Loading...
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, filter) \
60 struct struct_name { \
61 struct trace_entry ent; \
62 tstruct \
63 }
64
65#undef TP_ARGS
66#define TP_ARGS(args...) args
67
68#undef FTRACE_ENTRY_DUP
69#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
70
71#undef FTRACE_ENTRY_REG
72#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
73 filter, regfn) \
74 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
75 filter)
76
77#include "trace_entries.h"
78
79/*
80 * syscalls are special, and need special handling, this is why
81 * they are not included in trace_entries.h
82 */
83struct syscall_trace_enter {
84 struct trace_entry ent;
85 int nr;
86 unsigned long args[];
87};
88
89struct syscall_trace_exit {
90 struct trace_entry ent;
91 int nr;
92 long ret;
93};
94
95struct kprobe_trace_entry_head {
96 struct trace_entry ent;
97 unsigned long ip;
98};
99
100struct kretprobe_trace_entry_head {
101 struct trace_entry ent;
102 unsigned long func;
103 unsigned long ret_ip;
104};
105
106struct uprobe_trace_entry_head {
107 struct trace_entry ent;
108 unsigned long ip;
109};
110
111/*
112 * trace_flag_type is an enumeration that holds different
113 * states when a trace occurs. These are:
114 * IRQS_OFF - interrupts were disabled
115 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
116 * NEED_RESCHED - reschedule is requested
117 * HARDIRQ - inside an interrupt handler
118 * SOFTIRQ - inside a softirq handler
119 */
120enum trace_flag_type {
121 TRACE_FLAG_IRQS_OFF = 0x01,
122 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
123 TRACE_FLAG_NEED_RESCHED = 0x04,
124 TRACE_FLAG_HARDIRQ = 0x08,
125 TRACE_FLAG_SOFTIRQ = 0x10,
126};
127
128#define TRACE_BUF_SIZE 1024
129
130/*
131 * The CPU trace array - it consists of thousands of trace entries
132 * plus some other descriptor data: (for example which task started
133 * the trace, etc.)
134 */
135struct trace_array_cpu {
136 atomic_t disabled;
137 void *buffer_page; /* ring buffer spare */
138
139 unsigned long entries;
140 unsigned long saved_latency;
141 unsigned long critical_start;
142 unsigned long critical_end;
143 unsigned long critical_sequence;
144 unsigned long nice;
145 unsigned long policy;
146 unsigned long rt_priority;
147 unsigned long skipped_entries;
148 cycle_t preempt_timestamp;
149 pid_t pid;
150 uid_t uid;
151 char comm[TASK_COMM_LEN];
152};
153
154/*
155 * The trace array - an array of per-CPU trace arrays. This is the
156 * highest level data structure that individual tracers deal with.
157 * They have on/off state as well:
158 */
159struct trace_array {
160 struct ring_buffer *buffer;
161 int cpu;
162 int buffer_disabled;
163 cycle_t time_start;
164 struct task_struct *waiter;
165 struct trace_array_cpu *data[NR_CPUS];
166};
167
168#define FTRACE_CMP_TYPE(var, type) \
169 __builtin_types_compatible_p(typeof(var), type *)
170
171#undef IF_ASSIGN
172#define IF_ASSIGN(var, entry, etype, id) \
173 if (FTRACE_CMP_TYPE(var, etype)) { \
174 var = (typeof(var))(entry); \
175 WARN_ON(id && (entry)->type != id); \
176 break; \
177 }
178
179/* Will cause compile errors if type is not found. */
180extern void __ftrace_bad_type(void);
181
182/*
183 * The trace_assign_type is a verifier that the entry type is
184 * the same as the type being assigned. To add new types simply
185 * add a line with the following format:
186 *
187 * IF_ASSIGN(var, ent, type, id);
188 *
189 * Where "type" is the trace type that includes the trace_entry
190 * as the "ent" item. And "id" is the trace identifier that is
191 * used in the trace_type enum.
192 *
193 * If the type can have more than one id, then use zero.
194 */
195#define trace_assign_type(var, ent) \
196 do { \
197 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
198 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
199 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
200 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
201 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
202 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
203 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
204 TRACE_MMIO_RW); \
205 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
206 TRACE_MMIO_MAP); \
207 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
208 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
209 TRACE_GRAPH_ENT); \
210 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
211 TRACE_GRAPH_RET); \
212 __ftrace_bad_type(); \
213 } while (0)
214
215/*
216 * An option specific to a tracer. This is a boolean value.
217 * The bit is the bit index that sets its value on the
218 * flags value in struct tracer_flags.
219 */
220struct tracer_opt {
221 const char *name; /* Will appear on the trace_options file */
222 u32 bit; /* Mask assigned in val field in tracer_flags */
223};
224
225/*
226 * The set of specific options for a tracer. Your tracer
227 * have to set the initial value of the flags val.
228 */
229struct tracer_flags {
230 u32 val;
231 struct tracer_opt *opts;
232};
233
234/* Makes more easy to define a tracer opt */
235#define TRACER_OPT(s, b) .name = #s, .bit = b
236
237
238/**
239 * struct tracer - a specific tracer and its callbacks to interact with debugfs
240 * @name: the name chosen to select it on the available_tracers file
241 * @init: called when one switches to this tracer (echo name > current_tracer)
242 * @reset: called when one switches to another tracer
243 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
244 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
245 * @open: called when the trace file is opened
246 * @pipe_open: called when the trace_pipe file is opened
247 * @wait_pipe: override how the user waits for traces on trace_pipe
248 * @close: called when the trace file is released
249 * @pipe_close: called when the trace_pipe file is released
250 * @read: override the default read callback on trace_pipe
251 * @splice_read: override the default splice_read callback on trace_pipe
252 * @selftest: selftest to run on boot (see trace_selftest.c)
253 * @print_headers: override the first lines that describe your columns
254 * @print_line: callback that prints a trace
255 * @set_flag: signals one of your private flags changed (trace_options file)
256 * @flags: your private flags
257 */
258struct tracer {
259 const char *name;
260 int (*init)(struct trace_array *tr);
261 void (*reset)(struct trace_array *tr);
262 void (*start)(struct trace_array *tr);
263 void (*stop)(struct trace_array *tr);
264 void (*open)(struct trace_iterator *iter);
265 void (*pipe_open)(struct trace_iterator *iter);
266 void (*wait_pipe)(struct trace_iterator *iter);
267 void (*close)(struct trace_iterator *iter);
268 void (*pipe_close)(struct trace_iterator *iter);
269 ssize_t (*read)(struct trace_iterator *iter,
270 struct file *filp, char __user *ubuf,
271 size_t cnt, loff_t *ppos);
272 ssize_t (*splice_read)(struct trace_iterator *iter,
273 struct file *filp,
274 loff_t *ppos,
275 struct pipe_inode_info *pipe,
276 size_t len,
277 unsigned int flags);
278#ifdef CONFIG_FTRACE_STARTUP_TEST
279 int (*selftest)(struct tracer *trace,
280 struct trace_array *tr);
281#endif
282 void (*print_header)(struct seq_file *m);
283 enum print_line_t (*print_line)(struct trace_iterator *iter);
284 /* If you handled the flag setting, return 0 */
285 int (*set_flag)(u32 old_flags, u32 bit, int set);
286 struct tracer *next;
287 struct tracer_flags *flags;
288 int print_max;
289 int use_max_tr;
290};
291
292
293/* Only current can touch trace_recursion */
294#define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
295#define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
296
297/* Ring buffer has the 10 LSB bits to count */
298#define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
299
300/* for function tracing recursion */
301#define TRACE_INTERNAL_BIT (1<<11)
302#define TRACE_GLOBAL_BIT (1<<12)
303#define TRACE_CONTROL_BIT (1<<13)
304
305/*
306 * Abuse of the trace_recursion.
307 * As we need a way to maintain state if we are tracing the function
308 * graph in irq because we want to trace a particular function that
309 * was called in irq context but we have irq tracing off. Since this
310 * can only be modified by current, we can reuse trace_recursion.
311 */
312#define TRACE_IRQ_BIT (1<<13)
313
314#define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0)
315#define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0)
316#define trace_recursion_test(bit) ((current)->trace_recursion & (bit))
317
318#define TRACE_PIPE_ALL_CPU -1
319
320int tracer_init(struct tracer *t, struct trace_array *tr);
321int tracing_is_enabled(void);
322void trace_wake_up(void);
323void tracing_reset(struct trace_array *tr, int cpu);
324void tracing_reset_online_cpus(struct trace_array *tr);
325void tracing_reset_current(int cpu);
326void tracing_reset_current_online_cpus(void);
327int tracing_open_generic(struct inode *inode, struct file *filp);
328struct dentry *trace_create_file(const char *name,
329 umode_t mode,
330 struct dentry *parent,
331 void *data,
332 const struct file_operations *fops);
333
334struct dentry *tracing_init_dentry(void);
335
336struct ring_buffer_event;
337
338struct ring_buffer_event *
339trace_buffer_lock_reserve(struct ring_buffer *buffer,
340 int type,
341 unsigned long len,
342 unsigned long flags,
343 int pc);
344void trace_buffer_unlock_commit(struct ring_buffer *buffer,
345 struct ring_buffer_event *event,
346 unsigned long flags, int pc);
347
348struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
349 struct trace_array_cpu *data);
350
351struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
352 int *ent_cpu, u64 *ent_ts);
353
354int trace_empty(struct trace_iterator *iter);
355
356void *trace_find_next_entry_inc(struct trace_iterator *iter);
357
358void trace_init_global_iter(struct trace_iterator *iter);
359
360void tracing_iter_reset(struct trace_iterator *iter, int cpu);
361
362void default_wait_pipe(struct trace_iterator *iter);
363void poll_wait_pipe(struct trace_iterator *iter);
364
365void ftrace(struct trace_array *tr,
366 struct trace_array_cpu *data,
367 unsigned long ip,
368 unsigned long parent_ip,
369 unsigned long flags, int pc);
370void tracing_sched_switch_trace(struct trace_array *tr,
371 struct task_struct *prev,
372 struct task_struct *next,
373 unsigned long flags, int pc);
374
375void tracing_sched_wakeup_trace(struct trace_array *tr,
376 struct task_struct *wakee,
377 struct task_struct *cur,
378 unsigned long flags, int pc);
379void trace_function(struct trace_array *tr,
380 unsigned long ip,
381 unsigned long parent_ip,
382 unsigned long flags, int pc);
383void trace_graph_function(struct trace_array *tr,
384 unsigned long ip,
385 unsigned long parent_ip,
386 unsigned long flags, int pc);
387void trace_latency_header(struct seq_file *m);
388void trace_default_header(struct seq_file *m);
389void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
390int trace_empty(struct trace_iterator *iter);
391
392void trace_graph_return(struct ftrace_graph_ret *trace);
393int trace_graph_entry(struct ftrace_graph_ent *trace);
394void set_graph_array(struct trace_array *tr);
395
396void tracing_start_cmdline_record(void);
397void tracing_stop_cmdline_record(void);
398void tracing_sched_switch_assign_trace(struct trace_array *tr);
399void tracing_stop_sched_switch_record(void);
400void tracing_start_sched_switch_record(void);
401int register_tracer(struct tracer *type);
402void unregister_tracer(struct tracer *type);
403int is_tracing_stopped(void);
404enum trace_file_type {
405 TRACE_FILE_LAT_FMT = 1,
406 TRACE_FILE_ANNOTATE = 2,
407};
408
409extern cpumask_var_t __read_mostly tracing_buffer_mask;
410
411#define for_each_tracing_cpu(cpu) \
412 for_each_cpu(cpu, tracing_buffer_mask)
413
414extern unsigned long nsecs_to_usecs(unsigned long nsecs);
415
416extern unsigned long tracing_thresh;
417
418#ifdef CONFIG_TRACER_MAX_TRACE
419extern unsigned long tracing_max_latency;
420
421void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
422void update_max_tr_single(struct trace_array *tr,
423 struct task_struct *tsk, int cpu);
424#endif /* CONFIG_TRACER_MAX_TRACE */
425
426#ifdef CONFIG_STACKTRACE
427void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
428 int skip, int pc);
429
430void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
431 int skip, int pc, struct pt_regs *regs);
432
433void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
434 int pc);
435
436void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
437 int pc);
438#else
439static inline void ftrace_trace_stack(struct ring_buffer *buffer,
440 unsigned long flags, int skip, int pc)
441{
442}
443
444static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
445 unsigned long flags, int skip,
446 int pc, struct pt_regs *regs)
447{
448}
449
450static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
451 unsigned long flags, int pc)
452{
453}
454
455static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
456 int skip, int pc)
457{
458}
459#endif /* CONFIG_STACKTRACE */
460
461extern cycle_t ftrace_now(int cpu);
462
463extern void trace_find_cmdline(int pid, char comm[]);
464
465#ifdef CONFIG_DYNAMIC_FTRACE
466extern unsigned long ftrace_update_tot_cnt;
467#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
468extern int DYN_FTRACE_TEST_NAME(void);
469#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
470extern int DYN_FTRACE_TEST_NAME2(void);
471#endif
472
473extern int ring_buffer_expanded;
474extern bool tracing_selftest_disabled;
475DECLARE_PER_CPU(int, ftrace_cpu_disabled);
476
477#ifdef CONFIG_FTRACE_STARTUP_TEST
478extern int trace_selftest_startup_function(struct tracer *trace,
479 struct trace_array *tr);
480extern int trace_selftest_startup_function_graph(struct tracer *trace,
481 struct trace_array *tr);
482extern int trace_selftest_startup_irqsoff(struct tracer *trace,
483 struct trace_array *tr);
484extern int trace_selftest_startup_preemptoff(struct tracer *trace,
485 struct trace_array *tr);
486extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
487 struct trace_array *tr);
488extern int trace_selftest_startup_wakeup(struct tracer *trace,
489 struct trace_array *tr);
490extern int trace_selftest_startup_nop(struct tracer *trace,
491 struct trace_array *tr);
492extern int trace_selftest_startup_sched_switch(struct tracer *trace,
493 struct trace_array *tr);
494extern int trace_selftest_startup_branch(struct tracer *trace,
495 struct trace_array *tr);
496#endif /* CONFIG_FTRACE_STARTUP_TEST */
497
498extern void *head_page(struct trace_array_cpu *data);
499extern unsigned long long ns2usecs(cycle_t nsec);
500extern int
501trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
502extern int
503trace_vprintk(unsigned long ip, const char *fmt, va_list args);
504extern int
505trace_array_vprintk(struct trace_array *tr,
506 unsigned long ip, const char *fmt, va_list args);
507int trace_array_printk(struct trace_array *tr,
508 unsigned long ip, const char *fmt, ...);
509void trace_printk_seq(struct trace_seq *s);
510enum print_line_t print_trace_line(struct trace_iterator *iter);
511
512extern unsigned long trace_flags;
513
514extern int trace_clock_id;
515
516/* Standard output formatting function used for function return traces */
517#ifdef CONFIG_FUNCTION_GRAPH_TRACER
518
519/* Flag options */
520#define TRACE_GRAPH_PRINT_OVERRUN 0x1
521#define TRACE_GRAPH_PRINT_CPU 0x2
522#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
523#define TRACE_GRAPH_PRINT_PROC 0x8
524#define TRACE_GRAPH_PRINT_DURATION 0x10
525#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
526
527extern enum print_line_t
528print_graph_function_flags(struct trace_iterator *iter, u32 flags);
529extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
530extern enum print_line_t
531trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
532extern void graph_trace_open(struct trace_iterator *iter);
533extern void graph_trace_close(struct trace_iterator *iter);
534extern int __trace_graph_entry(struct trace_array *tr,
535 struct ftrace_graph_ent *trace,
536 unsigned long flags, int pc);
537extern void __trace_graph_return(struct trace_array *tr,
538 struct ftrace_graph_ret *trace,
539 unsigned long flags, int pc);
540
541
542#ifdef CONFIG_DYNAMIC_FTRACE
543/* TODO: make this variable */
544#define FTRACE_GRAPH_MAX_FUNCS 32
545extern int ftrace_graph_filter_enabled;
546extern int ftrace_graph_count;
547extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
548
549static inline int ftrace_graph_addr(unsigned long addr)
550{
551 int i;
552
553 if (!ftrace_graph_filter_enabled)
554 return 1;
555
556 for (i = 0; i < ftrace_graph_count; i++) {
557 if (addr == ftrace_graph_funcs[i]) {
558 /*
559 * If no irqs are to be traced, but a set_graph_function
560 * is set, and called by an interrupt handler, we still
561 * want to trace it.
562 */
563 if (in_irq())
564 trace_recursion_set(TRACE_IRQ_BIT);
565 else
566 trace_recursion_clear(TRACE_IRQ_BIT);
567 return 1;
568 }
569 }
570
571 return 0;
572}
573#else
574static inline int ftrace_graph_addr(unsigned long addr)
575{
576 return 1;
577}
578#endif /* CONFIG_DYNAMIC_FTRACE */
579#else /* CONFIG_FUNCTION_GRAPH_TRACER */
580static inline enum print_line_t
581print_graph_function_flags(struct trace_iterator *iter, u32 flags)
582{
583 return TRACE_TYPE_UNHANDLED;
584}
585#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
586
587extern struct list_head ftrace_pids;
588
589#ifdef CONFIG_FUNCTION_TRACER
590static inline int ftrace_trace_task(struct task_struct *task)
591{
592 if (list_empty(&ftrace_pids))
593 return 1;
594
595 return test_tsk_trace_trace(task);
596}
597extern int ftrace_is_dead(void);
598#else
599static inline int ftrace_trace_task(struct task_struct *task)
600{
601 return 1;
602}
603static inline int ftrace_is_dead(void) { return 0; }
604#endif
605
606int ftrace_event_is_function(struct ftrace_event_call *call);
607
608/*
609 * struct trace_parser - servers for reading the user input separated by spaces
610 * @cont: set if the input is not complete - no final space char was found
611 * @buffer: holds the parsed user input
612 * @idx: user input length
613 * @size: buffer size
614 */
615struct trace_parser {
616 bool cont;
617 char *buffer;
618 unsigned idx;
619 unsigned size;
620};
621
622static inline bool trace_parser_loaded(struct trace_parser *parser)
623{
624 return (parser->idx != 0);
625}
626
627static inline bool trace_parser_cont(struct trace_parser *parser)
628{
629 return parser->cont;
630}
631
632static inline void trace_parser_clear(struct trace_parser *parser)
633{
634 parser->cont = false;
635 parser->idx = 0;
636}
637
638extern int trace_parser_get_init(struct trace_parser *parser, int size);
639extern void trace_parser_put(struct trace_parser *parser);
640extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
641 size_t cnt, loff_t *ppos);
642
643/*
644 * trace_iterator_flags is an enumeration that defines bit
645 * positions into trace_flags that controls the output.
646 *
647 * NOTE: These bits must match the trace_options array in
648 * trace.c.
649 */
650enum trace_iterator_flags {
651 TRACE_ITER_PRINT_PARENT = 0x01,
652 TRACE_ITER_SYM_OFFSET = 0x02,
653 TRACE_ITER_SYM_ADDR = 0x04,
654 TRACE_ITER_VERBOSE = 0x08,
655 TRACE_ITER_RAW = 0x10,
656 TRACE_ITER_HEX = 0x20,
657 TRACE_ITER_BIN = 0x40,
658 TRACE_ITER_BLOCK = 0x80,
659 TRACE_ITER_STACKTRACE = 0x100,
660 TRACE_ITER_PRINTK = 0x200,
661 TRACE_ITER_PREEMPTONLY = 0x400,
662 TRACE_ITER_BRANCH = 0x800,
663 TRACE_ITER_ANNOTATE = 0x1000,
664 TRACE_ITER_USERSTACKTRACE = 0x2000,
665 TRACE_ITER_SYM_USEROBJ = 0x4000,
666 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
667 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
668 TRACE_ITER_LATENCY_FMT = 0x20000,
669 TRACE_ITER_SLEEP_TIME = 0x40000,
670 TRACE_ITER_GRAPH_TIME = 0x80000,
671 TRACE_ITER_RECORD_CMD = 0x100000,
672 TRACE_ITER_OVERWRITE = 0x200000,
673 TRACE_ITER_STOP_ON_FREE = 0x400000,
674 TRACE_ITER_IRQ_INFO = 0x800000,
675};
676
677/*
678 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
679 * control the output of kernel symbols.
680 */
681#define TRACE_ITER_SYM_MASK \
682 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
683
684extern struct tracer nop_trace;
685
686#ifdef CONFIG_BRANCH_TRACER
687extern int enable_branch_tracing(struct trace_array *tr);
688extern void disable_branch_tracing(void);
689static inline int trace_branch_enable(struct trace_array *tr)
690{
691 if (trace_flags & TRACE_ITER_BRANCH)
692 return enable_branch_tracing(tr);
693 return 0;
694}
695static inline void trace_branch_disable(void)
696{
697 /* due to races, always disable */
698 disable_branch_tracing();
699}
700#else
701static inline int trace_branch_enable(struct trace_array *tr)
702{
703 return 0;
704}
705static inline void trace_branch_disable(void)
706{
707}
708#endif /* CONFIG_BRANCH_TRACER */
709
710/* set ring buffers to default size if not already done so */
711int tracing_update_buffers(void);
712
713/* trace event type bit fields, not numeric */
714enum {
715 TRACE_EVENT_TYPE_PRINTF = 1,
716 TRACE_EVENT_TYPE_RAW = 2,
717};
718
719struct ftrace_event_field {
720 struct list_head link;
721 char *name;
722 char *type;
723 int filter_type;
724 int offset;
725 int size;
726 int is_signed;
727};
728
729struct event_filter {
730 int n_preds; /* Number assigned */
731 int a_preds; /* allocated */
732 struct filter_pred *preds;
733 struct filter_pred *root;
734 char *filter_string;
735};
736
737struct event_subsystem {
738 struct list_head list;
739 const char *name;
740 struct dentry *entry;
741 struct event_filter *filter;
742 int nr_events;
743 int ref_count;
744};
745
746#define FILTER_PRED_INVALID ((unsigned short)-1)
747#define FILTER_PRED_IS_RIGHT (1 << 15)
748#define FILTER_PRED_FOLD (1 << 15)
749
750/*
751 * The max preds is the size of unsigned short with
752 * two flags at the MSBs. One bit is used for both the IS_RIGHT
753 * and FOLD flags. The other is reserved.
754 *
755 * 2^14 preds is way more than enough.
756 */
757#define MAX_FILTER_PRED 16384
758
759struct filter_pred;
760struct regex;
761
762typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
763
764typedef int (*regex_match_func)(char *str, struct regex *r, int len);
765
766enum regex_type {
767 MATCH_FULL = 0,
768 MATCH_FRONT_ONLY,
769 MATCH_MIDDLE_ONLY,
770 MATCH_END_ONLY,
771};
772
773struct regex {
774 char pattern[MAX_FILTER_STR_VAL];
775 int len;
776 int field_len;
777 regex_match_func match;
778};
779
780struct filter_pred {
781 filter_pred_fn_t fn;
782 u64 val;
783 struct regex regex;
784 unsigned short *ops;
785 struct ftrace_event_field *field;
786 int offset;
787 int not;
788 int op;
789 unsigned short index;
790 unsigned short parent;
791 unsigned short left;
792 unsigned short right;
793};
794
795extern struct list_head ftrace_common_fields;
796
797extern enum regex_type
798filter_parse_regex(char *buff, int len, char **search, int *not);
799extern void print_event_filter(struct ftrace_event_call *call,
800 struct trace_seq *s);
801extern int apply_event_filter(struct ftrace_event_call *call,
802 char *filter_string);
803extern int apply_subsystem_event_filter(struct event_subsystem *system,
804 char *filter_string);
805extern void print_subsystem_event_filter(struct event_subsystem *system,
806 struct trace_seq *s);
807extern int filter_assign_type(const char *type);
808
809struct list_head *
810trace_get_fields(struct ftrace_event_call *event_call);
811
812static inline int
813filter_check_discard(struct ftrace_event_call *call, void *rec,
814 struct ring_buffer *buffer,
815 struct ring_buffer_event *event)
816{
817 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
818 !filter_match_preds(call->filter, rec)) {
819 ring_buffer_discard_commit(buffer, event);
820 return 1;
821 }
822
823 return 0;
824}
825
826extern void trace_event_enable_cmd_record(bool enable);
827
828extern struct mutex event_mutex;
829extern struct list_head ftrace_events;
830
831extern const char *__start___trace_bprintk_fmt[];
832extern const char *__stop___trace_bprintk_fmt[];
833
834void trace_printk_init_buffers(void);
835
836#undef FTRACE_ENTRY
837#define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
838 extern struct ftrace_event_call \
839 __attribute__((__aligned__(4))) event_##call;
840#undef FTRACE_ENTRY_DUP
841#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
842 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
843 filter)
844#include "trace_entries.h"
845
846#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
847int perf_ftrace_event_register(struct ftrace_event_call *call,
848 enum trace_reg type, void *data);
849#else
850#define perf_ftrace_event_register NULL
851#endif
852
853#endif /* _LINUX_KERNEL_TRACE_H */