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  * 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("$FreeBSD$");
   39 
   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 
   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
   93 int debugger_on_panic = 0;
   94 #else
   95 int debugger_on_panic = 1;
   96 #endif
   97 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
   98         &debugger_on_panic, 0, "Run debugger on kernel panic");
   99 
  100 #ifdef KDB_TRACE
  101 int trace_on_panic = 1;
  102 #else
  103 int trace_on_panic = 0;
  104 #endif
  105 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
  106         &trace_on_panic, 0, "Print stack trace on kernel panic");
  107 #endif /* KDB */
  108 
  109 int sync_on_panic = 0;
  110 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
  111         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  112 
  113 SYSCTL_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  */
  119 const char *panicstr;
  120 
  121 int dumping;                            /* system is dumping */
  122 int rebooting;                          /* system is rebooting */
  123 static struct dumperinfo dumper;        /* our selected dumper */
  124 
  125 /* Context information for dump-debuggers. */
  126 static struct pcb dumppcb;              /* Registers. */
  127 static lwpid_t dumptid;                 /* Thread ID. */
  128 
  129 static void boot(int) __dead2;
  130 static void poweroff_wait(void *, int);
  131 static void shutdown_halt(void *junk, int howto);
  132 static void shutdown_panic(void *junk, int howto);
  133 static void shutdown_reset(void *junk, int howto);
  134 
  135 /* register various local shutdown events */
  136 static void
  137 shutdown_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 
  150 SYSINIT(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 */
  156 int
  157 reboot(struct thread *td, struct reboot_args *uap)
  158 {
  159         int error;
  160 
  161         error = 0;
  162 #ifdef MAC
  163         error = mac_check_system_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  */
  178 static int shutdown_howto = 0;
  179 
  180 void
  181 shutdown_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 }
  197 static int      waittime = -1;
  198 
  199 static void
  200 print_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 
  226 static void
  227 doadump(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++;
  243         dumpsys(&dumper);
  244 }
  245 
  246 static int
  247 isbufbusy(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  */
  259 static void
  260 boot(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  */
  421 static void
  422 shutdown_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  */
  444 static void
  445 shutdown_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  */
  477 static void
  478 shutdown_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
  489 static 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  */
  497 void
  498 panic(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("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
  572 static int poweroff_delay = POWEROFF_DELAY;
  573 
  574 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  575         &poweroff_delay, 0, "");
  576 
  577 static void
  578 poweroff_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  */
  593 static int kproc_shutdown_wait = 60;
  594 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  595     &kproc_shutdown_wait, 0, "");
  596 
  597 void
  598 kproc_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 = kthread_suspend(p, kproc_shutdown_wait * hz);
  612 
  613         if (error == EWOULDBLOCK)
  614                 printf("timed out\n");
  615         else
  616                 printf("done\n");
  617 }
  618 
  619 /* Registration of dumpers */
  620 int
  621 set_dumper(struct dumperinfo *di)
  622 {
  623 
  624         if (di == NULL) {
  625                 bzero(&dumper, sizeof dumper);
  626                 return (0);
  627         }
  628         if (dumper.dumper != NULL)
  629                 return (EBUSY);
  630         dumper = *di;
  631         return (0);
  632 }
  633 
  634 /* Call dumper with bounds checking. */
  635 int
  636 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
  637     off_t offset, size_t length)
  638 {
  639 
  640         if (length != 0 && (offset < di->mediaoffset ||
  641             offset - di->mediaoffset + length > di->mediasize)) {
  642                 printf("Attempt to write outside dump device boundaries.\n");
  643                 return (ENXIO);
  644         }
  645         return (di->dumper(di->priv, virtual, physical, offset, length));
  646 }
  647 
  648 #if defined(__powerpc__)
  649 void
  650 dumpsys(struct dumperinfo *di __unused)
  651 {
  652 
  653         printf("Kernel dumps not implemented on this architecture\n");
  654 }
  655 #endif
Cache object: 849571a93ae31bac723a3e5fab317a19
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_shutdown.c

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