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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         cpumask_var_t           tracing_cpumask; /* only trace on set CPUs */
263         int                     ref;
264 #ifdef CONFIG_FUNCTION_TRACER
265         struct ftrace_ops       *ops;
266         struct trace_pid_list   __rcu *function_pids;
267 #ifdef CONFIG_DYNAMIC_FTRACE
268         /* All of these are protected by the ftrace_lock */
269         struct list_head        func_probes;
270         struct list_head        mod_trace;
271         struct list_head        mod_notrace;
272 #endif
273         /* function tracing enabled */
274         int                     function_enabled;
275 #endif
276 };
277 
278 enum {
279         TRACE_ARRAY_FL_GLOBAL   = (1 << 0)
280 };
281 
282 extern struct list_head ftrace_trace_arrays;
283 
284 extern struct mutex trace_types_lock;
285 
286 extern int trace_array_get(struct trace_array *tr);
287 extern void trace_array_put(struct trace_array *tr);
288 
289 /*
290  * The global tracer (top) should be the first trace array added,
291  * but we check the flag anyway.
292  */
293 static inline struct trace_array *top_trace_array(void)
294 {
295         struct trace_array *tr;
296 
297         if (list_empty(&ftrace_trace_arrays))
298                 return NULL;
299 
300         tr = list_entry(ftrace_trace_arrays.prev,
301                         typeof(*tr), list);
302         WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
303         return tr;
304 }
305 
306 #define FTRACE_CMP_TYPE(var, type) \
307         __builtin_types_compatible_p(typeof(var), type *)
308 
309 #undef IF_ASSIGN
310 #define IF_ASSIGN(var, entry, etype, id)                \
311         if (FTRACE_CMP_TYPE(var, etype)) {              \
312                 var = (typeof(var))(entry);             \
313                 WARN_ON(id && (entry)->type != id);     \
314                 break;                                  \
315         }
316 
317 /* Will cause compile errors if type is not found. */
318 extern void __ftrace_bad_type(void);
319 
320 /*
321  * The trace_assign_type is a verifier that the entry type is
322  * the same as the type being assigned. To add new types simply
323  * add a line with the following format:
324  *
325  * IF_ASSIGN(var, ent, type, id);
326  *
327  *  Where "type" is the trace type that includes the trace_entry
328  *  as the "ent" item. And "id" is the trace identifier that is
329  *  used in the trace_type enum.
330  *
331  *  If the type can have more than one id, then use zero.
332  */
333 #define trace_assign_type(var, ent)                                     \
334         do {                                                            \
335                 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);     \
336                 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);        \
337                 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);   \
338                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
339                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
340                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
341                 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS);   \
342                 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT);   \
343                 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
344                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
345                           TRACE_MMIO_RW);                               \
346                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
347                           TRACE_MMIO_MAP);                              \
348                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
349                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
350                           TRACE_GRAPH_ENT);             \
351                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
352                           TRACE_GRAPH_RET);             \
353                 __ftrace_bad_type();                                    \
354         } while (0)
355 
356 /*
357  * An option specific to a tracer. This is a boolean value.
358  * The bit is the bit index that sets its value on the
359  * flags value in struct tracer_flags.
360  */
361 struct tracer_opt {
362         const char      *name; /* Will appear on the trace_options file */
363         u32             bit; /* Mask assigned in val field in tracer_flags */
364 };
365 
366 /*
367  * The set of specific options for a tracer. Your tracer
368  * have to set the initial value of the flags val.
369  */
370 struct tracer_flags {
371         u32                     val;
372         struct tracer_opt       *opts;
373         struct tracer           *trace;
374 };
375 
376 /* Makes more easy to define a tracer opt */
377 #define TRACER_OPT(s, b)        .name = #s, .bit = b
378 
379 
380 struct trace_option_dentry {
381         struct tracer_opt               *opt;
382         struct tracer_flags             *flags;
383         struct trace_array              *tr;
384         struct dentry                   *entry;
385 };
386 
387 /**
388  * struct tracer - a specific tracer and its callbacks to interact with tracefs
389  * @name: the name chosen to select it on the available_tracers file
390  * @init: called when one switches to this tracer (echo name > current_tracer)
391  * @reset: called when one switches to another tracer
392  * @start: called when tracing is unpaused (echo 1 > tracing_on)
393  * @stop: called when tracing is paused (echo 0 > tracing_on)
394  * @update_thresh: called when tracing_thresh is updated
395  * @open: called when the trace file is opened
396  * @pipe_open: called when the trace_pipe file is opened
397  * @close: called when the trace file is released
398  * @pipe_close: called when the trace_pipe file is released
399  * @read: override the default read callback on trace_pipe
400  * @splice_read: override the default splice_read callback on trace_pipe
401  * @selftest: selftest to run on boot (see trace_selftest.c)
402  * @print_headers: override the first lines that describe your columns
403  * @print_line: callback that prints a trace
404  * @set_flag: signals one of your private flags changed (trace_options file)
405  * @flags: your private flags
406  */
407 struct tracer {
408         const char              *name;
409         int                     (*init)(struct trace_array *tr);
410         void                    (*reset)(struct trace_array *tr);
411         void                    (*start)(struct trace_array *tr);
412         void                    (*stop)(struct trace_array *tr);
413         int                     (*update_thresh)(struct trace_array *tr);
414         void                    (*open)(struct trace_iterator *iter);
415         void                    (*pipe_open)(struct trace_iterator *iter);
416         void                    (*close)(struct trace_iterator *iter);
417         void                    (*pipe_close)(struct trace_iterator *iter);
418         ssize_t                 (*read)(struct trace_iterator *iter,
419                                         struct file *filp, char __user *ubuf,
420                                         size_t cnt, loff_t *ppos);
421         ssize_t                 (*splice_read)(struct trace_iterator *iter,
422                                                struct file *filp,
423                                                loff_t *ppos,
424                                                struct pipe_inode_info *pipe,
425                                                size_t len,
426                                                unsigned int flags);
427 #ifdef CONFIG_FTRACE_STARTUP_TEST
428         int                     (*selftest)(struct tracer *trace,
429                                             struct trace_array *tr);
430 #endif
431         void                    (*print_header)(struct seq_file *m);
432         enum print_line_t       (*print_line)(struct trace_iterator *iter);
433         /* If you handled the flag setting, return 0 */
434         int                     (*set_flag)(struct trace_array *tr,
435                                             u32 old_flags, u32 bit, int set);
436         /* Return 0 if OK with change, else return non-zero */
437         int                     (*flag_changed)(struct trace_array *tr,
438                                                 u32 mask, int set);
439         struct tracer           *next;
440         struct tracer_flags     *flags;
441         int                     enabled;
442         int                     ref;
443         bool                    print_max;
444         bool                    allow_instances;
445 #ifdef CONFIG_TRACER_MAX_TRACE
446         bool                    use_max_tr;
447 #endif
448         /* True if tracer cannot be enabled in kernel param */
449         bool                    noboot;
450 };
451 
452 
453 /* Only current can touch trace_recursion */
454 
455 /*
456  * For function tracing recursion:
457  *  The order of these bits are important.
458  *
459  *  When function tracing occurs, the following steps are made:
460  *   If arch does not support a ftrace feature:
461  *    call internal function (uses INTERNAL bits) which calls...
462  *   If callback is registered to the "global" list, the list
463  *    function is called and recursion checks the GLOBAL bits.
464  *    then this function calls...
465  *   The function callback, which can use the FTRACE bits to
466  *    check for recursion.
467  *
468  * Now if the arch does not suppport a feature, and it calls
469  * the global list function which calls the ftrace callback
470  * all three of these steps will do a recursion protection.
471  * There's no reason to do one if the previous caller already
472  * did. The recursion that we are protecting against will
473  * go through the same steps again.
474  *
475  * To prevent the multiple recursion checks, if a recursion
476  * bit is set that is higher than the MAX bit of the current
477  * check, then we know that the check was made by the previous
478  * caller, and we can skip the current check.
479  */
480 enum {
481         TRACE_BUFFER_BIT,
482         TRACE_BUFFER_NMI_BIT,
483         TRACE_BUFFER_IRQ_BIT,
484         TRACE_BUFFER_SIRQ_BIT,
485 
486         /* Start of function recursion bits */
487         TRACE_FTRACE_BIT,
488         TRACE_FTRACE_NMI_BIT,
489         TRACE_FTRACE_IRQ_BIT,
490         TRACE_FTRACE_SIRQ_BIT,
491 
492         /* INTERNAL_BITs must be greater than FTRACE_BITs */
493         TRACE_INTERNAL_BIT,
494         TRACE_INTERNAL_NMI_BIT,
495         TRACE_INTERNAL_IRQ_BIT,
496         TRACE_INTERNAL_SIRQ_BIT,
497 
498         TRACE_BRANCH_BIT,
499 /*
500  * Abuse of the trace_recursion.
501  * As we need a way to maintain state if we are tracing the function
502  * graph in irq because we want to trace a particular function that
503  * was called in irq context but we have irq tracing off. Since this
504  * can only be modified by current, we can reuse trace_recursion.
505  */
506         TRACE_IRQ_BIT,
507 };
508 
509 #define trace_recursion_set(bit)        do { (current)->trace_recursion |= (1<<(bit)); } while (0)
510 #define trace_recursion_clear(bit)      do { (current)->trace_recursion &= ~(1<<(bit)); } while (0)
511 #define trace_recursion_test(bit)       ((current)->trace_recursion & (1<<(bit)))
512 
513 #define TRACE_CONTEXT_BITS      4
514 
515 #define TRACE_FTRACE_START      TRACE_FTRACE_BIT
516 #define TRACE_FTRACE_MAX        ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
517 
518 #define TRACE_LIST_START        TRACE_INTERNAL_BIT
519 #define TRACE_LIST_MAX          ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
520 
521 #define TRACE_CONTEXT_MASK      TRACE_LIST_MAX
522 
523 static __always_inline int trace_get_context_bit(void)
524 {
525         int bit;
526 
527         if (in_interrupt()) {
528                 if (in_nmi())
529                         bit = 0;
530 
531                 else if (in_irq())
532                         bit = 1;
533                 else
534                         bit = 2;
535         } else
536                 bit = 3;
537 
538         return bit;
539 }
540 
541 static __always_inline int trace_test_and_set_recursion(int start, int max)
542 {
543         unsigned int val = current->trace_recursion;
544         int bit;
545 
546         /* A previous recursion check was made */
547         if ((val & TRACE_CONTEXT_MASK) > max)
548                 return 0;
549 
550         bit = trace_get_context_bit() + start;
551         if (unlikely(val & (1 << bit)))
552                 return -1;
553 
554         val |= 1 << bit;
555         current->trace_recursion = val;
556         barrier();
557 
558         return bit;
559 }
560 
561 static __always_inline void trace_clear_recursion(int bit)
562 {
563         unsigned int val = current->trace_recursion;
564 
565         if (!bit)
566                 return;
567 
568         bit = 1 << bit;
569         val &= ~bit;
570 
571         barrier();
572         current->trace_recursion = val;
573 }
574 
575 static inline struct ring_buffer_iter *
576 trace_buffer_iter(struct trace_iterator *iter, int cpu)
577 {
578         if (iter->buffer_iter && iter->buffer_iter[cpu])
579                 return iter->buffer_iter[cpu];
580         return NULL;
581 }
582 
583 int tracer_init(struct tracer *t, struct trace_array *tr);
584 int tracing_is_enabled(void);
585 void tracing_reset(struct trace_buffer *buf, int cpu);
586 void tracing_reset_online_cpus(struct trace_buffer *buf);
587 void tracing_reset_current(int cpu);
588 void tracing_reset_all_online_cpus(void);
589 int tracing_open_generic(struct inode *inode, struct file *filp);
590 bool tracing_is_disabled(void);
591 int tracer_tracing_is_on(struct trace_array *tr);
592 void tracer_tracing_on(struct trace_array *tr);
593 void tracer_tracing_off(struct trace_array *tr);
594 struct dentry *trace_create_file(const char *name,
595                                  umode_t mode,
596                                  struct dentry *parent,
597                                  void *data,
598                                  const struct file_operations *fops);
599 
600 struct dentry *tracing_init_dentry(void);
601 
602 struct ring_buffer_event;
603 
604 struct ring_buffer_event *
605 trace_buffer_lock_reserve(struct ring_buffer *buffer,
606                           int type,
607                           unsigned long len,
608                           unsigned long flags,
609                           int pc);
610 
611 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
612                                                 struct trace_array_cpu *data);
613 
614 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
615                                           int *ent_cpu, u64 *ent_ts);
616 
617 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer,
618                                         struct ring_buffer_event *event);
619 
620 int trace_empty(struct trace_iterator *iter);
621 
622 void *trace_find_next_entry_inc(struct trace_iterator *iter);
623 
624 void trace_init_global_iter(struct trace_iterator *iter);
625 
626 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
627 
628 void trace_function(struct trace_array *tr,
629                     unsigned long ip,
630                     unsigned long parent_ip,
631                     unsigned long flags, int pc);
632 void trace_graph_function(struct trace_array *tr,
633                     unsigned long ip,
634                     unsigned long parent_ip,
635                     unsigned long flags, int pc);
636 void trace_latency_header(struct seq_file *m);
637 void trace_default_header(struct seq_file *m);
638 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
639 int trace_empty(struct trace_iterator *iter);
640 
641 void trace_graph_return(struct ftrace_graph_ret *trace);
642 int trace_graph_entry(struct ftrace_graph_ent *trace);
643 void set_graph_array(struct trace_array *tr);
644 
645 void tracing_start_cmdline_record(void);
646 void tracing_stop_cmdline_record(void);
647 void tracing_start_tgid_record(void);
648 void tracing_stop_tgid_record(void);
649 
650 int register_tracer(struct tracer *type);
651 int is_tracing_stopped(void);
652 
653 loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
654 
655 extern cpumask_var_t __read_mostly tracing_buffer_mask;
656 
657 #define for_each_tracing_cpu(cpu)       \
658         for_each_cpu(cpu, tracing_buffer_mask)
659 
660 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
661 
662 extern unsigned long tracing_thresh;
663 
664 /* PID filtering */
665 
666 extern int pid_max;
667 
668 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
669                              pid_t search_pid);
670 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
671                             struct task_struct *task);
672 void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
673                                   struct task_struct *self,
674                                   struct task_struct *task);
675 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
676 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
677 int trace_pid_show(struct seq_file *m, void *v);
678 void trace_free_pid_list(struct trace_pid_list *pid_list);
679 int trace_pid_write(struct trace_pid_list *filtered_pids,
680                     struct trace_pid_list **new_pid_list,
681                     const char __user *ubuf, size_t cnt);
682 
683 #ifdef CONFIG_TRACER_MAX_TRACE
684 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
685 void update_max_tr_single(struct trace_array *tr,
686                           struct task_struct *tsk, int cpu);
687 #endif /* CONFIG_TRACER_MAX_TRACE */
688 
689 #ifdef CONFIG_STACKTRACE
690 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
691                             int pc);
692 
693 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
694                    int pc);
695 #else
696 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
697                                           unsigned long flags, int pc)
698 {
699 }
700 
701 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
702                                  int skip, int pc)
703 {
704 }
705 #endif /* CONFIG_STACKTRACE */
706 
707 extern u64 ftrace_now(int cpu);
708 
709 extern void trace_find_cmdline(int pid, char comm[]);
710 extern int trace_find_tgid(int pid);
711 extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
712 
713 #ifdef CONFIG_DYNAMIC_FTRACE
714 extern unsigned long ftrace_update_tot_cnt;
715 void ftrace_init_trace_array(struct trace_array *tr);
716 #else
717 static inline void ftrace_init_trace_array(struct trace_array *tr) { }
718 #endif
719 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
720 extern int DYN_FTRACE_TEST_NAME(void);
721 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
722 extern int DYN_FTRACE_TEST_NAME2(void);
723 
724 extern bool ring_buffer_expanded;
725 extern bool tracing_selftest_disabled;
726 
727 #ifdef CONFIG_FTRACE_STARTUP_TEST
728 extern int trace_selftest_startup_function(struct tracer *trace,
729                                            struct trace_array *tr);
730 extern int trace_selftest_startup_function_graph(struct tracer *trace,
731                                                  struct trace_array *tr);
732 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
733                                           struct trace_array *tr);
734 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
735                                              struct trace_array *tr);
736 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
737                                                  struct trace_array *tr);
738 extern int trace_selftest_startup_wakeup(struct tracer *trace,
739                                          struct trace_array *tr);
740 extern int trace_selftest_startup_nop(struct tracer *trace,
741                                          struct trace_array *tr);
742 extern int trace_selftest_startup_branch(struct tracer *trace,
743                                          struct trace_array *tr);
744 /*
745  * Tracer data references selftest functions that only occur
746  * on boot up. These can be __init functions. Thus, when selftests
747  * are enabled, then the tracers need to reference __init functions.
748  */
749 #define __tracer_data           __refdata
750 #else
751 /* Tracers are seldom changed. Optimize when selftests are disabled. */
752 #define __tracer_data           __read_mostly
753 #endif /* CONFIG_FTRACE_STARTUP_TEST */
754 
755 extern void *head_page(struct trace_array_cpu *data);
756 extern unsigned long long ns2usecs(u64 nsec);
757 extern int
758 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
759 extern int
760 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
761 extern int
762 trace_array_vprintk(struct trace_array *tr,
763                     unsigned long ip, const char *fmt, va_list args);
764 int trace_array_printk(struct trace_array *tr,
765                        unsigned long ip, const char *fmt, ...);
766 int trace_array_printk_buf(struct ring_buffer *buffer,
767                            unsigned long ip, const char *fmt, ...);
768 void trace_printk_seq(struct trace_seq *s);
769 enum print_line_t print_trace_line(struct trace_iterator *iter);
770 
771 extern char trace_find_mark(unsigned long long duration);
772 
773 struct ftrace_hash;
774 
775 struct ftrace_mod_load {
776         struct list_head        list;
777         char                    *func;
778         char                    *module;
779         int                      enable;
780 };
781 
782 enum {
783         FTRACE_HASH_FL_MOD      = (1 << 0),
784 };
785 
786 struct ftrace_hash {
787         unsigned long           size_bits;
788         struct hlist_head       *buckets;
789         unsigned long           count;
790         unsigned long           flags;
791         struct rcu_head         rcu;
792 };
793 
794 struct ftrace_func_entry *
795 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
796 
797 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
798 {
799         return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
800 }
801 
802 /* Standard output formatting function used for function return traces */
803 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
804 
805 /* Flag options */
806 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
807 #define TRACE_GRAPH_PRINT_CPU           0x2
808 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
809 #define TRACE_GRAPH_PRINT_PROC          0x8
810 #define TRACE_GRAPH_PRINT_DURATION      0x10
811 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
812 #define TRACE_GRAPH_PRINT_IRQS          0x40
813 #define TRACE_GRAPH_PRINT_TAIL          0x80
814 #define TRACE_GRAPH_SLEEP_TIME          0x100
815 #define TRACE_GRAPH_GRAPH_TIME          0x200
816 #define TRACE_GRAPH_PRINT_FILL_SHIFT    28
817 #define TRACE_GRAPH_PRINT_FILL_MASK     (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
818 
819 extern void ftrace_graph_sleep_time_control(bool enable);
820 extern void ftrace_graph_graph_time_control(bool enable);
821 
822 extern enum print_line_t
823 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
824 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
825 extern void
826 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
827 extern void graph_trace_open(struct trace_iterator *iter);
828 extern void graph_trace_close(struct trace_iterator *iter);
829 extern int __trace_graph_entry(struct trace_array *tr,
830                                struct ftrace_graph_ent *trace,
831                                unsigned long flags, int pc);
832 extern void __trace_graph_return(struct trace_array *tr,
833                                  struct ftrace_graph_ret *trace,
834                                  unsigned long flags, int pc);
835 
836 #ifdef CONFIG_DYNAMIC_FTRACE
837 extern struct ftrace_hash *ftrace_graph_hash;
838 extern struct ftrace_hash *ftrace_graph_notrace_hash;
839 
840 static inline int ftrace_graph_addr(unsigned long addr)
841 {
842         int ret = 0;
843 
844         preempt_disable_notrace();
845 
846         if (ftrace_hash_empty(ftrace_graph_hash)) {
847                 ret = 1;
848                 goto out;
849         }
850 
851         if (ftrace_lookup_ip(ftrace_graph_hash, addr)) {
852                 /*
853                  * If no irqs are to be traced, but a set_graph_function
854                  * is set, and called by an interrupt handler, we still
855                  * want to trace it.
856                  */
857                 if (in_irq())
858                         trace_recursion_set(TRACE_IRQ_BIT);
859                 else
860                         trace_recursion_clear(TRACE_IRQ_BIT);
861                 ret = 1;
862         }
863 
864 out:
865         preempt_enable_notrace();
866         return ret;
867 }
868 
869 static inline int ftrace_graph_notrace_addr(unsigned long addr)
870 {
871         int ret = 0;
872 
873         preempt_disable_notrace();
874 
875         if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr))
876                 ret = 1;
877 
878         preempt_enable_notrace();
879         return ret;
880 }
881 #else
882 static inline int ftrace_graph_addr(unsigned long addr)
883 {
884         return 1;
885 }
886 
887 static inline int ftrace_graph_notrace_addr(unsigned long addr)
888 {
889         return 0;
890 }
891 #endif /* CONFIG_DYNAMIC_FTRACE */
892 
893 extern unsigned int fgraph_max_depth;
894 
895 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
896 {
897         /* trace it when it is-nested-in or is a function enabled. */
898         return !(trace->depth || ftrace_graph_addr(trace->func)) ||
899                 (trace->depth < 0) ||
900                 (fgraph_max_depth && trace->depth >= fgraph_max_depth);
901 }
902 
903 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
904 static inline enum print_line_t
905 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
906 {
907         return TRACE_TYPE_UNHANDLED;
908 }
909 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
910 
911 extern struct list_head ftrace_pids;
912 
913 #ifdef CONFIG_FUNCTION_TRACER
914 struct ftrace_func_command {
915         struct list_head        list;
916         char                    *name;
917         int                     (*func)(struct trace_array *tr,
918                                         struct ftrace_hash *hash,
919                                         char *func, char *cmd,
920                                         char *params, int enable);
921 };
922 extern bool ftrace_filter_param __initdata;
923 static inline int ftrace_trace_task(struct trace_array *tr)
924 {
925         return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid);
926 }
927 extern int ftrace_is_dead(void);
928 int ftrace_create_function_files(struct trace_array *tr,
929                                  struct dentry *parent);
930 void ftrace_destroy_function_files(struct trace_array *tr);
931 void ftrace_init_global_array_ops(struct trace_array *tr);
932 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
933 void ftrace_reset_array_ops(struct trace_array *tr);
934 int using_ftrace_ops_list_func(void);
935 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
936 void ftrace_init_tracefs_toplevel(struct trace_array *tr,
937                                   struct dentry *d_tracer);
938 void ftrace_clear_pids(struct trace_array *tr);
939 int init_function_trace(void);
940 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
941 #else
942 static inline int ftrace_trace_task(struct trace_array *tr)
943 {
944         return 1;
945 }
946 static inline int ftrace_is_dead(void) { return 0; }
947 static inline int
948 ftrace_create_function_files(struct trace_array *tr,
949                              struct dentry *parent)
950 {
951         return 0;
952 }
953 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
954 static inline __init void
955 ftrace_init_global_array_ops(struct trace_array *tr) { }
956 static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
957 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
958 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
959 static inline void ftrace_clear_pids(struct trace_array *tr) { }
960 static inline int init_function_trace(void) { return 0; }
961 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
962 /* ftace_func_t type is not defined, use macro instead of static inline */
963 #define ftrace_init_array_ops(tr, func) do { } while (0)
964 #endif /* CONFIG_FUNCTION_TRACER */
965 
966 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
967 
968 struct ftrace_probe_ops {
969         void                    (*func)(unsigned long ip,
970                                         unsigned long parent_ip,
971                                         struct trace_array *tr,
972                                         struct ftrace_probe_ops *ops,
973                                         void *data);
974         int                     (*init)(struct ftrace_probe_ops *ops,
975                                         struct trace_array *tr,
976                                         unsigned long ip, void *init_data,
977                                         void **data);
978         void                    (*free)(struct ftrace_probe_ops *ops,
979                                         struct trace_array *tr,
980                                         unsigned long ip, void *data);
981         int                     (*print)(struct seq_file *m,
982                                          unsigned long ip,
983                                          struct ftrace_probe_ops *ops,
984                                          void *data);
985 };
986 
987 struct ftrace_func_mapper;
988 typedef int (*ftrace_mapper_func)(void *data);
989 
990 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
991 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
992                                            unsigned long ip);
993 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
994                                unsigned long ip, void *data);
995 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
996                                    unsigned long ip);
997 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
998                              ftrace_mapper_func free_func);
999 
1000 extern int
1001 register_ftrace_function_probe(char *glob, struct trace_array *tr,
1002                                struct ftrace_probe_ops *ops, void *data);
1003 extern int
1004 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1005                                       struct ftrace_probe_ops *ops);
1006 extern void clear_ftrace_function_probes(struct trace_array *tr);
1007 
1008 int register_ftrace_command(struct ftrace_func_command *cmd);
1009 int unregister_ftrace_command(struct ftrace_func_command *cmd);
1010 
1011 void ftrace_create_filter_files(struct ftrace_ops *ops,
1012                                 struct dentry *parent);
1013 void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1014 #else
1015 struct ftrace_func_command;
1016 
1017 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1018 {
1019         return -EINVAL;
1020 }
1021 static inline __init int unregister_ftrace_command(char *cmd_name)
1022 {
1023         return -EINVAL;
1024 }
1025 static inline void clear_ftrace_function_probes(struct trace_array *tr)
1026 {
1027 }
1028 
1029 /*
1030  * The ops parameter passed in is usually undefined.
1031  * This must be a macro.
1032  */
1033 #define ftrace_create_filter_files(ops, parent) do { } while (0)
1034 #define ftrace_destroy_filter_files(ops) do { } while (0)
1035 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1036 
1037 bool ftrace_event_is_function(struct trace_event_call *call);
1038 
1039 /*
1040  * struct trace_parser - servers for reading the user input separated by spaces
1041  * @cont: set if the input is not complete - no final space char was found
1042  * @buffer: holds the parsed user input
1043  * @idx: user input length
1044  * @size: buffer size
1045  */
1046 struct trace_parser {
1047         bool            cont;
1048         char            *buffer;
1049         unsigned        idx;
1050         unsigned        size;
1051 };
1052 
1053 static inline bool trace_parser_loaded(struct trace_parser *parser)
1054 {
1055         return (parser->idx != 0);
1056 }
1057 
1058 static inline bool trace_parser_cont(struct trace_parser *parser)
1059 {
1060         return parser->cont;
1061 }
1062 
1063 static inline void trace_parser_clear(struct trace_parser *parser)
1064 {
1065         parser->cont = false;
1066         parser->idx = 0;
1067 }
1068 
1069 extern int trace_parser_get_init(struct trace_parser *parser, int size);
1070 extern void trace_parser_put(struct trace_parser *parser);
1071 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1072         size_t cnt, loff_t *ppos);
1073 
1074 /*
1075  * Only create function graph options if function graph is configured.
1076  */
1077 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1078 # define FGRAPH_FLAGS                                           \
1079                 C(DISPLAY_GRAPH,        "display-graph"),
1080 #else
1081 # define FGRAPH_FLAGS
1082 #endif
1083 
1084 #ifdef CONFIG_BRANCH_TRACER
1085 # define BRANCH_FLAGS                                   \
1086                 C(BRANCH,               "branch"),
1087 #else
1088 # define BRANCH_FLAGS
1089 #endif
1090 
1091 #ifdef CONFIG_FUNCTION_TRACER
1092 # define FUNCTION_FLAGS                                         \
1093                 C(FUNCTION,             "function-trace"),      \
1094                 C(FUNC_FORK,            "function-fork"),
1095 # define FUNCTION_DEFAULT_FLAGS         TRACE_ITER_FUNCTION
1096 #else
1097 # define FUNCTION_FLAGS
1098 # define FUNCTION_DEFAULT_FLAGS         0UL
1099 # define TRACE_ITER_FUNC_FORK           0UL
1100 #endif
1101 
1102 #ifdef CONFIG_STACKTRACE
1103 # define STACK_FLAGS                            \
1104                 C(STACKTRACE,           "stacktrace"),
1105 #else
1106 # define STACK_FLAGS
1107 #endif
1108 
1109 /*
1110  * trace_iterator_flags is an enumeration that defines bit
1111  * positions into trace_flags that controls the output.
1112  *
1113  * NOTE: These bits must match the trace_options array in
1114  *       trace.c (this macro guarantees it).
1115  */
1116 #define TRACE_FLAGS                                             \
1117                 C(PRINT_PARENT,         "print-parent"),        \
1118                 C(SYM_OFFSET,           "sym-offset"),          \
1119                 C(SYM_ADDR,             "sym-addr"),            \
1120                 C(VERBOSE,              "verbose"),             \
1121                 C(RAW,                  "raw"),                 \
1122                 C(HEX,                  "hex"),                 \
1123                 C(BIN,                  "bin"),                 \
1124                 C(BLOCK,                "block"),               \
1125                 C(PRINTK,               "trace_printk"),        \
1126                 C(ANNOTATE,             "annotate"),            \
1127                 C(USERSTACKTRACE,       "userstacktrace"),      \
1128                 C(SYM_USEROBJ,          "sym-userobj"),         \
1129                 C(PRINTK_MSGONLY,       "printk-msg-only"),     \
1130                 C(CONTEXT_INFO,         "context-info"),   /* Print pid/cpu/time */ \
1131                 C(LATENCY_FMT,          "latency-format"),      \
1132                 C(RECORD_CMD,           "record-cmd"),          \
1133                 C(RECORD_TGID,          "record-tgid"),         \
1134                 C(OVERWRITE,            "overwrite"),           \
1135                 C(STOP_ON_FREE,         "disable_on_free"),     \
1136                 C(IRQ_INFO,             "irq-info"),            \
1137                 C(MARKERS,              "markers"),             \
1138                 C(EVENT_FORK,           "event-fork"),          \
1139                 FUNCTION_FLAGS                                  \
1140                 FGRAPH_FLAGS                                    \
1141                 STACK_FLAGS                                     \
1142                 BRANCH_FLAGS
1143 
1144 /*
1145  * By defining C, we can make TRACE_FLAGS a list of bit names
1146  * that will define the bits for the flag masks.
1147  */
1148 #undef C
1149 #define C(a, b) TRACE_ITER_##a##_BIT
1150 
1151 enum trace_iterator_bits {
1152         TRACE_FLAGS
1153         /* Make sure we don't go more than we have bits for */
1154         TRACE_ITER_LAST_BIT
1155 };
1156 
1157 /*
1158  * By redefining C, we can make TRACE_FLAGS a list of masks that
1159  * use the bits as defined above.
1160  */
1161 #undef C
1162 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1163 
1164 enum trace_iterator_flags { TRACE_FLAGS };
1165 
1166 /*
1167  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1168  * control the output of kernel symbols.
1169  */
1170 #define TRACE_ITER_SYM_MASK \
1171         (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1172 
1173 extern struct tracer nop_trace;
1174 
1175 #ifdef CONFIG_BRANCH_TRACER
1176 extern int enable_branch_tracing(struct trace_array *tr);
1177 extern void disable_branch_tracing(void);
1178 static inline int trace_branch_enable(struct trace_array *tr)
1179 {
1180         if (tr->trace_flags & TRACE_ITER_BRANCH)
1181                 return enable_branch_tracing(tr);
1182         return 0;
1183 }
1184 static inline void trace_branch_disable(void)
1185 {
1186         /* due to races, always disable */
1187         disable_branch_tracing();
1188 }
1189 #else
1190 static inline int trace_branch_enable(struct trace_array *tr)
1191 {
1192         return 0;
1193 }
1194 static inline void trace_branch_disable(void)
1195 {
1196 }
1197 #endif /* CONFIG_BRANCH_TRACER */
1198 
1199 /* set ring buffers to default size if not already done so */
1200 int tracing_update_buffers(void);
1201 
1202 struct ftrace_event_field {
1203         struct list_head        link;
1204         const char              *name;
1205         const char              *type;
1206         int                     filter_type;
1207         int                     offset;
1208         int                     size;
1209         int                     is_signed;
1210 };
1211 
1212 struct event_filter {
1213         int                     n_preds;        /* Number assigned */
1214         int                     a_preds;        /* allocated */
1215         struct filter_pred __rcu        *preds;
1216         struct filter_pred __rcu        *root;
1217         char                            *filter_string;
1218 };
1219 
1220 struct event_subsystem {
1221         struct list_head        list;
1222         const char              *name;
1223         struct event_filter     *filter;
1224         int                     ref_count;
1225 };
1226 
1227 struct trace_subsystem_dir {
1228         struct list_head                list;
1229         struct event_subsystem          *subsystem;
1230         struct trace_array              *tr;
1231         struct dentry                   *entry;
1232         int                             ref_count;
1233         int                             nr_events;
1234 };
1235 
1236 extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1237                                      struct ring_buffer *buffer,
1238                                      struct ring_buffer_event *event);
1239 
1240 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1241                                      struct ring_buffer *buffer,
1242                                      struct ring_buffer_event *event,
1243                                      unsigned long flags, int pc,
1244                                      struct pt_regs *regs);
1245 
1246 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1247                                               struct ring_buffer *buffer,
1248                                               struct ring_buffer_event *event,
1249                                               unsigned long flags, int pc)
1250 {
1251         trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
1252 }
1253 
1254 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1255 DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1256 void trace_buffered_event_disable(void);
1257 void trace_buffered_event_enable(void);
1258 
1259 static inline void
1260 __trace_event_discard_commit(struct ring_buffer *buffer,
1261                              struct ring_buffer_event *event)
1262 {
1263         if (this_cpu_read(trace_buffered_event) == event) {
1264                 /* Simply release the temp buffer */
1265                 this_cpu_dec(trace_buffered_event_cnt);
1266                 return;
1267         }
1268         ring_buffer_discard_commit(buffer, event);
1269 }
1270 
1271 /*
1272  * Helper function for event_trigger_unlock_commit{_regs}().
1273  * If there are event triggers attached to this event that requires
1274  * filtering against its fields, then they wil be called as the
1275  * entry already holds the field information of the current event.
1276  *
1277  * It also checks if the event should be discarded or not.
1278  * It is to be discarded if the event is soft disabled and the
1279  * event was only recorded to process triggers, or if the event
1280  * filter is active and this event did not match the filters.
1281  *
1282  * Returns true if the event is discarded, false otherwise.
1283  */
1284 static inline bool
1285 __event_trigger_test_discard(struct trace_event_file *file,
1286                              struct ring_buffer *buffer,
1287                              struct ring_buffer_event *event,
1288                              void *entry,
1289                              enum event_trigger_type *tt)
1290 {
1291         unsigned long eflags = file->flags;
1292 
1293         if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1294                 *tt = event_triggers_call(file, entry);
1295 
1296         if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1297             (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1298              !filter_match_preds(file->filter, entry))) {
1299                 __trace_event_discard_commit(buffer, event);
1300                 return true;
1301         }
1302 
1303         return false;
1304 }
1305 
1306 /**
1307  * event_trigger_unlock_commit - handle triggers and finish event commit
1308  * @file: The file pointer assoctiated to the event
1309  * @buffer: The ring buffer that the event is being written to
1310  * @event: The event meta data in the ring buffer
1311  * @entry: The event itself
1312  * @irq_flags: The state of the interrupts at the start of the event
1313  * @pc: The state of the preempt count at the start of the event.
1314  *
1315  * This is a helper function to handle triggers that require data
1316  * from the event itself. It also tests the event against filters and
1317  * if the event is soft disabled and should be discarded.
1318  */
1319 static inline void
1320 event_trigger_unlock_commit(struct trace_event_file *file,
1321                             struct ring_buffer *buffer,
1322                             struct ring_buffer_event *event,
1323                             void *entry, unsigned long irq_flags, int pc)
1324 {
1325         enum event_trigger_type tt = ETT_NONE;
1326 
1327         if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1328                 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
1329 
1330         if (tt)
1331                 event_triggers_post_call(file, tt, entry);
1332 }
1333 
1334 /**
1335  * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1336  * @file: The file pointer assoctiated to the event
1337  * @buffer: The ring buffer that the event is being written to
1338  * @event: The event meta data in the ring buffer
1339  * @entry: The event itself
1340  * @irq_flags: The state of the interrupts at the start of the event
1341  * @pc: The state of the preempt count at the start of the event.
1342  *
1343  * This is a helper function to handle triggers that require data
1344  * from the event itself. It also tests the event against filters and
1345  * if the event is soft disabled and should be discarded.
1346  *
1347  * Same as event_trigger_unlock_commit() but calls
1348  * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1349  */
1350 static inline void
1351 event_trigger_unlock_commit_regs(struct trace_event_file *file,
1352                                  struct ring_buffer *buffer,
1353                                  struct ring_buffer_event *event,
1354                                  void *entry, unsigned long irq_flags, int pc,
1355                                  struct pt_regs *regs)
1356 {
1357         enum event_trigger_type tt = ETT_NONE;
1358 
1359         if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1360                 trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1361                                                 irq_flags, pc, regs);
1362 
1363         if (tt)
1364                 event_triggers_post_call(file, tt, entry);
1365 }
1366 
1367 #define FILTER_PRED_INVALID     ((unsigned short)-1)
1368 #define FILTER_PRED_IS_RIGHT    (1 << 15)
1369 #define FILTER_PRED_FOLD        (1 << 15)
1370 
1371 /*
1372  * The max preds is the size of unsigned short with
1373  * two flags at the MSBs. One bit is used for both the IS_RIGHT
1374  * and FOLD flags. The other is reserved.
1375  *
1376  * 2^14 preds is way more than enough.
1377  */
1378 #define MAX_FILTER_PRED         16384
1379 
1380 struct filter_pred;
1381 struct regex;
1382 
1383 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1384 
1385 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1386 
1387 enum regex_type {
1388         MATCH_FULL = 0,
1389         MATCH_FRONT_ONLY,
1390         MATCH_MIDDLE_ONLY,
1391         MATCH_END_ONLY,
1392         MATCH_GLOB,
1393 };
1394 
1395 struct regex {
1396         char                    pattern[MAX_FILTER_STR_VAL];
1397         int                     len;
1398         int                     field_len;
1399         regex_match_func        match;
1400 };
1401 
1402 struct filter_pred {
1403         filter_pred_fn_t        fn;
1404         u64                     val;
1405         struct regex            regex;
1406         unsigned short          *ops;
1407         struct ftrace_event_field *field;
1408         int                     offset;
1409         int                     not;
1410         int                     op;
1411         unsigned short          index;
1412         unsigned short          parent;
1413         unsigned short          left;
1414         unsigned short          right;
1415 };
1416 
1417 static inline bool is_string_field(struct ftrace_event_field *field)
1418 {
1419         return field->filter_type == FILTER_DYN_STRING ||
1420                field->filter_type == FILTER_STATIC_STRING ||
1421                field->filter_type == FILTER_PTR_STRING ||
1422                field->filter_type == FILTER_COMM;
1423 }
1424 
1425 static inline bool is_function_field(struct ftrace_event_field *field)
1426 {
1427         return field->filter_type == FILTER_TRACE_FN;
1428 }
1429 
1430 extern enum regex_type
1431 filter_parse_regex(char *buff, int len, char **search, int *not);
1432 extern void print_event_filter(struct trace_event_file *file,
1433                                struct trace_seq *s);
1434 extern int apply_event_filter(struct trace_event_file *file,
1435                               char *filter_string);
1436 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1437                                         char *filter_string);
1438 extern void print_subsystem_event_filter(struct event_subsystem *system,
1439                                          struct trace_seq *s);
1440 extern int filter_assign_type(const char *type);
1441 extern int create_event_filter(struct trace_event_call *call,
1442                                char *filter_str, bool set_str,
1443                                struct event_filter **filterp);
1444 extern void free_event_filter(struct event_filter *filter);
1445 
1446 struct ftrace_event_field *
1447 trace_find_event_field(struct trace_event_call *call, char *name);
1448 
1449 extern void trace_event_enable_cmd_record(bool enable);
1450 extern void trace_event_enable_tgid_record(bool enable);
1451 
1452 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1453 extern int event_trace_del_tracer(struct trace_array *tr);
1454 
1455 extern struct trace_event_file *find_event_file(struct trace_array *tr,
1456                                                 const char *system,
1457                                                 const char *event);
1458 
1459 static inline void *event_file_data(struct file *filp)
1460 {
1461         return READ_ONCE(file_inode(filp)->i_private);
1462 }
1463 
1464 extern struct mutex event_mutex;
1465 extern struct list_head ftrace_events;
1466 
1467 extern const struct file_operations event_trigger_fops;
1468 extern const struct file_operations event_hist_fops;
1469 
1470 #ifdef CONFIG_HIST_TRIGGERS
1471 extern int register_trigger_hist_cmd(void);
1472 extern int register_trigger_hist_enable_disable_cmds(void);
1473 #else
1474 static inline int register_trigger_hist_cmd(void) { return 0; }
1475 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1476 #endif
1477 
1478 extern int register_trigger_cmds(void);
1479 extern void clear_event_triggers(struct trace_array *tr);
1480 
1481 struct event_trigger_data {
1482         unsigned long                   count;
1483         int                             ref;
1484         struct event_trigger_ops        *ops;
1485         struct event_command            *cmd_ops;
1486         struct event_filter __rcu       *filter;
1487         char                            *filter_str;
1488         void                            *private_data;
1489         bool                            paused;
1490         bool                            paused_tmp;
1491         struct list_head                list;
1492         char                            *name;
1493         struct list_head                named_list;
1494         struct event_trigger_data       *named_data;
1495 };
1496 
1497 /* Avoid typos */
1498 #define ENABLE_EVENT_STR        "enable_event"
1499 #define DISABLE_EVENT_STR       "disable_event"
1500 #define ENABLE_HIST_STR         "enable_hist"
1501 #define DISABLE_HIST_STR        "disable_hist"
1502 
1503 struct enable_trigger_data {
1504         struct trace_event_file         *file;
1505         bool                            enable;
1506         bool                            hist;
1507 };
1508 
1509 extern int event_enable_trigger_print(struct seq_file *m,
1510                                       struct event_trigger_ops *ops,
1511                                       struct event_trigger_data *data);
1512 extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1513                                       struct event_trigger_data *data);
1514 extern int event_enable_trigger_func(struct event_command *cmd_ops,
1515                                      struct trace_event_file *file,
1516                                      char *glob, char *cmd, char *param);
1517 extern int event_enable_register_trigger(char *glob,
1518                                          struct event_trigger_ops *ops,
1519                                          struct event_trigger_data *data,
1520                                          struct trace_event_file *file);
1521 extern void event_enable_unregister_trigger(char *glob,
1522                                             struct event_trigger_ops *ops,
1523                                             struct event_trigger_data *test,
1524                                             struct trace_event_file *file);
1525 extern void trigger_data_free(struct event_trigger_data *data);
1526 extern int event_trigger_init(struct event_trigger_ops *ops,
1527                               struct event_trigger_data *data);
1528 extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1529                                               int trigger_enable);
1530 extern void update_cond_flag(struct trace_event_file *file);
1531 extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
1532                                struct event_trigger_data *test,
1533                                struct trace_event_file *file);
1534 extern int set_trigger_filter(char *filter_str,
1535                               struct event_trigger_data *trigger_data,
1536                               struct trace_event_file *file);
1537 extern struct event_trigger_data *find_named_trigger(const char *name);
1538 extern bool is_named_trigger(struct event_trigger_data *test);
1539 extern int save_named_trigger(const char *name,
1540                               struct event_trigger_data *data);
1541 extern void del_named_trigger(struct event_trigger_data *data);
1542 extern void pause_named_trigger(struct event_trigger_data *data);
1543 extern void unpause_named_trigger(struct event_trigger_data *data);
1544 extern void set_named_trigger_data(struct event_trigger_data *data,
1545                                    struct event_trigger_data *named_data);
1546 extern int register_event_command(struct event_command *cmd);
1547 extern int unregister_event_command(struct event_command *cmd);
1548 extern int register_trigger_hist_enable_disable_cmds(void);
1549 
1550 /**
1551  * struct event_trigger_ops - callbacks for trace event triggers
1552  *
1553  * The methods in this structure provide per-event trigger hooks for
1554  * various trigger operations.
1555  *
1556  * All the methods below, except for @init() and @free(), must be
1557  * implemented.
1558  *
1559  * @func: The trigger 'probe' function called when the triggering
1560  *      event occurs.  The data passed into this callback is the data
1561  *      that was supplied to the event_command @reg() function that
1562  *      registered the trigger (see struct event_command) along with
1563  *      the trace record, rec.
1564  *
1565  * @init: An optional initialization function called for the trigger
1566  *      when the trigger is registered (via the event_command reg()
1567  *      function).  This can be used to perform per-trigger
1568  *      initialization such as incrementing a per-trigger reference
1569  *      count, for instance.  This is usually implemented by the
1570  *      generic utility function @event_trigger_init() (see
1571  *      trace_event_triggers.c).
1572  *
1573  * @free: An optional de-initialization function called for the
1574  *      trigger when the trigger is unregistered (via the
1575  *      event_command @reg() function).  This can be used to perform
1576  *      per-trigger de-initialization such as decrementing a
1577  *      per-trigger reference count and freeing corresponding trigger
1578  *      data, for instance.  This is usually implemented by the
1579  *      generic utility function @event_trigger_free() (see
1580  *      trace_event_triggers.c).
1581  *
1582  * @print: The callback function invoked to have the trigger print
1583  *      itself.  This is usually implemented by a wrapper function
1584  *      that calls the generic utility function @event_trigger_print()
1585  *      (see trace_event_triggers.c).
1586  */
1587 struct event_trigger_ops {
1588         void                    (*func)(struct event_trigger_data *data,
1589                                         void *rec);
1590         int                     (*init)(struct event_trigger_ops *ops,
1591                                         struct event_trigger_data *data);
1592         void                    (*free)(struct event_trigger_ops *ops,
1593                                         struct event_trigger_data *data);
1594         int                     (*print)(struct seq_file *m,
1595                                          struct event_trigger_ops *ops,
1596                                          struct event_trigger_data *data);
1597 };
1598 
1599 /**
1600  * struct event_command - callbacks and data members for event commands
1601  *
1602  * Event commands are invoked by users by writing the command name
1603  * into the 'trigger' file associated with a trace event.  The
1604  * parameters associated with a specific invocation of an event
1605  * command are used to create an event trigger instance, which is
1606  * added to the list of trigger instances associated with that trace
1607  * event.  When the event is hit, the set of triggers associated with
1608  * that event is invoked.
1609  *
1610  * The data members in this structure provide per-event command data
1611  * for various event commands.
1612  *
1613  * All the data members below, except for @post_trigger, must be set
1614  * for each event command.
1615  *
1616  * @name: The unique name that identifies the event command.  This is
1617  *      the name used when setting triggers via trigger files.
1618  *
1619  * @trigger_type: A unique id that identifies the event command
1620  *      'type'.  This value has two purposes, the first to ensure that
1621  *      only one trigger of the same type can be set at a given time
1622  *      for a particular event e.g. it doesn't make sense to have both
1623  *      a traceon and traceoff trigger attached to a single event at
1624  *      the same time, so traceon and traceoff have the same type
1625  *      though they have different names.  The @trigger_type value is
1626  *      also used as a bit value for deferring the actual trigger
1627  *      action until after the current event is finished.  Some
1628  *      commands need to do this if they themselves log to the trace
1629  *      buffer (see the @post_trigger() member below).  @trigger_type
1630  *      values are defined by adding new values to the trigger_type
1631  *      enum in include/linux/trace_events.h.
1632  *
1633  * @flags: See the enum event_command_flags below.
1634  *
1635  * All the methods below, except for @set_filter() and @unreg_all(),
1636  * must be implemented.
1637  *
1638  * @func: The callback function responsible for parsing and
1639  *      registering the trigger written to the 'trigger' file by the
1640  *      user.  It allocates the trigger instance and registers it with
1641  *      the appropriate trace event.  It makes use of the other
1642  *      event_command callback functions to orchestrate this, and is
1643  *      usually implemented by the generic utility function
1644  *      @event_trigger_callback() (see trace_event_triggers.c).
1645  *
1646  * @reg: Adds the trigger to the list of triggers associated with the
1647  *      event, and enables the event trigger itself, after
1648  *      initializing it (via the event_trigger_ops @init() function).
1649  *      This is also where commands can use the @trigger_type value to
1650  *      make the decision as to whether or not multiple instances of
1651  *      the trigger should be allowed.  This is usually implemented by
1652  *      the generic utility function @register_trigger() (see
1653  *      trace_event_triggers.c).
1654  *
1655  * @unreg: Removes the trigger from the list of triggers associated
1656  *      with the event, and disables the event trigger itself, after
1657  *      initializing it (via the event_trigger_ops @free() function).
1658  *      This is usually implemented by the generic utility function
1659  *      @unregister_trigger() (see trace_event_triggers.c).
1660  *
1661  * @unreg_all: An optional function called to remove all the triggers
1662  *      from the list of triggers associated with the event.  Called
1663  *      when a trigger file is opened in truncate mode.
1664  *
1665  * @set_filter: An optional function called to parse and set a filter
1666  *      for the trigger.  If no @set_filter() method is set for the
1667  *      event command, filters set by the user for the command will be
1668  *      ignored.  This is usually implemented by the generic utility
1669  *      function @set_trigger_filter() (see trace_event_triggers.c).
1670  *
1671  * @get_trigger_ops: The callback function invoked to retrieve the
1672  *      event_trigger_ops implementation associated with the command.
1673  */
1674 struct event_command {
1675         struct list_head        list;
1676         char                    *name;
1677         enum event_trigger_type trigger_type;
1678         int                     flags;
1679         int                     (*func)(struct event_command *cmd_ops,
1680                                         struct trace_event_file *file,
1681                                         char *glob, char *cmd, char *params);
1682         int                     (*reg)(char *glob,
1683                                        struct event_trigger_ops *ops,
1684                                        struct event_trigger_data *data,
1685                                        struct trace_event_file *file);
1686         void                    (*unreg)(char *glob,
1687                                          struct event_trigger_ops *ops,
1688                                          struct event_trigger_data *data,
1689                                          struct trace_event_file *file);
1690         void                    (*unreg_all)(struct trace_event_file *file);
1691         int                     (*set_filter)(char *filter_str,
1692                                               struct event_trigger_data *data,
1693                                               struct trace_event_file *file);
1694         struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1695 };
1696 
1697 /**
1698  * enum event_command_flags - flags for struct event_command
1699  *
1700  * @POST_TRIGGER: A flag that says whether or not this command needs
1701  *      to have its action delayed until after the current event has
1702  *      been closed.  Some triggers need to avoid being invoked while
1703  *      an event is currently in the process of being logged, since
1704  *      the trigger may itself log data into the trace buffer.  Thus
1705  *      we make sure the current event is committed before invoking
1706  *      those triggers.  To do that, the trigger invocation is split
1707  *      in two - the first part checks the filter using the current
1708  *      trace record; if a command has the @post_trigger flag set, it
1709  *      sets a bit for itself in the return value, otherwise it
1710  *      directly invokes the trigger.  Once all commands have been
1711  *      either invoked or set their return flag, the current record is
1712  *      either committed or discarded.  At that point, if any commands
1713  *      have deferred their triggers, those commands are finally
1714  *      invoked following the close of the current event.  In other
1715  *      words, if the event_trigger_ops @func() probe implementation
1716  *      itself logs to the trace buffer, this flag should be set,
1717  *      otherwise it can be left unspecified.
1718  *
1719  * @NEEDS_REC: A flag that says whether or not this command needs
1720  *      access to the trace record in order to perform its function,
1721  *      regardless of whether or not it has a filter associated with
1722  *      it (filters make a trigger require access to the trace record
1723  *      but are not always present).
1724  */
1725 enum event_command_flags {
1726         EVENT_CMD_FL_POST_TRIGGER       = 1,
1727         EVENT_CMD_FL_NEEDS_REC          = 2,
1728 };
1729 
1730 static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1731 {
1732         return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1733 }
1734 
1735 static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1736 {
1737         return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1738 }
1739 
1740 extern int trace_event_enable_disable(struct trace_event_file *file,
1741                                       int enable, int soft_disable);
1742 extern int tracing_alloc_snapshot(void);
1743 
1744 extern const char *__start___trace_bprintk_fmt[];
1745 extern const char *__stop___trace_bprintk_fmt[];
1746 
1747 extern const char *__start___tracepoint_str[];
1748 extern const char *__stop___tracepoint_str[];
1749 
1750 void trace_printk_control(bool enabled);
1751 void trace_printk_init_buffers(void);
1752 void trace_printk_start_comm(void);
1753 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1754 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1755 
1756 #define MAX_EVENT_NAME_LEN      64
1757 
1758 extern int trace_run_command(const char *buf, int (*createfn)(int, char**));
1759 extern ssize_t trace_parse_run_command(struct file *file,
1760                 const char __user *buffer, size_t count, loff_t *ppos,
1761                 int (*createfn)(int, char**));
1762 
1763 /*
1764  * Normal trace_printk() and friends allocates special buffers
1765  * to do the manipulation, as well as saves the print formats
1766  * into sections to display. But the trace infrastructure wants
1767  * to use these without the added overhead at the price of being
1768  * a bit slower (used mainly for warnings, where we don't care
1769  * about performance). The internal_trace_puts() is for such
1770  * a purpose.
1771  */
1772 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1773 
1774 #undef FTRACE_ENTRY
1775 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter)     \
1776         extern struct trace_event_call                                  \
1777         __aligned(4) event_##call;
1778 #undef FTRACE_ENTRY_DUP
1779 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
1780         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1781                      filter)
1782 #undef FTRACE_ENTRY_PACKED
1783 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \
1784         FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
1785                      filter)
1786 
1787 #include "trace_entries.h"
1788 
1789 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1790 int perf_ftrace_event_register(struct trace_event_call *call,
1791                                enum trace_reg type, void *data);
1792 #else
1793 #define perf_ftrace_event_register NULL
1794 #endif
1795 
1796 #ifdef CONFIG_FTRACE_SYSCALLS
1797 void init_ftrace_syscalls(void);
1798 const char *get_syscall_name(int syscall);
1799 #else
1800 static inline void init_ftrace_syscalls(void) { }
1801 static inline const char *get_syscall_name(int syscall)
1802 {
1803         return NULL;
1804 }
1805 #endif
1806 
1807 #ifdef CONFIG_EVENT_TRACING
1808 void trace_event_init(void);
1809 void trace_event_eval_update(struct trace_eval_map **map, int len);
1810 #else
1811 static inline void __init trace_event_init(void) { }
1812 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1813 #endif
1814 
1815 extern struct trace_iterator *tracepoint_print_iter;
1816 
1817 #endif /* _LINUX_KERNEL_TRACE_H */
1818 

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