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. |
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 | 39 | |
923abb9d GP |
40 | #include <rdma/ib_verbs.h> |
41 | ||
e5ebffe1 JC |
42 | extern struct _ddebug __start___dyndbg[]; |
43 | extern struct _ddebug __stop___dyndbg[]; | |
e9d376f0 | 44 | |
e9d376f0 JB |
45 | struct ddebug_table { |
46 | struct list_head link; | |
3e406b1d | 47 | const char *mod_name; |
e9d376f0 | 48 | unsigned int num_ddebugs; |
e9d376f0 JB |
49 | struct _ddebug *ddebugs; |
50 | }; | |
51 | ||
52 | struct ddebug_query { | |
53 | const char *filename; | |
54 | const char *module; | |
55 | const char *function; | |
56 | const char *format; | |
57 | unsigned int first_lineno, last_lineno; | |
58 | }; | |
59 | ||
60 | struct ddebug_iter { | |
61 | struct ddebug_table *table; | |
62 | unsigned int idx; | |
63 | }; | |
64 | ||
65 | static DEFINE_MUTEX(ddebug_lock); | |
66 | static LIST_HEAD(ddebug_tables); | |
f657fd21 | 67 | static int verbose; |
74df138d | 68 | module_param(verbose, int, 0644); |
e9d376f0 | 69 | |
2b678319 JC |
70 | /* Return the path relative to source root */ |
71 | static inline const char *trim_prefix(const char *path) | |
72 | { | |
73 | int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c"); | |
74 | ||
75 | if (strncmp(path, __FILE__, skip)) | |
76 | skip = 0; /* prefix mismatch, don't skip */ | |
77 | ||
78 | return path + skip; | |
79 | } | |
80 | ||
8ba6ebf5 BVA |
81 | static struct { unsigned flag:8; char opt_char; } opt_array[] = { |
82 | { _DPRINTK_FLAGS_PRINT, 'p' }, | |
83 | { _DPRINTK_FLAGS_INCL_MODNAME, 'm' }, | |
84 | { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' }, | |
85 | { _DPRINTK_FLAGS_INCL_LINENO, 'l' }, | |
86 | { _DPRINTK_FLAGS_INCL_TID, 't' }, | |
5ca7d2a6 | 87 | { _DPRINTK_FLAGS_NONE, '_' }, |
8ba6ebf5 BVA |
88 | }; |
89 | ||
f678ce8c JC |
90 | struct flagsbuf { char buf[ARRAY_SIZE(opt_array)+1]; }; |
91 | ||
e9d376f0 | 92 | /* format a string into buf[] which describes the _ddebug's flags */ |
f678ce8c | 93 | static char *ddebug_describe_flags(unsigned int flags, struct flagsbuf *fb) |
e9d376f0 | 94 | { |
f678ce8c | 95 | char *p = fb->buf; |
8ba6ebf5 | 96 | int i; |
e9d376f0 | 97 | |
8ba6ebf5 | 98 | for (i = 0; i < ARRAY_SIZE(opt_array); ++i) |
f678ce8c | 99 | if (flags & opt_array[i].flag) |
8ba6ebf5 | 100 | *p++ = opt_array[i].opt_char; |
f678ce8c | 101 | if (p == fb->buf) |
5ca7d2a6 | 102 | *p++ = '_'; |
e9d376f0 JB |
103 | *p = '\0'; |
104 | ||
f678ce8c | 105 | return fb->buf; |
e9d376f0 JB |
106 | } |
107 | ||
481c0e33 | 108 | #define vnpr_info(lvl, fmt, ...) \ |
b8ccd5de | 109 | do { \ |
481c0e33 | 110 | if (verbose >= lvl) \ |
f657fd21 | 111 | pr_info(fmt, ##__VA_ARGS__); \ |
574b3725 JC |
112 | } while (0) |
113 | ||
481c0e33 JC |
114 | #define vpr_info(fmt, ...) vnpr_info(1, fmt, ##__VA_ARGS__) |
115 | #define v2pr_info(fmt, ...) vnpr_info(2, fmt, ##__VA_ARGS__) | |
116 | ||
f657fd21 JP |
117 | static void vpr_info_dq(const struct ddebug_query *query, const char *msg) |
118 | { | |
119 | /* trim any trailing newlines */ | |
120 | int fmtlen = 0; | |
121 | ||
122 | if (query->format) { | |
123 | fmtlen = strlen(query->format); | |
124 | while (fmtlen && query->format[fmtlen - 1] == '\n') | |
125 | fmtlen--; | |
126 | } | |
127 | ||
128 | vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n", | |
129 | msg, | |
130 | query->function ? query->function : "", | |
131 | query->filename ? query->filename : "", | |
132 | query->module ? query->module : "", | |
133 | fmtlen, query->format ? query->format : "", | |
134 | query->first_lineno, query->last_lineno); | |
135 | } | |
136 | ||
e9d376f0 | 137 | /* |
85f7f6c0 JC |
138 | * Search the tables for _ddebug's which match the given `query' and |
139 | * apply the `flags' and `mask' to them. Returns number of matching | |
140 | * callsites, normally the same as number of changes. If verbose, | |
141 | * logs the changes. Takes ddebug_lock. | |
e9d376f0 | 142 | */ |
85f7f6c0 JC |
143 | static int ddebug_change(const struct ddebug_query *query, |
144 | unsigned int flags, unsigned int mask) | |
e9d376f0 JB |
145 | { |
146 | int i; | |
147 | struct ddebug_table *dt; | |
148 | unsigned int newflags; | |
149 | unsigned int nfound = 0; | |
f678ce8c | 150 | struct flagsbuf fbuf; |
e9d376f0 JB |
151 | |
152 | /* search for matching ddebugs */ | |
153 | mutex_lock(&ddebug_lock); | |
154 | list_for_each_entry(dt, &ddebug_tables, link) { | |
155 | ||
156 | /* match against the module name */ | |
578b1e07 DC |
157 | if (query->module && |
158 | !match_wildcard(query->module, dt->mod_name)) | |
e9d376f0 JB |
159 | continue; |
160 | ||
f657fd21 | 161 | for (i = 0; i < dt->num_ddebugs; i++) { |
e9d376f0 JB |
162 | struct _ddebug *dp = &dt->ddebugs[i]; |
163 | ||
164 | /* match against the source filename */ | |
d6a238d2 | 165 | if (query->filename && |
578b1e07 DC |
166 | !match_wildcard(query->filename, dp->filename) && |
167 | !match_wildcard(query->filename, | |
168 | kbasename(dp->filename)) && | |
169 | !match_wildcard(query->filename, | |
170 | trim_prefix(dp->filename))) | |
e9d376f0 JB |
171 | continue; |
172 | ||
173 | /* match against the function */ | |
d6a238d2 | 174 | if (query->function && |
578b1e07 | 175 | !match_wildcard(query->function, dp->function)) |
e9d376f0 JB |
176 | continue; |
177 | ||
178 | /* match against the format */ | |
d6a238d2 JC |
179 | if (query->format && |
180 | !strstr(dp->format, query->format)) | |
e9d376f0 JB |
181 | continue; |
182 | ||
183 | /* match against the line number range */ | |
184 | if (query->first_lineno && | |
185 | dp->lineno < query->first_lineno) | |
186 | continue; | |
187 | if (query->last_lineno && | |
188 | dp->lineno > query->last_lineno) | |
189 | continue; | |
190 | ||
191 | nfound++; | |
192 | ||
193 | newflags = (dp->flags & mask) | flags; | |
194 | if (newflags == dp->flags) | |
195 | continue; | |
e9666d10 | 196 | #ifdef CONFIG_JUMP_LABEL |
9049fc74 JB |
197 | if (dp->flags & _DPRINTK_FLAGS_PRINT) { |
198 | if (!(flags & _DPRINTK_FLAGS_PRINT)) | |
199 | static_branch_disable(&dp->key.dd_key_true); | |
200 | } else if (flags & _DPRINTK_FLAGS_PRINT) | |
201 | static_branch_enable(&dp->key.dd_key_true); | |
202 | #endif | |
e9d376f0 | 203 | dp->flags = newflags; |
481c0e33 | 204 | v2pr_info("changed %s:%d [%s]%s =%s\n", |
f657fd21 JP |
205 | trim_prefix(dp->filename), dp->lineno, |
206 | dt->mod_name, dp->function, | |
f678ce8c | 207 | ddebug_describe_flags(dp->flags, &fbuf)); |
e9d376f0 JB |
208 | } |
209 | } | |
210 | mutex_unlock(&ddebug_lock); | |
211 | ||
212 | if (!nfound && verbose) | |
4ad275e5 | 213 | pr_info("no matches for query\n"); |
85f7f6c0 JC |
214 | |
215 | return nfound; | |
e9d376f0 JB |
216 | } |
217 | ||
e9d376f0 JB |
218 | /* |
219 | * Split the buffer `buf' into space-separated words. | |
9898abb3 GB |
220 | * Handles simple " and ' quoting, i.e. without nested, |
221 | * embedded or escaped \". Return the number of words | |
222 | * or <0 on error. | |
e9d376f0 JB |
223 | */ |
224 | static int ddebug_tokenize(char *buf, char *words[], int maxwords) | |
225 | { | |
226 | int nwords = 0; | |
227 | ||
9898abb3 GB |
228 | while (*buf) { |
229 | char *end; | |
230 | ||
231 | /* Skip leading whitespace */ | |
e7d2860b | 232 | buf = skip_spaces(buf); |
9898abb3 GB |
233 | if (!*buf) |
234 | break; /* oh, it was trailing whitespace */ | |
8bd6026e JC |
235 | if (*buf == '#') |
236 | break; /* token starts comment, skip rest of line */ | |
9898abb3 | 237 | |
07100be7 | 238 | /* find `end' of word, whitespace separated or quoted */ |
9898abb3 GB |
239 | if (*buf == '"' || *buf == '\'') { |
240 | int quote = *buf++; | |
f657fd21 | 241 | for (end = buf; *end && *end != quote; end++) |
9898abb3 | 242 | ; |
18c216c5 JC |
243 | if (!*end) { |
244 | pr_err("unclosed quote: %s\n", buf); | |
9898abb3 | 245 | return -EINVAL; /* unclosed quote */ |
18c216c5 | 246 | } |
9898abb3 | 247 | } else { |
f657fd21 | 248 | for (end = buf; *end && !isspace(*end); end++) |
9898abb3 GB |
249 | ; |
250 | BUG_ON(end == buf); | |
251 | } | |
9898abb3 | 252 | |
07100be7 | 253 | /* `buf' is start of word, `end' is one past its end */ |
18c216c5 JC |
254 | if (nwords == maxwords) { |
255 | pr_err("too many words, legal max <=%d\n", maxwords); | |
9898abb3 | 256 | return -EINVAL; /* ran out of words[] before bytes */ |
18c216c5 | 257 | } |
9898abb3 GB |
258 | if (*end) |
259 | *end++ = '\0'; /* terminate the word */ | |
260 | words[nwords++] = buf; | |
261 | buf = end; | |
262 | } | |
e9d376f0 JB |
263 | |
264 | if (verbose) { | |
265 | int i; | |
4ad275e5 | 266 | pr_info("split into words:"); |
f657fd21 | 267 | for (i = 0; i < nwords; i++) |
4ad275e5 JP |
268 | pr_cont(" \"%s\"", words[i]); |
269 | pr_cont("\n"); | |
e9d376f0 JB |
270 | } |
271 | ||
272 | return nwords; | |
273 | } | |
274 | ||
275 | /* | |
276 | * Parse a single line number. Note that the empty string "" | |
277 | * is treated as a special case and converted to zero, which | |
278 | * is later treated as a "don't care" value. | |
279 | */ | |
280 | static inline int parse_lineno(const char *str, unsigned int *val) | |
281 | { | |
e9d376f0 JB |
282 | BUG_ON(str == NULL); |
283 | if (*str == '\0') { | |
284 | *val = 0; | |
285 | return 0; | |
286 | } | |
4592599a | 287 | if (kstrtouint(str, 10, val) < 0) { |
18c216c5 JC |
288 | pr_err("bad line-number: %s\n", str); |
289 | return -EINVAL; | |
290 | } | |
291 | return 0; | |
e9d376f0 JB |
292 | } |
293 | ||
820874c7 JC |
294 | static int check_set(const char **dest, char *src, char *name) |
295 | { | |
296 | int rc = 0; | |
297 | ||
298 | if (*dest) { | |
299 | rc = -EINVAL; | |
f657fd21 JP |
300 | pr_err("match-spec:%s val:%s overridden by %s\n", |
301 | name, *dest, src); | |
820874c7 JC |
302 | } |
303 | *dest = src; | |
304 | return rc; | |
305 | } | |
306 | ||
e9d376f0 JB |
307 | /* |
308 | * Parse words[] as a ddebug query specification, which is a series | |
309 | * of (keyword, value) pairs chosen from these possibilities: | |
310 | * | |
311 | * func <function-name> | |
312 | * file <full-pathname> | |
313 | * file <base-filename> | |
314 | * module <module-name> | |
315 | * format <escaped-string-to-find-in-format> | |
316 | * line <lineno> | |
317 | * line <first-lineno>-<last-lineno> // where either may be empty | |
820874c7 JC |
318 | * |
319 | * Only 1 of each type is allowed. | |
320 | * Returns 0 on success, <0 on error. | |
e9d376f0 JB |
321 | */ |
322 | static int ddebug_parse_query(char *words[], int nwords, | |
8e59b5cf | 323 | struct ddebug_query *query, const char *modname) |
e9d376f0 JB |
324 | { |
325 | unsigned int i; | |
bd8c154a | 326 | int rc = 0; |
e9d376f0 JB |
327 | |
328 | /* check we have an even number of words */ | |
18c216c5 JC |
329 | if (nwords % 2 != 0) { |
330 | pr_err("expecting pairs of match-spec <value>\n"); | |
e9d376f0 | 331 | return -EINVAL; |
18c216c5 | 332 | } |
e9d376f0 | 333 | |
8e59b5cf JC |
334 | if (modname) |
335 | /* support $modname.dyndbg=<multiple queries> */ | |
336 | query->module = modname; | |
337 | ||
f657fd21 JP |
338 | for (i = 0; i < nwords; i += 2) { |
339 | if (!strcmp(words[i], "func")) { | |
820874c7 | 340 | rc = check_set(&query->function, words[i+1], "func"); |
f657fd21 | 341 | } else if (!strcmp(words[i], "file")) { |
820874c7 | 342 | rc = check_set(&query->filename, words[i+1], "file"); |
f657fd21 | 343 | } else if (!strcmp(words[i], "module")) { |
820874c7 | 344 | rc = check_set(&query->module, words[i+1], "module"); |
f657fd21 | 345 | } else if (!strcmp(words[i], "format")) { |
d338b137 AS |
346 | string_unescape_inplace(words[i+1], UNESCAPE_SPACE | |
347 | UNESCAPE_OCTAL | | |
348 | UNESCAPE_SPECIAL); | |
349 | rc = check_set(&query->format, words[i+1], "format"); | |
f657fd21 | 350 | } else if (!strcmp(words[i], "line")) { |
e9d376f0 JB |
351 | char *first = words[i+1]; |
352 | char *last = strchr(first, '-'); | |
820874c7 | 353 | if (query->first_lineno || query->last_lineno) { |
18c216c5 | 354 | pr_err("match-spec: line used 2x\n"); |
820874c7 JC |
355 | return -EINVAL; |
356 | } | |
e9d376f0 JB |
357 | if (last) |
358 | *last++ = '\0'; | |
d9e133e6 | 359 | if (parse_lineno(first, &query->first_lineno) < 0) |
e9d376f0 | 360 | return -EINVAL; |
820874c7 | 361 | if (last) { |
e9d376f0 | 362 | /* range <first>-<last> */ |
3ace678f AR |
363 | if (parse_lineno(last, &query->last_lineno) < 0) |
364 | return -EINVAL; | |
365 | ||
1f3c790b RD |
366 | /* special case for last lineno not specified */ |
367 | if (query->last_lineno == 0) | |
368 | query->last_lineno = UINT_MAX; | |
369 | ||
3ace678f | 370 | if (query->last_lineno < query->first_lineno) { |
18c216c5 JC |
371 | pr_err("last-line:%d < 1st-line:%d\n", |
372 | query->last_lineno, | |
373 | query->first_lineno); | |
e9d376f0 | 374 | return -EINVAL; |
820874c7 | 375 | } |
e9d376f0 JB |
376 | } else { |
377 | query->last_lineno = query->first_lineno; | |
378 | } | |
379 | } else { | |
ae27f86a | 380 | pr_err("unknown keyword \"%s\"\n", words[i]); |
e9d376f0 JB |
381 | return -EINVAL; |
382 | } | |
820874c7 JC |
383 | if (rc) |
384 | return rc; | |
e9d376f0 | 385 | } |
574b3725 | 386 | vpr_info_dq(query, "parsed"); |
e9d376f0 JB |
387 | return 0; |
388 | } | |
389 | ||
390 | /* | |
391 | * Parse `str' as a flags specification, format [-+=][p]+. | |
392 | * Sets up *maskp and *flagsp to be used when changing the | |
393 | * flags fields of matched _ddebug's. Returns 0 on success | |
394 | * or <0 on error. | |
395 | */ | |
396 | static int ddebug_parse_flags(const char *str, unsigned int *flagsp, | |
397 | unsigned int *maskp) | |
398 | { | |
399 | unsigned flags = 0; | |
8ba6ebf5 | 400 | int op = '=', i; |
e9d376f0 JB |
401 | |
402 | switch (*str) { | |
403 | case '+': | |
404 | case '-': | |
405 | case '=': | |
406 | op = *str++; | |
407 | break; | |
408 | default: | |
18c216c5 | 409 | pr_err("bad flag-op %c, at start of %s\n", *str, str); |
e9d376f0 JB |
410 | return -EINVAL; |
411 | } | |
b8ccd5de | 412 | vpr_info("op='%c'\n", op); |
e9d376f0 | 413 | |
f657fd21 | 414 | for (; *str ; ++str) { |
8ba6ebf5 BVA |
415 | for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) { |
416 | if (*str == opt_array[i].opt_char) { | |
417 | flags |= opt_array[i].flag; | |
418 | break; | |
419 | } | |
e9d376f0 | 420 | } |
18c216c5 | 421 | if (i < 0) { |
0b8f96be | 422 | pr_err("unknown flag '%c'\n", *str); |
8ba6ebf5 | 423 | return -EINVAL; |
18c216c5 | 424 | } |
e9d376f0 | 425 | } |
b8ccd5de | 426 | vpr_info("flags=0x%x\n", flags); |
e9d376f0 JB |
427 | |
428 | /* calculate final *flagsp, *maskp according to mask and op */ | |
429 | switch (op) { | |
430 | case '=': | |
431 | *maskp = 0; | |
432 | *flagsp = flags; | |
433 | break; | |
434 | case '+': | |
435 | *maskp = ~0U; | |
436 | *flagsp = flags; | |
437 | break; | |
438 | case '-': | |
439 | *maskp = ~flags; | |
440 | *flagsp = 0; | |
441 | break; | |
442 | } | |
b8ccd5de | 443 | vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp); |
e9d376f0 JB |
444 | return 0; |
445 | } | |
446 | ||
8e59b5cf | 447 | static int ddebug_exec_query(char *query_string, const char *modname) |
fd89cfb8 TR |
448 | { |
449 | unsigned int flags = 0, mask = 0; | |
9c9d0acb | 450 | struct ddebug_query query = {}; |
fd89cfb8 | 451 | #define MAXWORDS 9 |
85f7f6c0 | 452 | int nwords, nfound; |
fd89cfb8 TR |
453 | char *words[MAXWORDS]; |
454 | ||
455 | nwords = ddebug_tokenize(query_string, words, MAXWORDS); | |
18c216c5 JC |
456 | if (nwords <= 0) { |
457 | pr_err("tokenize failed\n"); | |
fd89cfb8 | 458 | return -EINVAL; |
18c216c5 JC |
459 | } |
460 | /* check flags 1st (last arg) so query is pairs of spec,val */ | |
461 | if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) { | |
462 | pr_err("flags parse failed\n"); | |
fd89cfb8 | 463 | return -EINVAL; |
18c216c5 JC |
464 | } |
465 | if (ddebug_parse_query(words, nwords-1, &query, modname)) { | |
466 | pr_err("query parse failed\n"); | |
fd89cfb8 | 467 | return -EINVAL; |
18c216c5 | 468 | } |
fd89cfb8 | 469 | /* actually go and implement the change */ |
85f7f6c0 | 470 | nfound = ddebug_change(&query, flags, mask); |
f657fd21 | 471 | vpr_info_dq(&query, nfound ? "applied" : "no-match"); |
85f7f6c0 JC |
472 | |
473 | return nfound; | |
474 | } | |
475 | ||
476 | /* handle multiple queries in query string, continue on error, return | |
477 | last error or number of matching callsites. Module name is either | |
478 | in param (for boot arg) or perhaps in query string. | |
479 | */ | |
8e59b5cf | 480 | static int ddebug_exec_queries(char *query, const char *modname) |
85f7f6c0 JC |
481 | { |
482 | char *split; | |
483 | int i, errs = 0, exitcode = 0, rc, nfound = 0; | |
484 | ||
485 | for (i = 0; query; query = split) { | |
486 | split = strpbrk(query, ";\n"); | |
487 | if (split) | |
488 | *split++ = '\0'; | |
489 | ||
490 | query = skip_spaces(query); | |
491 | if (!query || !*query || *query == '#') | |
492 | continue; | |
493 | ||
b8ccd5de | 494 | vpr_info("query %d: \"%s\"\n", i, query); |
85f7f6c0 | 495 | |
8e59b5cf | 496 | rc = ddebug_exec_query(query, modname); |
85f7f6c0 JC |
497 | if (rc < 0) { |
498 | errs++; | |
499 | exitcode = rc; | |
f657fd21 | 500 | } else { |
85f7f6c0 | 501 | nfound += rc; |
f657fd21 | 502 | } |
85f7f6c0 JC |
503 | i++; |
504 | } | |
b8ccd5de | 505 | vpr_info("processed %d queries, with %d matches, %d errs\n", |
85f7f6c0 JC |
506 | i, nfound, errs); |
507 | ||
508 | if (exitcode) | |
509 | return exitcode; | |
510 | return nfound; | |
fd89cfb8 TR |
511 | } |
512 | ||
431625da JB |
513 | #define PREFIX_SIZE 64 |
514 | ||
515 | static int remaining(int wrote) | |
516 | { | |
517 | if (PREFIX_SIZE - wrote > 0) | |
518 | return PREFIX_SIZE - wrote; | |
519 | return 0; | |
520 | } | |
521 | ||
522 | static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf) | |
8ba6ebf5 | 523 | { |
431625da JB |
524 | int pos_after_tid; |
525 | int pos = 0; | |
8ba6ebf5 | 526 | |
798efc60 JP |
527 | *buf = '\0'; |
528 | ||
431625da | 529 | if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
8ba6ebf5 | 530 | if (in_interrupt()) |
798efc60 | 531 | pos += snprintf(buf + pos, remaining(pos), "<intr> "); |
8ba6ebf5 | 532 | else |
431625da | 533 | pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
798efc60 | 534 | task_pid_vnr(current)); |
8ba6ebf5 | 535 | } |
431625da JB |
536 | pos_after_tid = pos; |
537 | if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) | |
538 | pos += snprintf(buf + pos, remaining(pos), "%s:", | |
798efc60 | 539 | desc->modname); |
431625da JB |
540 | if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) |
541 | pos += snprintf(buf + pos, remaining(pos), "%s:", | |
798efc60 | 542 | desc->function); |
431625da | 543 | if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
07100be7 | 544 | pos += snprintf(buf + pos, remaining(pos), "%d:", |
798efc60 | 545 | desc->lineno); |
431625da JB |
546 | if (pos - pos_after_tid) |
547 | pos += snprintf(buf + pos, remaining(pos), " "); | |
548 | if (pos >= PREFIX_SIZE) | |
549 | buf[PREFIX_SIZE - 1] = '\0'; | |
6c2140ee | 550 | |
431625da | 551 | return buf; |
6c2140ee JP |
552 | } |
553 | ||
906d2015 | 554 | void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
8ba6ebf5 BVA |
555 | { |
556 | va_list args; | |
431625da JB |
557 | struct va_format vaf; |
558 | char buf[PREFIX_SIZE]; | |
8ba6ebf5 BVA |
559 | |
560 | BUG_ON(!descriptor); | |
561 | BUG_ON(!fmt); | |
562 | ||
563 | va_start(args, fmt); | |
798efc60 | 564 | |
431625da JB |
565 | vaf.fmt = fmt; |
566 | vaf.va = &args; | |
798efc60 | 567 | |
906d2015 | 568 | printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
798efc60 | 569 | |
8ba6ebf5 | 570 | va_end(args); |
8ba6ebf5 BVA |
571 | } |
572 | EXPORT_SYMBOL(__dynamic_pr_debug); | |
573 | ||
906d2015 | 574 | void __dynamic_dev_dbg(struct _ddebug *descriptor, |
cbc46635 JP |
575 | const struct device *dev, const char *fmt, ...) |
576 | { | |
577 | struct va_format vaf; | |
578 | va_list args; | |
cbc46635 JP |
579 | |
580 | BUG_ON(!descriptor); | |
581 | BUG_ON(!fmt); | |
582 | ||
583 | va_start(args, fmt); | |
798efc60 | 584 | |
cbc46635 JP |
585 | vaf.fmt = fmt; |
586 | vaf.va = &args; | |
798efc60 JP |
587 | |
588 | if (!dev) { | |
906d2015 | 589 | printk(KERN_DEBUG "(NULL device *): %pV", &vaf); |
798efc60 JP |
590 | } else { |
591 | char buf[PREFIX_SIZE]; | |
798efc60 | 592 | |
a39d4a85 | 593 | dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV", |
906d2015 JP |
594 | dynamic_emit_prefix(descriptor, buf), |
595 | dev_driver_string(dev), dev_name(dev), | |
596 | &vaf); | |
798efc60 JP |
597 | } |
598 | ||
cbc46635 | 599 | va_end(args); |
cbc46635 JP |
600 | } |
601 | EXPORT_SYMBOL(__dynamic_dev_dbg); | |
602 | ||
0feefd97 JB |
603 | #ifdef CONFIG_NET |
604 | ||
906d2015 JP |
605 | void __dynamic_netdev_dbg(struct _ddebug *descriptor, |
606 | const struct net_device *dev, const char *fmt, ...) | |
ffa10cb4 JB |
607 | { |
608 | struct va_format vaf; | |
609 | va_list args; | |
ffa10cb4 JB |
610 | |
611 | BUG_ON(!descriptor); | |
612 | BUG_ON(!fmt); | |
613 | ||
614 | va_start(args, fmt); | |
b004ff49 | 615 | |
ffa10cb4 JB |
616 | vaf.fmt = fmt; |
617 | vaf.va = &args; | |
b004ff49 JP |
618 | |
619 | if (dev && dev->dev.parent) { | |
620 | char buf[PREFIX_SIZE]; | |
666f355f | 621 | |
a39d4a85 | 622 | dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent, |
906d2015 JP |
623 | "%s%s %s %s%s: %pV", |
624 | dynamic_emit_prefix(descriptor, buf), | |
625 | dev_driver_string(dev->dev.parent), | |
626 | dev_name(dev->dev.parent), | |
627 | netdev_name(dev), netdev_reg_state(dev), | |
628 | &vaf); | |
b004ff49 | 629 | } else if (dev) { |
906d2015 JP |
630 | printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev), |
631 | netdev_reg_state(dev), &vaf); | |
b004ff49 | 632 | } else { |
906d2015 | 633 | printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); |
b004ff49 JP |
634 | } |
635 | ||
ffa10cb4 | 636 | va_end(args); |
ffa10cb4 JB |
637 | } |
638 | EXPORT_SYMBOL(__dynamic_netdev_dbg); | |
639 | ||
0feefd97 JB |
640 | #endif |
641 | ||
923abb9d GP |
642 | #if IS_ENABLED(CONFIG_INFINIBAND) |
643 | ||
644 | void __dynamic_ibdev_dbg(struct _ddebug *descriptor, | |
645 | const struct ib_device *ibdev, const char *fmt, ...) | |
646 | { | |
647 | struct va_format vaf; | |
648 | va_list args; | |
649 | ||
650 | va_start(args, fmt); | |
651 | ||
652 | vaf.fmt = fmt; | |
653 | vaf.va = &args; | |
654 | ||
655 | if (ibdev && ibdev->dev.parent) { | |
656 | char buf[PREFIX_SIZE]; | |
657 | ||
658 | dev_printk_emit(LOGLEVEL_DEBUG, ibdev->dev.parent, | |
659 | "%s%s %s %s: %pV", | |
660 | dynamic_emit_prefix(descriptor, buf), | |
661 | dev_driver_string(ibdev->dev.parent), | |
662 | dev_name(ibdev->dev.parent), | |
663 | dev_name(&ibdev->dev), | |
664 | &vaf); | |
665 | } else if (ibdev) { | |
666 | printk(KERN_DEBUG "%s: %pV", dev_name(&ibdev->dev), &vaf); | |
667 | } else { | |
668 | printk(KERN_DEBUG "(NULL ib_device): %pV", &vaf); | |
669 | } | |
670 | ||
671 | va_end(args); | |
672 | } | |
673 | EXPORT_SYMBOL(__dynamic_ibdev_dbg); | |
674 | ||
675 | #endif | |
676 | ||
bc757f6f JC |
677 | #define DDEBUG_STRING_SIZE 1024 |
678 | static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; | |
679 | ||
a648ec05 TR |
680 | static __init int ddebug_setup_query(char *str) |
681 | { | |
bc757f6f | 682 | if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5 | 683 | pr_warn("ddebug boot param string too large\n"); |
a648ec05 TR |
684 | return 0; |
685 | } | |
bc757f6f | 686 | strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05 TR |
687 | return 1; |
688 | } | |
689 | ||
690 | __setup("ddebug_query=", ddebug_setup_query); | |
691 | ||
e9d376f0 | 692 | /* |
231821d4 | 693 | * File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the |
e9d376f0 JB |
694 | * command text from userspace, parses and executes it. |
695 | */ | |
7281491c | 696 | #define USER_BUF_PAGE 4096 |
e9d376f0 JB |
697 | static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, |
698 | size_t len, loff_t *offp) | |
699 | { | |
7281491c | 700 | char *tmpbuf; |
fd89cfb8 | 701 | int ret; |
e9d376f0 JB |
702 | |
703 | if (len == 0) | |
704 | return 0; | |
7281491c JC |
705 | if (len > USER_BUF_PAGE - 1) { |
706 | pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE); | |
e9d376f0 | 707 | return -E2BIG; |
7281491c | 708 | } |
16e5c1fc AV |
709 | tmpbuf = memdup_user_nul(ubuf, len); |
710 | if (IS_ERR(tmpbuf)) | |
711 | return PTR_ERR(tmpbuf); | |
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 | ||
e9d376f0 JB |
775 | mutex_lock(&ddebug_lock); |
776 | ||
777 | if (!n) | |
778 | return SEQ_START_TOKEN; | |
779 | if (n < 0) | |
780 | return NULL; | |
781 | dp = ddebug_iter_first(iter); | |
782 | while (dp != NULL && --n > 0) | |
783 | dp = ddebug_iter_next(iter); | |
784 | return dp; | |
785 | } | |
786 | ||
787 | /* | |
788 | * Seq_ops next method. Called several times within a read() | |
789 | * call from userspace, with ddebug_lock held. Walks to the | |
790 | * next _ddebug object with a special case for the header line. | |
791 | */ | |
792 | static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos) | |
793 | { | |
794 | struct ddebug_iter *iter = m->private; | |
795 | struct _ddebug *dp; | |
796 | ||
e9d376f0 JB |
797 | if (p == SEQ_START_TOKEN) |
798 | dp = ddebug_iter_first(iter); | |
799 | else | |
800 | dp = ddebug_iter_next(iter); | |
801 | ++*pos; | |
802 | return dp; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Seq_ops show method. Called several times within a read() | |
807 | * call from userspace, with ddebug_lock held. Formats the | |
808 | * current _ddebug as a single human-readable line, with a | |
809 | * special case for the header line. | |
810 | */ | |
811 | static int ddebug_proc_show(struct seq_file *m, void *p) | |
812 | { | |
813 | struct ddebug_iter *iter = m->private; | |
814 | struct _ddebug *dp = p; | |
f678ce8c | 815 | struct flagsbuf flags; |
e9d376f0 | 816 | |
e9d376f0 JB |
817 | if (p == SEQ_START_TOKEN) { |
818 | seq_puts(m, | |
f657fd21 | 819 | "# filename:lineno [module]function flags format\n"); |
e9d376f0 JB |
820 | return 0; |
821 | } | |
822 | ||
5ca7d2a6 | 823 | seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21 JP |
824 | trim_prefix(dp->filename), dp->lineno, |
825 | iter->table->mod_name, dp->function, | |
f678ce8c | 826 | ddebug_describe_flags(dp->flags, &flags)); |
e9d376f0 JB |
827 | seq_escape(m, dp->format, "\t\r\n\""); |
828 | seq_puts(m, "\"\n"); | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Seq_ops stop method. Called at the end of each read() | |
835 | * call from userspace. Drops ddebug_lock. | |
836 | */ | |
837 | static void ddebug_proc_stop(struct seq_file *m, void *p) | |
838 | { | |
e9d376f0 JB |
839 | mutex_unlock(&ddebug_lock); |
840 | } | |
841 | ||
842 | static const struct seq_operations ddebug_proc_seqops = { | |
843 | .start = ddebug_proc_start, | |
844 | .next = ddebug_proc_next, | |
845 | .show = ddebug_proc_show, | |
846 | .stop = ddebug_proc_stop | |
847 | }; | |
848 | ||
e9d376f0 JB |
849 | static int ddebug_proc_open(struct inode *inode, struct file *file) |
850 | { | |
b8ccd5de | 851 | vpr_info("called\n"); |
4bad78c5 RJ |
852 | return seq_open_private(file, &ddebug_proc_seqops, |
853 | sizeof(struct ddebug_iter)); | |
e9d376f0 JB |
854 | } |
855 | ||
856 | static const struct file_operations ddebug_proc_fops = { | |
857 | .owner = THIS_MODULE, | |
858 | .open = ddebug_proc_open, | |
859 | .read = seq_read, | |
860 | .llseek = seq_lseek, | |
861 | .release = seq_release_private, | |
862 | .write = ddebug_proc_write | |
863 | }; | |
864 | ||
239a5791 GKH |
865 | static const struct proc_ops proc_fops = { |
866 | .proc_open = ddebug_proc_open, | |
867 | .proc_read = seq_read, | |
868 | .proc_lseek = seq_lseek, | |
869 | .proc_release = seq_release_private, | |
870 | .proc_write = ddebug_proc_write | |
871 | }; | |
872 | ||
e9d376f0 JB |
873 | /* |
874 | * Allocate a new ddebug_table for the given module | |
875 | * and add it to the global list. | |
876 | */ | |
877 | int ddebug_add_module(struct _ddebug *tab, unsigned int n, | |
878 | const char *name) | |
879 | { | |
880 | struct ddebug_table *dt; | |
e9d376f0 JB |
881 | |
882 | dt = kzalloc(sizeof(*dt), GFP_KERNEL); | |
513770f5 RV |
883 | if (dt == NULL) { |
884 | pr_err("error adding module: %s\n", name); | |
e9d376f0 | 885 | return -ENOMEM; |
513770f5 | 886 | } |
cdf6d006 RV |
887 | /* |
888 | * For built-in modules, name lives in .rodata and is | |
889 | * immortal. For loaded modules, name points at the name[] | |
890 | * member of struct module, which lives at least as long as | |
891 | * this struct ddebug_table. | |
892 | */ | |
893 | dt->mod_name = name; | |
e9d376f0 | 894 | dt->num_ddebugs = n; |
e9d376f0 JB |
895 | dt->ddebugs = tab; |
896 | ||
897 | mutex_lock(&ddebug_lock); | |
47e9f5a8 | 898 | list_add(&dt->link, &ddebug_tables); |
e9d376f0 JB |
899 | mutex_unlock(&ddebug_lock); |
900 | ||
481c0e33 | 901 | v2pr_info("%u debug prints in module %s\n", n, dt->mod_name); |
e9d376f0 JB |
902 | return 0; |
903 | } | |
e9d376f0 | 904 | |
6ab676e9 JC |
905 | /* helper for ddebug_dyndbg_(boot|module)_param_cb */ |
906 | static int ddebug_dyndbg_param_cb(char *param, char *val, | |
907 | const char *modname, int on_err) | |
b48420c1 | 908 | { |
b48420c1 JC |
909 | char *sep; |
910 | ||
911 | sep = strchr(param, '.'); | |
912 | if (sep) { | |
6ab676e9 | 913 | /* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1 JC |
914 | *sep = '\0'; |
915 | modname = param; | |
916 | param = sep + 1; | |
917 | } | |
918 | if (strcmp(param, "dyndbg")) | |
6ab676e9 | 919 | return on_err; /* determined by caller */ |
b48420c1 | 920 | |
8e59b5cf JC |
921 | ddebug_exec_queries((val ? val : "+p"), modname); |
922 | ||
b48420c1 JC |
923 | return 0; /* query failure shouldnt stop module load */ |
924 | } | |
925 | ||
6ab676e9 JC |
926 | /* handle both dyndbg and $module.dyndbg params at boot */ |
927 | static int ddebug_dyndbg_boot_param_cb(char *param, char *val, | |
ecc86170 | 928 | const char *unused, void *arg) |
b48420c1 | 929 | { |
6ab676e9 JC |
930 | vpr_info("%s=\"%s\"\n", param, val); |
931 | return ddebug_dyndbg_param_cb(param, val, NULL, 0); | |
932 | } | |
b48420c1 | 933 | |
6ab676e9 JC |
934 | /* |
935 | * modprobe foo finds foo.params in boot-args, strips "foo.", and | |
936 | * passes them to load_module(). This callback gets unknown params, | |
937 | * processes dyndbg params, rejects others. | |
938 | */ | |
939 | int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module) | |
940 | { | |
941 | vpr_info("module: %s %s=\"%s\"\n", module, param, val); | |
942 | return ddebug_dyndbg_param_cb(param, val, module, -ENOENT); | |
b48420c1 JC |
943 | } |
944 | ||
e9d376f0 JB |
945 | static void ddebug_table_free(struct ddebug_table *dt) |
946 | { | |
947 | list_del_init(&dt->link); | |
e9d376f0 JB |
948 | kfree(dt); |
949 | } | |
950 | ||
951 | /* | |
952 | * Called in response to a module being unloaded. Removes | |
953 | * any ddebug_table's which point at the module. | |
954 | */ | |
ff49d74a | 955 | int ddebug_remove_module(const char *mod_name) |
e9d376f0 JB |
956 | { |
957 | struct ddebug_table *dt, *nextdt; | |
958 | int ret = -ENOENT; | |
959 | ||
481c0e33 | 960 | v2pr_info("removing module \"%s\"\n", mod_name); |
e9d376f0 JB |
961 | |
962 | mutex_lock(&ddebug_lock); | |
963 | list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) { | |
4573fe15 | 964 | if (dt->mod_name == mod_name) { |
e9d376f0 JB |
965 | ddebug_table_free(dt); |
966 | ret = 0; | |
4573fe15 | 967 | break; |
e9d376f0 JB |
968 | } |
969 | } | |
970 | mutex_unlock(&ddebug_lock); | |
971 | return ret; | |
972 | } | |
e9d376f0 JB |
973 | |
974 | static void ddebug_remove_all_tables(void) | |
975 | { | |
976 | mutex_lock(&ddebug_lock); | |
977 | while (!list_empty(&ddebug_tables)) { | |
978 | struct ddebug_table *dt = list_entry(ddebug_tables.next, | |
979 | struct ddebug_table, | |
980 | link); | |
981 | ddebug_table_free(dt); | |
982 | } | |
983 | mutex_unlock(&ddebug_lock); | |
984 | } | |
985 | ||
6a5c083d TR |
986 | static __initdata int ddebug_init_success; |
987 | ||
239a5791 | 988 | static int __init dynamic_debug_init_control(void) |
e9d376f0 | 989 | { |
239a5791 GKH |
990 | struct proc_dir_entry *procfs_dir; |
991 | struct dentry *debugfs_dir; | |
6a5c083d TR |
992 | |
993 | if (!ddebug_init_success) | |
994 | return -ENODEV; | |
e9d376f0 | 995 | |
239a5791 GKH |
996 | /* Create the control file in debugfs if it is enabled */ |
997 | if (debugfs_initialized()) { | |
998 | debugfs_dir = debugfs_create_dir("dynamic_debug", NULL); | |
999 | debugfs_create_file("control", 0644, debugfs_dir, NULL, | |
1000 | &ddebug_proc_fops); | |
1001 | } | |
1002 | ||
1003 | /* Also create the control file in procfs */ | |
1004 | procfs_dir = proc_mkdir("dynamic_debug", NULL); | |
1005 | if (procfs_dir) | |
1006 | proc_create("control", 0644, procfs_dir, &proc_fops); | |
9fd714cd | 1007 | |
6a5c083d TR |
1008 | return 0; |
1009 | } | |
1010 | ||
1011 | static int __init dynamic_debug_init(void) | |
1012 | { | |
1013 | struct _ddebug *iter, *iter_start; | |
1014 | const char *modname = NULL; | |
b48420c1 | 1015 | char *cmdline; |
6a5c083d | 1016 | int ret = 0; |
41076927 | 1017 | int n = 0, entries = 0, modct = 0; |
6a5c083d | 1018 | |
e5ebffe1 | 1019 | if (&__start___dyndbg == &__stop___dyndbg) { |
ceabef7d OZ |
1020 | if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) { |
1021 | pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n"); | |
1022 | return 1; | |
1023 | } | |
1024 | pr_info("Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build\n"); | |
1025 | ddebug_init_success = 1; | |
1026 | return 0; | |
b5b78f83 | 1027 | } |
e5ebffe1 | 1028 | iter = __start___dyndbg; |
b5b78f83 JC |
1029 | modname = iter->modname; |
1030 | iter_start = iter; | |
e5ebffe1 | 1031 | for (; iter < __stop___dyndbg; iter++) { |
41076927 | 1032 | entries++; |
b5b78f83 | 1033 | if (strcmp(modname, iter->modname)) { |
41076927 | 1034 | modct++; |
b5b78f83 JC |
1035 | ret = ddebug_add_module(iter_start, n, modname); |
1036 | if (ret) | |
af442399 | 1037 | goto out_err; |
b5b78f83 JC |
1038 | n = 0; |
1039 | modname = iter->modname; | |
1040 | iter_start = iter; | |
e9d376f0 | 1041 | } |
b5b78f83 | 1042 | n++; |
e9d376f0 | 1043 | } |
b5b78f83 JC |
1044 | ret = ddebug_add_module(iter_start, n, modname); |
1045 | if (ret) | |
af442399 | 1046 | goto out_err; |
a648ec05 | 1047 | |
af442399 | 1048 | ddebug_init_success = 1; |
81d0c2c6 | 1049 | vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in __dyndbg section\n", |
f657fd21 | 1050 | modct, entries, (int)(modct * sizeof(struct ddebug_table)), |
81d0c2c6 | 1051 | (int)(entries * sizeof(struct _ddebug))); |
af442399 JC |
1052 | |
1053 | /* apply ddebug_query boot param, dont unload tables on err */ | |
a648ec05 | 1054 | if (ddebug_setup_string[0] != '\0') { |
f657fd21 | 1055 | pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n"); |
8e59b5cf | 1056 | ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0 | 1057 | if (ret < 0) |
f657fd21 | 1058 | pr_warn("Invalid ddebug boot param %s\n", |
4ad275e5 | 1059 | ddebug_setup_string); |
a648ec05 | 1060 | else |
85f7f6c0 | 1061 | pr_info("%d changes by ddebug_query\n", ret); |
a648ec05 | 1062 | } |
b48420c1 JC |
1063 | /* now that ddebug tables are loaded, process all boot args |
1064 | * again to find and activate queries given in dyndbg params. | |
1065 | * While this has already been done for known boot params, it | |
1066 | * ignored the unknown ones (dyndbg in particular). Reusing | |
1067 | * parse_args avoids ad-hoc parsing. This will also attempt | |
1068 | * to activate queries for not-yet-loaded modules, which is | |
1069 | * slightly noisy if verbose, but harmless. | |
1070 | */ | |
1071 | cmdline = kstrdup(saved_command_line, GFP_KERNEL); | |
1072 | parse_args("dyndbg params", cmdline, NULL, | |
ecc86170 | 1073 | 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb); |
b48420c1 | 1074 | kfree(cmdline); |
af442399 | 1075 | return 0; |
a648ec05 | 1076 | |
af442399 JC |
1077 | out_err: |
1078 | ddebug_remove_all_tables(); | |
e9d376f0 JB |
1079 | return 0; |
1080 | } | |
6a5c083d | 1081 | /* Allow early initialization for boot messages via boot param */ |
3ec5652a | 1082 | early_initcall(dynamic_debug_init); |
b48420c1 | 1083 | |
6a5c083d | 1084 | /* Debugfs setup must be done later */ |
239a5791 | 1085 | fs_initcall(dynamic_debug_init_control); |