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 * 4. 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 */
36
37#include <sys/cdefs.h>
| 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 * 4. 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 */
36
37#include <sys/cdefs.h>
|
38__FBSDID("$FreeBSD: head/sys/kern/kern_shutdown.c 174898 2007-12-25 17:52:02Z rwatson $");
| 38__FBSDID("$FreeBSD: head/sys/kern/kern_shutdown.c 174921 2007-12-26 11:32:33Z rwatson $");
|
39
| 39
|
| 40#include "opt_ddb.h"
|
40#include "opt_kdb.h"
41#include "opt_mac.h"
42#include "opt_panic.h"
43#include "opt_show_busybufs.h"
44#include "opt_sched.h"
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/bio.h>
49#include <sys/buf.h>
50#include <sys/conf.h>
51#include <sys/cons.h>
52#include <sys/eventhandler.h>
53#include <sys/kdb.h>
54#include <sys/kernel.h>
55#include <sys/kthread.h>
56#include <sys/malloc.h>
57#include <sys/mount.h>
58#include <sys/priv.h>
59#include <sys/proc.h>
60#include <sys/reboot.h>
61#include <sys/resourcevar.h>
62#include <sys/sched.h>
63#include <sys/smp.h> /* smp_active */
64#include <sys/sysctl.h>
65#include <sys/sysproto.h>
66
| 41#include "opt_kdb.h"
42#include "opt_mac.h"
43#include "opt_panic.h"
44#include "opt_show_busybufs.h"
45#include "opt_sched.h"
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/bio.h>
50#include <sys/buf.h>
51#include <sys/conf.h>
52#include <sys/cons.h>
53#include <sys/eventhandler.h>
54#include <sys/kdb.h>
55#include <sys/kernel.h>
56#include <sys/kthread.h>
57#include <sys/malloc.h>
58#include <sys/mount.h>
59#include <sys/priv.h>
60#include <sys/proc.h>
61#include <sys/reboot.h>
62#include <sys/resourcevar.h>
63#include <sys/sched.h>
64#include <sys/smp.h> /* smp_active */
65#include <sys/sysctl.h>
66#include <sys/sysproto.h>
67
|
| 68#include <ddb/ddb.h>
69
|
67#include <machine/cpu.h>
68#include <machine/pcb.h>
69#include <machine/smp.h>
70
71#include <security/mac/mac_framework.h>
72
73#include <vm/vm.h>
74#include <vm/vm_object.h>
75#include <vm/vm_page.h>
76#include <vm/vm_pager.h>
77#include <vm/swap_pager.h>
78
79#include <sys/signalvar.h>
80
81#ifndef PANIC_REBOOT_WAIT_TIME
82#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
83#endif
84
85/*
86 * Note that stdarg.h and the ANSI style va_start macro is used for both
87 * ANSI and traditional C compilers.
88 */
89#include <machine/stdarg.h>
90
91#ifdef KDB
92#ifdef KDB_UNATTENDED
93int debugger_on_panic = 0;
94#else
95int debugger_on_panic = 1;
96#endif
97SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
98 &debugger_on_panic, 0, "Run debugger on kernel panic");
99
100#ifdef KDB_TRACE
101int trace_on_panic = 1;
102#else
103int trace_on_panic = 0;
104#endif
105SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
106 &trace_on_panic, 0, "Print stack trace on kernel panic");
107#endif /* KDB */
108
109int sync_on_panic = 0;
110SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
111 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
112
113SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
114
115/*
116 * Variable panicstr contains argument to first call to panic; used as flag
117 * to indicate that the kernel has already called panic.
118 */
119const char *panicstr;
120
121int dumping; /* system is dumping */
122int rebooting; /* system is rebooting */
123static struct dumperinfo dumper; /* our selected dumper */
124
125/* Context information for dump-debuggers. */
126static struct pcb dumppcb; /* Registers. */
127static lwpid_t dumptid; /* Thread ID. */
128
129static void boot(int) __dead2;
130static void poweroff_wait(void *, int);
131static void shutdown_halt(void *junk, int howto);
132static void shutdown_panic(void *junk, int howto);
133static void shutdown_reset(void *junk, int howto);
134
135/* register various local shutdown events */
136static void
137shutdown_conf(void *unused)
138{
139
140 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
141 SHUTDOWN_PRI_FIRST);
142 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
143 SHUTDOWN_PRI_LAST + 100);
144 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
145 SHUTDOWN_PRI_LAST + 100);
146 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
147 SHUTDOWN_PRI_LAST + 200);
148}
149
150SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
151
152/*
153 * The system call that results in a reboot.
154 */
155/* ARGSUSED */
156int
157reboot(struct thread *td, struct reboot_args *uap)
158{
159 int error;
160
161 error = 0;
162#ifdef MAC
163 error = mac_system_check_reboot(td->td_ucred, uap->opt);
164#endif
165 if (error == 0)
166 error = priv_check(td, PRIV_REBOOT);
167 if (error == 0) {
168 mtx_lock(&Giant);
169 boot(uap->opt);
170 mtx_unlock(&Giant);
171 }
172 return (error);
173}
174
175/*
176 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
177 */
178static int shutdown_howto = 0;
179
180void
181shutdown_nice(int howto)
182{
183
184 shutdown_howto = howto;
185
186 /* Send a signal to init(8) and have it shutdown the world */
187 if (initproc != NULL) {
188 PROC_LOCK(initproc);
189 psignal(initproc, SIGINT);
190 PROC_UNLOCK(initproc);
191 } else {
192 /* No init(8) running, so simply reboot */
193 boot(RB_NOSYNC);
194 }
195 return;
196}
197static int waittime = -1;
198
199static void
200print_uptime(void)
201{
202 int f;
203 struct timespec ts;
204
205 getnanouptime(&ts);
206 printf("Uptime: ");
207 f = 0;
208 if (ts.tv_sec >= 86400) {
209 printf("%ldd", (long)ts.tv_sec / 86400);
210 ts.tv_sec %= 86400;
211 f = 1;
212 }
213 if (f || ts.tv_sec >= 3600) {
214 printf("%ldh", (long)ts.tv_sec / 3600);
215 ts.tv_sec %= 3600;
216 f = 1;
217 }
218 if (f || ts.tv_sec >= 60) {
219 printf("%ldm", (long)ts.tv_sec / 60);
220 ts.tv_sec %= 60;
221 f = 1;
222 }
223 printf("%lds\n", (long)ts.tv_sec);
224}
225
226static void
227doadump(void)
228{
229
230 /*
231 * Sometimes people have to call this from the kernel debugger.
232 * (if 'panic' can not dump)
233 * Give them a clue as to why they can't dump.
234 */
235 if (dumper.dumper == NULL) {
236 printf("Cannot dump. No dump device defined.\n");
237 return;
238 }
239
240 savectx(&dumppcb);
241 dumptid = curthread->td_tid;
242 dumping++;
| 70#include <machine/cpu.h>
71#include <machine/pcb.h>
72#include <machine/smp.h>
73
74#include <security/mac/mac_framework.h>
75
76#include <vm/vm.h>
77#include <vm/vm_object.h>
78#include <vm/vm_page.h>
79#include <vm/vm_pager.h>
80#include <vm/swap_pager.h>
81
82#include <sys/signalvar.h>
83
84#ifndef PANIC_REBOOT_WAIT_TIME
85#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
86#endif
87
88/*
89 * Note that stdarg.h and the ANSI style va_start macro is used for both
90 * ANSI and traditional C compilers.
91 */
92#include <machine/stdarg.h>
93
94#ifdef KDB
95#ifdef KDB_UNATTENDED
96int debugger_on_panic = 0;
97#else
98int debugger_on_panic = 1;
99#endif
100SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
101 &debugger_on_panic, 0, "Run debugger on kernel panic");
102
103#ifdef KDB_TRACE
104int trace_on_panic = 1;
105#else
106int trace_on_panic = 0;
107#endif
108SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
109 &trace_on_panic, 0, "Print stack trace on kernel panic");
110#endif /* KDB */
111
112int sync_on_panic = 0;
113SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
114 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
115
116SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
117
118/*
119 * Variable panicstr contains argument to first call to panic; used as flag
120 * to indicate that the kernel has already called panic.
121 */
122const char *panicstr;
123
124int dumping; /* system is dumping */
125int rebooting; /* system is rebooting */
126static struct dumperinfo dumper; /* our selected dumper */
127
128/* Context information for dump-debuggers. */
129static struct pcb dumppcb; /* Registers. */
130static lwpid_t dumptid; /* Thread ID. */
131
132static void boot(int) __dead2;
133static void poweroff_wait(void *, int);
134static void shutdown_halt(void *junk, int howto);
135static void shutdown_panic(void *junk, int howto);
136static void shutdown_reset(void *junk, int howto);
137
138/* register various local shutdown events */
139static void
140shutdown_conf(void *unused)
141{
142
143 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
144 SHUTDOWN_PRI_FIRST);
145 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
146 SHUTDOWN_PRI_LAST + 100);
147 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
148 SHUTDOWN_PRI_LAST + 100);
149 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
150 SHUTDOWN_PRI_LAST + 200);
151}
152
153SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
154
155/*
156 * The system call that results in a reboot.
157 */
158/* ARGSUSED */
159int
160reboot(struct thread *td, struct reboot_args *uap)
161{
162 int error;
163
164 error = 0;
165#ifdef MAC
166 error = mac_system_check_reboot(td->td_ucred, uap->opt);
167#endif
168 if (error == 0)
169 error = priv_check(td, PRIV_REBOOT);
170 if (error == 0) {
171 mtx_lock(&Giant);
172 boot(uap->opt);
173 mtx_unlock(&Giant);
174 }
175 return (error);
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
187 shutdown_howto = howto;
188
189 /* Send a signal to init(8) and have it shutdown the world */
190 if (initproc != NULL) {
191 PROC_LOCK(initproc);
192 psignal(initproc, SIGINT);
193 PROC_UNLOCK(initproc);
194 } else {
195 /* No init(8) running, so simply reboot */
196 boot(RB_NOSYNC);
197 }
198 return;
199}
200static int waittime = -1;
201
202static void
203print_uptime(void)
204{
205 int f;
206 struct timespec ts;
207
208 getnanouptime(&ts);
209 printf("Uptime: ");
210 f = 0;
211 if (ts.tv_sec >= 86400) {
212 printf("%ldd", (long)ts.tv_sec / 86400);
213 ts.tv_sec %= 86400;
214 f = 1;
215 }
216 if (f || ts.tv_sec >= 3600) {
217 printf("%ldh", (long)ts.tv_sec / 3600);
218 ts.tv_sec %= 3600;
219 f = 1;
220 }
221 if (f || ts.tv_sec >= 60) {
222 printf("%ldm", (long)ts.tv_sec / 60);
223 ts.tv_sec %= 60;
224 f = 1;
225 }
226 printf("%lds\n", (long)ts.tv_sec);
227}
228
229static void
230doadump(void)
231{
232
233 /*
234 * Sometimes people have to call this from the kernel debugger.
235 * (if 'panic' can not dump)
236 * Give them a clue as to why they can't dump.
237 */
238 if (dumper.dumper == NULL) {
239 printf("Cannot dump. No dump device defined.\n");
240 return;
241 }
242
243 savectx(&dumppcb);
244 dumptid = curthread->td_tid;
245 dumping++;
|
243 dumpsys(&dumper);
| 246#ifdef DDB
247 if (textdump_pending)
248 textdump_dumpsys(&dumper);
249 else
250#endif
251 dumpsys(&dumper);
|
244}
245
246static int
247isbufbusy(struct buf *bp)
248{
249 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
250 BUF_REFCNT(bp) > 0) ||
251 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
252 return (1);
253 return (0);
254}
255
256/*
257 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
258 */
259static void
260boot(int howto)
261{
262 static int first_buf_printf = 1;
263
264#if defined(SMP)
265 /*
266 * Bind us to CPU 0 so that all shutdown code runs there. Some
267 * systems don't shutdown properly (i.e., ACPI power off) if we
268 * run on another processor.
269 */
270 thread_lock(curthread);
271 sched_bind(curthread, 0);
272 thread_unlock(curthread);
273 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
274#endif
275 /* We're in the process of rebooting. */
276 rebooting = 1;
277
278 /* collect extra flags that shutdown_nice might have set */
279 howto |= shutdown_howto;
280
281 /* We are out of the debugger now. */
282 kdb_active = 0;
283
284 /*
285 * Do any callouts that should be done BEFORE syncing the filesystems.
286 */
287 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
288
289 /*
290 * Now sync filesystems
291 */
292 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
293 register struct buf *bp;
294 int iter, nbusy, pbusy;
295#ifndef PREEMPTION
296 int subiter;
297#endif
298
299 waittime = 0;
300
301 sync(curthread, NULL);
302
303 /*
304 * With soft updates, some buffers that are
305 * written will be remarked as dirty until other
306 * buffers are written.
307 */
308 for (iter = pbusy = 0; iter < 20; iter++) {
309 nbusy = 0;
310 for (bp = &buf[nbuf]; --bp >= buf; )
311 if (isbufbusy(bp))
312 nbusy++;
313 if (nbusy == 0) {
314 if (first_buf_printf)
315 printf("All buffers synced.");
316 break;
317 }
318 if (first_buf_printf) {
319 printf("Syncing disks, buffers remaining... ");
320 first_buf_printf = 0;
321 }
322 printf("%d ", nbusy);
323 if (nbusy < pbusy)
324 iter = 0;
325 pbusy = nbusy;
326 sync(curthread, NULL);
327
328#ifdef PREEMPTION
329 /*
330 * Drop Giant and spin for a while to allow
331 * interrupt threads to run.
332 */
333 DROP_GIANT();
334 DELAY(50000 * iter);
335 PICKUP_GIANT();
336#else
337 /*
338 * Drop Giant and context switch several times to
339 * allow interrupt threads to run.
340 */
341 DROP_GIANT();
342 for (subiter = 0; subiter < 50 * iter; subiter++) {
343 thread_lock(curthread);
344 mi_switch(SW_VOL, NULL);
345 thread_unlock(curthread);
346 DELAY(1000);
347 }
348 PICKUP_GIANT();
349#endif
350 }
351 printf("\n");
352 /*
353 * Count only busy local buffers to prevent forcing
354 * a fsck if we're just a client of a wedged NFS server
355 */
356 nbusy = 0;
357 for (bp = &buf[nbuf]; --bp >= buf; ) {
358 if (isbufbusy(bp)) {
359#if 0
360/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
361 if (bp->b_dev == NULL) {
362 TAILQ_REMOVE(&mountlist,
363 bp->b_vp->v_mount, mnt_list);
364 continue;
365 }
366#endif
367 nbusy++;
368#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
369 printf(
370 "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
371 nbusy, bp->b_bufobj,
372 bp->b_flags, (long)bp->b_blkno,
373 (long)bp->b_lblkno);
374#endif
375 }
376 }
377 if (nbusy) {
378 /*
379 * Failed to sync all blocks. Indicate this and don't
380 * unmount filesystems (thus forcing an fsck on reboot).
381 */
382 printf("Giving up on %d buffers\n", nbusy);
383 DELAY(5000000); /* 5 seconds */
384 } else {
385 if (!first_buf_printf)
386 printf("Final sync complete\n");
387 /*
388 * Unmount filesystems
389 */
390 if (panicstr == 0)
391 vfs_unmountall();
392 }
393 swapoff_all();
394 DELAY(100000); /* wait for console output to finish */
395 }
396
397 print_uptime();
398
399 /*
400 * Ok, now do things that assume all filesystem activity has
401 * been completed.
402 */
403 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
404
405 /* XXX This doesn't disable interrupts any more. Reconsider? */
406 splhigh();
407
408 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
409 doadump();
410
411 /* Now that we're going to really halt the system... */
412 EVENTHANDLER_INVOKE(shutdown_final, howto);
413
414 for(;;) ; /* safety against shutdown_reset not working */
415 /* NOTREACHED */
416}
417
418/*
419 * If the shutdown was a clean halt, behave accordingly.
420 */
421static void
422shutdown_halt(void *junk, int howto)
423{
424
425 if (howto & RB_HALT) {
426 printf("\n");
427 printf("The operating system has halted.\n");
428 printf("Please press any key to reboot.\n\n");
429 switch (cngetc()) {
430 case -1: /* No console, just die */
431 cpu_halt();
432 /* NOTREACHED */
433 default:
434 howto &= ~RB_HALT;
435 break;
436 }
437 }
438}
439
440/*
441 * Check to see if the system paniced, pause and then reboot
442 * according to the specified delay.
443 */
444static void
445shutdown_panic(void *junk, int howto)
446{
447 int loop;
448
449 if (howto & RB_DUMP) {
450 if (PANIC_REBOOT_WAIT_TIME != 0) {
451 if (PANIC_REBOOT_WAIT_TIME != -1) {
452 printf("Automatic reboot in %d seconds - "
453 "press a key on the console to abort\n",
454 PANIC_REBOOT_WAIT_TIME);
455 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
456 loop > 0; --loop) {
457 DELAY(1000 * 100); /* 1/10th second */
458 /* Did user type a key? */
459 if (cncheckc() != -1)
460 break;
461 }
462 if (!loop)
463 return;
464 }
465 } else { /* zero time specified - reboot NOW */
466 return;
467 }
468 printf("--> Press a key on the console to reboot,\n");
469 printf("--> or switch off the system now.\n");
470 cngetc();
471 }
472}
473
474/*
475 * Everything done, now reset
476 */
477static void
478shutdown_reset(void *junk, int howto)
479{
480
481 printf("Rebooting...\n");
482 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
483 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
484 cpu_reset();
485 /* NOTREACHED */ /* assuming reset worked */
486}
487
488#ifdef SMP
489static u_int panic_cpu = NOCPU;
490#endif
491
492/*
493 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
494 * and then reboots. If we are called twice, then we avoid trying to sync
495 * the disks as this often leads to recursive panics.
496 */
497void
498panic(const char *fmt, ...)
499{
500 struct thread *td = curthread;
501 int bootopt, newpanic;
502 va_list ap;
503 static char buf[256];
504
505#ifdef SMP
506 /*
507 * We don't want multiple CPU's to panic at the same time, so we
508 * use panic_cpu as a simple spinlock. We have to keep checking
509 * panic_cpu if we are spinning in case the panic on the first
510 * CPU is canceled.
511 */
512 if (panic_cpu != PCPU_GET(cpuid))
513 while (atomic_cmpset_int(&panic_cpu, NOCPU,
514 PCPU_GET(cpuid)) == 0)
515 while (panic_cpu != NOCPU)
516 ; /* nothing */
517#endif
518
519 bootopt = RB_AUTOBOOT | RB_DUMP;
520 newpanic = 0;
521 if (panicstr)
522 bootopt |= RB_NOSYNC;
523 else {
524 panicstr = fmt;
525 newpanic = 1;
526 }
527
528 va_start(ap, fmt);
529 if (newpanic) {
530 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
531 panicstr = buf;
532 printf("panic: %s\n", buf);
533 } else {
534 printf("panic: ");
535 vprintf(fmt, ap);
536 printf("\n");
537 }
538 va_end(ap);
539#ifdef SMP
540 printf("cpuid = %d\n", PCPU_GET(cpuid));
541#endif
542
543#ifdef KDB
544 if (newpanic && trace_on_panic)
545 kdb_backtrace();
546 if (debugger_on_panic)
547 kdb_enter(KDB_WHY_PANIC, "panic");
548#ifdef RESTARTABLE_PANICS
549 /* See if the user aborted the panic, in which case we continue. */
550 if (panicstr == NULL) {
551#ifdef SMP
552 atomic_store_rel_int(&panic_cpu, NOCPU);
553#endif
554 return;
555 }
556#endif
557#endif
558 /*thread_lock(td); */
559 td->td_flags |= TDF_INPANIC;
560 /* thread_unlock(td); */
561 if (!sync_on_panic)
562 bootopt |= RB_NOSYNC;
563 boot(bootopt);
564}
565
566/*
567 * Support for poweroff delay.
568 */
569#ifndef POWEROFF_DELAY
570# define POWEROFF_DELAY 5000
571#endif
572static int poweroff_delay = POWEROFF_DELAY;
573
574SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
575 &poweroff_delay, 0, "");
576
577static void
578poweroff_wait(void *junk, int howto)
579{
580
581 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
582 return;
583 DELAY(poweroff_delay * 1000);
584}
585
586/*
587 * Some system processes (e.g. syncer) need to be stopped at appropriate
588 * points in their main loops prior to a system shutdown, so that they
589 * won't interfere with the shutdown process (e.g. by holding a disk buf
590 * to cause sync to fail). For each of these system processes, register
591 * shutdown_kproc() as a handler for one of shutdown events.
592 */
593static int kproc_shutdown_wait = 60;
594SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
595 &kproc_shutdown_wait, 0, "");
596
597void
598kproc_shutdown(void *arg, int howto)
599{
600 struct proc *p;
601 char procname[MAXCOMLEN + 1];
602 int error;
603
604 if (panicstr)
605 return;
606
607 p = (struct proc *)arg;
608 strlcpy(procname, p->p_comm, sizeof(procname));
609 printf("Waiting (max %d seconds) for system process `%s' to stop...",
610 kproc_shutdown_wait, procname);
611 error = kproc_suspend(p, kproc_shutdown_wait * hz);
612
613 if (error == EWOULDBLOCK)
614 printf("timed out\n");
615 else
616 printf("done\n");
617}
618
619void
620kthread_shutdown(void *arg, int howto)
621{
622 struct thread *td;
623 char procname[MAXCOMLEN + 1];
624 int error;
625
626 if (panicstr)
627 return;
628
629 td = (struct thread *)arg;
630 strlcpy(procname, td->td_name, sizeof(procname));
631 printf("Waiting (max %d seconds) for system thread `%s' to stop...",
632 kproc_shutdown_wait, procname);
633 error = kthread_suspend(td, kproc_shutdown_wait * hz);
634
635 if (error == EWOULDBLOCK)
636 printf("timed out\n");
637 else
638 printf("done\n");
639}
640
641/* Registration of dumpers */
642int
643set_dumper(struct dumperinfo *di)
644{
645
646 if (di == NULL) {
647 bzero(&dumper, sizeof dumper);
648 return (0);
649 }
650 if (dumper.dumper != NULL)
651 return (EBUSY);
652 dumper = *di;
653 return (0);
654}
655
656#if defined(__powerpc__)
657void
658dumpsys(struct dumperinfo *di __unused)
659{
660
661 printf("Kernel dumps not implemented on this architecture\n");
662}
663#endif
| 252}
253
254static int
255isbufbusy(struct buf *bp)
256{
257 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
258 BUF_REFCNT(bp) > 0) ||
259 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
260 return (1);
261 return (0);
262}
263
264/*
265 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
266 */
267static void
268boot(int howto)
269{
270 static int first_buf_printf = 1;
271
272#if defined(SMP)
273 /*
274 * Bind us to CPU 0 so that all shutdown code runs there. Some
275 * systems don't shutdown properly (i.e., ACPI power off) if we
276 * run on another processor.
277 */
278 thread_lock(curthread);
279 sched_bind(curthread, 0);
280 thread_unlock(curthread);
281 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
282#endif
283 /* We're in the process of rebooting. */
284 rebooting = 1;
285
286 /* collect extra flags that shutdown_nice might have set */
287 howto |= shutdown_howto;
288
289 /* We are out of the debugger now. */
290 kdb_active = 0;
291
292 /*
293 * Do any callouts that should be done BEFORE syncing the filesystems.
294 */
295 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
296
297 /*
298 * Now sync filesystems
299 */
300 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
301 register struct buf *bp;
302 int iter, nbusy, pbusy;
303#ifndef PREEMPTION
304 int subiter;
305#endif
306
307 waittime = 0;
308
309 sync(curthread, NULL);
310
311 /*
312 * With soft updates, some buffers that are
313 * written will be remarked as dirty until other
314 * buffers are written.
315 */
316 for (iter = pbusy = 0; iter < 20; iter++) {
317 nbusy = 0;
318 for (bp = &buf[nbuf]; --bp >= buf; )
319 if (isbufbusy(bp))
320 nbusy++;
321 if (nbusy == 0) {
322 if (first_buf_printf)
323 printf("All buffers synced.");
324 break;
325 }
326 if (first_buf_printf) {
327 printf("Syncing disks, buffers remaining... ");
328 first_buf_printf = 0;
329 }
330 printf("%d ", nbusy);
331 if (nbusy < pbusy)
332 iter = 0;
333 pbusy = nbusy;
334 sync(curthread, NULL);
335
336#ifdef PREEMPTION
337 /*
338 * Drop Giant and spin for a while to allow
339 * interrupt threads to run.
340 */
341 DROP_GIANT();
342 DELAY(50000 * iter);
343 PICKUP_GIANT();
344#else
345 /*
346 * Drop Giant and context switch several times to
347 * allow interrupt threads to run.
348 */
349 DROP_GIANT();
350 for (subiter = 0; subiter < 50 * iter; subiter++) {
351 thread_lock(curthread);
352 mi_switch(SW_VOL, NULL);
353 thread_unlock(curthread);
354 DELAY(1000);
355 }
356 PICKUP_GIANT();
357#endif
358 }
359 printf("\n");
360 /*
361 * Count only busy local buffers to prevent forcing
362 * a fsck if we're just a client of a wedged NFS server
363 */
364 nbusy = 0;
365 for (bp = &buf[nbuf]; --bp >= buf; ) {
366 if (isbufbusy(bp)) {
367#if 0
368/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
369 if (bp->b_dev == NULL) {
370 TAILQ_REMOVE(&mountlist,
371 bp->b_vp->v_mount, mnt_list);
372 continue;
373 }
374#endif
375 nbusy++;
376#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
377 printf(
378 "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
379 nbusy, bp->b_bufobj,
380 bp->b_flags, (long)bp->b_blkno,
381 (long)bp->b_lblkno);
382#endif
383 }
384 }
385 if (nbusy) {
386 /*
387 * Failed to sync all blocks. Indicate this and don't
388 * unmount filesystems (thus forcing an fsck on reboot).
389 */
390 printf("Giving up on %d buffers\n", nbusy);
391 DELAY(5000000); /* 5 seconds */
392 } else {
393 if (!first_buf_printf)
394 printf("Final sync complete\n");
395 /*
396 * Unmount filesystems
397 */
398 if (panicstr == 0)
399 vfs_unmountall();
400 }
401 swapoff_all();
402 DELAY(100000); /* wait for console output to finish */
403 }
404
405 print_uptime();
406
407 /*
408 * Ok, now do things that assume all filesystem activity has
409 * been completed.
410 */
411 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
412
413 /* XXX This doesn't disable interrupts any more. Reconsider? */
414 splhigh();
415
416 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
417 doadump();
418
419 /* Now that we're going to really halt the system... */
420 EVENTHANDLER_INVOKE(shutdown_final, howto);
421
422 for(;;) ; /* safety against shutdown_reset not working */
423 /* NOTREACHED */
424}
425
426/*
427 * If the shutdown was a clean halt, behave accordingly.
428 */
429static void
430shutdown_halt(void *junk, int howto)
431{
432
433 if (howto & RB_HALT) {
434 printf("\n");
435 printf("The operating system has halted.\n");
436 printf("Please press any key to reboot.\n\n");
437 switch (cngetc()) {
438 case -1: /* No console, just die */
439 cpu_halt();
440 /* NOTREACHED */
441 default:
442 howto &= ~RB_HALT;
443 break;
444 }
445 }
446}
447
448/*
449 * Check to see if the system paniced, pause and then reboot
450 * according to the specified delay.
451 */
452static void
453shutdown_panic(void *junk, int howto)
454{
455 int loop;
456
457 if (howto & RB_DUMP) {
458 if (PANIC_REBOOT_WAIT_TIME != 0) {
459 if (PANIC_REBOOT_WAIT_TIME != -1) {
460 printf("Automatic reboot in %d seconds - "
461 "press a key on the console to abort\n",
462 PANIC_REBOOT_WAIT_TIME);
463 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
464 loop > 0; --loop) {
465 DELAY(1000 * 100); /* 1/10th second */
466 /* Did user type a key? */
467 if (cncheckc() != -1)
468 break;
469 }
470 if (!loop)
471 return;
472 }
473 } else { /* zero time specified - reboot NOW */
474 return;
475 }
476 printf("--> Press a key on the console to reboot,\n");
477 printf("--> or switch off the system now.\n");
478 cngetc();
479 }
480}
481
482/*
483 * Everything done, now reset
484 */
485static void
486shutdown_reset(void *junk, int howto)
487{
488
489 printf("Rebooting...\n");
490 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
491 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
492 cpu_reset();
493 /* NOTREACHED */ /* assuming reset worked */
494}
495
496#ifdef SMP
497static u_int panic_cpu = NOCPU;
498#endif
499
500/*
501 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
502 * and then reboots. If we are called twice, then we avoid trying to sync
503 * the disks as this often leads to recursive panics.
504 */
505void
506panic(const char *fmt, ...)
507{
508 struct thread *td = curthread;
509 int bootopt, newpanic;
510 va_list ap;
511 static char buf[256];
512
513#ifdef SMP
514 /*
515 * We don't want multiple CPU's to panic at the same time, so we
516 * use panic_cpu as a simple spinlock. We have to keep checking
517 * panic_cpu if we are spinning in case the panic on the first
518 * CPU is canceled.
519 */
520 if (panic_cpu != PCPU_GET(cpuid))
521 while (atomic_cmpset_int(&panic_cpu, NOCPU,
522 PCPU_GET(cpuid)) == 0)
523 while (panic_cpu != NOCPU)
524 ; /* nothing */
525#endif
526
527 bootopt = RB_AUTOBOOT | RB_DUMP;
528 newpanic = 0;
529 if (panicstr)
530 bootopt |= RB_NOSYNC;
531 else {
532 panicstr = fmt;
533 newpanic = 1;
534 }
535
536 va_start(ap, fmt);
537 if (newpanic) {
538 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
539 panicstr = buf;
540 printf("panic: %s\n", buf);
541 } else {
542 printf("panic: ");
543 vprintf(fmt, ap);
544 printf("\n");
545 }
546 va_end(ap);
547#ifdef SMP
548 printf("cpuid = %d\n", PCPU_GET(cpuid));
549#endif
550
551#ifdef KDB
552 if (newpanic && trace_on_panic)
553 kdb_backtrace();
554 if (debugger_on_panic)
555 kdb_enter(KDB_WHY_PANIC, "panic");
556#ifdef RESTARTABLE_PANICS
557 /* See if the user aborted the panic, in which case we continue. */
558 if (panicstr == NULL) {
559#ifdef SMP
560 atomic_store_rel_int(&panic_cpu, NOCPU);
561#endif
562 return;
563 }
564#endif
565#endif
566 /*thread_lock(td); */
567 td->td_flags |= TDF_INPANIC;
568 /* thread_unlock(td); */
569 if (!sync_on_panic)
570 bootopt |= RB_NOSYNC;
571 boot(bootopt);
572}
573
574/*
575 * Support for poweroff delay.
576 */
577#ifndef POWEROFF_DELAY
578# define POWEROFF_DELAY 5000
579#endif
580static int poweroff_delay = POWEROFF_DELAY;
581
582SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
583 &poweroff_delay, 0, "");
584
585static void
586poweroff_wait(void *junk, int howto)
587{
588
589 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
590 return;
591 DELAY(poweroff_delay * 1000);
592}
593
594/*
595 * Some system processes (e.g. syncer) need to be stopped at appropriate
596 * points in their main loops prior to a system shutdown, so that they
597 * won't interfere with the shutdown process (e.g. by holding a disk buf
598 * to cause sync to fail). For each of these system processes, register
599 * shutdown_kproc() as a handler for one of shutdown events.
600 */
601static int kproc_shutdown_wait = 60;
602SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
603 &kproc_shutdown_wait, 0, "");
604
605void
606kproc_shutdown(void *arg, int howto)
607{
608 struct proc *p;
609 char procname[MAXCOMLEN + 1];
610 int error;
611
612 if (panicstr)
613 return;
614
615 p = (struct proc *)arg;
616 strlcpy(procname, p->p_comm, sizeof(procname));
617 printf("Waiting (max %d seconds) for system process `%s' to stop...",
618 kproc_shutdown_wait, procname);
619 error = kproc_suspend(p, kproc_shutdown_wait * hz);
620
621 if (error == EWOULDBLOCK)
622 printf("timed out\n");
623 else
624 printf("done\n");
625}
626
627void
628kthread_shutdown(void *arg, int howto)
629{
630 struct thread *td;
631 char procname[MAXCOMLEN + 1];
632 int error;
633
634 if (panicstr)
635 return;
636
637 td = (struct thread *)arg;
638 strlcpy(procname, td->td_name, sizeof(procname));
639 printf("Waiting (max %d seconds) for system thread `%s' to stop...",
640 kproc_shutdown_wait, procname);
641 error = kthread_suspend(td, kproc_shutdown_wait * hz);
642
643 if (error == EWOULDBLOCK)
644 printf("timed out\n");
645 else
646 printf("done\n");
647}
648
649/* Registration of dumpers */
650int
651set_dumper(struct dumperinfo *di)
652{
653
654 if (di == NULL) {
655 bzero(&dumper, sizeof dumper);
656 return (0);
657 }
658 if (dumper.dumper != NULL)
659 return (EBUSY);
660 dumper = *di;
661 return (0);
662}
663
664#if defined(__powerpc__)
665void
666dumpsys(struct dumperinfo *di __unused)
667{
668
669 printf("Kernel dumps not implemented on this architecture\n");
670}
671#endif
|