Commit | Line | Data |
---|---|---|
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 | { | |
cee34d88 | 429 | struct lockdep_subclass_key *ckey; |
c46261de | 430 | struct lock_class_stats *stats; |
cee34d88 PZ |
431 | struct lock_class *class; |
432 | const char *cname; | |
c46261de | 433 | int i, namelen; |
cee34d88 | 434 | char name[39]; |
c46261de PZ |
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 | ||
cee34d88 PZ |
445 | rcu_read_lock_sched(); |
446 | cname = rcu_dereference_sched(class->name); | |
447 | ckey = rcu_dereference_sched(class->key); | |
448 | ||
449 | if (!cname && !ckey) { | |
450 | rcu_read_unlock_sched(); | |
451 | return; | |
452 | ||
453 | } else if (!cname) { | |
d38e1d5a PZ |
454 | char str[KSYM_NAME_LEN]; |
455 | const char *key_name; | |
456 | ||
cee34d88 | 457 | key_name = __get_key_name(ckey, str); |
d38e1d5a PZ |
458 | snprintf(name, namelen, "%s", key_name); |
459 | } else { | |
cee34d88 | 460 | snprintf(name, namelen, "%s", cname); |
d38e1d5a | 461 | } |
cee34d88 PZ |
462 | rcu_read_unlock_sched(); |
463 | ||
c46261de | 464 | namelen = strlen(name); |
d38e1d5a PZ |
465 | if (class->name_version > 1) { |
466 | snprintf(name+namelen, 3, "#%d", class->name_version); | |
467 | namelen += 2; | |
468 | } | |
469 | if (class->subclass) { | |
470 | snprintf(name+namelen, 3, "/%d", class->subclass); | |
471 | namelen += 2; | |
472 | } | |
c46261de PZ |
473 | |
474 | if (stats->write_holdtime.nr) { | |
475 | if (stats->read_holdtime.nr) | |
476 | seq_printf(m, "%38s-W:", name); | |
477 | else | |
478 | seq_printf(m, "%40s:", name); | |
479 | ||
96645678 | 480 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); |
c46261de | 481 | seq_lock_time(m, &stats->write_waittime); |
96645678 | 482 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); |
c46261de PZ |
483 | seq_lock_time(m, &stats->write_holdtime); |
484 | seq_puts(m, "\n"); | |
485 | } | |
486 | ||
487 | if (stats->read_holdtime.nr) { | |
488 | seq_printf(m, "%38s-R:", name); | |
96645678 | 489 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); |
c46261de | 490 | seq_lock_time(m, &stats->read_waittime); |
96645678 | 491 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); |
c46261de PZ |
492 | seq_lock_time(m, &stats->read_holdtime); |
493 | seq_puts(m, "\n"); | |
494 | } | |
495 | ||
496 | if (stats->read_waittime.nr + stats->write_waittime.nr == 0) | |
497 | return; | |
498 | ||
499 | if (stats->read_holdtime.nr) | |
500 | namelen += 2; | |
501 | ||
c7e78cff | 502 | for (i = 0; i < LOCKSTAT_POINTS; i++) { |
c46261de PZ |
503 | char ip[32]; |
504 | ||
505 | if (class->contention_point[i] == 0) | |
506 | break; | |
507 | ||
508 | if (!i) | |
509 | seq_line(m, '-', 40-namelen, namelen); | |
510 | ||
c46261de PZ |
511 | snprintf(ip, sizeof(ip), "[<%p>]", |
512 | (void *)class->contention_point[i]); | |
3cf9b85b JP |
513 | seq_printf(m, "%40s %14lu %29s %pS\n", |
514 | name, stats->contention_point[i], | |
515 | ip, (void *)class->contention_point[i]); | |
c46261de | 516 | } |
c7e78cff | 517 | for (i = 0; i < LOCKSTAT_POINTS; i++) { |
c7e78cff PZ |
518 | char ip[32]; |
519 | ||
520 | if (class->contending_point[i] == 0) | |
521 | break; | |
522 | ||
523 | if (!i) | |
524 | seq_line(m, '-', 40-namelen, namelen); | |
525 | ||
c7e78cff PZ |
526 | snprintf(ip, sizeof(ip), "[<%p>]", |
527 | (void *)class->contending_point[i]); | |
3cf9b85b JP |
528 | seq_printf(m, "%40s %14lu %29s %pS\n", |
529 | name, stats->contending_point[i], | |
530 | ip, (void *)class->contending_point[i]); | |
c7e78cff | 531 | } |
c46261de PZ |
532 | if (i) { |
533 | seq_puts(m, "\n"); | |
1232e380 | 534 | seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1)); |
c46261de PZ |
535 | seq_puts(m, "\n"); |
536 | } | |
537 | } | |
538 | ||
539 | static void seq_header(struct seq_file *m) | |
540 | { | |
1232e380 | 541 | seq_puts(m, "lock_stat version 0.4\n"); |
9833f8cb PZ |
542 | |
543 | if (unlikely(!debug_locks)) | |
544 | seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n"); | |
545 | ||
1232e380 DB |
546 | seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1)); |
547 | seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s " | |
96645678 | 548 | "%14s %14s\n", |
c46261de | 549 | "class name", |
96645678 | 550 | "con-bounces", |
c46261de PZ |
551 | "contentions", |
552 | "waittime-min", | |
553 | "waittime-max", | |
554 | "waittime-total", | |
1232e380 | 555 | "waittime-avg", |
96645678 | 556 | "acq-bounces", |
c46261de PZ |
557 | "acquisitions", |
558 | "holdtime-min", | |
559 | "holdtime-max", | |
1232e380 DB |
560 | "holdtime-total", |
561 | "holdtime-avg"); | |
562 | seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1)); | |
c46261de PZ |
563 | seq_printf(m, "\n"); |
564 | } | |
565 | ||
566 | static void *ls_start(struct seq_file *m, loff_t *pos) | |
567 | { | |
568 | struct lock_stat_seq *data = m->private; | |
96004bb2 | 569 | struct lock_stat_data *iter; |
c46261de | 570 | |
94c61c0a TP |
571 | if (*pos == 0) |
572 | return SEQ_START_TOKEN; | |
c46261de | 573 | |
96004bb2 LZ |
574 | iter = data->stats + (*pos - 1); |
575 | if (iter >= data->iter_end) | |
576 | iter = NULL; | |
4b32d0a4 | 577 | |
96004bb2 | 578 | return iter; |
c46261de PZ |
579 | } |
580 | ||
581 | static void *ls_next(struct seq_file *m, void *v, loff_t *pos) | |
582 | { | |
c46261de | 583 | (*pos)++; |
96004bb2 | 584 | return ls_start(m, pos); |
c46261de PZ |
585 | } |
586 | ||
587 | static void ls_stop(struct seq_file *m, void *v) | |
588 | { | |
589 | } | |
590 | ||
591 | static int ls_show(struct seq_file *m, void *v) | |
592 | { | |
94c61c0a TP |
593 | if (v == SEQ_START_TOKEN) |
594 | seq_header(m); | |
595 | else | |
596 | seq_stats(m, v); | |
c46261de | 597 | |
c46261de PZ |
598 | return 0; |
599 | } | |
600 | ||
88e9d34c | 601 | static const struct seq_operations lockstat_ops = { |
c46261de PZ |
602 | .start = ls_start, |
603 | .next = ls_next, | |
604 | .stop = ls_stop, | |
605 | .show = ls_show, | |
606 | }; | |
607 | ||
608 | static int lock_stat_open(struct inode *inode, struct file *file) | |
609 | { | |
610 | int res; | |
611 | struct lock_class *class; | |
612 | struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); | |
613 | ||
614 | if (!data) | |
615 | return -ENOMEM; | |
616 | ||
617 | res = seq_open(file, &lockstat_ops); | |
618 | if (!res) { | |
619 | struct lock_stat_data *iter = data->stats; | |
620 | struct seq_file *m = file->private_data; | |
621 | ||
c46261de PZ |
622 | list_for_each_entry(class, &all_lock_classes, lock_entry) { |
623 | iter->class = class; | |
624 | iter->stats = lock_stats(class); | |
625 | iter++; | |
626 | } | |
627 | data->iter_end = iter; | |
628 | ||
96004bb2 | 629 | sort(data->stats, data->iter_end - data->stats, |
c46261de PZ |
630 | sizeof(struct lock_stat_data), |
631 | lock_stat_cmp, NULL); | |
632 | ||
633 | m->private = data; | |
634 | } else | |
635 | vfree(data); | |
636 | ||
637 | return res; | |
638 | } | |
639 | ||
640 | static ssize_t lock_stat_write(struct file *file, const char __user *buf, | |
641 | size_t count, loff_t *ppos) | |
642 | { | |
643 | struct lock_class *class; | |
644 | char c; | |
645 | ||
646 | if (count) { | |
647 | if (get_user(c, buf)) | |
648 | return -EFAULT; | |
649 | ||
650 | if (c != '0') | |
651 | return count; | |
652 | ||
653 | list_for_each_entry(class, &all_lock_classes, lock_entry) | |
654 | clear_lock_stats(class); | |
655 | } | |
656 | return count; | |
657 | } | |
658 | ||
659 | static int lock_stat_release(struct inode *inode, struct file *file) | |
660 | { | |
661 | struct seq_file *seq = file->private_data; | |
662 | ||
663 | vfree(seq->private); | |
c46261de PZ |
664 | return seq_release(inode, file); |
665 | } | |
666 | ||
667 | static const struct file_operations proc_lock_stat_operations = { | |
668 | .open = lock_stat_open, | |
669 | .write = lock_stat_write, | |
670 | .read = seq_read, | |
671 | .llseek = seq_lseek, | |
672 | .release = lock_stat_release, | |
673 | }; | |
674 | #endif /* CONFIG_LOCK_STAT */ | |
675 | ||
a8f24a39 IM |
676 | static int __init lockdep_proc_init(void) |
677 | { | |
c33fff0a | 678 | proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations); |
cd1a28e8 | 679 | #ifdef CONFIG_PROVE_LOCKING |
443cd507 HY |
680 | proc_create("lockdep_chains", S_IRUSR, NULL, |
681 | &proc_lockdep_chains_operations); | |
cd1a28e8 | 682 | #endif |
c33fff0a DL |
683 | proc_create("lockdep_stats", S_IRUSR, NULL, |
684 | &proc_lockdep_stats_operations); | |
a8f24a39 | 685 | |
c46261de | 686 | #ifdef CONFIG_LOCK_STAT |
9795447f LZ |
687 | proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL, |
688 | &proc_lock_stat_operations); | |
c46261de PZ |
689 | #endif |
690 | ||
a8f24a39 IM |
691 | return 0; |
692 | } | |
693 | ||
694 | __initcall(lockdep_proc_init); | |
695 |