1 #ifndef _LINUX_FTRACE_EVENT_H
2 #define _LINUX_FTRACE_EVENT_H
4 #include <linux/trace_seq.h>
5 #include <linux/ring_buffer.h>
13 * The trace entry - the most basic unit of tracing. This is what
14 * is printed in the end as a single line in the trace output, such as:
16 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
21 unsigned char preempt_count;
27 * Trace iterator - used by printout routines who present trace
28 * results to users and which routines might sleep, etc:
30 struct trace_iterator {
31 struct trace_array *tr;
36 struct ring_buffer_iter *buffer_iter[NR_CPUS];
38 /* The below is zeroed out in pipe_read */
40 struct trace_entry *ent;
44 unsigned long iter_flags;
48 cpumask_var_t started;
52 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
55 struct hlist_node node;
57 trace_print_func trace;
60 trace_print_func binary;
63 extern int register_ftrace_event(struct trace_event *event);
64 extern int unregister_ftrace_event(struct trace_event *event);
66 /* Return values for print_line callback */
68 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
69 TRACE_TYPE_HANDLED = 1,
70 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
71 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
75 struct ring_buffer_event *
76 trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
77 unsigned long flags, int pc);
78 void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
79 unsigned long flags, int pc);
80 void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
81 unsigned long flags, int pc);
82 void trace_current_buffer_discard_commit(struct ring_buffer_event *event);
84 void tracing_record_cmdline(struct task_struct *tsk);
86 struct ftrace_event_call {
87 struct list_head list;
91 struct trace_event *event;
94 void (*unregfunc)(void);
96 int (*raw_init)(void);
97 int (*show_format)(struct trace_seq *s);
98 int (*define_fields)(void);
99 struct list_head fields;
101 struct filter_pred **preds;
104 #ifdef CONFIG_EVENT_PROFILE
105 atomic_t profile_count;
106 int (*profile_enable)(struct ftrace_event_call *);
107 void (*profile_disable)(struct ftrace_event_call *);
111 #define MAX_FILTER_PRED 8
112 #define MAX_FILTER_STR_VAL 128
114 extern int init_preds(struct ftrace_event_call *call);
115 extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
116 extern int filter_current_check_discard(struct ftrace_event_call *call,
118 struct ring_buffer_event *event);
120 extern int trace_define_field(struct ftrace_event_call *call, char *type,
121 char *name, int offset, int size);
125 * The double __builtin_constant_p is because gcc will give us an error
126 * if we try to allocate the static variable to fmt if it is not a
127 * constant. Even with the outer if statement optimizing out.
129 #define event_trace_printk(ip, fmt, args...) \
131 __trace_printk_check_format(fmt, ##args); \
132 tracing_record_cmdline(current); \
133 if (__builtin_constant_p(fmt)) { \
134 static const char *trace_printk_fmt \
135 __attribute__((section("__trace_printk_fmt"))) = \
136 __builtin_constant_p(fmt) ? fmt : NULL; \
138 __trace_bprintk(ip, trace_printk_fmt, ##args); \
140 __trace_printk(ip, fmt, ##args); \
143 #define __common_field(type, item) \
144 ret = trace_define_field(event_call, #type, "common_" #item, \
145 offsetof(typeof(field.ent), item), \
146 sizeof(field.ent.item)); \
150 #endif /* _LINUX_FTRACE_EVENT_H */