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,
129 #define TRACE_BUF_SIZE 1024
134 * The CPU trace array - it consists of thousands of trace entries
135 * plus some other descriptor data: (for example which task started
138 struct trace_array_cpu {
140 void *buffer_page; /* ring buffer spare */
142 unsigned long entries;
143 unsigned long saved_latency;
144 unsigned long critical_start;
145 unsigned long critical_end;
146 unsigned long critical_sequence;
148 unsigned long policy;
149 unsigned long rt_priority;
150 unsigned long skipped_entries;
151 cycle_t preempt_timestamp;
154 char comm[TASK_COMM_LEN];
159 struct trace_buffer {
160 struct trace_array *tr;
161 struct ring_buffer *buffer;
162 struct trace_array_cpu __percpu *data;
168 * The trace array - an array of per-CPU trace arrays. This is the
169 * highest level data structure that individual tracers deal with.
170 * They have on/off state as well:
173 struct list_head list;
175 struct trace_buffer trace_buffer;
176 #ifdef CONFIG_TRACER_MAX_TRACE
178 * The max_buffer is used to snapshot the trace when a maximum
179 * latency is reached, or when the user initiates a snapshot.
180 * Some tracers will use this to store a maximum trace while
181 * it continues examining live traces.
183 * The buffers for the max_buffer are set up the same as the trace_buffer
184 * When a snapshot is taken, the buffer of the max_buffer is swapped
185 * with the buffer of the trace_buffer and the buffers are reset for
186 * the trace_buffer so the tracing can continue.
188 struct trace_buffer max_buffer;
189 bool allocated_snapshot;
192 #ifdef CONFIG_FTRACE_SYSCALLS
193 int sys_refcount_enter;
194 int sys_refcount_exit;
195 struct ftrace_event_file *enter_syscall_files[NR_syscalls];
196 struct ftrace_event_file *exit_syscall_files[NR_syscalls];
200 struct tracer *current_trace;
202 raw_spinlock_t start_lock;
204 struct dentry *options;
205 struct dentry *percpu_dir;
206 struct dentry *event_dir;
207 struct list_head systems;
208 struct list_head events;
209 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
214 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
217 extern struct list_head ftrace_trace_arrays;
219 extern struct mutex trace_types_lock;
221 extern int trace_array_get(struct trace_array *tr);
222 extern void trace_array_put(struct trace_array *tr);
225 * The global tracer (top) should be the first trace array added,
226 * but we check the flag anyway.
228 static inline struct trace_array *top_trace_array(void)
230 struct trace_array *tr;
232 tr = list_entry(ftrace_trace_arrays.prev,
234 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
238 #define FTRACE_CMP_TYPE(var, type) \
239 __builtin_types_compatible_p(typeof(var), type *)
242 #define IF_ASSIGN(var, entry, etype, id) \
243 if (FTRACE_CMP_TYPE(var, etype)) { \
244 var = (typeof(var))(entry); \
245 WARN_ON(id && (entry)->type != id); \
249 /* Will cause compile errors if type is not found. */
250 extern void __ftrace_bad_type(void);
253 * The trace_assign_type is a verifier that the entry type is
254 * the same as the type being assigned. To add new types simply
255 * add a line with the following format:
257 * IF_ASSIGN(var, ent, type, id);
259 * Where "type" is the trace type that includes the trace_entry
260 * as the "ent" item. And "id" is the trace identifier that is
261 * used in the trace_type enum.
263 * If the type can have more than one id, then use zero.
265 #define trace_assign_type(var, ent) \
267 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
268 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
269 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
270 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
271 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
272 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
273 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
274 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
276 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
278 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
279 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
281 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
283 __ftrace_bad_type(); \
287 * An option specific to a tracer. This is a boolean value.
288 * The bit is the bit index that sets its value on the
289 * flags value in struct tracer_flags.
292 const char *name; /* Will appear on the trace_options file */
293 u32 bit; /* Mask assigned in val field in tracer_flags */
297 * The set of specific options for a tracer. Your tracer
298 * have to set the initial value of the flags val.
300 struct tracer_flags {
302 struct tracer_opt *opts;
305 /* Makes more easy to define a tracer opt */
306 #define TRACER_OPT(s, b) .name = #s, .bit = b
310 * struct tracer - a specific tracer and its callbacks to interact with debugfs
311 * @name: the name chosen to select it on the available_tracers file
312 * @init: called when one switches to this tracer (echo name > current_tracer)
313 * @reset: called when one switches to another tracer
314 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
315 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
316 * @open: called when the trace file is opened
317 * @pipe_open: called when the trace_pipe file is opened
318 * @wait_pipe: override how the user waits for traces on trace_pipe
319 * @close: called when the trace file is released
320 * @pipe_close: called when the trace_pipe file is released
321 * @read: override the default read callback on trace_pipe
322 * @splice_read: override the default splice_read callback on trace_pipe
323 * @selftest: selftest to run on boot (see trace_selftest.c)
324 * @print_headers: override the first lines that describe your columns
325 * @print_line: callback that prints a trace
326 * @set_flag: signals one of your private flags changed (trace_options file)
327 * @flags: your private flags
331 int (*init)(struct trace_array *tr);
332 void (*reset)(struct trace_array *tr);
333 void (*start)(struct trace_array *tr);
334 void (*stop)(struct trace_array *tr);
335 void (*open)(struct trace_iterator *iter);
336 void (*pipe_open)(struct trace_iterator *iter);
337 void (*wait_pipe)(struct trace_iterator *iter);
338 void (*close)(struct trace_iterator *iter);
339 void (*pipe_close)(struct trace_iterator *iter);
340 ssize_t (*read)(struct trace_iterator *iter,
341 struct file *filp, char __user *ubuf,
342 size_t cnt, loff_t *ppos);
343 ssize_t (*splice_read)(struct trace_iterator *iter,
346 struct pipe_inode_info *pipe,
349 #ifdef CONFIG_FTRACE_STARTUP_TEST
350 int (*selftest)(struct tracer *trace,
351 struct trace_array *tr);
353 void (*print_header)(struct seq_file *m);
354 enum print_line_t (*print_line)(struct trace_iterator *iter);
355 /* If you handled the flag setting, return 0 */
356 int (*set_flag)(u32 old_flags, u32 bit, int set);
357 /* Return 0 if OK with change, else return non-zero */
358 int (*flag_changed)(struct tracer *tracer,
361 struct tracer_flags *flags;
364 #ifdef CONFIG_TRACER_MAX_TRACE
370 /* Only current can touch trace_recursion */
373 * For function tracing recursion:
374 * The order of these bits are important.
376 * When function tracing occurs, the following steps are made:
377 * If arch does not support a ftrace feature:
378 * call internal function (uses INTERNAL bits) which calls...
379 * If callback is registered to the "global" list, the list
380 * function is called and recursion checks the GLOBAL bits.
381 * then this function calls...
382 * The function callback, which can use the FTRACE bits to
383 * check for recursion.
385 * Now if the arch does not suppport a feature, and it calls
386 * the global list function which calls the ftrace callback
387 * all three of these steps will do a recursion protection.
388 * There's no reason to do one if the previous caller already
389 * did. The recursion that we are protecting against will
390 * go through the same steps again.
392 * To prevent the multiple recursion checks, if a recursion
393 * bit is set that is higher than the MAX bit of the current
394 * check, then we know that the check was made by the previous
395 * caller, and we can skip the current check.
399 TRACE_BUFFER_NMI_BIT,
400 TRACE_BUFFER_IRQ_BIT,
401 TRACE_BUFFER_SIRQ_BIT,
403 /* Start of function recursion bits */
405 TRACE_FTRACE_NMI_BIT,
406 TRACE_FTRACE_IRQ_BIT,
407 TRACE_FTRACE_SIRQ_BIT,
409 /* GLOBAL_BITs must be greater than FTRACE_BITs */
411 TRACE_GLOBAL_NMI_BIT,
412 TRACE_GLOBAL_IRQ_BIT,
413 TRACE_GLOBAL_SIRQ_BIT,
415 /* INTERNAL_BITs must be greater than GLOBAL_BITs */
417 TRACE_INTERNAL_NMI_BIT,
418 TRACE_INTERNAL_IRQ_BIT,
419 TRACE_INTERNAL_SIRQ_BIT,
424 * Abuse of the trace_recursion.
425 * As we need a way to maintain state if we are tracing the function
426 * graph in irq because we want to trace a particular function that
427 * was called in irq context but we have irq tracing off. Since this
428 * can only be modified by current, we can reuse trace_recursion.
433 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
434 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
435 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
437 #define TRACE_CONTEXT_BITS 4
439 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
440 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
442 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT
443 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
445 #define TRACE_LIST_START TRACE_INTERNAL_BIT
446 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
448 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
450 static __always_inline int trace_get_context_bit(void)
454 if (in_interrupt()) {
468 static __always_inline int trace_test_and_set_recursion(int start, int max)
470 unsigned int val = current->trace_recursion;
473 /* A previous recursion check was made */
474 if ((val & TRACE_CONTEXT_MASK) > max)
477 bit = trace_get_context_bit() + start;
478 if (unlikely(val & (1 << bit)))
482 current->trace_recursion = val;
488 static __always_inline void trace_clear_recursion(int bit)
490 unsigned int val = current->trace_recursion;
499 current->trace_recursion = val;
502 static inline struct ring_buffer_iter *
503 trace_buffer_iter(struct trace_iterator *iter, int cpu)
505 if (iter->buffer_iter && iter->buffer_iter[cpu])
506 return iter->buffer_iter[cpu];
510 int tracer_init(struct tracer *t, struct trace_array *tr);
511 int tracing_is_enabled(void);
512 void tracing_reset(struct trace_buffer *buf, int cpu);
513 void tracing_reset_online_cpus(struct trace_buffer *buf);
514 void tracing_reset_current(int cpu);
515 void tracing_reset_all_online_cpus(void);
516 int tracing_open_generic(struct inode *inode, struct file *filp);
517 bool tracing_is_disabled(void);
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
715 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
716 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
718 extern enum print_line_t
719 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
720 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
721 extern enum print_line_t
722 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
723 extern void graph_trace_open(struct trace_iterator *iter);
724 extern void graph_trace_close(struct trace_iterator *iter);
725 extern int __trace_graph_entry(struct trace_array *tr,
726 struct ftrace_graph_ent *trace,
727 unsigned long flags, int pc);
728 extern void __trace_graph_return(struct trace_array *tr,
729 struct ftrace_graph_ret *trace,
730 unsigned long flags, int pc);
733 #ifdef CONFIG_DYNAMIC_FTRACE
734 /* TODO: make this variable */
735 #define FTRACE_GRAPH_MAX_FUNCS 32
736 extern int ftrace_graph_count;
737 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
738 extern int ftrace_graph_notrace_count;
739 extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS];
741 static inline int ftrace_graph_addr(unsigned long addr)
745 if (!ftrace_graph_count)
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_notrace_addr(unsigned long addr)
770 if (!ftrace_graph_notrace_count)
773 for (i = 0; i < ftrace_graph_notrace_count; i++) {
774 if (addr == ftrace_graph_notrace_funcs[i])
781 static inline int ftrace_graph_addr(unsigned long addr)
786 static inline int ftrace_graph_notrace_addr(unsigned long addr)
790 #endif /* CONFIG_DYNAMIC_FTRACE */
791 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
792 static inline enum print_line_t
793 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
795 return TRACE_TYPE_UNHANDLED;
797 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
799 extern struct list_head ftrace_pids;
801 #ifdef CONFIG_FUNCTION_TRACER
802 extern bool ftrace_filter_param __initdata;
803 static inline int ftrace_trace_task(struct task_struct *task)
805 if (list_empty(&ftrace_pids))
808 return test_tsk_trace_trace(task);
810 extern int ftrace_is_dead(void);
812 static inline int ftrace_trace_task(struct task_struct *task)
816 static inline int ftrace_is_dead(void) { return 0; }
819 int ftrace_event_is_function(struct ftrace_event_call *call);
822 * struct trace_parser - servers for reading the user input separated by spaces
823 * @cont: set if the input is not complete - no final space char was found
824 * @buffer: holds the parsed user input
825 * @idx: user input length
828 struct trace_parser {
835 static inline bool trace_parser_loaded(struct trace_parser *parser)
837 return (parser->idx != 0);
840 static inline bool trace_parser_cont(struct trace_parser *parser)
845 static inline void trace_parser_clear(struct trace_parser *parser)
847 parser->cont = false;
851 extern int trace_parser_get_init(struct trace_parser *parser, int size);
852 extern void trace_parser_put(struct trace_parser *parser);
853 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
854 size_t cnt, loff_t *ppos);
857 * trace_iterator_flags is an enumeration that defines bit
858 * positions into trace_flags that controls the output.
860 * NOTE: These bits must match the trace_options array in
863 enum trace_iterator_flags {
864 TRACE_ITER_PRINT_PARENT = 0x01,
865 TRACE_ITER_SYM_OFFSET = 0x02,
866 TRACE_ITER_SYM_ADDR = 0x04,
867 TRACE_ITER_VERBOSE = 0x08,
868 TRACE_ITER_RAW = 0x10,
869 TRACE_ITER_HEX = 0x20,
870 TRACE_ITER_BIN = 0x40,
871 TRACE_ITER_BLOCK = 0x80,
872 TRACE_ITER_STACKTRACE = 0x100,
873 TRACE_ITER_PRINTK = 0x200,
874 TRACE_ITER_PREEMPTONLY = 0x400,
875 TRACE_ITER_BRANCH = 0x800,
876 TRACE_ITER_ANNOTATE = 0x1000,
877 TRACE_ITER_USERSTACKTRACE = 0x2000,
878 TRACE_ITER_SYM_USEROBJ = 0x4000,
879 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
880 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
881 TRACE_ITER_LATENCY_FMT = 0x20000,
882 TRACE_ITER_SLEEP_TIME = 0x40000,
883 TRACE_ITER_GRAPH_TIME = 0x80000,
884 TRACE_ITER_RECORD_CMD = 0x100000,
885 TRACE_ITER_OVERWRITE = 0x200000,
886 TRACE_ITER_STOP_ON_FREE = 0x400000,
887 TRACE_ITER_IRQ_INFO = 0x800000,
888 TRACE_ITER_MARKERS = 0x1000000,
889 TRACE_ITER_FUNCTION = 0x2000000,
893 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
894 * control the output of kernel symbols.
896 #define TRACE_ITER_SYM_MASK \
897 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
899 extern struct tracer nop_trace;
901 #ifdef CONFIG_BRANCH_TRACER
902 extern int enable_branch_tracing(struct trace_array *tr);
903 extern void disable_branch_tracing(void);
904 static inline int trace_branch_enable(struct trace_array *tr)
906 if (trace_flags & TRACE_ITER_BRANCH)
907 return enable_branch_tracing(tr);
910 static inline void trace_branch_disable(void)
912 /* due to races, always disable */
913 disable_branch_tracing();
916 static inline int trace_branch_enable(struct trace_array *tr)
920 static inline void trace_branch_disable(void)
923 #endif /* CONFIG_BRANCH_TRACER */
925 /* set ring buffers to default size if not already done so */
926 int tracing_update_buffers(void);
928 struct ftrace_event_field {
929 struct list_head link;
938 struct event_filter {
939 int n_preds; /* Number assigned */
940 int a_preds; /* allocated */
941 struct filter_pred *preds;
942 struct filter_pred *root;
946 struct event_subsystem {
947 struct list_head list;
949 struct event_filter *filter;
953 struct ftrace_subsystem_dir {
954 struct list_head list;
955 struct event_subsystem *subsystem;
956 struct trace_array *tr;
957 struct dentry *entry;
962 #define FILTER_PRED_INVALID ((unsigned short)-1)
963 #define FILTER_PRED_IS_RIGHT (1 << 15)
964 #define FILTER_PRED_FOLD (1 << 15)
967 * The max preds is the size of unsigned short with
968 * two flags at the MSBs. One bit is used for both the IS_RIGHT
969 * and FOLD flags. The other is reserved.
971 * 2^14 preds is way more than enough.
973 #define MAX_FILTER_PRED 16384
978 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
980 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
990 char pattern[MAX_FILTER_STR_VAL];
993 regex_match_func match;
1000 unsigned short *ops;
1001 struct ftrace_event_field *field;
1005 unsigned short index;
1006 unsigned short parent;
1007 unsigned short left;
1008 unsigned short right;
1011 extern enum regex_type
1012 filter_parse_regex(char *buff, int len, char **search, int *not);
1013 extern void print_event_filter(struct ftrace_event_file *file,
1014 struct trace_seq *s);
1015 extern int apply_event_filter(struct ftrace_event_file *file,
1016 char *filter_string);
1017 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
1018 char *filter_string);
1019 extern void print_subsystem_event_filter(struct event_subsystem *system,
1020 struct trace_seq *s);
1021 extern int filter_assign_type(const char *type);
1023 struct ftrace_event_field *
1024 trace_find_event_field(struct ftrace_event_call *call, char *name);
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 extern const char *__start___tracepoint_str[];
1037 extern const char *__stop___tracepoint_str[];
1039 void trace_printk_init_buffers(void);
1040 void trace_printk_start_comm(void);
1041 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1042 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1045 * Normal trace_printk() and friends allocates special buffers
1046 * to do the manipulation, as well as saves the print formats
1047 * into sections to display. But the trace infrastructure wants
1048 * to use these without the added overhead at the price of being
1049 * a bit slower (used mainly for warnings, where we don't care
1050 * about performance). The internal_trace_puts() is for such
1053 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1056 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1057 extern struct ftrace_event_call \
1058 __attribute__((__aligned__(4))) event_##call;
1059 #undef FTRACE_ENTRY_DUP
1060 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1061 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1063 #include "trace_entries.h"
1065 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1066 int perf_ftrace_event_register(struct ftrace_event_call *call,
1067 enum trace_reg type, void *data);
1069 #define perf_ftrace_event_register NULL
1072 #endif /* _LINUX_KERNEL_TRACE_H */