Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 1 | /* |
Paul Gortmaker | 47dbc90 | 2015-09-27 19:14:57 -0400 | [diff] [blame] | 2 | * Read-Copy Update tracing for hierarchical implementation. |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
Paul E. McKenney | 87de1cf | 2013-12-03 10:02:52 -0800 | [diff] [blame] | 15 | * along with this program; if not, you can access it online at |
| 16 | * http://www.gnu.org/licenses/gpl-2.0.html. |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 17 | * |
| 18 | * Copyright IBM Corporation, 2008 |
Paul Gortmaker | 47dbc90 | 2015-09-27 19:14:57 -0400 | [diff] [blame] | 19 | * Author: Paul E. McKenney |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 20 | * |
| 21 | * Papers: http://www.rdrop.com/users/paulmck/RCU |
| 22 | * |
| 23 | * For detailed explanation of Read-Copy Update mechanism see - |
Paul E. McKenney | a71fca5 | 2009-09-18 10:28:19 -0700 | [diff] [blame] | 24 | * Documentation/RCU |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 25 | * |
| 26 | */ |
| 27 | #include <linux/types.h> |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/smp.h> |
| 32 | #include <linux/rcupdate.h> |
| 33 | #include <linux/interrupt.h> |
| 34 | #include <linux/sched.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 35 | #include <linux/atomic.h> |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 36 | #include <linux/bitops.h> |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 37 | #include <linux/completion.h> |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 38 | #include <linux/percpu.h> |
| 39 | #include <linux/notifier.h> |
| 40 | #include <linux/cpu.h> |
| 41 | #include <linux/mutex.h> |
| 42 | #include <linux/debugfs.h> |
| 43 | #include <linux/seq_file.h> |
| 44 | |
Paul E. McKenney | 9f77da9 | 2009-08-22 13:56:45 -0700 | [diff] [blame] | 45 | #define RCU_TREE_NONCORE |
Paul E. McKenney | 4102ada | 2013-10-08 20:23:47 -0700 | [diff] [blame] | 46 | #include "tree.h" |
Ingo Molnar | 6258c4f | 2009-03-25 16:42:24 +0100 | [diff] [blame] | 47 | |
Paul E. McKenney | 5cd3719 | 2014-12-13 20:32:04 -0800 | [diff] [blame] | 48 | DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, rcu_qs_ctr); |
| 49 | |
Michael Wang | 374b928 | 2012-09-20 08:51:03 +0800 | [diff] [blame] | 50 | static int r_open(struct inode *inode, struct file *file, |
| 51 | const struct seq_operations *op) |
| 52 | { |
| 53 | int ret = seq_open(file, op); |
| 54 | if (!ret) { |
| 55 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 56 | m->private = inode->i_private; |
| 57 | } |
| 58 | return ret; |
| 59 | } |
| 60 | |
| 61 | static void *r_start(struct seq_file *m, loff_t *pos) |
| 62 | { |
| 63 | struct rcu_state *rsp = (struct rcu_state *)m->private; |
| 64 | *pos = cpumask_next(*pos - 1, cpu_possible_mask); |
| 65 | if ((*pos) < nr_cpu_ids) |
| 66 | return per_cpu_ptr(rsp->rda, *pos); |
| 67 | return NULL; |
| 68 | } |
| 69 | |
| 70 | static void *r_next(struct seq_file *m, void *v, loff_t *pos) |
| 71 | { |
| 72 | (*pos)++; |
| 73 | return r_start(m, pos); |
| 74 | } |
| 75 | |
| 76 | static void r_stop(struct seq_file *m, void *v) |
| 77 | { |
| 78 | } |
| 79 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 80 | static int show_rcubarrier(struct seq_file *m, void *v) |
Michael Wang | c25e557 | 2012-10-08 16:59:16 +0800 | [diff] [blame] | 81 | { |
| 82 | struct rcu_state *rsp = (struct rcu_state *)m->private; |
Paul E. McKenney | 4f525a5 | 2015-06-26 11:20:00 -0700 | [diff] [blame] | 83 | seq_printf(m, "bcc: %d bseq: %lu\n", |
Michael Wang | c25e557 | 2012-10-08 16:59:16 +0800 | [diff] [blame] | 84 | atomic_read(&rsp->barrier_cpu_count), |
Paul E. McKenney | 4f525a5 | 2015-06-26 11:20:00 -0700 | [diff] [blame] | 85 | rsp->barrier_sequence); |
Michael Wang | c25e557 | 2012-10-08 16:59:16 +0800 | [diff] [blame] | 86 | return 0; |
| 87 | } |
| 88 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 89 | static int rcubarrier_open(struct inode *inode, struct file *file) |
Michael Wang | c25e557 | 2012-10-08 16:59:16 +0800 | [diff] [blame] | 90 | { |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 91 | return single_open(file, show_rcubarrier, inode->i_private); |
Michael Wang | c25e557 | 2012-10-08 16:59:16 +0800 | [diff] [blame] | 92 | } |
| 93 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 94 | static const struct file_operations rcubarrier_fops = { |
Michael Wang | c25e557 | 2012-10-08 16:59:16 +0800 | [diff] [blame] | 95 | .owner = THIS_MODULE, |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 96 | .open = rcubarrier_open, |
Michael Wang | c25e557 | 2012-10-08 16:59:16 +0800 | [diff] [blame] | 97 | .read = seq_read, |
| 98 | .llseek = no_llseek, |
Al Viro | 7ee2b9e | 2013-05-05 00:16:35 -0400 | [diff] [blame] | 99 | .release = single_release, |
Michael Wang | c25e557 | 2012-10-08 16:59:16 +0800 | [diff] [blame] | 100 | }; |
| 101 | |
Paul E. McKenney | a46e089 | 2011-06-15 15:47:09 -0700 | [diff] [blame] | 102 | #ifdef CONFIG_RCU_BOOST |
| 103 | |
Paul E. McKenney | d71df90 | 2011-03-29 17:48:28 -0700 | [diff] [blame] | 104 | static char convert_kthread_status(unsigned int kthread_status) |
| 105 | { |
| 106 | if (kthread_status > RCU_KTHREAD_MAX) |
| 107 | return '?'; |
Paul E. McKenney | 15ba0ba | 2011-04-06 16:01:16 -0700 | [diff] [blame] | 108 | return "SRWOY"[kthread_status]; |
Paul E. McKenney | d71df90 | 2011-03-29 17:48:28 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Paul E. McKenney | a46e089 | 2011-06-15 15:47:09 -0700 | [diff] [blame] | 111 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
| 112 | |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 113 | static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp) |
| 114 | { |
Paul E. McKenney | 3fbfbf7 | 2012-08-19 21:35:53 -0700 | [diff] [blame] | 115 | long ql, qll; |
| 116 | |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 117 | if (!rdp->beenonline) |
| 118 | return; |
Paul E. McKenney | 0d43eb3 | 2015-08-06 14:17:29 -0700 | [diff] [blame] | 119 | seq_printf(m, "%3d%cc=%ld g=%ld cnq=%d/%d:%d", |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 120 | rdp->cpu, |
| 121 | cpu_is_offline(rdp->cpu) ? '!' : ' ', |
Paul E. McKenney | 42c3533 | 2012-09-28 10:49:58 -0700 | [diff] [blame] | 122 | ulong2long(rdp->completed), ulong2long(rdp->gpnum), |
Paul E. McKenney | 5b74c45 | 2015-08-06 15:16:57 -0700 | [diff] [blame] | 123 | rdp->cpu_no_qs.b.norm, |
Paul E. McKenney | 5cd3719 | 2014-12-13 20:32:04 -0800 | [diff] [blame] | 124 | rdp->rcu_qs_ctr_snap == per_cpu(rcu_qs_ctr, rdp->cpu), |
Paul E. McKenney | 97c668b | 2015-08-06 11:31:51 -0700 | [diff] [blame] | 125 | rdp->core_needs_qs); |
Paul E. McKenney | 9b2e4f1 | 2011-09-30 12:10:22 -0700 | [diff] [blame] | 126 | seq_printf(m, " dt=%d/%llx/%d df=%lu", |
Paul E. McKenney | 23b5c8f | 2010-09-07 10:38:22 -0700 | [diff] [blame] | 127 | atomic_read(&rdp->dynticks->dynticks), |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 128 | rdp->dynticks->dynticks_nesting, |
Paul E. McKenney | 23b5c8f | 2010-09-07 10:38:22 -0700 | [diff] [blame] | 129 | rdp->dynticks->dynticks_nmi_nesting, |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 130 | rdp->dynticks_fqs); |
Paul E. McKenney | 2036d94 | 2012-01-30 17:02:47 -0800 | [diff] [blame] | 131 | seq_printf(m, " of=%lu", rdp->offline_fqs); |
Paul E. McKenney | 3fbfbf7 | 2012-08-19 21:35:53 -0700 | [diff] [blame] | 132 | rcu_nocb_q_lengths(rdp, &ql, &qll); |
| 133 | qll += rdp->qlen_lazy; |
| 134 | ql += rdp->qlen; |
Paul E. McKenney | 486e259 | 2012-01-06 14:11:30 -0800 | [diff] [blame] | 135 | seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c", |
Paul E. McKenney | 3fbfbf7 | 2012-08-19 21:35:53 -0700 | [diff] [blame] | 136 | qll, ql, |
Paul E. McKenney | 0ac3d13 | 2011-03-28 15:47:07 -0700 | [diff] [blame] | 137 | ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] != |
| 138 | rdp->nxttail[RCU_NEXT_TAIL]], |
| 139 | ".R"[rdp->nxttail[RCU_WAIT_TAIL] != |
| 140 | rdp->nxttail[RCU_NEXT_READY_TAIL]], |
| 141 | ".W"[rdp->nxttail[RCU_DONE_TAIL] != |
| 142 | rdp->nxttail[RCU_WAIT_TAIL]], |
Paul E. McKenney | a46e089 | 2011-06-15 15:47:09 -0700 | [diff] [blame] | 143 | ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]); |
| 144 | #ifdef CONFIG_RCU_BOOST |
Paul E. McKenney | 62ab707 | 2012-07-16 10:42:38 +0000 | [diff] [blame] | 145 | seq_printf(m, " kt=%d/%c ktl=%x", |
Paul E. McKenney | d71df90 | 2011-03-29 17:48:28 -0700 | [diff] [blame] | 146 | per_cpu(rcu_cpu_has_work, rdp->cpu), |
| 147 | convert_kthread_status(per_cpu(rcu_cpu_kthread_status, |
| 148 | rdp->cpu)), |
Paul E. McKenney | a46e089 | 2011-06-15 15:47:09 -0700 | [diff] [blame] | 149 | per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff); |
| 150 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
| 151 | seq_printf(m, " b=%ld", rdp->blimit); |
Paul E. McKenney | c635a4e1 | 2012-10-29 07:29:20 -0700 | [diff] [blame] | 152 | seq_printf(m, " ci=%lu nci=%lu co=%lu ca=%lu\n", |
| 153 | rdp->n_cbs_invoked, rdp->n_nocbs_invoked, |
| 154 | rdp->n_cbs_orphaned, rdp->n_cbs_adopted); |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 155 | } |
| 156 | |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 157 | static int show_rcudata(struct seq_file *m, void *v) |
Michael Wang | 878eda7 | 2012-09-20 08:51:04 +0800 | [diff] [blame] | 158 | { |
| 159 | print_one_rcu_data(m, (struct rcu_data *)v); |
| 160 | return 0; |
| 161 | } |
| 162 | |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 163 | static const struct seq_operations rcudate_op = { |
Michael Wang | 878eda7 | 2012-09-20 08:51:04 +0800 | [diff] [blame] | 164 | .start = r_start, |
| 165 | .next = r_next, |
| 166 | .stop = r_stop, |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 167 | .show = show_rcudata, |
Michael Wang | 878eda7 | 2012-09-20 08:51:04 +0800 | [diff] [blame] | 168 | }; |
| 169 | |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 170 | static int rcudata_open(struct inode *inode, struct file *file) |
Michael Wang | 878eda7 | 2012-09-20 08:51:04 +0800 | [diff] [blame] | 171 | { |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 172 | return r_open(inode, file, &rcudate_op); |
Michael Wang | 878eda7 | 2012-09-20 08:51:04 +0800 | [diff] [blame] | 173 | } |
| 174 | |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 175 | static const struct file_operations rcudata_fops = { |
Michael Wang | 878eda7 | 2012-09-20 08:51:04 +0800 | [diff] [blame] | 176 | .owner = THIS_MODULE, |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 177 | .open = rcudata_open, |
Michael Wang | 878eda7 | 2012-09-20 08:51:04 +0800 | [diff] [blame] | 178 | .read = seq_read, |
| 179 | .llseek = no_llseek, |
| 180 | .release = seq_release, |
| 181 | }; |
| 182 | |
Paul E. McKenney | 7bd8f2a | 2012-10-11 17:14:32 -0700 | [diff] [blame] | 183 | static int show_rcuexp(struct seq_file *m, void *v) |
| 184 | { |
Paul E. McKenney | df5bd51 | 2015-10-01 10:26:24 -0700 | [diff] [blame] | 185 | int cpu; |
Paul E. McKenney | 7bd8f2a | 2012-10-11 17:14:32 -0700 | [diff] [blame] | 186 | struct rcu_state *rsp = (struct rcu_state *)m->private; |
Paul E. McKenney | df5bd51 | 2015-10-01 10:26:24 -0700 | [diff] [blame] | 187 | struct rcu_data *rdp; |
Paul E. McKenney | 8b355e3 | 2016-06-29 13:46:25 -0700 | [diff] [blame] | 188 | unsigned long s0 = 0, s1 = 0, s2 = 0, s3 = 0; |
Paul E. McKenney | 7bd8f2a | 2012-10-11 17:14:32 -0700 | [diff] [blame] | 189 | |
Paul E. McKenney | df5bd51 | 2015-10-01 10:26:24 -0700 | [diff] [blame] | 190 | for_each_possible_cpu(cpu) { |
| 191 | rdp = per_cpu_ptr(rsp->rda, cpu); |
Paul E. McKenney | 8b355e3 | 2016-06-29 13:46:25 -0700 | [diff] [blame] | 192 | s0 += atomic_long_read(&rdp->exp_workdone0); |
Paul E. McKenney | d40a4f0 | 2016-03-08 14:43:44 -0800 | [diff] [blame] | 193 | s1 += atomic_long_read(&rdp->exp_workdone1); |
| 194 | s2 += atomic_long_read(&rdp->exp_workdone2); |
| 195 | s3 += atomic_long_read(&rdp->exp_workdone3); |
Paul E. McKenney | df5bd51 | 2015-10-01 10:26:24 -0700 | [diff] [blame] | 196 | } |
Paul E. McKenney | 8b355e3 | 2016-06-29 13:46:25 -0700 | [diff] [blame] | 197 | seq_printf(m, "s=%lu wd0=%lu wd1=%lu wd2=%lu wd3=%lu n=%lu enq=%d sc=%lu\n", |
| 198 | rsp->expedited_sequence, s0, s1, s2, s3, |
Paul E. McKenney | 7bd8f2a | 2012-10-11 17:14:32 -0700 | [diff] [blame] | 199 | atomic_long_read(&rsp->expedited_normal), |
Peter Zijlstra | 3a6d7c6 | 2015-06-25 11:27:10 -0700 | [diff] [blame] | 200 | atomic_read(&rsp->expedited_need_qs), |
Paul E. McKenney | d6ada2c | 2015-06-24 10:46:30 -0700 | [diff] [blame] | 201 | rsp->expedited_sequence / 2); |
Paul E. McKenney | 7bd8f2a | 2012-10-11 17:14:32 -0700 | [diff] [blame] | 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | static int rcuexp_open(struct inode *inode, struct file *file) |
| 206 | { |
| 207 | return single_open(file, show_rcuexp, inode->i_private); |
| 208 | } |
| 209 | |
| 210 | static const struct file_operations rcuexp_fops = { |
| 211 | .owner = THIS_MODULE, |
| 212 | .open = rcuexp_open, |
| 213 | .read = seq_read, |
| 214 | .llseek = no_llseek, |
Al Viro | 7ee2b9e | 2013-05-05 00:16:35 -0400 | [diff] [blame] | 215 | .release = single_release, |
Paul E. McKenney | 7bd8f2a | 2012-10-11 17:14:32 -0700 | [diff] [blame] | 216 | }; |
| 217 | |
Paul E. McKenney | 0ea1f2e | 2011-02-22 13:42:43 -0800 | [diff] [blame] | 218 | #ifdef CONFIG_RCU_BOOST |
| 219 | |
| 220 | static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp) |
| 221 | { |
Paul E. McKenney | 5cf05ad | 2012-05-17 15:12:45 -0700 | [diff] [blame] | 222 | seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ", |
Paul E. McKenney | 0ea1f2e | 2011-02-22 13:42:43 -0800 | [diff] [blame] | 223 | rnp->grplo, rnp->grphi, |
| 224 | "T."[list_empty(&rnp->blkd_tasks)], |
| 225 | "N."[!rnp->gp_tasks], |
| 226 | "E."[!rnp->exp_tasks], |
| 227 | "B."[!rnp->boost_tasks], |
Paul E. McKenney | d71df90 | 2011-03-29 17:48:28 -0700 | [diff] [blame] | 228 | convert_kthread_status(rnp->boost_kthread_status), |
Paul E. McKenney | 0ea1f2e | 2011-02-22 13:42:43 -0800 | [diff] [blame] | 229 | rnp->n_tasks_boosted, rnp->n_exp_boosts, |
Paul E. McKenney | 5cf05ad | 2012-05-17 15:12:45 -0700 | [diff] [blame] | 230 | rnp->n_normal_boosts); |
| 231 | seq_printf(m, "j=%04x bt=%04x\n", |
Paul E. McKenney | 0ea1f2e | 2011-02-22 13:42:43 -0800 | [diff] [blame] | 232 | (int)(jiffies & 0xffff), |
| 233 | (int)(rnp->boost_time & 0xffff)); |
Paul E. McKenney | 5cf05ad | 2012-05-17 15:12:45 -0700 | [diff] [blame] | 234 | seq_printf(m, " balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n", |
Paul E. McKenney | 0ea1f2e | 2011-02-22 13:42:43 -0800 | [diff] [blame] | 235 | rnp->n_balk_blkd_tasks, |
| 236 | rnp->n_balk_exp_gp_tasks, |
| 237 | rnp->n_balk_boost_tasks, |
| 238 | rnp->n_balk_notblocked, |
| 239 | rnp->n_balk_notyet, |
| 240 | rnp->n_balk_nos); |
| 241 | } |
| 242 | |
| 243 | static int show_rcu_node_boost(struct seq_file *m, void *unused) |
| 244 | { |
| 245 | struct rcu_node *rnp; |
| 246 | |
| 247 | rcu_for_each_leaf_node(&rcu_preempt_state, rnp) |
| 248 | print_one_rcu_node_boost(m, rnp); |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | static int rcu_node_boost_open(struct inode *inode, struct file *file) |
| 253 | { |
| 254 | return single_open(file, show_rcu_node_boost, NULL); |
| 255 | } |
| 256 | |
| 257 | static const struct file_operations rcu_node_boost_fops = { |
| 258 | .owner = THIS_MODULE, |
| 259 | .open = rcu_node_boost_open, |
| 260 | .read = seq_read, |
Michael Wang | 29c6776 | 2012-10-08 16:59:17 +0800 | [diff] [blame] | 261 | .llseek = no_llseek, |
Paul E. McKenney | 0ea1f2e | 2011-02-22 13:42:43 -0800 | [diff] [blame] | 262 | .release = single_release, |
| 263 | }; |
| 264 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 265 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
Paul E. McKenney | 0ea1f2e | 2011-02-22 13:42:43 -0800 | [diff] [blame] | 266 | |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 267 | static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp) |
| 268 | { |
Paul E. McKenney | 20133cf | 2010-02-22 17:05:01 -0800 | [diff] [blame] | 269 | unsigned long gpnum; |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 270 | int level = 0; |
| 271 | struct rcu_node *rnp; |
| 272 | |
Paul E. McKenney | 3397e04 | 2009-10-14 16:36:38 -0700 | [diff] [blame] | 273 | gpnum = rsp->gpnum; |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 274 | seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x ", |
| 275 | ulong2long(rsp->completed), ulong2long(gpnum), |
Petr Mladek | 77f81fe | 2015-09-09 12:09:49 -0700 | [diff] [blame] | 276 | rsp->gp_state, |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 277 | (long)(rsp->jiffies_force_qs - jiffies), |
Paul E. McKenney | 5cf05ad | 2012-05-17 15:12:45 -0700 | [diff] [blame] | 278 | (int)(jiffies & 0xffff)); |
| 279 | seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n", |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 280 | rsp->n_force_qs, rsp->n_force_qs_ngp, |
| 281 | rsp->n_force_qs - rsp->n_force_qs_ngp, |
Paul E. McKenney | 7d0ae80 | 2015-03-03 14:57:58 -0800 | [diff] [blame] | 282 | READ_ONCE(rsp->n_force_qs_lh), rsp->qlen_lazy, rsp->qlen); |
Paul E. McKenney | f885b7f | 2012-04-23 15:52:53 -0700 | [diff] [blame] | 283 | for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) { |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 284 | if (rnp->level != level) { |
| 285 | seq_puts(m, "\n"); |
| 286 | level = rnp->level; |
| 287 | } |
Paul E. McKenney | 0aa04b0 | 2015-01-23 21:52:37 -0800 | [diff] [blame] | 288 | seq_printf(m, "%lx/%lx->%lx %c%c>%c %d:%d ^%d ", |
| 289 | rnp->qsmask, rnp->qsmaskinit, rnp->qsmaskinitnext, |
Paul E. McKenney | 12f5f52 | 2010-11-29 21:56:39 -0800 | [diff] [blame] | 290 | ".G"[rnp->gp_tasks != NULL], |
| 291 | ".E"[rnp->exp_tasks != NULL], |
| 292 | ".T"[!list_empty(&rnp->blkd_tasks)], |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 293 | rnp->grplo, rnp->grphi, rnp->grpnum); |
| 294 | } |
| 295 | seq_puts(m, "\n"); |
| 296 | } |
| 297 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 298 | static int show_rcuhier(struct seq_file *m, void *v) |
Michael Wang | a608d84 | 2012-10-08 16:59:19 +0800 | [diff] [blame] | 299 | { |
| 300 | struct rcu_state *rsp = (struct rcu_state *)m->private; |
| 301 | print_one_rcu_state(m, rsp); |
| 302 | return 0; |
| 303 | } |
| 304 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 305 | static int rcuhier_open(struct inode *inode, struct file *file) |
Michael Wang | a608d84 | 2012-10-08 16:59:19 +0800 | [diff] [blame] | 306 | { |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 307 | return single_open(file, show_rcuhier, inode->i_private); |
Michael Wang | a608d84 | 2012-10-08 16:59:19 +0800 | [diff] [blame] | 308 | } |
| 309 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 310 | static const struct file_operations rcuhier_fops = { |
Michael Wang | a608d84 | 2012-10-08 16:59:19 +0800 | [diff] [blame] | 311 | .owner = THIS_MODULE, |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 312 | .open = rcuhier_open, |
Michael Wang | a608d84 | 2012-10-08 16:59:19 +0800 | [diff] [blame] | 313 | .read = seq_read, |
| 314 | .llseek = no_llseek, |
Al Viro | 7ee2b9e | 2013-05-05 00:16:35 -0400 | [diff] [blame] | 315 | .release = single_release, |
Michael Wang | a608d84 | 2012-10-08 16:59:19 +0800 | [diff] [blame] | 316 | }; |
| 317 | |
Paul E. McKenney | 15ba0ba | 2011-04-06 16:01:16 -0700 | [diff] [blame] | 318 | static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp) |
| 319 | { |
| 320 | unsigned long flags; |
| 321 | unsigned long completed; |
| 322 | unsigned long gpnum; |
| 323 | unsigned long gpage; |
| 324 | unsigned long gpmax; |
| 325 | struct rcu_node *rnp = &rsp->node[0]; |
| 326 | |
Paul E. McKenney | 6cf1008 | 2015-10-08 15:36:54 -0700 | [diff] [blame] | 327 | raw_spin_lock_irqsave_rcu_node(rnp, flags); |
Paul E. McKenney | 7d0ae80 | 2015-03-03 14:57:58 -0800 | [diff] [blame] | 328 | completed = READ_ONCE(rsp->completed); |
| 329 | gpnum = READ_ONCE(rsp->gpnum); |
Paul E. McKenney | 42c3533 | 2012-09-28 10:49:58 -0700 | [diff] [blame] | 330 | if (completed == gpnum) |
Paul E. McKenney | 15ba0ba | 2011-04-06 16:01:16 -0700 | [diff] [blame] | 331 | gpage = 0; |
| 332 | else |
| 333 | gpage = jiffies - rsp->gp_start; |
| 334 | gpmax = rsp->gp_max; |
| 335 | raw_spin_unlock_irqrestore(&rnp->lock, flags); |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 336 | seq_printf(m, "completed=%ld gpnum=%ld age=%ld max=%ld\n", |
| 337 | ulong2long(completed), ulong2long(gpnum), gpage, gpmax); |
Paul E. McKenney | 15ba0ba | 2011-04-06 16:01:16 -0700 | [diff] [blame] | 338 | } |
| 339 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 340 | static int show_rcugp(struct seq_file *m, void *v) |
Michael Wang | 66b38bc | 2012-10-08 16:59:18 +0800 | [diff] [blame] | 341 | { |
| 342 | struct rcu_state *rsp = (struct rcu_state *)m->private; |
| 343 | show_one_rcugp(m, rsp); |
| 344 | return 0; |
| 345 | } |
| 346 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 347 | static int rcugp_open(struct inode *inode, struct file *file) |
Michael Wang | 66b38bc | 2012-10-08 16:59:18 +0800 | [diff] [blame] | 348 | { |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 349 | return single_open(file, show_rcugp, inode->i_private); |
Michael Wang | 66b38bc | 2012-10-08 16:59:18 +0800 | [diff] [blame] | 350 | } |
| 351 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 352 | static const struct file_operations rcugp_fops = { |
Michael Wang | 66b38bc | 2012-10-08 16:59:18 +0800 | [diff] [blame] | 353 | .owner = THIS_MODULE, |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 354 | .open = rcugp_open, |
Michael Wang | 66b38bc | 2012-10-08 16:59:18 +0800 | [diff] [blame] | 355 | .read = seq_read, |
| 356 | .llseek = no_llseek, |
Al Viro | 7ee2b9e | 2013-05-05 00:16:35 -0400 | [diff] [blame] | 357 | .release = single_release, |
Michael Wang | 66b38bc | 2012-10-08 16:59:18 +0800 | [diff] [blame] | 358 | }; |
| 359 | |
Paul E. McKenney | 7ba5c84 | 2009-04-13 21:31:17 -0700 | [diff] [blame] | 360 | static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp) |
| 361 | { |
Michael Wang | 51d0f16 | 2012-09-20 08:51:06 +0800 | [diff] [blame] | 362 | if (!rdp->beenonline) |
| 363 | return; |
Paul E. McKenney | 5cf05ad | 2012-05-17 15:12:45 -0700 | [diff] [blame] | 364 | seq_printf(m, "%3d%cnp=%ld ", |
Paul E. McKenney | 7ba5c84 | 2009-04-13 21:31:17 -0700 | [diff] [blame] | 365 | rdp->cpu, |
| 366 | cpu_is_offline(rdp->cpu) ? '!' : ' ', |
Paul E. McKenney | 5cf05ad | 2012-05-17 15:12:45 -0700 | [diff] [blame] | 367 | rdp->n_rcu_pending); |
| 368 | seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ", |
Paul E. McKenney | 97c668b | 2015-08-06 11:31:51 -0700 | [diff] [blame] | 369 | rdp->n_rp_core_needs_qs, |
Paul E. McKenney | d21670a | 2010-04-14 17:39:26 -0700 | [diff] [blame] | 370 | rdp->n_rp_report_qs, |
Paul E. McKenney | 7ba5c84 | 2009-04-13 21:31:17 -0700 | [diff] [blame] | 371 | rdp->n_rp_cb_ready, |
Paul E. McKenney | 5cf05ad | 2012-05-17 15:12:45 -0700 | [diff] [blame] | 372 | rdp->n_rp_cpu_needs_gp); |
Paul E. McKenney | 96d3fd0 | 2013-10-04 14:33:34 -0700 | [diff] [blame] | 373 | seq_printf(m, "gpc=%ld gps=%ld nn=%ld ndw%ld\n", |
Paul E. McKenney | 7ba5c84 | 2009-04-13 21:31:17 -0700 | [diff] [blame] | 374 | rdp->n_rp_gp_completed, |
| 375 | rdp->n_rp_gp_started, |
Paul E. McKenney | 96d3fd0 | 2013-10-04 14:33:34 -0700 | [diff] [blame] | 376 | rdp->n_rp_nocb_defer_wakeup, |
Paul E. McKenney | 7ba5c84 | 2009-04-13 21:31:17 -0700 | [diff] [blame] | 377 | rdp->n_rp_need_nothing); |
| 378 | } |
| 379 | |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 380 | static int show_rcu_pending(struct seq_file *m, void *v) |
Michael Wang | 51d0f16 | 2012-09-20 08:51:06 +0800 | [diff] [blame] | 381 | { |
| 382 | print_one_rcu_pending(m, (struct rcu_data *)v); |
| 383 | return 0; |
| 384 | } |
| 385 | |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 386 | static const struct seq_operations rcu_pending_op = { |
Michael Wang | 51d0f16 | 2012-09-20 08:51:06 +0800 | [diff] [blame] | 387 | .start = r_start, |
| 388 | .next = r_next, |
| 389 | .stop = r_stop, |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 390 | .show = show_rcu_pending, |
Michael Wang | 51d0f16 | 2012-09-20 08:51:06 +0800 | [diff] [blame] | 391 | }; |
| 392 | |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 393 | static int rcu_pending_open(struct inode *inode, struct file *file) |
Michael Wang | 51d0f16 | 2012-09-20 08:51:06 +0800 | [diff] [blame] | 394 | { |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 395 | return r_open(inode, file, &rcu_pending_op); |
Michael Wang | 51d0f16 | 2012-09-20 08:51:06 +0800 | [diff] [blame] | 396 | } |
| 397 | |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 398 | static const struct file_operations rcu_pending_fops = { |
Michael Wang | 51d0f16 | 2012-09-20 08:51:06 +0800 | [diff] [blame] | 399 | .owner = THIS_MODULE, |
Michael Wang | c011c41 | 2012-09-20 08:51:07 +0800 | [diff] [blame] | 400 | .open = rcu_pending_open, |
Michael Wang | 51d0f16 | 2012-09-20 08:51:06 +0800 | [diff] [blame] | 401 | .read = seq_read, |
| 402 | .llseek = no_llseek, |
| 403 | .release = seq_release, |
| 404 | }; |
| 405 | |
Paul E. McKenney | 4a29865 | 2011-04-03 21:33:51 -0700 | [diff] [blame] | 406 | static int show_rcutorture(struct seq_file *m, void *unused) |
| 407 | { |
| 408 | seq_printf(m, "rcutorture test sequence: %lu %s\n", |
| 409 | rcutorture_testseq >> 1, |
| 410 | (rcutorture_testseq & 0x1) ? "(test in progress)" : ""); |
| 411 | seq_printf(m, "rcutorture update version number: %lu\n", |
| 412 | rcutorture_vernum); |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | static int rcutorture_open(struct inode *inode, struct file *file) |
| 417 | { |
| 418 | return single_open(file, show_rcutorture, NULL); |
| 419 | } |
| 420 | |
| 421 | static const struct file_operations rcutorture_fops = { |
| 422 | .owner = THIS_MODULE, |
| 423 | .open = rcutorture_open, |
| 424 | .read = seq_read, |
| 425 | .llseek = seq_lseek, |
| 426 | .release = single_release, |
| 427 | }; |
| 428 | |
Paul E. McKenney | 7ba5c84 | 2009-04-13 21:31:17 -0700 | [diff] [blame] | 429 | static struct dentry *rcudir; |
Paul E. McKenney | 7ba5c84 | 2009-04-13 21:31:17 -0700 | [diff] [blame] | 430 | |
Paul E. McKenney | deb7a41 | 2010-09-30 21:33:32 -0700 | [diff] [blame] | 431 | static int __init rcutree_trace_init(void) |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 432 | { |
Michael Wang | 573bcd40 | 2012-09-20 08:51:02 +0800 | [diff] [blame] | 433 | struct rcu_state *rsp; |
Paul E. McKenney | 22f00b6 | 2009-08-22 13:56:50 -0700 | [diff] [blame] | 434 | struct dentry *retval; |
Michael Wang | 573bcd40 | 2012-09-20 08:51:02 +0800 | [diff] [blame] | 435 | struct dentry *rspdir; |
Paul E. McKenney | 22f00b6 | 2009-08-22 13:56:50 -0700 | [diff] [blame] | 436 | |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 437 | rcudir = debugfs_create_dir("rcu", NULL); |
| 438 | if (!rcudir) |
Paul E. McKenney | 22f00b6 | 2009-08-22 13:56:50 -0700 | [diff] [blame] | 439 | goto free_out; |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 440 | |
Michael Wang | 573bcd40 | 2012-09-20 08:51:02 +0800 | [diff] [blame] | 441 | for_each_rcu_flavor(rsp) { |
| 442 | rspdir = debugfs_create_dir(rsp->name, rcudir); |
| 443 | if (!rspdir) |
| 444 | goto free_out; |
Michael Wang | 878eda7 | 2012-09-20 08:51:04 +0800 | [diff] [blame] | 445 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 446 | retval = debugfs_create_file("rcudata", 0444, |
| 447 | rspdir, rsp, &rcudata_fops); |
| 448 | if (!retval) |
| 449 | goto free_out; |
Michael Wang | d29200e | 2012-09-20 08:51:05 +0800 | [diff] [blame] | 450 | |
Paul E. McKenney | 7bd8f2a | 2012-10-11 17:14:32 -0700 | [diff] [blame] | 451 | retval = debugfs_create_file("rcuexp", 0444, |
| 452 | rspdir, rsp, &rcuexp_fops); |
| 453 | if (!retval) |
| 454 | goto free_out; |
| 455 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 456 | retval = debugfs_create_file("rcu_pending", 0444, |
| 457 | rspdir, rsp, &rcu_pending_fops); |
| 458 | if (!retval) |
| 459 | goto free_out; |
Michael Wang | c25e557 | 2012-10-08 16:59:16 +0800 | [diff] [blame] | 460 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 461 | retval = debugfs_create_file("rcubarrier", 0444, |
| 462 | rspdir, rsp, &rcubarrier_fops); |
| 463 | if (!retval) |
| 464 | goto free_out; |
Michael Wang | 29c6776 | 2012-10-08 16:59:17 +0800 | [diff] [blame] | 465 | |
| 466 | #ifdef CONFIG_RCU_BOOST |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 467 | if (rsp == &rcu_preempt_state) { |
| 468 | retval = debugfs_create_file("rcuboost", 0444, |
| 469 | rspdir, NULL, &rcu_node_boost_fops); |
| 470 | if (!retval) |
| 471 | goto free_out; |
| 472 | } |
Michael Wang | 29c6776 | 2012-10-08 16:59:17 +0800 | [diff] [blame] | 473 | #endif |
Michael Wang | 66b38bc | 2012-10-08 16:59:18 +0800 | [diff] [blame] | 474 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 475 | retval = debugfs_create_file("rcugp", 0444, |
| 476 | rspdir, rsp, &rcugp_fops); |
| 477 | if (!retval) |
| 478 | goto free_out; |
Michael Wang | 66b38bc | 2012-10-08 16:59:18 +0800 | [diff] [blame] | 479 | |
Michael Wang | 6ee0886 | 2012-10-11 14:26:42 -0700 | [diff] [blame] | 480 | retval = debugfs_create_file("rcuhier", 0444, |
| 481 | rspdir, rsp, &rcuhier_fops); |
| 482 | if (!retval) |
| 483 | goto free_out; |
Michael Wang | 573bcd40 | 2012-09-20 08:51:02 +0800 | [diff] [blame] | 484 | } |
| 485 | |
Paul E. McKenney | 4a29865 | 2011-04-03 21:33:51 -0700 | [diff] [blame] | 486 | retval = debugfs_create_file("rcutorture", 0444, rcudir, |
| 487 | NULL, &rcutorture_fops); |
| 488 | if (!retval) |
| 489 | goto free_out; |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 490 | return 0; |
| 491 | free_out: |
Paul E. McKenney | 22f00b6 | 2009-08-22 13:56:50 -0700 | [diff] [blame] | 492 | debugfs_remove_recursive(rcudir); |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 493 | return 1; |
| 494 | } |
Paul Gortmaker | 47dbc90 | 2015-09-27 19:14:57 -0400 | [diff] [blame] | 495 | device_initcall(rcutree_trace_init); |