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[mirror_ubuntu-bionic-kernel.git] / kernel / trace / trace_events_hist.c
1 /*
2 * trace_events_hist - trace event hist triggers
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * Copyright (C) 2015 Tom Zanussi <tom.zanussi@linux.intel.com>
15 */
16
17 #include <linux/module.h>
18 #include <linux/kallsyms.h>
19 #include <linux/mutex.h>
20 #include <linux/slab.h>
21 #include <linux/stacktrace.h>
22 #include <linux/rculist.h>
23
24 #include "tracing_map.h"
25 #include "trace.h"
26
27 struct hist_field;
28
29 typedef u64 (*hist_field_fn_t) (struct hist_field *field, void *event);
30
31 #define HIST_FIELD_OPERANDS_MAX 2
32
33 struct hist_field {
34 struct ftrace_event_field *field;
35 unsigned long flags;
36 hist_field_fn_t fn;
37 unsigned int size;
38 unsigned int offset;
39 unsigned int is_signed;
40 struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
41 };
42
43 static u64 hist_field_none(struct hist_field *field, void *event)
44 {
45 return 0;
46 }
47
48 static u64 hist_field_counter(struct hist_field *field, void *event)
49 {
50 return 1;
51 }
52
53 static u64 hist_field_string(struct hist_field *hist_field, void *event)
54 {
55 char *addr = (char *)(event + hist_field->field->offset);
56
57 return (u64)(unsigned long)addr;
58 }
59
60 static u64 hist_field_dynstring(struct hist_field *hist_field, void *event)
61 {
62 u32 str_item = *(u32 *)(event + hist_field->field->offset);
63 int str_loc = str_item & 0xffff;
64 char *addr = (char *)(event + str_loc);
65
66 return (u64)(unsigned long)addr;
67 }
68
69 static u64 hist_field_pstring(struct hist_field *hist_field, void *event)
70 {
71 char **addr = (char **)(event + hist_field->field->offset);
72
73 return (u64)(unsigned long)*addr;
74 }
75
76 static u64 hist_field_log2(struct hist_field *hist_field, void *event)
77 {
78 struct hist_field *operand = hist_field->operands[0];
79
80 u64 val = operand->fn(operand, event);
81
82 return (u64) ilog2(roundup_pow_of_two(val));
83 }
84
85 #define DEFINE_HIST_FIELD_FN(type) \
86 static u64 hist_field_##type(struct hist_field *hist_field, void *event)\
87 { \
88 type *addr = (type *)(event + hist_field->field->offset); \
89 \
90 return (u64)(unsigned long)*addr; \
91 }
92
93 DEFINE_HIST_FIELD_FN(s64);
94 DEFINE_HIST_FIELD_FN(u64);
95 DEFINE_HIST_FIELD_FN(s32);
96 DEFINE_HIST_FIELD_FN(u32);
97 DEFINE_HIST_FIELD_FN(s16);
98 DEFINE_HIST_FIELD_FN(u16);
99 DEFINE_HIST_FIELD_FN(s8);
100 DEFINE_HIST_FIELD_FN(u8);
101
102 #define for_each_hist_field(i, hist_data) \
103 for ((i) = 0; (i) < (hist_data)->n_fields; (i)++)
104
105 #define for_each_hist_val_field(i, hist_data) \
106 for ((i) = 0; (i) < (hist_data)->n_vals; (i)++)
107
108 #define for_each_hist_key_field(i, hist_data) \
109 for ((i) = (hist_data)->n_vals; (i) < (hist_data)->n_fields; (i)++)
110
111 #define HIST_STACKTRACE_DEPTH 16
112 #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
113 #define HIST_STACKTRACE_SKIP 5
114
115 #define HITCOUNT_IDX 0
116 #define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
117
118 enum hist_field_flags {
119 HIST_FIELD_FL_HITCOUNT = 1 << 0,
120 HIST_FIELD_FL_KEY = 1 << 1,
121 HIST_FIELD_FL_STRING = 1 << 2,
122 HIST_FIELD_FL_HEX = 1 << 3,
123 HIST_FIELD_FL_SYM = 1 << 4,
124 HIST_FIELD_FL_SYM_OFFSET = 1 << 5,
125 HIST_FIELD_FL_EXECNAME = 1 << 6,
126 HIST_FIELD_FL_SYSCALL = 1 << 7,
127 HIST_FIELD_FL_STACKTRACE = 1 << 8,
128 HIST_FIELD_FL_LOG2 = 1 << 9,
129 };
130
131 struct hist_trigger_attrs {
132 char *keys_str;
133 char *vals_str;
134 char *sort_key_str;
135 char *name;
136 bool pause;
137 bool cont;
138 bool clear;
139 unsigned int map_bits;
140 };
141
142 struct hist_trigger_data {
143 struct hist_field *fields[TRACING_MAP_FIELDS_MAX];
144 unsigned int n_vals;
145 unsigned int n_keys;
146 unsigned int n_fields;
147 unsigned int key_size;
148 struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
149 unsigned int n_sort_keys;
150 struct trace_event_file *event_file;
151 struct hist_trigger_attrs *attrs;
152 struct tracing_map *map;
153 };
154
155 static const char *hist_field_name(struct hist_field *field,
156 unsigned int level)
157 {
158 const char *field_name = "";
159
160 if (level > 1)
161 return field_name;
162
163 if (field->field)
164 field_name = field->field->name;
165 else if (field->flags & HIST_FIELD_FL_LOG2)
166 field_name = hist_field_name(field->operands[0], ++level);
167
168 if (field_name == NULL)
169 field_name = "";
170
171 return field_name;
172 }
173
174 static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
175 {
176 hist_field_fn_t fn = NULL;
177
178 switch (field_size) {
179 case 8:
180 if (field_is_signed)
181 fn = hist_field_s64;
182 else
183 fn = hist_field_u64;
184 break;
185 case 4:
186 if (field_is_signed)
187 fn = hist_field_s32;
188 else
189 fn = hist_field_u32;
190 break;
191 case 2:
192 if (field_is_signed)
193 fn = hist_field_s16;
194 else
195 fn = hist_field_u16;
196 break;
197 case 1:
198 if (field_is_signed)
199 fn = hist_field_s8;
200 else
201 fn = hist_field_u8;
202 break;
203 }
204
205 return fn;
206 }
207
208 static int parse_map_size(char *str)
209 {
210 unsigned long size, map_bits;
211 int ret;
212
213 strsep(&str, "=");
214 if (!str) {
215 ret = -EINVAL;
216 goto out;
217 }
218
219 ret = kstrtoul(str, 0, &size);
220 if (ret)
221 goto out;
222
223 map_bits = ilog2(roundup_pow_of_two(size));
224 if (map_bits < TRACING_MAP_BITS_MIN ||
225 map_bits > TRACING_MAP_BITS_MAX)
226 ret = -EINVAL;
227 else
228 ret = map_bits;
229 out:
230 return ret;
231 }
232
233 static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
234 {
235 if (!attrs)
236 return;
237
238 kfree(attrs->name);
239 kfree(attrs->sort_key_str);
240 kfree(attrs->keys_str);
241 kfree(attrs->vals_str);
242 kfree(attrs);
243 }
244
245 static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
246 {
247 struct hist_trigger_attrs *attrs;
248 int ret = 0;
249
250 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
251 if (!attrs)
252 return ERR_PTR(-ENOMEM);
253
254 while (trigger_str) {
255 char *str = strsep(&trigger_str, ":");
256
257 if ((strncmp(str, "key=", strlen("key=")) == 0) ||
258 (strncmp(str, "keys=", strlen("keys=")) == 0))
259 attrs->keys_str = kstrdup(str, GFP_KERNEL);
260 else if ((strncmp(str, "val=", strlen("val=")) == 0) ||
261 (strncmp(str, "vals=", strlen("vals=")) == 0) ||
262 (strncmp(str, "values=", strlen("values=")) == 0))
263 attrs->vals_str = kstrdup(str, GFP_KERNEL);
264 else if (strncmp(str, "sort=", strlen("sort=")) == 0)
265 attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
266 else if (strncmp(str, "name=", strlen("name=")) == 0)
267 attrs->name = kstrdup(str, GFP_KERNEL);
268 else if (strcmp(str, "pause") == 0)
269 attrs->pause = true;
270 else if ((strcmp(str, "cont") == 0) ||
271 (strcmp(str, "continue") == 0))
272 attrs->cont = true;
273 else if (strcmp(str, "clear") == 0)
274 attrs->clear = true;
275 else if (strncmp(str, "size=", strlen("size=")) == 0) {
276 int map_bits = parse_map_size(str);
277
278 if (map_bits < 0) {
279 ret = map_bits;
280 goto free;
281 }
282 attrs->map_bits = map_bits;
283 } else {
284 ret = -EINVAL;
285 goto free;
286 }
287 }
288
289 if (!attrs->keys_str) {
290 ret = -EINVAL;
291 goto free;
292 }
293
294 return attrs;
295 free:
296 destroy_hist_trigger_attrs(attrs);
297
298 return ERR_PTR(ret);
299 }
300
301 static inline void save_comm(char *comm, struct task_struct *task)
302 {
303 if (!task->pid) {
304 strcpy(comm, "<idle>");
305 return;
306 }
307
308 if (WARN_ON_ONCE(task->pid < 0)) {
309 strcpy(comm, "<XXX>");
310 return;
311 }
312
313 memcpy(comm, task->comm, TASK_COMM_LEN);
314 }
315
316 static void hist_trigger_elt_comm_free(struct tracing_map_elt *elt)
317 {
318 kfree((char *)elt->private_data);
319 }
320
321 static int hist_trigger_elt_comm_alloc(struct tracing_map_elt *elt)
322 {
323 struct hist_trigger_data *hist_data = elt->map->private_data;
324 struct hist_field *key_field;
325 unsigned int i;
326
327 for_each_hist_key_field(i, hist_data) {
328 key_field = hist_data->fields[i];
329
330 if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
331 unsigned int size = TASK_COMM_LEN + 1;
332
333 elt->private_data = kzalloc(size, GFP_KERNEL);
334 if (!elt->private_data)
335 return -ENOMEM;
336 break;
337 }
338 }
339
340 return 0;
341 }
342
343 static void hist_trigger_elt_comm_copy(struct tracing_map_elt *to,
344 struct tracing_map_elt *from)
345 {
346 char *comm_from = from->private_data;
347 char *comm_to = to->private_data;
348
349 if (comm_from)
350 memcpy(comm_to, comm_from, TASK_COMM_LEN + 1);
351 }
352
353 static void hist_trigger_elt_comm_init(struct tracing_map_elt *elt)
354 {
355 char *comm = elt->private_data;
356
357 if (comm)
358 save_comm(comm, current);
359 }
360
361 static const struct tracing_map_ops hist_trigger_elt_comm_ops = {
362 .elt_alloc = hist_trigger_elt_comm_alloc,
363 .elt_copy = hist_trigger_elt_comm_copy,
364 .elt_free = hist_trigger_elt_comm_free,
365 .elt_init = hist_trigger_elt_comm_init,
366 };
367
368 static void destroy_hist_field(struct hist_field *hist_field,
369 unsigned int level)
370 {
371 unsigned int i;
372
373 if (level > 2)
374 return;
375
376 if (!hist_field)
377 return;
378
379 for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
380 destroy_hist_field(hist_field->operands[i], level + 1);
381
382 kfree(hist_field);
383 }
384
385 static struct hist_field *create_hist_field(struct ftrace_event_field *field,
386 unsigned long flags)
387 {
388 struct hist_field *hist_field;
389
390 if (field && is_function_field(field))
391 return NULL;
392
393 hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
394 if (!hist_field)
395 return NULL;
396
397 if (flags & HIST_FIELD_FL_HITCOUNT) {
398 hist_field->fn = hist_field_counter;
399 goto out;
400 }
401
402 if (flags & HIST_FIELD_FL_STACKTRACE) {
403 hist_field->fn = hist_field_none;
404 goto out;
405 }
406
407 if (flags & HIST_FIELD_FL_LOG2) {
408 unsigned long fl = flags & ~HIST_FIELD_FL_LOG2;
409 hist_field->fn = hist_field_log2;
410 hist_field->operands[0] = create_hist_field(field, fl);
411 hist_field->size = hist_field->operands[0]->size;
412 goto out;
413 }
414
415 if (WARN_ON_ONCE(!field))
416 goto out;
417
418 if (is_string_field(field)) {
419 flags |= HIST_FIELD_FL_STRING;
420
421 if (field->filter_type == FILTER_STATIC_STRING)
422 hist_field->fn = hist_field_string;
423 else if (field->filter_type == FILTER_DYN_STRING)
424 hist_field->fn = hist_field_dynstring;
425 else
426 hist_field->fn = hist_field_pstring;
427 } else {
428 hist_field->fn = select_value_fn(field->size,
429 field->is_signed);
430 if (!hist_field->fn) {
431 destroy_hist_field(hist_field, 0);
432 return NULL;
433 }
434 }
435 out:
436 hist_field->field = field;
437 hist_field->flags = flags;
438
439 return hist_field;
440 }
441
442 static void destroy_hist_fields(struct hist_trigger_data *hist_data)
443 {
444 unsigned int i;
445
446 for (i = 0; i < TRACING_MAP_FIELDS_MAX; i++) {
447 if (hist_data->fields[i]) {
448 destroy_hist_field(hist_data->fields[i], 0);
449 hist_data->fields[i] = NULL;
450 }
451 }
452 }
453
454 static int create_hitcount_val(struct hist_trigger_data *hist_data)
455 {
456 hist_data->fields[HITCOUNT_IDX] =
457 create_hist_field(NULL, HIST_FIELD_FL_HITCOUNT);
458 if (!hist_data->fields[HITCOUNT_IDX])
459 return -ENOMEM;
460
461 hist_data->n_vals++;
462
463 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
464 return -EINVAL;
465
466 return 0;
467 }
468
469 static int create_val_field(struct hist_trigger_data *hist_data,
470 unsigned int val_idx,
471 struct trace_event_file *file,
472 char *field_str)
473 {
474 struct ftrace_event_field *field = NULL;
475 unsigned long flags = 0;
476 char *field_name;
477 int ret = 0;
478
479 if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX))
480 return -EINVAL;
481
482 field_name = strsep(&field_str, ".");
483 if (field_str) {
484 if (strcmp(field_str, "hex") == 0)
485 flags |= HIST_FIELD_FL_HEX;
486 else {
487 ret = -EINVAL;
488 goto out;
489 }
490 }
491
492 field = trace_find_event_field(file->event_call, field_name);
493 if (!field || !field->size) {
494 ret = -EINVAL;
495 goto out;
496 }
497
498 hist_data->fields[val_idx] = create_hist_field(field, flags);
499 if (!hist_data->fields[val_idx]) {
500 ret = -ENOMEM;
501 goto out;
502 }
503
504 ++hist_data->n_vals;
505
506 if (WARN_ON(hist_data->n_vals > TRACING_MAP_VALS_MAX))
507 ret = -EINVAL;
508 out:
509 return ret;
510 }
511
512 static int create_val_fields(struct hist_trigger_data *hist_data,
513 struct trace_event_file *file)
514 {
515 char *fields_str, *field_str;
516 unsigned int i, j;
517 int ret;
518
519 ret = create_hitcount_val(hist_data);
520 if (ret)
521 goto out;
522
523 fields_str = hist_data->attrs->vals_str;
524 if (!fields_str)
525 goto out;
526
527 strsep(&fields_str, "=");
528 if (!fields_str)
529 goto out;
530
531 for (i = 0, j = 1; i < TRACING_MAP_VALS_MAX &&
532 j < TRACING_MAP_VALS_MAX; i++) {
533 field_str = strsep(&fields_str, ",");
534 if (!field_str)
535 break;
536 if (strcmp(field_str, "hitcount") == 0)
537 continue;
538 ret = create_val_field(hist_data, j++, file, field_str);
539 if (ret)
540 goto out;
541 }
542 if (fields_str && (strcmp(fields_str, "hitcount") != 0))
543 ret = -EINVAL;
544 out:
545 return ret;
546 }
547
548 static int create_key_field(struct hist_trigger_data *hist_data,
549 unsigned int key_idx,
550 unsigned int key_offset,
551 struct trace_event_file *file,
552 char *field_str)
553 {
554 struct ftrace_event_field *field = NULL;
555 unsigned long flags = 0;
556 unsigned int key_size;
557 int ret = 0;
558
559 if (WARN_ON(key_idx >= TRACING_MAP_FIELDS_MAX))
560 return -EINVAL;
561
562 flags |= HIST_FIELD_FL_KEY;
563
564 if (strcmp(field_str, "stacktrace") == 0) {
565 flags |= HIST_FIELD_FL_STACKTRACE;
566 key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
567 } else {
568 char *field_name = strsep(&field_str, ".");
569
570 if (field_str) {
571 if (strcmp(field_str, "hex") == 0)
572 flags |= HIST_FIELD_FL_HEX;
573 else if (strcmp(field_str, "sym") == 0)
574 flags |= HIST_FIELD_FL_SYM;
575 else if (strcmp(field_str, "sym-offset") == 0)
576 flags |= HIST_FIELD_FL_SYM_OFFSET;
577 else if ((strcmp(field_str, "execname") == 0) &&
578 (strcmp(field_name, "common_pid") == 0))
579 flags |= HIST_FIELD_FL_EXECNAME;
580 else if (strcmp(field_str, "syscall") == 0)
581 flags |= HIST_FIELD_FL_SYSCALL;
582 else if (strcmp(field_str, "log2") == 0)
583 flags |= HIST_FIELD_FL_LOG2;
584 else {
585 ret = -EINVAL;
586 goto out;
587 }
588 }
589
590 field = trace_find_event_field(file->event_call, field_name);
591 if (!field || !field->size) {
592 ret = -EINVAL;
593 goto out;
594 }
595
596 if (is_string_field(field))
597 key_size = MAX_FILTER_STR_VAL;
598 else
599 key_size = field->size;
600 }
601
602 hist_data->fields[key_idx] = create_hist_field(field, flags);
603 if (!hist_data->fields[key_idx]) {
604 ret = -ENOMEM;
605 goto out;
606 }
607
608 key_size = ALIGN(key_size, sizeof(u64));
609 hist_data->fields[key_idx]->size = key_size;
610 hist_data->fields[key_idx]->offset = key_offset;
611 hist_data->key_size += key_size;
612 if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
613 ret = -EINVAL;
614 goto out;
615 }
616
617 hist_data->n_keys++;
618
619 if (WARN_ON(hist_data->n_keys > TRACING_MAP_KEYS_MAX))
620 return -EINVAL;
621
622 ret = key_size;
623 out:
624 return ret;
625 }
626
627 static int create_key_fields(struct hist_trigger_data *hist_data,
628 struct trace_event_file *file)
629 {
630 unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
631 char *fields_str, *field_str;
632 int ret = -EINVAL;
633
634 fields_str = hist_data->attrs->keys_str;
635 if (!fields_str)
636 goto out;
637
638 strsep(&fields_str, "=");
639 if (!fields_str)
640 goto out;
641
642 for (i = n_vals; i < n_vals + TRACING_MAP_KEYS_MAX; i++) {
643 field_str = strsep(&fields_str, ",");
644 if (!field_str)
645 break;
646 ret = create_key_field(hist_data, i, key_offset,
647 file, field_str);
648 if (ret < 0)
649 goto out;
650 key_offset += ret;
651 }
652 if (fields_str) {
653 ret = -EINVAL;
654 goto out;
655 }
656 ret = 0;
657 out:
658 return ret;
659 }
660
661 static int create_hist_fields(struct hist_trigger_data *hist_data,
662 struct trace_event_file *file)
663 {
664 int ret;
665
666 ret = create_val_fields(hist_data, file);
667 if (ret)
668 goto out;
669
670 ret = create_key_fields(hist_data, file);
671 if (ret)
672 goto out;
673
674 hist_data->n_fields = hist_data->n_vals + hist_data->n_keys;
675 out:
676 return ret;
677 }
678
679 static int is_descending(const char *str)
680 {
681 if (!str)
682 return 0;
683
684 if (strcmp(str, "descending") == 0)
685 return 1;
686
687 if (strcmp(str, "ascending") == 0)
688 return 0;
689
690 return -EINVAL;
691 }
692
693 static int create_sort_keys(struct hist_trigger_data *hist_data)
694 {
695 char *fields_str = hist_data->attrs->sort_key_str;
696 struct tracing_map_sort_key *sort_key;
697 int descending, ret = 0;
698 unsigned int i, j;
699
700 hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
701
702 if (!fields_str)
703 goto out;
704
705 strsep(&fields_str, "=");
706 if (!fields_str) {
707 ret = -EINVAL;
708 goto out;
709 }
710
711 for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
712 struct hist_field *hist_field;
713 char *field_str, *field_name;
714 const char *test_name;
715
716 sort_key = &hist_data->sort_keys[i];
717
718 field_str = strsep(&fields_str, ",");
719 if (!field_str) {
720 if (i == 0)
721 ret = -EINVAL;
722 break;
723 }
724
725 if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
726 ret = -EINVAL;
727 break;
728 }
729
730 field_name = strsep(&field_str, ".");
731 if (!field_name) {
732 ret = -EINVAL;
733 break;
734 }
735
736 if (strcmp(field_name, "hitcount") == 0) {
737 descending = is_descending(field_str);
738 if (descending < 0) {
739 ret = descending;
740 break;
741 }
742 sort_key->descending = descending;
743 continue;
744 }
745
746 for (j = 1; j < hist_data->n_fields; j++) {
747 hist_field = hist_data->fields[j];
748 test_name = hist_field_name(hist_field, 0);
749
750 if (strcmp(field_name, test_name) == 0) {
751 sort_key->field_idx = j;
752 descending = is_descending(field_str);
753 if (descending < 0) {
754 ret = descending;
755 goto out;
756 }
757 sort_key->descending = descending;
758 break;
759 }
760 }
761 if (j == hist_data->n_fields) {
762 ret = -EINVAL;
763 break;
764 }
765 }
766 hist_data->n_sort_keys = i;
767 out:
768 return ret;
769 }
770
771 static void destroy_hist_data(struct hist_trigger_data *hist_data)
772 {
773 destroy_hist_trigger_attrs(hist_data->attrs);
774 destroy_hist_fields(hist_data);
775 tracing_map_destroy(hist_data->map);
776 kfree(hist_data);
777 }
778
779 static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
780 {
781 struct tracing_map *map = hist_data->map;
782 struct ftrace_event_field *field;
783 struct hist_field *hist_field;
784 int i, idx;
785
786 for_each_hist_field(i, hist_data) {
787 hist_field = hist_data->fields[i];
788 if (hist_field->flags & HIST_FIELD_FL_KEY) {
789 tracing_map_cmp_fn_t cmp_fn;
790
791 field = hist_field->field;
792
793 if (hist_field->flags & HIST_FIELD_FL_STACKTRACE)
794 cmp_fn = tracing_map_cmp_none;
795 else if (is_string_field(field))
796 cmp_fn = tracing_map_cmp_string;
797 else
798 cmp_fn = tracing_map_cmp_num(field->size,
799 field->is_signed);
800 idx = tracing_map_add_key_field(map,
801 hist_field->offset,
802 cmp_fn);
803
804 } else
805 idx = tracing_map_add_sum_field(map);
806
807 if (idx < 0)
808 return idx;
809 }
810
811 return 0;
812 }
813
814 static bool need_tracing_map_ops(struct hist_trigger_data *hist_data)
815 {
816 struct hist_field *key_field;
817 unsigned int i;
818
819 for_each_hist_key_field(i, hist_data) {
820 key_field = hist_data->fields[i];
821
822 if (key_field->flags & HIST_FIELD_FL_EXECNAME)
823 return true;
824 }
825
826 return false;
827 }
828
829 static struct hist_trigger_data *
830 create_hist_data(unsigned int map_bits,
831 struct hist_trigger_attrs *attrs,
832 struct trace_event_file *file)
833 {
834 const struct tracing_map_ops *map_ops = NULL;
835 struct hist_trigger_data *hist_data;
836 int ret = 0;
837
838 hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
839 if (!hist_data)
840 return ERR_PTR(-ENOMEM);
841
842 hist_data->attrs = attrs;
843
844 ret = create_hist_fields(hist_data, file);
845 if (ret)
846 goto free;
847
848 ret = create_sort_keys(hist_data);
849 if (ret)
850 goto free;
851
852 if (need_tracing_map_ops(hist_data))
853 map_ops = &hist_trigger_elt_comm_ops;
854
855 hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
856 map_ops, hist_data);
857 if (IS_ERR(hist_data->map)) {
858 ret = PTR_ERR(hist_data->map);
859 hist_data->map = NULL;
860 goto free;
861 }
862
863 ret = create_tracing_map_fields(hist_data);
864 if (ret)
865 goto free;
866
867 ret = tracing_map_init(hist_data->map);
868 if (ret)
869 goto free;
870
871 hist_data->event_file = file;
872 out:
873 return hist_data;
874 free:
875 hist_data->attrs = NULL;
876
877 destroy_hist_data(hist_data);
878
879 hist_data = ERR_PTR(ret);
880
881 goto out;
882 }
883
884 static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
885 struct tracing_map_elt *elt,
886 void *rec)
887 {
888 struct hist_field *hist_field;
889 unsigned int i;
890 u64 hist_val;
891
892 for_each_hist_val_field(i, hist_data) {
893 hist_field = hist_data->fields[i];
894 hist_val = hist_field->fn(hist_field, rec);
895 tracing_map_update_sum(elt, i, hist_val);
896 }
897 }
898
899 static inline void add_to_key(char *compound_key, void *key,
900 struct hist_field *key_field, void *rec)
901 {
902 size_t size = key_field->size;
903
904 if (key_field->flags & HIST_FIELD_FL_STRING) {
905 struct ftrace_event_field *field;
906
907 field = key_field->field;
908 if (field->filter_type == FILTER_DYN_STRING)
909 size = *(u32 *)(rec + field->offset) >> 16;
910 else if (field->filter_type == FILTER_PTR_STRING)
911 size = strlen(key);
912 else if (field->filter_type == FILTER_STATIC_STRING)
913 size = field->size;
914
915 /* ensure NULL-termination */
916 if (size > key_field->size - 1)
917 size = key_field->size - 1;
918 }
919
920 memcpy(compound_key + key_field->offset, key, size);
921 }
922
923 static void event_hist_trigger(struct event_trigger_data *data, void *rec)
924 {
925 struct hist_trigger_data *hist_data = data->private_data;
926 bool use_compound_key = (hist_data->n_keys > 1);
927 unsigned long entries[HIST_STACKTRACE_DEPTH];
928 char compound_key[HIST_KEY_SIZE_MAX];
929 struct stack_trace stacktrace;
930 struct hist_field *key_field;
931 struct tracing_map_elt *elt;
932 u64 field_contents;
933 void *key = NULL;
934 unsigned int i;
935
936 memset(compound_key, 0, hist_data->key_size);
937
938 for_each_hist_key_field(i, hist_data) {
939 key_field = hist_data->fields[i];
940
941 if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
942 stacktrace.max_entries = HIST_STACKTRACE_DEPTH;
943 stacktrace.entries = entries;
944 stacktrace.nr_entries = 0;
945 stacktrace.skip = HIST_STACKTRACE_SKIP;
946
947 memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE);
948 save_stack_trace(&stacktrace);
949
950 key = entries;
951 } else {
952 field_contents = key_field->fn(key_field, rec);
953 if (key_field->flags & HIST_FIELD_FL_STRING) {
954 key = (void *)(unsigned long)field_contents;
955 use_compound_key = true;
956 } else
957 key = (void *)&field_contents;
958 }
959
960 if (use_compound_key)
961 add_to_key(compound_key, key, key_field, rec);
962 }
963
964 if (use_compound_key)
965 key = compound_key;
966
967 elt = tracing_map_insert(hist_data->map, key);
968 if (elt)
969 hist_trigger_elt_update(hist_data, elt, rec);
970 }
971
972 static void hist_trigger_stacktrace_print(struct seq_file *m,
973 unsigned long *stacktrace_entries,
974 unsigned int max_entries)
975 {
976 char str[KSYM_SYMBOL_LEN];
977 unsigned int spaces = 8;
978 unsigned int i;
979
980 for (i = 0; i < max_entries; i++) {
981 if (stacktrace_entries[i] == ULONG_MAX)
982 return;
983
984 seq_printf(m, "%*c", 1 + spaces, ' ');
985 sprint_symbol(str, stacktrace_entries[i]);
986 seq_printf(m, "%s\n", str);
987 }
988 }
989
990 static void
991 hist_trigger_entry_print(struct seq_file *m,
992 struct hist_trigger_data *hist_data, void *key,
993 struct tracing_map_elt *elt)
994 {
995 struct hist_field *key_field;
996 char str[KSYM_SYMBOL_LEN];
997 bool multiline = false;
998 const char *field_name;
999 unsigned int i;
1000 u64 uval;
1001
1002 seq_puts(m, "{ ");
1003
1004 for_each_hist_key_field(i, hist_data) {
1005 key_field = hist_data->fields[i];
1006
1007 if (i > hist_data->n_vals)
1008 seq_puts(m, ", ");
1009
1010 field_name = hist_field_name(key_field, 0);
1011
1012 if (key_field->flags & HIST_FIELD_FL_HEX) {
1013 uval = *(u64 *)(key + key_field->offset);
1014 seq_printf(m, "%s: %llx", field_name, uval);
1015 } else if (key_field->flags & HIST_FIELD_FL_SYM) {
1016 uval = *(u64 *)(key + key_field->offset);
1017 sprint_symbol_no_offset(str, uval);
1018 seq_printf(m, "%s: [%llx] %-45s", field_name,
1019 uval, str);
1020 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
1021 uval = *(u64 *)(key + key_field->offset);
1022 sprint_symbol(str, uval);
1023 seq_printf(m, "%s: [%llx] %-55s", field_name,
1024 uval, str);
1025 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
1026 char *comm = elt->private_data;
1027
1028 uval = *(u64 *)(key + key_field->offset);
1029 seq_printf(m, "%s: %-16s[%10llu]", field_name,
1030 comm, uval);
1031 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
1032 const char *syscall_name;
1033
1034 uval = *(u64 *)(key + key_field->offset);
1035 syscall_name = get_syscall_name(uval);
1036 if (!syscall_name)
1037 syscall_name = "unknown_syscall";
1038
1039 seq_printf(m, "%s: %-30s[%3llu]", field_name,
1040 syscall_name, uval);
1041 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
1042 seq_puts(m, "stacktrace:\n");
1043 hist_trigger_stacktrace_print(m,
1044 key + key_field->offset,
1045 HIST_STACKTRACE_DEPTH);
1046 multiline = true;
1047 } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
1048 seq_printf(m, "%s: ~ 2^%-2llu", field_name,
1049 *(u64 *)(key + key_field->offset));
1050 } else if (key_field->flags & HIST_FIELD_FL_STRING) {
1051 seq_printf(m, "%s: %-50s", field_name,
1052 (char *)(key + key_field->offset));
1053 } else {
1054 uval = *(u64 *)(key + key_field->offset);
1055 seq_printf(m, "%s: %10llu", field_name, uval);
1056 }
1057 }
1058
1059 if (!multiline)
1060 seq_puts(m, " ");
1061
1062 seq_puts(m, "}");
1063
1064 seq_printf(m, " hitcount: %10llu",
1065 tracing_map_read_sum(elt, HITCOUNT_IDX));
1066
1067 for (i = 1; i < hist_data->n_vals; i++) {
1068 field_name = hist_field_name(hist_data->fields[i], 0);
1069
1070 if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
1071 seq_printf(m, " %s: %10llx", field_name,
1072 tracing_map_read_sum(elt, i));
1073 } else {
1074 seq_printf(m, " %s: %10llu", field_name,
1075 tracing_map_read_sum(elt, i));
1076 }
1077 }
1078
1079 seq_puts(m, "\n");
1080 }
1081
1082 static int print_entries(struct seq_file *m,
1083 struct hist_trigger_data *hist_data)
1084 {
1085 struct tracing_map_sort_entry **sort_entries = NULL;
1086 struct tracing_map *map = hist_data->map;
1087 int i, n_entries;
1088
1089 n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
1090 hist_data->n_sort_keys,
1091 &sort_entries);
1092 if (n_entries < 0)
1093 return n_entries;
1094
1095 for (i = 0; i < n_entries; i++)
1096 hist_trigger_entry_print(m, hist_data,
1097 sort_entries[i]->key,
1098 sort_entries[i]->elt);
1099
1100 tracing_map_destroy_sort_entries(sort_entries, n_entries);
1101
1102 return n_entries;
1103 }
1104
1105 static void hist_trigger_show(struct seq_file *m,
1106 struct event_trigger_data *data, int n)
1107 {
1108 struct hist_trigger_data *hist_data;
1109 int n_entries;
1110
1111 if (n > 0)
1112 seq_puts(m, "\n\n");
1113
1114 seq_puts(m, "# event histogram\n#\n# trigger info: ");
1115 data->ops->print(m, data->ops, data);
1116 seq_puts(m, "#\n\n");
1117
1118 hist_data = data->private_data;
1119 n_entries = print_entries(m, hist_data);
1120 if (n_entries < 0)
1121 n_entries = 0;
1122
1123 seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
1124 (u64)atomic64_read(&hist_data->map->hits),
1125 n_entries, (u64)atomic64_read(&hist_data->map->drops));
1126 }
1127
1128 static int hist_show(struct seq_file *m, void *v)
1129 {
1130 struct event_trigger_data *data;
1131 struct trace_event_file *event_file;
1132 int n = 0, ret = 0;
1133
1134 mutex_lock(&event_mutex);
1135
1136 event_file = event_file_data(m->private);
1137 if (unlikely(!event_file)) {
1138 ret = -ENODEV;
1139 goto out_unlock;
1140 }
1141
1142 list_for_each_entry_rcu(data, &event_file->triggers, list) {
1143 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
1144 hist_trigger_show(m, data, n++);
1145 }
1146
1147 out_unlock:
1148 mutex_unlock(&event_mutex);
1149
1150 return ret;
1151 }
1152
1153 static int event_hist_open(struct inode *inode, struct file *file)
1154 {
1155 return single_open(file, hist_show, file);
1156 }
1157
1158 const struct file_operations event_hist_fops = {
1159 .open = event_hist_open,
1160 .read = seq_read,
1161 .llseek = seq_lseek,
1162 .release = single_release,
1163 };
1164
1165 static const char *get_hist_field_flags(struct hist_field *hist_field)
1166 {
1167 const char *flags_str = NULL;
1168
1169 if (hist_field->flags & HIST_FIELD_FL_HEX)
1170 flags_str = "hex";
1171 else if (hist_field->flags & HIST_FIELD_FL_SYM)
1172 flags_str = "sym";
1173 else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
1174 flags_str = "sym-offset";
1175 else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
1176 flags_str = "execname";
1177 else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
1178 flags_str = "syscall";
1179 else if (hist_field->flags & HIST_FIELD_FL_LOG2)
1180 flags_str = "log2";
1181
1182 return flags_str;
1183 }
1184
1185 static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
1186 {
1187 const char *field_name = hist_field_name(hist_field, 0);
1188
1189 seq_printf(m, "%s", field_name);
1190 if (hist_field->flags) {
1191 const char *flags_str = get_hist_field_flags(hist_field);
1192
1193 if (flags_str)
1194 seq_printf(m, ".%s", flags_str);
1195 }
1196 }
1197
1198 static int event_hist_trigger_print(struct seq_file *m,
1199 struct event_trigger_ops *ops,
1200 struct event_trigger_data *data)
1201 {
1202 struct hist_trigger_data *hist_data = data->private_data;
1203 struct hist_field *key_field;
1204 unsigned int i;
1205
1206 seq_puts(m, "hist:");
1207
1208 if (data->name)
1209 seq_printf(m, "%s:", data->name);
1210
1211 seq_puts(m, "keys=");
1212
1213 for_each_hist_key_field(i, hist_data) {
1214 key_field = hist_data->fields[i];
1215
1216 if (i > hist_data->n_vals)
1217 seq_puts(m, ",");
1218
1219 if (key_field->flags & HIST_FIELD_FL_STACKTRACE)
1220 seq_puts(m, "stacktrace");
1221 else
1222 hist_field_print(m, key_field);
1223 }
1224
1225 seq_puts(m, ":vals=");
1226
1227 for_each_hist_val_field(i, hist_data) {
1228 if (i == HITCOUNT_IDX)
1229 seq_puts(m, "hitcount");
1230 else {
1231 seq_puts(m, ",");
1232 hist_field_print(m, hist_data->fields[i]);
1233 }
1234 }
1235
1236 seq_puts(m, ":sort=");
1237
1238 for (i = 0; i < hist_data->n_sort_keys; i++) {
1239 struct tracing_map_sort_key *sort_key;
1240
1241 sort_key = &hist_data->sort_keys[i];
1242
1243 if (i > 0)
1244 seq_puts(m, ",");
1245
1246 if (sort_key->field_idx == HITCOUNT_IDX)
1247 seq_puts(m, "hitcount");
1248 else {
1249 unsigned int idx = sort_key->field_idx;
1250
1251 if (WARN_ON(idx >= TRACING_MAP_FIELDS_MAX))
1252 return -EINVAL;
1253
1254 hist_field_print(m, hist_data->fields[idx]);
1255 }
1256
1257 if (sort_key->descending)
1258 seq_puts(m, ".descending");
1259 }
1260
1261 seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
1262
1263 if (data->filter_str)
1264 seq_printf(m, " if %s", data->filter_str);
1265
1266 if (data->paused)
1267 seq_puts(m, " [paused]");
1268 else
1269 seq_puts(m, " [active]");
1270
1271 seq_putc(m, '\n');
1272
1273 return 0;
1274 }
1275
1276 static int event_hist_trigger_init(struct event_trigger_ops *ops,
1277 struct event_trigger_data *data)
1278 {
1279 struct hist_trigger_data *hist_data = data->private_data;
1280
1281 if (!data->ref && hist_data->attrs->name)
1282 save_named_trigger(hist_data->attrs->name, data);
1283
1284 data->ref++;
1285
1286 return 0;
1287 }
1288
1289 static void event_hist_trigger_free(struct event_trigger_ops *ops,
1290 struct event_trigger_data *data)
1291 {
1292 struct hist_trigger_data *hist_data = data->private_data;
1293
1294 if (WARN_ON_ONCE(data->ref <= 0))
1295 return;
1296
1297 data->ref--;
1298 if (!data->ref) {
1299 if (data->name)
1300 del_named_trigger(data);
1301 trigger_data_free(data);
1302 destroy_hist_data(hist_data);
1303 }
1304 }
1305
1306 static struct event_trigger_ops event_hist_trigger_ops = {
1307 .func = event_hist_trigger,
1308 .print = event_hist_trigger_print,
1309 .init = event_hist_trigger_init,
1310 .free = event_hist_trigger_free,
1311 };
1312
1313 static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
1314 struct event_trigger_data *data)
1315 {
1316 data->ref++;
1317
1318 save_named_trigger(data->named_data->name, data);
1319
1320 event_hist_trigger_init(ops, data->named_data);
1321
1322 return 0;
1323 }
1324
1325 static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
1326 struct event_trigger_data *data)
1327 {
1328 if (WARN_ON_ONCE(data->ref <= 0))
1329 return;
1330
1331 event_hist_trigger_free(ops, data->named_data);
1332
1333 data->ref--;
1334 if (!data->ref) {
1335 del_named_trigger(data);
1336 trigger_data_free(data);
1337 }
1338 }
1339
1340 static struct event_trigger_ops event_hist_trigger_named_ops = {
1341 .func = event_hist_trigger,
1342 .print = event_hist_trigger_print,
1343 .init = event_hist_trigger_named_init,
1344 .free = event_hist_trigger_named_free,
1345 };
1346
1347 static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
1348 char *param)
1349 {
1350 return &event_hist_trigger_ops;
1351 }
1352
1353 static void hist_clear(struct event_trigger_data *data)
1354 {
1355 struct hist_trigger_data *hist_data = data->private_data;
1356
1357 if (data->name)
1358 pause_named_trigger(data);
1359
1360 synchronize_sched();
1361
1362 tracing_map_clear(hist_data->map);
1363
1364 if (data->name)
1365 unpause_named_trigger(data);
1366 }
1367
1368 static bool compatible_field(struct ftrace_event_field *field,
1369 struct ftrace_event_field *test_field)
1370 {
1371 if (field == test_field)
1372 return true;
1373 if (field == NULL || test_field == NULL)
1374 return false;
1375 if (strcmp(field->name, test_field->name) != 0)
1376 return false;
1377 if (strcmp(field->type, test_field->type) != 0)
1378 return false;
1379 if (field->size != test_field->size)
1380 return false;
1381 if (field->is_signed != test_field->is_signed)
1382 return false;
1383
1384 return true;
1385 }
1386
1387 static bool hist_trigger_match(struct event_trigger_data *data,
1388 struct event_trigger_data *data_test,
1389 struct event_trigger_data *named_data,
1390 bool ignore_filter)
1391 {
1392 struct tracing_map_sort_key *sort_key, *sort_key_test;
1393 struct hist_trigger_data *hist_data, *hist_data_test;
1394 struct hist_field *key_field, *key_field_test;
1395 unsigned int i;
1396
1397 if (named_data && (named_data != data_test) &&
1398 (named_data != data_test->named_data))
1399 return false;
1400
1401 if (!named_data && is_named_trigger(data_test))
1402 return false;
1403
1404 hist_data = data->private_data;
1405 hist_data_test = data_test->private_data;
1406
1407 if (hist_data->n_vals != hist_data_test->n_vals ||
1408 hist_data->n_fields != hist_data_test->n_fields ||
1409 hist_data->n_sort_keys != hist_data_test->n_sort_keys)
1410 return false;
1411
1412 if (!ignore_filter) {
1413 if ((data->filter_str && !data_test->filter_str) ||
1414 (!data->filter_str && data_test->filter_str))
1415 return false;
1416 }
1417
1418 for_each_hist_field(i, hist_data) {
1419 key_field = hist_data->fields[i];
1420 key_field_test = hist_data_test->fields[i];
1421
1422 if (key_field->flags != key_field_test->flags)
1423 return false;
1424 if (!compatible_field(key_field->field, key_field_test->field))
1425 return false;
1426 if (key_field->offset != key_field_test->offset)
1427 return false;
1428 }
1429
1430 for (i = 0; i < hist_data->n_sort_keys; i++) {
1431 sort_key = &hist_data->sort_keys[i];
1432 sort_key_test = &hist_data_test->sort_keys[i];
1433
1434 if (sort_key->field_idx != sort_key_test->field_idx ||
1435 sort_key->descending != sort_key_test->descending)
1436 return false;
1437 }
1438
1439 if (!ignore_filter && data->filter_str &&
1440 (strcmp(data->filter_str, data_test->filter_str) != 0))
1441 return false;
1442
1443 return true;
1444 }
1445
1446 static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
1447 struct event_trigger_data *data,
1448 struct trace_event_file *file)
1449 {
1450 struct hist_trigger_data *hist_data = data->private_data;
1451 struct event_trigger_data *test, *named_data = NULL;
1452 int ret = 0;
1453
1454 if (hist_data->attrs->name) {
1455 named_data = find_named_trigger(hist_data->attrs->name);
1456 if (named_data) {
1457 if (!hist_trigger_match(data, named_data, named_data,
1458 true)) {
1459 ret = -EINVAL;
1460 goto out;
1461 }
1462 }
1463 }
1464
1465 if (hist_data->attrs->name && !named_data)
1466 goto new;
1467
1468 list_for_each_entry_rcu(test, &file->triggers, list) {
1469 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1470 if (!hist_trigger_match(data, test, named_data, false))
1471 continue;
1472 if (hist_data->attrs->pause)
1473 test->paused = true;
1474 else if (hist_data->attrs->cont)
1475 test->paused = false;
1476 else if (hist_data->attrs->clear)
1477 hist_clear(test);
1478 else
1479 ret = -EEXIST;
1480 goto out;
1481 }
1482 }
1483 new:
1484 if (hist_data->attrs->cont || hist_data->attrs->clear) {
1485 ret = -ENOENT;
1486 goto out;
1487 }
1488
1489 if (hist_data->attrs->pause)
1490 data->paused = true;
1491
1492 if (named_data) {
1493 destroy_hist_data(data->private_data);
1494 data->private_data = named_data->private_data;
1495 set_named_trigger_data(data, named_data);
1496 data->ops = &event_hist_trigger_named_ops;
1497 }
1498
1499 if (data->ops->init) {
1500 ret = data->ops->init(data->ops, data);
1501 if (ret < 0)
1502 goto out;
1503 }
1504
1505 list_add_rcu(&data->list, &file->triggers);
1506 ret++;
1507
1508 update_cond_flag(file);
1509
1510 if (trace_event_trigger_enable_disable(file, 1) < 0) {
1511 list_del_rcu(&data->list);
1512 update_cond_flag(file);
1513 ret--;
1514 }
1515 out:
1516 return ret;
1517 }
1518
1519 static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
1520 struct event_trigger_data *data,
1521 struct trace_event_file *file)
1522 {
1523 struct hist_trigger_data *hist_data = data->private_data;
1524 struct event_trigger_data *test, *named_data = NULL;
1525 bool unregistered = false;
1526
1527 if (hist_data->attrs->name)
1528 named_data = find_named_trigger(hist_data->attrs->name);
1529
1530 list_for_each_entry_rcu(test, &file->triggers, list) {
1531 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1532 if (!hist_trigger_match(data, test, named_data, false))
1533 continue;
1534 unregistered = true;
1535 list_del_rcu(&test->list);
1536 trace_event_trigger_enable_disable(file, 0);
1537 update_cond_flag(file);
1538 break;
1539 }
1540 }
1541
1542 if (unregistered && test->ops->free)
1543 test->ops->free(test->ops, test);
1544 }
1545
1546 static void hist_unreg_all(struct trace_event_file *file)
1547 {
1548 struct event_trigger_data *test, *n;
1549
1550 list_for_each_entry_safe(test, n, &file->triggers, list) {
1551 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1552 list_del_rcu(&test->list);
1553 trace_event_trigger_enable_disable(file, 0);
1554 update_cond_flag(file);
1555 if (test->ops->free)
1556 test->ops->free(test->ops, test);
1557 }
1558 }
1559 }
1560
1561 static int event_hist_trigger_func(struct event_command *cmd_ops,
1562 struct trace_event_file *file,
1563 char *glob, char *cmd, char *param)
1564 {
1565 unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
1566 struct event_trigger_data *trigger_data;
1567 struct hist_trigger_attrs *attrs;
1568 struct event_trigger_ops *trigger_ops;
1569 struct hist_trigger_data *hist_data;
1570 char *trigger;
1571 int ret = 0;
1572
1573 if (!param)
1574 return -EINVAL;
1575
1576 /* separate the trigger from the filter (k:v [if filter]) */
1577 trigger = strsep(&param, " \t");
1578 if (!trigger)
1579 return -EINVAL;
1580
1581 attrs = parse_hist_trigger_attrs(trigger);
1582 if (IS_ERR(attrs))
1583 return PTR_ERR(attrs);
1584
1585 if (attrs->map_bits)
1586 hist_trigger_bits = attrs->map_bits;
1587
1588 hist_data = create_hist_data(hist_trigger_bits, attrs, file);
1589 if (IS_ERR(hist_data)) {
1590 destroy_hist_trigger_attrs(attrs);
1591 return PTR_ERR(hist_data);
1592 }
1593
1594 trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
1595
1596 ret = -ENOMEM;
1597 trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
1598 if (!trigger_data)
1599 goto out_free;
1600
1601 trigger_data->count = -1;
1602 trigger_data->ops = trigger_ops;
1603 trigger_data->cmd_ops = cmd_ops;
1604
1605 INIT_LIST_HEAD(&trigger_data->list);
1606 RCU_INIT_POINTER(trigger_data->filter, NULL);
1607
1608 trigger_data->private_data = hist_data;
1609
1610 /* if param is non-empty, it's supposed to be a filter */
1611 if (param && cmd_ops->set_filter) {
1612 ret = cmd_ops->set_filter(param, trigger_data, file);
1613 if (ret < 0)
1614 goto out_free;
1615 }
1616
1617 if (glob[0] == '!') {
1618 cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
1619 ret = 0;
1620 goto out_free;
1621 }
1622
1623 ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
1624 /*
1625 * The above returns on success the # of triggers registered,
1626 * but if it didn't register any it returns zero. Consider no
1627 * triggers registered a failure too.
1628 */
1629 if (!ret) {
1630 if (!(attrs->pause || attrs->cont || attrs->clear))
1631 ret = -ENOENT;
1632 goto out_free;
1633 } else if (ret < 0)
1634 goto out_free;
1635 /* Just return zero, not the number of registered triggers */
1636 ret = 0;
1637 out:
1638 return ret;
1639 out_free:
1640 if (cmd_ops->set_filter)
1641 cmd_ops->set_filter(NULL, trigger_data, NULL);
1642
1643 kfree(trigger_data);
1644
1645 destroy_hist_data(hist_data);
1646 goto out;
1647 }
1648
1649 static struct event_command trigger_hist_cmd = {
1650 .name = "hist",
1651 .trigger_type = ETT_EVENT_HIST,
1652 .flags = EVENT_CMD_FL_NEEDS_REC,
1653 .func = event_hist_trigger_func,
1654 .reg = hist_register_trigger,
1655 .unreg = hist_unregister_trigger,
1656 .unreg_all = hist_unreg_all,
1657 .get_trigger_ops = event_hist_get_trigger_ops,
1658 .set_filter = set_trigger_filter,
1659 };
1660
1661 __init int register_trigger_hist_cmd(void)
1662 {
1663 int ret;
1664
1665 ret = register_event_command(&trigger_hist_cmd);
1666 WARN_ON(ret < 0);
1667
1668 return ret;
1669 }
1670
1671 static void
1672 hist_enable_trigger(struct event_trigger_data *data, void *rec)
1673 {
1674 struct enable_trigger_data *enable_data = data->private_data;
1675 struct event_trigger_data *test;
1676
1677 list_for_each_entry_rcu(test, &enable_data->file->triggers, list) {
1678 if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
1679 if (enable_data->enable)
1680 test->paused = false;
1681 else
1682 test->paused = true;
1683 }
1684 }
1685 }
1686
1687 static void
1688 hist_enable_count_trigger(struct event_trigger_data *data, void *rec)
1689 {
1690 if (!data->count)
1691 return;
1692
1693 if (data->count != -1)
1694 (data->count)--;
1695
1696 hist_enable_trigger(data, rec);
1697 }
1698
1699 static struct event_trigger_ops hist_enable_trigger_ops = {
1700 .func = hist_enable_trigger,
1701 .print = event_enable_trigger_print,
1702 .init = event_trigger_init,
1703 .free = event_enable_trigger_free,
1704 };
1705
1706 static struct event_trigger_ops hist_enable_count_trigger_ops = {
1707 .func = hist_enable_count_trigger,
1708 .print = event_enable_trigger_print,
1709 .init = event_trigger_init,
1710 .free = event_enable_trigger_free,
1711 };
1712
1713 static struct event_trigger_ops hist_disable_trigger_ops = {
1714 .func = hist_enable_trigger,
1715 .print = event_enable_trigger_print,
1716 .init = event_trigger_init,
1717 .free = event_enable_trigger_free,
1718 };
1719
1720 static struct event_trigger_ops hist_disable_count_trigger_ops = {
1721 .func = hist_enable_count_trigger,
1722 .print = event_enable_trigger_print,
1723 .init = event_trigger_init,
1724 .free = event_enable_trigger_free,
1725 };
1726
1727 static struct event_trigger_ops *
1728 hist_enable_get_trigger_ops(char *cmd, char *param)
1729 {
1730 struct event_trigger_ops *ops;
1731 bool enable;
1732
1733 enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
1734
1735 if (enable)
1736 ops = param ? &hist_enable_count_trigger_ops :
1737 &hist_enable_trigger_ops;
1738 else
1739 ops = param ? &hist_disable_count_trigger_ops :
1740 &hist_disable_trigger_ops;
1741
1742 return ops;
1743 }
1744
1745 static void hist_enable_unreg_all(struct trace_event_file *file)
1746 {
1747 struct event_trigger_data *test, *n;
1748
1749 list_for_each_entry_safe(test, n, &file->triggers, list) {
1750 if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
1751 list_del_rcu(&test->list);
1752 update_cond_flag(file);
1753 trace_event_trigger_enable_disable(file, 0);
1754 if (test->ops->free)
1755 test->ops->free(test->ops, test);
1756 }
1757 }
1758 }
1759
1760 static struct event_command trigger_hist_enable_cmd = {
1761 .name = ENABLE_HIST_STR,
1762 .trigger_type = ETT_HIST_ENABLE,
1763 .func = event_enable_trigger_func,
1764 .reg = event_enable_register_trigger,
1765 .unreg = event_enable_unregister_trigger,
1766 .unreg_all = hist_enable_unreg_all,
1767 .get_trigger_ops = hist_enable_get_trigger_ops,
1768 .set_filter = set_trigger_filter,
1769 };
1770
1771 static struct event_command trigger_hist_disable_cmd = {
1772 .name = DISABLE_HIST_STR,
1773 .trigger_type = ETT_HIST_ENABLE,
1774 .func = event_enable_trigger_func,
1775 .reg = event_enable_register_trigger,
1776 .unreg = event_enable_unregister_trigger,
1777 .unreg_all = hist_enable_unreg_all,
1778 .get_trigger_ops = hist_enable_get_trigger_ops,
1779 .set_filter = set_trigger_filter,
1780 };
1781
1782 static __init void unregister_trigger_hist_enable_disable_cmds(void)
1783 {
1784 unregister_event_command(&trigger_hist_enable_cmd);
1785 unregister_event_command(&trigger_hist_disable_cmd);
1786 }
1787
1788 __init int register_trigger_hist_enable_disable_cmds(void)
1789 {
1790 int ret;
1791
1792 ret = register_event_command(&trigger_hist_enable_cmd);
1793 if (WARN_ON(ret < 0))
1794 return ret;
1795 ret = register_event_command(&trigger_hist_disable_cmd);
1796 if (WARN_ON(ret < 0))
1797 unregister_trigger_hist_enable_disable_cmds();
1798
1799 return ret;
1800 }
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