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>
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(struct ring_buffer **current_buffer,
97 int type, unsigned long len,
98 unsigned long flags, int pc);
99 void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
100 struct ring_buffer_event *event,
101 unsigned long flags, int pc);
102 void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer,
103 struct ring_buffer_event *event,
104 unsigned long flags, int pc);
105 void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
106 struct ring_buffer_event *event);
108 void tracing_record_cmdline(struct task_struct *tsk);
112 struct ftrace_event_call {
113 struct list_head list;
117 struct trace_event *event;
119 int (*regfunc)(void *);
120 void (*unregfunc)(void *);
122 int (*raw_init)(void);
123 int (*show_format)(struct ftrace_event_call *call,
124 struct trace_seq *s);
125 int (*define_fields)(struct ftrace_event_call *);
126 struct list_head fields;
128 struct event_filter *filter;
132 atomic_t profile_count;
133 int (*profile_enable)(struct ftrace_event_call *);
134 void (*profile_disable)(struct ftrace_event_call *);
137 #define MAX_FILTER_PRED 32
138 #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
140 extern void destroy_preds(struct ftrace_event_call *call);
141 extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
142 extern int filter_current_check_discard(struct ring_buffer *buffer,
143 struct ftrace_event_call *call,
145 struct ring_buffer_event *event);
149 FILTER_STATIC_STRING,
154 extern int trace_define_field(struct ftrace_event_call *call,
155 const char *type, const char *name,
156 int offset, int size, int is_signed,
158 extern int trace_define_common_fields(struct ftrace_event_call *call);
160 #define is_signed_type(type) (((type)(-1)) < 0)
162 int trace_set_clr_event(const char *system, const char *event, int set);
165 * The double __builtin_constant_p is because gcc will give us an error
166 * if we try to allocate the static variable to fmt if it is not a
167 * constant. Even with the outer if statement optimizing out.
169 #define event_trace_printk(ip, fmt, args...) \
171 __trace_printk_check_format(fmt, ##args); \
172 tracing_record_cmdline(current); \
173 if (__builtin_constant_p(fmt)) { \
174 static const char *trace_printk_fmt \
175 __attribute__((section("__trace_printk_fmt"))) = \
176 __builtin_constant_p(fmt) ? fmt : NULL; \
178 __trace_bprintk(ip, trace_printk_fmt, ##args); \
180 __trace_printk(ip, fmt, ##args); \
183 #endif /* _LINUX_FTRACE_EVENT_H */