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