Commit | Line | Data |
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a8f24a39 IM |
1 | /* |
2 | * kernel/lockdep_proc.c | |
3 | * | |
4 | * Runtime locking correctness validator | |
5 | * | |
6 | * Started by Ingo Molnar: | |
7 | * | |
4b32d0a4 PZ |
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> | |
a8f24a39 IM |
10 | * |
11 | * Code for /proc/lockdep and /proc/lockdep_stats: | |
12 | * | |
13 | */ | |
a8f24a39 IM |
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> | |
c46261de PZ |
19 | #include <linux/vmalloc.h> |
20 | #include <linux/sort.h> | |
21 | #include <asm/uaccess.h> | |
22 | #include <asm/div64.h> | |
a8f24a39 IM |
23 | |
24 | #include "lockdep_internals.h" | |
25 | ||
26 | static void *l_next(struct seq_file *m, void *v, loff_t *pos) | |
27 | { | |
28 | struct lock_class *class = v; | |
29 | ||
30 | (*pos)++; | |
31 | ||
32 | if (class->lock_entry.next != &all_lock_classes) | |
33 | class = list_entry(class->lock_entry.next, struct lock_class, | |
34 | lock_entry); | |
35 | else | |
36 | class = NULL; | |
37 | m->private = class; | |
38 | ||
39 | return class; | |
40 | } | |
41 | ||
42 | static void *l_start(struct seq_file *m, loff_t *pos) | |
43 | { | |
44 | struct lock_class *class = m->private; | |
45 | ||
46 | if (&class->lock_entry == all_lock_classes.next) | |
47 | seq_printf(m, "all lock classes:\n"); | |
48 | ||
49 | return class; | |
50 | } | |
51 | ||
52 | static void l_stop(struct seq_file *m, void *v) | |
53 | { | |
54 | } | |
55 | ||
56 | static unsigned long count_forward_deps(struct lock_class *class) | |
57 | { | |
58 | struct lock_list *entry; | |
59 | unsigned long ret = 1; | |
60 | ||
61 | /* | |
62 | * Recurse this class's dependency list: | |
63 | */ | |
64 | list_for_each_entry(entry, &class->locks_after, entry) | |
65 | ret += count_forward_deps(entry->class); | |
66 | ||
67 | return ret; | |
68 | } | |
69 | ||
70 | static unsigned long count_backward_deps(struct lock_class *class) | |
71 | { | |
72 | struct lock_list *entry; | |
73 | unsigned long ret = 1; | |
74 | ||
75 | /* | |
76 | * Recurse this class's dependency list: | |
77 | */ | |
78 | list_for_each_entry(entry, &class->locks_before, entry) | |
79 | ret += count_backward_deps(entry->class); | |
80 | ||
81 | return ret; | |
82 | } | |
83 | ||
068135e6 JB |
84 | static void print_name(struct seq_file *m, struct lock_class *class) |
85 | { | |
86 | char str[128]; | |
87 | const char *name = class->name; | |
88 | ||
89 | if (!name) { | |
90 | name = __get_key_name(class->key, str); | |
91 | seq_printf(m, "%s", name); | |
92 | } else{ | |
93 | seq_printf(m, "%s", name); | |
94 | if (class->name_version > 1) | |
95 | seq_printf(m, "#%d", class->name_version); | |
96 | if (class->subclass) | |
97 | seq_printf(m, "/%d", class->subclass); | |
98 | } | |
99 | } | |
100 | ||
a8f24a39 IM |
101 | static int l_show(struct seq_file *m, void *v) |
102 | { | |
103 | unsigned long nr_forward_deps, nr_backward_deps; | |
104 | struct lock_class *class = m->private; | |
068135e6 JB |
105 | struct lock_list *entry; |
106 | char c1, c2, c3, c4; | |
a8f24a39 IM |
107 | |
108 | seq_printf(m, "%p", class->key); | |
109 | #ifdef CONFIG_DEBUG_LOCKDEP | |
110 | seq_printf(m, " OPS:%8ld", class->ops); | |
111 | #endif | |
112 | nr_forward_deps = count_forward_deps(class); | |
113 | seq_printf(m, " FD:%5ld", nr_forward_deps); | |
114 | ||
115 | nr_backward_deps = count_backward_deps(class); | |
116 | seq_printf(m, " BD:%5ld", nr_backward_deps); | |
117 | ||
118 | get_usage_chars(class, &c1, &c2, &c3, &c4); | |
119 | seq_printf(m, " %c%c%c%c", c1, c2, c3, c4); | |
120 | ||
068135e6 JB |
121 | seq_printf(m, ": "); |
122 | print_name(m, class); | |
123 | seq_puts(m, "\n"); | |
124 | ||
125 | list_for_each_entry(entry, &class->locks_after, entry) { | |
126 | if (entry->distance == 1) { | |
127 | seq_printf(m, " -> [%p] ", entry->class); | |
128 | print_name(m, entry->class); | |
129 | seq_puts(m, "\n"); | |
130 | } | |
a8f24a39 IM |
131 | } |
132 | seq_puts(m, "\n"); | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
15ad7cdc | 137 | static const struct seq_operations lockdep_ops = { |
a8f24a39 IM |
138 | .start = l_start, |
139 | .next = l_next, | |
140 | .stop = l_stop, | |
141 | .show = l_show, | |
142 | }; | |
143 | ||
144 | static int lockdep_open(struct inode *inode, struct file *file) | |
145 | { | |
146 | int res = seq_open(file, &lockdep_ops); | |
147 | if (!res) { | |
148 | struct seq_file *m = file->private_data; | |
149 | ||
150 | if (!list_empty(&all_lock_classes)) | |
151 | m->private = list_entry(all_lock_classes.next, | |
152 | struct lock_class, lock_entry); | |
153 | else | |
154 | m->private = NULL; | |
155 | } | |
156 | return res; | |
157 | } | |
158 | ||
15ad7cdc | 159 | static const struct file_operations proc_lockdep_operations = { |
a8f24a39 IM |
160 | .open = lockdep_open, |
161 | .read = seq_read, | |
162 | .llseek = seq_lseek, | |
163 | .release = seq_release, | |
164 | }; | |
165 | ||
166 | static void lockdep_stats_debug_show(struct seq_file *m) | |
167 | { | |
168 | #ifdef CONFIG_DEBUG_LOCKDEP | |
169 | unsigned int hi1 = debug_atomic_read(&hardirqs_on_events), | |
170 | hi2 = debug_atomic_read(&hardirqs_off_events), | |
171 | hr1 = debug_atomic_read(&redundant_hardirqs_on), | |
172 | hr2 = debug_atomic_read(&redundant_hardirqs_off), | |
173 | si1 = debug_atomic_read(&softirqs_on_events), | |
174 | si2 = debug_atomic_read(&softirqs_off_events), | |
175 | sr1 = debug_atomic_read(&redundant_softirqs_on), | |
176 | sr2 = debug_atomic_read(&redundant_softirqs_off); | |
177 | ||
178 | seq_printf(m, " chain lookup misses: %11u\n", | |
179 | debug_atomic_read(&chain_lookup_misses)); | |
180 | seq_printf(m, " chain lookup hits: %11u\n", | |
181 | debug_atomic_read(&chain_lookup_hits)); | |
182 | seq_printf(m, " cyclic checks: %11u\n", | |
183 | debug_atomic_read(&nr_cyclic_checks)); | |
184 | seq_printf(m, " cyclic-check recursions: %11u\n", | |
185 | debug_atomic_read(&nr_cyclic_check_recursions)); | |
186 | seq_printf(m, " find-mask forwards checks: %11u\n", | |
187 | debug_atomic_read(&nr_find_usage_forwards_checks)); | |
188 | seq_printf(m, " find-mask forwards recursions: %11u\n", | |
189 | debug_atomic_read(&nr_find_usage_forwards_recursions)); | |
190 | seq_printf(m, " find-mask backwards checks: %11u\n", | |
191 | debug_atomic_read(&nr_find_usage_backwards_checks)); | |
192 | seq_printf(m, " find-mask backwards recursions:%11u\n", | |
193 | debug_atomic_read(&nr_find_usage_backwards_recursions)); | |
194 | ||
195 | seq_printf(m, " hardirq on events: %11u\n", hi1); | |
196 | seq_printf(m, " hardirq off events: %11u\n", hi2); | |
197 | seq_printf(m, " redundant hardirq ons: %11u\n", hr1); | |
198 | seq_printf(m, " redundant hardirq offs: %11u\n", hr2); | |
199 | seq_printf(m, " softirq on events: %11u\n", si1); | |
200 | seq_printf(m, " softirq off events: %11u\n", si2); | |
201 | seq_printf(m, " redundant softirq ons: %11u\n", sr1); | |
202 | seq_printf(m, " redundant softirq offs: %11u\n", sr2); | |
203 | #endif | |
204 | } | |
205 | ||
206 | static int lockdep_stats_show(struct seq_file *m, void *v) | |
207 | { | |
208 | struct lock_class *class; | |
209 | unsigned long nr_unused = 0, nr_uncategorized = 0, | |
210 | nr_irq_safe = 0, nr_irq_unsafe = 0, | |
211 | nr_softirq_safe = 0, nr_softirq_unsafe = 0, | |
212 | nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, | |
213 | nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, | |
214 | nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, | |
215 | nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, | |
216 | sum_forward_deps = 0, factor = 0; | |
217 | ||
218 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
219 | ||
220 | if (class->usage_mask == 0) | |
221 | nr_unused++; | |
222 | if (class->usage_mask == LOCKF_USED) | |
223 | nr_uncategorized++; | |
224 | if (class->usage_mask & LOCKF_USED_IN_IRQ) | |
225 | nr_irq_safe++; | |
226 | if (class->usage_mask & LOCKF_ENABLED_IRQS) | |
227 | nr_irq_unsafe++; | |
228 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) | |
229 | nr_softirq_safe++; | |
230 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS) | |
231 | nr_softirq_unsafe++; | |
232 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) | |
233 | nr_hardirq_safe++; | |
234 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQS) | |
235 | nr_hardirq_unsafe++; | |
236 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) | |
237 | nr_irq_read_safe++; | |
238 | if (class->usage_mask & LOCKF_ENABLED_IRQS_READ) | |
239 | nr_irq_read_unsafe++; | |
240 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) | |
241 | nr_softirq_read_safe++; | |
242 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS_READ) | |
243 | nr_softirq_read_unsafe++; | |
244 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) | |
245 | nr_hardirq_read_safe++; | |
246 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQS_READ) | |
247 | nr_hardirq_read_unsafe++; | |
248 | ||
249 | sum_forward_deps += count_forward_deps(class); | |
250 | } | |
501b9ebf | 251 | #ifdef CONFIG_DEBUG_LOCKDEP |
a8f24a39 IM |
252 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(&nr_unused_locks) != nr_unused); |
253 | #endif | |
254 | seq_printf(m, " lock-classes: %11lu [max: %lu]\n", | |
255 | nr_lock_classes, MAX_LOCKDEP_KEYS); | |
256 | seq_printf(m, " direct dependencies: %11lu [max: %lu]\n", | |
257 | nr_list_entries, MAX_LOCKDEP_ENTRIES); | |
258 | seq_printf(m, " indirect dependencies: %11lu\n", | |
259 | sum_forward_deps); | |
260 | ||
261 | /* | |
262 | * Total number of dependencies: | |
263 | * | |
264 | * All irq-safe locks may nest inside irq-unsafe locks, | |
265 | * plus all the other known dependencies: | |
266 | */ | |
267 | seq_printf(m, " all direct dependencies: %11lu\n", | |
268 | nr_irq_unsafe * nr_irq_safe + | |
269 | nr_hardirq_unsafe * nr_hardirq_safe + | |
270 | nr_list_entries); | |
271 | ||
272 | /* | |
273 | * Estimated factor between direct and indirect | |
274 | * dependencies: | |
275 | */ | |
276 | if (nr_list_entries) | |
277 | factor = sum_forward_deps / nr_list_entries; | |
278 | ||
8e18257d | 279 | #ifdef CONFIG_PROVE_LOCKING |
a8f24a39 IM |
280 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n", |
281 | nr_lock_chains, MAX_LOCKDEP_CHAINS); | |
8e18257d | 282 | #endif |
a8f24a39 IM |
283 | |
284 | #ifdef CONFIG_TRACE_IRQFLAGS | |
285 | seq_printf(m, " in-hardirq chains: %11u\n", | |
286 | nr_hardirq_chains); | |
287 | seq_printf(m, " in-softirq chains: %11u\n", | |
288 | nr_softirq_chains); | |
289 | #endif | |
290 | seq_printf(m, " in-process chains: %11u\n", | |
291 | nr_process_chains); | |
292 | seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n", | |
293 | nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); | |
294 | seq_printf(m, " combined max dependencies: %11u\n", | |
295 | (nr_hardirq_chains + 1) * | |
296 | (nr_softirq_chains + 1) * | |
297 | (nr_process_chains + 1) | |
298 | ); | |
299 | seq_printf(m, " hardirq-safe locks: %11lu\n", | |
300 | nr_hardirq_safe); | |
301 | seq_printf(m, " hardirq-unsafe locks: %11lu\n", | |
302 | nr_hardirq_unsafe); | |
303 | seq_printf(m, " softirq-safe locks: %11lu\n", | |
304 | nr_softirq_safe); | |
305 | seq_printf(m, " softirq-unsafe locks: %11lu\n", | |
306 | nr_softirq_unsafe); | |
307 | seq_printf(m, " irq-safe locks: %11lu\n", | |
308 | nr_irq_safe); | |
309 | seq_printf(m, " irq-unsafe locks: %11lu\n", | |
310 | nr_irq_unsafe); | |
311 | ||
312 | seq_printf(m, " hardirq-read-safe locks: %11lu\n", | |
313 | nr_hardirq_read_safe); | |
314 | seq_printf(m, " hardirq-read-unsafe locks: %11lu\n", | |
315 | nr_hardirq_read_unsafe); | |
316 | seq_printf(m, " softirq-read-safe locks: %11lu\n", | |
317 | nr_softirq_read_safe); | |
318 | seq_printf(m, " softirq-read-unsafe locks: %11lu\n", | |
319 | nr_softirq_read_unsafe); | |
320 | seq_printf(m, " irq-read-safe locks: %11lu\n", | |
321 | nr_irq_read_safe); | |
322 | seq_printf(m, " irq-read-unsafe locks: %11lu\n", | |
323 | nr_irq_read_unsafe); | |
324 | ||
325 | seq_printf(m, " uncategorized locks: %11lu\n", | |
326 | nr_uncategorized); | |
327 | seq_printf(m, " unused locks: %11lu\n", | |
328 | nr_unused); | |
329 | seq_printf(m, " max locking depth: %11u\n", | |
330 | max_lockdep_depth); | |
331 | seq_printf(m, " max recursion depth: %11u\n", | |
332 | max_recursion_depth); | |
333 | lockdep_stats_debug_show(m); | |
334 | seq_printf(m, " debug_locks: %11u\n", | |
335 | debug_locks); | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | static int lockdep_stats_open(struct inode *inode, struct file *file) | |
341 | { | |
342 | return single_open(file, lockdep_stats_show, NULL); | |
343 | } | |
344 | ||
15ad7cdc | 345 | static const struct file_operations proc_lockdep_stats_operations = { |
a8f24a39 IM |
346 | .open = lockdep_stats_open, |
347 | .read = seq_read, | |
348 | .llseek = seq_lseek, | |
349 | .release = seq_release, | |
350 | }; | |
351 | ||
c46261de PZ |
352 | #ifdef CONFIG_LOCK_STAT |
353 | ||
354 | struct lock_stat_data { | |
355 | struct lock_class *class; | |
356 | struct lock_class_stats stats; | |
357 | }; | |
358 | ||
359 | struct lock_stat_seq { | |
360 | struct lock_stat_data *iter; | |
361 | struct lock_stat_data *iter_end; | |
362 | struct lock_stat_data stats[MAX_LOCKDEP_KEYS]; | |
363 | }; | |
364 | ||
365 | /* | |
366 | * sort on absolute number of contentions | |
367 | */ | |
368 | static int lock_stat_cmp(const void *l, const void *r) | |
369 | { | |
370 | const struct lock_stat_data *dl = l, *dr = r; | |
371 | unsigned long nl, nr; | |
372 | ||
373 | nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr; | |
374 | nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr; | |
375 | ||
376 | return nr - nl; | |
377 | } | |
378 | ||
379 | static void seq_line(struct seq_file *m, char c, int offset, int length) | |
380 | { | |
381 | int i; | |
382 | ||
383 | for (i = 0; i < offset; i++) | |
384 | seq_puts(m, " "); | |
385 | for (i = 0; i < length; i++) | |
386 | seq_printf(m, "%c", c); | |
387 | seq_puts(m, "\n"); | |
388 | } | |
389 | ||
390 | static void snprint_time(char *buf, size_t bufsiz, s64 nr) | |
391 | { | |
392 | unsigned long rem; | |
393 | ||
394 | rem = do_div(nr, 1000); /* XXX: do_div_signed */ | |
395 | snprintf(buf, bufsiz, "%lld.%02d", (long long)nr, ((int)rem+5)/10); | |
396 | } | |
397 | ||
398 | static void seq_time(struct seq_file *m, s64 time) | |
399 | { | |
400 | char num[15]; | |
401 | ||
402 | snprint_time(num, sizeof(num), time); | |
403 | seq_printf(m, " %14s", num); | |
404 | } | |
405 | ||
406 | static void seq_lock_time(struct seq_file *m, struct lock_time *lt) | |
407 | { | |
408 | seq_printf(m, "%14lu", lt->nr); | |
409 | seq_time(m, lt->min); | |
410 | seq_time(m, lt->max); | |
411 | seq_time(m, lt->total); | |
412 | } | |
413 | ||
414 | static void seq_stats(struct seq_file *m, struct lock_stat_data *data) | |
415 | { | |
416 | char name[39]; | |
417 | struct lock_class *class; | |
418 | struct lock_class_stats *stats; | |
419 | int i, namelen; | |
420 | ||
421 | class = data->class; | |
422 | stats = &data->stats; | |
423 | ||
d38e1d5a PZ |
424 | namelen = 38; |
425 | if (class->name_version > 1) | |
426 | namelen -= 2; /* XXX truncates versions > 9 */ | |
427 | if (class->subclass) | |
428 | namelen -= 2; | |
429 | ||
430 | if (!class->name) { | |
431 | char str[KSYM_NAME_LEN]; | |
432 | const char *key_name; | |
433 | ||
434 | key_name = __get_key_name(class->key, str); | |
435 | snprintf(name, namelen, "%s", key_name); | |
436 | } else { | |
437 | snprintf(name, namelen, "%s", class->name); | |
438 | } | |
c46261de | 439 | namelen = strlen(name); |
d38e1d5a PZ |
440 | if (class->name_version > 1) { |
441 | snprintf(name+namelen, 3, "#%d", class->name_version); | |
442 | namelen += 2; | |
443 | } | |
444 | if (class->subclass) { | |
445 | snprintf(name+namelen, 3, "/%d", class->subclass); | |
446 | namelen += 2; | |
447 | } | |
c46261de PZ |
448 | |
449 | if (stats->write_holdtime.nr) { | |
450 | if (stats->read_holdtime.nr) | |
451 | seq_printf(m, "%38s-W:", name); | |
452 | else | |
453 | seq_printf(m, "%40s:", name); | |
454 | ||
96645678 | 455 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); |
c46261de | 456 | seq_lock_time(m, &stats->write_waittime); |
96645678 | 457 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); |
c46261de PZ |
458 | seq_lock_time(m, &stats->write_holdtime); |
459 | seq_puts(m, "\n"); | |
460 | } | |
461 | ||
462 | if (stats->read_holdtime.nr) { | |
463 | seq_printf(m, "%38s-R:", name); | |
96645678 | 464 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); |
c46261de | 465 | seq_lock_time(m, &stats->read_waittime); |
96645678 | 466 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); |
c46261de PZ |
467 | seq_lock_time(m, &stats->read_holdtime); |
468 | seq_puts(m, "\n"); | |
469 | } | |
470 | ||
471 | if (stats->read_waittime.nr + stats->write_waittime.nr == 0) | |
472 | return; | |
473 | ||
474 | if (stats->read_holdtime.nr) | |
475 | namelen += 2; | |
476 | ||
477 | for (i = 0; i < ARRAY_SIZE(class->contention_point); i++) { | |
478 | char sym[KSYM_SYMBOL_LEN]; | |
479 | char ip[32]; | |
480 | ||
481 | if (class->contention_point[i] == 0) | |
482 | break; | |
483 | ||
484 | if (!i) | |
485 | seq_line(m, '-', 40-namelen, namelen); | |
486 | ||
487 | sprint_symbol(sym, class->contention_point[i]); | |
488 | snprintf(ip, sizeof(ip), "[<%p>]", | |
489 | (void *)class->contention_point[i]); | |
490 | seq_printf(m, "%40s %14lu %29s %s\n", name, | |
491 | stats->contention_point[i], | |
492 | ip, sym); | |
493 | } | |
494 | if (i) { | |
495 | seq_puts(m, "\n"); | |
96645678 | 496 | seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1)); |
c46261de PZ |
497 | seq_puts(m, "\n"); |
498 | } | |
499 | } | |
500 | ||
501 | static void seq_header(struct seq_file *m) | |
502 | { | |
96645678 PZ |
503 | seq_printf(m, "lock_stat version 0.2\n"); |
504 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); | |
505 | seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s " | |
506 | "%14s %14s\n", | |
c46261de | 507 | "class name", |
96645678 | 508 | "con-bounces", |
c46261de PZ |
509 | "contentions", |
510 | "waittime-min", | |
511 | "waittime-max", | |
512 | "waittime-total", | |
96645678 | 513 | "acq-bounces", |
c46261de PZ |
514 | "acquisitions", |
515 | "holdtime-min", | |
516 | "holdtime-max", | |
517 | "holdtime-total"); | |
96645678 | 518 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); |
c46261de PZ |
519 | seq_printf(m, "\n"); |
520 | } | |
521 | ||
522 | static void *ls_start(struct seq_file *m, loff_t *pos) | |
523 | { | |
524 | struct lock_stat_seq *data = m->private; | |
525 | ||
526 | if (data->iter == data->stats) | |
527 | seq_header(m); | |
528 | ||
4b32d0a4 PZ |
529 | if (data->iter == data->iter_end) |
530 | data->iter = NULL; | |
531 | ||
c46261de PZ |
532 | return data->iter; |
533 | } | |
534 | ||
535 | static void *ls_next(struct seq_file *m, void *v, loff_t *pos) | |
536 | { | |
537 | struct lock_stat_seq *data = m->private; | |
538 | ||
539 | (*pos)++; | |
540 | ||
541 | data->iter = v; | |
542 | data->iter++; | |
543 | if (data->iter == data->iter_end) | |
544 | data->iter = NULL; | |
545 | ||
546 | return data->iter; | |
547 | } | |
548 | ||
549 | static void ls_stop(struct seq_file *m, void *v) | |
550 | { | |
551 | } | |
552 | ||
553 | static int ls_show(struct seq_file *m, void *v) | |
554 | { | |
555 | struct lock_stat_seq *data = m->private; | |
556 | ||
557 | seq_stats(m, data->iter); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | static struct seq_operations lockstat_ops = { | |
562 | .start = ls_start, | |
563 | .next = ls_next, | |
564 | .stop = ls_stop, | |
565 | .show = ls_show, | |
566 | }; | |
567 | ||
568 | static int lock_stat_open(struct inode *inode, struct file *file) | |
569 | { | |
570 | int res; | |
571 | struct lock_class *class; | |
572 | struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); | |
573 | ||
574 | if (!data) | |
575 | return -ENOMEM; | |
576 | ||
577 | res = seq_open(file, &lockstat_ops); | |
578 | if (!res) { | |
579 | struct lock_stat_data *iter = data->stats; | |
580 | struct seq_file *m = file->private_data; | |
581 | ||
582 | data->iter = iter; | |
583 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
584 | iter->class = class; | |
585 | iter->stats = lock_stats(class); | |
586 | iter++; | |
587 | } | |
588 | data->iter_end = iter; | |
589 | ||
590 | sort(data->stats, data->iter_end - data->iter, | |
591 | sizeof(struct lock_stat_data), | |
592 | lock_stat_cmp, NULL); | |
593 | ||
594 | m->private = data; | |
595 | } else | |
596 | vfree(data); | |
597 | ||
598 | return res; | |
599 | } | |
600 | ||
601 | static ssize_t lock_stat_write(struct file *file, const char __user *buf, | |
602 | size_t count, loff_t *ppos) | |
603 | { | |
604 | struct lock_class *class; | |
605 | char c; | |
606 | ||
607 | if (count) { | |
608 | if (get_user(c, buf)) | |
609 | return -EFAULT; | |
610 | ||
611 | if (c != '0') | |
612 | return count; | |
613 | ||
614 | list_for_each_entry(class, &all_lock_classes, lock_entry) | |
615 | clear_lock_stats(class); | |
616 | } | |
617 | return count; | |
618 | } | |
619 | ||
620 | static int lock_stat_release(struct inode *inode, struct file *file) | |
621 | { | |
622 | struct seq_file *seq = file->private_data; | |
623 | ||
624 | vfree(seq->private); | |
625 | seq->private = NULL; | |
626 | return seq_release(inode, file); | |
627 | } | |
628 | ||
629 | static const struct file_operations proc_lock_stat_operations = { | |
630 | .open = lock_stat_open, | |
631 | .write = lock_stat_write, | |
632 | .read = seq_read, | |
633 | .llseek = seq_lseek, | |
634 | .release = lock_stat_release, | |
635 | }; | |
636 | #endif /* CONFIG_LOCK_STAT */ | |
637 | ||
a8f24a39 IM |
638 | static int __init lockdep_proc_init(void) |
639 | { | |
640 | struct proc_dir_entry *entry; | |
641 | ||
642 | entry = create_proc_entry("lockdep", S_IRUSR, NULL); | |
643 | if (entry) | |
644 | entry->proc_fops = &proc_lockdep_operations; | |
645 | ||
646 | entry = create_proc_entry("lockdep_stats", S_IRUSR, NULL); | |
647 | if (entry) | |
648 | entry->proc_fops = &proc_lockdep_stats_operations; | |
649 | ||
c46261de PZ |
650 | #ifdef CONFIG_LOCK_STAT |
651 | entry = create_proc_entry("lock_stat", S_IRUSR, NULL); | |
652 | if (entry) | |
653 | entry->proc_fops = &proc_lock_stat_operations; | |
654 | #endif | |
655 | ||
a8f24a39 IM |
656 | return 0; |
657 | } | |
658 | ||
659 | __initcall(lockdep_proc_init); | |
660 |