Commit | Line | Data |
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97f20251 SR |
1 | #ifndef _LINUX_FTRACE_EVENT_H |
2 | #define _LINUX_FTRACE_EVENT_H | |
3 | ||
97f20251 | 4 | #include <linux/ring_buffer.h> |
16bb8eb1 | 5 | #include <linux/trace_seq.h> |
be74b73a | 6 | #include <linux/percpu.h> |
20ab4425 | 7 | #include <linux/hardirq.h> |
430ad5a6 | 8 | #include <linux/perf_event.h> |
97f20251 SR |
9 | |
10 | struct trace_array; | |
11 | struct tracer; | |
6d723736 | 12 | struct dentry; |
97f20251 | 13 | |
be74b73a SR |
14 | struct trace_print_flags { |
15 | unsigned long mask; | |
16 | const char *name; | |
17 | }; | |
18 | ||
2fc1b6f0 | 19 | struct trace_print_flags_u64 { |
20 | unsigned long long mask; | |
21 | const char *name; | |
22 | }; | |
23 | ||
be74b73a SR |
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 | ||
0f4fc29d SR |
28 | const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val, |
29 | const struct trace_print_flags *symbol_array); | |
30 | ||
2fc1b6f0 | 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 | ||
5a2e3995 KT |
38 | const char *ftrace_print_hex_seq(struct trace_seq *p, |
39 | const unsigned char *buf, int len); | |
40 | ||
97f20251 SR |
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 { | |
89ec0dee | 48 | unsigned short type; |
97f20251 SR |
49 | unsigned char flags; |
50 | unsigned char preempt_count; | |
51 | int pid; | |
a3a4a5ac | 52 | int padding; |
97f20251 SR |
53 | }; |
54 | ||
89ec0dee SR |
55 | #define FTRACE_MAX_EVENT \ |
56 | ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1) | |
57 | ||
97f20251 SR |
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; | |
6d158a81 | 68 | struct ring_buffer_iter **buffer_iter; |
112f38a7 | 69 | unsigned long iter_flags; |
97f20251 | 70 | |
bc289ae9 LJ |
71 | /* trace_seq for __print_flags() and __print_symbolic() etc. */ |
72 | struct trace_seq tmp_seq; | |
73 | ||
97f20251 SR |
74 | /* The below is zeroed out in pipe_read */ |
75 | struct trace_seq seq; | |
76 | struct trace_entry *ent; | |
bc21b478 | 77 | unsigned long lost_events; |
a63ce5b3 | 78 | int leftover; |
4a9bd3f1 | 79 | int ent_size; |
97f20251 SR |
80 | int cpu; |
81 | u64 ts; | |
82 | ||
97f20251 SR |
83 | loff_t pos; |
84 | long idx; | |
85 | ||
86 | cpumask_var_t started; | |
87 | }; | |
88 | ||
89 | ||
a9a57763 SR |
90 | struct trace_event; |
91 | ||
97f20251 | 92 | typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter, |
a9a57763 SR |
93 | int flags, struct trace_event *event); |
94 | ||
95 | struct trace_event_functions { | |
97f20251 SR |
96 | trace_print_func trace; |
97 | trace_print_func raw; | |
98 | trace_print_func hex; | |
99 | trace_print_func binary; | |
100 | }; | |
101 | ||
a9a57763 SR |
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 | ||
97f20251 SR |
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 | ||
f413cdb8 FW |
120 | void tracing_generic_entry_update(struct trace_entry *entry, |
121 | unsigned long flags, | |
122 | int pc); | |
97f20251 | 123 | struct ring_buffer_event * |
e77405ad SR |
124 | trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer, |
125 | int type, unsigned long len, | |
97f20251 | 126 | unsigned long flags, int pc); |
e77405ad SR |
127 | void trace_current_buffer_unlock_commit(struct ring_buffer *buffer, |
128 | struct ring_buffer_event *event, | |
97f20251 | 129 | unsigned long flags, int pc); |
e77405ad SR |
130 | void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer, |
131 | struct ring_buffer_event *event, | |
97f20251 | 132 | unsigned long flags, int pc); |
1fd8df2c MH |
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); | |
e77405ad SR |
137 | void trace_current_buffer_discard_commit(struct ring_buffer *buffer, |
138 | struct ring_buffer_event *event); | |
97f20251 SR |
139 | |
140 | void tracing_record_cmdline(struct task_struct *tsk); | |
141 | ||
1f9963cb LZ |
142 | struct event_filter; |
143 | ||
2239291a SR |
144 | enum trace_reg { |
145 | TRACE_REG_REGISTER, | |
146 | TRACE_REG_UNREGISTER, | |
37d73998 | 147 | #ifdef CONFIG_PERF_EVENTS |
2239291a SR |
148 | TRACE_REG_PERF_REGISTER, |
149 | TRACE_REG_PERF_UNREGISTER, | |
ceec0b6f JO |
150 | TRACE_REG_PERF_OPEN, |
151 | TRACE_REG_PERF_CLOSE, | |
489c75c3 JO |
152 | TRACE_REG_PERF_ADD, |
153 | TRACE_REG_PERF_DEL, | |
37d73998 | 154 | #endif |
2239291a SR |
155 | }; |
156 | ||
157 | struct ftrace_event_call; | |
158 | ||
8f082018 SR |
159 | struct ftrace_event_class { |
160 | char *system; | |
2239291a SR |
161 | void *probe; |
162 | #ifdef CONFIG_PERF_EVENTS | |
163 | void *perf_probe; | |
164 | #endif | |
165 | int (*reg)(struct ftrace_event_call *event, | |
ceec0b6f | 166 | enum trace_reg type, void *data); |
2e33af02 SR |
167 | int (*define_fields)(struct ftrace_event_call *); |
168 | struct list_head *(*get_fields)(struct ftrace_event_call *); | |
169 | struct list_head fields; | |
0405ab80 | 170 | int (*raw_init)(struct ftrace_event_call *); |
8f082018 SR |
171 | }; |
172 | ||
a1d0ce82 | 173 | extern int ftrace_event_reg(struct ftrace_event_call *event, |
ceec0b6f | 174 | enum trace_reg type, void *data); |
a1d0ce82 | 175 | |
553552ce SR |
176 | enum { |
177 | TRACE_EVENT_FL_ENABLED_BIT, | |
178 | TRACE_EVENT_FL_FILTERED_BIT, | |
e870e9a1 | 179 | TRACE_EVENT_FL_RECORDED_CMD_BIT, |
61c32659 | 180 | TRACE_EVENT_FL_CAP_ANY_BIT, |
27b14b56 | 181 | TRACE_EVENT_FL_NO_SET_FILTER_BIT, |
9b63776f | 182 | TRACE_EVENT_FL_IGNORE_ENABLE_BIT, |
553552ce SR |
183 | }; |
184 | ||
185 | enum { | |
e870e9a1 LZ |
186 | TRACE_EVENT_FL_ENABLED = (1 << TRACE_EVENT_FL_ENABLED_BIT), |
187 | TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT), | |
188 | TRACE_EVENT_FL_RECORDED_CMD = (1 << TRACE_EVENT_FL_RECORDED_CMD_BIT), | |
61c32659 | 189 | TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT), |
27b14b56 | 190 | TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT), |
9b63776f | 191 | TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT), |
553552ce SR |
192 | }; |
193 | ||
97f20251 | 194 | struct ftrace_event_call { |
a59fd602 | 195 | struct list_head list; |
8f082018 | 196 | struct ftrace_event_class *class; |
97f20251 | 197 | char *name; |
97f20251 | 198 | struct dentry *dir; |
80decc70 | 199 | struct trace_event event; |
509e760c | 200 | const char *print_fmt; |
1f9963cb | 201 | struct event_filter *filter; |
6d723736 | 202 | void *mod; |
69fd4f0e | 203 | void *data; |
97f20251 | 204 | |
553552ce SR |
205 | /* |
206 | * 32 bit flags: | |
207 | * bit 1: enabled | |
208 | * bit 2: filter_active | |
e870e9a1 | 209 | * bit 3: enabled cmd record |
5da43bed SR |
210 | * bit 4: allow trace by non root (cap any) |
211 | * bit 5: failed to apply filter | |
212 | * bit 6: ftrace internal event (do not enable) | |
553552ce | 213 | * |
1eaa4787 SR |
214 | * Changes to flags must hold the event_mutex. |
215 | * | |
216 | * Note: Reads of flags do not hold the event_mutex since | |
217 | * they occur in critical sections. But the way flags | |
218 | * is currently used, these changes do no affect the code | |
219 | * except that when a change is made, it may have a slight | |
220 | * delay in propagating the changes to other CPUs due to | |
221 | * caching and such. | |
553552ce SR |
222 | */ |
223 | unsigned int flags; | |
224 | ||
ff5f149b | 225 | #ifdef CONFIG_PERF_EVENTS |
6016ee13 NK |
226 | int perf_refcount; |
227 | struct hlist_head __percpu *perf_events; | |
ff5f149b | 228 | #endif |
97f20251 SR |
229 | }; |
230 | ||
53cf810b FW |
231 | #define __TRACE_EVENT_FLAGS(name, value) \ |
232 | static int __init trace_init_flags_##name(void) \ | |
233 | { \ | |
234 | event_##name.flags = value; \ | |
235 | return 0; \ | |
236 | } \ | |
237 | early_initcall(trace_init_flags_##name); | |
238 | ||
97d5a220 | 239 | #define PERF_MAX_TRACE_SIZE 2048 |
20ab4425 | 240 | |
16bb8eb1 | 241 | #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */ |
97f20251 | 242 | |
2df75e41 | 243 | extern void destroy_preds(struct ftrace_event_call *call); |
6fb2915d | 244 | extern int filter_match_preds(struct event_filter *filter, void *rec); |
e77405ad SR |
245 | extern int filter_current_check_discard(struct ring_buffer *buffer, |
246 | struct ftrace_event_call *call, | |
97f20251 SR |
247 | void *rec, |
248 | struct ring_buffer_event *event); | |
249 | ||
43b51ead LZ |
250 | enum { |
251 | FILTER_OTHER = 0, | |
252 | FILTER_STATIC_STRING, | |
253 | FILTER_DYN_STRING, | |
87a342f5 | 254 | FILTER_PTR_STRING, |
02aa3162 | 255 | FILTER_TRACE_FN, |
43b51ead LZ |
256 | }; |
257 | ||
04295780 SR |
258 | #define EVENT_STORAGE_SIZE 128 |
259 | extern struct mutex event_storage_mutex; | |
260 | extern char event_storage[EVENT_STORAGE_SIZE]; | |
261 | ||
87d9b4e1 | 262 | extern int trace_event_raw_init(struct ftrace_event_call *call); |
aeaeae11 FW |
263 | extern int trace_define_field(struct ftrace_event_call *call, const char *type, |
264 | const char *name, int offset, int size, | |
265 | int is_signed, int filter_type); | |
bd1a5c84 MH |
266 | extern int trace_add_event_call(struct ftrace_event_call *call); |
267 | extern void trace_remove_event_call(struct ftrace_event_call *call); | |
97f20251 | 268 | |
a118e4d1 | 269 | #define is_signed_type(type) (((type)(-1)) < 0) |
97f20251 | 270 | |
4671c794 SR |
271 | int trace_set_clr_event(const char *system, const char *event, int set); |
272 | ||
97f20251 SR |
273 | /* |
274 | * The double __builtin_constant_p is because gcc will give us an error | |
275 | * if we try to allocate the static variable to fmt if it is not a | |
276 | * constant. Even with the outer if statement optimizing out. | |
277 | */ | |
278 | #define event_trace_printk(ip, fmt, args...) \ | |
279 | do { \ | |
280 | __trace_printk_check_format(fmt, ##args); \ | |
281 | tracing_record_cmdline(current); \ | |
282 | if (__builtin_constant_p(fmt)) { \ | |
283 | static const char *trace_printk_fmt \ | |
284 | __attribute__((section("__trace_printk_fmt"))) = \ | |
285 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
286 | \ | |
287 | __trace_bprintk(ip, trace_printk_fmt, ##args); \ | |
288 | } else \ | |
289 | __trace_printk(ip, fmt, ##args); \ | |
290 | } while (0) | |
291 | ||
07b139c8 | 292 | #ifdef CONFIG_PERF_EVENTS |
6fb2915d | 293 | struct perf_event; |
c530665c FW |
294 | |
295 | DECLARE_PER_CPU(struct pt_regs, perf_trace_regs); | |
296 | ||
1c024eca PZ |
297 | extern int perf_trace_init(struct perf_event *event); |
298 | extern void perf_trace_destroy(struct perf_event *event); | |
a4eaf7f1 PZ |
299 | extern int perf_trace_add(struct perf_event *event, int flags); |
300 | extern void perf_trace_del(struct perf_event *event, int flags); | |
1c024eca | 301 | extern int ftrace_profile_set_filter(struct perf_event *event, int event_id, |
6fb2915d LZ |
302 | char *filter_str); |
303 | extern void ftrace_profile_free_filter(struct perf_event *event); | |
b7e2ecef PZ |
304 | extern void *perf_trace_buf_prepare(int size, unsigned short type, |
305 | struct pt_regs *regs, int *rctxp); | |
430ad5a6 XG |
306 | |
307 | static inline void | |
97d5a220 | 308 | perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr, |
e6dab5ff AV |
309 | u64 count, struct pt_regs *regs, void *head, |
310 | struct task_struct *task) | |
430ad5a6 | 311 | { |
e6dab5ff | 312 | perf_tp_event(addr, count, raw_data, size, regs, head, rctx, task); |
430ad5a6 | 313 | } |
6fb2915d LZ |
314 | #endif |
315 | ||
97f20251 | 316 | #endif /* _LINUX_FTRACE_EVENT_H */ |