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,
44 #define __field(type, item) type item;
47 #define __field_struct(type, item) __field(type, item)
50 #define __field_desc(type, container, item)
53 #define __array(type, item, size) type item[size];
56 #define __array_desc(type, container, item, size)
58 #undef __dynamic_array
59 #define __dynamic_array(type, item) type item[];
62 #define F_STRUCT(args...) args
65 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
66 struct struct_name { \
67 struct trace_entry ent; \
72 #define TP_ARGS(args...) args
74 #undef FTRACE_ENTRY_DUP
75 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
77 #undef FTRACE_ENTRY_REG
78 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
80 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
83 #include "trace_entries.h"
86 * syscalls are special, and need special handling, this is why
87 * they are not included in trace_entries.h
89 struct syscall_trace_enter {
90 struct trace_entry ent;
95 struct syscall_trace_exit {
96 struct trace_entry ent;
101 struct kprobe_trace_entry_head {
102 struct trace_entry ent;
106 struct kretprobe_trace_entry_head {
107 struct trace_entry ent;
109 unsigned long ret_ip;
113 * trace_flag_type is an enumeration that holds different
114 * states when a trace occurs. These are:
115 * IRQS_OFF - interrupts were disabled
116 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
117 * NEED_RESCHED - reschedule is requested
118 * HARDIRQ - inside an interrupt handler
119 * SOFTIRQ - inside a softirq handler
121 enum trace_flag_type {
122 TRACE_FLAG_IRQS_OFF = 0x01,
123 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
124 TRACE_FLAG_NEED_RESCHED = 0x04,
125 TRACE_FLAG_HARDIRQ = 0x08,
126 TRACE_FLAG_SOFTIRQ = 0x10,
127 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
130 #define TRACE_BUF_SIZE 1024
135 * The CPU trace array - it consists of thousands of trace entries
136 * plus some other descriptor data: (for example which task started
139 struct trace_array_cpu {
141 void *buffer_page; /* ring buffer spare */
143 unsigned long entries;
144 unsigned long saved_latency;
145 unsigned long critical_start;
146 unsigned long critical_end;
147 unsigned long critical_sequence;
149 unsigned long policy;
150 unsigned long rt_priority;
151 unsigned long skipped_entries;
152 cycle_t preempt_timestamp;
155 char comm[TASK_COMM_LEN];
160 struct trace_buffer {
161 struct trace_array *tr;
162 struct ring_buffer *buffer;
163 struct trace_array_cpu __percpu *data;
169 * The trace array - an array of per-CPU trace arrays. This is the
170 * highest level data structure that individual tracers deal with.
171 * They have on/off state as well:
174 struct list_head list;
176 struct trace_buffer trace_buffer;
177 #ifdef CONFIG_TRACER_MAX_TRACE
179 * The max_buffer is used to snapshot the trace when a maximum
180 * latency is reached, or when the user initiates a snapshot.
181 * Some tracers will use this to store a maximum trace while
182 * it continues examining live traces.
184 * The buffers for the max_buffer are set up the same as the trace_buffer
185 * When a snapshot is taken, the buffer of the max_buffer is swapped
186 * with the buffer of the trace_buffer and the buffers are reset for
187 * the trace_buffer so the tracing can continue.
189 struct trace_buffer max_buffer;
190 bool allocated_snapshot;
193 #ifdef CONFIG_FTRACE_SYSCALLS
194 int sys_refcount_enter;
195 int sys_refcount_exit;
196 DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
197 DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
201 struct tracer *current_trace;
203 raw_spinlock_t start_lock;
205 struct dentry *options;
206 struct dentry *percpu_dir;
207 struct dentry *event_dir;
208 struct list_head systems;
209 struct list_head events;
210 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
215 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
218 extern struct list_head ftrace_trace_arrays;
220 extern struct mutex trace_types_lock;
222 extern int trace_array_get(struct trace_array *tr);
223 extern void trace_array_put(struct trace_array *tr);
226 * The global tracer (top) should be the first trace array added,
227 * but we check the flag anyway.
229 static inline struct trace_array *top_trace_array(void)
231 struct trace_array *tr;
233 tr = list_entry(ftrace_trace_arrays.prev,
235 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
239 #define FTRACE_CMP_TYPE(var, type) \
240 __builtin_types_compatible_p(typeof(var), type *)
243 #define IF_ASSIGN(var, entry, etype, id) \
244 if (FTRACE_CMP_TYPE(var, etype)) { \
245 var = (typeof(var))(entry); \
246 WARN_ON(id && (entry)->type != id); \
250 /* Will cause compile errors if type is not found. */
251 extern void __ftrace_bad_type(void);
254 * The trace_assign_type is a verifier that the entry type is
255 * the same as the type being assigned. To add new types simply
256 * add a line with the following format:
258 * IF_ASSIGN(var, ent, type, id);
260 * Where "type" is the trace type that includes the trace_entry
261 * as the "ent" item. And "id" is the trace identifier that is
262 * used in the trace_type enum.
264 * If the type can have more than one id, then use zero.
266 #define trace_assign_type(var, ent) \
268 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
269 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
270 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
271 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
272 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
273 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
274 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
275 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
277 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
279 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
280 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
282 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
284 __ftrace_bad_type(); \
288 * An option specific to a tracer. This is a boolean value.
289 * The bit is the bit index that sets its value on the
290 * flags value in struct tracer_flags.
293 const char *name; /* Will appear on the trace_options file */
294 u32 bit; /* Mask assigned in val field in tracer_flags */
298 * The set of specific options for a tracer. Your tracer
299 * have to set the initial value of the flags val.
301 struct tracer_flags {
303 struct tracer_opt *opts;
306 /* Makes more easy to define a tracer opt */
307 #define TRACER_OPT(s, b) .name = #s, .bit = b
311 * struct tracer - a specific tracer and its callbacks to interact with debugfs
312 * @name: the name chosen to select it on the available_tracers file
313 * @init: called when one switches to this tracer (echo name > current_tracer)
314 * @reset: called when one switches to another tracer
315 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
316 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
317 * @open: called when the trace file is opened
318 * @pipe_open: called when the trace_pipe file is opened
319 * @wait_pipe: override how the user waits for traces on trace_pipe
320 * @close: called when the trace file is released
321 * @pipe_close: called when the trace_pipe file is released
322 * @read: override the default read callback on trace_pipe
323 * @splice_read: override the default splice_read callback on trace_pipe
324 * @selftest: selftest to run on boot (see trace_selftest.c)
325 * @print_headers: override the first lines that describe your columns
326 * @print_line: callback that prints a trace
327 * @set_flag: signals one of your private flags changed (trace_options file)
328 * @flags: your private flags
332 int (*init)(struct trace_array *tr);
333 void (*reset)(struct trace_array *tr);
334 void (*start)(struct trace_array *tr);
335 void (*stop)(struct trace_array *tr);
336 void (*open)(struct trace_iterator *iter);
337 void (*pipe_open)(struct trace_iterator *iter);
338 void (*wait_pipe)(struct trace_iterator *iter);
339 void (*close)(struct trace_iterator *iter);
340 void (*pipe_close)(struct trace_iterator *iter);
341 ssize_t (*read)(struct trace_iterator *iter,
342 struct file *filp, char __user *ubuf,
343 size_t cnt, loff_t *ppos);
344 ssize_t (*splice_read)(struct trace_iterator *iter,
347 struct pipe_inode_info *pipe,
350 #ifdef CONFIG_FTRACE_STARTUP_TEST
351 int (*selftest)(struct tracer *trace,
352 struct trace_array *tr);
354 void (*print_header)(struct seq_file *m);
355 enum print_line_t (*print_line)(struct trace_iterator *iter);
356 /* If you handled the flag setting, return 0 */
357 int (*set_flag)(u32 old_flags, u32 bit, int set);
358 /* Return 0 if OK with change, else return non-zero */
359 int (*flag_changed)(struct tracer *tracer,
362 struct tracer_flags *flags;
365 #ifdef CONFIG_TRACER_MAX_TRACE
371 /* Only current can touch trace_recursion */
374 * For function tracing recursion:
375 * The order of these bits are important.
377 * When function tracing occurs, the following steps are made:
378 * If arch does not support a ftrace feature:
379 * call internal function (uses INTERNAL bits) which calls...
380 * If callback is registered to the "global" list, the list
381 * function is called and recursion checks the GLOBAL bits.
382 * then this function calls...
383 * The function callback, which can use the FTRACE bits to
384 * check for recursion.
386 * Now if the arch does not suppport a feature, and it calls
387 * the global list function which calls the ftrace callback
388 * all three of these steps will do a recursion protection.
389 * There's no reason to do one if the previous caller already
390 * did. The recursion that we are protecting against will
391 * go through the same steps again.
393 * To prevent the multiple recursion checks, if a recursion
394 * bit is set that is higher than the MAX bit of the current
395 * check, then we know that the check was made by the previous
396 * caller, and we can skip the current check.
400 TRACE_BUFFER_NMI_BIT,
401 TRACE_BUFFER_IRQ_BIT,
402 TRACE_BUFFER_SIRQ_BIT,
404 /* Start of function recursion bits */
406 TRACE_FTRACE_NMI_BIT,
407 TRACE_FTRACE_IRQ_BIT,
408 TRACE_FTRACE_SIRQ_BIT,
410 /* GLOBAL_BITs must be greater than FTRACE_BITs */
412 TRACE_GLOBAL_NMI_BIT,
413 TRACE_GLOBAL_IRQ_BIT,
414 TRACE_GLOBAL_SIRQ_BIT,
416 /* INTERNAL_BITs must be greater than GLOBAL_BITs */
418 TRACE_INTERNAL_NMI_BIT,
419 TRACE_INTERNAL_IRQ_BIT,
420 TRACE_INTERNAL_SIRQ_BIT,
425 * Abuse of the trace_recursion.
426 * As we need a way to maintain state if we are tracing the function
427 * graph in irq because we want to trace a particular function that
428 * was called in irq context but we have irq tracing off. Since this
429 * can only be modified by current, we can reuse trace_recursion.
434 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
435 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
436 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
438 #define TRACE_CONTEXT_BITS 4
440 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
441 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
443 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT
444 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
446 #define TRACE_LIST_START TRACE_INTERNAL_BIT
447 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
449 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
451 static __always_inline int trace_get_context_bit(void)
455 if (in_interrupt()) {
469 static __always_inline int trace_test_and_set_recursion(int start, int max)
471 unsigned int val = current->trace_recursion;
474 /* A previous recursion check was made */
475 if ((val & TRACE_CONTEXT_MASK) > max)
478 bit = trace_get_context_bit() + start;
479 if (unlikely(val & (1 << bit)))
483 current->trace_recursion = val;
489 static __always_inline void trace_clear_recursion(int bit)
491 unsigned int val = current->trace_recursion;
500 current->trace_recursion = val;
503 static inline struct ring_buffer_iter *
504 trace_buffer_iter(struct trace_iterator *iter, int cpu)
506 if (iter->buffer_iter && iter->buffer_iter[cpu])
507 return iter->buffer_iter[cpu];
511 int tracer_init(struct tracer *t, struct trace_array *tr);
512 int tracing_is_enabled(void);
513 void tracing_reset(struct trace_buffer *buf, int cpu);
514 void tracing_reset_online_cpus(struct trace_buffer *buf);
515 void tracing_reset_current(int cpu);
516 void tracing_reset_all_online_cpus(void);
517 int tracing_open_generic(struct inode *inode, struct file *filp);
518 struct dentry *trace_create_file(const char *name,
520 struct dentry *parent,
522 const struct file_operations *fops);
524 struct dentry *tracing_init_dentry_tr(struct trace_array *tr);
525 struct dentry *tracing_init_dentry(void);
527 struct ring_buffer_event;
529 struct ring_buffer_event *
530 trace_buffer_lock_reserve(struct ring_buffer *buffer,
536 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
537 struct trace_array_cpu *data);
539 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
540 int *ent_cpu, u64 *ent_ts);
542 void __buffer_unlock_commit(struct ring_buffer *buffer,
543 struct ring_buffer_event *event);
545 int trace_empty(struct trace_iterator *iter);
547 void *trace_find_next_entry_inc(struct trace_iterator *iter);
549 void trace_init_global_iter(struct trace_iterator *iter);
551 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
553 void poll_wait_pipe(struct trace_iterator *iter);
555 void tracing_sched_switch_trace(struct trace_array *tr,
556 struct task_struct *prev,
557 struct task_struct *next,
558 unsigned long flags, int pc);
560 void tracing_sched_wakeup_trace(struct trace_array *tr,
561 struct task_struct *wakee,
562 struct task_struct *cur,
563 unsigned long flags, int pc);
564 void trace_function(struct trace_array *tr,
566 unsigned long parent_ip,
567 unsigned long flags, int pc);
568 void trace_graph_function(struct trace_array *tr,
570 unsigned long parent_ip,
571 unsigned long flags, int pc);
572 void trace_latency_header(struct seq_file *m);
573 void trace_default_header(struct seq_file *m);
574 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
575 int trace_empty(struct trace_iterator *iter);
577 void trace_graph_return(struct ftrace_graph_ret *trace);
578 int trace_graph_entry(struct ftrace_graph_ent *trace);
579 void set_graph_array(struct trace_array *tr);
581 void tracing_start_cmdline_record(void);
582 void tracing_stop_cmdline_record(void);
583 void tracing_sched_switch_assign_trace(struct trace_array *tr);
584 void tracing_stop_sched_switch_record(void);
585 void tracing_start_sched_switch_record(void);
586 int register_tracer(struct tracer *type);
587 int is_tracing_stopped(void);
589 extern cpumask_var_t __read_mostly tracing_buffer_mask;
591 #define for_each_tracing_cpu(cpu) \
592 for_each_cpu(cpu, tracing_buffer_mask)
594 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
596 extern unsigned long tracing_thresh;
598 #ifdef CONFIG_TRACER_MAX_TRACE
599 extern unsigned long tracing_max_latency;
601 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
602 void update_max_tr_single(struct trace_array *tr,
603 struct task_struct *tsk, int cpu);
604 #endif /* CONFIG_TRACER_MAX_TRACE */
606 #ifdef CONFIG_STACKTRACE
607 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
610 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
611 int skip, int pc, struct pt_regs *regs);
613 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
616 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
619 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
620 unsigned long flags, int skip, int pc)
624 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
625 unsigned long flags, int skip,
626 int pc, struct pt_regs *regs)
630 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
631 unsigned long flags, int pc)
635 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
639 #endif /* CONFIG_STACKTRACE */
641 extern cycle_t ftrace_now(int cpu);
643 extern void trace_find_cmdline(int pid, char comm[]);
645 #ifdef CONFIG_DYNAMIC_FTRACE
646 extern unsigned long ftrace_update_tot_cnt;
648 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
649 extern int DYN_FTRACE_TEST_NAME(void);
650 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
651 extern int DYN_FTRACE_TEST_NAME2(void);
653 extern bool ring_buffer_expanded;
654 extern bool tracing_selftest_disabled;
655 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
657 #ifdef CONFIG_FTRACE_STARTUP_TEST
658 extern int trace_selftest_startup_function(struct tracer *trace,
659 struct trace_array *tr);
660 extern int trace_selftest_startup_function_graph(struct tracer *trace,
661 struct trace_array *tr);
662 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
663 struct trace_array *tr);
664 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
665 struct trace_array *tr);
666 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
667 struct trace_array *tr);
668 extern int trace_selftest_startup_wakeup(struct tracer *trace,
669 struct trace_array *tr);
670 extern int trace_selftest_startup_nop(struct tracer *trace,
671 struct trace_array *tr);
672 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
673 struct trace_array *tr);
674 extern int trace_selftest_startup_branch(struct tracer *trace,
675 struct trace_array *tr);
677 * Tracer data references selftest functions that only occur
678 * on boot up. These can be __init functions. Thus, when selftests
679 * are enabled, then the tracers need to reference __init functions.
681 #define __tracer_data __refdata
683 /* Tracers are seldom changed. Optimize when selftests are disabled. */
684 #define __tracer_data __read_mostly
685 #endif /* CONFIG_FTRACE_STARTUP_TEST */
687 extern void *head_page(struct trace_array_cpu *data);
688 extern unsigned long long ns2usecs(cycle_t nsec);
690 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
692 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
694 trace_array_vprintk(struct trace_array *tr,
695 unsigned long ip, const char *fmt, va_list args);
696 int trace_array_printk(struct trace_array *tr,
697 unsigned long ip, const char *fmt, ...);
698 int trace_array_printk_buf(struct ring_buffer *buffer,
699 unsigned long ip, const char *fmt, ...);
700 void trace_printk_seq(struct trace_seq *s);
701 enum print_line_t print_trace_line(struct trace_iterator *iter);
703 extern unsigned long trace_flags;
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
716 extern enum print_line_t
717 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
718 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
719 extern enum print_line_t
720 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
721 extern void graph_trace_open(struct trace_iterator *iter);
722 extern void graph_trace_close(struct trace_iterator *iter);
723 extern int __trace_graph_entry(struct trace_array *tr,
724 struct ftrace_graph_ent *trace,
725 unsigned long flags, int pc);
726 extern void __trace_graph_return(struct trace_array *tr,
727 struct ftrace_graph_ret *trace,
728 unsigned long flags, int pc);
731 #ifdef CONFIG_DYNAMIC_FTRACE
732 /* TODO: make this variable */
733 #define FTRACE_GRAPH_MAX_FUNCS 32
734 extern int ftrace_graph_filter_enabled;
735 extern int ftrace_graph_count;
736 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
738 static inline int ftrace_graph_addr(unsigned long addr)
742 if (!ftrace_graph_filter_enabled)
745 for (i = 0; i < ftrace_graph_count; i++) {
746 if (addr == ftrace_graph_funcs[i]) {
748 * If no irqs are to be traced, but a set_graph_function
749 * is set, and called by an interrupt handler, we still
753 trace_recursion_set(TRACE_IRQ_BIT);
755 trace_recursion_clear(TRACE_IRQ_BIT);
763 static inline int ftrace_graph_addr(unsigned long addr)
767 #endif /* CONFIG_DYNAMIC_FTRACE */
768 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
769 static inline enum print_line_t
770 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
772 return TRACE_TYPE_UNHANDLED;
774 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
776 extern struct list_head ftrace_pids;
778 #ifdef CONFIG_FUNCTION_TRACER
779 extern bool ftrace_filter_param __initdata;
780 static inline int ftrace_trace_task(struct task_struct *task)
782 if (list_empty(&ftrace_pids))
785 return test_tsk_trace_trace(task);
787 extern int ftrace_is_dead(void);
789 static inline int ftrace_trace_task(struct task_struct *task)
793 static inline int ftrace_is_dead(void) { return 0; }
796 int ftrace_event_is_function(struct ftrace_event_call *call);
799 * struct trace_parser - servers for reading the user input separated by spaces
800 * @cont: set if the input is not complete - no final space char was found
801 * @buffer: holds the parsed user input
802 * @idx: user input length
805 struct trace_parser {
812 static inline bool trace_parser_loaded(struct trace_parser *parser)
814 return (parser->idx != 0);
817 static inline bool trace_parser_cont(struct trace_parser *parser)
822 static inline void trace_parser_clear(struct trace_parser *parser)
824 parser->cont = false;
828 extern int trace_parser_get_init(struct trace_parser *parser, int size);
829 extern void trace_parser_put(struct trace_parser *parser);
830 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
831 size_t cnt, loff_t *ppos);
834 * trace_iterator_flags is an enumeration that defines bit
835 * positions into trace_flags that controls the output.
837 * NOTE: These bits must match the trace_options array in
840 enum trace_iterator_flags {
841 TRACE_ITER_PRINT_PARENT = 0x01,
842 TRACE_ITER_SYM_OFFSET = 0x02,
843 TRACE_ITER_SYM_ADDR = 0x04,
844 TRACE_ITER_VERBOSE = 0x08,
845 TRACE_ITER_RAW = 0x10,
846 TRACE_ITER_HEX = 0x20,
847 TRACE_ITER_BIN = 0x40,
848 TRACE_ITER_BLOCK = 0x80,
849 TRACE_ITER_STACKTRACE = 0x100,
850 TRACE_ITER_PRINTK = 0x200,
851 TRACE_ITER_PREEMPTONLY = 0x400,
852 TRACE_ITER_BRANCH = 0x800,
853 TRACE_ITER_ANNOTATE = 0x1000,
854 TRACE_ITER_USERSTACKTRACE = 0x2000,
855 TRACE_ITER_SYM_USEROBJ = 0x4000,
856 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
857 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
858 TRACE_ITER_LATENCY_FMT = 0x20000,
859 TRACE_ITER_SLEEP_TIME = 0x40000,
860 TRACE_ITER_GRAPH_TIME = 0x80000,
861 TRACE_ITER_RECORD_CMD = 0x100000,
862 TRACE_ITER_OVERWRITE = 0x200000,
863 TRACE_ITER_STOP_ON_FREE = 0x400000,
864 TRACE_ITER_IRQ_INFO = 0x800000,
865 TRACE_ITER_MARKERS = 0x1000000,
866 TRACE_ITER_FUNCTION = 0x2000000,
870 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
871 * control the output of kernel symbols.
873 #define TRACE_ITER_SYM_MASK \
874 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
876 extern struct tracer nop_trace;
878 #ifdef CONFIG_BRANCH_TRACER
879 extern int enable_branch_tracing(struct trace_array *tr);
880 extern void disable_branch_tracing(void);
881 static inline int trace_branch_enable(struct trace_array *tr)
883 if (trace_flags & TRACE_ITER_BRANCH)
884 return enable_branch_tracing(tr);
887 static inline void trace_branch_disable(void)
889 /* due to races, always disable */
890 disable_branch_tracing();
893 static inline int trace_branch_enable(struct trace_array *tr)
897 static inline void trace_branch_disable(void)
900 #endif /* CONFIG_BRANCH_TRACER */
902 /* set ring buffers to default size if not already done so */
903 int tracing_update_buffers(void);
905 struct ftrace_event_field {
906 struct list_head link;
915 struct event_filter {
916 int n_preds; /* Number assigned */
917 int a_preds; /* allocated */
918 struct filter_pred *preds;
919 struct filter_pred *root;
923 struct event_subsystem {
924 struct list_head list;
926 struct event_filter *filter;
930 struct ftrace_subsystem_dir {
931 struct list_head list;
932 struct event_subsystem *subsystem;
933 struct trace_array *tr;
934 struct dentry *entry;
939 #define FILTER_PRED_INVALID ((unsigned short)-1)
940 #define FILTER_PRED_IS_RIGHT (1 << 15)
941 #define FILTER_PRED_FOLD (1 << 15)
944 * The max preds is the size of unsigned short with
945 * two flags at the MSBs. One bit is used for both the IS_RIGHT
946 * and FOLD flags. The other is reserved.
948 * 2^14 preds is way more than enough.
950 #define MAX_FILTER_PRED 16384
955 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
957 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
967 char pattern[MAX_FILTER_STR_VAL];
970 regex_match_func match;
978 struct ftrace_event_field *field;
982 unsigned short index;
983 unsigned short parent;
985 unsigned short right;
988 extern enum regex_type
989 filter_parse_regex(char *buff, int len, char **search, int *not);
990 extern void print_event_filter(struct ftrace_event_call *call,
991 struct trace_seq *s);
992 extern int apply_event_filter(struct ftrace_event_call *call,
993 char *filter_string);
994 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
995 char *filter_string);
996 extern void print_subsystem_event_filter(struct event_subsystem *system,
997 struct trace_seq *s);
998 extern int filter_assign_type(const char *type);
1000 struct ftrace_event_field *
1001 trace_find_event_field(struct ftrace_event_call *call, char *name);
1004 filter_check_discard(struct ftrace_event_call *call, void *rec,
1005 struct ring_buffer *buffer,
1006 struct ring_buffer_event *event)
1008 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
1009 !filter_match_preds(call->filter, rec)) {
1010 ring_buffer_discard_commit(buffer, event);
1017 extern void trace_event_enable_cmd_record(bool enable);
1018 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1019 extern int event_trace_del_tracer(struct trace_array *tr);
1021 extern struct mutex event_mutex;
1022 extern struct list_head ftrace_events;
1024 extern const char *__start___trace_bprintk_fmt[];
1025 extern const char *__stop___trace_bprintk_fmt[];
1027 extern const char *__start___tracepoint_str[];
1028 extern const char *__stop___tracepoint_str[];
1030 void trace_printk_init_buffers(void);
1031 void trace_printk_start_comm(void);
1032 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1033 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1036 * Normal trace_printk() and friends allocates special buffers
1037 * to do the manipulation, as well as saves the print formats
1038 * into sections to display. But the trace infrastructure wants
1039 * to use these without the added overhead at the price of being
1040 * a bit slower (used mainly for warnings, where we don't care
1041 * about performance). The internal_trace_puts() is for such
1044 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1047 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1048 extern struct ftrace_event_call \
1049 __attribute__((__aligned__(4))) event_##call;
1050 #undef FTRACE_ENTRY_DUP
1051 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1052 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1054 #include "trace_entries.h"
1056 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1057 int perf_ftrace_event_register(struct ftrace_event_call *call,
1058 enum trace_reg type, void *data);
1060 #define perf_ftrace_event_register NULL
1063 #endif /* _LINUX_KERNEL_TRACE_H */