[net-next-2.6.git] / tools / perf / builtin-probe.c

/*
 * 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.
 *
 */
#define _GNU_SOURCE
#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>

#undef _GNU_SOURCE
#include "perf.h"
#include "builtin.h"
#include "util/util.h"
#include "util/strlist.h"
#include "util/symbol.h"
#include "util/debug.h"
#include "util/debugfs.h"
#include "util/parse-options.h"
#include "util/probe-finder.h"
#include "util/probe-event.h"

#define MAX_PATH_LEN 256

/* Session management structure */
static struct {
	bool list_events;
	bool force_add;
	bool show_lines;
	bool show_vars;
	bool show_ext_vars;
	bool mod_events;
	int nevents;
	struct perf_probe_event events[MAX_PROBES];
	struct strlist *dellist;
	struct line_range line_range;
	const char *target_module;
	int max_probe_points;
} 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;
	}

	/* 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 parse_probe_event_argv(int argc, const char **argv)
{
	int i, len, ret;
	char *buf;

	/* Bind up rest arguments */
	len = 0;
	for (i = 0; i < argc; i++)
		len += strlen(argv[i]) + 1;
	buf = zalloc(len + 1);
	if (buf == NULL)
		return -ENOMEM;
	len = 0;
	for (i = 0; i < argc; i++)
		len += sprintf(&buf[len], "%s ", argv[i]);
	params.mod_events = true;
	ret = parse_probe_event(buf);
	free(buf);
	return ret;
}

static int opt_add_probe_event(const struct option *opt __used,
			      const char *str, int unset __used)
{
	if (str) {
		params.mod_events = true;
		return parse_probe_event(str);
	} else
		return 0;
}

static int opt_del_probe_event(const struct option *opt __used,
			       const char *str, int unset __used)
{
	if (str) {
		params.mod_events = true;
		if (!params.dellist)
			params.dellist = strlist__new(true, NULL);
		strlist__add(params.dellist, str);
	}
	return 0;
}

#ifdef DWARF_SUPPORT
static int opt_show_lines(const struct option *opt __used,
			  const char *str, int unset __used)
{
	int ret = 0;

	if (str)
		ret = parse_line_range_desc(str, &params.line_range);
	INIT_LIST_HEAD(&params.line_range.line_list);
	params.show_lines = true;

	return ret;
}

static int opt_show_vars(const struct option *opt __used,
			 const char *str, int unset __used)
{
	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.show_vars = true;

	return ret;
}
#endif

static 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",
#ifdef DWARF_SUPPORT
	"perf probe [<options>] --line 'LINEDESC'",
	"perf probe [<options>] --vars 'PROBEPOINT'",
#endif
	NULL
};

static const struct option options[] = {
	OPT_INCR('v', "verbose", &verbose,
		    "be more verbose (show parsed arguments, etc)"),
	OPT_BOOLEAN('l', "list", &params.list_events,
		    "list up current probe events"),
	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
		opt_del_probe_event),
	OPT_CALLBACK('a', "add", NULL,
#ifdef DWARF_SUPPORT
		"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
		" [[NAME=]ARG ...]",
#else
		"[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]",
#endif
		"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 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_BOOLEAN('f', "force", &params.force_add, "forcibly add events"
		    " with existing name"),
#ifdef DWARF_SUPPORT
	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", &params.show_ext_vars,
		    "Show external variables too (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_STRING('m', "module", &params.target_module,
		   "modname", "target module name"),
#endif
	OPT__DRY_RUN(&probe_event_dry_run),
	OPT_INTEGER('\0', "max-probes", &params.max_probe_points,
		 "Set how many probe points can be found for a probe."),
	OPT_END()
};

int cmd_probe(int argc, const char **argv, const char *prefix __used)
{
	int ret;

	argc = parse_options(argc, argv, options, probe_usage,
			     PARSE_OPT_STOP_AT_NON_OPTION);
	if (argc > 0) {
		if (strcmp(argv[0], "-") == 0) {
			pr_warning("  Error: '-' is not supported.\n");
			usage_with_options(probe_usage, options);
		}
		ret = parse_probe_event_argv(argc, argv);
		if (ret < 0) {
			pr_err("  Error: Parse Error.  (%d)\n", ret);
			return ret;
		}
	}

	if (params.max_probe_points == 0)
		params.max_probe_points = MAX_PROBES;

	if ((!params.nevents && !params.dellist && !params.list_events &&
	     !params.show_lines))
		usage_with_options(probe_usage, options);

	if (params.list_events) {
		if (params.mod_events) {
			pr_err("  Error: Don't use --list with --add/--del.\n");
			usage_with_options(probe_usage, options);
		}
		if (params.show_lines) {
			pr_err("  Error: Don't use --list with --line.\n");
			usage_with_options(probe_usage, options);
		}
		if (params.show_vars) {
			pr_err(" Error: Don't use --list with --vars.\n");
			usage_with_options(probe_usage, options);
		}
		ret = show_perf_probe_events();
		if (ret < 0)
			pr_err("  Error: Failed to show event list. (%d)\n",
			       ret);
		return ret;
	}

#ifdef DWARF_SUPPORT
	if (params.show_lines) {
		if (params.mod_events) {
			pr_err("  Error: Don't use --line with"
			       " --add/--del.\n");
			usage_with_options(probe_usage, options);
		}
		if (params.show_vars) {
			pr_err(" Error: Don't use --line with --vars.\n");
			usage_with_options(probe_usage, options);
		}

		ret = show_line_range(&params.line_range, params.target_module);
		if (ret < 0)
			pr_err("  Error: Failed to show lines. (%d)\n", ret);
		return ret;
	}
	if (params.show_vars) {
		if (params.mod_events) {
			pr_err("  Error: Don't use --vars with"
			       " --add/--del.\n");
			usage_with_options(probe_usage, options);
		}
		ret = show_available_vars(params.events, params.nevents,
					  params.max_probe_points,
					  params.target_module,
					  params.show_ext_vars);
		if (ret < 0)
			pr_err("  Error: Failed to show vars. (%d)\n", ret);
		return ret;
	}
#endif

	if (params.dellist) {
		ret = del_perf_probe_events(params.dellist);
		strlist__delete(params.dellist);
		if (ret < 0) {
			pr_err("  Error: Failed to delete events. (%d)\n", ret);
			return ret;
		}
	}

	if (params.nevents) {
		ret = add_perf_probe_events(params.events, params.nevents,
					    params.max_probe_points,
					    params.target_module,
					    params.force_add);
		if (ret < 0) {
			pr_err("  Error: Failed to add events. (%d)\n", ret);
			return ret;
		}
	}
	return 0;
}
Commit	Line	Data
4ea42b18 MH	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	#define _GNU_SOURCE
	24	#include <sys/utsname.h>
	25	#include <sys/types.h>
	26	#include <sys/stat.h>
	27	#include <fcntl.h>
	28	#include <errno.h>
	29	#include <stdio.h>
	30	#include <unistd.h>
	31	#include <stdlib.h>
	32	#include <string.h>
	33
	34	#undef _GNU_SOURCE
	35	#include "perf.h"
	36	#include "builtin.h"
	37	#include "util/util.h"
fa28244d	38	#include "util/strlist.h"
e0faa8d3	39	#include "util/symbol.h"
89c69c0e	40	#include "util/debug.h"
96c96612	41	#include "util/debugfs.h"
4ea42b18	42	#include "util/parse-options.h"
4ea42b18	43	#include "util/probe-finder.h"
50656eec	44	#include "util/probe-event.h"
4ea42b18	45
4ea42b18	46	#define MAX_PATH_LEN 256
4ea42b18 MH	47
	48	/* Session management structure */
	49	static struct {
fac13fd5	50	bool list_events;
d761b08b	51	bool force_add;
631c9def	52	bool show_lines;
cf6eb489	53	bool show_vars;
fb8c5a56	54	bool show_ext_vars;
cf6eb489	55	bool mod_events;
4235b045 MH	56	int nevents;
4235b045 MH	57	struct perf_probe_event events[MAX_PROBES];
fa28244d	58	struct strlist *dellist;
631c9def	59	struct line_range line_range;
469b9b88	60	const char *target_module;
ef4a3565	61	int max_probe_points;
12a1fadb	62	} params;
4ea42b18	63
253977b0	64	/* Parse an event definition. Note that any error must die. */
146a1439	65	static int parse_probe_event(const char *str)
4ea42b18	66	{
4235b045	67	struct perf_probe_event *pev = &params.events[params.nevents];
146a1439	68	int ret;
4ea42b18	69
4235b045	70	pr_debug("probe-definition(%d): %s\n", params.nevents, str);
8a7ddad8 ACM	71	if (++params.nevents == MAX_PROBES) {
	72	pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
	73	return -1;
	74	}
4ea42b18	75
4235b045	76	/* Parse a perf-probe command into event */
146a1439	77	ret = parse_perf_probe_command(str, pev);
4235b045	78	pr_debug("%d arguments\n", pev->nargs);
146a1439 MH	79
146a1439 MH	80	return ret;
46ab4926 MH	81	}
46ab4926 MH	82
146a1439	83	static int parse_probe_event_argv(int argc, const char **argv)
d1bde3f7	84	{
146a1439	85	int i, len, ret;
d1bde3f7 MH	86	char *buf;
	87
	88	/* Bind up rest arguments */
	89	len = 0;
	90	for (i = 0; i < argc; i++)
	91	len += strlen(argv[i]) + 1;
8a7ddad8 ACM	92	buf = zalloc(len + 1);
	93	if (buf == NULL)
	94	return -ENOMEM;
d1bde3f7 MH	95	len = 0;
	96	for (i = 0; i < argc; i++)
	97	len += sprintf(&buf[len], "%s ", argv[i]);
cf6eb489	98	params.mod_events = true;
146a1439	99	ret = parse_probe_event(buf);
d1bde3f7	100	free(buf);
146a1439	101	return ret;
d1bde3f7 MH	102	}
d1bde3f7 MH	103
253977b0	104	static int opt_add_probe_event(const struct option *opt __used,
46ab4926 MH	105	const char *str, int unset __used)
46ab4926 MH	106	{
cf6eb489 MH	107	if (str) {
cf6eb489 MH	108	params.mod_events = true;
146a1439	109	return parse_probe_event(str);
cf6eb489	110	} else
146a1439	111	return 0;
4ea42b18 MH	112	}
4ea42b18 MH	113
fa28244d MH	114	static int opt_del_probe_event(const struct option *opt __used,
	115	const char *str, int unset __used)
	116	{
	117	if (str) {
cf6eb489	118	params.mod_events = true;
12a1fadb MH	119	if (!params.dellist)
	120	params.dellist = strlist__new(true, NULL);
	121	strlist__add(params.dellist, str);
fa28244d MH	122	}
	123	return 0;
	124	}
	125
4b4da7f7	126	#ifdef DWARF_SUPPORT
0eda7385 HM	127	static int opt_show_lines(const struct option *opt __used,
	128	const char *str, int unset __used)
	129	{
146a1439 MH	130	int ret = 0;
146a1439 MH	131
0eda7385	132	if (str)
146a1439	133	ret = parse_line_range_desc(str, &params.line_range);
12a1fadb MH	134	INIT_LIST_HEAD(&params.line_range.line_list);
12a1fadb MH	135	params.show_lines = true;
146a1439 MH	136
146a1439 MH	137	return ret;
0eda7385	138	}
cf6eb489 MH	139
	140	static int opt_show_vars(const struct option *opt __used,
	141	const char *str, int unset __used)
	142	{
	143	struct perf_probe_event *pev = &params.events[params.nevents];
	144	int ret;
	145
	146	if (!str)
	147	return 0;
	148
	149	ret = parse_probe_event(str);
	150	if (!ret && pev->nargs != 0) {
	151	pr_err(" Error: '--vars' doesn't accept arguments.\n");
	152	return -EINVAL;
	153	}
	154	params.show_vars = true;
	155
	156	return ret;
	157	}
23e8ec0d	158	#endif
4ea42b18 MH	159
4ea42b18 MH	160	static const char * const probe_usage[] = {
46ab4926 MH	161	"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
46ab4926 MH	162	"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
fa28244d	163	"perf probe [<options>] --del '[GROUP:]EVENT' ...",
4de189fe	164	"perf probe --list",
4b4da7f7	165	#ifdef DWARF_SUPPORT
469b9b88 MH	166	"perf probe [<options>] --line 'LINEDESC'",
469b9b88 MH	167	"perf probe [<options>] --vars 'PROBEPOINT'",
f3ab481c	168	#endif
4ea42b18 MH	169	NULL
	170	};
	171
	172	static const struct option options[] = {
c0555642	173	OPT_INCR('v', "verbose", &verbose,
89c69c0e	174	"be more verbose (show parsed arguments, etc)"),
12a1fadb	175	OPT_BOOLEAN('l', "list", &params.list_events,
fac13fd5	176	"list up current probe events"),
fa28244d MH	177	OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
fa28244d MH	178	opt_del_probe_event),
46ab4926	179	OPT_CALLBACK('a', "add", NULL,
4b4da7f7	180	#ifdef DWARF_SUPPORT
32cb0dd5	181	"[EVENT=]FUNC[@SRC][+OFF\|%return\|:RL\|;PT]\|SRC:AL\|SRC;PT"
48481938	182	" [[NAME=]ARG ...]",
4b4da7f7	183	#else
48481938	184	"[EVENT=]FUNC[+OFF\|%return] [[NAME=]ARG ...]",
23e8ec0d	185	#endif
4ea42b18	186	"probe point definition, where\n"
af663d75 MH	187	"\t\tGROUP:\tGroup name (optional)\n"
af663d75 MH	188	"\t\tEVENT:\tEvent name\n"
4ea42b18	189	"\t\tFUNC:\tFunction name\n"
2a9c8c36	190	"\t\tOFF:\tOffset from function entry (in byte)\n"
253977b0	191	"\t\t%return:\tPut the probe at function return\n"
4b4da7f7	192	#ifdef DWARF_SUPPORT
4ea42b18	193	"\t\tSRC:\tSource code path\n"
2a9c8c36 MH	194	"\t\tRL:\tRelative line number from function entry.\n"
	195	"\t\tAL:\tAbsolute line number in file.\n"
	196	"\t\tPT:\tLazy expression of line code.\n"
4ea42b18	197	"\t\tARG:\tProbe argument (local variable name or\n"
50656eec	198	"\t\t\tkprobe-tracer argument format.)\n",
4b4da7f7 MH	199	#else
	200	"\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
	201	#endif
253977b0	202	opt_add_probe_event),
12a1fadb	203	OPT_BOOLEAN('f', "force", &params.force_add, "forcibly add events"
d761b08b	204	" with existing name"),
4b4da7f7	205	#ifdef DWARF_SUPPORT
631c9def	206	OPT_CALLBACK('L', "line", NULL,
085ea739	207	"FUNC[:RLN[+NUM\|-RLN2]]\|SRC:ALN[+NUM\|-ALN2]",
631c9def	208	"Show source code lines.", opt_show_lines),
cf6eb489 MH	209	OPT_CALLBACK('V', "vars", NULL,
	210	"FUNC[@SRC][+OFF\|%return\|:RL\|;PT]\|SRC:AL\|SRC;PT",
	211	"Show accessible variables on PROBEDEF", opt_show_vars),
fb8c5a56 MH	212	OPT_BOOLEAN('\0', "externs", &params.show_ext_vars,
fb8c5a56 MH	213	"Show external variables too (with --vars only)"),
4b4da7f7 MH	214	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
4b4da7f7 MH	215	"file", "vmlinux pathname"),
9ed7e1b8 CD	216	OPT_STRING('s', "source", &symbol_conf.source_prefix,
9ed7e1b8 CD	217	"directory", "path to kernel source"),
469b9b88 MH	218	OPT_STRING('m', "module", &params.target_module,
469b9b88 MH	219	"modname", "target module name"),
631c9def	220	#endif
f4d7da49	221	OPT__DRY_RUN(&probe_event_dry_run),
ef4a3565 MH	222	OPT_INTEGER('\0', "max-probes", &params.max_probe_points,
ef4a3565 MH	223	"Set how many probe points can be found for a probe."),
4ea42b18 MH	224	OPT_END()
	225	};
	226
4ea42b18 MH	227	int cmd_probe(int argc, const char *argv, const char prefix __used)
4ea42b18 MH	228	{
146a1439 MH	229	int ret;
146a1439 MH	230
4ea42b18	231	argc = parse_options(argc, argv, options, probe_usage,
46ab4926	232	PARSE_OPT_STOP_AT_NON_OPTION);
ce11a603 MH	233	if (argc > 0) {
	234	if (strcmp(argv[0], "-") == 0) {
	235	pr_warning(" Error: '-' is not supported.\n");
	236	usage_with_options(probe_usage, options);
	237	}
146a1439 MH	238	ret = parse_probe_event_argv(argc, argv);
	239	if (ret < 0) {
	240	pr_err(" Error: Parse Error. (%d)\n", ret);
	241	return ret;
	242	}
ce11a603	243	}
46ab4926	244
ef4a3565 MH	245	if (params.max_probe_points == 0)
	246	params.max_probe_points = MAX_PROBES;
	247
4235b045	248	if ((!params.nevents && !params.dellist && !params.list_events &&
12a1fadb	249	!params.show_lines))
4ea42b18 MH	250	usage_with_options(probe_usage, options);
4ea42b18 MH	251
12a1fadb	252	if (params.list_events) {
cf6eb489	253	if (params.mod_events) {
146a1439	254	pr_err(" Error: Don't use --list with --add/--del.\n");
fa28244d MH	255	usage_with_options(probe_usage, options);
fa28244d MH	256	}
12a1fadb	257	if (params.show_lines) {
146a1439	258	pr_err(" Error: Don't use --list with --line.\n");
631c9def MH	259	usage_with_options(probe_usage, options);
631c9def MH	260	}
cf6eb489 MH	261	if (params.show_vars) {
	262	pr_err(" Error: Don't use --list with --vars.\n");
	263	usage_with_options(probe_usage, options);
	264	}
146a1439 MH	265	ret = show_perf_probe_events();
	266	if (ret < 0)
	267	pr_err(" Error: Failed to show event list. (%d)\n",
	268	ret);
	269	return ret;
4de189fe MH	270	}
4de189fe MH	271
4b4da7f7	272	#ifdef DWARF_SUPPORT
12a1fadb	273	if (params.show_lines) {
cf6eb489 MH	274	if (params.mod_events) {
	275	pr_err(" Error: Don't use --line with"
	276	" --add/--del.\n");
	277	usage_with_options(probe_usage, options);
	278	}
	279	if (params.show_vars) {
	280	pr_err(" Error: Don't use --line with --vars.\n");
631c9def MH	281	usage_with_options(probe_usage, options);
631c9def MH	282	}
e0faa8d3	283
469b9b88	284	ret = show_line_range(&params.line_range, params.target_module);
146a1439 MH	285	if (ret < 0)
	286	pr_err(" Error: Failed to show lines. (%d)\n", ret);
	287	return ret;
631c9def	288	}
cf6eb489 MH	289	if (params.show_vars) {
	290	if (params.mod_events) {
	291	pr_err(" Error: Don't use --vars with"
	292	" --add/--del.\n");
	293	usage_with_options(probe_usage, options);
	294	}
	295	ret = show_available_vars(params.events, params.nevents,
fb8c5a56	296	params.max_probe_points,
469b9b88	297	params.target_module,
fb8c5a56	298	params.show_ext_vars);
cf6eb489 MH	299	if (ret < 0)
	300	pr_err(" Error: Failed to show vars. (%d)\n", ret);
	301	return ret;
	302	}
631c9def MH	303	#endif
631c9def MH	304
12a1fadb	305	if (params.dellist) {
146a1439	306	ret = del_perf_probe_events(params.dellist);
12a1fadb	307	strlist__delete(params.dellist);
146a1439 MH	308	if (ret < 0) {
	309	pr_err(" Error: Failed to delete events. (%d)\n", ret);
	310	return ret;
	311	}
fa28244d MH	312	}
fa28244d MH	313
146a1439 MH	314	if (params.nevents) {
146a1439 MH	315	ret = add_perf_probe_events(params.events, params.nevents,
c82ec0a2	316	params.max_probe_points,
469b9b88	317	params.target_module,
c82ec0a2	318	params.force_add);
146a1439 MH	319	if (ret < 0) {
	320	pr_err(" Error: Failed to add events. (%d)\n", ret);
	321	return ret;
	322	}
	323	}
4ea42b18 MH	324	return 0;
4ea42b18 MH	325	}