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Commit | Line | Data |
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e9d376f0 JB |
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. | |
8ba6ebf5 | 10 | * Copyright (C) 2011 Bart Van Assche. All Rights Reserved. |
578b1e07 | 11 | * Copyright (C) 2013 Du, Changbin <changbin.du@gmail.com> |
e9d376f0 JB |
12 | */ |
13 | ||
4ad275e5 JP |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
15 | ||
e9d376f0 JB |
16 | #include <linux/kernel.h> |
17 | #include <linux/module.h> | |
fef15d2f GKH |
18 | #include <linux/moduleparam.h> |
19 | #include <linux/kallsyms.h> | |
20 | #include <linux/types.h> | |
e9d376f0 | 21 | #include <linux/mutex.h> |
fef15d2f | 22 | #include <linux/proc_fs.h> |
e9d376f0 | 23 | #include <linux/seq_file.h> |
fef15d2f GKH |
24 | #include <linux/list.h> |
25 | #include <linux/sysctl.h> | |
e9d376f0 | 26 | #include <linux/ctype.h> |
fef15d2f | 27 | #include <linux/string.h> |
578b1e07 | 28 | #include <linux/parser.h> |
d338b137 | 29 | #include <linux/string_helpers.h> |
fef15d2f | 30 | #include <linux/uaccess.h> |
e9d376f0 JB |
31 | #include <linux/dynamic_debug.h> |
32 | #include <linux/debugfs.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
fef15d2f | 34 | #include <linux/jump_label.h> |
8ba6ebf5 | 35 | #include <linux/hardirq.h> |
e8d9792a | 36 | #include <linux/sched.h> |
fef15d2f | 37 | #include <linux/device.h> |
ffa10cb4 | 38 | #include <linux/netdevice.h> |
e9d376f0 JB |
39 | |
40 | extern struct _ddebug __start___verbose[]; | |
41 | extern struct _ddebug __stop___verbose[]; | |
42 | ||
e9d376f0 JB |
43 | struct ddebug_table { |
44 | struct list_head link; | |
3e406b1d | 45 | const char *mod_name; |
e9d376f0 | 46 | unsigned int num_ddebugs; |
e9d376f0 JB |
47 | struct _ddebug *ddebugs; |
48 | }; | |
49 | ||
50 | struct ddebug_query { | |
51 | const char *filename; | |
52 | const char *module; | |
53 | const char *function; | |
54 | const char *format; | |
55 | unsigned int first_lineno, last_lineno; | |
56 | }; | |
57 | ||
58 | struct ddebug_iter { | |
59 | struct ddebug_table *table; | |
60 | unsigned int idx; | |
61 | }; | |
62 | ||
63 | static DEFINE_MUTEX(ddebug_lock); | |
64 | static LIST_HEAD(ddebug_tables); | |
f657fd21 | 65 | static int verbose; |
74df138d | 66 | module_param(verbose, int, 0644); |
e9d376f0 | 67 | |
2b678319 JC |
68 | /* Return the path relative to source root */ |
69 | static inline const char *trim_prefix(const char *path) | |
70 | { | |
71 | int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c"); | |
72 | ||
73 | if (strncmp(path, __FILE__, skip)) | |
74 | skip = 0; /* prefix mismatch, don't skip */ | |
75 | ||
76 | return path + skip; | |
77 | } | |
78 | ||
8ba6ebf5 BVA |
79 | static struct { unsigned flag:8; char opt_char; } opt_array[] = { |
80 | { _DPRINTK_FLAGS_PRINT, 'p' }, | |
81 | { _DPRINTK_FLAGS_INCL_MODNAME, 'm' }, | |
82 | { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' }, | |
83 | { _DPRINTK_FLAGS_INCL_LINENO, 'l' }, | |
84 | { _DPRINTK_FLAGS_INCL_TID, 't' }, | |
5ca7d2a6 | 85 | { _DPRINTK_FLAGS_NONE, '_' }, |
8ba6ebf5 BVA |
86 | }; |
87 | ||
e9d376f0 JB |
88 | /* format a string into buf[] which describes the _ddebug's flags */ |
89 | static char *ddebug_describe_flags(struct _ddebug *dp, char *buf, | |
90 | size_t maxlen) | |
91 | { | |
92 | char *p = buf; | |
8ba6ebf5 | 93 | int i; |
e9d376f0 | 94 | |
5ca7d2a6 | 95 | BUG_ON(maxlen < 6); |
8ba6ebf5 BVA |
96 | for (i = 0; i < ARRAY_SIZE(opt_array); ++i) |
97 | if (dp->flags & opt_array[i].flag) | |
98 | *p++ = opt_array[i].opt_char; | |
e9d376f0 | 99 | if (p == buf) |
5ca7d2a6 | 100 | *p++ = '_'; |
e9d376f0 JB |
101 | *p = '\0'; |
102 | ||
103 | return buf; | |
104 | } | |
105 | ||
f657fd21 | 106 | #define vpr_info(fmt, ...) \ |
b8ccd5de | 107 | do { \ |
f657fd21 JP |
108 | if (verbose) \ |
109 | pr_info(fmt, ##__VA_ARGS__); \ | |
574b3725 JC |
110 | } while (0) |
111 | ||
f657fd21 JP |
112 | static void vpr_info_dq(const struct ddebug_query *query, const char *msg) |
113 | { | |
114 | /* trim any trailing newlines */ | |
115 | int fmtlen = 0; | |
116 | ||
117 | if (query->format) { | |
118 | fmtlen = strlen(query->format); | |
119 | while (fmtlen && query->format[fmtlen - 1] == '\n') | |
120 | fmtlen--; | |
121 | } | |
122 | ||
123 | vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n", | |
124 | msg, | |
125 | query->function ? query->function : "", | |
126 | query->filename ? query->filename : "", | |
127 | query->module ? query->module : "", | |
128 | fmtlen, query->format ? query->format : "", | |
129 | query->first_lineno, query->last_lineno); | |
130 | } | |
131 | ||
e9d376f0 | 132 | /* |
85f7f6c0 JC |
133 | * Search the tables for _ddebug's which match the given `query' and |
134 | * apply the `flags' and `mask' to them. Returns number of matching | |
135 | * callsites, normally the same as number of changes. If verbose, | |
136 | * logs the changes. Takes ddebug_lock. | |
e9d376f0 | 137 | */ |
85f7f6c0 JC |
138 | static int ddebug_change(const struct ddebug_query *query, |
139 | unsigned int flags, unsigned int mask) | |
e9d376f0 JB |
140 | { |
141 | int i; | |
142 | struct ddebug_table *dt; | |
143 | unsigned int newflags; | |
144 | unsigned int nfound = 0; | |
5ca7d2a6 | 145 | char flagbuf[10]; |
e9d376f0 JB |
146 | |
147 | /* search for matching ddebugs */ | |
148 | mutex_lock(&ddebug_lock); | |
149 | list_for_each_entry(dt, &ddebug_tables, link) { | |
150 | ||
151 | /* match against the module name */ | |
578b1e07 DC |
152 | if (query->module && |
153 | !match_wildcard(query->module, dt->mod_name)) | |
e9d376f0 JB |
154 | continue; |
155 | ||
f657fd21 | 156 | for (i = 0; i < dt->num_ddebugs; i++) { |
e9d376f0 JB |
157 | struct _ddebug *dp = &dt->ddebugs[i]; |
158 | ||
159 | /* match against the source filename */ | |
d6a238d2 | 160 | if (query->filename && |
578b1e07 DC |
161 | !match_wildcard(query->filename, dp->filename) && |
162 | !match_wildcard(query->filename, | |
163 | kbasename(dp->filename)) && | |
164 | !match_wildcard(query->filename, | |
165 | trim_prefix(dp->filename))) | |
e9d376f0 JB |
166 | continue; |
167 | ||
168 | /* match against the function */ | |
d6a238d2 | 169 | if (query->function && |
578b1e07 | 170 | !match_wildcard(query->function, dp->function)) |
e9d376f0 JB |
171 | continue; |
172 | ||
173 | /* match against the format */ | |
d6a238d2 JC |
174 | if (query->format && |
175 | !strstr(dp->format, query->format)) | |
e9d376f0 JB |
176 | continue; |
177 | ||
178 | /* match against the line number range */ | |
179 | if (query->first_lineno && | |
180 | dp->lineno < query->first_lineno) | |
181 | continue; | |
182 | if (query->last_lineno && | |
183 | dp->lineno > query->last_lineno) | |
184 | continue; | |
185 | ||
186 | nfound++; | |
187 | ||
188 | newflags = (dp->flags & mask) | flags; | |
189 | if (newflags == dp->flags) | |
190 | continue; | |
e9d376f0 | 191 | dp->flags = newflags; |
b8ccd5de | 192 | vpr_info("changed %s:%d [%s]%s =%s\n", |
f657fd21 JP |
193 | trim_prefix(dp->filename), dp->lineno, |
194 | dt->mod_name, dp->function, | |
195 | ddebug_describe_flags(dp, flagbuf, | |
196 | sizeof(flagbuf))); | |
e9d376f0 JB |
197 | } |
198 | } | |
199 | mutex_unlock(&ddebug_lock); | |
200 | ||
201 | if (!nfound && verbose) | |
4ad275e5 | 202 | pr_info("no matches for query\n"); |
85f7f6c0 JC |
203 | |
204 | return nfound; | |
e9d376f0 JB |
205 | } |
206 | ||
e9d376f0 JB |
207 | /* |
208 | * Split the buffer `buf' into space-separated words. | |
9898abb3 GB |
209 | * Handles simple " and ' quoting, i.e. without nested, |
210 | * embedded or escaped \". Return the number of words | |
211 | * or <0 on error. | |
e9d376f0 JB |
212 | */ |
213 | static int ddebug_tokenize(char *buf, char *words[], int maxwords) | |
214 | { | |
215 | int nwords = 0; | |
216 | ||
9898abb3 GB |
217 | while (*buf) { |
218 | char *end; | |
219 | ||
220 | /* Skip leading whitespace */ | |
e7d2860b | 221 | buf = skip_spaces(buf); |
9898abb3 GB |
222 | if (!*buf) |
223 | break; /* oh, it was trailing whitespace */ | |
8bd6026e JC |
224 | if (*buf == '#') |
225 | break; /* token starts comment, skip rest of line */ | |
9898abb3 | 226 | |
07100be7 | 227 | /* find `end' of word, whitespace separated or quoted */ |
9898abb3 GB |
228 | if (*buf == '"' || *buf == '\'') { |
229 | int quote = *buf++; | |
f657fd21 | 230 | for (end = buf; *end && *end != quote; end++) |
9898abb3 | 231 | ; |
18c216c5 JC |
232 | if (!*end) { |
233 | pr_err("unclosed quote: %s\n", buf); | |
9898abb3 | 234 | return -EINVAL; /* unclosed quote */ |
18c216c5 | 235 | } |
9898abb3 | 236 | } else { |
f657fd21 | 237 | for (end = buf; *end && !isspace(*end); end++) |
9898abb3 GB |
238 | ; |
239 | BUG_ON(end == buf); | |
240 | } | |
9898abb3 | 241 | |
07100be7 | 242 | /* `buf' is start of word, `end' is one past its end */ |
18c216c5 JC |
243 | if (nwords == maxwords) { |
244 | pr_err("too many words, legal max <=%d\n", maxwords); | |
9898abb3 | 245 | return -EINVAL; /* ran out of words[] before bytes */ |
18c216c5 | 246 | } |
9898abb3 GB |
247 | if (*end) |
248 | *end++ = '\0'; /* terminate the word */ | |
249 | words[nwords++] = buf; | |
250 | buf = end; | |
251 | } | |
e9d376f0 JB |
252 | |
253 | if (verbose) { | |
254 | int i; | |
4ad275e5 | 255 | pr_info("split into words:"); |
f657fd21 | 256 | for (i = 0; i < nwords; i++) |
4ad275e5 JP |
257 | pr_cont(" \"%s\"", words[i]); |
258 | pr_cont("\n"); | |
e9d376f0 JB |
259 | } |
260 | ||
261 | return nwords; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Parse a single line number. Note that the empty string "" | |
266 | * is treated as a special case and converted to zero, which | |
267 | * is later treated as a "don't care" value. | |
268 | */ | |
269 | static inline int parse_lineno(const char *str, unsigned int *val) | |
270 | { | |
e9d376f0 JB |
271 | BUG_ON(str == NULL); |
272 | if (*str == '\0') { | |
273 | *val = 0; | |
274 | return 0; | |
275 | } | |
4592599a | 276 | if (kstrtouint(str, 10, val) < 0) { |
18c216c5 JC |
277 | pr_err("bad line-number: %s\n", str); |
278 | return -EINVAL; | |
279 | } | |
280 | return 0; | |
e9d376f0 JB |
281 | } |
282 | ||
820874c7 JC |
283 | static int check_set(const char **dest, char *src, char *name) |
284 | { | |
285 | int rc = 0; | |
286 | ||
287 | if (*dest) { | |
288 | rc = -EINVAL; | |
f657fd21 JP |
289 | pr_err("match-spec:%s val:%s overridden by %s\n", |
290 | name, *dest, src); | |
820874c7 JC |
291 | } |
292 | *dest = src; | |
293 | return rc; | |
294 | } | |
295 | ||
e9d376f0 JB |
296 | /* |
297 | * Parse words[] as a ddebug query specification, which is a series | |
298 | * of (keyword, value) pairs chosen from these possibilities: | |
299 | * | |
300 | * func <function-name> | |
301 | * file <full-pathname> | |
302 | * file <base-filename> | |
303 | * module <module-name> | |
304 | * format <escaped-string-to-find-in-format> | |
305 | * line <lineno> | |
306 | * line <first-lineno>-<last-lineno> // where either may be empty | |
820874c7 JC |
307 | * |
308 | * Only 1 of each type is allowed. | |
309 | * Returns 0 on success, <0 on error. | |
e9d376f0 JB |
310 | */ |
311 | static int ddebug_parse_query(char *words[], int nwords, | |
8e59b5cf | 312 | struct ddebug_query *query, const char *modname) |
e9d376f0 JB |
313 | { |
314 | unsigned int i; | |
bd8c154a | 315 | int rc = 0; |
e9d376f0 JB |
316 | |
317 | /* check we have an even number of words */ | |
18c216c5 JC |
318 | if (nwords % 2 != 0) { |
319 | pr_err("expecting pairs of match-spec <value>\n"); | |
e9d376f0 | 320 | return -EINVAL; |
18c216c5 | 321 | } |
e9d376f0 JB |
322 | memset(query, 0, sizeof(*query)); |
323 | ||
8e59b5cf JC |
324 | if (modname) |
325 | /* support $modname.dyndbg=<multiple queries> */ | |
326 | query->module = modname; | |
327 | ||
f657fd21 JP |
328 | for (i = 0; i < nwords; i += 2) { |
329 | if (!strcmp(words[i], "func")) { | |
820874c7 | 330 | rc = check_set(&query->function, words[i+1], "func"); |
f657fd21 | 331 | } else if (!strcmp(words[i], "file")) { |
820874c7 | 332 | rc = check_set(&query->filename, words[i+1], "file"); |
f657fd21 | 333 | } else if (!strcmp(words[i], "module")) { |
820874c7 | 334 | rc = check_set(&query->module, words[i+1], "module"); |
f657fd21 | 335 | } else if (!strcmp(words[i], "format")) { |
d338b137 AS |
336 | string_unescape_inplace(words[i+1], UNESCAPE_SPACE | |
337 | UNESCAPE_OCTAL | | |
338 | UNESCAPE_SPECIAL); | |
339 | rc = check_set(&query->format, words[i+1], "format"); | |
f657fd21 | 340 | } else if (!strcmp(words[i], "line")) { |
e9d376f0 JB |
341 | char *first = words[i+1]; |
342 | char *last = strchr(first, '-'); | |
820874c7 | 343 | if (query->first_lineno || query->last_lineno) { |
18c216c5 | 344 | pr_err("match-spec: line used 2x\n"); |
820874c7 JC |
345 | return -EINVAL; |
346 | } | |
e9d376f0 JB |
347 | if (last) |
348 | *last++ = '\0'; | |
d9e133e6 | 349 | if (parse_lineno(first, &query->first_lineno) < 0) |
e9d376f0 | 350 | return -EINVAL; |
820874c7 | 351 | if (last) { |
e9d376f0 | 352 | /* range <first>-<last> */ |
3ace678f AR |
353 | if (parse_lineno(last, &query->last_lineno) < 0) |
354 | return -EINVAL; | |
355 | ||
cf9a7501 RD |
356 | /* special case for last lineno not specified */ |
357 | if (query->last_lineno == 0) | |
358 | query->last_lineno = UINT_MAX; | |
359 | ||
3ace678f | 360 | if (query->last_lineno < query->first_lineno) { |
18c216c5 JC |
361 | pr_err("last-line:%d < 1st-line:%d\n", |
362 | query->last_lineno, | |
363 | query->first_lineno); | |
e9d376f0 | 364 | return -EINVAL; |
820874c7 | 365 | } |
e9d376f0 JB |
366 | } else { |
367 | query->last_lineno = query->first_lineno; | |
368 | } | |
369 | } else { | |
ae27f86a | 370 | pr_err("unknown keyword \"%s\"\n", words[i]); |
e9d376f0 JB |
371 | return -EINVAL; |
372 | } | |
820874c7 JC |
373 | if (rc) |
374 | return rc; | |
e9d376f0 | 375 | } |
574b3725 | 376 | vpr_info_dq(query, "parsed"); |
e9d376f0 JB |
377 | return 0; |
378 | } | |
379 | ||
380 | /* | |
381 | * Parse `str' as a flags specification, format [-+=][p]+. | |
382 | * Sets up *maskp and *flagsp to be used when changing the | |
383 | * flags fields of matched _ddebug's. Returns 0 on success | |
384 | * or <0 on error. | |
385 | */ | |
386 | static int ddebug_parse_flags(const char *str, unsigned int *flagsp, | |
387 | unsigned int *maskp) | |
388 | { | |
389 | unsigned flags = 0; | |
8ba6ebf5 | 390 | int op = '=', i; |
e9d376f0 JB |
391 | |
392 | switch (*str) { | |
393 | case '+': | |
394 | case '-': | |
395 | case '=': | |
396 | op = *str++; | |
397 | break; | |
398 | default: | |
18c216c5 | 399 | pr_err("bad flag-op %c, at start of %s\n", *str, str); |
e9d376f0 JB |
400 | return -EINVAL; |
401 | } | |
b8ccd5de | 402 | vpr_info("op='%c'\n", op); |
e9d376f0 | 403 | |
f657fd21 | 404 | for (; *str ; ++str) { |
8ba6ebf5 BVA |
405 | for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) { |
406 | if (*str == opt_array[i].opt_char) { | |
407 | flags |= opt_array[i].flag; | |
408 | break; | |
409 | } | |
e9d376f0 | 410 | } |
18c216c5 JC |
411 | if (i < 0) { |
412 | pr_err("unknown flag '%c' in \"%s\"\n", *str, str); | |
8ba6ebf5 | 413 | return -EINVAL; |
18c216c5 | 414 | } |
e9d376f0 | 415 | } |
b8ccd5de | 416 | vpr_info("flags=0x%x\n", flags); |
e9d376f0 JB |
417 | |
418 | /* calculate final *flagsp, *maskp according to mask and op */ | |
419 | switch (op) { | |
420 | case '=': | |
421 | *maskp = 0; | |
422 | *flagsp = flags; | |
423 | break; | |
424 | case '+': | |
425 | *maskp = ~0U; | |
426 | *flagsp = flags; | |
427 | break; | |
428 | case '-': | |
429 | *maskp = ~flags; | |
430 | *flagsp = 0; | |
431 | break; | |
432 | } | |
b8ccd5de | 433 | vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp); |
e9d376f0 JB |
434 | return 0; |
435 | } | |
436 | ||
8e59b5cf | 437 | static int ddebug_exec_query(char *query_string, const char *modname) |
fd89cfb8 TR |
438 | { |
439 | unsigned int flags = 0, mask = 0; | |
440 | struct ddebug_query query; | |
441 | #define MAXWORDS 9 | |
85f7f6c0 | 442 | int nwords, nfound; |
fd89cfb8 TR |
443 | char *words[MAXWORDS]; |
444 | ||
445 | nwords = ddebug_tokenize(query_string, words, MAXWORDS); | |
18c216c5 JC |
446 | if (nwords <= 0) { |
447 | pr_err("tokenize failed\n"); | |
fd89cfb8 | 448 | return -EINVAL; |
18c216c5 JC |
449 | } |
450 | /* check flags 1st (last arg) so query is pairs of spec,val */ | |
451 | if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) { | |
452 | pr_err("flags parse failed\n"); | |
fd89cfb8 | 453 | return -EINVAL; |
18c216c5 JC |
454 | } |
455 | if (ddebug_parse_query(words, nwords-1, &query, modname)) { | |
456 | pr_err("query parse failed\n"); | |
fd89cfb8 | 457 | return -EINVAL; |
18c216c5 | 458 | } |
fd89cfb8 | 459 | /* actually go and implement the change */ |
85f7f6c0 | 460 | nfound = ddebug_change(&query, flags, mask); |
f657fd21 | 461 | vpr_info_dq(&query, nfound ? "applied" : "no-match"); |
85f7f6c0 JC |
462 | |
463 | return nfound; | |
464 | } | |
465 | ||
466 | /* handle multiple queries in query string, continue on error, return | |
467 | last error or number of matching callsites. Module name is either | |
468 | in param (for boot arg) or perhaps in query string. | |
469 | */ | |
8e59b5cf | 470 | static int ddebug_exec_queries(char *query, const char *modname) |
85f7f6c0 JC |
471 | { |
472 | char *split; | |
473 | int i, errs = 0, exitcode = 0, rc, nfound = 0; | |
474 | ||
475 | for (i = 0; query; query = split) { | |
476 | split = strpbrk(query, ";\n"); | |
477 | if (split) | |
478 | *split++ = '\0'; | |
479 | ||
480 | query = skip_spaces(query); | |
481 | if (!query || !*query || *query == '#') | |
482 | continue; | |
483 | ||
b8ccd5de | 484 | vpr_info("query %d: \"%s\"\n", i, query); |
85f7f6c0 | 485 | |
8e59b5cf | 486 | rc = ddebug_exec_query(query, modname); |
85f7f6c0 JC |
487 | if (rc < 0) { |
488 | errs++; | |
489 | exitcode = rc; | |
f657fd21 | 490 | } else { |
85f7f6c0 | 491 | nfound += rc; |
f657fd21 | 492 | } |
85f7f6c0 JC |
493 | i++; |
494 | } | |
b8ccd5de | 495 | vpr_info("processed %d queries, with %d matches, %d errs\n", |
85f7f6c0 JC |
496 | i, nfound, errs); |
497 | ||
498 | if (exitcode) | |
499 | return exitcode; | |
500 | return nfound; | |
fd89cfb8 TR |
501 | } |
502 | ||
431625da JB |
503 | #define PREFIX_SIZE 64 |
504 | ||
505 | static int remaining(int wrote) | |
506 | { | |
507 | if (PREFIX_SIZE - wrote > 0) | |
508 | return PREFIX_SIZE - wrote; | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf) | |
8ba6ebf5 | 513 | { |
431625da JB |
514 | int pos_after_tid; |
515 | int pos = 0; | |
8ba6ebf5 | 516 | |
798efc60 JP |
517 | *buf = '\0'; |
518 | ||
431625da | 519 | if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
8ba6ebf5 | 520 | if (in_interrupt()) |
798efc60 | 521 | pos += snprintf(buf + pos, remaining(pos), "<intr> "); |
8ba6ebf5 | 522 | else |
431625da | 523 | pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
798efc60 | 524 | task_pid_vnr(current)); |
8ba6ebf5 | 525 | } |
431625da JB |
526 | pos_after_tid = pos; |
527 | if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) | |
528 | pos += snprintf(buf + pos, remaining(pos), "%s:", | |
798efc60 | 529 | desc->modname); |
431625da JB |
530 | if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) |
531 | pos += snprintf(buf + pos, remaining(pos), "%s:", | |
798efc60 | 532 | desc->function); |
431625da | 533 | if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
07100be7 | 534 | pos += snprintf(buf + pos, remaining(pos), "%d:", |
798efc60 | 535 | desc->lineno); |
431625da JB |
536 | if (pos - pos_after_tid) |
537 | pos += snprintf(buf + pos, remaining(pos), " "); | |
538 | if (pos >= PREFIX_SIZE) | |
539 | buf[PREFIX_SIZE - 1] = '\0'; | |
6c2140ee | 540 | |
431625da | 541 | return buf; |
6c2140ee JP |
542 | } |
543 | ||
906d2015 | 544 | void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
8ba6ebf5 BVA |
545 | { |
546 | va_list args; | |
431625da JB |
547 | struct va_format vaf; |
548 | char buf[PREFIX_SIZE]; | |
8ba6ebf5 BVA |
549 | |
550 | BUG_ON(!descriptor); | |
551 | BUG_ON(!fmt); | |
552 | ||
553 | va_start(args, fmt); | |
798efc60 | 554 | |
431625da JB |
555 | vaf.fmt = fmt; |
556 | vaf.va = &args; | |
798efc60 | 557 | |
906d2015 | 558 | printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
798efc60 | 559 | |
8ba6ebf5 | 560 | va_end(args); |
8ba6ebf5 BVA |
561 | } |
562 | EXPORT_SYMBOL(__dynamic_pr_debug); | |
563 | ||
906d2015 | 564 | void __dynamic_dev_dbg(struct _ddebug *descriptor, |
cbc46635 JP |
565 | const struct device *dev, const char *fmt, ...) |
566 | { | |
567 | struct va_format vaf; | |
568 | va_list args; | |
cbc46635 JP |
569 | |
570 | BUG_ON(!descriptor); | |
571 | BUG_ON(!fmt); | |
572 | ||
573 | va_start(args, fmt); | |
798efc60 | 574 | |
cbc46635 JP |
575 | vaf.fmt = fmt; |
576 | vaf.va = &args; | |
798efc60 JP |
577 | |
578 | if (!dev) { | |
906d2015 | 579 | printk(KERN_DEBUG "(NULL device *): %pV", &vaf); |
798efc60 JP |
580 | } else { |
581 | char buf[PREFIX_SIZE]; | |
798efc60 | 582 | |
a39d4a85 | 583 | dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV", |
906d2015 JP |
584 | dynamic_emit_prefix(descriptor, buf), |
585 | dev_driver_string(dev), dev_name(dev), | |
586 | &vaf); | |
798efc60 JP |
587 | } |
588 | ||
cbc46635 | 589 | va_end(args); |
cbc46635 JP |
590 | } |
591 | EXPORT_SYMBOL(__dynamic_dev_dbg); | |
592 | ||
0feefd97 JB |
593 | #ifdef CONFIG_NET |
594 | ||
906d2015 JP |
595 | void __dynamic_netdev_dbg(struct _ddebug *descriptor, |
596 | const struct net_device *dev, const char *fmt, ...) | |
ffa10cb4 JB |
597 | { |
598 | struct va_format vaf; | |
599 | va_list args; | |
ffa10cb4 JB |
600 | |
601 | BUG_ON(!descriptor); | |
602 | BUG_ON(!fmt); | |
603 | ||
604 | va_start(args, fmt); | |
b004ff49 | 605 | |
ffa10cb4 JB |
606 | vaf.fmt = fmt; |
607 | vaf.va = &args; | |
b004ff49 JP |
608 | |
609 | if (dev && dev->dev.parent) { | |
610 | char buf[PREFIX_SIZE]; | |
666f355f | 611 | |
a39d4a85 | 612 | dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent, |
906d2015 JP |
613 | "%s%s %s %s%s: %pV", |
614 | dynamic_emit_prefix(descriptor, buf), | |
615 | dev_driver_string(dev->dev.parent), | |
616 | dev_name(dev->dev.parent), | |
617 | netdev_name(dev), netdev_reg_state(dev), | |
618 | &vaf); | |
b004ff49 | 619 | } else if (dev) { |
906d2015 JP |
620 | printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev), |
621 | netdev_reg_state(dev), &vaf); | |
b004ff49 | 622 | } else { |
906d2015 | 623 | printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); |
b004ff49 JP |
624 | } |
625 | ||
ffa10cb4 | 626 | va_end(args); |
ffa10cb4 JB |
627 | } |
628 | EXPORT_SYMBOL(__dynamic_netdev_dbg); | |
629 | ||
0feefd97 JB |
630 | #endif |
631 | ||
bc757f6f JC |
632 | #define DDEBUG_STRING_SIZE 1024 |
633 | static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; | |
634 | ||
a648ec05 TR |
635 | static __init int ddebug_setup_query(char *str) |
636 | { | |
bc757f6f | 637 | if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5 | 638 | pr_warn("ddebug boot param string too large\n"); |
a648ec05 TR |
639 | return 0; |
640 | } | |
bc757f6f | 641 | strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05 TR |
642 | return 1; |
643 | } | |
644 | ||
645 | __setup("ddebug_query=", ddebug_setup_query); | |
646 | ||
e9d376f0 | 647 | /* |
231821d4 | 648 | * File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the |
e9d376f0 JB |
649 | * command text from userspace, parses and executes it. |
650 | */ | |
7281491c | 651 | #define USER_BUF_PAGE 4096 |
e9d376f0 JB |
652 | static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, |
653 | size_t len, loff_t *offp) | |
654 | { | |
7281491c | 655 | char *tmpbuf; |
fd89cfb8 | 656 | int ret; |
e9d376f0 JB |
657 | |
658 | if (len == 0) | |
659 | return 0; | |
7281491c JC |
660 | if (len > USER_BUF_PAGE - 1) { |
661 | pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE); | |
e9d376f0 | 662 | return -E2BIG; |
7281491c JC |
663 | } |
664 | tmpbuf = kmalloc(len + 1, GFP_KERNEL); | |
665 | if (!tmpbuf) | |
666 | return -ENOMEM; | |
667 | if (copy_from_user(tmpbuf, ubuf, len)) { | |
668 | kfree(tmpbuf); | |
e9d376f0 | 669 | return -EFAULT; |
7281491c | 670 | } |
e9d376f0 | 671 | tmpbuf[len] = '\0'; |
b8ccd5de | 672 | vpr_info("read %d bytes from userspace\n", (int)len); |
e9d376f0 | 673 | |
8e59b5cf | 674 | ret = ddebug_exec_queries(tmpbuf, NULL); |
7281491c | 675 | kfree(tmpbuf); |
85f7f6c0 | 676 | if (ret < 0) |
fd89cfb8 | 677 | return ret; |
e9d376f0 JB |
678 | |
679 | *offp += len; | |
680 | return len; | |
681 | } | |
682 | ||
683 | /* | |
684 | * Set the iterator to point to the first _ddebug object | |
685 | * and return a pointer to that first object. Returns | |
686 | * NULL if there are no _ddebugs at all. | |
687 | */ | |
688 | static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter) | |
689 | { | |
690 | if (list_empty(&ddebug_tables)) { | |
691 | iter->table = NULL; | |
692 | iter->idx = 0; | |
693 | return NULL; | |
694 | } | |
695 | iter->table = list_entry(ddebug_tables.next, | |
696 | struct ddebug_table, link); | |
697 | iter->idx = 0; | |
698 | return &iter->table->ddebugs[iter->idx]; | |
699 | } | |
700 | ||
701 | /* | |
702 | * Advance the iterator to point to the next _ddebug | |
703 | * object from the one the iterator currently points at, | |
704 | * and returns a pointer to the new _ddebug. Returns | |
705 | * NULL if the iterator has seen all the _ddebugs. | |
706 | */ | |
707 | static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter) | |
708 | { | |
709 | if (iter->table == NULL) | |
710 | return NULL; | |
711 | if (++iter->idx == iter->table->num_ddebugs) { | |
712 | /* iterate to next table */ | |
713 | iter->idx = 0; | |
714 | if (list_is_last(&iter->table->link, &ddebug_tables)) { | |
715 | iter->table = NULL; | |
716 | return NULL; | |
717 | } | |
718 | iter->table = list_entry(iter->table->link.next, | |
719 | struct ddebug_table, link); | |
720 | } | |
721 | return &iter->table->ddebugs[iter->idx]; | |
722 | } | |
723 | ||
724 | /* | |
725 | * Seq_ops start method. Called at the start of every | |
726 | * read() call from userspace. Takes the ddebug_lock and | |
727 | * seeks the seq_file's iterator to the given position. | |
728 | */ | |
729 | static void *ddebug_proc_start(struct seq_file *m, loff_t *pos) | |
730 | { | |
731 | struct ddebug_iter *iter = m->private; | |
732 | struct _ddebug *dp; | |
733 | int n = *pos; | |
734 | ||
b8ccd5de | 735 | vpr_info("called m=%p *pos=%lld\n", m, (unsigned long long)*pos); |
e9d376f0 JB |
736 | |
737 | mutex_lock(&ddebug_lock); | |
738 | ||
739 | if (!n) | |
740 | return SEQ_START_TOKEN; | |
741 | if (n < 0) | |
742 | return NULL; | |
743 | dp = ddebug_iter_first(iter); | |
744 | while (dp != NULL && --n > 0) | |
745 | dp = ddebug_iter_next(iter); | |
746 | return dp; | |
747 | } | |
748 | ||
749 | /* | |
750 | * Seq_ops next method. Called several times within a read() | |
751 | * call from userspace, with ddebug_lock held. Walks to the | |
752 | * next _ddebug object with a special case for the header line. | |
753 | */ | |
754 | static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos) | |
755 | { | |
756 | struct ddebug_iter *iter = m->private; | |
757 | struct _ddebug *dp; | |
758 | ||
b8ccd5de | 759 | vpr_info("called m=%p p=%p *pos=%lld\n", |
f657fd21 | 760 | m, p, (unsigned long long)*pos); |
e9d376f0 JB |
761 | |
762 | if (p == SEQ_START_TOKEN) | |
763 | dp = ddebug_iter_first(iter); | |
764 | else | |
765 | dp = ddebug_iter_next(iter); | |
766 | ++*pos; | |
767 | return dp; | |
768 | } | |
769 | ||
770 | /* | |
771 | * Seq_ops show method. Called several times within a read() | |
772 | * call from userspace, with ddebug_lock held. Formats the | |
773 | * current _ddebug as a single human-readable line, with a | |
774 | * special case for the header line. | |
775 | */ | |
776 | static int ddebug_proc_show(struct seq_file *m, void *p) | |
777 | { | |
778 | struct ddebug_iter *iter = m->private; | |
779 | struct _ddebug *dp = p; | |
5ca7d2a6 | 780 | char flagsbuf[10]; |
e9d376f0 | 781 | |
b8ccd5de | 782 | vpr_info("called m=%p p=%p\n", m, p); |
e9d376f0 JB |
783 | |
784 | if (p == SEQ_START_TOKEN) { | |
785 | seq_puts(m, | |
f657fd21 | 786 | "# filename:lineno [module]function flags format\n"); |
e9d376f0 JB |
787 | return 0; |
788 | } | |
789 | ||
5ca7d2a6 | 790 | seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21 JP |
791 | trim_prefix(dp->filename), dp->lineno, |
792 | iter->table->mod_name, dp->function, | |
793 | ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf))); | |
e9d376f0 JB |
794 | seq_escape(m, dp->format, "\t\r\n\""); |
795 | seq_puts(m, "\"\n"); | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
800 | /* | |
801 | * Seq_ops stop method. Called at the end of each read() | |
802 | * call from userspace. Drops ddebug_lock. | |
803 | */ | |
804 | static void ddebug_proc_stop(struct seq_file *m, void *p) | |
805 | { | |
b8ccd5de | 806 | vpr_info("called m=%p p=%p\n", m, p); |
e9d376f0 JB |
807 | mutex_unlock(&ddebug_lock); |
808 | } | |
809 | ||
810 | static const struct seq_operations ddebug_proc_seqops = { | |
811 | .start = ddebug_proc_start, | |
812 | .next = ddebug_proc_next, | |
813 | .show = ddebug_proc_show, | |
814 | .stop = ddebug_proc_stop | |
815 | }; | |
816 | ||
817 | /* | |
07100be7 JC |
818 | * File_ops->open method for <debugfs>/dynamic_debug/control. Does |
819 | * the seq_file setup dance, and also creates an iterator to walk the | |
820 | * _ddebugs. Note that we create a seq_file always, even for O_WRONLY | |
821 | * files where it's not needed, as doing so simplifies the ->release | |
822 | * method. | |
e9d376f0 JB |
823 | */ |
824 | static int ddebug_proc_open(struct inode *inode, struct file *file) | |
825 | { | |
b8ccd5de | 826 | vpr_info("called\n"); |
4bad78c5 RJ |
827 | return seq_open_private(file, &ddebug_proc_seqops, |
828 | sizeof(struct ddebug_iter)); | |
e9d376f0 JB |
829 | } |
830 | ||
831 | static const struct file_operations ddebug_proc_fops = { | |
832 | .owner = THIS_MODULE, | |
833 | .open = ddebug_proc_open, | |
834 | .read = seq_read, | |
835 | .llseek = seq_lseek, | |
836 | .release = seq_release_private, | |
837 | .write = ddebug_proc_write | |
838 | }; | |
839 | ||
840 | /* | |
841 | * Allocate a new ddebug_table for the given module | |
842 | * and add it to the global list. | |
843 | */ | |
844 | int ddebug_add_module(struct _ddebug *tab, unsigned int n, | |
845 | const char *name) | |
846 | { | |
847 | struct ddebug_table *dt; | |
3e406b1d | 848 | const char *new_name; |
e9d376f0 JB |
849 | |
850 | dt = kzalloc(sizeof(*dt), GFP_KERNEL); | |
851 | if (dt == NULL) | |
852 | return -ENOMEM; | |
3e406b1d | 853 | new_name = kstrdup_const(name, GFP_KERNEL); |
e9d376f0 JB |
854 | if (new_name == NULL) { |
855 | kfree(dt); | |
856 | return -ENOMEM; | |
857 | } | |
858 | dt->mod_name = new_name; | |
859 | dt->num_ddebugs = n; | |
e9d376f0 JB |
860 | dt->ddebugs = tab; |
861 | ||
862 | mutex_lock(&ddebug_lock); | |
863 | list_add_tail(&dt->link, &ddebug_tables); | |
864 | mutex_unlock(&ddebug_lock); | |
865 | ||
b8ccd5de | 866 | vpr_info("%u debug prints in module %s\n", n, dt->mod_name); |
e9d376f0 JB |
867 | return 0; |
868 | } | |
869 | EXPORT_SYMBOL_GPL(ddebug_add_module); | |
870 | ||
6ab676e9 JC |
871 | /* helper for ddebug_dyndbg_(boot|module)_param_cb */ |
872 | static int ddebug_dyndbg_param_cb(char *param, char *val, | |
873 | const char *modname, int on_err) | |
b48420c1 | 874 | { |
b48420c1 JC |
875 | char *sep; |
876 | ||
877 | sep = strchr(param, '.'); | |
878 | if (sep) { | |
6ab676e9 | 879 | /* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1 JC |
880 | *sep = '\0'; |
881 | modname = param; | |
882 | param = sep + 1; | |
883 | } | |
884 | if (strcmp(param, "dyndbg")) | |
6ab676e9 | 885 | return on_err; /* determined by caller */ |
b48420c1 | 886 | |
8e59b5cf JC |
887 | ddebug_exec_queries((val ? val : "+p"), modname); |
888 | ||
b48420c1 JC |
889 | return 0; /* query failure shouldnt stop module load */ |
890 | } | |
891 | ||
6ab676e9 JC |
892 | /* handle both dyndbg and $module.dyndbg params at boot */ |
893 | static int ddebug_dyndbg_boot_param_cb(char *param, char *val, | |
ecc86170 | 894 | const char *unused, void *arg) |
b48420c1 | 895 | { |
6ab676e9 JC |
896 | vpr_info("%s=\"%s\"\n", param, val); |
897 | return ddebug_dyndbg_param_cb(param, val, NULL, 0); | |
898 | } | |
b48420c1 | 899 | |
6ab676e9 JC |
900 | /* |
901 | * modprobe foo finds foo.params in boot-args, strips "foo.", and | |
902 | * passes them to load_module(). This callback gets unknown params, | |
903 | * processes dyndbg params, rejects others. | |
904 | */ | |
905 | int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module) | |
906 | { | |
907 | vpr_info("module: %s %s=\"%s\"\n", module, param, val); | |
908 | return ddebug_dyndbg_param_cb(param, val, module, -ENOENT); | |
b48420c1 JC |
909 | } |
910 | ||
e9d376f0 JB |
911 | static void ddebug_table_free(struct ddebug_table *dt) |
912 | { | |
913 | list_del_init(&dt->link); | |
3e406b1d | 914 | kfree_const(dt->mod_name); |
e9d376f0 JB |
915 | kfree(dt); |
916 | } | |
917 | ||
918 | /* | |
919 | * Called in response to a module being unloaded. Removes | |
920 | * any ddebug_table's which point at the module. | |
921 | */ | |
ff49d74a | 922 | int ddebug_remove_module(const char *mod_name) |
e9d376f0 JB |
923 | { |
924 | struct ddebug_table *dt, *nextdt; | |
925 | int ret = -ENOENT; | |
926 | ||
b8ccd5de | 927 | vpr_info("removing module \"%s\"\n", mod_name); |
e9d376f0 JB |
928 | |
929 | mutex_lock(&ddebug_lock); | |
930 | list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) { | |
931 | if (!strcmp(dt->mod_name, mod_name)) { | |
932 | ddebug_table_free(dt); | |
933 | ret = 0; | |
934 | } | |
935 | } | |
936 | mutex_unlock(&ddebug_lock); | |
937 | return ret; | |
938 | } | |
939 | EXPORT_SYMBOL_GPL(ddebug_remove_module); | |
940 | ||
941 | static void ddebug_remove_all_tables(void) | |
942 | { | |
943 | mutex_lock(&ddebug_lock); | |
944 | while (!list_empty(&ddebug_tables)) { | |
945 | struct ddebug_table *dt = list_entry(ddebug_tables.next, | |
946 | struct ddebug_table, | |
947 | link); | |
948 | ddebug_table_free(dt); | |
949 | } | |
950 | mutex_unlock(&ddebug_lock); | |
951 | } | |
952 | ||
6a5c083d TR |
953 | static __initdata int ddebug_init_success; |
954 | ||
955 | static int __init dynamic_debug_init_debugfs(void) | |
e9d376f0 JB |
956 | { |
957 | struct dentry *dir, *file; | |
6a5c083d TR |
958 | |
959 | if (!ddebug_init_success) | |
960 | return -ENODEV; | |
e9d376f0 JB |
961 | |
962 | dir = debugfs_create_dir("dynamic_debug", NULL); | |
963 | if (!dir) | |
964 | return -ENOMEM; | |
965 | file = debugfs_create_file("control", 0644, dir, NULL, | |
966 | &ddebug_proc_fops); | |
967 | if (!file) { | |
968 | debugfs_remove(dir); | |
969 | return -ENOMEM; | |
970 | } | |
6a5c083d TR |
971 | return 0; |
972 | } | |
973 | ||
974 | static int __init dynamic_debug_init(void) | |
975 | { | |
976 | struct _ddebug *iter, *iter_start; | |
977 | const char *modname = NULL; | |
b48420c1 | 978 | char *cmdline; |
6a5c083d | 979 | int ret = 0; |
41076927 JC |
980 | int n = 0, entries = 0, modct = 0; |
981 | int verbose_bytes = 0; | |
6a5c083d | 982 | |
b5b78f83 | 983 | if (__start___verbose == __stop___verbose) { |
f657fd21 | 984 | pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n"); |
b5b78f83 JC |
985 | return 1; |
986 | } | |
987 | iter = __start___verbose; | |
988 | modname = iter->modname; | |
989 | iter_start = iter; | |
990 | for (; iter < __stop___verbose; iter++) { | |
41076927 JC |
991 | entries++; |
992 | verbose_bytes += strlen(iter->modname) + strlen(iter->function) | |
993 | + strlen(iter->filename) + strlen(iter->format); | |
994 | ||
b5b78f83 | 995 | if (strcmp(modname, iter->modname)) { |
41076927 | 996 | modct++; |
b5b78f83 JC |
997 | ret = ddebug_add_module(iter_start, n, modname); |
998 | if (ret) | |
af442399 | 999 | goto out_err; |
b5b78f83 JC |
1000 | n = 0; |
1001 | modname = iter->modname; | |
1002 | iter_start = iter; | |
e9d376f0 | 1003 | } |
b5b78f83 | 1004 | n++; |
e9d376f0 | 1005 | } |
b5b78f83 JC |
1006 | ret = ddebug_add_module(iter_start, n, modname); |
1007 | if (ret) | |
af442399 | 1008 | goto out_err; |
a648ec05 | 1009 | |
af442399 | 1010 | ddebug_init_success = 1; |
f657fd21 JP |
1011 | vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in (readonly) verbose section\n", |
1012 | modct, entries, (int)(modct * sizeof(struct ddebug_table)), | |
1013 | verbose_bytes + (int)(__stop___verbose - __start___verbose)); | |
af442399 JC |
1014 | |
1015 | /* apply ddebug_query boot param, dont unload tables on err */ | |
a648ec05 | 1016 | if (ddebug_setup_string[0] != '\0') { |
f657fd21 | 1017 | pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n"); |
8e59b5cf | 1018 | ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0 | 1019 | if (ret < 0) |
f657fd21 | 1020 | pr_warn("Invalid ddebug boot param %s\n", |
4ad275e5 | 1021 | ddebug_setup_string); |
a648ec05 | 1022 | else |
85f7f6c0 | 1023 | pr_info("%d changes by ddebug_query\n", ret); |
a648ec05 | 1024 | } |
b48420c1 JC |
1025 | /* now that ddebug tables are loaded, process all boot args |
1026 | * again to find and activate queries given in dyndbg params. | |
1027 | * While this has already been done for known boot params, it | |
1028 | * ignored the unknown ones (dyndbg in particular). Reusing | |
1029 | * parse_args avoids ad-hoc parsing. This will also attempt | |
1030 | * to activate queries for not-yet-loaded modules, which is | |
1031 | * slightly noisy if verbose, but harmless. | |
1032 | */ | |
1033 | cmdline = kstrdup(saved_command_line, GFP_KERNEL); | |
1034 | parse_args("dyndbg params", cmdline, NULL, | |
ecc86170 | 1035 | 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb); |
b48420c1 | 1036 | kfree(cmdline); |
af442399 | 1037 | return 0; |
a648ec05 | 1038 | |
af442399 JC |
1039 | out_err: |
1040 | ddebug_remove_all_tables(); | |
e9d376f0 JB |
1041 | return 0; |
1042 | } | |
6a5c083d | 1043 | /* Allow early initialization for boot messages via boot param */ |
3ec5652a | 1044 | early_initcall(dynamic_debug_init); |
b48420c1 | 1045 | |
6a5c083d | 1046 | /* Debugfs setup must be done later */ |
3ec5652a | 1047 | fs_initcall(dynamic_debug_init_debugfs); |