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>
18 #include <linux/glob.h>
20 #ifdef CONFIG_FTRACE_SYSCALLS
21 #include <asm/unistd.h> /* For NR_SYSCALLS */
22 #include <asm/syscall.h> /* some archs define it here */
26 __TRACE_FIRST_TYPE = 0,
50 #define __field(type, item) type item;
53 #define __field_struct(type, item) __field(type, item)
56 #define __field_desc(type, container, item)
59 #define __array(type, item, size) type item[size];
62 #define __array_desc(type, container, item, size)
64 #undef __dynamic_array
65 #define __dynamic_array(type, item) type item[];
68 #define F_STRUCT(args...) args
71 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
72 struct struct_name { \
73 struct trace_entry ent; \
77 #undef FTRACE_ENTRY_DUP
78 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
80 #undef FTRACE_ENTRY_REG
81 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
83 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
86 #undef FTRACE_ENTRY_PACKED
87 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \
89 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
92 #include "trace_entries.h"
95 * syscalls are special, and need special handling, this is why
96 * they are not included in trace_entries.h
98 struct syscall_trace_enter {
99 struct trace_entry ent;
101 unsigned long args[];
104 struct syscall_trace_exit {
105 struct trace_entry ent;
110 struct kprobe_trace_entry_head {
111 struct trace_entry ent;
115 struct kretprobe_trace_entry_head {
116 struct trace_entry ent;
118 unsigned long ret_ip;
122 * trace_flag_type is an enumeration that holds different
123 * states when a trace occurs. These are:
124 * IRQS_OFF - interrupts were disabled
125 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
126 * NEED_RESCHED - reschedule is requested
127 * HARDIRQ - inside an interrupt handler
128 * SOFTIRQ - inside a softirq handler
130 enum trace_flag_type {
131 TRACE_FLAG_IRQS_OFF = 0x01,
132 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
133 TRACE_FLAG_NEED_RESCHED = 0x04,
134 TRACE_FLAG_HARDIRQ = 0x08,
135 TRACE_FLAG_SOFTIRQ = 0x10,
136 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
137 TRACE_FLAG_NMI = 0x40,
140 #define TRACE_BUF_SIZE 1024
145 * The CPU trace array - it consists of thousands of trace entries
146 * plus some other descriptor data: (for example which task started
149 struct trace_array_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 u64 preempt_timestamp;
165 char comm[TASK_COMM_LEN];
168 #ifdef CONFIG_FUNCTION_TRACER
169 bool ftrace_ignore_pid;
174 struct trace_option_dentry;
176 struct trace_buffer {
177 struct trace_array *tr;
178 struct ring_buffer *buffer;
179 struct trace_array_cpu __percpu *data;
184 #define TRACE_FLAGS_MAX_SIZE 32
186 struct trace_options {
187 struct tracer *tracer;
188 struct trace_option_dentry *topts;
191 struct trace_pid_list {
197 * The trace array - an array of per-CPU trace arrays. This is the
198 * highest level data structure that individual tracers deal with.
199 * They have on/off state as well:
202 struct list_head list;
204 struct trace_buffer trace_buffer;
205 #ifdef CONFIG_TRACER_MAX_TRACE
207 * The max_buffer is used to snapshot the trace when a maximum
208 * latency is reached, or when the user initiates a snapshot.
209 * Some tracers will use this to store a maximum trace while
210 * it continues examining live traces.
212 * The buffers for the max_buffer are set up the same as the trace_buffer
213 * When a snapshot is taken, the buffer of the max_buffer is swapped
214 * with the buffer of the trace_buffer and the buffers are reset for
215 * the trace_buffer so the tracing can continue.
217 struct trace_buffer max_buffer;
218 bool allocated_snapshot;
220 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
221 unsigned long max_latency;
223 struct trace_pid_list __rcu *filtered_pids;
225 * max_lock is used to protect the swapping of buffers
226 * when taking a max snapshot. The buffers themselves are
227 * protected by per_cpu spinlocks. But the action of the swap
228 * needs its own lock.
230 * This is defined as a arch_spinlock_t in order to help
231 * with performance when lockdep debugging is enabled.
233 * It is also used in other places outside the update_max_tr
234 * so it needs to be defined outside of the
235 * CONFIG_TRACER_MAX_TRACE.
237 arch_spinlock_t max_lock;
239 #ifdef CONFIG_FTRACE_SYSCALLS
240 int sys_refcount_enter;
241 int sys_refcount_exit;
242 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
243 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
249 struct tracer *current_trace;
250 unsigned int trace_flags;
251 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
253 raw_spinlock_t start_lock;
255 struct dentry *options;
256 struct dentry *percpu_dir;
257 struct dentry *event_dir;
258 struct trace_options *topts;
259 struct list_head systems;
260 struct list_head events;
261 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
263 #ifdef CONFIG_FUNCTION_TRACER
264 struct ftrace_ops *ops;
265 struct trace_pid_list __rcu *function_pids;
266 #ifdef CONFIG_DYNAMIC_FTRACE
267 /* All of these are protected by the ftrace_lock */
268 struct list_head func_probes;
269 struct list_head mod_trace;
270 struct list_head mod_notrace;
272 /* function tracing enabled */
273 int function_enabled;
278 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
281 extern struct list_head ftrace_trace_arrays;
283 extern struct mutex trace_types_lock;
285 extern int trace_array_get(struct trace_array *tr);
286 extern void trace_array_put(struct trace_array *tr);
289 * The global tracer (top) should be the first trace array added,
290 * but we check the flag anyway.
292 static inline struct trace_array *top_trace_array(void)
294 struct trace_array *tr;
296 if (list_empty(&ftrace_trace_arrays))
299 tr = list_entry(ftrace_trace_arrays.prev,
301 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
305 #define FTRACE_CMP_TYPE(var, type) \
306 __builtin_types_compatible_p(typeof(var), type *)
309 #define IF_ASSIGN(var, entry, etype, id) \
310 if (FTRACE_CMP_TYPE(var, etype)) { \
311 var = (typeof(var))(entry); \
312 WARN_ON(id && (entry)->type != id); \
316 /* Will cause compile errors if type is not found. */
317 extern void __ftrace_bad_type(void);
320 * The trace_assign_type is a verifier that the entry type is
321 * the same as the type being assigned. To add new types simply
322 * add a line with the following format:
324 * IF_ASSIGN(var, ent, type, id);
326 * Where "type" is the trace type that includes the trace_entry
327 * as the "ent" item. And "id" is the trace identifier that is
328 * used in the trace_type enum.
330 * If the type can have more than one id, then use zero.
332 #define trace_assign_type(var, ent) \
334 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
335 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
336 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
337 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
338 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
339 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
340 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
341 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
342 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
343 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
345 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
347 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
348 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
350 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
352 __ftrace_bad_type(); \
356 * An option specific to a tracer. This is a boolean value.
357 * The bit is the bit index that sets its value on the
358 * flags value in struct tracer_flags.
361 const char *name; /* Will appear on the trace_options file */
362 u32 bit; /* Mask assigned in val field in tracer_flags */
366 * The set of specific options for a tracer. Your tracer
367 * have to set the initial value of the flags val.
369 struct tracer_flags {
371 struct tracer_opt *opts;
372 struct tracer *trace;
375 /* Makes more easy to define a tracer opt */
376 #define TRACER_OPT(s, b) .name = #s, .bit = b
379 struct trace_option_dentry {
380 struct tracer_opt *opt;
381 struct tracer_flags *flags;
382 struct trace_array *tr;
383 struct dentry *entry;
387 * struct tracer - a specific tracer and its callbacks to interact with tracefs
388 * @name: the name chosen to select it on the available_tracers file
389 * @init: called when one switches to this tracer (echo name > current_tracer)
390 * @reset: called when one switches to another tracer
391 * @start: called when tracing is unpaused (echo 1 > tracing_on)
392 * @stop: called when tracing is paused (echo 0 > tracing_on)
393 * @update_thresh: called when tracing_thresh is updated
394 * @open: called when the trace file is opened
395 * @pipe_open: called when the trace_pipe file is opened
396 * @close: called when the trace file is released
397 * @pipe_close: called when the trace_pipe file is released
398 * @read: override the default read callback on trace_pipe
399 * @splice_read: override the default splice_read callback on trace_pipe
400 * @selftest: selftest to run on boot (see trace_selftest.c)
401 * @print_headers: override the first lines that describe your columns
402 * @print_line: callback that prints a trace
403 * @set_flag: signals one of your private flags changed (trace_options file)
404 * @flags: your private flags
408 int (*init)(struct trace_array *tr);
409 void (*reset)(struct trace_array *tr);
410 void (*start)(struct trace_array *tr);
411 void (*stop)(struct trace_array *tr);
412 int (*update_thresh)(struct trace_array *tr);
413 void (*open)(struct trace_iterator *iter);
414 void (*pipe_open)(struct trace_iterator *iter);
415 void (*close)(struct trace_iterator *iter);
416 void (*pipe_close)(struct trace_iterator *iter);
417 ssize_t (*read)(struct trace_iterator *iter,
418 struct file *filp, char __user *ubuf,
419 size_t cnt, loff_t *ppos);
420 ssize_t (*splice_read)(struct trace_iterator *iter,
423 struct pipe_inode_info *pipe,
426 #ifdef CONFIG_FTRACE_STARTUP_TEST
427 int (*selftest)(struct tracer *trace,
428 struct trace_array *tr);
430 void (*print_header)(struct seq_file *m);
431 enum print_line_t (*print_line)(struct trace_iterator *iter);
432 /* If you handled the flag setting, return 0 */
433 int (*set_flag)(struct trace_array *tr,
434 u32 old_flags, u32 bit, int set);
435 /* Return 0 if OK with change, else return non-zero */
436 int (*flag_changed)(struct trace_array *tr,
439 struct tracer_flags *flags;
443 bool allow_instances;
444 #ifdef CONFIG_TRACER_MAX_TRACE
447 /* True if tracer cannot be enabled in kernel param */
452 /* Only current can touch trace_recursion */
455 * For function tracing recursion:
456 * The order of these bits are important.
458 * When function tracing occurs, the following steps are made:
459 * If arch does not support a ftrace feature:
460 * call internal function (uses INTERNAL bits) which calls...
461 * If callback is registered to the "global" list, the list
462 * function is called and recursion checks the GLOBAL bits.
463 * then this function calls...
464 * The function callback, which can use the FTRACE bits to
465 * check for recursion.
467 * Now if the arch does not suppport a feature, and it calls
468 * the global list function which calls the ftrace callback
469 * all three of these steps will do a recursion protection.
470 * There's no reason to do one if the previous caller already
471 * did. The recursion that we are protecting against will
472 * go through the same steps again.
474 * To prevent the multiple recursion checks, if a recursion
475 * bit is set that is higher than the MAX bit of the current
476 * check, then we know that the check was made by the previous
477 * caller, and we can skip the current check.
481 TRACE_BUFFER_NMI_BIT,
482 TRACE_BUFFER_IRQ_BIT,
483 TRACE_BUFFER_SIRQ_BIT,
485 /* Start of function recursion bits */
487 TRACE_FTRACE_NMI_BIT,
488 TRACE_FTRACE_IRQ_BIT,
489 TRACE_FTRACE_SIRQ_BIT,
491 /* INTERNAL_BITs must be greater than FTRACE_BITs */
493 TRACE_INTERNAL_NMI_BIT,
494 TRACE_INTERNAL_IRQ_BIT,
495 TRACE_INTERNAL_SIRQ_BIT,
499 * Abuse of the trace_recursion.
500 * As we need a way to maintain state if we are tracing the function
501 * graph in irq because we want to trace a particular function that
502 * was called in irq context but we have irq tracing off. Since this
503 * can only be modified by current, we can reuse trace_recursion.
508 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
509 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
510 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
512 #define TRACE_CONTEXT_BITS 4
514 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
515 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
517 #define TRACE_LIST_START TRACE_INTERNAL_BIT
518 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
520 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
522 static __always_inline int trace_get_context_bit(void)
526 if (in_interrupt()) {
540 static __always_inline int trace_test_and_set_recursion(int start, int max)
542 unsigned int val = current->trace_recursion;
545 /* A previous recursion check was made */
546 if ((val & TRACE_CONTEXT_MASK) > max)
549 bit = trace_get_context_bit() + start;
550 if (unlikely(val & (1 << bit)))
554 current->trace_recursion = val;
560 static __always_inline void trace_clear_recursion(int bit)
562 unsigned int val = current->trace_recursion;
571 current->trace_recursion = val;
574 static inline struct ring_buffer_iter *
575 trace_buffer_iter(struct trace_iterator *iter, int cpu)
577 if (iter->buffer_iter && iter->buffer_iter[cpu])
578 return iter->buffer_iter[cpu];
582 int tracer_init(struct tracer *t, struct trace_array *tr);
583 int tracing_is_enabled(void);
584 void tracing_reset(struct trace_buffer *buf, int cpu);
585 void tracing_reset_online_cpus(struct trace_buffer *buf);
586 void tracing_reset_current(int cpu);
587 void tracing_reset_all_online_cpus(void);
588 int tracing_open_generic(struct inode *inode, struct file *filp);
589 bool tracing_is_disabled(void);
590 int tracer_tracing_is_on(struct trace_array *tr);
591 void tracer_tracing_on(struct trace_array *tr);
592 void tracer_tracing_off(struct trace_array *tr);
593 struct dentry *trace_create_file(const char *name,
595 struct dentry *parent,
597 const struct file_operations *fops);
599 struct dentry *tracing_init_dentry(void);
601 struct ring_buffer_event;
603 struct ring_buffer_event *
604 trace_buffer_lock_reserve(struct ring_buffer *buffer,
610 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
611 struct trace_array_cpu *data);
613 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
614 int *ent_cpu, u64 *ent_ts);
616 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer,
617 struct ring_buffer_event *event);
619 int trace_empty(struct trace_iterator *iter);
621 void *trace_find_next_entry_inc(struct trace_iterator *iter);
623 void trace_init_global_iter(struct trace_iterator *iter);
625 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
627 void trace_function(struct trace_array *tr,
629 unsigned long parent_ip,
630 unsigned long flags, int pc);
631 void trace_graph_function(struct trace_array *tr,
633 unsigned long parent_ip,
634 unsigned long flags, int pc);
635 void trace_latency_header(struct seq_file *m);
636 void trace_default_header(struct seq_file *m);
637 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
638 int trace_empty(struct trace_iterator *iter);
640 void trace_graph_return(struct ftrace_graph_ret *trace);
641 int trace_graph_entry(struct ftrace_graph_ent *trace);
642 void set_graph_array(struct trace_array *tr);
644 void tracing_start_cmdline_record(void);
645 void tracing_stop_cmdline_record(void);
646 void tracing_start_tgid_record(void);
647 void tracing_stop_tgid_record(void);
649 int register_tracer(struct tracer *type);
650 int is_tracing_stopped(void);
652 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
654 extern cpumask_var_t __read_mostly tracing_buffer_mask;
656 #define for_each_tracing_cpu(cpu) \
657 for_each_cpu(cpu, tracing_buffer_mask)
659 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
661 extern unsigned long tracing_thresh;
667 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
669 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
670 struct task_struct *task);
671 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
672 struct task_struct *self,
673 struct task_struct *task);
674 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
675 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
676 int trace_pid_show(struct seq_file *m, void *v);
677 void trace_free_pid_list(struct trace_pid_list *pid_list);
678 int trace_pid_write(struct trace_pid_list *filtered_pids,
679 struct trace_pid_list **new_pid_list,
680 const char __user *ubuf, size_t cnt);
682 #ifdef CONFIG_TRACER_MAX_TRACE
683 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
684 void update_max_tr_single(struct trace_array *tr,
685 struct task_struct *tsk, int cpu);
686 #endif /* CONFIG_TRACER_MAX_TRACE */
688 #ifdef CONFIG_STACKTRACE
689 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
692 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
695 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
696 unsigned long flags, int pc)
700 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
704 #endif /* CONFIG_STACKTRACE */
706 extern u64 ftrace_now(int cpu);
708 extern void trace_find_cmdline(int pid, char comm[]);
709 extern int trace_find_tgid(int pid);
710 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
712 #ifdef CONFIG_DYNAMIC_FTRACE
713 extern unsigned long ftrace_update_tot_cnt;
714 void ftrace_init_trace_array(struct trace_array *tr);
716 static inline void ftrace_init_trace_array(struct trace_array *tr) { }
718 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
719 extern int DYN_FTRACE_TEST_NAME(void);
720 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
721 extern int DYN_FTRACE_TEST_NAME2(void);
723 extern bool ring_buffer_expanded;
724 extern bool tracing_selftest_disabled;
726 #ifdef CONFIG_FTRACE_STARTUP_TEST
727 extern int trace_selftest_startup_function(struct tracer *trace,
728 struct trace_array *tr);
729 extern int trace_selftest_startup_function_graph(struct tracer *trace,
730 struct trace_array *tr);
731 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
732 struct trace_array *tr);
733 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
734 struct trace_array *tr);
735 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
736 struct trace_array *tr);
737 extern int trace_selftest_startup_wakeup(struct tracer *trace,
738 struct trace_array *tr);
739 extern int trace_selftest_startup_nop(struct tracer *trace,
740 struct trace_array *tr);
741 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
742 struct trace_array *tr);
743 extern int trace_selftest_startup_branch(struct tracer *trace,
744 struct trace_array *tr);
746 * Tracer data references selftest functions that only occur
747 * on boot up. These can be __init functions. Thus, when selftests
748 * are enabled, then the tracers need to reference __init functions.
750 #define __tracer_data __refdata
752 /* Tracers are seldom changed. Optimize when selftests are disabled. */
753 #define __tracer_data __read_mostly
754 #endif /* CONFIG_FTRACE_STARTUP_TEST */
756 extern void *head_page(struct trace_array_cpu *data);
757 extern unsigned long long ns2usecs(u64 nsec);
759 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
761 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
763 trace_array_vprintk(struct trace_array *tr,
764 unsigned long ip, const char *fmt, va_list args);
765 int trace_array_printk(struct trace_array *tr,
766 unsigned long ip, const char *fmt, ...);
767 int trace_array_printk_buf(struct ring_buffer *buffer,
768 unsigned long ip, const char *fmt, ...);
769 void trace_printk_seq(struct trace_seq *s);
770 enum print_line_t print_trace_line(struct trace_iterator *iter);
772 extern char trace_find_mark(unsigned long long duration);
776 struct ftrace_mod_load {
777 struct list_head list;
784 FTRACE_HASH_FL_MOD = (1 << 0),
788 unsigned long size_bits;
789 struct hlist_head *buckets;
795 struct ftrace_func_entry *
796 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
798 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
800 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
803 /* Standard output formatting function used for function return traces */
804 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
807 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
808 #define TRACE_GRAPH_PRINT_CPU 0x2
809 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
810 #define TRACE_GRAPH_PRINT_PROC 0x8
811 #define TRACE_GRAPH_PRINT_DURATION 0x10
812 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
813 #define TRACE_GRAPH_PRINT_IRQS 0x40
814 #define TRACE_GRAPH_PRINT_TAIL 0x80
815 #define TRACE_GRAPH_SLEEP_TIME 0x100
816 #define TRACE_GRAPH_GRAPH_TIME 0x200
817 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
818 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
820 extern void ftrace_graph_sleep_time_control(bool enable);
821 extern void ftrace_graph_graph_time_control(bool enable);
823 extern enum print_line_t
824 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
825 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
827 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
828 extern void graph_trace_open(struct trace_iterator *iter);
829 extern void graph_trace_close(struct trace_iterator *iter);
830 extern int __trace_graph_entry(struct trace_array *tr,
831 struct ftrace_graph_ent *trace,
832 unsigned long flags, int pc);
833 extern void __trace_graph_return(struct trace_array *tr,
834 struct ftrace_graph_ret *trace,
835 unsigned long flags, int pc);
837 #ifdef CONFIG_DYNAMIC_FTRACE
838 extern struct ftrace_hash *ftrace_graph_hash;
839 extern struct ftrace_hash *ftrace_graph_notrace_hash;
841 static inline int ftrace_graph_addr(unsigned long addr)
845 preempt_disable_notrace();
847 if (ftrace_hash_empty(ftrace_graph_hash)) {
852 if (ftrace_lookup_ip(ftrace_graph_hash, addr)) {
854 * If no irqs are to be traced, but a set_graph_function
855 * is set, and called by an interrupt handler, we still
859 trace_recursion_set(TRACE_IRQ_BIT);
861 trace_recursion_clear(TRACE_IRQ_BIT);
866 preempt_enable_notrace();
870 static inline int ftrace_graph_notrace_addr(unsigned long addr)
874 preempt_disable_notrace();
876 if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr))
879 preempt_enable_notrace();
883 static inline int ftrace_graph_addr(unsigned long addr)
888 static inline int ftrace_graph_notrace_addr(unsigned long addr)
892 #endif /* CONFIG_DYNAMIC_FTRACE */
894 extern unsigned int fgraph_max_depth;
896 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
898 /* trace it when it is-nested-in or is a function enabled. */
899 return !(trace->depth || ftrace_graph_addr(trace->func)) ||
900 (trace->depth < 0) ||
901 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
904 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
905 static inline enum print_line_t
906 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
908 return TRACE_TYPE_UNHANDLED;
910 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
912 extern struct list_head ftrace_pids;
914 #ifdef CONFIG_FUNCTION_TRACER
915 struct ftrace_func_command {
916 struct list_head list;
918 int (*func)(struct trace_array *tr,
919 struct ftrace_hash *hash,
920 char *func, char *cmd,
921 char *params, int enable);
923 extern bool ftrace_filter_param __initdata;
924 static inline int ftrace_trace_task(struct trace_array *tr)
926 return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid);
928 extern int ftrace_is_dead(void);
929 int ftrace_create_function_files(struct trace_array *tr,
930 struct dentry *parent);
931 void ftrace_destroy_function_files(struct trace_array *tr);
932 void ftrace_init_global_array_ops(struct trace_array *tr);
933 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
934 void ftrace_reset_array_ops(struct trace_array *tr);
935 int using_ftrace_ops_list_func(void);
936 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
937 void ftrace_init_tracefs_toplevel(struct trace_array *tr,
938 struct dentry *d_tracer);
939 void ftrace_clear_pids(struct trace_array *tr);
940 int init_function_trace(void);
941 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
943 static inline int ftrace_trace_task(struct trace_array *tr)
947 static inline int ftrace_is_dead(void) { return 0; }
949 ftrace_create_function_files(struct trace_array *tr,
950 struct dentry *parent)
954 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
955 static inline __init void
956 ftrace_init_global_array_ops(struct trace_array *tr) { }
957 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
958 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
959 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
960 static inline void ftrace_clear_pids(struct trace_array *tr) { }
961 static inline int init_function_trace(void) { return 0; }
962 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
963 /* ftace_func_t type is not defined, use macro instead of static inline */
964 #define ftrace_init_array_ops(tr, func) do { } while (0)
965 #endif /* CONFIG_FUNCTION_TRACER */
967 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
969 struct ftrace_probe_ops {
970 void (*func)(unsigned long ip,
971 unsigned long parent_ip,
972 struct trace_array *tr,
973 struct ftrace_probe_ops *ops,
975 int (*init)(struct ftrace_probe_ops *ops,
976 struct trace_array *tr,
977 unsigned long ip, void *init_data,
979 void (*free)(struct ftrace_probe_ops *ops,
980 struct trace_array *tr,
981 unsigned long ip, void *data);
982 int (*print)(struct seq_file *m,
984 struct ftrace_probe_ops *ops,
988 struct ftrace_func_mapper;
989 typedef int (*ftrace_mapper_func)(void *data);
991 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
992 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
994 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
995 unsigned long ip, void *data);
996 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
998 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
999 ftrace_mapper_func free_func);
1002 register_ftrace_function_probe(char *glob, struct trace_array *tr,
1003 struct ftrace_probe_ops *ops, void *data);
1005 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1006 struct ftrace_probe_ops *ops);
1007 extern void clear_ftrace_function_probes(struct trace_array *tr);
1009 int register_ftrace_command(struct ftrace_func_command *cmd);
1010 int unregister_ftrace_command(struct ftrace_func_command *cmd);
1012 void ftrace_create_filter_files(struct ftrace_ops *ops,
1013 struct dentry *parent);
1014 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1016 struct ftrace_func_command;
1018 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1022 static inline __init int unregister_ftrace_command(char *cmd_name)
1026 static inline void clear_ftrace_function_probes(struct trace_array *tr)
1031 * The ops parameter passed in is usually undefined.
1032 * This must be a macro.
1034 #define ftrace_create_filter_files(ops, parent) do { } while (0)
1035 #define ftrace_destroy_filter_files(ops) do { } while (0)
1036 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1038 bool ftrace_event_is_function(struct trace_event_call *call);
1041 * struct trace_parser - servers for reading the user input separated by spaces
1042 * @cont: set if the input is not complete - no final space char was found
1043 * @buffer: holds the parsed user input
1044 * @idx: user input length
1045 * @size: buffer size
1047 struct trace_parser {
1054 static inline bool trace_parser_loaded(struct trace_parser *parser)
1056 return (parser->idx != 0);
1059 static inline bool trace_parser_cont(struct trace_parser *parser)
1061 return parser->cont;
1064 static inline void trace_parser_clear(struct trace_parser *parser)
1066 parser->cont = false;
1070 extern int trace_parser_get_init(struct trace_parser *parser, int size);
1071 extern void trace_parser_put(struct trace_parser *parser);
1072 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1073 size_t cnt, loff_t *ppos);
1076 * Only create function graph options if function graph is configured.
1078 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1079 # define FGRAPH_FLAGS \
1080 C(DISPLAY_GRAPH, "display-graph"),
1082 # define FGRAPH_FLAGS
1085 #ifdef CONFIG_BRANCH_TRACER
1086 # define BRANCH_FLAGS \
1087 C(BRANCH, "branch"),
1089 # define BRANCH_FLAGS
1092 #ifdef CONFIG_FUNCTION_TRACER
1093 # define FUNCTION_FLAGS \
1094 C(FUNCTION, "function-trace"), \
1095 C(FUNC_FORK, "function-fork"),
1096 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1098 # define FUNCTION_FLAGS
1099 # define FUNCTION_DEFAULT_FLAGS 0UL
1100 # define TRACE_ITER_FUNC_FORK 0UL
1103 #ifdef CONFIG_STACKTRACE
1104 # define STACK_FLAGS \
1105 C(STACKTRACE, "stacktrace"),
1107 # define STACK_FLAGS
1111 * trace_iterator_flags is an enumeration that defines bit
1112 * positions into trace_flags that controls the output.
1114 * NOTE: These bits must match the trace_options array in
1115 * trace.c (this macro guarantees it).
1117 #define TRACE_FLAGS \
1118 C(PRINT_PARENT, "print-parent"), \
1119 C(SYM_OFFSET, "sym-offset"), \
1120 C(SYM_ADDR, "sym-addr"), \
1121 C(VERBOSE, "verbose"), \
1125 C(BLOCK, "block"), \
1126 C(PRINTK, "trace_printk"), \
1127 C(ANNOTATE, "annotate"), \
1128 C(USERSTACKTRACE, "userstacktrace"), \
1129 C(SYM_USEROBJ, "sym-userobj"), \
1130 C(PRINTK_MSGONLY, "printk-msg-only"), \
1131 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1132 C(LATENCY_FMT, "latency-format"), \
1133 C(RECORD_CMD, "record-cmd"), \
1134 C(RECORD_TGID, "record-tgid"), \
1135 C(OVERWRITE, "overwrite"), \
1136 C(STOP_ON_FREE, "disable_on_free"), \
1137 C(IRQ_INFO, "irq-info"), \
1138 C(MARKERS, "markers"), \
1139 C(EVENT_FORK, "event-fork"), \
1146 * By defining C, we can make TRACE_FLAGS a list of bit names
1147 * that will define the bits for the flag masks.
1150 #define C(a, b) TRACE_ITER_##a##_BIT
1152 enum trace_iterator_bits {
1154 /* Make sure we don't go more than we have bits for */
1159 * By redefining C, we can make TRACE_FLAGS a list of masks that
1160 * use the bits as defined above.
1163 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1165 enum trace_iterator_flags { TRACE_FLAGS };
1168 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1169 * control the output of kernel symbols.
1171 #define TRACE_ITER_SYM_MASK \
1172 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1174 extern struct tracer nop_trace;
1176 #ifdef CONFIG_BRANCH_TRACER
1177 extern int enable_branch_tracing(struct trace_array *tr);
1178 extern void disable_branch_tracing(void);
1179 static inline int trace_branch_enable(struct trace_array *tr)
1181 if (tr->trace_flags & TRACE_ITER_BRANCH)
1182 return enable_branch_tracing(tr);
1185 static inline void trace_branch_disable(void)
1187 /* due to races, always disable */
1188 disable_branch_tracing();
1191 static inline int trace_branch_enable(struct trace_array *tr)
1195 static inline void trace_branch_disable(void)
1198 #endif /* CONFIG_BRANCH_TRACER */
1200 /* set ring buffers to default size if not already done so */
1201 int tracing_update_buffers(void);
1203 struct ftrace_event_field {
1204 struct list_head link;
1213 struct event_filter {
1214 int n_preds; /* Number assigned */
1215 int a_preds; /* allocated */
1216 struct filter_pred __rcu *preds;
1217 struct filter_pred __rcu *root;
1218 char *filter_string;
1221 struct event_subsystem {
1222 struct list_head list;
1224 struct event_filter *filter;
1228 struct trace_subsystem_dir {
1229 struct list_head list;
1230 struct event_subsystem *subsystem;
1231 struct trace_array *tr;
1232 struct dentry *entry;
1237 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1238 struct ring_buffer *buffer,
1239 struct ring_buffer_event *event);
1241 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1242 struct ring_buffer *buffer,
1243 struct ring_buffer_event *event,
1244 unsigned long flags, int pc,
1245 struct pt_regs *regs);
1247 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1248 struct ring_buffer *buffer,
1249 struct ring_buffer_event *event,
1250 unsigned long flags, int pc)
1252 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
1255 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1256 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1257 void trace_buffered_event_disable(void);
1258 void trace_buffered_event_enable(void);
1261 __trace_event_discard_commit(struct ring_buffer *buffer,
1262 struct ring_buffer_event *event)
1264 if (this_cpu_read(trace_buffered_event) == event) {
1265 /* Simply release the temp buffer */
1266 this_cpu_dec(trace_buffered_event_cnt);
1269 ring_buffer_discard_commit(buffer, event);
1273 * Helper function for event_trigger_unlock_commit{_regs}().
1274 * If there are event triggers attached to this event that requires
1275 * filtering against its fields, then they wil be called as the
1276 * entry already holds the field information of the current event.
1278 * It also checks if the event should be discarded or not.
1279 * It is to be discarded if the event is soft disabled and the
1280 * event was only recorded to process triggers, or if the event
1281 * filter is active and this event did not match the filters.
1283 * Returns true if the event is discarded, false otherwise.
1286 __event_trigger_test_discard(struct trace_event_file *file,
1287 struct ring_buffer *buffer,
1288 struct ring_buffer_event *event,
1290 enum event_trigger_type *tt)
1292 unsigned long eflags = file->flags;
1294 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1295 *tt = event_triggers_call(file, entry);
1297 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1298 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1299 !filter_match_preds(file->filter, entry))) {
1300 __trace_event_discard_commit(buffer, event);
1308 * event_trigger_unlock_commit - handle triggers and finish event commit
1309 * @file: The file pointer assoctiated to the event
1310 * @buffer: The ring buffer that the event is being written to
1311 * @event: The event meta data in the ring buffer
1312 * @entry: The event itself
1313 * @irq_flags: The state of the interrupts at the start of the event
1314 * @pc: The state of the preempt count at the start of the event.
1316 * This is a helper function to handle triggers that require data
1317 * from the event itself. It also tests the event against filters and
1318 * if the event is soft disabled and should be discarded.
1321 event_trigger_unlock_commit(struct trace_event_file *file,
1322 struct ring_buffer *buffer,
1323 struct ring_buffer_event *event,
1324 void *entry, unsigned long irq_flags, int pc)
1326 enum event_trigger_type tt = ETT_NONE;
1328 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1329 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
1332 event_triggers_post_call(file, tt, entry);
1336 * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1337 * @file: The file pointer assoctiated to the event
1338 * @buffer: The ring buffer that the event is being written to
1339 * @event: The event meta data in the ring buffer
1340 * @entry: The event itself
1341 * @irq_flags: The state of the interrupts at the start of the event
1342 * @pc: The state of the preempt count at the start of the event.
1344 * This is a helper function to handle triggers that require data
1345 * from the event itself. It also tests the event against filters and
1346 * if the event is soft disabled and should be discarded.
1348 * Same as event_trigger_unlock_commit() but calls
1349 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1352 event_trigger_unlock_commit_regs(struct trace_event_file *file,
1353 struct ring_buffer *buffer,
1354 struct ring_buffer_event *event,
1355 void *entry, unsigned long irq_flags, int pc,
1356 struct pt_regs *regs)
1358 enum event_trigger_type tt = ETT_NONE;
1360 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1361 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1362 irq_flags, pc, regs);
1365 event_triggers_post_call(file, tt, entry);
1368 #define FILTER_PRED_INVALID ((unsigned short)-1)
1369 #define FILTER_PRED_IS_RIGHT (1 << 15)
1370 #define FILTER_PRED_FOLD (1 << 15)
1373 * The max preds is the size of unsigned short with
1374 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1375 * and FOLD flags. The other is reserved.
1377 * 2^14 preds is way more than enough.
1379 #define MAX_FILTER_PRED 16384
1384 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1386 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1397 char pattern[MAX_FILTER_STR_VAL];
1400 regex_match_func match;
1403 struct filter_pred {
1404 filter_pred_fn_t fn;
1407 unsigned short *ops;
1408 struct ftrace_event_field *field;
1412 unsigned short index;
1413 unsigned short parent;
1414 unsigned short left;
1415 unsigned short right;
1418 static inline bool is_string_field(struct ftrace_event_field *field)
1420 return field->filter_type == FILTER_DYN_STRING ||
1421 field->filter_type == FILTER_STATIC_STRING ||
1422 field->filter_type == FILTER_PTR_STRING ||
1423 field->filter_type == FILTER_COMM;
1426 static inline bool is_function_field(struct ftrace_event_field *field)
1428 return field->filter_type == FILTER_TRACE_FN;
1431 extern enum regex_type
1432 filter_parse_regex(char *buff, int len, char **search, int *not);
1433 extern void print_event_filter(struct trace_event_file *file,
1434 struct trace_seq *s);
1435 extern int apply_event_filter(struct trace_event_file *file,
1436 char *filter_string);
1437 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1438 char *filter_string);
1439 extern void print_subsystem_event_filter(struct event_subsystem *system,
1440 struct trace_seq *s);
1441 extern int filter_assign_type(const char *type);
1442 extern int create_event_filter(struct trace_event_call *call,
1443 char *filter_str, bool set_str,
1444 struct event_filter **filterp);
1445 extern void free_event_filter(struct event_filter *filter);
1447 struct ftrace_event_field *
1448 trace_find_event_field(struct trace_event_call *call, char *name);
1450 extern void trace_event_enable_cmd_record(bool enable);
1451 extern void trace_event_enable_tgid_record(bool enable);
1453 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1454 extern int event_trace_del_tracer(struct trace_array *tr);
1456 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1460 static inline void *event_file_data(struct file *filp)
1462 return ACCESS_ONCE(file_inode(filp)->i_private);
1465 extern struct mutex event_mutex;
1466 extern struct list_head ftrace_events;
1468 extern const struct file_operations event_trigger_fops;
1469 extern const struct file_operations event_hist_fops;
1471 #ifdef CONFIG_HIST_TRIGGERS
1472 extern int register_trigger_hist_cmd(void);
1473 extern int register_trigger_hist_enable_disable_cmds(void);
1475 static inline int register_trigger_hist_cmd(void) { return 0; }
1476 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1479 extern int register_trigger_cmds(void);
1480 extern void clear_event_triggers(struct trace_array *tr);
1482 struct event_trigger_data {
1483 unsigned long count;
1485 struct event_trigger_ops *ops;
1486 struct event_command *cmd_ops;
1487 struct event_filter __rcu *filter;
1492 struct list_head list;
1494 struct list_head named_list;
1495 struct event_trigger_data *named_data;
1499 #define ENABLE_EVENT_STR "enable_event"
1500 #define DISABLE_EVENT_STR "disable_event"
1501 #define ENABLE_HIST_STR "enable_hist"
1502 #define DISABLE_HIST_STR "disable_hist"
1504 struct enable_trigger_data {
1505 struct trace_event_file *file;
1510 extern int event_enable_trigger_print(struct seq_file *m,
1511 struct event_trigger_ops *ops,
1512 struct event_trigger_data *data);
1513 extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1514 struct event_trigger_data *data);
1515 extern int event_enable_trigger_func(struct event_command *cmd_ops,
1516 struct trace_event_file *file,
1517 char *glob, char *cmd, char *param);
1518 extern int event_enable_register_trigger(char *glob,
1519 struct event_trigger_ops *ops,
1520 struct event_trigger_data *data,
1521 struct trace_event_file *file);
1522 extern void event_enable_unregister_trigger(char *glob,
1523 struct event_trigger_ops *ops,
1524 struct event_trigger_data *test,
1525 struct trace_event_file *file);
1526 extern void trigger_data_free(struct event_trigger_data *data);
1527 extern int event_trigger_init(struct event_trigger_ops *ops,
1528 struct event_trigger_data *data);
1529 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1530 int trigger_enable);
1531 extern void update_cond_flag(struct trace_event_file *file);
1532 extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
1533 struct event_trigger_data *test,
1534 struct trace_event_file *file);
1535 extern int set_trigger_filter(char *filter_str,
1536 struct event_trigger_data *trigger_data,
1537 struct trace_event_file *file);
1538 extern struct event_trigger_data *find_named_trigger(const char *name);
1539 extern bool is_named_trigger(struct event_trigger_data *test);
1540 extern int save_named_trigger(const char *name,
1541 struct event_trigger_data *data);
1542 extern void del_named_trigger(struct event_trigger_data *data);
1543 extern void pause_named_trigger(struct event_trigger_data *data);
1544 extern void unpause_named_trigger(struct event_trigger_data *data);
1545 extern void set_named_trigger_data(struct event_trigger_data *data,
1546 struct event_trigger_data *named_data);
1547 extern int register_event_command(struct event_command *cmd);
1548 extern int unregister_event_command(struct event_command *cmd);
1549 extern int register_trigger_hist_enable_disable_cmds(void);
1552 * struct event_trigger_ops - callbacks for trace event triggers
1554 * The methods in this structure provide per-event trigger hooks for
1555 * various trigger operations.
1557 * All the methods below, except for @init() and @free(), must be
1560 * @func: The trigger 'probe' function called when the triggering
1561 * event occurs. The data passed into this callback is the data
1562 * that was supplied to the event_command @reg() function that
1563 * registered the trigger (see struct event_command) along with
1564 * the trace record, rec.
1566 * @init: An optional initialization function called for the trigger
1567 * when the trigger is registered (via the event_command reg()
1568 * function). This can be used to perform per-trigger
1569 * initialization such as incrementing a per-trigger reference
1570 * count, for instance. This is usually implemented by the
1571 * generic utility function @event_trigger_init() (see
1572 * trace_event_triggers.c).
1574 * @free: An optional de-initialization function called for the
1575 * trigger when the trigger is unregistered (via the
1576 * event_command @reg() function). This can be used to perform
1577 * per-trigger de-initialization such as decrementing a
1578 * per-trigger reference count and freeing corresponding trigger
1579 * data, for instance. This is usually implemented by the
1580 * generic utility function @event_trigger_free() (see
1581 * trace_event_triggers.c).
1583 * @print: The callback function invoked to have the trigger print
1584 * itself. This is usually implemented by a wrapper function
1585 * that calls the generic utility function @event_trigger_print()
1586 * (see trace_event_triggers.c).
1588 struct event_trigger_ops {
1589 void (*func)(struct event_trigger_data *data,
1591 int (*init)(struct event_trigger_ops *ops,
1592 struct event_trigger_data *data);
1593 void (*free)(struct event_trigger_ops *ops,
1594 struct event_trigger_data *data);
1595 int (*print)(struct seq_file *m,
1596 struct event_trigger_ops *ops,
1597 struct event_trigger_data *data);
1601 * struct event_command - callbacks and data members for event commands
1603 * Event commands are invoked by users by writing the command name
1604 * into the 'trigger' file associated with a trace event. The
1605 * parameters associated with a specific invocation of an event
1606 * command are used to create an event trigger instance, which is
1607 * added to the list of trigger instances associated with that trace
1608 * event. When the event is hit, the set of triggers associated with
1609 * that event is invoked.
1611 * The data members in this structure provide per-event command data
1612 * for various event commands.
1614 * All the data members below, except for @post_trigger, must be set
1615 * for each event command.
1617 * @name: The unique name that identifies the event command. This is
1618 * the name used when setting triggers via trigger files.
1620 * @trigger_type: A unique id that identifies the event command
1621 * 'type'. This value has two purposes, the first to ensure that
1622 * only one trigger of the same type can be set at a given time
1623 * for a particular event e.g. it doesn't make sense to have both
1624 * a traceon and traceoff trigger attached to a single event at
1625 * the same time, so traceon and traceoff have the same type
1626 * though they have different names. The @trigger_type value is
1627 * also used as a bit value for deferring the actual trigger
1628 * action until after the current event is finished. Some
1629 * commands need to do this if they themselves log to the trace
1630 * buffer (see the @post_trigger() member below). @trigger_type
1631 * values are defined by adding new values to the trigger_type
1632 * enum in include/linux/trace_events.h.
1634 * @flags: See the enum event_command_flags below.
1636 * All the methods below, except for @set_filter() and @unreg_all(),
1637 * must be implemented.
1639 * @func: The callback function responsible for parsing and
1640 * registering the trigger written to the 'trigger' file by the
1641 * user. It allocates the trigger instance and registers it with
1642 * the appropriate trace event. It makes use of the other
1643 * event_command callback functions to orchestrate this, and is
1644 * usually implemented by the generic utility function
1645 * @event_trigger_callback() (see trace_event_triggers.c).
1647 * @reg: Adds the trigger to the list of triggers associated with the
1648 * event, and enables the event trigger itself, after
1649 * initializing it (via the event_trigger_ops @init() function).
1650 * This is also where commands can use the @trigger_type value to
1651 * make the decision as to whether or not multiple instances of
1652 * the trigger should be allowed. This is usually implemented by
1653 * the generic utility function @register_trigger() (see
1654 * trace_event_triggers.c).
1656 * @unreg: Removes the trigger from the list of triggers associated
1657 * with the event, and disables the event trigger itself, after
1658 * initializing it (via the event_trigger_ops @free() function).
1659 * This is usually implemented by the generic utility function
1660 * @unregister_trigger() (see trace_event_triggers.c).
1662 * @unreg_all: An optional function called to remove all the triggers
1663 * from the list of triggers associated with the event. Called
1664 * when a trigger file is opened in truncate mode.
1666 * @set_filter: An optional function called to parse and set a filter
1667 * for the trigger. If no @set_filter() method is set for the
1668 * event command, filters set by the user for the command will be
1669 * ignored. This is usually implemented by the generic utility
1670 * function @set_trigger_filter() (see trace_event_triggers.c).
1672 * @get_trigger_ops: The callback function invoked to retrieve the
1673 * event_trigger_ops implementation associated with the command.
1675 struct event_command {
1676 struct list_head list;
1678 enum event_trigger_type trigger_type;
1680 int (*func)(struct event_command *cmd_ops,
1681 struct trace_event_file *file,
1682 char *glob, char *cmd, char *params);
1683 int (*reg)(char *glob,
1684 struct event_trigger_ops *ops,
1685 struct event_trigger_data *data,
1686 struct trace_event_file *file);
1687 void (*unreg)(char *glob,
1688 struct event_trigger_ops *ops,
1689 struct event_trigger_data *data,
1690 struct trace_event_file *file);
1691 void (*unreg_all)(struct trace_event_file *file);
1692 int (*set_filter)(char *filter_str,
1693 struct event_trigger_data *data,
1694 struct trace_event_file *file);
1695 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1699 * enum event_command_flags - flags for struct event_command
1701 * @POST_TRIGGER: A flag that says whether or not this command needs
1702 * to have its action delayed until after the current event has
1703 * been closed. Some triggers need to avoid being invoked while
1704 * an event is currently in the process of being logged, since
1705 * the trigger may itself log data into the trace buffer. Thus
1706 * we make sure the current event is committed before invoking
1707 * those triggers. To do that, the trigger invocation is split
1708 * in two - the first part checks the filter using the current
1709 * trace record; if a command has the @post_trigger flag set, it
1710 * sets a bit for itself in the return value, otherwise it
1711 * directly invokes the trigger. Once all commands have been
1712 * either invoked or set their return flag, the current record is
1713 * either committed or discarded. At that point, if any commands
1714 * have deferred their triggers, those commands are finally
1715 * invoked following the close of the current event. In other
1716 * words, if the event_trigger_ops @func() probe implementation
1717 * itself logs to the trace buffer, this flag should be set,
1718 * otherwise it can be left unspecified.
1720 * @NEEDS_REC: A flag that says whether or not this command needs
1721 * access to the trace record in order to perform its function,
1722 * regardless of whether or not it has a filter associated with
1723 * it (filters make a trigger require access to the trace record
1724 * but are not always present).
1726 enum event_command_flags {
1727 EVENT_CMD_FL_POST_TRIGGER = 1,
1728 EVENT_CMD_FL_NEEDS_REC = 2,
1731 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1733 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1736 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1738 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1741 extern int trace_event_enable_disable(struct trace_event_file *file,
1742 int enable, int soft_disable);
1743 extern int tracing_alloc_snapshot(void);
1745 extern const char *__start___trace_bprintk_fmt[];
1746 extern const char *__stop___trace_bprintk_fmt[];
1748 extern const char *__start___tracepoint_str[];
1749 extern const char *__stop___tracepoint_str[];
1751 void trace_printk_control(bool enabled);
1752 void trace_printk_init_buffers(void);
1753 void trace_printk_start_comm(void);
1754 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1755 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1758 * Normal trace_printk() and friends allocates special buffers
1759 * to do the manipulation, as well as saves the print formats
1760 * into sections to display. But the trace infrastructure wants
1761 * to use these without the added overhead at the price of being
1762 * a bit slower (used mainly for warnings, where we don't care
1763 * about performance). The internal_trace_puts() is for such
1766 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1769 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1770 extern struct trace_event_call \
1771 __aligned(4) event_##call;
1772 #undef FTRACE_ENTRY_DUP
1773 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1774 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1776 #undef FTRACE_ENTRY_PACKED
1777 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \
1778 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1781 #include "trace_entries.h"
1783 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1784 int perf_ftrace_event_register(struct trace_event_call *call,
1785 enum trace_reg type, void *data);
1787 #define perf_ftrace_event_register NULL
1790 #ifdef CONFIG_FTRACE_SYSCALLS
1791 void init_ftrace_syscalls(void);
1792 const char *get_syscall_name(int syscall);
1794 static inline void init_ftrace_syscalls(void) { }
1795 static inline const char *get_syscall_name(int syscall)
1801 #ifdef CONFIG_EVENT_TRACING
1802 void trace_event_init(void);
1803 void trace_event_eval_update(struct trace_eval_map **map, int len);
1805 static inline void __init trace_event_init(void) { }
1806 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1809 extern struct trace_iterator *tracepoint_print_iter;
1811 #endif /* _LINUX_KERNEL_TRACE_H */