Add a few more build options.
[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 $
402ed7e1 40 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.11 2003/08/26 21:09:02 rob Exp $
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41 */
42
43#include "opt_ddb.h"
44#include "opt_hw_wdog.h"
45#include "opt_panic.h"
46#include "opt_show_busybufs.h"
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/eventhandler.h>
51#include <sys/buf.h>
52#include <sys/disklabel.h>
53#include <sys/reboot.h>
54#include <sys/proc.h>
55#include <sys/vnode.h>
56#include <sys/kernel.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/conf.h>
63#include <sys/sysproto.h>
335dda38 64#include <sys/device.h>
984263bc 65#include <sys/cons.h>
3020e3be 66#include <sys/buf2.h>
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67
68#include <machine/pcb.h>
69#include <machine/clock.h>
70#include <machine/md_var.h>
71#include <machine/smp.h> /* smp_active, cpuid */
72
73#include <sys/signalvar.h>
74
75#ifndef PANIC_REBOOT_WAIT_TIME
76#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
77#endif
78
79/*
80 * Note that stdarg.h and the ANSI style va_start macro is used for both
81 * ANSI and traditional C compilers.
82 */
83#include <machine/stdarg.h>
84
85#ifdef DDB
86#ifdef DDB_UNATTENDED
87int debugger_on_panic = 0;
88#else
89int debugger_on_panic = 1;
90#endif
91SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
92 &debugger_on_panic, 0, "Run debugger on kernel panic");
93#endif
94
95SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
96
97#ifdef HW_WDOG
98/*
99 * If there is a hardware watchdog, point this at the function needed to
100 * hold it off.
101 * It's needed when the kernel needs to do some lengthy operations.
102 * e.g. in wd.c when dumping core.. It's most annoying to have
103 * your precious core-dump only half written because the wdog kicked in.
104 */
105watchdog_tickle_fn wdog_tickler = NULL;
106#endif /* HW_WDOG */
107
108/*
109 * Variable panicstr contains argument to first call to panic; used as flag
110 * to indicate that the kernel has already called panic.
111 */
112const char *panicstr;
113
114int dumping; /* system is dumping */
115
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116static void boot (int) __dead2;
117static void dumpsys (void);
118static int setdumpdev (dev_t dev);
119static void poweroff_wait (void *, int);
120static void print_uptime (void);
121static void shutdown_halt (void *junk, int howto);
122static void shutdown_panic (void *junk, int howto);
123static void shutdown_reset (void *junk, int howto);
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124
125/* register various local shutdown events */
126static void
127shutdown_conf(void *unused)
128{
129 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
130 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
131 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
132 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
133}
134
135SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
136
137/* ARGSUSED */
138
139/*
140 * The system call that results in a reboot
141 */
142int
41c20dac 143reboot(struct reboot_args *uap)
984263bc 144{
dadab5e9 145 struct thread *td = curthread;
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146 int error;
147
dadab5e9 148 if ((error = suser(td)))
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149 return (error);
150
151 boot(uap->opt);
152 return (0);
153}
154
155/*
156 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
157 */
158static int shutdown_howto = 0;
159
160void
161shutdown_nice(int howto)
162{
163 shutdown_howto = howto;
164
165 /* Send a signal to init(8) and have it shutdown the world */
166 if (initproc != NULL) {
167 psignal(initproc, SIGINT);
168 } else {
169 /* No init(8) running, so simply reboot */
170 boot(RB_NOSYNC);
171 }
172 return;
173}
174static int waittime = -1;
175static struct pcb dumppcb;
176
177static void
178print_uptime()
179{
180 int f;
181 struct timespec ts;
182
183 getnanouptime(&ts);
184 printf("Uptime: ");
185 f = 0;
186 if (ts.tv_sec >= 86400) {
187 printf("%ldd", ts.tv_sec / 86400);
188 ts.tv_sec %= 86400;
189 f = 1;
190 }
191 if (f || ts.tv_sec >= 3600) {
192 printf("%ldh", ts.tv_sec / 3600);
193 ts.tv_sec %= 3600;
194 f = 1;
195 }
196 if (f || ts.tv_sec >= 60) {
197 printf("%ldm", ts.tv_sec / 60);
198 ts.tv_sec %= 60;
199 f = 1;
200 }
201 printf("%lds\n", ts.tv_sec);
202}
203
204/*
205 * Go through the rigmarole of shutting down..
206 * this used to be in machdep.c but I'll be dammned if I could see
207 * anything machine dependant in it.
208 */
209static void
41c20dac 210boot(int howto)
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211{
212
213 /* collect extra flags that shutdown_nice might have set */
214 howto |= shutdown_howto;
215
216#ifdef SMP
217 if (smp_active) {
72740893 218 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
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219 }
220#endif
221 /*
222 * Do any callouts that should be done BEFORE syncing the filesystems.
223 */
224 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
225
226 /*
227 * Now sync filesystems
228 */
229 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
1fd87d54 230 struct buf *bp;
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231 int iter, nbusy, pbusy;
232
233 waittime = 0;
234 printf("\nsyncing disks... ");
235
41c20dac 236 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
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237
238 /*
239 * With soft updates, some buffers that are
240 * written will be remarked as dirty until other
241 * buffers are written.
242 */
243 for (iter = pbusy = 0; iter < 20; iter++) {
244 nbusy = 0;
245 for (bp = &buf[nbuf]; --bp >= buf; ) {
246 if ((bp->b_flags & B_INVAL) == 0 &&
247 BUF_REFCNT(bp) > 0) {
248 nbusy++;
249 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
250 == B_DELWRI) {
251 /* bawrite(bp);*/
252 nbusy++;
253 }
254 }
255 if (nbusy == 0)
256 break;
257 printf("%d ", nbusy);
258 if (nbusy < pbusy)
259 iter = 0;
260 pbusy = nbusy;
261 if (iter > 5 && bioops.io_sync)
262 (*bioops.io_sync)(NULL);
41c20dac 263 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
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264 DELAY(50000 * iter);
265 }
266 printf("\n");
267 /*
268 * Count only busy local buffers to prevent forcing
269 * a fsck if we're just a client of a wedged NFS server
270 */
271 nbusy = 0;
272 for (bp = &buf[nbuf]; --bp >= buf; ) {
273 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
274 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
275 if (bp->b_dev == NODEV) {
276 TAILQ_REMOVE(&mountlist,
277 bp->b_vp->v_mount, mnt_list);
278 continue;
279 }
280 nbusy++;
281#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
282 printf(
283 "%p %d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n",
284 bp, nbusy, devtoname(bp->b_dev),
285 bp->b_flags, (long)bp->b_blkno,
286 (long)bp->b_lblkno);
287#endif
288 }
289 }
290 if (nbusy) {
291 /*
292 * Failed to sync all blocks. Indicate this and don't
293 * unmount filesystems (thus forcing an fsck on reboot).
294 */
295 printf("giving up on %d buffers\n", nbusy);
296 DELAY(5000000); /* 5 seconds */
297 } else {
298 printf("done\n");
299 /*
300 * Unmount filesystems
301 */
302 if (panicstr == 0)
303 vfs_unmountall();
304 }
305 DELAY(100000); /* wait for console output to finish */
306 }
307
308 print_uptime();
309
310 /*
311 * Ok, now do things that assume all filesystem activity has
312 * been completed.
313 */
314 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
315 splhigh();
316 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold)
317 dumpsys();
318
319 /* Now that we're going to really halt the system... */
320 EVENTHANDLER_INVOKE(shutdown_final, howto);
321
322 for(;;) ; /* safety against shutdown_reset not working */
323 /* NOTREACHED */
324}
325
326/*
327 * If the shutdown was a clean halt, behave accordingly.
328 */
329static void
330shutdown_halt(void *junk, int howto)
331{
332 if (howto & RB_HALT) {
333 printf("\n");
334 printf("The operating system has halted.\n");
335 printf("Please press any key to reboot.\n\n");
336 switch (cngetc()) {
337 case -1: /* No console, just die */
338 cpu_halt();
339 /* NOTREACHED */
340 default:
341 howto &= ~RB_HALT;
342 break;
343 }
344 }
345}
346
347/*
348 * Check to see if the system paniced, pause and then reboot
349 * according to the specified delay.
350 */
351static void
352shutdown_panic(void *junk, int howto)
353{
354 int loop;
355
356 if (howto & RB_DUMP) {
357 if (PANIC_REBOOT_WAIT_TIME != 0) {
358 if (PANIC_REBOOT_WAIT_TIME != -1) {
359 printf("Automatic reboot in %d seconds - "
360 "press a key on the console to abort\n",
361 PANIC_REBOOT_WAIT_TIME);
362 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
363 loop > 0; --loop) {
364 DELAY(1000 * 100); /* 1/10th second */
365 /* Did user type a key? */
366 if (cncheckc() != -1)
367 break;
368 }
369 if (!loop)
370 return;
371 }
372 } else { /* zero time specified - reboot NOW */
373 return;
374 }
375 printf("--> Press a key on the console to reboot,\n");
376 printf("--> or switch off the system now.\n");
377 cngetc();
378 }
379}
380
381/*
382 * Everything done, now reset
383 */
384static void
385shutdown_reset(void *junk, int howto)
386{
387 printf("Rebooting...\n");
388 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
389 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
390 cpu_reset();
391 /* NOTREACHED */ /* assuming reset worked */
392}
393
394/*
395 * Magic number for savecore
396 *
397 * exported (symorder) and used at least by savecore(8)
398 *
399 */
400static u_long const dumpmag = 0x8fca0101UL;
401
402static int dumpsize = 0; /* also for savecore */
403
404static int dodump = 1;
405
406SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
407 "Try to perform coredump on kernel panic");
408
409static int
410setdumpdev(dev)
411 dev_t dev;
412{
413 int psize;
414 long newdumplo;
415
416 if (dev == NODEV) {
417 dumpdev = dev;
418 return (0);
419 }
335dda38 420 psize = dev_dpsize(dev);
984263bc 421 if (psize == -1)
335dda38 422 return (ENXIO);
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423 /*
424 * XXX should clean up checking in dumpsys() to be more like this.
425 */
426 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE);
427 if (newdumplo <= LABELSECTOR)
428 return (ENOSPC);
429 dumpdev = dev;
430 dumplo = newdumplo;
431 return (0);
432}
433
434
435/* ARGSUSED */
402ed7e1 436static void dump_conf (void *dummy);
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437static void
438dump_conf(dummy)
439 void *dummy;
440{
441 char *path;
442 dev_t dev;
443
444 path = malloc(MNAMELEN, M_TEMP, M_WAITOK);
445 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
446 dev = getdiskbyname(path);
447 if (dev != NODEV)
448 dumpdev = dev;
449 }
450 free(path, M_TEMP);
451 if (setdumpdev(dumpdev) != 0)
452 dumpdev = NODEV;
453}
454
455SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
456
457static int
458sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
459{
460 int error;
461 udev_t ndumpdev;
462
463 ndumpdev = dev2udev(dumpdev);
464 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
465 if (error == 0 && req->newptr != NULL)
466 error = setdumpdev(udev2dev(ndumpdev, 0));
467 return (error);
468}
469
470SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
471 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
472
473/*
474 * Doadump comes here after turning off memory management and
475 * getting on the dump stack, either when called above, or by
476 * the auto-restart code.
477 */
478static void
479dumpsys(void)
480{
481 int error;
482
483 savectx(&dumppcb);
484 if (dumping++) {
485 printf("Dump already in progress, bailing...\n");
486 return;
487 }
488 if (!dodump)
489 return;
490 if (dumpdev == NODEV)
491 return;
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492 dumpsize = Maxmem;
493 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo);
494 printf("dump ");
335dda38 495 error = dev_ddump(dumpdev);
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496 if (error == 0) {
497 printf("succeeded\n");
498 return;
499 }
500 printf("failed, reason: ");
501 switch (error) {
335dda38 502 case ENOSYS:
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503 case ENODEV:
504 printf("device doesn't support a dump routine\n");
505 break;
506
507 case ENXIO:
508 printf("device bad\n");
509 break;
510
511 case EFAULT:
512 printf("device not ready\n");
513 break;
514
515 case EINVAL:
516 printf("area improper\n");
517 break;
518
519 case EIO:
520 printf("i/o error\n");
521 break;
522
523 case EINTR:
524 printf("aborted from console\n");
525 break;
526
527 default:
528 printf("unknown, error = %d\n", error);
529 break;
530 }
531}
532
533int
534dumpstatus(vm_offset_t addr, off_t count)
535{
536 int c;
537
538 if (addr % (1024 * 1024) == 0) {
539#ifdef HW_WDOG
540 if (wdog_tickler)
541 (*wdog_tickler)();
542#endif
543 printf("%ld ", (long)(count / (1024 * 1024)));
544 }
545
546 if ((c = cncheckc()) == 0x03)
547 return -1;
548 else if (c != -1)
549 printf("[CTRL-C to abort] ");
550
551 return 0;
552}
553
554/*
555 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
556 * and then reboots. If we are called twice, then we avoid trying to sync
557 * the disks as this often leads to recursive panics.
558 */
559void
560panic(const char *fmt, ...)
561{
562 int bootopt;
563 va_list ap;
564 static char buf[256];
565
566 bootopt = RB_AUTOBOOT | RB_DUMP;
567 if (panicstr)
568 bootopt |= RB_NOSYNC;
569 else
570 panicstr = fmt;
571
572 va_start(ap, fmt);
573 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
574 if (panicstr == fmt)
575 panicstr = buf;
576 va_end(ap);
577 printf("panic: %s\n", buf);
578#ifdef SMP
579 /* three seperate prints in case of an unmapped page and trap */
580 printf("mp_lock = %08x; ", mp_lock);
72740893 581 printf("cpuid = %d; ", mycpu->gd_cpuid);
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582 printf("lapic.id = %08x\n", lapic.id);
583#endif
584
585#if defined(DDB)
586 if (debugger_on_panic)
587 Debugger ("panic");
588#endif
589 boot(bootopt);
590}
591
592/*
593 * Support for poweroff delay.
594 */
595#ifndef POWEROFF_DELAY
596# define POWEROFF_DELAY 5000
597#endif
598static int poweroff_delay = POWEROFF_DELAY;
599
600SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
601 &poweroff_delay, 0, "");
602
603static void
604poweroff_wait(void *junk, int howto)
605{
606 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
607 return;
608 DELAY(poweroff_delay * 1000);
609}
610
611/*
612 * Some system processes (e.g. syncer) need to be stopped at appropriate
613 * points in their main loops prior to a system shutdown, so that they
614 * won't interfere with the shutdown process (e.g. by holding a disk buf
615 * to cause sync to fail). For each of these system processes, register
616 * shutdown_kproc() as a handler for one of shutdown events.
617 */
618static int kproc_shutdown_wait = 60;
619SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
620 &kproc_shutdown_wait, 0, "");
621
622void
623shutdown_kproc(void *arg, int howto)
624{
bc6dffab 625 struct thread *td;
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626 struct proc *p;
627 int error;
628
629 if (panicstr)
630 return;
631
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632 td = (struct thread *)arg;
633 if ((p = td->td_proc) != NULL) {
634 printf("Waiting (max %d seconds) for system process `%s' to stop...",
635 kproc_shutdown_wait, p->p_comm);
636 } else {
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637 printf("Waiting (max %d seconds) for system thread %s to stop...",
638 kproc_shutdown_wait, td->td_comm);
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639 }
640 error = suspend_kproc(td, kproc_shutdown_wait * hz);
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641
642 if (error == EWOULDBLOCK)
643 printf("timed out\n");
644 else
645 printf("stopped\n");
646}