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1#ifndef _LINUX_FTRACE_EVENT_H
2#define _LINUX_FTRACE_EVENT_H
3
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>
9
10struct trace_array;
11struct tracer;
12struct dentry;
13
14struct trace_print_flags {
15 unsigned long mask;
16 const char *name;
17};
18
19const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
20 unsigned long flags,
21 const struct trace_print_flags *flag_array);
22
23const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
24 const struct trace_print_flags *symbol_array);
25
26const char *ftrace_print_hex_seq(struct trace_seq *p,
27 const unsigned char *buf, int len);
28
29/*
30 * The trace entry - the most basic unit of tracing. This is what
31 * is printed in the end as a single line in the trace output, such as:
32 *
33 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
34 */
35struct trace_entry {
36 unsigned short type;
37 unsigned char flags;
38 unsigned char preempt_count;
39 int pid;
40 int lock_depth;
41};
42
43#define FTRACE_MAX_EVENT \
44 ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
45
46/*
47 * Trace iterator - used by printout routines who present trace
48 * results to users and which routines might sleep, etc:
49 */
50struct trace_iterator {
51 struct trace_array *tr;
52 struct tracer *trace;
53 void *private;
54 int cpu_file;
55 struct mutex mutex;
56 struct ring_buffer_iter *buffer_iter[NR_CPUS];
57 unsigned long iter_flags;
58
59 /* trace_seq for __print_flags() and __print_symbolic() etc. */
60 struct trace_seq tmp_seq;
61
62 /* The below is zeroed out in pipe_read */
63 struct trace_seq seq;
64 struct trace_entry *ent;
65 unsigned long lost_events;
66 int leftover;
67 int cpu;
68 u64 ts;
69
70 loff_t pos;
71 long idx;
72
73 cpumask_var_t started;
74};
75
76
77struct trace_event;
78
79typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
80 int flags, struct trace_event *event);
81
82struct trace_event_functions {
83 trace_print_func trace;
84 trace_print_func raw;
85 trace_print_func hex;
86 trace_print_func binary;
87};
88
89struct trace_event {
90 struct hlist_node node;
91 struct list_head list;
92 int type;
93 struct trace_event_functions *funcs;
94};
95
96extern int register_ftrace_event(struct trace_event *event);
97extern int unregister_ftrace_event(struct trace_event *event);
98
99/* Return values for print_line callback */
100enum print_line_t {
101 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
102 TRACE_TYPE_HANDLED = 1,
103 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
104 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
105};
106
107void tracing_generic_entry_update(struct trace_entry *entry,
108 unsigned long flags,
109 int pc);
110struct ring_buffer_event *
111trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
112 int type, unsigned long len,
113 unsigned long flags, int pc);
114void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
115 struct ring_buffer_event *event,
116 unsigned long flags, int pc);
117void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer,
118 struct ring_buffer_event *event,
119 unsigned long flags, int pc);
120void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
121 struct ring_buffer_event *event);
122
123void tracing_record_cmdline(struct task_struct *tsk);
124
125struct event_filter;
126
127enum trace_reg {
128 TRACE_REG_REGISTER,
129 TRACE_REG_UNREGISTER,
130 TRACE_REG_PERF_REGISTER,
131 TRACE_REG_PERF_UNREGISTER,
132};
133
134struct ftrace_event_call;
135
136struct ftrace_event_class {
137 char *system;
138 void *probe;
139#ifdef CONFIG_PERF_EVENTS
140 void *perf_probe;
141#endif
142 int (*reg)(struct ftrace_event_call *event,
143 enum trace_reg type);
144 int (*define_fields)(struct ftrace_event_call *);
145 struct list_head *(*get_fields)(struct ftrace_event_call *);
146 struct list_head fields;
147 int (*raw_init)(struct ftrace_event_call *);
148};
149
150extern int ftrace_event_reg(struct ftrace_event_call *event,
151 enum trace_reg type);
152
153enum {
154 TRACE_EVENT_FL_ENABLED_BIT,
155 TRACE_EVENT_FL_FILTERED_BIT,
156 TRACE_EVENT_FL_RECORDED_CMD_BIT,
157};
158
159enum {
160 TRACE_EVENT_FL_ENABLED = (1 << TRACE_EVENT_FL_ENABLED_BIT),
161 TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
162 TRACE_EVENT_FL_RECORDED_CMD = (1 << TRACE_EVENT_FL_RECORDED_CMD_BIT),
163};
164
165struct ftrace_event_call {
166 struct list_head list;
167 struct ftrace_event_class *class;
168 char *name;
169 struct dentry *dir;
170 struct trace_event event;
171 const char *print_fmt;
172 struct event_filter *filter;
173 void *mod;
174 void *data;
175
176 /*
177 * 32 bit flags:
178 * bit 1: enabled
179 * bit 2: filter_active
180 * bit 3: enabled cmd record
181 *
182 * Changes to flags must hold the event_mutex.
183 *
184 * Note: Reads of flags do not hold the event_mutex since
185 * they occur in critical sections. But the way flags
186 * is currently used, these changes do no affect the code
187 * except that when a change is made, it may have a slight
188 * delay in propagating the changes to other CPUs due to
189 * caching and such.
190 */
191 unsigned int flags;
192
193#ifdef CONFIG_PERF_EVENTS
194 int perf_refcount;
195 struct hlist_head __percpu *perf_events;
196#endif
197};
198
199#define PERF_MAX_TRACE_SIZE 2048
200
201#define MAX_FILTER_PRED 32
202#define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
203
204extern void destroy_preds(struct ftrace_event_call *call);
205extern int filter_match_preds(struct event_filter *filter, void *rec);
206extern int filter_current_check_discard(struct ring_buffer *buffer,
207 struct ftrace_event_call *call,
208 void *rec,
209 struct ring_buffer_event *event);
210
211enum {
212 FILTER_OTHER = 0,
213 FILTER_STATIC_STRING,
214 FILTER_DYN_STRING,
215 FILTER_PTR_STRING,
216};
217
218extern int trace_event_raw_init(struct ftrace_event_call *call);
219extern int trace_define_field(struct ftrace_event_call *call, const char *type,
220 const char *name, int offset, int size,
221 int is_signed, int filter_type);
222extern int trace_add_event_call(struct ftrace_event_call *call);
223extern void trace_remove_event_call(struct ftrace_event_call *call);
224
225#define is_signed_type(type) (((type)(-1)) < 0)
226
227int trace_set_clr_event(const char *system, const char *event, int set);
228
229/*
230 * The double __builtin_constant_p is because gcc will give us an error
231 * if we try to allocate the static variable to fmt if it is not a
232 * constant. Even with the outer if statement optimizing out.
233 */
234#define event_trace_printk(ip, fmt, args...) \
235do { \
236 __trace_printk_check_format(fmt, ##args); \
237 tracing_record_cmdline(current); \
238 if (__builtin_constant_p(fmt)) { \
239 static const char *trace_printk_fmt \
240 __attribute__((section("__trace_printk_fmt"))) = \
241 __builtin_constant_p(fmt) ? fmt : NULL; \
242 \
243 __trace_bprintk(ip, trace_printk_fmt, ##args); \
244 } else \
245 __trace_printk(ip, fmt, ##args); \
246} while (0)
247
248#ifdef CONFIG_PERF_EVENTS
249struct perf_event;
250
251DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
252
253extern int perf_trace_init(struct perf_event *event);
254extern void perf_trace_destroy(struct perf_event *event);
255extern int perf_trace_add(struct perf_event *event, int flags);
256extern void perf_trace_del(struct perf_event *event, int flags);
257extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
258 char *filter_str);
259extern void ftrace_profile_free_filter(struct perf_event *event);
260extern void *perf_trace_buf_prepare(int size, unsigned short type,
261 struct pt_regs *regs, int *rctxp);
262
263static inline void
264perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
265 u64 count, struct pt_regs *regs, void *head)
266{
267 perf_tp_event(addr, count, raw_data, size, regs, head, rctx);
268}
269#endif
270
271#endif /* _LINUX_FTRACE_EVENT_H */