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RPS: Ensure that an expired hardware filter can be re-added later
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / tools / perf / util / probe-event.c
blob1c7bfa5fe0a81052fa1718cf996ef80c21d2e96e
1 /*
2 * probe-event.c : perf-probe definition to probe_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 #include <elf.h>
35
36 #undef _GNU_SOURCE
37 #include "util.h"
38 #include "event.h"
39 #include "string.h"
40 #include "strlist.h"
41 #include "debug.h"
42 #include "cache.h"
43 #include "color.h"
44 #include "symbol.h"
45 #include "thread.h"
46 #include "debugfs.h"
47 #include "trace-event.h" /* For __unused */
48 #include "probe-event.h"
49 #include "probe-finder.h"
50
51 #define MAX_CMDLEN 256
52 #define MAX_PROBE_ARGS 128
53 #define PERFPROBE_GROUP "probe"
54
55 bool probe_event_dry_run; /* Dry run flag */
56
57 #define semantic_error(msg ...) pr_err("Semantic error :" msg)
58
59 /* If there is no space to write, returns -E2BIG. */
60 static int e_snprintf(char *str, size_t size, const char *format, ...)
61 __attribute__((format(printf, 3, 4)));
62
63 static int e_snprintf(char *str, size_t size, const char *format, ...)
64 {
65 int ret;
66 va_list ap;
67 va_start(ap, format);
68 ret = vsnprintf(str, size, format, ap);
69 va_end(ap);
70 if (ret >= (int)size)
71 ret = -E2BIG;
72 return ret;
73 }
74
75 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
76 static struct machine machine;
77
78 /* Initialize symbol maps and path of vmlinux/modules */
79 static int init_vmlinux(void)
80 {
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, "", HOST_KERNEL_ID);
95 if (ret < 0)
96 goto out;
97
98 if (machine__create_kernel_maps(&machine) < 0) {
99 pr_debug("machine__create_kernel_maps() failed.\n");
100 goto out;
101 }
102 out:
103 if (ret < 0)
104 pr_warning("Failed to init vmlinux path.\n");
105 return ret;
106 }
107
108 static struct symbol *__find_kernel_function_by_name(const char *name,
109 struct map **mapp)
110 {
111 return machine__find_kernel_function_by_name(&machine, name, mapp,
112 NULL);
113 }
114
115 static struct map *kernel_get_module_map(const char *module)
116 {
117 struct rb_node *nd;
118 struct map_groups *grp = &machine.kmaps;
119
120 /* A file path -- this is an offline module */
121 if (module && strchr(module, '/'))
122 return machine__new_module(&machine, 0, module);
123
124 if (!module)
125 module = "kernel";
126
127 for (nd = rb_first(&grp->maps[MAP__FUNCTION]); nd; nd = rb_next(nd)) {
128 struct map *pos = rb_entry(nd, struct map, rb_node);
129 if (strncmp(pos->dso->short_name + 1, module,
130 pos->dso->short_name_len - 2) == 0) {
131 return pos;
132 }
133 }
134 return NULL;
135 }
136
137 static struct dso *kernel_get_module_dso(const char *module)
138 {
139 struct dso *dso;
140 struct map *map;
141 const char *vmlinux_name;
142
143 if (module) {
144 list_for_each_entry(dso, &machine.kernel_dsos, node) {
145 if (strncmp(dso->short_name + 1, module,
146 dso->short_name_len - 2) == 0)
147 goto found;
148 }
149 pr_debug("Failed to find module %s.\n", module);
150 return NULL;
151 }
152
153 map = machine.vmlinux_maps[MAP__FUNCTION];
154 dso = map->dso;
155
156 vmlinux_name = symbol_conf.vmlinux_name;
157 if (vmlinux_name) {
158 if (dso__load_vmlinux(dso, map, vmlinux_name, NULL) <= 0)
159 return NULL;
160 } else {
161 if (dso__load_vmlinux_path(dso, map, NULL) <= 0) {
162 pr_debug("Failed to load kernel map.\n");
163 return NULL;
164 }
165 }
166 found:
167 return dso;
168 }
169
170 const char *kernel_get_module_path(const char *module)
171 {
172 struct dso *dso = kernel_get_module_dso(module);
173 return (dso) ? dso->long_name : NULL;
174 }
175
176 #ifdef DWARF_SUPPORT
177 /* Open new debuginfo of given module */
178 static struct debuginfo *open_debuginfo(const char *module)
179 {
180 const char *path;
181
182 /* A file path -- this is an offline module */
183 if (module && strchr(module, '/'))
184 path = module;
185 else {
186 path = kernel_get_module_path(module);
187
188 if (!path) {
189 pr_err("Failed to find path of %s module.\n",
190 module ?: "kernel");
191 return NULL;
192 }
193 }
194 return debuginfo__new(path);
195 }
196
197 /*
198 * Convert trace point to probe point with debuginfo
199 * Currently only handles kprobes.
200 */
201 static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
202 struct perf_probe_point *pp)
203 {
204 struct symbol *sym;
205 struct map *map;
206 u64 addr;
207 int ret = -ENOENT;
208 struct debuginfo *dinfo;
209
210 sym = __find_kernel_function_by_name(tp->symbol, &map);
211 if (sym) {
212 addr = map->unmap_ip(map, sym->start + tp->offset);
213 pr_debug("try to find %s+%ld@%" PRIx64 "\n", tp->symbol,
214 tp->offset, addr);
215
216 dinfo = debuginfo__new_online_kernel(addr);
217 if (dinfo) {
218 ret = debuginfo__find_probe_point(dinfo,
219 (unsigned long)addr, pp);
220 debuginfo__delete(dinfo);
221 } else {
222 pr_debug("Failed to open debuginfo at 0x%" PRIx64 "\n",
223 addr);
224 ret = -ENOENT;
225 }
226 }
227 if (ret <= 0) {
228 pr_debug("Failed to find corresponding probes from "
229 "debuginfo. Use kprobe event information.\n");
230 pp->function = strdup(tp->symbol);
231 if (pp->function == NULL)
232 return -ENOMEM;
233 pp->offset = tp->offset;
234 }
235 pp->retprobe = tp->retprobe;
236
237 return 0;
238 }
239
240 static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
241 int ntevs, const char *module)
242 {
243 int i, ret = 0;
244 char *tmp;
245
246 if (!module)
247 return 0;
248
249 tmp = strrchr(module, '/');
250 if (tmp) {
251 /* This is a module path -- get the module name */
252 module = strdup(tmp + 1);
253 if (!module)
254 return -ENOMEM;
255 tmp = strchr(module, '.');
256 if (tmp)
257 *tmp = '\0';
258 tmp = (char *)module; /* For free() */
259 }
260
261 for (i = 0; i < ntevs; i++) {
262 tevs[i].point.module = strdup(module);
263 if (!tevs[i].point.module) {
264 ret = -ENOMEM;
265 break;
266 }
267 }
268
269 if (tmp)
270 free(tmp);
271
272 return ret;
273 }
274
275 /* Try to find perf_probe_event with debuginfo */
276 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
277 struct probe_trace_event **tevs,
278 int max_tevs, const char *module)
279 {
280 bool need_dwarf = perf_probe_event_need_dwarf(pev);
281 struct debuginfo *dinfo = open_debuginfo(module);
282 int ntevs, ret = 0;
283
284 if (!dinfo) {
285 if (need_dwarf) {
286 pr_warning("Failed to open debuginfo file.\n");
287 return -ENOENT;
288 }
289 pr_debug("Could not open debuginfo. Try to use symbols.\n");
290 return 0;
291 }
292
293 /* Searching trace events corresponding to a probe event */
294 ntevs = debuginfo__find_trace_events(dinfo, pev, tevs, max_tevs);
295
296 debuginfo__delete(dinfo);
297
298 if (ntevs > 0) { /* Succeeded to find trace events */
299 pr_debug("find %d probe_trace_events.\n", ntevs);
300 if (module)
301 ret = add_module_to_probe_trace_events(*tevs, ntevs,
302 module);
303 return ret < 0 ? ret : ntevs;
304 }
305
306 if (ntevs == 0) { /* No error but failed to find probe point. */
307 pr_warning("Probe point '%s' not found.\n",
308 synthesize_perf_probe_point(&pev->point));
309 return -ENOENT;
310 }
311 /* Error path : ntevs < 0 */
312 pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
313 if (ntevs == -EBADF) {
314 pr_warning("Warning: No dwarf info found in the vmlinux - "
315 "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
316 if (!need_dwarf) {
317 pr_debug("Trying to use symbols.\n");
318 return 0;
319 }
320 }
321 return ntevs;
322 }
323
324 /*
325 * Find a src file from a DWARF tag path. Prepend optional source path prefix
326 * and chop off leading directories that do not exist. Result is passed back as
327 * a newly allocated path on success.
328 * Return 0 if file was found and readable, -errno otherwise.
329 */
330 static int get_real_path(const char *raw_path, const char *comp_dir,
331 char **new_path)
332 {
333 const char *prefix = symbol_conf.source_prefix;
334
335 if (!prefix) {
336 if (raw_path[0] != '/' && comp_dir)
337 /* If not an absolute path, try to use comp_dir */
338 prefix = comp_dir;
339 else {
340 if (access(raw_path, R_OK) == 0) {
341 *new_path = strdup(raw_path);
342 return 0;
343 } else
344 return -errno;
345 }
346 }
347
348 *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2));
349 if (!*new_path)
350 return -ENOMEM;
351
352 for (;;) {
353 sprintf(*new_path, "%s/%s", prefix, raw_path);
354
355 if (access(*new_path, R_OK) == 0)
356 return 0;
357
358 if (!symbol_conf.source_prefix)
359 /* In case of searching comp_dir, don't retry */
360 return -errno;
361
362 switch (errno) {
363 case ENAMETOOLONG:
364 case ENOENT:
365 case EROFS:
366 case EFAULT:
367 raw_path = strchr(++raw_path, '/');
368 if (!raw_path) {
369 free(*new_path);
370 *new_path = NULL;
371 return -ENOENT;
372 }
373 continue;
374
375 default:
376 free(*new_path);
377 *new_path = NULL;
378 return -errno;
379 }
380 }
381 }
382
383 #define LINEBUF_SIZE 256
384 #define NR_ADDITIONAL_LINES 2
385
386 static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
387 {
388 char buf[LINEBUF_SIZE];
389 const char *color = show_num ? "" : PERF_COLOR_BLUE;
390 const char *prefix = NULL;
391
392 do {
393 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
394 goto error;
395 if (skip)
396 continue;
397 if (!prefix) {
398 prefix = show_num ? "%7d " : " ";
399 color_fprintf(stdout, color, prefix, l);
400 }
401 color_fprintf(stdout, color, "%s", buf);
402
403 } while (strchr(buf, '\n') == NULL);
404
405 return 1;
406 error:
407 if (ferror(fp)) {
408 pr_warning("File read error: %s\n", strerror(errno));
409 return -1;
410 }
411 return 0;
412 }
413
414 static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
415 {
416 int rv = __show_one_line(fp, l, skip, show_num);
417 if (rv == 0) {
418 pr_warning("Source file is shorter than expected.\n");
419 rv = -1;
420 }
421 return rv;
422 }
423
424 #define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
425 #define show_one_line(f,l) _show_one_line(f,l,false,false)
426 #define skip_one_line(f,l) _show_one_line(f,l,true,false)
427 #define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
428
429 /*
430 * Show line-range always requires debuginfo to find source file and
431 * line number.
432 */
433 int show_line_range(struct line_range *lr, const char *module)
434 {
435 int l = 1;
436 struct line_node *ln;
437 struct debuginfo *dinfo;
438 FILE *fp;
439 int ret;
440 char *tmp;
441
442 /* Search a line range */
443 ret = init_vmlinux();
444 if (ret < 0)
445 return ret;
446
447 dinfo = open_debuginfo(module);
448 if (!dinfo) {
449 pr_warning("Failed to open debuginfo file.\n");
450 return -ENOENT;
451 }
452
453 ret = debuginfo__find_line_range(dinfo, lr);
454 debuginfo__delete(dinfo);
455 if (ret == 0) {
456 pr_warning("Specified source line is not found.\n");
457 return -ENOENT;
458 } else if (ret < 0) {
459 pr_warning("Debuginfo analysis failed. (%d)\n", ret);
460 return ret;
461 }
462
463 /* Convert source file path */
464 tmp = lr->path;
465 ret = get_real_path(tmp, lr->comp_dir, &lr->path);
466 free(tmp); /* Free old path */
467 if (ret < 0) {
468 pr_warning("Failed to find source file. (%d)\n", ret);
469 return ret;
470 }
471
472 setup_pager();
473
474 if (lr->function)
475 fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
476 lr->start - lr->offset);
477 else
478 fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
479
480 fp = fopen(lr->path, "r");
481 if (fp == NULL) {
482 pr_warning("Failed to open %s: %s\n", lr->path,
483 strerror(errno));
484 return -errno;
485 }
486 /* Skip to starting line number */
487 while (l < lr->start) {
488 ret = skip_one_line(fp, l++);
489 if (ret < 0)
490 goto end;
491 }
492
493 list_for_each_entry(ln, &lr->line_list, list) {
494 for (; ln->line > l; l++) {
495 ret = show_one_line(fp, l - lr->offset);
496 if (ret < 0)
497 goto end;
498 }
499 ret = show_one_line_with_num(fp, l++ - lr->offset);
500 if (ret < 0)
501 goto end;
502 }
503
504 if (lr->end == INT_MAX)
505 lr->end = l + NR_ADDITIONAL_LINES;
506 while (l <= lr->end) {
507 ret = show_one_line_or_eof(fp, l++ - lr->offset);
508 if (ret <= 0)
509 break;
510 }
511 end:
512 fclose(fp);
513 return ret;
514 }
515
516 static int show_available_vars_at(struct debuginfo *dinfo,
517 struct perf_probe_event *pev,
518 int max_vls, struct strfilter *_filter,
519 bool externs)
520 {
521 char *buf;
522 int ret, i, nvars;
523 struct str_node *node;
524 struct variable_list *vls = NULL, *vl;
525 const char *var;
526
527 buf = synthesize_perf_probe_point(&pev->point);
528 if (!buf)
529 return -EINVAL;
530 pr_debug("Searching variables at %s\n", buf);
531
532 ret = debuginfo__find_available_vars_at(dinfo, pev, &vls,
533 max_vls, externs);
534 if (ret <= 0) {
535 pr_err("Failed to find variables at %s (%d)\n", buf, ret);
536 goto end;
537 }
538 /* Some variables are found */
539 fprintf(stdout, "Available variables at %s\n", buf);
540 for (i = 0; i < ret; i++) {
541 vl = &vls[i];
542 /*
543 * A probe point might be converted to
544 * several trace points.
545 */
546 fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
547 vl->point.offset);
548 free(vl->point.symbol);
549 nvars = 0;
550 if (vl->vars) {
551 strlist__for_each(node, vl->vars) {
552 var = strchr(node->s, '\t') + 1;
553 if (strfilter__compare(_filter, var)) {
554 fprintf(stdout, "\t\t%s\n", node->s);
555 nvars++;
556 }
557 }
558 strlist__delete(vl->vars);
559 }
560 if (nvars == 0)
561 fprintf(stdout, "\t\t(No matched variables)\n");
562 }
563 free(vls);
564 end:
565 free(buf);
566 return ret;
567 }
568
569 /* Show available variables on given probe point */
570 int show_available_vars(struct perf_probe_event *pevs, int npevs,
571 int max_vls, const char *module,
572 struct strfilter *_filter, bool externs)
573 {
574 int i, ret = 0;
575 struct debuginfo *dinfo;
576
577 ret = init_vmlinux();
578 if (ret < 0)
579 return ret;
580
581 dinfo = open_debuginfo(module);
582 if (!dinfo) {
583 pr_warning("Failed to open debuginfo file.\n");
584 return -ENOENT;
585 }
586
587 setup_pager();
588
589 for (i = 0; i < npevs && ret >= 0; i++)
590 ret = show_available_vars_at(dinfo, &pevs[i], max_vls, _filter,
591 externs);
592
593 debuginfo__delete(dinfo);
594 return ret;
595 }
596
597 #else /* !DWARF_SUPPORT */
598
599 static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
600 struct perf_probe_point *pp)
601 {
602 struct symbol *sym;
603
604 sym = __find_kernel_function_by_name(tp->symbol, NULL);
605 if (!sym) {
606 pr_err("Failed to find symbol %s in kernel.\n", tp->symbol);
607 return -ENOENT;
608 }
609 pp->function = strdup(tp->symbol);
610 if (pp->function == NULL)
611 return -ENOMEM;
612 pp->offset = tp->offset;
613 pp->retprobe = tp->retprobe;
614
615 return 0;
616 }
617
618 static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
619 struct probe_trace_event **tevs __unused,
620 int max_tevs __unused, const char *mod __unused)
621 {
622 if (perf_probe_event_need_dwarf(pev)) {
623 pr_warning("Debuginfo-analysis is not supported.\n");
624 return -ENOSYS;
625 }
626 return 0;
627 }
628
629 int show_line_range(struct line_range *lr __unused, const char *module __unused)
630 {
631 pr_warning("Debuginfo-analysis is not supported.\n");
632 return -ENOSYS;
633 }
634
635 int show_available_vars(struct perf_probe_event *pevs __unused,
636 int npevs __unused, int max_vls __unused,
637 const char *module __unused,
638 struct strfilter *filter __unused,
639 bool externs __unused)
640 {
641 pr_warning("Debuginfo-analysis is not supported.\n");
642 return -ENOSYS;
643 }
644 #endif
645
646 static int parse_line_num(char **ptr, int *val, const char *what)
647 {
648 const char *start = *ptr;
649
650 errno = 0;
651 *val = strtol(*ptr, ptr, 0);
652 if (errno || *ptr == start) {
653 semantic_error("'%s' is not a valid number.\n", what);
654 return -EINVAL;
655 }
656 return 0;
657 }
658
659 /*
660 * Stuff 'lr' according to the line range described by 'arg'.
661 * The line range syntax is described by:
662 *
663 * SRC[:SLN[+NUM|-ELN]]
664 * FNC[@SRC][:SLN[+NUM|-ELN]]
665 */
666 int parse_line_range_desc(const char *arg, struct line_range *lr)
667 {
668 char *range, *file, *name = strdup(arg);
669 int err;
670
671 if (!name)
672 return -ENOMEM;
673
674 lr->start = 0;
675 lr->end = INT_MAX;
676
677 range = strchr(name, ':');
678 if (range) {
679 *range++ = '\0';
680
681 err = parse_line_num(&range, &lr->start, "start line");
682 if (err)
683 goto err;
684
685 if (*range == '+' || *range == '-') {
686 const char c = *range++;
687
688 err = parse_line_num(&range, &lr->end, "end line");
689 if (err)
690 goto err;
691
692 if (c == '+') {
693 lr->end += lr->start;
694 /*
695 * Adjust the number of lines here.
696 * If the number of lines == 1, the
697 * the end of line should be equal to
698 * the start of line.
699 */
700 lr->end--;
701 }
702 }
703
704 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
705
706 err = -EINVAL;
707 if (lr->start > lr->end) {
708 semantic_error("Start line must be smaller"
709 " than end line.\n");
710 goto err;
711 }
712 if (*range != '\0') {
713 semantic_error("Tailing with invalid str '%s'.\n", range);
714 goto err;
715 }
716 }
717
718 file = strchr(name, '@');
719 if (file) {
720 *file = '\0';
721 lr->file = strdup(++file);
722 if (lr->file == NULL) {
723 err = -ENOMEM;
724 goto err;
725 }
726 lr->function = name;
727 } else if (strchr(name, '.'))
728 lr->file = name;
729 else
730 lr->function = name;
731
732 return 0;
733 err:
734 free(name);
735 return err;
736 }
737
738 /* Check the name is good for event/group */
739 static bool check_event_name(const char *name)
740 {
741 if (!isalpha(*name) && *name != '_')
742 return false;
743 while (*++name != '\0') {
744 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
745 return false;
746 }
747 return true;
748 }
749
750 /* Parse probepoint definition. */
751 static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
752 {
753 struct perf_probe_point *pp = &pev->point;
754 char *ptr, *tmp;
755 char c, nc = 0;
756 /*
757 * <Syntax>
758 * perf probe [EVENT=]SRC[:LN|;PTN]
759 * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
760 *
761 * TODO:Group name support
762 */
763
764 ptr = strpbrk(arg, ";=@+%");
765 if (ptr && *ptr == '=') { /* Event name */
766 *ptr = '\0';
767 tmp = ptr + 1;
768 if (strchr(arg, ':')) {
769 semantic_error("Group name is not supported yet.\n");
770 return -ENOTSUP;
771 }
772 if (!check_event_name(arg)) {
773 semantic_error("%s is bad for event name -it must "
774 "follow C symbol-naming rule.\n", arg);
775 return -EINVAL;
776 }
777 pev->event = strdup(arg);
778 if (pev->event == NULL)
779 return -ENOMEM;
780 pev->group = NULL;
781 arg = tmp;
782 }
783
784 ptr = strpbrk(arg, ";:+@%");
785 if (ptr) {
786 nc = *ptr;
787 *ptr++ = '\0';
788 }
789
790 tmp = strdup(arg);
791 if (tmp == NULL)
792 return -ENOMEM;
793
794 /* Check arg is function or file and copy it */
795 if (strchr(tmp, '.')) /* File */
796 pp->file = tmp;
797 else /* Function */
798 pp->function = tmp;
799
800 /* Parse other options */
801 while (ptr) {
802 arg = ptr;
803 c = nc;
804 if (c == ';') { /* Lazy pattern must be the last part */
805 pp->lazy_line = strdup(arg);
806 if (pp->lazy_line == NULL)
807 return -ENOMEM;
808 break;
809 }
810 ptr = strpbrk(arg, ";:+@%");
811 if (ptr) {
812 nc = *ptr;
813 *ptr++ = '\0';
814 }
815 switch (c) {
816 case ':': /* Line number */
817 pp->line = strtoul(arg, &tmp, 0);
818 if (*tmp != '\0') {
819 semantic_error("There is non-digit char"
820 " in line number.\n");
821 return -EINVAL;
822 }
823 break;
824 case '+': /* Byte offset from a symbol */
825 pp->offset = strtoul(arg, &tmp, 0);
826 if (*tmp != '\0') {
827 semantic_error("There is non-digit character"
828 " in offset.\n");
829 return -EINVAL;
830 }
831 break;
832 case '@': /* File name */
833 if (pp->file) {
834 semantic_error("SRC@SRC is not allowed.\n");
835 return -EINVAL;
836 }
837 pp->file = strdup(arg);
838 if (pp->file == NULL)
839 return -ENOMEM;
840 break;
841 case '%': /* Probe places */
842 if (strcmp(arg, "return") == 0) {
843 pp->retprobe = 1;
844 } else { /* Others not supported yet */
845 semantic_error("%%%s is not supported.\n", arg);
846 return -ENOTSUP;
847 }
848 break;
849 default: /* Buggy case */
850 pr_err("This program has a bug at %s:%d.\n",
851 __FILE__, __LINE__);
852 return -ENOTSUP;
853 break;
854 }
855 }
856
857 /* Exclusion check */
858 if (pp->lazy_line && pp->line) {
859 semantic_error("Lazy pattern can't be used with"
860 " line number.\n");
861 return -EINVAL;
862 }
863
864 if (pp->lazy_line && pp->offset) {
865 semantic_error("Lazy pattern can't be used with offset.\n");
866 return -EINVAL;
867 }
868
869 if (pp->line && pp->offset) {
870 semantic_error("Offset can't be used with line number.\n");
871 return -EINVAL;
872 }
873
874 if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
875 semantic_error("File always requires line number or "
876 "lazy pattern.\n");
877 return -EINVAL;
878 }
879
880 if (pp->offset && !pp->function) {
881 semantic_error("Offset requires an entry function.\n");
882 return -EINVAL;
883 }
884
885 if (pp->retprobe && !pp->function) {
886 semantic_error("Return probe requires an entry function.\n");
887 return -EINVAL;
888 }
889
890 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
891 semantic_error("Offset/Line/Lazy pattern can't be used with "
892 "return probe.\n");
893 return -EINVAL;
894 }
895
896 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
897 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
898 pp->lazy_line);
899 return 0;
900 }
901
902 /* Parse perf-probe event argument */
903 static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
904 {
905 char *tmp, *goodname;
906 struct perf_probe_arg_field **fieldp;
907
908 pr_debug("parsing arg: %s into ", str);
909
910 tmp = strchr(str, '=');
911 if (tmp) {
912 arg->name = strndup(str, tmp - str);
913 if (arg->name == NULL)
914 return -ENOMEM;
915 pr_debug("name:%s ", arg->name);
916 str = tmp + 1;
917 }
918
919 tmp = strchr(str, ':');
920 if (tmp) { /* Type setting */
921 *tmp = '\0';
922 arg->type = strdup(tmp + 1);
923 if (arg->type == NULL)
924 return -ENOMEM;
925 pr_debug("type:%s ", arg->type);
926 }
927
928 tmp = strpbrk(str, "-.[");
929 if (!is_c_varname(str) || !tmp) {
930 /* A variable, register, symbol or special value */
931 arg->var = strdup(str);
932 if (arg->var == NULL)
933 return -ENOMEM;
934 pr_debug("%s\n", arg->var);
935 return 0;
936 }
937
938 /* Structure fields or array element */
939 arg->var = strndup(str, tmp - str);
940 if (arg->var == NULL)
941 return -ENOMEM;
942 goodname = arg->var;
943 pr_debug("%s, ", arg->var);
944 fieldp = &arg->field;
945
946 do {
947 *fieldp = zalloc(sizeof(struct perf_probe_arg_field));
948 if (*fieldp == NULL)
949 return -ENOMEM;
950 if (*tmp == '[') { /* Array */
951 str = tmp;
952 (*fieldp)->index = strtol(str + 1, &tmp, 0);
953 (*fieldp)->ref = true;
954 if (*tmp != ']' || tmp == str + 1) {
955 semantic_error("Array index must be a"
956 " number.\n");
957 return -EINVAL;
958 }
959 tmp++;
960 if (*tmp == '\0')
961 tmp = NULL;
962 } else { /* Structure */
963 if (*tmp == '.') {
964 str = tmp + 1;
965 (*fieldp)->ref = false;
966 } else if (tmp[1] == '>') {
967 str = tmp + 2;
968 (*fieldp)->ref = true;
969 } else {
970 semantic_error("Argument parse error: %s\n",
971 str);
972 return -EINVAL;
973 }
974 tmp = strpbrk(str, "-.[");
975 }
976 if (tmp) {
977 (*fieldp)->name = strndup(str, tmp - str);
978 if ((*fieldp)->name == NULL)
979 return -ENOMEM;
980 if (*str != '[')
981 goodname = (*fieldp)->name;
982 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
983 fieldp = &(*fieldp)->next;
984 }
985 } while (tmp);
986 (*fieldp)->name = strdup(str);
987 if ((*fieldp)->name == NULL)
988 return -ENOMEM;
989 if (*str != '[')
990 goodname = (*fieldp)->name;
991 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
992
993 /* If no name is specified, set the last field name (not array index)*/
994 if (!arg->name) {
995 arg->name = strdup(goodname);
996 if (arg->name == NULL)
997 return -ENOMEM;
998 }
999 return 0;
1000 }
1001
1002 /* Parse perf-probe event command */
1003 int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
1004 {
1005 char **argv;
1006 int argc, i, ret = 0;
1007
1008 argv = argv_split(cmd, &argc);
1009 if (!argv) {
1010 pr_debug("Failed to split arguments.\n");
1011 return -ENOMEM;
1012 }
1013 if (argc - 1 > MAX_PROBE_ARGS) {
1014 semantic_error("Too many probe arguments (%d).\n", argc - 1);
1015 ret = -ERANGE;
1016 goto out;
1017 }
1018 /* Parse probe point */
1019 ret = parse_perf_probe_point(argv[0], pev);
1020 if (ret < 0)
1021 goto out;
1022
1023 /* Copy arguments and ensure return probe has no C argument */
1024 pev->nargs = argc - 1;
1025 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1026 if (pev->args == NULL) {
1027 ret = -ENOMEM;
1028 goto out;
1029 }
1030 for (i = 0; i < pev->nargs && ret >= 0; i++) {
1031 ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
1032 if (ret >= 0 &&
1033 is_c_varname(pev->args[i].var) && pev->point.retprobe) {
1034 semantic_error("You can't specify local variable for"
1035 " kretprobe.\n");
1036 ret = -EINVAL;
1037 }
1038 }
1039 out:
1040 argv_free(argv);
1041
1042 return ret;
1043 }
1044
1045 /* Return true if this perf_probe_event requires debuginfo */
1046 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
1047 {
1048 int i;
1049
1050 if (pev->point.file || pev->point.line || pev->point.lazy_line)
1051 return true;
1052
1053 for (i = 0; i < pev->nargs; i++)
1054 if (is_c_varname(pev->args[i].var))
1055 return true;
1056
1057 return false;
1058 }
1059
1060 /* Parse probe_events event into struct probe_point */
1061 static int parse_probe_trace_command(const char *cmd,
1062 struct probe_trace_event *tev)
1063 {
1064 struct probe_trace_point *tp = &tev->point;
1065 char pr;
1066 char *p;
1067 int ret, i, argc;
1068 char **argv;
1069
1070 pr_debug("Parsing probe_events: %s\n", cmd);
1071 argv = argv_split(cmd, &argc);
1072 if (!argv) {
1073 pr_debug("Failed to split arguments.\n");
1074 return -ENOMEM;
1075 }
1076 if (argc < 2) {
1077 semantic_error("Too few probe arguments.\n");
1078 ret = -ERANGE;
1079 goto out;
1080 }
1081
1082 /* Scan event and group name. */
1083 ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
1084 &pr, (float *)(void *)&tev->group,
1085 (float *)(void *)&tev->event);
1086 if (ret != 3) {
1087 semantic_error("Failed to parse event name: %s\n", argv[0]);
1088 ret = -EINVAL;
1089 goto out;
1090 }
1091 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
1092
1093 tp->retprobe = (pr == 'r');
1094
1095 /* Scan module name(if there), function name and offset */
1096 p = strchr(argv[1], ':');
1097 if (p) {
1098 tp->module = strndup(argv[1], p - argv[1]);
1099 p++;
1100 } else
1101 p = argv[1];
1102 ret = sscanf(p, "%a[^+]+%lu", (float *)(void *)&tp->symbol,
1103 &tp->offset);
1104 if (ret == 1)
1105 tp->offset = 0;
1106
1107 tev->nargs = argc - 2;
1108 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1109 if (tev->args == NULL) {
1110 ret = -ENOMEM;
1111 goto out;
1112 }
1113 for (i = 0; i < tev->nargs; i++) {
1114 p = strchr(argv[i + 2], '=');
1115 if (p) /* We don't need which register is assigned. */
1116 *p++ = '\0';
1117 else
1118 p = argv[i + 2];
1119 tev->args[i].name = strdup(argv[i + 2]);
1120 /* TODO: parse regs and offset */
1121 tev->args[i].value = strdup(p);
1122 if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
1123 ret = -ENOMEM;
1124 goto out;
1125 }
1126 }
1127 ret = 0;
1128 out:
1129 argv_free(argv);
1130 return ret;
1131 }
1132
1133 /* Compose only probe arg */
1134 int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
1135 {
1136 struct perf_probe_arg_field *field = pa->field;
1137 int ret;
1138 char *tmp = buf;
1139
1140 if (pa->name && pa->var)
1141 ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
1142 else
1143 ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
1144 if (ret <= 0)
1145 goto error;
1146 tmp += ret;
1147 len -= ret;
1148
1149 while (field) {
1150 if (field->name[0] == '[')
1151 ret = e_snprintf(tmp, len, "%s", field->name);
1152 else
1153 ret = e_snprintf(tmp, len, "%s%s",
1154 field->ref ? "->" : ".", field->name);
1155 if (ret <= 0)
1156 goto error;
1157 tmp += ret;
1158 len -= ret;
1159 field = field->next;
1160 }
1161
1162 if (pa->type) {
1163 ret = e_snprintf(tmp, len, ":%s", pa->type);
1164 if (ret <= 0)
1165 goto error;
1166 tmp += ret;
1167 len -= ret;
1168 }
1169
1170 return tmp - buf;
1171 error:
1172 pr_debug("Failed to synthesize perf probe argument: %s\n",
1173 strerror(-ret));
1174 return ret;
1175 }
1176
1177 /* Compose only probe point (not argument) */
1178 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
1179 {
1180 char *buf, *tmp;
1181 char offs[32] = "", line[32] = "", file[32] = "";
1182 int ret, len;
1183
1184 buf = zalloc(MAX_CMDLEN);
1185 if (buf == NULL) {
1186 ret = -ENOMEM;
1187 goto error;
1188 }
1189 if (pp->offset) {
1190 ret = e_snprintf(offs, 32, "+%lu", pp->offset);
1191 if (ret <= 0)
1192 goto error;
1193 }
1194 if (pp->line) {
1195 ret = e_snprintf(line, 32, ":%d", pp->line);
1196 if (ret <= 0)
1197 goto error;
1198 }
1199 if (pp->file) {
1200 tmp = pp->file;
1201 len = strlen(tmp);
1202 if (len > 30) {
1203 tmp = strchr(pp->file + len - 30, '/');
1204 tmp = tmp ? tmp + 1 : pp->file + len - 30;
1205 }
1206 ret = e_snprintf(file, 32, "@%s", tmp);
1207 if (ret <= 0)
1208 goto error;
1209 }
1210
1211 if (pp->function)
1212 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
1213 offs, pp->retprobe ? "%return" : "", line,
1214 file);
1215 else
1216 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
1217 if (ret <= 0)
1218 goto error;
1219
1220 return buf;
1221 error:
1222 pr_debug("Failed to synthesize perf probe point: %s\n",
1223 strerror(-ret));
1224 if (buf)
1225 free(buf);
1226 return NULL;
1227 }
1228
1229 #if 0
1230 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
1231 {
1232 char *buf;
1233 int i, len, ret;
1234
1235 buf = synthesize_perf_probe_point(&pev->point);
1236 if (!buf)
1237 return NULL;
1238
1239 len = strlen(buf);
1240 for (i = 0; i < pev->nargs; i++) {
1241 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
1242 pev->args[i].name);
1243 if (ret <= 0) {
1244 free(buf);
1245 return NULL;
1246 }
1247 len += ret;
1248 }
1249
1250 return buf;
1251 }
1252 #endif
1253
1254 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
1255 char **buf, size_t *buflen,
1256 int depth)
1257 {
1258 int ret;
1259 if (ref->next) {
1260 depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
1261 buflen, depth + 1);
1262 if (depth < 0)
1263 goto out;
1264 }
1265
1266 ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
1267 if (ret < 0)
1268 depth = ret;
1269 else {
1270 *buf += ret;
1271 *buflen -= ret;
1272 }
1273 out:
1274 return depth;
1275
1276 }
1277
1278 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
1279 char *buf, size_t buflen)
1280 {
1281 struct probe_trace_arg_ref *ref = arg->ref;
1282 int ret, depth = 0;
1283 char *tmp = buf;
1284
1285 /* Argument name or separator */
1286 if (arg->name)
1287 ret = e_snprintf(buf, buflen, " %s=", arg->name);
1288 else
1289 ret = e_snprintf(buf, buflen, " ");
1290 if (ret < 0)
1291 return ret;
1292 buf += ret;
1293 buflen -= ret;
1294
1295 /* Special case: @XXX */
1296 if (arg->value[0] == '@' && arg->ref)
1297 ref = ref->next;
1298
1299 /* Dereferencing arguments */
1300 if (ref) {
1301 depth = __synthesize_probe_trace_arg_ref(ref, &buf,
1302 &buflen, 1);
1303 if (depth < 0)
1304 return depth;
1305 }
1306
1307 /* Print argument value */
1308 if (arg->value[0] == '@' && arg->ref)
1309 ret = e_snprintf(buf, buflen, "%s%+ld", arg->value,
1310 arg->ref->offset);
1311 else
1312 ret = e_snprintf(buf, buflen, "%s", arg->value);
1313 if (ret < 0)
1314 return ret;
1315 buf += ret;
1316 buflen -= ret;
1317
1318 /* Closing */
1319 while (depth--) {
1320 ret = e_snprintf(buf, buflen, ")");
1321 if (ret < 0)
1322 return ret;
1323 buf += ret;
1324 buflen -= ret;
1325 }
1326 /* Print argument type */
1327 if (arg->type) {
1328 ret = e_snprintf(buf, buflen, ":%s", arg->type);
1329 if (ret <= 0)
1330 return ret;
1331 buf += ret;
1332 }
1333
1334 return buf - tmp;
1335 }
1336
1337 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
1338 {
1339 struct probe_trace_point *tp = &tev->point;
1340 char *buf;
1341 int i, len, ret;
1342
1343 buf = zalloc(MAX_CMDLEN);
1344 if (buf == NULL)
1345 return NULL;
1346
1347 len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s%s%s+%lu",
1348 tp->retprobe ? 'r' : 'p',
1349 tev->group, tev->event,
1350 tp->module ?: "", tp->module ? ":" : "",
1351 tp->symbol, tp->offset);
1352 if (len <= 0)
1353 goto error;
1354
1355 for (i = 0; i < tev->nargs; i++) {
1356 ret = synthesize_probe_trace_arg(&tev->args[i], buf + len,
1357 MAX_CMDLEN - len);
1358 if (ret <= 0)
1359 goto error;
1360 len += ret;
1361 }
1362
1363 return buf;
1364 error:
1365 free(buf);
1366 return NULL;
1367 }
1368
1369 static int convert_to_perf_probe_event(struct probe_trace_event *tev,
1370 struct perf_probe_event *pev)
1371 {
1372 char buf[64] = "";
1373 int i, ret;
1374
1375 /* Convert event/group name */
1376 pev->event = strdup(tev->event);
1377 pev->group = strdup(tev->group);
1378 if (pev->event == NULL || pev->group == NULL)
1379 return -ENOMEM;
1380
1381 /* Convert trace_point to probe_point */
1382 ret = kprobe_convert_to_perf_probe(&tev->point, &pev->point);
1383 if (ret < 0)
1384 return ret;
1385
1386 /* Convert trace_arg to probe_arg */
1387 pev->nargs = tev->nargs;
1388 pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
1389 if (pev->args == NULL)
1390 return -ENOMEM;
1391 for (i = 0; i < tev->nargs && ret >= 0; i++) {
1392 if (tev->args[i].name)
1393 pev->args[i].name = strdup(tev->args[i].name);
1394 else {
1395 ret = synthesize_probe_trace_arg(&tev->args[i],
1396 buf, 64);
1397 pev->args[i].name = strdup(buf);
1398 }
1399 if (pev->args[i].name == NULL && ret >= 0)
1400 ret = -ENOMEM;
1401 }
1402
1403 if (ret < 0)
1404 clear_perf_probe_event(pev);
1405
1406 return ret;
1407 }
1408
1409 void clear_perf_probe_event(struct perf_probe_event *pev)
1410 {
1411 struct perf_probe_point *pp = &pev->point;
1412 struct perf_probe_arg_field *field, *next;
1413 int i;
1414
1415 if (pev->event)
1416 free(pev->event);
1417 if (pev->group)
1418 free(pev->group);
1419 if (pp->file)
1420 free(pp->file);
1421 if (pp->function)
1422 free(pp->function);
1423 if (pp->lazy_line)
1424 free(pp->lazy_line);
1425 for (i = 0; i < pev->nargs; i++) {
1426 if (pev->args[i].name)
1427 free(pev->args[i].name);
1428 if (pev->args[i].var)
1429 free(pev->args[i].var);
1430 if (pev->args[i].type)
1431 free(pev->args[i].type);
1432 field = pev->args[i].field;
1433 while (field) {
1434 next = field->next;
1435 if (field->name)
1436 free(field->name);
1437 free(field);
1438 field = next;
1439 }
1440 }
1441 if (pev->args)
1442 free(pev->args);
1443 memset(pev, 0, sizeof(*pev));
1444 }
1445
1446 static void clear_probe_trace_event(struct probe_trace_event *tev)
1447 {
1448 struct probe_trace_arg_ref *ref, *next;
1449 int i;
1450
1451 if (tev->event)
1452 free(tev->event);
1453 if (tev->group)
1454 free(tev->group);
1455 if (tev->point.symbol)
1456 free(tev->point.symbol);
1457 if (tev->point.module)
1458 free(tev->point.module);
1459 for (i = 0; i < tev->nargs; i++) {
1460 if (tev->args[i].name)
1461 free(tev->args[i].name);
1462 if (tev->args[i].value)
1463 free(tev->args[i].value);
1464 if (tev->args[i].type)
1465 free(tev->args[i].type);
1466 ref = tev->args[i].ref;
1467 while (ref) {
1468 next = ref->next;
1469 free(ref);
1470 ref = next;
1471 }
1472 }
1473 if (tev->args)
1474 free(tev->args);
1475 memset(tev, 0, sizeof(*tev));
1476 }
1477
1478 static int open_kprobe_events(bool readwrite)
1479 {
1480 char buf[PATH_MAX];
1481 const char *__debugfs;
1482 int ret;
1483
1484 __debugfs = debugfs_find_mountpoint();
1485 if (__debugfs == NULL) {
1486 pr_warning("Debugfs is not mounted.\n");
1487 return -ENOENT;
1488 }
1489
1490 ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs);
1491 if (ret >= 0) {
1492 pr_debug("Opening %s write=%d\n", buf, readwrite);
1493 if (readwrite && !probe_event_dry_run)
1494 ret = open(buf, O_RDWR, O_APPEND);
1495 else
1496 ret = open(buf, O_RDONLY, 0);
1497 }
1498
1499 if (ret < 0) {
1500 if (errno == ENOENT)
1501 pr_warning("kprobe_events file does not exist - please"
1502 " rebuild kernel with CONFIG_KPROBE_EVENT.\n");
1503 else
1504 pr_warning("Failed to open kprobe_events file: %s\n",
1505 strerror(errno));
1506 }
1507 return ret;
1508 }
1509
1510 /* Get raw string list of current kprobe_events */
1511 static struct strlist *get_probe_trace_command_rawlist(int fd)
1512 {
1513 int ret, idx;
1514 FILE *fp;
1515 char buf[MAX_CMDLEN];
1516 char *p;
1517 struct strlist *sl;
1518
1519 sl = strlist__new(true, NULL);
1520
1521 fp = fdopen(dup(fd), "r");
1522 while (!feof(fp)) {
1523 p = fgets(buf, MAX_CMDLEN, fp);
1524 if (!p)
1525 break;
1526
1527 idx = strlen(p) - 1;
1528 if (p[idx] == '\n')
1529 p[idx] = '\0';
1530 ret = strlist__add(sl, buf);
1531 if (ret < 0) {
1532 pr_debug("strlist__add failed: %s\n", strerror(-ret));
1533 strlist__delete(sl);
1534 return NULL;
1535 }
1536 }
1537 fclose(fp);
1538
1539 return sl;
1540 }
1541
1542 /* Show an event */
1543 static int show_perf_probe_event(struct perf_probe_event *pev)
1544 {
1545 int i, ret;
1546 char buf[128];
1547 char *place;
1548
1549 /* Synthesize only event probe point */
1550 place = synthesize_perf_probe_point(&pev->point);
1551 if (!place)
1552 return -EINVAL;
1553
1554 ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
1555 if (ret < 0)
1556 return ret;
1557
1558 printf(" %-20s (on %s", buf, place);
1559
1560 if (pev->nargs > 0) {
1561 printf(" with");
1562 for (i = 0; i < pev->nargs; i++) {
1563 ret = synthesize_perf_probe_arg(&pev->args[i],
1564 buf, 128);
1565 if (ret < 0)
1566 break;
1567 printf(" %s", buf);
1568 }
1569 }
1570 printf(")\n");
1571 free(place);
1572 return ret;
1573 }
1574
1575 /* List up current perf-probe events */
1576 int show_perf_probe_events(void)
1577 {
1578 int fd, ret;
1579 struct probe_trace_event tev;
1580 struct perf_probe_event pev;
1581 struct strlist *rawlist;
1582 struct str_node *ent;
1583
1584 setup_pager();
1585 ret = init_vmlinux();
1586 if (ret < 0)
1587 return ret;
1588
1589 memset(&tev, 0, sizeof(tev));
1590 memset(&pev, 0, sizeof(pev));
1591
1592 fd = open_kprobe_events(false);
1593 if (fd < 0)
1594 return fd;
1595
1596 rawlist = get_probe_trace_command_rawlist(fd);
1597 close(fd);
1598 if (!rawlist)
1599 return -ENOENT;
1600
1601 strlist__for_each(ent, rawlist) {
1602 ret = parse_probe_trace_command(ent->s, &tev);
1603 if (ret >= 0) {
1604 ret = convert_to_perf_probe_event(&tev, &pev);
1605 if (ret >= 0)
1606 ret = show_perf_probe_event(&pev);
1607 }
1608 clear_perf_probe_event(&pev);
1609 clear_probe_trace_event(&tev);
1610 if (ret < 0)
1611 break;
1612 }
1613 strlist__delete(rawlist);
1614
1615 return ret;
1616 }
1617
1618 /* Get current perf-probe event names */
1619 static struct strlist *get_probe_trace_event_names(int fd, bool include_group)
1620 {
1621 char buf[128];
1622 struct strlist *sl, *rawlist;
1623 struct str_node *ent;
1624 struct probe_trace_event tev;
1625 int ret = 0;
1626
1627 memset(&tev, 0, sizeof(tev));
1628 rawlist = get_probe_trace_command_rawlist(fd);
1629 sl = strlist__new(true, NULL);
1630 strlist__for_each(ent, rawlist) {
1631 ret = parse_probe_trace_command(ent->s, &tev);
1632 if (ret < 0)
1633 break;
1634 if (include_group) {
1635 ret = e_snprintf(buf, 128, "%s:%s", tev.group,
1636 tev.event);
1637 if (ret >= 0)
1638 ret = strlist__add(sl, buf);
1639 } else
1640 ret = strlist__add(sl, tev.event);
1641 clear_probe_trace_event(&tev);
1642 if (ret < 0)
1643 break;
1644 }
1645 strlist__delete(rawlist);
1646
1647 if (ret < 0) {
1648 strlist__delete(sl);
1649 return NULL;
1650 }
1651 return sl;
1652 }
1653
1654 static int write_probe_trace_event(int fd, struct probe_trace_event *tev)
1655 {
1656 int ret = 0;
1657 char *buf = synthesize_probe_trace_command(tev);
1658
1659 if (!buf) {
1660 pr_debug("Failed to synthesize probe trace event.\n");
1661 return -EINVAL;
1662 }
1663
1664 pr_debug("Writing event: %s\n", buf);
1665 if (!probe_event_dry_run) {
1666 ret = write(fd, buf, strlen(buf));
1667 if (ret <= 0)
1668 pr_warning("Failed to write event: %s\n",
1669 strerror(errno));
1670 }
1671 free(buf);
1672 return ret;
1673 }
1674
1675 static int get_new_event_name(char *buf, size_t len, const char *base,
1676 struct strlist *namelist, bool allow_suffix)
1677 {
1678 int i, ret;
1679
1680 /* Try no suffix */
1681 ret = e_snprintf(buf, len, "%s", base);
1682 if (ret < 0) {
1683 pr_debug("snprintf() failed: %s\n", strerror(-ret));
1684 return ret;
1685 }
1686 if (!strlist__has_entry(namelist, buf))
1687 return 0;
1688
1689 if (!allow_suffix) {
1690 pr_warning("Error: event \"%s\" already exists. "
1691 "(Use -f to force duplicates.)\n", base);
1692 return -EEXIST;
1693 }
1694
1695 /* Try to add suffix */
1696 for (i = 1; i < MAX_EVENT_INDEX; i++) {
1697 ret = e_snprintf(buf, len, "%s_%d", base, i);
1698 if (ret < 0) {
1699 pr_debug("snprintf() failed: %s\n", strerror(-ret));
1700 return ret;
1701 }
1702 if (!strlist__has_entry(namelist, buf))
1703 break;
1704 }
1705 if (i == MAX_EVENT_INDEX) {
1706 pr_warning("Too many events are on the same function.\n");
1707 ret = -ERANGE;
1708 }
1709
1710 return ret;
1711 }
1712
1713 static int __add_probe_trace_events(struct perf_probe_event *pev,
1714 struct probe_trace_event *tevs,
1715 int ntevs, bool allow_suffix)
1716 {
1717 int i, fd, ret;
1718 struct probe_trace_event *tev = NULL;
1719 char buf[64];
1720 const char *event, *group;
1721 struct strlist *namelist;
1722
1723 fd = open_kprobe_events(true);
1724 if (fd < 0)
1725 return fd;
1726 /* Get current event names */
1727 namelist = get_probe_trace_event_names(fd, false);
1728 if (!namelist) {
1729 pr_debug("Failed to get current event list.\n");
1730 return -EIO;
1731 }
1732
1733 ret = 0;
1734 printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":");
1735 for (i = 0; i < ntevs; i++) {
1736 tev = &tevs[i];
1737 if (pev->event)
1738 event = pev->event;
1739 else
1740 if (pev->point.function)
1741 event = pev->point.function;
1742 else
1743 event = tev->point.symbol;
1744 if (pev->group)
1745 group = pev->group;
1746 else
1747 group = PERFPROBE_GROUP;
1748
1749 /* Get an unused new event name */
1750 ret = get_new_event_name(buf, 64, event,
1751 namelist, allow_suffix);
1752 if (ret < 0)
1753 break;
1754 event = buf;
1755
1756 tev->event = strdup(event);
1757 tev->group = strdup(group);
1758 if (tev->event == NULL || tev->group == NULL) {
1759 ret = -ENOMEM;
1760 break;
1761 }
1762 ret = write_probe_trace_event(fd, tev);
1763 if (ret < 0)
1764 break;
1765 /* Add added event name to namelist */
1766 strlist__add(namelist, event);
1767
1768 /* Trick here - save current event/group */
1769 event = pev->event;
1770 group = pev->group;
1771 pev->event = tev->event;
1772 pev->group = tev->group;
1773 show_perf_probe_event(pev);
1774 /* Trick here - restore current event/group */
1775 pev->event = (char *)event;
1776 pev->group = (char *)group;
1777
1778 /*
1779 * Probes after the first probe which comes from same
1780 * user input are always allowed to add suffix, because
1781 * there might be several addresses corresponding to
1782 * one code line.
1783 */
1784 allow_suffix = true;
1785 }
1786
1787 if (ret >= 0) {
1788 /* Show how to use the event. */
1789 printf("\nYou can now use it on all perf tools, such as:\n\n");
1790 printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group,
1791 tev->event);
1792 }
1793
1794 strlist__delete(namelist);
1795 close(fd);
1796 return ret;
1797 }
1798
1799 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
1800 struct probe_trace_event **tevs,
1801 int max_tevs, const char *module)
1802 {
1803 struct symbol *sym;
1804 int ret = 0, i;
1805 struct probe_trace_event *tev;
1806
1807 /* Convert perf_probe_event with debuginfo */
1808 ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, module);
1809 if (ret != 0)
1810 return ret; /* Found in debuginfo or got an error */
1811
1812 /* Allocate trace event buffer */
1813 tev = *tevs = zalloc(sizeof(struct probe_trace_event));
1814 if (tev == NULL)
1815 return -ENOMEM;
1816
1817 /* Copy parameters */
1818 tev->point.symbol = strdup(pev->point.function);
1819 if (tev->point.symbol == NULL) {
1820 ret = -ENOMEM;
1821 goto error;
1822 }
1823
1824 if (module) {
1825 tev->point.module = strdup(module);
1826 if (tev->point.module == NULL) {
1827 ret = -ENOMEM;
1828 goto error;
1829 }
1830 }
1831
1832 tev->point.offset = pev->point.offset;
1833 tev->point.retprobe = pev->point.retprobe;
1834 tev->nargs = pev->nargs;
1835 if (tev->nargs) {
1836 tev->args = zalloc(sizeof(struct probe_trace_arg)
1837 * tev->nargs);
1838 if (tev->args == NULL) {
1839 ret = -ENOMEM;
1840 goto error;
1841 }
1842 for (i = 0; i < tev->nargs; i++) {
1843 if (pev->args[i].name) {
1844 tev->args[i].name = strdup(pev->args[i].name);
1845 if (tev->args[i].name == NULL) {
1846 ret = -ENOMEM;
1847 goto error;
1848 }
1849 }
1850 tev->args[i].value = strdup(pev->args[i].var);
1851 if (tev->args[i].value == NULL) {
1852 ret = -ENOMEM;
1853 goto error;
1854 }
1855 if (pev->args[i].type) {
1856 tev->args[i].type = strdup(pev->args[i].type);
1857 if (tev->args[i].type == NULL) {
1858 ret = -ENOMEM;
1859 goto error;
1860 }
1861 }
1862 }
1863 }
1864
1865 /* Currently just checking function name from symbol map */
1866 sym = __find_kernel_function_by_name(tev->point.symbol, NULL);
1867 if (!sym) {
1868 pr_warning("Kernel symbol \'%s\' not found.\n",
1869 tev->point.symbol);
1870 ret = -ENOENT;
1871 goto error;
1872 }
1873
1874 return 1;
1875 error:
1876 clear_probe_trace_event(tev);
1877 free(tev);
1878 *tevs = NULL;
1879 return ret;
1880 }
1881
1882 struct __event_package {
1883 struct perf_probe_event *pev;
1884 struct probe_trace_event *tevs;
1885 int ntevs;
1886 };
1887
1888 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
1889 int max_tevs, const char *module, bool force_add)
1890 {
1891 int i, j, ret;
1892 struct __event_package *pkgs;
1893
1894 pkgs = zalloc(sizeof(struct __event_package) * npevs);
1895 if (pkgs == NULL)
1896 return -ENOMEM;
1897
1898 /* Init vmlinux path */
1899 ret = init_vmlinux();
1900 if (ret < 0) {
1901 free(pkgs);
1902 return ret;
1903 }
1904
1905 /* Loop 1: convert all events */
1906 for (i = 0; i < npevs; i++) {
1907 pkgs[i].pev = &pevs[i];
1908 /* Convert with or without debuginfo */
1909 ret = convert_to_probe_trace_events(pkgs[i].pev,
1910 &pkgs[i].tevs,
1911 max_tevs,
1912 module);
1913 if (ret < 0)
1914 goto end;
1915 pkgs[i].ntevs = ret;
1916 }
1917
1918 /* Loop 2: add all events */
1919 for (i = 0; i < npevs; i++) {
1920 ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs,
1921 pkgs[i].ntevs, force_add);
1922 if (ret < 0)
1923 break;
1924 }
1925 end:
1926 /* Loop 3: cleanup and free trace events */
1927 for (i = 0; i < npevs; i++) {
1928 for (j = 0; j < pkgs[i].ntevs; j++)
1929 clear_probe_trace_event(&pkgs[i].tevs[j]);
1930 free(pkgs[i].tevs);
1931 }
1932 free(pkgs);
1933
1934 return ret;
1935 }
1936
1937 static int __del_trace_probe_event(int fd, struct str_node *ent)
1938 {
1939 char *p;
1940 char buf[128];
1941 int ret;
1942
1943 /* Convert from perf-probe event to trace-probe event */
1944 ret = e_snprintf(buf, 128, "-:%s", ent->s);
1945 if (ret < 0)
1946 goto error;
1947
1948 p = strchr(buf + 2, ':');
1949 if (!p) {
1950 pr_debug("Internal error: %s should have ':' but not.\n",
1951 ent->s);
1952 ret = -ENOTSUP;
1953 goto error;
1954 }
1955 *p = '/';
1956
1957 pr_debug("Writing event: %s\n", buf);
1958 ret = write(fd, buf, strlen(buf));
1959 if (ret < 0)
1960 goto error;
1961
1962 printf("Remove event: %s\n", ent->s);
1963 return 0;
1964 error:
1965 pr_warning("Failed to delete event: %s\n", strerror(-ret));
1966 return ret;
1967 }
1968
1969 static int del_trace_probe_event(int fd, const char *group,
1970 const char *event, struct strlist *namelist)
1971 {
1972 char buf[128];
1973 struct str_node *ent, *n;
1974 int found = 0, ret = 0;
1975
1976 ret = e_snprintf(buf, 128, "%s:%s", group, event);
1977 if (ret < 0) {
1978 pr_err("Failed to copy event.\n");
1979 return ret;
1980 }
1981
1982 if (strpbrk(buf, "*?")) { /* Glob-exp */
1983 strlist__for_each_safe(ent, n, namelist)
1984 if (strglobmatch(ent->s, buf)) {
1985 found++;
1986 ret = __del_trace_probe_event(fd, ent);
1987 if (ret < 0)
1988 break;
1989 strlist__remove(namelist, ent);
1990 }
1991 } else {
1992 ent = strlist__find(namelist, buf);
1993 if (ent) {
1994 found++;
1995 ret = __del_trace_probe_event(fd, ent);
1996 if (ret >= 0)
1997 strlist__remove(namelist, ent);
1998 }
1999 }
2000 if (found == 0 && ret >= 0)
2001 pr_info("Info: Event \"%s\" does not exist.\n", buf);
2002
2003 return ret;
2004 }
2005
2006 int del_perf_probe_events(struct strlist *dellist)
2007 {
2008 int fd, ret = 0;
2009 const char *group, *event;
2010 char *p, *str;
2011 struct str_node *ent;
2012 struct strlist *namelist;
2013
2014 fd = open_kprobe_events(true);
2015 if (fd < 0)
2016 return fd;
2017
2018 /* Get current event names */
2019 namelist = get_probe_trace_event_names(fd, true);
2020 if (namelist == NULL)
2021 return -EINVAL;
2022
2023 strlist__for_each(ent, dellist) {
2024 str = strdup(ent->s);
2025 if (str == NULL) {
2026 ret = -ENOMEM;
2027 break;
2028 }
2029 pr_debug("Parsing: %s\n", str);
2030 p = strchr(str, ':');
2031 if (p) {
2032 group = str;
2033 *p = '\0';
2034 event = p + 1;
2035 } else {
2036 group = "*";
2037 event = str;
2038 }
2039 pr_debug("Group: %s, Event: %s\n", group, event);
2040 ret = del_trace_probe_event(fd, group, event, namelist);
2041 free(str);
2042 if (ret < 0)
2043 break;
2044 }
2045 strlist__delete(namelist);
2046 close(fd);
2047
2048 return ret;
2049 }
2050 /* TODO: don't use a global variable for filter ... */
2051 static struct strfilter *available_func_filter;
2052
2053 /*
2054 * If a symbol corresponds to a function with global binding and
2055 * matches filter return 0. For all others return 1.
2056 */
2057 static int filter_available_functions(struct map *map __unused,
2058 struct symbol *sym)
2059 {
2060 if (sym->binding == STB_GLOBAL &&
2061 strfilter__compare(available_func_filter, sym->name))
2062 return 0;
2063 return 1;
2064 }
2065
2066 int show_available_funcs(const char *module, struct strfilter *_filter)
2067 {
2068 struct map *map;
2069 int ret;
2070
2071 setup_pager();
2072
2073 ret = init_vmlinux();
2074 if (ret < 0)
2075 return ret;
2076
2077 map = kernel_get_module_map(module);
2078 if (!map) {
2079 pr_err("Failed to find %s map.\n", (module) ? : "kernel");
2080 return -EINVAL;
2081 }
2082 available_func_filter = _filter;
2083 if (map__load(map, filter_available_functions)) {
2084 pr_err("Failed to load map.\n");
2085 return -EINVAL;
2086 }
2087 if (!dso__sorted_by_name(map->dso, map->type))
2088 dso__sort_by_name(map->dso, map->type);
2089
2090 dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
2091 return 0;
2092 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree