ftrace_event.h 6.11 KB
Newer Older
1
2
3
4
#ifndef _LINUX_FTRACE_EVENT_H
#define _LINUX_FTRACE_EVENT_H

#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>
9
10
11

struct trace_array;
struct tracer;
12
struct dentry;
13

14
15
16
17
18
19
20
21
22
23
24
DECLARE_PER_CPU(struct trace_seq, ftrace_event_seq);

struct trace_print_flags {
	unsigned long		mask;
	const char		*name;
};

const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
				   unsigned long flags,
				   const struct trace_print_flags *flag_array);

25
26
27
const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
				     const struct trace_print_flags *symbol_array);

28
29
30
31
32
33
34
/*
 * The trace entry - the most basic unit of tracing. This is what
 * is printed in the end as a single line in the trace output, such as:
 *
 *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
 */
struct trace_entry {
35
	unsigned short		type;
36
37
38
	unsigned char		flags;
	unsigned char		preempt_count;
	int			pid;
39
	int			lock_depth;
40
41
};

42
43
44
#define FTRACE_MAX_EVENT						\
	((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)

45
46
47
48
49
50
51
52
53
54
55
/*
 * Trace iterator - used by printout routines who present trace
 * results to users and which routines might sleep, etc:
 */
struct trace_iterator {
	struct trace_array	*tr;
	struct tracer		*trace;
	void			*private;
	int			cpu_file;
	struct mutex		mutex;
	struct ring_buffer_iter	*buffer_iter[NR_CPUS];
56
	unsigned long		iter_flags;
57
58
59
60

	/* The below is zeroed out in pipe_read */
	struct trace_seq	seq;
	struct trace_entry	*ent;
61
	unsigned long		lost_events;
62
	int			leftover;
63
64
65
66
67
68
69
70
71
72
73
74
75
76
	int			cpu;
	u64			ts;

	loff_t			pos;
	long			idx;

	cpumask_var_t		started;
};


typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
					      int flags);
struct trace_event {
	struct hlist_node	node;
77
	struct list_head	list;
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
	int			type;
	trace_print_func	trace;
	trace_print_func	raw;
	trace_print_func	hex;
	trace_print_func	binary;
};

extern int register_ftrace_event(struct trace_event *event);
extern int unregister_ftrace_event(struct trace_event *event);

/* Return values for print_line callback */
enum print_line_t {
	TRACE_TYPE_PARTIAL_LINE	= 0,	/* Retry after flushing the seq */
	TRACE_TYPE_HANDLED	= 1,
	TRACE_TYPE_UNHANDLED	= 2,	/* Relay to other output functions */
	TRACE_TYPE_NO_CONSUME	= 3	/* Handled but ask to not consume */
};

96
97
98
void tracing_generic_entry_update(struct trace_entry *entry,
				  unsigned long flags,
				  int pc);
99
struct ring_buffer_event *
100
101
trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
				  int type, unsigned long len,
102
				  unsigned long flags, int pc);
103
104
void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
					struct ring_buffer_event *event,
105
					unsigned long flags, int pc);
106
107
void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer,
				       struct ring_buffer_event *event,
108
					unsigned long flags, int pc);
109
110
void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
					 struct ring_buffer_event *event);
111
112
113

void tracing_record_cmdline(struct task_struct *tsk);

114
115
struct event_filter;

116
struct ftrace_event_call {
117
	struct list_head	list;
118
119
120
	char			*name;
	char			*system;
	struct dentry		*dir;
121
	struct trace_event	*event;
122
	int			enabled;
123
124
	int			(*regfunc)(struct ftrace_event_call *);
	void			(*unregfunc)(struct ftrace_event_call *);
125
	int			id;
Lai Jiangshan's avatar
Lai Jiangshan committed
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;
130
	int			filter_active;
131
	struct event_filter	*filter;
132
	void			*mod;
133
	void			*data;
134

135
	int			perf_refcount;
136
	void			*perf_data;
137
138
	int			(*perf_event_enable)(struct ftrace_event_call *);
	void			(*perf_event_disable)(struct ftrace_event_call *);
139
140
};

141
#define PERF_MAX_TRACE_SIZE	2048
142

143
#define MAX_FILTER_PRED		32
144
#define MAX_FILTER_STR_VAL	256	/* Should handle KSYM_SYMBOL_LEN */
145

146
extern void destroy_preds(struct ftrace_event_call *call);
Li Zefan's avatar
Li Zefan committed
147
extern int filter_match_preds(struct event_filter *filter, void *rec);
148
149
extern int filter_current_check_discard(struct ring_buffer *buffer,
					struct ftrace_event_call *call,
150
151
152
					void *rec,
					struct ring_buffer_event *event);

153
154
155
156
enum {
	FILTER_OTHER = 0,
	FILTER_STATIC_STRING,
	FILTER_DYN_STRING,
157
	FILTER_PTR_STRING,
158
159
};

160
extern int trace_event_raw_init(struct ftrace_event_call *call);
161
162
163
extern int trace_define_field(struct ftrace_event_call *call, const char *type,
			      const char *name, int offset, int size,
			      int is_signed, int filter_type);
164
165
extern int trace_add_event_call(struct ftrace_event_call *call);
extern void trace_remove_event_call(struct ftrace_event_call *call);
166

167
#define is_signed_type(type)	(((type)(-1)) < 0)
168

169
170
int trace_set_clr_event(const char *system, const char *event, int set);

171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
/*
 * The double __builtin_constant_p is because gcc will give us an error
 * if we try to allocate the static variable to fmt if it is not a
 * constant. Even with the outer if statement optimizing out.
 */
#define event_trace_printk(ip, fmt, args...)				\
do {									\
	__trace_printk_check_format(fmt, ##args);			\
	tracing_record_cmdline(current);				\
	if (__builtin_constant_p(fmt)) {				\
		static const char *trace_printk_fmt			\
		  __attribute__((section("__trace_printk_fmt"))) =	\
			__builtin_constant_p(fmt) ? fmt : NULL;		\
									\
		__trace_bprintk(ip, trace_printk_fmt, ##args);		\
	} else								\
		__trace_printk(ip, fmt, ##args);			\
} while (0)

190
#ifdef CONFIG_PERF_EVENTS
Li Zefan's avatar
Li Zefan committed
191
struct perf_event;
192
193
194

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);
Li Zefan's avatar
Li Zefan committed
197
198
199
extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
				     char *filter_str);
extern void ftrace_profile_free_filter(struct perf_event *event);
200
201
extern void *perf_trace_buf_prepare(int size, unsigned short type,
				    struct pt_regs *regs, int *rctxp);
202
203

static inline void
204
perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
205
		       u64 count, struct pt_regs *regs, void *event)
206
207
208
{
	struct trace_entry *entry = raw_data;

209
	perf_tp_event(entry->type, addr, count, raw_data, size, regs, event);
210
211
	perf_swevent_put_recursion_context(rctx);
}
Li Zefan's avatar
Li Zefan committed
212
213
#endif

214
#endif /* _LINUX_FTRACE_EVENT_H */