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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
16enum 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 */
83struct syscall_trace_enter {
84 struct trace_entry ent;
85 int nr;
86 unsigned long args[];
87};
88
89struct syscall_trace_exit {
90 struct trace_entry ent;
91 int nr;
92 long ret;
93};
94
95struct kprobe_trace_entry_head {
96 struct trace_entry ent;
97 unsigned long ip;
98};
99
100struct kretprobe_trace_entry_head {
101 struct trace_entry ent;
102 unsigned long func;
103 unsigned long ret_ip;
104};
105
106struct 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 */
120enum 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 */
135struct 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 */
159struct 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. */
180extern 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 */
220struct 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 */
229struct 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 */
258struct 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
320int tracer_init(struct tracer *t, struct trace_array *tr);
321int tracing_is_enabled(void);
322void trace_wake_up(void);
323void tracing_reset(struct trace_array *tr, int cpu);
324void tracing_reset_online_cpus(struct trace_array *tr);
325void tracing_reset_current(int cpu);
326void tracing_reset_current_online_cpus(void);
327int tracing_open_generic(struct inode *inode, struct file *filp);
328struct 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
334struct dentry *tracing_init_dentry(void);
335
336struct ring_buffer_event;
337
338struct ring_buffer_event *
339trace_buffer_lock_reserve(struct ring_buffer *buffer,
340 int type,
341 unsigned long len,
342 unsigned long flags,
343 int pc);
344void trace_buffer_unlock_commit(struct ring_buffer *buffer,
345 struct ring_buffer_event *event,
346 unsigned long flags, int pc);
347
348struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
349 struct trace_array_cpu *data);
350
351struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
352 int *ent_cpu, u64 *ent_ts);
353
354int trace_empty(struct trace_iterator *iter);
355
356void *trace_find_next_entry_inc(struct trace_iterator *iter);
357
358void trace_init_global_iter(struct trace_iterator *iter);
359
360void tracing_iter_reset(struct trace_iterator *iter, int cpu);
361
362void default_wait_pipe(struct trace_iterator *iter);
363void poll_wait_pipe(struct trace_iterator *iter);
364
365void 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);
370void 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
375void tracing_sched_wakeup_trace(struct trace_array *tr,
376 struct task_struct *wakee,
377 struct task_struct *cur,
378 unsigned long flags, int pc);
379void trace_function(struct trace_array *tr,
380 unsigned long ip,
381 unsigned long parent_ip,
382 unsigned long flags, int pc);
383void trace_graph_function(struct trace_array *tr,
384 unsigned long ip,
385 unsigned long parent_ip,
386 unsigned long flags, int pc);
387void trace_latency_header(struct seq_file *m);
388void trace_default_header(struct seq_file *m);
389void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
390int trace_empty(struct trace_iterator *iter);
391
392void trace_graph_return(struct ftrace_graph_ret *trace);
393int trace_graph_entry(struct ftrace_graph_ent *trace);
394void set_graph_array(struct trace_array *tr);
395
396void tracing_start_cmdline_record(void);
397void tracing_stop_cmdline_record(void);
398void tracing_sched_switch_assign_trace(struct trace_array *tr);
399void tracing_stop_sched_switch_record(void);
400void tracing_start_sched_switch_record(void);
401int register_tracer(struct tracer *type);
402void unregister_tracer(struct tracer *type);
403int is_tracing_stopped(void);
404enum trace_file_type {
405 TRACE_FILE_LAT_FMT = 1,
406 TRACE_FILE_ANNOTATE = 2,
407};
408
409extern 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
414extern unsigned long nsecs_to_usecs(unsigned long nsecs);
415
416extern unsigned long tracing_thresh;
417
418#ifdef CONFIG_TRACER_MAX_TRACE
419extern unsigned long tracing_max_latency;
420
421void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
422void 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
427void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
428 int skip, int pc);
429
430void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
431 int skip, int pc, struct pt_regs *regs);
432
433void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
434 int pc);
435
436void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
437 int pc);
438#else
439static inline void ftrace_trace_stack(struct ring_buffer *buffer,
440 unsigned long flags, int skip, int pc)
441{
442}
443
444static 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
450static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
451 unsigned long flags, int pc)
452{
453}
454
455static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
456 int skip, int pc)
457{
458}
459#endif /* CONFIG_STACKTRACE */
460
461extern cycle_t ftrace_now(int cpu);
462
463extern void trace_find_cmdline(int pid, char comm[]);
464
465#ifdef CONFIG_DYNAMIC_FTRACE
466extern unsigned long ftrace_update_tot_cnt;
467#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
468extern int DYN_FTRACE_TEST_NAME(void);
469#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
470extern int DYN_FTRACE_TEST_NAME2(void);
471#endif
472
473extern int ring_buffer_expanded;
474extern bool tracing_selftest_disabled;
475DECLARE_PER_CPU(int, ftrace_cpu_disabled);
476
477#ifdef CONFIG_FTRACE_STARTUP_TEST
478extern int trace_selftest_startup_function(struct tracer *trace,
479 struct trace_array *tr);
480extern int trace_selftest_startup_function_graph(struct tracer *trace,
481 struct trace_array *tr);
482extern int trace_selftest_startup_irqsoff(struct tracer *trace,
483 struct trace_array *tr);
484extern int trace_selftest_startup_preemptoff(struct tracer *trace,
485 struct trace_array *tr);
486extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
487 struct trace_array *tr);
488extern int trace_selftest_startup_wakeup(struct tracer *trace,
489 struct trace_array *tr);
490extern int trace_selftest_startup_nop(struct tracer *trace,
491 struct trace_array *tr);
492extern int trace_selftest_startup_sched_switch(struct tracer *trace,
493 struct trace_array *tr);
494extern int trace_selftest_startup_branch(struct tracer *trace,
495 struct trace_array *tr);
496#endif /* CONFIG_FTRACE_STARTUP_TEST */
497
498extern void *head_page(struct trace_array_cpu *data);
499extern unsigned long long ns2usecs(cycle_t nsec);
500extern int
501trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
502extern int
503trace_vprintk(unsigned long ip, const char *fmt, va_list args);
504extern int
505trace_array_vprintk(struct trace_array *tr,
506 unsigned long ip, const char *fmt, va_list args);
507int trace_array_printk(struct trace_array *tr,
508 unsigned long ip, const char *fmt, ...);
509void trace_printk_seq(struct trace_seq *s);
510enum print_line_t print_trace_line(struct trace_iterator *iter);
511
512extern unsigned long trace_flags;
513
514extern 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
527extern enum print_line_t
528print_graph_function_flags(struct trace_iterator *iter, u32 flags);
529extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
530extern enum print_line_t
531trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
532extern void graph_trace_open(struct trace_iterator *iter);
533extern void graph_trace_close(struct trace_iterator *iter);
534extern int __trace_graph_entry(struct trace_array *tr,
535 struct ftrace_graph_ent *trace,
536 unsigned long flags, int pc);
537extern 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
545extern int ftrace_graph_filter_enabled;
546extern int ftrace_graph_count;
547extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
548
549static 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
574static inline int ftrace_graph_addr(unsigned long addr)
575{
576 return 1;
577}
578#endif /* CONFIG_DYNAMIC_FTRACE */
579#else /* CONFIG_FUNCTION_GRAPH_TRACER */
580static inline enum print_line_t
581print_graph_function_flags(struct trace_iterator *iter, u32 flags)
582{
583 return TRACE_TYPE_UNHANDLED;
584}
585#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
586
587extern struct list_head ftrace_pids;
588
589#ifdef CONFIG_FUNCTION_TRACER
590static 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}
597extern int ftrace_is_dead(void);
598#else
599static inline int ftrace_trace_task(struct task_struct *task)
600{
601 return 1;
602}
603static inline int ftrace_is_dead(void) { return 0; }
604#endif
605
606int 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 */
615struct trace_parser {
616 bool cont;
617 char *buffer;
618 unsigned idx;
619 unsigned size;
620};
621
622static inline bool trace_parser_loaded(struct trace_parser *parser)
623{
624 return (parser->idx != 0);
625}
626
627static inline bool trace_parser_cont(struct trace_parser *parser)
628{
629 return parser->cont;
630}
631
632static inline void trace_parser_clear(struct trace_parser *parser)
633{
634 parser->cont = false;
635 parser->idx = 0;
636}
637
638extern int trace_parser_get_init(struct trace_parser *parser, int size);
639extern void trace_parser_put(struct trace_parser *parser);
640extern 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 */
650enum 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
684extern struct tracer nop_trace;
685
686#ifdef CONFIG_BRANCH_TRACER
687extern int enable_branch_tracing(struct trace_array *tr);
688extern void disable_branch_tracing(void);
689static 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}
695static inline void trace_branch_disable(void)
696{
697 /* due to races, always disable */
698 disable_branch_tracing();
699}
700#else
701static inline int trace_branch_enable(struct trace_array *tr)
702{
703 return 0;
704}
705static 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 */
711int tracing_update_buffers(void);
712
713/* trace event type bit fields, not numeric */
714enum {
715 TRACE_EVENT_TYPE_PRINTF = 1,
716 TRACE_EVENT_TYPE_RAW = 2,
717};
718
719struct 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
729struct 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
737struct 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
759struct filter_pred;
760struct regex;
761
762typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
763
764typedef int (*regex_match_func)(char *str, struct regex *r, int len);
765
766enum regex_type {
767 MATCH_FULL = 0,
768 MATCH_FRONT_ONLY,
769 MATCH_MIDDLE_ONLY,
770 MATCH_END_ONLY,
771};
772
773struct regex {
774 char pattern[MAX_FILTER_STR_VAL];
775 int len;
776 int field_len;
777 regex_match_func match;
778};
779
780struct 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
795extern struct list_head ftrace_common_fields;
796
797extern enum regex_type
798filter_parse_regex(char *buff, int len, char **search, int *not);
799extern void print_event_filter(struct ftrace_event_call *call,
800 struct trace_seq *s);
801extern int apply_event_filter(struct ftrace_event_call *call,
802 char *filter_string);
803extern int apply_subsystem_event_filter(struct event_subsystem *system,
804 char *filter_string);
805extern void print_subsystem_event_filter(struct event_subsystem *system,
806 struct trace_seq *s);
807extern int filter_assign_type(const char *type);
808
809struct list_head *
810trace_get_fields(struct ftrace_event_call *event_call);
811
812static inline int
813filter_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
826extern void trace_event_enable_cmd_record(bool enable);
827
828extern struct mutex event_mutex;
829extern struct list_head ftrace_events;
830
831extern const char *__start___trace_bprintk_fmt[];
832extern const char *__stop___trace_bprintk_fmt[];
833
834void 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)
847int 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 */
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/trace.h>
15#include <linux/hw_breakpoint.h>
16#include <linux/trace_seq.h>
17#include <linux/trace_events.h>
18#include <linux/compiler.h>
19#include <linux/glob.h>
20#include <linux/irq_work.h>
21#include <linux/workqueue.h>
22#include <linux/ctype.h>
23#include <linux/once_lite.h>
24
25#ifdef CONFIG_FTRACE_SYSCALLS
26#include <asm/unistd.h> /* For NR_SYSCALLS */
27#include <asm/syscall.h> /* some archs define it here */
28#endif
29
30enum trace_type {
31 __TRACE_FIRST_TYPE = 0,
32
33 TRACE_FN,
34 TRACE_CTX,
35 TRACE_WAKE,
36 TRACE_STACK,
37 TRACE_PRINT,
38 TRACE_BPRINT,
39 TRACE_MMIO_RW,
40 TRACE_MMIO_MAP,
41 TRACE_BRANCH,
42 TRACE_GRAPH_RET,
43 TRACE_GRAPH_ENT,
44 TRACE_USER_STACK,
45 TRACE_BLK,
46 TRACE_BPUTS,
47 TRACE_HWLAT,
48 TRACE_OSNOISE,
49 TRACE_TIMERLAT,
50 TRACE_RAW_DATA,
51 TRACE_FUNC_REPEATS,
52
53 __TRACE_LAST_TYPE,
54};
55
56
57#undef __field
58#define __field(type, item) type item;
59
60#undef __field_fn
61#define __field_fn(type, item) type item;
62
63#undef __field_struct
64#define __field_struct(type, item) __field(type, item)
65
66#undef __field_desc
67#define __field_desc(type, container, item)
68
69#undef __field_packed
70#define __field_packed(type, container, item)
71
72#undef __array
73#define __array(type, item, size) type item[size];
74
75#undef __array_desc
76#define __array_desc(type, container, item, size)
77
78#undef __dynamic_array
79#define __dynamic_array(type, item) type item[];
80
81#undef F_STRUCT
82#define F_STRUCT(args...) args
83
84#undef FTRACE_ENTRY
85#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
86 struct struct_name { \
87 struct trace_entry ent; \
88 tstruct \
89 }
90
91#undef FTRACE_ENTRY_DUP
92#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
93
94#undef FTRACE_ENTRY_REG
95#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
96 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
97
98#undef FTRACE_ENTRY_PACKED
99#define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \
100 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed
101
102#include "trace_entries.h"
103
104/* Use this for memory failure errors */
105#define MEM_FAIL(condition, fmt, ...) \
106 DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__)
107
108/*
109 * syscalls are special, and need special handling, this is why
110 * they are not included in trace_entries.h
111 */
112struct syscall_trace_enter {
113 struct trace_entry ent;
114 int nr;
115 unsigned long args[];
116};
117
118struct syscall_trace_exit {
119 struct trace_entry ent;
120 int nr;
121 long ret;
122};
123
124struct kprobe_trace_entry_head {
125 struct trace_entry ent;
126 unsigned long ip;
127};
128
129struct kretprobe_trace_entry_head {
130 struct trace_entry ent;
131 unsigned long func;
132 unsigned long ret_ip;
133};
134
135#define TRACE_BUF_SIZE 1024
136
137struct trace_array;
138
139/*
140 * The CPU trace array - it consists of thousands of trace entries
141 * plus some other descriptor data: (for example which task started
142 * the trace, etc.)
143 */
144struct trace_array_cpu {
145 atomic_t disabled;
146 void *buffer_page; /* ring buffer spare */
147
148 unsigned long entries;
149 unsigned long saved_latency;
150 unsigned long critical_start;
151 unsigned long critical_end;
152 unsigned long critical_sequence;
153 unsigned long nice;
154 unsigned long policy;
155 unsigned long rt_priority;
156 unsigned long skipped_entries;
157 u64 preempt_timestamp;
158 pid_t pid;
159 kuid_t uid;
160 char comm[TASK_COMM_LEN];
161
162#ifdef CONFIG_FUNCTION_TRACER
163 int ftrace_ignore_pid;
164#endif
165 bool ignore_pid;
166};
167
168struct tracer;
169struct trace_option_dentry;
170
171struct array_buffer {
172 struct trace_array *tr;
173 struct trace_buffer *buffer;
174 struct trace_array_cpu __percpu *data;
175 u64 time_start;
176 int cpu;
177};
178
179#define TRACE_FLAGS_MAX_SIZE 32
180
181struct trace_options {
182 struct tracer *tracer;
183 struct trace_option_dentry *topts;
184};
185
186struct trace_pid_list {
187 int pid_max;
188 unsigned long *pids;
189};
190
191enum {
192 TRACE_PIDS = BIT(0),
193 TRACE_NO_PIDS = BIT(1),
194};
195
196static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list,
197 struct trace_pid_list *no_pid_list)
198{
199 /* Return true if the pid list in type has pids */
200 return ((type & TRACE_PIDS) && pid_list) ||
201 ((type & TRACE_NO_PIDS) && no_pid_list);
202}
203
204static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list,
205 struct trace_pid_list *no_pid_list)
206{
207 /*
208 * Turning off what is in @type, return true if the "other"
209 * pid list, still has pids in it.
210 */
211 return (!(type & TRACE_PIDS) && pid_list) ||
212 (!(type & TRACE_NO_PIDS) && no_pid_list);
213}
214
215typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
216
217/**
218 * struct cond_snapshot - conditional snapshot data and callback
219 *
220 * The cond_snapshot structure encapsulates a callback function and
221 * data associated with the snapshot for a given tracing instance.
222 *
223 * When a snapshot is taken conditionally, by invoking
224 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
225 * passed in turn to the cond_snapshot.update() function. That data
226 * can be compared by the update() implementation with the cond_data
227 * contained within the struct cond_snapshot instance associated with
228 * the trace_array. Because the tr->max_lock is held throughout the
229 * update() call, the update() function can directly retrieve the
230 * cond_snapshot and cond_data associated with the per-instance
231 * snapshot associated with the trace_array.
232 *
233 * The cond_snapshot.update() implementation can save data to be
234 * associated with the snapshot if it decides to, and returns 'true'
235 * in that case, or it returns 'false' if the conditional snapshot
236 * shouldn't be taken.
237 *
238 * The cond_snapshot instance is created and associated with the
239 * user-defined cond_data by tracing_cond_snapshot_enable().
240 * Likewise, the cond_snapshot instance is destroyed and is no longer
241 * associated with the trace instance by
242 * tracing_cond_snapshot_disable().
243 *
244 * The method below is required.
245 *
246 * @update: When a conditional snapshot is invoked, the update()
247 * callback function is invoked with the tr->max_lock held. The
248 * update() implementation signals whether or not to actually
249 * take the snapshot, by returning 'true' if so, 'false' if no
250 * snapshot should be taken. Because the max_lock is held for
251 * the duration of update(), the implementation is safe to
252 * directly retrieved and save any implementation data it needs
253 * to in association with the snapshot.
254 */
255struct cond_snapshot {
256 void *cond_data;
257 cond_update_fn_t update;
258};
259
260/*
261 * struct trace_func_repeats - used to keep track of the consecutive
262 * (on the same CPU) calls of a single function.
263 */
264struct trace_func_repeats {
265 unsigned long ip;
266 unsigned long parent_ip;
267 unsigned long count;
268 u64 ts_last_call;
269};
270
271/*
272 * The trace array - an array of per-CPU trace arrays. This is the
273 * highest level data structure that individual tracers deal with.
274 * They have on/off state as well:
275 */
276struct trace_array {
277 struct list_head list;
278 char *name;
279 struct array_buffer array_buffer;
280#ifdef CONFIG_TRACER_MAX_TRACE
281 /*
282 * The max_buffer is used to snapshot the trace when a maximum
283 * latency is reached, or when the user initiates a snapshot.
284 * Some tracers will use this to store a maximum trace while
285 * it continues examining live traces.
286 *
287 * The buffers for the max_buffer are set up the same as the array_buffer
288 * When a snapshot is taken, the buffer of the max_buffer is swapped
289 * with the buffer of the array_buffer and the buffers are reset for
290 * the array_buffer so the tracing can continue.
291 */
292 struct array_buffer max_buffer;
293 bool allocated_snapshot;
294#endif
295#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \
296 || defined(CONFIG_OSNOISE_TRACER)
297 unsigned long max_latency;
298#ifdef CONFIG_FSNOTIFY
299 struct dentry *d_max_latency;
300 struct work_struct fsnotify_work;
301 struct irq_work fsnotify_irqwork;
302#endif
303#endif
304 struct trace_pid_list __rcu *filtered_pids;
305 struct trace_pid_list __rcu *filtered_no_pids;
306 /*
307 * max_lock is used to protect the swapping of buffers
308 * when taking a max snapshot. The buffers themselves are
309 * protected by per_cpu spinlocks. But the action of the swap
310 * needs its own lock.
311 *
312 * This is defined as a arch_spinlock_t in order to help
313 * with performance when lockdep debugging is enabled.
314 *
315 * It is also used in other places outside the update_max_tr
316 * so it needs to be defined outside of the
317 * CONFIG_TRACER_MAX_TRACE.
318 */
319 arch_spinlock_t max_lock;
320 int buffer_disabled;
321#ifdef CONFIG_FTRACE_SYSCALLS
322 int sys_refcount_enter;
323 int sys_refcount_exit;
324 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
325 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
326#endif
327 int stop_count;
328 int clock_id;
329 int nr_topts;
330 bool clear_trace;
331 int buffer_percent;
332 unsigned int n_err_log_entries;
333 struct tracer *current_trace;
334 unsigned int trace_flags;
335 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
336 unsigned int flags;
337 raw_spinlock_t start_lock;
338 struct list_head err_log;
339 struct dentry *dir;
340 struct dentry *options;
341 struct dentry *percpu_dir;
342 struct dentry *event_dir;
343 struct trace_options *topts;
344 struct list_head systems;
345 struct list_head events;
346 struct trace_event_file *trace_marker_file;
347 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
348 int ref;
349 int trace_ref;
350#ifdef CONFIG_FUNCTION_TRACER
351 struct ftrace_ops *ops;
352 struct trace_pid_list __rcu *function_pids;
353 struct trace_pid_list __rcu *function_no_pids;
354#ifdef CONFIG_DYNAMIC_FTRACE
355 /* All of these are protected by the ftrace_lock */
356 struct list_head func_probes;
357 struct list_head mod_trace;
358 struct list_head mod_notrace;
359#endif
360 /* function tracing enabled */
361 int function_enabled;
362#endif
363 int no_filter_buffering_ref;
364 struct list_head hist_vars;
365#ifdef CONFIG_TRACER_SNAPSHOT
366 struct cond_snapshot *cond_snapshot;
367#endif
368 struct trace_func_repeats __percpu *last_func_repeats;
369};
370
371enum {
372 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
373};
374
375extern struct list_head ftrace_trace_arrays;
376
377extern struct mutex trace_types_lock;
378
379extern int trace_array_get(struct trace_array *tr);
380extern int tracing_check_open_get_tr(struct trace_array *tr);
381extern struct trace_array *trace_array_find(const char *instance);
382extern struct trace_array *trace_array_find_get(const char *instance);
383
384extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe);
385extern int tracing_set_filter_buffering(struct trace_array *tr, bool set);
386extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
387
388extern bool trace_clock_in_ns(struct trace_array *tr);
389
390/*
391 * The global tracer (top) should be the first trace array added,
392 * but we check the flag anyway.
393 */
394static inline struct trace_array *top_trace_array(void)
395{
396 struct trace_array *tr;
397
398 if (list_empty(&ftrace_trace_arrays))
399 return NULL;
400
401 tr = list_entry(ftrace_trace_arrays.prev,
402 typeof(*tr), list);
403 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
404 return tr;
405}
406
407#define FTRACE_CMP_TYPE(var, type) \
408 __builtin_types_compatible_p(typeof(var), type *)
409
410#undef IF_ASSIGN
411#define IF_ASSIGN(var, entry, etype, id) \
412 if (FTRACE_CMP_TYPE(var, etype)) { \
413 var = (typeof(var))(entry); \
414 WARN_ON(id != 0 && (entry)->type != id); \
415 break; \
416 }
417
418/* Will cause compile errors if type is not found. */
419extern void __ftrace_bad_type(void);
420
421/*
422 * The trace_assign_type is a verifier that the entry type is
423 * the same as the type being assigned. To add new types simply
424 * add a line with the following format:
425 *
426 * IF_ASSIGN(var, ent, type, id);
427 *
428 * Where "type" is the trace type that includes the trace_entry
429 * as the "ent" item. And "id" is the trace identifier that is
430 * used in the trace_type enum.
431 *
432 * If the type can have more than one id, then use zero.
433 */
434#define trace_assign_type(var, ent) \
435 do { \
436 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
437 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
438 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
439 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
440 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
441 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
442 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
443 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
444 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\
445 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\
446 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
447 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
448 TRACE_MMIO_RW); \
449 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
450 TRACE_MMIO_MAP); \
451 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
452 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
453 TRACE_GRAPH_ENT); \
454 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
455 TRACE_GRAPH_RET); \
456 IF_ASSIGN(var, ent, struct func_repeats_entry, \
457 TRACE_FUNC_REPEATS); \
458 __ftrace_bad_type(); \
459 } while (0)
460
461/*
462 * An option specific to a tracer. This is a boolean value.
463 * The bit is the bit index that sets its value on the
464 * flags value in struct tracer_flags.
465 */
466struct tracer_opt {
467 const char *name; /* Will appear on the trace_options file */
468 u32 bit; /* Mask assigned in val field in tracer_flags */
469};
470
471/*
472 * The set of specific options for a tracer. Your tracer
473 * have to set the initial value of the flags val.
474 */
475struct tracer_flags {
476 u32 val;
477 struct tracer_opt *opts;
478 struct tracer *trace;
479};
480
481/* Makes more easy to define a tracer opt */
482#define TRACER_OPT(s, b) .name = #s, .bit = b
483
484
485struct trace_option_dentry {
486 struct tracer_opt *opt;
487 struct tracer_flags *flags;
488 struct trace_array *tr;
489 struct dentry *entry;
490};
491
492/**
493 * struct tracer - a specific tracer and its callbacks to interact with tracefs
494 * @name: the name chosen to select it on the available_tracers file
495 * @init: called when one switches to this tracer (echo name > current_tracer)
496 * @reset: called when one switches to another tracer
497 * @start: called when tracing is unpaused (echo 1 > tracing_on)
498 * @stop: called when tracing is paused (echo 0 > tracing_on)
499 * @update_thresh: called when tracing_thresh is updated
500 * @open: called when the trace file is opened
501 * @pipe_open: called when the trace_pipe file is opened
502 * @close: called when the trace file is released
503 * @pipe_close: called when the trace_pipe file is released
504 * @read: override the default read callback on trace_pipe
505 * @splice_read: override the default splice_read callback on trace_pipe
506 * @selftest: selftest to run on boot (see trace_selftest.c)
507 * @print_headers: override the first lines that describe your columns
508 * @print_line: callback that prints a trace
509 * @set_flag: signals one of your private flags changed (trace_options file)
510 * @flags: your private flags
511 */
512struct tracer {
513 const char *name;
514 int (*init)(struct trace_array *tr);
515 void (*reset)(struct trace_array *tr);
516 void (*start)(struct trace_array *tr);
517 void (*stop)(struct trace_array *tr);
518 int (*update_thresh)(struct trace_array *tr);
519 void (*open)(struct trace_iterator *iter);
520 void (*pipe_open)(struct trace_iterator *iter);
521 void (*close)(struct trace_iterator *iter);
522 void (*pipe_close)(struct trace_iterator *iter);
523 ssize_t (*read)(struct trace_iterator *iter,
524 struct file *filp, char __user *ubuf,
525 size_t cnt, loff_t *ppos);
526 ssize_t (*splice_read)(struct trace_iterator *iter,
527 struct file *filp,
528 loff_t *ppos,
529 struct pipe_inode_info *pipe,
530 size_t len,
531 unsigned int flags);
532#ifdef CONFIG_FTRACE_STARTUP_TEST
533 int (*selftest)(struct tracer *trace,
534 struct trace_array *tr);
535#endif
536 void (*print_header)(struct seq_file *m);
537 enum print_line_t (*print_line)(struct trace_iterator *iter);
538 /* If you handled the flag setting, return 0 */
539 int (*set_flag)(struct trace_array *tr,
540 u32 old_flags, u32 bit, int set);
541 /* Return 0 if OK with change, else return non-zero */
542 int (*flag_changed)(struct trace_array *tr,
543 u32 mask, int set);
544 struct tracer *next;
545 struct tracer_flags *flags;
546 int enabled;
547 bool print_max;
548 bool allow_instances;
549#ifdef CONFIG_TRACER_MAX_TRACE
550 bool use_max_tr;
551#endif
552 /* True if tracer cannot be enabled in kernel param */
553 bool noboot;
554};
555
556static inline struct ring_buffer_iter *
557trace_buffer_iter(struct trace_iterator *iter, int cpu)
558{
559 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
560}
561
562int tracer_init(struct tracer *t, struct trace_array *tr);
563int tracing_is_enabled(void);
564void tracing_reset_online_cpus(struct array_buffer *buf);
565void tracing_reset_current(int cpu);
566void tracing_reset_all_online_cpus(void);
567int tracing_open_generic(struct inode *inode, struct file *filp);
568int tracing_open_generic_tr(struct inode *inode, struct file *filp);
569bool tracing_is_disabled(void);
570bool tracer_tracing_is_on(struct trace_array *tr);
571void tracer_tracing_on(struct trace_array *tr);
572void tracer_tracing_off(struct trace_array *tr);
573struct dentry *trace_create_file(const char *name,
574 umode_t mode,
575 struct dentry *parent,
576 void *data,
577 const struct file_operations *fops);
578
579int tracing_init_dentry(void);
580
581struct ring_buffer_event;
582
583struct ring_buffer_event *
584trace_buffer_lock_reserve(struct trace_buffer *buffer,
585 int type,
586 unsigned long len,
587 unsigned int trace_ctx);
588
589struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
590 struct trace_array_cpu *data);
591
592struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
593 int *ent_cpu, u64 *ent_ts);
594
595void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
596 struct ring_buffer_event *event);
597
598bool trace_is_tracepoint_string(const char *str);
599const char *trace_event_format(struct trace_iterator *iter, const char *fmt);
600void trace_check_vprintf(struct trace_iterator *iter, const char *fmt,
601 va_list ap);
602
603int trace_empty(struct trace_iterator *iter);
604
605void *trace_find_next_entry_inc(struct trace_iterator *iter);
606
607void trace_init_global_iter(struct trace_iterator *iter);
608
609void tracing_iter_reset(struct trace_iterator *iter, int cpu);
610
611unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
612unsigned long trace_total_entries(struct trace_array *tr);
613
614void trace_function(struct trace_array *tr,
615 unsigned long ip,
616 unsigned long parent_ip,
617 unsigned int trace_ctx);
618void trace_graph_function(struct trace_array *tr,
619 unsigned long ip,
620 unsigned long parent_ip,
621 unsigned int trace_ctx);
622void trace_latency_header(struct seq_file *m);
623void trace_default_header(struct seq_file *m);
624void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
625
626void trace_graph_return(struct ftrace_graph_ret *trace);
627int trace_graph_entry(struct ftrace_graph_ent *trace);
628void set_graph_array(struct trace_array *tr);
629
630void tracing_start_cmdline_record(void);
631void tracing_stop_cmdline_record(void);
632void tracing_start_tgid_record(void);
633void tracing_stop_tgid_record(void);
634
635int register_tracer(struct tracer *type);
636int is_tracing_stopped(void);
637
638loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
639
640extern cpumask_var_t __read_mostly tracing_buffer_mask;
641
642#define for_each_tracing_cpu(cpu) \
643 for_each_cpu(cpu, tracing_buffer_mask)
644
645extern unsigned long nsecs_to_usecs(unsigned long nsecs);
646
647extern unsigned long tracing_thresh;
648
649/* PID filtering */
650
651extern int pid_max;
652
653bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
654 pid_t search_pid);
655bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
656 struct trace_pid_list *filtered_no_pids,
657 struct task_struct *task);
658void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
659 struct task_struct *self,
660 struct task_struct *task);
661void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
662void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
663int trace_pid_show(struct seq_file *m, void *v);
664void trace_free_pid_list(struct trace_pid_list *pid_list);
665int trace_pid_write(struct trace_pid_list *filtered_pids,
666 struct trace_pid_list **new_pid_list,
667 const char __user *ubuf, size_t cnt);
668
669#ifdef CONFIG_TRACER_MAX_TRACE
670void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
671 void *cond_data);
672void update_max_tr_single(struct trace_array *tr,
673 struct task_struct *tsk, int cpu);
674#endif /* CONFIG_TRACER_MAX_TRACE */
675
676#if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \
677 || defined(CONFIG_OSNOISE_TRACER)) && defined(CONFIG_FSNOTIFY)
678#define LATENCY_FS_NOTIFY
679#endif
680
681#ifdef LATENCY_FS_NOTIFY
682void latency_fsnotify(struct trace_array *tr);
683#else
684static inline void latency_fsnotify(struct trace_array *tr) { }
685#endif
686
687#ifdef CONFIG_STACKTRACE
688void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip);
689#else
690static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
691 int skip)
692{
693}
694#endif /* CONFIG_STACKTRACE */
695
696void trace_last_func_repeats(struct trace_array *tr,
697 struct trace_func_repeats *last_info,
698 unsigned int trace_ctx);
699
700extern u64 ftrace_now(int cpu);
701
702extern void trace_find_cmdline(int pid, char comm[]);
703extern int trace_find_tgid(int pid);
704extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
705
706#ifdef CONFIG_DYNAMIC_FTRACE
707extern unsigned long ftrace_update_tot_cnt;
708extern unsigned long ftrace_number_of_pages;
709extern unsigned long ftrace_number_of_groups;
710void ftrace_init_trace_array(struct trace_array *tr);
711#else
712static inline void ftrace_init_trace_array(struct trace_array *tr) { }
713#endif
714#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
715extern int DYN_FTRACE_TEST_NAME(void);
716#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
717extern int DYN_FTRACE_TEST_NAME2(void);
718
719extern bool ring_buffer_expanded;
720extern bool tracing_selftest_disabled;
721
722#ifdef CONFIG_FTRACE_STARTUP_TEST
723extern void __init disable_tracing_selftest(const char *reason);
724
725extern int trace_selftest_startup_function(struct tracer *trace,
726 struct trace_array *tr);
727extern int trace_selftest_startup_function_graph(struct tracer *trace,
728 struct trace_array *tr);
729extern int trace_selftest_startup_irqsoff(struct tracer *trace,
730 struct trace_array *tr);
731extern int trace_selftest_startup_preemptoff(struct tracer *trace,
732 struct trace_array *tr);
733extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
734 struct trace_array *tr);
735extern int trace_selftest_startup_wakeup(struct tracer *trace,
736 struct trace_array *tr);
737extern int trace_selftest_startup_nop(struct tracer *trace,
738 struct trace_array *tr);
739extern int trace_selftest_startup_branch(struct tracer *trace,
740 struct trace_array *tr);
741/*
742 * Tracer data references selftest functions that only occur
743 * on boot up. These can be __init functions. Thus, when selftests
744 * are enabled, then the tracers need to reference __init functions.
745 */
746#define __tracer_data __refdata
747#else
748static inline void __init disable_tracing_selftest(const char *reason)
749{
750}
751/* Tracers are seldom changed. Optimize when selftests are disabled. */
752#define __tracer_data __read_mostly
753#endif /* CONFIG_FTRACE_STARTUP_TEST */
754
755extern void *head_page(struct trace_array_cpu *data);
756extern unsigned long long ns2usecs(u64 nsec);
757extern int
758trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
759extern int
760trace_vprintk(unsigned long ip, const char *fmt, va_list args);
761extern int
762trace_array_vprintk(struct trace_array *tr,
763 unsigned long ip, const char *fmt, va_list args);
764int trace_array_printk_buf(struct trace_buffer *buffer,
765 unsigned long ip, const char *fmt, ...);
766void trace_printk_seq(struct trace_seq *s);
767enum print_line_t print_trace_line(struct trace_iterator *iter);
768
769extern char trace_find_mark(unsigned long long duration);
770
771struct ftrace_hash;
772
773struct ftrace_mod_load {
774 struct list_head list;
775 char *func;
776 char *module;
777 int enable;
778};
779
780enum {
781 FTRACE_HASH_FL_MOD = (1 << 0),
782};
783
784struct ftrace_hash {
785 unsigned long size_bits;
786 struct hlist_head *buckets;
787 unsigned long count;
788 unsigned long flags;
789 struct rcu_head rcu;
790};
791
792struct ftrace_func_entry *
793ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
794
795static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
796{
797 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
798}
799
800/* Standard output formatting function used for function return traces */
801#ifdef CONFIG_FUNCTION_GRAPH_TRACER
802
803/* Flag options */
804#define TRACE_GRAPH_PRINT_OVERRUN 0x1
805#define TRACE_GRAPH_PRINT_CPU 0x2
806#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
807#define TRACE_GRAPH_PRINT_PROC 0x8
808#define TRACE_GRAPH_PRINT_DURATION 0x10
809#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
810#define TRACE_GRAPH_PRINT_REL_TIME 0x40
811#define TRACE_GRAPH_PRINT_IRQS 0x80
812#define TRACE_GRAPH_PRINT_TAIL 0x100
813#define TRACE_GRAPH_SLEEP_TIME 0x200
814#define TRACE_GRAPH_GRAPH_TIME 0x400
815#define TRACE_GRAPH_PRINT_FILL_SHIFT 28
816#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
817
818extern void ftrace_graph_sleep_time_control(bool enable);
819
820#ifdef CONFIG_FUNCTION_PROFILER
821extern void ftrace_graph_graph_time_control(bool enable);
822#else
823static inline void ftrace_graph_graph_time_control(bool enable) { }
824#endif
825
826extern enum print_line_t
827print_graph_function_flags(struct trace_iterator *iter, u32 flags);
828extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
829extern void
830trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
831extern void graph_trace_open(struct trace_iterator *iter);
832extern void graph_trace_close(struct trace_iterator *iter);
833extern int __trace_graph_entry(struct trace_array *tr,
834 struct ftrace_graph_ent *trace,
835 unsigned int trace_ctx);
836extern void __trace_graph_return(struct trace_array *tr,
837 struct ftrace_graph_ret *trace,
838 unsigned int trace_ctx);
839
840#ifdef CONFIG_DYNAMIC_FTRACE
841extern struct ftrace_hash __rcu *ftrace_graph_hash;
842extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
843
844static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
845{
846 unsigned long addr = trace->func;
847 int ret = 0;
848 struct ftrace_hash *hash;
849
850 preempt_disable_notrace();
851
852 /*
853 * Have to open code "rcu_dereference_sched()" because the
854 * function graph tracer can be called when RCU is not
855 * "watching".
856 * Protected with schedule_on_each_cpu(ftrace_sync)
857 */
858 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
859
860 if (ftrace_hash_empty(hash)) {
861 ret = 1;
862 goto out;
863 }
864
865 if (ftrace_lookup_ip(hash, addr)) {
866
867 /*
868 * This needs to be cleared on the return functions
869 * when the depth is zero.
870 */
871 trace_recursion_set(TRACE_GRAPH_BIT);
872 trace_recursion_set_depth(trace->depth);
873
874 /*
875 * If no irqs are to be traced, but a set_graph_function
876 * is set, and called by an interrupt handler, we still
877 * want to trace it.
878 */
879 if (in_irq())
880 trace_recursion_set(TRACE_IRQ_BIT);
881 else
882 trace_recursion_clear(TRACE_IRQ_BIT);
883 ret = 1;
884 }
885
886out:
887 preempt_enable_notrace();
888 return ret;
889}
890
891static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
892{
893 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
894 trace->depth == trace_recursion_depth())
895 trace_recursion_clear(TRACE_GRAPH_BIT);
896}
897
898static inline int ftrace_graph_notrace_addr(unsigned long addr)
899{
900 int ret = 0;
901 struct ftrace_hash *notrace_hash;
902
903 preempt_disable_notrace();
904
905 /*
906 * Have to open code "rcu_dereference_sched()" because the
907 * function graph tracer can be called when RCU is not
908 * "watching".
909 * Protected with schedule_on_each_cpu(ftrace_sync)
910 */
911 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
912 !preemptible());
913
914 if (ftrace_lookup_ip(notrace_hash, addr))
915 ret = 1;
916
917 preempt_enable_notrace();
918 return ret;
919}
920#else
921static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
922{
923 return 1;
924}
925
926static inline int ftrace_graph_notrace_addr(unsigned long addr)
927{
928 return 0;
929}
930static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
931{ }
932#endif /* CONFIG_DYNAMIC_FTRACE */
933
934extern unsigned int fgraph_max_depth;
935
936static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
937{
938 /* trace it when it is-nested-in or is a function enabled. */
939 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
940 ftrace_graph_addr(trace)) ||
941 (trace->depth < 0) ||
942 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
943}
944
945#else /* CONFIG_FUNCTION_GRAPH_TRACER */
946static inline enum print_line_t
947print_graph_function_flags(struct trace_iterator *iter, u32 flags)
948{
949 return TRACE_TYPE_UNHANDLED;
950}
951#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
952
953extern struct list_head ftrace_pids;
954
955#ifdef CONFIG_FUNCTION_TRACER
956
957#define FTRACE_PID_IGNORE -1
958#define FTRACE_PID_TRACE -2
959
960struct ftrace_func_command {
961 struct list_head list;
962 char *name;
963 int (*func)(struct trace_array *tr,
964 struct ftrace_hash *hash,
965 char *func, char *cmd,
966 char *params, int enable);
967};
968extern bool ftrace_filter_param __initdata;
969static inline int ftrace_trace_task(struct trace_array *tr)
970{
971 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) !=
972 FTRACE_PID_IGNORE;
973}
974extern int ftrace_is_dead(void);
975int ftrace_create_function_files(struct trace_array *tr,
976 struct dentry *parent);
977void ftrace_destroy_function_files(struct trace_array *tr);
978int ftrace_allocate_ftrace_ops(struct trace_array *tr);
979void ftrace_free_ftrace_ops(struct trace_array *tr);
980void ftrace_init_global_array_ops(struct trace_array *tr);
981void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
982void ftrace_reset_array_ops(struct trace_array *tr);
983void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
984void ftrace_init_tracefs_toplevel(struct trace_array *tr,
985 struct dentry *d_tracer);
986void ftrace_clear_pids(struct trace_array *tr);
987int init_function_trace(void);
988void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
989#else
990static inline int ftrace_trace_task(struct trace_array *tr)
991{
992 return 1;
993}
994static inline int ftrace_is_dead(void) { return 0; }
995static inline int
996ftrace_create_function_files(struct trace_array *tr,
997 struct dentry *parent)
998{
999 return 0;
1000}
1001static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr)
1002{
1003 return 0;
1004}
1005static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { }
1006static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1007static inline __init void
1008ftrace_init_global_array_ops(struct trace_array *tr) { }
1009static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1010static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
1011static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
1012static inline void ftrace_clear_pids(struct trace_array *tr) { }
1013static inline int init_function_trace(void) { return 0; }
1014static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1015/* ftace_func_t type is not defined, use macro instead of static inline */
1016#define ftrace_init_array_ops(tr, func) do { } while (0)
1017#endif /* CONFIG_FUNCTION_TRACER */
1018
1019#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1020
1021struct ftrace_probe_ops {
1022 void (*func)(unsigned long ip,
1023 unsigned long parent_ip,
1024 struct trace_array *tr,
1025 struct ftrace_probe_ops *ops,
1026 void *data);
1027 int (*init)(struct ftrace_probe_ops *ops,
1028 struct trace_array *tr,
1029 unsigned long ip, void *init_data,
1030 void **data);
1031 void (*free)(struct ftrace_probe_ops *ops,
1032 struct trace_array *tr,
1033 unsigned long ip, void *data);
1034 int (*print)(struct seq_file *m,
1035 unsigned long ip,
1036 struct ftrace_probe_ops *ops,
1037 void *data);
1038};
1039
1040struct ftrace_func_mapper;
1041typedef int (*ftrace_mapper_func)(void *data);
1042
1043struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1044void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1045 unsigned long ip);
1046int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1047 unsigned long ip, void *data);
1048void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1049 unsigned long ip);
1050void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1051 ftrace_mapper_func free_func);
1052
1053extern int
1054register_ftrace_function_probe(char *glob, struct trace_array *tr,
1055 struct ftrace_probe_ops *ops, void *data);
1056extern int
1057unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1058 struct ftrace_probe_ops *ops);
1059extern void clear_ftrace_function_probes(struct trace_array *tr);
1060
1061int register_ftrace_command(struct ftrace_func_command *cmd);
1062int unregister_ftrace_command(struct ftrace_func_command *cmd);
1063
1064void ftrace_create_filter_files(struct ftrace_ops *ops,
1065 struct dentry *parent);
1066void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1067
1068extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
1069 int len, int reset);
1070extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
1071 int len, int reset);
1072#else
1073struct ftrace_func_command;
1074
1075static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1076{
1077 return -EINVAL;
1078}
1079static inline __init int unregister_ftrace_command(char *cmd_name)
1080{
1081 return -EINVAL;
1082}
1083static inline void clear_ftrace_function_probes(struct trace_array *tr)
1084{
1085}
1086
1087/*
1088 * The ops parameter passed in is usually undefined.
1089 * This must be a macro.
1090 */
1091#define ftrace_create_filter_files(ops, parent) do { } while (0)
1092#define ftrace_destroy_filter_files(ops) do { } while (0)
1093#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1094
1095bool ftrace_event_is_function(struct trace_event_call *call);
1096
1097/*
1098 * struct trace_parser - servers for reading the user input separated by spaces
1099 * @cont: set if the input is not complete - no final space char was found
1100 * @buffer: holds the parsed user input
1101 * @idx: user input length
1102 * @size: buffer size
1103 */
1104struct trace_parser {
1105 bool cont;
1106 char *buffer;
1107 unsigned idx;
1108 unsigned size;
1109};
1110
1111static inline bool trace_parser_loaded(struct trace_parser *parser)
1112{
1113 return (parser->idx != 0);
1114}
1115
1116static inline bool trace_parser_cont(struct trace_parser *parser)
1117{
1118 return parser->cont;
1119}
1120
1121static inline void trace_parser_clear(struct trace_parser *parser)
1122{
1123 parser->cont = false;
1124 parser->idx = 0;
1125}
1126
1127extern int trace_parser_get_init(struct trace_parser *parser, int size);
1128extern void trace_parser_put(struct trace_parser *parser);
1129extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1130 size_t cnt, loff_t *ppos);
1131
1132/*
1133 * Only create function graph options if function graph is configured.
1134 */
1135#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1136# define FGRAPH_FLAGS \
1137 C(DISPLAY_GRAPH, "display-graph"),
1138#else
1139# define FGRAPH_FLAGS
1140#endif
1141
1142#ifdef CONFIG_BRANCH_TRACER
1143# define BRANCH_FLAGS \
1144 C(BRANCH, "branch"),
1145#else
1146# define BRANCH_FLAGS
1147#endif
1148
1149#ifdef CONFIG_FUNCTION_TRACER
1150# define FUNCTION_FLAGS \
1151 C(FUNCTION, "function-trace"), \
1152 C(FUNC_FORK, "function-fork"),
1153# define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1154#else
1155# define FUNCTION_FLAGS
1156# define FUNCTION_DEFAULT_FLAGS 0UL
1157# define TRACE_ITER_FUNC_FORK 0UL
1158#endif
1159
1160#ifdef CONFIG_STACKTRACE
1161# define STACK_FLAGS \
1162 C(STACKTRACE, "stacktrace"),
1163#else
1164# define STACK_FLAGS
1165#endif
1166
1167/*
1168 * trace_iterator_flags is an enumeration that defines bit
1169 * positions into trace_flags that controls the output.
1170 *
1171 * NOTE: These bits must match the trace_options array in
1172 * trace.c (this macro guarantees it).
1173 */
1174#define TRACE_FLAGS \
1175 C(PRINT_PARENT, "print-parent"), \
1176 C(SYM_OFFSET, "sym-offset"), \
1177 C(SYM_ADDR, "sym-addr"), \
1178 C(VERBOSE, "verbose"), \
1179 C(RAW, "raw"), \
1180 C(HEX, "hex"), \
1181 C(BIN, "bin"), \
1182 C(BLOCK, "block"), \
1183 C(PRINTK, "trace_printk"), \
1184 C(ANNOTATE, "annotate"), \
1185 C(USERSTACKTRACE, "userstacktrace"), \
1186 C(SYM_USEROBJ, "sym-userobj"), \
1187 C(PRINTK_MSGONLY, "printk-msg-only"), \
1188 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1189 C(LATENCY_FMT, "latency-format"), \
1190 C(RECORD_CMD, "record-cmd"), \
1191 C(RECORD_TGID, "record-tgid"), \
1192 C(OVERWRITE, "overwrite"), \
1193 C(STOP_ON_FREE, "disable_on_free"), \
1194 C(IRQ_INFO, "irq-info"), \
1195 C(MARKERS, "markers"), \
1196 C(EVENT_FORK, "event-fork"), \
1197 C(PAUSE_ON_TRACE, "pause-on-trace"), \
1198 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \
1199 FUNCTION_FLAGS \
1200 FGRAPH_FLAGS \
1201 STACK_FLAGS \
1202 BRANCH_FLAGS
1203
1204/*
1205 * By defining C, we can make TRACE_FLAGS a list of bit names
1206 * that will define the bits for the flag masks.
1207 */
1208#undef C
1209#define C(a, b) TRACE_ITER_##a##_BIT
1210
1211enum trace_iterator_bits {
1212 TRACE_FLAGS
1213 /* Make sure we don't go more than we have bits for */
1214 TRACE_ITER_LAST_BIT
1215};
1216
1217/*
1218 * By redefining C, we can make TRACE_FLAGS a list of masks that
1219 * use the bits as defined above.
1220 */
1221#undef C
1222#define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1223
1224enum trace_iterator_flags { TRACE_FLAGS };
1225
1226/*
1227 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1228 * control the output of kernel symbols.
1229 */
1230#define TRACE_ITER_SYM_MASK \
1231 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1232
1233extern struct tracer nop_trace;
1234
1235#ifdef CONFIG_BRANCH_TRACER
1236extern int enable_branch_tracing(struct trace_array *tr);
1237extern void disable_branch_tracing(void);
1238static inline int trace_branch_enable(struct trace_array *tr)
1239{
1240 if (tr->trace_flags & TRACE_ITER_BRANCH)
1241 return enable_branch_tracing(tr);
1242 return 0;
1243}
1244static inline void trace_branch_disable(void)
1245{
1246 /* due to races, always disable */
1247 disable_branch_tracing();
1248}
1249#else
1250static inline int trace_branch_enable(struct trace_array *tr)
1251{
1252 return 0;
1253}
1254static inline void trace_branch_disable(void)
1255{
1256}
1257#endif /* CONFIG_BRANCH_TRACER */
1258
1259/* set ring buffers to default size if not already done so */
1260int tracing_update_buffers(void);
1261
1262struct ftrace_event_field {
1263 struct list_head link;
1264 const char *name;
1265 const char *type;
1266 int filter_type;
1267 int offset;
1268 int size;
1269 int is_signed;
1270};
1271
1272struct prog_entry;
1273
1274struct event_filter {
1275 struct prog_entry __rcu *prog;
1276 char *filter_string;
1277};
1278
1279struct event_subsystem {
1280 struct list_head list;
1281 const char *name;
1282 struct event_filter *filter;
1283 int ref_count;
1284};
1285
1286struct trace_subsystem_dir {
1287 struct list_head list;
1288 struct event_subsystem *subsystem;
1289 struct trace_array *tr;
1290 struct dentry *entry;
1291 int ref_count;
1292 int nr_events;
1293};
1294
1295extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1296 struct trace_buffer *buffer,
1297 struct ring_buffer_event *event);
1298
1299void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1300 struct trace_buffer *buffer,
1301 struct ring_buffer_event *event,
1302 unsigned int trcace_ctx,
1303 struct pt_regs *regs);
1304
1305static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1306 struct trace_buffer *buffer,
1307 struct ring_buffer_event *event,
1308 unsigned int trace_ctx)
1309{
1310 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL);
1311}
1312
1313DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1314DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1315void trace_buffered_event_disable(void);
1316void trace_buffered_event_enable(void);
1317
1318static inline void
1319__trace_event_discard_commit(struct trace_buffer *buffer,
1320 struct ring_buffer_event *event)
1321{
1322 if (this_cpu_read(trace_buffered_event) == event) {
1323 /* Simply release the temp buffer */
1324 this_cpu_dec(trace_buffered_event_cnt);
1325 return;
1326 }
1327 ring_buffer_discard_commit(buffer, event);
1328}
1329
1330/*
1331 * Helper function for event_trigger_unlock_commit{_regs}().
1332 * If there are event triggers attached to this event that requires
1333 * filtering against its fields, then they will be called as the
1334 * entry already holds the field information of the current event.
1335 *
1336 * It also checks if the event should be discarded or not.
1337 * It is to be discarded if the event is soft disabled and the
1338 * event was only recorded to process triggers, or if the event
1339 * filter is active and this event did not match the filters.
1340 *
1341 * Returns true if the event is discarded, false otherwise.
1342 */
1343static inline bool
1344__event_trigger_test_discard(struct trace_event_file *file,
1345 struct trace_buffer *buffer,
1346 struct ring_buffer_event *event,
1347 void *entry,
1348 enum event_trigger_type *tt)
1349{
1350 unsigned long eflags = file->flags;
1351
1352 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1353 *tt = event_triggers_call(file, buffer, entry, event);
1354
1355 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1356 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1357 !filter_match_preds(file->filter, entry))) {
1358 __trace_event_discard_commit(buffer, event);
1359 return true;
1360 }
1361
1362 return false;
1363}
1364
1365/**
1366 * event_trigger_unlock_commit - handle triggers and finish event commit
1367 * @file: The file pointer associated with the event
1368 * @buffer: The ring buffer that the event is being written to
1369 * @event: The event meta data in the ring buffer
1370 * @entry: The event itself
1371 * @trace_ctx: The tracing context flags.
1372 *
1373 * This is a helper function to handle triggers that require data
1374 * from the event itself. It also tests the event against filters and
1375 * if the event is soft disabled and should be discarded.
1376 */
1377static inline void
1378event_trigger_unlock_commit(struct trace_event_file *file,
1379 struct trace_buffer *buffer,
1380 struct ring_buffer_event *event,
1381 void *entry, unsigned int trace_ctx)
1382{
1383 enum event_trigger_type tt = ETT_NONE;
1384
1385 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1386 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx);
1387
1388 if (tt)
1389 event_triggers_post_call(file, tt);
1390}
1391
1392#define FILTER_PRED_INVALID ((unsigned short)-1)
1393#define FILTER_PRED_IS_RIGHT (1 << 15)
1394#define FILTER_PRED_FOLD (1 << 15)
1395
1396/*
1397 * The max preds is the size of unsigned short with
1398 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1399 * and FOLD flags. The other is reserved.
1400 *
1401 * 2^14 preds is way more than enough.
1402 */
1403#define MAX_FILTER_PRED 16384
1404
1405struct filter_pred;
1406struct regex;
1407
1408typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1409
1410typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1411
1412enum regex_type {
1413 MATCH_FULL = 0,
1414 MATCH_FRONT_ONLY,
1415 MATCH_MIDDLE_ONLY,
1416 MATCH_END_ONLY,
1417 MATCH_GLOB,
1418 MATCH_INDEX,
1419};
1420
1421struct regex {
1422 char pattern[MAX_FILTER_STR_VAL];
1423 int len;
1424 int field_len;
1425 regex_match_func match;
1426};
1427
1428struct filter_pred {
1429 filter_pred_fn_t fn;
1430 u64 val;
1431 struct regex regex;
1432 unsigned short *ops;
1433 struct ftrace_event_field *field;
1434 int offset;
1435 int not;
1436 int op;
1437};
1438
1439static inline bool is_string_field(struct ftrace_event_field *field)
1440{
1441 return field->filter_type == FILTER_DYN_STRING ||
1442 field->filter_type == FILTER_STATIC_STRING ||
1443 field->filter_type == FILTER_PTR_STRING ||
1444 field->filter_type == FILTER_COMM;
1445}
1446
1447static inline bool is_function_field(struct ftrace_event_field *field)
1448{
1449 return field->filter_type == FILTER_TRACE_FN;
1450}
1451
1452extern enum regex_type
1453filter_parse_regex(char *buff, int len, char **search, int *not);
1454extern void print_event_filter(struct trace_event_file *file,
1455 struct trace_seq *s);
1456extern int apply_event_filter(struct trace_event_file *file,
1457 char *filter_string);
1458extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1459 char *filter_string);
1460extern void print_subsystem_event_filter(struct event_subsystem *system,
1461 struct trace_seq *s);
1462extern int filter_assign_type(const char *type);
1463extern int create_event_filter(struct trace_array *tr,
1464 struct trace_event_call *call,
1465 char *filter_str, bool set_str,
1466 struct event_filter **filterp);
1467extern void free_event_filter(struct event_filter *filter);
1468
1469struct ftrace_event_field *
1470trace_find_event_field(struct trace_event_call *call, char *name);
1471
1472extern void trace_event_enable_cmd_record(bool enable);
1473extern void trace_event_enable_tgid_record(bool enable);
1474
1475extern int event_trace_init(void);
1476extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1477extern int event_trace_del_tracer(struct trace_array *tr);
1478extern void __trace_early_add_events(struct trace_array *tr);
1479
1480extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1481 const char *system,
1482 const char *event);
1483extern struct trace_event_file *find_event_file(struct trace_array *tr,
1484 const char *system,
1485 const char *event);
1486
1487static inline void *event_file_data(struct file *filp)
1488{
1489 return READ_ONCE(file_inode(filp)->i_private);
1490}
1491
1492extern struct mutex event_mutex;
1493extern struct list_head ftrace_events;
1494
1495extern const struct file_operations event_trigger_fops;
1496extern const struct file_operations event_hist_fops;
1497extern const struct file_operations event_hist_debug_fops;
1498extern const struct file_operations event_inject_fops;
1499
1500#ifdef CONFIG_HIST_TRIGGERS
1501extern int register_trigger_hist_cmd(void);
1502extern int register_trigger_hist_enable_disable_cmds(void);
1503#else
1504static inline int register_trigger_hist_cmd(void) { return 0; }
1505static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1506#endif
1507
1508extern int register_trigger_cmds(void);
1509extern void clear_event_triggers(struct trace_array *tr);
1510
1511struct event_trigger_data {
1512 unsigned long count;
1513 int ref;
1514 struct event_trigger_ops *ops;
1515 struct event_command *cmd_ops;
1516 struct event_filter __rcu *filter;
1517 char *filter_str;
1518 void *private_data;
1519 bool paused;
1520 bool paused_tmp;
1521 struct list_head list;
1522 char *name;
1523 struct list_head named_list;
1524 struct event_trigger_data *named_data;
1525};
1526
1527/* Avoid typos */
1528#define ENABLE_EVENT_STR "enable_event"
1529#define DISABLE_EVENT_STR "disable_event"
1530#define ENABLE_HIST_STR "enable_hist"
1531#define DISABLE_HIST_STR "disable_hist"
1532
1533struct enable_trigger_data {
1534 struct trace_event_file *file;
1535 bool enable;
1536 bool hist;
1537};
1538
1539extern int event_enable_trigger_print(struct seq_file *m,
1540 struct event_trigger_ops *ops,
1541 struct event_trigger_data *data);
1542extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1543 struct event_trigger_data *data);
1544extern int event_enable_trigger_func(struct event_command *cmd_ops,
1545 struct trace_event_file *file,
1546 char *glob, char *cmd, char *param);
1547extern int event_enable_register_trigger(char *glob,
1548 struct event_trigger_ops *ops,
1549 struct event_trigger_data *data,
1550 struct trace_event_file *file);
1551extern void event_enable_unregister_trigger(char *glob,
1552 struct event_trigger_ops *ops,
1553 struct event_trigger_data *test,
1554 struct trace_event_file *file);
1555extern void trigger_data_free(struct event_trigger_data *data);
1556extern int event_trigger_init(struct event_trigger_ops *ops,
1557 struct event_trigger_data *data);
1558extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1559 int trigger_enable);
1560extern void update_cond_flag(struct trace_event_file *file);
1561extern int set_trigger_filter(char *filter_str,
1562 struct event_trigger_data *trigger_data,
1563 struct trace_event_file *file);
1564extern struct event_trigger_data *find_named_trigger(const char *name);
1565extern bool is_named_trigger(struct event_trigger_data *test);
1566extern int save_named_trigger(const char *name,
1567 struct event_trigger_data *data);
1568extern void del_named_trigger(struct event_trigger_data *data);
1569extern void pause_named_trigger(struct event_trigger_data *data);
1570extern void unpause_named_trigger(struct event_trigger_data *data);
1571extern void set_named_trigger_data(struct event_trigger_data *data,
1572 struct event_trigger_data *named_data);
1573extern struct event_trigger_data *
1574get_named_trigger_data(struct event_trigger_data *data);
1575extern int register_event_command(struct event_command *cmd);
1576extern int unregister_event_command(struct event_command *cmd);
1577extern int register_trigger_hist_enable_disable_cmds(void);
1578
1579/**
1580 * struct event_trigger_ops - callbacks for trace event triggers
1581 *
1582 * The methods in this structure provide per-event trigger hooks for
1583 * various trigger operations.
1584 *
1585 * All the methods below, except for @init() and @free(), must be
1586 * implemented.
1587 *
1588 * @func: The trigger 'probe' function called when the triggering
1589 * event occurs. The data passed into this callback is the data
1590 * that was supplied to the event_command @reg() function that
1591 * registered the trigger (see struct event_command) along with
1592 * the trace record, rec.
1593 *
1594 * @init: An optional initialization function called for the trigger
1595 * when the trigger is registered (via the event_command reg()
1596 * function). This can be used to perform per-trigger
1597 * initialization such as incrementing a per-trigger reference
1598 * count, for instance. This is usually implemented by the
1599 * generic utility function @event_trigger_init() (see
1600 * trace_event_triggers.c).
1601 *
1602 * @free: An optional de-initialization function called for the
1603 * trigger when the trigger is unregistered (via the
1604 * event_command @reg() function). This can be used to perform
1605 * per-trigger de-initialization such as decrementing a
1606 * per-trigger reference count and freeing corresponding trigger
1607 * data, for instance. This is usually implemented by the
1608 * generic utility function @event_trigger_free() (see
1609 * trace_event_triggers.c).
1610 *
1611 * @print: The callback function invoked to have the trigger print
1612 * itself. This is usually implemented by a wrapper function
1613 * that calls the generic utility function @event_trigger_print()
1614 * (see trace_event_triggers.c).
1615 */
1616struct event_trigger_ops {
1617 void (*func)(struct event_trigger_data *data,
1618 struct trace_buffer *buffer, void *rec,
1619 struct ring_buffer_event *rbe);
1620 int (*init)(struct event_trigger_ops *ops,
1621 struct event_trigger_data *data);
1622 void (*free)(struct event_trigger_ops *ops,
1623 struct event_trigger_data *data);
1624 int (*print)(struct seq_file *m,
1625 struct event_trigger_ops *ops,
1626 struct event_trigger_data *data);
1627};
1628
1629/**
1630 * struct event_command - callbacks and data members for event commands
1631 *
1632 * Event commands are invoked by users by writing the command name
1633 * into the 'trigger' file associated with a trace event. The
1634 * parameters associated with a specific invocation of an event
1635 * command are used to create an event trigger instance, which is
1636 * added to the list of trigger instances associated with that trace
1637 * event. When the event is hit, the set of triggers associated with
1638 * that event is invoked.
1639 *
1640 * The data members in this structure provide per-event command data
1641 * for various event commands.
1642 *
1643 * All the data members below, except for @post_trigger, must be set
1644 * for each event command.
1645 *
1646 * @name: The unique name that identifies the event command. This is
1647 * the name used when setting triggers via trigger files.
1648 *
1649 * @trigger_type: A unique id that identifies the event command
1650 * 'type'. This value has two purposes, the first to ensure that
1651 * only one trigger of the same type can be set at a given time
1652 * for a particular event e.g. it doesn't make sense to have both
1653 * a traceon and traceoff trigger attached to a single event at
1654 * the same time, so traceon and traceoff have the same type
1655 * though they have different names. The @trigger_type value is
1656 * also used as a bit value for deferring the actual trigger
1657 * action until after the current event is finished. Some
1658 * commands need to do this if they themselves log to the trace
1659 * buffer (see the @post_trigger() member below). @trigger_type
1660 * values are defined by adding new values to the trigger_type
1661 * enum in include/linux/trace_events.h.
1662 *
1663 * @flags: See the enum event_command_flags below.
1664 *
1665 * All the methods below, except for @set_filter() and @unreg_all(),
1666 * must be implemented.
1667 *
1668 * @func: The callback function responsible for parsing and
1669 * registering the trigger written to the 'trigger' file by the
1670 * user. It allocates the trigger instance and registers it with
1671 * the appropriate trace event. It makes use of the other
1672 * event_command callback functions to orchestrate this, and is
1673 * usually implemented by the generic utility function
1674 * @event_trigger_callback() (see trace_event_triggers.c).
1675 *
1676 * @reg: Adds the trigger to the list of triggers associated with the
1677 * event, and enables the event trigger itself, after
1678 * initializing it (via the event_trigger_ops @init() function).
1679 * This is also where commands can use the @trigger_type value to
1680 * make the decision as to whether or not multiple instances of
1681 * the trigger should be allowed. This is usually implemented by
1682 * the generic utility function @register_trigger() (see
1683 * trace_event_triggers.c).
1684 *
1685 * @unreg: Removes the trigger from the list of triggers associated
1686 * with the event, and disables the event trigger itself, after
1687 * initializing it (via the event_trigger_ops @free() function).
1688 * This is usually implemented by the generic utility function
1689 * @unregister_trigger() (see trace_event_triggers.c).
1690 *
1691 * @unreg_all: An optional function called to remove all the triggers
1692 * from the list of triggers associated with the event. Called
1693 * when a trigger file is opened in truncate mode.
1694 *
1695 * @set_filter: An optional function called to parse and set a filter
1696 * for the trigger. If no @set_filter() method is set for the
1697 * event command, filters set by the user for the command will be
1698 * ignored. This is usually implemented by the generic utility
1699 * function @set_trigger_filter() (see trace_event_triggers.c).
1700 *
1701 * @get_trigger_ops: The callback function invoked to retrieve the
1702 * event_trigger_ops implementation associated with the command.
1703 */
1704struct event_command {
1705 struct list_head list;
1706 char *name;
1707 enum event_trigger_type trigger_type;
1708 int flags;
1709 int (*func)(struct event_command *cmd_ops,
1710 struct trace_event_file *file,
1711 char *glob, char *cmd, char *params);
1712 int (*reg)(char *glob,
1713 struct event_trigger_ops *ops,
1714 struct event_trigger_data *data,
1715 struct trace_event_file *file);
1716 void (*unreg)(char *glob,
1717 struct event_trigger_ops *ops,
1718 struct event_trigger_data *data,
1719 struct trace_event_file *file);
1720 void (*unreg_all)(struct trace_event_file *file);
1721 int (*set_filter)(char *filter_str,
1722 struct event_trigger_data *data,
1723 struct trace_event_file *file);
1724 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1725};
1726
1727/**
1728 * enum event_command_flags - flags for struct event_command
1729 *
1730 * @POST_TRIGGER: A flag that says whether or not this command needs
1731 * to have its action delayed until after the current event has
1732 * been closed. Some triggers need to avoid being invoked while
1733 * an event is currently in the process of being logged, since
1734 * the trigger may itself log data into the trace buffer. Thus
1735 * we make sure the current event is committed before invoking
1736 * those triggers. To do that, the trigger invocation is split
1737 * in two - the first part checks the filter using the current
1738 * trace record; if a command has the @post_trigger flag set, it
1739 * sets a bit for itself in the return value, otherwise it
1740 * directly invokes the trigger. Once all commands have been
1741 * either invoked or set their return flag, the current record is
1742 * either committed or discarded. At that point, if any commands
1743 * have deferred their triggers, those commands are finally
1744 * invoked following the close of the current event. In other
1745 * words, if the event_trigger_ops @func() probe implementation
1746 * itself logs to the trace buffer, this flag should be set,
1747 * otherwise it can be left unspecified.
1748 *
1749 * @NEEDS_REC: A flag that says whether or not this command needs
1750 * access to the trace record in order to perform its function,
1751 * regardless of whether or not it has a filter associated with
1752 * it (filters make a trigger require access to the trace record
1753 * but are not always present).
1754 */
1755enum event_command_flags {
1756 EVENT_CMD_FL_POST_TRIGGER = 1,
1757 EVENT_CMD_FL_NEEDS_REC = 2,
1758};
1759
1760static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1761{
1762 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1763}
1764
1765static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1766{
1767 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1768}
1769
1770extern int trace_event_enable_disable(struct trace_event_file *file,
1771 int enable, int soft_disable);
1772extern int tracing_alloc_snapshot(void);
1773extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1774extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1775
1776extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1777extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1778
1779extern const char *__start___trace_bprintk_fmt[];
1780extern const char *__stop___trace_bprintk_fmt[];
1781
1782extern const char *__start___tracepoint_str[];
1783extern const char *__stop___tracepoint_str[];
1784
1785void trace_printk_control(bool enabled);
1786void trace_printk_start_comm(void);
1787int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1788int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1789
1790/* Used from boot time tracer */
1791extern int trace_set_options(struct trace_array *tr, char *option);
1792extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
1793extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
1794 unsigned long size, int cpu_id);
1795extern int tracing_set_cpumask(struct trace_array *tr,
1796 cpumask_var_t tracing_cpumask_new);
1797
1798
1799#define MAX_EVENT_NAME_LEN 64
1800
1801extern ssize_t trace_parse_run_command(struct file *file,
1802 const char __user *buffer, size_t count, loff_t *ppos,
1803 int (*createfn)(const char *));
1804
1805extern unsigned int err_pos(char *cmd, const char *str);
1806extern void tracing_log_err(struct trace_array *tr,
1807 const char *loc, const char *cmd,
1808 const char **errs, u8 type, u8 pos);
1809
1810/*
1811 * Normal trace_printk() and friends allocates special buffers
1812 * to do the manipulation, as well as saves the print formats
1813 * into sections to display. But the trace infrastructure wants
1814 * to use these without the added overhead at the price of being
1815 * a bit slower (used mainly for warnings, where we don't care
1816 * about performance). The internal_trace_puts() is for such
1817 * a purpose.
1818 */
1819#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1820
1821#undef FTRACE_ENTRY
1822#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
1823 extern struct trace_event_call \
1824 __aligned(4) event_##call;
1825#undef FTRACE_ENTRY_DUP
1826#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
1827 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1828#undef FTRACE_ENTRY_PACKED
1829#define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \
1830 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1831
1832#include "trace_entries.h"
1833
1834#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1835int perf_ftrace_event_register(struct trace_event_call *call,
1836 enum trace_reg type, void *data);
1837#else
1838#define perf_ftrace_event_register NULL
1839#endif
1840
1841#ifdef CONFIG_FTRACE_SYSCALLS
1842void init_ftrace_syscalls(void);
1843const char *get_syscall_name(int syscall);
1844#else
1845static inline void init_ftrace_syscalls(void) { }
1846static inline const char *get_syscall_name(int syscall)
1847{
1848 return NULL;
1849}
1850#endif
1851
1852#ifdef CONFIG_EVENT_TRACING
1853void trace_event_init(void);
1854void trace_event_eval_update(struct trace_eval_map **map, int len);
1855/* Used from boot time tracer */
1856extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
1857extern int trigger_process_regex(struct trace_event_file *file, char *buff);
1858#else
1859static inline void __init trace_event_init(void) { }
1860static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1861#endif
1862
1863#ifdef CONFIG_TRACER_SNAPSHOT
1864void tracing_snapshot_instance(struct trace_array *tr);
1865int tracing_alloc_snapshot_instance(struct trace_array *tr);
1866#else
1867static inline void tracing_snapshot_instance(struct trace_array *tr) { }
1868static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1869{
1870 return 0;
1871}
1872#endif
1873
1874#ifdef CONFIG_PREEMPT_TRACER
1875void tracer_preempt_on(unsigned long a0, unsigned long a1);
1876void tracer_preempt_off(unsigned long a0, unsigned long a1);
1877#else
1878static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
1879static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
1880#endif
1881#ifdef CONFIG_IRQSOFF_TRACER
1882void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
1883void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
1884#else
1885static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
1886static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
1887#endif
1888
1889extern struct trace_iterator *tracepoint_print_iter;
1890
1891/*
1892 * Reset the state of the trace_iterator so that it can read consumed data.
1893 * Normally, the trace_iterator is used for reading the data when it is not
1894 * consumed, and must retain state.
1895 */
1896static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1897{
1898 const size_t offset = offsetof(struct trace_iterator, seq);
1899
1900 /*
1901 * Keep gcc from complaining about overwriting more than just one
1902 * member in the structure.
1903 */
1904 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
1905
1906 iter->pos = -1;
1907}
1908
1909/* Check the name is good for event/group/fields */
1910static inline bool is_good_name(const char *name)
1911{
1912 if (!isalpha(*name) && *name != '_')
1913 return false;
1914 while (*++name != '\0') {
1915 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1916 return false;
1917 }
1918 return true;
1919}
1920
1921/*
1922 * This is a generic way to read and write a u64 value from a file in tracefs.
1923 *
1924 * The value is stored on the variable pointed by *val. The value needs
1925 * to be at least *min and at most *max. The write is protected by an
1926 * existing *lock.
1927 */
1928struct trace_min_max_param {
1929 struct mutex *lock;
1930 u64 *val;
1931 u64 *min;
1932 u64 *max;
1933};
1934
1935#define U64_STR_SIZE 24 /* 20 digits max */
1936
1937extern const struct file_operations trace_min_max_fops;
1938
1939#endif /* _LINUX_KERNEL_TRACE_H */