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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 | DECLARE_PER_CPU(struct trace_seq, ftrace_event_seq); |
15 | ||
16 | struct trace_print_flags { | |
17 | unsigned long mask; | |
18 | const char *name; | |
19 | }; | |
20 | ||
21 | const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim, | |
22 | unsigned long flags, | |
23 | const struct trace_print_flags *flag_array); | |
24 | ||
0f4fc29d SR |
25 | const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val, |
26 | const struct trace_print_flags *symbol_array); | |
27 | ||
97f20251 SR |
28 | /* |
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: | |
31 | * | |
32 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
33 | */ | |
34 | struct trace_entry { | |
89ec0dee | 35 | unsigned short type; |
97f20251 SR |
36 | unsigned char flags; |
37 | unsigned char preempt_count; | |
38 | int pid; | |
637e7e86 | 39 | int lock_depth; |
97f20251 SR |
40 | }; |
41 | ||
89ec0dee SR |
42 | #define FTRACE_MAX_EVENT \ |
43 | ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1) | |
44 | ||
97f20251 SR |
45 | /* |
46 | * Trace iterator - used by printout routines who present trace | |
47 | * results to users and which routines might sleep, etc: | |
48 | */ | |
49 | struct trace_iterator { | |
50 | struct trace_array *tr; | |
51 | struct tracer *trace; | |
52 | void *private; | |
53 | int cpu_file; | |
54 | struct mutex mutex; | |
55 | struct ring_buffer_iter *buffer_iter[NR_CPUS]; | |
112f38a7 | 56 | unsigned long iter_flags; |
97f20251 SR |
57 | |
58 | /* The below is zeroed out in pipe_read */ | |
59 | struct trace_seq seq; | |
60 | struct trace_entry *ent; | |
bc21b478 | 61 | unsigned long lost_events; |
a63ce5b3 | 62 | int leftover; |
97f20251 SR |
63 | int cpu; |
64 | u64 ts; | |
65 | ||
97f20251 SR |
66 | loff_t pos; |
67 | long idx; | |
68 | ||
69 | cpumask_var_t started; | |
70 | }; | |
71 | ||
72 | ||
73 | typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter, | |
74 | int flags); | |
75 | struct trace_event { | |
76 | struct hlist_node node; | |
060fa5c8 | 77 | struct list_head list; |
97f20251 SR |
78 | int type; |
79 | trace_print_func trace; | |
80 | trace_print_func raw; | |
81 | trace_print_func hex; | |
82 | trace_print_func binary; | |
83 | }; | |
84 | ||
85 | extern int register_ftrace_event(struct trace_event *event); | |
86 | extern int unregister_ftrace_event(struct trace_event *event); | |
87 | ||
88 | /* Return values for print_line callback */ | |
89 | enum print_line_t { | |
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 */ | |
94 | }; | |
95 | ||
f413cdb8 FW |
96 | void tracing_generic_entry_update(struct trace_entry *entry, |
97 | unsigned long flags, | |
98 | int pc); | |
97f20251 | 99 | struct ring_buffer_event * |
e77405ad SR |
100 | trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer, |
101 | int type, unsigned long len, | |
97f20251 | 102 | unsigned long flags, int pc); |
e77405ad SR |
103 | void trace_current_buffer_unlock_commit(struct ring_buffer *buffer, |
104 | struct ring_buffer_event *event, | |
97f20251 | 105 | unsigned long flags, int pc); |
e77405ad SR |
106 | void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer, |
107 | struct ring_buffer_event *event, | |
97f20251 | 108 | unsigned long flags, int pc); |
e77405ad SR |
109 | void trace_current_buffer_discard_commit(struct ring_buffer *buffer, |
110 | struct ring_buffer_event *event); | |
97f20251 SR |
111 | |
112 | void tracing_record_cmdline(struct task_struct *tsk); | |
113 | ||
1f9963cb LZ |
114 | struct event_filter; |
115 | ||
97f20251 | 116 | struct ftrace_event_call { |
a59fd602 | 117 | struct list_head list; |
97f20251 SR |
118 | char *name; |
119 | char *system; | |
120 | struct dentry *dir; | |
6d723736 | 121 | struct trace_event *event; |
97f20251 | 122 | int enabled; |
bd1a5c84 MH |
123 | int (*regfunc)(struct ftrace_event_call *); |
124 | void (*unregfunc)(struct ftrace_event_call *); | |
97f20251 | 125 | int id; |
509e760c | 126 | const char *print_fmt; |
bd1a5c84 | 127 | int (*raw_init)(struct ftrace_event_call *); |
14be96c9 | 128 | int (*define_fields)(struct ftrace_event_call *); |
97f20251 | 129 | struct list_head fields; |
30e673b2 | 130 | int filter_active; |
1f9963cb | 131 | struct event_filter *filter; |
6d723736 | 132 | void *mod; |
69fd4f0e | 133 | void *data; |
97f20251 | 134 | |
97d5a220 | 135 | int perf_refcount; |
1c024eca | 136 | struct hlist_head *perf_events; |
97d5a220 FW |
137 | int (*perf_event_enable)(struct ftrace_event_call *); |
138 | void (*perf_event_disable)(struct ftrace_event_call *); | |
97f20251 SR |
139 | }; |
140 | ||
97d5a220 | 141 | #define PERF_MAX_TRACE_SIZE 2048 |
20ab4425 | 142 | |
8b372562 | 143 | #define MAX_FILTER_PRED 32 |
16bb8eb1 | 144 | #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */ |
97f20251 | 145 | |
2df75e41 | 146 | extern void destroy_preds(struct ftrace_event_call *call); |
6fb2915d | 147 | extern int filter_match_preds(struct event_filter *filter, void *rec); |
e77405ad SR |
148 | extern int filter_current_check_discard(struct ring_buffer *buffer, |
149 | struct ftrace_event_call *call, | |
97f20251 SR |
150 | void *rec, |
151 | struct ring_buffer_event *event); | |
152 | ||
43b51ead LZ |
153 | enum { |
154 | FILTER_OTHER = 0, | |
155 | FILTER_STATIC_STRING, | |
156 | FILTER_DYN_STRING, | |
87a342f5 | 157 | FILTER_PTR_STRING, |
43b51ead LZ |
158 | }; |
159 | ||
87d9b4e1 | 160 | extern int trace_event_raw_init(struct ftrace_event_call *call); |
aeaeae11 FW |
161 | extern int trace_define_field(struct ftrace_event_call *call, const char *type, |
162 | const char *name, int offset, int size, | |
163 | int is_signed, int filter_type); | |
bd1a5c84 MH |
164 | extern int trace_add_event_call(struct ftrace_event_call *call); |
165 | extern void trace_remove_event_call(struct ftrace_event_call *call); | |
97f20251 | 166 | |
a118e4d1 | 167 | #define is_signed_type(type) (((type)(-1)) < 0) |
97f20251 | 168 | |
4671c794 SR |
169 | int trace_set_clr_event(const char *system, const char *event, int set); |
170 | ||
97f20251 SR |
171 | /* |
172 | * The double __builtin_constant_p is because gcc will give us an error | |
173 | * if we try to allocate the static variable to fmt if it is not a | |
174 | * constant. Even with the outer if statement optimizing out. | |
175 | */ | |
176 | #define event_trace_printk(ip, fmt, args...) \ | |
177 | do { \ | |
178 | __trace_printk_check_format(fmt, ##args); \ | |
179 | tracing_record_cmdline(current); \ | |
180 | if (__builtin_constant_p(fmt)) { \ | |
181 | static const char *trace_printk_fmt \ | |
182 | __attribute__((section("__trace_printk_fmt"))) = \ | |
183 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
184 | \ | |
185 | __trace_bprintk(ip, trace_printk_fmt, ##args); \ | |
186 | } else \ | |
187 | __trace_printk(ip, fmt, ##args); \ | |
188 | } while (0) | |
189 | ||
07b139c8 | 190 | #ifdef CONFIG_PERF_EVENTS |
6fb2915d | 191 | struct perf_event; |
c530665c FW |
192 | |
193 | DECLARE_PER_CPU(struct pt_regs, perf_trace_regs); | |
194 | ||
1c024eca PZ |
195 | extern int perf_trace_init(struct perf_event *event); |
196 | extern void perf_trace_destroy(struct perf_event *event); | |
197 | extern int perf_trace_enable(struct perf_event *event); | |
198 | extern void perf_trace_disable(struct perf_event *event); | |
199 | extern int ftrace_profile_set_filter(struct perf_event *event, int event_id, | |
6fb2915d LZ |
200 | char *filter_str); |
201 | extern void ftrace_profile_free_filter(struct perf_event *event); | |
b7e2ecef PZ |
202 | extern void *perf_trace_buf_prepare(int size, unsigned short type, |
203 | struct pt_regs *regs, int *rctxp); | |
430ad5a6 XG |
204 | |
205 | static inline void | |
97d5a220 | 206 | perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr, |
1c024eca | 207 | u64 count, struct pt_regs *regs, void *head) |
430ad5a6 | 208 | { |
1c024eca | 209 | perf_tp_event(addr, count, raw_data, size, regs, head); |
430ad5a6 | 210 | perf_swevent_put_recursion_context(rctx); |
430ad5a6 | 211 | } |
6fb2915d LZ |
212 | #endif |
213 | ||
97f20251 | 214 | #endif /* _LINUX_FTRACE_EVENT_H */ |