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);
28 const char *ftrace_print_hex_seq(struct trace_seq *p,
29 const unsigned char *buf, int len);
32 * The trace entry - the most basic unit of tracing. This is what
33 * is printed in the end as a single line in the trace output, such as:
35 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
40 unsigned char preempt_count;
45 #define FTRACE_MAX_EVENT \
46 ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
49 * Trace iterator - used by printout routines who present trace
50 * results to users and which routines might sleep, etc:
52 struct trace_iterator {
53 struct trace_array *tr;
58 struct ring_buffer_iter *buffer_iter[NR_CPUS];
59 unsigned long iter_flags;
61 /* The below is zeroed out in pipe_read */
63 struct trace_entry *ent;
64 unsigned long lost_events;
72 cpumask_var_t started;
78 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
79 int flags, struct trace_event *event);
81 struct trace_event_functions {
82 trace_print_func trace;
85 trace_print_func binary;
89 struct hlist_node node;
90 struct list_head list;
92 struct trace_event_functions *funcs;
95 extern int register_ftrace_event(struct trace_event *event);
96 extern int unregister_ftrace_event(struct trace_event *event);
98 /* Return values for print_line callback */
100 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
101 TRACE_TYPE_HANDLED = 1,
102 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
103 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
106 void tracing_generic_entry_update(struct trace_entry *entry,
109 struct ring_buffer_event *
110 trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
111 int type, unsigned long len,
112 unsigned long flags, int pc);
113 void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
114 struct ring_buffer_event *event,
115 unsigned long flags, int pc);
116 void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer,
117 struct ring_buffer_event *event,
118 unsigned long flags, int pc);
119 void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
120 struct ring_buffer_event *event);
122 void tracing_record_cmdline(struct task_struct *tsk);
128 TRACE_REG_UNREGISTER,
129 TRACE_REG_PERF_REGISTER,
130 TRACE_REG_PERF_UNREGISTER,
133 struct ftrace_event_call;
135 struct ftrace_event_class {
138 #ifdef CONFIG_PERF_EVENTS
141 int (*reg)(struct ftrace_event_call *event,
142 enum trace_reg type);
143 int (*define_fields)(struct ftrace_event_call *);
144 struct list_head *(*get_fields)(struct ftrace_event_call *);
145 struct list_head fields;
146 int (*raw_init)(struct ftrace_event_call *);
150 TRACE_EVENT_FL_ENABLED_BIT,
151 TRACE_EVENT_FL_FILTERED_BIT,
155 TRACE_EVENT_FL_ENABLED = (1 << TRACE_EVENT_FL_ENABLED_BIT),
156 TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
159 struct ftrace_event_call {
160 struct list_head list;
161 struct ftrace_event_class *class;
164 struct trace_event event;
165 const char *print_fmt;
166 struct event_filter *filter;
173 * bit 2: filter_active
175 * Changes to flags must hold the event_mutex.
177 * Note: Reads of flags do not hold the event_mutex since
178 * they occur in critical sections. But the way flags
179 * is currently used, these changes do no affect the code
180 * except that when a change is made, it may have a slight
181 * delay in propagating the changes to other CPUs due to
186 #ifdef CONFIG_PERF_EVENTS
188 struct hlist_head *perf_events;
192 #define PERF_MAX_TRACE_SIZE 2048
194 #define MAX_FILTER_PRED 32
195 #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
197 extern void destroy_preds(struct ftrace_event_call *call);
198 extern int filter_match_preds(struct event_filter *filter, void *rec);
199 extern int filter_current_check_discard(struct ring_buffer *buffer,
200 struct ftrace_event_call *call,
202 struct ring_buffer_event *event);
206 FILTER_STATIC_STRING,
211 extern int trace_event_raw_init(struct ftrace_event_call *call);
212 extern int trace_define_field(struct ftrace_event_call *call, const char *type,
213 const char *name, int offset, int size,
214 int is_signed, int filter_type);
215 extern int trace_add_event_call(struct ftrace_event_call *call);
216 extern void trace_remove_event_call(struct ftrace_event_call *call);
218 #define is_signed_type(type) (((type)(-1)) < 0)
220 int trace_set_clr_event(const char *system, const char *event, int set);
223 * The double __builtin_constant_p is because gcc will give us an error
224 * if we try to allocate the static variable to fmt if it is not a
225 * constant. Even with the outer if statement optimizing out.
227 #define event_trace_printk(ip, fmt, args...) \
229 __trace_printk_check_format(fmt, ##args); \
230 tracing_record_cmdline(current); \
231 if (__builtin_constant_p(fmt)) { \
232 static const char *trace_printk_fmt \
233 __attribute__((section("__trace_printk_fmt"))) = \
234 __builtin_constant_p(fmt) ? fmt : NULL; \
236 __trace_bprintk(ip, trace_printk_fmt, ##args); \
238 __trace_printk(ip, fmt, ##args); \
241 #ifdef CONFIG_PERF_EVENTS
244 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
246 extern int perf_trace_init(struct perf_event *event);
247 extern void perf_trace_destroy(struct perf_event *event);
248 extern int perf_trace_enable(struct perf_event *event);
249 extern void perf_trace_disable(struct perf_event *event);
250 extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
252 extern void ftrace_profile_free_filter(struct perf_event *event);
253 extern void *perf_trace_buf_prepare(int size, unsigned short type,
254 struct pt_regs *regs, int *rctxp);
257 perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
258 u64 count, struct pt_regs *regs, void *head)
260 perf_tp_event(addr, count, raw_data, size, regs, head);
261 perf_swevent_put_recursion_context(rctx);
265 #endif /* _LINUX_FTRACE_EVENT_H */