Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a8f24a39 IM |
2 | /* |
3 | * kernel/lockdep_proc.c | |
4 | * | |
5 | * Runtime locking correctness validator | |
6 | * | |
7 | * Started by Ingo Molnar: | |
8 | * | |
4b32d0a4 | 9 | * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> |
90eec103 | 10 | * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra |
a8f24a39 IM |
11 | * |
12 | * Code for /proc/lockdep and /proc/lockdep_stats: | |
13 | * | |
14 | */ | |
9984de1a | 15 | #include <linux/export.h> |
a8f24a39 IM |
16 | #include <linux/proc_fs.h> |
17 | #include <linux/seq_file.h> | |
18 | #include <linux/kallsyms.h> | |
19 | #include <linux/debug_locks.h> | |
c46261de PZ |
20 | #include <linux/vmalloc.h> |
21 | #include <linux/sort.h> | |
7c0f6ba6 | 22 | #include <linux/uaccess.h> |
c46261de | 23 | #include <asm/div64.h> |
a8f24a39 IM |
24 | |
25 | #include "lockdep_internals.h" | |
26 | ||
27 | static void *l_next(struct seq_file *m, void *v, loff_t *pos) | |
28 | { | |
8109e1de | 29 | return seq_list_next(v, &all_lock_classes, pos); |
a8f24a39 IM |
30 | } |
31 | ||
32 | static void *l_start(struct seq_file *m, loff_t *pos) | |
33 | { | |
8109e1de | 34 | return seq_list_start_head(&all_lock_classes, *pos); |
a8f24a39 IM |
35 | } |
36 | ||
37 | static void l_stop(struct seq_file *m, void *v) | |
38 | { | |
39 | } | |
40 | ||
068135e6 JB |
41 | static void print_name(struct seq_file *m, struct lock_class *class) |
42 | { | |
99fb4a12 | 43 | char str[KSYM_NAME_LEN]; |
068135e6 JB |
44 | const char *name = class->name; |
45 | ||
46 | if (!name) { | |
47 | name = __get_key_name(class->key, str); | |
48 | seq_printf(m, "%s", name); | |
49 | } else{ | |
50 | seq_printf(m, "%s", name); | |
51 | if (class->name_version > 1) | |
52 | seq_printf(m, "#%d", class->name_version); | |
53 | if (class->subclass) | |
54 | seq_printf(m, "/%d", class->subclass); | |
55 | } | |
56 | } | |
57 | ||
a8f24a39 IM |
58 | static int l_show(struct seq_file *m, void *v) |
59 | { | |
8109e1de | 60 | struct lock_class *class = list_entry(v, struct lock_class, lock_entry); |
068135e6 | 61 | struct lock_list *entry; |
f510b233 | 62 | char usage[LOCK_USAGE_CHARS]; |
a8f24a39 | 63 | |
8109e1de | 64 | if (v == &all_lock_classes) { |
94c61c0a TP |
65 | seq_printf(m, "all lock classes:\n"); |
66 | return 0; | |
67 | } | |
68 | ||
a8f24a39 IM |
69 | seq_printf(m, "%p", class->key); |
70 | #ifdef CONFIG_DEBUG_LOCKDEP | |
8ca2b56c | 71 | seq_printf(m, " OPS:%8ld", debug_class_ops_read(class)); |
a8f24a39 | 72 | #endif |
df60a844 SH |
73 | #ifdef CONFIG_PROVE_LOCKING |
74 | seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class)); | |
75 | seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class)); | |
76 | #endif | |
a8f24a39 | 77 | |
f510b233 PZ |
78 | get_usage_chars(class, usage); |
79 | seq_printf(m, " %s", usage); | |
a8f24a39 | 80 | |
068135e6 JB |
81 | seq_printf(m, ": "); |
82 | print_name(m, class); | |
83 | seq_puts(m, "\n"); | |
84 | ||
85 | list_for_each_entry(entry, &class->locks_after, entry) { | |
86 | if (entry->distance == 1) { | |
2429e4ee | 87 | seq_printf(m, " -> [%p] ", entry->class->key); |
068135e6 JB |
88 | print_name(m, entry->class); |
89 | seq_puts(m, "\n"); | |
90 | } | |
a8f24a39 IM |
91 | } |
92 | seq_puts(m, "\n"); | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
15ad7cdc | 97 | static const struct seq_operations lockdep_ops = { |
a8f24a39 IM |
98 | .start = l_start, |
99 | .next = l_next, | |
100 | .stop = l_stop, | |
101 | .show = l_show, | |
102 | }; | |
103 | ||
cd1a28e8 | 104 | #ifdef CONFIG_PROVE_LOCKING |
443cd507 HY |
105 | static void *lc_start(struct seq_file *m, loff_t *pos) |
106 | { | |
2212684a BVA |
107 | if (*pos < 0) |
108 | return NULL; | |
109 | ||
443cd507 HY |
110 | if (*pos == 0) |
111 | return SEQ_START_TOKEN; | |
112 | ||
2212684a | 113 | return lock_chains + (*pos - 1); |
443cd507 HY |
114 | } |
115 | ||
12aac19d LZ |
116 | static void *lc_next(struct seq_file *m, void *v, loff_t *pos) |
117 | { | |
2212684a | 118 | *pos = lockdep_next_lockchain(*pos - 1) + 1; |
12aac19d LZ |
119 | return lc_start(m, pos); |
120 | } | |
121 | ||
443cd507 HY |
122 | static void lc_stop(struct seq_file *m, void *v) |
123 | { | |
124 | } | |
125 | ||
126 | static int lc_show(struct seq_file *m, void *v) | |
127 | { | |
128 | struct lock_chain *chain = v; | |
129 | struct lock_class *class; | |
130 | int i; | |
131 | ||
132 | if (v == SEQ_START_TOKEN) { | |
75dd602a PZ |
133 | if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS) |
134 | seq_printf(m, "(buggered) "); | |
443cd507 HY |
135 | seq_printf(m, "all lock chains:\n"); |
136 | return 0; | |
137 | } | |
138 | ||
139 | seq_printf(m, "irq_context: %d\n", chain->irq_context); | |
140 | ||
141 | for (i = 0; i < chain->depth; i++) { | |
142 | class = lock_chain_get_class(chain, i); | |
8bfe0298 RV |
143 | if (!class->key) |
144 | continue; | |
145 | ||
443cd507 HY |
146 | seq_printf(m, "[%p] ", class->key); |
147 | print_name(m, class); | |
148 | seq_puts(m, "\n"); | |
149 | } | |
150 | seq_puts(m, "\n"); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static const struct seq_operations lockdep_chains_ops = { | |
156 | .start = lc_start, | |
157 | .next = lc_next, | |
158 | .stop = lc_stop, | |
159 | .show = lc_show, | |
160 | }; | |
cd1a28e8 | 161 | #endif /* CONFIG_PROVE_LOCKING */ |
443cd507 | 162 | |
a8f24a39 IM |
163 | static void lockdep_stats_debug_show(struct seq_file *m) |
164 | { | |
165 | #ifdef CONFIG_DEBUG_LOCKDEP | |
bd6d29c2 FW |
166 | unsigned long long hi1 = debug_atomic_read(hardirqs_on_events), |
167 | hi2 = debug_atomic_read(hardirqs_off_events), | |
168 | hr1 = debug_atomic_read(redundant_hardirqs_on), | |
169 | hr2 = debug_atomic_read(redundant_hardirqs_off), | |
170 | si1 = debug_atomic_read(softirqs_on_events), | |
171 | si2 = debug_atomic_read(softirqs_off_events), | |
172 | sr1 = debug_atomic_read(redundant_softirqs_on), | |
173 | sr2 = debug_atomic_read(redundant_softirqs_off); | |
174 | ||
175 | seq_printf(m, " chain lookup misses: %11llu\n", | |
176 | debug_atomic_read(chain_lookup_misses)); | |
177 | seq_printf(m, " chain lookup hits: %11llu\n", | |
178 | debug_atomic_read(chain_lookup_hits)); | |
179 | seq_printf(m, " cyclic checks: %11llu\n", | |
180 | debug_atomic_read(nr_cyclic_checks)); | |
ae813308 PZ |
181 | seq_printf(m, " redundant checks: %11llu\n", |
182 | debug_atomic_read(nr_redundant_checks)); | |
183 | seq_printf(m, " redundant links: %11llu\n", | |
184 | debug_atomic_read(nr_redundant)); | |
bd6d29c2 FW |
185 | seq_printf(m, " find-mask forwards checks: %11llu\n", |
186 | debug_atomic_read(nr_find_usage_forwards_checks)); | |
187 | seq_printf(m, " find-mask backwards checks: %11llu\n", | |
188 | debug_atomic_read(nr_find_usage_backwards_checks)); | |
189 | ||
190 | seq_printf(m, " hardirq on events: %11llu\n", hi1); | |
191 | seq_printf(m, " hardirq off events: %11llu\n", hi2); | |
192 | seq_printf(m, " redundant hardirq ons: %11llu\n", hr1); | |
193 | seq_printf(m, " redundant hardirq offs: %11llu\n", hr2); | |
194 | seq_printf(m, " softirq on events: %11llu\n", si1); | |
195 | seq_printf(m, " softirq off events: %11llu\n", si2); | |
196 | seq_printf(m, " redundant softirq ons: %11llu\n", sr1); | |
197 | seq_printf(m, " redundant softirq offs: %11llu\n", sr2); | |
a8f24a39 IM |
198 | #endif |
199 | } | |
200 | ||
201 | static int lockdep_stats_show(struct seq_file *m, void *v) | |
202 | { | |
a8f24a39 IM |
203 | unsigned long nr_unused = 0, nr_uncategorized = 0, |
204 | nr_irq_safe = 0, nr_irq_unsafe = 0, | |
205 | nr_softirq_safe = 0, nr_softirq_unsafe = 0, | |
206 | nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, | |
207 | nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, | |
208 | nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, | |
209 | nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, | |
dec29608 | 210 | sum_forward_deps = 0; |
a8f24a39 | 211 | |
68d41d8c | 212 | #ifdef CONFIG_PROVE_LOCKING |
68037aa7 AB |
213 | struct lock_class *class; |
214 | ||
a8f24a39 IM |
215 | list_for_each_entry(class, &all_lock_classes, lock_entry) { |
216 | ||
217 | if (class->usage_mask == 0) | |
218 | nr_unused++; | |
219 | if (class->usage_mask == LOCKF_USED) | |
220 | nr_uncategorized++; | |
221 | if (class->usage_mask & LOCKF_USED_IN_IRQ) | |
222 | nr_irq_safe++; | |
4fc95e86 | 223 | if (class->usage_mask & LOCKF_ENABLED_IRQ) |
a8f24a39 IM |
224 | nr_irq_unsafe++; |
225 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) | |
226 | nr_softirq_safe++; | |
4fc95e86 | 227 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ) |
a8f24a39 IM |
228 | nr_softirq_unsafe++; |
229 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) | |
230 | nr_hardirq_safe++; | |
4fc95e86 | 231 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ) |
a8f24a39 IM |
232 | nr_hardirq_unsafe++; |
233 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) | |
234 | nr_irq_read_safe++; | |
4fc95e86 | 235 | if (class->usage_mask & LOCKF_ENABLED_IRQ_READ) |
a8f24a39 IM |
236 | nr_irq_read_unsafe++; |
237 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) | |
238 | nr_softirq_read_safe++; | |
4fc95e86 | 239 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ) |
a8f24a39 IM |
240 | nr_softirq_read_unsafe++; |
241 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) | |
242 | nr_hardirq_read_safe++; | |
4fc95e86 | 243 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ) |
a8f24a39 IM |
244 | nr_hardirq_read_unsafe++; |
245 | ||
419ca3f1 | 246 | sum_forward_deps += lockdep_count_forward_deps(class); |
a8f24a39 | 247 | } |
501b9ebf | 248 | #ifdef CONFIG_DEBUG_LOCKDEP |
bd6d29c2 | 249 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused); |
68d41d8c YD |
250 | #endif |
251 | ||
a8f24a39 IM |
252 | #endif |
253 | seq_printf(m, " lock-classes: %11lu [max: %lu]\n", | |
254 | nr_lock_classes, MAX_LOCKDEP_KEYS); | |
255 | seq_printf(m, " direct dependencies: %11lu [max: %lu]\n", | |
256 | nr_list_entries, MAX_LOCKDEP_ENTRIES); | |
257 | seq_printf(m, " indirect dependencies: %11lu\n", | |
258 | sum_forward_deps); | |
259 | ||
260 | /* | |
261 | * Total number of dependencies: | |
262 | * | |
263 | * All irq-safe locks may nest inside irq-unsafe locks, | |
264 | * plus all the other known dependencies: | |
265 | */ | |
266 | seq_printf(m, " all direct dependencies: %11lu\n", | |
267 | nr_irq_unsafe * nr_irq_safe + | |
268 | nr_hardirq_unsafe * nr_hardirq_safe + | |
269 | nr_list_entries); | |
270 | ||
8e18257d | 271 | #ifdef CONFIG_PROVE_LOCKING |
a8f24a39 | 272 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n", |
2212684a | 273 | lock_chain_count(), MAX_LOCKDEP_CHAINS); |
443cd507 | 274 | seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n", |
cd1a28e8 | 275 | nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS); |
8e18257d | 276 | #endif |
a8f24a39 IM |
277 | |
278 | #ifdef CONFIG_TRACE_IRQFLAGS | |
279 | seq_printf(m, " in-hardirq chains: %11u\n", | |
280 | nr_hardirq_chains); | |
281 | seq_printf(m, " in-softirq chains: %11u\n", | |
282 | nr_softirq_chains); | |
283 | #endif | |
284 | seq_printf(m, " in-process chains: %11u\n", | |
285 | nr_process_chains); | |
286 | seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n", | |
287 | nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); | |
288 | seq_printf(m, " combined max dependencies: %11u\n", | |
289 | (nr_hardirq_chains + 1) * | |
290 | (nr_softirq_chains + 1) * | |
291 | (nr_process_chains + 1) | |
292 | ); | |
293 | seq_printf(m, " hardirq-safe locks: %11lu\n", | |
294 | nr_hardirq_safe); | |
295 | seq_printf(m, " hardirq-unsafe locks: %11lu\n", | |
296 | nr_hardirq_unsafe); | |
297 | seq_printf(m, " softirq-safe locks: %11lu\n", | |
298 | nr_softirq_safe); | |
299 | seq_printf(m, " softirq-unsafe locks: %11lu\n", | |
300 | nr_softirq_unsafe); | |
301 | seq_printf(m, " irq-safe locks: %11lu\n", | |
302 | nr_irq_safe); | |
303 | seq_printf(m, " irq-unsafe locks: %11lu\n", | |
304 | nr_irq_unsafe); | |
305 | ||
306 | seq_printf(m, " hardirq-read-safe locks: %11lu\n", | |
307 | nr_hardirq_read_safe); | |
308 | seq_printf(m, " hardirq-read-unsafe locks: %11lu\n", | |
309 | nr_hardirq_read_unsafe); | |
310 | seq_printf(m, " softirq-read-safe locks: %11lu\n", | |
311 | nr_softirq_read_safe); | |
312 | seq_printf(m, " softirq-read-unsafe locks: %11lu\n", | |
313 | nr_softirq_read_unsafe); | |
314 | seq_printf(m, " irq-read-safe locks: %11lu\n", | |
315 | nr_irq_read_safe); | |
316 | seq_printf(m, " irq-read-unsafe locks: %11lu\n", | |
317 | nr_irq_read_unsafe); | |
318 | ||
319 | seq_printf(m, " uncategorized locks: %11lu\n", | |
320 | nr_uncategorized); | |
321 | seq_printf(m, " unused locks: %11lu\n", | |
322 | nr_unused); | |
323 | seq_printf(m, " max locking depth: %11u\n", | |
324 | max_lockdep_depth); | |
bbfa2622 | 325 | #ifdef CONFIG_PROVE_LOCKING |
12f3dfd0 ML |
326 | seq_printf(m, " max bfs queue depth: %11u\n", |
327 | max_bfs_queue_depth); | |
bbfa2622 | 328 | #endif |
a8f24a39 IM |
329 | lockdep_stats_debug_show(m); |
330 | seq_printf(m, " debug_locks: %11u\n", | |
331 | debug_locks); | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
c46261de PZ |
336 | #ifdef CONFIG_LOCK_STAT |
337 | ||
338 | struct lock_stat_data { | |
339 | struct lock_class *class; | |
340 | struct lock_class_stats stats; | |
341 | }; | |
342 | ||
343 | struct lock_stat_seq { | |
c46261de PZ |
344 | struct lock_stat_data *iter_end; |
345 | struct lock_stat_data stats[MAX_LOCKDEP_KEYS]; | |
346 | }; | |
347 | ||
348 | /* | |
349 | * sort on absolute number of contentions | |
350 | */ | |
351 | static int lock_stat_cmp(const void *l, const void *r) | |
352 | { | |
353 | const struct lock_stat_data *dl = l, *dr = r; | |
354 | unsigned long nl, nr; | |
355 | ||
356 | nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr; | |
357 | nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr; | |
358 | ||
359 | return nr - nl; | |
360 | } | |
361 | ||
362 | static void seq_line(struct seq_file *m, char c, int offset, int length) | |
363 | { | |
364 | int i; | |
365 | ||
366 | for (i = 0; i < offset; i++) | |
367 | seq_puts(m, " "); | |
368 | for (i = 0; i < length; i++) | |
369 | seq_printf(m, "%c", c); | |
370 | seq_puts(m, "\n"); | |
371 | } | |
372 | ||
373 | static void snprint_time(char *buf, size_t bufsiz, s64 nr) | |
374 | { | |
6918bc5c PZ |
375 | s64 div; |
376 | s32 rem; | |
c46261de | 377 | |
2189459d | 378 | nr += 5; /* for display rounding */ |
6918bc5c PZ |
379 | div = div_s64_rem(nr, 1000, &rem); |
380 | snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10); | |
c46261de PZ |
381 | } |
382 | ||
383 | static void seq_time(struct seq_file *m, s64 time) | |
384 | { | |
385 | char num[15]; | |
386 | ||
387 | snprint_time(num, sizeof(num), time); | |
388 | seq_printf(m, " %14s", num); | |
389 | } | |
390 | ||
391 | static void seq_lock_time(struct seq_file *m, struct lock_time *lt) | |
392 | { | |
393 | seq_printf(m, "%14lu", lt->nr); | |
394 | seq_time(m, lt->min); | |
395 | seq_time(m, lt->max); | |
396 | seq_time(m, lt->total); | |
838cc7b4 | 397 | seq_time(m, lt->nr ? div_s64(lt->total, lt->nr) : 0); |
c46261de PZ |
398 | } |
399 | ||
400 | static void seq_stats(struct seq_file *m, struct lock_stat_data *data) | |
401 | { | |
cee34d88 | 402 | struct lockdep_subclass_key *ckey; |
c46261de | 403 | struct lock_class_stats *stats; |
cee34d88 PZ |
404 | struct lock_class *class; |
405 | const char *cname; | |
c46261de | 406 | int i, namelen; |
cee34d88 | 407 | char name[39]; |
c46261de PZ |
408 | |
409 | class = data->class; | |
410 | stats = &data->stats; | |
411 | ||
d38e1d5a PZ |
412 | namelen = 38; |
413 | if (class->name_version > 1) | |
414 | namelen -= 2; /* XXX truncates versions > 9 */ | |
415 | if (class->subclass) | |
416 | namelen -= 2; | |
417 | ||
cee34d88 PZ |
418 | rcu_read_lock_sched(); |
419 | cname = rcu_dereference_sched(class->name); | |
420 | ckey = rcu_dereference_sched(class->key); | |
421 | ||
422 | if (!cname && !ckey) { | |
423 | rcu_read_unlock_sched(); | |
424 | return; | |
425 | ||
426 | } else if (!cname) { | |
d38e1d5a PZ |
427 | char str[KSYM_NAME_LEN]; |
428 | const char *key_name; | |
429 | ||
cee34d88 | 430 | key_name = __get_key_name(ckey, str); |
d38e1d5a PZ |
431 | snprintf(name, namelen, "%s", key_name); |
432 | } else { | |
cee34d88 | 433 | snprintf(name, namelen, "%s", cname); |
d38e1d5a | 434 | } |
cee34d88 PZ |
435 | rcu_read_unlock_sched(); |
436 | ||
c46261de | 437 | namelen = strlen(name); |
d38e1d5a PZ |
438 | if (class->name_version > 1) { |
439 | snprintf(name+namelen, 3, "#%d", class->name_version); | |
440 | namelen += 2; | |
441 | } | |
442 | if (class->subclass) { | |
443 | snprintf(name+namelen, 3, "/%d", class->subclass); | |
444 | namelen += 2; | |
445 | } | |
c46261de PZ |
446 | |
447 | if (stats->write_holdtime.nr) { | |
448 | if (stats->read_holdtime.nr) | |
449 | seq_printf(m, "%38s-W:", name); | |
450 | else | |
451 | seq_printf(m, "%40s:", name); | |
452 | ||
96645678 | 453 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); |
c46261de | 454 | seq_lock_time(m, &stats->write_waittime); |
96645678 | 455 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); |
c46261de PZ |
456 | seq_lock_time(m, &stats->write_holdtime); |
457 | seq_puts(m, "\n"); | |
458 | } | |
459 | ||
460 | if (stats->read_holdtime.nr) { | |
461 | seq_printf(m, "%38s-R:", name); | |
96645678 | 462 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); |
c46261de | 463 | seq_lock_time(m, &stats->read_waittime); |
96645678 | 464 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); |
c46261de PZ |
465 | seq_lock_time(m, &stats->read_holdtime); |
466 | seq_puts(m, "\n"); | |
467 | } | |
468 | ||
469 | if (stats->read_waittime.nr + stats->write_waittime.nr == 0) | |
470 | return; | |
471 | ||
472 | if (stats->read_holdtime.nr) | |
473 | namelen += 2; | |
474 | ||
c7e78cff | 475 | for (i = 0; i < LOCKSTAT_POINTS; i++) { |
c46261de PZ |
476 | char ip[32]; |
477 | ||
478 | if (class->contention_point[i] == 0) | |
479 | break; | |
480 | ||
481 | if (!i) | |
482 | seq_line(m, '-', 40-namelen, namelen); | |
483 | ||
c46261de PZ |
484 | snprintf(ip, sizeof(ip), "[<%p>]", |
485 | (void *)class->contention_point[i]); | |
3cf9b85b JP |
486 | seq_printf(m, "%40s %14lu %29s %pS\n", |
487 | name, stats->contention_point[i], | |
488 | ip, (void *)class->contention_point[i]); | |
c46261de | 489 | } |
c7e78cff | 490 | for (i = 0; i < LOCKSTAT_POINTS; i++) { |
c7e78cff PZ |
491 | char ip[32]; |
492 | ||
493 | if (class->contending_point[i] == 0) | |
494 | break; | |
495 | ||
496 | if (!i) | |
497 | seq_line(m, '-', 40-namelen, namelen); | |
498 | ||
c7e78cff PZ |
499 | snprintf(ip, sizeof(ip), "[<%p>]", |
500 | (void *)class->contending_point[i]); | |
3cf9b85b JP |
501 | seq_printf(m, "%40s %14lu %29s %pS\n", |
502 | name, stats->contending_point[i], | |
503 | ip, (void *)class->contending_point[i]); | |
c7e78cff | 504 | } |
c46261de PZ |
505 | if (i) { |
506 | seq_puts(m, "\n"); | |
1232e380 | 507 | seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1)); |
c46261de PZ |
508 | seq_puts(m, "\n"); |
509 | } | |
510 | } | |
511 | ||
512 | static void seq_header(struct seq_file *m) | |
513 | { | |
1232e380 | 514 | seq_puts(m, "lock_stat version 0.4\n"); |
9833f8cb PZ |
515 | |
516 | if (unlikely(!debug_locks)) | |
517 | seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n"); | |
518 | ||
1232e380 DB |
519 | seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1)); |
520 | seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s " | |
96645678 | 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", | |
1232e380 | 528 | "waittime-avg", |
96645678 | 529 | "acq-bounces", |
c46261de PZ |
530 | "acquisitions", |
531 | "holdtime-min", | |
532 | "holdtime-max", | |
1232e380 DB |
533 | "holdtime-total", |
534 | "holdtime-avg"); | |
535 | seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1)); | |
c46261de PZ |
536 | seq_printf(m, "\n"); |
537 | } | |
538 | ||
539 | static void *ls_start(struct seq_file *m, loff_t *pos) | |
540 | { | |
541 | struct lock_stat_seq *data = m->private; | |
96004bb2 | 542 | struct lock_stat_data *iter; |
c46261de | 543 | |
94c61c0a TP |
544 | if (*pos == 0) |
545 | return SEQ_START_TOKEN; | |
c46261de | 546 | |
96004bb2 LZ |
547 | iter = data->stats + (*pos - 1); |
548 | if (iter >= data->iter_end) | |
549 | iter = NULL; | |
4b32d0a4 | 550 | |
96004bb2 | 551 | return iter; |
c46261de PZ |
552 | } |
553 | ||
554 | static void *ls_next(struct seq_file *m, void *v, loff_t *pos) | |
555 | { | |
c46261de | 556 | (*pos)++; |
96004bb2 | 557 | return ls_start(m, pos); |
c46261de PZ |
558 | } |
559 | ||
560 | static void ls_stop(struct seq_file *m, void *v) | |
561 | { | |
562 | } | |
563 | ||
564 | static int ls_show(struct seq_file *m, void *v) | |
565 | { | |
94c61c0a TP |
566 | if (v == SEQ_START_TOKEN) |
567 | seq_header(m); | |
568 | else | |
569 | seq_stats(m, v); | |
c46261de | 570 | |
c46261de PZ |
571 | return 0; |
572 | } | |
573 | ||
88e9d34c | 574 | static const struct seq_operations lockstat_ops = { |
c46261de PZ |
575 | .start = ls_start, |
576 | .next = ls_next, | |
577 | .stop = ls_stop, | |
578 | .show = ls_show, | |
579 | }; | |
580 | ||
581 | static int lock_stat_open(struct inode *inode, struct file *file) | |
582 | { | |
583 | int res; | |
584 | struct lock_class *class; | |
585 | struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); | |
586 | ||
587 | if (!data) | |
588 | return -ENOMEM; | |
589 | ||
590 | res = seq_open(file, &lockstat_ops); | |
591 | if (!res) { | |
592 | struct lock_stat_data *iter = data->stats; | |
593 | struct seq_file *m = file->private_data; | |
594 | ||
c46261de PZ |
595 | list_for_each_entry(class, &all_lock_classes, lock_entry) { |
596 | iter->class = class; | |
597 | iter->stats = lock_stats(class); | |
598 | iter++; | |
599 | } | |
600 | data->iter_end = iter; | |
601 | ||
96004bb2 | 602 | sort(data->stats, data->iter_end - data->stats, |
c46261de PZ |
603 | sizeof(struct lock_stat_data), |
604 | lock_stat_cmp, NULL); | |
605 | ||
606 | m->private = data; | |
607 | } else | |
608 | vfree(data); | |
609 | ||
610 | return res; | |
611 | } | |
612 | ||
613 | static ssize_t lock_stat_write(struct file *file, const char __user *buf, | |
614 | size_t count, loff_t *ppos) | |
615 | { | |
616 | struct lock_class *class; | |
617 | char c; | |
618 | ||
619 | if (count) { | |
620 | if (get_user(c, buf)) | |
621 | return -EFAULT; | |
622 | ||
623 | if (c != '0') | |
624 | return count; | |
625 | ||
626 | list_for_each_entry(class, &all_lock_classes, lock_entry) | |
627 | clear_lock_stats(class); | |
628 | } | |
629 | return count; | |
630 | } | |
631 | ||
632 | static int lock_stat_release(struct inode *inode, struct file *file) | |
633 | { | |
634 | struct seq_file *seq = file->private_data; | |
635 | ||
636 | vfree(seq->private); | |
c46261de PZ |
637 | return seq_release(inode, file); |
638 | } | |
639 | ||
640 | static const struct file_operations proc_lock_stat_operations = { | |
641 | .open = lock_stat_open, | |
642 | .write = lock_stat_write, | |
643 | .read = seq_read, | |
644 | .llseek = seq_lseek, | |
645 | .release = lock_stat_release, | |
646 | }; | |
647 | #endif /* CONFIG_LOCK_STAT */ | |
648 | ||
a8f24a39 IM |
649 | static int __init lockdep_proc_init(void) |
650 | { | |
fddda2b7 | 651 | proc_create_seq("lockdep", S_IRUSR, NULL, &lockdep_ops); |
cd1a28e8 | 652 | #ifdef CONFIG_PROVE_LOCKING |
fddda2b7 | 653 | proc_create_seq("lockdep_chains", S_IRUSR, NULL, &lockdep_chains_ops); |
cd1a28e8 | 654 | #endif |
3f3942ac | 655 | proc_create_single("lockdep_stats", S_IRUSR, NULL, lockdep_stats_show); |
c46261de | 656 | #ifdef CONFIG_LOCK_STAT |
9795447f LZ |
657 | proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL, |
658 | &proc_lock_stat_operations); | |
c46261de PZ |
659 | #endif |
660 | ||
a8f24a39 IM |
661 | return 0; |
662 | } | |
663 | ||
664 | __initcall(lockdep_proc_init); | |
665 |