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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 | * | |
8 | * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> | |
9 | * | |
10 | * Code for /proc/lockdep and /proc/lockdep_stats: | |
11 | * | |
12 | */ | |
13 | #include <linux/sched.h> | |
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> | |
19 | ||
20 | #include "lockdep_internals.h" | |
21 | ||
22 | static void *l_next(struct seq_file *m, void *v, loff_t *pos) | |
23 | { | |
24 | struct lock_class *class = v; | |
25 | ||
26 | (*pos)++; | |
27 | ||
28 | if (class->lock_entry.next != &all_lock_classes) | |
29 | class = list_entry(class->lock_entry.next, struct lock_class, | |
30 | lock_entry); | |
31 | else | |
32 | class = NULL; | |
33 | m->private = class; | |
34 | ||
35 | return class; | |
36 | } | |
37 | ||
38 | static void *l_start(struct seq_file *m, loff_t *pos) | |
39 | { | |
40 | struct lock_class *class = m->private; | |
41 | ||
42 | if (&class->lock_entry == all_lock_classes.next) | |
43 | seq_printf(m, "all lock classes:\n"); | |
44 | ||
45 | return class; | |
46 | } | |
47 | ||
48 | static void l_stop(struct seq_file *m, void *v) | |
49 | { | |
50 | } | |
51 | ||
52 | static unsigned long count_forward_deps(struct lock_class *class) | |
53 | { | |
54 | struct lock_list *entry; | |
55 | unsigned long ret = 1; | |
56 | ||
57 | /* | |
58 | * Recurse this class's dependency list: | |
59 | */ | |
60 | list_for_each_entry(entry, &class->locks_after, entry) | |
61 | ret += count_forward_deps(entry->class); | |
62 | ||
63 | return ret; | |
64 | } | |
65 | ||
66 | static unsigned long count_backward_deps(struct lock_class *class) | |
67 | { | |
68 | struct lock_list *entry; | |
69 | unsigned long ret = 1; | |
70 | ||
71 | /* | |
72 | * Recurse this class's dependency list: | |
73 | */ | |
74 | list_for_each_entry(entry, &class->locks_before, entry) | |
75 | ret += count_backward_deps(entry->class); | |
76 | ||
77 | return ret; | |
78 | } | |
79 | ||
068135e6 JB |
80 | static void print_name(struct seq_file *m, struct lock_class *class) |
81 | { | |
82 | char str[128]; | |
83 | const char *name = class->name; | |
84 | ||
85 | if (!name) { | |
86 | name = __get_key_name(class->key, str); | |
87 | seq_printf(m, "%s", name); | |
88 | } else{ | |
89 | seq_printf(m, "%s", name); | |
90 | if (class->name_version > 1) | |
91 | seq_printf(m, "#%d", class->name_version); | |
92 | if (class->subclass) | |
93 | seq_printf(m, "/%d", class->subclass); | |
94 | } | |
95 | } | |
96 | ||
a8f24a39 IM |
97 | static int l_show(struct seq_file *m, void *v) |
98 | { | |
99 | unsigned long nr_forward_deps, nr_backward_deps; | |
100 | struct lock_class *class = m->private; | |
068135e6 JB |
101 | struct lock_list *entry; |
102 | char c1, c2, c3, c4; | |
a8f24a39 IM |
103 | |
104 | seq_printf(m, "%p", class->key); | |
105 | #ifdef CONFIG_DEBUG_LOCKDEP | |
106 | seq_printf(m, " OPS:%8ld", class->ops); | |
107 | #endif | |
108 | nr_forward_deps = count_forward_deps(class); | |
109 | seq_printf(m, " FD:%5ld", nr_forward_deps); | |
110 | ||
111 | nr_backward_deps = count_backward_deps(class); | |
112 | seq_printf(m, " BD:%5ld", nr_backward_deps); | |
113 | ||
114 | get_usage_chars(class, &c1, &c2, &c3, &c4); | |
115 | seq_printf(m, " %c%c%c%c", c1, c2, c3, c4); | |
116 | ||
068135e6 JB |
117 | seq_printf(m, ": "); |
118 | print_name(m, class); | |
119 | seq_puts(m, "\n"); | |
120 | ||
121 | list_for_each_entry(entry, &class->locks_after, entry) { | |
122 | if (entry->distance == 1) { | |
123 | seq_printf(m, " -> [%p] ", entry->class); | |
124 | print_name(m, entry->class); | |
125 | seq_puts(m, "\n"); | |
126 | } | |
a8f24a39 IM |
127 | } |
128 | seq_puts(m, "\n"); | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
15ad7cdc | 133 | static const struct seq_operations lockdep_ops = { |
a8f24a39 IM |
134 | .start = l_start, |
135 | .next = l_next, | |
136 | .stop = l_stop, | |
137 | .show = l_show, | |
138 | }; | |
139 | ||
140 | static int lockdep_open(struct inode *inode, struct file *file) | |
141 | { | |
142 | int res = seq_open(file, &lockdep_ops); | |
143 | if (!res) { | |
144 | struct seq_file *m = file->private_data; | |
145 | ||
146 | if (!list_empty(&all_lock_classes)) | |
147 | m->private = list_entry(all_lock_classes.next, | |
148 | struct lock_class, lock_entry); | |
149 | else | |
150 | m->private = NULL; | |
151 | } | |
152 | return res; | |
153 | } | |
154 | ||
15ad7cdc | 155 | static const struct file_operations proc_lockdep_operations = { |
a8f24a39 IM |
156 | .open = lockdep_open, |
157 | .read = seq_read, | |
158 | .llseek = seq_lseek, | |
159 | .release = seq_release, | |
160 | }; | |
161 | ||
162 | static void lockdep_stats_debug_show(struct seq_file *m) | |
163 | { | |
164 | #ifdef CONFIG_DEBUG_LOCKDEP | |
165 | unsigned int hi1 = debug_atomic_read(&hardirqs_on_events), | |
166 | hi2 = debug_atomic_read(&hardirqs_off_events), | |
167 | hr1 = debug_atomic_read(&redundant_hardirqs_on), | |
168 | hr2 = debug_atomic_read(&redundant_hardirqs_off), | |
169 | si1 = debug_atomic_read(&softirqs_on_events), | |
170 | si2 = debug_atomic_read(&softirqs_off_events), | |
171 | sr1 = debug_atomic_read(&redundant_softirqs_on), | |
172 | sr2 = debug_atomic_read(&redundant_softirqs_off); | |
173 | ||
174 | seq_printf(m, " chain lookup misses: %11u\n", | |
175 | debug_atomic_read(&chain_lookup_misses)); | |
176 | seq_printf(m, " chain lookup hits: %11u\n", | |
177 | debug_atomic_read(&chain_lookup_hits)); | |
178 | seq_printf(m, " cyclic checks: %11u\n", | |
179 | debug_atomic_read(&nr_cyclic_checks)); | |
180 | seq_printf(m, " cyclic-check recursions: %11u\n", | |
181 | debug_atomic_read(&nr_cyclic_check_recursions)); | |
182 | seq_printf(m, " find-mask forwards checks: %11u\n", | |
183 | debug_atomic_read(&nr_find_usage_forwards_checks)); | |
184 | seq_printf(m, " find-mask forwards recursions: %11u\n", | |
185 | debug_atomic_read(&nr_find_usage_forwards_recursions)); | |
186 | seq_printf(m, " find-mask backwards checks: %11u\n", | |
187 | debug_atomic_read(&nr_find_usage_backwards_checks)); | |
188 | seq_printf(m, " find-mask backwards recursions:%11u\n", | |
189 | debug_atomic_read(&nr_find_usage_backwards_recursions)); | |
190 | ||
191 | seq_printf(m, " hardirq on events: %11u\n", hi1); | |
192 | seq_printf(m, " hardirq off events: %11u\n", hi2); | |
193 | seq_printf(m, " redundant hardirq ons: %11u\n", hr1); | |
194 | seq_printf(m, " redundant hardirq offs: %11u\n", hr2); | |
195 | seq_printf(m, " softirq on events: %11u\n", si1); | |
196 | seq_printf(m, " softirq off events: %11u\n", si2); | |
197 | seq_printf(m, " redundant softirq ons: %11u\n", sr1); | |
198 | seq_printf(m, " redundant softirq offs: %11u\n", sr2); | |
199 | #endif | |
200 | } | |
201 | ||
202 | static int lockdep_stats_show(struct seq_file *m, void *v) | |
203 | { | |
204 | struct lock_class *class; | |
205 | unsigned long nr_unused = 0, nr_uncategorized = 0, | |
206 | nr_irq_safe = 0, nr_irq_unsafe = 0, | |
207 | nr_softirq_safe = 0, nr_softirq_unsafe = 0, | |
208 | nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, | |
209 | nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, | |
210 | nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, | |
211 | nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, | |
212 | sum_forward_deps = 0, factor = 0; | |
213 | ||
214 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
215 | ||
216 | if (class->usage_mask == 0) | |
217 | nr_unused++; | |
218 | if (class->usage_mask == LOCKF_USED) | |
219 | nr_uncategorized++; | |
220 | if (class->usage_mask & LOCKF_USED_IN_IRQ) | |
221 | nr_irq_safe++; | |
222 | if (class->usage_mask & LOCKF_ENABLED_IRQS) | |
223 | nr_irq_unsafe++; | |
224 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) | |
225 | nr_softirq_safe++; | |
226 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS) | |
227 | nr_softirq_unsafe++; | |
228 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) | |
229 | nr_hardirq_safe++; | |
230 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQS) | |
231 | nr_hardirq_unsafe++; | |
232 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) | |
233 | nr_irq_read_safe++; | |
234 | if (class->usage_mask & LOCKF_ENABLED_IRQS_READ) | |
235 | nr_irq_read_unsafe++; | |
236 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) | |
237 | nr_softirq_read_safe++; | |
238 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS_READ) | |
239 | nr_softirq_read_unsafe++; | |
240 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) | |
241 | nr_hardirq_read_safe++; | |
242 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQS_READ) | |
243 | nr_hardirq_read_unsafe++; | |
244 | ||
245 | sum_forward_deps += count_forward_deps(class); | |
246 | } | |
247 | #ifdef CONFIG_LOCKDEP_DEBUG | |
248 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(&nr_unused_locks) != nr_unused); | |
249 | #endif | |
250 | seq_printf(m, " lock-classes: %11lu [max: %lu]\n", | |
251 | nr_lock_classes, MAX_LOCKDEP_KEYS); | |
252 | seq_printf(m, " direct dependencies: %11lu [max: %lu]\n", | |
253 | nr_list_entries, MAX_LOCKDEP_ENTRIES); | |
254 | seq_printf(m, " indirect dependencies: %11lu\n", | |
255 | sum_forward_deps); | |
256 | ||
257 | /* | |
258 | * Total number of dependencies: | |
259 | * | |
260 | * All irq-safe locks may nest inside irq-unsafe locks, | |
261 | * plus all the other known dependencies: | |
262 | */ | |
263 | seq_printf(m, " all direct dependencies: %11lu\n", | |
264 | nr_irq_unsafe * nr_irq_safe + | |
265 | nr_hardirq_unsafe * nr_hardirq_safe + | |
266 | nr_list_entries); | |
267 | ||
268 | /* | |
269 | * Estimated factor between direct and indirect | |
270 | * dependencies: | |
271 | */ | |
272 | if (nr_list_entries) | |
273 | factor = sum_forward_deps / nr_list_entries; | |
274 | ||
275 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n", | |
276 | nr_lock_chains, MAX_LOCKDEP_CHAINS); | |
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); | |
325 | seq_printf(m, " max recursion depth: %11u\n", | |
326 | max_recursion_depth); | |
327 | lockdep_stats_debug_show(m); | |
328 | seq_printf(m, " debug_locks: %11u\n", | |
329 | debug_locks); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static int lockdep_stats_open(struct inode *inode, struct file *file) | |
335 | { | |
336 | return single_open(file, lockdep_stats_show, NULL); | |
337 | } | |
338 | ||
15ad7cdc | 339 | static const struct file_operations proc_lockdep_stats_operations = { |
a8f24a39 IM |
340 | .open = lockdep_stats_open, |
341 | .read = seq_read, | |
342 | .llseek = seq_lseek, | |
343 | .release = seq_release, | |
344 | }; | |
345 | ||
346 | static int __init lockdep_proc_init(void) | |
347 | { | |
348 | struct proc_dir_entry *entry; | |
349 | ||
350 | entry = create_proc_entry("lockdep", S_IRUSR, NULL); | |
351 | if (entry) | |
352 | entry->proc_fops = &proc_lockdep_operations; | |
353 | ||
354 | entry = create_proc_entry("lockdep_stats", S_IRUSR, NULL); | |
355 | if (entry) | |
356 | entry->proc_fops = &proc_lockdep_stats_operations; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | __initcall(lockdep_proc_init); | |
362 |