1 #ifndef _LINUX_FTRACE_EVENT_H
2 #define _LINUX_FTRACE_EVENT_H
4 #include <linux/trace_seq.h>
5 #include <linux/ring_buffer.h>
6 #include <linux/percpu.h>
12 DECLARE_PER_CPU(struct trace_seq
, ftrace_event_seq
);
14 struct trace_print_flags
{
19 const char *ftrace_print_flags_seq(struct trace_seq
*p
, const char *delim
,
21 const struct trace_print_flags
*flag_array
);
23 const char *ftrace_print_symbols_seq(struct trace_seq
*p
, unsigned long val
,
24 const struct trace_print_flags
*symbol_array
);
27 * The trace entry - the most basic unit of tracing. This is what
28 * is printed in the end as a single line in the trace output, such as:
30 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
35 unsigned char preempt_count
;
40 #define FTRACE_MAX_EVENT \
41 ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
44 * Trace iterator - used by printout routines who present trace
45 * results to users and which routines might sleep, etc:
47 struct trace_iterator
{
48 struct trace_array
*tr
;
53 struct ring_buffer_iter
*buffer_iter
[NR_CPUS
];
54 unsigned long iter_flags
;
56 /* The below is zeroed out in pipe_read */
58 struct trace_entry
*ent
;
65 cpumask_var_t started
;
69 typedef enum print_line_t (*trace_print_func
)(struct trace_iterator
*iter
,
72 struct hlist_node node
;
73 struct list_head list
;
75 trace_print_func trace
;
78 trace_print_func binary
;
81 extern int register_ftrace_event(struct trace_event
*event
);
82 extern int unregister_ftrace_event(struct trace_event
*event
);
84 /* Return values for print_line callback */
86 TRACE_TYPE_PARTIAL_LINE
= 0, /* Retry after flushing the seq */
87 TRACE_TYPE_HANDLED
= 1,
88 TRACE_TYPE_UNHANDLED
= 2, /* Relay to other output functions */
89 TRACE_TYPE_NO_CONSUME
= 3 /* Handled but ask to not consume */
92 void tracing_generic_entry_update(struct trace_entry
*entry
,
95 struct ring_buffer_event
*
96 trace_current_buffer_lock_reserve(int type
, unsigned long len
,
97 unsigned long flags
, int pc
);
98 void trace_current_buffer_unlock_commit(struct ring_buffer_event
*event
,
99 unsigned long flags
, int pc
);
100 void trace_nowake_buffer_unlock_commit(struct ring_buffer_event
*event
,
101 unsigned long flags
, int pc
);
102 void trace_current_buffer_discard_commit(struct ring_buffer_event
*event
);
104 void tracing_record_cmdline(struct task_struct
*tsk
);
108 struct ftrace_event_call
{
109 struct list_head list
;
113 struct trace_event
*event
;
115 int (*regfunc
)(void *);
116 void (*unregfunc
)(void *);
118 int (*raw_init
)(void);
119 int (*show_format
)(struct ftrace_event_call
*call
,
120 struct trace_seq
*s
);
121 int (*define_fields
)(struct ftrace_event_call
*);
122 struct list_head fields
;
124 struct event_filter
*filter
;
128 atomic_t profile_count
;
129 int (*profile_enable
)(struct ftrace_event_call
*);
130 void (*profile_disable
)(struct ftrace_event_call
*);
133 #define MAX_FILTER_PRED 32
134 #define MAX_FILTER_STR_VAL 128
136 extern void destroy_preds(struct ftrace_event_call
*call
);
137 extern int filter_match_preds(struct ftrace_event_call
*call
, void *rec
);
138 extern int filter_current_check_discard(struct ftrace_event_call
*call
,
140 struct ring_buffer_event
*event
);
144 FILTER_STATIC_STRING
,
149 extern int trace_define_field(struct ftrace_event_call
*call
,
150 const char *type
, const char *name
,
151 int offset
, int size
, int is_signed
,
153 extern int trace_define_common_fields(struct ftrace_event_call
*call
);
155 #define is_signed_type(type) (((type)(-1)) < 0)
157 int trace_set_clr_event(const char *system
, const char *event
, int set
);
160 * The double __builtin_constant_p is because gcc will give us an error
161 * if we try to allocate the static variable to fmt if it is not a
162 * constant. Even with the outer if statement optimizing out.
164 #define event_trace_printk(ip, fmt, args...) \
166 __trace_printk_check_format(fmt, ##args); \
167 tracing_record_cmdline(current); \
168 if (__builtin_constant_p(fmt)) { \
169 static const char *trace_printk_fmt \
170 __attribute__((section("__trace_printk_fmt"))) = \
171 __builtin_constant_p(fmt) ? fmt : NULL; \
173 __trace_bprintk(ip, trace_printk_fmt, ##args); \
175 __trace_printk(ip, fmt, ##args); \
178 #endif /* _LINUX_FTRACE_EVENT_H */