1/*
  2 * builtin-probe.c
  3 *
  4 * Builtin probe command: Set up probe events by C expression
  5 *
  6 * Written by Masami Hiramatsu <mhiramat@redhat.com>
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License as published by
 10 * the Free Software Foundation; either version 2 of the License, or
 11 * (at your option) any later version.
 12 *
 13 * This program is distributed in the hope that it will be useful,
 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16 * GNU General Public License for more details.
 17 *
 18 * You should have received a copy of the GNU General Public License
 19 * along with this program; if not, write to the Free Software
 20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 21 *
 22 */
 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
 33#include "perf.h"
 34#include "builtin.h"
 35#include "util/util.h"
 36#include "util/strlist.h"
 37#include "util/strfilter.h"
 38#include "util/symbol.h"
 39#include "util/debug.h"
 40#include <subcmd/parse-options.h>
 
 41#include "util/probe-finder.h"
 42#include "util/probe-event.h"
 43#include "util/probe-file.h"
 44
 45#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
 46#define DEFAULT_FUNC_FILTER "!_*"
 47#define DEFAULT_LIST_FILTER "*"
 48
 49/* Session management structure */
 50static struct {
 51	int command;	/* Command short_name */
 52	bool list_events;
 
 
 
 
 
 
 53	bool uprobes;
 54	bool quiet;
 55	bool target_used;
 56	int nevents;
 57	struct perf_probe_event events[MAX_PROBES];
 
 58	struct line_range line_range;
 59	char *target;
 
 60	struct strfilter *filter;
 61	struct nsinfo *nsi;
 62} params;
 63
 64/* Parse an event definition. Note that any error must die. */
 65static int parse_probe_event(const char *str)
 66{
 67	struct perf_probe_event *pev = &params.events[params.nevents];
 68	int ret;
 69
 70	pr_debug("probe-definition(%d): %s\n", params.nevents, str);
 71	if (++params.nevents == MAX_PROBES) {
 72		pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
 73		return -1;
 74	}
 75
 76	pev->uprobes = params.uprobes;
 77	if (params.target) {
 78		pev->target = strdup(params.target);
 79		if (!pev->target)
 80			return -ENOMEM;
 81		params.target_used = true;
 82	}
 83
 84	if (params.nsi)
 85		pev->nsi = nsinfo__get(params.nsi);
 86
 87	/* Parse a perf-probe command into event */
 88	ret = parse_perf_probe_command(str, pev);
 89	pr_debug("%d arguments\n", pev->nargs);
 90
 91	return ret;
 92}
 93
 94static int params_add_filter(const char *str)
 95{
 96	const char *err = NULL;
 97	int ret = 0;
 98
 99	pr_debug2("Add filter: %s\n", str);
100	if (!params.filter) {
101		params.filter = strfilter__new(str, &err);
102		if (!params.filter)
103			ret = err ? -EINVAL : -ENOMEM;
104	} else
105		ret = strfilter__or(params.filter, str, &err);
106
107	if (ret == -EINVAL) {
108		pr_err("Filter parse error at %td.\n", err - str + 1);
109		pr_err("Source: \"%s\"\n", str);
110		pr_err("         %*c\n", (int)(err - str + 1), '^');
111	}
112
113	return ret;
114}
115
116static int set_target(const char *ptr)
117{
118	int found = 0;
119	const char *buf;
120
121	/*
122	 * The first argument after options can be an absolute path
123	 * to an executable / library or kernel module.
124	 *
125	 * TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
126	 * short module name.
127	 */
128	if (!params.target && ptr && *ptr == '/') {
129		params.target = strdup(ptr);
130		if (!params.target)
131			return -ENOMEM;
132		params.target_used = false;
133
134		found = 1;
135		buf = ptr + (strlen(ptr) - 3);
136
137		if (strcmp(buf, ".ko"))
138			params.uprobes = true;
139
140	}
141
142	return found;
143}
144
145static int parse_probe_event_argv(int argc, const char **argv)
146{
147	int i, len, ret, found_target;
148	char *buf;
149
150	found_target = set_target(argv[0]);
151	if (found_target < 0)
152		return found_target;
153
154	if (found_target && argc == 1)
155		return 0;
156
157	/* Bind up rest arguments */
158	len = 0;
159	for (i = 0; i < argc; i++) {
160		if (i == 0 && found_target)
161			continue;
162
163		len += strlen(argv[i]) + 1;
164	}
165	buf = zalloc(len + 1);
166	if (buf == NULL)
167		return -ENOMEM;
168	len = 0;
169	for (i = 0; i < argc; i++) {
170		if (i == 0 && found_target)
171			continue;
172
173		len += sprintf(&buf[len], "%s ", argv[i]);
174	}
 
175	ret = parse_probe_event(buf);
176	free(buf);
177	return ret;
178}
179
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
180static int opt_set_target(const struct option *opt, const char *str,
181			int unset __maybe_unused)
182{
183	int ret = -ENOENT;
184	char *tmp;
185
186	if  (str) {
187		if (!strcmp(opt->long_name, "exec"))
188			params.uprobes = true;
 
189		else if (!strcmp(opt->long_name, "module"))
190			params.uprobes = false;
 
191		else
192			return ret;
193
194		/* Expand given path to absolute path, except for modulename */
195		if (params.uprobes || strchr(str, '/')) {
196			tmp = nsinfo__realpath(str, params.nsi);
197			if (!tmp) {
198				pr_warning("Failed to get the absolute path of %s: %m\n", str);
199				return ret;
200			}
201		} else {
202			tmp = strdup(str);
203			if (!tmp)
204				return -ENOMEM;
205		}
206		free(params.target);
207		params.target = tmp;
208		params.target_used = false;
209		ret = 0;
210	}
211
212	return ret;
213}
214
215static int opt_set_target_ns(const struct option *opt __maybe_unused,
216			     const char *str, int unset __maybe_unused)
217{
218	int ret = -ENOENT;
219	pid_t ns_pid;
220	struct nsinfo *nsip;
221
222	if (str) {
223		errno = 0;
224		ns_pid = (pid_t)strtol(str, NULL, 10);
225		if (errno != 0) {
226			ret = -errno;
227			pr_warning("Failed to parse %s as a pid: %s\n", str,
228				   strerror(errno));
229			return ret;
230		}
231		nsip = nsinfo__new(ns_pid);
232		if (nsip && nsip->need_setns)
233			params.nsi = nsinfo__get(nsip);
234		nsinfo__put(nsip);
235
236		ret = 0;
237	}
238
239	return ret;
240}
241
242
243/* Command option callbacks */
244
245#ifdef HAVE_DWARF_SUPPORT
246static int opt_show_lines(const struct option *opt,
247			  const char *str, int unset __maybe_unused)
248{
249	int ret = 0;
250
251	if (!str)
252		return 0;
253
254	if (params.command == 'L') {
255		pr_warning("Warning: more than one --line options are"
256			   " detected. Only the first one is valid.\n");
257		return 0;
258	}
259
260	params.command = opt->short_name;
261	ret = parse_line_range_desc(str, &params.line_range);
262
263	return ret;
264}
265
266static int opt_show_vars(const struct option *opt,
267			 const char *str, int unset __maybe_unused)
268{
269	struct perf_probe_event *pev = &params.events[params.nevents];
270	int ret;
271
272	if (!str)
273		return 0;
274
275	ret = parse_probe_event(str);
276	if (!ret && pev->nargs != 0) {
277		pr_err("  Error: '--vars' doesn't accept arguments.\n");
278		return -EINVAL;
279	}
280	params.command = opt->short_name;
281
282	return ret;
283}
284#else
285# define opt_show_lines NULL
286# define opt_show_vars NULL
287#endif
288static int opt_add_probe_event(const struct option *opt,
289			      const char *str, int unset __maybe_unused)
290{
291	if (str) {
292		params.command = opt->short_name;
293		return parse_probe_event(str);
294	}
295
296	return 0;
297}
298
299static int opt_set_filter_with_command(const struct option *opt,
300				       const char *str, int unset)
301{
302	if (!unset)
303		params.command = opt->short_name;
304
305	if (str)
306		return params_add_filter(str);
307
308	return 0;
309}
310
311static int opt_set_filter(const struct option *opt __maybe_unused,
312			  const char *str, int unset __maybe_unused)
313{
314	if (str)
315		return params_add_filter(str);
 
 
 
 
 
 
 
 
 
 
 
 
316
317	return 0;
318}
319
320static int init_params(void)
321{
322	return line_range__init(&params.line_range);
323}
324
325static void cleanup_params(void)
326{
327	int i;
328
329	for (i = 0; i < params.nevents; i++)
330		clear_perf_probe_event(params.events + i);
 
 
331	line_range__clear(&params.line_range);
332	free(params.target);
333	strfilter__delete(params.filter);
334	nsinfo__put(params.nsi);
335	memset(&params, 0, sizeof(params));
336}
337
338static void pr_err_with_code(const char *msg, int err)
339{
340	char sbuf[STRERR_BUFSIZE];
341
342	pr_err("%s", msg);
343	pr_debug(" Reason: %s (Code: %d)",
344		 str_error_r(-err, sbuf, sizeof(sbuf)), err);
345	pr_err("\n");
346}
347
348static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
349{
350	int ret;
351	int i, k;
352	const char *event = NULL, *group = NULL;
353
354	ret = init_probe_symbol_maps(pevs->uprobes);
355	if (ret < 0)
356		return ret;
357
358	ret = convert_perf_probe_events(pevs, npevs);
359	if (ret < 0)
360		goto out_cleanup;
361
362	if (params.command == 'D') {	/* it shows definition */
363		ret = show_probe_trace_events(pevs, npevs);
364		goto out_cleanup;
365	}
366
367	ret = apply_perf_probe_events(pevs, npevs);
368	if (ret < 0)
369		goto out_cleanup;
370
371	for (i = k = 0; i < npevs; i++)
372		k += pevs[i].ntevs;
373
374	pr_info("Added new event%s\n", (k > 1) ? "s:" : ":");
375	for (i = 0; i < npevs; i++) {
376		struct perf_probe_event *pev = &pevs[i];
377
378		for (k = 0; k < pev->ntevs; k++) {
379			struct probe_trace_event *tev = &pev->tevs[k];
380
381			/* We use tev's name for showing new events */
382			show_perf_probe_event(tev->group, tev->event, pev,
383					      tev->point.module, false);
384
385			/* Save the last valid name */
386			event = tev->event;
387			group = tev->group;
388		}
389	}
390
391	/* Note that it is possible to skip all events because of blacklist */
392	if (event) {
393		/* Show how to use the event. */
394		pr_info("\nYou can now use it in all perf tools, such as:\n\n");
395		pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
396	}
397
398out_cleanup:
399	cleanup_perf_probe_events(pevs, npevs);
400	exit_probe_symbol_maps();
401	return ret;
402}
403
404static int del_perf_probe_caches(struct strfilter *filter)
405{
406	struct probe_cache *cache;
407	struct strlist *bidlist;
408	struct str_node *nd;
409	int ret;
410
411	bidlist = build_id_cache__list_all(false);
412	if (!bidlist) {
413		ret = -errno;
414		pr_debug("Failed to get buildids: %d\n", ret);
415		return ret ?: -ENOMEM;
416	}
417
418	strlist__for_each_entry(nd, bidlist) {
419		cache = probe_cache__new(nd->s, NULL);
420		if (!cache)
421			continue;
422		if (probe_cache__filter_purge(cache, filter) < 0 ||
423		    probe_cache__commit(cache) < 0)
424			pr_warning("Failed to remove entries for %s\n", nd->s);
425		probe_cache__delete(cache);
426	}
427	return 0;
428}
429
430static int perf_del_probe_events(struct strfilter *filter)
431{
432	int ret, ret2, ufd = -1, kfd = -1;
433	char *str = strfilter__string(filter);
434	struct strlist *klist = NULL, *ulist = NULL;
435	struct str_node *ent;
436
437	if (!str)
438		return -EINVAL;
439
440	pr_debug("Delete filter: \'%s\'\n", str);
441
442	if (probe_conf.cache)
443		return del_perf_probe_caches(filter);
444
445	/* Get current event names */
446	ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
447	if (ret < 0)
448		goto out;
449
450	klist = strlist__new(NULL, NULL);
451	ulist = strlist__new(NULL, NULL);
452	if (!klist || !ulist) {
453		ret = -ENOMEM;
454		goto out;
455	}
456
457	ret = probe_file__get_events(kfd, filter, klist);
458	if (ret == 0) {
459		strlist__for_each_entry(ent, klist)
460			pr_info("Removed event: %s\n", ent->s);
461
462		ret = probe_file__del_strlist(kfd, klist);
463		if (ret < 0)
464			goto error;
465	}
466
467	ret2 = probe_file__get_events(ufd, filter, ulist);
468	if (ret2 == 0) {
469		strlist__for_each_entry(ent, ulist)
470			pr_info("Removed event: %s\n", ent->s);
471
472		ret2 = probe_file__del_strlist(ufd, ulist);
473		if (ret2 < 0)
474			goto error;
475	}
476
477	if (ret == -ENOENT && ret2 == -ENOENT)
478		pr_warning("\"%s\" does not hit any event.\n", str);
479	else
480		ret = 0;
481
482error:
483	if (kfd >= 0)
484		close(kfd);
485	if (ufd >= 0)
486		close(ufd);
487out:
488	strlist__delete(klist);
489	strlist__delete(ulist);
490	free(str);
491
492	return ret;
493}
494
495#ifdef HAVE_DWARF_SUPPORT
496#define PROBEDEF_STR	\
497	"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT [[NAME=]ARG ...]"
498#else
499#define PROBEDEF_STR	"[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]"
500#endif
501
502
503static int
504__cmd_probe(int argc, const char **argv)
505{
506	const char * const probe_usage[] = {
507		"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
508		"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
509		"perf probe [<options>] --del '[GROUP:]EVENT' ...",
510		"perf probe --list [GROUP:]EVENT ...",
511#ifdef HAVE_DWARF_SUPPORT
512		"perf probe [<options>] --line 'LINEDESC'",
513		"perf probe [<options>] --vars 'PROBEPOINT'",
514#endif
515		"perf probe [<options>] --funcs",
516		NULL
517	};
518	struct option options[] = {
519	OPT_INCR('v', "verbose", &verbose,
520		    "be more verbose (show parsed arguments, etc)"),
521	OPT_BOOLEAN('q', "quiet", &params.quiet,
522		    "be quiet (do not show any messages)"),
523	OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
524			     "list up probe events",
525			     opt_set_filter_with_command, DEFAULT_LIST_FILTER),
526	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
527		     opt_set_filter_with_command),
528	OPT_CALLBACK('a', "add", NULL, PROBEDEF_STR,
 
 
 
 
 
 
529		"probe point definition, where\n"
530		"\t\tGROUP:\tGroup name (optional)\n"
531		"\t\tEVENT:\tEvent name\n"
532		"\t\tFUNC:\tFunction name\n"
533		"\t\tOFF:\tOffset from function entry (in byte)\n"
534		"\t\t%return:\tPut the probe at function return\n"
535#ifdef HAVE_DWARF_SUPPORT
536		"\t\tSRC:\tSource code path\n"
537		"\t\tRL:\tRelative line number from function entry.\n"
538		"\t\tAL:\tAbsolute line number in file.\n"
539		"\t\tPT:\tLazy expression of line code.\n"
540		"\t\tARG:\tProbe argument (local variable name or\n"
541		"\t\t\tkprobe-tracer argument format.)\n",
542#else
543		"\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
544#endif
545		opt_add_probe_event),
546	OPT_CALLBACK('D', "definition", NULL, PROBEDEF_STR,
547		"Show trace event definition of given traceevent for k/uprobe_events.",
548		opt_add_probe_event),
549	OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
550		    " with existing name"),
 
551	OPT_CALLBACK('L', "line", NULL,
552		     "FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
553		     "Show source code lines.", opt_show_lines),
554	OPT_CALLBACK('V', "vars", NULL,
555		     "FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
556		     "Show accessible variables on PROBEDEF", opt_show_vars),
557	OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars,
558		    "Show external variables too (with --vars only)"),
559	OPT_BOOLEAN('\0', "range", &probe_conf.show_location_range,
560		"Show variables location range in scope (with --vars only)"),
561	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
562		   "file", "vmlinux pathname"),
563	OPT_STRING('s', "source", &symbol_conf.source_prefix,
564		   "directory", "path to kernel source"),
565	OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines,
566		"Don't search inlined functions"),
 
 
567	OPT__DRY_RUN(&probe_event_dry_run),
568	OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes,
569		 "Set how many probe points can be found for a probe."),
570	OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
571			     "Show potential probe-able functions.",
572			     opt_set_filter_with_command, DEFAULT_FUNC_FILTER),
573	OPT_CALLBACK('\0', "filter", NULL,
574		     "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
575		     "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
576		     "\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
577		     opt_set_filter),
578	OPT_CALLBACK('x', "exec", NULL, "executable|path",
579			"target executable name or path", opt_set_target),
580	OPT_CALLBACK('m', "module", NULL, "modname|path",
581		"target module name (for online) or path (for offline)",
582		opt_set_target),
583	OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
584		    "Enable symbol demangling"),
585	OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
586		    "Enable kernel symbol demangling"),
587	OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),
588	OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
589		   "Look for files with symbols relative to this directory"),
590	OPT_CALLBACK(0, "target-ns", NULL, "pid",
591		     "target pid for namespace contexts", opt_set_target_ns),
592	OPT_END()
593	};
594	int ret;
595
596	set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
597	set_option_flag(options, 'd', "del", PARSE_OPT_EXCLUSIVE);
598	set_option_flag(options, 'D', "definition", PARSE_OPT_EXCLUSIVE);
599	set_option_flag(options, 'l', "list", PARSE_OPT_EXCLUSIVE);
600#ifdef HAVE_DWARF_SUPPORT
601	set_option_flag(options, 'L', "line", PARSE_OPT_EXCLUSIVE);
602	set_option_flag(options, 'V', "vars", PARSE_OPT_EXCLUSIVE);
603#else
604# define set_nobuild(s, l, c) set_option_nobuild(options, s, l, "NO_DWARF=1", c)
605	set_nobuild('L', "line", false);
606	set_nobuild('V', "vars", false);
607	set_nobuild('\0', "externs", false);
608	set_nobuild('\0', "range", false);
609	set_nobuild('k', "vmlinux", true);
610	set_nobuild('s', "source", true);
611	set_nobuild('\0', "no-inlines", true);
612# undef set_nobuild
613#endif
614	set_option_flag(options, 'F', "funcs", PARSE_OPT_EXCLUSIVE);
615
616	argc = parse_options(argc, argv, options, probe_usage,
617			     PARSE_OPT_STOP_AT_NON_OPTION);
618	if (argc > 0) {
619		if (strcmp(argv[0], "-") == 0) {
620			usage_with_options_msg(probe_usage, options,
621				"'-' is not supported.\n");
622		}
623		if (params.command && params.command != 'a') {
624			usage_with_options_msg(probe_usage, options,
625				"another command except --add is set.\n");
626		}
627		ret = parse_probe_event_argv(argc, argv);
628		if (ret < 0) {
629			pr_err_with_code("  Error: Command Parse Error.", ret);
630			return ret;
631		}
632		params.command = 'a';
633	}
634
635	if (params.quiet) {
636		if (verbose != 0) {
637			pr_err("  Error: -v and -q are exclusive.\n");
638			return -EINVAL;
639		}
640		verbose = -1;
641	}
642
643	if (probe_conf.max_probes == 0)
644		probe_conf.max_probes = MAX_PROBES;
 
645
646	/*
647	 * Only consider the user's kernel image path if given.
648	 */
649	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
650
651	/*
652	 * Except for --list, --del and --add, other command doesn't depend
653	 * nor change running kernel. So if user gives offline vmlinux,
654	 * ignore its buildid.
655	 */
656	if (!strchr("lda", params.command) && symbol_conf.vmlinux_name)
657		symbol_conf.ignore_vmlinux_buildid = true;
658
659	switch (params.command) {
660	case 'l':
 
 
 
 
 
 
 
661		if (params.uprobes) {
662			pr_err("  Error: Don't use --list with --exec.\n");
663			parse_options_usage(probe_usage, options, "l", true);
664			parse_options_usage(NULL, options, "x", true);
665			return -EINVAL;
666		}
667		ret = show_perf_probe_events(params.filter);
668		if (ret < 0)
669			pr_err_with_code("  Error: Failed to show event list.", ret);
 
670		return ret;
671	case 'F':
672		ret = show_available_funcs(params.target, params.nsi,
673					   params.filter, params.uprobes);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
674		if (ret < 0)
675			pr_err_with_code("  Error: Failed to show functions.", ret);
 
676		return ret;
 
 
677#ifdef HAVE_DWARF_SUPPORT
678	case 'L':
679		ret = show_line_range(&params.line_range, params.target,
680				      params.nsi, params.uprobes);
 
 
 
 
 
 
 
 
 
681		if (ret < 0)
682			pr_err_with_code("  Error: Failed to show lines.", ret);
683		return ret;
684	case 'V':
 
 
 
 
 
 
685		if (!params.filter)
686			params.filter = strfilter__new(DEFAULT_VAR_FILTER,
687						       NULL);
688
689		ret = show_available_vars(params.events, params.nevents,
690					  params.filter);
 
 
 
 
 
691		if (ret < 0)
692			pr_err_with_code("  Error: Failed to show vars.", ret);
693		return ret;
 
694#endif
695	case 'd':
696		ret = perf_del_probe_events(params.filter);
 
697		if (ret < 0) {
698			pr_err_with_code("  Error: Failed to delete events.", ret);
699			return ret;
700		}
701		break;
702	case 'D':
703	case 'a':
704
705		/* Ensure the last given target is used */
706		if (params.target && !params.target_used) {
707			pr_err("  Error: -x/-m must follow the probe definitions.\n");
708			parse_options_usage(probe_usage, options, "m", true);
709			parse_options_usage(NULL, options, "x", true);
710			return -EINVAL;
711		}
712
713		ret = perf_add_probe_events(params.events, params.nevents);
 
 
 
 
714		if (ret < 0) {
715			pr_err_with_code("  Error: Failed to add events.", ret);
716			return ret;
717		}
718		break;
719	default:
720		usage_with_options(probe_usage, options);
721	}
722	return 0;
723}
724
725int cmd_probe(int argc, const char **argv)
726{
727	int ret;
728
729	ret = init_params();
730	if (!ret) {
731		ret = __cmd_probe(argc, argv);
732		cleanup_params();
733	}
734
735	return ret < 0 ? ret : 0;
736}