Blame view
lib/dynamic_debug.c
27.9 KB
e9d376f0f dynamic debug: co... |
1 2 3 4 5 6 7 8 9 |
/* * lib/dynamic_debug.c * * make pr_debug()/dev_dbg() calls runtime configurable based upon their * source module. * * Copyright (C) 2008 Jason Baron <jbaron@redhat.com> * By Greg Banks <gnb@melbourne.sgi.com> * Copyright (c) 2008 Silicon Graphics Inc. All Rights Reserved. |
8ba6ebf58 Dynamic debug: Ad... |
10 |
* Copyright (C) 2011 Bart Van Assche. All Rights Reserved. |
578b1e070 dynamic_debug: ad... |
11 |
* Copyright (C) 2013 Du, Changbin <changbin.du@gmail.com> |
e9d376f0f dynamic debug: co... |
12 |
*/ |
5aa9ffbba dyndbg: shorten o... |
13 |
#define pr_fmt(fmt) "dyndbg: " fmt |
4ad275e5c dynamic_debug: Co... |
14 |
|
e9d376f0f dynamic debug: co... |
15 16 |
#include <linux/kernel.h> #include <linux/module.h> |
fef15d2f3 Revert "dynamic_d... |
17 18 19 |
#include <linux/moduleparam.h> #include <linux/kallsyms.h> #include <linux/types.h> |
e9d376f0f dynamic debug: co... |
20 |
#include <linux/mutex.h> |
fef15d2f3 Revert "dynamic_d... |
21 |
#include <linux/proc_fs.h> |
e9d376f0f dynamic debug: co... |
22 |
#include <linux/seq_file.h> |
fef15d2f3 Revert "dynamic_d... |
23 24 |
#include <linux/list.h> #include <linux/sysctl.h> |
e9d376f0f dynamic debug: co... |
25 |
#include <linux/ctype.h> |
fef15d2f3 Revert "dynamic_d... |
26 |
#include <linux/string.h> |
578b1e070 dynamic_debug: ad... |
27 |
#include <linux/parser.h> |
d338b1379 dynamic_debug: re... |
28 |
#include <linux/string_helpers.h> |
fef15d2f3 Revert "dynamic_d... |
29 |
#include <linux/uaccess.h> |
e9d376f0f dynamic debug: co... |
30 31 |
#include <linux/dynamic_debug.h> #include <linux/debugfs.h> |
5a0e3ad6a include cleanup: ... |
32 |
#include <linux/slab.h> |
fef15d2f3 Revert "dynamic_d... |
33 |
#include <linux/jump_label.h> |
8ba6ebf58 Dynamic debug: Ad... |
34 |
#include <linux/hardirq.h> |
e8d9792aa dynamic_debug: ad... |
35 |
#include <linux/sched.h> |
fef15d2f3 Revert "dynamic_d... |
36 |
#include <linux/device.h> |
ffa10cb47 dynamic_debug: ma... |
37 |
#include <linux/netdevice.h> |
e9d376f0f dynamic debug: co... |
38 |
|
923abb9d7 RDMA/core: Introd... |
39 |
#include <rdma/ib_verbs.h> |
e5ebffe18 dyndbg: rename __... |
40 41 |
extern struct _ddebug __start___dyndbg[]; extern struct _ddebug __stop___dyndbg[]; |
e9d376f0f dynamic debug: co... |
42 |
|
e9d376f0f dynamic debug: co... |
43 44 |
struct ddebug_table { struct list_head link; |
3e406b1d7 lib/dynamic_debug... |
45 |
const char *mod_name; |
e9d376f0f dynamic debug: co... |
46 |
unsigned int num_ddebugs; |
e9d376f0f dynamic debug: co... |
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 |
struct _ddebug *ddebugs; }; struct ddebug_query { const char *filename; const char *module; const char *function; const char *format; unsigned int first_lineno, last_lineno; }; struct ddebug_iter { struct ddebug_table *table; unsigned int idx; }; |
84da83a6f dyndbg: combine f... |
62 63 64 65 |
struct flag_settings { unsigned int flags; unsigned int mask; }; |
e9d376f0f dynamic debug: co... |
66 67 |
static DEFINE_MUTEX(ddebug_lock); static LIST_HEAD(ddebug_tables); |
f657fd21e dynamic_debug: Fi... |
68 |
static int verbose; |
74df138d5 dynamic_debug: ch... |
69 |
module_param(verbose, int, 0644); |
e9d376f0f dynamic debug: co... |
70 |
|
2b6783191 dynamic_debug: ad... |
71 72 73 74 75 76 77 78 79 80 |
/* Return the path relative to source root */ static inline const char *trim_prefix(const char *path) { int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c"); if (strncmp(path, __FILE__, skip)) skip = 0; /* prefix mismatch, don't skip */ return path + skip; } |
8ba6ebf58 Dynamic debug: Ad... |
81 82 83 84 85 86 |
static struct { unsigned flag:8; char opt_char; } opt_array[] = { { _DPRINTK_FLAGS_PRINT, 'p' }, { _DPRINTK_FLAGS_INCL_MODNAME, 'm' }, { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' }, { _DPRINTK_FLAGS_INCL_LINENO, 'l' }, { _DPRINTK_FLAGS_INCL_TID, 't' }, |
5ca7d2a6c dynamic_debug: de... |
87 |
{ _DPRINTK_FLAGS_NONE, '_' }, |
8ba6ebf58 Dynamic debug: Ad... |
88 |
}; |
f678ce8cc dyndbg: fix a BUG... |
89 |
struct flagsbuf { char buf[ARRAY_SIZE(opt_array)+1]; }; |
e9d376f0f dynamic debug: co... |
90 |
/* format a string into buf[] which describes the _ddebug's flags */ |
f678ce8cc dyndbg: fix a BUG... |
91 |
static char *ddebug_describe_flags(unsigned int flags, struct flagsbuf *fb) |
e9d376f0f dynamic debug: co... |
92 |
{ |
f678ce8cc dyndbg: fix a BUG... |
93 |
char *p = fb->buf; |
8ba6ebf58 Dynamic debug: Ad... |
94 |
int i; |
e9d376f0f dynamic debug: co... |
95 |
|
8ba6ebf58 Dynamic debug: Ad... |
96 |
for (i = 0; i < ARRAY_SIZE(opt_array); ++i) |
f678ce8cc dyndbg: fix a BUG... |
97 |
if (flags & opt_array[i].flag) |
8ba6ebf58 Dynamic debug: Ad... |
98 |
*p++ = opt_array[i].opt_char; |
f678ce8cc dyndbg: fix a BUG... |
99 |
if (p == fb->buf) |
5ca7d2a6c dynamic_debug: de... |
100 |
*p++ = '_'; |
e9d376f0f dynamic debug: co... |
101 |
*p = '\0'; |
f678ce8cc dyndbg: fix a BUG... |
102 |
return fb->buf; |
e9d376f0f dynamic debug: co... |
103 |
} |
481c0e33f dyndbg: refine de... |
104 |
#define vnpr_info(lvl, fmt, ...) \ |
b8ccd5dee dynamic_debug: re... |
105 |
do { \ |
481c0e33f dyndbg: refine de... |
106 |
if (verbose >= lvl) \ |
f657fd21e dynamic_debug: Fi... |
107 |
pr_info(fmt, ##__VA_ARGS__); \ |
574b3725e dynamic_debug: fa... |
108 |
} while (0) |
481c0e33f dyndbg: refine de... |
109 110 |
#define vpr_info(fmt, ...) vnpr_info(1, fmt, ##__VA_ARGS__) #define v2pr_info(fmt, ...) vnpr_info(2, fmt, ##__VA_ARGS__) |
f657fd21e dynamic_debug: Fi... |
111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 |
static void vpr_info_dq(const struct ddebug_query *query, const char *msg) { /* trim any trailing newlines */ int fmtlen = 0; if (query->format) { fmtlen = strlen(query->format); while (fmtlen && query->format[fmtlen - 1] == ' ') fmtlen--; } vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u ", msg, |
f62fc08fd dyndbg: use gcc ?... |
126 127 128 129 |
query->function ?: "", query->filename ?: "", query->module ?: "", fmtlen, query->format ?: "", |
f657fd21e dynamic_debug: Fi... |
130 131 |
query->first_lineno, query->last_lineno); } |
e9d376f0f dynamic debug: co... |
132 |
/* |
85f7f6c0e dynamic_debug: pr... |
133 134 135 136 |
* Search the tables for _ddebug's which match the given `query' and * apply the `flags' and `mask' to them. Returns number of matching * callsites, normally the same as number of changes. If verbose, * logs the changes. Takes ddebug_lock. |
e9d376f0f dynamic debug: co... |
137 |
*/ |
85f7f6c0e dynamic_debug: pr... |
138 |
static int ddebug_change(const struct ddebug_query *query, |
84da83a6f dyndbg: combine f... |
139 |
struct flag_settings *modifiers) |
e9d376f0f dynamic debug: co... |
140 141 142 143 144 |
{ int i; struct ddebug_table *dt; unsigned int newflags; unsigned int nfound = 0; |
f678ce8cc dyndbg: fix a BUG... |
145 |
struct flagsbuf fbuf; |
e9d376f0f dynamic debug: co... |
146 147 148 149 150 151 |
/* search for matching ddebugs */ mutex_lock(&ddebug_lock); list_for_each_entry(dt, &ddebug_tables, link) { /* match against the module name */ |
578b1e070 dynamic_debug: ad... |
152 153 |
if (query->module && !match_wildcard(query->module, dt->mod_name)) |
e9d376f0f dynamic debug: co... |
154 |
continue; |
f657fd21e dynamic_debug: Fi... |
155 |
for (i = 0; i < dt->num_ddebugs; i++) { |
e9d376f0f dynamic debug: co... |
156 157 158 |
struct _ddebug *dp = &dt->ddebugs[i]; /* match against the source filename */ |
d6a238d25 dynamic_debug: dr... |
159 |
if (query->filename && |
578b1e070 dynamic_debug: ad... |
160 161 162 163 164 |
!match_wildcard(query->filename, dp->filename) && !match_wildcard(query->filename, kbasename(dp->filename)) && !match_wildcard(query->filename, trim_prefix(dp->filename))) |
e9d376f0f dynamic debug: co... |
165 166 167 |
continue; /* match against the function */ |
d6a238d25 dynamic_debug: dr... |
168 |
if (query->function && |
578b1e070 dynamic_debug: ad... |
169 |
!match_wildcard(query->function, dp->function)) |
e9d376f0f dynamic debug: co... |
170 171 172 |
continue; /* match against the format */ |
4b334484f dyndbg: allow anc... |
173 174 175 176 177 178 179 180 181 182 |
if (query->format) { if (*query->format == '^') { char *p; /* anchored search. match must be at beginning */ p = strstr(dp->format, query->format+1); if (p != dp->format) continue; } else if (!strstr(dp->format, query->format)) continue; } |
e9d376f0f dynamic debug: co... |
183 184 185 186 187 188 189 190 191 192 |
/* match against the line number range */ if (query->first_lineno && dp->lineno < query->first_lineno) continue; if (query->last_lineno && dp->lineno > query->last_lineno) continue; nfound++; |
84da83a6f dyndbg: combine f... |
193 |
newflags = (dp->flags & modifiers->mask) | modifiers->flags; |
e9d376f0f dynamic debug: co... |
194 195 |
if (newflags == dp->flags) continue; |
e9666d10a jump_label: move ... |
196 |
#ifdef CONFIG_JUMP_LABEL |
9049fc745 dynamic_debug: ad... |
197 |
if (dp->flags & _DPRINTK_FLAGS_PRINT) { |
84da83a6f dyndbg: combine f... |
198 |
if (!(modifiers->flags & _DPRINTK_FLAGS_PRINT)) |
9049fc745 dynamic_debug: ad... |
199 |
static_branch_disable(&dp->key.dd_key_true); |
84da83a6f dyndbg: combine f... |
200 |
} else if (modifiers->flags & _DPRINTK_FLAGS_PRINT) |
9049fc745 dynamic_debug: ad... |
201 202 |
static_branch_enable(&dp->key.dd_key_true); #endif |
e9d376f0f dynamic debug: co... |
203 |
dp->flags = newflags; |
481c0e33f dyndbg: refine de... |
204 205 |
v2pr_info("changed %s:%d [%s]%s =%s ", |
f657fd21e dynamic_debug: Fi... |
206 207 |
trim_prefix(dp->filename), dp->lineno, dt->mod_name, dp->function, |
f678ce8cc dyndbg: fix a BUG... |
208 |
ddebug_describe_flags(dp->flags, &fbuf)); |
e9d376f0f dynamic debug: co... |
209 210 211 212 213 |
} } mutex_unlock(&ddebug_lock); if (!nfound && verbose) |
4ad275e5c dynamic_debug: Co... |
214 215 |
pr_info("no matches for query "); |
85f7f6c0e dynamic_debug: pr... |
216 217 |
return nfound; |
e9d376f0f dynamic debug: co... |
218 219 220 |
} /* |
e9d376f0f dynamic debug: co... |
221 |
* Split the buffer `buf' into space-separated words. |
9898abb3d Dynamic debug: al... |
222 223 224 |
* Handles simple " and ' quoting, i.e. without nested, * embedded or escaped \". Return the number of words * or <0 on error. |
e9d376f0f dynamic debug: co... |
225 226 227 228 |
*/ static int ddebug_tokenize(char *buf, char *words[], int maxwords) { int nwords = 0; |
9898abb3d Dynamic debug: al... |
229 230 231 232 |
while (*buf) { char *end; /* Skip leading whitespace */ |
e7d2860b6 tree-wide: conver... |
233 |
buf = skip_spaces(buf); |
9898abb3d Dynamic debug: al... |
234 235 |
if (!*buf) break; /* oh, it was trailing whitespace */ |
8bd6026e8 dynamic_debug: ch... |
236 237 |
if (*buf == '#') break; /* token starts comment, skip rest of line */ |
9898abb3d Dynamic debug: al... |
238 |
|
07100be7e dynamic_debug: fi... |
239 |
/* find `end' of word, whitespace separated or quoted */ |
9898abb3d Dynamic debug: al... |
240 241 |
if (*buf == '"' || *buf == '\'') { int quote = *buf++; |
f657fd21e dynamic_debug: Fi... |
242 |
for (end = buf; *end && *end != quote; end++) |
9898abb3d Dynamic debug: al... |
243 |
; |
18c216c53 dynamic_debug: ad... |
244 245 246 |
if (!*end) { pr_err("unclosed quote: %s ", buf); |
9898abb3d Dynamic debug: al... |
247 |
return -EINVAL; /* unclosed quote */ |
18c216c53 dynamic_debug: ad... |
248 |
} |
9898abb3d Dynamic debug: al... |
249 |
} else { |
7f6e1f307 Revert "dyndbg: f... |
250 |
for (end = buf; *end && !isspace(*end); end++) |
9898abb3d Dynamic debug: al... |
251 252 253 |
; BUG_ON(end == buf); } |
9898abb3d Dynamic debug: al... |
254 |
|
07100be7e dynamic_debug: fi... |
255 |
/* `buf' is start of word, `end' is one past its end */ |
18c216c53 dynamic_debug: ad... |
256 257 258 |
if (nwords == maxwords) { pr_err("too many words, legal max <=%d ", maxwords); |
9898abb3d Dynamic debug: al... |
259 |
return -EINVAL; /* ran out of words[] before bytes */ |
18c216c53 dynamic_debug: ad... |
260 |
} |
9898abb3d Dynamic debug: al... |
261 262 263 264 265 |
if (*end) *end++ = '\0'; /* terminate the word */ words[nwords++] = buf; buf = end; } |
e9d376f0f dynamic debug: co... |
266 267 268 |
if (verbose) { int i; |
4ad275e5c dynamic_debug: Co... |
269 |
pr_info("split into words:"); |
f657fd21e dynamic_debug: Fi... |
270 |
for (i = 0; i < nwords; i++) |
4ad275e5c dynamic_debug: Co... |
271 272 273 |
pr_cont(" \"%s\"", words[i]); pr_cont(" "); |
e9d376f0f dynamic debug: co... |
274 275 276 277 278 279 280 281 282 283 284 285 |
} return nwords; } /* * Parse a single line number. Note that the empty string "" * is treated as a special case and converted to zero, which * is later treated as a "don't care" value. */ static inline int parse_lineno(const char *str, unsigned int *val) { |
e9d376f0f dynamic debug: co... |
286 287 288 289 290 |
BUG_ON(str == NULL); if (*str == '\0') { *val = 0; return 0; } |
4592599af dynamic_debug: re... |
291 |
if (kstrtouint(str, 10, val) < 0) { |
18c216c53 dynamic_debug: ad... |
292 293 294 295 296 |
pr_err("bad line-number: %s ", str); return -EINVAL; } return 0; |
e9d376f0f dynamic debug: co... |
297 |
} |
8037072d8 dyndbg: refactor ... |
298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 |
static int parse_linerange(struct ddebug_query *query, const char *first) { char *last = strchr(first, '-'); if (query->first_lineno || query->last_lineno) { pr_err("match-spec: line used 2x "); return -EINVAL; } if (last) *last++ = '\0'; if (parse_lineno(first, &query->first_lineno) < 0) return -EINVAL; if (last) { /* range <first>-<last> */ if (parse_lineno(last, &query->last_lineno) < 0) return -EINVAL; /* special case for last lineno not specified */ if (query->last_lineno == 0) query->last_lineno = UINT_MAX; if (query->last_lineno < query->first_lineno) { pr_err("last-line:%d < 1st-line:%d ", query->last_lineno, query->first_lineno); return -EINVAL; } } else { query->last_lineno = query->first_lineno; } vpr_info("parsed line %d-%d ", query->first_lineno, query->last_lineno); return 0; } |
820874c75 dynamic_debug: ti... |
335 336 337 338 339 340 |
static int check_set(const char **dest, char *src, char *name) { int rc = 0; if (*dest) { rc = -EINVAL; |
f657fd21e dynamic_debug: Fi... |
341 342 343 |
pr_err("match-spec:%s val:%s overridden by %s ", name, *dest, src); |
820874c75 dynamic_debug: ti... |
344 345 346 347 |
} *dest = src; return rc; } |
e9d376f0f dynamic debug: co... |
348 349 |
/* * Parse words[] as a ddebug query specification, which is a series |
952e934d7 Revert "dyndbg: a... |
350 |
* of (keyword, value) pairs chosen from these possibilities: |
e9d376f0f dynamic debug: co... |
351 352 353 354 355 356 357 358 |
* * func <function-name> * file <full-pathname> * file <base-filename> * module <module-name> * format <escaped-string-to-find-in-format> * line <lineno> * line <first-lineno>-<last-lineno> // where either may be empty |
820874c75 dynamic_debug: ti... |
359 360 361 |
* * Only 1 of each type is allowed. * Returns 0 on success, <0 on error. |
e9d376f0f dynamic debug: co... |
362 363 |
*/ static int ddebug_parse_query(char *words[], int nwords, |
8e59b5cfb dynamic_debug: ad... |
364 |
struct ddebug_query *query, const char *modname) |
e9d376f0f dynamic debug: co... |
365 366 |
{ unsigned int i; |
bd8c154a6 dynamic debug: li... |
367 |
int rc = 0; |
aaebe329b dyndbg: accept 'f... |
368 |
char *fline; |
952e934d7 Revert "dyndbg: a... |
369 370 371 372 373 374 375 |
/* check we have an even number of words */ if (nwords % 2 != 0) { pr_err("expecting pairs of match-spec <value> "); return -EINVAL; } |
e9d376f0f dynamic debug: co... |
376 |
|
7f6e1f307 Revert "dyndbg: f... |
377 |
if (modname) |
8e59b5cfb dynamic_debug: ad... |
378 379 |
/* support $modname.dyndbg=<multiple queries> */ query->module = modname; |
952e934d7 Revert "dyndbg: a... |
380 |
for (i = 0; i < nwords; i += 2) { |
e5e5fcef6 dyndbg: use keywo... |
381 382 383 384 385 386 387 |
char *keyword = words[i]; char *arg = words[i+1]; if (!strcmp(keyword, "func")) { rc = check_set(&query->function, arg, "func"); } else if (!strcmp(keyword, "file")) { if (check_set(&query->filename, arg, "file")) |
aaebe329b dyndbg: accept 'f... |
388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 |
return -EINVAL; /* tail :$info is function or line-range */ fline = strchr(query->filename, ':'); if (!fline) break; *fline++ = '\0'; if (isalpha(*fline) || *fline == '*' || *fline == '?') { /* take as function name */ if (check_set(&query->function, fline, "func")) return -EINVAL; } else { if (parse_linerange(query, fline)) return -EINVAL; } |
e5e5fcef6 dyndbg: use keywo... |
403 404 405 406 |
} else if (!strcmp(keyword, "module")) { rc = check_set(&query->module, arg, "module"); } else if (!strcmp(keyword, "format")) { string_unescape_inplace(arg, UNESCAPE_SPACE | |
d338b1379 dynamic_debug: re... |
407 408 |
UNESCAPE_OCTAL | UNESCAPE_SPECIAL); |
e5e5fcef6 dyndbg: use keywo... |
409 410 411 |
rc = check_set(&query->format, arg, "format"); } else if (!strcmp(keyword, "line")) { if (parse_linerange(query, arg)) |
e9d376f0f dynamic debug: co... |
412 |
return -EINVAL; |
e9d376f0f dynamic debug: co... |
413 |
} else { |
e5e5fcef6 dyndbg: use keywo... |
414 415 |
pr_err("unknown keyword \"%s\" ", keyword); |
e9d376f0f dynamic debug: co... |
416 417 |
return -EINVAL; } |
820874c75 dynamic_debug: ti... |
418 419 |
if (rc) return rc; |
e9d376f0f dynamic debug: co... |
420 |
} |
574b3725e dynamic_debug: fa... |
421 |
vpr_info_dq(query, "parsed"); |
e9d376f0f dynamic debug: co... |
422 423 424 425 426 427 428 429 430 |
return 0; } /* * Parse `str' as a flags specification, format [-+=][p]+. * Sets up *maskp and *flagsp to be used when changing the * flags fields of matched _ddebug's. Returns 0 on success * or <0 on error. */ |
84da83a6f dyndbg: combine f... |
431 |
static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers) |
e9d376f0f dynamic debug: co... |
432 |
{ |
84da83a6f dyndbg: combine f... |
433 |
int op, i; |
e9d376f0f dynamic debug: co... |
434 435 436 437 438 439 440 441 |
switch (*str) { case '+': case '-': case '=': op = *str++; break; default: |
18c216c53 dynamic_debug: ad... |
442 443 |
pr_err("bad flag-op %c, at start of %s ", *str, str); |
e9d376f0f dynamic debug: co... |
444 445 |
return -EINVAL; } |
b8ccd5dee dynamic_debug: re... |
446 447 |
vpr_info("op='%c' ", op); |
e9d376f0f dynamic debug: co... |
448 |
|
f657fd21e dynamic_debug: Fi... |
449 |
for (; *str ; ++str) { |
8ba6ebf58 Dynamic debug: Ad... |
450 451 |
for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) { if (*str == opt_array[i].opt_char) { |
84da83a6f dyndbg: combine f... |
452 |
modifiers->flags |= opt_array[i].flag; |
8ba6ebf58 Dynamic debug: Ad... |
453 454 |
break; } |
e9d376f0f dynamic debug: co... |
455 |
} |
18c216c53 dynamic_debug: ad... |
456 |
if (i < 0) { |
0b8f96be9 dyndbg: fix pr_er... |
457 458 |
pr_err("unknown flag '%c' ", *str); |
8ba6ebf58 Dynamic debug: Ad... |
459 |
return -EINVAL; |
18c216c53 dynamic_debug: ad... |
460 |
} |
e9d376f0f dynamic debug: co... |
461 |
} |
84da83a6f dyndbg: combine f... |
462 463 |
vpr_info("flags=0x%x ", modifiers->flags); |
e9d376f0f dynamic debug: co... |
464 |
|
84da83a6f dyndbg: combine f... |
465 |
/* calculate final flags, mask based upon op */ |
e9d376f0f dynamic debug: co... |
466 467 |
switch (op) { case '=': |
84da83a6f dyndbg: combine f... |
468 469 |
/* modifiers->flags already set */ modifiers->mask = 0; |
e9d376f0f dynamic debug: co... |
470 471 |
break; case '+': |
84da83a6f dyndbg: combine f... |
472 |
modifiers->mask = ~0U; |
e9d376f0f dynamic debug: co... |
473 474 |
break; case '-': |
84da83a6f dyndbg: combine f... |
475 476 |
modifiers->mask = ~modifiers->flags; modifiers->flags = 0; |
e9d376f0f dynamic debug: co... |
477 478 |
break; } |
84da83a6f dyndbg: combine f... |
479 480 |
vpr_info("*flagsp=0x%x *maskp=0x%x ", modifiers->flags, modifiers->mask); |
e9d376f0f dynamic debug: co... |
481 482 |
return 0; } |
8e59b5cfb dynamic_debug: ad... |
483 |
static int ddebug_exec_query(char *query_string, const char *modname) |
fd89cfb87 Dynamic Debug: Sp... |
484 |
{ |
84da83a6f dyndbg: combine f... |
485 |
struct flag_settings modifiers = {}; |
9c9d0acbe dyndbg: prefer de... |
486 |
struct ddebug_query query = {}; |
fd89cfb87 Dynamic Debug: Sp... |
487 |
#define MAXWORDS 9 |
85f7f6c0e dynamic_debug: pr... |
488 |
int nwords, nfound; |
fd89cfb87 Dynamic Debug: Sp... |
489 490 491 |
char *words[MAXWORDS]; nwords = ddebug_tokenize(query_string, words, MAXWORDS); |
18c216c53 dynamic_debug: ad... |
492 493 494 |
if (nwords <= 0) { pr_err("tokenize failed "); |
fd89cfb87 Dynamic Debug: Sp... |
495 |
return -EINVAL; |
18c216c53 dynamic_debug: ad... |
496 497 |
} /* check flags 1st (last arg) so query is pairs of spec,val */ |
84da83a6f dyndbg: combine f... |
498 |
if (ddebug_parse_flags(words[nwords-1], &modifiers)) { |
18c216c53 dynamic_debug: ad... |
499 500 |
pr_err("flags parse failed "); |
fd89cfb87 Dynamic Debug: Sp... |
501 |
return -EINVAL; |
18c216c53 dynamic_debug: ad... |
502 503 504 505 |
} if (ddebug_parse_query(words, nwords-1, &query, modname)) { pr_err("query parse failed "); |
fd89cfb87 Dynamic Debug: Sp... |
506 |
return -EINVAL; |
18c216c53 dynamic_debug: ad... |
507 |
} |
fd89cfb87 Dynamic Debug: Sp... |
508 |
/* actually go and implement the change */ |
84da83a6f dyndbg: combine f... |
509 |
nfound = ddebug_change(&query, &modifiers); |
f657fd21e dynamic_debug: Fi... |
510 |
vpr_info_dq(&query, nfound ? "applied" : "no-match"); |
85f7f6c0e dynamic_debug: pr... |
511 512 513 514 515 516 517 518 |
return nfound; } /* handle multiple queries in query string, continue on error, return last error or number of matching callsites. Module name is either in param (for boot arg) or perhaps in query string. */ |
a2d375eda dyndbg: refine ex... |
519 |
static int ddebug_exec_queries(char *query, const char *modname) |
85f7f6c0e dynamic_debug: pr... |
520 521 522 523 524 525 526 527 528 529 530 531 532 |
{ char *split; int i, errs = 0, exitcode = 0, rc, nfound = 0; for (i = 0; query; query = split) { split = strpbrk(query, "; "); if (split) *split++ = '\0'; query = skip_spaces(query); if (!query || !*query || *query == '#') continue; |
b8ccd5dee dynamic_debug: re... |
533 534 |
vpr_info("query %d: \"%s\" ", i, query); |
85f7f6c0e dynamic_debug: pr... |
535 |
|
8e59b5cfb dynamic_debug: ad... |
536 |
rc = ddebug_exec_query(query, modname); |
85f7f6c0e dynamic_debug: pr... |
537 538 539 |
if (rc < 0) { errs++; exitcode = rc; |
f657fd21e dynamic_debug: Fi... |
540 |
} else { |
85f7f6c0e dynamic_debug: pr... |
541 |
nfound += rc; |
f657fd21e dynamic_debug: Fi... |
542 |
} |
85f7f6c0e dynamic_debug: pr... |
543 544 |
i++; } |
b8ccd5dee dynamic_debug: re... |
545 546 |
vpr_info("processed %d queries, with %d matches, %d errs ", |
85f7f6c0e dynamic_debug: pr... |
547 548 549 550 551 |
i, nfound, errs); if (exitcode) return exitcode; return nfound; |
fd89cfb87 Dynamic Debug: Sp... |
552 |
} |
a2d375eda dyndbg: refine ex... |
553 554 555 556 557 558 559 560 561 562 563 564 565 566 |
/** * dynamic_debug_exec_queries - select and change dynamic-debug prints * @query: query-string described in admin-guide/dynamic-debug-howto * @modname: string containing module name, usually &module.mod_name * * This uses the >/proc/dynamic_debug/control reader, allowing module * authors to modify their dynamic-debug callsites. The modname is * canonically struct module.mod_name, but can also be null or a * module-wildcard, for example: "drm*". */ int dynamic_debug_exec_queries(const char *query, const char *modname) { int rc; |
fe9db435d dyndbg: fix use b... |
567 |
char *qry; /* writable copy of query */ |
a2d375eda dyndbg: refine ex... |
568 |
|
fe9db435d dyndbg: fix use b... |
569 570 571 572 573 574 575 |
if (!query) { pr_err("non-null query/command string expected "); return -EINVAL; } qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL); if (!qry) |
a2d375eda dyndbg: refine ex... |
576 577 578 579 580 581 582 |
return -ENOMEM; rc = ddebug_exec_queries(qry, modname); kfree(qry); return rc; } EXPORT_SYMBOL_GPL(dynamic_debug_exec_queries); |
fd89cfb87 Dynamic Debug: Sp... |
583 |
|
431625dac dynamic_debug: us... |
584 585 586 587 588 589 590 591 592 593 |
#define PREFIX_SIZE 64 static int remaining(int wrote) { if (PREFIX_SIZE - wrote > 0) return PREFIX_SIZE - wrote; return 0; } static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf) |
8ba6ebf58 Dynamic debug: Ad... |
594 |
{ |
431625dac dynamic_debug: us... |
595 596 |
int pos_after_tid; int pos = 0; |
8ba6ebf58 Dynamic debug: Ad... |
597 |
|
798efc60e dev_dbg/dynamic_d... |
598 |
*buf = '\0'; |
431625dac dynamic_debug: us... |
599 |
if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
8ba6ebf58 Dynamic debug: Ad... |
600 |
if (in_interrupt()) |
798efc60e dev_dbg/dynamic_d... |
601 |
pos += snprintf(buf + pos, remaining(pos), "<intr> "); |
8ba6ebf58 Dynamic debug: Ad... |
602 |
else |
431625dac dynamic_debug: us... |
603 |
pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
798efc60e dev_dbg/dynamic_d... |
604 |
task_pid_vnr(current)); |
8ba6ebf58 Dynamic debug: Ad... |
605 |
} |
431625dac dynamic_debug: us... |
606 607 608 |
pos_after_tid = pos; if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
798efc60e dev_dbg/dynamic_d... |
609 |
desc->modname); |
431625dac dynamic_debug: us... |
610 611 |
if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
798efc60e dev_dbg/dynamic_d... |
612 |
desc->function); |
431625dac dynamic_debug: us... |
613 |
if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
07100be7e dynamic_debug: fi... |
614 |
pos += snprintf(buf + pos, remaining(pos), "%d:", |
798efc60e dev_dbg/dynamic_d... |
615 |
desc->lineno); |
431625dac dynamic_debug: us... |
616 617 618 619 |
if (pos - pos_after_tid) pos += snprintf(buf + pos, remaining(pos), " "); if (pos >= PREFIX_SIZE) buf[PREFIX_SIZE - 1] = '\0'; |
6c2140ee0 dynamic_debug: Co... |
620 |
|
431625dac dynamic_debug: us... |
621 |
return buf; |
6c2140ee0 dynamic_debug: Co... |
622 |
} |
906d20153 dynamic_debug: ch... |
623 |
void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
8ba6ebf58 Dynamic debug: Ad... |
624 625 |
{ va_list args; |
431625dac dynamic_debug: us... |
626 627 |
struct va_format vaf; char buf[PREFIX_SIZE]; |
8ba6ebf58 Dynamic debug: Ad... |
628 629 630 631 632 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e dev_dbg/dynamic_d... |
633 |
|
431625dac dynamic_debug: us... |
634 635 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e dev_dbg/dynamic_d... |
636 |
|
906d20153 dynamic_debug: ch... |
637 |
printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
798efc60e dev_dbg/dynamic_d... |
638 |
|
8ba6ebf58 Dynamic debug: Ad... |
639 |
va_end(args); |
8ba6ebf58 Dynamic debug: Ad... |
640 641 |
} EXPORT_SYMBOL(__dynamic_pr_debug); |
906d20153 dynamic_debug: ch... |
642 |
void __dynamic_dev_dbg(struct _ddebug *descriptor, |
cbc466355 dynamic_debug: Ad... |
643 644 645 646 |
const struct device *dev, const char *fmt, ...) { struct va_format vaf; va_list args; |
cbc466355 dynamic_debug: Ad... |
647 648 649 650 651 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e dev_dbg/dynamic_d... |
652 |
|
cbc466355 dynamic_debug: Ad... |
653 654 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e dev_dbg/dynamic_d... |
655 656 |
if (!dev) { |
906d20153 dynamic_debug: ch... |
657 |
printk(KERN_DEBUG "(NULL device *): %pV", &vaf); |
798efc60e dev_dbg/dynamic_d... |
658 659 |
} else { char buf[PREFIX_SIZE]; |
798efc60e dev_dbg/dynamic_d... |
660 |
|
a39d4a857 printk: add and u... |
661 |
dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV", |
906d20153 dynamic_debug: ch... |
662 663 664 |
dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev), dev_name(dev), &vaf); |
798efc60e dev_dbg/dynamic_d... |
665 |
} |
cbc466355 dynamic_debug: Ad... |
666 |
va_end(args); |
cbc466355 dynamic_debug: Ad... |
667 668 |
} EXPORT_SYMBOL(__dynamic_dev_dbg); |
0feefd978 dynamic_debug: fi... |
669 |
#ifdef CONFIG_NET |
906d20153 dynamic_debug: ch... |
670 671 |
void __dynamic_netdev_dbg(struct _ddebug *descriptor, const struct net_device *dev, const char *fmt, ...) |
ffa10cb47 dynamic_debug: ma... |
672 673 674 |
{ struct va_format vaf; va_list args; |
ffa10cb47 dynamic_debug: ma... |
675 676 677 678 679 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
b004ff497 netdev_printk/dyn... |
680 |
|
ffa10cb47 dynamic_debug: ma... |
681 682 |
vaf.fmt = fmt; vaf.va = &args; |
b004ff497 netdev_printk/dyn... |
683 684 685 |
if (dev && dev->dev.parent) { char buf[PREFIX_SIZE]; |
666f355f3 device and dynami... |
686 |
|
a39d4a857 printk: add and u... |
687 |
dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent, |
906d20153 dynamic_debug: ch... |
688 689 690 691 692 693 |
"%s%s %s %s%s: %pV", dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev->dev.parent), dev_name(dev->dev.parent), netdev_name(dev), netdev_reg_state(dev), &vaf); |
b004ff497 netdev_printk/dyn... |
694 |
} else if (dev) { |
906d20153 dynamic_debug: ch... |
695 696 |
printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev), netdev_reg_state(dev), &vaf); |
b004ff497 netdev_printk/dyn... |
697 |
} else { |
906d20153 dynamic_debug: ch... |
698 |
printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); |
b004ff497 netdev_printk/dyn... |
699 |
} |
ffa10cb47 dynamic_debug: ma... |
700 |
va_end(args); |
ffa10cb47 dynamic_debug: ma... |
701 702 |
} EXPORT_SYMBOL(__dynamic_netdev_dbg); |
0feefd978 dynamic_debug: fi... |
703 |
#endif |
923abb9d7 RDMA/core: Introd... |
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 |
#if IS_ENABLED(CONFIG_INFINIBAND) void __dynamic_ibdev_dbg(struct _ddebug *descriptor, const struct ib_device *ibdev, const char *fmt, ...) { struct va_format vaf; va_list args; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; if (ibdev && ibdev->dev.parent) { char buf[PREFIX_SIZE]; dev_printk_emit(LOGLEVEL_DEBUG, ibdev->dev.parent, "%s%s %s %s: %pV", dynamic_emit_prefix(descriptor, buf), dev_driver_string(ibdev->dev.parent), dev_name(ibdev->dev.parent), dev_name(&ibdev->dev), &vaf); } else if (ibdev) { printk(KERN_DEBUG "%s: %pV", dev_name(&ibdev->dev), &vaf); } else { printk(KERN_DEBUG "(NULL ib_device): %pV", &vaf); } va_end(args); } EXPORT_SYMBOL(__dynamic_ibdev_dbg); #endif |
bc757f6f5 dynamic_debug: re... |
738 739 |
#define DDEBUG_STRING_SIZE 1024 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; |
a648ec05b Dynamic Debug: In... |
740 741 |
static __init int ddebug_setup_query(char *str) { |
bc757f6f5 dynamic_debug: re... |
742 |
if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5c dynamic_debug: Co... |
743 744 |
pr_warn("ddebug boot param string too large "); |
a648ec05b Dynamic Debug: In... |
745 746 |
return 0; } |
bc757f6f5 dynamic_debug: re... |
747 |
strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05b Dynamic Debug: In... |
748 749 750 751 |
return 1; } __setup("ddebug_query=", ddebug_setup_query); |
e9d376f0f dynamic debug: co... |
752 |
/* |
231821d4c dynamic_debug: fi... |
753 |
* File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the |
e9d376f0f dynamic debug: co... |
754 755 |
* command text from userspace, parses and executes it. */ |
7281491c5 dynamic_debug: en... |
756 |
#define USER_BUF_PAGE 4096 |
e9d376f0f dynamic debug: co... |
757 758 759 |
static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, size_t len, loff_t *offp) { |
7281491c5 dynamic_debug: en... |
760 |
char *tmpbuf; |
fd89cfb87 Dynamic Debug: Sp... |
761 |
int ret; |
e9d376f0f dynamic debug: co... |
762 763 764 |
if (len == 0) return 0; |
7281491c5 dynamic_debug: en... |
765 766 767 |
if (len > USER_BUF_PAGE - 1) { pr_warn("expected <%d bytes into control ", USER_BUF_PAGE); |
e9d376f0f dynamic debug: co... |
768 |
return -E2BIG; |
7281491c5 dynamic_debug: en... |
769 |
} |
16e5c1fc3 convert a bunch o... |
770 771 772 |
tmpbuf = memdup_user_nul(ubuf, len); if (IS_ERR(tmpbuf)) return PTR_ERR(tmpbuf); |
b8ccd5dee dynamic_debug: re... |
773 774 |
vpr_info("read %d bytes from userspace ", (int)len); |
e9d376f0f dynamic debug: co... |
775 |
|
8e59b5cfb dynamic_debug: ad... |
776 |
ret = ddebug_exec_queries(tmpbuf, NULL); |
7281491c5 dynamic_debug: en... |
777 |
kfree(tmpbuf); |
85f7f6c0e dynamic_debug: pr... |
778 |
if (ret < 0) |
fd89cfb87 Dynamic Debug: Sp... |
779 |
return ret; |
e9d376f0f dynamic debug: co... |
780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 |
*offp += len; return len; } /* * Set the iterator to point to the first _ddebug object * and return a pointer to that first object. Returns * NULL if there are no _ddebugs at all. */ static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter) { if (list_empty(&ddebug_tables)) { iter->table = NULL; iter->idx = 0; return NULL; } iter->table = list_entry(ddebug_tables.next, struct ddebug_table, link); iter->idx = 0; return &iter->table->ddebugs[iter->idx]; } /* * Advance the iterator to point to the next _ddebug * object from the one the iterator currently points at, * and returns a pointer to the new _ddebug. Returns * NULL if the iterator has seen all the _ddebugs. */ static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter) { if (iter->table == NULL) return NULL; if (++iter->idx == iter->table->num_ddebugs) { /* iterate to next table */ iter->idx = 0; if (list_is_last(&iter->table->link, &ddebug_tables)) { iter->table = NULL; return NULL; } iter->table = list_entry(iter->table->link.next, struct ddebug_table, link); } return &iter->table->ddebugs[iter->idx]; } /* * Seq_ops start method. Called at the start of every * read() call from userspace. Takes the ddebug_lock and * seeks the seq_file's iterator to the given position. */ static void *ddebug_proc_start(struct seq_file *m, loff_t *pos) { struct ddebug_iter *iter = m->private; struct _ddebug *dp; int n = *pos; |
e9d376f0f dynamic debug: co... |
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 |
mutex_lock(&ddebug_lock); if (!n) return SEQ_START_TOKEN; if (n < 0) return NULL; dp = ddebug_iter_first(iter); while (dp != NULL && --n > 0) dp = ddebug_iter_next(iter); return dp; } /* * Seq_ops next method. Called several times within a read() * call from userspace, with ddebug_lock held. Walks to the * next _ddebug object with a special case for the header line. */ static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos) { struct ddebug_iter *iter = m->private; struct _ddebug *dp; |
e9d376f0f dynamic debug: co... |
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 |
if (p == SEQ_START_TOKEN) dp = ddebug_iter_first(iter); else dp = ddebug_iter_next(iter); ++*pos; return dp; } /* * Seq_ops show method. Called several times within a read() * call from userspace, with ddebug_lock held. Formats the * current _ddebug as a single human-readable line, with a * special case for the header line. */ static int ddebug_proc_show(struct seq_file *m, void *p) { struct ddebug_iter *iter = m->private; struct _ddebug *dp = p; |
f678ce8cc dyndbg: fix a BUG... |
875 |
struct flagsbuf flags; |
e9d376f0f dynamic debug: co... |
876 |
|
e9d376f0f dynamic debug: co... |
877 878 |
if (p == SEQ_START_TOKEN) { seq_puts(m, |
f657fd21e dynamic_debug: Fi... |
879 880 |
"# filename:lineno [module]function flags format "); |
e9d376f0f dynamic debug: co... |
881 882 |
return 0; } |
5ca7d2a6c dynamic_debug: de... |
883 |
seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21e dynamic_debug: Fi... |
884 885 |
trim_prefix(dp->filename), dp->lineno, iter->table->mod_name, dp->function, |
f678ce8cc dyndbg: fix a BUG... |
886 |
ddebug_describe_flags(dp->flags, &flags)); |
e9d376f0f dynamic debug: co... |
887 888 889 890 891 892 893 894 895 896 897 898 899 900 |
seq_escape(m, dp->format, "\t\r \""); seq_puts(m, "\" "); return 0; } /* * Seq_ops stop method. Called at the end of each read() * call from userspace. Drops ddebug_lock. */ static void ddebug_proc_stop(struct seq_file *m, void *p) { |
e9d376f0f dynamic debug: co... |
901 902 903 904 905 906 907 908 909 |
mutex_unlock(&ddebug_lock); } static const struct seq_operations ddebug_proc_seqops = { .start = ddebug_proc_start, .next = ddebug_proc_next, .show = ddebug_proc_show, .stop = ddebug_proc_stop }; |
e9d376f0f dynamic debug: co... |
910 911 |
static int ddebug_proc_open(struct inode *inode, struct file *file) { |
b8ccd5dee dynamic_debug: re... |
912 913 |
vpr_info("called "); |
4bad78c55 lib/dynamic_debug... |
914 915 |
return seq_open_private(file, &ddebug_proc_seqops, sizeof(struct ddebug_iter)); |
e9d376f0f dynamic debug: co... |
916 917 918 919 920 921 922 923 924 925 |
} static const struct file_operations ddebug_proc_fops = { .owner = THIS_MODULE, .open = ddebug_proc_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, .write = ddebug_proc_write }; |
239a5791f dynamic_debug: al... |
926 927 928 929 930 931 932 |
static const struct proc_ops proc_fops = { .proc_open = ddebug_proc_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = seq_release_private, .proc_write = ddebug_proc_write }; |
e9d376f0f dynamic debug: co... |
933 934 935 936 937 938 939 940 |
/* * Allocate a new ddebug_table for the given module * and add it to the global list. */ int ddebug_add_module(struct _ddebug *tab, unsigned int n, const char *name) { struct ddebug_table *dt; |
e9d376f0f dynamic debug: co... |
941 942 |
dt = kzalloc(sizeof(*dt), GFP_KERNEL); |
513770f54 dynamic_debug: mo... |
943 944 945 |
if (dt == NULL) { pr_err("error adding module: %s ", name); |
e9d376f0f dynamic debug: co... |
946 |
return -ENOMEM; |
513770f54 dynamic_debug: mo... |
947 |
} |
cdf6d0069 dynamic_debug: do... |
948 949 950 951 952 953 954 |
/* * For built-in modules, name lives in .rodata and is * immortal. For loaded modules, name points at the name[] * member of struct module, which lives at least as long as * this struct ddebug_table. */ dt->mod_name = name; |
e9d376f0f dynamic debug: co... |
955 |
dt->num_ddebugs = n; |
e9d376f0f dynamic debug: co... |
956 957 958 |
dt->ddebugs = tab; mutex_lock(&ddebug_lock); |
47e9f5a82 dyndbg: make ddeb... |
959 |
list_add(&dt->link, &ddebug_tables); |
e9d376f0f dynamic debug: co... |
960 |
mutex_unlock(&ddebug_lock); |
b52a95eac dyndbg: give %3u ... |
961 962 |
v2pr_info("%3u debug prints in module %s ", n, dt->mod_name); |
e9d376f0f dynamic debug: co... |
963 964 |
return 0; } |
e9d376f0f dynamic debug: co... |
965 |
|
6ab676e96 dynamic_debug: co... |
966 967 968 |
/* helper for ddebug_dyndbg_(boot|module)_param_cb */ static int ddebug_dyndbg_param_cb(char *param, char *val, const char *modname, int on_err) |
b48420c1d dynamic_debug: ma... |
969 |
{ |
b48420c1d dynamic_debug: ma... |
970 971 972 973 |
char *sep; sep = strchr(param, '.'); if (sep) { |
6ab676e96 dynamic_debug: co... |
974 |
/* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1d dynamic_debug: ma... |
975 976 977 978 979 |
*sep = '\0'; modname = param; param = sep + 1; } if (strcmp(param, "dyndbg")) |
6ab676e96 dynamic_debug: co... |
980 |
return on_err; /* determined by caller */ |
b48420c1d dynamic_debug: ma... |
981 |
|
8e59b5cfb dynamic_debug: ad... |
982 |
ddebug_exec_queries((val ? val : "+p"), modname); |
b48420c1d dynamic_debug: ma... |
983 984 |
return 0; /* query failure shouldnt stop module load */ } |
6ab676e96 dynamic_debug: co... |
985 986 |
/* handle both dyndbg and $module.dyndbg params at boot */ static int ddebug_dyndbg_boot_param_cb(char *param, char *val, |
ecc861705 module: add extra... |
987 |
const char *unused, void *arg) |
b48420c1d dynamic_debug: ma... |
988 |
{ |
6ab676e96 dynamic_debug: co... |
989 990 991 992 |
vpr_info("%s=\"%s\" ", param, val); return ddebug_dyndbg_param_cb(param, val, NULL, 0); } |
b48420c1d dynamic_debug: ma... |
993 |
|
6ab676e96 dynamic_debug: co... |
994 995 996 997 998 999 1000 1001 1002 1003 |
/* * modprobe foo finds foo.params in boot-args, strips "foo.", and * passes them to load_module(). This callback gets unknown params, * processes dyndbg params, rejects others. */ int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module) { vpr_info("module: %s %s=\"%s\" ", module, param, val); return ddebug_dyndbg_param_cb(param, val, module, -ENOENT); |
b48420c1d dynamic_debug: ma... |
1004 |
} |
e9d376f0f dynamic debug: co... |
1005 1006 1007 |
static void ddebug_table_free(struct ddebug_table *dt) { list_del_init(&dt->link); |
e9d376f0f dynamic debug: co... |
1008 1009 1010 1011 1012 1013 1014 |
kfree(dt); } /* * Called in response to a module being unloaded. Removes * any ddebug_table's which point at the module. */ |
ff49d74ad module: initializ... |
1015 |
int ddebug_remove_module(const char *mod_name) |
e9d376f0f dynamic debug: co... |
1016 1017 1018 |
{ struct ddebug_table *dt, *nextdt; int ret = -ENOENT; |
481c0e33f dyndbg: refine de... |
1019 1020 |
v2pr_info("removing module \"%s\" ", mod_name); |
e9d376f0f dynamic debug: co... |
1021 1022 1023 |
mutex_lock(&ddebug_lock); list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) { |
4573fe154 dynamic_debug: us... |
1024 |
if (dt->mod_name == mod_name) { |
e9d376f0f dynamic debug: co... |
1025 1026 |
ddebug_table_free(dt); ret = 0; |
4573fe154 dynamic_debug: us... |
1027 |
break; |
e9d376f0f dynamic debug: co... |
1028 1029 1030 1031 1032 |
} } mutex_unlock(&ddebug_lock); return ret; } |
e9d376f0f dynamic debug: co... |
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 |
static void ddebug_remove_all_tables(void) { mutex_lock(&ddebug_lock); while (!list_empty(&ddebug_tables)) { struct ddebug_table *dt = list_entry(ddebug_tables.next, struct ddebug_table, link); ddebug_table_free(dt); } mutex_unlock(&ddebug_lock); } |
6a5c083de Dynamic Debug: In... |
1045 |
static __initdata int ddebug_init_success; |
239a5791f dynamic_debug: al... |
1046 |
static int __init dynamic_debug_init_control(void) |
e9d376f0f dynamic debug: co... |
1047 |
{ |
239a5791f dynamic_debug: al... |
1048 1049 |
struct proc_dir_entry *procfs_dir; struct dentry *debugfs_dir; |
6a5c083de Dynamic Debug: In... |
1050 1051 1052 |
if (!ddebug_init_success) return -ENODEV; |
e9d376f0f dynamic debug: co... |
1053 |
|
239a5791f dynamic_debug: al... |
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 |
/* Create the control file in debugfs if it is enabled */ if (debugfs_initialized()) { debugfs_dir = debugfs_create_dir("dynamic_debug", NULL); debugfs_create_file("control", 0644, debugfs_dir, NULL, &ddebug_proc_fops); } /* Also create the control file in procfs */ procfs_dir = proc_mkdir("dynamic_debug", NULL); if (procfs_dir) proc_create("control", 0644, procfs_dir, &proc_fops); |
9fd714cd7 lib: dynamic_debu... |
1065 |
|
6a5c083de Dynamic Debug: In... |
1066 1067 1068 1069 1070 1071 1072 |
return 0; } static int __init dynamic_debug_init(void) { struct _ddebug *iter, *iter_start; const char *modname = NULL; |
b48420c1d dynamic_debug: ma... |
1073 |
char *cmdline; |
6a5c083de Dynamic Debug: In... |
1074 |
int ret = 0; |
410769276 dynamic_debug: pr... |
1075 |
int n = 0, entries = 0, modct = 0; |
6a5c083de Dynamic Debug: In... |
1076 |
|
e5ebffe18 dyndbg: rename __... |
1077 |
if (&__start___dyndbg == &__stop___dyndbg) { |
ceabef7dd dynamic_debug: ad... |
1078 1079 1080 1081 1082 1083 1084 1085 1086 |
if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) { pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build "); return 1; } pr_info("Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build "); ddebug_init_success = 1; return 0; |
b5b78f838 dynamic_debug: ea... |
1087 |
} |
e5ebffe18 dyndbg: rename __... |
1088 |
iter = __start___dyndbg; |
b5b78f838 dynamic_debug: ea... |
1089 1090 |
modname = iter->modname; iter_start = iter; |
e5ebffe18 dyndbg: rename __... |
1091 |
for (; iter < __stop___dyndbg; iter++) { |
410769276 dynamic_debug: pr... |
1092 |
entries++; |
b5b78f838 dynamic_debug: ea... |
1093 |
if (strcmp(modname, iter->modname)) { |
410769276 dynamic_debug: pr... |
1094 |
modct++; |
b5b78f838 dynamic_debug: ea... |
1095 1096 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f dynamic_debug: si... |
1097 |
goto out_err; |
b5b78f838 dynamic_debug: ea... |
1098 1099 1100 |
n = 0; modname = iter->modname; iter_start = iter; |
e9d376f0f dynamic debug: co... |
1101 |
} |
b5b78f838 dynamic_debug: ea... |
1102 |
n++; |
e9d376f0f dynamic debug: co... |
1103 |
} |
b5b78f838 dynamic_debug: ea... |
1104 1105 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f dynamic_debug: si... |
1106 |
goto out_err; |
a648ec05b Dynamic Debug: In... |
1107 |
|
af442399f dynamic_debug: si... |
1108 |
ddebug_init_success = 1; |
81d0c2c60 dyndbg: fix overc... |
1109 1110 |
vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in __dyndbg section ", |
f657fd21e dynamic_debug: Fi... |
1111 |
modct, entries, (int)(modct * sizeof(struct ddebug_table)), |
81d0c2c60 dyndbg: fix overc... |
1112 |
(int)(entries * sizeof(struct _ddebug))); |
af442399f dynamic_debug: si... |
1113 1114 |
/* apply ddebug_query boot param, dont unload tables on err */ |
a648ec05b Dynamic Debug: In... |
1115 |
if (ddebug_setup_string[0] != '\0') { |
f657fd21e dynamic_debug: Fi... |
1116 1117 |
pr_warn("ddebug_query param name is deprecated, change it to dyndbg "); |
8e59b5cfb dynamic_debug: ad... |
1118 |
ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0e dynamic_debug: pr... |
1119 |
if (ret < 0) |
f657fd21e dynamic_debug: Fi... |
1120 1121 |
pr_warn("Invalid ddebug boot param %s ", |
4ad275e5c dynamic_debug: Co... |
1122 |
ddebug_setup_string); |
a648ec05b Dynamic Debug: In... |
1123 |
else |
85f7f6c0e dynamic_debug: pr... |
1124 1125 |
pr_info("%d changes by ddebug_query ", ret); |
a648ec05b Dynamic Debug: In... |
1126 |
} |
b48420c1d dynamic_debug: ma... |
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 |
/* now that ddebug tables are loaded, process all boot args * again to find and activate queries given in dyndbg params. * While this has already been done for known boot params, it * ignored the unknown ones (dyndbg in particular). Reusing * parse_args avoids ad-hoc parsing. This will also attempt * to activate queries for not-yet-loaded modules, which is * slightly noisy if verbose, but harmless. */ cmdline = kstrdup(saved_command_line, GFP_KERNEL); parse_args("dyndbg params", cmdline, NULL, |
ecc861705 module: add extra... |
1137 |
0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb); |
b48420c1d dynamic_debug: ma... |
1138 |
kfree(cmdline); |
af442399f dynamic_debug: si... |
1139 |
return 0; |
a648ec05b Dynamic Debug: In... |
1140 |
|
af442399f dynamic_debug: si... |
1141 1142 |
out_err: ddebug_remove_all_tables(); |
e9d376f0f dynamic debug: co... |
1143 1144 |
return 0; } |
6a5c083de Dynamic Debug: In... |
1145 |
/* Allow early initialization for boot messages via boot param */ |
3ec5652ab dynamic_debug: in... |
1146 |
early_initcall(dynamic_debug_init); |
b48420c1d dynamic_debug: ma... |
1147 |
|
6a5c083de Dynamic Debug: In... |
1148 |
/* Debugfs setup must be done later */ |
239a5791f dynamic_debug: al... |
1149 |
fs_initcall(dynamic_debug_init_control); |