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/priv.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/sysproto.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 #include <sys/wdog.h> 87 #include <dev/acpica/acpi_pvpanic/panic_notifier.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 /* 127 * Variable panicstr contains argument to first call to panic; used as flag 128 * to indicate that the kernel has already called panic. 129 */ 130 const char *panicstr; 131 132 int dumping; /* system is dumping */ 133 static struct dumperinfo dumper; /* selected dumper */ 134 135 globaldata_t panic_cpu_gd; /* which cpu took the panic */ 136 struct lwkt_tokref panic_tokens[LWKT_MAXTOKENS]; 137 int panic_tokens_count; 138 139 int bootverbose = 0; /* note: assignment to force non-bss */ 140 SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, 141 &bootverbose, 0, "Verbose kernel messages"); 142 143 int cold = 1; /* note: assignment to force non-bss */ 144 int dumplo; /* OBSOLETE - savecore compat */ 145 u_int64_t dumplo64; 146 147 static void boot (int) __dead2; 148 static int setdumpdev (cdev_t dev); 149 static void poweroff_wait (void *, int); 150 static void print_uptime (void); 151 static void shutdown_halt (void *junk, int howto); 152 static void shutdown_panic (void *junk, int howto); 153 static void shutdown_reset (void *junk, int howto); 154 static int shutdown_busycount1(struct buf *bp, void *info); 155 static int shutdown_busycount2(struct buf *bp, void *info); 156 static void shutdown_cleanup_proc(struct proc *p); 157 158 /* register various local shutdown events */ 159 static void 160 shutdown_conf(void *unused) 161 { 162 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 163 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 164 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 165 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 166 } 167 168 SYSINIT(shutdown_conf, SI_BOOT2_MACHDEP, SI_ORDER_ANY, shutdown_conf, NULL); 169 170 /* ARGSUSED */ 171 172 /* 173 * The system call that results in a reboot 174 * 175 * MPALMOSTSAFE 176 */ 177 int 178 sys_reboot(struct reboot_args *uap) 179 { 180 struct thread *td = curthread; 181 int error; 182 183 if ((error = priv_check(td, PRIV_REBOOT))) 184 return (error); 185 186 get_mplock(); 187 boot(uap->opt); 188 rel_mplock(); 189 return (0); 190 } 191 192 /* 193 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 194 */ 195 static int shutdown_howto = 0; 196 197 void 198 shutdown_nice(int howto) 199 { 200 shutdown_howto = howto; 201 202 /* Send a signal to init(8) and have it shutdown the world */ 203 if (initproc != NULL) { 204 ksignal(initproc, SIGINT); 205 } else { 206 /* No init(8) running, so simply reboot */ 207 boot(RB_NOSYNC); 208 } 209 return; 210 } 211 static int waittime = -1; 212 struct pcb dumppcb; 213 struct thread *dumpthread; 214 215 static void 216 print_uptime(void) 217 { 218 int f; 219 struct timespec ts; 220 221 getnanouptime(&ts); 222 kprintf("Uptime: "); 223 f = 0; 224 if (ts.tv_sec >= 86400) { 225 kprintf("%ldd", ts.tv_sec / 86400); 226 ts.tv_sec %= 86400; 227 f = 1; 228 } 229 if (f || ts.tv_sec >= 3600) { 230 kprintf("%ldh", ts.tv_sec / 3600); 231 ts.tv_sec %= 3600; 232 f = 1; 233 } 234 if (f || ts.tv_sec >= 60) { 235 kprintf("%ldm", ts.tv_sec / 60); 236 ts.tv_sec %= 60; 237 f = 1; 238 } 239 kprintf("%lds\n", ts.tv_sec); 240 } 241 242 /* 243 * Go through the rigmarole of shutting down.. 244 * this used to be in machdep.c but I'll be dammned if I could see 245 * anything machine dependant in it. 246 */ 247 static void 248 boot(int howto) 249 { 250 /* 251 * Get rid of any user scheduler baggage and then give 252 * us a high priority. 253 */ 254 if (curthread->td_release) 255 curthread->td_release(curthread); 256 lwkt_setpri_self(TDPRI_MAX); 257 258 /* collect extra flags that shutdown_nice might have set */ 259 howto |= shutdown_howto; 260 261 /* 262 * We really want to shutdown on the BSP. Subsystems such as ACPI 263 * can't power-down the box otherwise. 264 */ 265 if (!CPUMASK_ISUP(smp_active_mask)) { 266 kprintf("boot() called on cpu#%d\n", mycpu->gd_cpuid); 267 } 268 if (panicstr == NULL && mycpu->gd_cpuid != 0) { 269 kprintf("Switching to cpu #0 for shutdown\n"); 270 lwkt_setcpu_self(globaldata_find(0)); 271 } 272 /* 273 * Do any callouts that should be done BEFORE syncing the filesystems. 274 */ 275 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 276 277 /* 278 * Try to get rid of any remaining FS references. The calling 279 * process, proc0, and init may still hold references. The 280 * VFS cache subsystem may still hold a root reference to root. 281 * 282 * XXX this needs work. We really need to SIGSTOP all remaining 283 * processes in order to avoid blowups due to proc0's filesystem 284 * references going away. For now just make sure that the init 285 * process is stopped. 286 */ 287 if (panicstr == NULL) { 288 shutdown_cleanup_proc(curproc); 289 shutdown_cleanup_proc(&proc0); 290 if (initproc) { 291 if (initproc != curproc) { 292 ksignal(initproc, SIGSTOP); 293 tsleep(boot, 0, "shutdn", hz / 20); 294 } 295 shutdown_cleanup_proc(initproc); 296 } 297 vfs_cache_setroot(NULL, NULL); 298 } 299 300 /* 301 * Now sync filesystems 302 */ 303 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 304 int iter, nbusy, pbusy; 305 int zcount; 306 307 waittime = 0; 308 zcount = 0; 309 kprintf("\nsyncing disks... "); 310 311 sys_sync(NULL); 312 313 /* 314 * With soft updates, some buffers that are written will be 315 * remarked as dirty until other buffers are written. 316 * 317 * sys_sync() usually runs asynchronously, to give us a 318 * better chance of syncing the rest of the filesystems when 319 * one or more of them are stuck. 320 */ 321 for (iter = pbusy = 0; iter < 20 + zcount; iter++) { 322 if (iter <= 10) 323 nbusy = scan_all_buffers(shutdown_busycount1, 324 &iter); 325 else 326 nbusy = scan_all_buffers(shutdown_busycount2, 327 &iter); 328 kprintf("%d ", nbusy); 329 if (nbusy == 0) { 330 if (++zcount == 3) 331 break; 332 } else { 333 zcount = 0; 334 } 335 336 /* 337 * There could be a lot to sync, only allow iter to 338 * proceed while there is progress. 339 */ 340 if (nbusy < pbusy) { 341 if (iter > 10) 342 iter = 10; 343 else 344 iter = 0; 345 } 346 pbusy = nbusy; 347 348 /* 349 * XXX: 350 * Process soft update work queue if buffers don't sync 351 * after 6 iterations by permitting the syncer to run. 352 */ 353 if (iter > 5) 354 bio_ops_sync(NULL); 355 356 sys_sync(NULL); 357 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1); 358 } 359 kprintf("\n"); 360 361 if (zcount < 3) { 362 /* 363 * Failed to sync all blocks. Indicate this and don't 364 * unmount filesystems (thus forcing an fsck on reboot). 365 */ 366 kprintf("giving up on %d buffers\n", nbusy); 367 #ifdef DDB 368 if (debugger_on_panic) 369 Debugger("busy buffer problem"); 370 #endif /* DDB */ 371 tsleep(boot, 0, "shutdn", hz * 5 + 1); 372 } else { 373 kprintf("done\n"); 374 375 /* 376 * Unmount filesystems 377 */ 378 if (panicstr == NULL) 379 vfs_unmountall(); 380 } 381 tsleep(boot, 0, "shutdn", hz / 10 + 1); 382 } 383 384 print_uptime(); 385 386 /* 387 * Dump before doing post_sync shutdown ops 388 */ 389 crit_enter(); 390 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) { 391 dumpsys(); 392 } 393 394 /* 395 * Ok, now do things that assume all filesystem activity has 396 * been completed. This will also call the device shutdown 397 * methods. 398 */ 399 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 400 401 /* Now that we're going to really halt the system... */ 402 EVENTHANDLER_INVOKE(shutdown_final, howto); 403 404 for(;;) ; /* safety against shutdown_reset not working */ 405 /* NOTREACHED */ 406 } 407 408 /* 409 * Pass 1 - Figure out if there are any busy or dirty buffers still present. 410 * 411 * We ignore TMPFS mounts in this pass. 412 */ 413 static int 414 shutdown_busycount1(struct buf *bp, void *info __unused) 415 { 416 struct vnode *vp; 417 418 if ((vp = bp->b_vp) != NULL && vp->v_tag == VT_TMPFS) 419 return (0); 420 if ((bp->b_flags & B_INVAL) == 0 && BUF_LOCKINUSE(bp)) 421 return(1); 422 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) 423 return (1); 424 return (0); 425 } 426 427 /* 428 * Pass 2 - only run after pass 1 has completed or has given up 429 * 430 * We ignore TMPFS, NFS, MFS, and SMBFS mounts in this pass. 431 */ 432 static int 433 shutdown_busycount2(struct buf *bp, void *info) 434 { 435 struct vnode *vp; 436 int *iterp = info; 437 const char *mpath; 438 439 /* 440 * Ignore tmpfs and nfs mounts 441 */ 442 if ((vp = bp->b_vp) != NULL) { 443 if (vp->v_tag == VT_TMPFS) 444 return (0); 445 if (vp->v_tag == VT_NFS) 446 return (0); 447 if (vp->v_tag == VT_MFS) 448 return (0); 449 if (vp->v_tag == VT_SMBFS) 450 return (0); 451 } 452 453 /* 454 * Only count buffers stuck on I/O, ignore everything else 455 */ 456 if (((bp->b_flags & B_INVAL) == 0 && BUF_LOCKINUSE(bp)) || 457 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 458 /* 459 * Only count buffers undergoing write I/O 460 * on the related vnode. 461 */ 462 if (bp->b_vp == NULL || 463 bio_track_active(&bp->b_vp->v_track_write) == 0) { 464 return (0); 465 } 466 if (*iterp > 15) { 467 mpath = "?"; 468 if (bp->b_vp->v_mount) 469 mpath = bp->b_vp->v_mount->mnt_stat.f_mntonname; 470 471 kprintf("%p on %s, flags:%08x, loffset:%jd, " 472 "doffset:%jd\n", 473 bp, 474 mpath, 475 bp->b_flags, 476 (intmax_t)bp->b_loffset, 477 (intmax_t)bp->b_bio2.bio_offset); 478 } 479 return(1); 480 } 481 return(0); 482 } 483 484 /* 485 * If the shutdown was a clean halt, behave accordingly. 486 */ 487 static void 488 shutdown_halt(void *junk, int howto) 489 { 490 if (howto & RB_HALT) { 491 kprintf("\n"); 492 kprintf("The operating system has halted.\n"); 493 #ifdef _KERNEL_VIRTUAL 494 cpu_halt(); 495 #else 496 kprintf("Please press any key to reboot.\n\n"); 497 switch (cngetc()) { 498 case -1: /* No console, just die */ 499 cpu_halt(); 500 /* NOTREACHED */ 501 default: 502 howto &= ~RB_HALT; 503 break; 504 } 505 #endif 506 } 507 } 508 509 /* 510 * Check to see if the system paniced, pause and then reboot 511 * according to the specified delay. 512 */ 513 static void 514 shutdown_panic(void *junk, int howto) 515 { 516 int loop; 517 int c; 518 519 if (howto & RB_DUMP) { 520 if (PANIC_REBOOT_WAIT_TIME != 0) { 521 if (PANIC_REBOOT_WAIT_TIME != -1) { 522 kprintf("Automatic reboot in %d seconds - " 523 "press a key on the console to abort\n", 524 PANIC_REBOOT_WAIT_TIME); 525 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 526 loop > 0; --loop) { 527 DELAY(1000 * 100); /* 1/10th second */ 528 /* Did user type a key? */ 529 c = cncheckc(); 530 if (c != -1 && c != NOKEY) 531 break; 532 } 533 if (!loop) 534 return; 535 } 536 } else { /* zero time specified - reboot NOW */ 537 return; 538 } 539 kprintf("--> Press a key on the console to reboot,\n"); 540 kprintf("--> or switch off the system now.\n"); 541 cngetc(); 542 } 543 } 544 545 /* 546 * Everything done, now reset 547 */ 548 static void 549 shutdown_reset(void *junk, int howto) 550 { 551 kprintf("Rebooting...\n"); 552 DELAY(1000000); /* wait 1 sec for kprintf's to complete and be read */ 553 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 554 cpu_reset(); 555 /* NOTREACHED */ /* assuming reset worked */ 556 } 557 558 /* 559 * Try to remove FS references in the specified process. This function 560 * is used during shutdown 561 */ 562 static 563 void 564 shutdown_cleanup_proc(struct proc *p) 565 { 566 struct filedesc *fdp; 567 struct vmspace *vm; 568 569 if (p == NULL) 570 return; 571 if ((fdp = p->p_fd) != NULL) { 572 kern_closefrom(0); 573 if (fdp->fd_cdir) { 574 cache_drop(&fdp->fd_ncdir); 575 vrele(fdp->fd_cdir); 576 fdp->fd_cdir = NULL; 577 } 578 if (fdp->fd_rdir) { 579 cache_drop(&fdp->fd_nrdir); 580 vrele(fdp->fd_rdir); 581 fdp->fd_rdir = NULL; 582 } 583 if (fdp->fd_jdir) { 584 cache_drop(&fdp->fd_njdir); 585 vrele(fdp->fd_jdir); 586 fdp->fd_jdir = NULL; 587 } 588 } 589 if (p->p_vkernel) 590 vkernel_exit(p); 591 if (p->p_textvp) { 592 vrele(p->p_textvp); 593 p->p_textvp = NULL; 594 } 595 vm = p->p_vmspace; 596 if (vm != NULL) { 597 pmap_remove_pages(vmspace_pmap(vm), 598 VM_MIN_USER_ADDRESS, 599 VM_MAX_USER_ADDRESS); 600 vm_map_remove(&vm->vm_map, 601 VM_MIN_USER_ADDRESS, 602 VM_MAX_USER_ADDRESS); 603 } 604 } 605 606 /* 607 * Magic number for savecore 608 * 609 * exported (symorder) and used at least by savecore(8) 610 * 611 * Mark it as used so that gcc doesn't optimize it away. 612 */ 613 __attribute__((__used__)) 614 static u_long const dumpmag = 0x8fca0101UL; 615 616 __attribute__((__used__)) 617 static int dumpsize = 0; /* also for savecore */ 618 619 static int dodump = 1; 620 621 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 622 "Try to perform coredump on kernel panic"); 623 624 void 625 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 626 uint64_t dumplen, uint32_t blksz) 627 { 628 bzero(kdh, sizeof(*kdh)); 629 strncpy(kdh->magic, magic, sizeof(kdh->magic)); 630 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 631 kdh->version = htod32(KERNELDUMPVERSION); 632 kdh->architectureversion = htod32(archver); 633 kdh->dumplength = htod64(dumplen); 634 kdh->dumptime = htod64(time_second); 635 kdh->blocksize = htod32(blksz); 636 strncpy(kdh->hostname, hostname, sizeof(kdh->hostname)); 637 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 638 if (panicstr != NULL) 639 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 640 kdh->parity = kerneldump_parity(kdh); 641 } 642 643 static int 644 setdumpdev(cdev_t dev) 645 { 646 int error; 647 int doopen; 648 649 if (dev == NULL) { 650 disk_dumpconf(NULL, 0/*off*/); 651 dumpdev = NULL; 652 return (0); 653 } 654 655 /* 656 * We have to open the device before we can perform ioctls on it, 657 * or the slice/label data may not be present. Device opens are 658 * usually tracked by specfs, but the dump device can be set in 659 * early boot and may not be open so this is somewhat of a hack. 660 */ 661 doopen = (dev->si_sysref.refcnt == 1); 662 if (doopen) { 663 error = dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred, NULL); 664 if (error) 665 return (error); 666 } 667 error = disk_dumpconf(dev, 1/*on*/); 668 if (error == 0) 669 dumpdev = dev; 670 671 return error; 672 } 673 674 /* ARGSUSED */ 675 static void dump_conf (void *dummy); 676 static void 677 dump_conf(void *dummy) 678 { 679 char *path; 680 cdev_t dev; 681 int _dummy; 682 683 path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK); 684 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { 685 /* 686 * Make sure all disk devices created so far have also been 687 * probed, and also make sure that the newly created device 688 * nodes for probed disks are ready, too. 689 * 690 * XXX - Delay an additional 2 seconds to help drivers which 691 * pickup devices asynchronously and are not caught by 692 * CAM's initial probe. 693 */ 694 sync_devs(); 695 tsleep(&_dummy, 0, "syncer", hz*2); 696 697 dev = kgetdiskbyname(path); 698 if (dev != NULL) 699 dumpdev = dev; 700 } 701 kfree(path, M_TEMP); 702 if (setdumpdev(dumpdev) != 0) 703 dumpdev = NULL; 704 } 705 706 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL); 707 708 static int 709 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 710 { 711 int error; 712 udev_t ndumpdev; 713 714 ndumpdev = dev2udev(dumpdev); 715 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 716 if (error == 0 && req->newptr != NULL) 717 error = setdumpdev(udev2dev(ndumpdev, 0)); 718 return (error); 719 } 720 721 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 722 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,udev_t", ""); 723 724 static struct panicerinfo *panic_notifier; 725 726 int 727 set_panic_notifier(struct panicerinfo *info) 728 { 729 if (info == NULL) 730 panic_notifier = NULL; 731 else if (panic_notifier != NULL) 732 return 1; 733 else 734 panic_notifier = info; 735 736 return 0; 737 } 738 739 /* 740 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 741 * and then reboots. If we are called twice, then we avoid trying to sync 742 * the disks as this often leads to recursive panics. 743 */ 744 void 745 panic(const char *fmt, ...) 746 { 747 int bootopt, newpanic; 748 globaldata_t gd = mycpu; 749 thread_t td = gd->gd_curthread; 750 __va_list ap; 751 static char buf[256]; 752 753 /* 754 * If a panic occurs on multiple cpus before the first is able to 755 * halt the other cpus, only one cpu is allowed to take the panic. 756 * Attempt to be verbose about this situation but if the kprintf() 757 * itself panics don't let us overrun the kernel stack. 758 * 759 * Be very nasty about descheduling our thread at the lowest 760 * level possible in an attempt to freeze the thread without 761 * inducing further panics. 762 * 763 * Bumping gd_trap_nesting_level will also bypass assertions in 764 * lwkt_switch() and allow us to switch away even if we are a 765 * FAST interrupt or IPI. 766 * 767 * The setting of panic_cpu_gd also determines how kprintf() 768 * spin-locks itself. DDB can set panic_cpu_gd as well. 769 */ 770 for (;;) { 771 globaldata_t xgd = panic_cpu_gd; 772 773 /* 774 * Someone else got the panic cpu 775 */ 776 if (xgd && xgd != gd) { 777 crit_enter(); 778 ++mycpu->gd_trap_nesting_level; 779 if (mycpu->gd_trap_nesting_level < 25) { 780 kprintf("SECONDARY PANIC ON CPU %d THREAD %p\n", 781 mycpu->gd_cpuid, td); 782 } 783 td->td_release = NULL; /* be a grinch */ 784 for (;;) { 785 lwkt_deschedule_self(td); 786 lwkt_switch(); 787 } 788 /* NOT REACHED */ 789 /* --mycpu->gd_trap_nesting_level */ 790 /* crit_exit() */ 791 } 792 793 /* 794 * Reentrant panic 795 */ 796 if (xgd && xgd == gd) 797 break; 798 799 /* 800 * We got it 801 */ 802 if (atomic_cmpset_ptr(&panic_cpu_gd, NULL, gd)) 803 break; 804 } 805 /* 806 * Try to get the system into a working state. Save information 807 * we are about to destroy. 808 */ 809 kvcreinitspin(); 810 if (panicstr == NULL) { 811 bcopy(td->td_toks_array, panic_tokens, sizeof(panic_tokens)); 812 panic_tokens_count = td->td_toks_stop - &td->td_toks_base; 813 } 814 lwkt_relalltokens(td); 815 td->td_toks_stop = &td->td_toks_base; 816 if (gd->gd_spinlocks) 817 kprintf("panic with %d spinlocks held\n", gd->gd_spinlocks); 818 gd->gd_spinlocks = 0; 819 820 /* 821 * Setup 822 */ 823 bootopt = RB_AUTOBOOT | RB_DUMP; 824 if (sync_on_panic == 0) 825 bootopt |= RB_NOSYNC; 826 newpanic = 0; 827 if (panicstr) { 828 bootopt |= RB_NOSYNC; 829 } else { 830 panicstr = fmt; 831 newpanic = 1; 832 } 833 834 /* 835 * Format the panic string. 836 */ 837 __va_start(ap, fmt); 838 kvsnprintf(buf, sizeof(buf), fmt, ap); 839 if (panicstr == fmt) 840 panicstr = buf; 841 __va_end(ap); 842 if (panic_notifier != NULL) 843 panic_notifier->notifier(panic_notifier->arg); 844 kprintf("panic: %s\n", buf); 845 /* two separate prints in case of an unmapped page and trap */ 846 kprintf("cpuid = %d\n", mycpu->gd_cpuid); 847 848 #if (NGPIO > 0) && defined(ERROR_LED_ON_PANIC) 849 led_switch("error", 1); 850 #endif 851 852 #if defined(WDOG_DISABLE_ON_PANIC) 853 wdog_disable(); 854 #endif 855 856 /* 857 * Make sure kgdb knows who we are, there won't be a stoppcbs[] 858 * entry since our cpu wasn't stopped. 859 */ 860 savectx(&dumppcb); 861 dumpthread = curthread; 862 863 /* 864 * Enter the debugger or fall through & dump. Entering the 865 * debugger will stop cpus. If not entering the debugger stop 866 * cpus here. 867 * 868 * Limit the trace history to leave more panic data on a 869 * potentially row-limited console. 870 */ 871 872 #if defined(DDB) 873 if (newpanic && trace_on_panic) 874 print_backtrace(6); 875 if (debugger_on_panic) 876 Debugger("panic"); 877 else 878 #endif 879 if (newpanic) 880 stop_cpus(mycpu->gd_other_cpus); 881 boot(bootopt); 882 } 883 884 /* 885 * Support for poweroff delay. 886 */ 887 #ifndef POWEROFF_DELAY 888 # define POWEROFF_DELAY 5000 889 #endif 890 static int poweroff_delay = POWEROFF_DELAY; 891 892 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 893 &poweroff_delay, 0, ""); 894 895 static void 896 poweroff_wait(void *junk, int howto) 897 { 898 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 899 return; 900 DELAY(poweroff_delay * 1000); 901 } 902 903 /* 904 * Some system processes (e.g. syncer) need to be stopped at appropriate 905 * points in their main loops prior to a system shutdown, so that they 906 * won't interfere with the shutdown process (e.g. by holding a disk buf 907 * to cause sync to fail). For each of these system processes, register 908 * shutdown_kproc() as a handler for one of shutdown events. 909 */ 910 static int kproc_shutdown_wait = 60; 911 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 912 &kproc_shutdown_wait, 0, ""); 913 914 void 915 shutdown_kproc(void *arg, int howto) 916 { 917 struct thread *td; 918 struct proc *p; 919 int error; 920 921 if (panicstr) 922 return; 923 924 td = (struct thread *)arg; 925 if ((p = td->td_proc) != NULL) { 926 kprintf("Waiting (max %d seconds) for system process `%s' to stop...", 927 kproc_shutdown_wait, p->p_comm); 928 } else { 929 kprintf("Waiting (max %d seconds) for system thread %s to stop...", 930 kproc_shutdown_wait, td->td_comm); 931 } 932 error = suspend_kproc(td, kproc_shutdown_wait * hz); 933 934 if (error == EWOULDBLOCK) 935 kprintf("timed out\n"); 936 else 937 kprintf("stopped\n"); 938 } 939 940 /* Registration of dumpers */ 941 int 942 set_dumper(struct dumperinfo *di) 943 { 944 if (di == NULL) { 945 bzero(&dumper, sizeof(dumper)); 946 return 0; 947 } 948 949 if (dumper.dumper != NULL) 950 return (EBUSY); 951 952 dumper = *di; 953 return 0; 954 } 955 956 void 957 dumpsys(void) 958 { 959 #if defined (_KERNEL_VIRTUAL) 960 /* vkernels don't support dumps */ 961 kprintf("vkernels don't support dumps\n"); 962 return; 963 #endif 964 /* 965 * If there is a dumper registered and we aren't dumping already, call 966 * the machine dependent dumpsys (md_dumpsys) to do the hard work. 967 * 968 * XXX: while right now the md_dumpsys() of x86 and x86_64 could be 969 * factored out completely into here, I rather keep them machine 970 * dependent in case we ever add a platform which does not share 971 * the same dumpsys() code, such as arm. 972 */ 973 if (dumper.dumper != NULL && !dumping) { 974 dumping++; 975 md_dumpsys(&dumper); 976 } 977 } 978 979 int dump_stop_usertds = 0; 980 981 static 982 void 983 need_user_resched_remote(void *dummy) 984 { 985 need_user_resched(); 986 } 987 988 void 989 dump_reactivate_cpus(void) 990 { 991 globaldata_t gd; 992 int cpu, seq; 993 994 dump_stop_usertds = 1; 995 996 need_user_resched(); 997 998 for (cpu = 0; cpu < ncpus; cpu++) { 999 gd = globaldata_find(cpu); 1000 seq = lwkt_send_ipiq(gd, need_user_resched_remote, NULL); 1001 lwkt_wait_ipiq(gd, seq); 1002 } 1003 1004 restart_cpus(stopped_cpus); 1005 } 1006