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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a8f24a39 IM |
2 | /* |
3 | * kernel/lockdep_proc.c | |
4 | * | |
5 | * Runtime locking correctness validator | |
6 | * | |
7 | * Started by Ingo Molnar: | |
8 | * | |
4b32d0a4 | 9 | * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> |
90eec103 | 10 | * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra |
a8f24a39 IM |
11 | * |
12 | * Code for /proc/lockdep and /proc/lockdep_stats: | |
13 | * | |
14 | */ | |
9984de1a | 15 | #include <linux/export.h> |
a8f24a39 IM |
16 | #include <linux/proc_fs.h> |
17 | #include <linux/seq_file.h> | |
18 | #include <linux/kallsyms.h> | |
19 | #include <linux/debug_locks.h> | |
c46261de PZ |
20 | #include <linux/vmalloc.h> |
21 | #include <linux/sort.h> | |
7c0f6ba6 | 22 | #include <linux/uaccess.h> |
c46261de | 23 | #include <asm/div64.h> |
a8f24a39 IM |
24 | |
25 | #include "lockdep_internals.h" | |
26 | ||
27 | static void *l_next(struct seq_file *m, void *v, loff_t *pos) | |
28 | { | |
8109e1de | 29 | return seq_list_next(v, &all_lock_classes, pos); |
a8f24a39 IM |
30 | } |
31 | ||
32 | static void *l_start(struct seq_file *m, loff_t *pos) | |
33 | { | |
8109e1de | 34 | return seq_list_start_head(&all_lock_classes, *pos); |
a8f24a39 IM |
35 | } |
36 | ||
37 | static void l_stop(struct seq_file *m, void *v) | |
38 | { | |
39 | } | |
40 | ||
068135e6 JB |
41 | static void print_name(struct seq_file *m, struct lock_class *class) |
42 | { | |
99fb4a12 | 43 | char str[KSYM_NAME_LEN]; |
068135e6 JB |
44 | const char *name = class->name; |
45 | ||
46 | if (!name) { | |
47 | name = __get_key_name(class->key, str); | |
48 | seq_printf(m, "%s", name); | |
49 | } else{ | |
50 | seq_printf(m, "%s", name); | |
51 | if (class->name_version > 1) | |
52 | seq_printf(m, "#%d", class->name_version); | |
53 | if (class->subclass) | |
54 | seq_printf(m, "/%d", class->subclass); | |
55 | } | |
56 | } | |
57 | ||
a8f24a39 IM |
58 | static int l_show(struct seq_file *m, void *v) |
59 | { | |
8109e1de | 60 | struct lock_class *class = list_entry(v, struct lock_class, lock_entry); |
068135e6 | 61 | struct lock_list *entry; |
f510b233 | 62 | char usage[LOCK_USAGE_CHARS]; |
a8f24a39 | 63 | |
8109e1de | 64 | if (v == &all_lock_classes) { |
94c61c0a TP |
65 | seq_printf(m, "all lock classes:\n"); |
66 | return 0; | |
67 | } | |
68 | ||
a8f24a39 IM |
69 | seq_printf(m, "%p", class->key); |
70 | #ifdef CONFIG_DEBUG_LOCKDEP | |
8ca2b56c | 71 | seq_printf(m, " OPS:%8ld", debug_class_ops_read(class)); |
a8f24a39 | 72 | #endif |
df60a844 SH |
73 | #ifdef CONFIG_PROVE_LOCKING |
74 | seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class)); | |
75 | seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class)); | |
76 | #endif | |
a8f24a39 | 77 | |
f510b233 PZ |
78 | get_usage_chars(class, usage); |
79 | seq_printf(m, " %s", usage); | |
a8f24a39 | 80 | |
068135e6 JB |
81 | seq_printf(m, ": "); |
82 | print_name(m, class); | |
83 | seq_puts(m, "\n"); | |
84 | ||
85 | list_for_each_entry(entry, &class->locks_after, entry) { | |
86 | if (entry->distance == 1) { | |
2429e4ee | 87 | seq_printf(m, " -> [%p] ", entry->class->key); |
068135e6 JB |
88 | print_name(m, entry->class); |
89 | seq_puts(m, "\n"); | |
90 | } | |
a8f24a39 IM |
91 | } |
92 | seq_puts(m, "\n"); | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
15ad7cdc | 97 | static const struct seq_operations lockdep_ops = { |
a8f24a39 IM |
98 | .start = l_start, |
99 | .next = l_next, | |
100 | .stop = l_stop, | |
101 | .show = l_show, | |
102 | }; | |
103 | ||
cd1a28e8 | 104 | #ifdef CONFIG_PROVE_LOCKING |
443cd507 HY |
105 | static void *lc_start(struct seq_file *m, loff_t *pos) |
106 | { | |
2212684a BVA |
107 | if (*pos < 0) |
108 | return NULL; | |
109 | ||
443cd507 HY |
110 | if (*pos == 0) |
111 | return SEQ_START_TOKEN; | |
112 | ||
2212684a | 113 | return lock_chains + (*pos - 1); |
443cd507 HY |
114 | } |
115 | ||
12aac19d LZ |
116 | static void *lc_next(struct seq_file *m, void *v, loff_t *pos) |
117 | { | |
2212684a | 118 | *pos = lockdep_next_lockchain(*pos - 1) + 1; |
12aac19d LZ |
119 | return lc_start(m, pos); |
120 | } | |
121 | ||
443cd507 HY |
122 | static void lc_stop(struct seq_file *m, void *v) |
123 | { | |
124 | } | |
125 | ||
126 | static int lc_show(struct seq_file *m, void *v) | |
127 | { | |
128 | struct lock_chain *chain = v; | |
129 | struct lock_class *class; | |
130 | int i; | |
131 | ||
132 | if (v == SEQ_START_TOKEN) { | |
75dd602a PZ |
133 | if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS) |
134 | seq_printf(m, "(buggered) "); | |
443cd507 HY |
135 | seq_printf(m, "all lock chains:\n"); |
136 | return 0; | |
137 | } | |
138 | ||
139 | seq_printf(m, "irq_context: %d\n", chain->irq_context); | |
140 | ||
141 | for (i = 0; i < chain->depth; i++) { | |
142 | class = lock_chain_get_class(chain, i); | |
8bfe0298 RV |
143 | if (!class->key) |
144 | continue; | |
145 | ||
443cd507 HY |
146 | seq_printf(m, "[%p] ", class->key); |
147 | print_name(m, class); | |
148 | seq_puts(m, "\n"); | |
149 | } | |
150 | seq_puts(m, "\n"); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static const struct seq_operations lockdep_chains_ops = { | |
156 | .start = lc_start, | |
157 | .next = lc_next, | |
158 | .stop = lc_stop, | |
159 | .show = lc_show, | |
160 | }; | |
cd1a28e8 | 161 | #endif /* CONFIG_PROVE_LOCKING */ |
443cd507 | 162 | |
a8f24a39 IM |
163 | static void lockdep_stats_debug_show(struct seq_file *m) |
164 | { | |
165 | #ifdef CONFIG_DEBUG_LOCKDEP | |
bd6d29c2 FW |
166 | unsigned long long hi1 = debug_atomic_read(hardirqs_on_events), |
167 | hi2 = debug_atomic_read(hardirqs_off_events), | |
168 | hr1 = debug_atomic_read(redundant_hardirqs_on), | |
169 | hr2 = debug_atomic_read(redundant_hardirqs_off), | |
170 | si1 = debug_atomic_read(softirqs_on_events), | |
171 | si2 = debug_atomic_read(softirqs_off_events), | |
172 | sr1 = debug_atomic_read(redundant_softirqs_on), | |
173 | sr2 = debug_atomic_read(redundant_softirqs_off); | |
174 | ||
175 | seq_printf(m, " chain lookup misses: %11llu\n", | |
176 | debug_atomic_read(chain_lookup_misses)); | |
177 | seq_printf(m, " chain lookup hits: %11llu\n", | |
178 | debug_atomic_read(chain_lookup_hits)); | |
179 | seq_printf(m, " cyclic checks: %11llu\n", | |
180 | debug_atomic_read(nr_cyclic_checks)); | |
ae813308 PZ |
181 | seq_printf(m, " redundant checks: %11llu\n", |
182 | debug_atomic_read(nr_redundant_checks)); | |
183 | seq_printf(m, " redundant links: %11llu\n", | |
184 | debug_atomic_read(nr_redundant)); | |
bd6d29c2 FW |
185 | seq_printf(m, " find-mask forwards checks: %11llu\n", |
186 | debug_atomic_read(nr_find_usage_forwards_checks)); | |
187 | seq_printf(m, " find-mask backwards checks: %11llu\n", | |
188 | debug_atomic_read(nr_find_usage_backwards_checks)); | |
189 | ||
190 | seq_printf(m, " hardirq on events: %11llu\n", hi1); | |
191 | seq_printf(m, " hardirq off events: %11llu\n", hi2); | |
192 | seq_printf(m, " redundant hardirq ons: %11llu\n", hr1); | |
193 | seq_printf(m, " redundant hardirq offs: %11llu\n", hr2); | |
194 | seq_printf(m, " softirq on events: %11llu\n", si1); | |
195 | seq_printf(m, " softirq off events: %11llu\n", si2); | |
196 | seq_printf(m, " redundant softirq ons: %11llu\n", sr1); | |
197 | seq_printf(m, " redundant softirq offs: %11llu\n", sr2); | |
a8f24a39 IM |
198 | #endif |
199 | } | |
200 | ||
201 | static int lockdep_stats_show(struct seq_file *m, void *v) | |
202 | { | |
203 | struct lock_class *class; | |
204 | unsigned long nr_unused = 0, nr_uncategorized = 0, | |
205 | nr_irq_safe = 0, nr_irq_unsafe = 0, | |
206 | nr_softirq_safe = 0, nr_softirq_unsafe = 0, | |
207 | nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, | |
208 | nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, | |
209 | nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, | |
210 | nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, | |
dec29608 | 211 | sum_forward_deps = 0; |
a8f24a39 IM |
212 | |
213 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
214 | ||
215 | if (class->usage_mask == 0) | |
216 | nr_unused++; | |
217 | if (class->usage_mask == LOCKF_USED) | |
218 | nr_uncategorized++; | |
219 | if (class->usage_mask & LOCKF_USED_IN_IRQ) | |
220 | nr_irq_safe++; | |
4fc95e86 | 221 | if (class->usage_mask & LOCKF_ENABLED_IRQ) |
a8f24a39 IM |
222 | nr_irq_unsafe++; |
223 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) | |
224 | nr_softirq_safe++; | |
4fc95e86 | 225 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ) |
a8f24a39 IM |
226 | nr_softirq_unsafe++; |
227 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) | |
228 | nr_hardirq_safe++; | |
4fc95e86 | 229 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ) |
a8f24a39 IM |
230 | nr_hardirq_unsafe++; |
231 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) | |
232 | nr_irq_read_safe++; | |
4fc95e86 | 233 | if (class->usage_mask & LOCKF_ENABLED_IRQ_READ) |
a8f24a39 IM |
234 | nr_irq_read_unsafe++; |
235 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) | |
236 | nr_softirq_read_safe++; | |
4fc95e86 | 237 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ) |
a8f24a39 IM |
238 | nr_softirq_read_unsafe++; |
239 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) | |
240 | nr_hardirq_read_safe++; | |
4fc95e86 | 241 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ) |
a8f24a39 IM |
242 | nr_hardirq_read_unsafe++; |
243 | ||
df60a844 | 244 | #ifdef CONFIG_PROVE_LOCKING |
419ca3f1 | 245 | sum_forward_deps += lockdep_count_forward_deps(class); |
df60a844 | 246 | #endif |
a8f24a39 | 247 | } |
501b9ebf | 248 | #ifdef CONFIG_DEBUG_LOCKDEP |
bd6d29c2 | 249 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused); |
a8f24a39 IM |
250 | #endif |
251 | seq_printf(m, " lock-classes: %11lu [max: %lu]\n", | |
252 | nr_lock_classes, MAX_LOCKDEP_KEYS); | |
253 | seq_printf(m, " direct dependencies: %11lu [max: %lu]\n", | |
254 | nr_list_entries, MAX_LOCKDEP_ENTRIES); | |
255 | seq_printf(m, " indirect dependencies: %11lu\n", | |
256 | sum_forward_deps); | |
257 | ||
258 | /* | |
259 | * Total number of dependencies: | |
260 | * | |
261 | * All irq-safe locks may nest inside irq-unsafe locks, | |
262 | * plus all the other known dependencies: | |
263 | */ | |
264 | seq_printf(m, " all direct dependencies: %11lu\n", | |
265 | nr_irq_unsafe * nr_irq_safe + | |
266 | nr_hardirq_unsafe * nr_hardirq_safe + | |
267 | nr_list_entries); | |
268 | ||
8e18257d | 269 | #ifdef CONFIG_PROVE_LOCKING |
a8f24a39 | 270 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n", |
2212684a | 271 | lock_chain_count(), MAX_LOCKDEP_CHAINS); |
443cd507 | 272 | seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n", |
cd1a28e8 | 273 | nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS); |
8e18257d | 274 | #endif |
a8f24a39 IM |
275 | |
276 | #ifdef CONFIG_TRACE_IRQFLAGS | |
277 | seq_printf(m, " in-hardirq chains: %11u\n", | |
278 | nr_hardirq_chains); | |
279 | seq_printf(m, " in-softirq chains: %11u\n", | |
280 | nr_softirq_chains); | |
281 | #endif | |
282 | seq_printf(m, " in-process chains: %11u\n", | |
283 | nr_process_chains); | |
284 | seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n", | |
285 | nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); | |
286 | seq_printf(m, " combined max dependencies: %11u\n", | |
287 | (nr_hardirq_chains + 1) * | |
288 | (nr_softirq_chains + 1) * | |
289 | (nr_process_chains + 1) | |
290 | ); | |
291 | seq_printf(m, " hardirq-safe locks: %11lu\n", | |
292 | nr_hardirq_safe); | |
293 | seq_printf(m, " hardirq-unsafe locks: %11lu\n", | |
294 | nr_hardirq_unsafe); | |
295 | seq_printf(m, " softirq-safe locks: %11lu\n", | |
296 | nr_softirq_safe); | |
297 | seq_printf(m, " softirq-unsafe locks: %11lu\n", | |
298 | nr_softirq_unsafe); | |
299 | seq_printf(m, " irq-safe locks: %11lu\n", | |
300 | nr_irq_safe); | |
301 | seq_printf(m, " irq-unsafe locks: %11lu\n", | |
302 | nr_irq_unsafe); | |
303 | ||
304 | seq_printf(m, " hardirq-read-safe locks: %11lu\n", | |
305 | nr_hardirq_read_safe); | |
306 | seq_printf(m, " hardirq-read-unsafe locks: %11lu\n", | |
307 | nr_hardirq_read_unsafe); | |
308 | seq_printf(m, " softirq-read-safe locks: %11lu\n", | |
309 | nr_softirq_read_safe); | |
310 | seq_printf(m, " softirq-read-unsafe locks: %11lu\n", | |
311 | nr_softirq_read_unsafe); | |
312 | seq_printf(m, " irq-read-safe locks: %11lu\n", | |
313 | nr_irq_read_safe); | |
314 | seq_printf(m, " irq-read-unsafe locks: %11lu\n", | |
315 | nr_irq_read_unsafe); | |
316 | ||
317 | seq_printf(m, " uncategorized locks: %11lu\n", | |
318 | nr_uncategorized); | |
319 | seq_printf(m, " unused locks: %11lu\n", | |
320 | nr_unused); | |
321 | seq_printf(m, " max locking depth: %11u\n", | |
322 | max_lockdep_depth); | |
bbfa2622 | 323 | #ifdef CONFIG_PROVE_LOCKING |
12f3dfd0 ML |
324 | seq_printf(m, " max bfs queue depth: %11u\n", |
325 | max_bfs_queue_depth); | |
bbfa2622 | 326 | #endif |
a8f24a39 IM |
327 | lockdep_stats_debug_show(m); |
328 | seq_printf(m, " debug_locks: %11u\n", | |
329 | debug_locks); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
c46261de PZ |
334 | #ifdef CONFIG_LOCK_STAT |
335 | ||
336 | struct lock_stat_data { | |
337 | struct lock_class *class; | |
338 | struct lock_class_stats stats; | |
339 | }; | |
340 | ||
341 | struct lock_stat_seq { | |
c46261de PZ |
342 | struct lock_stat_data *iter_end; |
343 | struct lock_stat_data stats[MAX_LOCKDEP_KEYS]; | |
344 | }; | |
345 | ||
346 | /* | |
347 | * sort on absolute number of contentions | |
348 | */ | |
349 | static int lock_stat_cmp(const void *l, const void *r) | |
350 | { | |
351 | const struct lock_stat_data *dl = l, *dr = r; | |
352 | unsigned long nl, nr; | |
353 | ||
354 | nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr; | |
355 | nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr; | |
356 | ||
357 | return nr - nl; | |
358 | } | |
359 | ||
360 | static void seq_line(struct seq_file *m, char c, int offset, int length) | |
361 | { | |
362 | int i; | |
363 | ||
364 | for (i = 0; i < offset; i++) | |
365 | seq_puts(m, " "); | |
366 | for (i = 0; i < length; i++) | |
367 | seq_printf(m, "%c", c); | |
368 | seq_puts(m, "\n"); | |
369 | } | |
370 | ||
371 | static void snprint_time(char *buf, size_t bufsiz, s64 nr) | |
372 | { | |
6918bc5c PZ |
373 | s64 div; |
374 | s32 rem; | |
c46261de | 375 | |
2189459d | 376 | nr += 5; /* for display rounding */ |
6918bc5c PZ |
377 | div = div_s64_rem(nr, 1000, &rem); |
378 | snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10); | |
c46261de PZ |
379 | } |
380 | ||
381 | static void seq_time(struct seq_file *m, s64 time) | |
382 | { | |
383 | char num[15]; | |
384 | ||
385 | snprint_time(num, sizeof(num), time); | |
386 | seq_printf(m, " %14s", num); | |
387 | } | |
388 | ||
389 | static void seq_lock_time(struct seq_file *m, struct lock_time *lt) | |
390 | { | |
391 | seq_printf(m, "%14lu", lt->nr); | |
392 | seq_time(m, lt->min); | |
393 | seq_time(m, lt->max); | |
394 | seq_time(m, lt->total); | |
838cc7b4 | 395 | seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0); |
c46261de PZ |
396 | } |
397 | ||
398 | static void seq_stats(struct seq_file *m, struct lock_stat_data *data) | |
399 | { | |
cee34d88 | 400 | struct lockdep_subclass_key *ckey; |
c46261de | 401 | struct lock_class_stats *stats; |
cee34d88 PZ |
402 | struct lock_class *class; |
403 | const char *cname; | |
c46261de | 404 | int i, namelen; |
cee34d88 | 405 | char name[39]; |
c46261de PZ |
406 | |
407 | class = data->class; | |
408 | stats = &data->stats; | |
409 | ||
d38e1d5a PZ |
410 | namelen = 38; |
411 | if (class->name_version > 1) | |
412 | namelen -= 2; /* XXX truncates versions > 9 */ | |
413 | if (class->subclass) | |
414 | namelen -= 2; | |
415 | ||
cee34d88 PZ |
416 | rcu_read_lock_sched(); |
417 | cname = rcu_dereference_sched(class->name); | |
418 | ckey = rcu_dereference_sched(class->key); | |
419 | ||
420 | if (!cname && !ckey) { | |
421 | rcu_read_unlock_sched(); | |
422 | return; | |
423 | ||
424 | } else if (!cname) { | |
d38e1d5a PZ |
425 | char str[KSYM_NAME_LEN]; |
426 | const char *key_name; | |
427 | ||
cee34d88 | 428 | key_name = __get_key_name(ckey, str); |
d38e1d5a PZ |
429 | snprintf(name, namelen, "%s", key_name); |
430 | } else { | |
cee34d88 | 431 | snprintf(name, namelen, "%s", cname); |
d38e1d5a | 432 | } |
cee34d88 PZ |
433 | rcu_read_unlock_sched(); |
434 | ||
c46261de | 435 | namelen = strlen(name); |
d38e1d5a PZ |
436 | if (class->name_version > 1) { |
437 | snprintf(name+namelen, 3, "#%d", class->name_version); | |
438 | namelen += 2; | |
439 | } | |
440 | if (class->subclass) { | |
441 | snprintf(name+namelen, 3, "/%d", class->subclass); | |
442 | namelen += 2; | |
443 | } | |
c46261de PZ |
444 | |
445 | if (stats->write_holdtime.nr) { | |
446 | if (stats->read_holdtime.nr) | |
447 | seq_printf(m, "%38s-W:", name); | |
448 | else | |
449 | seq_printf(m, "%40s:", name); | |
450 | ||
96645678 | 451 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); |
c46261de | 452 | seq_lock_time(m, &stats->write_waittime); |
96645678 | 453 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); |
c46261de PZ |
454 | seq_lock_time(m, &stats->write_holdtime); |
455 | seq_puts(m, "\n"); | |
456 | } | |
457 | ||
458 | if (stats->read_holdtime.nr) { | |
459 | seq_printf(m, "%38s-R:", name); | |
96645678 | 460 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); |
c46261de | 461 | seq_lock_time(m, &stats->read_waittime); |
96645678 | 462 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); |
c46261de PZ |
463 | seq_lock_time(m, &stats->read_holdtime); |
464 | seq_puts(m, "\n"); | |
465 | } | |
466 | ||
467 | if (stats->read_waittime.nr + stats->write_waittime.nr == 0) | |
468 | return; | |
469 | ||
470 | if (stats->read_holdtime.nr) | |
471 | namelen += 2; | |
472 | ||
c7e78cff | 473 | for (i = 0; i < LOCKSTAT_POINTS; i++) { |
c46261de PZ |
474 | char ip[32]; |
475 | ||
476 | if (class->contention_point[i] == 0) | |
477 | break; | |
478 | ||
479 | if (!i) | |
480 | seq_line(m, '-', 40-namelen, namelen); | |
481 | ||
c46261de PZ |
482 | snprintf(ip, sizeof(ip), "[<%p>]", |
483 | (void *)class->contention_point[i]); | |
3cf9b85b JP |
484 | seq_printf(m, "%40s %14lu %29s %pS\n", |
485 | name, stats->contention_point[i], | |
486 | ip, (void *)class->contention_point[i]); | |
c46261de | 487 | } |
c7e78cff | 488 | for (i = 0; i < LOCKSTAT_POINTS; i++) { |
c7e78cff PZ |
489 | char ip[32]; |
490 | ||
491 | if (class->contending_point[i] == 0) | |
492 | break; | |
493 | ||
494 | if (!i) | |
495 | seq_line(m, '-', 40-namelen, namelen); | |
496 | ||
c7e78cff PZ |
497 | snprintf(ip, sizeof(ip), "[<%p>]", |
498 | (void *)class->contending_point[i]); | |
3cf9b85b JP |
499 | seq_printf(m, "%40s %14lu %29s %pS\n", |
500 | name, stats->contending_point[i], | |
501 | ip, (void *)class->contending_point[i]); | |
c7e78cff | 502 | } |
c46261de PZ |
503 | if (i) { |
504 | seq_puts(m, "\n"); | |
1232e380 | 505 | seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1)); |
c46261de PZ |
506 | seq_puts(m, "\n"); |
507 | } | |
508 | } | |
509 | ||
510 | static void seq_header(struct seq_file *m) | |
511 | { | |
1232e380 | 512 | seq_puts(m, "lock_stat version 0.4\n"); |
9833f8cb PZ |
513 | |
514 | if (unlikely(!debug_locks)) | |
515 | seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n"); | |
516 | ||
1232e380 DB |
517 | seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1)); |
518 | seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s " | |
96645678 | 519 | "%14s %14s\n", |
c46261de | 520 | "class name", |
96645678 | 521 | "con-bounces", |
c46261de PZ |
522 | "contentions", |
523 | "waittime-min", | |
524 | "waittime-max", | |
525 | "waittime-total", | |
1232e380 | 526 | "waittime-avg", |
96645678 | 527 | "acq-bounces", |
c46261de PZ |
528 | "acquisitions", |
529 | "holdtime-min", | |
530 | "holdtime-max", | |
1232e380 DB |
531 | "holdtime-total", |
532 | "holdtime-avg"); | |
533 | seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1)); | |
c46261de PZ |
534 | seq_printf(m, "\n"); |
535 | } | |
536 | ||
537 | static void *ls_start(struct seq_file *m, loff_t *pos) | |
538 | { | |
539 | struct lock_stat_seq *data = m->private; | |
96004bb2 | 540 | struct lock_stat_data *iter; |
c46261de | 541 | |
94c61c0a TP |
542 | if (*pos == 0) |
543 | return SEQ_START_TOKEN; | |
c46261de | 544 | |
96004bb2 LZ |
545 | iter = data->stats + (*pos - 1); |
546 | if (iter >= data->iter_end) | |
547 | iter = NULL; | |
4b32d0a4 | 548 | |
96004bb2 | 549 | return iter; |
c46261de PZ |
550 | } |
551 | ||
552 | static void *ls_next(struct seq_file *m, void *v, loff_t *pos) | |
553 | { | |
c46261de | 554 | (*pos)++; |
96004bb2 | 555 | return ls_start(m, pos); |
c46261de PZ |
556 | } |
557 | ||
558 | static void ls_stop(struct seq_file *m, void *v) | |
559 | { | |
560 | } | |
561 | ||
562 | static int ls_show(struct seq_file *m, void *v) | |
563 | { | |
94c61c0a TP |
564 | if (v == SEQ_START_TOKEN) |
565 | seq_header(m); | |
566 | else | |
567 | seq_stats(m, v); | |
c46261de | 568 | |
c46261de PZ |
569 | return 0; |
570 | } | |
571 | ||
88e9d34c | 572 | static const struct seq_operations lockstat_ops = { |
c46261de PZ |
573 | .start = ls_start, |
574 | .next = ls_next, | |
575 | .stop = ls_stop, | |
576 | .show = ls_show, | |
577 | }; | |
578 | ||
579 | static int lock_stat_open(struct inode *inode, struct file *file) | |
580 | { | |
581 | int res; | |
582 | struct lock_class *class; | |
583 | struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); | |
584 | ||
585 | if (!data) | |
586 | return -ENOMEM; | |
587 | ||
588 | res = seq_open(file, &lockstat_ops); | |
589 | if (!res) { | |
590 | struct lock_stat_data *iter = data->stats; | |
591 | struct seq_file *m = file->private_data; | |
592 | ||
c46261de PZ |
593 | list_for_each_entry(class, &all_lock_classes, lock_entry) { |
594 | iter->class = class; | |
595 | iter->stats = lock_stats(class); | |
596 | iter++; | |
597 | } | |
598 | data->iter_end = iter; | |
599 | ||
96004bb2 | 600 | sort(data->stats, data->iter_end - data->stats, |
c46261de PZ |
601 | sizeof(struct lock_stat_data), |
602 | lock_stat_cmp, NULL); | |
603 | ||
604 | m->private = data; | |
605 | } else | |
606 | vfree(data); | |
607 | ||
608 | return res; | |
609 | } | |
610 | ||
611 | static ssize_t lock_stat_write(struct file *file, const char __user *buf, | |
612 | size_t count, loff_t *ppos) | |
613 | { | |
614 | struct lock_class *class; | |
615 | char c; | |
616 | ||
617 | if (count) { | |
618 | if (get_user(c, buf)) | |
619 | return -EFAULT; | |
620 | ||
621 | if (c != '0') | |
622 | return count; | |
623 | ||
624 | list_for_each_entry(class, &all_lock_classes, lock_entry) | |
625 | clear_lock_stats(class); | |
626 | } | |
627 | return count; | |
628 | } | |
629 | ||
630 | static int lock_stat_release(struct inode *inode, struct file *file) | |
631 | { | |
632 | struct seq_file *seq = file->private_data; | |
633 | ||
634 | vfree(seq->private); | |
c46261de PZ |
635 | return seq_release(inode, file); |
636 | } | |
637 | ||
638 | static const struct file_operations proc_lock_stat_operations = { | |
639 | .open = lock_stat_open, | |
640 | .write = lock_stat_write, | |
641 | .read = seq_read, | |
642 | .llseek = seq_lseek, | |
643 | .release = lock_stat_release, | |
644 | }; | |
645 | #endif /* CONFIG_LOCK_STAT */ | |
646 | ||
a8f24a39 IM |
647 | static int __init lockdep_proc_init(void) |
648 | { | |
fddda2b7 | 649 | proc_create_seq("lockdep", S_IRUSR, NULL, &lockdep_ops); |
cd1a28e8 | 650 | #ifdef CONFIG_PROVE_LOCKING |
fddda2b7 | 651 | proc_create_seq("lockdep_chains", S_IRUSR, NULL, &lockdep_chains_ops); |
cd1a28e8 | 652 | #endif |
3f3942ac | 653 | proc_create_single("lockdep_stats", S_IRUSR, NULL, lockdep_stats_show); |
c46261de | 654 | #ifdef CONFIG_LOCK_STAT |
9795447f LZ |
655 | proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL, |
656 | &proc_lock_stat_operations); | |
c46261de PZ |
657 | #endif |
658 | ||
a8f24a39 IM |
659 | return 0; |
660 | } | |
661 | ||
662 | __initcall(lockdep_proc_init); | |
663 |