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;
61 unsigned long lost_events;
69 cpumask_var_t started;
73 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
76 struct hlist_node node;
77 struct list_head list;
79 trace_print_func trace;
82 trace_print_func binary;
85 extern int register_ftrace_event(struct trace_event *event);
86 extern int unregister_ftrace_event(struct trace_event *event);
88 /* Return values for print_line callback */
90 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
91 TRACE_TYPE_HANDLED = 1,
92 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
93 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
96 void tracing_generic_entry_update(struct trace_entry *entry,
99 struct ring_buffer_event *
100 trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
101 int type, unsigned long len,
102 unsigned long flags, int pc);
103 void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
104 struct ring_buffer_event *event,
105 unsigned long flags, int pc);
106 void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer,
107 struct ring_buffer_event *event,
108 unsigned long flags, int pc);
109 void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
110 struct ring_buffer_event *event);
112 void tracing_record_cmdline(struct task_struct *tsk);
116 struct ftrace_event_call {
117 struct list_head list;
121 struct trace_event *event;
123 int (*regfunc)(struct ftrace_event_call *);
124 void (*unregfunc)(struct ftrace_event_call *);
126 const char *print_fmt;
127 int (*raw_init)(struct ftrace_event_call *);
128 int (*define_fields)(struct ftrace_event_call *);
129 struct list_head fields;
131 struct event_filter *filter;
137 int (*perf_event_enable)(struct ftrace_event_call *);
138 void (*perf_event_disable)(struct ftrace_event_call *);
141 #define PERF_MAX_TRACE_SIZE 2048
143 #define MAX_FILTER_PRED 32
144 #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
146 extern void destroy_preds(struct ftrace_event_call *call);
147 extern int filter_match_preds(struct event_filter *filter, void *rec);
148 extern int filter_current_check_discard(struct ring_buffer *buffer,
149 struct ftrace_event_call *call,
151 struct ring_buffer_event *event);
155 FILTER_STATIC_STRING,
160 extern int trace_event_raw_init(struct ftrace_event_call *call);
161 extern int trace_define_field(struct ftrace_event_call *call, const char *type,
162 const char *name, int offset, int size,
163 int is_signed, int filter_type);
164 extern int trace_add_event_call(struct ftrace_event_call *call);
165 extern void trace_remove_event_call(struct ftrace_event_call *call);
167 #define is_signed_type(type) (((type)(-1)) < 0)
169 int trace_set_clr_event(const char *system, const char *event, int set);
172 * The double __builtin_constant_p is because gcc will give us an error
173 * if we try to allocate the static variable to fmt if it is not a
174 * constant. Even with the outer if statement optimizing out.
176 #define event_trace_printk(ip, fmt, args...) \
178 __trace_printk_check_format(fmt, ##args); \
179 tracing_record_cmdline(current); \
180 if (__builtin_constant_p(fmt)) { \
181 static const char *trace_printk_fmt \
182 __attribute__((section("__trace_printk_fmt"))) = \
183 __builtin_constant_p(fmt) ? fmt : NULL; \
185 __trace_bprintk(ip, trace_printk_fmt, ##args); \
187 __trace_printk(ip, fmt, ##args); \
190 #ifdef CONFIG_PERF_EVENTS
193 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
195 extern int perf_trace_enable(int event_id, void *data);
196 extern void perf_trace_disable(int event_id);
197 extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
199 extern void ftrace_profile_free_filter(struct perf_event *event);
201 perf_trace_buf_prepare(int size, unsigned short type, int *rctxp,
202 unsigned long *irq_flags);
205 perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
206 u64 count, unsigned long irq_flags, struct pt_regs *regs,
209 struct trace_entry *entry = raw_data;
211 perf_tp_event(entry->type, addr, count, raw_data, size, regs, event);
212 perf_swevent_put_recursion_context(rctx);
213 local_irq_restore(irq_flags);
217 #endif /* _LINUX_FTRACE_EVENT_H */