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;
348 struct tracer *trace;
351 /* Makes more easy to define a tracer opt */
352 #define TRACER_OPT(s, b) .name = #s, .bit = b
355 struct trace_option_dentry {
356 struct tracer_opt *opt;
357 struct tracer_flags *flags;
358 struct trace_array *tr;
359 struct dentry *entry;
363 * struct tracer - a specific tracer and its callbacks to interact with tracefs
364 * @name: the name chosen to select it on the available_tracers file
365 * @init: called when one switches to this tracer (echo name > current_tracer)
366 * @reset: called when one switches to another tracer
367 * @start: called when tracing is unpaused (echo 1 > tracing_on)
368 * @stop: called when tracing is paused (echo 0 > tracing_on)
369 * @update_thresh: called when tracing_thresh is updated
370 * @open: called when the trace file is opened
371 * @pipe_open: called when the trace_pipe file is opened
372 * @close: called when the trace file is released
373 * @pipe_close: called when the trace_pipe file is released
374 * @read: override the default read callback on trace_pipe
375 * @splice_read: override the default splice_read callback on trace_pipe
376 * @selftest: selftest to run on boot (see trace_selftest.c)
377 * @print_headers: override the first lines that describe your columns
378 * @print_line: callback that prints a trace
379 * @set_flag: signals one of your private flags changed (trace_options file)
380 * @flags: your private flags
384 int (*init)(struct trace_array *tr);
385 void (*reset)(struct trace_array *tr);
386 void (*start)(struct trace_array *tr);
387 void (*stop)(struct trace_array *tr);
388 int (*update_thresh)(struct trace_array *tr);
389 void (*open)(struct trace_iterator *iter);
390 void (*pipe_open)(struct trace_iterator *iter);
391 void (*close)(struct trace_iterator *iter);
392 void (*pipe_close)(struct trace_iterator *iter);
393 ssize_t (*read)(struct trace_iterator *iter,
394 struct file *filp, char __user *ubuf,
395 size_t cnt, loff_t *ppos);
396 ssize_t (*splice_read)(struct trace_iterator *iter,
399 struct pipe_inode_info *pipe,
402 #ifdef CONFIG_FTRACE_STARTUP_TEST
403 int (*selftest)(struct tracer *trace,
404 struct trace_array *tr);
406 void (*print_header)(struct seq_file *m);
407 enum print_line_t (*print_line)(struct trace_iterator *iter);
408 /* If you handled the flag setting, return 0 */
409 int (*set_flag)(struct trace_array *tr,
410 u32 old_flags, u32 bit, int set);
411 /* Return 0 if OK with change, else return non-zero */
412 int (*flag_changed)(struct trace_array *tr,
415 struct tracer_flags *flags;
419 bool allow_instances;
420 #ifdef CONFIG_TRACER_MAX_TRACE
426 /* Only current can touch trace_recursion */
429 * For function tracing recursion:
430 * The order of these bits are important.
432 * When function tracing occurs, the following steps are made:
433 * If arch does not support a ftrace feature:
434 * call internal function (uses INTERNAL bits) which calls...
435 * If callback is registered to the "global" list, the list
436 * function is called and recursion checks the GLOBAL bits.
437 * then this function calls...
438 * The function callback, which can use the FTRACE bits to
439 * check for recursion.
441 * Now if the arch does not suppport a feature, and it calls
442 * the global list function which calls the ftrace callback
443 * all three of these steps will do a recursion protection.
444 * There's no reason to do one if the previous caller already
445 * did. The recursion that we are protecting against will
446 * go through the same steps again.
448 * To prevent the multiple recursion checks, if a recursion
449 * bit is set that is higher than the MAX bit of the current
450 * check, then we know that the check was made by the previous
451 * caller, and we can skip the current check.
455 TRACE_BUFFER_NMI_BIT,
456 TRACE_BUFFER_IRQ_BIT,
457 TRACE_BUFFER_SIRQ_BIT,
459 /* Start of function recursion bits */
461 TRACE_FTRACE_NMI_BIT,
462 TRACE_FTRACE_IRQ_BIT,
463 TRACE_FTRACE_SIRQ_BIT,
465 /* INTERNAL_BITs must be greater than FTRACE_BITs */
467 TRACE_INTERNAL_NMI_BIT,
468 TRACE_INTERNAL_IRQ_BIT,
469 TRACE_INTERNAL_SIRQ_BIT,
473 * Abuse of the trace_recursion.
474 * As we need a way to maintain state if we are tracing the function
475 * graph in irq because we want to trace a particular function that
476 * was called in irq context but we have irq tracing off. Since this
477 * can only be modified by current, we can reuse trace_recursion.
482 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
483 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
484 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
486 #define TRACE_CONTEXT_BITS 4
488 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
489 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
491 #define TRACE_LIST_START TRACE_INTERNAL_BIT
492 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
494 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
496 static __always_inline int trace_get_context_bit(void)
500 if (in_interrupt()) {
514 static __always_inline int trace_test_and_set_recursion(int start, int max)
516 unsigned int val = current->trace_recursion;
519 /* A previous recursion check was made */
520 if ((val & TRACE_CONTEXT_MASK) > max)
523 bit = trace_get_context_bit() + start;
524 if (unlikely(val & (1 << bit)))
528 current->trace_recursion = val;
534 static __always_inline void trace_clear_recursion(int bit)
536 unsigned int val = current->trace_recursion;
545 current->trace_recursion = val;
548 static inline struct ring_buffer_iter *
549 trace_buffer_iter(struct trace_iterator *iter, int cpu)
551 if (iter->buffer_iter && iter->buffer_iter[cpu])
552 return iter->buffer_iter[cpu];
556 int tracer_init(struct tracer *t, struct trace_array *tr);
557 int tracing_is_enabled(void);
558 void tracing_reset(struct trace_buffer *buf, int cpu);
559 void tracing_reset_online_cpus(struct trace_buffer *buf);
560 void tracing_reset_current(int cpu);
561 void tracing_reset_all_online_cpus(void);
562 int tracing_open_generic(struct inode *inode, struct file *filp);
563 bool tracing_is_disabled(void);
564 struct dentry *trace_create_file(const char *name,
566 struct dentry *parent,
568 const struct file_operations *fops);
570 struct dentry *tracing_init_dentry(void);
572 struct ring_buffer_event;
574 struct ring_buffer_event *
575 trace_buffer_lock_reserve(struct ring_buffer *buffer,
581 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
582 struct trace_array_cpu *data);
584 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
585 int *ent_cpu, u64 *ent_ts);
587 void __buffer_unlock_commit(struct ring_buffer *buffer,
588 struct ring_buffer_event *event);
590 int trace_empty(struct trace_iterator *iter);
592 void *trace_find_next_entry_inc(struct trace_iterator *iter);
594 void trace_init_global_iter(struct trace_iterator *iter);
596 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
598 void trace_function(struct trace_array *tr,
600 unsigned long parent_ip,
601 unsigned long flags, int pc);
602 void trace_graph_function(struct trace_array *tr,
604 unsigned long parent_ip,
605 unsigned long flags, int pc);
606 void trace_latency_header(struct seq_file *m);
607 void trace_default_header(struct seq_file *m);
608 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
609 int trace_empty(struct trace_iterator *iter);
611 void trace_graph_return(struct ftrace_graph_ret *trace);
612 int trace_graph_entry(struct ftrace_graph_ent *trace);
613 void set_graph_array(struct trace_array *tr);
615 void tracing_start_cmdline_record(void);
616 void tracing_stop_cmdline_record(void);
617 int register_tracer(struct tracer *type);
618 int is_tracing_stopped(void);
620 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
622 extern cpumask_var_t __read_mostly tracing_buffer_mask;
624 #define for_each_tracing_cpu(cpu) \
625 for_each_cpu(cpu, tracing_buffer_mask)
627 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
629 extern unsigned long tracing_thresh;
631 #ifdef CONFIG_TRACER_MAX_TRACE
632 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
633 void update_max_tr_single(struct trace_array *tr,
634 struct task_struct *tsk, int cpu);
635 #endif /* CONFIG_TRACER_MAX_TRACE */
637 #ifdef CONFIG_STACKTRACE
638 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
641 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
644 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
645 unsigned long flags, int pc)
649 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
653 #endif /* CONFIG_STACKTRACE */
655 extern cycle_t ftrace_now(int cpu);
657 extern void trace_find_cmdline(int pid, char comm[]);
659 #ifdef CONFIG_DYNAMIC_FTRACE
660 extern unsigned long ftrace_update_tot_cnt;
662 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
663 extern int DYN_FTRACE_TEST_NAME(void);
664 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
665 extern int DYN_FTRACE_TEST_NAME2(void);
667 extern bool ring_buffer_expanded;
668 extern bool tracing_selftest_disabled;
670 #ifdef CONFIG_FTRACE_STARTUP_TEST
671 extern int trace_selftest_startup_function(struct tracer *trace,
672 struct trace_array *tr);
673 extern int trace_selftest_startup_function_graph(struct tracer *trace,
674 struct trace_array *tr);
675 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
676 struct trace_array *tr);
677 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
678 struct trace_array *tr);
679 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
680 struct trace_array *tr);
681 extern int trace_selftest_startup_wakeup(struct tracer *trace,
682 struct trace_array *tr);
683 extern int trace_selftest_startup_nop(struct tracer *trace,
684 struct trace_array *tr);
685 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
686 struct trace_array *tr);
687 extern int trace_selftest_startup_branch(struct tracer *trace,
688 struct trace_array *tr);
690 * Tracer data references selftest functions that only occur
691 * on boot up. These can be __init functions. Thus, when selftests
692 * are enabled, then the tracers need to reference __init functions.
694 #define __tracer_data __refdata
696 /* Tracers are seldom changed. Optimize when selftests are disabled. */
697 #define __tracer_data __read_mostly
698 #endif /* CONFIG_FTRACE_STARTUP_TEST */
700 extern void *head_page(struct trace_array_cpu *data);
701 extern unsigned long long ns2usecs(cycle_t nsec);
703 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
705 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
707 trace_array_vprintk(struct trace_array *tr,
708 unsigned long ip, const char *fmt, va_list args);
709 int trace_array_printk(struct trace_array *tr,
710 unsigned long ip, const char *fmt, ...);
711 int trace_array_printk_buf(struct ring_buffer *buffer,
712 unsigned long ip, const char *fmt, ...);
713 void trace_printk_seq(struct trace_seq *s);
714 enum print_line_t print_trace_line(struct trace_iterator *iter);
716 extern char trace_find_mark(unsigned long long duration);
718 /* Standard output formatting function used for function return traces */
719 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
722 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
723 #define TRACE_GRAPH_PRINT_CPU 0x2
724 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
725 #define TRACE_GRAPH_PRINT_PROC 0x8
726 #define TRACE_GRAPH_PRINT_DURATION 0x10
727 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
728 #define TRACE_GRAPH_PRINT_IRQS 0x40
729 #define TRACE_GRAPH_PRINT_TAIL 0x80
730 #define TRACE_GRAPH_SLEEP_TIME 0x100
731 #define TRACE_GRAPH_GRAPH_TIME 0x200
732 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
733 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
735 extern void ftrace_graph_sleep_time_control(bool enable);
736 extern void ftrace_graph_graph_time_control(bool enable);
738 extern enum print_line_t
739 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
740 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
742 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
743 extern void graph_trace_open(struct trace_iterator *iter);
744 extern void graph_trace_close(struct trace_iterator *iter);
745 extern int __trace_graph_entry(struct trace_array *tr,
746 struct ftrace_graph_ent *trace,
747 unsigned long flags, int pc);
748 extern void __trace_graph_return(struct trace_array *tr,
749 struct ftrace_graph_ret *trace,
750 unsigned long flags, int pc);
753 #ifdef CONFIG_DYNAMIC_FTRACE
754 /* TODO: make this variable */
755 #define FTRACE_GRAPH_MAX_FUNCS 32
756 extern int ftrace_graph_count;
757 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
758 extern int ftrace_graph_notrace_count;
759 extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS];
761 static inline int ftrace_graph_addr(unsigned long addr)
765 if (!ftrace_graph_count)
768 for (i = 0; i < ftrace_graph_count; i++) {
769 if (addr == ftrace_graph_funcs[i]) {
771 * If no irqs are to be traced, but a set_graph_function
772 * is set, and called by an interrupt handler, we still
776 trace_recursion_set(TRACE_IRQ_BIT);
778 trace_recursion_clear(TRACE_IRQ_BIT);
786 static inline int ftrace_graph_notrace_addr(unsigned long addr)
790 if (!ftrace_graph_notrace_count)
793 for (i = 0; i < ftrace_graph_notrace_count; i++) {
794 if (addr == ftrace_graph_notrace_funcs[i])
801 static inline int ftrace_graph_addr(unsigned long addr)
806 static inline int ftrace_graph_notrace_addr(unsigned long addr)
810 #endif /* CONFIG_DYNAMIC_FTRACE */
811 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
812 static inline enum print_line_t
813 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
815 return TRACE_TYPE_UNHANDLED;
817 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
819 extern struct list_head ftrace_pids;
821 #ifdef CONFIG_FUNCTION_TRACER
822 extern bool ftrace_filter_param __initdata;
823 static inline int ftrace_trace_task(struct task_struct *task)
825 if (list_empty(&ftrace_pids))
828 return test_tsk_trace_trace(task);
830 extern int ftrace_is_dead(void);
831 int ftrace_create_function_files(struct trace_array *tr,
832 struct dentry *parent);
833 void ftrace_destroy_function_files(struct trace_array *tr);
834 void ftrace_init_global_array_ops(struct trace_array *tr);
835 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
836 void ftrace_reset_array_ops(struct trace_array *tr);
837 int using_ftrace_ops_list_func(void);
839 static inline int ftrace_trace_task(struct task_struct *task)
843 static inline int ftrace_is_dead(void) { return 0; }
845 ftrace_create_function_files(struct trace_array *tr,
846 struct dentry *parent)
850 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
851 static inline __init void
852 ftrace_init_global_array_ops(struct trace_array *tr) { }
853 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
854 /* ftace_func_t type is not defined, use macro instead of static inline */
855 #define ftrace_init_array_ops(tr, func) do { } while (0)
856 #endif /* CONFIG_FUNCTION_TRACER */
858 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
859 void ftrace_create_filter_files(struct ftrace_ops *ops,
860 struct dentry *parent);
861 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
864 * The ops parameter passed in is usually undefined.
865 * This must be a macro.
867 #define ftrace_create_filter_files(ops, parent) do { } while (0)
868 #define ftrace_destroy_filter_files(ops) do { } while (0)
869 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
871 bool ftrace_event_is_function(struct trace_event_call *call);
874 * struct trace_parser - servers for reading the user input separated by spaces
875 * @cont: set if the input is not complete - no final space char was found
876 * @buffer: holds the parsed user input
877 * @idx: user input length
880 struct trace_parser {
887 static inline bool trace_parser_loaded(struct trace_parser *parser)
889 return (parser->idx != 0);
892 static inline bool trace_parser_cont(struct trace_parser *parser)
897 static inline void trace_parser_clear(struct trace_parser *parser)
899 parser->cont = false;
903 extern int trace_parser_get_init(struct trace_parser *parser, int size);
904 extern void trace_parser_put(struct trace_parser *parser);
905 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
906 size_t cnt, loff_t *ppos);
909 * Only create function graph options if function graph is configured.
911 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
912 # define FGRAPH_FLAGS \
913 C(DISPLAY_GRAPH, "display-graph"),
915 # define FGRAPH_FLAGS
918 #ifdef CONFIG_BRANCH_TRACER
919 # define BRANCH_FLAGS \
922 # define BRANCH_FLAGS
925 #ifdef CONFIG_FUNCTION_TRACER
926 # define FUNCTION_FLAGS \
927 C(FUNCTION, "function-trace"),
928 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
930 # define FUNCTION_FLAGS
931 # define FUNCTION_DEFAULT_FLAGS 0UL
934 #ifdef CONFIG_STACKTRACE
935 # define STACK_FLAGS \
936 C(STACKTRACE, "stacktrace"),
942 * trace_iterator_flags is an enumeration that defines bit
943 * positions into trace_flags that controls the output.
945 * NOTE: These bits must match the trace_options array in
946 * trace.c (this macro guarantees it).
948 #define TRACE_FLAGS \
949 C(PRINT_PARENT, "print-parent"), \
950 C(SYM_OFFSET, "sym-offset"), \
951 C(SYM_ADDR, "sym-addr"), \
952 C(VERBOSE, "verbose"), \
957 C(PRINTK, "trace_printk"), \
958 C(ANNOTATE, "annotate"), \
959 C(USERSTACKTRACE, "userstacktrace"), \
960 C(SYM_USEROBJ, "sym-userobj"), \
961 C(PRINTK_MSGONLY, "printk-msg-only"), \
962 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
963 C(LATENCY_FMT, "latency-format"), \
964 C(RECORD_CMD, "record-cmd"), \
965 C(OVERWRITE, "overwrite"), \
966 C(STOP_ON_FREE, "disable_on_free"), \
967 C(IRQ_INFO, "irq-info"), \
968 C(MARKERS, "markers"), \
975 * By defining C, we can make TRACE_FLAGS a list of bit names
976 * that will define the bits for the flag masks.
979 #define C(a, b) TRACE_ITER_##a##_BIT
981 enum trace_iterator_bits {
983 /* Make sure we don't go more than we have bits for */
988 * By redefining C, we can make TRACE_FLAGS a list of masks that
989 * use the bits as defined above.
992 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
994 enum trace_iterator_flags { TRACE_FLAGS };
997 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
998 * control the output of kernel symbols.
1000 #define TRACE_ITER_SYM_MASK \
1001 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1003 extern struct tracer nop_trace;
1005 #ifdef CONFIG_BRANCH_TRACER
1006 extern int enable_branch_tracing(struct trace_array *tr);
1007 extern void disable_branch_tracing(void);
1008 static inline int trace_branch_enable(struct trace_array *tr)
1010 if (tr->trace_flags & TRACE_ITER_BRANCH)
1011 return enable_branch_tracing(tr);
1014 static inline void trace_branch_disable(void)
1016 /* due to races, always disable */
1017 disable_branch_tracing();
1020 static inline int trace_branch_enable(struct trace_array *tr)
1024 static inline void trace_branch_disable(void)
1027 #endif /* CONFIG_BRANCH_TRACER */
1029 /* set ring buffers to default size if not already done so */
1030 int tracing_update_buffers(void);
1032 struct ftrace_event_field {
1033 struct list_head link;
1042 struct event_filter {
1043 int n_preds; /* Number assigned */
1044 int a_preds; /* allocated */
1045 struct filter_pred *preds;
1046 struct filter_pred *root;
1047 char *filter_string;
1050 struct event_subsystem {
1051 struct list_head list;
1053 struct event_filter *filter;
1057 struct trace_subsystem_dir {
1058 struct list_head list;
1059 struct event_subsystem *subsystem;
1060 struct trace_array *tr;
1061 struct dentry *entry;
1066 #define FILTER_PRED_INVALID ((unsigned short)-1)
1067 #define FILTER_PRED_IS_RIGHT (1 << 15)
1068 #define FILTER_PRED_FOLD (1 << 15)
1071 * The max preds is the size of unsigned short with
1072 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1073 * and FOLD flags. The other is reserved.
1075 * 2^14 preds is way more than enough.
1077 #define MAX_FILTER_PRED 16384
1082 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1084 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1094 char pattern[MAX_FILTER_STR_VAL];
1097 regex_match_func match;
1100 struct filter_pred {
1101 filter_pred_fn_t fn;
1104 unsigned short *ops;
1105 struct ftrace_event_field *field;
1109 unsigned short index;
1110 unsigned short parent;
1111 unsigned short left;
1112 unsigned short right;
1115 static inline bool is_string_field(struct ftrace_event_field *field)
1117 return field->filter_type == FILTER_DYN_STRING ||
1118 field->filter_type == FILTER_STATIC_STRING ||
1119 field->filter_type == FILTER_PTR_STRING;
1122 static inline bool is_function_field(struct ftrace_event_field *field)
1124 return field->filter_type == FILTER_TRACE_FN;
1127 extern enum regex_type
1128 filter_parse_regex(char *buff, int len, char **search, int *not);
1129 extern void print_event_filter(struct trace_event_file *file,
1130 struct trace_seq *s);
1131 extern int apply_event_filter(struct trace_event_file *file,
1132 char *filter_string);
1133 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1134 char *filter_string);
1135 extern void print_subsystem_event_filter(struct event_subsystem *system,
1136 struct trace_seq *s);
1137 extern int filter_assign_type(const char *type);
1138 extern int create_event_filter(struct trace_event_call *call,
1139 char *filter_str, bool set_str,
1140 struct event_filter **filterp);
1141 extern void free_event_filter(struct event_filter *filter);
1143 struct ftrace_event_field *
1144 trace_find_event_field(struct trace_event_call *call, char *name);
1146 extern void trace_event_enable_cmd_record(bool enable);
1147 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1148 extern int event_trace_del_tracer(struct trace_array *tr);
1150 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1154 static inline void *event_file_data(struct file *filp)
1156 return ACCESS_ONCE(file_inode(filp)->i_private);
1159 extern struct mutex event_mutex;
1160 extern struct list_head ftrace_events;
1162 extern const struct file_operations event_trigger_fops;
1164 extern int register_trigger_cmds(void);
1165 extern void clear_event_triggers(struct trace_array *tr);
1167 struct event_trigger_data {
1168 unsigned long count;
1170 struct event_trigger_ops *ops;
1171 struct event_command *cmd_ops;
1172 struct event_filter __rcu *filter;
1176 struct list_head list;
1179 extern void trigger_data_free(struct event_trigger_data *data);
1180 extern int event_trigger_init(struct event_trigger_ops *ops,
1181 struct event_trigger_data *data);
1182 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1183 int trigger_enable);
1184 extern void update_cond_flag(struct trace_event_file *file);
1185 extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
1186 struct event_trigger_data *test,
1187 struct trace_event_file *file);
1188 extern int set_trigger_filter(char *filter_str,
1189 struct event_trigger_data *trigger_data,
1190 struct trace_event_file *file);
1191 extern int register_event_command(struct event_command *cmd);
1194 * struct event_trigger_ops - callbacks for trace event triggers
1196 * The methods in this structure provide per-event trigger hooks for
1197 * various trigger operations.
1199 * All the methods below, except for @init() and @free(), must be
1202 * @func: The trigger 'probe' function called when the triggering
1203 * event occurs. The data passed into this callback is the data
1204 * that was supplied to the event_command @reg() function that
1205 * registered the trigger (see struct event_command) along with
1206 * the trace record, rec.
1208 * @init: An optional initialization function called for the trigger
1209 * when the trigger is registered (via the event_command reg()
1210 * function). This can be used to perform per-trigger
1211 * initialization such as incrementing a per-trigger reference
1212 * count, for instance. This is usually implemented by the
1213 * generic utility function @event_trigger_init() (see
1214 * trace_event_triggers.c).
1216 * @free: An optional de-initialization function called for the
1217 * trigger when the trigger is unregistered (via the
1218 * event_command @reg() function). This can be used to perform
1219 * per-trigger de-initialization such as decrementing a
1220 * per-trigger reference count and freeing corresponding trigger
1221 * data, for instance. This is usually implemented by the
1222 * generic utility function @event_trigger_free() (see
1223 * trace_event_triggers.c).
1225 * @print: The callback function invoked to have the trigger print
1226 * itself. This is usually implemented by a wrapper function
1227 * that calls the generic utility function @event_trigger_print()
1228 * (see trace_event_triggers.c).
1230 struct event_trigger_ops {
1231 void (*func)(struct event_trigger_data *data,
1233 int (*init)(struct event_trigger_ops *ops,
1234 struct event_trigger_data *data);
1235 void (*free)(struct event_trigger_ops *ops,
1236 struct event_trigger_data *data);
1237 int (*print)(struct seq_file *m,
1238 struct event_trigger_ops *ops,
1239 struct event_trigger_data *data);
1243 * struct event_command - callbacks and data members for event commands
1245 * Event commands are invoked by users by writing the command name
1246 * into the 'trigger' file associated with a trace event. The
1247 * parameters associated with a specific invocation of an event
1248 * command are used to create an event trigger instance, which is
1249 * added to the list of trigger instances associated with that trace
1250 * event. When the event is hit, the set of triggers associated with
1251 * that event is invoked.
1253 * The data members in this structure provide per-event command data
1254 * for various event commands.
1256 * All the data members below, except for @post_trigger, must be set
1257 * for each event command.
1259 * @name: The unique name that identifies the event command. This is
1260 * the name used when setting triggers via trigger files.
1262 * @trigger_type: A unique id that identifies the event command
1263 * 'type'. This value has two purposes, the first to ensure that
1264 * only one trigger of the same type can be set at a given time
1265 * for a particular event e.g. it doesn't make sense to have both
1266 * a traceon and traceoff trigger attached to a single event at
1267 * the same time, so traceon and traceoff have the same type
1268 * though they have different names. The @trigger_type value is
1269 * also used as a bit value for deferring the actual trigger
1270 * action until after the current event is finished. Some
1271 * commands need to do this if they themselves log to the trace
1272 * buffer (see the @post_trigger() member below). @trigger_type
1273 * values are defined by adding new values to the trigger_type
1274 * enum in include/linux/trace_events.h.
1276 * @post_trigger: A flag that says whether or not this command needs
1277 * to have its action delayed until after the current event has
1278 * been closed. Some triggers need to avoid being invoked while
1279 * an event is currently in the process of being logged, since
1280 * the trigger may itself log data into the trace buffer. Thus
1281 * we make sure the current event is committed before invoking
1282 * those triggers. To do that, the trigger invocation is split
1283 * in two - the first part checks the filter using the current
1284 * trace record; if a command has the @post_trigger flag set, it
1285 * sets a bit for itself in the return value, otherwise it
1286 * directly invokes the trigger. Once all commands have been
1287 * either invoked or set their return flag, the current record is
1288 * either committed or discarded. At that point, if any commands
1289 * have deferred their triggers, those commands are finally
1290 * invoked following the close of the current event. In other
1291 * words, if the event_trigger_ops @func() probe implementation
1292 * itself logs to the trace buffer, this flag should be set,
1293 * otherwise it can be left unspecified.
1295 * @needs_rec: A flag that says whether or not this command needs
1296 * access to the trace record in order to perform its function,
1297 * regardless of whether or not it has a filter associated with
1298 * it (filters make a trigger require access to the trace record
1299 * but are not always present).
1301 * All the methods below, except for @set_filter() and @unreg_all(),
1302 * must be implemented.
1304 * @func: The callback function responsible for parsing and
1305 * registering the trigger written to the 'trigger' file by the
1306 * user. It allocates the trigger instance and registers it with
1307 * the appropriate trace event. It makes use of the other
1308 * event_command callback functions to orchestrate this, and is
1309 * usually implemented by the generic utility function
1310 * @event_trigger_callback() (see trace_event_triggers.c).
1312 * @reg: Adds the trigger to the list of triggers associated with the
1313 * event, and enables the event trigger itself, after
1314 * initializing it (via the event_trigger_ops @init() function).
1315 * This is also where commands can use the @trigger_type value to
1316 * make the decision as to whether or not multiple instances of
1317 * the trigger should be allowed. This is usually implemented by
1318 * the generic utility function @register_trigger() (see
1319 * trace_event_triggers.c).
1321 * @unreg: Removes the trigger from the list of triggers associated
1322 * with the event, and disables the event trigger itself, after
1323 * initializing it (via the event_trigger_ops @free() function).
1324 * This is usually implemented by the generic utility function
1325 * @unregister_trigger() (see trace_event_triggers.c).
1327 * @unreg_all: An optional function called to remove all the triggers
1328 * from the list of triggers associated with the event. Called
1329 * when a trigger file is opened in truncate mode.
1331 * @set_filter: An optional function called to parse and set a filter
1332 * for the trigger. If no @set_filter() method is set for the
1333 * event command, filters set by the user for the command will be
1334 * ignored. This is usually implemented by the generic utility
1335 * function @set_trigger_filter() (see trace_event_triggers.c).
1337 * @get_trigger_ops: The callback function invoked to retrieve the
1338 * event_trigger_ops implementation associated with the command.
1340 struct event_command {
1341 struct list_head list;
1343 enum event_trigger_type trigger_type;
1346 int (*func)(struct event_command *cmd_ops,
1347 struct trace_event_file *file,
1348 char *glob, char *cmd, char *params);
1349 int (*reg)(char *glob,
1350 struct event_trigger_ops *ops,
1351 struct event_trigger_data *data,
1352 struct trace_event_file *file);
1353 void (*unreg)(char *glob,
1354 struct event_trigger_ops *ops,
1355 struct event_trigger_data *data,
1356 struct trace_event_file *file);
1357 void (*unreg_all)(struct trace_event_file *file);
1358 int (*set_filter)(char *filter_str,
1359 struct event_trigger_data *data,
1360 struct trace_event_file *file);
1361 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1364 extern int trace_event_enable_disable(struct trace_event_file *file,
1365 int enable, int soft_disable);
1366 extern int tracing_alloc_snapshot(void);
1368 extern const char *__start___trace_bprintk_fmt[];
1369 extern const char *__stop___trace_bprintk_fmt[];
1371 extern const char *__start___tracepoint_str[];
1372 extern const char *__stop___tracepoint_str[];
1374 void trace_printk_control(bool enabled);
1375 void trace_printk_init_buffers(void);
1376 void trace_printk_start_comm(void);
1377 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1378 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1381 * Normal trace_printk() and friends allocates special buffers
1382 * to do the manipulation, as well as saves the print formats
1383 * into sections to display. But the trace infrastructure wants
1384 * to use these without the added overhead at the price of being
1385 * a bit slower (used mainly for warnings, where we don't care
1386 * about performance). The internal_trace_puts() is for such
1389 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1392 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1393 extern struct trace_event_call \
1394 __aligned(4) event_##call;
1395 #undef FTRACE_ENTRY_DUP
1396 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1397 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1399 #include "trace_entries.h"
1401 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1402 int perf_ftrace_event_register(struct trace_event_call *call,
1403 enum trace_reg type, void *data);
1405 #define perf_ftrace_event_register NULL
1408 #ifdef CONFIG_FTRACE_SYSCALLS
1409 void init_ftrace_syscalls(void);
1410 const char *get_syscall_name(int syscall);
1412 static inline void init_ftrace_syscalls(void) { }
1413 static inline const char *get_syscall_name(int syscall)
1419 #ifdef CONFIG_EVENT_TRACING
1420 void trace_event_init(void);
1421 void trace_event_enum_update(struct trace_enum_map **map, int len);
1423 static inline void __init trace_event_init(void) { }
1424 static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { }
1427 extern struct trace_iterator *tracepoint_print_iter;
1429 #endif /* _LINUX_KERNEL_TRACE_H */