Update the systat manual page to reflect the new -ifstat option.
[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 $
b1e04573 40 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.12 2003/09/05 17:46:54 hsu 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>
3020e3be 67#include <sys/buf2.h>
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68
69#include <machine/pcb.h>
70#include <machine/clock.h>
71#include <machine/md_var.h>
72#include <machine/smp.h> /* smp_active, cpuid */
73
74#include <sys/signalvar.h>
75
76#ifndef PANIC_REBOOT_WAIT_TIME
77#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
78#endif
79
80/*
81 * Note that stdarg.h and the ANSI style va_start macro is used for both
82 * ANSI and traditional C compilers.
83 */
84#include <machine/stdarg.h>
85
86#ifdef DDB
87#ifdef DDB_UNATTENDED
88int debugger_on_panic = 0;
89#else
90int debugger_on_panic = 1;
91#endif
92SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
93 &debugger_on_panic, 0, "Run debugger on kernel panic");
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94
95extern void db_print_backtrace(void);
96
97#ifdef DDB_TRACE
98int trace_on_panic = 1;
99#else
100int trace_on_panic = 0;
101#endif
102SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
103 &trace_on_panic, 0, "Print stack trace on kernel panic");
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104#endif
105
106SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
107
108#ifdef HW_WDOG
109/*
110 * If there is a hardware watchdog, point this at the function needed to
111 * hold it off.
112 * It's needed when the kernel needs to do some lengthy operations.
113 * e.g. in wd.c when dumping core.. It's most annoying to have
114 * your precious core-dump only half written because the wdog kicked in.
115 */
116watchdog_tickle_fn wdog_tickler = NULL;
117#endif /* HW_WDOG */
118
119/*
120 * Variable panicstr contains argument to first call to panic; used as flag
121 * to indicate that the kernel has already called panic.
122 */
123const char *panicstr;
124
125int dumping; /* system is dumping */
126
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127static void boot (int) __dead2;
128static void dumpsys (void);
129static int setdumpdev (dev_t dev);
130static void poweroff_wait (void *, int);
131static void print_uptime (void);
132static void shutdown_halt (void *junk, int howto);
133static void shutdown_panic (void *junk, int howto);
134static void shutdown_reset (void *junk, int howto);
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135
136/* register various local shutdown events */
137static void
138shutdown_conf(void *unused)
139{
140 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
141 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
142 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
143 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
144}
145
146SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
147
148/* ARGSUSED */
149
150/*
151 * The system call that results in a reboot
152 */
153int
41c20dac 154reboot(struct reboot_args *uap)
984263bc 155{
dadab5e9 156 struct thread *td = curthread;
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157 int error;
158
dadab5e9 159 if ((error = suser(td)))
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160 return (error);
161
162 boot(uap->opt);
163 return (0);
164}
165
166/*
167 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
168 */
169static int shutdown_howto = 0;
170
171void
172shutdown_nice(int howto)
173{
174 shutdown_howto = howto;
175
176 /* Send a signal to init(8) and have it shutdown the world */
177 if (initproc != NULL) {
178 psignal(initproc, SIGINT);
179 } else {
180 /* No init(8) running, so simply reboot */
181 boot(RB_NOSYNC);
182 }
183 return;
184}
185static int waittime = -1;
186static struct pcb dumppcb;
187
188static void
189print_uptime()
190{
191 int f;
192 struct timespec ts;
193
194 getnanouptime(&ts);
195 printf("Uptime: ");
196 f = 0;
197 if (ts.tv_sec >= 86400) {
198 printf("%ldd", ts.tv_sec / 86400);
199 ts.tv_sec %= 86400;
200 f = 1;
201 }
202 if (f || ts.tv_sec >= 3600) {
203 printf("%ldh", ts.tv_sec / 3600);
204 ts.tv_sec %= 3600;
205 f = 1;
206 }
207 if (f || ts.tv_sec >= 60) {
208 printf("%ldm", ts.tv_sec / 60);
209 ts.tv_sec %= 60;
210 f = 1;
211 }
212 printf("%lds\n", ts.tv_sec);
213}
214
215/*
216 * Go through the rigmarole of shutting down..
217 * this used to be in machdep.c but I'll be dammned if I could see
218 * anything machine dependant in it.
219 */
220static void
41c20dac 221boot(int howto)
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222{
223
224 /* collect extra flags that shutdown_nice might have set */
225 howto |= shutdown_howto;
226
227#ifdef SMP
228 if (smp_active) {
72740893 229 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
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230 }
231#endif
232 /*
233 * Do any callouts that should be done BEFORE syncing the filesystems.
234 */
235 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
236
237 /*
238 * Now sync filesystems
239 */
240 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
1fd87d54 241 struct buf *bp;
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242 int iter, nbusy, pbusy;
243
244 waittime = 0;
245 printf("\nsyncing disks... ");
246
41c20dac 247 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
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248
249 /*
250 * With soft updates, some buffers that are
251 * written will be remarked as dirty until other
252 * buffers are written.
253 */
254 for (iter = pbusy = 0; iter < 20; iter++) {
255 nbusy = 0;
256 for (bp = &buf[nbuf]; --bp >= buf; ) {
257 if ((bp->b_flags & B_INVAL) == 0 &&
258 BUF_REFCNT(bp) > 0) {
259 nbusy++;
260 } else if ((bp->b_flags & (B_DELWRI | B_INVAL))
261 == B_DELWRI) {
262 /* bawrite(bp);*/
263 nbusy++;
264 }
265 }
266 if (nbusy == 0)
267 break;
268 printf("%d ", nbusy);
269 if (nbusy < pbusy)
270 iter = 0;
271 pbusy = nbusy;
272 if (iter > 5 && bioops.io_sync)
273 (*bioops.io_sync)(NULL);
41c20dac 274 sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
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275 DELAY(50000 * iter);
276 }
277 printf("\n");
278 /*
279 * Count only busy local buffers to prevent forcing
280 * a fsck if we're just a client of a wedged NFS server
281 */
282 nbusy = 0;
283 for (bp = &buf[nbuf]; --bp >= buf; ) {
284 if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
285 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
286 if (bp->b_dev == NODEV) {
287 TAILQ_REMOVE(&mountlist,
288 bp->b_vp->v_mount, mnt_list);
289 continue;
290 }
291 nbusy++;
292#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
293 printf(
294 "%p %d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n",
295 bp, nbusy, devtoname(bp->b_dev),
296 bp->b_flags, (long)bp->b_blkno,
297 (long)bp->b_lblkno);
298#endif
299 }
300 }
301 if (nbusy) {
302 /*
303 * Failed to sync all blocks. Indicate this and don't
304 * unmount filesystems (thus forcing an fsck on reboot).
305 */
306 printf("giving up on %d buffers\n", nbusy);
307 DELAY(5000000); /* 5 seconds */
308 } else {
309 printf("done\n");
310 /*
311 * Unmount filesystems
312 */
313 if (panicstr == 0)
314 vfs_unmountall();
315 }
316 DELAY(100000); /* wait for console output to finish */
317 }
318
319 print_uptime();
320
321 /*
322 * Ok, now do things that assume all filesystem activity has
323 * been completed.
324 */
325 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
326 splhigh();
327 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold)
328 dumpsys();
329
330 /* Now that we're going to really halt the system... */
331 EVENTHANDLER_INVOKE(shutdown_final, howto);
332
333 for(;;) ; /* safety against shutdown_reset not working */
334 /* NOTREACHED */
335}
336
337/*
338 * If the shutdown was a clean halt, behave accordingly.
339 */
340static void
341shutdown_halt(void *junk, int howto)
342{
343 if (howto & RB_HALT) {
344 printf("\n");
345 printf("The operating system has halted.\n");
346 printf("Please press any key to reboot.\n\n");
347 switch (cngetc()) {
348 case -1: /* No console, just die */
349 cpu_halt();
350 /* NOTREACHED */
351 default:
352 howto &= ~RB_HALT;
353 break;
354 }
355 }
356}
357
358/*
359 * Check to see if the system paniced, pause and then reboot
360 * according to the specified delay.
361 */
362static void
363shutdown_panic(void *junk, int howto)
364{
365 int loop;
366
367 if (howto & RB_DUMP) {
368 if (PANIC_REBOOT_WAIT_TIME != 0) {
369 if (PANIC_REBOOT_WAIT_TIME != -1) {
370 printf("Automatic reboot in %d seconds - "
371 "press a key on the console to abort\n",
372 PANIC_REBOOT_WAIT_TIME);
373 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
374 loop > 0; --loop) {
375 DELAY(1000 * 100); /* 1/10th second */
376 /* Did user type a key? */
377 if (cncheckc() != -1)
378 break;
379 }
380 if (!loop)
381 return;
382 }
383 } else { /* zero time specified - reboot NOW */
384 return;
385 }
386 printf("--> Press a key on the console to reboot,\n");
387 printf("--> or switch off the system now.\n");
388 cngetc();
389 }
390}
391
392/*
393 * Everything done, now reset
394 */
395static void
396shutdown_reset(void *junk, int howto)
397{
398 printf("Rebooting...\n");
399 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
400 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
401 cpu_reset();
402 /* NOTREACHED */ /* assuming reset worked */
403}
404
405/*
406 * Magic number for savecore
407 *
408 * exported (symorder) and used at least by savecore(8)
409 *
410 */
411static u_long const dumpmag = 0x8fca0101UL;
412
413static int dumpsize = 0; /* also for savecore */
414
415static int dodump = 1;
416
417SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
418 "Try to perform coredump on kernel panic");
419
420static int
421setdumpdev(dev)
422 dev_t dev;
423{
424 int psize;
425 long newdumplo;
426
427 if (dev == NODEV) {
428 dumpdev = dev;
429 return (0);
430 }
335dda38 431 psize = dev_dpsize(dev);
984263bc 432 if (psize == -1)
335dda38 433 return (ENXIO);
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434 /*
435 * XXX should clean up checking in dumpsys() to be more like this.
436 */
437 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE);
438 if (newdumplo <= LABELSECTOR)
439 return (ENOSPC);
440 dumpdev = dev;
441 dumplo = newdumplo;
442 return (0);
443}
444
445
446/* ARGSUSED */
402ed7e1 447static void dump_conf (void *dummy);
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448static void
449dump_conf(dummy)
450 void *dummy;
451{
452 char *path;
453 dev_t dev;
454
455 path = malloc(MNAMELEN, M_TEMP, M_WAITOK);
456 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) {
457 dev = getdiskbyname(path);
458 if (dev != NODEV)
459 dumpdev = dev;
460 }
461 free(path, M_TEMP);
462 if (setdumpdev(dumpdev) != 0)
463 dumpdev = NODEV;
464}
465
466SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
467
468static int
469sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
470{
471 int error;
472 udev_t ndumpdev;
473
474 ndumpdev = dev2udev(dumpdev);
475 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
476 if (error == 0 && req->newptr != NULL)
477 error = setdumpdev(udev2dev(ndumpdev, 0));
478 return (error);
479}
480
481SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
482 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
483
484/*
485 * Doadump comes here after turning off memory management and
486 * getting on the dump stack, either when called above, or by
487 * the auto-restart code.
488 */
489static void
490dumpsys(void)
491{
492 int error;
493
494 savectx(&dumppcb);
495 if (dumping++) {
496 printf("Dump already in progress, bailing...\n");
497 return;
498 }
499 if (!dodump)
500 return;
501 if (dumpdev == NODEV)
502 return;
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503 dumpsize = Maxmem;
504 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo);
505 printf("dump ");
335dda38 506 error = dev_ddump(dumpdev);
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507 if (error == 0) {
508 printf("succeeded\n");
509 return;
510 }
511 printf("failed, reason: ");
512 switch (error) {
335dda38 513 case ENOSYS:
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514 case ENODEV:
515 printf("device doesn't support a dump routine\n");
516 break;
517
518 case ENXIO:
519 printf("device bad\n");
520 break;
521
522 case EFAULT:
523 printf("device not ready\n");
524 break;
525
526 case EINVAL:
527 printf("area improper\n");
528 break;
529
530 case EIO:
531 printf("i/o error\n");
532 break;
533
534 case EINTR:
535 printf("aborted from console\n");
536 break;
537
538 default:
539 printf("unknown, error = %d\n", error);
540 break;
541 }
542}
543
544int
545dumpstatus(vm_offset_t addr, off_t count)
546{
547 int c;
548
549 if (addr % (1024 * 1024) == 0) {
550#ifdef HW_WDOG
551 if (wdog_tickler)
552 (*wdog_tickler)();
553#endif
554 printf("%ld ", (long)(count / (1024 * 1024)));
555 }
556
557 if ((c = cncheckc()) == 0x03)
558 return -1;
559 else if (c != -1)
560 printf("[CTRL-C to abort] ");
561
562 return 0;
563}
564
565/*
566 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
567 * and then reboots. If we are called twice, then we avoid trying to sync
568 * the disks as this often leads to recursive panics.
569 */
570void
571panic(const char *fmt, ...)
572{
b1e04573 573 int bootopt, newpanic;
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574 va_list ap;
575 static char buf[256];
576
577 bootopt = RB_AUTOBOOT | RB_DUMP;
b1e04573 578 newpanic = 0;
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579 if (panicstr)
580 bootopt |= RB_NOSYNC;
b1e04573 581 else {
984263bc 582 panicstr = fmt;
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583 newpanic = 1;
584 }
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585
586 va_start(ap, fmt);
587 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
588 if (panicstr == fmt)
589 panicstr = buf;
590 va_end(ap);
591 printf("panic: %s\n", buf);
592#ifdef SMP
593 /* three seperate prints in case of an unmapped page and trap */
594 printf("mp_lock = %08x; ", mp_lock);
72740893 595 printf("cpuid = %d; ", mycpu->gd_cpuid);
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596 printf("lapic.id = %08x\n", lapic.id);
597#endif
598
599#if defined(DDB)
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600 if (newpanic && trace_on_panic)
601 db_print_backtrace();
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602 if (debugger_on_panic)
603 Debugger ("panic");
604#endif
605 boot(bootopt);
606}
607
608/*
609 * Support for poweroff delay.
610 */
611#ifndef POWEROFF_DELAY
612# define POWEROFF_DELAY 5000
613#endif
614static int poweroff_delay = POWEROFF_DELAY;
615
616SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
617 &poweroff_delay, 0, "");
618
619static void
620poweroff_wait(void *junk, int howto)
621{
622 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0)
623 return;
624 DELAY(poweroff_delay * 1000);
625}
626
627/*
628 * Some system processes (e.g. syncer) need to be stopped at appropriate
629 * points in their main loops prior to a system shutdown, so that they
630 * won't interfere with the shutdown process (e.g. by holding a disk buf
631 * to cause sync to fail). For each of these system processes, register
632 * shutdown_kproc() as a handler for one of shutdown events.
633 */
634static int kproc_shutdown_wait = 60;
635SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
636 &kproc_shutdown_wait, 0, "");
637
638void
639shutdown_kproc(void *arg, int howto)
640{
bc6dffab 641 struct thread *td;
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642 struct proc *p;
643 int error;
644
645 if (panicstr)
646 return;
647
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648 td = (struct thread *)arg;
649 if ((p = td->td_proc) != NULL) {
650 printf("Waiting (max %d seconds) for system process `%s' to stop...",
651 kproc_shutdown_wait, p->p_comm);
652 } else {
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653 printf("Waiting (max %d seconds) for system thread %s to stop...",
654 kproc_shutdown_wait, td->td_comm);
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655 }
656 error = suspend_kproc(td, kproc_shutdown_wait * hz);
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657
658 if (error == EWOULDBLOCK)
659 printf("timed out\n");
660 else
661 printf("stopped\n");
662}