projects/linux·blob v3.9 · refs

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1#ifndef _LINUX_KERNEL_TRACE_H
2#define _LINUX_KERNEL_TRACE_H
3
4#include <linux/fs.h>
5#include <linux/atomic.h>
6#include <linux/sched.h>
7#include <linux/clocksource.h>
8#include <linux/ring_buffer.h>
9#include <linux/mmiotrace.h>
10#include <linux/tracepoint.h>
11#include <linux/ftrace.h>
12#include <linux/hw_breakpoint.h>
13#include <linux/trace_seq.h>
14#include <linux/ftrace_event.h>
15
16enum trace_type {
17 __TRACE_FIRST_TYPE = 0,
18
19 TRACE_FN,
20 TRACE_CTX,
21 TRACE_WAKE,
22 TRACE_STACK,
23 TRACE_PRINT,
24 TRACE_BPRINT,
25 TRACE_MMIO_RW,
26 TRACE_MMIO_MAP,
27 TRACE_BRANCH,
28 TRACE_GRAPH_RET,
29 TRACE_GRAPH_ENT,
30 TRACE_USER_STACK,
31 TRACE_BLK,
32
33 __TRACE_LAST_TYPE,
34};
35
36
37#undef __field
38#define __field(type, item) type item;
39
40#undef __field_struct
41#define __field_struct(type, item) __field(type, item)
42
43#undef __field_desc
44#define __field_desc(type, container, item)
45
46#undef __array
47#define __array(type, item, size) type item[size];
48
49#undef __array_desc
50#define __array_desc(type, container, item, size)
51
52#undef __dynamic_array
53#define __dynamic_array(type, item) type item[];
54
55#undef F_STRUCT
56#define F_STRUCT(args...) args
57
58#undef FTRACE_ENTRY
59#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
60 struct struct_name { \
61 struct trace_entry ent; \
62 tstruct \
63 }
64
65#undef TP_ARGS
66#define TP_ARGS(args...) args
67
68#undef FTRACE_ENTRY_DUP
69#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
70
71#undef FTRACE_ENTRY_REG
72#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
73 filter, regfn) \
74 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
75 filter)
76
77#include "trace_entries.h"
78
79/*
80 * syscalls are special, and need special handling, this is why
81 * they are not included in trace_entries.h
82 */
83struct syscall_trace_enter {
84 struct trace_entry ent;
85 int nr;
86 unsigned long args[];
87};
88
89struct syscall_trace_exit {
90 struct trace_entry ent;
91 int nr;
92 long ret;
93};
94
95struct kprobe_trace_entry_head {
96 struct trace_entry ent;
97 unsigned long ip;
98};
99
100struct kretprobe_trace_entry_head {
101 struct trace_entry ent;
102 unsigned long func;
103 unsigned long ret_ip;
104};
105
106struct uprobe_trace_entry_head {
107 struct trace_entry ent;
108 unsigned long ip;
109};
110
111/*
112 * trace_flag_type is an enumeration that holds different
113 * states when a trace occurs. These are:
114 * IRQS_OFF - interrupts were disabled
115 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
116 * NEED_RESCHED - reschedule is requested
117 * HARDIRQ - inside an interrupt handler
118 * SOFTIRQ - inside a softirq handler
119 */
120enum trace_flag_type {
121 TRACE_FLAG_IRQS_OFF = 0x01,
122 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
123 TRACE_FLAG_NEED_RESCHED = 0x04,
124 TRACE_FLAG_HARDIRQ = 0x08,
125 TRACE_FLAG_SOFTIRQ = 0x10,
126};
127
128#define TRACE_BUF_SIZE 1024
129
130/*
131 * The CPU trace array - it consists of thousands of trace entries
132 * plus some other descriptor data: (for example which task started
133 * the trace, etc.)
134 */
135struct trace_array_cpu {
136 atomic_t disabled;
137 void *buffer_page; /* ring buffer spare */
138
139 unsigned long entries;
140 unsigned long saved_latency;
141 unsigned long critical_start;
142 unsigned long critical_end;
143 unsigned long critical_sequence;
144 unsigned long nice;
145 unsigned long policy;
146 unsigned long rt_priority;
147 unsigned long skipped_entries;
148 cycle_t preempt_timestamp;
149 pid_t pid;
150 kuid_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 /* Return 0 if OK with change, else return non-zero */
287 int (*flag_changed)(struct tracer *tracer,
288 u32 mask, int set);
289 struct tracer *next;
290 struct tracer_flags *flags;
291 bool print_max;
292 bool use_max_tr;
293 bool allocated_snapshot;
294 bool enabled;
295};
296
297
298/* Only current can touch trace_recursion */
299
300/*
301 * For function tracing recursion:
302 * The order of these bits are important.
303 *
304 * When function tracing occurs, the following steps are made:
305 * If arch does not support a ftrace feature:
306 * call internal function (uses INTERNAL bits) which calls...
307 * If callback is registered to the "global" list, the list
308 * function is called and recursion checks the GLOBAL bits.
309 * then this function calls...
310 * The function callback, which can use the FTRACE bits to
311 * check for recursion.
312 *
313 * Now if the arch does not suppport a feature, and it calls
314 * the global list function which calls the ftrace callback
315 * all three of these steps will do a recursion protection.
316 * There's no reason to do one if the previous caller already
317 * did. The recursion that we are protecting against will
318 * go through the same steps again.
319 *
320 * To prevent the multiple recursion checks, if a recursion
321 * bit is set that is higher than the MAX bit of the current
322 * check, then we know that the check was made by the previous
323 * caller, and we can skip the current check.
324 */
325enum {
326 TRACE_BUFFER_BIT,
327 TRACE_BUFFER_NMI_BIT,
328 TRACE_BUFFER_IRQ_BIT,
329 TRACE_BUFFER_SIRQ_BIT,
330
331 /* Start of function recursion bits */
332 TRACE_FTRACE_BIT,
333 TRACE_FTRACE_NMI_BIT,
334 TRACE_FTRACE_IRQ_BIT,
335 TRACE_FTRACE_SIRQ_BIT,
336
337 /* GLOBAL_BITs must be greater than FTRACE_BITs */
338 TRACE_GLOBAL_BIT,
339 TRACE_GLOBAL_NMI_BIT,
340 TRACE_GLOBAL_IRQ_BIT,
341 TRACE_GLOBAL_SIRQ_BIT,
342
343 /* INTERNAL_BITs must be greater than GLOBAL_BITs */
344 TRACE_INTERNAL_BIT,
345 TRACE_INTERNAL_NMI_BIT,
346 TRACE_INTERNAL_IRQ_BIT,
347 TRACE_INTERNAL_SIRQ_BIT,
348
349 TRACE_CONTROL_BIT,
350
351/*
352 * Abuse of the trace_recursion.
353 * As we need a way to maintain state if we are tracing the function
354 * graph in irq because we want to trace a particular function that
355 * was called in irq context but we have irq tracing off. Since this
356 * can only be modified by current, we can reuse trace_recursion.
357 */
358 TRACE_IRQ_BIT,
359};
360
361#define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
362#define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
363#define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
364
365#define TRACE_CONTEXT_BITS 4
366
367#define TRACE_FTRACE_START TRACE_FTRACE_BIT
368#define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
369
370#define TRACE_GLOBAL_START TRACE_GLOBAL_BIT
371#define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
372
373#define TRACE_LIST_START TRACE_INTERNAL_BIT
374#define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
375
376#define TRACE_CONTEXT_MASK TRACE_LIST_MAX
377
378static __always_inline int trace_get_context_bit(void)
379{
380 int bit;
381
382 if (in_interrupt()) {
383 if (in_nmi())
384 bit = 0;
385
386 else if (in_irq())
387 bit = 1;
388 else
389 bit = 2;
390 } else
391 bit = 3;
392
393 return bit;
394}
395
396static __always_inline int trace_test_and_set_recursion(int start, int max)
397{
398 unsigned int val = current->trace_recursion;
399 int bit;
400
401 /* A previous recursion check was made */
402 if ((val & TRACE_CONTEXT_MASK) > max)
403 return 0;
404
405 bit = trace_get_context_bit() + start;
406 if (unlikely(val & (1 << bit)))
407 return -1;
408
409 val |= 1 << bit;
410 current->trace_recursion = val;
411 barrier();
412
413 return bit;
414}
415
416static __always_inline void trace_clear_recursion(int bit)
417{
418 unsigned int val = current->trace_recursion;
419
420 if (!bit)
421 return;
422
423 bit = 1 << bit;
424 val &= ~bit;
425
426 barrier();
427 current->trace_recursion = val;
428}
429
430#define TRACE_PIPE_ALL_CPU -1
431
432static inline struct ring_buffer_iter *
433trace_buffer_iter(struct trace_iterator *iter, int cpu)
434{
435 if (iter->buffer_iter && iter->buffer_iter[cpu])
436 return iter->buffer_iter[cpu];
437 return NULL;
438}
439
440int tracer_init(struct tracer *t, struct trace_array *tr);
441int tracing_is_enabled(void);
442void tracing_reset(struct trace_array *tr, int cpu);
443void tracing_reset_online_cpus(struct trace_array *tr);
444void tracing_reset_current(int cpu);
445void tracing_reset_current_online_cpus(void);
446int tracing_open_generic(struct inode *inode, struct file *filp);
447struct dentry *trace_create_file(const char *name,
448 umode_t mode,
449 struct dentry *parent,
450 void *data,
451 const struct file_operations *fops);
452
453struct dentry *tracing_init_dentry(void);
454
455struct ring_buffer_event;
456
457struct ring_buffer_event *
458trace_buffer_lock_reserve(struct ring_buffer *buffer,
459 int type,
460 unsigned long len,
461 unsigned long flags,
462 int pc);
463
464struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
465 struct trace_array_cpu *data);
466
467struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
468 int *ent_cpu, u64 *ent_ts);
469
470void __buffer_unlock_commit(struct ring_buffer *buffer,
471 struct ring_buffer_event *event);
472
473int trace_empty(struct trace_iterator *iter);
474
475void *trace_find_next_entry_inc(struct trace_iterator *iter);
476
477void trace_init_global_iter(struct trace_iterator *iter);
478
479void tracing_iter_reset(struct trace_iterator *iter, int cpu);
480
481void poll_wait_pipe(struct trace_iterator *iter);
482
483void ftrace(struct trace_array *tr,
484 struct trace_array_cpu *data,
485 unsigned long ip,
486 unsigned long parent_ip,
487 unsigned long flags, int pc);
488void tracing_sched_switch_trace(struct trace_array *tr,
489 struct task_struct *prev,
490 struct task_struct *next,
491 unsigned long flags, int pc);
492
493void tracing_sched_wakeup_trace(struct trace_array *tr,
494 struct task_struct *wakee,
495 struct task_struct *cur,
496 unsigned long flags, int pc);
497void trace_function(struct trace_array *tr,
498 unsigned long ip,
499 unsigned long parent_ip,
500 unsigned long flags, int pc);
501void trace_graph_function(struct trace_array *tr,
502 unsigned long ip,
503 unsigned long parent_ip,
504 unsigned long flags, int pc);
505void trace_latency_header(struct seq_file *m);
506void trace_default_header(struct seq_file *m);
507void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
508int trace_empty(struct trace_iterator *iter);
509
510void trace_graph_return(struct ftrace_graph_ret *trace);
511int trace_graph_entry(struct ftrace_graph_ent *trace);
512void set_graph_array(struct trace_array *tr);
513
514void tracing_start_cmdline_record(void);
515void tracing_stop_cmdline_record(void);
516void tracing_sched_switch_assign_trace(struct trace_array *tr);
517void tracing_stop_sched_switch_record(void);
518void tracing_start_sched_switch_record(void);
519int register_tracer(struct tracer *type);
520int is_tracing_stopped(void);
521
522extern cpumask_var_t __read_mostly tracing_buffer_mask;
523
524#define for_each_tracing_cpu(cpu) \
525 for_each_cpu(cpu, tracing_buffer_mask)
526
527extern unsigned long nsecs_to_usecs(unsigned long nsecs);
528
529extern unsigned long tracing_thresh;
530
531#ifdef CONFIG_TRACER_MAX_TRACE
532extern unsigned long tracing_max_latency;
533
534void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
535void update_max_tr_single(struct trace_array *tr,
536 struct task_struct *tsk, int cpu);
537#endif /* CONFIG_TRACER_MAX_TRACE */
538
539#ifdef CONFIG_STACKTRACE
540void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
541 int skip, int pc);
542
543void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
544 int skip, int pc, struct pt_regs *regs);
545
546void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
547 int pc);
548
549void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
550 int pc);
551#else
552static inline void ftrace_trace_stack(struct ring_buffer *buffer,
553 unsigned long flags, int skip, int pc)
554{
555}
556
557static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
558 unsigned long flags, int skip,
559 int pc, struct pt_regs *regs)
560{
561}
562
563static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
564 unsigned long flags, int pc)
565{
566}
567
568static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
569 int skip, int pc)
570{
571}
572#endif /* CONFIG_STACKTRACE */
573
574extern cycle_t ftrace_now(int cpu);
575
576extern void trace_find_cmdline(int pid, char comm[]);
577
578#ifdef CONFIG_DYNAMIC_FTRACE
579extern unsigned long ftrace_update_tot_cnt;
580#endif
581#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
582extern int DYN_FTRACE_TEST_NAME(void);
583#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
584extern int DYN_FTRACE_TEST_NAME2(void);
585
586extern int ring_buffer_expanded;
587extern bool tracing_selftest_disabled;
588DECLARE_PER_CPU(int, ftrace_cpu_disabled);
589
590#ifdef CONFIG_FTRACE_STARTUP_TEST
591extern int trace_selftest_startup_function(struct tracer *trace,
592 struct trace_array *tr);
593extern int trace_selftest_startup_function_graph(struct tracer *trace,
594 struct trace_array *tr);
595extern int trace_selftest_startup_irqsoff(struct tracer *trace,
596 struct trace_array *tr);
597extern int trace_selftest_startup_preemptoff(struct tracer *trace,
598 struct trace_array *tr);
599extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
600 struct trace_array *tr);
601extern int trace_selftest_startup_wakeup(struct tracer *trace,
602 struct trace_array *tr);
603extern int trace_selftest_startup_nop(struct tracer *trace,
604 struct trace_array *tr);
605extern int trace_selftest_startup_sched_switch(struct tracer *trace,
606 struct trace_array *tr);
607extern int trace_selftest_startup_branch(struct tracer *trace,
608 struct trace_array *tr);
609#endif /* CONFIG_FTRACE_STARTUP_TEST */
610
611extern void *head_page(struct trace_array_cpu *data);
612extern unsigned long long ns2usecs(cycle_t nsec);
613extern int
614trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
615extern int
616trace_vprintk(unsigned long ip, const char *fmt, va_list args);
617extern int
618trace_array_vprintk(struct trace_array *tr,
619 unsigned long ip, const char *fmt, va_list args);
620int trace_array_printk(struct trace_array *tr,
621 unsigned long ip, const char *fmt, ...);
622void trace_printk_seq(struct trace_seq *s);
623enum print_line_t print_trace_line(struct trace_iterator *iter);
624
625extern unsigned long trace_flags;
626
627extern int trace_clock_id;
628
629/* Standard output formatting function used for function return traces */
630#ifdef CONFIG_FUNCTION_GRAPH_TRACER
631
632/* Flag options */
633#define TRACE_GRAPH_PRINT_OVERRUN 0x1
634#define TRACE_GRAPH_PRINT_CPU 0x2
635#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
636#define TRACE_GRAPH_PRINT_PROC 0x8
637#define TRACE_GRAPH_PRINT_DURATION 0x10
638#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
639
640extern enum print_line_t
641print_graph_function_flags(struct trace_iterator *iter, u32 flags);
642extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
643extern enum print_line_t
644trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
645extern void graph_trace_open(struct trace_iterator *iter);
646extern void graph_trace_close(struct trace_iterator *iter);
647extern int __trace_graph_entry(struct trace_array *tr,
648 struct ftrace_graph_ent *trace,
649 unsigned long flags, int pc);
650extern void __trace_graph_return(struct trace_array *tr,
651 struct ftrace_graph_ret *trace,
652 unsigned long flags, int pc);
653
654
655#ifdef CONFIG_DYNAMIC_FTRACE
656/* TODO: make this variable */
657#define FTRACE_GRAPH_MAX_FUNCS 32
658extern int ftrace_graph_filter_enabled;
659extern int ftrace_graph_count;
660extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
661
662static inline int ftrace_graph_addr(unsigned long addr)
663{
664 int i;
665
666 if (!ftrace_graph_filter_enabled)
667 return 1;
668
669 for (i = 0; i < ftrace_graph_count; i++) {
670 if (addr == ftrace_graph_funcs[i]) {
671 /*
672 * If no irqs are to be traced, but a set_graph_function
673 * is set, and called by an interrupt handler, we still
674 * want to trace it.
675 */
676 if (in_irq())
677 trace_recursion_set(TRACE_IRQ_BIT);
678 else
679 trace_recursion_clear(TRACE_IRQ_BIT);
680 return 1;
681 }
682 }
683
684 return 0;
685}
686#else
687static inline int ftrace_graph_addr(unsigned long addr)
688{
689 return 1;
690}
691#endif /* CONFIG_DYNAMIC_FTRACE */
692#else /* CONFIG_FUNCTION_GRAPH_TRACER */
693static inline enum print_line_t
694print_graph_function_flags(struct trace_iterator *iter, u32 flags)
695{
696 return TRACE_TYPE_UNHANDLED;
697}
698#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
699
700extern struct list_head ftrace_pids;
701
702#ifdef CONFIG_FUNCTION_TRACER
703static inline int ftrace_trace_task(struct task_struct *task)
704{
705 if (list_empty(&ftrace_pids))
706 return 1;
707
708 return test_tsk_trace_trace(task);
709}
710extern int ftrace_is_dead(void);
711#else
712static inline int ftrace_trace_task(struct task_struct *task)
713{
714 return 1;
715}
716static inline int ftrace_is_dead(void) { return 0; }
717#endif
718
719int ftrace_event_is_function(struct ftrace_event_call *call);
720
721/*
722 * struct trace_parser - servers for reading the user input separated by spaces
723 * @cont: set if the input is not complete - no final space char was found
724 * @buffer: holds the parsed user input
725 * @idx: user input length
726 * @size: buffer size
727 */
728struct trace_parser {
729 bool cont;
730 char *buffer;
731 unsigned idx;
732 unsigned size;
733};
734
735static inline bool trace_parser_loaded(struct trace_parser *parser)
736{
737 return (parser->idx != 0);
738}
739
740static inline bool trace_parser_cont(struct trace_parser *parser)
741{
742 return parser->cont;
743}
744
745static inline void trace_parser_clear(struct trace_parser *parser)
746{
747 parser->cont = false;
748 parser->idx = 0;
749}
750
751extern int trace_parser_get_init(struct trace_parser *parser, int size);
752extern void trace_parser_put(struct trace_parser *parser);
753extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
754 size_t cnt, loff_t *ppos);
755
756/*
757 * trace_iterator_flags is an enumeration that defines bit
758 * positions into trace_flags that controls the output.
759 *
760 * NOTE: These bits must match the trace_options array in
761 * trace.c.
762 */
763enum trace_iterator_flags {
764 TRACE_ITER_PRINT_PARENT = 0x01,
765 TRACE_ITER_SYM_OFFSET = 0x02,
766 TRACE_ITER_SYM_ADDR = 0x04,
767 TRACE_ITER_VERBOSE = 0x08,
768 TRACE_ITER_RAW = 0x10,
769 TRACE_ITER_HEX = 0x20,
770 TRACE_ITER_BIN = 0x40,
771 TRACE_ITER_BLOCK = 0x80,
772 TRACE_ITER_STACKTRACE = 0x100,
773 TRACE_ITER_PRINTK = 0x200,
774 TRACE_ITER_PREEMPTONLY = 0x400,
775 TRACE_ITER_BRANCH = 0x800,
776 TRACE_ITER_ANNOTATE = 0x1000,
777 TRACE_ITER_USERSTACKTRACE = 0x2000,
778 TRACE_ITER_SYM_USEROBJ = 0x4000,
779 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
780 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
781 TRACE_ITER_LATENCY_FMT = 0x20000,
782 TRACE_ITER_SLEEP_TIME = 0x40000,
783 TRACE_ITER_GRAPH_TIME = 0x80000,
784 TRACE_ITER_RECORD_CMD = 0x100000,
785 TRACE_ITER_OVERWRITE = 0x200000,
786 TRACE_ITER_STOP_ON_FREE = 0x400000,
787 TRACE_ITER_IRQ_INFO = 0x800000,
788 TRACE_ITER_MARKERS = 0x1000000,
789};
790
791/*
792 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
793 * control the output of kernel symbols.
794 */
795#define TRACE_ITER_SYM_MASK \
796 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
797
798extern struct tracer nop_trace;
799
800#ifdef CONFIG_BRANCH_TRACER
801extern int enable_branch_tracing(struct trace_array *tr);
802extern void disable_branch_tracing(void);
803static inline int trace_branch_enable(struct trace_array *tr)
804{
805 if (trace_flags & TRACE_ITER_BRANCH)
806 return enable_branch_tracing(tr);
807 return 0;
808}
809static inline void trace_branch_disable(void)
810{
811 /* due to races, always disable */
812 disable_branch_tracing();
813}
814#else
815static inline int trace_branch_enable(struct trace_array *tr)
816{
817 return 0;
818}
819static inline void trace_branch_disable(void)
820{
821}
822#endif /* CONFIG_BRANCH_TRACER */
823
824/* set ring buffers to default size if not already done so */
825int tracing_update_buffers(void);
826
827/* trace event type bit fields, not numeric */
828enum {
829 TRACE_EVENT_TYPE_PRINTF = 1,
830 TRACE_EVENT_TYPE_RAW = 2,
831};
832
833struct ftrace_event_field {
834 struct list_head link;
835 char *name;
836 char *type;
837 int filter_type;
838 int offset;
839 int size;
840 int is_signed;
841};
842
843struct event_filter {
844 int n_preds; /* Number assigned */
845 int a_preds; /* allocated */
846 struct filter_pred *preds;
847 struct filter_pred *root;
848 char *filter_string;
849};
850
851struct event_subsystem {
852 struct list_head list;
853 const char *name;
854 struct dentry *entry;
855 struct event_filter *filter;
856 int nr_events;
857 int ref_count;
858};
859
860#define FILTER_PRED_INVALID ((unsigned short)-1)
861#define FILTER_PRED_IS_RIGHT (1 << 15)
862#define FILTER_PRED_FOLD (1 << 15)
863
864/*
865 * The max preds is the size of unsigned short with
866 * two flags at the MSBs. One bit is used for both the IS_RIGHT
867 * and FOLD flags. The other is reserved.
868 *
869 * 2^14 preds is way more than enough.
870 */
871#define MAX_FILTER_PRED 16384
872
873struct filter_pred;
874struct regex;
875
876typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
877
878typedef int (*regex_match_func)(char *str, struct regex *r, int len);
879
880enum regex_type {
881 MATCH_FULL = 0,
882 MATCH_FRONT_ONLY,
883 MATCH_MIDDLE_ONLY,
884 MATCH_END_ONLY,
885};
886
887struct regex {
888 char pattern[MAX_FILTER_STR_VAL];
889 int len;
890 int field_len;
891 regex_match_func match;
892};
893
894struct filter_pred {
895 filter_pred_fn_t fn;
896 u64 val;
897 struct regex regex;
898 unsigned short *ops;
899 struct ftrace_event_field *field;
900 int offset;
901 int not;
902 int op;
903 unsigned short index;
904 unsigned short parent;
905 unsigned short left;
906 unsigned short right;
907};
908
909extern struct list_head ftrace_common_fields;
910
911extern enum regex_type
912filter_parse_regex(char *buff, int len, char **search, int *not);
913extern void print_event_filter(struct ftrace_event_call *call,
914 struct trace_seq *s);
915extern int apply_event_filter(struct ftrace_event_call *call,
916 char *filter_string);
917extern int apply_subsystem_event_filter(struct event_subsystem *system,
918 char *filter_string);
919extern void print_subsystem_event_filter(struct event_subsystem *system,
920 struct trace_seq *s);
921extern int filter_assign_type(const char *type);
922
923struct list_head *
924trace_get_fields(struct ftrace_event_call *event_call);
925
926static inline int
927filter_check_discard(struct ftrace_event_call *call, void *rec,
928 struct ring_buffer *buffer,
929 struct ring_buffer_event *event)
930{
931 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
932 !filter_match_preds(call->filter, rec)) {
933 ring_buffer_discard_commit(buffer, event);
934 return 1;
935 }
936
937 return 0;
938}
939
940extern void trace_event_enable_cmd_record(bool enable);
941
942extern struct mutex event_mutex;
943extern struct list_head ftrace_events;
944
945extern const char *__start___trace_bprintk_fmt[];
946extern const char *__stop___trace_bprintk_fmt[];
947
948void trace_printk_init_buffers(void);
949void trace_printk_start_comm(void);
950int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
951int set_tracer_flag(unsigned int mask, int enabled);
952
953#undef FTRACE_ENTRY
954#define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
955 extern struct ftrace_event_call \
956 __attribute__((__aligned__(4))) event_##call;
957#undef FTRACE_ENTRY_DUP
958#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
959 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
960 filter)
961#include "trace_entries.h"
962
963#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
964int perf_ftrace_event_register(struct ftrace_event_call *call,
965 enum trace_reg type, void *data);
966#else
967#define perf_ftrace_event_register NULL
968#endif
969
970#endif /* _LINUX_KERNEL_TRACE_H */