Create 'k' versions of the kernel malloc API.
[dragonfly.git] / sys / kern / kern_shutdown.c
CommitLineData
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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 $
84204577 40 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.33 2006/09/03 18:29:16 dillon Exp $
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41 */
42
43#include "opt_ddb.h"
b1e04573 44#include "opt_ddb_trace.h"
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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/disklabel.h>
54#include <sys/reboot.h>
55#include <sys/proc.h>
56#include <sys/vnode.h>
57#include <sys/kernel.h>
58#include <sys/kthread.h>
59#include <sys/malloc.h>
60#include <sys/mount.h>
61#include <sys/queue.h>
62#include <sys/sysctl.h>
63#include <sys/conf.h>
64#include <sys/sysproto.h>
335dda38 65#include <sys/device.h>
984263bc 66#include <sys/cons.h>
9ec81f83 67#include <sys/thread2.h>
3020e3be 68#include <sys/buf2.h>
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69
70#include <machine/pcb.h>
71#include <machine/clock.h>
72#include <machine/md_var.h>
0f7a3396 73#include <machine/smp.h> /* smp_active_mask, cpuid */
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74
75#include <sys/signalvar.h>
76
77#ifndef PANIC_REBOOT_WAIT_TIME
78#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
79#endif
80
81/*
82 * Note that stdarg.h and the ANSI style va_start macro is used for both
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83 * ANSI and traditional C compilers. We use the machine version to stay
84 * within the confines of the kernel header files.
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85 */
86#include <machine/stdarg.h>
87
88#ifdef DDB
89#ifdef DDB_UNATTENDED
90int debugger_on_panic = 0;
91#else
92int debugger_on_panic = 1;
93#endif
94SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
95 &debugger_on_panic, 0, "Run debugger on kernel panic");
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96
97extern void db_print_backtrace(void);
98
99#ifdef DDB_TRACE
100int trace_on_panic = 1;
101#else
102int trace_on_panic = 0;
103#endif
104SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
105 &trace_on_panic, 0, "Print stack trace on kernel panic");
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106#endif
107
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108static int sync_on_panic = 1;
109SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
110 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
111
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112SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
113
114#ifdef HW_WDOG
115/*
116 * If there is a hardware watchdog, point this at the function needed to
117 * hold it off.
118 * It's needed when the kernel needs to do some lengthy operations.
119 * e.g. in wd.c when dumping core.. It's most annoying to have
120 * your precious core-dump only half written because the wdog kicked in.
121 */
122watchdog_tickle_fn wdog_tickler = NULL;
123#endif /* HW_WDOG */
124
125/*
126 * Variable panicstr contains argument to first call to panic; used as flag
127 * to indicate that the kernel has already called panic.
128 */
129const char *panicstr;
130
131int dumping; /* system is dumping */
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132#ifdef SMP
133u_int panic_cpu_interlock; /* panic interlock */
134globaldata_t panic_cpu_gd; /* which cpu took the panic */
135#endif
984263bc 136
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137static void boot (int) __dead2;
138static void dumpsys (void);
139static int setdumpdev (dev_t dev);
140static void poweroff_wait (void *, int);
141static void print_uptime (void);
142static void shutdown_halt (void *junk, int howto);
143static void shutdown_panic (void *junk, int howto);
144static void shutdown_reset (void *junk, int howto);
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145static int shutdown_busycount1(struct buf *bp, void *info);
146static int shutdown_busycount2(struct buf *bp, void *info);
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147
148/* register various local shutdown events */
149static void
150shutdown_conf(void *unused)
151{
152 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
153 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
154 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
155 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
156}
157
158SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
159
160/* ARGSUSED */
161
162/*
163 * The system call that results in a reboot
164 */
165int
753fd850 166sys_reboot(struct reboot_args *uap)
984263bc 167{
dadab5e9 168 struct thread *td = curthread;
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169 int error;
170
dadab5e9 171 if ((error = suser(td)))
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172 return (error);
173
174 boot(uap->opt);
175 return (0);
176}
177
178/*
179 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
180 */
181static int shutdown_howto = 0;
182
183void
184shutdown_nice(int howto)
185{
186 shutdown_howto = howto;
187
188 /* Send a signal to init(8) and have it shutdown the world */
189 if (initproc != NULL) {
84204577 190 ksignal(initproc, SIGINT);
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191 } else {
192 /* No init(8) running, so simply reboot */
193 boot(RB_NOSYNC);
194 }
195 return;
196}
197static int waittime = -1;
8b6a428f 198static struct thread *dumpthread;
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199static struct pcb dumppcb;
200
201static void
202print_uptime()
203{
204 int f;
205 struct timespec ts;
206
207 getnanouptime(&ts);
208 printf("Uptime: ");
209 f = 0;
210 if (ts.tv_sec >= 86400) {
211 printf("%ldd", ts.tv_sec / 86400);
212 ts.tv_sec %= 86400;
213 f = 1;
214 }
215 if (f || ts.tv_sec >= 3600) {
216 printf("%ldh", ts.tv_sec / 3600);
217 ts.tv_sec %= 3600;
218 f = 1;
219 }
220 if (f || ts.tv_sec >= 60) {
221 printf("%ldm", ts.tv_sec / 60);
222 ts.tv_sec %= 60;
223 f = 1;
224 }
225 printf("%lds\n", ts.tv_sec);
226}
227
228/*
229 * Go through the rigmarole of shutting down..
230 * this used to be in machdep.c but I'll be dammned if I could see
231 * anything machine dependant in it.
232 */
233static void
41c20dac 234boot(int howto)
984263bc 235{
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236 /*
237 * Get rid of any user scheduler baggage and then give
238 * us a high priority.
239 */
240 if (curthread->td_release)
241 curthread->td_release(curthread);
242 lwkt_setpri_self(TDPRI_MAX);
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243
244 /* collect extra flags that shutdown_nice might have set */
245 howto |= shutdown_howto;
246
247#ifdef SMP
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248 /*
249 * We really want to shutdown on the BSP. Subsystems such as ACPI
250 * can't power-down the box otherwise.
251 */
0f7a3396 252 if (smp_active_mask > 1) {
72740893 253 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
984263bc 254 }
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255 if (panicstr == NULL && mycpu->gd_cpuid != 0) {
256 printf("Switching to cpu #0 for shutdown\n");
257 lwkt_setcpu_self(globaldata_find(0));
258 }
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259#endif
260 /*
261 * Do any callouts that should be done BEFORE syncing the filesystems.
262 */
263 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
264
265 /*
266 * Now sync filesystems
267 */
268 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
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269 int iter, nbusy, pbusy;
270
271 waittime = 0;
272 printf("\nsyncing disks... ");
273
753fd850 274 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
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275
276 /*
277 * With soft updates, some buffers that are
278 * written will be remarked as dirty until other
279 * buffers are written.
280 */
281 for (iter = pbusy = 0; iter < 20; iter++) {
41cbf46c 282 nbusy = scan_all_buffers(shutdown_busycount1, NULL);
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283 if (nbusy == 0)
284 break;
285 printf("%d ", nbusy);
286 if (nbusy < pbusy)
287 iter = 0;
288 pbusy = nbusy;
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289 /*
290 * XXX:
291 * Process soft update work queue if buffers don't sync
292 * after 6 iterations by permitting the syncer to run.
293 */
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294 if (iter > 5 && bioops.io_sync)
295 (*bioops.io_sync)(NULL);
753fd850 296 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
3ad8cc28 297 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1);
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298 }
299 printf("\n");
300 /*
301 * Count only busy local buffers to prevent forcing
302 * a fsck if we're just a client of a wedged NFS server
303 */
41cbf46c 304 nbusy = scan_all_buffers(shutdown_busycount2, NULL);
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305 if (nbusy) {
306 /*
307 * Failed to sync all blocks. Indicate this and don't
308 * unmount filesystems (thus forcing an fsck on reboot).
309 */
310 printf("giving up on %d buffers\n", nbusy);
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311#ifdef DDB
312 Debugger("busy buffer problem");
313#endif /* DDB */
3ad8cc28 314 tsleep(boot, 0, "shutdn", hz * 5 + 1);
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315 } else {
316 printf("done\n");
317 /*
318 * Unmount filesystems
319 */
320 if (panicstr == 0)
321 vfs_unmountall();
322 }
3ad8cc28 323 tsleep(boot, 0, "shutdn", hz / 10 + 1);
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324 }
325
326 print_uptime();
327
328 /*
329 * Ok, now do things that assume all filesystem activity has
330 * been completed.
331 */
332 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
9ec81f83 333 crit_enter();
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334 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold)
335 dumpsys();
336
337 /* Now that we're going to really halt the system... */
338 EVENTHANDLER_INVOKE(shutdown_final, howto);
339
340 for(;;) ; /* safety against shutdown_reset not working */
341 /* NOTREACHED */
342}
343
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344static int
345shutdown_busycount1(struct buf *bp, void *info)
346{
347 if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0)
348 return(1);
349 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)
350 return (1);
351 return (0);
352}
353
354static int
355shutdown_busycount2(struct buf *bp, void *info)
356{
357 if (((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp)) ||
358 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
359 /*
360 * Only count buffers undergoing write I/O
361 * on the related vnode.
362 */
363 if (bp->b_vp == NULL ||
364 bp->b_vp->v_track_write.bk_active == 0) {
365 return (0);
366 }
367#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
368 printf(
ce54c037 369 "%p dev:?, flags:%08x, loffset:%lld, doffset:%lld\n",
2dc6c129 370 bp,
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371 bp->b_flags, bp->b_loffset,
372 bp->b_bio2.bio_offset);
373#endif
374 return(1);
375 }
376 return(0);
377}
378
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379/*
380 * If the shutdown was a clean halt, behave accordingly.
381 */
382static void
383shutdown_halt(void *junk, int howto)
384{
385 if (howto & RB_HALT) {
386 printf("\n");
387 printf("The operating system has halted.\n");
388 printf("Please press any key to reboot.\n\n");
389 switch (cngetc()) {
390 case -1: /* No console, just die */
391 cpu_halt();
392 /* NOTREACHED */
393 default:
394 howto &= ~RB_HALT;
395 break;
396 }
397 }
398}
399
400/*
401 * Check to see if the system paniced, pause and then reboot
402 * according to the specified delay.
403 */
404static void
405shutdown_panic(void *junk, int howto)
406{
407 int loop;
408
409 if (howto & RB_DUMP) {
410 if (PANIC_REBOOT_WAIT_TIME != 0) {
411 if (PANIC_REBOOT_WAIT_TIME != -1) {
412 printf("Automatic reboot in %d seconds - "
413 "press a key on the console to abort\n",
414 PANIC_REBOOT_WAIT_TIME);
415 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
416 loop > 0; --loop) {
417 DELAY(1000 * 100); /* 1/10th second */
418 /* Did user type a key? */
419 if (cncheckc() != -1)
420 break;
421 }
422 if (!loop)
423 return;
424 }
425 } else { /* zero time specified - reboot NOW */
426 return;
427 }
428 printf("--> Press a key on the console to reboot,\n");
429 printf("--> or switch off the system now.\n");
430 cngetc();
431 }
432}
433
434/*
435 * Everything done, now reset
436 */
437static void
438shutdown_reset(void *junk, int howto)
439{
440 printf("Rebooting...\n");
441 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
442 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
443 cpu_reset();
444 /* NOTREACHED */ /* assuming reset worked */
445}
446
447/*
448 * Magic number for savecore
449 *
450 * exported (symorder) and used at least by savecore(8)
451 *
452 */
453static u_long const dumpmag = 0x8fca0101UL;
454
455static int dumpsize = 0; /* also for savecore */
456
457static int dodump = 1;
458
459SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
460 "Try to perform coredump on kernel panic");
461
462static int
463setdumpdev(dev)
464 dev_t dev;
465{
466 int psize;
467 long newdumplo;
468
469 if (dev == NODEV) {
470 dumpdev = dev;
471 return (0);
472 }
335dda38 473 psize = dev_dpsize(dev);
984263bc 474 if (psize == -1)
335dda38 475 return (ENXIO);
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476 /*
477 * XXX should clean up checking in dumpsys() to be more like this.
478 */
479 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE);
480 if (newdumplo <= LABELSECTOR)
481 return (ENOSPC);
482 dumpdev = dev;
483 dumplo = newdumplo;
484 return (0);
485}
486
487
488/* ARGSUSED */
402ed7e1 489static void dump_conf (void *dummy);
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490static void
491dump_conf(dummy)
492 void *dummy;
493{
494 char *path;
495 dev_t dev;
496
497 path = malloc(MNAMELEN, M_TEMP, M_WAITOK);
498 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
bc01a404 499 dev = kgetdiskbyname(path);
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500 if (dev != NODEV)
501 dumpdev = dev;
502 }
503 free(path, M_TEMP);
504 if (setdumpdev(dumpdev) != 0)
505 dumpdev = NODEV;
506}
507
508SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
509
510static int
511sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
512{
513 int error;
514 udev_t ndumpdev;
515
516 ndumpdev = dev2udev(dumpdev);
517 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
518 if (error == 0 && req->newptr != NULL)
519 error = setdumpdev(udev2dev(ndumpdev, 0));
520 return (error);
521}
522
523SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
524 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
525
526/*
527 * Doadump comes here after turning off memory management and
528 * getting on the dump stack, either when called above, or by
529 * the auto-restart code.
530 */
531static void
532dumpsys(void)
533{
534 int error;
535
536 savectx(&dumppcb);
8b6a428f 537 dumpthread = curthread;
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538 if (dumping++) {
539 printf("Dump already in progress, bailing...\n");
540 return;
541 }
542 if (!dodump)
543 return;
544 if (dumpdev == NODEV)
545 return;
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546 dumpsize = Maxmem;
547 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo);
548 printf("dump ");
335dda38 549 error = dev_ddump(dumpdev);
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550 if (error == 0) {
551 printf("succeeded\n");
552 return;
553 }
554 printf("failed, reason: ");
555 switch (error) {
335dda38 556 case ENOSYS:
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557 case ENODEV:
558 printf("device doesn't support a dump routine\n");
559 break;
560
561 case ENXIO:
562 printf("device bad\n");
563 break;
564
565 case EFAULT:
566 printf("device not ready\n");
567 break;
568
569 case EINVAL:
570 printf("area improper\n");
571 break;
572
573 case EIO:
574 printf("i/o error\n");
575 break;
576
577 case EINTR:
578 printf("aborted from console\n");
579 break;
580
581 default:
582 printf("unknown, error = %d\n", error);
583 break;
584 }
585}
586
587int
588dumpstatus(vm_offset_t addr, off_t count)
589{
590 int c;
591
592 if (addr % (1024 * 1024) == 0) {
593#ifdef HW_WDOG
594 if (wdog_tickler)
595 (*wdog_tickler)();
596#endif
597 printf("%ld ", (long)(count / (1024 * 1024)));
598 }
599
600 if ((c = cncheckc()) == 0x03)
601 return -1;
602 else if (c != -1)
603 printf("[CTRL-C to abort] ");
604
605 return 0;
606}
607
608/*
609 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
610 * and then reboots. If we are called twice, then we avoid trying to sync
611 * the disks as this often leads to recursive panics.
612 */
613void
614panic(const char *fmt, ...)
615{
b1e04573 616 int bootopt, newpanic;
e2565a42 617 __va_list ap;
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618 static char buf[256];
619
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620#ifdef SMP
621 /*
622 * If a panic occurs on multiple cpus before the first is able to
623 * halt the other cpus, only one cpu is allowed to take the panic.
624 * Attempt to be verbose about this situation but if the printf()
625 * itself panics don't let us overrun the kernel stack.
626 *
627 * Be very nasty about descheduling our thread at the lowest
628 * level possible in an attempt to freeze the thread without
629 * inducing further panics.
630 *
631 * Bumping gd_trap_nesting_level will also bypass assertions in
632 * lwkt_switch() and allow us to switch away even if we are a
633 * FAST interrupt or IPI.
634 */
635 if (atomic_poll_acquire_int(&panic_cpu_interlock)) {
636 panic_cpu_gd = mycpu;
637 } else if (panic_cpu_gd != mycpu) {
638 crit_enter();
639 ++mycpu->gd_trap_nesting_level;
640 if (mycpu->gd_trap_nesting_level < 25) {
641 printf("SECONDARY PANIC ON CPU %d THREAD %p\n",
642 mycpu->gd_cpuid, curthread);
643 }
644 curthread->td_release = NULL; /* be a grinch */
645 for (;;) {
646 lwkt_deschedule_self(curthread);
647 lwkt_switch();
648 }
649 /* NOT REACHED */
650 /* --mycpu->gd_trap_nesting_level */
651 /* crit_exit() */
652 }
653#endif
984263bc 654 bootopt = RB_AUTOBOOT | RB_DUMP;
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655 if (sync_on_panic == 0)
656 bootopt |= RB_NOSYNC;
b1e04573 657 newpanic = 0;
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658 if (panicstr)
659 bootopt |= RB_NOSYNC;
b1e04573 660 else {
984263bc 661 panicstr = fmt;
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662 newpanic = 1;
663 }
984263bc 664
e2565a42 665 __va_start(ap, fmt);
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666 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
667 if (panicstr == fmt)
668 panicstr = buf;
e2565a42 669 __va_end(ap);
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670 printf("panic: %s\n", buf);
671#ifdef SMP
7a44d1cb 672 /* three separate prints in case of an unmapped page and trap */
984263bc 673 printf("mp_lock = %08x; ", mp_lock);
72740893 674 printf("cpuid = %d; ", mycpu->gd_cpuid);
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675 printf("lapic.id = %08x\n", lapic.id);
676#endif
677
678#if defined(DDB)
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679 if (newpanic && trace_on_panic)
680 db_print_backtrace();
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681 if (debugger_on_panic)
682 Debugger ("panic");
683#endif
684 boot(bootopt);
685}
686
687/*
688 * Support for poweroff delay.
689 */
690#ifndef POWEROFF_DELAY
691# define POWEROFF_DELAY 5000
692#endif
693static int poweroff_delay = POWEROFF_DELAY;
694
695SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
696 &poweroff_delay, 0, "");
697
698static void
699poweroff_wait(void *junk, int howto)
700{
701 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
702 return;
703 DELAY(poweroff_delay * 1000);
704}
705
706/*
707 * Some system processes (e.g. syncer) need to be stopped at appropriate
708 * points in their main loops prior to a system shutdown, so that they
709 * won't interfere with the shutdown process (e.g. by holding a disk buf
710 * to cause sync to fail). For each of these system processes, register
711 * shutdown_kproc() as a handler for one of shutdown events.
712 */
713static int kproc_shutdown_wait = 60;
714SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
715 &kproc_shutdown_wait, 0, "");
716
717void
718shutdown_kproc(void *arg, int howto)
719{
bc6dffab 720 struct thread *td;
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721 struct proc *p;
722 int error;
723
724 if (panicstr)
725 return;
726
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727 td = (struct thread *)arg;
728 if ((p = td->td_proc) != NULL) {
729 printf("Waiting (max %d seconds) for system process `%s' to stop...",
730 kproc_shutdown_wait, p->p_comm);
731 } else {
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732 printf("Waiting (max %d seconds) for system thread %s to stop...",
733 kproc_shutdown_wait, td->td_comm);
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734 }
735 error = suspend_kproc(td, kproc_shutdown_wait * hz);
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736
737 if (error == EWOULDBLOCK)
738 printf("timed out\n");
739 else
740 printf("stopped\n");
741}