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USB: serial: add special case for processing of empty read urbs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / trace / trace_kprobe.c
blob1251e367bae9efe6a0e460861abecb4049296b5a
1 /*
2 * Kprobes-based tracing events
3 *
4 * Created by Masami Hiramatsu <mhiramat@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #include <linux/module.h>
21 #include <linux/uaccess.h>
22 #include <linux/kprobes.h>
23 #include <linux/seq_file.h>
24 #include <linux/slab.h>
25 #include <linux/smp.h>
26 #include <linux/debugfs.h>
27 #include <linux/types.h>
28 #include <linux/string.h>
29 #include <linux/ctype.h>
30 #include <linux/ptrace.h>
31 #include <linux/perf_event.h>
32
33 #include "trace.h"
34 #include "trace_output.h"
35
36 #define MAX_TRACE_ARGS 128
37 #define MAX_ARGSTR_LEN 63
38 #define MAX_EVENT_NAME_LEN 64
39 #define KPROBE_EVENT_SYSTEM "kprobes"
40
41 /* Reserved field names */
42 #define FIELD_STRING_IP "__probe_ip"
43 #define FIELD_STRING_NARGS "__probe_nargs"
44 #define FIELD_STRING_RETIP "__probe_ret_ip"
45 #define FIELD_STRING_FUNC "__probe_func"
46
47 const char *reserved_field_names[] = {
48 "common_type",
49 "common_flags",
50 "common_preempt_count",
51 "common_pid",
52 "common_tgid",
53 "common_lock_depth",
54 FIELD_STRING_IP,
55 FIELD_STRING_NARGS,
56 FIELD_STRING_RETIP,
57 FIELD_STRING_FUNC,
58 };
59
60 struct fetch_func {
61 unsigned long (*func)(struct pt_regs *, void *);
62 void *data;
63 };
64
65 static __kprobes unsigned long call_fetch(struct fetch_func *f,
66 struct pt_regs *regs)
67 {
68 return f->func(regs, f->data);
69 }
70
71 /* fetch handlers */
72 static __kprobes unsigned long fetch_register(struct pt_regs *regs,
73 void *offset)
74 {
75 return regs_get_register(regs, (unsigned int)((unsigned long)offset));
76 }
77
78 static __kprobes unsigned long fetch_stack(struct pt_regs *regs,
79 void *num)
80 {
81 return regs_get_kernel_stack_nth(regs,
82 (unsigned int)((unsigned long)num));
83 }
84
85 static __kprobes unsigned long fetch_memory(struct pt_regs *regs, void *addr)
86 {
87 unsigned long retval;
88
89 if (probe_kernel_address(addr, retval))
90 return 0;
91 return retval;
92 }
93
94 static __kprobes unsigned long fetch_retvalue(struct pt_regs *regs,
95 void *dummy)
96 {
97 return regs_return_value(regs);
98 }
99
100 static __kprobes unsigned long fetch_stack_address(struct pt_regs *regs,
101 void *dummy)
102 {
103 return kernel_stack_pointer(regs);
104 }
105
106 /* Memory fetching by symbol */
107 struct symbol_cache {
108 char *symbol;
109 long offset;
110 unsigned long addr;
111 };
112
113 static unsigned long update_symbol_cache(struct symbol_cache *sc)
114 {
115 sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
116 if (sc->addr)
117 sc->addr += sc->offset;
118 return sc->addr;
119 }
120
121 static void free_symbol_cache(struct symbol_cache *sc)
122 {
123 kfree(sc->symbol);
124 kfree(sc);
125 }
126
127 static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
128 {
129 struct symbol_cache *sc;
130
131 if (!sym || strlen(sym) == 0)
132 return NULL;
133 sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
134 if (!sc)
135 return NULL;
136
137 sc->symbol = kstrdup(sym, GFP_KERNEL);
138 if (!sc->symbol) {
139 kfree(sc);
140 return NULL;
141 }
142 sc->offset = offset;
143
144 update_symbol_cache(sc);
145 return sc;
146 }
147
148 static __kprobes unsigned long fetch_symbol(struct pt_regs *regs, void *data)
149 {
150 struct symbol_cache *sc = data;
151
152 if (sc->addr)
153 return fetch_memory(regs, (void *)sc->addr);
154 else
155 return 0;
156 }
157
158 /* Special indirect memory access interface */
159 struct indirect_fetch_data {
160 struct fetch_func orig;
161 long offset;
162 };
163
164 static __kprobes unsigned long fetch_indirect(struct pt_regs *regs, void *data)
165 {
166 struct indirect_fetch_data *ind = data;
167 unsigned long addr;
168
169 addr = call_fetch(&ind->orig, regs);
170 if (addr) {
171 addr += ind->offset;
172 return fetch_memory(regs, (void *)addr);
173 } else
174 return 0;
175 }
176
177 static __kprobes void free_indirect_fetch_data(struct indirect_fetch_data *data)
178 {
179 if (data->orig.func == fetch_indirect)
180 free_indirect_fetch_data(data->orig.data);
181 else if (data->orig.func == fetch_symbol)
182 free_symbol_cache(data->orig.data);
183 kfree(data);
184 }
185
186 /**
187 * Kprobe event core functions
188 */
189
190 struct probe_arg {
191 struct fetch_func fetch;
192 const char *name;
193 };
194
195 /* Flags for trace_probe */
196 #define TP_FLAG_TRACE 1
197 #define TP_FLAG_PROFILE 2
198
199 struct trace_probe {
200 struct list_head list;
201 struct kretprobe rp; /* Use rp.kp for kprobe use */
202 unsigned long nhit;
203 unsigned int flags; /* For TP_FLAG_* */
204 const char *symbol; /* symbol name */
205 struct ftrace_event_call call;
206 struct trace_event event;
207 unsigned int nr_args;
208 struct probe_arg args[];
209 };
210
211 #define SIZEOF_TRACE_PROBE(n) \
212 (offsetof(struct trace_probe, args) + \
213 (sizeof(struct probe_arg) * (n)))
214
215 static __kprobes int probe_is_return(struct trace_probe *tp)
216 {
217 return tp->rp.handler != NULL;
218 }
219
220 static __kprobes const char *probe_symbol(struct trace_probe *tp)
221 {
222 return tp->symbol ? tp->symbol : "unknown";
223 }
224
225 static int probe_arg_string(char *buf, size_t n, struct fetch_func *ff)
226 {
227 int ret = -EINVAL;
228
229 if (ff->func == fetch_register) {
230 const char *name;
231 name = regs_query_register_name((unsigned int)((long)ff->data));
232 ret = snprintf(buf, n, "%%%s", name);
233 } else if (ff->func == fetch_stack)
234 ret = snprintf(buf, n, "$stack%lu", (unsigned long)ff->data);
235 else if (ff->func == fetch_memory)
236 ret = snprintf(buf, n, "@0x%p", ff->data);
237 else if (ff->func == fetch_symbol) {
238 struct symbol_cache *sc = ff->data;
239 if (sc->offset)
240 ret = snprintf(buf, n, "@%s%+ld", sc->symbol,
241 sc->offset);
242 else
243 ret = snprintf(buf, n, "@%s", sc->symbol);
244 } else if (ff->func == fetch_retvalue)
245 ret = snprintf(buf, n, "$retval");
246 else if (ff->func == fetch_stack_address)
247 ret = snprintf(buf, n, "$stack");
248 else if (ff->func == fetch_indirect) {
249 struct indirect_fetch_data *id = ff->data;
250 size_t l = 0;
251 ret = snprintf(buf, n, "%+ld(", id->offset);
252 if (ret >= n)
253 goto end;
254 l += ret;
255 ret = probe_arg_string(buf + l, n - l, &id->orig);
256 if (ret < 0)
257 goto end;
258 l += ret;
259 ret = snprintf(buf + l, n - l, ")");
260 ret += l;
261 }
262 end:
263 if (ret >= n)
264 return -ENOSPC;
265 return ret;
266 }
267
268 static int register_probe_event(struct trace_probe *tp);
269 static void unregister_probe_event(struct trace_probe *tp);
270
271 static DEFINE_MUTEX(probe_lock);
272 static LIST_HEAD(probe_list);
273
274 static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
275 static int kretprobe_dispatcher(struct kretprobe_instance *ri,
276 struct pt_regs *regs);
277
278 /* Check the name is good for event/group */
279 static int check_event_name(const char *name)
280 {
281 if (!isalpha(*name) && *name != '_')
282 return 0;
283 while (*++name != '\0') {
284 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
285 return 0;
286 }
287 return 1;
288 }
289
290 /*
291 * Allocate new trace_probe and initialize it (including kprobes).
292 */
293 static struct trace_probe *alloc_trace_probe(const char *group,
294 const char *event,
295 void *addr,
296 const char *symbol,
297 unsigned long offs,
298 int nargs, int is_return)
299 {
300 struct trace_probe *tp;
301 int ret = -ENOMEM;
302
303 tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL);
304 if (!tp)
305 return ERR_PTR(ret);
306
307 if (symbol) {
308 tp->symbol = kstrdup(symbol, GFP_KERNEL);
309 if (!tp->symbol)
310 goto error;
311 tp->rp.kp.symbol_name = tp->symbol;
312 tp->rp.kp.offset = offs;
313 } else
314 tp->rp.kp.addr = addr;
315
316 if (is_return)
317 tp->rp.handler = kretprobe_dispatcher;
318 else
319 tp->rp.kp.pre_handler = kprobe_dispatcher;
320
321 if (!event || !check_event_name(event)) {
322 ret = -EINVAL;
323 goto error;
324 }
325
326 tp->call.name = kstrdup(event, GFP_KERNEL);
327 if (!tp->call.name)
328 goto error;
329
330 if (!group || !check_event_name(group)) {
331 ret = -EINVAL;
332 goto error;
333 }
334
335 tp->call.system = kstrdup(group, GFP_KERNEL);
336 if (!tp->call.system)
337 goto error;
338
339 INIT_LIST_HEAD(&tp->list);
340 return tp;
341 error:
342 kfree(tp->call.name);
343 kfree(tp->symbol);
344 kfree(tp);
345 return ERR_PTR(ret);
346 }
347
348 static void free_probe_arg(struct probe_arg *arg)
349 {
350 if (arg->fetch.func == fetch_symbol)
351 free_symbol_cache(arg->fetch.data);
352 else if (arg->fetch.func == fetch_indirect)
353 free_indirect_fetch_data(arg->fetch.data);
354 kfree(arg->name);
355 }
356
357 static void free_trace_probe(struct trace_probe *tp)
358 {
359 int i;
360
361 for (i = 0; i < tp->nr_args; i++)
362 free_probe_arg(&tp->args[i]);
363
364 kfree(tp->call.system);
365 kfree(tp->call.name);
366 kfree(tp->symbol);
367 kfree(tp);
368 }
369
370 static struct trace_probe *find_probe_event(const char *event,
371 const char *group)
372 {
373 struct trace_probe *tp;
374
375 list_for_each_entry(tp, &probe_list, list)
376 if (strcmp(tp->call.name, event) == 0 &&
377 strcmp(tp->call.system, group) == 0)
378 return tp;
379 return NULL;
380 }
381
382 /* Unregister a trace_probe and probe_event: call with locking probe_lock */
383 static void unregister_trace_probe(struct trace_probe *tp)
384 {
385 if (probe_is_return(tp))
386 unregister_kretprobe(&tp->rp);
387 else
388 unregister_kprobe(&tp->rp.kp);
389 list_del(&tp->list);
390 unregister_probe_event(tp);
391 }
392
393 /* Register a trace_probe and probe_event */
394 static int register_trace_probe(struct trace_probe *tp)
395 {
396 struct trace_probe *old_tp;
397 int ret;
398
399 mutex_lock(&probe_lock);
400
401 /* register as an event */
402 old_tp = find_probe_event(tp->call.name, tp->call.system);
403 if (old_tp) {
404 /* delete old event */
405 unregister_trace_probe(old_tp);
406 free_trace_probe(old_tp);
407 }
408 ret = register_probe_event(tp);
409 if (ret) {
410 pr_warning("Faild to register probe event(%d)\n", ret);
411 goto end;
412 }
413
414 tp->rp.kp.flags |= KPROBE_FLAG_DISABLED;
415 if (probe_is_return(tp))
416 ret = register_kretprobe(&tp->rp);
417 else
418 ret = register_kprobe(&tp->rp.kp);
419
420 if (ret) {
421 pr_warning("Could not insert probe(%d)\n", ret);
422 if (ret == -EILSEQ) {
423 pr_warning("Probing address(0x%p) is not an "
424 "instruction boundary.\n",
425 tp->rp.kp.addr);
426 ret = -EINVAL;
427 }
428 unregister_probe_event(tp);
429 } else
430 list_add_tail(&tp->list, &probe_list);
431 end:
432 mutex_unlock(&probe_lock);
433 return ret;
434 }
435
436 /* Split symbol and offset. */
437 static int split_symbol_offset(char *symbol, unsigned long *offset)
438 {
439 char *tmp;
440 int ret;
441
442 if (!offset)
443 return -EINVAL;
444
445 tmp = strchr(symbol, '+');
446 if (tmp) {
447 /* skip sign because strict_strtol doesn't accept '+' */
448 ret = strict_strtoul(tmp + 1, 0, offset);
449 if (ret)
450 return ret;
451 *tmp = '\0';
452 } else
453 *offset = 0;
454 return 0;
455 }
456
457 #define PARAM_MAX_ARGS 16
458 #define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
459
460 static int parse_probe_vars(char *arg, struct fetch_func *ff, int is_return)
461 {
462 int ret = 0;
463 unsigned long param;
464
465 if (strcmp(arg, "retval") == 0) {
466 if (is_return) {
467 ff->func = fetch_retvalue;
468 ff->data = NULL;
469 } else
470 ret = -EINVAL;
471 } else if (strncmp(arg, "stack", 5) == 0) {
472 if (arg[5] == '\0') {
473 ff->func = fetch_stack_address;
474 ff->data = NULL;
475 } else if (isdigit(arg[5])) {
476 ret = strict_strtoul(arg + 5, 10, &param);
477 if (ret || param > PARAM_MAX_STACK)
478 ret = -EINVAL;
479 else {
480 ff->func = fetch_stack;
481 ff->data = (void *)param;
482 }
483 } else
484 ret = -EINVAL;
485 } else
486 ret = -EINVAL;
487 return ret;
488 }
489
490 /* Recursive argument parser */
491 static int __parse_probe_arg(char *arg, struct fetch_func *ff, int is_return)
492 {
493 int ret = 0;
494 unsigned long param;
495 long offset;
496 char *tmp;
497
498 switch (arg[0]) {
499 case '$':
500 ret = parse_probe_vars(arg + 1, ff, is_return);
501 break;
502 case '%': /* named register */
503 ret = regs_query_register_offset(arg + 1);
504 if (ret >= 0) {
505 ff->func = fetch_register;
506 ff->data = (void *)(unsigned long)ret;
507 ret = 0;
508 }
509 break;
510 case '@': /* memory or symbol */
511 if (isdigit(arg[1])) {
512 ret = strict_strtoul(arg + 1, 0, &param);
513 if (ret)
514 break;
515 ff->func = fetch_memory;
516 ff->data = (void *)param;
517 } else {
518 ret = split_symbol_offset(arg + 1, &offset);
519 if (ret)
520 break;
521 ff->data = alloc_symbol_cache(arg + 1, offset);
522 if (ff->data)
523 ff->func = fetch_symbol;
524 else
525 ret = -EINVAL;
526 }
527 break;
528 case '+': /* indirect memory */
529 case '-':
530 tmp = strchr(arg, '(');
531 if (!tmp) {
532 ret = -EINVAL;
533 break;
534 }
535 *tmp = '\0';
536 ret = strict_strtol(arg + 1, 0, &offset);
537 if (ret)
538 break;
539 if (arg[0] == '-')
540 offset = -offset;
541 arg = tmp + 1;
542 tmp = strrchr(arg, ')');
543 if (tmp) {
544 struct indirect_fetch_data *id;
545 *tmp = '\0';
546 id = kzalloc(sizeof(struct indirect_fetch_data),
547 GFP_KERNEL);
548 if (!id)
549 return -ENOMEM;
550 id->offset = offset;
551 ret = __parse_probe_arg(arg, &id->orig, is_return);
552 if (ret)
553 kfree(id);
554 else {
555 ff->func = fetch_indirect;
556 ff->data = (void *)id;
557 }
558 } else
559 ret = -EINVAL;
560 break;
561 default:
562 /* TODO: support custom handler */
563 ret = -EINVAL;
564 }
565 return ret;
566 }
567
568 /* String length checking wrapper */
569 static int parse_probe_arg(char *arg, struct fetch_func *ff, int is_return)
570 {
571 if (strlen(arg) > MAX_ARGSTR_LEN) {
572 pr_info("Argument is too long.: %s\n", arg);
573 return -ENOSPC;
574 }
575 return __parse_probe_arg(arg, ff, is_return);
576 }
577
578 /* Return 1 if name is reserved or already used by another argument */
579 static int conflict_field_name(const char *name,
580 struct probe_arg *args, int narg)
581 {
582 int i;
583 for (i = 0; i < ARRAY_SIZE(reserved_field_names); i++)
584 if (strcmp(reserved_field_names[i], name) == 0)
585 return 1;
586 for (i = 0; i < narg; i++)
587 if (strcmp(args[i].name, name) == 0)
588 return 1;
589 return 0;
590 }
591
592 static int create_trace_probe(int argc, char **argv)
593 {
594 /*
595 * Argument syntax:
596 * - Add kprobe: p[:[GRP/]EVENT] KSYM[+OFFS]|KADDR [FETCHARGS]
597 * - Add kretprobe: r[:[GRP/]EVENT] KSYM[+0] [FETCHARGS]
598 * Fetch args:
599 * $retval : fetch return value
600 * $stack : fetch stack address
601 * $stackN : fetch Nth of stack (N:0-)
602 * @ADDR : fetch memory at ADDR (ADDR should be in kernel)
603 * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol)
604 * %REG : fetch register REG
605 * Indirect memory fetch:
606 * +|-offs(ARG) : fetch memory at ARG +|- offs address.
607 * Alias name of args:
608 * NAME=FETCHARG : set NAME as alias of FETCHARG.
609 */
610 struct trace_probe *tp;
611 int i, ret = 0;
612 int is_return = 0, is_delete = 0;
613 char *symbol = NULL, *event = NULL, *arg = NULL, *group = NULL;
614 unsigned long offset = 0;
615 void *addr = NULL;
616 char buf[MAX_EVENT_NAME_LEN];
617
618 /* argc must be >= 1 */
619 if (argv[0][0] == 'p')
620 is_return = 0;
621 else if (argv[0][0] == 'r')
622 is_return = 1;
623 else if (argv[0][0] == '-')
624 is_delete = 1;
625 else {
626 pr_info("Probe definition must be started with 'p', 'r' or"
627 " '-'.\n");
628 return -EINVAL;
629 }
630
631 if (argv[0][1] == ':') {
632 event = &argv[0][2];
633 if (strchr(event, '/')) {
634 group = event;
635 event = strchr(group, '/') + 1;
636 event[-1] = '\0';
637 if (strlen(group) == 0) {
638 pr_info("Group name is not specified\n");
639 return -EINVAL;
640 }
641 }
642 if (strlen(event) == 0) {
643 pr_info("Event name is not specified\n");
644 return -EINVAL;
645 }
646 }
647 if (!group)
648 group = KPROBE_EVENT_SYSTEM;
649
650 if (is_delete) {
651 if (!event) {
652 pr_info("Delete command needs an event name.\n");
653 return -EINVAL;
654 }
655 tp = find_probe_event(event, group);
656 if (!tp) {
657 pr_info("Event %s/%s doesn't exist.\n", group, event);
658 return -ENOENT;
659 }
660 /* delete an event */
661 unregister_trace_probe(tp);
662 free_trace_probe(tp);
663 return 0;
664 }
665
666 if (argc < 2) {
667 pr_info("Probe point is not specified.\n");
668 return -EINVAL;
669 }
670 if (isdigit(argv[1][0])) {
671 if (is_return) {
672 pr_info("Return probe point must be a symbol.\n");
673 return -EINVAL;
674 }
675 /* an address specified */
676 ret = strict_strtoul(&argv[1][0], 0, (unsigned long *)&addr);
677 if (ret) {
678 pr_info("Failed to parse address.\n");
679 return ret;
680 }
681 } else {
682 /* a symbol specified */
683 symbol = argv[1];
684 /* TODO: support .init module functions */
685 ret = split_symbol_offset(symbol, &offset);
686 if (ret) {
687 pr_info("Failed to parse symbol.\n");
688 return ret;
689 }
690 if (offset && is_return) {
691 pr_info("Return probe must be used without offset.\n");
692 return -EINVAL;
693 }
694 }
695 argc -= 2; argv += 2;
696
697 /* setup a probe */
698 if (!event) {
699 /* Make a new event name */
700 if (symbol)
701 snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld",
702 is_return ? 'r' : 'p', symbol, offset);
703 else
704 snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p",
705 is_return ? 'r' : 'p', addr);
706 event = buf;
707 }
708 tp = alloc_trace_probe(group, event, addr, symbol, offset, argc,
709 is_return);
710 if (IS_ERR(tp)) {
711 pr_info("Failed to allocate trace_probe.(%d)\n",
712 (int)PTR_ERR(tp));
713 return PTR_ERR(tp);
714 }
715
716 /* parse arguments */
717 ret = 0;
718 for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
719 /* Parse argument name */
720 arg = strchr(argv[i], '=');
721 if (arg)
722 *arg++ = '\0';
723 else
724 arg = argv[i];
725
726 if (conflict_field_name(argv[i], tp->args, i)) {
727 pr_info("Argument%d name '%s' conflicts with "
728 "another field.\n", i, argv[i]);
729 ret = -EINVAL;
730 goto error;
731 }
732
733 tp->args[i].name = kstrdup(argv[i], GFP_KERNEL);
734 if (!tp->args[i].name) {
735 pr_info("Failed to allocate argument%d name '%s'.\n",
736 i, argv[i]);
737 ret = -ENOMEM;
738 goto error;
739 }
740
741 /* Parse fetch argument */
742 ret = parse_probe_arg(arg, &tp->args[i].fetch, is_return);
743 if (ret) {
744 pr_info("Parse error at argument%d. (%d)\n", i, ret);
745 kfree(tp->args[i].name);
746 goto error;
747 }
748
749 tp->nr_args++;
750 }
751
752 ret = register_trace_probe(tp);
753 if (ret)
754 goto error;
755 return 0;
756
757 error:
758 free_trace_probe(tp);
759 return ret;
760 }
761
762 static void cleanup_all_probes(void)
763 {
764 struct trace_probe *tp;
765
766 mutex_lock(&probe_lock);
767 /* TODO: Use batch unregistration */
768 while (!list_empty(&probe_list)) {
769 tp = list_entry(probe_list.next, struct trace_probe, list);
770 unregister_trace_probe(tp);
771 free_trace_probe(tp);
772 }
773 mutex_unlock(&probe_lock);
774 }
775
776
777 /* Probes listing interfaces */
778 static void *probes_seq_start(struct seq_file *m, loff_t *pos)
779 {
780 mutex_lock(&probe_lock);
781 return seq_list_start(&probe_list, *pos);
782 }
783
784 static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos)
785 {
786 return seq_list_next(v, &probe_list, pos);
787 }
788
789 static void probes_seq_stop(struct seq_file *m, void *v)
790 {
791 mutex_unlock(&probe_lock);
792 }
793
794 static int probes_seq_show(struct seq_file *m, void *v)
795 {
796 struct trace_probe *tp = v;
797 int i, ret;
798 char buf[MAX_ARGSTR_LEN + 1];
799
800 seq_printf(m, "%c", probe_is_return(tp) ? 'r' : 'p');
801 seq_printf(m, ":%s/%s", tp->call.system, tp->call.name);
802
803 if (!tp->symbol)
804 seq_printf(m, " 0x%p", tp->rp.kp.addr);
805 else if (tp->rp.kp.offset)
806 seq_printf(m, " %s+%u", probe_symbol(tp), tp->rp.kp.offset);
807 else
808 seq_printf(m, " %s", probe_symbol(tp));
809
810 for (i = 0; i < tp->nr_args; i++) {
811 ret = probe_arg_string(buf, MAX_ARGSTR_LEN, &tp->args[i].fetch);
812 if (ret < 0) {
813 pr_warning("Argument%d decoding error(%d).\n", i, ret);
814 return ret;
815 }
816 seq_printf(m, " %s=%s", tp->args[i].name, buf);
817 }
818 seq_printf(m, "\n");
819 return 0;
820 }
821
822 static const struct seq_operations probes_seq_op = {
823 .start = probes_seq_start,
824 .next = probes_seq_next,
825 .stop = probes_seq_stop,
826 .show = probes_seq_show
827 };
828
829 static int probes_open(struct inode *inode, struct file *file)
830 {
831 if ((file->f_mode & FMODE_WRITE) &&
832 (file->f_flags & O_TRUNC))
833 cleanup_all_probes();
834
835 return seq_open(file, &probes_seq_op);
836 }
837
838 static int command_trace_probe(const char *buf)
839 {
840 char **argv;
841 int argc = 0, ret = 0;
842
843 argv = argv_split(GFP_KERNEL, buf, &argc);
844 if (!argv)
845 return -ENOMEM;
846
847 if (argc)
848 ret = create_trace_probe(argc, argv);
849
850 argv_free(argv);
851 return ret;
852 }
853
854 #define WRITE_BUFSIZE 128
855
856 static ssize_t probes_write(struct file *file, const char __user *buffer,
857 size_t count, loff_t *ppos)
858 {
859 char *kbuf, *tmp;
860 int ret;
861 size_t done;
862 size_t size;
863
864 kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL);
865 if (!kbuf)
866 return -ENOMEM;
867
868 ret = done = 0;
869 while (done < count) {
870 size = count - done;
871 if (size >= WRITE_BUFSIZE)
872 size = WRITE_BUFSIZE - 1;
873 if (copy_from_user(kbuf, buffer + done, size)) {
874 ret = -EFAULT;
875 goto out;
876 }
877 kbuf[size] = '\0';
878 tmp = strchr(kbuf, '\n');
879 if (tmp) {
880 *tmp = '\0';
881 size = tmp - kbuf + 1;
882 } else if (done + size < count) {
883 pr_warning("Line length is too long: "
884 "Should be less than %d.", WRITE_BUFSIZE);
885 ret = -EINVAL;
886 goto out;
887 }
888 done += size;
889 /* Remove comments */
890 tmp = strchr(kbuf, '#');
891 if (tmp)
892 *tmp = '\0';
893
894 ret = command_trace_probe(kbuf);
895 if (ret)
896 goto out;
897 }
898 ret = done;
899 out:
900 kfree(kbuf);
901 return ret;
902 }
903
904 static const struct file_operations kprobe_events_ops = {
905 .owner = THIS_MODULE,
906 .open = probes_open,
907 .read = seq_read,
908 .llseek = seq_lseek,
909 .release = seq_release,
910 .write = probes_write,
911 };
912
913 /* Probes profiling interfaces */
914 static int probes_profile_seq_show(struct seq_file *m, void *v)
915 {
916 struct trace_probe *tp = v;
917
918 seq_printf(m, " %-44s %15lu %15lu\n", tp->call.name, tp->nhit,
919 tp->rp.kp.nmissed);
920
921 return 0;
922 }
923
924 static const struct seq_operations profile_seq_op = {
925 .start = probes_seq_start,
926 .next = probes_seq_next,
927 .stop = probes_seq_stop,
928 .show = probes_profile_seq_show
929 };
930
931 static int profile_open(struct inode *inode, struct file *file)
932 {
933 return seq_open(file, &profile_seq_op);
934 }
935
936 static const struct file_operations kprobe_profile_ops = {
937 .owner = THIS_MODULE,
938 .open = profile_open,
939 .read = seq_read,
940 .llseek = seq_lseek,
941 .release = seq_release,
942 };
943
944 /* Kprobe handler */
945 static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
946 {
947 struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
948 struct kprobe_trace_entry *entry;
949 struct ring_buffer_event *event;
950 struct ring_buffer *buffer;
951 int size, i, pc;
952 unsigned long irq_flags;
953 struct ftrace_event_call *call = &tp->call;
954
955 tp->nhit++;
956
957 local_save_flags(irq_flags);
958 pc = preempt_count();
959
960 size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args);
961
962 event = trace_current_buffer_lock_reserve(&buffer, call->id, size,
963 irq_flags, pc);
964 if (!event)
965 return;
966
967 entry = ring_buffer_event_data(event);
968 entry->nargs = tp->nr_args;
969 entry->ip = (unsigned long)kp->addr;
970 for (i = 0; i < tp->nr_args; i++)
971 entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
972
973 if (!filter_current_check_discard(buffer, call, entry, event))
974 trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
975 }
976
977 /* Kretprobe handler */
978 static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
979 struct pt_regs *regs)
980 {
981 struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
982 struct kretprobe_trace_entry *entry;
983 struct ring_buffer_event *event;
984 struct ring_buffer *buffer;
985 int size, i, pc;
986 unsigned long irq_flags;
987 struct ftrace_event_call *call = &tp->call;
988
989 local_save_flags(irq_flags);
990 pc = preempt_count();
991
992 size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args);
993
994 event = trace_current_buffer_lock_reserve(&buffer, call->id, size,
995 irq_flags, pc);
996 if (!event)
997 return;
998
999 entry = ring_buffer_event_data(event);
1000 entry->nargs = tp->nr_args;
1001 entry->func = (unsigned long)tp->rp.kp.addr;
1002 entry->ret_ip = (unsigned long)ri->ret_addr;
1003 for (i = 0; i < tp->nr_args; i++)
1004 entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
1005
1006 if (!filter_current_check_discard(buffer, call, entry, event))
1007 trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
1008 }
1009
1010 /* Event entry printers */
1011 enum print_line_t
1012 print_kprobe_event(struct trace_iterator *iter, int flags)
1013 {
1014 struct kprobe_trace_entry *field;
1015 struct trace_seq *s = &iter->seq;
1016 struct trace_event *event;
1017 struct trace_probe *tp;
1018 int i;
1019
1020 field = (struct kprobe_trace_entry *)iter->ent;
1021 event = ftrace_find_event(field->ent.type);
1022 tp = container_of(event, struct trace_probe, event);
1023
1024 if (!trace_seq_printf(s, "%s: (", tp->call.name))
1025 goto partial;
1026
1027 if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET))
1028 goto partial;
1029
1030 if (!trace_seq_puts(s, ")"))
1031 goto partial;
1032
1033 for (i = 0; i < field->nargs; i++)
1034 if (!trace_seq_printf(s, " %s=%lx",
1035 tp->args[i].name, field->args[i]))
1036 goto partial;
1037
1038 if (!trace_seq_puts(s, "\n"))
1039 goto partial;
1040
1041 return TRACE_TYPE_HANDLED;
1042 partial:
1043 return TRACE_TYPE_PARTIAL_LINE;
1044 }
1045
1046 enum print_line_t
1047 print_kretprobe_event(struct trace_iterator *iter, int flags)
1048 {
1049 struct kretprobe_trace_entry *field;
1050 struct trace_seq *s = &iter->seq;
1051 struct trace_event *event;
1052 struct trace_probe *tp;
1053 int i;
1054
1055 field = (struct kretprobe_trace_entry *)iter->ent;
1056 event = ftrace_find_event(field->ent.type);
1057 tp = container_of(event, struct trace_probe, event);
1058
1059 if (!trace_seq_printf(s, "%s: (", tp->call.name))
1060 goto partial;
1061
1062 if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET))
1063 goto partial;
1064
1065 if (!trace_seq_puts(s, " <- "))
1066 goto partial;
1067
1068 if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET))
1069 goto partial;
1070
1071 if (!trace_seq_puts(s, ")"))
1072 goto partial;
1073
1074 for (i = 0; i < field->nargs; i++)
1075 if (!trace_seq_printf(s, " %s=%lx",
1076 tp->args[i].name, field->args[i]))
1077 goto partial;
1078
1079 if (!trace_seq_puts(s, "\n"))
1080 goto partial;
1081
1082 return TRACE_TYPE_HANDLED;
1083 partial:
1084 return TRACE_TYPE_PARTIAL_LINE;
1085 }
1086
1087 static int probe_event_enable(struct ftrace_event_call *call)
1088 {
1089 struct trace_probe *tp = (struct trace_probe *)call->data;
1090
1091 tp->flags |= TP_FLAG_TRACE;
1092 if (probe_is_return(tp))
1093 return enable_kretprobe(&tp->rp);
1094 else
1095 return enable_kprobe(&tp->rp.kp);
1096 }
1097
1098 static void probe_event_disable(struct ftrace_event_call *call)
1099 {
1100 struct trace_probe *tp = (struct trace_probe *)call->data;
1101
1102 tp->flags &= ~TP_FLAG_TRACE;
1103 if (!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE))) {
1104 if (probe_is_return(tp))
1105 disable_kretprobe(&tp->rp);
1106 else
1107 disable_kprobe(&tp->rp.kp);
1108 }
1109 }
1110
1111 static int probe_event_raw_init(struct ftrace_event_call *event_call)
1112 {
1113 INIT_LIST_HEAD(&event_call->fields);
1114
1115 return 0;
1116 }
1117
1118 #undef DEFINE_FIELD
1119 #define DEFINE_FIELD(type, item, name, is_signed) \
1120 do { \
1121 ret = trace_define_field(event_call, #type, name, \
1122 offsetof(typeof(field), item), \
1123 sizeof(field.item), is_signed, \
1124 FILTER_OTHER); \
1125 if (ret) \
1126 return ret; \
1127 } while (0)
1128
1129 static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
1130 {
1131 int ret, i;
1132 struct kprobe_trace_entry field;
1133 struct trace_probe *tp = (struct trace_probe *)event_call->data;
1134
1135 DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0);
1136 DEFINE_FIELD(int, nargs, FIELD_STRING_NARGS, 1);
1137 /* Set argument names as fields */
1138 for (i = 0; i < tp->nr_args; i++)
1139 DEFINE_FIELD(unsigned long, args[i], tp->args[i].name, 0);
1140 return 0;
1141 }
1142
1143 static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
1144 {
1145 int ret, i;
1146 struct kretprobe_trace_entry field;
1147 struct trace_probe *tp = (struct trace_probe *)event_call->data;
1148
1149 DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0);
1150 DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0);
1151 DEFINE_FIELD(int, nargs, FIELD_STRING_NARGS, 1);
1152 /* Set argument names as fields */
1153 for (i = 0; i < tp->nr_args; i++)
1154 DEFINE_FIELD(unsigned long, args[i], tp->args[i].name, 0);
1155 return 0;
1156 }
1157
1158 static int __set_print_fmt(struct trace_probe *tp, char *buf, int len)
1159 {
1160 int i;
1161 int pos = 0;
1162
1163 const char *fmt, *arg;
1164
1165 if (!probe_is_return(tp)) {
1166 fmt = "(%lx)";
1167 arg = "REC->" FIELD_STRING_IP;
1168 } else {
1169 fmt = "(%lx <- %lx)";
1170 arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
1171 }
1172
1173 /* When len=0, we just calculate the needed length */
1174 #define LEN_OR_ZERO (len ? len - pos : 0)
1175
1176 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
1177
1178 for (i = 0; i < tp->nr_args; i++) {
1179 pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%%lx",
1180 tp->args[i].name);
1181 }
1182
1183 pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
1184
1185 for (i = 0; i < tp->nr_args; i++) {
1186 pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
1187 tp->args[i].name);
1188 }
1189
1190 #undef LEN_OR_ZERO
1191
1192 /* return the length of print_fmt */
1193 return pos;
1194 }
1195
1196 static int set_print_fmt(struct trace_probe *tp)
1197 {
1198 int len;
1199 char *print_fmt;
1200
1201 /* First: called with 0 length to calculate the needed length */
1202 len = __set_print_fmt(tp, NULL, 0);
1203 print_fmt = kmalloc(len + 1, GFP_KERNEL);
1204 if (!print_fmt)
1205 return -ENOMEM;
1206
1207 /* Second: actually write the @print_fmt */
1208 __set_print_fmt(tp, print_fmt, len + 1);
1209 tp->call.print_fmt = print_fmt;
1210
1211 return 0;
1212 }
1213
1214 #ifdef CONFIG_PERF_EVENTS
1215
1216 /* Kprobe profile handler */
1217 static __kprobes void kprobe_perf_func(struct kprobe *kp,
1218 struct pt_regs *regs)
1219 {
1220 struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
1221 struct ftrace_event_call *call = &tp->call;
1222 struct kprobe_trace_entry *entry;
1223 int size, __size, i;
1224 unsigned long irq_flags;
1225 int rctx;
1226
1227 __size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args);
1228 size = ALIGN(__size + sizeof(u32), sizeof(u64));
1229 size -= sizeof(u32);
1230 if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
1231 "profile buffer not large enough"))
1232 return;
1233
1234 entry = perf_trace_buf_prepare(size, call->id, &rctx, &irq_flags);
1235 if (!entry)
1236 return;
1237
1238 entry->nargs = tp->nr_args;
1239 entry->ip = (unsigned long)kp->addr;
1240 for (i = 0; i < tp->nr_args; i++)
1241 entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
1242
1243 perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, irq_flags, regs);
1244 }
1245
1246 /* Kretprobe profile handler */
1247 static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
1248 struct pt_regs *regs)
1249 {
1250 struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
1251 struct ftrace_event_call *call = &tp->call;
1252 struct kretprobe_trace_entry *entry;
1253 int size, __size, i;
1254 unsigned long irq_flags;
1255 int rctx;
1256
1257 __size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args);
1258 size = ALIGN(__size + sizeof(u32), sizeof(u64));
1259 size -= sizeof(u32);
1260 if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
1261 "profile buffer not large enough"))
1262 return;
1263
1264 entry = perf_trace_buf_prepare(size, call->id, &rctx, &irq_flags);
1265 if (!entry)
1266 return;
1267
1268 entry->nargs = tp->nr_args;
1269 entry->func = (unsigned long)tp->rp.kp.addr;
1270 entry->ret_ip = (unsigned long)ri->ret_addr;
1271 for (i = 0; i < tp->nr_args; i++)
1272 entry->args[i] = call_fetch(&tp->args[i].fetch, regs);
1273
1274 perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1,
1275 irq_flags, regs);
1276 }
1277
1278 static int probe_perf_enable(struct ftrace_event_call *call)
1279 {
1280 struct trace_probe *tp = (struct trace_probe *)call->data;
1281
1282 tp->flags |= TP_FLAG_PROFILE;
1283
1284 if (probe_is_return(tp))
1285 return enable_kretprobe(&tp->rp);
1286 else
1287 return enable_kprobe(&tp->rp.kp);
1288 }
1289
1290 static void probe_perf_disable(struct ftrace_event_call *call)
1291 {
1292 struct trace_probe *tp = (struct trace_probe *)call->data;
1293
1294 tp->flags &= ~TP_FLAG_PROFILE;
1295
1296 if (!(tp->flags & TP_FLAG_TRACE)) {
1297 if (probe_is_return(tp))
1298 disable_kretprobe(&tp->rp);
1299 else
1300 disable_kprobe(&tp->rp.kp);
1301 }
1302 }
1303 #endif /* CONFIG_PERF_EVENTS */
1304
1305
1306 static __kprobes
1307 int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs)
1308 {
1309 struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp);
1310
1311 if (tp->flags & TP_FLAG_TRACE)
1312 kprobe_trace_func(kp, regs);
1313 #ifdef CONFIG_PERF_EVENTS
1314 if (tp->flags & TP_FLAG_PROFILE)
1315 kprobe_perf_func(kp, regs);
1316 #endif
1317 return 0; /* We don't tweek kernel, so just return 0 */
1318 }
1319
1320 static __kprobes
1321 int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs)
1322 {
1323 struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp);
1324
1325 if (tp->flags & TP_FLAG_TRACE)
1326 kretprobe_trace_func(ri, regs);
1327 #ifdef CONFIG_PERF_EVENTS
1328 if (tp->flags & TP_FLAG_PROFILE)
1329 kretprobe_perf_func(ri, regs);
1330 #endif
1331 return 0; /* We don't tweek kernel, so just return 0 */
1332 }
1333
1334 static int register_probe_event(struct trace_probe *tp)
1335 {
1336 struct ftrace_event_call *call = &tp->call;
1337 int ret;
1338
1339 /* Initialize ftrace_event_call */
1340 if (probe_is_return(tp)) {
1341 tp->event.trace = print_kretprobe_event;
1342 call->raw_init = probe_event_raw_init;
1343 call->define_fields = kretprobe_event_define_fields;
1344 } else {
1345 tp->event.trace = print_kprobe_event;
1346 call->raw_init = probe_event_raw_init;
1347 call->define_fields = kprobe_event_define_fields;
1348 }
1349 if (set_print_fmt(tp) < 0)
1350 return -ENOMEM;
1351 call->event = &tp->event;
1352 call->id = register_ftrace_event(&tp->event);
1353 if (!call->id) {
1354 kfree(call->print_fmt);
1355 return -ENODEV;
1356 }
1357 call->enabled = 0;
1358 call->regfunc = probe_event_enable;
1359 call->unregfunc = probe_event_disable;
1360
1361 #ifdef CONFIG_PERF_EVENTS
1362 call->perf_event_enable = probe_perf_enable;
1363 call->perf_event_disable = probe_perf_disable;
1364 #endif
1365 call->data = tp;
1366 ret = trace_add_event_call(call);
1367 if (ret) {
1368 pr_info("Failed to register kprobe event: %s\n", call->name);
1369 kfree(call->print_fmt);
1370 unregister_ftrace_event(&tp->event);
1371 }
1372 return ret;
1373 }
1374
1375 static void unregister_probe_event(struct trace_probe *tp)
1376 {
1377 /* tp->event is unregistered in trace_remove_event_call() */
1378 trace_remove_event_call(&tp->call);
1379 kfree(tp->call.print_fmt);
1380 }
1381
1382 /* Make a debugfs interface for controling probe points */
1383 static __init int init_kprobe_trace(void)
1384 {
1385 struct dentry *d_tracer;
1386 struct dentry *entry;
1387
1388 d_tracer = tracing_init_dentry();
1389 if (!d_tracer)
1390 return 0;
1391
1392 entry = debugfs_create_file("kprobe_events", 0644, d_tracer,
1393 NULL, &kprobe_events_ops);
1394
1395 /* Event list interface */
1396 if (!entry)
1397 pr_warning("Could not create debugfs "
1398 "'kprobe_events' entry\n");
1399
1400 /* Profile interface */
1401 entry = debugfs_create_file("kprobe_profile", 0444, d_tracer,
1402 NULL, &kprobe_profile_ops);
1403
1404 if (!entry)
1405 pr_warning("Could not create debugfs "
1406 "'kprobe_profile' entry\n");
1407 return 0;
1408 }
1409 fs_initcall(init_kprobe_trace);
1410
1411
1412 #ifdef CONFIG_FTRACE_STARTUP_TEST
1413
1414 static int kprobe_trace_selftest_target(int a1, int a2, int a3,
1415 int a4, int a5, int a6)
1416 {
1417 return a1 + a2 + a3 + a4 + a5 + a6;
1418 }
1419
1420 static __init int kprobe_trace_self_tests_init(void)
1421 {
1422 int ret, warn = 0;
1423 int (*target)(int, int, int, int, int, int);
1424 struct trace_probe *tp;
1425
1426 target = kprobe_trace_selftest_target;
1427
1428 pr_info("Testing kprobe tracing: ");
1429
1430 ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target "
1431 "$stack $stack0 +0($stack)");
1432 if (WARN_ON_ONCE(ret)) {
1433 pr_warning("error on probing function entry.\n");
1434 warn++;
1435 } else {
1436 /* Enable trace point */
1437 tp = find_probe_event("testprobe", KPROBE_EVENT_SYSTEM);
1438 if (WARN_ON_ONCE(tp == NULL)) {
1439 pr_warning("error on getting new probe.\n");
1440 warn++;
1441 } else
1442 probe_event_enable(&tp->call);
1443 }
1444
1445 ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target "
1446 "$retval");
1447 if (WARN_ON_ONCE(ret)) {
1448 pr_warning("error on probing function return.\n");
1449 warn++;
1450 } else {
1451 /* Enable trace point */
1452 tp = find_probe_event("testprobe2", KPROBE_EVENT_SYSTEM);
1453 if (WARN_ON_ONCE(tp == NULL)) {
1454 pr_warning("error on getting new probe.\n");
1455 warn++;
1456 } else
1457 probe_event_enable(&tp->call);
1458 }
1459
1460 if (warn)
1461 goto end;
1462
1463 ret = target(1, 2, 3, 4, 5, 6);
1464
1465 ret = command_trace_probe("-:testprobe");
1466 if (WARN_ON_ONCE(ret)) {
1467 pr_warning("error on deleting a probe.\n");
1468 warn++;
1469 }
1470
1471 ret = command_trace_probe("-:testprobe2");
1472 if (WARN_ON_ONCE(ret)) {
1473 pr_warning("error on deleting a probe.\n");
1474 warn++;
1475 }
1476
1477 end:
1478 cleanup_all_probes();
1479 if (warn)
1480 pr_cont("NG: Some tests are failed. Please check them.\n");
1481 else
1482 pr_cont("OK\n");
1483 return 0;
1484 }
1485
1486 late_initcall(kprobe_trace_self_tests_init);
1487
1488 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree