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"
24 #define TRACE_SYSTEM "TRACE_SYSTEM"
26 DEFINE_MUTEX(event_mutex);
28 LIST_HEAD(ftrace_events);
30 int trace_define_field(struct ftrace_event_call *call, const char *type,
31 const char *name, int offset, int size, int is_signed,
34 struct ftrace_event_field *field;
36 field = kzalloc(sizeof(*field), GFP_KERNEL);
40 field->name = kstrdup(name, GFP_KERNEL);
44 field->type = kstrdup(type, GFP_KERNEL);
48 if (filter_type == FILTER_OTHER)
49 field->filter_type = filter_assign_type(type);
51 field->filter_type = filter_type;
53 field->offset = offset;
55 field->is_signed = is_signed;
57 list_add(&field->link, &call->fields);
70 EXPORT_SYMBOL_GPL(trace_define_field);
72 #define __common_field(type, item) \
73 ret = trace_define_field(call, #type, "common_" #item, \
74 offsetof(typeof(ent), item), \
76 is_signed_type(type), FILTER_OTHER); \
80 int trace_define_common_fields(struct ftrace_event_call *call)
83 struct trace_entry ent;
85 __common_field(unsigned short, type);
86 __common_field(unsigned char, flags);
87 __common_field(unsigned char, preempt_count);
88 __common_field(int, pid);
89 __common_field(int, tgid);
93 EXPORT_SYMBOL_GPL(trace_define_common_fields);
97 static void trace_destroy_fields(struct ftrace_event_call *call)
99 struct ftrace_event_field *field, *next;
101 list_for_each_entry_safe(field, next, &call->fields, link) {
102 list_del(&field->link);
109 #endif /* CONFIG_MODULES */
111 static void ftrace_event_enable_disable(struct ftrace_event_call *call,
118 tracing_stop_cmdline_record();
119 call->unregfunc(call->data);
123 if (!call->enabled) {
125 tracing_start_cmdline_record();
126 call->regfunc(call->data);
132 static void ftrace_clear_events(void)
134 struct ftrace_event_call *call;
136 mutex_lock(&event_mutex);
137 list_for_each_entry(call, &ftrace_events, list) {
138 ftrace_event_enable_disable(call, 0);
140 mutex_unlock(&event_mutex);
144 * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
146 static int __ftrace_set_clr_event(const char *match, const char *sub,
147 const char *event, int set)
149 struct ftrace_event_call *call;
152 mutex_lock(&event_mutex);
153 list_for_each_entry(call, &ftrace_events, list) {
155 if (!call->name || !call->regfunc)
159 strcmp(match, call->name) != 0 &&
160 strcmp(match, call->system) != 0)
163 if (sub && strcmp(sub, call->system) != 0)
166 if (event && strcmp(event, call->name) != 0)
169 ftrace_event_enable_disable(call, set);
173 mutex_unlock(&event_mutex);
178 static int ftrace_set_clr_event(char *buf, int set)
180 char *event = NULL, *sub = NULL, *match;
183 * The buf format can be <subsystem>:<event-name>
184 * *:<event-name> means any event by that name.
185 * :<event-name> is the same.
187 * <subsystem>:* means all events in that subsystem
188 * <subsystem>: means the same.
190 * <name> (no ':') means all events in a subsystem with
191 * the name <name> or any event that matches <name>
194 match = strsep(&buf, ":");
200 if (!strlen(sub) || strcmp(sub, "*") == 0)
202 if (!strlen(event) || strcmp(event, "*") == 0)
206 return __ftrace_set_clr_event(match, sub, event, set);
210 * trace_set_clr_event - enable or disable an event
211 * @system: system name to match (NULL for any system)
212 * @event: event name to match (NULL for all events, within system)
213 * @set: 1 to enable, 0 to disable
215 * This is a way for other parts of the kernel to enable or disable
218 * Returns 0 on success, -EINVAL if the parameters do not match any
221 int trace_set_clr_event(const char *system, const char *event, int set)
223 return __ftrace_set_clr_event(NULL, system, event, set);
226 /* 128 should be much more than enough */
227 #define EVENT_BUF_SIZE 127
230 ftrace_event_write(struct file *file, const char __user *ubuf,
231 size_t cnt, loff_t *ppos)
242 ret = tracing_update_buffers();
246 ret = get_user(ch, ubuf++);
252 /* skip white space */
253 while (cnt && isspace(ch)) {
254 ret = get_user(ch, ubuf++);
261 /* Only white space found? */
268 buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL);
272 if (cnt > EVENT_BUF_SIZE)
273 cnt = EVENT_BUF_SIZE;
276 while (cnt && !isspace(ch)) {
282 ret = get_user(ch, ubuf++);
292 ret = ftrace_set_clr_event(buf, set);
305 t_next(struct seq_file *m, void *v, loff_t *pos)
307 struct list_head *list = m->private;
308 struct ftrace_event_call *call;
313 if (list == &ftrace_events)
316 call = list_entry(list, struct ftrace_event_call, list);
319 * The ftrace subsystem is for showing formats only.
320 * They can not be enabled or disabled via the event files.
328 m->private = list->next;
333 static void *t_start(struct seq_file *m, loff_t *pos)
335 struct ftrace_event_call *call = NULL;
338 mutex_lock(&event_mutex);
340 m->private = ftrace_events.next;
341 for (l = 0; l <= *pos; ) {
342 call = t_next(m, NULL, &l);
350 s_next(struct seq_file *m, void *v, loff_t *pos)
352 struct list_head *list = m->private;
353 struct ftrace_event_call *call;
358 if (list == &ftrace_events)
361 call = list_entry(list, struct ftrace_event_call, list);
363 if (!call->enabled) {
368 m->private = list->next;
373 static void *s_start(struct seq_file *m, loff_t *pos)
375 struct ftrace_event_call *call = NULL;
378 mutex_lock(&event_mutex);
380 m->private = ftrace_events.next;
381 for (l = 0; l <= *pos; ) {
382 call = s_next(m, NULL, &l);
389 static int t_show(struct seq_file *m, void *v)
391 struct ftrace_event_call *call = v;
393 if (strcmp(call->system, TRACE_SYSTEM) != 0)
394 seq_printf(m, "%s:", call->system);
395 seq_printf(m, "%s\n", call->name);
400 static void t_stop(struct seq_file *m, void *p)
402 mutex_unlock(&event_mutex);
406 ftrace_event_seq_open(struct inode *inode, struct file *file)
408 const struct seq_operations *seq_ops;
410 if ((file->f_mode & FMODE_WRITE) &&
411 (file->f_flags & O_TRUNC))
412 ftrace_clear_events();
414 seq_ops = inode->i_private;
415 return seq_open(file, seq_ops);
419 event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
422 struct ftrace_event_call *call = filp->private_data;
430 return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
434 event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
437 struct ftrace_event_call *call = filp->private_data;
442 if (cnt >= sizeof(buf))
445 if (copy_from_user(&buf, ubuf, cnt))
450 ret = strict_strtoul(buf, 10, &val);
454 ret = tracing_update_buffers();
461 mutex_lock(&event_mutex);
462 ftrace_event_enable_disable(call, val);
463 mutex_unlock(&event_mutex);
476 system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
479 const char set_to_char[4] = { '?', '0', '1', 'X' };
480 const char *system = filp->private_data;
481 struct ftrace_event_call *call;
486 mutex_lock(&event_mutex);
487 list_for_each_entry(call, &ftrace_events, list) {
488 if (!call->name || !call->regfunc)
491 if (system && strcmp(call->system, system) != 0)
495 * We need to find out if all the events are set
496 * or if all events or cleared, or if we have
499 set |= (1 << !!call->enabled);
502 * If we have a mixture, no need to look further.
507 mutex_unlock(&event_mutex);
509 buf[0] = set_to_char[set];
512 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
518 system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
521 const char *system = filp->private_data;
526 if (cnt >= sizeof(buf))
529 if (copy_from_user(&buf, ubuf, cnt))
534 ret = strict_strtoul(buf, 10, &val);
538 ret = tracing_update_buffers();
542 if (val != 0 && val != 1)
545 ret = __ftrace_set_clr_event(NULL, system, NULL, val);
557 extern char *__bad_type_size(void);
560 #define FIELD(type, name) \
561 sizeof(type) != sizeof(field.name) ? __bad_type_size() : \
562 #type, "common_" #name, offsetof(typeof(field), name), \
565 static int trace_write_header(struct trace_seq *s)
567 struct trace_entry field;
569 /* struct trace_entry */
570 return trace_seq_printf(s,
571 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
572 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
573 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
574 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
575 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
577 FIELD(unsigned short, type),
578 FIELD(unsigned char, flags),
579 FIELD(unsigned char, preempt_count),
585 event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
588 struct ftrace_event_call *call = filp->private_data;
596 s = kmalloc(sizeof(*s), GFP_KERNEL);
602 /* If any of the first writes fail, so will the show_format. */
604 trace_seq_printf(s, "name: %s\n", call->name);
605 trace_seq_printf(s, "ID: %d\n", call->id);
606 trace_seq_printf(s, "format:\n");
607 trace_write_header(s);
609 r = call->show_format(call, s);
612 * ug! The format output is bigger than a PAGE!!
614 buf = "FORMAT TOO BIG\n";
615 r = simple_read_from_buffer(ubuf, cnt, ppos,
620 r = simple_read_from_buffer(ubuf, cnt, ppos,
628 event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
630 struct ftrace_event_call *call = filp->private_data;
637 s = kmalloc(sizeof(*s), GFP_KERNEL);
642 trace_seq_printf(s, "%d\n", call->id);
644 r = simple_read_from_buffer(ubuf, cnt, ppos,
651 event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
654 struct ftrace_event_call *call = filp->private_data;
661 s = kmalloc(sizeof(*s), GFP_KERNEL);
667 print_event_filter(call, s);
668 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
676 event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
679 struct ftrace_event_call *call = filp->private_data;
683 if (cnt >= PAGE_SIZE)
686 buf = (char *)__get_free_page(GFP_TEMPORARY);
690 if (copy_from_user(buf, ubuf, cnt)) {
691 free_page((unsigned long) buf);
696 err = apply_event_filter(call, buf);
697 free_page((unsigned long) buf);
707 subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
710 struct event_subsystem *system = filp->private_data;
717 s = kmalloc(sizeof(*s), GFP_KERNEL);
723 print_subsystem_event_filter(system, s);
724 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
732 subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
735 struct event_subsystem *system = filp->private_data;
739 if (cnt >= PAGE_SIZE)
742 buf = (char *)__get_free_page(GFP_TEMPORARY);
746 if (copy_from_user(buf, ubuf, cnt)) {
747 free_page((unsigned long) buf);
752 err = apply_subsystem_event_filter(system, buf);
753 free_page((unsigned long) buf);
763 show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
765 int (*func)(struct trace_seq *s) = filp->private_data;
772 s = kmalloc(sizeof(*s), GFP_KERNEL);
779 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
786 static const struct seq_operations show_event_seq_ops = {
793 static const struct seq_operations show_set_event_seq_ops = {
800 static const struct file_operations ftrace_avail_fops = {
801 .open = ftrace_event_seq_open,
804 .release = seq_release,
807 static const struct file_operations ftrace_set_event_fops = {
808 .open = ftrace_event_seq_open,
810 .write = ftrace_event_write,
812 .release = seq_release,
815 static const struct file_operations ftrace_enable_fops = {
816 .open = tracing_open_generic,
817 .read = event_enable_read,
818 .write = event_enable_write,
821 static const struct file_operations ftrace_event_format_fops = {
822 .open = tracing_open_generic,
823 .read = event_format_read,
826 static const struct file_operations ftrace_event_id_fops = {
827 .open = tracing_open_generic,
828 .read = event_id_read,
831 static const struct file_operations ftrace_event_filter_fops = {
832 .open = tracing_open_generic,
833 .read = event_filter_read,
834 .write = event_filter_write,
837 static const struct file_operations ftrace_subsystem_filter_fops = {
838 .open = tracing_open_generic,
839 .read = subsystem_filter_read,
840 .write = subsystem_filter_write,
843 static const struct file_operations ftrace_system_enable_fops = {
844 .open = tracing_open_generic,
845 .read = system_enable_read,
846 .write = system_enable_write,
849 static const struct file_operations ftrace_show_header_fops = {
850 .open = tracing_open_generic,
854 static struct dentry *event_trace_events_dir(void)
856 static struct dentry *d_tracer;
857 static struct dentry *d_events;
862 d_tracer = tracing_init_dentry();
866 d_events = debugfs_create_dir("events", d_tracer);
868 pr_warning("Could not create debugfs "
869 "'events' directory\n");
874 static LIST_HEAD(event_subsystems);
876 static struct dentry *
877 event_subsystem_dir(const char *name, struct dentry *d_events)
879 struct event_subsystem *system;
880 struct dentry *entry;
882 /* First see if we did not already create this dir */
883 list_for_each_entry(system, &event_subsystems, list) {
884 if (strcmp(system->name, name) == 0) {
886 return system->entry;
890 /* need to create new entry */
891 system = kmalloc(sizeof(*system), GFP_KERNEL);
893 pr_warning("No memory to create event subsystem %s\n",
898 system->entry = debugfs_create_dir(name, d_events);
899 if (!system->entry) {
900 pr_warning("Could not create event subsystem %s\n",
906 system->nr_events = 1;
907 system->name = kstrdup(name, GFP_KERNEL);
909 debugfs_remove(system->entry);
914 list_add(&system->list, &event_subsystems);
916 system->filter = NULL;
918 system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
919 if (!system->filter) {
920 pr_warning("Could not allocate filter for subsystem "
922 return system->entry;
925 entry = debugfs_create_file("filter", 0644, system->entry, system,
926 &ftrace_subsystem_filter_fops);
928 kfree(system->filter);
929 system->filter = NULL;
930 pr_warning("Could not create debugfs "
931 "'%s/filter' entry\n", name);
934 entry = trace_create_file("enable", 0644, system->entry,
935 (void *)system->name,
936 &ftrace_system_enable_fops);
938 return system->entry;
942 event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
943 const struct file_operations *id,
944 const struct file_operations *enable,
945 const struct file_operations *filter,
946 const struct file_operations *format)
948 struct dentry *entry;
952 * If the trace point header did not define TRACE_SYSTEM
953 * then the system would be called "TRACE_SYSTEM".
955 if (strcmp(call->system, TRACE_SYSTEM) != 0)
956 d_events = event_subsystem_dir(call->system, d_events);
958 call->dir = debugfs_create_dir(call->name, d_events);
960 pr_warning("Could not create debugfs "
961 "'%s' directory\n", call->name);
966 entry = trace_create_file("enable", 0644, call->dir, call,
969 if (call->id && call->profile_enable)
970 entry = trace_create_file("id", 0444, call->dir, call,
973 if (call->define_fields) {
974 ret = call->define_fields(call);
976 pr_warning("Could not initialize trace point"
977 " events/%s\n", call->name);
980 entry = trace_create_file("filter", 0644, call->dir, call,
984 /* A trace may not want to export its format */
985 if (!call->show_format)
988 entry = trace_create_file("format", 0444, call->dir, call,
994 #define for_each_event(event, start, end) \
995 for (event = start; \
996 (unsigned long)event < (unsigned long)end; \
999 #ifdef CONFIG_MODULES
1001 static LIST_HEAD(ftrace_module_file_list);
1004 * Modules must own their file_operations to keep up with
1005 * reference counting.
1007 struct ftrace_module_file_ops {
1008 struct list_head list;
1010 struct file_operations id;
1011 struct file_operations enable;
1012 struct file_operations format;
1013 struct file_operations filter;
1016 static void remove_subsystem_dir(const char *name)
1018 struct event_subsystem *system;
1020 if (strcmp(name, TRACE_SYSTEM) == 0)
1023 list_for_each_entry(system, &event_subsystems, list) {
1024 if (strcmp(system->name, name) == 0) {
1025 if (!--system->nr_events) {
1026 struct event_filter *filter = system->filter;
1028 debugfs_remove_recursive(system->entry);
1029 list_del(&system->list);
1031 kfree(filter->filter_string);
1034 kfree(system->name);
1042 static struct ftrace_module_file_ops *
1043 trace_create_file_ops(struct module *mod)
1045 struct ftrace_module_file_ops *file_ops;
1048 * This is a bit of a PITA. To allow for correct reference
1049 * counting, modules must "own" their file_operations.
1050 * To do this, we allocate the file operations that will be
1051 * used in the event directory.
1054 file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
1058 file_ops->mod = mod;
1060 file_ops->id = ftrace_event_id_fops;
1061 file_ops->id.owner = mod;
1063 file_ops->enable = ftrace_enable_fops;
1064 file_ops->enable.owner = mod;
1066 file_ops->filter = ftrace_event_filter_fops;
1067 file_ops->filter.owner = mod;
1069 file_ops->format = ftrace_event_format_fops;
1070 file_ops->format.owner = mod;
1072 list_add(&file_ops->list, &ftrace_module_file_list);
1077 static void trace_module_add_events(struct module *mod)
1079 struct ftrace_module_file_ops *file_ops = NULL;
1080 struct ftrace_event_call *call, *start, *end;
1081 struct dentry *d_events;
1084 start = mod->trace_events;
1085 end = mod->trace_events + mod->num_trace_events;
1090 d_events = event_trace_events_dir();
1094 for_each_event(call, start, end) {
1095 /* The linker may leave blanks */
1098 if (call->raw_init) {
1099 ret = call->raw_init();
1102 pr_warning("Could not initialize trace "
1103 "point events/%s\n", call->name);
1108 * This module has events, create file ops for this module
1109 * if not already done.
1112 file_ops = trace_create_file_ops(mod);
1117 list_add(&call->list, &ftrace_events);
1118 event_create_dir(call, d_events,
1119 &file_ops->id, &file_ops->enable,
1120 &file_ops->filter, &file_ops->format);
1124 static void trace_module_remove_events(struct module *mod)
1126 struct ftrace_module_file_ops *file_ops;
1127 struct ftrace_event_call *call, *p;
1130 down_write(&trace_event_mutex);
1131 list_for_each_entry_safe(call, p, &ftrace_events, list) {
1132 if (call->mod == mod) {
1134 ftrace_event_enable_disable(call, 0);
1136 __unregister_ftrace_event(call->event);
1137 debugfs_remove_recursive(call->dir);
1138 list_del(&call->list);
1139 trace_destroy_fields(call);
1140 destroy_preds(call);
1141 remove_subsystem_dir(call->system);
1145 /* Now free the file_operations */
1146 list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
1147 if (file_ops->mod == mod)
1150 if (&file_ops->list != &ftrace_module_file_list) {
1151 list_del(&file_ops->list);
1156 * It is safest to reset the ring buffer if the module being unloaded
1157 * registered any events.
1160 tracing_reset_current_online_cpus();
1161 up_write(&trace_event_mutex);
1164 static int trace_module_notify(struct notifier_block *self,
1165 unsigned long val, void *data)
1167 struct module *mod = data;
1169 mutex_lock(&event_mutex);
1171 case MODULE_STATE_COMING:
1172 trace_module_add_events(mod);
1174 case MODULE_STATE_GOING:
1175 trace_module_remove_events(mod);
1178 mutex_unlock(&event_mutex);
1183 static int trace_module_notify(struct notifier_block *self,
1184 unsigned long val, void *data)
1188 #endif /* CONFIG_MODULES */
1190 struct notifier_block trace_module_nb = {
1191 .notifier_call = trace_module_notify,
1195 extern struct ftrace_event_call __start_ftrace_events[];
1196 extern struct ftrace_event_call __stop_ftrace_events[];
1198 static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;
1200 static __init int setup_trace_event(char *str)
1202 strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
1203 ring_buffer_expanded = 1;
1204 tracing_selftest_disabled = 1;
1208 __setup("trace_event=", setup_trace_event);
1210 static __init int event_trace_init(void)
1212 struct ftrace_event_call *call;
1213 struct dentry *d_tracer;
1214 struct dentry *entry;
1215 struct dentry *d_events;
1217 char *buf = bootup_event_buf;
1220 d_tracer = tracing_init_dentry();
1224 entry = debugfs_create_file("available_events", 0444, d_tracer,
1225 (void *)&show_event_seq_ops,
1226 &ftrace_avail_fops);
1228 pr_warning("Could not create debugfs "
1229 "'available_events' entry\n");
1231 entry = debugfs_create_file("set_event", 0644, d_tracer,
1232 (void *)&show_set_event_seq_ops,
1233 &ftrace_set_event_fops);
1235 pr_warning("Could not create debugfs "
1236 "'set_event' entry\n");
1238 d_events = event_trace_events_dir();
1242 /* ring buffer internal formats */
1243 trace_create_file("header_page", 0444, d_events,
1244 ring_buffer_print_page_header,
1245 &ftrace_show_header_fops);
1247 trace_create_file("header_event", 0444, d_events,
1248 ring_buffer_print_entry_header,
1249 &ftrace_show_header_fops);
1251 trace_create_file("enable", 0644, d_events,
1252 NULL, &ftrace_system_enable_fops);
1254 for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
1255 /* The linker may leave blanks */
1258 if (call->raw_init) {
1259 ret = call->raw_init();
1262 pr_warning("Could not initialize trace "
1263 "point events/%s\n", call->name);
1267 list_add(&call->list, &ftrace_events);
1268 event_create_dir(call, d_events, &ftrace_event_id_fops,
1269 &ftrace_enable_fops, &ftrace_event_filter_fops,
1270 &ftrace_event_format_fops);
1274 token = strsep(&buf, ",");
1281 ret = ftrace_set_clr_event(token, 1);
1283 pr_warning("Failed to enable trace event: %s\n", token);
1286 ret = register_module_notifier(&trace_module_nb);
1288 pr_warning("Failed to register trace events module notifier\n");
1292 fs_initcall(event_trace_init);
1294 #ifdef CONFIG_FTRACE_STARTUP_TEST
1296 static DEFINE_SPINLOCK(test_spinlock);
1297 static DEFINE_SPINLOCK(test_spinlock_irq);
1298 static DEFINE_MUTEX(test_mutex);
1300 static __init void test_work(struct work_struct *dummy)
1302 spin_lock(&test_spinlock);
1303 spin_lock_irq(&test_spinlock_irq);
1305 spin_unlock_irq(&test_spinlock_irq);
1306 spin_unlock(&test_spinlock);
1308 mutex_lock(&test_mutex);
1310 mutex_unlock(&test_mutex);
1313 static __init int event_test_thread(void *unused)
1317 test_malloc = kmalloc(1234, GFP_KERNEL);
1319 pr_info("failed to kmalloc\n");
1321 schedule_on_each_cpu(test_work);
1325 set_current_state(TASK_INTERRUPTIBLE);
1326 while (!kthread_should_stop())
1333 * Do various things that may trigger events.
1335 static __init void event_test_stuff(void)
1337 struct task_struct *test_thread;
1339 test_thread = kthread_run(event_test_thread, NULL, "test-events");
1341 kthread_stop(test_thread);
1345 * For every trace event defined, we will test each trace point separately,
1346 * and then by groups, and finally all trace points.
1348 static __init void event_trace_self_tests(void)
1350 struct ftrace_event_call *call;
1351 struct event_subsystem *system;
1354 pr_info("Running tests on trace events:\n");
1356 list_for_each_entry(call, &ftrace_events, list) {
1358 /* Only test those that have a regfunc */
1362 pr_info("Testing event %s: ", call->name);
1365 * If an event is already enabled, someone is using
1366 * it and the self test should not be on.
1368 if (call->enabled) {
1369 pr_warning("Enabled event during self test!\n");
1374 ftrace_event_enable_disable(call, 1);
1376 ftrace_event_enable_disable(call, 0);
1381 /* Now test at the sub system level */
1383 pr_info("Running tests on trace event systems:\n");
1385 list_for_each_entry(system, &event_subsystems, list) {
1387 /* the ftrace system is special, skip it */
1388 if (strcmp(system->name, "ftrace") == 0)
1391 pr_info("Testing event system %s: ", system->name);
1393 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1);
1394 if (WARN_ON_ONCE(ret)) {
1395 pr_warning("error enabling system %s\n",
1402 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0);
1403 if (WARN_ON_ONCE(ret))
1404 pr_warning("error disabling system %s\n",
1410 /* Test with all events enabled */
1412 pr_info("Running tests on all trace events:\n");
1413 pr_info("Testing all events: ");
1415 ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1);
1416 if (WARN_ON_ONCE(ret)) {
1417 pr_warning("error enabling all events\n");
1424 ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0);
1425 if (WARN_ON_ONCE(ret)) {
1426 pr_warning("error disabling all events\n");
1433 #ifdef CONFIG_FUNCTION_TRACER
1435 static DEFINE_PER_CPU(atomic_t, test_event_disable);
1438 function_test_events_call(unsigned long ip, unsigned long parent_ip)
1440 struct ring_buffer_event *event;
1441 struct ring_buffer *buffer;
1442 struct ftrace_entry *entry;
1443 unsigned long flags;
1449 pc = preempt_count();
1450 resched = ftrace_preempt_disable();
1451 cpu = raw_smp_processor_id();
1452 disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu));
1457 local_save_flags(flags);
1459 event = trace_current_buffer_lock_reserve(&buffer,
1460 TRACE_FN, sizeof(*entry),
1464 entry = ring_buffer_event_data(event);
1466 entry->parent_ip = parent_ip;
1468 trace_nowake_buffer_unlock_commit(buffer, event, flags, pc);
1471 atomic_dec(&per_cpu(test_event_disable, cpu));
1472 ftrace_preempt_enable(resched);
1475 static struct ftrace_ops trace_ops __initdata =
1477 .func = function_test_events_call,
1480 static __init void event_trace_self_test_with_function(void)
1482 register_ftrace_function(&trace_ops);
1483 pr_info("Running tests again, along with the function tracer\n");
1484 event_trace_self_tests();
1485 unregister_ftrace_function(&trace_ops);
1488 static __init void event_trace_self_test_with_function(void)
1493 static __init int event_trace_self_tests_init(void)
1495 if (!tracing_selftest_disabled) {
1496 event_trace_self_tests();
1497 event_trace_self_test_with_function();
1503 late_initcall(event_trace_self_tests_init);