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;
76 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
79 struct hlist_node node;
80 struct list_head list;
82 trace_print_func trace;
85 trace_print_func binary;
88 extern int register_ftrace_event(struct trace_event *event);
89 extern int unregister_ftrace_event(struct trace_event *event);
91 /* Return values for print_line callback */
93 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
94 TRACE_TYPE_HANDLED = 1,
95 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
96 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
99 void tracing_generic_entry_update(struct trace_entry *entry,
102 struct ring_buffer_event *
103 trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
104 int type, unsigned long len,
105 unsigned long flags, int pc);
106 void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
107 struct ring_buffer_event *event,
108 unsigned long flags, int pc);
109 void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer,
110 struct ring_buffer_event *event,
111 unsigned long flags, int pc);
112 void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
113 struct ring_buffer_event *event);
115 void tracing_record_cmdline(struct task_struct *tsk);
119 struct ftrace_event_call {
120 struct list_head list;
124 struct trace_event *event;
126 int (*regfunc)(struct ftrace_event_call *);
127 void (*unregfunc)(struct ftrace_event_call *);
129 const char *print_fmt;
130 int (*raw_init)(struct ftrace_event_call *);
131 int (*define_fields)(struct ftrace_event_call *);
132 struct list_head fields;
134 struct event_filter *filter;
139 int (*perf_event_enable)(struct ftrace_event_call *);
140 void (*perf_event_disable)(struct ftrace_event_call *);
143 #define PERF_MAX_TRACE_SIZE 2048
145 #define MAX_FILTER_PRED 32
146 #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
148 extern void destroy_preds(struct ftrace_event_call *call);
149 extern int filter_match_preds(struct event_filter *filter, void *rec);
150 extern int filter_current_check_discard(struct ring_buffer *buffer,
151 struct ftrace_event_call *call,
153 struct ring_buffer_event *event);
157 FILTER_STATIC_STRING,
162 extern int trace_event_raw_init(struct ftrace_event_call *call);
163 extern int trace_define_field(struct ftrace_event_call *call, const char *type,
164 const char *name, int offset, int size,
165 int is_signed, int filter_type);
166 extern int trace_add_event_call(struct ftrace_event_call *call);
167 extern void trace_remove_event_call(struct ftrace_event_call *call);
169 #define is_signed_type(type) (((type)(-1)) < 0)
171 int trace_set_clr_event(const char *system, const char *event, int set);
174 * The double __builtin_constant_p is because gcc will give us an error
175 * if we try to allocate the static variable to fmt if it is not a
176 * constant. Even with the outer if statement optimizing out.
178 #define event_trace_printk(ip, fmt, args...) \
180 __trace_printk_check_format(fmt, ##args); \
181 tracing_record_cmdline(current); \
182 if (__builtin_constant_p(fmt)) { \
183 static const char *trace_printk_fmt \
184 __attribute__((section("__trace_printk_fmt"))) = \
185 __builtin_constant_p(fmt) ? fmt : NULL; \
187 __trace_bprintk(ip, trace_printk_fmt, ##args); \
189 __trace_printk(ip, fmt, ##args); \
192 #ifdef CONFIG_PERF_EVENTS
195 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
197 extern int perf_trace_enable(int event_id);
198 extern void perf_trace_disable(int event_id);
199 extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
201 extern void ftrace_profile_free_filter(struct perf_event *event);
203 perf_trace_buf_prepare(int size, unsigned short type, int *rctxp,
204 unsigned long *irq_flags);
207 perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
208 u64 count, unsigned long irq_flags, struct pt_regs *regs)
210 struct trace_entry *entry = raw_data;
212 perf_tp_event(entry->type, addr, count, raw_data, size, regs);
213 perf_swevent_put_recursion_context(rctx);
214 local_irq_restore(irq_flags);
218 #endif /* _LINUX_FTRACE_EVENT_H */