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4445a1e7052f4e4b1b1ed3c883baea00a9a4f044
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / tools / perf / util / probe-event.c
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 /*
199 * Find a src file from a DWARF tag path. Prepend optional source path prefix
200 * and chop off leading directories that do not exist. Result is passed back as
201 * a newly allocated path on success.
202 * Return 0 if file was found and readable, -errno otherwise.
203 */
204 static int get_real_path(const char *raw_path, const char *comp_dir,
205 char **new_path)
206 {
207 const char *prefix = symbol_conf.source_prefix;
208
209 if (!prefix) {
210 if (raw_path[0] != '/' && comp_dir)
211 /* If not an absolute path, try to use comp_dir */
212 prefix = comp_dir;
213 else {
214 if (access(raw_path, R_OK) == 0) {
215 *new_path = strdup(raw_path);
216 return 0;
217 } else
218 return -errno;
219 }
220 }
221
222 *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2));
223 if (!*new_path)
224 return -ENOMEM;
225
226 for (;;) {
227 sprintf(*new_path, "%s/%s", prefix, raw_path);
228
229 if (access(*new_path, R_OK) == 0)
230 return 0;
231
232 if (!symbol_conf.source_prefix)
233 /* In case of searching comp_dir, don't retry */
234 return -errno;
235
236 switch (errno) {
237 case ENAMETOOLONG:
238 case ENOENT:
239 case EROFS:
240 case EFAULT:
241 raw_path = strchr(++raw_path, '/');
242 if (!raw_path) {
243 free(*new_path);
244 *new_path = NULL;
245 return -ENOENT;
246 }
247 continue;
248
249 default:
250 free(*new_path);
251 *new_path = NULL;
252 return -errno;
253 }
254 }
255 }
256
257 #define LINEBUF_SIZE 256
258 #define NR_ADDITIONAL_LINES 2
259
260 static int show_one_line(FILE *fp, int l, bool skip, bool show_num)
261 {
262 char buf[LINEBUF_SIZE];
263 const char *color = PERF_COLOR_BLUE;
264
265 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
266 goto error;
267 if (!skip) {
268 if (show_num)
269 fprintf(stdout, "%7d %s", l, buf);
270 else
271 color_fprintf(stdout, color, " %s", buf);
272 }
273
274 while (strlen(buf) == LINEBUF_SIZE - 1 &&
275 buf[LINEBUF_SIZE - 2] != '\n') {
276 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
277 goto error;
278 if (!skip) {
279 if (show_num)
280 fprintf(stdout, "%s", buf);
281 else
282 color_fprintf(stdout, color, "%s", buf);
283 }
284 }
285
286 return 0;
287 error:
288 if (feof(fp))
289 pr_warning("Source file is shorter than expected.\n");
290 else
291 pr_warning("File read error: %s\n", strerror(errno));
292
293 return -1;
294 }
295
296 /*
297 * Show line-range always requires debuginfo to find source file and
298 * line number.
299 */
300 int show_line_range(struct line_range *lr)
301 {
302 int l = 1;
303 struct line_node *ln;
304 FILE *fp;
305 int fd, ret;
306 char *tmp;
307
308 /* Search a line range */
309 ret = init_vmlinux();
310 if (ret < 0)
311 return ret;
312
313 fd = open_vmlinux();
314 if (fd < 0) {
315 pr_warning("Failed to open debuginfo file.\n");
316 return fd;
317 }
318
319 ret = find_line_range(fd, lr);
320 close(fd);
321 if (ret == 0) {
322 pr_warning("Specified source line is not found.\n");
323 return -ENOENT;
324 } else if (ret < 0) {
325 pr_warning("Debuginfo analysis failed. (%d)\n", ret);
326 return ret;
327 }
328
329 /* Convert source file path */
330 tmp = lr->path;
331 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
332 free(tmp); /* Free old path */
333 if (ret < 0) {
334 pr_warning("Failed to find source file. (%d)\n", ret);
335 return ret;
336 }
337
338 setup_pager();
339
340 if (lr->function)
341 fprintf(stdout, "<%s:%d>\n", lr->function,
342 lr->start - lr->offset);
343 else
344 fprintf(stdout, "<%s:%d>\n", lr->file, lr->start);
345
346 fp = fopen(lr->path, "r");
347 if (fp == NULL) {
348 pr_warning("Failed to open %s: %s\n", lr->path,
349 strerror(errno));
350 return -errno;
351 }
352 /* Skip to starting line number */
353 while (l < lr->start && ret >= 0)
354 ret = show_one_line(fp, l++, true, false);
355 if (ret < 0)
356 goto end;
357
358 list_for_each_entry(ln, &lr->line_list, list) {
359 while (ln->line > l && ret >= 0)
360 ret = show_one_line(fp, (l++) - lr->offset,
361 false, false);
362 if (ret >= 0)
363 ret = show_one_line(fp, (l++) - lr->offset,
364 false, true);
365 if (ret < 0)
366 goto end;
367 }
368
369 if (lr->end == INT_MAX)
370 lr->end = l + NR_ADDITIONAL_LINES;
371 while (l <= lr->end && !feof(fp) && ret >= 0)
372 ret = show_one_line(fp, (l++) - lr->offset, false, false);
373 end:
374 fclose(fp);
375 return ret;
376 }
377
378 #else /* !DWARF_SUPPORT */
379
380 static int convert_to_perf_probe_point(struct kprobe_trace_point *tp,
381 struct perf_probe_point *pp)
382 {
383 pp->function = strdup(tp->symbol);
384 if (pp->function == NULL)
385 return -ENOMEM;
386 pp->offset = tp->offset;
387 pp->retprobe = tp->retprobe;
388
389 return 0;
390 }
391
392 static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
393 struct kprobe_trace_event **tevs __unused,
394 int max_tevs __unused)
395 {
396 if (perf_probe_event_need_dwarf(pev)) {
397 pr_warning("Debuginfo-analysis is not supported.\n");
398 return -ENOSYS;
399 }
400 return 0;
401 }
402
403 int show_line_range(struct line_range *lr __unused)
404 {
405 pr_warning("Debuginfo-analysis is not supported.\n");
406 return -ENOSYS;
407 }
408
409 #endif
410
411 int parse_line_range_desc(const char *arg, struct line_range *lr)
412 {
413 const char *ptr;
414 char *tmp;
415 /*
416 * <Syntax>
417 * SRC:SLN[+NUM|-ELN]
418 * FUNC[:SLN[+NUM|-ELN]]
419 */
420 ptr = strchr(arg, ':');
421 if (ptr) {
422 lr->start = (int)strtoul(ptr + 1, &tmp, 0);
423 if (*tmp == '+') {
424 lr->end = lr->start + (int)strtoul(tmp + 1, &tmp, 0);
425 lr->end--; /*
426 * Adjust the number of lines here.
427 * If the number of lines == 1, the
428 * the end of line should be equal to
429 * the start of line.
430 */
431 } else if (*tmp == '-')
432 lr->end = (int)strtoul(tmp + 1, &tmp, 0);
433 else
434 lr->end = INT_MAX;
435 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
436 if (lr->start > lr->end) {
437 semantic_error("Start line must be smaller"
438 " than end line.\n");
439 return -EINVAL;
440 }
441 if (*tmp != '\0') {
442 semantic_error("Tailing with invalid character '%d'.\n",
443 *tmp);
444 return -EINVAL;
445 }
446 tmp = strndup(arg, (ptr - arg));
447 } else {
448 tmp = strdup(arg);
449 lr->end = INT_MAX;
450 }
451
452 if (tmp == NULL)
453 return -ENOMEM;
454
455 if (strchr(tmp, '.'))
456 lr->file = tmp;
457 else
458 lr->function = tmp;
459
460 return 0;
461 }
462
463 /* Check the name is good for event/group */
464 static bool check_event_name(const char *name)
465 {
466 if (!isalpha(*name) && *name != '_')
467 return false;
468 while (*++name != '\0') {
469 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
470 return false;
471 }
472 return true;
473 }
474
475 /* Parse probepoint definition. */
476 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
477 {
478 struct perf_probe_point *pp = &pev->point;
479 char *ptr, *tmp;
480 char c, nc = 0;
481 /*
482 * <Syntax>
483 * perf probe [EVENT=]SRC[:LN|;PTN]
484 * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
485 *
486 * TODO:Group name support
487 */
488
489 ptr = strpbrk(arg, ";=@+%");
490 if (ptr && *ptr == '=') { /* Event name */
491 *ptr = '\0';
492 tmp = ptr + 1;
493 if (strchr(arg, ':')) {
494 semantic_error("Group name is not supported yet.\n");
495 return -ENOTSUP;
496 }
497 if (!check_event_name(arg)) {
498 semantic_error("%s is bad for event name -it must "
499 "follow C symbol-naming rule.\n", arg);
500 return -EINVAL;
501 }
502 pev->event = strdup(arg);
503 if (pev->event == NULL)
504 return -ENOMEM;
505 pev->group = NULL;
506 arg = tmp;
507 }
508
509 ptr = strpbrk(arg, ";:+@%");
510 if (ptr) {
511 nc = *ptr;
512 *ptr++ = '\0';
513 }
514
515 tmp = strdup(arg);
516 if (tmp == NULL)
517 return -ENOMEM;
518
519 /* Check arg is function or file and copy it */
520 if (strchr(tmp, '.')) /* File */
521 pp->file = tmp;
522 else /* Function */
523 pp->function = tmp;
524
525 /* Parse other options */
526 while (ptr) {
527 arg = ptr;
528 c = nc;
529 if (c == ';') { /* Lazy pattern must be the last part */
530 pp->lazy_line = strdup(arg);
531 if (pp->lazy_line == NULL)
532 return -ENOMEM;
533 break;
534 }
535 ptr = strpbrk(arg, ";:+@%");
536 if (ptr) {
537 nc = *ptr;
538 *ptr++ = '\0';
539 }
540 switch (c) {
541 case ':': /* Line number */
542 pp->line = strtoul(arg, &tmp, 0);
543 if (*tmp != '\0') {
544 semantic_error("There is non-digit char"
545 " in line number.\n");
546 return -EINVAL;
547 }
548 break;
549 case '+': /* Byte offset from a symbol */
550 pp->offset = strtoul(arg, &tmp, 0);
551 if (*tmp != '\0') {
552 semantic_error("There is non-digit character"
553 " in offset.\n");
554 return -EINVAL;
555 }
556 break;
557 case '@': /* File name */
558 if (pp->file) {
559 semantic_error("SRC@SRC is not allowed.\n");
560 return -EINVAL;
561 }
562 pp->file = strdup(arg);
563 if (pp->file == NULL)
564 return -ENOMEM;
565 break;
566 case '%': /* Probe places */
567 if (strcmp(arg, "return") == 0) {
568 pp->retprobe = 1;
569 } else { /* Others not supported yet */
570 semantic_error("%%%s is not supported.\n", arg);
571 return -ENOTSUP;
572 }
573 break;
574 default: /* Buggy case */
575 pr_err("This program has a bug at %s:%d.\n",
576 __FILE__, __LINE__);
577 return -ENOTSUP;
578 break;
579 }
580 }
581
582 /* Exclusion check */
583 if (pp->lazy_line && pp->line) {
584 semantic_error("Lazy pattern can't be used with line number.");
585 return -EINVAL;
586 }
587
588 if (pp->lazy_line && pp->offset) {
589 semantic_error("Lazy pattern can't be used with offset.");
590 return -EINVAL;
591 }
592
593 if (pp->line && pp->offset) {
594 semantic_error("Offset can't be used with line number.");
595 return -EINVAL;
596 }
597
598 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
599 semantic_error("File always requires line number or "
600 "lazy pattern.");
601 return -EINVAL;
602 }
603
604 if (pp->offset && !pp->function) {
605 semantic_error("Offset requires an entry function.");
606 return -EINVAL;
607 }
608
609 if (pp->retprobe && !pp->function) {
610 semantic_error("Return probe requires an entry function.");
611 return -EINVAL;
612 }
613
614 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
615 semantic_error("Offset/Line/Lazy pattern can't be used with "
616 "return probe.");
617 return -EINVAL;
618 }
619
620 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
621 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
622 pp->lazy_line);
623 return 0;
624 }
625
626 /* Parse perf-probe event argument */
627 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
628 {
629 char *tmp, *goodname;
630 struct perf_probe_arg_field **fieldp;
631
632 pr_debug("parsing arg: %s into ", str);
633
634 tmp = strchr(str, '=');
635 if (tmp) {
636 arg->name = strndup(str, tmp - str);
637 if (arg->name == NULL)
638 return -ENOMEM;
639 pr_debug("name:%s ", arg->name);
640 str = tmp + 1;
641 }
642
643 tmp = strchr(str, ':');
644 if (tmp) { /* Type setting */
645 *tmp = '\0';
646 arg->type = strdup(tmp + 1);
647 if (arg->type == NULL)
648 return -ENOMEM;
649 pr_debug("type:%s ", arg->type);
650 }
651
652 tmp = strpbrk(str, "-.[");
653 if (!is_c_varname(str) || !tmp) {
654 /* A variable, register, symbol or special value */
655 arg->var = strdup(str);
656 if (arg->var == NULL)
657 return -ENOMEM;
658 pr_debug("%s\n", arg->var);
659 return 0;
660 }
661
662 /* Structure fields or array element */
663 arg->var = strndup(str, tmp - str);
664 if (arg->var == NULL)
665 return -ENOMEM;
666 goodname = arg->var;
667 pr_debug("%s, ", arg->var);
668 fieldp = &arg->field;
669
670 do {
671 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
672 if (*fieldp == NULL)
673 return -ENOMEM;
674 if (*tmp == '[') { /* Array */
675 str = tmp;
676 (*fieldp)->index = strtol(str + 1, &tmp, 0);
677 (*fieldp)->ref = true;
678 if (*tmp != ']' || tmp == str + 1) {
679 semantic_error("Array index must be a"
680 " number.\n");
681 return -EINVAL;
682 }
683 tmp++;
684 if (*tmp == '\0')
685 tmp = NULL;
686 } else { /* Structure */
687 if (*tmp == '.') {
688 str = tmp + 1;
689 (*fieldp)->ref = false;
690 } else if (tmp[1] == '>') {
691 str = tmp + 2;
692 (*fieldp)->ref = true;
693 } else {
694 semantic_error("Argument parse error: %s\n",
695 str);
696 return -EINVAL;
697 }
698 tmp = strpbrk(str, "-.[");
699 }
700 if (tmp) {
701 (*fieldp)->name = strndup(str, tmp - str);
702 if ((*fieldp)->name == NULL)
703 return -ENOMEM;
704 if (*str != '[')
705 goodname = (*fieldp)->name;
706 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
707 fieldp = &(*fieldp)->next;
708 }
709 } while (tmp);
710 (*fieldp)->name = strdup(str);
711 if ((*fieldp)->name == NULL)
712 return -ENOMEM;
713 if (*str != '[')
714 goodname = (*fieldp)->name;
715 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
716
717 /* If no name is specified, set the last field name (not array index)*/
718 if (!arg->name) {
719 arg->name = strdup(goodname);
720 if (arg->name == NULL)
721 return -ENOMEM;
722 }
723 return 0;
724 }
725
726 /* Parse perf-probe event command */
727 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
728 {
729 char **argv;
730 int argc, i, ret = 0;
731
732 argv = argv_split(cmd, &argc);
733 if (!argv) {
734 pr_debug("Failed to split arguments.\n");
735 return -ENOMEM;
736 }
737 if (argc - 1 > MAX_PROBE_ARGS) {
738 semantic_error("Too many probe arguments (%d).\n", argc - 1);
739 ret = -ERANGE;
740 goto out;
741 }
742 /* Parse probe point */
743 ret = parse_perf_probe_point(argv[0], pev);
744 if (ret < 0)
745 goto out;
746
747 /* Copy arguments and ensure return probe has no C argument */
748 pev->nargs = argc - 1;
749 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
750 if (pev->args == NULL) {
751 ret = -ENOMEM;
752 goto out;
753 }
754 for (i = 0; i < pev->nargs && ret >= 0; i++) {
755 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
756 if (ret >= 0 &&
757 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
758 semantic_error("You can't specify local variable for"
759 " kretprobe.\n");
760 ret = -EINVAL;
761 }
762 }
763 out:
764 argv_free(argv);
765
766 return ret;
767 }
768
769 /* Return true if this perf_probe_event requires debuginfo */
770 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
771 {
772 int i;
773
774 if (pev->point.file || pev->point.line || pev->point.lazy_line)
775 return true;
776
777 for (i = 0; i < pev->nargs; i++)
778 if (is_c_varname(pev->args[i].var))
779 return true;
780
781 return false;
782 }
783
784 /* Parse kprobe_events event into struct probe_point */
785 int parse_kprobe_trace_command(const char *cmd, struct kprobe_trace_event *tev)
786 {
787 struct kprobe_trace_point *tp = &tev->point;
788 char pr;
789 char *p;
790 int ret, i, argc;
791 char **argv;
792
793 pr_debug("Parsing kprobe_events: %s\n", cmd);
794 argv = argv_split(cmd, &argc);
795 if (!argv) {
796 pr_debug("Failed to split arguments.\n");
797 return -ENOMEM;
798 }
799 if (argc < 2) {
800 semantic_error("Too few probe arguments.\n");
801 ret = -ERANGE;
802 goto out;
803 }
804
805 /* Scan event and group name. */
806 ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
807 &pr, (float *)(void *)&tev->group,
808 (float *)(void *)&tev->event);
809 if (ret != 3) {
810 semantic_error("Failed to parse event name: %s\n", argv[0]);
811 ret = -EINVAL;
812 goto out;
813 }
814 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
815
816 tp->retprobe = (pr == 'r');
817
818 /* Scan function name and offset */
819 ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol,
820 &tp->offset);
821 if (ret == 1)
822 tp->offset = 0;
823
824 tev->nargs = argc - 2;
825 tev->args = zalloc(sizeof(struct kprobe_trace_arg) * tev->nargs);
826 if (tev->args == NULL) {
827 ret = -ENOMEM;
828 goto out;
829 }
830 for (i = 0; i < tev->nargs; i++) {
831 p = strchr(argv[i + 2], '=');
832 if (p) /* We don't need which register is assigned. */
833 *p++ = '\0';
834 else
835 p = argv[i + 2];
836 tev->args[i].name = strdup(argv[i + 2]);
837 /* TODO: parse regs and offset */
838 tev->args[i].value = strdup(p);
839 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
840 ret = -ENOMEM;
841 goto out;
842 }
843 }
844 ret = 0;
845 out:
846 argv_free(argv);
847 return ret;
848 }
849
850 /* Compose only probe arg */
851 int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
852 {
853 struct perf_probe_arg_field *field = pa->field;
854 int ret;
855 char *tmp = buf;
856
857 if (pa->name && pa->var)
858 ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
859 else
860 ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
861 if (ret <= 0)
862 goto error;
863 tmp += ret;
864 len -= ret;
865
866 while (field) {
867 if (field->name[0] == '[')
868 ret = e_snprintf(tmp, len, "%s", field->name);
869 else
870 ret = e_snprintf(tmp, len, "%s%s",
871 field->ref ? "->" : ".", field->name);
872 if (ret <= 0)
873 goto error;
874 tmp += ret;
875 len -= ret;
876 field = field->next;
877 }
878
879 if (pa->type) {
880 ret = e_snprintf(tmp, len, ":%s", pa->type);
881 if (ret <= 0)
882 goto error;
883 tmp += ret;
884 len -= ret;
885 }
886
887 return tmp - buf;
888 error:
889 pr_debug("Failed to synthesize perf probe argument: %s",
890 strerror(-ret));
891 return ret;
892 }
893
894 /* Compose only probe point (not argument) */
895 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
896 {
897 char *buf, *tmp;
898 char offs[32] = "", line[32] = "", file[32] = "";
899 int ret, len;
900
901 buf = zalloc(MAX_CMDLEN);
902 if (buf == NULL) {
903 ret = -ENOMEM;
904 goto error;
905 }
906 if (pp->offset) {
907 ret = e_snprintf(offs, 32, "+%lu", pp->offset);
908 if (ret <= 0)
909 goto error;
910 }
911 if (pp->line) {
912 ret = e_snprintf(line, 32, ":%d", pp->line);
913 if (ret <= 0)
914 goto error;
915 }
916 if (pp->file) {
917 len = strlen(pp->file) - 31;
918 if (len < 0)
919 len = 0;
920 tmp = strchr(pp->file + len, '/');
921 if (!tmp)
922 tmp = pp->file + len;
923 ret = e_snprintf(file, 32, "@%s", tmp + 1);
924 if (ret <= 0)
925 goto error;
926 }
927
928 if (pp->function)
929 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
930 offs, pp->retprobe ? "%return" : "", line,
931 file);
932 else
933 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
934 if (ret <= 0)
935 goto error;
936
937 return buf;
938 error:
939 pr_debug("Failed to synthesize perf probe point: %s",
940 strerror(-ret));
941 if (buf)
942 free(buf);
943 return NULL;
944 }
945
946 #if 0
947 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
948 {
949 char *buf;
950 int i, len, ret;
951
952 buf = synthesize_perf_probe_point(&pev->point);
953 if (!buf)
954 return NULL;
955
956 len = strlen(buf);
957 for (i = 0; i < pev->nargs; i++) {
958 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
959 pev->args[i].name);
960 if (ret <= 0) {
961 free(buf);
962 return NULL;
963 }
964 len += ret;
965 }
966
967 return buf;
968 }
969 #endif
970
971 static int __synthesize_kprobe_trace_arg_ref(struct kprobe_trace_arg_ref *ref,
972 char **buf, size_t *buflen,
973 int depth)
974 {
975 int ret;
976 if (ref->next) {
977 depth = __synthesize_kprobe_trace_arg_ref(ref->next, buf,
978 buflen, depth + 1);
979 if (depth < 0)
980 goto out;
981 }
982
983 ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
984 if (ret < 0)
985 depth = ret;
986 else {
987 *buf += ret;
988 *buflen -= ret;
989 }
990 out:
991 return depth;
992
993 }
994
995 static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg,
996 char *buf, size_t buflen)
997 {
998 struct kprobe_trace_arg_ref *ref = arg->ref;
999 int ret, depth = 0;
1000 char *tmp = buf;
1001
1002 /* Argument name or separator */
1003 if (arg->name)
1004 ret = e_snprintf(buf, buflen, " %s=", arg->name);
1005 else
1006 ret = e_snprintf(buf, buflen, " ");
1007 if (ret < 0)
1008 return ret;
1009 buf += ret;
1010 buflen -= ret;
1011
1012 /* Special case: @XXX */
1013 if (arg->value[0] == '@' && arg->ref)
1014 ref = ref->next;
1015
1016 /* Dereferencing arguments */
1017 if (ref) {
1018 depth = __synthesize_kprobe_trace_arg_ref(ref, &buf,
1019 &buflen, 1);
1020 if (depth < 0)
1021 return depth;
1022 }
1023
1024 /* Print argument value */
1025 if (arg->value[0] == '@' && arg->ref)
1026 ret = e_snprintf(buf, buflen, "%s%+ld", arg->value,
1027 arg->ref->offset);
1028 else
1029 ret = e_snprintf(buf, buflen, "%s", arg->value);
1030 if (ret < 0)
1031 return ret;
1032 buf += ret;
1033 buflen -= ret;
1034
1035 /* Closing */
1036 while (depth--) {
1037 ret = e_snprintf(buf, buflen, ")");
1038 if (ret < 0)
1039 return ret;
1040 buf += ret;
1041 buflen -= ret;
1042 }
1043 /* Print argument type */
1044 if (arg->type) {
1045 ret = e_snprintf(buf, buflen, ":%s", arg->type);
1046 if (ret <= 0)
1047 return ret;
1048 buf += ret;
1049 }
1050
1051 return buf - tmp;
1052 }
1053
1054 char *synthesize_kprobe_trace_command(struct kprobe_trace_event *tev)
1055 {
1056 struct kprobe_trace_point *tp = &tev->point;
1057 char *buf;
1058 int i, len, ret;
1059
1060 buf = zalloc(MAX_CMDLEN);
1061 if (buf == NULL)
1062 return NULL;
1063
1064 len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu",
1065 tp->retprobe ? 'r' : 'p',
1066 tev->group, tev->event,
1067 tp->symbol, tp->offset);
1068 if (len <= 0)
1069 goto error;
1070
1071 for (i = 0; i < tev->nargs; i++) {
1072 ret = synthesize_kprobe_trace_arg(&tev->args[i], buf + len,
1073 MAX_CMDLEN - len);
1074 if (ret <= 0)
1075 goto error;
1076 len += ret;
1077 }
1078
1079 return buf;
1080 error:
1081 free(buf);
1082 return NULL;
1083 }
1084
1085 int convert_to_perf_probe_event(struct kprobe_trace_event *tev,
1086 struct perf_probe_event *pev)
1087 {
1088 char buf[64] = "";
1089 int i, ret;
1090
1091 /* Convert event/group name */
1092 pev->event = strdup(tev->event);
1093 pev->group = strdup(tev->group);
1094 if (pev->event == NULL || pev->group == NULL)
1095 return -ENOMEM;
1096
1097 /* Convert trace_point to probe_point */
1098 ret = convert_to_perf_probe_point(&tev->point, &pev->point);
1099 if (ret < 0)
1100 return ret;
1101
1102 /* Convert trace_arg to probe_arg */
1103 pev->nargs = tev->nargs;
1104 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1105 if (pev->args == NULL)
1106 return -ENOMEM;
1107 for (i = 0; i < tev->nargs && ret >= 0; i++) {
1108 if (tev->args[i].name)
1109 pev->args[i].name = strdup(tev->args[i].name);
1110 else {
1111 ret = synthesize_kprobe_trace_arg(&tev->args[i],
1112 buf, 64);
1113 pev->args[i].name = strdup(buf);
1114 }
1115 if (pev->args[i].name == NULL && ret >= 0)
1116 ret = -ENOMEM;
1117 }
1118
1119 if (ret < 0)
1120 clear_perf_probe_event(pev);
1121
1122 return ret;
1123 }
1124
1125 void clear_perf_probe_event(struct perf_probe_event *pev)
1126 {
1127 struct perf_probe_point *pp = &pev->point;
1128 struct perf_probe_arg_field *field, *next;
1129 int i;
1130
1131 if (pev->event)
1132 free(pev->event);
1133 if (pev->group)
1134 free(pev->group);
1135 if (pp->file)
1136 free(pp->file);
1137 if (pp->function)
1138 free(pp->function);
1139 if (pp->lazy_line)
1140 free(pp->lazy_line);
1141 for (i = 0; i < pev->nargs; i++) {
1142 if (pev->args[i].name)
1143 free(pev->args[i].name);
1144 if (pev->args[i].var)
1145 free(pev->args[i].var);
1146 if (pev->args[i].type)
1147 free(pev->args[i].type);
1148 field = pev->args[i].field;
1149 while (field) {
1150 next = field->next;
1151 if (field->name)
1152 free(field->name);
1153 free(field);
1154 field = next;
1155 }
1156 }
1157 if (pev->args)
1158 free(pev->args);
1159 memset(pev, 0, sizeof(*pev));
1160 }
1161
1162 void clear_kprobe_trace_event(struct kprobe_trace_event *tev)
1163 {
1164 struct kprobe_trace_arg_ref *ref, *next;
1165 int i;
1166
1167 if (tev->event)
1168 free(tev->event);
1169 if (tev->group)
1170 free(tev->group);
1171 if (tev->point.symbol)
1172 free(tev->point.symbol);
1173 for (i = 0; i < tev->nargs; i++) {
1174 if (tev->args[i].name)
1175 free(tev->args[i].name);
1176 if (tev->args[i].value)
1177 free(tev->args[i].value);
1178 if (tev->args[i].type)
1179 free(tev->args[i].type);
1180 ref = tev->args[i].ref;
1181 while (ref) {
1182 next = ref->next;
1183 free(ref);
1184 ref = next;
1185 }
1186 }
1187 if (tev->args)
1188 free(tev->args);
1189 memset(tev, 0, sizeof(*tev));
1190 }
1191
1192 static int open_kprobe_events(bool readwrite)
1193 {
1194 char buf[PATH_MAX];
1195 const char *__debugfs;
1196 int ret;
1197
1198 __debugfs = debugfs_find_mountpoint();
1199 if (__debugfs == NULL) {
1200 pr_warning("Debugfs is not mounted.\n");
1201 return -ENOENT;
1202 }
1203
1204 ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs);
1205 if (ret >= 0) {
1206 pr_debug("Opening %s write=%d\n", buf, readwrite);
1207 if (readwrite && !probe_event_dry_run)
1208 ret = open(buf, O_RDWR, O_APPEND);
1209 else
1210 ret = open(buf, O_RDONLY, 0);
1211 }
1212
1213 if (ret < 0) {
1214 if (errno == ENOENT)
1215 pr_warning("kprobe_events file does not exist - please"
1216 " rebuild kernel with CONFIG_KPROBE_EVENT.\n");
1217 else
1218 pr_warning("Failed to open kprobe_events file: %s\n",
1219 strerror(errno));
1220 }
1221 return ret;
1222 }
1223
1224 /* Get raw string list of current kprobe_events */
1225 static struct strlist *get_kprobe_trace_command_rawlist(int fd)
1226 {
1227 int ret, idx;
1228 FILE *fp;
1229 char buf[MAX_CMDLEN];
1230 char *p;
1231 struct strlist *sl;
1232
1233 sl = strlist__new(true, NULL);
1234
1235 fp = fdopen(dup(fd), "r");
1236 while (!feof(fp)) {
1237 p = fgets(buf, MAX_CMDLEN, fp);
1238 if (!p)
1239 break;
1240
1241 idx = strlen(p) - 1;
1242 if (p[idx] == '\n')
1243 p[idx] = '\0';
1244 ret = strlist__add(sl, buf);
1245 if (ret < 0) {
1246 pr_debug("strlist__add failed: %s\n", strerror(-ret));
1247 strlist__delete(sl);
1248 return NULL;
1249 }
1250 }
1251 fclose(fp);
1252
1253 return sl;
1254 }
1255
1256 /* Show an event */
1257 static int show_perf_probe_event(struct perf_probe_event *pev)
1258 {
1259 int i, ret;
1260 char buf[128];
1261 char *place;
1262
1263 /* Synthesize only event probe point */
1264 place = synthesize_perf_probe_point(&pev->point);
1265 if (!place)
1266 return -EINVAL;
1267
1268 ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
1269 if (ret < 0)
1270 return ret;
1271
1272 printf(" %-20s (on %s", buf, place);
1273
1274 if (pev->nargs > 0) {
1275 printf(" with");
1276 for (i = 0; i < pev->nargs; i++) {
1277 ret = synthesize_perf_probe_arg(&pev->args[i],
1278 buf, 128);
1279 if (ret < 0)
1280 break;
1281 printf(" %s", buf);
1282 }
1283 }
1284 printf(")\n");
1285 free(place);
1286 return ret;
1287 }
1288
1289 /* List up current perf-probe events */
1290 int show_perf_probe_events(void)
1291 {
1292 int fd, ret;
1293 struct kprobe_trace_event tev;
1294 struct perf_probe_event pev;
1295 struct strlist *rawlist;
1296 struct str_node *ent;
1297
1298 setup_pager();
1299 ret = init_vmlinux();
1300 if (ret < 0)
1301 return ret;
1302
1303 memset(&tev, 0, sizeof(tev));
1304 memset(&pev, 0, sizeof(pev));
1305
1306 fd = open_kprobe_events(false);
1307 if (fd < 0)
1308 return fd;
1309
1310 rawlist = get_kprobe_trace_command_rawlist(fd);
1311 close(fd);
1312 if (!rawlist)
1313 return -ENOENT;
1314
1315 strlist__for_each(ent, rawlist) {
1316 ret = parse_kprobe_trace_command(ent->s, &tev);
1317 if (ret >= 0) {
1318 ret = convert_to_perf_probe_event(&tev, &pev);
1319 if (ret >= 0)
1320 ret = show_perf_probe_event(&pev);
1321 }
1322 clear_perf_probe_event(&pev);
1323 clear_kprobe_trace_event(&tev);
1324 if (ret < 0)
1325 break;
1326 }
1327 strlist__delete(rawlist);
1328
1329 return ret;
1330 }
1331
1332 /* Get current perf-probe event names */
1333 static struct strlist *get_kprobe_trace_event_names(int fd, bool include_group)
1334 {
1335 char buf[128];
1336 struct strlist *sl, *rawlist;
1337 struct str_node *ent;
1338 struct kprobe_trace_event tev;
1339 int ret = 0;
1340
1341 memset(&tev, 0, sizeof(tev));
1342
1343 rawlist = get_kprobe_trace_command_rawlist(fd);
1344 sl = strlist__new(true, NULL);
1345 strlist__for_each(ent, rawlist) {
1346 ret = parse_kprobe_trace_command(ent->s, &tev);
1347 if (ret < 0)
1348 break;
1349 if (include_group) {
1350 ret = e_snprintf(buf, 128, "%s:%s", tev.group,
1351 tev.event);
1352 if (ret >= 0)
1353 ret = strlist__add(sl, buf);
1354 } else
1355 ret = strlist__add(sl, tev.event);
1356 clear_kprobe_trace_event(&tev);
1357 if (ret < 0)
1358 break;
1359 }
1360 strlist__delete(rawlist);
1361
1362 if (ret < 0) {
1363 strlist__delete(sl);
1364 return NULL;
1365 }
1366 return sl;
1367 }
1368
1369 static int write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev)
1370 {
1371 int ret = 0;
1372 char *buf = synthesize_kprobe_trace_command(tev);
1373
1374 if (!buf) {
1375 pr_debug("Failed to synthesize kprobe trace event.\n");
1376 return -EINVAL;
1377 }
1378
1379 pr_debug("Writing event: %s\n", buf);
1380 if (!probe_event_dry_run) {
1381 ret = write(fd, buf, strlen(buf));
1382 if (ret <= 0)
1383 pr_warning("Failed to write event: %s\n",
1384 strerror(errno));
1385 }
1386 free(buf);
1387 return ret;
1388 }
1389
1390 static int get_new_event_name(char *buf, size_t len, const char *base,
1391 struct strlist *namelist, bool allow_suffix)
1392 {
1393 int i, ret;
1394
1395 /* Try no suffix */
1396 ret = e_snprintf(buf, len, "%s", base);
1397 if (ret < 0) {
1398 pr_debug("snprintf() failed: %s\n", strerror(-ret));
1399 return ret;
1400 }
1401 if (!strlist__has_entry(namelist, buf))
1402 return 0;
1403
1404 if (!allow_suffix) {
1405 pr_warning("Error: event \"%s\" already exists. "
1406 "(Use -f to force duplicates.)\n", base);
1407 return -EEXIST;
1408 }
1409
1410 /* Try to add suffix */
1411 for (i = 1; i < MAX_EVENT_INDEX; i++) {
1412 ret = e_snprintf(buf, len, "%s_%d", base, i);
1413 if (ret < 0) {
1414 pr_debug("snprintf() failed: %s\n", strerror(-ret));
1415 return ret;
1416 }
1417 if (!strlist__has_entry(namelist, buf))
1418 break;
1419 }
1420 if (i == MAX_EVENT_INDEX) {
1421 pr_warning("Too many events are on the same function.\n");
1422 ret = -ERANGE;
1423 }
1424
1425 return ret;
1426 }
1427
1428 static int __add_kprobe_trace_events(struct perf_probe_event *pev,
1429 struct kprobe_trace_event *tevs,
1430 int ntevs, bool allow_suffix)
1431 {
1432 int i, fd, ret;
1433 struct kprobe_trace_event *tev = NULL;
1434 char buf[64];
1435 const char *event, *group;
1436 struct strlist *namelist;
1437
1438 fd = open_kprobe_events(true);
1439 if (fd < 0)
1440 return fd;
1441 /* Get current event names */
1442 namelist = get_kprobe_trace_event_names(fd, false);
1443 if (!namelist) {
1444 pr_debug("Failed to get current event list.\n");
1445 return -EIO;
1446 }
1447
1448 ret = 0;
1449 printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":");
1450 for (i = 0; i < ntevs; i++) {
1451 tev = &tevs[i];
1452 if (pev->event)
1453 event = pev->event;
1454 else
1455 if (pev->point.function)
1456 event = pev->point.function;
1457 else
1458 event = tev->point.symbol;
1459 if (pev->group)
1460 group = pev->group;
1461 else
1462 group = PERFPROBE_GROUP;
1463
1464 /* Get an unused new event name */
1465 ret = get_new_event_name(buf, 64, event,
1466 namelist, allow_suffix);
1467 if (ret < 0)
1468 break;
1469 event = buf;
1470
1471 tev->event = strdup(event);
1472 tev->group = strdup(group);
1473 if (tev->event == NULL || tev->group == NULL) {
1474 ret = -ENOMEM;
1475 break;
1476 }
1477 ret = write_kprobe_trace_event(fd, tev);
1478 if (ret < 0)
1479 break;
1480 /* Add added event name to namelist */
1481 strlist__add(namelist, event);
1482
1483 /* Trick here - save current event/group */
1484 event = pev->event;
1485 group = pev->group;
1486 pev->event = tev->event;
1487 pev->group = tev->group;
1488 show_perf_probe_event(pev);
1489 /* Trick here - restore current event/group */
1490 pev->event = (char *)event;
1491 pev->group = (char *)group;
1492
1493 /*
1494 * Probes after the first probe which comes from same
1495 * user input are always allowed to add suffix, because
1496 * there might be several addresses corresponding to
1497 * one code line.
1498 */
1499 allow_suffix = true;
1500 }
1501
1502 if (ret >= 0) {
1503 /* Show how to use the event. */
1504 printf("\nYou can now use it on all perf tools, such as:\n\n");
1505 printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group,
1506 tev->event);
1507 }
1508
1509 strlist__delete(namelist);
1510 close(fd);
1511 return ret;
1512 }
1513
1514 static int convert_to_kprobe_trace_events(struct perf_probe_event *pev,
1515 struct kprobe_trace_event **tevs,
1516 int max_tevs)
1517 {
1518 struct symbol *sym;
1519 int ret = 0, i;
1520 struct kprobe_trace_event *tev;
1521
1522 /* Convert perf_probe_event with debuginfo */
1523 ret = try_to_find_kprobe_trace_events(pev, tevs, max_tevs);
1524 if (ret != 0)
1525 return ret;
1526
1527 /* Allocate trace event buffer */
1528 tev = *tevs = zalloc(sizeof(struct kprobe_trace_event));
1529 if (tev == NULL)
1530 return -ENOMEM;
1531
1532 /* Copy parameters */
1533 tev->point.symbol = strdup(pev->point.function);
1534 if (tev->point.symbol == NULL) {
1535 ret = -ENOMEM;
1536 goto error;
1537 }
1538 tev->point.offset = pev->point.offset;
1539 tev->nargs = pev->nargs;
1540 if (tev->nargs) {
1541 tev->args = zalloc(sizeof(struct kprobe_trace_arg)
1542 * tev->nargs);
1543 if (tev->args == NULL) {
1544 ret = -ENOMEM;
1545 goto error;
1546 }
1547 for (i = 0; i < tev->nargs; i++) {
1548 if (pev->args[i].name) {
1549 tev->args[i].name = strdup(pev->args[i].name);
1550 if (tev->args[i].name == NULL) {
1551 ret = -ENOMEM;
1552 goto error;
1553 }
1554 }
1555 tev->args[i].value = strdup(pev->args[i].var);
1556 if (tev->args[i].value == NULL) {
1557 ret = -ENOMEM;
1558 goto error;
1559 }
1560 if (pev->args[i].type) {
1561 tev->args[i].type = strdup(pev->args[i].type);
1562 if (tev->args[i].type == NULL) {
1563 ret = -ENOMEM;
1564 goto error;
1565 }
1566 }
1567 }
1568 }
1569
1570 /* Currently just checking function name from symbol map */
1571 sym = map__find_symbol_by_name(machine.vmlinux_maps[MAP__FUNCTION],
1572 tev->point.symbol, NULL);
1573 if (!sym) {
1574 pr_warning("Kernel symbol \'%s\' not found.\n",
1575 tev->point.symbol);
1576 ret = -ENOENT;
1577 goto error;
1578 }
1579
1580 return 1;
1581 error:
1582 clear_kprobe_trace_event(tev);
1583 free(tev);
1584 *tevs = NULL;
1585 return ret;
1586 }
1587
1588 struct __event_package {
1589 struct perf_probe_event *pev;
1590 struct kprobe_trace_event *tevs;
1591 int ntevs;
1592 };
1593
1594 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
1595 bool force_add, int max_tevs)
1596 {
1597 int i, j, ret;
1598 struct __event_package *pkgs;
1599
1600 pkgs = zalloc(sizeof(struct __event_package) * npevs);
1601 if (pkgs == NULL)
1602 return -ENOMEM;
1603
1604 /* Init vmlinux path */
1605 ret = init_vmlinux();
1606 if (ret < 0)
1607 return ret;
1608
1609 /* Loop 1: convert all events */
1610 for (i = 0; i < npevs; i++) {
1611 pkgs[i].pev = &pevs[i];
1612 /* Convert with or without debuginfo */
1613 ret = convert_to_kprobe_trace_events(pkgs[i].pev,
1614 &pkgs[i].tevs, max_tevs);
1615 if (ret < 0)
1616 goto end;
1617 pkgs[i].ntevs = ret;
1618 }
1619
1620 /* Loop 2: add all events */
1621 for (i = 0; i < npevs && ret >= 0; i++)
1622 ret = __add_kprobe_trace_events(pkgs[i].pev, pkgs[i].tevs,
1623 pkgs[i].ntevs, force_add);
1624 end:
1625 /* Loop 3: cleanup trace events */
1626 for (i = 0; i < npevs; i++)
1627 for (j = 0; j < pkgs[i].ntevs; j++)
1628 clear_kprobe_trace_event(&pkgs[i].tevs[j]);
1629
1630 return ret;
1631 }
1632
1633 static int __del_trace_kprobe_event(int fd, struct str_node *ent)
1634 {
1635 char *p;
1636 char buf[128];
1637 int ret;
1638
1639 /* Convert from perf-probe event to trace-kprobe event */
1640 ret = e_snprintf(buf, 128, "-:%s", ent->s);
1641 if (ret < 0)
1642 goto error;
1643
1644 p = strchr(buf + 2, ':');
1645 if (!p) {
1646 pr_debug("Internal error: %s should have ':' but not.\n",
1647 ent->s);
1648 ret = -ENOTSUP;
1649 goto error;
1650 }
1651 *p = '/';
1652
1653 pr_debug("Writing event: %s\n", buf);
1654 ret = write(fd, buf, strlen(buf));
1655 if (ret < 0)
1656 goto error;
1657
1658 printf("Remove event: %s\n", ent->s);
1659 return 0;
1660 error:
1661 pr_warning("Failed to delete event: %s\n", strerror(-ret));
1662 return ret;
1663 }
1664
1665 static int del_trace_kprobe_event(int fd, const char *group,
1666 const char *event, struct strlist *namelist)
1667 {
1668 char buf[128];
1669 struct str_node *ent, *n;
1670 int found = 0, ret = 0;
1671
1672 ret = e_snprintf(buf, 128, "%s:%s", group, event);
1673 if (ret < 0) {
1674 pr_err("Failed to copy event.");
1675 return ret;
1676 }
1677
1678 if (strpbrk(buf, "*?")) { /* Glob-exp */
1679 strlist__for_each_safe(ent, n, namelist)
1680 if (strglobmatch(ent->s, buf)) {
1681 found++;
1682 ret = __del_trace_kprobe_event(fd, ent);
1683 if (ret < 0)
1684 break;
1685 strlist__remove(namelist, ent);
1686 }
1687 } else {
1688 ent = strlist__find(namelist, buf);
1689 if (ent) {
1690 found++;
1691 ret = __del_trace_kprobe_event(fd, ent);
1692 if (ret >= 0)
1693 strlist__remove(namelist, ent);
1694 }
1695 }
1696 if (found == 0 && ret >= 0)
1697 pr_info("Info: Event \"%s\" does not exist.\n", buf);
1698
1699 return ret;
1700 }
1701
1702 int del_perf_probe_events(struct strlist *dellist)
1703 {
1704 int fd, ret = 0;
1705 const char *group, *event;
1706 char *p, *str;
1707 struct str_node *ent;
1708 struct strlist *namelist;
1709
1710 fd = open_kprobe_events(true);
1711 if (fd < 0)
1712 return fd;
1713
1714 /* Get current event names */
1715 namelist = get_kprobe_trace_event_names(fd, true);
1716 if (namelist == NULL)
1717 return -EINVAL;
1718
1719 strlist__for_each(ent, dellist) {
1720 str = strdup(ent->s);
1721 if (str == NULL) {
1722 ret = -ENOMEM;
1723 break;
1724 }
1725 pr_debug("Parsing: %s\n", str);
1726 p = strchr(str, ':');
1727 if (p) {
1728 group = str;
1729 *p = '\0';
1730 event = p + 1;
1731 } else {
1732 group = "*";
1733 event = str;
1734 }
1735 pr_debug("Group: %s, Event: %s\n", group, event);
1736 ret = del_trace_kprobe_event(fd, group, event, namelist);
1737 free(str);
1738 if (ret < 0)
1739 break;
1740 }
1741 strlist__delete(namelist);
1742 close(fd);
1743
1744 return ret;
1745 }
1746
kernel source for telekom puls (alcatel/mediatek)