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7ce7e424 TZ |
1 | /* |
2 | * trace_events_filter - generic event filtering | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * Copyright (C) 2009 Tom Zanussi <tzanussi@gmail.com> | |
19 | */ | |
20 | ||
7ce7e424 TZ |
21 | #include <linux/module.h> |
22 | #include <linux/ctype.h> | |
ac1adc55 | 23 | #include <linux/mutex.h> |
6fb2915d | 24 | #include <linux/perf_event.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
7ce7e424 TZ |
26 | |
27 | #include "trace.h" | |
4bda2d51 | 28 | #include "trace_output.h" |
7ce7e424 | 29 | |
49aa2951 SR |
30 | #define DEFAULT_SYS_FILTER_MESSAGE \ |
31 | "### global filter ###\n" \ | |
32 | "# Use this to set filters for multiple events.\n" \ | |
33 | "# Only events with the given fields will be affected.\n" \ | |
34 | "# If no events are modified, an error message will be displayed here" | |
35 | ||
8b372562 | 36 | enum filter_op_ids |
7ce7e424 | 37 | { |
8b372562 TZ |
38 | OP_OR, |
39 | OP_AND, | |
b0f1a59a | 40 | OP_GLOB, |
8b372562 TZ |
41 | OP_NE, |
42 | OP_EQ, | |
43 | OP_LT, | |
44 | OP_LE, | |
45 | OP_GT, | |
46 | OP_GE, | |
47 | OP_NONE, | |
48 | OP_OPEN_PAREN, | |
49 | }; | |
50 | ||
51 | struct filter_op { | |
52 | int id; | |
53 | char *string; | |
54 | int precedence; | |
55 | }; | |
56 | ||
57 | static struct filter_op filter_ops[] = { | |
b0f1a59a LZ |
58 | { OP_OR, "||", 1 }, |
59 | { OP_AND, "&&", 2 }, | |
60 | { OP_GLOB, "~", 4 }, | |
61 | { OP_NE, "!=", 4 }, | |
62 | { OP_EQ, "==", 4 }, | |
63 | { OP_LT, "<", 5 }, | |
64 | { OP_LE, "<=", 5 }, | |
65 | { OP_GT, ">", 5 }, | |
66 | { OP_GE, ">=", 5 }, | |
67 | { OP_NONE, "OP_NONE", 0 }, | |
68 | { OP_OPEN_PAREN, "(", 0 }, | |
8b372562 TZ |
69 | }; |
70 | ||
71 | enum { | |
72 | FILT_ERR_NONE, | |
73 | FILT_ERR_INVALID_OP, | |
74 | FILT_ERR_UNBALANCED_PAREN, | |
75 | FILT_ERR_TOO_MANY_OPERANDS, | |
76 | FILT_ERR_OPERAND_TOO_LONG, | |
77 | FILT_ERR_FIELD_NOT_FOUND, | |
78 | FILT_ERR_ILLEGAL_FIELD_OP, | |
79 | FILT_ERR_ILLEGAL_INTVAL, | |
80 | FILT_ERR_BAD_SUBSYS_FILTER, | |
81 | FILT_ERR_TOO_MANY_PREDS, | |
82 | FILT_ERR_MISSING_FIELD, | |
83 | FILT_ERR_INVALID_FILTER, | |
5500fa51 | 84 | FILT_ERR_IP_FIELD_ONLY, |
8b372562 TZ |
85 | }; |
86 | ||
87 | static char *err_text[] = { | |
88 | "No error", | |
89 | "Invalid operator", | |
90 | "Unbalanced parens", | |
91 | "Too many operands", | |
92 | "Operand too long", | |
93 | "Field not found", | |
94 | "Illegal operation for field type", | |
95 | "Illegal integer value", | |
96 | "Couldn't find or set field in one of a subsystem's events", | |
97 | "Too many terms in predicate expression", | |
98 | "Missing field name and/or value", | |
99 | "Meaningless filter expression", | |
5500fa51 | 100 | "Only 'ip' field is supported for function trace", |
8b372562 TZ |
101 | }; |
102 | ||
103 | struct opstack_op { | |
104 | int op; | |
105 | struct list_head list; | |
106 | }; | |
107 | ||
108 | struct postfix_elt { | |
109 | int op; | |
110 | char *operand; | |
111 | struct list_head list; | |
112 | }; | |
113 | ||
114 | struct filter_parse_state { | |
115 | struct filter_op *ops; | |
116 | struct list_head opstack; | |
117 | struct list_head postfix; | |
118 | int lasterr; | |
119 | int lasterr_pos; | |
120 | ||
121 | struct { | |
122 | char *string; | |
123 | unsigned int cnt; | |
124 | unsigned int tail; | |
125 | } infix; | |
126 | ||
127 | struct { | |
128 | char string[MAX_FILTER_STR_VAL]; | |
129 | int pos; | |
130 | unsigned int tail; | |
131 | } operand; | |
132 | }; | |
133 | ||
61e9dea2 SR |
134 | struct pred_stack { |
135 | struct filter_pred **preds; | |
136 | int index; | |
137 | }; | |
138 | ||
197e2eab | 139 | #define DEFINE_COMPARISON_PRED(type) \ |
58d9a597 | 140 | static int filter_pred_##type(struct filter_pred *pred, void *event) \ |
197e2eab LZ |
141 | { \ |
142 | type *addr = (type *)(event + pred->offset); \ | |
143 | type val = (type)pred->val; \ | |
144 | int match = 0; \ | |
145 | \ | |
146 | switch (pred->op) { \ | |
147 | case OP_LT: \ | |
148 | match = (*addr < val); \ | |
149 | break; \ | |
150 | case OP_LE: \ | |
151 | match = (*addr <= val); \ | |
152 | break; \ | |
153 | case OP_GT: \ | |
154 | match = (*addr > val); \ | |
155 | break; \ | |
156 | case OP_GE: \ | |
157 | match = (*addr >= val); \ | |
158 | break; \ | |
159 | default: \ | |
160 | break; \ | |
161 | } \ | |
162 | \ | |
163 | return match; \ | |
164 | } | |
165 | ||
166 | #define DEFINE_EQUALITY_PRED(size) \ | |
58d9a597 | 167 | static int filter_pred_##size(struct filter_pred *pred, void *event) \ |
197e2eab LZ |
168 | { \ |
169 | u##size *addr = (u##size *)(event + pred->offset); \ | |
170 | u##size val = (u##size)pred->val; \ | |
171 | int match; \ | |
172 | \ | |
173 | match = (val == *addr) ^ pred->not; \ | |
174 | \ | |
175 | return match; \ | |
176 | } | |
177 | ||
8b372562 TZ |
178 | DEFINE_COMPARISON_PRED(s64); |
179 | DEFINE_COMPARISON_PRED(u64); | |
180 | DEFINE_COMPARISON_PRED(s32); | |
181 | DEFINE_COMPARISON_PRED(u32); | |
182 | DEFINE_COMPARISON_PRED(s16); | |
183 | DEFINE_COMPARISON_PRED(u16); | |
184 | DEFINE_COMPARISON_PRED(s8); | |
185 | DEFINE_COMPARISON_PRED(u8); | |
186 | ||
187 | DEFINE_EQUALITY_PRED(64); | |
188 | DEFINE_EQUALITY_PRED(32); | |
189 | DEFINE_EQUALITY_PRED(16); | |
190 | DEFINE_EQUALITY_PRED(8); | |
191 | ||
e8808c10 | 192 | /* Filter predicate for fixed sized arrays of characters */ |
58d9a597 | 193 | static int filter_pred_string(struct filter_pred *pred, void *event) |
7ce7e424 TZ |
194 | { |
195 | char *addr = (char *)(event + pred->offset); | |
196 | int cmp, match; | |
197 | ||
1889d209 | 198 | cmp = pred->regex.match(addr, &pred->regex, pred->regex.field_len); |
7ce7e424 | 199 | |
1889d209 | 200 | match = cmp ^ pred->not; |
7ce7e424 TZ |
201 | |
202 | return match; | |
203 | } | |
204 | ||
87a342f5 | 205 | /* Filter predicate for char * pointers */ |
58d9a597 | 206 | static int filter_pred_pchar(struct filter_pred *pred, void *event) |
87a342f5 LZ |
207 | { |
208 | char **addr = (char **)(event + pred->offset); | |
209 | int cmp, match; | |
16da27a8 | 210 | int len = strlen(*addr) + 1; /* including tailing '\0' */ |
87a342f5 | 211 | |
16da27a8 | 212 | cmp = pred->regex.match(*addr, &pred->regex, len); |
87a342f5 | 213 | |
1889d209 | 214 | match = cmp ^ pred->not; |
87a342f5 LZ |
215 | |
216 | return match; | |
217 | } | |
218 | ||
e8808c10 FW |
219 | /* |
220 | * Filter predicate for dynamic sized arrays of characters. | |
221 | * These are implemented through a list of strings at the end | |
222 | * of the entry. | |
223 | * Also each of these strings have a field in the entry which | |
224 | * contains its offset from the beginning of the entry. | |
225 | * We have then first to get this field, dereference it | |
226 | * and add it to the address of the entry, and at last we have | |
227 | * the address of the string. | |
228 | */ | |
58d9a597 | 229 | static int filter_pred_strloc(struct filter_pred *pred, void *event) |
e8808c10 | 230 | { |
7d536cb3 LZ |
231 | u32 str_item = *(u32 *)(event + pred->offset); |
232 | int str_loc = str_item & 0xffff; | |
233 | int str_len = str_item >> 16; | |
e8808c10 FW |
234 | char *addr = (char *)(event + str_loc); |
235 | int cmp, match; | |
236 | ||
1889d209 | 237 | cmp = pred->regex.match(addr, &pred->regex, str_len); |
e8808c10 | 238 | |
1889d209 | 239 | match = cmp ^ pred->not; |
e8808c10 FW |
240 | |
241 | return match; | |
242 | } | |
243 | ||
58d9a597 | 244 | static int filter_pred_none(struct filter_pred *pred, void *event) |
0a19e53c TZ |
245 | { |
246 | return 0; | |
247 | } | |
248 | ||
d1303dd1 LZ |
249 | /* |
250 | * regex_match_foo - Basic regex callbacks | |
251 | * | |
252 | * @str: the string to be searched | |
253 | * @r: the regex structure containing the pattern string | |
254 | * @len: the length of the string to be searched (including '\0') | |
255 | * | |
256 | * Note: | |
257 | * - @str might not be NULL-terminated if it's of type DYN_STRING | |
258 | * or STATIC_STRING | |
259 | */ | |
260 | ||
1889d209 FW |
261 | static int regex_match_full(char *str, struct regex *r, int len) |
262 | { | |
263 | if (strncmp(str, r->pattern, len) == 0) | |
264 | return 1; | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int regex_match_front(char *str, struct regex *r, int len) | |
269 | { | |
285caad4 | 270 | if (strncmp(str, r->pattern, r->len) == 0) |
1889d209 FW |
271 | return 1; |
272 | return 0; | |
273 | } | |
274 | ||
275 | static int regex_match_middle(char *str, struct regex *r, int len) | |
276 | { | |
b2af211f | 277 | if (strnstr(str, r->pattern, len)) |
1889d209 FW |
278 | return 1; |
279 | return 0; | |
280 | } | |
281 | ||
282 | static int regex_match_end(char *str, struct regex *r, int len) | |
283 | { | |
a3291c14 | 284 | int strlen = len - 1; |
1889d209 | 285 | |
a3291c14 LZ |
286 | if (strlen >= r->len && |
287 | memcmp(str + strlen - r->len, r->pattern, r->len) == 0) | |
1889d209 FW |
288 | return 1; |
289 | return 0; | |
290 | } | |
291 | ||
3f6fe06d FW |
292 | /** |
293 | * filter_parse_regex - parse a basic regex | |
294 | * @buff: the raw regex | |
295 | * @len: length of the regex | |
296 | * @search: will point to the beginning of the string to compare | |
297 | * @not: tell whether the match will have to be inverted | |
298 | * | |
299 | * This passes in a buffer containing a regex and this function will | |
1889d209 FW |
300 | * set search to point to the search part of the buffer and |
301 | * return the type of search it is (see enum above). | |
302 | * This does modify buff. | |
303 | * | |
304 | * Returns enum type. | |
305 | * search returns the pointer to use for comparison. | |
306 | * not returns 1 if buff started with a '!' | |
307 | * 0 otherwise. | |
308 | */ | |
3f6fe06d | 309 | enum regex_type filter_parse_regex(char *buff, int len, char **search, int *not) |
1889d209 FW |
310 | { |
311 | int type = MATCH_FULL; | |
312 | int i; | |
313 | ||
314 | if (buff[0] == '!') { | |
315 | *not = 1; | |
316 | buff++; | |
317 | len--; | |
318 | } else | |
319 | *not = 0; | |
320 | ||
321 | *search = buff; | |
322 | ||
323 | for (i = 0; i < len; i++) { | |
324 | if (buff[i] == '*') { | |
325 | if (!i) { | |
326 | *search = buff + 1; | |
327 | type = MATCH_END_ONLY; | |
328 | } else { | |
329 | if (type == MATCH_END_ONLY) | |
330 | type = MATCH_MIDDLE_ONLY; | |
331 | else | |
332 | type = MATCH_FRONT_ONLY; | |
333 | buff[i] = 0; | |
334 | break; | |
335 | } | |
336 | } | |
337 | } | |
338 | ||
339 | return type; | |
340 | } | |
341 | ||
b0f1a59a | 342 | static void filter_build_regex(struct filter_pred *pred) |
1889d209 FW |
343 | { |
344 | struct regex *r = &pred->regex; | |
b0f1a59a LZ |
345 | char *search; |
346 | enum regex_type type = MATCH_FULL; | |
347 | int not = 0; | |
348 | ||
349 | if (pred->op == OP_GLOB) { | |
350 | type = filter_parse_regex(r->pattern, r->len, &search, ¬); | |
351 | r->len = strlen(search); | |
352 | memmove(r->pattern, search, r->len+1); | |
353 | } | |
1889d209 FW |
354 | |
355 | switch (type) { | |
356 | case MATCH_FULL: | |
357 | r->match = regex_match_full; | |
358 | break; | |
359 | case MATCH_FRONT_ONLY: | |
360 | r->match = regex_match_front; | |
361 | break; | |
362 | case MATCH_MIDDLE_ONLY: | |
363 | r->match = regex_match_middle; | |
364 | break; | |
365 | case MATCH_END_ONLY: | |
366 | r->match = regex_match_end; | |
367 | break; | |
368 | } | |
369 | ||
370 | pred->not ^= not; | |
1889d209 FW |
371 | } |
372 | ||
61e9dea2 SR |
373 | enum move_type { |
374 | MOVE_DOWN, | |
375 | MOVE_UP_FROM_LEFT, | |
376 | MOVE_UP_FROM_RIGHT | |
377 | }; | |
378 | ||
379 | static struct filter_pred * | |
380 | get_pred_parent(struct filter_pred *pred, struct filter_pred *preds, | |
381 | int index, enum move_type *move) | |
382 | { | |
383 | if (pred->parent & FILTER_PRED_IS_RIGHT) | |
384 | *move = MOVE_UP_FROM_RIGHT; | |
385 | else | |
386 | *move = MOVE_UP_FROM_LEFT; | |
387 | pred = &preds[pred->parent & ~FILTER_PRED_IS_RIGHT]; | |
388 | ||
389 | return pred; | |
390 | } | |
391 | ||
f03f5979 JO |
392 | enum walk_return { |
393 | WALK_PRED_ABORT, | |
394 | WALK_PRED_PARENT, | |
395 | WALK_PRED_DEFAULT, | |
396 | }; | |
397 | ||
398 | typedef int (*filter_pred_walkcb_t) (enum move_type move, | |
399 | struct filter_pred *pred, | |
400 | int *err, void *data); | |
401 | ||
402 | static int walk_pred_tree(struct filter_pred *preds, | |
403 | struct filter_pred *root, | |
404 | filter_pred_walkcb_t cb, void *data) | |
405 | { | |
406 | struct filter_pred *pred = root; | |
407 | enum move_type move = MOVE_DOWN; | |
408 | int done = 0; | |
409 | ||
410 | if (!preds) | |
411 | return -EINVAL; | |
412 | ||
413 | do { | |
414 | int err = 0, ret; | |
415 | ||
416 | ret = cb(move, pred, &err, data); | |
417 | if (ret == WALK_PRED_ABORT) | |
418 | return err; | |
419 | if (ret == WALK_PRED_PARENT) | |
420 | goto get_parent; | |
421 | ||
422 | switch (move) { | |
423 | case MOVE_DOWN: | |
424 | if (pred->left != FILTER_PRED_INVALID) { | |
425 | pred = &preds[pred->left]; | |
426 | continue; | |
427 | } | |
428 | goto get_parent; | |
429 | case MOVE_UP_FROM_LEFT: | |
430 | pred = &preds[pred->right]; | |
431 | move = MOVE_DOWN; | |
432 | continue; | |
433 | case MOVE_UP_FROM_RIGHT: | |
434 | get_parent: | |
435 | if (pred == root) | |
436 | break; | |
437 | pred = get_pred_parent(pred, preds, | |
438 | pred->parent, | |
439 | &move); | |
440 | continue; | |
441 | } | |
442 | done = 1; | |
443 | } while (!done); | |
444 | ||
445 | /* We are fine. */ | |
446 | return 0; | |
447 | } | |
448 | ||
43cd4145 SR |
449 | /* |
450 | * A series of AND or ORs where found together. Instead of | |
451 | * climbing up and down the tree branches, an array of the | |
452 | * ops were made in order of checks. We can just move across | |
453 | * the array and short circuit if needed. | |
454 | */ | |
455 | static int process_ops(struct filter_pred *preds, | |
456 | struct filter_pred *op, void *rec) | |
457 | { | |
458 | struct filter_pred *pred; | |
1ef1d1c2 | 459 | int match = 0; |
43cd4145 | 460 | int type; |
43cd4145 SR |
461 | int i; |
462 | ||
463 | /* | |
464 | * Micro-optimization: We set type to true if op | |
465 | * is an OR and false otherwise (AND). Then we | |
466 | * just need to test if the match is equal to | |
467 | * the type, and if it is, we can short circuit the | |
468 | * rest of the checks: | |
469 | * | |
470 | * if ((match && op->op == OP_OR) || | |
471 | * (!match && op->op == OP_AND)) | |
472 | * return match; | |
473 | */ | |
474 | type = op->op == OP_OR; | |
475 | ||
476 | for (i = 0; i < op->val; i++) { | |
477 | pred = &preds[op->ops[i]]; | |
f30120fc JO |
478 | if (!WARN_ON_ONCE(!pred->fn)) |
479 | match = pred->fn(pred, rec); | |
43cd4145 SR |
480 | if (!!match == type) |
481 | return match; | |
482 | } | |
483 | return match; | |
484 | } | |
485 | ||
f30120fc JO |
486 | struct filter_match_preds_data { |
487 | struct filter_pred *preds; | |
488 | int match; | |
489 | void *rec; | |
490 | }; | |
491 | ||
492 | static int filter_match_preds_cb(enum move_type move, struct filter_pred *pred, | |
493 | int *err, void *data) | |
494 | { | |
495 | struct filter_match_preds_data *d = data; | |
496 | ||
497 | *err = 0; | |
498 | switch (move) { | |
499 | case MOVE_DOWN: | |
500 | /* only AND and OR have children */ | |
501 | if (pred->left != FILTER_PRED_INVALID) { | |
502 | /* If ops is set, then it was folded. */ | |
503 | if (!pred->ops) | |
504 | return WALK_PRED_DEFAULT; | |
505 | /* We can treat folded ops as a leaf node */ | |
506 | d->match = process_ops(d->preds, pred, d->rec); | |
507 | } else { | |
508 | if (!WARN_ON_ONCE(!pred->fn)) | |
509 | d->match = pred->fn(pred, d->rec); | |
510 | } | |
511 | ||
512 | return WALK_PRED_PARENT; | |
513 | case MOVE_UP_FROM_LEFT: | |
514 | /* | |
515 | * Check for short circuits. | |
516 | * | |
517 | * Optimization: !!match == (pred->op == OP_OR) | |
518 | * is the same as: | |
519 | * if ((match && pred->op == OP_OR) || | |
520 | * (!match && pred->op == OP_AND)) | |
521 | */ | |
522 | if (!!d->match == (pred->op == OP_OR)) | |
523 | return WALK_PRED_PARENT; | |
524 | break; | |
525 | case MOVE_UP_FROM_RIGHT: | |
526 | break; | |
527 | } | |
528 | ||
529 | return WALK_PRED_DEFAULT; | |
530 | } | |
531 | ||
7ce7e424 | 532 | /* return 1 if event matches, 0 otherwise (discard) */ |
6fb2915d | 533 | int filter_match_preds(struct event_filter *filter, void *rec) |
7ce7e424 | 534 | { |
74e9e58c | 535 | struct filter_pred *preds; |
61e9dea2 | 536 | struct filter_pred *root; |
f30120fc JO |
537 | struct filter_match_preds_data data = { |
538 | /* match is currently meaningless */ | |
539 | .match = -1, | |
540 | .rec = rec, | |
541 | }; | |
542 | int n_preds, ret; | |
7ce7e424 | 543 | |
6d54057d | 544 | /* no filter is considered a match */ |
75b8e982 SR |
545 | if (!filter) |
546 | return 1; | |
547 | ||
548 | n_preds = filter->n_preds; | |
6d54057d SR |
549 | if (!n_preds) |
550 | return 1; | |
551 | ||
c9c53ca0 | 552 | /* |
61e9dea2 | 553 | * n_preds, root and filter->preds are protect with preemption disabled. |
c9c53ca0 | 554 | */ |
61e9dea2 SR |
555 | root = rcu_dereference_sched(filter->root); |
556 | if (!root) | |
557 | return 1; | |
c9c53ca0 | 558 | |
f30120fc JO |
559 | data.preds = preds = rcu_dereference_sched(filter->preds); |
560 | ret = walk_pred_tree(preds, root, filter_match_preds_cb, &data); | |
561 | WARN_ON(ret); | |
562 | return data.match; | |
7ce7e424 | 563 | } |
17c873ec | 564 | EXPORT_SYMBOL_GPL(filter_match_preds); |
7ce7e424 | 565 | |
8b372562 | 566 | static void parse_error(struct filter_parse_state *ps, int err, int pos) |
7ce7e424 | 567 | { |
8b372562 TZ |
568 | ps->lasterr = err; |
569 | ps->lasterr_pos = pos; | |
570 | } | |
7ce7e424 | 571 | |
8b372562 TZ |
572 | static void remove_filter_string(struct event_filter *filter) |
573 | { | |
75b8e982 SR |
574 | if (!filter) |
575 | return; | |
576 | ||
8b372562 TZ |
577 | kfree(filter->filter_string); |
578 | filter->filter_string = NULL; | |
579 | } | |
580 | ||
581 | static int replace_filter_string(struct event_filter *filter, | |
582 | char *filter_string) | |
583 | { | |
584 | kfree(filter->filter_string); | |
585 | filter->filter_string = kstrdup(filter_string, GFP_KERNEL); | |
586 | if (!filter->filter_string) | |
587 | return -ENOMEM; | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
592 | static int append_filter_string(struct event_filter *filter, | |
593 | char *string) | |
594 | { | |
595 | int newlen; | |
596 | char *new_filter_string; | |
597 | ||
598 | BUG_ON(!filter->filter_string); | |
599 | newlen = strlen(filter->filter_string) + strlen(string) + 1; | |
600 | new_filter_string = kmalloc(newlen, GFP_KERNEL); | |
601 | if (!new_filter_string) | |
602 | return -ENOMEM; | |
603 | ||
604 | strcpy(new_filter_string, filter->filter_string); | |
605 | strcat(new_filter_string, string); | |
606 | kfree(filter->filter_string); | |
607 | filter->filter_string = new_filter_string; | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | static void append_filter_err(struct filter_parse_state *ps, | |
613 | struct event_filter *filter) | |
614 | { | |
615 | int pos = ps->lasterr_pos; | |
616 | char *buf, *pbuf; | |
617 | ||
618 | buf = (char *)__get_free_page(GFP_TEMPORARY); | |
619 | if (!buf) | |
4bda2d51 | 620 | return; |
7ce7e424 | 621 | |
8b372562 TZ |
622 | append_filter_string(filter, "\n"); |
623 | memset(buf, ' ', PAGE_SIZE); | |
624 | if (pos > PAGE_SIZE - 128) | |
625 | pos = 0; | |
626 | buf[pos] = '^'; | |
627 | pbuf = &buf[pos] + 1; | |
628 | ||
629 | sprintf(pbuf, "\nparse_error: %s\n", err_text[ps->lasterr]); | |
630 | append_filter_string(filter, buf); | |
631 | free_page((unsigned long) buf); | |
7ce7e424 TZ |
632 | } |
633 | ||
8b372562 | 634 | void print_event_filter(struct ftrace_event_call *call, struct trace_seq *s) |
ac1adc55 | 635 | { |
75b8e982 | 636 | struct event_filter *filter; |
8b372562 | 637 | |
00e95830 | 638 | mutex_lock(&event_mutex); |
75b8e982 | 639 | filter = call->filter; |
8e254c1d | 640 | if (filter && filter->filter_string) |
8b372562 TZ |
641 | trace_seq_printf(s, "%s\n", filter->filter_string); |
642 | else | |
643 | trace_seq_printf(s, "none\n"); | |
00e95830 | 644 | mutex_unlock(&event_mutex); |
ac1adc55 TZ |
645 | } |
646 | ||
8b372562 | 647 | void print_subsystem_event_filter(struct event_subsystem *system, |
ac1adc55 TZ |
648 | struct trace_seq *s) |
649 | { | |
75b8e982 | 650 | struct event_filter *filter; |
8b372562 | 651 | |
00e95830 | 652 | mutex_lock(&event_mutex); |
75b8e982 | 653 | filter = system->filter; |
8e254c1d | 654 | if (filter && filter->filter_string) |
8b372562 TZ |
655 | trace_seq_printf(s, "%s\n", filter->filter_string); |
656 | else | |
49aa2951 | 657 | trace_seq_printf(s, DEFAULT_SYS_FILTER_MESSAGE "\n"); |
00e95830 | 658 | mutex_unlock(&event_mutex); |
ac1adc55 TZ |
659 | } |
660 | ||
7ce7e424 | 661 | static struct ftrace_event_field * |
8728fe50 | 662 | __find_event_field(struct list_head *head, char *name) |
7ce7e424 | 663 | { |
1fc2d5c1 | 664 | struct ftrace_event_field *field; |
7ce7e424 | 665 | |
2e33af02 | 666 | list_for_each_entry(field, head, link) { |
7ce7e424 TZ |
667 | if (!strcmp(field->name, name)) |
668 | return field; | |
669 | } | |
670 | ||
671 | return NULL; | |
672 | } | |
673 | ||
8728fe50 LZ |
674 | static struct ftrace_event_field * |
675 | find_event_field(struct ftrace_event_call *call, char *name) | |
676 | { | |
677 | struct ftrace_event_field *field; | |
678 | struct list_head *head; | |
679 | ||
680 | field = __find_event_field(&ftrace_common_fields, name); | |
681 | if (field) | |
682 | return field; | |
683 | ||
684 | head = trace_get_fields(call); | |
685 | return __find_event_field(head, name); | |
686 | } | |
687 | ||
61e9dea2 SR |
688 | static int __alloc_pred_stack(struct pred_stack *stack, int n_preds) |
689 | { | |
47b0edcb | 690 | stack->preds = kcalloc(n_preds + 1, sizeof(*stack->preds), GFP_KERNEL); |
61e9dea2 SR |
691 | if (!stack->preds) |
692 | return -ENOMEM; | |
693 | stack->index = n_preds; | |
694 | return 0; | |
695 | } | |
696 | ||
697 | static void __free_pred_stack(struct pred_stack *stack) | |
698 | { | |
699 | kfree(stack->preds); | |
700 | stack->index = 0; | |
701 | } | |
702 | ||
703 | static int __push_pred_stack(struct pred_stack *stack, | |
704 | struct filter_pred *pred) | |
705 | { | |
706 | int index = stack->index; | |
707 | ||
708 | if (WARN_ON(index == 0)) | |
709 | return -ENOSPC; | |
710 | ||
711 | stack->preds[--index] = pred; | |
712 | stack->index = index; | |
713 | return 0; | |
714 | } | |
715 | ||
716 | static struct filter_pred * | |
717 | __pop_pred_stack(struct pred_stack *stack) | |
718 | { | |
719 | struct filter_pred *pred; | |
720 | int index = stack->index; | |
721 | ||
722 | pred = stack->preds[index++]; | |
723 | if (!pred) | |
724 | return NULL; | |
725 | ||
726 | stack->index = index; | |
727 | return pred; | |
728 | } | |
729 | ||
730 | static int filter_set_pred(struct event_filter *filter, | |
731 | int idx, | |
732 | struct pred_stack *stack, | |
9d96cd17 | 733 | struct filter_pred *src) |
0a19e53c | 734 | { |
61e9dea2 SR |
735 | struct filter_pred *dest = &filter->preds[idx]; |
736 | struct filter_pred *left; | |
737 | struct filter_pred *right; | |
738 | ||
0a19e53c | 739 | *dest = *src; |
61e9dea2 | 740 | dest->index = idx; |
0a19e53c | 741 | |
61e9dea2 SR |
742 | if (dest->op == OP_OR || dest->op == OP_AND) { |
743 | right = __pop_pred_stack(stack); | |
744 | left = __pop_pred_stack(stack); | |
745 | if (!left || !right) | |
746 | return -EINVAL; | |
43cd4145 SR |
747 | /* |
748 | * If both children can be folded | |
749 | * and they are the same op as this op or a leaf, | |
750 | * then this op can be folded. | |
751 | */ | |
752 | if (left->index & FILTER_PRED_FOLD && | |
753 | (left->op == dest->op || | |
754 | left->left == FILTER_PRED_INVALID) && | |
755 | right->index & FILTER_PRED_FOLD && | |
756 | (right->op == dest->op || | |
757 | right->left == FILTER_PRED_INVALID)) | |
758 | dest->index |= FILTER_PRED_FOLD; | |
759 | ||
760 | dest->left = left->index & ~FILTER_PRED_FOLD; | |
761 | dest->right = right->index & ~FILTER_PRED_FOLD; | |
762 | left->parent = dest->index & ~FILTER_PRED_FOLD; | |
61e9dea2 | 763 | right->parent = dest->index | FILTER_PRED_IS_RIGHT; |
43cd4145 | 764 | } else { |
61e9dea2 SR |
765 | /* |
766 | * Make dest->left invalid to be used as a quick | |
767 | * way to know this is a leaf node. | |
768 | */ | |
769 | dest->left = FILTER_PRED_INVALID; | |
770 | ||
43cd4145 SR |
771 | /* All leafs allow folding the parent ops. */ |
772 | dest->index |= FILTER_PRED_FOLD; | |
773 | } | |
774 | ||
61e9dea2 | 775 | return __push_pred_stack(stack, dest); |
0a19e53c TZ |
776 | } |
777 | ||
c9c53ca0 SR |
778 | static void __free_preds(struct event_filter *filter) |
779 | { | |
c9c53ca0 | 780 | if (filter->preds) { |
c9c53ca0 SR |
781 | kfree(filter->preds); |
782 | filter->preds = NULL; | |
783 | } | |
784 | filter->a_preds = 0; | |
785 | filter->n_preds = 0; | |
786 | } | |
787 | ||
75b8e982 | 788 | static void filter_disable(struct ftrace_event_call *call) |
7ce7e424 | 789 | { |
553552ce | 790 | call->flags &= ~TRACE_EVENT_FL_FILTERED; |
0a19e53c TZ |
791 | } |
792 | ||
c9c53ca0 | 793 | static void __free_filter(struct event_filter *filter) |
2df75e41 | 794 | { |
8e254c1d LZ |
795 | if (!filter) |
796 | return; | |
797 | ||
c9c53ca0 | 798 | __free_preds(filter); |
57be8887 | 799 | kfree(filter->filter_string); |
2df75e41 | 800 | kfree(filter); |
6fb2915d LZ |
801 | } |
802 | ||
75b8e982 SR |
803 | /* |
804 | * Called when destroying the ftrace_event_call. | |
805 | * The call is being freed, so we do not need to worry about | |
806 | * the call being currently used. This is for module code removing | |
807 | * the tracepoints from within it. | |
808 | */ | |
6fb2915d LZ |
809 | void destroy_preds(struct ftrace_event_call *call) |
810 | { | |
c9c53ca0 | 811 | __free_filter(call->filter); |
2df75e41 LZ |
812 | call->filter = NULL; |
813 | } | |
814 | ||
c9c53ca0 | 815 | static struct event_filter *__alloc_filter(void) |
0a19e53c | 816 | { |
30e673b2 | 817 | struct event_filter *filter; |
0a19e53c | 818 | |
6fb2915d | 819 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); |
c9c53ca0 SR |
820 | return filter; |
821 | } | |
822 | ||
823 | static int __alloc_preds(struct event_filter *filter, int n_preds) | |
824 | { | |
825 | struct filter_pred *pred; | |
826 | int i; | |
827 | ||
4defe682 SR |
828 | if (filter->preds) |
829 | __free_preds(filter); | |
830 | ||
47b0edcb | 831 | filter->preds = kcalloc(n_preds, sizeof(*filter->preds), GFP_KERNEL); |
c9c53ca0 | 832 | |
30e673b2 | 833 | if (!filter->preds) |
c9c53ca0 SR |
834 | return -ENOMEM; |
835 | ||
4defe682 SR |
836 | filter->a_preds = n_preds; |
837 | filter->n_preds = 0; | |
30e673b2 | 838 | |
c9c53ca0 | 839 | for (i = 0; i < n_preds; i++) { |
74e9e58c | 840 | pred = &filter->preds[i]; |
0a19e53c | 841 | pred->fn = filter_pred_none; |
0a19e53c TZ |
842 | } |
843 | ||
c9c53ca0 | 844 | return 0; |
6fb2915d LZ |
845 | } |
846 | ||
75b8e982 | 847 | static void filter_free_subsystem_preds(struct event_subsystem *system) |
8e254c1d LZ |
848 | { |
849 | struct ftrace_event_call *call; | |
8e254c1d LZ |
850 | |
851 | list_for_each_entry(call, &ftrace_events, list) { | |
8f082018 | 852 | if (strcmp(call->class->system, system->name) != 0) |
8e254c1d LZ |
853 | continue; |
854 | ||
75b8e982 SR |
855 | filter_disable(call); |
856 | remove_filter_string(call->filter); | |
8e254c1d | 857 | } |
8e254c1d | 858 | } |
7ce7e424 | 859 | |
75b8e982 | 860 | static void filter_free_subsystem_filters(struct event_subsystem *system) |
cfb180f3 | 861 | { |
a59fd602 | 862 | struct ftrace_event_call *call; |
cfb180f3 | 863 | |
a59fd602 | 864 | list_for_each_entry(call, &ftrace_events, list) { |
8f082018 | 865 | if (strcmp(call->class->system, system->name) != 0) |
8e254c1d | 866 | continue; |
75b8e982 SR |
867 | __free_filter(call->filter); |
868 | call->filter = NULL; | |
cfb180f3 TZ |
869 | } |
870 | } | |
871 | ||
9d96cd17 JO |
872 | static int filter_add_pred(struct filter_parse_state *ps, |
873 | struct event_filter *filter, | |
874 | struct filter_pred *pred, | |
875 | struct pred_stack *stack) | |
7ce7e424 | 876 | { |
61aaef55 | 877 | int err; |
7ce7e424 | 878 | |
c9c53ca0 | 879 | if (WARN_ON(filter->n_preds == filter->a_preds)) { |
8b372562 | 880 | parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0); |
0a19e53c | 881 | return -ENOSPC; |
8b372562 | 882 | } |
7ce7e424 | 883 | |
61aaef55 | 884 | err = filter_set_pred(filter, filter->n_preds, stack, pred); |
0a19e53c TZ |
885 | if (err) |
886 | return err; | |
887 | ||
30e673b2 | 888 | filter->n_preds++; |
7ce7e424 | 889 | |
0a19e53c | 890 | return 0; |
7ce7e424 TZ |
891 | } |
892 | ||
aa38e9fc | 893 | int filter_assign_type(const char *type) |
7ce7e424 | 894 | { |
7fcb7c47 LZ |
895 | if (strstr(type, "__data_loc") && strstr(type, "char")) |
896 | return FILTER_DYN_STRING; | |
897 | ||
7ce7e424 | 898 | if (strchr(type, '[') && strstr(type, "char")) |
e8808c10 FW |
899 | return FILTER_STATIC_STRING; |
900 | ||
aa38e9fc LZ |
901 | return FILTER_OTHER; |
902 | } | |
903 | ||
02aa3162 JO |
904 | static bool is_function_field(struct ftrace_event_field *field) |
905 | { | |
906 | return field->filter_type == FILTER_TRACE_FN; | |
907 | } | |
908 | ||
aa38e9fc LZ |
909 | static bool is_string_field(struct ftrace_event_field *field) |
910 | { | |
911 | return field->filter_type == FILTER_DYN_STRING || | |
87a342f5 LZ |
912 | field->filter_type == FILTER_STATIC_STRING || |
913 | field->filter_type == FILTER_PTR_STRING; | |
7ce7e424 TZ |
914 | } |
915 | ||
8b372562 TZ |
916 | static int is_legal_op(struct ftrace_event_field *field, int op) |
917 | { | |
b0f1a59a LZ |
918 | if (is_string_field(field) && |
919 | (op != OP_EQ && op != OP_NE && op != OP_GLOB)) | |
920 | return 0; | |
921 | if (!is_string_field(field) && op == OP_GLOB) | |
8b372562 TZ |
922 | return 0; |
923 | ||
924 | return 1; | |
925 | } | |
926 | ||
927 | static filter_pred_fn_t select_comparison_fn(int op, int field_size, | |
928 | int field_is_signed) | |
929 | { | |
930 | filter_pred_fn_t fn = NULL; | |
931 | ||
932 | switch (field_size) { | |
933 | case 8: | |
934 | if (op == OP_EQ || op == OP_NE) | |
935 | fn = filter_pred_64; | |
936 | else if (field_is_signed) | |
937 | fn = filter_pred_s64; | |
938 | else | |
939 | fn = filter_pred_u64; | |
940 | break; | |
941 | case 4: | |
942 | if (op == OP_EQ || op == OP_NE) | |
943 | fn = filter_pred_32; | |
944 | else if (field_is_signed) | |
945 | fn = filter_pred_s32; | |
946 | else | |
947 | fn = filter_pred_u32; | |
948 | break; | |
949 | case 2: | |
950 | if (op == OP_EQ || op == OP_NE) | |
951 | fn = filter_pred_16; | |
952 | else if (field_is_signed) | |
953 | fn = filter_pred_s16; | |
954 | else | |
955 | fn = filter_pred_u16; | |
956 | break; | |
957 | case 1: | |
958 | if (op == OP_EQ || op == OP_NE) | |
959 | fn = filter_pred_8; | |
960 | else if (field_is_signed) | |
961 | fn = filter_pred_s8; | |
962 | else | |
963 | fn = filter_pred_u8; | |
964 | break; | |
965 | } | |
966 | ||
967 | return fn; | |
968 | } | |
969 | ||
9d96cd17 | 970 | static int init_pred(struct filter_parse_state *ps, |
61aaef55 | 971 | struct ftrace_event_field *field, |
9d96cd17 JO |
972 | struct filter_pred *pred) |
973 | ||
7ce7e424 | 974 | { |
9d96cd17 | 975 | filter_pred_fn_t fn = filter_pred_none; |
f66578a7 | 976 | unsigned long long val; |
5e4904cb | 977 | int ret; |
7ce7e424 | 978 | |
7ce7e424 TZ |
979 | pred->offset = field->offset; |
980 | ||
8b372562 TZ |
981 | if (!is_legal_op(field, pred->op)) { |
982 | parse_error(ps, FILT_ERR_ILLEGAL_FIELD_OP, 0); | |
983 | return -EINVAL; | |
984 | } | |
985 | ||
aa38e9fc | 986 | if (is_string_field(field)) { |
b0f1a59a | 987 | filter_build_regex(pred); |
87a342f5 | 988 | |
1889d209 | 989 | if (field->filter_type == FILTER_STATIC_STRING) { |
e8808c10 | 990 | fn = filter_pred_string; |
1889d209 FW |
991 | pred->regex.field_len = field->size; |
992 | } else if (field->filter_type == FILTER_DYN_STRING) | |
b0f1a59a | 993 | fn = filter_pred_strloc; |
16da27a8 | 994 | else |
87a342f5 | 995 | fn = filter_pred_pchar; |
5500fa51 JO |
996 | } else if (is_function_field(field)) { |
997 | if (strcmp(field->name, "ip")) { | |
998 | parse_error(ps, FILT_ERR_IP_FIELD_ONLY, 0); | |
999 | return -EINVAL; | |
1000 | } | |
1001 | } else { | |
5e4904cb | 1002 | if (field->is_signed) |
1889d209 | 1003 | ret = strict_strtoll(pred->regex.pattern, 0, &val); |
5e4904cb | 1004 | else |
1889d209 | 1005 | ret = strict_strtoull(pred->regex.pattern, 0, &val); |
5e4904cb | 1006 | if (ret) { |
8b372562 | 1007 | parse_error(ps, FILT_ERR_ILLEGAL_INTVAL, 0); |
9f58a159 | 1008 | return -EINVAL; |
8b372562 | 1009 | } |
f66578a7 | 1010 | pred->val = val; |
7ce7e424 | 1011 | |
1f9963cb LZ |
1012 | fn = select_comparison_fn(pred->op, field->size, |
1013 | field->is_signed); | |
1014 | if (!fn) { | |
1015 | parse_error(ps, FILT_ERR_INVALID_OP, 0); | |
1016 | return -EINVAL; | |
1017 | } | |
7ce7e424 TZ |
1018 | } |
1019 | ||
8b372562 TZ |
1020 | if (pred->op == OP_NE) |
1021 | pred->not = 1; | |
ac1adc55 | 1022 | |
9d96cd17 | 1023 | pred->fn = fn; |
1f9963cb | 1024 | return 0; |
cfb180f3 TZ |
1025 | } |
1026 | ||
8b372562 TZ |
1027 | static void parse_init(struct filter_parse_state *ps, |
1028 | struct filter_op *ops, | |
1029 | char *infix_string) | |
1030 | { | |
1031 | memset(ps, '\0', sizeof(*ps)); | |
1032 | ||
1033 | ps->infix.string = infix_string; | |
1034 | ps->infix.cnt = strlen(infix_string); | |
1035 | ps->ops = ops; | |
1036 | ||
1037 | INIT_LIST_HEAD(&ps->opstack); | |
1038 | INIT_LIST_HEAD(&ps->postfix); | |
1039 | } | |
1040 | ||
1041 | static char infix_next(struct filter_parse_state *ps) | |
1042 | { | |
1043 | ps->infix.cnt--; | |
1044 | ||
1045 | return ps->infix.string[ps->infix.tail++]; | |
1046 | } | |
1047 | ||
1048 | static char infix_peek(struct filter_parse_state *ps) | |
1049 | { | |
1050 | if (ps->infix.tail == strlen(ps->infix.string)) | |
1051 | return 0; | |
1052 | ||
1053 | return ps->infix.string[ps->infix.tail]; | |
1054 | } | |
1055 | ||
1056 | static void infix_advance(struct filter_parse_state *ps) | |
1057 | { | |
1058 | ps->infix.cnt--; | |
1059 | ps->infix.tail++; | |
1060 | } | |
1061 | ||
1062 | static inline int is_precedence_lower(struct filter_parse_state *ps, | |
1063 | int a, int b) | |
1064 | { | |
1065 | return ps->ops[a].precedence < ps->ops[b].precedence; | |
1066 | } | |
1067 | ||
1068 | static inline int is_op_char(struct filter_parse_state *ps, char c) | |
1069 | { | |
1070 | int i; | |
1071 | ||
1072 | for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) { | |
1073 | if (ps->ops[i].string[0] == c) | |
1074 | return 1; | |
1075 | } | |
c4cff064 | 1076 | |
0a19e53c | 1077 | return 0; |
cfb180f3 TZ |
1078 | } |
1079 | ||
8b372562 TZ |
1080 | static int infix_get_op(struct filter_parse_state *ps, char firstc) |
1081 | { | |
1082 | char nextc = infix_peek(ps); | |
1083 | char opstr[3]; | |
1084 | int i; | |
1085 | ||
1086 | opstr[0] = firstc; | |
1087 | opstr[1] = nextc; | |
1088 | opstr[2] = '\0'; | |
1089 | ||
1090 | for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) { | |
1091 | if (!strcmp(opstr, ps->ops[i].string)) { | |
1092 | infix_advance(ps); | |
1093 | return ps->ops[i].id; | |
7ce7e424 | 1094 | } |
8b372562 TZ |
1095 | } |
1096 | ||
1097 | opstr[1] = '\0'; | |
1098 | ||
1099 | for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) { | |
1100 | if (!strcmp(opstr, ps->ops[i].string)) | |
1101 | return ps->ops[i].id; | |
1102 | } | |
1103 | ||
1104 | return OP_NONE; | |
1105 | } | |
1106 | ||
1107 | static inline void clear_operand_string(struct filter_parse_state *ps) | |
1108 | { | |
1109 | memset(ps->operand.string, '\0', MAX_FILTER_STR_VAL); | |
1110 | ps->operand.tail = 0; | |
1111 | } | |
1112 | ||
1113 | static inline int append_operand_char(struct filter_parse_state *ps, char c) | |
1114 | { | |
5872144f | 1115 | if (ps->operand.tail == MAX_FILTER_STR_VAL - 1) |
8b372562 TZ |
1116 | return -EINVAL; |
1117 | ||
1118 | ps->operand.string[ps->operand.tail++] = c; | |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | ||
1123 | static int filter_opstack_push(struct filter_parse_state *ps, int op) | |
1124 | { | |
1125 | struct opstack_op *opstack_op; | |
1126 | ||
1127 | opstack_op = kmalloc(sizeof(*opstack_op), GFP_KERNEL); | |
1128 | if (!opstack_op) | |
1129 | return -ENOMEM; | |
1130 | ||
1131 | opstack_op->op = op; | |
1132 | list_add(&opstack_op->list, &ps->opstack); | |
1133 | ||
1134 | return 0; | |
1135 | } | |
1136 | ||
1137 | static int filter_opstack_empty(struct filter_parse_state *ps) | |
1138 | { | |
1139 | return list_empty(&ps->opstack); | |
1140 | } | |
1141 | ||
1142 | static int filter_opstack_top(struct filter_parse_state *ps) | |
1143 | { | |
1144 | struct opstack_op *opstack_op; | |
1145 | ||
1146 | if (filter_opstack_empty(ps)) | |
1147 | return OP_NONE; | |
1148 | ||
1149 | opstack_op = list_first_entry(&ps->opstack, struct opstack_op, list); | |
1150 | ||
1151 | return opstack_op->op; | |
1152 | } | |
1153 | ||
1154 | static int filter_opstack_pop(struct filter_parse_state *ps) | |
1155 | { | |
1156 | struct opstack_op *opstack_op; | |
1157 | int op; | |
1158 | ||
1159 | if (filter_opstack_empty(ps)) | |
1160 | return OP_NONE; | |
1161 | ||
1162 | opstack_op = list_first_entry(&ps->opstack, struct opstack_op, list); | |
1163 | op = opstack_op->op; | |
1164 | list_del(&opstack_op->list); | |
1165 | ||
1166 | kfree(opstack_op); | |
1167 | ||
1168 | return op; | |
1169 | } | |
1170 | ||
1171 | static void filter_opstack_clear(struct filter_parse_state *ps) | |
1172 | { | |
1173 | while (!filter_opstack_empty(ps)) | |
1174 | filter_opstack_pop(ps); | |
1175 | } | |
1176 | ||
1177 | static char *curr_operand(struct filter_parse_state *ps) | |
1178 | { | |
1179 | return ps->operand.string; | |
1180 | } | |
1181 | ||
1182 | static int postfix_append_operand(struct filter_parse_state *ps, char *operand) | |
1183 | { | |
1184 | struct postfix_elt *elt; | |
1185 | ||
1186 | elt = kmalloc(sizeof(*elt), GFP_KERNEL); | |
1187 | if (!elt) | |
1188 | return -ENOMEM; | |
1189 | ||
1190 | elt->op = OP_NONE; | |
1191 | elt->operand = kstrdup(operand, GFP_KERNEL); | |
1192 | if (!elt->operand) { | |
1193 | kfree(elt); | |
1194 | return -ENOMEM; | |
1195 | } | |
1196 | ||
1197 | list_add_tail(&elt->list, &ps->postfix); | |
1198 | ||
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | static int postfix_append_op(struct filter_parse_state *ps, int op) | |
1203 | { | |
1204 | struct postfix_elt *elt; | |
1205 | ||
1206 | elt = kmalloc(sizeof(*elt), GFP_KERNEL); | |
1207 | if (!elt) | |
1208 | return -ENOMEM; | |
1209 | ||
1210 | elt->op = op; | |
1211 | elt->operand = NULL; | |
1212 | ||
1213 | list_add_tail(&elt->list, &ps->postfix); | |
1214 | ||
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | static void postfix_clear(struct filter_parse_state *ps) | |
1219 | { | |
1220 | struct postfix_elt *elt; | |
1221 | ||
1222 | while (!list_empty(&ps->postfix)) { | |
1223 | elt = list_first_entry(&ps->postfix, struct postfix_elt, list); | |
8b372562 | 1224 | list_del(&elt->list); |
8ad80731 LZ |
1225 | kfree(elt->operand); |
1226 | kfree(elt); | |
8b372562 TZ |
1227 | } |
1228 | } | |
1229 | ||
1230 | static int filter_parse(struct filter_parse_state *ps) | |
1231 | { | |
5928c3cc | 1232 | int in_string = 0; |
8b372562 TZ |
1233 | int op, top_op; |
1234 | char ch; | |
1235 | ||
1236 | while ((ch = infix_next(ps))) { | |
5928c3cc FW |
1237 | if (ch == '"') { |
1238 | in_string ^= 1; | |
1239 | continue; | |
1240 | } | |
1241 | ||
1242 | if (in_string) | |
1243 | goto parse_operand; | |
1244 | ||
8b372562 TZ |
1245 | if (isspace(ch)) |
1246 | continue; | |
1247 | ||
1248 | if (is_op_char(ps, ch)) { | |
1249 | op = infix_get_op(ps, ch); | |
1250 | if (op == OP_NONE) { | |
1251 | parse_error(ps, FILT_ERR_INVALID_OP, 0); | |
7ce7e424 TZ |
1252 | return -EINVAL; |
1253 | } | |
8b372562 TZ |
1254 | |
1255 | if (strlen(curr_operand(ps))) { | |
1256 | postfix_append_operand(ps, curr_operand(ps)); | |
1257 | clear_operand_string(ps); | |
1258 | } | |
1259 | ||
1260 | while (!filter_opstack_empty(ps)) { | |
1261 | top_op = filter_opstack_top(ps); | |
1262 | if (!is_precedence_lower(ps, top_op, op)) { | |
1263 | top_op = filter_opstack_pop(ps); | |
1264 | postfix_append_op(ps, top_op); | |
1265 | continue; | |
1266 | } | |
1267 | break; | |
1268 | } | |
1269 | ||
1270 | filter_opstack_push(ps, op); | |
7ce7e424 TZ |
1271 | continue; |
1272 | } | |
8b372562 TZ |
1273 | |
1274 | if (ch == '(') { | |
1275 | filter_opstack_push(ps, OP_OPEN_PAREN); | |
1276 | continue; | |
1277 | } | |
1278 | ||
1279 | if (ch == ')') { | |
1280 | if (strlen(curr_operand(ps))) { | |
1281 | postfix_append_operand(ps, curr_operand(ps)); | |
1282 | clear_operand_string(ps); | |
1283 | } | |
1284 | ||
1285 | top_op = filter_opstack_pop(ps); | |
1286 | while (top_op != OP_NONE) { | |
1287 | if (top_op == OP_OPEN_PAREN) | |
1288 | break; | |
1289 | postfix_append_op(ps, top_op); | |
1290 | top_op = filter_opstack_pop(ps); | |
1291 | } | |
1292 | if (top_op == OP_NONE) { | |
1293 | parse_error(ps, FILT_ERR_UNBALANCED_PAREN, 0); | |
1294 | return -EINVAL; | |
7ce7e424 | 1295 | } |
7ce7e424 TZ |
1296 | continue; |
1297 | } | |
5928c3cc | 1298 | parse_operand: |
8b372562 TZ |
1299 | if (append_operand_char(ps, ch)) { |
1300 | parse_error(ps, FILT_ERR_OPERAND_TOO_LONG, 0); | |
1301 | return -EINVAL; | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | if (strlen(curr_operand(ps))) | |
1306 | postfix_append_operand(ps, curr_operand(ps)); | |
1307 | ||
1308 | while (!filter_opstack_empty(ps)) { | |
1309 | top_op = filter_opstack_pop(ps); | |
1310 | if (top_op == OP_NONE) | |
1311 | break; | |
1312 | if (top_op == OP_OPEN_PAREN) { | |
1313 | parse_error(ps, FILT_ERR_UNBALANCED_PAREN, 0); | |
1314 | return -EINVAL; | |
1315 | } | |
1316 | postfix_append_op(ps, top_op); | |
1317 | } | |
1318 | ||
1319 | return 0; | |
1320 | } | |
1321 | ||
81570d9c | 1322 | static struct filter_pred *create_pred(struct filter_parse_state *ps, |
9d96cd17 | 1323 | struct ftrace_event_call *call, |
81570d9c | 1324 | int op, char *operand1, char *operand2) |
8b372562 | 1325 | { |
61aaef55 | 1326 | struct ftrace_event_field *field; |
81570d9c | 1327 | static struct filter_pred pred; |
8b372562 | 1328 | |
81570d9c JO |
1329 | memset(&pred, 0, sizeof(pred)); |
1330 | pred.op = op; | |
8b372562 | 1331 | |
81570d9c JO |
1332 | if (op == OP_AND || op == OP_OR) |
1333 | return &pred; | |
1334 | ||
1335 | if (!operand1 || !operand2) { | |
1336 | parse_error(ps, FILT_ERR_MISSING_FIELD, 0); | |
8b372562 TZ |
1337 | return NULL; |
1338 | } | |
1339 | ||
61aaef55 JO |
1340 | field = find_event_field(call, operand1); |
1341 | if (!field) { | |
1342 | parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0); | |
8b372562 | 1343 | return NULL; |
61aaef55 | 1344 | } |
8b372562 | 1345 | |
81570d9c JO |
1346 | strcpy(pred.regex.pattern, operand2); |
1347 | pred.regex.len = strlen(pred.regex.pattern); | |
1d0e78e3 | 1348 | pred.field = field; |
61aaef55 | 1349 | return init_pred(ps, field, &pred) ? NULL : &pred; |
8b372562 TZ |
1350 | } |
1351 | ||
1352 | static int check_preds(struct filter_parse_state *ps) | |
1353 | { | |
1354 | int n_normal_preds = 0, n_logical_preds = 0; | |
1355 | struct postfix_elt *elt; | |
1356 | ||
1357 | list_for_each_entry(elt, &ps->postfix, list) { | |
1358 | if (elt->op == OP_NONE) | |
1359 | continue; | |
1360 | ||
1361 | if (elt->op == OP_AND || elt->op == OP_OR) { | |
1362 | n_logical_preds++; | |
1363 | continue; | |
7ce7e424 | 1364 | } |
8b372562 | 1365 | n_normal_preds++; |
7ce7e424 TZ |
1366 | } |
1367 | ||
8b372562 TZ |
1368 | if (!n_normal_preds || n_logical_preds >= n_normal_preds) { |
1369 | parse_error(ps, FILT_ERR_INVALID_FILTER, 0); | |
bcabd91c LZ |
1370 | return -EINVAL; |
1371 | } | |
1372 | ||
8b372562 TZ |
1373 | return 0; |
1374 | } | |
f66578a7 | 1375 | |
c9c53ca0 SR |
1376 | static int count_preds(struct filter_parse_state *ps) |
1377 | { | |
1378 | struct postfix_elt *elt; | |
1379 | int n_preds = 0; | |
1380 | ||
1381 | list_for_each_entry(elt, &ps->postfix, list) { | |
1382 | if (elt->op == OP_NONE) | |
1383 | continue; | |
1384 | n_preds++; | |
1385 | } | |
1386 | ||
1387 | return n_preds; | |
1388 | } | |
1389 | ||
f03f5979 JO |
1390 | struct check_pred_data { |
1391 | int count; | |
1392 | int max; | |
1393 | }; | |
1394 | ||
1395 | static int check_pred_tree_cb(enum move_type move, struct filter_pred *pred, | |
1396 | int *err, void *data) | |
1397 | { | |
1398 | struct check_pred_data *d = data; | |
1399 | ||
1400 | if (WARN_ON(d->count++ > d->max)) { | |
1401 | *err = -EINVAL; | |
1402 | return WALK_PRED_ABORT; | |
1403 | } | |
1404 | return WALK_PRED_DEFAULT; | |
1405 | } | |
1406 | ||
ec126cac SR |
1407 | /* |
1408 | * The tree is walked at filtering of an event. If the tree is not correctly | |
1409 | * built, it may cause an infinite loop. Check here that the tree does | |
1410 | * indeed terminate. | |
1411 | */ | |
1412 | static int check_pred_tree(struct event_filter *filter, | |
1413 | struct filter_pred *root) | |
1414 | { | |
f03f5979 JO |
1415 | struct check_pred_data data = { |
1416 | /* | |
1417 | * The max that we can hit a node is three times. | |
1418 | * Once going down, once coming up from left, and | |
1419 | * once coming up from right. This is more than enough | |
1420 | * since leafs are only hit a single time. | |
1421 | */ | |
1422 | .max = 3 * filter->n_preds, | |
1423 | .count = 0, | |
1424 | }; | |
ec126cac | 1425 | |
f03f5979 JO |
1426 | return walk_pred_tree(filter->preds, root, |
1427 | check_pred_tree_cb, &data); | |
ec126cac SR |
1428 | } |
1429 | ||
c00b060f JO |
1430 | static int count_leafs_cb(enum move_type move, struct filter_pred *pred, |
1431 | int *err, void *data) | |
43cd4145 | 1432 | { |
c00b060f | 1433 | int *count = data; |
43cd4145 | 1434 | |
c00b060f JO |
1435 | if ((move == MOVE_DOWN) && |
1436 | (pred->left == FILTER_PRED_INVALID)) | |
1437 | (*count)++; | |
43cd4145 | 1438 | |
c00b060f JO |
1439 | return WALK_PRED_DEFAULT; |
1440 | } | |
1441 | ||
1442 | static int count_leafs(struct filter_pred *preds, struct filter_pred *root) | |
1443 | { | |
1444 | int count = 0, ret; | |
43cd4145 | 1445 | |
c00b060f JO |
1446 | ret = walk_pred_tree(preds, root, count_leafs_cb, &count); |
1447 | WARN_ON(ret); | |
43cd4145 SR |
1448 | return count; |
1449 | } | |
1450 | ||
96bc293a JO |
1451 | struct fold_pred_data { |
1452 | struct filter_pred *root; | |
1453 | int count; | |
1454 | int children; | |
1455 | }; | |
1456 | ||
1457 | static int fold_pred_cb(enum move_type move, struct filter_pred *pred, | |
1458 | int *err, void *data) | |
1459 | { | |
1460 | struct fold_pred_data *d = data; | |
1461 | struct filter_pred *root = d->root; | |
1462 | ||
1463 | if (move != MOVE_DOWN) | |
1464 | return WALK_PRED_DEFAULT; | |
1465 | if (pred->left != FILTER_PRED_INVALID) | |
1466 | return WALK_PRED_DEFAULT; | |
1467 | ||
1468 | if (WARN_ON(d->count == d->children)) { | |
1469 | *err = -EINVAL; | |
1470 | return WALK_PRED_ABORT; | |
1471 | } | |
1472 | ||
1473 | pred->index &= ~FILTER_PRED_FOLD; | |
1474 | root->ops[d->count++] = pred->index; | |
1475 | return WALK_PRED_DEFAULT; | |
1476 | } | |
1477 | ||
43cd4145 SR |
1478 | static int fold_pred(struct filter_pred *preds, struct filter_pred *root) |
1479 | { | |
96bc293a JO |
1480 | struct fold_pred_data data = { |
1481 | .root = root, | |
1482 | .count = 0, | |
1483 | }; | |
43cd4145 | 1484 | int children; |
43cd4145 SR |
1485 | |
1486 | /* No need to keep the fold flag */ | |
1487 | root->index &= ~FILTER_PRED_FOLD; | |
1488 | ||
1489 | /* If the root is a leaf then do nothing */ | |
1490 | if (root->left == FILTER_PRED_INVALID) | |
1491 | return 0; | |
1492 | ||
1493 | /* count the children */ | |
1494 | children = count_leafs(preds, &preds[root->left]); | |
1495 | children += count_leafs(preds, &preds[root->right]); | |
1496 | ||
47b0edcb | 1497 | root->ops = kcalloc(children, sizeof(*root->ops), GFP_KERNEL); |
43cd4145 SR |
1498 | if (!root->ops) |
1499 | return -ENOMEM; | |
1500 | ||
1501 | root->val = children; | |
96bc293a JO |
1502 | data.children = children; |
1503 | return walk_pred_tree(preds, root, fold_pred_cb, &data); | |
43cd4145 SR |
1504 | } |
1505 | ||
1b797fe5 JO |
1506 | static int fold_pred_tree_cb(enum move_type move, struct filter_pred *pred, |
1507 | int *err, void *data) | |
1508 | { | |
1509 | struct filter_pred *preds = data; | |
1510 | ||
1511 | if (move != MOVE_DOWN) | |
1512 | return WALK_PRED_DEFAULT; | |
1513 | if (!(pred->index & FILTER_PRED_FOLD)) | |
1514 | return WALK_PRED_DEFAULT; | |
1515 | ||
1516 | *err = fold_pred(preds, pred); | |
1517 | if (*err) | |
1518 | return WALK_PRED_ABORT; | |
1519 | ||
1520 | /* eveyrhing below is folded, continue with parent */ | |
1521 | return WALK_PRED_PARENT; | |
1522 | } | |
1523 | ||
43cd4145 SR |
1524 | /* |
1525 | * To optimize the processing of the ops, if we have several "ors" or | |
1526 | * "ands" together, we can put them in an array and process them all | |
1527 | * together speeding up the filter logic. | |
1528 | */ | |
1529 | static int fold_pred_tree(struct event_filter *filter, | |
1530 | struct filter_pred *root) | |
1531 | { | |
1b797fe5 JO |
1532 | return walk_pred_tree(filter->preds, root, fold_pred_tree_cb, |
1533 | filter->preds); | |
43cd4145 SR |
1534 | } |
1535 | ||
fce29d15 | 1536 | static int replace_preds(struct ftrace_event_call *call, |
6fb2915d | 1537 | struct event_filter *filter, |
8b372562 | 1538 | struct filter_parse_state *ps, |
1f9963cb LZ |
1539 | char *filter_string, |
1540 | bool dry_run) | |
8b372562 TZ |
1541 | { |
1542 | char *operand1 = NULL, *operand2 = NULL; | |
1543 | struct filter_pred *pred; | |
ec126cac | 1544 | struct filter_pred *root; |
8b372562 | 1545 | struct postfix_elt *elt; |
61e9dea2 | 1546 | struct pred_stack stack = { }; /* init to NULL */ |
8b372562 | 1547 | int err; |
1f9963cb | 1548 | int n_preds = 0; |
8b372562 | 1549 | |
c9c53ca0 SR |
1550 | n_preds = count_preds(ps); |
1551 | if (n_preds >= MAX_FILTER_PRED) { | |
1552 | parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0); | |
1553 | return -ENOSPC; | |
1554 | } | |
1555 | ||
8b372562 TZ |
1556 | err = check_preds(ps); |
1557 | if (err) | |
1558 | return err; | |
1559 | ||
c9c53ca0 | 1560 | if (!dry_run) { |
61e9dea2 | 1561 | err = __alloc_pred_stack(&stack, n_preds); |
c9c53ca0 SR |
1562 | if (err) |
1563 | return err; | |
61e9dea2 SR |
1564 | err = __alloc_preds(filter, n_preds); |
1565 | if (err) | |
1566 | goto fail; | |
c9c53ca0 SR |
1567 | } |
1568 | ||
1569 | n_preds = 0; | |
8b372562 TZ |
1570 | list_for_each_entry(elt, &ps->postfix, list) { |
1571 | if (elt->op == OP_NONE) { | |
1572 | if (!operand1) | |
1573 | operand1 = elt->operand; | |
1574 | else if (!operand2) | |
1575 | operand2 = elt->operand; | |
1576 | else { | |
1577 | parse_error(ps, FILT_ERR_TOO_MANY_OPERANDS, 0); | |
61e9dea2 SR |
1578 | err = -EINVAL; |
1579 | goto fail; | |
8b372562 TZ |
1580 | } |
1581 | continue; | |
1582 | } | |
1583 | ||
c9c53ca0 | 1584 | if (WARN_ON(n_preds++ == MAX_FILTER_PRED)) { |
1f9963cb | 1585 | parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0); |
61e9dea2 SR |
1586 | err = -ENOSPC; |
1587 | goto fail; | |
1f9963cb LZ |
1588 | } |
1589 | ||
9d96cd17 | 1590 | pred = create_pred(ps, call, elt->op, operand1, operand2); |
61e9dea2 | 1591 | if (!pred) { |
61aaef55 | 1592 | err = -EINVAL; |
61e9dea2 SR |
1593 | goto fail; |
1594 | } | |
61aaef55 | 1595 | |
9d96cd17 JO |
1596 | if (!dry_run) { |
1597 | err = filter_add_pred(ps, filter, pred, &stack); | |
61aaef55 | 1598 | if (err) |
9d96cd17 | 1599 | goto fail; |
9d96cd17 | 1600 | } |
8b372562 TZ |
1601 | |
1602 | operand1 = operand2 = NULL; | |
1603 | } | |
7ce7e424 | 1604 | |
61e9dea2 SR |
1605 | if (!dry_run) { |
1606 | /* We should have one item left on the stack */ | |
1607 | pred = __pop_pred_stack(&stack); | |
1608 | if (!pred) | |
1609 | return -EINVAL; | |
1610 | /* This item is where we start from in matching */ | |
ec126cac | 1611 | root = pred; |
61e9dea2 SR |
1612 | /* Make sure the stack is empty */ |
1613 | pred = __pop_pred_stack(&stack); | |
1614 | if (WARN_ON(pred)) { | |
1615 | err = -EINVAL; | |
1616 | filter->root = NULL; | |
1617 | goto fail; | |
1618 | } | |
ec126cac SR |
1619 | err = check_pred_tree(filter, root); |
1620 | if (err) | |
1621 | goto fail; | |
1622 | ||
43cd4145 SR |
1623 | /* Optimize the tree */ |
1624 | err = fold_pred_tree(filter, root); | |
1625 | if (err) | |
1626 | goto fail; | |
1627 | ||
ec126cac SR |
1628 | /* We don't set root until we know it works */ |
1629 | barrier(); | |
1630 | filter->root = root; | |
61e9dea2 SR |
1631 | } |
1632 | ||
1633 | err = 0; | |
1634 | fail: | |
1635 | __free_pred_stack(&stack); | |
1636 | return err; | |
7ce7e424 TZ |
1637 | } |
1638 | ||
75b8e982 SR |
1639 | struct filter_list { |
1640 | struct list_head list; | |
1641 | struct event_filter *filter; | |
1642 | }; | |
1643 | ||
fce29d15 LZ |
1644 | static int replace_system_preds(struct event_subsystem *system, |
1645 | struct filter_parse_state *ps, | |
1646 | char *filter_string) | |
1647 | { | |
1648 | struct ftrace_event_call *call; | |
75b8e982 SR |
1649 | struct filter_list *filter_item; |
1650 | struct filter_list *tmp; | |
1651 | LIST_HEAD(filter_list); | |
fce29d15 | 1652 | bool fail = true; |
a66abe7f | 1653 | int err; |
fce29d15 LZ |
1654 | |
1655 | list_for_each_entry(call, &ftrace_events, list) { | |
1656 | ||
8f082018 | 1657 | if (strcmp(call->class->system, system->name) != 0) |
fce29d15 LZ |
1658 | continue; |
1659 | ||
75b8e982 SR |
1660 | /* |
1661 | * Try to see if the filter can be applied | |
1662 | * (filter arg is ignored on dry_run) | |
1663 | */ | |
1664 | err = replace_preds(call, NULL, ps, filter_string, true); | |
fce29d15 | 1665 | if (err) |
ed0449af LZ |
1666 | call->flags |= TRACE_EVENT_FL_NO_SET_FILTER; |
1667 | else | |
1668 | call->flags &= ~TRACE_EVENT_FL_NO_SET_FILTER; | |
0fc3ca9a SR |
1669 | } |
1670 | ||
0fc3ca9a | 1671 | list_for_each_entry(call, &ftrace_events, list) { |
75b8e982 | 1672 | struct event_filter *filter; |
0fc3ca9a SR |
1673 | |
1674 | if (strcmp(call->class->system, system->name) != 0) | |
1675 | continue; | |
1676 | ||
ed0449af LZ |
1677 | if (call->flags & TRACE_EVENT_FL_NO_SET_FILTER) |
1678 | continue; | |
1679 | ||
75b8e982 SR |
1680 | filter_item = kzalloc(sizeof(*filter_item), GFP_KERNEL); |
1681 | if (!filter_item) | |
1682 | goto fail_mem; | |
0fc3ca9a | 1683 | |
75b8e982 | 1684 | list_add_tail(&filter_item->list, &filter_list); |
0fc3ca9a | 1685 | |
75b8e982 SR |
1686 | filter_item->filter = __alloc_filter(); |
1687 | if (!filter_item->filter) | |
1688 | goto fail_mem; | |
1689 | filter = filter_item->filter; | |
0fc3ca9a | 1690 | |
75b8e982 SR |
1691 | /* Can only fail on no memory */ |
1692 | err = replace_filter_string(filter, filter_string); | |
1693 | if (err) | |
1694 | goto fail_mem; | |
fce29d15 | 1695 | |
6fb2915d | 1696 | err = replace_preds(call, filter, ps, filter_string, false); |
75b8e982 SR |
1697 | if (err) { |
1698 | filter_disable(call); | |
1699 | parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0); | |
1700 | append_filter_err(ps, filter); | |
1701 | } else | |
553552ce | 1702 | call->flags |= TRACE_EVENT_FL_FILTERED; |
75b8e982 SR |
1703 | /* |
1704 | * Regardless of if this returned an error, we still | |
1705 | * replace the filter for the call. | |
1706 | */ | |
1707 | filter = call->filter; | |
d3d9acf6 | 1708 | rcu_assign_pointer(call->filter, filter_item->filter); |
75b8e982 SR |
1709 | filter_item->filter = filter; |
1710 | ||
fce29d15 LZ |
1711 | fail = false; |
1712 | } | |
1713 | ||
0fc3ca9a SR |
1714 | if (fail) |
1715 | goto fail; | |
1716 | ||
75b8e982 SR |
1717 | /* |
1718 | * The calls can still be using the old filters. | |
1719 | * Do a synchronize_sched() to ensure all calls are | |
1720 | * done with them before we free them. | |
1721 | */ | |
1722 | synchronize_sched(); | |
1723 | list_for_each_entry_safe(filter_item, tmp, &filter_list, list) { | |
1724 | __free_filter(filter_item->filter); | |
1725 | list_del(&filter_item->list); | |
1726 | kfree(filter_item); | |
1727 | } | |
fce29d15 | 1728 | return 0; |
0fc3ca9a | 1729 | fail: |
75b8e982 SR |
1730 | /* No call succeeded */ |
1731 | list_for_each_entry_safe(filter_item, tmp, &filter_list, list) { | |
1732 | list_del(&filter_item->list); | |
1733 | kfree(filter_item); | |
1734 | } | |
0fc3ca9a SR |
1735 | parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0); |
1736 | return -EINVAL; | |
75b8e982 SR |
1737 | fail_mem: |
1738 | /* If any call succeeded, we still need to sync */ | |
1739 | if (!fail) | |
1740 | synchronize_sched(); | |
1741 | list_for_each_entry_safe(filter_item, tmp, &filter_list, list) { | |
1742 | __free_filter(filter_item->filter); | |
1743 | list_del(&filter_item->list); | |
1744 | kfree(filter_item); | |
1745 | } | |
1746 | return -ENOMEM; | |
fce29d15 LZ |
1747 | } |
1748 | ||
38b78eb8 TH |
1749 | static int create_filter_start(char *filter_str, bool set_str, |
1750 | struct filter_parse_state **psp, | |
1751 | struct event_filter **filterp) | |
1752 | { | |
1753 | struct event_filter *filter; | |
1754 | struct filter_parse_state *ps = NULL; | |
1755 | int err = 0; | |
1756 | ||
1757 | WARN_ON_ONCE(*psp || *filterp); | |
1758 | ||
1759 | /* allocate everything, and if any fails, free all and fail */ | |
1760 | filter = __alloc_filter(); | |
1761 | if (filter && set_str) | |
1762 | err = replace_filter_string(filter, filter_str); | |
1763 | ||
1764 | ps = kzalloc(sizeof(*ps), GFP_KERNEL); | |
1765 | ||
1766 | if (!filter || !ps || err) { | |
1767 | kfree(ps); | |
1768 | __free_filter(filter); | |
1769 | return -ENOMEM; | |
1770 | } | |
1771 | ||
1772 | /* we're committed to creating a new filter */ | |
1773 | *filterp = filter; | |
1774 | *psp = ps; | |
1775 | ||
1776 | parse_init(ps, filter_ops, filter_str); | |
1777 | err = filter_parse(ps); | |
1778 | if (err && set_str) | |
1779 | append_filter_err(ps, filter); | |
1780 | return err; | |
1781 | } | |
1782 | ||
1783 | static void create_filter_finish(struct filter_parse_state *ps) | |
1784 | { | |
1785 | if (ps) { | |
1786 | filter_opstack_clear(ps); | |
1787 | postfix_clear(ps); | |
1788 | kfree(ps); | |
1789 | } | |
1790 | } | |
1791 | ||
1792 | /** | |
1793 | * create_filter - create a filter for a ftrace_event_call | |
1794 | * @call: ftrace_event_call to create a filter for | |
1795 | * @filter_str: filter string | |
1796 | * @set_str: remember @filter_str and enable detailed error in filter | |
1797 | * @filterp: out param for created filter (always updated on return) | |
1798 | * | |
1799 | * Creates a filter for @call with @filter_str. If @set_str is %true, | |
1800 | * @filter_str is copied and recorded in the new filter. | |
1801 | * | |
1802 | * On success, returns 0 and *@filterp points to the new filter. On | |
1803 | * failure, returns -errno and *@filterp may point to %NULL or to a new | |
1804 | * filter. In the latter case, the returned filter contains error | |
1805 | * information if @set_str is %true and the caller is responsible for | |
1806 | * freeing it. | |
1807 | */ | |
1808 | static int create_filter(struct ftrace_event_call *call, | |
1809 | char *filter_str, bool set_str, | |
1810 | struct event_filter **filterp) | |
1811 | { | |
1812 | struct event_filter *filter = NULL; | |
1813 | struct filter_parse_state *ps = NULL; | |
1814 | int err; | |
1815 | ||
1816 | err = create_filter_start(filter_str, set_str, &ps, &filter); | |
1817 | if (!err) { | |
1818 | err = replace_preds(call, filter, ps, filter_str, false); | |
1819 | if (err && set_str) | |
1820 | append_filter_err(ps, filter); | |
1821 | } | |
1822 | create_filter_finish(ps); | |
1823 | ||
1824 | *filterp = filter; | |
1825 | return err; | |
1826 | } | |
1827 | ||
1828 | /** | |
1829 | * create_system_filter - create a filter for an event_subsystem | |
1830 | * @system: event_subsystem to create a filter for | |
1831 | * @filter_str: filter string | |
1832 | * @filterp: out param for created filter (always updated on return) | |
1833 | * | |
1834 | * Identical to create_filter() except that it creates a subsystem filter | |
1835 | * and always remembers @filter_str. | |
1836 | */ | |
1837 | static int create_system_filter(struct event_subsystem *system, | |
1838 | char *filter_str, struct event_filter **filterp) | |
1839 | { | |
1840 | struct event_filter *filter = NULL; | |
1841 | struct filter_parse_state *ps = NULL; | |
1842 | int err; | |
1843 | ||
1844 | err = create_filter_start(filter_str, true, &ps, &filter); | |
1845 | if (!err) { | |
1846 | err = replace_system_preds(system, ps, filter_str); | |
1847 | if (!err) { | |
1848 | /* System filters just show a default message */ | |
1849 | kfree(filter->filter_string); | |
1850 | filter->filter_string = NULL; | |
1851 | } else { | |
1852 | append_filter_err(ps, filter); | |
1853 | } | |
1854 | } | |
1855 | create_filter_finish(ps); | |
1856 | ||
1857 | *filterp = filter; | |
1858 | return err; | |
1859 | } | |
1860 | ||
8b372562 TZ |
1861 | int apply_event_filter(struct ftrace_event_call *call, char *filter_string) |
1862 | { | |
75b8e982 | 1863 | struct event_filter *filter; |
75b8e982 | 1864 | int err = 0; |
8b372562 | 1865 | |
00e95830 | 1866 | mutex_lock(&event_mutex); |
8b372562 TZ |
1867 | |
1868 | if (!strcmp(strstrip(filter_string), "0")) { | |
75b8e982 SR |
1869 | filter_disable(call); |
1870 | filter = call->filter; | |
1871 | if (!filter) | |
1872 | goto out_unlock; | |
d3d9acf6 | 1873 | RCU_INIT_POINTER(call->filter, NULL); |
f76690af SR |
1874 | /* Make sure the filter is not being used */ |
1875 | synchronize_sched(); | |
75b8e982 | 1876 | __free_filter(filter); |
a66abe7f | 1877 | goto out_unlock; |
8b372562 TZ |
1878 | } |
1879 | ||
38b78eb8 | 1880 | err = create_filter(call, filter_string, true, &filter); |
8b372562 | 1881 | |
75b8e982 SR |
1882 | /* |
1883 | * Always swap the call filter with the new filter | |
1884 | * even if there was an error. If there was an error | |
1885 | * in the filter, we disable the filter and show the error | |
1886 | * string | |
1887 | */ | |
38b78eb8 TH |
1888 | if (filter) { |
1889 | struct event_filter *tmp = call->filter; | |
1890 | ||
1891 | if (!err) | |
1892 | call->flags |= TRACE_EVENT_FL_FILTERED; | |
1893 | else | |
1894 | filter_disable(call); | |
1895 | ||
1896 | rcu_assign_pointer(call->filter, filter); | |
1897 | ||
1898 | if (tmp) { | |
1899 | /* Make sure the call is done with the filter */ | |
1900 | synchronize_sched(); | |
1901 | __free_filter(tmp); | |
1902 | } | |
75b8e982 | 1903 | } |
8cd995b6 | 1904 | out_unlock: |
00e95830 | 1905 | mutex_unlock(&event_mutex); |
8b372562 TZ |
1906 | |
1907 | return err; | |
1908 | } | |
1909 | ||
1910 | int apply_subsystem_event_filter(struct event_subsystem *system, | |
1911 | char *filter_string) | |
1912 | { | |
75b8e982 SR |
1913 | struct event_filter *filter; |
1914 | int err = 0; | |
8b372562 | 1915 | |
00e95830 | 1916 | mutex_lock(&event_mutex); |
8b372562 | 1917 | |
e9dbfae5 SR |
1918 | /* Make sure the system still has events */ |
1919 | if (!system->nr_events) { | |
1920 | err = -ENODEV; | |
1921 | goto out_unlock; | |
1922 | } | |
1923 | ||
8b372562 | 1924 | if (!strcmp(strstrip(filter_string), "0")) { |
fce29d15 | 1925 | filter_free_subsystem_preds(system); |
8b372562 | 1926 | remove_filter_string(system->filter); |
75b8e982 SR |
1927 | filter = system->filter; |
1928 | system->filter = NULL; | |
1929 | /* Ensure all filters are no longer used */ | |
1930 | synchronize_sched(); | |
1931 | filter_free_subsystem_filters(system); | |
1932 | __free_filter(filter); | |
a66abe7f | 1933 | goto out_unlock; |
8b372562 TZ |
1934 | } |
1935 | ||
38b78eb8 TH |
1936 | err = create_system_filter(system, filter_string, &filter); |
1937 | if (filter) { | |
1938 | /* | |
1939 | * No event actually uses the system filter | |
1940 | * we can free it without synchronize_sched(). | |
1941 | */ | |
1942 | __free_filter(system->filter); | |
1943 | system->filter = filter; | |
1944 | } | |
8cd995b6 | 1945 | out_unlock: |
00e95830 | 1946 | mutex_unlock(&event_mutex); |
8b372562 TZ |
1947 | |
1948 | return err; | |
1949 | } | |
7ce7e424 | 1950 | |
07b139c8 | 1951 | #ifdef CONFIG_PERF_EVENTS |
6fb2915d LZ |
1952 | |
1953 | void ftrace_profile_free_filter(struct perf_event *event) | |
1954 | { | |
1955 | struct event_filter *filter = event->filter; | |
1956 | ||
1957 | event->filter = NULL; | |
c9c53ca0 | 1958 | __free_filter(filter); |
6fb2915d LZ |
1959 | } |
1960 | ||
5500fa51 JO |
1961 | struct function_filter_data { |
1962 | struct ftrace_ops *ops; | |
1963 | int first_filter; | |
1964 | int first_notrace; | |
1965 | }; | |
1966 | ||
1967 | #ifdef CONFIG_FUNCTION_TRACER | |
1968 | static char ** | |
1969 | ftrace_function_filter_re(char *buf, int len, int *count) | |
1970 | { | |
1971 | char *str, *sep, **re; | |
1972 | ||
1973 | str = kstrndup(buf, len, GFP_KERNEL); | |
1974 | if (!str) | |
1975 | return NULL; | |
1976 | ||
1977 | /* | |
1978 | * The argv_split function takes white space | |
1979 | * as a separator, so convert ',' into spaces. | |
1980 | */ | |
1981 | while ((sep = strchr(str, ','))) | |
1982 | *sep = ' '; | |
1983 | ||
1984 | re = argv_split(GFP_KERNEL, str, count); | |
1985 | kfree(str); | |
1986 | return re; | |
1987 | } | |
1988 | ||
1989 | static int ftrace_function_set_regexp(struct ftrace_ops *ops, int filter, | |
1990 | int reset, char *re, int len) | |
1991 | { | |
1992 | int ret; | |
1993 | ||
1994 | if (filter) | |
1995 | ret = ftrace_set_filter(ops, re, len, reset); | |
1996 | else | |
1997 | ret = ftrace_set_notrace(ops, re, len, reset); | |
1998 | ||
1999 | return ret; | |
2000 | } | |
2001 | ||
2002 | static int __ftrace_function_set_filter(int filter, char *buf, int len, | |
2003 | struct function_filter_data *data) | |
2004 | { | |
92d8d4a8 | 2005 | int i, re_cnt, ret = -EINVAL; |
5500fa51 JO |
2006 | int *reset; |
2007 | char **re; | |
2008 | ||
2009 | reset = filter ? &data->first_filter : &data->first_notrace; | |
2010 | ||
2011 | /* | |
2012 | * The 'ip' field could have multiple filters set, separated | |
2013 | * either by space or comma. We first cut the filter and apply | |
2014 | * all pieces separatelly. | |
2015 | */ | |
2016 | re = ftrace_function_filter_re(buf, len, &re_cnt); | |
2017 | if (!re) | |
2018 | return -EINVAL; | |
2019 | ||
2020 | for (i = 0; i < re_cnt; i++) { | |
2021 | ret = ftrace_function_set_regexp(data->ops, filter, *reset, | |
2022 | re[i], strlen(re[i])); | |
2023 | if (ret) | |
2024 | break; | |
2025 | ||
2026 | if (*reset) | |
2027 | *reset = 0; | |
2028 | } | |
2029 | ||
2030 | argv_free(re); | |
2031 | return ret; | |
2032 | } | |
2033 | ||
2034 | static int ftrace_function_check_pred(struct filter_pred *pred, int leaf) | |
2035 | { | |
2036 | struct ftrace_event_field *field = pred->field; | |
2037 | ||
2038 | if (leaf) { | |
2039 | /* | |
2040 | * Check the leaf predicate for function trace, verify: | |
2041 | * - only '==' and '!=' is used | |
2042 | * - the 'ip' field is used | |
2043 | */ | |
2044 | if ((pred->op != OP_EQ) && (pred->op != OP_NE)) | |
2045 | return -EINVAL; | |
2046 | ||
2047 | if (strcmp(field->name, "ip")) | |
2048 | return -EINVAL; | |
2049 | } else { | |
2050 | /* | |
2051 | * Check the non leaf predicate for function trace, verify: | |
2052 | * - only '||' is used | |
2053 | */ | |
2054 | if (pred->op != OP_OR) | |
2055 | return -EINVAL; | |
2056 | } | |
2057 | ||
2058 | return 0; | |
2059 | } | |
2060 | ||
2061 | static int ftrace_function_set_filter_cb(enum move_type move, | |
2062 | struct filter_pred *pred, | |
2063 | int *err, void *data) | |
2064 | { | |
2065 | /* Checking the node is valid for function trace. */ | |
2066 | if ((move != MOVE_DOWN) || | |
2067 | (pred->left != FILTER_PRED_INVALID)) { | |
2068 | *err = ftrace_function_check_pred(pred, 0); | |
2069 | } else { | |
2070 | *err = ftrace_function_check_pred(pred, 1); | |
2071 | if (*err) | |
2072 | return WALK_PRED_ABORT; | |
2073 | ||
2074 | *err = __ftrace_function_set_filter(pred->op == OP_EQ, | |
2075 | pred->regex.pattern, | |
2076 | pred->regex.len, | |
2077 | data); | |
2078 | } | |
2079 | ||
2080 | return (*err) ? WALK_PRED_ABORT : WALK_PRED_DEFAULT; | |
2081 | } | |
2082 | ||
2083 | static int ftrace_function_set_filter(struct perf_event *event, | |
2084 | struct event_filter *filter) | |
2085 | { | |
2086 | struct function_filter_data data = { | |
2087 | .first_filter = 1, | |
2088 | .first_notrace = 1, | |
2089 | .ops = &event->ftrace_ops, | |
2090 | }; | |
2091 | ||
2092 | return walk_pred_tree(filter->preds, filter->root, | |
2093 | ftrace_function_set_filter_cb, &data); | |
2094 | } | |
2095 | #else | |
2096 | static int ftrace_function_set_filter(struct perf_event *event, | |
2097 | struct event_filter *filter) | |
2098 | { | |
2099 | return -ENODEV; | |
2100 | } | |
2101 | #endif /* CONFIG_FUNCTION_TRACER */ | |
2102 | ||
6fb2915d LZ |
2103 | int ftrace_profile_set_filter(struct perf_event *event, int event_id, |
2104 | char *filter_str) | |
2105 | { | |
2106 | int err; | |
2107 | struct event_filter *filter; | |
3f78f935 | 2108 | struct ftrace_event_call *call; |
6fb2915d LZ |
2109 | |
2110 | mutex_lock(&event_mutex); | |
2111 | ||
3f78f935 | 2112 | call = event->tp_event; |
a66abe7f IM |
2113 | |
2114 | err = -EINVAL; | |
3f78f935 | 2115 | if (!call) |
a66abe7f | 2116 | goto out_unlock; |
6fb2915d | 2117 | |
a66abe7f | 2118 | err = -EEXIST; |
6fb2915d | 2119 | if (event->filter) |
a66abe7f | 2120 | goto out_unlock; |
6fb2915d | 2121 | |
38b78eb8 | 2122 | err = create_filter(call, filter_str, false, &filter); |
5500fa51 JO |
2123 | if (err) |
2124 | goto free_filter; | |
2125 | ||
2126 | if (ftrace_event_is_function(call)) | |
2127 | err = ftrace_function_set_filter(event, filter); | |
38b78eb8 | 2128 | else |
5500fa51 JO |
2129 | event->filter = filter; |
2130 | ||
2131 | free_filter: | |
2132 | if (err || ftrace_event_is_function(call)) | |
c9c53ca0 | 2133 | __free_filter(filter); |
6fb2915d | 2134 | |
a66abe7f | 2135 | out_unlock: |
6fb2915d LZ |
2136 | mutex_unlock(&event_mutex); |
2137 | ||
2138 | return err; | |
2139 | } | |
2140 | ||
07b139c8 | 2141 | #endif /* CONFIG_PERF_EVENTS */ |
6fb2915d | 2142 | |
1d0e78e3 JO |
2143 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
2144 | ||
2145 | #include <linux/types.h> | |
2146 | #include <linux/tracepoint.h> | |
2147 | ||
2148 | #define CREATE_TRACE_POINTS | |
2149 | #include "trace_events_filter_test.h" | |
2150 | ||
1d0e78e3 JO |
2151 | #define DATA_REC(m, va, vb, vc, vd, ve, vf, vg, vh, nvisit) \ |
2152 | { \ | |
2153 | .filter = FILTER, \ | |
2154 | .rec = { .a = va, .b = vb, .c = vc, .d = vd, \ | |
2155 | .e = ve, .f = vf, .g = vg, .h = vh }, \ | |
2156 | .match = m, \ | |
2157 | .not_visited = nvisit, \ | |
2158 | } | |
2159 | #define YES 1 | |
2160 | #define NO 0 | |
2161 | ||
2162 | static struct test_filter_data_t { | |
2163 | char *filter; | |
2164 | struct ftrace_raw_ftrace_test_filter rec; | |
2165 | int match; | |
2166 | char *not_visited; | |
2167 | } test_filter_data[] = { | |
2168 | #define FILTER "a == 1 && b == 1 && c == 1 && d == 1 && " \ | |
2169 | "e == 1 && f == 1 && g == 1 && h == 1" | |
2170 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, ""), | |
2171 | DATA_REC(NO, 0, 1, 1, 1, 1, 1, 1, 1, "bcdefgh"), | |
2172 | DATA_REC(NO, 1, 1, 1, 1, 1, 1, 1, 0, ""), | |
2173 | #undef FILTER | |
2174 | #define FILTER "a == 1 || b == 1 || c == 1 || d == 1 || " \ | |
2175 | "e == 1 || f == 1 || g == 1 || h == 1" | |
2176 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""), | |
2177 | DATA_REC(YES, 0, 0, 0, 0, 0, 0, 0, 1, ""), | |
2178 | DATA_REC(YES, 1, 0, 0, 0, 0, 0, 0, 0, "bcdefgh"), | |
2179 | #undef FILTER | |
2180 | #define FILTER "(a == 1 || b == 1) && (c == 1 || d == 1) && " \ | |
2181 | "(e == 1 || f == 1) && (g == 1 || h == 1)" | |
2182 | DATA_REC(NO, 0, 0, 1, 1, 1, 1, 1, 1, "dfh"), | |
2183 | DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""), | |
2184 | DATA_REC(YES, 1, 0, 1, 0, 0, 1, 0, 1, "bd"), | |
2185 | DATA_REC(NO, 1, 0, 1, 0, 0, 1, 0, 0, "bd"), | |
2186 | #undef FILTER | |
2187 | #define FILTER "(a == 1 && b == 1) || (c == 1 && d == 1) || " \ | |
2188 | "(e == 1 && f == 1) || (g == 1 && h == 1)" | |
2189 | DATA_REC(YES, 1, 0, 1, 1, 1, 1, 1, 1, "efgh"), | |
2190 | DATA_REC(YES, 0, 0, 0, 0, 0, 0, 1, 1, ""), | |
2191 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""), | |
2192 | #undef FILTER | |
2193 | #define FILTER "(a == 1 && b == 1) && (c == 1 && d == 1) && " \ | |
2194 | "(e == 1 && f == 1) || (g == 1 && h == 1)" | |
2195 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 0, "gh"), | |
2196 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""), | |
2197 | DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, ""), | |
2198 | #undef FILTER | |
2199 | #define FILTER "((a == 1 || b == 1) || (c == 1 || d == 1) || " \ | |
2200 | "(e == 1 || f == 1)) && (g == 1 || h == 1)" | |
2201 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 1, "bcdef"), | |
2202 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""), | |
2203 | DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, "h"), | |
2204 | #undef FILTER | |
2205 | #define FILTER "((((((((a == 1) && (b == 1)) || (c == 1)) && (d == 1)) || " \ | |
2206 | "(e == 1)) && (f == 1)) || (g == 1)) && (h == 1))" | |
2207 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "ceg"), | |
2208 | DATA_REC(NO, 0, 1, 0, 1, 0, 1, 0, 1, ""), | |
2209 | DATA_REC(NO, 1, 0, 1, 0, 1, 0, 1, 0, ""), | |
2210 | #undef FILTER | |
2211 | #define FILTER "((((((((a == 1) || (b == 1)) && (c == 1)) || (d == 1)) && " \ | |
2212 | "(e == 1)) || (f == 1)) && (g == 1)) || (h == 1))" | |
2213 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "bdfh"), | |
2214 | DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""), | |
2215 | DATA_REC(YES, 1, 0, 1, 0, 1, 0, 1, 0, "bdfh"), | |
2216 | }; | |
2217 | ||
2218 | #undef DATA_REC | |
2219 | #undef FILTER | |
2220 | #undef YES | |
2221 | #undef NO | |
2222 | ||
2223 | #define DATA_CNT (sizeof(test_filter_data)/sizeof(struct test_filter_data_t)) | |
2224 | ||
2225 | static int test_pred_visited; | |
2226 | ||
2227 | static int test_pred_visited_fn(struct filter_pred *pred, void *event) | |
2228 | { | |
2229 | struct ftrace_event_field *field = pred->field; | |
2230 | ||
2231 | test_pred_visited = 1; | |
2232 | printk(KERN_INFO "\npred visited %s\n", field->name); | |
2233 | return 1; | |
2234 | } | |
2235 | ||
2236 | static int test_walk_pred_cb(enum move_type move, struct filter_pred *pred, | |
2237 | int *err, void *data) | |
2238 | { | |
2239 | char *fields = data; | |
2240 | ||
2241 | if ((move == MOVE_DOWN) && | |
2242 | (pred->left == FILTER_PRED_INVALID)) { | |
2243 | struct ftrace_event_field *field = pred->field; | |
2244 | ||
2245 | if (!field) { | |
2246 | WARN(1, "all leafs should have field defined"); | |
2247 | return WALK_PRED_DEFAULT; | |
2248 | } | |
2249 | if (!strchr(fields, *field->name)) | |
2250 | return WALK_PRED_DEFAULT; | |
2251 | ||
2252 | WARN_ON(!pred->fn); | |
2253 | pred->fn = test_pred_visited_fn; | |
2254 | } | |
2255 | return WALK_PRED_DEFAULT; | |
2256 | } | |
2257 | ||
2258 | static __init int ftrace_test_event_filter(void) | |
2259 | { | |
2260 | int i; | |
2261 | ||
2262 | printk(KERN_INFO "Testing ftrace filter: "); | |
2263 | ||
2264 | for (i = 0; i < DATA_CNT; i++) { | |
2265 | struct event_filter *filter = NULL; | |
2266 | struct test_filter_data_t *d = &test_filter_data[i]; | |
2267 | int err; | |
2268 | ||
38b78eb8 TH |
2269 | err = create_filter(&event_ftrace_test_filter, d->filter, |
2270 | false, &filter); | |
1d0e78e3 JO |
2271 | if (err) { |
2272 | printk(KERN_INFO | |
2273 | "Failed to get filter for '%s', err %d\n", | |
2274 | d->filter, err); | |
38b78eb8 | 2275 | __free_filter(filter); |
1d0e78e3 JO |
2276 | break; |
2277 | } | |
2278 | ||
86b6ef21 SR |
2279 | /* |
2280 | * The preemption disabling is not really needed for self | |
2281 | * tests, but the rcu dereference will complain without it. | |
2282 | */ | |
2283 | preempt_disable(); | |
1d0e78e3 JO |
2284 | if (*d->not_visited) |
2285 | walk_pred_tree(filter->preds, filter->root, | |
2286 | test_walk_pred_cb, | |
2287 | d->not_visited); | |
2288 | ||
2289 | test_pred_visited = 0; | |
2290 | err = filter_match_preds(filter, &d->rec); | |
86b6ef21 | 2291 | preempt_enable(); |
1d0e78e3 JO |
2292 | |
2293 | __free_filter(filter); | |
2294 | ||
2295 | if (test_pred_visited) { | |
2296 | printk(KERN_INFO | |
2297 | "Failed, unwanted pred visited for filter %s\n", | |
2298 | d->filter); | |
2299 | break; | |
2300 | } | |
2301 | ||
2302 | if (err != d->match) { | |
2303 | printk(KERN_INFO | |
2304 | "Failed to match filter '%s', expected %d\n", | |
2305 | d->filter, d->match); | |
2306 | break; | |
2307 | } | |
2308 | } | |
2309 | ||
2310 | if (i == DATA_CNT) | |
2311 | printk(KERN_CONT "OK\n"); | |
2312 | ||
2313 | return 0; | |
2314 | } | |
2315 | ||
2316 | late_initcall(ftrace_test_event_filter); | |
2317 | ||
2318 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |