1 // SPDX-License-Identifier: GPL-2.0
3 #ifndef _LINUX_KERNEL_TRACE_H
4 #define _LINUX_KERNEL_TRACE_H
7 #include <linux/atomic.h>
8 #include <linux/sched.h>
9 #include <linux/clocksource.h>
10 #include <linux/ring_buffer.h>
11 #include <linux/mmiotrace.h>
12 #include <linux/tracepoint.h>
13 #include <linux/ftrace.h>
14 #include <linux/trace.h>
15 #include <linux/hw_breakpoint.h>
16 #include <linux/trace_seq.h>
17 #include <linux/trace_events.h>
18 #include <linux/compiler.h>
19 #include <linux/glob.h>
20 #include <linux/irq_work.h>
21 #include <linux/workqueue.h>
23 #ifdef CONFIG_FTRACE_SYSCALLS
24 #include <asm/unistd.h> /* For NR_SYSCALLS */
25 #include <asm/syscall.h> /* some archs define it here */
29 __TRACE_FIRST_TYPE = 0,
53 #define __field(type, item) type item;
56 #define __field_fn(type, item) type item;
59 #define __field_struct(type, item) __field(type, item)
62 #define __field_desc(type, container, item)
65 #define __array(type, item, size) type item[size];
68 #define __array_desc(type, container, item, size)
70 #undef __dynamic_array
71 #define __dynamic_array(type, item) type item[];
74 #define F_STRUCT(args...) args
77 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
78 struct struct_name { \
79 struct trace_entry ent; \
83 #undef FTRACE_ENTRY_DUP
84 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
86 #undef FTRACE_ENTRY_REG
87 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
88 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
90 #undef FTRACE_ENTRY_PACKED
91 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \
92 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed
94 #include "trace_entries.h"
97 * syscalls are special, and need special handling, this is why
98 * they are not included in trace_entries.h
100 struct syscall_trace_enter {
101 struct trace_entry ent;
103 unsigned long args[];
106 struct syscall_trace_exit {
107 struct trace_entry ent;
112 struct kprobe_trace_entry_head {
113 struct trace_entry ent;
117 struct kretprobe_trace_entry_head {
118 struct trace_entry ent;
120 unsigned long ret_ip;
124 * trace_flag_type is an enumeration that holds different
125 * states when a trace occurs. These are:
126 * IRQS_OFF - interrupts were disabled
127 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
128 * NEED_RESCHED - reschedule is requested
129 * HARDIRQ - inside an interrupt handler
130 * SOFTIRQ - inside a softirq handler
132 enum trace_flag_type {
133 TRACE_FLAG_IRQS_OFF = 0x01,
134 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
135 TRACE_FLAG_NEED_RESCHED = 0x04,
136 TRACE_FLAG_HARDIRQ = 0x08,
137 TRACE_FLAG_SOFTIRQ = 0x10,
138 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
139 TRACE_FLAG_NMI = 0x40,
142 #define TRACE_BUF_SIZE 1024
147 * The CPU trace array - it consists of thousands of trace entries
148 * plus some other descriptor data: (for example which task started
151 struct trace_array_cpu {
153 void *buffer_page; /* ring buffer spare */
155 unsigned long entries;
156 unsigned long saved_latency;
157 unsigned long critical_start;
158 unsigned long critical_end;
159 unsigned long critical_sequence;
161 unsigned long policy;
162 unsigned long rt_priority;
163 unsigned long skipped_entries;
164 u64 preempt_timestamp;
167 char comm[TASK_COMM_LEN];
170 #ifdef CONFIG_FUNCTION_TRACER
171 bool ftrace_ignore_pid;
176 struct trace_option_dentry;
178 struct trace_buffer {
179 struct trace_array *tr;
180 struct ring_buffer *buffer;
181 struct trace_array_cpu __percpu *data;
186 #define TRACE_FLAGS_MAX_SIZE 32
188 struct trace_options {
189 struct tracer *tracer;
190 struct trace_option_dentry *topts;
193 struct trace_pid_list {
198 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
201 * struct cond_snapshot - conditional snapshot data and callback
203 * The cond_snapshot structure encapsulates a callback function and
204 * data associated with the snapshot for a given tracing instance.
206 * When a snapshot is taken conditionally, by invoking
207 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
208 * passed in turn to the cond_snapshot.update() function. That data
209 * can be compared by the update() implementation with the cond_data
210 * contained wihin the struct cond_snapshot instance associated with
211 * the trace_array. Because the tr->max_lock is held throughout the
212 * update() call, the update() function can directly retrieve the
213 * cond_snapshot and cond_data associated with the per-instance
214 * snapshot associated with the trace_array.
216 * The cond_snapshot.update() implementation can save data to be
217 * associated with the snapshot if it decides to, and returns 'true'
218 * in that case, or it returns 'false' if the conditional snapshot
219 * shouldn't be taken.
221 * The cond_snapshot instance is created and associated with the
222 * user-defined cond_data by tracing_cond_snapshot_enable().
223 * Likewise, the cond_snapshot instance is destroyed and is no longer
224 * associated with the trace instance by
225 * tracing_cond_snapshot_disable().
227 * The method below is required.
229 * @update: When a conditional snapshot is invoked, the update()
230 * callback function is invoked with the tr->max_lock held. The
231 * update() implementation signals whether or not to actually
232 * take the snapshot, by returning 'true' if so, 'false' if no
233 * snapshot should be taken. Because the max_lock is held for
234 * the duration of update(), the implementation is safe to
235 * directly retrieven and save any implementation data it needs
236 * to in association with the snapshot.
238 struct cond_snapshot {
240 cond_update_fn_t update;
244 * The trace array - an array of per-CPU trace arrays. This is the
245 * highest level data structure that individual tracers deal with.
246 * They have on/off state as well:
249 struct list_head list;
251 struct trace_buffer trace_buffer;
252 #ifdef CONFIG_TRACER_MAX_TRACE
254 * The max_buffer is used to snapshot the trace when a maximum
255 * latency is reached, or when the user initiates a snapshot.
256 * Some tracers will use this to store a maximum trace while
257 * it continues examining live traces.
259 * The buffers for the max_buffer are set up the same as the trace_buffer
260 * When a snapshot is taken, the buffer of the max_buffer is swapped
261 * with the buffer of the trace_buffer and the buffers are reset for
262 * the trace_buffer so the tracing can continue.
264 struct trace_buffer max_buffer;
265 bool allocated_snapshot;
267 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
268 unsigned long max_latency;
269 #ifdef CONFIG_FSNOTIFY
270 struct dentry *d_max_latency;
271 struct work_struct fsnotify_work;
272 struct irq_work fsnotify_irqwork;
275 struct trace_pid_list __rcu *filtered_pids;
277 * max_lock is used to protect the swapping of buffers
278 * when taking a max snapshot. The buffers themselves are
279 * protected by per_cpu spinlocks. But the action of the swap
280 * needs its own lock.
282 * This is defined as a arch_spinlock_t in order to help
283 * with performance when lockdep debugging is enabled.
285 * It is also used in other places outside the update_max_tr
286 * so it needs to be defined outside of the
287 * CONFIG_TRACER_MAX_TRACE.
289 arch_spinlock_t max_lock;
291 #ifdef CONFIG_FTRACE_SYSCALLS
292 int sys_refcount_enter;
293 int sys_refcount_exit;
294 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
295 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
302 unsigned int n_err_log_entries;
303 struct tracer *current_trace;
304 unsigned int trace_flags;
305 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
307 raw_spinlock_t start_lock;
308 struct list_head err_log;
310 struct dentry *options;
311 struct dentry *percpu_dir;
312 struct dentry *event_dir;
313 struct trace_options *topts;
314 struct list_head systems;
315 struct list_head events;
316 struct trace_event_file *trace_marker_file;
317 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
319 #ifdef CONFIG_FUNCTION_TRACER
320 struct ftrace_ops *ops;
321 struct trace_pid_list __rcu *function_pids;
322 #ifdef CONFIG_DYNAMIC_FTRACE
323 /* All of these are protected by the ftrace_lock */
324 struct list_head func_probes;
325 struct list_head mod_trace;
326 struct list_head mod_notrace;
328 /* function tracing enabled */
329 int function_enabled;
331 int time_stamp_abs_ref;
332 struct list_head hist_vars;
333 #ifdef CONFIG_TRACER_SNAPSHOT
334 struct cond_snapshot *cond_snapshot;
339 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
342 extern struct list_head ftrace_trace_arrays;
344 extern struct mutex trace_types_lock;
346 extern int trace_array_get(struct trace_array *tr);
347 extern int tracing_check_open_get_tr(struct trace_array *tr);
349 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs);
350 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
352 extern bool trace_clock_in_ns(struct trace_array *tr);
355 * The global tracer (top) should be the first trace array added,
356 * but we check the flag anyway.
358 static inline struct trace_array *top_trace_array(void)
360 struct trace_array *tr;
362 if (list_empty(&ftrace_trace_arrays))
365 tr = list_entry(ftrace_trace_arrays.prev,
367 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
371 #define FTRACE_CMP_TYPE(var, type) \
372 __builtin_types_compatible_p(typeof(var), type *)
375 #define IF_ASSIGN(var, entry, etype, id) \
376 if (FTRACE_CMP_TYPE(var, etype)) { \
377 var = (typeof(var))(entry); \
378 WARN_ON(id != 0 && (entry)->type != id); \
382 /* Will cause compile errors if type is not found. */
383 extern void __ftrace_bad_type(void);
386 * The trace_assign_type is a verifier that the entry type is
387 * the same as the type being assigned. To add new types simply
388 * add a line with the following format:
390 * IF_ASSIGN(var, ent, type, id);
392 * Where "type" is the trace type that includes the trace_entry
393 * as the "ent" item. And "id" is the trace identifier that is
394 * used in the trace_type enum.
396 * If the type can have more than one id, then use zero.
398 #define trace_assign_type(var, ent) \
400 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
401 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
402 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
403 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
404 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
405 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
406 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
407 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
408 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
409 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
411 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
413 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
414 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
416 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
418 __ftrace_bad_type(); \
422 * An option specific to a tracer. This is a boolean value.
423 * The bit is the bit index that sets its value on the
424 * flags value in struct tracer_flags.
427 const char *name; /* Will appear on the trace_options file */
428 u32 bit; /* Mask assigned in val field in tracer_flags */
432 * The set of specific options for a tracer. Your tracer
433 * have to set the initial value of the flags val.
435 struct tracer_flags {
437 struct tracer_opt *opts;
438 struct tracer *trace;
441 /* Makes more easy to define a tracer opt */
442 #define TRACER_OPT(s, b) .name = #s, .bit = b
445 struct trace_option_dentry {
446 struct tracer_opt *opt;
447 struct tracer_flags *flags;
448 struct trace_array *tr;
449 struct dentry *entry;
453 * struct tracer - a specific tracer and its callbacks to interact with tracefs
454 * @name: the name chosen to select it on the available_tracers file
455 * @init: called when one switches to this tracer (echo name > current_tracer)
456 * @reset: called when one switches to another tracer
457 * @start: called when tracing is unpaused (echo 1 > tracing_on)
458 * @stop: called when tracing is paused (echo 0 > tracing_on)
459 * @update_thresh: called when tracing_thresh is updated
460 * @open: called when the trace file is opened
461 * @pipe_open: called when the trace_pipe file is opened
462 * @close: called when the trace file is released
463 * @pipe_close: called when the trace_pipe file is released
464 * @read: override the default read callback on trace_pipe
465 * @splice_read: override the default splice_read callback on trace_pipe
466 * @selftest: selftest to run on boot (see trace_selftest.c)
467 * @print_headers: override the first lines that describe your columns
468 * @print_line: callback that prints a trace
469 * @set_flag: signals one of your private flags changed (trace_options file)
470 * @flags: your private flags
474 int (*init)(struct trace_array *tr);
475 void (*reset)(struct trace_array *tr);
476 void (*start)(struct trace_array *tr);
477 void (*stop)(struct trace_array *tr);
478 int (*update_thresh)(struct trace_array *tr);
479 void (*open)(struct trace_iterator *iter);
480 void (*pipe_open)(struct trace_iterator *iter);
481 void (*close)(struct trace_iterator *iter);
482 void (*pipe_close)(struct trace_iterator *iter);
483 ssize_t (*read)(struct trace_iterator *iter,
484 struct file *filp, char __user *ubuf,
485 size_t cnt, loff_t *ppos);
486 ssize_t (*splice_read)(struct trace_iterator *iter,
489 struct pipe_inode_info *pipe,
492 #ifdef CONFIG_FTRACE_STARTUP_TEST
493 int (*selftest)(struct tracer *trace,
494 struct trace_array *tr);
496 void (*print_header)(struct seq_file *m);
497 enum print_line_t (*print_line)(struct trace_iterator *iter);
498 /* If you handled the flag setting, return 0 */
499 int (*set_flag)(struct trace_array *tr,
500 u32 old_flags, u32 bit, int set);
501 /* Return 0 if OK with change, else return non-zero */
502 int (*flag_changed)(struct trace_array *tr,
505 struct tracer_flags *flags;
509 bool allow_instances;
510 #ifdef CONFIG_TRACER_MAX_TRACE
513 /* True if tracer cannot be enabled in kernel param */
518 /* Only current can touch trace_recursion */
521 * For function tracing recursion:
522 * The order of these bits are important.
524 * When function tracing occurs, the following steps are made:
525 * If arch does not support a ftrace feature:
526 * call internal function (uses INTERNAL bits) which calls...
527 * If callback is registered to the "global" list, the list
528 * function is called and recursion checks the GLOBAL bits.
529 * then this function calls...
530 * The function callback, which can use the FTRACE bits to
531 * check for recursion.
533 * Now if the arch does not suppport a feature, and it calls
534 * the global list function which calls the ftrace callback
535 * all three of these steps will do a recursion protection.
536 * There's no reason to do one if the previous caller already
537 * did. The recursion that we are protecting against will
538 * go through the same steps again.
540 * To prevent the multiple recursion checks, if a recursion
541 * bit is set that is higher than the MAX bit of the current
542 * check, then we know that the check was made by the previous
543 * caller, and we can skip the current check.
547 TRACE_BUFFER_NMI_BIT,
548 TRACE_BUFFER_IRQ_BIT,
549 TRACE_BUFFER_SIRQ_BIT,
551 /* Start of function recursion bits */
553 TRACE_FTRACE_NMI_BIT,
554 TRACE_FTRACE_IRQ_BIT,
555 TRACE_FTRACE_SIRQ_BIT,
557 /* INTERNAL_BITs must be greater than FTRACE_BITs */
559 TRACE_INTERNAL_NMI_BIT,
560 TRACE_INTERNAL_IRQ_BIT,
561 TRACE_INTERNAL_SIRQ_BIT,
565 * Abuse of the trace_recursion.
566 * As we need a way to maintain state if we are tracing the function
567 * graph in irq because we want to trace a particular function that
568 * was called in irq context but we have irq tracing off. Since this
569 * can only be modified by current, we can reuse trace_recursion.
573 /* Set if the function is in the set_graph_function file */
577 * In the very unlikely case that an interrupt came in
578 * at a start of graph tracing, and we want to trace
579 * the function in that interrupt, the depth can be greater
580 * than zero, because of the preempted start of a previous
581 * trace. In an even more unlikely case, depth could be 2
582 * if a softirq interrupted the start of graph tracing,
583 * followed by an interrupt preempting a start of graph
584 * tracing in the softirq, and depth can even be 3
585 * if an NMI came in at the start of an interrupt function
586 * that preempted a softirq start of a function that
587 * preempted normal context!!!! Luckily, it can't be
588 * greater than 3, so the next two bits are a mask
589 * of what the depth is when we set TRACE_GRAPH_BIT
592 TRACE_GRAPH_DEPTH_START_BIT,
593 TRACE_GRAPH_DEPTH_END_BIT,
596 * To implement set_graph_notrace, if this bit is set, we ignore
597 * function graph tracing of called functions, until the return
598 * function is called to clear it.
600 TRACE_GRAPH_NOTRACE_BIT,
603 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
604 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
605 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
607 #define trace_recursion_depth() \
608 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3)
609 #define trace_recursion_set_depth(depth) \
611 current->trace_recursion &= \
612 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \
613 current->trace_recursion |= \
614 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \
617 #define TRACE_CONTEXT_BITS 4
619 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
620 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
622 #define TRACE_LIST_START TRACE_INTERNAL_BIT
623 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
625 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
627 static __always_inline int trace_get_context_bit(void)
631 if (in_interrupt()) {
645 static __always_inline int trace_test_and_set_recursion(int start, int max)
647 unsigned int val = current->trace_recursion;
650 /* A previous recursion check was made */
651 if ((val & TRACE_CONTEXT_MASK) > max)
654 bit = trace_get_context_bit() + start;
655 if (unlikely(val & (1 << bit)))
659 current->trace_recursion = val;
665 static __always_inline void trace_clear_recursion(int bit)
667 unsigned int val = current->trace_recursion;
676 current->trace_recursion = val;
679 static inline struct ring_buffer_iter *
680 trace_buffer_iter(struct trace_iterator *iter, int cpu)
682 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
685 int tracer_init(struct tracer *t, struct trace_array *tr);
686 int tracing_is_enabled(void);
687 void tracing_reset_online_cpus(struct trace_buffer *buf);
688 void tracing_reset_current(int cpu);
689 void tracing_reset_all_online_cpus(void);
690 int tracing_open_generic(struct inode *inode, struct file *filp);
691 int tracing_open_generic_tr(struct inode *inode, struct file *filp);
692 bool tracing_is_disabled(void);
693 bool tracer_tracing_is_on(struct trace_array *tr);
694 void tracer_tracing_on(struct trace_array *tr);
695 void tracer_tracing_off(struct trace_array *tr);
696 struct dentry *trace_create_file(const char *name,
698 struct dentry *parent,
700 const struct file_operations *fops);
702 struct dentry *tracing_init_dentry(void);
704 struct ring_buffer_event;
706 struct ring_buffer_event *
707 trace_buffer_lock_reserve(struct ring_buffer *buffer,
713 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
714 struct trace_array_cpu *data);
716 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
717 int *ent_cpu, u64 *ent_ts);
719 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer,
720 struct ring_buffer_event *event);
722 int trace_empty(struct trace_iterator *iter);
724 void *trace_find_next_entry_inc(struct trace_iterator *iter);
726 void trace_init_global_iter(struct trace_iterator *iter);
728 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
730 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
731 unsigned long trace_total_entries(struct trace_array *tr);
733 void trace_function(struct trace_array *tr,
735 unsigned long parent_ip,
736 unsigned long flags, int pc);
737 void trace_graph_function(struct trace_array *tr,
739 unsigned long parent_ip,
740 unsigned long flags, int pc);
741 void trace_latency_header(struct seq_file *m);
742 void trace_default_header(struct seq_file *m);
743 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
744 int trace_empty(struct trace_iterator *iter);
746 void trace_graph_return(struct ftrace_graph_ret *trace);
747 int trace_graph_entry(struct ftrace_graph_ent *trace);
748 void set_graph_array(struct trace_array *tr);
750 void tracing_start_cmdline_record(void);
751 void tracing_stop_cmdline_record(void);
752 void tracing_start_tgid_record(void);
753 void tracing_stop_tgid_record(void);
755 int register_tracer(struct tracer *type);
756 int is_tracing_stopped(void);
758 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
760 extern cpumask_var_t __read_mostly tracing_buffer_mask;
762 #define for_each_tracing_cpu(cpu) \
763 for_each_cpu(cpu, tracing_buffer_mask)
765 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
767 extern unsigned long tracing_thresh;
773 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
775 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
776 struct task_struct *task);
777 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
778 struct task_struct *self,
779 struct task_struct *task);
780 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
781 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
782 int trace_pid_show(struct seq_file *m, void *v);
783 void trace_free_pid_list(struct trace_pid_list *pid_list);
784 int trace_pid_write(struct trace_pid_list *filtered_pids,
785 struct trace_pid_list **new_pid_list,
786 const char __user *ubuf, size_t cnt);
788 #ifdef CONFIG_TRACER_MAX_TRACE
789 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
791 void update_max_tr_single(struct trace_array *tr,
792 struct task_struct *tsk, int cpu);
793 #endif /* CONFIG_TRACER_MAX_TRACE */
795 #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \
796 defined(CONFIG_FSNOTIFY)
798 void latency_fsnotify(struct trace_array *tr);
802 static inline void latency_fsnotify(struct trace_array *tr) { }
806 #ifdef CONFIG_STACKTRACE
807 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
810 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
814 #endif /* CONFIG_STACKTRACE */
816 extern u64 ftrace_now(int cpu);
818 extern void trace_find_cmdline(int pid, char comm[]);
819 extern int trace_find_tgid(int pid);
820 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
822 #ifdef CONFIG_DYNAMIC_FTRACE
823 extern unsigned long ftrace_update_tot_cnt;
824 extern unsigned long ftrace_number_of_pages;
825 extern unsigned long ftrace_number_of_groups;
826 void ftrace_init_trace_array(struct trace_array *tr);
828 static inline void ftrace_init_trace_array(struct trace_array *tr) { }
830 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
831 extern int DYN_FTRACE_TEST_NAME(void);
832 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
833 extern int DYN_FTRACE_TEST_NAME2(void);
835 extern bool ring_buffer_expanded;
836 extern bool tracing_selftest_disabled;
838 #ifdef CONFIG_FTRACE_STARTUP_TEST
839 extern int trace_selftest_startup_function(struct tracer *trace,
840 struct trace_array *tr);
841 extern int trace_selftest_startup_function_graph(struct tracer *trace,
842 struct trace_array *tr);
843 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
844 struct trace_array *tr);
845 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
846 struct trace_array *tr);
847 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
848 struct trace_array *tr);
849 extern int trace_selftest_startup_wakeup(struct tracer *trace,
850 struct trace_array *tr);
851 extern int trace_selftest_startup_nop(struct tracer *trace,
852 struct trace_array *tr);
853 extern int trace_selftest_startup_branch(struct tracer *trace,
854 struct trace_array *tr);
856 * Tracer data references selftest functions that only occur
857 * on boot up. These can be __init functions. Thus, when selftests
858 * are enabled, then the tracers need to reference __init functions.
860 #define __tracer_data __refdata
862 /* Tracers are seldom changed. Optimize when selftests are disabled. */
863 #define __tracer_data __read_mostly
864 #endif /* CONFIG_FTRACE_STARTUP_TEST */
866 extern void *head_page(struct trace_array_cpu *data);
867 extern unsigned long long ns2usecs(u64 nsec);
869 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
871 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
873 trace_array_vprintk(struct trace_array *tr,
874 unsigned long ip, const char *fmt, va_list args);
875 int trace_array_printk_buf(struct ring_buffer *buffer,
876 unsigned long ip, const char *fmt, ...);
877 void trace_printk_seq(struct trace_seq *s);
878 enum print_line_t print_trace_line(struct trace_iterator *iter);
880 extern char trace_find_mark(unsigned long long duration);
884 struct ftrace_mod_load {
885 struct list_head list;
892 FTRACE_HASH_FL_MOD = (1 << 0),
896 unsigned long size_bits;
897 struct hlist_head *buckets;
903 struct ftrace_func_entry *
904 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
906 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
908 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
911 /* Standard output formatting function used for function return traces */
912 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
915 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
916 #define TRACE_GRAPH_PRINT_CPU 0x2
917 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
918 #define TRACE_GRAPH_PRINT_PROC 0x8
919 #define TRACE_GRAPH_PRINT_DURATION 0x10
920 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
921 #define TRACE_GRAPH_PRINT_REL_TIME 0x40
922 #define TRACE_GRAPH_PRINT_IRQS 0x80
923 #define TRACE_GRAPH_PRINT_TAIL 0x100
924 #define TRACE_GRAPH_SLEEP_TIME 0x200
925 #define TRACE_GRAPH_GRAPH_TIME 0x400
926 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
927 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
929 extern void ftrace_graph_sleep_time_control(bool enable);
931 #ifdef CONFIG_FUNCTION_PROFILER
932 extern void ftrace_graph_graph_time_control(bool enable);
934 static inline void ftrace_graph_graph_time_control(bool enable) { }
937 extern enum print_line_t
938 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
939 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
941 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
942 extern void graph_trace_open(struct trace_iterator *iter);
943 extern void graph_trace_close(struct trace_iterator *iter);
944 extern int __trace_graph_entry(struct trace_array *tr,
945 struct ftrace_graph_ent *trace,
946 unsigned long flags, int pc);
947 extern void __trace_graph_return(struct trace_array *tr,
948 struct ftrace_graph_ret *trace,
949 unsigned long flags, int pc);
951 #ifdef CONFIG_DYNAMIC_FTRACE
952 extern struct ftrace_hash *ftrace_graph_hash;
953 extern struct ftrace_hash *ftrace_graph_notrace_hash;
955 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
957 unsigned long addr = trace->func;
960 preempt_disable_notrace();
962 if (ftrace_hash_empty(ftrace_graph_hash)) {
967 if (ftrace_lookup_ip(ftrace_graph_hash, addr)) {
970 * This needs to be cleared on the return functions
971 * when the depth is zero.
973 trace_recursion_set(TRACE_GRAPH_BIT);
974 trace_recursion_set_depth(trace->depth);
977 * If no irqs are to be traced, but a set_graph_function
978 * is set, and called by an interrupt handler, we still
982 trace_recursion_set(TRACE_IRQ_BIT);
984 trace_recursion_clear(TRACE_IRQ_BIT);
989 preempt_enable_notrace();
993 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
995 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
996 trace->depth == trace_recursion_depth())
997 trace_recursion_clear(TRACE_GRAPH_BIT);
1000 static inline int ftrace_graph_notrace_addr(unsigned long addr)
1004 preempt_disable_notrace();
1006 if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr))
1009 preempt_enable_notrace();
1013 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
1018 static inline int ftrace_graph_notrace_addr(unsigned long addr)
1022 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
1024 #endif /* CONFIG_DYNAMIC_FTRACE */
1026 extern unsigned int fgraph_max_depth;
1028 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
1030 /* trace it when it is-nested-in or is a function enabled. */
1031 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
1032 ftrace_graph_addr(trace)) ||
1033 (trace->depth < 0) ||
1034 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
1037 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
1038 static inline enum print_line_t
1039 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
1041 return TRACE_TYPE_UNHANDLED;
1043 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
1045 extern struct list_head ftrace_pids;
1047 #ifdef CONFIG_FUNCTION_TRACER
1048 struct ftrace_func_command {
1049 struct list_head list;
1051 int (*func)(struct trace_array *tr,
1052 struct ftrace_hash *hash,
1053 char *func, char *cmd,
1054 char *params, int enable);
1056 extern bool ftrace_filter_param __initdata;
1057 static inline int ftrace_trace_task(struct trace_array *tr)
1059 return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid);
1061 extern int ftrace_is_dead(void);
1062 int ftrace_create_function_files(struct trace_array *tr,
1063 struct dentry *parent);
1064 void ftrace_destroy_function_files(struct trace_array *tr);
1065 void ftrace_init_global_array_ops(struct trace_array *tr);
1066 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
1067 void ftrace_reset_array_ops(struct trace_array *tr);
1068 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
1069 void ftrace_init_tracefs_toplevel(struct trace_array *tr,
1070 struct dentry *d_tracer);
1071 void ftrace_clear_pids(struct trace_array *tr);
1072 int init_function_trace(void);
1073 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
1075 static inline int ftrace_trace_task(struct trace_array *tr)
1079 static inline int ftrace_is_dead(void) { return 0; }
1081 ftrace_create_function_files(struct trace_array *tr,
1082 struct dentry *parent)
1086 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1087 static inline __init void
1088 ftrace_init_global_array_ops(struct trace_array *tr) { }
1089 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1090 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
1091 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
1092 static inline void ftrace_clear_pids(struct trace_array *tr) { }
1093 static inline int init_function_trace(void) { return 0; }
1094 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1095 /* ftace_func_t type is not defined, use macro instead of static inline */
1096 #define ftrace_init_array_ops(tr, func) do { } while (0)
1097 #endif /* CONFIG_FUNCTION_TRACER */
1099 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1101 struct ftrace_probe_ops {
1102 void (*func)(unsigned long ip,
1103 unsigned long parent_ip,
1104 struct trace_array *tr,
1105 struct ftrace_probe_ops *ops,
1107 int (*init)(struct ftrace_probe_ops *ops,
1108 struct trace_array *tr,
1109 unsigned long ip, void *init_data,
1111 void (*free)(struct ftrace_probe_ops *ops,
1112 struct trace_array *tr,
1113 unsigned long ip, void *data);
1114 int (*print)(struct seq_file *m,
1116 struct ftrace_probe_ops *ops,
1120 struct ftrace_func_mapper;
1121 typedef int (*ftrace_mapper_func)(void *data);
1123 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1124 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1126 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1127 unsigned long ip, void *data);
1128 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1130 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1131 ftrace_mapper_func free_func);
1134 register_ftrace_function_probe(char *glob, struct trace_array *tr,
1135 struct ftrace_probe_ops *ops, void *data);
1137 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1138 struct ftrace_probe_ops *ops);
1139 extern void clear_ftrace_function_probes(struct trace_array *tr);
1141 int register_ftrace_command(struct ftrace_func_command *cmd);
1142 int unregister_ftrace_command(struct ftrace_func_command *cmd);
1144 void ftrace_create_filter_files(struct ftrace_ops *ops,
1145 struct dentry *parent);
1146 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1148 struct ftrace_func_command;
1150 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1154 static inline __init int unregister_ftrace_command(char *cmd_name)
1158 static inline void clear_ftrace_function_probes(struct trace_array *tr)
1163 * The ops parameter passed in is usually undefined.
1164 * This must be a macro.
1166 #define ftrace_create_filter_files(ops, parent) do { } while (0)
1167 #define ftrace_destroy_filter_files(ops) do { } while (0)
1168 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1170 bool ftrace_event_is_function(struct trace_event_call *call);
1173 * struct trace_parser - servers for reading the user input separated by spaces
1174 * @cont: set if the input is not complete - no final space char was found
1175 * @buffer: holds the parsed user input
1176 * @idx: user input length
1177 * @size: buffer size
1179 struct trace_parser {
1186 static inline bool trace_parser_loaded(struct trace_parser *parser)
1188 return (parser->idx != 0);
1191 static inline bool trace_parser_cont(struct trace_parser *parser)
1193 return parser->cont;
1196 static inline void trace_parser_clear(struct trace_parser *parser)
1198 parser->cont = false;
1202 extern int trace_parser_get_init(struct trace_parser *parser, int size);
1203 extern void trace_parser_put(struct trace_parser *parser);
1204 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1205 size_t cnt, loff_t *ppos);
1208 * Only create function graph options if function graph is configured.
1210 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1211 # define FGRAPH_FLAGS \
1212 C(DISPLAY_GRAPH, "display-graph"),
1214 # define FGRAPH_FLAGS
1217 #ifdef CONFIG_BRANCH_TRACER
1218 # define BRANCH_FLAGS \
1219 C(BRANCH, "branch"),
1221 # define BRANCH_FLAGS
1224 #ifdef CONFIG_FUNCTION_TRACER
1225 # define FUNCTION_FLAGS \
1226 C(FUNCTION, "function-trace"), \
1227 C(FUNC_FORK, "function-fork"),
1228 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1230 # define FUNCTION_FLAGS
1231 # define FUNCTION_DEFAULT_FLAGS 0UL
1232 # define TRACE_ITER_FUNC_FORK 0UL
1235 #ifdef CONFIG_STACKTRACE
1236 # define STACK_FLAGS \
1237 C(STACKTRACE, "stacktrace"),
1239 # define STACK_FLAGS
1243 * trace_iterator_flags is an enumeration that defines bit
1244 * positions into trace_flags that controls the output.
1246 * NOTE: These bits must match the trace_options array in
1247 * trace.c (this macro guarantees it).
1249 #define TRACE_FLAGS \
1250 C(PRINT_PARENT, "print-parent"), \
1251 C(SYM_OFFSET, "sym-offset"), \
1252 C(SYM_ADDR, "sym-addr"), \
1253 C(VERBOSE, "verbose"), \
1257 C(BLOCK, "block"), \
1258 C(PRINTK, "trace_printk"), \
1259 C(ANNOTATE, "annotate"), \
1260 C(USERSTACKTRACE, "userstacktrace"), \
1261 C(SYM_USEROBJ, "sym-userobj"), \
1262 C(PRINTK_MSGONLY, "printk-msg-only"), \
1263 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1264 C(LATENCY_FMT, "latency-format"), \
1265 C(RECORD_CMD, "record-cmd"), \
1266 C(RECORD_TGID, "record-tgid"), \
1267 C(OVERWRITE, "overwrite"), \
1268 C(STOP_ON_FREE, "disable_on_free"), \
1269 C(IRQ_INFO, "irq-info"), \
1270 C(MARKERS, "markers"), \
1271 C(EVENT_FORK, "event-fork"), \
1278 * By defining C, we can make TRACE_FLAGS a list of bit names
1279 * that will define the bits for the flag masks.
1282 #define C(a, b) TRACE_ITER_##a##_BIT
1284 enum trace_iterator_bits {
1286 /* Make sure we don't go more than we have bits for */
1291 * By redefining C, we can make TRACE_FLAGS a list of masks that
1292 * use the bits as defined above.
1295 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1297 enum trace_iterator_flags { TRACE_FLAGS };
1300 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1301 * control the output of kernel symbols.
1303 #define TRACE_ITER_SYM_MASK \
1304 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1306 extern struct tracer nop_trace;
1308 #ifdef CONFIG_BRANCH_TRACER
1309 extern int enable_branch_tracing(struct trace_array *tr);
1310 extern void disable_branch_tracing(void);
1311 static inline int trace_branch_enable(struct trace_array *tr)
1313 if (tr->trace_flags & TRACE_ITER_BRANCH)
1314 return enable_branch_tracing(tr);
1317 static inline void trace_branch_disable(void)
1319 /* due to races, always disable */
1320 disable_branch_tracing();
1323 static inline int trace_branch_enable(struct trace_array *tr)
1327 static inline void trace_branch_disable(void)
1330 #endif /* CONFIG_BRANCH_TRACER */
1332 /* set ring buffers to default size if not already done so */
1333 int tracing_update_buffers(void);
1335 struct ftrace_event_field {
1336 struct list_head link;
1347 struct event_filter {
1348 struct prog_entry __rcu *prog;
1349 char *filter_string;
1352 struct event_subsystem {
1353 struct list_head list;
1355 struct event_filter *filter;
1359 struct trace_subsystem_dir {
1360 struct list_head list;
1361 struct event_subsystem *subsystem;
1362 struct trace_array *tr;
1363 struct dentry *entry;
1368 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1369 struct ring_buffer *buffer,
1370 struct ring_buffer_event *event);
1372 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1373 struct ring_buffer *buffer,
1374 struct ring_buffer_event *event,
1375 unsigned long flags, int pc,
1376 struct pt_regs *regs);
1378 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1379 struct ring_buffer *buffer,
1380 struct ring_buffer_event *event,
1381 unsigned long flags, int pc)
1383 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
1386 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1387 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1388 void trace_buffered_event_disable(void);
1389 void trace_buffered_event_enable(void);
1392 __trace_event_discard_commit(struct ring_buffer *buffer,
1393 struct ring_buffer_event *event)
1395 if (this_cpu_read(trace_buffered_event) == event) {
1396 /* Simply release the temp buffer */
1397 this_cpu_dec(trace_buffered_event_cnt);
1400 ring_buffer_discard_commit(buffer, event);
1404 * Helper function for event_trigger_unlock_commit{_regs}().
1405 * If there are event triggers attached to this event that requires
1406 * filtering against its fields, then they wil be called as the
1407 * entry already holds the field information of the current event.
1409 * It also checks if the event should be discarded or not.
1410 * It is to be discarded if the event is soft disabled and the
1411 * event was only recorded to process triggers, or if the event
1412 * filter is active and this event did not match the filters.
1414 * Returns true if the event is discarded, false otherwise.
1417 __event_trigger_test_discard(struct trace_event_file *file,
1418 struct ring_buffer *buffer,
1419 struct ring_buffer_event *event,
1421 enum event_trigger_type *tt)
1423 unsigned long eflags = file->flags;
1425 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1426 *tt = event_triggers_call(file, entry, event);
1428 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1429 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1430 !filter_match_preds(file->filter, entry))) {
1431 __trace_event_discard_commit(buffer, event);
1439 * event_trigger_unlock_commit - handle triggers and finish event commit
1440 * @file: The file pointer assoctiated to the event
1441 * @buffer: The ring buffer that the event is being written to
1442 * @event: The event meta data in the ring buffer
1443 * @entry: The event itself
1444 * @irq_flags: The state of the interrupts at the start of the event
1445 * @pc: The state of the preempt count at the start of the event.
1447 * This is a helper function to handle triggers that require data
1448 * from the event itself. It also tests the event against filters and
1449 * if the event is soft disabled and should be discarded.
1452 event_trigger_unlock_commit(struct trace_event_file *file,
1453 struct ring_buffer *buffer,
1454 struct ring_buffer_event *event,
1455 void *entry, unsigned long irq_flags, int pc)
1457 enum event_trigger_type tt = ETT_NONE;
1459 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1460 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
1463 event_triggers_post_call(file, tt);
1467 * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1468 * @file: The file pointer assoctiated to the event
1469 * @buffer: The ring buffer that the event is being written to
1470 * @event: The event meta data in the ring buffer
1471 * @entry: The event itself
1472 * @irq_flags: The state of the interrupts at the start of the event
1473 * @pc: The state of the preempt count at the start of the event.
1475 * This is a helper function to handle triggers that require data
1476 * from the event itself. It also tests the event against filters and
1477 * if the event is soft disabled and should be discarded.
1479 * Same as event_trigger_unlock_commit() but calls
1480 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1483 event_trigger_unlock_commit_regs(struct trace_event_file *file,
1484 struct ring_buffer *buffer,
1485 struct ring_buffer_event *event,
1486 void *entry, unsigned long irq_flags, int pc,
1487 struct pt_regs *regs)
1489 enum event_trigger_type tt = ETT_NONE;
1491 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1492 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1493 irq_flags, pc, regs);
1496 event_triggers_post_call(file, tt);
1499 #define FILTER_PRED_INVALID ((unsigned short)-1)
1500 #define FILTER_PRED_IS_RIGHT (1 << 15)
1501 #define FILTER_PRED_FOLD (1 << 15)
1504 * The max preds is the size of unsigned short with
1505 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1506 * and FOLD flags. The other is reserved.
1508 * 2^14 preds is way more than enough.
1510 #define MAX_FILTER_PRED 16384
1515 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1517 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1529 char pattern[MAX_FILTER_STR_VAL];
1532 regex_match_func match;
1535 struct filter_pred {
1536 filter_pred_fn_t fn;
1539 unsigned short *ops;
1540 struct ftrace_event_field *field;
1546 static inline bool is_string_field(struct ftrace_event_field *field)
1548 return field->filter_type == FILTER_DYN_STRING ||
1549 field->filter_type == FILTER_STATIC_STRING ||
1550 field->filter_type == FILTER_PTR_STRING ||
1551 field->filter_type == FILTER_COMM;
1554 static inline bool is_function_field(struct ftrace_event_field *field)
1556 return field->filter_type == FILTER_TRACE_FN;
1559 extern enum regex_type
1560 filter_parse_regex(char *buff, int len, char **search, int *not);
1561 extern void print_event_filter(struct trace_event_file *file,
1562 struct trace_seq *s);
1563 extern int apply_event_filter(struct trace_event_file *file,
1564 char *filter_string);
1565 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1566 char *filter_string);
1567 extern void print_subsystem_event_filter(struct event_subsystem *system,
1568 struct trace_seq *s);
1569 extern int filter_assign_type(const char *type);
1570 extern int create_event_filter(struct trace_array *tr,
1571 struct trace_event_call *call,
1572 char *filter_str, bool set_str,
1573 struct event_filter **filterp);
1574 extern void free_event_filter(struct event_filter *filter);
1576 struct ftrace_event_field *
1577 trace_find_event_field(struct trace_event_call *call, char *name);
1579 extern void trace_event_enable_cmd_record(bool enable);
1580 extern void trace_event_enable_tgid_record(bool enable);
1582 extern int event_trace_init(void);
1583 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1584 extern int event_trace_del_tracer(struct trace_array *tr);
1586 extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1589 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1593 static inline void *event_file_data(struct file *filp)
1595 return READ_ONCE(file_inode(filp)->i_private);
1598 extern struct mutex event_mutex;
1599 extern struct list_head ftrace_events;
1601 extern const struct file_operations event_trigger_fops;
1602 extern const struct file_operations event_hist_fops;
1603 extern const struct file_operations event_inject_fops;
1605 #ifdef CONFIG_HIST_TRIGGERS
1606 extern int register_trigger_hist_cmd(void);
1607 extern int register_trigger_hist_enable_disable_cmds(void);
1609 static inline int register_trigger_hist_cmd(void) { return 0; }
1610 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1613 extern int register_trigger_cmds(void);
1614 extern void clear_event_triggers(struct trace_array *tr);
1616 struct event_trigger_data {
1617 unsigned long count;
1619 struct event_trigger_ops *ops;
1620 struct event_command *cmd_ops;
1621 struct event_filter __rcu *filter;
1626 struct list_head list;
1628 struct list_head named_list;
1629 struct event_trigger_data *named_data;
1633 #define ENABLE_EVENT_STR "enable_event"
1634 #define DISABLE_EVENT_STR "disable_event"
1635 #define ENABLE_HIST_STR "enable_hist"
1636 #define DISABLE_HIST_STR "disable_hist"
1638 struct enable_trigger_data {
1639 struct trace_event_file *file;
1644 extern int event_enable_trigger_print(struct seq_file *m,
1645 struct event_trigger_ops *ops,
1646 struct event_trigger_data *data);
1647 extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1648 struct event_trigger_data *data);
1649 extern int event_enable_trigger_func(struct event_command *cmd_ops,
1650 struct trace_event_file *file,
1651 char *glob, char *cmd, char *param);
1652 extern int event_enable_register_trigger(char *glob,
1653 struct event_trigger_ops *ops,
1654 struct event_trigger_data *data,
1655 struct trace_event_file *file);
1656 extern void event_enable_unregister_trigger(char *glob,
1657 struct event_trigger_ops *ops,
1658 struct event_trigger_data *test,
1659 struct trace_event_file *file);
1660 extern void trigger_data_free(struct event_trigger_data *data);
1661 extern int event_trigger_init(struct event_trigger_ops *ops,
1662 struct event_trigger_data *data);
1663 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1664 int trigger_enable);
1665 extern void update_cond_flag(struct trace_event_file *file);
1666 extern int set_trigger_filter(char *filter_str,
1667 struct event_trigger_data *trigger_data,
1668 struct trace_event_file *file);
1669 extern struct event_trigger_data *find_named_trigger(const char *name);
1670 extern bool is_named_trigger(struct event_trigger_data *test);
1671 extern int save_named_trigger(const char *name,
1672 struct event_trigger_data *data);
1673 extern void del_named_trigger(struct event_trigger_data *data);
1674 extern void pause_named_trigger(struct event_trigger_data *data);
1675 extern void unpause_named_trigger(struct event_trigger_data *data);
1676 extern void set_named_trigger_data(struct event_trigger_data *data,
1677 struct event_trigger_data *named_data);
1678 extern struct event_trigger_data *
1679 get_named_trigger_data(struct event_trigger_data *data);
1680 extern int register_event_command(struct event_command *cmd);
1681 extern int unregister_event_command(struct event_command *cmd);
1682 extern int register_trigger_hist_enable_disable_cmds(void);
1685 * struct event_trigger_ops - callbacks for trace event triggers
1687 * The methods in this structure provide per-event trigger hooks for
1688 * various trigger operations.
1690 * All the methods below, except for @init() and @free(), must be
1693 * @func: The trigger 'probe' function called when the triggering
1694 * event occurs. The data passed into this callback is the data
1695 * that was supplied to the event_command @reg() function that
1696 * registered the trigger (see struct event_command) along with
1697 * the trace record, rec.
1699 * @init: An optional initialization function called for the trigger
1700 * when the trigger is registered (via the event_command reg()
1701 * function). This can be used to perform per-trigger
1702 * initialization such as incrementing a per-trigger reference
1703 * count, for instance. This is usually implemented by the
1704 * generic utility function @event_trigger_init() (see
1705 * trace_event_triggers.c).
1707 * @free: An optional de-initialization function called for the
1708 * trigger when the trigger is unregistered (via the
1709 * event_command @reg() function). This can be used to perform
1710 * per-trigger de-initialization such as decrementing a
1711 * per-trigger reference count and freeing corresponding trigger
1712 * data, for instance. This is usually implemented by the
1713 * generic utility function @event_trigger_free() (see
1714 * trace_event_triggers.c).
1716 * @print: The callback function invoked to have the trigger print
1717 * itself. This is usually implemented by a wrapper function
1718 * that calls the generic utility function @event_trigger_print()
1719 * (see trace_event_triggers.c).
1721 struct event_trigger_ops {
1722 void (*func)(struct event_trigger_data *data,
1724 struct ring_buffer_event *rbe);
1725 int (*init)(struct event_trigger_ops *ops,
1726 struct event_trigger_data *data);
1727 void (*free)(struct event_trigger_ops *ops,
1728 struct event_trigger_data *data);
1729 int (*print)(struct seq_file *m,
1730 struct event_trigger_ops *ops,
1731 struct event_trigger_data *data);
1735 * struct event_command - callbacks and data members for event commands
1737 * Event commands are invoked by users by writing the command name
1738 * into the 'trigger' file associated with a trace event. The
1739 * parameters associated with a specific invocation of an event
1740 * command are used to create an event trigger instance, which is
1741 * added to the list of trigger instances associated with that trace
1742 * event. When the event is hit, the set of triggers associated with
1743 * that event is invoked.
1745 * The data members in this structure provide per-event command data
1746 * for various event commands.
1748 * All the data members below, except for @post_trigger, must be set
1749 * for each event command.
1751 * @name: The unique name that identifies the event command. This is
1752 * the name used when setting triggers via trigger files.
1754 * @trigger_type: A unique id that identifies the event command
1755 * 'type'. This value has two purposes, the first to ensure that
1756 * only one trigger of the same type can be set at a given time
1757 * for a particular event e.g. it doesn't make sense to have both
1758 * a traceon and traceoff trigger attached to a single event at
1759 * the same time, so traceon and traceoff have the same type
1760 * though they have different names. The @trigger_type value is
1761 * also used as a bit value for deferring the actual trigger
1762 * action until after the current event is finished. Some
1763 * commands need to do this if they themselves log to the trace
1764 * buffer (see the @post_trigger() member below). @trigger_type
1765 * values are defined by adding new values to the trigger_type
1766 * enum in include/linux/trace_events.h.
1768 * @flags: See the enum event_command_flags below.
1770 * All the methods below, except for @set_filter() and @unreg_all(),
1771 * must be implemented.
1773 * @func: The callback function responsible for parsing and
1774 * registering the trigger written to the 'trigger' file by the
1775 * user. It allocates the trigger instance and registers it with
1776 * the appropriate trace event. It makes use of the other
1777 * event_command callback functions to orchestrate this, and is
1778 * usually implemented by the generic utility function
1779 * @event_trigger_callback() (see trace_event_triggers.c).
1781 * @reg: Adds the trigger to the list of triggers associated with the
1782 * event, and enables the event trigger itself, after
1783 * initializing it (via the event_trigger_ops @init() function).
1784 * This is also where commands can use the @trigger_type value to
1785 * make the decision as to whether or not multiple instances of
1786 * the trigger should be allowed. This is usually implemented by
1787 * the generic utility function @register_trigger() (see
1788 * trace_event_triggers.c).
1790 * @unreg: Removes the trigger from the list of triggers associated
1791 * with the event, and disables the event trigger itself, after
1792 * initializing it (via the event_trigger_ops @free() function).
1793 * This is usually implemented by the generic utility function
1794 * @unregister_trigger() (see trace_event_triggers.c).
1796 * @unreg_all: An optional function called to remove all the triggers
1797 * from the list of triggers associated with the event. Called
1798 * when a trigger file is opened in truncate mode.
1800 * @set_filter: An optional function called to parse and set a filter
1801 * for the trigger. If no @set_filter() method is set for the
1802 * event command, filters set by the user for the command will be
1803 * ignored. This is usually implemented by the generic utility
1804 * function @set_trigger_filter() (see trace_event_triggers.c).
1806 * @get_trigger_ops: The callback function invoked to retrieve the
1807 * event_trigger_ops implementation associated with the command.
1809 struct event_command {
1810 struct list_head list;
1812 enum event_trigger_type trigger_type;
1814 int (*func)(struct event_command *cmd_ops,
1815 struct trace_event_file *file,
1816 char *glob, char *cmd, char *params);
1817 int (*reg)(char *glob,
1818 struct event_trigger_ops *ops,
1819 struct event_trigger_data *data,
1820 struct trace_event_file *file);
1821 void (*unreg)(char *glob,
1822 struct event_trigger_ops *ops,
1823 struct event_trigger_data *data,
1824 struct trace_event_file *file);
1825 void (*unreg_all)(struct trace_event_file *file);
1826 int (*set_filter)(char *filter_str,
1827 struct event_trigger_data *data,
1828 struct trace_event_file *file);
1829 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1833 * enum event_command_flags - flags for struct event_command
1835 * @POST_TRIGGER: A flag that says whether or not this command needs
1836 * to have its action delayed until after the current event has
1837 * been closed. Some triggers need to avoid being invoked while
1838 * an event is currently in the process of being logged, since
1839 * the trigger may itself log data into the trace buffer. Thus
1840 * we make sure the current event is committed before invoking
1841 * those triggers. To do that, the trigger invocation is split
1842 * in two - the first part checks the filter using the current
1843 * trace record; if a command has the @post_trigger flag set, it
1844 * sets a bit for itself in the return value, otherwise it
1845 * directly invokes the trigger. Once all commands have been
1846 * either invoked or set their return flag, the current record is
1847 * either committed or discarded. At that point, if any commands
1848 * have deferred their triggers, those commands are finally
1849 * invoked following the close of the current event. In other
1850 * words, if the event_trigger_ops @func() probe implementation
1851 * itself logs to the trace buffer, this flag should be set,
1852 * otherwise it can be left unspecified.
1854 * @NEEDS_REC: A flag that says whether or not this command needs
1855 * access to the trace record in order to perform its function,
1856 * regardless of whether or not it has a filter associated with
1857 * it (filters make a trigger require access to the trace record
1858 * but are not always present).
1860 enum event_command_flags {
1861 EVENT_CMD_FL_POST_TRIGGER = 1,
1862 EVENT_CMD_FL_NEEDS_REC = 2,
1865 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1867 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1870 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1872 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1875 extern int trace_event_enable_disable(struct trace_event_file *file,
1876 int enable, int soft_disable);
1877 extern int tracing_alloc_snapshot(void);
1878 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1879 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1881 extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1882 extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1884 extern const char *__start___trace_bprintk_fmt[];
1885 extern const char *__stop___trace_bprintk_fmt[];
1887 extern const char *__start___tracepoint_str[];
1888 extern const char *__stop___tracepoint_str[];
1890 void trace_printk_control(bool enabled);
1891 void trace_printk_start_comm(void);
1892 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1893 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1895 #define MAX_EVENT_NAME_LEN 64
1897 extern int trace_run_command(const char *buf, int (*createfn)(int, char**));
1898 extern ssize_t trace_parse_run_command(struct file *file,
1899 const char __user *buffer, size_t count, loff_t *ppos,
1900 int (*createfn)(int, char**));
1902 extern unsigned int err_pos(char *cmd, const char *str);
1903 extern void tracing_log_err(struct trace_array *tr,
1904 const char *loc, const char *cmd,
1905 const char **errs, u8 type, u8 pos);
1908 * Normal trace_printk() and friends allocates special buffers
1909 * to do the manipulation, as well as saves the print formats
1910 * into sections to display. But the trace infrastructure wants
1911 * to use these without the added overhead at the price of being
1912 * a bit slower (used mainly for warnings, where we don't care
1913 * about performance). The internal_trace_puts() is for such
1916 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1919 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
1920 extern struct trace_event_call \
1921 __aligned(4) event_##call;
1922 #undef FTRACE_ENTRY_DUP
1923 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
1924 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1925 #undef FTRACE_ENTRY_PACKED
1926 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \
1927 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1929 #include "trace_entries.h"
1931 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1932 int perf_ftrace_event_register(struct trace_event_call *call,
1933 enum trace_reg type, void *data);
1935 #define perf_ftrace_event_register NULL
1938 #ifdef CONFIG_FTRACE_SYSCALLS
1939 void init_ftrace_syscalls(void);
1940 const char *get_syscall_name(int syscall);
1942 static inline void init_ftrace_syscalls(void) { }
1943 static inline const char *get_syscall_name(int syscall)
1949 #ifdef CONFIG_EVENT_TRACING
1950 void trace_event_init(void);
1951 void trace_event_eval_update(struct trace_eval_map **map, int len);
1953 static inline void __init trace_event_init(void) { }
1954 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1957 #ifdef CONFIG_TRACER_SNAPSHOT
1958 void tracing_snapshot_instance(struct trace_array *tr);
1959 int tracing_alloc_snapshot_instance(struct trace_array *tr);
1961 static inline void tracing_snapshot_instance(struct trace_array *tr) { }
1962 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1968 #ifdef CONFIG_PREEMPT_TRACER
1969 void tracer_preempt_on(unsigned long a0, unsigned long a1);
1970 void tracer_preempt_off(unsigned long a0, unsigned long a1);
1972 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
1973 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
1975 #ifdef CONFIG_IRQSOFF_TRACER
1976 void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
1977 void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
1979 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
1980 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
1983 extern struct trace_iterator *tracepoint_print_iter;
1986 * Reset the state of the trace_iterator so that it can read consumed data.
1987 * Normally, the trace_iterator is used for reading the data when it is not
1988 * consumed, and must retain state.
1990 static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1992 const size_t offset = offsetof(struct trace_iterator, seq);
1995 * Keep gcc from complaining about overwriting more than just one
1996 * member in the structure.
1998 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
2003 #endif /* _LINUX_KERNEL_TRACE_H */