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; \
75 #define TP_ARGS(args...) args
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 #include "trace_entries.h"
89 * syscalls are special, and need special handling, this is why
90 * they are not included in trace_entries.h
92 struct syscall_trace_enter {
93 struct trace_entry ent;
98 struct syscall_trace_exit {
99 struct trace_entry ent;
104 struct kprobe_trace_entry_head {
105 struct trace_entry ent;
109 struct kretprobe_trace_entry_head {
110 struct trace_entry ent;
112 unsigned long ret_ip;
116 * trace_flag_type is an enumeration that holds different
117 * states when a trace occurs. These are:
118 * IRQS_OFF - interrupts were disabled
119 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
120 * NEED_RESCHED - reschedule is requested
121 * HARDIRQ - inside an interrupt handler
122 * SOFTIRQ - inside a softirq handler
124 enum trace_flag_type {
125 TRACE_FLAG_IRQS_OFF = 0x01,
126 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
127 TRACE_FLAG_NEED_RESCHED = 0x04,
128 TRACE_FLAG_HARDIRQ = 0x08,
129 TRACE_FLAG_SOFTIRQ = 0x10,
130 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
133 #define TRACE_BUF_SIZE 1024
138 * The CPU trace array - it consists of thousands of trace entries
139 * plus some other descriptor data: (for example which task started
142 struct trace_array_cpu {
144 void *buffer_page; /* ring buffer spare */
146 unsigned long entries;
147 unsigned long saved_latency;
148 unsigned long critical_start;
149 unsigned long critical_end;
150 unsigned long critical_sequence;
152 unsigned long policy;
153 unsigned long rt_priority;
154 unsigned long skipped_entries;
155 cycle_t preempt_timestamp;
158 char comm[TASK_COMM_LEN];
163 struct trace_buffer {
164 struct trace_array *tr;
165 struct ring_buffer *buffer;
166 struct trace_array_cpu __percpu *data;
172 * The trace array - an array of per-CPU trace arrays. This is the
173 * highest level data structure that individual tracers deal with.
174 * They have on/off state as well:
177 struct list_head list;
179 struct trace_buffer trace_buffer;
180 #ifdef CONFIG_TRACER_MAX_TRACE
182 * The max_buffer is used to snapshot the trace when a maximum
183 * latency is reached, or when the user initiates a snapshot.
184 * Some tracers will use this to store a maximum trace while
185 * it continues examining live traces.
187 * The buffers for the max_buffer are set up the same as the trace_buffer
188 * When a snapshot is taken, the buffer of the max_buffer is swapped
189 * with the buffer of the trace_buffer and the buffers are reset for
190 * the trace_buffer so the tracing can continue.
192 struct trace_buffer max_buffer;
193 bool allocated_snapshot;
194 unsigned long max_latency;
197 * max_lock is used to protect the swapping of buffers
198 * when taking a max snapshot. The buffers themselves are
199 * protected by per_cpu spinlocks. But the action of the swap
200 * needs its own lock.
202 * This is defined as a arch_spinlock_t in order to help
203 * with performance when lockdep debugging is enabled.
205 * It is also used in other places outside the update_max_tr
206 * so it needs to be defined outside of the
207 * CONFIG_TRACER_MAX_TRACE.
209 arch_spinlock_t max_lock;
211 #ifdef CONFIG_FTRACE_SYSCALLS
212 int sys_refcount_enter;
213 int sys_refcount_exit;
214 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
215 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
219 struct tracer *current_trace;
221 raw_spinlock_t start_lock;
223 struct dentry *options;
224 struct dentry *percpu_dir;
225 struct dentry *event_dir;
226 struct list_head systems;
227 struct list_head events;
228 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
230 #ifdef CONFIG_FUNCTION_TRACER
231 struct ftrace_ops *ops;
232 /* function tracing enabled */
233 int function_enabled;
238 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
241 extern struct list_head ftrace_trace_arrays;
243 extern struct mutex trace_types_lock;
245 extern int trace_array_get(struct trace_array *tr);
246 extern void trace_array_put(struct trace_array *tr);
249 * The global tracer (top) should be the first trace array added,
250 * but we check the flag anyway.
252 static inline struct trace_array *top_trace_array(void)
254 struct trace_array *tr;
256 if (list_empty(&ftrace_trace_arrays))
259 tr = list_entry(ftrace_trace_arrays.prev,
261 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
265 #define FTRACE_CMP_TYPE(var, type) \
266 __builtin_types_compatible_p(typeof(var), type *)
269 #define IF_ASSIGN(var, entry, etype, id) \
270 if (FTRACE_CMP_TYPE(var, etype)) { \
271 var = (typeof(var))(entry); \
272 WARN_ON(id && (entry)->type != id); \
276 /* Will cause compile errors if type is not found. */
277 extern void __ftrace_bad_type(void);
280 * The trace_assign_type is a verifier that the entry type is
281 * the same as the type being assigned. To add new types simply
282 * add a line with the following format:
284 * IF_ASSIGN(var, ent, type, id);
286 * Where "type" is the trace type that includes the trace_entry
287 * as the "ent" item. And "id" is the trace identifier that is
288 * used in the trace_type enum.
290 * If the type can have more than one id, then use zero.
292 #define trace_assign_type(var, ent) \
294 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
295 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
296 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
297 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
298 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
299 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
300 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
301 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
303 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
305 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
306 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
308 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
310 __ftrace_bad_type(); \
314 * An option specific to a tracer. This is a boolean value.
315 * The bit is the bit index that sets its value on the
316 * flags value in struct tracer_flags.
319 const char *name; /* Will appear on the trace_options file */
320 u32 bit; /* Mask assigned in val field in tracer_flags */
324 * The set of specific options for a tracer. Your tracer
325 * have to set the initial value of the flags val.
327 struct tracer_flags {
329 struct tracer_opt *opts;
332 /* Makes more easy to define a tracer opt */
333 #define TRACER_OPT(s, b) .name = #s, .bit = b
336 struct trace_option_dentry {
337 struct tracer_opt *opt;
338 struct tracer_flags *flags;
339 struct trace_array *tr;
340 struct dentry *entry;
344 * struct tracer - a specific tracer and its callbacks to interact with tracefs
345 * @name: the name chosen to select it on the available_tracers file
346 * @init: called when one switches to this tracer (echo name > current_tracer)
347 * @reset: called when one switches to another tracer
348 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
349 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
350 * @update_thresh: called when tracing_thresh is updated
351 * @open: called when the trace file is opened
352 * @pipe_open: called when the trace_pipe file is opened
353 * @close: called when the trace file is released
354 * @pipe_close: called when the trace_pipe file is released
355 * @read: override the default read callback on trace_pipe
356 * @splice_read: override the default splice_read callback on trace_pipe
357 * @selftest: selftest to run on boot (see trace_selftest.c)
358 * @print_headers: override the first lines that describe your columns
359 * @print_line: callback that prints a trace
360 * @set_flag: signals one of your private flags changed (trace_options file)
361 * @flags: your private flags
365 int (*init)(struct trace_array *tr);
366 void (*reset)(struct trace_array *tr);
367 void (*start)(struct trace_array *tr);
368 void (*stop)(struct trace_array *tr);
369 int (*update_thresh)(struct trace_array *tr);
370 void (*open)(struct trace_iterator *iter);
371 void (*pipe_open)(struct trace_iterator *iter);
372 void (*close)(struct trace_iterator *iter);
373 void (*pipe_close)(struct trace_iterator *iter);
374 ssize_t (*read)(struct trace_iterator *iter,
375 struct file *filp, char __user *ubuf,
376 size_t cnt, loff_t *ppos);
377 ssize_t (*splice_read)(struct trace_iterator *iter,
380 struct pipe_inode_info *pipe,
383 #ifdef CONFIG_FTRACE_STARTUP_TEST
384 int (*selftest)(struct tracer *trace,
385 struct trace_array *tr);
387 void (*print_header)(struct seq_file *m);
388 enum print_line_t (*print_line)(struct trace_iterator *iter);
389 /* If you handled the flag setting, return 0 */
390 int (*set_flag)(struct trace_array *tr,
391 u32 old_flags, u32 bit, int set);
392 /* Return 0 if OK with change, else return non-zero */
393 int (*flag_changed)(struct trace_array *tr,
396 struct tracer_flags *flags;
397 struct trace_option_dentry *topts;
401 bool allow_instances;
402 #ifdef CONFIG_TRACER_MAX_TRACE
408 /* Only current can touch trace_recursion */
411 * For function tracing recursion:
412 * The order of these bits are important.
414 * When function tracing occurs, the following steps are made:
415 * If arch does not support a ftrace feature:
416 * call internal function (uses INTERNAL bits) which calls...
417 * If callback is registered to the "global" list, the list
418 * function is called and recursion checks the GLOBAL bits.
419 * then this function calls...
420 * The function callback, which can use the FTRACE bits to
421 * check for recursion.
423 * Now if the arch does not suppport a feature, and it calls
424 * the global list function which calls the ftrace callback
425 * all three of these steps will do a recursion protection.
426 * There's no reason to do one if the previous caller already
427 * did. The recursion that we are protecting against will
428 * go through the same steps again.
430 * To prevent the multiple recursion checks, if a recursion
431 * bit is set that is higher than the MAX bit of the current
432 * check, then we know that the check was made by the previous
433 * caller, and we can skip the current check.
437 TRACE_BUFFER_NMI_BIT,
438 TRACE_BUFFER_IRQ_BIT,
439 TRACE_BUFFER_SIRQ_BIT,
441 /* Start of function recursion bits */
443 TRACE_FTRACE_NMI_BIT,
444 TRACE_FTRACE_IRQ_BIT,
445 TRACE_FTRACE_SIRQ_BIT,
447 /* INTERNAL_BITs must be greater than FTRACE_BITs */
449 TRACE_INTERNAL_NMI_BIT,
450 TRACE_INTERNAL_IRQ_BIT,
451 TRACE_INTERNAL_SIRQ_BIT,
457 * Abuse of the trace_recursion.
458 * As we need a way to maintain state if we are tracing the function
459 * graph in irq because we want to trace a particular function that
460 * was called in irq context but we have irq tracing off. Since this
461 * can only be modified by current, we can reuse trace_recursion.
466 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
467 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
468 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
470 #define TRACE_CONTEXT_BITS 4
472 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
473 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
475 #define TRACE_LIST_START TRACE_INTERNAL_BIT
476 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
478 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
480 static __always_inline int trace_get_context_bit(void)
484 if (in_interrupt()) {
498 static __always_inline int trace_test_and_set_recursion(int start, int max)
500 unsigned int val = current->trace_recursion;
503 /* A previous recursion check was made */
504 if ((val & TRACE_CONTEXT_MASK) > max)
507 bit = trace_get_context_bit() + start;
508 if (unlikely(val & (1 << bit)))
512 current->trace_recursion = val;
518 static __always_inline void trace_clear_recursion(int bit)
520 unsigned int val = current->trace_recursion;
529 current->trace_recursion = val;
532 static inline struct ring_buffer_iter *
533 trace_buffer_iter(struct trace_iterator *iter, int cpu)
535 if (iter->buffer_iter && iter->buffer_iter[cpu])
536 return iter->buffer_iter[cpu];
540 int tracer_init(struct tracer *t, struct trace_array *tr);
541 int tracing_is_enabled(void);
542 void tracing_reset(struct trace_buffer *buf, int cpu);
543 void tracing_reset_online_cpus(struct trace_buffer *buf);
544 void tracing_reset_current(int cpu);
545 void tracing_reset_all_online_cpus(void);
546 int tracing_open_generic(struct inode *inode, struct file *filp);
547 bool tracing_is_disabled(void);
548 struct dentry *trace_create_file(const char *name,
550 struct dentry *parent,
552 const struct file_operations *fops);
554 struct dentry *tracing_init_dentry(void);
556 struct ring_buffer_event;
558 struct ring_buffer_event *
559 trace_buffer_lock_reserve(struct ring_buffer *buffer,
565 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
566 struct trace_array_cpu *data);
568 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
569 int *ent_cpu, u64 *ent_ts);
571 void __buffer_unlock_commit(struct ring_buffer *buffer,
572 struct ring_buffer_event *event);
574 int trace_empty(struct trace_iterator *iter);
576 void *trace_find_next_entry_inc(struct trace_iterator *iter);
578 void trace_init_global_iter(struct trace_iterator *iter);
580 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
582 void trace_function(struct trace_array *tr,
584 unsigned long parent_ip,
585 unsigned long flags, int pc);
586 void trace_graph_function(struct trace_array *tr,
588 unsigned long parent_ip,
589 unsigned long flags, int pc);
590 void trace_latency_header(struct seq_file *m);
591 void trace_default_header(struct seq_file *m);
592 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
593 int trace_empty(struct trace_iterator *iter);
595 void trace_graph_return(struct ftrace_graph_ret *trace);
596 int trace_graph_entry(struct ftrace_graph_ent *trace);
597 void set_graph_array(struct trace_array *tr);
599 void tracing_start_cmdline_record(void);
600 void tracing_stop_cmdline_record(void);
601 int register_tracer(struct tracer *type);
602 int is_tracing_stopped(void);
604 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
606 extern cpumask_var_t __read_mostly tracing_buffer_mask;
608 #define for_each_tracing_cpu(cpu) \
609 for_each_cpu(cpu, tracing_buffer_mask)
611 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
613 extern unsigned long tracing_thresh;
615 #ifdef CONFIG_TRACER_MAX_TRACE
616 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
617 void update_max_tr_single(struct trace_array *tr,
618 struct task_struct *tsk, int cpu);
619 #endif /* CONFIG_TRACER_MAX_TRACE */
621 #ifdef CONFIG_STACKTRACE
622 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
625 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
628 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
629 unsigned long flags, int pc)
633 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
637 #endif /* CONFIG_STACKTRACE */
639 extern cycle_t ftrace_now(int cpu);
641 extern void trace_find_cmdline(int pid, char comm[]);
643 #ifdef CONFIG_DYNAMIC_FTRACE
644 extern unsigned long ftrace_update_tot_cnt;
646 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
647 extern int DYN_FTRACE_TEST_NAME(void);
648 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
649 extern int DYN_FTRACE_TEST_NAME2(void);
651 extern bool ring_buffer_expanded;
652 extern bool tracing_selftest_disabled;
653 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
655 #ifdef CONFIG_FTRACE_STARTUP_TEST
656 extern int trace_selftest_startup_function(struct tracer *trace,
657 struct trace_array *tr);
658 extern int trace_selftest_startup_function_graph(struct tracer *trace,
659 struct trace_array *tr);
660 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
661 struct trace_array *tr);
662 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
663 struct trace_array *tr);
664 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
665 struct trace_array *tr);
666 extern int trace_selftest_startup_wakeup(struct tracer *trace,
667 struct trace_array *tr);
668 extern int trace_selftest_startup_nop(struct tracer *trace,
669 struct trace_array *tr);
670 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
671 struct trace_array *tr);
672 extern int trace_selftest_startup_branch(struct tracer *trace,
673 struct trace_array *tr);
675 * Tracer data references selftest functions that only occur
676 * on boot up. These can be __init functions. Thus, when selftests
677 * are enabled, then the tracers need to reference __init functions.
679 #define __tracer_data __refdata
681 /* Tracers are seldom changed. Optimize when selftests are disabled. */
682 #define __tracer_data __read_mostly
683 #endif /* CONFIG_FTRACE_STARTUP_TEST */
685 extern void *head_page(struct trace_array_cpu *data);
686 extern unsigned long long ns2usecs(cycle_t nsec);
688 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
690 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
692 trace_array_vprintk(struct trace_array *tr,
693 unsigned long ip, const char *fmt, va_list args);
694 int trace_array_printk(struct trace_array *tr,
695 unsigned long ip, const char *fmt, ...);
696 int trace_array_printk_buf(struct ring_buffer *buffer,
697 unsigned long ip, const char *fmt, ...);
698 void trace_printk_seq(struct trace_seq *s);
699 enum print_line_t print_trace_line(struct trace_iterator *iter);
701 extern unsigned long trace_flags;
703 extern char trace_find_mark(unsigned long long duration);
705 /* Standard output formatting function used for function return traces */
706 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
709 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
710 #define TRACE_GRAPH_PRINT_CPU 0x2
711 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
712 #define TRACE_GRAPH_PRINT_PROC 0x8
713 #define TRACE_GRAPH_PRINT_DURATION 0x10
714 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
715 #define TRACE_GRAPH_PRINT_IRQS 0x40
716 #define TRACE_GRAPH_PRINT_TAIL 0x80
717 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
718 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
720 extern enum print_line_t
721 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
722 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
724 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
725 extern void graph_trace_open(struct trace_iterator *iter);
726 extern void graph_trace_close(struct trace_iterator *iter);
727 extern int __trace_graph_entry(struct trace_array *tr,
728 struct ftrace_graph_ent *trace,
729 unsigned long flags, int pc);
730 extern void __trace_graph_return(struct trace_array *tr,
731 struct ftrace_graph_ret *trace,
732 unsigned long flags, int pc);
735 #ifdef CONFIG_DYNAMIC_FTRACE
736 /* TODO: make this variable */
737 #define FTRACE_GRAPH_MAX_FUNCS 32
738 extern int ftrace_graph_count;
739 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
740 extern int ftrace_graph_notrace_count;
741 extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS];
743 static inline int ftrace_graph_addr(unsigned long addr)
747 if (!ftrace_graph_count)
750 for (i = 0; i < ftrace_graph_count; i++) {
751 if (addr == ftrace_graph_funcs[i]) {
753 * If no irqs are to be traced, but a set_graph_function
754 * is set, and called by an interrupt handler, we still
758 trace_recursion_set(TRACE_IRQ_BIT);
760 trace_recursion_clear(TRACE_IRQ_BIT);
768 static inline int ftrace_graph_notrace_addr(unsigned long addr)
772 if (!ftrace_graph_notrace_count)
775 for (i = 0; i < ftrace_graph_notrace_count; i++) {
776 if (addr == ftrace_graph_notrace_funcs[i])
783 static inline int ftrace_graph_addr(unsigned long addr)
788 static inline int ftrace_graph_notrace_addr(unsigned long addr)
792 #endif /* CONFIG_DYNAMIC_FTRACE */
793 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
794 static inline enum print_line_t
795 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
797 return TRACE_TYPE_UNHANDLED;
799 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
801 extern struct list_head ftrace_pids;
803 #ifdef CONFIG_FUNCTION_TRACER
804 extern bool ftrace_filter_param __initdata;
805 static inline int ftrace_trace_task(struct task_struct *task)
807 if (list_empty(&ftrace_pids))
810 return test_tsk_trace_trace(task);
812 extern int ftrace_is_dead(void);
813 int ftrace_create_function_files(struct trace_array *tr,
814 struct dentry *parent);
815 void ftrace_destroy_function_files(struct trace_array *tr);
816 void ftrace_init_global_array_ops(struct trace_array *tr);
817 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
818 void ftrace_reset_array_ops(struct trace_array *tr);
819 int using_ftrace_ops_list_func(void);
821 static inline int ftrace_trace_task(struct task_struct *task)
825 static inline int ftrace_is_dead(void) { return 0; }
827 ftrace_create_function_files(struct trace_array *tr,
828 struct dentry *parent)
832 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
833 static inline __init void
834 ftrace_init_global_array_ops(struct trace_array *tr) { }
835 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
836 /* ftace_func_t type is not defined, use macro instead of static inline */
837 #define ftrace_init_array_ops(tr, func) do { } while (0)
838 #endif /* CONFIG_FUNCTION_TRACER */
840 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
841 void ftrace_create_filter_files(struct ftrace_ops *ops,
842 struct dentry *parent);
843 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
846 * The ops parameter passed in is usually undefined.
847 * This must be a macro.
849 #define ftrace_create_filter_files(ops, parent) do { } while (0)
850 #define ftrace_destroy_filter_files(ops) do { } while (0)
851 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
853 int ftrace_event_is_function(struct trace_event_call *call);
856 * struct trace_parser - servers for reading the user input separated by spaces
857 * @cont: set if the input is not complete - no final space char was found
858 * @buffer: holds the parsed user input
859 * @idx: user input length
862 struct trace_parser {
869 static inline bool trace_parser_loaded(struct trace_parser *parser)
871 return (parser->idx != 0);
874 static inline bool trace_parser_cont(struct trace_parser *parser)
879 static inline void trace_parser_clear(struct trace_parser *parser)
881 parser->cont = false;
885 extern int trace_parser_get_init(struct trace_parser *parser, int size);
886 extern void trace_parser_put(struct trace_parser *parser);
887 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
888 size_t cnt, loff_t *ppos);
891 * Only create function graph options if function graph is configured.
893 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
894 # define FGRAPH_FLAGS \
895 C(SLEEP_TIME, "sleep-time"), \
896 C(GRAPH_TIME, "graph-time"), \
897 C(DISPLAY_GRAPH, "display-graph"),
898 /* Initially set for trace_flags */
899 # define FUNCTION_GRAPH_DEFAULT_FLAGS \
900 (TRACE_ITER_SLEEP_TIME | TRACE_ITER_GRAPH_TIME)
902 # define FGRAPH_FLAGS
903 # define FUNCTION_GRAPH_DEFAULT_FLAGS 0UL
906 #ifdef CONFIG_BRANCH_TRACER
907 # define BRANCH_FLAGS \
910 # define BRANCH_FLAGS
913 #ifdef CONFIG_FUNCTION_TRACER
914 # define FUNCTION_FLAGS \
915 C(FUNCTION, "function-trace"),
916 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
918 # define FUNCTION_FLAGS
919 # define FUNCTION_DEFAULT_FLAGS 0UL
922 #ifdef CONFIG_STACKTRACE
923 # define STACK_FLAGS \
924 C(STACKTRACE, "stacktrace"),
930 * trace_iterator_flags is an enumeration that defines bit
931 * positions into trace_flags that controls the output.
933 * NOTE: These bits must match the trace_options array in
934 * trace.c (this macro guarantees it).
936 #define TRACE_FLAGS \
937 C(PRINT_PARENT, "print-parent"), \
938 C(SYM_OFFSET, "sym-offset"), \
939 C(SYM_ADDR, "sym-addr"), \
940 C(VERBOSE, "verbose"), \
945 C(PRINTK, "trace_printk"), \
946 C(ANNOTATE, "annotate"), \
947 C(USERSTACKTRACE, "userstacktrace"), \
948 C(SYM_USEROBJ, "sym-userobj"), \
949 C(PRINTK_MSGONLY, "printk-msg-only"), \
950 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
951 C(LATENCY_FMT, "latency-format"), \
952 C(RECORD_CMD, "record-cmd"), \
953 C(OVERWRITE, "overwrite"), \
954 C(STOP_ON_FREE, "disable_on_free"), \
955 C(IRQ_INFO, "irq-info"), \
956 C(MARKERS, "markers"), \
963 * By defining C, we can make TRACE_FLAGS a list of bit names
964 * that will define the bits for the flag masks.
967 #define C(a, b) TRACE_ITER_##a##_BIT
969 enum trace_iterator_bits {
971 /* Make sure we don't go more than we have bits for */
976 * By redefining C, we can make TRACE_FLAGS a list of masks that
977 * use the bits as defined above.
980 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
982 enum trace_iterator_flags { TRACE_FLAGS };
985 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
986 * control the output of kernel symbols.
988 #define TRACE_ITER_SYM_MASK \
989 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
991 extern struct tracer nop_trace;
993 #ifdef CONFIG_BRANCH_TRACER
994 extern int enable_branch_tracing(struct trace_array *tr);
995 extern void disable_branch_tracing(void);
996 static inline int trace_branch_enable(struct trace_array *tr)
998 if (trace_flags & TRACE_ITER_BRANCH)
999 return enable_branch_tracing(tr);
1002 static inline void trace_branch_disable(void)
1004 /* due to races, always disable */
1005 disable_branch_tracing();
1008 static inline int trace_branch_enable(struct trace_array *tr)
1012 static inline void trace_branch_disable(void)
1015 #endif /* CONFIG_BRANCH_TRACER */
1017 /* set ring buffers to default size if not already done so */
1018 int tracing_update_buffers(void);
1020 struct ftrace_event_field {
1021 struct list_head link;
1030 struct event_filter {
1031 int n_preds; /* Number assigned */
1032 int a_preds; /* allocated */
1033 struct filter_pred *preds;
1034 struct filter_pred *root;
1035 char *filter_string;
1038 struct event_subsystem {
1039 struct list_head list;
1041 struct event_filter *filter;
1045 struct trace_subsystem_dir {
1046 struct list_head list;
1047 struct event_subsystem *subsystem;
1048 struct trace_array *tr;
1049 struct dentry *entry;
1054 #define FILTER_PRED_INVALID ((unsigned short)-1)
1055 #define FILTER_PRED_IS_RIGHT (1 << 15)
1056 #define FILTER_PRED_FOLD (1 << 15)
1059 * The max preds is the size of unsigned short with
1060 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1061 * and FOLD flags. The other is reserved.
1063 * 2^14 preds is way more than enough.
1065 #define MAX_FILTER_PRED 16384
1070 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1072 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1082 char pattern[MAX_FILTER_STR_VAL];
1085 regex_match_func match;
1088 struct filter_pred {
1089 filter_pred_fn_t fn;
1092 unsigned short *ops;
1093 struct ftrace_event_field *field;
1097 unsigned short index;
1098 unsigned short parent;
1099 unsigned short left;
1100 unsigned short right;
1103 extern enum regex_type
1104 filter_parse_regex(char *buff, int len, char **search, int *not);
1105 extern void print_event_filter(struct trace_event_file *file,
1106 struct trace_seq *s);
1107 extern int apply_event_filter(struct trace_event_file *file,
1108 char *filter_string);
1109 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1110 char *filter_string);
1111 extern void print_subsystem_event_filter(struct event_subsystem *system,
1112 struct trace_seq *s);
1113 extern int filter_assign_type(const char *type);
1114 extern int create_event_filter(struct trace_event_call *call,
1115 char *filter_str, bool set_str,
1116 struct event_filter **filterp);
1117 extern void free_event_filter(struct event_filter *filter);
1119 struct ftrace_event_field *
1120 trace_find_event_field(struct trace_event_call *call, char *name);
1122 extern void trace_event_enable_cmd_record(bool enable);
1123 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1124 extern int event_trace_del_tracer(struct trace_array *tr);
1126 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1130 static inline void *event_file_data(struct file *filp)
1132 return ACCESS_ONCE(file_inode(filp)->i_private);
1135 extern struct mutex event_mutex;
1136 extern struct list_head ftrace_events;
1138 extern const struct file_operations event_trigger_fops;
1140 extern int register_trigger_cmds(void);
1141 extern void clear_event_triggers(struct trace_array *tr);
1143 struct event_trigger_data {
1144 unsigned long count;
1146 struct event_trigger_ops *ops;
1147 struct event_command *cmd_ops;
1148 struct event_filter __rcu *filter;
1151 struct list_head list;
1155 * struct event_trigger_ops - callbacks for trace event triggers
1157 * The methods in this structure provide per-event trigger hooks for
1158 * various trigger operations.
1160 * All the methods below, except for @init() and @free(), must be
1163 * @func: The trigger 'probe' function called when the triggering
1164 * event occurs. The data passed into this callback is the data
1165 * that was supplied to the event_command @reg() function that
1166 * registered the trigger (see struct event_command).
1168 * @init: An optional initialization function called for the trigger
1169 * when the trigger is registered (via the event_command reg()
1170 * function). This can be used to perform per-trigger
1171 * initialization such as incrementing a per-trigger reference
1172 * count, for instance. This is usually implemented by the
1173 * generic utility function @event_trigger_init() (see
1174 * trace_event_triggers.c).
1176 * @free: An optional de-initialization function called for the
1177 * trigger when the trigger is unregistered (via the
1178 * event_command @reg() function). This can be used to perform
1179 * per-trigger de-initialization such as decrementing a
1180 * per-trigger reference count and freeing corresponding trigger
1181 * data, for instance. This is usually implemented by the
1182 * generic utility function @event_trigger_free() (see
1183 * trace_event_triggers.c).
1185 * @print: The callback function invoked to have the trigger print
1186 * itself. This is usually implemented by a wrapper function
1187 * that calls the generic utility function @event_trigger_print()
1188 * (see trace_event_triggers.c).
1190 struct event_trigger_ops {
1191 void (*func)(struct event_trigger_data *data);
1192 int (*init)(struct event_trigger_ops *ops,
1193 struct event_trigger_data *data);
1194 void (*free)(struct event_trigger_ops *ops,
1195 struct event_trigger_data *data);
1196 int (*print)(struct seq_file *m,
1197 struct event_trigger_ops *ops,
1198 struct event_trigger_data *data);
1202 * struct event_command - callbacks and data members for event commands
1204 * Event commands are invoked by users by writing the command name
1205 * into the 'trigger' file associated with a trace event. The
1206 * parameters associated with a specific invocation of an event
1207 * command are used to create an event trigger instance, which is
1208 * added to the list of trigger instances associated with that trace
1209 * event. When the event is hit, the set of triggers associated with
1210 * that event is invoked.
1212 * The data members in this structure provide per-event command data
1213 * for various event commands.
1215 * All the data members below, except for @post_trigger, must be set
1216 * for each event command.
1218 * @name: The unique name that identifies the event command. This is
1219 * the name used when setting triggers via trigger files.
1221 * @trigger_type: A unique id that identifies the event command
1222 * 'type'. This value has two purposes, the first to ensure that
1223 * only one trigger of the same type can be set at a given time
1224 * for a particular event e.g. it doesn't make sense to have both
1225 * a traceon and traceoff trigger attached to a single event at
1226 * the same time, so traceon and traceoff have the same type
1227 * though they have different names. The @trigger_type value is
1228 * also used as a bit value for deferring the actual trigger
1229 * action until after the current event is finished. Some
1230 * commands need to do this if they themselves log to the trace
1231 * buffer (see the @post_trigger() member below). @trigger_type
1232 * values are defined by adding new values to the trigger_type
1233 * enum in include/linux/trace_events.h.
1235 * @post_trigger: A flag that says whether or not this command needs
1236 * to have its action delayed until after the current event has
1237 * been closed. Some triggers need to avoid being invoked while
1238 * an event is currently in the process of being logged, since
1239 * the trigger may itself log data into the trace buffer. Thus
1240 * we make sure the current event is committed before invoking
1241 * those triggers. To do that, the trigger invocation is split
1242 * in two - the first part checks the filter using the current
1243 * trace record; if a command has the @post_trigger flag set, it
1244 * sets a bit for itself in the return value, otherwise it
1245 * directly invokes the trigger. Once all commands have been
1246 * either invoked or set their return flag, the current record is
1247 * either committed or discarded. At that point, if any commands
1248 * have deferred their triggers, those commands are finally
1249 * invoked following the close of the current event. In other
1250 * words, if the event_trigger_ops @func() probe implementation
1251 * itself logs to the trace buffer, this flag should be set,
1252 * otherwise it can be left unspecified.
1254 * All the methods below, except for @set_filter(), must be
1257 * @func: The callback function responsible for parsing and
1258 * registering the trigger written to the 'trigger' file by the
1259 * user. It allocates the trigger instance and registers it with
1260 * the appropriate trace event. It makes use of the other
1261 * event_command callback functions to orchestrate this, and is
1262 * usually implemented by the generic utility function
1263 * @event_trigger_callback() (see trace_event_triggers.c).
1265 * @reg: Adds the trigger to the list of triggers associated with the
1266 * event, and enables the event trigger itself, after
1267 * initializing it (via the event_trigger_ops @init() function).
1268 * This is also where commands can use the @trigger_type value to
1269 * make the decision as to whether or not multiple instances of
1270 * the trigger should be allowed. This is usually implemented by
1271 * the generic utility function @register_trigger() (see
1272 * trace_event_triggers.c).
1274 * @unreg: Removes the trigger from the list of triggers associated
1275 * with the event, and disables the event trigger itself, after
1276 * initializing it (via the event_trigger_ops @free() function).
1277 * This is usually implemented by the generic utility function
1278 * @unregister_trigger() (see trace_event_triggers.c).
1280 * @set_filter: An optional function called to parse and set a filter
1281 * for the trigger. If no @set_filter() method is set for the
1282 * event command, filters set by the user for the command will be
1283 * ignored. This is usually implemented by the generic utility
1284 * function @set_trigger_filter() (see trace_event_triggers.c).
1286 * @get_trigger_ops: The callback function invoked to retrieve the
1287 * event_trigger_ops implementation associated with the command.
1289 struct event_command {
1290 struct list_head list;
1292 enum event_trigger_type trigger_type;
1294 int (*func)(struct event_command *cmd_ops,
1295 struct trace_event_file *file,
1296 char *glob, char *cmd, char *params);
1297 int (*reg)(char *glob,
1298 struct event_trigger_ops *ops,
1299 struct event_trigger_data *data,
1300 struct trace_event_file *file);
1301 void (*unreg)(char *glob,
1302 struct event_trigger_ops *ops,
1303 struct event_trigger_data *data,
1304 struct trace_event_file *file);
1305 int (*set_filter)(char *filter_str,
1306 struct event_trigger_data *data,
1307 struct trace_event_file *file);
1308 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1311 extern int trace_event_enable_disable(struct trace_event_file *file,
1312 int enable, int soft_disable);
1313 extern int tracing_alloc_snapshot(void);
1315 extern const char *__start___trace_bprintk_fmt[];
1316 extern const char *__stop___trace_bprintk_fmt[];
1318 extern const char *__start___tracepoint_str[];
1319 extern const char *__stop___tracepoint_str[];
1321 void trace_printk_control(bool enabled);
1322 void trace_printk_init_buffers(void);
1323 void trace_printk_start_comm(void);
1324 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1325 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1328 * Normal trace_printk() and friends allocates special buffers
1329 * to do the manipulation, as well as saves the print formats
1330 * into sections to display. But the trace infrastructure wants
1331 * to use these without the added overhead at the price of being
1332 * a bit slower (used mainly for warnings, where we don't care
1333 * about performance). The internal_trace_puts() is for such
1336 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1339 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1340 extern struct trace_event_call \
1341 __aligned(4) event_##call;
1342 #undef FTRACE_ENTRY_DUP
1343 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1344 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1346 #include "trace_entries.h"
1348 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1349 int perf_ftrace_event_register(struct trace_event_call *call,
1350 enum trace_reg type, void *data);
1352 #define perf_ftrace_event_register NULL
1355 #ifdef CONFIG_FTRACE_SYSCALLS
1356 void init_ftrace_syscalls(void);
1358 static inline void init_ftrace_syscalls(void) { }
1361 #ifdef CONFIG_EVENT_TRACING
1362 void trace_event_init(void);
1363 void trace_event_enum_update(struct trace_enum_map **map, int len);
1365 static inline void __init trace_event_init(void) { }
1366 static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { }
1369 extern struct trace_iterator *tracepoint_print_iter;
1371 #endif /* _LINUX_KERNEL_TRACE_H */