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1 | #ifndef _LINUX_KERNEL_TRACE_H |
2 | #define _LINUX_KERNEL_TRACE_H |
3 | |
4 | #include <linux/fs.h> |
5 | #include <linux/atomic.h> |
6 | #include <linux/sched.h> |
7 | #include <linux/clocksource.h> |
8 | #include <linux/ring_buffer.h> |
9 | #include <linux/mmiotrace.h> |
10 | #include <linux/tracepoint.h> |
11 | #include <linux/ftrace.h> |
12 | #include <linux/hw_breakpoint.h> |
13 | #include <linux/trace_seq.h> |
14 | #include <linux/ftrace_event.h> |
15 | |
16 | enum trace_type { |
17 | __TRACE_FIRST_TYPE = 0, |
18 | |
19 | TRACE_FN, |
20 | TRACE_CTX, |
21 | TRACE_WAKE, |
22 | TRACE_STACK, |
23 | TRACE_PRINT, |
24 | TRACE_BPRINT, |
25 | TRACE_MMIO_RW, |
26 | TRACE_MMIO_MAP, |
27 | TRACE_BRANCH, |
28 | TRACE_GRAPH_RET, |
29 | TRACE_GRAPH_ENT, |
30 | TRACE_USER_STACK, |
31 | TRACE_BLK, |
32 | |
33 | __TRACE_LAST_TYPE, |
34 | }; |
35 | |
36 | |
37 | #undef __field |
38 | #define __field(type, item) type item; |
39 | |
40 | #undef __field_struct |
41 | #define __field_struct(type, item) __field(type, item) |
42 | |
43 | #undef __field_desc |
44 | #define __field_desc(type, container, item) |
45 | |
46 | #undef __array |
47 | #define __array(type, item, size) type item[size]; |
48 | |
49 | #undef __array_desc |
50 | #define __array_desc(type, container, item, size) |
51 | |
52 | #undef __dynamic_array |
53 | #define __dynamic_array(type, item) type item[]; |
54 | |
55 | #undef F_STRUCT |
56 | #define F_STRUCT(args...) args |
57 | |
58 | #undef FTRACE_ENTRY |
59 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
60 | struct struct_name { \ |
61 | struct trace_entry ent; \ |
62 | tstruct \ |
63 | } |
64 | |
65 | #undef TP_ARGS |
66 | #define TP_ARGS(args...) args |
67 | |
68 | #undef FTRACE_ENTRY_DUP |
69 | #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) |
70 | |
71 | #undef FTRACE_ENTRY_REG |
72 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ |
73 | filter, regfn) \ |
74 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ |
75 | filter) |
76 | |
77 | #include "trace_entries.h" |
78 | |
79 | /* |
80 | * syscalls are special, and need special handling, this is why |
81 | * they are not included in trace_entries.h |
82 | */ |
83 | struct syscall_trace_enter { |
84 | struct trace_entry ent; |
85 | int nr; |
86 | unsigned long args[]; |
87 | }; |
88 | |
89 | struct syscall_trace_exit { |
90 | struct trace_entry ent; |
91 | int nr; |
92 | long ret; |
93 | }; |
94 | |
95 | struct kprobe_trace_entry_head { |
96 | struct trace_entry ent; |
97 | unsigned long ip; |
98 | }; |
99 | |
100 | struct kretprobe_trace_entry_head { |
101 | struct trace_entry ent; |
102 | unsigned long func; |
103 | unsigned long ret_ip; |
104 | }; |
105 | |
106 | struct uprobe_trace_entry_head { |
107 | struct trace_entry ent; |
108 | unsigned long ip; |
109 | }; |
110 | |
111 | /* |
112 | * trace_flag_type is an enumeration that holds different |
113 | * states when a trace occurs. These are: |
114 | * IRQS_OFF - interrupts were disabled |
115 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
116 | * NEED_RESCHED - reschedule is requested |
117 | * HARDIRQ - inside an interrupt handler |
118 | * SOFTIRQ - inside a softirq handler |
119 | */ |
120 | enum trace_flag_type { |
121 | TRACE_FLAG_IRQS_OFF = 0x01, |
122 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
123 | TRACE_FLAG_NEED_RESCHED = 0x04, |
124 | TRACE_FLAG_HARDIRQ = 0x08, |
125 | TRACE_FLAG_SOFTIRQ = 0x10, |
126 | }; |
127 | |
128 | #define TRACE_BUF_SIZE 1024 |
129 | |
130 | /* |
131 | * The CPU trace array - it consists of thousands of trace entries |
132 | * plus some other descriptor data: (for example which task started |
133 | * the trace, etc.) |
134 | */ |
135 | struct trace_array_cpu { |
136 | atomic_t disabled; |
137 | void *buffer_page; /* ring buffer spare */ |
138 | |
139 | unsigned long entries; |
140 | unsigned long saved_latency; |
141 | unsigned long critical_start; |
142 | unsigned long critical_end; |
143 | unsigned long critical_sequence; |
144 | unsigned long nice; |
145 | unsigned long policy; |
146 | unsigned long rt_priority; |
147 | unsigned long skipped_entries; |
148 | cycle_t preempt_timestamp; |
149 | pid_t pid; |
150 | uid_t uid; |
151 | char comm[TASK_COMM_LEN]; |
152 | }; |
153 | |
154 | /* |
155 | * The trace array - an array of per-CPU trace arrays. This is the |
156 | * highest level data structure that individual tracers deal with. |
157 | * They have on/off state as well: |
158 | */ |
159 | struct trace_array { |
160 | struct ring_buffer *buffer; |
161 | int cpu; |
162 | int buffer_disabled; |
163 | cycle_t time_start; |
164 | struct task_struct *waiter; |
165 | struct trace_array_cpu *data[NR_CPUS]; |
166 | }; |
167 | |
168 | #define FTRACE_CMP_TYPE(var, type) \ |
169 | __builtin_types_compatible_p(typeof(var), type *) |
170 | |
171 | #undef IF_ASSIGN |
172 | #define IF_ASSIGN(var, entry, etype, id) \ |
173 | if (FTRACE_CMP_TYPE(var, etype)) { \ |
174 | var = (typeof(var))(entry); \ |
175 | WARN_ON(id && (entry)->type != id); \ |
176 | break; \ |
177 | } |
178 | |
179 | /* Will cause compile errors if type is not found. */ |
180 | extern void __ftrace_bad_type(void); |
181 | |
182 | /* |
183 | * The trace_assign_type is a verifier that the entry type is |
184 | * the same as the type being assigned. To add new types simply |
185 | * add a line with the following format: |
186 | * |
187 | * IF_ASSIGN(var, ent, type, id); |
188 | * |
189 | * Where "type" is the trace type that includes the trace_entry |
190 | * as the "ent" item. And "id" is the trace identifier that is |
191 | * used in the trace_type enum. |
192 | * |
193 | * If the type can have more than one id, then use zero. |
194 | */ |
195 | #define trace_assign_type(var, ent) \ |
196 | do { \ |
197 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ |
198 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ |
199 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
200 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
201 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
202 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
203 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
204 | TRACE_MMIO_RW); \ |
205 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ |
206 | TRACE_MMIO_MAP); \ |
207 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
208 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
209 | TRACE_GRAPH_ENT); \ |
210 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ |
211 | TRACE_GRAPH_RET); \ |
212 | __ftrace_bad_type(); \ |
213 | } while (0) |
214 | |
215 | /* |
216 | * An option specific to a tracer. This is a boolean value. |
217 | * The bit is the bit index that sets its value on the |
218 | * flags value in struct tracer_flags. |
219 | */ |
220 | struct tracer_opt { |
221 | const char *name; /* Will appear on the trace_options file */ |
222 | u32 bit; /* Mask assigned in val field in tracer_flags */ |
223 | }; |
224 | |
225 | /* |
226 | * The set of specific options for a tracer. Your tracer |
227 | * have to set the initial value of the flags val. |
228 | */ |
229 | struct tracer_flags { |
230 | u32 val; |
231 | struct tracer_opt *opts; |
232 | }; |
233 | |
234 | /* Makes more easy to define a tracer opt */ |
235 | #define TRACER_OPT(s, b) .name = #s, .bit = b |
236 | |
237 | |
238 | /** |
239 | * struct tracer - a specific tracer and its callbacks to interact with debugfs |
240 | * @name: the name chosen to select it on the available_tracers file |
241 | * @init: called when one switches to this tracer (echo name > current_tracer) |
242 | * @reset: called when one switches to another tracer |
243 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled) |
244 | * @stop: called when tracing is paused (echo 0 > tracing_enabled) |
245 | * @open: called when the trace file is opened |
246 | * @pipe_open: called when the trace_pipe file is opened |
247 | * @wait_pipe: override how the user waits for traces on trace_pipe |
248 | * @close: called when the trace file is released |
249 | * @pipe_close: called when the trace_pipe file is released |
250 | * @read: override the default read callback on trace_pipe |
251 | * @splice_read: override the default splice_read callback on trace_pipe |
252 | * @selftest: selftest to run on boot (see trace_selftest.c) |
253 | * @print_headers: override the first lines that describe your columns |
254 | * @print_line: callback that prints a trace |
255 | * @set_flag: signals one of your private flags changed (trace_options file) |
256 | * @flags: your private flags |
257 | */ |
258 | struct tracer { |
259 | const char *name; |
260 | int (*init)(struct trace_array *tr); |
261 | void (*reset)(struct trace_array *tr); |
262 | void (*start)(struct trace_array *tr); |
263 | void (*stop)(struct trace_array *tr); |
264 | void (*open)(struct trace_iterator *iter); |
265 | void (*pipe_open)(struct trace_iterator *iter); |
266 | void (*wait_pipe)(struct trace_iterator *iter); |
267 | void (*close)(struct trace_iterator *iter); |
268 | void (*pipe_close)(struct trace_iterator *iter); |
269 | ssize_t (*read)(struct trace_iterator *iter, |
270 | struct file *filp, char __user *ubuf, |
271 | size_t cnt, loff_t *ppos); |
272 | ssize_t (*splice_read)(struct trace_iterator *iter, |
273 | struct file *filp, |
274 | loff_t *ppos, |
275 | struct pipe_inode_info *pipe, |
276 | size_t len, |
277 | unsigned int flags); |
278 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
279 | int (*selftest)(struct tracer *trace, |
280 | struct trace_array *tr); |
281 | #endif |
282 | void (*print_header)(struct seq_file *m); |
283 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
284 | /* If you handled the flag setting, return 0 */ |
285 | int (*set_flag)(u32 old_flags, u32 bit, int set); |
286 | struct tracer *next; |
287 | struct tracer_flags *flags; |
288 | int print_max; |
289 | int use_max_tr; |
290 | }; |
291 | |
292 | |
293 | /* Only current can touch trace_recursion */ |
294 | #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0) |
295 | #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0) |
296 | |
297 | /* Ring buffer has the 10 LSB bits to count */ |
298 | #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff) |
299 | |
300 | /* for function tracing recursion */ |
301 | #define TRACE_INTERNAL_BIT (1<<11) |
302 | #define TRACE_GLOBAL_BIT (1<<12) |
303 | #define TRACE_CONTROL_BIT (1<<13) |
304 | |
305 | /* |
306 | * Abuse of the trace_recursion. |
307 | * As we need a way to maintain state if we are tracing the function |
308 | * graph in irq because we want to trace a particular function that |
309 | * was called in irq context but we have irq tracing off. Since this |
310 | * can only be modified by current, we can reuse trace_recursion. |
311 | */ |
312 | #define TRACE_IRQ_BIT (1<<13) |
313 | |
314 | #define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0) |
315 | #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0) |
316 | #define trace_recursion_test(bit) ((current)->trace_recursion & (bit)) |
317 | |
318 | #define TRACE_PIPE_ALL_CPU -1 |
319 | |
320 | int tracer_init(struct tracer *t, struct trace_array *tr); |
321 | int tracing_is_enabled(void); |
322 | void trace_wake_up(void); |
323 | void tracing_reset(struct trace_array *tr, int cpu); |
324 | void tracing_reset_online_cpus(struct trace_array *tr); |
325 | void tracing_reset_current(int cpu); |
326 | void tracing_reset_current_online_cpus(void); |
327 | int tracing_open_generic(struct inode *inode, struct file *filp); |
328 | struct dentry *trace_create_file(const char *name, |
329 | umode_t mode, |
330 | struct dentry *parent, |
331 | void *data, |
332 | const struct file_operations *fops); |
333 | |
334 | struct dentry *tracing_init_dentry(void); |
335 | |
336 | struct ring_buffer_event; |
337 | |
338 | struct ring_buffer_event * |
339 | trace_buffer_lock_reserve(struct ring_buffer *buffer, |
340 | int type, |
341 | unsigned long len, |
342 | unsigned long flags, |
343 | int pc); |
344 | void trace_buffer_unlock_commit(struct ring_buffer *buffer, |
345 | struct ring_buffer_event *event, |
346 | unsigned long flags, int pc); |
347 | |
348 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
349 | struct trace_array_cpu *data); |
350 | |
351 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, |
352 | int *ent_cpu, u64 *ent_ts); |
353 | |
354 | int trace_empty(struct trace_iterator *iter); |
355 | |
356 | void *trace_find_next_entry_inc(struct trace_iterator *iter); |
357 | |
358 | void trace_init_global_iter(struct trace_iterator *iter); |
359 | |
360 | void tracing_iter_reset(struct trace_iterator *iter, int cpu); |
361 | |
362 | void default_wait_pipe(struct trace_iterator *iter); |
363 | void poll_wait_pipe(struct trace_iterator *iter); |
364 | |
365 | void ftrace(struct trace_array *tr, |
366 | struct trace_array_cpu *data, |
367 | unsigned long ip, |
368 | unsigned long parent_ip, |
369 | unsigned long flags, int pc); |
370 | void tracing_sched_switch_trace(struct trace_array *tr, |
371 | struct task_struct *prev, |
372 | struct task_struct *next, |
373 | unsigned long flags, int pc); |
374 | |
375 | void tracing_sched_wakeup_trace(struct trace_array *tr, |
376 | struct task_struct *wakee, |
377 | struct task_struct *cur, |
378 | unsigned long flags, int pc); |
379 | void trace_function(struct trace_array *tr, |
380 | unsigned long ip, |
381 | unsigned long parent_ip, |
382 | unsigned long flags, int pc); |
383 | void trace_graph_function(struct trace_array *tr, |
384 | unsigned long ip, |
385 | unsigned long parent_ip, |
386 | unsigned long flags, int pc); |
387 | void trace_latency_header(struct seq_file *m); |
388 | void trace_default_header(struct seq_file *m); |
389 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter); |
390 | int trace_empty(struct trace_iterator *iter); |
391 | |
392 | void trace_graph_return(struct ftrace_graph_ret *trace); |
393 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
394 | void set_graph_array(struct trace_array *tr); |
395 | |
396 | void tracing_start_cmdline_record(void); |
397 | void tracing_stop_cmdline_record(void); |
398 | void tracing_sched_switch_assign_trace(struct trace_array *tr); |
399 | void tracing_stop_sched_switch_record(void); |
400 | void tracing_start_sched_switch_record(void); |
401 | int register_tracer(struct tracer *type); |
402 | void unregister_tracer(struct tracer *type); |
403 | int is_tracing_stopped(void); |
404 | enum trace_file_type { |
405 | TRACE_FILE_LAT_FMT = 1, |
406 | TRACE_FILE_ANNOTATE = 2, |
407 | }; |
408 | |
409 | extern cpumask_var_t __read_mostly tracing_buffer_mask; |
410 | |
411 | #define for_each_tracing_cpu(cpu) \ |
412 | for_each_cpu(cpu, tracing_buffer_mask) |
413 | |
414 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); |
415 | |
416 | extern unsigned long tracing_thresh; |
417 | |
418 | #ifdef CONFIG_TRACER_MAX_TRACE |
419 | extern unsigned long tracing_max_latency; |
420 | |
421 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); |
422 | void update_max_tr_single(struct trace_array *tr, |
423 | struct task_struct *tsk, int cpu); |
424 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
425 | |
426 | #ifdef CONFIG_STACKTRACE |
427 | void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, |
428 | int skip, int pc); |
429 | |
430 | void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, |
431 | int skip, int pc, struct pt_regs *regs); |
432 | |
433 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
434 | int pc); |
435 | |
436 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, |
437 | int pc); |
438 | #else |
439 | static inline void ftrace_trace_stack(struct ring_buffer *buffer, |
440 | unsigned long flags, int skip, int pc) |
441 | { |
442 | } |
443 | |
444 | static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, |
445 | unsigned long flags, int skip, |
446 | int pc, struct pt_regs *regs) |
447 | { |
448 | } |
449 | |
450 | static inline void ftrace_trace_userstack(struct ring_buffer *buffer, |
451 | unsigned long flags, int pc) |
452 | { |
453 | } |
454 | |
455 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags, |
456 | int skip, int pc) |
457 | { |
458 | } |
459 | #endif /* CONFIG_STACKTRACE */ |
460 | |
461 | extern cycle_t ftrace_now(int cpu); |
462 | |
463 | extern void trace_find_cmdline(int pid, char comm[]); |
464 | |
465 | #ifdef CONFIG_DYNAMIC_FTRACE |
466 | extern unsigned long ftrace_update_tot_cnt; |
467 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
468 | extern int DYN_FTRACE_TEST_NAME(void); |
469 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 |
470 | extern int DYN_FTRACE_TEST_NAME2(void); |
471 | #endif |
472 | |
473 | extern int ring_buffer_expanded; |
474 | extern bool tracing_selftest_disabled; |
475 | DECLARE_PER_CPU(int, ftrace_cpu_disabled); |
476 | |
477 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
478 | extern int trace_selftest_startup_function(struct tracer *trace, |
479 | struct trace_array *tr); |
480 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
481 | struct trace_array *tr); |
482 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
483 | struct trace_array *tr); |
484 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
485 | struct trace_array *tr); |
486 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
487 | struct trace_array *tr); |
488 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
489 | struct trace_array *tr); |
490 | extern int trace_selftest_startup_nop(struct tracer *trace, |
491 | struct trace_array *tr); |
492 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
493 | struct trace_array *tr); |
494 | extern int trace_selftest_startup_branch(struct tracer *trace, |
495 | struct trace_array *tr); |
496 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
497 | |
498 | extern void *head_page(struct trace_array_cpu *data); |
499 | extern unsigned long long ns2usecs(cycle_t nsec); |
500 | extern int |
501 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
502 | extern int |
503 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
504 | extern int |
505 | trace_array_vprintk(struct trace_array *tr, |
506 | unsigned long ip, const char *fmt, va_list args); |
507 | int trace_array_printk(struct trace_array *tr, |
508 | unsigned long ip, const char *fmt, ...); |
509 | void trace_printk_seq(struct trace_seq *s); |
510 | enum print_line_t print_trace_line(struct trace_iterator *iter); |
511 | |
512 | extern unsigned long trace_flags; |
513 | |
514 | extern int trace_clock_id; |
515 | |
516 | /* Standard output formatting function used for function return traces */ |
517 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
518 | |
519 | /* Flag options */ |
520 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1 |
521 | #define TRACE_GRAPH_PRINT_CPU 0x2 |
522 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 |
523 | #define TRACE_GRAPH_PRINT_PROC 0x8 |
524 | #define TRACE_GRAPH_PRINT_DURATION 0x10 |
525 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 |
526 | |
527 | extern enum print_line_t |
528 | print_graph_function_flags(struct trace_iterator *iter, u32 flags); |
529 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags); |
530 | extern enum print_line_t |
531 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); |
532 | extern void graph_trace_open(struct trace_iterator *iter); |
533 | extern void graph_trace_close(struct trace_iterator *iter); |
534 | extern int __trace_graph_entry(struct trace_array *tr, |
535 | struct ftrace_graph_ent *trace, |
536 | unsigned long flags, int pc); |
537 | extern void __trace_graph_return(struct trace_array *tr, |
538 | struct ftrace_graph_ret *trace, |
539 | unsigned long flags, int pc); |
540 | |
541 | |
542 | #ifdef CONFIG_DYNAMIC_FTRACE |
543 | /* TODO: make this variable */ |
544 | #define FTRACE_GRAPH_MAX_FUNCS 32 |
545 | extern int ftrace_graph_filter_enabled; |
546 | extern int ftrace_graph_count; |
547 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; |
548 | |
549 | static inline int ftrace_graph_addr(unsigned long addr) |
550 | { |
551 | int i; |
552 | |
553 | if (!ftrace_graph_filter_enabled) |
554 | return 1; |
555 | |
556 | for (i = 0; i < ftrace_graph_count; i++) { |
557 | if (addr == ftrace_graph_funcs[i]) { |
558 | /* |
559 | * If no irqs are to be traced, but a set_graph_function |
560 | * is set, and called by an interrupt handler, we still |
561 | * want to trace it. |
562 | */ |
563 | if (in_irq()) |
564 | trace_recursion_set(TRACE_IRQ_BIT); |
565 | else |
566 | trace_recursion_clear(TRACE_IRQ_BIT); |
567 | return 1; |
568 | } |
569 | } |
570 | |
571 | return 0; |
572 | } |
573 | #else |
574 | static inline int ftrace_graph_addr(unsigned long addr) |
575 | { |
576 | return 1; |
577 | } |
578 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
579 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
580 | static inline enum print_line_t |
581 | print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
582 | { |
583 | return TRACE_TYPE_UNHANDLED; |
584 | } |
585 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
586 | |
587 | extern struct list_head ftrace_pids; |
588 | |
589 | #ifdef CONFIG_FUNCTION_TRACER |
590 | static inline int ftrace_trace_task(struct task_struct *task) |
591 | { |
592 | if (list_empty(&ftrace_pids)) |
593 | return 1; |
594 | |
595 | return test_tsk_trace_trace(task); |
596 | } |
597 | extern int ftrace_is_dead(void); |
598 | #else |
599 | static inline int ftrace_trace_task(struct task_struct *task) |
600 | { |
601 | return 1; |
602 | } |
603 | static inline int ftrace_is_dead(void) { return 0; } |
604 | #endif |
605 | |
606 | int ftrace_event_is_function(struct ftrace_event_call *call); |
607 | |
608 | /* |
609 | * struct trace_parser - servers for reading the user input separated by spaces |
610 | * @cont: set if the input is not complete - no final space char was found |
611 | * @buffer: holds the parsed user input |
612 | * @idx: user input length |
613 | * @size: buffer size |
614 | */ |
615 | struct trace_parser { |
616 | bool cont; |
617 | char *buffer; |
618 | unsigned idx; |
619 | unsigned size; |
620 | }; |
621 | |
622 | static inline bool trace_parser_loaded(struct trace_parser *parser) |
623 | { |
624 | return (parser->idx != 0); |
625 | } |
626 | |
627 | static inline bool trace_parser_cont(struct trace_parser *parser) |
628 | { |
629 | return parser->cont; |
630 | } |
631 | |
632 | static inline void trace_parser_clear(struct trace_parser *parser) |
633 | { |
634 | parser->cont = false; |
635 | parser->idx = 0; |
636 | } |
637 | |
638 | extern int trace_parser_get_init(struct trace_parser *parser, int size); |
639 | extern void trace_parser_put(struct trace_parser *parser); |
640 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, |
641 | size_t cnt, loff_t *ppos); |
642 | |
643 | /* |
644 | * trace_iterator_flags is an enumeration that defines bit |
645 | * positions into trace_flags that controls the output. |
646 | * |
647 | * NOTE: These bits must match the trace_options array in |
648 | * trace.c. |
649 | */ |
650 | enum trace_iterator_flags { |
651 | TRACE_ITER_PRINT_PARENT = 0x01, |
652 | TRACE_ITER_SYM_OFFSET = 0x02, |
653 | TRACE_ITER_SYM_ADDR = 0x04, |
654 | TRACE_ITER_VERBOSE = 0x08, |
655 | TRACE_ITER_RAW = 0x10, |
656 | TRACE_ITER_HEX = 0x20, |
657 | TRACE_ITER_BIN = 0x40, |
658 | TRACE_ITER_BLOCK = 0x80, |
659 | TRACE_ITER_STACKTRACE = 0x100, |
660 | TRACE_ITER_PRINTK = 0x200, |
661 | TRACE_ITER_PREEMPTONLY = 0x400, |
662 | TRACE_ITER_BRANCH = 0x800, |
663 | TRACE_ITER_ANNOTATE = 0x1000, |
664 | TRACE_ITER_USERSTACKTRACE = 0x2000, |
665 | TRACE_ITER_SYM_USEROBJ = 0x4000, |
666 | TRACE_ITER_PRINTK_MSGONLY = 0x8000, |
667 | TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ |
668 | TRACE_ITER_LATENCY_FMT = 0x20000, |
669 | TRACE_ITER_SLEEP_TIME = 0x40000, |
670 | TRACE_ITER_GRAPH_TIME = 0x80000, |
671 | TRACE_ITER_RECORD_CMD = 0x100000, |
672 | TRACE_ITER_OVERWRITE = 0x200000, |
673 | TRACE_ITER_STOP_ON_FREE = 0x400000, |
674 | TRACE_ITER_IRQ_INFO = 0x800000, |
675 | }; |
676 | |
677 | /* |
678 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that |
679 | * control the output of kernel symbols. |
680 | */ |
681 | #define TRACE_ITER_SYM_MASK \ |
682 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
683 | |
684 | extern struct tracer nop_trace; |
685 | |
686 | #ifdef CONFIG_BRANCH_TRACER |
687 | extern int enable_branch_tracing(struct trace_array *tr); |
688 | extern void disable_branch_tracing(void); |
689 | static inline int trace_branch_enable(struct trace_array *tr) |
690 | { |
691 | if (trace_flags & TRACE_ITER_BRANCH) |
692 | return enable_branch_tracing(tr); |
693 | return 0; |
694 | } |
695 | static inline void trace_branch_disable(void) |
696 | { |
697 | /* due to races, always disable */ |
698 | disable_branch_tracing(); |
699 | } |
700 | #else |
701 | static inline int trace_branch_enable(struct trace_array *tr) |
702 | { |
703 | return 0; |
704 | } |
705 | static inline void trace_branch_disable(void) |
706 | { |
707 | } |
708 | #endif /* CONFIG_BRANCH_TRACER */ |
709 | |
710 | /* set ring buffers to default size if not already done so */ |
711 | int tracing_update_buffers(void); |
712 | |
713 | /* trace event type bit fields, not numeric */ |
714 | enum { |
715 | TRACE_EVENT_TYPE_PRINTF = 1, |
716 | TRACE_EVENT_TYPE_RAW = 2, |
717 | }; |
718 | |
719 | struct ftrace_event_field { |
720 | struct list_head link; |
721 | char *name; |
722 | char *type; |
723 | int filter_type; |
724 | int offset; |
725 | int size; |
726 | int is_signed; |
727 | }; |
728 | |
729 | struct event_filter { |
730 | int n_preds; /* Number assigned */ |
731 | int a_preds; /* allocated */ |
732 | struct filter_pred *preds; |
733 | struct filter_pred *root; |
734 | char *filter_string; |
735 | }; |
736 | |
737 | struct event_subsystem { |
738 | struct list_head list; |
739 | const char *name; |
740 | struct dentry *entry; |
741 | struct event_filter *filter; |
742 | int nr_events; |
743 | int ref_count; |
744 | }; |
745 | |
746 | #define FILTER_PRED_INVALID ((unsigned short)-1) |
747 | #define FILTER_PRED_IS_RIGHT (1 << 15) |
748 | #define FILTER_PRED_FOLD (1 << 15) |
749 | |
750 | /* |
751 | * The max preds is the size of unsigned short with |
752 | * two flags at the MSBs. One bit is used for both the IS_RIGHT |
753 | * and FOLD flags. The other is reserved. |
754 | * |
755 | * 2^14 preds is way more than enough. |
756 | */ |
757 | #define MAX_FILTER_PRED 16384 |
758 | |
759 | struct filter_pred; |
760 | struct regex; |
761 | |
762 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); |
763 | |
764 | typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
765 | |
766 | enum regex_type { |
767 | MATCH_FULL = 0, |
768 | MATCH_FRONT_ONLY, |
769 | MATCH_MIDDLE_ONLY, |
770 | MATCH_END_ONLY, |
771 | }; |
772 | |
773 | struct regex { |
774 | char pattern[MAX_FILTER_STR_VAL]; |
775 | int len; |
776 | int field_len; |
777 | regex_match_func match; |
778 | }; |
779 | |
780 | struct filter_pred { |
781 | filter_pred_fn_t fn; |
782 | u64 val; |
783 | struct regex regex; |
784 | unsigned short *ops; |
785 | struct ftrace_event_field *field; |
786 | int offset; |
787 | int not; |
788 | int op; |
789 | unsigned short index; |
790 | unsigned short parent; |
791 | unsigned short left; |
792 | unsigned short right; |
793 | }; |
794 | |
795 | extern struct list_head ftrace_common_fields; |
796 | |
797 | extern enum regex_type |
798 | filter_parse_regex(char *buff, int len, char **search, int *not); |
799 | extern void print_event_filter(struct ftrace_event_call *call, |
800 | struct trace_seq *s); |
801 | extern int apply_event_filter(struct ftrace_event_call *call, |
802 | char *filter_string); |
803 | extern int apply_subsystem_event_filter(struct event_subsystem *system, |
804 | char *filter_string); |
805 | extern void print_subsystem_event_filter(struct event_subsystem *system, |
806 | struct trace_seq *s); |
807 | extern int filter_assign_type(const char *type); |
808 | |
809 | struct list_head * |
810 | trace_get_fields(struct ftrace_event_call *event_call); |
811 | |
812 | static inline int |
813 | filter_check_discard(struct ftrace_event_call *call, void *rec, |
814 | struct ring_buffer *buffer, |
815 | struct ring_buffer_event *event) |
816 | { |
817 | if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && |
818 | !filter_match_preds(call->filter, rec)) { |
819 | ring_buffer_discard_commit(buffer, event); |
820 | return 1; |
821 | } |
822 | |
823 | return 0; |
824 | } |
825 | |
826 | extern void trace_event_enable_cmd_record(bool enable); |
827 | |
828 | extern struct mutex event_mutex; |
829 | extern struct list_head ftrace_events; |
830 | |
831 | extern const char *__start___trace_bprintk_fmt[]; |
832 | extern const char *__stop___trace_bprintk_fmt[]; |
833 | |
834 | void trace_printk_init_buffers(void); |
835 | |
836 | #undef FTRACE_ENTRY |
837 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ |
838 | extern struct ftrace_event_call \ |
839 | __attribute__((__aligned__(4))) event_##call; |
840 | #undef FTRACE_ENTRY_DUP |
841 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ |
842 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ |
843 | filter) |
844 | #include "trace_entries.h" |
845 | |
846 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) |
847 | int perf_ftrace_event_register(struct ftrace_event_call *call, |
848 | enum trace_reg type, void *data); |
849 | #else |
850 | #define perf_ftrace_event_register NULL |
851 | #endif |
852 | |
853 | #endif /* _LINUX_KERNEL_TRACE_H */ |
854 |
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