4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
6 * - Added format output of fields of the trace point.
7 * This was based off of work by Tom Zanussi <tzanussi@gmail.com>.
11 #include <linux/workqueue.h>
12 #include <linux/spinlock.h>
13 #include <linux/kthread.h>
14 #include <linux/debugfs.h>
15 #include <linux/uaccess.h>
16 #include <linux/module.h>
17 #include <linux/ctype.h>
18 #include <linux/delay.h>
20 #include "trace_output.h"
22 #define TRACE_SYSTEM "TRACE_SYSTEM"
24 DEFINE_MUTEX(event_mutex);
26 LIST_HEAD(ftrace_events);
28 int trace_define_field(struct ftrace_event_call *call, char *type,
29 char *name, int offset, int size, int is_signed)
31 struct ftrace_event_field *field;
33 field = kzalloc(sizeof(*field), GFP_KERNEL);
37 field->name = kstrdup(name, GFP_KERNEL);
41 field->type = kstrdup(type, GFP_KERNEL);
45 field->offset = offset;
47 field->is_signed = is_signed;
48 list_add(&field->link, &call->fields);
61 EXPORT_SYMBOL_GPL(trace_define_field);
65 static void trace_destroy_fields(struct ftrace_event_call *call)
67 struct ftrace_event_field *field, *next;
69 list_for_each_entry_safe(field, next, &call->fields, link) {
70 list_del(&field->link);
77 #endif /* CONFIG_MODULES */
79 static void ftrace_clear_events(void)
81 struct ftrace_event_call *call;
83 mutex_lock(&event_mutex);
84 list_for_each_entry(call, &ftrace_events, list) {
91 mutex_unlock(&event_mutex);
94 static void ftrace_event_enable_disable(struct ftrace_event_call *call,
106 if (!call->enabled) {
115 * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
117 static int __ftrace_set_clr_event(const char *match, const char *sub,
118 const char *event, int set)
120 struct ftrace_event_call *call;
123 mutex_lock(&event_mutex);
124 list_for_each_entry(call, &ftrace_events, list) {
126 if (!call->name || !call->regfunc)
130 strcmp(match, call->name) != 0 &&
131 strcmp(match, call->system) != 0)
134 if (sub && strcmp(sub, call->system) != 0)
137 if (event && strcmp(event, call->name) != 0)
140 ftrace_event_enable_disable(call, set);
144 mutex_unlock(&event_mutex);
149 static int ftrace_set_clr_event(char *buf, int set)
151 char *event = NULL, *sub = NULL, *match;
154 * The buf format can be <subsystem>:<event-name>
155 * *:<event-name> means any event by that name.
156 * :<event-name> is the same.
158 * <subsystem>:* means all events in that subsystem
159 * <subsystem>: means the same.
161 * <name> (no ':') means all events in a subsystem with
162 * the name <name> or any event that matches <name>
165 match = strsep(&buf, ":");
171 if (!strlen(sub) || strcmp(sub, "*") == 0)
173 if (!strlen(event) || strcmp(event, "*") == 0)
177 return __ftrace_set_clr_event(match, sub, event, set);
181 * trace_set_clr_event - enable or disable an event
182 * @system: system name to match (NULL for any system)
183 * @event: event name to match (NULL for all events, within system)
184 * @set: 1 to enable, 0 to disable
186 * This is a way for other parts of the kernel to enable or disable
189 * Returns 0 on success, -EINVAL if the parameters do not match any
192 int trace_set_clr_event(const char *system, const char *event, int set)
194 return __ftrace_set_clr_event(NULL, system, event, set);
197 /* 128 should be much more than enough */
198 #define EVENT_BUF_SIZE 127
201 ftrace_event_write(struct file *file, const char __user *ubuf,
202 size_t cnt, loff_t *ppos)
213 ret = tracing_update_buffers();
217 ret = get_user(ch, ubuf++);
223 /* skip white space */
224 while (cnt && isspace(ch)) {
225 ret = get_user(ch, ubuf++);
232 /* Only white space found? */
239 buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL);
243 if (cnt > EVENT_BUF_SIZE)
244 cnt = EVENT_BUF_SIZE;
247 while (cnt && !isspace(ch)) {
253 ret = get_user(ch, ubuf++);
263 ret = ftrace_set_clr_event(buf, set);
276 t_next(struct seq_file *m, void *v, loff_t *pos)
278 struct list_head *list = m->private;
279 struct ftrace_event_call *call;
284 if (list == &ftrace_events)
287 call = list_entry(list, struct ftrace_event_call, list);
290 * The ftrace subsystem is for showing formats only.
291 * They can not be enabled or disabled via the event files.
299 m->private = list->next;
304 static void *t_start(struct seq_file *m, loff_t *pos)
306 mutex_lock(&event_mutex);
308 m->private = ftrace_events.next;
309 return t_next(m, NULL, pos);
313 s_next(struct seq_file *m, void *v, loff_t *pos)
315 struct list_head *list = m->private;
316 struct ftrace_event_call *call;
321 if (list == &ftrace_events)
324 call = list_entry(list, struct ftrace_event_call, list);
326 if (!call->enabled) {
331 m->private = list->next;
336 static void *s_start(struct seq_file *m, loff_t *pos)
338 mutex_lock(&event_mutex);
340 m->private = ftrace_events.next;
341 return s_next(m, NULL, pos);
344 static int t_show(struct seq_file *m, void *v)
346 struct ftrace_event_call *call = v;
348 if (strcmp(call->system, TRACE_SYSTEM) != 0)
349 seq_printf(m, "%s:", call->system);
350 seq_printf(m, "%s\n", call->name);
355 static void t_stop(struct seq_file *m, void *p)
357 mutex_unlock(&event_mutex);
361 ftrace_event_seq_open(struct inode *inode, struct file *file)
363 const struct seq_operations *seq_ops;
365 if ((file->f_mode & FMODE_WRITE) &&
366 !(file->f_flags & O_APPEND))
367 ftrace_clear_events();
369 seq_ops = inode->i_private;
370 return seq_open(file, seq_ops);
374 event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
377 struct ftrace_event_call *call = filp->private_data;
385 return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
389 event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
392 struct ftrace_event_call *call = filp->private_data;
397 if (cnt >= sizeof(buf))
400 if (copy_from_user(&buf, ubuf, cnt))
405 ret = strict_strtoul(buf, 10, &val);
409 ret = tracing_update_buffers();
416 mutex_lock(&event_mutex);
417 ftrace_event_enable_disable(call, val);
418 mutex_unlock(&event_mutex);
431 system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
434 const char set_to_char[4] = { '?', '0', '1', 'X' };
435 const char *system = filp->private_data;
436 struct ftrace_event_call *call;
441 mutex_lock(&event_mutex);
442 list_for_each_entry(call, &ftrace_events, list) {
443 if (!call->name || !call->regfunc)
446 if (system && strcmp(call->system, system) != 0)
450 * We need to find out if all the events are set
451 * or if all events or cleared, or if we have
454 set |= (1 << !!call->enabled);
457 * If we have a mixture, no need to look further.
462 mutex_unlock(&event_mutex);
464 buf[0] = set_to_char[set];
467 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
473 system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
476 const char *system = filp->private_data;
481 if (cnt >= sizeof(buf))
484 if (copy_from_user(&buf, ubuf, cnt))
489 ret = strict_strtoul(buf, 10, &val);
493 ret = tracing_update_buffers();
497 if (val != 0 && val != 1)
500 ret = __ftrace_set_clr_event(NULL, system, NULL, val);
512 extern char *__bad_type_size(void);
515 #define FIELD(type, name) \
516 sizeof(type) != sizeof(field.name) ? __bad_type_size() : \
517 #type, "common_" #name, offsetof(typeof(field), name), \
520 static int trace_write_header(struct trace_seq *s)
522 struct trace_entry field;
524 /* struct trace_entry */
525 return trace_seq_printf(s,
526 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
527 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
528 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
529 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
530 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
532 FIELD(unsigned short, type),
533 FIELD(unsigned char, flags),
534 FIELD(unsigned char, preempt_count),
540 event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
543 struct ftrace_event_call *call = filp->private_data;
551 s = kmalloc(sizeof(*s), GFP_KERNEL);
557 /* If any of the first writes fail, so will the show_format. */
559 trace_seq_printf(s, "name: %s\n", call->name);
560 trace_seq_printf(s, "ID: %d\n", call->id);
561 trace_seq_printf(s, "format:\n");
562 trace_write_header(s);
564 r = call->show_format(s);
567 * ug! The format output is bigger than a PAGE!!
569 buf = "FORMAT TOO BIG\n";
570 r = simple_read_from_buffer(ubuf, cnt, ppos,
575 r = simple_read_from_buffer(ubuf, cnt, ppos,
583 event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
585 struct ftrace_event_call *call = filp->private_data;
592 s = kmalloc(sizeof(*s), GFP_KERNEL);
597 trace_seq_printf(s, "%d\n", call->id);
599 r = simple_read_from_buffer(ubuf, cnt, ppos,
606 event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
609 struct ftrace_event_call *call = filp->private_data;
616 s = kmalloc(sizeof(*s), GFP_KERNEL);
622 print_event_filter(call, s);
623 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
631 event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
634 struct ftrace_event_call *call = filp->private_data;
638 if (cnt >= PAGE_SIZE)
641 buf = (char *)__get_free_page(GFP_TEMPORARY);
645 if (copy_from_user(buf, ubuf, cnt)) {
646 free_page((unsigned long) buf);
651 err = apply_event_filter(call, buf);
652 free_page((unsigned long) buf);
662 subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
665 struct event_subsystem *system = filp->private_data;
672 s = kmalloc(sizeof(*s), GFP_KERNEL);
678 print_subsystem_event_filter(system, s);
679 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
687 subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
690 struct event_subsystem *system = filp->private_data;
694 if (cnt >= PAGE_SIZE)
697 buf = (char *)__get_free_page(GFP_TEMPORARY);
701 if (copy_from_user(buf, ubuf, cnt)) {
702 free_page((unsigned long) buf);
707 err = apply_subsystem_event_filter(system, buf);
708 free_page((unsigned long) buf);
718 show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
720 int (*func)(struct trace_seq *s) = filp->private_data;
727 s = kmalloc(sizeof(*s), GFP_KERNEL);
734 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
741 static const struct seq_operations show_event_seq_ops = {
748 static const struct seq_operations show_set_event_seq_ops = {
755 static const struct file_operations ftrace_avail_fops = {
756 .open = ftrace_event_seq_open,
759 .release = seq_release,
762 static const struct file_operations ftrace_set_event_fops = {
763 .open = ftrace_event_seq_open,
765 .write = ftrace_event_write,
767 .release = seq_release,
770 static const struct file_operations ftrace_enable_fops = {
771 .open = tracing_open_generic,
772 .read = event_enable_read,
773 .write = event_enable_write,
776 static const struct file_operations ftrace_event_format_fops = {
777 .open = tracing_open_generic,
778 .read = event_format_read,
781 static const struct file_operations ftrace_event_id_fops = {
782 .open = tracing_open_generic,
783 .read = event_id_read,
786 static const struct file_operations ftrace_event_filter_fops = {
787 .open = tracing_open_generic,
788 .read = event_filter_read,
789 .write = event_filter_write,
792 static const struct file_operations ftrace_subsystem_filter_fops = {
793 .open = tracing_open_generic,
794 .read = subsystem_filter_read,
795 .write = subsystem_filter_write,
798 static const struct file_operations ftrace_system_enable_fops = {
799 .open = tracing_open_generic,
800 .read = system_enable_read,
801 .write = system_enable_write,
804 static const struct file_operations ftrace_show_header_fops = {
805 .open = tracing_open_generic,
809 static struct dentry *event_trace_events_dir(void)
811 static struct dentry *d_tracer;
812 static struct dentry *d_events;
817 d_tracer = tracing_init_dentry();
821 d_events = debugfs_create_dir("events", d_tracer);
823 pr_warning("Could not create debugfs "
824 "'events' directory\n");
829 static LIST_HEAD(event_subsystems);
831 static struct dentry *
832 event_subsystem_dir(const char *name, struct dentry *d_events)
834 struct event_subsystem *system;
835 struct dentry *entry;
837 /* First see if we did not already create this dir */
838 list_for_each_entry(system, &event_subsystems, list) {
839 if (strcmp(system->name, name) == 0)
840 return system->entry;
843 /* need to create new entry */
844 system = kmalloc(sizeof(*system), GFP_KERNEL);
846 pr_warning("No memory to create event subsystem %s\n",
851 system->entry = debugfs_create_dir(name, d_events);
852 if (!system->entry) {
853 pr_warning("Could not create event subsystem %s\n",
859 system->name = kstrdup(name, GFP_KERNEL);
861 debugfs_remove(system->entry);
866 list_add(&system->list, &event_subsystems);
868 system->filter = NULL;
870 system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
871 if (!system->filter) {
872 pr_warning("Could not allocate filter for subsystem "
874 return system->entry;
877 entry = debugfs_create_file("filter", 0644, system->entry, system,
878 &ftrace_subsystem_filter_fops);
880 kfree(system->filter);
881 system->filter = NULL;
882 pr_warning("Could not create debugfs "
883 "'%s/filter' entry\n", name);
886 entry = trace_create_file("enable", 0644, system->entry,
887 (void *)system->name,
888 &ftrace_system_enable_fops);
890 return system->entry;
894 event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
895 const struct file_operations *id,
896 const struct file_operations *enable,
897 const struct file_operations *filter,
898 const struct file_operations *format)
900 struct dentry *entry;
904 * If the trace point header did not define TRACE_SYSTEM
905 * then the system would be called "TRACE_SYSTEM".
907 if (strcmp(call->system, TRACE_SYSTEM) != 0)
908 d_events = event_subsystem_dir(call->system, d_events);
910 if (call->raw_init) {
911 ret = call->raw_init();
913 pr_warning("Could not initialize trace point"
914 " events/%s\n", call->name);
919 call->dir = debugfs_create_dir(call->name, d_events);
921 pr_warning("Could not create debugfs "
922 "'%s' directory\n", call->name);
927 entry = trace_create_file("enable", 0644, call->dir, call,
931 entry = trace_create_file("id", 0444, call->dir, call,
934 if (call->define_fields) {
935 ret = call->define_fields();
937 pr_warning("Could not initialize trace point"
938 " events/%s\n", call->name);
941 entry = trace_create_file("filter", 0644, call->dir, call,
945 /* A trace may not want to export its format */
946 if (!call->show_format)
949 entry = trace_create_file("format", 0444, call->dir, call,
955 #define for_each_event(event, start, end) \
956 for (event = start; \
957 (unsigned long)event < (unsigned long)end; \
960 #ifdef CONFIG_MODULES
962 static LIST_HEAD(ftrace_module_file_list);
965 * Modules must own their file_operations to keep up with
966 * reference counting.
968 struct ftrace_module_file_ops {
969 struct list_head list;
971 struct file_operations id;
972 struct file_operations enable;
973 struct file_operations format;
974 struct file_operations filter;
977 static struct ftrace_module_file_ops *
978 trace_create_file_ops(struct module *mod)
980 struct ftrace_module_file_ops *file_ops;
983 * This is a bit of a PITA. To allow for correct reference
984 * counting, modules must "own" their file_operations.
985 * To do this, we allocate the file operations that will be
986 * used in the event directory.
989 file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
995 file_ops->id = ftrace_event_id_fops;
996 file_ops->id.owner = mod;
998 file_ops->enable = ftrace_enable_fops;
999 file_ops->enable.owner = mod;
1001 file_ops->filter = ftrace_event_filter_fops;
1002 file_ops->filter.owner = mod;
1004 file_ops->format = ftrace_event_format_fops;
1005 file_ops->format.owner = mod;
1007 list_add(&file_ops->list, &ftrace_module_file_list);
1012 static void trace_module_add_events(struct module *mod)
1014 struct ftrace_module_file_ops *file_ops = NULL;
1015 struct ftrace_event_call *call, *start, *end;
1016 struct dentry *d_events;
1018 start = mod->trace_events;
1019 end = mod->trace_events + mod->num_trace_events;
1024 d_events = event_trace_events_dir();
1028 for_each_event(call, start, end) {
1029 /* The linker may leave blanks */
1034 * This module has events, create file ops for this module
1035 * if not already done.
1038 file_ops = trace_create_file_ops(mod);
1043 list_add(&call->list, &ftrace_events);
1044 event_create_dir(call, d_events,
1045 &file_ops->id, &file_ops->enable,
1046 &file_ops->filter, &file_ops->format);
1050 static void trace_module_remove_events(struct module *mod)
1052 struct ftrace_module_file_ops *file_ops;
1053 struct ftrace_event_call *call, *p;
1056 list_for_each_entry_safe(call, p, &ftrace_events, list) {
1057 if (call->mod == mod) {
1059 if (call->enabled) {
1064 unregister_ftrace_event(call->event);
1065 debugfs_remove_recursive(call->dir);
1066 list_del(&call->list);
1067 trace_destroy_fields(call);
1068 destroy_preds(call);
1072 /* Now free the file_operations */
1073 list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
1074 if (file_ops->mod == mod)
1077 if (&file_ops->list != &ftrace_module_file_list) {
1078 list_del(&file_ops->list);
1083 * It is safest to reset the ring buffer if the module being unloaded
1084 * registered any events.
1087 tracing_reset_current_online_cpus();
1090 static int trace_module_notify(struct notifier_block *self,
1091 unsigned long val, void *data)
1093 struct module *mod = data;
1095 mutex_lock(&event_mutex);
1097 case MODULE_STATE_COMING:
1098 trace_module_add_events(mod);
1100 case MODULE_STATE_GOING:
1101 trace_module_remove_events(mod);
1104 mutex_unlock(&event_mutex);
1109 static int trace_module_notify(struct notifier_block *self,
1110 unsigned long val, void *data)
1114 #endif /* CONFIG_MODULES */
1116 struct notifier_block trace_module_nb = {
1117 .notifier_call = trace_module_notify,
1121 extern struct ftrace_event_call __start_ftrace_events[];
1122 extern struct ftrace_event_call __stop_ftrace_events[];
1124 static __init int event_trace_init(void)
1126 struct ftrace_event_call *call;
1127 struct dentry *d_tracer;
1128 struct dentry *entry;
1129 struct dentry *d_events;
1132 d_tracer = tracing_init_dentry();
1136 entry = debugfs_create_file("available_events", 0444, d_tracer,
1137 (void *)&show_event_seq_ops,
1138 &ftrace_avail_fops);
1140 pr_warning("Could not create debugfs "
1141 "'available_events' entry\n");
1143 entry = debugfs_create_file("set_event", 0644, d_tracer,
1144 (void *)&show_set_event_seq_ops,
1145 &ftrace_set_event_fops);
1147 pr_warning("Could not create debugfs "
1148 "'set_event' entry\n");
1150 d_events = event_trace_events_dir();
1154 /* ring buffer internal formats */
1155 trace_create_file("header_page", 0444, d_events,
1156 ring_buffer_print_page_header,
1157 &ftrace_show_header_fops);
1159 trace_create_file("header_event", 0444, d_events,
1160 ring_buffer_print_entry_header,
1161 &ftrace_show_header_fops);
1163 trace_create_file("enable", 0644, d_events,
1164 NULL, &ftrace_system_enable_fops);
1166 for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
1167 /* The linker may leave blanks */
1170 list_add(&call->list, &ftrace_events);
1171 event_create_dir(call, d_events, &ftrace_event_id_fops,
1172 &ftrace_enable_fops, &ftrace_event_filter_fops,
1173 &ftrace_event_format_fops);
1176 ret = register_module_notifier(&trace_module_nb);
1178 pr_warning("Failed to register trace events module notifier\n");
1182 fs_initcall(event_trace_init);
1184 #ifdef CONFIG_FTRACE_STARTUP_TEST
1186 static DEFINE_SPINLOCK(test_spinlock);
1187 static DEFINE_SPINLOCK(test_spinlock_irq);
1188 static DEFINE_MUTEX(test_mutex);
1190 static __init void test_work(struct work_struct *dummy)
1192 spin_lock(&test_spinlock);
1193 spin_lock_irq(&test_spinlock_irq);
1195 spin_unlock_irq(&test_spinlock_irq);
1196 spin_unlock(&test_spinlock);
1198 mutex_lock(&test_mutex);
1200 mutex_unlock(&test_mutex);
1203 static __init int event_test_thread(void *unused)
1207 test_malloc = kmalloc(1234, GFP_KERNEL);
1209 pr_info("failed to kmalloc\n");
1211 schedule_on_each_cpu(test_work);
1215 set_current_state(TASK_INTERRUPTIBLE);
1216 while (!kthread_should_stop())
1223 * Do various things that may trigger events.
1225 static __init void event_test_stuff(void)
1227 struct task_struct *test_thread;
1229 test_thread = kthread_run(event_test_thread, NULL, "test-events");
1231 kthread_stop(test_thread);
1235 * For every trace event defined, we will test each trace point separately,
1236 * and then by groups, and finally all trace points.
1238 static __init void event_trace_self_tests(void)
1240 struct ftrace_event_call *call;
1241 struct event_subsystem *system;
1244 pr_info("Running tests on trace events:\n");
1246 list_for_each_entry(call, &ftrace_events, list) {
1248 /* Only test those that have a regfunc */
1252 pr_info("Testing event %s: ", call->name);
1255 * If an event is already enabled, someone is using
1256 * it and the self test should not be on.
1258 if (call->enabled) {
1259 pr_warning("Enabled event during self test!\n");
1275 /* Now test at the sub system level */
1277 pr_info("Running tests on trace event systems:\n");
1279 list_for_each_entry(system, &event_subsystems, list) {
1281 /* the ftrace system is special, skip it */
1282 if (strcmp(system->name, "ftrace") == 0)
1285 pr_info("Testing event system %s: ", system->name);
1287 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1);
1288 if (WARN_ON_ONCE(ret)) {
1289 pr_warning("error enabling system %s\n",
1296 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0);
1297 if (WARN_ON_ONCE(ret))
1298 pr_warning("error disabling system %s\n",
1304 /* Test with all events enabled */
1306 pr_info("Running tests on all trace events:\n");
1307 pr_info("Testing all events: ");
1309 ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1);
1310 if (WARN_ON_ONCE(ret)) {
1311 pr_warning("error enabling all events\n");
1318 ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0);
1319 if (WARN_ON_ONCE(ret)) {
1320 pr_warning("error disabling all events\n");
1327 #ifdef CONFIG_FUNCTION_TRACER
1329 static DEFINE_PER_CPU(atomic_t, test_event_disable);
1332 function_test_events_call(unsigned long ip, unsigned long parent_ip)
1334 struct ring_buffer_event *event;
1335 struct ftrace_entry *entry;
1336 unsigned long flags;
1342 pc = preempt_count();
1343 resched = ftrace_preempt_disable();
1344 cpu = raw_smp_processor_id();
1345 disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu));
1350 local_save_flags(flags);
1352 event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry),
1356 entry = ring_buffer_event_data(event);
1358 entry->parent_ip = parent_ip;
1360 trace_nowake_buffer_unlock_commit(event, flags, pc);
1363 atomic_dec(&per_cpu(test_event_disable, cpu));
1364 ftrace_preempt_enable(resched);
1367 static struct ftrace_ops trace_ops __initdata =
1369 .func = function_test_events_call,
1372 static __init void event_trace_self_test_with_function(void)
1374 register_ftrace_function(&trace_ops);
1375 pr_info("Running tests again, along with the function tracer\n");
1376 event_trace_self_tests();
1377 unregister_ftrace_function(&trace_ops);
1380 static __init void event_trace_self_test_with_function(void)
1385 static __init int event_trace_self_tests_init(void)
1388 event_trace_self_tests();
1390 event_trace_self_test_with_function();
1395 late_initcall(event_trace_self_tests_init);