1 #ifndef _LINUX_FTRACE_EVENT_H
2 #define _LINUX_FTRACE_EVENT_H
4 #include <linux/trace_seq.h>
5 #include <linux/ring_buffer.h>
12 * The trace entry - the most basic unit of tracing. This is what
13 * is printed in the end as a single line in the trace output, such as:
15 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
20 unsigned char preempt_count;
26 * Trace iterator - used by printout routines who present trace
27 * results to users and which routines might sleep, etc:
29 struct trace_iterator {
30 struct trace_array *tr;
35 struct ring_buffer_iter *buffer_iter[NR_CPUS];
37 /* The below is zeroed out in pipe_read */
39 struct trace_entry *ent;
43 unsigned long iter_flags;
47 cpumask_var_t started;
51 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
54 struct hlist_node node;
56 trace_print_func trace;
59 trace_print_func binary;
62 extern int register_ftrace_event(struct trace_event *event);
63 extern int unregister_ftrace_event(struct trace_event *event);
65 /* Return values for print_line callback */
67 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
68 TRACE_TYPE_HANDLED = 1,
69 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
70 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
74 struct ring_buffer_event *
75 trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
76 unsigned long flags, int pc);
77 void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
78 unsigned long flags, int pc);
79 void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
80 unsigned long flags, int pc);
81 void trace_current_buffer_discard_commit(struct ring_buffer_event *event);
83 void tracing_record_cmdline(struct task_struct *tsk);
85 struct ftrace_event_call {
91 void (*unregfunc)(void);
93 int (*raw_init)(void);
94 int (*show_format)(struct trace_seq *s);
95 int (*define_fields)(void);
96 struct list_head fields;
98 struct filter_pred **preds;
100 #ifdef CONFIG_EVENT_PROFILE
101 atomic_t profile_count;
102 int (*profile_enable)(struct ftrace_event_call *);
103 void (*profile_disable)(struct ftrace_event_call *);
107 #define MAX_FILTER_PRED 8
108 #define MAX_FILTER_STR_VAL 128
110 extern int init_preds(struct ftrace_event_call *call);
111 extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
112 extern int filter_current_check_discard(struct ftrace_event_call *call,
114 struct ring_buffer_event *event);
116 extern int trace_define_field(struct ftrace_event_call *call, char *type,
117 char *name, int offset, int size);
121 * The double __builtin_constant_p is because gcc will give us an error
122 * if we try to allocate the static variable to fmt if it is not a
123 * constant. Even with the outer if statement optimizing out.
125 #define event_trace_printk(ip, fmt, args...) \
127 __trace_printk_check_format(fmt, ##args); \
128 tracing_record_cmdline(current); \
129 if (__builtin_constant_p(fmt)) { \
130 static const char *trace_printk_fmt \
131 __attribute__((section("__trace_printk_fmt"))) = \
132 __builtin_constant_p(fmt) ? fmt : NULL; \
134 __trace_bprintk(ip, trace_printk_fmt, ##args); \
136 __trace_printk(ip, fmt, ##args); \
139 #define __common_field(type, item) \
140 ret = trace_define_field(event_call, #type, "common_" #item, \
141 offsetof(typeof(field.ent), item), \
142 sizeof(field.ent.item)); \
146 #endif /* _LINUX_FTRACE_EVENT_H */