2 * trace_events_filter - generic event filtering
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.
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.
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.
18 * Copyright (C) 2009 Tom Zanussi <tzanussi@gmail.com>
21 #include <linux/module.h>
22 #include <linux/ctype.h>
23 #include <linux/mutex.h>
24 #include <linux/perf_event.h>
25 #include <linux/slab.h>
28 #include "trace_output.h"
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"
36 /* Due to token parsing '<=' must be before '<' and '>=' must be before '>' */
51 enum filter_op_ids { OPS };
56 static const char * ops[] = { OPS };
59 * pred functions are OP_LE, OP_LT, OP_GE, OP_GT, and OP_BAND
60 * pred_funcs_##type below must match the order of them above.
62 #define PRED_FUNC_START OP_LE
63 #define PRED_FUNC_MAX (OP_BAND - PRED_FUNC_START)
66 C(NONE, "No error"), \
67 C(INVALID_OP, "Invalid operator"), \
68 C(TOO_MANY_OPEN, "Too many '('"), \
69 C(TOO_MANY_CLOSE, "Too few '('"), \
70 C(MISSING_QUOTE, "Missing matching quote"), \
71 C(OPERAND_TOO_LONG, "Operand too long"), \
72 C(EXPECT_STRING, "Expecting string field"), \
73 C(EXPECT_DIGIT, "Expecting numeric field"), \
74 C(ILLEGAL_FIELD_OP, "Illegal operation for field type"), \
75 C(FIELD_NOT_FOUND, "Field not found"), \
76 C(ILLEGAL_INTVAL, "Illegal integer value"), \
77 C(BAD_SUBSYS_FILTER, "Couldn't find or set field in one of a subsystem's events"), \
78 C(TOO_MANY_PREDS, "Too many terms in predicate expression"), \
79 C(INVALID_FILTER, "Meaningless filter expression"), \
80 C(IP_FIELD_ONLY, "Only 'ip' field is supported for function trace"), \
81 C(INVALID_VALUE, "Invalid value (did you forget quotes)?"),
84 #define C(a, b) FILT_ERR_##a
91 static char *err_text[] = { ERRORS };
93 /* Called after a '!' character but "!=" and "!~" are not "not"s */
94 static bool is_not(const char *str)
105 * prog_entry - a singe entry in the filter program
106 * @target: Index to jump to on a branch (actually one minus the index)
107 * @when_to_branch: The value of the result of the predicate to do a branch
108 * @pred: The predicate to execute.
113 struct filter_pred *pred;
117 * update_preds- assign a program entry a label target
118 * @prog: The program array
119 * @N: The index of the current entry in @prog
120 * @when_to_branch: What to assign a program entry for its branch condition
122 * The program entry at @N has a target that points to the index of a program
123 * entry that can have its target and when_to_branch fields updated.
124 * Update the current program entry denoted by index @N target field to be
125 * that of the updated entry. This will denote the entry to update if
126 * we are processing an "||" after an "&&"
128 static void update_preds(struct prog_entry *prog, int N, int invert)
134 prog[t].when_to_branch = invert;
139 struct filter_parse_error {
144 static void parse_error(struct filter_parse_error *pe, int err, int pos)
147 pe->lasterr_pos = pos;
150 typedef int (*parse_pred_fn)(const char *str, void *data, int pos,
151 struct filter_parse_error *pe,
152 struct filter_pred **pred);
161 * Without going into a formal proof, this explains the method that is used in
162 * parsing the logical expressions.
164 * For example, if we have: "a && !(!b || (c && g)) || d || e && !f"
165 * The first pass will convert it into the following program:
167 * n1: r=a; l1: if (!r) goto l4;
168 * n2: r=b; l2: if (!r) goto l4;
169 * n3: r=c; r=!r; l3: if (r) goto l4;
170 * n4: r=g; r=!r; l4: if (r) goto l5;
171 * n5: r=d; l5: if (r) goto T
172 * n6: r=e; l6: if (!r) goto l7;
173 * n7: r=f; r=!r; l7: if (!r) goto F
177 * To do this, we use a data structure to represent each of the above
178 * predicate and conditions that has:
180 * predicate, when_to_branch, invert, target
182 * The "predicate" will hold the function to determine the result "r".
183 * The "when_to_branch" denotes what "r" should be if a branch is to be taken
184 * "&&" would contain "!r" or (0) and "||" would contain "r" or (1).
185 * The "invert" holds whether the value should be reversed before testing.
186 * The "target" contains the label "l#" to jump to.
188 * A stack is created to hold values when parentheses are used.
190 * To simplify the logic, the labels will start at 0 and not 1.
192 * The possible invert values are 1 and 0. The number of "!"s that are in scope
193 * before the predicate determines the invert value, if the number is odd then
194 * the invert value is 1 and 0 otherwise. This means the invert value only
195 * needs to be toggled when a new "!" is introduced compared to what is stored
196 * on the stack, where parentheses were used.
198 * The top of the stack and "invert" are initialized to zero.
202 * #1 A loop through all the tokens is done:
204 * #2 If the token is an "(", the stack is push, and the current stack value
205 * gets the current invert value, and the loop continues to the next token.
206 * The top of the stack saves the "invert" value to keep track of what
207 * the current inversion is. As "!(a && !b || c)" would require all
208 * predicates being affected separately by the "!" before the parentheses.
209 * And that would end up being equivalent to "(!a || b) && !c"
211 * #3 If the token is an "!", the current "invert" value gets inverted, and
212 * the loop continues. Note, if the next token is a predicate, then
213 * this "invert" value is only valid for the current program entry,
214 * and does not affect other predicates later on.
216 * The only other acceptable token is the predicate string.
218 * #4 A new entry into the program is added saving: the predicate and the
219 * current value of "invert". The target is currently assigned to the
220 * previous program index (this will not be its final value).
222 * #5 We now enter another loop and look at the next token. The only valid
223 * tokens are ")", "&&", "||" or end of the input string "\0".
225 * #6 The invert variable is reset to the current value saved on the top of
228 * #7 The top of the stack holds not only the current invert value, but also
229 * if a "&&" or "||" needs to be processed. Note, the "&&" takes higher
230 * precedence than "||". That is "a && b || c && d" is equivalent to
231 * "(a && b) || (c && d)". Thus the first thing to do is to see if "&&" needs
232 * to be processed. This is the case if an "&&" was the last token. If it was
233 * then we call update_preds(). This takes the program, the current index in
234 * the program, and the current value of "invert". More will be described
235 * below about this function.
237 * #8 If the next token is "&&" then we set a flag in the top of the stack
238 * that denotes that "&&" needs to be processed, break out of this loop
239 * and continue with the outer loop.
241 * #9 Otherwise, if a "||" needs to be processed then update_preds() is called.
242 * This is called with the program, the current index in the program, but
243 * this time with an inverted value of "invert" (that is !invert). This is
244 * because the value taken will become the "when_to_branch" value of the
246 * Note, this is called when the next token is not an "&&". As stated before,
247 * "&&" takes higher precedence, and "||" should not be processed yet if the
248 * next logical operation is "&&".
250 * #10 If the next token is "||" then we set a flag in the top of the stack
251 * that denotes that "||" needs to be processed, break out of this loop
252 * and continue with the outer loop.
254 * #11 If this is the end of the input string "\0" then we break out of both
257 * #12 Otherwise, the next token is ")", where we pop the stack and continue
260 * Now to discuss the update_pred() function, as that is key to the setting up
261 * of the program. Remember the "target" of the program is initialized to the
262 * previous index and not the "l" label. The target holds the index into the
263 * program that gets affected by the operand. Thus if we have something like
264 * "a || b && c", when we process "a" the target will be "-1" (undefined).
265 * When we process "b", its target is "0", which is the index of "a", as that's
266 * the predicate that is affected by "||". But because the next token after "b"
267 * is "&&" we don't call update_preds(). Instead continue to "c". As the
268 * next token after "c" is not "&&" but the end of input, we first process the
269 * "&&" by calling update_preds() for the "&&" then we process the "||" by
270 * callin updates_preds() with the values for processing "||".
272 * What does that mean? What update_preds() does is to first save the "target"
273 * of the program entry indexed by the current program entry's "target"
274 * (remember the "target" is initialized to previous program entry), and then
275 * sets that "target" to the current index which represents the label "l#".
276 * That entry's "when_to_branch" is set to the value passed in (the "invert"
277 * or "!invert"). Then it sets the current program entry's target to the saved
278 * "target" value (the old value of the program that had its "target" updated
281 * Looking back at "a || b && c", we have the following steps:
282 * "a" - prog[0] = { "a", X, -1 } // pred, when_to_branch, target
283 * "||" - flag that we need to process "||"; continue outer loop
284 * "b" - prog[1] = { "b", X, 0 }
285 * "&&" - flag that we need to process "&&"; continue outer loop
286 * (Notice we did not process "||")
287 * "c" - prog[2] = { "c", X, 1 }
288 * update_preds(prog, 2, 0); // invert = 0 as we are processing "&&"
289 * t = prog[2].target; // t = 1
290 * s = prog[t].target; // s = 0
291 * prog[t].target = 2; // Set target to "l2"
292 * prog[t].when_to_branch = 0;
293 * prog[2].target = s;
294 * update_preds(prog, 2, 1); // invert = 1 as we are now processing "||"
295 * t = prog[2].target; // t = 0
296 * s = prog[t].target; // s = -1
297 * prog[t].target = 2; // Set target to "l2"
298 * prog[t].when_to_branch = 1;
299 * prog[2].target = s;
301 * #13 Which brings us to the final step of the first pass, which is to set
302 * the last program entry's when_to_branch and target, which will be
303 * when_to_branch = 0; target = N; ( the label after the program entry after
304 * the last program entry processed above).
306 * If we denote "TRUE" to be the entry after the last program entry processed,
307 * and "FALSE" the program entry after that, we are now done with the first
310 * Making the above "a || b && c" have a progam of:
311 * prog[0] = { "a", 1, 2 }
312 * prog[1] = { "b", 0, 2 }
313 * prog[2] = { "c", 0, 3 }
315 * Which translates into:
316 * n0: r = a; l0: if (r) goto l2;
317 * n1: r = b; l1: if (!r) goto l2;
318 * n2: r = c; l2: if (!r) goto l3; // Which is the same as "goto F;"
319 * T: return TRUE; l3:
322 * Although, after the first pass, the program is correct, it is
323 * inefficient. The simple sample of "a || b && c" could be easily been
325 * n0: r = a; if (r) goto T
326 * n1: r = b; if (!r) goto F
327 * n2: r = c; if (!r) goto F
331 * The First Pass is over the input string. The next too passes are over
332 * the program itself.
336 * Which brings us to the second pass. If a jump to a label has the
337 * same condition as that label, it can instead jump to its target.
338 * The original example of "a && !(!b || (c && g)) || d || e && !f"
339 * where the first pass gives us:
341 * n1: r=a; l1: if (!r) goto l4;
342 * n2: r=b; l2: if (!r) goto l4;
343 * n3: r=c; r=!r; l3: if (r) goto l4;
344 * n4: r=g; r=!r; l4: if (r) goto l5;
345 * n5: r=d; l5: if (r) goto T
346 * n6: r=e; l6: if (!r) goto l7;
347 * n7: r=f; r=!r; l7: if (!r) goto F:
351 * We can see that "l3: if (r) goto l4;" and at l4, we have "if (r) goto l5;".
352 * And "l5: if (r) goto T", we could optimize this by converting l3 and l4
353 * to go directly to T. To accomplish this, we start from the last
354 * entry in the program and work our way back. If the target of the entry
355 * has the same "when_to_branch" then we could use that entry's target.
356 * Doing this, the above would end up as:
358 * n1: r=a; l1: if (!r) goto l4;
359 * n2: r=b; l2: if (!r) goto l4;
360 * n3: r=c; r=!r; l3: if (r) goto T;
361 * n4: r=g; r=!r; l4: if (r) goto T;
362 * n5: r=d; l5: if (r) goto T;
363 * n6: r=e; l6: if (!r) goto F;
364 * n7: r=f; r=!r; l7: if (!r) goto F;
368 * In that same pass, if the "when_to_branch" doesn't match, we can simply
369 * go to the program entry after the label. That is, "l2: if (!r) goto l4;"
370 * where "l4: if (r) goto T;", then we can convert l2 to be:
371 * "l2: if (!r) goto n5;".
373 * This will have the second pass give us:
374 * n1: r=a; l1: if (!r) goto n5;
375 * n2: r=b; l2: if (!r) goto n5;
376 * n3: r=c; r=!r; l3: if (r) goto T;
377 * n4: r=g; r=!r; l4: if (r) goto T;
378 * n5: r=d; l5: if (r) goto T
379 * n6: r=e; l6: if (!r) goto F;
380 * n7: r=f; r=!r; l7: if (!r) goto F
384 * Notice, all the "l#" labels are no longer used, and they can now
389 * For the third pass we deal with the inverts. As they simply just
390 * make the "when_to_branch" get inverted, a simple loop over the
391 * program to that does: "when_to_branch ^= invert;" will do the
392 * job, leaving us with:
393 * n1: r=a; if (!r) goto n5;
394 * n2: r=b; if (!r) goto n5;
395 * n3: r=c: if (!r) goto T;
396 * n4: r=g; if (!r) goto T;
397 * n5: r=d; if (r) goto T
398 * n6: r=e; if (!r) goto F;
399 * n7: r=f; if (r) goto F
403 * As "r = a; if (!r) goto n5;" is obviously the same as
404 * "if (!a) goto n5;" without doing anything we can interperate the
406 * n1: if (!a) goto n5;
407 * n2: if (!b) goto n5;
408 * n3: if (!c) goto T;
409 * n4: if (!g) goto T;
411 * n6: if (!e) goto F;
416 * Since the inverts are discarded at the end, there's no reason to store
417 * them in the program array (and waste memory). A separate array to hold
418 * the inverts is used and freed at the end.
420 static struct prog_entry *
421 predicate_parse(const char *str, int nr_parens, int nr_preds,
422 parse_pred_fn parse_pred, void *data,
423 struct filter_parse_error *pe)
425 struct prog_entry *prog_stack;
426 struct prog_entry *prog;
427 const char *ptr = str;
428 char *inverts = NULL;
437 nr_preds += 2; /* For TRUE and FALSE */
439 op_stack = kmalloc_array(nr_parens, sizeof(*op_stack), GFP_KERNEL);
441 return ERR_PTR(-ENOMEM);
442 prog_stack = kmalloc_array(nr_preds, sizeof(*prog_stack), GFP_KERNEL);
444 parse_error(pe, -ENOMEM, 0);
447 inverts = kmalloc_array(nr_preds, sizeof(*inverts), GFP_KERNEL);
449 parse_error(pe, -ENOMEM, 0);
458 while (*ptr) { /* #1 */
459 const char *next = ptr++;
466 if (top - op_stack > nr_parens)
467 return ERR_PTR(-EINVAL);
478 parse_error(pe, FILT_ERR_TOO_MANY_PREDS, next - str);
482 inverts[N] = invert; /* #4 */
483 prog[N].target = N-1;
485 len = parse_pred(next, data, ptr - str, pe, &prog[N].pred);
506 if (next[1] == next[0]) {
511 parse_error(pe, FILT_ERR_TOO_MANY_PREDS,
516 invert = *top & INVERT;
518 if (*top & PROCESS_AND) { /* #7 */
519 update_preds(prog, N - 1, invert);
520 *top &= ~PROCESS_AND;
522 if (*next == '&') { /* #8 */
526 if (*top & PROCESS_OR) { /* #9 */
527 update_preds(prog, N - 1, !invert);
530 if (*next == '|') { /* #10 */
534 if (!*next) /* #11 */
537 if (top == op_stack) {
540 parse_error(pe, FILT_ERR_TOO_MANY_CLOSE, ptr - str);
547 if (top != op_stack) {
549 parse_error(pe, FILT_ERR_TOO_MANY_OPEN, ptr - str);
553 prog[N].pred = NULL; /* #13 */
554 prog[N].target = 1; /* TRUE */
555 prog[N+1].pred = NULL;
556 prog[N+1].target = 0; /* FALSE */
557 prog[N-1].target = N;
558 prog[N-1].when_to_branch = false;
561 for (i = N-1 ; i--; ) {
562 int target = prog[i].target;
563 if (prog[i].when_to_branch == prog[target].when_to_branch)
564 prog[i].target = prog[target].target;
568 for (i = 0; i < N; i++) {
569 invert = inverts[i] ^ prog[i].when_to_branch;
570 prog[i].when_to_branch = invert;
571 /* Make sure the program always moves forward */
572 if (WARN_ON(prog[i].target <= i)) {
586 #define DEFINE_COMPARISON_PRED(type) \
587 static int filter_pred_LT_##type(struct filter_pred *pred, void *event) \
589 type *addr = (type *)(event + pred->offset); \
590 type val = (type)pred->val; \
591 return *addr < val; \
593 static int filter_pred_LE_##type(struct filter_pred *pred, void *event) \
595 type *addr = (type *)(event + pred->offset); \
596 type val = (type)pred->val; \
597 return *addr <= val; \
599 static int filter_pred_GT_##type(struct filter_pred *pred, void *event) \
601 type *addr = (type *)(event + pred->offset); \
602 type val = (type)pred->val; \
603 return *addr > val; \
605 static int filter_pred_GE_##type(struct filter_pred *pred, void *event) \
607 type *addr = (type *)(event + pred->offset); \
608 type val = (type)pred->val; \
609 return *addr >= val; \
611 static int filter_pred_BAND_##type(struct filter_pred *pred, void *event) \
613 type *addr = (type *)(event + pred->offset); \
614 type val = (type)pred->val; \
615 return !!(*addr & val); \
617 static const filter_pred_fn_t pred_funcs_##type[] = { \
618 filter_pred_LE_##type, \
619 filter_pred_LT_##type, \
620 filter_pred_GE_##type, \
621 filter_pred_GT_##type, \
622 filter_pred_BAND_##type, \
625 #define DEFINE_EQUALITY_PRED(size) \
626 static int filter_pred_##size(struct filter_pred *pred, void *event) \
628 u##size *addr = (u##size *)(event + pred->offset); \
629 u##size val = (u##size)pred->val; \
632 match = (val == *addr) ^ pred->not; \
637 DEFINE_COMPARISON_PRED(s64);
638 DEFINE_COMPARISON_PRED(u64);
639 DEFINE_COMPARISON_PRED(s32);
640 DEFINE_COMPARISON_PRED(u32);
641 DEFINE_COMPARISON_PRED(s16);
642 DEFINE_COMPARISON_PRED(u16);
643 DEFINE_COMPARISON_PRED(s8);
644 DEFINE_COMPARISON_PRED(u8);
646 DEFINE_EQUALITY_PRED(64);
647 DEFINE_EQUALITY_PRED(32);
648 DEFINE_EQUALITY_PRED(16);
649 DEFINE_EQUALITY_PRED(8);
651 /* Filter predicate for fixed sized arrays of characters */
652 static int filter_pred_string(struct filter_pred *pred, void *event)
654 char *addr = (char *)(event + pred->offset);
657 cmp = pred->regex.match(addr, &pred->regex, pred->regex.field_len);
659 match = cmp ^ pred->not;
664 /* Filter predicate for char * pointers */
665 static int filter_pred_pchar(struct filter_pred *pred, void *event)
667 char **addr = (char **)(event + pred->offset);
669 int len = strlen(*addr) + 1; /* including tailing '\0' */
671 cmp = pred->regex.match(*addr, &pred->regex, len);
673 match = cmp ^ pred->not;
679 * Filter predicate for dynamic sized arrays of characters.
680 * These are implemented through a list of strings at the end
682 * Also each of these strings have a field in the entry which
683 * contains its offset from the beginning of the entry.
684 * We have then first to get this field, dereference it
685 * and add it to the address of the entry, and at last we have
686 * the address of the string.
688 static int filter_pred_strloc(struct filter_pred *pred, void *event)
690 u32 str_item = *(u32 *)(event + pred->offset);
691 int str_loc = str_item & 0xffff;
692 int str_len = str_item >> 16;
693 char *addr = (char *)(event + str_loc);
696 cmp = pred->regex.match(addr, &pred->regex, str_len);
698 match = cmp ^ pred->not;
703 /* Filter predicate for CPUs. */
704 static int filter_pred_cpu(struct filter_pred *pred, void *event)
708 cpu = raw_smp_processor_id();
729 /* Filter predicate for COMM. */
730 static int filter_pred_comm(struct filter_pred *pred, void *event)
734 cmp = pred->regex.match(current->comm, &pred->regex,
736 return cmp ^ pred->not;
739 static int filter_pred_none(struct filter_pred *pred, void *event)
745 * regex_match_foo - Basic regex callbacks
747 * @str: the string to be searched
748 * @r: the regex structure containing the pattern string
749 * @len: the length of the string to be searched (including '\0')
752 * - @str might not be NULL-terminated if it's of type DYN_STRING
753 * or STATIC_STRING, unless @len is zero.
756 static int regex_match_full(char *str, struct regex *r, int len)
758 /* len of zero means str is dynamic and ends with '\0' */
760 return strcmp(str, r->pattern) == 0;
762 return strncmp(str, r->pattern, len) == 0;
765 static int regex_match_front(char *str, struct regex *r, int len)
767 if (len && len < r->len)
770 return strncmp(str, r->pattern, r->len) == 0;
773 static int regex_match_middle(char *str, struct regex *r, int len)
776 return strstr(str, r->pattern) != NULL;
778 return strnstr(str, r->pattern, len) != NULL;
781 static int regex_match_end(char *str, struct regex *r, int len)
783 int strlen = len - 1;
785 if (strlen >= r->len &&
786 memcmp(str + strlen - r->len, r->pattern, r->len) == 0)
791 static int regex_match_glob(char *str, struct regex *r, int len __maybe_unused)
793 if (glob_match(r->pattern, str))
799 * filter_parse_regex - parse a basic regex
800 * @buff: the raw regex
801 * @len: length of the regex
802 * @search: will point to the beginning of the string to compare
803 * @not: tell whether the match will have to be inverted
805 * This passes in a buffer containing a regex and this function will
806 * set search to point to the search part of the buffer and
807 * return the type of search it is (see enum above).
808 * This does modify buff.
811 * search returns the pointer to use for comparison.
812 * not returns 1 if buff started with a '!'
815 enum regex_type filter_parse_regex(char *buff, int len, char **search, int *not)
817 int type = MATCH_FULL;
820 if (buff[0] == '!') {
829 for (i = 0; i < len; i++) {
830 if (buff[i] == '*') {
832 type = MATCH_END_ONLY;
833 } else if (i == len - 1) {
834 if (type == MATCH_END_ONLY)
835 type = MATCH_MIDDLE_ONLY;
837 type = MATCH_FRONT_ONLY;
840 } else { /* pattern continues, use full glob */
843 } else if (strchr("[?\\", buff[i])) {
853 static void filter_build_regex(struct filter_pred *pred)
855 struct regex *r = &pred->regex;
857 enum regex_type type = MATCH_FULL;
859 if (pred->op == OP_GLOB) {
860 type = filter_parse_regex(r->pattern, r->len, &search, &pred->not);
861 r->len = strlen(search);
862 memmove(r->pattern, search, r->len+1);
867 r->match = regex_match_full;
869 case MATCH_FRONT_ONLY:
870 r->match = regex_match_front;
872 case MATCH_MIDDLE_ONLY:
873 r->match = regex_match_middle;
876 r->match = regex_match_end;
879 r->match = regex_match_glob;
884 /* return 1 if event matches, 0 otherwise (discard) */
885 int filter_match_preds(struct event_filter *filter, void *rec)
887 struct prog_entry *prog;
890 /* no filter is considered a match */
894 prog = rcu_dereference_sched(filter->prog);
898 for (i = 0; prog[i].pred; i++) {
899 struct filter_pred *pred = prog[i].pred;
900 int match = pred->fn(pred, rec);
901 if (match == prog[i].when_to_branch)
904 return prog[i].target;
906 EXPORT_SYMBOL_GPL(filter_match_preds);
908 static void remove_filter_string(struct event_filter *filter)
913 kfree(filter->filter_string);
914 filter->filter_string = NULL;
917 static void append_filter_err(struct filter_parse_error *pe,
918 struct event_filter *filter)
921 int pos = pe->lasterr_pos;
925 if (WARN_ON(!filter->filter_string))
928 s = kmalloc(sizeof(*s), GFP_KERNEL);
933 len = strlen(filter->filter_string);
937 /* indexing is off by one */
941 trace_seq_puts(s, filter->filter_string);
942 if (pe->lasterr > 0) {
943 trace_seq_printf(s, "\n%*s", pos, "^");
944 trace_seq_printf(s, "\nparse_error: %s\n", err_text[pe->lasterr]);
946 trace_seq_printf(s, "\nError: (%d)\n", pe->lasterr);
948 trace_seq_putc(s, 0);
949 buf = kmemdup_nul(s->buffer, s->seq.len, GFP_KERNEL);
951 kfree(filter->filter_string);
952 filter->filter_string = buf;
957 static inline struct event_filter *event_filter(struct trace_event_file *file)
962 /* caller must hold event_mutex */
963 void print_event_filter(struct trace_event_file *file, struct trace_seq *s)
965 struct event_filter *filter = event_filter(file);
967 if (filter && filter->filter_string)
968 trace_seq_printf(s, "%s\n", filter->filter_string);
970 trace_seq_puts(s, "none\n");
973 void print_subsystem_event_filter(struct event_subsystem *system,
976 struct event_filter *filter;
978 mutex_lock(&event_mutex);
979 filter = system->filter;
980 if (filter && filter->filter_string)
981 trace_seq_printf(s, "%s\n", filter->filter_string);
983 trace_seq_puts(s, DEFAULT_SYS_FILTER_MESSAGE "\n");
984 mutex_unlock(&event_mutex);
987 static void free_prog(struct event_filter *filter)
989 struct prog_entry *prog;
992 prog = rcu_access_pointer(filter->prog);
996 for (i = 0; prog[i].pred; i++)
1001 static void filter_disable(struct trace_event_file *file)
1003 unsigned long old_flags = file->flags;
1005 file->flags &= ~EVENT_FILE_FL_FILTERED;
1007 if (old_flags != file->flags)
1008 trace_buffered_event_disable();
1011 static void __free_filter(struct event_filter *filter)
1017 kfree(filter->filter_string);
1021 void free_event_filter(struct event_filter *filter)
1023 __free_filter(filter);
1026 static inline void __remove_filter(struct trace_event_file *file)
1028 filter_disable(file);
1029 remove_filter_string(file->filter);
1032 static void filter_free_subsystem_preds(struct trace_subsystem_dir *dir,
1033 struct trace_array *tr)
1035 struct trace_event_file *file;
1037 list_for_each_entry(file, &tr->events, list) {
1038 if (file->system != dir)
1040 __remove_filter(file);
1044 static inline void __free_subsystem_filter(struct trace_event_file *file)
1046 __free_filter(file->filter);
1047 file->filter = NULL;
1050 static void filter_free_subsystem_filters(struct trace_subsystem_dir *dir,
1051 struct trace_array *tr)
1053 struct trace_event_file *file;
1055 list_for_each_entry(file, &tr->events, list) {
1056 if (file->system != dir)
1058 __free_subsystem_filter(file);
1062 int filter_assign_type(const char *type)
1064 if (strstr(type, "__data_loc") && strstr(type, "char"))
1065 return FILTER_DYN_STRING;
1067 if (strchr(type, '[') && strstr(type, "char"))
1068 return FILTER_STATIC_STRING;
1070 return FILTER_OTHER;
1073 static filter_pred_fn_t select_comparison_fn(enum filter_op_ids op,
1074 int field_size, int field_is_signed)
1076 filter_pred_fn_t fn = NULL;
1077 int pred_func_index = -1;
1084 if (WARN_ON_ONCE(op < PRED_FUNC_START))
1086 pred_func_index = op - PRED_FUNC_START;
1087 if (WARN_ON_ONCE(pred_func_index > PRED_FUNC_MAX))
1091 switch (field_size) {
1093 if (pred_func_index < 0)
1094 fn = filter_pred_64;
1095 else if (field_is_signed)
1096 fn = pred_funcs_s64[pred_func_index];
1098 fn = pred_funcs_u64[pred_func_index];
1101 if (pred_func_index < 0)
1102 fn = filter_pred_32;
1103 else if (field_is_signed)
1104 fn = pred_funcs_s32[pred_func_index];
1106 fn = pred_funcs_u32[pred_func_index];
1109 if (pred_func_index < 0)
1110 fn = filter_pred_16;
1111 else if (field_is_signed)
1112 fn = pred_funcs_s16[pred_func_index];
1114 fn = pred_funcs_u16[pred_func_index];
1117 if (pred_func_index < 0)
1119 else if (field_is_signed)
1120 fn = pred_funcs_s8[pred_func_index];
1122 fn = pred_funcs_u8[pred_func_index];
1129 /* Called when a predicate is encountered by predicate_parse() */
1130 static int parse_pred(const char *str, void *data,
1131 int pos, struct filter_parse_error *pe,
1132 struct filter_pred **pred_ptr)
1134 struct trace_event_call *call = data;
1135 struct ftrace_event_field *field;
1136 struct filter_pred *pred = NULL;
1137 char num_buf[24]; /* Big enough to hold an address */
1147 /* First find the field to associate to */
1148 while (isspace(str[i]))
1152 while (isalnum(str[i]) || str[i] == '_')
1160 field_name = kmemdup_nul(str + s, len, GFP_KERNEL);
1164 /* Make sure that the field exists */
1166 field = trace_find_event_field(call, field_name);
1169 parse_error(pe, FILT_ERR_FIELD_NOT_FOUND, pos + i);
1173 while (isspace(str[i]))
1176 /* Make sure this op is supported */
1177 for (op = 0; ops[op]; op++) {
1178 /* This is why '<=' must come before '<' in ops[] */
1179 if (strncmp(str + i, ops[op], strlen(ops[op])) == 0)
1184 parse_error(pe, FILT_ERR_INVALID_OP, pos + i);
1188 i += strlen(ops[op]);
1190 while (isspace(str[i]))
1195 pred = kzalloc(sizeof(*pred), GFP_KERNEL);
1199 pred->field = field;
1200 pred->offset = field->offset;
1203 if (ftrace_event_is_function(call)) {
1205 * Perf does things different with function events.
1206 * It only allows an "ip" field, and expects a string.
1207 * But the string does not need to be surrounded by quotes.
1208 * If it is a string, the assigned function as a nop,
1209 * (perf doesn't use it) and grab everything.
1211 if (strcmp(field->name, "ip") != 0) {
1212 parse_error(pe, FILT_ERR_IP_FIELD_ONLY, pos + i);
1215 pred->fn = filter_pred_none;
1218 * Quotes are not required, but if they exist then we need
1219 * to read them till we hit a matching one.
1221 if (str[i] == '\'' || str[i] == '"')
1226 for (i++; str[i]; i++) {
1227 if (q && str[i] == q)
1229 if (!q && (str[i] == ')' || str[i] == '&' ||
1237 if (len >= MAX_FILTER_STR_VAL) {
1238 parse_error(pe, FILT_ERR_OPERAND_TOO_LONG, pos + i);
1242 pred->regex.len = len;
1243 strncpy(pred->regex.pattern, str + s, len);
1244 pred->regex.pattern[len] = 0;
1246 /* This is either a string, or an integer */
1247 } else if (str[i] == '\'' || str[i] == '"') {
1250 /* Make sure the op is OK for strings */
1259 parse_error(pe, FILT_ERR_ILLEGAL_FIELD_OP, pos + i);
1263 /* Make sure the field is OK for strings */
1264 if (!is_string_field(field)) {
1265 parse_error(pe, FILT_ERR_EXPECT_DIGIT, pos + i);
1269 for (i++; str[i]; i++) {
1274 parse_error(pe, FILT_ERR_MISSING_QUOTE, pos + i);
1281 if (len >= MAX_FILTER_STR_VAL) {
1282 parse_error(pe, FILT_ERR_OPERAND_TOO_LONG, pos + i);
1286 pred->regex.len = len;
1287 strncpy(pred->regex.pattern, str + s, len);
1288 pred->regex.pattern[len] = 0;
1290 filter_build_regex(pred);
1292 if (field->filter_type == FILTER_COMM) {
1293 pred->fn = filter_pred_comm;
1295 } else if (field->filter_type == FILTER_STATIC_STRING) {
1296 pred->fn = filter_pred_string;
1297 pred->regex.field_len = field->size;
1299 } else if (field->filter_type == FILTER_DYN_STRING)
1300 pred->fn = filter_pred_strloc;
1302 pred->fn = filter_pred_pchar;
1303 /* go past the last quote */
1306 } else if (isdigit(str[i])) {
1308 /* Make sure the field is not a string */
1309 if (is_string_field(field)) {
1310 parse_error(pe, FILT_ERR_EXPECT_STRING, pos + i);
1314 if (op == OP_GLOB) {
1315 parse_error(pe, FILT_ERR_ILLEGAL_FIELD_OP, pos + i);
1319 /* We allow 0xDEADBEEF */
1320 while (isalnum(str[i]))
1324 /* 0xfeedfacedeadbeef is 18 chars max */
1325 if (len >= sizeof(num_buf)) {
1326 parse_error(pe, FILT_ERR_OPERAND_TOO_LONG, pos + i);
1330 strncpy(num_buf, str + s, len);
1333 /* Make sure it is a value */
1334 if (field->is_signed)
1335 ret = kstrtoll(num_buf, 0, &val);
1337 ret = kstrtoull(num_buf, 0, &val);
1339 parse_error(pe, FILT_ERR_ILLEGAL_INTVAL, pos + s);
1345 if (field->filter_type == FILTER_CPU)
1346 pred->fn = filter_pred_cpu;
1348 pred->fn = select_comparison_fn(pred->op, field->size,
1350 if (pred->op == OP_NE)
1355 parse_error(pe, FILT_ERR_INVALID_VALUE, pos + i);
1368 TOO_MANY_CLOSE = -1,
1374 * Read the filter string once to calculate the number of predicates
1375 * as well as how deep the parentheses go.
1378 * 0 - everything is fine (err is undefined)
1381 * -3 - No matching quote
1383 static int calc_stack(const char *str, int *parens, int *preds, int *err)
1385 bool is_pred = false;
1387 int open = 1; /* Count the expression as "(E)" */
1395 for (i = 0; str[i]; i++) {
1396 if (isspace(str[i]))
1399 if (str[i] == quote)
1412 if (str[i+1] != str[i])
1419 if (open > max_open)
1426 return TOO_MANY_CLOSE;
1439 return MISSING_QUOTE;
1445 /* find the bad open */
1448 if (str[i] == quote)
1454 if (level == open) {
1456 return TOO_MANY_OPEN;
1469 /* First character is the '(' with missing ')' */
1471 return TOO_MANY_OPEN;
1474 /* Set the size of the required stacks */
1480 static int process_preds(struct trace_event_call *call,
1481 const char *filter_string,
1482 struct event_filter *filter,
1483 struct filter_parse_error *pe)
1485 struct prog_entry *prog;
1491 ret = calc_stack(filter_string, &nr_parens, &nr_preds, &index);
1495 parse_error(pe, FILT_ERR_MISSING_QUOTE, index);
1498 parse_error(pe, FILT_ERR_TOO_MANY_OPEN, index);
1501 parse_error(pe, FILT_ERR_TOO_MANY_CLOSE, index);
1509 prog = predicate_parse(filter_string, nr_parens, nr_preds,
1510 parse_pred, call, pe);
1512 return PTR_ERR(prog);
1514 rcu_assign_pointer(filter->prog, prog);
1518 static inline void event_set_filtered_flag(struct trace_event_file *file)
1520 unsigned long old_flags = file->flags;
1522 file->flags |= EVENT_FILE_FL_FILTERED;
1524 if (old_flags != file->flags)
1525 trace_buffered_event_enable();
1528 static inline void event_set_filter(struct trace_event_file *file,
1529 struct event_filter *filter)
1531 rcu_assign_pointer(file->filter, filter);
1534 static inline void event_clear_filter(struct trace_event_file *file)
1536 RCU_INIT_POINTER(file->filter, NULL);
1540 event_set_no_set_filter_flag(struct trace_event_file *file)
1542 file->flags |= EVENT_FILE_FL_NO_SET_FILTER;
1546 event_clear_no_set_filter_flag(struct trace_event_file *file)
1548 file->flags &= ~EVENT_FILE_FL_NO_SET_FILTER;
1552 event_no_set_filter_flag(struct trace_event_file *file)
1554 if (file->flags & EVENT_FILE_FL_NO_SET_FILTER)
1560 struct filter_list {
1561 struct list_head list;
1562 struct event_filter *filter;
1565 static int process_system_preds(struct trace_subsystem_dir *dir,
1566 struct trace_array *tr,
1567 struct filter_parse_error *pe,
1568 char *filter_string)
1570 struct trace_event_file *file;
1571 struct filter_list *filter_item;
1572 struct event_filter *filter = NULL;
1573 struct filter_list *tmp;
1574 LIST_HEAD(filter_list);
1578 list_for_each_entry(file, &tr->events, list) {
1580 if (file->system != dir)
1583 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
1587 filter->filter_string = kstrdup(filter_string, GFP_KERNEL);
1588 if (!filter->filter_string)
1591 err = process_preds(file->event_call, filter_string, filter, pe);
1593 filter_disable(file);
1594 parse_error(pe, FILT_ERR_BAD_SUBSYS_FILTER, 0);
1595 append_filter_err(pe, filter);
1597 event_set_filtered_flag(file);
1600 filter_item = kzalloc(sizeof(*filter_item), GFP_KERNEL);
1604 list_add_tail(&filter_item->list, &filter_list);
1606 * Regardless of if this returned an error, we still
1607 * replace the filter for the call.
1609 filter_item->filter = event_filter(file);
1610 event_set_filter(file, filter);
1620 * The calls can still be using the old filters.
1621 * Do a synchronize_sched() to ensure all calls are
1622 * done with them before we free them.
1624 synchronize_sched();
1625 list_for_each_entry_safe(filter_item, tmp, &filter_list, list) {
1626 __free_filter(filter_item->filter);
1627 list_del(&filter_item->list);
1632 /* No call succeeded */
1633 list_for_each_entry_safe(filter_item, tmp, &filter_list, list) {
1634 list_del(&filter_item->list);
1637 parse_error(pe, FILT_ERR_BAD_SUBSYS_FILTER, 0);
1641 /* If any call succeeded, we still need to sync */
1643 synchronize_sched();
1644 list_for_each_entry_safe(filter_item, tmp, &filter_list, list) {
1645 __free_filter(filter_item->filter);
1646 list_del(&filter_item->list);
1652 static int create_filter_start(char *filter_string, bool set_str,
1653 struct filter_parse_error **pse,
1654 struct event_filter **filterp)
1656 struct event_filter *filter;
1657 struct filter_parse_error *pe = NULL;
1660 if (WARN_ON_ONCE(*pse || *filterp))
1663 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
1664 if (filter && set_str) {
1665 filter->filter_string = kstrdup(filter_string, GFP_KERNEL);
1666 if (!filter->filter_string)
1670 pe = kzalloc(sizeof(*pe), GFP_KERNEL);
1672 if (!filter || !pe || err) {
1674 __free_filter(filter);
1678 /* we're committed to creating a new filter */
1685 static void create_filter_finish(struct filter_parse_error *pe)
1691 * create_filter - create a filter for a trace_event_call
1692 * @call: trace_event_call to create a filter for
1693 * @filter_str: filter string
1694 * @set_str: remember @filter_str and enable detailed error in filter
1695 * @filterp: out param for created filter (always updated on return)
1697 * Creates a filter for @call with @filter_str. If @set_str is %true,
1698 * @filter_str is copied and recorded in the new filter.
1700 * On success, returns 0 and *@filterp points to the new filter. On
1701 * failure, returns -errno and *@filterp may point to %NULL or to a new
1702 * filter. In the latter case, the returned filter contains error
1703 * information if @set_str is %true and the caller is responsible for
1706 static int create_filter(struct trace_event_call *call,
1707 char *filter_string, bool set_str,
1708 struct event_filter **filterp)
1710 struct filter_parse_error *pe = NULL;
1713 err = create_filter_start(filter_string, set_str, &pe, filterp);
1717 err = process_preds(call, filter_string, *filterp, pe);
1719 append_filter_err(pe, *filterp);
1724 int create_event_filter(struct trace_event_call *call,
1725 char *filter_str, bool set_str,
1726 struct event_filter **filterp)
1728 return create_filter(call, filter_str, set_str, filterp);
1732 * create_system_filter - create a filter for an event_subsystem
1733 * @system: event_subsystem to create a filter for
1734 * @filter_str: filter string
1735 * @filterp: out param for created filter (always updated on return)
1737 * Identical to create_filter() except that it creates a subsystem filter
1738 * and always remembers @filter_str.
1740 static int create_system_filter(struct trace_subsystem_dir *dir,
1741 struct trace_array *tr,
1742 char *filter_str, struct event_filter **filterp)
1744 struct filter_parse_error *pe = NULL;
1747 err = create_filter_start(filter_str, true, &pe, filterp);
1749 err = process_system_preds(dir, tr, pe, filter_str);
1751 /* System filters just show a default message */
1752 kfree((*filterp)->filter_string);
1753 (*filterp)->filter_string = NULL;
1755 append_filter_err(pe, *filterp);
1758 create_filter_finish(pe);
1763 /* caller must hold event_mutex */
1764 int apply_event_filter(struct trace_event_file *file, char *filter_string)
1766 struct trace_event_call *call = file->event_call;
1767 struct event_filter *filter = NULL;
1770 if (!strcmp(strstrip(filter_string), "0")) {
1771 filter_disable(file);
1772 filter = event_filter(file);
1777 event_clear_filter(file);
1779 /* Make sure the filter is not being used */
1780 synchronize_sched();
1781 __free_filter(filter);
1786 err = create_filter(call, filter_string, true, &filter);
1789 * Always swap the call filter with the new filter
1790 * even if there was an error. If there was an error
1791 * in the filter, we disable the filter and show the error
1795 struct event_filter *tmp;
1797 tmp = event_filter(file);
1799 event_set_filtered_flag(file);
1801 filter_disable(file);
1803 event_set_filter(file, filter);
1806 /* Make sure the call is done with the filter */
1807 synchronize_sched();
1815 int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1816 char *filter_string)
1818 struct event_subsystem *system = dir->subsystem;
1819 struct trace_array *tr = dir->tr;
1820 struct event_filter *filter = NULL;
1823 mutex_lock(&event_mutex);
1825 /* Make sure the system still has events */
1826 if (!dir->nr_events) {
1831 if (!strcmp(strstrip(filter_string), "0")) {
1832 filter_free_subsystem_preds(dir, tr);
1833 remove_filter_string(system->filter);
1834 filter = system->filter;
1835 system->filter = NULL;
1836 /* Ensure all filters are no longer used */
1837 synchronize_sched();
1838 filter_free_subsystem_filters(dir, tr);
1839 __free_filter(filter);
1843 err = create_system_filter(dir, tr, filter_string, &filter);
1846 * No event actually uses the system filter
1847 * we can free it without synchronize_sched().
1849 __free_filter(system->filter);
1850 system->filter = filter;
1853 mutex_unlock(&event_mutex);
1858 #ifdef CONFIG_PERF_EVENTS
1860 void ftrace_profile_free_filter(struct perf_event *event)
1862 struct event_filter *filter = event->filter;
1864 event->filter = NULL;
1865 __free_filter(filter);
1868 struct function_filter_data {
1869 struct ftrace_ops *ops;
1874 #ifdef CONFIG_FUNCTION_TRACER
1876 ftrace_function_filter_re(char *buf, int len, int *count)
1880 str = kstrndup(buf, len, GFP_KERNEL);
1885 * The argv_split function takes white space
1886 * as a separator, so convert ',' into spaces.
1888 strreplace(str, ',', ' ');
1890 re = argv_split(GFP_KERNEL, str, count);
1895 static int ftrace_function_set_regexp(struct ftrace_ops *ops, int filter,
1896 int reset, char *re, int len)
1901 ret = ftrace_set_filter(ops, re, len, reset);
1903 ret = ftrace_set_notrace(ops, re, len, reset);
1908 static int __ftrace_function_set_filter(int filter, char *buf, int len,
1909 struct function_filter_data *data)
1911 int i, re_cnt, ret = -EINVAL;
1915 reset = filter ? &data->first_filter : &data->first_notrace;
1918 * The 'ip' field could have multiple filters set, separated
1919 * either by space or comma. We first cut the filter and apply
1920 * all pieces separatelly.
1922 re = ftrace_function_filter_re(buf, len, &re_cnt);
1926 for (i = 0; i < re_cnt; i++) {
1927 ret = ftrace_function_set_regexp(data->ops, filter, *reset,
1928 re[i], strlen(re[i]));
1940 static int ftrace_function_check_pred(struct filter_pred *pred)
1942 struct ftrace_event_field *field = pred->field;
1945 * Check the predicate for function trace, verify:
1946 * - only '==' and '!=' is used
1947 * - the 'ip' field is used
1949 if ((pred->op != OP_EQ) && (pred->op != OP_NE))
1952 if (strcmp(field->name, "ip"))
1958 static int ftrace_function_set_filter_pred(struct filter_pred *pred,
1959 struct function_filter_data *data)
1963 /* Checking the node is valid for function trace. */
1964 ret = ftrace_function_check_pred(pred);
1968 return __ftrace_function_set_filter(pred->op == OP_EQ,
1969 pred->regex.pattern,
1974 static bool is_or(struct prog_entry *prog, int i)
1979 * Only "||" is allowed for function events, thus,
1980 * all true branches should jump to true, and any
1981 * false branch should jump to false.
1983 target = prog[i].target + 1;
1984 /* True and false have NULL preds (all prog entries should jump to one */
1985 if (prog[target].pred)
1988 /* prog[target].target is 1 for TRUE, 0 for FALSE */
1989 return prog[i].when_to_branch == prog[target].target;
1992 static int ftrace_function_set_filter(struct perf_event *event,
1993 struct event_filter *filter)
1995 struct prog_entry *prog = rcu_dereference_protected(filter->prog,
1996 lockdep_is_held(&event_mutex));
1997 struct function_filter_data data = {
2000 .ops = &event->ftrace_ops,
2004 for (i = 0; prog[i].pred; i++) {
2005 struct filter_pred *pred = prog[i].pred;
2007 if (!is_or(prog, i))
2010 if (ftrace_function_set_filter_pred(pred, &data) < 0)
2016 static int ftrace_function_set_filter(struct perf_event *event,
2017 struct event_filter *filter)
2021 #endif /* CONFIG_FUNCTION_TRACER */
2023 int ftrace_profile_set_filter(struct perf_event *event, int event_id,
2027 struct event_filter *filter = NULL;
2028 struct trace_event_call *call;
2030 mutex_lock(&event_mutex);
2032 call = event->tp_event;
2042 err = create_filter(call, filter_str, false, &filter);
2046 if (ftrace_event_is_function(call))
2047 err = ftrace_function_set_filter(event, filter);
2049 event->filter = filter;
2052 if (err || ftrace_event_is_function(call))
2053 __free_filter(filter);
2056 mutex_unlock(&event_mutex);
2061 #endif /* CONFIG_PERF_EVENTS */
2063 #ifdef CONFIG_FTRACE_STARTUP_TEST
2065 #include <linux/types.h>
2066 #include <linux/tracepoint.h>
2068 #define CREATE_TRACE_POINTS
2069 #include "trace_events_filter_test.h"
2071 #define DATA_REC(m, va, vb, vc, vd, ve, vf, vg, vh, nvisit) \
2074 .rec = { .a = va, .b = vb, .c = vc, .d = vd, \
2075 .e = ve, .f = vf, .g = vg, .h = vh }, \
2077 .not_visited = nvisit, \
2082 static struct test_filter_data_t {
2084 struct trace_event_raw_ftrace_test_filter rec;
2087 } test_filter_data[] = {
2088 #define FILTER "a == 1 && b == 1 && c == 1 && d == 1 && " \
2089 "e == 1 && f == 1 && g == 1 && h == 1"
2090 DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, ""),
2091 DATA_REC(NO, 0, 1, 1, 1, 1, 1, 1, 1, "bcdefgh"),
2092 DATA_REC(NO, 1, 1, 1, 1, 1, 1, 1, 0, ""),
2094 #define FILTER "a == 1 || b == 1 || c == 1 || d == 1 || " \
2095 "e == 1 || f == 1 || g == 1 || h == 1"
2096 DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""),
2097 DATA_REC(YES, 0, 0, 0, 0, 0, 0, 0, 1, ""),
2098 DATA_REC(YES, 1, 0, 0, 0, 0, 0, 0, 0, "bcdefgh"),
2100 #define FILTER "(a == 1 || b == 1) && (c == 1 || d == 1) && " \
2101 "(e == 1 || f == 1) && (g == 1 || h == 1)"
2102 DATA_REC(NO, 0, 0, 1, 1, 1, 1, 1, 1, "dfh"),
2103 DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""),
2104 DATA_REC(YES, 1, 0, 1, 0, 0, 1, 0, 1, "bd"),
2105 DATA_REC(NO, 1, 0, 1, 0, 0, 1, 0, 0, "bd"),
2107 #define FILTER "(a == 1 && b == 1) || (c == 1 && d == 1) || " \
2108 "(e == 1 && f == 1) || (g == 1 && h == 1)"
2109 DATA_REC(YES, 1, 0, 1, 1, 1, 1, 1, 1, "efgh"),
2110 DATA_REC(YES, 0, 0, 0, 0, 0, 0, 1, 1, ""),
2111 DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""),
2113 #define FILTER "(a == 1 && b == 1) && (c == 1 && d == 1) && " \
2114 "(e == 1 && f == 1) || (g == 1 && h == 1)"
2115 DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 0, "gh"),
2116 DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 1, ""),
2117 DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, ""),
2119 #define FILTER "((a == 1 || b == 1) || (c == 1 || d == 1) || " \
2120 "(e == 1 || f == 1)) && (g == 1 || h == 1)"
2121 DATA_REC(YES, 1, 1, 1, 1, 1, 1, 0, 1, "bcdef"),
2122 DATA_REC(NO, 0, 0, 0, 0, 0, 0, 0, 0, ""),
2123 DATA_REC(YES, 1, 1, 1, 1, 1, 0, 1, 1, "h"),
2125 #define FILTER "((((((((a == 1) && (b == 1)) || (c == 1)) && (d == 1)) || " \
2126 "(e == 1)) && (f == 1)) || (g == 1)) && (h == 1))"
2127 DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "ceg"),
2128 DATA_REC(NO, 0, 1, 0, 1, 0, 1, 0, 1, ""),
2129 DATA_REC(NO, 1, 0, 1, 0, 1, 0, 1, 0, ""),
2131 #define FILTER "((((((((a == 1) || (b == 1)) && (c == 1)) || (d == 1)) && " \
2132 "(e == 1)) || (f == 1)) && (g == 1)) || (h == 1))"
2133 DATA_REC(YES, 1, 1, 1, 1, 1, 1, 1, 1, "bdfh"),
2134 DATA_REC(YES, 0, 1, 0, 1, 0, 1, 0, 1, ""),
2135 DATA_REC(YES, 1, 0, 1, 0, 1, 0, 1, 0, "bdfh"),
2143 #define DATA_CNT ARRAY_SIZE(test_filter_data)
2145 static int test_pred_visited;
2147 static int test_pred_visited_fn(struct filter_pred *pred, void *event)
2149 struct ftrace_event_field *field = pred->field;
2151 test_pred_visited = 1;
2152 printk(KERN_INFO "\npred visited %s\n", field->name);
2156 static void update_pred_fn(struct event_filter *filter, char *fields)
2158 struct prog_entry *prog = rcu_dereference_protected(filter->prog,
2159 lockdep_is_held(&event_mutex));
2162 for (i = 0; prog[i].pred; i++) {
2163 struct filter_pred *pred = prog[i].pred;
2164 struct ftrace_event_field *field = pred->field;
2166 WARN_ON_ONCE(!pred->fn);
2169 WARN_ONCE(1, "all leafs should have field defined %d", i);
2173 if (!strchr(fields, *field->name))
2176 pred->fn = test_pred_visited_fn;
2180 static __init int ftrace_test_event_filter(void)
2184 printk(KERN_INFO "Testing ftrace filter: ");
2186 for (i = 0; i < DATA_CNT; i++) {
2187 struct event_filter *filter = NULL;
2188 struct test_filter_data_t *d = &test_filter_data[i];
2191 err = create_filter(&event_ftrace_test_filter, d->filter,
2195 "Failed to get filter for '%s', err %d\n",
2197 __free_filter(filter);
2201 /* Needed to dereference filter->prog */
2202 mutex_lock(&event_mutex);
2204 * The preemption disabling is not really needed for self
2205 * tests, but the rcu dereference will complain without it.
2208 if (*d->not_visited)
2209 update_pred_fn(filter, d->not_visited);
2211 test_pred_visited = 0;
2212 err = filter_match_preds(filter, &d->rec);
2215 mutex_unlock(&event_mutex);
2217 __free_filter(filter);
2219 if (test_pred_visited) {
2221 "Failed, unwanted pred visited for filter %s\n",
2226 if (err != d->match) {
2228 "Failed to match filter '%s', expected %d\n",
2229 d->filter, d->match);
2235 printk(KERN_CONT "OK\n");
2240 late_initcall(ftrace_test_event_filter);
2242 #endif /* CONFIG_FTRACE_STARTUP_TEST */