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Source at commit b386be689295730688885552666ea40b2e639b14 created 11 years 11 months ago. By Maarten ter Huurne, Revert "MIPS: JZ4740: reset: Initialize hibernate wakeup counters." | |
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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 | * Copyright (C) 2011 Bart Van Assche. All Rights Reserved. |
11 | */ |
12 | |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
14 | |
15 | #include <linux/kernel.h> |
16 | #include <linux/module.h> |
17 | #include <linux/moduleparam.h> |
18 | #include <linux/kallsyms.h> |
19 | #include <linux/types.h> |
20 | #include <linux/mutex.h> |
21 | #include <linux/proc_fs.h> |
22 | #include <linux/seq_file.h> |
23 | #include <linux/list.h> |
24 | #include <linux/sysctl.h> |
25 | #include <linux/ctype.h> |
26 | #include <linux/string.h> |
27 | #include <linux/uaccess.h> |
28 | #include <linux/dynamic_debug.h> |
29 | #include <linux/debugfs.h> |
30 | #include <linux/slab.h> |
31 | #include <linux/jump_label.h> |
32 | #include <linux/hardirq.h> |
33 | #include <linux/sched.h> |
34 | #include <linux/device.h> |
35 | #include <linux/netdevice.h> |
36 | |
37 | extern struct _ddebug __start___verbose[]; |
38 | extern struct _ddebug __stop___verbose[]; |
39 | |
40 | struct ddebug_table { |
41 | struct list_head link; |
42 | char *mod_name; |
43 | unsigned int num_ddebugs; |
44 | struct _ddebug *ddebugs; |
45 | }; |
46 | |
47 | struct ddebug_query { |
48 | const char *filename; |
49 | const char *module; |
50 | const char *function; |
51 | const char *format; |
52 | unsigned int first_lineno, last_lineno; |
53 | }; |
54 | |
55 | struct ddebug_iter { |
56 | struct ddebug_table *table; |
57 | unsigned int idx; |
58 | }; |
59 | |
60 | static DEFINE_MUTEX(ddebug_lock); |
61 | static LIST_HEAD(ddebug_tables); |
62 | static int verbose = 0; |
63 | |
64 | /* Return the last part of a pathname */ |
65 | static inline const char *basename(const char *path) |
66 | { |
67 | const char *tail = strrchr(path, '/'); |
68 | return tail ? tail+1 : path; |
69 | } |
70 | |
71 | static struct { unsigned flag:8; char opt_char; } opt_array[] = { |
72 | { _DPRINTK_FLAGS_PRINT, 'p' }, |
73 | { _DPRINTK_FLAGS_INCL_MODNAME, 'm' }, |
74 | { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' }, |
75 | { _DPRINTK_FLAGS_INCL_LINENO, 'l' }, |
76 | { _DPRINTK_FLAGS_INCL_TID, 't' }, |
77 | }; |
78 | |
79 | /* format a string into buf[] which describes the _ddebug's flags */ |
80 | static char *ddebug_describe_flags(struct _ddebug *dp, char *buf, |
81 | size_t maxlen) |
82 | { |
83 | char *p = buf; |
84 | int i; |
85 | |
86 | BUG_ON(maxlen < 4); |
87 | for (i = 0; i < ARRAY_SIZE(opt_array); ++i) |
88 | if (dp->flags & opt_array[i].flag) |
89 | *p++ = opt_array[i].opt_char; |
90 | if (p == buf) |
91 | *p++ = '-'; |
92 | *p = '\0'; |
93 | |
94 | return buf; |
95 | } |
96 | |
97 | /* |
98 | * Search the tables for _ddebug's which match the given |
99 | * `query' and apply the `flags' and `mask' to them. Tells |
100 | * the user which ddebug's were changed, or whether none |
101 | * were matched. |
102 | */ |
103 | static void ddebug_change(const struct ddebug_query *query, |
104 | unsigned int flags, unsigned int mask) |
105 | { |
106 | int i; |
107 | struct ddebug_table *dt; |
108 | unsigned int newflags; |
109 | unsigned int nfound = 0; |
110 | char flagbuf[8]; |
111 | |
112 | /* search for matching ddebugs */ |
113 | mutex_lock(&ddebug_lock); |
114 | list_for_each_entry(dt, &ddebug_tables, link) { |
115 | |
116 | /* match against the module name */ |
117 | if (query->module != NULL && |
118 | strcmp(query->module, dt->mod_name)) |
119 | continue; |
120 | |
121 | for (i = 0 ; i < dt->num_ddebugs ; i++) { |
122 | struct _ddebug *dp = &dt->ddebugs[i]; |
123 | |
124 | /* match against the source filename */ |
125 | if (query->filename != NULL && |
126 | strcmp(query->filename, dp->filename) && |
127 | strcmp(query->filename, basename(dp->filename))) |
128 | continue; |
129 | |
130 | /* match against the function */ |
131 | if (query->function != NULL && |
132 | strcmp(query->function, dp->function)) |
133 | continue; |
134 | |
135 | /* match against the format */ |
136 | if (query->format != NULL && |
137 | strstr(dp->format, query->format) == NULL) |
138 | continue; |
139 | |
140 | /* match against the line number range */ |
141 | if (query->first_lineno && |
142 | dp->lineno < query->first_lineno) |
143 | continue; |
144 | if (query->last_lineno && |
145 | dp->lineno > query->last_lineno) |
146 | continue; |
147 | |
148 | nfound++; |
149 | |
150 | newflags = (dp->flags & mask) | flags; |
151 | if (newflags == dp->flags) |
152 | continue; |
153 | dp->flags = newflags; |
154 | if (newflags) |
155 | dp->enabled = 1; |
156 | else |
157 | dp->enabled = 0; |
158 | if (verbose) |
159 | pr_info("changed %s:%d [%s]%s %s\n", |
160 | dp->filename, dp->lineno, |
161 | dt->mod_name, dp->function, |
162 | ddebug_describe_flags(dp, flagbuf, |
163 | sizeof(flagbuf))); |
164 | } |
165 | } |
166 | mutex_unlock(&ddebug_lock); |
167 | |
168 | if (!nfound && verbose) |
169 | pr_info("no matches for query\n"); |
170 | } |
171 | |
172 | /* |
173 | * Split the buffer `buf' into space-separated words. |
174 | * Handles simple " and ' quoting, i.e. without nested, |
175 | * embedded or escaped \". Return the number of words |
176 | * or <0 on error. |
177 | */ |
178 | static int ddebug_tokenize(char *buf, char *words[], int maxwords) |
179 | { |
180 | int nwords = 0; |
181 | |
182 | while (*buf) { |
183 | char *end; |
184 | |
185 | /* Skip leading whitespace */ |
186 | buf = skip_spaces(buf); |
187 | if (!*buf) |
188 | break; /* oh, it was trailing whitespace */ |
189 | |
190 | /* Run `end' over a word, either whitespace separated or quoted */ |
191 | if (*buf == '"' || *buf == '\'') { |
192 | int quote = *buf++; |
193 | for (end = buf ; *end && *end != quote ; end++) |
194 | ; |
195 | if (!*end) |
196 | return -EINVAL; /* unclosed quote */ |
197 | } else { |
198 | for (end = buf ; *end && !isspace(*end) ; end++) |
199 | ; |
200 | BUG_ON(end == buf); |
201 | } |
202 | /* Here `buf' is the start of the word, `end' is one past the end */ |
203 | |
204 | if (nwords == maxwords) |
205 | return -EINVAL; /* ran out of words[] before bytes */ |
206 | if (*end) |
207 | *end++ = '\0'; /* terminate the word */ |
208 | words[nwords++] = buf; |
209 | buf = end; |
210 | } |
211 | |
212 | if (verbose) { |
213 | int i; |
214 | pr_info("split into words:"); |
215 | for (i = 0 ; i < nwords ; i++) |
216 | pr_cont(" \"%s\"", words[i]); |
217 | pr_cont("\n"); |
218 | } |
219 | |
220 | return nwords; |
221 | } |
222 | |
223 | /* |
224 | * Parse a single line number. Note that the empty string "" |
225 | * is treated as a special case and converted to zero, which |
226 | * is later treated as a "don't care" value. |
227 | */ |
228 | static inline int parse_lineno(const char *str, unsigned int *val) |
229 | { |
230 | char *end = NULL; |
231 | BUG_ON(str == NULL); |
232 | if (*str == '\0') { |
233 | *val = 0; |
234 | return 0; |
235 | } |
236 | *val = simple_strtoul(str, &end, 10); |
237 | return end == NULL || end == str || *end != '\0' ? -EINVAL : 0; |
238 | } |
239 | |
240 | /* |
241 | * Undo octal escaping in a string, inplace. This is useful to |
242 | * allow the user to express a query which matches a format |
243 | * containing embedded spaces. |
244 | */ |
245 | #define isodigit(c) ((c) >= '0' && (c) <= '7') |
246 | static char *unescape(char *str) |
247 | { |
248 | char *in = str; |
249 | char *out = str; |
250 | |
251 | while (*in) { |
252 | if (*in == '\\') { |
253 | if (in[1] == '\\') { |
254 | *out++ = '\\'; |
255 | in += 2; |
256 | continue; |
257 | } else if (in[1] == 't') { |
258 | *out++ = '\t'; |
259 | in += 2; |
260 | continue; |
261 | } else if (in[1] == 'n') { |
262 | *out++ = '\n'; |
263 | in += 2; |
264 | continue; |
265 | } else if (isodigit(in[1]) && |
266 | isodigit(in[2]) && |
267 | isodigit(in[3])) { |
268 | *out++ = ((in[1] - '0')<<6) | |
269 | ((in[2] - '0')<<3) | |
270 | (in[3] - '0'); |
271 | in += 4; |
272 | continue; |
273 | } |
274 | } |
275 | *out++ = *in++; |
276 | } |
277 | *out = '\0'; |
278 | |
279 | return str; |
280 | } |
281 | |
282 | /* |
283 | * Parse words[] as a ddebug query specification, which is a series |
284 | * of (keyword, value) pairs chosen from these possibilities: |
285 | * |
286 | * func <function-name> |
287 | * file <full-pathname> |
288 | * file <base-filename> |
289 | * module <module-name> |
290 | * format <escaped-string-to-find-in-format> |
291 | * line <lineno> |
292 | * line <first-lineno>-<last-lineno> // where either may be empty |
293 | */ |
294 | static int ddebug_parse_query(char *words[], int nwords, |
295 | struct ddebug_query *query) |
296 | { |
297 | unsigned int i; |
298 | |
299 | /* check we have an even number of words */ |
300 | if (nwords % 2 != 0) |
301 | return -EINVAL; |
302 | memset(query, 0, sizeof(*query)); |
303 | |
304 | for (i = 0 ; i < nwords ; i += 2) { |
305 | if (!strcmp(words[i], "func")) |
306 | query->function = words[i+1]; |
307 | else if (!strcmp(words[i], "file")) |
308 | query->filename = words[i+1]; |
309 | else if (!strcmp(words[i], "module")) |
310 | query->module = words[i+1]; |
311 | else if (!strcmp(words[i], "format")) |
312 | query->format = unescape(words[i+1]); |
313 | else if (!strcmp(words[i], "line")) { |
314 | char *first = words[i+1]; |
315 | char *last = strchr(first, '-'); |
316 | if (last) |
317 | *last++ = '\0'; |
318 | if (parse_lineno(first, &query->first_lineno) < 0) |
319 | return -EINVAL; |
320 | if (last != NULL) { |
321 | /* range <first>-<last> */ |
322 | if (parse_lineno(last, &query->last_lineno) < 0) |
323 | return -EINVAL; |
324 | } else { |
325 | query->last_lineno = query->first_lineno; |
326 | } |
327 | } else { |
328 | if (verbose) |
329 | pr_err("unknown keyword \"%s\"\n", words[i]); |
330 | return -EINVAL; |
331 | } |
332 | } |
333 | |
334 | if (verbose) |
335 | pr_info("q->function=\"%s\" q->filename=\"%s\" " |
336 | "q->module=\"%s\" q->format=\"%s\" q->lineno=%u-%u\n", |
337 | query->function, query->filename, |
338 | query->module, query->format, query->first_lineno, |
339 | query->last_lineno); |
340 | |
341 | return 0; |
342 | } |
343 | |
344 | /* |
345 | * Parse `str' as a flags specification, format [-+=][p]+. |
346 | * Sets up *maskp and *flagsp to be used when changing the |
347 | * flags fields of matched _ddebug's. Returns 0 on success |
348 | * or <0 on error. |
349 | */ |
350 | static int ddebug_parse_flags(const char *str, unsigned int *flagsp, |
351 | unsigned int *maskp) |
352 | { |
353 | unsigned flags = 0; |
354 | int op = '=', i; |
355 | |
356 | switch (*str) { |
357 | case '+': |
358 | case '-': |
359 | case '=': |
360 | op = *str++; |
361 | break; |
362 | default: |
363 | return -EINVAL; |
364 | } |
365 | if (verbose) |
366 | pr_info("op='%c'\n", op); |
367 | |
368 | for ( ; *str ; ++str) { |
369 | for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) { |
370 | if (*str == opt_array[i].opt_char) { |
371 | flags |= opt_array[i].flag; |
372 | break; |
373 | } |
374 | } |
375 | if (i < 0) |
376 | return -EINVAL; |
377 | } |
378 | if (flags == 0) |
379 | return -EINVAL; |
380 | if (verbose) |
381 | pr_info("flags=0x%x\n", flags); |
382 | |
383 | /* calculate final *flagsp, *maskp according to mask and op */ |
384 | switch (op) { |
385 | case '=': |
386 | *maskp = 0; |
387 | *flagsp = flags; |
388 | break; |
389 | case '+': |
390 | *maskp = ~0U; |
391 | *flagsp = flags; |
392 | break; |
393 | case '-': |
394 | *maskp = ~flags; |
395 | *flagsp = 0; |
396 | break; |
397 | } |
398 | if (verbose) |
399 | pr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp); |
400 | return 0; |
401 | } |
402 | |
403 | static int ddebug_exec_query(char *query_string) |
404 | { |
405 | unsigned int flags = 0, mask = 0; |
406 | struct ddebug_query query; |
407 | #define MAXWORDS 9 |
408 | int nwords; |
409 | char *words[MAXWORDS]; |
410 | |
411 | nwords = ddebug_tokenize(query_string, words, MAXWORDS); |
412 | if (nwords <= 0) |
413 | return -EINVAL; |
414 | if (ddebug_parse_query(words, nwords-1, &query)) |
415 | return -EINVAL; |
416 | if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) |
417 | return -EINVAL; |
418 | |
419 | /* actually go and implement the change */ |
420 | ddebug_change(&query, flags, mask); |
421 | return 0; |
422 | } |
423 | |
424 | #define PREFIX_SIZE 64 |
425 | |
426 | static int remaining(int wrote) |
427 | { |
428 | if (PREFIX_SIZE - wrote > 0) |
429 | return PREFIX_SIZE - wrote; |
430 | return 0; |
431 | } |
432 | |
433 | static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf) |
434 | { |
435 | int pos_after_tid; |
436 | int pos = 0; |
437 | |
438 | pos += snprintf(buf + pos, remaining(pos), "%s", KERN_DEBUG); |
439 | if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
440 | if (in_interrupt()) |
441 | pos += snprintf(buf + pos, remaining(pos), "%s ", |
442 | "<intr>"); |
443 | else |
444 | pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
445 | task_pid_vnr(current)); |
446 | } |
447 | pos_after_tid = pos; |
448 | if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) |
449 | pos += snprintf(buf + pos, remaining(pos), "%s:", |
450 | desc->modname); |
451 | if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) |
452 | pos += snprintf(buf + pos, remaining(pos), "%s:", |
453 | desc->function); |
454 | if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
455 | pos += snprintf(buf + pos, remaining(pos), "%d:", desc->lineno); |
456 | if (pos - pos_after_tid) |
457 | pos += snprintf(buf + pos, remaining(pos), " "); |
458 | if (pos >= PREFIX_SIZE) |
459 | buf[PREFIX_SIZE - 1] = '\0'; |
460 | |
461 | return buf; |
462 | } |
463 | |
464 | int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
465 | { |
466 | va_list args; |
467 | int res; |
468 | struct va_format vaf; |
469 | char buf[PREFIX_SIZE]; |
470 | |
471 | BUG_ON(!descriptor); |
472 | BUG_ON(!fmt); |
473 | |
474 | va_start(args, fmt); |
475 | vaf.fmt = fmt; |
476 | vaf.va = &args; |
477 | res = printk("%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
478 | va_end(args); |
479 | |
480 | return res; |
481 | } |
482 | EXPORT_SYMBOL(__dynamic_pr_debug); |
483 | |
484 | int __dynamic_dev_dbg(struct _ddebug *descriptor, |
485 | const struct device *dev, const char *fmt, ...) |
486 | { |
487 | struct va_format vaf; |
488 | va_list args; |
489 | int res; |
490 | char buf[PREFIX_SIZE]; |
491 | |
492 | BUG_ON(!descriptor); |
493 | BUG_ON(!fmt); |
494 | |
495 | va_start(args, fmt); |
496 | vaf.fmt = fmt; |
497 | vaf.va = &args; |
498 | res = __dev_printk(dynamic_emit_prefix(descriptor, buf), dev, &vaf); |
499 | va_end(args); |
500 | |
501 | return res; |
502 | } |
503 | EXPORT_SYMBOL(__dynamic_dev_dbg); |
504 | |
505 | #ifdef CONFIG_NET |
506 | |
507 | int __dynamic_netdev_dbg(struct _ddebug *descriptor, |
508 | const struct net_device *dev, const char *fmt, ...) |
509 | { |
510 | struct va_format vaf; |
511 | va_list args; |
512 | int res; |
513 | char buf[PREFIX_SIZE]; |
514 | |
515 | BUG_ON(!descriptor); |
516 | BUG_ON(!fmt); |
517 | |
518 | va_start(args, fmt); |
519 | vaf.fmt = fmt; |
520 | vaf.va = &args; |
521 | res = __netdev_printk(dynamic_emit_prefix(descriptor, buf), dev, &vaf); |
522 | va_end(args); |
523 | |
524 | return res; |
525 | } |
526 | EXPORT_SYMBOL(__dynamic_netdev_dbg); |
527 | |
528 | #endif |
529 | |
530 | static __initdata char ddebug_setup_string[1024]; |
531 | static __init int ddebug_setup_query(char *str) |
532 | { |
533 | if (strlen(str) >= 1024) { |
534 | pr_warn("ddebug boot param string too large\n"); |
535 | return 0; |
536 | } |
537 | strcpy(ddebug_setup_string, str); |
538 | return 1; |
539 | } |
540 | |
541 | __setup("ddebug_query=", ddebug_setup_query); |
542 | |
543 | /* |
544 | * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the |
545 | * command text from userspace, parses and executes it. |
546 | */ |
547 | static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, |
548 | size_t len, loff_t *offp) |
549 | { |
550 | char tmpbuf[256]; |
551 | int ret; |
552 | |
553 | if (len == 0) |
554 | return 0; |
555 | /* we don't check *offp -- multiple writes() are allowed */ |
556 | if (len > sizeof(tmpbuf)-1) |
557 | return -E2BIG; |
558 | if (copy_from_user(tmpbuf, ubuf, len)) |
559 | return -EFAULT; |
560 | tmpbuf[len] = '\0'; |
561 | if (verbose) |
562 | pr_info("read %d bytes from userspace\n", (int)len); |
563 | |
564 | ret = ddebug_exec_query(tmpbuf); |
565 | if (ret) |
566 | return ret; |
567 | |
568 | *offp += len; |
569 | return len; |
570 | } |
571 | |
572 | /* |
573 | * Set the iterator to point to the first _ddebug object |
574 | * and return a pointer to that first object. Returns |
575 | * NULL if there are no _ddebugs at all. |
576 | */ |
577 | static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter) |
578 | { |
579 | if (list_empty(&ddebug_tables)) { |
580 | iter->table = NULL; |
581 | iter->idx = 0; |
582 | return NULL; |
583 | } |
584 | iter->table = list_entry(ddebug_tables.next, |
585 | struct ddebug_table, link); |
586 | iter->idx = 0; |
587 | return &iter->table->ddebugs[iter->idx]; |
588 | } |
589 | |
590 | /* |
591 | * Advance the iterator to point to the next _ddebug |
592 | * object from the one the iterator currently points at, |
593 | * and returns a pointer to the new _ddebug. Returns |
594 | * NULL if the iterator has seen all the _ddebugs. |
595 | */ |
596 | static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter) |
597 | { |
598 | if (iter->table == NULL) |
599 | return NULL; |
600 | if (++iter->idx == iter->table->num_ddebugs) { |
601 | /* iterate to next table */ |
602 | iter->idx = 0; |
603 | if (list_is_last(&iter->table->link, &ddebug_tables)) { |
604 | iter->table = NULL; |
605 | return NULL; |
606 | } |
607 | iter->table = list_entry(iter->table->link.next, |
608 | struct ddebug_table, link); |
609 | } |
610 | return &iter->table->ddebugs[iter->idx]; |
611 | } |
612 | |
613 | /* |
614 | * Seq_ops start method. Called at the start of every |
615 | * read() call from userspace. Takes the ddebug_lock and |
616 | * seeks the seq_file's iterator to the given position. |
617 | */ |
618 | static void *ddebug_proc_start(struct seq_file *m, loff_t *pos) |
619 | { |
620 | struct ddebug_iter *iter = m->private; |
621 | struct _ddebug *dp; |
622 | int n = *pos; |
623 | |
624 | if (verbose) |
625 | pr_info("called m=%p *pos=%lld\n", m, (unsigned long long)*pos); |
626 | |
627 | mutex_lock(&ddebug_lock); |
628 | |
629 | if (!n) |
630 | return SEQ_START_TOKEN; |
631 | if (n < 0) |
632 | return NULL; |
633 | dp = ddebug_iter_first(iter); |
634 | while (dp != NULL && --n > 0) |
635 | dp = ddebug_iter_next(iter); |
636 | return dp; |
637 | } |
638 | |
639 | /* |
640 | * Seq_ops next method. Called several times within a read() |
641 | * call from userspace, with ddebug_lock held. Walks to the |
642 | * next _ddebug object with a special case for the header line. |
643 | */ |
644 | static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos) |
645 | { |
646 | struct ddebug_iter *iter = m->private; |
647 | struct _ddebug *dp; |
648 | |
649 | if (verbose) |
650 | pr_info("called m=%p p=%p *pos=%lld\n", |
651 | m, p, (unsigned long long)*pos); |
652 | |
653 | if (p == SEQ_START_TOKEN) |
654 | dp = ddebug_iter_first(iter); |
655 | else |
656 | dp = ddebug_iter_next(iter); |
657 | ++*pos; |
658 | return dp; |
659 | } |
660 | |
661 | /* |
662 | * Seq_ops show method. Called several times within a read() |
663 | * call from userspace, with ddebug_lock held. Formats the |
664 | * current _ddebug as a single human-readable line, with a |
665 | * special case for the header line. |
666 | */ |
667 | static int ddebug_proc_show(struct seq_file *m, void *p) |
668 | { |
669 | struct ddebug_iter *iter = m->private; |
670 | struct _ddebug *dp = p; |
671 | char flagsbuf[8]; |
672 | |
673 | if (verbose) |
674 | pr_info("called m=%p p=%p\n", m, p); |
675 | |
676 | if (p == SEQ_START_TOKEN) { |
677 | seq_puts(m, |
678 | "# filename:lineno [module]function flags format\n"); |
679 | return 0; |
680 | } |
681 | |
682 | seq_printf(m, "%s:%u [%s]%s %s \"", |
683 | dp->filename, dp->lineno, |
684 | iter->table->mod_name, dp->function, |
685 | ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf))); |
686 | seq_escape(m, dp->format, "\t\r\n\""); |
687 | seq_puts(m, "\"\n"); |
688 | |
689 | return 0; |
690 | } |
691 | |
692 | /* |
693 | * Seq_ops stop method. Called at the end of each read() |
694 | * call from userspace. Drops ddebug_lock. |
695 | */ |
696 | static void ddebug_proc_stop(struct seq_file *m, void *p) |
697 | { |
698 | if (verbose) |
699 | pr_info("called m=%p p=%p\n", m, p); |
700 | mutex_unlock(&ddebug_lock); |
701 | } |
702 | |
703 | static const struct seq_operations ddebug_proc_seqops = { |
704 | .start = ddebug_proc_start, |
705 | .next = ddebug_proc_next, |
706 | .show = ddebug_proc_show, |
707 | .stop = ddebug_proc_stop |
708 | }; |
709 | |
710 | /* |
711 | * File_ops->open method for <debugfs>/dynamic_debug/control. Does the seq_file |
712 | * setup dance, and also creates an iterator to walk the _ddebugs. |
713 | * Note that we create a seq_file always, even for O_WRONLY files |
714 | * where it's not needed, as doing so simplifies the ->release method. |
715 | */ |
716 | static int ddebug_proc_open(struct inode *inode, struct file *file) |
717 | { |
718 | struct ddebug_iter *iter; |
719 | int err; |
720 | |
721 | if (verbose) |
722 | pr_info("called\n"); |
723 | |
724 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
725 | if (iter == NULL) |
726 | return -ENOMEM; |
727 | |
728 | err = seq_open(file, &ddebug_proc_seqops); |
729 | if (err) { |
730 | kfree(iter); |
731 | return err; |
732 | } |
733 | ((struct seq_file *) file->private_data)->private = iter; |
734 | return 0; |
735 | } |
736 | |
737 | static const struct file_operations ddebug_proc_fops = { |
738 | .owner = THIS_MODULE, |
739 | .open = ddebug_proc_open, |
740 | .read = seq_read, |
741 | .llseek = seq_lseek, |
742 | .release = seq_release_private, |
743 | .write = ddebug_proc_write |
744 | }; |
745 | |
746 | /* |
747 | * Allocate a new ddebug_table for the given module |
748 | * and add it to the global list. |
749 | */ |
750 | int ddebug_add_module(struct _ddebug *tab, unsigned int n, |
751 | const char *name) |
752 | { |
753 | struct ddebug_table *dt; |
754 | char *new_name; |
755 | |
756 | dt = kzalloc(sizeof(*dt), GFP_KERNEL); |
757 | if (dt == NULL) |
758 | return -ENOMEM; |
759 | new_name = kstrdup(name, GFP_KERNEL); |
760 | if (new_name == NULL) { |
761 | kfree(dt); |
762 | return -ENOMEM; |
763 | } |
764 | dt->mod_name = new_name; |
765 | dt->num_ddebugs = n; |
766 | dt->ddebugs = tab; |
767 | |
768 | mutex_lock(&ddebug_lock); |
769 | list_add_tail(&dt->link, &ddebug_tables); |
770 | mutex_unlock(&ddebug_lock); |
771 | |
772 | if (verbose) |
773 | pr_info("%u debug prints in module %s\n", n, dt->mod_name); |
774 | return 0; |
775 | } |
776 | EXPORT_SYMBOL_GPL(ddebug_add_module); |
777 | |
778 | static void ddebug_table_free(struct ddebug_table *dt) |
779 | { |
780 | list_del_init(&dt->link); |
781 | kfree(dt->mod_name); |
782 | kfree(dt); |
783 | } |
784 | |
785 | /* |
786 | * Called in response to a module being unloaded. Removes |
787 | * any ddebug_table's which point at the module. |
788 | */ |
789 | int ddebug_remove_module(const char *mod_name) |
790 | { |
791 | struct ddebug_table *dt, *nextdt; |
792 | int ret = -ENOENT; |
793 | |
794 | if (verbose) |
795 | pr_info("removing module \"%s\"\n", mod_name); |
796 | |
797 | mutex_lock(&ddebug_lock); |
798 | list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) { |
799 | if (!strcmp(dt->mod_name, mod_name)) { |
800 | ddebug_table_free(dt); |
801 | ret = 0; |
802 | } |
803 | } |
804 | mutex_unlock(&ddebug_lock); |
805 | return ret; |
806 | } |
807 | EXPORT_SYMBOL_GPL(ddebug_remove_module); |
808 | |
809 | static void ddebug_remove_all_tables(void) |
810 | { |
811 | mutex_lock(&ddebug_lock); |
812 | while (!list_empty(&ddebug_tables)) { |
813 | struct ddebug_table *dt = list_entry(ddebug_tables.next, |
814 | struct ddebug_table, |
815 | link); |
816 | ddebug_table_free(dt); |
817 | } |
818 | mutex_unlock(&ddebug_lock); |
819 | } |
820 | |
821 | static __initdata int ddebug_init_success; |
822 | |
823 | static int __init dynamic_debug_init_debugfs(void) |
824 | { |
825 | struct dentry *dir, *file; |
826 | |
827 | if (!ddebug_init_success) |
828 | return -ENODEV; |
829 | |
830 | dir = debugfs_create_dir("dynamic_debug", NULL); |
831 | if (!dir) |
832 | return -ENOMEM; |
833 | file = debugfs_create_file("control", 0644, dir, NULL, |
834 | &ddebug_proc_fops); |
835 | if (!file) { |
836 | debugfs_remove(dir); |
837 | return -ENOMEM; |
838 | } |
839 | return 0; |
840 | } |
841 | |
842 | static int __init dynamic_debug_init(void) |
843 | { |
844 | struct _ddebug *iter, *iter_start; |
845 | const char *modname = NULL; |
846 | int ret = 0; |
847 | int n = 0; |
848 | |
849 | if (__start___verbose != __stop___verbose) { |
850 | iter = __start___verbose; |
851 | modname = iter->modname; |
852 | iter_start = iter; |
853 | for (; iter < __stop___verbose; iter++) { |
854 | if (strcmp(modname, iter->modname)) { |
855 | ret = ddebug_add_module(iter_start, n, modname); |
856 | if (ret) |
857 | goto out_free; |
858 | n = 0; |
859 | modname = iter->modname; |
860 | iter_start = iter; |
861 | } |
862 | n++; |
863 | } |
864 | ret = ddebug_add_module(iter_start, n, modname); |
865 | } |
866 | |
867 | /* ddebug_query boot param got passed -> set it up */ |
868 | if (ddebug_setup_string[0] != '\0') { |
869 | ret = ddebug_exec_query(ddebug_setup_string); |
870 | if (ret) |
871 | pr_warn("Invalid ddebug boot param %s", |
872 | ddebug_setup_string); |
873 | else |
874 | pr_info("ddebug initialized with string %s", |
875 | ddebug_setup_string); |
876 | } |
877 | |
878 | out_free: |
879 | if (ret) |
880 | ddebug_remove_all_tables(); |
881 | else |
882 | ddebug_init_success = 1; |
883 | return 0; |
884 | } |
885 | /* Allow early initialization for boot messages via boot param */ |
886 | arch_initcall(dynamic_debug_init); |
887 | /* Debugfs setup must be done later */ |
888 | module_init(dynamic_debug_init_debugfs); |
889 |
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