linux - kernel/trace/trace.h

2511 lines · 80.1 KiB

1	// SPDX-License-Identifier: GPL-2.0
2
3	#ifndef _LINUX_KERNEL_TRACE_H
4	#define _LINUX_KERNEL_TRACE_H
5
6	#include <linux/fs.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>
22	#include <linux/ctype.h>
23	#include <linux/once_lite.h>
24	#include <linux/ftrace_regs.h>
25	#include <linux/llist.h>
26
27	#include "pid_list.h"
28
29	#ifdef CONFIG_FTRACE_SYSCALLS
30	#include <asm/unistd.h> /* For NR_syscalls */
31	#include <asm/syscall.h> /* some archs define it here */
32	#endif
33
34	#define TRACE_MODE_WRITE 0640
35	#define TRACE_MODE_READ 0440
36
37	enum trace_type {
38	__TRACE_FIRST_TYPE = 0,
39
40	TRACE_FN,
41	TRACE_CTX,
42	TRACE_WAKE,
43	TRACE_STACK,
44	TRACE_PRINT,
45	TRACE_BPRINT,
46	TRACE_MMIO_RW,
47	TRACE_MMIO_MAP,
48	TRACE_BRANCH,
49	TRACE_GRAPH_RET,
50	TRACE_GRAPH_ENT,
51	TRACE_GRAPH_RETADDR_ENT,
52	TRACE_USER_STACK,
53	TRACE_BLK,
54	TRACE_BPUTS,
55	TRACE_HWLAT,
56	TRACE_OSNOISE,
57	TRACE_TIMERLAT,
58	TRACE_RAW_DATA,
59	TRACE_FUNC_REPEATS,
60
61	__TRACE_LAST_TYPE,
62	};
63
64
65	#undef __field
66	#define __field(type, item) type item;
67
68	#undef __field_fn
69	#define __field_fn(type, item) type item;
70
71	#undef __field_packed
72	#define __field_packed(type, item) type item;
73
74	#undef __field_struct
75	#define __field_struct(type, item) __field(type, item)
76
77	#undef __field_desc
78	#define __field_desc(type, container, item)
79
80	#undef __field_desc_packed
81	#define __field_desc_packed(type, container, item)
82
83	#undef __array
84	#define __array(type, item, size) type item[size];
85
86	/*
87	* For backward compatibility, older user space expects to see the
88	* kernel_stack event with a fixed size caller field. But today the fix
89	* size is ignored by the kernel, and the real structure is dynamic.
90	* Expose to user space: "unsigned long caller[8];" but the real structure
91	* will be "unsigned long caller[] __counted_by(size)"
92	*/
93	#undef __stack_array
94	#define __stack_array(type, item, size, field) type item[] __counted_by(field);
95
96	#undef __array_desc
97	#define __array_desc(type, container, item, size)
98
99	#undef __dynamic_array
100	#define __dynamic_array(type, item) type item[];
101
102	#undef __rel_dynamic_array
103	#define __rel_dynamic_array(type, item) type item[];
104
105	#undef F_STRUCT
106	#define F_STRUCT(args...) args
107
108	#undef FTRACE_ENTRY
109	#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
110	struct struct_name { \
111	struct trace_entry ent; \
112	tstruct \
113	}
114
115	#undef FTRACE_ENTRY_DUP
116	#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
117
118	#undef FTRACE_ENTRY_REG
119	#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
120	FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
121
122	#undef FTRACE_ENTRY_PACKED
123	#define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \
124	FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed
125
126	#include "trace_entries.h"
127
128	/* Use this for memory failure errors */
129	#define MEM_FAIL(condition, fmt, ...) \
130	DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__)
131
132	#define FAULT_STRING "(fault)"
133
134	#define HIST_STACKTRACE_DEPTH 31
135	#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
136	#define HIST_STACKTRACE_SKIP 5
137
138	#define SYSCALL_FAULT_USER_MAX 165
139
140	/*
141	* syscalls are special, and need special handling, this is why
142	* they are not included in trace_entries.h
143	*/
144	struct syscall_trace_enter {
145	struct trace_entry ent;
146	int nr;
147	unsigned long args[];
148	};
149
150	struct syscall_trace_exit {
151	struct trace_entry ent;
152	int nr;
153	long ret;
154	};
155
156	struct kprobe_trace_entry_head {
157	struct trace_entry ent;
158	unsigned long ip;
159	};
160
161	struct eprobe_trace_entry_head {
162	struct trace_entry ent;
163	};
164
165	struct kretprobe_trace_entry_head {
166	struct trace_entry ent;
167	unsigned long func;
168	unsigned long ret_ip;
169	};
170
171	struct fentry_trace_entry_head {
172	struct trace_entry ent;
173	unsigned long ip;
174	};
175
176	struct fexit_trace_entry_head {
177	struct trace_entry ent;
178	unsigned long func;
179	unsigned long ret_ip;
180	};
181
182	#define TRACE_BUF_SIZE 1024
183
184	struct trace_array;
185
186	/*
187	* The CPU trace array - it consists of thousands of trace entries
188	* plus some other descriptor data: (for example which task started
189	* the trace, etc.)
190	*/
191	struct trace_array_cpu {
192	local_t disabled;
193
194	unsigned long entries;
195	unsigned long saved_latency;
196	unsigned long critical_start;
197	unsigned long critical_end;
198	unsigned long critical_sequence;
199	unsigned long nice;
200	unsigned long policy;
201	unsigned long rt_priority;
202	unsigned long skipped_entries;
203	u64 preempt_timestamp;
204	pid_t pid;
205	kuid_t uid;
206	char comm[TASK_COMM_LEN];
207
208	#ifdef CONFIG_FUNCTION_TRACER
209	int ftrace_ignore_pid;
210	#endif
211	bool ignore_pid;
212	};
213
214	struct tracer;
215	struct trace_option_dentry;
216
217	struct array_buffer {
218	struct trace_array *tr;
219	struct trace_buffer *buffer;
220	struct trace_array_cpu __percpu *data;
221	u64 time_start;
222	int cpu;
223	};
224
225	#define TRACE_FLAGS_MAX_SIZE 64
226
227	struct trace_options {
228	struct tracer *tracer;
229	struct trace_option_dentry *topts;
230	int nr_topts;
231	};
232
233	struct trace_pid_list *trace_pid_list_alloc(void);
234	void trace_pid_list_free(struct trace_pid_list *pid_list);
235	bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid);
236	int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid);
237	int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid);
238	int trace_pid_list_first(struct trace_pid_list pid_list, unsigned int pid);
239	int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid,
240	unsigned int *next);
241
242	enum {
243	TRACE_PIDS = BIT(0),
244	TRACE_NO_PIDS = BIT(1),
245	};
246
247	static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list,
248	struct trace_pid_list *no_pid_list)
249	{
250	/* Return true if the pid list in type has pids */
251	return ((type & TRACE_PIDS) && pid_list) \|\|
252	((type & TRACE_NO_PIDS) && no_pid_list);
253	}
254
255	static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list,
256	struct trace_pid_list *no_pid_list)
257	{
258	/*
259	* Turning off what is in @type, return true if the "other"
260	* pid list, still has pids in it.
261	*/
262	return (!(type & TRACE_PIDS) && pid_list) \|\|
263	(!(type & TRACE_NO_PIDS) && no_pid_list);
264	}
265
266	typedef bool (cond_update_fn_t)(struct trace_array tr, void *cond_data);
267
268	#ifdef CONFIG_TRACER_SNAPSHOT
269	/**
270	* struct cond_snapshot - conditional snapshot data and callback
271	*
272	* The cond_snapshot structure encapsulates a callback function and
273	* data associated with the snapshot for a given tracing instance.
274	*
275	* When a snapshot is taken conditionally, by invoking
276	* tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
277	* passed in turn to the cond_snapshot.update() function. That data
278	* can be compared by the update() implementation with the cond_data
279	* contained within the struct cond_snapshot instance associated with
280	* the trace_array. Because the tr->max_lock is held throughout the
281	* update() call, the update() function can directly retrieve the
282	* cond_snapshot and cond_data associated with the per-instance
283	* snapshot associated with the trace_array.
284	*
285	* The cond_snapshot.update() implementation can save data to be
286	* associated with the snapshot if it decides to, and returns 'true'
287	* in that case, or it returns 'false' if the conditional snapshot
288	* shouldn't be taken.
289	*
290	* The cond_snapshot instance is created and associated with the
291	* user-defined cond_data by tracing_cond_snapshot_enable().
292	* Likewise, the cond_snapshot instance is destroyed and is no longer
293	* associated with the trace instance by
294	* tracing_cond_snapshot_disable().
295	*
296	* The method below is required.
297	*
298	* @update: When a conditional snapshot is invoked, the update()
299	* callback function is invoked with the tr->max_lock held. The
300	* update() implementation signals whether or not to actually
301	* take the snapshot, by returning 'true' if so, 'false' if no
302	* snapshot should be taken. Because the max_lock is held for
303	* the duration of update(), the implementation is safe to
304	* directly retrieved and save any implementation data it needs
305	* to in association with the snapshot.
306	*/
307	struct cond_snapshot {
308	void *cond_data;
309	cond_update_fn_t update;
310	};
311	#endif /* CONFIG_TRACER_SNAPSHOT */
312
313	/*
314	* struct trace_func_repeats - used to keep track of the consecutive
315	* (on the same CPU) calls of a single function.
316	*/
317	struct trace_func_repeats {
318	unsigned long ip;
319	unsigned long parent_ip;
320	unsigned long count;
321	u64 ts_last_call;
322	};
323
324	struct trace_module_delta {
325	struct rcu_head rcu;
326	long delta[];
327	};
328
329	/*
330	* The trace array - an array of per-CPU trace arrays. This is the
331	* highest level data structure that individual tracers deal with.
332	* They have on/off state as well:
333	*/
334	struct trace_array {
335	struct list_head list;
336	char *name;
337	struct array_buffer array_buffer;
338	#ifdef CONFIG_TRACER_SNAPSHOT
339	/*
340	* The snapshot_buffer is used to snapshot the trace when a maximum
341	* latency is reached, or when the user initiates a snapshot.
342	* Some tracers will use this to store a maximum trace while
343	* it continues examining live traces.
344	*
345	* The buffers for the snapshot_buffer are set up the same as the
346	* array_buffer. When a snapshot is taken, the buffer of the
347	* snapshot_buffer is swapped with the buffer of the array_buffer
348	* and the buffers are reset for the array_buffer so the tracing can
349	* continue.
350	*/
351	struct array_buffer snapshot_buffer;
352	bool allocated_snapshot;
353	spinlock_t snapshot_trigger_lock;
354	unsigned int snapshot;
355	#ifdef CONFIG_TRACER_MAX_TRACE
356	unsigned long max_latency;
357	struct dentry *d_max_latency;
358	#ifdef CONFIG_FSNOTIFY
359	struct work_struct fsnotify_work;
360	struct irq_work fsnotify_irqwork;
361	#endif /* CONFIG_FSNOTIFY */
362	#endif /* CONFIG_TRACER_MAX_TRACE */
363	#endif /* CONFIG_TRACER_SNAPSHOT */
364
365	/* The below is for memory mapped ring buffer */
366	unsigned int mapped;
367	unsigned long range_addr_start;
368	unsigned long range_addr_size;
369	char *range_name;
370	long text_delta;
371	struct trace_module_delta *module_delta;
372	void scratch; / pointer in persistent memory */
373	int scratch_size;
374
375	int buffer_disabled;
376
377	struct trace_pid_list __rcu *filtered_pids;
378	struct trace_pid_list __rcu *filtered_no_pids;
379	/*
380	* max_lock is used to protect the swapping of buffers
381	* when taking a max snapshot. The buffers themselves are
382	* protected by per_cpu spinlocks. But the action of the swap
383	* needs its own lock.
384	*
385	* This is defined as a arch_spinlock_t in order to help
386	* with performance when lockdep debugging is enabled.
387	*
388	* It is also used in other places outside the update_max_tr
389	* so it needs to be defined outside of the
390	* CONFIG_TRACER_SNAPSHOT.
391	*/
392	arch_spinlock_t max_lock;
393	#ifdef CONFIG_FTRACE_SYSCALLS
394	int sys_refcount_enter;
395	int sys_refcount_exit;
396	struct trace_event_file *enter_syscall_files[NR_syscalls];
397	struct trace_event_file *exit_syscall_files[NR_syscalls];
398	#endif
399	int stop_count;
400	int clock_id;
401	int nr_topts;
402	bool clear_trace;
403	int buffer_percent;
404	unsigned int n_err_log_entries;
405	struct tracer *current_trace;
406	struct tracer_flags *current_trace_flags;
407	u64 trace_flags;
408	unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
409	unsigned int flags;
410	raw_spinlock_t start_lock;
411	union {
412	const char *system_names;
413	char *boot_events;
414	};
415	struct list_head err_log;
416	struct dentry *dir;
417	struct dentry *options;
418	struct dentry *percpu_dir;
419	struct eventfs_inode *event_dir;
420	struct trace_options *topts;
421	struct list_head systems;
422	struct list_head events;
423	struct list_head marker_list;
424	struct list_head tracers;
425	struct trace_event_file *trace_marker_file;
426	cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
427	/* one per_cpu trace_pipe can be opened by only one user */
428	cpumask_var_t pipe_cpumask;
429	int ref;
430	int trace_ref;
431	#ifdef CONFIG_MODULES
432	struct list_head mod_events;
433	#endif
434	#ifdef CONFIG_FUNCTION_TRACER
435	struct ftrace_ops *ops;
436	struct trace_pid_list __rcu *function_pids;
437	struct trace_pid_list __rcu *function_no_pids;
438	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
439	struct fgraph_ops *gops;
440	#endif
441	#ifdef CONFIG_DYNAMIC_FTRACE
442	/* All of these are protected by the ftrace_lock */
443	struct list_head func_probes;
444	struct list_head mod_trace;
445	struct list_head mod_notrace;
446	#endif
447	/* function tracing enabled */
448	int function_enabled;
449	#endif
450	int no_filter_buffering_ref;
451	unsigned int syscall_buf_sz;
452	struct list_head hist_vars;
453	#ifdef CONFIG_TRACER_SNAPSHOT
454	struct cond_snapshot *cond_snapshot;
455	#endif
456	struct trace_func_repeats __percpu *last_func_repeats;
457	/*
458	* On boot up, the ring buffer is set to the minimum size, so that
459	* we do not waste memory on systems that are not using tracing.
460	*/
461	bool ring_buffer_expanded;
462	/*
463	* If the ring buffer is a read only backup instance, it will be
464	* removed after dumping all data via pipe, because no readable data.
465	*/
466	bool free_on_close;
467	struct work_struct autoremove_work;
468	};
469
470	enum {
471	TRACE_ARRAY_FL_GLOBAL = BIT(0),
472	TRACE_ARRAY_FL_BOOT = BIT(1),
473	TRACE_ARRAY_FL_LAST_BOOT = BIT(2),
474	TRACE_ARRAY_FL_MOD_INIT = BIT(3),
475	TRACE_ARRAY_FL_MEMMAP = BIT(4),
476	TRACE_ARRAY_FL_VMALLOC = BIT(5),
477	TRACE_ARRAY_FL_RDONLY = BIT(6),
478	};
479
480	#ifdef CONFIG_MODULES
481	bool module_exists(const char *module);
482	#else
483	static inline bool module_exists(const char *module)
484	{
485	return false;
486	}
487	#endif
488
489	extern struct list_head ftrace_trace_arrays;
490
491	extern struct mutex trace_types_lock;
492
493	extern int trace_array_get(struct trace_array *tr);
494	extern int tracing_check_open_get_tr(struct trace_array *tr);
495	extern struct trace_array trace_array_find(const char instance);
496	extern struct trace_array trace_array_find_get(const char instance);
497
498	extern u64 tracing_event_time_stamp(struct trace_buffer buffer, struct ring_buffer_event rbe);
499	extern int tracing_set_clock(struct trace_array tr, const char clockstr);
500
501	extern bool trace_clock_in_ns(struct trace_array *tr);
502
503	extern unsigned long trace_adjust_address(struct trace_array *tr, unsigned long addr);
504
505	extern struct trace_array *printk_trace;
506
507	static inline bool trace_array_is_readonly(struct trace_array *tr)
508	{
509	/* backup instance is read only. */
510	return tr->flags & TRACE_ARRAY_FL_RDONLY;
511	}
512
513	/*
514	* The global tracer (top) should be the first trace array added,
515	* but we check the flag anyway.
516	*/
517	static inline struct trace_array *top_trace_array(void)
518	{
519	struct trace_array *tr;
520
521	if (list_empty(&ftrace_trace_arrays))
522	return NULL;
523
524	tr = list_entry(ftrace_trace_arrays.prev,
525	typeof(*tr), list);
526	WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
527	return tr;
528	}
529
530	#define FTRACE_CMP_TYPE(var, type) \
531	__builtin_types_compatible_p(typeof(var), type *)
532
533	#undef IF_ASSIGN
534	#define IF_ASSIGN(var, entry, etype, id) \
535	if (FTRACE_CMP_TYPE(var, etype)) { \
536	var = (typeof(var))(entry); \
537	WARN_ON(id != 0 && (entry)->type != id); \
538	break; \
539	}
540
541	/* Will cause compile errors if type is not found. */
542	extern void __ftrace_bad_type(void);
543
544	/*
545	* The trace_assign_type is a verifier that the entry type is
546	* the same as the type being assigned. To add new types simply
547	* add a line with the following format:
548	*
549	* IF_ASSIGN(var, ent, type, id);
550	*
551	* Where "type" is the trace type that includes the trace_entry
552	* as the "ent" item. And "id" is the trace identifier that is
553	* used in the trace_type enum.
554	*
555	* If the type can have more than one id, then use zero.
556	*/
557	#define trace_assign_type(var, ent) \
558	do { \
559	IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
560	IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
561	IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
562	IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
563	IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
564	IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
565	IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
566	IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
567	IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\
568	IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\
569	IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
570	IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
571	TRACE_MMIO_RW); \
572	IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
573	TRACE_MMIO_MAP); \
574	IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
575	IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
576	TRACE_GRAPH_ENT); \
577	IF_ASSIGN(var, ent, struct fgraph_retaddr_ent_entry,\
578	TRACE_GRAPH_RETADDR_ENT); \
579	IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
580	TRACE_GRAPH_RET); \
581	IF_ASSIGN(var, ent, struct func_repeats_entry, \
582	TRACE_FUNC_REPEATS); \
583	__ftrace_bad_type(); \
584	} while (0)
585
586	/*
587	* An option specific to a tracer. This is a boolean value.
588	* The bit is the bit index that sets its value on the
589	* flags value in struct tracer_flags.
590	*/
591	struct tracer_opt {
592	const char name; / Will appear on the trace_options file */
593	u32 bit; /* Mask assigned in val field in tracer_flags */
594	};
595
596	/*
597	* The set of specific options for a tracer. Your tracer
598	* have to set the initial value of the flags val.
599	*/
600	struct tracer_flags {
601	u32 val;
602	struct tracer_opt *opts;
603	struct tracer *trace;
604	};
605
606	/* Makes more easy to define a tracer opt */
607	#define TRACER_OPT(s, b) .name = #s, .bit = b
608
609
610	struct trace_option_dentry {
611	struct tracer_opt *opt;
612	struct tracer_flags *flags;
613	struct trace_array *tr;
614	struct dentry *entry;
615	};
616
617	/**
618	* struct tracer - a specific tracer and its callbacks to interact with tracefs
619	* @name: the name chosen to select it on the available_tracers file
620	* @init: called when one switches to this tracer (echo name > current_tracer)
621	* @reset: called when one switches to another tracer
622	* @start: called when tracing is unpaused (echo 1 > tracing_on)
623	* @stop: called when tracing is paused (echo 0 > tracing_on)
624	* @update_thresh: called when tracing_thresh is updated
625	* @open: called when the trace file is opened
626	* @pipe_open: called when the trace_pipe file is opened
627	* @close: called when the trace file is released
628	* @pipe_close: called when the trace_pipe file is released
629	* @read: override the default read callback on trace_pipe
630	* @splice_read: override the default splice_read callback on trace_pipe
631	* @selftest: selftest to run on boot (see trace_selftest.c)
632	* @print_headers: override the first lines that describe your columns
633	* @print_line: callback that prints a trace
634	* @set_flag: signals one of your private flags changed (trace_options file)
635	* @flags: your private flags
636	*/
637	struct tracer {
638	const char *name;
639	int (init)(struct trace_array tr);
640	void (reset)(struct trace_array tr);
641	void (start)(struct trace_array tr);
642	void (stop)(struct trace_array tr);
643	int (update_thresh)(struct trace_array tr);
644	void (open)(struct trace_iterator iter);
645	void (pipe_open)(struct trace_iterator iter);
646	void (close)(struct trace_iterator iter);
647	void (pipe_close)(struct trace_iterator iter);
648	ssize_t (read)(struct trace_iterator iter,
649	struct file filp, char __user ubuf,
650	size_t cnt, loff_t *ppos);
651	ssize_t (splice_read)(struct trace_iterator iter,
652	struct file *filp,
653	loff_t *ppos,
654	struct pipe_inode_info *pipe,
655	size_t len,
656	unsigned int flags);
657	#ifdef CONFIG_FTRACE_STARTUP_TEST
658	int (selftest)(struct tracer trace,
659	struct trace_array *tr);
660	#endif
661	void (print_header)(struct seq_file m);
662	enum print_line_t (print_line)(struct trace_iterator iter);
663	/* If you handled the flag setting, return 0 */
664	int (set_flag)(struct trace_array tr,
665	u32 old_flags, u32 bit, int set);
666	/* Return 0 if OK with change, else return non-zero */
667	int (flag_changed)(struct trace_array tr,
668	u64 mask, int set);
669	struct tracer *next;
670	struct tracer_flags *flags;
671	struct tracer_flags *default_flags;
672	int enabled;
673	bool print_max;
674	bool allow_instances;
675	#ifdef CONFIG_TRACER_MAX_TRACE
676	bool use_max_tr;
677	#endif
678	/* True if tracer cannot be enabled in kernel param */
679	bool noboot;
680	};
681
682	static inline struct ring_buffer_iter *
683	trace_buffer_iter(struct trace_iterator *iter, int cpu)
684	{
685	return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
686	}
687
688	extern int tracing_disabled;
689
690	int tracer_init(struct tracer t, struct trace_array tr);
691	int tracing_is_enabled(void);
692	void tracing_reset_online_cpus(struct array_buffer *buf);
693	void tracing_reset_all_online_cpus(void);
694	void tracing_reset_all_online_cpus_unlocked(void);
695	int tracing_open_generic(struct inode inode, struct file filp);
696	int tracing_open_generic_tr(struct inode inode, struct file filp);
697	int tracing_release(struct inode inode, struct file file);
698	int tracing_release_generic_tr(struct inode inode, struct file file);
699	int tracing_open_file_tr(struct inode inode, struct file filp);
700	int tracing_release_file_tr(struct inode inode, struct file filp);
701	int tracing_single_release_file_tr(struct inode inode, struct file filp);
702	bool tracer_tracing_is_on(struct trace_array *tr);
703	void tracer_tracing_on(struct trace_array *tr);
704	void tracer_tracing_off(struct trace_array *tr);
705	void tracer_tracing_disable(struct trace_array *tr);
706	void tracer_tracing_enable(struct trace_array *tr);
707	int allocate_trace_buffer(struct trace_array tr, struct array_buffer buf, int size);
708	struct dentry trace_create_file(const char name,
709	umode_t mode,
710	struct dentry *parent,
711	void *data,
712	const struct file_operations *fops);
713	struct dentry trace_create_cpu_file(const char name,
714	umode_t mode,
715	struct dentry *parent,
716	void *data,
717	long cpu,
718	const struct file_operations *fops);
719
720	struct trace_iterator __tracing_open(struct inode inode, struct file *file,
721	bool snapshot);
722	int tracing_buffers_open(struct inode inode, struct file filp);
723	ssize_t tracing_buffers_read(struct file filp, char __user ubuf,
724	size_t count, loff_t *ppos);
725	int tracing_buffers_release(struct inode inode, struct file file);
726	ssize_t tracing_buffers_splice_read(struct file file, loff_t ppos,
727	struct pipe_inode_info *pipe, size_t len, unsigned int flags);
728
729	ssize_t tracing_nsecs_read(unsigned long ptr, char __user ubuf,
730	size_t cnt, loff_t *ppos);
731	ssize_t tracing_nsecs_write(unsigned long ptr, const char __user ubuf,
732	size_t cnt, loff_t *ppos);
733
734	void trace_set_buffer_entries(struct array_buffer *buf, unsigned long val);
735
736	/*
737	* Should be used after trace_array_get(), trace_types_lock
738	* ensures that i_cdev was already initialized.
739	*/
740	static inline int tracing_get_cpu(struct inode *inode)
741	{
742	if (inode->i_cdev) /* See trace_create_cpu_file() */
743	return (long)inode->i_cdev - 1;
744	return RING_BUFFER_ALL_CPUS;
745	}
746	void tracing_reset_cpu(struct array_buffer *buf, int cpu);
747
748	struct ftrace_buffer_info {
749	struct trace_iterator iter;
750	struct buffer_data_read_page *spare;
751	unsigned int spare_cpu;
752	unsigned int read;
753	};
754
755	/**
756	* tracer_tracing_is_on_cpu - show real state of ring buffer enabled on for a cpu
757	* @tr : the trace array to know if ring buffer is enabled
758	* @cpu: The cpu buffer to check if enabled
759	*
760	* Shows real state of the per CPU buffer if it is enabled or not.
761	*/
762	static inline bool tracer_tracing_is_on_cpu(struct trace_array *tr, int cpu)
763	{
764	if (tr->array_buffer.buffer)
765	return ring_buffer_record_is_on_cpu(tr->array_buffer.buffer, cpu);
766	return false;
767	}
768
769	int tracing_init_dentry(void);
770
771	struct ring_buffer_event;
772
773	struct ring_buffer_event *
774	trace_buffer_lock_reserve(struct trace_buffer *buffer,
775	int type,
776	unsigned long len,
777	unsigned int trace_ctx);
778
779	int ring_buffer_meta_seq_init(struct file file, struct trace_buffer buffer, int cpu);
780
781	struct trace_entry tracing_get_trace_entry(struct trace_array tr,
782	struct trace_array_cpu *data);
783
784	struct trace_entry trace_find_next_entry(struct trace_iterator iter,
785	int ent_cpu, u64 ent_ts);
786
787	void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
788	struct ring_buffer_event *event);
789
790	bool trace_is_tracepoint_string(const char *str);
791	const char trace_event_format(struct trace_iterator iter, const char *fmt);
792	char trace_iter_expand_format(struct trace_iterator iter);
793	bool ignore_event(struct trace_iterator *iter);
794
795	int trace_empty(struct trace_iterator *iter);
796
797	void trace_find_next_entry_inc(struct trace_iterator iter);
798
799	void trace_init_global_iter(struct trace_iterator *iter);
800
801	void tracing_iter_reset(struct trace_iterator *iter, int cpu);
802
803	unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
804	unsigned long trace_total_entries(struct trace_array *tr);
805
806	void trace_function(struct trace_array *tr,
807	unsigned long ip,
808	unsigned long parent_ip,
809	unsigned int trace_ctx,
810	struct ftrace_regs *regs);
811	void trace_graph_function(struct trace_array *tr,
812	unsigned long ip,
813	unsigned long parent_ip,
814	unsigned int trace_ctx);
815	void trace_latency_header(struct seq_file *m);
816	void trace_default_header(struct seq_file *m);
817	void print_trace_header(struct seq_file m, struct trace_iterator iter);
818
819	void trace_graph_return(struct ftrace_graph_ret trace, struct fgraph_ops gops,
820	struct ftrace_regs *fregs);
821	int trace_graph_entry(struct ftrace_graph_ent trace, struct fgraph_ops gops,
822	struct ftrace_regs *fregs);
823
824	void tracing_start_cmdline_record(void);
825	void tracing_stop_cmdline_record(void);
826	void tracing_start_tgid_record(void);
827	void tracing_stop_tgid_record(void);
828
829	int register_tracer(struct tracer *type);
830	int is_tracing_stopped(void);
831
832	loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
833
834	extern cpumask_var_t __read_mostly tracing_buffer_mask;
835
836	#define for_each_tracing_cpu(cpu) \
837	for_each_cpu(cpu, tracing_buffer_mask)
838
839	extern unsigned long nsecs_to_usecs(unsigned long nsecs);
840
841	extern unsigned long tracing_thresh;
842	extern struct workqueue_struct *trace_init_wq __initdata;
843
844	/* PID filtering */
845
846	bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
847	pid_t search_pid);
848	bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
849	struct trace_pid_list *filtered_no_pids,
850	struct task_struct *task);
851	void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
852	struct task_struct *self,
853	struct task_struct *task);
854	void trace_pid_next(struct trace_pid_list pid_list, void v, loff_t pos);
855	void trace_pid_start(struct trace_pid_list pid_list, loff_t *pos);
856	int trace_pid_show(struct seq_file m, void v);
857	int trace_pid_write(struct trace_pid_list *filtered_pids,
858	struct trace_pid_list **new_pid_list,
859	const char __user *ubuf, size_t cnt);
860
861	#ifdef CONFIG_TRACER_SNAPSHOT
862	void update_max_tr(struct trace_array tr, struct task_struct tsk, int cpu,
863	void *cond_data);
864	void update_max_tr_single(struct trace_array *tr,
865	struct task_struct *tsk, int cpu);
866
867	#if defined(CONFIG_TRACER_MAX_TRACE) && defined(CONFIG_FSNOTIFY)
868	# define LATENCY_FS_NOTIFY
869	#endif
870	#endif /* CONFIG_TRACER_SNAPSHOT */
871
872	#ifdef LATENCY_FS_NOTIFY
873	void latency_fsnotify(struct trace_array *tr);
874	#else
875	static inline void latency_fsnotify(struct trace_array *tr) { }
876	#endif
877
878	#ifdef CONFIG_STACKTRACE
879	void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip);
880	#else
881	static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
882	int skip)
883	{
884	}
885	#endif /* CONFIG_STACKTRACE */
886
887	#ifdef CONFIG_TRACER_MAX_TRACE
888	static inline bool tracer_uses_snapshot(struct tracer *tracer)
889	{
890	return tracer->use_max_tr;
891	}
892	void trace_create_maxlat_file(struct trace_array *tr,
893	struct dentry *d_tracer);
894	#else
895	static inline bool tracer_uses_snapshot(struct tracer *tracer)
896	{
897	return false;
898	}
899	static inline void trace_create_maxlat_file(struct trace_array *tr,
900	struct dentry *d_tracer) { }
901	#endif
902
903	void trace_last_func_repeats(struct trace_array *tr,
904	struct trace_func_repeats *last_info,
905	unsigned int trace_ctx);
906
907	extern u64 ftrace_now(int cpu);
908
909	extern void trace_find_cmdline(int pid, char comm[]);
910	extern int trace_find_tgid(int pid);
911	extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
912
913	extern int trace_events_enabled(struct trace_array tr, const char system);
914
915	#ifdef CONFIG_DYNAMIC_FTRACE
916	extern unsigned long ftrace_update_tot_cnt;
917	extern unsigned long ftrace_number_of_pages;
918	extern unsigned long ftrace_number_of_groups;
919	extern u64 ftrace_update_time;
920	extern u64 ftrace_total_mod_time;
921	void ftrace_init_trace_array(struct trace_array *tr);
922	#else
923	static inline void ftrace_init_trace_array(struct trace_array *tr) { }
924	#endif
925	#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
926	extern int DYN_FTRACE_TEST_NAME(void);
927	#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
928	extern int DYN_FTRACE_TEST_NAME2(void);
929
930	void __init trace_append_boot_param(char buf, const char str,
931	char sep, int size);
932	extern void trace_set_ring_buffer_expanded(struct trace_array *tr);
933	extern bool tracing_selftest_disabled;
934
935	#ifdef CONFIG_FTRACE_STARTUP_TEST
936	extern void __init disable_tracing_selftest(const char *reason);
937
938	extern int trace_selftest_startup_function(struct tracer *trace,
939	struct trace_array *tr);
940	extern int trace_selftest_startup_function_graph(struct tracer *trace,
941	struct trace_array *tr);
942	extern int trace_selftest_startup_irqsoff(struct tracer *trace,
943	struct trace_array *tr);
944	extern int trace_selftest_startup_preemptoff(struct tracer *trace,
945	struct trace_array *tr);
946	extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
947	struct trace_array *tr);
948	extern int trace_selftest_startup_wakeup(struct tracer *trace,
949	struct trace_array *tr);
950	extern int trace_selftest_startup_nop(struct tracer *trace,
951	struct trace_array *tr);
952	extern int trace_selftest_startup_branch(struct tracer *trace,
953	struct trace_array *tr);
954	extern bool __read_mostly tracing_selftest_running;
955	/*
956	* Tracer data references selftest functions that only occur
957	* on boot up. These can be __init functions. Thus, when selftests
958	* are enabled, then the tracers need to reference __init functions.
959	*/
960	#define __tracer_data __refdata
961	#else
962	static inline void __init disable_tracing_selftest(const char *reason)
963	{
964	}
965	/* Tracers are seldom changed. Optimize when selftests are disabled. */
966	#define __tracer_data __read_mostly
967	#define tracing_selftest_running 0
968	#endif /* CONFIG_FTRACE_STARTUP_TEST */
969
970	extern void head_page(struct trace_array_cpu data);
971	extern unsigned long long ns2usecs(u64 nsec);
972
973	__printf(2, 0)
974	int trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
975	__printf(2, 0)
976	int trace_vprintk(unsigned long ip, const char *fmt, va_list args);
977	__printf(3, 0)
978	int trace_array_vprintk(struct trace_array *tr,
979	unsigned long ip, const char *fmt, va_list args);
980	__printf(3, 4)
981	int trace_array_printk_buf(struct trace_buffer *buffer,
982	unsigned long ip, const char *fmt, ...);
983	void trace_printk_seq(struct trace_seq *s);
984	enum print_line_t print_trace_line(struct trace_iterator *iter);
985
986	extern char trace_find_mark(unsigned long long duration);
987
988	struct ftrace_hash;
989
990	struct ftrace_mod_load {
991	struct list_head list;
992	char *func;
993	char *module;
994	int enable;
995	};
996
997	enum {
998	FTRACE_HASH_FL_MOD = (1 << 0),
999	};
1000
1001	struct ftrace_hash {
1002	unsigned long size_bits;
1003	struct hlist_head *buckets;
1004	unsigned long count;
1005	unsigned long flags;
1006	struct rcu_head rcu;
1007	};
1008
1009	struct ftrace_func_entry *
1010	ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
1011
1012	static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
1013	{
1014	return !hash \|\| !(hash->count \|\| (hash->flags & FTRACE_HASH_FL_MOD));
1015	}
1016
1017	/* Standard output formatting function used for function return traces */
1018	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1019
1020	/* Flag options */
1021	#define TRACE_GRAPH_PRINT_OVERRUN 0x1
1022	#define TRACE_GRAPH_PRINT_CPU 0x2
1023	#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
1024	#define TRACE_GRAPH_PRINT_PROC 0x8
1025	#define TRACE_GRAPH_PRINT_DURATION 0x10
1026	#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
1027	#define TRACE_GRAPH_PRINT_REL_TIME 0x40
1028	#define TRACE_GRAPH_PRINT_IRQS 0x80
1029	#define TRACE_GRAPH_PRINT_TAIL 0x100
1030	#define TRACE_GRAPH_SLEEP_TIME 0x200
1031	#define TRACE_GRAPH_GRAPH_TIME 0x400
1032	#define TRACE_GRAPH_PRINT_RETVAL 0x800
1033	#define TRACE_GRAPH_PRINT_RETVAL_HEX 0x1000
1034	#define TRACE_GRAPH_PRINT_RETADDR 0x2000
1035	#define TRACE_GRAPH_ARGS 0x4000
1036	#define TRACE_GRAPH_PRINT_FILL_SHIFT 28
1037	#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
1038
1039	#ifdef CONFIG_FUNCTION_PROFILER
1040	extern void ftrace_graph_graph_time_control(bool enable);
1041	#else
1042	static inline void ftrace_graph_graph_time_control(bool enable) { }
1043	#endif
1044
1045	extern enum print_line_t
1046	print_graph_function_flags(struct trace_iterator *iter, u32 flags);
1047	extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
1048	extern void
1049	trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
1050	extern void graph_trace_open(struct trace_iterator *iter);
1051	extern void graph_trace_close(struct trace_iterator *iter);
1052	extern int __trace_graph_entry(struct trace_array *tr,
1053	struct ftrace_graph_ent *trace,
1054	unsigned int trace_ctx);
1055	extern int __trace_graph_retaddr_entry(struct trace_array *tr,
1056	struct ftrace_graph_ent *trace,
1057	unsigned int trace_ctx,
1058	unsigned long retaddr,
1059	struct ftrace_regs *fregs);
1060	extern void __trace_graph_return(struct trace_array *tr,
1061	struct ftrace_graph_ret *trace,
1062	unsigned int trace_ctx,
1063	u64 calltime, u64 rettime);
1064
1065	extern void init_array_fgraph_ops(struct trace_array tr, struct ftrace_ops ops);
1066	extern int allocate_fgraph_ops(struct trace_array tr, struct ftrace_ops ops);
1067	extern void free_fgraph_ops(struct trace_array *tr);
1068
1069	enum {
1070	TRACE_GRAPH_FL = 1,
1071
1072	/*
1073	* In the very unlikely case that an interrupt came in
1074	* at a start of graph tracing, and we want to trace
1075	* the function in that interrupt, the depth can be greater
1076	* than zero, because of the preempted start of a previous
1077	* trace. In an even more unlikely case, depth could be 2
1078	* if a softirq interrupted the start of graph tracing,
1079	* followed by an interrupt preempting a start of graph
1080	* tracing in the softirq, and depth can even be 3
1081	* if an NMI came in at the start of an interrupt function
1082	* that preempted a softirq start of a function that
1083	* preempted normal context!!!! Luckily, it can't be
1084	* greater than 3, so the next two bits are a mask
1085	* of what the depth is when we set TRACE_GRAPH_FL
1086	*/
1087
1088	TRACE_GRAPH_DEPTH_START_BIT,
1089	TRACE_GRAPH_DEPTH_END_BIT,
1090
1091	/*
1092	* To implement set_graph_notrace, if this bit is set, we ignore
1093	* function graph tracing of called functions, until the return
1094	* function is called to clear it.
1095	*/
1096	TRACE_GRAPH_NOTRACE_BIT,
1097	};
1098
1099	#define TRACE_GRAPH_NOTRACE (1 << TRACE_GRAPH_NOTRACE_BIT)
1100
1101	static inline unsigned long ftrace_graph_depth(unsigned long *task_var)
1102	{
1103	return (*task_var >> TRACE_GRAPH_DEPTH_START_BIT) & 3;
1104	}
1105
1106	static inline void ftrace_graph_set_depth(unsigned long *task_var, int depth)
1107	{
1108	*task_var &= ~(3 << TRACE_GRAPH_DEPTH_START_BIT);
1109	*task_var \|= (depth & 3) << TRACE_GRAPH_DEPTH_START_BIT;
1110	}
1111
1112	#ifdef CONFIG_DYNAMIC_FTRACE
1113	extern struct ftrace_hash __rcu *ftrace_graph_hash;
1114	extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
1115
1116	static inline int
1117	ftrace_graph_addr(unsigned long task_var, struct ftrace_graph_ent trace)
1118	{
1119	unsigned long addr = trace->func;
1120	int ret = 0;
1121	struct ftrace_hash *hash;
1122
1123	preempt_disable_notrace();
1124
1125	/*
1126	* Have to open code "rcu_dereference_sched()" because the
1127	* function graph tracer can be called when RCU is not
1128	* "watching".
1129	* Protected with schedule_on_each_cpu(ftrace_sync)
1130	*/
1131	hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
1132
1133	if (ftrace_hash_empty(hash)) {
1134	ret = 1;
1135	goto out;
1136	}
1137
1138	if (ftrace_lookup_ip(hash, addr)) {
1139	/*
1140	* This needs to be cleared on the return functions
1141	* when the depth is zero.
1142	*/
1143	*task_var \|= TRACE_GRAPH_FL;
1144	ftrace_graph_set_depth(task_var, trace->depth);
1145
1146	/*
1147	* If no irqs are to be traced, but a set_graph_function
1148	* is set, and called by an interrupt handler, we still
1149	* want to trace it.
1150	*/
1151	if (in_hardirq())
1152	trace_recursion_set(TRACE_IRQ_BIT);
1153	else
1154	trace_recursion_clear(TRACE_IRQ_BIT);
1155	ret = 1;
1156	}
1157
1158	out:
1159	preempt_enable_notrace();
1160	return ret;
1161	}
1162
1163	static inline void
1164	ftrace_graph_addr_finish(struct fgraph_ops gops, struct ftrace_graph_ret trace)
1165	{
1166	unsigned long *task_var = fgraph_get_task_var(gops);
1167
1168	if ((*task_var & TRACE_GRAPH_FL) &&
1169	trace->depth == ftrace_graph_depth(task_var))
1170	*task_var &= ~TRACE_GRAPH_FL;
1171	}
1172
1173	static inline int ftrace_graph_notrace_addr(unsigned long addr)
1174	{
1175	int ret = 0;
1176	struct ftrace_hash *notrace_hash;
1177
1178	preempt_disable_notrace();
1179
1180	/*
1181	* Have to open code "rcu_dereference_sched()" because the
1182	* function graph tracer can be called when RCU is not
1183	* "watching".
1184	* Protected with schedule_on_each_cpu(ftrace_sync)
1185	*/
1186	notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
1187	!preemptible());
1188
1189	if (ftrace_lookup_ip(notrace_hash, addr))
1190	ret = 1;
1191
1192	preempt_enable_notrace();
1193	return ret;
1194	}
1195	#else
1196	static inline int ftrace_graph_addr(unsigned long task_var, struct ftrace_graph_ent trace)
1197	{
1198	return 1;
1199	}
1200
1201	static inline int ftrace_graph_notrace_addr(unsigned long addr)
1202	{
1203	return 0;
1204	}
1205	static inline void ftrace_graph_addr_finish(struct fgraph_ops gops, struct ftrace_graph_ret trace)
1206	{ }
1207	#endif /* CONFIG_DYNAMIC_FTRACE */
1208
1209	extern unsigned int fgraph_max_depth;
1210	extern int fgraph_no_sleep_time;
1211	extern bool fprofile_no_sleep_time;
1212
1213	static inline bool
1214	ftrace_graph_ignore_func(struct fgraph_ops gops, struct ftrace_graph_ent trace)
1215	{
1216	unsigned long *task_var = fgraph_get_task_var(gops);
1217
1218	/* trace it when it is-nested-in or is a function enabled. */
1219	return !((*task_var & TRACE_GRAPH_FL) \|\|
1220	ftrace_graph_addr(task_var, trace)) \|\|
1221	(trace->depth < 0) \|\|
1222	(fgraph_max_depth && trace->depth >= fgraph_max_depth);
1223	}
1224
1225	void fgraph_init_ops(struct ftrace_ops *dst_ops,
1226	struct ftrace_ops *src_ops);
1227
1228	#else /* CONFIG_FUNCTION_GRAPH_TRACER */
1229	static inline enum print_line_t
1230	print_graph_function_flags(struct trace_iterator *iter, u32 flags)
1231	{
1232	return TRACE_TYPE_UNHANDLED;
1233	}
1234	static inline void free_fgraph_ops(struct trace_array *tr) { }
1235	/* ftrace_ops may not be defined */
1236	#define init_array_fgraph_ops(tr, ops) do { } while (0)
1237	#define allocate_fgraph_ops(tr, ops) ({ 0; })
1238	#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
1239
1240	extern struct list_head ftrace_pids;
1241
1242	#ifdef CONFIG_FUNCTION_TRACER
1243
1244	#define FTRACE_PID_IGNORE -1
1245	#define FTRACE_PID_TRACE -2
1246
1247	struct ftrace_func_command {
1248	struct list_head list;
1249	char *name;
1250	int (func)(struct trace_array tr,
1251	struct ftrace_hash *hash,
1252	char func, char cmd,
1253	char *params, int enable);
1254	};
1255	extern bool ftrace_filter_param __initdata;
1256	extern int ftrace_is_dead(void);
1257	int ftrace_create_function_files(struct trace_array *tr,
1258	struct dentry *parent);
1259	void ftrace_destroy_function_files(struct trace_array *tr);
1260	int ftrace_allocate_ftrace_ops(struct trace_array *tr);
1261	void ftrace_free_ftrace_ops(struct trace_array *tr);
1262	void ftrace_init_global_array_ops(struct trace_array *tr);
1263	struct trace_array *trace_get_global_array(void);
1264	void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
1265	void ftrace_reset_array_ops(struct trace_array *tr);
1266	void ftrace_init_tracefs(struct trace_array tr, struct dentry d_tracer);
1267	void ftrace_init_tracefs_toplevel(struct trace_array *tr,
1268	struct dentry *d_tracer);
1269	void ftrace_clear_pids(struct trace_array *tr);
1270	int init_function_trace(void);
1271	void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
1272	#else
1273	static inline int ftrace_is_dead(void) { return 0; }
1274	static inline int
1275	ftrace_create_function_files(struct trace_array *tr,
1276	struct dentry *parent)
1277	{
1278	return 0;
1279	}
1280	static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr)
1281	{
1282	return 0;
1283	}
1284	static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { }
1285	static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1286	static inline __init void
1287	ftrace_init_global_array_ops(struct trace_array *tr) { }
1288	static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1289	static inline void ftrace_init_tracefs(struct trace_array tr, struct dentry d) { }
1290	static inline void ftrace_init_tracefs_toplevel(struct trace_array tr, struct dentry d) { }
1291	static inline void ftrace_clear_pids(struct trace_array *tr) { }
1292	static inline int init_function_trace(void) { return 0; }
1293	static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1294	/* ftace_func_t type is not defined, use macro instead of static inline */
1295	#define ftrace_init_array_ops(tr, func) do { } while (0)
1296	#endif /* CONFIG_FUNCTION_TRACER */
1297
1298	#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1299
1300	struct ftrace_probe_ops {
1301	void (*func)(unsigned long ip,
1302	unsigned long parent_ip,
1303	struct trace_array *tr,
1304	struct ftrace_probe_ops *ops,
1305	void *data);
1306	int (init)(struct ftrace_probe_ops ops,
1307	struct trace_array *tr,
1308	unsigned long ip, void *init_data,
1309	void **data);
1310	void (free)(struct ftrace_probe_ops ops,
1311	struct trace_array *tr,
1312	unsigned long ip, void *data);
1313	int (print)(struct seq_file m,
1314	unsigned long ip,
1315	struct ftrace_probe_ops *ops,
1316	void *data);
1317	};
1318
1319	struct ftrace_func_mapper;
1320	typedef int (ftrace_mapper_func)(void data);
1321
1322	struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1323	void *ftrace_func_mapper_find_ip(struct ftrace_func_mapper mapper,
1324	unsigned long ip);
1325	int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1326	unsigned long ip, void *data);
1327	void ftrace_func_mapper_remove_ip(struct ftrace_func_mapper mapper,
1328	unsigned long ip);
1329	void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1330	ftrace_mapper_func free_func);
1331
1332	extern int
1333	register_ftrace_function_probe(char glob, struct trace_array tr,
1334	struct ftrace_probe_ops ops, void data);
1335	extern int
1336	unregister_ftrace_function_probe_func(char glob, struct trace_array tr,
1337	struct ftrace_probe_ops *ops);
1338	extern void clear_ftrace_function_probes(struct trace_array *tr);
1339
1340	int register_ftrace_command(struct ftrace_func_command *cmd);
1341	int unregister_ftrace_command(struct ftrace_func_command *cmd);
1342
1343	void ftrace_create_filter_files(struct trace_array *tr,
1344	struct dentry *parent);
1345	void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1346
1347	extern int ftrace_set_filter(struct ftrace_ops ops, unsigned char buf,
1348	int len, int reset);
1349	extern int ftrace_set_notrace(struct ftrace_ops ops, unsigned char buf,
1350	int len, int reset);
1351	#else
1352	struct ftrace_func_command;
1353
1354	static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1355	{
1356	return -EINVAL;
1357	}
1358	static inline __init int unregister_ftrace_command(char *cmd_name)
1359	{
1360	return -EINVAL;
1361	}
1362	static inline void clear_ftrace_function_probes(struct trace_array *tr)
1363	{
1364	}
1365
1366	static inline void ftrace_create_filter_files(struct trace_array *tr,
1367	struct dentry *parent) { }
1368	/*
1369	* The ops parameter passed in is usually undefined.
1370	* This must be a macro.
1371	*/
1372	#define ftrace_destroy_filter_files(ops) do { } while (0)
1373	#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1374
1375	bool ftrace_event_is_function(struct trace_event_call *call);
1376
1377	/*
1378	* struct trace_parser - servers for reading the user input separated by spaces
1379	* @cont: set if the input is not complete - no final space char was found
1380	* @buffer: holds the parsed user input
1381	* @idx: user input length
1382	* @size: buffer size
1383	*/
1384	struct trace_parser {
1385	bool cont;
1386	bool fail;
1387	char *buffer;
1388	unsigned idx;
1389	unsigned size;
1390	};
1391
1392	static inline bool trace_parser_loaded(struct trace_parser *parser)
1393	{
1394	return !parser->fail && parser->idx != 0;
1395	}
1396
1397	static inline bool trace_parser_cont(struct trace_parser *parser)
1398	{
1399	return parser->cont;
1400	}
1401
1402	static inline void trace_parser_clear(struct trace_parser *parser)
1403	{
1404	parser->cont = false;
1405	parser->idx = 0;
1406	}
1407
1408	static inline void trace_parser_fail(struct trace_parser *parser)
1409	{
1410	parser->fail = true;
1411	}
1412
1413	extern int trace_parser_get_init(struct trace_parser *parser, int size);
1414	extern void trace_parser_put(struct trace_parser *parser);
1415	extern int trace_get_user(struct trace_parser parser, const char __user ubuf,
1416	size_t cnt, loff_t *ppos);
1417
1418	/*
1419	* Only create function graph options if function graph is configured.
1420	*/
1421	#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1422	# define FGRAPH_FLAGS \
1423	C(DISPLAY_GRAPH, "display-graph"),
1424	#else
1425	# define FGRAPH_FLAGS
1426	#endif
1427
1428	#ifdef CONFIG_BRANCH_TRACER
1429	# define BRANCH_FLAGS \
1430	C(BRANCH, "branch"),
1431	#else
1432	# define BRANCH_FLAGS
1433	#endif
1434
1435	#ifdef CONFIG_FUNCTION_TRACER
1436	# define FUNCTION_FLAGS \
1437	C(FUNCTION, "function-trace"), \
1438	C(FUNC_FORK, "function-fork"),
1439	# define FUNCTION_DEFAULT_FLAGS TRACE_ITER(FUNCTION)
1440	#else
1441	# define FUNCTION_FLAGS
1442	# define FUNCTION_DEFAULT_FLAGS 0UL
1443	# define TRACE_ITER_FUNC_FORK_BIT -1
1444	#endif
1445
1446	#ifdef CONFIG_STACKTRACE
1447	# define STACK_FLAGS \
1448	C(STACKTRACE, "stacktrace"),
1449	#else
1450	# define STACK_FLAGS
1451	#endif
1452
1453	#ifdef CONFIG_FUNCTION_PROFILER
1454	# define PROFILER_FLAGS \
1455	C(PROF_TEXT_OFFSET, "prof-text-offset"),
1456	# ifdef CONFIG_FUNCTION_GRAPH_TRACER
1457	# define FPROFILE_FLAGS \
1458	C(GRAPH_TIME, "graph-time"),
1459	# define FPROFILE_DEFAULT_FLAGS TRACE_ITER(GRAPH_TIME)
1460	# else
1461	# define FPROFILE_FLAGS
1462	# define FPROFILE_DEFAULT_FLAGS 0UL
1463	# endif
1464	#else
1465	# define PROFILER_FLAGS
1466	# define FPROFILE_FLAGS
1467	# define FPROFILE_DEFAULT_FLAGS 0UL
1468	# define TRACE_ITER_PROF_TEXT_OFFSET_BIT -1
1469	#endif
1470
1471	/*
1472	* trace_iterator_flags is an enumeration that defines bit
1473	* positions into trace_flags that controls the output.
1474	*
1475	* NOTE: These bits must match the trace_options array in
1476	* trace.c (this macro guarantees it).
1477	*/
1478	#define TRACE_FLAGS \
1479	C(PRINT_PARENT, "print-parent"), \
1480	C(SYM_OFFSET, "sym-offset"), \
1481	C(SYM_ADDR, "sym-addr"), \
1482	C(VERBOSE, "verbose"), \
1483	C(RAW, "raw"), \
1484	C(HEX, "hex"), \
1485	C(BIN, "bin"), \
1486	C(BLOCK, "block"), \
1487	C(FIELDS, "fields"), \
1488	C(PRINTK, "trace_printk"), \
1489	C(ANNOTATE, "annotate"), \
1490	C(USERSTACKTRACE, "userstacktrace"), \
1491	C(SYM_USEROBJ, "sym-userobj"), \
1492	C(PRINTK_MSGONLY, "printk-msg-only"), \
1493	C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1494	C(LATENCY_FMT, "latency-format"), \
1495	C(RECORD_CMD, "record-cmd"), \
1496	C(RECORD_TGID, "record-tgid"), \
1497	C(OVERWRITE, "overwrite"), \
1498	C(STOP_ON_FREE, "disable_on_free"), \
1499	C(IRQ_INFO, "irq-info"), \
1500	C(MARKERS, "markers"), \
1501	C(EVENT_FORK, "event-fork"), \
1502	C(TRACE_PRINTK, "trace_printk_dest"), \
1503	C(COPY_MARKER, "copy_trace_marker"), \
1504	C(PAUSE_ON_TRACE, "pause-on-trace"), \
1505	C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \
1506	C(BITMASK_LIST, "bitmask-list"), \
1507	FUNCTION_FLAGS \
1508	FGRAPH_FLAGS \
1509	STACK_FLAGS \
1510	BRANCH_FLAGS \
1511	PROFILER_FLAGS \
1512	FPROFILE_FLAGS
1513
1514	/*
1515	* By defining C, we can make TRACE_FLAGS a list of bit names
1516	* that will define the bits for the flag masks.
1517	*/
1518	#undef C
1519	#define C(a, b) TRACE_ITER_##a##_BIT
1520
1521	enum trace_iterator_bits {
1522	TRACE_FLAGS
1523	/* Make sure we don't go more than we have bits for */
1524	TRACE_ITER_LAST_BIT
1525	};
1526
1527	/*
1528	* And use TRACE_ITER(flag) to define the bit masks.
1529	*/
1530	#define TRACE_ITER(flag) \
1531	(TRACE_ITER_##flag##_BIT < 0 ? 0 : 1ULL << (TRACE_ITER_##flag##_BIT))
1532
1533	/*
1534	* TRACE_ITER_SYM_MASK masks the options in trace_flags that
1535	* control the output of kernel symbols.
1536	*/
1537	#define TRACE_ITER_SYM_MASK \
1538	(TRACE_ITER(PRINT_PARENT)\|TRACE_ITER(SYM_OFFSET)\|TRACE_ITER(SYM_ADDR))
1539
1540	extern struct tracer nop_trace;
1541
1542	#ifdef CONFIG_BRANCH_TRACER
1543	extern int enable_branch_tracing(struct trace_array *tr);
1544	extern void disable_branch_tracing(void);
1545	static inline int trace_branch_enable(struct trace_array *tr)
1546	{
1547	if (tr->trace_flags & TRACE_ITER(BRANCH))
1548	return enable_branch_tracing(tr);
1549	return 0;
1550	}
1551	static inline void trace_branch_disable(void)
1552	{
1553	/* due to races, always disable */
1554	disable_branch_tracing();
1555	}
1556	#else
1557	static inline int trace_branch_enable(struct trace_array *tr)
1558	{
1559	return 0;
1560	}
1561	static inline void trace_branch_disable(void)
1562	{
1563	}
1564	#endif /* CONFIG_BRANCH_TRACER */
1565
1566	/* set ring buffers to default size if not already done so */
1567	int tracing_update_buffers(struct trace_array *tr);
1568
1569	union trace_synth_field {
1570	u8 as_u8;
1571	u16 as_u16;
1572	u32 as_u32;
1573	u64 as_u64;
1574	struct trace_dynamic_info as_dynamic;
1575	};
1576
1577	struct ftrace_event_field {
1578	struct list_head link;
1579	const char *name;
1580	const char *type;
1581	int filter_type;
1582	int offset;
1583	int size;
1584	unsigned int is_signed:1;
1585	unsigned int needs_test:1;
1586	int len;
1587	};
1588
1589	struct prog_entry;
1590
1591	struct event_filter {
1592	struct prog_entry __rcu *prog;
1593	char *filter_string;
1594	};
1595
1596	struct event_subsystem {
1597	struct list_head list;
1598	const char *name;
1599	struct event_filter *filter;
1600	int ref_count;
1601	};
1602
1603	struct trace_subsystem_dir {
1604	struct list_head list;
1605	struct event_subsystem *subsystem;
1606	struct trace_array *tr;
1607	struct eventfs_inode *ei;
1608	int ref_count;
1609	int nr_events;
1610	};
1611
1612	void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1613	struct trace_buffer *buffer,
1614	struct ring_buffer_event *event,
1615	unsigned int trcace_ctx,
1616	struct pt_regs *regs);
1617
1618	static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1619	struct trace_buffer *buffer,
1620	struct ring_buffer_event *event,
1621	unsigned int trace_ctx)
1622	{
1623	trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL);
1624	}
1625
1626	DECLARE_PER_CPU(bool, trace_taskinfo_save);
1627	int trace_save_cmdline(struct task_struct *tsk);
1628	int trace_create_savedcmd(void);
1629	int trace_alloc_tgid_map(void);
1630	void trace_free_saved_cmdlines_buffer(void);
1631
1632	extern const struct file_operations tracing_saved_cmdlines_fops;
1633	extern const struct file_operations tracing_saved_tgids_fops;
1634	extern const struct file_operations tracing_saved_cmdlines_size_fops;
1635
1636	DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1637	DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1638	void trace_buffered_event_disable(void);
1639	void trace_buffered_event_enable(void);
1640
1641	void early_enable_events(struct trace_array tr, char buf, bool disable_first);
1642
1643	struct trace_user_buf;
1644	struct trace_user_buf_info {
1645	struct trace_user_buf __percpu *tbuf;
1646	size_t size;
1647	int ref;
1648	};
1649
1650	typedef int (trace_user_buf_copy)(char dst, const char __user *src,
1651	size_t size, void *data);
1652	int trace_user_fault_init(struct trace_user_buf_info *tinfo, size_t size);
1653	int trace_user_fault_get(struct trace_user_buf_info *tinfo);
1654	int trace_user_fault_put(struct trace_user_buf_info *tinfo);
1655	void trace_user_fault_destroy(struct trace_user_buf_info *tinfo);
1656	char trace_user_fault_read(struct trace_user_buf_info tinfo,
1657	const char __user *ptr, size_t size,
1658	trace_user_buf_copy copy_func, void *data);
1659
1660	static __always_inline void
1661	trace_event_setup(struct ring_buffer_event *event,
1662	int type, unsigned int trace_ctx)
1663	{
1664	struct trace_entry *ent = ring_buffer_event_data(event);
1665
1666	tracing_generic_entry_update(ent, type, trace_ctx);
1667	}
1668
1669	static __always_inline struct ring_buffer_event *
1670	__trace_buffer_lock_reserve(struct trace_buffer *buffer,
1671	int type,
1672	unsigned long len,
1673	unsigned int trace_ctx)
1674	{
1675	struct ring_buffer_event *event;
1676
1677	event = ring_buffer_lock_reserve(buffer, len);
1678	if (event != NULL)
1679	trace_event_setup(event, type, trace_ctx);
1680
1681	return event;
1682	}
1683
1684	static __always_inline void
1685	__buffer_unlock_commit(struct trace_buffer buffer, struct ring_buffer_event event)
1686	{
1687	__this_cpu_write(trace_taskinfo_save, true);
1688
1689	/* If this is the temp buffer, we need to commit fully */
1690	if (this_cpu_read(trace_buffered_event) == event) {
1691	/* Length is in event->array[0] */
1692	ring_buffer_write(buffer, event->array[0], &event->array[1]);
1693	/* Release the temp buffer */
1694	this_cpu_dec(trace_buffered_event_cnt);
1695	/* ring_buffer_unlock_commit() enables preemption */
1696	preempt_enable_notrace();
1697	} else
1698	ring_buffer_unlock_commit(buffer);
1699	}
1700
1701	static inline void
1702	__trace_event_discard_commit(struct trace_buffer *buffer,
1703	struct ring_buffer_event *event)
1704	{
1705	if (this_cpu_read(trace_buffered_event) == event) {
1706	/* Simply release the temp buffer and enable preemption */
1707	this_cpu_dec(trace_buffered_event_cnt);
1708	preempt_enable_notrace();
1709	return;
1710	}
1711	/* ring_buffer_discard_commit() enables preemption */
1712	ring_buffer_discard_commit(buffer, event);
1713	}
1714
1715	/*
1716	* Helper function for event_trigger_unlock_commit{_regs}().
1717	* If there are event triggers attached to this event that requires
1718	* filtering against its fields, then they will be called as the
1719	* entry already holds the field information of the current event.
1720	*
1721	* It also checks if the event should be discarded or not.
1722	* It is to be discarded if the event is soft disabled and the
1723	* event was only recorded to process triggers, or if the event
1724	* filter is active and this event did not match the filters.
1725	*
1726	* Returns true if the event is discarded, false otherwise.
1727	*/
1728	static inline bool
1729	__event_trigger_test_discard(struct trace_event_file *file,
1730	struct trace_buffer *buffer,
1731	struct ring_buffer_event *event,
1732	void *entry,
1733	enum event_trigger_type *tt)
1734	{
1735	unsigned long eflags = file->flags;
1736
1737	if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1738	*tt = event_triggers_call(file, buffer, entry, event);
1739
1740	if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED \|
1741	EVENT_FILE_FL_FILTERED \|
1742	EVENT_FILE_FL_PID_FILTER))))
1743	return false;
1744
1745	if (file->flags & EVENT_FILE_FL_SOFT_DISABLED)
1746	goto discard;
1747
1748	if (file->flags & EVENT_FILE_FL_FILTERED &&
1749	!filter_match_preds(file->filter, entry))
1750	goto discard;
1751
1752	if ((file->flags & EVENT_FILE_FL_PID_FILTER) &&
1753	trace_event_ignore_this_pid(file))
1754	goto discard;
1755
1756	return false;
1757	discard:
1758	__trace_event_discard_commit(buffer, event);
1759	return true;
1760	}
1761
1762	/**
1763	* event_trigger_unlock_commit - handle triggers and finish event commit
1764	* @file: The file pointer associated with the event
1765	* @buffer: The ring buffer that the event is being written to
1766	* @event: The event meta data in the ring buffer
1767	* @entry: The event itself
1768	* @trace_ctx: The tracing context flags.
1769	*
1770	* This is a helper function to handle triggers that require data
1771	* from the event itself. It also tests the event against filters and
1772	* if the event is soft disabled and should be discarded.
1773	*/
1774	static inline void
1775	event_trigger_unlock_commit(struct trace_event_file *file,
1776	struct trace_buffer *buffer,
1777	struct ring_buffer_event *event,
1778	void *entry, unsigned int trace_ctx)
1779	{
1780	enum event_trigger_type tt = ETT_NONE;
1781
1782	if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1783	trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx);
1784
1785	if (tt)
1786	event_triggers_post_call(file, tt);
1787	}
1788
1789	#define FILTER_PRED_INVALID ((unsigned short)-1)
1790	#define FILTER_PRED_IS_RIGHT (1 << 15)
1791	#define FILTER_PRED_FOLD (1 << 15)
1792
1793	/*
1794	* The max preds is the size of unsigned short with
1795	* two flags at the MSBs. One bit is used for both the IS_RIGHT
1796	* and FOLD flags. The other is reserved.
1797	*
1798	* 2^14 preds is way more than enough.
1799	*/
1800	#define MAX_FILTER_PRED 16384
1801
1802	struct filter_pred;
1803	struct regex;
1804
1805	typedef int (regex_match_func)(char str, struct regex *r, int len);
1806
1807	enum regex_type {
1808	MATCH_FULL = 0,
1809	MATCH_FRONT_ONLY,
1810	MATCH_MIDDLE_ONLY,
1811	MATCH_END_ONLY,
1812	MATCH_GLOB,
1813	MATCH_INDEX,
1814	};
1815
1816	struct regex {
1817	char pattern[MAX_FILTER_STR_VAL];
1818	int len;
1819	int field_len;
1820	regex_match_func match;
1821	};
1822
1823	static inline bool is_string_field(struct ftrace_event_field *field)
1824	{
1825	return field->filter_type == FILTER_DYN_STRING \|\|
1826	field->filter_type == FILTER_RDYN_STRING \|\|
1827	field->filter_type == FILTER_STATIC_STRING \|\|
1828	field->filter_type == FILTER_PTR_STRING \|\|
1829	field->filter_type == FILTER_COMM;
1830	}
1831
1832	static inline bool is_function_field(struct ftrace_event_field *field)
1833	{
1834	return field->filter_type == FILTER_TRACE_FN;
1835	}
1836
1837	extern enum regex_type
1838	filter_parse_regex(char buff, int len, char search, int not);
1839	extern void print_event_filter(struct trace_event_file *file,
1840	struct trace_seq *s);
1841	extern int apply_event_filter(struct trace_event_file *file,
1842	char *filter_string);
1843	extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1844	char *filter_string);
1845	extern void print_subsystem_event_filter(struct event_subsystem *system,
1846	struct trace_seq *s);
1847	extern int filter_assign_type(const char *type);
1848	extern int create_event_filter(struct trace_array *tr,
1849	struct trace_event_call *call,
1850	char *filter_str, bool set_str,
1851	struct event_filter **filterp);
1852	extern void free_event_filter(struct event_filter *filter);
1853
1854	struct ftrace_event_field *
1855	trace_find_event_field(struct trace_event_call call, char name);
1856
1857	extern void trace_event_enable_cmd_record(bool enable);
1858	extern void trace_event_enable_tgid_record(bool enable);
1859
1860	extern int event_trace_init(void);
1861	extern int init_events(void);
1862	extern int event_trace_add_tracer(struct dentry parent, struct trace_array tr);
1863	extern int event_trace_del_tracer(struct trace_array *tr);
1864	extern void __trace_early_add_events(struct trace_array *tr);
1865
1866	extern struct trace_event_file __find_event_file(struct trace_array tr,
1867	const char *system,
1868	const char *event);
1869	extern struct trace_event_file find_event_file(struct trace_array tr,
1870	const char *system,
1871	const char *event);
1872
1873	extern struct mutex event_mutex;
1874	extern struct list_head ftrace_events;
1875
1876	/*
1877	* When the trace_event_file is the filp->i_private pointer,
1878	* it must be taken under the event_mutex lock, and then checked
1879	* if the EVENT_FILE_FL_FREED flag is set. If it is, then the
1880	* data pointed to by the trace_event_file can not be trusted.
1881	*
1882	* Use the event_file_file() to access the trace_event_file from
1883	* the filp the first time under the event_mutex and check for
1884	* NULL. If it is needed to be retrieved again and the event_mutex
1885	* is still held, then the event_file_data() can be used and it
1886	* is guaranteed to be valid.
1887	*/
1888	static inline struct trace_event_file event_file_file(struct file filp)
1889	{
1890	struct trace_event_file *file;
1891
1892	lockdep_assert_held(&event_mutex);
1893	file = file_inode(filp)->i_private;
1894	if (!file \|\| file->flags & EVENT_FILE_FL_FREED)
1895	return NULL;
1896	return file;
1897	}
1898
1899	static inline void event_file_data(struct file filp)
1900	{
1901	struct trace_event_file *file;
1902
1903	lockdep_assert_held(&event_mutex);
1904	file = file_inode(filp)->i_private;
1905	WARN_ON(!file \|\| file->flags & EVENT_FILE_FL_FREED);
1906	return file;
1907	}
1908
1909	extern const struct file_operations event_trigger_fops;
1910	extern const struct file_operations event_hist_fops;
1911	extern const struct file_operations event_hist_debug_fops;
1912	extern const struct file_operations event_inject_fops;
1913
1914	#ifdef CONFIG_HIST_TRIGGERS
1915	extern int register_trigger_hist_cmd(void);
1916	extern int register_trigger_hist_enable_disable_cmds(void);
1917	#else
1918	static inline int register_trigger_hist_cmd(void) { return 0; }
1919	static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1920	#endif
1921
1922	extern int register_trigger_cmds(void);
1923	extern void clear_event_triggers(struct trace_array *tr);
1924
1925	enum {
1926	EVENT_TRIGGER_FL_PROBE = BIT(0),
1927	EVENT_TRIGGER_FL_COUNT = BIT(1),
1928	};
1929
1930	struct event_trigger_data {
1931	unsigned long count;
1932	int ref;
1933	int flags;
1934	struct event_command *cmd_ops;
1935	struct event_filter __rcu *filter;
1936	char *filter_str;
1937	void *private_data;
1938	bool paused;
1939	bool paused_tmp;
1940	struct list_head list;
1941	char *name;
1942	struct list_head named_list;
1943	struct event_trigger_data *named_data;
1944	struct llist_node llist;
1945	void (private_data_free)(struct event_trigger_data data);
1946	};
1947
1948	/* Avoid typos */
1949	#define ENABLE_EVENT_STR "enable_event"
1950	#define DISABLE_EVENT_STR "disable_event"
1951	#define ENABLE_HIST_STR "enable_hist"
1952	#define DISABLE_HIST_STR "disable_hist"
1953
1954	struct enable_trigger_data {
1955	struct trace_event_file *file;
1956	struct trace_event_call *call;
1957	bool enable;
1958	bool hist;
1959	};
1960
1961	bool event_trigger_count(struct event_trigger_data *data,
1962	struct trace_buffer buffer, void rec,
1963	struct ring_buffer_event *event);
1964
1965	extern int event_enable_trigger_print(struct seq_file *m,
1966	struct event_trigger_data *data);
1967	extern void event_enable_trigger_free(struct event_trigger_data *data);
1968	extern int event_enable_trigger_parse(struct event_command *cmd_ops,
1969	struct trace_event_file *file,
1970	char glob, char cmd,
1971	char *param_and_filter);
1972	extern int event_enable_register_trigger(char *glob,
1973	struct event_trigger_data *data,
1974	struct trace_event_file *file);
1975	extern void event_enable_unregister_trigger(char *glob,
1976	struct event_trigger_data *test,
1977	struct trace_event_file *file);
1978	extern struct event_trigger_data *
1979	trigger_data_alloc(struct event_command cmd_ops, char cmd, char *param,
1980	void *private_data);
1981	extern void trigger_data_free(struct event_trigger_data *data);
1982	extern int event_trigger_init(struct event_trigger_data *data);
1983	extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1984	int trigger_enable);
1985	extern void update_cond_flag(struct trace_event_file *file);
1986	extern int set_trigger_filter(char *filter_str,
1987	struct event_trigger_data *trigger_data,
1988	struct trace_event_file *file);
1989	extern struct event_trigger_data find_named_trigger(const char name);
1990	extern bool is_named_trigger(struct event_trigger_data *test);
1991	extern int save_named_trigger(const char *name,
1992	struct event_trigger_data *data);
1993	extern void del_named_trigger(struct event_trigger_data *data);
1994	extern void pause_named_trigger(struct event_trigger_data *data);
1995	extern void unpause_named_trigger(struct event_trigger_data *data);
1996	extern void set_named_trigger_data(struct event_trigger_data *data,
1997	struct event_trigger_data *named_data);
1998	extern struct event_trigger_data *
1999	get_named_trigger_data(struct event_trigger_data *data);
2000	extern int register_event_command(struct event_command *cmd);
2001	extern int unregister_event_command(struct event_command *cmd);
2002	extern int register_trigger_hist_enable_disable_cmds(void);
2003	extern bool event_trigger_check_remove(const char *glob);
2004	extern bool event_trigger_empty_param(const char *param);
2005	extern int event_trigger_separate_filter(char param_and_filter, char *param,
2006	char **filter, bool param_required);
2007	extern int event_trigger_parse_num(char *trigger,
2008	struct event_trigger_data *trigger_data);
2009	extern int event_trigger_set_filter(struct event_command *cmd_ops,
2010	struct trace_event_file *file,
2011	char *param,
2012	struct event_trigger_data *trigger_data);
2013	extern void event_trigger_reset_filter(struct event_command *cmd_ops,
2014	struct event_trigger_data *trigger_data);
2015	extern int event_trigger_register(struct event_command *cmd_ops,
2016	struct trace_event_file *file,
2017	char *glob,
2018	struct event_trigger_data *trigger_data);
2019	extern void event_trigger_unregister(struct event_command *cmd_ops,
2020	struct trace_event_file *file,
2021	char *glob,
2022	struct event_trigger_data *trigger_data);
2023
2024	extern void event_file_get(struct trace_event_file *file);
2025	extern void event_file_put(struct trace_event_file *file);
2026
2027	/**
2028	* struct event_command - callbacks and data members for event commands
2029	*
2030	* Event commands are invoked by users by writing the command name
2031	* into the 'trigger' file associated with a trace event. The
2032	* parameters associated with a specific invocation of an event
2033	* command are used to create an event trigger instance, which is
2034	* added to the list of trigger instances associated with that trace
2035	* event. When the event is hit, the set of triggers associated with
2036	* that event is invoked.
2037	*
2038	* The data members in this structure provide per-event command data
2039	* for various event commands.
2040	*
2041	* All the data members below, except for @post_trigger, must be set
2042	* for each event command.
2043	*
2044	* @name: The unique name that identifies the event command. This is
2045	* the name used when setting triggers via trigger files.
2046	*
2047	* @trigger_type: A unique id that identifies the event command
2048	* 'type'. This value has two purposes, the first to ensure that
2049	* only one trigger of the same type can be set at a given time
2050	* for a particular event e.g. it doesn't make sense to have both
2051	* a traceon and traceoff trigger attached to a single event at
2052	* the same time, so traceon and traceoff have the same type
2053	* though they have different names. The @trigger_type value is
2054	* also used as a bit value for deferring the actual trigger
2055	* action until after the current event is finished. Some
2056	* commands need to do this if they themselves log to the trace
2057	* buffer (see the @post_trigger() member below). @trigger_type
2058	* values are defined by adding new values to the trigger_type
2059	* enum in include/linux/trace_events.h.
2060	*
2061	* @flags: See the enum event_command_flags below.
2062	*
2063	* All the methods below, except for @set_filter() and @unreg_all(),
2064	* must be implemented.
2065	*
2066	* @parse: The callback function responsible for parsing and
2067	* registering the trigger written to the 'trigger' file by the
2068	* user. It allocates the trigger instance and registers it with
2069	* the appropriate trace event. It makes use of the other
2070	* event_command callback functions to orchestrate this, and is
2071	* usually implemented by the generic utility function
2072	* @event_trigger_callback() (see trace_event_triggers.c).
2073	*
2074	* @reg: Adds the trigger to the list of triggers associated with the
2075	* event, and enables the event trigger itself, after
2076	* initializing it (via the event_command @init() function).
2077	* This is also where commands can use the @trigger_type value to
2078	* make the decision as to whether or not multiple instances of
2079	* the trigger should be allowed. This is usually implemented by
2080	* the generic utility function @register_trigger() (see
2081	* trace_event_triggers.c).
2082	*
2083	* @unreg: Removes the trigger from the list of triggers associated
2084	* with the event, and disables the event trigger itself, after
2085	* initializing it (via the event_command @free() function).
2086	* This is usually implemented by the generic utility function
2087	* @unregister_trigger() (see trace_event_triggers.c).
2088	*
2089	* @unreg_all: An optional function called to remove all the triggers
2090	* from the list of triggers associated with the event. Called
2091	* when a trigger file is opened in truncate mode.
2092	*
2093	* @set_filter: An optional function called to parse and set a filter
2094	* for the trigger. If no @set_filter() method is set for the
2095	* event command, filters set by the user for the command will be
2096	* ignored. This is usually implemented by the generic utility
2097	* function @set_trigger_filter() (see trace_event_triggers.c).
2098	*
2099	* All the methods below, except for @init() and @free(), must be
2100	* implemented.
2101	*
2102	* @trigger: The trigger 'probe' function called when the triggering
2103	* event occurs. The data passed into this callback is the data
2104	* that was supplied to the event_command @reg() function that
2105	* registered the trigger (see struct event_command) along with
2106	* the trace record, rec.
2107	*
2108	* @count_func: If defined and a numeric parameter is passed to the
2109	* trigger, then this function will be called before @trigger
2110	* is called. If this function returns false, then @trigger is not
2111	* executed.
2112	*
2113	* @init: An optional initialization function called for the trigger
2114	* when the trigger is registered (via the event_command reg()
2115	* function). This can be used to perform per-trigger
2116	* initialization such as incrementing a per-trigger reference
2117	* count, for instance. This is usually implemented by the
2118	* generic utility function @event_trigger_init() (see
2119	* trace_event_triggers.c).
2120	*
2121	* @free: An optional de-initialization function called for the
2122	* trigger when the trigger is unregistered (via the
2123	* event_command @reg() function). This can be used to perform
2124	* per-trigger de-initialization such as decrementing a
2125	* per-trigger reference count and freeing corresponding trigger
2126	* data, for instance. This is usually implemented by the
2127	* generic utility function @event_trigger_free() (see
2128	* trace_event_triggers.c).
2129	*
2130	* @print: The callback function invoked to have the trigger print
2131	* itself. This is usually implemented by a wrapper function
2132	* that calls the generic utility function @event_trigger_print()
2133	* (see trace_event_triggers.c).
2134	*/
2135	struct event_command {
2136	struct list_head list;
2137	char *name;
2138	enum event_trigger_type trigger_type;
2139	int flags;
2140	int (parse)(struct event_command cmd_ops,
2141	struct trace_event_file *file,
2142	char glob, char cmd,
2143	char *param_and_filter);
2144	int (reg)(char glob,
2145	struct event_trigger_data *data,
2146	struct trace_event_file *file);
2147	void (unreg)(char glob,
2148	struct event_trigger_data *data,
2149	struct trace_event_file *file);
2150	void (unreg_all)(struct trace_event_file file);
2151	int (set_filter)(char filter_str,
2152	struct event_trigger_data *data,
2153	struct trace_event_file *file);
2154	void (trigger)(struct event_trigger_data data,
2155	struct trace_buffer *buffer,
2156	void *rec,
2157	struct ring_buffer_event *rbe);
2158	bool (count_func)(struct event_trigger_data data,
2159	struct trace_buffer *buffer,
2160	void *rec,
2161	struct ring_buffer_event *rbe);
2162	int (init)(struct event_trigger_data data);
2163	void (free)(struct event_trigger_data data);
2164	int (print)(struct seq_file m,
2165	struct event_trigger_data *data);
2166	};
2167
2168	/**
2169	* enum event_command_flags - flags for struct event_command
2170	*
2171	* @POST_TRIGGER: A flag that says whether or not this command needs
2172	* to have its action delayed until after the current event has
2173	* been closed. Some triggers need to avoid being invoked while
2174	* an event is currently in the process of being logged, since
2175	* the trigger may itself log data into the trace buffer. Thus
2176	* we make sure the current event is committed before invoking
2177	* those triggers. To do that, the trigger invocation is split
2178	* in two - the first part checks the filter using the current
2179	* trace record; if a command has the @post_trigger flag set, it
2180	* sets a bit for itself in the return value, otherwise it
2181	* directly invokes the trigger. Once all commands have been
2182	* either invoked or set their return flag, the current record is
2183	* either committed or discarded. At that point, if any commands
2184	* have deferred their triggers, those commands are finally
2185	* invoked following the close of the current event. In other
2186	* words, if the event_command @func() probe implementation
2187	* itself logs to the trace buffer, this flag should be set,
2188	* otherwise it can be left unspecified.
2189	*
2190	* @NEEDS_REC: A flag that says whether or not this command needs
2191	* access to the trace record in order to perform its function,
2192	* regardless of whether or not it has a filter associated with
2193	* it (filters make a trigger require access to the trace record
2194	* but are not always present).
2195	*/
2196	enum event_command_flags {
2197	EVENT_CMD_FL_POST_TRIGGER = 1,
2198	EVENT_CMD_FL_NEEDS_REC = 2,
2199	};
2200
2201	static inline bool event_command_post_trigger(struct event_command *cmd_ops)
2202	{
2203	return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
2204	}
2205
2206	static inline bool event_command_needs_rec(struct event_command *cmd_ops)
2207	{
2208	return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
2209	}
2210
2211	extern int trace_event_enable_disable(struct trace_event_file *file,
2212	int enable, int soft_disable);
2213
2214	extern const char *__start___trace_bprintk_fmt[];
2215	extern const char *__stop___trace_bprintk_fmt[];
2216
2217	extern const char *__start___tracepoint_str[];
2218	extern const char *__stop___tracepoint_str[];
2219
2220	void trace_printk_control(bool enabled);
2221	void trace_printk_start_comm(void);
2222	void trace_printk_start_stop_comm(int enabled);
2223	int trace_keep_overwrite(struct tracer *tracer, u64 mask, int set);
2224	int set_tracer_flag(struct trace_array *tr, u64 mask, int enabled);
2225
2226	/* Used from boot time tracer */
2227	extern int trace_set_options(struct trace_array tr, char option);
2228	extern int tracing_set_tracer(struct trace_array tr, const char buf);
2229	extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
2230	unsigned long size, int cpu_id);
2231	extern int tracing_set_cpumask(struct trace_array *tr,
2232	cpumask_var_t tracing_cpumask_new);
2233
2234
2235	#define MAX_EVENT_NAME_LEN 64
2236
2237	extern ssize_t trace_parse_run_command(struct file *file,
2238	const char __user buffer, size_t count, loff_t ppos,
2239	int (createfn)(const char ));
2240
2241	extern unsigned int err_pos(char cmd, const char str);
2242	extern void tracing_log_err(struct trace_array *tr,
2243	const char loc, const char cmd,
2244	const char **errs, u8 type, u16 pos);
2245
2246	/*
2247	* Normal trace_printk() and friends allocates special buffers
2248	* to do the manipulation, as well as saves the print formats
2249	* into sections to display. But the trace infrastructure wants
2250	* to use these without the added overhead at the price of being
2251	* a bit slower (used mainly for warnings, where we don't care
2252	* about performance). The internal_trace_puts() is for such
2253	* a purpose.
2254	*/
2255	#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str)
2256
2257	#undef FTRACE_ENTRY
2258	#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
2259	extern struct trace_event_call \
2260	__aligned(4) event_##call;
2261	#undef FTRACE_ENTRY_DUP
2262	#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
2263	FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
2264	#undef FTRACE_ENTRY_PACKED
2265	#define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \
2266	FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
2267
2268	#include "trace_entries.h"
2269
2270	#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
2271	int perf_ftrace_event_register(struct trace_event_call *call,
2272	enum trace_reg type, void *data);
2273	#else
2274	#define perf_ftrace_event_register NULL
2275	#endif
2276
2277	#ifdef CONFIG_FTRACE_SYSCALLS
2278	void init_ftrace_syscalls(void);
2279	const char *get_syscall_name(int syscall);
2280	#else
2281	static inline void init_ftrace_syscalls(void) { }
2282	static inline const char *get_syscall_name(int syscall)
2283	{
2284	return NULL;
2285	}
2286	#endif
2287
2288	#ifdef CONFIG_EVENT_TRACING
2289	void trace_event_init(void);
2290	void trace_event_update_all(struct trace_eval_map *map, int len, struct module mod);
2291	/* Used from boot time tracer */
2292	extern int ftrace_set_clr_event(struct trace_array tr, char buf, int set);
2293	extern int trigger_process_regex(struct trace_event_file file, char buff);
2294	#else
2295	static inline void __init trace_event_init(void) { }
2296	static inline void trace_event_update_all(struct trace_eval_map *map, int len, struct module mod) { }
2297	#endif
2298
2299	#ifdef CONFIG_TRACER_SNAPSHOT
2300	extern const struct file_operations snapshot_fops;
2301	extern const struct file_operations snapshot_raw_fops;
2302
2303	/* Used when creating instances */
2304	int trace_allocate_snapshot(struct trace_array *tr, int size);
2305
2306	int tracing_alloc_snapshot(void);
2307	void tracing_snapshot_cond(struct trace_array tr, void cond_data);
2308	int tracing_snapshot_cond_enable(struct trace_array tr, void cond_data, cond_update_fn_t update);
2309	int tracing_snapshot_cond_disable(struct trace_array *tr);
2310	void tracing_cond_snapshot_data(struct trace_array tr);
2311	void tracing_snapshot_instance(struct trace_array *tr);
2312	int tracing_alloc_snapshot_instance(struct trace_array *tr);
2313	int tracing_arm_snapshot_locked(struct trace_array *tr);
2314	int tracing_arm_snapshot(struct trace_array *tr);
2315	void tracing_disarm_snapshot(struct trace_array *tr);
2316	void free_snapshot(struct trace_array *tr);
2317	void print_snapshot_help(struct seq_file m, struct trace_iterator iter);
2318	int get_snapshot_map(struct trace_array *tr);
2319	void put_snapshot_map(struct trace_array *tr);
2320	int resize_buffer_duplicate_size(struct array_buffer *trace_buf,
2321	struct array_buffer *size_buf, int cpu_id);
2322	__init void do_allocate_snapshot(const char *name);
2323	# ifdef CONFIG_DYNAMIC_FTRACE
2324	__init int register_snapshot_cmd(void);
2325	# else
2326	static inline int register_snapshot_cmd(void) { return 0; }
2327	# endif
2328	#else /* !CONFIG_TRACER_SNAPSHOT */
2329	static inline int trace_allocate_snapshot(struct trace_array *tr, int size) { return 0; }
2330	static inline void tracing_snapshot_instance(struct trace_array *tr) { }
2331	static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
2332	{
2333	return 0;
2334	}
2335	static inline int tracing_arm_snapshot_locked(struct trace_array *tr) { return -EBUSY; }
2336	static inline int tracing_arm_snapshot(struct trace_array *tr) { return 0; }
2337	static inline void tracing_disarm_snapshot(struct trace_array *tr) { }
2338	static inline void free_snapshot(struct trace_array *tr) {}
2339	static inline void tracing_snapshot_cond(struct trace_array tr, void cond_data)
2340	{
2341	WARN_ONCE(1, "Snapshot feature not enabled, but internal conditional snapshot used");
2342	}
2343	static inline void tracing_cond_snapshot_data(struct trace_array tr)
2344	{
2345	return NULL;
2346	}
2347	static inline int tracing_snapshot_cond_enable(struct trace_array tr, void cond_data, cond_update_fn_t update)
2348	{
2349	return -ENODEV;
2350	}
2351	static inline int tracing_snapshot_cond_disable(struct trace_array *tr)
2352	{
2353	return false;
2354	}
2355	static inline void print_snapshot_help(struct seq_file m, struct trace_iterator iter)
2356	{
2357	/* Should never be called */
2358	WARN_ONCE(1, "Snapshot print function called without snapshot configured");
2359	}
2360	static inline int get_snapshot_map(struct trace_array *tr) { return 0; }
2361	static inline void put_snapshot_map(struct trace_array *tr) { }
2362	static inline void do_allocate_snapshot(const char *name) { }
2363	static inline int register_snapshot_cmd(void) { return 0; }
2364	#endif /* CONFIG_TRACER_SNAPSHOT */
2365
2366	#ifdef CONFIG_PREEMPT_TRACER
2367	void tracer_preempt_on(unsigned long a0, unsigned long a1);
2368	void tracer_preempt_off(unsigned long a0, unsigned long a1);
2369	#else
2370	static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
2371	static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
2372	#endif
2373	#ifdef CONFIG_IRQSOFF_TRACER
2374	void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
2375	void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
2376	#else
2377	static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
2378	static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
2379	#endif
2380
2381	/*
2382	* Reset the state of the trace_iterator so that it can read consumed data.
2383	* Normally, the trace_iterator is used for reading the data when it is not
2384	* consumed, and must retain state.
2385	*/
2386	static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
2387	{
2388	memset_startat(iter, 0, seq);
2389	iter->pos = -1;
2390	}
2391
2392	/* Check the name is good for event/group/fields */
2393	static inline bool __is_good_name(const char *name, bool hash_ok)
2394	{
2395	if (!isalpha(name) && name != '_' && (!hash_ok \|\| *name != '-'))
2396	return false;
2397	while (*++name != '\0') {
2398	if (!isalpha(name) && !isdigit(name) && *name != '_' &&
2399	(!hash_ok \|\| *name != '-'))
2400	return false;
2401	}
2402	return true;
2403	}
2404
2405	/* Check the name is good for event/group/fields */
2406	static inline bool is_good_name(const char *name)
2407	{
2408	return __is_good_name(name, false);
2409	}
2410
2411	/* Check the name is good for system */
2412	static inline bool is_good_system_name(const char *name)
2413	{
2414	return __is_good_name(name, true);
2415	}
2416
2417	/* Convert certain expected symbols into '_' when generating event names */
2418	static inline void sanitize_event_name(char *name)
2419	{
2420	while (*name++ != '\0')
2421	if (name == ':' \|\| name == '.' \|\| name == '')
2422	*name = '_';
2423	}
2424
2425	#ifdef CONFIG_STACKTRACE
2426	void __ftrace_trace_stack(struct trace_array *tr,
2427	struct trace_buffer *buffer,
2428	unsigned int trace_ctx,
2429	int skip, struct pt_regs *regs);
2430
2431	static __always_inline void ftrace_trace_stack(struct trace_array *tr,
2432	struct trace_buffer *buffer,
2433	unsigned int trace_ctx,
2434	int skip, struct pt_regs *regs)
2435	{
2436	if (!(tr->trace_flags & TRACE_ITER(STACKTRACE)))
2437	return;
2438
2439	__ftrace_trace_stack(tr, buffer, trace_ctx, skip, regs);
2440	}
2441	#else
2442	static inline void __ftrace_trace_stack(struct trace_array *tr,
2443	struct trace_buffer *buffer,
2444	unsigned int trace_ctx,
2445	int skip, struct pt_regs *regs)
2446	{
2447	}
2448	static inline void ftrace_trace_stack(struct trace_array *tr,
2449	struct trace_buffer *buffer,
2450	unsigned long trace_ctx,
2451	int skip, struct pt_regs *regs)
2452	{
2453	}
2454	#endif
2455
2456	/*
2457	* This is a generic way to read and write a u64 value from a file in tracefs.
2458	*
2459	* The value is stored on the variable pointed by *val. The value needs
2460	* to be at least min and at most max. The write is protected by an
2461	* existing *lock.
2462	*/
2463	struct trace_min_max_param {
2464	struct mutex *lock;
2465	u64 *val;
2466	u64 *min;
2467	u64 *max;
2468	};
2469
2470	#define U64_STR_SIZE 24 /* 20 digits max */
2471
2472	extern const struct file_operations trace_min_max_fops;
2473
2474	#ifdef CONFIG_RV
2475	extern int rv_init_interface(void);
2476	#else
2477	static inline int rv_init_interface(void)
2478	{
2479	return 0;
2480	}
2481	#endif
2482
2483	/*
2484	* This is used only to distinguish
2485	* function address from trampoline code.
2486	* So this value has no meaning.
2487	*/
2488	#define FTRACE_TRAMPOLINE_MARKER ((unsigned long) INT_MAX)
2489
2490	/*
2491	* This is used to get the address of the args array based on
2492	* the type of the entry.
2493	*/
2494	#define FGRAPH_ENTRY_ARGS(e) \
2495	({ \
2496	unsigned long *_args; \
2497	struct ftrace_graph_ent_entry *_e = e; \
2498	\
2499	if (IS_ENABLED(CONFIG_FUNCTION_GRAPH_RETADDR) && \
2500	e->ent.type == TRACE_GRAPH_RETADDR_ENT) { \
2501	struct fgraph_retaddr_ent_entry *_re; \
2502	\
2503	_re = (typeof(_re))_e; \
2504	_args = _re->args; \
2505	} else { \
2506	_args = _e->args; \
2507	} \
2508	_args; \
2509	})
2510
2511	#endif /* _LINUX_KERNEL_TRACE_H */