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1 | #ifndef _LINUX_FTRACE_EVENT_H |
2 | #define _LINUX_FTRACE_EVENT_H |
3 | |
4 | #include <linux/ring_buffer.h> |
5 | #include <linux/trace_seq.h> |
6 | #include <linux/percpu.h> |
7 | #include <linux/hardirq.h> |
8 | |
9 | struct trace_array; |
10 | struct tracer; |
11 | struct dentry; |
12 | |
13 | DECLARE_PER_CPU(struct trace_seq, ftrace_event_seq); |
14 | |
15 | struct trace_print_flags { |
16 | unsigned long mask; |
17 | const char *name; |
18 | }; |
19 | |
20 | const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim, |
21 | unsigned long flags, |
22 | const struct trace_print_flags *flag_array); |
23 | |
24 | const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val, |
25 | const struct trace_print_flags *symbol_array); |
26 | |
27 | /* |
28 | * The trace entry - the most basic unit of tracing. This is what |
29 | * is printed in the end as a single line in the trace output, such as: |
30 | * |
31 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter |
32 | */ |
33 | struct trace_entry { |
34 | unsigned short type; |
35 | unsigned char flags; |
36 | unsigned char preempt_count; |
37 | int pid; |
38 | int lock_depth; |
39 | }; |
40 | |
41 | #define FTRACE_MAX_EVENT \ |
42 | ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1) |
43 | |
44 | /* |
45 | * Trace iterator - used by printout routines who present trace |
46 | * results to users and which routines might sleep, etc: |
47 | */ |
48 | struct trace_iterator { |
49 | struct trace_array *tr; |
50 | struct tracer *trace; |
51 | void *private; |
52 | int cpu_file; |
53 | struct mutex mutex; |
54 | struct ring_buffer_iter *buffer_iter[NR_CPUS]; |
55 | unsigned long iter_flags; |
56 | |
57 | /* The below is zeroed out in pipe_read */ |
58 | struct trace_seq seq; |
59 | struct trace_entry *ent; |
60 | int cpu; |
61 | u64 ts; |
62 | |
63 | loff_t pos; |
64 | long idx; |
65 | |
66 | cpumask_var_t started; |
67 | }; |
68 | |
69 | |
70 | typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter, |
71 | int flags); |
72 | struct trace_event { |
73 | struct hlist_node node; |
74 | struct list_head list; |
75 | int type; |
76 | trace_print_func trace; |
77 | trace_print_func raw; |
78 | trace_print_func hex; |
79 | trace_print_func binary; |
80 | }; |
81 | |
82 | extern int register_ftrace_event(struct trace_event *event); |
83 | extern int unregister_ftrace_event(struct trace_event *event); |
84 | |
85 | /* Return values for print_line callback */ |
86 | enum print_line_t { |
87 | TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ |
88 | TRACE_TYPE_HANDLED = 1, |
89 | TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */ |
90 | TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */ |
91 | }; |
92 | |
93 | void tracing_generic_entry_update(struct trace_entry *entry, |
94 | unsigned long flags, |
95 | int pc); |
96 | struct ring_buffer_event * |
97 | trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer, |
98 | int type, unsigned long len, |
99 | unsigned long flags, int pc); |
100 | void trace_current_buffer_unlock_commit(struct ring_buffer *buffer, |
101 | struct ring_buffer_event *event, |
102 | unsigned long flags, int pc); |
103 | void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer, |
104 | struct ring_buffer_event *event, |
105 | unsigned long flags, int pc); |
106 | void trace_current_buffer_discard_commit(struct ring_buffer *buffer, |
107 | struct ring_buffer_event *event); |
108 | |
109 | void tracing_record_cmdline(struct task_struct *tsk); |
110 | |
111 | struct event_filter; |
112 | |
113 | struct ftrace_event_call { |
114 | struct list_head list; |
115 | char *name; |
116 | char *system; |
117 | struct dentry *dir; |
118 | struct trace_event *event; |
119 | int enabled; |
120 | int (*regfunc)(void *); |
121 | void (*unregfunc)(void *); |
122 | int id; |
123 | int (*raw_init)(void); |
124 | int (*show_format)(struct ftrace_event_call *call, |
125 | struct trace_seq *s); |
126 | int (*define_fields)(struct ftrace_event_call *); |
127 | struct list_head fields; |
128 | int filter_active; |
129 | struct event_filter *filter; |
130 | void *mod; |
131 | void *data; |
132 | |
133 | atomic_t profile_count; |
134 | int (*profile_enable)(void); |
135 | void (*profile_disable)(void); |
136 | }; |
137 | |
138 | #define FTRACE_MAX_PROFILE_SIZE 2048 |
139 | |
140 | extern char *trace_profile_buf; |
141 | extern char *trace_profile_buf_nmi; |
142 | |
143 | #define MAX_FILTER_PRED 32 |
144 | #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */ |
145 | |
146 | extern void destroy_preds(struct ftrace_event_call *call); |
147 | extern int filter_match_preds(struct ftrace_event_call *call, void *rec); |
148 | extern int filter_current_check_discard(struct ring_buffer *buffer, |
149 | struct ftrace_event_call *call, |
150 | void *rec, |
151 | struct ring_buffer_event *event); |
152 | |
153 | enum { |
154 | FILTER_OTHER = 0, |
155 | FILTER_STATIC_STRING, |
156 | FILTER_DYN_STRING, |
157 | FILTER_PTR_STRING, |
158 | }; |
159 | |
160 | extern int trace_define_field(struct ftrace_event_call *call, |
161 | const char *type, const char *name, |
162 | int offset, int size, int is_signed, |
163 | int filter_type); |
164 | extern int trace_define_common_fields(struct ftrace_event_call *call); |
165 | |
166 | #define is_signed_type(type) (((type)(-1)) < 0) |
167 | |
168 | int trace_set_clr_event(const char *system, const char *event, int set); |
169 | |
170 | /* |
171 | * The double __builtin_constant_p is because gcc will give us an error |
172 | * if we try to allocate the static variable to fmt if it is not a |
173 | * constant. Even with the outer if statement optimizing out. |
174 | */ |
175 | #define event_trace_printk(ip, fmt, args...) \ |
176 | do { \ |
177 | __trace_printk_check_format(fmt, ##args); \ |
178 | tracing_record_cmdline(current); \ |
179 | if (__builtin_constant_p(fmt)) { \ |
180 | static const char *trace_printk_fmt \ |
181 | __attribute__((section("__trace_printk_fmt"))) = \ |
182 | __builtin_constant_p(fmt) ? fmt : NULL; \ |
183 | \ |
184 | __trace_bprintk(ip, trace_printk_fmt, ##args); \ |
185 | } else \ |
186 | __trace_printk(ip, fmt, ##args); \ |
187 | } while (0) |
188 | |
189 | #endif /* _LINUX_FTRACE_EVENT_H */ |
190 |
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