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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, | |
1a891cf1 | 47 | OP_BAND, |
e12c09cf | 48 | OP_NOT, |
8b372562 TZ |
49 | OP_NONE, |
50 | OP_OPEN_PAREN, | |
51 | }; | |
52 | ||
53 | struct filter_op { | |
54 | int id; | |
55 | char *string; | |
56 | int precedence; | |
57 | }; | |
58 | ||
1a891cf1 | 59 | /* Order must be the same as enum filter_op_ids above */ |
8b372562 | 60 | static struct filter_op filter_ops[] = { |
b0f1a59a LZ |
61 | { OP_OR, "||", 1 }, |
62 | { OP_AND, "&&", 2 }, | |
63 | { OP_GLOB, "~", 4 }, | |
64 | { OP_NE, "!=", 4 }, | |
65 | { OP_EQ, "==", 4 }, | |
66 | { OP_LT, "<", 5 }, | |
67 | { OP_LE, "<=", 5 }, | |
68 | { OP_GT, ">", 5 }, | |
69 | { OP_GE, ">=", 5 }, | |
1a891cf1 | 70 | { OP_BAND, "&", 6 }, |
e12c09cf | 71 | { OP_NOT, "!", 6 }, |
b0f1a59a LZ |
72 | { OP_NONE, "OP_NONE", 0 }, |
73 | { OP_OPEN_PAREN, "(", 0 }, | |
8b372562 TZ |
74 | }; |
75 | ||
76 | enum { | |
77 | FILT_ERR_NONE, | |
78 | FILT_ERR_INVALID_OP, | |
79 | FILT_ERR_UNBALANCED_PAREN, | |
80 | FILT_ERR_TOO_MANY_OPERANDS, | |
81 | FILT_ERR_OPERAND_TOO_LONG, | |
82 | FILT_ERR_FIELD_NOT_FOUND, | |
83 | FILT_ERR_ILLEGAL_FIELD_OP, | |
84 | FILT_ERR_ILLEGAL_INTVAL, | |
85 | FILT_ERR_BAD_SUBSYS_FILTER, | |
86 | FILT_ERR_TOO_MANY_PREDS, | |
87 | FILT_ERR_MISSING_FIELD, | |
88 | FILT_ERR_INVALID_FILTER, | |
5500fa51 | 89 | FILT_ERR_IP_FIELD_ONLY, |
e12c09cf | 90 | FILT_ERR_ILLEGAL_NOT_OP, |
8b372562 TZ |
91 | }; |
92 | ||
93 | static char *err_text[] = { | |
94 | "No error", | |
95 | "Invalid operator", | |
96 | "Unbalanced parens", | |
97 | "Too many operands", | |
98 | "Operand too long", | |
99 | "Field not found", | |
100 | "Illegal operation for field type", | |
101 | "Illegal integer value", | |
102 | "Couldn't find or set field in one of a subsystem's events", | |
103 | "Too many terms in predicate expression", | |
104 | "Missing field name and/or value", | |
105 | "Meaningless filter expression", | |
5500fa51 | 106 | "Only 'ip' field is supported for function trace", |
e12c09cf | 107 | "Illegal use of '!'", |
8b372562 TZ |
108 | }; |
109 | ||
110 | struct opstack_op { | |
111 | int op; | |
112 | struct list_head list; | |
113 | }; | |
114 | ||
115 | struct postfix_elt { | |
116 | int op; | |
117 | char *operand; | |
118 | struct list_head list; | |
119 | }; | |
120 | ||
121 | struct filter_parse_state { | |
122 | struct filter_op *ops; | |
123 | struct list_head opstack; | |
124 | struct list_head postfix; | |
125 | int lasterr; | |
126 | int lasterr_pos; | |
127 | ||
128 | struct { | |
129 | char *string; | |
130 | unsigned int cnt; | |
131 | unsigned int tail; | |
132 | } infix; | |
133 | ||
134 | struct { | |
135 | char string[MAX_FILTER_STR_VAL]; | |
136 | int pos; | |
137 | unsigned int tail; | |
138 | } operand; | |
139 | }; | |
140 | ||
61e9dea2 SR |
141 | struct pred_stack { |
142 | struct filter_pred **preds; | |
143 | int index; | |
144 | }; | |
145 | ||
e12c09cf | 146 | /* If not of not match is equal to not of not, then it is a match */ |
197e2eab | 147 | #define DEFINE_COMPARISON_PRED(type) \ |
58d9a597 | 148 | static int filter_pred_##type(struct filter_pred *pred, void *event) \ |
197e2eab LZ |
149 | { \ |
150 | type *addr = (type *)(event + pred->offset); \ | |
151 | type val = (type)pred->val; \ | |
152 | int match = 0; \ | |
153 | \ | |
154 | switch (pred->op) { \ | |
155 | case OP_LT: \ | |
156 | match = (*addr < val); \ | |
157 | break; \ | |
158 | case OP_LE: \ | |
159 | match = (*addr <= val); \ | |
160 | break; \ | |
161 | case OP_GT: \ | |
162 | match = (*addr > val); \ | |
163 | break; \ | |
164 | case OP_GE: \ | |
165 | match = (*addr >= val); \ | |
166 | break; \ | |
1a891cf1 SR |
167 | case OP_BAND: \ |
168 | match = (*addr & val); \ | |
169 | break; \ | |
197e2eab LZ |
170 | default: \ |
171 | break; \ | |
172 | } \ | |
173 | \ | |
e12c09cf | 174 | return !!match == !pred->not; \ |
197e2eab LZ |
175 | } |
176 | ||
177 | #define DEFINE_EQUALITY_PRED(size) \ | |
58d9a597 | 178 | static int filter_pred_##size(struct filter_pred *pred, void *event) \ |
197e2eab LZ |
179 | { \ |
180 | u##size *addr = (u##size *)(event + pred->offset); \ | |
181 | u##size val = (u##size)pred->val; \ | |
182 | int match; \ | |
183 | \ | |
184 | match = (val == *addr) ^ pred->not; \ | |
185 | \ | |
186 | return match; \ | |
187 | } | |
188 | ||
8b372562 TZ |
189 | DEFINE_COMPARISON_PRED(s64); |
190 | DEFINE_COMPARISON_PRED(u64); | |
191 | DEFINE_COMPARISON_PRED(s32); | |
192 | DEFINE_COMPARISON_PRED(u32); | |
193 | DEFINE_COMPARISON_PRED(s16); | |
194 | DEFINE_COMPARISON_PRED(u16); | |
195 | DEFINE_COMPARISON_PRED(s8); | |
196 | DEFINE_COMPARISON_PRED(u8); | |
197 | ||
198 | DEFINE_EQUALITY_PRED(64); | |
199 | DEFINE_EQUALITY_PRED(32); | |
200 | DEFINE_EQUALITY_PRED(16); | |
201 | DEFINE_EQUALITY_PRED(8); | |
202 | ||
e8808c10 | 203 | /* Filter predicate for fixed sized arrays of characters */ |
58d9a597 | 204 | static int filter_pred_string(struct filter_pred *pred, void *event) |
7ce7e424 TZ |
205 | { |
206 | char *addr = (char *)(event + pred->offset); | |
207 | int cmp, match; | |
208 | ||
1889d209 | 209 | cmp = pred->regex.match(addr, &pred->regex, pred->regex.field_len); |
7ce7e424 | 210 | |
1889d209 | 211 | match = cmp ^ pred->not; |
7ce7e424 TZ |
212 | |
213 | return match; | |
214 | } | |
215 | ||
87a342f5 | 216 | /* Filter predicate for char * pointers */ |
58d9a597 | 217 | static int filter_pred_pchar(struct filter_pred *pred, void *event) |
87a342f5 LZ |
218 | { |
219 | char **addr = (char **)(event + pred->offset); | |
220 | int cmp, match; | |
16da27a8 | 221 | int len = strlen(*addr) + 1; /* including tailing '\0' */ |
87a342f5 | 222 | |
16da27a8 | 223 | cmp = pred->regex.match(*addr, &pred->regex, len); |
87a342f5 | 224 | |
1889d209 | 225 | match = cmp ^ pred->not; |
87a342f5 LZ |
226 | |
227 | return match; | |
228 | } | |
229 | ||
e8808c10 FW |
230 | /* |
231 | * Filter predicate for dynamic sized arrays of characters. | |
232 | * These are implemented through a list of strings at the end | |
233 | * of the entry. | |
234 | * Also each of these strings have a field in the entry which | |
235 | * contains its offset from the beginning of the entry. | |
236 | * We have then first to get this field, dereference it | |
237 | * and add it to the address of the entry, and at last we have | |
238 | * the address of the string. | |
239 | */ | |
58d9a597 | 240 | static int filter_pred_strloc(struct filter_pred *pred, void *event) |
e8808c10 | 241 | { |
7d536cb3 LZ |
242 | u32 str_item = *(u32 *)(event + pred->offset); |
243 | int str_loc = str_item & 0xffff; | |
244 | int str_len = str_item >> 16; | |
e8808c10 FW |
245 | char *addr = (char *)(event + str_loc); |
246 | int cmp, match; | |
247 | ||
1889d209 | 248 | cmp = pred->regex.match(addr, &pred->regex, str_len); |
e8808c10 | 249 | |
1889d209 | 250 | match = cmp ^ pred->not; |
e8808c10 FW |
251 | |
252 | return match; | |
253 | } | |
254 | ||
58d9a597 | 255 | static int filter_pred_none(struct filter_pred *pred, void *event) |
0a19e53c TZ |
256 | { |
257 | return 0; | |
258 | } | |
259 | ||
d1303dd1 LZ |
260 | /* |
261 | * regex_match_foo - Basic regex callbacks | |
262 | * | |
263 | * @str: the string to be searched | |
264 | * @r: the regex structure containing the pattern string | |
265 | * @len: the length of the string to be searched (including '\0') | |
266 | * | |
267 | * Note: | |
268 | * - @str might not be NULL-terminated if it's of type DYN_STRING | |
269 | * or STATIC_STRING | |
270 | */ | |
271 | ||
1889d209 FW |
272 | static int regex_match_full(char *str, struct regex *r, int len) |
273 | { | |
274 | if (strncmp(str, r->pattern, len) == 0) | |
275 | return 1; | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static int regex_match_front(char *str, struct regex *r, int len) | |
280 | { | |
285caad4 | 281 | if (strncmp(str, r->pattern, r->len) == 0) |
1889d209 FW |
282 | return 1; |
283 | return 0; | |
284 | } | |
285 | ||
286 | static int regex_match_middle(char *str, struct regex *r, int len) | |
287 | { | |
b2af211f | 288 | if (strnstr(str, r->pattern, len)) |
1889d209 FW |
289 | return 1; |
290 | return 0; | |
291 | } | |
292 | ||
293 | static int regex_match_end(char *str, struct regex *r, int len) | |
294 | { | |
a3291c14 | 295 | int strlen = len - 1; |
1889d209 | 296 | |
a3291c14 LZ |
297 | if (strlen >= r->len && |
298 | memcmp(str + strlen - r->len, r->pattern, r->len) == 0) | |
1889d209 FW |
299 | return 1; |
300 | return 0; | |
301 | } | |
302 | ||
3f6fe06d FW |
303 | /** |
304 | * filter_parse_regex - parse a basic regex | |
305 | * @buff: the raw regex | |
306 | * @len: length of the regex | |
307 | * @search: will point to the beginning of the string to compare | |
308 | * @not: tell whether the match will have to be inverted | |
309 | * | |
310 | * This passes in a buffer containing a regex and this function will | |
1889d209 FW |
311 | * set search to point to the search part of the buffer and |
312 | * return the type of search it is (see enum above). | |
313 | * This does modify buff. | |
314 | * | |
315 | * Returns enum type. | |
316 | * search returns the pointer to use for comparison. | |
317 | * not returns 1 if buff started with a '!' | |
318 | * 0 otherwise. | |
319 | */ | |
3f6fe06d | 320 | enum regex_type filter_parse_regex(char *buff, int len, char **search, int *not) |
1889d209 FW |
321 | { |
322 | int type = MATCH_FULL; | |
323 | int i; | |
324 | ||
325 | if (buff[0] == '!') { | |
326 | *not = 1; | |
327 | buff++; | |
328 | len--; | |
329 | } else | |
330 | *not = 0; | |
331 | ||
332 | *search = buff; | |
333 | ||
334 | for (i = 0; i < len; i++) { | |
335 | if (buff[i] == '*') { | |
336 | if (!i) { | |
337 | *search = buff + 1; | |
338 | type = MATCH_END_ONLY; | |
339 | } else { | |
340 | if (type == MATCH_END_ONLY) | |
341 | type = MATCH_MIDDLE_ONLY; | |
342 | else | |
343 | type = MATCH_FRONT_ONLY; | |
344 | buff[i] = 0; | |
345 | break; | |
346 | } | |
347 | } | |
348 | } | |
349 | ||
350 | return type; | |
351 | } | |
352 | ||
b0f1a59a | 353 | static void filter_build_regex(struct filter_pred *pred) |
1889d209 FW |
354 | { |
355 | struct regex *r = &pred->regex; | |
b0f1a59a LZ |
356 | char *search; |
357 | enum regex_type type = MATCH_FULL; | |
358 | int not = 0; | |
359 | ||
360 | if (pred->op == OP_GLOB) { | |
361 | type = filter_parse_regex(r->pattern, r->len, &search, ¬); | |
362 | r->len = strlen(search); | |
363 | memmove(r->pattern, search, r->len+1); | |
364 | } | |
1889d209 FW |
365 | |
366 | switch (type) { | |
367 | case MATCH_FULL: | |
368 | r->match = regex_match_full; | |
369 | break; | |
370 | case MATCH_FRONT_ONLY: | |
371 | r->match = regex_match_front; | |
372 | break; | |
373 | case MATCH_MIDDLE_ONLY: | |
374 | r->match = regex_match_middle; | |
375 | break; | |
376 | case MATCH_END_ONLY: | |
377 | r->match = regex_match_end; | |
378 | break; | |
379 | } | |
380 | ||
381 | pred->not ^= not; | |
1889d209 FW |
382 | } |
383 | ||
61e9dea2 SR |
384 | enum move_type { |
385 | MOVE_DOWN, | |
386 | MOVE_UP_FROM_LEFT, | |
387 | MOVE_UP_FROM_RIGHT | |
388 | }; | |
389 | ||
390 | static struct filter_pred * | |
391 | get_pred_parent(struct filter_pred *pred, struct filter_pred *preds, | |
392 | int index, enum move_type *move) | |
393 | { | |
394 | if (pred->parent & FILTER_PRED_IS_RIGHT) | |
395 | *move = MOVE_UP_FROM_RIGHT; | |
396 | else | |
397 | *move = MOVE_UP_FROM_LEFT; | |
398 | pred = &preds[pred->parent & ~FILTER_PRED_IS_RIGHT]; | |
399 | ||
400 | return pred; | |
401 | } | |
402 | ||
f03f5979 JO |
403 | enum walk_return { |
404 | WALK_PRED_ABORT, | |
405 | WALK_PRED_PARENT, | |
406 | WALK_PRED_DEFAULT, | |
407 | }; | |
408 | ||
409 | typedef int (*filter_pred_walkcb_t) (enum move_type move, | |
410 | struct filter_pred *pred, | |
411 | int *err, void *data); | |
412 | ||
413 | static int walk_pred_tree(struct filter_pred *preds, | |
414 | struct filter_pred *root, | |
415 | filter_pred_walkcb_t cb, void *data) | |
416 | { | |
417 | struct filter_pred *pred = root; | |
418 | enum move_type move = MOVE_DOWN; | |
419 | int done = 0; | |
420 | ||
421 | if (!preds) | |
422 | return -EINVAL; | |
423 | ||
424 | do { | |
425 | int err = 0, ret; | |
426 | ||
427 | ret = cb(move, pred, &err, data); | |
428 | if (ret == WALK_PRED_ABORT) | |
429 | return err; | |
430 | if (ret == WALK_PRED_PARENT) | |
431 | goto get_parent; | |
432 | ||
433 | switch (move) { | |
434 | case MOVE_DOWN: | |
435 | if (pred->left != FILTER_PRED_INVALID) { | |
436 | pred = &preds[pred->left]; | |
437 | continue; | |
438 | } | |
439 | goto get_parent; | |
440 | case MOVE_UP_FROM_LEFT: | |
441 | pred = &preds[pred->right]; | |
442 | move = MOVE_DOWN; | |
443 | continue; | |
444 | case MOVE_UP_FROM_RIGHT: | |
445 | get_parent: | |
446 | if (pred == root) | |
447 | break; | |
448 | pred = get_pred_parent(pred, preds, | |
449 | pred->parent, | |
450 | &move); | |
451 | continue; | |
452 | } | |
453 | done = 1; | |
454 | } while (!done); | |
455 | ||
456 | /* We are fine. */ | |
457 | return 0; | |
458 | } | |
459 | ||
43cd4145 SR |
460 | /* |
461 | * A series of AND or ORs where found together. Instead of | |
462 | * climbing up and down the tree branches, an array of the | |
463 | * ops were made in order of checks. We can just move across | |
464 | * the array and short circuit if needed. | |
465 | */ | |
466 | static int process_ops(struct filter_pred *preds, | |
467 | struct filter_pred *op, void *rec) | |
468 | { | |
469 | struct filter_pred *pred; | |
1ef1d1c2 | 470 | int match = 0; |
43cd4145 | 471 | int type; |
43cd4145 SR |
472 | int i; |
473 | ||
474 | /* | |
475 | * Micro-optimization: We set type to true if op | |
476 | * is an OR and false otherwise (AND). Then we | |
477 | * just need to test if the match is equal to | |
478 | * the type, and if it is, we can short circuit the | |
479 | * rest of the checks: | |
480 | * | |
481 | * if ((match && op->op == OP_OR) || | |
482 | * (!match && op->op == OP_AND)) | |
483 | * return match; | |
484 | */ | |
485 | type = op->op == OP_OR; | |
486 | ||
487 | for (i = 0; i < op->val; i++) { | |
488 | pred = &preds[op->ops[i]]; | |
f30120fc JO |
489 | if (!WARN_ON_ONCE(!pred->fn)) |
490 | match = pred->fn(pred, rec); | |
43cd4145 | 491 | if (!!match == type) |
eabb8980 | 492 | break; |
43cd4145 | 493 | } |
eabb8980 SRRH |
494 | /* If not of not match is equal to not of not, then it is a match */ |
495 | return !!match == !op->not; | |
43cd4145 SR |
496 | } |
497 | ||
f30120fc JO |
498 | struct filter_match_preds_data { |
499 | struct filter_pred *preds; | |
500 | int match; | |
501 | void *rec; | |
502 | }; | |
503 | ||
504 | static int filter_match_preds_cb(enum move_type move, struct filter_pred *pred, | |
505 | int *err, void *data) | |
506 | { | |
507 | struct filter_match_preds_data *d = data; | |
508 | ||
509 | *err = 0; | |
510 | switch (move) { | |
511 | case MOVE_DOWN: | |
512 | /* only AND and OR have children */ | |
513 | if (pred->left != FILTER_PRED_INVALID) { | |
514 | /* If ops is set, then it was folded. */ | |
515 | if (!pred->ops) | |
516 | return WALK_PRED_DEFAULT; | |
517 | /* We can treat folded ops as a leaf node */ | |
518 | d->match = process_ops(d->preds, pred, d->rec); | |
519 | } else { | |
520 | if (!WARN_ON_ONCE(!pred->fn)) | |
521 | d->match = pred->fn(pred, d->rec); | |
522 | } | |
523 | ||
524 | return WALK_PRED_PARENT; | |
525 | case MOVE_UP_FROM_LEFT: | |
526 | /* | |
527 | * Check for short circuits. | |
528 | * | |
529 | * Optimization: !!match == (pred->op == OP_OR) | |
530 | * is the same as: | |
531 | * if ((match && pred->op == OP_OR) || | |
532 | * (!match && pred->op == OP_AND)) | |
533 | */ | |
534 | if (!!d->match == (pred->op == OP_OR)) | |
535 | return WALK_PRED_PARENT; | |
536 | break; | |
537 | case MOVE_UP_FROM_RIGHT: | |
538 | break; | |
539 | } | |
540 | ||
541 | return WALK_PRED_DEFAULT; | |
542 | } | |
543 | ||
7ce7e424 | 544 | /* return 1 if event matches, 0 otherwise (discard) */ |
6fb2915d | 545 | int filter_match_preds(struct event_filter *filter, void *rec) |
7ce7e424 | 546 | { |
74e9e58c | 547 | struct filter_pred *preds; |
61e9dea2 | 548 | struct filter_pred *root; |
f30120fc JO |
549 | struct filter_match_preds_data data = { |
550 | /* match is currently meaningless */ | |
551 | .match = -1, | |
552 | .rec = rec, | |
553 | }; | |
554 | int n_preds, ret; | |
7ce7e424 | 555 | |
6d54057d | 556 | /* no filter is considered a match */ |
75b8e982 SR |
557 | if (!filter) |
558 | return 1; | |
559 | ||
560 | n_preds = filter->n_preds; | |
6d54057d SR |
561 | if (!n_preds) |
562 | return 1; | |
563 | ||
c9c53ca0 | 564 | /* |
61e9dea2 | 565 | * n_preds, root and filter->preds are protect with preemption disabled. |
c9c53ca0 | 566 | */ |
61e9dea2 SR |
567 | root = rcu_dereference_sched(filter->root); |
568 | if (!root) | |
569 | return 1; | |
c9c53ca0 | 570 | |
f30120fc JO |
571 | data.preds = preds = rcu_dereference_sched(filter->preds); |
572 | ret = walk_pred_tree(preds, root, filter_match_preds_cb, &data); | |
573 | WARN_ON(ret); | |
574 | return data.match; | |
7ce7e424 | 575 | } |
17c873ec | 576 | EXPORT_SYMBOL_GPL(filter_match_preds); |
7ce7e424 | 577 | |
8b372562 | 578 | static void parse_error(struct filter_parse_state *ps, int err, int pos) |
7ce7e424 | 579 | { |
8b372562 TZ |
580 | ps->lasterr = err; |
581 | ps->lasterr_pos = pos; | |
582 | } | |
7ce7e424 | 583 | |
8b372562 TZ |
584 | static void remove_filter_string(struct event_filter *filter) |
585 | { | |
75b8e982 SR |
586 | if (!filter) |
587 | return; | |
588 | ||
8b372562 TZ |
589 | kfree(filter->filter_string); |
590 | filter->filter_string = NULL; | |
591 | } | |
592 | ||
593 | static int replace_filter_string(struct event_filter *filter, | |
594 | char *filter_string) | |
595 | { | |
596 | kfree(filter->filter_string); | |
597 | filter->filter_string = kstrdup(filter_string, GFP_KERNEL); | |
598 | if (!filter->filter_string) | |
599 | return -ENOMEM; | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | static int append_filter_string(struct event_filter *filter, | |
605 | char *string) | |
606 | { | |
607 | int newlen; | |
608 | char *new_filter_string; | |
609 | ||
610 | BUG_ON(!filter->filter_string); | |
611 | newlen = strlen(filter->filter_string) + strlen(string) + 1; | |
612 | new_filter_string = kmalloc(newlen, GFP_KERNEL); | |
613 | if (!new_filter_string) | |
614 | return -ENOMEM; | |
615 | ||
616 | strcpy(new_filter_string, filter->filter_string); | |
617 | strcat(new_filter_string, string); | |
618 | kfree(filter->filter_string); | |
619 | filter->filter_string = new_filter_string; | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | static void append_filter_err(struct filter_parse_state *ps, | |
625 | struct event_filter *filter) | |
626 | { | |
627 | int pos = ps->lasterr_pos; | |
628 | char *buf, *pbuf; | |
629 | ||
630 | buf = (char *)__get_free_page(GFP_TEMPORARY); | |
631 | if (!buf) | |
4bda2d51 | 632 | return; |
7ce7e424 | 633 | |
8b372562 TZ |
634 | append_filter_string(filter, "\n"); |
635 | memset(buf, ' ', PAGE_SIZE); | |
636 | if (pos > PAGE_SIZE - 128) | |
637 | pos = 0; | |
638 | buf[pos] = '^'; | |
639 | pbuf = &buf[pos] + 1; | |
640 | ||
641 | sprintf(pbuf, "\nparse_error: %s\n", err_text[ps->lasterr]); | |
642 | append_filter_string(filter, buf); | |
643 | free_page((unsigned long) buf); | |
7ce7e424 TZ |
644 | } |
645 | ||
7f1d2f82 | 646 | static inline struct event_filter *event_filter(struct trace_event_file *file) |
f306cc82 TZ |
647 | { |
648 | if (file->event_call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
649 | return file->event_call->filter; | |
650 | else | |
651 | return file->filter; | |
652 | } | |
653 | ||
e2912b09 | 654 | /* caller must hold event_mutex */ |
7f1d2f82 | 655 | void print_event_filter(struct trace_event_file *file, struct trace_seq *s) |
ac1adc55 | 656 | { |
f306cc82 | 657 | struct event_filter *filter = event_filter(file); |
8b372562 | 658 | |
8e254c1d | 659 | if (filter && filter->filter_string) |
8b372562 TZ |
660 | trace_seq_printf(s, "%s\n", filter->filter_string); |
661 | else | |
146c3442 | 662 | trace_seq_puts(s, "none\n"); |
ac1adc55 TZ |
663 | } |
664 | ||
8b372562 | 665 | void print_subsystem_event_filter(struct event_subsystem *system, |
ac1adc55 TZ |
666 | struct trace_seq *s) |
667 | { | |
75b8e982 | 668 | struct event_filter *filter; |
8b372562 | 669 | |
00e95830 | 670 | mutex_lock(&event_mutex); |
75b8e982 | 671 | filter = system->filter; |
8e254c1d | 672 | if (filter && filter->filter_string) |
8b372562 TZ |
673 | trace_seq_printf(s, "%s\n", filter->filter_string); |
674 | else | |
146c3442 | 675 | trace_seq_puts(s, DEFAULT_SYS_FILTER_MESSAGE "\n"); |
00e95830 | 676 | mutex_unlock(&event_mutex); |
ac1adc55 TZ |
677 | } |
678 | ||
61e9dea2 SR |
679 | static int __alloc_pred_stack(struct pred_stack *stack, int n_preds) |
680 | { | |
47b0edcb | 681 | stack->preds = kcalloc(n_preds + 1, sizeof(*stack->preds), GFP_KERNEL); |
61e9dea2 SR |
682 | if (!stack->preds) |
683 | return -ENOMEM; | |
684 | stack->index = n_preds; | |
685 | return 0; | |
686 | } | |
687 | ||
688 | static void __free_pred_stack(struct pred_stack *stack) | |
689 | { | |
690 | kfree(stack->preds); | |
691 | stack->index = 0; | |
692 | } | |
693 | ||
694 | static int __push_pred_stack(struct pred_stack *stack, | |
695 | struct filter_pred *pred) | |
696 | { | |
697 | int index = stack->index; | |
698 | ||
699 | if (WARN_ON(index == 0)) | |
700 | return -ENOSPC; | |
701 | ||
702 | stack->preds[--index] = pred; | |
703 | stack->index = index; | |
704 | return 0; | |
705 | } | |
706 | ||
707 | static struct filter_pred * | |
708 | __pop_pred_stack(struct pred_stack *stack) | |
709 | { | |
710 | struct filter_pred *pred; | |
711 | int index = stack->index; | |
712 | ||
713 | pred = stack->preds[index++]; | |
714 | if (!pred) | |
715 | return NULL; | |
716 | ||
717 | stack->index = index; | |
718 | return pred; | |
719 | } | |
720 | ||
721 | static int filter_set_pred(struct event_filter *filter, | |
722 | int idx, | |
723 | struct pred_stack *stack, | |
9d96cd17 | 724 | struct filter_pred *src) |
0a19e53c | 725 | { |
61e9dea2 SR |
726 | struct filter_pred *dest = &filter->preds[idx]; |
727 | struct filter_pred *left; | |
728 | struct filter_pred *right; | |
729 | ||
0a19e53c | 730 | *dest = *src; |
61e9dea2 | 731 | dest->index = idx; |
0a19e53c | 732 | |
61e9dea2 SR |
733 | if (dest->op == OP_OR || dest->op == OP_AND) { |
734 | right = __pop_pred_stack(stack); | |
735 | left = __pop_pred_stack(stack); | |
736 | if (!left || !right) | |
737 | return -EINVAL; | |
43cd4145 SR |
738 | /* |
739 | * If both children can be folded | |
740 | * and they are the same op as this op or a leaf, | |
741 | * then this op can be folded. | |
742 | */ | |
743 | if (left->index & FILTER_PRED_FOLD && | |
eabb8980 | 744 | ((left->op == dest->op && !left->not) || |
43cd4145 SR |
745 | left->left == FILTER_PRED_INVALID) && |
746 | right->index & FILTER_PRED_FOLD && | |
eabb8980 | 747 | ((right->op == dest->op && !right->not) || |
43cd4145 SR |
748 | right->left == FILTER_PRED_INVALID)) |
749 | dest->index |= FILTER_PRED_FOLD; | |
750 | ||
751 | dest->left = left->index & ~FILTER_PRED_FOLD; | |
752 | dest->right = right->index & ~FILTER_PRED_FOLD; | |
753 | left->parent = dest->index & ~FILTER_PRED_FOLD; | |
61e9dea2 | 754 | right->parent = dest->index | FILTER_PRED_IS_RIGHT; |
43cd4145 | 755 | } else { |
61e9dea2 SR |
756 | /* |
757 | * Make dest->left invalid to be used as a quick | |
758 | * way to know this is a leaf node. | |
759 | */ | |
760 | dest->left = FILTER_PRED_INVALID; | |
761 | ||
43cd4145 SR |
762 | /* All leafs allow folding the parent ops. */ |
763 | dest->index |= FILTER_PRED_FOLD; | |
764 | } | |
765 | ||
61e9dea2 | 766 | return __push_pred_stack(stack, dest); |
0a19e53c TZ |
767 | } |
768 | ||
c9c53ca0 SR |
769 | static void __free_preds(struct event_filter *filter) |
770 | { | |
60705c89 SRRH |
771 | int i; |
772 | ||
c9c53ca0 | 773 | if (filter->preds) { |
60705c89 SRRH |
774 | for (i = 0; i < filter->n_preds; i++) |
775 | kfree(filter->preds[i].ops); | |
c9c53ca0 SR |
776 | kfree(filter->preds); |
777 | filter->preds = NULL; | |
778 | } | |
779 | filter->a_preds = 0; | |
780 | filter->n_preds = 0; | |
781 | } | |
782 | ||
7f1d2f82 | 783 | static void filter_disable(struct trace_event_file *file) |
f306cc82 | 784 | { |
2425bcb9 | 785 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
786 | |
787 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
b5d09db5 | 788 | call->flags &= ~TRACE_EVENT_FL_FILTERED; |
f306cc82 TZ |
789 | else |
790 | file->flags &= ~FTRACE_EVENT_FL_FILTERED; | |
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 | ||
bac5fb97 TZ |
803 | void free_event_filter(struct event_filter *filter) |
804 | { | |
805 | __free_filter(filter); | |
806 | } | |
807 | ||
c9c53ca0 | 808 | static struct event_filter *__alloc_filter(void) |
0a19e53c | 809 | { |
30e673b2 | 810 | struct event_filter *filter; |
0a19e53c | 811 | |
6fb2915d | 812 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); |
c9c53ca0 SR |
813 | return filter; |
814 | } | |
815 | ||
816 | static int __alloc_preds(struct event_filter *filter, int n_preds) | |
817 | { | |
818 | struct filter_pred *pred; | |
819 | int i; | |
820 | ||
4defe682 SR |
821 | if (filter->preds) |
822 | __free_preds(filter); | |
823 | ||
47b0edcb | 824 | filter->preds = kcalloc(n_preds, sizeof(*filter->preds), GFP_KERNEL); |
c9c53ca0 | 825 | |
30e673b2 | 826 | if (!filter->preds) |
c9c53ca0 SR |
827 | return -ENOMEM; |
828 | ||
4defe682 SR |
829 | filter->a_preds = n_preds; |
830 | filter->n_preds = 0; | |
30e673b2 | 831 | |
c9c53ca0 | 832 | for (i = 0; i < n_preds; i++) { |
74e9e58c | 833 | pred = &filter->preds[i]; |
0a19e53c | 834 | pred->fn = filter_pred_none; |
0a19e53c TZ |
835 | } |
836 | ||
c9c53ca0 | 837 | return 0; |
6fb2915d LZ |
838 | } |
839 | ||
7f1d2f82 | 840 | static inline void __remove_filter(struct trace_event_file *file) |
8e254c1d | 841 | { |
2425bcb9 | 842 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
843 | |
844 | filter_disable(file); | |
845 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
846 | remove_filter_string(call->filter); | |
847 | else | |
848 | remove_filter_string(file->filter); | |
849 | } | |
850 | ||
7967b3e0 | 851 | static void filter_free_subsystem_preds(struct trace_subsystem_dir *dir, |
f306cc82 TZ |
852 | struct trace_array *tr) |
853 | { | |
7f1d2f82 | 854 | struct trace_event_file *file; |
8e254c1d | 855 | |
f306cc82 | 856 | list_for_each_entry(file, &tr->events, list) { |
bb9ef1cb | 857 | if (file->system != dir) |
8e254c1d | 858 | continue; |
f306cc82 | 859 | __remove_filter(file); |
8e254c1d | 860 | } |
8e254c1d | 861 | } |
7ce7e424 | 862 | |
7f1d2f82 | 863 | static inline void __free_subsystem_filter(struct trace_event_file *file) |
cfb180f3 | 864 | { |
2425bcb9 | 865 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
866 | |
867 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) { | |
868 | __free_filter(call->filter); | |
869 | call->filter = NULL; | |
870 | } else { | |
871 | __free_filter(file->filter); | |
872 | file->filter = NULL; | |
873 | } | |
874 | } | |
875 | ||
7967b3e0 | 876 | static void filter_free_subsystem_filters(struct trace_subsystem_dir *dir, |
f306cc82 TZ |
877 | struct trace_array *tr) |
878 | { | |
7f1d2f82 | 879 | struct trace_event_file *file; |
cfb180f3 | 880 | |
f306cc82 | 881 | list_for_each_entry(file, &tr->events, list) { |
bb9ef1cb | 882 | if (file->system != dir) |
8e254c1d | 883 | continue; |
f306cc82 | 884 | __free_subsystem_filter(file); |
cfb180f3 TZ |
885 | } |
886 | } | |
887 | ||
9d96cd17 JO |
888 | static int filter_add_pred(struct filter_parse_state *ps, |
889 | struct event_filter *filter, | |
890 | struct filter_pred *pred, | |
891 | struct pred_stack *stack) | |
7ce7e424 | 892 | { |
61aaef55 | 893 | int err; |
7ce7e424 | 894 | |
c9c53ca0 | 895 | if (WARN_ON(filter->n_preds == filter->a_preds)) { |
8b372562 | 896 | parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0); |
0a19e53c | 897 | return -ENOSPC; |
8b372562 | 898 | } |
7ce7e424 | 899 | |
61aaef55 | 900 | err = filter_set_pred(filter, filter->n_preds, stack, pred); |
0a19e53c TZ |
901 | if (err) |
902 | return err; | |
903 | ||
30e673b2 | 904 | filter->n_preds++; |
7ce7e424 | 905 | |
0a19e53c | 906 | return 0; |
7ce7e424 TZ |
907 | } |
908 | ||
aa38e9fc | 909 | int filter_assign_type(const char *type) |
7ce7e424 | 910 | { |
7fcb7c47 LZ |
911 | if (strstr(type, "__data_loc") && strstr(type, "char")) |
912 | return FILTER_DYN_STRING; | |
913 | ||
7ce7e424 | 914 | if (strchr(type, '[') && strstr(type, "char")) |
e8808c10 FW |
915 | return FILTER_STATIC_STRING; |
916 | ||
aa38e9fc LZ |
917 | return FILTER_OTHER; |
918 | } | |
919 | ||
02aa3162 JO |
920 | static bool is_function_field(struct ftrace_event_field *field) |
921 | { | |
922 | return field->filter_type == FILTER_TRACE_FN; | |
923 | } | |
924 | ||
aa38e9fc LZ |
925 | static bool is_string_field(struct ftrace_event_field *field) |
926 | { | |
927 | return field->filter_type == FILTER_DYN_STRING || | |
87a342f5 LZ |
928 | field->filter_type == FILTER_STATIC_STRING || |
929 | field->filter_type == FILTER_PTR_STRING; | |
7ce7e424 TZ |
930 | } |
931 | ||
8b372562 TZ |
932 | static int is_legal_op(struct ftrace_event_field *field, int op) |
933 | { | |
b0f1a59a LZ |
934 | if (is_string_field(field) && |
935 | (op != OP_EQ && op != OP_NE && op != OP_GLOB)) | |
936 | return 0; | |
937 | if (!is_string_field(field) && op == OP_GLOB) | |
8b372562 TZ |
938 | return 0; |
939 | ||
940 | return 1; | |
941 | } | |
942 | ||
943 | static filter_pred_fn_t select_comparison_fn(int op, int field_size, | |
944 | int field_is_signed) | |
945 | { | |
946 | filter_pred_fn_t fn = NULL; | |
947 | ||
948 | switch (field_size) { | |
949 | case 8: | |
950 | if (op == OP_EQ || op == OP_NE) | |
951 | fn = filter_pred_64; | |
952 | else if (field_is_signed) | |
953 | fn = filter_pred_s64; | |
954 | else | |
955 | fn = filter_pred_u64; | |
956 | break; | |
957 | case 4: | |
958 | if (op == OP_EQ || op == OP_NE) | |
959 | fn = filter_pred_32; | |
960 | else if (field_is_signed) | |
961 | fn = filter_pred_s32; | |
962 | else | |
963 | fn = filter_pred_u32; | |
964 | break; | |
965 | case 2: | |
966 | if (op == OP_EQ || op == OP_NE) | |
967 | fn = filter_pred_16; | |
968 | else if (field_is_signed) | |
969 | fn = filter_pred_s16; | |
970 | else | |
971 | fn = filter_pred_u16; | |
972 | break; | |
973 | case 1: | |
974 | if (op == OP_EQ || op == OP_NE) | |
975 | fn = filter_pred_8; | |
976 | else if (field_is_signed) | |
977 | fn = filter_pred_s8; | |
978 | else | |
979 | fn = filter_pred_u8; | |
980 | break; | |
981 | } | |
982 | ||
983 | return fn; | |
984 | } | |
985 | ||
9d96cd17 | 986 | static int init_pred(struct filter_parse_state *ps, |
61aaef55 | 987 | struct ftrace_event_field *field, |
9d96cd17 JO |
988 | struct filter_pred *pred) |
989 | ||
7ce7e424 | 990 | { |
9d96cd17 | 991 | filter_pred_fn_t fn = filter_pred_none; |
f66578a7 | 992 | unsigned long long val; |
5e4904cb | 993 | int ret; |
7ce7e424 | 994 | |
7ce7e424 TZ |
995 | pred->offset = field->offset; |
996 | ||
8b372562 TZ |
997 | if (!is_legal_op(field, pred->op)) { |
998 | parse_error(ps, FILT_ERR_ILLEGAL_FIELD_OP, 0); | |
999 | return -EINVAL; | |
1000 | } | |
1001 | ||
aa38e9fc | 1002 | if (is_string_field(field)) { |
b0f1a59a | 1003 | filter_build_regex(pred); |
87a342f5 | 1004 | |
1889d209 | 1005 | if (field->filter_type == FILTER_STATIC_STRING) { |
e8808c10 | 1006 | fn = filter_pred_string; |
1889d209 FW |
1007 | pred->regex.field_len = field->size; |
1008 | } else if (field->filter_type == FILTER_DYN_STRING) | |
b0f1a59a | 1009 | fn = filter_pred_strloc; |
16da27a8 | 1010 | else |
87a342f5 | 1011 | fn = filter_pred_pchar; |
5500fa51 JO |
1012 | } else if (is_function_field(field)) { |
1013 | if (strcmp(field->name, "ip")) { | |
1014 | parse_error(ps, FILT_ERR_IP_FIELD_ONLY, 0); | |
1015 | return -EINVAL; | |
1016 | } | |
1017 | } else { | |
5e4904cb | 1018 | if (field->is_signed) |
bcd83ea6 | 1019 | ret = kstrtoll(pred->regex.pattern, 0, &val); |
5e4904cb | 1020 | else |
bcd83ea6 | 1021 | ret = kstrtoull(pred->regex.pattern, 0, &val); |
5e4904cb | 1022 | if (ret) { |
8b372562 | 1023 | parse_error(ps, FILT_ERR_ILLEGAL_INTVAL, 0); |
9f58a159 | 1024 | return -EINVAL; |
8b372562 | 1025 | } |
f66578a7 | 1026 | pred->val = val; |
7ce7e424 | 1027 | |
1f9963cb LZ |
1028 | fn = select_comparison_fn(pred->op, field->size, |
1029 | field->is_signed); | |
1030 | if (!fn) { | |
1031 | parse_error(ps, FILT_ERR_INVALID_OP, 0); | |
1032 | return -EINVAL; | |
1033 | } | |
7ce7e424 TZ |
1034 | } |
1035 | ||
8b372562 | 1036 | if (pred->op == OP_NE) |
e12c09cf | 1037 | pred->not ^= 1; |
ac1adc55 | 1038 | |
9d96cd17 | 1039 | pred->fn = fn; |
1f9963cb | 1040 | return 0; |
cfb180f3 TZ |
1041 | } |
1042 | ||
8b372562 TZ |
1043 | static void parse_init(struct filter_parse_state *ps, |
1044 | struct filter_op *ops, | |
1045 | char *infix_string) | |
1046 | { | |
1047 | memset(ps, '\0', sizeof(*ps)); | |
1048 | ||
1049 | ps->infix.string = infix_string; | |
1050 | ps->infix.cnt = strlen(infix_string); | |
1051 | ps->ops = ops; | |
1052 | ||
1053 | INIT_LIST_HEAD(&ps->opstack); | |
1054 | INIT_LIST_HEAD(&ps->postfix); | |
1055 | } | |
1056 | ||
1057 | static char infix_next(struct filter_parse_state *ps) | |
1058 | { | |
1059 | ps->infix.cnt--; | |
1060 | ||
1061 | return ps->infix.string[ps->infix.tail++]; | |
1062 | } | |
1063 | ||
1064 | static char infix_peek(struct filter_parse_state *ps) | |
1065 | { | |
1066 | if (ps->infix.tail == strlen(ps->infix.string)) | |
1067 | return 0; | |
1068 | ||
1069 | return ps->infix.string[ps->infix.tail]; | |
1070 | } | |
1071 | ||
1072 | static void infix_advance(struct filter_parse_state *ps) | |
1073 | { | |
1074 | ps->infix.cnt--; | |
1075 | ps->infix.tail++; | |
1076 | } | |
1077 | ||
1078 | static inline int is_precedence_lower(struct filter_parse_state *ps, | |
1079 | int a, int b) | |
1080 | { | |
1081 | return ps->ops[a].precedence < ps->ops[b].precedence; | |
1082 | } | |
1083 | ||
1084 | static inline int is_op_char(struct filter_parse_state *ps, char c) | |
1085 | { | |
1086 | int i; | |
1087 | ||
1088 | for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) { | |
1089 | if (ps->ops[i].string[0] == c) | |
1090 | return 1; | |
1091 | } | |
c4cff064 | 1092 | |
0a19e53c | 1093 | return 0; |
cfb180f3 TZ |
1094 | } |
1095 | ||
8b372562 TZ |
1096 | static int infix_get_op(struct filter_parse_state *ps, char firstc) |
1097 | { | |
1098 | char nextc = infix_peek(ps); | |
1099 | char opstr[3]; | |
1100 | int i; | |
1101 | ||
1102 | opstr[0] = firstc; | |
1103 | opstr[1] = nextc; | |
1104 | opstr[2] = '\0'; | |
1105 | ||
1106 | for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) { | |
1107 | if (!strcmp(opstr, ps->ops[i].string)) { | |
1108 | infix_advance(ps); | |
1109 | return ps->ops[i].id; | |
7ce7e424 | 1110 | } |
8b372562 TZ |
1111 | } |
1112 | ||
1113 | opstr[1] = '\0'; | |
1114 | ||
1115 | for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) { | |
1116 | if (!strcmp(opstr, ps->ops[i].string)) | |
1117 | return ps->ops[i].id; | |
1118 | } | |
1119 | ||
1120 | return OP_NONE; | |
1121 | } | |
1122 | ||
1123 | static inline void clear_operand_string(struct filter_parse_state *ps) | |
1124 | { | |
1125 | memset(ps->operand.string, '\0', MAX_FILTER_STR_VAL); | |
1126 | ps->operand.tail = 0; | |
1127 | } | |
1128 | ||
1129 | static inline int append_operand_char(struct filter_parse_state *ps, char c) | |
1130 | { | |
5872144f | 1131 | if (ps->operand.tail == MAX_FILTER_STR_VAL - 1) |
8b372562 TZ |
1132 | return -EINVAL; |
1133 | ||
1134 | ps->operand.string[ps->operand.tail++] = c; | |
1135 | ||
1136 | return 0; | |
1137 | } | |
1138 | ||
1139 | static int filter_opstack_push(struct filter_parse_state *ps, int op) | |
1140 | { | |
1141 | struct opstack_op *opstack_op; | |
1142 | ||
1143 | opstack_op = kmalloc(sizeof(*opstack_op), GFP_KERNEL); | |
1144 | if (!opstack_op) | |
1145 | return -ENOMEM; | |
1146 | ||
1147 | opstack_op->op = op; | |
1148 | list_add(&opstack_op->list, &ps->opstack); | |
1149 | ||
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static int filter_opstack_empty(struct filter_parse_state *ps) | |
1154 | { | |
1155 | return list_empty(&ps->opstack); | |
1156 | } | |
1157 | ||
1158 | static int filter_opstack_top(struct filter_parse_state *ps) | |
1159 | { | |
1160 | struct opstack_op *opstack_op; | |
1161 | ||
1162 | if (filter_opstack_empty(ps)) | |
1163 | return OP_NONE; | |
1164 | ||
1165 | opstack_op = list_first_entry(&ps->opstack, struct opstack_op, list); | |
1166 | ||
1167 | return opstack_op->op; | |
1168 | } | |
1169 | ||
1170 | static int filter_opstack_pop(struct filter_parse_state *ps) | |
1171 | { | |
1172 | struct opstack_op *opstack_op; | |
1173 | int op; | |
1174 | ||
1175 | if (filter_opstack_empty(ps)) | |
1176 | return OP_NONE; | |
1177 | ||
1178 | opstack_op = list_first_entry(&ps->opstack, struct opstack_op, list); | |
1179 | op = opstack_op->op; | |
1180 | list_del(&opstack_op->list); | |
1181 | ||
1182 | kfree(opstack_op); | |
1183 | ||
1184 | return op; | |
1185 | } | |
1186 | ||
1187 | static void filter_opstack_clear(struct filter_parse_state *ps) | |
1188 | { | |
1189 | while (!filter_opstack_empty(ps)) | |
1190 | filter_opstack_pop(ps); | |
1191 | } | |
1192 | ||
1193 | static char *curr_operand(struct filter_parse_state *ps) | |
1194 | { | |
1195 | return ps->operand.string; | |
1196 | } | |
1197 | ||
1198 | static int postfix_append_operand(struct filter_parse_state *ps, char *operand) | |
1199 | { | |
1200 | struct postfix_elt *elt; | |
1201 | ||
1202 | elt = kmalloc(sizeof(*elt), GFP_KERNEL); | |
1203 | if (!elt) | |
1204 | return -ENOMEM; | |
1205 | ||
1206 | elt->op = OP_NONE; | |
1207 | elt->operand = kstrdup(operand, GFP_KERNEL); | |
1208 | if (!elt->operand) { | |
1209 | kfree(elt); | |
1210 | return -ENOMEM; | |
1211 | } | |
1212 | ||
1213 | list_add_tail(&elt->list, &ps->postfix); | |
1214 | ||
1215 | return 0; | |
1216 | } | |
1217 | ||
1218 | static int postfix_append_op(struct filter_parse_state *ps, int op) | |
1219 | { | |
1220 | struct postfix_elt *elt; | |
1221 | ||
1222 | elt = kmalloc(sizeof(*elt), GFP_KERNEL); | |
1223 | if (!elt) | |
1224 | return -ENOMEM; | |
1225 | ||
1226 | elt->op = op; | |
1227 | elt->operand = NULL; | |
1228 | ||
1229 | list_add_tail(&elt->list, &ps->postfix); | |
1230 | ||
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | static void postfix_clear(struct filter_parse_state *ps) | |
1235 | { | |
1236 | struct postfix_elt *elt; | |
1237 | ||
1238 | while (!list_empty(&ps->postfix)) { | |
1239 | elt = list_first_entry(&ps->postfix, struct postfix_elt, list); | |
8b372562 | 1240 | list_del(&elt->list); |
8ad80731 LZ |
1241 | kfree(elt->operand); |
1242 | kfree(elt); | |
8b372562 TZ |
1243 | } |
1244 | } | |
1245 | ||
1246 | static int filter_parse(struct filter_parse_state *ps) | |
1247 | { | |
5928c3cc | 1248 | int in_string = 0; |
8b372562 TZ |
1249 | int op, top_op; |
1250 | char ch; | |
1251 | ||
1252 | while ((ch = infix_next(ps))) { | |
5928c3cc FW |
1253 | if (ch == '"') { |
1254 | in_string ^= 1; | |
1255 | continue; | |
1256 | } | |
1257 | ||
1258 | if (in_string) | |
1259 | goto parse_operand; | |
1260 | ||
8b372562 TZ |
1261 | if (isspace(ch)) |
1262 | continue; | |
1263 | ||
1264 | if (is_op_char(ps, ch)) { | |
1265 | op = infix_get_op(ps, ch); | |
1266 | if (op == OP_NONE) { | |
1267 | parse_error(ps, FILT_ERR_INVALID_OP, 0); | |
7ce7e424 TZ |
1268 | return -EINVAL; |
1269 | } | |
8b372562 TZ |
1270 | |
1271 | if (strlen(curr_operand(ps))) { | |
1272 | postfix_append_operand(ps, curr_operand(ps)); | |
1273 | clear_operand_string(ps); | |
1274 | } | |
1275 | ||
1276 | while (!filter_opstack_empty(ps)) { | |
1277 | top_op = filter_opstack_top(ps); | |
1278 | if (!is_precedence_lower(ps, top_op, op)) { | |
1279 | top_op = filter_opstack_pop(ps); | |
1280 | postfix_append_op(ps, top_op); | |
1281 | continue; | |
1282 | } | |
1283 | break; | |
1284 | } | |
1285 | ||
1286 | filter_opstack_push(ps, op); | |
7ce7e424 TZ |
1287 | continue; |
1288 | } | |
8b372562 TZ |
1289 | |
1290 | if (ch == '(') { | |
1291 | filter_opstack_push(ps, OP_OPEN_PAREN); | |
1292 | continue; | |
1293 | } | |
1294 | ||
1295 | if (ch == ')') { | |
1296 | if (strlen(curr_operand(ps))) { | |
1297 | postfix_append_operand(ps, curr_operand(ps)); | |
1298 | clear_operand_string(ps); | |
1299 | } | |
1300 | ||
1301 | top_op = filter_opstack_pop(ps); | |
1302 | while (top_op != OP_NONE) { | |
1303 | if (top_op == OP_OPEN_PAREN) | |
1304 | break; | |
1305 | postfix_append_op(ps, top_op); | |
1306 | top_op = filter_opstack_pop(ps); | |
1307 | } | |
1308 | if (top_op == OP_NONE) { | |
1309 | parse_error(ps, FILT_ERR_UNBALANCED_PAREN, 0); | |
1310 | return -EINVAL; | |
7ce7e424 | 1311 | } |
7ce7e424 TZ |
1312 | continue; |
1313 | } | |
5928c3cc | 1314 | parse_operand: |
8b372562 TZ |
1315 | if (append_operand_char(ps, ch)) { |
1316 | parse_error(ps, FILT_ERR_OPERAND_TOO_LONG, 0); | |
1317 | return -EINVAL; | |
1318 | } | |
1319 | } | |
1320 | ||
1321 | if (strlen(curr_operand(ps))) | |
1322 | postfix_append_operand(ps, curr_operand(ps)); | |
1323 | ||
1324 | while (!filter_opstack_empty(ps)) { | |
1325 | top_op = filter_opstack_pop(ps); | |
1326 | if (top_op == OP_NONE) | |
1327 | break; | |
1328 | if (top_op == OP_OPEN_PAREN) { | |
1329 | parse_error(ps, FILT_ERR_UNBALANCED_PAREN, 0); | |
1330 | return -EINVAL; | |
1331 | } | |
1332 | postfix_append_op(ps, top_op); | |
1333 | } | |
1334 | ||
1335 | return 0; | |
1336 | } | |
1337 | ||
81570d9c | 1338 | static struct filter_pred *create_pred(struct filter_parse_state *ps, |
2425bcb9 | 1339 | struct trace_event_call *call, |
81570d9c | 1340 | int op, char *operand1, char *operand2) |
8b372562 | 1341 | { |
61aaef55 | 1342 | struct ftrace_event_field *field; |
81570d9c | 1343 | static struct filter_pred pred; |
8b372562 | 1344 | |
81570d9c JO |
1345 | memset(&pred, 0, sizeof(pred)); |
1346 | pred.op = op; | |
8b372562 | 1347 | |
81570d9c JO |
1348 | if (op == OP_AND || op == OP_OR) |
1349 | return &pred; | |
1350 | ||
1351 | if (!operand1 || !operand2) { | |
1352 | parse_error(ps, FILT_ERR_MISSING_FIELD, 0); | |
8b372562 TZ |
1353 | return NULL; |
1354 | } | |
1355 | ||
b3a8c6fd | 1356 | field = trace_find_event_field(call, operand1); |
61aaef55 JO |
1357 | if (!field) { |
1358 | parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0); | |
8b372562 | 1359 | return NULL; |
61aaef55 | 1360 | } |
8b372562 | 1361 | |
81570d9c JO |
1362 | strcpy(pred.regex.pattern, operand2); |
1363 | pred.regex.len = strlen(pred.regex.pattern); | |
1d0e78e3 | 1364 | pred.field = field; |
61aaef55 | 1365 | return init_pred(ps, field, &pred) ? NULL : &pred; |
8b372562 TZ |
1366 | } |
1367 | ||
1368 | static int check_preds(struct filter_parse_state *ps) | |
1369 | { | |
1370 | int n_normal_preds = 0, n_logical_preds = 0; | |
1371 | struct postfix_elt *elt; | |
1372 | ||
1373 | list_for_each_entry(elt, &ps->postfix, list) { | |
1374 | if (elt->op == OP_NONE) | |
1375 | continue; | |
1376 | ||
1377 | if (elt->op == OP_AND || elt->op == OP_OR) { | |
1378 | n_logical_preds++; | |
1379 | continue; | |
7ce7e424 | 1380 | } |
8b372562 | 1381 | n_normal_preds++; |
7ce7e424 TZ |
1382 | } |
1383 | ||
8b372562 TZ |
1384 | if (!n_normal_preds || n_logical_preds >= n_normal_preds) { |
1385 | parse_error(ps, FILT_ERR_INVALID_FILTER, 0); | |
bcabd91c LZ |
1386 | return -EINVAL; |
1387 | } | |
1388 | ||
8b372562 TZ |
1389 | return 0; |
1390 | } | |
f66578a7 | 1391 | |
c9c53ca0 SR |
1392 | static int count_preds(struct filter_parse_state *ps) |
1393 | { | |
1394 | struct postfix_elt *elt; | |
1395 | int n_preds = 0; | |
1396 | ||
1397 | list_for_each_entry(elt, &ps->postfix, list) { | |
1398 | if (elt->op == OP_NONE) | |
1399 | continue; | |
1400 | n_preds++; | |
1401 | } | |
1402 | ||
1403 | return n_preds; | |
1404 | } | |
1405 | ||
f03f5979 JO |
1406 | struct check_pred_data { |
1407 | int count; | |
1408 | int max; | |
1409 | }; | |
1410 | ||
1411 | static int check_pred_tree_cb(enum move_type move, struct filter_pred *pred, | |
1412 | int *err, void *data) | |
1413 | { | |
1414 | struct check_pred_data *d = data; | |
1415 | ||
1416 | if (WARN_ON(d->count++ > d->max)) { | |
1417 | *err = -EINVAL; | |
1418 | return WALK_PRED_ABORT; | |
1419 | } | |
1420 | return WALK_PRED_DEFAULT; | |
1421 | } | |
1422 | ||
ec126cac SR |
1423 | /* |
1424 | * The tree is walked at filtering of an event. If the tree is not correctly | |
1425 | * built, it may cause an infinite loop. Check here that the tree does | |
1426 | * indeed terminate. | |
1427 | */ | |
1428 | static int check_pred_tree(struct event_filter *filter, | |
1429 | struct filter_pred *root) | |
1430 | { | |
f03f5979 JO |
1431 | struct check_pred_data data = { |
1432 | /* | |
1433 | * The max that we can hit a node is three times. | |
1434 | * Once going down, once coming up from left, and | |
1435 | * once coming up from right. This is more than enough | |
1436 | * since leafs are only hit a single time. | |
1437 | */ | |
1438 | .max = 3 * filter->n_preds, | |
1439 | .count = 0, | |
1440 | }; | |
ec126cac | 1441 | |
f03f5979 JO |
1442 | return walk_pred_tree(filter->preds, root, |
1443 | check_pred_tree_cb, &data); | |
ec126cac SR |
1444 | } |
1445 | ||
c00b060f JO |
1446 | static int count_leafs_cb(enum move_type move, struct filter_pred *pred, |
1447 | int *err, void *data) | |
43cd4145 | 1448 | { |
c00b060f | 1449 | int *count = data; |
43cd4145 | 1450 | |
c00b060f JO |
1451 | if ((move == MOVE_DOWN) && |
1452 | (pred->left == FILTER_PRED_INVALID)) | |
1453 | (*count)++; | |
43cd4145 | 1454 | |
c00b060f JO |
1455 | return WALK_PRED_DEFAULT; |
1456 | } | |
1457 | ||
1458 | static int count_leafs(struct filter_pred *preds, struct filter_pred *root) | |
1459 | { | |
1460 | int count = 0, ret; | |
43cd4145 | 1461 | |
c00b060f JO |
1462 | ret = walk_pred_tree(preds, root, count_leafs_cb, &count); |
1463 | WARN_ON(ret); | |
43cd4145 SR |
1464 | return count; |
1465 | } | |
1466 | ||
96bc293a JO |
1467 | struct fold_pred_data { |
1468 | struct filter_pred *root; | |
1469 | int count; | |
1470 | int children; | |
1471 | }; | |
1472 | ||
1473 | static int fold_pred_cb(enum move_type move, struct filter_pred *pred, | |
1474 | int *err, void *data) | |
1475 | { | |
1476 | struct fold_pred_data *d = data; | |
1477 | struct filter_pred *root = d->root; | |
1478 | ||
1479 | if (move != MOVE_DOWN) | |
1480 | return WALK_PRED_DEFAULT; | |
1481 | if (pred->left != FILTER_PRED_INVALID) | |
1482 | return WALK_PRED_DEFAULT; | |
1483 | ||
1484 | if (WARN_ON(d->count == d->children)) { | |
1485 | *err = -EINVAL; | |
1486 | return WALK_PRED_ABORT; | |
1487 | } | |
1488 | ||
1489 | pred->index &= ~FILTER_PRED_FOLD; | |
1490 | root->ops[d->count++] = pred->index; | |
1491 | return WALK_PRED_DEFAULT; | |
1492 | } | |
1493 | ||
43cd4145 SR |
1494 | static int fold_pred(struct filter_pred *preds, struct filter_pred *root) |
1495 | { | |
96bc293a JO |
1496 | struct fold_pred_data data = { |
1497 | .root = root, | |
1498 | .count = 0, | |
1499 | }; | |
43cd4145 | 1500 | int children; |
43cd4145 SR |
1501 | |
1502 | /* No need to keep the fold flag */ | |
1503 | root->index &= ~FILTER_PRED_FOLD; | |
1504 | ||
1505 | /* If the root is a leaf then do nothing */ | |
1506 | if (root->left == FILTER_PRED_INVALID) | |
1507 | return 0; | |
1508 | ||
1509 | /* count the children */ | |
1510 | children = count_leafs(preds, &preds[root->left]); | |
1511 | children += count_leafs(preds, &preds[root->right]); | |
1512 | ||
47b0edcb | 1513 | root->ops = kcalloc(children, sizeof(*root->ops), GFP_KERNEL); |
43cd4145 SR |
1514 | if (!root->ops) |
1515 | return -ENOMEM; | |
1516 | ||
1517 | root->val = children; | |
96bc293a JO |
1518 | data.children = children; |
1519 | return walk_pred_tree(preds, root, fold_pred_cb, &data); | |
43cd4145 SR |
1520 | } |
1521 | ||
1b797fe5 JO |
1522 | static int fold_pred_tree_cb(enum move_type move, struct filter_pred *pred, |
1523 | int *err, void *data) | |
1524 | { | |
1525 | struct filter_pred *preds = data; | |
1526 | ||
1527 | if (move != MOVE_DOWN) | |
1528 | return WALK_PRED_DEFAULT; | |
1529 | if (!(pred->index & FILTER_PRED_FOLD)) | |
1530 | return WALK_PRED_DEFAULT; | |
1531 | ||
1532 | *err = fold_pred(preds, pred); | |
1533 | if (*err) | |
1534 | return WALK_PRED_ABORT; | |
1535 | ||
1536 | /* eveyrhing below is folded, continue with parent */ | |
1537 | return WALK_PRED_PARENT; | |
1538 | } | |
1539 | ||
43cd4145 SR |
1540 | /* |
1541 | * To optimize the processing of the ops, if we have several "ors" or | |
1542 | * "ands" together, we can put them in an array and process them all | |
1543 | * together speeding up the filter logic. | |
1544 | */ | |
1545 | static int fold_pred_tree(struct event_filter *filter, | |
1546 | struct filter_pred *root) | |
1547 | { | |
1b797fe5 JO |
1548 | return walk_pred_tree(filter->preds, root, fold_pred_tree_cb, |
1549 | filter->preds); | |
43cd4145 SR |
1550 | } |
1551 | ||
2425bcb9 | 1552 | static int replace_preds(struct trace_event_call *call, |
6fb2915d | 1553 | struct event_filter *filter, |
8b372562 | 1554 | struct filter_parse_state *ps, |
1f9963cb | 1555 | bool dry_run) |
8b372562 TZ |
1556 | { |
1557 | char *operand1 = NULL, *operand2 = NULL; | |
1558 | struct filter_pred *pred; | |
ec126cac | 1559 | struct filter_pred *root; |
8b372562 | 1560 | struct postfix_elt *elt; |
61e9dea2 | 1561 | struct pred_stack stack = { }; /* init to NULL */ |
8b372562 | 1562 | int err; |
1f9963cb | 1563 | int n_preds = 0; |
8b372562 | 1564 | |
c9c53ca0 SR |
1565 | n_preds = count_preds(ps); |
1566 | if (n_preds >= MAX_FILTER_PRED) { | |
1567 | parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0); | |
1568 | return -ENOSPC; | |
1569 | } | |
1570 | ||
8b372562 TZ |
1571 | err = check_preds(ps); |
1572 | if (err) | |
1573 | return err; | |
1574 | ||
c9c53ca0 | 1575 | if (!dry_run) { |
61e9dea2 | 1576 | err = __alloc_pred_stack(&stack, n_preds); |
c9c53ca0 SR |
1577 | if (err) |
1578 | return err; | |
61e9dea2 SR |
1579 | err = __alloc_preds(filter, n_preds); |
1580 | if (err) | |
1581 | goto fail; | |
c9c53ca0 SR |
1582 | } |
1583 | ||
1584 | n_preds = 0; | |
8b372562 TZ |
1585 | list_for_each_entry(elt, &ps->postfix, list) { |
1586 | if (elt->op == OP_NONE) { | |
1587 | if (!operand1) | |
1588 | operand1 = elt->operand; | |
1589 | else if (!operand2) | |
1590 | operand2 = elt->operand; | |
1591 | else { | |
1592 | parse_error(ps, FILT_ERR_TOO_MANY_OPERANDS, 0); | |
61e9dea2 SR |
1593 | err = -EINVAL; |
1594 | goto fail; | |
8b372562 TZ |
1595 | } |
1596 | continue; | |
1597 | } | |
1598 | ||
e12c09cf SRRH |
1599 | if (elt->op == OP_NOT) { |
1600 | if (!n_preds || operand1 || operand2) { | |
1601 | parse_error(ps, FILT_ERR_ILLEGAL_NOT_OP, 0); | |
1602 | err = -EINVAL; | |
1603 | goto fail; | |
1604 | } | |
1605 | if (!dry_run) | |
1606 | filter->preds[n_preds - 1].not ^= 1; | |
1607 | continue; | |
1608 | } | |
1609 | ||
c9c53ca0 | 1610 | if (WARN_ON(n_preds++ == MAX_FILTER_PRED)) { |
1f9963cb | 1611 | parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0); |
61e9dea2 SR |
1612 | err = -ENOSPC; |
1613 | goto fail; | |
1f9963cb LZ |
1614 | } |
1615 | ||
9d96cd17 | 1616 | pred = create_pred(ps, call, elt->op, operand1, operand2); |
61e9dea2 | 1617 | if (!pred) { |
61aaef55 | 1618 | err = -EINVAL; |
61e9dea2 SR |
1619 | goto fail; |
1620 | } | |
61aaef55 | 1621 | |
9d96cd17 JO |
1622 | if (!dry_run) { |
1623 | err = filter_add_pred(ps, filter, pred, &stack); | |
61aaef55 | 1624 | if (err) |
9d96cd17 | 1625 | goto fail; |
9d96cd17 | 1626 | } |
8b372562 TZ |
1627 | |
1628 | operand1 = operand2 = NULL; | |
1629 | } | |
7ce7e424 | 1630 | |
61e9dea2 SR |
1631 | if (!dry_run) { |
1632 | /* We should have one item left on the stack */ | |
1633 | pred = __pop_pred_stack(&stack); | |
1634 | if (!pred) | |
1635 | return -EINVAL; | |
1636 | /* This item is where we start from in matching */ | |
ec126cac | 1637 | root = pred; |
61e9dea2 SR |
1638 | /* Make sure the stack is empty */ |
1639 | pred = __pop_pred_stack(&stack); | |
1640 | if (WARN_ON(pred)) { | |
1641 | err = -EINVAL; | |
1642 | filter->root = NULL; | |
1643 | goto fail; | |
1644 | } | |
ec126cac SR |
1645 | err = check_pred_tree(filter, root); |
1646 | if (err) | |
1647 | goto fail; | |
1648 | ||
43cd4145 SR |
1649 | /* Optimize the tree */ |
1650 | err = fold_pred_tree(filter, root); | |
1651 | if (err) | |
1652 | goto fail; | |
1653 | ||
ec126cac SR |
1654 | /* We don't set root until we know it works */ |
1655 | barrier(); | |
1656 | filter->root = root; | |
61e9dea2 SR |
1657 | } |
1658 | ||
1659 | err = 0; | |
1660 | fail: | |
1661 | __free_pred_stack(&stack); | |
1662 | return err; | |
7ce7e424 TZ |
1663 | } |
1664 | ||
7f1d2f82 | 1665 | static inline void event_set_filtered_flag(struct trace_event_file *file) |
f306cc82 | 1666 | { |
2425bcb9 | 1667 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1668 | |
1669 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
1670 | call->flags |= TRACE_EVENT_FL_FILTERED; | |
1671 | else | |
1672 | file->flags |= FTRACE_EVENT_FL_FILTERED; | |
1673 | } | |
1674 | ||
7f1d2f82 | 1675 | static inline void event_set_filter(struct trace_event_file *file, |
f306cc82 TZ |
1676 | struct event_filter *filter) |
1677 | { | |
2425bcb9 | 1678 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1679 | |
1680 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
1681 | rcu_assign_pointer(call->filter, filter); | |
1682 | else | |
1683 | rcu_assign_pointer(file->filter, filter); | |
1684 | } | |
1685 | ||
7f1d2f82 | 1686 | static inline void event_clear_filter(struct trace_event_file *file) |
f306cc82 | 1687 | { |
2425bcb9 | 1688 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1689 | |
1690 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
1691 | RCU_INIT_POINTER(call->filter, NULL); | |
1692 | else | |
1693 | RCU_INIT_POINTER(file->filter, NULL); | |
1694 | } | |
1695 | ||
1696 | static inline void | |
7f1d2f82 | 1697 | event_set_no_set_filter_flag(struct trace_event_file *file) |
f306cc82 | 1698 | { |
2425bcb9 | 1699 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1700 | |
1701 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
1702 | call->flags |= TRACE_EVENT_FL_NO_SET_FILTER; | |
1703 | else | |
1704 | file->flags |= FTRACE_EVENT_FL_NO_SET_FILTER; | |
1705 | } | |
1706 | ||
1707 | static inline void | |
7f1d2f82 | 1708 | event_clear_no_set_filter_flag(struct trace_event_file *file) |
f306cc82 | 1709 | { |
2425bcb9 | 1710 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1711 | |
1712 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
1713 | call->flags &= ~TRACE_EVENT_FL_NO_SET_FILTER; | |
1714 | else | |
1715 | file->flags &= ~FTRACE_EVENT_FL_NO_SET_FILTER; | |
1716 | } | |
1717 | ||
1718 | static inline bool | |
7f1d2f82 | 1719 | event_no_set_filter_flag(struct trace_event_file *file) |
f306cc82 | 1720 | { |
2425bcb9 | 1721 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1722 | |
1723 | if (file->flags & FTRACE_EVENT_FL_NO_SET_FILTER) | |
1724 | return true; | |
1725 | ||
1726 | if ((call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) && | |
1727 | (call->flags & TRACE_EVENT_FL_NO_SET_FILTER)) | |
1728 | return true; | |
1729 | ||
1730 | return false; | |
1731 | } | |
1732 | ||
75b8e982 SR |
1733 | struct filter_list { |
1734 | struct list_head list; | |
1735 | struct event_filter *filter; | |
1736 | }; | |
1737 | ||
7967b3e0 | 1738 | static int replace_system_preds(struct trace_subsystem_dir *dir, |
f306cc82 | 1739 | struct trace_array *tr, |
fce29d15 LZ |
1740 | struct filter_parse_state *ps, |
1741 | char *filter_string) | |
1742 | { | |
7f1d2f82 | 1743 | struct trace_event_file *file; |
75b8e982 SR |
1744 | struct filter_list *filter_item; |
1745 | struct filter_list *tmp; | |
1746 | LIST_HEAD(filter_list); | |
fce29d15 | 1747 | bool fail = true; |
a66abe7f | 1748 | int err; |
fce29d15 | 1749 | |
f306cc82 | 1750 | list_for_each_entry(file, &tr->events, list) { |
bb9ef1cb | 1751 | if (file->system != dir) |
fce29d15 LZ |
1752 | continue; |
1753 | ||
75b8e982 SR |
1754 | /* |
1755 | * Try to see if the filter can be applied | |
1756 | * (filter arg is ignored on dry_run) | |
1757 | */ | |
6355d544 | 1758 | err = replace_preds(file->event_call, NULL, ps, true); |
fce29d15 | 1759 | if (err) |
f306cc82 | 1760 | event_set_no_set_filter_flag(file); |
ed0449af | 1761 | else |
f306cc82 | 1762 | event_clear_no_set_filter_flag(file); |
0fc3ca9a SR |
1763 | } |
1764 | ||
f306cc82 | 1765 | list_for_each_entry(file, &tr->events, list) { |
75b8e982 | 1766 | struct event_filter *filter; |
0fc3ca9a | 1767 | |
bb9ef1cb | 1768 | if (file->system != dir) |
0fc3ca9a SR |
1769 | continue; |
1770 | ||
f306cc82 | 1771 | if (event_no_set_filter_flag(file)) |
ed0449af LZ |
1772 | continue; |
1773 | ||
75b8e982 SR |
1774 | filter_item = kzalloc(sizeof(*filter_item), GFP_KERNEL); |
1775 | if (!filter_item) | |
1776 | goto fail_mem; | |
0fc3ca9a | 1777 | |
75b8e982 | 1778 | list_add_tail(&filter_item->list, &filter_list); |
0fc3ca9a | 1779 | |
75b8e982 SR |
1780 | filter_item->filter = __alloc_filter(); |
1781 | if (!filter_item->filter) | |
1782 | goto fail_mem; | |
1783 | filter = filter_item->filter; | |
0fc3ca9a | 1784 | |
75b8e982 SR |
1785 | /* Can only fail on no memory */ |
1786 | err = replace_filter_string(filter, filter_string); | |
1787 | if (err) | |
1788 | goto fail_mem; | |
fce29d15 | 1789 | |
6355d544 | 1790 | err = replace_preds(file->event_call, filter, ps, false); |
75b8e982 | 1791 | if (err) { |
f306cc82 | 1792 | filter_disable(file); |
75b8e982 SR |
1793 | parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0); |
1794 | append_filter_err(ps, filter); | |
1795 | } else | |
f306cc82 | 1796 | event_set_filtered_flag(file); |
75b8e982 SR |
1797 | /* |
1798 | * Regardless of if this returned an error, we still | |
1799 | * replace the filter for the call. | |
1800 | */ | |
f306cc82 TZ |
1801 | filter = event_filter(file); |
1802 | event_set_filter(file, filter_item->filter); | |
75b8e982 SR |
1803 | filter_item->filter = filter; |
1804 | ||
fce29d15 LZ |
1805 | fail = false; |
1806 | } | |
1807 | ||
0fc3ca9a SR |
1808 | if (fail) |
1809 | goto fail; | |
1810 | ||
75b8e982 SR |
1811 | /* |
1812 | * The calls can still be using the old filters. | |
1813 | * Do a synchronize_sched() to ensure all calls are | |
1814 | * done with them before we free them. | |
1815 | */ | |
1816 | synchronize_sched(); | |
1817 | list_for_each_entry_safe(filter_item, tmp, &filter_list, list) { | |
1818 | __free_filter(filter_item->filter); | |
1819 | list_del(&filter_item->list); | |
1820 | kfree(filter_item); | |
1821 | } | |
fce29d15 | 1822 | return 0; |
0fc3ca9a | 1823 | fail: |
75b8e982 SR |
1824 | /* No call succeeded */ |
1825 | list_for_each_entry_safe(filter_item, tmp, &filter_list, list) { | |
1826 | list_del(&filter_item->list); | |
1827 | kfree(filter_item); | |
1828 | } | |
0fc3ca9a SR |
1829 | parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0); |
1830 | return -EINVAL; | |
75b8e982 SR |
1831 | fail_mem: |
1832 | /* If any call succeeded, we still need to sync */ | |
1833 | if (!fail) | |
1834 | synchronize_sched(); | |
1835 | list_for_each_entry_safe(filter_item, tmp, &filter_list, list) { | |
1836 | __free_filter(filter_item->filter); | |
1837 | list_del(&filter_item->list); | |
1838 | kfree(filter_item); | |
1839 | } | |
1840 | return -ENOMEM; | |
fce29d15 LZ |
1841 | } |
1842 | ||
38b78eb8 TH |
1843 | static int create_filter_start(char *filter_str, bool set_str, |
1844 | struct filter_parse_state **psp, | |
1845 | struct event_filter **filterp) | |
1846 | { | |
1847 | struct event_filter *filter; | |
1848 | struct filter_parse_state *ps = NULL; | |
1849 | int err = 0; | |
1850 | ||
1851 | WARN_ON_ONCE(*psp || *filterp); | |
1852 | ||
1853 | /* allocate everything, and if any fails, free all and fail */ | |
1854 | filter = __alloc_filter(); | |
1855 | if (filter && set_str) | |
1856 | err = replace_filter_string(filter, filter_str); | |
1857 | ||
1858 | ps = kzalloc(sizeof(*ps), GFP_KERNEL); | |
1859 | ||
1860 | if (!filter || !ps || err) { | |
1861 | kfree(ps); | |
1862 | __free_filter(filter); | |
1863 | return -ENOMEM; | |
1864 | } | |
1865 | ||
1866 | /* we're committed to creating a new filter */ | |
1867 | *filterp = filter; | |
1868 | *psp = ps; | |
1869 | ||
1870 | parse_init(ps, filter_ops, filter_str); | |
1871 | err = filter_parse(ps); | |
1872 | if (err && set_str) | |
1873 | append_filter_err(ps, filter); | |
1874 | return err; | |
1875 | } | |
1876 | ||
1877 | static void create_filter_finish(struct filter_parse_state *ps) | |
1878 | { | |
1879 | if (ps) { | |
1880 | filter_opstack_clear(ps); | |
1881 | postfix_clear(ps); | |
1882 | kfree(ps); | |
1883 | } | |
1884 | } | |
1885 | ||
1886 | /** | |
2425bcb9 SRRH |
1887 | * create_filter - create a filter for a trace_event_call |
1888 | * @call: trace_event_call to create a filter for | |
38b78eb8 TH |
1889 | * @filter_str: filter string |
1890 | * @set_str: remember @filter_str and enable detailed error in filter | |
1891 | * @filterp: out param for created filter (always updated on return) | |
1892 | * | |
1893 | * Creates a filter for @call with @filter_str. If @set_str is %true, | |
1894 | * @filter_str is copied and recorded in the new filter. | |
1895 | * | |
1896 | * On success, returns 0 and *@filterp points to the new filter. On | |
1897 | * failure, returns -errno and *@filterp may point to %NULL or to a new | |
1898 | * filter. In the latter case, the returned filter contains error | |
1899 | * information if @set_str is %true and the caller is responsible for | |
1900 | * freeing it. | |
1901 | */ | |
2425bcb9 | 1902 | static int create_filter(struct trace_event_call *call, |
38b78eb8 TH |
1903 | char *filter_str, bool set_str, |
1904 | struct event_filter **filterp) | |
1905 | { | |
1906 | struct event_filter *filter = NULL; | |
1907 | struct filter_parse_state *ps = NULL; | |
1908 | int err; | |
1909 | ||
1910 | err = create_filter_start(filter_str, set_str, &ps, &filter); | |
1911 | if (!err) { | |
6355d544 | 1912 | err = replace_preds(call, filter, ps, false); |
38b78eb8 TH |
1913 | if (err && set_str) |
1914 | append_filter_err(ps, filter); | |
1915 | } | |
1916 | create_filter_finish(ps); | |
1917 | ||
1918 | *filterp = filter; | |
1919 | return err; | |
1920 | } | |
1921 | ||
2425bcb9 | 1922 | int create_event_filter(struct trace_event_call *call, |
bac5fb97 TZ |
1923 | char *filter_str, bool set_str, |
1924 | struct event_filter **filterp) | |
1925 | { | |
1926 | return create_filter(call, filter_str, set_str, filterp); | |
1927 | } | |
1928 | ||
38b78eb8 TH |
1929 | /** |
1930 | * create_system_filter - create a filter for an event_subsystem | |
1931 | * @system: event_subsystem to create a filter for | |
1932 | * @filter_str: filter string | |
1933 | * @filterp: out param for created filter (always updated on return) | |
1934 | * | |
1935 | * Identical to create_filter() except that it creates a subsystem filter | |
1936 | * and always remembers @filter_str. | |
1937 | */ | |
7967b3e0 | 1938 | static int create_system_filter(struct trace_subsystem_dir *dir, |
f306cc82 | 1939 | struct trace_array *tr, |
38b78eb8 TH |
1940 | char *filter_str, struct event_filter **filterp) |
1941 | { | |
1942 | struct event_filter *filter = NULL; | |
1943 | struct filter_parse_state *ps = NULL; | |
1944 | int err; | |
1945 | ||
1946 | err = create_filter_start(filter_str, true, &ps, &filter); | |
1947 | if (!err) { | |
bb9ef1cb | 1948 | err = replace_system_preds(dir, tr, ps, filter_str); |
38b78eb8 TH |
1949 | if (!err) { |
1950 | /* System filters just show a default message */ | |
1951 | kfree(filter->filter_string); | |
1952 | filter->filter_string = NULL; | |
1953 | } else { | |
1954 | append_filter_err(ps, filter); | |
1955 | } | |
1956 | } | |
1957 | create_filter_finish(ps); | |
1958 | ||
1959 | *filterp = filter; | |
1960 | return err; | |
1961 | } | |
1962 | ||
e2912b09 | 1963 | /* caller must hold event_mutex */ |
7f1d2f82 | 1964 | int apply_event_filter(struct trace_event_file *file, char *filter_string) |
8b372562 | 1965 | { |
2425bcb9 | 1966 | struct trace_event_call *call = file->event_call; |
75b8e982 | 1967 | struct event_filter *filter; |
e2912b09 | 1968 | int err; |
8b372562 TZ |
1969 | |
1970 | if (!strcmp(strstrip(filter_string), "0")) { | |
f306cc82 TZ |
1971 | filter_disable(file); |
1972 | filter = event_filter(file); | |
1973 | ||
75b8e982 | 1974 | if (!filter) |
e2912b09 | 1975 | return 0; |
f306cc82 TZ |
1976 | |
1977 | event_clear_filter(file); | |
1978 | ||
f76690af SR |
1979 | /* Make sure the filter is not being used */ |
1980 | synchronize_sched(); | |
75b8e982 | 1981 | __free_filter(filter); |
f306cc82 | 1982 | |
e2912b09 | 1983 | return 0; |
8b372562 TZ |
1984 | } |
1985 | ||
38b78eb8 | 1986 | err = create_filter(call, filter_string, true, &filter); |
8b372562 | 1987 | |
75b8e982 SR |
1988 | /* |
1989 | * Always swap the call filter with the new filter | |
1990 | * even if there was an error. If there was an error | |
1991 | * in the filter, we disable the filter and show the error | |
1992 | * string | |
1993 | */ | |
38b78eb8 | 1994 | if (filter) { |
f306cc82 | 1995 | struct event_filter *tmp; |
38b78eb8 | 1996 | |
f306cc82 | 1997 | tmp = event_filter(file); |
38b78eb8 | 1998 | if (!err) |
f306cc82 | 1999 | event_set_filtered_flag(file); |
38b78eb8 | 2000 | else |
f306cc82 | 2001 | filter_disable(file); |
38b78eb8 | 2002 | |
f306cc82 | 2003 | event_set_filter(file, filter); |
38b78eb8 TH |
2004 | |
2005 | if (tmp) { | |
2006 | /* Make sure the call is done with the filter */ | |
2007 | synchronize_sched(); | |
2008 | __free_filter(tmp); | |
2009 | } | |
75b8e982 | 2010 | } |
8b372562 TZ |
2011 | |
2012 | return err; | |
2013 | } | |
2014 | ||
7967b3e0 | 2015 | int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, |
8b372562 TZ |
2016 | char *filter_string) |
2017 | { | |
ae63b31e | 2018 | struct event_subsystem *system = dir->subsystem; |
f306cc82 | 2019 | struct trace_array *tr = dir->tr; |
75b8e982 SR |
2020 | struct event_filter *filter; |
2021 | int err = 0; | |
8b372562 | 2022 | |
00e95830 | 2023 | mutex_lock(&event_mutex); |
8b372562 | 2024 | |
e9dbfae5 | 2025 | /* Make sure the system still has events */ |
ae63b31e | 2026 | if (!dir->nr_events) { |
e9dbfae5 SR |
2027 | err = -ENODEV; |
2028 | goto out_unlock; | |
2029 | } | |
2030 | ||
8b372562 | 2031 | if (!strcmp(strstrip(filter_string), "0")) { |
bb9ef1cb | 2032 | filter_free_subsystem_preds(dir, tr); |
8b372562 | 2033 | remove_filter_string(system->filter); |
75b8e982 SR |
2034 | filter = system->filter; |
2035 | system->filter = NULL; | |
2036 | /* Ensure all filters are no longer used */ | |
2037 | synchronize_sched(); | |
bb9ef1cb | 2038 | filter_free_subsystem_filters(dir, tr); |
75b8e982 | 2039 | __free_filter(filter); |
a66abe7f | 2040 | goto out_unlock; |
8b372562 TZ |
2041 | } |
2042 | ||
bb9ef1cb | 2043 | err = create_system_filter(dir, tr, filter_string, &filter); |
38b78eb8 TH |
2044 | if (filter) { |
2045 | /* | |
2046 | * No event actually uses the system filter | |
2047 | * we can free it without synchronize_sched(). | |
2048 | */ | |
2049 | __free_filter(system->filter); | |
2050 | system->filter = filter; | |
2051 | } | |
8cd995b6 | 2052 | out_unlock: |
00e95830 | 2053 | mutex_unlock(&event_mutex); |
8b372562 TZ |
2054 | |
2055 | return err; | |
2056 | } | |
7ce7e424 | 2057 | |
07b139c8 | 2058 | #ifdef CONFIG_PERF_EVENTS |
6fb2915d LZ |
2059 | |
2060 | void ftrace_profile_free_filter(struct perf_event *event) | |
2061 | { | |
2062 | struct event_filter *filter = event->filter; | |
2063 | ||
2064 | event->filter = NULL; | |
c9c53ca0 | 2065 | __free_filter(filter); |
6fb2915d LZ |
2066 | } |
2067 | ||
5500fa51 JO |
2068 | struct function_filter_data { |
2069 | struct ftrace_ops *ops; | |
2070 | int first_filter; | |
2071 | int first_notrace; | |
2072 | }; | |
2073 | ||
2074 | #ifdef CONFIG_FUNCTION_TRACER | |
2075 | static char ** | |
2076 | ftrace_function_filter_re(char *buf, int len, int *count) | |
2077 | { | |
2078 | char *str, *sep, **re; | |
2079 | ||
2080 | str = kstrndup(buf, len, GFP_KERNEL); | |
2081 | if (!str) | |
2082 | return NULL; | |
2083 | ||
2084 | /* | |
2085 | * The argv_split function takes white space | |
2086 | * as a separator, so convert ',' into spaces. | |
2087 | */ | |
2088 | while ((sep = strchr(str, ','))) | |
2089 | *sep = ' '; | |
2090 | ||
2091 | re = argv_split(GFP_KERNEL, str, count); | |
2092 | kfree(str); | |
2093 | return re; | |
2094 | } | |
2095 | ||
2096 | static int ftrace_function_set_regexp(struct ftrace_ops *ops, int filter, | |
2097 | int reset, char *re, int len) | |
2098 | { | |
2099 | int ret; | |
2100 | ||
2101 | if (filter) | |
2102 | ret = ftrace_set_filter(ops, re, len, reset); | |
2103 | else | |
2104 | ret = ftrace_set_notrace(ops, re, len, reset); | |
2105 | ||
2106 | return ret; | |
2107 | } | |
2108 | ||
2109 | static int __ftrace_function_set_filter(int filter, char *buf, int len, | |
2110 | struct function_filter_data *data) | |
2111 | { | |
92d8d4a8 | 2112 | int i, re_cnt, ret = -EINVAL; |
5500fa51 JO |
2113 | int *reset; |
2114 | char **re; | |
2115 | ||
2116 | reset = filter ? &data->first_filter : &data->first_notrace; | |
2117 | ||
2118 | /* | |
2119 | * The 'ip' field could have multiple filters set, separated | |
2120 | * either by space or comma. We first cut the filter and apply | |
2121 | * all pieces separatelly. | |
2122 | */ | |
2123 | re = ftrace_function_filter_re(buf, len, &re_cnt); | |
2124 | if (!re) | |
2125 | return -EINVAL; | |
2126 | ||
2127 | for (i = 0; i < re_cnt; i++) { | |
2128 | ret = ftrace_function_set_regexp(data->ops, filter, *reset, | |
2129 | re[i], strlen(re[i])); | |
2130 | if (ret) | |
2131 | break; | |
2132 | ||
2133 | if (*reset) | |
2134 | *reset = 0; | |
2135 | } | |
2136 | ||
2137 | argv_free(re); | |
2138 | return ret; | |
2139 | } | |
2140 | ||
2141 | static int ftrace_function_check_pred(struct filter_pred *pred, int leaf) | |
2142 | { | |
2143 | struct ftrace_event_field *field = pred->field; | |
2144 | ||
2145 | if (leaf) { | |
2146 | /* | |
2147 | * Check the leaf predicate for function trace, verify: | |
2148 | * - only '==' and '!=' is used | |
2149 | * - the 'ip' field is used | |
2150 | */ | |
2151 | if ((pred->op != OP_EQ) && (pred->op != OP_NE)) | |
2152 | return -EINVAL; | |
2153 | ||
2154 | if (strcmp(field->name, "ip")) | |
2155 | return -EINVAL; | |
2156 | } else { | |
2157 | /* | |
2158 | * Check the non leaf predicate for function trace, verify: | |
2159 | * - only '||' is used | |
2160 | */ | |
2161 | if (pred->op != OP_OR) | |
2162 | return -EINVAL; | |
2163 | } | |
2164 | ||
2165 | return 0; | |
2166 | } | |
2167 | ||
2168 | static int ftrace_function_set_filter_cb(enum move_type move, | |
2169 | struct filter_pred *pred, | |
2170 | int *err, void *data) | |
2171 | { | |
2172 | /* Checking the node is valid for function trace. */ | |
2173 | if ((move != MOVE_DOWN) || | |
2174 | (pred->left != FILTER_PRED_INVALID)) { | |
2175 | *err = ftrace_function_check_pred(pred, 0); | |
2176 | } else { | |
2177 | *err = ftrace_function_check_pred(pred, 1); | |
2178 | if (*err) | |
2179 | return WALK_PRED_ABORT; | |
2180 | ||
2181 | *err = __ftrace_function_set_filter(pred->op == OP_EQ, | |
2182 | pred->regex.pattern, | |
2183 | pred->regex.len, | |
2184 | data); | |
2185 | } | |
2186 | ||
2187 | return (*err) ? WALK_PRED_ABORT : WALK_PRED_DEFAULT; | |
2188 | } | |
2189 | ||
2190 | static int ftrace_function_set_filter(struct perf_event *event, | |
2191 | struct event_filter *filter) | |
2192 | { | |
2193 | struct function_filter_data data = { | |
2194 | .first_filter = 1, | |
2195 | .first_notrace = 1, | |
2196 | .ops = &event->ftrace_ops, | |
2197 | }; | |
2198 | ||
2199 | return walk_pred_tree(filter->preds, filter->root, | |
2200 | ftrace_function_set_filter_cb, &data); | |
2201 | } | |
2202 | #else | |
2203 | static int ftrace_function_set_filter(struct perf_event *event, | |
2204 | struct event_filter *filter) | |
2205 | { | |
2206 | return -ENODEV; | |
2207 | } | |
2208 | #endif /* CONFIG_FUNCTION_TRACER */ | |
2209 | ||
6fb2915d LZ |
2210 | int ftrace_profile_set_filter(struct perf_event *event, int event_id, |
2211 | char *filter_str) | |
2212 | { | |
2213 | int err; | |
2214 | struct event_filter *filter; | |
2425bcb9 | 2215 | struct trace_event_call *call; |
6fb2915d LZ |
2216 | |
2217 | mutex_lock(&event_mutex); | |
2218 | ||
3f78f935 | 2219 | call = event->tp_event; |
a66abe7f IM |
2220 | |
2221 | err = -EINVAL; | |
3f78f935 | 2222 | if (!call) |
a66abe7f | 2223 | goto out_unlock; |
6fb2915d | 2224 | |
a66abe7f | 2225 | err = -EEXIST; |
6fb2915d | 2226 | if (event->filter) |
a66abe7f | 2227 | goto out_unlock; |
6fb2915d | 2228 | |
38b78eb8 | 2229 | err = create_filter(call, filter_str, false, &filter); |
5500fa51 JO |
2230 | if (err) |
2231 | goto free_filter; | |
2232 | ||
2233 | if (ftrace_event_is_function(call)) | |
2234 | err = ftrace_function_set_filter(event, filter); | |
38b78eb8 | 2235 | else |
5500fa51 JO |
2236 | event->filter = filter; |
2237 | ||
2238 | free_filter: | |
2239 | if (err || ftrace_event_is_function(call)) | |
c9c53ca0 | 2240 | __free_filter(filter); |
6fb2915d | 2241 | |
a66abe7f | 2242 | out_unlock: |
6fb2915d LZ |
2243 | mutex_unlock(&event_mutex); |
2244 | ||
2245 | return err; | |
2246 | } | |
2247 | ||
07b139c8 | 2248 | #endif /* CONFIG_PERF_EVENTS */ |
6fb2915d | 2249 | |
1d0e78e3 JO |
2250 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
2251 | ||
2252 | #include <linux/types.h> | |
2253 | #include <linux/tracepoint.h> | |
2254 | ||
2255 | #define CREATE_TRACE_POINTS | |
2256 | #include "trace_events_filter_test.h" | |
2257 | ||
1d0e78e3 JO |
2258 | #define DATA_REC(m, va, vb, vc, vd, ve, vf, vg, vh, nvisit) \ |
2259 | { \ | |
2260 | .filter = FILTER, \ | |
2261 | .rec = { .a = va, .b = vb, .c = vc, .d = vd, \ | |
2262 | .e = ve, .f = vf, .g = vg, .h = vh }, \ | |
2263 | .match = m, \ | |
2264 | .not_visited = nvisit, \ | |
2265 | } | |
2266 | #define YES 1 | |
2267 | #define NO 0 | |
2268 | ||
2269 | static struct test_filter_data_t { | |
2270 | char *filter; | |
2271 | struct ftrace_raw_ftrace_test_filter rec; | |
2272 | int match; | |
2273 | char *not_visited; | |
2274 | } test_filter_data[] = { | |
2275 | #define FILTER "a == 1 && b == 1 && c == 1 && d == 1 && " \ | |
2276 | "e == 1 && f == 1 && g == 1 && h == 1" | |
2277 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, ""), | |
2278 | DATA_REC(NO, 0, 1, 1, 1, 1, 1, 1, 1, "bcdefgh"), | |
2279 | DATA_REC(NO, 1, 1, 1, 1, 1, 1, 1, 0, ""), | |
2280 | #undef FILTER | |
2281 | #define FILTER "a == 1 || b == 1 || c == 1 || d == 1 || " \ | |
2282 | "e == 1 || f == 1 || g == 1 || h == 1" | |
2283 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""), | |
2284 | DATA_REC(YES, 0, 0, 0, 0, 0, 0, 0, 1, ""), | |
2285 | DATA_REC(YES, 1, 0, 0, 0, 0, 0, 0, 0, "bcdefgh"), | |
2286 | #undef FILTER | |
2287 | #define FILTER "(a == 1 || b == 1) && (c == 1 || d == 1) && " \ | |
2288 | "(e == 1 || f == 1) && (g == 1 || h == 1)" | |
2289 | DATA_REC(NO, 0, 0, 1, 1, 1, 1, 1, 1, "dfh"), | |
2290 | DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""), | |
2291 | DATA_REC(YES, 1, 0, 1, 0, 0, 1, 0, 1, "bd"), | |
2292 | DATA_REC(NO, 1, 0, 1, 0, 0, 1, 0, 0, "bd"), | |
2293 | #undef FILTER | |
2294 | #define FILTER "(a == 1 && b == 1) || (c == 1 && d == 1) || " \ | |
2295 | "(e == 1 && f == 1) || (g == 1 && h == 1)" | |
2296 | DATA_REC(YES, 1, 0, 1, 1, 1, 1, 1, 1, "efgh"), | |
2297 | DATA_REC(YES, 0, 0, 0, 0, 0, 0, 1, 1, ""), | |
2298 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""), | |
2299 | #undef FILTER | |
2300 | #define FILTER "(a == 1 && b == 1) && (c == 1 && d == 1) && " \ | |
2301 | "(e == 1 && f == 1) || (g == 1 && h == 1)" | |
2302 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 0, "gh"), | |
2303 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""), | |
2304 | DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, ""), | |
2305 | #undef FILTER | |
2306 | #define FILTER "((a == 1 || b == 1) || (c == 1 || d == 1) || " \ | |
2307 | "(e == 1 || f == 1)) && (g == 1 || h == 1)" | |
2308 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 1, "bcdef"), | |
2309 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""), | |
2310 | DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, "h"), | |
2311 | #undef FILTER | |
2312 | #define FILTER "((((((((a == 1) && (b == 1)) || (c == 1)) && (d == 1)) || " \ | |
2313 | "(e == 1)) && (f == 1)) || (g == 1)) && (h == 1))" | |
2314 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "ceg"), | |
2315 | DATA_REC(NO, 0, 1, 0, 1, 0, 1, 0, 1, ""), | |
2316 | DATA_REC(NO, 1, 0, 1, 0, 1, 0, 1, 0, ""), | |
2317 | #undef FILTER | |
2318 | #define FILTER "((((((((a == 1) || (b == 1)) && (c == 1)) || (d == 1)) && " \ | |
2319 | "(e == 1)) || (f == 1)) && (g == 1)) || (h == 1))" | |
2320 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "bdfh"), | |
2321 | DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""), | |
2322 | DATA_REC(YES, 1, 0, 1, 0, 1, 0, 1, 0, "bdfh"), | |
2323 | }; | |
2324 | ||
2325 | #undef DATA_REC | |
2326 | #undef FILTER | |
2327 | #undef YES | |
2328 | #undef NO | |
2329 | ||
2330 | #define DATA_CNT (sizeof(test_filter_data)/sizeof(struct test_filter_data_t)) | |
2331 | ||
2332 | static int test_pred_visited; | |
2333 | ||
2334 | static int test_pred_visited_fn(struct filter_pred *pred, void *event) | |
2335 | { | |
2336 | struct ftrace_event_field *field = pred->field; | |
2337 | ||
2338 | test_pred_visited = 1; | |
2339 | printk(KERN_INFO "\npred visited %s\n", field->name); | |
2340 | return 1; | |
2341 | } | |
2342 | ||
2343 | static int test_walk_pred_cb(enum move_type move, struct filter_pred *pred, | |
2344 | int *err, void *data) | |
2345 | { | |
2346 | char *fields = data; | |
2347 | ||
2348 | if ((move == MOVE_DOWN) && | |
2349 | (pred->left == FILTER_PRED_INVALID)) { | |
2350 | struct ftrace_event_field *field = pred->field; | |
2351 | ||
2352 | if (!field) { | |
2353 | WARN(1, "all leafs should have field defined"); | |
2354 | return WALK_PRED_DEFAULT; | |
2355 | } | |
2356 | if (!strchr(fields, *field->name)) | |
2357 | return WALK_PRED_DEFAULT; | |
2358 | ||
2359 | WARN_ON(!pred->fn); | |
2360 | pred->fn = test_pred_visited_fn; | |
2361 | } | |
2362 | return WALK_PRED_DEFAULT; | |
2363 | } | |
2364 | ||
2365 | static __init int ftrace_test_event_filter(void) | |
2366 | { | |
2367 | int i; | |
2368 | ||
2369 | printk(KERN_INFO "Testing ftrace filter: "); | |
2370 | ||
2371 | for (i = 0; i < DATA_CNT; i++) { | |
2372 | struct event_filter *filter = NULL; | |
2373 | struct test_filter_data_t *d = &test_filter_data[i]; | |
2374 | int err; | |
2375 | ||
38b78eb8 TH |
2376 | err = create_filter(&event_ftrace_test_filter, d->filter, |
2377 | false, &filter); | |
1d0e78e3 JO |
2378 | if (err) { |
2379 | printk(KERN_INFO | |
2380 | "Failed to get filter for '%s', err %d\n", | |
2381 | d->filter, err); | |
38b78eb8 | 2382 | __free_filter(filter); |
1d0e78e3 JO |
2383 | break; |
2384 | } | |
2385 | ||
86b6ef21 SR |
2386 | /* |
2387 | * The preemption disabling is not really needed for self | |
2388 | * tests, but the rcu dereference will complain without it. | |
2389 | */ | |
2390 | preempt_disable(); | |
1d0e78e3 JO |
2391 | if (*d->not_visited) |
2392 | walk_pred_tree(filter->preds, filter->root, | |
2393 | test_walk_pred_cb, | |
2394 | d->not_visited); | |
2395 | ||
2396 | test_pred_visited = 0; | |
2397 | err = filter_match_preds(filter, &d->rec); | |
86b6ef21 | 2398 | preempt_enable(); |
1d0e78e3 JO |
2399 | |
2400 | __free_filter(filter); | |
2401 | ||
2402 | if (test_pred_visited) { | |
2403 | printk(KERN_INFO | |
2404 | "Failed, unwanted pred visited for filter %s\n", | |
2405 | d->filter); | |
2406 | break; | |
2407 | } | |
2408 | ||
2409 | if (err != d->match) { | |
2410 | printk(KERN_INFO | |
2411 | "Failed to match filter '%s', expected %d\n", | |
2412 | d->filter, d->match); | |
2413 | break; | |
2414 | } | |
2415 | } | |
2416 | ||
2417 | if (i == DATA_CNT) | |
2418 | printk(KERN_CONT "OK\n"); | |
2419 | ||
2420 | return 0; | |
2421 | } | |
2422 | ||
2423 | late_initcall(ftrace_test_event_filter); | |
2424 | ||
2425 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |