/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" /* * This module contains the guts of checkpoint-resume mechanism. * All code in this module is platform independent. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define PPM(dip) ((dev_info_t *)DEVI(dip)->devi_pm_ppm) extern struct cpr_terminator cpr_term; extern int cpr_alloc_statefile(int); extern void cpr_start_kernel_threads(void); extern void cpr_abbreviate_devpath(char *, char *); extern void cpr_convert_promtime(cpr_time_t *); extern void cpr_send_notice(void); extern void cpr_set_bitmap_size(void); extern void cpr_stat_init(); extern void cpr_statef_close(void); extern void flush_windows(void); extern void (*srn_signal)(int, int); extern void init_cpu_syscall(struct cpu *); extern void i_cpr_pre_resume_cpus(); extern void i_cpr_post_resume_cpus(); extern int pm_powering_down; extern kmutex_t srn_clone_lock; extern int srn_inuse; static int cpr_suspend(int); static int cpr_resume(int); static void cpr_suspend_init(int); #if defined(__x86) static int cpr_suspend_cpus(void); static void cpr_resume_cpus(void); #endif static int cpr_all_online(void); static void cpr_restore_offline(void); cpr_time_t wholecycle_tv; int cpr_suspend_succeeded; pfn_t curthreadpfn; int curthreadremapped; extern cpuset_t cpu_ready_set; extern void *(*cpu_pause_func)(void *); extern processorid_t i_cpr_bootcpuid(void); extern cpu_t *i_cpr_bootcpu(void); extern void tsc_adjust_delta(hrtime_t tdelta); extern void tsc_resume(void); extern int tsc_resume_in_cyclic; /* * Set this variable to 1, to have device drivers resume in an * uniprocessor environment. This is to allow drivers that assume * that they resume on a UP machine to continue to work. Should be * deprecated once the broken drivers are fixed */ int cpr_resume_uniproc = 0; /* * save or restore abort_enable; this prevents a drop * to kadb or prom during cpr_resume_devices() when * there is no kbd present; see abort_sequence_enter() */ static void cpr_sae(int stash) { static int saved_ae = -1; if (stash) { saved_ae = abort_enable; abort_enable = 0; } else if (saved_ae != -1) { abort_enable = saved_ae; saved_ae = -1; } } /* * The main switching point for cpr, this routine starts the ckpt * and state file saving routines; on resume the control is * returned back to here and it then calls the resume routine. */ int cpr_main(int sleeptype) { int rc, rc2; label_t saveq; klwp_t *tlwp = ttolwp(curthread); if (sleeptype == CPR_TODISK) { if ((rc = cpr_default_setup(1)) != 0) return (rc); ASSERT(tlwp); saveq = tlwp->lwp_qsav; } if (sleeptype == CPR_TORAM) { rc = cpr_suspend(sleeptype); PMD(PMD_SX, ("cpr_suspend rets %x\n", rc)) if (rc == 0) { int i_cpr_power_down(int sleeptype); /* * From this point on, we should be at a high * spl, interrupts disabled, and all but one * cpu's paused (effectively UP/single threaded). * So this is were we want to put ASSERTS() * to let us know otherwise. */ ASSERT(cpus_paused()); /* * Now do the work of actually putting this * machine to sleep! */ rc = i_cpr_power_down(sleeptype); if (rc == 0) { PMD(PMD_SX, ("back from succssful suspend\n")) } /* * We do care about the return value from cpr_resume * at this point, as it will tell us if one of the * resume functions failed (cpr_resume_devices()) * However, for this to return and _not_ panic, means * that we must be in one of the test functions. So * check for that and return an appropriate message. */ rc2 = cpr_resume(sleeptype); if (rc2 != 0) { ASSERT(cpr_test_point > 0); cmn_err(CE_NOTE, "cpr_resume returned non-zero: %d\n", rc2); PMD(PMD_SX, ("cpr_resume rets %x\n", rc2)) } ASSERT(!cpus_paused()); } else { PMD(PMD_SX, ("failed suspend, resuming\n")) rc = cpr_resume(sleeptype); } return (rc); } /* * Remember where we are for resume after reboot */ if (!setjmp(&tlwp->lwp_qsav)) { /* * try to checkpoint the system, if failed return back * to userland, otherwise power off. */ rc = cpr_suspend(sleeptype); if (rc || cpr_reusable_mode) { /* * We don't really want to go down, or * something went wrong in suspend, do what we can * to put the system back to an operable state then * return back to userland. */ PMD(PMD_SX, ("failed suspend, resuming\n")) (void) cpr_resume(sleeptype); PMD(PMD_SX, ("back from failed suspend resume\n")) } } else { /* * This is the resumed side of longjmp, restore the previous * longjmp pointer if there is one so this will be transparent * to the world. * This path is only for CPR_TODISK, where we reboot */ ASSERT(sleeptype == CPR_TODISK); tlwp->lwp_qsav = saveq; CPR->c_flags &= ~C_SUSPENDING; CPR->c_flags |= C_RESUMING; /* * resume the system back to the original state */ rc = cpr_resume(sleeptype); PMD(PMD_SX, ("back from successful suspend; resume rets %x\n", rc)) } (void) cpr_default_setup(0); return (rc); } #if defined(__sparc) /* * check/disable or re-enable UFS logging */ static void cpr_log_status(int enable, int *svstat, vnode_t *vp) { int cmd, status, error; char *str, *able; fiolog_t fl; refstr_t *mntpt; str = "cpr_log_status"; bzero(&fl, sizeof (fl)); fl.error = FIOLOG_ENONE; /* * when disabling, first get and save logging status (0 or 1) */ if (enable == 0) { if (error = VOP_IOCTL(vp, _FIOISLOG, (uintptr_t)&status, FKIOCTL, CRED(), NULL)) { mntpt = vfs_getmntpoint(vp->v_vfsp); prom_printf("%s: \"%s\", cant get logging " "status, error %d\n", str, refstr_value(mntpt), error); refstr_rele(mntpt); return; } *svstat = status; if (cpr_debug & CPR_DEBUG5) { mntpt = vfs_getmntpoint(vp->v_vfsp); errp("%s: \"%s\", logging status = %d\n", str, refstr_value(mntpt), status); refstr_rele(mntpt); }; able = "disable"; cmd = _FIOLOGDISABLE; } else { able = "enable"; cmd = _FIOLOGENABLE; } /* * disable or re-enable logging when the saved status is 1 */ if (*svstat == 1) { error = VOP_IOCTL(vp, cmd, (uintptr_t)&fl, FKIOCTL, CRED(), NULL); if (error) { mntpt = vfs_getmntpoint(vp->v_vfsp); prom_printf("%s: \"%s\", cant %s logging, error %d\n", str, refstr_value(mntpt), able, error); refstr_rele(mntpt); } else { if (cpr_debug & CPR_DEBUG5) { mntpt = vfs_getmntpoint(vp->v_vfsp); errp("%s: \"%s\", logging is now %sd\n", str, refstr_value(mntpt), able); refstr_rele(mntpt); }; } } /* * when enabling logging, reset the saved status * to unknown for next time */ if (enable) *svstat = -1; } /* * enable/disable UFS logging on filesystems containing cpr_default_path * and cpr statefile. since the statefile can be on any fs, that fs * needs to be handled separately. this routine and cprboot expect that * CPR_CONFIG and CPR_DEFAULT both reside on the same fs, rootfs. cprboot * is loaded from the device with rootfs and uses the same device to open * both CPR_CONFIG and CPR_DEFAULT (see common/support.c). moving either * file outside of rootfs would cause errors during cprboot, plus cpr and * fsck problems with the new fs if logging were enabled. */ static int cpr_ufs_logging(int enable) { static int def_status = -1, sf_status = -1; struct vfs *vfsp; char *fname; vnode_t *vp; int error; if (cpr_reusable_mode) return (0); if (error = cpr_open_deffile(FREAD, &vp)) return (error); cpr_log_status(enable, &def_status, vp); vfsp = vp->v_vfsp; (void) VOP_CLOSE(vp, FREAD, 1, (offset_t)0, CRED()); VN_RELE(vp); fname = cpr_build_statefile_path(); if (fname == NULL) return (ENOENT); if (error = vn_open(fname, UIO_SYSSPACE, FCREAT|FWRITE, 0600, &vp, CRCREAT, 0)) { prom_printf("cpr_ufs_logging: cant open/create \"%s\", " "error %d\n", fname, error); return (error); } /* * check logging status for the statefile if it resides * on a different fs and the type is a regular file */ if (vp->v_vfsp != vfsp && vp->v_type == VREG) cpr_log_status(enable, &sf_status, vp); (void) VOP_CLOSE(vp, FWRITE, 1, (offset_t)0, CRED()); VN_RELE(vp); return (0); } #endif /* * Check if klmmod is loaded and call a lock manager service; if klmmod * is not loaded, the services aren't needed and a call would trigger a * modload, which would block since another thread would never run. */ static void cpr_lock_mgr(void (*service)(void)) { if (mod_find_by_filename(NULL, "misc/klmmod") != NULL) (*service)(); } int cpr_suspend_cpus(void) { cpu_t *bootcpu; int ret = 0; extern void *i_cpr_save_context(void *arg); mutex_enter(&cpu_lock); /* * if bootcpu is offline bring it back online */ bootcpu = i_cpr_bootcpu(); /* * the machine could not have booted without a bootcpu */ ASSERT(bootcpu != NULL); /* * bring all the offline cpus online */ if ((ret = cpr_all_online())) { mutex_exit(&cpu_lock); return (ret); } /* * Set the affinity to be the boot processor * This is cleared in either cpr_resume_cpus() or cpr_unpause_cpus() */ affinity_set(i_cpr_bootcpuid()); ASSERT(CPU->cpu_id == 0); PMD(PMD_SX, ("curthread running on bootcpu\n")) /* * pause all other running CPUs and save the CPU state at the sametime */ cpu_pause_func = i_cpr_save_context; pause_cpus(NULL); mutex_exit(&cpu_lock); return (0); } /* * Take the system down to a checkpointable state and write * the state file, the following are sequentially executed: * * - Request all user threads to stop themselves * - push out and invalidate user pages * - bring statefile inode incore to prevent a miss later * - request all daemons to stop * - check and make sure all threads are stopped * - sync the file system * - suspend all devices * - block intrpts * - dump system state and memory to state file * - SPARC code will not be called with CPR_TORAM, caller filters */ static int cpr_suspend(int sleeptype) { #if defined(__sparc) int sf_realloc, nverr; #endif int rc = 0; int skt_rc = 0; PMD(PMD_SX, ("cpr_suspend %x\n", sleeptype)) cpr_set_substate(C_ST_SUSPEND_BEGIN); cpr_suspend_init(sleeptype); cpr_save_time(); cpr_tod_get(&wholecycle_tv); CPR_STAT_EVENT_START("Suspend Total"); i_cpr_alloc_cpus(); #if defined(__sparc) ASSERT(sleeptype == CPR_TODISK); if (!cpr_reusable_mode) { /* * We need to validate default file before fs * functionality is disabled. */ if (rc = cpr_validate_definfo(0)) return (rc); } i_cpr_save_machdep_info(); #endif PMD(PMD_SX, ("cpr_suspend: stop scans\n")) /* Stop PM scans ASAP */ (void) callb_execute_class(CB_CL_CPR_PM, CB_CODE_CPR_CHKPT); pm_dispatch_to_dep_thread(PM_DEP_WK_CPR_SUSPEND, NULL, NULL, PM_DEP_WAIT, NULL, 0); #if defined(__sparc) ASSERT(sleeptype == CPR_TODISK); cpr_set_substate(C_ST_MP_OFFLINE); if (rc = cpr_mp_offline()) return (rc); #endif /* * Ask Xorg to suspend the frame buffer, and wait for it to happen */ mutex_enter(&srn_clone_lock); if (srn_signal) { PMD(PMD_SX, ("cpr_suspend: (*srn_signal)(..., " "SRN_SUSPEND_REQ)\n")) srn_inuse = 1; /* because *(srn_signal) cv_waits */ (*srn_signal)(SRN_TYPE_APM, SRN_SUSPEND_REQ); srn_inuse = 0; } else { PMD(PMD_SX, ("cpr_suspend: srn_signal NULL\n")) } mutex_exit(&srn_clone_lock); /* * Ask the user threads to stop by themselves, but * if they don't or can't after 3 retries, we give up on CPR. * The 3 retry is not a random number because 2 is possible if * a thread has been forked before the parent thread is stopped. */ CPR_DEBUG(CPR_DEBUG1, "\nstopping user threads..."); CPR_STAT_EVENT_START(" stop users"); cpr_set_substate(C_ST_STOP_USER_THREADS); PMD(PMD_SX, ("cpr_suspend: stop user threads\n")) if (rc = cpr_stop_user_threads()) return (rc); CPR_STAT_EVENT_END(" stop users"); CPR_DEBUG(CPR_DEBUG1, "done\n"); PMD(PMD_SX, ("cpr_suspend: save direct levels\n")) pm_save_direct_levels(); /* * User threads are stopped. We will start communicating with the * user via prom_printf (some debug output may have already happened) * so let anybody who cares know about this (bug 4096122) */ (void) callb_execute_class(CB_CL_CPR_PROMPRINTF, CB_CODE_CPR_CHKPT); PMD(PMD_SX, ("cpr_suspend: send notice\n")) #ifndef DEBUG cpr_send_notice(); if (cpr_debug) prom_printf("\n"); #endif PMD(PMD_SX, ("cpr_suspend: POST USER callback\n")) (void) callb_execute_class(CB_CL_CPR_POST_USER, CB_CODE_CPR_CHKPT); /* * Reattach any drivers which originally exported the * no-involuntary-power-cycles property. We need to do this before * stopping kernel threads because modload is implemented using * a kernel thread. */ cpr_set_substate(C_ST_PM_REATTACH_NOINVOL); PMD(PMD_SX, ("cpr_suspend: reattach noinvol\n")) if (!pm_reattach_noinvol()) return (ENXIO); #if defined(__sparc) ASSERT(sleeptype == CPR_TODISK); /* * if ufs logging is enabled, we need to disable before * stopping kernel threads so that ufs delete and roll * threads can do the work. */ cpr_set_substate(C_ST_DISABLE_UFS_LOGGING); if (rc = cpr_ufs_logging(0)) return (rc); /* * Use sync_all to swap out all user pages and find out how much * extra space needed for user pages that don't have back store * space left. */ CPR_STAT_EVENT_START(" swapout upages"); vfs_sync(SYNC_ALL); CPR_STAT_EVENT_END(" swapout upages"); cpr_set_bitmap_size(); alloc_statefile: /* * If our last state was C_ST_DUMP_NOSPC, we're trying to * realloc the statefile, otherwise this is the first attempt. */ sf_realloc = (CPR->c_substate == C_ST_DUMP_NOSPC) ? 1 : 0; CPR_STAT_EVENT_START(" alloc statefile"); cpr_set_substate(C_ST_STATEF_ALLOC); if (rc = cpr_alloc_statefile(sf_realloc)) { if (sf_realloc) errp("realloc failed\n"); return (rc); } CPR_STAT_EVENT_END(" alloc statefile"); /* * Sync the filesystem to preserve its integrity. * * This sync is also used to flush out all B_DELWRI buffers * (fs cache) which are mapped and neither dirty nor referenced * before cpr_invalidate_pages destroys them. * fsflush does similar thing. */ sync(); /* * destroy all clean file mapped kernel pages */ CPR_STAT_EVENT_START(" clean pages"); CPR_DEBUG(CPR_DEBUG1, ("cleaning up mapped pages...")); (void) callb_execute_class(CB_CL_CPR_VM, CB_CODE_CPR_CHKPT); CPR_DEBUG(CPR_DEBUG1, ("done\n")); CPR_STAT_EVENT_END(" clean pages"); #endif /* * Hooks needed by lock manager prior to suspending. * Refer to code for more comments. */ PMD(PMD_SX, ("cpr_suspend: lock mgr\n")) cpr_lock_mgr(lm_cprsuspend); /* * Now suspend all the devices */ CPR_STAT_EVENT_START(" stop drivers"); CPR_DEBUG(CPR_DEBUG1, "suspending drivers..."); cpr_set_substate(C_ST_SUSPEND_DEVICES); pm_powering_down = 1; PMD(PMD_SX, ("cpr_suspend: suspending devices\n")) rc = cpr_suspend_devices(ddi_root_node()); pm_powering_down = 0; if (rc) return (rc); CPR_DEBUG(CPR_DEBUG1, "done\n"); CPR_STAT_EVENT_END(" stop drivers"); /* * Stop all daemon activities */ cpr_set_substate(C_ST_STOP_KERNEL_THREADS); PMD(PMD_SX, ("cpr_suspend: stopping kernel threads\n")) if (skt_rc = cpr_stop_kernel_threads()) return (skt_rc); PMD(PMD_SX, ("cpr_suspend: POST KERNEL callback\n")) (void) callb_execute_class(CB_CL_CPR_POST_KERNEL, CB_CODE_CPR_CHKPT); PMD(PMD_SX, ("cpr_suspend: reattach noinvol fini\n")) pm_reattach_noinvol_fini(); cpr_sae(1); PMD(PMD_SX, ("cpr_suspend: CPR CALLOUT callback\n")) (void) callb_execute_class(CB_CL_CPR_CALLOUT, CB_CODE_CPR_CHKPT); if (sleeptype == CPR_TODISK) { /* * It's safer to do tod_get before we disable all intr. */ CPR_STAT_EVENT_START(" write statefile"); } /* * it's time to ignore the outside world, stop the real time * clock and disable any further intrpt activity. */ PMD(PMD_SX, ("cpr_suspend: handle xc\n")) i_cpr_handle_xc(1); /* turn it on to disable xc assertion */ mutex_enter(&cpu_lock); PMD(PMD_SX, ("cpr_suspend: cyclic suspend\n")) cyclic_suspend(); mutex_exit(&cpu_lock); /* * Due to the different methods of resuming the system between * CPR_TODISK (boot cprboot on SPARC, which reloads kernel image) * and CPR_TORAM (restart via reset into existing kernel image) * cpus are not suspended and restored in the SPARC case, since it * is necessary to restart the cpus and pause them before restoring * the OBP image */ #if defined(__x86) /* pause aux cpus */ PMD(PMD_SX, ("pause aux cpus\n")) cpr_set_substate(C_ST_MP_PAUSED); if ((rc = cpr_suspend_cpus()) != 0) return (rc); #endif PMD(PMD_SX, ("cpr_suspend: stop intr\n")) i_cpr_stop_intr(); CPR_DEBUG(CPR_DEBUG1, "interrupt is stopped\n"); /* * Since we will now disable the mechanism that causes prom_printfs * to power up (if needed) the console fb/monitor, we assert that * it must be up now. */ ASSERT(pm_cfb_is_up()); PMD(PMD_SX, ("cpr_suspend: prom suspend prepost\n")) prom_suspend_prepost(); #if defined(__sparc) /* * getting ready to write ourself out, flush the register * windows to make sure that our stack is good when we * come back on the resume side. */ flush_windows(); #endif /* * For S3, we're done */ if (sleeptype == CPR_TORAM) { PMD(PMD_SX, ("cpr_suspend rets %x\n", rc)) cpr_set_substate(C_ST_NODUMP); return (rc); } #if defined(__sparc) /* * FATAL: NO MORE MEMORY ALLOCATION ALLOWED AFTER THIS POINT!!! * * The system is quiesced at this point, we are ready to either dump * to the state file for a extended sleep or a simple shutdown for * systems with non-volatile memory. */ /* * special handling for reusable: */ if (cpr_reusable_mode) { cpr_set_substate(C_ST_SETPROPS_1); if (nverr = cpr_set_properties(1)) return (nverr); } cpr_set_substate(C_ST_DUMP); rc = cpr_dump(C_VP); /* * if any error occured during dump, more * special handling for reusable: */ if (rc && cpr_reusable_mode) { cpr_set_substate(C_ST_SETPROPS_0); if (nverr = cpr_set_properties(0)) return (nverr); } if (rc == ENOSPC) { cpr_set_substate(C_ST_DUMP_NOSPC); (void) cpr_resume(sleeptype); goto alloc_statefile; } else if (rc == 0) { if (cpr_reusable_mode) { cpr_set_substate(C_ST_REUSABLE); longjmp(&ttolwp(curthread)->lwp_qsav); } else rc = cpr_set_properties(1); } #endif PMD(PMD_SX, ("cpr_suspend: return %d\n", rc)) return (rc); } void cpr_resume_cpus(void) { /* * this is a cut down version of start_other_cpus() * just do the initialization to wake the other cpus */ #if defined(__x86) /* * Initialize our syscall handlers */ init_cpu_syscall(CPU); #endif i_cpr_pre_resume_cpus(); /* * Restart the paused cpus */ mutex_enter(&cpu_lock); start_cpus(); mutex_exit(&cpu_lock); /* * clear the affinity set in cpr_suspend_cpus() */ affinity_clear(); i_cpr_post_resume_cpus(); mutex_enter(&cpu_lock); /* * Restore this cpu to use the regular cpu_pause(), so that * online and offline will work correctly */ cpu_pause_func = NULL; /* * offline all the cpus that were brought online during suspend */ cpr_restore_offline(); /* * clear the affinity set in cpr_suspend_cpus() */ affinity_clear(); mutex_exit(&cpu_lock); } void cpr_unpause_cpus(void) { /* * Now restore the system back to what it was before we suspended */ PMD(PMD_SX, ("cpr_unpause_cpus: restoring system\n")) mutex_enter(&cpu_lock); /* * Restore this cpu to use the regular cpu_pause(), so that * online and offline will work correctly */ cpu_pause_func = NULL; /* * Restart the paused cpus */ start_cpus(); /* * offline all the cpus that were brought online during suspend */ cpr_restore_offline(); /* * clear the affinity set in cpr_suspend_cpus() */ affinity_clear(); mutex_exit(&cpu_lock); } /* * Bring the system back up from a checkpoint, at this point * the VM has been minimally restored by boot, the following * are executed sequentially: * * - machdep setup and enable interrupts (mp startup if it's mp) * - resume all devices * - restart daemons * - put all threads back on run queue */ static int cpr_resume(int sleeptype) { cpr_time_t pwron_tv, *ctp; char *str; int rc = 0; /* * The following switch is used to resume the system * that was suspended to a different level. */ CPR_DEBUG(CPR_DEBUG1, "\nEntering cpr_resume...\n"); PMD(PMD_SX, ("cpr_resume %x\n", sleeptype)) /* * Note: * * The rollback labels rb_xyz do not represent the cpr resume * state when event 'xyz' has happened. Instead they represent * the state during cpr suspend when event 'xyz' was being * entered (and where cpr suspend failed). The actual call that * failed may also need to be partially rolled back, since they * aren't atomic in most cases. In other words, rb_xyz means * "roll back all cpr suspend events that happened before 'xyz', * and the one that caused the failure, if necessary." */ switch (CPR->c_substate) { #if defined(__sparc) case C_ST_DUMP: /* * This is most likely a full-fledged cpr_resume after * a complete and successful cpr suspend. Just roll back * everything. */ ASSERT(sleeptype == CPR_TODISK); break; case C_ST_REUSABLE: case C_ST_DUMP_NOSPC: case C_ST_SETPROPS_0: case C_ST_SETPROPS_1: /* * C_ST_REUSABLE and C_ST_DUMP_NOSPC are the only two * special switch cases here. The other two do not have * any state change during cpr_suspend() that needs to * be rolled back. But these are exit points from * cpr_suspend, so theoretically (or in the future), it * is possible that a need for roll back of a state * change arises between these exit points. */ ASSERT(sleeptype == CPR_TODISK); goto rb_dump; #endif case C_ST_NODUMP: PMD(PMD_SX, ("cpr_resume: NODUMP\n")) goto rb_nodump; case C_ST_STOP_KERNEL_THREADS: PMD(PMD_SX, ("cpr_resume: STOP_KERNEL_THREADS\n")) goto rb_stop_kernel_threads; case C_ST_SUSPEND_DEVICES: PMD(PMD_SX, ("cpr_resume: SUSPEND_DEVICES\n")) goto rb_suspend_devices; #if defined(__sparc) case C_ST_STATEF_ALLOC: ASSERT(sleeptype == CPR_TODISK); goto rb_statef_alloc; case C_ST_DISABLE_UFS_LOGGING: ASSERT(sleeptype == CPR_TODISK); goto rb_disable_ufs_logging; #endif case C_ST_PM_REATTACH_NOINVOL: PMD(PMD_SX, ("cpr_resume: REATTACH_NOINVOL\n")) goto rb_pm_reattach_noinvol; case C_ST_STOP_USER_THREADS: PMD(PMD_SX, ("cpr_resume: STOP_USER_THREADS\n")) goto rb_stop_user_threads; #if defined(__sparc) case C_ST_MP_OFFLINE: PMD(PMD_SX, ("cpr_resume: MP_OFFLINE\n")) goto rb_mp_offline; #endif #if defined(__x86) case C_ST_MP_PAUSED: PMD(PMD_SX, ("cpr_resume: MP_PAUSED\n")) goto rb_mp_paused; #endif default: PMD(PMD_SX, ("cpr_resume: others\n")) goto rb_others; } rb_all: /* * perform platform-dependent initialization */ if (cpr_suspend_succeeded) i_cpr_machdep_setup(); /* * system did not really go down if we jump here */ rb_dump: /* * IMPORTANT: SENSITIVE RESUME SEQUENCE * * DO NOT ADD ANY INITIALIZATION STEP BEFORE THIS POINT!! */ rb_nodump: /* * If we did suspend to RAM, we didn't generate a dump */ PMD(PMD_SX, ("cpr_resume: CPR DMA callback\n")) (void) callb_execute_class(CB_CL_CPR_DMA, CB_CODE_CPR_RESUME); if (cpr_suspend_succeeded) { PMD(PMD_SX, ("cpr_resume: CPR RPC callback\n")) (void) callb_execute_class(CB_CL_CPR_RPC, CB_CODE_CPR_RESUME); } prom_resume_prepost(); #if !defined(__sparc) /* * Need to sync the software clock with the hardware clock. * On Sparc, this occurs in the sparc-specific cbe. However * on x86 this needs to be handled _before_ we bring other cpu's * back online. So we call a resume function in timestamp.c */ if (tsc_resume_in_cyclic == 0) tsc_resume(); #endif #if defined(__sparc) if (cpr_suspend_succeeded && (boothowto & RB_DEBUG)) kdi_dvec_cpr_restart(); #endif #if defined(__x86) rb_mp_paused: PT(PT_RMPO); PMD(PMD_SX, ("resume aux cpus\n")) if (cpr_suspend_succeeded) { cpr_resume_cpus(); } else { cpr_unpause_cpus(); } #endif /* * let the tmp callout catch up. */ PMD(PMD_SX, ("cpr_resume: CPR CALLOUT callback\n")) (void) callb_execute_class(CB_CL_CPR_CALLOUT, CB_CODE_CPR_RESUME); i_cpr_enable_intr(); mutex_enter(&cpu_lock); PMD(PMD_SX, ("cpr_resume: cyclic resume\n")) cyclic_resume(); mutex_exit(&cpu_lock); PMD(PMD_SX, ("cpr_resume: handle xc\n")) i_cpr_handle_xc(0); /* turn it off to allow xc assertion */ PMD(PMD_SX, ("cpr_resume: CPR POST KERNEL callback\n")) (void) callb_execute_class(CB_CL_CPR_POST_KERNEL, CB_CODE_CPR_RESUME); /* * statistics gathering */ if (cpr_suspend_succeeded) { /* * Prevent false alarm in tod_validate() due to tod * value change between suspend and resume */ cpr_tod_fault_reset(); cpr_convert_promtime(&pwron_tv); ctp = &cpr_term.tm_shutdown; if (sleeptype == CPR_TODISK) CPR_STAT_EVENT_END_TMZ(" write statefile", ctp); CPR_STAT_EVENT_END_TMZ("Suspend Total", ctp); CPR_STAT_EVENT_START_TMZ("Resume Total", &pwron_tv); str = " prom time"; CPR_STAT_EVENT_START_TMZ(str, &pwron_tv); ctp = &cpr_term.tm_cprboot_start; CPR_STAT_EVENT_END_TMZ(str, ctp); str = " read statefile"; CPR_STAT_EVENT_START_TMZ(str, ctp); ctp = &cpr_term.tm_cprboot_end; CPR_STAT_EVENT_END_TMZ(str, ctp); } rb_stop_kernel_threads: /* * Put all threads back to where they belong; get the kernel * daemons straightened up too. Note that the callback table * locked during cpr_stop_kernel_threads() is released only * in cpr_start_kernel_threads(). Ensure modunloading is * disabled before starting kernel threads, we don't want * modunload thread to start changing device tree underneath. */ PMD(PMD_SX, ("cpr_resume: modunload disable\n")) modunload_disable(); PMD(PMD_SX, ("cpr_resume: start kernel threads\n")) cpr_start_kernel_threads(); rb_suspend_devices: CPR_DEBUG(CPR_DEBUG1, "resuming devices..."); CPR_STAT_EVENT_START(" start drivers"); PMD(PMD_SX, ("cpr_resume: rb_suspend_devices: cpr_resume_uniproc = %d\n", cpr_resume_uniproc)) #if defined(__x86) /* * If cpr_resume_uniproc is set, then pause all the other cpus * apart from the current cpu, so that broken drivers that think * that they are on a uniprocessor machine will resume */ if (cpr_resume_uniproc) { mutex_enter(&cpu_lock); pause_cpus(NULL); mutex_exit(&cpu_lock); } #endif /* * The policy here is to continue resume everything we can if we did * not successfully finish suspend; and panic if we are coming back * from a fully suspended system. */ PMD(PMD_SX, ("cpr_resume: resume devices\n")) rc = cpr_resume_devices(ddi_root_node(), 0); cpr_sae(0); str = "Failed to resume one or more devices."; if (rc) { if (CPR->c_substate == C_ST_DUMP || (sleeptype == CPR_TORAM && CPR->c_substate == C_ST_NODUMP)) { if (cpr_test_point == FORCE_SUSPEND_TO_RAM) { PMD(PMD_SX, ("cpr_resume: resume device " "warn\n")) cpr_err(CE_WARN, str); } else { PMD(PMD_SX, ("cpr_resume: resume device " "panic\n")) cpr_err(CE_PANIC, str); } } else { PMD(PMD_SX, ("cpr_resume: resume device warn\n")) cpr_err(CE_WARN, str); } } CPR_STAT_EVENT_END(" start drivers"); CPR_DEBUG(CPR_DEBUG1, "done\n"); #if defined(__x86) /* * If cpr_resume_uniproc is set, then unpause all the processors * that were paused before resuming the drivers */ if (cpr_resume_uniproc) { mutex_enter(&cpu_lock); start_cpus(); mutex_exit(&cpu_lock); } #endif /* * If we had disabled modunloading in this cpr resume cycle (i.e. we * resumed from a state earlier than C_ST_SUSPEND_DEVICES), re-enable * modunloading now. */ if (CPR->c_substate != C_ST_SUSPEND_DEVICES) { PMD(PMD_SX, ("cpr_resume: modload enable\n")) modunload_enable(); } /* * Hooks needed by lock manager prior to resuming. * Refer to code for more comments. */ PMD(PMD_SX, ("cpr_resume: lock mgr\n")) cpr_lock_mgr(lm_cprresume); #if defined(__sparc) /* * This is a partial (half) resume during cpr suspend, we * haven't yet given up on the suspend. On return from here, * cpr_suspend() will try to reallocate and retry the suspend. */ if (CPR->c_substate == C_ST_DUMP_NOSPC) { return (0); } if (sleeptype == CPR_TODISK) { rb_statef_alloc: cpr_statef_close(); rb_disable_ufs_logging: /* * if ufs logging was disabled, re-enable */ (void) cpr_ufs_logging(1); } #endif rb_pm_reattach_noinvol: /* * When pm_reattach_noinvol() succeeds, modunload_thread will * remain disabled until after cpr suspend passes the * C_ST_STOP_KERNEL_THREADS state. If any failure happens before * cpr suspend reaches this state, we'll need to enable modunload * thread during rollback. */ if (CPR->c_substate == C_ST_DISABLE_UFS_LOGGING || CPR->c_substate == C_ST_STATEF_ALLOC || CPR->c_substate == C_ST_SUSPEND_DEVICES || CPR->c_substate == C_ST_STOP_KERNEL_THREADS) { PMD(PMD_SX, ("cpr_resume: reattach noinvol fini\n")) pm_reattach_noinvol_fini(); } PMD(PMD_SX, ("cpr_resume: CPR POST USER callback\n")) (void) callb_execute_class(CB_CL_CPR_POST_USER, CB_CODE_CPR_RESUME); PMD(PMD_SX, ("cpr_resume: CPR PROMPRINTF callback\n")) (void) callb_execute_class(CB_CL_CPR_PROMPRINTF, CB_CODE_CPR_RESUME); PMD(PMD_SX, ("cpr_resume: restore direct levels\n")) pm_restore_direct_levels(); rb_stop_user_threads: CPR_DEBUG(CPR_DEBUG1, "starting user threads..."); PMD(PMD_SX, ("cpr_resume: starting user threads\n")) cpr_start_user_threads(); CPR_DEBUG(CPR_DEBUG1, "done\n"); /* * Ask Xorg to resume the frame buffer, and wait for it to happen */ mutex_enter(&srn_clone_lock); if (srn_signal) { PMD(PMD_SX, ("cpr_suspend: (*srn_signal)(..., " "SRN_NORMAL_RESUME)\n")) srn_inuse = 1; /* because (*srn_signal) cv_waits */ (*srn_signal)(SRN_TYPE_APM, SRN_NORMAL_RESUME); srn_inuse = 0; } else { PMD(PMD_SX, ("cpr_suspend: srn_signal NULL\n")) } mutex_exit(&srn_clone_lock); #if defined(__sparc) rb_mp_offline: if (cpr_mp_online()) cpr_err(CE_WARN, "Failed to online all the processors."); #endif rb_others: PMD(PMD_SX, ("cpr_resume: dep thread\n")) pm_dispatch_to_dep_thread(PM_DEP_WK_CPR_RESUME, NULL, NULL, PM_DEP_WAIT, NULL, 0); PMD(PMD_SX, ("cpr_resume: CPR PM callback\n")) (void) callb_execute_class(CB_CL_CPR_PM, CB_CODE_CPR_RESUME); if (cpr_suspend_succeeded) { cpr_stat_record_events(); } #if defined(__sparc) if (sleeptype == CPR_TODISK && !cpr_reusable_mode) cpr_clear_definfo(); #endif i_cpr_free_cpus(); CPR_DEBUG(CPR_DEBUG1, "Sending SIGTHAW..."); PMD(PMD_SX, ("cpr_resume: SIGTHAW\n")) cpr_signal_user(SIGTHAW); CPR_DEBUG(CPR_DEBUG1, "done\n"); CPR_STAT_EVENT_END("Resume Total"); CPR_STAT_EVENT_START_TMZ("WHOLE CYCLE", &wholecycle_tv); CPR_STAT_EVENT_END("WHOLE CYCLE"); if (cpr_debug & CPR_DEBUG1) cmn_err(CE_CONT, "\nThe system is back where you left!\n"); CPR_STAT_EVENT_START("POST CPR DELAY"); #ifdef CPR_STAT ctp = &cpr_term.tm_shutdown; CPR_STAT_EVENT_START_TMZ("PWROFF TIME", ctp); CPR_STAT_EVENT_END_TMZ("PWROFF TIME", &pwron_tv); CPR_STAT_EVENT_PRINT(); #endif /* CPR_STAT */ PMD(PMD_SX, ("cpr_resume returns %x\n", rc)) return (rc); } static void cpr_suspend_init(int sleeptype) { cpr_time_t *ctp; cpr_stat_init(); /* * If cpr_suspend() failed before cpr_dump() gets a chance * to reinitialize the terminator of the statefile, * the values of the old terminator will still linger around. * Since the terminator contains information that we need to * decide whether suspend succeeded or not, we need to * reinitialize it as early as possible. */ cpr_term.real_statef_size = 0; ctp = &cpr_term.tm_shutdown; bzero(ctp, sizeof (*ctp)); ctp = &cpr_term.tm_cprboot_start; bzero(ctp, sizeof (*ctp)); ctp = &cpr_term.tm_cprboot_end; bzero(ctp, sizeof (*ctp)); if (sleeptype == CPR_TODISK) { /* * Lookup the physical address of our thread structure. * This should never be invalid and the entire thread structure * is expected to reside within the same pfn. */ curthreadpfn = hat_getpfnum(kas.a_hat, (caddr_t)curthread); ASSERT(curthreadpfn != PFN_INVALID); ASSERT(curthreadpfn == hat_getpfnum(kas.a_hat, (caddr_t)curthread + sizeof (kthread_t) - 1)); } cpr_suspend_succeeded = 0; } /* * bring all the offline cpus online */ static int cpr_all_online(void) { int rc = 0; #ifdef __sparc /* * do nothing */ #else cpu_t *cp; ASSERT(MUTEX_HELD(&cpu_lock)); cp = cpu_list; do { cp->cpu_cpr_flags &= ~CPU_CPR_ONLINE; if (!CPU_ACTIVE(cp)) { if ((rc = cpu_online(cp)) != 0) break; CPU_SET_CPR_FLAGS(cp, CPU_CPR_ONLINE); } } while ((cp = cp->cpu_next) != cpu_list); if (rc) { /* * an online operation failed so offline the cpus * that were onlined above to restore the system * to its original state */ cpr_restore_offline(); } #endif return (rc); } /* * offline all the cpus that were brought online by cpr_all_online() */ static void cpr_restore_offline(void) { #ifdef __sparc /* * do nothing */ #else cpu_t *cp; int rc = 0; ASSERT(MUTEX_HELD(&cpu_lock)); cp = cpu_list; do { if (CPU_CPR_IS_ONLINE(cp)) { rc = cpu_offline(cp, 0); /* * this offline should work, since the cpu was * offline originally and was successfully onlined * by cpr_all_online() */ ASSERT(rc == 0); cp->cpu_cpr_flags &= ~CPU_CPR_ONLINE; } } while ((cp = cp->cpu_next) != cpu_list); #endif }