1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /*
27 * Copyright 2019 Joyent, Inc.
28 */
29
30 /*
31 * This module contains the guts of checkpoint-resume mechanism.
32 * All code in this module is platform independent.
33 */
34
35 #include <sys/types.h>
36 #include <sys/errno.h>
37 #include <sys/callb.h>
38 #include <sys/processor.h>
39 #include <sys/machsystm.h>
40 #include <sys/clock.h>
41 #include <sys/vfs.h>
42 #include <sys/kmem.h>
43 #include <nfs/lm.h>
44 #include <sys/systm.h>
45 #include <sys/cpr.h>
46 #include <sys/bootconf.h>
47 #include <sys/cyclic.h>
48 #include <sys/filio.h>
49 #include <sys/fs/ufs_filio.h>
50 #include <sys/epm.h>
51 #include <sys/modctl.h>
52 #include <sys/reboot.h>
53 #include <sys/kdi.h>
54 #include <sys/promif.h>
55 #include <sys/srn.h>
56 #include <sys/cpr_impl.h>
57
58 #define PPM(dip) ((dev_info_t *)DEVI(dip)->devi_pm_ppm)
59
60 extern struct cpr_terminator cpr_term;
61
62 extern int cpr_alloc_statefile(int);
63 extern void cpr_start_kernel_threads(void);
64 extern void cpr_abbreviate_devpath(char *, char *);
65 extern void cpr_convert_promtime(cpr_time_t *);
66 extern void cpr_send_notice(void);
67 extern void cpr_set_bitmap_size(void);
68 extern void cpr_stat_init();
69 extern void cpr_statef_close(void);
70 extern void flush_windows(void);
71 extern void (*srn_signal)(int, int);
72 extern void init_cpu_syscall(struct cpu *);
73 extern void i_cpr_pre_resume_cpus();
74 extern void i_cpr_post_resume_cpus();
75 extern int cpr_is_ufs(struct vfs *);
76
77 extern int pm_powering_down;
78 extern kmutex_t srn_clone_lock;
79 extern int srn_inuse;
80
81 static int cpr_suspend(int);
82 static int cpr_resume(int);
83 static void cpr_suspend_init(int);
84 #if defined(__x86)
85 static int cpr_suspend_cpus(void);
86 static void cpr_resume_cpus(void);
87 #endif
88 static int cpr_all_online(void);
89 static void cpr_restore_offline(void);
90
91 cpr_time_t wholecycle_tv;
92 int cpr_suspend_succeeded;
93 pfn_t curthreadpfn;
94 int curthreadremapped;
95
96 extern cpuset_t cpu_ready_set;
97
98 extern processorid_t i_cpr_bootcpuid(void);
99 extern cpu_t *i_cpr_bootcpu(void);
100 extern void tsc_adjust_delta(hrtime_t tdelta);
101 extern void tsc_resume(void);
102 extern int tsc_resume_in_cyclic;
103
104 /*
105 * Set this variable to 1, to have device drivers resume in an
106 * uniprocessor environment. This is to allow drivers that assume
107 * that they resume on a UP machine to continue to work. Should be
108 * deprecated once the broken drivers are fixed
109 */
110 int cpr_resume_uniproc = 0;
111
112 /*
113 * save or restore abort_enable; this prevents a drop
114 * to kadb or prom during cpr_resume_devices() when
115 * there is no kbd present; see abort_sequence_enter()
116 */
117 static void
cpr_sae(int stash)118 cpr_sae(int stash)
119 {
120 static int saved_ae = -1;
121
122 if (stash) {
123 saved_ae = abort_enable;
124 abort_enable = 0;
125 } else if (saved_ae != -1) {
126 abort_enable = saved_ae;
127 saved_ae = -1;
128 }
129 }
130
131
132 /*
133 * The main switching point for cpr, this routine starts the ckpt
134 * and state file saving routines; on resume the control is
135 * returned back to here and it then calls the resume routine.
136 */
137 int
cpr_main(int sleeptype)138 cpr_main(int sleeptype)
139 {
140 int rc, rc2;
141 label_t saveq;
142 klwp_t *tlwp = ttolwp(curthread);
143
144 if (sleeptype == CPR_TODISK) {
145 if ((rc = cpr_default_setup(1)) != 0)
146 return (rc);
147 ASSERT(tlwp);
148 saveq = tlwp->lwp_qsav;
149 }
150
151 if (sleeptype == CPR_TORAM) {
152 rc = cpr_suspend(sleeptype);
153 PMD(PMD_SX, ("cpr_suspend rets %x\n", rc))
154 if (rc == 0) {
155 int i_cpr_power_down(int sleeptype);
156
157 /*
158 * From this point on, we should be at a high
159 * spl, interrupts disabled, and all but one
160 * cpu's paused (effectively UP/single threaded).
161 * So this is were we want to put ASSERTS()
162 * to let us know otherwise.
163 */
164 ASSERT(cpus_paused());
165
166 /*
167 * Now do the work of actually putting this
168 * machine to sleep!
169 */
170 rc = i_cpr_power_down(sleeptype);
171 if (rc == 0) {
172 PMD(PMD_SX, ("back from successful suspend\n"))
173 }
174 /*
175 * We do care about the return value from cpr_resume
176 * at this point, as it will tell us if one of the
177 * resume functions failed (cpr_resume_devices())
178 * However, for this to return and _not_ panic, means
179 * that we must be in one of the test functions. So
180 * check for that and return an appropriate message.
181 */
182 rc2 = cpr_resume(sleeptype);
183 if (rc2 != 0) {
184 ASSERT(cpr_test_point > 0);
185 cmn_err(CE_NOTE,
186 "cpr_resume returned non-zero: %d\n", rc2);
187 PMD(PMD_SX, ("cpr_resume rets %x\n", rc2))
188 }
189 ASSERT(!cpus_paused());
190 } else {
191 PMD(PMD_SX, ("failed suspend, resuming\n"))
192 rc = cpr_resume(sleeptype);
193 }
194 return (rc);
195 }
196 /*
197 * Remember where we are for resume after reboot
198 */
199 if (!setjmp(&tlwp->lwp_qsav)) {
200 /*
201 * try to checkpoint the system, if failed return back
202 * to userland, otherwise power off.
203 */
204 rc = cpr_suspend(sleeptype);
205 if (rc || cpr_reusable_mode) {
206 /*
207 * We don't really want to go down, or
208 * something went wrong in suspend, do what we can
209 * to put the system back to an operable state then
210 * return back to userland.
211 */
212 PMD(PMD_SX, ("failed suspend, resuming\n"))
213 (void) cpr_resume(sleeptype);
214 PMD(PMD_SX, ("back from failed suspend resume\n"))
215 }
216 } else {
217 /*
218 * This is the resumed side of longjmp, restore the previous
219 * longjmp pointer if there is one so this will be transparent
220 * to the world.
221 * This path is only for CPR_TODISK, where we reboot
222 */
223 ASSERT(sleeptype == CPR_TODISK);
224 tlwp->lwp_qsav = saveq;
225 CPR->c_flags &= ~C_SUSPENDING;
226 CPR->c_flags |= C_RESUMING;
227
228 /*
229 * resume the system back to the original state
230 */
231 rc = cpr_resume(sleeptype);
232 PMD(PMD_SX, ("back from successful suspend; resume rets %x\n",
233 rc))
234 }
235
236 (void) cpr_default_setup(0);
237
238 return (rc);
239 }
240
241
242 #if defined(__sparc)
243
244 /*
245 * check/disable or re-enable UFS logging
246 */
247 static void
cpr_log_status(int enable,int * svstat,vnode_t * vp)248 cpr_log_status(int enable, int *svstat, vnode_t *vp)
249 {
250 int cmd, status, error;
251 char *str, *able;
252 fiolog_t fl;
253 refstr_t *mntpt;
254
255 str = "cpr_log_status";
256 bzero(&fl, sizeof (fl));
257 fl.error = FIOLOG_ENONE;
258
259 /*
260 * when disabling, first get and save logging status (0 or 1)
261 */
262 if (enable == 0) {
263 if (error = VOP_IOCTL(vp, _FIOISLOG,
264 (uintptr_t)&status, FKIOCTL, CRED(), NULL, NULL)) {
265 mntpt = vfs_getmntpoint(vp->v_vfsp);
266 prom_printf("%s: \"%s\", cant get logging "
267 "status, error %d\n", str, refstr_value(mntpt),
268 error);
269 refstr_rele(mntpt);
270 return;
271 }
272 *svstat = status;
273 if (cpr_debug & CPR_DEBUG5) {
274 mntpt = vfs_getmntpoint(vp->v_vfsp);
275 errp("%s: \"%s\", logging status = %d\n",
276 str, refstr_value(mntpt), status);
277 refstr_rele(mntpt);
278 };
279
280 able = "disable";
281 cmd = _FIOLOGDISABLE;
282 } else {
283 able = "enable";
284 cmd = _FIOLOGENABLE;
285 }
286
287 /*
288 * disable or re-enable logging when the saved status is 1
289 */
290 if (*svstat == 1) {
291 error = VOP_IOCTL(vp, cmd, (uintptr_t)&fl,
292 FKIOCTL, CRED(), NULL, NULL);
293 if (error) {
294 mntpt = vfs_getmntpoint(vp->v_vfsp);
295 prom_printf("%s: \"%s\", cant %s logging, error %d\n",
296 str, refstr_value(mntpt), able, error);
297 refstr_rele(mntpt);
298 } else {
299 if (cpr_debug & CPR_DEBUG5) {
300 mntpt = vfs_getmntpoint(vp->v_vfsp);
301 errp("%s: \"%s\", logging is now %sd\n",
302 str, refstr_value(mntpt), able);
303 refstr_rele(mntpt);
304 };
305 }
306 }
307
308 /*
309 * when enabling logging, reset the saved status
310 * to unknown for next time
311 */
312 if (enable)
313 *svstat = -1;
314 }
315
316 /*
317 * enable/disable UFS logging on filesystems containing cpr_default_path
318 * and cpr statefile. since the statefile can be on any fs, that fs
319 * needs to be handled separately. this routine and cprboot expect that
320 * CPR_CONFIG and CPR_DEFAULT both reside on the same fs, rootfs. cprboot
321 * is loaded from the device with rootfs and uses the same device to open
322 * both CPR_CONFIG and CPR_DEFAULT (see common/support.c). moving either
323 * file outside of rootfs would cause errors during cprboot, plus cpr and
324 * fsck problems with the new fs if logging were enabled.
325 */
326
327 static int
cpr_ufs_logging(int enable)328 cpr_ufs_logging(int enable)
329 {
330 static int def_status = -1, sf_status = -1;
331 struct vfs *vfsp;
332 char *fname;
333 vnode_t *vp;
334 int error;
335
336 if (cpr_reusable_mode)
337 return (0);
338
339 if (error = cpr_open_deffile(FREAD, &vp))
340 return (error);
341 vfsp = vp->v_vfsp;
342 if (!cpr_is_ufs(vfsp)) {
343 (void) VOP_CLOSE(vp, FREAD, 1, (offset_t)0, CRED(), NULL);
344 VN_RELE(vp);
345 return (0);
346 }
347
348 cpr_log_status(enable, &def_status, vp);
349 (void) VOP_CLOSE(vp, FREAD, 1, (offset_t)0, CRED(), NULL);
350 VN_RELE(vp);
351
352 fname = cpr_build_statefile_path();
353 if (fname == NULL)
354 return (ENOENT);
355 if (error = vn_open(fname, UIO_SYSSPACE, FCREAT|FWRITE,
356 0600, &vp, CRCREAT, 0)) {
357 prom_printf("cpr_ufs_logging: cant open/create \"%s\", "
358 "error %d\n", fname, error);
359 return (error);
360 }
361
362 /*
363 * check logging status for the statefile if it resides
364 * on a different fs and the type is a regular file
365 */
366 if (vp->v_vfsp != vfsp && vp->v_type == VREG)
367 cpr_log_status(enable, &sf_status, vp);
368 (void) VOP_CLOSE(vp, FWRITE, 1, (offset_t)0, CRED(), NULL);
369 VN_RELE(vp);
370
371 return (0);
372 }
373 #endif
374
375
376 /*
377 * Check if klmmod is loaded and call a lock manager service; if klmmod
378 * is not loaded, the services aren't needed and a call would trigger a
379 * modload, which would block since another thread would never run.
380 */
381 static void
cpr_lock_mgr(void (* service)(void))382 cpr_lock_mgr(void (*service)(void))
383 {
384 if (mod_find_by_filename(NULL, "misc/klmmod") != NULL)
385 (*service)();
386 }
387
388 int
cpr_suspend_cpus(void)389 cpr_suspend_cpus(void)
390 {
391 int ret = 0;
392 extern void *i_cpr_save_context(void *arg);
393
394 mutex_enter(&cpu_lock);
395
396 /*
397 * the machine could not have booted without a bootcpu
398 */
399 ASSERT(i_cpr_bootcpu() != NULL);
400
401 /*
402 * bring all the offline cpus online
403 */
404 if ((ret = cpr_all_online())) {
405 mutex_exit(&cpu_lock);
406 return (ret);
407 }
408
409 /*
410 * Set the affinity to be the boot processor
411 * This is cleared in either cpr_resume_cpus() or cpr_unpause_cpus()
412 */
413 affinity_set(i_cpr_bootcpuid());
414
415 ASSERT(CPU->cpu_id == 0);
416
417 PMD(PMD_SX, ("curthread running on bootcpu\n"))
418
419 /*
420 * pause all other running CPUs and save the CPU state at the sametime
421 */
422 pause_cpus(NULL, i_cpr_save_context);
423
424 mutex_exit(&cpu_lock);
425
426 return (0);
427 }
428
429 /*
430 * Take the system down to a checkpointable state and write
431 * the state file, the following are sequentially executed:
432 *
433 * - Request all user threads to stop themselves
434 * - push out and invalidate user pages
435 * - bring statefile inode incore to prevent a miss later
436 * - request all daemons to stop
437 * - check and make sure all threads are stopped
438 * - sync the file system
439 * - suspend all devices
440 * - block intrpts
441 * - dump system state and memory to state file
442 * - SPARC code will not be called with CPR_TORAM, caller filters
443 */
444 static int
cpr_suspend(int sleeptype)445 cpr_suspend(int sleeptype)
446 {
447 #if defined(__sparc)
448 int sf_realloc, nverr;
449 #endif
450 int rc = 0;
451 int skt_rc = 0;
452
453 PMD(PMD_SX, ("cpr_suspend %x\n", sleeptype))
454 cpr_set_substate(C_ST_SUSPEND_BEGIN);
455
456 cpr_suspend_init(sleeptype);
457
458 cpr_save_time();
459
460 cpr_tod_get(&wholecycle_tv);
461 CPR_STAT_EVENT_START("Suspend Total");
462
463 i_cpr_alloc_cpus();
464
465 #if defined(__sparc)
466 ASSERT(sleeptype == CPR_TODISK);
467 if (!cpr_reusable_mode) {
468 /*
469 * We need to validate default file before fs
470 * functionality is disabled.
471 */
472 if (rc = cpr_validate_definfo(0))
473 return (rc);
474 }
475 i_cpr_save_machdep_info();
476 #endif
477
478 PMD(PMD_SX, ("cpr_suspend: stop scans\n"))
479 /* Stop PM scans ASAP */
480 (void) callb_execute_class(CB_CL_CPR_PM, CB_CODE_CPR_CHKPT);
481
482 pm_dispatch_to_dep_thread(PM_DEP_WK_CPR_SUSPEND,
483 NULL, NULL, PM_DEP_WAIT, NULL, 0);
484
485 #if defined(__sparc)
486 ASSERT(sleeptype == CPR_TODISK);
487 cpr_set_substate(C_ST_MP_OFFLINE);
488 if (rc = cpr_mp_offline())
489 return (rc);
490 #endif
491 /*
492 * Ask Xorg to suspend the frame buffer, and wait for it to happen
493 */
494 mutex_enter(&srn_clone_lock);
495 if (srn_signal) {
496 PMD(PMD_SX, ("cpr_suspend: (*srn_signal)(..., "
497 "SRN_SUSPEND_REQ)\n"))
498 srn_inuse = 1; /* because *(srn_signal) cv_waits */
499 (*srn_signal)(SRN_TYPE_APM, SRN_SUSPEND_REQ);
500 srn_inuse = 0;
501 } else {
502 PMD(PMD_SX, ("cpr_suspend: srn_signal NULL\n"))
503 }
504 mutex_exit(&srn_clone_lock);
505
506 /*
507 * Ask the user threads to stop by themselves, but
508 * if they don't or can't after 3 retries, we give up on CPR.
509 * The 3 retry is not a random number because 2 is possible if
510 * a thread has been forked before the parent thread is stopped.
511 */
512 CPR_DEBUG(CPR_DEBUG1, "\nstopping user threads...");
513 CPR_STAT_EVENT_START(" stop users");
514 cpr_set_substate(C_ST_STOP_USER_THREADS);
515 PMD(PMD_SX, ("cpr_suspend: stop user threads\n"))
516 if (rc = cpr_stop_user_threads())
517 return (rc);
518 CPR_STAT_EVENT_END(" stop users");
519 CPR_DEBUG(CPR_DEBUG1, "done\n");
520
521 PMD(PMD_SX, ("cpr_suspend: save direct levels\n"))
522 pm_save_direct_levels();
523
524 /*
525 * User threads are stopped. We will start communicating with the
526 * user via prom_printf (some debug output may have already happened)
527 * so let anybody who cares know about this (bug 4096122)
528 */
529 (void) callb_execute_class(CB_CL_CPR_PROMPRINTF, CB_CODE_CPR_CHKPT);
530
531 PMD(PMD_SX, ("cpr_suspend: send notice\n"))
532 #ifndef DEBUG
533 cpr_send_notice();
534 if (cpr_debug)
535 prom_printf("\n");
536 #endif
537
538 PMD(PMD_SX, ("cpr_suspend: POST USER callback\n"))
539 (void) callb_execute_class(CB_CL_CPR_POST_USER, CB_CODE_CPR_CHKPT);
540
541 /*
542 * Reattach any drivers which originally exported the
543 * no-involuntary-power-cycles property. We need to do this before
544 * stopping kernel threads because modload is implemented using
545 * a kernel thread.
546 */
547 cpr_set_substate(C_ST_PM_REATTACH_NOINVOL);
548 PMD(PMD_SX, ("cpr_suspend: reattach noinvol\n"))
549 if (!pm_reattach_noinvol())
550 return (ENXIO);
551
552 #if defined(__sparc)
553 ASSERT(sleeptype == CPR_TODISK);
554 /*
555 * if ufs logging is enabled, we need to disable before
556 * stopping kernel threads so that ufs delete and roll
557 * threads can do the work.
558 */
559 cpr_set_substate(C_ST_DISABLE_UFS_LOGGING);
560 if (rc = cpr_ufs_logging(0))
561 return (rc);
562
563 /*
564 * Use sync_all to swap out all user pages and find out how much
565 * extra space needed for user pages that don't have back store
566 * space left.
567 */
568 CPR_STAT_EVENT_START(" swapout upages");
569 vfs_sync(SYNC_ALL);
570 CPR_STAT_EVENT_END(" swapout upages");
571
572 cpr_set_bitmap_size();
573
574 alloc_statefile:
575 /*
576 * If our last state was C_ST_DUMP_NOSPC, we're trying to
577 * realloc the statefile, otherwise this is the first attempt.
578 */
579 sf_realloc = (CPR->c_substate == C_ST_DUMP_NOSPC) ? 1 : 0;
580
581 CPR_STAT_EVENT_START(" alloc statefile");
582 cpr_set_substate(C_ST_STATEF_ALLOC);
583 if (rc = cpr_alloc_statefile(sf_realloc)) {
584 if (sf_realloc)
585 errp("realloc failed\n");
586 return (rc);
587 }
588 CPR_STAT_EVENT_END(" alloc statefile");
589
590 /*
591 * Sync the filesystem to preserve its integrity.
592 *
593 * This sync is also used to flush out all B_DELWRI buffers
594 * (fs cache) which are mapped and neither dirty nor referenced
595 * before cpr_invalidate_pages destroys them.
596 * fsflush does similar thing.
597 */
598 sync();
599
600 /*
601 * destroy all clean file mapped kernel pages
602 */
603 CPR_STAT_EVENT_START(" clean pages");
604 CPR_DEBUG(CPR_DEBUG1, ("cleaning up mapped pages..."));
605 (void) callb_execute_class(CB_CL_CPR_VM, CB_CODE_CPR_CHKPT);
606 CPR_DEBUG(CPR_DEBUG1, ("done\n"));
607 CPR_STAT_EVENT_END(" clean pages");
608 #endif
609
610
611 /*
612 * Hooks needed by lock manager prior to suspending.
613 * Refer to code for more comments.
614 */
615 PMD(PMD_SX, ("cpr_suspend: lock mgr\n"))
616 cpr_lock_mgr(lm_cprsuspend);
617
618 /*
619 * Now suspend all the devices
620 */
621 CPR_STAT_EVENT_START(" stop drivers");
622 CPR_DEBUG(CPR_DEBUG1, "suspending drivers...");
623 cpr_set_substate(C_ST_SUSPEND_DEVICES);
624 pm_powering_down = 1;
625 PMD(PMD_SX, ("cpr_suspend: suspending devices\n"))
626 rc = cpr_suspend_devices(ddi_root_node());
627 pm_powering_down = 0;
628 if (rc)
629 return (rc);
630 CPR_DEBUG(CPR_DEBUG1, "done\n");
631 CPR_STAT_EVENT_END(" stop drivers");
632
633 /*
634 * Stop all daemon activities
635 */
636 cpr_set_substate(C_ST_STOP_KERNEL_THREADS);
637 PMD(PMD_SX, ("cpr_suspend: stopping kernel threads\n"))
638 if (skt_rc = cpr_stop_kernel_threads())
639 return (skt_rc);
640
641 PMD(PMD_SX, ("cpr_suspend: POST KERNEL callback\n"))
642 (void) callb_execute_class(CB_CL_CPR_POST_KERNEL, CB_CODE_CPR_CHKPT);
643
644 PMD(PMD_SX, ("cpr_suspend: reattach noinvol fini\n"))
645 pm_reattach_noinvol_fini();
646
647 cpr_sae(1);
648
649 PMD(PMD_SX, ("cpr_suspend: CPR CALLOUT callback\n"))
650 (void) callb_execute_class(CB_CL_CPR_CALLOUT, CB_CODE_CPR_CHKPT);
651
652 if (sleeptype == CPR_TODISK) {
653 /*
654 * It's safer to do tod_get before we disable all intr.
655 */
656 CPR_STAT_EVENT_START(" write statefile");
657 }
658
659 /*
660 * it's time to ignore the outside world, stop the real time
661 * clock and disable any further intrpt activity.
662 */
663 PMD(PMD_SX, ("cpr_suspend: handle xc\n"))
664 i_cpr_handle_xc(1); /* turn it on to disable xc assertion */
665
666 mutex_enter(&cpu_lock);
667 PMD(PMD_SX, ("cpr_suspend: cyclic suspend\n"))
668 cyclic_suspend();
669 mutex_exit(&cpu_lock);
670
671 /*
672 * Due to the different methods of resuming the system between
673 * CPR_TODISK (boot cprboot on SPARC, which reloads kernel image)
674 * and CPR_TORAM (restart via reset into existing kernel image)
675 * cpus are not suspended and restored in the SPARC case, since it
676 * is necessary to restart the cpus and pause them before restoring
677 * the OBP image
678 */
679
680 #if defined(__x86)
681
682 /* pause aux cpus */
683 PMD(PMD_SX, ("pause aux cpus\n"))
684
685 cpr_set_substate(C_ST_MP_PAUSED);
686
687 if ((rc = cpr_suspend_cpus()) != 0)
688 return (rc);
689 #endif
690
691 PMD(PMD_SX, ("cpr_suspend: stop intr\n"))
692 i_cpr_stop_intr();
693 CPR_DEBUG(CPR_DEBUG1, "interrupt is stopped\n");
694
695 /*
696 * Since we will now disable the mechanism that causes prom_printfs
697 * to power up (if needed) the console fb/monitor, we assert that
698 * it must be up now.
699 */
700 ASSERT(pm_cfb_is_up());
701 PMD(PMD_SX, ("cpr_suspend: prom suspend prepost\n"))
702 prom_suspend_prepost();
703
704 #if defined(__sparc)
705 /*
706 * getting ready to write ourself out, flush the register
707 * windows to make sure that our stack is good when we
708 * come back on the resume side.
709 */
710 flush_windows();
711 #endif
712
713 /*
714 * For S3, we're done
715 */
716 if (sleeptype == CPR_TORAM) {
717 PMD(PMD_SX, ("cpr_suspend rets %x\n", rc))
718 cpr_set_substate(C_ST_NODUMP);
719 return (rc);
720 }
721 #if defined(__sparc)
722 /*
723 * FATAL: NO MORE MEMORY ALLOCATION ALLOWED AFTER THIS POINT!!!
724 *
725 * The system is quiesced at this point, we are ready to either dump
726 * to the state file for a extended sleep or a simple shutdown for
727 * systems with non-volatile memory.
728 */
729
730 /*
731 * special handling for reusable:
732 */
733 if (cpr_reusable_mode) {
734 cpr_set_substate(C_ST_SETPROPS_1);
735 if (nverr = cpr_set_properties(1))
736 return (nverr);
737 }
738
739 cpr_set_substate(C_ST_DUMP);
740 rc = cpr_dump(C_VP);
741
742 /*
743 * if any error occurred during dump, more
744 * special handling for reusable:
745 */
746 if (rc && cpr_reusable_mode) {
747 cpr_set_substate(C_ST_SETPROPS_0);
748 if (nverr = cpr_set_properties(0))
749 return (nverr);
750 }
751
752 if (rc == ENOSPC) {
753 cpr_set_substate(C_ST_DUMP_NOSPC);
754 (void) cpr_resume(sleeptype);
755 goto alloc_statefile;
756 } else if (rc == 0) {
757 if (cpr_reusable_mode) {
758 cpr_set_substate(C_ST_REUSABLE);
759 longjmp(&ttolwp(curthread)->lwp_qsav);
760 } else
761 rc = cpr_set_properties(1);
762 }
763 #endif
764 PMD(PMD_SX, ("cpr_suspend: return %d\n", rc))
765 return (rc);
766 }
767
768 void
cpr_resume_cpus(void)769 cpr_resume_cpus(void)
770 {
771 /*
772 * this is a cut down version of start_other_cpus()
773 * just do the initialization to wake the other cpus
774 */
775
776 #if defined(__x86)
777 /*
778 * Initialize our syscall handlers
779 */
780 init_cpu_syscall(CPU);
781
782 #endif
783
784 i_cpr_pre_resume_cpus();
785
786 /*
787 * Restart the paused cpus
788 */
789 mutex_enter(&cpu_lock);
790 start_cpus();
791 mutex_exit(&cpu_lock);
792
793 i_cpr_post_resume_cpus();
794
795 mutex_enter(&cpu_lock);
796 /*
797 * clear the affinity set in cpr_suspend_cpus()
798 */
799 affinity_clear();
800
801 /*
802 * offline all the cpus that were brought online during suspend
803 */
804 cpr_restore_offline();
805
806 mutex_exit(&cpu_lock);
807 }
808
809 void
cpr_unpause_cpus(void)810 cpr_unpause_cpus(void)
811 {
812 /*
813 * Now restore the system back to what it was before we suspended
814 */
815
816 PMD(PMD_SX, ("cpr_unpause_cpus: restoring system\n"))
817
818 mutex_enter(&cpu_lock);
819 /*
820 * Restart the paused cpus
821 */
822 start_cpus();
823
824 /*
825 * clear the affinity set in cpr_suspend_cpus()
826 */
827 affinity_clear();
828
829 /*
830 * offline all the cpus that were brought online during suspend
831 */
832 cpr_restore_offline();
833
834 mutex_exit(&cpu_lock);
835 }
836
837 /*
838 * Bring the system back up from a checkpoint, at this point
839 * the VM has been minimally restored by boot, the following
840 * are executed sequentially:
841 *
842 * - machdep setup and enable interrupts (mp startup if it's mp)
843 * - resume all devices
844 * - restart daemons
845 * - put all threads back on run queue
846 */
847 static int
cpr_resume(int sleeptype)848 cpr_resume(int sleeptype)
849 {
850 cpr_time_t pwron_tv, *ctp;
851 char *str;
852 int rc = 0;
853
854 /*
855 * The following switch is used to resume the system
856 * that was suspended to a different level.
857 */
858 CPR_DEBUG(CPR_DEBUG1, "\nEntering cpr_resume...\n");
859 PMD(PMD_SX, ("cpr_resume %x\n", sleeptype))
860
861 /*
862 * Note:
863 *
864 * The rollback labels rb_xyz do not represent the cpr resume
865 * state when event 'xyz' has happened. Instead they represent
866 * the state during cpr suspend when event 'xyz' was being
867 * entered (and where cpr suspend failed). The actual call that
868 * failed may also need to be partially rolled back, since they
869 * aren't atomic in most cases. In other words, rb_xyz means
870 * "roll back all cpr suspend events that happened before 'xyz',
871 * and the one that caused the failure, if necessary."
872 */
873 switch (CPR->c_substate) {
874 #if defined(__sparc)
875 case C_ST_DUMP:
876 /*
877 * This is most likely a full-fledged cpr_resume after
878 * a complete and successful cpr suspend. Just roll back
879 * everything.
880 */
881 ASSERT(sleeptype == CPR_TODISK);
882 break;
883
884 case C_ST_REUSABLE:
885 case C_ST_DUMP_NOSPC:
886 case C_ST_SETPROPS_0:
887 case C_ST_SETPROPS_1:
888 /*
889 * C_ST_REUSABLE and C_ST_DUMP_NOSPC are the only two
890 * special switch cases here. The other two do not have
891 * any state change during cpr_suspend() that needs to
892 * be rolled back. But these are exit points from
893 * cpr_suspend, so theoretically (or in the future), it
894 * is possible that a need for roll back of a state
895 * change arises between these exit points.
896 */
897 ASSERT(sleeptype == CPR_TODISK);
898 goto rb_dump;
899 #endif
900
901 case C_ST_NODUMP:
902 PMD(PMD_SX, ("cpr_resume: NODUMP\n"))
903 goto rb_nodump;
904
905 case C_ST_STOP_KERNEL_THREADS:
906 PMD(PMD_SX, ("cpr_resume: STOP_KERNEL_THREADS\n"))
907 goto rb_stop_kernel_threads;
908
909 case C_ST_SUSPEND_DEVICES:
910 PMD(PMD_SX, ("cpr_resume: SUSPEND_DEVICES\n"))
911 goto rb_suspend_devices;
912
913 #if defined(__sparc)
914 case C_ST_STATEF_ALLOC:
915 ASSERT(sleeptype == CPR_TODISK);
916 goto rb_statef_alloc;
917
918 case C_ST_DISABLE_UFS_LOGGING:
919 ASSERT(sleeptype == CPR_TODISK);
920 goto rb_disable_ufs_logging;
921 #endif
922
923 case C_ST_PM_REATTACH_NOINVOL:
924 PMD(PMD_SX, ("cpr_resume: REATTACH_NOINVOL\n"))
925 goto rb_pm_reattach_noinvol;
926
927 case C_ST_STOP_USER_THREADS:
928 PMD(PMD_SX, ("cpr_resume: STOP_USER_THREADS\n"))
929 goto rb_stop_user_threads;
930
931 #if defined(__sparc)
932 case C_ST_MP_OFFLINE:
933 PMD(PMD_SX, ("cpr_resume: MP_OFFLINE\n"))
934 goto rb_mp_offline;
935 #endif
936
937 #if defined(__x86)
938 case C_ST_MP_PAUSED:
939 PMD(PMD_SX, ("cpr_resume: MP_PAUSED\n"))
940 goto rb_mp_paused;
941 #endif
942
943
944 default:
945 PMD(PMD_SX, ("cpr_resume: others\n"))
946 goto rb_others;
947 }
948
949 rb_all:
950 /*
951 * perform platform-dependent initialization
952 */
953 if (cpr_suspend_succeeded)
954 i_cpr_machdep_setup();
955
956 /*
957 * system did not really go down if we jump here
958 */
959 rb_dump:
960 /*
961 * IMPORTANT: SENSITIVE RESUME SEQUENCE
962 *
963 * DO NOT ADD ANY INITIALIZATION STEP BEFORE THIS POINT!!
964 */
965 rb_nodump:
966 /*
967 * If we did suspend to RAM, we didn't generate a dump
968 */
969 PMD(PMD_SX, ("cpr_resume: CPR DMA callback\n"))
970 (void) callb_execute_class(CB_CL_CPR_DMA, CB_CODE_CPR_RESUME);
971 if (cpr_suspend_succeeded) {
972 PMD(PMD_SX, ("cpr_resume: CPR RPC callback\n"))
973 (void) callb_execute_class(CB_CL_CPR_RPC, CB_CODE_CPR_RESUME);
974 }
975
976 prom_resume_prepost();
977 #if !defined(__sparc)
978 /*
979 * Need to sync the software clock with the hardware clock.
980 * On Sparc, this occurs in the sparc-specific cbe. However
981 * on x86 this needs to be handled _before_ we bring other cpu's
982 * back online. So we call a resume function in timestamp.c
983 */
984 if (tsc_resume_in_cyclic == 0)
985 tsc_resume();
986
987 #endif
988
989 #if defined(__sparc)
990 if (cpr_suspend_succeeded && (boothowto & RB_DEBUG))
991 kdi_dvec_cpr_restart();
992 #endif
993
994
995 #if defined(__x86)
996 rb_mp_paused:
997 PT(PT_RMPO);
998 PMD(PMD_SX, ("resume aux cpus\n"))
999
1000 if (cpr_suspend_succeeded) {
1001 cpr_resume_cpus();
1002 } else {
1003 cpr_unpause_cpus();
1004 }
1005 #endif
1006
1007 /*
1008 * let the tmp callout catch up.
1009 */
1010 PMD(PMD_SX, ("cpr_resume: CPR CALLOUT callback\n"))
1011 (void) callb_execute_class(CB_CL_CPR_CALLOUT, CB_CODE_CPR_RESUME);
1012
1013 i_cpr_enable_intr();
1014
1015 mutex_enter(&cpu_lock);
1016 PMD(PMD_SX, ("cpr_resume: cyclic resume\n"))
1017 cyclic_resume();
1018 mutex_exit(&cpu_lock);
1019
1020 PMD(PMD_SX, ("cpr_resume: handle xc\n"))
1021 i_cpr_handle_xc(0); /* turn it off to allow xc assertion */
1022
1023 PMD(PMD_SX, ("cpr_resume: CPR POST KERNEL callback\n"))
1024 (void) callb_execute_class(CB_CL_CPR_POST_KERNEL, CB_CODE_CPR_RESUME);
1025
1026 /*
1027 * statistics gathering
1028 */
1029 if (cpr_suspend_succeeded) {
1030 /*
1031 * Prevent false alarm in tod_validate() due to tod
1032 * value change between suspend and resume
1033 */
1034 cpr_tod_status_set(TOD_CPR_RESUME_DONE);
1035
1036 cpr_convert_promtime(&pwron_tv);
1037
1038 ctp = &cpr_term.tm_shutdown;
1039 if (sleeptype == CPR_TODISK)
1040 CPR_STAT_EVENT_END_TMZ(" write statefile", ctp);
1041 CPR_STAT_EVENT_END_TMZ("Suspend Total", ctp);
1042
1043 CPR_STAT_EVENT_START_TMZ("Resume Total", &pwron_tv);
1044
1045 str = " prom time";
1046 CPR_STAT_EVENT_START_TMZ(str, &pwron_tv);
1047 ctp = &cpr_term.tm_cprboot_start;
1048 CPR_STAT_EVENT_END_TMZ(str, ctp);
1049
1050 str = " read statefile";
1051 CPR_STAT_EVENT_START_TMZ(str, ctp);
1052 ctp = &cpr_term.tm_cprboot_end;
1053 CPR_STAT_EVENT_END_TMZ(str, ctp);
1054 }
1055
1056 rb_stop_kernel_threads:
1057 /*
1058 * Put all threads back to where they belong; get the kernel
1059 * daemons straightened up too. Note that the callback table
1060 * locked during cpr_stop_kernel_threads() is released only
1061 * in cpr_start_kernel_threads(). Ensure modunloading is
1062 * disabled before starting kernel threads, we don't want
1063 * modunload thread to start changing device tree underneath.
1064 */
1065 PMD(PMD_SX, ("cpr_resume: modunload disable\n"))
1066 modunload_disable();
1067 PMD(PMD_SX, ("cpr_resume: start kernel threads\n"))
1068 cpr_start_kernel_threads();
1069
1070 rb_suspend_devices:
1071 CPR_DEBUG(CPR_DEBUG1, "resuming devices...");
1072 CPR_STAT_EVENT_START(" start drivers");
1073
1074 PMD(PMD_SX,
1075 ("cpr_resume: rb_suspend_devices: cpr_resume_uniproc = %d\n",
1076 cpr_resume_uniproc))
1077
1078 #if defined(__x86)
1079 /*
1080 * If cpr_resume_uniproc is set, then pause all the other cpus
1081 * apart from the current cpu, so that broken drivers that think
1082 * that they are on a uniprocessor machine will resume
1083 */
1084 if (cpr_resume_uniproc) {
1085 mutex_enter(&cpu_lock);
1086 pause_cpus(NULL, NULL);
1087 mutex_exit(&cpu_lock);
1088 }
1089 #endif
1090
1091 /*
1092 * The policy here is to continue resume everything we can if we did
1093 * not successfully finish suspend; and panic if we are coming back
1094 * from a fully suspended system.
1095 */
1096 PMD(PMD_SX, ("cpr_resume: resume devices\n"))
1097 rc = cpr_resume_devices(ddi_root_node(), 0);
1098
1099 cpr_sae(0);
1100
1101 str = "Failed to resume one or more devices.";
1102
1103 if (rc) {
1104 if (CPR->c_substate == C_ST_DUMP ||
1105 (sleeptype == CPR_TORAM &&
1106 CPR->c_substate == C_ST_NODUMP)) {
1107 if (cpr_test_point == FORCE_SUSPEND_TO_RAM) {
1108 PMD(PMD_SX, ("cpr_resume: resume device "
1109 "warn\n"))
1110 cpr_err(CE_WARN, str);
1111 } else {
1112 PMD(PMD_SX, ("cpr_resume: resume device "
1113 "panic\n"))
1114 cpr_err(CE_PANIC, str);
1115 }
1116 } else {
1117 PMD(PMD_SX, ("cpr_resume: resume device warn\n"))
1118 cpr_err(CE_WARN, str);
1119 }
1120 }
1121
1122 CPR_STAT_EVENT_END(" start drivers");
1123 CPR_DEBUG(CPR_DEBUG1, "done\n");
1124
1125 #if defined(__x86)
1126 /*
1127 * If cpr_resume_uniproc is set, then unpause all the processors
1128 * that were paused before resuming the drivers
1129 */
1130 if (cpr_resume_uniproc) {
1131 mutex_enter(&cpu_lock);
1132 start_cpus();
1133 mutex_exit(&cpu_lock);
1134 }
1135 #endif
1136
1137 /*
1138 * If we had disabled modunloading in this cpr resume cycle (i.e. we
1139 * resumed from a state earlier than C_ST_SUSPEND_DEVICES), re-enable
1140 * modunloading now.
1141 */
1142 if (CPR->c_substate != C_ST_SUSPEND_DEVICES) {
1143 PMD(PMD_SX, ("cpr_resume: modload enable\n"))
1144 modunload_enable();
1145 }
1146
1147 /*
1148 * Hooks needed by lock manager prior to resuming.
1149 * Refer to code for more comments.
1150 */
1151 PMD(PMD_SX, ("cpr_resume: lock mgr\n"))
1152 cpr_lock_mgr(lm_cprresume);
1153
1154 #if defined(__sparc)
1155 /*
1156 * This is a partial (half) resume during cpr suspend, we
1157 * haven't yet given up on the suspend. On return from here,
1158 * cpr_suspend() will try to reallocate and retry the suspend.
1159 */
1160 if (CPR->c_substate == C_ST_DUMP_NOSPC) {
1161 return (0);
1162 }
1163
1164 if (sleeptype == CPR_TODISK) {
1165 rb_statef_alloc:
1166 cpr_statef_close();
1167
1168 rb_disable_ufs_logging:
1169 /*
1170 * if ufs logging was disabled, re-enable
1171 */
1172 (void) cpr_ufs_logging(1);
1173 }
1174 #endif
1175
1176 rb_pm_reattach_noinvol:
1177 /*
1178 * When pm_reattach_noinvol() succeeds, modunload_thread will
1179 * remain disabled until after cpr suspend passes the
1180 * C_ST_STOP_KERNEL_THREADS state. If any failure happens before
1181 * cpr suspend reaches this state, we'll need to enable modunload
1182 * thread during rollback.
1183 */
1184 if (CPR->c_substate == C_ST_DISABLE_UFS_LOGGING ||
1185 CPR->c_substate == C_ST_STATEF_ALLOC ||
1186 CPR->c_substate == C_ST_SUSPEND_DEVICES ||
1187 CPR->c_substate == C_ST_STOP_KERNEL_THREADS) {
1188 PMD(PMD_SX, ("cpr_resume: reattach noinvol fini\n"))
1189 pm_reattach_noinvol_fini();
1190 }
1191
1192 PMD(PMD_SX, ("cpr_resume: CPR POST USER callback\n"))
1193 (void) callb_execute_class(CB_CL_CPR_POST_USER, CB_CODE_CPR_RESUME);
1194 PMD(PMD_SX, ("cpr_resume: CPR PROMPRINTF callback\n"))
1195 (void) callb_execute_class(CB_CL_CPR_PROMPRINTF, CB_CODE_CPR_RESUME);
1196
1197 PMD(PMD_SX, ("cpr_resume: restore direct levels\n"))
1198 pm_restore_direct_levels();
1199
1200 rb_stop_user_threads:
1201 CPR_DEBUG(CPR_DEBUG1, "starting user threads...");
1202 PMD(PMD_SX, ("cpr_resume: starting user threads\n"))
1203 cpr_start_user_threads();
1204 CPR_DEBUG(CPR_DEBUG1, "done\n");
1205 /*
1206 * Ask Xorg to resume the frame buffer, and wait for it to happen
1207 */
1208 mutex_enter(&srn_clone_lock);
1209 if (srn_signal) {
1210 PMD(PMD_SX, ("cpr_suspend: (*srn_signal)(..., "
1211 "SRN_NORMAL_RESUME)\n"))
1212 srn_inuse = 1; /* because (*srn_signal) cv_waits */
1213 (*srn_signal)(SRN_TYPE_APM, SRN_NORMAL_RESUME);
1214 srn_inuse = 0;
1215 } else {
1216 PMD(PMD_SX, ("cpr_suspend: srn_signal NULL\n"))
1217 }
1218 mutex_exit(&srn_clone_lock);
1219
1220 #if defined(__sparc)
1221 rb_mp_offline:
1222 if (cpr_mp_online())
1223 cpr_err(CE_WARN, "Failed to online all the processors.");
1224 #endif
1225
1226 rb_others:
1227 PMD(PMD_SX, ("cpr_resume: dep thread\n"))
1228 pm_dispatch_to_dep_thread(PM_DEP_WK_CPR_RESUME, NULL, NULL,
1229 PM_DEP_WAIT, NULL, 0);
1230
1231 PMD(PMD_SX, ("cpr_resume: CPR PM callback\n"))
1232 (void) callb_execute_class(CB_CL_CPR_PM, CB_CODE_CPR_RESUME);
1233
1234 if (cpr_suspend_succeeded) {
1235 cpr_stat_record_events();
1236 }
1237
1238 #if defined(__sparc)
1239 if (sleeptype == CPR_TODISK && !cpr_reusable_mode)
1240 cpr_clear_definfo();
1241 #endif
1242
1243 i_cpr_free_cpus();
1244 CPR_DEBUG(CPR_DEBUG1, "Sending SIGTHAW...");
1245 PMD(PMD_SX, ("cpr_resume: SIGTHAW\n"))
1246 cpr_signal_user(SIGTHAW);
1247 CPR_DEBUG(CPR_DEBUG1, "done\n");
1248
1249 CPR_STAT_EVENT_END("Resume Total");
1250
1251 CPR_STAT_EVENT_START_TMZ("WHOLE CYCLE", &wholecycle_tv);
1252 CPR_STAT_EVENT_END("WHOLE CYCLE");
1253
1254 if (cpr_debug & CPR_DEBUG1)
1255 cmn_err(CE_CONT, "\nThe system is back where you left!\n");
1256
1257 CPR_STAT_EVENT_START("POST CPR DELAY");
1258
1259 #ifdef CPR_STAT
1260 ctp = &cpr_term.tm_shutdown;
1261 CPR_STAT_EVENT_START_TMZ("PWROFF TIME", ctp);
1262 CPR_STAT_EVENT_END_TMZ("PWROFF TIME", &pwron_tv);
1263
1264 CPR_STAT_EVENT_PRINT();
1265 #endif /* CPR_STAT */
1266
1267 PMD(PMD_SX, ("cpr_resume returns %x\n", rc))
1268 return (rc);
1269 }
1270
1271 static void
cpr_suspend_init(int sleeptype)1272 cpr_suspend_init(int sleeptype)
1273 {
1274 cpr_time_t *ctp;
1275
1276 cpr_stat_init();
1277
1278 /*
1279 * If cpr_suspend() failed before cpr_dump() gets a chance
1280 * to reinitialize the terminator of the statefile,
1281 * the values of the old terminator will still linger around.
1282 * Since the terminator contains information that we need to
1283 * decide whether suspend succeeded or not, we need to
1284 * reinitialize it as early as possible.
1285 */
1286 cpr_term.real_statef_size = 0;
1287 ctp = &cpr_term.tm_shutdown;
1288 bzero(ctp, sizeof (*ctp));
1289 ctp = &cpr_term.tm_cprboot_start;
1290 bzero(ctp, sizeof (*ctp));
1291 ctp = &cpr_term.tm_cprboot_end;
1292 bzero(ctp, sizeof (*ctp));
1293
1294 if (sleeptype == CPR_TODISK) {
1295 /*
1296 * Lookup the physical address of our thread structure.
1297 * This should never be invalid and the entire thread structure
1298 * is expected to reside within the same pfn.
1299 */
1300 curthreadpfn = hat_getpfnum(kas.a_hat, (caddr_t)curthread);
1301 ASSERT(curthreadpfn != PFN_INVALID);
1302 ASSERT(curthreadpfn == hat_getpfnum(kas.a_hat,
1303 (caddr_t)curthread + sizeof (kthread_t) - 1));
1304 }
1305
1306 cpr_suspend_succeeded = 0;
1307 }
1308
1309 /*
1310 * bring all the offline cpus online
1311 */
1312 static int
cpr_all_online(void)1313 cpr_all_online(void)
1314 {
1315 int rc = 0;
1316
1317 #ifdef __sparc
1318 /*
1319 * do nothing
1320 */
1321 #else
1322
1323 cpu_t *cp;
1324
1325 ASSERT(MUTEX_HELD(&cpu_lock));
1326
1327 cp = cpu_list;
1328 do {
1329 cp->cpu_cpr_flags &= ~CPU_CPR_ONLINE;
1330 if (!CPU_ACTIVE(cp)) {
1331 if ((rc = cpu_online(cp, 0)) != 0)
1332 break;
1333 CPU_SET_CPR_FLAGS(cp, CPU_CPR_ONLINE);
1334 }
1335 } while ((cp = cp->cpu_next) != cpu_list);
1336
1337 if (rc) {
1338 /*
1339 * an online operation failed so offline the cpus
1340 * that were onlined above to restore the system
1341 * to its original state
1342 */
1343 cpr_restore_offline();
1344 }
1345 #endif
1346 return (rc);
1347 }
1348
1349 /*
1350 * offline all the cpus that were brought online by cpr_all_online()
1351 */
1352 static void
cpr_restore_offline(void)1353 cpr_restore_offline(void)
1354 {
1355
1356 #ifdef __sparc
1357 /*
1358 * do nothing
1359 */
1360 #else
1361
1362 cpu_t *cp;
1363 int rc = 0;
1364
1365 ASSERT(MUTEX_HELD(&cpu_lock));
1366
1367 cp = cpu_list;
1368 do {
1369 if (CPU_CPR_IS_ONLINE(cp)) {
1370 rc = cpu_offline(cp, 0);
1371 /*
1372 * this offline should work, since the cpu was
1373 * offline originally and was successfully onlined
1374 * by cpr_all_online()
1375 */
1376 ASSERT(rc == 0);
1377 cp->cpu_cpr_flags &= ~CPU_CPR_ONLINE;
1378 }
1379 } while ((cp = cp->cpu_next) != cpu_list);
1380
1381 #endif
1382
1383 }
1384