1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * probe-file.c : operate ftrace k/uprobe events files
5 * Written by Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
10 #include <sys/types.h>
13 #include <linux/zalloc.h>
14 #include "namespaces.h"
17 #include "strfilter.h"
24 #include <api/fs/tracing_path.h>
25 #include <api/fs/fs.h>
26 #include "probe-event.h"
27 #include "probe-file.h"
29 #include "perf_regs.h"
32 /* 4096 - 2 ('\n' + '\0') */
33 #define MAX_CMDLEN 4094
35 static bool print_common_warning(int err, bool readwrite)
38 pr_warning("No permission to %s tracefs.\nPlease %s\n",
39 readwrite ? "write" : "read",
40 readwrite ? "run this command again with sudo." :
41 "try 'sudo mount -o remount,mode=755 /sys/kernel/tracing/'");
48 static bool print_configure_probe_event(int kerr, int uerr)
50 const char *config, *file;
52 if (kerr == -ENOENT && uerr == -ENOENT) {
53 file = "{k,u}probe_events";
54 config = "CONFIG_KPROBE_EVENTS=y and CONFIG_UPROBE_EVENTS=y";
55 } else if (kerr == -ENOENT) {
56 file = "kprobe_events";
57 config = "CONFIG_KPROBE_EVENTS=y";
58 } else if (uerr == -ENOENT) {
59 file = "uprobe_events";
60 config = "CONFIG_UPROBE_EVENTS=y";
64 if (!debugfs__configured() && !tracefs__configured())
65 pr_warning("Debugfs or tracefs is not mounted\n"
66 "Please try 'sudo mount -t tracefs nodev /sys/kernel/tracing/'\n");
68 pr_warning("%s/%s does not exist.\nPlease rebuild kernel with %s.\n",
69 tracing_path_mount(), file, config);
74 static void print_open_warning(int err, bool uprobe, bool readwrite)
76 char sbuf[STRERR_BUFSIZE];
78 if (print_common_warning(err, readwrite))
81 if (print_configure_probe_event(uprobe ? 0 : err, uprobe ? err : 0))
84 pr_warning("Failed to open %s/%cprobe_events: %s\n",
85 tracing_path_mount(), uprobe ? 'u' : 'k',
86 str_error_r(-err, sbuf, sizeof(sbuf)));
89 static void print_both_open_warning(int kerr, int uerr, bool readwrite)
91 char sbuf[STRERR_BUFSIZE];
93 if (kerr == uerr && print_common_warning(kerr, readwrite))
96 if (print_configure_probe_event(kerr, uerr))
100 pr_warning("Failed to open %s/kprobe_events: %s.\n",
101 tracing_path_mount(),
102 str_error_r(-kerr, sbuf, sizeof(sbuf)));
104 pr_warning("Failed to open %s/uprobe_events: %s.\n",
105 tracing_path_mount(),
106 str_error_r(-uerr, sbuf, sizeof(sbuf)));
109 int open_trace_file(const char *trace_file, bool readwrite)
114 ret = e_snprintf(buf, PATH_MAX, "%s/%s", tracing_path_mount(), trace_file);
116 pr_debug("Opening %s write=%d\n", buf, readwrite);
117 if (readwrite && !probe_event_dry_run)
118 ret = open(buf, O_RDWR | O_APPEND, 0);
120 ret = open(buf, O_RDONLY, 0);
128 static int open_kprobe_events(bool readwrite)
130 return open_trace_file("kprobe_events", readwrite);
133 static int open_uprobe_events(bool readwrite)
135 return open_trace_file("uprobe_events", readwrite);
138 int probe_file__open(int flag)
142 if (flag & PF_FL_UPROBE)
143 fd = open_uprobe_events(flag & PF_FL_RW);
145 fd = open_kprobe_events(flag & PF_FL_RW);
147 print_open_warning(fd, flag & PF_FL_UPROBE, flag & PF_FL_RW);
152 int probe_file__open_both(int *kfd, int *ufd, int flag)
157 *kfd = open_kprobe_events(flag & PF_FL_RW);
158 *ufd = open_uprobe_events(flag & PF_FL_RW);
159 if (*kfd < 0 && *ufd < 0) {
160 print_both_open_warning(*kfd, *ufd, flag & PF_FL_RW);
167 /* Get raw string list of current kprobe_events or uprobe_events */
168 struct strlist *probe_file__get_rawlist(int fd)
172 char buf[MAX_CMDLEN];
179 sl = strlist__new(NULL, NULL);
187 fp = fdopen(fddup, "r");
189 goto out_close_fddup;
192 p = fgets(buf, MAX_CMDLEN, fp);
199 ret = strlist__add(sl, buf);
201 pr_debug("strlist__add failed (%d)\n", ret);
219 static struct strlist *__probe_file__get_namelist(int fd, bool include_group)
222 struct strlist *sl, *rawlist;
223 struct str_node *ent;
224 struct probe_trace_event tev;
227 memset(&tev, 0, sizeof(tev));
228 rawlist = probe_file__get_rawlist(fd);
231 sl = strlist__new(NULL, NULL);
232 strlist__for_each_entry(ent, rawlist) {
233 ret = parse_probe_trace_command(ent->s, &tev);
237 ret = e_snprintf(buf, 128, "%s:%s", tev.group,
240 ret = strlist__add(sl, buf);
242 ret = strlist__add(sl, tev.event);
243 clear_probe_trace_event(&tev);
244 /* Skip if there is same name multi-probe event in the list */
250 strlist__delete(rawlist);
259 /* Get current perf-probe event names */
260 struct strlist *probe_file__get_namelist(int fd)
262 return __probe_file__get_namelist(fd, false);
265 int probe_file__add_event(int fd, struct probe_trace_event *tev)
268 char *buf = synthesize_probe_trace_command(tev);
269 char sbuf[STRERR_BUFSIZE];
272 pr_debug("Failed to synthesize probe trace event.\n");
276 pr_debug("Writing event: %s\n", buf);
277 if (!probe_event_dry_run) {
278 if (write(fd, buf, strlen(buf)) < (int)strlen(buf)) {
280 pr_warning("Failed to write event: %s\n",
281 str_error_r(errno, sbuf, sizeof(sbuf)));
289 static int __del_trace_probe_event(int fd, struct str_node *ent)
295 /* Convert from perf-probe event to trace-probe event */
296 ret = e_snprintf(buf, 128, "-:%s", ent->s);
300 p = strchr(buf + 2, ':');
302 pr_debug("Internal error: %s should have ':' but not.\n",
309 pr_debug("Writing event: %s\n", buf);
310 ret = write(fd, buf, strlen(buf));
318 pr_warning("Failed to delete event: %s\n",
319 str_error_r(-ret, buf, sizeof(buf)));
323 int probe_file__get_events(int fd, struct strfilter *filter,
324 struct strlist *plist)
326 struct strlist *namelist;
327 struct str_node *ent;
334 namelist = __probe_file__get_namelist(fd, true);
338 strlist__for_each_entry(ent, namelist) {
339 p = strchr(ent->s, ':');
340 if ((p && strfilter__compare(filter, p + 1)) ||
341 strfilter__compare(filter, ent->s)) {
342 ret = strlist__add(plist, ent->s);
343 if (ret == -ENOMEM) {
344 pr_err("strlist__add failed with -ENOMEM\n");
351 strlist__delete(namelist);
356 int probe_file__del_strlist(int fd, struct strlist *namelist)
359 struct str_node *ent;
361 strlist__for_each_entry(ent, namelist) {
362 ret = __del_trace_probe_event(fd, ent);
369 int probe_file__del_events(int fd, struct strfilter *filter)
371 struct strlist *namelist;
374 namelist = strlist__new(NULL, NULL);
378 ret = probe_file__get_events(fd, filter, namelist);
382 ret = probe_file__del_strlist(fd, namelist);
384 strlist__delete(namelist);
388 /* Caller must ensure to remove this entry from list */
389 static void probe_cache_entry__delete(struct probe_cache_entry *entry)
392 BUG_ON(!list_empty(&entry->node));
394 strlist__delete(entry->tevlist);
395 clear_perf_probe_event(&entry->pev);
401 static struct probe_cache_entry *
402 probe_cache_entry__new(struct perf_probe_event *pev)
404 struct probe_cache_entry *entry = zalloc(sizeof(*entry));
407 INIT_LIST_HEAD(&entry->node);
408 entry->tevlist = strlist__new(NULL, NULL);
412 entry->spev = synthesize_perf_probe_command(pev);
414 perf_probe_event__copy(&entry->pev, pev) < 0) {
415 probe_cache_entry__delete(entry);
424 int probe_cache_entry__get_event(struct probe_cache_entry *entry,
425 struct probe_trace_event **tevs)
427 struct probe_trace_event *tev;
428 struct str_node *node;
431 ret = strlist__nr_entries(entry->tevlist);
432 if (ret > probe_conf.max_probes)
435 *tevs = zalloc(ret * sizeof(*tev));
440 strlist__for_each_entry(node, entry->tevlist) {
442 ret = parse_probe_trace_command(node->s, tev);
449 /* For the kernel probe caches, pass target = NULL or DSO__NAME_KALLSYMS */
450 static int probe_cache__open(struct probe_cache *pcache, const char *target,
453 char cpath[PATH_MAX];
454 char sbuildid[SBUILD_ID_SIZE];
455 char *dir_name = NULL;
456 bool is_kallsyms = false;
460 if (target && build_id_cache__cached(target)) {
461 /* This is a cached buildid */
462 strlcpy(sbuildid, target, SBUILD_ID_SIZE);
463 dir_name = build_id_cache__linkname(sbuildid, NULL, 0);
467 if (!target || !strcmp(target, DSO__NAME_KALLSYMS)) {
468 target = DSO__NAME_KALLSYMS;
470 ret = sysfs__sprintf_build_id("/", sbuildid);
472 nsinfo__mountns_enter(nsi, &nsc);
473 ret = filename__sprintf_build_id(target, sbuildid);
474 nsinfo__mountns_exit(&nsc);
478 pr_debug("Failed to get build-id from %s.\n", target);
482 /* If we have no buildid cache, make it */
483 if (!build_id_cache__cached(sbuildid)) {
484 ret = build_id_cache__add_s(sbuildid, target, nsi,
487 pr_debug("Failed to add build-id cache: %s\n", target);
492 dir_name = build_id_cache__cachedir(sbuildid, target, nsi, is_kallsyms,
496 pr_debug("Failed to get cache from %s\n", target);
500 snprintf(cpath, PATH_MAX, "%s/probes", dir_name);
501 fd = open(cpath, O_CREAT | O_RDWR, 0644);
503 pr_debug("Failed to open cache(%d): %s\n", fd, cpath);
510 static int probe_cache__load(struct probe_cache *pcache)
512 struct probe_cache_entry *entry = NULL;
513 char buf[MAX_CMDLEN], *p;
517 fddup = dup(pcache->fd);
520 fp = fdopen(fddup, "r");
527 if (!fgets(buf, MAX_CMDLEN, fp))
529 p = strchr(buf, '\n');
532 /* #perf_probe_event or %sdt_event */
533 if (buf[0] == '#' || buf[0] == '%') {
534 entry = probe_cache_entry__new(NULL);
541 entry->spev = strdup(buf + 1);
543 ret = parse_perf_probe_command(buf + 1,
548 probe_cache_entry__delete(entry);
551 list_add_tail(&entry->node, &pcache->entries);
552 } else { /* trace_probe_event */
557 ret = strlist__add(entry->tevlist, buf);
558 if (ret == -ENOMEM) {
559 pr_err("strlist__add failed with -ENOMEM\n");
569 static struct probe_cache *probe_cache__alloc(void)
571 struct probe_cache *pcache = zalloc(sizeof(*pcache));
574 INIT_LIST_HEAD(&pcache->entries);
575 pcache->fd = -EINVAL;
580 void probe_cache__purge(struct probe_cache *pcache)
582 struct probe_cache_entry *entry, *n;
584 list_for_each_entry_safe(entry, n, &pcache->entries, node) {
585 list_del_init(&entry->node);
586 probe_cache_entry__delete(entry);
590 void probe_cache__delete(struct probe_cache *pcache)
595 probe_cache__purge(pcache);
601 struct probe_cache *probe_cache__new(const char *target, struct nsinfo *nsi)
603 struct probe_cache *pcache = probe_cache__alloc();
609 ret = probe_cache__open(pcache, target, nsi);
611 pr_debug("Cache open error: %d\n", ret);
615 ret = probe_cache__load(pcache);
617 pr_debug("Cache read error: %d\n", ret);
624 probe_cache__delete(pcache);
628 static bool streql(const char *a, const char *b)
636 return !strcmp(a, b);
639 struct probe_cache_entry *
640 probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev)
642 struct probe_cache_entry *entry = NULL;
643 char *cmd = synthesize_perf_probe_command(pev);
648 for_each_probe_cache_entry(entry, pcache) {
650 if (entry->pev.event &&
651 streql(entry->pev.event, pev->event) &&
653 streql(entry->pev.group, pev->group)))
658 /* Hit if same event name or same command-string */
660 (streql(entry->pev.group, pev->group) &&
661 streql(entry->pev.event, pev->event))) ||
662 (!strcmp(entry->spev, cmd)))
672 struct probe_cache_entry *
673 probe_cache__find_by_name(struct probe_cache *pcache,
674 const char *group, const char *event)
676 struct probe_cache_entry *entry = NULL;
678 for_each_probe_cache_entry(entry, pcache) {
679 /* Hit if same event name or same command-string */
680 if (streql(entry->pev.group, group) &&
681 streql(entry->pev.event, event))
690 int probe_cache__add_entry(struct probe_cache *pcache,
691 struct perf_probe_event *pev,
692 struct probe_trace_event *tevs, int ntevs)
694 struct probe_cache_entry *entry = NULL;
698 if (!pcache || !pev || !tevs || ntevs <= 0) {
703 /* Remove old cache entry */
704 entry = probe_cache__find(pcache, pev);
706 list_del_init(&entry->node);
707 probe_cache_entry__delete(entry);
711 entry = probe_cache_entry__new(pev);
715 for (i = 0; i < ntevs; i++) {
716 if (!tevs[i].point.symbol)
719 command = synthesize_probe_trace_command(&tevs[i]);
722 ret = strlist__add(entry->tevlist, command);
723 if (ret == -ENOMEM) {
724 pr_err("strlist__add failed with -ENOMEM\n");
730 list_add_tail(&entry->node, &pcache->entries);
731 pr_debug("Added probe cache: %d\n", ntevs);
735 pr_debug("Failed to add probe caches\n");
736 probe_cache_entry__delete(entry);
740 #ifdef HAVE_GELF_GETNOTE_SUPPORT
741 static unsigned long long sdt_note__get_addr(struct sdt_note *note)
744 (unsigned long long)note->addr.a32[SDT_NOTE_IDX_LOC] :
745 (unsigned long long)note->addr.a64[SDT_NOTE_IDX_LOC];
748 static unsigned long long sdt_note__get_ref_ctr_offset(struct sdt_note *note)
751 (unsigned long long)note->addr.a32[SDT_NOTE_IDX_REFCTR] :
752 (unsigned long long)note->addr.a64[SDT_NOTE_IDX_REFCTR];
755 static const char * const type_to_suffix[] = {
756 ":s64", "", "", "", ":s32", "", ":s16", ":s8",
757 "", ":u8", ":u16", "", ":u32", "", "", "", ":u64"
761 * Isolate the string number and convert it into a decimal value;
762 * this will be an index to get suffix of the uprobe name (defining
765 static int sdt_arg_parse_size(char *n_ptr, const char **suffix)
769 type_idx = strtol(n_ptr, NULL, 10);
770 if (type_idx < -8 || type_idx > 8) {
771 pr_debug4("Failed to get a valid sdt type\n");
775 *suffix = type_to_suffix[type_idx + 8];
779 static int synthesize_sdt_probe_arg(struct strbuf *buf, int i, const char *arg)
781 char *op, *desc = strdup(arg), *new_op = NULL;
782 const char *suffix = "";
786 pr_debug4("Allocation error\n");
791 * Argument is in N@OP format. N is size of the argument and OP is
792 * the actual assembly operand. N can be omitted; in that case
793 * argument is just OP(without @).
795 op = strchr(desc, '@');
800 if (sdt_arg_parse_size(desc, &suffix))
806 ret = arch_sdt_arg_parse_op(op, &new_op);
811 if (ret == SDT_ARG_VALID) {
812 ret = strbuf_addf(buf, " arg%d=%s%s", i + 1, new_op, suffix);
824 static char *synthesize_sdt_probe_command(struct sdt_note *note,
825 const char *pathname,
830 int i, args_count, err;
831 unsigned long long ref_ctr_offset;
835 if (strbuf_init(&buf, 32) < 0)
838 err = strbuf_addf(&buf, "p:%s/%s %s:0x%llx",
839 sdtgrp, note->name, pathname,
840 sdt_note__get_addr(note));
842 ref_ctr_offset = sdt_note__get_ref_ctr_offset(note);
843 if (ref_ctr_offset && err >= 0)
844 err = strbuf_addf(&buf, "(0x%llx)", ref_ctr_offset);
853 char **args = argv_split(note->args, &args_count);
858 for (i = 0; i < args_count; ) {
860 * FIXUP: Arm64 ELF section '.note.stapsdt' uses string
861 * format "-4@[sp, NUM]" if a probe is to access data in
862 * the stack, e.g. below is an example for the SDT
865 * Arguments: -4@[sp, 12] -4@[sp, 8] -4@[sp, 4]
867 * Since the string introduces an extra space character
868 * in the middle of square brackets, the argument is
869 * divided into two items. Fixup for this case, if an
870 * item contains sub string "[sp,", need to concatenate
873 if (strstr(args[i], "[sp,") && (i+1) < args_count) {
874 err = asprintf(&arg, "%s %s", args[i], args[i+1]);
877 err = asprintf(&arg, "%s", args[i]);
881 /* Failed to allocate memory */
887 if (synthesize_sdt_probe_arg(&buf, arg_idx, arg) < 0) {
901 ret = strbuf_detach(&buf, NULL);
903 strbuf_release(&buf);
907 int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname)
909 struct probe_cache_entry *entry = NULL;
910 struct list_head sdtlist;
911 struct sdt_note *note;
916 INIT_LIST_HEAD(&sdtlist);
917 ret = get_sdt_note_list(&sdtlist, pathname);
919 pr_debug4("Failed to get sdt note: %d\n", ret);
922 list_for_each_entry(note, &sdtlist, note_list) {
923 ret = snprintf(sdtgrp, 64, "sdt_%s", note->provider);
926 /* Try to find same-name entry */
927 entry = probe_cache__find_by_name(pcache, sdtgrp, note->name);
929 entry = probe_cache_entry__new(NULL);
935 ret = asprintf(&entry->spev, "%s:%s=%s", sdtgrp,
936 note->name, note->name);
939 entry->pev.event = strdup(note->name);
940 entry->pev.group = strdup(sdtgrp);
941 list_add_tail(&entry->node, &pcache->entries);
943 buf = synthesize_sdt_probe_command(note, pathname, sdtgrp);
949 ret = strlist__add(entry->tevlist, buf);
954 if (ret == -ENOMEM) {
955 pr_err("strlist__add failed with -ENOMEM\n");
960 list_del_init(&entry->node);
961 probe_cache_entry__delete(entry);
963 cleanup_sdt_note_list(&sdtlist);
968 static int probe_cache_entry__write(struct probe_cache_entry *entry, int fd)
970 struct str_node *snode;
973 const char *prefix = entry->sdt ? "%" : "#";
975 /* Save stat for rollback */
976 ret = fstat(fd, &st);
980 pr_debug("Writing cache: %s%s\n", prefix, entry->spev);
981 iov[0].iov_base = (void *)prefix; iov[0].iov_len = 1;
982 iov[1].iov_base = entry->spev; iov[1].iov_len = strlen(entry->spev);
983 iov[2].iov_base = (void *)"\n"; iov[2].iov_len = 1;
984 ret = writev(fd, iov, 3);
985 if (ret < (int)iov[1].iov_len + 2)
988 strlist__for_each_entry(snode, entry->tevlist) {
989 iov[0].iov_base = (void *)snode->s;
990 iov[0].iov_len = strlen(snode->s);
991 iov[1].iov_base = (void *)"\n"; iov[1].iov_len = 1;
992 ret = writev(fd, iov, 2);
993 if (ret < (int)iov[0].iov_len + 1)
999 /* Rollback to avoid cache file corruption */
1002 if (ftruncate(fd, st.st_size) < 0)
1008 int probe_cache__commit(struct probe_cache *pcache)
1010 struct probe_cache_entry *entry;
1013 /* TBD: if we do not update existing entries, skip it */
1014 ret = lseek(pcache->fd, 0, SEEK_SET);
1018 ret = ftruncate(pcache->fd, 0);
1022 for_each_probe_cache_entry(entry, pcache) {
1023 ret = probe_cache_entry__write(entry, pcache->fd);
1024 pr_debug("Cache committed: %d\n", ret);
1032 static bool probe_cache_entry__compare(struct probe_cache_entry *entry,
1033 struct strfilter *filter)
1035 char buf[128], *ptr = entry->spev;
1037 if (entry->pev.event) {
1038 snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event);
1041 return strfilter__compare(filter, ptr);
1044 int probe_cache__filter_purge(struct probe_cache *pcache,
1045 struct strfilter *filter)
1047 struct probe_cache_entry *entry, *tmp;
1049 list_for_each_entry_safe(entry, tmp, &pcache->entries, node) {
1050 if (probe_cache_entry__compare(entry, filter)) {
1051 pr_info("Removed cached event: %s\n", entry->spev);
1052 list_del_init(&entry->node);
1053 probe_cache_entry__delete(entry);
1059 static int probe_cache__show_entries(struct probe_cache *pcache,
1060 struct strfilter *filter)
1062 struct probe_cache_entry *entry;
1064 for_each_probe_cache_entry(entry, pcache) {
1065 if (probe_cache_entry__compare(entry, filter))
1066 printf("%s\n", entry->spev);
1071 /* Show all cached probes */
1072 int probe_cache__show_all_caches(struct strfilter *filter)
1074 struct probe_cache *pcache;
1075 struct strlist *bidlist;
1076 struct str_node *nd;
1077 char *buf = strfilter__string(filter);
1079 pr_debug("list cache with filter: %s\n", buf);
1082 bidlist = build_id_cache__list_all(true);
1084 pr_debug("Failed to get buildids: %d\n", errno);
1087 strlist__for_each_entry(nd, bidlist) {
1088 pcache = probe_cache__new(nd->s, NULL);
1091 if (!list_empty(&pcache->entries)) {
1092 buf = build_id_cache__origname(nd->s);
1093 printf("%s (%s):\n", buf, nd->s);
1095 probe_cache__show_entries(pcache, filter);
1097 probe_cache__delete(pcache);
1099 strlist__delete(bidlist);
1104 enum ftrace_readme {
1105 FTRACE_README_PROBE_TYPE_X = 0,
1106 FTRACE_README_KRETPROBE_OFFSET,
1107 FTRACE_README_UPROBE_REF_CTR,
1108 FTRACE_README_USER_ACCESS,
1109 FTRACE_README_MULTIPROBE_EVENT,
1110 FTRACE_README_IMMEDIATE_VALUE,
1115 const char *pattern;
1117 } ftrace_readme_table[] = {
1118 #define DEFINE_TYPE(idx, pat) \
1119 [idx] = {.pattern = pat, .avail = false}
1120 DEFINE_TYPE(FTRACE_README_PROBE_TYPE_X, "*type: * x8/16/32/64,*"),
1121 DEFINE_TYPE(FTRACE_README_KRETPROBE_OFFSET, "*place (kretprobe): *"),
1122 DEFINE_TYPE(FTRACE_README_UPROBE_REF_CTR, "*ref_ctr_offset*"),
1123 DEFINE_TYPE(FTRACE_README_USER_ACCESS, "*u]<offset>*"),
1124 DEFINE_TYPE(FTRACE_README_MULTIPROBE_EVENT, "*Create/append/*"),
1125 DEFINE_TYPE(FTRACE_README_IMMEDIATE_VALUE, "*\\imm-value,*"),
1128 static bool scan_ftrace_readme(enum ftrace_readme type)
1135 static bool scanned = false;
1140 fd = open_trace_file("README", false);
1144 fp = fdopen(fd, "r");
1150 while (getline(&buf, &len, fp) > 0)
1151 for (enum ftrace_readme i = 0; i < FTRACE_README_END; i++)
1152 if (!ftrace_readme_table[i].avail)
1153 ftrace_readme_table[i].avail =
1154 strglobmatch(buf, ftrace_readme_table[i].pattern);
1161 if (type >= FTRACE_README_END)
1164 return ftrace_readme_table[type].avail;
1167 bool probe_type_is_available(enum probe_type type)
1169 if (type >= PROBE_TYPE_END)
1171 else if (type == PROBE_TYPE_X)
1172 return scan_ftrace_readme(FTRACE_README_PROBE_TYPE_X);
1177 bool kretprobe_offset_is_supported(void)
1179 return scan_ftrace_readme(FTRACE_README_KRETPROBE_OFFSET);
1182 bool uprobe_ref_ctr_is_supported(void)
1184 return scan_ftrace_readme(FTRACE_README_UPROBE_REF_CTR);
1187 bool user_access_is_supported(void)
1189 return scan_ftrace_readme(FTRACE_README_USER_ACCESS);
1192 bool multiprobe_event_is_supported(void)
1194 return scan_ftrace_readme(FTRACE_README_MULTIPROBE_EVENT);
1197 bool immediate_value_is_supported(void)
1199 return scan_ftrace_readme(FTRACE_README_IMMEDIATE_VALUE);