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TOMOYO Linux Cross Reference
Linux/kernel/trace/trace.h

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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/hw_breakpoint.h>
 15 #include <linux/trace_seq.h>
 16 #include <linux/trace_events.h>
 17 #include <linux/compiler.h>
 18 #include <linux/trace_seq.h>
 19 #include <linux/glob.h>
 20 
 21 #ifdef CONFIG_FTRACE_SYSCALLS
 22 #include <asm/unistd.h>         /* For NR_SYSCALLS           */
 23 #include <asm/syscall.h>        /* some archs define it here */
 24 #endif
 25 
 26 enum trace_type {
 27         __TRACE_FIRST_TYPE = 0,
 28 
 29         TRACE_FN,
 30         TRACE_CTX,
 31         TRACE_WAKE,
 32         TRACE_STACK,
 33         TRACE_PRINT,
 34         TRACE_BPRINT,
 35         TRACE_MMIO_RW,
 36         TRACE_MMIO_MAP,
 37         TRACE_BRANCH,
 38         TRACE_GRAPH_RET,
 39         TRACE_GRAPH_ENT,
 40         TRACE_USER_STACK,
 41         TRACE_BLK,
 42         TRACE_BPUTS,
 43         TRACE_HWLAT,
 44         TRACE_RAW_DATA,
 45 
 46         __TRACE_LAST_TYPE,
 47 };
 48 
 49 
 50 #undef __field
 51 #define __field(type, item)             type    item;
 52 
 53 #undef __field_struct
 54 #define __field_struct(type, item)      __field(type, item)
 55 
 56 #undef __field_desc
 57 #define __field_desc(type, container, item)
 58 
 59 #undef __array
 60 #define __array(type, item, size)       type    item[size];
 61 
 62 #undef __array_desc
 63 #define __array_desc(type, container, item, size)
 64 
 65 #undef __dynamic_array
 66 #define __dynamic_array(type, item)     type    item[];
 67 
 68 #undef F_STRUCT
 69 #define F_STRUCT(args...)               args
 70 
 71 #undef FTRACE_ENTRY
 72 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter)     \
 73         struct struct_name {                                            \
 74                 struct trace_entry      ent;                            \
 75                 tstruct                                                 \
 76         }
 77 
 78 #undef FTRACE_ENTRY_DUP
 79 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
 80 
 81 #undef FTRACE_ENTRY_REG
 82 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
 83                          filter, regfn) \
 84         FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
 85                      filter)
 86 
 87 #undef FTRACE_ENTRY_PACKED
 88 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print,      \
 89                             filter)                                     \
 90         FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
 91                      filter) __packed
 92 
 93 #include "trace_entries.h"
 94 
 95 /*
 96  * syscalls are special, and need special handling, this is why
 97  * they are not included in trace_entries.h
 98  */
 99 struct syscall_trace_enter {
100         struct trace_entry      ent;
101         int                     nr;
102         unsigned long           args[];
103 };
104 
105 struct syscall_trace_exit {
106         struct trace_entry      ent;
107         int                     nr;
108         long                    ret;
109 };
110 
111 struct kprobe_trace_entry_head {
112         struct trace_entry      ent;
113         unsigned long           ip;
114 };
115 
116 struct kretprobe_trace_entry_head {
117         struct trace_entry      ent;
118         unsigned long           func;
119         unsigned long           ret_ip;
120 };
121 
122 /*
123  * trace_flag_type is an enumeration that holds different
124  * states when a trace occurs. These are:
125  *  IRQS_OFF            - interrupts were disabled
126  *  IRQS_NOSUPPORT      - arch does not support irqs_disabled_flags
127  *  NEED_RESCHED        - reschedule is requested
128  *  HARDIRQ             - inside an interrupt handler
129  *  SOFTIRQ             - inside a softirq handler
130  */
131 enum trace_flag_type {
132         TRACE_FLAG_IRQS_OFF             = 0x01,
133         TRACE_FLAG_IRQS_NOSUPPORT       = 0x02,
134         TRACE_FLAG_NEED_RESCHED         = 0x04,
135         TRACE_FLAG_HARDIRQ              = 0x08,
136         TRACE_FLAG_SOFTIRQ              = 0x10,
137         TRACE_FLAG_PREEMPT_RESCHED      = 0x20,
138         TRACE_FLAG_NMI                  = 0x40,
139 };
140 
141 #define TRACE_BUF_SIZE          1024
142 
143 struct trace_array;
144 
145 /*
146  * The CPU trace array - it consists of thousands of trace entries
147  * plus some other descriptor data: (for example which task started
148  * the trace, etc.)
149  */
150 struct trace_array_cpu {
151         atomic_t                disabled;
152         void                    *buffer_page;   /* ring buffer spare */
153 
154         unsigned long           entries;
155         unsigned long           saved_latency;
156         unsigned long           critical_start;
157         unsigned long           critical_end;
158         unsigned long           critical_sequence;
159         unsigned long           nice;
160         unsigned long           policy;
161         unsigned long           rt_priority;
162         unsigned long           skipped_entries;
163         u64                     preempt_timestamp;
164         pid_t                   pid;
165         kuid_t                  uid;
166         char                    comm[TASK_COMM_LEN];
167 
168         bool                    ignore_pid;
169 #ifdef CONFIG_FUNCTION_TRACER
170         bool                    ftrace_ignore_pid;
171 #endif
172 };
173 
174 struct tracer;
175 struct trace_option_dentry;
176 
177 struct trace_buffer {
178         struct trace_array              *tr;
179         struct ring_buffer              *buffer;
180         struct trace_array_cpu __percpu *data;
181         u64                             time_start;
182         int                             cpu;
183 };
184 
185 #define TRACE_FLAGS_MAX_SIZE            32
186 
187 struct trace_options {
188         struct tracer                   *tracer;
189         struct trace_option_dentry      *topts;
190 };
191 
192 struct trace_pid_list {
193         int                             pid_max;
194         unsigned long                   *pids;
195 };
196 
197 /*
198  * The trace array - an array of per-CPU trace arrays. This is the
199  * highest level data structure that individual tracers deal with.
200  * They have on/off state as well:
201  */
202 struct trace_array {
203         struct list_head        list;
204         char                    *name;
205         struct trace_buffer     trace_buffer;
206 #ifdef CONFIG_TRACER_MAX_TRACE
207         /*
208          * The max_buffer is used to snapshot the trace when a maximum
209          * latency is reached, or when the user initiates a snapshot.
210          * Some tracers will use this to store a maximum trace while
211          * it continues examining live traces.
212          *
213          * The buffers for the max_buffer are set up the same as the trace_buffer
214          * When a snapshot is taken, the buffer of the max_buffer is swapped
215          * with the buffer of the trace_buffer and the buffers are reset for
216          * the trace_buffer so the tracing can continue.
217          */
218         struct trace_buffer     max_buffer;
219         bool                    allocated_snapshot;
220 #endif
221 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
222         unsigned long           max_latency;
223 #endif
224         struct trace_pid_list   __rcu *filtered_pids;
225         /*
226          * max_lock is used to protect the swapping of buffers
227          * when taking a max snapshot. The buffers themselves are
228          * protected by per_cpu spinlocks. But the action of the swap
229          * needs its own lock.
230          *
231          * This is defined as a arch_spinlock_t in order to help
232          * with performance when lockdep debugging is enabled.
233          *
234          * It is also used in other places outside the update_max_tr
235          * so it needs to be defined outside of the
236          * CONFIG_TRACER_MAX_TRACE.
237          */
238         arch_spinlock_t         max_lock;
239         int                     buffer_disabled;
240 #ifdef CONFIG_FTRACE_SYSCALLS
241         int                     sys_refcount_enter;
242         int                     sys_refcount_exit;
243         struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
244         struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
245 #endif
246         int                     stop_count;
247         int                     clock_id;
248         int                     nr_topts;
249         bool                    clear_trace;
250         struct tracer           *current_trace;
251         unsigned int            trace_flags;
252         unsigned char           trace_flags_index[TRACE_FLAGS_MAX_SIZE];
253         unsigned int            flags;
254         raw_spinlock_t          start_lock;
255         struct dentry           *dir;
256         struct dentry           *options;
257         struct dentry           *percpu_dir;
258         struct dentry           *event_dir;
259         struct trace_options    *topts;
260         struct list_head        systems;
261         struct list_head        events;
262         struct trace_event_file *trace_marker_file;
263         cpumask_var_t           tracing_cpumask; /* only trace on set CPUs */
264         int                     ref;
265 #ifdef CONFIG_FUNCTION_TRACER
266         struct ftrace_ops       *ops;
267         struct trace_pid_list   __rcu *function_pids;
268 #ifdef CONFIG_DYNAMIC_FTRACE
269         /* All of these are protected by the ftrace_lock */
270         struct list_head        func_probes;
271         struct list_head        mod_trace;
272         struct list_head        mod_notrace;
273 #endif
274         /* function tracing enabled */
275         int                     function_enabled;
276 #endif
277         int                     time_stamp_abs_ref;
278         struct list_head        hist_vars;
279 };
280 
281 enum {
282         TRACE_ARRAY_FL_GLOBAL   = (1 << 0)
283 };
284 
285 extern struct list_head ftrace_trace_arrays;
286 
287 extern struct mutex trace_types_lock;
288 
289 extern int trace_array_get(struct trace_array *tr);
290 extern void trace_array_put(struct trace_array *tr);
291 
292 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs);
293 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
294 
295 extern bool trace_clock_in_ns(struct trace_array *tr);
296 
297 /*
298  * The global tracer (top) should be the first trace array added,
299  * but we check the flag anyway.
300  */
301 static inline struct trace_array *top_trace_array(void)
302 {
303         struct trace_array *tr;
304 
305         if (list_empty(&ftrace_trace_arrays))
306                 return NULL;
307 
308         tr = list_entry(ftrace_trace_arrays.prev,
309                         typeof(*tr), list);
310         WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
311         return tr;
312 }
313 
314 #define FTRACE_CMP_TYPE(var, type) \
315         __builtin_types_compatible_p(typeof(var), type *)
316 
317 #undef IF_ASSIGN
318 #define IF_ASSIGN(var, entry, etype, id)                \
319         if (FTRACE_CMP_TYPE(var, etype)) {              \
320                 var = (typeof(var))(entry);             \
321                 WARN_ON(id && (entry)->type != id);     \
322                 break;                                  \
323         }
324 
325 /* Will cause compile errors if type is not found. */
326 extern void __ftrace_bad_type(void);
327 
328 /*
329  * The trace_assign_type is a verifier that the entry type is
330  * the same as the type being assigned. To add new types simply
331  * add a line with the following format:
332  *
333  * IF_ASSIGN(var, ent, type, id);
334  *
335  *  Where "type" is the trace type that includes the trace_entry
336  *  as the "ent" item. And "id" is the trace identifier that is
337  *  used in the trace_type enum.
338  *
339  *  If the type can have more than one id, then use zero.
340  */
341 #define trace_assign_type(var, ent)                                     \
342         do {                                                            \
343                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
344                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
345                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
346                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
347                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
348                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
349                 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS);   \
350                 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT);   \
351                 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
352                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
353                           TRACE_MMIO_RW);                               \
354                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
355                           TRACE_MMIO_MAP);                              \
356                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
357                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
358                           TRACE_GRAPH_ENT);             \
359                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
360                           TRACE_GRAPH_RET);             \
361                 __ftrace_bad_type();                                    \
362         } while (0)
363 
364 /*
365  * An option specific to a tracer. This is a boolean value.
366  * The bit is the bit index that sets its value on the
367  * flags value in struct tracer_flags.
368  */
369 struct tracer_opt {
370         const char      *name; /* Will appear on the trace_options file */
371         u32             bit; /* Mask assigned in val field in tracer_flags */
372 };
373 
374 /*
375  * The set of specific options for a tracer. Your tracer
376  * have to set the initial value of the flags val.
377  */
378 struct tracer_flags {
379         u32                     val;
380         struct tracer_opt       *opts;
381         struct tracer           *trace;
382 };
383 
384 /* Makes more easy to define a tracer opt */
385 #define TRACER_OPT(s, b)        .name = #s, .bit = b
386 
387 
388 struct trace_option_dentry {
389         struct tracer_opt               *opt;
390         struct tracer_flags             *flags;
391         struct trace_array              *tr;
392         struct dentry                   *entry;
393 };
394 
395 /**
396  * struct tracer - a specific tracer and its callbacks to interact with tracefs
397  * @name: the name chosen to select it on the available_tracers file
398  * @init: called when one switches to this tracer (echo name > current_tracer)
399  * @reset: called when one switches to another tracer
400  * @start: called when tracing is unpaused (echo 1 > tracing_on)
401  * @stop: called when tracing is paused (echo 0 > tracing_on)
402  * @update_thresh: called when tracing_thresh is updated
403  * @open: called when the trace file is opened
404  * @pipe_open: called when the trace_pipe file is opened
405  * @close: called when the trace file is released
406  * @pipe_close: called when the trace_pipe file is released
407  * @read: override the default read callback on trace_pipe
408  * @splice_read: override the default splice_read callback on trace_pipe
409  * @selftest: selftest to run on boot (see trace_selftest.c)
410  * @print_headers: override the first lines that describe your columns
411  * @print_line: callback that prints a trace
412  * @set_flag: signals one of your private flags changed (trace_options file)
413  * @flags: your private flags
414  */
415 struct tracer {
416         const char              *name;
417         int                     (*init)(struct trace_array *tr);
418         void                    (*reset)(struct trace_array *tr);
419         void                    (*start)(struct trace_array *tr);
420         void                    (*stop)(struct trace_array *tr);
421         int                     (*update_thresh)(struct trace_array *tr);
422         void                    (*open)(struct trace_iterator *iter);
423         void                    (*pipe_open)(struct trace_iterator *iter);
424         void                    (*close)(struct trace_iterator *iter);
425         void                    (*pipe_close)(struct trace_iterator *iter);
426         ssize_t                 (*read)(struct trace_iterator *iter,
427                                         struct file *filp, char __user *ubuf,
428                                         size_t cnt, loff_t *ppos);
429         ssize_t                 (*splice_read)(struct trace_iterator *iter,
430                                                struct file *filp,
431                                                loff_t *ppos,
432                                                struct pipe_inode_info *pipe,
433                                                size_t len,
434                                                unsigned int flags);
435 #ifdef CONFIG_FTRACE_STARTUP_TEST
436         int                     (*selftest)(struct tracer *trace,
437                                             struct trace_array *tr);
438 #endif
439         void                    (*print_header)(struct seq_file *m);
440         enum print_line_t       (*print_line)(struct trace_iterator *iter);
441         /* If you handled the flag setting, return 0 */
442         int                     (*set_flag)(struct trace_array *tr,
443                                             u32 old_flags, u32 bit, int set);
444         /* Return 0 if OK with change, else return non-zero */
445         int                     (*flag_changed)(struct trace_array *tr,
446                                                 u32 mask, int set);
447         struct tracer           *next;
448         struct tracer_flags     *flags;
449         int                     enabled;
450         int                     ref;
451         bool                    print_max;
452         bool                    allow_instances;
453 #ifdef CONFIG_TRACER_MAX_TRACE
454         bool                    use_max_tr;
455 #endif
456         /* True if tracer cannot be enabled in kernel param */
457         bool                    noboot;
458 };
459 
460 
461 /* Only current can touch trace_recursion */
462 
463 /*
464  * For function tracing recursion:
465  *  The order of these bits are important.
466  *
467  *  When function tracing occurs, the following steps are made:
468  *   If arch does not support a ftrace feature:
469  *    call internal function (uses INTERNAL bits) which calls...
470  *   If callback is registered to the "global" list, the list
471  *    function is called and recursion checks the GLOBAL bits.
472  *    then this function calls...
473  *   The function callback, which can use the FTRACE bits to
474  *    check for recursion.
475  *
476  * Now if the arch does not suppport a feature, and it calls
477  * the global list function which calls the ftrace callback
478  * all three of these steps will do a recursion protection.
479  * There's no reason to do one if the previous caller already
480  * did. The recursion that we are protecting against will
481  * go through the same steps again.
482  *
483  * To prevent the multiple recursion checks, if a recursion
484  * bit is set that is higher than the MAX bit of the current
485  * check, then we know that the check was made by the previous
486  * caller, and we can skip the current check.
487  */
488 enum {
489         TRACE_BUFFER_BIT,
490         TRACE_BUFFER_NMI_BIT,
491         TRACE_BUFFER_IRQ_BIT,
492         TRACE_BUFFER_SIRQ_BIT,
493 
494         /* Start of function recursion bits */
495         TRACE_FTRACE_BIT,
496         TRACE_FTRACE_NMI_BIT,
497         TRACE_FTRACE_IRQ_BIT,
498         TRACE_FTRACE_SIRQ_BIT,
499 
500         /* INTERNAL_BITs must be greater than FTRACE_BITs */
501         TRACE_INTERNAL_BIT,
502         TRACE_INTERNAL_NMI_BIT,
503         TRACE_INTERNAL_IRQ_BIT,
504         TRACE_INTERNAL_SIRQ_BIT,
505 
506         TRACE_BRANCH_BIT,
507 /*
508  * Abuse of the trace_recursion.
509  * As we need a way to maintain state if we are tracing the function
510  * graph in irq because we want to trace a particular function that
511  * was called in irq context but we have irq tracing off. Since this
512  * can only be modified by current, we can reuse trace_recursion.
513  */
514         TRACE_IRQ_BIT,
515 
516         /* Set if the function is in the set_graph_function file */
517         TRACE_GRAPH_BIT,
518 
519         /*
520          * In the very unlikely case that an interrupt came in
521          * at a start of graph tracing, and we want to trace
522          * the function in that interrupt, the depth can be greater
523          * than zero, because of the preempted start of a previous
524          * trace. In an even more unlikely case, depth could be 2
525          * if a softirq interrupted the start of graph tracing,
526          * followed by an interrupt preempting a start of graph
527          * tracing in the softirq, and depth can even be 3
528          * if an NMI came in at the start of an interrupt function
529          * that preempted a softirq start of a function that
530          * preempted normal context!!!! Luckily, it can't be
531          * greater than 3, so the next two bits are a mask
532          * of what the depth is when we set TRACE_GRAPH_BIT
533          */
534 
535         TRACE_GRAPH_DEPTH_START_BIT,
536         TRACE_GRAPH_DEPTH_END_BIT,
537 };
538 
539 #define trace_recursion_set(bit)        do { (current)->trace_recursion |= (1<<(bit)); } while (0)
540 #define trace_recursion_clear(bit)      do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
541 #define trace_recursion_test(bit)       ((current)->trace_recursion & (1<<(bit)))
542 
543 #define trace_recursion_depth() \
544         (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3)
545 #define trace_recursion_set_depth(depth) \
546         do {                                                            \
547                 current->trace_recursion &=                             \
548                         ~(3 << TRACE_GRAPH_DEPTH_START_BIT);            \
549                 current->trace_recursion |=                             \
550                         ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT;   \
551         } while (0)
552 
553 #define TRACE_CONTEXT_BITS      4
554 
555 #define TRACE_FTRACE_START      TRACE_FTRACE_BIT
556 #define TRACE_FTRACE_MAX        ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
557 
558 #define TRACE_LIST_START        TRACE_INTERNAL_BIT
559 #define TRACE_LIST_MAX          ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
560 
561 #define TRACE_CONTEXT_MASK      TRACE_LIST_MAX
562 
563 static __always_inline int trace_get_context_bit(void)
564 {
565         int bit;
566 
567         if (in_interrupt()) {
568                 if (in_nmi())
569                         bit = 0;
570 
571                 else if (in_irq())
572                         bit = 1;
573                 else
574                         bit = 2;
575         } else
576                 bit = 3;
577 
578         return bit;
579 }
580 
581 static __always_inline int trace_test_and_set_recursion(int start, int max)
582 {
583         unsigned int val = current->trace_recursion;
584         int bit;
585 
586         /* A previous recursion check was made */
587         if ((val & TRACE_CONTEXT_MASK) > max)
588                 return 0;
589 
590         bit = trace_get_context_bit() + start;
591         if (unlikely(val & (1 << bit)))
592                 return -1;
593 
594         val |= 1 << bit;
595         current->trace_recursion = val;
596         barrier();
597 
598         return bit;
599 }
600 
601 static __always_inline void trace_clear_recursion(int bit)
602 {
603         unsigned int val = current->trace_recursion;
604 
605         if (!bit)
606                 return;
607 
608         bit = 1 << bit;
609         val &= ~bit;
610 
611         barrier();
612         current->trace_recursion = val;
613 }
614 
615 static inline struct ring_buffer_iter *
616 trace_buffer_iter(struct trace_iterator *iter, int cpu)
617 {
618         return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
619 }
620 
621 int tracer_init(struct tracer *t, struct trace_array *tr);
622 int tracing_is_enabled(void);
623 void tracing_reset(struct trace_buffer *buf, int cpu);
624 void tracing_reset_online_cpus(struct trace_buffer *buf);
625 void tracing_reset_current(int cpu);
626 void tracing_reset_all_online_cpus(void);
627 int tracing_open_generic(struct inode *inode, struct file *filp);
628 bool tracing_is_disabled(void);
629 bool tracer_tracing_is_on(struct trace_array *tr);
630 void tracer_tracing_on(struct trace_array *tr);
631 void tracer_tracing_off(struct trace_array *tr);
632 struct dentry *trace_create_file(const char *name,
633                                  umode_t mode,
634                                  struct dentry *parent,
635                                  void *data,
636                                  const struct file_operations *fops);
637 
638 struct dentry *tracing_init_dentry(void);
639 
640 struct ring_buffer_event;
641 
642 struct ring_buffer_event *
643 trace_buffer_lock_reserve(struct ring_buffer *buffer,
644                           int type,
645                           unsigned long len,
646                           unsigned long flags,
647                           int pc);
648 
649 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
650                                                 struct trace_array_cpu *data);
651 
652 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
653                                           int *ent_cpu, u64 *ent_ts);
654 
655 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer,
656                                         struct ring_buffer_event *event);
657 
658 int trace_empty(struct trace_iterator *iter);
659 
660 void *trace_find_next_entry_inc(struct trace_iterator *iter);
661 
662 void trace_init_global_iter(struct trace_iterator *iter);
663 
664 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
665 
666 void trace_function(struct trace_array *tr,
667                     unsigned long ip,
668                     unsigned long parent_ip,
669                     unsigned long flags, int pc);
670 void trace_graph_function(struct trace_array *tr,
671                     unsigned long ip,
672                     unsigned long parent_ip,
673                     unsigned long flags, int pc);
674 void trace_latency_header(struct seq_file *m);
675 void trace_default_header(struct seq_file *m);
676 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
677 int trace_empty(struct trace_iterator *iter);
678 
679 void trace_graph_return(struct ftrace_graph_ret *trace);
680 int trace_graph_entry(struct ftrace_graph_ent *trace);
681 void set_graph_array(struct trace_array *tr);
682 
683 void tracing_start_cmdline_record(void);
684 void tracing_stop_cmdline_record(void);
685 void tracing_start_tgid_record(void);
686 void tracing_stop_tgid_record(void);
687 
688 int register_tracer(struct tracer *type);
689 int is_tracing_stopped(void);
690 
691 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
692 
693 extern cpumask_var_t __read_mostly tracing_buffer_mask;
694 
695 #define for_each_tracing_cpu(cpu)       \
696         for_each_cpu(cpu, tracing_buffer_mask)
697 
698 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
699 
700 extern unsigned long tracing_thresh;
701 
702 /* PID filtering */
703 
704 extern int pid_max;
705 
706 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
707                              pid_t search_pid);
708 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
709                             struct task_struct *task);
710 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
711                                   struct task_struct *self,
712                                   struct task_struct *task);
713 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
714 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
715 int trace_pid_show(struct seq_file *m, void *v);
716 void trace_free_pid_list(struct trace_pid_list *pid_list);
717 int trace_pid_write(struct trace_pid_list *filtered_pids,
718                     struct trace_pid_list **new_pid_list,
719                     const char __user *ubuf, size_t cnt);
720 
721 #ifdef CONFIG_TRACER_MAX_TRACE
722 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
723 void update_max_tr_single(struct trace_array *tr,
724                           struct task_struct *tsk, int cpu);
725 #endif /* CONFIG_TRACER_MAX_TRACE */
726 
727 #ifdef CONFIG_STACKTRACE
728 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
729                             int pc);
730 
731 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
732                    int pc);
733 #else
734 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
735                                           unsigned long flags, int pc)
736 {
737 }
738 
739 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
740                                  int skip, int pc)
741 {
742 }
743 #endif /* CONFIG_STACKTRACE */
744 
745 extern u64 ftrace_now(int cpu);
746 
747 extern void trace_find_cmdline(int pid, char comm[]);
748 extern int trace_find_tgid(int pid);
749 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
750 
751 #ifdef CONFIG_DYNAMIC_FTRACE
752 extern unsigned long ftrace_update_tot_cnt;
753 void ftrace_init_trace_array(struct trace_array *tr);
754 #else
755 static inline void ftrace_init_trace_array(struct trace_array *tr) { }
756 #endif
757 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
758 extern int DYN_FTRACE_TEST_NAME(void);
759 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
760 extern int DYN_FTRACE_TEST_NAME2(void);
761 
762 extern bool ring_buffer_expanded;
763 extern bool tracing_selftest_disabled;
764 
765 #ifdef CONFIG_FTRACE_STARTUP_TEST
766 extern int trace_selftest_startup_function(struct tracer *trace,
767                                            struct trace_array *tr);
768 extern int trace_selftest_startup_function_graph(struct tracer *trace,
769                                                  struct trace_array *tr);
770 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
771                                           struct trace_array *tr);
772 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
773                                              struct trace_array *tr);
774 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
775                                                  struct trace_array *tr);
776 extern int trace_selftest_startup_wakeup(struct tracer *trace,
777                                          struct trace_array *tr);
778 extern int trace_selftest_startup_nop(struct tracer *trace,
779                                          struct trace_array *tr);
780 extern int trace_selftest_startup_branch(struct tracer *trace,
781                                          struct trace_array *tr);
782 /*
783  * Tracer data references selftest functions that only occur
784  * on boot up. These can be __init functions. Thus, when selftests
785  * are enabled, then the tracers need to reference __init functions.
786  */
787 #define __tracer_data           __refdata
788 #else
789 /* Tracers are seldom changed. Optimize when selftests are disabled. */
790 #define __tracer_data           __read_mostly
791 #endif /* CONFIG_FTRACE_STARTUP_TEST */
792 
793 extern void *head_page(struct trace_array_cpu *data);
794 extern unsigned long long ns2usecs(u64 nsec);
795 extern int
796 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
797 extern int
798 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
799 extern int
800 trace_array_vprintk(struct trace_array *tr,
801                     unsigned long ip, const char *fmt, va_list args);
802 int trace_array_printk(struct trace_array *tr,
803                        unsigned long ip, const char *fmt, ...);
804 int trace_array_printk_buf(struct ring_buffer *buffer,
805                            unsigned long ip, const char *fmt, ...);
806 void trace_printk_seq(struct trace_seq *s);
807 enum print_line_t print_trace_line(struct trace_iterator *iter);
808 
809 extern char trace_find_mark(unsigned long long duration);
810 
811 struct ftrace_hash;
812 
813 struct ftrace_mod_load {
814         struct list_head        list;
815         char                    *func;
816         char                    *module;
817         int                      enable;
818 };
819 
820 enum {
821         FTRACE_HASH_FL_MOD      = (1 << 0),
822 };
823 
824 struct ftrace_hash {
825         unsigned long           size_bits;
826         struct hlist_head       *buckets;
827         unsigned long           count;
828         unsigned long           flags;
829         struct rcu_head         rcu;
830 };
831 
832 struct ftrace_func_entry *
833 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
834 
835 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
836 {
837         return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
838 }
839 
840 /* Standard output formatting function used for function return traces */
841 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
842 
843 /* Flag options */
844 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
845 #define TRACE_GRAPH_PRINT_CPU           0x2
846 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
847 #define TRACE_GRAPH_PRINT_PROC          0x8
848 #define TRACE_GRAPH_PRINT_DURATION      0x10
849 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
850 #define TRACE_GRAPH_PRINT_IRQS          0x40
851 #define TRACE_GRAPH_PRINT_TAIL          0x80
852 #define TRACE_GRAPH_SLEEP_TIME          0x100
853 #define TRACE_GRAPH_GRAPH_TIME          0x200
854 #define TRACE_GRAPH_PRINT_FILL_SHIFT    28
855 #define TRACE_GRAPH_PRINT_FILL_MASK     (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
856 
857 extern void ftrace_graph_sleep_time_control(bool enable);
858 extern void ftrace_graph_graph_time_control(bool enable);
859 
860 extern enum print_line_t
861 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
862 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
863 extern void
864 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
865 extern void graph_trace_open(struct trace_iterator *iter);
866 extern void graph_trace_close(struct trace_iterator *iter);
867 extern int __trace_graph_entry(struct trace_array *tr,
868                                struct ftrace_graph_ent *trace,
869                                unsigned long flags, int pc);
870 extern void __trace_graph_return(struct trace_array *tr,
871                                  struct ftrace_graph_ret *trace,
872                                  unsigned long flags, int pc);
873 
874 #ifdef CONFIG_DYNAMIC_FTRACE
875 extern struct ftrace_hash *ftrace_graph_hash;
876 extern struct ftrace_hash *ftrace_graph_notrace_hash;
877 
878 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
879 {
880         unsigned long addr = trace->func;
881         int ret = 0;
882 
883         preempt_disable_notrace();
884 
885         if (ftrace_hash_empty(ftrace_graph_hash)) {
886                 ret = 1;
887                 goto out;
888         }
889 
890         if (ftrace_lookup_ip(ftrace_graph_hash, addr)) {
891 
892                 /*
893                  * This needs to be cleared on the return functions
894                  * when the depth is zero.
895                  */
896                 trace_recursion_set(TRACE_GRAPH_BIT);
897                 trace_recursion_set_depth(trace->depth);
898 
899                 /*
900                  * If no irqs are to be traced, but a set_graph_function
901                  * is set, and called by an interrupt handler, we still
902                  * want to trace it.
903                  */
904                 if (in_irq())
905                         trace_recursion_set(TRACE_IRQ_BIT);
906                 else
907                         trace_recursion_clear(TRACE_IRQ_BIT);
908                 ret = 1;
909         }
910 
911 out:
912         preempt_enable_notrace();
913         return ret;
914 }
915 
916 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
917 {
918         if (trace_recursion_test(TRACE_GRAPH_BIT) &&
919             trace->depth == trace_recursion_depth())
920                 trace_recursion_clear(TRACE_GRAPH_BIT);
921 }
922 
923 static inline int ftrace_graph_notrace_addr(unsigned long addr)
924 {
925         int ret = 0;
926 
927         preempt_disable_notrace();
928 
929         if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr))
930                 ret = 1;
931 
932         preempt_enable_notrace();
933         return ret;
934 }
935 #else
936 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
937 {
938         return 1;
939 }
940 
941 static inline int ftrace_graph_notrace_addr(unsigned long addr)
942 {
943         return 0;
944 }
945 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
946 { }
947 #endif /* CONFIG_DYNAMIC_FTRACE */
948 
949 extern unsigned int fgraph_max_depth;
950 
951 static 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 */
961 static inline enum print_line_t
962 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
963 {
964         return TRACE_TYPE_UNHANDLED;
965 }
966 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
967 
968 extern struct list_head ftrace_pids;
969 
970 #ifdef CONFIG_FUNCTION_TRACER
971 struct ftrace_func_command {
972         struct list_head        list;
973         char                    *name;
974         int                     (*func)(struct trace_array *tr,
975                                         struct ftrace_hash *hash,
976                                         char *func, char *cmd,
977                                         char *params, int enable);
978 };
979 extern bool ftrace_filter_param __initdata;
980 static inline int ftrace_trace_task(struct trace_array *tr)
981 {
982         return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid);
983 }
984 extern int ftrace_is_dead(void);
985 int ftrace_create_function_files(struct trace_array *tr,
986                                  struct dentry *parent);
987 void ftrace_destroy_function_files(struct trace_array *tr);
988 void ftrace_init_global_array_ops(struct trace_array *tr);
989 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
990 void ftrace_reset_array_ops(struct trace_array *tr);
991 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
992 void ftrace_init_tracefs_toplevel(struct trace_array *tr,
993                                   struct dentry *d_tracer);
994 void ftrace_clear_pids(struct trace_array *tr);
995 int init_function_trace(void);
996 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
997 #else
998 static inline int ftrace_trace_task(struct trace_array *tr)
999 {
1000         return 1;
1001 }
1002 static inline int ftrace_is_dead(void) { return 0; }
1003 static inline int
1004 ftrace_create_function_files(struct trace_array *tr,
1005                              struct dentry *parent)
1006 {
1007         return 0;
1008 }
1009 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
1010 static inline __init void
1011 ftrace_init_global_array_ops(struct trace_array *tr) { }
1012 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
1013 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
1014 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
1015 static inline void ftrace_clear_pids(struct trace_array *tr) { }
1016 static inline int init_function_trace(void) { return 0; }
1017 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
1018 /* ftace_func_t type is not defined, use macro instead of static inline */
1019 #define ftrace_init_array_ops(tr, func) do { } while (0)
1020 #endif /* CONFIG_FUNCTION_TRACER */
1021 
1022 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
1023 
1024 struct ftrace_probe_ops {
1025         void                    (*func)(unsigned long ip,
1026                                         unsigned long parent_ip,
1027                                         struct trace_array *tr,
1028                                         struct ftrace_probe_ops *ops,
1029                                         void *data);
1030         int                     (*init)(struct ftrace_probe_ops *ops,
1031                                         struct trace_array *tr,
1032                                         unsigned long ip, void *init_data,
1033                                         void **data);
1034         void                    (*free)(struct ftrace_probe_ops *ops,
1035                                         struct trace_array *tr,
1036                                         unsigned long ip, void *data);
1037         int                     (*print)(struct seq_file *m,
1038                                          unsigned long ip,
1039                                          struct ftrace_probe_ops *ops,
1040                                          void *data);
1041 };
1042 
1043 struct ftrace_func_mapper;
1044 typedef int (*ftrace_mapper_func)(void *data);
1045 
1046 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1047 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1048                                            unsigned long ip);
1049 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1050                                unsigned long ip, void *data);
1051 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1052                                    unsigned long ip);
1053 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1054                              ftrace_mapper_func free_func);
1055 
1056 extern int
1057 register_ftrace_function_probe(char *glob, struct trace_array *tr,
1058                                struct ftrace_probe_ops *ops, void *data);
1059 extern int
1060 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1061                                       struct ftrace_probe_ops *ops);
1062 extern void clear_ftrace_function_probes(struct trace_array *tr);
1063 
1064 int register_ftrace_command(struct ftrace_func_command *cmd);
1065 int unregister_ftrace_command(struct ftrace_func_command *cmd);
1066 
1067 void ftrace_create_filter_files(struct ftrace_ops *ops,
1068                                 struct dentry *parent);
1069 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1070 #else
1071 struct ftrace_func_command;
1072 
1073 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1074 {
1075         return -EINVAL;
1076 }
1077 static inline __init int unregister_ftrace_command(char *cmd_name)
1078 {
1079         return -EINVAL;
1080 }
1081 static inline void clear_ftrace_function_probes(struct trace_array *tr)
1082 {
1083 }
1084 
1085 /*
1086  * The ops parameter passed in is usually undefined.
1087  * This must be a macro.
1088  */
1089 #define ftrace_create_filter_files(ops, parent) do { } while (0)
1090 #define ftrace_destroy_filter_files(ops) do { } while (0)
1091 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1092 
1093 bool ftrace_event_is_function(struct trace_event_call *call);
1094 
1095 /*
1096  * struct trace_parser - servers for reading the user input separated by spaces
1097  * @cont: set if the input is not complete - no final space char was found
1098  * @buffer: holds the parsed user input
1099  * @idx: user input length
1100  * @size: buffer size
1101  */
1102 struct trace_parser {
1103         bool            cont;
1104         char            *buffer;
1105         unsigned        idx;
1106         unsigned        size;
1107 };
1108 
1109 static inline bool trace_parser_loaded(struct trace_parser *parser)
1110 {
1111         return (parser->idx != 0);
1112 }
1113 
1114 static inline bool trace_parser_cont(struct trace_parser *parser)
1115 {
1116         return parser->cont;
1117 }
1118 
1119 static inline void trace_parser_clear(struct trace_parser *parser)
1120 {
1121         parser->cont = false;
1122         parser->idx = 0;
1123 }
1124 
1125 extern int trace_parser_get_init(struct trace_parser *parser, int size);
1126 extern void trace_parser_put(struct trace_parser *parser);
1127 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1128         size_t cnt, loff_t *ppos);
1129 
1130 /*
1131  * Only create function graph options if function graph is configured.
1132  */
1133 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1134 # define FGRAPH_FLAGS                                           \
1135                 C(DISPLAY_GRAPH,        "display-graph"),
1136 #else
1137 # define FGRAPH_FLAGS
1138 #endif
1139 
1140 #ifdef CONFIG_BRANCH_TRACER
1141 # define BRANCH_FLAGS                                   \
1142                 C(BRANCH,               "branch"),
1143 #else
1144 # define BRANCH_FLAGS
1145 #endif
1146 
1147 #ifdef CONFIG_FUNCTION_TRACER
1148 # define FUNCTION_FLAGS                                         \
1149                 C(FUNCTION,             "function-trace"),      \
1150                 C(FUNC_FORK,            "function-fork"),
1151 # define FUNCTION_DEFAULT_FLAGS         TRACE_ITER_FUNCTION
1152 #else
1153 # define FUNCTION_FLAGS
1154 # define FUNCTION_DEFAULT_FLAGS         0UL
1155 # define TRACE_ITER_FUNC_FORK           0UL
1156 #endif
1157 
1158 #ifdef CONFIG_STACKTRACE
1159 # define STACK_FLAGS                            \
1160                 C(STACKTRACE,           "stacktrace"),
1161 #else
1162 # define STACK_FLAGS
1163 #endif
1164 
1165 /*
1166  * trace_iterator_flags is an enumeration that defines bit
1167  * positions into trace_flags that controls the output.
1168  *
1169  * NOTE: These bits must match the trace_options array in
1170  *       trace.c (this macro guarantees it).
1171  */
1172 #define TRACE_FLAGS                                             \
1173                 C(PRINT_PARENT,         "print-parent"),        \
1174                 C(SYM_OFFSET,           "sym-offset"),          \
1175                 C(SYM_ADDR,             "sym-addr"),            \
1176                 C(VERBOSE,              "verbose"),             \
1177                 C(RAW,                  "raw"),                 \
1178                 C(HEX,                  "hex"),                 \
1179                 C(BIN,                  "bin"),                 \
1180                 C(BLOCK,                "block"),               \
1181                 C(PRINTK,               "trace_printk"),        \
1182                 C(ANNOTATE,             "annotate"),            \
1183                 C(USERSTACKTRACE,       "userstacktrace"),      \
1184                 C(SYM_USEROBJ,          "sym-userobj"),         \
1185                 C(PRINTK_MSGONLY,       "printk-msg-only"),     \
1186                 C(CONTEXT_INFO,         "context-info"),   /* Print pid/cpu/time */ \
1187                 C(LATENCY_FMT,          "latency-format"),      \
1188                 C(RECORD_CMD,           "record-cmd"),          \
1189                 C(RECORD_TGID,          "record-tgid"),         \
1190                 C(OVERWRITE,            "overwrite"),           \
1191                 C(STOP_ON_FREE,         "disable_on_free"),     \
1192                 C(IRQ_INFO,             "irq-info"),            \
1193                 C(MARKERS,              "markers"),             \
1194                 C(EVENT_FORK,           "event-fork"),          \
1195                 FUNCTION_FLAGS                                  \
1196                 FGRAPH_FLAGS                                    \
1197                 STACK_FLAGS                                     \
1198                 BRANCH_FLAGS
1199 
1200 /*
1201  * By defining C, we can make TRACE_FLAGS a list of bit names
1202  * that will define the bits for the flag masks.
1203  */
1204 #undef C
1205 #define C(a, b) TRACE_ITER_##a##_BIT
1206 
1207 enum trace_iterator_bits {
1208         TRACE_FLAGS
1209         /* Make sure we don't go more than we have bits for */
1210         TRACE_ITER_LAST_BIT
1211 };
1212 
1213 /*
1214  * By redefining C, we can make TRACE_FLAGS a list of masks that
1215  * use the bits as defined above.
1216  */
1217 #undef C
1218 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1219 
1220 enum trace_iterator_flags { TRACE_FLAGS };
1221 
1222 /*
1223  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1224  * control the output of kernel symbols.
1225  */
1226 #define TRACE_ITER_SYM_MASK \
1227         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1228 
1229 extern struct tracer nop_trace;
1230 
1231 #ifdef CONFIG_BRANCH_TRACER
1232 extern int enable_branch_tracing(struct trace_array *tr);
1233 extern void disable_branch_tracing(void);
1234 static inline int trace_branch_enable(struct trace_array *tr)
1235 {
1236         if (tr->trace_flags & TRACE_ITER_BRANCH)
1237                 return enable_branch_tracing(tr);
1238         return 0;
1239 }
1240 static inline void trace_branch_disable(void)
1241 {
1242         /* due to races, always disable */
1243         disable_branch_tracing();
1244 }
1245 #else
1246 static inline int trace_branch_enable(struct trace_array *tr)
1247 {
1248         return 0;
1249 }
1250 static inline void trace_branch_disable(void)
1251 {
1252 }
1253 #endif /* CONFIG_BRANCH_TRACER */
1254 
1255 /* set ring buffers to default size if not already done so */
1256 int tracing_update_buffers(void);
1257 
1258 struct ftrace_event_field {
1259         struct list_head        link;
1260         const char              *name;
1261         const char              *type;
1262         int                     filter_type;
1263         int                     offset;
1264         int                     size;
1265         int                     is_signed;
1266 };
1267 
1268 struct prog_entry;
1269 
1270 struct event_filter {
1271         struct prog_entry __rcu *prog;
1272         char                    *filter_string;
1273 };
1274 
1275 struct event_subsystem {
1276         struct list_head        list;
1277         const char              *name;
1278         struct event_filter     *filter;
1279         int                     ref_count;
1280 };
1281 
1282 struct trace_subsystem_dir {
1283         struct list_head                list;
1284         struct event_subsystem          *subsystem;
1285         struct trace_array              *tr;
1286         struct dentry                   *entry;
1287         int                             ref_count;
1288         int                             nr_events;
1289 };
1290 
1291 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1292                                      struct ring_buffer *buffer,
1293                                      struct ring_buffer_event *event);
1294 
1295 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1296                                      struct ring_buffer *buffer,
1297                                      struct ring_buffer_event *event,
1298                                      unsigned long flags, int pc,
1299                                      struct pt_regs *regs);
1300 
1301 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1302                                               struct ring_buffer *buffer,
1303                                               struct ring_buffer_event *event,
1304                                               unsigned long flags, int pc)
1305 {
1306         trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
1307 }
1308 
1309 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1310 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1311 void trace_buffered_event_disable(void);
1312 void trace_buffered_event_enable(void);
1313 
1314 static inline void
1315 __trace_event_discard_commit(struct ring_buffer *buffer,
1316                              struct ring_buffer_event *event)
1317 {
1318         if (this_cpu_read(trace_buffered_event) == event) {
1319                 /* Simply release the temp buffer */
1320                 this_cpu_dec(trace_buffered_event_cnt);
1321                 return;
1322         }
1323         ring_buffer_discard_commit(buffer, event);
1324 }
1325 
1326 /*
1327  * Helper function for event_trigger_unlock_commit{_regs}().
1328  * If there are event triggers attached to this event that requires
1329  * filtering against its fields, then they wil be called as the
1330  * entry already holds the field information of the current event.
1331  *
1332  * It also checks if the event should be discarded or not.
1333  * It is to be discarded if the event is soft disabled and the
1334  * event was only recorded to process triggers, or if the event
1335  * filter is active and this event did not match the filters.
1336  *
1337  * Returns true if the event is discarded, false otherwise.
1338  */
1339 static inline bool
1340 __event_trigger_test_discard(struct trace_event_file *file,
1341                              struct ring_buffer *buffer,
1342                              struct ring_buffer_event *event,
1343                              void *entry,
1344                              enum event_trigger_type *tt)
1345 {
1346         unsigned long eflags = file->flags;
1347 
1348         if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1349                 *tt = event_triggers_call(file, entry, event);
1350 
1351         if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1352             (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1353              !filter_match_preds(file->filter, entry))) {
1354                 __trace_event_discard_commit(buffer, event);
1355                 return true;
1356         }
1357 
1358         return false;
1359 }
1360 
1361 /**
1362  * event_trigger_unlock_commit - handle triggers and finish event commit
1363  * @file: The file pointer assoctiated to the event
1364  * @buffer: The ring buffer that the event is being written to
1365  * @event: The event meta data in the ring buffer
1366  * @entry: The event itself
1367  * @irq_flags: The state of the interrupts at the start of the event
1368  * @pc: The state of the preempt count at the start of the event.
1369  *
1370  * This is a helper function to handle triggers that require data
1371  * from the event itself. It also tests the event against filters and
1372  * if the event is soft disabled and should be discarded.
1373  */
1374 static inline void
1375 event_trigger_unlock_commit(struct trace_event_file *file,
1376                             struct ring_buffer *buffer,
1377                             struct ring_buffer_event *event,
1378                             void *entry, unsigned long irq_flags, int pc)
1379 {
1380         enum event_trigger_type tt = ETT_NONE;
1381 
1382         if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1383                 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
1384 
1385         if (tt)
1386                 event_triggers_post_call(file, tt);
1387 }
1388 
1389 /**
1390  * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1391  * @file: The file pointer assoctiated to the event
1392  * @buffer: The ring buffer that the event is being written to
1393  * @event: The event meta data in the ring buffer
1394  * @entry: The event itself
1395  * @irq_flags: The state of the interrupts at the start of the event
1396  * @pc: The state of the preempt count at the start of the event.
1397  *
1398  * This is a helper function to handle triggers that require data
1399  * from the event itself. It also tests the event against filters and
1400  * if the event is soft disabled and should be discarded.
1401  *
1402  * Same as event_trigger_unlock_commit() but calls
1403  * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1404  */
1405 static inline void
1406 event_trigger_unlock_commit_regs(struct trace_event_file *file,
1407                                  struct ring_buffer *buffer,
1408                                  struct ring_buffer_event *event,
1409                                  void *entry, unsigned long irq_flags, int pc,
1410                                  struct pt_regs *regs)
1411 {
1412         enum event_trigger_type tt = ETT_NONE;
1413 
1414         if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1415                 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1416                                                 irq_flags, pc, regs);
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 
1435 struct filter_pred;
1436 struct regex;
1437 
1438 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1439 
1440 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1441 
1442 enum regex_type {
1443         MATCH_FULL = 0,
1444         MATCH_FRONT_ONLY,
1445         MATCH_MIDDLE_ONLY,
1446         MATCH_END_ONLY,
1447         MATCH_GLOB,
1448 };
1449 
1450 struct regex {
1451         char                    pattern[MAX_FILTER_STR_VAL];
1452         int                     len;
1453         int                     field_len;
1454         regex_match_func        match;
1455 };
1456 
1457 struct filter_pred {
1458         filter_pred_fn_t        fn;
1459         u64                     val;
1460         struct regex            regex;
1461         unsigned short          *ops;
1462         struct ftrace_event_field *field;
1463         int                     offset;
1464         int                     not;
1465         int                     op;
1466 };
1467 
1468 static inline bool is_string_field(struct ftrace_event_field *field)
1469 {
1470         return field->filter_type == FILTER_DYN_STRING ||
1471                field->filter_type == FILTER_STATIC_STRING ||
1472                field->filter_type == FILTER_PTR_STRING ||
1473                field->filter_type == FILTER_COMM;
1474 }
1475 
1476 static inline bool is_function_field(struct ftrace_event_field *field)
1477 {
1478         return field->filter_type == FILTER_TRACE_FN;
1479 }
1480 
1481 extern enum regex_type
1482 filter_parse_regex(char *buff, int len, char **search, int *not);
1483 extern void print_event_filter(struct trace_event_file *file,
1484                                struct trace_seq *s);
1485 extern int apply_event_filter(struct trace_event_file *file,
1486                               char *filter_string);
1487 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1488                                         char *filter_string);
1489 extern void print_subsystem_event_filter(struct event_subsystem *system,
1490                                          struct trace_seq *s);
1491 extern int filter_assign_type(const char *type);
1492 extern int create_event_filter(struct trace_event_call *call,
1493                                char *filter_str, bool set_str,
1494                                struct event_filter **filterp);
1495 extern void free_event_filter(struct event_filter *filter);
1496 
1497 struct ftrace_event_field *
1498 trace_find_event_field(struct trace_event_call *call, char *name);
1499 
1500 extern void trace_event_enable_cmd_record(bool enable);
1501 extern void trace_event_enable_tgid_record(bool enable);
1502 
1503 extern int event_trace_init(void);
1504 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1505 extern int event_trace_del_tracer(struct trace_array *tr);
1506 
1507 extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1508                                                   const char *system,
1509                                                   const char *event);
1510 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1511                                                 const char *system,
1512                                                 const char *event);
1513 
1514 static inline void *event_file_data(struct file *filp)
1515 {
1516         return READ_ONCE(file_inode(filp)->i_private);
1517 }
1518 
1519 extern struct mutex event_mutex;
1520 extern struct list_head ftrace_events;
1521 
1522 extern const struct file_operations event_trigger_fops;
1523 extern const struct file_operations event_hist_fops;
1524 
1525 #ifdef CONFIG_HIST_TRIGGERS
1526 extern int register_trigger_hist_cmd(void);
1527 extern int register_trigger_hist_enable_disable_cmds(void);
1528 #else
1529 static inline int register_trigger_hist_cmd(void) { return 0; }
1530 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1531 #endif
1532 
1533 extern int register_trigger_cmds(void);
1534 extern void clear_event_triggers(struct trace_array *tr);
1535 
1536 struct event_trigger_data {
1537         unsigned long                   count;
1538         int                             ref;
1539         struct event_trigger_ops        *ops;
1540         struct event_command            *cmd_ops;
1541         struct event_filter __rcu       *filter;
1542         char                            *filter_str;
1543         void                            *private_data;
1544         bool                            paused;
1545         bool                            paused_tmp;
1546         struct list_head                list;
1547         char                            *name;
1548         struct list_head                named_list;
1549         struct event_trigger_data       *named_data;
1550 };
1551 
1552 /* Avoid typos */
1553 #define ENABLE_EVENT_STR        "enable_event"
1554 #define DISABLE_EVENT_STR       "disable_event"
1555 #define ENABLE_HIST_STR         "enable_hist"
1556 #define DISABLE_HIST_STR        "disable_hist"
1557 
1558 struct enable_trigger_data {
1559         struct trace_event_file         *file;
1560         bool                            enable;
1561         bool                            hist;
1562 };
1563 
1564 extern int event_enable_trigger_print(struct seq_file *m,
1565                                       struct event_trigger_ops *ops,
1566                                       struct event_trigger_data *data);
1567 extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1568                                       struct event_trigger_data *data);
1569 extern int event_enable_trigger_func(struct event_command *cmd_ops,
1570                                      struct trace_event_file *file,
1571                                      char *glob, char *cmd, char *param);
1572 extern int event_enable_register_trigger(char *glob,
1573                                          struct event_trigger_ops *ops,
1574                                          struct event_trigger_data *data,
1575                                          struct trace_event_file *file);
1576 extern void event_enable_unregister_trigger(char *glob,
1577                                             struct event_trigger_ops *ops,
1578                                             struct event_trigger_data *test,
1579                                             struct trace_event_file *file);
1580 extern void trigger_data_free(struct event_trigger_data *data);
1581 extern int event_trigger_init(struct event_trigger_ops *ops,
1582                               struct event_trigger_data *data);
1583 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1584                                               int trigger_enable);
1585 extern void update_cond_flag(struct trace_event_file *file);
1586 extern int set_trigger_filter(char *filter_str,
1587                               struct event_trigger_data *trigger_data,
1588                               struct trace_event_file *file);
1589 extern struct event_trigger_data *find_named_trigger(const char *name);
1590 extern bool is_named_trigger(struct event_trigger_data *test);
1591 extern int save_named_trigger(const char *name,
1592                               struct event_trigger_data *data);
1593 extern void del_named_trigger(struct event_trigger_data *data);
1594 extern void pause_named_trigger(struct event_trigger_data *data);
1595 extern void unpause_named_trigger(struct event_trigger_data *data);
1596 extern void set_named_trigger_data(struct event_trigger_data *data,
1597                                    struct event_trigger_data *named_data);
1598 extern struct event_trigger_data *
1599 get_named_trigger_data(struct event_trigger_data *data);
1600 extern int register_event_command(struct event_command *cmd);
1601 extern int unregister_event_command(struct event_command *cmd);
1602 extern int register_trigger_hist_enable_disable_cmds(void);
1603 
1604 /**
1605  * struct event_trigger_ops - callbacks for trace event triggers
1606  *
1607  * The methods in this structure provide per-event trigger hooks for
1608  * various trigger operations.
1609  *
1610  * All the methods below, except for @init() and @free(), must be
1611  * implemented.
1612  *
1613  * @func: The trigger 'probe' function called when the triggering
1614  *      event occurs.  The data passed into this callback is the data
1615  *      that was supplied to the event_command @reg() function that
1616  *      registered the trigger (see struct event_command) along with
1617  *      the trace record, rec.
1618  *
1619  * @init: An optional initialization function called for the trigger
1620  *      when the trigger is registered (via the event_command reg()
1621  *      function).  This can be used to perform per-trigger
1622  *      initialization such as incrementing a per-trigger reference
1623  *      count, for instance.  This is usually implemented by the
1624  *      generic utility function @event_trigger_init() (see
1625  *      trace_event_triggers.c).
1626  *
1627  * @free: An optional de-initialization function called for the
1628  *      trigger when the trigger is unregistered (via the
1629  *      event_command @reg() function).  This can be used to perform
1630  *      per-trigger de-initialization such as decrementing a
1631  *      per-trigger reference count and freeing corresponding trigger
1632  *      data, for instance.  This is usually implemented by the
1633  *      generic utility function @event_trigger_free() (see
1634  *      trace_event_triggers.c).
1635  *
1636  * @print: The callback function invoked to have the trigger print
1637  *      itself.  This is usually implemented by a wrapper function
1638  *      that calls the generic utility function @event_trigger_print()
1639  *      (see trace_event_triggers.c).
1640  */
1641 struct event_trigger_ops {
1642         void                    (*func)(struct event_trigger_data *data,
1643                                         void *rec,
1644                                         struct ring_buffer_event *rbe);
1645         int                     (*init)(struct event_trigger_ops *ops,
1646                                         struct event_trigger_data *data);
1647         void                    (*free)(struct event_trigger_ops *ops,
1648                                         struct event_trigger_data *data);
1649         int                     (*print)(struct seq_file *m,
1650                                          struct event_trigger_ops *ops,
1651                                          struct event_trigger_data *data);
1652 };
1653 
1654 /**
1655  * struct event_command - callbacks and data members for event commands
1656  *
1657  * Event commands are invoked by users by writing the command name
1658  * into the 'trigger' file associated with a trace event.  The
1659  * parameters associated with a specific invocation of an event
1660  * command are used to create an event trigger instance, which is
1661  * added to the list of trigger instances associated with that trace
1662  * event.  When the event is hit, the set of triggers associated with
1663  * that event is invoked.
1664  *
1665  * The data members in this structure provide per-event command data
1666  * for various event commands.
1667  *
1668  * All the data members below, except for @post_trigger, must be set
1669  * for each event command.
1670  *
1671  * @name: The unique name that identifies the event command.  This is
1672  *      the name used when setting triggers via trigger files.
1673  *
1674  * @trigger_type: A unique id that identifies the event command
1675  *      'type'.  This value has two purposes, the first to ensure that
1676  *      only one trigger of the same type can be set at a given time
1677  *      for a particular event e.g. it doesn't make sense to have both
1678  *      a traceon and traceoff trigger attached to a single event at
1679  *      the same time, so traceon and traceoff have the same type
1680  *      though they have different names.  The @trigger_type value is
1681  *      also used as a bit value for deferring the actual trigger
1682  *      action until after the current event is finished.  Some
1683  *      commands need to do this if they themselves log to the trace
1684  *      buffer (see the @post_trigger() member below).  @trigger_type
1685  *      values are defined by adding new values to the trigger_type
1686  *      enum in include/linux/trace_events.h.
1687  *
1688  * @flags: See the enum event_command_flags below.
1689  *
1690  * All the methods below, except for @set_filter() and @unreg_all(),
1691  * must be implemented.
1692  *
1693  * @func: The callback function responsible for parsing and
1694  *      registering the trigger written to the 'trigger' file by the
1695  *      user.  It allocates the trigger instance and registers it with
1696  *      the appropriate trace event.  It makes use of the other
1697  *      event_command callback functions to orchestrate this, and is
1698  *      usually implemented by the generic utility function
1699  *      @event_trigger_callback() (see trace_event_triggers.c).
1700  *
1701  * @reg: Adds the trigger to the list of triggers associated with the
1702  *      event, and enables the event trigger itself, after
1703  *      initializing it (via the event_trigger_ops @init() function).
1704  *      This is also where commands can use the @trigger_type value to
1705  *      make the decision as to whether or not multiple instances of
1706  *      the trigger should be allowed.  This is usually implemented by
1707  *      the generic utility function @register_trigger() (see
1708  *      trace_event_triggers.c).
1709  *
1710  * @unreg: Removes the trigger from the list of triggers associated
1711  *      with the event, and disables the event trigger itself, after
1712  *      initializing it (via the event_trigger_ops @free() function).
1713  *      This is usually implemented by the generic utility function
1714  *      @unregister_trigger() (see trace_event_triggers.c).
1715  *
1716  * @unreg_all: An optional function called to remove all the triggers
1717  *      from the list of triggers associated with the event.  Called
1718  *      when a trigger file is opened in truncate mode.
1719  *
1720  * @set_filter: An optional function called to parse and set a filter
1721  *      for the trigger.  If no @set_filter() method is set for the
1722  *      event command, filters set by the user for the command will be
1723  *      ignored.  This is usually implemented by the generic utility
1724  *      function @set_trigger_filter() (see trace_event_triggers.c).
1725  *
1726  * @get_trigger_ops: The callback function invoked to retrieve the
1727  *      event_trigger_ops implementation associated with the command.
1728  */
1729 struct event_command {
1730         struct list_head        list;
1731         char                    *name;
1732         enum event_trigger_type trigger_type;
1733         int                     flags;
1734         int                     (*func)(struct event_command *cmd_ops,
1735                                         struct trace_event_file *file,
1736                                         char *glob, char *cmd, char *params);
1737         int                     (*reg)(char *glob,
1738                                        struct event_trigger_ops *ops,
1739                                        struct event_trigger_data *data,
1740                                        struct trace_event_file *file);
1741         void                    (*unreg)(char *glob,
1742                                          struct event_trigger_ops *ops,
1743                                          struct event_trigger_data *data,
1744                                          struct trace_event_file *file);
1745         void                    (*unreg_all)(struct trace_event_file *file);
1746         int                     (*set_filter)(char *filter_str,
1747                                               struct event_trigger_data *data,
1748                                               struct trace_event_file *file);
1749         struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1750 };
1751 
1752 /**
1753  * enum event_command_flags - flags for struct event_command
1754  *
1755  * @POST_TRIGGER: A flag that says whether or not this command needs
1756  *      to have its action delayed until after the current event has
1757  *      been closed.  Some triggers need to avoid being invoked while
1758  *      an event is currently in the process of being logged, since
1759  *      the trigger may itself log data into the trace buffer.  Thus
1760  *      we make sure the current event is committed before invoking
1761  *      those triggers.  To do that, the trigger invocation is split
1762  *      in two - the first part checks the filter using the current
1763  *      trace record; if a command has the @post_trigger flag set, it
1764  *      sets a bit for itself in the return value, otherwise it
1765  *      directly invokes the trigger.  Once all commands have been
1766  *      either invoked or set their return flag, the current record is
1767  *      either committed or discarded.  At that point, if any commands
1768  *      have deferred their triggers, those commands are finally
1769  *      invoked following the close of the current event.  In other
1770  *      words, if the event_trigger_ops @func() probe implementation
1771  *      itself logs to the trace buffer, this flag should be set,
1772  *      otherwise it can be left unspecified.
1773  *
1774  * @NEEDS_REC: A flag that says whether or not this command needs
1775  *      access to the trace record in order to perform its function,
1776  *      regardless of whether or not it has a filter associated with
1777  *      it (filters make a trigger require access to the trace record
1778  *      but are not always present).
1779  */
1780 enum event_command_flags {
1781         EVENT_CMD_FL_POST_TRIGGER       = 1,
1782         EVENT_CMD_FL_NEEDS_REC          = 2,
1783 };
1784 
1785 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1786 {
1787         return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1788 }
1789 
1790 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1791 {
1792         return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1793 }
1794 
1795 extern int trace_event_enable_disable(struct trace_event_file *file,
1796                                       int enable, int soft_disable);
1797 extern int tracing_alloc_snapshot(void);
1798 
1799 extern const char *__start___trace_bprintk_fmt[];
1800 extern const char *__stop___trace_bprintk_fmt[];
1801 
1802 extern const char *__start___tracepoint_str[];
1803 extern const char *__stop___tracepoint_str[];
1804 
1805 void trace_printk_control(bool enabled);
1806 void trace_printk_init_buffers(void);
1807 void trace_printk_start_comm(void);
1808 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1809 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1810 
1811 #define MAX_EVENT_NAME_LEN      64
1812 
1813 extern int trace_run_command(const char *buf, int (*createfn)(int, char**));
1814 extern ssize_t trace_parse_run_command(struct file *file,
1815                 const char __user *buffer, size_t count, loff_t *ppos,
1816                 int (*createfn)(int, char**));
1817 
1818 /*
1819  * Normal trace_printk() and friends allocates special buffers
1820  * to do the manipulation, as well as saves the print formats
1821  * into sections to display. But the trace infrastructure wants
1822  * to use these without the added overhead at the price of being
1823  * a bit slower (used mainly for warnings, where we don't care
1824  * about performance). The internal_trace_puts() is for such
1825  * a purpose.
1826  */
1827 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1828 
1829 #undef FTRACE_ENTRY
1830 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter)     \
1831         extern struct trace_event_call                                  \
1832         __aligned(4) event_##call;
1833 #undef FTRACE_ENTRY_DUP
1834 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1835         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1836                      filter)
1837 #undef FTRACE_ENTRY_PACKED
1838 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \
1839         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1840                      filter)
1841 
1842 #include "trace_entries.h"
1843 
1844 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1845 int perf_ftrace_event_register(struct trace_event_call *call,
1846                                enum trace_reg type, void *data);
1847 #else
1848 #define perf_ftrace_event_register NULL
1849 #endif
1850 
1851 #ifdef CONFIG_FTRACE_SYSCALLS
1852 void init_ftrace_syscalls(void);
1853 const char *get_syscall_name(int syscall);
1854 #else
1855 static inline void init_ftrace_syscalls(void) { }
1856 static inline const char *get_syscall_name(int syscall)
1857 {
1858         return NULL;
1859 }
1860 #endif
1861 
1862 #ifdef CONFIG_EVENT_TRACING
1863 void trace_event_init(void);
1864 void trace_event_eval_update(struct trace_eval_map **map, int len);
1865 #else
1866 static inline void __init trace_event_init(void) { }
1867 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1868 #endif
1869 
1870 #ifdef CONFIG_TRACER_SNAPSHOT
1871 void tracing_snapshot_instance(struct trace_array *tr);
1872 int tracing_alloc_snapshot_instance(struct trace_array *tr);
1873 #else
1874 static inline void tracing_snapshot_instance(struct trace_array *tr) { }
1875 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1876 {
1877         return 0;
1878 }
1879 #endif
1880 
1881 #ifdef CONFIG_PREEMPT_TRACER
1882 void tracer_preempt_on(unsigned long a0, unsigned long a1);
1883 void tracer_preempt_off(unsigned long a0, unsigned long a1);
1884 #else
1885 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
1886 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
1887 #endif
1888 #ifdef CONFIG_IRQSOFF_TRACER
1889 void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
1890 void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
1891 #else
1892 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
1893 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
1894 #endif
1895 
1896 extern struct trace_iterator *tracepoint_print_iter;
1897 
1898 #endif /* _LINUX_KERNEL_TRACE_H */
1899 

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