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 | ||
068135e6 JB |
66 | static void print_name(struct seq_file *m, struct lock_class *class) |
67 | { | |
68 | char str[128]; | |
69 | const char *name = class->name; | |
70 | ||
71 | if (!name) { | |
72 | name = __get_key_name(class->key, str); | |
73 | seq_printf(m, "%s", name); | |
74 | } else{ | |
75 | seq_printf(m, "%s", name); | |
76 | if (class->name_version > 1) | |
77 | seq_printf(m, "#%d", class->name_version); | |
78 | if (class->subclass) | |
79 | seq_printf(m, "/%d", class->subclass); | |
80 | } | |
81 | } | |
82 | ||
a8f24a39 IM |
83 | static int l_show(struct seq_file *m, void *v) |
84 | { | |
94c61c0a | 85 | struct lock_class *class = v; |
068135e6 JB |
86 | struct lock_list *entry; |
87 | char c1, c2, c3, c4; | |
a8f24a39 | 88 | |
94c61c0a TP |
89 | if (v == SEQ_START_TOKEN) { |
90 | seq_printf(m, "all lock classes:\n"); | |
91 | return 0; | |
92 | } | |
93 | ||
a8f24a39 IM |
94 | seq_printf(m, "%p", class->key); |
95 | #ifdef CONFIG_DEBUG_LOCKDEP | |
96 | seq_printf(m, " OPS:%8ld", class->ops); | |
97 | #endif | |
df60a844 SH |
98 | #ifdef CONFIG_PROVE_LOCKING |
99 | seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class)); | |
100 | seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class)); | |
101 | #endif | |
a8f24a39 IM |
102 | |
103 | get_usage_chars(class, &c1, &c2, &c3, &c4); | |
104 | seq_printf(m, " %c%c%c%c", c1, c2, c3, c4); | |
105 | ||
068135e6 JB |
106 | seq_printf(m, ": "); |
107 | print_name(m, class); | |
108 | seq_puts(m, "\n"); | |
109 | ||
110 | list_for_each_entry(entry, &class->locks_after, entry) { | |
111 | if (entry->distance == 1) { | |
2429e4ee | 112 | seq_printf(m, " -> [%p] ", entry->class->key); |
068135e6 JB |
113 | print_name(m, entry->class); |
114 | seq_puts(m, "\n"); | |
115 | } | |
a8f24a39 IM |
116 | } |
117 | seq_puts(m, "\n"); | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
15ad7cdc | 122 | static const struct seq_operations lockdep_ops = { |
a8f24a39 IM |
123 | .start = l_start, |
124 | .next = l_next, | |
125 | .stop = l_stop, | |
126 | .show = l_show, | |
127 | }; | |
128 | ||
129 | static int lockdep_open(struct inode *inode, struct file *file) | |
130 | { | |
131 | int res = seq_open(file, &lockdep_ops); | |
132 | if (!res) { | |
133 | struct seq_file *m = file->private_data; | |
134 | ||
135 | if (!list_empty(&all_lock_classes)) | |
136 | m->private = list_entry(all_lock_classes.next, | |
137 | struct lock_class, lock_entry); | |
138 | else | |
139 | m->private = NULL; | |
140 | } | |
141 | return res; | |
142 | } | |
143 | ||
15ad7cdc | 144 | static const struct file_operations proc_lockdep_operations = { |
a8f24a39 IM |
145 | .open = lockdep_open, |
146 | .read = seq_read, | |
147 | .llseek = seq_lseek, | |
148 | .release = seq_release, | |
149 | }; | |
150 | ||
cd1a28e8 | 151 | #ifdef CONFIG_PROVE_LOCKING |
443cd507 HY |
152 | static void *lc_next(struct seq_file *m, void *v, loff_t *pos) |
153 | { | |
154 | struct lock_chain *chain; | |
155 | ||
156 | (*pos)++; | |
157 | ||
158 | if (v == SEQ_START_TOKEN) | |
159 | chain = m->private; | |
160 | else { | |
161 | chain = v; | |
162 | ||
163 | if (*pos < nr_lock_chains) | |
164 | chain = lock_chains + *pos; | |
165 | else | |
166 | chain = NULL; | |
167 | } | |
168 | ||
169 | return chain; | |
170 | } | |
171 | ||
172 | static void *lc_start(struct seq_file *m, loff_t *pos) | |
173 | { | |
174 | if (*pos == 0) | |
175 | return SEQ_START_TOKEN; | |
176 | ||
177 | if (*pos < nr_lock_chains) | |
178 | return lock_chains + *pos; | |
179 | ||
180 | return NULL; | |
181 | } | |
182 | ||
183 | static void lc_stop(struct seq_file *m, void *v) | |
184 | { | |
185 | } | |
186 | ||
187 | static int lc_show(struct seq_file *m, void *v) | |
188 | { | |
189 | struct lock_chain *chain = v; | |
190 | struct lock_class *class; | |
191 | int i; | |
192 | ||
193 | if (v == SEQ_START_TOKEN) { | |
194 | seq_printf(m, "all lock chains:\n"); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | seq_printf(m, "irq_context: %d\n", chain->irq_context); | |
199 | ||
200 | for (i = 0; i < chain->depth; i++) { | |
201 | class = lock_chain_get_class(chain, i); | |
8bfe0298 RV |
202 | if (!class->key) |
203 | continue; | |
204 | ||
443cd507 HY |
205 | seq_printf(m, "[%p] ", class->key); |
206 | print_name(m, class); | |
207 | seq_puts(m, "\n"); | |
208 | } | |
209 | seq_puts(m, "\n"); | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static const struct seq_operations lockdep_chains_ops = { | |
215 | .start = lc_start, | |
216 | .next = lc_next, | |
217 | .stop = lc_stop, | |
218 | .show = lc_show, | |
219 | }; | |
220 | ||
221 | static int lockdep_chains_open(struct inode *inode, struct file *file) | |
222 | { | |
223 | int res = seq_open(file, &lockdep_chains_ops); | |
224 | if (!res) { | |
225 | struct seq_file *m = file->private_data; | |
226 | ||
227 | if (nr_lock_chains) | |
228 | m->private = lock_chains; | |
229 | else | |
230 | m->private = NULL; | |
231 | } | |
232 | return res; | |
233 | } | |
234 | ||
235 | static const struct file_operations proc_lockdep_chains_operations = { | |
236 | .open = lockdep_chains_open, | |
237 | .read = seq_read, | |
238 | .llseek = seq_lseek, | |
239 | .release = seq_release, | |
240 | }; | |
cd1a28e8 | 241 | #endif /* CONFIG_PROVE_LOCKING */ |
443cd507 | 242 | |
a8f24a39 IM |
243 | static void lockdep_stats_debug_show(struct seq_file *m) |
244 | { | |
245 | #ifdef CONFIG_DEBUG_LOCKDEP | |
246 | unsigned int hi1 = debug_atomic_read(&hardirqs_on_events), | |
247 | hi2 = debug_atomic_read(&hardirqs_off_events), | |
248 | hr1 = debug_atomic_read(&redundant_hardirqs_on), | |
249 | hr2 = debug_atomic_read(&redundant_hardirqs_off), | |
250 | si1 = debug_atomic_read(&softirqs_on_events), | |
251 | si2 = debug_atomic_read(&softirqs_off_events), | |
252 | sr1 = debug_atomic_read(&redundant_softirqs_on), | |
253 | sr2 = debug_atomic_read(&redundant_softirqs_off); | |
254 | ||
255 | seq_printf(m, " chain lookup misses: %11u\n", | |
256 | debug_atomic_read(&chain_lookup_misses)); | |
257 | seq_printf(m, " chain lookup hits: %11u\n", | |
258 | debug_atomic_read(&chain_lookup_hits)); | |
259 | seq_printf(m, " cyclic checks: %11u\n", | |
260 | debug_atomic_read(&nr_cyclic_checks)); | |
261 | seq_printf(m, " cyclic-check recursions: %11u\n", | |
262 | debug_atomic_read(&nr_cyclic_check_recursions)); | |
263 | seq_printf(m, " find-mask forwards checks: %11u\n", | |
264 | debug_atomic_read(&nr_find_usage_forwards_checks)); | |
265 | seq_printf(m, " find-mask forwards recursions: %11u\n", | |
266 | debug_atomic_read(&nr_find_usage_forwards_recursions)); | |
267 | seq_printf(m, " find-mask backwards checks: %11u\n", | |
268 | debug_atomic_read(&nr_find_usage_backwards_checks)); | |
269 | seq_printf(m, " find-mask backwards recursions:%11u\n", | |
270 | debug_atomic_read(&nr_find_usage_backwards_recursions)); | |
271 | ||
272 | seq_printf(m, " hardirq on events: %11u\n", hi1); | |
273 | seq_printf(m, " hardirq off events: %11u\n", hi2); | |
274 | seq_printf(m, " redundant hardirq ons: %11u\n", hr1); | |
275 | seq_printf(m, " redundant hardirq offs: %11u\n", hr2); | |
276 | seq_printf(m, " softirq on events: %11u\n", si1); | |
277 | seq_printf(m, " softirq off events: %11u\n", si2); | |
278 | seq_printf(m, " redundant softirq ons: %11u\n", sr1); | |
279 | seq_printf(m, " redundant softirq offs: %11u\n", sr2); | |
280 | #endif | |
281 | } | |
282 | ||
283 | static int lockdep_stats_show(struct seq_file *m, void *v) | |
284 | { | |
285 | struct lock_class *class; | |
286 | unsigned long nr_unused = 0, nr_uncategorized = 0, | |
287 | nr_irq_safe = 0, nr_irq_unsafe = 0, | |
288 | nr_softirq_safe = 0, nr_softirq_unsafe = 0, | |
289 | nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, | |
290 | nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, | |
291 | nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, | |
292 | nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, | |
293 | sum_forward_deps = 0, factor = 0; | |
294 | ||
295 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
296 | ||
297 | if (class->usage_mask == 0) | |
298 | nr_unused++; | |
299 | if (class->usage_mask == LOCKF_USED) | |
300 | nr_uncategorized++; | |
301 | if (class->usage_mask & LOCKF_USED_IN_IRQ) | |
302 | nr_irq_safe++; | |
303 | if (class->usage_mask & LOCKF_ENABLED_IRQS) | |
304 | nr_irq_unsafe++; | |
305 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) | |
306 | nr_softirq_safe++; | |
307 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS) | |
308 | nr_softirq_unsafe++; | |
309 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) | |
310 | nr_hardirq_safe++; | |
311 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQS) | |
312 | nr_hardirq_unsafe++; | |
313 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) | |
314 | nr_irq_read_safe++; | |
315 | if (class->usage_mask & LOCKF_ENABLED_IRQS_READ) | |
316 | nr_irq_read_unsafe++; | |
317 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) | |
318 | nr_softirq_read_safe++; | |
319 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS_READ) | |
320 | nr_softirq_read_unsafe++; | |
321 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) | |
322 | nr_hardirq_read_safe++; | |
323 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQS_READ) | |
324 | nr_hardirq_read_unsafe++; | |
325 | ||
df60a844 | 326 | #ifdef CONFIG_PROVE_LOCKING |
419ca3f1 | 327 | sum_forward_deps += lockdep_count_forward_deps(class); |
df60a844 | 328 | #endif |
a8f24a39 | 329 | } |
501b9ebf | 330 | #ifdef CONFIG_DEBUG_LOCKDEP |
a8f24a39 IM |
331 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(&nr_unused_locks) != nr_unused); |
332 | #endif | |
333 | seq_printf(m, " lock-classes: %11lu [max: %lu]\n", | |
334 | nr_lock_classes, MAX_LOCKDEP_KEYS); | |
335 | seq_printf(m, " direct dependencies: %11lu [max: %lu]\n", | |
336 | nr_list_entries, MAX_LOCKDEP_ENTRIES); | |
337 | seq_printf(m, " indirect dependencies: %11lu\n", | |
338 | sum_forward_deps); | |
339 | ||
340 | /* | |
341 | * Total number of dependencies: | |
342 | * | |
343 | * All irq-safe locks may nest inside irq-unsafe locks, | |
344 | * plus all the other known dependencies: | |
345 | */ | |
346 | seq_printf(m, " all direct dependencies: %11lu\n", | |
347 | nr_irq_unsafe * nr_irq_safe + | |
348 | nr_hardirq_unsafe * nr_hardirq_safe + | |
349 | nr_list_entries); | |
350 | ||
351 | /* | |
352 | * Estimated factor between direct and indirect | |
353 | * dependencies: | |
354 | */ | |
355 | if (nr_list_entries) | |
356 | factor = sum_forward_deps / nr_list_entries; | |
357 | ||
8e18257d | 358 | #ifdef CONFIG_PROVE_LOCKING |
a8f24a39 IM |
359 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n", |
360 | nr_lock_chains, MAX_LOCKDEP_CHAINS); | |
443cd507 | 361 | seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n", |
cd1a28e8 | 362 | nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS); |
8e18257d | 363 | #endif |
a8f24a39 IM |
364 | |
365 | #ifdef CONFIG_TRACE_IRQFLAGS | |
366 | seq_printf(m, " in-hardirq chains: %11u\n", | |
367 | nr_hardirq_chains); | |
368 | seq_printf(m, " in-softirq chains: %11u\n", | |
369 | nr_softirq_chains); | |
370 | #endif | |
371 | seq_printf(m, " in-process chains: %11u\n", | |
372 | nr_process_chains); | |
373 | seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n", | |
374 | nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); | |
375 | seq_printf(m, " combined max dependencies: %11u\n", | |
376 | (nr_hardirq_chains + 1) * | |
377 | (nr_softirq_chains + 1) * | |
378 | (nr_process_chains + 1) | |
379 | ); | |
380 | seq_printf(m, " hardirq-safe locks: %11lu\n", | |
381 | nr_hardirq_safe); | |
382 | seq_printf(m, " hardirq-unsafe locks: %11lu\n", | |
383 | nr_hardirq_unsafe); | |
384 | seq_printf(m, " softirq-safe locks: %11lu\n", | |
385 | nr_softirq_safe); | |
386 | seq_printf(m, " softirq-unsafe locks: %11lu\n", | |
387 | nr_softirq_unsafe); | |
388 | seq_printf(m, " irq-safe locks: %11lu\n", | |
389 | nr_irq_safe); | |
390 | seq_printf(m, " irq-unsafe locks: %11lu\n", | |
391 | nr_irq_unsafe); | |
392 | ||
393 | seq_printf(m, " hardirq-read-safe locks: %11lu\n", | |
394 | nr_hardirq_read_safe); | |
395 | seq_printf(m, " hardirq-read-unsafe locks: %11lu\n", | |
396 | nr_hardirq_read_unsafe); | |
397 | seq_printf(m, " softirq-read-safe locks: %11lu\n", | |
398 | nr_softirq_read_safe); | |
399 | seq_printf(m, " softirq-read-unsafe locks: %11lu\n", | |
400 | nr_softirq_read_unsafe); | |
401 | seq_printf(m, " irq-read-safe locks: %11lu\n", | |
402 | nr_irq_read_safe); | |
403 | seq_printf(m, " irq-read-unsafe locks: %11lu\n", | |
404 | nr_irq_read_unsafe); | |
405 | ||
406 | seq_printf(m, " uncategorized locks: %11lu\n", | |
407 | nr_uncategorized); | |
408 | seq_printf(m, " unused locks: %11lu\n", | |
409 | nr_unused); | |
410 | seq_printf(m, " max locking depth: %11u\n", | |
411 | max_lockdep_depth); | |
412 | seq_printf(m, " max recursion depth: %11u\n", | |
413 | max_recursion_depth); | |
414 | lockdep_stats_debug_show(m); | |
415 | seq_printf(m, " debug_locks: %11u\n", | |
416 | debug_locks); | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
421 | static int lockdep_stats_open(struct inode *inode, struct file *file) | |
422 | { | |
423 | return single_open(file, lockdep_stats_show, NULL); | |
424 | } | |
425 | ||
15ad7cdc | 426 | static const struct file_operations proc_lockdep_stats_operations = { |
a8f24a39 IM |
427 | .open = lockdep_stats_open, |
428 | .read = seq_read, | |
429 | .llseek = seq_lseek, | |
c0f33586 | 430 | .release = single_release, |
a8f24a39 IM |
431 | }; |
432 | ||
c46261de PZ |
433 | #ifdef CONFIG_LOCK_STAT |
434 | ||
435 | struct lock_stat_data { | |
436 | struct lock_class *class; | |
437 | struct lock_class_stats stats; | |
438 | }; | |
439 | ||
440 | struct lock_stat_seq { | |
441 | struct lock_stat_data *iter; | |
442 | struct lock_stat_data *iter_end; | |
443 | struct lock_stat_data stats[MAX_LOCKDEP_KEYS]; | |
444 | }; | |
445 | ||
446 | /* | |
447 | * sort on absolute number of contentions | |
448 | */ | |
449 | static int lock_stat_cmp(const void *l, const void *r) | |
450 | { | |
451 | const struct lock_stat_data *dl = l, *dr = r; | |
452 | unsigned long nl, nr; | |
453 | ||
454 | nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr; | |
455 | nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr; | |
456 | ||
457 | return nr - nl; | |
458 | } | |
459 | ||
460 | static void seq_line(struct seq_file *m, char c, int offset, int length) | |
461 | { | |
462 | int i; | |
463 | ||
464 | for (i = 0; i < offset; i++) | |
465 | seq_puts(m, " "); | |
466 | for (i = 0; i < length; i++) | |
467 | seq_printf(m, "%c", c); | |
468 | seq_puts(m, "\n"); | |
469 | } | |
470 | ||
471 | static void snprint_time(char *buf, size_t bufsiz, s64 nr) | |
472 | { | |
473 | unsigned long rem; | |
474 | ||
2189459d | 475 | nr += 5; /* for display rounding */ |
c46261de | 476 | rem = do_div(nr, 1000); /* XXX: do_div_signed */ |
2189459d | 477 | snprintf(buf, bufsiz, "%lld.%02d", (long long)nr, (int)rem/10); |
c46261de PZ |
478 | } |
479 | ||
480 | static void seq_time(struct seq_file *m, s64 time) | |
481 | { | |
482 | char num[15]; | |
483 | ||
484 | snprint_time(num, sizeof(num), time); | |
485 | seq_printf(m, " %14s", num); | |
486 | } | |
487 | ||
488 | static void seq_lock_time(struct seq_file *m, struct lock_time *lt) | |
489 | { | |
490 | seq_printf(m, "%14lu", lt->nr); | |
491 | seq_time(m, lt->min); | |
492 | seq_time(m, lt->max); | |
493 | seq_time(m, lt->total); | |
494 | } | |
495 | ||
496 | static void seq_stats(struct seq_file *m, struct lock_stat_data *data) | |
497 | { | |
498 | char name[39]; | |
499 | struct lock_class *class; | |
500 | struct lock_class_stats *stats; | |
501 | int i, namelen; | |
502 | ||
503 | class = data->class; | |
504 | stats = &data->stats; | |
505 | ||
d38e1d5a PZ |
506 | namelen = 38; |
507 | if (class->name_version > 1) | |
508 | namelen -= 2; /* XXX truncates versions > 9 */ | |
509 | if (class->subclass) | |
510 | namelen -= 2; | |
511 | ||
512 | if (!class->name) { | |
513 | char str[KSYM_NAME_LEN]; | |
514 | const char *key_name; | |
515 | ||
516 | key_name = __get_key_name(class->key, str); | |
517 | snprintf(name, namelen, "%s", key_name); | |
518 | } else { | |
519 | snprintf(name, namelen, "%s", class->name); | |
520 | } | |
c46261de | 521 | namelen = strlen(name); |
d38e1d5a PZ |
522 | if (class->name_version > 1) { |
523 | snprintf(name+namelen, 3, "#%d", class->name_version); | |
524 | namelen += 2; | |
525 | } | |
526 | if (class->subclass) { | |
527 | snprintf(name+namelen, 3, "/%d", class->subclass); | |
528 | namelen += 2; | |
529 | } | |
c46261de PZ |
530 | |
531 | if (stats->write_holdtime.nr) { | |
532 | if (stats->read_holdtime.nr) | |
533 | seq_printf(m, "%38s-W:", name); | |
534 | else | |
535 | seq_printf(m, "%40s:", name); | |
536 | ||
96645678 | 537 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); |
c46261de | 538 | seq_lock_time(m, &stats->write_waittime); |
96645678 | 539 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); |
c46261de PZ |
540 | seq_lock_time(m, &stats->write_holdtime); |
541 | seq_puts(m, "\n"); | |
542 | } | |
543 | ||
544 | if (stats->read_holdtime.nr) { | |
545 | seq_printf(m, "%38s-R:", name); | |
96645678 | 546 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); |
c46261de | 547 | seq_lock_time(m, &stats->read_waittime); |
96645678 | 548 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); |
c46261de PZ |
549 | seq_lock_time(m, &stats->read_holdtime); |
550 | seq_puts(m, "\n"); | |
551 | } | |
552 | ||
553 | if (stats->read_waittime.nr + stats->write_waittime.nr == 0) | |
554 | return; | |
555 | ||
556 | if (stats->read_holdtime.nr) | |
557 | namelen += 2; | |
558 | ||
559 | for (i = 0; i < ARRAY_SIZE(class->contention_point); i++) { | |
560 | char sym[KSYM_SYMBOL_LEN]; | |
561 | char ip[32]; | |
562 | ||
563 | if (class->contention_point[i] == 0) | |
564 | break; | |
565 | ||
566 | if (!i) | |
567 | seq_line(m, '-', 40-namelen, namelen); | |
568 | ||
569 | sprint_symbol(sym, class->contention_point[i]); | |
570 | snprintf(ip, sizeof(ip), "[<%p>]", | |
571 | (void *)class->contention_point[i]); | |
572 | seq_printf(m, "%40s %14lu %29s %s\n", name, | |
573 | stats->contention_point[i], | |
574 | ip, sym); | |
575 | } | |
576 | if (i) { | |
577 | seq_puts(m, "\n"); | |
96645678 | 578 | seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1)); |
c46261de PZ |
579 | seq_puts(m, "\n"); |
580 | } | |
581 | } | |
582 | ||
583 | static void seq_header(struct seq_file *m) | |
584 | { | |
96645678 PZ |
585 | seq_printf(m, "lock_stat version 0.2\n"); |
586 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); | |
587 | seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s " | |
588 | "%14s %14s\n", | |
c46261de | 589 | "class name", |
96645678 | 590 | "con-bounces", |
c46261de PZ |
591 | "contentions", |
592 | "waittime-min", | |
593 | "waittime-max", | |
594 | "waittime-total", | |
96645678 | 595 | "acq-bounces", |
c46261de PZ |
596 | "acquisitions", |
597 | "holdtime-min", | |
598 | "holdtime-max", | |
599 | "holdtime-total"); | |
96645678 | 600 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); |
c46261de PZ |
601 | seq_printf(m, "\n"); |
602 | } | |
603 | ||
604 | static void *ls_start(struct seq_file *m, loff_t *pos) | |
605 | { | |
606 | struct lock_stat_seq *data = m->private; | |
607 | ||
94c61c0a TP |
608 | if (*pos == 0) |
609 | return SEQ_START_TOKEN; | |
c46261de | 610 | |
94c61c0a TP |
611 | data->iter = data->stats + *pos; |
612 | if (data->iter >= data->iter_end) | |
4b32d0a4 PZ |
613 | data->iter = NULL; |
614 | ||
c46261de PZ |
615 | return data->iter; |
616 | } | |
617 | ||
618 | static void *ls_next(struct seq_file *m, void *v, loff_t *pos) | |
619 | { | |
620 | struct lock_stat_seq *data = m->private; | |
621 | ||
622 | (*pos)++; | |
623 | ||
94c61c0a TP |
624 | if (v == SEQ_START_TOKEN) |
625 | data->iter = data->stats; | |
626 | else { | |
627 | data->iter = v; | |
628 | data->iter++; | |
629 | } | |
630 | ||
c46261de PZ |
631 | if (data->iter == data->iter_end) |
632 | data->iter = NULL; | |
633 | ||
634 | return data->iter; | |
635 | } | |
636 | ||
637 | static void ls_stop(struct seq_file *m, void *v) | |
638 | { | |
639 | } | |
640 | ||
641 | static int ls_show(struct seq_file *m, void *v) | |
642 | { | |
94c61c0a TP |
643 | if (v == SEQ_START_TOKEN) |
644 | seq_header(m); | |
645 | else | |
646 | seq_stats(m, v); | |
c46261de | 647 | |
c46261de PZ |
648 | return 0; |
649 | } | |
650 | ||
651 | static struct seq_operations lockstat_ops = { | |
652 | .start = ls_start, | |
653 | .next = ls_next, | |
654 | .stop = ls_stop, | |
655 | .show = ls_show, | |
656 | }; | |
657 | ||
658 | static int lock_stat_open(struct inode *inode, struct file *file) | |
659 | { | |
660 | int res; | |
661 | struct lock_class *class; | |
662 | struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); | |
663 | ||
664 | if (!data) | |
665 | return -ENOMEM; | |
666 | ||
667 | res = seq_open(file, &lockstat_ops); | |
668 | if (!res) { | |
669 | struct lock_stat_data *iter = data->stats; | |
670 | struct seq_file *m = file->private_data; | |
671 | ||
672 | data->iter = iter; | |
673 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
674 | iter->class = class; | |
675 | iter->stats = lock_stats(class); | |
676 | iter++; | |
677 | } | |
678 | data->iter_end = iter; | |
679 | ||
680 | sort(data->stats, data->iter_end - data->iter, | |
681 | sizeof(struct lock_stat_data), | |
682 | lock_stat_cmp, NULL); | |
683 | ||
684 | m->private = data; | |
685 | } else | |
686 | vfree(data); | |
687 | ||
688 | return res; | |
689 | } | |
690 | ||
691 | static ssize_t lock_stat_write(struct file *file, const char __user *buf, | |
692 | size_t count, loff_t *ppos) | |
693 | { | |
694 | struct lock_class *class; | |
695 | char c; | |
696 | ||
697 | if (count) { | |
698 | if (get_user(c, buf)) | |
699 | return -EFAULT; | |
700 | ||
701 | if (c != '0') | |
702 | return count; | |
703 | ||
704 | list_for_each_entry(class, &all_lock_classes, lock_entry) | |
705 | clear_lock_stats(class); | |
706 | } | |
707 | return count; | |
708 | } | |
709 | ||
710 | static int lock_stat_release(struct inode *inode, struct file *file) | |
711 | { | |
712 | struct seq_file *seq = file->private_data; | |
713 | ||
714 | vfree(seq->private); | |
715 | seq->private = NULL; | |
716 | return seq_release(inode, file); | |
717 | } | |
718 | ||
719 | static const struct file_operations proc_lock_stat_operations = { | |
720 | .open = lock_stat_open, | |
721 | .write = lock_stat_write, | |
722 | .read = seq_read, | |
723 | .llseek = seq_lseek, | |
724 | .release = lock_stat_release, | |
725 | }; | |
726 | #endif /* CONFIG_LOCK_STAT */ | |
727 | ||
a8f24a39 IM |
728 | static int __init lockdep_proc_init(void) |
729 | { | |
c33fff0a | 730 | proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations); |
cd1a28e8 | 731 | #ifdef CONFIG_PROVE_LOCKING |
443cd507 HY |
732 | proc_create("lockdep_chains", S_IRUSR, NULL, |
733 | &proc_lockdep_chains_operations); | |
cd1a28e8 | 734 | #endif |
c33fff0a DL |
735 | proc_create("lockdep_stats", S_IRUSR, NULL, |
736 | &proc_lockdep_stats_operations); | |
a8f24a39 | 737 | |
c46261de | 738 | #ifdef CONFIG_LOCK_STAT |
c33fff0a | 739 | proc_create("lock_stat", S_IRUSR, NULL, &proc_lock_stat_operations); |
c46261de PZ |
740 | #endif |
741 | ||
a8f24a39 IM |
742 | return 0; |
743 | } | |
744 | ||
745 | __initcall(lockdep_proc_init); | |
746 |