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