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