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>
17 __TRACE_FIRST_TYPE = 0,
38 #define __field(type, item) type item;
41 #define __field_struct(type, item) __field(type, item)
44 #define __field_desc(type, container, item)
47 #define __array(type, item, size) type item[size];
50 #define __array_desc(type, container, item, size)
52 #undef __dynamic_array
53 #define __dynamic_array(type, item) type item[];
56 #define F_STRUCT(args...) args
59 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
60 struct struct_name { \
61 struct trace_entry ent; \
66 #define TP_ARGS(args...) args
68 #undef FTRACE_ENTRY_DUP
69 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
71 #undef FTRACE_ENTRY_REG
72 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
74 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
77 #include "trace_entries.h"
80 * syscalls are special, and need special handling, this is why
81 * they are not included in trace_entries.h
83 struct syscall_trace_enter {
84 struct trace_entry ent;
89 struct syscall_trace_exit {
90 struct trace_entry ent;
95 struct kprobe_trace_entry_head {
96 struct trace_entry ent;
100 struct kretprobe_trace_entry_head {
101 struct trace_entry ent;
103 unsigned long ret_ip;
106 struct uprobe_trace_entry_head {
107 struct trace_entry ent;
112 * trace_flag_type is an enumeration that holds different
113 * states when a trace occurs. These are:
114 * IRQS_OFF - interrupts were disabled
115 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
116 * NEED_RESCHED - reschedule is requested
117 * HARDIRQ - inside an interrupt handler
118 * SOFTIRQ - inside a softirq handler
120 enum trace_flag_type {
121 TRACE_FLAG_IRQS_OFF = 0x01,
122 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
123 TRACE_FLAG_NEED_RESCHED = 0x04,
124 TRACE_FLAG_HARDIRQ = 0x08,
125 TRACE_FLAG_SOFTIRQ = 0x10,
128 #define TRACE_BUF_SIZE 1024
131 * The CPU trace array - it consists of thousands of trace entries
132 * plus some other descriptor data: (for example which task started
135 struct trace_array_cpu {
137 void *buffer_page; /* ring buffer spare */
139 unsigned long entries;
140 unsigned long saved_latency;
141 unsigned long critical_start;
142 unsigned long critical_end;
143 unsigned long critical_sequence;
145 unsigned long policy;
146 unsigned long rt_priority;
147 unsigned long skipped_entries;
148 cycle_t preempt_timestamp;
151 char comm[TASK_COMM_LEN];
155 * The trace array - an array of per-CPU trace arrays. This is the
156 * highest level data structure that individual tracers deal with.
157 * They have on/off state as well:
160 struct ring_buffer *buffer;
164 struct task_struct *waiter;
165 struct trace_array_cpu *data[NR_CPUS];
168 #define FTRACE_CMP_TYPE(var, type) \
169 __builtin_types_compatible_p(typeof(var), type *)
172 #define IF_ASSIGN(var, entry, etype, id) \
173 if (FTRACE_CMP_TYPE(var, etype)) { \
174 var = (typeof(var))(entry); \
175 WARN_ON(id && (entry)->type != id); \
179 /* Will cause compile errors if type is not found. */
180 extern void __ftrace_bad_type(void);
183 * The trace_assign_type is a verifier that the entry type is
184 * the same as the type being assigned. To add new types simply
185 * add a line with the following format:
187 * IF_ASSIGN(var, ent, type, id);
189 * Where "type" is the trace type that includes the trace_entry
190 * as the "ent" item. And "id" is the trace identifier that is
191 * used in the trace_type enum.
193 * If the type can have more than one id, then use zero.
195 #define trace_assign_type(var, ent) \
197 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
198 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
199 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
200 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
201 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
202 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
203 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
205 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
207 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
208 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
210 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
212 __ftrace_bad_type(); \
216 * An option specific to a tracer. This is a boolean value.
217 * The bit is the bit index that sets its value on the
218 * flags value in struct tracer_flags.
221 const char *name; /* Will appear on the trace_options file */
222 u32 bit; /* Mask assigned in val field in tracer_flags */
226 * The set of specific options for a tracer. Your tracer
227 * have to set the initial value of the flags val.
229 struct tracer_flags {
231 struct tracer_opt *opts;
234 /* Makes more easy to define a tracer opt */
235 #define TRACER_OPT(s, b) .name = #s, .bit = b
239 * struct tracer - a specific tracer and its callbacks to interact with debugfs
240 * @name: the name chosen to select it on the available_tracers file
241 * @init: called when one switches to this tracer (echo name > current_tracer)
242 * @reset: called when one switches to another tracer
243 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
244 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
245 * @open: called when the trace file is opened
246 * @pipe_open: called when the trace_pipe file is opened
247 * @wait_pipe: override how the user waits for traces on trace_pipe
248 * @close: called when the trace file is released
249 * @pipe_close: called when the trace_pipe file is released
250 * @read: override the default read callback on trace_pipe
251 * @splice_read: override the default splice_read callback on trace_pipe
252 * @selftest: selftest to run on boot (see trace_selftest.c)
253 * @print_headers: override the first lines that describe your columns
254 * @print_line: callback that prints a trace
255 * @set_flag: signals one of your private flags changed (trace_options file)
256 * @flags: your private flags
260 int (*init)(struct trace_array *tr);
261 void (*reset)(struct trace_array *tr);
262 void (*start)(struct trace_array *tr);
263 void (*stop)(struct trace_array *tr);
264 void (*open)(struct trace_iterator *iter);
265 void (*pipe_open)(struct trace_iterator *iter);
266 void (*wait_pipe)(struct trace_iterator *iter);
267 void (*close)(struct trace_iterator *iter);
268 void (*pipe_close)(struct trace_iterator *iter);
269 ssize_t (*read)(struct trace_iterator *iter,
270 struct file *filp, char __user *ubuf,
271 size_t cnt, loff_t *ppos);
272 ssize_t (*splice_read)(struct trace_iterator *iter,
275 struct pipe_inode_info *pipe,
278 #ifdef CONFIG_FTRACE_STARTUP_TEST
279 int (*selftest)(struct tracer *trace,
280 struct trace_array *tr);
282 void (*print_header)(struct seq_file *m);
283 enum print_line_t (*print_line)(struct trace_iterator *iter);
284 /* If you handled the flag setting, return 0 */
285 int (*set_flag)(u32 old_flags, u32 bit, int set);
287 struct tracer_flags *flags;
293 /* Only current can touch trace_recursion */
296 * For function tracing recursion:
297 * The order of these bits are important.
299 * When function tracing occurs, the following steps are made:
300 * If arch does not support a ftrace feature:
301 * call internal function (uses INTERNAL bits) which calls...
302 * If callback is registered to the "global" list, the list
303 * function is called and recursion checks the GLOBAL bits.
304 * then this function calls...
305 * The function callback, which can use the FTRACE bits to
306 * check for recursion.
308 * Now if the arch does not suppport a feature, and it calls
309 * the global list function which calls the ftrace callback
310 * all three of these steps will do a recursion protection.
311 * There's no reason to do one if the previous caller already
312 * did. The recursion that we are protecting against will
313 * go through the same steps again.
315 * To prevent the multiple recursion checks, if a recursion
316 * bit is set that is higher than the MAX bit of the current
317 * check, then we know that the check was made by the previous
318 * caller, and we can skip the current check.
322 TRACE_BUFFER_NMI_BIT,
323 TRACE_BUFFER_IRQ_BIT,
324 TRACE_BUFFER_SIRQ_BIT,
326 /* Start of function recursion bits */
328 TRACE_FTRACE_NMI_BIT,
329 TRACE_FTRACE_IRQ_BIT,
330 TRACE_FTRACE_SIRQ_BIT,
332 /* GLOBAL_BITs must be greater than FTRACE_BITs */
334 TRACE_GLOBAL_NMI_BIT,
335 TRACE_GLOBAL_IRQ_BIT,
336 TRACE_GLOBAL_SIRQ_BIT,
338 /* INTERNAL_BITs must be greater than GLOBAL_BITs */
340 TRACE_INTERNAL_NMI_BIT,
341 TRACE_INTERNAL_IRQ_BIT,
342 TRACE_INTERNAL_SIRQ_BIT,
347 * Abuse of the trace_recursion.
348 * As we need a way to maintain state if we are tracing the function
349 * graph in irq because we want to trace a particular function that
350 * was called in irq context but we have irq tracing off. Since this
351 * can only be modified by current, we can reuse trace_recursion.
356 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
357 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
358 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
360 #define TRACE_CONTEXT_BITS 4
362 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
363 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
365 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT
366 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
368 #define TRACE_LIST_START TRACE_INTERNAL_BIT
369 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
371 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
373 static __always_inline int trace_get_context_bit(void)
377 if (in_interrupt()) {
391 static __always_inline int trace_test_and_set_recursion(int start, int max)
393 unsigned int val = current->trace_recursion;
396 /* A previous recursion check was made */
397 if ((val & TRACE_CONTEXT_MASK) > max)
400 bit = trace_get_context_bit() + start;
401 if (unlikely(val & (1 << bit)))
405 current->trace_recursion = val;
411 static __always_inline void trace_clear_recursion(int bit)
413 unsigned int val = current->trace_recursion;
422 current->trace_recursion = val;
425 #define TRACE_PIPE_ALL_CPU -1
427 static inline struct ring_buffer_iter *
428 trace_buffer_iter(struct trace_iterator *iter, int cpu)
430 if (iter->buffer_iter && iter->buffer_iter[cpu])
431 return iter->buffer_iter[cpu];
435 int tracer_init(struct tracer *t, struct trace_array *tr);
436 int tracing_is_enabled(void);
437 void tracing_reset(struct trace_array *tr, int cpu);
438 void tracing_reset_online_cpus(struct trace_array *tr);
439 void tracing_reset_current(int cpu);
440 void tracing_reset_current_online_cpus(void);
441 int tracing_open_generic(struct inode *inode, struct file *filp);
442 struct dentry *trace_create_file(const char *name,
444 struct dentry *parent,
446 const struct file_operations *fops);
448 struct dentry *tracing_init_dentry(void);
450 struct ring_buffer_event;
452 struct ring_buffer_event *
453 trace_buffer_lock_reserve(struct ring_buffer *buffer,
459 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
460 struct trace_array_cpu *data);
462 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
463 int *ent_cpu, u64 *ent_ts);
465 void __buffer_unlock_commit(struct ring_buffer *buffer,
466 struct ring_buffer_event *event);
468 int trace_empty(struct trace_iterator *iter);
470 void *trace_find_next_entry_inc(struct trace_iterator *iter);
472 void trace_init_global_iter(struct trace_iterator *iter);
474 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
476 void poll_wait_pipe(struct trace_iterator *iter);
478 void ftrace(struct trace_array *tr,
479 struct trace_array_cpu *data,
481 unsigned long parent_ip,
482 unsigned long flags, int pc);
483 void tracing_sched_switch_trace(struct trace_array *tr,
484 struct task_struct *prev,
485 struct task_struct *next,
486 unsigned long flags, int pc);
488 void tracing_sched_wakeup_trace(struct trace_array *tr,
489 struct task_struct *wakee,
490 struct task_struct *cur,
491 unsigned long flags, int pc);
492 void trace_function(struct trace_array *tr,
494 unsigned long parent_ip,
495 unsigned long flags, int pc);
496 void trace_graph_function(struct trace_array *tr,
498 unsigned long parent_ip,
499 unsigned long flags, int pc);
500 void trace_latency_header(struct seq_file *m);
501 void trace_default_header(struct seq_file *m);
502 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
503 int trace_empty(struct trace_iterator *iter);
505 void trace_graph_return(struct ftrace_graph_ret *trace);
506 int trace_graph_entry(struct ftrace_graph_ent *trace);
507 void set_graph_array(struct trace_array *tr);
509 void tracing_start_cmdline_record(void);
510 void tracing_stop_cmdline_record(void);
511 void tracing_sched_switch_assign_trace(struct trace_array *tr);
512 void tracing_stop_sched_switch_record(void);
513 void tracing_start_sched_switch_record(void);
514 int register_tracer(struct tracer *type);
515 int is_tracing_stopped(void);
517 extern cpumask_var_t __read_mostly tracing_buffer_mask;
519 #define for_each_tracing_cpu(cpu) \
520 for_each_cpu(cpu, tracing_buffer_mask)
522 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
524 extern unsigned long tracing_thresh;
526 #ifdef CONFIG_TRACER_MAX_TRACE
527 extern unsigned long tracing_max_latency;
529 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
530 void update_max_tr_single(struct trace_array *tr,
531 struct task_struct *tsk, int cpu);
532 #endif /* CONFIG_TRACER_MAX_TRACE */
534 #ifdef CONFIG_STACKTRACE
535 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
538 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
539 int skip, int pc, struct pt_regs *regs);
541 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
544 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
547 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
548 unsigned long flags, int skip, int pc)
552 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
553 unsigned long flags, int skip,
554 int pc, struct pt_regs *regs)
558 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
559 unsigned long flags, int pc)
563 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
567 #endif /* CONFIG_STACKTRACE */
569 extern cycle_t ftrace_now(int cpu);
571 extern void trace_find_cmdline(int pid, char comm[]);
573 #ifdef CONFIG_DYNAMIC_FTRACE
574 extern unsigned long ftrace_update_tot_cnt;
576 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
577 extern int DYN_FTRACE_TEST_NAME(void);
578 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
579 extern int DYN_FTRACE_TEST_NAME2(void);
581 extern int ring_buffer_expanded;
582 extern bool tracing_selftest_disabled;
583 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
585 #ifdef CONFIG_FTRACE_STARTUP_TEST
586 extern int trace_selftest_startup_function(struct tracer *trace,
587 struct trace_array *tr);
588 extern int trace_selftest_startup_function_graph(struct tracer *trace,
589 struct trace_array *tr);
590 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
591 struct trace_array *tr);
592 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
593 struct trace_array *tr);
594 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
595 struct trace_array *tr);
596 extern int trace_selftest_startup_wakeup(struct tracer *trace,
597 struct trace_array *tr);
598 extern int trace_selftest_startup_nop(struct tracer *trace,
599 struct trace_array *tr);
600 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
601 struct trace_array *tr);
602 extern int trace_selftest_startup_branch(struct tracer *trace,
603 struct trace_array *tr);
604 #endif /* CONFIG_FTRACE_STARTUP_TEST */
606 extern void *head_page(struct trace_array_cpu *data);
607 extern unsigned long long ns2usecs(cycle_t nsec);
609 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
611 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
613 trace_array_vprintk(struct trace_array *tr,
614 unsigned long ip, const char *fmt, va_list args);
615 int trace_array_printk(struct trace_array *tr,
616 unsigned long ip, const char *fmt, ...);
617 void trace_printk_seq(struct trace_seq *s);
618 enum print_line_t print_trace_line(struct trace_iterator *iter);
620 extern unsigned long trace_flags;
622 extern int trace_clock_id;
624 /* Standard output formatting function used for function return traces */
625 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
628 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
629 #define TRACE_GRAPH_PRINT_CPU 0x2
630 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
631 #define TRACE_GRAPH_PRINT_PROC 0x8
632 #define TRACE_GRAPH_PRINT_DURATION 0x10
633 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
635 extern enum print_line_t
636 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
637 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
638 extern enum print_line_t
639 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
640 extern void graph_trace_open(struct trace_iterator *iter);
641 extern void graph_trace_close(struct trace_iterator *iter);
642 extern int __trace_graph_entry(struct trace_array *tr,
643 struct ftrace_graph_ent *trace,
644 unsigned long flags, int pc);
645 extern void __trace_graph_return(struct trace_array *tr,
646 struct ftrace_graph_ret *trace,
647 unsigned long flags, int pc);
650 #ifdef CONFIG_DYNAMIC_FTRACE
651 /* TODO: make this variable */
652 #define FTRACE_GRAPH_MAX_FUNCS 32
653 extern int ftrace_graph_filter_enabled;
654 extern int ftrace_graph_count;
655 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
657 static inline int ftrace_graph_addr(unsigned long addr)
661 if (!ftrace_graph_filter_enabled)
664 for (i = 0; i < ftrace_graph_count; i++) {
665 if (addr == ftrace_graph_funcs[i]) {
667 * If no irqs are to be traced, but a set_graph_function
668 * is set, and called by an interrupt handler, we still
672 trace_recursion_set(TRACE_IRQ_BIT);
674 trace_recursion_clear(TRACE_IRQ_BIT);
682 static inline int ftrace_graph_addr(unsigned long addr)
686 #endif /* CONFIG_DYNAMIC_FTRACE */
687 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
688 static inline enum print_line_t
689 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
691 return TRACE_TYPE_UNHANDLED;
693 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
695 extern struct list_head ftrace_pids;
697 #ifdef CONFIG_FUNCTION_TRACER
698 static inline int ftrace_trace_task(struct task_struct *task)
700 if (list_empty(&ftrace_pids))
703 return test_tsk_trace_trace(task);
705 extern int ftrace_is_dead(void);
707 static inline int ftrace_trace_task(struct task_struct *task)
711 static inline int ftrace_is_dead(void) { return 0; }
714 int ftrace_event_is_function(struct ftrace_event_call *call);
717 * struct trace_parser - servers for reading the user input separated by spaces
718 * @cont: set if the input is not complete - no final space char was found
719 * @buffer: holds the parsed user input
720 * @idx: user input length
723 struct trace_parser {
730 static inline bool trace_parser_loaded(struct trace_parser *parser)
732 return (parser->idx != 0);
735 static inline bool trace_parser_cont(struct trace_parser *parser)
740 static inline void trace_parser_clear(struct trace_parser *parser)
742 parser->cont = false;
746 extern int trace_parser_get_init(struct trace_parser *parser, int size);
747 extern void trace_parser_put(struct trace_parser *parser);
748 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
749 size_t cnt, loff_t *ppos);
752 * trace_iterator_flags is an enumeration that defines bit
753 * positions into trace_flags that controls the output.
755 * NOTE: These bits must match the trace_options array in
758 enum trace_iterator_flags {
759 TRACE_ITER_PRINT_PARENT = 0x01,
760 TRACE_ITER_SYM_OFFSET = 0x02,
761 TRACE_ITER_SYM_ADDR = 0x04,
762 TRACE_ITER_VERBOSE = 0x08,
763 TRACE_ITER_RAW = 0x10,
764 TRACE_ITER_HEX = 0x20,
765 TRACE_ITER_BIN = 0x40,
766 TRACE_ITER_BLOCK = 0x80,
767 TRACE_ITER_STACKTRACE = 0x100,
768 TRACE_ITER_PRINTK = 0x200,
769 TRACE_ITER_PREEMPTONLY = 0x400,
770 TRACE_ITER_BRANCH = 0x800,
771 TRACE_ITER_ANNOTATE = 0x1000,
772 TRACE_ITER_USERSTACKTRACE = 0x2000,
773 TRACE_ITER_SYM_USEROBJ = 0x4000,
774 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
775 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
776 TRACE_ITER_LATENCY_FMT = 0x20000,
777 TRACE_ITER_SLEEP_TIME = 0x40000,
778 TRACE_ITER_GRAPH_TIME = 0x80000,
779 TRACE_ITER_RECORD_CMD = 0x100000,
780 TRACE_ITER_OVERWRITE = 0x200000,
781 TRACE_ITER_STOP_ON_FREE = 0x400000,
782 TRACE_ITER_IRQ_INFO = 0x800000,
783 TRACE_ITER_MARKERS = 0x1000000,
787 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
788 * control the output of kernel symbols.
790 #define TRACE_ITER_SYM_MASK \
791 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
793 extern struct tracer nop_trace;
795 #ifdef CONFIG_BRANCH_TRACER
796 extern int enable_branch_tracing(struct trace_array *tr);
797 extern void disable_branch_tracing(void);
798 static inline int trace_branch_enable(struct trace_array *tr)
800 if (trace_flags & TRACE_ITER_BRANCH)
801 return enable_branch_tracing(tr);
804 static inline void trace_branch_disable(void)
806 /* due to races, always disable */
807 disable_branch_tracing();
810 static inline int trace_branch_enable(struct trace_array *tr)
814 static inline void trace_branch_disable(void)
817 #endif /* CONFIG_BRANCH_TRACER */
819 /* set ring buffers to default size if not already done so */
820 int tracing_update_buffers(void);
822 /* trace event type bit fields, not numeric */
824 TRACE_EVENT_TYPE_PRINTF = 1,
825 TRACE_EVENT_TYPE_RAW = 2,
828 struct ftrace_event_field {
829 struct list_head link;
838 struct event_filter {
839 int n_preds; /* Number assigned */
840 int a_preds; /* allocated */
841 struct filter_pred *preds;
842 struct filter_pred *root;
846 struct event_subsystem {
847 struct list_head list;
849 struct dentry *entry;
850 struct event_filter *filter;
855 #define FILTER_PRED_INVALID ((unsigned short)-1)
856 #define FILTER_PRED_IS_RIGHT (1 << 15)
857 #define FILTER_PRED_FOLD (1 << 15)
860 * The max preds is the size of unsigned short with
861 * two flags at the MSBs. One bit is used for both the IS_RIGHT
862 * and FOLD flags. The other is reserved.
864 * 2^14 preds is way more than enough.
866 #define MAX_FILTER_PRED 16384
871 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
873 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
883 char pattern[MAX_FILTER_STR_VAL];
886 regex_match_func match;
894 struct ftrace_event_field *field;
898 unsigned short index;
899 unsigned short parent;
901 unsigned short right;
904 extern struct list_head ftrace_common_fields;
906 extern enum regex_type
907 filter_parse_regex(char *buff, int len, char **search, int *not);
908 extern void print_event_filter(struct ftrace_event_call *call,
909 struct trace_seq *s);
910 extern int apply_event_filter(struct ftrace_event_call *call,
911 char *filter_string);
912 extern int apply_subsystem_event_filter(struct event_subsystem *system,
913 char *filter_string);
914 extern void print_subsystem_event_filter(struct event_subsystem *system,
915 struct trace_seq *s);
916 extern int filter_assign_type(const char *type);
919 trace_get_fields(struct ftrace_event_call *event_call);
922 filter_check_discard(struct ftrace_event_call *call, void *rec,
923 struct ring_buffer *buffer,
924 struct ring_buffer_event *event)
926 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
927 !filter_match_preds(call->filter, rec)) {
928 ring_buffer_discard_commit(buffer, event);
935 extern void trace_event_enable_cmd_record(bool enable);
937 extern struct mutex event_mutex;
938 extern struct list_head ftrace_events;
940 extern const char *__start___trace_bprintk_fmt[];
941 extern const char *__stop___trace_bprintk_fmt[];
943 void trace_printk_init_buffers(void);
944 void trace_printk_start_comm(void);
947 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
948 extern struct ftrace_event_call \
949 __attribute__((__aligned__(4))) event_##call;
950 #undef FTRACE_ENTRY_DUP
951 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
952 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
954 #include "trace_entries.h"
956 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
957 int perf_ftrace_event_register(struct ftrace_event_call *call,
958 enum trace_reg type, void *data);
960 #define perf_ftrace_event_register NULL
963 #endif /* _LINUX_KERNEL_TRACE_H */