1 #ifndef _LINUX_FTRACE_EVENT_H
2 #define _LINUX_FTRACE_EVENT_H
4 #include <linux/ring_buffer.h>
5 #include <linux/trace_seq.h>
6 #include <linux/percpu.h>
7 #include <linux/hardirq.h>
8 #include <linux/perf_event.h>
14 DECLARE_PER_CPU(struct trace_seq
, ftrace_event_seq
);
16 struct trace_print_flags
{
21 const char *ftrace_print_flags_seq(struct trace_seq
*p
, const char *delim
,
23 const struct trace_print_flags
*flag_array
);
25 const char *ftrace_print_symbols_seq(struct trace_seq
*p
, unsigned long val
,
26 const struct trace_print_flags
*symbol_array
);
29 * The trace entry - the most basic unit of tracing. This is what
30 * is printed in the end as a single line in the trace output, such as:
32 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
37 unsigned char preempt_count
;
42 #define FTRACE_MAX_EVENT \
43 ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
46 * Trace iterator - used by printout routines who present trace
47 * results to users and which routines might sleep, etc:
49 struct trace_iterator
{
50 struct trace_array
*tr
;
55 struct ring_buffer_iter
*buffer_iter
[NR_CPUS
];
56 unsigned long iter_flags
;
58 /* The below is zeroed out in pipe_read */
60 struct trace_entry
*ent
;
68 cpumask_var_t started
;
72 typedef enum print_line_t (*trace_print_func
)(struct trace_iterator
*iter
,
75 struct hlist_node node
;
76 struct list_head list
;
78 trace_print_func trace
;
81 trace_print_func binary
;
84 extern int register_ftrace_event(struct trace_event
*event
);
85 extern int unregister_ftrace_event(struct trace_event
*event
);
87 /* Return values for print_line callback */
89 TRACE_TYPE_PARTIAL_LINE
= 0, /* Retry after flushing the seq */
90 TRACE_TYPE_HANDLED
= 1,
91 TRACE_TYPE_UNHANDLED
= 2, /* Relay to other output functions */
92 TRACE_TYPE_NO_CONSUME
= 3 /* Handled but ask to not consume */
95 void tracing_generic_entry_update(struct trace_entry
*entry
,
98 struct ring_buffer_event
*
99 trace_current_buffer_lock_reserve(struct ring_buffer
**current_buffer
,
100 int type
, unsigned long len
,
101 unsigned long flags
, int pc
);
102 void trace_current_buffer_unlock_commit(struct ring_buffer
*buffer
,
103 struct ring_buffer_event
*event
,
104 unsigned long flags
, int pc
);
105 void trace_nowake_buffer_unlock_commit(struct ring_buffer
*buffer
,
106 struct ring_buffer_event
*event
,
107 unsigned long flags
, int pc
);
108 void trace_current_buffer_discard_commit(struct ring_buffer
*buffer
,
109 struct ring_buffer_event
*event
);
111 void tracing_record_cmdline(struct task_struct
*tsk
);
115 struct ftrace_event_call
{
116 struct list_head list
;
120 struct trace_event
*event
;
122 int (*regfunc
)(struct ftrace_event_call
*);
123 void (*unregfunc
)(struct ftrace_event_call
*);
125 int (*raw_init
)(struct ftrace_event_call
*);
126 int (*show_format
)(struct ftrace_event_call
*,
128 int (*define_fields
)(struct ftrace_event_call
*);
129 struct list_head fields
;
131 struct event_filter
*filter
;
136 int (*profile_enable
)(struct ftrace_event_call
*);
137 void (*profile_disable
)(struct ftrace_event_call
*);
140 #define FTRACE_MAX_PROFILE_SIZE 2048
142 #define MAX_FILTER_PRED 32
143 #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
145 extern void destroy_preds(struct ftrace_event_call
*call
);
146 extern int filter_match_preds(struct event_filter
*filter
, void *rec
);
147 extern int filter_current_check_discard(struct ring_buffer
*buffer
,
148 struct ftrace_event_call
*call
,
150 struct ring_buffer_event
*event
);
154 FILTER_STATIC_STRING
,
159 extern int trace_event_raw_init(struct ftrace_event_call
*call
);
160 extern int trace_define_field(struct ftrace_event_call
*call
, const char *type
,
161 const char *name
, int offset
, int size
,
162 int is_signed
, int filter_type
);
163 extern int trace_add_event_call(struct ftrace_event_call
*call
);
164 extern void trace_remove_event_call(struct ftrace_event_call
*call
);
166 #define is_signed_type(type) (((type)(-1)) < 0)
168 int trace_set_clr_event(const char *system
, const char *event
, int set
);
171 * The double __builtin_constant_p is because gcc will give us an error
172 * if we try to allocate the static variable to fmt if it is not a
173 * constant. Even with the outer if statement optimizing out.
175 #define event_trace_printk(ip, fmt, args...) \
177 __trace_printk_check_format(fmt, ##args); \
178 tracing_record_cmdline(current); \
179 if (__builtin_constant_p(fmt)) { \
180 static const char *trace_printk_fmt \
181 __attribute__((section("__trace_printk_fmt"))) = \
182 __builtin_constant_p(fmt) ? fmt : NULL; \
184 __trace_bprintk(ip, trace_printk_fmt, ##args); \
186 __trace_printk(ip, fmt, ##args); \
189 #ifdef CONFIG_PERF_EVENTS
191 extern int ftrace_profile_enable(int event_id
);
192 extern void ftrace_profile_disable(int event_id
);
193 extern int ftrace_profile_set_filter(struct perf_event
*event
, int event_id
,
195 extern void ftrace_profile_free_filter(struct perf_event
*event
);
197 ftrace_perf_buf_prepare(int size
, unsigned short type
, int *rctxp
,
198 unsigned long *irq_flags
);
201 ftrace_perf_buf_submit(void *raw_data
, int size
, int rctx
, u64 addr
,
202 u64 count
, unsigned long irq_flags
)
204 struct trace_entry
*entry
= raw_data
;
206 perf_tp_event(entry
->type
, addr
, count
, raw_data
, size
);
207 perf_swevent_put_recursion_context(rctx
);
208 local_irq_restore(irq_flags
);
212 #endif /* _LINUX_FTRACE_EVENT_H */
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