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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
19#ifdef CONFIG_FTRACE_SYSCALLS
20#include <asm/unistd.h> /* For NR_SYSCALLS */
21#include <asm/syscall.h> /* some archs define it here */
22#endif
23
24enum trace_type {
25 __TRACE_FIRST_TYPE = 0,
26
27 TRACE_FN,
28 TRACE_CTX,
29 TRACE_WAKE,
30 TRACE_STACK,
31 TRACE_PRINT,
32 TRACE_BPRINT,
33 TRACE_MMIO_RW,
34 TRACE_MMIO_MAP,
35 TRACE_BRANCH,
36 TRACE_GRAPH_RET,
37 TRACE_GRAPH_ENT,
38 TRACE_USER_STACK,
39 TRACE_BLK,
40 TRACE_BPUTS,
41
42 __TRACE_LAST_TYPE,
43};
44
45
46#undef __field
47#define __field(type, item) type item;
48
49#undef __field_struct
50#define __field_struct(type, item) __field(type, item)
51
52#undef __field_desc
53#define __field_desc(type, container, item)
54
55#undef __array
56#define __array(type, item, size) type item[size];
57
58#undef __array_desc
59#define __array_desc(type, container, item, size)
60
61#undef __dynamic_array
62#define __dynamic_array(type, item) type item[];
63
64#undef F_STRUCT
65#define F_STRUCT(args...) args
66
67#undef FTRACE_ENTRY
68#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
69 struct struct_name { \
70 struct trace_entry ent; \
71 tstruct \
72 }
73
74#undef FTRACE_ENTRY_DUP
75#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
76
77#undef FTRACE_ENTRY_REG
78#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
79 filter, regfn) \
80 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
81 filter)
82
83#include "trace_entries.h"
84
85/*
86 * syscalls are special, and need special handling, this is why
87 * they are not included in trace_entries.h
88 */
89struct syscall_trace_enter {
90 struct trace_entry ent;
91 int nr;
92 unsigned long args[];
93};
94
95struct syscall_trace_exit {
96 struct trace_entry ent;
97 int nr;
98 long ret;
99};
100
101struct kprobe_trace_entry_head {
102 struct trace_entry ent;
103 unsigned long ip;
104};
105
106struct kretprobe_trace_entry_head {
107 struct trace_entry ent;
108 unsigned long func;
109 unsigned long ret_ip;
110};
111
112/*
113 * trace_flag_type is an enumeration that holds different
114 * states when a trace occurs. These are:
115 * IRQS_OFF - interrupts were disabled
116 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
117 * NEED_RESCHED - reschedule is requested
118 * HARDIRQ - inside an interrupt handler
119 * SOFTIRQ - inside a softirq handler
120 */
121enum trace_flag_type {
122 TRACE_FLAG_IRQS_OFF = 0x01,
123 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
124 TRACE_FLAG_NEED_RESCHED = 0x04,
125 TRACE_FLAG_HARDIRQ = 0x08,
126 TRACE_FLAG_SOFTIRQ = 0x10,
127 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
128 TRACE_FLAG_NMI = 0x40,
129};
130
131#define TRACE_BUF_SIZE 1024
132
133struct trace_array;
134
135/*
136 * The CPU trace array - it consists of thousands of trace entries
137 * plus some other descriptor data: (for example which task started
138 * the trace, etc.)
139 */
140struct trace_array_cpu {
141 atomic_t disabled;
142 void *buffer_page; /* ring buffer spare */
143
144 unsigned long entries;
145 unsigned long saved_latency;
146 unsigned long critical_start;
147 unsigned long critical_end;
148 unsigned long critical_sequence;
149 unsigned long nice;
150 unsigned long policy;
151 unsigned long rt_priority;
152 unsigned long skipped_entries;
153 cycle_t preempt_timestamp;
154 pid_t pid;
155 kuid_t uid;
156 char comm[TASK_COMM_LEN];
157
158 bool ignore_pid;
159};
160
161struct tracer;
162struct trace_option_dentry;
163
164struct trace_buffer {
165 struct trace_array *tr;
166 struct ring_buffer *buffer;
167 struct trace_array_cpu __percpu *data;
168 cycle_t time_start;
169 int cpu;
170};
171
172#define TRACE_FLAGS_MAX_SIZE 32
173
174struct trace_options {
175 struct tracer *tracer;
176 struct trace_option_dentry *topts;
177};
178
179struct trace_pid_list {
180 unsigned int nr_pids;
181 int order;
182 pid_t *pids;
183};
184
185/*
186 * The trace array - an array of per-CPU trace arrays. This is the
187 * highest level data structure that individual tracers deal with.
188 * They have on/off state as well:
189 */
190struct trace_array {
191 struct list_head list;
192 char *name;
193 struct trace_buffer trace_buffer;
194#ifdef CONFIG_TRACER_MAX_TRACE
195 /*
196 * The max_buffer is used to snapshot the trace when a maximum
197 * latency is reached, or when the user initiates a snapshot.
198 * Some tracers will use this to store a maximum trace while
199 * it continues examining live traces.
200 *
201 * The buffers for the max_buffer are set up the same as the trace_buffer
202 * When a snapshot is taken, the buffer of the max_buffer is swapped
203 * with the buffer of the trace_buffer and the buffers are reset for
204 * the trace_buffer so the tracing can continue.
205 */
206 struct trace_buffer max_buffer;
207 bool allocated_snapshot;
208 unsigned long max_latency;
209#endif
210 struct trace_pid_list __rcu *filtered_pids;
211 /*
212 * max_lock is used to protect the swapping of buffers
213 * when taking a max snapshot. The buffers themselves are
214 * protected by per_cpu spinlocks. But the action of the swap
215 * needs its own lock.
216 *
217 * This is defined as a arch_spinlock_t in order to help
218 * with performance when lockdep debugging is enabled.
219 *
220 * It is also used in other places outside the update_max_tr
221 * so it needs to be defined outside of the
222 * CONFIG_TRACER_MAX_TRACE.
223 */
224 arch_spinlock_t max_lock;
225 int buffer_disabled;
226#ifdef CONFIG_FTRACE_SYSCALLS
227 int sys_refcount_enter;
228 int sys_refcount_exit;
229 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
230 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
231#endif
232 int stop_count;
233 int clock_id;
234 int nr_topts;
235 struct tracer *current_trace;
236 unsigned int trace_flags;
237 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
238 unsigned int flags;
239 raw_spinlock_t start_lock;
240 struct dentry *dir;
241 struct dentry *options;
242 struct dentry *percpu_dir;
243 struct dentry *event_dir;
244 struct trace_options *topts;
245 struct list_head systems;
246 struct list_head events;
247 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
248 int ref;
249#ifdef CONFIG_FUNCTION_TRACER
250 struct ftrace_ops *ops;
251 /* function tracing enabled */
252 int function_enabled;
253#endif
254};
255
256enum {
257 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
258};
259
260extern struct list_head ftrace_trace_arrays;
261
262extern struct mutex trace_types_lock;
263
264extern int trace_array_get(struct trace_array *tr);
265extern void trace_array_put(struct trace_array *tr);
266
267/*
268 * The global tracer (top) should be the first trace array added,
269 * but we check the flag anyway.
270 */
271static inline struct trace_array *top_trace_array(void)
272{
273 struct trace_array *tr;
274
275 if (list_empty(&ftrace_trace_arrays))
276 return NULL;
277
278 tr = list_entry(ftrace_trace_arrays.prev,
279 typeof(*tr), list);
280 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
281 return tr;
282}
283
284#define FTRACE_CMP_TYPE(var, type) \
285 __builtin_types_compatible_p(typeof(var), type *)
286
287#undef IF_ASSIGN
288#define IF_ASSIGN(var, entry, etype, id) \
289 if (FTRACE_CMP_TYPE(var, etype)) { \
290 var = (typeof(var))(entry); \
291 WARN_ON(id && (entry)->type != id); \
292 break; \
293 }
294
295/* Will cause compile errors if type is not found. */
296extern void __ftrace_bad_type(void);
297
298/*
299 * The trace_assign_type is a verifier that the entry type is
300 * the same as the type being assigned. To add new types simply
301 * add a line with the following format:
302 *
303 * IF_ASSIGN(var, ent, type, id);
304 *
305 * Where "type" is the trace type that includes the trace_entry
306 * as the "ent" item. And "id" is the trace identifier that is
307 * used in the trace_type enum.
308 *
309 * If the type can have more than one id, then use zero.
310 */
311#define trace_assign_type(var, ent) \
312 do { \
313 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
314 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
315 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
316 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
317 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
318 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
319 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
320 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
321 TRACE_MMIO_RW); \
322 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
323 TRACE_MMIO_MAP); \
324 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
325 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
326 TRACE_GRAPH_ENT); \
327 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
328 TRACE_GRAPH_RET); \
329 __ftrace_bad_type(); \
330 } while (0)
331
332/*
333 * An option specific to a tracer. This is a boolean value.
334 * The bit is the bit index that sets its value on the
335 * flags value in struct tracer_flags.
336 */
337struct tracer_opt {
338 const char *name; /* Will appear on the trace_options file */
339 u32 bit; /* Mask assigned in val field in tracer_flags */
340};
341
342/*
343 * The set of specific options for a tracer. Your tracer
344 * have to set the initial value of the flags val.
345 */
346struct tracer_flags {
347 u32 val;
348 struct tracer_opt *opts;
349 struct tracer *trace;
350};
351
352/* Makes more easy to define a tracer opt */
353#define TRACER_OPT(s, b) .name = #s, .bit = b
354
355
356struct trace_option_dentry {
357 struct tracer_opt *opt;
358 struct tracer_flags *flags;
359 struct trace_array *tr;
360 struct dentry *entry;
361};
362
363/**
364 * struct tracer - a specific tracer and its callbacks to interact with tracefs
365 * @name: the name chosen to select it on the available_tracers file
366 * @init: called when one switches to this tracer (echo name > current_tracer)
367 * @reset: called when one switches to another tracer
368 * @start: called when tracing is unpaused (echo 1 > tracing_on)
369 * @stop: called when tracing is paused (echo 0 > tracing_on)
370 * @update_thresh: called when tracing_thresh is updated
371 * @open: called when the trace file is opened
372 * @pipe_open: called when the trace_pipe file is opened
373 * @close: called when the trace file is released
374 * @pipe_close: called when the trace_pipe file is released
375 * @read: override the default read callback on trace_pipe
376 * @splice_read: override the default splice_read callback on trace_pipe
377 * @selftest: selftest to run on boot (see trace_selftest.c)
378 * @print_headers: override the first lines that describe your columns
379 * @print_line: callback that prints a trace
380 * @set_flag: signals one of your private flags changed (trace_options file)
381 * @flags: your private flags
382 */
383struct tracer {
384 const char *name;
385 int (*init)(struct trace_array *tr);
386 void (*reset)(struct trace_array *tr);
387 void (*start)(struct trace_array *tr);
388 void (*stop)(struct trace_array *tr);
389 int (*update_thresh)(struct trace_array *tr);
390 void (*open)(struct trace_iterator *iter);
391 void (*pipe_open)(struct trace_iterator *iter);
392 void (*close)(struct trace_iterator *iter);
393 void (*pipe_close)(struct trace_iterator *iter);
394 ssize_t (*read)(struct trace_iterator *iter,
395 struct file *filp, char __user *ubuf,
396 size_t cnt, loff_t *ppos);
397 ssize_t (*splice_read)(struct trace_iterator *iter,
398 struct file *filp,
399 loff_t *ppos,
400 struct pipe_inode_info *pipe,
401 size_t len,
402 unsigned int flags);
403#ifdef CONFIG_FTRACE_STARTUP_TEST
404 int (*selftest)(struct tracer *trace,
405 struct trace_array *tr);
406#endif
407 void (*print_header)(struct seq_file *m);
408 enum print_line_t (*print_line)(struct trace_iterator *iter);
409 /* If you handled the flag setting, return 0 */
410 int (*set_flag)(struct trace_array *tr,
411 u32 old_flags, u32 bit, int set);
412 /* Return 0 if OK with change, else return non-zero */
413 int (*flag_changed)(struct trace_array *tr,
414 u32 mask, int set);
415 struct tracer *next;
416 struct tracer_flags *flags;
417 int enabled;
418 int ref;
419 bool print_max;
420 bool allow_instances;
421#ifdef CONFIG_TRACER_MAX_TRACE
422 bool use_max_tr;
423#endif
424};
425
426
427/* Only current can touch trace_recursion */
428
429/*
430 * For function tracing recursion:
431 * The order of these bits are important.
432 *
433 * When function tracing occurs, the following steps are made:
434 * If arch does not support a ftrace feature:
435 * call internal function (uses INTERNAL bits) which calls...
436 * If callback is registered to the "global" list, the list
437 * function is called and recursion checks the GLOBAL bits.
438 * then this function calls...
439 * The function callback, which can use the FTRACE bits to
440 * check for recursion.
441 *
442 * Now if the arch does not suppport a feature, and it calls
443 * the global list function which calls the ftrace callback
444 * all three of these steps will do a recursion protection.
445 * There's no reason to do one if the previous caller already
446 * did. The recursion that we are protecting against will
447 * go through the same steps again.
448 *
449 * To prevent the multiple recursion checks, if a recursion
450 * bit is set that is higher than the MAX bit of the current
451 * check, then we know that the check was made by the previous
452 * caller, and we can skip the current check.
453 */
454enum {
455 TRACE_BUFFER_BIT,
456 TRACE_BUFFER_NMI_BIT,
457 TRACE_BUFFER_IRQ_BIT,
458 TRACE_BUFFER_SIRQ_BIT,
459
460 /* Start of function recursion bits */
461 TRACE_FTRACE_BIT,
462 TRACE_FTRACE_NMI_BIT,
463 TRACE_FTRACE_IRQ_BIT,
464 TRACE_FTRACE_SIRQ_BIT,
465
466 /* INTERNAL_BITs must be greater than FTRACE_BITs */
467 TRACE_INTERNAL_BIT,
468 TRACE_INTERNAL_NMI_BIT,
469 TRACE_INTERNAL_IRQ_BIT,
470 TRACE_INTERNAL_SIRQ_BIT,
471
472 TRACE_BRANCH_BIT,
473/*
474 * Abuse of the trace_recursion.
475 * As we need a way to maintain state if we are tracing the function
476 * graph in irq because we want to trace a particular function that
477 * was called in irq context but we have irq tracing off. Since this
478 * can only be modified by current, we can reuse trace_recursion.
479 */
480 TRACE_IRQ_BIT,
481};
482
483#define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
484#define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
485#define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
486
487#define TRACE_CONTEXT_BITS 4
488
489#define TRACE_FTRACE_START TRACE_FTRACE_BIT
490#define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
491
492#define TRACE_LIST_START TRACE_INTERNAL_BIT
493#define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
494
495#define TRACE_CONTEXT_MASK TRACE_LIST_MAX
496
497static __always_inline int trace_get_context_bit(void)
498{
499 int bit;
500
501 if (in_interrupt()) {
502 if (in_nmi())
503 bit = 0;
504
505 else if (in_irq())
506 bit = 1;
507 else
508 bit = 2;
509 } else
510 bit = 3;
511
512 return bit;
513}
514
515static __always_inline int trace_test_and_set_recursion(int start, int max)
516{
517 unsigned int val = current->trace_recursion;
518 int bit;
519
520 /* A previous recursion check was made */
521 if ((val & TRACE_CONTEXT_MASK) > max)
522 return 0;
523
524 bit = trace_get_context_bit() + start;
525 if (unlikely(val & (1 << bit)))
526 return -1;
527
528 val |= 1 << bit;
529 current->trace_recursion = val;
530 barrier();
531
532 return bit;
533}
534
535static __always_inline void trace_clear_recursion(int bit)
536{
537 unsigned int val = current->trace_recursion;
538
539 if (!bit)
540 return;
541
542 bit = 1 << bit;
543 val &= ~bit;
544
545 barrier();
546 current->trace_recursion = val;
547}
548
549static inline struct ring_buffer_iter *
550trace_buffer_iter(struct trace_iterator *iter, int cpu)
551{
552 if (iter->buffer_iter && iter->buffer_iter[cpu])
553 return iter->buffer_iter[cpu];
554 return NULL;
555}
556
557int tracer_init(struct tracer *t, struct trace_array *tr);
558int tracing_is_enabled(void);
559void tracing_reset(struct trace_buffer *buf, int cpu);
560void tracing_reset_online_cpus(struct trace_buffer *buf);
561void tracing_reset_current(int cpu);
562void tracing_reset_all_online_cpus(void);
563int tracing_open_generic(struct inode *inode, struct file *filp);
564bool tracing_is_disabled(void);
565struct dentry *trace_create_file(const char *name,
566 umode_t mode,
567 struct dentry *parent,
568 void *data,
569 const struct file_operations *fops);
570
571struct dentry *tracing_init_dentry(void);
572
573struct ring_buffer_event;
574
575struct ring_buffer_event *
576trace_buffer_lock_reserve(struct ring_buffer *buffer,
577 int type,
578 unsigned long len,
579 unsigned long flags,
580 int pc);
581
582struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
583 struct trace_array_cpu *data);
584
585struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
586 int *ent_cpu, u64 *ent_ts);
587
588void __buffer_unlock_commit(struct ring_buffer *buffer,
589 struct ring_buffer_event *event);
590
591int trace_empty(struct trace_iterator *iter);
592
593void *trace_find_next_entry_inc(struct trace_iterator *iter);
594
595void trace_init_global_iter(struct trace_iterator *iter);
596
597void tracing_iter_reset(struct trace_iterator *iter, int cpu);
598
599void trace_function(struct trace_array *tr,
600 unsigned long ip,
601 unsigned long parent_ip,
602 unsigned long flags, int pc);
603void trace_graph_function(struct trace_array *tr,
604 unsigned long ip,
605 unsigned long parent_ip,
606 unsigned long flags, int pc);
607void trace_latency_header(struct seq_file *m);
608void trace_default_header(struct seq_file *m);
609void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
610int trace_empty(struct trace_iterator *iter);
611
612void trace_graph_return(struct ftrace_graph_ret *trace);
613int trace_graph_entry(struct ftrace_graph_ent *trace);
614void set_graph_array(struct trace_array *tr);
615
616void tracing_start_cmdline_record(void);
617void tracing_stop_cmdline_record(void);
618int register_tracer(struct tracer *type);
619int is_tracing_stopped(void);
620
621loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
622
623extern cpumask_var_t __read_mostly tracing_buffer_mask;
624
625#define for_each_tracing_cpu(cpu) \
626 for_each_cpu(cpu, tracing_buffer_mask)
627
628extern unsigned long nsecs_to_usecs(unsigned long nsecs);
629
630extern unsigned long tracing_thresh;
631
632#ifdef CONFIG_TRACER_MAX_TRACE
633void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
634void update_max_tr_single(struct trace_array *tr,
635 struct task_struct *tsk, int cpu);
636#endif /* CONFIG_TRACER_MAX_TRACE */
637
638#ifdef CONFIG_STACKTRACE
639void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
640 int pc);
641
642void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
643 int pc);
644#else
645static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
646 unsigned long flags, int pc)
647{
648}
649
650static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
651 int skip, int pc)
652{
653}
654#endif /* CONFIG_STACKTRACE */
655
656extern cycle_t ftrace_now(int cpu);
657
658extern void trace_find_cmdline(int pid, char comm[]);
659
660#ifdef CONFIG_DYNAMIC_FTRACE
661extern unsigned long ftrace_update_tot_cnt;
662#endif
663#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
664extern int DYN_FTRACE_TEST_NAME(void);
665#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
666extern int DYN_FTRACE_TEST_NAME2(void);
667
668extern bool ring_buffer_expanded;
669extern bool tracing_selftest_disabled;
670
671#ifdef CONFIG_FTRACE_STARTUP_TEST
672extern int trace_selftest_startup_function(struct tracer *trace,
673 struct trace_array *tr);
674extern int trace_selftest_startup_function_graph(struct tracer *trace,
675 struct trace_array *tr);
676extern int trace_selftest_startup_irqsoff(struct tracer *trace,
677 struct trace_array *tr);
678extern int trace_selftest_startup_preemptoff(struct tracer *trace,
679 struct trace_array *tr);
680extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
681 struct trace_array *tr);
682extern int trace_selftest_startup_wakeup(struct tracer *trace,
683 struct trace_array *tr);
684extern int trace_selftest_startup_nop(struct tracer *trace,
685 struct trace_array *tr);
686extern int trace_selftest_startup_sched_switch(struct tracer *trace,
687 struct trace_array *tr);
688extern int trace_selftest_startup_branch(struct tracer *trace,
689 struct trace_array *tr);
690/*
691 * Tracer data references selftest functions that only occur
692 * on boot up. These can be __init functions. Thus, when selftests
693 * are enabled, then the tracers need to reference __init functions.
694 */
695#define __tracer_data __refdata
696#else
697/* Tracers are seldom changed. Optimize when selftests are disabled. */
698#define __tracer_data __read_mostly
699#endif /* CONFIG_FTRACE_STARTUP_TEST */
700
701extern void *head_page(struct trace_array_cpu *data);
702extern unsigned long long ns2usecs(cycle_t nsec);
703extern int
704trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
705extern int
706trace_vprintk(unsigned long ip, const char *fmt, va_list args);
707extern int
708trace_array_vprintk(struct trace_array *tr,
709 unsigned long ip, const char *fmt, va_list args);
710int trace_array_printk(struct trace_array *tr,
711 unsigned long ip, const char *fmt, ...);
712int trace_array_printk_buf(struct ring_buffer *buffer,
713 unsigned long ip, const char *fmt, ...);
714void trace_printk_seq(struct trace_seq *s);
715enum print_line_t print_trace_line(struct trace_iterator *iter);
716
717extern char trace_find_mark(unsigned long long duration);
718
719/* Standard output formatting function used for function return traces */
720#ifdef CONFIG_FUNCTION_GRAPH_TRACER
721
722/* Flag options */
723#define TRACE_GRAPH_PRINT_OVERRUN 0x1
724#define TRACE_GRAPH_PRINT_CPU 0x2
725#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
726#define TRACE_GRAPH_PRINT_PROC 0x8
727#define TRACE_GRAPH_PRINT_DURATION 0x10
728#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
729#define TRACE_GRAPH_PRINT_IRQS 0x40
730#define TRACE_GRAPH_PRINT_TAIL 0x80
731#define TRACE_GRAPH_SLEEP_TIME 0x100
732#define TRACE_GRAPH_GRAPH_TIME 0x200
733#define TRACE_GRAPH_PRINT_FILL_SHIFT 28
734#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
735
736extern void ftrace_graph_sleep_time_control(bool enable);
737extern void ftrace_graph_graph_time_control(bool enable);
738
739extern enum print_line_t
740print_graph_function_flags(struct trace_iterator *iter, u32 flags);
741extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
742extern void
743trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
744extern void graph_trace_open(struct trace_iterator *iter);
745extern void graph_trace_close(struct trace_iterator *iter);
746extern int __trace_graph_entry(struct trace_array *tr,
747 struct ftrace_graph_ent *trace,
748 unsigned long flags, int pc);
749extern void __trace_graph_return(struct trace_array *tr,
750 struct ftrace_graph_ret *trace,
751 unsigned long flags, int pc);
752
753
754#ifdef CONFIG_DYNAMIC_FTRACE
755/* TODO: make this variable */
756#define FTRACE_GRAPH_MAX_FUNCS 32
757extern int ftrace_graph_count;
758extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
759extern int ftrace_graph_notrace_count;
760extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS];
761
762static inline int ftrace_graph_addr(unsigned long addr)
763{
764 int i;
765
766 if (!ftrace_graph_count)
767 return 1;
768
769 for (i = 0; i < ftrace_graph_count; i++) {
770 if (addr == ftrace_graph_funcs[i]) {
771 /*
772 * If no irqs are to be traced, but a set_graph_function
773 * is set, and called by an interrupt handler, we still
774 * want to trace it.
775 */
776 if (in_irq())
777 trace_recursion_set(TRACE_IRQ_BIT);
778 else
779 trace_recursion_clear(TRACE_IRQ_BIT);
780 return 1;
781 }
782 }
783
784 return 0;
785}
786
787static inline int ftrace_graph_notrace_addr(unsigned long addr)
788{
789 int i;
790
791 if (!ftrace_graph_notrace_count)
792 return 0;
793
794 for (i = 0; i < ftrace_graph_notrace_count; i++) {
795 if (addr == ftrace_graph_notrace_funcs[i])
796 return 1;
797 }
798
799 return 0;
800}
801#else
802static inline int ftrace_graph_addr(unsigned long addr)
803{
804 return 1;
805}
806
807static inline int ftrace_graph_notrace_addr(unsigned long addr)
808{
809 return 0;
810}
811#endif /* CONFIG_DYNAMIC_FTRACE */
812#else /* CONFIG_FUNCTION_GRAPH_TRACER */
813static inline enum print_line_t
814print_graph_function_flags(struct trace_iterator *iter, u32 flags)
815{
816 return TRACE_TYPE_UNHANDLED;
817}
818#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
819
820extern struct list_head ftrace_pids;
821
822#ifdef CONFIG_FUNCTION_TRACER
823extern bool ftrace_filter_param __initdata;
824static inline int ftrace_trace_task(struct task_struct *task)
825{
826 if (list_empty(&ftrace_pids))
827 return 1;
828
829 return test_tsk_trace_trace(task);
830}
831extern int ftrace_is_dead(void);
832int ftrace_create_function_files(struct trace_array *tr,
833 struct dentry *parent);
834void ftrace_destroy_function_files(struct trace_array *tr);
835void ftrace_init_global_array_ops(struct trace_array *tr);
836void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
837void ftrace_reset_array_ops(struct trace_array *tr);
838int using_ftrace_ops_list_func(void);
839#else
840static inline int ftrace_trace_task(struct task_struct *task)
841{
842 return 1;
843}
844static inline int ftrace_is_dead(void) { return 0; }
845static inline int
846ftrace_create_function_files(struct trace_array *tr,
847 struct dentry *parent)
848{
849 return 0;
850}
851static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
852static inline __init void
853ftrace_init_global_array_ops(struct trace_array *tr) { }
854static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
855/* ftace_func_t type is not defined, use macro instead of static inline */
856#define ftrace_init_array_ops(tr, func) do { } while (0)
857#endif /* CONFIG_FUNCTION_TRACER */
858
859#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
860void ftrace_create_filter_files(struct ftrace_ops *ops,
861 struct dentry *parent);
862void ftrace_destroy_filter_files(struct ftrace_ops *ops);
863#else
864/*
865 * The ops parameter passed in is usually undefined.
866 * This must be a macro.
867 */
868#define ftrace_create_filter_files(ops, parent) do { } while (0)
869#define ftrace_destroy_filter_files(ops) do { } while (0)
870#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
871
872bool ftrace_event_is_function(struct trace_event_call *call);
873
874/*
875 * struct trace_parser - servers for reading the user input separated by spaces
876 * @cont: set if the input is not complete - no final space char was found
877 * @buffer: holds the parsed user input
878 * @idx: user input length
879 * @size: buffer size
880 */
881struct trace_parser {
882 bool cont;
883 char *buffer;
884 unsigned idx;
885 unsigned size;
886};
887
888static inline bool trace_parser_loaded(struct trace_parser *parser)
889{
890 return (parser->idx != 0);
891}
892
893static inline bool trace_parser_cont(struct trace_parser *parser)
894{
895 return parser->cont;
896}
897
898static inline void trace_parser_clear(struct trace_parser *parser)
899{
900 parser->cont = false;
901 parser->idx = 0;
902}
903
904extern int trace_parser_get_init(struct trace_parser *parser, int size);
905extern void trace_parser_put(struct trace_parser *parser);
906extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
907 size_t cnt, loff_t *ppos);
908
909/*
910 * Only create function graph options if function graph is configured.
911 */
912#ifdef CONFIG_FUNCTION_GRAPH_TRACER
913# define FGRAPH_FLAGS \
914 C(DISPLAY_GRAPH, "display-graph"),
915#else
916# define FGRAPH_FLAGS
917#endif
918
919#ifdef CONFIG_BRANCH_TRACER
920# define BRANCH_FLAGS \
921 C(BRANCH, "branch"),
922#else
923# define BRANCH_FLAGS
924#endif
925
926#ifdef CONFIG_FUNCTION_TRACER
927# define FUNCTION_FLAGS \
928 C(FUNCTION, "function-trace"),
929# define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
930#else
931# define FUNCTION_FLAGS
932# define FUNCTION_DEFAULT_FLAGS 0UL
933#endif
934
935#ifdef CONFIG_STACKTRACE
936# define STACK_FLAGS \
937 C(STACKTRACE, "stacktrace"),
938#else
939# define STACK_FLAGS
940#endif
941
942/*
943 * trace_iterator_flags is an enumeration that defines bit
944 * positions into trace_flags that controls the output.
945 *
946 * NOTE: These bits must match the trace_options array in
947 * trace.c (this macro guarantees it).
948 */
949#define TRACE_FLAGS \
950 C(PRINT_PARENT, "print-parent"), \
951 C(SYM_OFFSET, "sym-offset"), \
952 C(SYM_ADDR, "sym-addr"), \
953 C(VERBOSE, "verbose"), \
954 C(RAW, "raw"), \
955 C(HEX, "hex"), \
956 C(BIN, "bin"), \
957 C(BLOCK, "block"), \
958 C(PRINTK, "trace_printk"), \
959 C(ANNOTATE, "annotate"), \
960 C(USERSTACKTRACE, "userstacktrace"), \
961 C(SYM_USEROBJ, "sym-userobj"), \
962 C(PRINTK_MSGONLY, "printk-msg-only"), \
963 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
964 C(LATENCY_FMT, "latency-format"), \
965 C(RECORD_CMD, "record-cmd"), \
966 C(OVERWRITE, "overwrite"), \
967 C(STOP_ON_FREE, "disable_on_free"), \
968 C(IRQ_INFO, "irq-info"), \
969 C(MARKERS, "markers"), \
970 FUNCTION_FLAGS \
971 FGRAPH_FLAGS \
972 STACK_FLAGS \
973 BRANCH_FLAGS
974
975/*
976 * By defining C, we can make TRACE_FLAGS a list of bit names
977 * that will define the bits for the flag masks.
978 */
979#undef C
980#define C(a, b) TRACE_ITER_##a##_BIT
981
982enum trace_iterator_bits {
983 TRACE_FLAGS
984 /* Make sure we don't go more than we have bits for */
985 TRACE_ITER_LAST_BIT
986};
987
988/*
989 * By redefining C, we can make TRACE_FLAGS a list of masks that
990 * use the bits as defined above.
991 */
992#undef C
993#define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
994
995enum trace_iterator_flags { TRACE_FLAGS };
996
997/*
998 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
999 * control the output of kernel symbols.
1000 */
1001#define TRACE_ITER_SYM_MASK \
1002 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1003
1004extern struct tracer nop_trace;
1005
1006#ifdef CONFIG_BRANCH_TRACER
1007extern int enable_branch_tracing(struct trace_array *tr);
1008extern void disable_branch_tracing(void);
1009static inline int trace_branch_enable(struct trace_array *tr)
1010{
1011 if (tr->trace_flags & TRACE_ITER_BRANCH)
1012 return enable_branch_tracing(tr);
1013 return 0;
1014}
1015static inline void trace_branch_disable(void)
1016{
1017 /* due to races, always disable */
1018 disable_branch_tracing();
1019}
1020#else
1021static inline int trace_branch_enable(struct trace_array *tr)
1022{
1023 return 0;
1024}
1025static inline void trace_branch_disable(void)
1026{
1027}
1028#endif /* CONFIG_BRANCH_TRACER */
1029
1030/* set ring buffers to default size if not already done so */
1031int tracing_update_buffers(void);
1032
1033struct ftrace_event_field {
1034 struct list_head link;
1035 const char *name;
1036 const char *type;
1037 int filter_type;
1038 int offset;
1039 int size;
1040 int is_signed;
1041};
1042
1043struct event_filter {
1044 int n_preds; /* Number assigned */
1045 int a_preds; /* allocated */
1046 struct filter_pred *preds;
1047 struct filter_pred *root;
1048 char *filter_string;
1049};
1050
1051struct event_subsystem {
1052 struct list_head list;
1053 const char *name;
1054 struct event_filter *filter;
1055 int ref_count;
1056};
1057
1058struct trace_subsystem_dir {
1059 struct list_head list;
1060 struct event_subsystem *subsystem;
1061 struct trace_array *tr;
1062 struct dentry *entry;
1063 int ref_count;
1064 int nr_events;
1065};
1066
1067#define FILTER_PRED_INVALID ((unsigned short)-1)
1068#define FILTER_PRED_IS_RIGHT (1 << 15)
1069#define FILTER_PRED_FOLD (1 << 15)
1070
1071/*
1072 * The max preds is the size of unsigned short with
1073 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1074 * and FOLD flags. The other is reserved.
1075 *
1076 * 2^14 preds is way more than enough.
1077 */
1078#define MAX_FILTER_PRED 16384
1079
1080struct filter_pred;
1081struct regex;
1082
1083typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1084
1085typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1086
1087enum regex_type {
1088 MATCH_FULL = 0,
1089 MATCH_FRONT_ONLY,
1090 MATCH_MIDDLE_ONLY,
1091 MATCH_END_ONLY,
1092};
1093
1094struct regex {
1095 char pattern[MAX_FILTER_STR_VAL];
1096 int len;
1097 int field_len;
1098 regex_match_func match;
1099};
1100
1101struct filter_pred {
1102 filter_pred_fn_t fn;
1103 u64 val;
1104 struct regex regex;
1105 unsigned short *ops;
1106 struct ftrace_event_field *field;
1107 int offset;
1108 int not;
1109 int op;
1110 unsigned short index;
1111 unsigned short parent;
1112 unsigned short left;
1113 unsigned short right;
1114};
1115
1116static inline bool is_string_field(struct ftrace_event_field *field)
1117{
1118 return field->filter_type == FILTER_DYN_STRING ||
1119 field->filter_type == FILTER_STATIC_STRING ||
1120 field->filter_type == FILTER_PTR_STRING;
1121}
1122
1123static inline bool is_function_field(struct ftrace_event_field *field)
1124{
1125 return field->filter_type == FILTER_TRACE_FN;
1126}
1127
1128extern enum regex_type
1129filter_parse_regex(char *buff, int len, char **search, int *not);
1130extern void print_event_filter(struct trace_event_file *file,
1131 struct trace_seq *s);
1132extern int apply_event_filter(struct trace_event_file *file,
1133 char *filter_string);
1134extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1135 char *filter_string);
1136extern void print_subsystem_event_filter(struct event_subsystem *system,
1137 struct trace_seq *s);
1138extern int filter_assign_type(const char *type);
1139extern int create_event_filter(struct trace_event_call *call,
1140 char *filter_str, bool set_str,
1141 struct event_filter **filterp);
1142extern void free_event_filter(struct event_filter *filter);
1143
1144struct ftrace_event_field *
1145trace_find_event_field(struct trace_event_call *call, char *name);
1146
1147extern void trace_event_enable_cmd_record(bool enable);
1148extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1149extern int event_trace_del_tracer(struct trace_array *tr);
1150
1151extern struct trace_event_file *find_event_file(struct trace_array *tr,
1152 const char *system,
1153 const char *event);
1154
1155static inline void *event_file_data(struct file *filp)
1156{
1157 return ACCESS_ONCE(file_inode(filp)->i_private);
1158}
1159
1160extern struct mutex event_mutex;
1161extern struct list_head ftrace_events;
1162
1163extern const struct file_operations event_trigger_fops;
1164
1165extern int register_trigger_cmds(void);
1166extern void clear_event_triggers(struct trace_array *tr);
1167
1168struct event_trigger_data {
1169 unsigned long count;
1170 int ref;
1171 struct event_trigger_ops *ops;
1172 struct event_command *cmd_ops;
1173 struct event_filter __rcu *filter;
1174 char *filter_str;
1175 void *private_data;
1176 bool paused;
1177 struct list_head list;
1178};
1179
1180extern void trigger_data_free(struct event_trigger_data *data);
1181extern int event_trigger_init(struct event_trigger_ops *ops,
1182 struct event_trigger_data *data);
1183extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1184 int trigger_enable);
1185extern void update_cond_flag(struct trace_event_file *file);
1186extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
1187 struct event_trigger_data *test,
1188 struct trace_event_file *file);
1189extern int set_trigger_filter(char *filter_str,
1190 struct event_trigger_data *trigger_data,
1191 struct trace_event_file *file);
1192extern int register_event_command(struct event_command *cmd);
1193
1194/**
1195 * struct event_trigger_ops - callbacks for trace event triggers
1196 *
1197 * The methods in this structure provide per-event trigger hooks for
1198 * various trigger operations.
1199 *
1200 * All the methods below, except for @init() and @free(), must be
1201 * implemented.
1202 *
1203 * @func: The trigger 'probe' function called when the triggering
1204 * event occurs. The data passed into this callback is the data
1205 * that was supplied to the event_command @reg() function that
1206 * registered the trigger (see struct event_command) along with
1207 * the trace record, rec.
1208 *
1209 * @init: An optional initialization function called for the trigger
1210 * when the trigger is registered (via the event_command reg()
1211 * function). This can be used to perform per-trigger
1212 * initialization such as incrementing a per-trigger reference
1213 * count, for instance. This is usually implemented by the
1214 * generic utility function @event_trigger_init() (see
1215 * trace_event_triggers.c).
1216 *
1217 * @free: An optional de-initialization function called for the
1218 * trigger when the trigger is unregistered (via the
1219 * event_command @reg() function). This can be used to perform
1220 * per-trigger de-initialization such as decrementing a
1221 * per-trigger reference count and freeing corresponding trigger
1222 * data, for instance. This is usually implemented by the
1223 * generic utility function @event_trigger_free() (see
1224 * trace_event_triggers.c).
1225 *
1226 * @print: The callback function invoked to have the trigger print
1227 * itself. This is usually implemented by a wrapper function
1228 * that calls the generic utility function @event_trigger_print()
1229 * (see trace_event_triggers.c).
1230 */
1231struct event_trigger_ops {
1232 void (*func)(struct event_trigger_data *data,
1233 void *rec);
1234 int (*init)(struct event_trigger_ops *ops,
1235 struct event_trigger_data *data);
1236 void (*free)(struct event_trigger_ops *ops,
1237 struct event_trigger_data *data);
1238 int (*print)(struct seq_file *m,
1239 struct event_trigger_ops *ops,
1240 struct event_trigger_data *data);
1241};
1242
1243/**
1244 * struct event_command - callbacks and data members for event commands
1245 *
1246 * Event commands are invoked by users by writing the command name
1247 * into the 'trigger' file associated with a trace event. The
1248 * parameters associated with a specific invocation of an event
1249 * command are used to create an event trigger instance, which is
1250 * added to the list of trigger instances associated with that trace
1251 * event. When the event is hit, the set of triggers associated with
1252 * that event is invoked.
1253 *
1254 * The data members in this structure provide per-event command data
1255 * for various event commands.
1256 *
1257 * All the data members below, except for @post_trigger, must be set
1258 * for each event command.
1259 *
1260 * @name: The unique name that identifies the event command. This is
1261 * the name used when setting triggers via trigger files.
1262 *
1263 * @trigger_type: A unique id that identifies the event command
1264 * 'type'. This value has two purposes, the first to ensure that
1265 * only one trigger of the same type can be set at a given time
1266 * for a particular event e.g. it doesn't make sense to have both
1267 * a traceon and traceoff trigger attached to a single event at
1268 * the same time, so traceon and traceoff have the same type
1269 * though they have different names. The @trigger_type value is
1270 * also used as a bit value for deferring the actual trigger
1271 * action until after the current event is finished. Some
1272 * commands need to do this if they themselves log to the trace
1273 * buffer (see the @post_trigger() member below). @trigger_type
1274 * values are defined by adding new values to the trigger_type
1275 * enum in include/linux/trace_events.h.
1276 *
1277 * @flags: See the enum event_command_flags below.
1278 *
1279 * All the methods below, except for @set_filter() and @unreg_all(),
1280 * must be implemented.
1281 *
1282 * @func: The callback function responsible for parsing and
1283 * registering the trigger written to the 'trigger' file by the
1284 * user. It allocates the trigger instance and registers it with
1285 * the appropriate trace event. It makes use of the other
1286 * event_command callback functions to orchestrate this, and is
1287 * usually implemented by the generic utility function
1288 * @event_trigger_callback() (see trace_event_triggers.c).
1289 *
1290 * @reg: Adds the trigger to the list of triggers associated with the
1291 * event, and enables the event trigger itself, after
1292 * initializing it (via the event_trigger_ops @init() function).
1293 * This is also where commands can use the @trigger_type value to
1294 * make the decision as to whether or not multiple instances of
1295 * the trigger should be allowed. This is usually implemented by
1296 * the generic utility function @register_trigger() (see
1297 * trace_event_triggers.c).
1298 *
1299 * @unreg: Removes the trigger from the list of triggers associated
1300 * with the event, and disables the event trigger itself, after
1301 * initializing it (via the event_trigger_ops @free() function).
1302 * This is usually implemented by the generic utility function
1303 * @unregister_trigger() (see trace_event_triggers.c).
1304 *
1305 * @unreg_all: An optional function called to remove all the triggers
1306 * from the list of triggers associated with the event. Called
1307 * when a trigger file is opened in truncate mode.
1308 *
1309 * @set_filter: An optional function called to parse and set a filter
1310 * for the trigger. If no @set_filter() method is set for the
1311 * event command, filters set by the user for the command will be
1312 * ignored. This is usually implemented by the generic utility
1313 * function @set_trigger_filter() (see trace_event_triggers.c).
1314 *
1315 * @get_trigger_ops: The callback function invoked to retrieve the
1316 * event_trigger_ops implementation associated with the command.
1317 */
1318struct event_command {
1319 struct list_head list;
1320 char *name;
1321 enum event_trigger_type trigger_type;
1322 int flags;
1323 int (*func)(struct event_command *cmd_ops,
1324 struct trace_event_file *file,
1325 char *glob, char *cmd, char *params);
1326 int (*reg)(char *glob,
1327 struct event_trigger_ops *ops,
1328 struct event_trigger_data *data,
1329 struct trace_event_file *file);
1330 void (*unreg)(char *glob,
1331 struct event_trigger_ops *ops,
1332 struct event_trigger_data *data,
1333 struct trace_event_file *file);
1334 void (*unreg_all)(struct trace_event_file *file);
1335 int (*set_filter)(char *filter_str,
1336 struct event_trigger_data *data,
1337 struct trace_event_file *file);
1338 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1339};
1340
1341/**
1342 * enum event_command_flags - flags for struct event_command
1343 *
1344 * @POST_TRIGGER: A flag that says whether or not this command needs
1345 * to have its action delayed until after the current event has
1346 * been closed. Some triggers need to avoid being invoked while
1347 * an event is currently in the process of being logged, since
1348 * the trigger may itself log data into the trace buffer. Thus
1349 * we make sure the current event is committed before invoking
1350 * those triggers. To do that, the trigger invocation is split
1351 * in two - the first part checks the filter using the current
1352 * trace record; if a command has the @post_trigger flag set, it
1353 * sets a bit for itself in the return value, otherwise it
1354 * directly invokes the trigger. Once all commands have been
1355 * either invoked or set their return flag, the current record is
1356 * either committed or discarded. At that point, if any commands
1357 * have deferred their triggers, those commands are finally
1358 * invoked following the close of the current event. In other
1359 * words, if the event_trigger_ops @func() probe implementation
1360 * itself logs to the trace buffer, this flag should be set,
1361 * otherwise it can be left unspecified.
1362 *
1363 * @NEEDS_REC: A flag that says whether or not this command needs
1364 * access to the trace record in order to perform its function,
1365 * regardless of whether or not it has a filter associated with
1366 * it (filters make a trigger require access to the trace record
1367 * but are not always present).
1368 */
1369enum event_command_flags {
1370 EVENT_CMD_FL_POST_TRIGGER = 1,
1371 EVENT_CMD_FL_NEEDS_REC = 2,
1372};
1373
1374static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1375{
1376 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1377}
1378
1379static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1380{
1381 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1382}
1383
1384extern int trace_event_enable_disable(struct trace_event_file *file,
1385 int enable, int soft_disable);
1386extern int tracing_alloc_snapshot(void);
1387
1388extern const char *__start___trace_bprintk_fmt[];
1389extern const char *__stop___trace_bprintk_fmt[];
1390
1391extern const char *__start___tracepoint_str[];
1392extern const char *__stop___tracepoint_str[];
1393
1394void trace_printk_control(bool enabled);
1395void trace_printk_init_buffers(void);
1396void trace_printk_start_comm(void);
1397int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1398int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1399
1400/*
1401 * Normal trace_printk() and friends allocates special buffers
1402 * to do the manipulation, as well as saves the print formats
1403 * into sections to display. But the trace infrastructure wants
1404 * to use these without the added overhead at the price of being
1405 * a bit slower (used mainly for warnings, where we don't care
1406 * about performance). The internal_trace_puts() is for such
1407 * a purpose.
1408 */
1409#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1410
1411#undef FTRACE_ENTRY
1412#define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1413 extern struct trace_event_call \
1414 __aligned(4) event_##call;
1415#undef FTRACE_ENTRY_DUP
1416#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1417 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1418 filter)
1419#include "trace_entries.h"
1420
1421#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1422int perf_ftrace_event_register(struct trace_event_call *call,
1423 enum trace_reg type, void *data);
1424#else
1425#define perf_ftrace_event_register NULL
1426#endif
1427
1428#ifdef CONFIG_FTRACE_SYSCALLS
1429void init_ftrace_syscalls(void);
1430const char *get_syscall_name(int syscall);
1431#else
1432static inline void init_ftrace_syscalls(void) { }
1433static inline const char *get_syscall_name(int syscall)
1434{
1435 return NULL;
1436}
1437#endif
1438
1439#ifdef CONFIG_EVENT_TRACING
1440void trace_event_init(void);
1441void trace_event_enum_update(struct trace_enum_map **map, int len);
1442#else
1443static inline void __init trace_event_init(void) { }
1444static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { }
1445#endif
1446
1447extern struct trace_iterator *tracepoint_print_iter;
1448
1449#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 */