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 | { | |
94c61c0a | 28 | struct lock_class *class; |
a8f24a39 IM |
29 | |
30 | (*pos)++; | |
31 | ||
94c61c0a TP |
32 | if (v == SEQ_START_TOKEN) |
33 | class = m->private; | |
34 | else { | |
35 | class = v; | |
36 | ||
37 | if (class->lock_entry.next != &all_lock_classes) | |
38 | class = list_entry(class->lock_entry.next, | |
39 | struct lock_class, lock_entry); | |
40 | else | |
41 | class = NULL; | |
42 | } | |
a8f24a39 IM |
43 | |
44 | return class; | |
45 | } | |
46 | ||
47 | static void *l_start(struct seq_file *m, loff_t *pos) | |
48 | { | |
94c61c0a TP |
49 | struct lock_class *class; |
50 | loff_t i = 0; | |
a8f24a39 | 51 | |
94c61c0a TP |
52 | if (*pos == 0) |
53 | return SEQ_START_TOKEN; | |
a8f24a39 | 54 | |
94c61c0a TP |
55 | list_for_each_entry(class, &all_lock_classes, lock_entry) { |
56 | if (++i == *pos) | |
57 | return class; | |
58 | } | |
59 | return NULL; | |
a8f24a39 IM |
60 | } |
61 | ||
62 | static void l_stop(struct seq_file *m, void *v) | |
63 | { | |
64 | } | |
65 | ||
66 | static unsigned long count_forward_deps(struct lock_class *class) | |
67 | { | |
68 | struct lock_list *entry; | |
69 | unsigned long ret = 1; | |
70 | ||
71 | /* | |
72 | * Recurse this class's dependency list: | |
73 | */ | |
74 | list_for_each_entry(entry, &class->locks_after, entry) | |
75 | ret += count_forward_deps(entry->class); | |
76 | ||
77 | return ret; | |
78 | } | |
79 | ||
80 | static unsigned long count_backward_deps(struct lock_class *class) | |
81 | { | |
82 | struct lock_list *entry; | |
83 | unsigned long ret = 1; | |
84 | ||
85 | /* | |
86 | * Recurse this class's dependency list: | |
87 | */ | |
88 | list_for_each_entry(entry, &class->locks_before, entry) | |
89 | ret += count_backward_deps(entry->class); | |
90 | ||
91 | return ret; | |
92 | } | |
93 | ||
068135e6 JB |
94 | static void print_name(struct seq_file *m, struct lock_class *class) |
95 | { | |
96 | char str[128]; | |
97 | const char *name = class->name; | |
98 | ||
99 | if (!name) { | |
100 | name = __get_key_name(class->key, str); | |
101 | seq_printf(m, "%s", name); | |
102 | } else{ | |
103 | seq_printf(m, "%s", name); | |
104 | if (class->name_version > 1) | |
105 | seq_printf(m, "#%d", class->name_version); | |
106 | if (class->subclass) | |
107 | seq_printf(m, "/%d", class->subclass); | |
108 | } | |
109 | } | |
110 | ||
a8f24a39 IM |
111 | static int l_show(struct seq_file *m, void *v) |
112 | { | |
113 | unsigned long nr_forward_deps, nr_backward_deps; | |
94c61c0a | 114 | struct lock_class *class = v; |
068135e6 JB |
115 | struct lock_list *entry; |
116 | char c1, c2, c3, c4; | |
a8f24a39 | 117 | |
94c61c0a TP |
118 | if (v == SEQ_START_TOKEN) { |
119 | seq_printf(m, "all lock classes:\n"); | |
120 | return 0; | |
121 | } | |
122 | ||
a8f24a39 IM |
123 | seq_printf(m, "%p", class->key); |
124 | #ifdef CONFIG_DEBUG_LOCKDEP | |
125 | seq_printf(m, " OPS:%8ld", class->ops); | |
126 | #endif | |
127 | nr_forward_deps = count_forward_deps(class); | |
128 | seq_printf(m, " FD:%5ld", nr_forward_deps); | |
129 | ||
130 | nr_backward_deps = count_backward_deps(class); | |
131 | seq_printf(m, " BD:%5ld", nr_backward_deps); | |
132 | ||
133 | get_usage_chars(class, &c1, &c2, &c3, &c4); | |
134 | seq_printf(m, " %c%c%c%c", c1, c2, c3, c4); | |
135 | ||
068135e6 JB |
136 | seq_printf(m, ": "); |
137 | print_name(m, class); | |
138 | seq_puts(m, "\n"); | |
139 | ||
140 | list_for_each_entry(entry, &class->locks_after, entry) { | |
141 | if (entry->distance == 1) { | |
142 | seq_printf(m, " -> [%p] ", entry->class); | |
143 | print_name(m, entry->class); | |
144 | seq_puts(m, "\n"); | |
145 | } | |
a8f24a39 IM |
146 | } |
147 | seq_puts(m, "\n"); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
15ad7cdc | 152 | static const struct seq_operations lockdep_ops = { |
a8f24a39 IM |
153 | .start = l_start, |
154 | .next = l_next, | |
155 | .stop = l_stop, | |
156 | .show = l_show, | |
157 | }; | |
158 | ||
159 | static int lockdep_open(struct inode *inode, struct file *file) | |
160 | { | |
161 | int res = seq_open(file, &lockdep_ops); | |
162 | if (!res) { | |
163 | struct seq_file *m = file->private_data; | |
164 | ||
165 | if (!list_empty(&all_lock_classes)) | |
166 | m->private = list_entry(all_lock_classes.next, | |
167 | struct lock_class, lock_entry); | |
168 | else | |
169 | m->private = NULL; | |
170 | } | |
171 | return res; | |
172 | } | |
173 | ||
15ad7cdc | 174 | static const struct file_operations proc_lockdep_operations = { |
a8f24a39 IM |
175 | .open = lockdep_open, |
176 | .read = seq_read, | |
177 | .llseek = seq_lseek, | |
178 | .release = seq_release, | |
179 | }; | |
180 | ||
181 | static void lockdep_stats_debug_show(struct seq_file *m) | |
182 | { | |
183 | #ifdef CONFIG_DEBUG_LOCKDEP | |
184 | unsigned int hi1 = debug_atomic_read(&hardirqs_on_events), | |
185 | hi2 = debug_atomic_read(&hardirqs_off_events), | |
186 | hr1 = debug_atomic_read(&redundant_hardirqs_on), | |
187 | hr2 = debug_atomic_read(&redundant_hardirqs_off), | |
188 | si1 = debug_atomic_read(&softirqs_on_events), | |
189 | si2 = debug_atomic_read(&softirqs_off_events), | |
190 | sr1 = debug_atomic_read(&redundant_softirqs_on), | |
191 | sr2 = debug_atomic_read(&redundant_softirqs_off); | |
192 | ||
193 | seq_printf(m, " chain lookup misses: %11u\n", | |
194 | debug_atomic_read(&chain_lookup_misses)); | |
195 | seq_printf(m, " chain lookup hits: %11u\n", | |
196 | debug_atomic_read(&chain_lookup_hits)); | |
197 | seq_printf(m, " cyclic checks: %11u\n", | |
198 | debug_atomic_read(&nr_cyclic_checks)); | |
199 | seq_printf(m, " cyclic-check recursions: %11u\n", | |
200 | debug_atomic_read(&nr_cyclic_check_recursions)); | |
201 | seq_printf(m, " find-mask forwards checks: %11u\n", | |
202 | debug_atomic_read(&nr_find_usage_forwards_checks)); | |
203 | seq_printf(m, " find-mask forwards recursions: %11u\n", | |
204 | debug_atomic_read(&nr_find_usage_forwards_recursions)); | |
205 | seq_printf(m, " find-mask backwards checks: %11u\n", | |
206 | debug_atomic_read(&nr_find_usage_backwards_checks)); | |
207 | seq_printf(m, " find-mask backwards recursions:%11u\n", | |
208 | debug_atomic_read(&nr_find_usage_backwards_recursions)); | |
209 | ||
210 | seq_printf(m, " hardirq on events: %11u\n", hi1); | |
211 | seq_printf(m, " hardirq off events: %11u\n", hi2); | |
212 | seq_printf(m, " redundant hardirq ons: %11u\n", hr1); | |
213 | seq_printf(m, " redundant hardirq offs: %11u\n", hr2); | |
214 | seq_printf(m, " softirq on events: %11u\n", si1); | |
215 | seq_printf(m, " softirq off events: %11u\n", si2); | |
216 | seq_printf(m, " redundant softirq ons: %11u\n", sr1); | |
217 | seq_printf(m, " redundant softirq offs: %11u\n", sr2); | |
218 | #endif | |
219 | } | |
220 | ||
221 | static int lockdep_stats_show(struct seq_file *m, void *v) | |
222 | { | |
223 | struct lock_class *class; | |
224 | unsigned long nr_unused = 0, nr_uncategorized = 0, | |
225 | nr_irq_safe = 0, nr_irq_unsafe = 0, | |
226 | nr_softirq_safe = 0, nr_softirq_unsafe = 0, | |
227 | nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, | |
228 | nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, | |
229 | nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, | |
230 | nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, | |
231 | sum_forward_deps = 0, factor = 0; | |
232 | ||
233 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
234 | ||
235 | if (class->usage_mask == 0) | |
236 | nr_unused++; | |
237 | if (class->usage_mask == LOCKF_USED) | |
238 | nr_uncategorized++; | |
239 | if (class->usage_mask & LOCKF_USED_IN_IRQ) | |
240 | nr_irq_safe++; | |
241 | if (class->usage_mask & LOCKF_ENABLED_IRQS) | |
242 | nr_irq_unsafe++; | |
243 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) | |
244 | nr_softirq_safe++; | |
245 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS) | |
246 | nr_softirq_unsafe++; | |
247 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) | |
248 | nr_hardirq_safe++; | |
249 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQS) | |
250 | nr_hardirq_unsafe++; | |
251 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) | |
252 | nr_irq_read_safe++; | |
253 | if (class->usage_mask & LOCKF_ENABLED_IRQS_READ) | |
254 | nr_irq_read_unsafe++; | |
255 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) | |
256 | nr_softirq_read_safe++; | |
257 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS_READ) | |
258 | nr_softirq_read_unsafe++; | |
259 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) | |
260 | nr_hardirq_read_safe++; | |
261 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQS_READ) | |
262 | nr_hardirq_read_unsafe++; | |
263 | ||
264 | sum_forward_deps += count_forward_deps(class); | |
265 | } | |
501b9ebf | 266 | #ifdef CONFIG_DEBUG_LOCKDEP |
a8f24a39 IM |
267 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(&nr_unused_locks) != nr_unused); |
268 | #endif | |
269 | seq_printf(m, " lock-classes: %11lu [max: %lu]\n", | |
270 | nr_lock_classes, MAX_LOCKDEP_KEYS); | |
271 | seq_printf(m, " direct dependencies: %11lu [max: %lu]\n", | |
272 | nr_list_entries, MAX_LOCKDEP_ENTRIES); | |
273 | seq_printf(m, " indirect dependencies: %11lu\n", | |
274 | sum_forward_deps); | |
275 | ||
276 | /* | |
277 | * Total number of dependencies: | |
278 | * | |
279 | * All irq-safe locks may nest inside irq-unsafe locks, | |
280 | * plus all the other known dependencies: | |
281 | */ | |
282 | seq_printf(m, " all direct dependencies: %11lu\n", | |
283 | nr_irq_unsafe * nr_irq_safe + | |
284 | nr_hardirq_unsafe * nr_hardirq_safe + | |
285 | nr_list_entries); | |
286 | ||
287 | /* | |
288 | * Estimated factor between direct and indirect | |
289 | * dependencies: | |
290 | */ | |
291 | if (nr_list_entries) | |
292 | factor = sum_forward_deps / nr_list_entries; | |
293 | ||
8e18257d | 294 | #ifdef CONFIG_PROVE_LOCKING |
a8f24a39 IM |
295 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n", |
296 | nr_lock_chains, MAX_LOCKDEP_CHAINS); | |
8e18257d | 297 | #endif |
a8f24a39 IM |
298 | |
299 | #ifdef CONFIG_TRACE_IRQFLAGS | |
300 | seq_printf(m, " in-hardirq chains: %11u\n", | |
301 | nr_hardirq_chains); | |
302 | seq_printf(m, " in-softirq chains: %11u\n", | |
303 | nr_softirq_chains); | |
304 | #endif | |
305 | seq_printf(m, " in-process chains: %11u\n", | |
306 | nr_process_chains); | |
307 | seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n", | |
308 | nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); | |
309 | seq_printf(m, " combined max dependencies: %11u\n", | |
310 | (nr_hardirq_chains + 1) * | |
311 | (nr_softirq_chains + 1) * | |
312 | (nr_process_chains + 1) | |
313 | ); | |
314 | seq_printf(m, " hardirq-safe locks: %11lu\n", | |
315 | nr_hardirq_safe); | |
316 | seq_printf(m, " hardirq-unsafe locks: %11lu\n", | |
317 | nr_hardirq_unsafe); | |
318 | seq_printf(m, " softirq-safe locks: %11lu\n", | |
319 | nr_softirq_safe); | |
320 | seq_printf(m, " softirq-unsafe locks: %11lu\n", | |
321 | nr_softirq_unsafe); | |
322 | seq_printf(m, " irq-safe locks: %11lu\n", | |
323 | nr_irq_safe); | |
324 | seq_printf(m, " irq-unsafe locks: %11lu\n", | |
325 | nr_irq_unsafe); | |
326 | ||
327 | seq_printf(m, " hardirq-read-safe locks: %11lu\n", | |
328 | nr_hardirq_read_safe); | |
329 | seq_printf(m, " hardirq-read-unsafe locks: %11lu\n", | |
330 | nr_hardirq_read_unsafe); | |
331 | seq_printf(m, " softirq-read-safe locks: %11lu\n", | |
332 | nr_softirq_read_safe); | |
333 | seq_printf(m, " softirq-read-unsafe locks: %11lu\n", | |
334 | nr_softirq_read_unsafe); | |
335 | seq_printf(m, " irq-read-safe locks: %11lu\n", | |
336 | nr_irq_read_safe); | |
337 | seq_printf(m, " irq-read-unsafe locks: %11lu\n", | |
338 | nr_irq_read_unsafe); | |
339 | ||
340 | seq_printf(m, " uncategorized locks: %11lu\n", | |
341 | nr_uncategorized); | |
342 | seq_printf(m, " unused locks: %11lu\n", | |
343 | nr_unused); | |
344 | seq_printf(m, " max locking depth: %11u\n", | |
345 | max_lockdep_depth); | |
346 | seq_printf(m, " max recursion depth: %11u\n", | |
347 | max_recursion_depth); | |
348 | lockdep_stats_debug_show(m); | |
349 | seq_printf(m, " debug_locks: %11u\n", | |
350 | debug_locks); | |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
355 | static int lockdep_stats_open(struct inode *inode, struct file *file) | |
356 | { | |
357 | return single_open(file, lockdep_stats_show, NULL); | |
358 | } | |
359 | ||
15ad7cdc | 360 | static const struct file_operations proc_lockdep_stats_operations = { |
a8f24a39 IM |
361 | .open = lockdep_stats_open, |
362 | .read = seq_read, | |
363 | .llseek = seq_lseek, | |
c0f33586 | 364 | .release = single_release, |
a8f24a39 IM |
365 | }; |
366 | ||
c46261de PZ |
367 | #ifdef CONFIG_LOCK_STAT |
368 | ||
369 | struct lock_stat_data { | |
370 | struct lock_class *class; | |
371 | struct lock_class_stats stats; | |
372 | }; | |
373 | ||
374 | struct lock_stat_seq { | |
375 | struct lock_stat_data *iter; | |
376 | struct lock_stat_data *iter_end; | |
377 | struct lock_stat_data stats[MAX_LOCKDEP_KEYS]; | |
378 | }; | |
379 | ||
380 | /* | |
381 | * sort on absolute number of contentions | |
382 | */ | |
383 | static int lock_stat_cmp(const void *l, const void *r) | |
384 | { | |
385 | const struct lock_stat_data *dl = l, *dr = r; | |
386 | unsigned long nl, nr; | |
387 | ||
388 | nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr; | |
389 | nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr; | |
390 | ||
391 | return nr - nl; | |
392 | } | |
393 | ||
394 | static void seq_line(struct seq_file *m, char c, int offset, int length) | |
395 | { | |
396 | int i; | |
397 | ||
398 | for (i = 0; i < offset; i++) | |
399 | seq_puts(m, " "); | |
400 | for (i = 0; i < length; i++) | |
401 | seq_printf(m, "%c", c); | |
402 | seq_puts(m, "\n"); | |
403 | } | |
404 | ||
405 | static void snprint_time(char *buf, size_t bufsiz, s64 nr) | |
406 | { | |
407 | unsigned long rem; | |
408 | ||
409 | rem = do_div(nr, 1000); /* XXX: do_div_signed */ | |
410 | snprintf(buf, bufsiz, "%lld.%02d", (long long)nr, ((int)rem+5)/10); | |
411 | } | |
412 | ||
413 | static void seq_time(struct seq_file *m, s64 time) | |
414 | { | |
415 | char num[15]; | |
416 | ||
417 | snprint_time(num, sizeof(num), time); | |
418 | seq_printf(m, " %14s", num); | |
419 | } | |
420 | ||
421 | static void seq_lock_time(struct seq_file *m, struct lock_time *lt) | |
422 | { | |
423 | seq_printf(m, "%14lu", lt->nr); | |
424 | seq_time(m, lt->min); | |
425 | seq_time(m, lt->max); | |
426 | seq_time(m, lt->total); | |
427 | } | |
428 | ||
429 | static void seq_stats(struct seq_file *m, struct lock_stat_data *data) | |
430 | { | |
431 | char name[39]; | |
432 | struct lock_class *class; | |
433 | struct lock_class_stats *stats; | |
434 | int i, namelen; | |
435 | ||
436 | class = data->class; | |
437 | stats = &data->stats; | |
438 | ||
d38e1d5a PZ |
439 | namelen = 38; |
440 | if (class->name_version > 1) | |
441 | namelen -= 2; /* XXX truncates versions > 9 */ | |
442 | if (class->subclass) | |
443 | namelen -= 2; | |
444 | ||
445 | if (!class->name) { | |
446 | char str[KSYM_NAME_LEN]; | |
447 | const char *key_name; | |
448 | ||
449 | key_name = __get_key_name(class->key, str); | |
450 | snprintf(name, namelen, "%s", key_name); | |
451 | } else { | |
452 | snprintf(name, namelen, "%s", class->name); | |
453 | } | |
c46261de | 454 | namelen = strlen(name); |
d38e1d5a PZ |
455 | if (class->name_version > 1) { |
456 | snprintf(name+namelen, 3, "#%d", class->name_version); | |
457 | namelen += 2; | |
458 | } | |
459 | if (class->subclass) { | |
460 | snprintf(name+namelen, 3, "/%d", class->subclass); | |
461 | namelen += 2; | |
462 | } | |
c46261de PZ |
463 | |
464 | if (stats->write_holdtime.nr) { | |
465 | if (stats->read_holdtime.nr) | |
466 | seq_printf(m, "%38s-W:", name); | |
467 | else | |
468 | seq_printf(m, "%40s:", name); | |
469 | ||
96645678 | 470 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); |
c46261de | 471 | seq_lock_time(m, &stats->write_waittime); |
96645678 | 472 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); |
c46261de PZ |
473 | seq_lock_time(m, &stats->write_holdtime); |
474 | seq_puts(m, "\n"); | |
475 | } | |
476 | ||
477 | if (stats->read_holdtime.nr) { | |
478 | seq_printf(m, "%38s-R:", name); | |
96645678 | 479 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); |
c46261de | 480 | seq_lock_time(m, &stats->read_waittime); |
96645678 | 481 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); |
c46261de PZ |
482 | seq_lock_time(m, &stats->read_holdtime); |
483 | seq_puts(m, "\n"); | |
484 | } | |
485 | ||
486 | if (stats->read_waittime.nr + stats->write_waittime.nr == 0) | |
487 | return; | |
488 | ||
489 | if (stats->read_holdtime.nr) | |
490 | namelen += 2; | |
491 | ||
492 | for (i = 0; i < ARRAY_SIZE(class->contention_point); i++) { | |
493 | char sym[KSYM_SYMBOL_LEN]; | |
494 | char ip[32]; | |
495 | ||
496 | if (class->contention_point[i] == 0) | |
497 | break; | |
498 | ||
499 | if (!i) | |
500 | seq_line(m, '-', 40-namelen, namelen); | |
501 | ||
502 | sprint_symbol(sym, class->contention_point[i]); | |
503 | snprintf(ip, sizeof(ip), "[<%p>]", | |
504 | (void *)class->contention_point[i]); | |
505 | seq_printf(m, "%40s %14lu %29s %s\n", name, | |
506 | stats->contention_point[i], | |
507 | ip, sym); | |
508 | } | |
509 | if (i) { | |
510 | seq_puts(m, "\n"); | |
96645678 | 511 | seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1)); |
c46261de PZ |
512 | seq_puts(m, "\n"); |
513 | } | |
514 | } | |
515 | ||
516 | static void seq_header(struct seq_file *m) | |
517 | { | |
96645678 PZ |
518 | seq_printf(m, "lock_stat version 0.2\n"); |
519 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); | |
520 | seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s " | |
521 | "%14s %14s\n", | |
c46261de | 522 | "class name", |
96645678 | 523 | "con-bounces", |
c46261de PZ |
524 | "contentions", |
525 | "waittime-min", | |
526 | "waittime-max", | |
527 | "waittime-total", | |
96645678 | 528 | "acq-bounces", |
c46261de PZ |
529 | "acquisitions", |
530 | "holdtime-min", | |
531 | "holdtime-max", | |
532 | "holdtime-total"); | |
96645678 | 533 | seq_line(m, '-', 0, 40 + 1 + 10 * (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; | |
540 | ||
94c61c0a TP |
541 | if (*pos == 0) |
542 | return SEQ_START_TOKEN; | |
c46261de | 543 | |
94c61c0a TP |
544 | data->iter = data->stats + *pos; |
545 | if (data->iter >= data->iter_end) | |
4b32d0a4 PZ |
546 | data->iter = NULL; |
547 | ||
c46261de PZ |
548 | return data->iter; |
549 | } | |
550 | ||
551 | static void *ls_next(struct seq_file *m, void *v, loff_t *pos) | |
552 | { | |
553 | struct lock_stat_seq *data = m->private; | |
554 | ||
555 | (*pos)++; | |
556 | ||
94c61c0a TP |
557 | if (v == SEQ_START_TOKEN) |
558 | data->iter = data->stats; | |
559 | else { | |
560 | data->iter = v; | |
561 | data->iter++; | |
562 | } | |
563 | ||
c46261de PZ |
564 | if (data->iter == data->iter_end) |
565 | data->iter = NULL; | |
566 | ||
567 | return data->iter; | |
568 | } | |
569 | ||
570 | static void ls_stop(struct seq_file *m, void *v) | |
571 | { | |
572 | } | |
573 | ||
574 | static int ls_show(struct seq_file *m, void *v) | |
575 | { | |
94c61c0a TP |
576 | if (v == SEQ_START_TOKEN) |
577 | seq_header(m); | |
578 | else | |
579 | seq_stats(m, v); | |
c46261de | 580 | |
c46261de PZ |
581 | return 0; |
582 | } | |
583 | ||
584 | static struct seq_operations lockstat_ops = { | |
585 | .start = ls_start, | |
586 | .next = ls_next, | |
587 | .stop = ls_stop, | |
588 | .show = ls_show, | |
589 | }; | |
590 | ||
591 | static int lock_stat_open(struct inode *inode, struct file *file) | |
592 | { | |
593 | int res; | |
594 | struct lock_class *class; | |
595 | struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); | |
596 | ||
597 | if (!data) | |
598 | return -ENOMEM; | |
599 | ||
600 | res = seq_open(file, &lockstat_ops); | |
601 | if (!res) { | |
602 | struct lock_stat_data *iter = data->stats; | |
603 | struct seq_file *m = file->private_data; | |
604 | ||
605 | data->iter = iter; | |
606 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
607 | iter->class = class; | |
608 | iter->stats = lock_stats(class); | |
609 | iter++; | |
610 | } | |
611 | data->iter_end = iter; | |
612 | ||
613 | sort(data->stats, data->iter_end - data->iter, | |
614 | sizeof(struct lock_stat_data), | |
615 | lock_stat_cmp, NULL); | |
616 | ||
617 | m->private = data; | |
618 | } else | |
619 | vfree(data); | |
620 | ||
621 | return res; | |
622 | } | |
623 | ||
624 | static ssize_t lock_stat_write(struct file *file, const char __user *buf, | |
625 | size_t count, loff_t *ppos) | |
626 | { | |
627 | struct lock_class *class; | |
628 | char c; | |
629 | ||
630 | if (count) { | |
631 | if (get_user(c, buf)) | |
632 | return -EFAULT; | |
633 | ||
634 | if (c != '0') | |
635 | return count; | |
636 | ||
637 | list_for_each_entry(class, &all_lock_classes, lock_entry) | |
638 | clear_lock_stats(class); | |
639 | } | |
640 | return count; | |
641 | } | |
642 | ||
643 | static int lock_stat_release(struct inode *inode, struct file *file) | |
644 | { | |
645 | struct seq_file *seq = file->private_data; | |
646 | ||
647 | vfree(seq->private); | |
648 | seq->private = NULL; | |
649 | return seq_release(inode, file); | |
650 | } | |
651 | ||
652 | static const struct file_operations proc_lock_stat_operations = { | |
653 | .open = lock_stat_open, | |
654 | .write = lock_stat_write, | |
655 | .read = seq_read, | |
656 | .llseek = seq_lseek, | |
657 | .release = lock_stat_release, | |
658 | }; | |
659 | #endif /* CONFIG_LOCK_STAT */ | |
660 | ||
a8f24a39 IM |
661 | static int __init lockdep_proc_init(void) |
662 | { | |
663 | struct proc_dir_entry *entry; | |
664 | ||
665 | entry = create_proc_entry("lockdep", S_IRUSR, NULL); | |
666 | if (entry) | |
667 | entry->proc_fops = &proc_lockdep_operations; | |
668 | ||
669 | entry = create_proc_entry("lockdep_stats", S_IRUSR, NULL); | |
670 | if (entry) | |
671 | entry->proc_fops = &proc_lockdep_stats_operations; | |
672 | ||
c46261de PZ |
673 | #ifdef CONFIG_LOCK_STAT |
674 | entry = create_proc_entry("lock_stat", S_IRUSR, NULL); | |
675 | if (entry) | |
676 | entry->proc_fops = &proc_lock_stat_operations; | |
677 | #endif | |
678 | ||
a8f24a39 IM |
679 | return 0; |
680 | } | |
681 | ||
682 | __initcall(lockdep_proc_init); | |
683 |