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"
58 /* Order must be the same as enum filter_op_ids above */
59 static struct filter_op filter_ops
[] = {
70 { OP_NONE
, "OP_NONE", 0 },
71 { OP_OPEN_PAREN
, "(", 0 },
77 FILT_ERR_UNBALANCED_PAREN
,
78 FILT_ERR_TOO_MANY_OPERANDS
,
79 FILT_ERR_OPERAND_TOO_LONG
,
80 FILT_ERR_FIELD_NOT_FOUND
,
81 FILT_ERR_ILLEGAL_FIELD_OP
,
82 FILT_ERR_ILLEGAL_INTVAL
,
83 FILT_ERR_BAD_SUBSYS_FILTER
,
84 FILT_ERR_TOO_MANY_PREDS
,
85 FILT_ERR_MISSING_FIELD
,
86 FILT_ERR_INVALID_FILTER
,
87 FILT_ERR_IP_FIELD_ONLY
,
90 static char *err_text
[] = {
97 "Illegal operation for field type",
98 "Illegal integer value",
99 "Couldn't find or set field in one of a subsystem's events",
100 "Too many terms in predicate expression",
101 "Missing field name and/or value",
102 "Meaningless filter expression",
103 "Only 'ip' field is supported for function trace",
108 struct list_head list
;
114 struct list_head list
;
117 struct filter_parse_state
{
118 struct filter_op
*ops
;
119 struct list_head opstack
;
120 struct list_head postfix
;
131 char string
[MAX_FILTER_STR_VAL
];
138 struct filter_pred
**preds
;
142 #define DEFINE_COMPARISON_PRED(type) \
143 static int filter_pred_##type(struct filter_pred *pred, void *event) \
145 type *addr = (type *)(event + pred->offset); \
146 type val = (type)pred->val; \
149 switch (pred->op) { \
151 match = (*addr < val); \
154 match = (*addr <= val); \
157 match = (*addr > val); \
160 match = (*addr >= val); \
163 match = (*addr & val); \
172 #define DEFINE_EQUALITY_PRED(size) \
173 static int filter_pred_##size(struct filter_pred *pred, void *event) \
175 u##size *addr = (u##size *)(event + pred->offset); \
176 u##size val = (u##size)pred->val; \
179 match = (val == *addr) ^ pred->not; \
184 DEFINE_COMPARISON_PRED(s64
);
185 DEFINE_COMPARISON_PRED(u64
);
186 DEFINE_COMPARISON_PRED(s32
);
187 DEFINE_COMPARISON_PRED(u32
);
188 DEFINE_COMPARISON_PRED(s16
);
189 DEFINE_COMPARISON_PRED(u16
);
190 DEFINE_COMPARISON_PRED(s8
);
191 DEFINE_COMPARISON_PRED(u8
);
193 DEFINE_EQUALITY_PRED(64);
194 DEFINE_EQUALITY_PRED(32);
195 DEFINE_EQUALITY_PRED(16);
196 DEFINE_EQUALITY_PRED(8);
198 /* Filter predicate for fixed sized arrays of characters */
199 static int filter_pred_string(struct filter_pred
*pred
, void *event
)
201 char *addr
= (char *)(event
+ pred
->offset
);
204 cmp
= pred
->regex
.match(addr
, &pred
->regex
, pred
->regex
.field_len
);
206 match
= cmp
^ pred
->not;
211 /* Filter predicate for char * pointers */
212 static int filter_pred_pchar(struct filter_pred
*pred
, void *event
)
214 char **addr
= (char **)(event
+ pred
->offset
);
216 int len
= strlen(*addr
) + 1; /* including tailing '\0' */
218 cmp
= pred
->regex
.match(*addr
, &pred
->regex
, len
);
220 match
= cmp
^ pred
->not;
226 * Filter predicate for dynamic sized arrays of characters.
227 * These are implemented through a list of strings at the end
229 * Also each of these strings have a field in the entry which
230 * contains its offset from the beginning of the entry.
231 * We have then first to get this field, dereference it
232 * and add it to the address of the entry, and at last we have
233 * the address of the string.
235 static int filter_pred_strloc(struct filter_pred
*pred
, void *event
)
237 u32 str_item
= *(u32
*)(event
+ pred
->offset
);
238 int str_loc
= str_item
& 0xffff;
239 int str_len
= str_item
>> 16;
240 char *addr
= (char *)(event
+ str_loc
);
243 cmp
= pred
->regex
.match(addr
, &pred
->regex
, str_len
);
245 match
= cmp
^ pred
->not;
250 static int filter_pred_none(struct filter_pred
*pred
, void *event
)
256 * regex_match_foo - Basic regex callbacks
258 * @str: the string to be searched
259 * @r: the regex structure containing the pattern string
260 * @len: the length of the string to be searched (including '\0')
263 * - @str might not be NULL-terminated if it's of type DYN_STRING
267 static int regex_match_full(char *str
, struct regex
*r
, int len
)
269 if (strncmp(str
, r
->pattern
, len
) == 0)
274 static int regex_match_front(char *str
, struct regex
*r
, int len
)
276 if (strncmp(str
, r
->pattern
, r
->len
) == 0)
281 static int regex_match_middle(char *str
, struct regex
*r
, int len
)
283 if (strnstr(str
, r
->pattern
, len
))
288 static int regex_match_end(char *str
, struct regex
*r
, int len
)
290 int strlen
= len
- 1;
292 if (strlen
>= r
->len
&&
293 memcmp(str
+ strlen
- r
->len
, r
->pattern
, r
->len
) == 0)
299 * filter_parse_regex - parse a basic regex
300 * @buff: the raw regex
301 * @len: length of the regex
302 * @search: will point to the beginning of the string to compare
303 * @not: tell whether the match will have to be inverted
305 * This passes in a buffer containing a regex and this function will
306 * set search to point to the search part of the buffer and
307 * return the type of search it is (see enum above).
308 * This does modify buff.
311 * search returns the pointer to use for comparison.
312 * not returns 1 if buff started with a '!'
315 enum regex_type
filter_parse_regex(char *buff
, int len
, char **search
, int *not)
317 int type
= MATCH_FULL
;
320 if (buff
[0] == '!') {
329 for (i
= 0; i
< len
; i
++) {
330 if (buff
[i
] == '*') {
333 type
= MATCH_END_ONLY
;
335 if (type
== MATCH_END_ONLY
)
336 type
= MATCH_MIDDLE_ONLY
;
338 type
= MATCH_FRONT_ONLY
;
348 static void filter_build_regex(struct filter_pred
*pred
)
350 struct regex
*r
= &pred
->regex
;
352 enum regex_type type
= MATCH_FULL
;
355 if (pred
->op
== OP_GLOB
) {
356 type
= filter_parse_regex(r
->pattern
, r
->len
, &search
, ¬);
357 r
->len
= strlen(search
);
358 memmove(r
->pattern
, search
, r
->len
+1);
363 r
->match
= regex_match_full
;
365 case MATCH_FRONT_ONLY
:
366 r
->match
= regex_match_front
;
368 case MATCH_MIDDLE_ONLY
:
369 r
->match
= regex_match_middle
;
372 r
->match
= regex_match_end
;
385 static struct filter_pred
*
386 get_pred_parent(struct filter_pred
*pred
, struct filter_pred
*preds
,
387 int index
, enum move_type
*move
)
389 if (pred
->parent
& FILTER_PRED_IS_RIGHT
)
390 *move
= MOVE_UP_FROM_RIGHT
;
392 *move
= MOVE_UP_FROM_LEFT
;
393 pred
= &preds
[pred
->parent
& ~FILTER_PRED_IS_RIGHT
];
404 typedef int (*filter_pred_walkcb_t
) (enum move_type move
,
405 struct filter_pred
*pred
,
406 int *err
, void *data
);
408 static int walk_pred_tree(struct filter_pred
*preds
,
409 struct filter_pred
*root
,
410 filter_pred_walkcb_t cb
, void *data
)
412 struct filter_pred
*pred
= root
;
413 enum move_type move
= MOVE_DOWN
;
422 ret
= cb(move
, pred
, &err
, data
);
423 if (ret
== WALK_PRED_ABORT
)
425 if (ret
== WALK_PRED_PARENT
)
430 if (pred
->left
!= FILTER_PRED_INVALID
) {
431 pred
= &preds
[pred
->left
];
435 case MOVE_UP_FROM_LEFT
:
436 pred
= &preds
[pred
->right
];
439 case MOVE_UP_FROM_RIGHT
:
443 pred
= get_pred_parent(pred
, preds
,
456 * A series of AND or ORs where found together. Instead of
457 * climbing up and down the tree branches, an array of the
458 * ops were made in order of checks. We can just move across
459 * the array and short circuit if needed.
461 static int process_ops(struct filter_pred
*preds
,
462 struct filter_pred
*op
, void *rec
)
464 struct filter_pred
*pred
;
470 * Micro-optimization: We set type to true if op
471 * is an OR and false otherwise (AND). Then we
472 * just need to test if the match is equal to
473 * the type, and if it is, we can short circuit the
474 * rest of the checks:
476 * if ((match && op->op == OP_OR) ||
477 * (!match && op->op == OP_AND))
480 type
= op
->op
== OP_OR
;
482 for (i
= 0; i
< op
->val
; i
++) {
483 pred
= &preds
[op
->ops
[i
]];
484 if (!WARN_ON_ONCE(!pred
->fn
))
485 match
= pred
->fn(pred
, rec
);
492 struct filter_match_preds_data
{
493 struct filter_pred
*preds
;
498 static int filter_match_preds_cb(enum move_type move
, struct filter_pred
*pred
,
499 int *err
, void *data
)
501 struct filter_match_preds_data
*d
= data
;
506 /* only AND and OR have children */
507 if (pred
->left
!= FILTER_PRED_INVALID
) {
508 /* If ops is set, then it was folded. */
510 return WALK_PRED_DEFAULT
;
511 /* We can treat folded ops as a leaf node */
512 d
->match
= process_ops(d
->preds
, pred
, d
->rec
);
514 if (!WARN_ON_ONCE(!pred
->fn
))
515 d
->match
= pred
->fn(pred
, d
->rec
);
518 return WALK_PRED_PARENT
;
519 case MOVE_UP_FROM_LEFT
:
521 * Check for short circuits.
523 * Optimization: !!match == (pred->op == OP_OR)
525 * if ((match && pred->op == OP_OR) ||
526 * (!match && pred->op == OP_AND))
528 if (!!d
->match
== (pred
->op
== OP_OR
))
529 return WALK_PRED_PARENT
;
531 case MOVE_UP_FROM_RIGHT
:
535 return WALK_PRED_DEFAULT
;
538 /* return 1 if event matches, 0 otherwise (discard) */
539 int filter_match_preds(struct event_filter
*filter
, void *rec
)
541 struct filter_pred
*preds
;
542 struct filter_pred
*root
;
543 struct filter_match_preds_data data
= {
544 /* match is currently meaningless */
550 /* no filter is considered a match */
554 n_preds
= filter
->n_preds
;
559 * n_preds, root and filter->preds are protect with preemption disabled.
561 root
= rcu_dereference_sched(filter
->root
);
565 data
.preds
= preds
= rcu_dereference_sched(filter
->preds
);
566 ret
= walk_pred_tree(preds
, root
, filter_match_preds_cb
, &data
);
570 EXPORT_SYMBOL_GPL(filter_match_preds
);
572 static void parse_error(struct filter_parse_state
*ps
, int err
, int pos
)
575 ps
->lasterr_pos
= pos
;
578 static void remove_filter_string(struct event_filter
*filter
)
583 kfree(filter
->filter_string
);
584 filter
->filter_string
= NULL
;
587 static int replace_filter_string(struct event_filter
*filter
,
590 kfree(filter
->filter_string
);
591 filter
->filter_string
= kstrdup(filter_string
, GFP_KERNEL
);
592 if (!filter
->filter_string
)
598 static int append_filter_string(struct event_filter
*filter
,
602 char *new_filter_string
;
604 BUG_ON(!filter
->filter_string
);
605 newlen
= strlen(filter
->filter_string
) + strlen(string
) + 1;
606 new_filter_string
= kmalloc(newlen
, GFP_KERNEL
);
607 if (!new_filter_string
)
610 strcpy(new_filter_string
, filter
->filter_string
);
611 strcat(new_filter_string
, string
);
612 kfree(filter
->filter_string
);
613 filter
->filter_string
= new_filter_string
;
618 static void append_filter_err(struct filter_parse_state
*ps
,
619 struct event_filter
*filter
)
621 int pos
= ps
->lasterr_pos
;
624 buf
= (char *)__get_free_page(GFP_TEMPORARY
);
628 append_filter_string(filter
, "\n");
629 memset(buf
, ' ', PAGE_SIZE
);
630 if (pos
> PAGE_SIZE
- 128)
633 pbuf
= &buf
[pos
] + 1;
635 sprintf(pbuf
, "\nparse_error: %s\n", err_text
[ps
->lasterr
]);
636 append_filter_string(filter
, buf
);
637 free_page((unsigned long) buf
);
640 void print_event_filter(struct ftrace_event_call
*call
, struct trace_seq
*s
)
642 struct event_filter
*filter
;
644 mutex_lock(&event_mutex
);
645 filter
= call
->filter
;
646 if (filter
&& filter
->filter_string
)
647 trace_seq_printf(s
, "%s\n", filter
->filter_string
);
649 trace_seq_printf(s
, "none\n");
650 mutex_unlock(&event_mutex
);
653 void print_subsystem_event_filter(struct event_subsystem
*system
,
656 struct event_filter
*filter
;
658 mutex_lock(&event_mutex
);
659 filter
= system
->filter
;
660 if (filter
&& filter
->filter_string
)
661 trace_seq_printf(s
, "%s\n", filter
->filter_string
);
663 trace_seq_printf(s
, DEFAULT_SYS_FILTER_MESSAGE
"\n");
664 mutex_unlock(&event_mutex
);
667 static int __alloc_pred_stack(struct pred_stack
*stack
, int n_preds
)
669 stack
->preds
= kcalloc(n_preds
+ 1, sizeof(*stack
->preds
), GFP_KERNEL
);
672 stack
->index
= n_preds
;
676 static void __free_pred_stack(struct pred_stack
*stack
)
682 static int __push_pred_stack(struct pred_stack
*stack
,
683 struct filter_pred
*pred
)
685 int index
= stack
->index
;
687 if (WARN_ON(index
== 0))
690 stack
->preds
[--index
] = pred
;
691 stack
->index
= index
;
695 static struct filter_pred
*
696 __pop_pred_stack(struct pred_stack
*stack
)
698 struct filter_pred
*pred
;
699 int index
= stack
->index
;
701 pred
= stack
->preds
[index
++];
705 stack
->index
= index
;
709 static int filter_set_pred(struct event_filter
*filter
,
711 struct pred_stack
*stack
,
712 struct filter_pred
*src
)
714 struct filter_pred
*dest
= &filter
->preds
[idx
];
715 struct filter_pred
*left
;
716 struct filter_pred
*right
;
721 if (dest
->op
== OP_OR
|| dest
->op
== OP_AND
) {
722 right
= __pop_pred_stack(stack
);
723 left
= __pop_pred_stack(stack
);
727 * If both children can be folded
728 * and they are the same op as this op or a leaf,
729 * then this op can be folded.
731 if (left
->index
& FILTER_PRED_FOLD
&&
732 (left
->op
== dest
->op
||
733 left
->left
== FILTER_PRED_INVALID
) &&
734 right
->index
& FILTER_PRED_FOLD
&&
735 (right
->op
== dest
->op
||
736 right
->left
== FILTER_PRED_INVALID
))
737 dest
->index
|= FILTER_PRED_FOLD
;
739 dest
->left
= left
->index
& ~FILTER_PRED_FOLD
;
740 dest
->right
= right
->index
& ~FILTER_PRED_FOLD
;
741 left
->parent
= dest
->index
& ~FILTER_PRED_FOLD
;
742 right
->parent
= dest
->index
| FILTER_PRED_IS_RIGHT
;
745 * Make dest->left invalid to be used as a quick
746 * way to know this is a leaf node.
748 dest
->left
= FILTER_PRED_INVALID
;
750 /* All leafs allow folding the parent ops. */
751 dest
->index
|= FILTER_PRED_FOLD
;
754 return __push_pred_stack(stack
, dest
);
757 static void __free_preds(struct event_filter
*filter
)
762 for (i
= 0; i
< filter
->n_preds
; i
++)
763 kfree(filter
->preds
[i
].ops
);
764 kfree(filter
->preds
);
765 filter
->preds
= NULL
;
771 static void filter_disable(struct ftrace_event_call
*call
)
773 call
->flags
&= ~TRACE_EVENT_FL_FILTERED
;
776 static void __free_filter(struct event_filter
*filter
)
781 __free_preds(filter
);
782 kfree(filter
->filter_string
);
787 * Called when destroying the ftrace_event_call.
788 * The call is being freed, so we do not need to worry about
789 * the call being currently used. This is for module code removing
790 * the tracepoints from within it.
792 void destroy_preds(struct ftrace_event_call
*call
)
794 __free_filter(call
->filter
);
798 static struct event_filter
*__alloc_filter(void)
800 struct event_filter
*filter
;
802 filter
= kzalloc(sizeof(*filter
), GFP_KERNEL
);
806 static int __alloc_preds(struct event_filter
*filter
, int n_preds
)
808 struct filter_pred
*pred
;
812 __free_preds(filter
);
814 filter
->preds
= kcalloc(n_preds
, sizeof(*filter
->preds
), GFP_KERNEL
);
819 filter
->a_preds
= n_preds
;
822 for (i
= 0; i
< n_preds
; i
++) {
823 pred
= &filter
->preds
[i
];
824 pred
->fn
= filter_pred_none
;
830 static void filter_free_subsystem_preds(struct event_subsystem
*system
)
832 struct ftrace_event_call
*call
;
834 list_for_each_entry(call
, &ftrace_events
, list
) {
835 if (strcmp(call
->class->system
, system
->name
) != 0)
838 filter_disable(call
);
839 remove_filter_string(call
->filter
);
843 static void filter_free_subsystem_filters(struct event_subsystem
*system
)
845 struct ftrace_event_call
*call
;
847 list_for_each_entry(call
, &ftrace_events
, list
) {
848 if (strcmp(call
->class->system
, system
->name
) != 0)
850 __free_filter(call
->filter
);
855 static int filter_add_pred(struct filter_parse_state
*ps
,
856 struct event_filter
*filter
,
857 struct filter_pred
*pred
,
858 struct pred_stack
*stack
)
862 if (WARN_ON(filter
->n_preds
== filter
->a_preds
)) {
863 parse_error(ps
, FILT_ERR_TOO_MANY_PREDS
, 0);
867 err
= filter_set_pred(filter
, filter
->n_preds
, stack
, pred
);
876 int filter_assign_type(const char *type
)
878 if (strstr(type
, "__data_loc") && strstr(type
, "char"))
879 return FILTER_DYN_STRING
;
881 if (strchr(type
, '[') && strstr(type
, "char"))
882 return FILTER_STATIC_STRING
;
887 static bool is_function_field(struct ftrace_event_field
*field
)
889 return field
->filter_type
== FILTER_TRACE_FN
;
892 static bool is_string_field(struct ftrace_event_field
*field
)
894 return field
->filter_type
== FILTER_DYN_STRING
||
895 field
->filter_type
== FILTER_STATIC_STRING
||
896 field
->filter_type
== FILTER_PTR_STRING
;
899 static int is_legal_op(struct ftrace_event_field
*field
, int op
)
901 if (is_string_field(field
) &&
902 (op
!= OP_EQ
&& op
!= OP_NE
&& op
!= OP_GLOB
))
904 if (!is_string_field(field
) && op
== OP_GLOB
)
910 static filter_pred_fn_t
select_comparison_fn(int op
, int field_size
,
913 filter_pred_fn_t fn
= NULL
;
915 switch (field_size
) {
917 if (op
== OP_EQ
|| op
== OP_NE
)
919 else if (field_is_signed
)
920 fn
= filter_pred_s64
;
922 fn
= filter_pred_u64
;
925 if (op
== OP_EQ
|| op
== OP_NE
)
927 else if (field_is_signed
)
928 fn
= filter_pred_s32
;
930 fn
= filter_pred_u32
;
933 if (op
== OP_EQ
|| op
== OP_NE
)
935 else if (field_is_signed
)
936 fn
= filter_pred_s16
;
938 fn
= filter_pred_u16
;
941 if (op
== OP_EQ
|| op
== OP_NE
)
943 else if (field_is_signed
)
953 static int init_pred(struct filter_parse_state
*ps
,
954 struct ftrace_event_field
*field
,
955 struct filter_pred
*pred
)
958 filter_pred_fn_t fn
= filter_pred_none
;
959 unsigned long long val
;
962 pred
->offset
= field
->offset
;
964 if (!is_legal_op(field
, pred
->op
)) {
965 parse_error(ps
, FILT_ERR_ILLEGAL_FIELD_OP
, 0);
969 if (is_string_field(field
)) {
970 filter_build_regex(pred
);
972 if (field
->filter_type
== FILTER_STATIC_STRING
) {
973 fn
= filter_pred_string
;
974 pred
->regex
.field_len
= field
->size
;
975 } else if (field
->filter_type
== FILTER_DYN_STRING
)
976 fn
= filter_pred_strloc
;
978 fn
= filter_pred_pchar
;
979 } else if (is_function_field(field
)) {
980 if (strcmp(field
->name
, "ip")) {
981 parse_error(ps
, FILT_ERR_IP_FIELD_ONLY
, 0);
985 if (field
->is_signed
)
986 ret
= kstrtoll(pred
->regex
.pattern
, 0, &val
);
988 ret
= kstrtoull(pred
->regex
.pattern
, 0, &val
);
990 parse_error(ps
, FILT_ERR_ILLEGAL_INTVAL
, 0);
995 fn
= select_comparison_fn(pred
->op
, field
->size
,
998 parse_error(ps
, FILT_ERR_INVALID_OP
, 0);
1003 if (pred
->op
== OP_NE
)
1010 static void parse_init(struct filter_parse_state
*ps
,
1011 struct filter_op
*ops
,
1014 memset(ps
, '\0', sizeof(*ps
));
1016 ps
->infix
.string
= infix_string
;
1017 ps
->infix
.cnt
= strlen(infix_string
);
1020 INIT_LIST_HEAD(&ps
->opstack
);
1021 INIT_LIST_HEAD(&ps
->postfix
);
1024 static char infix_next(struct filter_parse_state
*ps
)
1028 return ps
->infix
.string
[ps
->infix
.tail
++];
1031 static char infix_peek(struct filter_parse_state
*ps
)
1033 if (ps
->infix
.tail
== strlen(ps
->infix
.string
))
1036 return ps
->infix
.string
[ps
->infix
.tail
];
1039 static void infix_advance(struct filter_parse_state
*ps
)
1045 static inline int is_precedence_lower(struct filter_parse_state
*ps
,
1048 return ps
->ops
[a
].precedence
< ps
->ops
[b
].precedence
;
1051 static inline int is_op_char(struct filter_parse_state
*ps
, char c
)
1055 for (i
= 0; strcmp(ps
->ops
[i
].string
, "OP_NONE"); i
++) {
1056 if (ps
->ops
[i
].string
[0] == c
)
1063 static int infix_get_op(struct filter_parse_state
*ps
, char firstc
)
1065 char nextc
= infix_peek(ps
);
1073 for (i
= 0; strcmp(ps
->ops
[i
].string
, "OP_NONE"); i
++) {
1074 if (!strcmp(opstr
, ps
->ops
[i
].string
)) {
1076 return ps
->ops
[i
].id
;
1082 for (i
= 0; strcmp(ps
->ops
[i
].string
, "OP_NONE"); i
++) {
1083 if (!strcmp(opstr
, ps
->ops
[i
].string
))
1084 return ps
->ops
[i
].id
;
1090 static inline void clear_operand_string(struct filter_parse_state
*ps
)
1092 memset(ps
->operand
.string
, '\0', MAX_FILTER_STR_VAL
);
1093 ps
->operand
.tail
= 0;
1096 static inline int append_operand_char(struct filter_parse_state
*ps
, char c
)
1098 if (ps
->operand
.tail
== MAX_FILTER_STR_VAL
- 1)
1101 ps
->operand
.string
[ps
->operand
.tail
++] = c
;
1106 static int filter_opstack_push(struct filter_parse_state
*ps
, int op
)
1108 struct opstack_op
*opstack_op
;
1110 opstack_op
= kmalloc(sizeof(*opstack_op
), GFP_KERNEL
);
1114 opstack_op
->op
= op
;
1115 list_add(&opstack_op
->list
, &ps
->opstack
);
1120 static int filter_opstack_empty(struct filter_parse_state
*ps
)
1122 return list_empty(&ps
->opstack
);
1125 static int filter_opstack_top(struct filter_parse_state
*ps
)
1127 struct opstack_op
*opstack_op
;
1129 if (filter_opstack_empty(ps
))
1132 opstack_op
= list_first_entry(&ps
->opstack
, struct opstack_op
, list
);
1134 return opstack_op
->op
;
1137 static int filter_opstack_pop(struct filter_parse_state
*ps
)
1139 struct opstack_op
*opstack_op
;
1142 if (filter_opstack_empty(ps
))
1145 opstack_op
= list_first_entry(&ps
->opstack
, struct opstack_op
, list
);
1146 op
= opstack_op
->op
;
1147 list_del(&opstack_op
->list
);
1154 static void filter_opstack_clear(struct filter_parse_state
*ps
)
1156 while (!filter_opstack_empty(ps
))
1157 filter_opstack_pop(ps
);
1160 static char *curr_operand(struct filter_parse_state
*ps
)
1162 return ps
->operand
.string
;
1165 static int postfix_append_operand(struct filter_parse_state
*ps
, char *operand
)
1167 struct postfix_elt
*elt
;
1169 elt
= kmalloc(sizeof(*elt
), GFP_KERNEL
);
1174 elt
->operand
= kstrdup(operand
, GFP_KERNEL
);
1175 if (!elt
->operand
) {
1180 list_add_tail(&elt
->list
, &ps
->postfix
);
1185 static int postfix_append_op(struct filter_parse_state
*ps
, int op
)
1187 struct postfix_elt
*elt
;
1189 elt
= kmalloc(sizeof(*elt
), GFP_KERNEL
);
1194 elt
->operand
= NULL
;
1196 list_add_tail(&elt
->list
, &ps
->postfix
);
1201 static void postfix_clear(struct filter_parse_state
*ps
)
1203 struct postfix_elt
*elt
;
1205 while (!list_empty(&ps
->postfix
)) {
1206 elt
= list_first_entry(&ps
->postfix
, struct postfix_elt
, list
);
1207 list_del(&elt
->list
);
1208 kfree(elt
->operand
);
1213 static int filter_parse(struct filter_parse_state
*ps
)
1219 while ((ch
= infix_next(ps
))) {
1231 if (is_op_char(ps
, ch
)) {
1232 op
= infix_get_op(ps
, ch
);
1233 if (op
== OP_NONE
) {
1234 parse_error(ps
, FILT_ERR_INVALID_OP
, 0);
1238 if (strlen(curr_operand(ps
))) {
1239 postfix_append_operand(ps
, curr_operand(ps
));
1240 clear_operand_string(ps
);
1243 while (!filter_opstack_empty(ps
)) {
1244 top_op
= filter_opstack_top(ps
);
1245 if (!is_precedence_lower(ps
, top_op
, op
)) {
1246 top_op
= filter_opstack_pop(ps
);
1247 postfix_append_op(ps
, top_op
);
1253 filter_opstack_push(ps
, op
);
1258 filter_opstack_push(ps
, OP_OPEN_PAREN
);
1263 if (strlen(curr_operand(ps
))) {
1264 postfix_append_operand(ps
, curr_operand(ps
));
1265 clear_operand_string(ps
);
1268 top_op
= filter_opstack_pop(ps
);
1269 while (top_op
!= OP_NONE
) {
1270 if (top_op
== OP_OPEN_PAREN
)
1272 postfix_append_op(ps
, top_op
);
1273 top_op
= filter_opstack_pop(ps
);
1275 if (top_op
== OP_NONE
) {
1276 parse_error(ps
, FILT_ERR_UNBALANCED_PAREN
, 0);
1282 if (append_operand_char(ps
, ch
)) {
1283 parse_error(ps
, FILT_ERR_OPERAND_TOO_LONG
, 0);
1288 if (strlen(curr_operand(ps
)))
1289 postfix_append_operand(ps
, curr_operand(ps
));
1291 while (!filter_opstack_empty(ps
)) {
1292 top_op
= filter_opstack_pop(ps
);
1293 if (top_op
== OP_NONE
)
1295 if (top_op
== OP_OPEN_PAREN
) {
1296 parse_error(ps
, FILT_ERR_UNBALANCED_PAREN
, 0);
1299 postfix_append_op(ps
, top_op
);
1305 static struct filter_pred
*create_pred(struct filter_parse_state
*ps
,
1306 struct ftrace_event_call
*call
,
1307 int op
, char *operand1
, char *operand2
)
1309 struct ftrace_event_field
*field
;
1310 static struct filter_pred pred
;
1312 memset(&pred
, 0, sizeof(pred
));
1315 if (op
== OP_AND
|| op
== OP_OR
)
1318 if (!operand1
|| !operand2
) {
1319 parse_error(ps
, FILT_ERR_MISSING_FIELD
, 0);
1323 field
= trace_find_event_field(call
, operand1
);
1325 parse_error(ps
, FILT_ERR_FIELD_NOT_FOUND
, 0);
1329 strcpy(pred
.regex
.pattern
, operand2
);
1330 pred
.regex
.len
= strlen(pred
.regex
.pattern
);
1332 return init_pred(ps
, field
, &pred
) ? NULL
: &pred
;
1335 static int check_preds(struct filter_parse_state
*ps
)
1337 int n_normal_preds
= 0, n_logical_preds
= 0;
1338 struct postfix_elt
*elt
;
1340 list_for_each_entry(elt
, &ps
->postfix
, list
) {
1341 if (elt
->op
== OP_NONE
)
1344 if (elt
->op
== OP_AND
|| elt
->op
== OP_OR
) {
1351 if (!n_normal_preds
|| n_logical_preds
>= n_normal_preds
) {
1352 parse_error(ps
, FILT_ERR_INVALID_FILTER
, 0);
1359 static int count_preds(struct filter_parse_state
*ps
)
1361 struct postfix_elt
*elt
;
1364 list_for_each_entry(elt
, &ps
->postfix
, list
) {
1365 if (elt
->op
== OP_NONE
)
1373 struct check_pred_data
{
1378 static int check_pred_tree_cb(enum move_type move
, struct filter_pred
*pred
,
1379 int *err
, void *data
)
1381 struct check_pred_data
*d
= data
;
1383 if (WARN_ON(d
->count
++ > d
->max
)) {
1385 return WALK_PRED_ABORT
;
1387 return WALK_PRED_DEFAULT
;
1391 * The tree is walked at filtering of an event. If the tree is not correctly
1392 * built, it may cause an infinite loop. Check here that the tree does
1395 static int check_pred_tree(struct event_filter
*filter
,
1396 struct filter_pred
*root
)
1398 struct check_pred_data data
= {
1400 * The max that we can hit a node is three times.
1401 * Once going down, once coming up from left, and
1402 * once coming up from right. This is more than enough
1403 * since leafs are only hit a single time.
1405 .max
= 3 * filter
->n_preds
,
1409 return walk_pred_tree(filter
->preds
, root
,
1410 check_pred_tree_cb
, &data
);
1413 static int count_leafs_cb(enum move_type move
, struct filter_pred
*pred
,
1414 int *err
, void *data
)
1418 if ((move
== MOVE_DOWN
) &&
1419 (pred
->left
== FILTER_PRED_INVALID
))
1422 return WALK_PRED_DEFAULT
;
1425 static int count_leafs(struct filter_pred
*preds
, struct filter_pred
*root
)
1429 ret
= walk_pred_tree(preds
, root
, count_leafs_cb
, &count
);
1434 struct fold_pred_data
{
1435 struct filter_pred
*root
;
1440 static int fold_pred_cb(enum move_type move
, struct filter_pred
*pred
,
1441 int *err
, void *data
)
1443 struct fold_pred_data
*d
= data
;
1444 struct filter_pred
*root
= d
->root
;
1446 if (move
!= MOVE_DOWN
)
1447 return WALK_PRED_DEFAULT
;
1448 if (pred
->left
!= FILTER_PRED_INVALID
)
1449 return WALK_PRED_DEFAULT
;
1451 if (WARN_ON(d
->count
== d
->children
)) {
1453 return WALK_PRED_ABORT
;
1456 pred
->index
&= ~FILTER_PRED_FOLD
;
1457 root
->ops
[d
->count
++] = pred
->index
;
1458 return WALK_PRED_DEFAULT
;
1461 static int fold_pred(struct filter_pred
*preds
, struct filter_pred
*root
)
1463 struct fold_pred_data data
= {
1469 /* No need to keep the fold flag */
1470 root
->index
&= ~FILTER_PRED_FOLD
;
1472 /* If the root is a leaf then do nothing */
1473 if (root
->left
== FILTER_PRED_INVALID
)
1476 /* count the children */
1477 children
= count_leafs(preds
, &preds
[root
->left
]);
1478 children
+= count_leafs(preds
, &preds
[root
->right
]);
1480 root
->ops
= kcalloc(children
, sizeof(*root
->ops
), GFP_KERNEL
);
1484 root
->val
= children
;
1485 data
.children
= children
;
1486 return walk_pred_tree(preds
, root
, fold_pred_cb
, &data
);
1489 static int fold_pred_tree_cb(enum move_type move
, struct filter_pred
*pred
,
1490 int *err
, void *data
)
1492 struct filter_pred
*preds
= data
;
1494 if (move
!= MOVE_DOWN
)
1495 return WALK_PRED_DEFAULT
;
1496 if (!(pred
->index
& FILTER_PRED_FOLD
))
1497 return WALK_PRED_DEFAULT
;
1499 *err
= fold_pred(preds
, pred
);
1501 return WALK_PRED_ABORT
;
1503 /* eveyrhing below is folded, continue with parent */
1504 return WALK_PRED_PARENT
;
1508 * To optimize the processing of the ops, if we have several "ors" or
1509 * "ands" together, we can put them in an array and process them all
1510 * together speeding up the filter logic.
1512 static int fold_pred_tree(struct event_filter
*filter
,
1513 struct filter_pred
*root
)
1515 return walk_pred_tree(filter
->preds
, root
, fold_pred_tree_cb
,
1519 static int replace_preds(struct ftrace_event_call
*call
,
1520 struct event_filter
*filter
,
1521 struct filter_parse_state
*ps
,
1522 char *filter_string
,
1525 char *operand1
= NULL
, *operand2
= NULL
;
1526 struct filter_pred
*pred
;
1527 struct filter_pred
*root
;
1528 struct postfix_elt
*elt
;
1529 struct pred_stack stack
= { }; /* init to NULL */
1533 n_preds
= count_preds(ps
);
1534 if (n_preds
>= MAX_FILTER_PRED
) {
1535 parse_error(ps
, FILT_ERR_TOO_MANY_PREDS
, 0);
1539 err
= check_preds(ps
);
1544 err
= __alloc_pred_stack(&stack
, n_preds
);
1547 err
= __alloc_preds(filter
, n_preds
);
1553 list_for_each_entry(elt
, &ps
->postfix
, list
) {
1554 if (elt
->op
== OP_NONE
) {
1556 operand1
= elt
->operand
;
1558 operand2
= elt
->operand
;
1560 parse_error(ps
, FILT_ERR_TOO_MANY_OPERANDS
, 0);
1567 if (WARN_ON(n_preds
++ == MAX_FILTER_PRED
)) {
1568 parse_error(ps
, FILT_ERR_TOO_MANY_PREDS
, 0);
1573 pred
= create_pred(ps
, call
, elt
->op
, operand1
, operand2
);
1580 err
= filter_add_pred(ps
, filter
, pred
, &stack
);
1585 operand1
= operand2
= NULL
;
1589 /* We should have one item left on the stack */
1590 pred
= __pop_pred_stack(&stack
);
1593 /* This item is where we start from in matching */
1595 /* Make sure the stack is empty */
1596 pred
= __pop_pred_stack(&stack
);
1597 if (WARN_ON(pred
)) {
1599 filter
->root
= NULL
;
1602 err
= check_pred_tree(filter
, root
);
1606 /* Optimize the tree */
1607 err
= fold_pred_tree(filter
, root
);
1611 /* We don't set root until we know it works */
1613 filter
->root
= root
;
1618 __free_pred_stack(&stack
);
1622 struct filter_list
{
1623 struct list_head list
;
1624 struct event_filter
*filter
;
1627 static int replace_system_preds(struct event_subsystem
*system
,
1628 struct filter_parse_state
*ps
,
1629 char *filter_string
)
1631 struct ftrace_event_call
*call
;
1632 struct filter_list
*filter_item
;
1633 struct filter_list
*tmp
;
1634 LIST_HEAD(filter_list
);
1638 list_for_each_entry(call
, &ftrace_events
, list
) {
1640 if (strcmp(call
->class->system
, system
->name
) != 0)
1644 * Try to see if the filter can be applied
1645 * (filter arg is ignored on dry_run)
1647 err
= replace_preds(call
, NULL
, ps
, filter_string
, true);
1649 call
->flags
|= TRACE_EVENT_FL_NO_SET_FILTER
;
1651 call
->flags
&= ~TRACE_EVENT_FL_NO_SET_FILTER
;
1654 list_for_each_entry(call
, &ftrace_events
, list
) {
1655 struct event_filter
*filter
;
1657 if (strcmp(call
->class->system
, system
->name
) != 0)
1660 if (call
->flags
& TRACE_EVENT_FL_NO_SET_FILTER
)
1663 filter_item
= kzalloc(sizeof(*filter_item
), GFP_KERNEL
);
1667 list_add_tail(&filter_item
->list
, &filter_list
);
1669 filter_item
->filter
= __alloc_filter();
1670 if (!filter_item
->filter
)
1672 filter
= filter_item
->filter
;
1674 /* Can only fail on no memory */
1675 err
= replace_filter_string(filter
, filter_string
);
1679 err
= replace_preds(call
, filter
, ps
, filter_string
, false);
1681 filter_disable(call
);
1682 parse_error(ps
, FILT_ERR_BAD_SUBSYS_FILTER
, 0);
1683 append_filter_err(ps
, filter
);
1685 call
->flags
|= TRACE_EVENT_FL_FILTERED
;
1687 * Regardless of if this returned an error, we still
1688 * replace the filter for the call.
1690 filter
= call
->filter
;
1691 rcu_assign_pointer(call
->filter
, filter_item
->filter
);
1692 filter_item
->filter
= filter
;
1701 * The calls can still be using the old filters.
1702 * Do a synchronize_sched() to ensure all calls are
1703 * done with them before we free them.
1705 synchronize_sched();
1706 list_for_each_entry_safe(filter_item
, tmp
, &filter_list
, list
) {
1707 __free_filter(filter_item
->filter
);
1708 list_del(&filter_item
->list
);
1713 /* No call succeeded */
1714 list_for_each_entry_safe(filter_item
, tmp
, &filter_list
, list
) {
1715 list_del(&filter_item
->list
);
1718 parse_error(ps
, FILT_ERR_BAD_SUBSYS_FILTER
, 0);
1721 /* If any call succeeded, we still need to sync */
1723 synchronize_sched();
1724 list_for_each_entry_safe(filter_item
, tmp
, &filter_list
, list
) {
1725 __free_filter(filter_item
->filter
);
1726 list_del(&filter_item
->list
);
1732 static int create_filter_start(char *filter_str
, bool set_str
,
1733 struct filter_parse_state
**psp
,
1734 struct event_filter
**filterp
)
1736 struct event_filter
*filter
;
1737 struct filter_parse_state
*ps
= NULL
;
1740 WARN_ON_ONCE(*psp
|| *filterp
);
1742 /* allocate everything, and if any fails, free all and fail */
1743 filter
= __alloc_filter();
1744 if (filter
&& set_str
)
1745 err
= replace_filter_string(filter
, filter_str
);
1747 ps
= kzalloc(sizeof(*ps
), GFP_KERNEL
);
1749 if (!filter
|| !ps
|| err
) {
1751 __free_filter(filter
);
1755 /* we're committed to creating a new filter */
1759 parse_init(ps
, filter_ops
, filter_str
);
1760 err
= filter_parse(ps
);
1762 append_filter_err(ps
, filter
);
1766 static void create_filter_finish(struct filter_parse_state
*ps
)
1769 filter_opstack_clear(ps
);
1776 * create_filter - create a filter for a ftrace_event_call
1777 * @call: ftrace_event_call to create a filter for
1778 * @filter_str: filter string
1779 * @set_str: remember @filter_str and enable detailed error in filter
1780 * @filterp: out param for created filter (always updated on return)
1782 * Creates a filter for @call with @filter_str. If @set_str is %true,
1783 * @filter_str is copied and recorded in the new filter.
1785 * On success, returns 0 and *@filterp points to the new filter. On
1786 * failure, returns -errno and *@filterp may point to %NULL or to a new
1787 * filter. In the latter case, the returned filter contains error
1788 * information if @set_str is %true and the caller is responsible for
1791 static int create_filter(struct ftrace_event_call
*call
,
1792 char *filter_str
, bool set_str
,
1793 struct event_filter
**filterp
)
1795 struct event_filter
*filter
= NULL
;
1796 struct filter_parse_state
*ps
= NULL
;
1799 err
= create_filter_start(filter_str
, set_str
, &ps
, &filter
);
1801 err
= replace_preds(call
, filter
, ps
, filter_str
, false);
1803 append_filter_err(ps
, filter
);
1805 create_filter_finish(ps
);
1812 * create_system_filter - create a filter for an event_subsystem
1813 * @system: event_subsystem to create a filter for
1814 * @filter_str: filter string
1815 * @filterp: out param for created filter (always updated on return)
1817 * Identical to create_filter() except that it creates a subsystem filter
1818 * and always remembers @filter_str.
1820 static int create_system_filter(struct event_subsystem
*system
,
1821 char *filter_str
, struct event_filter
**filterp
)
1823 struct event_filter
*filter
= NULL
;
1824 struct filter_parse_state
*ps
= NULL
;
1827 err
= create_filter_start(filter_str
, true, &ps
, &filter
);
1829 err
= replace_system_preds(system
, ps
, filter_str
);
1831 /* System filters just show a default message */
1832 kfree(filter
->filter_string
);
1833 filter
->filter_string
= NULL
;
1835 append_filter_err(ps
, filter
);
1838 create_filter_finish(ps
);
1844 int apply_event_filter(struct ftrace_event_call
*call
, char *filter_string
)
1846 struct event_filter
*filter
;
1849 mutex_lock(&event_mutex
);
1851 if (!strcmp(strstrip(filter_string
), "0")) {
1852 filter_disable(call
);
1853 filter
= call
->filter
;
1856 RCU_INIT_POINTER(call
->filter
, NULL
);
1857 /* Make sure the filter is not being used */
1858 synchronize_sched();
1859 __free_filter(filter
);
1863 err
= create_filter(call
, filter_string
, true, &filter
);
1866 * Always swap the call filter with the new filter
1867 * even if there was an error. If there was an error
1868 * in the filter, we disable the filter and show the error
1872 struct event_filter
*tmp
= call
->filter
;
1875 call
->flags
|= TRACE_EVENT_FL_FILTERED
;
1877 filter_disable(call
);
1879 rcu_assign_pointer(call
->filter
, filter
);
1882 /* Make sure the call is done with the filter */
1883 synchronize_sched();
1888 mutex_unlock(&event_mutex
);
1893 int apply_subsystem_event_filter(struct ftrace_subsystem_dir
*dir
,
1894 char *filter_string
)
1896 struct event_subsystem
*system
= dir
->subsystem
;
1897 struct event_filter
*filter
;
1900 mutex_lock(&event_mutex
);
1902 /* Make sure the system still has events */
1903 if (!dir
->nr_events
) {
1908 if (!strcmp(strstrip(filter_string
), "0")) {
1909 filter_free_subsystem_preds(system
);
1910 remove_filter_string(system
->filter
);
1911 filter
= system
->filter
;
1912 system
->filter
= NULL
;
1913 /* Ensure all filters are no longer used */
1914 synchronize_sched();
1915 filter_free_subsystem_filters(system
);
1916 __free_filter(filter
);
1920 err
= create_system_filter(system
, filter_string
, &filter
);
1923 * No event actually uses the system filter
1924 * we can free it without synchronize_sched().
1926 __free_filter(system
->filter
);
1927 system
->filter
= filter
;
1930 mutex_unlock(&event_mutex
);
1935 #ifdef CONFIG_PERF_EVENTS
1937 void ftrace_profile_free_filter(struct perf_event
*event
)
1939 struct event_filter
*filter
= event
->filter
;
1941 event
->filter
= NULL
;
1942 __free_filter(filter
);
1945 struct function_filter_data
{
1946 struct ftrace_ops
*ops
;
1951 #ifdef CONFIG_FUNCTION_TRACER
1953 ftrace_function_filter_re(char *buf
, int len
, int *count
)
1955 char *str
, *sep
, **re
;
1957 str
= kstrndup(buf
, len
, GFP_KERNEL
);
1962 * The argv_split function takes white space
1963 * as a separator, so convert ',' into spaces.
1965 while ((sep
= strchr(str
, ',')))
1968 re
= argv_split(GFP_KERNEL
, str
, count
);
1973 static int ftrace_function_set_regexp(struct ftrace_ops
*ops
, int filter
,
1974 int reset
, char *re
, int len
)
1979 ret
= ftrace_set_filter(ops
, re
, len
, reset
);
1981 ret
= ftrace_set_notrace(ops
, re
, len
, reset
);
1986 static int __ftrace_function_set_filter(int filter
, char *buf
, int len
,
1987 struct function_filter_data
*data
)
1989 int i
, re_cnt
, ret
= -EINVAL
;
1993 reset
= filter
? &data
->first_filter
: &data
->first_notrace
;
1996 * The 'ip' field could have multiple filters set, separated
1997 * either by space or comma. We first cut the filter and apply
1998 * all pieces separatelly.
2000 re
= ftrace_function_filter_re(buf
, len
, &re_cnt
);
2004 for (i
= 0; i
< re_cnt
; i
++) {
2005 ret
= ftrace_function_set_regexp(data
->ops
, filter
, *reset
,
2006 re
[i
], strlen(re
[i
]));
2018 static int ftrace_function_check_pred(struct filter_pred
*pred
, int leaf
)
2020 struct ftrace_event_field
*field
= pred
->field
;
2024 * Check the leaf predicate for function trace, verify:
2025 * - only '==' and '!=' is used
2026 * - the 'ip' field is used
2028 if ((pred
->op
!= OP_EQ
) && (pred
->op
!= OP_NE
))
2031 if (strcmp(field
->name
, "ip"))
2035 * Check the non leaf predicate for function trace, verify:
2036 * - only '||' is used
2038 if (pred
->op
!= OP_OR
)
2045 static int ftrace_function_set_filter_cb(enum move_type move
,
2046 struct filter_pred
*pred
,
2047 int *err
, void *data
)
2049 /* Checking the node is valid for function trace. */
2050 if ((move
!= MOVE_DOWN
) ||
2051 (pred
->left
!= FILTER_PRED_INVALID
)) {
2052 *err
= ftrace_function_check_pred(pred
, 0);
2054 *err
= ftrace_function_check_pred(pred
, 1);
2056 return WALK_PRED_ABORT
;
2058 *err
= __ftrace_function_set_filter(pred
->op
== OP_EQ
,
2059 pred
->regex
.pattern
,
2064 return (*err
) ? WALK_PRED_ABORT
: WALK_PRED_DEFAULT
;
2067 static int ftrace_function_set_filter(struct perf_event
*event
,
2068 struct event_filter
*filter
)
2070 struct function_filter_data data
= {
2073 .ops
= &event
->ftrace_ops
,
2076 return walk_pred_tree(filter
->preds
, filter
->root
,
2077 ftrace_function_set_filter_cb
, &data
);
2080 static int ftrace_function_set_filter(struct perf_event
*event
,
2081 struct event_filter
*filter
)
2085 #endif /* CONFIG_FUNCTION_TRACER */
2087 int ftrace_profile_set_filter(struct perf_event
*event
, int event_id
,
2091 struct event_filter
*filter
;
2092 struct ftrace_event_call
*call
;
2094 mutex_lock(&event_mutex
);
2096 call
= event
->tp_event
;
2106 err
= create_filter(call
, filter_str
, false, &filter
);
2110 if (ftrace_event_is_function(call
))
2111 err
= ftrace_function_set_filter(event
, filter
);
2113 event
->filter
= filter
;
2116 if (err
|| ftrace_event_is_function(call
))
2117 __free_filter(filter
);
2120 mutex_unlock(&event_mutex
);
2125 #endif /* CONFIG_PERF_EVENTS */
2127 #ifdef CONFIG_FTRACE_STARTUP_TEST
2129 #include <linux/types.h>
2130 #include <linux/tracepoint.h>
2132 #define CREATE_TRACE_POINTS
2133 #include "trace_events_filter_test.h"
2135 #define DATA_REC(m, va, vb, vc, vd, ve, vf, vg, vh, nvisit) \
2138 .rec = { .a = va, .b = vb, .c = vc, .d = vd, \
2139 .e = ve, .f = vf, .g = vg, .h = vh }, \
2141 .not_visited = nvisit, \
2146 static struct test_filter_data_t
{
2148 struct ftrace_raw_ftrace_test_filter rec
;
2151 } test_filter_data
[] = {
2152 #define FILTER "a == 1 && b == 1 && c == 1 && d == 1 && " \
2153 "e == 1 && f == 1 && g == 1 && h == 1"
2154 DATA_REC(YES
, 1, 1, 1, 1, 1, 1, 1, 1, ""),
2155 DATA_REC(NO
, 0, 1, 1, 1, 1, 1, 1, 1, "bcdefgh"),
2156 DATA_REC(NO
, 1, 1, 1, 1, 1, 1, 1, 0, ""),
2158 #define FILTER "a == 1 || b == 1 || c == 1 || d == 1 || " \
2159 "e == 1 || f == 1 || g == 1 || h == 1"
2160 DATA_REC(NO
, 0, 0, 0, 0, 0, 0, 0, 0, ""),
2161 DATA_REC(YES
, 0, 0, 0, 0, 0, 0, 0, 1, ""),
2162 DATA_REC(YES
, 1, 0, 0, 0, 0, 0, 0, 0, "bcdefgh"),
2164 #define FILTER "(a == 1 || b == 1) && (c == 1 || d == 1) && " \
2165 "(e == 1 || f == 1) && (g == 1 || h == 1)"
2166 DATA_REC(NO
, 0, 0, 1, 1, 1, 1, 1, 1, "dfh"),
2167 DATA_REC(YES
, 0, 1, 0, 1, 0, 1, 0, 1, ""),
2168 DATA_REC(YES
, 1, 0, 1, 0, 0, 1, 0, 1, "bd"),
2169 DATA_REC(NO
, 1, 0, 1, 0, 0, 1, 0, 0, "bd"),
2171 #define FILTER "(a == 1 && b == 1) || (c == 1 && d == 1) || " \
2172 "(e == 1 && f == 1) || (g == 1 && h == 1)"
2173 DATA_REC(YES
, 1, 0, 1, 1, 1, 1, 1, 1, "efgh"),
2174 DATA_REC(YES
, 0, 0, 0, 0, 0, 0, 1, 1, ""),
2175 DATA_REC(NO
, 0, 0, 0, 0, 0, 0, 0, 1, ""),
2177 #define FILTER "(a == 1 && b == 1) && (c == 1 && d == 1) && " \
2178 "(e == 1 && f == 1) || (g == 1 && h == 1)"
2179 DATA_REC(YES
, 1, 1, 1, 1, 1, 1, 0, 0, "gh"),
2180 DATA_REC(NO
, 0, 0, 0, 0, 0, 0, 0, 1, ""),
2181 DATA_REC(YES
, 1, 1, 1, 1, 1, 0, 1, 1, ""),
2183 #define FILTER "((a == 1 || b == 1) || (c == 1 || d == 1) || " \
2184 "(e == 1 || f == 1)) && (g == 1 || h == 1)"
2185 DATA_REC(YES
, 1, 1, 1, 1, 1, 1, 0, 1, "bcdef"),
2186 DATA_REC(NO
, 0, 0, 0, 0, 0, 0, 0, 0, ""),
2187 DATA_REC(YES
, 1, 1, 1, 1, 1, 0, 1, 1, "h"),
2189 #define FILTER "((((((((a == 1) && (b == 1)) || (c == 1)) && (d == 1)) || " \
2190 "(e == 1)) && (f == 1)) || (g == 1)) && (h == 1))"
2191 DATA_REC(YES
, 1, 1, 1, 1, 1, 1, 1, 1, "ceg"),
2192 DATA_REC(NO
, 0, 1, 0, 1, 0, 1, 0, 1, ""),
2193 DATA_REC(NO
, 1, 0, 1, 0, 1, 0, 1, 0, ""),
2195 #define FILTER "((((((((a == 1) || (b == 1)) && (c == 1)) || (d == 1)) && " \
2196 "(e == 1)) || (f == 1)) && (g == 1)) || (h == 1))"
2197 DATA_REC(YES
, 1, 1, 1, 1, 1, 1, 1, 1, "bdfh"),
2198 DATA_REC(YES
, 0, 1, 0, 1, 0, 1, 0, 1, ""),
2199 DATA_REC(YES
, 1, 0, 1, 0, 1, 0, 1, 0, "bdfh"),
2207 #define DATA_CNT (sizeof(test_filter_data)/sizeof(struct test_filter_data_t))
2209 static int test_pred_visited
;
2211 static int test_pred_visited_fn(struct filter_pred
*pred
, void *event
)
2213 struct ftrace_event_field
*field
= pred
->field
;
2215 test_pred_visited
= 1;
2216 printk(KERN_INFO
"\npred visited %s\n", field
->name
);
2220 static int test_walk_pred_cb(enum move_type move
, struct filter_pred
*pred
,
2221 int *err
, void *data
)
2223 char *fields
= data
;
2225 if ((move
== MOVE_DOWN
) &&
2226 (pred
->left
== FILTER_PRED_INVALID
)) {
2227 struct ftrace_event_field
*field
= pred
->field
;
2230 WARN(1, "all leafs should have field defined");
2231 return WALK_PRED_DEFAULT
;
2233 if (!strchr(fields
, *field
->name
))
2234 return WALK_PRED_DEFAULT
;
2237 pred
->fn
= test_pred_visited_fn
;
2239 return WALK_PRED_DEFAULT
;
2242 static __init
int ftrace_test_event_filter(void)
2246 printk(KERN_INFO
"Testing ftrace filter: ");
2248 for (i
= 0; i
< DATA_CNT
; i
++) {
2249 struct event_filter
*filter
= NULL
;
2250 struct test_filter_data_t
*d
= &test_filter_data
[i
];
2253 err
= create_filter(&event_ftrace_test_filter
, d
->filter
,
2257 "Failed to get filter for '%s', err %d\n",
2259 __free_filter(filter
);
2264 * The preemption disabling is not really needed for self
2265 * tests, but the rcu dereference will complain without it.
2268 if (*d
->not_visited
)
2269 walk_pred_tree(filter
->preds
, filter
->root
,
2273 test_pred_visited
= 0;
2274 err
= filter_match_preds(filter
, &d
->rec
);
2277 __free_filter(filter
);
2279 if (test_pred_visited
) {
2281 "Failed, unwanted pred visited for filter %s\n",
2286 if (err
!= d
->match
) {
2288 "Failed to match filter '%s', expected %d\n",
2289 d
->filter
, d
->match
);
2295 printk(KERN_CONT
"OK\n");
2300 late_initcall(ftrace_test_event_filter
);
2302 #endif /* CONFIG_FTRACE_STARTUP_TEST */