Commit | Line | Data |
---|---|---|
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> | |
3928a8a2 | 8 | #include <linux/ring_buffer.h> |
bd8ac686 | 9 | #include <linux/mmiotrace.h> |
d13744cd | 10 | #include <linux/ftrace.h> |
3f5ec136 | 11 | #include <trace/boot.h> |
36994e58 | 12 | #include <trace/kmemtrace.h> |
12922110 | 13 | #include <trace/power.h> |
bc0c38d1 | 14 | |
72829bc3 TG |
15 | enum trace_type { |
16 | __TRACE_FIRST_TYPE = 0, | |
17 | ||
18 | TRACE_FN, | |
19 | TRACE_CTX, | |
20 | TRACE_WAKE, | |
21 | TRACE_STACK, | |
dd0e545f | 22 | TRACE_PRINT, |
48ead020 | 23 | TRACE_BPRINT, |
72829bc3 | 24 | TRACE_SPECIAL, |
bd8ac686 PP |
25 | TRACE_MMIO_RW, |
26 | TRACE_MMIO_MAP, | |
9f029e83 | 27 | TRACE_BRANCH, |
74239072 FW |
28 | TRACE_BOOT_CALL, |
29 | TRACE_BOOT_RET, | |
287b6e68 FW |
30 | TRACE_GRAPH_RET, |
31 | TRACE_GRAPH_ENT, | |
02b67518 | 32 | TRACE_USER_STACK, |
a93751ca | 33 | TRACE_HW_BRANCHES, |
36994e58 FW |
34 | TRACE_KMEM_ALLOC, |
35 | TRACE_KMEM_FREE, | |
f3f47a67 | 36 | TRACE_POWER, |
c71a8961 | 37 | TRACE_BLK, |
72829bc3 | 38 | |
f0868d1e | 39 | __TRACE_LAST_TYPE, |
72829bc3 TG |
40 | }; |
41 | ||
777e208d SR |
42 | /* |
43 | * The trace entry - the most basic unit of tracing. This is what | |
44 | * is printed in the end as a single line in the trace output, such as: | |
45 | * | |
46 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
47 | */ | |
48 | struct trace_entry { | |
49 | unsigned char type; | |
777e208d SR |
50 | unsigned char flags; |
51 | unsigned char preempt_count; | |
52 | int pid; | |
02b67518 | 53 | int tgid; |
777e208d SR |
54 | }; |
55 | ||
bc0c38d1 SR |
56 | /* |
57 | * Function trace entry - function address and parent function addres: | |
58 | */ | |
59 | struct ftrace_entry { | |
777e208d | 60 | struct trace_entry ent; |
bc0c38d1 SR |
61 | unsigned long ip; |
62 | unsigned long parent_ip; | |
63 | }; | |
15e6cb36 | 64 | |
287b6e68 FW |
65 | /* Function call entry */ |
66 | struct ftrace_graph_ent_entry { | |
b91facc3 | 67 | struct trace_entry ent; |
287b6e68 FW |
68 | struct ftrace_graph_ent graph_ent; |
69 | }; | |
70 | ||
15e6cb36 | 71 | /* Function return entry */ |
287b6e68 | 72 | struct ftrace_graph_ret_entry { |
b91facc3 | 73 | struct trace_entry ent; |
287b6e68 | 74 | struct ftrace_graph_ret ret; |
15e6cb36 | 75 | }; |
d13744cd | 76 | extern struct tracer boot_tracer; |
bc0c38d1 SR |
77 | |
78 | /* | |
79 | * Context switch trace entry - which task (and prio) we switched from/to: | |
80 | */ | |
81 | struct ctx_switch_entry { | |
777e208d | 82 | struct trace_entry ent; |
bc0c38d1 SR |
83 | unsigned int prev_pid; |
84 | unsigned char prev_prio; | |
85 | unsigned char prev_state; | |
86 | unsigned int next_pid; | |
87 | unsigned char next_prio; | |
bac524d3 | 88 | unsigned char next_state; |
80b5e940 | 89 | unsigned int next_cpu; |
bc0c38d1 SR |
90 | }; |
91 | ||
f0a920d5 IM |
92 | /* |
93 | * Special (free-form) trace entry: | |
94 | */ | |
95 | struct special_entry { | |
777e208d | 96 | struct trace_entry ent; |
f0a920d5 IM |
97 | unsigned long arg1; |
98 | unsigned long arg2; | |
99 | unsigned long arg3; | |
100 | }; | |
101 | ||
86387f7e IM |
102 | /* |
103 | * Stack-trace entry: | |
104 | */ | |
105 | ||
74f4e369 | 106 | #define FTRACE_STACK_ENTRIES 8 |
86387f7e IM |
107 | |
108 | struct stack_entry { | |
777e208d | 109 | struct trace_entry ent; |
86387f7e IM |
110 | unsigned long caller[FTRACE_STACK_ENTRIES]; |
111 | }; | |
112 | ||
02b67518 TE |
113 | struct userstack_entry { |
114 | struct trace_entry ent; | |
115 | unsigned long caller[FTRACE_STACK_ENTRIES]; | |
116 | }; | |
117 | ||
dd0e545f | 118 | /* |
5e1607a0 | 119 | * trace_printk entry: |
dd0e545f | 120 | */ |
48ead020 | 121 | struct bprint_entry { |
777e208d | 122 | struct trace_entry ent; |
9de36825 | 123 | unsigned long ip; |
1fd8f2a3 | 124 | int depth; |
769b0441 | 125 | const char *fmt; |
9de36825 | 126 | u32 buf[]; |
1427cdf0 | 127 | }; |
1427cdf0 | 128 | |
48ead020 FW |
129 | struct print_entry { |
130 | struct trace_entry ent; | |
131 | unsigned long ip; | |
132 | int depth; | |
133 | char buf[]; | |
134 | }; | |
135 | ||
777e208d SR |
136 | #define TRACE_OLD_SIZE 88 |
137 | ||
138 | struct trace_field_cont { | |
139 | unsigned char type; | |
140 | /* Temporary till we get rid of this completely */ | |
141 | char buf[TRACE_OLD_SIZE - 1]; | |
142 | }; | |
143 | ||
144 | struct trace_mmiotrace_rw { | |
145 | struct trace_entry ent; | |
146 | struct mmiotrace_rw rw; | |
147 | }; | |
148 | ||
149 | struct trace_mmiotrace_map { | |
150 | struct trace_entry ent; | |
151 | struct mmiotrace_map map; | |
152 | }; | |
153 | ||
74239072 | 154 | struct trace_boot_call { |
777e208d | 155 | struct trace_entry ent; |
74239072 FW |
156 | struct boot_trace_call boot_call; |
157 | }; | |
158 | ||
159 | struct trace_boot_ret { | |
160 | struct trace_entry ent; | |
161 | struct boot_trace_ret boot_ret; | |
777e208d SR |
162 | }; |
163 | ||
52f232cb SR |
164 | #define TRACE_FUNC_SIZE 30 |
165 | #define TRACE_FILE_SIZE 20 | |
9f029e83 | 166 | struct trace_branch { |
52f232cb SR |
167 | struct trace_entry ent; |
168 | unsigned line; | |
169 | char func[TRACE_FUNC_SIZE+1]; | |
170 | char file[TRACE_FILE_SIZE+1]; | |
171 | char correct; | |
172 | }; | |
173 | ||
a93751ca | 174 | struct hw_branch_entry { |
1e9b51c2 | 175 | struct trace_entry ent; |
a93751ca MM |
176 | u64 from; |
177 | u64 to; | |
1e9b51c2 MM |
178 | }; |
179 | ||
f3f47a67 AV |
180 | struct trace_power { |
181 | struct trace_entry ent; | |
182 | struct power_trace state_data; | |
183 | }; | |
184 | ||
36994e58 FW |
185 | struct kmemtrace_alloc_entry { |
186 | struct trace_entry ent; | |
187 | enum kmemtrace_type_id type_id; | |
188 | unsigned long call_site; | |
189 | const void *ptr; | |
190 | size_t bytes_req; | |
191 | size_t bytes_alloc; | |
192 | gfp_t gfp_flags; | |
193 | int node; | |
194 | }; | |
195 | ||
196 | struct kmemtrace_free_entry { | |
197 | struct trace_entry ent; | |
198 | enum kmemtrace_type_id type_id; | |
199 | unsigned long call_site; | |
200 | const void *ptr; | |
201 | }; | |
202 | ||
fc5e27ae PP |
203 | /* |
204 | * trace_flag_type is an enumeration that holds different | |
205 | * states when a trace occurs. These are: | |
9244489a | 206 | * IRQS_OFF - interrupts were disabled |
9de36825 | 207 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
9244489a SR |
208 | * NEED_RESCED - reschedule is requested |
209 | * HARDIRQ - inside an interrupt handler | |
210 | * SOFTIRQ - inside a softirq handler | |
fc5e27ae PP |
211 | */ |
212 | enum trace_flag_type { | |
213 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
214 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
215 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
216 | TRACE_FLAG_HARDIRQ = 0x08, | |
217 | TRACE_FLAG_SOFTIRQ = 0x10, | |
fc5e27ae PP |
218 | }; |
219 | ||
5bf9a1ee | 220 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 SR |
221 | |
222 | /* | |
223 | * The CPU trace array - it consists of thousands of trace entries | |
224 | * plus some other descriptor data: (for example which task started | |
225 | * the trace, etc.) | |
226 | */ | |
227 | struct trace_array_cpu { | |
bc0c38d1 | 228 | atomic_t disabled; |
2cadf913 | 229 | void *buffer_page; /* ring buffer spare */ |
4e3c3333 | 230 | |
c7aafc54 | 231 | /* these fields get copied into max-trace: */ |
c7aafc54 | 232 | unsigned long trace_idx; |
53d0aa77 | 233 | unsigned long overrun; |
bc0c38d1 SR |
234 | unsigned long saved_latency; |
235 | unsigned long critical_start; | |
236 | unsigned long critical_end; | |
237 | unsigned long critical_sequence; | |
238 | unsigned long nice; | |
239 | unsigned long policy; | |
240 | unsigned long rt_priority; | |
241 | cycle_t preempt_timestamp; | |
242 | pid_t pid; | |
243 | uid_t uid; | |
244 | char comm[TASK_COMM_LEN]; | |
245 | }; | |
246 | ||
247 | struct trace_iterator; | |
248 | ||
249 | /* | |
250 | * The trace array - an array of per-CPU trace arrays. This is the | |
251 | * highest level data structure that individual tracers deal with. | |
252 | * They have on/off state as well: | |
253 | */ | |
254 | struct trace_array { | |
3928a8a2 | 255 | struct ring_buffer *buffer; |
bc0c38d1 | 256 | unsigned long entries; |
bc0c38d1 SR |
257 | int cpu; |
258 | cycle_t time_start; | |
b3806b43 | 259 | struct task_struct *waiter; |
bc0c38d1 SR |
260 | struct trace_array_cpu *data[NR_CPUS]; |
261 | }; | |
262 | ||
7104f300 SR |
263 | #define FTRACE_CMP_TYPE(var, type) \ |
264 | __builtin_types_compatible_p(typeof(var), type *) | |
265 | ||
266 | #undef IF_ASSIGN | |
267 | #define IF_ASSIGN(var, entry, etype, id) \ | |
268 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
269 | var = (typeof(var))(entry); \ | |
270 | WARN_ON(id && (entry)->type != id); \ | |
271 | break; \ | |
272 | } | |
273 | ||
274 | /* Will cause compile errors if type is not found. */ | |
275 | extern void __ftrace_bad_type(void); | |
276 | ||
277 | /* | |
278 | * The trace_assign_type is a verifier that the entry type is | |
279 | * the same as the type being assigned. To add new types simply | |
280 | * add a line with the following format: | |
281 | * | |
282 | * IF_ASSIGN(var, ent, type, id); | |
283 | * | |
284 | * Where "type" is the trace type that includes the trace_entry | |
285 | * as the "ent" item. And "id" is the trace identifier that is | |
286 | * used in the trace_type enum. | |
287 | * | |
288 | * If the type can have more than one id, then use zero. | |
289 | */ | |
290 | #define trace_assign_type(var, ent) \ | |
291 | do { \ | |
292 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
293 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 294 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 295 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 296 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 297 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
7104f300 SR |
298 | IF_ASSIGN(var, ent, struct special_entry, 0); \ |
299 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ | |
300 | TRACE_MMIO_RW); \ | |
301 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
302 | TRACE_MMIO_MAP); \ | |
74239072 FW |
303 | IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\ |
304 | IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\ | |
9f029e83 | 305 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
306 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
307 | TRACE_GRAPH_ENT); \ | |
308 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
309 | TRACE_GRAPH_RET); \ | |
a93751ca | 310 | IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\ |
9de36825 | 311 | IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \ |
36994e58 FW |
312 | IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \ |
313 | TRACE_KMEM_ALLOC); \ | |
314 | IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \ | |
315 | TRACE_KMEM_FREE); \ | |
7104f300 SR |
316 | __ftrace_bad_type(); \ |
317 | } while (0) | |
2c4f035f FW |
318 | |
319 | /* Return values for print_line callback */ | |
320 | enum print_line_t { | |
321 | TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ | |
322 | TRACE_TYPE_HANDLED = 1, | |
b91facc3 FW |
323 | TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */ |
324 | TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */ | |
2c4f035f FW |
325 | }; |
326 | ||
adf9f195 FW |
327 | |
328 | /* | |
329 | * An option specific to a tracer. This is a boolean value. | |
330 | * The bit is the bit index that sets its value on the | |
331 | * flags value in struct tracer_flags. | |
332 | */ | |
333 | struct tracer_opt { | |
9de36825 IM |
334 | const char *name; /* Will appear on the trace_options file */ |
335 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
336 | }; |
337 | ||
338 | /* | |
339 | * The set of specific options for a tracer. Your tracer | |
340 | * have to set the initial value of the flags val. | |
341 | */ | |
342 | struct tracer_flags { | |
343 | u32 val; | |
9de36825 | 344 | struct tracer_opt *opts; |
adf9f195 FW |
345 | }; |
346 | ||
347 | /* Makes more easy to define a tracer opt */ | |
348 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
349 | ||
034939b6 | 350 | |
6eaaa5d5 FW |
351 | /** |
352 | * struct tracer - a specific tracer and its callbacks to interact with debugfs | |
353 | * @name: the name chosen to select it on the available_tracers file | |
354 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
355 | * @reset: called when one switches to another tracer | |
356 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled) | |
357 | * @stop: called when tracing is paused (echo 0 > tracing_enabled) | |
358 | * @open: called when the trace file is opened | |
359 | * @pipe_open: called when the trace_pipe file is opened | |
360 | * @wait_pipe: override how the user waits for traces on trace_pipe | |
361 | * @close: called when the trace file is released | |
362 | * @read: override the default read callback on trace_pipe | |
363 | * @splice_read: override the default splice_read callback on trace_pipe | |
364 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
365 | * @print_headers: override the first lines that describe your columns | |
366 | * @print_line: callback that prints a trace | |
367 | * @set_flag: signals one of your private flags changed (trace_options file) | |
368 | * @flags: your private flags | |
bc0c38d1 SR |
369 | */ |
370 | struct tracer { | |
371 | const char *name; | |
1c80025a | 372 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 373 | void (*reset)(struct trace_array *tr); |
9036990d SR |
374 | void (*start)(struct trace_array *tr); |
375 | void (*stop)(struct trace_array *tr); | |
bc0c38d1 | 376 | void (*open)(struct trace_iterator *iter); |
107bad8b | 377 | void (*pipe_open)(struct trace_iterator *iter); |
6eaaa5d5 | 378 | void (*wait_pipe)(struct trace_iterator *iter); |
bc0c38d1 | 379 | void (*close)(struct trace_iterator *iter); |
107bad8b SR |
380 | ssize_t (*read)(struct trace_iterator *iter, |
381 | struct file *filp, char __user *ubuf, | |
382 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
383 | ssize_t (*splice_read)(struct trace_iterator *iter, |
384 | struct file *filp, | |
385 | loff_t *ppos, | |
386 | struct pipe_inode_info *pipe, | |
387 | size_t len, | |
388 | unsigned int flags); | |
60a11774 SR |
389 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
390 | int (*selftest)(struct tracer *trace, | |
391 | struct trace_array *tr); | |
392 | #endif | |
8bba1bf5 | 393 | void (*print_header)(struct seq_file *m); |
2c4f035f | 394 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 FW |
395 | /* If you handled the flag setting, return 0 */ |
396 | int (*set_flag)(u32 old_flags, u32 bit, int set); | |
bc0c38d1 SR |
397 | struct tracer *next; |
398 | int print_max; | |
9de36825 | 399 | struct tracer_flags *flags; |
034939b6 | 400 | struct tracer_stat *stats; |
bc0c38d1 SR |
401 | }; |
402 | ||
214023c3 SR |
403 | struct trace_seq { |
404 | unsigned char buffer[PAGE_SIZE]; | |
405 | unsigned int len; | |
6c6c2796 | 406 | unsigned int readpos; |
214023c3 SR |
407 | }; |
408 | ||
f9520750 SR |
409 | static inline void |
410 | trace_seq_init(struct trace_seq *s) | |
411 | { | |
412 | s->len = 0; | |
413 | s->readpos = 0; | |
414 | } | |
415 | ||
416 | ||
b04cc6b1 FW |
417 | #define TRACE_PIPE_ALL_CPU -1 |
418 | ||
bc0c38d1 SR |
419 | /* |
420 | * Trace iterator - used by printout routines who present trace | |
421 | * results to users and which routines might sleep, etc: | |
422 | */ | |
423 | struct trace_iterator { | |
424 | struct trace_array *tr; | |
425 | struct tracer *trace; | |
107bad8b | 426 | void *private; |
b04cc6b1 | 427 | int cpu_file; |
d7350c3f FW |
428 | struct mutex mutex; |
429 | struct ring_buffer_iter *buffer_iter[NR_CPUS]; | |
4e3c3333 | 430 | |
53d0aa77 SR |
431 | /* The below is zeroed out in pipe_read */ |
432 | struct trace_seq seq; | |
bc0c38d1 | 433 | struct trace_entry *ent; |
4e3c3333 | 434 | int cpu; |
3928a8a2 | 435 | u64 ts; |
4e3c3333 | 436 | |
bc0c38d1 SR |
437 | unsigned long iter_flags; |
438 | loff_t pos; | |
4c11d7ae | 439 | long idx; |
a309720c | 440 | |
4462344e | 441 | cpumask_var_t started; |
bc0c38d1 SR |
442 | }; |
443 | ||
b6f11df2 | 444 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 445 | int tracing_is_enabled(void); |
45dcd8b8 | 446 | void trace_wake_up(void); |
3928a8a2 | 447 | void tracing_reset(struct trace_array *tr, int cpu); |
213cc060 | 448 | void tracing_reset_online_cpus(struct trace_array *tr); |
bc0c38d1 SR |
449 | int tracing_open_generic(struct inode *inode, struct file *filp); |
450 | struct dentry *tracing_init_dentry(void); | |
d618b3e6 IM |
451 | void init_tracer_sysprof_debugfs(struct dentry *d_tracer); |
452 | ||
51a763dd ACM |
453 | struct ring_buffer_event; |
454 | ||
455 | struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr, | |
456 | unsigned char type, | |
457 | unsigned long len, | |
458 | unsigned long flags, | |
459 | int pc); | |
460 | void trace_buffer_unlock_commit(struct trace_array *tr, | |
461 | struct ring_buffer_event *event, | |
462 | unsigned long flags, int pc); | |
463 | ||
ef5580d0 SR |
464 | struct ring_buffer_event * |
465 | trace_current_buffer_lock_reserve(unsigned char type, unsigned long len, | |
466 | unsigned long flags, int pc); | |
467 | void trace_current_buffer_unlock_commit(struct ring_buffer_event *event, | |
468 | unsigned long flags, int pc); | |
469 | ||
45dcd8b8 PP |
470 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
471 | struct trace_array_cpu *data); | |
c4a8e8be FW |
472 | |
473 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
474 | int *ent_cpu, u64 *ent_ts); | |
475 | ||
45dcd8b8 | 476 | void tracing_generic_entry_update(struct trace_entry *entry, |
38697053 SR |
477 | unsigned long flags, |
478 | int pc); | |
45dcd8b8 | 479 | |
6eaaa5d5 FW |
480 | void default_wait_pipe(struct trace_iterator *iter); |
481 | void poll_wait_pipe(struct trace_iterator *iter); | |
482 | ||
bc0c38d1 SR |
483 | void ftrace(struct trace_array *tr, |
484 | struct trace_array_cpu *data, | |
485 | unsigned long ip, | |
486 | unsigned long parent_ip, | |
38697053 | 487 | unsigned long flags, int pc); |
bc0c38d1 | 488 | void tracing_sched_switch_trace(struct trace_array *tr, |
bc0c38d1 SR |
489 | struct task_struct *prev, |
490 | struct task_struct *next, | |
38697053 | 491 | unsigned long flags, int pc); |
bc0c38d1 | 492 | void tracing_record_cmdline(struct task_struct *tsk); |
57422797 IM |
493 | |
494 | void tracing_sched_wakeup_trace(struct trace_array *tr, | |
57422797 IM |
495 | struct task_struct *wakee, |
496 | struct task_struct *cur, | |
38697053 | 497 | unsigned long flags, int pc); |
f0a920d5 IM |
498 | void trace_special(struct trace_array *tr, |
499 | struct trace_array_cpu *data, | |
500 | unsigned long arg1, | |
501 | unsigned long arg2, | |
38697053 | 502 | unsigned long arg3, int pc); |
6fb44b71 | 503 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
504 | unsigned long ip, |
505 | unsigned long parent_ip, | |
38697053 | 506 | unsigned long flags, int pc); |
bc0c38d1 | 507 | |
287b6e68 | 508 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 509 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1e9b51c2 | 510 | |
41bc8144 SR |
511 | void tracing_start_cmdline_record(void); |
512 | void tracing_stop_cmdline_record(void); | |
e168e051 SR |
513 | void tracing_sched_switch_assign_trace(struct trace_array *tr); |
514 | void tracing_stop_sched_switch_record(void); | |
515 | void tracing_start_sched_switch_record(void); | |
bc0c38d1 SR |
516 | int register_tracer(struct tracer *type); |
517 | void unregister_tracer(struct tracer *type); | |
518 | ||
519 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
520 | ||
521 | extern unsigned long tracing_max_latency; | |
522 | extern unsigned long tracing_thresh; | |
523 | ||
524 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); | |
525 | void update_max_tr_single(struct trace_array *tr, | |
526 | struct task_struct *tsk, int cpu); | |
527 | ||
53614991 | 528 | void __trace_stack(struct trace_array *tr, |
53614991 SR |
529 | unsigned long flags, |
530 | int skip, int pc); | |
531 | ||
e309b41d | 532 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 533 | |
bc0c38d1 SR |
534 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER |
535 | typedef void | |
536 | (*tracer_switch_func_t)(void *private, | |
5b82a1b0 | 537 | void *__rq, |
bc0c38d1 SR |
538 | struct task_struct *prev, |
539 | struct task_struct *next); | |
540 | ||
541 | struct tracer_switch_ops { | |
542 | tracer_switch_func_t func; | |
543 | void *private; | |
544 | struct tracer_switch_ops *next; | |
545 | }; | |
bc0c38d1 SR |
546 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ |
547 | ||
f7d48cbd IM |
548 | extern char *trace_find_cmdline(int pid); |
549 | ||
bc0c38d1 SR |
550 | #ifdef CONFIG_DYNAMIC_FTRACE |
551 | extern unsigned long ftrace_update_tot_cnt; | |
d05cdb25 SR |
552 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
553 | extern int DYN_FTRACE_TEST_NAME(void); | |
bc0c38d1 SR |
554 | #endif |
555 | ||
60a11774 | 556 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
557 | extern int trace_selftest_startup_function(struct tracer *trace, |
558 | struct trace_array *tr); | |
7447dce9 FW |
559 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
560 | struct trace_array *tr); | |
60a11774 SR |
561 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
562 | struct trace_array *tr); | |
60a11774 SR |
563 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
564 | struct trace_array *tr); | |
60a11774 SR |
565 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
566 | struct trace_array *tr); | |
60a11774 SR |
567 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
568 | struct trace_array *tr); | |
fb1b6d8b SN |
569 | extern int trace_selftest_startup_nop(struct tracer *trace, |
570 | struct trace_array *tr); | |
60a11774 SR |
571 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
572 | struct trace_array *tr); | |
a6dd24f8 IM |
573 | extern int trace_selftest_startup_sysprof(struct tracer *trace, |
574 | struct trace_array *tr); | |
80e5ea45 SR |
575 | extern int trace_selftest_startup_branch(struct tracer *trace, |
576 | struct trace_array *tr); | |
60a11774 SR |
577 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
578 | ||
c7aafc54 | 579 | extern void *head_page(struct trace_array_cpu *data); |
72829bc3 | 580 | extern long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 581 | extern int |
48ead020 FW |
582 | trace_vbprintk(unsigned long ip, int depth, const char *fmt, va_list args); |
583 | extern int | |
1fd8f2a3 | 584 | trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args); |
c7aafc54 | 585 | |
4e655519 IM |
586 | extern unsigned long trace_flags; |
587 | ||
15e6cb36 | 588 | /* Standard output formatting function used for function return traces */ |
fb52607a FW |
589 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
590 | extern enum print_line_t print_graph_function(struct trace_iterator *iter); | |
ea4e2bc4 SR |
591 | |
592 | #ifdef CONFIG_DYNAMIC_FTRACE | |
593 | /* TODO: make this variable */ | |
594 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
595 | extern int ftrace_graph_count; | |
596 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
597 | ||
598 | static inline int ftrace_graph_addr(unsigned long addr) | |
599 | { | |
600 | int i; | |
601 | ||
602 | if (!ftrace_graph_count || test_tsk_trace_graph(current)) | |
603 | return 1; | |
604 | ||
605 | for (i = 0; i < ftrace_graph_count; i++) { | |
606 | if (addr == ftrace_graph_funcs[i]) | |
607 | return 1; | |
608 | } | |
609 | ||
610 | return 0; | |
611 | } | |
15e6cb36 | 612 | #else |
ea4e2bc4 SR |
613 | static inline int ftrace_trace_addr(unsigned long addr) |
614 | { | |
6b253930 IM |
615 | return 1; |
616 | } | |
617 | static inline int ftrace_graph_addr(unsigned long addr) | |
618 | { | |
619 | return 1; | |
ea4e2bc4 SR |
620 | } |
621 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
622 | ||
623 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
15e6cb36 | 624 | static inline enum print_line_t |
fb52607a | 625 | print_graph_function(struct trace_iterator *iter) |
15e6cb36 FW |
626 | { |
627 | return TRACE_TYPE_UNHANDLED; | |
628 | } | |
ea4e2bc4 | 629 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 630 | |
978f3a45 | 631 | extern struct pid *ftrace_pid_trace; |
804a6851 SR |
632 | |
633 | static inline int ftrace_trace_task(struct task_struct *task) | |
634 | { | |
77d683f3 | 635 | if (!ftrace_pid_trace) |
804a6851 SR |
636 | return 1; |
637 | ||
638 | return test_tsk_trace_trace(task); | |
639 | } | |
640 | ||
4fcdae83 SR |
641 | /* |
642 | * trace_iterator_flags is an enumeration that defines bit | |
643 | * positions into trace_flags that controls the output. | |
644 | * | |
645 | * NOTE: These bits must match the trace_options array in | |
646 | * trace.c. | |
647 | */ | |
4e655519 IM |
648 | enum trace_iterator_flags { |
649 | TRACE_ITER_PRINT_PARENT = 0x01, | |
650 | TRACE_ITER_SYM_OFFSET = 0x02, | |
651 | TRACE_ITER_SYM_ADDR = 0x04, | |
652 | TRACE_ITER_VERBOSE = 0x08, | |
653 | TRACE_ITER_RAW = 0x10, | |
654 | TRACE_ITER_HEX = 0x20, | |
655 | TRACE_ITER_BIN = 0x40, | |
656 | TRACE_ITER_BLOCK = 0x80, | |
657 | TRACE_ITER_STACKTRACE = 0x100, | |
4ac3ba41 | 658 | TRACE_ITER_SCHED_TREE = 0x200, |
f09ce573 | 659 | TRACE_ITER_PRINTK = 0x400, |
b2a866f9 | 660 | TRACE_ITER_PREEMPTONLY = 0x800, |
9f029e83 | 661 | TRACE_ITER_BRANCH = 0x1000, |
12ef7d44 | 662 | TRACE_ITER_ANNOTATE = 0x2000, |
b54d3de9 | 663 | TRACE_ITER_USERSTACKTRACE = 0x4000, |
66896a85 | 664 | TRACE_ITER_SYM_USEROBJ = 0x8000, |
c4a8e8be | 665 | TRACE_ITER_PRINTK_MSGONLY = 0x10000, |
c032ef64 SR |
666 | TRACE_ITER_CONTEXT_INFO = 0x20000, /* Print pid/cpu/time */ |
667 | TRACE_ITER_LATENCY_FMT = 0x40000, | |
4e655519 IM |
668 | }; |
669 | ||
15e6cb36 FW |
670 | /* |
671 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
672 | * control the output of kernel symbols. | |
673 | */ | |
674 | #define TRACE_ITER_SYM_MASK \ | |
675 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
676 | ||
43a15386 FW |
677 | extern struct tracer nop_trace; |
678 | ||
8f0a056f SR |
679 | /** |
680 | * ftrace_preempt_disable - disable preemption scheduler safe | |
681 | * | |
682 | * When tracing can happen inside the scheduler, there exists | |
683 | * cases that the tracing might happen before the need_resched | |
684 | * flag is checked. If this happens and the tracer calls | |
685 | * preempt_enable (after a disable), a schedule might take place | |
686 | * causing an infinite recursion. | |
687 | * | |
57794a9d | 688 | * To prevent this, we read the need_resched flag before |
8f0a056f SR |
689 | * disabling preemption. When we want to enable preemption we |
690 | * check the flag, if it is set, then we call preempt_enable_no_resched. | |
691 | * Otherwise, we call preempt_enable. | |
692 | * | |
57794a9d | 693 | * The rational for doing the above is that if need_resched is set |
8f0a056f SR |
694 | * and we have yet to reschedule, we are either in an atomic location |
695 | * (where we do not need to check for scheduling) or we are inside | |
696 | * the scheduler and do not want to resched. | |
697 | */ | |
698 | static inline int ftrace_preempt_disable(void) | |
699 | { | |
700 | int resched; | |
701 | ||
702 | resched = need_resched(); | |
703 | preempt_disable_notrace(); | |
704 | ||
705 | return resched; | |
706 | } | |
707 | ||
708 | /** | |
709 | * ftrace_preempt_enable - enable preemption scheduler safe | |
710 | * @resched: the return value from ftrace_preempt_disable | |
711 | * | |
712 | * This is a scheduler safe way to enable preemption and not miss | |
713 | * any preemption checks. The disabled saved the state of preemption. | |
57794a9d | 714 | * If resched is set, then we are either inside an atomic or |
8f0a056f SR |
715 | * are inside the scheduler (we would have already scheduled |
716 | * otherwise). In this case, we do not want to call normal | |
717 | * preempt_enable, but preempt_enable_no_resched instead. | |
718 | */ | |
719 | static inline void ftrace_preempt_enable(int resched) | |
720 | { | |
721 | if (resched) | |
722 | preempt_enable_no_resched_notrace(); | |
723 | else | |
724 | preempt_enable_notrace(); | |
725 | } | |
726 | ||
2ed84eeb | 727 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
728 | extern int enable_branch_tracing(struct trace_array *tr); |
729 | extern void disable_branch_tracing(void); | |
730 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 731 | { |
9f029e83 SR |
732 | if (trace_flags & TRACE_ITER_BRANCH) |
733 | return enable_branch_tracing(tr); | |
52f232cb SR |
734 | return 0; |
735 | } | |
9f029e83 | 736 | static inline void trace_branch_disable(void) |
52f232cb SR |
737 | { |
738 | /* due to races, always disable */ | |
9f029e83 | 739 | disable_branch_tracing(); |
52f232cb SR |
740 | } |
741 | #else | |
9f029e83 | 742 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
743 | { |
744 | return 0; | |
745 | } | |
9f029e83 | 746 | static inline void trace_branch_disable(void) |
52f232cb SR |
747 | { |
748 | } | |
2ed84eeb | 749 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 750 | |
1852fcce SR |
751 | /* set ring buffers to default size if not already done so */ |
752 | int tracing_update_buffers(void); | |
753 | ||
fd994989 SR |
754 | /* trace event type bit fields, not numeric */ |
755 | enum { | |
756 | TRACE_EVENT_TYPE_PRINTF = 1, | |
757 | TRACE_EVENT_TYPE_RAW = 2, | |
758 | }; | |
759 | ||
c32e827b SR |
760 | struct ftrace_event_call { |
761 | char *name; | |
762 | char *system; | |
763 | struct dentry *dir; | |
764 | int enabled; | |
765 | int (*regfunc)(void); | |
766 | void (*unregfunc)(void); | |
767 | int id; | |
c32e827b | 768 | int (*raw_init)(void); |
981d081e | 769 | int (*show_format)(struct trace_seq *s); |
c32e827b SR |
770 | }; |
771 | ||
772 | void event_trace_printk(unsigned long ip, const char *fmt, ...); | |
773 | extern struct ftrace_event_call __start_ftrace_events[]; | |
774 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
775 | ||
e9fb2b6d SR |
776 | extern const char *__start___trace_bprintk_fmt[]; |
777 | extern const char *__stop___trace_bprintk_fmt[]; | |
778 | ||
bdc06758 SR |
779 | /* |
780 | * The double __builtin_constant_p is because gcc will give us an error | |
781 | * if we try to allocate the static variable to fmt if it is not a | |
782 | * constant. Even with the outer if statement optimizing out. | |
783 | */ | |
e9fb2b6d SR |
784 | #define event_trace_printk(ip, fmt, args...) \ |
785 | do { \ | |
786 | __trace_printk_check_format(fmt, ##args); \ | |
787 | tracing_record_cmdline(current); \ | |
788 | if (__builtin_constant_p(fmt)) { \ | |
789 | static const char *trace_printk_fmt \ | |
790 | __attribute__((section("__trace_printk_fmt"))) = \ | |
791 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
792 | \ | |
793 | __trace_bprintk(ip, trace_printk_fmt, ##args); \ | |
794 | } else \ | |
795 | __trace_printk(ip, fmt, ##args); \ | |
796 | } while (0) | |
797 | ||
bc0c38d1 | 798 | #endif /* _LINUX_KERNEL_TRACE_H */ |