1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef _LINUX_KERNEL_TRACE_H
4 #define _LINUX_KERNEL_TRACE_H
5
6 #include <linux/fs.h>
7 #include <linux/atomic.h>
8 #include <linux/sched.h>
9 #include <linux/clocksource.h>
10 #include <linux/ring_buffer.h>
11 #include <linux/mmiotrace.h>
12 #include <linux/tracepoint.h>
13 #include <linux/ftrace.h>
14 #include <linux/hw_breakpoint.h>
15 #include <linux/trace_seq.h>
16 #include <linux/trace_events.h>
17 #include <linux/compiler.h>
18 #include <linux/trace_seq.h>
19 #include <linux/glob.h>
20
21 #ifdef CONFIG_FTRACE_SYSCALLS
22 #include <asm/unistd.h> /* For NR_SYSCALLS */
23 #include <asm/syscall.h> /* some archs define it here */
24 #endif
25
26 enum trace_type {
27 __TRACE_FIRST_TYPE = 0,
28
29 TRACE_FN,
30 TRACE_CTX,
31 TRACE_WAKE,
32 TRACE_STACK,
33 TRACE_PRINT,
34 TRACE_BPRINT,
35 TRACE_MMIO_RW,
36 TRACE_MMIO_MAP,
37 TRACE_BRANCH,
38 TRACE_GRAPH_RET,
39 TRACE_GRAPH_ENT,
40 TRACE_USER_STACK,
41 TRACE_BLK,
42 TRACE_BPUTS,
43 TRACE_HWLAT,
44 TRACE_RAW_DATA,
45
46 __TRACE_LAST_TYPE,
47 };
48
49
50 #undef __field
51 #define __field(type, item) type item;
52
53 #undef __field_struct
54 #define __field_struct(type, item) __field(type, item)
55
56 #undef __field_desc
57 #define __field_desc(type, container, item)
58
59 #undef __array
60 #define __array(type, item, size) type item[size];
61
62 #undef __array_desc
63 #define __array_desc(type, container, item, size)
64
65 #undef __dynamic_array
66 #define __dynamic_array(type, item) type item[];
67
68 #undef F_STRUCT
69 #define F_STRUCT(args...) args
70
71 #undef FTRACE_ENTRY
72 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
73 struct struct_name { \
74 struct trace_entry ent; \
75 tstruct \
76 }
77
78 #undef FTRACE_ENTRY_DUP
79 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
80
81 #undef FTRACE_ENTRY_REG
82 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
83 filter, regfn) \
84 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
85 filter)
86
87 #undef FTRACE_ENTRY_PACKED
88 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \
89 filter) \
90 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
91 filter) __packed
92
93 #include "trace_entries.h"
94
95 /*
96 * syscalls are special, and need special handling, this is why
97 * they are not included in trace_entries.h
98 */
99 struct syscall_trace_enter {
100 struct trace_entry ent;
101 int nr;
102 unsigned long args[];
103 };
104
105 struct syscall_trace_exit {
106 struct trace_entry ent;
107 int nr;
108 long ret;
109 };
110
111 struct kprobe_trace_entry_head {
112 struct trace_entry ent;
113 unsigned long ip;
114 };
115
116 struct kretprobe_trace_entry_head {
117 struct trace_entry ent;
118 unsigned long func;
119 unsigned long ret_ip;
120 };
121
122 /*
123 * trace_flag_type is an enumeration that holds different
124 * states when a trace occurs. These are:
125 * IRQS_OFF - interrupts were disabled
126 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
127 * NEED_RESCHED - reschedule is requested
128 * HARDIRQ - inside an interrupt handler
129 * SOFTIRQ - inside a softirq handler
130 */
131 enum trace_flag_type {
132 TRACE_FLAG_IRQS_OFF = 0x01,
133 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
134 TRACE_FLAG_NEED_RESCHED = 0x04,
135 TRACE_FLAG_HARDIRQ = 0x08,
136 TRACE_FLAG_SOFTIRQ = 0x10,
137 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
138 TRACE_FLAG_NMI = 0x40,
139 };
140
141 #define TRACE_BUF_SIZE 1024
142
143 struct trace_array;
144
145 /*
146 * The CPU trace array - it consists of thousands of trace entries
147 * plus some other descriptor data: (for example which task started
148 * the trace, etc.)
149 */
150 struct trace_array_cpu {
151 atomic_t disabled;
152 void *buffer_page; /* ring buffer spare */
153
154 unsigned long entries;
155 unsigned long saved_latency;
156 unsigned long critical_start;
157 unsigned long critical_end;
158 unsigned long critical_sequence;
159 unsigned long nice;
160 unsigned long policy;
161 unsigned long rt_priority;
162 unsigned long skipped_entries;
163 u64 preempt_timestamp;
164 pid_t pid;
165 kuid_t uid;
166 char comm[TASK_COMM_LEN];
167
168 bool ignore_pid;
169 #ifdef CONFIG_FUNCTION_TRACER
170 bool ftrace_ignore_pid;
171 #endif
172 };
173
174 struct tracer;
175 struct trace_option_dentry;
176
177 struct trace_buffer {
178 struct trace_array *tr;
179 struct ring_buffer *buffer;
180 struct trace_array_cpu __percpu *data;
181 u64 time_start;
182 int cpu;
183 };
184
185 #define TRACE_FLAGS_MAX_SIZE 32
186
187 struct trace_options {
188 struct tracer *tracer;
189 struct trace_option_dentry *topts;
190 };
191
192 struct trace_pid_list {
193 int pid_max;
194 unsigned long *pids;
195 };
196
197 /*
198 * The trace array - an array of per-CPU trace arrays. This is the
199 * highest level data structure that individual tracers deal with.
200 * They have on/off state as well:
201 */
202 struct trace_array {
203 struct list_head list;
204 char *name;
205 struct trace_buffer trace_buffer;
206 #ifdef CONFIG_TRACER_MAX_TRACE
207 /*
208 * The max_buffer is used to snapshot the trace when a maximum
209 * latency is reached, or when the user initiates a snapshot.
210 * Some tracers will use this to store a maximum trace while
211 * it continues examining live traces.
212 *
213 * The buffers for the max_buffer are set up the same as the trace_buffer
214 * When a snapshot is taken, the buffer of the max_buffer is swapped
215 * with the buffer of the trace_buffer and the buffers are reset for
216 * the trace_buffer so the tracing can continue.
217 */
218 struct trace_buffer max_buffer;
219 bool allocated_snapshot;
220 #endif
221 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
222 unsigned long max_latency;
223 #endif
224 struct trace_pid_list __rcu *filtered_pids;
225 /*
226 * max_lock is used to protect the swapping of buffers
227 * when taking a max snapshot. The buffers themselves are
228 * protected by per_cpu spinlocks. But the action of the swap
229 * needs its own lock.
230 *
231 * This is defined as a arch_spinlock_t in order to help
232 * with performance when lockdep debugging is enabled.
233 *
234 * It is also used in other places outside the update_max_tr
235 * so it needs to be defined outside of the
236 * CONFIG_TRACER_MAX_TRACE.
237 */
238 arch_spinlock_t max_lock;
239 int buffer_disabled;
240 #ifdef CONFIG_FTRACE_SYSCALLS
241 int sys_refcount_enter;
242 int sys_refcount_exit;
243 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
244 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
245 #endif
246 int stop_count;
247 int clock_id;
248 int nr_topts;
249 bool clear_trace;
250 struct tracer *current_trace;
251 unsigned int trace_flags;
252 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
253 unsigned int flags;
254 raw_spinlock_t start_lock;
255 struct dentry *dir;
256 struct dentry *options;
257 struct dentry *percpu_dir;
258 struct dentry *event_dir;
259 struct trace_options *topts;
260 struct list_head systems;
261 struct list_head events;
262 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
263 int ref;
264 #ifdef CONFIG_FUNCTION_TRACER
265 struct ftrace_ops *ops;
266 struct trace_pid_list __rcu *function_pids;
267 #ifdef CONFIG_DYNAMIC_FTRACE
268 /* All of these are protected by the ftrace_lock */
269 struct list_head func_probes;
270 struct list_head mod_trace;
271 struct list_head mod_notrace;
272 #endif
273 /* function tracing enabled */
274 int function_enabled;
275 #endif
276 };
277
278 enum {
279 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
280 };
281
282 extern struct list_head ftrace_trace_arrays;
283
284 extern struct mutex trace_types_lock;
285
286 extern int trace_array_get(struct trace_array *tr);
287 extern void trace_array_put(struct trace_array *tr);
288
289 /*
290 * The global tracer (top) should be the first trace array added,
291 * but we check the flag anyway.
292 */
top_trace_array(void)293 static inline struct trace_array *top_trace_array(void)
294 {
295 struct trace_array *tr;
296
297 if (list_empty(&ftrace_trace_arrays))
298 return NULL;
299
300 tr = list_entry(ftrace_trace_arrays.prev,
301 typeof(*tr), list);
302 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
303 return tr;
304 }
305
306 #define FTRACE_CMP_TYPE(var, type) \
307 __builtin_types_compatible_p(typeof(var), type *)
308
309 #undef IF_ASSIGN
310 #define IF_ASSIGN(var, entry, etype, id) \
311 if (FTRACE_CMP_TYPE(var, etype)) { \
312 var = (typeof(var))(entry); \
313 WARN_ON(id && (entry)->type != id); \
314 break; \
315 }
316
317 /* Will cause compile errors if type is not found. */
318 extern void __ftrace_bad_type(void);
319
320 /*
321 * The trace_assign_type is a verifier that the entry type is
322 * the same as the type being assigned. To add new types simply
323 * add a line with the following format:
324 *
325 * IF_ASSIGN(var, ent, type, id);
326 *
327 * Where "type" is the trace type that includes the trace_entry
328 * as the "ent" item. And "id" is the trace identifier that is
329 * used in the trace_type enum.
330 *
331 * If the type can have more than one id, then use zero.
332 */
333 #define trace_assign_type(var, ent) \
334 do { \
335 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
336 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
337 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
338 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
339 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
340 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
341 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
342 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
343 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
344 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
345 TRACE_MMIO_RW); \
346 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
347 TRACE_MMIO_MAP); \
348 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
349 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
350 TRACE_GRAPH_ENT); \
351 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
352 TRACE_GRAPH_RET); \
353 __ftrace_bad_type(); \
354 } while (0)
355
356 /*
357 * An option specific to a tracer. This is a boolean value.
358 * The bit is the bit index that sets its value on the
359 * flags value in struct tracer_flags.
360 */
361 struct tracer_opt {
362 const char *name; /* Will appear on the trace_options file */
363 u32 bit; /* Mask assigned in val field in tracer_flags */
364 };
365
366 /*
367 * The set of specific options for a tracer. Your tracer
368 * have to set the initial value of the flags val.
369 */
370 struct tracer_flags {
371 u32 val;
372 struct tracer_opt *opts;
373 struct tracer *trace;
374 };
375
376 /* Makes more easy to define a tracer opt */
377 #define TRACER_OPT(s, b) .name = #s, .bit = b
378
379
380 struct trace_option_dentry {
381 struct tracer_opt *opt;
382 struct tracer_flags *flags;
383 struct trace_array *tr;
384 struct dentry *entry;
385 };
386
387 /**
388 * struct tracer - a specific tracer and its callbacks to interact with tracefs
389 * @name: the name chosen to select it on the available_tracers file
390 * @init: called when one switches to this tracer (echo name > current_tracer)
391 * @reset: called when one switches to another tracer
392 * @start: called when tracing is unpaused (echo 1 > tracing_on)
393 * @stop: called when tracing is paused (echo 0 > tracing_on)
394 * @update_thresh: called when tracing_thresh is updated
395 * @open: called when the trace file is opened
396 * @pipe_open: called when the trace_pipe file is opened
397 * @close: called when the trace file is released
398 * @pipe_close: called when the trace_pipe file is released
399 * @read: override the default read callback on trace_pipe
400 * @splice_read: override the default splice_read callback on trace_pipe
401 * @selftest: selftest to run on boot (see trace_selftest.c)
402 * @print_headers: override the first lines that describe your columns
403 * @print_line: callback that prints a trace
404 * @set_flag: signals one of your private flags changed (trace_options file)
405 * @flags: your private flags
406 */
407 struct tracer {
408 const char *name;
409 int (*init)(struct trace_array *tr);
410 void (*reset)(struct trace_array *tr);
411 void (*start)(struct trace_array *tr);
412 void (*stop)(struct trace_array *tr);
413 int (*update_thresh)(struct trace_array *tr);
414 void (*open)(struct trace_iterator *iter);
415 void (*pipe_open)(struct trace_iterator *iter);
416 void (*close)(struct trace_iterator *iter);
417 void (*pipe_close)(struct trace_iterator *iter);
418 ssize_t (*read)(struct trace_iterator *iter,
419 struct file *filp, char __user *ubuf,
420 size_t cnt, loff_t *ppos);
421 ssize_t (*splice_read)(struct trace_iterator *iter,
422 struct file *filp,
423 loff_t *ppos,
424 struct pipe_inode_info *pipe,
425 size_t len,
426 unsigned int flags);
427 #ifdef CONFIG_FTRACE_STARTUP_TEST
428 int (*selftest)(struct tracer *trace,
429 struct trace_array *tr);
430 #endif
431 void (*print_header)(struct seq_file *m);
432 enum print_line_t (*print_line)(struct trace_iterator *iter);
433 /* If you handled the flag setting, return 0 */
434 int (*set_flag)(struct trace_array *tr,
435 u32 old_flags, u32 bit, int set);
436 /* Return 0 if OK with change, else return non-zero */
437 int (*flag_changed)(struct trace_array *tr,
438 u32 mask, int set);
439 struct tracer *next;
440 struct tracer_flags *flags;
441 int enabled;
442 int ref;
443 bool print_max;
444 bool allow_instances;
445 #ifdef CONFIG_TRACER_MAX_TRACE
446 bool use_max_tr;
447 #endif
448 /* True if tracer cannot be enabled in kernel param */
449 bool noboot;
450 };
451
452
453 /* Only current can touch trace_recursion */
454
455 /*
456 * For function tracing recursion:
457 * The order of these bits are important.
458 *
459 * When function tracing occurs, the following steps are made:
460 * If arch does not support a ftrace feature:
461 * call internal function (uses INTERNAL bits) which calls...
462 * If callback is registered to the "global" list, the list
463 * function is called and recursion checks the GLOBAL bits.
464 * then this function calls...
465 * The function callback, which can use the FTRACE bits to
466 * check for recursion.
467 *
468 * Now if the arch does not suppport a feature, and it calls
469 * the global list function which calls the ftrace callback
470 * all three of these steps will do a recursion protection.
471 * There's no reason to do one if the previous caller already
472 * did. The recursion that we are protecting against will
473 * go through the same steps again.
474 *
475 * To prevent the multiple recursion checks, if a recursion
476 * bit is set that is higher than the MAX bit of the current
477 * check, then we know that the check was made by the previous
478 * caller, and we can skip the current check.
479 */
480 enum {
481 TRACE_BUFFER_BIT,
482 TRACE_BUFFER_NMI_BIT,
483 TRACE_BUFFER_IRQ_BIT,
484 TRACE_BUFFER_SIRQ_BIT,
485
486 /* Start of function recursion bits */
487 TRACE_FTRACE_BIT,
488 TRACE_FTRACE_NMI_BIT,
489 TRACE_FTRACE_IRQ_BIT,
490 TRACE_FTRACE_SIRQ_BIT,
491
492 /* INTERNAL_BITs must be greater than FTRACE_BITs */
493 TRACE_INTERNAL_BIT,
494 TRACE_INTERNAL_NMI_BIT,
495 TRACE_INTERNAL_IRQ_BIT,
496 TRACE_INTERNAL_SIRQ_BIT,
497
498 TRACE_BRANCH_BIT,
499 /*
500 * Abuse of the trace_recursion.
501 * As we need a way to maintain state if we are tracing the function
502 * graph in irq because we want to trace a particular function that
503 * was called in irq context but we have irq tracing off. Since this
504 * can only be modified by current, we can reuse trace_recursion.
505 */
506 TRACE_IRQ_BIT,
507
508 /* Set if the function is in the set_graph_function file */
509 TRACE_GRAPH_BIT,
510
511 /*
512 * In the very unlikely case that an interrupt came in
513 * at a start of graph tracing, and we want to trace
514 * the function in that interrupt, the depth can be greater
515 * than zero, because of the preempted start of a previous
516 * trace. In an even more unlikely case, depth could be 2
517 * if a softirq interrupted the start of graph tracing,
518 * followed by an interrupt preempting a start of graph
519 * tracing in the softirq, and depth can even be 3
520 * if an NMI came in at the start of an interrupt function
521 * that preempted a softirq start of a function that
522 * preempted normal context!!!! Luckily, it can't be
523 * greater than 3, so the next two bits are a mask
524 * of what the depth is when we set TRACE_GRAPH_BIT
525 */
526
527 TRACE_GRAPH_DEPTH_START_BIT,
528 TRACE_GRAPH_DEPTH_END_BIT,
529 };
530
531 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
532 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
533 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
534
535 #define trace_recursion_depth() \
536 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3)
537 #define trace_recursion_set_depth(depth) \
538 do { \
539 current->trace_recursion &= \
540 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \
541 current->trace_recursion |= \
542 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \
543 } while (0)
544
545 #define TRACE_CONTEXT_BITS 4
546
547 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
548 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
549
550 #define TRACE_LIST_START TRACE_INTERNAL_BIT
551 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
552
553 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
554
trace_get_context_bit(void)555 static __always_inline int trace_get_context_bit(void)
556 {
557 int bit;
558
559 if (in_interrupt()) {
560 if (in_nmi())
561 bit = 0;
562
563 else if (in_irq())
564 bit = 1;
565 else
566 bit = 2;
567 } else
568 bit = 3;
569
570 return bit;
571 }
572
trace_test_and_set_recursion(int start,int max)573 static __always_inline int trace_test_and_set_recursion(int start, int max)
574 {
575 unsigned int val = current->trace_recursion;
576 int bit;
577
578 /* A previous recursion check was made */
579 if ((val & TRACE_CONTEXT_MASK) > max)
580 return 0;
581
582 bit = trace_get_context_bit() + start;
583 if (unlikely(val & (1 << bit)))
584 return -1;
585
586 val |= 1 << bit;
587 current->trace_recursion = val;
588 barrier();
589
590 return bit;
591 }
592
trace_clear_recursion(int bit)593 static __always_inline void trace_clear_recursion(int bit)
594 {
595 unsigned int val = current->trace_recursion;
596
597 if (!bit)
598 return;
599
600 bit = 1 << bit;
601 val &= ~bit;
602
603 barrier();
604 current->trace_recursion = val;
605 }
606
607 static inline struct ring_buffer_iter *
trace_buffer_iter(struct trace_iterator * iter,int cpu)608 trace_buffer_iter(struct trace_iterator *iter, int cpu)
609 {
610 if (iter->buffer_iter && iter->buffer_iter[cpu])
611 return iter->buffer_iter[cpu];
612 return NULL;
613 }
614
615 int tracer_init(struct tracer *t, struct trace_array *tr);
616 int tracing_is_enabled(void);
617 void tracing_reset(struct trace_buffer *buf, int cpu);
618 void tracing_reset_online_cpus(struct trace_buffer *buf);
619 void tracing_reset_current(int cpu);
620 void tracing_reset_all_online_cpus(void);
621 int tracing_open_generic(struct inode *inode, struct file *filp);
622 bool tracing_is_disabled(void);
623 int tracer_tracing_is_on(struct trace_array *tr);
624 void tracer_tracing_on(struct trace_array *tr);
625 void tracer_tracing_off(struct trace_array *tr);
626 struct dentry *trace_create_file(const char *name,
627 umode_t mode,
628 struct dentry *parent,
629 void *data,
630 const struct file_operations *fops);
631
632 struct dentry *tracing_init_dentry(void);
633
634 struct ring_buffer_event;
635
636 struct ring_buffer_event *
637 trace_buffer_lock_reserve(struct ring_buffer *buffer,
638 int type,
639 unsigned long len,
640 unsigned long flags,
641 int pc);
642
643 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
644 struct trace_array_cpu *data);
645
646 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
647 int *ent_cpu, u64 *ent_ts);
648
649 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer,
650 struct ring_buffer_event *event);
651
652 int trace_empty(struct trace_iterator *iter);
653
654 void *trace_find_next_entry_inc(struct trace_iterator *iter);
655
656 void trace_init_global_iter(struct trace_iterator *iter);
657
658 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
659
660 void trace_function(struct trace_array *tr,
661 unsigned long ip,
662 unsigned long parent_ip,
663 unsigned long flags, int pc);
664 void trace_graph_function(struct trace_array *tr,
665 unsigned long ip,
666 unsigned long parent_ip,
667 unsigned long flags, int pc);
668 void trace_latency_header(struct seq_file *m);
669 void trace_default_header(struct seq_file *m);
670 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
671 int trace_empty(struct trace_iterator *iter);
672
673 void trace_graph_return(struct ftrace_graph_ret *trace);
674 int trace_graph_entry(struct ftrace_graph_ent *trace);
675 void set_graph_array(struct trace_array *tr);
676
677 void tracing_start_cmdline_record(void);
678 void tracing_stop_cmdline_record(void);
679 void tracing_start_tgid_record(void);
680 void tracing_stop_tgid_record(void);
681
682 int register_tracer(struct tracer *type);
683 int is_tracing_stopped(void);
684
685 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
686
687 extern cpumask_var_t __read_mostly tracing_buffer_mask;
688
689 #define for_each_tracing_cpu(cpu) \
690 for_each_cpu(cpu, tracing_buffer_mask)
691
692 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
693
694 extern unsigned long tracing_thresh;
695
696 /* PID filtering */
697
698 extern int pid_max;
699
700 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
701 pid_t search_pid);
702 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
703 struct task_struct *task);
704 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
705 struct task_struct *self,
706 struct task_struct *task);
707 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
708 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
709 int trace_pid_show(struct seq_file *m, void *v);
710 void trace_free_pid_list(struct trace_pid_list *pid_list);
711 int trace_pid_write(struct trace_pid_list *filtered_pids,
712 struct trace_pid_list **new_pid_list,
713 const char __user *ubuf, size_t cnt);
714
715 #ifdef CONFIG_TRACER_MAX_TRACE
716 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
717 void update_max_tr_single(struct trace_array *tr,
718 struct task_struct *tsk, int cpu);
719 #endif /* CONFIG_TRACER_MAX_TRACE */
720
721 #ifdef CONFIG_STACKTRACE
722 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
723 int pc);
724
725 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
726 int pc);
727 #else
ftrace_trace_userstack(struct ring_buffer * buffer,unsigned long flags,int pc)728 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
729 unsigned long flags, int pc)
730 {
731 }
732
__trace_stack(struct trace_array * tr,unsigned long flags,int skip,int pc)733 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
734 int skip, int pc)
735 {
736 }
737 #endif /* CONFIG_STACKTRACE */
738
739 extern u64 ftrace_now(int cpu);
740
741 extern void trace_find_cmdline(int pid, char comm[]);
742 extern int trace_find_tgid(int pid);
743 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
744
745 #ifdef CONFIG_DYNAMIC_FTRACE
746 extern unsigned long ftrace_update_tot_cnt;
747 void ftrace_init_trace_array(struct trace_array *tr);
748 #else
ftrace_init_trace_array(struct trace_array * tr)749 static inline void ftrace_init_trace_array(struct trace_array *tr) { }
750 #endif
751 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
752 extern int DYN_FTRACE_TEST_NAME(void);
753 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
754 extern int DYN_FTRACE_TEST_NAME2(void);
755
756 extern bool ring_buffer_expanded;
757 extern bool tracing_selftest_disabled;
758
759 #ifdef CONFIG_FTRACE_STARTUP_TEST
760 extern int trace_selftest_startup_function(struct tracer *trace,
761 struct trace_array *tr);
762 extern int trace_selftest_startup_function_graph(struct tracer *trace,
763 struct trace_array *tr);
764 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
765 struct trace_array *tr);
766 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
767 struct trace_array *tr);
768 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
769 struct trace_array *tr);
770 extern int trace_selftest_startup_wakeup(struct tracer *trace,
771 struct trace_array *tr);
772 extern int trace_selftest_startup_nop(struct tracer *trace,
773 struct trace_array *tr);
774 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
775 struct trace_array *tr);
776 extern int trace_selftest_startup_branch(struct tracer *trace,
777 struct trace_array *tr);
778 /*
779 * Tracer data references selftest functions that only occur
780 * on boot up. These can be __init functions. Thus, when selftests
781 * are enabled, then the tracers need to reference __init functions.
782 */
783 #define __tracer_data __refdata
784 #else
785 /* Tracers are seldom changed. Optimize when selftests are disabled. */
786 #define __tracer_data __read_mostly
787 #endif /* CONFIG_FTRACE_STARTUP_TEST */
788
789 extern void *head_page(struct trace_array_cpu *data);
790 extern unsigned long long ns2usecs(u64 nsec);
791 extern int
792 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
793 extern int
794 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
795 extern int
796 trace_array_vprintk(struct trace_array *tr,
797 unsigned long ip, const char *fmt, va_list args);
798 int trace_array_printk(struct trace_array *tr,
799 unsigned long ip, const char *fmt, ...);
800 int trace_array_printk_buf(struct ring_buffer *buffer,
801 unsigned long ip, const char *fmt, ...);
802 void trace_printk_seq(struct trace_seq *s);
803 enum print_line_t print_trace_line(struct trace_iterator *iter);
804
805 extern char trace_find_mark(unsigned long long duration);
806
807 struct ftrace_hash;
808
809 struct ftrace_mod_load {
810 struct list_head list;
811 char *func;
812 char *module;
813 int enable;
814 };
815
816 enum {
817 FTRACE_HASH_FL_MOD = (1 << 0),
818 };
819
820 struct ftrace_hash {
821 unsigned long size_bits;
822 struct hlist_head *buckets;
823 unsigned long count;
824 unsigned long flags;
825 struct rcu_head rcu;
826 };
827
828 struct ftrace_func_entry *
829 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
830
ftrace_hash_empty(struct ftrace_hash * hash)831 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
832 {
833 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
834 }
835
836 /* Standard output formatting function used for function return traces */
837 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
838
839 /* Flag options */
840 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
841 #define TRACE_GRAPH_PRINT_CPU 0x2
842 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
843 #define TRACE_GRAPH_PRINT_PROC 0x8
844 #define TRACE_GRAPH_PRINT_DURATION 0x10
845 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
846 #define TRACE_GRAPH_PRINT_IRQS 0x40
847 #define TRACE_GRAPH_PRINT_TAIL 0x80
848 #define TRACE_GRAPH_SLEEP_TIME 0x100
849 #define TRACE_GRAPH_GRAPH_TIME 0x200
850 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
851 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
852
853 extern void ftrace_graph_sleep_time_control(bool enable);
854 extern void ftrace_graph_graph_time_control(bool enable);
855
856 extern enum print_line_t
857 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
858 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
859 extern void
860 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
861 extern void graph_trace_open(struct trace_iterator *iter);
862 extern void graph_trace_close(struct trace_iterator *iter);
863 extern int __trace_graph_entry(struct trace_array *tr,
864 struct ftrace_graph_ent *trace,
865 unsigned long flags, int pc);
866 extern void __trace_graph_return(struct trace_array *tr,
867 struct ftrace_graph_ret *trace,
868 unsigned long flags, int pc);
869
870 #ifdef CONFIG_DYNAMIC_FTRACE
871 extern struct ftrace_hash __rcu *ftrace_graph_hash;
872 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
873
ftrace_graph_addr(struct ftrace_graph_ent * trace)874 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
875 {
876 unsigned long addr = trace->func;
877 int ret = 0;
878 struct ftrace_hash *hash;
879
880 preempt_disable_notrace();
881
882 /*
883 * Have to open code "rcu_dereference_sched()" because the
884 * function graph tracer can be called when RCU is not
885 * "watching".
886 * Protected with schedule_on_each_cpu(ftrace_sync)
887 */
888 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
889
890 if (ftrace_hash_empty(hash)) {
891 ret = 1;
892 goto out;
893 }
894
895 if (ftrace_lookup_ip(hash, addr)) {
896
897 /*
898 * This needs to be cleared on the return functions
899 * when the depth is zero.
900 */
901 trace_recursion_set(TRACE_GRAPH_BIT);
902 trace_recursion_set_depth(trace->depth);
903
904 /*
905 * If no irqs are to be traced, but a set_graph_function
906 * is set, and called by an interrupt handler, we still
907 * want to trace it.
908 */
909 if (in_irq())
910 trace_recursion_set(TRACE_IRQ_BIT);
911 else
912 trace_recursion_clear(TRACE_IRQ_BIT);
913 ret = 1;
914 }
915
916 out:
917 preempt_enable_notrace();
918 return ret;
919 }
920
ftrace_graph_addr_finish(struct ftrace_graph_ret * trace)921 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
922 {
923 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
924 trace->depth == trace_recursion_depth())
925 trace_recursion_clear(TRACE_GRAPH_BIT);
926 }
927
ftrace_graph_notrace_addr(unsigned long addr)928 static inline int ftrace_graph_notrace_addr(unsigned long addr)
929 {
930 int ret = 0;
931 struct ftrace_hash *notrace_hash;
932
933 preempt_disable_notrace();
934
935 /*
936 * Have to open code "rcu_dereference_sched()" because the
937 * function graph tracer can be called when RCU is not
938 * "watching".
939 * Protected with schedule_on_each_cpu(ftrace_sync)
940 */
941 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
942 !preemptible());
943
944 if (ftrace_lookup_ip(notrace_hash, addr))
945 ret = 1;
946
947 preempt_enable_notrace();
948 return ret;
949 }
950 #else
ftrace_graph_addr(struct ftrace_graph_ent * trace)951 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
952 {
953 return 1;
954 }
955
ftrace_graph_notrace_addr(unsigned long addr)956 static inline int ftrace_graph_notrace_addr(unsigned long addr)
957 {
958 return 0;
959 }
ftrace_graph_addr_finish(struct ftrace_graph_ret * trace)960 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
961 { }
962 #endif /* CONFIG_DYNAMIC_FTRACE */
963
964 extern unsigned int fgraph_max_depth;
965
ftrace_graph_ignore_func(struct ftrace_graph_ent * trace)966 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
967 {
968 /* trace it when it is-nested-in or is a function enabled. */
969 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
970 ftrace_graph_addr(trace)) ||
971 (trace->depth < 0) ||
972 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
973 }
974
975 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
976 static inline enum print_line_t
print_graph_function_flags(struct trace_iterator * iter,u32 flags)977 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
978 {
979 return TRACE_TYPE_UNHANDLED;
980 }
981 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
982
983 extern struct list_head ftrace_pids;
984
985 #ifdef CONFIG_FUNCTION_TRACER
986 struct ftrace_func_command {
987 struct list_head list;
988 char *name;
989 int (*func)(struct trace_array *tr,
990 struct ftrace_hash *hash,
991 char *func, char *cmd,
992 char *params, int enable);
993 };
994 extern bool ftrace_filter_param __initdata;
ftrace_trace_task(struct trace_array * tr)995 static inline int ftrace_trace_task(struct trace_array *tr)
996 {
997 return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid);
998 }
999 extern int ftrace_is_dead(void);
1000 int ftrace_create_function_files(struct trace_array *tr,
1001 struct dentry *parent);
1002 void ftrace_destroy_function_files(struct trace_array *tr);
1003 void ftrace_init_global_array_ops(struct trace_array *tr);
1004 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
1005 void ftrace_reset_array_ops(struct trace_array *tr);
1006 int using_ftrace_ops_list_func(void);
1007 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
1008 void ftrace_init_tracefs_toplevel(struct trace_array *tr,
1009 struct dentry *d_tracer);
1010 void ftrace_clear_pids(struct trace_array *tr);
1011 int init_function_trace(void);
1012 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
1013 #else
ftrace_trace_task(struct trace_array * tr)1014 static inline int ftrace_trace_task(struct trace_array *tr)
1015 {
1016 return 1;
1017 }
ftrace_is_dead(void)1018 static inline int ftrace_is_dead(void) { return 0; }
1019 static inline int
ftrace_create_function_files(struct trace_array * tr,struct dentry * parent)1020 ftrace_create_function_files(struct trace_array *tr,
1021 struct dentry *parent)
1022 {
1023 return 0;
1024 }
ftrace_destroy_function_files(struct trace_array * tr)1025 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1026 static inline __init void
ftrace_init_global_array_ops(struct trace_array * tr)1027 ftrace_init_global_array_ops(struct trace_array *tr) { }
ftrace_reset_array_ops(struct trace_array * tr)1028 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
ftrace_init_tracefs(struct trace_array * tr,struct dentry * d)1029 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
ftrace_init_tracefs_toplevel(struct trace_array * tr,struct dentry * d)1030 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
ftrace_clear_pids(struct trace_array * tr)1031 static inline void ftrace_clear_pids(struct trace_array *tr) { }
init_function_trace(void)1032 static inline int init_function_trace(void) { return 0; }
ftrace_pid_follow_fork(struct trace_array * tr,bool enable)1033 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1034 /* ftace_func_t type is not defined, use macro instead of static inline */
1035 #define ftrace_init_array_ops(tr, func) do { } while (0)
1036 #endif /* CONFIG_FUNCTION_TRACER */
1037
1038 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1039
1040 struct ftrace_probe_ops {
1041 void (*func)(unsigned long ip,
1042 unsigned long parent_ip,
1043 struct trace_array *tr,
1044 struct ftrace_probe_ops *ops,
1045 void *data);
1046 int (*init)(struct ftrace_probe_ops *ops,
1047 struct trace_array *tr,
1048 unsigned long ip, void *init_data,
1049 void **data);
1050 void (*free)(struct ftrace_probe_ops *ops,
1051 struct trace_array *tr,
1052 unsigned long ip, void *data);
1053 int (*print)(struct seq_file *m,
1054 unsigned long ip,
1055 struct ftrace_probe_ops *ops,
1056 void *data);
1057 };
1058
1059 struct ftrace_func_mapper;
1060 typedef int (*ftrace_mapper_func)(void *data);
1061
1062 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1063 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1064 unsigned long ip);
1065 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1066 unsigned long ip, void *data);
1067 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1068 unsigned long ip);
1069 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1070 ftrace_mapper_func free_func);
1071
1072 extern int
1073 register_ftrace_function_probe(char *glob, struct trace_array *tr,
1074 struct ftrace_probe_ops *ops, void *data);
1075 extern int
1076 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1077 struct ftrace_probe_ops *ops);
1078 extern void clear_ftrace_function_probes(struct trace_array *tr);
1079
1080 int register_ftrace_command(struct ftrace_func_command *cmd);
1081 int unregister_ftrace_command(struct ftrace_func_command *cmd);
1082
1083 void ftrace_create_filter_files(struct ftrace_ops *ops,
1084 struct dentry *parent);
1085 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1086 #else
1087 struct ftrace_func_command;
1088
register_ftrace_command(struct ftrace_func_command * cmd)1089 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1090 {
1091 return -EINVAL;
1092 }
unregister_ftrace_command(char * cmd_name)1093 static inline __init int unregister_ftrace_command(char *cmd_name)
1094 {
1095 return -EINVAL;
1096 }
clear_ftrace_function_probes(struct trace_array * tr)1097 static inline void clear_ftrace_function_probes(struct trace_array *tr)
1098 {
1099 }
1100
1101 /*
1102 * The ops parameter passed in is usually undefined.
1103 * This must be a macro.
1104 */
1105 #define ftrace_create_filter_files(ops, parent) do { } while (0)
1106 #define ftrace_destroy_filter_files(ops) do { } while (0)
1107 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1108
1109 bool ftrace_event_is_function(struct trace_event_call *call);
1110
1111 /*
1112 * struct trace_parser - servers for reading the user input separated by spaces
1113 * @cont: set if the input is not complete - no final space char was found
1114 * @buffer: holds the parsed user input
1115 * @idx: user input length
1116 * @size: buffer size
1117 */
1118 struct trace_parser {
1119 bool cont;
1120 char *buffer;
1121 unsigned idx;
1122 unsigned size;
1123 };
1124
trace_parser_loaded(struct trace_parser * parser)1125 static inline bool trace_parser_loaded(struct trace_parser *parser)
1126 {
1127 return (parser->idx != 0);
1128 }
1129
trace_parser_cont(struct trace_parser * parser)1130 static inline bool trace_parser_cont(struct trace_parser *parser)
1131 {
1132 return parser->cont;
1133 }
1134
trace_parser_clear(struct trace_parser * parser)1135 static inline void trace_parser_clear(struct trace_parser *parser)
1136 {
1137 parser->cont = false;
1138 parser->idx = 0;
1139 }
1140
1141 extern int trace_parser_get_init(struct trace_parser *parser, int size);
1142 extern void trace_parser_put(struct trace_parser *parser);
1143 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1144 size_t cnt, loff_t *ppos);
1145
1146 /*
1147 * Only create function graph options if function graph is configured.
1148 */
1149 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1150 # define FGRAPH_FLAGS \
1151 C(DISPLAY_GRAPH, "display-graph"),
1152 #else
1153 # define FGRAPH_FLAGS
1154 #endif
1155
1156 #ifdef CONFIG_BRANCH_TRACER
1157 # define BRANCH_FLAGS \
1158 C(BRANCH, "branch"),
1159 #else
1160 # define BRANCH_FLAGS
1161 #endif
1162
1163 #ifdef CONFIG_FUNCTION_TRACER
1164 # define FUNCTION_FLAGS \
1165 C(FUNCTION, "function-trace"), \
1166 C(FUNC_FORK, "function-fork"),
1167 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1168 #else
1169 # define FUNCTION_FLAGS
1170 # define FUNCTION_DEFAULT_FLAGS 0UL
1171 # define TRACE_ITER_FUNC_FORK 0UL
1172 #endif
1173
1174 #ifdef CONFIG_STACKTRACE
1175 # define STACK_FLAGS \
1176 C(STACKTRACE, "stacktrace"),
1177 #else
1178 # define STACK_FLAGS
1179 #endif
1180
1181 /*
1182 * trace_iterator_flags is an enumeration that defines bit
1183 * positions into trace_flags that controls the output.
1184 *
1185 * NOTE: These bits must match the trace_options array in
1186 * trace.c (this macro guarantees it).
1187 */
1188 #define TRACE_FLAGS \
1189 C(PRINT_PARENT, "print-parent"), \
1190 C(SYM_OFFSET, "sym-offset"), \
1191 C(SYM_ADDR, "sym-addr"), \
1192 C(VERBOSE, "verbose"), \
1193 C(RAW, "raw"), \
1194 C(HEX, "hex"), \
1195 C(BIN, "bin"), \
1196 C(BLOCK, "block"), \
1197 C(PRINTK, "trace_printk"), \
1198 C(ANNOTATE, "annotate"), \
1199 C(USERSTACKTRACE, "userstacktrace"), \
1200 C(SYM_USEROBJ, "sym-userobj"), \
1201 C(PRINTK_MSGONLY, "printk-msg-only"), \
1202 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1203 C(LATENCY_FMT, "latency-format"), \
1204 C(RECORD_CMD, "record-cmd"), \
1205 C(RECORD_TGID, "record-tgid"), \
1206 C(OVERWRITE, "overwrite"), \
1207 C(STOP_ON_FREE, "disable_on_free"), \
1208 C(IRQ_INFO, "irq-info"), \
1209 C(MARKERS, "markers"), \
1210 C(EVENT_FORK, "event-fork"), \
1211 FUNCTION_FLAGS \
1212 FGRAPH_FLAGS \
1213 STACK_FLAGS \
1214 BRANCH_FLAGS
1215
1216 /*
1217 * By defining C, we can make TRACE_FLAGS a list of bit names
1218 * that will define the bits for the flag masks.
1219 */
1220 #undef C
1221 #define C(a, b) TRACE_ITER_##a##_BIT
1222
1223 enum trace_iterator_bits {
1224 TRACE_FLAGS
1225 /* Make sure we don't go more than we have bits for */
1226 TRACE_ITER_LAST_BIT
1227 };
1228
1229 /*
1230 * By redefining C, we can make TRACE_FLAGS a list of masks that
1231 * use the bits as defined above.
1232 */
1233 #undef C
1234 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1235
1236 enum trace_iterator_flags { TRACE_FLAGS };
1237
1238 /*
1239 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1240 * control the output of kernel symbols.
1241 */
1242 #define TRACE_ITER_SYM_MASK \
1243 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1244
1245 extern struct tracer nop_trace;
1246
1247 #ifdef CONFIG_BRANCH_TRACER
1248 extern int enable_branch_tracing(struct trace_array *tr);
1249 extern void disable_branch_tracing(void);
trace_branch_enable(struct trace_array * tr)1250 static inline int trace_branch_enable(struct trace_array *tr)
1251 {
1252 if (tr->trace_flags & TRACE_ITER_BRANCH)
1253 return enable_branch_tracing(tr);
1254 return 0;
1255 }
trace_branch_disable(void)1256 static inline void trace_branch_disable(void)
1257 {
1258 /* due to races, always disable */
1259 disable_branch_tracing();
1260 }
1261 #else
trace_branch_enable(struct trace_array * tr)1262 static inline int trace_branch_enable(struct trace_array *tr)
1263 {
1264 return 0;
1265 }
trace_branch_disable(void)1266 static inline void trace_branch_disable(void)
1267 {
1268 }
1269 #endif /* CONFIG_BRANCH_TRACER */
1270
1271 /* set ring buffers to default size if not already done so */
1272 int tracing_update_buffers(void);
1273
1274 struct ftrace_event_field {
1275 struct list_head link;
1276 const char *name;
1277 const char *type;
1278 int filter_type;
1279 int offset;
1280 int size;
1281 int is_signed;
1282 };
1283
1284 struct event_filter {
1285 int n_preds; /* Number assigned */
1286 int a_preds; /* allocated */
1287 struct filter_pred __rcu *preds;
1288 struct filter_pred __rcu *root;
1289 char *filter_string;
1290 };
1291
1292 struct event_subsystem {
1293 struct list_head list;
1294 const char *name;
1295 struct event_filter *filter;
1296 int ref_count;
1297 };
1298
1299 struct trace_subsystem_dir {
1300 struct list_head list;
1301 struct event_subsystem *subsystem;
1302 struct trace_array *tr;
1303 struct dentry *entry;
1304 int ref_count;
1305 int nr_events;
1306 };
1307
1308 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1309 struct ring_buffer *buffer,
1310 struct ring_buffer_event *event);
1311
1312 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1313 struct ring_buffer *buffer,
1314 struct ring_buffer_event *event,
1315 unsigned long flags, int pc,
1316 struct pt_regs *regs);
1317
trace_buffer_unlock_commit(struct trace_array * tr,struct ring_buffer * buffer,struct ring_buffer_event * event,unsigned long flags,int pc)1318 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1319 struct ring_buffer *buffer,
1320 struct ring_buffer_event *event,
1321 unsigned long flags, int pc)
1322 {
1323 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
1324 }
1325
1326 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1327 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1328 void trace_buffered_event_disable(void);
1329 void trace_buffered_event_enable(void);
1330
1331 static inline void
__trace_event_discard_commit(struct ring_buffer * buffer,struct ring_buffer_event * event)1332 __trace_event_discard_commit(struct ring_buffer *buffer,
1333 struct ring_buffer_event *event)
1334 {
1335 if (this_cpu_read(trace_buffered_event) == event) {
1336 /* Simply release the temp buffer */
1337 this_cpu_dec(trace_buffered_event_cnt);
1338 return;
1339 }
1340 ring_buffer_discard_commit(buffer, event);
1341 }
1342
1343 /*
1344 * Helper function for event_trigger_unlock_commit{_regs}().
1345 * If there are event triggers attached to this event that requires
1346 * filtering against its fields, then they wil be called as the
1347 * entry already holds the field information of the current event.
1348 *
1349 * It also checks if the event should be discarded or not.
1350 * It is to be discarded if the event is soft disabled and the
1351 * event was only recorded to process triggers, or if the event
1352 * filter is active and this event did not match the filters.
1353 *
1354 * Returns true if the event is discarded, false otherwise.
1355 */
1356 static inline bool
__event_trigger_test_discard(struct trace_event_file * file,struct ring_buffer * buffer,struct ring_buffer_event * event,void * entry,enum event_trigger_type * tt)1357 __event_trigger_test_discard(struct trace_event_file *file,
1358 struct ring_buffer *buffer,
1359 struct ring_buffer_event *event,
1360 void *entry,
1361 enum event_trigger_type *tt)
1362 {
1363 unsigned long eflags = file->flags;
1364
1365 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1366 *tt = event_triggers_call(file, entry);
1367
1368 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1369 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1370 !filter_match_preds(file->filter, entry))) {
1371 __trace_event_discard_commit(buffer, event);
1372 return true;
1373 }
1374
1375 return false;
1376 }
1377
1378 /**
1379 * event_trigger_unlock_commit - handle triggers and finish event commit
1380 * @file: The file pointer assoctiated to the event
1381 * @buffer: The ring buffer that the event is being written to
1382 * @event: The event meta data in the ring buffer
1383 * @entry: The event itself
1384 * @irq_flags: The state of the interrupts at the start of the event
1385 * @pc: The state of the preempt count at the start of the event.
1386 *
1387 * This is a helper function to handle triggers that require data
1388 * from the event itself. It also tests the event against filters and
1389 * if the event is soft disabled and should be discarded.
1390 */
1391 static inline void
event_trigger_unlock_commit(struct trace_event_file * file,struct ring_buffer * buffer,struct ring_buffer_event * event,void * entry,unsigned long irq_flags,int pc)1392 event_trigger_unlock_commit(struct trace_event_file *file,
1393 struct ring_buffer *buffer,
1394 struct ring_buffer_event *event,
1395 void *entry, unsigned long irq_flags, int pc)
1396 {
1397 enum event_trigger_type tt = ETT_NONE;
1398
1399 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1400 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
1401
1402 if (tt)
1403 event_triggers_post_call(file, tt, entry);
1404 }
1405
1406 /**
1407 * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1408 * @file: The file pointer assoctiated to the event
1409 * @buffer: The ring buffer that the event is being written to
1410 * @event: The event meta data in the ring buffer
1411 * @entry: The event itself
1412 * @irq_flags: The state of the interrupts at the start of the event
1413 * @pc: The state of the preempt count at the start of the event.
1414 *
1415 * This is a helper function to handle triggers that require data
1416 * from the event itself. It also tests the event against filters and
1417 * if the event is soft disabled and should be discarded.
1418 *
1419 * Same as event_trigger_unlock_commit() but calls
1420 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1421 */
1422 static inline void
event_trigger_unlock_commit_regs(struct trace_event_file * file,struct ring_buffer * buffer,struct ring_buffer_event * event,void * entry,unsigned long irq_flags,int pc,struct pt_regs * regs)1423 event_trigger_unlock_commit_regs(struct trace_event_file *file,
1424 struct ring_buffer *buffer,
1425 struct ring_buffer_event *event,
1426 void *entry, unsigned long irq_flags, int pc,
1427 struct pt_regs *regs)
1428 {
1429 enum event_trigger_type tt = ETT_NONE;
1430
1431 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1432 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1433 irq_flags, pc, regs);
1434
1435 if (tt)
1436 event_triggers_post_call(file, tt, entry);
1437 }
1438
1439 #define FILTER_PRED_INVALID ((unsigned short)-1)
1440 #define FILTER_PRED_IS_RIGHT (1 << 15)
1441 #define FILTER_PRED_FOLD (1 << 15)
1442
1443 /*
1444 * The max preds is the size of unsigned short with
1445 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1446 * and FOLD flags. The other is reserved.
1447 *
1448 * 2^14 preds is way more than enough.
1449 */
1450 #define MAX_FILTER_PRED 16384
1451
1452 struct filter_pred;
1453 struct regex;
1454
1455 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1456
1457 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1458
1459 enum regex_type {
1460 MATCH_FULL = 0,
1461 MATCH_FRONT_ONLY,
1462 MATCH_MIDDLE_ONLY,
1463 MATCH_END_ONLY,
1464 MATCH_GLOB,
1465 };
1466
1467 struct regex {
1468 char pattern[MAX_FILTER_STR_VAL];
1469 int len;
1470 int field_len;
1471 regex_match_func match;
1472 };
1473
1474 struct filter_pred {
1475 filter_pred_fn_t fn;
1476 u64 val;
1477 struct regex regex;
1478 unsigned short *ops;
1479 struct ftrace_event_field *field;
1480 int offset;
1481 int not;
1482 int op;
1483 unsigned short index;
1484 unsigned short parent;
1485 unsigned short left;
1486 unsigned short right;
1487 };
1488
is_string_field(struct ftrace_event_field * field)1489 static inline bool is_string_field(struct ftrace_event_field *field)
1490 {
1491 return field->filter_type == FILTER_DYN_STRING ||
1492 field->filter_type == FILTER_STATIC_STRING ||
1493 field->filter_type == FILTER_PTR_STRING ||
1494 field->filter_type == FILTER_COMM;
1495 }
1496
is_function_field(struct ftrace_event_field * field)1497 static inline bool is_function_field(struct ftrace_event_field *field)
1498 {
1499 return field->filter_type == FILTER_TRACE_FN;
1500 }
1501
1502 extern enum regex_type
1503 filter_parse_regex(char *buff, int len, char **search, int *not);
1504 extern void print_event_filter(struct trace_event_file *file,
1505 struct trace_seq *s);
1506 extern int apply_event_filter(struct trace_event_file *file,
1507 char *filter_string);
1508 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1509 char *filter_string);
1510 extern void print_subsystem_event_filter(struct event_subsystem *system,
1511 struct trace_seq *s);
1512 extern int filter_assign_type(const char *type);
1513 extern int create_event_filter(struct trace_event_call *call,
1514 char *filter_str, bool set_str,
1515 struct event_filter **filterp);
1516 extern void free_event_filter(struct event_filter *filter);
1517
1518 struct ftrace_event_field *
1519 trace_find_event_field(struct trace_event_call *call, char *name);
1520
1521 extern void trace_event_enable_cmd_record(bool enable);
1522 extern void trace_event_enable_tgid_record(bool enable);
1523
1524 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1525 extern int event_trace_del_tracer(struct trace_array *tr);
1526
1527 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1528 const char *system,
1529 const char *event);
1530
event_file_data(struct file * filp)1531 static inline void *event_file_data(struct file *filp)
1532 {
1533 return ACCESS_ONCE(file_inode(filp)->i_private);
1534 }
1535
1536 extern struct mutex event_mutex;
1537 extern struct list_head ftrace_events;
1538
1539 extern const struct file_operations event_trigger_fops;
1540 extern const struct file_operations event_hist_fops;
1541
1542 #ifdef CONFIG_HIST_TRIGGERS
1543 extern int register_trigger_hist_cmd(void);
1544 extern int register_trigger_hist_enable_disable_cmds(void);
1545 #else
register_trigger_hist_cmd(void)1546 static inline int register_trigger_hist_cmd(void) { return 0; }
register_trigger_hist_enable_disable_cmds(void)1547 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1548 #endif
1549
1550 extern int register_trigger_cmds(void);
1551 extern void clear_event_triggers(struct trace_array *tr);
1552
1553 struct event_trigger_data {
1554 unsigned long count;
1555 int ref;
1556 struct event_trigger_ops *ops;
1557 struct event_command *cmd_ops;
1558 struct event_filter __rcu *filter;
1559 char *filter_str;
1560 void *private_data;
1561 bool paused;
1562 bool paused_tmp;
1563 struct list_head list;
1564 char *name;
1565 struct list_head named_list;
1566 struct event_trigger_data *named_data;
1567 };
1568
1569 /* Avoid typos */
1570 #define ENABLE_EVENT_STR "enable_event"
1571 #define DISABLE_EVENT_STR "disable_event"
1572 #define ENABLE_HIST_STR "enable_hist"
1573 #define DISABLE_HIST_STR "disable_hist"
1574
1575 struct enable_trigger_data {
1576 struct trace_event_file *file;
1577 bool enable;
1578 bool hist;
1579 };
1580
1581 extern int event_enable_trigger_print(struct seq_file *m,
1582 struct event_trigger_ops *ops,
1583 struct event_trigger_data *data);
1584 extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1585 struct event_trigger_data *data);
1586 extern int event_enable_trigger_func(struct event_command *cmd_ops,
1587 struct trace_event_file *file,
1588 char *glob, char *cmd, char *param);
1589 extern int event_enable_register_trigger(char *glob,
1590 struct event_trigger_ops *ops,
1591 struct event_trigger_data *data,
1592 struct trace_event_file *file);
1593 extern void event_enable_unregister_trigger(char *glob,
1594 struct event_trigger_ops *ops,
1595 struct event_trigger_data *test,
1596 struct trace_event_file *file);
1597 extern void trigger_data_free(struct event_trigger_data *data);
1598 extern int event_trigger_init(struct event_trigger_ops *ops,
1599 struct event_trigger_data *data);
1600 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1601 int trigger_enable);
1602 extern void update_cond_flag(struct trace_event_file *file);
1603 extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
1604 struct event_trigger_data *test,
1605 struct trace_event_file *file);
1606 extern int set_trigger_filter(char *filter_str,
1607 struct event_trigger_data *trigger_data,
1608 struct trace_event_file *file);
1609 extern struct event_trigger_data *find_named_trigger(const char *name);
1610 extern bool is_named_trigger(struct event_trigger_data *test);
1611 extern int save_named_trigger(const char *name,
1612 struct event_trigger_data *data);
1613 extern void del_named_trigger(struct event_trigger_data *data);
1614 extern void pause_named_trigger(struct event_trigger_data *data);
1615 extern void unpause_named_trigger(struct event_trigger_data *data);
1616 extern void set_named_trigger_data(struct event_trigger_data *data,
1617 struct event_trigger_data *named_data);
1618 extern int register_event_command(struct event_command *cmd);
1619 extern int unregister_event_command(struct event_command *cmd);
1620 extern int register_trigger_hist_enable_disable_cmds(void);
1621
1622 /**
1623 * struct event_trigger_ops - callbacks for trace event triggers
1624 *
1625 * The methods in this structure provide per-event trigger hooks for
1626 * various trigger operations.
1627 *
1628 * All the methods below, except for @init() and @free(), must be
1629 * implemented.
1630 *
1631 * @func: The trigger 'probe' function called when the triggering
1632 * event occurs. The data passed into this callback is the data
1633 * that was supplied to the event_command @reg() function that
1634 * registered the trigger (see struct event_command) along with
1635 * the trace record, rec.
1636 *
1637 * @init: An optional initialization function called for the trigger
1638 * when the trigger is registered (via the event_command reg()
1639 * function). This can be used to perform per-trigger
1640 * initialization such as incrementing a per-trigger reference
1641 * count, for instance. This is usually implemented by the
1642 * generic utility function @event_trigger_init() (see
1643 * trace_event_triggers.c).
1644 *
1645 * @free: An optional de-initialization function called for the
1646 * trigger when the trigger is unregistered (via the
1647 * event_command @reg() function). This can be used to perform
1648 * per-trigger de-initialization such as decrementing a
1649 * per-trigger reference count and freeing corresponding trigger
1650 * data, for instance. This is usually implemented by the
1651 * generic utility function @event_trigger_free() (see
1652 * trace_event_triggers.c).
1653 *
1654 * @print: The callback function invoked to have the trigger print
1655 * itself. This is usually implemented by a wrapper function
1656 * that calls the generic utility function @event_trigger_print()
1657 * (see trace_event_triggers.c).
1658 */
1659 struct event_trigger_ops {
1660 void (*func)(struct event_trigger_data *data,
1661 void *rec);
1662 int (*init)(struct event_trigger_ops *ops,
1663 struct event_trigger_data *data);
1664 void (*free)(struct event_trigger_ops *ops,
1665 struct event_trigger_data *data);
1666 int (*print)(struct seq_file *m,
1667 struct event_trigger_ops *ops,
1668 struct event_trigger_data *data);
1669 };
1670
1671 /**
1672 * struct event_command - callbacks and data members for event commands
1673 *
1674 * Event commands are invoked by users by writing the command name
1675 * into the 'trigger' file associated with a trace event. The
1676 * parameters associated with a specific invocation of an event
1677 * command are used to create an event trigger instance, which is
1678 * added to the list of trigger instances associated with that trace
1679 * event. When the event is hit, the set of triggers associated with
1680 * that event is invoked.
1681 *
1682 * The data members in this structure provide per-event command data
1683 * for various event commands.
1684 *
1685 * All the data members below, except for @post_trigger, must be set
1686 * for each event command.
1687 *
1688 * @name: The unique name that identifies the event command. This is
1689 * the name used when setting triggers via trigger files.
1690 *
1691 * @trigger_type: A unique id that identifies the event command
1692 * 'type'. This value has two purposes, the first to ensure that
1693 * only one trigger of the same type can be set at a given time
1694 * for a particular event e.g. it doesn't make sense to have both
1695 * a traceon and traceoff trigger attached to a single event at
1696 * the same time, so traceon and traceoff have the same type
1697 * though they have different names. The @trigger_type value is
1698 * also used as a bit value for deferring the actual trigger
1699 * action until after the current event is finished. Some
1700 * commands need to do this if they themselves log to the trace
1701 * buffer (see the @post_trigger() member below). @trigger_type
1702 * values are defined by adding new values to the trigger_type
1703 * enum in include/linux/trace_events.h.
1704 *
1705 * @flags: See the enum event_command_flags below.
1706 *
1707 * All the methods below, except for @set_filter() and @unreg_all(),
1708 * must be implemented.
1709 *
1710 * @func: The callback function responsible for parsing and
1711 * registering the trigger written to the 'trigger' file by the
1712 * user. It allocates the trigger instance and registers it with
1713 * the appropriate trace event. It makes use of the other
1714 * event_command callback functions to orchestrate this, and is
1715 * usually implemented by the generic utility function
1716 * @event_trigger_callback() (see trace_event_triggers.c).
1717 *
1718 * @reg: Adds the trigger to the list of triggers associated with the
1719 * event, and enables the event trigger itself, after
1720 * initializing it (via the event_trigger_ops @init() function).
1721 * This is also where commands can use the @trigger_type value to
1722 * make the decision as to whether or not multiple instances of
1723 * the trigger should be allowed. This is usually implemented by
1724 * the generic utility function @register_trigger() (see
1725 * trace_event_triggers.c).
1726 *
1727 * @unreg: Removes the trigger from the list of triggers associated
1728 * with the event, and disables the event trigger itself, after
1729 * initializing it (via the event_trigger_ops @free() function).
1730 * This is usually implemented by the generic utility function
1731 * @unregister_trigger() (see trace_event_triggers.c).
1732 *
1733 * @unreg_all: An optional function called to remove all the triggers
1734 * from the list of triggers associated with the event. Called
1735 * when a trigger file is opened in truncate mode.
1736 *
1737 * @set_filter: An optional function called to parse and set a filter
1738 * for the trigger. If no @set_filter() method is set for the
1739 * event command, filters set by the user for the command will be
1740 * ignored. This is usually implemented by the generic utility
1741 * function @set_trigger_filter() (see trace_event_triggers.c).
1742 *
1743 * @get_trigger_ops: The callback function invoked to retrieve the
1744 * event_trigger_ops implementation associated with the command.
1745 */
1746 struct event_command {
1747 struct list_head list;
1748 char *name;
1749 enum event_trigger_type trigger_type;
1750 int flags;
1751 int (*func)(struct event_command *cmd_ops,
1752 struct trace_event_file *file,
1753 char *glob, char *cmd, char *params);
1754 int (*reg)(char *glob,
1755 struct event_trigger_ops *ops,
1756 struct event_trigger_data *data,
1757 struct trace_event_file *file);
1758 void (*unreg)(char *glob,
1759 struct event_trigger_ops *ops,
1760 struct event_trigger_data *data,
1761 struct trace_event_file *file);
1762 void (*unreg_all)(struct trace_event_file *file);
1763 int (*set_filter)(char *filter_str,
1764 struct event_trigger_data *data,
1765 struct trace_event_file *file);
1766 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1767 };
1768
1769 /**
1770 * enum event_command_flags - flags for struct event_command
1771 *
1772 * @POST_TRIGGER: A flag that says whether or not this command needs
1773 * to have its action delayed until after the current event has
1774 * been closed. Some triggers need to avoid being invoked while
1775 * an event is currently in the process of being logged, since
1776 * the trigger may itself log data into the trace buffer. Thus
1777 * we make sure the current event is committed before invoking
1778 * those triggers. To do that, the trigger invocation is split
1779 * in two - the first part checks the filter using the current
1780 * trace record; if a command has the @post_trigger flag set, it
1781 * sets a bit for itself in the return value, otherwise it
1782 * directly invokes the trigger. Once all commands have been
1783 * either invoked or set their return flag, the current record is
1784 * either committed or discarded. At that point, if any commands
1785 * have deferred their triggers, those commands are finally
1786 * invoked following the close of the current event. In other
1787 * words, if the event_trigger_ops @func() probe implementation
1788 * itself logs to the trace buffer, this flag should be set,
1789 * otherwise it can be left unspecified.
1790 *
1791 * @NEEDS_REC: A flag that says whether or not this command needs
1792 * access to the trace record in order to perform its function,
1793 * regardless of whether or not it has a filter associated with
1794 * it (filters make a trigger require access to the trace record
1795 * but are not always present).
1796 */
1797 enum event_command_flags {
1798 EVENT_CMD_FL_POST_TRIGGER = 1,
1799 EVENT_CMD_FL_NEEDS_REC = 2,
1800 };
1801
event_command_post_trigger(struct event_command * cmd_ops)1802 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1803 {
1804 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1805 }
1806
event_command_needs_rec(struct event_command * cmd_ops)1807 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1808 {
1809 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1810 }
1811
1812 extern int trace_event_enable_disable(struct trace_event_file *file,
1813 int enable, int soft_disable);
1814 extern int tracing_alloc_snapshot(void);
1815
1816 extern const char *__start___trace_bprintk_fmt[];
1817 extern const char *__stop___trace_bprintk_fmt[];
1818
1819 extern const char *__start___tracepoint_str[];
1820 extern const char *__stop___tracepoint_str[];
1821
1822 void trace_printk_control(bool enabled);
1823 void trace_printk_init_buffers(void);
1824 void trace_printk_start_comm(void);
1825 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1826 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1827
1828 /*
1829 * Normal trace_printk() and friends allocates special buffers
1830 * to do the manipulation, as well as saves the print formats
1831 * into sections to display. But the trace infrastructure wants
1832 * to use these without the added overhead at the price of being
1833 * a bit slower (used mainly for warnings, where we don't care
1834 * about performance). The internal_trace_puts() is for such
1835 * a purpose.
1836 */
1837 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1838
1839 #undef FTRACE_ENTRY
1840 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1841 extern struct trace_event_call \
1842 __aligned(4) event_##call;
1843 #undef FTRACE_ENTRY_DUP
1844 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1845 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1846 filter)
1847 #undef FTRACE_ENTRY_PACKED
1848 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \
1849 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1850 filter)
1851
1852 #include "trace_entries.h"
1853
1854 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1855 int perf_ftrace_event_register(struct trace_event_call *call,
1856 enum trace_reg type, void *data);
1857 #else
1858 #define perf_ftrace_event_register NULL
1859 #endif
1860
1861 #ifdef CONFIG_FTRACE_SYSCALLS
1862 void init_ftrace_syscalls(void);
1863 const char *get_syscall_name(int syscall);
1864 #else
init_ftrace_syscalls(void)1865 static inline void init_ftrace_syscalls(void) { }
get_syscall_name(int syscall)1866 static inline const char *get_syscall_name(int syscall)
1867 {
1868 return NULL;
1869 }
1870 #endif
1871
1872 #ifdef CONFIG_EVENT_TRACING
1873 void trace_event_init(void);
1874 void trace_event_eval_update(struct trace_eval_map **map, int len);
1875 #else
trace_event_init(void)1876 static inline void __init trace_event_init(void) { }
trace_event_eval_update(struct trace_eval_map ** map,int len)1877 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1878 #endif
1879
1880 #ifdef CONFIG_TRACER_SNAPSHOT
1881 void tracing_snapshot_instance(struct trace_array *tr);
1882 int tracing_alloc_snapshot_instance(struct trace_array *tr);
1883 #else
tracing_snapshot_instance(struct trace_array * tr)1884 static inline void tracing_snapshot_instance(struct trace_array *tr) { }
tracing_alloc_snapshot_instance(struct trace_array * tr)1885 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1886 {
1887 return 0;
1888 }
1889 #endif
1890
1891 extern struct trace_iterator *tracepoint_print_iter;
1892
1893 /*
1894 * Reset the state of the trace_iterator so that it can read consumed data.
1895 * Normally, the trace_iterator is used for reading the data when it is not
1896 * consumed, and must retain state.
1897 */
trace_iterator_reset(struct trace_iterator * iter)1898 static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1899 {
1900 const size_t offset = offsetof(struct trace_iterator, seq);
1901
1902 /*
1903 * Keep gcc from complaining about overwriting more than just one
1904 * member in the structure.
1905 */
1906 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
1907
1908 iter->pos = -1;
1909 }
1910
1911 #endif /* _LINUX_KERNEL_TRACE_H */
1912