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97f20251 SR |
1 | #ifndef _LINUX_FTRACE_EVENT_H |
2 | #define _LINUX_FTRACE_EVENT_H | |
3 | ||
4 | #include <linux/trace_seq.h> | |
5 | #include <linux/ring_buffer.h> | |
be74b73a | 6 | #include <linux/percpu.h> |
97f20251 SR |
7 | |
8 | struct trace_array; | |
9 | struct tracer; | |
6d723736 | 10 | struct dentry; |
97f20251 | 11 | |
be74b73a SR |
12 | DECLARE_PER_CPU(struct trace_seq, ftrace_event_seq); |
13 | ||
14 | struct trace_print_flags { | |
15 | unsigned long mask; | |
16 | const char *name; | |
17 | }; | |
18 | ||
19 | const 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 | ||
97f20251 SR |
23 | /* |
24 | * The trace entry - the most basic unit of tracing. This is what | |
25 | * is printed in the end as a single line in the trace output, such as: | |
26 | * | |
27 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
28 | */ | |
29 | struct trace_entry { | |
89ec0dee | 30 | unsigned short type; |
97f20251 SR |
31 | unsigned char flags; |
32 | unsigned char preempt_count; | |
33 | int pid; | |
34 | int tgid; | |
35 | }; | |
36 | ||
89ec0dee SR |
37 | #define FTRACE_MAX_EVENT \ |
38 | ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1) | |
39 | ||
97f20251 SR |
40 | /* |
41 | * Trace iterator - used by printout routines who present trace | |
42 | * results to users and which routines might sleep, etc: | |
43 | */ | |
44 | struct trace_iterator { | |
45 | struct trace_array *tr; | |
46 | struct tracer *trace; | |
47 | void *private; | |
48 | int cpu_file; | |
49 | struct mutex mutex; | |
50 | struct ring_buffer_iter *buffer_iter[NR_CPUS]; | |
51 | ||
52 | /* The below is zeroed out in pipe_read */ | |
53 | struct trace_seq seq; | |
54 | struct trace_entry *ent; | |
55 | int cpu; | |
56 | u64 ts; | |
57 | ||
58 | unsigned long iter_flags; | |
59 | loff_t pos; | |
60 | long idx; | |
61 | ||
62 | cpumask_var_t started; | |
63 | }; | |
64 | ||
65 | ||
66 | typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter, | |
67 | int flags); | |
68 | struct trace_event { | |
69 | struct hlist_node node; | |
060fa5c8 | 70 | struct list_head list; |
97f20251 SR |
71 | int type; |
72 | trace_print_func trace; | |
73 | trace_print_func raw; | |
74 | trace_print_func hex; | |
75 | trace_print_func binary; | |
76 | }; | |
77 | ||
78 | extern int register_ftrace_event(struct trace_event *event); | |
79 | extern int unregister_ftrace_event(struct trace_event *event); | |
80 | ||
81 | /* Return values for print_line callback */ | |
82 | enum print_line_t { | |
83 | TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ | |
84 | TRACE_TYPE_HANDLED = 1, | |
85 | TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */ | |
86 | TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */ | |
87 | }; | |
88 | ||
89 | ||
90 | struct ring_buffer_event * | |
7a4f453b | 91 | trace_current_buffer_lock_reserve(int type, unsigned long len, |
97f20251 SR |
92 | unsigned long flags, int pc); |
93 | void trace_current_buffer_unlock_commit(struct ring_buffer_event *event, | |
94 | unsigned long flags, int pc); | |
95 | void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event, | |
96 | unsigned long flags, int pc); | |
97 | void trace_current_buffer_discard_commit(struct ring_buffer_event *event); | |
98 | ||
99 | void tracing_record_cmdline(struct task_struct *tsk); | |
100 | ||
101 | struct ftrace_event_call { | |
a59fd602 | 102 | struct list_head list; |
97f20251 SR |
103 | char *name; |
104 | char *system; | |
105 | struct dentry *dir; | |
6d723736 | 106 | struct trace_event *event; |
97f20251 SR |
107 | int enabled; |
108 | int (*regfunc)(void); | |
109 | void (*unregfunc)(void); | |
110 | int id; | |
111 | int (*raw_init)(void); | |
112 | int (*show_format)(struct trace_seq *s); | |
113 | int (*define_fields)(void); | |
114 | struct list_head fields; | |
30e673b2 TZ |
115 | int filter_active; |
116 | void *filter; | |
6d723736 | 117 | void *mod; |
97f20251 SR |
118 | |
119 | #ifdef CONFIG_EVENT_PROFILE | |
120 | atomic_t profile_count; | |
121 | int (*profile_enable)(struct ftrace_event_call *); | |
122 | void (*profile_disable)(struct ftrace_event_call *); | |
123 | #endif | |
124 | }; | |
125 | ||
8b372562 | 126 | #define MAX_FILTER_PRED 32 |
97f20251 SR |
127 | #define MAX_FILTER_STR_VAL 128 |
128 | ||
129 | extern int init_preds(struct ftrace_event_call *call); | |
2df75e41 | 130 | extern void destroy_preds(struct ftrace_event_call *call); |
97f20251 SR |
131 | extern int filter_match_preds(struct ftrace_event_call *call, void *rec); |
132 | extern int filter_current_check_discard(struct ftrace_event_call *call, | |
133 | void *rec, | |
134 | struct ring_buffer_event *event); | |
135 | ||
136 | extern int trace_define_field(struct ftrace_event_call *call, char *type, | |
a118e4d1 | 137 | char *name, int offset, int size, int is_signed); |
97f20251 | 138 | |
a118e4d1 | 139 | #define is_signed_type(type) (((type)(-1)) < 0) |
97f20251 | 140 | |
4671c794 SR |
141 | int trace_set_clr_event(const char *system, const char *event, int set); |
142 | ||
97f20251 SR |
143 | /* |
144 | * The double __builtin_constant_p is because gcc will give us an error | |
145 | * if we try to allocate the static variable to fmt if it is not a | |
146 | * constant. Even with the outer if statement optimizing out. | |
147 | */ | |
148 | #define event_trace_printk(ip, fmt, args...) \ | |
149 | do { \ | |
150 | __trace_printk_check_format(fmt, ##args); \ | |
151 | tracing_record_cmdline(current); \ | |
152 | if (__builtin_constant_p(fmt)) { \ | |
153 | static const char *trace_printk_fmt \ | |
154 | __attribute__((section("__trace_printk_fmt"))) = \ | |
155 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
156 | \ | |
157 | __trace_bprintk(ip, trace_printk_fmt, ##args); \ | |
158 | } else \ | |
159 | __trace_printk(ip, fmt, ##args); \ | |
160 | } while (0) | |
161 | ||
a118e4d1 | 162 | #define __common_field(type, item, is_signed) \ |
97f20251 SR |
163 | ret = trace_define_field(event_call, #type, "common_" #item, \ |
164 | offsetof(typeof(field.ent), item), \ | |
a118e4d1 | 165 | sizeof(field.ent.item), is_signed); \ |
97f20251 SR |
166 | if (ret) \ |
167 | return ret; | |
168 | ||
169 | #endif /* _LINUX_FTRACE_EVENT_H */ |