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
);
28 const char *ftrace_print_hex_seq(struct trace_seq
*p
,
29 const unsigned char *buf
, int len
);
32 * The trace entry - the most basic unit of tracing. This is what
33 * is printed in the end as a single line in the trace output, such as:
35 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
40 unsigned char preempt_count
;
45 #define FTRACE_MAX_EVENT \
46 ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
49 * Trace iterator - used by printout routines who present trace
50 * results to users and which routines might sleep, etc:
52 struct trace_iterator
{
53 struct trace_array
*tr
;
58 struct ring_buffer_iter
*buffer_iter
[NR_CPUS
];
59 unsigned long iter_flags
;
61 /* The below is zeroed out in pipe_read */
63 struct trace_entry
*ent
;
64 unsigned long lost_events
;
72 cpumask_var_t started
;
76 typedef enum print_line_t (*trace_print_func
)(struct trace_iterator
*iter
,
79 struct hlist_node node
;
80 struct list_head list
;
82 trace_print_func trace
;
85 trace_print_func binary
;
88 extern int register_ftrace_event(struct trace_event
*event
);
89 extern int unregister_ftrace_event(struct trace_event
*event
);
91 /* Return values for print_line callback */
93 TRACE_TYPE_PARTIAL_LINE
= 0, /* Retry after flushing the seq */
94 TRACE_TYPE_HANDLED
= 1,
95 TRACE_TYPE_UNHANDLED
= 2, /* Relay to other output functions */
96 TRACE_TYPE_NO_CONSUME
= 3 /* Handled but ask to not consume */
99 void tracing_generic_entry_update(struct trace_entry
*entry
,
102 struct ring_buffer_event
*
103 trace_current_buffer_lock_reserve(struct ring_buffer
**current_buffer
,
104 int type
, unsigned long len
,
105 unsigned long flags
, int pc
);
106 void trace_current_buffer_unlock_commit(struct ring_buffer
*buffer
,
107 struct ring_buffer_event
*event
,
108 unsigned long flags
, int pc
);
109 void trace_nowake_buffer_unlock_commit(struct ring_buffer
*buffer
,
110 struct ring_buffer_event
*event
,
111 unsigned long flags
, int pc
);
112 void trace_current_buffer_discard_commit(struct ring_buffer
*buffer
,
113 struct ring_buffer_event
*event
);
115 void tracing_record_cmdline(struct task_struct
*tsk
);
119 struct ftrace_event_call
{
120 struct list_head list
;
124 struct trace_event
*event
;
126 int (*regfunc
)(struct ftrace_event_call
*);
127 void (*unregfunc
)(struct ftrace_event_call
*);
129 const char *print_fmt
;
130 int (*raw_init
)(struct ftrace_event_call
*);
131 int (*define_fields
)(struct ftrace_event_call
*);
132 struct list_head fields
;
134 struct event_filter
*filter
;
139 int (*perf_event_enable
)(struct ftrace_event_call
*);
140 void (*perf_event_disable
)(struct ftrace_event_call
*);
143 #define PERF_MAX_TRACE_SIZE 2048
145 #define MAX_FILTER_PRED 32
146 #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
148 extern void destroy_preds(struct ftrace_event_call
*call
);
149 extern int filter_match_preds(struct event_filter
*filter
, void *rec
);
150 extern int filter_current_check_discard(struct ring_buffer
*buffer
,
151 struct ftrace_event_call
*call
,
153 struct ring_buffer_event
*event
);
157 FILTER_STATIC_STRING
,
162 extern int trace_event_raw_init(struct ftrace_event_call
*call
);
163 extern int trace_define_field(struct ftrace_event_call
*call
, const char *type
,
164 const char *name
, int offset
, int size
,
165 int is_signed
, int filter_type
);
166 extern int trace_add_event_call(struct ftrace_event_call
*call
);
167 extern void trace_remove_event_call(struct ftrace_event_call
*call
);
169 #define is_signed_type(type) (((type)(-1)) < 0)
171 int trace_set_clr_event(const char *system
, const char *event
, int set
);
174 * The double __builtin_constant_p is because gcc will give us an error
175 * if we try to allocate the static variable to fmt if it is not a
176 * constant. Even with the outer if statement optimizing out.
178 #define event_trace_printk(ip, fmt, args...) \
180 __trace_printk_check_format(fmt, ##args); \
181 tracing_record_cmdline(current); \
182 if (__builtin_constant_p(fmt)) { \
183 static const char *trace_printk_fmt \
184 __attribute__((section("__trace_printk_fmt"))) = \
185 __builtin_constant_p(fmt) ? fmt : NULL; \
187 __trace_bprintk(ip, trace_printk_fmt, ##args); \
189 __trace_printk(ip, fmt, ##args); \
192 #ifdef CONFIG_PERF_EVENTS
195 DECLARE_PER_CPU(struct pt_regs
, perf_trace_regs
);
197 extern int perf_trace_enable(int event_id
);
198 extern void perf_trace_disable(int event_id
);
199 extern int ftrace_profile_set_filter(struct perf_event
*event
, int event_id
,
201 extern void ftrace_profile_free_filter(struct perf_event
*event
);
203 perf_trace_buf_prepare(int size
, unsigned short type
, int *rctxp
,
204 unsigned long *irq_flags
);
207 perf_trace_buf_submit(void *raw_data
, int size
, int rctx
, u64 addr
,
208 u64 count
, unsigned long irq_flags
, struct pt_regs
*regs
)
210 struct trace_entry
*entry
= raw_data
;
212 perf_tp_event(entry
->type
, addr
, count
, raw_data
, size
, regs
);
213 perf_swevent_put_recursion_context(rctx
);
214 local_irq_restore(irq_flags
);
218 #endif /* _LINUX_FTRACE_EVENT_H */