Commit | Line | Data |
---|---|---|
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. |
e9d376f0 JB |
11 | */ |
12 | ||
4ad275e5 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
14 | ||
e9d376f0 JB |
15 | #include <linux/kernel.h> |
16 | #include <linux/module.h> | |
fef15d2f GKH |
17 | #include <linux/moduleparam.h> |
18 | #include <linux/kallsyms.h> | |
19 | #include <linux/types.h> | |
e9d376f0 | 20 | #include <linux/mutex.h> |
fef15d2f | 21 | #include <linux/proc_fs.h> |
e9d376f0 | 22 | #include <linux/seq_file.h> |
fef15d2f GKH |
23 | #include <linux/list.h> |
24 | #include <linux/sysctl.h> | |
e9d376f0 | 25 | #include <linux/ctype.h> |
fef15d2f GKH |
26 | #include <linux/string.h> |
27 | #include <linux/uaccess.h> | |
e9d376f0 JB |
28 | #include <linux/dynamic_debug.h> |
29 | #include <linux/debugfs.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
fef15d2f | 31 | #include <linux/jump_label.h> |
8ba6ebf5 | 32 | #include <linux/hardirq.h> |
e8d9792a | 33 | #include <linux/sched.h> |
fef15d2f | 34 | #include <linux/device.h> |
ffa10cb4 | 35 | #include <linux/netdevice.h> |
e9d376f0 JB |
36 | |
37 | extern struct _ddebug __start___verbose[]; | |
38 | extern struct _ddebug __stop___verbose[]; | |
39 | ||
e9d376f0 JB |
40 | struct ddebug_table { |
41 | struct list_head link; | |
42 | char *mod_name; | |
43 | unsigned int num_ddebugs; | |
e9d376f0 JB |
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); | |
f657fd21 | 62 | static int verbose; |
74df138d | 63 | module_param(verbose, int, 0644); |
e9d376f0 | 64 | |
2b678319 JC |
65 | /* Return the path relative to source root */ |
66 | static inline const char *trim_prefix(const char *path) | |
67 | { | |
68 | int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c"); | |
69 | ||
70 | if (strncmp(path, __FILE__, skip)) | |
71 | skip = 0; /* prefix mismatch, don't skip */ | |
72 | ||
73 | return path + skip; | |
74 | } | |
75 | ||
8ba6ebf5 BVA |
76 | static struct { unsigned flag:8; char opt_char; } opt_array[] = { |
77 | { _DPRINTK_FLAGS_PRINT, 'p' }, | |
78 | { _DPRINTK_FLAGS_INCL_MODNAME, 'm' }, | |
79 | { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' }, | |
80 | { _DPRINTK_FLAGS_INCL_LINENO, 'l' }, | |
81 | { _DPRINTK_FLAGS_INCL_TID, 't' }, | |
5ca7d2a6 | 82 | { _DPRINTK_FLAGS_NONE, '_' }, |
8ba6ebf5 BVA |
83 | }; |
84 | ||
e9d376f0 JB |
85 | /* format a string into buf[] which describes the _ddebug's flags */ |
86 | static char *ddebug_describe_flags(struct _ddebug *dp, char *buf, | |
87 | size_t maxlen) | |
88 | { | |
89 | char *p = buf; | |
8ba6ebf5 | 90 | int i; |
e9d376f0 | 91 | |
5ca7d2a6 | 92 | BUG_ON(maxlen < 6); |
8ba6ebf5 BVA |
93 | for (i = 0; i < ARRAY_SIZE(opt_array); ++i) |
94 | if (dp->flags & opt_array[i].flag) | |
95 | *p++ = opt_array[i].opt_char; | |
e9d376f0 | 96 | if (p == buf) |
5ca7d2a6 | 97 | *p++ = '_'; |
e9d376f0 JB |
98 | *p = '\0'; |
99 | ||
100 | return buf; | |
101 | } | |
102 | ||
f657fd21 | 103 | #define vpr_info(fmt, ...) \ |
b8ccd5de | 104 | do { \ |
f657fd21 JP |
105 | if (verbose) \ |
106 | pr_info(fmt, ##__VA_ARGS__); \ | |
574b3725 JC |
107 | } while (0) |
108 | ||
f657fd21 JP |
109 | static void vpr_info_dq(const struct ddebug_query *query, const char *msg) |
110 | { | |
111 | /* trim any trailing newlines */ | |
112 | int fmtlen = 0; | |
113 | ||
114 | if (query->format) { | |
115 | fmtlen = strlen(query->format); | |
116 | while (fmtlen && query->format[fmtlen - 1] == '\n') | |
117 | fmtlen--; | |
118 | } | |
119 | ||
120 | vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n", | |
121 | msg, | |
122 | query->function ? query->function : "", | |
123 | query->filename ? query->filename : "", | |
124 | query->module ? query->module : "", | |
125 | fmtlen, query->format ? query->format : "", | |
126 | query->first_lineno, query->last_lineno); | |
127 | } | |
128 | ||
e9d376f0 | 129 | /* |
85f7f6c0 JC |
130 | * Search the tables for _ddebug's which match the given `query' and |
131 | * apply the `flags' and `mask' to them. Returns number of matching | |
132 | * callsites, normally the same as number of changes. If verbose, | |
133 | * logs the changes. Takes ddebug_lock. | |
e9d376f0 | 134 | */ |
85f7f6c0 JC |
135 | static int ddebug_change(const struct ddebug_query *query, |
136 | unsigned int flags, unsigned int mask) | |
e9d376f0 JB |
137 | { |
138 | int i; | |
139 | struct ddebug_table *dt; | |
140 | unsigned int newflags; | |
141 | unsigned int nfound = 0; | |
5ca7d2a6 | 142 | char flagbuf[10]; |
e9d376f0 JB |
143 | |
144 | /* search for matching ddebugs */ | |
145 | mutex_lock(&ddebug_lock); | |
146 | list_for_each_entry(dt, &ddebug_tables, link) { | |
147 | ||
148 | /* match against the module name */ | |
d6a238d2 | 149 | if (query->module && strcmp(query->module, dt->mod_name)) |
e9d376f0 JB |
150 | continue; |
151 | ||
f657fd21 | 152 | for (i = 0; i < dt->num_ddebugs; i++) { |
e9d376f0 JB |
153 | struct _ddebug *dp = &dt->ddebugs[i]; |
154 | ||
155 | /* match against the source filename */ | |
d6a238d2 | 156 | if (query->filename && |
e9d376f0 | 157 | strcmp(query->filename, dp->filename) && |
35367ab2 | 158 | strcmp(query->filename, kbasename(dp->filename)) && |
2b678319 | 159 | strcmp(query->filename, trim_prefix(dp->filename))) |
e9d376f0 JB |
160 | continue; |
161 | ||
162 | /* match against the function */ | |
d6a238d2 | 163 | if (query->function && |
e9d376f0 JB |
164 | strcmp(query->function, dp->function)) |
165 | continue; | |
166 | ||
167 | /* match against the format */ | |
d6a238d2 JC |
168 | if (query->format && |
169 | !strstr(dp->format, query->format)) | |
e9d376f0 JB |
170 | continue; |
171 | ||
172 | /* match against the line number range */ | |
173 | if (query->first_lineno && | |
174 | dp->lineno < query->first_lineno) | |
175 | continue; | |
176 | if (query->last_lineno && | |
177 | dp->lineno > query->last_lineno) | |
178 | continue; | |
179 | ||
180 | nfound++; | |
181 | ||
182 | newflags = (dp->flags & mask) | flags; | |
183 | if (newflags == dp->flags) | |
184 | continue; | |
e9d376f0 | 185 | dp->flags = newflags; |
b8ccd5de | 186 | vpr_info("changed %s:%d [%s]%s =%s\n", |
f657fd21 JP |
187 | trim_prefix(dp->filename), dp->lineno, |
188 | dt->mod_name, dp->function, | |
189 | ddebug_describe_flags(dp, flagbuf, | |
190 | sizeof(flagbuf))); | |
e9d376f0 JB |
191 | } |
192 | } | |
193 | mutex_unlock(&ddebug_lock); | |
194 | ||
195 | if (!nfound && verbose) | |
4ad275e5 | 196 | pr_info("no matches for query\n"); |
85f7f6c0 JC |
197 | |
198 | return nfound; | |
e9d376f0 JB |
199 | } |
200 | ||
e9d376f0 JB |
201 | /* |
202 | * Split the buffer `buf' into space-separated words. | |
9898abb3 GB |
203 | * Handles simple " and ' quoting, i.e. without nested, |
204 | * embedded or escaped \". Return the number of words | |
205 | * or <0 on error. | |
e9d376f0 JB |
206 | */ |
207 | static int ddebug_tokenize(char *buf, char *words[], int maxwords) | |
208 | { | |
209 | int nwords = 0; | |
210 | ||
9898abb3 GB |
211 | while (*buf) { |
212 | char *end; | |
213 | ||
214 | /* Skip leading whitespace */ | |
e7d2860b | 215 | buf = skip_spaces(buf); |
9898abb3 GB |
216 | if (!*buf) |
217 | break; /* oh, it was trailing whitespace */ | |
8bd6026e JC |
218 | if (*buf == '#') |
219 | break; /* token starts comment, skip rest of line */ | |
9898abb3 | 220 | |
07100be7 | 221 | /* find `end' of word, whitespace separated or quoted */ |
9898abb3 GB |
222 | if (*buf == '"' || *buf == '\'') { |
223 | int quote = *buf++; | |
f657fd21 | 224 | for (end = buf; *end && *end != quote; end++) |
9898abb3 | 225 | ; |
18c216c5 JC |
226 | if (!*end) { |
227 | pr_err("unclosed quote: %s\n", buf); | |
9898abb3 | 228 | return -EINVAL; /* unclosed quote */ |
18c216c5 | 229 | } |
9898abb3 | 230 | } else { |
f657fd21 | 231 | for (end = buf; *end && !isspace(*end); end++) |
9898abb3 GB |
232 | ; |
233 | BUG_ON(end == buf); | |
234 | } | |
9898abb3 | 235 | |
07100be7 | 236 | /* `buf' is start of word, `end' is one past its end */ |
18c216c5 JC |
237 | if (nwords == maxwords) { |
238 | pr_err("too many words, legal max <=%d\n", maxwords); | |
9898abb3 | 239 | return -EINVAL; /* ran out of words[] before bytes */ |
18c216c5 | 240 | } |
9898abb3 GB |
241 | if (*end) |
242 | *end++ = '\0'; /* terminate the word */ | |
243 | words[nwords++] = buf; | |
244 | buf = end; | |
245 | } | |
e9d376f0 JB |
246 | |
247 | if (verbose) { | |
248 | int i; | |
4ad275e5 | 249 | pr_info("split into words:"); |
f657fd21 | 250 | for (i = 0; i < nwords; i++) |
4ad275e5 JP |
251 | pr_cont(" \"%s\"", words[i]); |
252 | pr_cont("\n"); | |
e9d376f0 JB |
253 | } |
254 | ||
255 | return nwords; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Parse a single line number. Note that the empty string "" | |
260 | * is treated as a special case and converted to zero, which | |
261 | * is later treated as a "don't care" value. | |
262 | */ | |
263 | static inline int parse_lineno(const char *str, unsigned int *val) | |
264 | { | |
265 | char *end = NULL; | |
266 | BUG_ON(str == NULL); | |
267 | if (*str == '\0') { | |
268 | *val = 0; | |
269 | return 0; | |
270 | } | |
271 | *val = simple_strtoul(str, &end, 10); | |
18c216c5 JC |
272 | if (end == NULL || end == str || *end != '\0') { |
273 | pr_err("bad line-number: %s\n", str); | |
274 | return -EINVAL; | |
275 | } | |
276 | return 0; | |
e9d376f0 JB |
277 | } |
278 | ||
279 | /* | |
280 | * Undo octal escaping in a string, inplace. This is useful to | |
281 | * allow the user to express a query which matches a format | |
282 | * containing embedded spaces. | |
283 | */ | |
284 | #define isodigit(c) ((c) >= '0' && (c) <= '7') | |
285 | static char *unescape(char *str) | |
286 | { | |
287 | char *in = str; | |
288 | char *out = str; | |
289 | ||
290 | while (*in) { | |
291 | if (*in == '\\') { | |
292 | if (in[1] == '\\') { | |
293 | *out++ = '\\'; | |
294 | in += 2; | |
295 | continue; | |
296 | } else if (in[1] == 't') { | |
297 | *out++ = '\t'; | |
298 | in += 2; | |
299 | continue; | |
300 | } else if (in[1] == 'n') { | |
301 | *out++ = '\n'; | |
302 | in += 2; | |
303 | continue; | |
304 | } else if (isodigit(in[1]) && | |
f657fd21 JP |
305 | isodigit(in[2]) && |
306 | isodigit(in[3])) { | |
307 | *out++ = (((in[1] - '0') << 6) | | |
308 | ((in[2] - '0') << 3) | | |
309 | (in[3] - '0')); | |
e9d376f0 JB |
310 | in += 4; |
311 | continue; | |
312 | } | |
313 | } | |
314 | *out++ = *in++; | |
315 | } | |
316 | *out = '\0'; | |
317 | ||
318 | return str; | |
319 | } | |
320 | ||
820874c7 JC |
321 | static int check_set(const char **dest, char *src, char *name) |
322 | { | |
323 | int rc = 0; | |
324 | ||
325 | if (*dest) { | |
326 | rc = -EINVAL; | |
f657fd21 JP |
327 | pr_err("match-spec:%s val:%s overridden by %s\n", |
328 | name, *dest, src); | |
820874c7 JC |
329 | } |
330 | *dest = src; | |
331 | return rc; | |
332 | } | |
333 | ||
e9d376f0 JB |
334 | /* |
335 | * Parse words[] as a ddebug query specification, which is a series | |
336 | * of (keyword, value) pairs chosen from these possibilities: | |
337 | * | |
338 | * func <function-name> | |
339 | * file <full-pathname> | |
340 | * file <base-filename> | |
341 | * module <module-name> | |
342 | * format <escaped-string-to-find-in-format> | |
343 | * line <lineno> | |
344 | * line <first-lineno>-<last-lineno> // where either may be empty | |
820874c7 JC |
345 | * |
346 | * Only 1 of each type is allowed. | |
347 | * Returns 0 on success, <0 on error. | |
e9d376f0 JB |
348 | */ |
349 | static int ddebug_parse_query(char *words[], int nwords, | |
8e59b5cf | 350 | struct ddebug_query *query, const char *modname) |
e9d376f0 JB |
351 | { |
352 | unsigned int i; | |
820874c7 | 353 | int rc; |
e9d376f0 JB |
354 | |
355 | /* check we have an even number of words */ | |
18c216c5 JC |
356 | if (nwords % 2 != 0) { |
357 | pr_err("expecting pairs of match-spec <value>\n"); | |
e9d376f0 | 358 | return -EINVAL; |
18c216c5 | 359 | } |
e9d376f0 JB |
360 | memset(query, 0, sizeof(*query)); |
361 | ||
8e59b5cf JC |
362 | if (modname) |
363 | /* support $modname.dyndbg=<multiple queries> */ | |
364 | query->module = modname; | |
365 | ||
f657fd21 JP |
366 | for (i = 0; i < nwords; i += 2) { |
367 | if (!strcmp(words[i], "func")) { | |
820874c7 | 368 | rc = check_set(&query->function, words[i+1], "func"); |
f657fd21 | 369 | } else if (!strcmp(words[i], "file")) { |
820874c7 | 370 | rc = check_set(&query->filename, words[i+1], "file"); |
f657fd21 | 371 | } else if (!strcmp(words[i], "module")) { |
820874c7 | 372 | rc = check_set(&query->module, words[i+1], "module"); |
f657fd21 | 373 | } else if (!strcmp(words[i], "format")) { |
820874c7 | 374 | rc = check_set(&query->format, unescape(words[i+1]), |
f657fd21 JP |
375 | "format"); |
376 | } else if (!strcmp(words[i], "line")) { | |
e9d376f0 JB |
377 | char *first = words[i+1]; |
378 | char *last = strchr(first, '-'); | |
820874c7 | 379 | if (query->first_lineno || query->last_lineno) { |
18c216c5 | 380 | pr_err("match-spec: line used 2x\n"); |
820874c7 JC |
381 | return -EINVAL; |
382 | } | |
e9d376f0 JB |
383 | if (last) |
384 | *last++ = '\0'; | |
18c216c5 JC |
385 | if (parse_lineno(first, &query->first_lineno) < 0) { |
386 | pr_err("line-number is <0\n"); | |
e9d376f0 | 387 | return -EINVAL; |
18c216c5 | 388 | } |
820874c7 | 389 | if (last) { |
e9d376f0 | 390 | /* range <first>-<last> */ |
820874c7 JC |
391 | if (parse_lineno(last, &query->last_lineno) |
392 | < query->first_lineno) { | |
18c216c5 JC |
393 | pr_err("last-line:%d < 1st-line:%d\n", |
394 | query->last_lineno, | |
395 | query->first_lineno); | |
e9d376f0 | 396 | return -EINVAL; |
820874c7 | 397 | } |
e9d376f0 JB |
398 | } else { |
399 | query->last_lineno = query->first_lineno; | |
400 | } | |
401 | } else { | |
ae27f86a | 402 | pr_err("unknown keyword \"%s\"\n", words[i]); |
e9d376f0 JB |
403 | return -EINVAL; |
404 | } | |
820874c7 JC |
405 | if (rc) |
406 | return rc; | |
e9d376f0 | 407 | } |
574b3725 | 408 | vpr_info_dq(query, "parsed"); |
e9d376f0 JB |
409 | return 0; |
410 | } | |
411 | ||
412 | /* | |
413 | * Parse `str' as a flags specification, format [-+=][p]+. | |
414 | * Sets up *maskp and *flagsp to be used when changing the | |
415 | * flags fields of matched _ddebug's. Returns 0 on success | |
416 | * or <0 on error. | |
417 | */ | |
418 | static int ddebug_parse_flags(const char *str, unsigned int *flagsp, | |
419 | unsigned int *maskp) | |
420 | { | |
421 | unsigned flags = 0; | |
8ba6ebf5 | 422 | int op = '=', i; |
e9d376f0 JB |
423 | |
424 | switch (*str) { | |
425 | case '+': | |
426 | case '-': | |
427 | case '=': | |
428 | op = *str++; | |
429 | break; | |
430 | default: | |
18c216c5 | 431 | pr_err("bad flag-op %c, at start of %s\n", *str, str); |
e9d376f0 JB |
432 | return -EINVAL; |
433 | } | |
b8ccd5de | 434 | vpr_info("op='%c'\n", op); |
e9d376f0 | 435 | |
f657fd21 | 436 | for (; *str ; ++str) { |
8ba6ebf5 BVA |
437 | for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) { |
438 | if (*str == opt_array[i].opt_char) { | |
439 | flags |= opt_array[i].flag; | |
440 | break; | |
441 | } | |
e9d376f0 | 442 | } |
18c216c5 JC |
443 | if (i < 0) { |
444 | pr_err("unknown flag '%c' in \"%s\"\n", *str, str); | |
8ba6ebf5 | 445 | return -EINVAL; |
18c216c5 | 446 | } |
e9d376f0 | 447 | } |
b8ccd5de | 448 | vpr_info("flags=0x%x\n", flags); |
e9d376f0 JB |
449 | |
450 | /* calculate final *flagsp, *maskp according to mask and op */ | |
451 | switch (op) { | |
452 | case '=': | |
453 | *maskp = 0; | |
454 | *flagsp = flags; | |
455 | break; | |
456 | case '+': | |
457 | *maskp = ~0U; | |
458 | *flagsp = flags; | |
459 | break; | |
460 | case '-': | |
461 | *maskp = ~flags; | |
462 | *flagsp = 0; | |
463 | break; | |
464 | } | |
b8ccd5de | 465 | vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp); |
e9d376f0 JB |
466 | return 0; |
467 | } | |
468 | ||
8e59b5cf | 469 | static int ddebug_exec_query(char *query_string, const char *modname) |
fd89cfb8 TR |
470 | { |
471 | unsigned int flags = 0, mask = 0; | |
472 | struct ddebug_query query; | |
473 | #define MAXWORDS 9 | |
85f7f6c0 | 474 | int nwords, nfound; |
fd89cfb8 TR |
475 | char *words[MAXWORDS]; |
476 | ||
477 | nwords = ddebug_tokenize(query_string, words, MAXWORDS); | |
18c216c5 JC |
478 | if (nwords <= 0) { |
479 | pr_err("tokenize failed\n"); | |
fd89cfb8 | 480 | return -EINVAL; |
18c216c5 JC |
481 | } |
482 | /* check flags 1st (last arg) so query is pairs of spec,val */ | |
483 | if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) { | |
484 | pr_err("flags parse failed\n"); | |
fd89cfb8 | 485 | return -EINVAL; |
18c216c5 JC |
486 | } |
487 | if (ddebug_parse_query(words, nwords-1, &query, modname)) { | |
488 | pr_err("query parse failed\n"); | |
fd89cfb8 | 489 | return -EINVAL; |
18c216c5 | 490 | } |
fd89cfb8 | 491 | /* actually go and implement the change */ |
85f7f6c0 | 492 | nfound = ddebug_change(&query, flags, mask); |
f657fd21 | 493 | vpr_info_dq(&query, nfound ? "applied" : "no-match"); |
85f7f6c0 JC |
494 | |
495 | return nfound; | |
496 | } | |
497 | ||
498 | /* handle multiple queries in query string, continue on error, return | |
499 | last error or number of matching callsites. Module name is either | |
500 | in param (for boot arg) or perhaps in query string. | |
501 | */ | |
8e59b5cf | 502 | static int ddebug_exec_queries(char *query, const char *modname) |
85f7f6c0 JC |
503 | { |
504 | char *split; | |
505 | int i, errs = 0, exitcode = 0, rc, nfound = 0; | |
506 | ||
507 | for (i = 0; query; query = split) { | |
508 | split = strpbrk(query, ";\n"); | |
509 | if (split) | |
510 | *split++ = '\0'; | |
511 | ||
512 | query = skip_spaces(query); | |
513 | if (!query || !*query || *query == '#') | |
514 | continue; | |
515 | ||
b8ccd5de | 516 | vpr_info("query %d: \"%s\"\n", i, query); |
85f7f6c0 | 517 | |
8e59b5cf | 518 | rc = ddebug_exec_query(query, modname); |
85f7f6c0 JC |
519 | if (rc < 0) { |
520 | errs++; | |
521 | exitcode = rc; | |
f657fd21 | 522 | } else { |
85f7f6c0 | 523 | nfound += rc; |
f657fd21 | 524 | } |
85f7f6c0 JC |
525 | i++; |
526 | } | |
b8ccd5de | 527 | vpr_info("processed %d queries, with %d matches, %d errs\n", |
85f7f6c0 JC |
528 | i, nfound, errs); |
529 | ||
530 | if (exitcode) | |
531 | return exitcode; | |
532 | return nfound; | |
fd89cfb8 TR |
533 | } |
534 | ||
431625da JB |
535 | #define PREFIX_SIZE 64 |
536 | ||
537 | static int remaining(int wrote) | |
538 | { | |
539 | if (PREFIX_SIZE - wrote > 0) | |
540 | return PREFIX_SIZE - wrote; | |
541 | return 0; | |
542 | } | |
543 | ||
544 | static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf) | |
8ba6ebf5 | 545 | { |
431625da JB |
546 | int pos_after_tid; |
547 | int pos = 0; | |
8ba6ebf5 | 548 | |
798efc60 JP |
549 | *buf = '\0'; |
550 | ||
431625da | 551 | if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
8ba6ebf5 | 552 | if (in_interrupt()) |
798efc60 | 553 | pos += snprintf(buf + pos, remaining(pos), "<intr> "); |
8ba6ebf5 | 554 | else |
431625da | 555 | pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
798efc60 | 556 | task_pid_vnr(current)); |
8ba6ebf5 | 557 | } |
431625da JB |
558 | pos_after_tid = pos; |
559 | if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) | |
560 | pos += snprintf(buf + pos, remaining(pos), "%s:", | |
798efc60 | 561 | desc->modname); |
431625da JB |
562 | if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) |
563 | pos += snprintf(buf + pos, remaining(pos), "%s:", | |
798efc60 | 564 | desc->function); |
431625da | 565 | if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
07100be7 | 566 | pos += snprintf(buf + pos, remaining(pos), "%d:", |
798efc60 | 567 | desc->lineno); |
431625da JB |
568 | if (pos - pos_after_tid) |
569 | pos += snprintf(buf + pos, remaining(pos), " "); | |
570 | if (pos >= PREFIX_SIZE) | |
571 | buf[PREFIX_SIZE - 1] = '\0'; | |
6c2140ee | 572 | |
431625da | 573 | return buf; |
6c2140ee JP |
574 | } |
575 | ||
8ba6ebf5 BVA |
576 | int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
577 | { | |
578 | va_list args; | |
579 | int res; | |
431625da JB |
580 | struct va_format vaf; |
581 | char buf[PREFIX_SIZE]; | |
8ba6ebf5 BVA |
582 | |
583 | BUG_ON(!descriptor); | |
584 | BUG_ON(!fmt); | |
585 | ||
586 | va_start(args, fmt); | |
798efc60 | 587 | |
431625da JB |
588 | vaf.fmt = fmt; |
589 | vaf.va = &args; | |
798efc60 JP |
590 | |
591 | res = printk(KERN_DEBUG "%s%pV", | |
592 | dynamic_emit_prefix(descriptor, buf), &vaf); | |
593 | ||
8ba6ebf5 BVA |
594 | va_end(args); |
595 | ||
596 | return res; | |
597 | } | |
598 | EXPORT_SYMBOL(__dynamic_pr_debug); | |
599 | ||
cbc46635 JP |
600 | int __dynamic_dev_dbg(struct _ddebug *descriptor, |
601 | const struct device *dev, const char *fmt, ...) | |
602 | { | |
603 | struct va_format vaf; | |
604 | va_list args; | |
605 | int res; | |
606 | ||
607 | BUG_ON(!descriptor); | |
608 | BUG_ON(!fmt); | |
609 | ||
610 | va_start(args, fmt); | |
798efc60 | 611 | |
cbc46635 JP |
612 | vaf.fmt = fmt; |
613 | vaf.va = &args; | |
798efc60 JP |
614 | |
615 | if (!dev) { | |
616 | res = printk(KERN_DEBUG "(NULL device *): %pV", &vaf); | |
617 | } else { | |
618 | char buf[PREFIX_SIZE]; | |
798efc60 | 619 | |
666f355f JP |
620 | res = dev_printk_emit(7, dev, "%s%s %s: %pV", |
621 | dynamic_emit_prefix(descriptor, buf), | |
622 | dev_driver_string(dev), dev_name(dev), | |
623 | &vaf); | |
798efc60 JP |
624 | } |
625 | ||
cbc46635 JP |
626 | va_end(args); |
627 | ||
628 | return res; | |
629 | } | |
630 | EXPORT_SYMBOL(__dynamic_dev_dbg); | |
631 | ||
0feefd97 JB |
632 | #ifdef CONFIG_NET |
633 | ||
ffa10cb4 | 634 | int __dynamic_netdev_dbg(struct _ddebug *descriptor, |
b004ff49 | 635 | const struct net_device *dev, const char *fmt, ...) |
ffa10cb4 JB |
636 | { |
637 | struct va_format vaf; | |
638 | va_list args; | |
639 | int res; | |
640 | ||
641 | BUG_ON(!descriptor); | |
642 | BUG_ON(!fmt); | |
643 | ||
644 | va_start(args, fmt); | |
b004ff49 | 645 | |
ffa10cb4 JB |
646 | vaf.fmt = fmt; |
647 | vaf.va = &args; | |
b004ff49 JP |
648 | |
649 | if (dev && dev->dev.parent) { | |
650 | char buf[PREFIX_SIZE]; | |
666f355f JP |
651 | |
652 | res = dev_printk_emit(7, dev->dev.parent, | |
653 | "%s%s %s %s: %pV", | |
654 | dynamic_emit_prefix(descriptor, buf), | |
655 | dev_driver_string(dev->dev.parent), | |
656 | dev_name(dev->dev.parent), | |
657 | netdev_name(dev), &vaf); | |
b004ff49 JP |
658 | } else if (dev) { |
659 | res = printk(KERN_DEBUG "%s: %pV", netdev_name(dev), &vaf); | |
660 | } else { | |
661 | res = printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); | |
662 | } | |
663 | ||
ffa10cb4 JB |
664 | va_end(args); |
665 | ||
666 | return res; | |
667 | } | |
668 | EXPORT_SYMBOL(__dynamic_netdev_dbg); | |
669 | ||
0feefd97 JB |
670 | #endif |
671 | ||
bc757f6f JC |
672 | #define DDEBUG_STRING_SIZE 1024 |
673 | static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; | |
674 | ||
a648ec05 TR |
675 | static __init int ddebug_setup_query(char *str) |
676 | { | |
bc757f6f | 677 | if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5 | 678 | pr_warn("ddebug boot param string too large\n"); |
a648ec05 TR |
679 | return 0; |
680 | } | |
bc757f6f | 681 | strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05 TR |
682 | return 1; |
683 | } | |
684 | ||
685 | __setup("ddebug_query=", ddebug_setup_query); | |
686 | ||
e9d376f0 JB |
687 | /* |
688 | * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the | |
689 | * command text from userspace, parses and executes it. | |
690 | */ | |
7281491c | 691 | #define USER_BUF_PAGE 4096 |
e9d376f0 JB |
692 | static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, |
693 | size_t len, loff_t *offp) | |
694 | { | |
7281491c | 695 | char *tmpbuf; |
fd89cfb8 | 696 | int ret; |
e9d376f0 JB |
697 | |
698 | if (len == 0) | |
699 | return 0; | |
7281491c JC |
700 | if (len > USER_BUF_PAGE - 1) { |
701 | pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE); | |
e9d376f0 | 702 | return -E2BIG; |
7281491c JC |
703 | } |
704 | tmpbuf = kmalloc(len + 1, GFP_KERNEL); | |
705 | if (!tmpbuf) | |
706 | return -ENOMEM; | |
707 | if (copy_from_user(tmpbuf, ubuf, len)) { | |
708 | kfree(tmpbuf); | |
e9d376f0 | 709 | return -EFAULT; |
7281491c | 710 | } |
e9d376f0 | 711 | tmpbuf[len] = '\0'; |
b8ccd5de | 712 | vpr_info("read %d bytes from userspace\n", (int)len); |
e9d376f0 | 713 | |
8e59b5cf | 714 | ret = ddebug_exec_queries(tmpbuf, NULL); |
7281491c | 715 | kfree(tmpbuf); |
85f7f6c0 | 716 | if (ret < 0) |
fd89cfb8 | 717 | return ret; |
e9d376f0 JB |
718 | |
719 | *offp += len; | |
720 | return len; | |
721 | } | |
722 | ||
723 | /* | |
724 | * Set the iterator to point to the first _ddebug object | |
725 | * and return a pointer to that first object. Returns | |
726 | * NULL if there are no _ddebugs at all. | |
727 | */ | |
728 | static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter) | |
729 | { | |
730 | if (list_empty(&ddebug_tables)) { | |
731 | iter->table = NULL; | |
732 | iter->idx = 0; | |
733 | return NULL; | |
734 | } | |
735 | iter->table = list_entry(ddebug_tables.next, | |
736 | struct ddebug_table, link); | |
737 | iter->idx = 0; | |
738 | return &iter->table->ddebugs[iter->idx]; | |
739 | } | |
740 | ||
741 | /* | |
742 | * Advance the iterator to point to the next _ddebug | |
743 | * object from the one the iterator currently points at, | |
744 | * and returns a pointer to the new _ddebug. Returns | |
745 | * NULL if the iterator has seen all the _ddebugs. | |
746 | */ | |
747 | static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter) | |
748 | { | |
749 | if (iter->table == NULL) | |
750 | return NULL; | |
751 | if (++iter->idx == iter->table->num_ddebugs) { | |
752 | /* iterate to next table */ | |
753 | iter->idx = 0; | |
754 | if (list_is_last(&iter->table->link, &ddebug_tables)) { | |
755 | iter->table = NULL; | |
756 | return NULL; | |
757 | } | |
758 | iter->table = list_entry(iter->table->link.next, | |
759 | struct ddebug_table, link); | |
760 | } | |
761 | return &iter->table->ddebugs[iter->idx]; | |
762 | } | |
763 | ||
764 | /* | |
765 | * Seq_ops start method. Called at the start of every | |
766 | * read() call from userspace. Takes the ddebug_lock and | |
767 | * seeks the seq_file's iterator to the given position. | |
768 | */ | |
769 | static void *ddebug_proc_start(struct seq_file *m, loff_t *pos) | |
770 | { | |
771 | struct ddebug_iter *iter = m->private; | |
772 | struct _ddebug *dp; | |
773 | int n = *pos; | |
774 | ||
b8ccd5de | 775 | vpr_info("called m=%p *pos=%lld\n", m, (unsigned long long)*pos); |
e9d376f0 JB |
776 | |
777 | mutex_lock(&ddebug_lock); | |
778 | ||
779 | if (!n) | |
780 | return SEQ_START_TOKEN; | |
781 | if (n < 0) | |
782 | return NULL; | |
783 | dp = ddebug_iter_first(iter); | |
784 | while (dp != NULL && --n > 0) | |
785 | dp = ddebug_iter_next(iter); | |
786 | return dp; | |
787 | } | |
788 | ||
789 | /* | |
790 | * Seq_ops next method. Called several times within a read() | |
791 | * call from userspace, with ddebug_lock held. Walks to the | |
792 | * next _ddebug object with a special case for the header line. | |
793 | */ | |
794 | static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos) | |
795 | { | |
796 | struct ddebug_iter *iter = m->private; | |
797 | struct _ddebug *dp; | |
798 | ||
b8ccd5de | 799 | vpr_info("called m=%p p=%p *pos=%lld\n", |
f657fd21 | 800 | m, p, (unsigned long long)*pos); |
e9d376f0 JB |
801 | |
802 | if (p == SEQ_START_TOKEN) | |
803 | dp = ddebug_iter_first(iter); | |
804 | else | |
805 | dp = ddebug_iter_next(iter); | |
806 | ++*pos; | |
807 | return dp; | |
808 | } | |
809 | ||
810 | /* | |
811 | * Seq_ops show method. Called several times within a read() | |
812 | * call from userspace, with ddebug_lock held. Formats the | |
813 | * current _ddebug as a single human-readable line, with a | |
814 | * special case for the header line. | |
815 | */ | |
816 | static int ddebug_proc_show(struct seq_file *m, void *p) | |
817 | { | |
818 | struct ddebug_iter *iter = m->private; | |
819 | struct _ddebug *dp = p; | |
5ca7d2a6 | 820 | char flagsbuf[10]; |
e9d376f0 | 821 | |
b8ccd5de | 822 | vpr_info("called m=%p p=%p\n", m, p); |
e9d376f0 JB |
823 | |
824 | if (p == SEQ_START_TOKEN) { | |
825 | seq_puts(m, | |
f657fd21 | 826 | "# filename:lineno [module]function flags format\n"); |
e9d376f0 JB |
827 | return 0; |
828 | } | |
829 | ||
5ca7d2a6 | 830 | seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21 JP |
831 | trim_prefix(dp->filename), dp->lineno, |
832 | iter->table->mod_name, dp->function, | |
833 | ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf))); | |
e9d376f0 JB |
834 | seq_escape(m, dp->format, "\t\r\n\""); |
835 | seq_puts(m, "\"\n"); | |
836 | ||
837 | return 0; | |
838 | } | |
839 | ||
840 | /* | |
841 | * Seq_ops stop method. Called at the end of each read() | |
842 | * call from userspace. Drops ddebug_lock. | |
843 | */ | |
844 | static void ddebug_proc_stop(struct seq_file *m, void *p) | |
845 | { | |
b8ccd5de | 846 | vpr_info("called m=%p p=%p\n", m, p); |
e9d376f0 JB |
847 | mutex_unlock(&ddebug_lock); |
848 | } | |
849 | ||
850 | static const struct seq_operations ddebug_proc_seqops = { | |
851 | .start = ddebug_proc_start, | |
852 | .next = ddebug_proc_next, | |
853 | .show = ddebug_proc_show, | |
854 | .stop = ddebug_proc_stop | |
855 | }; | |
856 | ||
857 | /* | |
07100be7 JC |
858 | * File_ops->open method for <debugfs>/dynamic_debug/control. Does |
859 | * the seq_file setup dance, and also creates an iterator to walk the | |
860 | * _ddebugs. Note that we create a seq_file always, even for O_WRONLY | |
861 | * files where it's not needed, as doing so simplifies the ->release | |
862 | * method. | |
e9d376f0 JB |
863 | */ |
864 | static int ddebug_proc_open(struct inode *inode, struct file *file) | |
865 | { | |
866 | struct ddebug_iter *iter; | |
867 | int err; | |
868 | ||
b8ccd5de | 869 | vpr_info("called\n"); |
e9d376f0 JB |
870 | |
871 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
872 | if (iter == NULL) | |
873 | return -ENOMEM; | |
874 | ||
875 | err = seq_open(file, &ddebug_proc_seqops); | |
876 | if (err) { | |
877 | kfree(iter); | |
878 | return err; | |
879 | } | |
f657fd21 | 880 | ((struct seq_file *)file->private_data)->private = iter; |
e9d376f0 JB |
881 | return 0; |
882 | } | |
883 | ||
884 | static const struct file_operations ddebug_proc_fops = { | |
885 | .owner = THIS_MODULE, | |
886 | .open = ddebug_proc_open, | |
887 | .read = seq_read, | |
888 | .llseek = seq_lseek, | |
889 | .release = seq_release_private, | |
890 | .write = ddebug_proc_write | |
891 | }; | |
892 | ||
893 | /* | |
894 | * Allocate a new ddebug_table for the given module | |
895 | * and add it to the global list. | |
896 | */ | |
897 | int ddebug_add_module(struct _ddebug *tab, unsigned int n, | |
898 | const char *name) | |
899 | { | |
900 | struct ddebug_table *dt; | |
901 | char *new_name; | |
902 | ||
903 | dt = kzalloc(sizeof(*dt), GFP_KERNEL); | |
904 | if (dt == NULL) | |
905 | return -ENOMEM; | |
906 | new_name = kstrdup(name, GFP_KERNEL); | |
907 | if (new_name == NULL) { | |
908 | kfree(dt); | |
909 | return -ENOMEM; | |
910 | } | |
911 | dt->mod_name = new_name; | |
912 | dt->num_ddebugs = n; | |
e9d376f0 JB |
913 | dt->ddebugs = tab; |
914 | ||
915 | mutex_lock(&ddebug_lock); | |
916 | list_add_tail(&dt->link, &ddebug_tables); | |
917 | mutex_unlock(&ddebug_lock); | |
918 | ||
b8ccd5de | 919 | vpr_info("%u debug prints in module %s\n", n, dt->mod_name); |
e9d376f0 JB |
920 | return 0; |
921 | } | |
922 | EXPORT_SYMBOL_GPL(ddebug_add_module); | |
923 | ||
6ab676e9 JC |
924 | /* helper for ddebug_dyndbg_(boot|module)_param_cb */ |
925 | static int ddebug_dyndbg_param_cb(char *param, char *val, | |
926 | const char *modname, int on_err) | |
b48420c1 | 927 | { |
b48420c1 JC |
928 | char *sep; |
929 | ||
930 | sep = strchr(param, '.'); | |
931 | if (sep) { | |
6ab676e9 | 932 | /* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1 JC |
933 | *sep = '\0'; |
934 | modname = param; | |
935 | param = sep + 1; | |
936 | } | |
937 | if (strcmp(param, "dyndbg")) | |
6ab676e9 | 938 | return on_err; /* determined by caller */ |
b48420c1 | 939 | |
8e59b5cf JC |
940 | ddebug_exec_queries((val ? val : "+p"), modname); |
941 | ||
b48420c1 JC |
942 | return 0; /* query failure shouldnt stop module load */ |
943 | } | |
944 | ||
6ab676e9 JC |
945 | /* handle both dyndbg and $module.dyndbg params at boot */ |
946 | static int ddebug_dyndbg_boot_param_cb(char *param, char *val, | |
947 | const char *unused) | |
b48420c1 | 948 | { |
6ab676e9 JC |
949 | vpr_info("%s=\"%s\"\n", param, val); |
950 | return ddebug_dyndbg_param_cb(param, val, NULL, 0); | |
951 | } | |
b48420c1 | 952 | |
6ab676e9 JC |
953 | /* |
954 | * modprobe foo finds foo.params in boot-args, strips "foo.", and | |
955 | * passes them to load_module(). This callback gets unknown params, | |
956 | * processes dyndbg params, rejects others. | |
957 | */ | |
958 | int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module) | |
959 | { | |
960 | vpr_info("module: %s %s=\"%s\"\n", module, param, val); | |
961 | return ddebug_dyndbg_param_cb(param, val, module, -ENOENT); | |
b48420c1 JC |
962 | } |
963 | ||
e9d376f0 JB |
964 | static void ddebug_table_free(struct ddebug_table *dt) |
965 | { | |
966 | list_del_init(&dt->link); | |
967 | kfree(dt->mod_name); | |
968 | kfree(dt); | |
969 | } | |
970 | ||
971 | /* | |
972 | * Called in response to a module being unloaded. Removes | |
973 | * any ddebug_table's which point at the module. | |
974 | */ | |
ff49d74a | 975 | int ddebug_remove_module(const char *mod_name) |
e9d376f0 JB |
976 | { |
977 | struct ddebug_table *dt, *nextdt; | |
978 | int ret = -ENOENT; | |
979 | ||
b8ccd5de | 980 | vpr_info("removing module \"%s\"\n", mod_name); |
e9d376f0 JB |
981 | |
982 | mutex_lock(&ddebug_lock); | |
983 | list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) { | |
984 | if (!strcmp(dt->mod_name, mod_name)) { | |
985 | ddebug_table_free(dt); | |
986 | ret = 0; | |
987 | } | |
988 | } | |
989 | mutex_unlock(&ddebug_lock); | |
990 | return ret; | |
991 | } | |
992 | EXPORT_SYMBOL_GPL(ddebug_remove_module); | |
993 | ||
994 | static void ddebug_remove_all_tables(void) | |
995 | { | |
996 | mutex_lock(&ddebug_lock); | |
997 | while (!list_empty(&ddebug_tables)) { | |
998 | struct ddebug_table *dt = list_entry(ddebug_tables.next, | |
999 | struct ddebug_table, | |
1000 | link); | |
1001 | ddebug_table_free(dt); | |
1002 | } | |
1003 | mutex_unlock(&ddebug_lock); | |
1004 | } | |
1005 | ||
6a5c083d TR |
1006 | static __initdata int ddebug_init_success; |
1007 | ||
1008 | static int __init dynamic_debug_init_debugfs(void) | |
e9d376f0 JB |
1009 | { |
1010 | struct dentry *dir, *file; | |
6a5c083d TR |
1011 | |
1012 | if (!ddebug_init_success) | |
1013 | return -ENODEV; | |
e9d376f0 JB |
1014 | |
1015 | dir = debugfs_create_dir("dynamic_debug", NULL); | |
1016 | if (!dir) | |
1017 | return -ENOMEM; | |
1018 | file = debugfs_create_file("control", 0644, dir, NULL, | |
1019 | &ddebug_proc_fops); | |
1020 | if (!file) { | |
1021 | debugfs_remove(dir); | |
1022 | return -ENOMEM; | |
1023 | } | |
6a5c083d TR |
1024 | return 0; |
1025 | } | |
1026 | ||
1027 | static int __init dynamic_debug_init(void) | |
1028 | { | |
1029 | struct _ddebug *iter, *iter_start; | |
1030 | const char *modname = NULL; | |
b48420c1 | 1031 | char *cmdline; |
6a5c083d | 1032 | int ret = 0; |
41076927 JC |
1033 | int n = 0, entries = 0, modct = 0; |
1034 | int verbose_bytes = 0; | |
6a5c083d | 1035 | |
b5b78f83 | 1036 | if (__start___verbose == __stop___verbose) { |
f657fd21 | 1037 | pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n"); |
b5b78f83 JC |
1038 | return 1; |
1039 | } | |
1040 | iter = __start___verbose; | |
1041 | modname = iter->modname; | |
1042 | iter_start = iter; | |
1043 | for (; iter < __stop___verbose; iter++) { | |
41076927 JC |
1044 | entries++; |
1045 | verbose_bytes += strlen(iter->modname) + strlen(iter->function) | |
1046 | + strlen(iter->filename) + strlen(iter->format); | |
1047 | ||
b5b78f83 | 1048 | if (strcmp(modname, iter->modname)) { |
41076927 | 1049 | modct++; |
b5b78f83 JC |
1050 | ret = ddebug_add_module(iter_start, n, modname); |
1051 | if (ret) | |
af442399 | 1052 | goto out_err; |
b5b78f83 JC |
1053 | n = 0; |
1054 | modname = iter->modname; | |
1055 | iter_start = iter; | |
e9d376f0 | 1056 | } |
b5b78f83 | 1057 | n++; |
e9d376f0 | 1058 | } |
b5b78f83 JC |
1059 | ret = ddebug_add_module(iter_start, n, modname); |
1060 | if (ret) | |
af442399 | 1061 | goto out_err; |
a648ec05 | 1062 | |
af442399 | 1063 | ddebug_init_success = 1; |
f657fd21 JP |
1064 | vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in (readonly) verbose section\n", |
1065 | modct, entries, (int)(modct * sizeof(struct ddebug_table)), | |
1066 | verbose_bytes + (int)(__stop___verbose - __start___verbose)); | |
af442399 JC |
1067 | |
1068 | /* apply ddebug_query boot param, dont unload tables on err */ | |
a648ec05 | 1069 | if (ddebug_setup_string[0] != '\0') { |
f657fd21 | 1070 | pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n"); |
8e59b5cf | 1071 | ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0 | 1072 | if (ret < 0) |
f657fd21 | 1073 | pr_warn("Invalid ddebug boot param %s\n", |
4ad275e5 | 1074 | ddebug_setup_string); |
a648ec05 | 1075 | else |
85f7f6c0 | 1076 | pr_info("%d changes by ddebug_query\n", ret); |
a648ec05 | 1077 | } |
b48420c1 JC |
1078 | /* now that ddebug tables are loaded, process all boot args |
1079 | * again to find and activate queries given in dyndbg params. | |
1080 | * While this has already been done for known boot params, it | |
1081 | * ignored the unknown ones (dyndbg in particular). Reusing | |
1082 | * parse_args avoids ad-hoc parsing. This will also attempt | |
1083 | * to activate queries for not-yet-loaded modules, which is | |
1084 | * slightly noisy if verbose, but harmless. | |
1085 | */ | |
1086 | cmdline = kstrdup(saved_command_line, GFP_KERNEL); | |
1087 | parse_args("dyndbg params", cmdline, NULL, | |
1088 | 0, 0, 0, &ddebug_dyndbg_boot_param_cb); | |
1089 | kfree(cmdline); | |
af442399 | 1090 | return 0; |
a648ec05 | 1091 | |
af442399 JC |
1092 | out_err: |
1093 | ddebug_remove_all_tables(); | |
e9d376f0 JB |
1094 | return 0; |
1095 | } | |
6a5c083d | 1096 | /* Allow early initialization for boot messages via boot param */ |
3ec5652a | 1097 | early_initcall(dynamic_debug_init); |
b48420c1 | 1098 | |
6a5c083d | 1099 | /* Debugfs setup must be done later */ |
3ec5652a | 1100 | fs_initcall(dynamic_debug_init_debugfs); |