kern_shutdown.c

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

FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_shutdown.c
