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
, char *type
,
31 char *name
, int offset
, int size
, int is_signed
)
33 struct ftrace_event_field
*field
;
35 field
= kzalloc(sizeof(*field
), GFP_KERNEL
);
39 field
->name
= kstrdup(name
, GFP_KERNEL
);
43 field
->type
= kstrdup(type
, GFP_KERNEL
);
47 field
->offset
= offset
;
49 field
->is_signed
= is_signed
;
50 list_add(&field
->link
, &call
->fields
);
63 EXPORT_SYMBOL_GPL(trace_define_field
);
67 static void trace_destroy_fields(struct ftrace_event_call
*call
)
69 struct ftrace_event_field
*field
, *next
;
71 list_for_each_entry_safe(field
, next
, &call
->fields
, link
) {
72 list_del(&field
->link
);
79 #endif /* CONFIG_MODULES */
81 static void ftrace_event_enable_disable(struct ftrace_event_call
*call
,
88 tracing_stop_cmdline_record();
95 tracing_start_cmdline_record();
102 static void ftrace_clear_events(void)
104 struct ftrace_event_call
*call
;
106 mutex_lock(&event_mutex
);
107 list_for_each_entry(call
, &ftrace_events
, list
) {
108 ftrace_event_enable_disable(call
, 0);
110 mutex_unlock(&event_mutex
);
114 * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
116 static int __ftrace_set_clr_event(const char *match
, const char *sub
,
117 const char *event
, int set
)
119 struct ftrace_event_call
*call
;
122 mutex_lock(&event_mutex
);
123 list_for_each_entry(call
, &ftrace_events
, list
) {
125 if (!call
->name
|| !call
->regfunc
)
129 strcmp(match
, call
->name
) != 0 &&
130 strcmp(match
, call
->system
) != 0)
133 if (sub
&& strcmp(sub
, call
->system
) != 0)
136 if (event
&& strcmp(event
, call
->name
) != 0)
139 ftrace_event_enable_disable(call
, set
);
143 mutex_unlock(&event_mutex
);
148 static int ftrace_set_clr_event(char *buf
, int set
)
150 char *event
= NULL
, *sub
= NULL
, *match
;
153 * The buf format can be <subsystem>:<event-name>
154 * *:<event-name> means any event by that name.
155 * :<event-name> is the same.
157 * <subsystem>:* means all events in that subsystem
158 * <subsystem>: means the same.
160 * <name> (no ':') means all events in a subsystem with
161 * the name <name> or any event that matches <name>
164 match
= strsep(&buf
, ":");
170 if (!strlen(sub
) || strcmp(sub
, "*") == 0)
172 if (!strlen(event
) || strcmp(event
, "*") == 0)
176 return __ftrace_set_clr_event(match
, sub
, event
, set
);
180 * trace_set_clr_event - enable or disable an event
181 * @system: system name to match (NULL for any system)
182 * @event: event name to match (NULL for all events, within system)
183 * @set: 1 to enable, 0 to disable
185 * This is a way for other parts of the kernel to enable or disable
188 * Returns 0 on success, -EINVAL if the parameters do not match any
191 int trace_set_clr_event(const char *system
, const char *event
, int set
)
193 return __ftrace_set_clr_event(NULL
, system
, event
, set
);
196 /* 128 should be much more than enough */
197 #define EVENT_BUF_SIZE 127
200 ftrace_event_write(struct file
*file
, const char __user
*ubuf
,
201 size_t cnt
, loff_t
*ppos
)
212 ret
= tracing_update_buffers();
216 ret
= get_user(ch
, ubuf
++);
222 /* skip white space */
223 while (cnt
&& isspace(ch
)) {
224 ret
= get_user(ch
, ubuf
++);
231 /* Only white space found? */
238 buf
= kmalloc(EVENT_BUF_SIZE
+1, GFP_KERNEL
);
242 if (cnt
> EVENT_BUF_SIZE
)
243 cnt
= EVENT_BUF_SIZE
;
246 while (cnt
&& !isspace(ch
)) {
252 ret
= get_user(ch
, ubuf
++);
262 ret
= ftrace_set_clr_event(buf
, set
);
275 t_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
277 struct list_head
*list
= m
->private;
278 struct ftrace_event_call
*call
;
283 if (list
== &ftrace_events
)
286 call
= list_entry(list
, struct ftrace_event_call
, list
);
289 * The ftrace subsystem is for showing formats only.
290 * They can not be enabled or disabled via the event files.
298 m
->private = list
->next
;
303 static void *t_start(struct seq_file
*m
, loff_t
*pos
)
305 struct ftrace_event_call
*call
= NULL
;
308 mutex_lock(&event_mutex
);
310 m
->private = ftrace_events
.next
;
311 for (l
= 0; l
<= *pos
; ) {
312 call
= t_next(m
, NULL
, &l
);
320 s_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
322 struct list_head
*list
= m
->private;
323 struct ftrace_event_call
*call
;
328 if (list
== &ftrace_events
)
331 call
= list_entry(list
, struct ftrace_event_call
, list
);
333 if (!call
->enabled
) {
338 m
->private = list
->next
;
343 static void *s_start(struct seq_file
*m
, loff_t
*pos
)
345 struct ftrace_event_call
*call
= NULL
;
348 mutex_lock(&event_mutex
);
350 m
->private = ftrace_events
.next
;
351 for (l
= 0; l
<= *pos
; ) {
352 call
= s_next(m
, NULL
, &l
);
359 static int t_show(struct seq_file
*m
, void *v
)
361 struct ftrace_event_call
*call
= v
;
363 if (strcmp(call
->system
, TRACE_SYSTEM
) != 0)
364 seq_printf(m
, "%s:", call
->system
);
365 seq_printf(m
, "%s\n", call
->name
);
370 static void t_stop(struct seq_file
*m
, void *p
)
372 mutex_unlock(&event_mutex
);
376 ftrace_event_seq_open(struct inode
*inode
, struct file
*file
)
378 const struct seq_operations
*seq_ops
;
380 if ((file
->f_mode
& FMODE_WRITE
) &&
381 !(file
->f_flags
& O_APPEND
))
382 ftrace_clear_events();
384 seq_ops
= inode
->i_private
;
385 return seq_open(file
, seq_ops
);
389 event_enable_read(struct file
*filp
, char __user
*ubuf
, size_t cnt
,
392 struct ftrace_event_call
*call
= filp
->private_data
;
400 return simple_read_from_buffer(ubuf
, cnt
, ppos
, buf
, 2);
404 event_enable_write(struct file
*filp
, const char __user
*ubuf
, size_t cnt
,
407 struct ftrace_event_call
*call
= filp
->private_data
;
412 if (cnt
>= sizeof(buf
))
415 if (copy_from_user(&buf
, ubuf
, cnt
))
420 ret
= strict_strtoul(buf
, 10, &val
);
424 ret
= tracing_update_buffers();
431 mutex_lock(&event_mutex
);
432 ftrace_event_enable_disable(call
, val
);
433 mutex_unlock(&event_mutex
);
446 system_enable_read(struct file
*filp
, char __user
*ubuf
, size_t cnt
,
449 const char set_to_char
[4] = { '?', '0', '1', 'X' };
450 const char *system
= filp
->private_data
;
451 struct ftrace_event_call
*call
;
456 mutex_lock(&event_mutex
);
457 list_for_each_entry(call
, &ftrace_events
, list
) {
458 if (!call
->name
|| !call
->regfunc
)
461 if (system
&& strcmp(call
->system
, system
) != 0)
465 * We need to find out if all the events are set
466 * or if all events or cleared, or if we have
469 set
|= (1 << !!call
->enabled
);
472 * If we have a mixture, no need to look further.
477 mutex_unlock(&event_mutex
);
479 buf
[0] = set_to_char
[set
];
482 ret
= simple_read_from_buffer(ubuf
, cnt
, ppos
, buf
, 2);
488 system_enable_write(struct file
*filp
, const char __user
*ubuf
, size_t cnt
,
491 const char *system
= filp
->private_data
;
496 if (cnt
>= sizeof(buf
))
499 if (copy_from_user(&buf
, ubuf
, cnt
))
504 ret
= strict_strtoul(buf
, 10, &val
);
508 ret
= tracing_update_buffers();
512 if (val
!= 0 && val
!= 1)
515 ret
= __ftrace_set_clr_event(NULL
, system
, NULL
, val
);
527 extern char *__bad_type_size(void);
530 #define FIELD(type, name) \
531 sizeof(type) != sizeof(field.name) ? __bad_type_size() : \
532 #type, "common_" #name, offsetof(typeof(field), name), \
535 static int trace_write_header(struct trace_seq
*s
)
537 struct trace_entry field
;
539 /* struct trace_entry */
540 return trace_seq_printf(s
,
541 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
542 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
543 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
544 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
545 "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
547 FIELD(unsigned short, type
),
548 FIELD(unsigned char, flags
),
549 FIELD(unsigned char, preempt_count
),
555 event_format_read(struct file
*filp
, char __user
*ubuf
, size_t cnt
,
558 struct ftrace_event_call
*call
= filp
->private_data
;
566 s
= kmalloc(sizeof(*s
), GFP_KERNEL
);
572 /* If any of the first writes fail, so will the show_format. */
574 trace_seq_printf(s
, "name: %s\n", call
->name
);
575 trace_seq_printf(s
, "ID: %d\n", call
->id
);
576 trace_seq_printf(s
, "format:\n");
577 trace_write_header(s
);
579 r
= call
->show_format(s
);
582 * ug! The format output is bigger than a PAGE!!
584 buf
= "FORMAT TOO BIG\n";
585 r
= simple_read_from_buffer(ubuf
, cnt
, ppos
,
590 r
= simple_read_from_buffer(ubuf
, cnt
, ppos
,
598 event_id_read(struct file
*filp
, char __user
*ubuf
, size_t cnt
, loff_t
*ppos
)
600 struct ftrace_event_call
*call
= filp
->private_data
;
607 s
= kmalloc(sizeof(*s
), GFP_KERNEL
);
612 trace_seq_printf(s
, "%d\n", call
->id
);
614 r
= simple_read_from_buffer(ubuf
, cnt
, ppos
,
621 event_filter_read(struct file
*filp
, char __user
*ubuf
, size_t cnt
,
624 struct ftrace_event_call
*call
= filp
->private_data
;
631 s
= kmalloc(sizeof(*s
), GFP_KERNEL
);
637 print_event_filter(call
, s
);
638 r
= simple_read_from_buffer(ubuf
, cnt
, ppos
, s
->buffer
, s
->len
);
646 event_filter_write(struct file
*filp
, const char __user
*ubuf
, size_t cnt
,
649 struct ftrace_event_call
*call
= filp
->private_data
;
653 if (cnt
>= PAGE_SIZE
)
656 buf
= (char *)__get_free_page(GFP_TEMPORARY
);
660 if (copy_from_user(buf
, ubuf
, cnt
)) {
661 free_page((unsigned long) buf
);
666 err
= apply_event_filter(call
, buf
);
667 free_page((unsigned long) buf
);
677 subsystem_filter_read(struct file
*filp
, char __user
*ubuf
, size_t cnt
,
680 struct event_subsystem
*system
= filp
->private_data
;
687 s
= kmalloc(sizeof(*s
), GFP_KERNEL
);
693 print_subsystem_event_filter(system
, s
);
694 r
= simple_read_from_buffer(ubuf
, cnt
, ppos
, s
->buffer
, s
->len
);
702 subsystem_filter_write(struct file
*filp
, const char __user
*ubuf
, size_t cnt
,
705 struct event_subsystem
*system
= filp
->private_data
;
709 if (cnt
>= PAGE_SIZE
)
712 buf
= (char *)__get_free_page(GFP_TEMPORARY
);
716 if (copy_from_user(buf
, ubuf
, cnt
)) {
717 free_page((unsigned long) buf
);
722 err
= apply_subsystem_event_filter(system
, buf
);
723 free_page((unsigned long) buf
);
733 show_header(struct file
*filp
, char __user
*ubuf
, size_t cnt
, loff_t
*ppos
)
735 int (*func
)(struct trace_seq
*s
) = filp
->private_data
;
742 s
= kmalloc(sizeof(*s
), GFP_KERNEL
);
749 r
= simple_read_from_buffer(ubuf
, cnt
, ppos
, s
->buffer
, s
->len
);
756 static const struct seq_operations show_event_seq_ops
= {
763 static const struct seq_operations show_set_event_seq_ops
= {
770 static const struct file_operations ftrace_avail_fops
= {
771 .open
= ftrace_event_seq_open
,
774 .release
= seq_release
,
777 static const struct file_operations ftrace_set_event_fops
= {
778 .open
= ftrace_event_seq_open
,
780 .write
= ftrace_event_write
,
782 .release
= seq_release
,
785 static const struct file_operations ftrace_enable_fops
= {
786 .open
= tracing_open_generic
,
787 .read
= event_enable_read
,
788 .write
= event_enable_write
,
791 static const struct file_operations ftrace_event_format_fops
= {
792 .open
= tracing_open_generic
,
793 .read
= event_format_read
,
796 static const struct file_operations ftrace_event_id_fops
= {
797 .open
= tracing_open_generic
,
798 .read
= event_id_read
,
801 static const struct file_operations ftrace_event_filter_fops
= {
802 .open
= tracing_open_generic
,
803 .read
= event_filter_read
,
804 .write
= event_filter_write
,
807 static const struct file_operations ftrace_subsystem_filter_fops
= {
808 .open
= tracing_open_generic
,
809 .read
= subsystem_filter_read
,
810 .write
= subsystem_filter_write
,
813 static const struct file_operations ftrace_system_enable_fops
= {
814 .open
= tracing_open_generic
,
815 .read
= system_enable_read
,
816 .write
= system_enable_write
,
819 static const struct file_operations ftrace_show_header_fops
= {
820 .open
= tracing_open_generic
,
824 static struct dentry
*event_trace_events_dir(void)
826 static struct dentry
*d_tracer
;
827 static struct dentry
*d_events
;
832 d_tracer
= tracing_init_dentry();
836 d_events
= debugfs_create_dir("events", d_tracer
);
838 pr_warning("Could not create debugfs "
839 "'events' directory\n");
844 static LIST_HEAD(event_subsystems
);
846 static struct dentry
*
847 event_subsystem_dir(const char *name
, struct dentry
*d_events
)
849 struct event_subsystem
*system
;
850 struct dentry
*entry
;
852 /* First see if we did not already create this dir */
853 list_for_each_entry(system
, &event_subsystems
, list
) {
854 if (strcmp(system
->name
, name
) == 0) {
856 return system
->entry
;
860 /* need to create new entry */
861 system
= kmalloc(sizeof(*system
), GFP_KERNEL
);
863 pr_warning("No memory to create event subsystem %s\n",
868 system
->entry
= debugfs_create_dir(name
, d_events
);
869 if (!system
->entry
) {
870 pr_warning("Could not create event subsystem %s\n",
876 system
->nr_events
= 1;
877 system
->name
= kstrdup(name
, GFP_KERNEL
);
879 debugfs_remove(system
->entry
);
884 list_add(&system
->list
, &event_subsystems
);
886 system
->filter
= NULL
;
888 system
->filter
= kzalloc(sizeof(struct event_filter
), GFP_KERNEL
);
889 if (!system
->filter
) {
890 pr_warning("Could not allocate filter for subsystem "
892 return system
->entry
;
895 entry
= debugfs_create_file("filter", 0644, system
->entry
, system
,
896 &ftrace_subsystem_filter_fops
);
898 kfree(system
->filter
);
899 system
->filter
= NULL
;
900 pr_warning("Could not create debugfs "
901 "'%s/filter' entry\n", name
);
904 entry
= trace_create_file("enable", 0644, system
->entry
,
905 (void *)system
->name
,
906 &ftrace_system_enable_fops
);
908 return system
->entry
;
911 static void remove_subsystem_dir(const char *name
)
913 struct event_subsystem
*system
;
915 if (strcmp(name
, TRACE_SYSTEM
) == 0)
918 list_for_each_entry(system
, &event_subsystems
, list
) {
919 if (strcmp(system
->name
, name
) == 0) {
920 if (!--system
->nr_events
) {
921 struct event_filter
*filter
= system
->filter
;
923 debugfs_remove_recursive(system
->entry
);
924 list_del(&system
->list
);
926 kfree(filter
->filter_string
);
938 event_create_dir(struct ftrace_event_call
*call
, struct dentry
*d_events
,
939 const struct file_operations
*id
,
940 const struct file_operations
*enable
,
941 const struct file_operations
*filter
,
942 const struct file_operations
*format
)
944 struct dentry
*entry
;
948 * If the trace point header did not define TRACE_SYSTEM
949 * then the system would be called "TRACE_SYSTEM".
951 if (strcmp(call
->system
, TRACE_SYSTEM
) != 0)
952 d_events
= event_subsystem_dir(call
->system
, d_events
);
954 if (call
->raw_init
) {
955 ret
= call
->raw_init();
957 pr_warning("Could not initialize trace point"
958 " events/%s\n", call
->name
);
963 call
->dir
= debugfs_create_dir(call
->name
, d_events
);
965 pr_warning("Could not create debugfs "
966 "'%s' directory\n", call
->name
);
971 entry
= trace_create_file("enable", 0644, call
->dir
, call
,
975 entry
= trace_create_file("id", 0444, call
->dir
, call
,
978 if (call
->define_fields
) {
979 ret
= call
->define_fields();
981 pr_warning("Could not initialize trace point"
982 " events/%s\n", call
->name
);
985 entry
= trace_create_file("filter", 0644, call
->dir
, call
,
989 /* A trace may not want to export its format */
990 if (!call
->show_format
)
993 entry
= trace_create_file("format", 0444, call
->dir
, call
,
999 #define for_each_event(event, start, end) \
1000 for (event = start; \
1001 (unsigned long)event < (unsigned long)end; \
1004 #ifdef CONFIG_MODULES
1006 static LIST_HEAD(ftrace_module_file_list
);
1009 * Modules must own their file_operations to keep up with
1010 * reference counting.
1012 struct ftrace_module_file_ops
{
1013 struct list_head list
;
1015 struct file_operations id
;
1016 struct file_operations enable
;
1017 struct file_operations format
;
1018 struct file_operations filter
;
1021 static struct ftrace_module_file_ops
*
1022 trace_create_file_ops(struct module
*mod
)
1024 struct ftrace_module_file_ops
*file_ops
;
1027 * This is a bit of a PITA. To allow for correct reference
1028 * counting, modules must "own" their file_operations.
1029 * To do this, we allocate the file operations that will be
1030 * used in the event directory.
1033 file_ops
= kmalloc(sizeof(*file_ops
), GFP_KERNEL
);
1037 file_ops
->mod
= mod
;
1039 file_ops
->id
= ftrace_event_id_fops
;
1040 file_ops
->id
.owner
= mod
;
1042 file_ops
->enable
= ftrace_enable_fops
;
1043 file_ops
->enable
.owner
= mod
;
1045 file_ops
->filter
= ftrace_event_filter_fops
;
1046 file_ops
->filter
.owner
= mod
;
1048 file_ops
->format
= ftrace_event_format_fops
;
1049 file_ops
->format
.owner
= mod
;
1051 list_add(&file_ops
->list
, &ftrace_module_file_list
);
1056 static void trace_module_add_events(struct module
*mod
)
1058 struct ftrace_module_file_ops
*file_ops
= NULL
;
1059 struct ftrace_event_call
*call
, *start
, *end
;
1060 struct dentry
*d_events
;
1062 start
= mod
->trace_events
;
1063 end
= mod
->trace_events
+ mod
->num_trace_events
;
1068 d_events
= event_trace_events_dir();
1072 for_each_event(call
, start
, end
) {
1073 /* The linker may leave blanks */
1078 * This module has events, create file ops for this module
1079 * if not already done.
1082 file_ops
= trace_create_file_ops(mod
);
1087 list_add(&call
->list
, &ftrace_events
);
1088 event_create_dir(call
, d_events
,
1089 &file_ops
->id
, &file_ops
->enable
,
1090 &file_ops
->filter
, &file_ops
->format
);
1094 static void trace_module_remove_events(struct module
*mod
)
1096 struct ftrace_module_file_ops
*file_ops
;
1097 struct ftrace_event_call
*call
, *p
;
1100 down_write(&trace_event_mutex
);
1101 list_for_each_entry_safe(call
, p
, &ftrace_events
, list
) {
1102 if (call
->mod
== mod
) {
1104 ftrace_event_enable_disable(call
, 0);
1106 __unregister_ftrace_event(call
->event
);
1107 debugfs_remove_recursive(call
->dir
);
1108 list_del(&call
->list
);
1109 trace_destroy_fields(call
);
1110 destroy_preds(call
);
1111 remove_subsystem_dir(call
->system
);
1115 /* Now free the file_operations */
1116 list_for_each_entry(file_ops
, &ftrace_module_file_list
, list
) {
1117 if (file_ops
->mod
== mod
)
1120 if (&file_ops
->list
!= &ftrace_module_file_list
) {
1121 list_del(&file_ops
->list
);
1126 * It is safest to reset the ring buffer if the module being unloaded
1127 * registered any events.
1130 tracing_reset_current_online_cpus();
1131 up_write(&trace_event_mutex
);
1134 static int trace_module_notify(struct notifier_block
*self
,
1135 unsigned long val
, void *data
)
1137 struct module
*mod
= data
;
1139 mutex_lock(&event_mutex
);
1141 case MODULE_STATE_COMING
:
1142 trace_module_add_events(mod
);
1144 case MODULE_STATE_GOING
:
1145 trace_module_remove_events(mod
);
1148 mutex_unlock(&event_mutex
);
1153 static int trace_module_notify(struct notifier_block
*self
,
1154 unsigned long val
, void *data
)
1158 #endif /* CONFIG_MODULES */
1160 struct notifier_block trace_module_nb
= {
1161 .notifier_call
= trace_module_notify
,
1165 extern struct ftrace_event_call __start_ftrace_events
[];
1166 extern struct ftrace_event_call __stop_ftrace_events
[];
1168 static char bootup_event_buf
[COMMAND_LINE_SIZE
] __initdata
;
1170 static __init
int setup_trace_event(char *str
)
1172 strlcpy(bootup_event_buf
, str
, COMMAND_LINE_SIZE
);
1173 ring_buffer_expanded
= 1;
1174 tracing_selftest_disabled
= 1;
1178 __setup("trace_event=", setup_trace_event
);
1180 static __init
int event_trace_init(void)
1182 struct ftrace_event_call
*call
;
1183 struct dentry
*d_tracer
;
1184 struct dentry
*entry
;
1185 struct dentry
*d_events
;
1187 char *buf
= bootup_event_buf
;
1190 d_tracer
= tracing_init_dentry();
1194 entry
= debugfs_create_file("available_events", 0444, d_tracer
,
1195 (void *)&show_event_seq_ops
,
1196 &ftrace_avail_fops
);
1198 pr_warning("Could not create debugfs "
1199 "'available_events' entry\n");
1201 entry
= debugfs_create_file("set_event", 0644, d_tracer
,
1202 (void *)&show_set_event_seq_ops
,
1203 &ftrace_set_event_fops
);
1205 pr_warning("Could not create debugfs "
1206 "'set_event' entry\n");
1208 d_events
= event_trace_events_dir();
1212 /* ring buffer internal formats */
1213 trace_create_file("header_page", 0444, d_events
,
1214 ring_buffer_print_page_header
,
1215 &ftrace_show_header_fops
);
1217 trace_create_file("header_event", 0444, d_events
,
1218 ring_buffer_print_entry_header
,
1219 &ftrace_show_header_fops
);
1221 trace_create_file("enable", 0644, d_events
,
1222 NULL
, &ftrace_system_enable_fops
);
1224 for_each_event(call
, __start_ftrace_events
, __stop_ftrace_events
) {
1225 /* The linker may leave blanks */
1228 list_add(&call
->list
, &ftrace_events
);
1229 event_create_dir(call
, d_events
, &ftrace_event_id_fops
,
1230 &ftrace_enable_fops
, &ftrace_event_filter_fops
,
1231 &ftrace_event_format_fops
);
1235 token
= strsep(&buf
, ",");
1242 ret
= ftrace_set_clr_event(token
, 1);
1244 pr_warning("Failed to enable trace event: %s\n", token
);
1247 ret
= register_module_notifier(&trace_module_nb
);
1249 pr_warning("Failed to register trace events module notifier\n");
1253 fs_initcall(event_trace_init
);
1255 #ifdef CONFIG_FTRACE_STARTUP_TEST
1257 static DEFINE_SPINLOCK(test_spinlock
);
1258 static DEFINE_SPINLOCK(test_spinlock_irq
);
1259 static DEFINE_MUTEX(test_mutex
);
1261 static __init
void test_work(struct work_struct
*dummy
)
1263 spin_lock(&test_spinlock
);
1264 spin_lock_irq(&test_spinlock_irq
);
1266 spin_unlock_irq(&test_spinlock_irq
);
1267 spin_unlock(&test_spinlock
);
1269 mutex_lock(&test_mutex
);
1271 mutex_unlock(&test_mutex
);
1274 static __init
int event_test_thread(void *unused
)
1278 test_malloc
= kmalloc(1234, GFP_KERNEL
);
1280 pr_info("failed to kmalloc\n");
1282 schedule_on_each_cpu(test_work
);
1286 set_current_state(TASK_INTERRUPTIBLE
);
1287 while (!kthread_should_stop())
1294 * Do various things that may trigger events.
1296 static __init
void event_test_stuff(void)
1298 struct task_struct
*test_thread
;
1300 test_thread
= kthread_run(event_test_thread
, NULL
, "test-events");
1302 kthread_stop(test_thread
);
1306 * For every trace event defined, we will test each trace point separately,
1307 * and then by groups, and finally all trace points.
1309 static __init
void event_trace_self_tests(void)
1311 struct ftrace_event_call
*call
;
1312 struct event_subsystem
*system
;
1315 pr_info("Running tests on trace events:\n");
1317 list_for_each_entry(call
, &ftrace_events
, list
) {
1319 /* Only test those that have a regfunc */
1323 pr_info("Testing event %s: ", call
->name
);
1326 * If an event is already enabled, someone is using
1327 * it and the self test should not be on.
1329 if (call
->enabled
) {
1330 pr_warning("Enabled event during self test!\n");
1335 ftrace_event_enable_disable(call
, 1);
1337 ftrace_event_enable_disable(call
, 0);
1342 /* Now test at the sub system level */
1344 pr_info("Running tests on trace event systems:\n");
1346 list_for_each_entry(system
, &event_subsystems
, list
) {
1348 /* the ftrace system is special, skip it */
1349 if (strcmp(system
->name
, "ftrace") == 0)
1352 pr_info("Testing event system %s: ", system
->name
);
1354 ret
= __ftrace_set_clr_event(NULL
, system
->name
, NULL
, 1);
1355 if (WARN_ON_ONCE(ret
)) {
1356 pr_warning("error enabling system %s\n",
1363 ret
= __ftrace_set_clr_event(NULL
, system
->name
, NULL
, 0);
1364 if (WARN_ON_ONCE(ret
))
1365 pr_warning("error disabling system %s\n",
1371 /* Test with all events enabled */
1373 pr_info("Running tests on all trace events:\n");
1374 pr_info("Testing all events: ");
1376 ret
= __ftrace_set_clr_event(NULL
, NULL
, NULL
, 1);
1377 if (WARN_ON_ONCE(ret
)) {
1378 pr_warning("error enabling all events\n");
1385 ret
= __ftrace_set_clr_event(NULL
, NULL
, NULL
, 0);
1386 if (WARN_ON_ONCE(ret
)) {
1387 pr_warning("error disabling all events\n");
1394 #ifdef CONFIG_FUNCTION_TRACER
1396 static DEFINE_PER_CPU(atomic_t
, test_event_disable
);
1399 function_test_events_call(unsigned long ip
, unsigned long parent_ip
)
1401 struct ring_buffer_event
*event
;
1402 struct ftrace_entry
*entry
;
1403 unsigned long flags
;
1409 pc
= preempt_count();
1410 resched
= ftrace_preempt_disable();
1411 cpu
= raw_smp_processor_id();
1412 disabled
= atomic_inc_return(&per_cpu(test_event_disable
, cpu
));
1417 local_save_flags(flags
);
1419 event
= trace_current_buffer_lock_reserve(TRACE_FN
, sizeof(*entry
),
1423 entry
= ring_buffer_event_data(event
);
1425 entry
->parent_ip
= parent_ip
;
1427 trace_nowake_buffer_unlock_commit(event
, flags
, pc
);
1430 atomic_dec(&per_cpu(test_event_disable
, cpu
));
1431 ftrace_preempt_enable(resched
);
1434 static struct ftrace_ops trace_ops __initdata
=
1436 .func
= function_test_events_call
,
1439 static __init
void event_trace_self_test_with_function(void)
1441 register_ftrace_function(&trace_ops
);
1442 pr_info("Running tests again, along with the function tracer\n");
1443 event_trace_self_tests();
1444 unregister_ftrace_function(&trace_ops
);
1447 static __init
void event_trace_self_test_with_function(void)
1452 static __init
int event_trace_self_tests_init(void)
1454 if (!tracing_selftest_disabled
) {
1455 event_trace_self_tests();
1456 event_trace_self_test_with_function();
1462 late_initcall(event_trace_self_tests_init
);