2 * uprobes-based tracing events
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 * Copyright (C) IBM Corporation, 2010-2012
18 * Author: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
21 #include <linux/module.h>
22 #include <linux/uaccess.h>
23 #include <linux/uprobes.h>
24 #include <linux/namei.h>
25 #include <linux/string.h>
27 #include "trace_probe.h"
29 #define UPROBE_EVENT_SYSTEM "uprobes"
31 struct uprobe_trace_entry_head {
32 struct trace_entry ent;
33 unsigned long vaddr[];
36 #define SIZEOF_TRACE_ENTRY(is_return) \
37 (sizeof(struct uprobe_trace_entry_head) + \
38 sizeof(unsigned long) * (is_return ? 2 : 1))
40 #define DATAOF_TRACE_ENTRY(entry, is_return) \
41 ((void*)(entry) + SIZEOF_TRACE_ENTRY(is_return))
43 struct trace_uprobe_filter {
46 struct list_head perf_events;
50 * uprobe event core functions
53 struct list_head list;
54 struct ftrace_event_class class;
55 struct ftrace_event_call call;
56 struct trace_uprobe_filter filter;
57 struct uprobe_consumer consumer;
62 unsigned int flags; /* For TP_FLAG_* */
63 ssize_t size; /* trace entry size */
65 struct probe_arg args[];
68 #define SIZEOF_TRACE_UPROBE(n) \
69 (offsetof(struct trace_uprobe, args) + \
70 (sizeof(struct probe_arg) * (n)))
72 static int register_uprobe_event(struct trace_uprobe *tu);
73 static int unregister_uprobe_event(struct trace_uprobe *tu);
75 static DEFINE_MUTEX(uprobe_lock);
76 static LIST_HEAD(uprobe_list);
78 static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs);
79 static int uretprobe_dispatcher(struct uprobe_consumer *con,
80 unsigned long func, struct pt_regs *regs);
82 static inline void init_trace_uprobe_filter(struct trace_uprobe_filter *filter)
84 rwlock_init(&filter->rwlock);
85 filter->nr_systemwide = 0;
86 INIT_LIST_HEAD(&filter->perf_events);
89 static inline bool uprobe_filter_is_empty(struct trace_uprobe_filter *filter)
91 return !filter->nr_systemwide && list_empty(&filter->perf_events);
94 static inline bool is_ret_probe(struct trace_uprobe *tu)
96 return tu->consumer.ret_handler != NULL;
100 * Allocate new trace_uprobe and initialize it (including uprobes).
102 static struct trace_uprobe *
103 alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
105 struct trace_uprobe *tu;
107 if (!event || !is_good_name(event))
108 return ERR_PTR(-EINVAL);
110 if (!group || !is_good_name(group))
111 return ERR_PTR(-EINVAL);
113 tu = kzalloc(SIZEOF_TRACE_UPROBE(nargs), GFP_KERNEL);
115 return ERR_PTR(-ENOMEM);
117 tu->call.class = &tu->class;
118 tu->call.name = kstrdup(event, GFP_KERNEL);
122 tu->class.system = kstrdup(group, GFP_KERNEL);
123 if (!tu->class.system)
126 INIT_LIST_HEAD(&tu->list);
127 tu->consumer.handler = uprobe_dispatcher;
129 tu->consumer.ret_handler = uretprobe_dispatcher;
130 init_trace_uprobe_filter(&tu->filter);
131 tu->call.flags |= TRACE_EVENT_FL_USE_CALL_FILTER;
135 kfree(tu->call.name);
138 return ERR_PTR(-ENOMEM);
141 static void free_trace_uprobe(struct trace_uprobe *tu)
145 for (i = 0; i < tu->nr_args; i++)
146 traceprobe_free_probe_arg(&tu->args[i]);
149 kfree(tu->call.class->system);
150 kfree(tu->call.name);
155 static struct trace_uprobe *find_probe_event(const char *event, const char *group)
157 struct trace_uprobe *tu;
159 list_for_each_entry(tu, &uprobe_list, list)
160 if (strcmp(tu->call.name, event) == 0 &&
161 strcmp(tu->call.class->system, group) == 0)
167 /* Unregister a trace_uprobe and probe_event: call with locking uprobe_lock */
168 static int unregister_trace_uprobe(struct trace_uprobe *tu)
172 ret = unregister_uprobe_event(tu);
177 free_trace_uprobe(tu);
181 /* Register a trace_uprobe and probe_event */
182 static int register_trace_uprobe(struct trace_uprobe *tu)
184 struct trace_uprobe *old_tp;
187 mutex_lock(&uprobe_lock);
189 /* register as an event */
190 old_tp = find_probe_event(tu->call.name, tu->call.class->system);
192 /* delete old event */
193 ret = unregister_trace_uprobe(old_tp);
198 ret = register_uprobe_event(tu);
200 pr_warning("Failed to register probe event(%d)\n", ret);
204 list_add_tail(&tu->list, &uprobe_list);
207 mutex_unlock(&uprobe_lock);
214 * - Add uprobe: p|r[:[GRP/]EVENT] PATH:SYMBOL [FETCHARGS]
216 * - Remove uprobe: -:[GRP/]EVENT
218 static int create_trace_uprobe(int argc, char **argv)
220 struct trace_uprobe *tu;
222 char *arg, *event, *group, *filename;
223 char buf[MAX_EVENT_NAME_LEN];
225 unsigned long offset;
226 bool is_delete, is_return;
236 /* argc must be >= 1 */
237 if (argv[0][0] == '-')
239 else if (argv[0][0] == 'r')
241 else if (argv[0][0] != 'p') {
242 pr_info("Probe definition must be started with 'p', 'r' or '-'.\n");
246 if (argv[0][1] == ':') {
248 arg = strchr(event, '/');
255 if (strlen(group) == 0) {
256 pr_info("Group name is not specified\n");
260 if (strlen(event) == 0) {
261 pr_info("Event name is not specified\n");
266 group = UPROBE_EVENT_SYSTEM;
272 pr_info("Delete command needs an event name.\n");
275 mutex_lock(&uprobe_lock);
276 tu = find_probe_event(event, group);
279 mutex_unlock(&uprobe_lock);
280 pr_info("Event %s/%s doesn't exist.\n", group, event);
283 /* delete an event */
284 ret = unregister_trace_uprobe(tu);
285 mutex_unlock(&uprobe_lock);
290 pr_info("Probe point is not specified.\n");
293 if (isdigit(argv[1][0])) {
294 pr_info("probe point must be have a filename.\n");
297 arg = strchr(argv[1], ':');
300 goto fail_address_parse;
305 ret = kern_path(filename, LOOKUP_FOLLOW, &path);
307 goto fail_address_parse;
309 inode = igrab(path.dentry->d_inode);
312 if (!inode || !S_ISREG(inode->i_mode)) {
314 goto fail_address_parse;
317 ret = kstrtoul(arg, 0, &offset);
319 goto fail_address_parse;
329 tail = kstrdup(kbasename(filename), GFP_KERNEL);
332 goto fail_address_parse;
335 ptr = strpbrk(tail, ".-_");
339 snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_0x%lx", 'p', tail, offset);
344 tu = alloc_trace_uprobe(group, event, argc, is_return);
346 pr_info("Failed to allocate trace_uprobe.(%d)\n", (int)PTR_ERR(tu));
348 goto fail_address_parse;
352 tu->filename = kstrdup(filename, GFP_KERNEL);
355 pr_info("Failed to allocate filename.\n");
360 /* parse arguments */
362 for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
363 /* Increment count for freeing args in error case */
366 /* Parse argument name */
367 arg = strchr(argv[i], '=');
370 tu->args[i].name = kstrdup(argv[i], GFP_KERNEL);
373 /* If argument name is omitted, set "argN" */
374 snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
375 tu->args[i].name = kstrdup(buf, GFP_KERNEL);
378 if (!tu->args[i].name) {
379 pr_info("Failed to allocate argument[%d] name.\n", i);
384 if (!is_good_name(tu->args[i].name)) {
385 pr_info("Invalid argument[%d] name: %s\n", i, tu->args[i].name);
390 if (traceprobe_conflict_field_name(tu->args[i].name, tu->args, i)) {
391 pr_info("Argument[%d] name '%s' conflicts with "
392 "another field.\n", i, argv[i]);
397 /* Parse fetch argument */
398 ret = traceprobe_parse_probe_arg(arg, &tu->size, &tu->args[i], false, false);
400 pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
405 ret = register_trace_uprobe(tu);
411 free_trace_uprobe(tu);
418 pr_info("Failed to parse address or file.\n");
423 static int cleanup_all_probes(void)
425 struct trace_uprobe *tu;
428 mutex_lock(&uprobe_lock);
429 while (!list_empty(&uprobe_list)) {
430 tu = list_entry(uprobe_list.next, struct trace_uprobe, list);
431 ret = unregister_trace_uprobe(tu);
435 mutex_unlock(&uprobe_lock);
439 /* Probes listing interfaces */
440 static void *probes_seq_start(struct seq_file *m, loff_t *pos)
442 mutex_lock(&uprobe_lock);
443 return seq_list_start(&uprobe_list, *pos);
446 static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos)
448 return seq_list_next(v, &uprobe_list, pos);
451 static void probes_seq_stop(struct seq_file *m, void *v)
453 mutex_unlock(&uprobe_lock);
456 static int probes_seq_show(struct seq_file *m, void *v)
458 struct trace_uprobe *tu = v;
459 char c = is_ret_probe(tu) ? 'r' : 'p';
462 seq_printf(m, "%c:%s/%s", c, tu->call.class->system, tu->call.name);
463 seq_printf(m, " %s:0x%p", tu->filename, (void *)tu->offset);
465 for (i = 0; i < tu->nr_args; i++)
466 seq_printf(m, " %s=%s", tu->args[i].name, tu->args[i].comm);
472 static const struct seq_operations probes_seq_op = {
473 .start = probes_seq_start,
474 .next = probes_seq_next,
475 .stop = probes_seq_stop,
476 .show = probes_seq_show
479 static int probes_open(struct inode *inode, struct file *file)
483 if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
484 ret = cleanup_all_probes();
489 return seq_open(file, &probes_seq_op);
492 static ssize_t probes_write(struct file *file, const char __user *buffer,
493 size_t count, loff_t *ppos)
495 return traceprobe_probes_write(file, buffer, count, ppos, create_trace_uprobe);
498 static const struct file_operations uprobe_events_ops = {
499 .owner = THIS_MODULE,
503 .release = seq_release,
504 .write = probes_write,
507 /* Probes profiling interfaces */
508 static int probes_profile_seq_show(struct seq_file *m, void *v)
510 struct trace_uprobe *tu = v;
512 seq_printf(m, " %s %-44s %15lu\n", tu->filename, tu->call.name, tu->nhit);
516 static const struct seq_operations profile_seq_op = {
517 .start = probes_seq_start,
518 .next = probes_seq_next,
519 .stop = probes_seq_stop,
520 .show = probes_profile_seq_show
523 static int profile_open(struct inode *inode, struct file *file)
525 return seq_open(file, &profile_seq_op);
528 static const struct file_operations uprobe_profile_ops = {
529 .owner = THIS_MODULE,
530 .open = profile_open,
533 .release = seq_release,
536 static void uprobe_trace_print(struct trace_uprobe *tu,
537 unsigned long func, struct pt_regs *regs)
539 struct uprobe_trace_entry_head *entry;
540 struct ring_buffer_event *event;
541 struct ring_buffer *buffer;
544 struct ftrace_event_call *call = &tu->call;
546 size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
547 event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
548 size + tu->size, 0, 0);
552 entry = ring_buffer_event_data(event);
553 if (is_ret_probe(tu)) {
554 entry->vaddr[0] = func;
555 entry->vaddr[1] = instruction_pointer(regs);
556 data = DATAOF_TRACE_ENTRY(entry, true);
558 entry->vaddr[0] = instruction_pointer(regs);
559 data = DATAOF_TRACE_ENTRY(entry, false);
562 for (i = 0; i < tu->nr_args; i++)
563 call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
565 if (!call_filter_check_discard(call, entry, buffer, event))
566 trace_buffer_unlock_commit(buffer, event, 0, 0);
570 static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
572 if (!is_ret_probe(tu))
573 uprobe_trace_print(tu, 0, regs);
577 static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func,
578 struct pt_regs *regs)
580 uprobe_trace_print(tu, func, regs);
583 /* Event entry printers */
584 static enum print_line_t
585 print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *event)
587 struct uprobe_trace_entry_head *entry;
588 struct trace_seq *s = &iter->seq;
589 struct trace_uprobe *tu;
593 entry = (struct uprobe_trace_entry_head *)iter->ent;
594 tu = container_of(event, struct trace_uprobe, call.event);
596 if (is_ret_probe(tu)) {
597 if (!trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)", tu->call.name,
598 entry->vaddr[1], entry->vaddr[0]))
600 data = DATAOF_TRACE_ENTRY(entry, true);
602 if (!trace_seq_printf(s, "%s: (0x%lx)", tu->call.name,
605 data = DATAOF_TRACE_ENTRY(entry, false);
608 for (i = 0; i < tu->nr_args; i++) {
609 if (!tu->args[i].type->print(s, tu->args[i].name,
610 data + tu->args[i].offset, entry))
614 if (trace_seq_puts(s, "\n"))
615 return TRACE_TYPE_HANDLED;
618 return TRACE_TYPE_PARTIAL_LINE;
621 static inline bool is_trace_uprobe_enabled(struct trace_uprobe *tu)
623 return tu->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE);
626 typedef bool (*filter_func_t)(struct uprobe_consumer *self,
627 enum uprobe_filter_ctx ctx,
628 struct mm_struct *mm);
631 probe_event_enable(struct trace_uprobe *tu, int flag, filter_func_t filter)
635 if (is_trace_uprobe_enabled(tu))
638 WARN_ON(!uprobe_filter_is_empty(&tu->filter));
641 tu->consumer.filter = filter;
642 ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
649 static void probe_event_disable(struct trace_uprobe *tu, int flag)
651 if (!is_trace_uprobe_enabled(tu))
654 WARN_ON(!uprobe_filter_is_empty(&tu->filter));
656 uprobe_unregister(tu->inode, tu->offset, &tu->consumer);
660 static int uprobe_event_define_fields(struct ftrace_event_call *event_call)
663 struct uprobe_trace_entry_head field;
664 struct trace_uprobe *tu = event_call->data;
666 if (is_ret_probe(tu)) {
667 DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_FUNC, 0);
668 DEFINE_FIELD(unsigned long, vaddr[1], FIELD_STRING_RETIP, 0);
669 size = SIZEOF_TRACE_ENTRY(true);
671 DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_IP, 0);
672 size = SIZEOF_TRACE_ENTRY(false);
674 /* Set argument names as fields */
675 for (i = 0; i < tu->nr_args; i++) {
676 ret = trace_define_field(event_call, tu->args[i].type->fmttype,
678 size + tu->args[i].offset,
679 tu->args[i].type->size,
680 tu->args[i].type->is_signed,
689 #define LEN_OR_ZERO (len ? len - pos : 0)
690 static int __set_print_fmt(struct trace_uprobe *tu, char *buf, int len)
692 const char *fmt, *arg;
696 if (is_ret_probe(tu)) {
697 fmt = "(%lx <- %lx)";
698 arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP;
701 arg = "REC->" FIELD_STRING_IP;
704 /* When len=0, we just calculate the needed length */
706 pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt);
708 for (i = 0; i < tu->nr_args; i++) {
709 pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s",
710 tu->args[i].name, tu->args[i].type->fmt);
713 pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
715 for (i = 0; i < tu->nr_args; i++) {
716 pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
720 return pos; /* return the length of print_fmt */
724 static int set_print_fmt(struct trace_uprobe *tu)
729 /* First: called with 0 length to calculate the needed length */
730 len = __set_print_fmt(tu, NULL, 0);
731 print_fmt = kmalloc(len + 1, GFP_KERNEL);
735 /* Second: actually write the @print_fmt */
736 __set_print_fmt(tu, print_fmt, len + 1);
737 tu->call.print_fmt = print_fmt;
742 #ifdef CONFIG_PERF_EVENTS
744 __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm)
746 struct perf_event *event;
748 if (filter->nr_systemwide)
751 list_for_each_entry(event, &filter->perf_events, hw.tp_list) {
752 if (event->hw.tp_target->mm == mm)
760 uprobe_filter_event(struct trace_uprobe *tu, struct perf_event *event)
762 return __uprobe_perf_filter(&tu->filter, event->hw.tp_target->mm);
765 static int uprobe_perf_open(struct trace_uprobe *tu, struct perf_event *event)
769 write_lock(&tu->filter.rwlock);
770 if (event->hw.tp_target) {
772 * event->parent != NULL means copy_process(), we can avoid
773 * uprobe_apply(). current->mm must be probed and we can rely
774 * on dup_mmap() which preserves the already installed bp's.
776 * attr.enable_on_exec means that exec/mmap will install the
777 * breakpoints we need.
779 done = tu->filter.nr_systemwide ||
780 event->parent || event->attr.enable_on_exec ||
781 uprobe_filter_event(tu, event);
782 list_add(&event->hw.tp_list, &tu->filter.perf_events);
784 done = tu->filter.nr_systemwide;
785 tu->filter.nr_systemwide++;
787 write_unlock(&tu->filter.rwlock);
790 uprobe_apply(tu->inode, tu->offset, &tu->consumer, true);
795 static int uprobe_perf_close(struct trace_uprobe *tu, struct perf_event *event)
799 write_lock(&tu->filter.rwlock);
800 if (event->hw.tp_target) {
801 list_del(&event->hw.tp_list);
802 done = tu->filter.nr_systemwide ||
803 (event->hw.tp_target->flags & PF_EXITING) ||
804 uprobe_filter_event(tu, event);
806 tu->filter.nr_systemwide--;
807 done = tu->filter.nr_systemwide;
809 write_unlock(&tu->filter.rwlock);
812 uprobe_apply(tu->inode, tu->offset, &tu->consumer, false);
817 static bool uprobe_perf_filter(struct uprobe_consumer *uc,
818 enum uprobe_filter_ctx ctx, struct mm_struct *mm)
820 struct trace_uprobe *tu;
823 tu = container_of(uc, struct trace_uprobe, consumer);
824 read_lock(&tu->filter.rwlock);
825 ret = __uprobe_perf_filter(&tu->filter, mm);
826 read_unlock(&tu->filter.rwlock);
831 static void uprobe_perf_print(struct trace_uprobe *tu,
832 unsigned long func, struct pt_regs *regs)
834 struct ftrace_event_call *call = &tu->call;
835 struct uprobe_trace_entry_head *entry;
836 struct hlist_head *head;
840 size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
841 size = ALIGN(size + tu->size + sizeof(u32), sizeof(u64)) - sizeof(u32);
844 head = this_cpu_ptr(call->perf_events);
845 if (hlist_empty(head))
848 entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
852 if (is_ret_probe(tu)) {
853 entry->vaddr[0] = func;
854 entry->vaddr[1] = instruction_pointer(regs);
855 data = DATAOF_TRACE_ENTRY(entry, true);
857 entry->vaddr[0] = instruction_pointer(regs);
858 data = DATAOF_TRACE_ENTRY(entry, false);
861 for (i = 0; i < tu->nr_args; i++)
862 call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
864 perf_trace_buf_submit(entry, size, rctx, 0, 1, regs, head, NULL);
869 /* uprobe profile handler */
870 static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
872 if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
873 return UPROBE_HANDLER_REMOVE;
875 if (!is_ret_probe(tu))
876 uprobe_perf_print(tu, 0, regs);
880 static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func,
881 struct pt_regs *regs)
883 uprobe_perf_print(tu, func, regs);
885 #endif /* CONFIG_PERF_EVENTS */
888 int trace_uprobe_register(struct ftrace_event_call *event, enum trace_reg type, void *data)
890 struct trace_uprobe *tu = event->data;
893 case TRACE_REG_REGISTER:
894 return probe_event_enable(tu, TP_FLAG_TRACE, NULL);
896 case TRACE_REG_UNREGISTER:
897 probe_event_disable(tu, TP_FLAG_TRACE);
900 #ifdef CONFIG_PERF_EVENTS
901 case TRACE_REG_PERF_REGISTER:
902 return probe_event_enable(tu, TP_FLAG_PROFILE, uprobe_perf_filter);
904 case TRACE_REG_PERF_UNREGISTER:
905 probe_event_disable(tu, TP_FLAG_PROFILE);
908 case TRACE_REG_PERF_OPEN:
909 return uprobe_perf_open(tu, data);
911 case TRACE_REG_PERF_CLOSE:
912 return uprobe_perf_close(tu, data);
921 static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
923 struct trace_uprobe *tu;
926 tu = container_of(con, struct trace_uprobe, consumer);
929 if (tu->flags & TP_FLAG_TRACE)
930 ret |= uprobe_trace_func(tu, regs);
932 #ifdef CONFIG_PERF_EVENTS
933 if (tu->flags & TP_FLAG_PROFILE)
934 ret |= uprobe_perf_func(tu, regs);
939 static int uretprobe_dispatcher(struct uprobe_consumer *con,
940 unsigned long func, struct pt_regs *regs)
942 struct trace_uprobe *tu;
944 tu = container_of(con, struct trace_uprobe, consumer);
946 if (tu->flags & TP_FLAG_TRACE)
947 uretprobe_trace_func(tu, func, regs);
949 #ifdef CONFIG_PERF_EVENTS
950 if (tu->flags & TP_FLAG_PROFILE)
951 uretprobe_perf_func(tu, func, regs);
956 static struct trace_event_functions uprobe_funcs = {
957 .trace = print_uprobe_event
960 static int register_uprobe_event(struct trace_uprobe *tu)
962 struct ftrace_event_call *call = &tu->call;
965 /* Initialize ftrace_event_call */
966 INIT_LIST_HEAD(&call->class->fields);
967 call->event.funcs = &uprobe_funcs;
968 call->class->define_fields = uprobe_event_define_fields;
970 if (set_print_fmt(tu) < 0)
973 ret = register_ftrace_event(&call->event);
975 kfree(call->print_fmt);
979 call->class->reg = trace_uprobe_register;
981 ret = trace_add_event_call(call);
984 pr_info("Failed to register uprobe event: %s\n", call->name);
985 kfree(call->print_fmt);
986 unregister_ftrace_event(&call->event);
992 static int unregister_uprobe_event(struct trace_uprobe *tu)
996 /* tu->event is unregistered in trace_remove_event_call() */
997 ret = trace_remove_event_call(&tu->call);
1000 kfree(tu->call.print_fmt);
1001 tu->call.print_fmt = NULL;
1005 /* Make a trace interface for controling probe points */
1006 static __init int init_uprobe_trace(void)
1008 struct dentry *d_tracer;
1010 d_tracer = tracing_init_dentry();
1014 trace_create_file("uprobe_events", 0644, d_tracer,
1015 NULL, &uprobe_events_ops);
1016 /* Profile interface */
1017 trace_create_file("uprobe_profile", 0444, d_tracer,
1018 NULL, &uprobe_profile_ops);
1022 fs_initcall(init_uprobe_trace);