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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> | |
60063497 | 34 | #include <linux/atomic.h> |
64db4cff PM |
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 PM |
51 | static char convert_kthread_status(unsigned int kthread_status) |
52 | { | |
53 | if (kthread_status > RCU_KTHREAD_MAX) | |
54 | return '?'; | |
15ba0ba8 | 55 | return "SRWOY"[kthread_status]; |
d71df90e PM |
56 | } |
57 | ||
a46e0899 PM |
58 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
59 | ||
64db4cff PM |
60 | static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp) |
61 | { | |
62 | if (!rdp->beenonline) | |
63 | return; | |
e4cc1f22 | 64 | seq_printf(m, "%3d%cc=%lu g=%lu pq=%d pgp=%lu qp=%d", |
64db4cff PM |
65 | rdp->cpu, |
66 | cpu_is_offline(rdp->cpu) ? '!' : ' ', | |
67 | rdp->completed, rdp->gpnum, | |
e4cc1f22 | 68 | rdp->passed_quiesce, rdp->passed_quiesce_gpnum, |
ef631b0c | 69 | rdp->qs_pending); |
64db4cff | 70 | #ifdef CONFIG_NO_HZ |
23b5c8fa PM |
71 | seq_printf(m, " dt=%d/%d/%d df=%lu", |
72 | atomic_read(&rdp->dynticks->dynticks), | |
64db4cff | 73 | rdp->dynticks->dynticks_nesting, |
23b5c8fa | 74 | rdp->dynticks->dynticks_nmi_nesting, |
64db4cff PM |
75 | rdp->dynticks_fqs); |
76 | #endif /* #ifdef CONFIG_NO_HZ */ | |
77 | seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi); | |
a46e0899 | 78 | seq_printf(m, " ql=%ld qs=%c%c%c%c", |
0ac3d136 PM |
79 | rdp->qlen, |
80 | ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] != | |
81 | rdp->nxttail[RCU_NEXT_TAIL]], | |
82 | ".R"[rdp->nxttail[RCU_WAIT_TAIL] != | |
83 | rdp->nxttail[RCU_NEXT_READY_TAIL]], | |
84 | ".W"[rdp->nxttail[RCU_DONE_TAIL] != | |
85 | rdp->nxttail[RCU_WAIT_TAIL]], | |
a46e0899 PM |
86 | ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]); |
87 | #ifdef CONFIG_RCU_BOOST | |
88 | seq_printf(m, " kt=%d/%c/%d ktl=%x", | |
d71df90e PM |
89 | per_cpu(rcu_cpu_has_work, rdp->cpu), |
90 | convert_kthread_status(per_cpu(rcu_cpu_kthread_status, | |
91 | rdp->cpu)), | |
15ba0ba8 | 92 | per_cpu(rcu_cpu_kthread_cpu, rdp->cpu), |
a46e0899 PM |
93 | per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff); |
94 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
95 | seq_printf(m, " b=%ld", rdp->blimit); | |
269dcc1c PM |
96 | seq_printf(m, " ci=%lu co=%lu ca=%lu\n", |
97 | rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted); | |
64db4cff PM |
98 | } |
99 | ||
100 | #define PRINT_RCU_DATA(name, func, m) \ | |
101 | do { \ | |
102 | int _p_r_d_i; \ | |
103 | \ | |
104 | for_each_possible_cpu(_p_r_d_i) \ | |
105 | func(m, &per_cpu(name, _p_r_d_i)); \ | |
106 | } while (0) | |
107 | ||
108 | static int show_rcudata(struct seq_file *m, void *unused) | |
109 | { | |
f41d911f PM |
110 | #ifdef CONFIG_TREE_PREEMPT_RCU |
111 | seq_puts(m, "rcu_preempt:\n"); | |
112 | PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data, m); | |
113 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
d6714c22 PM |
114 | seq_puts(m, "rcu_sched:\n"); |
115 | PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m); | |
64db4cff PM |
116 | seq_puts(m, "rcu_bh:\n"); |
117 | PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static int rcudata_open(struct inode *inode, struct file *file) | |
122 | { | |
123 | return single_open(file, show_rcudata, NULL); | |
124 | } | |
125 | ||
9b2619af | 126 | static const struct file_operations rcudata_fops = { |
64db4cff PM |
127 | .owner = THIS_MODULE, |
128 | .open = rcudata_open, | |
129 | .read = seq_read, | |
130 | .llseek = seq_lseek, | |
131 | .release = single_release, | |
132 | }; | |
133 | ||
134 | static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp) | |
135 | { | |
136 | if (!rdp->beenonline) | |
137 | return; | |
20133cfc | 138 | seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d", |
64db4cff | 139 | rdp->cpu, |
5699ed8f | 140 | cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"", |
64db4cff | 141 | rdp->completed, rdp->gpnum, |
e4cc1f22 | 142 | rdp->passed_quiesce, rdp->passed_quiesce_gpnum, |
ef631b0c | 143 | rdp->qs_pending); |
64db4cff PM |
144 | #ifdef CONFIG_NO_HZ |
145 | seq_printf(m, ",%d,%d,%d,%lu", | |
23b5c8fa | 146 | atomic_read(&rdp->dynticks->dynticks), |
64db4cff | 147 | rdp->dynticks->dynticks_nesting, |
23b5c8fa | 148 | rdp->dynticks->dynticks_nmi_nesting, |
64db4cff PM |
149 | rdp->dynticks_fqs); |
150 | #endif /* #ifdef CONFIG_NO_HZ */ | |
151 | seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi); | |
a46e0899 | 152 | seq_printf(m, ",%ld,\"%c%c%c%c\"", rdp->qlen, |
0ac3d136 PM |
153 | ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] != |
154 | rdp->nxttail[RCU_NEXT_TAIL]], | |
155 | ".R"[rdp->nxttail[RCU_WAIT_TAIL] != | |
156 | rdp->nxttail[RCU_NEXT_READY_TAIL]], | |
157 | ".W"[rdp->nxttail[RCU_DONE_TAIL] != | |
158 | rdp->nxttail[RCU_WAIT_TAIL]], | |
a46e0899 PM |
159 | ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]); |
160 | #ifdef CONFIG_RCU_BOOST | |
161 | seq_printf(m, ",%d,\"%c\"", | |
d71df90e PM |
162 | per_cpu(rcu_cpu_has_work, rdp->cpu), |
163 | convert_kthread_status(per_cpu(rcu_cpu_kthread_status, | |
a46e0899 PM |
164 | rdp->cpu))); |
165 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
166 | seq_printf(m, ",%ld", rdp->blimit); | |
269dcc1c PM |
167 | seq_printf(m, ",%lu,%lu,%lu\n", |
168 | rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted); | |
64db4cff PM |
169 | } |
170 | ||
171 | static int show_rcudata_csv(struct seq_file *m, void *unused) | |
172 | { | |
e4cc1f22 | 173 | seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pgp\",\"pq\","); |
64db4cff | 174 | #ifdef CONFIG_NO_HZ |
23b5c8fa | 175 | seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\","); |
64db4cff | 176 | #endif /* #ifdef CONFIG_NO_HZ */ |
a46e0899 PM |
177 | seq_puts(m, "\"of\",\"ri\",\"ql\",\"qs\""); |
178 | #ifdef CONFIG_RCU_BOOST | |
179 | seq_puts(m, "\"kt\",\"ktl\""); | |
180 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
181 | seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n"); | |
f41d911f PM |
182 | #ifdef CONFIG_TREE_PREEMPT_RCU |
183 | seq_puts(m, "\"rcu_preempt:\"\n"); | |
184 | PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m); | |
185 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
d6714c22 PM |
186 | seq_puts(m, "\"rcu_sched:\"\n"); |
187 | PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m); | |
64db4cff PM |
188 | seq_puts(m, "\"rcu_bh:\"\n"); |
189 | PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int rcudata_csv_open(struct inode *inode, struct file *file) | |
194 | { | |
195 | return single_open(file, show_rcudata_csv, NULL); | |
196 | } | |
197 | ||
9b2619af | 198 | static const struct file_operations rcudata_csv_fops = { |
64db4cff PM |
199 | .owner = THIS_MODULE, |
200 | .open = rcudata_csv_open, | |
201 | .read = seq_read, | |
202 | .llseek = seq_lseek, | |
203 | .release = single_release, | |
204 | }; | |
205 | ||
0ea1f2eb PM |
206 | #ifdef CONFIG_RCU_BOOST |
207 | ||
208 | static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp) | |
209 | { | |
d71df90e | 210 | seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu " |
0ea1f2eb PM |
211 | "j=%04x bt=%04x\n", |
212 | rnp->grplo, rnp->grphi, | |
213 | "T."[list_empty(&rnp->blkd_tasks)], | |
214 | "N."[!rnp->gp_tasks], | |
215 | "E."[!rnp->exp_tasks], | |
216 | "B."[!rnp->boost_tasks], | |
d71df90e | 217 | convert_kthread_status(rnp->boost_kthread_status), |
0ea1f2eb PM |
218 | rnp->n_tasks_boosted, rnp->n_exp_boosts, |
219 | rnp->n_normal_boosts, | |
220 | (int)(jiffies & 0xffff), | |
221 | (int)(rnp->boost_time & 0xffff)); | |
222 | seq_printf(m, "%s: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n", | |
223 | " balk", | |
224 | rnp->n_balk_blkd_tasks, | |
225 | rnp->n_balk_exp_gp_tasks, | |
226 | rnp->n_balk_boost_tasks, | |
227 | rnp->n_balk_notblocked, | |
228 | rnp->n_balk_notyet, | |
229 | rnp->n_balk_nos); | |
230 | } | |
231 | ||
232 | static int show_rcu_node_boost(struct seq_file *m, void *unused) | |
233 | { | |
234 | struct rcu_node *rnp; | |
235 | ||
236 | rcu_for_each_leaf_node(&rcu_preempt_state, rnp) | |
237 | print_one_rcu_node_boost(m, rnp); | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static int rcu_node_boost_open(struct inode *inode, struct file *file) | |
242 | { | |
243 | return single_open(file, show_rcu_node_boost, NULL); | |
244 | } | |
245 | ||
246 | static const struct file_operations rcu_node_boost_fops = { | |
247 | .owner = THIS_MODULE, | |
248 | .open = rcu_node_boost_open, | |
249 | .read = seq_read, | |
250 | .llseek = seq_lseek, | |
251 | .release = single_release, | |
252 | }; | |
253 | ||
254 | /* | |
255 | * Create the rcuboost debugfs entry. Standard error return. | |
256 | */ | |
257 | static int rcu_boost_trace_create_file(struct dentry *rcudir) | |
258 | { | |
259 | return !debugfs_create_file("rcuboost", 0444, rcudir, NULL, | |
260 | &rcu_node_boost_fops); | |
261 | } | |
262 | ||
263 | #else /* #ifdef CONFIG_RCU_BOOST */ | |
264 | ||
265 | static int rcu_boost_trace_create_file(struct dentry *rcudir) | |
266 | { | |
267 | return 0; /* There cannot be an error if we didn't create it! */ | |
268 | } | |
269 | ||
270 | #endif /* #else #ifdef CONFIG_RCU_BOOST */ | |
271 | ||
64db4cff PM |
272 | static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp) |
273 | { | |
20133cfc | 274 | unsigned long gpnum; |
64db4cff PM |
275 | int level = 0; |
276 | struct rcu_node *rnp; | |
277 | ||
3397e040 | 278 | gpnum = rsp->gpnum; |
20133cfc | 279 | seq_printf(m, "c=%lu g=%lu s=%d jfq=%ld j=%x " |
29494be7 | 280 | "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n", |
3397e040 | 281 | rsp->completed, gpnum, rsp->signaled, |
64db4cff PM |
282 | (long)(rsp->jiffies_force_qs - jiffies), |
283 | (int)(jiffies & 0xffff), | |
284 | rsp->n_force_qs, rsp->n_force_qs_ngp, | |
285 | rsp->n_force_qs - rsp->n_force_qs_ngp, | |
29494be7 | 286 | rsp->n_force_qs_lh); |
64db4cff PM |
287 | for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) { |
288 | if (rnp->level != level) { | |
289 | seq_puts(m, "\n"); | |
290 | level = rnp->level; | |
291 | } | |
12f5f524 | 292 | seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ", |
64db4cff | 293 | rnp->qsmask, rnp->qsmaskinit, |
12f5f524 PM |
294 | ".G"[rnp->gp_tasks != NULL], |
295 | ".E"[rnp->exp_tasks != NULL], | |
296 | ".T"[!list_empty(&rnp->blkd_tasks)], | |
64db4cff PM |
297 | rnp->grplo, rnp->grphi, rnp->grpnum); |
298 | } | |
299 | seq_puts(m, "\n"); | |
300 | } | |
301 | ||
302 | static int show_rcuhier(struct seq_file *m, void *unused) | |
303 | { | |
f41d911f PM |
304 | #ifdef CONFIG_TREE_PREEMPT_RCU |
305 | seq_puts(m, "rcu_preempt:\n"); | |
306 | print_one_rcu_state(m, &rcu_preempt_state); | |
307 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
d6714c22 PM |
308 | seq_puts(m, "rcu_sched:\n"); |
309 | print_one_rcu_state(m, &rcu_sched_state); | |
64db4cff PM |
310 | seq_puts(m, "rcu_bh:\n"); |
311 | print_one_rcu_state(m, &rcu_bh_state); | |
312 | return 0; | |
313 | } | |
314 | ||
315 | static int rcuhier_open(struct inode *inode, struct file *file) | |
316 | { | |
317 | return single_open(file, show_rcuhier, NULL); | |
318 | } | |
319 | ||
9b2619af | 320 | static const struct file_operations rcuhier_fops = { |
64db4cff PM |
321 | .owner = THIS_MODULE, |
322 | .open = rcuhier_open, | |
323 | .read = seq_read, | |
324 | .llseek = seq_lseek, | |
325 | .release = single_release, | |
326 | }; | |
327 | ||
15ba0ba8 PM |
328 | static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp) |
329 | { | |
330 | unsigned long flags; | |
331 | unsigned long completed; | |
332 | unsigned long gpnum; | |
333 | unsigned long gpage; | |
334 | unsigned long gpmax; | |
335 | struct rcu_node *rnp = &rsp->node[0]; | |
336 | ||
337 | raw_spin_lock_irqsave(&rnp->lock, flags); | |
338 | completed = rsp->completed; | |
339 | gpnum = rsp->gpnum; | |
340 | if (rsp->completed == rsp->gpnum) | |
341 | gpage = 0; | |
342 | else | |
343 | gpage = jiffies - rsp->gp_start; | |
344 | gpmax = rsp->gp_max; | |
345 | raw_spin_unlock_irqrestore(&rnp->lock, flags); | |
346 | seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n", | |
347 | rsp->name, completed, gpnum, gpage, gpmax); | |
348 | } | |
349 | ||
64db4cff PM |
350 | static int show_rcugp(struct seq_file *m, void *unused) |
351 | { | |
f41d911f | 352 | #ifdef CONFIG_TREE_PREEMPT_RCU |
15ba0ba8 | 353 | show_one_rcugp(m, &rcu_preempt_state); |
f41d911f | 354 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
15ba0ba8 PM |
355 | show_one_rcugp(m, &rcu_sched_state); |
356 | show_one_rcugp(m, &rcu_bh_state); | |
64db4cff PM |
357 | return 0; |
358 | } | |
359 | ||
360 | static int rcugp_open(struct inode *inode, struct file *file) | |
361 | { | |
362 | return single_open(file, show_rcugp, NULL); | |
363 | } | |
364 | ||
9b2619af | 365 | static const struct file_operations rcugp_fops = { |
64db4cff PM |
366 | .owner = THIS_MODULE, |
367 | .open = rcugp_open, | |
368 | .read = seq_read, | |
369 | .llseek = seq_lseek, | |
370 | .release = single_release, | |
371 | }; | |
372 | ||
7ba5c840 PM |
373 | static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp) |
374 | { | |
375 | seq_printf(m, "%3d%cnp=%ld " | |
d21670ac PM |
376 | "qsp=%ld rpq=%ld cbr=%ld cng=%ld " |
377 | "gpc=%ld gps=%ld nf=%ld nn=%ld\n", | |
7ba5c840 PM |
378 | rdp->cpu, |
379 | cpu_is_offline(rdp->cpu) ? '!' : ' ', | |
380 | rdp->n_rcu_pending, | |
381 | rdp->n_rp_qs_pending, | |
d21670ac | 382 | rdp->n_rp_report_qs, |
7ba5c840 PM |
383 | rdp->n_rp_cb_ready, |
384 | rdp->n_rp_cpu_needs_gp, | |
385 | rdp->n_rp_gp_completed, | |
386 | rdp->n_rp_gp_started, | |
387 | rdp->n_rp_need_fqs, | |
388 | rdp->n_rp_need_nothing); | |
389 | } | |
390 | ||
391 | static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp) | |
392 | { | |
393 | int cpu; | |
394 | struct rcu_data *rdp; | |
395 | ||
396 | for_each_possible_cpu(cpu) { | |
394f99a9 | 397 | rdp = per_cpu_ptr(rsp->rda, cpu); |
7ba5c840 PM |
398 | if (rdp->beenonline) |
399 | print_one_rcu_pending(m, rdp); | |
400 | } | |
401 | } | |
402 | ||
403 | static int show_rcu_pending(struct seq_file *m, void *unused) | |
404 | { | |
f41d911f PM |
405 | #ifdef CONFIG_TREE_PREEMPT_RCU |
406 | seq_puts(m, "rcu_preempt:\n"); | |
407 | print_rcu_pendings(m, &rcu_preempt_state); | |
408 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ | |
d6714c22 PM |
409 | seq_puts(m, "rcu_sched:\n"); |
410 | print_rcu_pendings(m, &rcu_sched_state); | |
7ba5c840 PM |
411 | seq_puts(m, "rcu_bh:\n"); |
412 | print_rcu_pendings(m, &rcu_bh_state); | |
413 | return 0; | |
414 | } | |
415 | ||
416 | static int rcu_pending_open(struct inode *inode, struct file *file) | |
417 | { | |
418 | return single_open(file, show_rcu_pending, NULL); | |
419 | } | |
420 | ||
9b2619af | 421 | static const struct file_operations rcu_pending_fops = { |
7ba5c840 PM |
422 | .owner = THIS_MODULE, |
423 | .open = rcu_pending_open, | |
424 | .read = seq_read, | |
425 | .llseek = seq_lseek, | |
426 | .release = single_release, | |
427 | }; | |
428 | ||
4a298656 PM |
429 | static int show_rcutorture(struct seq_file *m, void *unused) |
430 | { | |
431 | seq_printf(m, "rcutorture test sequence: %lu %s\n", | |
432 | rcutorture_testseq >> 1, | |
433 | (rcutorture_testseq & 0x1) ? "(test in progress)" : ""); | |
434 | seq_printf(m, "rcutorture update version number: %lu\n", | |
435 | rcutorture_vernum); | |
436 | return 0; | |
437 | } | |
438 | ||
439 | static int rcutorture_open(struct inode *inode, struct file *file) | |
440 | { | |
441 | return single_open(file, show_rcutorture, NULL); | |
442 | } | |
443 | ||
444 | static const struct file_operations rcutorture_fops = { | |
445 | .owner = THIS_MODULE, | |
446 | .open = rcutorture_open, | |
447 | .read = seq_read, | |
448 | .llseek = seq_lseek, | |
449 | .release = single_release, | |
450 | }; | |
451 | ||
7ba5c840 | 452 | static struct dentry *rcudir; |
7ba5c840 | 453 | |
deb7a418 | 454 | static int __init rcutree_trace_init(void) |
64db4cff | 455 | { |
22f00b69 PM |
456 | struct dentry *retval; |
457 | ||
64db4cff PM |
458 | rcudir = debugfs_create_dir("rcu", NULL); |
459 | if (!rcudir) | |
22f00b69 | 460 | goto free_out; |
64db4cff | 461 | |
22f00b69 | 462 | retval = debugfs_create_file("rcudata", 0444, rcudir, |
64db4cff | 463 | NULL, &rcudata_fops); |
22f00b69 | 464 | if (!retval) |
64db4cff PM |
465 | goto free_out; |
466 | ||
22f00b69 | 467 | retval = debugfs_create_file("rcudata.csv", 0444, rcudir, |
64db4cff | 468 | NULL, &rcudata_csv_fops); |
22f00b69 | 469 | if (!retval) |
64db4cff PM |
470 | goto free_out; |
471 | ||
0ea1f2eb PM |
472 | if (rcu_boost_trace_create_file(rcudir)) |
473 | goto free_out; | |
474 | ||
22f00b69 PM |
475 | retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops); |
476 | if (!retval) | |
64db4cff PM |
477 | goto free_out; |
478 | ||
22f00b69 | 479 | retval = debugfs_create_file("rcuhier", 0444, rcudir, |
64db4cff | 480 | NULL, &rcuhier_fops); |
22f00b69 | 481 | if (!retval) |
64db4cff | 482 | goto free_out; |
7ba5c840 | 483 | |
22f00b69 | 484 | retval = debugfs_create_file("rcu_pending", 0444, rcudir, |
7ba5c840 | 485 | NULL, &rcu_pending_fops); |
22f00b69 | 486 | if (!retval) |
7ba5c840 | 487 | goto free_out; |
4a298656 PM |
488 | |
489 | retval = debugfs_create_file("rcutorture", 0444, rcudir, | |
490 | NULL, &rcutorture_fops); | |
491 | if (!retval) | |
492 | goto free_out; | |
64db4cff PM |
493 | return 0; |
494 | free_out: | |
22f00b69 | 495 | debugfs_remove_recursive(rcudir); |
64db4cff PM |
496 | return 1; |
497 | } | |
498 | ||
deb7a418 | 499 | static void __exit rcutree_trace_cleanup(void) |
64db4cff | 500 | { |
22f00b69 | 501 | debugfs_remove_recursive(rcudir); |
64db4cff PM |
502 | } |
503 | ||
504 | ||
deb7a418 PM |
505 | module_init(rcutree_trace_init); |
506 | module_exit(rcutree_trace_cleanup); | |
64db4cff PM |
507 | |
508 | MODULE_AUTHOR("Paul E. McKenney"); | |
509 | MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation"); | |
510 | MODULE_LICENSE("GPL"); |