note: assignment to force non-bss */ 148 int dumplo; /* OBSOLETE - savecore compat */ 149 u_int64_t dumplo64; 150 151 static void boot (int) __dead2; 152 static int setdumpdev (cdev_t dev); 153 static void poweroff_wait (void *, int); 154 static void print_uptime (void); 155 static void shutdown_halt (void *junk, int howto); 156 static void shutdown_panic (void *junk, int howto); 157 static void shutdown_reset (void *junk, int howto); 158 static int shutdown_busycount1(struct buf *bp, void *info); 159 static int shutdown_busycount2(struct buf *bp, void *info); 160 static void shutdown_cleanup_proc(struct proc *p); 161 162 /* register various local shutdown events */ 163 static void 164 shutdown_conf(void *unused) 165 { 166 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 167 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 168 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 169 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 170 } 171 172 SYSINIT(shutdown_conf, SI_BOOT2_MACHDEP, SI_ORDER_ANY, shutdown_conf, NULL); 173 174 /* ARGSUSED */ 175 176 /* 177 * The system call that results in a reboot 178 * 179 * MPALMOSTSAFE 180 */ 181 int 182 sys_reboot(struct sysmsg *sysmsg, const struct reboot_args *uap) 183 { 184 int error; 185 186 if ((error = caps_priv_check_self(SYSCAP_NOREBOOT))) 187 return (error); 188 189 get_mplock(); 190 boot(uap->opt); 191 rel_mplock(); 192 return (0); 193 } 194 195 /* 196 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 197 */ 198 static int shutdown_howto = 0; 199 200 void 201 shutdown_nice(int howto) 202 { 203 shutdown_howto = howto; 204 205 /* Send a signal to init(8) and have it shutdown the world */ 206 if (initproc != NULL) { 207 ksignal(initproc, SIGINT); 208 } else { 209 /* No init(8) running, so simply reboot */ 210 boot(RB_NOSYNC); 211 } 212 return; 213 } 214 static int waittime = -1; 215 struct pcb dumppcb; 216 struct thread *dumpthread; 217 218 static void 219 print_uptime(void) 220 { 221 int f; 222 struct timespec ts; 223 224 getnanouptime(&ts); 225 kprintf("Uptime: "); 226 f = 0; 227 if (ts.tv_sec >= 86400) { 228 kprintf("%ldd", ts.tv_sec / 86400); 229 ts.tv_sec %= 86400; 230 f = 1; 231 } 232 if (f || ts.tv_sec >= 3600) { 233 kprintf("%ldh", ts.tv_sec / 3600); 234 ts.tv_sec %= 3600; 235 f = 1; 236 } 237 if (f || ts.tv_sec >= 60) { 238 kprintf("%ldm", ts.tv_sec / 60); 239 ts.tv_sec %= 60; 240 f = 1; 241 } 242 kprintf("%lds\n", ts.tv_sec); 243 } 244 245 /* 246 * Go through the rigmarole of shutting down.. 247 * this used to be in machdep.c but I'll be dammned if I could see 248 * anything machine dependant in it. 249 */ 250 static void 251 boot(int howto) 252 { 253 /* 254 * Get rid of any user scheduler baggage and then give 255 * us a high priority. 256 */ 257 if (curthread->td_release) 258 curthread->td_release(curthread); 259 lwkt_setpri_self(TDPRI_MAX); 260 261 /* collect extra flags that shutdown_nice might have set */ 262 howto |= shutdown_howto; 263 264 /* 265 * We really want to shutdown on the BSP. Subsystems such as ACPI 266 * can't power-down the box otherwise. 267 */ 268 if (!CPUMASK_ISUP(smp_active_mask)) { 269 kprintf("boot() called on cpu#%d\n", mycpu->gd_cpuid); 270 } 271 if (panicstr == NULL && mycpu->gd_cpuid != 0) { 272 kprintf("Switching to cpu #0 for shutdown\n"); 273 lwkt_setcpu_self(globaldata_find(0)); 274 } 275 /* 276 * Do any callouts that should be done BEFORE syncing the filesystems. 277 */ 278 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 279 280 /* 281 * Try to get rid of any remaining FS references. The calling 282 * process, proc0, and init may still hold references. The 283 * VFS cache subsystem may still hold a root reference to root. 284 * 285 * XXX this needs work. We really need to SIGSTOP all remaining 286 * processes in order to avoid blowups due to proc0's filesystem 287 * references going away. For now just make sure that the init 288 * process is stopped. 289 */ 290 if (panicstr == NULL) { 291 shutdown_cleanup_proc(curproc); 292 shutdown_cleanup_proc(&proc0); 293 if (initproc) { 294 if (initproc != curproc) { 295 ksignal(initproc, SIGSTOP); 296 tsleep(boot, 0, "shutdn", hz / 20); 297 } 298 shutdown_cleanup_proc(initproc); 299 } 300 vfs_cache_setroot(NULL, NULL); 301 } 302 303 /* 304 * Now sync filesystems 305 */ 306 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 307 int iter, nbusy, pbusy; 308 int zcount; 309 310 waittime = 0; 311 zcount = 0; 312 kprintf("\nsyncing disks... "); 313 314 sys_sync(NULL, NULL); 315 316 /* 317 * With soft updates, some buffers that are written will be 318 * remarked as dirty until other buffers are written. 319 * 320 * sys_sync() usually runs asynchronously, to give us a 321 * better chance of syncing the rest of the filesystems when 322 * one or more of them are stuck. 323 */ 324 for (iter = pbusy = 0; iter < 20 + zcount; iter++) { 325 if (iter <= 10) 326 nbusy = scan_all_buffers(shutdown_busycount1, 327 &iter); 328 else 329 nbusy = scan_all_buffers(shutdown_busycount2, 330 &iter); 331 kprintf("%d ", nbusy); 332 if (nbusy == 0) { 333 if (++zcount == 3) 334 break; 335 } else { 336 zcount = 0; 337 } 338 339 /* 340 * There could be a lot to sync, only allow iter to 341 * proceed while there is progress. 342 */ 343 if (nbusy < pbusy) { 344 if (iter > 10) 345 iter = 10; 346 else 347 iter = 0; 348 } 349 pbusy = nbusy; 350 351 /* 352 * XXX: 353 * Process soft update work queue if buffers don't sync 354 * after 6 iterations by permitting the syncer to run. 355 */ 356 if (iter > 5) 357 bio_ops_sync(NULL); 358 359 sys_sync(NULL, NULL); 360 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1); 361 } 362 kprintf("\n"); 363 364 if (zcount < 3) { 365 /* 366 * Failed to sync all blocks. Indicate this and don't 367 * unmount filesystems (thus forcing an fsck on reboot). 368 */ 369 kprintf("giving up on %d buffers\n", nbusy); 370 #ifdef DDB 371 if (debugger_on_panic) 372 Debugger("busy buffer problem"); 373 #endif /* DDB */ 374 tsleep(boot, 0, "shutdn", hz * 5 + 1); 375 } else { 376 kprintf("done\n"); 377 378 /* 379 * Unmount filesystems 380 */ 381 if (panicstr == NULL) 382 vfs_unmountall(1); 383 } 384 tsleep(boot, 0, "shutdn", hz / 10 + 1); 385 } 386 387 print_uptime(); 388 389 /* 390 * Dump before doing post_sync shutdown ops 391 */ 392 crit_enter(); 393 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) { 394 dumpsys(); 395 } 396 397 /* 398 * Ok, now do things that assume all filesystem activity has 399 * been completed. This will also call the device shutdown 400 * methods. 401 */ 402 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 403 404 /* Now that we're going to really halt the system... */ 405 EVENTHANDLER_INVOKE(shutdown_final, howto); 406 407 for(;;) ; /* safety against shutdown_reset not working */ 408 /* NOTREACHED */ 409 } 410 411 /* 412 * Pass 1 - Figure out if there are any busy or dirty buffers still present. 413 * 414 * We ignore TMPFS mounts in this pass. 415 */ 416 static int 417 shutdown_busycount1(struct buf *bp, void *info __unused) 418 { 419 struct vnode *vp; 420 421 if ((vp = bp->b_vp) != NULL && vp->v_tag == VT_TMPFS) 422 return (0); 423 if ((bp->b_flags & B_INVAL) == 0 && BUF_LOCKINUSE(bp)) 424 return(1); 425 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) 426 return (1); 427 return (0); 428 } 429 430 /* 431 * Pass 2 - only run after pass 1 has completed or has given up 432 * 433 * We ignore TMPFS, NFS, MFS, and SMBFS mounts in this pass. 434 */ 435 static int 436 shutdown_busycount2(struct buf *bp, void *info) 437 { 438 struct vnode *vp; 439 int *iterp = info; 440 const char *mpath; 441 442 /* 443 * Ignore tmpfs and nfs mounts 444 */ 445 if ((vp = bp->b_vp) != NULL) { 446 if (vp->v_tag == VT_TMPFS) 447 return (0); 448 if (vp->v_tag == VT_NFS) 449 return (0); 450 if (vp->v_tag == VT_MFS) 451 return (0); 452 if (vp->v_tag == VT_SMBFS) 453 return (0); 454 } 455 456 /* 457 * Only count buffers stuck on I/O, ignore everything else 458 */ 459 if (((bp->b_flags & B_INVAL) == 0 && BUF_LOCKINUSE(bp)) || 460 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 461 /* 462 * Only count buffers undergoing write I/O 463 * on the related vnode. 464 */ 465 if (bp->b_vp == NULL || 466 bio_track_active(&bp->b_vp->v_track_write) == 0) { 467 return (0); 468 } 469 if (*iterp > 15) { 470 mpath = "?"; 471 if (bp->b_vp->v_mount) 472 mpath = bp->b_vp->v_mount->mnt_stat.f_mntonname; 473 474 kprintf("%p on %s, flags:%08x, loffset:%jd, " 475 "doffset:%jd\n", 476 bp, 477 mpath, 478 bp->b_flags, 479 (intmax_t)bp->b_loffset, 480 (intmax_t)bp->b_bio2.bio_offset); 481 } 482 return(1); 483 } 484 return(0); 485 } 486 487 /* 488 * If the shutdown was a clean halt, behave accordingly. 489 */ 490 static void 491 shutdown_halt(void *junk, int howto) 492 { 493 if (howto & RB_HALT) { 494 kprintf("\n"); 495 kprintf("The operating system has halted.\n"); 496 #ifdef _KERNEL_VIRTUAL 497 cpu_halt(); 498 #else 499 kprintf("Please press any key to reboot.\n\n"); 500 cnpoll(TRUE); 501 switch (cngetc()) { 502 case -1: /* No console, just die */ 503 cpu_halt(); 504 /* NOTREACHED */ 505 default: 506 howto &= ~RB_HALT; 507 break; 508 } 509 #endif 510 } 511 } 512 513 /* 514 * Check to see if the system paniced, pause and then reboot 515 * according to the specified delay. 516 */ 517 static void 518 shutdown_panic(void *junk, int howto) 519 { 520 int loop; 521 int c; 522 523 if (howto & RB_DUMP) { 524 if (PANIC_REBOOT_WAIT_TIME != 0) { 525 if (PANIC_REBOOT_WAIT_TIME != -1) { 526 kprintf("Automatic reboot in %d seconds - " 527 "press a key on the console to abort\n", 528 PANIC_REBOOT_WAIT_TIME); 529 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 530 loop > 0; --loop) { 531 DELAY(1000 * 100); /* 1/10th second */ 532 /* Did user type a key? */ 533 c = cncheckc(); 534 if (c != -1 && c != NOKEY) 535 break; 536 } 537 if (!loop) 538 return; 539 } 540 } else { /* zero time specified - reboot NOW */ 541 return; 542 } 543 kprintf("--> Press a key on the console to reboot,\n"); 544 kprintf("--> or switch off the system now.\n"); 545 cngetc(); 546 } 547 } 548 549 /* 550 * Everything done, now reset 551 */ 552 static void 553 shutdown_reset(void *junk, int howto) 554 { 555 kprintf("Rebooting...\n"); 556 DELAY(1000000); /* wait 1 sec for kprintf's to complete and be read */ 557 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 558 cpu_reset(); 559 /* NOTREACHED */ /* assuming reset worked */ 560 } 561 562 /* 563 * Try to remove FS references in the specified process. This function 564 * is used during shutdown 565 */ 566 static 567 void 568 shutdown_cleanup_proc(struct proc *p) 569 { 570 struct filedesc *fdp; 571 struct vmspace *vm; 572 573 if (p == NULL) 574 return; 575 if ((fdp = p->p_fd) != NULL) { 576 kern_closefrom(0); 577 if (fdp->fd_cdir) { 578 cache_drop(&fdp->fd_ncdir); 579 vrele(fdp->fd_cdir); 580 fdp->fd_cdir = NULL; 581 } 582 if (fdp->fd_rdir) { 583 cache_drop(&fdp->fd_nrdir); 584 vrele(fdp->fd_rdir); 585 fdp->fd_rdir = NULL; 586 } 587 if (fdp->fd_jdir) { 588 cache_drop(&fdp->fd_njdir); 589 vrele(fdp->fd_jdir); 590 fdp->fd_jdir = NULL; 591 } 592 } 593 if (p->p_vkernel) 594 vkernel_exit(p); 595 if (p->p_textvp) { 596 vrele(p->p_textvp); 597 p->p_textvp = NULL; 598 } 599 if (p->p_textnch.ncp) 600 cache_drop(&p->p_textnch); 601 vm = p->p_vmspace; 602 if (vm != NULL) { 603 pmap_remove_pages(vmspace_pmap(vm), 604 VM_MIN_USER_ADDRESS, 605 VM_MAX_USER_ADDRESS); 606 vm_map_remove(&vm->vm_map, 607 VM_MIN_USER_ADDRESS, 608 VM_MAX_USER_ADDRESS); 609 } 610 } 611 612 /* 613 * Magic number for savecore 614 * 615 * exported (symorder) and used at least by savecore(8) 616 * 617 * Mark it as used so that gcc doesn't optimize it away. 618 */ 619 __attribute__((__used__)) 620 static u_long const dumpmag = 0x8fca0101UL; 621 622 __attribute__((__used__)) 623 static int dumpsize = 0; /* also for savecore */ 624 625 static int dodump = 1; 626 627 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 628 "Try to perform coredump on kernel panic"); 629 630 void 631 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 632 uint64_t dumplen, uint32_t blksz) 633 { 634 bzero(kdh, sizeof(*kdh)); 635 strncpy(kdh->magic, magic, sizeof(kdh->magic)); 636 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 637 kdh->version = htod32(KERNELDUMPVERSION); 638 kdh->architectureversion = htod32(archver); 639 kdh->dumplength = htod64(dumplen); 640 kdh->dumptime = htod64(time_second); 641 kdh->blocksize = htod32(blksz); 642 strncpy(kdh->hostname, hostname, sizeof(kdh->hostname)); 643 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 644 if (panicstr != NULL) 645 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 646 kdh->parity = kerneldump_parity(kdh); 647 } 648 649 static int 650 setdumpdev(cdev_t dev) 651 { 652 int error; 653 int doopen; 654 655 if (dev == NULL) { 656 disk_dumpconf(NULL, 0/*off*/); 657 dumpdev = NULL; 658 return (0); 659 } 660 661 /* 662 * We have to open the device before we can perform ioctls on it, 663 * or the slice/label data may not be present. Device opens are 664 * usually tracked by specfs, but the dump device can be set in 665 * early boot and may not be open so this is somewhat of a hack. 666 */ 667 doopen = (dev->si_sysref.refcnt == 1); 668 if (doopen) { 669 error = dev_dopen(dev, FREAD, S_IFCHR, 670 proc0.p_ucred, NULL, NULL); 671 if (error) 672 return (error); 673 } 674 error = disk_dumpconf(dev, 1/*on*/); 675 if (error == 0) 676 dumpdev = dev; 677 678 return error; 679 } 680 681 /* ARGSUSED */ 682 static void dump_conf (void *dummy); 683 static void 684 dump_conf(void *dummy) 685 { 686 char *path; 687 cdev_t dev; 688 int _dummy; 689 690 path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK); 691 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { 692 /* 693 * Make sure all disk devices created so far have also been 694 * probed, and also make sure that the newly created device 695 * nodes for probed disks are ready, too. 696 * 697 * XXX - Delay an additional 2 seconds to help drivers which 698 * pickup devices asynchronously and are not caught by 699 * CAM's initial probe. 700 */ 701 sync_devs(); 702 tsleep(&_dummy, 0, "syncer", hz*2); 703 704 dev = kgetdiskbyname(path); 705 if (dev != NULL) 706 dumpdev = dev; 707 } 708 kfree(path, M_TEMP); 709 if (setdumpdev(dumpdev) != 0) 710 dumpdev = NULL; 711 } 712 713 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL); 714 715 static int 716 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 717 { 718 int error; 719 dev_t ndumpdev; 720 721 ndumpdev = devid_from_dev(dumpdev); 722 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 723 if (error == 0 && req->newptr != NULL) 724 error = setdumpdev(dev_from_devid(ndumpdev, 0)); 725 return (error); 726 } 727 728 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 729 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,udev_t", ""); 730 731 static struct panicerinfo *panic_notifier; 732 733 int 734 set_panic_notifier(struct panicerinfo *info) 735 { 736 if (info == NULL) 737 panic_notifier = NULL; 738 else if (panic_notifier != NULL) 739 return 1; 740 else 741 panic_notifier = info; 742 743 return 0; 744 } 745 746 /* 747 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 748 * and then reboots. If we are called twice, then we avoid trying to sync 749 * the disks as this often leads to recursive panics. 750 */ 751 void 752 panic(const char *fmt, ...) 753 { 754 int bootopt, newpanic; 755 globaldata_t gd = mycpu; 756 thread_t td = gd->gd_curthread; 757 __va_list ap; 758 static char buf[256]; 759 760 /* 761 * If a panic occurs on multiple cpus before the first is able to 762 * halt the other cpus, only one cpu is allowed to take the panic. 763 * Attempt to be verbose about this situation but if the kprintf() 764 * itself panics don't let us overrun the kernel stack. 765 * 766 * Be very nasty about descheduling our thread at the lowest 767 * level possible in an attempt to freeze the thread without 768 * inducing further panics. 769 * 770 * Bumping gd_trap_nesting_level will also bypass assertions in 771 * lwkt_switch() and allow us to switch away even if we are a 772 * FAST interrupt or IPI. 773 * 774 * The setting of panic_cpu_gd also determines how kprintf() 775 * spin-locks itself. DDB can set panic_cpu_gd as well. 776 */ 777 for (;;) { 778 globaldata_t xgd = panic_cpu_gd; 779 780 /* 781 * Someone else got the panic cpu 782 */ 783 if (xgd && xgd != gd) { 784 crit_enter(); 785 ++mycpu->gd_trap_nesting_level; 786 if (mycpu->gd_trap_nesting_level < 25) { 787 kprintf("SECONDARY PANIC ON CPU %d THREAD %p\n", 788 mycpu->gd_cpuid, td); 789 } 790 td->td_release = NULL; /* be a grinch */ 791 for (;;) { 792 lwkt_deschedule_self(td); 793 lwkt_switch(); 794 } 795 /* NOT REACHED */ 796 /* --mycpu->gd_trap_nesting_level */ 797 /* crit_exit() */ 798 } 799 800 /* 801 * Reentrant panic 802 */ 803 if (xgd && xgd == gd) 804 break; 805 806 /* 807 * We got it 808 */ 809 if (atomic_cmpset_ptr(&panic_cpu_gd, NULL, gd)) 810 break; 811 } 812 /* 813 * Try to get the system into a working state. Save information 814 * we are about to destroy. 815 */ 816 kvcreinitspin(); 817 if (panicstr == NULL) { 818 bcopy(td->td_toks_array, panic_tokens, sizeof(panic_tokens)); 819 panic_tokens_count = td->td_toks_stop - &td->td_toks_base; 820 } 821 lwkt_relalltokens(td); 822 td->td_toks_stop = &td->td_toks_base; 823 if (gd->gd_spinlocks) 824 kprintf("panic with %d spinlocks held\n", gd->gd_spinlocks); 825 gd->gd_spinlocks = 0; 826 827 /* 828 * Setup 829 */ 830 bootopt = RB_AUTOBOOT | RB_DUMP; 831 if (sync_on_panic == 0) 832 bootopt |= RB_NOSYNC; 833 newpanic = 0; 834 if (panicstr) { 835 bootopt |= RB_NOSYNC; 836 } else { 837 panicstr = fmt; 838 newpanic = 1; 839 } 840 841 /* 842 * Format the panic string. 843 */ 844 __va_start(ap, fmt); 845 kvsnprintf(buf, sizeof(buf), fmt, ap); 846 if (panicstr == fmt) 847 panicstr = buf; 848 __va_end(ap); 849 if (panic_notifier != NULL) 850 panic_notifier->notifier(panic_notifier->arg); 851 kprintf("panic: %s\n", buf); 852 /* two separate prints in case of an unmapped page and trap */ 853 kprintf("cpuid = %d\n", mycpu->gd_cpuid); 854 855 #if (NGPIO > 0) && defined(ERROR_LED_ON_PANIC) 856 led_switch("error", 1); 857 #endif 858 859 #if defined(WDOG_DISABLE_ON_PANIC) 860 wdog_disable(); 861 #endif 862 863 /* 864 * Make sure kgdb knows who we are, there won't be a stoppcbs[] 865 * entry since our cpu wasn't stopped. 866 */ 867 savectx(&dumppcb); 868 dumpthread = curthread; 869 870 /* 871 * Enter the debugger or fall through & dump. Entering the 872 * debugger will stop cpus. If not entering the debugger stop 873 * cpus here. 874 * 875 * Limit the trace history to leave more panic data on a 876 * potentially row-limited console. 877 */ 878 879 #if defined(DDB) 880 if (newpanic && trace_on_panic) 881 print_backtrace(6); 882 if (debugger_on_panic) 883 Debugger("panic"); 884 else 885 #endif 886 if (newpanic) 887 stop_cpus(mycpu->gd_other_cpus); 888 boot(bootopt); 889 } 890 891 /* 892 * Support for poweroff delay. 893 */ 894 #ifndef POWEROFF_DELAY 895 # define POWEROFF_DELAY 5000 896 #endif 897 static int poweroff_delay = POWEROFF_DELAY; 898 899 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 900 &poweroff_delay, 0, ""); 901 902 static void 903 poweroff_wait(void *junk, int howto) 904 { 905 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 906 return; 907 DELAY(poweroff_delay * 1000); 908 } 909 910 /* 911 * Some system processes (e.g. syncer) need to be stopped at appropriate 912 * points in their main loops prior to a system shutdown, so that they 913 * won't interfere with the shutdown process (e.g. by holding a disk buf 914 * to cause sync to fail). For each of these system processes, register 915 * shutdown_kproc() as a handler for one of shutdown events. 916 */ 917 static int kproc_shutdown_wait = 60; 918 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 919 &kproc_shutdown_wait, 0, ""); 920 921 void 922 shutdown_kproc(void *arg, int howto) 923 { 924 struct thread *td; 925 struct proc *p; 926 int error; 927 928 if (panicstr) 929 return; 930 931 td = (struct thread *)arg; 932 if ((p = td->td_proc) != NULL) { 933 kprintf("Waiting (max %d seconds) for system process `%s' to stop...", 934 kproc_shutdown_wait, p->p_comm); 935 } else { 936 kprintf("Waiting (max %d seconds) for system thread %s to stop...", 937 kproc_shutdown_wait, td->td_comm); 938 } 939 error = suspend_kproc(td, kproc_shutdown_wait * hz); 940 941 if (error == EWOULDBLOCK) 942 kprintf("timed out\n"); 943 else 944 kprintf("stopped\n"); 945 } 946 947 /* Registration of dumpers */ 948 int 949 set_dumper(struct dumperinfo *di) 950 { 951 if (di == NULL) { 952 bzero(&dumper, sizeof(dumper)); 953 return 0; 954 } 955 956 if (dumper.dumper != NULL) 957 return (EBUSY); 958 959 dumper = *di; 960 return 0; 961 } 962 963 void 964 dumpsys(void) 965 { 966 #if defined (_KERNEL_VIRTUAL) 967 /* vkernels don't support dumps */ 968 kprintf("vkernels don't support dumps\n"); 969 return; 970 #endif 971 /* 972 * If there is a dumper registered and we aren't dumping already, call 973 * the machine dependent dumpsys (md_dumpsys) to do the hard work. 974 * 975 * XXX: while right now the md_dumpsys() of x86 and x86_64 could be 976 * factored out completely into here, I rather keep them machine 977 * dependent in case we ever add a platform which does not share 978 * the same dumpsys() code, such as arm. 979 */ 980 if (dumper.dumper != NULL && !dumping) { 981 dumping++; 982 md_dumpsys(&dumper); 983 } 984 } 985 986 __read_frequently int dump_stop_usertds = 0; 987 988 static 989 void 990 need_user_resched_remote(void *dummy) 991 { 992 need_user_resched(); 993 } 994 995 void 996 dump_reactivate_cpus(void) 997 { 998 globaldata_t gd; 999 int cpu, seq; 1000 1001 dump_stop_usertds = 1; 1002 1003 need_user_resched(); 1004 1005 for (cpu = 0; cpu < ncpus; cpu++) { 1006 gd = globaldata_find(cpu); 1007 seq = lwkt_send_ipiq(gd, need_user_resched_remote, NULL); 1008 lwkt_wait_ipiq(gd, seq); 1009 } 1010 1011 restart_cpus(stopped_cpus); 1012 } 1013