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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 | #include <linux/perf_event.h> | |
9 | ||
10 | struct trace_array; | |
11 | struct tracer; | |
12 | struct dentry; | |
13 | ||
14 | DECLARE_PER_CPU(struct trace_seq, ftrace_event_seq); | |
15 | ||
16 | struct trace_print_flags { | |
17 | unsigned long mask; | |
18 | const char *name; | |
19 | }; | |
20 | ||
21 | const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim, | |
22 | unsigned long flags, | |
23 | const struct trace_print_flags *flag_array); | |
24 | ||
25 | const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val, | |
26 | const struct trace_print_flags *symbol_array); | |
27 | ||
28 | /* | |
29 | * The trace entry - the most basic unit of tracing. This is what | |
30 | * is printed in the end as a single line in the trace output, such as: | |
31 | * | |
32 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
33 | */ | |
34 | struct trace_entry { | |
35 | unsigned short type; | |
36 | unsigned char flags; | |
37 | unsigned char preempt_count; | |
38 | int pid; | |
39 | int lock_depth; | |
40 | }; | |
41 | ||
42 | #define FTRACE_MAX_EVENT \ | |
43 | ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1) | |
44 | ||
45 | /* | |
46 | * Trace iterator - used by printout routines who present trace | |
47 | * results to users and which routines might sleep, etc: | |
48 | */ | |
49 | struct trace_iterator { | |
50 | struct trace_array *tr; | |
51 | struct tracer *trace; | |
52 | void *private; | |
53 | int cpu_file; | |
54 | struct mutex mutex; | |
55 | struct ring_buffer_iter *buffer_iter[NR_CPUS]; | |
56 | unsigned long iter_flags; | |
57 | ||
58 | /* The below is zeroed out in pipe_read */ | |
59 | struct trace_seq seq; | |
60 | struct trace_entry *ent; | |
61 | unsigned long lost_events; | |
62 | int leftover; | |
63 | int cpu; | |
64 | u64 ts; | |
65 | ||
66 | loff_t pos; | |
67 | long idx; | |
68 | ||
69 | cpumask_var_t started; | |
70 | }; | |
71 | ||
72 | ||
73 | typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter, | |
74 | int flags); | |
75 | struct trace_event { | |
76 | struct hlist_node node; | |
77 | struct list_head list; | |
78 | int type; | |
79 | trace_print_func trace; | |
80 | trace_print_func raw; | |
81 | trace_print_func hex; | |
82 | trace_print_func binary; | |
83 | }; | |
84 | ||
85 | extern int register_ftrace_event(struct trace_event *event); | |
86 | extern int unregister_ftrace_event(struct trace_event *event); | |
87 | ||
88 | /* Return values for print_line callback */ | |
89 | enum print_line_t { | |
90 | TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ | |
91 | TRACE_TYPE_HANDLED = 1, | |
92 | TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */ | |
93 | TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */ | |
94 | }; | |
95 | ||
96 | void tracing_generic_entry_update(struct trace_entry *entry, | |
97 | unsigned long flags, | |
98 | int pc); | |
99 | struct ring_buffer_event * | |
100 | trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer, | |
101 | int type, unsigned long len, | |
102 | unsigned long flags, int pc); | |
103 | void trace_current_buffer_unlock_commit(struct ring_buffer *buffer, | |
104 | struct ring_buffer_event *event, | |
105 | unsigned long flags, int pc); | |
106 | void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer, | |
107 | struct ring_buffer_event *event, | |
108 | unsigned long flags, int pc); | |
109 | void trace_current_buffer_discard_commit(struct ring_buffer *buffer, | |
110 | struct ring_buffer_event *event); | |
111 | ||
112 | void tracing_record_cmdline(struct task_struct *tsk); | |
113 | ||
114 | struct event_filter; | |
115 | ||
116 | enum trace_reg { | |
117 | TRACE_REG_REGISTER, | |
118 | TRACE_REG_UNREGISTER, | |
119 | TRACE_REG_PERF_REGISTER, | |
120 | TRACE_REG_PERF_UNREGISTER, | |
121 | }; | |
122 | ||
123 | struct ftrace_event_call; | |
124 | ||
125 | struct ftrace_event_class { | |
126 | char *system; | |
127 | void *probe; | |
128 | #ifdef CONFIG_PERF_EVENTS | |
129 | void *perf_probe; | |
130 | #endif | |
131 | int (*reg)(struct ftrace_event_call *event, | |
132 | enum trace_reg type); | |
133 | }; | |
134 | ||
135 | struct ftrace_event_call { | |
136 | struct list_head list; | |
137 | struct ftrace_event_class *class; | |
138 | char *name; | |
139 | struct dentry *dir; | |
140 | struct trace_event *event; | |
141 | int enabled; | |
142 | int id; | |
143 | const char *print_fmt; | |
144 | int (*raw_init)(struct ftrace_event_call *); | |
145 | int (*define_fields)(struct ftrace_event_call *); | |
146 | struct list_head fields; | |
147 | int filter_active; | |
148 | struct event_filter *filter; | |
149 | void *mod; | |
150 | void *data; | |
151 | ||
152 | int perf_refcount; | |
153 | }; | |
154 | ||
155 | #define PERF_MAX_TRACE_SIZE 2048 | |
156 | ||
157 | #define MAX_FILTER_PRED 32 | |
158 | #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */ | |
159 | ||
160 | extern void destroy_preds(struct ftrace_event_call *call); | |
161 | extern int filter_match_preds(struct event_filter *filter, void *rec); | |
162 | extern int filter_current_check_discard(struct ring_buffer *buffer, | |
163 | struct ftrace_event_call *call, | |
164 | void *rec, | |
165 | struct ring_buffer_event *event); | |
166 | ||
167 | enum { | |
168 | FILTER_OTHER = 0, | |
169 | FILTER_STATIC_STRING, | |
170 | FILTER_DYN_STRING, | |
171 | FILTER_PTR_STRING, | |
172 | }; | |
173 | ||
174 | extern int trace_event_raw_init(struct ftrace_event_call *call); | |
175 | extern int trace_define_field(struct ftrace_event_call *call, const char *type, | |
176 | const char *name, int offset, int size, | |
177 | int is_signed, int filter_type); | |
178 | extern int trace_add_event_call(struct ftrace_event_call *call); | |
179 | extern void trace_remove_event_call(struct ftrace_event_call *call); | |
180 | ||
181 | #define is_signed_type(type) (((type)(-1)) < 0) | |
182 | ||
183 | int trace_set_clr_event(const char *system, const char *event, int set); | |
184 | ||
185 | /* | |
186 | * The double __builtin_constant_p is because gcc will give us an error | |
187 | * if we try to allocate the static variable to fmt if it is not a | |
188 | * constant. Even with the outer if statement optimizing out. | |
189 | */ | |
190 | #define event_trace_printk(ip, fmt, args...) \ | |
191 | do { \ | |
192 | __trace_printk_check_format(fmt, ##args); \ | |
193 | tracing_record_cmdline(current); \ | |
194 | if (__builtin_constant_p(fmt)) { \ | |
195 | static const char *trace_printk_fmt \ | |
196 | __attribute__((section("__trace_printk_fmt"))) = \ | |
197 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
198 | \ | |
199 | __trace_bprintk(ip, trace_printk_fmt, ##args); \ | |
200 | } else \ | |
201 | __trace_printk(ip, fmt, ##args); \ | |
202 | } while (0) | |
203 | ||
204 | #ifdef CONFIG_PERF_EVENTS | |
205 | struct perf_event; | |
206 | ||
207 | DECLARE_PER_CPU(struct pt_regs, perf_trace_regs); | |
208 | ||
209 | extern int perf_trace_enable(int event_id); | |
210 | extern void perf_trace_disable(int event_id); | |
211 | extern int ftrace_profile_set_filter(struct perf_event *event, int event_id, | |
212 | char *filter_str); | |
213 | extern void ftrace_profile_free_filter(struct perf_event *event); | |
214 | extern void * | |
215 | perf_trace_buf_prepare(int size, unsigned short type, int *rctxp, | |
216 | unsigned long *irq_flags); | |
217 | ||
218 | static inline void | |
219 | perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr, | |
220 | u64 count, unsigned long irq_flags, struct pt_regs *regs) | |
221 | { | |
222 | struct trace_entry *entry = raw_data; | |
223 | ||
224 | perf_tp_event(entry->type, addr, count, raw_data, size, regs); | |
225 | perf_swevent_put_recursion_context(rctx); | |
226 | local_irq_restore(irq_flags); | |
227 | } | |
228 | #endif | |
229 | ||
230 | #endif /* _LINUX_FTRACE_EVENT_H */ |