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_struct(type, item) __field(type, item)
59 #define __field_desc(type, container, item)
62 #define __array(type, item, size) type item[size];
65 #define __array_desc(type, container, item, size)
67 #undef __dynamic_array
68 #define __dynamic_array(type, item) type item[];
71 #define F_STRUCT(args...) args
74 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
75 struct struct_name { \
76 struct trace_entry ent; \
80 #undef FTRACE_ENTRY_DUP
81 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
83 #undef FTRACE_ENTRY_REG
84 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
86 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
89 #undef FTRACE_ENTRY_PACKED
90 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \
92 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
95 #include "trace_entries.h"
97 /* Use this for memory failure errors */
98 #define MEM_FAIL(condition, fmt, ...) ({ \
99 static bool __section(.data.once) __warned; \
100 int __ret_warn_once = !!(condition); \
102 if (unlikely(__ret_warn_once && !__warned)) { \
104 pr_err("ERROR: " fmt, ##__VA_ARGS__); \
106 unlikely(__ret_warn_once); \
110 * syscalls are special, and need special handling, this is why
111 * they are not included in trace_entries.h
113 struct syscall_trace_enter {
114 struct trace_entry ent;
116 unsigned long args[];
119 struct syscall_trace_exit {
120 struct trace_entry ent;
125 struct kprobe_trace_entry_head {
126 struct trace_entry ent;
130 struct kretprobe_trace_entry_head {
131 struct trace_entry ent;
133 unsigned long ret_ip;
137 * trace_flag_type is an enumeration that holds different
138 * states when a trace occurs. These are:
139 * IRQS_OFF - interrupts were disabled
140 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
141 * NEED_RESCHED - reschedule is requested
142 * HARDIRQ - inside an interrupt handler
143 * SOFTIRQ - inside a softirq handler
145 enum trace_flag_type {
146 TRACE_FLAG_IRQS_OFF = 0x01,
147 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
148 TRACE_FLAG_NEED_RESCHED = 0x04,
149 TRACE_FLAG_HARDIRQ = 0x08,
150 TRACE_FLAG_SOFTIRQ = 0x10,
151 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
152 TRACE_FLAG_NMI = 0x40,
155 #define TRACE_BUF_SIZE 1024
160 * The CPU trace array - it consists of thousands of trace entries
161 * plus some other descriptor data: (for example which task started
164 struct trace_array_cpu {
166 void *buffer_page; /* ring buffer spare */
168 unsigned long entries;
169 unsigned long saved_latency;
170 unsigned long critical_start;
171 unsigned long critical_end;
172 unsigned long critical_sequence;
174 unsigned long policy;
175 unsigned long rt_priority;
176 unsigned long skipped_entries;
177 u64 preempt_timestamp;
180 char comm[TASK_COMM_LEN];
183 #ifdef CONFIG_FUNCTION_TRACER
184 bool ftrace_ignore_pid;
189 struct trace_option_dentry;
191 struct array_buffer {
192 struct trace_array *tr;
193 struct trace_buffer *buffer;
194 struct trace_array_cpu __percpu *data;
199 #define TRACE_FLAGS_MAX_SIZE 32
201 struct trace_options {
202 struct tracer *tracer;
203 struct trace_option_dentry *topts;
206 struct trace_pid_list {
211 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
214 * struct cond_snapshot - conditional snapshot data and callback
216 * The cond_snapshot structure encapsulates a callback function and
217 * data associated with the snapshot for a given tracing instance.
219 * When a snapshot is taken conditionally, by invoking
220 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
221 * passed in turn to the cond_snapshot.update() function. That data
222 * can be compared by the update() implementation with the cond_data
223 * contained wihin the struct cond_snapshot instance associated with
224 * the trace_array. Because the tr->max_lock is held throughout the
225 * update() call, the update() function can directly retrieve the
226 * cond_snapshot and cond_data associated with the per-instance
227 * snapshot associated with the trace_array.
229 * The cond_snapshot.update() implementation can save data to be
230 * associated with the snapshot if it decides to, and returns 'true'
231 * in that case, or it returns 'false' if the conditional snapshot
232 * shouldn't be taken.
234 * The cond_snapshot instance is created and associated with the
235 * user-defined cond_data by tracing_cond_snapshot_enable().
236 * Likewise, the cond_snapshot instance is destroyed and is no longer
237 * associated with the trace instance by
238 * tracing_cond_snapshot_disable().
240 * The method below is required.
242 * @update: When a conditional snapshot is invoked, the update()
243 * callback function is invoked with the tr->max_lock held. The
244 * update() implementation signals whether or not to actually
245 * take the snapshot, by returning 'true' if so, 'false' if no
246 * snapshot should be taken. Because the max_lock is held for
247 * the duration of update(), the implementation is safe to
248 * directly retrieven and save any implementation data it needs
249 * to in association with the snapshot.
251 struct cond_snapshot {
253 cond_update_fn_t update;
257 * The trace array - an array of per-CPU trace arrays. This is the
258 * highest level data structure that individual tracers deal with.
259 * They have on/off state as well:
262 struct list_head list;
264 struct array_buffer array_buffer;
265 #ifdef CONFIG_TRACER_MAX_TRACE
267 * The max_buffer is used to snapshot the trace when a maximum
268 * latency is reached, or when the user initiates a snapshot.
269 * Some tracers will use this to store a maximum trace while
270 * it continues examining live traces.
272 * The buffers for the max_buffer are set up the same as the array_buffer
273 * When a snapshot is taken, the buffer of the max_buffer is swapped
274 * with the buffer of the array_buffer and the buffers are reset for
275 * the array_buffer so the tracing can continue.
277 struct array_buffer max_buffer;
278 bool allocated_snapshot;
280 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
281 unsigned long max_latency;
282 #ifdef CONFIG_FSNOTIFY
283 struct dentry *d_max_latency;
284 struct work_struct fsnotify_work;
285 struct irq_work fsnotify_irqwork;
288 struct trace_pid_list __rcu *filtered_pids;
290 * max_lock is used to protect the swapping of buffers
291 * when taking a max snapshot. The buffers themselves are
292 * protected by per_cpu spinlocks. But the action of the swap
293 * needs its own lock.
295 * This is defined as a arch_spinlock_t in order to help
296 * with performance when lockdep debugging is enabled.
298 * It is also used in other places outside the update_max_tr
299 * so it needs to be defined outside of the
300 * CONFIG_TRACER_MAX_TRACE.
302 arch_spinlock_t max_lock;
304 #ifdef CONFIG_FTRACE_SYSCALLS
305 int sys_refcount_enter;
306 int sys_refcount_exit;
307 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
308 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
315 unsigned int n_err_log_entries;
316 struct tracer *current_trace;
317 unsigned int trace_flags;
318 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
320 raw_spinlock_t start_lock;
321 struct list_head err_log;
323 struct dentry *options;
324 struct dentry *percpu_dir;
325 struct dentry *event_dir;
326 struct trace_options *topts;
327 struct list_head systems;
328 struct list_head events;
329 struct trace_event_file *trace_marker_file;
330 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
332 #ifdef CONFIG_FUNCTION_TRACER
333 struct ftrace_ops *ops;
334 struct trace_pid_list __rcu *function_pids;
335 #ifdef CONFIG_DYNAMIC_FTRACE
336 /* All of these are protected by the ftrace_lock */
337 struct list_head func_probes;
338 struct list_head mod_trace;
339 struct list_head mod_notrace;
341 /* function tracing enabled */
342 int function_enabled;
344 int time_stamp_abs_ref;
345 struct list_head hist_vars;
346 #ifdef CONFIG_TRACER_SNAPSHOT
347 struct cond_snapshot *cond_snapshot;
352 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
355 extern struct list_head ftrace_trace_arrays;
357 extern struct mutex trace_types_lock;
359 extern int trace_array_get(struct trace_array *tr);
360 extern int tracing_check_open_get_tr(struct trace_array *tr);
361 extern struct trace_array *trace_array_find(const char *instance);
362 extern struct trace_array *trace_array_find_get(const char *instance);
364 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs);
365 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
367 extern bool trace_clock_in_ns(struct trace_array *tr);
370 * The global tracer (top) should be the first trace array added,
371 * but we check the flag anyway.
373 static inline struct trace_array *top_trace_array(void)
375 struct trace_array *tr;
377 if (list_empty(&ftrace_trace_arrays))
380 tr = list_entry(ftrace_trace_arrays.prev,
382 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
386 #define FTRACE_CMP_TYPE(var, type) \
387 __builtin_types_compatible_p(typeof(var), type *)
390 #define IF_ASSIGN(var, entry, etype, id) \
391 if (FTRACE_CMP_TYPE(var, etype)) { \
392 var = (typeof(var))(entry); \
393 WARN_ON(id != 0 && (entry)->type != id); \
397 /* Will cause compile errors if type is not found. */
398 extern void __ftrace_bad_type(void);
401 * The trace_assign_type is a verifier that the entry type is
402 * the same as the type being assigned. To add new types simply
403 * add a line with the following format:
405 * IF_ASSIGN(var, ent, type, id);
407 * Where "type" is the trace type that includes the trace_entry
408 * as the "ent" item. And "id" is the trace identifier that is
409 * used in the trace_type enum.
411 * If the type can have more than one id, then use zero.
413 #define trace_assign_type(var, ent) \
415 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
416 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
417 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
418 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
419 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
420 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
421 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
422 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
423 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
424 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
426 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
428 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
429 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
431 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
433 __ftrace_bad_type(); \
437 * An option specific to a tracer. This is a boolean value.
438 * The bit is the bit index that sets its value on the
439 * flags value in struct tracer_flags.
442 const char *name; /* Will appear on the trace_options file */
443 u32 bit; /* Mask assigned in val field in tracer_flags */
447 * The set of specific options for a tracer. Your tracer
448 * have to set the initial value of the flags val.
450 struct tracer_flags {
452 struct tracer_opt *opts;
453 struct tracer *trace;
456 /* Makes more easy to define a tracer opt */
457 #define TRACER_OPT(s, b) .name = #s, .bit = b
460 struct trace_option_dentry {
461 struct tracer_opt *opt;
462 struct tracer_flags *flags;
463 struct trace_array *tr;
464 struct dentry *entry;
468 * struct tracer - a specific tracer and its callbacks to interact with tracefs
469 * @name: the name chosen to select it on the available_tracers file
470 * @init: called when one switches to this tracer (echo name > current_tracer)
471 * @reset: called when one switches to another tracer
472 * @start: called when tracing is unpaused (echo 1 > tracing_on)
473 * @stop: called when tracing is paused (echo 0 > tracing_on)
474 * @update_thresh: called when tracing_thresh is updated
475 * @open: called when the trace file is opened
476 * @pipe_open: called when the trace_pipe file is opened
477 * @close: called when the trace file is released
478 * @pipe_close: called when the trace_pipe file is released
479 * @read: override the default read callback on trace_pipe
480 * @splice_read: override the default splice_read callback on trace_pipe
481 * @selftest: selftest to run on boot (see trace_selftest.c)
482 * @print_headers: override the first lines that describe your columns
483 * @print_line: callback that prints a trace
484 * @set_flag: signals one of your private flags changed (trace_options file)
485 * @flags: your private flags
489 int (*init)(struct trace_array *tr);
490 void (*reset)(struct trace_array *tr);
491 void (*start)(struct trace_array *tr);
492 void (*stop)(struct trace_array *tr);
493 int (*update_thresh)(struct trace_array *tr);
494 void (*open)(struct trace_iterator *iter);
495 void (*pipe_open)(struct trace_iterator *iter);
496 void (*close)(struct trace_iterator *iter);
497 void (*pipe_close)(struct trace_iterator *iter);
498 ssize_t (*read)(struct trace_iterator *iter,
499 struct file *filp, char __user *ubuf,
500 size_t cnt, loff_t *ppos);
501 ssize_t (*splice_read)(struct trace_iterator *iter,
504 struct pipe_inode_info *pipe,
507 #ifdef CONFIG_FTRACE_STARTUP_TEST
508 int (*selftest)(struct tracer *trace,
509 struct trace_array *tr);
511 void (*print_header)(struct seq_file *m);
512 enum print_line_t (*print_line)(struct trace_iterator *iter);
513 /* If you handled the flag setting, return 0 */
514 int (*set_flag)(struct trace_array *tr,
515 u32 old_flags, u32 bit, int set);
516 /* Return 0 if OK with change, else return non-zero */
517 int (*flag_changed)(struct trace_array *tr,
520 struct tracer_flags *flags;
524 bool allow_instances;
525 #ifdef CONFIG_TRACER_MAX_TRACE
528 /* True if tracer cannot be enabled in kernel param */
533 /* Only current can touch trace_recursion */
536 * For function tracing recursion:
537 * The order of these bits are important.
539 * When function tracing occurs, the following steps are made:
540 * If arch does not support a ftrace feature:
541 * call internal function (uses INTERNAL bits) which calls...
542 * If callback is registered to the "global" list, the list
543 * function is called and recursion checks the GLOBAL bits.
544 * then this function calls...
545 * The function callback, which can use the FTRACE bits to
546 * check for recursion.
548 * Now if the arch does not suppport a feature, and it calls
549 * the global list function which calls the ftrace callback
550 * all three of these steps will do a recursion protection.
551 * There's no reason to do one if the previous caller already
552 * did. The recursion that we are protecting against will
553 * go through the same steps again.
555 * To prevent the multiple recursion checks, if a recursion
556 * bit is set that is higher than the MAX bit of the current
557 * check, then we know that the check was made by the previous
558 * caller, and we can skip the current check.
562 TRACE_BUFFER_NMI_BIT,
563 TRACE_BUFFER_IRQ_BIT,
564 TRACE_BUFFER_SIRQ_BIT,
566 /* Start of function recursion bits */
568 TRACE_FTRACE_NMI_BIT,
569 TRACE_FTRACE_IRQ_BIT,
570 TRACE_FTRACE_SIRQ_BIT,
572 /* INTERNAL_BITs must be greater than FTRACE_BITs */
574 TRACE_INTERNAL_NMI_BIT,
575 TRACE_INTERNAL_IRQ_BIT,
576 TRACE_INTERNAL_SIRQ_BIT,
580 * Abuse of the trace_recursion.
581 * As we need a way to maintain state if we are tracing the function
582 * graph in irq because we want to trace a particular function that
583 * was called in irq context but we have irq tracing off. Since this
584 * can only be modified by current, we can reuse trace_recursion.
588 /* Set if the function is in the set_graph_function file */
592 * In the very unlikely case that an interrupt came in
593 * at a start of graph tracing, and we want to trace
594 * the function in that interrupt, the depth can be greater
595 * than zero, because of the preempted start of a previous
596 * trace. In an even more unlikely case, depth could be 2
597 * if a softirq interrupted the start of graph tracing,
598 * followed by an interrupt preempting a start of graph
599 * tracing in the softirq, and depth can even be 3
600 * if an NMI came in at the start of an interrupt function
601 * that preempted a softirq start of a function that
602 * preempted normal context!!!! Luckily, it can't be
603 * greater than 3, so the next two bits are a mask
604 * of what the depth is when we set TRACE_GRAPH_BIT
607 TRACE_GRAPH_DEPTH_START_BIT,
608 TRACE_GRAPH_DEPTH_END_BIT,
611 * To implement set_graph_notrace, if this bit is set, we ignore
612 * function graph tracing of called functions, until the return
613 * function is called to clear it.
615 TRACE_GRAPH_NOTRACE_BIT,
618 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
619 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
620 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
622 #define trace_recursion_depth() \
623 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3)
624 #define trace_recursion_set_depth(depth) \
626 current->trace_recursion &= \
627 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \
628 current->trace_recursion |= \
629 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \
632 #define TRACE_CONTEXT_BITS 4
634 #define TRACE_FTRACE_START TRACE_FTRACE_BIT
635 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
637 #define TRACE_LIST_START TRACE_INTERNAL_BIT
638 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
640 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX
642 static __always_inline int trace_get_context_bit(void)
646 if (in_interrupt()) {
660 static __always_inline int trace_test_and_set_recursion(int start, int max)
662 unsigned int val = current->trace_recursion;
665 /* A previous recursion check was made */
666 if ((val & TRACE_CONTEXT_MASK) > max)
669 bit = trace_get_context_bit() + start;
670 if (unlikely(val & (1 << bit)))
674 current->trace_recursion = val;
680 static __always_inline void trace_clear_recursion(int bit)
682 unsigned int val = current->trace_recursion;
691 current->trace_recursion = val;
694 static inline struct ring_buffer_iter *
695 trace_buffer_iter(struct trace_iterator *iter, int cpu)
697 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
700 int tracer_init(struct tracer *t, struct trace_array *tr);
701 int tracing_is_enabled(void);
702 void tracing_reset_online_cpus(struct array_buffer *buf);
703 void tracing_reset_current(int cpu);
704 void tracing_reset_all_online_cpus(void);
705 int tracing_open_generic(struct inode *inode, struct file *filp);
706 int tracing_open_generic_tr(struct inode *inode, struct file *filp);
707 bool tracing_is_disabled(void);
708 bool tracer_tracing_is_on(struct trace_array *tr);
709 void tracer_tracing_on(struct trace_array *tr);
710 void tracer_tracing_off(struct trace_array *tr);
711 struct dentry *trace_create_file(const char *name,
713 struct dentry *parent,
715 const struct file_operations *fops);
717 struct dentry *tracing_init_dentry(void);
719 struct ring_buffer_event;
721 struct ring_buffer_event *
722 trace_buffer_lock_reserve(struct trace_buffer *buffer,
728 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
729 struct trace_array_cpu *data);
731 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
732 int *ent_cpu, u64 *ent_ts);
734 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
735 struct ring_buffer_event *event);
737 int trace_empty(struct trace_iterator *iter);
739 void *trace_find_next_entry_inc(struct trace_iterator *iter);
741 void trace_init_global_iter(struct trace_iterator *iter);
743 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
745 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
746 unsigned long trace_total_entries(struct trace_array *tr);
748 void trace_function(struct trace_array *tr,
750 unsigned long parent_ip,
751 unsigned long flags, int pc);
752 void trace_graph_function(struct trace_array *tr,
754 unsigned long parent_ip,
755 unsigned long flags, int pc);
756 void trace_latency_header(struct seq_file *m);
757 void trace_default_header(struct seq_file *m);
758 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
759 int trace_empty(struct trace_iterator *iter);
761 void trace_graph_return(struct ftrace_graph_ret *trace);
762 int trace_graph_entry(struct ftrace_graph_ent *trace);
763 void set_graph_array(struct trace_array *tr);
765 void tracing_start_cmdline_record(void);
766 void tracing_stop_cmdline_record(void);
767 void tracing_start_tgid_record(void);
768 void tracing_stop_tgid_record(void);
770 int register_tracer(struct tracer *type);
771 int is_tracing_stopped(void);
773 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
775 extern cpumask_var_t __read_mostly tracing_buffer_mask;
777 #define for_each_tracing_cpu(cpu) \
778 for_each_cpu(cpu, tracing_buffer_mask)
780 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
782 extern unsigned long tracing_thresh;
788 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
790 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
791 struct task_struct *task);
792 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
793 struct task_struct *self,
794 struct task_struct *task);
795 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
796 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
797 int trace_pid_show(struct seq_file *m, void *v);
798 void trace_free_pid_list(struct trace_pid_list *pid_list);
799 int trace_pid_write(struct trace_pid_list *filtered_pids,
800 struct trace_pid_list **new_pid_list,
801 const char __user *ubuf, size_t cnt);
803 #ifdef CONFIG_TRACER_MAX_TRACE
804 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
806 void update_max_tr_single(struct trace_array *tr,
807 struct task_struct *tsk, int cpu);
808 #endif /* CONFIG_TRACER_MAX_TRACE */
810 #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \
811 defined(CONFIG_FSNOTIFY)
813 void latency_fsnotify(struct trace_array *tr);
817 static inline void latency_fsnotify(struct trace_array *tr) { }
821 #ifdef CONFIG_STACKTRACE
822 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
825 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
829 #endif /* CONFIG_STACKTRACE */
831 extern u64 ftrace_now(int cpu);
833 extern void trace_find_cmdline(int pid, char comm[]);
834 extern int trace_find_tgid(int pid);
835 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
837 #ifdef CONFIG_DYNAMIC_FTRACE
838 extern unsigned long ftrace_update_tot_cnt;
839 extern unsigned long ftrace_number_of_pages;
840 extern unsigned long ftrace_number_of_groups;
841 void ftrace_init_trace_array(struct trace_array *tr);
843 static inline void ftrace_init_trace_array(struct trace_array *tr) { }
845 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
846 extern int DYN_FTRACE_TEST_NAME(void);
847 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
848 extern int DYN_FTRACE_TEST_NAME2(void);
850 extern bool ring_buffer_expanded;
851 extern bool tracing_selftest_disabled;
853 #ifdef CONFIG_FTRACE_STARTUP_TEST
854 extern int trace_selftest_startup_function(struct tracer *trace,
855 struct trace_array *tr);
856 extern int trace_selftest_startup_function_graph(struct tracer *trace,
857 struct trace_array *tr);
858 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
859 struct trace_array *tr);
860 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
861 struct trace_array *tr);
862 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
863 struct trace_array *tr);
864 extern int trace_selftest_startup_wakeup(struct tracer *trace,
865 struct trace_array *tr);
866 extern int trace_selftest_startup_nop(struct tracer *trace,
867 struct trace_array *tr);
868 extern int trace_selftest_startup_branch(struct tracer *trace,
869 struct trace_array *tr);
871 * Tracer data references selftest functions that only occur
872 * on boot up. These can be __init functions. Thus, when selftests
873 * are enabled, then the tracers need to reference __init functions.
875 #define __tracer_data __refdata
877 /* Tracers are seldom changed. Optimize when selftests are disabled. */
878 #define __tracer_data __read_mostly
879 #endif /* CONFIG_FTRACE_STARTUP_TEST */
881 extern void *head_page(struct trace_array_cpu *data);
882 extern unsigned long long ns2usecs(u64 nsec);
884 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
886 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
888 trace_array_vprintk(struct trace_array *tr,
889 unsigned long ip, const char *fmt, va_list args);
890 int trace_array_printk_buf(struct trace_buffer *buffer,
891 unsigned long ip, const char *fmt, ...);
892 void trace_printk_seq(struct trace_seq *s);
893 enum print_line_t print_trace_line(struct trace_iterator *iter);
895 extern char trace_find_mark(unsigned long long duration);
899 struct ftrace_mod_load {
900 struct list_head list;
907 FTRACE_HASH_FL_MOD = (1 << 0),
911 unsigned long size_bits;
912 struct hlist_head *buckets;
918 struct ftrace_func_entry *
919 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
921 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
923 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
926 /* Standard output formatting function used for function return traces */
927 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
930 #define TRACE_GRAPH_PRINT_OVERRUN 0x1
931 #define TRACE_GRAPH_PRINT_CPU 0x2
932 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
933 #define TRACE_GRAPH_PRINT_PROC 0x8
934 #define TRACE_GRAPH_PRINT_DURATION 0x10
935 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
936 #define TRACE_GRAPH_PRINT_REL_TIME 0x40
937 #define TRACE_GRAPH_PRINT_IRQS 0x80
938 #define TRACE_GRAPH_PRINT_TAIL 0x100
939 #define TRACE_GRAPH_SLEEP_TIME 0x200
940 #define TRACE_GRAPH_GRAPH_TIME 0x400
941 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
942 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
944 extern void ftrace_graph_sleep_time_control(bool enable);
946 #ifdef CONFIG_FUNCTION_PROFILER
947 extern void ftrace_graph_graph_time_control(bool enable);
949 static inline void ftrace_graph_graph_time_control(bool enable) { }
952 extern enum print_line_t
953 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
954 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
956 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
957 extern void graph_trace_open(struct trace_iterator *iter);
958 extern void graph_trace_close(struct trace_iterator *iter);
959 extern int __trace_graph_entry(struct trace_array *tr,
960 struct ftrace_graph_ent *trace,
961 unsigned long flags, int pc);
962 extern void __trace_graph_return(struct trace_array *tr,
963 struct ftrace_graph_ret *trace,
964 unsigned long flags, int pc);
966 #ifdef CONFIG_DYNAMIC_FTRACE
967 extern struct ftrace_hash __rcu *ftrace_graph_hash;
968 extern struct ftrace_hash *ftrace_graph_notrace_hash;
970 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
972 unsigned long addr = trace->func;
974 struct ftrace_hash *hash;
976 preempt_disable_notrace();
978 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
980 if (ftrace_hash_empty(hash)) {
985 if (ftrace_lookup_ip(hash, addr)) {
988 * This needs to be cleared on the return functions
989 * when the depth is zero.
991 trace_recursion_set(TRACE_GRAPH_BIT);
992 trace_recursion_set_depth(trace->depth);
995 * If no irqs are to be traced, but a set_graph_function
996 * is set, and called by an interrupt handler, we still
1000 trace_recursion_set(TRACE_IRQ_BIT);
1002 trace_recursion_clear(TRACE_IRQ_BIT);
1007 preempt_enable_notrace();
1011 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
1013 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
1014 trace->depth == trace_recursion_depth())
1015 trace_recursion_clear(TRACE_GRAPH_BIT);
1018 static inline int ftrace_graph_notrace_addr(unsigned long addr)
1022 preempt_disable_notrace();
1024 if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr))
1027 preempt_enable_notrace();
1031 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
1036 static inline int ftrace_graph_notrace_addr(unsigned long addr)
1040 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
1042 #endif /* CONFIG_DYNAMIC_FTRACE */
1044 extern unsigned int fgraph_max_depth;
1046 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
1048 /* trace it when it is-nested-in or is a function enabled. */
1049 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
1050 ftrace_graph_addr(trace)) ||
1051 (trace->depth < 0) ||
1052 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
1055 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
1056 static inline enum print_line_t
1057 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
1059 return TRACE_TYPE_UNHANDLED;
1061 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
1063 extern struct list_head ftrace_pids;
1065 #ifdef CONFIG_FUNCTION_TRACER
1066 struct ftrace_func_command {
1067 struct list_head list;
1069 int (*func)(struct trace_array *tr,
1070 struct ftrace_hash *hash,
1071 char *func, char *cmd,
1072 char *params, int enable);
1074 extern bool ftrace_filter_param __initdata;
1075 static inline int ftrace_trace_task(struct trace_array *tr)
1077 return !this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid);
1079 extern int ftrace_is_dead(void);
1080 int ftrace_create_function_files(struct trace_array *tr,
1081 struct dentry *parent);
1082 void ftrace_destroy_function_files(struct trace_array *tr);
1083 void ftrace_init_global_array_ops(struct trace_array *tr);
1084 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
1085 void ftrace_reset_array_ops(struct trace_array *tr);
1086 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
1087 void ftrace_init_tracefs_toplevel(struct trace_array *tr,
1088 struct dentry *d_tracer);
1089 void ftrace_clear_pids(struct trace_array *tr);
1090 int init_function_trace(void);
1091 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
1093 static inline int ftrace_trace_task(struct trace_array *tr)
1097 static inline int ftrace_is_dead(void) { return 0; }
1099 ftrace_create_function_files(struct trace_array *tr,
1100 struct dentry *parent)
1104 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1105 static inline __init void
1106 ftrace_init_global_array_ops(struct trace_array *tr) { }
1107 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1108 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
1109 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
1110 static inline void ftrace_clear_pids(struct trace_array *tr) { }
1111 static inline int init_function_trace(void) { return 0; }
1112 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1113 /* ftace_func_t type is not defined, use macro instead of static inline */
1114 #define ftrace_init_array_ops(tr, func) do { } while (0)
1115 #endif /* CONFIG_FUNCTION_TRACER */
1117 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1119 struct ftrace_probe_ops {
1120 void (*func)(unsigned long ip,
1121 unsigned long parent_ip,
1122 struct trace_array *tr,
1123 struct ftrace_probe_ops *ops,
1125 int (*init)(struct ftrace_probe_ops *ops,
1126 struct trace_array *tr,
1127 unsigned long ip, void *init_data,
1129 void (*free)(struct ftrace_probe_ops *ops,
1130 struct trace_array *tr,
1131 unsigned long ip, void *data);
1132 int (*print)(struct seq_file *m,
1134 struct ftrace_probe_ops *ops,
1138 struct ftrace_func_mapper;
1139 typedef int (*ftrace_mapper_func)(void *data);
1141 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1142 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1144 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1145 unsigned long ip, void *data);
1146 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1148 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1149 ftrace_mapper_func free_func);
1152 register_ftrace_function_probe(char *glob, struct trace_array *tr,
1153 struct ftrace_probe_ops *ops, void *data);
1155 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1156 struct ftrace_probe_ops *ops);
1157 extern void clear_ftrace_function_probes(struct trace_array *tr);
1159 int register_ftrace_command(struct ftrace_func_command *cmd);
1160 int unregister_ftrace_command(struct ftrace_func_command *cmd);
1162 void ftrace_create_filter_files(struct ftrace_ops *ops,
1163 struct dentry *parent);
1164 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1166 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
1167 int len, int reset);
1168 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
1169 int len, int reset);
1171 struct ftrace_func_command;
1173 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1177 static inline __init int unregister_ftrace_command(char *cmd_name)
1181 static inline void clear_ftrace_function_probes(struct trace_array *tr)
1186 * The ops parameter passed in is usually undefined.
1187 * This must be a macro.
1189 #define ftrace_create_filter_files(ops, parent) do { } while (0)
1190 #define ftrace_destroy_filter_files(ops) do { } while (0)
1191 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1193 bool ftrace_event_is_function(struct trace_event_call *call);
1196 * struct trace_parser - servers for reading the user input separated by spaces
1197 * @cont: set if the input is not complete - no final space char was found
1198 * @buffer: holds the parsed user input
1199 * @idx: user input length
1200 * @size: buffer size
1202 struct trace_parser {
1209 static inline bool trace_parser_loaded(struct trace_parser *parser)
1211 return (parser->idx != 0);
1214 static inline bool trace_parser_cont(struct trace_parser *parser)
1216 return parser->cont;
1219 static inline void trace_parser_clear(struct trace_parser *parser)
1221 parser->cont = false;
1225 extern int trace_parser_get_init(struct trace_parser *parser, int size);
1226 extern void trace_parser_put(struct trace_parser *parser);
1227 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1228 size_t cnt, loff_t *ppos);
1231 * Only create function graph options if function graph is configured.
1233 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1234 # define FGRAPH_FLAGS \
1235 C(DISPLAY_GRAPH, "display-graph"),
1237 # define FGRAPH_FLAGS
1240 #ifdef CONFIG_BRANCH_TRACER
1241 # define BRANCH_FLAGS \
1242 C(BRANCH, "branch"),
1244 # define BRANCH_FLAGS
1247 #ifdef CONFIG_FUNCTION_TRACER
1248 # define FUNCTION_FLAGS \
1249 C(FUNCTION, "function-trace"), \
1250 C(FUNC_FORK, "function-fork"),
1251 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1253 # define FUNCTION_FLAGS
1254 # define FUNCTION_DEFAULT_FLAGS 0UL
1255 # define TRACE_ITER_FUNC_FORK 0UL
1258 #ifdef CONFIG_STACKTRACE
1259 # define STACK_FLAGS \
1260 C(STACKTRACE, "stacktrace"),
1262 # define STACK_FLAGS
1266 * trace_iterator_flags is an enumeration that defines bit
1267 * positions into trace_flags that controls the output.
1269 * NOTE: These bits must match the trace_options array in
1270 * trace.c (this macro guarantees it).
1272 #define TRACE_FLAGS \
1273 C(PRINT_PARENT, "print-parent"), \
1274 C(SYM_OFFSET, "sym-offset"), \
1275 C(SYM_ADDR, "sym-addr"), \
1276 C(VERBOSE, "verbose"), \
1280 C(BLOCK, "block"), \
1281 C(PRINTK, "trace_printk"), \
1282 C(ANNOTATE, "annotate"), \
1283 C(USERSTACKTRACE, "userstacktrace"), \
1284 C(SYM_USEROBJ, "sym-userobj"), \
1285 C(PRINTK_MSGONLY, "printk-msg-only"), \
1286 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1287 C(LATENCY_FMT, "latency-format"), \
1288 C(RECORD_CMD, "record-cmd"), \
1289 C(RECORD_TGID, "record-tgid"), \
1290 C(OVERWRITE, "overwrite"), \
1291 C(STOP_ON_FREE, "disable_on_free"), \
1292 C(IRQ_INFO, "irq-info"), \
1293 C(MARKERS, "markers"), \
1294 C(EVENT_FORK, "event-fork"), \
1301 * By defining C, we can make TRACE_FLAGS a list of bit names
1302 * that will define the bits for the flag masks.
1305 #define C(a, b) TRACE_ITER_##a##_BIT
1307 enum trace_iterator_bits {
1309 /* Make sure we don't go more than we have bits for */
1314 * By redefining C, we can make TRACE_FLAGS a list of masks that
1315 * use the bits as defined above.
1318 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1320 enum trace_iterator_flags { TRACE_FLAGS };
1323 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1324 * control the output of kernel symbols.
1326 #define TRACE_ITER_SYM_MASK \
1327 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1329 extern struct tracer nop_trace;
1331 #ifdef CONFIG_BRANCH_TRACER
1332 extern int enable_branch_tracing(struct trace_array *tr);
1333 extern void disable_branch_tracing(void);
1334 static inline int trace_branch_enable(struct trace_array *tr)
1336 if (tr->trace_flags & TRACE_ITER_BRANCH)
1337 return enable_branch_tracing(tr);
1340 static inline void trace_branch_disable(void)
1342 /* due to races, always disable */
1343 disable_branch_tracing();
1346 static inline int trace_branch_enable(struct trace_array *tr)
1350 static inline void trace_branch_disable(void)
1353 #endif /* CONFIG_BRANCH_TRACER */
1355 /* set ring buffers to default size if not already done so */
1356 int tracing_update_buffers(void);
1358 struct ftrace_event_field {
1359 struct list_head link;
1370 struct event_filter {
1371 struct prog_entry __rcu *prog;
1372 char *filter_string;
1375 struct event_subsystem {
1376 struct list_head list;
1378 struct event_filter *filter;
1382 struct trace_subsystem_dir {
1383 struct list_head list;
1384 struct event_subsystem *subsystem;
1385 struct trace_array *tr;
1386 struct dentry *entry;
1391 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1392 struct trace_buffer *buffer,
1393 struct ring_buffer_event *event);
1395 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1396 struct trace_buffer *buffer,
1397 struct ring_buffer_event *event,
1398 unsigned long flags, int pc,
1399 struct pt_regs *regs);
1401 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1402 struct trace_buffer *buffer,
1403 struct ring_buffer_event *event,
1404 unsigned long flags, int pc)
1406 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
1409 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1410 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1411 void trace_buffered_event_disable(void);
1412 void trace_buffered_event_enable(void);
1415 __trace_event_discard_commit(struct trace_buffer *buffer,
1416 struct ring_buffer_event *event)
1418 if (this_cpu_read(trace_buffered_event) == event) {
1419 /* Simply release the temp buffer */
1420 this_cpu_dec(trace_buffered_event_cnt);
1423 ring_buffer_discard_commit(buffer, event);
1427 * Helper function for event_trigger_unlock_commit{_regs}().
1428 * If there are event triggers attached to this event that requires
1429 * filtering against its fields, then they wil be called as the
1430 * entry already holds the field information of the current event.
1432 * It also checks if the event should be discarded or not.
1433 * It is to be discarded if the event is soft disabled and the
1434 * event was only recorded to process triggers, or if the event
1435 * filter is active and this event did not match the filters.
1437 * Returns true if the event is discarded, false otherwise.
1440 __event_trigger_test_discard(struct trace_event_file *file,
1441 struct trace_buffer *buffer,
1442 struct ring_buffer_event *event,
1444 enum event_trigger_type *tt)
1446 unsigned long eflags = file->flags;
1448 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1449 *tt = event_triggers_call(file, entry, event);
1451 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1452 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1453 !filter_match_preds(file->filter, entry))) {
1454 __trace_event_discard_commit(buffer, event);
1462 * event_trigger_unlock_commit - handle triggers and finish event commit
1463 * @file: The file pointer assoctiated to the event
1464 * @buffer: The ring buffer that the event is being written to
1465 * @event: The event meta data in the ring buffer
1466 * @entry: The event itself
1467 * @irq_flags: The state of the interrupts at the start of the event
1468 * @pc: The state of the preempt count at the start of the event.
1470 * This is a helper function to handle triggers that require data
1471 * from the event itself. It also tests the event against filters and
1472 * if the event is soft disabled and should be discarded.
1475 event_trigger_unlock_commit(struct trace_event_file *file,
1476 struct trace_buffer *buffer,
1477 struct ring_buffer_event *event,
1478 void *entry, unsigned long irq_flags, int pc)
1480 enum event_trigger_type tt = ETT_NONE;
1482 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1483 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
1486 event_triggers_post_call(file, tt);
1490 * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1491 * @file: The file pointer assoctiated to the event
1492 * @buffer: The ring buffer that the event is being written to
1493 * @event: The event meta data in the ring buffer
1494 * @entry: The event itself
1495 * @irq_flags: The state of the interrupts at the start of the event
1496 * @pc: The state of the preempt count at the start of the event.
1498 * This is a helper function to handle triggers that require data
1499 * from the event itself. It also tests the event against filters and
1500 * if the event is soft disabled and should be discarded.
1502 * Same as event_trigger_unlock_commit() but calls
1503 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1506 event_trigger_unlock_commit_regs(struct trace_event_file *file,
1507 struct trace_buffer *buffer,
1508 struct ring_buffer_event *event,
1509 void *entry, unsigned long irq_flags, int pc,
1510 struct pt_regs *regs)
1512 enum event_trigger_type tt = ETT_NONE;
1514 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1515 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1516 irq_flags, pc, regs);
1519 event_triggers_post_call(file, tt);
1522 #define FILTER_PRED_INVALID ((unsigned short)-1)
1523 #define FILTER_PRED_IS_RIGHT (1 << 15)
1524 #define FILTER_PRED_FOLD (1 << 15)
1527 * The max preds is the size of unsigned short with
1528 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1529 * and FOLD flags. The other is reserved.
1531 * 2^14 preds is way more than enough.
1533 #define MAX_FILTER_PRED 16384
1538 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1540 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1552 char pattern[MAX_FILTER_STR_VAL];
1555 regex_match_func match;
1558 struct filter_pred {
1559 filter_pred_fn_t fn;
1562 unsigned short *ops;
1563 struct ftrace_event_field *field;
1569 static inline bool is_string_field(struct ftrace_event_field *field)
1571 return field->filter_type == FILTER_DYN_STRING ||
1572 field->filter_type == FILTER_STATIC_STRING ||
1573 field->filter_type == FILTER_PTR_STRING ||
1574 field->filter_type == FILTER_COMM;
1577 static inline bool is_function_field(struct ftrace_event_field *field)
1579 return field->filter_type == FILTER_TRACE_FN;
1582 extern enum regex_type
1583 filter_parse_regex(char *buff, int len, char **search, int *not);
1584 extern void print_event_filter(struct trace_event_file *file,
1585 struct trace_seq *s);
1586 extern int apply_event_filter(struct trace_event_file *file,
1587 char *filter_string);
1588 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1589 char *filter_string);
1590 extern void print_subsystem_event_filter(struct event_subsystem *system,
1591 struct trace_seq *s);
1592 extern int filter_assign_type(const char *type);
1593 extern int create_event_filter(struct trace_array *tr,
1594 struct trace_event_call *call,
1595 char *filter_str, bool set_str,
1596 struct event_filter **filterp);
1597 extern void free_event_filter(struct event_filter *filter);
1599 struct ftrace_event_field *
1600 trace_find_event_field(struct trace_event_call *call, char *name);
1602 extern void trace_event_enable_cmd_record(bool enable);
1603 extern void trace_event_enable_tgid_record(bool enable);
1605 extern int event_trace_init(void);
1606 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1607 extern int event_trace_del_tracer(struct trace_array *tr);
1609 extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1612 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1616 static inline void *event_file_data(struct file *filp)
1618 return READ_ONCE(file_inode(filp)->i_private);
1621 extern struct mutex event_mutex;
1622 extern struct list_head ftrace_events;
1624 extern const struct file_operations event_trigger_fops;
1625 extern const struct file_operations event_hist_fops;
1626 extern const struct file_operations event_inject_fops;
1628 #ifdef CONFIG_HIST_TRIGGERS
1629 extern int register_trigger_hist_cmd(void);
1630 extern int register_trigger_hist_enable_disable_cmds(void);
1632 static inline int register_trigger_hist_cmd(void) { return 0; }
1633 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1636 extern int register_trigger_cmds(void);
1637 extern void clear_event_triggers(struct trace_array *tr);
1639 struct event_trigger_data {
1640 unsigned long count;
1642 struct event_trigger_ops *ops;
1643 struct event_command *cmd_ops;
1644 struct event_filter __rcu *filter;
1649 struct list_head list;
1651 struct list_head named_list;
1652 struct event_trigger_data *named_data;
1656 #define ENABLE_EVENT_STR "enable_event"
1657 #define DISABLE_EVENT_STR "disable_event"
1658 #define ENABLE_HIST_STR "enable_hist"
1659 #define DISABLE_HIST_STR "disable_hist"
1661 struct enable_trigger_data {
1662 struct trace_event_file *file;
1667 extern int event_enable_trigger_print(struct seq_file *m,
1668 struct event_trigger_ops *ops,
1669 struct event_trigger_data *data);
1670 extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1671 struct event_trigger_data *data);
1672 extern int event_enable_trigger_func(struct event_command *cmd_ops,
1673 struct trace_event_file *file,
1674 char *glob, char *cmd, char *param);
1675 extern int event_enable_register_trigger(char *glob,
1676 struct event_trigger_ops *ops,
1677 struct event_trigger_data *data,
1678 struct trace_event_file *file);
1679 extern void event_enable_unregister_trigger(char *glob,
1680 struct event_trigger_ops *ops,
1681 struct event_trigger_data *test,
1682 struct trace_event_file *file);
1683 extern void trigger_data_free(struct event_trigger_data *data);
1684 extern int event_trigger_init(struct event_trigger_ops *ops,
1685 struct event_trigger_data *data);
1686 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1687 int trigger_enable);
1688 extern void update_cond_flag(struct trace_event_file *file);
1689 extern int set_trigger_filter(char *filter_str,
1690 struct event_trigger_data *trigger_data,
1691 struct trace_event_file *file);
1692 extern struct event_trigger_data *find_named_trigger(const char *name);
1693 extern bool is_named_trigger(struct event_trigger_data *test);
1694 extern int save_named_trigger(const char *name,
1695 struct event_trigger_data *data);
1696 extern void del_named_trigger(struct event_trigger_data *data);
1697 extern void pause_named_trigger(struct event_trigger_data *data);
1698 extern void unpause_named_trigger(struct event_trigger_data *data);
1699 extern void set_named_trigger_data(struct event_trigger_data *data,
1700 struct event_trigger_data *named_data);
1701 extern struct event_trigger_data *
1702 get_named_trigger_data(struct event_trigger_data *data);
1703 extern int register_event_command(struct event_command *cmd);
1704 extern int unregister_event_command(struct event_command *cmd);
1705 extern int register_trigger_hist_enable_disable_cmds(void);
1708 * struct event_trigger_ops - callbacks for trace event triggers
1710 * The methods in this structure provide per-event trigger hooks for
1711 * various trigger operations.
1713 * All the methods below, except for @init() and @free(), must be
1716 * @func: The trigger 'probe' function called when the triggering
1717 * event occurs. The data passed into this callback is the data
1718 * that was supplied to the event_command @reg() function that
1719 * registered the trigger (see struct event_command) along with
1720 * the trace record, rec.
1722 * @init: An optional initialization function called for the trigger
1723 * when the trigger is registered (via the event_command reg()
1724 * function). This can be used to perform per-trigger
1725 * initialization such as incrementing a per-trigger reference
1726 * count, for instance. This is usually implemented by the
1727 * generic utility function @event_trigger_init() (see
1728 * trace_event_triggers.c).
1730 * @free: An optional de-initialization function called for the
1731 * trigger when the trigger is unregistered (via the
1732 * event_command @reg() function). This can be used to perform
1733 * per-trigger de-initialization such as decrementing a
1734 * per-trigger reference count and freeing corresponding trigger
1735 * data, for instance. This is usually implemented by the
1736 * generic utility function @event_trigger_free() (see
1737 * trace_event_triggers.c).
1739 * @print: The callback function invoked to have the trigger print
1740 * itself. This is usually implemented by a wrapper function
1741 * that calls the generic utility function @event_trigger_print()
1742 * (see trace_event_triggers.c).
1744 struct event_trigger_ops {
1745 void (*func)(struct event_trigger_data *data,
1747 struct ring_buffer_event *rbe);
1748 int (*init)(struct event_trigger_ops *ops,
1749 struct event_trigger_data *data);
1750 void (*free)(struct event_trigger_ops *ops,
1751 struct event_trigger_data *data);
1752 int (*print)(struct seq_file *m,
1753 struct event_trigger_ops *ops,
1754 struct event_trigger_data *data);
1758 * struct event_command - callbacks and data members for event commands
1760 * Event commands are invoked by users by writing the command name
1761 * into the 'trigger' file associated with a trace event. The
1762 * parameters associated with a specific invocation of an event
1763 * command are used to create an event trigger instance, which is
1764 * added to the list of trigger instances associated with that trace
1765 * event. When the event is hit, the set of triggers associated with
1766 * that event is invoked.
1768 * The data members in this structure provide per-event command data
1769 * for various event commands.
1771 * All the data members below, except for @post_trigger, must be set
1772 * for each event command.
1774 * @name: The unique name that identifies the event command. This is
1775 * the name used when setting triggers via trigger files.
1777 * @trigger_type: A unique id that identifies the event command
1778 * 'type'. This value has two purposes, the first to ensure that
1779 * only one trigger of the same type can be set at a given time
1780 * for a particular event e.g. it doesn't make sense to have both
1781 * a traceon and traceoff trigger attached to a single event at
1782 * the same time, so traceon and traceoff have the same type
1783 * though they have different names. The @trigger_type value is
1784 * also used as a bit value for deferring the actual trigger
1785 * action until after the current event is finished. Some
1786 * commands need to do this if they themselves log to the trace
1787 * buffer (see the @post_trigger() member below). @trigger_type
1788 * values are defined by adding new values to the trigger_type
1789 * enum in include/linux/trace_events.h.
1791 * @flags: See the enum event_command_flags below.
1793 * All the methods below, except for @set_filter() and @unreg_all(),
1794 * must be implemented.
1796 * @func: The callback function responsible for parsing and
1797 * registering the trigger written to the 'trigger' file by the
1798 * user. It allocates the trigger instance and registers it with
1799 * the appropriate trace event. It makes use of the other
1800 * event_command callback functions to orchestrate this, and is
1801 * usually implemented by the generic utility function
1802 * @event_trigger_callback() (see trace_event_triggers.c).
1804 * @reg: Adds the trigger to the list of triggers associated with the
1805 * event, and enables the event trigger itself, after
1806 * initializing it (via the event_trigger_ops @init() function).
1807 * This is also where commands can use the @trigger_type value to
1808 * make the decision as to whether or not multiple instances of
1809 * the trigger should be allowed. This is usually implemented by
1810 * the generic utility function @register_trigger() (see
1811 * trace_event_triggers.c).
1813 * @unreg: Removes the trigger from the list of triggers associated
1814 * with the event, and disables the event trigger itself, after
1815 * initializing it (via the event_trigger_ops @free() function).
1816 * This is usually implemented by the generic utility function
1817 * @unregister_trigger() (see trace_event_triggers.c).
1819 * @unreg_all: An optional function called to remove all the triggers
1820 * from the list of triggers associated with the event. Called
1821 * when a trigger file is opened in truncate mode.
1823 * @set_filter: An optional function called to parse and set a filter
1824 * for the trigger. If no @set_filter() method is set for the
1825 * event command, filters set by the user for the command will be
1826 * ignored. This is usually implemented by the generic utility
1827 * function @set_trigger_filter() (see trace_event_triggers.c).
1829 * @get_trigger_ops: The callback function invoked to retrieve the
1830 * event_trigger_ops implementation associated with the command.
1832 struct event_command {
1833 struct list_head list;
1835 enum event_trigger_type trigger_type;
1837 int (*func)(struct event_command *cmd_ops,
1838 struct trace_event_file *file,
1839 char *glob, char *cmd, char *params);
1840 int (*reg)(char *glob,
1841 struct event_trigger_ops *ops,
1842 struct event_trigger_data *data,
1843 struct trace_event_file *file);
1844 void (*unreg)(char *glob,
1845 struct event_trigger_ops *ops,
1846 struct event_trigger_data *data,
1847 struct trace_event_file *file);
1848 void (*unreg_all)(struct trace_event_file *file);
1849 int (*set_filter)(char *filter_str,
1850 struct event_trigger_data *data,
1851 struct trace_event_file *file);
1852 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1856 * enum event_command_flags - flags for struct event_command
1858 * @POST_TRIGGER: A flag that says whether or not this command needs
1859 * to have its action delayed until after the current event has
1860 * been closed. Some triggers need to avoid being invoked while
1861 * an event is currently in the process of being logged, since
1862 * the trigger may itself log data into the trace buffer. Thus
1863 * we make sure the current event is committed before invoking
1864 * those triggers. To do that, the trigger invocation is split
1865 * in two - the first part checks the filter using the current
1866 * trace record; if a command has the @post_trigger flag set, it
1867 * sets a bit for itself in the return value, otherwise it
1868 * directly invokes the trigger. Once all commands have been
1869 * either invoked or set their return flag, the current record is
1870 * either committed or discarded. At that point, if any commands
1871 * have deferred their triggers, those commands are finally
1872 * invoked following the close of the current event. In other
1873 * words, if the event_trigger_ops @func() probe implementation
1874 * itself logs to the trace buffer, this flag should be set,
1875 * otherwise it can be left unspecified.
1877 * @NEEDS_REC: A flag that says whether or not this command needs
1878 * access to the trace record in order to perform its function,
1879 * regardless of whether or not it has a filter associated with
1880 * it (filters make a trigger require access to the trace record
1881 * but are not always present).
1883 enum event_command_flags {
1884 EVENT_CMD_FL_POST_TRIGGER = 1,
1885 EVENT_CMD_FL_NEEDS_REC = 2,
1888 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1890 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1893 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1895 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1898 extern int trace_event_enable_disable(struct trace_event_file *file,
1899 int enable, int soft_disable);
1900 extern int tracing_alloc_snapshot(void);
1901 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1902 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1904 extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1905 extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1907 extern const char *__start___trace_bprintk_fmt[];
1908 extern const char *__stop___trace_bprintk_fmt[];
1910 extern const char *__start___tracepoint_str[];
1911 extern const char *__stop___tracepoint_str[];
1913 void trace_printk_control(bool enabled);
1914 void trace_printk_start_comm(void);
1915 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1916 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1918 /* Used from boot time tracer */
1919 extern int trace_set_options(struct trace_array *tr, char *option);
1920 extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
1921 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
1922 unsigned long size, int cpu_id);
1923 extern int tracing_set_cpumask(struct trace_array *tr,
1924 cpumask_var_t tracing_cpumask_new);
1927 #define MAX_EVENT_NAME_LEN 64
1929 extern int trace_run_command(const char *buf, int (*createfn)(int, char**));
1930 extern ssize_t trace_parse_run_command(struct file *file,
1931 const char __user *buffer, size_t count, loff_t *ppos,
1932 int (*createfn)(int, char**));
1934 extern unsigned int err_pos(char *cmd, const char *str);
1935 extern void tracing_log_err(struct trace_array *tr,
1936 const char *loc, const char *cmd,
1937 const char **errs, u8 type, u8 pos);
1940 * Normal trace_printk() and friends allocates special buffers
1941 * to do the manipulation, as well as saves the print formats
1942 * into sections to display. But the trace infrastructure wants
1943 * to use these without the added overhead at the price of being
1944 * a bit slower (used mainly for warnings, where we don't care
1945 * about performance). The internal_trace_puts() is for such
1948 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1951 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
1952 extern struct trace_event_call \
1953 __aligned(4) event_##call;
1954 #undef FTRACE_ENTRY_DUP
1955 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1956 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1958 #undef FTRACE_ENTRY_PACKED
1959 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \
1960 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1963 #include "trace_entries.h"
1965 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1966 int perf_ftrace_event_register(struct trace_event_call *call,
1967 enum trace_reg type, void *data);
1969 #define perf_ftrace_event_register NULL
1972 #ifdef CONFIG_FTRACE_SYSCALLS
1973 void init_ftrace_syscalls(void);
1974 const char *get_syscall_name(int syscall);
1976 static inline void init_ftrace_syscalls(void) { }
1977 static inline const char *get_syscall_name(int syscall)
1983 #ifdef CONFIG_EVENT_TRACING
1984 void trace_event_init(void);
1985 void trace_event_eval_update(struct trace_eval_map **map, int len);
1986 /* Used from boot time tracer */
1987 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
1988 extern int trigger_process_regex(struct trace_event_file *file, char *buff);
1990 static inline void __init trace_event_init(void) { }
1991 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1994 #ifdef CONFIG_TRACER_SNAPSHOT
1995 void tracing_snapshot_instance(struct trace_array *tr);
1996 int tracing_alloc_snapshot_instance(struct trace_array *tr);
1998 static inline void tracing_snapshot_instance(struct trace_array *tr) { }
1999 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
2005 #ifdef CONFIG_PREEMPT_TRACER
2006 void tracer_preempt_on(unsigned long a0, unsigned long a1);
2007 void tracer_preempt_off(unsigned long a0, unsigned long a1);
2009 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
2010 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
2012 #ifdef CONFIG_IRQSOFF_TRACER
2013 void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
2014 void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
2016 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
2017 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
2020 extern struct trace_iterator *tracepoint_print_iter;
2023 * Reset the state of the trace_iterator so that it can read consumed data.
2024 * Normally, the trace_iterator is used for reading the data when it is not
2025 * consumed, and must retain state.
2027 static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
2029 const size_t offset = offsetof(struct trace_iterator, seq);
2032 * Keep gcc from complaining about overwriting more than just one
2033 * member in the structure.
2035 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
2040 #endif /* _LINUX_KERNEL_TRACE_H */