1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_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>
16 #ifdef CONFIG_FTRACE_SYSCALLS
17 #include <asm/unistd.h> /* For NR_SYSCALLS */
18 #include <asm/syscall.h> /* some archs define it here */
22 __TRACE_FIRST_TYPE = 0,
43 #define __field(type, item) type item;
46 #define __field_struct(type, item) __field(type, item)
49 #define __field_desc(type, container, item)
52 #define __array(type, item, size) type item[size];
55 #define __array_desc(type, container, item, size)
57 #undef __dynamic_array
58 #define __dynamic_array(type, item) type item[];
61 #define F_STRUCT(args...) args
64 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
65 struct struct_name { \
66 struct trace_entry ent; \
71 #define TP_ARGS(args...) args
73 #undef FTRACE_ENTRY_DUP
74 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
76 #undef FTRACE_ENTRY_REG
77 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
79 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
82 #include "trace_entries.h"
85 * syscalls are special, and need special handling, this is why
86 * they are not included in trace_entries.h
88 struct syscall_trace_enter {
89 struct trace_entry ent;
94 struct syscall_trace_exit {
95 struct trace_entry ent;
100 struct kprobe_trace_entry_head {
101 struct trace_entry ent;
105 struct kretprobe_trace_entry_head {
106 struct trace_entry ent;
108 unsigned long ret_ip;
111 struct uprobe_trace_entry_head {
112 struct trace_entry ent;
117 * trace_flag_type is an enumeration that holds different
118 * states when a trace occurs. These are:
119 * IRQS_OFF - interrupts were disabled
120 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
121 * NEED_RESCHED - reschedule is requested
122 * HARDIRQ - inside an interrupt handler
123 * SOFTIRQ - inside a softirq handler
125 enum trace_flag_type {
126 TRACE_FLAG_IRQS_OFF = 0x01,
127 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
128 TRACE_FLAG_NEED_RESCHED = 0x04,
129 TRACE_FLAG_HARDIRQ = 0x08,
130 TRACE_FLAG_SOFTIRQ = 0x10,
133 #define TRACE_BUF_SIZE 1024
138 struct trace_array *tr;
144 * The CPU trace array - it consists of thousands of trace entries
145 * plus some other descriptor data: (for example which task started
148 struct trace_array_cpu {
149 struct trace_cpu trace_cpu;
151 void *buffer_page; /* ring buffer spare */
153 unsigned long entries;
154 unsigned long saved_latency;
155 unsigned long critical_start;
156 unsigned long critical_end;
157 unsigned long critical_sequence;
159 unsigned long policy;
160 unsigned long rt_priority;
161 unsigned long skipped_entries;
162 cycle_t preempt_timestamp;
165 char comm[TASK_COMM_LEN];
171 * The trace array - an array of per-CPU trace arrays. This is the
172 * highest level data structure that individual tracers deal with.
173 * They have on/off state as well:
176 struct ring_buffer *buffer;
177 struct list_head list;
181 struct trace_cpu trace_cpu; /* place holder */
182 #ifdef CONFIG_FTRACE_SYSCALLS
183 int sys_refcount_enter;
184 int sys_refcount_exit;
185 DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
186 DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
190 struct tracer *current_trace;
193 raw_spinlock_t start_lock;
195 struct dentry *options;
196 struct dentry *percpu_dir;
197 struct dentry *event_dir;
198 struct list_head systems;
199 struct list_head events;
200 struct task_struct *waiter;
201 struct trace_array_cpu __percpu *data;
205 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
208 extern struct list_head ftrace_trace_arrays;
211 * The global tracer (top) should be the first trace array added,
212 * but we check the flag anyway.
214 static inline struct trace_array *top_trace_array(void)
216 struct trace_array *tr;
218 tr = list_entry(ftrace_trace_arrays.prev,
220 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
224 #define FTRACE_CMP_TYPE(var, type) \
225 __builtin_types_compatible_p(typeof(var), type *)
228 #define IF_ASSIGN(var, entry, etype, id) \
229 if (FTRACE_CMP_TYPE(var, etype)) { \
230 var = (typeof(var))(entry); \
231 WARN_ON(id && (entry)->type != id); \
235 /* Will cause compile errors if type is not found. */
236 extern void __ftrace_bad_type(void);
239 * The trace_assign_type is a verifier that the entry type is
240 * the same as the type being assigned. To add new types simply
241 * add a line with the following format:
243 * IF_ASSIGN(var, ent, type, id);
245 * Where "type" is the trace type that includes the trace_entry
246 * as the "ent" item. And "id" is the trace identifier that is
247 * used in the trace_type enum.
249 * If the type can have more than one id, then use zero.
251 #define trace_assign_type(var, ent) \
253 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
254 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
255 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
256 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
257 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
258 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
259 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
261 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
263 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
264 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
266 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
268 __ftrace_bad_type(); \
272 * An option specific to a tracer. This is a boolean value.
273 * The bit is the bit index that sets its value on the
274 * flags value in struct tracer_flags.
277 const char *name; /* Will appear on the trace_options file */
278 u32 bit; /* Mask assigned in val field in tracer_flags */
282 * The set of specific options for a tracer. Your tracer
283 * have to set the initial value of the flags val.
285 struct tracer_flags {
287 struct tracer_opt *opts;
290 /* Makes more easy to define a tracer opt */
291 #define TRACER_OPT(s, b) .name = #s, .bit = b
295 * struct tracer - a specific tracer and its callbacks to interact with debugfs
296 * @name: the name chosen to select it on the available_tracers file
297 * @init: called when one switches to this tracer (echo name > current_tracer)
298 * @reset: called when one switches to another tracer
299 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
300 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
301 * @open: called when the trace file is opened
302 * @pipe_open: called when the trace_pipe file is opened
303 * @wait_pipe: override how the user waits for traces on trace_pipe
304 * @close: called when the trace file is released
305 * @pipe_close: called when the trace_pipe file is released
306 * @read: override the default read callback on trace_pipe
307 * @splice_read: override the default splice_read callback on trace_pipe
308 * @selftest: selftest to run on boot (see trace_selftest.c)
309 * @print_headers: override the first lines that describe your columns
310 * @print_line: callback that prints a trace
311 * @set_flag: signals one of your private flags changed (trace_options file)
312 * @flags: your private flags
316 int (*init)(struct trace_array *tr);
317 void (*reset)(struct trace_array *tr);
318 void (*start)(struct trace_array *tr);
319 void (*stop)(struct trace_array *tr);
320 void (*open)(struct trace_iterator *iter);
321 void (*pipe_open)(struct trace_iterator *iter);
322 void (*wait_pipe)(struct trace_iterator *iter);
323 void (*close)(struct trace_iterator *iter);
324 void (*pipe_close)(struct trace_iterator *iter);
325 ssize_t (*read)(struct trace_iterator *iter,
326 struct file *filp, char __user *ubuf,
327 size_t cnt, loff_t *ppos);
328 ssize_t (*splice_read)(struct trace_iterator *iter,
331 struct pipe_inode_info *pipe,
334 #ifdef CONFIG_FTRACE_STARTUP_TEST
335 int (*selftest)(struct tracer *trace,
336 struct trace_array *tr);
338 void (*print_header)(struct seq_file *m);
339 enum print_line_t (*print_line)(struct trace_iterator *iter);
340 /* If you handled the flag setting, return 0 */
341 int (*set_flag)(u32 old_flags, u32 bit, int set);
342 /* Return 0 if OK with change, else return non-zero */
343 int (*flag_changed)(struct tracer *tracer,
346 struct tracer_flags *flags;
349 bool allocated_snapshot;
354 /* Only current can touch trace_recursion */
357 * For function tracing recursion:
358 * The order of these bits are important.
360 * When function tracing occurs, the following steps are made:
361 * If arch does not support a ftrace feature:
362 * call internal function (uses INTERNAL bits) which calls...
363 * If callback is registered to the "global" list, the list
364 * function is called and recursion checks the GLOBAL bits.
365 * then this function calls...
366 * The function callback, which can use the FTRACE bits to
367 * check for recursion.
369 * Now if the arch does not suppport a feature, and it calls
370 * the global list function which calls the ftrace callback
371 * all three of these steps will do a recursion protection.
372 * There's no reason to do one if the previous caller already
373 * did. The recursion that we are protecting against will
374 * go through the same steps again.
376 * To prevent the multiple recursion checks, if a recursion
377 * bit is set that is higher than the MAX bit of the current
378 * check, then we know that the check was made by the previous
379 * caller, and we can skip the current check.
383 TRACE_BUFFER_NMI_BIT,
384 TRACE_BUFFER_IRQ_BIT,
385 TRACE_BUFFER_SIRQ_BIT,
387 /* Start of function recursion bits */
389 TRACE_FTRACE_NMI_BIT,
390 TRACE_FTRACE_IRQ_BIT,
391 TRACE_FTRACE_SIRQ_BIT,
393 /* GLOBAL_BITs must be greater than FTRACE_BITs */
395 TRACE_GLOBAL_NMI_BIT,
396 TRACE_GLOBAL_IRQ_BIT,
397 TRACE_GLOBAL_SIRQ_BIT,
399 /* INTERNAL_BITs must be greater than GLOBAL_BITs */
401 TRACE_INTERNAL_NMI_BIT,
402 TRACE_INTERNAL_IRQ_BIT,
403 TRACE_INTERNAL_SIRQ_BIT,
408 * Abuse of the trace_recursion.
409 * As we need a way to maintain state if we are tracing the function
410 * graph in irq because we want to trace a particular function that
411 * was called in irq context but we have irq tracing off. Since this
412 * can only be modified by current, we can reuse trace_recursion.
417 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
418 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
419 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
421 #define TRACE_CONTEXT_BITS 4
423 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
424 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
426 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT
427 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
429 #define TRACE_LIST_START TRACE_INTERNAL_BIT
430 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
432 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
434 static __always_inline int trace_get_context_bit(void)
438 if (in_interrupt()) {
452 static __always_inline int trace_test_and_set_recursion(int start, int max)
454 unsigned int val = current->trace_recursion;
457 /* A previous recursion check was made */
458 if ((val & TRACE_CONTEXT_MASK) > max)
461 bit = trace_get_context_bit() + start;
462 if (unlikely(val & (1 << bit)))
466 current->trace_recursion = val;
472 static __always_inline void trace_clear_recursion(int bit)
474 unsigned int val = current->trace_recursion;
483 current->trace_recursion = val;
486 static inline struct ring_buffer_iter *
487 trace_buffer_iter(struct trace_iterator *iter, int cpu)
489 if (iter->buffer_iter && iter->buffer_iter[cpu])
490 return iter->buffer_iter[cpu];
494 int tracer_init(struct tracer *t, struct trace_array *tr);
495 int tracing_is_enabled(void);
496 void tracing_reset(struct trace_array *tr, int cpu);
497 void tracing_reset_online_cpus(struct trace_array *tr);
498 void tracing_reset_current(int cpu);
499 void tracing_reset_all_online_cpus(void);
500 int tracing_open_generic(struct inode *inode, struct file *filp);
501 struct dentry *trace_create_file(const char *name,
503 struct dentry *parent,
505 const struct file_operations *fops);
507 struct dentry *tracing_init_dentry_tr(struct trace_array *tr);
508 struct dentry *tracing_init_dentry(void);
510 struct ring_buffer_event;
512 struct ring_buffer_event *
513 trace_buffer_lock_reserve(struct ring_buffer *buffer,
519 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
520 struct trace_array_cpu *data);
522 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
523 int *ent_cpu, u64 *ent_ts);
525 void __buffer_unlock_commit(struct ring_buffer *buffer,
526 struct ring_buffer_event *event);
528 int trace_empty(struct trace_iterator *iter);
530 void *trace_find_next_entry_inc(struct trace_iterator *iter);
532 void trace_init_global_iter(struct trace_iterator *iter);
534 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
536 void poll_wait_pipe(struct trace_iterator *iter);
538 void ftrace(struct trace_array *tr,
539 struct trace_array_cpu *data,
541 unsigned long parent_ip,
542 unsigned long flags, int pc);
543 void tracing_sched_switch_trace(struct trace_array *tr,
544 struct task_struct *prev,
545 struct task_struct *next,
546 unsigned long flags, int pc);
548 void tracing_sched_wakeup_trace(struct trace_array *tr,
549 struct task_struct *wakee,
550 struct task_struct *cur,
551 unsigned long flags, int pc);
552 void trace_function(struct trace_array *tr,
554 unsigned long parent_ip,
555 unsigned long flags, int pc);
556 void trace_graph_function(struct trace_array *tr,
558 unsigned long parent_ip,
559 unsigned long flags, int pc);
560 void trace_latency_header(struct seq_file *m);
561 void trace_default_header(struct seq_file *m);
562 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
563 int trace_empty(struct trace_iterator *iter);
565 void trace_graph_return(struct ftrace_graph_ret *trace);
566 int trace_graph_entry(struct ftrace_graph_ent *trace);
567 void set_graph_array(struct trace_array *tr);
569 void tracing_start_cmdline_record(void);
570 void tracing_stop_cmdline_record(void);
571 void tracing_sched_switch_assign_trace(struct trace_array *tr);
572 void tracing_stop_sched_switch_record(void);
573 void tracing_start_sched_switch_record(void);
574 int register_tracer(struct tracer *type);
575 int is_tracing_stopped(void);
577 extern cpumask_var_t __read_mostly tracing_buffer_mask;
579 #define for_each_tracing_cpu(cpu) \
580 for_each_cpu(cpu, tracing_buffer_mask)
582 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
584 extern unsigned long tracing_thresh;
586 #ifdef CONFIG_TRACER_MAX_TRACE
587 extern unsigned long tracing_max_latency;
589 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
590 void update_max_tr_single(struct trace_array *tr,
591 struct task_struct *tsk, int cpu);
592 #endif /* CONFIG_TRACER_MAX_TRACE */
594 #ifdef CONFIG_STACKTRACE
595 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
598 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
599 int skip, int pc, struct pt_regs *regs);
601 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
604 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
607 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
608 unsigned long flags, int skip, int pc)
612 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
613 unsigned long flags, int skip,
614 int pc, struct pt_regs *regs)
618 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
619 unsigned long flags, int pc)
623 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
627 #endif /* CONFIG_STACKTRACE */
629 extern cycle_t ftrace_now(int cpu);
631 extern void trace_find_cmdline(int pid, char comm[]);
633 #ifdef CONFIG_DYNAMIC_FTRACE
634 extern unsigned long ftrace_update_tot_cnt;
636 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
637 extern int DYN_FTRACE_TEST_NAME(void);
638 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
639 extern int DYN_FTRACE_TEST_NAME2(void);
641 extern int ring_buffer_expanded;
642 extern bool tracing_selftest_disabled;
643 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
645 #ifdef CONFIG_FTRACE_STARTUP_TEST
646 extern int trace_selftest_startup_function(struct tracer *trace,
647 struct trace_array *tr);
648 extern int trace_selftest_startup_function_graph(struct tracer *trace,
649 struct trace_array *tr);
650 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
651 struct trace_array *tr);
652 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
653 struct trace_array *tr);
654 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
655 struct trace_array *tr);
656 extern int trace_selftest_startup_wakeup(struct tracer *trace,
657 struct trace_array *tr);
658 extern int trace_selftest_startup_nop(struct tracer *trace,
659 struct trace_array *tr);
660 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
661 struct trace_array *tr);
662 extern int trace_selftest_startup_branch(struct tracer *trace,
663 struct trace_array *tr);
664 #endif /* CONFIG_FTRACE_STARTUP_TEST */
666 extern void *head_page(struct trace_array_cpu *data);
667 extern unsigned long long ns2usecs(cycle_t nsec);
669 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
671 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
673 trace_array_vprintk(struct trace_array *tr,
674 unsigned long ip, const char *fmt, va_list args);
675 int trace_array_printk(struct trace_array *tr,
676 unsigned long ip, const char *fmt, ...);
677 void trace_printk_seq(struct trace_seq *s);
678 enum print_line_t print_trace_line(struct trace_iterator *iter);
680 extern unsigned long trace_flags;
682 extern int trace_clock_id;
684 /* Standard output formatting function used for function return traces */
685 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
688 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
689 #define TRACE_GRAPH_PRINT_CPU 0x2
690 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
691 #define TRACE_GRAPH_PRINT_PROC 0x8
692 #define TRACE_GRAPH_PRINT_DURATION 0x10
693 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
695 extern enum print_line_t
696 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
697 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
698 extern enum print_line_t
699 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
700 extern void graph_trace_open(struct trace_iterator *iter);
701 extern void graph_trace_close(struct trace_iterator *iter);
702 extern int __trace_graph_entry(struct trace_array *tr,
703 struct ftrace_graph_ent *trace,
704 unsigned long flags, int pc);
705 extern void __trace_graph_return(struct trace_array *tr,
706 struct ftrace_graph_ret *trace,
707 unsigned long flags, int pc);
710 #ifdef CONFIG_DYNAMIC_FTRACE
711 /* TODO: make this variable */
712 #define FTRACE_GRAPH_MAX_FUNCS 32
713 extern int ftrace_graph_filter_enabled;
714 extern int ftrace_graph_count;
715 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
717 static inline int ftrace_graph_addr(unsigned long addr)
721 if (!ftrace_graph_filter_enabled)
724 for (i = 0; i < ftrace_graph_count; i++) {
725 if (addr == ftrace_graph_funcs[i]) {
727 * If no irqs are to be traced, but a set_graph_function
728 * is set, and called by an interrupt handler, we still
732 trace_recursion_set(TRACE_IRQ_BIT);
734 trace_recursion_clear(TRACE_IRQ_BIT);
742 static inline int ftrace_graph_addr(unsigned long addr)
746 #endif /* CONFIG_DYNAMIC_FTRACE */
747 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
748 static inline enum print_line_t
749 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
751 return TRACE_TYPE_UNHANDLED;
753 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
755 extern struct list_head ftrace_pids;
757 #ifdef CONFIG_FUNCTION_TRACER
758 static inline int ftrace_trace_task(struct task_struct *task)
760 if (list_empty(&ftrace_pids))
763 return test_tsk_trace_trace(task);
765 extern int ftrace_is_dead(void);
767 static inline int ftrace_trace_task(struct task_struct *task)
771 static inline int ftrace_is_dead(void) { return 0; }
774 int ftrace_event_is_function(struct ftrace_event_call *call);
777 * struct trace_parser - servers for reading the user input separated by spaces
778 * @cont: set if the input is not complete - no final space char was found
779 * @buffer: holds the parsed user input
780 * @idx: user input length
783 struct trace_parser {
790 static inline bool trace_parser_loaded(struct trace_parser *parser)
792 return (parser->idx != 0);
795 static inline bool trace_parser_cont(struct trace_parser *parser)
800 static inline void trace_parser_clear(struct trace_parser *parser)
802 parser->cont = false;
806 extern int trace_parser_get_init(struct trace_parser *parser, int size);
807 extern void trace_parser_put(struct trace_parser *parser);
808 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
809 size_t cnt, loff_t *ppos);
812 * trace_iterator_flags is an enumeration that defines bit
813 * positions into trace_flags that controls the output.
815 * NOTE: These bits must match the trace_options array in
818 enum trace_iterator_flags {
819 TRACE_ITER_PRINT_PARENT = 0x01,
820 TRACE_ITER_SYM_OFFSET = 0x02,
821 TRACE_ITER_SYM_ADDR = 0x04,
822 TRACE_ITER_VERBOSE = 0x08,
823 TRACE_ITER_RAW = 0x10,
824 TRACE_ITER_HEX = 0x20,
825 TRACE_ITER_BIN = 0x40,
826 TRACE_ITER_BLOCK = 0x80,
827 TRACE_ITER_STACKTRACE = 0x100,
828 TRACE_ITER_PRINTK = 0x200,
829 TRACE_ITER_PREEMPTONLY = 0x400,
830 TRACE_ITER_BRANCH = 0x800,
831 TRACE_ITER_ANNOTATE = 0x1000,
832 TRACE_ITER_USERSTACKTRACE = 0x2000,
833 TRACE_ITER_SYM_USEROBJ = 0x4000,
834 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
835 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
836 TRACE_ITER_LATENCY_FMT = 0x20000,
837 TRACE_ITER_SLEEP_TIME = 0x40000,
838 TRACE_ITER_GRAPH_TIME = 0x80000,
839 TRACE_ITER_RECORD_CMD = 0x100000,
840 TRACE_ITER_OVERWRITE = 0x200000,
841 TRACE_ITER_STOP_ON_FREE = 0x400000,
842 TRACE_ITER_IRQ_INFO = 0x800000,
843 TRACE_ITER_MARKERS = 0x1000000,
847 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
848 * control the output of kernel symbols.
850 #define TRACE_ITER_SYM_MASK \
851 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
853 extern struct tracer nop_trace;
855 #ifdef CONFIG_BRANCH_TRACER
856 extern int enable_branch_tracing(struct trace_array *tr);
857 extern void disable_branch_tracing(void);
858 static inline int trace_branch_enable(struct trace_array *tr)
860 if (trace_flags & TRACE_ITER_BRANCH)
861 return enable_branch_tracing(tr);
864 static inline void trace_branch_disable(void)
866 /* due to races, always disable */
867 disable_branch_tracing();
870 static inline int trace_branch_enable(struct trace_array *tr)
874 static inline void trace_branch_disable(void)
877 #endif /* CONFIG_BRANCH_TRACER */
879 /* set ring buffers to default size if not already done so */
880 int tracing_update_buffers(void);
882 /* trace event type bit fields, not numeric */
884 TRACE_EVENT_TYPE_PRINTF = 1,
885 TRACE_EVENT_TYPE_RAW = 2,
888 struct ftrace_event_field {
889 struct list_head link;
898 struct event_filter {
899 int n_preds; /* Number assigned */
900 int a_preds; /* allocated */
901 struct filter_pred *preds;
902 struct filter_pred *root;
906 struct event_subsystem {
907 struct list_head list;
909 struct event_filter *filter;
913 struct ftrace_subsystem_dir {
914 struct list_head list;
915 struct event_subsystem *subsystem;
916 struct trace_array *tr;
917 struct dentry *entry;
922 #define FILTER_PRED_INVALID ((unsigned short)-1)
923 #define FILTER_PRED_IS_RIGHT (1 << 15)
924 #define FILTER_PRED_FOLD (1 << 15)
927 * The max preds is the size of unsigned short with
928 * two flags at the MSBs. One bit is used for both the IS_RIGHT
929 * and FOLD flags. The other is reserved.
931 * 2^14 preds is way more than enough.
933 #define MAX_FILTER_PRED 16384
938 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
940 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
950 char pattern[MAX_FILTER_STR_VAL];
953 regex_match_func match;
961 struct ftrace_event_field *field;
965 unsigned short index;
966 unsigned short parent;
968 unsigned short right;
971 extern struct list_head ftrace_common_fields;
973 extern enum regex_type
974 filter_parse_regex(char *buff, int len, char **search, int *not);
975 extern void print_event_filter(struct ftrace_event_call *call,
976 struct trace_seq *s);
977 extern int apply_event_filter(struct ftrace_event_call *call,
978 char *filter_string);
979 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
980 char *filter_string);
981 extern void print_subsystem_event_filter(struct event_subsystem *system,
982 struct trace_seq *s);
983 extern int filter_assign_type(const char *type);
986 trace_get_fields(struct ftrace_event_call *event_call);
989 filter_check_discard(struct ftrace_event_call *call, void *rec,
990 struct ring_buffer *buffer,
991 struct ring_buffer_event *event)
993 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
994 !filter_match_preds(call->filter, rec)) {
995 ring_buffer_discard_commit(buffer, event);
1002 extern void trace_event_enable_cmd_record(bool enable);
1003 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1004 extern int event_trace_del_tracer(struct trace_array *tr);
1006 extern struct mutex event_mutex;
1007 extern struct list_head ftrace_events;
1009 extern const char *__start___trace_bprintk_fmt[];
1010 extern const char *__stop___trace_bprintk_fmt[];
1012 void trace_printk_init_buffers(void);
1013 void trace_printk_start_comm(void);
1014 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1015 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1018 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1019 extern struct ftrace_event_call \
1020 __attribute__((__aligned__(4))) event_##call;
1021 #undef FTRACE_ENTRY_DUP
1022 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1023 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1025 #include "trace_entries.h"
1027 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1028 int perf_ftrace_event_register(struct ftrace_event_call *call,
1029 enum trace_reg type, void *data);
1031 #define perf_ftrace_event_register NULL
1034 #endif /* _LINUX_KERNEL_TRACE_H */