2 #ifndef _LINUX_KERNEL_TRACE_H
3 #define _LINUX_KERNEL_TRACE_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>
19 #ifdef CONFIG_FTRACE_SYSCALLS
20 #include <asm/unistd.h> /* For NR_SYSCALLS */
21 #include <asm/syscall.h> /* some archs define it here */
25 __TRACE_FIRST_TYPE = 0,
47 #define __field(type, item) type item;
50 #define __field_struct(type, item) __field(type, item)
53 #define __field_desc(type, container, item)
56 #define __array(type, item, size) type item[size];
59 #define __array_desc(type, container, item, size)
61 #undef __dynamic_array
62 #define __dynamic_array(type, item) type item[];
65 #define F_STRUCT(args...) args
68 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
69 struct struct_name { \
70 struct trace_entry ent; \
74 #undef FTRACE_ENTRY_DUP
75 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
77 #undef FTRACE_ENTRY_REG
78 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
80 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
83 #include "trace_entries.h"
86 * syscalls are special, and need special handling, this is why
87 * they are not included in trace_entries.h
89 struct syscall_trace_enter {
90 struct trace_entry ent;
95 struct syscall_trace_exit {
96 struct trace_entry ent;
101 struct kprobe_trace_entry_head {
102 struct trace_entry ent;
106 struct kretprobe_trace_entry_head {
107 struct trace_entry ent;
109 unsigned long ret_ip;
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
121 enum 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,
130 #define TRACE_BUF_SIZE 1024
135 * The CPU trace array - it consists of thousands of trace entries
136 * plus some other descriptor data: (for example which task started
139 struct trace_array_cpu {
141 void *buffer_page; /* ring buffer spare */
143 unsigned long entries;
144 unsigned long saved_latency;
145 unsigned long critical_start;
146 unsigned long critical_end;
147 unsigned long critical_sequence;
149 unsigned long policy;
150 unsigned long rt_priority;
151 unsigned long skipped_entries;
152 cycle_t preempt_timestamp;
155 char comm[TASK_COMM_LEN];
161 struct trace_option_dentry;
163 struct trace_buffer {
164 struct trace_array *tr;
165 struct ring_buffer *buffer;
166 struct trace_array_cpu __percpu *data;
171 #define TRACE_FLAGS_MAX_SIZE 32
173 struct trace_options {
174 struct tracer *tracer;
175 struct trace_option_dentry *topts;
178 struct trace_pid_list {
179 unsigned int nr_pids;
185 * The trace array - an array of per-CPU trace arrays. This is the
186 * highest level data structure that individual tracers deal with.
187 * They have on/off state as well:
190 struct list_head list;
192 struct trace_buffer trace_buffer;
193 #ifdef CONFIG_TRACER_MAX_TRACE
195 * The max_buffer is used to snapshot the trace when a maximum
196 * latency is reached, or when the user initiates a snapshot.
197 * Some tracers will use this to store a maximum trace while
198 * it continues examining live traces.
200 * The buffers for the max_buffer are set up the same as the trace_buffer
201 * When a snapshot is taken, the buffer of the max_buffer is swapped
202 * with the buffer of the trace_buffer and the buffers are reset for
203 * the trace_buffer so the tracing can continue.
205 struct trace_buffer max_buffer;
206 bool allocated_snapshot;
207 unsigned long max_latency;
209 struct trace_pid_list __rcu *filtered_pids;
211 * max_lock is used to protect the swapping of buffers
212 * when taking a max snapshot. The buffers themselves are
213 * protected by per_cpu spinlocks. But the action of the swap
214 * needs its own lock.
216 * This is defined as a arch_spinlock_t in order to help
217 * with performance when lockdep debugging is enabled.
219 * It is also used in other places outside the update_max_tr
220 * so it needs to be defined outside of the
221 * CONFIG_TRACER_MAX_TRACE.
223 arch_spinlock_t max_lock;
225 #ifdef CONFIG_FTRACE_SYSCALLS
226 int sys_refcount_enter;
227 int sys_refcount_exit;
228 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
229 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
234 struct tracer *current_trace;
235 unsigned int trace_flags;
236 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
238 raw_spinlock_t start_lock;
240 struct dentry *options;
241 struct dentry *percpu_dir;
242 struct dentry *event_dir;
243 struct trace_options *topts;
244 struct list_head systems;
245 struct list_head events;
246 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
248 #ifdef CONFIG_FUNCTION_TRACER
249 struct ftrace_ops *ops;
250 /* function tracing enabled */
251 int function_enabled;
256 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
259 extern struct list_head ftrace_trace_arrays;
261 extern struct mutex trace_types_lock;
263 extern int trace_array_get(struct trace_array *tr);
264 extern void trace_array_put(struct trace_array *tr);
267 * The global tracer (top) should be the first trace array added,
268 * but we check the flag anyway.
270 static inline struct trace_array *top_trace_array(void)
272 struct trace_array *tr;
274 if (list_empty(&ftrace_trace_arrays))
277 tr = list_entry(ftrace_trace_arrays.prev,
279 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
283 #define FTRACE_CMP_TYPE(var, type) \
284 __builtin_types_compatible_p(typeof(var), type *)
287 #define IF_ASSIGN(var, entry, etype, id) \
288 if (FTRACE_CMP_TYPE(var, etype)) { \
289 var = (typeof(var))(entry); \
290 WARN_ON(id && (entry)->type != id); \
294 /* Will cause compile errors if type is not found. */
295 extern void __ftrace_bad_type(void);
298 * The trace_assign_type is a verifier that the entry type is
299 * the same as the type being assigned. To add new types simply
300 * add a line with the following format:
302 * IF_ASSIGN(var, ent, type, id);
304 * Where "type" is the trace type that includes the trace_entry
305 * as the "ent" item. And "id" is the trace identifier that is
306 * used in the trace_type enum.
308 * If the type can have more than one id, then use zero.
310 #define trace_assign_type(var, ent) \
312 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
313 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
314 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
315 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
316 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
317 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
318 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
319 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
321 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
323 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
324 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
326 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
328 __ftrace_bad_type(); \
332 * An option specific to a tracer. This is a boolean value.
333 * The bit is the bit index that sets its value on the
334 * flags value in struct tracer_flags.
337 const char *name; /* Will appear on the trace_options file */
338 u32 bit; /* Mask assigned in val field in tracer_flags */
342 * The set of specific options for a tracer. Your tracer
343 * have to set the initial value of the flags val.
345 struct tracer_flags {
347 struct tracer_opt *opts;
350 /* Makes more easy to define a tracer opt */
351 #define TRACER_OPT(s, b) .name = #s, .bit = b
354 struct trace_option_dentry {
355 struct tracer_opt *opt;
356 struct tracer_flags *flags;
357 struct trace_array *tr;
358 struct dentry *entry;
362 * struct tracer - a specific tracer and its callbacks to interact with tracefs
363 * @name: the name chosen to select it on the available_tracers file
364 * @init: called when one switches to this tracer (echo name > current_tracer)
365 * @reset: called when one switches to another tracer
366 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
367 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
368 * @update_thresh: called when tracing_thresh is updated
369 * @open: called when the trace file is opened
370 * @pipe_open: called when the trace_pipe file is opened
371 * @close: called when the trace file is released
372 * @pipe_close: called when the trace_pipe file is released
373 * @read: override the default read callback on trace_pipe
374 * @splice_read: override the default splice_read callback on trace_pipe
375 * @selftest: selftest to run on boot (see trace_selftest.c)
376 * @print_headers: override the first lines that describe your columns
377 * @print_line: callback that prints a trace
378 * @set_flag: signals one of your private flags changed (trace_options file)
379 * @flags: your private flags
383 int (*init)(struct trace_array *tr);
384 void (*reset)(struct trace_array *tr);
385 void (*start)(struct trace_array *tr);
386 void (*stop)(struct trace_array *tr);
387 int (*update_thresh)(struct trace_array *tr);
388 void (*open)(struct trace_iterator *iter);
389 void (*pipe_open)(struct trace_iterator *iter);
390 void (*close)(struct trace_iterator *iter);
391 void (*pipe_close)(struct trace_iterator *iter);
392 ssize_t (*read)(struct trace_iterator *iter,
393 struct file *filp, char __user *ubuf,
394 size_t cnt, loff_t *ppos);
395 ssize_t (*splice_read)(struct trace_iterator *iter,
398 struct pipe_inode_info *pipe,
401 #ifdef CONFIG_FTRACE_STARTUP_TEST
402 int (*selftest)(struct tracer *trace,
403 struct trace_array *tr);
405 void (*print_header)(struct seq_file *m);
406 enum print_line_t (*print_line)(struct trace_iterator *iter);
407 /* If you handled the flag setting, return 0 */
408 int (*set_flag)(struct trace_array *tr,
409 u32 old_flags, u32 bit, int set);
410 /* Return 0 if OK with change, else return non-zero */
411 int (*flag_changed)(struct trace_array *tr,
414 struct tracer_flags *flags;
418 bool allow_instances;
419 #ifdef CONFIG_TRACER_MAX_TRACE
425 /* Only current can touch trace_recursion */
428 * For function tracing recursion:
429 * The order of these bits are important.
431 * When function tracing occurs, the following steps are made:
432 * If arch does not support a ftrace feature:
433 * call internal function (uses INTERNAL bits) which calls...
434 * If callback is registered to the "global" list, the list
435 * function is called and recursion checks the GLOBAL bits.
436 * then this function calls...
437 * The function callback, which can use the FTRACE bits to
438 * check for recursion.
440 * Now if the arch does not suppport a feature, and it calls
441 * the global list function which calls the ftrace callback
442 * all three of these steps will do a recursion protection.
443 * There's no reason to do one if the previous caller already
444 * did. The recursion that we are protecting against will
445 * go through the same steps again.
447 * To prevent the multiple recursion checks, if a recursion
448 * bit is set that is higher than the MAX bit of the current
449 * check, then we know that the check was made by the previous
450 * caller, and we can skip the current check.
454 TRACE_BUFFER_NMI_BIT,
455 TRACE_BUFFER_IRQ_BIT,
456 TRACE_BUFFER_SIRQ_BIT,
458 /* Start of function recursion bits */
460 TRACE_FTRACE_NMI_BIT,
461 TRACE_FTRACE_IRQ_BIT,
462 TRACE_FTRACE_SIRQ_BIT,
464 /* INTERNAL_BITs must be greater than FTRACE_BITs */
466 TRACE_INTERNAL_NMI_BIT,
467 TRACE_INTERNAL_IRQ_BIT,
468 TRACE_INTERNAL_SIRQ_BIT,
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.
483 * When transitioning between context, the preempt_count() may
484 * not be correct. Allow for a single recursion to cover this case.
486 TRACE_TRANSITION_BIT,
489 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
490 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
491 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
493 #define TRACE_CONTEXT_BITS 4
495 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
496 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
498 #define TRACE_LIST_START TRACE_INTERNAL_BIT
499 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
501 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
503 static __always_inline int trace_get_context_bit(void)
507 if (in_interrupt()) {
521 static __always_inline int trace_test_and_set_recursion(int start, int max)
523 unsigned int val = current->trace_recursion;
526 /* A previous recursion check was made */
527 if ((val & TRACE_CONTEXT_MASK) > max)
530 bit = trace_get_context_bit() + start;
531 if (unlikely(val & (1 << bit))) {
533 * It could be that preempt_count has not been updated during
534 * a switch between contexts. Allow for a single recursion.
536 bit = TRACE_TRANSITION_BIT;
537 if (trace_recursion_test(bit))
539 trace_recursion_set(bit);
544 /* Normal check passed, clear the transition to allow it again */
545 trace_recursion_clear(TRACE_TRANSITION_BIT);
548 current->trace_recursion = val;
554 static __always_inline void trace_clear_recursion(int bit)
556 unsigned int val = current->trace_recursion;
566 current->trace_recursion = val;
569 static inline struct ring_buffer_iter *
570 trace_buffer_iter(struct trace_iterator *iter, int cpu)
572 if (iter->buffer_iter && iter->buffer_iter[cpu])
573 return iter->buffer_iter[cpu];
577 int tracer_init(struct tracer *t, struct trace_array *tr);
578 int tracing_is_enabled(void);
579 void tracing_reset(struct trace_buffer *buf, int cpu);
580 void tracing_reset_online_cpus(struct trace_buffer *buf);
581 void tracing_reset_current(int cpu);
582 void tracing_reset_all_online_cpus(void);
583 int tracing_open_generic(struct inode *inode, struct file *filp);
584 bool tracing_is_disabled(void);
585 struct dentry *trace_create_file(const char *name,
587 struct dentry *parent,
589 const struct file_operations *fops);
591 struct dentry *tracing_init_dentry(void);
593 struct ring_buffer_event;
595 struct ring_buffer_event *
596 trace_buffer_lock_reserve(struct ring_buffer *buffer,
602 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
603 struct trace_array_cpu *data);
605 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
606 int *ent_cpu, u64 *ent_ts);
608 void __buffer_unlock_commit(struct ring_buffer *buffer,
609 struct ring_buffer_event *event);
611 int trace_empty(struct trace_iterator *iter);
613 void *trace_find_next_entry_inc(struct trace_iterator *iter);
615 void trace_init_global_iter(struct trace_iterator *iter);
617 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
619 void trace_function(struct trace_array *tr,
621 unsigned long parent_ip,
622 unsigned long flags, int pc);
623 void trace_graph_function(struct trace_array *tr,
625 unsigned long parent_ip,
626 unsigned long flags, int pc);
627 void trace_latency_header(struct seq_file *m);
628 void trace_default_header(struct seq_file *m);
629 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
630 int trace_empty(struct trace_iterator *iter);
632 void trace_graph_return(struct ftrace_graph_ret *trace);
633 int trace_graph_entry(struct ftrace_graph_ent *trace);
634 void set_graph_array(struct trace_array *tr);
636 void tracing_start_cmdline_record(void);
637 void tracing_stop_cmdline_record(void);
638 int register_tracer(struct tracer *type);
639 int is_tracing_stopped(void);
641 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
643 extern cpumask_var_t __read_mostly tracing_buffer_mask;
645 #define for_each_tracing_cpu(cpu) \
646 for_each_cpu(cpu, tracing_buffer_mask)
648 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
650 extern unsigned long tracing_thresh;
652 #ifdef CONFIG_TRACER_MAX_TRACE
653 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
654 void update_max_tr_single(struct trace_array *tr,
655 struct task_struct *tsk, int cpu);
656 #endif /* CONFIG_TRACER_MAX_TRACE */
658 #ifdef CONFIG_STACKTRACE
659 void ftrace_trace_userstack(struct trace_array *tr,
660 struct ring_buffer *buffer, unsigned long flags,
663 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
666 static inline void ftrace_trace_userstack(struct trace_array *tr,
667 struct ring_buffer *buffer,
668 unsigned long flags, int pc)
672 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
676 #endif /* CONFIG_STACKTRACE */
678 extern cycle_t ftrace_now(int cpu);
680 extern void trace_find_cmdline(int pid, char comm[]);
682 #ifdef CONFIG_DYNAMIC_FTRACE
683 extern unsigned long ftrace_update_tot_cnt;
685 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
686 extern int DYN_FTRACE_TEST_NAME(void);
687 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
688 extern int DYN_FTRACE_TEST_NAME2(void);
690 extern bool ring_buffer_expanded;
691 extern bool tracing_selftest_disabled;
693 #ifdef CONFIG_FTRACE_STARTUP_TEST
694 extern int trace_selftest_startup_function(struct tracer *trace,
695 struct trace_array *tr);
696 extern int trace_selftest_startup_function_graph(struct tracer *trace,
697 struct trace_array *tr);
698 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
699 struct trace_array *tr);
700 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
701 struct trace_array *tr);
702 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
703 struct trace_array *tr);
704 extern int trace_selftest_startup_wakeup(struct tracer *trace,
705 struct trace_array *tr);
706 extern int trace_selftest_startup_nop(struct tracer *trace,
707 struct trace_array *tr);
708 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
709 struct trace_array *tr);
710 extern int trace_selftest_startup_branch(struct tracer *trace,
711 struct trace_array *tr);
713 * Tracer data references selftest functions that only occur
714 * on boot up. These can be __init functions. Thus, when selftests
715 * are enabled, then the tracers need to reference __init functions.
717 #define __tracer_data __refdata
719 /* Tracers are seldom changed. Optimize when selftests are disabled. */
720 #define __tracer_data __read_mostly
721 #endif /* CONFIG_FTRACE_STARTUP_TEST */
723 extern void *head_page(struct trace_array_cpu *data);
724 extern unsigned long long ns2usecs(cycle_t nsec);
726 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
728 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
730 trace_array_vprintk(struct trace_array *tr,
731 unsigned long ip, const char *fmt, va_list args);
732 int trace_array_printk(struct trace_array *tr,
733 unsigned long ip, const char *fmt, ...);
734 int trace_array_printk_buf(struct ring_buffer *buffer,
735 unsigned long ip, const char *fmt, ...);
736 void trace_printk_seq(struct trace_seq *s);
737 enum print_line_t print_trace_line(struct trace_iterator *iter);
739 extern char trace_find_mark(unsigned long long duration);
741 /* Standard output formatting function used for function return traces */
742 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
745 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
746 #define TRACE_GRAPH_PRINT_CPU 0x2
747 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
748 #define TRACE_GRAPH_PRINT_PROC 0x8
749 #define TRACE_GRAPH_PRINT_DURATION 0x10
750 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
751 #define TRACE_GRAPH_PRINT_IRQS 0x40
752 #define TRACE_GRAPH_PRINT_TAIL 0x80
753 #define TRACE_GRAPH_SLEEP_TIME 0x100
754 #define TRACE_GRAPH_GRAPH_TIME 0x200
755 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
756 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
758 extern void ftrace_graph_sleep_time_control(bool enable);
759 extern void ftrace_graph_graph_time_control(bool enable);
761 extern enum print_line_t
762 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
763 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
765 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
766 extern void graph_trace_open(struct trace_iterator *iter);
767 extern void graph_trace_close(struct trace_iterator *iter);
768 extern int __trace_graph_entry(struct trace_array *tr,
769 struct ftrace_graph_ent *trace,
770 unsigned long flags, int pc);
771 extern void __trace_graph_return(struct trace_array *tr,
772 struct ftrace_graph_ret *trace,
773 unsigned long flags, int pc);
776 #ifdef CONFIG_DYNAMIC_FTRACE
777 /* TODO: make this variable */
778 #define FTRACE_GRAPH_MAX_FUNCS 32
779 extern int ftrace_graph_count;
780 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
781 extern int ftrace_graph_notrace_count;
782 extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS];
784 static inline int ftrace_graph_addr(unsigned long addr)
788 if (!ftrace_graph_count)
791 for (i = 0; i < ftrace_graph_count; i++) {
792 if (addr == ftrace_graph_funcs[i]) {
794 * If no irqs are to be traced, but a set_graph_function
795 * is set, and called by an interrupt handler, we still
799 trace_recursion_set(TRACE_IRQ_BIT);
801 trace_recursion_clear(TRACE_IRQ_BIT);
809 static inline int ftrace_graph_notrace_addr(unsigned long addr)
813 if (!ftrace_graph_notrace_count)
816 for (i = 0; i < ftrace_graph_notrace_count; i++) {
817 if (addr == ftrace_graph_notrace_funcs[i])
824 static inline int ftrace_graph_addr(unsigned long addr)
829 static inline int ftrace_graph_notrace_addr(unsigned long addr)
833 #endif /* CONFIG_DYNAMIC_FTRACE */
834 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
835 static inline enum print_line_t
836 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
838 return TRACE_TYPE_UNHANDLED;
840 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
842 extern struct list_head ftrace_pids;
844 #ifdef CONFIG_FUNCTION_TRACER
845 extern bool ftrace_filter_param __initdata;
846 static inline int ftrace_trace_task(struct task_struct *task)
848 if (list_empty(&ftrace_pids))
851 return test_tsk_trace_trace(task);
853 extern int ftrace_is_dead(void);
854 int ftrace_create_function_files(struct trace_array *tr,
855 struct dentry *parent);
856 void ftrace_destroy_function_files(struct trace_array *tr);
857 void ftrace_init_global_array_ops(struct trace_array *tr);
858 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
859 void ftrace_reset_array_ops(struct trace_array *tr);
860 int using_ftrace_ops_list_func(void);
862 static inline int ftrace_trace_task(struct task_struct *task)
866 static inline int ftrace_is_dead(void) { return 0; }
868 ftrace_create_function_files(struct trace_array *tr,
869 struct dentry *parent)
873 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
874 static inline __init void
875 ftrace_init_global_array_ops(struct trace_array *tr) { }
876 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
877 /* ftace_func_t type is not defined, use macro instead of static inline */
878 #define ftrace_init_array_ops(tr, func) do { } while (0)
879 #endif /* CONFIG_FUNCTION_TRACER */
881 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
882 void ftrace_create_filter_files(struct ftrace_ops *ops,
883 struct dentry *parent);
884 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
887 * The ops parameter passed in is usually undefined.
888 * This must be a macro.
890 #define ftrace_create_filter_files(ops, parent) do { } while (0)
891 #define ftrace_destroy_filter_files(ops) do { } while (0)
892 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
894 bool ftrace_event_is_function(struct trace_event_call *call);
897 * struct trace_parser - servers for reading the user input separated by spaces
898 * @cont: set if the input is not complete - no final space char was found
899 * @buffer: holds the parsed user input
900 * @idx: user input length
903 struct trace_parser {
910 static inline bool trace_parser_loaded(struct trace_parser *parser)
912 return (parser->idx != 0);
915 static inline bool trace_parser_cont(struct trace_parser *parser)
920 static inline void trace_parser_clear(struct trace_parser *parser)
922 parser->cont = false;
926 extern int trace_parser_get_init(struct trace_parser *parser, int size);
927 extern void trace_parser_put(struct trace_parser *parser);
928 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
929 size_t cnt, loff_t *ppos);
932 * Only create function graph options if function graph is configured.
934 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
935 # define FGRAPH_FLAGS \
936 C(DISPLAY_GRAPH, "display-graph"),
938 # define FGRAPH_FLAGS
941 #ifdef CONFIG_BRANCH_TRACER
942 # define BRANCH_FLAGS \
945 # define BRANCH_FLAGS
948 #ifdef CONFIG_FUNCTION_TRACER
949 # define FUNCTION_FLAGS \
950 C(FUNCTION, "function-trace"),
951 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
953 # define FUNCTION_FLAGS
954 # define FUNCTION_DEFAULT_FLAGS 0UL
957 #ifdef CONFIG_STACKTRACE
958 # define STACK_FLAGS \
959 C(STACKTRACE, "stacktrace"),
965 * trace_iterator_flags is an enumeration that defines bit
966 * positions into trace_flags that controls the output.
968 * NOTE: These bits must match the trace_options array in
969 * trace.c (this macro guarantees it).
971 #define TRACE_FLAGS \
972 C(PRINT_PARENT, "print-parent"), \
973 C(SYM_OFFSET, "sym-offset"), \
974 C(SYM_ADDR, "sym-addr"), \
975 C(VERBOSE, "verbose"), \
980 C(PRINTK, "trace_printk"), \
981 C(ANNOTATE, "annotate"), \
982 C(USERSTACKTRACE, "userstacktrace"), \
983 C(SYM_USEROBJ, "sym-userobj"), \
984 C(PRINTK_MSGONLY, "printk-msg-only"), \
985 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
986 C(LATENCY_FMT, "latency-format"), \
987 C(RECORD_CMD, "record-cmd"), \
988 C(OVERWRITE, "overwrite"), \
989 C(STOP_ON_FREE, "disable_on_free"), \
990 C(IRQ_INFO, "irq-info"), \
991 C(MARKERS, "markers"), \
998 * By defining C, we can make TRACE_FLAGS a list of bit names
999 * that will define the bits for the flag masks.
1002 #define C(a, b) TRACE_ITER_##a##_BIT
1004 enum trace_iterator_bits {
1006 /* Make sure we don't go more than we have bits for */
1011 * By redefining C, we can make TRACE_FLAGS a list of masks that
1012 * use the bits as defined above.
1015 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1017 enum trace_iterator_flags { TRACE_FLAGS };
1020 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1021 * control the output of kernel symbols.
1023 #define TRACE_ITER_SYM_MASK \
1024 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1026 extern struct tracer nop_trace;
1028 #ifdef CONFIG_BRANCH_TRACER
1029 extern int enable_branch_tracing(struct trace_array *tr);
1030 extern void disable_branch_tracing(void);
1031 static inline int trace_branch_enable(struct trace_array *tr)
1033 if (tr->trace_flags & TRACE_ITER_BRANCH)
1034 return enable_branch_tracing(tr);
1037 static inline void trace_branch_disable(void)
1039 /* due to races, always disable */
1040 disable_branch_tracing();
1043 static inline int trace_branch_enable(struct trace_array *tr)
1047 static inline void trace_branch_disable(void)
1050 #endif /* CONFIG_BRANCH_TRACER */
1052 /* set ring buffers to default size if not already done so */
1053 int tracing_update_buffers(void);
1055 struct ftrace_event_field {
1056 struct list_head link;
1065 struct event_filter {
1066 int n_preds; /* Number assigned */
1067 int a_preds; /* allocated */
1068 struct filter_pred *preds;
1069 struct filter_pred *root;
1070 char *filter_string;
1073 struct event_subsystem {
1074 struct list_head list;
1076 struct event_filter *filter;
1080 struct trace_subsystem_dir {
1081 struct list_head list;
1082 struct event_subsystem *subsystem;
1083 struct trace_array *tr;
1084 struct dentry *entry;
1089 #define FILTER_PRED_INVALID ((unsigned short)-1)
1090 #define FILTER_PRED_IS_RIGHT (1 << 15)
1091 #define FILTER_PRED_FOLD (1 << 15)
1094 * The max preds is the size of unsigned short with
1095 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1096 * and FOLD flags. The other is reserved.
1098 * 2^14 preds is way more than enough.
1100 #define MAX_FILTER_PRED 16384
1105 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1107 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1117 char pattern[MAX_FILTER_STR_VAL];
1120 regex_match_func match;
1123 struct filter_pred {
1124 filter_pred_fn_t fn;
1127 unsigned short *ops;
1128 struct ftrace_event_field *field;
1132 unsigned short index;
1133 unsigned short parent;
1134 unsigned short left;
1135 unsigned short right;
1138 extern enum regex_type
1139 filter_parse_regex(char *buff, int len, char **search, int *not);
1140 extern void print_event_filter(struct trace_event_file *file,
1141 struct trace_seq *s);
1142 extern int apply_event_filter(struct trace_event_file *file,
1143 char *filter_string);
1144 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1145 char *filter_string);
1146 extern void print_subsystem_event_filter(struct event_subsystem *system,
1147 struct trace_seq *s);
1148 extern int filter_assign_type(const char *type);
1149 extern int create_event_filter(struct trace_event_call *call,
1150 char *filter_str, bool set_str,
1151 struct event_filter **filterp);
1152 extern void free_event_filter(struct event_filter *filter);
1154 struct ftrace_event_field *
1155 trace_find_event_field(struct trace_event_call *call, char *name);
1157 extern void trace_event_enable_cmd_record(bool enable);
1158 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1159 extern int event_trace_del_tracer(struct trace_array *tr);
1161 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1165 static inline void *event_file_data(struct file *filp)
1167 return ACCESS_ONCE(file_inode(filp)->i_private);
1170 extern struct mutex event_mutex;
1171 extern struct list_head ftrace_events;
1173 extern const struct file_operations event_trigger_fops;
1175 extern int register_trigger_cmds(void);
1176 extern void clear_event_triggers(struct trace_array *tr);
1178 struct event_trigger_data {
1179 unsigned long count;
1181 struct event_trigger_ops *ops;
1182 struct event_command *cmd_ops;
1183 struct event_filter __rcu *filter;
1186 struct list_head list;
1190 * struct event_trigger_ops - callbacks for trace event triggers
1192 * The methods in this structure provide per-event trigger hooks for
1193 * various trigger operations.
1195 * All the methods below, except for @init() and @free(), must be
1198 * @func: The trigger 'probe' function called when the triggering
1199 * event occurs. The data passed into this callback is the data
1200 * that was supplied to the event_command @reg() function that
1201 * registered the trigger (see struct event_command).
1203 * @init: An optional initialization function called for the trigger
1204 * when the trigger is registered (via the event_command reg()
1205 * function). This can be used to perform per-trigger
1206 * initialization such as incrementing a per-trigger reference
1207 * count, for instance. This is usually implemented by the
1208 * generic utility function @event_trigger_init() (see
1209 * trace_event_triggers.c).
1211 * @free: An optional de-initialization function called for the
1212 * trigger when the trigger is unregistered (via the
1213 * event_command @reg() function). This can be used to perform
1214 * per-trigger de-initialization such as decrementing a
1215 * per-trigger reference count and freeing corresponding trigger
1216 * data, for instance. This is usually implemented by the
1217 * generic utility function @event_trigger_free() (see
1218 * trace_event_triggers.c).
1220 * @print: The callback function invoked to have the trigger print
1221 * itself. This is usually implemented by a wrapper function
1222 * that calls the generic utility function @event_trigger_print()
1223 * (see trace_event_triggers.c).
1225 struct event_trigger_ops {
1226 void (*func)(struct event_trigger_data *data);
1227 int (*init)(struct event_trigger_ops *ops,
1228 struct event_trigger_data *data);
1229 void (*free)(struct event_trigger_ops *ops,
1230 struct event_trigger_data *data);
1231 int (*print)(struct seq_file *m,
1232 struct event_trigger_ops *ops,
1233 struct event_trigger_data *data);
1237 * struct event_command - callbacks and data members for event commands
1239 * Event commands are invoked by users by writing the command name
1240 * into the 'trigger' file associated with a trace event. The
1241 * parameters associated with a specific invocation of an event
1242 * command are used to create an event trigger instance, which is
1243 * added to the list of trigger instances associated with that trace
1244 * event. When the event is hit, the set of triggers associated with
1245 * that event is invoked.
1247 * The data members in this structure provide per-event command data
1248 * for various event commands.
1250 * All the data members below, except for @post_trigger, must be set
1251 * for each event command.
1253 * @name: The unique name that identifies the event command. This is
1254 * the name used when setting triggers via trigger files.
1256 * @trigger_type: A unique id that identifies the event command
1257 * 'type'. This value has two purposes, the first to ensure that
1258 * only one trigger of the same type can be set at a given time
1259 * for a particular event e.g. it doesn't make sense to have both
1260 * a traceon and traceoff trigger attached to a single event at
1261 * the same time, so traceon and traceoff have the same type
1262 * though they have different names. The @trigger_type value is
1263 * also used as a bit value for deferring the actual trigger
1264 * action until after the current event is finished. Some
1265 * commands need to do this if they themselves log to the trace
1266 * buffer (see the @post_trigger() member below). @trigger_type
1267 * values are defined by adding new values to the trigger_type
1268 * enum in include/linux/trace_events.h.
1270 * @post_trigger: A flag that says whether or not this command needs
1271 * to have its action delayed until after the current event has
1272 * been closed. Some triggers need to avoid being invoked while
1273 * an event is currently in the process of being logged, since
1274 * the trigger may itself log data into the trace buffer. Thus
1275 * we make sure the current event is committed before invoking
1276 * those triggers. To do that, the trigger invocation is split
1277 * in two - the first part checks the filter using the current
1278 * trace record; if a command has the @post_trigger flag set, it
1279 * sets a bit for itself in the return value, otherwise it
1280 * directly invokes the trigger. Once all commands have been
1281 * either invoked or set their return flag, the current record is
1282 * either committed or discarded. At that point, if any commands
1283 * have deferred their triggers, those commands are finally
1284 * invoked following the close of the current event. In other
1285 * words, if the event_trigger_ops @func() probe implementation
1286 * itself logs to the trace buffer, this flag should be set,
1287 * otherwise it can be left unspecified.
1289 * All the methods below, except for @set_filter(), must be
1292 * @func: The callback function responsible for parsing and
1293 * registering the trigger written to the 'trigger' file by the
1294 * user. It allocates the trigger instance and registers it with
1295 * the appropriate trace event. It makes use of the other
1296 * event_command callback functions to orchestrate this, and is
1297 * usually implemented by the generic utility function
1298 * @event_trigger_callback() (see trace_event_triggers.c).
1300 * @reg: Adds the trigger to the list of triggers associated with the
1301 * event, and enables the event trigger itself, after
1302 * initializing it (via the event_trigger_ops @init() function).
1303 * This is also where commands can use the @trigger_type value to
1304 * make the decision as to whether or not multiple instances of
1305 * the trigger should be allowed. This is usually implemented by
1306 * the generic utility function @register_trigger() (see
1307 * trace_event_triggers.c).
1309 * @unreg: Removes the trigger from the list of triggers associated
1310 * with the event, and disables the event trigger itself, after
1311 * initializing it (via the event_trigger_ops @free() function).
1312 * This is usually implemented by the generic utility function
1313 * @unregister_trigger() (see trace_event_triggers.c).
1315 * @set_filter: An optional function called to parse and set a filter
1316 * for the trigger. If no @set_filter() method is set for the
1317 * event command, filters set by the user for the command will be
1318 * ignored. This is usually implemented by the generic utility
1319 * function @set_trigger_filter() (see trace_event_triggers.c).
1321 * @get_trigger_ops: The callback function invoked to retrieve the
1322 * event_trigger_ops implementation associated with the command.
1324 struct event_command {
1325 struct list_head list;
1327 enum event_trigger_type trigger_type;
1329 int (*func)(struct event_command *cmd_ops,
1330 struct trace_event_file *file,
1331 char *glob, char *cmd, char *params);
1332 int (*reg)(char *glob,
1333 struct event_trigger_ops *ops,
1334 struct event_trigger_data *data,
1335 struct trace_event_file *file);
1336 void (*unreg)(char *glob,
1337 struct event_trigger_ops *ops,
1338 struct event_trigger_data *data,
1339 struct trace_event_file *file);
1340 int (*set_filter)(char *filter_str,
1341 struct event_trigger_data *data,
1342 struct trace_event_file *file);
1343 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1346 extern int trace_event_enable_disable(struct trace_event_file *file,
1347 int enable, int soft_disable);
1348 extern int tracing_alloc_snapshot(void);
1350 extern const char *__start___trace_bprintk_fmt[];
1351 extern const char *__stop___trace_bprintk_fmt[];
1353 extern const char *__start___tracepoint_str[];
1354 extern const char *__stop___tracepoint_str[];
1356 void trace_printk_control(bool enabled);
1357 void trace_printk_init_buffers(void);
1358 void trace_printk_start_comm(void);
1359 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1360 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1363 * Normal trace_printk() and friends allocates special buffers
1364 * to do the manipulation, as well as saves the print formats
1365 * into sections to display. But the trace infrastructure wants
1366 * to use these without the added overhead at the price of being
1367 * a bit slower (used mainly for warnings, where we don't care
1368 * about performance). The internal_trace_puts() is for such
1371 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1374 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1375 extern struct trace_event_call \
1376 __aligned(4) event_##call;
1377 #undef FTRACE_ENTRY_DUP
1378 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1379 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1381 #include "trace_entries.h"
1383 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1384 int perf_ftrace_event_register(struct trace_event_call *call,
1385 enum trace_reg type, void *data);
1387 #define perf_ftrace_event_register NULL
1390 #ifdef CONFIG_FTRACE_SYSCALLS
1391 void init_ftrace_syscalls(void);
1393 static inline void init_ftrace_syscalls(void) { }
1396 #ifdef CONFIG_EVENT_TRACING
1397 void trace_event_init(void);
1398 void trace_event_enum_update(struct trace_enum_map **map, int len);
1400 static inline void __init trace_event_init(void) { }
1401 static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { }
1404 extern struct trace_iterator *tracepoint_print_iter;
1407 * Reset the state of the trace_iterator so that it can read consumed data.
1408 * Normally, the trace_iterator is used for reading the data when it is not
1409 * consumed, and must retain state.
1411 static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1413 const size_t offset = offsetof(struct trace_iterator, seq);
1416 * Keep gcc from complaining about overwriting more than just one
1417 * member in the structure.
1419 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
1424 #endif /* _LINUX_KERNEL_TRACE_H */