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);
118 TRACE_REG_UNREGISTER,
119 TRACE_REG_PERF_REGISTER,
120 TRACE_REG_PERF_UNREGISTER,
123 struct ftrace_event_call;
125 struct ftrace_event_class {
128 #ifdef CONFIG_PERF_EVENTS
131 int (*reg)(struct ftrace_event_call *event,
132 enum trace_reg type);
133 int (*define_fields)(struct ftrace_event_call *);
134 struct list_head *(*get_fields)(struct ftrace_event_call *);
135 struct list_head fields;
138 struct ftrace_event_call {
139 struct list_head list;
140 struct ftrace_event_class *class;
143 struct trace_event *event;
146 const char *print_fmt;
147 int (*raw_init)(struct ftrace_event_call *);
149 struct event_filter *filter;
156 #define PERF_MAX_TRACE_SIZE 2048
158 #define MAX_FILTER_PRED 32
159 #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
161 extern void destroy_preds(struct ftrace_event_call *call);
162 extern int filter_match_preds(struct event_filter *filter, void *rec);
163 extern int filter_current_check_discard(struct ring_buffer *buffer,
164 struct ftrace_event_call *call,
166 struct ring_buffer_event *event);
170 FILTER_STATIC_STRING,
175 extern int trace_event_raw_init(struct ftrace_event_call *call);
176 extern int trace_define_field(struct ftrace_event_call *call, const char *type,
177 const char *name, int offset, int size,
178 int is_signed, int filter_type);
179 extern int trace_add_event_call(struct ftrace_event_call *call);
180 extern void trace_remove_event_call(struct ftrace_event_call *call);
182 #define is_signed_type(type) (((type)(-1)) < 0)
184 int trace_set_clr_event(const char *system, const char *event, int set);
187 * The double __builtin_constant_p is because gcc will give us an error
188 * if we try to allocate the static variable to fmt if it is not a
189 * constant. Even with the outer if statement optimizing out.
191 #define event_trace_printk(ip, fmt, args...) \
193 __trace_printk_check_format(fmt, ##args); \
194 tracing_record_cmdline(current); \
195 if (__builtin_constant_p(fmt)) { \
196 static const char *trace_printk_fmt \
197 __attribute__((section("__trace_printk_fmt"))) = \
198 __builtin_constant_p(fmt) ? fmt : NULL; \
200 __trace_bprintk(ip, trace_printk_fmt, ##args); \
202 __trace_printk(ip, fmt, ##args); \
205 #ifdef CONFIG_PERF_EVENTS
208 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
210 extern int perf_trace_enable(int event_id);
211 extern void perf_trace_disable(int event_id);
212 extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
214 extern void ftrace_profile_free_filter(struct perf_event *event);
216 perf_trace_buf_prepare(int size, unsigned short type, int *rctxp,
217 unsigned long *irq_flags);
220 perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
221 u64 count, unsigned long irq_flags, struct pt_regs *regs)
223 struct trace_entry *entry = raw_data;
225 perf_tp_event(entry->type, addr, count, raw_data, size, regs);
226 perf_swevent_put_recursion_context(rctx);
227 local_irq_restore(irq_flags);
231 #endif /* _LINUX_FTRACE_EVENT_H */