Commit | Line | Data |
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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> | |
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> |
02af61bb | 12 | #include <linux/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, |
ee08c6ec FW |
34 | TRACE_SYSCALL_ENTER, |
35 | TRACE_SYSCALL_EXIT, | |
36994e58 FW |
36 | TRACE_KMEM_ALLOC, |
37 | TRACE_KMEM_FREE, | |
f3f47a67 | 38 | TRACE_POWER, |
c71a8961 | 39 | TRACE_BLK, |
72829bc3 | 40 | |
f0868d1e | 41 | __TRACE_LAST_TYPE, |
72829bc3 TG |
42 | }; |
43 | ||
777e208d SR |
44 | /* |
45 | * The trace entry - the most basic unit of tracing. This is what | |
46 | * is printed in the end as a single line in the trace output, such as: | |
47 | * | |
48 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
49 | */ | |
50 | struct trace_entry { | |
51 | unsigned char type; | |
777e208d SR |
52 | unsigned char flags; |
53 | unsigned char preempt_count; | |
54 | int pid; | |
02b67518 | 55 | int tgid; |
777e208d SR |
56 | }; |
57 | ||
bc0c38d1 SR |
58 | /* |
59 | * Function trace entry - function address and parent function addres: | |
60 | */ | |
61 | struct ftrace_entry { | |
777e208d | 62 | struct trace_entry ent; |
bc0c38d1 SR |
63 | unsigned long ip; |
64 | unsigned long parent_ip; | |
65 | }; | |
15e6cb36 | 66 | |
287b6e68 FW |
67 | /* Function call entry */ |
68 | struct ftrace_graph_ent_entry { | |
b91facc3 | 69 | struct trace_entry ent; |
287b6e68 FW |
70 | struct ftrace_graph_ent graph_ent; |
71 | }; | |
72 | ||
15e6cb36 | 73 | /* Function return entry */ |
287b6e68 | 74 | struct ftrace_graph_ret_entry { |
b91facc3 | 75 | struct trace_entry ent; |
287b6e68 | 76 | struct ftrace_graph_ret ret; |
15e6cb36 | 77 | }; |
d13744cd | 78 | extern struct tracer boot_tracer; |
bc0c38d1 SR |
79 | |
80 | /* | |
81 | * Context switch trace entry - which task (and prio) we switched from/to: | |
82 | */ | |
83 | struct ctx_switch_entry { | |
777e208d | 84 | struct trace_entry ent; |
bc0c38d1 SR |
85 | unsigned int prev_pid; |
86 | unsigned char prev_prio; | |
87 | unsigned char prev_state; | |
88 | unsigned int next_pid; | |
89 | unsigned char next_prio; | |
bac524d3 | 90 | unsigned char next_state; |
80b5e940 | 91 | unsigned int next_cpu; |
bc0c38d1 SR |
92 | }; |
93 | ||
f0a920d5 IM |
94 | /* |
95 | * Special (free-form) trace entry: | |
96 | */ | |
97 | struct special_entry { | |
777e208d | 98 | struct trace_entry ent; |
f0a920d5 IM |
99 | unsigned long arg1; |
100 | unsigned long arg2; | |
101 | unsigned long arg3; | |
102 | }; | |
103 | ||
86387f7e IM |
104 | /* |
105 | * Stack-trace entry: | |
106 | */ | |
107 | ||
74f4e369 | 108 | #define FTRACE_STACK_ENTRIES 8 |
86387f7e IM |
109 | |
110 | struct stack_entry { | |
777e208d | 111 | struct trace_entry ent; |
86387f7e IM |
112 | unsigned long caller[FTRACE_STACK_ENTRIES]; |
113 | }; | |
114 | ||
02b67518 TE |
115 | struct userstack_entry { |
116 | struct trace_entry ent; | |
117 | unsigned long caller[FTRACE_STACK_ENTRIES]; | |
118 | }; | |
119 | ||
dd0e545f | 120 | /* |
5e1607a0 | 121 | * trace_printk entry: |
dd0e545f | 122 | */ |
48ead020 | 123 | struct bprint_entry { |
777e208d | 124 | struct trace_entry ent; |
9de36825 | 125 | unsigned long ip; |
769b0441 | 126 | const char *fmt; |
9de36825 | 127 | u32 buf[]; |
1427cdf0 | 128 | }; |
1427cdf0 | 129 | |
48ead020 FW |
130 | struct print_entry { |
131 | struct trace_entry ent; | |
132 | unsigned long ip; | |
48ead020 FW |
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 | ||
ca2b84cb EGM |
185 | enum kmemtrace_type_id { |
186 | KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */ | |
187 | KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */ | |
188 | KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */ | |
189 | }; | |
190 | ||
36994e58 FW |
191 | struct kmemtrace_alloc_entry { |
192 | struct trace_entry ent; | |
193 | enum kmemtrace_type_id type_id; | |
194 | unsigned long call_site; | |
195 | const void *ptr; | |
196 | size_t bytes_req; | |
197 | size_t bytes_alloc; | |
198 | gfp_t gfp_flags; | |
199 | int node; | |
200 | }; | |
201 | ||
202 | struct kmemtrace_free_entry { | |
203 | struct trace_entry ent; | |
204 | enum kmemtrace_type_id type_id; | |
205 | unsigned long call_site; | |
206 | const void *ptr; | |
207 | }; | |
208 | ||
bed1ffca FW |
209 | struct syscall_trace_enter { |
210 | struct trace_entry ent; | |
211 | int nr; | |
212 | unsigned long args[]; | |
213 | }; | |
214 | ||
215 | struct syscall_trace_exit { | |
216 | struct trace_entry ent; | |
217 | int nr; | |
218 | unsigned long ret; | |
219 | }; | |
220 | ||
221 | ||
fc5e27ae PP |
222 | /* |
223 | * trace_flag_type is an enumeration that holds different | |
224 | * states when a trace occurs. These are: | |
9244489a | 225 | * IRQS_OFF - interrupts were disabled |
9de36825 | 226 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
9244489a SR |
227 | * NEED_RESCED - reschedule is requested |
228 | * HARDIRQ - inside an interrupt handler | |
229 | * SOFTIRQ - inside a softirq handler | |
fc5e27ae PP |
230 | */ |
231 | enum trace_flag_type { | |
232 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
233 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
234 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
235 | TRACE_FLAG_HARDIRQ = 0x08, | |
236 | TRACE_FLAG_SOFTIRQ = 0x10, | |
fc5e27ae PP |
237 | }; |
238 | ||
5bf9a1ee | 239 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 SR |
240 | |
241 | /* | |
242 | * The CPU trace array - it consists of thousands of trace entries | |
243 | * plus some other descriptor data: (for example which task started | |
244 | * the trace, etc.) | |
245 | */ | |
246 | struct trace_array_cpu { | |
bc0c38d1 | 247 | atomic_t disabled; |
2cadf913 | 248 | void *buffer_page; /* ring buffer spare */ |
4e3c3333 | 249 | |
c7aafc54 | 250 | /* these fields get copied into max-trace: */ |
c7aafc54 | 251 | unsigned long trace_idx; |
53d0aa77 | 252 | unsigned long overrun; |
bc0c38d1 SR |
253 | unsigned long saved_latency; |
254 | unsigned long critical_start; | |
255 | unsigned long critical_end; | |
256 | unsigned long critical_sequence; | |
257 | unsigned long nice; | |
258 | unsigned long policy; | |
259 | unsigned long rt_priority; | |
260 | cycle_t preempt_timestamp; | |
261 | pid_t pid; | |
262 | uid_t uid; | |
263 | char comm[TASK_COMM_LEN]; | |
264 | }; | |
265 | ||
266 | struct trace_iterator; | |
267 | ||
268 | /* | |
269 | * The trace array - an array of per-CPU trace arrays. This is the | |
270 | * highest level data structure that individual tracers deal with. | |
271 | * They have on/off state as well: | |
272 | */ | |
273 | struct trace_array { | |
3928a8a2 | 274 | struct ring_buffer *buffer; |
bc0c38d1 | 275 | unsigned long entries; |
bc0c38d1 SR |
276 | int cpu; |
277 | cycle_t time_start; | |
b3806b43 | 278 | struct task_struct *waiter; |
bc0c38d1 SR |
279 | struct trace_array_cpu *data[NR_CPUS]; |
280 | }; | |
281 | ||
7104f300 SR |
282 | #define FTRACE_CMP_TYPE(var, type) \ |
283 | __builtin_types_compatible_p(typeof(var), type *) | |
284 | ||
285 | #undef IF_ASSIGN | |
286 | #define IF_ASSIGN(var, entry, etype, id) \ | |
287 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
288 | var = (typeof(var))(entry); \ | |
289 | WARN_ON(id && (entry)->type != id); \ | |
290 | break; \ | |
291 | } | |
292 | ||
293 | /* Will cause compile errors if type is not found. */ | |
294 | extern void __ftrace_bad_type(void); | |
295 | ||
296 | /* | |
297 | * The trace_assign_type is a verifier that the entry type is | |
298 | * the same as the type being assigned. To add new types simply | |
299 | * add a line with the following format: | |
300 | * | |
301 | * IF_ASSIGN(var, ent, type, id); | |
302 | * | |
303 | * Where "type" is the trace type that includes the trace_entry | |
304 | * as the "ent" item. And "id" is the trace identifier that is | |
305 | * used in the trace_type enum. | |
306 | * | |
307 | * If the type can have more than one id, then use zero. | |
308 | */ | |
309 | #define trace_assign_type(var, ent) \ | |
310 | do { \ | |
311 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
312 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 313 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 314 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 315 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 316 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
7104f300 SR |
317 | IF_ASSIGN(var, ent, struct special_entry, 0); \ |
318 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ | |
319 | TRACE_MMIO_RW); \ | |
320 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
321 | TRACE_MMIO_MAP); \ | |
74239072 FW |
322 | IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\ |
323 | IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\ | |
9f029e83 | 324 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
325 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
326 | TRACE_GRAPH_ENT); \ | |
327 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
328 | TRACE_GRAPH_RET); \ | |
a93751ca | 329 | IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\ |
9de36825 | 330 | IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \ |
36994e58 FW |
331 | IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \ |
332 | TRACE_KMEM_ALLOC); \ | |
333 | IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \ | |
334 | TRACE_KMEM_FREE); \ | |
bed1ffca FW |
335 | IF_ASSIGN(var, ent, struct syscall_trace_enter, \ |
336 | TRACE_SYSCALL_ENTER); \ | |
337 | IF_ASSIGN(var, ent, struct syscall_trace_exit, \ | |
338 | TRACE_SYSCALL_EXIT); \ | |
7104f300 SR |
339 | __ftrace_bad_type(); \ |
340 | } while (0) | |
2c4f035f FW |
341 | |
342 | /* Return values for print_line callback */ | |
343 | enum print_line_t { | |
344 | TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ | |
345 | TRACE_TYPE_HANDLED = 1, | |
b91facc3 FW |
346 | TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */ |
347 | TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */ | |
2c4f035f FW |
348 | }; |
349 | ||
adf9f195 FW |
350 | |
351 | /* | |
352 | * An option specific to a tracer. This is a boolean value. | |
353 | * The bit is the bit index that sets its value on the | |
354 | * flags value in struct tracer_flags. | |
355 | */ | |
356 | struct tracer_opt { | |
9de36825 IM |
357 | const char *name; /* Will appear on the trace_options file */ |
358 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
359 | }; |
360 | ||
361 | /* | |
362 | * The set of specific options for a tracer. Your tracer | |
363 | * have to set the initial value of the flags val. | |
364 | */ | |
365 | struct tracer_flags { | |
366 | u32 val; | |
9de36825 | 367 | struct tracer_opt *opts; |
adf9f195 FW |
368 | }; |
369 | ||
370 | /* Makes more easy to define a tracer opt */ | |
371 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
372 | ||
034939b6 | 373 | |
6eaaa5d5 FW |
374 | /** |
375 | * struct tracer - a specific tracer and its callbacks to interact with debugfs | |
376 | * @name: the name chosen to select it on the available_tracers file | |
377 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
378 | * @reset: called when one switches to another tracer | |
379 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled) | |
380 | * @stop: called when tracing is paused (echo 0 > tracing_enabled) | |
381 | * @open: called when the trace file is opened | |
382 | * @pipe_open: called when the trace_pipe file is opened | |
383 | * @wait_pipe: override how the user waits for traces on trace_pipe | |
384 | * @close: called when the trace file is released | |
385 | * @read: override the default read callback on trace_pipe | |
386 | * @splice_read: override the default splice_read callback on trace_pipe | |
387 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
388 | * @print_headers: override the first lines that describe your columns | |
389 | * @print_line: callback that prints a trace | |
390 | * @set_flag: signals one of your private flags changed (trace_options file) | |
391 | * @flags: your private flags | |
bc0c38d1 SR |
392 | */ |
393 | struct tracer { | |
394 | const char *name; | |
1c80025a | 395 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 396 | void (*reset)(struct trace_array *tr); |
9036990d SR |
397 | void (*start)(struct trace_array *tr); |
398 | void (*stop)(struct trace_array *tr); | |
bc0c38d1 | 399 | void (*open)(struct trace_iterator *iter); |
107bad8b | 400 | void (*pipe_open)(struct trace_iterator *iter); |
6eaaa5d5 | 401 | void (*wait_pipe)(struct trace_iterator *iter); |
bc0c38d1 | 402 | void (*close)(struct trace_iterator *iter); |
107bad8b SR |
403 | ssize_t (*read)(struct trace_iterator *iter, |
404 | struct file *filp, char __user *ubuf, | |
405 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
406 | ssize_t (*splice_read)(struct trace_iterator *iter, |
407 | struct file *filp, | |
408 | loff_t *ppos, | |
409 | struct pipe_inode_info *pipe, | |
410 | size_t len, | |
411 | unsigned int flags); | |
60a11774 SR |
412 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
413 | int (*selftest)(struct tracer *trace, | |
414 | struct trace_array *tr); | |
415 | #endif | |
8bba1bf5 | 416 | void (*print_header)(struct seq_file *m); |
2c4f035f | 417 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 FW |
418 | /* If you handled the flag setting, return 0 */ |
419 | int (*set_flag)(u32 old_flags, u32 bit, int set); | |
bc0c38d1 SR |
420 | struct tracer *next; |
421 | int print_max; | |
9de36825 | 422 | struct tracer_flags *flags; |
034939b6 | 423 | struct tracer_stat *stats; |
bc0c38d1 SR |
424 | }; |
425 | ||
214023c3 SR |
426 | struct trace_seq { |
427 | unsigned char buffer[PAGE_SIZE]; | |
428 | unsigned int len; | |
6c6c2796 | 429 | unsigned int readpos; |
214023c3 SR |
430 | }; |
431 | ||
f9520750 SR |
432 | static inline void |
433 | trace_seq_init(struct trace_seq *s) | |
434 | { | |
435 | s->len = 0; | |
436 | s->readpos = 0; | |
437 | } | |
438 | ||
439 | ||
b04cc6b1 FW |
440 | #define TRACE_PIPE_ALL_CPU -1 |
441 | ||
bc0c38d1 SR |
442 | /* |
443 | * Trace iterator - used by printout routines who present trace | |
444 | * results to users and which routines might sleep, etc: | |
445 | */ | |
446 | struct trace_iterator { | |
447 | struct trace_array *tr; | |
448 | struct tracer *trace; | |
107bad8b | 449 | void *private; |
b04cc6b1 | 450 | int cpu_file; |
d7350c3f FW |
451 | struct mutex mutex; |
452 | struct ring_buffer_iter *buffer_iter[NR_CPUS]; | |
4e3c3333 | 453 | |
53d0aa77 SR |
454 | /* The below is zeroed out in pipe_read */ |
455 | struct trace_seq seq; | |
bc0c38d1 | 456 | struct trace_entry *ent; |
4e3c3333 | 457 | int cpu; |
3928a8a2 | 458 | u64 ts; |
4e3c3333 | 459 | |
bc0c38d1 SR |
460 | unsigned long iter_flags; |
461 | loff_t pos; | |
4c11d7ae | 462 | long idx; |
a309720c | 463 | |
4462344e | 464 | cpumask_var_t started; |
bc0c38d1 SR |
465 | }; |
466 | ||
b6f11df2 | 467 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 468 | int tracing_is_enabled(void); |
45dcd8b8 | 469 | void trace_wake_up(void); |
3928a8a2 | 470 | void tracing_reset(struct trace_array *tr, int cpu); |
213cc060 | 471 | void tracing_reset_online_cpus(struct trace_array *tr); |
bc0c38d1 | 472 | int tracing_open_generic(struct inode *inode, struct file *filp); |
5452af66 FW |
473 | struct dentry *trace_create_file(const char *name, |
474 | mode_t mode, | |
475 | struct dentry *parent, | |
476 | void *data, | |
477 | const struct file_operations *fops); | |
478 | ||
bc0c38d1 | 479 | struct dentry *tracing_init_dentry(void); |
d618b3e6 IM |
480 | void init_tracer_sysprof_debugfs(struct dentry *d_tracer); |
481 | ||
51a763dd ACM |
482 | struct ring_buffer_event; |
483 | ||
484 | struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr, | |
485 | unsigned char type, | |
486 | unsigned long len, | |
487 | unsigned long flags, | |
488 | int pc); | |
489 | void trace_buffer_unlock_commit(struct trace_array *tr, | |
490 | struct ring_buffer_event *event, | |
491 | unsigned long flags, int pc); | |
492 | ||
ef5580d0 SR |
493 | struct ring_buffer_event * |
494 | trace_current_buffer_lock_reserve(unsigned char type, unsigned long len, | |
495 | unsigned long flags, int pc); | |
496 | void trace_current_buffer_unlock_commit(struct ring_buffer_event *event, | |
497 | unsigned long flags, int pc); | |
07edf712 FW |
498 | void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event, |
499 | unsigned long flags, int pc); | |
77d9f465 | 500 | void trace_current_buffer_discard_commit(struct ring_buffer_event *event); |
ef5580d0 | 501 | |
45dcd8b8 PP |
502 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
503 | struct trace_array_cpu *data); | |
c4a8e8be FW |
504 | |
505 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
506 | int *ent_cpu, u64 *ent_ts); | |
507 | ||
45dcd8b8 | 508 | void tracing_generic_entry_update(struct trace_entry *entry, |
38697053 SR |
509 | unsigned long flags, |
510 | int pc); | |
45dcd8b8 | 511 | |
6eaaa5d5 FW |
512 | void default_wait_pipe(struct trace_iterator *iter); |
513 | void poll_wait_pipe(struct trace_iterator *iter); | |
514 | ||
bc0c38d1 SR |
515 | void ftrace(struct trace_array *tr, |
516 | struct trace_array_cpu *data, | |
517 | unsigned long ip, | |
518 | unsigned long parent_ip, | |
38697053 | 519 | unsigned long flags, int pc); |
bc0c38d1 | 520 | void tracing_sched_switch_trace(struct trace_array *tr, |
bc0c38d1 SR |
521 | struct task_struct *prev, |
522 | struct task_struct *next, | |
38697053 | 523 | unsigned long flags, int pc); |
bc0c38d1 | 524 | void tracing_record_cmdline(struct task_struct *tsk); |
57422797 IM |
525 | |
526 | void tracing_sched_wakeup_trace(struct trace_array *tr, | |
57422797 IM |
527 | struct task_struct *wakee, |
528 | struct task_struct *cur, | |
38697053 | 529 | unsigned long flags, int pc); |
f0a920d5 IM |
530 | void trace_special(struct trace_array *tr, |
531 | struct trace_array_cpu *data, | |
532 | unsigned long arg1, | |
533 | unsigned long arg2, | |
38697053 | 534 | unsigned long arg3, int pc); |
6fb44b71 | 535 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
536 | unsigned long ip, |
537 | unsigned long parent_ip, | |
38697053 | 538 | unsigned long flags, int pc); |
bc0c38d1 | 539 | |
287b6e68 | 540 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 541 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1e9b51c2 | 542 | |
41bc8144 SR |
543 | void tracing_start_cmdline_record(void); |
544 | void tracing_stop_cmdline_record(void); | |
e168e051 SR |
545 | void tracing_sched_switch_assign_trace(struct trace_array *tr); |
546 | void tracing_stop_sched_switch_record(void); | |
547 | void tracing_start_sched_switch_record(void); | |
bc0c38d1 SR |
548 | int register_tracer(struct tracer *type); |
549 | void unregister_tracer(struct tracer *type); | |
550 | ||
551 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
552 | ||
553 | extern unsigned long tracing_max_latency; | |
554 | extern unsigned long tracing_thresh; | |
555 | ||
556 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); | |
557 | void update_max_tr_single(struct trace_array *tr, | |
558 | struct task_struct *tsk, int cpu); | |
559 | ||
53614991 | 560 | void __trace_stack(struct trace_array *tr, |
53614991 SR |
561 | unsigned long flags, |
562 | int skip, int pc); | |
563 | ||
e309b41d | 564 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 565 | |
bc0c38d1 SR |
566 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER |
567 | typedef void | |
568 | (*tracer_switch_func_t)(void *private, | |
5b82a1b0 | 569 | void *__rq, |
bc0c38d1 SR |
570 | struct task_struct *prev, |
571 | struct task_struct *next); | |
572 | ||
573 | struct tracer_switch_ops { | |
574 | tracer_switch_func_t func; | |
575 | void *private; | |
576 | struct tracer_switch_ops *next; | |
577 | }; | |
bc0c38d1 SR |
578 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ |
579 | ||
4ca53085 | 580 | extern void trace_find_cmdline(int pid, char comm[]); |
f7d48cbd | 581 | |
bc0c38d1 SR |
582 | #ifdef CONFIG_DYNAMIC_FTRACE |
583 | extern unsigned long ftrace_update_tot_cnt; | |
d05cdb25 SR |
584 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
585 | extern int DYN_FTRACE_TEST_NAME(void); | |
bc0c38d1 SR |
586 | #endif |
587 | ||
60a11774 | 588 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
589 | extern int trace_selftest_startup_function(struct tracer *trace, |
590 | struct trace_array *tr); | |
7447dce9 FW |
591 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
592 | struct trace_array *tr); | |
60a11774 SR |
593 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
594 | struct trace_array *tr); | |
60a11774 SR |
595 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
596 | struct trace_array *tr); | |
60a11774 SR |
597 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
598 | struct trace_array *tr); | |
60a11774 SR |
599 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
600 | struct trace_array *tr); | |
fb1b6d8b SN |
601 | extern int trace_selftest_startup_nop(struct tracer *trace, |
602 | struct trace_array *tr); | |
60a11774 SR |
603 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
604 | struct trace_array *tr); | |
a6dd24f8 IM |
605 | extern int trace_selftest_startup_sysprof(struct tracer *trace, |
606 | struct trace_array *tr); | |
80e5ea45 SR |
607 | extern int trace_selftest_startup_branch(struct tracer *trace, |
608 | struct trace_array *tr); | |
60a11774 SR |
609 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
610 | ||
c7aafc54 | 611 | extern void *head_page(struct trace_array_cpu *data); |
cf8e3474 | 612 | extern unsigned long long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 613 | extern int |
40ce74f1 | 614 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 615 | extern int |
40ce74f1 | 616 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
c7aafc54 | 617 | |
4e655519 IM |
618 | extern unsigned long trace_flags; |
619 | ||
15e6cb36 | 620 | /* Standard output formatting function used for function return traces */ |
fb52607a FW |
621 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
622 | extern enum print_line_t print_graph_function(struct trace_iterator *iter); | |
0706f1c4 SR |
623 | extern enum print_line_t |
624 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); | |
ea4e2bc4 SR |
625 | |
626 | #ifdef CONFIG_DYNAMIC_FTRACE | |
627 | /* TODO: make this variable */ | |
628 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
629 | extern int ftrace_graph_count; | |
630 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
631 | ||
632 | static inline int ftrace_graph_addr(unsigned long addr) | |
633 | { | |
634 | int i; | |
635 | ||
636 | if (!ftrace_graph_count || test_tsk_trace_graph(current)) | |
637 | return 1; | |
638 | ||
639 | for (i = 0; i < ftrace_graph_count; i++) { | |
640 | if (addr == ftrace_graph_funcs[i]) | |
641 | return 1; | |
642 | } | |
643 | ||
644 | return 0; | |
645 | } | |
15e6cb36 | 646 | #else |
ea4e2bc4 SR |
647 | static inline int ftrace_trace_addr(unsigned long addr) |
648 | { | |
6b253930 IM |
649 | return 1; |
650 | } | |
651 | static inline int ftrace_graph_addr(unsigned long addr) | |
652 | { | |
653 | return 1; | |
ea4e2bc4 SR |
654 | } |
655 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
ea4e2bc4 | 656 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 657 | static inline enum print_line_t |
fb52607a | 658 | print_graph_function(struct trace_iterator *iter) |
15e6cb36 FW |
659 | { |
660 | return TRACE_TYPE_UNHANDLED; | |
661 | } | |
ea4e2bc4 | 662 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 663 | |
978f3a45 | 664 | extern struct pid *ftrace_pid_trace; |
804a6851 SR |
665 | |
666 | static inline int ftrace_trace_task(struct task_struct *task) | |
667 | { | |
77d683f3 | 668 | if (!ftrace_pid_trace) |
804a6851 SR |
669 | return 1; |
670 | ||
671 | return test_tsk_trace_trace(task); | |
672 | } | |
673 | ||
4fcdae83 SR |
674 | /* |
675 | * trace_iterator_flags is an enumeration that defines bit | |
676 | * positions into trace_flags that controls the output. | |
677 | * | |
678 | * NOTE: These bits must match the trace_options array in | |
679 | * trace.c. | |
680 | */ | |
4e655519 IM |
681 | enum trace_iterator_flags { |
682 | TRACE_ITER_PRINT_PARENT = 0x01, | |
683 | TRACE_ITER_SYM_OFFSET = 0x02, | |
684 | TRACE_ITER_SYM_ADDR = 0x04, | |
685 | TRACE_ITER_VERBOSE = 0x08, | |
686 | TRACE_ITER_RAW = 0x10, | |
687 | TRACE_ITER_HEX = 0x20, | |
688 | TRACE_ITER_BIN = 0x40, | |
689 | TRACE_ITER_BLOCK = 0x80, | |
690 | TRACE_ITER_STACKTRACE = 0x100, | |
4ac3ba41 | 691 | TRACE_ITER_SCHED_TREE = 0x200, |
f09ce573 | 692 | TRACE_ITER_PRINTK = 0x400, |
b2a866f9 | 693 | TRACE_ITER_PREEMPTONLY = 0x800, |
9f029e83 | 694 | TRACE_ITER_BRANCH = 0x1000, |
12ef7d44 | 695 | TRACE_ITER_ANNOTATE = 0x2000, |
b54d3de9 | 696 | TRACE_ITER_USERSTACKTRACE = 0x4000, |
66896a85 | 697 | TRACE_ITER_SYM_USEROBJ = 0x8000, |
c4a8e8be | 698 | TRACE_ITER_PRINTK_MSGONLY = 0x10000, |
c032ef64 SR |
699 | TRACE_ITER_CONTEXT_INFO = 0x20000, /* Print pid/cpu/time */ |
700 | TRACE_ITER_LATENCY_FMT = 0x40000, | |
af4617bd | 701 | TRACE_ITER_GLOBAL_CLK = 0x80000, |
be6f164a | 702 | TRACE_ITER_SLEEP_TIME = 0x100000, |
a2a16d6a | 703 | TRACE_ITER_GRAPH_TIME = 0x200000, |
4e655519 IM |
704 | }; |
705 | ||
15e6cb36 FW |
706 | /* |
707 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
708 | * control the output of kernel symbols. | |
709 | */ | |
710 | #define TRACE_ITER_SYM_MASK \ | |
711 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
712 | ||
43a15386 FW |
713 | extern struct tracer nop_trace; |
714 | ||
8f0a056f SR |
715 | /** |
716 | * ftrace_preempt_disable - disable preemption scheduler safe | |
717 | * | |
718 | * When tracing can happen inside the scheduler, there exists | |
719 | * cases that the tracing might happen before the need_resched | |
720 | * flag is checked. If this happens and the tracer calls | |
721 | * preempt_enable (after a disable), a schedule might take place | |
722 | * causing an infinite recursion. | |
723 | * | |
57794a9d | 724 | * To prevent this, we read the need_resched flag before |
8f0a056f SR |
725 | * disabling preemption. When we want to enable preemption we |
726 | * check the flag, if it is set, then we call preempt_enable_no_resched. | |
727 | * Otherwise, we call preempt_enable. | |
728 | * | |
57794a9d | 729 | * The rational for doing the above is that if need_resched is set |
8f0a056f SR |
730 | * and we have yet to reschedule, we are either in an atomic location |
731 | * (where we do not need to check for scheduling) or we are inside | |
732 | * the scheduler and do not want to resched. | |
733 | */ | |
734 | static inline int ftrace_preempt_disable(void) | |
735 | { | |
736 | int resched; | |
737 | ||
738 | resched = need_resched(); | |
739 | preempt_disable_notrace(); | |
740 | ||
741 | return resched; | |
742 | } | |
743 | ||
744 | /** | |
745 | * ftrace_preempt_enable - enable preemption scheduler safe | |
746 | * @resched: the return value from ftrace_preempt_disable | |
747 | * | |
748 | * This is a scheduler safe way to enable preemption and not miss | |
749 | * any preemption checks. The disabled saved the state of preemption. | |
57794a9d | 750 | * If resched is set, then we are either inside an atomic or |
8f0a056f SR |
751 | * are inside the scheduler (we would have already scheduled |
752 | * otherwise). In this case, we do not want to call normal | |
753 | * preempt_enable, but preempt_enable_no_resched instead. | |
754 | */ | |
755 | static inline void ftrace_preempt_enable(int resched) | |
756 | { | |
757 | if (resched) | |
758 | preempt_enable_no_resched_notrace(); | |
759 | else | |
760 | preempt_enable_notrace(); | |
761 | } | |
762 | ||
2ed84eeb | 763 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
764 | extern int enable_branch_tracing(struct trace_array *tr); |
765 | extern void disable_branch_tracing(void); | |
766 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 767 | { |
9f029e83 SR |
768 | if (trace_flags & TRACE_ITER_BRANCH) |
769 | return enable_branch_tracing(tr); | |
52f232cb SR |
770 | return 0; |
771 | } | |
9f029e83 | 772 | static inline void trace_branch_disable(void) |
52f232cb SR |
773 | { |
774 | /* due to races, always disable */ | |
9f029e83 | 775 | disable_branch_tracing(); |
52f232cb SR |
776 | } |
777 | #else | |
9f029e83 | 778 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
779 | { |
780 | return 0; | |
781 | } | |
9f029e83 | 782 | static inline void trace_branch_disable(void) |
52f232cb SR |
783 | { |
784 | } | |
2ed84eeb | 785 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 786 | |
1852fcce SR |
787 | /* set ring buffers to default size if not already done so */ |
788 | int tracing_update_buffers(void); | |
789 | ||
fd994989 SR |
790 | /* trace event type bit fields, not numeric */ |
791 | enum { | |
792 | TRACE_EVENT_TYPE_PRINTF = 1, | |
793 | TRACE_EVENT_TYPE_RAW = 2, | |
794 | }; | |
795 | ||
cf027f64 TZ |
796 | struct ftrace_event_field { |
797 | struct list_head link; | |
798 | char *name; | |
799 | char *type; | |
800 | int offset; | |
801 | int size; | |
802 | }; | |
803 | ||
c32e827b | 804 | struct ftrace_event_call { |
cf027f64 TZ |
805 | char *name; |
806 | char *system; | |
807 | struct dentry *dir; | |
808 | int enabled; | |
809 | int (*regfunc)(void); | |
810 | void (*unregfunc)(void); | |
811 | int id; | |
812 | int (*raw_init)(void); | |
813 | int (*show_format)(struct trace_seq *s); | |
814 | int (*define_fields)(void); | |
815 | struct list_head fields; | |
7ce7e424 | 816 | struct filter_pred **preds; |
ac199db0 PZ |
817 | |
818 | #ifdef CONFIG_EVENT_PROFILE | |
819 | atomic_t profile_count; | |
820 | int (*profile_enable)(struct ftrace_event_call *); | |
821 | void (*profile_disable)(struct ftrace_event_call *); | |
822 | #endif | |
c32e827b SR |
823 | }; |
824 | ||
cfb180f3 TZ |
825 | struct event_subsystem { |
826 | struct list_head list; | |
827 | const char *name; | |
828 | struct dentry *entry; | |
829 | struct filter_pred **preds; | |
830 | }; | |
831 | ||
832 | #define events_for_each(event) \ | |
833 | for (event = __start_ftrace_events; \ | |
834 | (unsigned long)event < (unsigned long)__stop_ftrace_events; \ | |
835 | event++) | |
836 | ||
7ce7e424 TZ |
837 | #define MAX_FILTER_PRED 8 |
838 | ||
839 | struct filter_pred; | |
840 | ||
841 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); | |
842 | ||
843 | struct filter_pred { | |
844 | filter_pred_fn_t fn; | |
845 | u64 val; | |
846 | char *str_val; | |
847 | int str_len; | |
848 | char *field_name; | |
849 | int offset; | |
850 | int not; | |
851 | int or; | |
852 | int compound; | |
853 | int clear; | |
854 | }; | |
855 | ||
cf027f64 TZ |
856 | int trace_define_field(struct ftrace_event_call *call, char *type, |
857 | char *name, int offset, int size); | |
7ce7e424 | 858 | extern void filter_free_pred(struct filter_pred *pred); |
4bda2d51 TZ |
859 | extern void filter_print_preds(struct filter_pred **preds, |
860 | struct trace_seq *s); | |
7ce7e424 TZ |
861 | extern int filter_parse(char **pbuf, struct filter_pred *pred); |
862 | extern int filter_add_pred(struct ftrace_event_call *call, | |
863 | struct filter_pred *pred); | |
864 | extern void filter_free_preds(struct ftrace_event_call *call); | |
865 | extern int filter_match_preds(struct ftrace_event_call *call, void *rec); | |
cfb180f3 TZ |
866 | extern void filter_free_subsystem_preds(struct event_subsystem *system); |
867 | extern int filter_add_subsystem_pred(struct event_subsystem *system, | |
868 | struct filter_pred *pred); | |
7ce7e424 | 869 | |
e1112b4d TZ |
870 | static inline void |
871 | filter_check_discard(struct ftrace_event_call *call, void *rec, | |
872 | struct ring_buffer_event *event) | |
873 | { | |
874 | if (unlikely(call->preds) && !filter_match_preds(call, rec)) | |
875 | ring_buffer_event_discard(event); | |
876 | } | |
877 | ||
878 | #define __common_field(type, item) \ | |
879 | ret = trace_define_field(event_call, #type, "common_" #item, \ | |
880 | offsetof(typeof(field.ent), item), \ | |
881 | sizeof(field.ent.item)); \ | |
882 | if (ret) \ | |
883 | return ret; | |
884 | ||
c32e827b SR |
885 | void event_trace_printk(unsigned long ip, const char *fmt, ...); |
886 | extern struct ftrace_event_call __start_ftrace_events[]; | |
887 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
888 | ||
ac199db0 PZ |
889 | #define for_each_event(event) \ |
890 | for (event = __start_ftrace_events; \ | |
891 | (unsigned long)event < (unsigned long)__stop_ftrace_events; \ | |
892 | event++) | |
893 | ||
e9fb2b6d SR |
894 | extern const char *__start___trace_bprintk_fmt[]; |
895 | extern const char *__stop___trace_bprintk_fmt[]; | |
896 | ||
bdc06758 SR |
897 | /* |
898 | * The double __builtin_constant_p is because gcc will give us an error | |
899 | * if we try to allocate the static variable to fmt if it is not a | |
900 | * constant. Even with the outer if statement optimizing out. | |
901 | */ | |
e9fb2b6d SR |
902 | #define event_trace_printk(ip, fmt, args...) \ |
903 | do { \ | |
904 | __trace_printk_check_format(fmt, ##args); \ | |
905 | tracing_record_cmdline(current); \ | |
906 | if (__builtin_constant_p(fmt)) { \ | |
907 | static const char *trace_printk_fmt \ | |
908 | __attribute__((section("__trace_printk_fmt"))) = \ | |
909 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
910 | \ | |
911 | __trace_bprintk(ip, trace_printk_fmt, ##args); \ | |
912 | } else \ | |
913 | __trace_printk(ip, fmt, ##args); \ | |
914 | } while (0) | |
915 | ||
e1112b4d TZ |
916 | #undef TRACE_EVENT_FORMAT |
917 | #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \ | |
918 | extern struct ftrace_event_call event_##call; | |
e45f2e2b TZ |
919 | #undef TRACE_EVENT_FORMAT_NOFILTER |
920 | #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt) | |
e1112b4d TZ |
921 | #include "trace_event_types.h" |
922 | ||
bc0c38d1 | 923 | #endif /* _LINUX_KERNEL_TRACE_H */ |