2 * probe-event.c : perf-probe definition to kprobe_events format converter
4 * Written by Masami Hiramatsu <mhiramat@redhat.com>
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.
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.
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.
23 #include <sys/utsname.h>
24 #include <sys/types.h>
45 #include "trace-event.h" /* For __unused */
46 #include "parse-events.h" /* For debugfs_path */
47 #include "probe-event.h"
48 #include "probe-finder.h"
50 #define MAX_CMDLEN 256
51 #define MAX_PROBE_ARGS 128
52 #define PERFPROBE_GROUP "probe"
54 bool probe_event_dry_run; /* Dry run flag */
56 #define semantic_error(msg ...) die("Semantic error :" msg)
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)));
62 static int e_snprintf(char *str, size_t size, const char *format, ...)
67 ret = vsnprintf(str, size, format, ap);
74 static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
75 static struct map_groups kmap_groups;
76 static struct map *kmaps[MAP__NR_TYPES];
78 /* Initialize symbol maps and path of vmlinux */
79 static void init_vmlinux(void)
81 symbol_conf.sort_by_name = true;
82 if (symbol_conf.vmlinux_name == NULL)
83 symbol_conf.try_vmlinux_path = true;
85 pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
86 if (symbol__init() < 0)
87 die("Failed to init symbol map.");
89 map_groups__init(&kmap_groups);
90 if (map_groups__create_kernel_maps(&kmap_groups, kmaps) < 0)
91 die("Failed to create kernel maps.");
95 static int open_vmlinux(void)
97 if (map__load(kmaps[MAP__FUNCTION], NULL) < 0) {
98 pr_debug("Failed to load kernel map.\n");
101 pr_debug("Try to open %s\n", kmaps[MAP__FUNCTION]->dso->long_name);
102 return open(kmaps[MAP__FUNCTION]->dso->long_name, O_RDONLY);
105 static void convert_to_perf_probe_point(struct kprobe_trace_point *tp,
106 struct perf_probe_point *pp)
111 sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
115 ret = find_perf_probe_point(fd, sym->start + tp->offset, pp);
119 pp->function = xstrdup(tp->symbol);
120 pp->offset = tp->offset;
122 pp->retprobe = tp->retprobe;
125 /* Try to find perf_probe_event with debuginfo */
126 static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
127 struct kprobe_trace_event **tevs)
129 bool need_dwarf = perf_probe_event_need_dwarf(pev);
135 die("Could not open debuginfo file.");
137 pr_debug("Could not open vmlinux. Try to use symbols.\n");
141 /* Searching trace events corresponding to probe event */
142 ntevs = find_kprobe_trace_events(fd, pev, tevs);
145 if (ntevs > 0) /* Succeeded to find trace events */
148 if (ntevs == 0) /* No error but failed to find probe point. */
149 die("Probe point '%s' not found. - probe not added.",
150 synthesize_perf_probe_point(&pev->point));
155 pr_warning("No dwarf info found in the vmlinux - "
156 "please rebuild with CONFIG_DEBUG_INFO=y.\n");
157 die("Failed to analyze debuginfo.");
159 pr_debug("An error occurred in debuginfo analysis."
160 " Try to use symbols.\n");
165 #define LINEBUF_SIZE 256
166 #define NR_ADDITIONAL_LINES 2
168 static void show_one_line(FILE *fp, unsigned int l, bool skip, bool show_num)
170 char buf[LINEBUF_SIZE];
171 const char *color = PERF_COLOR_BLUE;
173 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
177 fprintf(stdout, "%7u %s", l, buf);
179 color_fprintf(stdout, color, " %s", buf);
182 while (strlen(buf) == LINEBUF_SIZE - 1 &&
183 buf[LINEBUF_SIZE - 2] != '\n') {
184 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
188 fprintf(stdout, "%s", buf);
190 color_fprintf(stdout, color, "%s", buf);
196 die("Source file is shorter than expected.");
198 die("File read error: %s", strerror(errno));
202 * Show line-range always requires debuginfo to find source file and
205 void show_line_range(struct line_range *lr)
208 struct line_node *ln;
212 /* Search a line range */
216 die("Could not open debuginfo file.");
217 ret = find_line_range(fd, lr);
219 die("Source line is not found.\n");
225 fprintf(stdout, "<%s:%d>\n", lr->function,
226 lr->start - lr->offset);
228 fprintf(stdout, "<%s:%d>\n", lr->file, lr->start);
230 fp = fopen(lr->path, "r");
232 die("Failed to open %s: %s", lr->path, strerror(errno));
233 /* Skip to starting line number */
234 while (l < lr->start)
235 show_one_line(fp, l++, true, false);
237 list_for_each_entry(ln, &lr->line_list, list) {
239 show_one_line(fp, (l++) - lr->offset, false, false);
240 show_one_line(fp, (l++) - lr->offset, false, true);
243 if (lr->end == INT_MAX)
244 lr->end = l + NR_ADDITIONAL_LINES;
245 while (l < lr->end && !feof(fp))
246 show_one_line(fp, (l++) - lr->offset, false, false);
251 #else /* !DWARF_SUPPORT */
253 static void convert_to_perf_probe_point(struct kprobe_trace_point *tp,
254 struct perf_probe_point *pp)
256 pp->function = xstrdup(tp->symbol);
257 pp->offset = tp->offset;
258 pp->retprobe = tp->retprobe;
261 static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
262 struct kprobe_trace_event **tevs __unused)
264 if (perf_probe_event_need_dwarf(pev))
265 die("Debuginfo-analysis is not supported");
269 void show_line_range(struct line_range *lr __unused)
271 die("Debuginfo-analysis is not supported");
276 void parse_line_range_desc(const char *arg, struct line_range *lr)
283 * FUNC[:SLN[+NUM|-ELN]]
285 ptr = strchr(arg, ':');
287 lr->start = (unsigned int)strtoul(ptr + 1, &tmp, 0);
289 lr->end = lr->start + (unsigned int)strtoul(tmp + 1,
291 else if (*tmp == '-')
292 lr->end = (unsigned int)strtoul(tmp + 1, &tmp, 0);
295 pr_debug("Line range is %u to %u\n", lr->start, lr->end);
296 if (lr->end && lr->start > lr->end)
297 semantic_error("Start line must be smaller"
300 semantic_error("Tailing with invalid character '%d'.",
302 tmp = xstrndup(arg, (ptr - arg));
306 if (strchr(tmp, '.'))
312 /* Check the name is good for event/group */
313 static bool check_event_name(const char *name)
315 if (!isalpha(*name) && *name != '_')
317 while (*++name != '\0') {
318 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
324 /* Parse probepoint definition. */
325 static void parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
327 struct perf_probe_point *pp = &pev->point;
332 * perf probe [EVENT=]SRC[:LN|;PTN]
333 * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
335 * TODO:Group name support
338 ptr = strpbrk(arg, ";=@+%");
339 if (ptr && *ptr == '=') { /* Event name */
342 ptr = strchr(arg, ':');
343 if (ptr) /* Group name is not supported yet. */
344 semantic_error("Group name is not supported yet.");
345 if (!check_event_name(arg))
346 semantic_error("%s is bad for event name -it must "
347 "follow C symbol-naming rule.", arg);
348 pev->event = xstrdup(arg);
353 ptr = strpbrk(arg, ";:+@%");
359 /* Check arg is function or file and copy it */
360 if (strchr(arg, '.')) /* File */
361 pp->file = xstrdup(arg);
363 pp->function = xstrdup(arg);
365 /* Parse other options */
369 if (c == ';') { /* Lazy pattern must be the last part */
370 pp->lazy_line = xstrdup(arg);
373 ptr = strpbrk(arg, ";:+@%");
379 case ':': /* Line number */
380 pp->line = strtoul(arg, &tmp, 0);
382 semantic_error("There is non-digit char"
385 case '+': /* Byte offset from a symbol */
386 pp->offset = strtoul(arg, &tmp, 0);
388 semantic_error("There is non-digit character"
391 case '@': /* File name */
393 semantic_error("SRC@SRC is not allowed.");
394 pp->file = xstrdup(arg);
396 case '%': /* Probe places */
397 if (strcmp(arg, "return") == 0) {
399 } else /* Others not supported yet */
400 semantic_error("%%%s is not supported.", arg);
403 DIE_IF("Program has a bug.");
408 /* Exclusion check */
409 if (pp->lazy_line && pp->line)
410 semantic_error("Lazy pattern can't be used with line number.");
412 if (pp->lazy_line && pp->offset)
413 semantic_error("Lazy pattern can't be used with offset.");
415 if (pp->line && pp->offset)
416 semantic_error("Offset can't be used with line number.");
418 if (!pp->line && !pp->lazy_line && pp->file && !pp->function)
419 semantic_error("File always requires line number or "
422 if (pp->offset && !pp->function)
423 semantic_error("Offset requires an entry function.");
425 if (pp->retprobe && !pp->function)
426 semantic_error("Return probe requires an entry function.");
428 if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe)
429 semantic_error("Offset/Line/Lazy pattern can't be used with "
432 pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
433 pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
437 /* Parse perf-probe event argument */
438 static void parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
441 struct perf_probe_arg_field **fieldp;
443 pr_debug("parsing arg: %s into ", str);
445 tmp = strchr(str, '=');
447 arg->name = xstrndup(str, tmp - str);
448 pr_debug("name:%s ", arg->name);
452 tmp = strchr(str, ':');
453 if (tmp) { /* Type setting */
455 arg->type = xstrdup(tmp + 1);
456 pr_debug("type:%s ", arg->type);
459 tmp = strpbrk(str, "-.");
460 if (!is_c_varname(str) || !tmp) {
461 /* A variable, register, symbol or special value */
462 arg->var = xstrdup(str);
463 pr_debug("%s\n", arg->var);
467 /* Structure fields */
468 arg->var = xstrndup(str, tmp - str);
469 pr_debug("%s, ", arg->var);
470 fieldp = &arg->field;
473 *fieldp = xzalloc(sizeof(struct perf_probe_arg_field));
476 (*fieldp)->ref = false;
477 } else if (tmp[1] == '>') {
479 (*fieldp)->ref = true;
481 semantic_error("Argument parse error: %s", str);
483 tmp = strpbrk(str, "-.");
485 (*fieldp)->name = xstrndup(str, tmp - str);
486 pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
487 fieldp = &(*fieldp)->next;
490 (*fieldp)->name = xstrdup(str);
491 pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
493 /* If no name is specified, set the last field name */
495 arg->name = xstrdup((*fieldp)->name);
498 /* Parse perf-probe event command */
499 void parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
504 argv = argv_split(cmd, &argc);
506 die("argv_split failed.");
507 if (argc > MAX_PROBE_ARGS + 1)
508 semantic_error("Too many arguments");
510 /* Parse probe point */
511 parse_perf_probe_point(argv[0], pev);
513 /* Copy arguments and ensure return probe has no C argument */
514 pev->nargs = argc - 1;
515 pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs);
516 for (i = 0; i < pev->nargs; i++) {
517 parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
518 if (is_c_varname(pev->args[i].var) && pev->point.retprobe)
519 semantic_error("You can't specify local variable for"
526 /* Return true if this perf_probe_event requires debuginfo */
527 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
531 if (pev->point.file || pev->point.line || pev->point.lazy_line)
534 for (i = 0; i < pev->nargs; i++)
535 if (is_c_varname(pev->args[i].var))
541 /* Parse kprobe_events event into struct probe_point */
542 void parse_kprobe_trace_command(const char *cmd, struct kprobe_trace_event *tev)
544 struct kprobe_trace_point *tp = &tev->point;
550 pr_debug("Parsing kprobe_events: %s\n", cmd);
551 argv = argv_split(cmd, &argc);
553 die("argv_split failed.");
555 semantic_error("Too less arguments.");
557 /* Scan event and group name. */
558 ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
559 &pr, (float *)(void *)&tev->group,
560 (float *)(void *)&tev->event);
562 semantic_error("Failed to parse event name: %s", argv[0]);
563 pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
565 tp->retprobe = (pr == 'r');
567 /* Scan function name and offset */
568 ret = sscanf(argv[1], "%a[^+]+%lu", (float *)(void *)&tp->symbol,
573 tev->nargs = argc - 2;
574 tev->args = xzalloc(sizeof(struct kprobe_trace_arg) * tev->nargs);
575 for (i = 0; i < tev->nargs; i++) {
576 p = strchr(argv[i + 2], '=');
577 if (p) /* We don't need which register is assigned. */
581 tev->args[i].name = xstrdup(argv[i + 2]);
582 /* TODO: parse regs and offset */
583 tev->args[i].value = xstrdup(p);
589 /* Compose only probe arg */
590 int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
592 struct perf_probe_arg_field *field = pa->field;
596 if (pa->name && pa->var)
597 ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
599 ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
606 ret = e_snprintf(tmp, len, "%s%s", field->ref ? "->" : ".",
616 ret = e_snprintf(tmp, len, ":%s", pa->type);
625 die("Failed to synthesize perf probe argument: %s", strerror(-ret));
628 /* Compose only probe point (not argument) */
629 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
632 char offs[32] = "", line[32] = "", file[32] = "";
635 buf = xzalloc(MAX_CMDLEN);
637 ret = e_snprintf(offs, 32, "+%lu", pp->offset);
642 ret = e_snprintf(line, 32, ":%d", pp->line);
647 len = strlen(pp->file) - 32;
650 tmp = strchr(pp->file + len, '/');
652 tmp = pp->file + len - 1;
653 ret = e_snprintf(file, 32, "@%s", tmp + 1);
659 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
660 offs, pp->retprobe ? "%return" : "", line,
663 ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
669 die("Failed to synthesize perf probe point: %s", strerror(-ret));
673 char *synthesize_perf_probe_command(struct perf_probe_event *pev)
678 buf = synthesize_perf_probe_point(&pev->point);
683 for (i = 0; i < pev->nargs; i++) {
684 ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
697 static int __synthesize_kprobe_trace_arg_ref(struct kprobe_trace_arg_ref *ref,
698 char **buf, size_t *buflen,
703 depth = __synthesize_kprobe_trace_arg_ref(ref->next, buf,
709 ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
721 static int synthesize_kprobe_trace_arg(struct kprobe_trace_arg *arg,
722 char *buf, size_t buflen)
727 /* Argument name or separator */
729 ret = e_snprintf(buf, buflen, " %s=", arg->name);
731 ret = e_snprintf(buf, buflen, " ");
737 /* Dereferencing arguments */
739 depth = __synthesize_kprobe_trace_arg_ref(arg->ref, &buf,
745 /* Print argument value */
746 ret = e_snprintf(buf, buflen, "%s", arg->value);
754 ret = e_snprintf(buf, buflen, ")");
760 /* Print argument type */
762 ret = e_snprintf(buf, buflen, ":%s", arg->type);
771 char *synthesize_kprobe_trace_command(struct kprobe_trace_event *tev)
773 struct kprobe_trace_point *tp = &tev->point;
777 buf = xzalloc(MAX_CMDLEN);
778 len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s+%lu",
779 tp->retprobe ? 'r' : 'p',
780 tev->group, tev->event,
781 tp->symbol, tp->offset);
785 for (i = 0; i < tev->nargs; i++) {
786 ret = synthesize_kprobe_trace_arg(&tev->args[i], buf + len,
799 void convert_to_perf_probe_event(struct kprobe_trace_event *tev,
800 struct perf_probe_event *pev)
805 /* Convert event/group name */
806 pev->event = xstrdup(tev->event);
807 pev->group = xstrdup(tev->group);
809 /* Convert trace_point to probe_point */
810 convert_to_perf_probe_point(&tev->point, &pev->point);
812 /* Convert trace_arg to probe_arg */
813 pev->nargs = tev->nargs;
814 pev->args = xzalloc(sizeof(struct perf_probe_arg) * pev->nargs);
815 for (i = 0; i < tev->nargs; i++)
816 if (tev->args[i].name)
817 pev->args[i].name = xstrdup(tev->args[i].name);
819 synthesize_kprobe_trace_arg(&tev->args[i], buf, 64);
820 pev->args[i].name = xstrdup(buf);
824 void clear_perf_probe_event(struct perf_probe_event *pev)
826 struct perf_probe_point *pp = &pev->point;
827 struct perf_probe_arg_field *field, *next;
840 for (i = 0; i < pev->nargs; i++) {
841 if (pev->args[i].name)
842 free(pev->args[i].name);
843 if (pev->args[i].var)
844 free(pev->args[i].var);
845 if (pev->args[i].type)
846 free(pev->args[i].type);
847 field = pev->args[i].field;
858 memset(pev, 0, sizeof(*pev));
861 void clear_kprobe_trace_event(struct kprobe_trace_event *tev)
863 struct kprobe_trace_arg_ref *ref, *next;
870 if (tev->point.symbol)
871 free(tev->point.symbol);
872 for (i = 0; i < tev->nargs; i++) {
873 if (tev->args[i].name)
874 free(tev->args[i].name);
875 if (tev->args[i].value)
876 free(tev->args[i].value);
877 if (tev->args[i].type)
878 free(tev->args[i].type);
879 ref = tev->args[i].ref;
888 memset(tev, 0, sizeof(*tev));
891 static int open_kprobe_events(bool readwrite)
896 ret = e_snprintf(buf, PATH_MAX, "%s/../kprobe_events", debugfs_path);
898 die("Failed to make kprobe_events path.");
900 if (readwrite && !probe_event_dry_run)
901 ret = open(buf, O_RDWR, O_APPEND);
903 ret = open(buf, O_RDONLY, 0);
907 die("kprobe_events file does not exist -"
908 " please rebuild with CONFIG_KPROBE_EVENT.");
910 die("Could not open kprobe_events file: %s",
916 /* Get raw string list of current kprobe_events */
917 static struct strlist *get_kprobe_trace_command_rawlist(int fd)
921 char buf[MAX_CMDLEN];
925 sl = strlist__new(true, NULL);
927 fp = fdopen(dup(fd), "r");
929 p = fgets(buf, MAX_CMDLEN, fp);
936 ret = strlist__add(sl, buf);
938 die("strlist__add failed: %s", strerror(-ret));
946 static void show_perf_probe_event(struct perf_probe_event *pev)
952 /* Synthesize only event probe point */
953 place = synthesize_perf_probe_point(&pev->point);
955 ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
957 die("Failed to copy event: %s", strerror(-ret));
958 printf(" %-20s (on %s", buf, place);
960 if (pev->nargs > 0) {
962 for (i = 0; i < pev->nargs; i++) {
963 synthesize_perf_probe_arg(&pev->args[i], buf, 128);
971 /* List up current perf-probe events */
972 void show_perf_probe_events(void)
975 struct kprobe_trace_event tev;
976 struct perf_probe_event pev;
977 struct strlist *rawlist;
978 struct str_node *ent;
983 memset(&tev, 0, sizeof(tev));
984 memset(&pev, 0, sizeof(pev));
986 fd = open_kprobe_events(false);
987 rawlist = get_kprobe_trace_command_rawlist(fd);
990 strlist__for_each(ent, rawlist) {
991 parse_kprobe_trace_command(ent->s, &tev);
992 convert_to_perf_probe_event(&tev, &pev);
994 show_perf_probe_event(&pev);
995 clear_perf_probe_event(&pev);
996 clear_kprobe_trace_event(&tev);
999 strlist__delete(rawlist);
1002 /* Get current perf-probe event names */
1003 static struct strlist *get_kprobe_trace_event_names(int fd, bool include_group)
1006 struct strlist *sl, *rawlist;
1007 struct str_node *ent;
1008 struct kprobe_trace_event tev;
1010 memset(&tev, 0, sizeof(tev));
1012 rawlist = get_kprobe_trace_command_rawlist(fd);
1013 sl = strlist__new(true, NULL);
1014 strlist__for_each(ent, rawlist) {
1015 parse_kprobe_trace_command(ent->s, &tev);
1016 if (include_group) {
1017 if (e_snprintf(buf, 128, "%s:%s", tev.group,
1019 die("Failed to copy group:event name.");
1020 strlist__add(sl, buf);
1022 strlist__add(sl, tev.event);
1023 clear_kprobe_trace_event(&tev);
1026 strlist__delete(rawlist);
1031 static void write_kprobe_trace_event(int fd, struct kprobe_trace_event *tev)
1034 char *buf = synthesize_kprobe_trace_command(tev);
1036 pr_debug("Writing event: %s\n", buf);
1037 if (!probe_event_dry_run) {
1038 ret = write(fd, buf, strlen(buf));
1040 die("Failed to write event: %s", strerror(errno));
1045 static void get_new_event_name(char *buf, size_t len, const char *base,
1046 struct strlist *namelist, bool allow_suffix)
1051 ret = e_snprintf(buf, len, "%s", base);
1053 die("snprintf() failed: %s", strerror(-ret));
1054 if (!strlist__has_entry(namelist, buf))
1057 if (!allow_suffix) {
1058 pr_warning("Error: event \"%s\" already exists. "
1059 "(Use -f to force duplicates.)\n", base);
1060 die("Can't add new event.");
1063 /* Try to add suffix */
1064 for (i = 1; i < MAX_EVENT_INDEX; i++) {
1065 ret = e_snprintf(buf, len, "%s_%d", base, i);
1067 die("snprintf() failed: %s", strerror(-ret));
1068 if (!strlist__has_entry(namelist, buf))
1071 if (i == MAX_EVENT_INDEX)
1072 die("Too many events are on the same function.");
1075 static void __add_kprobe_trace_events(struct perf_probe_event *pev,
1076 struct kprobe_trace_event *tevs,
1077 int ntevs, bool allow_suffix)
1080 struct kprobe_trace_event *tev = NULL;
1082 const char *event, *group;
1083 struct strlist *namelist;
1085 fd = open_kprobe_events(true);
1086 /* Get current event names */
1087 namelist = get_kprobe_trace_event_names(fd, false);
1089 printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":");
1090 for (i = 0; i < ntevs; i++) {
1095 if (pev->point.function)
1096 event = pev->point.function;
1098 event = tev->point.symbol;
1102 group = PERFPROBE_GROUP;
1104 /* Get an unused new event name */
1105 get_new_event_name(buf, 64, event, namelist, allow_suffix);
1108 tev->event = xstrdup(event);
1109 tev->group = xstrdup(group);
1110 write_kprobe_trace_event(fd, tev);
1111 /* Add added event name to namelist */
1112 strlist__add(namelist, event);
1114 /* Trick here - save current event/group */
1117 pev->event = tev->event;
1118 pev->group = tev->group;
1119 show_perf_probe_event(pev);
1120 /* Trick here - restore current event/group */
1121 pev->event = (char *)event;
1122 pev->group = (char *)group;
1125 * Probes after the first probe which comes from same
1126 * user input are always allowed to add suffix, because
1127 * there might be several addresses corresponding to
1130 allow_suffix = true;
1132 /* Show how to use the event. */
1133 printf("\nYou can now use it on all perf tools, such as:\n\n");
1134 printf("\tperf record -e %s:%s -a sleep 1\n\n", tev->group, tev->event);
1136 strlist__delete(namelist);
1140 static int convert_to_kprobe_trace_events(struct perf_probe_event *pev,
1141 struct kprobe_trace_event **tevs)
1145 struct kprobe_trace_event *tev;
1147 /* Convert perf_probe_event with debuginfo */
1148 ntevs = try_to_find_kprobe_trace_events(pev, tevs);
1152 /* Allocate trace event buffer */
1154 tev = *tevs = xzalloc(sizeof(struct kprobe_trace_event));
1156 /* Copy parameters */
1157 tev->point.symbol = xstrdup(pev->point.function);
1158 tev->point.offset = pev->point.offset;
1159 tev->nargs = pev->nargs;
1161 tev->args = xzalloc(sizeof(struct kprobe_trace_arg)
1163 for (i = 0; i < tev->nargs; i++) {
1164 if (pev->args[i].name)
1165 tev->args[i].name = xstrdup(pev->args[i].name);
1166 tev->args[i].value = xstrdup(pev->args[i].var);
1167 if (pev->args[i].type)
1168 tev->args[i].type = xstrdup(pev->args[i].type);
1172 /* Currently just checking function name from symbol map */
1173 sym = map__find_symbol_by_name(kmaps[MAP__FUNCTION],
1174 tev->point.symbol, NULL);
1176 die("Kernel symbol \'%s\' not found - probe not added.",
1182 struct __event_package {
1183 struct perf_probe_event *pev;
1184 struct kprobe_trace_event *tevs;
1188 void add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
1192 struct __event_package *pkgs;
1194 pkgs = xzalloc(sizeof(struct __event_package) * npevs);
1196 /* Init vmlinux path */
1199 /* Loop 1: convert all events */
1200 for (i = 0; i < npevs; i++) {
1201 pkgs[i].pev = &pevs[i];
1202 /* Convert with or without debuginfo */
1203 pkgs[i].ntevs = convert_to_kprobe_trace_events(pkgs[i].pev,
1207 /* Loop 2: add all events */
1208 for (i = 0; i < npevs; i++)
1209 __add_kprobe_trace_events(pkgs[i].pev, pkgs[i].tevs,
1210 pkgs[i].ntevs, force_add);
1211 /* TODO: cleanup all trace events? */
1214 static void __del_trace_kprobe_event(int fd, struct str_node *ent)
1220 /* Convert from perf-probe event to trace-kprobe event */
1221 if (e_snprintf(buf, 128, "-:%s", ent->s) < 0)
1222 die("Failed to copy event.");
1223 p = strchr(buf + 2, ':');
1225 die("Internal error: %s should have ':' but not.", ent->s);
1228 pr_debug("Writing event: %s\n", buf);
1229 ret = write(fd, buf, strlen(buf));
1231 die("Failed to write event: %s", strerror(errno));
1232 printf("Remove event: %s\n", ent->s);
1235 static void del_trace_kprobe_event(int fd, const char *group,
1236 const char *event, struct strlist *namelist)
1239 struct str_node *ent, *n;
1242 if (e_snprintf(buf, 128, "%s:%s", group, event) < 0)
1243 die("Failed to copy event.");
1245 if (strpbrk(buf, "*?")) { /* Glob-exp */
1246 strlist__for_each_safe(ent, n, namelist)
1247 if (strglobmatch(ent->s, buf)) {
1249 __del_trace_kprobe_event(fd, ent);
1250 strlist__remove(namelist, ent);
1253 ent = strlist__find(namelist, buf);
1256 __del_trace_kprobe_event(fd, ent);
1257 strlist__remove(namelist, ent);
1261 pr_info("Info: event \"%s\" does not exist, could not remove it.\n", buf);
1264 void del_perf_probe_events(struct strlist *dellist)
1267 const char *group, *event;
1269 struct str_node *ent;
1270 struct strlist *namelist;
1272 fd = open_kprobe_events(true);
1273 /* Get current event names */
1274 namelist = get_kprobe_trace_event_names(fd, true);
1276 strlist__for_each(ent, dellist) {
1277 str = xstrdup(ent->s);
1278 pr_debug("Parsing: %s\n", str);
1279 p = strchr(str, ':');
1288 pr_debug("Group: %s, Event: %s\n", group, event);
1289 del_trace_kprobe_event(fd, group, event, namelist);
1292 strlist__delete(namelist);