1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
5 #include <linux/atomic.h>
6 #include <linux/sched.h>
7 #include <linux/clocksource.h>
8 #include <linux/ring_buffer.h>
9 #include <linux/mmiotrace.h>
10 #include <linux/tracepoint.h>
11 #include <linux/ftrace.h>
12 #include <linux/hw_breakpoint.h>
13 #include <linux/trace_seq.h>
14 #include <linux/ftrace_event.h>
16 #ifdef CONFIG_FTRACE_SYSCALLS
17 #include <asm/unistd.h> /* For NR_SYSCALLS */
18 #include <asm/syscall.h> /* some archs define it here */
22 __TRACE_FIRST_TYPE = 0,
43 #define __field(type, item) type item;
46 #define __field_struct(type, item) __field(type, item)
49 #define __field_desc(type, container, item)
52 #define __array(type, item, size) type item[size];
55 #define __array_desc(type, container, item, size)
57 #undef __dynamic_array
58 #define __dynamic_array(type, item) type item[];
61 #define F_STRUCT(args...) args
64 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
65 struct struct_name { \
66 struct trace_entry ent; \
71 #define TP_ARGS(args...) args
73 #undef FTRACE_ENTRY_DUP
74 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
76 #undef FTRACE_ENTRY_REG
77 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
79 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
82 #include "trace_entries.h"
85 * syscalls are special, and need special handling, this is why
86 * they are not included in trace_entries.h
88 struct syscall_trace_enter {
89 struct trace_entry ent;
94 struct syscall_trace_exit {
95 struct trace_entry ent;
100 struct kprobe_trace_entry_head {
101 struct trace_entry ent;
105 struct kretprobe_trace_entry_head {
106 struct trace_entry ent;
108 unsigned long ret_ip;
111 struct uprobe_trace_entry_head {
112 struct trace_entry ent;
117 * trace_flag_type is an enumeration that holds different
118 * states when a trace occurs. These are:
119 * IRQS_OFF - interrupts were disabled
120 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
121 * NEED_RESCHED - reschedule is requested
122 * HARDIRQ - inside an interrupt handler
123 * SOFTIRQ - inside a softirq handler
125 enum trace_flag_type {
126 TRACE_FLAG_IRQS_OFF = 0x01,
127 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
128 TRACE_FLAG_NEED_RESCHED = 0x04,
129 TRACE_FLAG_HARDIRQ = 0x08,
130 TRACE_FLAG_SOFTIRQ = 0x10,
133 #define TRACE_BUF_SIZE 1024
138 struct trace_array *tr;
144 * The CPU trace array - it consists of thousands of trace entries
145 * plus some other descriptor data: (for example which task started
148 struct trace_array_cpu {
149 struct trace_cpu trace_cpu;
151 void *buffer_page; /* ring buffer spare */
153 unsigned long entries;
154 unsigned long saved_latency;
155 unsigned long critical_start;
156 unsigned long critical_end;
157 unsigned long critical_sequence;
159 unsigned long policy;
160 unsigned long rt_priority;
161 unsigned long skipped_entries;
162 cycle_t preempt_timestamp;
165 char comm[TASK_COMM_LEN];
170 struct trace_buffer {
171 struct trace_array *tr;
172 struct ring_buffer *buffer;
173 struct trace_array_cpu __percpu *data;
179 * The trace array - an array of per-CPU trace arrays. This is the
180 * highest level data structure that individual tracers deal with.
181 * They have on/off state as well:
184 struct list_head list;
186 struct trace_buffer trace_buffer;
187 #ifdef CONFIG_TRACER_MAX_TRACE
189 * The max_buffer is used to snapshot the trace when a maximum
190 * latency is reached, or when the user initiates a snapshot.
191 * Some tracers will use this to store a maximum trace while
192 * it continues examining live traces.
194 * The buffers for the max_buffer are set up the same as the trace_buffer
195 * When a snapshot is taken, the buffer of the max_buffer is swapped
196 * with the buffer of the trace_buffer and the buffers are reset for
197 * the trace_buffer so the tracing can continue.
199 struct trace_buffer max_buffer;
200 bool allocated_snapshot;
203 struct trace_cpu trace_cpu; /* place holder */
204 #ifdef CONFIG_FTRACE_SYSCALLS
205 int sys_refcount_enter;
206 int sys_refcount_exit;
207 DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
208 DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
212 struct tracer *current_trace;
214 raw_spinlock_t start_lock;
216 struct dentry *options;
217 struct dentry *percpu_dir;
218 struct dentry *event_dir;
219 struct list_head systems;
220 struct list_head events;
221 struct task_struct *waiter;
226 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
229 extern struct list_head ftrace_trace_arrays;
232 * The global tracer (top) should be the first trace array added,
233 * but we check the flag anyway.
235 static inline struct trace_array *top_trace_array(void)
237 struct trace_array *tr;
239 tr = list_entry(ftrace_trace_arrays.prev,
241 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
245 #define FTRACE_CMP_TYPE(var, type) \
246 __builtin_types_compatible_p(typeof(var), type *)
249 #define IF_ASSIGN(var, entry, etype, id) \
250 if (FTRACE_CMP_TYPE(var, etype)) { \
251 var = (typeof(var))(entry); \
252 WARN_ON(id && (entry)->type != id); \
256 /* Will cause compile errors if type is not found. */
257 extern void __ftrace_bad_type(void);
260 * The trace_assign_type is a verifier that the entry type is
261 * the same as the type being assigned. To add new types simply
262 * add a line with the following format:
264 * IF_ASSIGN(var, ent, type, id);
266 * Where "type" is the trace type that includes the trace_entry
267 * as the "ent" item. And "id" is the trace identifier that is
268 * used in the trace_type enum.
270 * If the type can have more than one id, then use zero.
272 #define trace_assign_type(var, ent) \
274 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
275 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
276 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
277 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
278 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
279 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
280 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
282 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
284 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
285 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
287 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
289 __ftrace_bad_type(); \
293 * An option specific to a tracer. This is a boolean value.
294 * The bit is the bit index that sets its value on the
295 * flags value in struct tracer_flags.
298 const char *name; /* Will appear on the trace_options file */
299 u32 bit; /* Mask assigned in val field in tracer_flags */
303 * The set of specific options for a tracer. Your tracer
304 * have to set the initial value of the flags val.
306 struct tracer_flags {
308 struct tracer_opt *opts;
311 /* Makes more easy to define a tracer opt */
312 #define TRACER_OPT(s, b) .name = #s, .bit = b
316 * struct tracer - a specific tracer and its callbacks to interact with debugfs
317 * @name: the name chosen to select it on the available_tracers file
318 * @init: called when one switches to this tracer (echo name > current_tracer)
319 * @reset: called when one switches to another tracer
320 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
321 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
322 * @open: called when the trace file is opened
323 * @pipe_open: called when the trace_pipe file is opened
324 * @wait_pipe: override how the user waits for traces on trace_pipe
325 * @close: called when the trace file is released
326 * @pipe_close: called when the trace_pipe file is released
327 * @read: override the default read callback on trace_pipe
328 * @splice_read: override the default splice_read callback on trace_pipe
329 * @selftest: selftest to run on boot (see trace_selftest.c)
330 * @print_headers: override the first lines that describe your columns
331 * @print_line: callback that prints a trace
332 * @set_flag: signals one of your private flags changed (trace_options file)
333 * @flags: your private flags
337 int (*init)(struct trace_array *tr);
338 void (*reset)(struct trace_array *tr);
339 void (*start)(struct trace_array *tr);
340 void (*stop)(struct trace_array *tr);
341 void (*open)(struct trace_iterator *iter);
342 void (*pipe_open)(struct trace_iterator *iter);
343 void (*wait_pipe)(struct trace_iterator *iter);
344 void (*close)(struct trace_iterator *iter);
345 void (*pipe_close)(struct trace_iterator *iter);
346 ssize_t (*read)(struct trace_iterator *iter,
347 struct file *filp, char __user *ubuf,
348 size_t cnt, loff_t *ppos);
349 ssize_t (*splice_read)(struct trace_iterator *iter,
352 struct pipe_inode_info *pipe,
355 #ifdef CONFIG_FTRACE_STARTUP_TEST
356 int (*selftest)(struct tracer *trace,
357 struct trace_array *tr);
359 void (*print_header)(struct seq_file *m);
360 enum print_line_t (*print_line)(struct trace_iterator *iter);
361 /* If you handled the flag setting, return 0 */
362 int (*set_flag)(u32 old_flags, u32 bit, int set);
363 /* Return 0 if OK with change, else return non-zero */
364 int (*flag_changed)(struct tracer *tracer,
367 struct tracer_flags *flags;
370 #ifdef CONFIG_TRACER_MAX_TRACE
376 /* Only current can touch trace_recursion */
379 * For function tracing recursion:
380 * The order of these bits are important.
382 * When function tracing occurs, the following steps are made:
383 * If arch does not support a ftrace feature:
384 * call internal function (uses INTERNAL bits) which calls...
385 * If callback is registered to the "global" list, the list
386 * function is called and recursion checks the GLOBAL bits.
387 * then this function calls...
388 * The function callback, which can use the FTRACE bits to
389 * check for recursion.
391 * Now if the arch does not suppport a feature, and it calls
392 * the global list function which calls the ftrace callback
393 * all three of these steps will do a recursion protection.
394 * There's no reason to do one if the previous caller already
395 * did. The recursion that we are protecting against will
396 * go through the same steps again.
398 * To prevent the multiple recursion checks, if a recursion
399 * bit is set that is higher than the MAX bit of the current
400 * check, then we know that the check was made by the previous
401 * caller, and we can skip the current check.
405 TRACE_BUFFER_NMI_BIT,
406 TRACE_BUFFER_IRQ_BIT,
407 TRACE_BUFFER_SIRQ_BIT,
409 /* Start of function recursion bits */
411 TRACE_FTRACE_NMI_BIT,
412 TRACE_FTRACE_IRQ_BIT,
413 TRACE_FTRACE_SIRQ_BIT,
415 /* GLOBAL_BITs must be greater than FTRACE_BITs */
417 TRACE_GLOBAL_NMI_BIT,
418 TRACE_GLOBAL_IRQ_BIT,
419 TRACE_GLOBAL_SIRQ_BIT,
421 /* INTERNAL_BITs must be greater than GLOBAL_BITs */
423 TRACE_INTERNAL_NMI_BIT,
424 TRACE_INTERNAL_IRQ_BIT,
425 TRACE_INTERNAL_SIRQ_BIT,
430 * Abuse of the trace_recursion.
431 * As we need a way to maintain state if we are tracing the function
432 * graph in irq because we want to trace a particular function that
433 * was called in irq context but we have irq tracing off. Since this
434 * can only be modified by current, we can reuse trace_recursion.
439 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
440 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
441 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
443 #define TRACE_CONTEXT_BITS 4
445 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
446 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
448 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT
449 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
451 #define TRACE_LIST_START TRACE_INTERNAL_BIT
452 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
454 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
456 static __always_inline int trace_get_context_bit(void)
460 if (in_interrupt()) {
474 static __always_inline int trace_test_and_set_recursion(int start, int max)
476 unsigned int val = current->trace_recursion;
479 /* A previous recursion check was made */
480 if ((val & TRACE_CONTEXT_MASK) > max)
483 bit = trace_get_context_bit() + start;
484 if (unlikely(val & (1 << bit)))
488 current->trace_recursion = val;
494 static __always_inline void trace_clear_recursion(int bit)
496 unsigned int val = current->trace_recursion;
505 current->trace_recursion = val;
508 static inline struct ring_buffer_iter *
509 trace_buffer_iter(struct trace_iterator *iter, int cpu)
511 if (iter->buffer_iter && iter->buffer_iter[cpu])
512 return iter->buffer_iter[cpu];
516 int tracer_init(struct tracer *t, struct trace_array *tr);
517 int tracing_is_enabled(void);
518 void tracing_reset(struct trace_buffer *buf, int cpu);
519 void tracing_reset_online_cpus(struct trace_buffer *buf);
520 void tracing_reset_current(int cpu);
521 void tracing_reset_all_online_cpus(void);
522 int tracing_open_generic(struct inode *inode, struct file *filp);
523 struct dentry *trace_create_file(const char *name,
525 struct dentry *parent,
527 const struct file_operations *fops);
529 struct dentry *tracing_init_dentry_tr(struct trace_array *tr);
530 struct dentry *tracing_init_dentry(void);
532 struct ring_buffer_event;
534 struct ring_buffer_event *
535 trace_buffer_lock_reserve(struct ring_buffer *buffer,
541 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
542 struct trace_array_cpu *data);
544 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
545 int *ent_cpu, u64 *ent_ts);
547 void __buffer_unlock_commit(struct ring_buffer *buffer,
548 struct ring_buffer_event *event);
550 int trace_empty(struct trace_iterator *iter);
552 void *trace_find_next_entry_inc(struct trace_iterator *iter);
554 void trace_init_global_iter(struct trace_iterator *iter);
556 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
558 void poll_wait_pipe(struct trace_iterator *iter);
560 void ftrace(struct trace_array *tr,
561 struct trace_array_cpu *data,
563 unsigned long parent_ip,
564 unsigned long flags, int pc);
565 void tracing_sched_switch_trace(struct trace_array *tr,
566 struct task_struct *prev,
567 struct task_struct *next,
568 unsigned long flags, int pc);
570 void tracing_sched_wakeup_trace(struct trace_array *tr,
571 struct task_struct *wakee,
572 struct task_struct *cur,
573 unsigned long flags, int pc);
574 void trace_function(struct trace_array *tr,
576 unsigned long parent_ip,
577 unsigned long flags, int pc);
578 void trace_graph_function(struct trace_array *tr,
580 unsigned long parent_ip,
581 unsigned long flags, int pc);
582 void trace_latency_header(struct seq_file *m);
583 void trace_default_header(struct seq_file *m);
584 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
585 int trace_empty(struct trace_iterator *iter);
587 void trace_graph_return(struct ftrace_graph_ret *trace);
588 int trace_graph_entry(struct ftrace_graph_ent *trace);
589 void set_graph_array(struct trace_array *tr);
591 void tracing_start_cmdline_record(void);
592 void tracing_stop_cmdline_record(void);
593 void tracing_sched_switch_assign_trace(struct trace_array *tr);
594 void tracing_stop_sched_switch_record(void);
595 void tracing_start_sched_switch_record(void);
596 int register_tracer(struct tracer *type);
597 int is_tracing_stopped(void);
599 extern cpumask_var_t __read_mostly tracing_buffer_mask;
601 #define for_each_tracing_cpu(cpu) \
602 for_each_cpu(cpu, tracing_buffer_mask)
604 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
606 extern unsigned long tracing_thresh;
608 #ifdef CONFIG_TRACER_MAX_TRACE
609 extern unsigned long tracing_max_latency;
611 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
612 void update_max_tr_single(struct trace_array *tr,
613 struct task_struct *tsk, int cpu);
614 #endif /* CONFIG_TRACER_MAX_TRACE */
616 #ifdef CONFIG_STACKTRACE
617 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
620 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
621 int skip, int pc, struct pt_regs *regs);
623 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
626 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
629 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
630 unsigned long flags, int skip, int pc)
634 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
635 unsigned long flags, int skip,
636 int pc, struct pt_regs *regs)
640 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
641 unsigned long flags, int pc)
645 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
649 #endif /* CONFIG_STACKTRACE */
651 extern cycle_t ftrace_now(int cpu);
653 extern void trace_find_cmdline(int pid, char comm[]);
655 #ifdef CONFIG_DYNAMIC_FTRACE
656 extern unsigned long ftrace_update_tot_cnt;
658 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
659 extern int DYN_FTRACE_TEST_NAME(void);
660 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
661 extern int DYN_FTRACE_TEST_NAME2(void);
663 extern bool ring_buffer_expanded;
664 extern bool tracing_selftest_disabled;
665 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
667 #ifdef CONFIG_FTRACE_STARTUP_TEST
668 extern int trace_selftest_startup_function(struct tracer *trace,
669 struct trace_array *tr);
670 extern int trace_selftest_startup_function_graph(struct tracer *trace,
671 struct trace_array *tr);
672 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
673 struct trace_array *tr);
674 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
675 struct trace_array *tr);
676 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
677 struct trace_array *tr);
678 extern int trace_selftest_startup_wakeup(struct tracer *trace,
679 struct trace_array *tr);
680 extern int trace_selftest_startup_nop(struct tracer *trace,
681 struct trace_array *tr);
682 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
683 struct trace_array *tr);
684 extern int trace_selftest_startup_branch(struct tracer *trace,
685 struct trace_array *tr);
686 #endif /* CONFIG_FTRACE_STARTUP_TEST */
688 extern void *head_page(struct trace_array_cpu *data);
689 extern unsigned long long ns2usecs(cycle_t nsec);
691 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
693 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
695 trace_array_vprintk(struct trace_array *tr,
696 unsigned long ip, const char *fmt, va_list args);
697 int trace_array_printk(struct trace_array *tr,
698 unsigned long ip, const char *fmt, ...);
699 int trace_array_printk_buf(struct ring_buffer *buffer,
700 unsigned long ip, const char *fmt, ...);
701 void trace_printk_seq(struct trace_seq *s);
702 enum print_line_t print_trace_line(struct trace_iterator *iter);
704 extern unsigned long trace_flags;
706 extern int trace_clock_id;
708 /* Standard output formatting function used for function return traces */
709 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
712 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
713 #define TRACE_GRAPH_PRINT_CPU 0x2
714 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
715 #define TRACE_GRAPH_PRINT_PROC 0x8
716 #define TRACE_GRAPH_PRINT_DURATION 0x10
717 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
719 extern enum print_line_t
720 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
721 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
722 extern enum print_line_t
723 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
724 extern void graph_trace_open(struct trace_iterator *iter);
725 extern void graph_trace_close(struct trace_iterator *iter);
726 extern int __trace_graph_entry(struct trace_array *tr,
727 struct ftrace_graph_ent *trace,
728 unsigned long flags, int pc);
729 extern void __trace_graph_return(struct trace_array *tr,
730 struct ftrace_graph_ret *trace,
731 unsigned long flags, int pc);
734 #ifdef CONFIG_DYNAMIC_FTRACE
735 /* TODO: make this variable */
736 #define FTRACE_GRAPH_MAX_FUNCS 32
737 extern int ftrace_graph_filter_enabled;
738 extern int ftrace_graph_count;
739 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
741 static inline int ftrace_graph_addr(unsigned long addr)
745 if (!ftrace_graph_filter_enabled)
748 for (i = 0; i < ftrace_graph_count; i++) {
749 if (addr == ftrace_graph_funcs[i]) {
751 * If no irqs are to be traced, but a set_graph_function
752 * is set, and called by an interrupt handler, we still
756 trace_recursion_set(TRACE_IRQ_BIT);
758 trace_recursion_clear(TRACE_IRQ_BIT);
766 static inline int ftrace_graph_addr(unsigned long addr)
770 #endif /* CONFIG_DYNAMIC_FTRACE */
771 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
772 static inline enum print_line_t
773 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
775 return TRACE_TYPE_UNHANDLED;
777 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
779 extern struct list_head ftrace_pids;
781 #ifdef CONFIG_FUNCTION_TRACER
782 static inline int ftrace_trace_task(struct task_struct *task)
784 if (list_empty(&ftrace_pids))
787 return test_tsk_trace_trace(task);
789 extern int ftrace_is_dead(void);
791 static inline int ftrace_trace_task(struct task_struct *task)
795 static inline int ftrace_is_dead(void) { return 0; }
798 int ftrace_event_is_function(struct ftrace_event_call *call);
801 * struct trace_parser - servers for reading the user input separated by spaces
802 * @cont: set if the input is not complete - no final space char was found
803 * @buffer: holds the parsed user input
804 * @idx: user input length
807 struct trace_parser {
814 static inline bool trace_parser_loaded(struct trace_parser *parser)
816 return (parser->idx != 0);
819 static inline bool trace_parser_cont(struct trace_parser *parser)
824 static inline void trace_parser_clear(struct trace_parser *parser)
826 parser->cont = false;
830 extern int trace_parser_get_init(struct trace_parser *parser, int size);
831 extern void trace_parser_put(struct trace_parser *parser);
832 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
833 size_t cnt, loff_t *ppos);
836 * trace_iterator_flags is an enumeration that defines bit
837 * positions into trace_flags that controls the output.
839 * NOTE: These bits must match the trace_options array in
842 enum trace_iterator_flags {
843 TRACE_ITER_PRINT_PARENT = 0x01,
844 TRACE_ITER_SYM_OFFSET = 0x02,
845 TRACE_ITER_SYM_ADDR = 0x04,
846 TRACE_ITER_VERBOSE = 0x08,
847 TRACE_ITER_RAW = 0x10,
848 TRACE_ITER_HEX = 0x20,
849 TRACE_ITER_BIN = 0x40,
850 TRACE_ITER_BLOCK = 0x80,
851 TRACE_ITER_STACKTRACE = 0x100,
852 TRACE_ITER_PRINTK = 0x200,
853 TRACE_ITER_PREEMPTONLY = 0x400,
854 TRACE_ITER_BRANCH = 0x800,
855 TRACE_ITER_ANNOTATE = 0x1000,
856 TRACE_ITER_USERSTACKTRACE = 0x2000,
857 TRACE_ITER_SYM_USEROBJ = 0x4000,
858 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
859 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
860 TRACE_ITER_LATENCY_FMT = 0x20000,
861 TRACE_ITER_SLEEP_TIME = 0x40000,
862 TRACE_ITER_GRAPH_TIME = 0x80000,
863 TRACE_ITER_RECORD_CMD = 0x100000,
864 TRACE_ITER_OVERWRITE = 0x200000,
865 TRACE_ITER_STOP_ON_FREE = 0x400000,
866 TRACE_ITER_IRQ_INFO = 0x800000,
867 TRACE_ITER_MARKERS = 0x1000000,
871 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
872 * control the output of kernel symbols.
874 #define TRACE_ITER_SYM_MASK \
875 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
877 extern struct tracer nop_trace;
879 #ifdef CONFIG_BRANCH_TRACER
880 extern int enable_branch_tracing(struct trace_array *tr);
881 extern void disable_branch_tracing(void);
882 static inline int trace_branch_enable(struct trace_array *tr)
884 if (trace_flags & TRACE_ITER_BRANCH)
885 return enable_branch_tracing(tr);
888 static inline void trace_branch_disable(void)
890 /* due to races, always disable */
891 disable_branch_tracing();
894 static inline int trace_branch_enable(struct trace_array *tr)
898 static inline void trace_branch_disable(void)
901 #endif /* CONFIG_BRANCH_TRACER */
903 /* set ring buffers to default size if not already done so */
904 int tracing_update_buffers(void);
906 /* trace event type bit fields, not numeric */
908 TRACE_EVENT_TYPE_PRINTF = 1,
909 TRACE_EVENT_TYPE_RAW = 2,
912 struct ftrace_event_field {
913 struct list_head link;
922 struct event_filter {
923 int n_preds; /* Number assigned */
924 int a_preds; /* allocated */
925 struct filter_pred *preds;
926 struct filter_pred *root;
930 struct event_subsystem {
931 struct list_head list;
933 struct event_filter *filter;
937 struct ftrace_subsystem_dir {
938 struct list_head list;
939 struct event_subsystem *subsystem;
940 struct trace_array *tr;
941 struct dentry *entry;
946 #define FILTER_PRED_INVALID ((unsigned short)-1)
947 #define FILTER_PRED_IS_RIGHT (1 << 15)
948 #define FILTER_PRED_FOLD (1 << 15)
951 * The max preds is the size of unsigned short with
952 * two flags at the MSBs. One bit is used for both the IS_RIGHT
953 * and FOLD flags. The other is reserved.
955 * 2^14 preds is way more than enough.
957 #define MAX_FILTER_PRED 16384
962 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
964 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
974 char pattern[MAX_FILTER_STR_VAL];
977 regex_match_func match;
985 struct ftrace_event_field *field;
989 unsigned short index;
990 unsigned short parent;
992 unsigned short right;
995 extern struct list_head ftrace_common_fields;
997 extern enum regex_type
998 filter_parse_regex(char *buff, int len, char **search, int *not);
999 extern void print_event_filter(struct ftrace_event_call *call,
1000 struct trace_seq *s);
1001 extern int apply_event_filter(struct ftrace_event_call *call,
1002 char *filter_string);
1003 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
1004 char *filter_string);
1005 extern void print_subsystem_event_filter(struct event_subsystem *system,
1006 struct trace_seq *s);
1007 extern int filter_assign_type(const char *type);
1010 trace_get_fields(struct ftrace_event_call *event_call);
1013 filter_check_discard(struct ftrace_event_call *call, void *rec,
1014 struct ring_buffer *buffer,
1015 struct ring_buffer_event *event)
1017 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
1018 !filter_match_preds(call->filter, rec)) {
1019 ring_buffer_discard_commit(buffer, event);
1026 extern void trace_event_enable_cmd_record(bool enable);
1027 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1028 extern int event_trace_del_tracer(struct trace_array *tr);
1030 extern struct mutex event_mutex;
1031 extern struct list_head ftrace_events;
1033 extern const char *__start___trace_bprintk_fmt[];
1034 extern const char *__stop___trace_bprintk_fmt[];
1036 void trace_printk_init_buffers(void);
1037 void trace_printk_start_comm(void);
1038 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1039 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1042 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1043 extern struct ftrace_event_call \
1044 __attribute__((__aligned__(4))) event_##call;
1045 #undef FTRACE_ENTRY_DUP
1046 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1047 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1049 #include "trace_entries.h"
1051 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1052 int perf_ftrace_event_register(struct ftrace_event_call *call,
1053 enum trace_reg type, void *data);
1055 #define perf_ftrace_event_register NULL
1058 #endif /* _LINUX_KERNEL_TRACE_H */