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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 | ||
9f616680 DW |
255 | /* Filter predicate for CPUs. */ |
256 | static int filter_pred_cpu(struct filter_pred *pred, void *event) | |
257 | { | |
258 | int cpu, cmp; | |
259 | int match = 0; | |
260 | ||
261 | cpu = raw_smp_processor_id(); | |
262 | cmp = pred->val; | |
263 | ||
264 | switch (pred->op) { | |
265 | case OP_EQ: | |
266 | match = cpu == cmp; | |
267 | break; | |
268 | case OP_LT: | |
269 | match = cpu < cmp; | |
270 | break; | |
271 | case OP_LE: | |
272 | match = cpu <= cmp; | |
273 | break; | |
274 | case OP_GT: | |
275 | match = cpu > cmp; | |
276 | break; | |
277 | case OP_GE: | |
278 | match = cpu >= cmp; | |
279 | break; | |
280 | default: | |
281 | break; | |
282 | } | |
283 | ||
284 | return !!match == !pred->not; | |
285 | } | |
286 | ||
287 | /* Filter predicate for COMM. */ | |
288 | static int filter_pred_comm(struct filter_pred *pred, void *event) | |
289 | { | |
290 | int cmp, match; | |
291 | ||
292 | cmp = pred->regex.match(current->comm, &pred->regex, | |
293 | pred->regex.field_len); | |
294 | match = cmp ^ pred->not; | |
295 | ||
296 | return match; | |
297 | } | |
298 | ||
58d9a597 | 299 | static int filter_pred_none(struct filter_pred *pred, void *event) |
0a19e53c TZ |
300 | { |
301 | return 0; | |
302 | } | |
303 | ||
d1303dd1 LZ |
304 | /* |
305 | * regex_match_foo - Basic regex callbacks | |
306 | * | |
307 | * @str: the string to be searched | |
308 | * @r: the regex structure containing the pattern string | |
309 | * @len: the length of the string to be searched (including '\0') | |
310 | * | |
311 | * Note: | |
312 | * - @str might not be NULL-terminated if it's of type DYN_STRING | |
313 | * or STATIC_STRING | |
314 | */ | |
315 | ||
1889d209 FW |
316 | static int regex_match_full(char *str, struct regex *r, int len) |
317 | { | |
318 | if (strncmp(str, r->pattern, len) == 0) | |
319 | return 1; | |
320 | return 0; | |
321 | } | |
322 | ||
323 | static int regex_match_front(char *str, struct regex *r, int len) | |
324 | { | |
285caad4 | 325 | if (strncmp(str, r->pattern, r->len) == 0) |
1889d209 FW |
326 | return 1; |
327 | return 0; | |
328 | } | |
329 | ||
330 | static int regex_match_middle(char *str, struct regex *r, int len) | |
331 | { | |
b2af211f | 332 | if (strnstr(str, r->pattern, len)) |
1889d209 FW |
333 | return 1; |
334 | return 0; | |
335 | } | |
336 | ||
337 | static int regex_match_end(char *str, struct regex *r, int len) | |
338 | { | |
a3291c14 | 339 | int strlen = len - 1; |
1889d209 | 340 | |
a3291c14 LZ |
341 | if (strlen >= r->len && |
342 | memcmp(str + strlen - r->len, r->pattern, r->len) == 0) | |
1889d209 FW |
343 | return 1; |
344 | return 0; | |
345 | } | |
346 | ||
3f6fe06d FW |
347 | /** |
348 | * filter_parse_regex - parse a basic regex | |
349 | * @buff: the raw regex | |
350 | * @len: length of the regex | |
351 | * @search: will point to the beginning of the string to compare | |
352 | * @not: tell whether the match will have to be inverted | |
353 | * | |
354 | * This passes in a buffer containing a regex and this function will | |
1889d209 FW |
355 | * set search to point to the search part of the buffer and |
356 | * return the type of search it is (see enum above). | |
357 | * This does modify buff. | |
358 | * | |
359 | * Returns enum type. | |
360 | * search returns the pointer to use for comparison. | |
361 | * not returns 1 if buff started with a '!' | |
362 | * 0 otherwise. | |
363 | */ | |
3f6fe06d | 364 | enum regex_type filter_parse_regex(char *buff, int len, char **search, int *not) |
1889d209 FW |
365 | { |
366 | int type = MATCH_FULL; | |
367 | int i; | |
368 | ||
369 | if (buff[0] == '!') { | |
370 | *not = 1; | |
371 | buff++; | |
372 | len--; | |
373 | } else | |
374 | *not = 0; | |
375 | ||
376 | *search = buff; | |
377 | ||
378 | for (i = 0; i < len; i++) { | |
379 | if (buff[i] == '*') { | |
380 | if (!i) { | |
381 | *search = buff + 1; | |
382 | type = MATCH_END_ONLY; | |
383 | } else { | |
384 | if (type == MATCH_END_ONLY) | |
385 | type = MATCH_MIDDLE_ONLY; | |
386 | else | |
387 | type = MATCH_FRONT_ONLY; | |
388 | buff[i] = 0; | |
389 | break; | |
390 | } | |
391 | } | |
392 | } | |
393 | ||
394 | return type; | |
395 | } | |
396 | ||
b0f1a59a | 397 | static void filter_build_regex(struct filter_pred *pred) |
1889d209 FW |
398 | { |
399 | struct regex *r = &pred->regex; | |
b0f1a59a LZ |
400 | char *search; |
401 | enum regex_type type = MATCH_FULL; | |
402 | int not = 0; | |
403 | ||
404 | if (pred->op == OP_GLOB) { | |
405 | type = filter_parse_regex(r->pattern, r->len, &search, ¬); | |
406 | r->len = strlen(search); | |
407 | memmove(r->pattern, search, r->len+1); | |
408 | } | |
1889d209 FW |
409 | |
410 | switch (type) { | |
411 | case MATCH_FULL: | |
412 | r->match = regex_match_full; | |
413 | break; | |
414 | case MATCH_FRONT_ONLY: | |
415 | r->match = regex_match_front; | |
416 | break; | |
417 | case MATCH_MIDDLE_ONLY: | |
418 | r->match = regex_match_middle; | |
419 | break; | |
420 | case MATCH_END_ONLY: | |
421 | r->match = regex_match_end; | |
422 | break; | |
423 | } | |
424 | ||
425 | pred->not ^= not; | |
1889d209 FW |
426 | } |
427 | ||
61e9dea2 SR |
428 | enum move_type { |
429 | MOVE_DOWN, | |
430 | MOVE_UP_FROM_LEFT, | |
431 | MOVE_UP_FROM_RIGHT | |
432 | }; | |
433 | ||
434 | static struct filter_pred * | |
435 | get_pred_parent(struct filter_pred *pred, struct filter_pred *preds, | |
436 | int index, enum move_type *move) | |
437 | { | |
438 | if (pred->parent & FILTER_PRED_IS_RIGHT) | |
439 | *move = MOVE_UP_FROM_RIGHT; | |
440 | else | |
441 | *move = MOVE_UP_FROM_LEFT; | |
442 | pred = &preds[pred->parent & ~FILTER_PRED_IS_RIGHT]; | |
443 | ||
444 | return pred; | |
445 | } | |
446 | ||
f03f5979 JO |
447 | enum walk_return { |
448 | WALK_PRED_ABORT, | |
449 | WALK_PRED_PARENT, | |
450 | WALK_PRED_DEFAULT, | |
451 | }; | |
452 | ||
453 | typedef int (*filter_pred_walkcb_t) (enum move_type move, | |
454 | struct filter_pred *pred, | |
455 | int *err, void *data); | |
456 | ||
457 | static int walk_pred_tree(struct filter_pred *preds, | |
458 | struct filter_pred *root, | |
459 | filter_pred_walkcb_t cb, void *data) | |
460 | { | |
461 | struct filter_pred *pred = root; | |
462 | enum move_type move = MOVE_DOWN; | |
463 | int done = 0; | |
464 | ||
465 | if (!preds) | |
466 | return -EINVAL; | |
467 | ||
468 | do { | |
469 | int err = 0, ret; | |
470 | ||
471 | ret = cb(move, pred, &err, data); | |
472 | if (ret == WALK_PRED_ABORT) | |
473 | return err; | |
474 | if (ret == WALK_PRED_PARENT) | |
475 | goto get_parent; | |
476 | ||
477 | switch (move) { | |
478 | case MOVE_DOWN: | |
479 | if (pred->left != FILTER_PRED_INVALID) { | |
480 | pred = &preds[pred->left]; | |
481 | continue; | |
482 | } | |
483 | goto get_parent; | |
484 | case MOVE_UP_FROM_LEFT: | |
485 | pred = &preds[pred->right]; | |
486 | move = MOVE_DOWN; | |
487 | continue; | |
488 | case MOVE_UP_FROM_RIGHT: | |
489 | get_parent: | |
490 | if (pred == root) | |
491 | break; | |
492 | pred = get_pred_parent(pred, preds, | |
493 | pred->parent, | |
494 | &move); | |
495 | continue; | |
496 | } | |
497 | done = 1; | |
498 | } while (!done); | |
499 | ||
500 | /* We are fine. */ | |
501 | return 0; | |
502 | } | |
503 | ||
43cd4145 SR |
504 | /* |
505 | * A series of AND or ORs where found together. Instead of | |
506 | * climbing up and down the tree branches, an array of the | |
507 | * ops were made in order of checks. We can just move across | |
508 | * the array and short circuit if needed. | |
509 | */ | |
510 | static int process_ops(struct filter_pred *preds, | |
511 | struct filter_pred *op, void *rec) | |
512 | { | |
513 | struct filter_pred *pred; | |
1ef1d1c2 | 514 | int match = 0; |
43cd4145 | 515 | int type; |
43cd4145 SR |
516 | int i; |
517 | ||
518 | /* | |
519 | * Micro-optimization: We set type to true if op | |
520 | * is an OR and false otherwise (AND). Then we | |
521 | * just need to test if the match is equal to | |
522 | * the type, and if it is, we can short circuit the | |
523 | * rest of the checks: | |
524 | * | |
525 | * if ((match && op->op == OP_OR) || | |
526 | * (!match && op->op == OP_AND)) | |
527 | * return match; | |
528 | */ | |
529 | type = op->op == OP_OR; | |
530 | ||
531 | for (i = 0; i < op->val; i++) { | |
532 | pred = &preds[op->ops[i]]; | |
f30120fc JO |
533 | if (!WARN_ON_ONCE(!pred->fn)) |
534 | match = pred->fn(pred, rec); | |
43cd4145 | 535 | if (!!match == type) |
eabb8980 | 536 | break; |
43cd4145 | 537 | } |
eabb8980 SRRH |
538 | /* If not of not match is equal to not of not, then it is a match */ |
539 | return !!match == !op->not; | |
43cd4145 SR |
540 | } |
541 | ||
f30120fc JO |
542 | struct filter_match_preds_data { |
543 | struct filter_pred *preds; | |
544 | int match; | |
545 | void *rec; | |
546 | }; | |
547 | ||
548 | static int filter_match_preds_cb(enum move_type move, struct filter_pred *pred, | |
549 | int *err, void *data) | |
550 | { | |
551 | struct filter_match_preds_data *d = data; | |
552 | ||
553 | *err = 0; | |
554 | switch (move) { | |
555 | case MOVE_DOWN: | |
556 | /* only AND and OR have children */ | |
557 | if (pred->left != FILTER_PRED_INVALID) { | |
558 | /* If ops is set, then it was folded. */ | |
559 | if (!pred->ops) | |
560 | return WALK_PRED_DEFAULT; | |
561 | /* We can treat folded ops as a leaf node */ | |
562 | d->match = process_ops(d->preds, pred, d->rec); | |
563 | } else { | |
564 | if (!WARN_ON_ONCE(!pred->fn)) | |
565 | d->match = pred->fn(pred, d->rec); | |
566 | } | |
567 | ||
568 | return WALK_PRED_PARENT; | |
569 | case MOVE_UP_FROM_LEFT: | |
570 | /* | |
571 | * Check for short circuits. | |
572 | * | |
573 | * Optimization: !!match == (pred->op == OP_OR) | |
574 | * is the same as: | |
575 | * if ((match && pred->op == OP_OR) || | |
576 | * (!match && pred->op == OP_AND)) | |
577 | */ | |
578 | if (!!d->match == (pred->op == OP_OR)) | |
579 | return WALK_PRED_PARENT; | |
580 | break; | |
581 | case MOVE_UP_FROM_RIGHT: | |
582 | break; | |
583 | } | |
584 | ||
585 | return WALK_PRED_DEFAULT; | |
586 | } | |
587 | ||
7ce7e424 | 588 | /* return 1 if event matches, 0 otherwise (discard) */ |
6fb2915d | 589 | int filter_match_preds(struct event_filter *filter, void *rec) |
7ce7e424 | 590 | { |
74e9e58c | 591 | struct filter_pred *preds; |
61e9dea2 | 592 | struct filter_pred *root; |
f30120fc JO |
593 | struct filter_match_preds_data data = { |
594 | /* match is currently meaningless */ | |
595 | .match = -1, | |
596 | .rec = rec, | |
597 | }; | |
598 | int n_preds, ret; | |
7ce7e424 | 599 | |
6d54057d | 600 | /* no filter is considered a match */ |
75b8e982 SR |
601 | if (!filter) |
602 | return 1; | |
603 | ||
604 | n_preds = filter->n_preds; | |
6d54057d SR |
605 | if (!n_preds) |
606 | return 1; | |
607 | ||
c9c53ca0 | 608 | /* |
61e9dea2 | 609 | * n_preds, root and filter->preds are protect with preemption disabled. |
c9c53ca0 | 610 | */ |
61e9dea2 SR |
611 | root = rcu_dereference_sched(filter->root); |
612 | if (!root) | |
613 | return 1; | |
c9c53ca0 | 614 | |
f30120fc JO |
615 | data.preds = preds = rcu_dereference_sched(filter->preds); |
616 | ret = walk_pred_tree(preds, root, filter_match_preds_cb, &data); | |
617 | WARN_ON(ret); | |
618 | return data.match; | |
7ce7e424 | 619 | } |
17c873ec | 620 | EXPORT_SYMBOL_GPL(filter_match_preds); |
7ce7e424 | 621 | |
8b372562 | 622 | static void parse_error(struct filter_parse_state *ps, int err, int pos) |
7ce7e424 | 623 | { |
8b372562 TZ |
624 | ps->lasterr = err; |
625 | ps->lasterr_pos = pos; | |
626 | } | |
7ce7e424 | 627 | |
8b372562 TZ |
628 | static void remove_filter_string(struct event_filter *filter) |
629 | { | |
75b8e982 SR |
630 | if (!filter) |
631 | return; | |
632 | ||
8b372562 TZ |
633 | kfree(filter->filter_string); |
634 | filter->filter_string = NULL; | |
635 | } | |
636 | ||
637 | static int replace_filter_string(struct event_filter *filter, | |
638 | char *filter_string) | |
639 | { | |
640 | kfree(filter->filter_string); | |
641 | filter->filter_string = kstrdup(filter_string, GFP_KERNEL); | |
642 | if (!filter->filter_string) | |
643 | return -ENOMEM; | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | static int append_filter_string(struct event_filter *filter, | |
649 | char *string) | |
650 | { | |
651 | int newlen; | |
652 | char *new_filter_string; | |
653 | ||
654 | BUG_ON(!filter->filter_string); | |
655 | newlen = strlen(filter->filter_string) + strlen(string) + 1; | |
656 | new_filter_string = kmalloc(newlen, GFP_KERNEL); | |
657 | if (!new_filter_string) | |
658 | return -ENOMEM; | |
659 | ||
660 | strcpy(new_filter_string, filter->filter_string); | |
661 | strcat(new_filter_string, string); | |
662 | kfree(filter->filter_string); | |
663 | filter->filter_string = new_filter_string; | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
668 | static void append_filter_err(struct filter_parse_state *ps, | |
669 | struct event_filter *filter) | |
670 | { | |
671 | int pos = ps->lasterr_pos; | |
672 | char *buf, *pbuf; | |
673 | ||
674 | buf = (char *)__get_free_page(GFP_TEMPORARY); | |
675 | if (!buf) | |
4bda2d51 | 676 | return; |
7ce7e424 | 677 | |
8b372562 TZ |
678 | append_filter_string(filter, "\n"); |
679 | memset(buf, ' ', PAGE_SIZE); | |
680 | if (pos > PAGE_SIZE - 128) | |
681 | pos = 0; | |
682 | buf[pos] = '^'; | |
683 | pbuf = &buf[pos] + 1; | |
684 | ||
685 | sprintf(pbuf, "\nparse_error: %s\n", err_text[ps->lasterr]); | |
686 | append_filter_string(filter, buf); | |
687 | free_page((unsigned long) buf); | |
7ce7e424 TZ |
688 | } |
689 | ||
7f1d2f82 | 690 | static inline struct event_filter *event_filter(struct trace_event_file *file) |
f306cc82 TZ |
691 | { |
692 | if (file->event_call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
693 | return file->event_call->filter; | |
694 | else | |
695 | return file->filter; | |
696 | } | |
697 | ||
e2912b09 | 698 | /* caller must hold event_mutex */ |
7f1d2f82 | 699 | void print_event_filter(struct trace_event_file *file, struct trace_seq *s) |
ac1adc55 | 700 | { |
f306cc82 | 701 | struct event_filter *filter = event_filter(file); |
8b372562 | 702 | |
8e254c1d | 703 | if (filter && filter->filter_string) |
8b372562 TZ |
704 | trace_seq_printf(s, "%s\n", filter->filter_string); |
705 | else | |
146c3442 | 706 | trace_seq_puts(s, "none\n"); |
ac1adc55 TZ |
707 | } |
708 | ||
8b372562 | 709 | void print_subsystem_event_filter(struct event_subsystem *system, |
ac1adc55 TZ |
710 | struct trace_seq *s) |
711 | { | |
75b8e982 | 712 | struct event_filter *filter; |
8b372562 | 713 | |
00e95830 | 714 | mutex_lock(&event_mutex); |
75b8e982 | 715 | filter = system->filter; |
8e254c1d | 716 | if (filter && filter->filter_string) |
8b372562 TZ |
717 | trace_seq_printf(s, "%s\n", filter->filter_string); |
718 | else | |
146c3442 | 719 | trace_seq_puts(s, DEFAULT_SYS_FILTER_MESSAGE "\n"); |
00e95830 | 720 | mutex_unlock(&event_mutex); |
ac1adc55 TZ |
721 | } |
722 | ||
61e9dea2 SR |
723 | static int __alloc_pred_stack(struct pred_stack *stack, int n_preds) |
724 | { | |
47b0edcb | 725 | stack->preds = kcalloc(n_preds + 1, sizeof(*stack->preds), GFP_KERNEL); |
61e9dea2 SR |
726 | if (!stack->preds) |
727 | return -ENOMEM; | |
728 | stack->index = n_preds; | |
729 | return 0; | |
730 | } | |
731 | ||
732 | static void __free_pred_stack(struct pred_stack *stack) | |
733 | { | |
734 | kfree(stack->preds); | |
735 | stack->index = 0; | |
736 | } | |
737 | ||
738 | static int __push_pred_stack(struct pred_stack *stack, | |
739 | struct filter_pred *pred) | |
740 | { | |
741 | int index = stack->index; | |
742 | ||
743 | if (WARN_ON(index == 0)) | |
744 | return -ENOSPC; | |
745 | ||
746 | stack->preds[--index] = pred; | |
747 | stack->index = index; | |
748 | return 0; | |
749 | } | |
750 | ||
751 | static struct filter_pred * | |
752 | __pop_pred_stack(struct pred_stack *stack) | |
753 | { | |
754 | struct filter_pred *pred; | |
755 | int index = stack->index; | |
756 | ||
757 | pred = stack->preds[index++]; | |
758 | if (!pred) | |
759 | return NULL; | |
760 | ||
761 | stack->index = index; | |
762 | return pred; | |
763 | } | |
764 | ||
765 | static int filter_set_pred(struct event_filter *filter, | |
766 | int idx, | |
767 | struct pred_stack *stack, | |
9d96cd17 | 768 | struct filter_pred *src) |
0a19e53c | 769 | { |
61e9dea2 SR |
770 | struct filter_pred *dest = &filter->preds[idx]; |
771 | struct filter_pred *left; | |
772 | struct filter_pred *right; | |
773 | ||
0a19e53c | 774 | *dest = *src; |
61e9dea2 | 775 | dest->index = idx; |
0a19e53c | 776 | |
61e9dea2 SR |
777 | if (dest->op == OP_OR || dest->op == OP_AND) { |
778 | right = __pop_pred_stack(stack); | |
779 | left = __pop_pred_stack(stack); | |
780 | if (!left || !right) | |
781 | return -EINVAL; | |
43cd4145 SR |
782 | /* |
783 | * If both children can be folded | |
784 | * and they are the same op as this op or a leaf, | |
785 | * then this op can be folded. | |
786 | */ | |
787 | if (left->index & FILTER_PRED_FOLD && | |
eabb8980 | 788 | ((left->op == dest->op && !left->not) || |
43cd4145 SR |
789 | left->left == FILTER_PRED_INVALID) && |
790 | right->index & FILTER_PRED_FOLD && | |
eabb8980 | 791 | ((right->op == dest->op && !right->not) || |
43cd4145 SR |
792 | right->left == FILTER_PRED_INVALID)) |
793 | dest->index |= FILTER_PRED_FOLD; | |
794 | ||
795 | dest->left = left->index & ~FILTER_PRED_FOLD; | |
796 | dest->right = right->index & ~FILTER_PRED_FOLD; | |
797 | left->parent = dest->index & ~FILTER_PRED_FOLD; | |
61e9dea2 | 798 | right->parent = dest->index | FILTER_PRED_IS_RIGHT; |
43cd4145 | 799 | } else { |
61e9dea2 SR |
800 | /* |
801 | * Make dest->left invalid to be used as a quick | |
802 | * way to know this is a leaf node. | |
803 | */ | |
804 | dest->left = FILTER_PRED_INVALID; | |
805 | ||
43cd4145 SR |
806 | /* All leafs allow folding the parent ops. */ |
807 | dest->index |= FILTER_PRED_FOLD; | |
808 | } | |
809 | ||
61e9dea2 | 810 | return __push_pred_stack(stack, dest); |
0a19e53c TZ |
811 | } |
812 | ||
c9c53ca0 SR |
813 | static void __free_preds(struct event_filter *filter) |
814 | { | |
60705c89 SRRH |
815 | int i; |
816 | ||
c9c53ca0 | 817 | if (filter->preds) { |
60705c89 SRRH |
818 | for (i = 0; i < filter->n_preds; i++) |
819 | kfree(filter->preds[i].ops); | |
c9c53ca0 SR |
820 | kfree(filter->preds); |
821 | filter->preds = NULL; | |
822 | } | |
823 | filter->a_preds = 0; | |
824 | filter->n_preds = 0; | |
825 | } | |
826 | ||
7f1d2f82 | 827 | static void filter_disable(struct trace_event_file *file) |
f306cc82 | 828 | { |
2425bcb9 | 829 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
830 | |
831 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
b5d09db5 | 832 | call->flags &= ~TRACE_EVENT_FL_FILTERED; |
f306cc82 | 833 | else |
5d6ad960 | 834 | file->flags &= ~EVENT_FILE_FL_FILTERED; |
f306cc82 TZ |
835 | } |
836 | ||
c9c53ca0 | 837 | static void __free_filter(struct event_filter *filter) |
2df75e41 | 838 | { |
8e254c1d LZ |
839 | if (!filter) |
840 | return; | |
841 | ||
c9c53ca0 | 842 | __free_preds(filter); |
57be8887 | 843 | kfree(filter->filter_string); |
2df75e41 | 844 | kfree(filter); |
6fb2915d LZ |
845 | } |
846 | ||
bac5fb97 TZ |
847 | void free_event_filter(struct event_filter *filter) |
848 | { | |
849 | __free_filter(filter); | |
850 | } | |
851 | ||
c9c53ca0 | 852 | static struct event_filter *__alloc_filter(void) |
0a19e53c | 853 | { |
30e673b2 | 854 | struct event_filter *filter; |
0a19e53c | 855 | |
6fb2915d | 856 | filter = kzalloc(sizeof(*filter), GFP_KERNEL); |
c9c53ca0 SR |
857 | return filter; |
858 | } | |
859 | ||
860 | static int __alloc_preds(struct event_filter *filter, int n_preds) | |
861 | { | |
862 | struct filter_pred *pred; | |
863 | int i; | |
864 | ||
4defe682 SR |
865 | if (filter->preds) |
866 | __free_preds(filter); | |
867 | ||
47b0edcb | 868 | filter->preds = kcalloc(n_preds, sizeof(*filter->preds), GFP_KERNEL); |
c9c53ca0 | 869 | |
30e673b2 | 870 | if (!filter->preds) |
c9c53ca0 SR |
871 | return -ENOMEM; |
872 | ||
4defe682 SR |
873 | filter->a_preds = n_preds; |
874 | filter->n_preds = 0; | |
30e673b2 | 875 | |
c9c53ca0 | 876 | for (i = 0; i < n_preds; i++) { |
74e9e58c | 877 | pred = &filter->preds[i]; |
0a19e53c | 878 | pred->fn = filter_pred_none; |
0a19e53c TZ |
879 | } |
880 | ||
c9c53ca0 | 881 | return 0; |
6fb2915d LZ |
882 | } |
883 | ||
7f1d2f82 | 884 | static inline void __remove_filter(struct trace_event_file *file) |
8e254c1d | 885 | { |
2425bcb9 | 886 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
887 | |
888 | filter_disable(file); | |
889 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
890 | remove_filter_string(call->filter); | |
891 | else | |
892 | remove_filter_string(file->filter); | |
893 | } | |
894 | ||
7967b3e0 | 895 | static void filter_free_subsystem_preds(struct trace_subsystem_dir *dir, |
f306cc82 TZ |
896 | struct trace_array *tr) |
897 | { | |
7f1d2f82 | 898 | struct trace_event_file *file; |
8e254c1d | 899 | |
f306cc82 | 900 | list_for_each_entry(file, &tr->events, list) { |
bb9ef1cb | 901 | if (file->system != dir) |
8e254c1d | 902 | continue; |
f306cc82 | 903 | __remove_filter(file); |
8e254c1d | 904 | } |
8e254c1d | 905 | } |
7ce7e424 | 906 | |
7f1d2f82 | 907 | static inline void __free_subsystem_filter(struct trace_event_file *file) |
cfb180f3 | 908 | { |
2425bcb9 | 909 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
910 | |
911 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) { | |
912 | __free_filter(call->filter); | |
913 | call->filter = NULL; | |
914 | } else { | |
915 | __free_filter(file->filter); | |
916 | file->filter = NULL; | |
917 | } | |
918 | } | |
919 | ||
7967b3e0 | 920 | static void filter_free_subsystem_filters(struct trace_subsystem_dir *dir, |
f306cc82 TZ |
921 | struct trace_array *tr) |
922 | { | |
7f1d2f82 | 923 | struct trace_event_file *file; |
cfb180f3 | 924 | |
f306cc82 | 925 | list_for_each_entry(file, &tr->events, list) { |
bb9ef1cb | 926 | if (file->system != dir) |
8e254c1d | 927 | continue; |
f306cc82 | 928 | __free_subsystem_filter(file); |
cfb180f3 TZ |
929 | } |
930 | } | |
931 | ||
9d96cd17 JO |
932 | static int filter_add_pred(struct filter_parse_state *ps, |
933 | struct event_filter *filter, | |
934 | struct filter_pred *pred, | |
935 | struct pred_stack *stack) | |
7ce7e424 | 936 | { |
61aaef55 | 937 | int err; |
7ce7e424 | 938 | |
c9c53ca0 | 939 | if (WARN_ON(filter->n_preds == filter->a_preds)) { |
8b372562 | 940 | parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0); |
0a19e53c | 941 | return -ENOSPC; |
8b372562 | 942 | } |
7ce7e424 | 943 | |
61aaef55 | 944 | err = filter_set_pred(filter, filter->n_preds, stack, pred); |
0a19e53c TZ |
945 | if (err) |
946 | return err; | |
947 | ||
30e673b2 | 948 | filter->n_preds++; |
7ce7e424 | 949 | |
0a19e53c | 950 | return 0; |
7ce7e424 TZ |
951 | } |
952 | ||
aa38e9fc | 953 | int filter_assign_type(const char *type) |
7ce7e424 | 954 | { |
7fcb7c47 LZ |
955 | if (strstr(type, "__data_loc") && strstr(type, "char")) |
956 | return FILTER_DYN_STRING; | |
957 | ||
7ce7e424 | 958 | if (strchr(type, '[') && strstr(type, "char")) |
e8808c10 FW |
959 | return FILTER_STATIC_STRING; |
960 | ||
aa38e9fc LZ |
961 | return FILTER_OTHER; |
962 | } | |
963 | ||
907bff91 | 964 | static bool is_legal_op(struct ftrace_event_field *field, int op) |
8b372562 | 965 | { |
b0f1a59a LZ |
966 | if (is_string_field(field) && |
967 | (op != OP_EQ && op != OP_NE && op != OP_GLOB)) | |
907bff91 | 968 | return false; |
b0f1a59a | 969 | if (!is_string_field(field) && op == OP_GLOB) |
907bff91 | 970 | return false; |
8b372562 | 971 | |
907bff91 | 972 | return true; |
8b372562 TZ |
973 | } |
974 | ||
975 | static filter_pred_fn_t select_comparison_fn(int op, int field_size, | |
976 | int field_is_signed) | |
977 | { | |
978 | filter_pred_fn_t fn = NULL; | |
979 | ||
980 | switch (field_size) { | |
981 | case 8: | |
982 | if (op == OP_EQ || op == OP_NE) | |
983 | fn = filter_pred_64; | |
984 | else if (field_is_signed) | |
985 | fn = filter_pred_s64; | |
986 | else | |
987 | fn = filter_pred_u64; | |
988 | break; | |
989 | case 4: | |
990 | if (op == OP_EQ || op == OP_NE) | |
991 | fn = filter_pred_32; | |
992 | else if (field_is_signed) | |
993 | fn = filter_pred_s32; | |
994 | else | |
995 | fn = filter_pred_u32; | |
996 | break; | |
997 | case 2: | |
998 | if (op == OP_EQ || op == OP_NE) | |
999 | fn = filter_pred_16; | |
1000 | else if (field_is_signed) | |
1001 | fn = filter_pred_s16; | |
1002 | else | |
1003 | fn = filter_pred_u16; | |
1004 | break; | |
1005 | case 1: | |
1006 | if (op == OP_EQ || op == OP_NE) | |
1007 | fn = filter_pred_8; | |
1008 | else if (field_is_signed) | |
1009 | fn = filter_pred_s8; | |
1010 | else | |
1011 | fn = filter_pred_u8; | |
1012 | break; | |
1013 | } | |
1014 | ||
1015 | return fn; | |
1016 | } | |
1017 | ||
9d96cd17 | 1018 | static int init_pred(struct filter_parse_state *ps, |
61aaef55 | 1019 | struct ftrace_event_field *field, |
9d96cd17 JO |
1020 | struct filter_pred *pred) |
1021 | ||
7ce7e424 | 1022 | { |
9d96cd17 | 1023 | filter_pred_fn_t fn = filter_pred_none; |
f66578a7 | 1024 | unsigned long long val; |
5e4904cb | 1025 | int ret; |
7ce7e424 | 1026 | |
7ce7e424 TZ |
1027 | pred->offset = field->offset; |
1028 | ||
8b372562 TZ |
1029 | if (!is_legal_op(field, pred->op)) { |
1030 | parse_error(ps, FILT_ERR_ILLEGAL_FIELD_OP, 0); | |
1031 | return -EINVAL; | |
1032 | } | |
1033 | ||
e57cbaf0 SRRH |
1034 | if (field->filter_type == FILTER_COMM) { |
1035 | filter_build_regex(pred); | |
1036 | fn = filter_pred_comm; | |
1037 | pred->regex.field_len = TASK_COMM_LEN; | |
1038 | } else if (is_string_field(field)) { | |
b0f1a59a | 1039 | filter_build_regex(pred); |
87a342f5 | 1040 | |
e57cbaf0 | 1041 | if (field->filter_type == FILTER_STATIC_STRING) { |
e8808c10 | 1042 | fn = filter_pred_string; |
1889d209 FW |
1043 | pred->regex.field_len = field->size; |
1044 | } else if (field->filter_type == FILTER_DYN_STRING) | |
b0f1a59a | 1045 | fn = filter_pred_strloc; |
16da27a8 | 1046 | else |
87a342f5 | 1047 | fn = filter_pred_pchar; |
5500fa51 JO |
1048 | } else if (is_function_field(field)) { |
1049 | if (strcmp(field->name, "ip")) { | |
1050 | parse_error(ps, FILT_ERR_IP_FIELD_ONLY, 0); | |
1051 | return -EINVAL; | |
1052 | } | |
1053 | } else { | |
5e4904cb | 1054 | if (field->is_signed) |
bcd83ea6 | 1055 | ret = kstrtoll(pred->regex.pattern, 0, &val); |
5e4904cb | 1056 | else |
bcd83ea6 | 1057 | ret = kstrtoull(pred->regex.pattern, 0, &val); |
5e4904cb | 1058 | if (ret) { |
8b372562 | 1059 | parse_error(ps, FILT_ERR_ILLEGAL_INTVAL, 0); |
9f58a159 | 1060 | return -EINVAL; |
8b372562 | 1061 | } |
f66578a7 | 1062 | pred->val = val; |
7ce7e424 | 1063 | |
e57cbaf0 | 1064 | if (field->filter_type == FILTER_CPU) |
9f616680 DW |
1065 | fn = filter_pred_cpu; |
1066 | else | |
1067 | fn = select_comparison_fn(pred->op, field->size, | |
1f9963cb LZ |
1068 | field->is_signed); |
1069 | if (!fn) { | |
1070 | parse_error(ps, FILT_ERR_INVALID_OP, 0); | |
1071 | return -EINVAL; | |
1072 | } | |
7ce7e424 TZ |
1073 | } |
1074 | ||
8b372562 | 1075 | if (pred->op == OP_NE) |
e12c09cf | 1076 | pred->not ^= 1; |
ac1adc55 | 1077 | |
9d96cd17 | 1078 | pred->fn = fn; |
1f9963cb | 1079 | return 0; |
cfb180f3 TZ |
1080 | } |
1081 | ||
8b372562 TZ |
1082 | static void parse_init(struct filter_parse_state *ps, |
1083 | struct filter_op *ops, | |
1084 | char *infix_string) | |
1085 | { | |
1086 | memset(ps, '\0', sizeof(*ps)); | |
1087 | ||
1088 | ps->infix.string = infix_string; | |
1089 | ps->infix.cnt = strlen(infix_string); | |
1090 | ps->ops = ops; | |
1091 | ||
1092 | INIT_LIST_HEAD(&ps->opstack); | |
1093 | INIT_LIST_HEAD(&ps->postfix); | |
1094 | } | |
1095 | ||
1096 | static char infix_next(struct filter_parse_state *ps) | |
1097 | { | |
6b88f44e SRRH |
1098 | if (!ps->infix.cnt) |
1099 | return 0; | |
1100 | ||
8b372562 TZ |
1101 | ps->infix.cnt--; |
1102 | ||
1103 | return ps->infix.string[ps->infix.tail++]; | |
1104 | } | |
1105 | ||
1106 | static char infix_peek(struct filter_parse_state *ps) | |
1107 | { | |
1108 | if (ps->infix.tail == strlen(ps->infix.string)) | |
1109 | return 0; | |
1110 | ||
1111 | return ps->infix.string[ps->infix.tail]; | |
1112 | } | |
1113 | ||
1114 | static void infix_advance(struct filter_parse_state *ps) | |
1115 | { | |
6b88f44e SRRH |
1116 | if (!ps->infix.cnt) |
1117 | return; | |
1118 | ||
8b372562 TZ |
1119 | ps->infix.cnt--; |
1120 | ps->infix.tail++; | |
1121 | } | |
1122 | ||
1123 | static inline int is_precedence_lower(struct filter_parse_state *ps, | |
1124 | int a, int b) | |
1125 | { | |
1126 | return ps->ops[a].precedence < ps->ops[b].precedence; | |
1127 | } | |
1128 | ||
1129 | static inline int is_op_char(struct filter_parse_state *ps, char c) | |
1130 | { | |
1131 | int i; | |
1132 | ||
1133 | for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) { | |
1134 | if (ps->ops[i].string[0] == c) | |
1135 | return 1; | |
1136 | } | |
c4cff064 | 1137 | |
0a19e53c | 1138 | return 0; |
cfb180f3 TZ |
1139 | } |
1140 | ||
8b372562 TZ |
1141 | static int infix_get_op(struct filter_parse_state *ps, char firstc) |
1142 | { | |
1143 | char nextc = infix_peek(ps); | |
1144 | char opstr[3]; | |
1145 | int i; | |
1146 | ||
1147 | opstr[0] = firstc; | |
1148 | opstr[1] = nextc; | |
1149 | opstr[2] = '\0'; | |
1150 | ||
1151 | for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) { | |
1152 | if (!strcmp(opstr, ps->ops[i].string)) { | |
1153 | infix_advance(ps); | |
1154 | return ps->ops[i].id; | |
7ce7e424 | 1155 | } |
8b372562 TZ |
1156 | } |
1157 | ||
1158 | opstr[1] = '\0'; | |
1159 | ||
1160 | for (i = 0; strcmp(ps->ops[i].string, "OP_NONE"); i++) { | |
1161 | if (!strcmp(opstr, ps->ops[i].string)) | |
1162 | return ps->ops[i].id; | |
1163 | } | |
1164 | ||
1165 | return OP_NONE; | |
1166 | } | |
1167 | ||
1168 | static inline void clear_operand_string(struct filter_parse_state *ps) | |
1169 | { | |
1170 | memset(ps->operand.string, '\0', MAX_FILTER_STR_VAL); | |
1171 | ps->operand.tail = 0; | |
1172 | } | |
1173 | ||
1174 | static inline int append_operand_char(struct filter_parse_state *ps, char c) | |
1175 | { | |
5872144f | 1176 | if (ps->operand.tail == MAX_FILTER_STR_VAL - 1) |
8b372562 TZ |
1177 | return -EINVAL; |
1178 | ||
1179 | ps->operand.string[ps->operand.tail++] = c; | |
1180 | ||
1181 | return 0; | |
1182 | } | |
1183 | ||
1184 | static int filter_opstack_push(struct filter_parse_state *ps, int op) | |
1185 | { | |
1186 | struct opstack_op *opstack_op; | |
1187 | ||
1188 | opstack_op = kmalloc(sizeof(*opstack_op), GFP_KERNEL); | |
1189 | if (!opstack_op) | |
1190 | return -ENOMEM; | |
1191 | ||
1192 | opstack_op->op = op; | |
1193 | list_add(&opstack_op->list, &ps->opstack); | |
1194 | ||
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | static int filter_opstack_empty(struct filter_parse_state *ps) | |
1199 | { | |
1200 | return list_empty(&ps->opstack); | |
1201 | } | |
1202 | ||
1203 | static int filter_opstack_top(struct filter_parse_state *ps) | |
1204 | { | |
1205 | struct opstack_op *opstack_op; | |
1206 | ||
1207 | if (filter_opstack_empty(ps)) | |
1208 | return OP_NONE; | |
1209 | ||
1210 | opstack_op = list_first_entry(&ps->opstack, struct opstack_op, list); | |
1211 | ||
1212 | return opstack_op->op; | |
1213 | } | |
1214 | ||
1215 | static int filter_opstack_pop(struct filter_parse_state *ps) | |
1216 | { | |
1217 | struct opstack_op *opstack_op; | |
1218 | int op; | |
1219 | ||
1220 | if (filter_opstack_empty(ps)) | |
1221 | return OP_NONE; | |
1222 | ||
1223 | opstack_op = list_first_entry(&ps->opstack, struct opstack_op, list); | |
1224 | op = opstack_op->op; | |
1225 | list_del(&opstack_op->list); | |
1226 | ||
1227 | kfree(opstack_op); | |
1228 | ||
1229 | return op; | |
1230 | } | |
1231 | ||
1232 | static void filter_opstack_clear(struct filter_parse_state *ps) | |
1233 | { | |
1234 | while (!filter_opstack_empty(ps)) | |
1235 | filter_opstack_pop(ps); | |
1236 | } | |
1237 | ||
1238 | static char *curr_operand(struct filter_parse_state *ps) | |
1239 | { | |
1240 | return ps->operand.string; | |
1241 | } | |
1242 | ||
1243 | static int postfix_append_operand(struct filter_parse_state *ps, char *operand) | |
1244 | { | |
1245 | struct postfix_elt *elt; | |
1246 | ||
1247 | elt = kmalloc(sizeof(*elt), GFP_KERNEL); | |
1248 | if (!elt) | |
1249 | return -ENOMEM; | |
1250 | ||
1251 | elt->op = OP_NONE; | |
1252 | elt->operand = kstrdup(operand, GFP_KERNEL); | |
1253 | if (!elt->operand) { | |
1254 | kfree(elt); | |
1255 | return -ENOMEM; | |
1256 | } | |
1257 | ||
1258 | list_add_tail(&elt->list, &ps->postfix); | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | static int postfix_append_op(struct filter_parse_state *ps, int op) | |
1264 | { | |
1265 | struct postfix_elt *elt; | |
1266 | ||
1267 | elt = kmalloc(sizeof(*elt), GFP_KERNEL); | |
1268 | if (!elt) | |
1269 | return -ENOMEM; | |
1270 | ||
1271 | elt->op = op; | |
1272 | elt->operand = NULL; | |
1273 | ||
1274 | list_add_tail(&elt->list, &ps->postfix); | |
1275 | ||
1276 | return 0; | |
1277 | } | |
1278 | ||
1279 | static void postfix_clear(struct filter_parse_state *ps) | |
1280 | { | |
1281 | struct postfix_elt *elt; | |
1282 | ||
1283 | while (!list_empty(&ps->postfix)) { | |
1284 | elt = list_first_entry(&ps->postfix, struct postfix_elt, list); | |
8b372562 | 1285 | list_del(&elt->list); |
8ad80731 LZ |
1286 | kfree(elt->operand); |
1287 | kfree(elt); | |
8b372562 TZ |
1288 | } |
1289 | } | |
1290 | ||
1291 | static int filter_parse(struct filter_parse_state *ps) | |
1292 | { | |
5928c3cc | 1293 | int in_string = 0; |
8b372562 TZ |
1294 | int op, top_op; |
1295 | char ch; | |
1296 | ||
1297 | while ((ch = infix_next(ps))) { | |
5928c3cc FW |
1298 | if (ch == '"') { |
1299 | in_string ^= 1; | |
1300 | continue; | |
1301 | } | |
1302 | ||
1303 | if (in_string) | |
1304 | goto parse_operand; | |
1305 | ||
8b372562 TZ |
1306 | if (isspace(ch)) |
1307 | continue; | |
1308 | ||
1309 | if (is_op_char(ps, ch)) { | |
1310 | op = infix_get_op(ps, ch); | |
1311 | if (op == OP_NONE) { | |
1312 | parse_error(ps, FILT_ERR_INVALID_OP, 0); | |
7ce7e424 TZ |
1313 | return -EINVAL; |
1314 | } | |
8b372562 TZ |
1315 | |
1316 | if (strlen(curr_operand(ps))) { | |
1317 | postfix_append_operand(ps, curr_operand(ps)); | |
1318 | clear_operand_string(ps); | |
1319 | } | |
1320 | ||
1321 | while (!filter_opstack_empty(ps)) { | |
1322 | top_op = filter_opstack_top(ps); | |
1323 | if (!is_precedence_lower(ps, top_op, op)) { | |
1324 | top_op = filter_opstack_pop(ps); | |
1325 | postfix_append_op(ps, top_op); | |
1326 | continue; | |
1327 | } | |
1328 | break; | |
1329 | } | |
1330 | ||
1331 | filter_opstack_push(ps, op); | |
7ce7e424 TZ |
1332 | continue; |
1333 | } | |
8b372562 TZ |
1334 | |
1335 | if (ch == '(') { | |
1336 | filter_opstack_push(ps, OP_OPEN_PAREN); | |
1337 | continue; | |
1338 | } | |
1339 | ||
1340 | if (ch == ')') { | |
1341 | if (strlen(curr_operand(ps))) { | |
1342 | postfix_append_operand(ps, curr_operand(ps)); | |
1343 | clear_operand_string(ps); | |
1344 | } | |
1345 | ||
1346 | top_op = filter_opstack_pop(ps); | |
1347 | while (top_op != OP_NONE) { | |
1348 | if (top_op == OP_OPEN_PAREN) | |
1349 | break; | |
1350 | postfix_append_op(ps, top_op); | |
1351 | top_op = filter_opstack_pop(ps); | |
1352 | } | |
1353 | if (top_op == OP_NONE) { | |
1354 | parse_error(ps, FILT_ERR_UNBALANCED_PAREN, 0); | |
1355 | return -EINVAL; | |
7ce7e424 | 1356 | } |
7ce7e424 TZ |
1357 | continue; |
1358 | } | |
5928c3cc | 1359 | parse_operand: |
8b372562 TZ |
1360 | if (append_operand_char(ps, ch)) { |
1361 | parse_error(ps, FILT_ERR_OPERAND_TOO_LONG, 0); | |
1362 | return -EINVAL; | |
1363 | } | |
1364 | } | |
1365 | ||
1366 | if (strlen(curr_operand(ps))) | |
1367 | postfix_append_operand(ps, curr_operand(ps)); | |
1368 | ||
1369 | while (!filter_opstack_empty(ps)) { | |
1370 | top_op = filter_opstack_pop(ps); | |
1371 | if (top_op == OP_NONE) | |
1372 | break; | |
1373 | if (top_op == OP_OPEN_PAREN) { | |
1374 | parse_error(ps, FILT_ERR_UNBALANCED_PAREN, 0); | |
1375 | return -EINVAL; | |
1376 | } | |
1377 | postfix_append_op(ps, top_op); | |
1378 | } | |
1379 | ||
1380 | return 0; | |
1381 | } | |
1382 | ||
81570d9c | 1383 | static struct filter_pred *create_pred(struct filter_parse_state *ps, |
2425bcb9 | 1384 | struct trace_event_call *call, |
81570d9c | 1385 | int op, char *operand1, char *operand2) |
8b372562 | 1386 | { |
61aaef55 | 1387 | struct ftrace_event_field *field; |
81570d9c | 1388 | static struct filter_pred pred; |
8b372562 | 1389 | |
81570d9c JO |
1390 | memset(&pred, 0, sizeof(pred)); |
1391 | pred.op = op; | |
8b372562 | 1392 | |
81570d9c JO |
1393 | if (op == OP_AND || op == OP_OR) |
1394 | return &pred; | |
1395 | ||
1396 | if (!operand1 || !operand2) { | |
1397 | parse_error(ps, FILT_ERR_MISSING_FIELD, 0); | |
8b372562 TZ |
1398 | return NULL; |
1399 | } | |
1400 | ||
b3a8c6fd | 1401 | field = trace_find_event_field(call, operand1); |
61aaef55 JO |
1402 | if (!field) { |
1403 | parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0); | |
8b372562 | 1404 | return NULL; |
61aaef55 | 1405 | } |
8b372562 | 1406 | |
81570d9c JO |
1407 | strcpy(pred.regex.pattern, operand2); |
1408 | pred.regex.len = strlen(pred.regex.pattern); | |
1d0e78e3 | 1409 | pred.field = field; |
61aaef55 | 1410 | return init_pred(ps, field, &pred) ? NULL : &pred; |
8b372562 TZ |
1411 | } |
1412 | ||
1413 | static int check_preds(struct filter_parse_state *ps) | |
1414 | { | |
1415 | int n_normal_preds = 0, n_logical_preds = 0; | |
1416 | struct postfix_elt *elt; | |
2cf30dc1 | 1417 | int cnt = 0; |
8b372562 TZ |
1418 | |
1419 | list_for_each_entry(elt, &ps->postfix, list) { | |
2cf30dc1 SR |
1420 | if (elt->op == OP_NONE) { |
1421 | cnt++; | |
8b372562 | 1422 | continue; |
2cf30dc1 | 1423 | } |
8b372562 TZ |
1424 | |
1425 | if (elt->op == OP_AND || elt->op == OP_OR) { | |
1426 | n_logical_preds++; | |
2cf30dc1 | 1427 | cnt--; |
8b372562 | 1428 | continue; |
7ce7e424 | 1429 | } |
2cf30dc1 SR |
1430 | if (elt->op != OP_NOT) |
1431 | cnt--; | |
8b372562 | 1432 | n_normal_preds++; |
b4875bbe SRRH |
1433 | /* all ops should have operands */ |
1434 | if (cnt < 0) | |
1435 | break; | |
7ce7e424 TZ |
1436 | } |
1437 | ||
2cf30dc1 | 1438 | if (cnt != 1 || !n_normal_preds || n_logical_preds >= n_normal_preds) { |
8b372562 | 1439 | parse_error(ps, FILT_ERR_INVALID_FILTER, 0); |
bcabd91c LZ |
1440 | return -EINVAL; |
1441 | } | |
1442 | ||
8b372562 TZ |
1443 | return 0; |
1444 | } | |
f66578a7 | 1445 | |
c9c53ca0 SR |
1446 | static int count_preds(struct filter_parse_state *ps) |
1447 | { | |
1448 | struct postfix_elt *elt; | |
1449 | int n_preds = 0; | |
1450 | ||
1451 | list_for_each_entry(elt, &ps->postfix, list) { | |
1452 | if (elt->op == OP_NONE) | |
1453 | continue; | |
1454 | n_preds++; | |
1455 | } | |
1456 | ||
1457 | return n_preds; | |
1458 | } | |
1459 | ||
f03f5979 JO |
1460 | struct check_pred_data { |
1461 | int count; | |
1462 | int max; | |
1463 | }; | |
1464 | ||
1465 | static int check_pred_tree_cb(enum move_type move, struct filter_pred *pred, | |
1466 | int *err, void *data) | |
1467 | { | |
1468 | struct check_pred_data *d = data; | |
1469 | ||
1470 | if (WARN_ON(d->count++ > d->max)) { | |
1471 | *err = -EINVAL; | |
1472 | return WALK_PRED_ABORT; | |
1473 | } | |
1474 | return WALK_PRED_DEFAULT; | |
1475 | } | |
1476 | ||
ec126cac SR |
1477 | /* |
1478 | * The tree is walked at filtering of an event. If the tree is not correctly | |
1479 | * built, it may cause an infinite loop. Check here that the tree does | |
1480 | * indeed terminate. | |
1481 | */ | |
1482 | static int check_pred_tree(struct event_filter *filter, | |
1483 | struct filter_pred *root) | |
1484 | { | |
f03f5979 JO |
1485 | struct check_pred_data data = { |
1486 | /* | |
1487 | * The max that we can hit a node is three times. | |
1488 | * Once going down, once coming up from left, and | |
1489 | * once coming up from right. This is more than enough | |
1490 | * since leafs are only hit a single time. | |
1491 | */ | |
1492 | .max = 3 * filter->n_preds, | |
1493 | .count = 0, | |
1494 | }; | |
ec126cac | 1495 | |
f03f5979 JO |
1496 | return walk_pred_tree(filter->preds, root, |
1497 | check_pred_tree_cb, &data); | |
ec126cac SR |
1498 | } |
1499 | ||
c00b060f JO |
1500 | static int count_leafs_cb(enum move_type move, struct filter_pred *pred, |
1501 | int *err, void *data) | |
43cd4145 | 1502 | { |
c00b060f | 1503 | int *count = data; |
43cd4145 | 1504 | |
c00b060f JO |
1505 | if ((move == MOVE_DOWN) && |
1506 | (pred->left == FILTER_PRED_INVALID)) | |
1507 | (*count)++; | |
43cd4145 | 1508 | |
c00b060f JO |
1509 | return WALK_PRED_DEFAULT; |
1510 | } | |
1511 | ||
1512 | static int count_leafs(struct filter_pred *preds, struct filter_pred *root) | |
1513 | { | |
1514 | int count = 0, ret; | |
43cd4145 | 1515 | |
c00b060f JO |
1516 | ret = walk_pred_tree(preds, root, count_leafs_cb, &count); |
1517 | WARN_ON(ret); | |
43cd4145 SR |
1518 | return count; |
1519 | } | |
1520 | ||
96bc293a JO |
1521 | struct fold_pred_data { |
1522 | struct filter_pred *root; | |
1523 | int count; | |
1524 | int children; | |
1525 | }; | |
1526 | ||
1527 | static int fold_pred_cb(enum move_type move, struct filter_pred *pred, | |
1528 | int *err, void *data) | |
1529 | { | |
1530 | struct fold_pred_data *d = data; | |
1531 | struct filter_pred *root = d->root; | |
1532 | ||
1533 | if (move != MOVE_DOWN) | |
1534 | return WALK_PRED_DEFAULT; | |
1535 | if (pred->left != FILTER_PRED_INVALID) | |
1536 | return WALK_PRED_DEFAULT; | |
1537 | ||
1538 | if (WARN_ON(d->count == d->children)) { | |
1539 | *err = -EINVAL; | |
1540 | return WALK_PRED_ABORT; | |
1541 | } | |
1542 | ||
1543 | pred->index &= ~FILTER_PRED_FOLD; | |
1544 | root->ops[d->count++] = pred->index; | |
1545 | return WALK_PRED_DEFAULT; | |
1546 | } | |
1547 | ||
43cd4145 SR |
1548 | static int fold_pred(struct filter_pred *preds, struct filter_pred *root) |
1549 | { | |
96bc293a JO |
1550 | struct fold_pred_data data = { |
1551 | .root = root, | |
1552 | .count = 0, | |
1553 | }; | |
43cd4145 | 1554 | int children; |
43cd4145 SR |
1555 | |
1556 | /* No need to keep the fold flag */ | |
1557 | root->index &= ~FILTER_PRED_FOLD; | |
1558 | ||
1559 | /* If the root is a leaf then do nothing */ | |
1560 | if (root->left == FILTER_PRED_INVALID) | |
1561 | return 0; | |
1562 | ||
1563 | /* count the children */ | |
1564 | children = count_leafs(preds, &preds[root->left]); | |
1565 | children += count_leafs(preds, &preds[root->right]); | |
1566 | ||
47b0edcb | 1567 | root->ops = kcalloc(children, sizeof(*root->ops), GFP_KERNEL); |
43cd4145 SR |
1568 | if (!root->ops) |
1569 | return -ENOMEM; | |
1570 | ||
1571 | root->val = children; | |
96bc293a JO |
1572 | data.children = children; |
1573 | return walk_pred_tree(preds, root, fold_pred_cb, &data); | |
43cd4145 SR |
1574 | } |
1575 | ||
1b797fe5 JO |
1576 | static int fold_pred_tree_cb(enum move_type move, struct filter_pred *pred, |
1577 | int *err, void *data) | |
1578 | { | |
1579 | struct filter_pred *preds = data; | |
1580 | ||
1581 | if (move != MOVE_DOWN) | |
1582 | return WALK_PRED_DEFAULT; | |
1583 | if (!(pred->index & FILTER_PRED_FOLD)) | |
1584 | return WALK_PRED_DEFAULT; | |
1585 | ||
1586 | *err = fold_pred(preds, pred); | |
1587 | if (*err) | |
1588 | return WALK_PRED_ABORT; | |
1589 | ||
1590 | /* eveyrhing below is folded, continue with parent */ | |
1591 | return WALK_PRED_PARENT; | |
1592 | } | |
1593 | ||
43cd4145 SR |
1594 | /* |
1595 | * To optimize the processing of the ops, if we have several "ors" or | |
1596 | * "ands" together, we can put them in an array and process them all | |
1597 | * together speeding up the filter logic. | |
1598 | */ | |
1599 | static int fold_pred_tree(struct event_filter *filter, | |
1600 | struct filter_pred *root) | |
1601 | { | |
1b797fe5 JO |
1602 | return walk_pred_tree(filter->preds, root, fold_pred_tree_cb, |
1603 | filter->preds); | |
43cd4145 SR |
1604 | } |
1605 | ||
2425bcb9 | 1606 | static int replace_preds(struct trace_event_call *call, |
6fb2915d | 1607 | struct event_filter *filter, |
8b372562 | 1608 | struct filter_parse_state *ps, |
1f9963cb | 1609 | bool dry_run) |
8b372562 TZ |
1610 | { |
1611 | char *operand1 = NULL, *operand2 = NULL; | |
1612 | struct filter_pred *pred; | |
ec126cac | 1613 | struct filter_pred *root; |
8b372562 | 1614 | struct postfix_elt *elt; |
61e9dea2 | 1615 | struct pred_stack stack = { }; /* init to NULL */ |
8b372562 | 1616 | int err; |
1f9963cb | 1617 | int n_preds = 0; |
8b372562 | 1618 | |
c9c53ca0 SR |
1619 | n_preds = count_preds(ps); |
1620 | if (n_preds >= MAX_FILTER_PRED) { | |
1621 | parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0); | |
1622 | return -ENOSPC; | |
1623 | } | |
1624 | ||
8b372562 TZ |
1625 | err = check_preds(ps); |
1626 | if (err) | |
1627 | return err; | |
1628 | ||
c9c53ca0 | 1629 | if (!dry_run) { |
61e9dea2 | 1630 | err = __alloc_pred_stack(&stack, n_preds); |
c9c53ca0 SR |
1631 | if (err) |
1632 | return err; | |
61e9dea2 SR |
1633 | err = __alloc_preds(filter, n_preds); |
1634 | if (err) | |
1635 | goto fail; | |
c9c53ca0 SR |
1636 | } |
1637 | ||
1638 | n_preds = 0; | |
8b372562 TZ |
1639 | list_for_each_entry(elt, &ps->postfix, list) { |
1640 | if (elt->op == OP_NONE) { | |
1641 | if (!operand1) | |
1642 | operand1 = elt->operand; | |
1643 | else if (!operand2) | |
1644 | operand2 = elt->operand; | |
1645 | else { | |
1646 | parse_error(ps, FILT_ERR_TOO_MANY_OPERANDS, 0); | |
61e9dea2 SR |
1647 | err = -EINVAL; |
1648 | goto fail; | |
8b372562 TZ |
1649 | } |
1650 | continue; | |
1651 | } | |
1652 | ||
e12c09cf SRRH |
1653 | if (elt->op == OP_NOT) { |
1654 | if (!n_preds || operand1 || operand2) { | |
1655 | parse_error(ps, FILT_ERR_ILLEGAL_NOT_OP, 0); | |
1656 | err = -EINVAL; | |
1657 | goto fail; | |
1658 | } | |
1659 | if (!dry_run) | |
1660 | filter->preds[n_preds - 1].not ^= 1; | |
1661 | continue; | |
1662 | } | |
1663 | ||
c9c53ca0 | 1664 | if (WARN_ON(n_preds++ == MAX_FILTER_PRED)) { |
1f9963cb | 1665 | parse_error(ps, FILT_ERR_TOO_MANY_PREDS, 0); |
61e9dea2 SR |
1666 | err = -ENOSPC; |
1667 | goto fail; | |
1f9963cb LZ |
1668 | } |
1669 | ||
9d96cd17 | 1670 | pred = create_pred(ps, call, elt->op, operand1, operand2); |
61e9dea2 | 1671 | if (!pred) { |
61aaef55 | 1672 | err = -EINVAL; |
61e9dea2 SR |
1673 | goto fail; |
1674 | } | |
61aaef55 | 1675 | |
9d96cd17 JO |
1676 | if (!dry_run) { |
1677 | err = filter_add_pred(ps, filter, pred, &stack); | |
61aaef55 | 1678 | if (err) |
9d96cd17 | 1679 | goto fail; |
9d96cd17 | 1680 | } |
8b372562 TZ |
1681 | |
1682 | operand1 = operand2 = NULL; | |
1683 | } | |
7ce7e424 | 1684 | |
61e9dea2 SR |
1685 | if (!dry_run) { |
1686 | /* We should have one item left on the stack */ | |
1687 | pred = __pop_pred_stack(&stack); | |
1688 | if (!pred) | |
1689 | return -EINVAL; | |
1690 | /* This item is where we start from in matching */ | |
ec126cac | 1691 | root = pred; |
61e9dea2 SR |
1692 | /* Make sure the stack is empty */ |
1693 | pred = __pop_pred_stack(&stack); | |
1694 | if (WARN_ON(pred)) { | |
1695 | err = -EINVAL; | |
1696 | filter->root = NULL; | |
1697 | goto fail; | |
1698 | } | |
ec126cac SR |
1699 | err = check_pred_tree(filter, root); |
1700 | if (err) | |
1701 | goto fail; | |
1702 | ||
43cd4145 SR |
1703 | /* Optimize the tree */ |
1704 | err = fold_pred_tree(filter, root); | |
1705 | if (err) | |
1706 | goto fail; | |
1707 | ||
ec126cac SR |
1708 | /* We don't set root until we know it works */ |
1709 | barrier(); | |
1710 | filter->root = root; | |
61e9dea2 SR |
1711 | } |
1712 | ||
1713 | err = 0; | |
1714 | fail: | |
1715 | __free_pred_stack(&stack); | |
1716 | return err; | |
7ce7e424 TZ |
1717 | } |
1718 | ||
7f1d2f82 | 1719 | static inline void event_set_filtered_flag(struct trace_event_file *file) |
f306cc82 | 1720 | { |
2425bcb9 | 1721 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1722 | |
1723 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
1724 | call->flags |= TRACE_EVENT_FL_FILTERED; | |
1725 | else | |
5d6ad960 | 1726 | file->flags |= EVENT_FILE_FL_FILTERED; |
f306cc82 TZ |
1727 | } |
1728 | ||
7f1d2f82 | 1729 | static inline void event_set_filter(struct trace_event_file *file, |
f306cc82 TZ |
1730 | struct event_filter *filter) |
1731 | { | |
2425bcb9 | 1732 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1733 | |
1734 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
1735 | rcu_assign_pointer(call->filter, filter); | |
1736 | else | |
1737 | rcu_assign_pointer(file->filter, filter); | |
1738 | } | |
1739 | ||
7f1d2f82 | 1740 | static inline void event_clear_filter(struct trace_event_file *file) |
f306cc82 | 1741 | { |
2425bcb9 | 1742 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1743 | |
1744 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
1745 | RCU_INIT_POINTER(call->filter, NULL); | |
1746 | else | |
1747 | RCU_INIT_POINTER(file->filter, NULL); | |
1748 | } | |
1749 | ||
1750 | static inline void | |
7f1d2f82 | 1751 | event_set_no_set_filter_flag(struct trace_event_file *file) |
f306cc82 | 1752 | { |
2425bcb9 | 1753 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1754 | |
1755 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
1756 | call->flags |= TRACE_EVENT_FL_NO_SET_FILTER; | |
1757 | else | |
5d6ad960 | 1758 | file->flags |= EVENT_FILE_FL_NO_SET_FILTER; |
f306cc82 TZ |
1759 | } |
1760 | ||
1761 | static inline void | |
7f1d2f82 | 1762 | event_clear_no_set_filter_flag(struct trace_event_file *file) |
f306cc82 | 1763 | { |
2425bcb9 | 1764 | struct trace_event_call *call = file->event_call; |
f306cc82 TZ |
1765 | |
1766 | if (call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) | |
1767 | call->flags &= ~TRACE_EVENT_FL_NO_SET_FILTER; | |
1768 | else | |
5d6ad960 | 1769 | file->flags &= ~EVENT_FILE_FL_NO_SET_FILTER; |
f306cc82 TZ |
1770 | } |
1771 | ||
1772 | static inline bool | |
7f1d2f82 | 1773 | event_no_set_filter_flag(struct trace_event_file *file) |
f306cc82 | 1774 | { |
2425bcb9 | 1775 | struct trace_event_call *call = file->event_call; |
f306cc82 | 1776 | |
5d6ad960 | 1777 | if (file->flags & EVENT_FILE_FL_NO_SET_FILTER) |
f306cc82 TZ |
1778 | return true; |
1779 | ||
1780 | if ((call->flags & TRACE_EVENT_FL_USE_CALL_FILTER) && | |
1781 | (call->flags & TRACE_EVENT_FL_NO_SET_FILTER)) | |
1782 | return true; | |
1783 | ||
1784 | return false; | |
1785 | } | |
1786 | ||
75b8e982 SR |
1787 | struct filter_list { |
1788 | struct list_head list; | |
1789 | struct event_filter *filter; | |
1790 | }; | |
1791 | ||
7967b3e0 | 1792 | static int replace_system_preds(struct trace_subsystem_dir *dir, |
f306cc82 | 1793 | struct trace_array *tr, |
fce29d15 LZ |
1794 | struct filter_parse_state *ps, |
1795 | char *filter_string) | |
1796 | { | |
7f1d2f82 | 1797 | struct trace_event_file *file; |
75b8e982 SR |
1798 | struct filter_list *filter_item; |
1799 | struct filter_list *tmp; | |
1800 | LIST_HEAD(filter_list); | |
fce29d15 | 1801 | bool fail = true; |
a66abe7f | 1802 | int err; |
fce29d15 | 1803 | |
f306cc82 | 1804 | list_for_each_entry(file, &tr->events, list) { |
bb9ef1cb | 1805 | if (file->system != dir) |
fce29d15 LZ |
1806 | continue; |
1807 | ||
75b8e982 SR |
1808 | /* |
1809 | * Try to see if the filter can be applied | |
1810 | * (filter arg is ignored on dry_run) | |
1811 | */ | |
6355d544 | 1812 | err = replace_preds(file->event_call, NULL, ps, true); |
fce29d15 | 1813 | if (err) |
f306cc82 | 1814 | event_set_no_set_filter_flag(file); |
ed0449af | 1815 | else |
f306cc82 | 1816 | event_clear_no_set_filter_flag(file); |
0fc3ca9a SR |
1817 | } |
1818 | ||
f306cc82 | 1819 | list_for_each_entry(file, &tr->events, list) { |
75b8e982 | 1820 | struct event_filter *filter; |
0fc3ca9a | 1821 | |
bb9ef1cb | 1822 | if (file->system != dir) |
0fc3ca9a SR |
1823 | continue; |
1824 | ||
f306cc82 | 1825 | if (event_no_set_filter_flag(file)) |
ed0449af LZ |
1826 | continue; |
1827 | ||
75b8e982 SR |
1828 | filter_item = kzalloc(sizeof(*filter_item), GFP_KERNEL); |
1829 | if (!filter_item) | |
1830 | goto fail_mem; | |
0fc3ca9a | 1831 | |
75b8e982 | 1832 | list_add_tail(&filter_item->list, &filter_list); |
0fc3ca9a | 1833 | |
75b8e982 SR |
1834 | filter_item->filter = __alloc_filter(); |
1835 | if (!filter_item->filter) | |
1836 | goto fail_mem; | |
1837 | filter = filter_item->filter; | |
0fc3ca9a | 1838 | |
75b8e982 SR |
1839 | /* Can only fail on no memory */ |
1840 | err = replace_filter_string(filter, filter_string); | |
1841 | if (err) | |
1842 | goto fail_mem; | |
fce29d15 | 1843 | |
6355d544 | 1844 | err = replace_preds(file->event_call, filter, ps, false); |
75b8e982 | 1845 | if (err) { |
f306cc82 | 1846 | filter_disable(file); |
75b8e982 SR |
1847 | parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0); |
1848 | append_filter_err(ps, filter); | |
1849 | } else | |
f306cc82 | 1850 | event_set_filtered_flag(file); |
75b8e982 SR |
1851 | /* |
1852 | * Regardless of if this returned an error, we still | |
1853 | * replace the filter for the call. | |
1854 | */ | |
f306cc82 TZ |
1855 | filter = event_filter(file); |
1856 | event_set_filter(file, filter_item->filter); | |
75b8e982 SR |
1857 | filter_item->filter = filter; |
1858 | ||
fce29d15 LZ |
1859 | fail = false; |
1860 | } | |
1861 | ||
0fc3ca9a SR |
1862 | if (fail) |
1863 | goto fail; | |
1864 | ||
75b8e982 SR |
1865 | /* |
1866 | * The calls can still be using the old filters. | |
1867 | * Do a synchronize_sched() to ensure all calls are | |
1868 | * done with them before we free them. | |
1869 | */ | |
1870 | synchronize_sched(); | |
1871 | list_for_each_entry_safe(filter_item, tmp, &filter_list, list) { | |
1872 | __free_filter(filter_item->filter); | |
1873 | list_del(&filter_item->list); | |
1874 | kfree(filter_item); | |
1875 | } | |
fce29d15 | 1876 | return 0; |
0fc3ca9a | 1877 | fail: |
75b8e982 SR |
1878 | /* No call succeeded */ |
1879 | list_for_each_entry_safe(filter_item, tmp, &filter_list, list) { | |
1880 | list_del(&filter_item->list); | |
1881 | kfree(filter_item); | |
1882 | } | |
0fc3ca9a SR |
1883 | parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0); |
1884 | return -EINVAL; | |
75b8e982 SR |
1885 | fail_mem: |
1886 | /* If any call succeeded, we still need to sync */ | |
1887 | if (!fail) | |
1888 | synchronize_sched(); | |
1889 | list_for_each_entry_safe(filter_item, tmp, &filter_list, list) { | |
1890 | __free_filter(filter_item->filter); | |
1891 | list_del(&filter_item->list); | |
1892 | kfree(filter_item); | |
1893 | } | |
1894 | return -ENOMEM; | |
fce29d15 LZ |
1895 | } |
1896 | ||
38b78eb8 TH |
1897 | static int create_filter_start(char *filter_str, bool set_str, |
1898 | struct filter_parse_state **psp, | |
1899 | struct event_filter **filterp) | |
1900 | { | |
1901 | struct event_filter *filter; | |
1902 | struct filter_parse_state *ps = NULL; | |
1903 | int err = 0; | |
1904 | ||
1905 | WARN_ON_ONCE(*psp || *filterp); | |
1906 | ||
1907 | /* allocate everything, and if any fails, free all and fail */ | |
1908 | filter = __alloc_filter(); | |
1909 | if (filter && set_str) | |
1910 | err = replace_filter_string(filter, filter_str); | |
1911 | ||
1912 | ps = kzalloc(sizeof(*ps), GFP_KERNEL); | |
1913 | ||
1914 | if (!filter || !ps || err) { | |
1915 | kfree(ps); | |
1916 | __free_filter(filter); | |
1917 | return -ENOMEM; | |
1918 | } | |
1919 | ||
1920 | /* we're committed to creating a new filter */ | |
1921 | *filterp = filter; | |
1922 | *psp = ps; | |
1923 | ||
1924 | parse_init(ps, filter_ops, filter_str); | |
1925 | err = filter_parse(ps); | |
1926 | if (err && set_str) | |
1927 | append_filter_err(ps, filter); | |
1928 | return err; | |
1929 | } | |
1930 | ||
1931 | static void create_filter_finish(struct filter_parse_state *ps) | |
1932 | { | |
1933 | if (ps) { | |
1934 | filter_opstack_clear(ps); | |
1935 | postfix_clear(ps); | |
1936 | kfree(ps); | |
1937 | } | |
1938 | } | |
1939 | ||
1940 | /** | |
2425bcb9 SRRH |
1941 | * create_filter - create a filter for a trace_event_call |
1942 | * @call: trace_event_call to create a filter for | |
38b78eb8 TH |
1943 | * @filter_str: filter string |
1944 | * @set_str: remember @filter_str and enable detailed error in filter | |
1945 | * @filterp: out param for created filter (always updated on return) | |
1946 | * | |
1947 | * Creates a filter for @call with @filter_str. If @set_str is %true, | |
1948 | * @filter_str is copied and recorded in the new filter. | |
1949 | * | |
1950 | * On success, returns 0 and *@filterp points to the new filter. On | |
1951 | * failure, returns -errno and *@filterp may point to %NULL or to a new | |
1952 | * filter. In the latter case, the returned filter contains error | |
1953 | * information if @set_str is %true and the caller is responsible for | |
1954 | * freeing it. | |
1955 | */ | |
2425bcb9 | 1956 | static int create_filter(struct trace_event_call *call, |
38b78eb8 TH |
1957 | char *filter_str, bool set_str, |
1958 | struct event_filter **filterp) | |
1959 | { | |
1960 | struct event_filter *filter = NULL; | |
1961 | struct filter_parse_state *ps = NULL; | |
1962 | int err; | |
1963 | ||
1964 | err = create_filter_start(filter_str, set_str, &ps, &filter); | |
1965 | if (!err) { | |
6355d544 | 1966 | err = replace_preds(call, filter, ps, false); |
38b78eb8 TH |
1967 | if (err && set_str) |
1968 | append_filter_err(ps, filter); | |
1969 | } | |
1970 | create_filter_finish(ps); | |
1971 | ||
1972 | *filterp = filter; | |
1973 | return err; | |
1974 | } | |
1975 | ||
2425bcb9 | 1976 | int create_event_filter(struct trace_event_call *call, |
bac5fb97 TZ |
1977 | char *filter_str, bool set_str, |
1978 | struct event_filter **filterp) | |
1979 | { | |
1980 | return create_filter(call, filter_str, set_str, filterp); | |
1981 | } | |
1982 | ||
38b78eb8 TH |
1983 | /** |
1984 | * create_system_filter - create a filter for an event_subsystem | |
1985 | * @system: event_subsystem to create a filter for | |
1986 | * @filter_str: filter string | |
1987 | * @filterp: out param for created filter (always updated on return) | |
1988 | * | |
1989 | * Identical to create_filter() except that it creates a subsystem filter | |
1990 | * and always remembers @filter_str. | |
1991 | */ | |
7967b3e0 | 1992 | static int create_system_filter(struct trace_subsystem_dir *dir, |
f306cc82 | 1993 | struct trace_array *tr, |
38b78eb8 TH |
1994 | char *filter_str, struct event_filter **filterp) |
1995 | { | |
1996 | struct event_filter *filter = NULL; | |
1997 | struct filter_parse_state *ps = NULL; | |
1998 | int err; | |
1999 | ||
2000 | err = create_filter_start(filter_str, true, &ps, &filter); | |
2001 | if (!err) { | |
bb9ef1cb | 2002 | err = replace_system_preds(dir, tr, ps, filter_str); |
38b78eb8 TH |
2003 | if (!err) { |
2004 | /* System filters just show a default message */ | |
2005 | kfree(filter->filter_string); | |
2006 | filter->filter_string = NULL; | |
2007 | } else { | |
2008 | append_filter_err(ps, filter); | |
2009 | } | |
2010 | } | |
2011 | create_filter_finish(ps); | |
2012 | ||
2013 | *filterp = filter; | |
2014 | return err; | |
2015 | } | |
2016 | ||
e2912b09 | 2017 | /* caller must hold event_mutex */ |
7f1d2f82 | 2018 | int apply_event_filter(struct trace_event_file *file, char *filter_string) |
8b372562 | 2019 | { |
2425bcb9 | 2020 | struct trace_event_call *call = file->event_call; |
75b8e982 | 2021 | struct event_filter *filter; |
e2912b09 | 2022 | int err; |
8b372562 TZ |
2023 | |
2024 | if (!strcmp(strstrip(filter_string), "0")) { | |
f306cc82 TZ |
2025 | filter_disable(file); |
2026 | filter = event_filter(file); | |
2027 | ||
75b8e982 | 2028 | if (!filter) |
e2912b09 | 2029 | return 0; |
f306cc82 TZ |
2030 | |
2031 | event_clear_filter(file); | |
2032 | ||
f76690af SR |
2033 | /* Make sure the filter is not being used */ |
2034 | synchronize_sched(); | |
75b8e982 | 2035 | __free_filter(filter); |
f306cc82 | 2036 | |
e2912b09 | 2037 | return 0; |
8b372562 TZ |
2038 | } |
2039 | ||
38b78eb8 | 2040 | err = create_filter(call, filter_string, true, &filter); |
8b372562 | 2041 | |
75b8e982 SR |
2042 | /* |
2043 | * Always swap the call filter with the new filter | |
2044 | * even if there was an error. If there was an error | |
2045 | * in the filter, we disable the filter and show the error | |
2046 | * string | |
2047 | */ | |
38b78eb8 | 2048 | if (filter) { |
f306cc82 | 2049 | struct event_filter *tmp; |
38b78eb8 | 2050 | |
f306cc82 | 2051 | tmp = event_filter(file); |
38b78eb8 | 2052 | if (!err) |
f306cc82 | 2053 | event_set_filtered_flag(file); |
38b78eb8 | 2054 | else |
f306cc82 | 2055 | filter_disable(file); |
38b78eb8 | 2056 | |
f306cc82 | 2057 | event_set_filter(file, filter); |
38b78eb8 TH |
2058 | |
2059 | if (tmp) { | |
2060 | /* Make sure the call is done with the filter */ | |
2061 | synchronize_sched(); | |
2062 | __free_filter(tmp); | |
2063 | } | |
75b8e982 | 2064 | } |
8b372562 TZ |
2065 | |
2066 | return err; | |
2067 | } | |
2068 | ||
7967b3e0 | 2069 | int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, |
8b372562 TZ |
2070 | char *filter_string) |
2071 | { | |
ae63b31e | 2072 | struct event_subsystem *system = dir->subsystem; |
f306cc82 | 2073 | struct trace_array *tr = dir->tr; |
75b8e982 SR |
2074 | struct event_filter *filter; |
2075 | int err = 0; | |
8b372562 | 2076 | |
00e95830 | 2077 | mutex_lock(&event_mutex); |
8b372562 | 2078 | |
e9dbfae5 | 2079 | /* Make sure the system still has events */ |
ae63b31e | 2080 | if (!dir->nr_events) { |
e9dbfae5 SR |
2081 | err = -ENODEV; |
2082 | goto out_unlock; | |
2083 | } | |
2084 | ||
8b372562 | 2085 | if (!strcmp(strstrip(filter_string), "0")) { |
bb9ef1cb | 2086 | filter_free_subsystem_preds(dir, tr); |
8b372562 | 2087 | remove_filter_string(system->filter); |
75b8e982 SR |
2088 | filter = system->filter; |
2089 | system->filter = NULL; | |
2090 | /* Ensure all filters are no longer used */ | |
2091 | synchronize_sched(); | |
bb9ef1cb | 2092 | filter_free_subsystem_filters(dir, tr); |
75b8e982 | 2093 | __free_filter(filter); |
a66abe7f | 2094 | goto out_unlock; |
8b372562 TZ |
2095 | } |
2096 | ||
bb9ef1cb | 2097 | err = create_system_filter(dir, tr, filter_string, &filter); |
38b78eb8 TH |
2098 | if (filter) { |
2099 | /* | |
2100 | * No event actually uses the system filter | |
2101 | * we can free it without synchronize_sched(). | |
2102 | */ | |
2103 | __free_filter(system->filter); | |
2104 | system->filter = filter; | |
2105 | } | |
8cd995b6 | 2106 | out_unlock: |
00e95830 | 2107 | mutex_unlock(&event_mutex); |
8b372562 TZ |
2108 | |
2109 | return err; | |
2110 | } | |
7ce7e424 | 2111 | |
07b139c8 | 2112 | #ifdef CONFIG_PERF_EVENTS |
6fb2915d LZ |
2113 | |
2114 | void ftrace_profile_free_filter(struct perf_event *event) | |
2115 | { | |
2116 | struct event_filter *filter = event->filter; | |
2117 | ||
2118 | event->filter = NULL; | |
c9c53ca0 | 2119 | __free_filter(filter); |
6fb2915d LZ |
2120 | } |
2121 | ||
5500fa51 JO |
2122 | struct function_filter_data { |
2123 | struct ftrace_ops *ops; | |
2124 | int first_filter; | |
2125 | int first_notrace; | |
2126 | }; | |
2127 | ||
2128 | #ifdef CONFIG_FUNCTION_TRACER | |
2129 | static char ** | |
2130 | ftrace_function_filter_re(char *buf, int len, int *count) | |
2131 | { | |
1bb56471 | 2132 | char *str, **re; |
5500fa51 JO |
2133 | |
2134 | str = kstrndup(buf, len, GFP_KERNEL); | |
2135 | if (!str) | |
2136 | return NULL; | |
2137 | ||
2138 | /* | |
2139 | * The argv_split function takes white space | |
2140 | * as a separator, so convert ',' into spaces. | |
2141 | */ | |
1bb56471 | 2142 | strreplace(str, ',', ' '); |
5500fa51 JO |
2143 | |
2144 | re = argv_split(GFP_KERNEL, str, count); | |
2145 | kfree(str); | |
2146 | return re; | |
2147 | } | |
2148 | ||
2149 | static int ftrace_function_set_regexp(struct ftrace_ops *ops, int filter, | |
2150 | int reset, char *re, int len) | |
2151 | { | |
2152 | int ret; | |
2153 | ||
2154 | if (filter) | |
2155 | ret = ftrace_set_filter(ops, re, len, reset); | |
2156 | else | |
2157 | ret = ftrace_set_notrace(ops, re, len, reset); | |
2158 | ||
2159 | return ret; | |
2160 | } | |
2161 | ||
2162 | static int __ftrace_function_set_filter(int filter, char *buf, int len, | |
2163 | struct function_filter_data *data) | |
2164 | { | |
92d8d4a8 | 2165 | int i, re_cnt, ret = -EINVAL; |
5500fa51 JO |
2166 | int *reset; |
2167 | char **re; | |
2168 | ||
2169 | reset = filter ? &data->first_filter : &data->first_notrace; | |
2170 | ||
2171 | /* | |
2172 | * The 'ip' field could have multiple filters set, separated | |
2173 | * either by space or comma. We first cut the filter and apply | |
2174 | * all pieces separatelly. | |
2175 | */ | |
2176 | re = ftrace_function_filter_re(buf, len, &re_cnt); | |
2177 | if (!re) | |
2178 | return -EINVAL; | |
2179 | ||
2180 | for (i = 0; i < re_cnt; i++) { | |
2181 | ret = ftrace_function_set_regexp(data->ops, filter, *reset, | |
2182 | re[i], strlen(re[i])); | |
2183 | if (ret) | |
2184 | break; | |
2185 | ||
2186 | if (*reset) | |
2187 | *reset = 0; | |
2188 | } | |
2189 | ||
2190 | argv_free(re); | |
2191 | return ret; | |
2192 | } | |
2193 | ||
2194 | static int ftrace_function_check_pred(struct filter_pred *pred, int leaf) | |
2195 | { | |
2196 | struct ftrace_event_field *field = pred->field; | |
2197 | ||
2198 | if (leaf) { | |
2199 | /* | |
2200 | * Check the leaf predicate for function trace, verify: | |
2201 | * - only '==' and '!=' is used | |
2202 | * - the 'ip' field is used | |
2203 | */ | |
2204 | if ((pred->op != OP_EQ) && (pred->op != OP_NE)) | |
2205 | return -EINVAL; | |
2206 | ||
2207 | if (strcmp(field->name, "ip")) | |
2208 | return -EINVAL; | |
2209 | } else { | |
2210 | /* | |
2211 | * Check the non leaf predicate for function trace, verify: | |
2212 | * - only '||' is used | |
2213 | */ | |
2214 | if (pred->op != OP_OR) | |
2215 | return -EINVAL; | |
2216 | } | |
2217 | ||
2218 | return 0; | |
2219 | } | |
2220 | ||
2221 | static int ftrace_function_set_filter_cb(enum move_type move, | |
2222 | struct filter_pred *pred, | |
2223 | int *err, void *data) | |
2224 | { | |
2225 | /* Checking the node is valid for function trace. */ | |
2226 | if ((move != MOVE_DOWN) || | |
2227 | (pred->left != FILTER_PRED_INVALID)) { | |
2228 | *err = ftrace_function_check_pred(pred, 0); | |
2229 | } else { | |
2230 | *err = ftrace_function_check_pred(pred, 1); | |
2231 | if (*err) | |
2232 | return WALK_PRED_ABORT; | |
2233 | ||
2234 | *err = __ftrace_function_set_filter(pred->op == OP_EQ, | |
2235 | pred->regex.pattern, | |
2236 | pred->regex.len, | |
2237 | data); | |
2238 | } | |
2239 | ||
2240 | return (*err) ? WALK_PRED_ABORT : WALK_PRED_DEFAULT; | |
2241 | } | |
2242 | ||
2243 | static int ftrace_function_set_filter(struct perf_event *event, | |
2244 | struct event_filter *filter) | |
2245 | { | |
2246 | struct function_filter_data data = { | |
2247 | .first_filter = 1, | |
2248 | .first_notrace = 1, | |
2249 | .ops = &event->ftrace_ops, | |
2250 | }; | |
2251 | ||
2252 | return walk_pred_tree(filter->preds, filter->root, | |
2253 | ftrace_function_set_filter_cb, &data); | |
2254 | } | |
2255 | #else | |
2256 | static int ftrace_function_set_filter(struct perf_event *event, | |
2257 | struct event_filter *filter) | |
2258 | { | |
2259 | return -ENODEV; | |
2260 | } | |
2261 | #endif /* CONFIG_FUNCTION_TRACER */ | |
2262 | ||
6fb2915d LZ |
2263 | int ftrace_profile_set_filter(struct perf_event *event, int event_id, |
2264 | char *filter_str) | |
2265 | { | |
2266 | int err; | |
2267 | struct event_filter *filter; | |
2425bcb9 | 2268 | struct trace_event_call *call; |
6fb2915d LZ |
2269 | |
2270 | mutex_lock(&event_mutex); | |
2271 | ||
3f78f935 | 2272 | call = event->tp_event; |
a66abe7f IM |
2273 | |
2274 | err = -EINVAL; | |
3f78f935 | 2275 | if (!call) |
a66abe7f | 2276 | goto out_unlock; |
6fb2915d | 2277 | |
a66abe7f | 2278 | err = -EEXIST; |
6fb2915d | 2279 | if (event->filter) |
a66abe7f | 2280 | goto out_unlock; |
6fb2915d | 2281 | |
38b78eb8 | 2282 | err = create_filter(call, filter_str, false, &filter); |
5500fa51 JO |
2283 | if (err) |
2284 | goto free_filter; | |
2285 | ||
2286 | if (ftrace_event_is_function(call)) | |
2287 | err = ftrace_function_set_filter(event, filter); | |
38b78eb8 | 2288 | else |
5500fa51 JO |
2289 | event->filter = filter; |
2290 | ||
2291 | free_filter: | |
2292 | if (err || ftrace_event_is_function(call)) | |
c9c53ca0 | 2293 | __free_filter(filter); |
6fb2915d | 2294 | |
a66abe7f | 2295 | out_unlock: |
6fb2915d LZ |
2296 | mutex_unlock(&event_mutex); |
2297 | ||
2298 | return err; | |
2299 | } | |
2300 | ||
07b139c8 | 2301 | #endif /* CONFIG_PERF_EVENTS */ |
6fb2915d | 2302 | |
1d0e78e3 JO |
2303 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
2304 | ||
2305 | #include <linux/types.h> | |
2306 | #include <linux/tracepoint.h> | |
2307 | ||
2308 | #define CREATE_TRACE_POINTS | |
2309 | #include "trace_events_filter_test.h" | |
2310 | ||
1d0e78e3 JO |
2311 | #define DATA_REC(m, va, vb, vc, vd, ve, vf, vg, vh, nvisit) \ |
2312 | { \ | |
2313 | .filter = FILTER, \ | |
2314 | .rec = { .a = va, .b = vb, .c = vc, .d = vd, \ | |
2315 | .e = ve, .f = vf, .g = vg, .h = vh }, \ | |
2316 | .match = m, \ | |
2317 | .not_visited = nvisit, \ | |
2318 | } | |
2319 | #define YES 1 | |
2320 | #define NO 0 | |
2321 | ||
2322 | static struct test_filter_data_t { | |
2323 | char *filter; | |
a7237765 | 2324 | struct trace_event_raw_ftrace_test_filter rec; |
1d0e78e3 JO |
2325 | int match; |
2326 | char *not_visited; | |
2327 | } test_filter_data[] = { | |
2328 | #define FILTER "a == 1 && b == 1 && c == 1 && d == 1 && " \ | |
2329 | "e == 1 && f == 1 && g == 1 && h == 1" | |
2330 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, ""), | |
2331 | DATA_REC(NO, 0, 1, 1, 1, 1, 1, 1, 1, "bcdefgh"), | |
2332 | DATA_REC(NO, 1, 1, 1, 1, 1, 1, 1, 0, ""), | |
2333 | #undef FILTER | |
2334 | #define FILTER "a == 1 || b == 1 || c == 1 || d == 1 || " \ | |
2335 | "e == 1 || f == 1 || g == 1 || h == 1" | |
2336 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""), | |
2337 | DATA_REC(YES, 0, 0, 0, 0, 0, 0, 0, 1, ""), | |
2338 | DATA_REC(YES, 1, 0, 0, 0, 0, 0, 0, 0, "bcdefgh"), | |
2339 | #undef FILTER | |
2340 | #define FILTER "(a == 1 || b == 1) && (c == 1 || d == 1) && " \ | |
2341 | "(e == 1 || f == 1) && (g == 1 || h == 1)" | |
2342 | DATA_REC(NO, 0, 0, 1, 1, 1, 1, 1, 1, "dfh"), | |
2343 | DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""), | |
2344 | DATA_REC(YES, 1, 0, 1, 0, 0, 1, 0, 1, "bd"), | |
2345 | DATA_REC(NO, 1, 0, 1, 0, 0, 1, 0, 0, "bd"), | |
2346 | #undef FILTER | |
2347 | #define FILTER "(a == 1 && b == 1) || (c == 1 && d == 1) || " \ | |
2348 | "(e == 1 && f == 1) || (g == 1 && h == 1)" | |
2349 | DATA_REC(YES, 1, 0, 1, 1, 1, 1, 1, 1, "efgh"), | |
2350 | DATA_REC(YES, 0, 0, 0, 0, 0, 0, 1, 1, ""), | |
2351 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""), | |
2352 | #undef FILTER | |
2353 | #define FILTER "(a == 1 && b == 1) && (c == 1 && d == 1) && " \ | |
2354 | "(e == 1 && f == 1) || (g == 1 && h == 1)" | |
2355 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 0, "gh"), | |
2356 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""), | |
2357 | DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, ""), | |
2358 | #undef FILTER | |
2359 | #define FILTER "((a == 1 || b == 1) || (c == 1 || d == 1) || " \ | |
2360 | "(e == 1 || f == 1)) && (g == 1 || h == 1)" | |
2361 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 1, "bcdef"), | |
2362 | DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""), | |
2363 | DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, "h"), | |
2364 | #undef FILTER | |
2365 | #define FILTER "((((((((a == 1) && (b == 1)) || (c == 1)) && (d == 1)) || " \ | |
2366 | "(e == 1)) && (f == 1)) || (g == 1)) && (h == 1))" | |
2367 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "ceg"), | |
2368 | DATA_REC(NO, 0, 1, 0, 1, 0, 1, 0, 1, ""), | |
2369 | DATA_REC(NO, 1, 0, 1, 0, 1, 0, 1, 0, ""), | |
2370 | #undef FILTER | |
2371 | #define FILTER "((((((((a == 1) || (b == 1)) && (c == 1)) || (d == 1)) && " \ | |
2372 | "(e == 1)) || (f == 1)) && (g == 1)) || (h == 1))" | |
2373 | DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "bdfh"), | |
2374 | DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""), | |
2375 | DATA_REC(YES, 1, 0, 1, 0, 1, 0, 1, 0, "bdfh"), | |
2376 | }; | |
2377 | ||
2378 | #undef DATA_REC | |
2379 | #undef FILTER | |
2380 | #undef YES | |
2381 | #undef NO | |
2382 | ||
2383 | #define DATA_CNT (sizeof(test_filter_data)/sizeof(struct test_filter_data_t)) | |
2384 | ||
2385 | static int test_pred_visited; | |
2386 | ||
2387 | static int test_pred_visited_fn(struct filter_pred *pred, void *event) | |
2388 | { | |
2389 | struct ftrace_event_field *field = pred->field; | |
2390 | ||
2391 | test_pred_visited = 1; | |
2392 | printk(KERN_INFO "\npred visited %s\n", field->name); | |
2393 | return 1; | |
2394 | } | |
2395 | ||
2396 | static int test_walk_pred_cb(enum move_type move, struct filter_pred *pred, | |
2397 | int *err, void *data) | |
2398 | { | |
2399 | char *fields = data; | |
2400 | ||
2401 | if ((move == MOVE_DOWN) && | |
2402 | (pred->left == FILTER_PRED_INVALID)) { | |
2403 | struct ftrace_event_field *field = pred->field; | |
2404 | ||
2405 | if (!field) { | |
2406 | WARN(1, "all leafs should have field defined"); | |
2407 | return WALK_PRED_DEFAULT; | |
2408 | } | |
2409 | if (!strchr(fields, *field->name)) | |
2410 | return WALK_PRED_DEFAULT; | |
2411 | ||
2412 | WARN_ON(!pred->fn); | |
2413 | pred->fn = test_pred_visited_fn; | |
2414 | } | |
2415 | return WALK_PRED_DEFAULT; | |
2416 | } | |
2417 | ||
2418 | static __init int ftrace_test_event_filter(void) | |
2419 | { | |
2420 | int i; | |
2421 | ||
2422 | printk(KERN_INFO "Testing ftrace filter: "); | |
2423 | ||
2424 | for (i = 0; i < DATA_CNT; i++) { | |
2425 | struct event_filter *filter = NULL; | |
2426 | struct test_filter_data_t *d = &test_filter_data[i]; | |
2427 | int err; | |
2428 | ||
38b78eb8 TH |
2429 | err = create_filter(&event_ftrace_test_filter, d->filter, |
2430 | false, &filter); | |
1d0e78e3 JO |
2431 | if (err) { |
2432 | printk(KERN_INFO | |
2433 | "Failed to get filter for '%s', err %d\n", | |
2434 | d->filter, err); | |
38b78eb8 | 2435 | __free_filter(filter); |
1d0e78e3 JO |
2436 | break; |
2437 | } | |
2438 | ||
86b6ef21 SR |
2439 | /* |
2440 | * The preemption disabling is not really needed for self | |
2441 | * tests, but the rcu dereference will complain without it. | |
2442 | */ | |
2443 | preempt_disable(); | |
1d0e78e3 JO |
2444 | if (*d->not_visited) |
2445 | walk_pred_tree(filter->preds, filter->root, | |
2446 | test_walk_pred_cb, | |
2447 | d->not_visited); | |
2448 | ||
2449 | test_pred_visited = 0; | |
2450 | err = filter_match_preds(filter, &d->rec); | |
86b6ef21 | 2451 | preempt_enable(); |
1d0e78e3 JO |
2452 | |
2453 | __free_filter(filter); | |
2454 | ||
2455 | if (test_pred_visited) { | |
2456 | printk(KERN_INFO | |
2457 | "Failed, unwanted pred visited for filter %s\n", | |
2458 | d->filter); | |
2459 | break; | |
2460 | } | |
2461 | ||
2462 | if (err != d->match) { | |
2463 | printk(KERN_INFO | |
2464 | "Failed to match filter '%s', expected %d\n", | |
2465 | d->filter, d->match); | |
2466 | break; | |
2467 | } | |
2468 | } | |
2469 | ||
2470 | if (i == DATA_CNT) | |
2471 | printk(KERN_CONT "OK\n"); | |
2472 | ||
2473 | return 0; | |
2474 | } | |
2475 | ||
2476 | late_initcall(ftrace_test_event_filter); | |
2477 | ||
2478 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |