Lines Matching refs:rnp
116 static void rcu_report_exp_rnp(struct rcu_node *rnp, bool wake);
162 static void rcu_preempt_ctxt_queue(struct rcu_node *rnp, struct rcu_data *rdp) in rcu_preempt_ctxt_queue() argument
163 __releases(rnp->lock) /* But leaves rrupts disabled. */ in rcu_preempt_ctxt_queue()
165 int blkd_state = (rnp->gp_tasks ? RCU_GP_TASKS : 0) + in rcu_preempt_ctxt_queue()
166 (rnp->exp_tasks ? RCU_EXP_TASKS : 0) + in rcu_preempt_ctxt_queue()
167 (rnp->qsmask & rdp->grpmask ? RCU_GP_BLKD : 0) + in rcu_preempt_ctxt_queue()
168 (rnp->expmask & rdp->grpmask ? RCU_EXP_BLKD : 0); in rcu_preempt_ctxt_queue()
171 raw_lockdep_assert_held_rcu_node(rnp); in rcu_preempt_ctxt_queue()
172 WARN_ON_ONCE(rdp->mynode != rnp); in rcu_preempt_ctxt_queue()
173 WARN_ON_ONCE(!rcu_is_leaf_node(rnp)); in rcu_preempt_ctxt_queue()
175 WARN_ON_ONCE(rnp->qsmaskinitnext & ~rnp->qsmaskinit & rnp->qsmask & in rcu_preempt_ctxt_queue()
196 list_add(&t->rcu_node_entry, &rnp->blkd_tasks); in rcu_preempt_ctxt_queue()
214 list_add_tail(&t->rcu_node_entry, &rnp->blkd_tasks); in rcu_preempt_ctxt_queue()
227 list_add(&t->rcu_node_entry, rnp->exp_tasks); in rcu_preempt_ctxt_queue()
238 list_add(&t->rcu_node_entry, rnp->gp_tasks); in rcu_preempt_ctxt_queue()
254 if (!rnp->gp_tasks && (blkd_state & RCU_GP_BLKD)) { in rcu_preempt_ctxt_queue()
255 WRITE_ONCE(rnp->gp_tasks, &t->rcu_node_entry); in rcu_preempt_ctxt_queue()
256 WARN_ON_ONCE(rnp->completedqs == rnp->gp_seq); in rcu_preempt_ctxt_queue()
258 if (!rnp->exp_tasks && (blkd_state & RCU_EXP_BLKD)) in rcu_preempt_ctxt_queue()
259 WRITE_ONCE(rnp->exp_tasks, &t->rcu_node_entry); in rcu_preempt_ctxt_queue()
261 !(rnp->qsmask & rdp->grpmask)); in rcu_preempt_ctxt_queue()
263 !(rnp->expmask & rdp->grpmask)); in rcu_preempt_ctxt_queue()
264 raw_spin_unlock_rcu_node(rnp); /* interrupts remain disabled. */ in rcu_preempt_ctxt_queue()
328 struct rcu_node *rnp; in rcu_note_context_switch() local
337 rnp = rdp->mynode; in rcu_note_context_switch()
338 raw_spin_lock_rcu_node(rnp); in rcu_note_context_switch()
340 t->rcu_blocked_node = rnp; in rcu_note_context_switch()
351 (rnp->qsmask & rdp->grpmask) in rcu_note_context_switch()
352 ? rnp->gp_seq in rcu_note_context_switch()
353 : rcu_seq_snap(&rnp->gp_seq)); in rcu_note_context_switch()
354 rcu_preempt_ctxt_queue(rnp, rdp); in rcu_note_context_switch()
381 static int rcu_preempt_blocked_readers_cgp(struct rcu_node *rnp) in rcu_preempt_blocked_readers_cgp() argument
383 return READ_ONCE(rnp->gp_tasks) != NULL; in rcu_preempt_blocked_readers_cgp()
453 struct rcu_node *rnp) in rcu_next_node_entry() argument
458 if (np == &rnp->blkd_tasks) in rcu_next_node_entry()
467 static bool rcu_preempt_has_tasks(struct rcu_node *rnp) in rcu_preempt_has_tasks() argument
469 return !list_empty(&rnp->blkd_tasks); in rcu_preempt_has_tasks()
486 struct rcu_node *rnp; in rcu_preempt_deferred_qs_irqrestore() local
529 rnp = t->rcu_blocked_node; in rcu_preempt_deferred_qs_irqrestore()
530 raw_spin_lock_rcu_node(rnp); /* irqs already disabled. */ in rcu_preempt_deferred_qs_irqrestore()
531 WARN_ON_ONCE(rnp != t->rcu_blocked_node); in rcu_preempt_deferred_qs_irqrestore()
532 WARN_ON_ONCE(!rcu_is_leaf_node(rnp)); in rcu_preempt_deferred_qs_irqrestore()
533 empty_norm = !rcu_preempt_blocked_readers_cgp(rnp); in rcu_preempt_deferred_qs_irqrestore()
534 WARN_ON_ONCE(rnp->completedqs == rnp->gp_seq && in rcu_preempt_deferred_qs_irqrestore()
535 (!empty_norm || rnp->qsmask)); in rcu_preempt_deferred_qs_irqrestore()
536 empty_exp = sync_rcu_exp_done(rnp); in rcu_preempt_deferred_qs_irqrestore()
538 np = rcu_next_node_entry(t, rnp); in rcu_preempt_deferred_qs_irqrestore()
542 rnp->gp_seq, t->pid); in rcu_preempt_deferred_qs_irqrestore()
543 if (&t->rcu_node_entry == rnp->gp_tasks) in rcu_preempt_deferred_qs_irqrestore()
544 WRITE_ONCE(rnp->gp_tasks, np); in rcu_preempt_deferred_qs_irqrestore()
545 if (&t->rcu_node_entry == rnp->exp_tasks) in rcu_preempt_deferred_qs_irqrestore()
546 WRITE_ONCE(rnp->exp_tasks, np); in rcu_preempt_deferred_qs_irqrestore()
549 drop_boost_mutex = rt_mutex_owner(&rnp->boost_mtx.rtmutex) == t; in rcu_preempt_deferred_qs_irqrestore()
550 if (&t->rcu_node_entry == rnp->boost_tasks) in rcu_preempt_deferred_qs_irqrestore()
551 WRITE_ONCE(rnp->boost_tasks, np); in rcu_preempt_deferred_qs_irqrestore()
560 empty_exp_now = sync_rcu_exp_done(rnp); in rcu_preempt_deferred_qs_irqrestore()
561 if (!empty_norm && !rcu_preempt_blocked_readers_cgp(rnp)) { in rcu_preempt_deferred_qs_irqrestore()
563 rnp->gp_seq, in rcu_preempt_deferred_qs_irqrestore()
564 0, rnp->qsmask, in rcu_preempt_deferred_qs_irqrestore()
565 rnp->level, in rcu_preempt_deferred_qs_irqrestore()
566 rnp->grplo, in rcu_preempt_deferred_qs_irqrestore()
567 rnp->grphi, in rcu_preempt_deferred_qs_irqrestore()
568 !!rnp->gp_tasks); in rcu_preempt_deferred_qs_irqrestore()
569 rcu_report_unblock_qs_rnp(rnp, flags); in rcu_preempt_deferred_qs_irqrestore()
571 raw_spin_unlock_irqrestore_rcu_node(rnp, flags); in rcu_preempt_deferred_qs_irqrestore()
579 rcu_report_exp_rnp(rnp, true); in rcu_preempt_deferred_qs_irqrestore()
583 rt_mutex_futex_unlock(&rnp->boost_mtx.rtmutex); in rcu_preempt_deferred_qs_irqrestore()
654 struct rcu_node *rnp = rdp->mynode; in rcu_read_unlock_special() local
657 (rdp->grpmask & READ_ONCE(rnp->expmask)) || in rcu_read_unlock_special()
659 ((rdp->grpmask & READ_ONCE(rnp->qsmask)) || t->rcu_blocked_node)) || in rcu_read_unlock_special()
705 static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp) in rcu_preempt_check_blocked_tasks() argument
710 raw_lockdep_assert_held_rcu_node(rnp); in rcu_preempt_check_blocked_tasks()
711 if (WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp))) in rcu_preempt_check_blocked_tasks()
712 dump_blkd_tasks(rnp, 10); in rcu_preempt_check_blocked_tasks()
713 if (rcu_preempt_has_tasks(rnp) && in rcu_preempt_check_blocked_tasks()
714 (rnp->qsmaskinit || rnp->wait_blkd_tasks)) { in rcu_preempt_check_blocked_tasks()
715 WRITE_ONCE(rnp->gp_tasks, rnp->blkd_tasks.next); in rcu_preempt_check_blocked_tasks()
716 t = container_of(rnp->gp_tasks, struct task_struct, in rcu_preempt_check_blocked_tasks()
719 rnp->gp_seq, t->pid); in rcu_preempt_check_blocked_tasks()
721 WARN_ON_ONCE(rnp->qsmask); in rcu_preempt_check_blocked_tasks()
790 dump_blkd_tasks(struct rcu_node *rnp, int ncheck) in dump_blkd_tasks() argument
798 raw_lockdep_assert_held_rcu_node(rnp); in dump_blkd_tasks()
800 __func__, rnp->grplo, rnp->grphi, rnp->level, in dump_blkd_tasks()
801 (long)READ_ONCE(rnp->gp_seq), (long)rnp->completedqs); in dump_blkd_tasks()
802 for (rnp1 = rnp; rnp1; rnp1 = rnp1->parent) in dump_blkd_tasks()
806 __func__, READ_ONCE(rnp->gp_tasks), data_race(rnp->boost_tasks), in dump_blkd_tasks()
807 READ_ONCE(rnp->exp_tasks)); in dump_blkd_tasks()
810 list_for_each(lhp, &rnp->blkd_tasks) { in dump_blkd_tasks()
816 for (cpu = rnp->grplo; cpu <= rnp->grphi; cpu++) { in dump_blkd_tasks()
934 static int rcu_preempt_blocked_readers_cgp(struct rcu_node *rnp) in rcu_preempt_blocked_readers_cgp() argument
942 static bool rcu_preempt_has_tasks(struct rcu_node *rnp) in rcu_preempt_has_tasks() argument
976 static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp) in rcu_preempt_check_blocked_tasks() argument
978 WARN_ON_ONCE(rnp->qsmask); in rcu_preempt_check_blocked_tasks()
1019 dump_blkd_tasks(struct rcu_node *rnp, int ncheck) in dump_blkd_tasks() argument
1021 WARN_ON_ONCE(!list_empty(&rnp->blkd_tasks)); in dump_blkd_tasks()
1071 static int rcu_boost(struct rcu_node *rnp) in rcu_boost() argument
1077 if (READ_ONCE(rnp->exp_tasks) == NULL && in rcu_boost()
1078 READ_ONCE(rnp->boost_tasks) == NULL) in rcu_boost()
1081 raw_spin_lock_irqsave_rcu_node(rnp, flags); in rcu_boost()
1087 if (rnp->exp_tasks == NULL && rnp->boost_tasks == NULL) { in rcu_boost()
1088 raw_spin_unlock_irqrestore_rcu_node(rnp, flags); in rcu_boost()
1098 if (rnp->exp_tasks != NULL) in rcu_boost()
1099 tb = rnp->exp_tasks; in rcu_boost()
1101 tb = rnp->boost_tasks; in rcu_boost()
1120 rt_mutex_init_proxy_locked(&rnp->boost_mtx.rtmutex, t); in rcu_boost()
1121 raw_spin_unlock_irqrestore_rcu_node(rnp, flags); in rcu_boost()
1123 rt_mutex_lock(&rnp->boost_mtx); in rcu_boost()
1124 rt_mutex_unlock(&rnp->boost_mtx); /* Then keep lockdep happy. */ in rcu_boost()
1125 rnp->n_boosts++; in rcu_boost()
1127 return READ_ONCE(rnp->exp_tasks) != NULL || in rcu_boost()
1128 READ_ONCE(rnp->boost_tasks) != NULL; in rcu_boost()
1136 struct rcu_node *rnp = (struct rcu_node *)arg; in rcu_boost_kthread() local
1142 WRITE_ONCE(rnp->boost_kthread_status, RCU_KTHREAD_WAITING); in rcu_boost_kthread()
1144 rcu_wait(READ_ONCE(rnp->boost_tasks) || in rcu_boost_kthread()
1145 READ_ONCE(rnp->exp_tasks)); in rcu_boost_kthread()
1147 WRITE_ONCE(rnp->boost_kthread_status, RCU_KTHREAD_RUNNING); in rcu_boost_kthread()
1148 more2boost = rcu_boost(rnp); in rcu_boost_kthread()
1154 WRITE_ONCE(rnp->boost_kthread_status, RCU_KTHREAD_YIELDING); in rcu_boost_kthread()
1176 static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags) in rcu_initiate_boost() argument
1177 __releases(rnp->lock) in rcu_initiate_boost()
1179 raw_lockdep_assert_held_rcu_node(rnp); in rcu_initiate_boost()
1180 if (!rnp->boost_kthread_task || in rcu_initiate_boost()
1181 (!rcu_preempt_blocked_readers_cgp(rnp) && !rnp->exp_tasks)) { in rcu_initiate_boost()
1182 raw_spin_unlock_irqrestore_rcu_node(rnp, flags); in rcu_initiate_boost()
1185 if (rnp->exp_tasks != NULL || in rcu_initiate_boost()
1186 (rnp->gp_tasks != NULL && in rcu_initiate_boost()
1187 rnp->boost_tasks == NULL && in rcu_initiate_boost()
1188 rnp->qsmask == 0 && in rcu_initiate_boost()
1189 (!time_after(rnp->boost_time, jiffies) || rcu_state.cbovld || in rcu_initiate_boost()
1191 if (rnp->exp_tasks == NULL) in rcu_initiate_boost()
1192 WRITE_ONCE(rnp->boost_tasks, rnp->gp_tasks); in rcu_initiate_boost()
1193 raw_spin_unlock_irqrestore_rcu_node(rnp, flags); in rcu_initiate_boost()
1194 rcu_wake_cond(rnp->boost_kthread_task, in rcu_initiate_boost()
1195 READ_ONCE(rnp->boost_kthread_status)); in rcu_initiate_boost()
1197 raw_spin_unlock_irqrestore_rcu_node(rnp, flags); in rcu_initiate_boost()
1206 static void rcu_preempt_boost_start_gp(struct rcu_node *rnp) in rcu_preempt_boost_start_gp() argument
1208 rnp->boost_time = jiffies + RCU_BOOST_DELAY_JIFFIES; in rcu_preempt_boost_start_gp()
1215 static void rcu_spawn_one_boost_kthread(struct rcu_node *rnp) in rcu_spawn_one_boost_kthread() argument
1218 int rnp_index = rnp - rcu_get_root(); in rcu_spawn_one_boost_kthread()
1222 if (rnp->boost_kthread_task) in rcu_spawn_one_boost_kthread()
1225 t = kthread_create(rcu_boost_kthread, (void *)rnp, in rcu_spawn_one_boost_kthread()
1230 raw_spin_lock_irqsave_rcu_node(rnp, flags); in rcu_spawn_one_boost_kthread()
1231 rnp->boost_kthread_task = t; in rcu_spawn_one_boost_kthread()
1232 raw_spin_unlock_irqrestore_rcu_node(rnp, flags); in rcu_spawn_one_boost_kthread()
1236 rcu_thread_affine_rnp(t, rnp); in rcu_spawn_one_boost_kthread()
1242 static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags) in rcu_initiate_boost() argument
1243 __releases(rnp->lock) in rcu_initiate_boost()
1245 raw_spin_unlock_irqrestore_rcu_node(rnp, flags); in rcu_initiate_boost()
1248 static void rcu_preempt_boost_start_gp(struct rcu_node *rnp) in rcu_preempt_boost_start_gp() argument
1252 static void rcu_spawn_one_boost_kthread(struct rcu_node *rnp) in rcu_spawn_one_boost_kthread() argument