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bc0c38d1 SR |
1 | #ifndef _LINUX_KERNEL_TRACE_H |
2 | #define _LINUX_KERNEL_TRACE_H | |
3 | ||
4 | #include <linux/fs.h> | |
5 | #include <asm/atomic.h> | |
6 | #include <linux/sched.h> | |
7 | #include <linux/clocksource.h> | |
8 | ||
9 | /* | |
10 | * Function trace entry - function address and parent function addres: | |
11 | */ | |
12 | struct ftrace_entry { | |
13 | unsigned long ip; | |
14 | unsigned long parent_ip; | |
15 | }; | |
16 | ||
17 | /* | |
18 | * Context switch trace entry - which task (and prio) we switched from/to: | |
19 | */ | |
20 | struct ctx_switch_entry { | |
21 | unsigned int prev_pid; | |
22 | unsigned char prev_prio; | |
23 | unsigned char prev_state; | |
24 | unsigned int next_pid; | |
25 | unsigned char next_prio; | |
26 | }; | |
27 | ||
f0a920d5 IM |
28 | /* |
29 | * Special (free-form) trace entry: | |
30 | */ | |
31 | struct special_entry { | |
32 | unsigned long arg1; | |
33 | unsigned long arg2; | |
34 | unsigned long arg3; | |
35 | }; | |
36 | ||
86387f7e IM |
37 | /* |
38 | * Stack-trace entry: | |
39 | */ | |
40 | ||
41 | #define FTRACE_STACK_ENTRIES 5 | |
42 | ||
43 | struct stack_entry { | |
44 | unsigned long caller[FTRACE_STACK_ENTRIES]; | |
45 | }; | |
46 | ||
bc0c38d1 SR |
47 | /* |
48 | * The trace entry - the most basic unit of tracing. This is what | |
49 | * is printed in the end as a single line in the trace output, such as: | |
50 | * | |
51 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
52 | */ | |
53 | struct trace_entry { | |
54 | char type; | |
55 | char cpu; | |
56 | char flags; | |
57 | char preempt_count; | |
58 | int pid; | |
59 | cycle_t t; | |
bc0c38d1 SR |
60 | union { |
61 | struct ftrace_entry fn; | |
62 | struct ctx_switch_entry ctx; | |
f0a920d5 | 63 | struct special_entry special; |
86387f7e | 64 | struct stack_entry stack; |
bc0c38d1 SR |
65 | }; |
66 | }; | |
67 | ||
68 | #define TRACE_ENTRY_SIZE sizeof(struct trace_entry) | |
69 | ||
70 | /* | |
71 | * The CPU trace array - it consists of thousands of trace entries | |
72 | * plus some other descriptor data: (for example which task started | |
73 | * the trace, etc.) | |
74 | */ | |
75 | struct trace_array_cpu { | |
4c11d7ae | 76 | struct list_head trace_pages; |
bc0c38d1 | 77 | atomic_t disabled; |
b3806b43 | 78 | spinlock_t lock; |
d4c5a2f5 | 79 | struct lock_class_key lock_key; |
4e3c3333 | 80 | |
c7aafc54 | 81 | /* these fields get copied into max-trace: */ |
93a588f4 SR |
82 | unsigned trace_head_idx; |
83 | unsigned trace_tail_idx; | |
84 | void *trace_head; /* producer */ | |
85 | void *trace_tail; /* consumer */ | |
c7aafc54 | 86 | unsigned long trace_idx; |
bc0c38d1 SR |
87 | unsigned long saved_latency; |
88 | unsigned long critical_start; | |
89 | unsigned long critical_end; | |
90 | unsigned long critical_sequence; | |
91 | unsigned long nice; | |
92 | unsigned long policy; | |
93 | unsigned long rt_priority; | |
94 | cycle_t preempt_timestamp; | |
95 | pid_t pid; | |
96 | uid_t uid; | |
97 | char comm[TASK_COMM_LEN]; | |
98 | }; | |
99 | ||
100 | struct trace_iterator; | |
101 | ||
102 | /* | |
103 | * The trace array - an array of per-CPU trace arrays. This is the | |
104 | * highest level data structure that individual tracers deal with. | |
105 | * They have on/off state as well: | |
106 | */ | |
107 | struct trace_array { | |
108 | unsigned long entries; | |
109 | long ctrl; | |
110 | int cpu; | |
111 | cycle_t time_start; | |
b3806b43 | 112 | struct task_struct *waiter; |
bc0c38d1 SR |
113 | struct trace_array_cpu *data[NR_CPUS]; |
114 | }; | |
115 | ||
116 | /* | |
117 | * A specific tracer, represented by methods that operate on a trace array: | |
118 | */ | |
119 | struct tracer { | |
120 | const char *name; | |
121 | void (*init)(struct trace_array *tr); | |
122 | void (*reset)(struct trace_array *tr); | |
123 | void (*open)(struct trace_iterator *iter); | |
124 | void (*close)(struct trace_iterator *iter); | |
125 | void (*start)(struct trace_iterator *iter); | |
126 | void (*stop)(struct trace_iterator *iter); | |
127 | void (*ctrl_update)(struct trace_array *tr); | |
60a11774 SR |
128 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
129 | int (*selftest)(struct tracer *trace, | |
130 | struct trace_array *tr); | |
131 | #endif | |
bc0c38d1 SR |
132 | struct tracer *next; |
133 | int print_max; | |
134 | }; | |
135 | ||
214023c3 SR |
136 | struct trace_seq { |
137 | unsigned char buffer[PAGE_SIZE]; | |
138 | unsigned int len; | |
139 | }; | |
140 | ||
bc0c38d1 SR |
141 | /* |
142 | * Trace iterator - used by printout routines who present trace | |
143 | * results to users and which routines might sleep, etc: | |
144 | */ | |
145 | struct trace_iterator { | |
214023c3 | 146 | struct trace_seq seq; |
bc0c38d1 SR |
147 | struct trace_array *tr; |
148 | struct tracer *trace; | |
4e3c3333 | 149 | |
bc0c38d1 | 150 | struct trace_entry *ent; |
4e3c3333 IM |
151 | int cpu; |
152 | ||
153 | struct trace_entry *prev_ent; | |
154 | int prev_cpu; | |
155 | ||
bc0c38d1 SR |
156 | unsigned long iter_flags; |
157 | loff_t pos; | |
158 | unsigned long next_idx[NR_CPUS]; | |
4c11d7ae SR |
159 | struct list_head *next_page[NR_CPUS]; |
160 | unsigned next_page_idx[NR_CPUS]; | |
161 | long idx; | |
bc0c38d1 SR |
162 | }; |
163 | ||
e309b41d | 164 | void tracing_reset(struct trace_array_cpu *data); |
bc0c38d1 SR |
165 | int tracing_open_generic(struct inode *inode, struct file *filp); |
166 | struct dentry *tracing_init_dentry(void); | |
167 | void ftrace(struct trace_array *tr, | |
168 | struct trace_array_cpu *data, | |
169 | unsigned long ip, | |
170 | unsigned long parent_ip, | |
171 | unsigned long flags); | |
172 | void tracing_sched_switch_trace(struct trace_array *tr, | |
173 | struct trace_array_cpu *data, | |
174 | struct task_struct *prev, | |
175 | struct task_struct *next, | |
176 | unsigned long flags); | |
177 | void tracing_record_cmdline(struct task_struct *tsk); | |
57422797 IM |
178 | |
179 | void tracing_sched_wakeup_trace(struct trace_array *tr, | |
180 | struct trace_array_cpu *data, | |
181 | struct task_struct *wakee, | |
182 | struct task_struct *cur, | |
183 | unsigned long flags); | |
f0a920d5 IM |
184 | void trace_special(struct trace_array *tr, |
185 | struct trace_array_cpu *data, | |
186 | unsigned long arg1, | |
187 | unsigned long arg2, | |
188 | unsigned long arg3); | |
6fb44b71 SR |
189 | void trace_function(struct trace_array *tr, |
190 | struct trace_array_cpu *data, | |
191 | unsigned long ip, | |
192 | unsigned long parent_ip, | |
193 | unsigned long flags); | |
bc0c38d1 SR |
194 | |
195 | void tracing_start_function_trace(void); | |
196 | void tracing_stop_function_trace(void); | |
197 | int register_tracer(struct tracer *type); | |
198 | void unregister_tracer(struct tracer *type); | |
199 | ||
200 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
201 | ||
202 | extern unsigned long tracing_max_latency; | |
203 | extern unsigned long tracing_thresh; | |
204 | ||
205 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); | |
206 | void update_max_tr_single(struct trace_array *tr, | |
207 | struct task_struct *tsk, int cpu); | |
208 | ||
e309b41d | 209 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 SR |
210 | |
211 | #ifdef CONFIG_SCHED_TRACER | |
e309b41d | 212 | extern void |
bc0c38d1 | 213 | wakeup_sched_switch(struct task_struct *prev, struct task_struct *next); |
57422797 IM |
214 | extern void |
215 | wakeup_sched_wakeup(struct task_struct *wakee, struct task_struct *curr); | |
bc0c38d1 SR |
216 | #else |
217 | static inline void | |
218 | wakeup_sched_switch(struct task_struct *prev, struct task_struct *next) | |
219 | { | |
220 | } | |
57422797 IM |
221 | static inline void |
222 | wakeup_sched_wakeup(struct task_struct *wakee, struct task_struct *curr) | |
223 | { | |
224 | } | |
bc0c38d1 SR |
225 | #endif |
226 | ||
227 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER | |
228 | typedef void | |
229 | (*tracer_switch_func_t)(void *private, | |
230 | struct task_struct *prev, | |
231 | struct task_struct *next); | |
232 | ||
233 | struct tracer_switch_ops { | |
234 | tracer_switch_func_t func; | |
235 | void *private; | |
236 | struct tracer_switch_ops *next; | |
237 | }; | |
238 | ||
239 | extern int register_tracer_switch(struct tracer_switch_ops *ops); | |
240 | extern int unregister_tracer_switch(struct tracer_switch_ops *ops); | |
241 | ||
242 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ | |
243 | ||
244 | #ifdef CONFIG_DYNAMIC_FTRACE | |
245 | extern unsigned long ftrace_update_tot_cnt; | |
246 | #endif | |
247 | ||
60a11774 SR |
248 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
249 | #ifdef CONFIG_FTRACE | |
250 | extern int trace_selftest_startup_function(struct tracer *trace, | |
251 | struct trace_array *tr); | |
252 | #endif | |
253 | #ifdef CONFIG_IRQSOFF_TRACER | |
254 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, | |
255 | struct trace_array *tr); | |
256 | #endif | |
257 | #ifdef CONFIG_PREEMPT_TRACER | |
258 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, | |
259 | struct trace_array *tr); | |
260 | #endif | |
261 | #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER) | |
262 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, | |
263 | struct trace_array *tr); | |
264 | #endif | |
265 | #ifdef CONFIG_SCHED_TRACER | |
266 | extern int trace_selftest_startup_wakeup(struct tracer *trace, | |
267 | struct trace_array *tr); | |
268 | #endif | |
269 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER | |
270 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, | |
271 | struct trace_array *tr); | |
272 | #endif | |
273 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ | |
274 | ||
c7aafc54 IM |
275 | extern void *head_page(struct trace_array_cpu *data); |
276 | ||
4e655519 IM |
277 | extern unsigned long trace_flags; |
278 | ||
279 | enum trace_iterator_flags { | |
280 | TRACE_ITER_PRINT_PARENT = 0x01, | |
281 | TRACE_ITER_SYM_OFFSET = 0x02, | |
282 | TRACE_ITER_SYM_ADDR = 0x04, | |
283 | TRACE_ITER_VERBOSE = 0x08, | |
284 | TRACE_ITER_RAW = 0x10, | |
285 | TRACE_ITER_HEX = 0x20, | |
286 | TRACE_ITER_BIN = 0x40, | |
287 | TRACE_ITER_BLOCK = 0x80, | |
288 | TRACE_ITER_STACKTRACE = 0x100, | |
4ac3ba41 | 289 | TRACE_ITER_SCHED_TREE = 0x200, |
4e655519 IM |
290 | }; |
291 | ||
bc0c38d1 | 292 | #endif /* _LINUX_KERNEL_TRACE_H */ |