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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 | 39 | |
923abb9d GP |
40 | #include <rdma/ib_verbs.h> |
41 | ||
e9d376f0 JB |
42 | extern struct _ddebug __start___verbose[]; |
43 | extern struct _ddebug __stop___verbose[]; | |
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 | ||
e9d376f0 JB |
90 | /* format a string into buf[] which describes the _ddebug's flags */ |
91 | static char *ddebug_describe_flags(struct _ddebug *dp, char *buf, | |
92 | size_t maxlen) | |
93 | { | |
94 | char *p = buf; | |
8ba6ebf5 | 95 | int i; |
e9d376f0 | 96 | |
5ca7d2a6 | 97 | BUG_ON(maxlen < 6); |
8ba6ebf5 BVA |
98 | for (i = 0; i < ARRAY_SIZE(opt_array); ++i) |
99 | if (dp->flags & opt_array[i].flag) | |
100 | *p++ = opt_array[i].opt_char; | |
e9d376f0 | 101 | if (p == buf) |
5ca7d2a6 | 102 | *p++ = '_'; |
e9d376f0 JB |
103 | *p = '\0'; |
104 | ||
105 | return buf; | |
106 | } | |
107 | ||
f657fd21 | 108 | #define vpr_info(fmt, ...) \ |
b8ccd5de | 109 | do { \ |
f657fd21 JP |
110 | if (verbose) \ |
111 | pr_info(fmt, ##__VA_ARGS__); \ | |
574b3725 JC |
112 | } while (0) |
113 | ||
f657fd21 JP |
114 | static void vpr_info_dq(const struct ddebug_query *query, const char *msg) |
115 | { | |
116 | /* trim any trailing newlines */ | |
117 | int fmtlen = 0; | |
118 | ||
119 | if (query->format) { | |
120 | fmtlen = strlen(query->format); | |
121 | while (fmtlen && query->format[fmtlen - 1] == '\n') | |
122 | fmtlen--; | |
123 | } | |
124 | ||
125 | vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n", | |
126 | msg, | |
127 | query->function ? query->function : "", | |
128 | query->filename ? query->filename : "", | |
129 | query->module ? query->module : "", | |
130 | fmtlen, query->format ? query->format : "", | |
131 | query->first_lineno, query->last_lineno); | |
132 | } | |
133 | ||
e9d376f0 | 134 | /* |
85f7f6c0 JC |
135 | * Search the tables for _ddebug's which match the given `query' and |
136 | * apply the `flags' and `mask' to them. Returns number of matching | |
137 | * callsites, normally the same as number of changes. If verbose, | |
138 | * logs the changes. Takes ddebug_lock. | |
e9d376f0 | 139 | */ |
85f7f6c0 JC |
140 | static int ddebug_change(const struct ddebug_query *query, |
141 | unsigned int flags, unsigned int mask) | |
e9d376f0 JB |
142 | { |
143 | int i; | |
144 | struct ddebug_table *dt; | |
145 | unsigned int newflags; | |
146 | unsigned int nfound = 0; | |
5ca7d2a6 | 147 | char flagbuf[10]; |
e9d376f0 JB |
148 | |
149 | /* search for matching ddebugs */ | |
150 | mutex_lock(&ddebug_lock); | |
151 | list_for_each_entry(dt, &ddebug_tables, link) { | |
152 | ||
153 | /* match against the module name */ | |
578b1e07 DC |
154 | if (query->module && |
155 | !match_wildcard(query->module, dt->mod_name)) | |
e9d376f0 JB |
156 | continue; |
157 | ||
f657fd21 | 158 | for (i = 0; i < dt->num_ddebugs; i++) { |
e9d376f0 JB |
159 | struct _ddebug *dp = &dt->ddebugs[i]; |
160 | ||
161 | /* match against the source filename */ | |
d6a238d2 | 162 | if (query->filename && |
578b1e07 DC |
163 | !match_wildcard(query->filename, dp->filename) && |
164 | !match_wildcard(query->filename, | |
165 | kbasename(dp->filename)) && | |
166 | !match_wildcard(query->filename, | |
167 | trim_prefix(dp->filename))) | |
e9d376f0 JB |
168 | continue; |
169 | ||
170 | /* match against the function */ | |
d6a238d2 | 171 | if (query->function && |
578b1e07 | 172 | !match_wildcard(query->function, dp->function)) |
e9d376f0 JB |
173 | continue; |
174 | ||
175 | /* match against the format */ | |
d6a238d2 JC |
176 | if (query->format && |
177 | !strstr(dp->format, query->format)) | |
e9d376f0 JB |
178 | continue; |
179 | ||
180 | /* match against the line number range */ | |
181 | if (query->first_lineno && | |
182 | dp->lineno < query->first_lineno) | |
183 | continue; | |
184 | if (query->last_lineno && | |
185 | dp->lineno > query->last_lineno) | |
186 | continue; | |
187 | ||
188 | nfound++; | |
189 | ||
190 | newflags = (dp->flags & mask) | flags; | |
191 | if (newflags == dp->flags) | |
192 | continue; | |
e9666d10 | 193 | #ifdef CONFIG_JUMP_LABEL |
9049fc74 JB |
194 | if (dp->flags & _DPRINTK_FLAGS_PRINT) { |
195 | if (!(flags & _DPRINTK_FLAGS_PRINT)) | |
196 | static_branch_disable(&dp->key.dd_key_true); | |
197 | } else if (flags & _DPRINTK_FLAGS_PRINT) | |
198 | static_branch_enable(&dp->key.dd_key_true); | |
199 | #endif | |
e9d376f0 | 200 | dp->flags = newflags; |
b8ccd5de | 201 | vpr_info("changed %s:%d [%s]%s =%s\n", |
f657fd21 JP |
202 | trim_prefix(dp->filename), dp->lineno, |
203 | dt->mod_name, dp->function, | |
204 | ddebug_describe_flags(dp, flagbuf, | |
205 | sizeof(flagbuf))); | |
e9d376f0 JB |
206 | } |
207 | } | |
208 | mutex_unlock(&ddebug_lock); | |
209 | ||
210 | if (!nfound && verbose) | |
4ad275e5 | 211 | pr_info("no matches for query\n"); |
85f7f6c0 JC |
212 | |
213 | return nfound; | |
e9d376f0 JB |
214 | } |
215 | ||
e9d376f0 JB |
216 | /* |
217 | * Split the buffer `buf' into space-separated words. | |
9898abb3 GB |
218 | * Handles simple " and ' quoting, i.e. without nested, |
219 | * embedded or escaped \". Return the number of words | |
220 | * or <0 on error. | |
e9d376f0 JB |
221 | */ |
222 | static int ddebug_tokenize(char *buf, char *words[], int maxwords) | |
223 | { | |
224 | int nwords = 0; | |
225 | ||
9898abb3 GB |
226 | while (*buf) { |
227 | char *end; | |
228 | ||
229 | /* Skip leading whitespace */ | |
e7d2860b | 230 | buf = skip_spaces(buf); |
9898abb3 GB |
231 | if (!*buf) |
232 | break; /* oh, it was trailing whitespace */ | |
8bd6026e JC |
233 | if (*buf == '#') |
234 | break; /* token starts comment, skip rest of line */ | |
9898abb3 | 235 | |
07100be7 | 236 | /* find `end' of word, whitespace separated or quoted */ |
9898abb3 GB |
237 | if (*buf == '"' || *buf == '\'') { |
238 | int quote = *buf++; | |
f657fd21 | 239 | for (end = buf; *end && *end != quote; end++) |
9898abb3 | 240 | ; |
18c216c5 JC |
241 | if (!*end) { |
242 | pr_err("unclosed quote: %s\n", buf); | |
9898abb3 | 243 | return -EINVAL; /* unclosed quote */ |
18c216c5 | 244 | } |
9898abb3 | 245 | } else { |
f657fd21 | 246 | for (end = buf; *end && !isspace(*end); end++) |
9898abb3 GB |
247 | ; |
248 | BUG_ON(end == buf); | |
249 | } | |
9898abb3 | 250 | |
07100be7 | 251 | /* `buf' is start of word, `end' is one past its end */ |
18c216c5 JC |
252 | if (nwords == maxwords) { |
253 | pr_err("too many words, legal max <=%d\n", maxwords); | |
9898abb3 | 254 | return -EINVAL; /* ran out of words[] before bytes */ |
18c216c5 | 255 | } |
9898abb3 GB |
256 | if (*end) |
257 | *end++ = '\0'; /* terminate the word */ | |
258 | words[nwords++] = buf; | |
259 | buf = end; | |
260 | } | |
e9d376f0 JB |
261 | |
262 | if (verbose) { | |
263 | int i; | |
4ad275e5 | 264 | pr_info("split into words:"); |
f657fd21 | 265 | for (i = 0; i < nwords; i++) |
4ad275e5 JP |
266 | pr_cont(" \"%s\"", words[i]); |
267 | pr_cont("\n"); | |
e9d376f0 JB |
268 | } |
269 | ||
270 | return nwords; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Parse a single line number. Note that the empty string "" | |
275 | * is treated as a special case and converted to zero, which | |
276 | * is later treated as a "don't care" value. | |
277 | */ | |
278 | static inline int parse_lineno(const char *str, unsigned int *val) | |
279 | { | |
e9d376f0 JB |
280 | BUG_ON(str == NULL); |
281 | if (*str == '\0') { | |
282 | *val = 0; | |
283 | return 0; | |
284 | } | |
4592599a | 285 | if (kstrtouint(str, 10, val) < 0) { |
18c216c5 JC |
286 | pr_err("bad line-number: %s\n", str); |
287 | return -EINVAL; | |
288 | } | |
289 | return 0; | |
e9d376f0 JB |
290 | } |
291 | ||
820874c7 JC |
292 | static int check_set(const char **dest, char *src, char *name) |
293 | { | |
294 | int rc = 0; | |
295 | ||
296 | if (*dest) { | |
297 | rc = -EINVAL; | |
f657fd21 JP |
298 | pr_err("match-spec:%s val:%s overridden by %s\n", |
299 | name, *dest, src); | |
820874c7 JC |
300 | } |
301 | *dest = src; | |
302 | return rc; | |
303 | } | |
304 | ||
e9d376f0 JB |
305 | /* |
306 | * Parse words[] as a ddebug query specification, which is a series | |
307 | * of (keyword, value) pairs chosen from these possibilities: | |
308 | * | |
309 | * func <function-name> | |
310 | * file <full-pathname> | |
311 | * file <base-filename> | |
312 | * module <module-name> | |
313 | * format <escaped-string-to-find-in-format> | |
314 | * line <lineno> | |
315 | * line <first-lineno>-<last-lineno> // where either may be empty | |
820874c7 JC |
316 | * |
317 | * Only 1 of each type is allowed. | |
318 | * Returns 0 on success, <0 on error. | |
e9d376f0 JB |
319 | */ |
320 | static int ddebug_parse_query(char *words[], int nwords, | |
8e59b5cf | 321 | struct ddebug_query *query, const char *modname) |
e9d376f0 JB |
322 | { |
323 | unsigned int i; | |
bd8c154a | 324 | int rc = 0; |
e9d376f0 JB |
325 | |
326 | /* check we have an even number of words */ | |
18c216c5 JC |
327 | if (nwords % 2 != 0) { |
328 | pr_err("expecting pairs of match-spec <value>\n"); | |
e9d376f0 | 329 | return -EINVAL; |
18c216c5 | 330 | } |
e9d376f0 JB |
331 | memset(query, 0, sizeof(*query)); |
332 | ||
8e59b5cf JC |
333 | if (modname) |
334 | /* support $modname.dyndbg=<multiple queries> */ | |
335 | query->module = modname; | |
336 | ||
f657fd21 JP |
337 | for (i = 0; i < nwords; i += 2) { |
338 | if (!strcmp(words[i], "func")) { | |
820874c7 | 339 | rc = check_set(&query->function, words[i+1], "func"); |
f657fd21 | 340 | } else if (!strcmp(words[i], "file")) { |
820874c7 | 341 | rc = check_set(&query->filename, words[i+1], "file"); |
f657fd21 | 342 | } else if (!strcmp(words[i], "module")) { |
820874c7 | 343 | rc = check_set(&query->module, words[i+1], "module"); |
f657fd21 | 344 | } else if (!strcmp(words[i], "format")) { |
d338b137 AS |
345 | string_unescape_inplace(words[i+1], UNESCAPE_SPACE | |
346 | UNESCAPE_OCTAL | | |
347 | UNESCAPE_SPECIAL); | |
348 | rc = check_set(&query->format, words[i+1], "format"); | |
f657fd21 | 349 | } else if (!strcmp(words[i], "line")) { |
e9d376f0 JB |
350 | char *first = words[i+1]; |
351 | char *last = strchr(first, '-'); | |
820874c7 | 352 | if (query->first_lineno || query->last_lineno) { |
18c216c5 | 353 | pr_err("match-spec: line used 2x\n"); |
820874c7 JC |
354 | return -EINVAL; |
355 | } | |
e9d376f0 JB |
356 | if (last) |
357 | *last++ = '\0'; | |
d9e133e6 | 358 | if (parse_lineno(first, &query->first_lineno) < 0) |
e9d376f0 | 359 | return -EINVAL; |
820874c7 | 360 | if (last) { |
e9d376f0 | 361 | /* range <first>-<last> */ |
3ace678f AR |
362 | if (parse_lineno(last, &query->last_lineno) < 0) |
363 | return -EINVAL; | |
364 | ||
1f3c790b RD |
365 | /* special case for last lineno not specified */ |
366 | if (query->last_lineno == 0) | |
367 | query->last_lineno = UINT_MAX; | |
368 | ||
3ace678f | 369 | if (query->last_lineno < query->first_lineno) { |
18c216c5 JC |
370 | pr_err("last-line:%d < 1st-line:%d\n", |
371 | query->last_lineno, | |
372 | query->first_lineno); | |
e9d376f0 | 373 | return -EINVAL; |
820874c7 | 374 | } |
e9d376f0 JB |
375 | } else { |
376 | query->last_lineno = query->first_lineno; | |
377 | } | |
378 | } else { | |
ae27f86a | 379 | pr_err("unknown keyword \"%s\"\n", words[i]); |
e9d376f0 JB |
380 | return -EINVAL; |
381 | } | |
820874c7 JC |
382 | if (rc) |
383 | return rc; | |
e9d376f0 | 384 | } |
574b3725 | 385 | vpr_info_dq(query, "parsed"); |
e9d376f0 JB |
386 | return 0; |
387 | } | |
388 | ||
389 | /* | |
390 | * Parse `str' as a flags specification, format [-+=][p]+. | |
391 | * Sets up *maskp and *flagsp to be used when changing the | |
392 | * flags fields of matched _ddebug's. Returns 0 on success | |
393 | * or <0 on error. | |
394 | */ | |
395 | static int ddebug_parse_flags(const char *str, unsigned int *flagsp, | |
396 | unsigned int *maskp) | |
397 | { | |
398 | unsigned flags = 0; | |
8ba6ebf5 | 399 | int op = '=', i; |
e9d376f0 JB |
400 | |
401 | switch (*str) { | |
402 | case '+': | |
403 | case '-': | |
404 | case '=': | |
405 | op = *str++; | |
406 | break; | |
407 | default: | |
18c216c5 | 408 | pr_err("bad flag-op %c, at start of %s\n", *str, str); |
e9d376f0 JB |
409 | return -EINVAL; |
410 | } | |
b8ccd5de | 411 | vpr_info("op='%c'\n", op); |
e9d376f0 | 412 | |
f657fd21 | 413 | for (; *str ; ++str) { |
8ba6ebf5 BVA |
414 | for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) { |
415 | if (*str == opt_array[i].opt_char) { | |
416 | flags |= opt_array[i].flag; | |
417 | break; | |
418 | } | |
e9d376f0 | 419 | } |
18c216c5 JC |
420 | if (i < 0) { |
421 | pr_err("unknown flag '%c' in \"%s\"\n", *str, str); | |
8ba6ebf5 | 422 | return -EINVAL; |
18c216c5 | 423 | } |
e9d376f0 | 424 | } |
b8ccd5de | 425 | vpr_info("flags=0x%x\n", flags); |
e9d376f0 JB |
426 | |
427 | /* calculate final *flagsp, *maskp according to mask and op */ | |
428 | switch (op) { | |
429 | case '=': | |
430 | *maskp = 0; | |
431 | *flagsp = flags; | |
432 | break; | |
433 | case '+': | |
434 | *maskp = ~0U; | |
435 | *flagsp = flags; | |
436 | break; | |
437 | case '-': | |
438 | *maskp = ~flags; | |
439 | *flagsp = 0; | |
440 | break; | |
441 | } | |
b8ccd5de | 442 | vpr_info("*flagsp=0x%x *maskp=0x%x\n", *flagsp, *maskp); |
e9d376f0 JB |
443 | return 0; |
444 | } | |
445 | ||
8e59b5cf | 446 | static int ddebug_exec_query(char *query_string, const char *modname) |
fd89cfb8 TR |
447 | { |
448 | unsigned int flags = 0, mask = 0; | |
449 | struct ddebug_query query; | |
450 | #define MAXWORDS 9 | |
85f7f6c0 | 451 | int nwords, nfound; |
fd89cfb8 TR |
452 | char *words[MAXWORDS]; |
453 | ||
454 | nwords = ddebug_tokenize(query_string, words, MAXWORDS); | |
18c216c5 JC |
455 | if (nwords <= 0) { |
456 | pr_err("tokenize failed\n"); | |
fd89cfb8 | 457 | return -EINVAL; |
18c216c5 JC |
458 | } |
459 | /* check flags 1st (last arg) so query is pairs of spec,val */ | |
460 | if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) { | |
461 | pr_err("flags parse failed\n"); | |
fd89cfb8 | 462 | return -EINVAL; |
18c216c5 JC |
463 | } |
464 | if (ddebug_parse_query(words, nwords-1, &query, modname)) { | |
465 | pr_err("query parse failed\n"); | |
fd89cfb8 | 466 | return -EINVAL; |
18c216c5 | 467 | } |
fd89cfb8 | 468 | /* actually go and implement the change */ |
85f7f6c0 | 469 | nfound = ddebug_change(&query, flags, mask); |
f657fd21 | 470 | vpr_info_dq(&query, nfound ? "applied" : "no-match"); |
85f7f6c0 JC |
471 | |
472 | return nfound; | |
473 | } | |
474 | ||
475 | /* handle multiple queries in query string, continue on error, return | |
476 | last error or number of matching callsites. Module name is either | |
477 | in param (for boot arg) or perhaps in query string. | |
478 | */ | |
8e59b5cf | 479 | static int ddebug_exec_queries(char *query, const char *modname) |
85f7f6c0 JC |
480 | { |
481 | char *split; | |
482 | int i, errs = 0, exitcode = 0, rc, nfound = 0; | |
483 | ||
484 | for (i = 0; query; query = split) { | |
485 | split = strpbrk(query, ";\n"); | |
486 | if (split) | |
487 | *split++ = '\0'; | |
488 | ||
489 | query = skip_spaces(query); | |
490 | if (!query || !*query || *query == '#') | |
491 | continue; | |
492 | ||
b8ccd5de | 493 | vpr_info("query %d: \"%s\"\n", i, query); |
85f7f6c0 | 494 | |
8e59b5cf | 495 | rc = ddebug_exec_query(query, modname); |
85f7f6c0 JC |
496 | if (rc < 0) { |
497 | errs++; | |
498 | exitcode = rc; | |
f657fd21 | 499 | } else { |
85f7f6c0 | 500 | nfound += rc; |
f657fd21 | 501 | } |
85f7f6c0 JC |
502 | i++; |
503 | } | |
b8ccd5de | 504 | vpr_info("processed %d queries, with %d matches, %d errs\n", |
85f7f6c0 JC |
505 | i, nfound, errs); |
506 | ||
507 | if (exitcode) | |
508 | return exitcode; | |
509 | return nfound; | |
fd89cfb8 TR |
510 | } |
511 | ||
431625da JB |
512 | #define PREFIX_SIZE 64 |
513 | ||
514 | static int remaining(int wrote) | |
515 | { | |
516 | if (PREFIX_SIZE - wrote > 0) | |
517 | return PREFIX_SIZE - wrote; | |
518 | return 0; | |
519 | } | |
520 | ||
521 | static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf) | |
8ba6ebf5 | 522 | { |
431625da JB |
523 | int pos_after_tid; |
524 | int pos = 0; | |
8ba6ebf5 | 525 | |
798efc60 JP |
526 | *buf = '\0'; |
527 | ||
431625da | 528 | if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
8ba6ebf5 | 529 | if (in_interrupt()) |
798efc60 | 530 | pos += snprintf(buf + pos, remaining(pos), "<intr> "); |
8ba6ebf5 | 531 | else |
431625da | 532 | pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
798efc60 | 533 | task_pid_vnr(current)); |
8ba6ebf5 | 534 | } |
431625da JB |
535 | pos_after_tid = pos; |
536 | if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) | |
537 | pos += snprintf(buf + pos, remaining(pos), "%s:", | |
798efc60 | 538 | desc->modname); |
431625da JB |
539 | if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) |
540 | pos += snprintf(buf + pos, remaining(pos), "%s:", | |
798efc60 | 541 | desc->function); |
431625da | 542 | if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
07100be7 | 543 | pos += snprintf(buf + pos, remaining(pos), "%d:", |
798efc60 | 544 | desc->lineno); |
431625da JB |
545 | if (pos - pos_after_tid) |
546 | pos += snprintf(buf + pos, remaining(pos), " "); | |
547 | if (pos >= PREFIX_SIZE) | |
548 | buf[PREFIX_SIZE - 1] = '\0'; | |
6c2140ee | 549 | |
431625da | 550 | return buf; |
6c2140ee JP |
551 | } |
552 | ||
906d2015 | 553 | void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
8ba6ebf5 BVA |
554 | { |
555 | va_list args; | |
431625da JB |
556 | struct va_format vaf; |
557 | char buf[PREFIX_SIZE]; | |
8ba6ebf5 BVA |
558 | |
559 | BUG_ON(!descriptor); | |
560 | BUG_ON(!fmt); | |
561 | ||
562 | va_start(args, fmt); | |
798efc60 | 563 | |
431625da JB |
564 | vaf.fmt = fmt; |
565 | vaf.va = &args; | |
798efc60 | 566 | |
906d2015 | 567 | printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
798efc60 | 568 | |
8ba6ebf5 | 569 | va_end(args); |
8ba6ebf5 BVA |
570 | } |
571 | EXPORT_SYMBOL(__dynamic_pr_debug); | |
572 | ||
906d2015 | 573 | void __dynamic_dev_dbg(struct _ddebug *descriptor, |
cbc46635 JP |
574 | const struct device *dev, const char *fmt, ...) |
575 | { | |
576 | struct va_format vaf; | |
577 | va_list args; | |
cbc46635 JP |
578 | |
579 | BUG_ON(!descriptor); | |
580 | BUG_ON(!fmt); | |
581 | ||
582 | va_start(args, fmt); | |
798efc60 | 583 | |
cbc46635 JP |
584 | vaf.fmt = fmt; |
585 | vaf.va = &args; | |
798efc60 JP |
586 | |
587 | if (!dev) { | |
906d2015 | 588 | printk(KERN_DEBUG "(NULL device *): %pV", &vaf); |
798efc60 JP |
589 | } else { |
590 | char buf[PREFIX_SIZE]; | |
798efc60 | 591 | |
a39d4a85 | 592 | dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV", |
906d2015 JP |
593 | dynamic_emit_prefix(descriptor, buf), |
594 | dev_driver_string(dev), dev_name(dev), | |
595 | &vaf); | |
798efc60 JP |
596 | } |
597 | ||
cbc46635 | 598 | va_end(args); |
cbc46635 JP |
599 | } |
600 | EXPORT_SYMBOL(__dynamic_dev_dbg); | |
601 | ||
0feefd97 JB |
602 | #ifdef CONFIG_NET |
603 | ||
906d2015 JP |
604 | void __dynamic_netdev_dbg(struct _ddebug *descriptor, |
605 | const struct net_device *dev, const char *fmt, ...) | |
ffa10cb4 JB |
606 | { |
607 | struct va_format vaf; | |
608 | va_list args; | |
ffa10cb4 JB |
609 | |
610 | BUG_ON(!descriptor); | |
611 | BUG_ON(!fmt); | |
612 | ||
613 | va_start(args, fmt); | |
b004ff49 | 614 | |
ffa10cb4 JB |
615 | vaf.fmt = fmt; |
616 | vaf.va = &args; | |
b004ff49 JP |
617 | |
618 | if (dev && dev->dev.parent) { | |
619 | char buf[PREFIX_SIZE]; | |
666f355f | 620 | |
a39d4a85 | 621 | dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent, |
906d2015 JP |
622 | "%s%s %s %s%s: %pV", |
623 | dynamic_emit_prefix(descriptor, buf), | |
624 | dev_driver_string(dev->dev.parent), | |
625 | dev_name(dev->dev.parent), | |
626 | netdev_name(dev), netdev_reg_state(dev), | |
627 | &vaf); | |
b004ff49 | 628 | } else if (dev) { |
906d2015 JP |
629 | printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev), |
630 | netdev_reg_state(dev), &vaf); | |
b004ff49 | 631 | } else { |
906d2015 | 632 | printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); |
b004ff49 JP |
633 | } |
634 | ||
ffa10cb4 | 635 | va_end(args); |
ffa10cb4 JB |
636 | } |
637 | EXPORT_SYMBOL(__dynamic_netdev_dbg); | |
638 | ||
0feefd97 JB |
639 | #endif |
640 | ||
923abb9d GP |
641 | #if IS_ENABLED(CONFIG_INFINIBAND) |
642 | ||
643 | void __dynamic_ibdev_dbg(struct _ddebug *descriptor, | |
644 | const struct ib_device *ibdev, const char *fmt, ...) | |
645 | { | |
646 | struct va_format vaf; | |
647 | va_list args; | |
648 | ||
649 | va_start(args, fmt); | |
650 | ||
651 | vaf.fmt = fmt; | |
652 | vaf.va = &args; | |
653 | ||
654 | if (ibdev && ibdev->dev.parent) { | |
655 | char buf[PREFIX_SIZE]; | |
656 | ||
657 | dev_printk_emit(LOGLEVEL_DEBUG, ibdev->dev.parent, | |
658 | "%s%s %s %s: %pV", | |
659 | dynamic_emit_prefix(descriptor, buf), | |
660 | dev_driver_string(ibdev->dev.parent), | |
661 | dev_name(ibdev->dev.parent), | |
662 | dev_name(&ibdev->dev), | |
663 | &vaf); | |
664 | } else if (ibdev) { | |
665 | printk(KERN_DEBUG "%s: %pV", dev_name(&ibdev->dev), &vaf); | |
666 | } else { | |
667 | printk(KERN_DEBUG "(NULL ib_device): %pV", &vaf); | |
668 | } | |
669 | ||
670 | va_end(args); | |
671 | } | |
672 | EXPORT_SYMBOL(__dynamic_ibdev_dbg); | |
673 | ||
674 | #endif | |
675 | ||
bc757f6f JC |
676 | #define DDEBUG_STRING_SIZE 1024 |
677 | static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; | |
678 | ||
a648ec05 TR |
679 | static __init int ddebug_setup_query(char *str) |
680 | { | |
bc757f6f | 681 | if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5 | 682 | pr_warn("ddebug boot param string too large\n"); |
a648ec05 TR |
683 | return 0; |
684 | } | |
bc757f6f | 685 | strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05 TR |
686 | return 1; |
687 | } | |
688 | ||
689 | __setup("ddebug_query=", ddebug_setup_query); | |
690 | ||
e9d376f0 | 691 | /* |
231821d4 | 692 | * File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the |
e9d376f0 JB |
693 | * command text from userspace, parses and executes it. |
694 | */ | |
7281491c | 695 | #define USER_BUF_PAGE 4096 |
e9d376f0 JB |
696 | static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, |
697 | size_t len, loff_t *offp) | |
698 | { | |
7281491c | 699 | char *tmpbuf; |
fd89cfb8 | 700 | int ret; |
e9d376f0 JB |
701 | |
702 | if (len == 0) | |
703 | return 0; | |
7281491c JC |
704 | if (len > USER_BUF_PAGE - 1) { |
705 | pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE); | |
e9d376f0 | 706 | return -E2BIG; |
7281491c | 707 | } |
16e5c1fc AV |
708 | tmpbuf = memdup_user_nul(ubuf, len); |
709 | if (IS_ERR(tmpbuf)) | |
710 | return PTR_ERR(tmpbuf); | |
b8ccd5de | 711 | vpr_info("read %d bytes from userspace\n", (int)len); |
e9d376f0 | 712 | |
8e59b5cf | 713 | ret = ddebug_exec_queries(tmpbuf, NULL); |
7281491c | 714 | kfree(tmpbuf); |
85f7f6c0 | 715 | if (ret < 0) |
fd89cfb8 | 716 | return ret; |
e9d376f0 JB |
717 | |
718 | *offp += len; | |
719 | return len; | |
720 | } | |
721 | ||
722 | /* | |
723 | * Set the iterator to point to the first _ddebug object | |
724 | * and return a pointer to that first object. Returns | |
725 | * NULL if there are no _ddebugs at all. | |
726 | */ | |
727 | static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter) | |
728 | { | |
729 | if (list_empty(&ddebug_tables)) { | |
730 | iter->table = NULL; | |
731 | iter->idx = 0; | |
732 | return NULL; | |
733 | } | |
734 | iter->table = list_entry(ddebug_tables.next, | |
735 | struct ddebug_table, link); | |
736 | iter->idx = 0; | |
737 | return &iter->table->ddebugs[iter->idx]; | |
738 | } | |
739 | ||
740 | /* | |
741 | * Advance the iterator to point to the next _ddebug | |
742 | * object from the one the iterator currently points at, | |
743 | * and returns a pointer to the new _ddebug. Returns | |
744 | * NULL if the iterator has seen all the _ddebugs. | |
745 | */ | |
746 | static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter) | |
747 | { | |
748 | if (iter->table == NULL) | |
749 | return NULL; | |
750 | if (++iter->idx == iter->table->num_ddebugs) { | |
751 | /* iterate to next table */ | |
752 | iter->idx = 0; | |
753 | if (list_is_last(&iter->table->link, &ddebug_tables)) { | |
754 | iter->table = NULL; | |
755 | return NULL; | |
756 | } | |
757 | iter->table = list_entry(iter->table->link.next, | |
758 | struct ddebug_table, link); | |
759 | } | |
760 | return &iter->table->ddebugs[iter->idx]; | |
761 | } | |
762 | ||
763 | /* | |
764 | * Seq_ops start method. Called at the start of every | |
765 | * read() call from userspace. Takes the ddebug_lock and | |
766 | * seeks the seq_file's iterator to the given position. | |
767 | */ | |
768 | static void *ddebug_proc_start(struct seq_file *m, loff_t *pos) | |
769 | { | |
770 | struct ddebug_iter *iter = m->private; | |
771 | struct _ddebug *dp; | |
772 | int n = *pos; | |
773 | ||
b8ccd5de | 774 | vpr_info("called m=%p *pos=%lld\n", m, (unsigned long long)*pos); |
e9d376f0 JB |
775 | |
776 | mutex_lock(&ddebug_lock); | |
777 | ||
778 | if (!n) | |
779 | return SEQ_START_TOKEN; | |
780 | if (n < 0) | |
781 | return NULL; | |
782 | dp = ddebug_iter_first(iter); | |
783 | while (dp != NULL && --n > 0) | |
784 | dp = ddebug_iter_next(iter); | |
785 | return dp; | |
786 | } | |
787 | ||
788 | /* | |
789 | * Seq_ops next method. Called several times within a read() | |
790 | * call from userspace, with ddebug_lock held. Walks to the | |
791 | * next _ddebug object with a special case for the header line. | |
792 | */ | |
793 | static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos) | |
794 | { | |
795 | struct ddebug_iter *iter = m->private; | |
796 | struct _ddebug *dp; | |
797 | ||
b8ccd5de | 798 | vpr_info("called m=%p p=%p *pos=%lld\n", |
f657fd21 | 799 | m, p, (unsigned long long)*pos); |
e9d376f0 JB |
800 | |
801 | if (p == SEQ_START_TOKEN) | |
802 | dp = ddebug_iter_first(iter); | |
803 | else | |
804 | dp = ddebug_iter_next(iter); | |
805 | ++*pos; | |
806 | return dp; | |
807 | } | |
808 | ||
809 | /* | |
810 | * Seq_ops show method. Called several times within a read() | |
811 | * call from userspace, with ddebug_lock held. Formats the | |
812 | * current _ddebug as a single human-readable line, with a | |
813 | * special case for the header line. | |
814 | */ | |
815 | static int ddebug_proc_show(struct seq_file *m, void *p) | |
816 | { | |
817 | struct ddebug_iter *iter = m->private; | |
818 | struct _ddebug *dp = p; | |
5ca7d2a6 | 819 | char flagsbuf[10]; |
e9d376f0 | 820 | |
b8ccd5de | 821 | vpr_info("called m=%p p=%p\n", m, p); |
e9d376f0 JB |
822 | |
823 | if (p == SEQ_START_TOKEN) { | |
824 | seq_puts(m, | |
f657fd21 | 825 | "# filename:lineno [module]function flags format\n"); |
e9d376f0 JB |
826 | return 0; |
827 | } | |
828 | ||
5ca7d2a6 | 829 | seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21 JP |
830 | trim_prefix(dp->filename), dp->lineno, |
831 | iter->table->mod_name, dp->function, | |
832 | ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf))); | |
e9d376f0 JB |
833 | seq_escape(m, dp->format, "\t\r\n\""); |
834 | seq_puts(m, "\"\n"); | |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
839 | /* | |
840 | * Seq_ops stop method. Called at the end of each read() | |
841 | * call from userspace. Drops ddebug_lock. | |
842 | */ | |
843 | static void ddebug_proc_stop(struct seq_file *m, void *p) | |
844 | { | |
b8ccd5de | 845 | vpr_info("called m=%p p=%p\n", m, p); |
e9d376f0 JB |
846 | mutex_unlock(&ddebug_lock); |
847 | } | |
848 | ||
849 | static const struct seq_operations ddebug_proc_seqops = { | |
850 | .start = ddebug_proc_start, | |
851 | .next = ddebug_proc_next, | |
852 | .show = ddebug_proc_show, | |
853 | .stop = ddebug_proc_stop | |
854 | }; | |
855 | ||
856 | /* | |
07100be7 JC |
857 | * File_ops->open method for <debugfs>/dynamic_debug/control. Does |
858 | * the seq_file setup dance, and also creates an iterator to walk the | |
859 | * _ddebugs. Note that we create a seq_file always, even for O_WRONLY | |
860 | * files where it's not needed, as doing so simplifies the ->release | |
861 | * method. | |
e9d376f0 JB |
862 | */ |
863 | static int ddebug_proc_open(struct inode *inode, struct file *file) | |
864 | { | |
b8ccd5de | 865 | vpr_info("called\n"); |
4bad78c5 RJ |
866 | return seq_open_private(file, &ddebug_proc_seqops, |
867 | sizeof(struct ddebug_iter)); | |
e9d376f0 JB |
868 | } |
869 | ||
870 | static const struct file_operations ddebug_proc_fops = { | |
871 | .owner = THIS_MODULE, | |
872 | .open = ddebug_proc_open, | |
873 | .read = seq_read, | |
874 | .llseek = seq_lseek, | |
875 | .release = seq_release_private, | |
876 | .write = ddebug_proc_write | |
877 | }; | |
878 | ||
239a5791 GKH |
879 | static const struct proc_ops proc_fops = { |
880 | .proc_open = ddebug_proc_open, | |
881 | .proc_read = seq_read, | |
882 | .proc_lseek = seq_lseek, | |
883 | .proc_release = seq_release_private, | |
884 | .proc_write = ddebug_proc_write | |
885 | }; | |
886 | ||
e9d376f0 JB |
887 | /* |
888 | * Allocate a new ddebug_table for the given module | |
889 | * and add it to the global list. | |
890 | */ | |
891 | int ddebug_add_module(struct _ddebug *tab, unsigned int n, | |
892 | const char *name) | |
893 | { | |
894 | struct ddebug_table *dt; | |
e9d376f0 JB |
895 | |
896 | dt = kzalloc(sizeof(*dt), GFP_KERNEL); | |
513770f5 RV |
897 | if (dt == NULL) { |
898 | pr_err("error adding module: %s\n", name); | |
e9d376f0 | 899 | return -ENOMEM; |
513770f5 | 900 | } |
cdf6d006 RV |
901 | /* |
902 | * For built-in modules, name lives in .rodata and is | |
903 | * immortal. For loaded modules, name points at the name[] | |
904 | * member of struct module, which lives at least as long as | |
905 | * this struct ddebug_table. | |
906 | */ | |
907 | dt->mod_name = name; | |
e9d376f0 | 908 | dt->num_ddebugs = n; |
e9d376f0 JB |
909 | dt->ddebugs = tab; |
910 | ||
911 | mutex_lock(&ddebug_lock); | |
912 | list_add_tail(&dt->link, &ddebug_tables); | |
913 | mutex_unlock(&ddebug_lock); | |
914 | ||
b8ccd5de | 915 | vpr_info("%u debug prints in module %s\n", n, dt->mod_name); |
e9d376f0 JB |
916 | return 0; |
917 | } | |
e9d376f0 | 918 | |
6ab676e9 JC |
919 | /* helper for ddebug_dyndbg_(boot|module)_param_cb */ |
920 | static int ddebug_dyndbg_param_cb(char *param, char *val, | |
921 | const char *modname, int on_err) | |
b48420c1 | 922 | { |
b48420c1 JC |
923 | char *sep; |
924 | ||
925 | sep = strchr(param, '.'); | |
926 | if (sep) { | |
6ab676e9 | 927 | /* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1 JC |
928 | *sep = '\0'; |
929 | modname = param; | |
930 | param = sep + 1; | |
931 | } | |
932 | if (strcmp(param, "dyndbg")) | |
6ab676e9 | 933 | return on_err; /* determined by caller */ |
b48420c1 | 934 | |
8e59b5cf JC |
935 | ddebug_exec_queries((val ? val : "+p"), modname); |
936 | ||
b48420c1 JC |
937 | return 0; /* query failure shouldnt stop module load */ |
938 | } | |
939 | ||
6ab676e9 JC |
940 | /* handle both dyndbg and $module.dyndbg params at boot */ |
941 | static int ddebug_dyndbg_boot_param_cb(char *param, char *val, | |
ecc86170 | 942 | const char *unused, void *arg) |
b48420c1 | 943 | { |
6ab676e9 JC |
944 | vpr_info("%s=\"%s\"\n", param, val); |
945 | return ddebug_dyndbg_param_cb(param, val, NULL, 0); | |
946 | } | |
b48420c1 | 947 | |
6ab676e9 JC |
948 | /* |
949 | * modprobe foo finds foo.params in boot-args, strips "foo.", and | |
950 | * passes them to load_module(). This callback gets unknown params, | |
951 | * processes dyndbg params, rejects others. | |
952 | */ | |
953 | int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module) | |
954 | { | |
955 | vpr_info("module: %s %s=\"%s\"\n", module, param, val); | |
956 | return ddebug_dyndbg_param_cb(param, val, module, -ENOENT); | |
b48420c1 JC |
957 | } |
958 | ||
e9d376f0 JB |
959 | static void ddebug_table_free(struct ddebug_table *dt) |
960 | { | |
961 | list_del_init(&dt->link); | |
e9d376f0 JB |
962 | kfree(dt); |
963 | } | |
964 | ||
965 | /* | |
966 | * Called in response to a module being unloaded. Removes | |
967 | * any ddebug_table's which point at the module. | |
968 | */ | |
ff49d74a | 969 | int ddebug_remove_module(const char *mod_name) |
e9d376f0 JB |
970 | { |
971 | struct ddebug_table *dt, *nextdt; | |
972 | int ret = -ENOENT; | |
973 | ||
b8ccd5de | 974 | vpr_info("removing module \"%s\"\n", mod_name); |
e9d376f0 JB |
975 | |
976 | mutex_lock(&ddebug_lock); | |
977 | list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) { | |
4573fe15 | 978 | if (dt->mod_name == mod_name) { |
e9d376f0 JB |
979 | ddebug_table_free(dt); |
980 | ret = 0; | |
4573fe15 | 981 | break; |
e9d376f0 JB |
982 | } |
983 | } | |
984 | mutex_unlock(&ddebug_lock); | |
985 | return ret; | |
986 | } | |
e9d376f0 JB |
987 | |
988 | static void ddebug_remove_all_tables(void) | |
989 | { | |
990 | mutex_lock(&ddebug_lock); | |
991 | while (!list_empty(&ddebug_tables)) { | |
992 | struct ddebug_table *dt = list_entry(ddebug_tables.next, | |
993 | struct ddebug_table, | |
994 | link); | |
995 | ddebug_table_free(dt); | |
996 | } | |
997 | mutex_unlock(&ddebug_lock); | |
998 | } | |
999 | ||
6a5c083d TR |
1000 | static __initdata int ddebug_init_success; |
1001 | ||
239a5791 | 1002 | static int __init dynamic_debug_init_control(void) |
e9d376f0 | 1003 | { |
239a5791 GKH |
1004 | struct proc_dir_entry *procfs_dir; |
1005 | struct dentry *debugfs_dir; | |
6a5c083d TR |
1006 | |
1007 | if (!ddebug_init_success) | |
1008 | return -ENODEV; | |
e9d376f0 | 1009 | |
239a5791 GKH |
1010 | /* Create the control file in debugfs if it is enabled */ |
1011 | if (debugfs_initialized()) { | |
1012 | debugfs_dir = debugfs_create_dir("dynamic_debug", NULL); | |
1013 | debugfs_create_file("control", 0644, debugfs_dir, NULL, | |
1014 | &ddebug_proc_fops); | |
1015 | } | |
1016 | ||
1017 | /* Also create the control file in procfs */ | |
1018 | procfs_dir = proc_mkdir("dynamic_debug", NULL); | |
1019 | if (procfs_dir) | |
1020 | proc_create("control", 0644, procfs_dir, &proc_fops); | |
9fd714cd | 1021 | |
6a5c083d TR |
1022 | return 0; |
1023 | } | |
1024 | ||
1025 | static int __init dynamic_debug_init(void) | |
1026 | { | |
1027 | struct _ddebug *iter, *iter_start; | |
1028 | const char *modname = NULL; | |
b48420c1 | 1029 | char *cmdline; |
6a5c083d | 1030 | int ret = 0; |
41076927 JC |
1031 | int n = 0, entries = 0, modct = 0; |
1032 | int verbose_bytes = 0; | |
6a5c083d | 1033 | |
8306b057 | 1034 | if (&__start___verbose == &__stop___verbose) { |
f657fd21 | 1035 | pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n"); |
b5b78f83 JC |
1036 | return 1; |
1037 | } | |
1038 | iter = __start___verbose; | |
1039 | modname = iter->modname; | |
1040 | iter_start = iter; | |
1041 | for (; iter < __stop___verbose; iter++) { | |
41076927 JC |
1042 | entries++; |
1043 | verbose_bytes += strlen(iter->modname) + strlen(iter->function) | |
1044 | + strlen(iter->filename) + strlen(iter->format); | |
1045 | ||
b5b78f83 | 1046 | if (strcmp(modname, iter->modname)) { |
41076927 | 1047 | modct++; |
b5b78f83 JC |
1048 | ret = ddebug_add_module(iter_start, n, modname); |
1049 | if (ret) | |
af442399 | 1050 | goto out_err; |
b5b78f83 JC |
1051 | n = 0; |
1052 | modname = iter->modname; | |
1053 | iter_start = iter; | |
e9d376f0 | 1054 | } |
b5b78f83 | 1055 | n++; |
e9d376f0 | 1056 | } |
b5b78f83 JC |
1057 | ret = ddebug_add_module(iter_start, n, modname); |
1058 | if (ret) | |
af442399 | 1059 | goto out_err; |
a648ec05 | 1060 | |
af442399 | 1061 | ddebug_init_success = 1; |
f657fd21 JP |
1062 | vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in (readonly) verbose section\n", |
1063 | modct, entries, (int)(modct * sizeof(struct ddebug_table)), | |
1064 | verbose_bytes + (int)(__stop___verbose - __start___verbose)); | |
af442399 JC |
1065 | |
1066 | /* apply ddebug_query boot param, dont unload tables on err */ | |
a648ec05 | 1067 | if (ddebug_setup_string[0] != '\0') { |
f657fd21 | 1068 | pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n"); |
8e59b5cf | 1069 | ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0 | 1070 | if (ret < 0) |
f657fd21 | 1071 | pr_warn("Invalid ddebug boot param %s\n", |
4ad275e5 | 1072 | ddebug_setup_string); |
a648ec05 | 1073 | else |
85f7f6c0 | 1074 | pr_info("%d changes by ddebug_query\n", ret); |
a648ec05 | 1075 | } |
b48420c1 JC |
1076 | /* now that ddebug tables are loaded, process all boot args |
1077 | * again to find and activate queries given in dyndbg params. | |
1078 | * While this has already been done for known boot params, it | |
1079 | * ignored the unknown ones (dyndbg in particular). Reusing | |
1080 | * parse_args avoids ad-hoc parsing. This will also attempt | |
1081 | * to activate queries for not-yet-loaded modules, which is | |
1082 | * slightly noisy if verbose, but harmless. | |
1083 | */ | |
1084 | cmdline = kstrdup(saved_command_line, GFP_KERNEL); | |
1085 | parse_args("dyndbg params", cmdline, NULL, | |
ecc86170 | 1086 | 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb); |
b48420c1 | 1087 | kfree(cmdline); |
af442399 | 1088 | return 0; |
a648ec05 | 1089 | |
af442399 JC |
1090 | out_err: |
1091 | ddebug_remove_all_tables(); | |
e9d376f0 JB |
1092 | return 0; |
1093 | } | |
6a5c083d | 1094 | /* Allow early initialization for boot messages via boot param */ |
3ec5652a | 1095 | early_initcall(dynamic_debug_init); |
b48420c1 | 1096 | |
6a5c083d | 1097 | /* Debugfs setup must be done later */ |
239a5791 | 1098 | fs_initcall(dynamic_debug_init_control); |