summaryrefslogtreecommitdiffstats
path: root/tools/perf/builtin-probe.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--tools/perf/builtin-probe.c748
1 files changed, 748 insertions, 0 deletions
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
new file mode 100644
index 000000000..215da628d
--- /dev/null
+++ b/tools/perf/builtin-probe.c
@@ -0,0 +1,748 @@
+/*
+ * builtin-probe.c
+ *
+ * Builtin probe command: Set up probe events by C expression
+ *
+ * Written by Masami Hiramatsu <mhiramat@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+#include <sys/utsname.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "perf.h"
+#include "builtin.h"
+#include "util/util.h"
+#include "util/strlist.h"
+#include "util/strfilter.h"
+#include "util/symbol.h"
+#include "util/debug.h"
+#include <subcmd/parse-options.h>
+#include "util/probe-finder.h"
+#include "util/probe-event.h"
+#include "util/probe-file.h"
+
+#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
+#define DEFAULT_FUNC_FILTER "!_*"
+#define DEFAULT_LIST_FILTER "*"
+
+/* Session management structure */
+static struct {
+ int command; /* Command short_name */
+ bool list_events;
+ bool uprobes;
+ bool quiet;
+ bool target_used;
+ int nevents;
+ struct perf_probe_event events[MAX_PROBES];
+ struct line_range line_range;
+ char *target;
+ struct strfilter *filter;
+ struct nsinfo *nsi;
+} params;
+
+/* Parse an event definition. Note that any error must die. */
+static int parse_probe_event(const char *str)
+{
+ struct perf_probe_event *pev = &params.events[params.nevents];
+ int ret;
+
+ pr_debug("probe-definition(%d): %s\n", params.nevents, str);
+ if (++params.nevents == MAX_PROBES) {
+ pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
+ return -1;
+ }
+
+ pev->uprobes = params.uprobes;
+ if (params.target) {
+ pev->target = strdup(params.target);
+ if (!pev->target)
+ return -ENOMEM;
+ params.target_used = true;
+ }
+
+ pev->nsi = nsinfo__get(params.nsi);
+
+ /* Parse a perf-probe command into event */
+ ret = parse_perf_probe_command(str, pev);
+ pr_debug("%d arguments\n", pev->nargs);
+
+ return ret;
+}
+
+static int params_add_filter(const char *str)
+{
+ const char *err = NULL;
+ int ret = 0;
+
+ pr_debug2("Add filter: %s\n", str);
+ if (!params.filter) {
+ params.filter = strfilter__new(str, &err);
+ if (!params.filter)
+ ret = err ? -EINVAL : -ENOMEM;
+ } else
+ ret = strfilter__or(params.filter, str, &err);
+
+ if (ret == -EINVAL) {
+ pr_err("Filter parse error at %td.\n", err - str + 1);
+ pr_err("Source: \"%s\"\n", str);
+ pr_err(" %*c\n", (int)(err - str + 1), '^');
+ }
+
+ return ret;
+}
+
+static int set_target(const char *ptr)
+{
+ int found = 0;
+ const char *buf;
+
+ /*
+ * The first argument after options can be an absolute path
+ * to an executable / library or kernel module.
+ *
+ * TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
+ * short module name.
+ */
+ if (!params.target && ptr && *ptr == '/') {
+ params.target = strdup(ptr);
+ if (!params.target)
+ return -ENOMEM;
+ params.target_used = false;
+
+ found = 1;
+ buf = ptr + (strlen(ptr) - 3);
+
+ if (strcmp(buf, ".ko"))
+ params.uprobes = true;
+
+ }
+
+ return found;
+}
+
+static int parse_probe_event_argv(int argc, const char **argv)
+{
+ int i, len, ret, found_target;
+ char *buf;
+
+ found_target = set_target(argv[0]);
+ if (found_target < 0)
+ return found_target;
+
+ if (found_target && argc == 1)
+ return 0;
+
+ /* Bind up rest arguments */
+ len = 0;
+ for (i = 0; i < argc; i++) {
+ if (i == 0 && found_target)
+ continue;
+
+ len += strlen(argv[i]) + 1;
+ }
+ buf = zalloc(len + 1);
+ if (buf == NULL)
+ return -ENOMEM;
+ len = 0;
+ for (i = 0; i < argc; i++) {
+ if (i == 0 && found_target)
+ continue;
+
+ len += sprintf(&buf[len], "%s ", argv[i]);
+ }
+ ret = parse_probe_event(buf);
+ free(buf);
+ return ret;
+}
+
+static int opt_set_target(const struct option *opt, const char *str,
+ int unset __maybe_unused)
+{
+ int ret = -ENOENT;
+ char *tmp;
+
+ if (str) {
+ if (!strcmp(opt->long_name, "exec"))
+ params.uprobes = true;
+ else if (!strcmp(opt->long_name, "module"))
+ params.uprobes = false;
+ else
+ return ret;
+
+ /* Expand given path to absolute path, except for modulename */
+ if (params.uprobes || strchr(str, '/')) {
+ tmp = nsinfo__realpath(str, params.nsi);
+ if (!tmp) {
+ pr_warning("Failed to get the absolute path of %s: %m\n", str);
+ return ret;
+ }
+ } else {
+ tmp = strdup(str);
+ if (!tmp)
+ return -ENOMEM;
+ }
+ free(params.target);
+ params.target = tmp;
+ params.target_used = false;
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static int opt_set_target_ns(const struct option *opt __maybe_unused,
+ const char *str, int unset __maybe_unused)
+{
+ int ret = -ENOENT;
+ pid_t ns_pid;
+ struct nsinfo *nsip;
+
+ if (str) {
+ errno = 0;
+ ns_pid = (pid_t)strtol(str, NULL, 10);
+ if (errno != 0) {
+ ret = -errno;
+ pr_warning("Failed to parse %s as a pid: %s\n", str,
+ strerror(errno));
+ return ret;
+ }
+ nsip = nsinfo__new(ns_pid);
+ if (nsip && nsip->need_setns)
+ params.nsi = nsinfo__get(nsip);
+ nsinfo__put(nsip);
+
+ ret = 0;
+ }
+
+ return ret;
+}
+
+
+/* Command option callbacks */
+
+#ifdef HAVE_DWARF_SUPPORT
+static int opt_show_lines(const struct option *opt,
+ const char *str, int unset __maybe_unused)
+{
+ int ret = 0;
+
+ if (!str)
+ return 0;
+
+ if (params.command == 'L') {
+ pr_warning("Warning: more than one --line options are"
+ " detected. Only the first one is valid.\n");
+ return 0;
+ }
+
+ params.command = opt->short_name;
+ ret = parse_line_range_desc(str, &params.line_range);
+
+ return ret;
+}
+
+static int opt_show_vars(const struct option *opt,
+ const char *str, int unset __maybe_unused)
+{
+ struct perf_probe_event *pev = &params.events[params.nevents];
+ int ret;
+
+ if (!str)
+ return 0;
+
+ ret = parse_probe_event(str);
+ if (!ret && pev->nargs != 0) {
+ pr_err(" Error: '--vars' doesn't accept arguments.\n");
+ return -EINVAL;
+ }
+ params.command = opt->short_name;
+
+ return ret;
+}
+#else
+# define opt_show_lines NULL
+# define opt_show_vars NULL
+#endif
+static int opt_add_probe_event(const struct option *opt,
+ const char *str, int unset __maybe_unused)
+{
+ if (str) {
+ params.command = opt->short_name;
+ return parse_probe_event(str);
+ }
+
+ return 0;
+}
+
+static int opt_set_filter_with_command(const struct option *opt,
+ const char *str, int unset)
+{
+ if (!unset)
+ params.command = opt->short_name;
+
+ if (str)
+ return params_add_filter(str);
+
+ return 0;
+}
+
+static int opt_set_filter(const struct option *opt __maybe_unused,
+ const char *str, int unset __maybe_unused)
+{
+ if (str)
+ return params_add_filter(str);
+
+ return 0;
+}
+
+static int init_params(void)
+{
+ return line_range__init(&params.line_range);
+}
+
+static void cleanup_params(void)
+{
+ int i;
+
+ for (i = 0; i < params.nevents; i++)
+ clear_perf_probe_event(params.events + i);
+ line_range__clear(&params.line_range);
+ free(params.target);
+ strfilter__delete(params.filter);
+ nsinfo__put(params.nsi);
+ memset(&params, 0, sizeof(params));
+}
+
+static void pr_err_with_code(const char *msg, int err)
+{
+ char sbuf[STRERR_BUFSIZE];
+
+ pr_err("%s", msg);
+ pr_debug(" Reason: %s (Code: %d)",
+ str_error_r(-err, sbuf, sizeof(sbuf)), err);
+ pr_err("\n");
+}
+
+static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
+{
+ int ret;
+ int i, k;
+ const char *event = NULL, *group = NULL;
+
+ ret = init_probe_symbol_maps(pevs->uprobes);
+ if (ret < 0)
+ return ret;
+
+ ret = convert_perf_probe_events(pevs, npevs);
+ if (ret < 0)
+ goto out_cleanup;
+
+ if (params.command == 'D') { /* it shows definition */
+ ret = show_probe_trace_events(pevs, npevs);
+ goto out_cleanup;
+ }
+
+ ret = apply_perf_probe_events(pevs, npevs);
+ if (ret < 0)
+ goto out_cleanup;
+
+ for (i = k = 0; i < npevs; i++)
+ k += pevs[i].ntevs;
+
+ pr_info("Added new event%s\n", (k > 1) ? "s:" : ":");
+ for (i = 0; i < npevs; i++) {
+ struct perf_probe_event *pev = &pevs[i];
+
+ for (k = 0; k < pev->ntevs; k++) {
+ struct probe_trace_event *tev = &pev->tevs[k];
+ /* Skipped events have no event name */
+ if (!tev->event)
+ continue;
+
+ /* We use tev's name for showing new events */
+ show_perf_probe_event(tev->group, tev->event, pev,
+ tev->point.module, false);
+
+ /* Save the last valid name */
+ event = tev->event;
+ group = tev->group;
+ }
+ }
+
+ /* Note that it is possible to skip all events because of blacklist */
+ if (event) {
+ /* Show how to use the event. */
+ pr_info("\nYou can now use it in all perf tools, such as:\n\n");
+ pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
+ }
+
+out_cleanup:
+ cleanup_perf_probe_events(pevs, npevs);
+ exit_probe_symbol_maps();
+ return ret;
+}
+
+static int del_perf_probe_caches(struct strfilter *filter)
+{
+ struct probe_cache *cache;
+ struct strlist *bidlist;
+ struct str_node *nd;
+ int ret;
+
+ bidlist = build_id_cache__list_all(false);
+ if (!bidlist) {
+ ret = -errno;
+ pr_debug("Failed to get buildids: %d\n", ret);
+ return ret ?: -ENOMEM;
+ }
+
+ strlist__for_each_entry(nd, bidlist) {
+ cache = probe_cache__new(nd->s, NULL);
+ if (!cache)
+ continue;
+ if (probe_cache__filter_purge(cache, filter) < 0 ||
+ probe_cache__commit(cache) < 0)
+ pr_warning("Failed to remove entries for %s\n", nd->s);
+ probe_cache__delete(cache);
+ }
+ return 0;
+}
+
+static int perf_del_probe_events(struct strfilter *filter)
+{
+ int ret, ret2, ufd = -1, kfd = -1;
+ char *str = strfilter__string(filter);
+ struct strlist *klist = NULL, *ulist = NULL;
+ struct str_node *ent;
+
+ if (!str)
+ return -EINVAL;
+
+ pr_debug("Delete filter: \'%s\'\n", str);
+
+ if (probe_conf.cache)
+ return del_perf_probe_caches(filter);
+
+ /* Get current event names */
+ ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
+ if (ret < 0)
+ goto out;
+
+ klist = strlist__new(NULL, NULL);
+ ulist = strlist__new(NULL, NULL);
+ if (!klist || !ulist) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = probe_file__get_events(kfd, filter, klist);
+ if (ret == 0) {
+ strlist__for_each_entry(ent, klist)
+ pr_info("Removed event: %s\n", ent->s);
+
+ ret = probe_file__del_strlist(kfd, klist);
+ if (ret < 0)
+ goto error;
+ }
+
+ ret2 = probe_file__get_events(ufd, filter, ulist);
+ if (ret2 == 0) {
+ strlist__for_each_entry(ent, ulist)
+ pr_info("Removed event: %s\n", ent->s);
+
+ ret2 = probe_file__del_strlist(ufd, ulist);
+ if (ret2 < 0)
+ goto error;
+ }
+
+ if (ret == -ENOENT && ret2 == -ENOENT)
+ pr_warning("\"%s\" does not hit any event.\n", str);
+ else
+ ret = 0;
+
+error:
+ if (kfd >= 0)
+ close(kfd);
+ if (ufd >= 0)
+ close(ufd);
+out:
+ strlist__delete(klist);
+ strlist__delete(ulist);
+ free(str);
+
+ return ret;
+}
+
+#ifdef HAVE_DWARF_SUPPORT
+#define PROBEDEF_STR \
+ "[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT [[NAME=]ARG ...]"
+#else
+#define PROBEDEF_STR "[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]"
+#endif
+
+
+static int
+__cmd_probe(int argc, const char **argv)
+{
+ const char * const probe_usage[] = {
+ "perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
+ "perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
+ "perf probe [<options>] --del '[GROUP:]EVENT' ...",
+ "perf probe --list [GROUP:]EVENT ...",
+#ifdef HAVE_DWARF_SUPPORT
+ "perf probe [<options>] --line 'LINEDESC'",
+ "perf probe [<options>] --vars 'PROBEPOINT'",
+#endif
+ "perf probe [<options>] --funcs",
+ NULL
+ };
+ struct option options[] = {
+ OPT_INCR('v', "verbose", &verbose,
+ "be more verbose (show parsed arguments, etc)"),
+ OPT_BOOLEAN('q', "quiet", &params.quiet,
+ "be quiet (do not show any messages)"),
+ OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
+ "list up probe events",
+ opt_set_filter_with_command, DEFAULT_LIST_FILTER),
+ OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
+ opt_set_filter_with_command),
+ OPT_CALLBACK('a', "add", NULL, PROBEDEF_STR,
+ "probe point definition, where\n"
+ "\t\tGROUP:\tGroup name (optional)\n"
+ "\t\tEVENT:\tEvent name\n"
+ "\t\tFUNC:\tFunction name\n"
+ "\t\tOFF:\tOffset from function entry (in byte)\n"
+ "\t\t%return:\tPut the probe at function return\n"
+#ifdef HAVE_DWARF_SUPPORT
+ "\t\tSRC:\tSource code path\n"
+ "\t\tRL:\tRelative line number from function entry.\n"
+ "\t\tAL:\tAbsolute line number in file.\n"
+ "\t\tPT:\tLazy expression of line code.\n"
+ "\t\tARG:\tProbe argument (local variable name or\n"
+ "\t\t\tkprobe-tracer argument format.)\n",
+#else
+ "\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
+#endif
+ opt_add_probe_event),
+ OPT_CALLBACK('D', "definition", NULL, PROBEDEF_STR,
+ "Show trace event definition of given traceevent for k/uprobe_events.",
+ opt_add_probe_event),
+ OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
+ " with existing name"),
+ OPT_CALLBACK('L', "line", NULL,
+ "FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
+ "Show source code lines.", opt_show_lines),
+ OPT_CALLBACK('V', "vars", NULL,
+ "FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
+ "Show accessible variables on PROBEDEF", opt_show_vars),
+ OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars,
+ "Show external variables too (with --vars only)"),
+ OPT_BOOLEAN('\0', "range", &probe_conf.show_location_range,
+ "Show variables location range in scope (with --vars only)"),
+ OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
+ "file", "vmlinux pathname"),
+ OPT_STRING('s', "source", &symbol_conf.source_prefix,
+ "directory", "path to kernel source"),
+ OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines,
+ "Don't search inlined functions"),
+ OPT__DRY_RUN(&probe_event_dry_run),
+ OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes,
+ "Set how many probe points can be found for a probe."),
+ OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
+ "Show potential probe-able functions.",
+ opt_set_filter_with_command, DEFAULT_FUNC_FILTER),
+ OPT_CALLBACK('\0', "filter", NULL,
+ "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
+ "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
+ "\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
+ opt_set_filter),
+ OPT_CALLBACK('x', "exec", NULL, "executable|path",
+ "target executable name or path", opt_set_target),
+ OPT_CALLBACK('m', "module", NULL, "modname|path",
+ "target module name (for online) or path (for offline)",
+ opt_set_target),
+ OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
+ "Enable symbol demangling"),
+ OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
+ "Enable kernel symbol demangling"),
+ OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),
+ OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
+ "Look for files with symbols relative to this directory"),
+ OPT_CALLBACK(0, "target-ns", NULL, "pid",
+ "target pid for namespace contexts", opt_set_target_ns),
+ OPT_END()
+ };
+ int ret;
+
+ set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
+ set_option_flag(options, 'd', "del", PARSE_OPT_EXCLUSIVE);
+ set_option_flag(options, 'D', "definition", PARSE_OPT_EXCLUSIVE);
+ set_option_flag(options, 'l', "list", PARSE_OPT_EXCLUSIVE);
+#ifdef HAVE_DWARF_SUPPORT
+ set_option_flag(options, 'L', "line", PARSE_OPT_EXCLUSIVE);
+ set_option_flag(options, 'V', "vars", PARSE_OPT_EXCLUSIVE);
+#else
+# define set_nobuild(s, l, c) set_option_nobuild(options, s, l, "NO_DWARF=1", c)
+ set_nobuild('L', "line", false);
+ set_nobuild('V', "vars", false);
+ set_nobuild('\0', "externs", false);
+ set_nobuild('\0', "range", false);
+ set_nobuild('k', "vmlinux", true);
+ set_nobuild('s', "source", true);
+ set_nobuild('\0', "no-inlines", true);
+# undef set_nobuild
+#endif
+ set_option_flag(options, 'F', "funcs", PARSE_OPT_EXCLUSIVE);
+
+ argc = parse_options(argc, argv, options, probe_usage,
+ PARSE_OPT_STOP_AT_NON_OPTION);
+ if (argc > 0) {
+ if (strcmp(argv[0], "-") == 0) {
+ usage_with_options_msg(probe_usage, options,
+ "'-' is not supported.\n");
+ }
+ if (params.command && params.command != 'a') {
+ usage_with_options_msg(probe_usage, options,
+ "another command except --add is set.\n");
+ }
+ ret = parse_probe_event_argv(argc, argv);
+ if (ret < 0) {
+ pr_err_with_code(" Error: Command Parse Error.", ret);
+ return ret;
+ }
+ params.command = 'a';
+ }
+
+ if (params.quiet) {
+ if (verbose != 0) {
+ pr_err(" Error: -v and -q are exclusive.\n");
+ return -EINVAL;
+ }
+ verbose = -1;
+ }
+
+ if (probe_conf.max_probes == 0)
+ probe_conf.max_probes = MAX_PROBES;
+
+ /*
+ * Only consider the user's kernel image path if given.
+ */
+ symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
+
+ /*
+ * Except for --list, --del and --add, other command doesn't depend
+ * nor change running kernel. So if user gives offline vmlinux,
+ * ignore its buildid.
+ */
+ if (!strchr("lda", params.command) && symbol_conf.vmlinux_name)
+ symbol_conf.ignore_vmlinux_buildid = true;
+
+ switch (params.command) {
+ case 'l':
+ if (params.uprobes) {
+ pr_err(" Error: Don't use --list with --exec.\n");
+ parse_options_usage(probe_usage, options, "l", true);
+ parse_options_usage(NULL, options, "x", true);
+ return -EINVAL;
+ }
+ ret = show_perf_probe_events(params.filter);
+ if (ret < 0)
+ pr_err_with_code(" Error: Failed to show event list.", ret);
+ return ret;
+ case 'F':
+ ret = show_available_funcs(params.target, params.nsi,
+ params.filter, params.uprobes);
+ if (ret < 0)
+ pr_err_with_code(" Error: Failed to show functions.", ret);
+ return ret;
+#ifdef HAVE_DWARF_SUPPORT
+ case 'L':
+ ret = show_line_range(&params.line_range, params.target,
+ params.nsi, params.uprobes);
+ if (ret < 0)
+ pr_err_with_code(" Error: Failed to show lines.", ret);
+ return ret;
+ case 'V':
+ if (!params.filter)
+ params.filter = strfilter__new(DEFAULT_VAR_FILTER,
+ NULL);
+
+ ret = show_available_vars(params.events, params.nevents,
+ params.filter);
+ if (ret < 0)
+ pr_err_with_code(" Error: Failed to show vars.", ret);
+ return ret;
+#endif
+ case 'd':
+ ret = perf_del_probe_events(params.filter);
+ if (ret < 0) {
+ pr_err_with_code(" Error: Failed to delete events.", ret);
+ return ret;
+ }
+ break;
+ case 'D':
+ case 'a':
+
+ /* Ensure the last given target is used */
+ if (params.target && !params.target_used) {
+ pr_err(" Error: -x/-m must follow the probe definitions.\n");
+ parse_options_usage(probe_usage, options, "m", true);
+ parse_options_usage(NULL, options, "x", true);
+ return -EINVAL;
+ }
+
+ ret = perf_add_probe_events(params.events, params.nevents);
+ if (ret < 0) {
+
+ /*
+ * When perf_add_probe_events() fails it calls
+ * cleanup_perf_probe_events(pevs, npevs), i.e.
+ * cleanup_perf_probe_events(params.events, params.nevents), which
+ * will call clear_perf_probe_event(), so set nevents to zero
+ * to avoid cleanup_params() to call clear_perf_probe_event() again
+ * on the same pevs.
+ */
+ params.nevents = 0;
+ pr_err_with_code(" Error: Failed to add events.", ret);
+ return ret;
+ }
+ break;
+ default:
+ usage_with_options(probe_usage, options);
+ }
+ return 0;
+}
+
+int cmd_probe(int argc, const char **argv)
+{
+ int ret;
+
+ ret = init_params();
+ if (!ret) {
+ ret = __cmd_probe(argc, argv);
+ cleanup_params();
+ }
+
+ return ret < 0 ? ret : 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 13:27:05 +0000