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