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1 | /* | |
2 | * kernel/lockdep_proc.c | |
3 | * | |
4 | * Runtime locking correctness validator | |
5 | * | |
6 | * Started by Ingo Molnar: | |
7 | * | |
8 | * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> | |
9 | * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> | |
10 | * | |
11 | * Code for /proc/lockdep and /proc/lockdep_stats: | |
12 | * | |
13 | */ | |
14 | #include <linux/module.h> | |
15 | #include <linux/proc_fs.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <linux/kallsyms.h> | |
18 | #include <linux/debug_locks.h> | |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/sort.h> | |
21 | #include <asm/uaccess.h> | |
22 | #include <asm/div64.h> | |
23 | ||
24 | #include "lockdep_internals.h" | |
25 | ||
26 | static void *l_next(struct seq_file *m, void *v, loff_t *pos) | |
27 | { | |
28 | return seq_list_next(v, &all_lock_classes, pos); | |
29 | } | |
30 | ||
31 | static void *l_start(struct seq_file *m, loff_t *pos) | |
32 | { | |
33 | return seq_list_start_head(&all_lock_classes, *pos); | |
34 | } | |
35 | ||
36 | static void l_stop(struct seq_file *m, void *v) | |
37 | { | |
38 | } | |
39 | ||
40 | static void print_name(struct seq_file *m, struct lock_class *class) | |
41 | { | |
42 | char str[128]; | |
43 | const char *name = class->name; | |
44 | ||
45 | if (!name) { | |
46 | name = __get_key_name(class->key, str); | |
47 | seq_printf(m, "%s", name); | |
48 | } else{ | |
49 | seq_printf(m, "%s", name); | |
50 | if (class->name_version > 1) | |
51 | seq_printf(m, "#%d", class->name_version); | |
52 | if (class->subclass) | |
53 | seq_printf(m, "/%d", class->subclass); | |
54 | } | |
55 | } | |
56 | ||
57 | static int l_show(struct seq_file *m, void *v) | |
58 | { | |
59 | struct lock_class *class = list_entry(v, struct lock_class, lock_entry); | |
60 | struct lock_list *entry; | |
61 | char usage[LOCK_USAGE_CHARS]; | |
62 | ||
63 | if (v == &all_lock_classes) { | |
64 | seq_printf(m, "all lock classes:\n"); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | seq_printf(m, "%p", class->key); | |
69 | #ifdef CONFIG_DEBUG_LOCKDEP | |
70 | seq_printf(m, " OPS:%8ld", class->ops); | |
71 | #endif | |
72 | #ifdef CONFIG_PROVE_LOCKING | |
73 | seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class)); | |
74 | seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class)); | |
75 | #endif | |
76 | ||
77 | get_usage_chars(class, usage); | |
78 | seq_printf(m, " %s", usage); | |
79 | ||
80 | seq_printf(m, ": "); | |
81 | print_name(m, class); | |
82 | seq_puts(m, "\n"); | |
83 | ||
84 | list_for_each_entry(entry, &class->locks_after, entry) { | |
85 | if (entry->distance == 1) { | |
86 | seq_printf(m, " -> [%p] ", entry->class->key); | |
87 | print_name(m, entry->class); | |
88 | seq_puts(m, "\n"); | |
89 | } | |
90 | } | |
91 | seq_puts(m, "\n"); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | static const struct seq_operations lockdep_ops = { | |
97 | .start = l_start, | |
98 | .next = l_next, | |
99 | .stop = l_stop, | |
100 | .show = l_show, | |
101 | }; | |
102 | ||
103 | static int lockdep_open(struct inode *inode, struct file *file) | |
104 | { | |
105 | return seq_open(file, &lockdep_ops); | |
106 | } | |
107 | ||
108 | static const struct file_operations proc_lockdep_operations = { | |
109 | .open = lockdep_open, | |
110 | .read = seq_read, | |
111 | .llseek = seq_lseek, | |
112 | .release = seq_release, | |
113 | }; | |
114 | ||
115 | #ifdef CONFIG_PROVE_LOCKING | |
116 | static void *lc_start(struct seq_file *m, loff_t *pos) | |
117 | { | |
118 | if (*pos == 0) | |
119 | return SEQ_START_TOKEN; | |
120 | ||
121 | if (*pos - 1 < nr_lock_chains) | |
122 | return lock_chains + (*pos - 1); | |
123 | ||
124 | return NULL; | |
125 | } | |
126 | ||
127 | static void *lc_next(struct seq_file *m, void *v, loff_t *pos) | |
128 | { | |
129 | (*pos)++; | |
130 | return lc_start(m, pos); | |
131 | } | |
132 | ||
133 | static void lc_stop(struct seq_file *m, void *v) | |
134 | { | |
135 | } | |
136 | ||
137 | static int lc_show(struct seq_file *m, void *v) | |
138 | { | |
139 | struct lock_chain *chain = v; | |
140 | struct lock_class *class; | |
141 | int i; | |
142 | ||
143 | if (v == SEQ_START_TOKEN) { | |
144 | seq_printf(m, "all lock chains:\n"); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | seq_printf(m, "irq_context: %d\n", chain->irq_context); | |
149 | ||
150 | for (i = 0; i < chain->depth; i++) { | |
151 | class = lock_chain_get_class(chain, i); | |
152 | if (!class->key) | |
153 | continue; | |
154 | ||
155 | seq_printf(m, "[%p] ", class->key); | |
156 | print_name(m, class); | |
157 | seq_puts(m, "\n"); | |
158 | } | |
159 | seq_puts(m, "\n"); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static const struct seq_operations lockdep_chains_ops = { | |
165 | .start = lc_start, | |
166 | .next = lc_next, | |
167 | .stop = lc_stop, | |
168 | .show = lc_show, | |
169 | }; | |
170 | ||
171 | static int lockdep_chains_open(struct inode *inode, struct file *file) | |
172 | { | |
173 | return seq_open(file, &lockdep_chains_ops); | |
174 | } | |
175 | ||
176 | static const struct file_operations proc_lockdep_chains_operations = { | |
177 | .open = lockdep_chains_open, | |
178 | .read = seq_read, | |
179 | .llseek = seq_lseek, | |
180 | .release = seq_release, | |
181 | }; | |
182 | #endif /* CONFIG_PROVE_LOCKING */ | |
183 | ||
184 | static void lockdep_stats_debug_show(struct seq_file *m) | |
185 | { | |
186 | #ifdef CONFIG_DEBUG_LOCKDEP | |
187 | unsigned long long hi1 = debug_atomic_read(hardirqs_on_events), | |
188 | hi2 = debug_atomic_read(hardirqs_off_events), | |
189 | hr1 = debug_atomic_read(redundant_hardirqs_on), | |
190 | hr2 = debug_atomic_read(redundant_hardirqs_off), | |
191 | si1 = debug_atomic_read(softirqs_on_events), | |
192 | si2 = debug_atomic_read(softirqs_off_events), | |
193 | sr1 = debug_atomic_read(redundant_softirqs_on), | |
194 | sr2 = debug_atomic_read(redundant_softirqs_off); | |
195 | ||
196 | seq_printf(m, " chain lookup misses: %11llu\n", | |
197 | debug_atomic_read(chain_lookup_misses)); | |
198 | seq_printf(m, " chain lookup hits: %11llu\n", | |
199 | debug_atomic_read(chain_lookup_hits)); | |
200 | seq_printf(m, " cyclic checks: %11llu\n", | |
201 | debug_atomic_read(nr_cyclic_checks)); | |
202 | seq_printf(m, " find-mask forwards checks: %11llu\n", | |
203 | debug_atomic_read(nr_find_usage_forwards_checks)); | |
204 | seq_printf(m, " find-mask backwards checks: %11llu\n", | |
205 | debug_atomic_read(nr_find_usage_backwards_checks)); | |
206 | ||
207 | seq_printf(m, " hardirq on events: %11llu\n", hi1); | |
208 | seq_printf(m, " hardirq off events: %11llu\n", hi2); | |
209 | seq_printf(m, " redundant hardirq ons: %11llu\n", hr1); | |
210 | seq_printf(m, " redundant hardirq offs: %11llu\n", hr2); | |
211 | seq_printf(m, " softirq on events: %11llu\n", si1); | |
212 | seq_printf(m, " softirq off events: %11llu\n", si2); | |
213 | seq_printf(m, " redundant softirq ons: %11llu\n", sr1); | |
214 | seq_printf(m, " redundant softirq offs: %11llu\n", sr2); | |
215 | #endif | |
216 | } | |
217 | ||
218 | static int lockdep_stats_show(struct seq_file *m, void *v) | |
219 | { | |
220 | struct lock_class *class; | |
221 | unsigned long nr_unused = 0, nr_uncategorized = 0, | |
222 | nr_irq_safe = 0, nr_irq_unsafe = 0, | |
223 | nr_softirq_safe = 0, nr_softirq_unsafe = 0, | |
224 | nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, | |
225 | nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, | |
226 | nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, | |
227 | nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, | |
228 | sum_forward_deps = 0, factor = 0; | |
229 | ||
230 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
231 | ||
232 | if (class->usage_mask == 0) | |
233 | nr_unused++; | |
234 | if (class->usage_mask == LOCKF_USED) | |
235 | nr_uncategorized++; | |
236 | if (class->usage_mask & LOCKF_USED_IN_IRQ) | |
237 | nr_irq_safe++; | |
238 | if (class->usage_mask & LOCKF_ENABLED_IRQ) | |
239 | nr_irq_unsafe++; | |
240 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) | |
241 | nr_softirq_safe++; | |
242 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ) | |
243 | nr_softirq_unsafe++; | |
244 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) | |
245 | nr_hardirq_safe++; | |
246 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ) | |
247 | nr_hardirq_unsafe++; | |
248 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) | |
249 | nr_irq_read_safe++; | |
250 | if (class->usage_mask & LOCKF_ENABLED_IRQ_READ) | |
251 | nr_irq_read_unsafe++; | |
252 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) | |
253 | nr_softirq_read_safe++; | |
254 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ) | |
255 | nr_softirq_read_unsafe++; | |
256 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) | |
257 | nr_hardirq_read_safe++; | |
258 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ) | |
259 | nr_hardirq_read_unsafe++; | |
260 | ||
261 | #ifdef CONFIG_PROVE_LOCKING | |
262 | sum_forward_deps += lockdep_count_forward_deps(class); | |
263 | #endif | |
264 | } | |
265 | #ifdef CONFIG_DEBUG_LOCKDEP | |
266 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused); | |
267 | #endif | |
268 | seq_printf(m, " lock-classes: %11lu [max: %lu]\n", | |
269 | nr_lock_classes, MAX_LOCKDEP_KEYS); | |
270 | seq_printf(m, " direct dependencies: %11lu [max: %lu]\n", | |
271 | nr_list_entries, MAX_LOCKDEP_ENTRIES); | |
272 | seq_printf(m, " indirect dependencies: %11lu\n", | |
273 | sum_forward_deps); | |
274 | ||
275 | /* | |
276 | * Total number of dependencies: | |
277 | * | |
278 | * All irq-safe locks may nest inside irq-unsafe locks, | |
279 | * plus all the other known dependencies: | |
280 | */ | |
281 | seq_printf(m, " all direct dependencies: %11lu\n", | |
282 | nr_irq_unsafe * nr_irq_safe + | |
283 | nr_hardirq_unsafe * nr_hardirq_safe + | |
284 | nr_list_entries); | |
285 | ||
286 | /* | |
287 | * Estimated factor between direct and indirect | |
288 | * dependencies: | |
289 | */ | |
290 | if (nr_list_entries) | |
291 | factor = sum_forward_deps / nr_list_entries; | |
292 | ||
293 | #ifdef CONFIG_PROVE_LOCKING | |
294 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n", | |
295 | nr_lock_chains, MAX_LOCKDEP_CHAINS); | |
296 | seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n", | |
297 | nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS); | |
298 | #endif | |
299 | ||
300 | #ifdef CONFIG_TRACE_IRQFLAGS | |
301 | seq_printf(m, " in-hardirq chains: %11u\n", | |
302 | nr_hardirq_chains); | |
303 | seq_printf(m, " in-softirq chains: %11u\n", | |
304 | nr_softirq_chains); | |
305 | #endif | |
306 | seq_printf(m, " in-process chains: %11u\n", | |
307 | nr_process_chains); | |
308 | seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n", | |
309 | nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); | |
310 | seq_printf(m, " combined max dependencies: %11u\n", | |
311 | (nr_hardirq_chains + 1) * | |
312 | (nr_softirq_chains + 1) * | |
313 | (nr_process_chains + 1) | |
314 | ); | |
315 | seq_printf(m, " hardirq-safe locks: %11lu\n", | |
316 | nr_hardirq_safe); | |
317 | seq_printf(m, " hardirq-unsafe locks: %11lu\n", | |
318 | nr_hardirq_unsafe); | |
319 | seq_printf(m, " softirq-safe locks: %11lu\n", | |
320 | nr_softirq_safe); | |
321 | seq_printf(m, " softirq-unsafe locks: %11lu\n", | |
322 | nr_softirq_unsafe); | |
323 | seq_printf(m, " irq-safe locks: %11lu\n", | |
324 | nr_irq_safe); | |
325 | seq_printf(m, " irq-unsafe locks: %11lu\n", | |
326 | nr_irq_unsafe); | |
327 | ||
328 | seq_printf(m, " hardirq-read-safe locks: %11lu\n", | |
329 | nr_hardirq_read_safe); | |
330 | seq_printf(m, " hardirq-read-unsafe locks: %11lu\n", | |
331 | nr_hardirq_read_unsafe); | |
332 | seq_printf(m, " softirq-read-safe locks: %11lu\n", | |
333 | nr_softirq_read_safe); | |
334 | seq_printf(m, " softirq-read-unsafe locks: %11lu\n", | |
335 | nr_softirq_read_unsafe); | |
336 | seq_printf(m, " irq-read-safe locks: %11lu\n", | |
337 | nr_irq_read_safe); | |
338 | seq_printf(m, " irq-read-unsafe locks: %11lu\n", | |
339 | nr_irq_read_unsafe); | |
340 | ||
341 | seq_printf(m, " uncategorized locks: %11lu\n", | |
342 | nr_uncategorized); | |
343 | seq_printf(m, " unused locks: %11lu\n", | |
344 | nr_unused); | |
345 | seq_printf(m, " max locking depth: %11u\n", | |
346 | max_lockdep_depth); | |
347 | #ifdef CONFIG_PROVE_LOCKING | |
348 | seq_printf(m, " max bfs queue depth: %11u\n", | |
349 | max_bfs_queue_depth); | |
350 | #endif | |
351 | lockdep_stats_debug_show(m); | |
352 | seq_printf(m, " debug_locks: %11u\n", | |
353 | debug_locks); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | static int lockdep_stats_open(struct inode *inode, struct file *file) | |
359 | { | |
360 | return single_open(file, lockdep_stats_show, NULL); | |
361 | } | |
362 | ||
363 | static const struct file_operations proc_lockdep_stats_operations = { | |
364 | .open = lockdep_stats_open, | |
365 | .read = seq_read, | |
366 | .llseek = seq_lseek, | |
367 | .release = single_release, | |
368 | }; | |
369 | ||
370 | #ifdef CONFIG_LOCK_STAT | |
371 | ||
372 | struct lock_stat_data { | |
373 | struct lock_class *class; | |
374 | struct lock_class_stats stats; | |
375 | }; | |
376 | ||
377 | struct lock_stat_seq { | |
378 | struct lock_stat_data *iter_end; | |
379 | struct lock_stat_data stats[MAX_LOCKDEP_KEYS]; | |
380 | }; | |
381 | ||
382 | /* | |
383 | * sort on absolute number of contentions | |
384 | */ | |
385 | static int lock_stat_cmp(const void *l, const void *r) | |
386 | { | |
387 | const struct lock_stat_data *dl = l, *dr = r; | |
388 | unsigned long nl, nr; | |
389 | ||
390 | nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr; | |
391 | nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr; | |
392 | ||
393 | return nr - nl; | |
394 | } | |
395 | ||
396 | static void seq_line(struct seq_file *m, char c, int offset, int length) | |
397 | { | |
398 | int i; | |
399 | ||
400 | for (i = 0; i < offset; i++) | |
401 | seq_puts(m, " "); | |
402 | for (i = 0; i < length; i++) | |
403 | seq_printf(m, "%c", c); | |
404 | seq_puts(m, "\n"); | |
405 | } | |
406 | ||
407 | static void snprint_time(char *buf, size_t bufsiz, s64 nr) | |
408 | { | |
409 | s64 div; | |
410 | s32 rem; | |
411 | ||
412 | nr += 5; /* for display rounding */ | |
413 | div = div_s64_rem(nr, 1000, &rem); | |
414 | snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10); | |
415 | } | |
416 | ||
417 | static void seq_time(struct seq_file *m, s64 time) | |
418 | { | |
419 | char num[15]; | |
420 | ||
421 | snprint_time(num, sizeof(num), time); | |
422 | seq_printf(m, " %14s", num); | |
423 | } | |
424 | ||
425 | static void seq_lock_time(struct seq_file *m, struct lock_time *lt) | |
426 | { | |
427 | seq_printf(m, "%14lu", lt->nr); | |
428 | seq_time(m, lt->min); | |
429 | seq_time(m, lt->max); | |
430 | seq_time(m, lt->total); | |
431 | } | |
432 | ||
433 | static void seq_stats(struct seq_file *m, struct lock_stat_data *data) | |
434 | { | |
435 | char name[39]; | |
436 | struct lock_class *class; | |
437 | struct lock_class_stats *stats; | |
438 | int i, namelen; | |
439 | ||
440 | class = data->class; | |
441 | stats = &data->stats; | |
442 | ||
443 | namelen = 38; | |
444 | if (class->name_version > 1) | |
445 | namelen -= 2; /* XXX truncates versions > 9 */ | |
446 | if (class->subclass) | |
447 | namelen -= 2; | |
448 | ||
449 | if (!class->name) { | |
450 | char str[KSYM_NAME_LEN]; | |
451 | const char *key_name; | |
452 | ||
453 | key_name = __get_key_name(class->key, str); | |
454 | snprintf(name, namelen, "%s", key_name); | |
455 | } else { | |
456 | snprintf(name, namelen, "%s", class->name); | |
457 | } | |
458 | namelen = strlen(name); | |
459 | if (class->name_version > 1) { | |
460 | snprintf(name+namelen, 3, "#%d", class->name_version); | |
461 | namelen += 2; | |
462 | } | |
463 | if (class->subclass) { | |
464 | snprintf(name+namelen, 3, "/%d", class->subclass); | |
465 | namelen += 2; | |
466 | } | |
467 | ||
468 | if (stats->write_holdtime.nr) { | |
469 | if (stats->read_holdtime.nr) | |
470 | seq_printf(m, "%38s-W:", name); | |
471 | else | |
472 | seq_printf(m, "%40s:", name); | |
473 | ||
474 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); | |
475 | seq_lock_time(m, &stats->write_waittime); | |
476 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); | |
477 | seq_lock_time(m, &stats->write_holdtime); | |
478 | seq_puts(m, "\n"); | |
479 | } | |
480 | ||
481 | if (stats->read_holdtime.nr) { | |
482 | seq_printf(m, "%38s-R:", name); | |
483 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); | |
484 | seq_lock_time(m, &stats->read_waittime); | |
485 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); | |
486 | seq_lock_time(m, &stats->read_holdtime); | |
487 | seq_puts(m, "\n"); | |
488 | } | |
489 | ||
490 | if (stats->read_waittime.nr + stats->write_waittime.nr == 0) | |
491 | return; | |
492 | ||
493 | if (stats->read_holdtime.nr) | |
494 | namelen += 2; | |
495 | ||
496 | for (i = 0; i < LOCKSTAT_POINTS; i++) { | |
497 | char sym[KSYM_SYMBOL_LEN]; | |
498 | char ip[32]; | |
499 | ||
500 | if (class->contention_point[i] == 0) | |
501 | break; | |
502 | ||
503 | if (!i) | |
504 | seq_line(m, '-', 40-namelen, namelen); | |
505 | ||
506 | sprint_symbol(sym, class->contention_point[i]); | |
507 | snprintf(ip, sizeof(ip), "[<%p>]", | |
508 | (void *)class->contention_point[i]); | |
509 | seq_printf(m, "%40s %14lu %29s %s\n", name, | |
510 | stats->contention_point[i], | |
511 | ip, sym); | |
512 | } | |
513 | for (i = 0; i < LOCKSTAT_POINTS; i++) { | |
514 | char sym[KSYM_SYMBOL_LEN]; | |
515 | char ip[32]; | |
516 | ||
517 | if (class->contending_point[i] == 0) | |
518 | break; | |
519 | ||
520 | if (!i) | |
521 | seq_line(m, '-', 40-namelen, namelen); | |
522 | ||
523 | sprint_symbol(sym, class->contending_point[i]); | |
524 | snprintf(ip, sizeof(ip), "[<%p>]", | |
525 | (void *)class->contending_point[i]); | |
526 | seq_printf(m, "%40s %14lu %29s %s\n", name, | |
527 | stats->contending_point[i], | |
528 | ip, sym); | |
529 | } | |
530 | if (i) { | |
531 | seq_puts(m, "\n"); | |
532 | seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1)); | |
533 | seq_puts(m, "\n"); | |
534 | } | |
535 | } | |
536 | ||
537 | static void seq_header(struct seq_file *m) | |
538 | { | |
539 | seq_printf(m, "lock_stat version 0.3\n"); | |
540 | ||
541 | if (unlikely(!debug_locks)) | |
542 | seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n"); | |
543 | ||
544 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); | |
545 | seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s " | |
546 | "%14s %14s\n", | |
547 | "class name", | |
548 | "con-bounces", | |
549 | "contentions", | |
550 | "waittime-min", | |
551 | "waittime-max", | |
552 | "waittime-total", | |
553 | "acq-bounces", | |
554 | "acquisitions", | |
555 | "holdtime-min", | |
556 | "holdtime-max", | |
557 | "holdtime-total"); | |
558 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); | |
559 | seq_printf(m, "\n"); | |
560 | } | |
561 | ||
562 | static void *ls_start(struct seq_file *m, loff_t *pos) | |
563 | { | |
564 | struct lock_stat_seq *data = m->private; | |
565 | struct lock_stat_data *iter; | |
566 | ||
567 | if (*pos == 0) | |
568 | return SEQ_START_TOKEN; | |
569 | ||
570 | iter = data->stats + (*pos - 1); | |
571 | if (iter >= data->iter_end) | |
572 | iter = NULL; | |
573 | ||
574 | return iter; | |
575 | } | |
576 | ||
577 | static void *ls_next(struct seq_file *m, void *v, loff_t *pos) | |
578 | { | |
579 | (*pos)++; | |
580 | return ls_start(m, pos); | |
581 | } | |
582 | ||
583 | static void ls_stop(struct seq_file *m, void *v) | |
584 | { | |
585 | } | |
586 | ||
587 | static int ls_show(struct seq_file *m, void *v) | |
588 | { | |
589 | if (v == SEQ_START_TOKEN) | |
590 | seq_header(m); | |
591 | else | |
592 | seq_stats(m, v); | |
593 | ||
594 | return 0; | |
595 | } | |
596 | ||
597 | static const struct seq_operations lockstat_ops = { | |
598 | .start = ls_start, | |
599 | .next = ls_next, | |
600 | .stop = ls_stop, | |
601 | .show = ls_show, | |
602 | }; | |
603 | ||
604 | static int lock_stat_open(struct inode *inode, struct file *file) | |
605 | { | |
606 | int res; | |
607 | struct lock_class *class; | |
608 | struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); | |
609 | ||
610 | if (!data) | |
611 | return -ENOMEM; | |
612 | ||
613 | res = seq_open(file, &lockstat_ops); | |
614 | if (!res) { | |
615 | struct lock_stat_data *iter = data->stats; | |
616 | struct seq_file *m = file->private_data; | |
617 | ||
618 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
619 | iter->class = class; | |
620 | iter->stats = lock_stats(class); | |
621 | iter++; | |
622 | } | |
623 | data->iter_end = iter; | |
624 | ||
625 | sort(data->stats, data->iter_end - data->stats, | |
626 | sizeof(struct lock_stat_data), | |
627 | lock_stat_cmp, NULL); | |
628 | ||
629 | m->private = data; | |
630 | } else | |
631 | vfree(data); | |
632 | ||
633 | return res; | |
634 | } | |
635 | ||
636 | static ssize_t lock_stat_write(struct file *file, const char __user *buf, | |
637 | size_t count, loff_t *ppos) | |
638 | { | |
639 | struct lock_class *class; | |
640 | char c; | |
641 | ||
642 | if (count) { | |
643 | if (get_user(c, buf)) | |
644 | return -EFAULT; | |
645 | ||
646 | if (c != '0') | |
647 | return count; | |
648 | ||
649 | list_for_each_entry(class, &all_lock_classes, lock_entry) | |
650 | clear_lock_stats(class); | |
651 | } | |
652 | return count; | |
653 | } | |
654 | ||
655 | static int lock_stat_release(struct inode *inode, struct file *file) | |
656 | { | |
657 | struct seq_file *seq = file->private_data; | |
658 | ||
659 | vfree(seq->private); | |
660 | return seq_release(inode, file); | |
661 | } | |
662 | ||
663 | static const struct file_operations proc_lock_stat_operations = { | |
664 | .open = lock_stat_open, | |
665 | .write = lock_stat_write, | |
666 | .read = seq_read, | |
667 | .llseek = seq_lseek, | |
668 | .release = lock_stat_release, | |
669 | }; | |
670 | #endif /* CONFIG_LOCK_STAT */ | |
671 | ||
672 | static int __init lockdep_proc_init(void) | |
673 | { | |
674 | proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations); | |
675 | #ifdef CONFIG_PROVE_LOCKING | |
676 | proc_create("lockdep_chains", S_IRUSR, NULL, | |
677 | &proc_lockdep_chains_operations); | |
678 | #endif | |
679 | proc_create("lockdep_stats", S_IRUSR, NULL, | |
680 | &proc_lockdep_stats_operations); | |
681 | ||
682 | #ifdef CONFIG_LOCK_STAT | |
683 | proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL, | |
684 | &proc_lock_stat_operations); | |
685 | #endif | |
686 | ||
687 | return 0; | |
688 | } | |
689 | ||
690 | __initcall(lockdep_proc_init); | |
691 |