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1 | /* |
2 | * lib/dynamic_debug.c |
3 | * |
4 | * make pr_debug()/dev_dbg() calls runtime configurable based upon their |
5 | * source module. |
6 | * |
7 | * Copyright (C) 2008 Jason Baron <jbaron@redhat.com> |
8 | * By Greg Banks <gnb@melbourne.sgi.com> |
9 | * Copyright (c) 2008 Silicon Graphics Inc. All Rights Reserved. |
10 | */ |
11 | |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> |
14 | #include <linux/moduleparam.h> |
15 | #include <linux/kallsyms.h> |
16 | #include <linux/version.h> |
17 | #include <linux/types.h> |
18 | #include <linux/mutex.h> |
19 | #include <linux/proc_fs.h> |
20 | #include <linux/seq_file.h> |
21 | #include <linux/list.h> |
22 | #include <linux/sysctl.h> |
23 | #include <linux/ctype.h> |
24 | #include <linux/string.h> |
25 | #include <linux/uaccess.h> |
26 | #include <linux/dynamic_debug.h> |
27 | #include <linux/debugfs.h> |
28 | #include <linux/slab.h> |
29 | #include <linux/jump_label.h> |
30 | |
31 | extern struct _ddebug __start___verbose[]; |
32 | extern struct _ddebug __stop___verbose[]; |
33 | |
34 | struct ddebug_table { |
35 | struct list_head link; |
36 | char *mod_name; |
37 | unsigned int num_ddebugs; |
38 | unsigned int num_enabled; |
39 | struct _ddebug *ddebugs; |
40 | }; |
41 | |
42 | struct ddebug_query { |
43 | const char *filename; |
44 | const char *module; |
45 | const char *function; |
46 | const char *format; |
47 | unsigned int first_lineno, last_lineno; |
48 | }; |
49 | |
50 | struct ddebug_iter { |
51 | struct ddebug_table *table; |
52 | unsigned int idx; |
53 | }; |
54 | |
55 | static DEFINE_MUTEX(ddebug_lock); |
56 | static LIST_HEAD(ddebug_tables); |
57 | static int verbose = 0; |
58 | |
59 | /* Return the last part of a pathname */ |
60 | static inline const char *basename(const char *path) |
61 | { |
62 | const char *tail = strrchr(path, '/'); |
63 | return tail ? tail+1 : path; |
64 | } |
65 | |
66 | /* format a string into buf[] which describes the _ddebug's flags */ |
67 | static char *ddebug_describe_flags(struct _ddebug *dp, char *buf, |
68 | size_t maxlen) |
69 | { |
70 | char *p = buf; |
71 | |
72 | BUG_ON(maxlen < 4); |
73 | if (dp->flags & _DPRINTK_FLAGS_PRINT) |
74 | *p++ = 'p'; |
75 | if (p == buf) |
76 | *p++ = '-'; |
77 | *p = '\0'; |
78 | |
79 | return buf; |
80 | } |
81 | |
82 | /* |
83 | * Search the tables for _ddebug's which match the given |
84 | * `query' and apply the `flags' and `mask' to them. Tells |
85 | * the user which ddebug's were changed, or whether none |
86 | * were matched. |
87 | */ |
88 | static void ddebug_change(const struct ddebug_query *query, |
89 | unsigned int flags, unsigned int mask) |
90 | { |
91 | int i; |
92 | struct ddebug_table *dt; |
93 | unsigned int newflags; |
94 | unsigned int nfound = 0; |
95 | char flagbuf[8]; |
96 | |
97 | /* search for matching ddebugs */ |
98 | mutex_lock(&ddebug_lock); |
99 | list_for_each_entry(dt, &ddebug_tables, link) { |
100 | |
101 | /* match against the module name */ |
102 | if (query->module != NULL && |
103 | strcmp(query->module, dt->mod_name)) |
104 | continue; |
105 | |
106 | for (i = 0 ; i < dt->num_ddebugs ; i++) { |
107 | struct _ddebug *dp = &dt->ddebugs[i]; |
108 | |
109 | /* match against the source filename */ |
110 | if (query->filename != NULL && |
111 | strcmp(query->filename, dp->filename) && |
112 | strcmp(query->filename, basename(dp->filename))) |
113 | continue; |
114 | |
115 | /* match against the function */ |
116 | if (query->function != NULL && |
117 | strcmp(query->function, dp->function)) |
118 | continue; |
119 | |
120 | /* match against the format */ |
121 | if (query->format != NULL && |
122 | strstr(dp->format, query->format) == NULL) |
123 | continue; |
124 | |
125 | /* match against the line number range */ |
126 | if (query->first_lineno && |
127 | dp->lineno < query->first_lineno) |
128 | continue; |
129 | if (query->last_lineno && |
130 | dp->lineno > query->last_lineno) |
131 | continue; |
132 | |
133 | nfound++; |
134 | |
135 | newflags = (dp->flags & mask) | flags; |
136 | if (newflags == dp->flags) |
137 | continue; |
138 | |
139 | if (!newflags) |
140 | dt->num_enabled--; |
141 | else if (!dp->flags) |
142 | dt->num_enabled++; |
143 | dp->flags = newflags; |
144 | if (newflags) |
145 | dp->enabled = 1; |
146 | else |
147 | dp->enabled = 0; |
148 | if (verbose) |
149 | printk(KERN_INFO |
150 | "ddebug: changed %s:%d [%s]%s %s\n", |
151 | dp->filename, dp->lineno, |
152 | dt->mod_name, dp->function, |
153 | ddebug_describe_flags(dp, flagbuf, |
154 | sizeof(flagbuf))); |
155 | } |
156 | } |
157 | mutex_unlock(&ddebug_lock); |
158 | |
159 | if (!nfound && verbose) |
160 | printk(KERN_INFO "ddebug: no matches for query\n"); |
161 | } |
162 | |
163 | /* |
164 | * Split the buffer `buf' into space-separated words. |
165 | * Handles simple " and ' quoting, i.e. without nested, |
166 | * embedded or escaped \". Return the number of words |
167 | * or <0 on error. |
168 | */ |
169 | static int ddebug_tokenize(char *buf, char *words[], int maxwords) |
170 | { |
171 | int nwords = 0; |
172 | |
173 | while (*buf) { |
174 | char *end; |
175 | |
176 | /* Skip leading whitespace */ |
177 | buf = skip_spaces(buf); |
178 | if (!*buf) |
179 | break; /* oh, it was trailing whitespace */ |
180 | |
181 | /* Run `end' over a word, either whitespace separated or quoted */ |
182 | if (*buf == '"' || *buf == '\'') { |
183 | int quote = *buf++; |
184 | for (end = buf ; *end && *end != quote ; end++) |
185 | ; |
186 | if (!*end) |
187 | return -EINVAL; /* unclosed quote */ |
188 | } else { |
189 | for (end = buf ; *end && !isspace(*end) ; end++) |
190 | ; |
191 | BUG_ON(end == buf); |
192 | } |
193 | /* Here `buf' is the start of the word, `end' is one past the end */ |
194 | |
195 | if (nwords == maxwords) |
196 | return -EINVAL; /* ran out of words[] before bytes */ |
197 | if (*end) |
198 | *end++ = '\0'; /* terminate the word */ |
199 | words[nwords++] = buf; |
200 | buf = end; |
201 | } |
202 | |
203 | if (verbose) { |
204 | int i; |
205 | printk(KERN_INFO "%s: split into words:", __func__); |
206 | for (i = 0 ; i < nwords ; i++) |
207 | printk(" \"%s\"", words[i]); |
208 | printk("\n"); |
209 | } |
210 | |
211 | return nwords; |
212 | } |
213 | |
214 | /* |
215 | * Parse a single line number. Note that the empty string "" |
216 | * is treated as a special case and converted to zero, which |
217 | * is later treated as a "don't care" value. |
218 | */ |
219 | static inline int parse_lineno(const char *str, unsigned int *val) |
220 | { |
221 | char *end = NULL; |
222 | BUG_ON(str == NULL); |
223 | if (*str == '\0') { |
224 | *val = 0; |
225 | return 0; |
226 | } |
227 | *val = simple_strtoul(str, &end, 10); |
228 | return end == NULL || end == str || *end != '\0' ? -EINVAL : 0; |
229 | } |
230 | |
231 | /* |
232 | * Undo octal escaping in a string, inplace. This is useful to |
233 | * allow the user to express a query which matches a format |
234 | * containing embedded spaces. |
235 | */ |
236 | #define isodigit(c) ((c) >= '0' && (c) <= '7') |
237 | static char *unescape(char *str) |
238 | { |
239 | char *in = str; |
240 | char *out = str; |
241 | |
242 | while (*in) { |
243 | if (*in == '\\') { |
244 | if (in[1] == '\\') { |
245 | *out++ = '\\'; |
246 | in += 2; |
247 | continue; |
248 | } else if (in[1] == 't') { |
249 | *out++ = '\t'; |
250 | in += 2; |
251 | continue; |
252 | } else if (in[1] == 'n') { |
253 | *out++ = '\n'; |
254 | in += 2; |
255 | continue; |
256 | } else if (isodigit(in[1]) && |
257 | isodigit(in[2]) && |
258 | isodigit(in[3])) { |
259 | *out++ = ((in[1] - '0')<<6) | |
260 | ((in[2] - '0')<<3) | |
261 | (in[3] - '0'); |
262 | in += 4; |
263 | continue; |
264 | } |
265 | } |
266 | *out++ = *in++; |
267 | } |
268 | *out = '\0'; |
269 | |
270 | return str; |
271 | } |
272 | |
273 | /* |
274 | * Parse words[] as a ddebug query specification, which is a series |
275 | * of (keyword, value) pairs chosen from these possibilities: |
276 | * |
277 | * func <function-name> |
278 | * file <full-pathname> |
279 | * file <base-filename> |
280 | * module <module-name> |
281 | * format <escaped-string-to-find-in-format> |
282 | * line <lineno> |
283 | * line <first-lineno>-<last-lineno> // where either may be empty |
284 | */ |
285 | static int ddebug_parse_query(char *words[], int nwords, |
286 | struct ddebug_query *query) |
287 | { |
288 | unsigned int i; |
289 | |
290 | /* check we have an even number of words */ |
291 | if (nwords % 2 != 0) |
292 | return -EINVAL; |
293 | memset(query, 0, sizeof(*query)); |
294 | |
295 | for (i = 0 ; i < nwords ; i += 2) { |
296 | if (!strcmp(words[i], "func")) |
297 | query->function = words[i+1]; |
298 | else if (!strcmp(words[i], "file")) |
299 | query->filename = words[i+1]; |
300 | else if (!strcmp(words[i], "module")) |
301 | query->module = words[i+1]; |
302 | else if (!strcmp(words[i], "format")) |
303 | query->format = unescape(words[i+1]); |
304 | else if (!strcmp(words[i], "line")) { |
305 | char *first = words[i+1]; |
306 | char *last = strchr(first, '-'); |
307 | if (last) |
308 | *last++ = '\0'; |
309 | if (parse_lineno(first, &query->first_lineno) < 0) |
310 | return -EINVAL; |
311 | if (last != NULL) { |
312 | /* range <first>-<last> */ |
313 | if (parse_lineno(last, &query->last_lineno) < 0) |
314 | return -EINVAL; |
315 | } else { |
316 | query->last_lineno = query->first_lineno; |
317 | } |
318 | } else { |
319 | if (verbose) |
320 | printk(KERN_ERR "%s: unknown keyword \"%s\"\n", |
321 | __func__, words[i]); |
322 | return -EINVAL; |
323 | } |
324 | } |
325 | |
326 | if (verbose) |
327 | printk(KERN_INFO "%s: q->function=\"%s\" q->filename=\"%s\" " |
328 | "q->module=\"%s\" q->format=\"%s\" q->lineno=%u-%u\n", |
329 | __func__, query->function, query->filename, |
330 | query->module, query->format, query->first_lineno, |
331 | query->last_lineno); |
332 | |
333 | return 0; |
334 | } |
335 | |
336 | /* |
337 | * Parse `str' as a flags specification, format [-+=][p]+. |
338 | * Sets up *maskp and *flagsp to be used when changing the |
339 | * flags fields of matched _ddebug's. Returns 0 on success |
340 | * or <0 on error. |
341 | */ |
342 | static int ddebug_parse_flags(const char *str, unsigned int *flagsp, |
343 | unsigned int *maskp) |
344 | { |
345 | unsigned flags = 0; |
346 | int op = '='; |
347 | |
348 | switch (*str) { |
349 | case '+': |
350 | case '-': |
351 | case '=': |
352 | op = *str++; |
353 | break; |
354 | default: |
355 | return -EINVAL; |
356 | } |
357 | if (verbose) |
358 | printk(KERN_INFO "%s: op='%c'\n", __func__, op); |
359 | |
360 | for ( ; *str ; ++str) { |
361 | switch (*str) { |
362 | case 'p': |
363 | flags |= _DPRINTK_FLAGS_PRINT; |
364 | break; |
365 | default: |
366 | return -EINVAL; |
367 | } |
368 | } |
369 | if (flags == 0) |
370 | return -EINVAL; |
371 | if (verbose) |
372 | printk(KERN_INFO "%s: flags=0x%x\n", __func__, flags); |
373 | |
374 | /* calculate final *flagsp, *maskp according to mask and op */ |
375 | switch (op) { |
376 | case '=': |
377 | *maskp = 0; |
378 | *flagsp = flags; |
379 | break; |
380 | case '+': |
381 | *maskp = ~0U; |
382 | *flagsp = flags; |
383 | break; |
384 | case '-': |
385 | *maskp = ~flags; |
386 | *flagsp = 0; |
387 | break; |
388 | } |
389 | if (verbose) |
390 | printk(KERN_INFO "%s: *flagsp=0x%x *maskp=0x%x\n", |
391 | __func__, *flagsp, *maskp); |
392 | return 0; |
393 | } |
394 | |
395 | static int ddebug_exec_query(char *query_string) |
396 | { |
397 | unsigned int flags = 0, mask = 0; |
398 | struct ddebug_query query; |
399 | #define MAXWORDS 9 |
400 | int nwords; |
401 | char *words[MAXWORDS]; |
402 | |
403 | nwords = ddebug_tokenize(query_string, words, MAXWORDS); |
404 | if (nwords <= 0) |
405 | return -EINVAL; |
406 | if (ddebug_parse_query(words, nwords-1, &query)) |
407 | return -EINVAL; |
408 | if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) |
409 | return -EINVAL; |
410 | |
411 | /* actually go and implement the change */ |
412 | ddebug_change(&query, flags, mask); |
413 | return 0; |
414 | } |
415 | |
416 | static __initdata char ddebug_setup_string[1024]; |
417 | static __init int ddebug_setup_query(char *str) |
418 | { |
419 | if (strlen(str) >= 1024) { |
420 | pr_warning("ddebug boot param string too large\n"); |
421 | return 0; |
422 | } |
423 | strcpy(ddebug_setup_string, str); |
424 | return 1; |
425 | } |
426 | |
427 | __setup("ddebug_query=", ddebug_setup_query); |
428 | |
429 | /* |
430 | * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the |
431 | * command text from userspace, parses and executes it. |
432 | */ |
433 | static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, |
434 | size_t len, loff_t *offp) |
435 | { |
436 | char tmpbuf[256]; |
437 | int ret; |
438 | |
439 | if (len == 0) |
440 | return 0; |
441 | /* we don't check *offp -- multiple writes() are allowed */ |
442 | if (len > sizeof(tmpbuf)-1) |
443 | return -E2BIG; |
444 | if (copy_from_user(tmpbuf, ubuf, len)) |
445 | return -EFAULT; |
446 | tmpbuf[len] = '\0'; |
447 | if (verbose) |
448 | printk(KERN_INFO "%s: read %d bytes from userspace\n", |
449 | __func__, (int)len); |
450 | |
451 | ret = ddebug_exec_query(tmpbuf); |
452 | if (ret) |
453 | return ret; |
454 | |
455 | *offp += len; |
456 | return len; |
457 | } |
458 | |
459 | /* |
460 | * Set the iterator to point to the first _ddebug object |
461 | * and return a pointer to that first object. Returns |
462 | * NULL if there are no _ddebugs at all. |
463 | */ |
464 | static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter) |
465 | { |
466 | if (list_empty(&ddebug_tables)) { |
467 | iter->table = NULL; |
468 | iter->idx = 0; |
469 | return NULL; |
470 | } |
471 | iter->table = list_entry(ddebug_tables.next, |
472 | struct ddebug_table, link); |
473 | iter->idx = 0; |
474 | return &iter->table->ddebugs[iter->idx]; |
475 | } |
476 | |
477 | /* |
478 | * Advance the iterator to point to the next _ddebug |
479 | * object from the one the iterator currently points at, |
480 | * and returns a pointer to the new _ddebug. Returns |
481 | * NULL if the iterator has seen all the _ddebugs. |
482 | */ |
483 | static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter) |
484 | { |
485 | if (iter->table == NULL) |
486 | return NULL; |
487 | if (++iter->idx == iter->table->num_ddebugs) { |
488 | /* iterate to next table */ |
489 | iter->idx = 0; |
490 | if (list_is_last(&iter->table->link, &ddebug_tables)) { |
491 | iter->table = NULL; |
492 | return NULL; |
493 | } |
494 | iter->table = list_entry(iter->table->link.next, |
495 | struct ddebug_table, link); |
496 | } |
497 | return &iter->table->ddebugs[iter->idx]; |
498 | } |
499 | |
500 | /* |
501 | * Seq_ops start method. Called at the start of every |
502 | * read() call from userspace. Takes the ddebug_lock and |
503 | * seeks the seq_file's iterator to the given position. |
504 | */ |
505 | static void *ddebug_proc_start(struct seq_file *m, loff_t *pos) |
506 | { |
507 | struct ddebug_iter *iter = m->private; |
508 | struct _ddebug *dp; |
509 | int n = *pos; |
510 | |
511 | if (verbose) |
512 | printk(KERN_INFO "%s: called m=%p *pos=%lld\n", |
513 | __func__, m, (unsigned long long)*pos); |
514 | |
515 | mutex_lock(&ddebug_lock); |
516 | |
517 | if (!n) |
518 | return SEQ_START_TOKEN; |
519 | if (n < 0) |
520 | return NULL; |
521 | dp = ddebug_iter_first(iter); |
522 | while (dp != NULL && --n > 0) |
523 | dp = ddebug_iter_next(iter); |
524 | return dp; |
525 | } |
526 | |
527 | /* |
528 | * Seq_ops next method. Called several times within a read() |
529 | * call from userspace, with ddebug_lock held. Walks to the |
530 | * next _ddebug object with a special case for the header line. |
531 | */ |
532 | static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos) |
533 | { |
534 | struct ddebug_iter *iter = m->private; |
535 | struct _ddebug *dp; |
536 | |
537 | if (verbose) |
538 | printk(KERN_INFO "%s: called m=%p p=%p *pos=%lld\n", |
539 | __func__, m, p, (unsigned long long)*pos); |
540 | |
541 | if (p == SEQ_START_TOKEN) |
542 | dp = ddebug_iter_first(iter); |
543 | else |
544 | dp = ddebug_iter_next(iter); |
545 | ++*pos; |
546 | return dp; |
547 | } |
548 | |
549 | /* |
550 | * Seq_ops show method. Called several times within a read() |
551 | * call from userspace, with ddebug_lock held. Formats the |
552 | * current _ddebug as a single human-readable line, with a |
553 | * special case for the header line. |
554 | */ |
555 | static int ddebug_proc_show(struct seq_file *m, void *p) |
556 | { |
557 | struct ddebug_iter *iter = m->private; |
558 | struct _ddebug *dp = p; |
559 | char flagsbuf[8]; |
560 | |
561 | if (verbose) |
562 | printk(KERN_INFO "%s: called m=%p p=%p\n", |
563 | __func__, m, p); |
564 | |
565 | if (p == SEQ_START_TOKEN) { |
566 | seq_puts(m, |
567 | "# filename:lineno [module]function flags format\n"); |
568 | return 0; |
569 | } |
570 | |
571 | seq_printf(m, "%s:%u [%s]%s %s \"", |
572 | dp->filename, dp->lineno, |
573 | iter->table->mod_name, dp->function, |
574 | ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf))); |
575 | seq_escape(m, dp->format, "\t\r\n\""); |
576 | seq_puts(m, "\"\n"); |
577 | |
578 | return 0; |
579 | } |
580 | |
581 | /* |
582 | * Seq_ops stop method. Called at the end of each read() |
583 | * call from userspace. Drops ddebug_lock. |
584 | */ |
585 | static void ddebug_proc_stop(struct seq_file *m, void *p) |
586 | { |
587 | if (verbose) |
588 | printk(KERN_INFO "%s: called m=%p p=%p\n", |
589 | __func__, m, p); |
590 | mutex_unlock(&ddebug_lock); |
591 | } |
592 | |
593 | static const struct seq_operations ddebug_proc_seqops = { |
594 | .start = ddebug_proc_start, |
595 | .next = ddebug_proc_next, |
596 | .show = ddebug_proc_show, |
597 | .stop = ddebug_proc_stop |
598 | }; |
599 | |
600 | /* |
601 | * File_ops->open method for <debugfs>/dynamic_debug/control. Does the seq_file |
602 | * setup dance, and also creates an iterator to walk the _ddebugs. |
603 | * Note that we create a seq_file always, even for O_WRONLY files |
604 | * where it's not needed, as doing so simplifies the ->release method. |
605 | */ |
606 | static int ddebug_proc_open(struct inode *inode, struct file *file) |
607 | { |
608 | struct ddebug_iter *iter; |
609 | int err; |
610 | |
611 | if (verbose) |
612 | printk(KERN_INFO "%s: called\n", __func__); |
613 | |
614 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
615 | if (iter == NULL) |
616 | return -ENOMEM; |
617 | |
618 | err = seq_open(file, &ddebug_proc_seqops); |
619 | if (err) { |
620 | kfree(iter); |
621 | return err; |
622 | } |
623 | ((struct seq_file *) file->private_data)->private = iter; |
624 | return 0; |
625 | } |
626 | |
627 | static const struct file_operations ddebug_proc_fops = { |
628 | .owner = THIS_MODULE, |
629 | .open = ddebug_proc_open, |
630 | .read = seq_read, |
631 | .llseek = seq_lseek, |
632 | .release = seq_release_private, |
633 | .write = ddebug_proc_write |
634 | }; |
635 | |
636 | /* |
637 | * Allocate a new ddebug_table for the given module |
638 | * and add it to the global list. |
639 | */ |
640 | int ddebug_add_module(struct _ddebug *tab, unsigned int n, |
641 | const char *name) |
642 | { |
643 | struct ddebug_table *dt; |
644 | char *new_name; |
645 | |
646 | dt = kzalloc(sizeof(*dt), GFP_KERNEL); |
647 | if (dt == NULL) |
648 | return -ENOMEM; |
649 | new_name = kstrdup(name, GFP_KERNEL); |
650 | if (new_name == NULL) { |
651 | kfree(dt); |
652 | return -ENOMEM; |
653 | } |
654 | dt->mod_name = new_name; |
655 | dt->num_ddebugs = n; |
656 | dt->num_enabled = 0; |
657 | dt->ddebugs = tab; |
658 | |
659 | mutex_lock(&ddebug_lock); |
660 | list_add_tail(&dt->link, &ddebug_tables); |
661 | mutex_unlock(&ddebug_lock); |
662 | |
663 | if (verbose) |
664 | printk(KERN_INFO "%u debug prints in module %s\n", |
665 | n, dt->mod_name); |
666 | return 0; |
667 | } |
668 | EXPORT_SYMBOL_GPL(ddebug_add_module); |
669 | |
670 | static void ddebug_table_free(struct ddebug_table *dt) |
671 | { |
672 | list_del_init(&dt->link); |
673 | kfree(dt->mod_name); |
674 | kfree(dt); |
675 | } |
676 | |
677 | /* |
678 | * Called in response to a module being unloaded. Removes |
679 | * any ddebug_table's which point at the module. |
680 | */ |
681 | int ddebug_remove_module(const char *mod_name) |
682 | { |
683 | struct ddebug_table *dt, *nextdt; |
684 | int ret = -ENOENT; |
685 | |
686 | if (verbose) |
687 | printk(KERN_INFO "%s: removing module \"%s\"\n", |
688 | __func__, mod_name); |
689 | |
690 | mutex_lock(&ddebug_lock); |
691 | list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) { |
692 | if (!strcmp(dt->mod_name, mod_name)) { |
693 | ddebug_table_free(dt); |
694 | ret = 0; |
695 | } |
696 | } |
697 | mutex_unlock(&ddebug_lock); |
698 | return ret; |
699 | } |
700 | EXPORT_SYMBOL_GPL(ddebug_remove_module); |
701 | |
702 | static void ddebug_remove_all_tables(void) |
703 | { |
704 | mutex_lock(&ddebug_lock); |
705 | while (!list_empty(&ddebug_tables)) { |
706 | struct ddebug_table *dt = list_entry(ddebug_tables.next, |
707 | struct ddebug_table, |
708 | link); |
709 | ddebug_table_free(dt); |
710 | } |
711 | mutex_unlock(&ddebug_lock); |
712 | } |
713 | |
714 | static __initdata int ddebug_init_success; |
715 | |
716 | static int __init dynamic_debug_init_debugfs(void) |
717 | { |
718 | struct dentry *dir, *file; |
719 | |
720 | if (!ddebug_init_success) |
721 | return -ENODEV; |
722 | |
723 | dir = debugfs_create_dir("dynamic_debug", NULL); |
724 | if (!dir) |
725 | return -ENOMEM; |
726 | file = debugfs_create_file("control", 0644, dir, NULL, |
727 | &ddebug_proc_fops); |
728 | if (!file) { |
729 | debugfs_remove(dir); |
730 | return -ENOMEM; |
731 | } |
732 | return 0; |
733 | } |
734 | |
735 | static int __init dynamic_debug_init(void) |
736 | { |
737 | struct _ddebug *iter, *iter_start; |
738 | const char *modname = NULL; |
739 | int ret = 0; |
740 | int n = 0; |
741 | |
742 | if (__start___verbose != __stop___verbose) { |
743 | iter = __start___verbose; |
744 | modname = iter->modname; |
745 | iter_start = iter; |
746 | for (; iter < __stop___verbose; iter++) { |
747 | if (strcmp(modname, iter->modname)) { |
748 | ret = ddebug_add_module(iter_start, n, modname); |
749 | if (ret) |
750 | goto out_free; |
751 | n = 0; |
752 | modname = iter->modname; |
753 | iter_start = iter; |
754 | } |
755 | n++; |
756 | } |
757 | ret = ddebug_add_module(iter_start, n, modname); |
758 | } |
759 | |
760 | /* ddebug_query boot param got passed -> set it up */ |
761 | if (ddebug_setup_string[0] != '\0') { |
762 | ret = ddebug_exec_query(ddebug_setup_string); |
763 | if (ret) |
764 | pr_warning("Invalid ddebug boot param %s", |
765 | ddebug_setup_string); |
766 | else |
767 | pr_info("ddebug initialized with string %s", |
768 | ddebug_setup_string); |
769 | } |
770 | |
771 | out_free: |
772 | if (ret) |
773 | ddebug_remove_all_tables(); |
774 | else |
775 | ddebug_init_success = 1; |
776 | return 0; |
777 | } |
778 | /* Allow early initialization for boot messages via boot param */ |
779 | arch_initcall(dynamic_debug_init); |
780 | /* Debugfs setup must be done later */ |
781 | module_init(dynamic_debug_init_debugfs); |
782 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9