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perf tools: Fix find tids routine by excluding "." and ".."
[cris-mirror.git] / tools / perf / util / probe-event.c
blob914c67095d965d14ca7ca8b1c58f37ba83b9573c
1 /*
2 * probe-event.c : perf-probe definition to kprobe_events format converter
3 *
4 * Written by Masami Hiramatsu <mhiramat@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 *
20 */
21
22 #define _GNU_SOURCE
23 #include <sys/utsname.h>
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <fcntl.h>
27 #include <errno.h>
28 #include <stdio.h>
29 #include <unistd.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <stdarg.h>
33 #include <limits.h>
34
35 #undef _GNU_SOURCE
36 #include "util.h"
37 #include "event.h"
38 #include "string.h"
39 #include "strlist.h"
40 #include "debug.h"
41 #include "cache.h"
42 #include "color.h"
43 #include "symbol.h"
44 #include "thread.h"
45 #include "debugfs.h"
46 #include "trace-event.h" /* For __unused */
47 #include "probe-event.h"
48 #include "probe-finder.h"
49
50 #define MAX_CMDLEN 256
51 #define MAX_PROBE_ARGS 128
52 #define PERFPROBE_GROUP "probe"
53
54 bool probe_event_dry_run; /* Dry run flag */
55
56 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
57
58 /* If there is no space to write, returns -E2BIG. */
59 static int e_snprintf(char *str, size_t size, const char *format, ...)
60 __attribute__((format(printf, 3, 4)));
61
62 static int e_snprintf(char *str, size_t size, const char *format, ...)
63 {
64 int ret;
65 va_list ap;
66 va_start(ap, format);
67 ret = vsnprintf(str, size, format, ap);
68 va_end(ap);
69 if (ret >= (int)size)
70 ret = -E2BIG;
71 return ret;
72 }
73
74 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
75 static struct machine machine;
76
77 /* Initialize symbol maps and path of vmlinux */
78 static int init_vmlinux(void)
79 {
80 struct dso *kernel;
81 int ret;
82
83 symbol_conf.sort_by_name = true;
84 if (symbol_conf.vmlinux_name == NULL)
85 symbol_conf.try_vmlinux_path = true;
86 else
87 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
88 ret = symbol__init();
89 if (ret < 0) {
90 pr_debug("Failed to init symbol map.\n");
91 goto out;
92 }
93
94 ret = machine__init(&machine, "/", 0);
95 if (ret < 0)
96 goto out;
97
98 kernel = dso__new_kernel(symbol_conf.vmlinux_name);
99 if (kernel == NULL)
100 die("Failed to create kernel dso.");
101
102 ret = __machine__create_kernel_maps(&machine, kernel);
103 if (ret < 0)
104 pr_debug("Failed to create kernel maps.\n");
105
106 out:
107 if (ret < 0)
108 pr_warning("Failed to init vmlinux path.\n");
109 return ret;
110 }
111
112 #ifdef DWARF_SUPPORT
113 static int open_vmlinux(void)
114 {
115 if (map__load(machine.vmlinux_maps[MAP__FUNCTION], NULL) < 0) {
116 pr_debug("Failed to load kernel map.\n");
117 return -EINVAL;
118 }
119 pr_debug("Try to open %s\n", machine.vmlinux_maps[MAP__FUNCTION]->dso->long_name);
120 return open(machine.vmlinux_maps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
121 }
122
123 /* Convert trace point to probe point with debuginfo */
124 static int convert_to_perf_probe_point(struct kprobe_trace_point *tp,
125 struct perf_probe_point *pp)
126 {
127 struct symbol *sym;
128 int fd, ret = -ENOENT;
129
130 sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION],
131 tp->symbol, NULL);
132 if (sym) {
133 fd = open_vmlinux();
134 if (fd >= 0) {
135 ret = find_perf_probe_point(fd,
136 sym->start + tp->offset, pp);
137 close(fd);
138 }
139 }
140 if (ret <= 0) {
141 pr_debug("Failed to find corresponding probes from "
142 "debuginfo. Use kprobe event information.\n");
143 pp->function = strdup(tp->symbol);
144 if (pp->function == NULL)
145 return -ENOMEM;
146 pp->offset = tp->offset;
147 }
148 pp->retprobe = tp->retprobe;
149
150 return 0;
151 }
152
153 /* Try to find perf_probe_event with debuginfo */
154 static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
155 struct kprobe_trace_event **tevs,
156 int max_tevs)
157 {
158 bool need_dwarf = perf_probe_event_need_dwarf(pev);
159 int fd, ntevs;
160
161 fd = open_vmlinux();
162 if (fd < 0) {
163 if (need_dwarf) {
164 pr_warning("Failed to open debuginfo file.\n");
165 return fd;
166 }
167 pr_debug("Could not open vmlinux. Try to use symbols.\n");
168 return 0;
169 }
170
171 /* Searching trace events corresponding to probe event */
172 ntevs = find_kprobe_trace_events(fd, pev, tevs, max_tevs);
173 close(fd);
174
175 if (ntevs > 0) { /* Succeeded to find trace events */
176 pr_debug("find %d kprobe_trace_events.\n", ntevs);
177 return ntevs;
178 }
179
180 if (ntevs == 0) { /* No error but failed to find probe point. */
181 pr_warning("Probe point '%s' not found.\n",
182 synthesize_perf_probe_point(&pev->point));
183 return -ENOENT;
184 }
185 /* Error path : ntevs < 0 */
186 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
187 if (ntevs == -EBADF) {
188 pr_warning("Warning: No dwarf info found in the vmlinux - "
189 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
190 if (!need_dwarf) {
191 pr_debug("Trying to use symbols.\nn");
192 return 0;
193 }
194 }
195 return ntevs;
196 }
197
198 #define LINEBUF_SIZE 256
199 #define NR_ADDITIONAL_LINES 2
200
201 static int show_one_line(FILE *fp, int l, bool skip, bool show_num)
202 {
203 char buf[LINEBUF_SIZE];
204 const char *color = PERF_COLOR_BLUE;
205
206 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
207 goto error;
208 if (!skip) {
209 if (show_num)
210 fprintf(stdout, "%7d %s", l, buf);
211 else
212 color_fprintf(stdout, color, " %s", buf);
213 }
214
215 while (strlen(buf) == LINEBUF_SIZE - 1 &&
216 buf[LINEBUF_SIZE - 2] != '\n') {
217 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
218 goto error;
219 if (!skip) {
220 if (show_num)
221 fprintf(stdout, "%s", buf);
222 else
223 color_fprintf(stdout, color, "%s", buf);
224 }
225 }
226
227 return 0;
228 error:
229 if (feof(fp))
230 pr_warning("Source file is shorter than expected.\n");
231 else
232 pr_warning("File read error: %s\n", strerror(errno));
233
234 return -1;
235 }
236
237 /*
238 * Show line-range always requires debuginfo to find source file and
239 * line number.
240 */
241 int show_line_range(struct line_range *lr)
242 {
243 int l = 1;
244 struct line_node *ln;
245 FILE *fp;
246 int fd, ret;
247
248 /* Search a line range */
249 ret = init_vmlinux();
250 if (ret < 0)
251 return ret;
252
253 fd = open_vmlinux();
254 if (fd < 0) {
255 pr_warning("Failed to open debuginfo file.\n");
256 return fd;
257 }
258
259 ret = find_line_range(fd, lr);
260 close(fd);
261 if (ret == 0) {
262 pr_warning("Specified source line is not found.\n");
263 return -ENOENT;
264 } else if (ret < 0) {
265 pr_warning("Debuginfo analysis failed. (%d)\n", ret);
266 return ret;
267 }
268
269 setup_pager();
270
271 if (lr->function)
272 fprintf(stdout, "<%s:%d>\n", lr->function,
273 lr->start - lr->offset);
274 else
275 fprintf(stdout, "<%s:%d>\n", lr->file, lr->start);
276
277 fp = fopen(lr->path, "r");
278 if (fp == NULL) {
279 pr_warning("Failed to open %s: %s\n", lr->path,
280 strerror(errno));
281 return -errno;
282 }
283 /* Skip to starting line number */
284 while (l < lr->start && ret >= 0)
285 ret = show_one_line(fp, l++, true, false);
286 if (ret < 0)
287 goto end;
288
289 list_for_each_entry(ln, &lr->line_list, list) {
290 while (ln->line > l && ret >= 0)
291 ret = show_one_line(fp, (l++) - lr->offset,
292 false, false);
293 if (ret >= 0)
294 ret = show_one_line(fp, (l++) - lr->offset,
295 false, true);
296 if (ret < 0)
297 goto end;
298 }
299
300 if (lr->end == INT_MAX)
301 lr->end = l + NR_ADDITIONAL_LINES;
302 while (l <= lr->end && !feof(fp) && ret >= 0)
303 ret = show_one_line(fp, (l++) - lr->offset, false, false);
304 end:
305 fclose(fp);
306 return ret;
307 }
308
309 #else /* !DWARF_SUPPORT */
310
311 static int convert_to_perf_probe_point(struct kprobe_trace_point *tp,
312 struct perf_probe_point *pp)
313 {
314 pp->function = strdup(tp->symbol);
315 if (pp->function == NULL)
316 return -ENOMEM;
317 pp->offset = tp->offset;
318 pp->retprobe = tp->retprobe;
319
320 return 0;
321 }
322
323 static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
324 struct kprobe_trace_event **tevs __unused,
325 int max_tevs __unused)
326 {
327 if (perf_probe_event_need_dwarf(pev)) {
328 pr_warning("Debuginfo-analysis is not supported.\n");
329 return -ENOSYS;
330 }
331 return 0;
332 }
333
334 int show_line_range(struct line_range *lr __unused)
335 {
336 pr_warning("Debuginfo-analysis is not supported.\n");
337 return -ENOSYS;
338 }
339
340 #endif
341
342 int parse_line_range_desc(const char *arg, struct line_range *lr)
343 {
344 const char *ptr;
345 char *tmp;
346 /*
347 * <Syntax>
348 * SRC:SLN[+NUM|-ELN]
349 * FUNC[:SLN[+NUM|-ELN]]
350 */
351 ptr = strchr(arg, ':');
352 if (ptr) {
353 lr->start = (int)strtoul(ptr + 1, &tmp, 0);
354 if (*tmp == '+') {
355 lr->end = lr->start + (int)strtoul(tmp + 1, &tmp, 0);
356 lr->end--; /*
357 * Adjust the number of lines here.
358 * If the number of lines == 1, the
359 * the end of line should be equal to
360 * the start of line.
361 */
362 } else if (*tmp == '-')
363 lr->end = (int)strtoul(tmp + 1, &tmp, 0);
364 else
365 lr->end = INT_MAX;
366 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
367 if (lr->start > lr->end) {
368 semantic_error("Start line must be smaller"
369 " than end line.\n");
370 return -EINVAL;
371 }
372 if (*tmp != '\0') {
373 semantic_error("Tailing with invalid character '%d'.\n",
374 *tmp);
375 return -EINVAL;
376 }
377 tmp = strndup(arg, (ptr - arg));
378 } else {
379 tmp = strdup(arg);
380 lr->end = INT_MAX;
381 }
382
383 if (tmp == NULL)
384 return -ENOMEM;
385
386 if (strchr(tmp, '.'))
387 lr->file = tmp;
388 else
389 lr->function = tmp;
390
391 return 0;
392 }
393
394 /* Check the name is good for event/group */
395 static bool check_event_name(const char *name)
396 {
397 if (!isalpha(*name) && *name != '_')
398 return false;
399 while (*++name != '\0') {
400 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
401 return false;
402 }
403 return true;
404 }
405
406 /* Parse probepoint definition. */
407 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
408 {
409 struct perf_probe_point *pp = &pev->point;
410 char *ptr, *tmp;
411 char c, nc = 0;
412 /*
413 * <Syntax>
414 * perf probe [EVENT=]SRC[:LN|;PTN]
415 * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
416 *
417 * TODO:Group name support
418 */
419
420 ptr = strpbrk(arg, ";=@+%");
421 if (ptr && *ptr == '=') { /* Event name */
422 *ptr = '\0';
423 tmp = ptr + 1;
424 if (strchr(arg, ':')) {
425 semantic_error("Group name is not supported yet.\n");
426 return -ENOTSUP;
427 }
428 if (!check_event_name(arg)) {
429 semantic_error("%s is bad for event name -it must "
430 "follow C symbol-naming rule.\n", arg);
431 return -EINVAL;
432 }
433 pev->event = strdup(arg);
434 if (pev->event == NULL)
435 return -ENOMEM;
436 pev->group = NULL;
437 arg = tmp;
438 }
439
440 ptr = strpbrk(arg, ";:+@%");
441 if (ptr) {
442 nc = *ptr;
443 *ptr++ = '\0';
444 }
445
446 tmp = strdup(arg);
447 if (tmp == NULL)
448 return -ENOMEM;
449
450 /* Check arg is function or file and copy it */
451 if (strchr(tmp, '.')) /* File */
452 pp->file = tmp;
453 else /* Function */
454 pp->function = tmp;
455
456 /* Parse other options */
457 while (ptr) {
458 arg = ptr;
459 c = nc;
460 if (c == ';') { /* Lazy pattern must be the last part */
461 pp->lazy_line = strdup(arg);
462 if (pp->lazy_line == NULL)
463 return -ENOMEM;
464 break;
465 }
466 ptr = strpbrk(arg, ";:+@%");
467 if (ptr) {
468 nc = *ptr;
469 *ptr++ = '\0';
470 }
471 switch (c) {
472 case ':': /* Line number */
473 pp->line = strtoul(arg, &tmp, 0);
474 if (*tmp != '\0') {
475 semantic_error("There is non-digit char"
476 " in line number.\n");
477 return -EINVAL;
478 }
479 break;
480 case '+': /* Byte offset from a symbol */
481 pp->offset = strtoul(arg, &tmp, 0);
482 if (*tmp != '\0') {
483 semantic_error("There is non-digit character"
484 " in offset.\n");
485 return -EINVAL;
486 }
487 break;
488 case '@': /* File name */
489 if (pp->file) {
490 semantic_error("SRC@SRC is not allowed.\n");
491 return -EINVAL;
492 }
493 pp->file = strdup(arg);
494 if (pp->file == NULL)
495 return -ENOMEM;
496 break;
497 case '%': /* Probe places */
498 if (strcmp(arg, "return") == 0) {
499 pp->retprobe = 1;
500 } else { /* Others not supported yet */
501 semantic_error("%%%s is not supported.\n", arg);
502 return -ENOTSUP;
503 }
504 break;
505 default: /* Buggy case */
506 pr_err("This program has a bug at %s:%d.\n",
507 __FILE__, __LINE__);
508 return -ENOTSUP;
509 break;
510 }
511 }
512
513 /* Exclusion check */
514 if (pp->lazy_line && pp->line) {
515 semantic_error("Lazy pattern can't be used with line number.");
516 return -EINVAL;
517 }
518
519 if (pp->lazy_line && pp->offset) {
520 semantic_error("Lazy pattern can't be used with offset.");
521 return -EINVAL;
522 }
523
524 if (pp->line && pp->offset) {
525 semantic_error("Offset can't be used with line number.");
526 return -EINVAL;
527 }
528
529 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
530 semantic_error("File always requires line number or "
531 "lazy pattern.");
532 return -EINVAL;
533 }
534
535 if (pp->offset && !pp->function) {
536 semantic_error("Offset requires an entry function.");
537 return -EINVAL;
538 }
539
540 if (pp->retprobe && !pp->function) {
541 semantic_error("Return probe requires an entry function.");
542 return -EINVAL;
543 }
544
545 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
546 semantic_error("Offset/Line/Lazy pattern can't be used with "
547 "return probe.");
548 return -EINVAL;
549 }
550
551 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
552 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
553 pp->lazy_line);
554 return 0;
555 }
556
557 /* Parse perf-probe event argument */
558 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
559 {
560 char *tmp;
561 struct perf_probe_arg_field **fieldp;
562
563 pr_debug("parsing arg: %s into ", str);
564
565 tmp = strchr(str, '=');
566 if (tmp) {
567 arg->name = strndup(str, tmp - str);
568 if (arg->name == NULL)
569 return -ENOMEM;
570 pr_debug("name:%s ", arg->name);
571 str = tmp + 1;
572 }
573
574 tmp = strchr(str, ':');
575 if (tmp) { /* Type setting */
576 *tmp = '\0';
577 arg->type = strdup(tmp + 1);
578 if (arg->type == NULL)
579 return -ENOMEM;
580 pr_debug("type:%s ", arg->type);
581 }
582
583 tmp = strpbrk(str, "-.");
584 if (!is_c_varname(str) || !tmp) {
585 /* A variable, register, symbol or special value */
586 arg->var = strdup(str);
587 if (arg->var == NULL)
588 return -ENOMEM;
589 pr_debug("%s\n", arg->var);
590 return 0;
591 }
592
593 /* Structure fields */
594 arg->var = strndup(str, tmp - str);
595 if (arg->var == NULL)
596 return -ENOMEM;
597 pr_debug("%s, ", arg->var);
598 fieldp = &arg->field;
599
600 do {
601 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
602 if (*fieldp == NULL)
603 return -ENOMEM;
604 if (*tmp == '.') {
605 str = tmp + 1;
606 (*fieldp)->ref = false;
607 } else if (tmp[1] == '>') {
608 str = tmp + 2;
609 (*fieldp)->ref = true;
610 } else {
611 semantic_error("Argument parse error: %s\n", str);
612 return -EINVAL;
613 }
614
615 tmp = strpbrk(str, "-.");
616 if (tmp) {
617 (*fieldp)->name = strndup(str, tmp - str);
618 if ((*fieldp)->name == NULL)
619 return -ENOMEM;
620 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
621 fieldp = &(*fieldp)->next;
622 }
623 } while (tmp);
624 (*fieldp)->name = strdup(str);
625 if ((*fieldp)->name == NULL)
626 return -ENOMEM;
627 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
628
629 /* If no name is specified, set the last field name */
630 if (!arg->name) {
631 arg->name = strdup((*fieldp)->name);
632 if (arg->name == NULL)
633 return -ENOMEM;
634 }
635 return 0;
636 }
637
638 /* Parse perf-probe event command */
639 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
640 {
641 char **argv;
642 int argc, i, ret = 0;
643
644 argv = argv_split(cmd, &argc);
645 if (!argv) {
646 pr_debug("Failed to split arguments.\n");
647 return -ENOMEM;
648 }
649 if (argc - 1 > MAX_PROBE_ARGS) {
650 semantic_error("Too many probe arguments (%d).\n", argc - 1);
651 ret = -ERANGE;
652 goto out;
653 }
654 /* Parse probe point */
655 ret = parse_perf_probe_point(argv[0], pev);
656 if (ret < 0)
657 goto out;
658
659 /* Copy arguments and ensure return probe has no C argument */
660 pev->nargs = argc - 1;
661 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
662 if (pev->args == NULL) {
663 ret = -ENOMEM;
664 goto out;
665 }
666 for (i = 0; i < pev->nargs && ret >= 0; i++) {
667 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
668 if (ret >= 0 &&
669 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
670 semantic_error("You can't specify local variable for"
671 " kretprobe.\n");
672 ret = -EINVAL;
673 }
674 }
675 out:
676 argv_free(argv);
677
678 return ret;
679 }
680
681 /* Return true if this perf_probe_event requires debuginfo */
682 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
683 {
684 int i;
685
686 if (pev->point.file || pev->point.line || pev->point.lazy_line)
687 return true;
688
689 for (i = 0; i < pev->nargs; i++)
690 if (is_c_varname(pev->args[i].var))
691 return true;
692
693 return false;
694 }
695
696 /* Parse kprobe_events event into struct probe_point */
697 int parse_kprobe_trace_command(const char *cmd, struct kprobe_trace_event *tev)
698 {
699 struct kprobe_trace_point *tp = &tev->point;
700 char pr;
701 char *p;
702 int ret, i, argc;
703 char **argv;
704
705 pr_debug("Parsing kprobe_events: %s\n", cmd);
706 argv = argv_split(cmd, &argc);
707 if (!argv) {
708 pr_debug("Failed to split arguments.\n");
709 return -ENOMEM;
710 }
711 if (argc < 2) {
712 semantic_error("Too few probe arguments.\n");
713 ret = -ERANGE;
714 goto out;
715 }
716
717 /* Scan event and group name. */
718 ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
719 &pr, (float *)(void *)&tev->group,
720 (float *)(void *)&tev->event);
721 if (ret != 3) {
722 semantic_error("Failed to parse event name: %s\n", argv[0]);
723 ret = -EINVAL;
724 goto out;
725 }
726 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
727
728 tp->retprobe = (pr == 'r');
729
730 /* Scan function name and offset */
731 ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol,
732 &tp->offset);
733 if (ret == 1)
734 tp->offset = 0;
735
736 tev->nargs = argc - 2;
737 tev->args = zalloc(sizeof(struct kprobe_trace_arg) * tev->nargs);
738 if (tev->args == NULL) {
739 ret = -ENOMEM;
740 goto out;
741 }
742 for (i = 0; i < tev->nargs; i++) {
743 p = strchr(argv[i + 2], '=');
744 if (p) /* We don't need which register is assigned. */
745 *p++ = '\0';
746 else
747 p = argv[i + 2];
748 tev->args[i].name = strdup(argv[i + 2]);
749 /* TODO: parse regs and offset */
750 tev->args[i].value = strdup(p);
751 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
752 ret = -ENOMEM;
753 goto out;
754 }
755 }
756 ret = 0;
757 out:
758 argv_free(argv);
759 return ret;
760 }
761
762 /* Compose only probe arg */
763 int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
764 {
765 struct perf_probe_arg_field *field = pa->field;
766 int ret;
767 char *tmp = buf;
768
769 if (pa->name && pa->var)
770 ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
771 else
772 ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
773 if (ret <= 0)
774 goto error;
775 tmp += ret;
776 len -= ret;
777
778 while (field) {
779 ret = e_snprintf(tmp, len, "%s%s", field->ref ? "->" : ".",
780 field->name);
781 if (ret <= 0)
782 goto error;
783 tmp += ret;
784 len -= ret;
785 field = field->next;
786 }
787
788 if (pa->type) {
789 ret = e_snprintf(tmp, len, ":%s", pa->type);
790 if (ret <= 0)
791 goto error;
792 tmp += ret;
793 len -= ret;
794 }
795
796 return tmp - buf;
797 error:
798 pr_debug("Failed to synthesize perf probe argument: %s",
799 strerror(-ret));
800 return ret;
801 }
802
803 /* Compose only probe point (not argument) */
804 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
805 {
806 char *buf, *tmp;
807 char offs[32] = "", line[32] = "", file[32] = "";
808 int ret, len;
809
810 buf = zalloc(MAX_CMDLEN);
811 if (buf == NULL) {
812 ret = -ENOMEM;
813 goto error;
814 }
815 if (pp->offset) {
816 ret = e_snprintf(offs, 32, "+%lu", pp->offset);
817 if (ret <= 0)
818 goto error;
819 }
820 if (pp->line) {
821 ret = e_snprintf(line, 32, ":%d", pp->line);
822 if (ret <= 0)
823 goto error;
824 }
825 if (pp->file) {
826 len = strlen(pp->file) - 31;
827 if (len < 0)
828 len = 0;
829 tmp = strchr(pp->file + len, '/');
830 if (!tmp)
831 tmp = pp->file + len;
832 ret = e_snprintf(file, 32, "@%s", tmp + 1);
833 if (ret <= 0)
834 goto error;
835 }
836
837 if (pp->function)
838 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
839 offs, pp->retprobe ? "%return" : "", line,
840 file);
841 else
842 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
843 if (ret <= 0)
844 goto error;
845
846 return buf;
847 error:
848 pr_debug("Failed to synthesize perf probe point: %s",
849 strerror(-ret));
850 if (buf)
851 free(buf);
852 return NULL;
853 }
854
855 #if 0
856 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
857 {
858 char *buf;
859 int i, len, ret;
860
861 buf = synthesize_perf_probe_point(&pev->point);
862 if (!buf)
863 return NULL;
864
865 len = strlen(buf);
866 for (i = 0; i < pev->nargs; i++) {
867 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
868 pev->args[i].name);
869 if (ret <= 0) {
870 free(buf);
871 return NULL;
872 }
873 len += ret;
874 }
875
876 return buf;
877 }
878 #endif
879
880 static int __synthesize_kprobe_trace_arg_ref(struct kprobe_trace_arg_ref *ref,
881 char **buf, size_t *buflen,
882 int depth)
883 {
884 int ret;
885 if (ref->next) {
886 depth = __synthesize_kprobe_trace_arg_ref(ref->next, buf,
887 buflen, depth + 1);
888 if (depth < 0)
889 goto out;
890 }
891
892 ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
893 if (ret < 0)
894 depth = ret;
895 else {
896 *buf += ret;
897 *buflen -= ret;
898 }
899 out:
900 return depth;
901
902 }
903
904 static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg,
905 char *buf, size_t buflen)
906 {
907 int ret, depth = 0;
908 char *tmp = buf;
909
910 /* Argument name or separator */
911 if (arg->name)
912 ret = e_snprintf(buf, buflen, " %s=", arg->name);
913 else
914 ret = e_snprintf(buf, buflen, " ");
915 if (ret < 0)
916 return ret;
917 buf += ret;
918 buflen -= ret;
919
920 /* Dereferencing arguments */
921 if (arg->ref) {
922 depth = __synthesize_kprobe_trace_arg_ref(arg->ref, &buf,
923 &buflen, 1);
924 if (depth < 0)
925 return depth;
926 }
927
928 /* Print argument value */
929 ret = e_snprintf(buf, buflen, "%s", arg->value);
930 if (ret < 0)
931 return ret;
932 buf += ret;
933 buflen -= ret;
934
935 /* Closing */
936 while (depth--) {
937 ret = e_snprintf(buf, buflen, ")");
938 if (ret < 0)
939 return ret;
940 buf += ret;
941 buflen -= ret;
942 }
943 /* Print argument type */
944 if (arg->type) {
945 ret = e_snprintf(buf, buflen, ":%s", arg->type);
946 if (ret <= 0)
947 return ret;
948 buf += ret;
949 }
950
951 return buf - tmp;
952 }
953
954 char *synthesize_kprobe_trace_command(struct kprobe_trace_event *tev)
955 {
956 struct kprobe_trace_point *tp = &tev->point;
957 char *buf;
958 int i, len, ret;
959
960 buf = zalloc(MAX_CMDLEN);
961 if (buf == NULL)
962 return NULL;
963
964 len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu",
965 tp->retprobe ? 'r' : 'p',
966 tev->group, tev->event,
967 tp->symbol, tp->offset);
968 if (len <= 0)
969 goto error;
970
971 for (i = 0; i < tev->nargs; i++) {
972 ret = synthesize_kprobe_trace_arg(&tev->args[i], buf + len,
973 MAX_CMDLEN - len);
974 if (ret <= 0)
975 goto error;
976 len += ret;
977 }
978
979 return buf;
980 error:
981 free(buf);
982 return NULL;
983 }
984
985 int convert_to_perf_probe_event(struct kprobe_trace_event *tev,
986 struct perf_probe_event *pev)
987 {
988 char buf[64] = "";
989 int i, ret;
990
991 /* Convert event/group name */
992 pev->event = strdup(tev->event);
993 pev->group = strdup(tev->group);
994 if (pev->event == NULL || pev->group == NULL)
995 return -ENOMEM;
996
997 /* Convert trace_point to probe_point */
998 ret = convert_to_perf_probe_point(&tev->point, &pev->point);
999 if (ret < 0)
1000 return ret;
1001
1002 /* Convert trace_arg to probe_arg */
1003 pev->nargs = tev->nargs;
1004 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1005 if (pev->args == NULL)
1006 return -ENOMEM;
1007 for (i = 0; i < tev->nargs && ret >= 0; i++) {
1008 if (tev->args[i].name)
1009 pev->args[i].name = strdup(tev->args[i].name);
1010 else {
1011 ret = synthesize_kprobe_trace_arg(&tev->args[i],
1012 buf, 64);
1013 pev->args[i].name = strdup(buf);
1014 }
1015 if (pev->args[i].name == NULL && ret >= 0)
1016 ret = -ENOMEM;
1017 }
1018
1019 if (ret < 0)
1020 clear_perf_probe_event(pev);
1021
1022 return ret;
1023 }
1024
1025 void clear_perf_probe_event(struct perf_probe_event *pev)
1026 {
1027 struct perf_probe_point *pp = &pev->point;
1028 struct perf_probe_arg_field *field, *next;
1029 int i;
1030
1031 if (pev->event)
1032 free(pev->event);
1033 if (pev->group)
1034 free(pev->group);
1035 if (pp->file)
1036 free(pp->file);
1037 if (pp->function)
1038 free(pp->function);
1039 if (pp->lazy_line)
1040 free(pp->lazy_line);
1041 for (i = 0; i < pev->nargs; i++) {
1042 if (pev->args[i].name)
1043 free(pev->args[i].name);
1044 if (pev->args[i].var)
1045 free(pev->args[i].var);
1046 if (pev->args[i].type)
1047 free(pev->args[i].type);
1048 field = pev->args[i].field;
1049 while (field) {
1050 next = field->next;
1051 if (field->name)
1052 free(field->name);
1053 free(field);
1054 field = next;
1055 }
1056 }
1057 if (pev->args)
1058 free(pev->args);
1059 memset(pev, 0, sizeof(*pev));
1060 }
1061
1062 void clear_kprobe_trace_event(struct kprobe_trace_event *tev)
1063 {
1064 struct kprobe_trace_arg_ref *ref, *next;
1065 int i;
1066
1067 if (tev->event)
1068 free(tev->event);
1069 if (tev->group)
1070 free(tev->group);
1071 if (tev->point.symbol)
1072 free(tev->point.symbol);
1073 for (i = 0; i < tev->nargs; i++) {
1074 if (tev->args[i].name)
1075 free(tev->args[i].name);
1076 if (tev->args[i].value)
1077 free(tev->args[i].value);
1078 if (tev->args[i].type)
1079 free(tev->args[i].type);
1080 ref = tev->args[i].ref;
1081 while (ref) {
1082 next = ref->next;
1083 free(ref);
1084 ref = next;
1085 }
1086 }
1087 if (tev->args)
1088 free(tev->args);
1089 memset(tev, 0, sizeof(*tev));
1090 }
1091
1092 static int open_kprobe_events(bool readwrite)
1093 {
1094 char buf[PATH_MAX];
1095 const char *__debugfs;
1096 int ret;
1097
1098 __debugfs = debugfs_find_mountpoint();
1099 if (__debugfs == NULL) {
1100 pr_warning("Debugfs is not mounted.\n");
1101 return -ENOENT;
1102 }
1103
1104 ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs);
1105 if (ret >= 0) {
1106 pr_debug("Opening %s write=%d\n", buf, readwrite);
1107 if (readwrite && !probe_event_dry_run)
1108 ret = open(buf, O_RDWR, O_APPEND);
1109 else
1110 ret = open(buf, O_RDONLY, 0);
1111 }
1112
1113 if (ret < 0) {
1114 if (errno == ENOENT)
1115 pr_warning("kprobe_events file does not exist - please"
1116 " rebuild kernel with CONFIG_KPROBE_EVENT.\n");
1117 else
1118 pr_warning("Failed to open kprobe_events file: %s\n",
1119 strerror(errno));
1120 }
1121 return ret;
1122 }
1123
1124 /* Get raw string list of current kprobe_events */
1125 static struct strlist *get_kprobe_trace_command_rawlist(int fd)
1126 {
1127 int ret, idx;
1128 FILE *fp;
1129 char buf[MAX_CMDLEN];
1130 char *p;
1131 struct strlist *sl;
1132
1133 sl = strlist__new(true, NULL);
1134
1135 fp = fdopen(dup(fd), "r");
1136 while (!feof(fp)) {
1137 p = fgets(buf, MAX_CMDLEN, fp);
1138 if (!p)
1139 break;
1140
1141 idx = strlen(p) - 1;
1142 if (p[idx] == '\n')
1143 p[idx] = '\0';
1144 ret = strlist__add(sl, buf);
1145 if (ret < 0) {
1146 pr_debug("strlist__add failed: %s\n", strerror(-ret));
1147 strlist__delete(sl);
1148 return NULL;
1149 }
1150 }
1151 fclose(fp);
1152
1153 return sl;
1154 }
1155
1156 /* Show an event */
1157 static int show_perf_probe_event(struct perf_probe_event *pev)
1158 {
1159 int i, ret;
1160 char buf[128];
1161 char *place;
1162
1163 /* Synthesize only event probe point */
1164 place = synthesize_perf_probe_point(&pev->point);
1165 if (!place)
1166 return -EINVAL;
1167
1168 ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
1169 if (ret < 0)
1170 return ret;
1171
1172 printf(" %-20s (on %s", buf, place);
1173
1174 if (pev->nargs > 0) {
1175 printf(" with");
1176 for (i = 0; i < pev->nargs; i++) {
1177 ret = synthesize_perf_probe_arg(&pev->args[i],
1178 buf, 128);
1179 if (ret < 0)
1180 break;
1181 printf(" %s", buf);
1182 }
1183 }
1184 printf(")\n");
1185 free(place);
1186 return ret;
1187 }
1188
1189 /* List up current perf-probe events */
1190 int show_perf_probe_events(void)
1191 {
1192 int fd, ret;
1193 struct kprobe_trace_event tev;
1194 struct perf_probe_event pev;
1195 struct strlist *rawlist;
1196 struct str_node *ent;
1197
1198 setup_pager();
1199 ret = init_vmlinux();
1200 if (ret < 0)
1201 return ret;
1202
1203 memset(&tev, 0, sizeof(tev));
1204 memset(&pev, 0, sizeof(pev));
1205
1206 fd = open_kprobe_events(false);
1207 if (fd < 0)
1208 return fd;
1209
1210 rawlist = get_kprobe_trace_command_rawlist(fd);
1211 close(fd);
1212 if (!rawlist)
1213 return -ENOENT;
1214
1215 strlist__for_each(ent, rawlist) {
1216 ret = parse_kprobe_trace_command(ent->s, &tev);
1217 if (ret >= 0) {
1218 ret = convert_to_perf_probe_event(&tev, &pev);
1219 if (ret >= 0)
1220 ret = show_perf_probe_event(&pev);
1221 }
1222 clear_perf_probe_event(&pev);
1223 clear_kprobe_trace_event(&tev);
1224 if (ret < 0)
1225 break;
1226 }
1227 strlist__delete(rawlist);
1228
1229 return ret;
1230 }
1231
1232 /* Get current perf-probe event names */
1233 static struct strlist *get_kprobe_trace_event_names(int fd, bool include_group)
1234 {
1235 char buf[128];
1236 struct strlist *sl, *rawlist;
1237 struct str_node *ent;
1238 struct kprobe_trace_event tev;
1239 int ret = 0;
1240
1241 memset(&tev, 0, sizeof(tev));
1242
1243 rawlist = get_kprobe_trace_command_rawlist(fd);
1244 sl = strlist__new(true, NULL);
1245 strlist__for_each(ent, rawlist) {
1246 ret = parse_kprobe_trace_command(ent->s, &tev);
1247 if (ret < 0)
1248 break;
1249 if (include_group) {
1250 ret = e_snprintf(buf, 128, "%s:%s", tev.group,
1251 tev.event);
1252 if (ret >= 0)
1253 ret = strlist__add(sl, buf);
1254 } else
1255 ret = strlist__add(sl, tev.event);
1256 clear_kprobe_trace_event(&tev);
1257 if (ret < 0)
1258 break;
1259 }
1260 strlist__delete(rawlist);
1261
1262 if (ret < 0) {
1263 strlist__delete(sl);
1264 return NULL;
1265 }
1266 return sl;
1267 }
1268
1269 static int write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev)
1270 {
1271 int ret = 0;
1272 char *buf = synthesize_kprobe_trace_command(tev);
1273
1274 if (!buf) {
1275 pr_debug("Failed to synthesize kprobe trace event.\n");
1276 return -EINVAL;
1277 }
1278
1279 pr_debug("Writing event: %s\n", buf);
1280 if (!probe_event_dry_run) {
1281 ret = write(fd, buf, strlen(buf));
1282 if (ret <= 0)
1283 pr_warning("Failed to write event: %s\n",
1284 strerror(errno));
1285 }
1286 free(buf);
1287 return ret;
1288 }
1289
1290 static int get_new_event_name(char *buf, size_t len, const char *base,
1291 struct strlist *namelist, bool allow_suffix)
1292 {
1293 int i, ret;
1294
1295 /* Try no suffix */
1296 ret = e_snprintf(buf, len, "%s", base);
1297 if (ret < 0) {
1298 pr_debug("snprintf() failed: %s\n", strerror(-ret));
1299 return ret;
1300 }
1301 if (!strlist__has_entry(namelist, buf))
1302 return 0;
1303
1304 if (!allow_suffix) {
1305 pr_warning("Error: event \"%s\" already exists. "
1306 "(Use -f to force duplicates.)\n", base);
1307 return -EEXIST;
1308 }
1309
1310 /* Try to add suffix */
1311 for (i = 1; i < MAX_EVENT_INDEX; i++) {
1312 ret = e_snprintf(buf, len, "%s_%d", base, i);
1313 if (ret < 0) {
1314 pr_debug("snprintf() failed: %s\n", strerror(-ret));
1315 return ret;
1316 }
1317 if (!strlist__has_entry(namelist, buf))
1318 break;
1319 }
1320 if (i == MAX_EVENT_INDEX) {
1321 pr_warning("Too many events are on the same function.\n");
1322 ret = -ERANGE;
1323 }
1324
1325 return ret;
1326 }
1327
1328 static int __add_kprobe_trace_events(struct perf_probe_event *pev,
1329 struct kprobe_trace_event *tevs,
1330 int ntevs, bool allow_suffix)
1331 {
1332 int i, fd, ret;
1333 struct kprobe_trace_event *tev = NULL;
1334 char buf[64];
1335 const char *event, *group;
1336 struct strlist *namelist;
1337
1338 fd = open_kprobe_events(true);
1339 if (fd < 0)
1340 return fd;
1341 /* Get current event names */
1342 namelist = get_kprobe_trace_event_names(fd, false);
1343 if (!namelist) {
1344 pr_debug("Failed to get current event list.\n");
1345 return -EIO;
1346 }
1347
1348 ret = 0;
1349 printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":");
1350 for (i = 0; i < ntevs; i++) {
1351 tev = &tevs[i];
1352 if (pev->event)
1353 event = pev->event;
1354 else
1355 if (pev->point.function)
1356 event = pev->point.function;
1357 else
1358 event = tev->point.symbol;
1359 if (pev->group)
1360 group = pev->group;
1361 else
1362 group = PERFPROBE_GROUP;
1363
1364 /* Get an unused new event name */
1365 ret = get_new_event_name(buf, 64, event,
1366 namelist, allow_suffix);
1367 if (ret < 0)
1368 break;
1369 event = buf;
1370
1371 tev->event = strdup(event);
1372 tev->group = strdup(group);
1373 if (tev->event == NULL || tev->group == NULL) {
1374 ret = -ENOMEM;
1375 break;
1376 }
1377 ret = write_kprobe_trace_event(fd, tev);
1378 if (ret < 0)
1379 break;
1380 /* Add added event name to namelist */
1381 strlist__add(namelist, event);
1382
1383 /* Trick here - save current event/group */
1384 event = pev->event;
1385 group = pev->group;
1386 pev->event = tev->event;
1387 pev->group = tev->group;
1388 show_perf_probe_event(pev);
1389 /* Trick here - restore current event/group */
1390 pev->event = (char *)event;
1391 pev->group = (char *)group;
1392
1393 /*
1394 * Probes after the first probe which comes from same
1395 * user input are always allowed to add suffix, because
1396 * there might be several addresses corresponding to
1397 * one code line.
1398 */
1399 allow_suffix = true;
1400 }
1401
1402 if (ret >= 0) {
1403 /* Show how to use the event. */
1404 printf("\nYou can now use it on all perf tools, such as:\n\n");
1405 printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group,
1406 tev->event);
1407 }
1408
1409 strlist__delete(namelist);
1410 close(fd);
1411 return ret;
1412 }
1413
1414 static int convert_to_kprobe_trace_events(struct perf_probe_event *pev,
1415 struct kprobe_trace_event **tevs,
1416 int max_tevs)
1417 {
1418 struct symbol *sym;
1419 int ret = 0, i;
1420 struct kprobe_trace_event *tev;
1421
1422 /* Convert perf_probe_event with debuginfo */
1423 ret = try_to_find_kprobe_trace_events(pev, tevs, max_tevs);
1424 if (ret != 0)
1425 return ret;
1426
1427 /* Allocate trace event buffer */
1428 tev = *tevs = zalloc(sizeof(struct kprobe_trace_event));
1429 if (tev == NULL)
1430 return -ENOMEM;
1431
1432 /* Copy parameters */
1433 tev->point.symbol = strdup(pev->point.function);
1434 if (tev->point.symbol == NULL) {
1435 ret = -ENOMEM;
1436 goto error;
1437 }
1438 tev->point.offset = pev->point.offset;
1439 tev->nargs = pev->nargs;
1440 if (tev->nargs) {
1441 tev->args = zalloc(sizeof(struct kprobe_trace_arg)
1442 * tev->nargs);
1443 if (tev->args == NULL) {
1444 ret = -ENOMEM;
1445 goto error;
1446 }
1447 for (i = 0; i < tev->nargs; i++) {
1448 if (pev->args[i].name) {
1449 tev->args[i].name = strdup(pev->args[i].name);
1450 if (tev->args[i].name == NULL) {
1451 ret = -ENOMEM;
1452 goto error;
1453 }
1454 }
1455 tev->args[i].value = strdup(pev->args[i].var);
1456 if (tev->args[i].value == NULL) {
1457 ret = -ENOMEM;
1458 goto error;
1459 }
1460 if (pev->args[i].type) {
1461 tev->args[i].type = strdup(pev->args[i].type);
1462 if (tev->args[i].type == NULL) {
1463 ret = -ENOMEM;
1464 goto error;
1465 }
1466 }
1467 }
1468 }
1469
1470 /* Currently just checking function name from symbol map */
1471 sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION],
1472 tev->point.symbol, NULL);
1473 if (!sym) {
1474 pr_warning("Kernel symbol \'%s\' not found.\n",
1475 tev->point.symbol);
1476 ret = -ENOENT;
1477 goto error;
1478 }
1479
1480 return 1;
1481 error:
1482 clear_kprobe_trace_event(tev);
1483 free(tev);
1484 *tevs = NULL;
1485 return ret;
1486 }
1487
1488 struct __event_package {
1489 struct perf_probe_event *pev;
1490 struct kprobe_trace_event *tevs;
1491 int ntevs;
1492 };
1493
1494 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
1495 bool force_add, int max_tevs)
1496 {
1497 int i, j, ret;
1498 struct __event_package *pkgs;
1499
1500 pkgs = zalloc(sizeof(struct __event_package) * npevs);
1501 if (pkgs == NULL)
1502 return -ENOMEM;
1503
1504 /* Init vmlinux path */
1505 ret = init_vmlinux();
1506 if (ret < 0)
1507 return ret;
1508
1509 /* Loop 1: convert all events */
1510 for (i = 0; i < npevs; i++) {
1511 pkgs[i].pev = &pevs[i];
1512 /* Convert with or without debuginfo */
1513 ret = convert_to_kprobe_trace_events(pkgs[i].pev,
1514 &pkgs[i].tevs, max_tevs);
1515 if (ret < 0)
1516 goto end;
1517 pkgs[i].ntevs = ret;
1518 }
1519
1520 /* Loop 2: add all events */
1521 for (i = 0; i < npevs && ret >= 0; i++)
1522 ret = __add_kprobe_trace_events(pkgs[i].pev, pkgs[i].tevs,
1523 pkgs[i].ntevs, force_add);
1524 end:
1525 /* Loop 3: cleanup trace events */
1526 for (i = 0; i < npevs; i++)
1527 for (j = 0; j < pkgs[i].ntevs; j++)
1528 clear_kprobe_trace_event(&pkgs[i].tevs[j]);
1529
1530 return ret;
1531 }
1532
1533 static int __del_trace_kprobe_event(int fd, struct str_node *ent)
1534 {
1535 char *p;
1536 char buf[128];
1537 int ret;
1538
1539 /* Convert from perf-probe event to trace-kprobe event */
1540 ret = e_snprintf(buf, 128, "-:%s", ent->s);
1541 if (ret < 0)
1542 goto error;
1543
1544 p = strchr(buf + 2, ':');
1545 if (!p) {
1546 pr_debug("Internal error: %s should have ':' but not.\n",
1547 ent->s);
1548 ret = -ENOTSUP;
1549 goto error;
1550 }
1551 *p = '/';
1552
1553 pr_debug("Writing event: %s\n", buf);
1554 ret = write(fd, buf, strlen(buf));
1555 if (ret < 0)
1556 goto error;
1557
1558 printf("Remove event: %s\n", ent->s);
1559 return 0;
1560 error:
1561 pr_warning("Failed to delete event: %s\n", strerror(-ret));
1562 return ret;
1563 }
1564
1565 static int del_trace_kprobe_event(int fd, const char *group,
1566 const char *event, struct strlist *namelist)
1567 {
1568 char buf[128];
1569 struct str_node *ent, *n;
1570 int found = 0, ret = 0;
1571
1572 ret = e_snprintf(buf, 128, "%s:%s", group, event);
1573 if (ret < 0) {
1574 pr_err("Failed to copy event.");
1575 return ret;
1576 }
1577
1578 if (strpbrk(buf, "*?")) { /* Glob-exp */
1579 strlist__for_each_safe(ent, n, namelist)
1580 if (strglobmatch(ent->s, buf)) {
1581 found++;
1582 ret = __del_trace_kprobe_event(fd, ent);
1583 if (ret < 0)
1584 break;
1585 strlist__remove(namelist, ent);
1586 }
1587 } else {
1588 ent = strlist__find(namelist, buf);
1589 if (ent) {
1590 found++;
1591 ret = __del_trace_kprobe_event(fd, ent);
1592 if (ret >= 0)
1593 strlist__remove(namelist, ent);
1594 }
1595 }
1596 if (found == 0 && ret >= 0)
1597 pr_info("Info: Event \"%s\" does not exist.\n", buf);
1598
1599 return ret;
1600 }
1601
1602 int del_perf_probe_events(struct strlist *dellist)
1603 {
1604 int fd, ret = 0;
1605 const char *group, *event;
1606 char *p, *str;
1607 struct str_node *ent;
1608 struct strlist *namelist;
1609
1610 fd = open_kprobe_events(true);
1611 if (fd < 0)
1612 return fd;
1613
1614 /* Get current event names */
1615 namelist = get_kprobe_trace_event_names(fd, true);
1616 if (namelist == NULL)
1617 return -EINVAL;
1618
1619 strlist__for_each(ent, dellist) {
1620 str = strdup(ent->s);
1621 if (str == NULL) {
1622 ret = -ENOMEM;
1623 break;
1624 }
1625 pr_debug("Parsing: %s\n", str);
1626 p = strchr(str, ':');
1627 if (p) {
1628 group = str;
1629 *p = '\0';
1630 event = p + 1;
1631 } else {
1632 group = "*";
1633 event = str;
1634 }
1635 pr_debug("Group: %s, Event: %s\n", group, event);
1636 ret = del_trace_kprobe_event(fd, group, event, namelist);
1637 free(str);
1638 if (ret < 0)
1639 break;
1640 }
1641 strlist__delete(namelist);
1642 close(fd);
1643
1644 return ret;
1645 }
1646
CRIS linux kernel tree