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