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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 "util/debugfs.h"
41#include "util/parse-options.h"
42#include "util/probe-finder.h"
43#include "util/probe-event.h"
44
45#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
46#define DEFAULT_FUNC_FILTER "!_*"
47
48/* Session management structure */
49static struct {
50 bool list_events;
51 bool force_add;
52 bool show_lines;
53 bool show_vars;
54 bool show_ext_vars;
55 bool show_funcs;
56 bool mod_events;
57 bool uprobes;
58 int nevents;
59 struct perf_probe_event events[MAX_PROBES];
60 struct strlist *dellist;
61 struct line_range line_range;
62 const char *target;
63 int max_probe_points;
64 struct strfilter *filter;
65} params;
66
67/* Parse an event definition. Note that any error must die. */
68static int parse_probe_event(const char *str)
69{
70 struct perf_probe_event *pev = ¶ms.events[params.nevents];
71 int ret;
72
73 pr_debug("probe-definition(%d): %s\n", params.nevents, str);
74 if (++params.nevents == MAX_PROBES) {
75 pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
76 return -1;
77 }
78
79 pev->uprobes = params.uprobes;
80
81 /* Parse a perf-probe command into event */
82 ret = parse_perf_probe_command(str, pev);
83 pr_debug("%d arguments\n", pev->nargs);
84
85 return ret;
86}
87
88static int set_target(const char *ptr)
89{
90 int found = 0;
91 const char *buf;
92
93 /*
94 * The first argument after options can be an absolute path
95 * to an executable / library or kernel module.
96 *
97 * TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
98 * short module name.
99 */
100 if (!params.target && ptr && *ptr == '/') {
101 params.target = ptr;
102 found = 1;
103 buf = ptr + (strlen(ptr) - 3);
104
105 if (strcmp(buf, ".ko"))
106 params.uprobes = true;
107
108 }
109
110 return found;
111}
112
113static int parse_probe_event_argv(int argc, const char **argv)
114{
115 int i, len, ret, found_target;
116 char *buf;
117
118 found_target = set_target(argv[0]);
119 if (found_target && argc == 1)
120 return 0;
121
122 /* Bind up rest arguments */
123 len = 0;
124 for (i = 0; i < argc; i++) {
125 if (i == 0 && found_target)
126 continue;
127
128 len += strlen(argv[i]) + 1;
129 }
130 buf = zalloc(len + 1);
131 if (buf == NULL)
132 return -ENOMEM;
133 len = 0;
134 for (i = 0; i < argc; i++) {
135 if (i == 0 && found_target)
136 continue;
137
138 len += sprintf(&buf[len], "%s ", argv[i]);
139 }
140 params.mod_events = true;
141 ret = parse_probe_event(buf);
142 free(buf);
143 return ret;
144}
145
146static int opt_add_probe_event(const struct option *opt __used,
147 const char *str, int unset __used)
148{
149 if (str) {
150 params.mod_events = true;
151 return parse_probe_event(str);
152 } else
153 return 0;
154}
155
156static int opt_del_probe_event(const struct option *opt __used,
157 const char *str, int unset __used)
158{
159 if (str) {
160 params.mod_events = true;
161 if (!params.dellist)
162 params.dellist = strlist__new(true, NULL);
163 strlist__add(params.dellist, str);
164 }
165 return 0;
166}
167
168static int opt_set_target(const struct option *opt, const char *str,
169 int unset __used)
170{
171 int ret = -ENOENT;
172
173 if (str && !params.target) {
174 if (!strcmp(opt->long_name, "exec"))
175 params.uprobes = true;
176#ifdef DWARF_SUPPORT
177 else if (!strcmp(opt->long_name, "module"))
178 params.uprobes = false;
179#endif
180 else
181 return ret;
182
183 params.target = str;
184 ret = 0;
185 }
186
187 return ret;
188}
189
190#ifdef DWARF_SUPPORT
191static int opt_show_lines(const struct option *opt __used,
192 const char *str, int unset __used)
193{
194 int ret = 0;
195
196 if (!str)
197 return 0;
198
199 if (params.show_lines) {
200 pr_warning("Warning: more than one --line options are"
201 " detected. Only the first one is valid.\n");
202 return 0;
203 }
204
205 params.show_lines = true;
206 ret = parse_line_range_desc(str, ¶ms.line_range);
207 INIT_LIST_HEAD(¶ms.line_range.line_list);
208
209 return ret;
210}
211
212static int opt_show_vars(const struct option *opt __used,
213 const char *str, int unset __used)
214{
215 struct perf_probe_event *pev = ¶ms.events[params.nevents];
216 int ret;
217
218 if (!str)
219 return 0;
220
221 ret = parse_probe_event(str);
222 if (!ret && pev->nargs != 0) {
223 pr_err(" Error: '--vars' doesn't accept arguments.\n");
224 return -EINVAL;
225 }
226 params.show_vars = true;
227
228 return ret;
229}
230#endif
231
232static int opt_set_filter(const struct option *opt __used,
233 const char *str, int unset __used)
234{
235 const char *err;
236
237 if (str) {
238 pr_debug2("Set filter: %s\n", str);
239 if (params.filter)
240 strfilter__delete(params.filter);
241 params.filter = strfilter__new(str, &err);
242 if (!params.filter) {
243 pr_err("Filter parse error at %td.\n", err - str + 1);
244 pr_err("Source: \"%s\"\n", str);
245 pr_err(" %*c\n", (int)(err - str + 1), '^');
246 return -EINVAL;
247 }
248 }
249
250 return 0;
251}
252
253static const char * const probe_usage[] = {
254 "perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
255 "perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
256 "perf probe [<options>] --del '[GROUP:]EVENT' ...",
257 "perf probe --list",
258#ifdef DWARF_SUPPORT
259 "perf probe [<options>] --line 'LINEDESC'",
260 "perf probe [<options>] --vars 'PROBEPOINT'",
261#endif
262 NULL
263};
264
265static const struct option options[] = {
266 OPT_INCR('v', "verbose", &verbose,
267 "be more verbose (show parsed arguments, etc)"),
268 OPT_BOOLEAN('l', "list", ¶ms.list_events,
269 "list up current probe events"),
270 OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
271 opt_del_probe_event),
272 OPT_CALLBACK('a', "add", NULL,
273#ifdef DWARF_SUPPORT
274 "[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
275 " [[NAME=]ARG ...]",
276#else
277 "[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]",
278#endif
279 "probe point definition, where\n"
280 "\t\tGROUP:\tGroup name (optional)\n"
281 "\t\tEVENT:\tEvent name\n"
282 "\t\tFUNC:\tFunction name\n"
283 "\t\tOFF:\tOffset from function entry (in byte)\n"
284 "\t\t%return:\tPut the probe at function return\n"
285#ifdef DWARF_SUPPORT
286 "\t\tSRC:\tSource code path\n"
287 "\t\tRL:\tRelative line number from function entry.\n"
288 "\t\tAL:\tAbsolute line number in file.\n"
289 "\t\tPT:\tLazy expression of line code.\n"
290 "\t\tARG:\tProbe argument (local variable name or\n"
291 "\t\t\tkprobe-tracer argument format.)\n",
292#else
293 "\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
294#endif
295 opt_add_probe_event),
296 OPT_BOOLEAN('f', "force", ¶ms.force_add, "forcibly add events"
297 " with existing name"),
298#ifdef DWARF_SUPPORT
299 OPT_CALLBACK('L', "line", NULL,
300 "FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
301 "Show source code lines.", opt_show_lines),
302 OPT_CALLBACK('V', "vars", NULL,
303 "FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
304 "Show accessible variables on PROBEDEF", opt_show_vars),
305 OPT_BOOLEAN('\0', "externs", ¶ms.show_ext_vars,
306 "Show external variables too (with --vars only)"),
307 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
308 "file", "vmlinux pathname"),
309 OPT_STRING('s', "source", &symbol_conf.source_prefix,
310 "directory", "path to kernel source"),
311 OPT_CALLBACK('m', "module", NULL, "modname|path",
312 "target module name (for online) or path (for offline)",
313 opt_set_target),
314#endif
315 OPT__DRY_RUN(&probe_event_dry_run),
316 OPT_INTEGER('\0', "max-probes", ¶ms.max_probe_points,
317 "Set how many probe points can be found for a probe."),
318 OPT_BOOLEAN('F', "funcs", ¶ms.show_funcs,
319 "Show potential probe-able functions."),
320 OPT_CALLBACK('\0', "filter", NULL,
321 "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
322 "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
323 "\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
324 opt_set_filter),
325 OPT_CALLBACK('x', "exec", NULL, "executable|path",
326 "target executable name or path", opt_set_target),
327 OPT_END()
328};
329
330int cmd_probe(int argc, const char **argv, const char *prefix __used)
331{
332 int ret;
333
334 argc = parse_options(argc, argv, options, probe_usage,
335 PARSE_OPT_STOP_AT_NON_OPTION);
336 if (argc > 0) {
337 if (strcmp(argv[0], "-") == 0) {
338 pr_warning(" Error: '-' is not supported.\n");
339 usage_with_options(probe_usage, options);
340 }
341 ret = parse_probe_event_argv(argc, argv);
342 if (ret < 0) {
343 pr_err(" Error: Parse Error. (%d)\n", ret);
344 return ret;
345 }
346 }
347
348 if (params.max_probe_points == 0)
349 params.max_probe_points = MAX_PROBES;
350
351 if ((!params.nevents && !params.dellist && !params.list_events &&
352 !params.show_lines && !params.show_funcs))
353 usage_with_options(probe_usage, options);
354
355 /*
356 * Only consider the user's kernel image path if given.
357 */
358 symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
359
360 if (params.list_events) {
361 if (params.mod_events) {
362 pr_err(" Error: Don't use --list with --add/--del.\n");
363 usage_with_options(probe_usage, options);
364 }
365 if (params.show_lines) {
366 pr_err(" Error: Don't use --list with --line.\n");
367 usage_with_options(probe_usage, options);
368 }
369 if (params.show_vars) {
370 pr_err(" Error: Don't use --list with --vars.\n");
371 usage_with_options(probe_usage, options);
372 }
373 if (params.show_funcs) {
374 pr_err(" Error: Don't use --list with --funcs.\n");
375 usage_with_options(probe_usage, options);
376 }
377 if (params.uprobes) {
378 pr_warning(" Error: Don't use --list with --exec.\n");
379 usage_with_options(probe_usage, options);
380 }
381 ret = show_perf_probe_events();
382 if (ret < 0)
383 pr_err(" Error: Failed to show event list. (%d)\n",
384 ret);
385 return ret;
386 }
387 if (params.show_funcs) {
388 if (params.nevents != 0 || params.dellist) {
389 pr_err(" Error: Don't use --funcs with"
390 " --add/--del.\n");
391 usage_with_options(probe_usage, options);
392 }
393 if (params.show_lines) {
394 pr_err(" Error: Don't use --funcs with --line.\n");
395 usage_with_options(probe_usage, options);
396 }
397 if (params.show_vars) {
398 pr_err(" Error: Don't use --funcs with --vars.\n");
399 usage_with_options(probe_usage, options);
400 }
401 if (!params.filter)
402 params.filter = strfilter__new(DEFAULT_FUNC_FILTER,
403 NULL);
404 ret = show_available_funcs(params.target, params.filter,
405 params.uprobes);
406 strfilter__delete(params.filter);
407 if (ret < 0)
408 pr_err(" Error: Failed to show functions."
409 " (%d)\n", ret);
410 return ret;
411 }
412
413#ifdef DWARF_SUPPORT
414 if (params.show_lines && !params.uprobes) {
415 if (params.mod_events) {
416 pr_err(" Error: Don't use --line with"
417 " --add/--del.\n");
418 usage_with_options(probe_usage, options);
419 }
420 if (params.show_vars) {
421 pr_err(" Error: Don't use --line with --vars.\n");
422 usage_with_options(probe_usage, options);
423 }
424
425 ret = show_line_range(¶ms.line_range, params.target);
426 if (ret < 0)
427 pr_err(" Error: Failed to show lines. (%d)\n", ret);
428 return ret;
429 }
430 if (params.show_vars) {
431 if (params.mod_events) {
432 pr_err(" Error: Don't use --vars with"
433 " --add/--del.\n");
434 usage_with_options(probe_usage, options);
435 }
436 if (!params.filter)
437 params.filter = strfilter__new(DEFAULT_VAR_FILTER,
438 NULL);
439
440 ret = show_available_vars(params.events, params.nevents,
441 params.max_probe_points,
442 params.target,
443 params.filter,
444 params.show_ext_vars);
445 strfilter__delete(params.filter);
446 if (ret < 0)
447 pr_err(" Error: Failed to show vars. (%d)\n", ret);
448 return ret;
449 }
450#endif
451
452 if (params.dellist) {
453 ret = del_perf_probe_events(params.dellist);
454 strlist__delete(params.dellist);
455 if (ret < 0) {
456 pr_err(" Error: Failed to delete events. (%d)\n", ret);
457 return ret;
458 }
459 }
460
461 if (params.nevents) {
462 ret = add_perf_probe_events(params.events, params.nevents,
463 params.max_probe_points,
464 params.target,
465 params.force_add);
466 if (ret < 0) {
467 pr_err(" Error: Failed to add events. (%d)\n", ret);
468 return ret;
469 }
470 }
471 return 0;
472}
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"
38#include "util/strlist.h"
39#include "util/strfilter.h"
40#include "util/symbol.h"
41#include "util/debug.h"
42#include "util/debugfs.h"
43#include "util/parse-options.h"
44#include "util/probe-finder.h"
45#include "util/probe-event.h"
46
47#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
48#define DEFAULT_FUNC_FILTER "!_*"
49#define MAX_PATH_LEN 256
50
51/* Session management structure */
52static struct {
53 bool list_events;
54 bool force_add;
55 bool show_lines;
56 bool show_vars;
57 bool show_ext_vars;
58 bool show_funcs;
59 bool mod_events;
60 int nevents;
61 struct perf_probe_event events[MAX_PROBES];
62 struct strlist *dellist;
63 struct line_range line_range;
64 const char *target_module;
65 int max_probe_points;
66 struct strfilter *filter;
67} params;
68
69/* Parse an event definition. Note that any error must die. */
70static int parse_probe_event(const char *str)
71{
72 struct perf_probe_event *pev = ¶ms.events[params.nevents];
73 int ret;
74
75 pr_debug("probe-definition(%d): %s\n", params.nevents, str);
76 if (++params.nevents == MAX_PROBES) {
77 pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
78 return -1;
79 }
80
81 /* Parse a perf-probe command into event */
82 ret = parse_perf_probe_command(str, pev);
83 pr_debug("%d arguments\n", pev->nargs);
84
85 return ret;
86}
87
88static int parse_probe_event_argv(int argc, const char **argv)
89{
90 int i, len, ret;
91 char *buf;
92
93 /* Bind up rest arguments */
94 len = 0;
95 for (i = 0; i < argc; i++)
96 len += strlen(argv[i]) + 1;
97 buf = zalloc(len + 1);
98 if (buf == NULL)
99 return -ENOMEM;
100 len = 0;
101 for (i = 0; i < argc; i++)
102 len += sprintf(&buf[len], "%s ", argv[i]);
103 params.mod_events = true;
104 ret = parse_probe_event(buf);
105 free(buf);
106 return ret;
107}
108
109static int opt_add_probe_event(const struct option *opt __used,
110 const char *str, int unset __used)
111{
112 if (str) {
113 params.mod_events = true;
114 return parse_probe_event(str);
115 } else
116 return 0;
117}
118
119static int opt_del_probe_event(const struct option *opt __used,
120 const char *str, int unset __used)
121{
122 if (str) {
123 params.mod_events = true;
124 if (!params.dellist)
125 params.dellist = strlist__new(true, NULL);
126 strlist__add(params.dellist, str);
127 }
128 return 0;
129}
130
131#ifdef DWARF_SUPPORT
132static int opt_show_lines(const struct option *opt __used,
133 const char *str, int unset __used)
134{
135 int ret = 0;
136
137 if (!str)
138 return 0;
139
140 if (params.show_lines) {
141 pr_warning("Warning: more than one --line options are"
142 " detected. Only the first one is valid.\n");
143 return 0;
144 }
145
146 params.show_lines = true;
147 ret = parse_line_range_desc(str, ¶ms.line_range);
148 INIT_LIST_HEAD(¶ms.line_range.line_list);
149
150 return ret;
151}
152
153static int opt_show_vars(const struct option *opt __used,
154 const char *str, int unset __used)
155{
156 struct perf_probe_event *pev = ¶ms.events[params.nevents];
157 int ret;
158
159 if (!str)
160 return 0;
161
162 ret = parse_probe_event(str);
163 if (!ret && pev->nargs != 0) {
164 pr_err(" Error: '--vars' doesn't accept arguments.\n");
165 return -EINVAL;
166 }
167 params.show_vars = true;
168
169 return ret;
170}
171#endif
172
173static int opt_set_filter(const struct option *opt __used,
174 const char *str, int unset __used)
175{
176 const char *err;
177
178 if (str) {
179 pr_debug2("Set filter: %s\n", str);
180 if (params.filter)
181 strfilter__delete(params.filter);
182 params.filter = strfilter__new(str, &err);
183 if (!params.filter) {
184 pr_err("Filter parse error at %td.\n", err - str + 1);
185 pr_err("Source: \"%s\"\n", str);
186 pr_err(" %*c\n", (int)(err - str + 1), '^');
187 return -EINVAL;
188 }
189 }
190
191 return 0;
192}
193
194static const char * const probe_usage[] = {
195 "perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
196 "perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
197 "perf probe [<options>] --del '[GROUP:]EVENT' ...",
198 "perf probe --list",
199#ifdef DWARF_SUPPORT
200 "perf probe [<options>] --line 'LINEDESC'",
201 "perf probe [<options>] --vars 'PROBEPOINT'",
202#endif
203 NULL
204};
205
206static const struct option options[] = {
207 OPT_INCR('v', "verbose", &verbose,
208 "be more verbose (show parsed arguments, etc)"),
209 OPT_BOOLEAN('l', "list", ¶ms.list_events,
210 "list up current probe events"),
211 OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
212 opt_del_probe_event),
213 OPT_CALLBACK('a', "add", NULL,
214#ifdef DWARF_SUPPORT
215 "[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
216 " [[NAME=]ARG ...]",
217#else
218 "[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]",
219#endif
220 "probe point definition, where\n"
221 "\t\tGROUP:\tGroup name (optional)\n"
222 "\t\tEVENT:\tEvent name\n"
223 "\t\tFUNC:\tFunction name\n"
224 "\t\tOFF:\tOffset from function entry (in byte)\n"
225 "\t\t%return:\tPut the probe at function return\n"
226#ifdef DWARF_SUPPORT
227 "\t\tSRC:\tSource code path\n"
228 "\t\tRL:\tRelative line number from function entry.\n"
229 "\t\tAL:\tAbsolute line number in file.\n"
230 "\t\tPT:\tLazy expression of line code.\n"
231 "\t\tARG:\tProbe argument (local variable name or\n"
232 "\t\t\tkprobe-tracer argument format.)\n",
233#else
234 "\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
235#endif
236 opt_add_probe_event),
237 OPT_BOOLEAN('f', "force", ¶ms.force_add, "forcibly add events"
238 " with existing name"),
239#ifdef DWARF_SUPPORT
240 OPT_CALLBACK('L', "line", NULL,
241 "FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
242 "Show source code lines.", opt_show_lines),
243 OPT_CALLBACK('V', "vars", NULL,
244 "FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
245 "Show accessible variables on PROBEDEF", opt_show_vars),
246 OPT_BOOLEAN('\0', "externs", ¶ms.show_ext_vars,
247 "Show external variables too (with --vars only)"),
248 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
249 "file", "vmlinux pathname"),
250 OPT_STRING('s', "source", &symbol_conf.source_prefix,
251 "directory", "path to kernel source"),
252 OPT_STRING('m', "module", ¶ms.target_module,
253 "modname|path",
254 "target module name (for online) or path (for offline)"),
255#endif
256 OPT__DRY_RUN(&probe_event_dry_run),
257 OPT_INTEGER('\0', "max-probes", ¶ms.max_probe_points,
258 "Set how many probe points can be found for a probe."),
259 OPT_BOOLEAN('F', "funcs", ¶ms.show_funcs,
260 "Show potential probe-able functions."),
261 OPT_CALLBACK('\0', "filter", NULL,
262 "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
263 "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
264 "\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
265 opt_set_filter),
266 OPT_END()
267};
268
269int cmd_probe(int argc, const char **argv, const char *prefix __used)
270{
271 int ret;
272
273 argc = parse_options(argc, argv, options, probe_usage,
274 PARSE_OPT_STOP_AT_NON_OPTION);
275 if (argc > 0) {
276 if (strcmp(argv[0], "-") == 0) {
277 pr_warning(" Error: '-' is not supported.\n");
278 usage_with_options(probe_usage, options);
279 }
280 ret = parse_probe_event_argv(argc, argv);
281 if (ret < 0) {
282 pr_err(" Error: Parse Error. (%d)\n", ret);
283 return ret;
284 }
285 }
286
287 if (params.max_probe_points == 0)
288 params.max_probe_points = MAX_PROBES;
289
290 if ((!params.nevents && !params.dellist && !params.list_events &&
291 !params.show_lines && !params.show_funcs))
292 usage_with_options(probe_usage, options);
293
294 /*
295 * Only consider the user's kernel image path if given.
296 */
297 symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
298
299 if (params.list_events) {
300 if (params.mod_events) {
301 pr_err(" Error: Don't use --list with --add/--del.\n");
302 usage_with_options(probe_usage, options);
303 }
304 if (params.show_lines) {
305 pr_err(" Error: Don't use --list with --line.\n");
306 usage_with_options(probe_usage, options);
307 }
308 if (params.show_vars) {
309 pr_err(" Error: Don't use --list with --vars.\n");
310 usage_with_options(probe_usage, options);
311 }
312 if (params.show_funcs) {
313 pr_err(" Error: Don't use --list with --funcs.\n");
314 usage_with_options(probe_usage, options);
315 }
316 ret = show_perf_probe_events();
317 if (ret < 0)
318 pr_err(" Error: Failed to show event list. (%d)\n",
319 ret);
320 return ret;
321 }
322 if (params.show_funcs) {
323 if (params.nevents != 0 || params.dellist) {
324 pr_err(" Error: Don't use --funcs with"
325 " --add/--del.\n");
326 usage_with_options(probe_usage, options);
327 }
328 if (params.show_lines) {
329 pr_err(" Error: Don't use --funcs with --line.\n");
330 usage_with_options(probe_usage, options);
331 }
332 if (params.show_vars) {
333 pr_err(" Error: Don't use --funcs with --vars.\n");
334 usage_with_options(probe_usage, options);
335 }
336 if (!params.filter)
337 params.filter = strfilter__new(DEFAULT_FUNC_FILTER,
338 NULL);
339 ret = show_available_funcs(params.target_module,
340 params.filter);
341 strfilter__delete(params.filter);
342 if (ret < 0)
343 pr_err(" Error: Failed to show functions."
344 " (%d)\n", ret);
345 return ret;
346 }
347
348#ifdef DWARF_SUPPORT
349 if (params.show_lines) {
350 if (params.mod_events) {
351 pr_err(" Error: Don't use --line with"
352 " --add/--del.\n");
353 usage_with_options(probe_usage, options);
354 }
355 if (params.show_vars) {
356 pr_err(" Error: Don't use --line with --vars.\n");
357 usage_with_options(probe_usage, options);
358 }
359
360 ret = show_line_range(¶ms.line_range, params.target_module);
361 if (ret < 0)
362 pr_err(" Error: Failed to show lines. (%d)\n", ret);
363 return ret;
364 }
365 if (params.show_vars) {
366 if (params.mod_events) {
367 pr_err(" Error: Don't use --vars with"
368 " --add/--del.\n");
369 usage_with_options(probe_usage, options);
370 }
371 if (!params.filter)
372 params.filter = strfilter__new(DEFAULT_VAR_FILTER,
373 NULL);
374
375 ret = show_available_vars(params.events, params.nevents,
376 params.max_probe_points,
377 params.target_module,
378 params.filter,
379 params.show_ext_vars);
380 strfilter__delete(params.filter);
381 if (ret < 0)
382 pr_err(" Error: Failed to show vars. (%d)\n", ret);
383 return ret;
384 }
385#endif
386
387 if (params.dellist) {
388 ret = del_perf_probe_events(params.dellist);
389 strlist__delete(params.dellist);
390 if (ret < 0) {
391 pr_err(" Error: Failed to delete events. (%d)\n", ret);
392 return ret;
393 }
394 }
395
396 if (params.nevents) {
397 ret = add_perf_probe_events(params.events, params.nevents,
398 params.max_probe_points,
399 params.target_module,
400 params.force_add);
401 if (ret < 0) {
402 pr_err(" Error: Failed to add events. (%d)\n", ret);
403 return ret;
404 }
405 }
406 return 0;
407}