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64db4cff PM |
1 | /* |
2 | * Read-Copy Update tracing for classic implementation | |
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 | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * Copyright IBM Corporation, 2008 | |
19 | * | |
20 | * Papers: http://www.rdrop.com/users/paulmck/RCU | |
21 | * | |
22 | * For detailed explanation of Read-Copy Update mechanism see - | |
a71fca58 | 23 | * Documentation/RCU |
64db4cff PM |
24 | * |
25 | */ | |
26 | #include <linux/types.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/smp.h> | |
31 | #include <linux/rcupdate.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/sched.h> | |
34 | #include <asm/atomic.h> | |
35 | #include <linux/bitops.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/completion.h> | |
38 | #include <linux/moduleparam.h> | |
39 | #include <linux/percpu.h> | |
40 | #include <linux/notifier.h> | |
41 | #include <linux/cpu.h> | |
42 | #include <linux/mutex.h> | |
43 | #include <linux/debugfs.h> | |
44 | #include <linux/seq_file.h> | |
45 | ||
9f77da9f | 46 | #define RCU_TREE_NONCORE |
6258c4fb IM |
47 | #include "rcutree.h" |
48 | ||
a46e0899 PM |
49 | #ifdef CONFIG_RCU_BOOST |
50 | ||
d71df90e | 51 | DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status); |
15ba0ba8 | 52 | DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_cpu); |
5ece5bab | 53 | DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_loops); |
d71df90e PM |
54 | DECLARE_PER_CPU(char, rcu_cpu_has_work); |
55 | ||
56 | static char convert_kthread_status(unsigned int kthread_status) | |
57 | { | |
58 | if (kthread_status > RCU_KTHREAD_MAX) | |
59 | return '?'; | |
15ba0ba8 | 60 | return "SRWOY"[kthread_status]; |
d71df90e PM |
61 | } |
62 | ||
a46e0899 PM |
63 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
64 | ||
64db4cff PM |
65 | static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp) |
66 | { | |
67 | if (!rdp->beenonline) | |
68 | return; | |
20133cfc | 69 | seq_printf(m, "%3d%cc=%lu g=%lu pq=%d pqc=%lu qp=%d", |
64db4cff PM |
70 | rdp->cpu, |
71 | cpu_is_offline(rdp->cpu) ? '!' : ' ', | |
72 | rdp->completed, rdp->gpnum, | |
73 | rdp->passed_quiesc, rdp->passed_quiesc_completed, | |
ef631b0c | 74 | rdp->qs_pending); |
64db4cff | 75 | #ifdef CONFIG_NO_HZ |
23b5c8fa PM |
76 | seq_printf(m, " dt=%d/%d/%d df=%lu", |
77 | atomic_read(&rdp->dynticks->dynticks), | |
64db4cff | 78 | rdp->dynticks->dynticks_nesting, |
23b5c8fa | 79 | rdp->dynticks->dynticks_nmi_nesting, |
64db4cff PM |
80 | rdp->dynticks_fqs); |
81 | #endif /* #ifdef CONFIG_NO_HZ */ | |
82 | seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi); | |
a46e0899 | 83 | seq_printf(m, " ql=%ld qs=%c%c%c%c", |
0ac3d136 PM |
84 | rdp->qlen, |
85 | ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] != | |
86 | rdp->nxttail[RCU_NEXT_TAIL]], | |
87 | ".R"[rdp->nxttail[RCU_WAIT_TAIL] != | |
88 | rdp->nxttail[RCU_NEXT_READY_TAIL]], | |
89 | ".W"[rdp->nxttail[RCU_DONE_TAIL] != | |
90 | rdp->nxttail[RCU_WAIT_TAIL]], | |
a46e0899 PM |
91 | ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]); |
92 | #ifdef CONFIG_RCU_BOOST | |
93 | seq_printf(m, " kt=%d/%c/%d ktl=%x", | |
d71df90e PM |
94 | per_cpu(rcu_cpu_has_work, rdp->cpu), |
95 | convert_kthread_status(per_cpu(rcu_cpu_kthread_status, | |
96 | rdp->cpu)), | |
15ba0ba8 | 97 | per_cpu(rcu_cpu_kthread_cpu, rdp->cpu), |
a46e0899 PM |
98 | per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff); |
99 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
100 | seq_printf(m, " b=%ld", rdp->blimit); | |
269dcc1c PM |
101 | seq_printf(m, " ci=%lu co=%lu ca=%lu\n", |
102 | rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted); | |
64db4cff PM |
103 | } |
104 | ||
105 | #define PRINT_RCU_DATA(name, func, m) \ | |
106 | do { \ | |
107 | int _p_r_d_i; \ | |
108 | \ | |
109 | for_each_possible_cpu(_p_r_d_i) \ | |
110 | func(m, &per_cpu(name, _p_r_d_i)); \ | |
111 | } while (0) | |
112 | ||
113 | static int show_rcudata(struct seq_file *m, void *unused) | |
114 | { | |
f41d911f PM |
115 | #ifdef CONFIG_TREE_PREEMPT_RCU |
116 | seq_puts(m, "rcu_preempt:\n"); | |
117 | PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data, m); | |
118 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
d6714c22 PM |
119 | seq_puts(m, "rcu_sched:\n"); |
120 | PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m); | |
64db4cff PM |
121 | seq_puts(m, "rcu_bh:\n"); |
122 | PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static int rcudata_open(struct inode *inode, struct file *file) | |
127 | { | |
128 | return single_open(file, show_rcudata, NULL); | |
129 | } | |
130 | ||
9b2619af | 131 | static const struct file_operations rcudata_fops = { |
64db4cff PM |
132 | .owner = THIS_MODULE, |
133 | .open = rcudata_open, | |
134 | .read = seq_read, | |
135 | .llseek = seq_lseek, | |
136 | .release = single_release, | |
137 | }; | |
138 | ||
139 | static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp) | |
140 | { | |
141 | if (!rdp->beenonline) | |
142 | return; | |
20133cfc | 143 | seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d", |
64db4cff | 144 | rdp->cpu, |
5699ed8f | 145 | cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"", |
64db4cff PM |
146 | rdp->completed, rdp->gpnum, |
147 | rdp->passed_quiesc, rdp->passed_quiesc_completed, | |
ef631b0c | 148 | rdp->qs_pending); |
64db4cff PM |
149 | #ifdef CONFIG_NO_HZ |
150 | seq_printf(m, ",%d,%d,%d,%lu", | |
23b5c8fa | 151 | atomic_read(&rdp->dynticks->dynticks), |
64db4cff | 152 | rdp->dynticks->dynticks_nesting, |
23b5c8fa | 153 | rdp->dynticks->dynticks_nmi_nesting, |
64db4cff PM |
154 | rdp->dynticks_fqs); |
155 | #endif /* #ifdef CONFIG_NO_HZ */ | |
156 | seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi); | |
a46e0899 | 157 | seq_printf(m, ",%ld,\"%c%c%c%c\"", rdp->qlen, |
0ac3d136 PM |
158 | ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] != |
159 | rdp->nxttail[RCU_NEXT_TAIL]], | |
160 | ".R"[rdp->nxttail[RCU_WAIT_TAIL] != | |
161 | rdp->nxttail[RCU_NEXT_READY_TAIL]], | |
162 | ".W"[rdp->nxttail[RCU_DONE_TAIL] != | |
163 | rdp->nxttail[RCU_WAIT_TAIL]], | |
a46e0899 PM |
164 | ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]); |
165 | #ifdef CONFIG_RCU_BOOST | |
166 | seq_printf(m, ",%d,\"%c\"", | |
d71df90e PM |
167 | per_cpu(rcu_cpu_has_work, rdp->cpu), |
168 | convert_kthread_status(per_cpu(rcu_cpu_kthread_status, | |
a46e0899 PM |
169 | rdp->cpu))); |
170 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
171 | seq_printf(m, ",%ld", rdp->blimit); | |
269dcc1c PM |
172 | seq_printf(m, ",%lu,%lu,%lu\n", |
173 | rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted); | |
64db4cff PM |
174 | } |
175 | ||
176 | static int show_rcudata_csv(struct seq_file *m, void *unused) | |
177 | { | |
ef631b0c | 178 | seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\","); |
64db4cff | 179 | #ifdef CONFIG_NO_HZ |
23b5c8fa | 180 | seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\","); |
64db4cff | 181 | #endif /* #ifdef CONFIG_NO_HZ */ |
a46e0899 PM |
182 | seq_puts(m, "\"of\",\"ri\",\"ql\",\"qs\""); |
183 | #ifdef CONFIG_RCU_BOOST | |
184 | seq_puts(m, "\"kt\",\"ktl\""); | |
185 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
186 | seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n"); | |
f41d911f PM |
187 | #ifdef CONFIG_TREE_PREEMPT_RCU |
188 | seq_puts(m, "\"rcu_preempt:\"\n"); | |
189 | PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m); | |
190 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
d6714c22 PM |
191 | seq_puts(m, "\"rcu_sched:\"\n"); |
192 | PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m); | |
64db4cff PM |
193 | seq_puts(m, "\"rcu_bh:\"\n"); |
194 | PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static int rcudata_csv_open(struct inode *inode, struct file *file) | |
199 | { | |
200 | return single_open(file, show_rcudata_csv, NULL); | |
201 | } | |
202 | ||
9b2619af | 203 | static const struct file_operations rcudata_csv_fops = { |
64db4cff PM |
204 | .owner = THIS_MODULE, |
205 | .open = rcudata_csv_open, | |
206 | .read = seq_read, | |
207 | .llseek = seq_lseek, | |
208 | .release = single_release, | |
209 | }; | |
210 | ||
0ea1f2eb PM |
211 | #ifdef CONFIG_RCU_BOOST |
212 | ||
213 | static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp) | |
214 | { | |
d71df90e | 215 | seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu " |
0ea1f2eb PM |
216 | "j=%04x bt=%04x\n", |
217 | rnp->grplo, rnp->grphi, | |
218 | "T."[list_empty(&rnp->blkd_tasks)], | |
219 | "N."[!rnp->gp_tasks], | |
220 | "E."[!rnp->exp_tasks], | |
221 | "B."[!rnp->boost_tasks], | |
d71df90e | 222 | convert_kthread_status(rnp->boost_kthread_status), |
0ea1f2eb PM |
223 | rnp->n_tasks_boosted, rnp->n_exp_boosts, |
224 | rnp->n_normal_boosts, | |
225 | (int)(jiffies & 0xffff), | |
226 | (int)(rnp->boost_time & 0xffff)); | |
227 | seq_printf(m, "%s: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n", | |
228 | " balk", | |
229 | rnp->n_balk_blkd_tasks, | |
230 | rnp->n_balk_exp_gp_tasks, | |
231 | rnp->n_balk_boost_tasks, | |
232 | rnp->n_balk_notblocked, | |
233 | rnp->n_balk_notyet, | |
234 | rnp->n_balk_nos); | |
235 | } | |
236 | ||
237 | static int show_rcu_node_boost(struct seq_file *m, void *unused) | |
238 | { | |
239 | struct rcu_node *rnp; | |
240 | ||
241 | rcu_for_each_leaf_node(&rcu_preempt_state, rnp) | |
242 | print_one_rcu_node_boost(m, rnp); | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static int rcu_node_boost_open(struct inode *inode, struct file *file) | |
247 | { | |
248 | return single_open(file, show_rcu_node_boost, NULL); | |
249 | } | |
250 | ||
251 | static const struct file_operations rcu_node_boost_fops = { | |
252 | .owner = THIS_MODULE, | |
253 | .open = rcu_node_boost_open, | |
254 | .read = seq_read, | |
255 | .llseek = seq_lseek, | |
256 | .release = single_release, | |
257 | }; | |
258 | ||
259 | /* | |
260 | * Create the rcuboost debugfs entry. Standard error return. | |
261 | */ | |
262 | static int rcu_boost_trace_create_file(struct dentry *rcudir) | |
263 | { | |
264 | return !debugfs_create_file("rcuboost", 0444, rcudir, NULL, | |
265 | &rcu_node_boost_fops); | |
266 | } | |
267 | ||
268 | #else /* #ifdef CONFIG_RCU_BOOST */ | |
269 | ||
270 | static int rcu_boost_trace_create_file(struct dentry *rcudir) | |
271 | { | |
272 | return 0; /* There cannot be an error if we didn't create it! */ | |
273 | } | |
274 | ||
275 | #endif /* #else #ifdef CONFIG_RCU_BOOST */ | |
276 | ||
64db4cff PM |
277 | static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp) |
278 | { | |
20133cfc | 279 | unsigned long gpnum; |
64db4cff PM |
280 | int level = 0; |
281 | struct rcu_node *rnp; | |
282 | ||
3397e040 | 283 | gpnum = rsp->gpnum; |
20133cfc | 284 | seq_printf(m, "c=%lu g=%lu s=%d jfq=%ld j=%x " |
29494be7 | 285 | "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n", |
3397e040 | 286 | rsp->completed, gpnum, rsp->signaled, |
64db4cff PM |
287 | (long)(rsp->jiffies_force_qs - jiffies), |
288 | (int)(jiffies & 0xffff), | |
289 | rsp->n_force_qs, rsp->n_force_qs_ngp, | |
290 | rsp->n_force_qs - rsp->n_force_qs_ngp, | |
29494be7 | 291 | rsp->n_force_qs_lh); |
64db4cff PM |
292 | for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) { |
293 | if (rnp->level != level) { | |
294 | seq_puts(m, "\n"); | |
295 | level = rnp->level; | |
296 | } | |
12f5f524 | 297 | seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ", |
64db4cff | 298 | rnp->qsmask, rnp->qsmaskinit, |
12f5f524 PM |
299 | ".G"[rnp->gp_tasks != NULL], |
300 | ".E"[rnp->exp_tasks != NULL], | |
301 | ".T"[!list_empty(&rnp->blkd_tasks)], | |
64db4cff PM |
302 | rnp->grplo, rnp->grphi, rnp->grpnum); |
303 | } | |
304 | seq_puts(m, "\n"); | |
305 | } | |
306 | ||
307 | static int show_rcuhier(struct seq_file *m, void *unused) | |
308 | { | |
f41d911f PM |
309 | #ifdef CONFIG_TREE_PREEMPT_RCU |
310 | seq_puts(m, "rcu_preempt:\n"); | |
311 | print_one_rcu_state(m, &rcu_preempt_state); | |
312 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
d6714c22 PM |
313 | seq_puts(m, "rcu_sched:\n"); |
314 | print_one_rcu_state(m, &rcu_sched_state); | |
64db4cff PM |
315 | seq_puts(m, "rcu_bh:\n"); |
316 | print_one_rcu_state(m, &rcu_bh_state); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static int rcuhier_open(struct inode *inode, struct file *file) | |
321 | { | |
322 | return single_open(file, show_rcuhier, NULL); | |
323 | } | |
324 | ||
9b2619af | 325 | static const struct file_operations rcuhier_fops = { |
64db4cff PM |
326 | .owner = THIS_MODULE, |
327 | .open = rcuhier_open, | |
328 | .read = seq_read, | |
329 | .llseek = seq_lseek, | |
330 | .release = single_release, | |
331 | }; | |
332 | ||
15ba0ba8 PM |
333 | static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp) |
334 | { | |
335 | unsigned long flags; | |
336 | unsigned long completed; | |
337 | unsigned long gpnum; | |
338 | unsigned long gpage; | |
339 | unsigned long gpmax; | |
340 | struct rcu_node *rnp = &rsp->node[0]; | |
341 | ||
342 | raw_spin_lock_irqsave(&rnp->lock, flags); | |
343 | completed = rsp->completed; | |
344 | gpnum = rsp->gpnum; | |
345 | if (rsp->completed == rsp->gpnum) | |
346 | gpage = 0; | |
347 | else | |
348 | gpage = jiffies - rsp->gp_start; | |
349 | gpmax = rsp->gp_max; | |
350 | raw_spin_unlock_irqrestore(&rnp->lock, flags); | |
351 | seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n", | |
352 | rsp->name, completed, gpnum, gpage, gpmax); | |
353 | } | |
354 | ||
64db4cff PM |
355 | static int show_rcugp(struct seq_file *m, void *unused) |
356 | { | |
f41d911f | 357 | #ifdef CONFIG_TREE_PREEMPT_RCU |
15ba0ba8 | 358 | show_one_rcugp(m, &rcu_preempt_state); |
f41d911f | 359 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
15ba0ba8 PM |
360 | show_one_rcugp(m, &rcu_sched_state); |
361 | show_one_rcugp(m, &rcu_bh_state); | |
64db4cff PM |
362 | return 0; |
363 | } | |
364 | ||
365 | static int rcugp_open(struct inode *inode, struct file *file) | |
366 | { | |
367 | return single_open(file, show_rcugp, NULL); | |
368 | } | |
369 | ||
9b2619af | 370 | static const struct file_operations rcugp_fops = { |
64db4cff PM |
371 | .owner = THIS_MODULE, |
372 | .open = rcugp_open, | |
373 | .read = seq_read, | |
374 | .llseek = seq_lseek, | |
375 | .release = single_release, | |
376 | }; | |
377 | ||
7ba5c840 PM |
378 | static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp) |
379 | { | |
380 | seq_printf(m, "%3d%cnp=%ld " | |
d21670ac PM |
381 | "qsp=%ld rpq=%ld cbr=%ld cng=%ld " |
382 | "gpc=%ld gps=%ld nf=%ld nn=%ld\n", | |
7ba5c840 PM |
383 | rdp->cpu, |
384 | cpu_is_offline(rdp->cpu) ? '!' : ' ', | |
385 | rdp->n_rcu_pending, | |
386 | rdp->n_rp_qs_pending, | |
d21670ac | 387 | rdp->n_rp_report_qs, |
7ba5c840 PM |
388 | rdp->n_rp_cb_ready, |
389 | rdp->n_rp_cpu_needs_gp, | |
390 | rdp->n_rp_gp_completed, | |
391 | rdp->n_rp_gp_started, | |
392 | rdp->n_rp_need_fqs, | |
393 | rdp->n_rp_need_nothing); | |
394 | } | |
395 | ||
396 | static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp) | |
397 | { | |
398 | int cpu; | |
399 | struct rcu_data *rdp; | |
400 | ||
401 | for_each_possible_cpu(cpu) { | |
394f99a9 | 402 | rdp = per_cpu_ptr(rsp->rda, cpu); |
7ba5c840 PM |
403 | if (rdp->beenonline) |
404 | print_one_rcu_pending(m, rdp); | |
405 | } | |
406 | } | |
407 | ||
408 | static int show_rcu_pending(struct seq_file *m, void *unused) | |
409 | { | |
f41d911f PM |
410 | #ifdef CONFIG_TREE_PREEMPT_RCU |
411 | seq_puts(m, "rcu_preempt:\n"); | |
412 | print_rcu_pendings(m, &rcu_preempt_state); | |
413 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
d6714c22 PM |
414 | seq_puts(m, "rcu_sched:\n"); |
415 | print_rcu_pendings(m, &rcu_sched_state); | |
7ba5c840 PM |
416 | seq_puts(m, "rcu_bh:\n"); |
417 | print_rcu_pendings(m, &rcu_bh_state); | |
418 | return 0; | |
419 | } | |
420 | ||
421 | static int rcu_pending_open(struct inode *inode, struct file *file) | |
422 | { | |
423 | return single_open(file, show_rcu_pending, NULL); | |
424 | } | |
425 | ||
9b2619af | 426 | static const struct file_operations rcu_pending_fops = { |
7ba5c840 PM |
427 | .owner = THIS_MODULE, |
428 | .open = rcu_pending_open, | |
429 | .read = seq_read, | |
430 | .llseek = seq_lseek, | |
431 | .release = single_release, | |
432 | }; | |
433 | ||
4a298656 PM |
434 | static int show_rcutorture(struct seq_file *m, void *unused) |
435 | { | |
436 | seq_printf(m, "rcutorture test sequence: %lu %s\n", | |
437 | rcutorture_testseq >> 1, | |
438 | (rcutorture_testseq & 0x1) ? "(test in progress)" : ""); | |
439 | seq_printf(m, "rcutorture update version number: %lu\n", | |
440 | rcutorture_vernum); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | static int rcutorture_open(struct inode *inode, struct file *file) | |
445 | { | |
446 | return single_open(file, show_rcutorture, NULL); | |
447 | } | |
448 | ||
449 | static const struct file_operations rcutorture_fops = { | |
450 | .owner = THIS_MODULE, | |
451 | .open = rcutorture_open, | |
452 | .read = seq_read, | |
453 | .llseek = seq_lseek, | |
454 | .release = single_release, | |
455 | }; | |
456 | ||
7ba5c840 | 457 | static struct dentry *rcudir; |
7ba5c840 | 458 | |
deb7a418 | 459 | static int __init rcutree_trace_init(void) |
64db4cff | 460 | { |
22f00b69 PM |
461 | struct dentry *retval; |
462 | ||
64db4cff PM |
463 | rcudir = debugfs_create_dir("rcu", NULL); |
464 | if (!rcudir) | |
22f00b69 | 465 | goto free_out; |
64db4cff | 466 | |
22f00b69 | 467 | retval = debugfs_create_file("rcudata", 0444, rcudir, |
64db4cff | 468 | NULL, &rcudata_fops); |
22f00b69 | 469 | if (!retval) |
64db4cff PM |
470 | goto free_out; |
471 | ||
22f00b69 | 472 | retval = debugfs_create_file("rcudata.csv", 0444, rcudir, |
64db4cff | 473 | NULL, &rcudata_csv_fops); |
22f00b69 | 474 | if (!retval) |
64db4cff PM |
475 | goto free_out; |
476 | ||
0ea1f2eb PM |
477 | if (rcu_boost_trace_create_file(rcudir)) |
478 | goto free_out; | |
479 | ||
22f00b69 PM |
480 | retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops); |
481 | if (!retval) | |
64db4cff PM |
482 | goto free_out; |
483 | ||
22f00b69 | 484 | retval = debugfs_create_file("rcuhier", 0444, rcudir, |
64db4cff | 485 | NULL, &rcuhier_fops); |
22f00b69 | 486 | if (!retval) |
64db4cff | 487 | goto free_out; |
7ba5c840 | 488 | |
22f00b69 | 489 | retval = debugfs_create_file("rcu_pending", 0444, rcudir, |
7ba5c840 | 490 | NULL, &rcu_pending_fops); |
22f00b69 | 491 | if (!retval) |
7ba5c840 | 492 | goto free_out; |
4a298656 PM |
493 | |
494 | retval = debugfs_create_file("rcutorture", 0444, rcudir, | |
495 | NULL, &rcutorture_fops); | |
496 | if (!retval) | |
497 | goto free_out; | |
64db4cff PM |
498 | return 0; |
499 | free_out: | |
22f00b69 | 500 | debugfs_remove_recursive(rcudir); |
64db4cff PM |
501 | return 1; |
502 | } | |
503 | ||
deb7a418 | 504 | static void __exit rcutree_trace_cleanup(void) |
64db4cff | 505 | { |
22f00b69 | 506 | debugfs_remove_recursive(rcudir); |
64db4cff PM |
507 | } |
508 | ||
509 | ||
deb7a418 PM |
510 | module_init(rcutree_trace_init); |
511 | module_exit(rcutree_trace_cleanup); | |
64db4cff PM |
512 | |
513 | MODULE_AUTHOR("Paul E. McKenney"); | |
514 | MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation"); | |
515 | MODULE_LICENSE("GPL"); |