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 <asm/setup.h>
22 #include "trace_output.h"
25 #define TRACE_SYSTEM "TRACE_SYSTEM"
27 DEFINE_MUTEX(event_mutex);
29 LIST_HEAD(ftrace_events);
31 int trace_define_field(struct ftrace_event_call *call, const char *type,
32 const char *name, int offset, int size, int is_signed,
35 struct ftrace_event_field *field;
37 field = kzalloc(sizeof(*field), GFP_KERNEL);
41 field->name = kstrdup(name, GFP_KERNEL);
45 field->type = kstrdup(type, GFP_KERNEL);
49 if (filter_type == FILTER_OTHER)
50 field->filter_type = filter_assign_type(type);
52 field->filter_type = filter_type;
54 field->offset = offset;
56 field->is_signed = is_signed;
58 list_add(&field->link, &call->fields);
71 EXPORT_SYMBOL_GPL(trace_define_field);
73 #define __common_field(type, item) \
74 ret = trace_define_field(call, #type, "common_" #item, \
75 offsetof(typeof(ent), item), \
77 is_signed_type(type), FILTER_OTHER); \
81 int trace_define_common_fields(struct ftrace_event_call *call)
84 struct trace_entry ent;
86 __common_field(unsigned short, type);
87 __common_field(unsigned char, flags);
88 __common_field(unsigned char, preempt_count);
89 __common_field(int, pid);
90 __common_field(int, lock_depth);
94 EXPORT_SYMBOL_GPL(trace_define_common_fields);
98 static void trace_destroy_fields(struct ftrace_event_call *call)
100 struct ftrace_event_field *field, *next;
102 list_for_each_entry_safe(field, next, &call->fields, link) {
103 list_del(&field->link);
110 #endif /* CONFIG_MODULES */
112 static void ftrace_event_enable_disable(struct ftrace_event_call *call,
119 tracing_stop_cmdline_record();
120 call->unregfunc(call->data);
124 if (!call->enabled) {
126 tracing_start_cmdline_record();
127 call->regfunc(call->data);
133 static void ftrace_clear_events(void)
135 struct ftrace_event_call *call;
137 mutex_lock(&event_mutex);
138 list_for_each_entry(call, &ftrace_events, list) {
139 ftrace_event_enable_disable(call, 0);
141 mutex_unlock(&event_mutex);
145 * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
147 static int __ftrace_set_clr_event(const char *match, const char *sub,
148 const char *event, int set)
150 struct ftrace_event_call *call;
153 mutex_lock(&event_mutex);
154 list_for_each_entry(call, &ftrace_events, list) {
156 if (!call->name || !call->regfunc)
160 strcmp(match, call->name) != 0 &&
161 strcmp(match, call->system) != 0)
164 if (sub && strcmp(sub, call->system) != 0)
167 if (event && strcmp(event, call->name) != 0)
170 ftrace_event_enable_disable(call, set);
174 mutex_unlock(&event_mutex);
179 static int ftrace_set_clr_event(char *buf, int set)
181 char *event = NULL, *sub = NULL, *match;
184 * The buf format can be <subsystem>:<event-name>
185 * *:<event-name> means any event by that name.
186 * :<event-name> is the same.
188 * <subsystem>:* means all events in that subsystem
189 * <subsystem>: means the same.
191 * <name> (no ':') means all events in a subsystem with
192 * the name <name> or any event that matches <name>
195 match = strsep(&buf, ":");
201 if (!strlen(sub) || strcmp(sub, "*") == 0)
203 if (!strlen(event) || strcmp(event, "*") == 0)
207 return __ftrace_set_clr_event(match, sub, event, set);
211 * trace_set_clr_event - enable or disable an event
212 * @system: system name to match (NULL for any system)
213 * @event: event name to match (NULL for all events, within system)
214 * @set: 1 to enable, 0 to disable
216 * This is a way for other parts of the kernel to enable or disable
219 * Returns 0 on success, -EINVAL if the parameters do not match any
222 int trace_set_clr_event(const char *system, const char *event, int set)
224 return __ftrace_set_clr_event(NULL, system, event, set);
227 /* 128 should be much more than enough */
228 #define EVENT_BUF_SIZE 127
231 ftrace_event_write(struct file *file, const char __user *ubuf,
232 size_t cnt, loff_t *ppos)
234 struct trace_parser parser;
241 ret = tracing_update_buffers();
245 if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1))
248 read = trace_get_user(&parser, ubuf, cnt, ppos);
250 if (trace_parser_loaded((&parser))) {
253 if (*parser.buffer == '!')
256 parser.buffer[parser.idx] = 0;
258 ret = ftrace_set_clr_event(parser.buffer + !set, set);
266 trace_parser_put(&parser);
272 t_next(struct seq_file *m, void *v, loff_t *pos)
274 struct list_head *list = m->private;
275 struct ftrace_event_call *call;
280 if (list == &ftrace_events)
283 call = list_entry(list, struct ftrace_event_call, list);
286 * The ftrace subsystem is for showing formats only.
287 * They can not be enabled or disabled via the event files.
295 m->private = list->next;
300 static void *t_start(struct seq_file *m, loff_t *pos)
302 struct ftrace_event_call *call = NULL;
305 mutex_lock(&event_mutex);
307 m->private = ftrace_events.next;
308 for (l = 0; l <= *pos; ) {
309 call = t_next(m, NULL, &l);
317 s_next(struct seq_file *m, void *v, loff_t *pos)
319 struct list_head *list = m->private;
320 struct ftrace_event_call *call;
325 if (list == &ftrace_events)
328 call = list_entry(list, struct ftrace_event_call, list);
330 if (!call->enabled) {
335 m->private = list->next;
340 static void *s_start(struct seq_file *m, loff_t *pos)
342 struct ftrace_event_call *call = NULL;
345 mutex_lock(&event_mutex);
347 m->private = ftrace_events.next;
348 for (l = 0; l <= *pos; ) {
349 call = s_next(m, NULL, &l);
356 static int t_show(struct seq_file *m, void *v)
358 struct ftrace_event_call *call = v;
360 if (strcmp(call->system, TRACE_SYSTEM) != 0)
361 seq_printf(m, "%s:", call->system);
362 seq_printf(m, "%s\n", call->name);
367 static void t_stop(struct seq_file *m, void *p)
369 mutex_unlock(&event_mutex);
373 ftrace_event_seq_open(struct inode *inode, struct file *file)
375 const struct seq_operations *seq_ops;
377 if ((file->f_mode & FMODE_WRITE) &&
378 (file->f_flags & O_TRUNC))
379 ftrace_clear_events();
381 seq_ops = inode->i_private;
382 return seq_open(file, seq_ops);
386 event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
389 struct ftrace_event_call *call = filp->private_data;
397 return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
401 event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
404 struct ftrace_event_call *call = filp->private_data;
409 if (cnt >= sizeof(buf))
412 if (copy_from_user(&buf, ubuf, cnt))
417 ret = strict_strtoul(buf, 10, &val);
421 ret = tracing_update_buffers();
428 mutex_lock(&event_mutex);
429 ftrace_event_enable_disable(call, val);
430 mutex_unlock(&event_mutex);
443 system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
446 const char set_to_char[4] = { '?', '0', '1', 'X' };
447 const char *system = filp->private_data;
448 struct ftrace_event_call *call;
453 mutex_lock(&event_mutex);
454 list_for_each_entry(call, &ftrace_events, list) {
455 if (!call->name || !call->regfunc)
458 if (system && strcmp(call->system, system) != 0)
462 * We need to find out if all the events are set
463 * or if all events or cleared, or if we have
466 set |= (1 << !!call->enabled);
469 * If we have a mixture, no need to look further.
474 mutex_unlock(&event_mutex);
476 buf[0] = set_to_char[set];
479 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
485 system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
488 const char *system = filp->private_data;
493 if (cnt >= sizeof(buf))
496 if (copy_from_user(&buf, ubuf, cnt))
501 ret = strict_strtoul(buf, 10, &val);
505 ret = tracing_update_buffers();
509 if (val != 0 && val != 1)
512 ret = __ftrace_set_clr_event(NULL, system, NULL, val);
524 extern char *__bad_type_size(void);
527 #define FIELD(type, name) \
528 sizeof(type) != sizeof(field.name) ? __bad_type_size() : \
529 #type, "common_" #name, offsetof(typeof(field), name), \
532 static int trace_write_header(struct trace_seq *s)
534 struct trace_entry field;
536 /* struct trace_entry */
537 return trace_seq_printf(s,
538 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
539 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
540 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
541 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
542 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
544 FIELD(unsigned short, type),
545 FIELD(unsigned char, flags),
546 FIELD(unsigned char, preempt_count),
548 FIELD(int, lock_depth));
552 event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
555 struct ftrace_event_call *call = filp->private_data;
563 s = kmalloc(sizeof(*s), GFP_KERNEL);
569 /* If any of the first writes fail, so will the show_format. */
571 trace_seq_printf(s, "name: %s\n", call->name);
572 trace_seq_printf(s, "ID: %d\n", call->id);
573 trace_seq_printf(s, "format:\n");
574 trace_write_header(s);
576 r = call->show_format(call, s);
579 * ug! The format output is bigger than a PAGE!!
581 buf = "FORMAT TOO BIG\n";
582 r = simple_read_from_buffer(ubuf, cnt, ppos,
587 r = simple_read_from_buffer(ubuf, cnt, ppos,
595 event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
597 struct ftrace_event_call *call = filp->private_data;
604 s = kmalloc(sizeof(*s), GFP_KERNEL);
609 trace_seq_printf(s, "%d\n", call->id);
611 r = simple_read_from_buffer(ubuf, cnt, ppos,
618 event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
621 struct ftrace_event_call *call = filp->private_data;
628 s = kmalloc(sizeof(*s), GFP_KERNEL);
634 print_event_filter(call, s);
635 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
643 event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
646 struct ftrace_event_call *call = filp->private_data;
650 if (cnt >= PAGE_SIZE)
653 buf = (char *)__get_free_page(GFP_TEMPORARY);
657 if (copy_from_user(buf, ubuf, cnt)) {
658 free_page((unsigned long) buf);
663 err = apply_event_filter(call, buf);
664 free_page((unsigned long) buf);
674 subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
677 struct event_subsystem *system = filp->private_data;
684 s = kmalloc(sizeof(*s), GFP_KERNEL);
690 print_subsystem_event_filter(system, s);
691 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
699 subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
702 struct event_subsystem *system = filp->private_data;
706 if (cnt >= PAGE_SIZE)
709 buf = (char *)__get_free_page(GFP_TEMPORARY);
713 if (copy_from_user(buf, ubuf, cnt)) {
714 free_page((unsigned long) buf);
719 err = apply_subsystem_event_filter(system, buf);
720 free_page((unsigned long) buf);
730 show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
732 int (*func)(struct trace_seq *s) = filp->private_data;
739 s = kmalloc(sizeof(*s), GFP_KERNEL);
746 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
753 static const struct seq_operations show_event_seq_ops = {
760 static const struct seq_operations show_set_event_seq_ops = {
767 static const struct file_operations ftrace_avail_fops = {
768 .open = ftrace_event_seq_open,
771 .release = seq_release,
774 static const struct file_operations ftrace_set_event_fops = {
775 .open = ftrace_event_seq_open,
777 .write = ftrace_event_write,
779 .release = seq_release,
782 static const struct file_operations ftrace_enable_fops = {
783 .open = tracing_open_generic,
784 .read = event_enable_read,
785 .write = event_enable_write,
788 static const struct file_operations ftrace_event_format_fops = {
789 .open = tracing_open_generic,
790 .read = event_format_read,
793 static const struct file_operations ftrace_event_id_fops = {
794 .open = tracing_open_generic,
795 .read = event_id_read,
798 static const struct file_operations ftrace_event_filter_fops = {
799 .open = tracing_open_generic,
800 .read = event_filter_read,
801 .write = event_filter_write,
804 static const struct file_operations ftrace_subsystem_filter_fops = {
805 .open = tracing_open_generic,
806 .read = subsystem_filter_read,
807 .write = subsystem_filter_write,
810 static const struct file_operations ftrace_system_enable_fops = {
811 .open = tracing_open_generic,
812 .read = system_enable_read,
813 .write = system_enable_write,
816 static const struct file_operations ftrace_show_header_fops = {
817 .open = tracing_open_generic,
821 static struct dentry *event_trace_events_dir(void)
823 static struct dentry *d_tracer;
824 static struct dentry *d_events;
829 d_tracer = tracing_init_dentry();
833 d_events = debugfs_create_dir("events", d_tracer);
835 pr_warning("Could not create debugfs "
836 "'events' directory\n");
841 static LIST_HEAD(event_subsystems);
843 static struct dentry *
844 event_subsystem_dir(const char *name, struct dentry *d_events)
846 struct event_subsystem *system;
847 struct dentry *entry;
849 /* First see if we did not already create this dir */
850 list_for_each_entry(system, &event_subsystems, list) {
851 if (strcmp(system->name, name) == 0) {
853 return system->entry;
857 /* need to create new entry */
858 system = kmalloc(sizeof(*system), GFP_KERNEL);
860 pr_warning("No memory to create event subsystem %s\n",
865 system->entry = debugfs_create_dir(name, d_events);
866 if (!system->entry) {
867 pr_warning("Could not create event subsystem %s\n",
873 system->nr_events = 1;
874 system->name = kstrdup(name, GFP_KERNEL);
876 debugfs_remove(system->entry);
881 list_add(&system->list, &event_subsystems);
883 system->filter = NULL;
885 system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
886 if (!system->filter) {
887 pr_warning("Could not allocate filter for subsystem "
889 return system->entry;
892 entry = debugfs_create_file("filter", 0644, system->entry, system,
893 &ftrace_subsystem_filter_fops);
895 kfree(system->filter);
896 system->filter = NULL;
897 pr_warning("Could not create debugfs "
898 "'%s/filter' entry\n", name);
901 entry = trace_create_file("enable", 0644, system->entry,
902 (void *)system->name,
903 &ftrace_system_enable_fops);
905 return system->entry;
909 event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
910 const struct file_operations *id,
911 const struct file_operations *enable,
912 const struct file_operations *filter,
913 const struct file_operations *format)
915 struct dentry *entry;
919 * If the trace point header did not define TRACE_SYSTEM
920 * then the system would be called "TRACE_SYSTEM".
922 if (strcmp(call->system, TRACE_SYSTEM) != 0)
923 d_events = event_subsystem_dir(call->system, d_events);
925 call->dir = debugfs_create_dir(call->name, d_events);
927 pr_warning("Could not create debugfs "
928 "'%s' directory\n", call->name);
933 entry = trace_create_file("enable", 0644, call->dir, call,
936 if (call->id && call->profile_enable)
937 entry = trace_create_file("id", 0444, call->dir, call,
940 if (call->define_fields) {
941 ret = call->define_fields(call);
943 pr_warning("Could not initialize trace point"
944 " events/%s\n", call->name);
947 entry = trace_create_file("filter", 0644, call->dir, call,
951 /* A trace may not want to export its format */
952 if (!call->show_format)
955 entry = trace_create_file("format", 0444, call->dir, call,
961 #define for_each_event(event, start, end) \
962 for (event = start; \
963 (unsigned long)event < (unsigned long)end; \
966 #ifdef CONFIG_MODULES
968 static LIST_HEAD(ftrace_module_file_list);
971 * Modules must own their file_operations to keep up with
972 * reference counting.
974 struct ftrace_module_file_ops {
975 struct list_head list;
977 struct file_operations id;
978 struct file_operations enable;
979 struct file_operations format;
980 struct file_operations filter;
983 static void remove_subsystem_dir(const char *name)
985 struct event_subsystem *system;
987 if (strcmp(name, TRACE_SYSTEM) == 0)
990 list_for_each_entry(system, &event_subsystems, list) {
991 if (strcmp(system->name, name) == 0) {
992 if (!--system->nr_events) {
993 struct event_filter *filter = system->filter;
995 debugfs_remove_recursive(system->entry);
996 list_del(&system->list);
998 kfree(filter->filter_string);
1001 kfree(system->name);
1009 static struct ftrace_module_file_ops *
1010 trace_create_file_ops(struct module *mod)
1012 struct ftrace_module_file_ops *file_ops;
1015 * This is a bit of a PITA. To allow for correct reference
1016 * counting, modules must "own" their file_operations.
1017 * To do this, we allocate the file operations that will be
1018 * used in the event directory.
1021 file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
1025 file_ops->mod = mod;
1027 file_ops->id = ftrace_event_id_fops;
1028 file_ops->id.owner = mod;
1030 file_ops->enable = ftrace_enable_fops;
1031 file_ops->enable.owner = mod;
1033 file_ops->filter = ftrace_event_filter_fops;
1034 file_ops->filter.owner = mod;
1036 file_ops->format = ftrace_event_format_fops;
1037 file_ops->format.owner = mod;
1039 list_add(&file_ops->list, &ftrace_module_file_list);
1044 static void trace_module_add_events(struct module *mod)
1046 struct ftrace_module_file_ops *file_ops = NULL;
1047 struct ftrace_event_call *call, *start, *end;
1048 struct dentry *d_events;
1051 start = mod->trace_events;
1052 end = mod->trace_events + mod->num_trace_events;
1057 d_events = event_trace_events_dir();
1061 for_each_event(call, start, end) {
1062 /* The linker may leave blanks */
1065 if (call->raw_init) {
1066 ret = call->raw_init();
1069 pr_warning("Could not initialize trace "
1070 "point events/%s\n", call->name);
1075 * This module has events, create file ops for this module
1076 * if not already done.
1079 file_ops = trace_create_file_ops(mod);
1084 list_add(&call->list, &ftrace_events);
1085 event_create_dir(call, d_events,
1086 &file_ops->id, &file_ops->enable,
1087 &file_ops->filter, &file_ops->format);
1091 static void trace_module_remove_events(struct module *mod)
1093 struct ftrace_module_file_ops *file_ops;
1094 struct ftrace_event_call *call, *p;
1097 down_write(&trace_event_mutex);
1098 list_for_each_entry_safe(call, p, &ftrace_events, list) {
1099 if (call->mod == mod) {
1101 ftrace_event_enable_disable(call, 0);
1103 __unregister_ftrace_event(call->event);
1104 debugfs_remove_recursive(call->dir);
1105 list_del(&call->list);
1106 trace_destroy_fields(call);
1107 destroy_preds(call);
1108 remove_subsystem_dir(call->system);
1112 /* Now free the file_operations */
1113 list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
1114 if (file_ops->mod == mod)
1117 if (&file_ops->list != &ftrace_module_file_list) {
1118 list_del(&file_ops->list);
1123 * It is safest to reset the ring buffer if the module being unloaded
1124 * registered any events.
1127 tracing_reset_current_online_cpus();
1128 up_write(&trace_event_mutex);
1131 static int trace_module_notify(struct notifier_block *self,
1132 unsigned long val, void *data)
1134 struct module *mod = data;
1136 mutex_lock(&event_mutex);
1138 case MODULE_STATE_COMING:
1139 trace_module_add_events(mod);
1141 case MODULE_STATE_GOING:
1142 trace_module_remove_events(mod);
1145 mutex_unlock(&event_mutex);
1150 static int trace_module_notify(struct notifier_block *self,
1151 unsigned long val, void *data)
1155 #endif /* CONFIG_MODULES */
1157 static struct notifier_block trace_module_nb = {
1158 .notifier_call = trace_module_notify,
1162 extern struct ftrace_event_call __start_ftrace_events[];
1163 extern struct ftrace_event_call __stop_ftrace_events[];
1165 static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;
1167 static __init int setup_trace_event(char *str)
1169 strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
1170 ring_buffer_expanded = 1;
1171 tracing_selftest_disabled = 1;
1175 __setup("trace_event=", setup_trace_event);
1177 static __init int event_trace_init(void)
1179 struct ftrace_event_call *call;
1180 struct dentry *d_tracer;
1181 struct dentry *entry;
1182 struct dentry *d_events;
1184 char *buf = bootup_event_buf;
1187 d_tracer = tracing_init_dentry();
1191 entry = debugfs_create_file("available_events", 0444, d_tracer,
1192 (void *)&show_event_seq_ops,
1193 &ftrace_avail_fops);
1195 pr_warning("Could not create debugfs "
1196 "'available_events' entry\n");
1198 entry = debugfs_create_file("set_event", 0644, d_tracer,
1199 (void *)&show_set_event_seq_ops,
1200 &ftrace_set_event_fops);
1202 pr_warning("Could not create debugfs "
1203 "'set_event' entry\n");
1205 d_events = event_trace_events_dir();
1209 /* ring buffer internal formats */
1210 trace_create_file("header_page", 0444, d_events,
1211 ring_buffer_print_page_header,
1212 &ftrace_show_header_fops);
1214 trace_create_file("header_event", 0444, d_events,
1215 ring_buffer_print_entry_header,
1216 &ftrace_show_header_fops);
1218 trace_create_file("enable", 0644, d_events,
1219 NULL, &ftrace_system_enable_fops);
1221 for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
1222 /* The linker may leave blanks */
1225 if (call->raw_init) {
1226 ret = call->raw_init();
1229 pr_warning("Could not initialize trace "
1230 "point events/%s\n", call->name);
1234 list_add(&call->list, &ftrace_events);
1235 event_create_dir(call, d_events, &ftrace_event_id_fops,
1236 &ftrace_enable_fops, &ftrace_event_filter_fops,
1237 &ftrace_event_format_fops);
1241 token = strsep(&buf, ",");
1248 ret = ftrace_set_clr_event(token, 1);
1250 pr_warning("Failed to enable trace event: %s\n", token);
1253 ret = register_module_notifier(&trace_module_nb);
1255 pr_warning("Failed to register trace events module notifier\n");
1259 fs_initcall(event_trace_init);
1261 #ifdef CONFIG_FTRACE_STARTUP_TEST
1263 static DEFINE_SPINLOCK(test_spinlock);
1264 static DEFINE_SPINLOCK(test_spinlock_irq);
1265 static DEFINE_MUTEX(test_mutex);
1267 static __init void test_work(struct work_struct *dummy)
1269 spin_lock(&test_spinlock);
1270 spin_lock_irq(&test_spinlock_irq);
1272 spin_unlock_irq(&test_spinlock_irq);
1273 spin_unlock(&test_spinlock);
1275 mutex_lock(&test_mutex);
1277 mutex_unlock(&test_mutex);
1280 static __init int event_test_thread(void *unused)
1284 test_malloc = kmalloc(1234, GFP_KERNEL);
1286 pr_info("failed to kmalloc\n");
1288 schedule_on_each_cpu(test_work);
1292 set_current_state(TASK_INTERRUPTIBLE);
1293 while (!kthread_should_stop())
1300 * Do various things that may trigger events.
1302 static __init void event_test_stuff(void)
1304 struct task_struct *test_thread;
1306 test_thread = kthread_run(event_test_thread, NULL, "test-events");
1308 kthread_stop(test_thread);
1312 * For every trace event defined, we will test each trace point separately,
1313 * and then by groups, and finally all trace points.
1315 static __init void event_trace_self_tests(void)
1317 struct ftrace_event_call *call;
1318 struct event_subsystem *system;
1321 pr_info("Running tests on trace events:\n");
1323 list_for_each_entry(call, &ftrace_events, list) {
1325 /* Only test those that have a regfunc */
1330 * Testing syscall events here is pretty useless, but
1331 * we still do it if configured. But this is time consuming.
1332 * What we really need is a user thread to perform the
1333 * syscalls as we test.
1335 #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS
1337 strcmp(call->system, "syscalls") == 0)
1341 pr_info("Testing event %s: ", call->name);
1344 * If an event is already enabled, someone is using
1345 * it and the self test should not be on.
1347 if (call->enabled) {
1348 pr_warning("Enabled event during self test!\n");
1353 ftrace_event_enable_disable(call, 1);
1355 ftrace_event_enable_disable(call, 0);
1360 /* Now test at the sub system level */
1362 pr_info("Running tests on trace event systems:\n");
1364 list_for_each_entry(system, &event_subsystems, list) {
1366 /* the ftrace system is special, skip it */
1367 if (strcmp(system->name, "ftrace") == 0)
1370 pr_info("Testing event system %s: ", system->name);
1372 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1);
1373 if (WARN_ON_ONCE(ret)) {
1374 pr_warning("error enabling system %s\n",
1381 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0);
1382 if (WARN_ON_ONCE(ret))
1383 pr_warning("error disabling system %s\n",
1389 /* Test with all events enabled */
1391 pr_info("Running tests on all trace events:\n");
1392 pr_info("Testing all events: ");
1394 ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1);
1395 if (WARN_ON_ONCE(ret)) {
1396 pr_warning("error enabling all events\n");
1403 ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0);
1404 if (WARN_ON_ONCE(ret)) {
1405 pr_warning("error disabling all events\n");
1412 #ifdef CONFIG_FUNCTION_TRACER
1414 static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable);
1417 function_test_events_call(unsigned long ip, unsigned long parent_ip)
1419 struct ring_buffer_event *event;
1420 struct ring_buffer *buffer;
1421 struct ftrace_entry *entry;
1422 unsigned long flags;
1428 pc = preempt_count();
1429 resched = ftrace_preempt_disable();
1430 cpu = raw_smp_processor_id();
1431 disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
1436 local_save_flags(flags);
1438 event = trace_current_buffer_lock_reserve(&buffer,
1439 TRACE_FN, sizeof(*entry),
1443 entry = ring_buffer_event_data(event);
1445 entry->parent_ip = parent_ip;
1447 trace_nowake_buffer_unlock_commit(buffer, event, flags, pc);
1450 atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
1451 ftrace_preempt_enable(resched);
1454 static struct ftrace_ops trace_ops __initdata =
1456 .func = function_test_events_call,
1459 static __init void event_trace_self_test_with_function(void)
1461 register_ftrace_function(&trace_ops);
1462 pr_info("Running tests again, along with the function tracer\n");
1463 event_trace_self_tests();
1464 unregister_ftrace_function(&trace_ops);
1467 static __init void event_trace_self_test_with_function(void)
1472 static __init int event_trace_self_tests_init(void)
1474 if (!tracing_selftest_disabled) {
1475 event_trace_self_tests();
1476 event_trace_self_test_with_function();
1482 late_initcall(event_trace_self_tests_init);