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