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
10 struct trace_array;
11 struct tracer;
12 struct dentry;
13
14 struct trace_print_flags {
15 unsigned long mask;
16 const char *name;
17 };
18
19 struct trace_print_flags_u64 {
20 unsigned long long mask;
21 const char *name;
22 };
23
24 const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
25 unsigned long flags,
26 const struct trace_print_flags *flag_array);
27
28 const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
29 const struct trace_print_flags *symbol_array);
30
31 #if BITS_PER_LONG == 32
32 const char *ftrace_print_symbols_seq_u64(struct trace_seq *p,
33 unsigned long long val,
34 const struct trace_print_flags_u64
35 *symbol_array);
36 #endif
37
38 const char *ftrace_print_hex_seq(struct trace_seq *p,
39 const unsigned char *buf, int len);
40
41 /*
42 * The trace entry - the most basic unit of tracing. This is what
43 * is printed in the end as a single line in the trace output, such as:
44 *
45 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
46 */
47 struct trace_entry {
48 unsigned short type;
49 unsigned char flags;
50 unsigned char preempt_count;
51 int pid;
52 int padding;
53 };
54
55 #define FTRACE_MAX_EVENT \
56 ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
57
58 /*
59 * Trace iterator - used by printout routines who present trace
60 * results to users and which routines might sleep, etc:
61 */
62 struct trace_iterator {
63 struct trace_array *tr;
64 struct tracer *trace;
65 void *private;
66 int cpu_file;
67 struct mutex mutex;
68 struct ring_buffer_iter *buffer_iter[NR_CPUS];
69 unsigned long iter_flags;
70
71 /* trace_seq for __print_flags() and __print_symbolic() etc. */
72 struct trace_seq tmp_seq;
73
74 /* The below is zeroed out in pipe_read */
75 struct trace_seq seq;
76 struct trace_entry *ent;
77 unsigned long lost_events;
78 int leftover;
79 int ent_size;
80 int cpu;
81 u64 ts;
82
83 loff_t pos;
84 long idx;
85
86 cpumask_var_t started;
87 };
88
89
90 struct trace_event;
91
92 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
93 int flags, struct trace_event *event);
94
95 struct trace_event_functions {
96 trace_print_func trace;
97 trace_print_func raw;
98 trace_print_func hex;
99 trace_print_func binary;
100 };
101
102 struct trace_event {
103 struct hlist_node node;
104 struct list_head list;
105 int type;
106 struct trace_event_functions *funcs;
107 };
108
109 extern int register_ftrace_event(struct trace_event *event);
110 extern int unregister_ftrace_event(struct trace_event *event);
111
112 /* Return values for print_line callback */
113 enum print_line_t {
114 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
115 TRACE_TYPE_HANDLED = 1,
116 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
117 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
118 };
119
120 void tracing_generic_entry_update(struct trace_entry *entry,
121 unsigned long flags,
122 int pc);
123 struct ring_buffer_event *
124 trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
125 int type, unsigned long len,
126 unsigned long flags, int pc);
127 void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
128 struct ring_buffer_event *event,
129 unsigned long flags, int pc);
130 void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer,
131 struct ring_buffer_event *event,
132 unsigned long flags, int pc);
133 void trace_nowake_buffer_unlock_commit_regs(struct ring_buffer *buffer,
134 struct ring_buffer_event *event,
135 unsigned long flags, int pc,
136 struct pt_regs *regs);
137 void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
138 struct ring_buffer_event *event);
139
140 void tracing_record_cmdline(struct task_struct *tsk);
141
142 struct event_filter;
143
144 enum trace_reg {
145 TRACE_REG_REGISTER,
146 TRACE_REG_UNREGISTER,
147 TRACE_REG_PERF_REGISTER,
148 TRACE_REG_PERF_UNREGISTER,
149 };
150
151 struct ftrace_event_call;
152
153 struct ftrace_event_class {
154 char *system;
155 void *probe;
156 #ifdef CONFIG_PERF_EVENTS
157 void *perf_probe;
158 #endif
159 int (*reg)(struct ftrace_event_call *event,
160 enum trace_reg type);
161 int (*define_fields)(struct ftrace_event_call *);
162 struct list_head *(*get_fields)(struct ftrace_event_call *);
163 struct list_head fields;
164 int (*raw_init)(struct ftrace_event_call *);
165 };
166
167 extern int ftrace_event_reg(struct ftrace_event_call *event,
168 enum trace_reg type);
169
170 enum {
171 TRACE_EVENT_FL_ENABLED_BIT,
172 TRACE_EVENT_FL_FILTERED_BIT,
173 TRACE_EVENT_FL_RECORDED_CMD_BIT,
174 TRACE_EVENT_FL_CAP_ANY_BIT,
175 TRACE_EVENT_FL_NO_SET_FILTER_BIT,
176 };
177
178 enum {
179 TRACE_EVENT_FL_ENABLED = (1 << TRACE_EVENT_FL_ENABLED_BIT),
180 TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
181 TRACE_EVENT_FL_RECORDED_CMD = (1 << TRACE_EVENT_FL_RECORDED_CMD_BIT),
182 TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
183 TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
184 };
185
186 struct ftrace_event_call {
187 struct list_head list;
188 struct ftrace_event_class *class;
189 char *name;
190 struct dentry *dir;
191 struct trace_event event;
192 const char *print_fmt;
193 struct event_filter *filter;
194 void *mod;
195 void *data;
196
197 /*
198 * 32 bit flags:
199 * bit 1: enabled
200 * bit 2: filter_active
201 * bit 3: enabled cmd record
202 *
203 * Changes to flags must hold the event_mutex.
204 *
205 * Note: Reads of flags do not hold the event_mutex since
206 * they occur in critical sections. But the way flags
207 * is currently used, these changes do no affect the code
208 * except that when a change is made, it may have a slight
209 * delay in propagating the changes to other CPUs due to
210 * caching and such.
211 */
212 unsigned int flags;
213
214 #ifdef CONFIG_PERF_EVENTS
215 int perf_refcount;
216 struct hlist_head __percpu *perf_events;
217 #endif
218 };
219
220 #define __TRACE_EVENT_FLAGS(name, value) \
221 static int __init trace_init_flags_##name(void) \
222 { \
223 event_##name.flags = value; \
224 return 0; \
225 } \
226 early_initcall(trace_init_flags_##name);
227
228 #define PERF_MAX_TRACE_SIZE 2048
229
230 #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
231
232 extern void destroy_preds(struct ftrace_event_call *call);
233 extern int filter_match_preds(struct event_filter *filter, void *rec);
234 extern int filter_current_check_discard(struct ring_buffer *buffer,
235 struct ftrace_event_call *call,
236 void *rec,
237 struct ring_buffer_event *event);
238
239 enum {
240 FILTER_OTHER = 0,
241 FILTER_STATIC_STRING,
242 FILTER_DYN_STRING,
243 FILTER_PTR_STRING,
244 };
245
246 #define EVENT_STORAGE_SIZE 128
247 extern struct mutex event_storage_mutex;
248 extern char event_storage[EVENT_STORAGE_SIZE];
249
250 extern int trace_event_raw_init(struct ftrace_event_call *call);
251 extern int trace_define_field(struct ftrace_event_call *call, const char *type,
252 const char *name, int offset, int size,
253 int is_signed, int filter_type);
254 extern int trace_add_event_call(struct ftrace_event_call *call);
255 extern void trace_remove_event_call(struct ftrace_event_call *call);
256
257 #define is_signed_type(type) (((type)(-1)) < 0)
258
259 int trace_set_clr_event(const char *system, const char *event, int set);
260
261 /*
262 * The double __builtin_constant_p is because gcc will give us an error
263 * if we try to allocate the static variable to fmt if it is not a
264 * constant. Even with the outer if statement optimizing out.
265 */
266 #define event_trace_printk(ip, fmt, args...) \
267 do { \
268 __trace_printk_check_format(fmt, ##args); \
269 tracing_record_cmdline(current); \
270 if (__builtin_constant_p(fmt)) { \
271 static const char *trace_printk_fmt \
272 __attribute__((section("__trace_printk_fmt"))) = \
273 __builtin_constant_p(fmt) ? fmt : NULL; \
274 \
275 __trace_bprintk(ip, trace_printk_fmt, ##args); \
276 } else \
277 __trace_printk(ip, fmt, ##args); \
278 } while (0)
279
280 #ifdef CONFIG_PERF_EVENTS
281 struct perf_event;
282
283 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
284
285 extern int perf_trace_init(struct perf_event *event);
286 extern void perf_trace_destroy(struct perf_event *event);
287 extern int perf_trace_add(struct perf_event *event, int flags);
288 extern void perf_trace_del(struct perf_event *event, int flags);
289 extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
290 char *filter_str);
291 extern void ftrace_profile_free_filter(struct perf_event *event);
292 extern void *perf_trace_buf_prepare(int size, unsigned short type,
293 struct pt_regs *regs, int *rctxp);
294
295 static inline void
perf_trace_buf_submit(void * raw_data,int size,int rctx,u64 addr,u64 count,struct pt_regs * regs,void * head)296 perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
297 u64 count, struct pt_regs *regs, void *head)
298 {
299 perf_tp_event(addr, count, raw_data, size, regs, head, rctx);
300 }
301 #endif
302
303 #endif /* _LINUX_FTRACE_EVENT_H */
304