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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> | |
bd8ac686 | 8 | #include <linux/mmiotrace.h> |
bc0c38d1 | 9 | |
72829bc3 TG |
10 | enum trace_type { |
11 | __TRACE_FIRST_TYPE = 0, | |
12 | ||
13 | TRACE_FN, | |
14 | TRACE_CTX, | |
15 | TRACE_WAKE, | |
dd0e545f | 16 | TRACE_CONT, |
72829bc3 | 17 | TRACE_STACK, |
dd0e545f | 18 | TRACE_PRINT, |
72829bc3 | 19 | TRACE_SPECIAL, |
bd8ac686 PP |
20 | TRACE_MMIO_RW, |
21 | TRACE_MMIO_MAP, | |
72829bc3 TG |
22 | |
23 | __TRACE_LAST_TYPE | |
24 | }; | |
25 | ||
bc0c38d1 SR |
26 | /* |
27 | * Function trace entry - function address and parent function addres: | |
28 | */ | |
29 | struct ftrace_entry { | |
30 | unsigned long ip; | |
31 | unsigned long parent_ip; | |
32 | }; | |
33 | ||
34 | /* | |
35 | * Context switch trace entry - which task (and prio) we switched from/to: | |
36 | */ | |
37 | struct ctx_switch_entry { | |
38 | unsigned int prev_pid; | |
39 | unsigned char prev_prio; | |
40 | unsigned char prev_state; | |
41 | unsigned int next_pid; | |
42 | unsigned char next_prio; | |
bac524d3 | 43 | unsigned char next_state; |
80b5e940 | 44 | unsigned int next_cpu; |
bc0c38d1 SR |
45 | }; |
46 | ||
f0a920d5 IM |
47 | /* |
48 | * Special (free-form) trace entry: | |
49 | */ | |
50 | struct special_entry { | |
51 | unsigned long arg1; | |
52 | unsigned long arg2; | |
53 | unsigned long arg3; | |
54 | }; | |
55 | ||
86387f7e IM |
56 | /* |
57 | * Stack-trace entry: | |
58 | */ | |
59 | ||
74f4e369 | 60 | #define FTRACE_STACK_ENTRIES 8 |
86387f7e IM |
61 | |
62 | struct stack_entry { | |
63 | unsigned long caller[FTRACE_STACK_ENTRIES]; | |
64 | }; | |
65 | ||
dd0e545f SR |
66 | /* |
67 | * ftrace_printk entry: | |
68 | */ | |
69 | struct print_entry { | |
70 | unsigned long ip; | |
71 | char buf[]; | |
72 | }; | |
73 | ||
fc5e27ae PP |
74 | /* |
75 | * trace_flag_type is an enumeration that holds different | |
76 | * states when a trace occurs. These are: | |
77 | * IRQS_OFF - interrupts were disabled | |
78 | * NEED_RESCED - reschedule is requested | |
79 | * HARDIRQ - inside an interrupt handler | |
80 | * SOFTIRQ - inside a softirq handler | |
81 | * CONT - multiple entries hold the trace item | |
82 | */ | |
83 | enum trace_flag_type { | |
84 | TRACE_FLAG_IRQS_OFF = 0x01, | |
85 | TRACE_FLAG_NEED_RESCHED = 0x02, | |
86 | TRACE_FLAG_HARDIRQ = 0x04, | |
87 | TRACE_FLAG_SOFTIRQ = 0x08, | |
88 | TRACE_FLAG_CONT = 0x10, | |
89 | }; | |
90 | ||
bc0c38d1 | 91 | /* |
2e2ca155 | 92 | * The trace field - the most basic unit of tracing. This is what |
bc0c38d1 SR |
93 | * is printed in the end as a single line in the trace output, such as: |
94 | * | |
95 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
96 | */ | |
2e2ca155 | 97 | struct trace_field { |
bc0c38d1 SR |
98 | char cpu; |
99 | char flags; | |
100 | char preempt_count; | |
101 | int pid; | |
102 | cycle_t t; | |
bc0c38d1 SR |
103 | union { |
104 | struct ftrace_entry fn; | |
105 | struct ctx_switch_entry ctx; | |
f0a920d5 | 106 | struct special_entry special; |
86387f7e | 107 | struct stack_entry stack; |
dd0e545f | 108 | struct print_entry print; |
bd8ac686 PP |
109 | struct mmiotrace_rw mmiorw; |
110 | struct mmiotrace_map mmiomap; | |
bc0c38d1 SR |
111 | }; |
112 | }; | |
113 | ||
2e2ca155 SR |
114 | struct trace_field_cont { |
115 | char buf[sizeof(struct trace_field)]; | |
116 | }; | |
117 | ||
118 | struct trace_entry { | |
119 | char type; | |
120 | union { | |
121 | struct trace_field field; | |
122 | struct trace_field_cont cont; | |
123 | }; | |
124 | }; | |
125 | ||
bc0c38d1 | 126 | #define TRACE_ENTRY_SIZE sizeof(struct trace_entry) |
5bf9a1ee PP |
127 | #define TRACE_BUF_SIZE 1024 |
128 | #define TRACE_PRINT_BUF_SIZE \ | |
129 | (sizeof(struct trace_field) - offsetof(struct trace_field, print.buf)) | |
130 | #define TRACE_CONT_BUF_SIZE sizeof(struct trace_field) | |
bc0c38d1 SR |
131 | |
132 | /* | |
133 | * The CPU trace array - it consists of thousands of trace entries | |
134 | * plus some other descriptor data: (for example which task started | |
135 | * the trace, etc.) | |
136 | */ | |
137 | struct trace_array_cpu { | |
4c11d7ae | 138 | struct list_head trace_pages; |
bc0c38d1 | 139 | atomic_t disabled; |
92205c23 | 140 | raw_spinlock_t lock; |
d4c5a2f5 | 141 | struct lock_class_key lock_key; |
4e3c3333 | 142 | |
c7aafc54 | 143 | /* these fields get copied into max-trace: */ |
93a588f4 SR |
144 | unsigned trace_head_idx; |
145 | unsigned trace_tail_idx; | |
146 | void *trace_head; /* producer */ | |
147 | void *trace_tail; /* consumer */ | |
c7aafc54 | 148 | unsigned long trace_idx; |
53d0aa77 | 149 | unsigned long overrun; |
bc0c38d1 SR |
150 | unsigned long saved_latency; |
151 | unsigned long critical_start; | |
152 | unsigned long critical_end; | |
153 | unsigned long critical_sequence; | |
154 | unsigned long nice; | |
155 | unsigned long policy; | |
156 | unsigned long rt_priority; | |
157 | cycle_t preempt_timestamp; | |
158 | pid_t pid; | |
159 | uid_t uid; | |
160 | char comm[TASK_COMM_LEN]; | |
161 | }; | |
162 | ||
163 | struct trace_iterator; | |
164 | ||
165 | /* | |
166 | * The trace array - an array of per-CPU trace arrays. This is the | |
167 | * highest level data structure that individual tracers deal with. | |
168 | * They have on/off state as well: | |
169 | */ | |
170 | struct trace_array { | |
171 | unsigned long entries; | |
172 | long ctrl; | |
173 | int cpu; | |
174 | cycle_t time_start; | |
b3806b43 | 175 | struct task_struct *waiter; |
bc0c38d1 SR |
176 | struct trace_array_cpu *data[NR_CPUS]; |
177 | }; | |
178 | ||
179 | /* | |
180 | * A specific tracer, represented by methods that operate on a trace array: | |
181 | */ | |
182 | struct tracer { | |
183 | const char *name; | |
184 | void (*init)(struct trace_array *tr); | |
185 | void (*reset)(struct trace_array *tr); | |
186 | void (*open)(struct trace_iterator *iter); | |
107bad8b | 187 | void (*pipe_open)(struct trace_iterator *iter); |
bc0c38d1 SR |
188 | void (*close)(struct trace_iterator *iter); |
189 | void (*start)(struct trace_iterator *iter); | |
190 | void (*stop)(struct trace_iterator *iter); | |
107bad8b SR |
191 | ssize_t (*read)(struct trace_iterator *iter, |
192 | struct file *filp, char __user *ubuf, | |
193 | size_t cnt, loff_t *ppos); | |
bc0c38d1 | 194 | void (*ctrl_update)(struct trace_array *tr); |
60a11774 SR |
195 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
196 | int (*selftest)(struct tracer *trace, | |
197 | struct trace_array *tr); | |
198 | #endif | |
72829bc3 | 199 | int (*print_line)(struct trace_iterator *iter); |
bc0c38d1 SR |
200 | struct tracer *next; |
201 | int print_max; | |
202 | }; | |
203 | ||
214023c3 SR |
204 | struct trace_seq { |
205 | unsigned char buffer[PAGE_SIZE]; | |
206 | unsigned int len; | |
6c6c2796 | 207 | unsigned int readpos; |
214023c3 SR |
208 | }; |
209 | ||
bc0c38d1 SR |
210 | /* |
211 | * Trace iterator - used by printout routines who present trace | |
212 | * results to users and which routines might sleep, etc: | |
213 | */ | |
214 | struct trace_iterator { | |
215 | struct trace_array *tr; | |
216 | struct tracer *trace; | |
107bad8b | 217 | void *private; |
53d0aa77 SR |
218 | long last_overrun[NR_CPUS]; |
219 | long overrun[NR_CPUS]; | |
4e3c3333 | 220 | |
53d0aa77 SR |
221 | /* The below is zeroed out in pipe_read */ |
222 | struct trace_seq seq; | |
bc0c38d1 | 223 | struct trace_entry *ent; |
4e3c3333 IM |
224 | int cpu; |
225 | ||
226 | struct trace_entry *prev_ent; | |
227 | int prev_cpu; | |
228 | ||
bc0c38d1 SR |
229 | unsigned long iter_flags; |
230 | loff_t pos; | |
231 | unsigned long next_idx[NR_CPUS]; | |
4c11d7ae SR |
232 | struct list_head *next_page[NR_CPUS]; |
233 | unsigned next_page_idx[NR_CPUS]; | |
234 | long idx; | |
bc0c38d1 SR |
235 | }; |
236 | ||
45dcd8b8 | 237 | void trace_wake_up(void); |
e309b41d | 238 | void tracing_reset(struct trace_array_cpu *data); |
bc0c38d1 SR |
239 | int tracing_open_generic(struct inode *inode, struct file *filp); |
240 | struct dentry *tracing_init_dentry(void); | |
d618b3e6 IM |
241 | void init_tracer_sysprof_debugfs(struct dentry *d_tracer); |
242 | ||
45dcd8b8 PP |
243 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
244 | struct trace_array_cpu *data); | |
245 | void tracing_generic_entry_update(struct trace_entry *entry, | |
246 | unsigned long flags); | |
247 | ||
bc0c38d1 SR |
248 | void ftrace(struct trace_array *tr, |
249 | struct trace_array_cpu *data, | |
250 | unsigned long ip, | |
251 | unsigned long parent_ip, | |
252 | unsigned long flags); | |
253 | void tracing_sched_switch_trace(struct trace_array *tr, | |
254 | struct trace_array_cpu *data, | |
255 | struct task_struct *prev, | |
256 | struct task_struct *next, | |
257 | unsigned long flags); | |
258 | void tracing_record_cmdline(struct task_struct *tsk); | |
57422797 IM |
259 | |
260 | void tracing_sched_wakeup_trace(struct trace_array *tr, | |
261 | struct trace_array_cpu *data, | |
262 | struct task_struct *wakee, | |
263 | struct task_struct *cur, | |
264 | unsigned long flags); | |
f0a920d5 IM |
265 | void trace_special(struct trace_array *tr, |
266 | struct trace_array_cpu *data, | |
267 | unsigned long arg1, | |
268 | unsigned long arg2, | |
269 | unsigned long arg3); | |
6fb44b71 SR |
270 | void trace_function(struct trace_array *tr, |
271 | struct trace_array_cpu *data, | |
272 | unsigned long ip, | |
273 | unsigned long parent_ip, | |
274 | unsigned long flags); | |
bc0c38d1 | 275 | |
41bc8144 SR |
276 | void tracing_start_cmdline_record(void); |
277 | void tracing_stop_cmdline_record(void); | |
bc0c38d1 SR |
278 | int register_tracer(struct tracer *type); |
279 | void unregister_tracer(struct tracer *type); | |
280 | ||
281 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
282 | ||
283 | extern unsigned long tracing_max_latency; | |
284 | extern unsigned long tracing_thresh; | |
285 | ||
286 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); | |
287 | void update_max_tr_single(struct trace_array *tr, | |
288 | struct task_struct *tsk, int cpu); | |
289 | ||
e309b41d | 290 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 291 | |
001b6767 SR |
292 | #ifdef CONFIG_FTRACE |
293 | void tracing_start_function_trace(void); | |
294 | void tracing_stop_function_trace(void); | |
295 | #else | |
296 | # define tracing_start_function_trace() do { } while (0) | |
297 | # define tracing_stop_function_trace() do { } while (0) | |
298 | #endif | |
299 | ||
bc0c38d1 SR |
300 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER |
301 | typedef void | |
302 | (*tracer_switch_func_t)(void *private, | |
5b82a1b0 | 303 | void *__rq, |
bc0c38d1 SR |
304 | struct task_struct *prev, |
305 | struct task_struct *next); | |
306 | ||
307 | struct tracer_switch_ops { | |
308 | tracer_switch_func_t func; | |
309 | void *private; | |
310 | struct tracer_switch_ops *next; | |
311 | }; | |
312 | ||
bc0c38d1 SR |
313 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ |
314 | ||
315 | #ifdef CONFIG_DYNAMIC_FTRACE | |
316 | extern unsigned long ftrace_update_tot_cnt; | |
d05cdb25 SR |
317 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
318 | extern int DYN_FTRACE_TEST_NAME(void); | |
bc0c38d1 SR |
319 | #endif |
320 | ||
60a11774 | 321 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
322 | extern int trace_selftest_startup_function(struct tracer *trace, |
323 | struct trace_array *tr); | |
60a11774 SR |
324 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
325 | struct trace_array *tr); | |
60a11774 SR |
326 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
327 | struct trace_array *tr); | |
60a11774 SR |
328 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
329 | struct trace_array *tr); | |
60a11774 SR |
330 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
331 | struct trace_array *tr); | |
fb1b6d8b SN |
332 | extern int trace_selftest_startup_nop(struct tracer *trace, |
333 | struct trace_array *tr); | |
60a11774 SR |
334 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
335 | struct trace_array *tr); | |
a6dd24f8 IM |
336 | extern int trace_selftest_startup_sysprof(struct tracer *trace, |
337 | struct trace_array *tr); | |
60a11774 SR |
338 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
339 | ||
c7aafc54 | 340 | extern void *head_page(struct trace_array_cpu *data); |
72829bc3 | 341 | extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...); |
fc5e27ae PP |
342 | extern void trace_seq_print_cont(struct trace_seq *s, |
343 | struct trace_iterator *iter); | |
6c6c2796 PP |
344 | extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, |
345 | size_t cnt); | |
72829bc3 | 346 | extern long ns2usecs(cycle_t nsec); |
801fe400 | 347 | extern int trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
c7aafc54 | 348 | |
4e655519 IM |
349 | extern unsigned long trace_flags; |
350 | ||
4fcdae83 SR |
351 | /* |
352 | * trace_iterator_flags is an enumeration that defines bit | |
353 | * positions into trace_flags that controls the output. | |
354 | * | |
355 | * NOTE: These bits must match the trace_options array in | |
356 | * trace.c. | |
357 | */ | |
4e655519 IM |
358 | enum trace_iterator_flags { |
359 | TRACE_ITER_PRINT_PARENT = 0x01, | |
360 | TRACE_ITER_SYM_OFFSET = 0x02, | |
361 | TRACE_ITER_SYM_ADDR = 0x04, | |
362 | TRACE_ITER_VERBOSE = 0x08, | |
363 | TRACE_ITER_RAW = 0x10, | |
364 | TRACE_ITER_HEX = 0x20, | |
365 | TRACE_ITER_BIN = 0x40, | |
366 | TRACE_ITER_BLOCK = 0x80, | |
367 | TRACE_ITER_STACKTRACE = 0x100, | |
4ac3ba41 | 368 | TRACE_ITER_SCHED_TREE = 0x200, |
f09ce573 | 369 | TRACE_ITER_PRINTK = 0x400, |
4e655519 IM |
370 | }; |
371 | ||
43a15386 FW |
372 | extern struct tracer nop_trace; |
373 | ||
bc0c38d1 | 374 | #endif /* _LINUX_KERNEL_TRACE_H */ |