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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; | |
59 | int type; | |
60 | trace_print_func trace; | |
61 | trace_print_func raw; | |
62 | trace_print_func hex; | |
63 | trace_print_func binary; | |
64 | }; | |
65 | ||
66 | extern int register_ftrace_event(struct trace_event *event); | |
67 | extern int unregister_ftrace_event(struct trace_event *event); | |
68 | ||
69 | /* Return values for print_line callback */ | |
70 | enum print_line_t { | |
71 | TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ | |
72 | TRACE_TYPE_HANDLED = 1, | |
73 | TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */ | |
74 | TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */ | |
75 | }; | |
76 | ||
77 | ||
78 | struct ring_buffer_event * | |
7a4f453b | 79 | trace_current_buffer_lock_reserve(int type, unsigned long len, |
97f20251 SR |
80 | unsigned long flags, int pc); |
81 | void trace_current_buffer_unlock_commit(struct ring_buffer_event *event, | |
82 | unsigned long flags, int pc); | |
83 | void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event, | |
84 | unsigned long flags, int pc); | |
85 | void trace_current_buffer_discard_commit(struct ring_buffer_event *event); | |
86 | ||
87 | void tracing_record_cmdline(struct task_struct *tsk); | |
88 | ||
89 | struct ftrace_event_call { | |
a59fd602 | 90 | struct list_head list; |
97f20251 SR |
91 | char *name; |
92 | char *system; | |
93 | struct dentry *dir; | |
6d723736 | 94 | struct trace_event *event; |
97f20251 SR |
95 | int enabled; |
96 | int (*regfunc)(void); | |
97 | void (*unregfunc)(void); | |
98 | int id; | |
99 | int (*raw_init)(void); | |
100 | int (*show_format)(struct trace_seq *s); | |
101 | int (*define_fields)(void); | |
102 | struct list_head fields; | |
103 | int n_preds; | |
104 | struct filter_pred **preds; | |
6d723736 | 105 | void *mod; |
97f20251 SR |
106 | |
107 | #ifdef CONFIG_EVENT_PROFILE | |
108 | atomic_t profile_count; | |
109 | int (*profile_enable)(struct ftrace_event_call *); | |
110 | void (*profile_disable)(struct ftrace_event_call *); | |
111 | #endif | |
112 | }; | |
113 | ||
114 | #define MAX_FILTER_PRED 8 | |
115 | #define MAX_FILTER_STR_VAL 128 | |
116 | ||
117 | extern int init_preds(struct ftrace_event_call *call); | |
118 | extern int filter_match_preds(struct ftrace_event_call *call, void *rec); | |
119 | extern int filter_current_check_discard(struct ftrace_event_call *call, | |
120 | void *rec, | |
121 | struct ring_buffer_event *event); | |
122 | ||
123 | extern int trace_define_field(struct ftrace_event_call *call, char *type, | |
124 | char *name, int offset, int size); | |
125 | ||
126 | ||
127 | /* | |
128 | * The double __builtin_constant_p is because gcc will give us an error | |
129 | * if we try to allocate the static variable to fmt if it is not a | |
130 | * constant. Even with the outer if statement optimizing out. | |
131 | */ | |
132 | #define event_trace_printk(ip, fmt, args...) \ | |
133 | do { \ | |
134 | __trace_printk_check_format(fmt, ##args); \ | |
135 | tracing_record_cmdline(current); \ | |
136 | if (__builtin_constant_p(fmt)) { \ | |
137 | static const char *trace_printk_fmt \ | |
138 | __attribute__((section("__trace_printk_fmt"))) = \ | |
139 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
140 | \ | |
141 | __trace_bprintk(ip, trace_printk_fmt, ##args); \ | |
142 | } else \ | |
143 | __trace_printk(ip, fmt, ##args); \ | |
144 | } while (0) | |
145 | ||
146 | #define __common_field(type, item) \ | |
147 | ret = trace_define_field(event_call, #type, "common_" #item, \ | |
148 | offsetof(typeof(field.ent), item), \ | |
149 | sizeof(field.ent.item)); \ | |
150 | if (ret) \ | |
151 | return ret; | |
152 | ||
153 | #endif /* _LINUX_FTRACE_EVENT_H */ |