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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
23#ifdef CONFIG_FTRACE_SYSCALLS
24#include <asm/unistd.h> /* For NR_SYSCALLS */
25#include <asm/syscall.h> /* some archs define it here */
26#endif
27
28enum trace_type {
29 __TRACE_FIRST_TYPE = 0,
30
31 TRACE_FN,
32 TRACE_CTX,
33 TRACE_WAKE,
34 TRACE_STACK,
35 TRACE_PRINT,
36 TRACE_BPRINT,
37 TRACE_MMIO_RW,
38 TRACE_MMIO_MAP,
39 TRACE_BRANCH,
40 TRACE_GRAPH_RET,
41 TRACE_GRAPH_ENT,
42 TRACE_USER_STACK,
43 TRACE_BLK,
44 TRACE_BPUTS,
45 TRACE_HWLAT,
46 TRACE_RAW_DATA,
47
48 __TRACE_LAST_TYPE,
49};
50
51
52#undef __field
53#define __field(type, item) type item;
54
55#undef __field_fn
56#define __field_fn(type, item) type item;
57
58#undef __field_struct
59#define __field_struct(type, item) __field(type, item)
60
61#undef __field_desc
62#define __field_desc(type, container, item)
63
64#undef __array
65#define __array(type, item, size) type item[size];
66
67#undef __array_desc
68#define __array_desc(type, container, item, size)
69
70#undef __dynamic_array
71#define __dynamic_array(type, item) type item[];
72
73#undef F_STRUCT
74#define F_STRUCT(args...) args
75
76#undef FTRACE_ENTRY
77#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
78 struct struct_name { \
79 struct trace_entry ent; \
80 tstruct \
81 }
82
83#undef FTRACE_ENTRY_DUP
84#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
85
86#undef FTRACE_ENTRY_REG
87#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
88 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
89
90#undef FTRACE_ENTRY_PACKED
91#define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \
92 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed
93
94#include "trace_entries.h"
95
96/* Use this for memory failure errors */
97#define MEM_FAIL(condition, fmt, ...) ({ \
98 static bool __section(.data.once) __warned; \
99 int __ret_warn_once = !!(condition); \
100 \
101 if (unlikely(__ret_warn_once && !__warned)) { \
102 __warned = true; \
103 pr_err("ERROR: " fmt, ##__VA_ARGS__); \
104 } \
105 unlikely(__ret_warn_once); \
106})
107
108/*
109 * syscalls are special, and need special handling, this is why
110 * they are not included in trace_entries.h
111 */
112struct syscall_trace_enter {
113 struct trace_entry ent;
114 int nr;
115 unsigned long args[];
116};
117
118struct syscall_trace_exit {
119 struct trace_entry ent;
120 int nr;
121 long ret;
122};
123
124struct kprobe_trace_entry_head {
125 struct trace_entry ent;
126 unsigned long ip;
127};
128
129struct kretprobe_trace_entry_head {
130 struct trace_entry ent;
131 unsigned long func;
132 unsigned long ret_ip;
133};
134
135/*
136 * trace_flag_type is an enumeration that holds different
137 * states when a trace occurs. These are:
138 * IRQS_OFF - interrupts were disabled
139 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
140 * NEED_RESCHED - reschedule is requested
141 * HARDIRQ - inside an interrupt handler
142 * SOFTIRQ - inside a softirq handler
143 */
144enum trace_flag_type {
145 TRACE_FLAG_IRQS_OFF = 0x01,
146 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
147 TRACE_FLAG_NEED_RESCHED = 0x04,
148 TRACE_FLAG_HARDIRQ = 0x08,
149 TRACE_FLAG_SOFTIRQ = 0x10,
150 TRACE_FLAG_PREEMPT_RESCHED = 0x20,
151 TRACE_FLAG_NMI = 0x40,
152};
153
154#define TRACE_BUF_SIZE 1024
155
156struct trace_array;
157
158/*
159 * The CPU trace array - it consists of thousands of trace entries
160 * plus some other descriptor data: (for example which task started
161 * the trace, etc.)
162 */
163struct trace_array_cpu {
164 atomic_t disabled;
165 void *buffer_page; /* ring buffer spare */
166
167 unsigned long entries;
168 unsigned long saved_latency;
169 unsigned long critical_start;
170 unsigned long critical_end;
171 unsigned long critical_sequence;
172 unsigned long nice;
173 unsigned long policy;
174 unsigned long rt_priority;
175 unsigned long skipped_entries;
176 u64 preempt_timestamp;
177 pid_t pid;
178 kuid_t uid;
179 char comm[TASK_COMM_LEN];
180
181 bool ignore_pid;
182#ifdef CONFIG_FUNCTION_TRACER
183 bool ftrace_ignore_pid;
184#endif
185};
186
187struct tracer;
188struct trace_option_dentry;
189
190struct array_buffer {
191 struct trace_array *tr;
192 struct trace_buffer *buffer;
193 struct trace_array_cpu __percpu *data;
194 u64 time_start;
195 int cpu;
196};
197
198#define TRACE_FLAGS_MAX_SIZE 32
199
200struct trace_options {
201 struct tracer *tracer;
202 struct trace_option_dentry *topts;
203};
204
205struct trace_pid_list {
206 int pid_max;
207 unsigned long *pids;
208};
209
210typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
211
212/**
213 * struct cond_snapshot - conditional snapshot data and callback
214 *
215 * The cond_snapshot structure encapsulates a callback function and
216 * data associated with the snapshot for a given tracing instance.
217 *
218 * When a snapshot is taken conditionally, by invoking
219 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
220 * passed in turn to the cond_snapshot.update() function. That data
221 * can be compared by the update() implementation with the cond_data
222 * contained wihin the struct cond_snapshot instance associated with
223 * the trace_array. Because the tr->max_lock is held throughout the
224 * update() call, the update() function can directly retrieve the
225 * cond_snapshot and cond_data associated with the per-instance
226 * snapshot associated with the trace_array.
227 *
228 * The cond_snapshot.update() implementation can save data to be
229 * associated with the snapshot if it decides to, and returns 'true'
230 * in that case, or it returns 'false' if the conditional snapshot
231 * shouldn't be taken.
232 *
233 * The cond_snapshot instance is created and associated with the
234 * user-defined cond_data by tracing_cond_snapshot_enable().
235 * Likewise, the cond_snapshot instance is destroyed and is no longer
236 * associated with the trace instance by
237 * tracing_cond_snapshot_disable().
238 *
239 * The method below is required.
240 *
241 * @update: When a conditional snapshot is invoked, the update()
242 * callback function is invoked with the tr->max_lock held. The
243 * update() implementation signals whether or not to actually
244 * take the snapshot, by returning 'true' if so, 'false' if no
245 * snapshot should be taken. Because the max_lock is held for
246 * the duration of update(), the implementation is safe to
247 * directly retrieven and save any implementation data it needs
248 * to in association with the snapshot.
249 */
250struct cond_snapshot {
251 void *cond_data;
252 cond_update_fn_t update;
253};
254
255/*
256 * The trace array - an array of per-CPU trace arrays. This is the
257 * highest level data structure that individual tracers deal with.
258 * They have on/off state as well:
259 */
260struct trace_array {
261 struct list_head list;
262 char *name;
263 struct array_buffer array_buffer;
264#ifdef CONFIG_TRACER_MAX_TRACE
265 /*
266 * The max_buffer is used to snapshot the trace when a maximum
267 * latency is reached, or when the user initiates a snapshot.
268 * Some tracers will use this to store a maximum trace while
269 * it continues examining live traces.
270 *
271 * The buffers for the max_buffer are set up the same as the array_buffer
272 * When a snapshot is taken, the buffer of the max_buffer is swapped
273 * with the buffer of the array_buffer and the buffers are reset for
274 * the array_buffer so the tracing can continue.
275 */
276 struct array_buffer max_buffer;
277 bool allocated_snapshot;
278#endif
279#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
280 unsigned long max_latency;
281#ifdef CONFIG_FSNOTIFY
282 struct dentry *d_max_latency;
283 struct work_struct fsnotify_work;
284 struct irq_work fsnotify_irqwork;
285#endif
286#endif
287 struct trace_pid_list __rcu *filtered_pids;
288 /*
289 * max_lock is used to protect the swapping of buffers
290 * when taking a max snapshot. The buffers themselves are
291 * protected by per_cpu spinlocks. But the action of the swap
292 * needs its own lock.
293 *
294 * This is defined as a arch_spinlock_t in order to help
295 * with performance when lockdep debugging is enabled.
296 *
297 * It is also used in other places outside the update_max_tr
298 * so it needs to be defined outside of the
299 * CONFIG_TRACER_MAX_TRACE.
300 */
301 arch_spinlock_t max_lock;
302 int buffer_disabled;
303#ifdef CONFIG_FTRACE_SYSCALLS
304 int sys_refcount_enter;
305 int sys_refcount_exit;
306 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
307 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
308#endif
309 int stop_count;
310 int clock_id;
311 int nr_topts;
312 bool clear_trace;
313 int buffer_percent;
314 unsigned int n_err_log_entries;
315 struct tracer *current_trace;
316 unsigned int trace_flags;
317 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
318 unsigned int flags;
319 raw_spinlock_t start_lock;
320 struct list_head err_log;
321 struct dentry *dir;
322 struct dentry *options;
323 struct dentry *percpu_dir;
324 struct dentry *event_dir;
325 struct trace_options *topts;
326 struct list_head systems;
327 struct list_head events;
328 struct trace_event_file *trace_marker_file;
329 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
330 int ref;
331#ifdef CONFIG_FUNCTION_TRACER
332 struct ftrace_ops *ops;
333 struct trace_pid_list __rcu *function_pids;
334#ifdef CONFIG_DYNAMIC_FTRACE
335 /* All of these are protected by the ftrace_lock */
336 struct list_head func_probes;
337 struct list_head mod_trace;
338 struct list_head mod_notrace;
339#endif
340 /* function tracing enabled */
341 int function_enabled;
342#endif
343 int time_stamp_abs_ref;
344 struct list_head hist_vars;
345#ifdef CONFIG_TRACER_SNAPSHOT
346 struct cond_snapshot *cond_snapshot;
347#endif
348};
349
350enum {
351 TRACE_ARRAY_FL_GLOBAL = (1 << 0)
352};
353
354extern struct list_head ftrace_trace_arrays;
355
356extern struct mutex trace_types_lock;
357
358extern int trace_array_get(struct trace_array *tr);
359extern int tracing_check_open_get_tr(struct trace_array *tr);
360extern struct trace_array *trace_array_find(const char *instance);
361extern struct trace_array *trace_array_find_get(const char *instance);
362
363extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs);
364extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
365
366extern bool trace_clock_in_ns(struct trace_array *tr);
367
368/*
369 * The global tracer (top) should be the first trace array added,
370 * but we check the flag anyway.
371 */
372static inline struct trace_array *top_trace_array(void)
373{
374 struct trace_array *tr;
375
376 if (list_empty(&ftrace_trace_arrays))
377 return NULL;
378
379 tr = list_entry(ftrace_trace_arrays.prev,
380 typeof(*tr), list);
381 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
382 return tr;
383}
384
385#define FTRACE_CMP_TYPE(var, type) \
386 __builtin_types_compatible_p(typeof(var), type *)
387
388#undef IF_ASSIGN
389#define IF_ASSIGN(var, entry, etype, id) \
390 if (FTRACE_CMP_TYPE(var, etype)) { \
391 var = (typeof(var))(entry); \
392 WARN_ON(id != 0 && (entry)->type != id); \
393 break; \
394 }
395
396/* Will cause compile errors if type is not found. */
397extern void __ftrace_bad_type(void);
398
399/*
400 * The trace_assign_type is a verifier that the entry type is
401 * the same as the type being assigned. To add new types simply
402 * add a line with the following format:
403 *
404 * IF_ASSIGN(var, ent, type, id);
405 *
406 * Where "type" is the trace type that includes the trace_entry
407 * as the "ent" item. And "id" is the trace identifier that is
408 * used in the trace_type enum.
409 *
410 * If the type can have more than one id, then use zero.
411 */
412#define trace_assign_type(var, ent) \
413 do { \
414 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
415 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
416 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
417 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
418 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
419 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
420 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
421 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
422 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
423 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
424 TRACE_MMIO_RW); \
425 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
426 TRACE_MMIO_MAP); \
427 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
428 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
429 TRACE_GRAPH_ENT); \
430 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
431 TRACE_GRAPH_RET); \
432 __ftrace_bad_type(); \
433 } while (0)
434
435/*
436 * An option specific to a tracer. This is a boolean value.
437 * The bit is the bit index that sets its value on the
438 * flags value in struct tracer_flags.
439 */
440struct tracer_opt {
441 const char *name; /* Will appear on the trace_options file */
442 u32 bit; /* Mask assigned in val field in tracer_flags */
443};
444
445/*
446 * The set of specific options for a tracer. Your tracer
447 * have to set the initial value of the flags val.
448 */
449struct tracer_flags {
450 u32 val;
451 struct tracer_opt *opts;
452 struct tracer *trace;
453};
454
455/* Makes more easy to define a tracer opt */
456#define TRACER_OPT(s, b) .name = #s, .bit = b
457
458
459struct trace_option_dentry {
460 struct tracer_opt *opt;
461 struct tracer_flags *flags;
462 struct trace_array *tr;
463 struct dentry *entry;
464};
465
466/**
467 * struct tracer - a specific tracer and its callbacks to interact with tracefs
468 * @name: the name chosen to select it on the available_tracers file
469 * @init: called when one switches to this tracer (echo name > current_tracer)
470 * @reset: called when one switches to another tracer
471 * @start: called when tracing is unpaused (echo 1 > tracing_on)
472 * @stop: called when tracing is paused (echo 0 > tracing_on)
473 * @update_thresh: called when tracing_thresh is updated
474 * @open: called when the trace file is opened
475 * @pipe_open: called when the trace_pipe file is opened
476 * @close: called when the trace file is released
477 * @pipe_close: called when the trace_pipe file is released
478 * @read: override the default read callback on trace_pipe
479 * @splice_read: override the default splice_read callback on trace_pipe
480 * @selftest: selftest to run on boot (see trace_selftest.c)
481 * @print_headers: override the first lines that describe your columns
482 * @print_line: callback that prints a trace
483 * @set_flag: signals one of your private flags changed (trace_options file)
484 * @flags: your private flags
485 */
486struct tracer {
487 const char *name;
488 int (*init)(struct trace_array *tr);
489 void (*reset)(struct trace_array *tr);
490 void (*start)(struct trace_array *tr);
491 void (*stop)(struct trace_array *tr);
492 int (*update_thresh)(struct trace_array *tr);
493 void (*open)(struct trace_iterator *iter);
494 void (*pipe_open)(struct trace_iterator *iter);
495 void (*close)(struct trace_iterator *iter);
496 void (*pipe_close)(struct trace_iterator *iter);
497 ssize_t (*read)(struct trace_iterator *iter,
498 struct file *filp, char __user *ubuf,
499 size_t cnt, loff_t *ppos);
500 ssize_t (*splice_read)(struct trace_iterator *iter,
501 struct file *filp,
502 loff_t *ppos,
503 struct pipe_inode_info *pipe,
504 size_t len,
505 unsigned int flags);
506#ifdef CONFIG_FTRACE_STARTUP_TEST
507 int (*selftest)(struct tracer *trace,
508 struct trace_array *tr);
509#endif
510 void (*print_header)(struct seq_file *m);
511 enum print_line_t (*print_line)(struct trace_iterator *iter);
512 /* If you handled the flag setting, return 0 */
513 int (*set_flag)(struct trace_array *tr,
514 u32 old_flags, u32 bit, int set);
515 /* Return 0 if OK with change, else return non-zero */
516 int (*flag_changed)(struct trace_array *tr,
517 u32 mask, int set);
518 struct tracer *next;
519 struct tracer_flags *flags;
520 int enabled;
521 int ref;
522 bool print_max;
523 bool allow_instances;
524#ifdef CONFIG_TRACER_MAX_TRACE
525 bool use_max_tr;
526#endif
527 /* True if tracer cannot be enabled in kernel param */
528 bool noboot;
529};
530
531
532/* Only current can touch trace_recursion */
533
534/*
535 * For function tracing recursion:
536 * The order of these bits are important.
537 *
538 * When function tracing occurs, the following steps are made:
539 * If arch does not support a ftrace feature:
540 * call internal function (uses INTERNAL bits) which calls...
541 * If callback is registered to the "global" list, the list
542 * function is called and recursion checks the GLOBAL bits.
543 * then this function calls...
544 * The function callback, which can use the FTRACE bits to
545 * check for recursion.
546 *
547 * Now if the arch does not suppport a feature, and it calls
548 * the global list function which calls the ftrace callback
549 * all three of these steps will do a recursion protection.
550 * There's no reason to do one if the previous caller already
551 * did. The recursion that we are protecting against will
552 * go through the same steps again.
553 *
554 * To prevent the multiple recursion checks, if a recursion
555 * bit is set that is higher than the MAX bit of the current
556 * check, then we know that the check was made by the previous
557 * caller, and we can skip the current check.
558 */
559enum {
560 TRACE_BUFFER_BIT,
561 TRACE_BUFFER_NMI_BIT,
562 TRACE_BUFFER_IRQ_BIT,
563 TRACE_BUFFER_SIRQ_BIT,
564
565 /* Start of function recursion bits */
566 TRACE_FTRACE_BIT,
567 TRACE_FTRACE_NMI_BIT,
568 TRACE_FTRACE_IRQ_BIT,
569 TRACE_FTRACE_SIRQ_BIT,
570
571 /* INTERNAL_BITs must be greater than FTRACE_BITs */
572 TRACE_INTERNAL_BIT,
573 TRACE_INTERNAL_NMI_BIT,
574 TRACE_INTERNAL_IRQ_BIT,
575 TRACE_INTERNAL_SIRQ_BIT,
576
577 TRACE_BRANCH_BIT,
578/*
579 * Abuse of the trace_recursion.
580 * As we need a way to maintain state if we are tracing the function
581 * graph in irq because we want to trace a particular function that
582 * was called in irq context but we have irq tracing off. Since this
583 * can only be modified by current, we can reuse trace_recursion.
584 */
585 TRACE_IRQ_BIT,
586
587 /* Set if the function is in the set_graph_function file */
588 TRACE_GRAPH_BIT,
589
590 /*
591 * In the very unlikely case that an interrupt came in
592 * at a start of graph tracing, and we want to trace
593 * the function in that interrupt, the depth can be greater
594 * than zero, because of the preempted start of a previous
595 * trace. In an even more unlikely case, depth could be 2
596 * if a softirq interrupted the start of graph tracing,
597 * followed by an interrupt preempting a start of graph
598 * tracing in the softirq, and depth can even be 3
599 * if an NMI came in at the start of an interrupt function
600 * that preempted a softirq start of a function that
601 * preempted normal context!!!! Luckily, it can't be
602 * greater than 3, so the next two bits are a mask
603 * of what the depth is when we set TRACE_GRAPH_BIT
604 */
605
606 TRACE_GRAPH_DEPTH_START_BIT,
607 TRACE_GRAPH_DEPTH_END_BIT,
608
609 /*
610 * To implement set_graph_notrace, if this bit is set, we ignore
611 * function graph tracing of called functions, until the return
612 * function is called to clear it.
613 */
614 TRACE_GRAPH_NOTRACE_BIT,
615};
616
617#define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0)
618#define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
619#define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit)))
620
621#define trace_recursion_depth() \
622 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3)
623#define trace_recursion_set_depth(depth) \
624 do { \
625 current->trace_recursion &= \
626 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \
627 current->trace_recursion |= \
628 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \
629 } while (0)
630
631#define TRACE_CONTEXT_BITS 4
632
633#define TRACE_FTRACE_START TRACE_FTRACE_BIT
634#define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
635
636#define TRACE_LIST_START TRACE_INTERNAL_BIT
637#define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
638
639#define TRACE_CONTEXT_MASK TRACE_LIST_MAX
640
641static __always_inline int trace_get_context_bit(void)
642{
643 int bit;
644
645 if (in_interrupt()) {
646 if (in_nmi())
647 bit = 0;
648
649 else if (in_irq())
650 bit = 1;
651 else
652 bit = 2;
653 } else
654 bit = 3;
655
656 return bit;
657}
658
659static __always_inline int trace_test_and_set_recursion(int start, int max)
660{
661 unsigned int val = current->trace_recursion;
662 int bit;
663
664 /* A previous recursion check was made */
665 if ((val & TRACE_CONTEXT_MASK) > max)
666 return 0;
667
668 bit = trace_get_context_bit() + start;
669 if (unlikely(val & (1 << bit)))
670 return -1;
671
672 val |= 1 << bit;
673 current->trace_recursion = val;
674 barrier();
675
676 return bit;
677}
678
679static __always_inline void trace_clear_recursion(int bit)
680{
681 unsigned int val = current->trace_recursion;
682
683 if (!bit)
684 return;
685
686 bit = 1 << bit;
687 val &= ~bit;
688
689 barrier();
690 current->trace_recursion = val;
691}
692
693static inline struct ring_buffer_iter *
694trace_buffer_iter(struct trace_iterator *iter, int cpu)
695{
696 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
697}
698
699int tracer_init(struct tracer *t, struct trace_array *tr);
700int tracing_is_enabled(void);
701void tracing_reset_online_cpus(struct array_buffer *buf);
702void tracing_reset_current(int cpu);
703void tracing_reset_all_online_cpus(void);
704int tracing_open_generic(struct inode *inode, struct file *filp);
705int tracing_open_generic_tr(struct inode *inode, struct file *filp);
706bool tracing_is_disabled(void);
707bool tracer_tracing_is_on(struct trace_array *tr);
708void tracer_tracing_on(struct trace_array *tr);
709void tracer_tracing_off(struct trace_array *tr);
710struct dentry *trace_create_file(const char *name,
711 umode_t mode,
712 struct dentry *parent,
713 void *data,
714 const struct file_operations *fops);
715
716struct dentry *tracing_init_dentry(void);
717
718struct ring_buffer_event;
719
720struct ring_buffer_event *
721trace_buffer_lock_reserve(struct trace_buffer *buffer,
722 int type,
723 unsigned long len,
724 unsigned long flags,
725 int pc);
726
727struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
728 struct trace_array_cpu *data);
729
730struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
731 int *ent_cpu, u64 *ent_ts);
732
733void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
734 struct ring_buffer_event *event);
735
736int trace_empty(struct trace_iterator *iter);
737
738void *trace_find_next_entry_inc(struct trace_iterator *iter);
739
740void trace_init_global_iter(struct trace_iterator *iter);
741
742void tracing_iter_reset(struct trace_iterator *iter, int cpu);
743
744unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
745unsigned long trace_total_entries(struct trace_array *tr);
746
747void trace_function(struct trace_array *tr,
748 unsigned long ip,
749 unsigned long parent_ip,
750 unsigned long flags, int pc);
751void trace_graph_function(struct trace_array *tr,
752 unsigned long ip,
753 unsigned long parent_ip,
754 unsigned long flags, int pc);
755void trace_latency_header(struct seq_file *m);
756void trace_default_header(struct seq_file *m);
757void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
758int trace_empty(struct trace_iterator *iter);
759
760void trace_graph_return(struct ftrace_graph_ret *trace);
761int trace_graph_entry(struct ftrace_graph_ent *trace);
762void set_graph_array(struct trace_array *tr);
763
764void tracing_start_cmdline_record(void);
765void tracing_stop_cmdline_record(void);
766void tracing_start_tgid_record(void);
767void tracing_stop_tgid_record(void);
768
769int register_tracer(struct tracer *type);
770int is_tracing_stopped(void);
771
772loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
773
774extern cpumask_var_t __read_mostly tracing_buffer_mask;
775
776#define for_each_tracing_cpu(cpu) \
777 for_each_cpu(cpu, tracing_buffer_mask)
778
779extern unsigned long nsecs_to_usecs(unsigned long nsecs);
780
781extern unsigned long tracing_thresh;
782
783/* PID filtering */
784
785extern int pid_max;
786
787bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
788 pid_t search_pid);
789bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
790 struct task_struct *task);
791void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
792 struct task_struct *self,
793 struct task_struct *task);
794void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
795void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
796int trace_pid_show(struct seq_file *m, void *v);
797void trace_free_pid_list(struct trace_pid_list *pid_list);
798int trace_pid_write(struct trace_pid_list *filtered_pids,
799 struct trace_pid_list **new_pid_list,
800 const char __user *ubuf, size_t cnt);
801
802#ifdef CONFIG_TRACER_MAX_TRACE
803void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
804 void *cond_data);
805void update_max_tr_single(struct trace_array *tr,
806 struct task_struct *tsk, int cpu);
807#endif /* CONFIG_TRACER_MAX_TRACE */
808
809#if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \
810 defined(CONFIG_FSNOTIFY)
811
812void latency_fsnotify(struct trace_array *tr);
813
814#else
815
816static inline void latency_fsnotify(struct trace_array *tr) { }
817
818#endif
819
820#ifdef CONFIG_STACKTRACE
821void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
822 int pc);
823#else
824static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
825 int skip, int pc)
826{
827}
828#endif /* CONFIG_STACKTRACE */
829
830extern u64 ftrace_now(int cpu);
831
832extern void trace_find_cmdline(int pid, char comm[]);
833extern int trace_find_tgid(int pid);
834extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
835
836#ifdef CONFIG_DYNAMIC_FTRACE
837extern unsigned long ftrace_update_tot_cnt;
838extern unsigned long ftrace_number_of_pages;
839extern unsigned long ftrace_number_of_groups;
840void ftrace_init_trace_array(struct trace_array *tr);
841#else
842static inline void ftrace_init_trace_array(struct trace_array *tr) { }
843#endif
844#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
845extern int DYN_FTRACE_TEST_NAME(void);
846#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
847extern int DYN_FTRACE_TEST_NAME2(void);
848
849extern bool ring_buffer_expanded;
850extern bool tracing_selftest_disabled;
851
852#ifdef CONFIG_FTRACE_STARTUP_TEST
853extern int trace_selftest_startup_function(struct tracer *trace,
854 struct trace_array *tr);
855extern int trace_selftest_startup_function_graph(struct tracer *trace,
856 struct trace_array *tr);
857extern int trace_selftest_startup_irqsoff(struct tracer *trace,
858 struct trace_array *tr);
859extern int trace_selftest_startup_preemptoff(struct tracer *trace,
860 struct trace_array *tr);
861extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
862 struct trace_array *tr);
863extern int trace_selftest_startup_wakeup(struct tracer *trace,
864 struct trace_array *tr);
865extern int trace_selftest_startup_nop(struct tracer *trace,
866 struct trace_array *tr);
867extern int trace_selftest_startup_branch(struct tracer *trace,
868 struct trace_array *tr);
869/*
870 * Tracer data references selftest functions that only occur
871 * on boot up. These can be __init functions. Thus, when selftests
872 * are enabled, then the tracers need to reference __init functions.
873 */
874#define __tracer_data __refdata
875#else
876/* Tracers are seldom changed. Optimize when selftests are disabled. */
877#define __tracer_data __read_mostly
878#endif /* CONFIG_FTRACE_STARTUP_TEST */
879
880extern void *head_page(struct trace_array_cpu *data);
881extern unsigned long long ns2usecs(u64 nsec);
882extern int
883trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
884extern int
885trace_vprintk(unsigned long ip, const char *fmt, va_list args);
886extern int
887trace_array_vprintk(struct trace_array *tr,
888 unsigned long ip, const char *fmt, va_list args);
889int trace_array_printk_buf(struct trace_buffer *buffer,
890 unsigned long ip, const char *fmt, ...);
891void trace_printk_seq(struct trace_seq *s);
892enum print_line_t print_trace_line(struct trace_iterator *iter);
893
894extern char trace_find_mark(unsigned long long duration);
895
896struct ftrace_hash;
897
898struct ftrace_mod_load {
899 struct list_head list;
900 char *func;
901 char *module;
902 int enable;
903};
904
905enum {
906 FTRACE_HASH_FL_MOD = (1 << 0),
907};
908
909struct ftrace_hash {
910 unsigned long size_bits;
911 struct hlist_head *buckets;
912 unsigned long count;
913 unsigned long flags;
914 struct rcu_head rcu;
915};
916
917struct ftrace_func_entry *
918ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
919
920static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
921{
922 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
923}
924
925/* Standard output formatting function used for function return traces */
926#ifdef CONFIG_FUNCTION_GRAPH_TRACER
927
928/* Flag options */
929#define TRACE_GRAPH_PRINT_OVERRUN 0x1
930#define TRACE_GRAPH_PRINT_CPU 0x2
931#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
932#define TRACE_GRAPH_PRINT_PROC 0x8
933#define TRACE_GRAPH_PRINT_DURATION 0x10
934#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
935#define TRACE_GRAPH_PRINT_REL_TIME 0x40
936#define TRACE_GRAPH_PRINT_IRQS 0x80
937#define TRACE_GRAPH_PRINT_TAIL 0x100
938#define TRACE_GRAPH_SLEEP_TIME 0x200
939#define TRACE_GRAPH_GRAPH_TIME 0x400
940#define TRACE_GRAPH_PRINT_FILL_SHIFT 28
941#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
942
943extern void ftrace_graph_sleep_time_control(bool enable);
944
945#ifdef CONFIG_FUNCTION_PROFILER
946extern void ftrace_graph_graph_time_control(bool enable);
947#else
948static inline void ftrace_graph_graph_time_control(bool enable) { }
949#endif
950
951extern enum print_line_t
952print_graph_function_flags(struct trace_iterator *iter, u32 flags);
953extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
954extern void
955trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
956extern void graph_trace_open(struct trace_iterator *iter);
957extern void graph_trace_close(struct trace_iterator *iter);
958extern int __trace_graph_entry(struct trace_array *tr,
959 struct ftrace_graph_ent *trace,
960 unsigned long flags, int pc);
961extern void __trace_graph_return(struct trace_array *tr,
962 struct ftrace_graph_ret *trace,
963 unsigned long flags, int pc);
964
965#ifdef CONFIG_DYNAMIC_FTRACE
966extern struct ftrace_hash __rcu *ftrace_graph_hash;
967extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
968
969static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
970{
971 unsigned long addr = trace->func;
972 int ret = 0;
973 struct ftrace_hash *hash;
974
975 preempt_disable_notrace();
976
977 /*
978 * Have to open code "rcu_dereference_sched()" because the
979 * function graph tracer can be called when RCU is not
980 * "watching".
981 * Protected with schedule_on_each_cpu(ftrace_sync)
982 */
983 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
984
985 if (ftrace_hash_empty(hash)) {
986 ret = 1;
987 goto out;
988 }
989
990 if (ftrace_lookup_ip(hash, addr)) {
991
992 /*
993 * This needs to be cleared on the return functions
994 * when the depth is zero.
995 */
996 trace_recursion_set(TRACE_GRAPH_BIT);
997 trace_recursion_set_depth(trace->depth);
998
999 /*
1000 * If no irqs are to be traced, but a set_graph_function
1001 * is set, and called by an interrupt handler, we still
1002 * want to trace it.
1003 */
1004 if (in_irq())
1005 trace_recursion_set(TRACE_IRQ_BIT);
1006 else
1007 trace_recursion_clear(TRACE_IRQ_BIT);
1008 ret = 1;
1009 }
1010
1011out:
1012 preempt_enable_notrace();
1013 return ret;
1014}
1015
1016static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
1017{
1018 if (trace_recursion_test(TRACE_GRAPH_BIT) &&
1019 trace->depth == trace_recursion_depth())
1020 trace_recursion_clear(TRACE_GRAPH_BIT);
1021}
1022
1023static inline int ftrace_graph_notrace_addr(unsigned long addr)
1024{
1025 int ret = 0;
1026 struct ftrace_hash *notrace_hash;
1027
1028 preempt_disable_notrace();
1029
1030 /*
1031 * Have to open code "rcu_dereference_sched()" because the
1032 * function graph tracer can be called when RCU is not
1033 * "watching".
1034 * Protected with schedule_on_each_cpu(ftrace_sync)
1035 */
1036 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
1037 !preemptible());
1038
1039 if (ftrace_lookup_ip(notrace_hash, addr))
1040 ret = 1;
1041
1042 preempt_enable_notrace();
1043 return ret;
1044}
1045#else
1046static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
1047{
1048 return 1;
1049}
1050
1051static inline int ftrace_graph_notrace_addr(unsigned long addr)
1052{
1053 return 0;
1054}
1055static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
1056{ }
1057#endif /* CONFIG_DYNAMIC_FTRACE */
1058
1059extern unsigned int fgraph_max_depth;
1060
1061static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
1062{
1063 /* trace it when it is-nested-in or is a function enabled. */
1064 return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
1065 ftrace_graph_addr(trace)) ||
1066 (trace->depth < 0) ||
1067 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
1068}
1069
1070#else /* CONFIG_FUNCTION_GRAPH_TRACER */
1071static inline enum print_line_t
1072print_graph_function_flags(struct trace_iterator *iter, u32 flags)
1073{
1074 return TRACE_TYPE_UNHANDLED;
1075}
1076#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
1077
1078extern struct list_head ftrace_pids;
1079
1080#ifdef CONFIG_FUNCTION_TRACER
1081struct ftrace_func_command {
1082 struct list_head list;
1083 char *name;
1084 int (*func)(struct trace_array *tr,
1085 struct ftrace_hash *hash,
1086 char *func, char *cmd,
1087 char *params, int enable);
1088};
1089extern bool ftrace_filter_param __initdata;
1090static inline int ftrace_trace_task(struct trace_array *tr)
1091{
1092 return !this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid);
1093}
1094extern int ftrace_is_dead(void);
1095int ftrace_create_function_files(struct trace_array *tr,
1096 struct dentry *parent);
1097void ftrace_destroy_function_files(struct trace_array *tr);
1098void ftrace_init_global_array_ops(struct trace_array *tr);
1099void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
1100void ftrace_reset_array_ops(struct trace_array *tr);
1101void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
1102void ftrace_init_tracefs_toplevel(struct trace_array *tr,
1103 struct dentry *d_tracer);
1104void ftrace_clear_pids(struct trace_array *tr);
1105int init_function_trace(void);
1106void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
1107#else
1108static inline int ftrace_trace_task(struct trace_array *tr)
1109{
1110 return 1;
1111}
1112static inline int ftrace_is_dead(void) { return 0; }
1113static inline int
1114ftrace_create_function_files(struct trace_array *tr,
1115 struct dentry *parent)
1116{
1117 return 0;
1118}
1119static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1120static inline __init void
1121ftrace_init_global_array_ops(struct trace_array *tr) { }
1122static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1123static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
1124static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
1125static inline void ftrace_clear_pids(struct trace_array *tr) { }
1126static inline int init_function_trace(void) { return 0; }
1127static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1128/* ftace_func_t type is not defined, use macro instead of static inline */
1129#define ftrace_init_array_ops(tr, func) do { } while (0)
1130#endif /* CONFIG_FUNCTION_TRACER */
1131
1132#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1133
1134struct ftrace_probe_ops {
1135 void (*func)(unsigned long ip,
1136 unsigned long parent_ip,
1137 struct trace_array *tr,
1138 struct ftrace_probe_ops *ops,
1139 void *data);
1140 int (*init)(struct ftrace_probe_ops *ops,
1141 struct trace_array *tr,
1142 unsigned long ip, void *init_data,
1143 void **data);
1144 void (*free)(struct ftrace_probe_ops *ops,
1145 struct trace_array *tr,
1146 unsigned long ip, void *data);
1147 int (*print)(struct seq_file *m,
1148 unsigned long ip,
1149 struct ftrace_probe_ops *ops,
1150 void *data);
1151};
1152
1153struct ftrace_func_mapper;
1154typedef int (*ftrace_mapper_func)(void *data);
1155
1156struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1157void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1158 unsigned long ip);
1159int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1160 unsigned long ip, void *data);
1161void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1162 unsigned long ip);
1163void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1164 ftrace_mapper_func free_func);
1165
1166extern int
1167register_ftrace_function_probe(char *glob, struct trace_array *tr,
1168 struct ftrace_probe_ops *ops, void *data);
1169extern int
1170unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1171 struct ftrace_probe_ops *ops);
1172extern void clear_ftrace_function_probes(struct trace_array *tr);
1173
1174int register_ftrace_command(struct ftrace_func_command *cmd);
1175int unregister_ftrace_command(struct ftrace_func_command *cmd);
1176
1177void ftrace_create_filter_files(struct ftrace_ops *ops,
1178 struct dentry *parent);
1179void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1180
1181extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
1182 int len, int reset);
1183extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
1184 int len, int reset);
1185#else
1186struct ftrace_func_command;
1187
1188static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1189{
1190 return -EINVAL;
1191}
1192static inline __init int unregister_ftrace_command(char *cmd_name)
1193{
1194 return -EINVAL;
1195}
1196static inline void clear_ftrace_function_probes(struct trace_array *tr)
1197{
1198}
1199
1200/*
1201 * The ops parameter passed in is usually undefined.
1202 * This must be a macro.
1203 */
1204#define ftrace_create_filter_files(ops, parent) do { } while (0)
1205#define ftrace_destroy_filter_files(ops) do { } while (0)
1206#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1207
1208bool ftrace_event_is_function(struct trace_event_call *call);
1209
1210/*
1211 * struct trace_parser - servers for reading the user input separated by spaces
1212 * @cont: set if the input is not complete - no final space char was found
1213 * @buffer: holds the parsed user input
1214 * @idx: user input length
1215 * @size: buffer size
1216 */
1217struct trace_parser {
1218 bool cont;
1219 char *buffer;
1220 unsigned idx;
1221 unsigned size;
1222};
1223
1224static inline bool trace_parser_loaded(struct trace_parser *parser)
1225{
1226 return (parser->idx != 0);
1227}
1228
1229static inline bool trace_parser_cont(struct trace_parser *parser)
1230{
1231 return parser->cont;
1232}
1233
1234static inline void trace_parser_clear(struct trace_parser *parser)
1235{
1236 parser->cont = false;
1237 parser->idx = 0;
1238}
1239
1240extern int trace_parser_get_init(struct trace_parser *parser, int size);
1241extern void trace_parser_put(struct trace_parser *parser);
1242extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1243 size_t cnt, loff_t *ppos);
1244
1245/*
1246 * Only create function graph options if function graph is configured.
1247 */
1248#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1249# define FGRAPH_FLAGS \
1250 C(DISPLAY_GRAPH, "display-graph"),
1251#else
1252# define FGRAPH_FLAGS
1253#endif
1254
1255#ifdef CONFIG_BRANCH_TRACER
1256# define BRANCH_FLAGS \
1257 C(BRANCH, "branch"),
1258#else
1259# define BRANCH_FLAGS
1260#endif
1261
1262#ifdef CONFIG_FUNCTION_TRACER
1263# define FUNCTION_FLAGS \
1264 C(FUNCTION, "function-trace"), \
1265 C(FUNC_FORK, "function-fork"),
1266# define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1267#else
1268# define FUNCTION_FLAGS
1269# define FUNCTION_DEFAULT_FLAGS 0UL
1270# define TRACE_ITER_FUNC_FORK 0UL
1271#endif
1272
1273#ifdef CONFIG_STACKTRACE
1274# define STACK_FLAGS \
1275 C(STACKTRACE, "stacktrace"),
1276#else
1277# define STACK_FLAGS
1278#endif
1279
1280/*
1281 * trace_iterator_flags is an enumeration that defines bit
1282 * positions into trace_flags that controls the output.
1283 *
1284 * NOTE: These bits must match the trace_options array in
1285 * trace.c (this macro guarantees it).
1286 */
1287#define TRACE_FLAGS \
1288 C(PRINT_PARENT, "print-parent"), \
1289 C(SYM_OFFSET, "sym-offset"), \
1290 C(SYM_ADDR, "sym-addr"), \
1291 C(VERBOSE, "verbose"), \
1292 C(RAW, "raw"), \
1293 C(HEX, "hex"), \
1294 C(BIN, "bin"), \
1295 C(BLOCK, "block"), \
1296 C(PRINTK, "trace_printk"), \
1297 C(ANNOTATE, "annotate"), \
1298 C(USERSTACKTRACE, "userstacktrace"), \
1299 C(SYM_USEROBJ, "sym-userobj"), \
1300 C(PRINTK_MSGONLY, "printk-msg-only"), \
1301 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1302 C(LATENCY_FMT, "latency-format"), \
1303 C(RECORD_CMD, "record-cmd"), \
1304 C(RECORD_TGID, "record-tgid"), \
1305 C(OVERWRITE, "overwrite"), \
1306 C(STOP_ON_FREE, "disable_on_free"), \
1307 C(IRQ_INFO, "irq-info"), \
1308 C(MARKERS, "markers"), \
1309 C(EVENT_FORK, "event-fork"), \
1310 FUNCTION_FLAGS \
1311 FGRAPH_FLAGS \
1312 STACK_FLAGS \
1313 BRANCH_FLAGS
1314
1315/*
1316 * By defining C, we can make TRACE_FLAGS a list of bit names
1317 * that will define the bits for the flag masks.
1318 */
1319#undef C
1320#define C(a, b) TRACE_ITER_##a##_BIT
1321
1322enum trace_iterator_bits {
1323 TRACE_FLAGS
1324 /* Make sure we don't go more than we have bits for */
1325 TRACE_ITER_LAST_BIT
1326};
1327
1328/*
1329 * By redefining C, we can make TRACE_FLAGS a list of masks that
1330 * use the bits as defined above.
1331 */
1332#undef C
1333#define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1334
1335enum trace_iterator_flags { TRACE_FLAGS };
1336
1337/*
1338 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1339 * control the output of kernel symbols.
1340 */
1341#define TRACE_ITER_SYM_MASK \
1342 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1343
1344extern struct tracer nop_trace;
1345
1346#ifdef CONFIG_BRANCH_TRACER
1347extern int enable_branch_tracing(struct trace_array *tr);
1348extern void disable_branch_tracing(void);
1349static inline int trace_branch_enable(struct trace_array *tr)
1350{
1351 if (tr->trace_flags & TRACE_ITER_BRANCH)
1352 return enable_branch_tracing(tr);
1353 return 0;
1354}
1355static inline void trace_branch_disable(void)
1356{
1357 /* due to races, always disable */
1358 disable_branch_tracing();
1359}
1360#else
1361static inline int trace_branch_enable(struct trace_array *tr)
1362{
1363 return 0;
1364}
1365static inline void trace_branch_disable(void)
1366{
1367}
1368#endif /* CONFIG_BRANCH_TRACER */
1369
1370/* set ring buffers to default size if not already done so */
1371int tracing_update_buffers(void);
1372
1373struct ftrace_event_field {
1374 struct list_head link;
1375 const char *name;
1376 const char *type;
1377 int filter_type;
1378 int offset;
1379 int size;
1380 int is_signed;
1381};
1382
1383struct prog_entry;
1384
1385struct event_filter {
1386 struct prog_entry __rcu *prog;
1387 char *filter_string;
1388};
1389
1390struct event_subsystem {
1391 struct list_head list;
1392 const char *name;
1393 struct event_filter *filter;
1394 int ref_count;
1395};
1396
1397struct trace_subsystem_dir {
1398 struct list_head list;
1399 struct event_subsystem *subsystem;
1400 struct trace_array *tr;
1401 struct dentry *entry;
1402 int ref_count;
1403 int nr_events;
1404};
1405
1406extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1407 struct trace_buffer *buffer,
1408 struct ring_buffer_event *event);
1409
1410void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1411 struct trace_buffer *buffer,
1412 struct ring_buffer_event *event,
1413 unsigned long flags, int pc,
1414 struct pt_regs *regs);
1415
1416static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1417 struct trace_buffer *buffer,
1418 struct ring_buffer_event *event,
1419 unsigned long flags, int pc)
1420{
1421 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
1422}
1423
1424DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1425DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1426void trace_buffered_event_disable(void);
1427void trace_buffered_event_enable(void);
1428
1429static inline void
1430__trace_event_discard_commit(struct trace_buffer *buffer,
1431 struct ring_buffer_event *event)
1432{
1433 if (this_cpu_read(trace_buffered_event) == event) {
1434 /* Simply release the temp buffer */
1435 this_cpu_dec(trace_buffered_event_cnt);
1436 return;
1437 }
1438 ring_buffer_discard_commit(buffer, event);
1439}
1440
1441/*
1442 * Helper function for event_trigger_unlock_commit{_regs}().
1443 * If there are event triggers attached to this event that requires
1444 * filtering against its fields, then they wil be called as the
1445 * entry already holds the field information of the current event.
1446 *
1447 * It also checks if the event should be discarded or not.
1448 * It is to be discarded if the event is soft disabled and the
1449 * event was only recorded to process triggers, or if the event
1450 * filter is active and this event did not match the filters.
1451 *
1452 * Returns true if the event is discarded, false otherwise.
1453 */
1454static inline bool
1455__event_trigger_test_discard(struct trace_event_file *file,
1456 struct trace_buffer *buffer,
1457 struct ring_buffer_event *event,
1458 void *entry,
1459 enum event_trigger_type *tt)
1460{
1461 unsigned long eflags = file->flags;
1462
1463 if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1464 *tt = event_triggers_call(file, entry, event);
1465
1466 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1467 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1468 !filter_match_preds(file->filter, entry))) {
1469 __trace_event_discard_commit(buffer, event);
1470 return true;
1471 }
1472
1473 return false;
1474}
1475
1476/**
1477 * event_trigger_unlock_commit - handle triggers and finish event commit
1478 * @file: The file pointer assoctiated to the event
1479 * @buffer: The ring buffer that the event is being written to
1480 * @event: The event meta data in the ring buffer
1481 * @entry: The event itself
1482 * @irq_flags: The state of the interrupts at the start of the event
1483 * @pc: The state of the preempt count at the start of the event.
1484 *
1485 * This is a helper function to handle triggers that require data
1486 * from the event itself. It also tests the event against filters and
1487 * if the event is soft disabled and should be discarded.
1488 */
1489static inline void
1490event_trigger_unlock_commit(struct trace_event_file *file,
1491 struct trace_buffer *buffer,
1492 struct ring_buffer_event *event,
1493 void *entry, unsigned long irq_flags, int pc)
1494{
1495 enum event_trigger_type tt = ETT_NONE;
1496
1497 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1498 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
1499
1500 if (tt)
1501 event_triggers_post_call(file, tt);
1502}
1503
1504/**
1505 * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1506 * @file: The file pointer assoctiated to the event
1507 * @buffer: The ring buffer that the event is being written to
1508 * @event: The event meta data in the ring buffer
1509 * @entry: The event itself
1510 * @irq_flags: The state of the interrupts at the start of the event
1511 * @pc: The state of the preempt count at the start of the event.
1512 *
1513 * This is a helper function to handle triggers that require data
1514 * from the event itself. It also tests the event against filters and
1515 * if the event is soft disabled and should be discarded.
1516 *
1517 * Same as event_trigger_unlock_commit() but calls
1518 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1519 */
1520static inline void
1521event_trigger_unlock_commit_regs(struct trace_event_file *file,
1522 struct trace_buffer *buffer,
1523 struct ring_buffer_event *event,
1524 void *entry, unsigned long irq_flags, int pc,
1525 struct pt_regs *regs)
1526{
1527 enum event_trigger_type tt = ETT_NONE;
1528
1529 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1530 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1531 irq_flags, pc, regs);
1532
1533 if (tt)
1534 event_triggers_post_call(file, tt);
1535}
1536
1537#define FILTER_PRED_INVALID ((unsigned short)-1)
1538#define FILTER_PRED_IS_RIGHT (1 << 15)
1539#define FILTER_PRED_FOLD (1 << 15)
1540
1541/*
1542 * The max preds is the size of unsigned short with
1543 * two flags at the MSBs. One bit is used for both the IS_RIGHT
1544 * and FOLD flags. The other is reserved.
1545 *
1546 * 2^14 preds is way more than enough.
1547 */
1548#define MAX_FILTER_PRED 16384
1549
1550struct filter_pred;
1551struct regex;
1552
1553typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1554
1555typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1556
1557enum regex_type {
1558 MATCH_FULL = 0,
1559 MATCH_FRONT_ONLY,
1560 MATCH_MIDDLE_ONLY,
1561 MATCH_END_ONLY,
1562 MATCH_GLOB,
1563 MATCH_INDEX,
1564};
1565
1566struct regex {
1567 char pattern[MAX_FILTER_STR_VAL];
1568 int len;
1569 int field_len;
1570 regex_match_func match;
1571};
1572
1573struct filter_pred {
1574 filter_pred_fn_t fn;
1575 u64 val;
1576 struct regex regex;
1577 unsigned short *ops;
1578 struct ftrace_event_field *field;
1579 int offset;
1580 int not;
1581 int op;
1582};
1583
1584static inline bool is_string_field(struct ftrace_event_field *field)
1585{
1586 return field->filter_type == FILTER_DYN_STRING ||
1587 field->filter_type == FILTER_STATIC_STRING ||
1588 field->filter_type == FILTER_PTR_STRING ||
1589 field->filter_type == FILTER_COMM;
1590}
1591
1592static inline bool is_function_field(struct ftrace_event_field *field)
1593{
1594 return field->filter_type == FILTER_TRACE_FN;
1595}
1596
1597extern enum regex_type
1598filter_parse_regex(char *buff, int len, char **search, int *not);
1599extern void print_event_filter(struct trace_event_file *file,
1600 struct trace_seq *s);
1601extern int apply_event_filter(struct trace_event_file *file,
1602 char *filter_string);
1603extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1604 char *filter_string);
1605extern void print_subsystem_event_filter(struct event_subsystem *system,
1606 struct trace_seq *s);
1607extern int filter_assign_type(const char *type);
1608extern int create_event_filter(struct trace_array *tr,
1609 struct trace_event_call *call,
1610 char *filter_str, bool set_str,
1611 struct event_filter **filterp);
1612extern void free_event_filter(struct event_filter *filter);
1613
1614struct ftrace_event_field *
1615trace_find_event_field(struct trace_event_call *call, char *name);
1616
1617extern void trace_event_enable_cmd_record(bool enable);
1618extern void trace_event_enable_tgid_record(bool enable);
1619
1620extern int event_trace_init(void);
1621extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1622extern int event_trace_del_tracer(struct trace_array *tr);
1623
1624extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1625 const char *system,
1626 const char *event);
1627extern struct trace_event_file *find_event_file(struct trace_array *tr,
1628 const char *system,
1629 const char *event);
1630
1631static inline void *event_file_data(struct file *filp)
1632{
1633 return READ_ONCE(file_inode(filp)->i_private);
1634}
1635
1636extern struct mutex event_mutex;
1637extern struct list_head ftrace_events;
1638
1639extern const struct file_operations event_trigger_fops;
1640extern const struct file_operations event_hist_fops;
1641extern const struct file_operations event_inject_fops;
1642
1643#ifdef CONFIG_HIST_TRIGGERS
1644extern int register_trigger_hist_cmd(void);
1645extern int register_trigger_hist_enable_disable_cmds(void);
1646#else
1647static inline int register_trigger_hist_cmd(void) { return 0; }
1648static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1649#endif
1650
1651extern int register_trigger_cmds(void);
1652extern void clear_event_triggers(struct trace_array *tr);
1653
1654struct event_trigger_data {
1655 unsigned long count;
1656 int ref;
1657 struct event_trigger_ops *ops;
1658 struct event_command *cmd_ops;
1659 struct event_filter __rcu *filter;
1660 char *filter_str;
1661 void *private_data;
1662 bool paused;
1663 bool paused_tmp;
1664 struct list_head list;
1665 char *name;
1666 struct list_head named_list;
1667 struct event_trigger_data *named_data;
1668};
1669
1670/* Avoid typos */
1671#define ENABLE_EVENT_STR "enable_event"
1672#define DISABLE_EVENT_STR "disable_event"
1673#define ENABLE_HIST_STR "enable_hist"
1674#define DISABLE_HIST_STR "disable_hist"
1675
1676struct enable_trigger_data {
1677 struct trace_event_file *file;
1678 bool enable;
1679 bool hist;
1680};
1681
1682extern int event_enable_trigger_print(struct seq_file *m,
1683 struct event_trigger_ops *ops,
1684 struct event_trigger_data *data);
1685extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1686 struct event_trigger_data *data);
1687extern int event_enable_trigger_func(struct event_command *cmd_ops,
1688 struct trace_event_file *file,
1689 char *glob, char *cmd, char *param);
1690extern int event_enable_register_trigger(char *glob,
1691 struct event_trigger_ops *ops,
1692 struct event_trigger_data *data,
1693 struct trace_event_file *file);
1694extern void event_enable_unregister_trigger(char *glob,
1695 struct event_trigger_ops *ops,
1696 struct event_trigger_data *test,
1697 struct trace_event_file *file);
1698extern void trigger_data_free(struct event_trigger_data *data);
1699extern int event_trigger_init(struct event_trigger_ops *ops,
1700 struct event_trigger_data *data);
1701extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1702 int trigger_enable);
1703extern void update_cond_flag(struct trace_event_file *file);
1704extern int set_trigger_filter(char *filter_str,
1705 struct event_trigger_data *trigger_data,
1706 struct trace_event_file *file);
1707extern struct event_trigger_data *find_named_trigger(const char *name);
1708extern bool is_named_trigger(struct event_trigger_data *test);
1709extern int save_named_trigger(const char *name,
1710 struct event_trigger_data *data);
1711extern void del_named_trigger(struct event_trigger_data *data);
1712extern void pause_named_trigger(struct event_trigger_data *data);
1713extern void unpause_named_trigger(struct event_trigger_data *data);
1714extern void set_named_trigger_data(struct event_trigger_data *data,
1715 struct event_trigger_data *named_data);
1716extern struct event_trigger_data *
1717get_named_trigger_data(struct event_trigger_data *data);
1718extern int register_event_command(struct event_command *cmd);
1719extern int unregister_event_command(struct event_command *cmd);
1720extern int register_trigger_hist_enable_disable_cmds(void);
1721
1722/**
1723 * struct event_trigger_ops - callbacks for trace event triggers
1724 *
1725 * The methods in this structure provide per-event trigger hooks for
1726 * various trigger operations.
1727 *
1728 * All the methods below, except for @init() and @free(), must be
1729 * implemented.
1730 *
1731 * @func: The trigger 'probe' function called when the triggering
1732 * event occurs. The data passed into this callback is the data
1733 * that was supplied to the event_command @reg() function that
1734 * registered the trigger (see struct event_command) along with
1735 * the trace record, rec.
1736 *
1737 * @init: An optional initialization function called for the trigger
1738 * when the trigger is registered (via the event_command reg()
1739 * function). This can be used to perform per-trigger
1740 * initialization such as incrementing a per-trigger reference
1741 * count, for instance. This is usually implemented by the
1742 * generic utility function @event_trigger_init() (see
1743 * trace_event_triggers.c).
1744 *
1745 * @free: An optional de-initialization function called for the
1746 * trigger when the trigger is unregistered (via the
1747 * event_command @reg() function). This can be used to perform
1748 * per-trigger de-initialization such as decrementing a
1749 * per-trigger reference count and freeing corresponding trigger
1750 * data, for instance. This is usually implemented by the
1751 * generic utility function @event_trigger_free() (see
1752 * trace_event_triggers.c).
1753 *
1754 * @print: The callback function invoked to have the trigger print
1755 * itself. This is usually implemented by a wrapper function
1756 * that calls the generic utility function @event_trigger_print()
1757 * (see trace_event_triggers.c).
1758 */
1759struct event_trigger_ops {
1760 void (*func)(struct event_trigger_data *data,
1761 void *rec,
1762 struct ring_buffer_event *rbe);
1763 int (*init)(struct event_trigger_ops *ops,
1764 struct event_trigger_data *data);
1765 void (*free)(struct event_trigger_ops *ops,
1766 struct event_trigger_data *data);
1767 int (*print)(struct seq_file *m,
1768 struct event_trigger_ops *ops,
1769 struct event_trigger_data *data);
1770};
1771
1772/**
1773 * struct event_command - callbacks and data members for event commands
1774 *
1775 * Event commands are invoked by users by writing the command name
1776 * into the 'trigger' file associated with a trace event. The
1777 * parameters associated with a specific invocation of an event
1778 * command are used to create an event trigger instance, which is
1779 * added to the list of trigger instances associated with that trace
1780 * event. When the event is hit, the set of triggers associated with
1781 * that event is invoked.
1782 *
1783 * The data members in this structure provide per-event command data
1784 * for various event commands.
1785 *
1786 * All the data members below, except for @post_trigger, must be set
1787 * for each event command.
1788 *
1789 * @name: The unique name that identifies the event command. This is
1790 * the name used when setting triggers via trigger files.
1791 *
1792 * @trigger_type: A unique id that identifies the event command
1793 * 'type'. This value has two purposes, the first to ensure that
1794 * only one trigger of the same type can be set at a given time
1795 * for a particular event e.g. it doesn't make sense to have both
1796 * a traceon and traceoff trigger attached to a single event at
1797 * the same time, so traceon and traceoff have the same type
1798 * though they have different names. The @trigger_type value is
1799 * also used as a bit value for deferring the actual trigger
1800 * action until after the current event is finished. Some
1801 * commands need to do this if they themselves log to the trace
1802 * buffer (see the @post_trigger() member below). @trigger_type
1803 * values are defined by adding new values to the trigger_type
1804 * enum in include/linux/trace_events.h.
1805 *
1806 * @flags: See the enum event_command_flags below.
1807 *
1808 * All the methods below, except for @set_filter() and @unreg_all(),
1809 * must be implemented.
1810 *
1811 * @func: The callback function responsible for parsing and
1812 * registering the trigger written to the 'trigger' file by the
1813 * user. It allocates the trigger instance and registers it with
1814 * the appropriate trace event. It makes use of the other
1815 * event_command callback functions to orchestrate this, and is
1816 * usually implemented by the generic utility function
1817 * @event_trigger_callback() (see trace_event_triggers.c).
1818 *
1819 * @reg: Adds the trigger to the list of triggers associated with the
1820 * event, and enables the event trigger itself, after
1821 * initializing it (via the event_trigger_ops @init() function).
1822 * This is also where commands can use the @trigger_type value to
1823 * make the decision as to whether or not multiple instances of
1824 * the trigger should be allowed. This is usually implemented by
1825 * the generic utility function @register_trigger() (see
1826 * trace_event_triggers.c).
1827 *
1828 * @unreg: Removes the trigger from the list of triggers associated
1829 * with the event, and disables the event trigger itself, after
1830 * initializing it (via the event_trigger_ops @free() function).
1831 * This is usually implemented by the generic utility function
1832 * @unregister_trigger() (see trace_event_triggers.c).
1833 *
1834 * @unreg_all: An optional function called to remove all the triggers
1835 * from the list of triggers associated with the event. Called
1836 * when a trigger file is opened in truncate mode.
1837 *
1838 * @set_filter: An optional function called to parse and set a filter
1839 * for the trigger. If no @set_filter() method is set for the
1840 * event command, filters set by the user for the command will be
1841 * ignored. This is usually implemented by the generic utility
1842 * function @set_trigger_filter() (see trace_event_triggers.c).
1843 *
1844 * @get_trigger_ops: The callback function invoked to retrieve the
1845 * event_trigger_ops implementation associated with the command.
1846 */
1847struct event_command {
1848 struct list_head list;
1849 char *name;
1850 enum event_trigger_type trigger_type;
1851 int flags;
1852 int (*func)(struct event_command *cmd_ops,
1853 struct trace_event_file *file,
1854 char *glob, char *cmd, char *params);
1855 int (*reg)(char *glob,
1856 struct event_trigger_ops *ops,
1857 struct event_trigger_data *data,
1858 struct trace_event_file *file);
1859 void (*unreg)(char *glob,
1860 struct event_trigger_ops *ops,
1861 struct event_trigger_data *data,
1862 struct trace_event_file *file);
1863 void (*unreg_all)(struct trace_event_file *file);
1864 int (*set_filter)(char *filter_str,
1865 struct event_trigger_data *data,
1866 struct trace_event_file *file);
1867 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1868};
1869
1870/**
1871 * enum event_command_flags - flags for struct event_command
1872 *
1873 * @POST_TRIGGER: A flag that says whether or not this command needs
1874 * to have its action delayed until after the current event has
1875 * been closed. Some triggers need to avoid being invoked while
1876 * an event is currently in the process of being logged, since
1877 * the trigger may itself log data into the trace buffer. Thus
1878 * we make sure the current event is committed before invoking
1879 * those triggers. To do that, the trigger invocation is split
1880 * in two - the first part checks the filter using the current
1881 * trace record; if a command has the @post_trigger flag set, it
1882 * sets a bit for itself in the return value, otherwise it
1883 * directly invokes the trigger. Once all commands have been
1884 * either invoked or set their return flag, the current record is
1885 * either committed or discarded. At that point, if any commands
1886 * have deferred their triggers, those commands are finally
1887 * invoked following the close of the current event. In other
1888 * words, if the event_trigger_ops @func() probe implementation
1889 * itself logs to the trace buffer, this flag should be set,
1890 * otherwise it can be left unspecified.
1891 *
1892 * @NEEDS_REC: A flag that says whether or not this command needs
1893 * access to the trace record in order to perform its function,
1894 * regardless of whether or not it has a filter associated with
1895 * it (filters make a trigger require access to the trace record
1896 * but are not always present).
1897 */
1898enum event_command_flags {
1899 EVENT_CMD_FL_POST_TRIGGER = 1,
1900 EVENT_CMD_FL_NEEDS_REC = 2,
1901};
1902
1903static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1904{
1905 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1906}
1907
1908static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1909{
1910 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1911}
1912
1913extern int trace_event_enable_disable(struct trace_event_file *file,
1914 int enable, int soft_disable);
1915extern int tracing_alloc_snapshot(void);
1916extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1917extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1918
1919extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1920extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1921
1922extern const char *__start___trace_bprintk_fmt[];
1923extern const char *__stop___trace_bprintk_fmt[];
1924
1925extern const char *__start___tracepoint_str[];
1926extern const char *__stop___tracepoint_str[];
1927
1928void trace_printk_control(bool enabled);
1929void trace_printk_start_comm(void);
1930int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1931int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1932
1933/* Used from boot time tracer */
1934extern int trace_set_options(struct trace_array *tr, char *option);
1935extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
1936extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
1937 unsigned long size, int cpu_id);
1938extern int tracing_set_cpumask(struct trace_array *tr,
1939 cpumask_var_t tracing_cpumask_new);
1940
1941
1942#define MAX_EVENT_NAME_LEN 64
1943
1944extern int trace_run_command(const char *buf, int (*createfn)(int, char**));
1945extern ssize_t trace_parse_run_command(struct file *file,
1946 const char __user *buffer, size_t count, loff_t *ppos,
1947 int (*createfn)(int, char**));
1948
1949extern unsigned int err_pos(char *cmd, const char *str);
1950extern void tracing_log_err(struct trace_array *tr,
1951 const char *loc, const char *cmd,
1952 const char **errs, u8 type, u8 pos);
1953
1954/*
1955 * Normal trace_printk() and friends allocates special buffers
1956 * to do the manipulation, as well as saves the print formats
1957 * into sections to display. But the trace infrastructure wants
1958 * to use these without the added overhead at the price of being
1959 * a bit slower (used mainly for warnings, where we don't care
1960 * about performance). The internal_trace_puts() is for such
1961 * a purpose.
1962 */
1963#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1964
1965#undef FTRACE_ENTRY
1966#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
1967 extern struct trace_event_call \
1968 __aligned(4) event_##call;
1969#undef FTRACE_ENTRY_DUP
1970#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
1971 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1972#undef FTRACE_ENTRY_PACKED
1973#define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \
1974 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1975
1976#include "trace_entries.h"
1977
1978#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1979int perf_ftrace_event_register(struct trace_event_call *call,
1980 enum trace_reg type, void *data);
1981#else
1982#define perf_ftrace_event_register NULL
1983#endif
1984
1985#ifdef CONFIG_FTRACE_SYSCALLS
1986void init_ftrace_syscalls(void);
1987const char *get_syscall_name(int syscall);
1988#else
1989static inline void init_ftrace_syscalls(void) { }
1990static inline const char *get_syscall_name(int syscall)
1991{
1992 return NULL;
1993}
1994#endif
1995
1996#ifdef CONFIG_EVENT_TRACING
1997void trace_event_init(void);
1998void trace_event_eval_update(struct trace_eval_map **map, int len);
1999/* Used from boot time tracer */
2000extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
2001extern int trigger_process_regex(struct trace_event_file *file, char *buff);
2002#else
2003static inline void __init trace_event_init(void) { }
2004static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
2005#endif
2006
2007#ifdef CONFIG_TRACER_SNAPSHOT
2008void tracing_snapshot_instance(struct trace_array *tr);
2009int tracing_alloc_snapshot_instance(struct trace_array *tr);
2010#else
2011static inline void tracing_snapshot_instance(struct trace_array *tr) { }
2012static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
2013{
2014 return 0;
2015}
2016#endif
2017
2018#ifdef CONFIG_PREEMPT_TRACER
2019void tracer_preempt_on(unsigned long a0, unsigned long a1);
2020void tracer_preempt_off(unsigned long a0, unsigned long a1);
2021#else
2022static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
2023static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
2024#endif
2025#ifdef CONFIG_IRQSOFF_TRACER
2026void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
2027void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
2028#else
2029static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
2030static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
2031#endif
2032
2033extern struct trace_iterator *tracepoint_print_iter;
2034
2035/*
2036 * Reset the state of the trace_iterator so that it can read consumed data.
2037 * Normally, the trace_iterator is used for reading the data when it is not
2038 * consumed, and must retain state.
2039 */
2040static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
2041{
2042 const size_t offset = offsetof(struct trace_iterator, seq);
2043
2044 /*
2045 * Keep gcc from complaining about overwriting more than just one
2046 * member in the structure.
2047 */
2048 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
2049
2050 iter->pos = -1;
2051}
2052
2053#endif /* _LINUX_KERNEL_TRACE_H */