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;
75 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
76 int flags, struct trace_event *event);
78 struct trace_event_functions {
79 trace_print_func trace;
82 trace_print_func binary;
86 struct hlist_node node;
87 struct list_head list;
89 struct trace_event_functions *funcs;
92 extern int register_ftrace_event(struct trace_event *event);
93 extern int unregister_ftrace_event(struct trace_event *event);
95 /* Return values for print_line callback */
97 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
98 TRACE_TYPE_HANDLED = 1,
99 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
100 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
103 void tracing_generic_entry_update(struct trace_entry *entry,
106 struct ring_buffer_event *
107 trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
108 int type, unsigned long len,
109 unsigned long flags, int pc);
110 void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
111 struct ring_buffer_event *event,
112 unsigned long flags, int pc);
113 void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer,
114 struct ring_buffer_event *event,
115 unsigned long flags, int pc);
116 void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
117 struct ring_buffer_event *event);
119 void tracing_record_cmdline(struct task_struct *tsk);
125 TRACE_REG_UNREGISTER,
126 TRACE_REG_PERF_REGISTER,
127 TRACE_REG_PERF_UNREGISTER,
130 struct ftrace_event_call;
132 struct ftrace_event_class {
135 #ifdef CONFIG_PERF_EVENTS
138 int (*reg)(struct ftrace_event_call *event,
139 enum trace_reg type);
140 int (*define_fields)(struct ftrace_event_call *);
141 struct list_head *(*get_fields)(struct ftrace_event_call *);
142 struct list_head fields;
143 int (*raw_init)(struct ftrace_event_call *);
146 struct ftrace_event_call {
147 struct list_head list;
148 struct ftrace_event_class *class;
151 struct trace_event event;
154 const char *print_fmt;
156 struct event_filter *filter;
163 #define PERF_MAX_TRACE_SIZE 2048
165 #define MAX_FILTER_PRED 32
166 #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
168 extern void destroy_preds(struct ftrace_event_call *call);
169 extern int filter_match_preds(struct event_filter *filter, void *rec);
170 extern int filter_current_check_discard(struct ring_buffer *buffer,
171 struct ftrace_event_call *call,
173 struct ring_buffer_event *event);
177 FILTER_STATIC_STRING,
182 extern int trace_event_raw_init(struct ftrace_event_call *call);
183 extern int trace_define_field(struct ftrace_event_call *call, const char *type,
184 const char *name, int offset, int size,
185 int is_signed, int filter_type);
186 extern int trace_add_event_call(struct ftrace_event_call *call);
187 extern void trace_remove_event_call(struct ftrace_event_call *call);
189 #define is_signed_type(type) (((type)(-1)) < 0)
191 int trace_set_clr_event(const char *system, const char *event, int set);
194 * The double __builtin_constant_p is because gcc will give us an error
195 * if we try to allocate the static variable to fmt if it is not a
196 * constant. Even with the outer if statement optimizing out.
198 #define event_trace_printk(ip, fmt, args...) \
200 __trace_printk_check_format(fmt, ##args); \
201 tracing_record_cmdline(current); \
202 if (__builtin_constant_p(fmt)) { \
203 static const char *trace_printk_fmt \
204 __attribute__((section("__trace_printk_fmt"))) = \
205 __builtin_constant_p(fmt) ? fmt : NULL; \
207 __trace_bprintk(ip, trace_printk_fmt, ##args); \
209 __trace_printk(ip, fmt, ##args); \
212 #ifdef CONFIG_PERF_EVENTS
215 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
217 extern int perf_trace_enable(int event_id);
218 extern void perf_trace_disable(int event_id);
219 extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
221 extern void ftrace_profile_free_filter(struct perf_event *event);
223 perf_trace_buf_prepare(int size, unsigned short type, int *rctxp,
224 unsigned long *irq_flags);
227 perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
228 u64 count, unsigned long irq_flags, struct pt_regs *regs)
230 struct trace_entry *entry = raw_data;
232 perf_tp_event(entry->type, addr, count, raw_data, size, regs);
233 perf_swevent_put_recursion_context(rctx);
234 local_irq_restore(irq_flags);
238 #endif /* _LINUX_FTRACE_EVENT_H */