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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 | */ | |
9984de1a | 14 | #include <linux/export.h> |
a8f24a39 IM |
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 | { | |
8109e1de | 28 | return seq_list_next(v, &all_lock_classes, pos); |
a8f24a39 IM |
29 | } |
30 | ||
31 | static void *l_start(struct seq_file *m, loff_t *pos) | |
32 | { | |
8109e1de | 33 | return seq_list_start_head(&all_lock_classes, *pos); |
a8f24a39 IM |
34 | } |
35 | ||
36 | static void l_stop(struct seq_file *m, void *v) | |
37 | { | |
38 | } | |
39 | ||
068135e6 JB |
40 | static void print_name(struct seq_file *m, struct lock_class *class) |
41 | { | |
99fb4a12 | 42 | char str[KSYM_NAME_LEN]; |
068135e6 JB |
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 | ||
a8f24a39 IM |
57 | static int l_show(struct seq_file *m, void *v) |
58 | { | |
8109e1de | 59 | struct lock_class *class = list_entry(v, struct lock_class, lock_entry); |
068135e6 | 60 | struct lock_list *entry; |
f510b233 | 61 | char usage[LOCK_USAGE_CHARS]; |
a8f24a39 | 62 | |
8109e1de | 63 | if (v == &all_lock_classes) { |
94c61c0a TP |
64 | seq_printf(m, "all lock classes:\n"); |
65 | return 0; | |
66 | } | |
67 | ||
a8f24a39 IM |
68 | seq_printf(m, "%p", class->key); |
69 | #ifdef CONFIG_DEBUG_LOCKDEP | |
70 | seq_printf(m, " OPS:%8ld", class->ops); | |
71 | #endif | |
df60a844 SH |
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 | |
a8f24a39 | 76 | |
f510b233 PZ |
77 | get_usage_chars(class, usage); |
78 | seq_printf(m, " %s", usage); | |
a8f24a39 | 79 | |
068135e6 JB |
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) { | |
2429e4ee | 86 | seq_printf(m, " -> [%p] ", entry->class->key); |
068135e6 JB |
87 | print_name(m, entry->class); |
88 | seq_puts(m, "\n"); | |
89 | } | |
a8f24a39 IM |
90 | } |
91 | seq_puts(m, "\n"); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
15ad7cdc | 96 | static const struct seq_operations lockdep_ops = { |
a8f24a39 IM |
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 | { | |
8109e1de | 105 | return seq_open(file, &lockdep_ops); |
a8f24a39 IM |
106 | } |
107 | ||
15ad7cdc | 108 | static const struct file_operations proc_lockdep_operations = { |
a8f24a39 IM |
109 | .open = lockdep_open, |
110 | .read = seq_read, | |
111 | .llseek = seq_lseek, | |
112 | .release = seq_release, | |
113 | }; | |
114 | ||
cd1a28e8 | 115 | #ifdef CONFIG_PROVE_LOCKING |
443cd507 HY |
116 | static void *lc_start(struct seq_file *m, loff_t *pos) |
117 | { | |
118 | if (*pos == 0) | |
119 | return SEQ_START_TOKEN; | |
120 | ||
e9d65725 LZ |
121 | if (*pos - 1 < nr_lock_chains) |
122 | return lock_chains + (*pos - 1); | |
443cd507 HY |
123 | |
124 | return NULL; | |
125 | } | |
126 | ||
12aac19d LZ |
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 | ||
443cd507 HY |
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); | |
8bfe0298 RV |
152 | if (!class->key) |
153 | continue; | |
154 | ||
443cd507 HY |
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 | { | |
12aac19d | 173 | return seq_open(file, &lockdep_chains_ops); |
443cd507 HY |
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 | }; | |
cd1a28e8 | 182 | #endif /* CONFIG_PROVE_LOCKING */ |
443cd507 | 183 | |
a8f24a39 IM |
184 | static void lockdep_stats_debug_show(struct seq_file *m) |
185 | { | |
186 | #ifdef CONFIG_DEBUG_LOCKDEP | |
bd6d29c2 FW |
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); | |
a8f24a39 IM |
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, | |
dec29608 | 228 | sum_forward_deps = 0; |
a8f24a39 IM |
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++; | |
4fc95e86 | 238 | if (class->usage_mask & LOCKF_ENABLED_IRQ) |
a8f24a39 IM |
239 | nr_irq_unsafe++; |
240 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) | |
241 | nr_softirq_safe++; | |
4fc95e86 | 242 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ) |
a8f24a39 IM |
243 | nr_softirq_unsafe++; |
244 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) | |
245 | nr_hardirq_safe++; | |
4fc95e86 | 246 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ) |
a8f24a39 IM |
247 | nr_hardirq_unsafe++; |
248 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) | |
249 | nr_irq_read_safe++; | |
4fc95e86 | 250 | if (class->usage_mask & LOCKF_ENABLED_IRQ_READ) |
a8f24a39 IM |
251 | nr_irq_read_unsafe++; |
252 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) | |
253 | nr_softirq_read_safe++; | |
4fc95e86 | 254 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ) |
a8f24a39 IM |
255 | nr_softirq_read_unsafe++; |
256 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) | |
257 | nr_hardirq_read_safe++; | |
4fc95e86 | 258 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ) |
a8f24a39 IM |
259 | nr_hardirq_read_unsafe++; |
260 | ||
df60a844 | 261 | #ifdef CONFIG_PROVE_LOCKING |
419ca3f1 | 262 | sum_forward_deps += lockdep_count_forward_deps(class); |
df60a844 | 263 | #endif |
a8f24a39 | 264 | } |
501b9ebf | 265 | #ifdef CONFIG_DEBUG_LOCKDEP |
bd6d29c2 | 266 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused); |
a8f24a39 IM |
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 | ||
8e18257d | 286 | #ifdef CONFIG_PROVE_LOCKING |
a8f24a39 IM |
287 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n", |
288 | nr_lock_chains, MAX_LOCKDEP_CHAINS); | |
443cd507 | 289 | seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n", |
cd1a28e8 | 290 | nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS); |
8e18257d | 291 | #endif |
a8f24a39 IM |
292 | |
293 | #ifdef CONFIG_TRACE_IRQFLAGS | |
294 | seq_printf(m, " in-hardirq chains: %11u\n", | |
295 | nr_hardirq_chains); | |
296 | seq_printf(m, " in-softirq chains: %11u\n", | |
297 | nr_softirq_chains); | |
298 | #endif | |
299 | seq_printf(m, " in-process chains: %11u\n", | |
300 | nr_process_chains); | |
301 | seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n", | |
302 | nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); | |
303 | seq_printf(m, " combined max dependencies: %11u\n", | |
304 | (nr_hardirq_chains + 1) * | |
305 | (nr_softirq_chains + 1) * | |
306 | (nr_process_chains + 1) | |
307 | ); | |
308 | seq_printf(m, " hardirq-safe locks: %11lu\n", | |
309 | nr_hardirq_safe); | |
310 | seq_printf(m, " hardirq-unsafe locks: %11lu\n", | |
311 | nr_hardirq_unsafe); | |
312 | seq_printf(m, " softirq-safe locks: %11lu\n", | |
313 | nr_softirq_safe); | |
314 | seq_printf(m, " softirq-unsafe locks: %11lu\n", | |
315 | nr_softirq_unsafe); | |
316 | seq_printf(m, " irq-safe locks: %11lu\n", | |
317 | nr_irq_safe); | |
318 | seq_printf(m, " irq-unsafe locks: %11lu\n", | |
319 | nr_irq_unsafe); | |
320 | ||
321 | seq_printf(m, " hardirq-read-safe locks: %11lu\n", | |
322 | nr_hardirq_read_safe); | |
323 | seq_printf(m, " hardirq-read-unsafe locks: %11lu\n", | |
324 | nr_hardirq_read_unsafe); | |
325 | seq_printf(m, " softirq-read-safe locks: %11lu\n", | |
326 | nr_softirq_read_safe); | |
327 | seq_printf(m, " softirq-read-unsafe locks: %11lu\n", | |
328 | nr_softirq_read_unsafe); | |
329 | seq_printf(m, " irq-read-safe locks: %11lu\n", | |
330 | nr_irq_read_safe); | |
331 | seq_printf(m, " irq-read-unsafe locks: %11lu\n", | |
332 | nr_irq_read_unsafe); | |
333 | ||
334 | seq_printf(m, " uncategorized locks: %11lu\n", | |
335 | nr_uncategorized); | |
336 | seq_printf(m, " unused locks: %11lu\n", | |
337 | nr_unused); | |
338 | seq_printf(m, " max locking depth: %11u\n", | |
339 | max_lockdep_depth); | |
bbfa2622 | 340 | #ifdef CONFIG_PROVE_LOCKING |
12f3dfd0 ML |
341 | seq_printf(m, " max bfs queue depth: %11u\n", |
342 | max_bfs_queue_depth); | |
bbfa2622 | 343 | #endif |
a8f24a39 IM |
344 | lockdep_stats_debug_show(m); |
345 | seq_printf(m, " debug_locks: %11u\n", | |
346 | debug_locks); | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | static int lockdep_stats_open(struct inode *inode, struct file *file) | |
352 | { | |
353 | return single_open(file, lockdep_stats_show, NULL); | |
354 | } | |
355 | ||
15ad7cdc | 356 | static const struct file_operations proc_lockdep_stats_operations = { |
a8f24a39 IM |
357 | .open = lockdep_stats_open, |
358 | .read = seq_read, | |
359 | .llseek = seq_lseek, | |
c0f33586 | 360 | .release = single_release, |
a8f24a39 IM |
361 | }; |
362 | ||
c46261de PZ |
363 | #ifdef CONFIG_LOCK_STAT |
364 | ||
365 | struct lock_stat_data { | |
366 | struct lock_class *class; | |
367 | struct lock_class_stats stats; | |
368 | }; | |
369 | ||
370 | struct lock_stat_seq { | |
c46261de PZ |
371 | struct lock_stat_data *iter_end; |
372 | struct lock_stat_data stats[MAX_LOCKDEP_KEYS]; | |
373 | }; | |
374 | ||
375 | /* | |
376 | * sort on absolute number of contentions | |
377 | */ | |
378 | static int lock_stat_cmp(const void *l, const void *r) | |
379 | { | |
380 | const struct lock_stat_data *dl = l, *dr = r; | |
381 | unsigned long nl, nr; | |
382 | ||
383 | nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr; | |
384 | nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr; | |
385 | ||
386 | return nr - nl; | |
387 | } | |
388 | ||
389 | static void seq_line(struct seq_file *m, char c, int offset, int length) | |
390 | { | |
391 | int i; | |
392 | ||
393 | for (i = 0; i < offset; i++) | |
394 | seq_puts(m, " "); | |
395 | for (i = 0; i < length; i++) | |
396 | seq_printf(m, "%c", c); | |
397 | seq_puts(m, "\n"); | |
398 | } | |
399 | ||
400 | static void snprint_time(char *buf, size_t bufsiz, s64 nr) | |
401 | { | |
6918bc5c PZ |
402 | s64 div; |
403 | s32 rem; | |
c46261de | 404 | |
2189459d | 405 | nr += 5; /* for display rounding */ |
6918bc5c PZ |
406 | div = div_s64_rem(nr, 1000, &rem); |
407 | snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10); | |
c46261de PZ |
408 | } |
409 | ||
410 | static void seq_time(struct seq_file *m, s64 time) | |
411 | { | |
412 | char num[15]; | |
413 | ||
414 | snprint_time(num, sizeof(num), time); | |
415 | seq_printf(m, " %14s", num); | |
416 | } | |
417 | ||
418 | static void seq_lock_time(struct seq_file *m, struct lock_time *lt) | |
419 | { | |
420 | seq_printf(m, "%14lu", lt->nr); | |
421 | seq_time(m, lt->min); | |
422 | seq_time(m, lt->max); | |
423 | seq_time(m, lt->total); | |
838cc7b4 | 424 | seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0); |
c46261de PZ |
425 | } |
426 | ||
427 | static void seq_stats(struct seq_file *m, struct lock_stat_data *data) | |
428 | { | |
429 | char name[39]; | |
430 | struct lock_class *class; | |
431 | struct lock_class_stats *stats; | |
432 | int i, namelen; | |
433 | ||
434 | class = data->class; | |
435 | stats = &data->stats; | |
436 | ||
d38e1d5a PZ |
437 | namelen = 38; |
438 | if (class->name_version > 1) | |
439 | namelen -= 2; /* XXX truncates versions > 9 */ | |
440 | if (class->subclass) | |
441 | namelen -= 2; | |
442 | ||
443 | if (!class->name) { | |
444 | char str[KSYM_NAME_LEN]; | |
445 | const char *key_name; | |
446 | ||
447 | key_name = __get_key_name(class->key, str); | |
448 | snprintf(name, namelen, "%s", key_name); | |
449 | } else { | |
450 | snprintf(name, namelen, "%s", class->name); | |
451 | } | |
c46261de | 452 | namelen = strlen(name); |
d38e1d5a PZ |
453 | if (class->name_version > 1) { |
454 | snprintf(name+namelen, 3, "#%d", class->name_version); | |
455 | namelen += 2; | |
456 | } | |
457 | if (class->subclass) { | |
458 | snprintf(name+namelen, 3, "/%d", class->subclass); | |
459 | namelen += 2; | |
460 | } | |
c46261de PZ |
461 | |
462 | if (stats->write_holdtime.nr) { | |
463 | if (stats->read_holdtime.nr) | |
464 | seq_printf(m, "%38s-W:", name); | |
465 | else | |
466 | seq_printf(m, "%40s:", name); | |
467 | ||
96645678 | 468 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); |
c46261de | 469 | seq_lock_time(m, &stats->write_waittime); |
96645678 | 470 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); |
c46261de PZ |
471 | seq_lock_time(m, &stats->write_holdtime); |
472 | seq_puts(m, "\n"); | |
473 | } | |
474 | ||
475 | if (stats->read_holdtime.nr) { | |
476 | seq_printf(m, "%38s-R:", name); | |
96645678 | 477 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); |
c46261de | 478 | seq_lock_time(m, &stats->read_waittime); |
96645678 | 479 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); |
c46261de PZ |
480 | seq_lock_time(m, &stats->read_holdtime); |
481 | seq_puts(m, "\n"); | |
482 | } | |
483 | ||
484 | if (stats->read_waittime.nr + stats->write_waittime.nr == 0) | |
485 | return; | |
486 | ||
487 | if (stats->read_holdtime.nr) | |
488 | namelen += 2; | |
489 | ||
c7e78cff | 490 | for (i = 0; i < LOCKSTAT_POINTS; i++) { |
c46261de PZ |
491 | char ip[32]; |
492 | ||
493 | if (class->contention_point[i] == 0) | |
494 | break; | |
495 | ||
496 | if (!i) | |
497 | seq_line(m, '-', 40-namelen, namelen); | |
498 | ||
c46261de PZ |
499 | snprintf(ip, sizeof(ip), "[<%p>]", |
500 | (void *)class->contention_point[i]); | |
3cf9b85b JP |
501 | seq_printf(m, "%40s %14lu %29s %pS\n", |
502 | name, stats->contention_point[i], | |
503 | ip, (void *)class->contention_point[i]); | |
c46261de | 504 | } |
c7e78cff | 505 | for (i = 0; i < LOCKSTAT_POINTS; i++) { |
c7e78cff PZ |
506 | char ip[32]; |
507 | ||
508 | if (class->contending_point[i] == 0) | |
509 | break; | |
510 | ||
511 | if (!i) | |
512 | seq_line(m, '-', 40-namelen, namelen); | |
513 | ||
c7e78cff PZ |
514 | snprintf(ip, sizeof(ip), "[<%p>]", |
515 | (void *)class->contending_point[i]); | |
3cf9b85b JP |
516 | seq_printf(m, "%40s %14lu %29s %pS\n", |
517 | name, stats->contending_point[i], | |
518 | ip, (void *)class->contending_point[i]); | |
c7e78cff | 519 | } |
c46261de PZ |
520 | if (i) { |
521 | seq_puts(m, "\n"); | |
1232e380 | 522 | seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1)); |
c46261de PZ |
523 | seq_puts(m, "\n"); |
524 | } | |
525 | } | |
526 | ||
527 | static void seq_header(struct seq_file *m) | |
528 | { | |
1232e380 | 529 | seq_puts(m, "lock_stat version 0.4\n"); |
9833f8cb PZ |
530 | |
531 | if (unlikely(!debug_locks)) | |
532 | seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n"); | |
533 | ||
1232e380 DB |
534 | seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1)); |
535 | seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s " | |
96645678 | 536 | "%14s %14s\n", |
c46261de | 537 | "class name", |
96645678 | 538 | "con-bounces", |
c46261de PZ |
539 | "contentions", |
540 | "waittime-min", | |
541 | "waittime-max", | |
542 | "waittime-total", | |
1232e380 | 543 | "waittime-avg", |
96645678 | 544 | "acq-bounces", |
c46261de PZ |
545 | "acquisitions", |
546 | "holdtime-min", | |
547 | "holdtime-max", | |
1232e380 DB |
548 | "holdtime-total", |
549 | "holdtime-avg"); | |
550 | seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1)); | |
c46261de PZ |
551 | seq_printf(m, "\n"); |
552 | } | |
553 | ||
554 | static void *ls_start(struct seq_file *m, loff_t *pos) | |
555 | { | |
556 | struct lock_stat_seq *data = m->private; | |
96004bb2 | 557 | struct lock_stat_data *iter; |
c46261de | 558 | |
94c61c0a TP |
559 | if (*pos == 0) |
560 | return SEQ_START_TOKEN; | |
c46261de | 561 | |
96004bb2 LZ |
562 | iter = data->stats + (*pos - 1); |
563 | if (iter >= data->iter_end) | |
564 | iter = NULL; | |
4b32d0a4 | 565 | |
96004bb2 | 566 | return iter; |
c46261de PZ |
567 | } |
568 | ||
569 | static void *ls_next(struct seq_file *m, void *v, loff_t *pos) | |
570 | { | |
c46261de | 571 | (*pos)++; |
96004bb2 | 572 | return ls_start(m, pos); |
c46261de PZ |
573 | } |
574 | ||
575 | static void ls_stop(struct seq_file *m, void *v) | |
576 | { | |
577 | } | |
578 | ||
579 | static int ls_show(struct seq_file *m, void *v) | |
580 | { | |
94c61c0a TP |
581 | if (v == SEQ_START_TOKEN) |
582 | seq_header(m); | |
583 | else | |
584 | seq_stats(m, v); | |
c46261de | 585 | |
c46261de PZ |
586 | return 0; |
587 | } | |
588 | ||
88e9d34c | 589 | static const struct seq_operations lockstat_ops = { |
c46261de PZ |
590 | .start = ls_start, |
591 | .next = ls_next, | |
592 | .stop = ls_stop, | |
593 | .show = ls_show, | |
594 | }; | |
595 | ||
596 | static int lock_stat_open(struct inode *inode, struct file *file) | |
597 | { | |
598 | int res; | |
599 | struct lock_class *class; | |
600 | struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); | |
601 | ||
602 | if (!data) | |
603 | return -ENOMEM; | |
604 | ||
605 | res = seq_open(file, &lockstat_ops); | |
606 | if (!res) { | |
607 | struct lock_stat_data *iter = data->stats; | |
608 | struct seq_file *m = file->private_data; | |
609 | ||
c46261de PZ |
610 | list_for_each_entry(class, &all_lock_classes, lock_entry) { |
611 | iter->class = class; | |
612 | iter->stats = lock_stats(class); | |
613 | iter++; | |
614 | } | |
615 | data->iter_end = iter; | |
616 | ||
96004bb2 | 617 | sort(data->stats, data->iter_end - data->stats, |
c46261de PZ |
618 | sizeof(struct lock_stat_data), |
619 | lock_stat_cmp, NULL); | |
620 | ||
621 | m->private = data; | |
622 | } else | |
623 | vfree(data); | |
624 | ||
625 | return res; | |
626 | } | |
627 | ||
628 | static ssize_t lock_stat_write(struct file *file, const char __user *buf, | |
629 | size_t count, loff_t *ppos) | |
630 | { | |
631 | struct lock_class *class; | |
632 | char c; | |
633 | ||
634 | if (count) { | |
635 | if (get_user(c, buf)) | |
636 | return -EFAULT; | |
637 | ||
638 | if (c != '0') | |
639 | return count; | |
640 | ||
641 | list_for_each_entry(class, &all_lock_classes, lock_entry) | |
642 | clear_lock_stats(class); | |
643 | } | |
644 | return count; | |
645 | } | |
646 | ||
647 | static int lock_stat_release(struct inode *inode, struct file *file) | |
648 | { | |
649 | struct seq_file *seq = file->private_data; | |
650 | ||
651 | vfree(seq->private); | |
c46261de PZ |
652 | return seq_release(inode, file); |
653 | } | |
654 | ||
655 | static const struct file_operations proc_lock_stat_operations = { | |
656 | .open = lock_stat_open, | |
657 | .write = lock_stat_write, | |
658 | .read = seq_read, | |
659 | .llseek = seq_lseek, | |
660 | .release = lock_stat_release, | |
661 | }; | |
662 | #endif /* CONFIG_LOCK_STAT */ | |
663 | ||
a8f24a39 IM |
664 | static int __init lockdep_proc_init(void) |
665 | { | |
c33fff0a | 666 | proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations); |
cd1a28e8 | 667 | #ifdef CONFIG_PROVE_LOCKING |
443cd507 HY |
668 | proc_create("lockdep_chains", S_IRUSR, NULL, |
669 | &proc_lockdep_chains_operations); | |
cd1a28e8 | 670 | #endif |
c33fff0a DL |
671 | proc_create("lockdep_stats", S_IRUSR, NULL, |
672 | &proc_lockdep_stats_operations); | |
a8f24a39 | 673 | |
c46261de | 674 | #ifdef CONFIG_LOCK_STAT |
9795447f LZ |
675 | proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL, |
676 | &proc_lock_stat_operations); | |
c46261de PZ |
677 | #endif |
678 | ||
a8f24a39 IM |
679 | return 0; |
680 | } | |
681 | ||
682 | __initcall(lockdep_proc_init); | |
683 |