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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 | */ | |
a8f24a39 IM |
13 | #include <linux/module.h> |
14 | #include <linux/proc_fs.h> | |
15 | #include <linux/seq_file.h> | |
16 | #include <linux/kallsyms.h> | |
17 | #include <linux/debug_locks.h> | |
18 | ||
19 | #include "lockdep_internals.h" | |
20 | ||
21 | static void *l_next(struct seq_file *m, void *v, loff_t *pos) | |
22 | { | |
23 | struct lock_class *class = v; | |
24 | ||
25 | (*pos)++; | |
26 | ||
27 | if (class->lock_entry.next != &all_lock_classes) | |
28 | class = list_entry(class->lock_entry.next, struct lock_class, | |
29 | lock_entry); | |
30 | else | |
31 | class = NULL; | |
32 | m->private = class; | |
33 | ||
34 | return class; | |
35 | } | |
36 | ||
37 | static void *l_start(struct seq_file *m, loff_t *pos) | |
38 | { | |
39 | struct lock_class *class = m->private; | |
40 | ||
41 | if (&class->lock_entry == all_lock_classes.next) | |
42 | seq_printf(m, "all lock classes:\n"); | |
43 | ||
44 | return class; | |
45 | } | |
46 | ||
47 | static void l_stop(struct seq_file *m, void *v) | |
48 | { | |
49 | } | |
50 | ||
51 | static unsigned long count_forward_deps(struct lock_class *class) | |
52 | { | |
53 | struct lock_list *entry; | |
54 | unsigned long ret = 1; | |
55 | ||
56 | /* | |
57 | * Recurse this class's dependency list: | |
58 | */ | |
59 | list_for_each_entry(entry, &class->locks_after, entry) | |
60 | ret += count_forward_deps(entry->class); | |
61 | ||
62 | return ret; | |
63 | } | |
64 | ||
65 | static unsigned long count_backward_deps(struct lock_class *class) | |
66 | { | |
67 | struct lock_list *entry; | |
68 | unsigned long ret = 1; | |
69 | ||
70 | /* | |
71 | * Recurse this class's dependency list: | |
72 | */ | |
73 | list_for_each_entry(entry, &class->locks_before, entry) | |
74 | ret += count_backward_deps(entry->class); | |
75 | ||
76 | return ret; | |
77 | } | |
78 | ||
068135e6 JB |
79 | static void print_name(struct seq_file *m, struct lock_class *class) |
80 | { | |
81 | char str[128]; | |
82 | const char *name = class->name; | |
83 | ||
84 | if (!name) { | |
85 | name = __get_key_name(class->key, str); | |
86 | seq_printf(m, "%s", name); | |
87 | } else{ | |
88 | seq_printf(m, "%s", name); | |
89 | if (class->name_version > 1) | |
90 | seq_printf(m, "#%d", class->name_version); | |
91 | if (class->subclass) | |
92 | seq_printf(m, "/%d", class->subclass); | |
93 | } | |
94 | } | |
95 | ||
a8f24a39 IM |
96 | static int l_show(struct seq_file *m, void *v) |
97 | { | |
98 | unsigned long nr_forward_deps, nr_backward_deps; | |
99 | struct lock_class *class = m->private; | |
068135e6 JB |
100 | struct lock_list *entry; |
101 | char c1, c2, c3, c4; | |
a8f24a39 IM |
102 | |
103 | seq_printf(m, "%p", class->key); | |
104 | #ifdef CONFIG_DEBUG_LOCKDEP | |
105 | seq_printf(m, " OPS:%8ld", class->ops); | |
106 | #endif | |
107 | nr_forward_deps = count_forward_deps(class); | |
108 | seq_printf(m, " FD:%5ld", nr_forward_deps); | |
109 | ||
110 | nr_backward_deps = count_backward_deps(class); | |
111 | seq_printf(m, " BD:%5ld", nr_backward_deps); | |
112 | ||
113 | get_usage_chars(class, &c1, &c2, &c3, &c4); | |
114 | seq_printf(m, " %c%c%c%c", c1, c2, c3, c4); | |
115 | ||
068135e6 JB |
116 | seq_printf(m, ": "); |
117 | print_name(m, class); | |
118 | seq_puts(m, "\n"); | |
119 | ||
120 | list_for_each_entry(entry, &class->locks_after, entry) { | |
121 | if (entry->distance == 1) { | |
122 | seq_printf(m, " -> [%p] ", entry->class); | |
123 | print_name(m, entry->class); | |
124 | seq_puts(m, "\n"); | |
125 | } | |
a8f24a39 IM |
126 | } |
127 | seq_puts(m, "\n"); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
15ad7cdc | 132 | static const struct seq_operations lockdep_ops = { |
a8f24a39 IM |
133 | .start = l_start, |
134 | .next = l_next, | |
135 | .stop = l_stop, | |
136 | .show = l_show, | |
137 | }; | |
138 | ||
139 | static int lockdep_open(struct inode *inode, struct file *file) | |
140 | { | |
141 | int res = seq_open(file, &lockdep_ops); | |
142 | if (!res) { | |
143 | struct seq_file *m = file->private_data; | |
144 | ||
145 | if (!list_empty(&all_lock_classes)) | |
146 | m->private = list_entry(all_lock_classes.next, | |
147 | struct lock_class, lock_entry); | |
148 | else | |
149 | m->private = NULL; | |
150 | } | |
151 | return res; | |
152 | } | |
153 | ||
15ad7cdc | 154 | static const struct file_operations proc_lockdep_operations = { |
a8f24a39 IM |
155 | .open = lockdep_open, |
156 | .read = seq_read, | |
157 | .llseek = seq_lseek, | |
158 | .release = seq_release, | |
159 | }; | |
160 | ||
161 | static void lockdep_stats_debug_show(struct seq_file *m) | |
162 | { | |
163 | #ifdef CONFIG_DEBUG_LOCKDEP | |
164 | unsigned int hi1 = debug_atomic_read(&hardirqs_on_events), | |
165 | hi2 = debug_atomic_read(&hardirqs_off_events), | |
166 | hr1 = debug_atomic_read(&redundant_hardirqs_on), | |
167 | hr2 = debug_atomic_read(&redundant_hardirqs_off), | |
168 | si1 = debug_atomic_read(&softirqs_on_events), | |
169 | si2 = debug_atomic_read(&softirqs_off_events), | |
170 | sr1 = debug_atomic_read(&redundant_softirqs_on), | |
171 | sr2 = debug_atomic_read(&redundant_softirqs_off); | |
172 | ||
173 | seq_printf(m, " chain lookup misses: %11u\n", | |
174 | debug_atomic_read(&chain_lookup_misses)); | |
175 | seq_printf(m, " chain lookup hits: %11u\n", | |
176 | debug_atomic_read(&chain_lookup_hits)); | |
177 | seq_printf(m, " cyclic checks: %11u\n", | |
178 | debug_atomic_read(&nr_cyclic_checks)); | |
179 | seq_printf(m, " cyclic-check recursions: %11u\n", | |
180 | debug_atomic_read(&nr_cyclic_check_recursions)); | |
181 | seq_printf(m, " find-mask forwards checks: %11u\n", | |
182 | debug_atomic_read(&nr_find_usage_forwards_checks)); | |
183 | seq_printf(m, " find-mask forwards recursions: %11u\n", | |
184 | debug_atomic_read(&nr_find_usage_forwards_recursions)); | |
185 | seq_printf(m, " find-mask backwards checks: %11u\n", | |
186 | debug_atomic_read(&nr_find_usage_backwards_checks)); | |
187 | seq_printf(m, " find-mask backwards recursions:%11u\n", | |
188 | debug_atomic_read(&nr_find_usage_backwards_recursions)); | |
189 | ||
190 | seq_printf(m, " hardirq on events: %11u\n", hi1); | |
191 | seq_printf(m, " hardirq off events: %11u\n", hi2); | |
192 | seq_printf(m, " redundant hardirq ons: %11u\n", hr1); | |
193 | seq_printf(m, " redundant hardirq offs: %11u\n", hr2); | |
194 | seq_printf(m, " softirq on events: %11u\n", si1); | |
195 | seq_printf(m, " softirq off events: %11u\n", si2); | |
196 | seq_printf(m, " redundant softirq ons: %11u\n", sr1); | |
197 | seq_printf(m, " redundant softirq offs: %11u\n", sr2); | |
198 | #endif | |
199 | } | |
200 | ||
201 | static int lockdep_stats_show(struct seq_file *m, void *v) | |
202 | { | |
203 | struct lock_class *class; | |
204 | unsigned long nr_unused = 0, nr_uncategorized = 0, | |
205 | nr_irq_safe = 0, nr_irq_unsafe = 0, | |
206 | nr_softirq_safe = 0, nr_softirq_unsafe = 0, | |
207 | nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, | |
208 | nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, | |
209 | nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, | |
210 | nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, | |
211 | sum_forward_deps = 0, factor = 0; | |
212 | ||
213 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
214 | ||
215 | if (class->usage_mask == 0) | |
216 | nr_unused++; | |
217 | if (class->usage_mask == LOCKF_USED) | |
218 | nr_uncategorized++; | |
219 | if (class->usage_mask & LOCKF_USED_IN_IRQ) | |
220 | nr_irq_safe++; | |
221 | if (class->usage_mask & LOCKF_ENABLED_IRQS) | |
222 | nr_irq_unsafe++; | |
223 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) | |
224 | nr_softirq_safe++; | |
225 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS) | |
226 | nr_softirq_unsafe++; | |
227 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) | |
228 | nr_hardirq_safe++; | |
229 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQS) | |
230 | nr_hardirq_unsafe++; | |
231 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) | |
232 | nr_irq_read_safe++; | |
233 | if (class->usage_mask & LOCKF_ENABLED_IRQS_READ) | |
234 | nr_irq_read_unsafe++; | |
235 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) | |
236 | nr_softirq_read_safe++; | |
237 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS_READ) | |
238 | nr_softirq_read_unsafe++; | |
239 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) | |
240 | nr_hardirq_read_safe++; | |
241 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQS_READ) | |
242 | nr_hardirq_read_unsafe++; | |
243 | ||
244 | sum_forward_deps += count_forward_deps(class); | |
245 | } | |
501b9ebf | 246 | #ifdef CONFIG_DEBUG_LOCKDEP |
a8f24a39 IM |
247 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(&nr_unused_locks) != nr_unused); |
248 | #endif | |
249 | seq_printf(m, " lock-classes: %11lu [max: %lu]\n", | |
250 | nr_lock_classes, MAX_LOCKDEP_KEYS); | |
251 | seq_printf(m, " direct dependencies: %11lu [max: %lu]\n", | |
252 | nr_list_entries, MAX_LOCKDEP_ENTRIES); | |
253 | seq_printf(m, " indirect dependencies: %11lu\n", | |
254 | sum_forward_deps); | |
255 | ||
256 | /* | |
257 | * Total number of dependencies: | |
258 | * | |
259 | * All irq-safe locks may nest inside irq-unsafe locks, | |
260 | * plus all the other known dependencies: | |
261 | */ | |
262 | seq_printf(m, " all direct dependencies: %11lu\n", | |
263 | nr_irq_unsafe * nr_irq_safe + | |
264 | nr_hardirq_unsafe * nr_hardirq_safe + | |
265 | nr_list_entries); | |
266 | ||
267 | /* | |
268 | * Estimated factor between direct and indirect | |
269 | * dependencies: | |
270 | */ | |
271 | if (nr_list_entries) | |
272 | factor = sum_forward_deps / nr_list_entries; | |
273 | ||
274 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n", | |
275 | nr_lock_chains, MAX_LOCKDEP_CHAINS); | |
276 | ||
277 | #ifdef CONFIG_TRACE_IRQFLAGS | |
278 | seq_printf(m, " in-hardirq chains: %11u\n", | |
279 | nr_hardirq_chains); | |
280 | seq_printf(m, " in-softirq chains: %11u\n", | |
281 | nr_softirq_chains); | |
282 | #endif | |
283 | seq_printf(m, " in-process chains: %11u\n", | |
284 | nr_process_chains); | |
285 | seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n", | |
286 | nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); | |
287 | seq_printf(m, " combined max dependencies: %11u\n", | |
288 | (nr_hardirq_chains + 1) * | |
289 | (nr_softirq_chains + 1) * | |
290 | (nr_process_chains + 1) | |
291 | ); | |
292 | seq_printf(m, " hardirq-safe locks: %11lu\n", | |
293 | nr_hardirq_safe); | |
294 | seq_printf(m, " hardirq-unsafe locks: %11lu\n", | |
295 | nr_hardirq_unsafe); | |
296 | seq_printf(m, " softirq-safe locks: %11lu\n", | |
297 | nr_softirq_safe); | |
298 | seq_printf(m, " softirq-unsafe locks: %11lu\n", | |
299 | nr_softirq_unsafe); | |
300 | seq_printf(m, " irq-safe locks: %11lu\n", | |
301 | nr_irq_safe); | |
302 | seq_printf(m, " irq-unsafe locks: %11lu\n", | |
303 | nr_irq_unsafe); | |
304 | ||
305 | seq_printf(m, " hardirq-read-safe locks: %11lu\n", | |
306 | nr_hardirq_read_safe); | |
307 | seq_printf(m, " hardirq-read-unsafe locks: %11lu\n", | |
308 | nr_hardirq_read_unsafe); | |
309 | seq_printf(m, " softirq-read-safe locks: %11lu\n", | |
310 | nr_softirq_read_safe); | |
311 | seq_printf(m, " softirq-read-unsafe locks: %11lu\n", | |
312 | nr_softirq_read_unsafe); | |
313 | seq_printf(m, " irq-read-safe locks: %11lu\n", | |
314 | nr_irq_read_safe); | |
315 | seq_printf(m, " irq-read-unsafe locks: %11lu\n", | |
316 | nr_irq_read_unsafe); | |
317 | ||
318 | seq_printf(m, " uncategorized locks: %11lu\n", | |
319 | nr_uncategorized); | |
320 | seq_printf(m, " unused locks: %11lu\n", | |
321 | nr_unused); | |
322 | seq_printf(m, " max locking depth: %11u\n", | |
323 | max_lockdep_depth); | |
324 | seq_printf(m, " max recursion depth: %11u\n", | |
325 | max_recursion_depth); | |
326 | lockdep_stats_debug_show(m); | |
327 | seq_printf(m, " debug_locks: %11u\n", | |
328 | debug_locks); | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | static int lockdep_stats_open(struct inode *inode, struct file *file) | |
334 | { | |
335 | return single_open(file, lockdep_stats_show, NULL); | |
336 | } | |
337 | ||
15ad7cdc | 338 | static const struct file_operations proc_lockdep_stats_operations = { |
a8f24a39 IM |
339 | .open = lockdep_stats_open, |
340 | .read = seq_read, | |
341 | .llseek = seq_lseek, | |
342 | .release = seq_release, | |
343 | }; | |
344 | ||
345 | static int __init lockdep_proc_init(void) | |
346 | { | |
347 | struct proc_dir_entry *entry; | |
348 | ||
349 | entry = create_proc_entry("lockdep", S_IRUSR, NULL); | |
350 | if (entry) | |
351 | entry->proc_fops = &proc_lockdep_operations; | |
352 | ||
353 | entry = create_proc_entry("lockdep_stats", S_IRUSR, NULL); | |
354 | if (entry) | |
355 | entry->proc_fops = &proc_lockdep_stats_operations; | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | __initcall(lockdep_proc_init); | |
361 |