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TOMOYO Linux Cross Reference
Linux/include/linux/perf_event.h

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  1 /*
  2  * Performance events:
  3  *
  4  *    Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
  5  *    Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
  6  *    Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
  7  *
  8  * Data type definitions, declarations, prototypes.
  9  *
 10  *    Started by: Thomas Gleixner and Ingo Molnar
 11  *
 12  * For licencing details see kernel-base/COPYING
 13  */
 14 #ifndef _LINUX_PERF_EVENT_H
 15 #define _LINUX_PERF_EVENT_H
 16 
 17 #include <uapi/linux/perf_event.h>
 18 
 19 /*
 20  * Kernel-internal data types and definitions:
 21  */
 22 
 23 #ifdef CONFIG_PERF_EVENTS
 24 # include <asm/perf_event.h>
 25 # include <asm/local64.h>
 26 #endif
 27 
 28 struct perf_guest_info_callbacks {
 29         int                             (*is_in_guest)(void);
 30         int                             (*is_user_mode)(void);
 31         unsigned long                   (*get_guest_ip)(void);
 32 };
 33 
 34 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 35 #include <asm/hw_breakpoint.h>
 36 #endif
 37 
 38 #include <linux/list.h>
 39 #include <linux/mutex.h>
 40 #include <linux/rculist.h>
 41 #include <linux/rcupdate.h>
 42 #include <linux/spinlock.h>
 43 #include <linux/hrtimer.h>
 44 #include <linux/fs.h>
 45 #include <linux/pid_namespace.h>
 46 #include <linux/workqueue.h>
 47 #include <linux/ftrace.h>
 48 #include <linux/cpu.h>
 49 #include <linux/irq_work.h>
 50 #include <linux/static_key.h>
 51 #include <linux/jump_label_ratelimit.h>
 52 #include <linux/atomic.h>
 53 #include <linux/sysfs.h>
 54 #include <linux/perf_regs.h>
 55 #include <linux/workqueue.h>
 56 #include <linux/cgroup.h>
 57 #include <asm/local.h>
 58 
 59 struct perf_callchain_entry {
 60         __u64                           nr;
 61         __u64                           ip[PERF_MAX_STACK_DEPTH];
 62 };
 63 
 64 struct perf_raw_record {
 65         u32                             size;
 66         void                            *data;
 67 };
 68 
 69 /*
 70  * branch stack layout:
 71  *  nr: number of taken branches stored in entries[]
 72  *
 73  * Note that nr can vary from sample to sample
 74  * branches (to, from) are stored from most recent
 75  * to least recent, i.e., entries[0] contains the most
 76  * recent branch.
 77  */
 78 struct perf_branch_stack {
 79         __u64                           nr;
 80         struct perf_branch_entry        entries[0];
 81 };
 82 
 83 struct task_struct;
 84 
 85 /*
 86  * extra PMU register associated with an event
 87  */
 88 struct hw_perf_event_extra {
 89         u64             config; /* register value */
 90         unsigned int    reg;    /* register address or index */
 91         int             alloc;  /* extra register already allocated */
 92         int             idx;    /* index in shared_regs->regs[] */
 93 };
 94 
 95 /**
 96  * struct hw_perf_event - performance event hardware details:
 97  */
 98 struct hw_perf_event {
 99 #ifdef CONFIG_PERF_EVENTS
100         union {
101                 struct { /* hardware */
102                         u64             config;
103                         u64             last_tag;
104                         unsigned long   config_base;
105                         unsigned long   event_base;
106                         int             event_base_rdpmc;
107                         int             idx;
108                         int             last_cpu;
109                         int             flags;
110 
111                         struct hw_perf_event_extra extra_reg;
112                         struct hw_perf_event_extra branch_reg;
113                 };
114                 struct { /* software */
115                         struct hrtimer  hrtimer;
116                 };
117                 struct { /* tracepoint */
118                         /* for tp_event->class */
119                         struct list_head        tp_list;
120                 };
121                 struct { /* intel_cqm */
122                         int                     cqm_state;
123                         u32                     cqm_rmid;
124                         struct list_head        cqm_events_entry;
125                         struct list_head        cqm_groups_entry;
126                         struct list_head        cqm_group_entry;
127                 };
128                 struct { /* itrace */
129                         int                     itrace_started;
130                 };
131 #ifdef CONFIG_HAVE_HW_BREAKPOINT
132                 struct { /* breakpoint */
133                         /*
134                          * Crufty hack to avoid the chicken and egg
135                          * problem hw_breakpoint has with context
136                          * creation and event initalization.
137                          */
138                         struct arch_hw_breakpoint       info;
139                         struct list_head                bp_list;
140                 };
141 #endif
142         };
143         struct task_struct              *target;
144         int                             state;
145         local64_t                       prev_count;
146         u64                             sample_period;
147         u64                             last_period;
148         local64_t                       period_left;
149         u64                             interrupts_seq;
150         u64                             interrupts;
151 
152         u64                             freq_time_stamp;
153         u64                             freq_count_stamp;
154 #endif
155 };
156 
157 /*
158  * hw_perf_event::state flags
159  */
160 #define PERF_HES_STOPPED        0x01 /* the counter is stopped */
161 #define PERF_HES_UPTODATE       0x02 /* event->count up-to-date */
162 #define PERF_HES_ARCH           0x04
163 
164 struct perf_event;
165 
166 /*
167  * Common implementation detail of pmu::{start,commit,cancel}_txn
168  */
169 #define PERF_EVENT_TXN 0x1
170 
171 /**
172  * pmu::capabilities flags
173  */
174 #define PERF_PMU_CAP_NO_INTERRUPT               0x01
175 #define PERF_PMU_CAP_NO_NMI                     0x02
176 #define PERF_PMU_CAP_AUX_NO_SG                  0x04
177 #define PERF_PMU_CAP_AUX_SW_DOUBLEBUF           0x08
178 #define PERF_PMU_CAP_EXCLUSIVE                  0x10
179 #define PERF_PMU_CAP_ITRACE                     0x20
180 
181 /**
182  * struct pmu - generic performance monitoring unit
183  */
184 struct pmu {
185         struct list_head                entry;
186 
187         struct module                   *module;
188         struct device                   *dev;
189         const struct attribute_group    **attr_groups;
190         const char                      *name;
191         int                             type;
192 
193         /*
194          * various common per-pmu feature flags
195          */
196         int                             capabilities;
197 
198         int * __percpu                  pmu_disable_count;
199         struct perf_cpu_context * __percpu pmu_cpu_context;
200         atomic_t                        exclusive_cnt; /* < 0: cpu; > 0: tsk */
201         int                             task_ctx_nr;
202         int                             hrtimer_interval_ms;
203 
204         /*
205          * Fully disable/enable this PMU, can be used to protect from the PMI
206          * as well as for lazy/batch writing of the MSRs.
207          */
208         void (*pmu_enable)              (struct pmu *pmu); /* optional */
209         void (*pmu_disable)             (struct pmu *pmu); /* optional */
210 
211         /*
212          * Try and initialize the event for this PMU.
213          * Should return -ENOENT when the @event doesn't match this PMU.
214          */
215         int (*event_init)               (struct perf_event *event);
216 
217         /*
218          * Notification that the event was mapped or unmapped.  Called
219          * in the context of the mapping task.
220          */
221         void (*event_mapped)            (struct perf_event *event); /*optional*/
222         void (*event_unmapped)          (struct perf_event *event); /*optional*/
223 
224 #define PERF_EF_START   0x01            /* start the counter when adding    */
225 #define PERF_EF_RELOAD  0x02            /* reload the counter when starting */
226 #define PERF_EF_UPDATE  0x04            /* update the counter when stopping */
227 
228         /*
229          * Adds/Removes a counter to/from the PMU, can be done inside
230          * a transaction, see the ->*_txn() methods.
231          */
232         int  (*add)                     (struct perf_event *event, int flags);
233         void (*del)                     (struct perf_event *event, int flags);
234 
235         /*
236          * Starts/Stops a counter present on the PMU. The PMI handler
237          * should stop the counter when perf_event_overflow() returns
238          * !0. ->start() will be used to continue.
239          */
240         void (*start)                   (struct perf_event *event, int flags);
241         void (*stop)                    (struct perf_event *event, int flags);
242 
243         /*
244          * Updates the counter value of the event.
245          */
246         void (*read)                    (struct perf_event *event);
247 
248         /*
249          * Group events scheduling is treated as a transaction, add
250          * group events as a whole and perform one schedulability test.
251          * If the test fails, roll back the whole group
252          *
253          * Start the transaction, after this ->add() doesn't need to
254          * do schedulability tests.
255          */
256         void (*start_txn)               (struct pmu *pmu); /* optional */
257         /*
258          * If ->start_txn() disabled the ->add() schedulability test
259          * then ->commit_txn() is required to perform one. On success
260          * the transaction is closed. On error the transaction is kept
261          * open until ->cancel_txn() is called.
262          */
263         int  (*commit_txn)              (struct pmu *pmu); /* optional */
264         /*
265          * Will cancel the transaction, assumes ->del() is called
266          * for each successful ->add() during the transaction.
267          */
268         void (*cancel_txn)              (struct pmu *pmu); /* optional */
269 
270         /*
271          * Will return the value for perf_event_mmap_page::index for this event,
272          * if no implementation is provided it will default to: event->hw.idx + 1.
273          */
274         int (*event_idx)                (struct perf_event *event); /*optional */
275 
276         /*
277          * context-switches callback
278          */
279         void (*sched_task)              (struct perf_event_context *ctx,
280                                         bool sched_in);
281         /*
282          * PMU specific data size
283          */
284         size_t                          task_ctx_size;
285 
286 
287         /*
288          * Return the count value for a counter.
289          */
290         u64 (*count)                    (struct perf_event *event); /*optional*/
291 
292         /*
293          * Set up pmu-private data structures for an AUX area
294          */
295         void *(*setup_aux)              (int cpu, void **pages,
296                                          int nr_pages, bool overwrite);
297                                         /* optional */
298 
299         /*
300          * Free pmu-private AUX data structures
301          */
302         void (*free_aux)                (void *aux); /* optional */
303 
304         /*
305          * Filter events for PMU-specific reasons.
306          */
307         int (*filter_match)             (struct perf_event *event); /* optional */
308 };
309 
310 /**
311  * enum perf_event_active_state - the states of a event
312  */
313 enum perf_event_active_state {
314         PERF_EVENT_STATE_EXIT           = -3,
315         PERF_EVENT_STATE_ERROR          = -2,
316         PERF_EVENT_STATE_OFF            = -1,
317         PERF_EVENT_STATE_INACTIVE       =  0,
318         PERF_EVENT_STATE_ACTIVE         =  1,
319 };
320 
321 struct file;
322 struct perf_sample_data;
323 
324 typedef void (*perf_overflow_handler_t)(struct perf_event *,
325                                         struct perf_sample_data *,
326                                         struct pt_regs *regs);
327 
328 enum perf_group_flag {
329         PERF_GROUP_SOFTWARE             = 0x1,
330 };
331 
332 #define SWEVENT_HLIST_BITS              8
333 #define SWEVENT_HLIST_SIZE              (1 << SWEVENT_HLIST_BITS)
334 
335 struct swevent_hlist {
336         struct hlist_head               heads[SWEVENT_HLIST_SIZE];
337         struct rcu_head                 rcu_head;
338 };
339 
340 #define PERF_ATTACH_CONTEXT     0x01
341 #define PERF_ATTACH_GROUP       0x02
342 #define PERF_ATTACH_TASK        0x04
343 #define PERF_ATTACH_TASK_DATA   0x08
344 
345 struct perf_cgroup;
346 struct ring_buffer;
347 
348 /**
349  * struct perf_event - performance event kernel representation:
350  */
351 struct perf_event {
352 #ifdef CONFIG_PERF_EVENTS
353         /*
354          * entry onto perf_event_context::event_list;
355          *   modifications require ctx->lock
356          *   RCU safe iterations.
357          */
358         struct list_head                event_entry;
359 
360         /*
361          * XXX: group_entry and sibling_list should be mutually exclusive;
362          * either you're a sibling on a group, or you're the group leader.
363          * Rework the code to always use the same list element.
364          *
365          * Locked for modification by both ctx->mutex and ctx->lock; holding
366          * either sufficies for read.
367          */
368         struct list_head                group_entry;
369         struct list_head                sibling_list;
370 
371         /*
372          * We need storage to track the entries in perf_pmu_migrate_context; we
373          * cannot use the event_entry because of RCU and we want to keep the
374          * group in tact which avoids us using the other two entries.
375          */
376         struct list_head                migrate_entry;
377 
378         struct hlist_node               hlist_entry;
379         struct list_head                active_entry;
380         int                             nr_siblings;
381         int                             group_flags;
382         struct perf_event               *group_leader;
383         struct pmu                      *pmu;
384 
385         enum perf_event_active_state    state;
386         unsigned int                    attach_state;
387         local64_t                       count;
388         atomic64_t                      child_count;
389 
390         /*
391          * These are the total time in nanoseconds that the event
392          * has been enabled (i.e. eligible to run, and the task has
393          * been scheduled in, if this is a per-task event)
394          * and running (scheduled onto the CPU), respectively.
395          *
396          * They are computed from tstamp_enabled, tstamp_running and
397          * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
398          */
399         u64                             total_time_enabled;
400         u64                             total_time_running;
401 
402         /*
403          * These are timestamps used for computing total_time_enabled
404          * and total_time_running when the event is in INACTIVE or
405          * ACTIVE state, measured in nanoseconds from an arbitrary point
406          * in time.
407          * tstamp_enabled: the notional time when the event was enabled
408          * tstamp_running: the notional time when the event was scheduled on
409          * tstamp_stopped: in INACTIVE state, the notional time when the
410          *      event was scheduled off.
411          */
412         u64                             tstamp_enabled;
413         u64                             tstamp_running;
414         u64                             tstamp_stopped;
415 
416         /*
417          * timestamp shadows the actual context timing but it can
418          * be safely used in NMI interrupt context. It reflects the
419          * context time as it was when the event was last scheduled in.
420          *
421          * ctx_time already accounts for ctx->timestamp. Therefore to
422          * compute ctx_time for a sample, simply add perf_clock().
423          */
424         u64                             shadow_ctx_time;
425 
426         struct perf_event_attr          attr;
427         u16                             header_size;
428         u16                             id_header_size;
429         u16                             read_size;
430         struct hw_perf_event            hw;
431 
432         struct perf_event_context       *ctx;
433         atomic_long_t                   refcount;
434 
435         /*
436          * These accumulate total time (in nanoseconds) that children
437          * events have been enabled and running, respectively.
438          */
439         atomic64_t                      child_total_time_enabled;
440         atomic64_t                      child_total_time_running;
441 
442         /*
443          * Protect attach/detach and child_list:
444          */
445         struct mutex                    child_mutex;
446         struct list_head                child_list;
447         struct perf_event               *parent;
448 
449         int                             oncpu;
450         int                             cpu;
451 
452         struct list_head                owner_entry;
453         struct task_struct              *owner;
454 
455         /* mmap bits */
456         struct mutex                    mmap_mutex;
457         atomic_t                        mmap_count;
458 
459         struct ring_buffer              *rb;
460         struct list_head                rb_entry;
461         unsigned long                   rcu_batches;
462         int                             rcu_pending;
463 
464         /* poll related */
465         wait_queue_head_t               waitq;
466         struct fasync_struct            *fasync;
467 
468         /* delayed work for NMIs and such */
469         int                             pending_wakeup;
470         int                             pending_kill;
471         int                             pending_disable;
472         struct irq_work                 pending;
473 
474         atomic_t                        event_limit;
475 
476         void (*destroy)(struct perf_event *);
477         struct rcu_head                 rcu_head;
478 
479         struct pid_namespace            *ns;
480         u64                             id;
481 
482         u64                             (*clock)(void);
483         perf_overflow_handler_t         overflow_handler;
484         void                            *overflow_handler_context;
485 
486 #ifdef CONFIG_EVENT_TRACING
487         struct trace_event_call         *tp_event;
488         struct event_filter             *filter;
489 #ifdef CONFIG_FUNCTION_TRACER
490         struct ftrace_ops               ftrace_ops;
491 #endif
492 #endif
493 
494 #ifdef CONFIG_CGROUP_PERF
495         struct perf_cgroup              *cgrp; /* cgroup event is attach to */
496         int                             cgrp_defer_enabled;
497 #endif
498 
499 #endif /* CONFIG_PERF_EVENTS */
500 };
501 
502 /**
503  * struct perf_event_context - event context structure
504  *
505  * Used as a container for task events and CPU events as well:
506  */
507 struct perf_event_context {
508         struct pmu                      *pmu;
509         /*
510          * Protect the states of the events in the list,
511          * nr_active, and the list:
512          */
513         raw_spinlock_t                  lock;
514         /*
515          * Protect the list of events.  Locking either mutex or lock
516          * is sufficient to ensure the list doesn't change; to change
517          * the list you need to lock both the mutex and the spinlock.
518          */
519         struct mutex                    mutex;
520 
521         struct list_head                active_ctx_list;
522         struct list_head                pinned_groups;
523         struct list_head                flexible_groups;
524         struct list_head                event_list;
525         int                             nr_events;
526         int                             nr_active;
527         int                             is_active;
528         int                             nr_stat;
529         int                             nr_freq;
530         int                             rotate_disable;
531         atomic_t                        refcount;
532         struct task_struct              *task;
533 
534         /*
535          * Context clock, runs when context enabled.
536          */
537         u64                             time;
538         u64                             timestamp;
539 
540         /*
541          * These fields let us detect when two contexts have both
542          * been cloned (inherited) from a common ancestor.
543          */
544         struct perf_event_context       *parent_ctx;
545         u64                             parent_gen;
546         u64                             generation;
547         int                             pin_count;
548         int                             nr_cgroups;      /* cgroup evts */
549         void                            *task_ctx_data; /* pmu specific data */
550         struct rcu_head                 rcu_head;
551 
552         struct delayed_work             orphans_remove;
553         bool                            orphans_remove_sched;
554 };
555 
556 /*
557  * Number of contexts where an event can trigger:
558  *      task, softirq, hardirq, nmi.
559  */
560 #define PERF_NR_CONTEXTS        4
561 
562 /**
563  * struct perf_event_cpu_context - per cpu event context structure
564  */
565 struct perf_cpu_context {
566         struct perf_event_context       ctx;
567         struct perf_event_context       *task_ctx;
568         int                             active_oncpu;
569         int                             exclusive;
570 
571         raw_spinlock_t                  hrtimer_lock;
572         struct hrtimer                  hrtimer;
573         ktime_t                         hrtimer_interval;
574         unsigned int                    hrtimer_active;
575 
576         struct pmu                      *unique_pmu;
577         struct perf_cgroup              *cgrp;
578 };
579 
580 struct perf_output_handle {
581         struct perf_event               *event;
582         struct ring_buffer              *rb;
583         unsigned long                   wakeup;
584         unsigned long                   size;
585         union {
586                 void                    *addr;
587                 unsigned long           head;
588         };
589         int                             page;
590 };
591 
592 #ifdef CONFIG_CGROUP_PERF
593 
594 /*
595  * perf_cgroup_info keeps track of time_enabled for a cgroup.
596  * This is a per-cpu dynamically allocated data structure.
597  */
598 struct perf_cgroup_info {
599         u64                             time;
600         u64                             timestamp;
601 };
602 
603 struct perf_cgroup {
604         struct cgroup_subsys_state      css;
605         struct perf_cgroup_info __percpu *info;
606 };
607 
608 /*
609  * Must ensure cgroup is pinned (css_get) before calling
610  * this function. In other words, we cannot call this function
611  * if there is no cgroup event for the current CPU context.
612  */
613 static inline struct perf_cgroup *
614 perf_cgroup_from_task(struct task_struct *task)
615 {
616         return container_of(task_css(task, perf_event_cgrp_id),
617                             struct perf_cgroup, css);
618 }
619 #endif /* CONFIG_CGROUP_PERF */
620 
621 #ifdef CONFIG_PERF_EVENTS
622 
623 extern void *perf_aux_output_begin(struct perf_output_handle *handle,
624                                    struct perf_event *event);
625 extern void perf_aux_output_end(struct perf_output_handle *handle,
626                                 unsigned long size, bool truncated);
627 extern int perf_aux_output_skip(struct perf_output_handle *handle,
628                                 unsigned long size);
629 extern void *perf_get_aux(struct perf_output_handle *handle);
630 
631 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
632 extern void perf_pmu_unregister(struct pmu *pmu);
633 
634 extern int perf_num_counters(void);
635 extern const char *perf_pmu_name(void);
636 extern void __perf_event_task_sched_in(struct task_struct *prev,
637                                        struct task_struct *task);
638 extern void __perf_event_task_sched_out(struct task_struct *prev,
639                                         struct task_struct *next);
640 extern int perf_event_init_task(struct task_struct *child);
641 extern void perf_event_exit_task(struct task_struct *child);
642 extern void perf_event_free_task(struct task_struct *task);
643 extern void perf_event_delayed_put(struct task_struct *task);
644 extern struct perf_event *perf_event_get(unsigned int fd);
645 extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event);
646 extern void perf_event_print_debug(void);
647 extern void perf_pmu_disable(struct pmu *pmu);
648 extern void perf_pmu_enable(struct pmu *pmu);
649 extern void perf_sched_cb_dec(struct pmu *pmu);
650 extern void perf_sched_cb_inc(struct pmu *pmu);
651 extern int perf_event_task_disable(void);
652 extern int perf_event_task_enable(void);
653 extern int perf_event_refresh(struct perf_event *event, int refresh);
654 extern void perf_event_update_userpage(struct perf_event *event);
655 extern int perf_event_release_kernel(struct perf_event *event);
656 extern struct perf_event *
657 perf_event_create_kernel_counter(struct perf_event_attr *attr,
658                                 int cpu,
659                                 struct task_struct *task,
660                                 perf_overflow_handler_t callback,
661                                 void *context);
662 extern void perf_pmu_migrate_context(struct pmu *pmu,
663                                 int src_cpu, int dst_cpu);
664 extern u64 perf_event_read_local(struct perf_event *event);
665 extern u64 perf_event_read_value(struct perf_event *event,
666                                  u64 *enabled, u64 *running);
667 
668 
669 struct perf_sample_data {
670         /*
671          * Fields set by perf_sample_data_init(), group so as to
672          * minimize the cachelines touched.
673          */
674         u64                             addr;
675         struct perf_raw_record          *raw;
676         struct perf_branch_stack        *br_stack;
677         u64                             period;
678         u64                             weight;
679         u64                             txn;
680         union  perf_mem_data_src        data_src;
681 
682         /*
683          * The other fields, optionally {set,used} by
684          * perf_{prepare,output}_sample().
685          */
686         u64                             type;
687         u64                             ip;
688         struct {
689                 u32     pid;
690                 u32     tid;
691         }                               tid_entry;
692         u64                             time;
693         u64                             id;
694         u64                             stream_id;
695         struct {
696                 u32     cpu;
697                 u32     reserved;
698         }                               cpu_entry;
699         struct perf_callchain_entry     *callchain;
700 
701         /*
702          * regs_user may point to task_pt_regs or to regs_user_copy, depending
703          * on arch details.
704          */
705         struct perf_regs                regs_user;
706         struct pt_regs                  regs_user_copy;
707 
708         struct perf_regs                regs_intr;
709         u64                             stack_user_size;
710 } ____cacheline_aligned;
711 
712 /* default value for data source */
713 #define PERF_MEM_NA (PERF_MEM_S(OP, NA)   |\
714                     PERF_MEM_S(LVL, NA)   |\
715                     PERF_MEM_S(SNOOP, NA) |\
716                     PERF_MEM_S(LOCK, NA)  |\
717                     PERF_MEM_S(TLB, NA))
718 
719 static inline void perf_sample_data_init(struct perf_sample_data *data,
720                                          u64 addr, u64 period)
721 {
722         /* remaining struct members initialized in perf_prepare_sample() */
723         data->addr = addr;
724         data->raw  = NULL;
725         data->br_stack = NULL;
726         data->period = period;
727         data->weight = 0;
728         data->data_src.val = PERF_MEM_NA;
729         data->txn = 0;
730 }
731 
732 extern void perf_output_sample(struct perf_output_handle *handle,
733                                struct perf_event_header *header,
734                                struct perf_sample_data *data,
735                                struct perf_event *event);
736 extern void perf_prepare_sample(struct perf_event_header *header,
737                                 struct perf_sample_data *data,
738                                 struct perf_event *event,
739                                 struct pt_regs *regs);
740 
741 extern int perf_event_overflow(struct perf_event *event,
742                                  struct perf_sample_data *data,
743                                  struct pt_regs *regs);
744 
745 extern void perf_event_output(struct perf_event *event,
746                                 struct perf_sample_data *data,
747                                 struct pt_regs *regs);
748 
749 extern void
750 perf_event_header__init_id(struct perf_event_header *header,
751                            struct perf_sample_data *data,
752                            struct perf_event *event);
753 extern void
754 perf_event__output_id_sample(struct perf_event *event,
755                              struct perf_output_handle *handle,
756                              struct perf_sample_data *sample);
757 
758 extern void
759 perf_log_lost_samples(struct perf_event *event, u64 lost);
760 
761 static inline bool is_sampling_event(struct perf_event *event)
762 {
763         return event->attr.sample_period != 0;
764 }
765 
766 /*
767  * Return 1 for a software event, 0 for a hardware event
768  */
769 static inline int is_software_event(struct perf_event *event)
770 {
771         return event->pmu->task_ctx_nr == perf_sw_context;
772 }
773 
774 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
775 
776 extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64);
777 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
778 
779 #ifndef perf_arch_fetch_caller_regs
780 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
781 #endif
782 
783 /*
784  * Take a snapshot of the regs. Skip ip and frame pointer to
785  * the nth caller. We only need a few of the regs:
786  * - ip for PERF_SAMPLE_IP
787  * - cs for user_mode() tests
788  * - bp for callchains
789  * - eflags, for future purposes, just in case
790  */
791 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
792 {
793         memset(regs, 0, sizeof(*regs));
794 
795         perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
796 }
797 
798 static __always_inline void
799 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
800 {
801         if (static_key_false(&perf_swevent_enabled[event_id]))
802                 __perf_sw_event(event_id, nr, regs, addr);
803 }
804 
805 DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]);
806 
807 /*
808  * 'Special' version for the scheduler, it hard assumes no recursion,
809  * which is guaranteed by us not actually scheduling inside other swevents
810  * because those disable preemption.
811  */
812 static __always_inline void
813 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)
814 {
815         if (static_key_false(&perf_swevent_enabled[event_id])) {
816                 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
817 
818                 perf_fetch_caller_regs(regs);
819                 ___perf_sw_event(event_id, nr, regs, addr);
820         }
821 }
822 
823 extern struct static_key_deferred perf_sched_events;
824 
825 static __always_inline bool
826 perf_sw_migrate_enabled(void)
827 {
828         if (static_key_false(&perf_swevent_enabled[PERF_COUNT_SW_CPU_MIGRATIONS]))
829                 return true;
830         return false;
831 }
832 
833 static inline void perf_event_task_migrate(struct task_struct *task)
834 {
835         if (perf_sw_migrate_enabled())
836                 task->sched_migrated = 1;
837 }
838 
839 static inline void perf_event_task_sched_in(struct task_struct *prev,
840                                             struct task_struct *task)
841 {
842         if (static_key_false(&perf_sched_events.key))
843                 __perf_event_task_sched_in(prev, task);
844 
845         if (perf_sw_migrate_enabled() && task->sched_migrated) {
846                 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
847 
848                 perf_fetch_caller_regs(regs);
849                 ___perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, regs, 0);
850                 task->sched_migrated = 0;
851         }
852 }
853 
854 static inline void perf_event_task_sched_out(struct task_struct *prev,
855                                              struct task_struct *next)
856 {
857         perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);
858 
859         if (static_key_false(&perf_sched_events.key))
860                 __perf_event_task_sched_out(prev, next);
861 }
862 
863 static inline u64 __perf_event_count(struct perf_event *event)
864 {
865         return local64_read(&event->count) + atomic64_read(&event->child_count);
866 }
867 
868 extern void perf_event_mmap(struct vm_area_struct *vma);
869 extern struct perf_guest_info_callbacks *perf_guest_cbs;
870 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
871 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
872 
873 extern void perf_event_exec(void);
874 extern void perf_event_comm(struct task_struct *tsk, bool exec);
875 extern void perf_event_fork(struct task_struct *tsk);
876 
877 /* Callchains */
878 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
879 
880 extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
881 extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
882 
883 static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
884 {
885         if (entry->nr < PERF_MAX_STACK_DEPTH)
886                 entry->ip[entry->nr++] = ip;
887 }
888 
889 extern int sysctl_perf_event_paranoid;
890 extern int sysctl_perf_event_mlock;
891 extern int sysctl_perf_event_sample_rate;
892 extern int sysctl_perf_cpu_time_max_percent;
893 
894 extern void perf_sample_event_took(u64 sample_len_ns);
895 
896 extern int perf_proc_update_handler(struct ctl_table *table, int write,
897                 void __user *buffer, size_t *lenp,
898                 loff_t *ppos);
899 extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
900                 void __user *buffer, size_t *lenp,
901                 loff_t *ppos);
902 
903 
904 static inline bool perf_paranoid_tracepoint_raw(void)
905 {
906         return sysctl_perf_event_paranoid > -1;
907 }
908 
909 static inline bool perf_paranoid_cpu(void)
910 {
911         return sysctl_perf_event_paranoid > 0;
912 }
913 
914 static inline bool perf_paranoid_kernel(void)
915 {
916         return sysctl_perf_event_paranoid > 1;
917 }
918 
919 extern void perf_event_init(void);
920 extern void perf_tp_event(u64 addr, u64 count, void *record,
921                           int entry_size, struct pt_regs *regs,
922                           struct hlist_head *head, int rctx,
923                           struct task_struct *task);
924 extern void perf_bp_event(struct perf_event *event, void *data);
925 
926 #ifndef perf_misc_flags
927 # define perf_misc_flags(regs) \
928                 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
929 # define perf_instruction_pointer(regs) instruction_pointer(regs)
930 #endif
931 
932 static inline bool has_branch_stack(struct perf_event *event)
933 {
934         return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
935 }
936 
937 static inline bool needs_branch_stack(struct perf_event *event)
938 {
939         return event->attr.branch_sample_type != 0;
940 }
941 
942 static inline bool has_aux(struct perf_event *event)
943 {
944         return event->pmu->setup_aux;
945 }
946 
947 extern int perf_output_begin(struct perf_output_handle *handle,
948                              struct perf_event *event, unsigned int size);
949 extern void perf_output_end(struct perf_output_handle *handle);
950 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
951                              const void *buf, unsigned int len);
952 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
953                                      unsigned int len);
954 extern int perf_swevent_get_recursion_context(void);
955 extern void perf_swevent_put_recursion_context(int rctx);
956 extern u64 perf_swevent_set_period(struct perf_event *event);
957 extern void perf_event_enable(struct perf_event *event);
958 extern void perf_event_disable(struct perf_event *event);
959 extern int __perf_event_disable(void *info);
960 extern void perf_event_task_tick(void);
961 #else /* !CONFIG_PERF_EVENTS: */
962 static inline void *
963 perf_aux_output_begin(struct perf_output_handle *handle,
964                       struct perf_event *event)                         { return NULL; }
965 static inline void
966 perf_aux_output_end(struct perf_output_handle *handle, unsigned long size,
967                     bool truncated)                                     { }
968 static inline int
969 perf_aux_output_skip(struct perf_output_handle *handle,
970                      unsigned long size)                                { return -EINVAL; }
971 static inline void *
972 perf_get_aux(struct perf_output_handle *handle)                         { return NULL; }
973 static inline void
974 perf_event_task_migrate(struct task_struct *task)                       { }
975 static inline void
976 perf_event_task_sched_in(struct task_struct *prev,
977                          struct task_struct *task)                      { }
978 static inline void
979 perf_event_task_sched_out(struct task_struct *prev,
980                           struct task_struct *next)                     { }
981 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
982 static inline void perf_event_exit_task(struct task_struct *child)      { }
983 static inline void perf_event_free_task(struct task_struct *task)       { }
984 static inline void perf_event_delayed_put(struct task_struct *task)     { }
985 static inline struct perf_event *perf_event_get(unsigned int fd)        { return ERR_PTR(-EINVAL); }
986 static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event)
987 {
988         return ERR_PTR(-EINVAL);
989 }
990 static inline u64 perf_event_read_local(struct perf_event *event)       { return -EINVAL; }
991 static inline void perf_event_print_debug(void)                         { }
992 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
993 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
994 static inline int perf_event_refresh(struct perf_event *event, int refresh)
995 {
996         return -EINVAL;
997 }
998 
999 static inline void
1000 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)     { }
1001 static inline void
1002 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)                     { }
1003 static inline void
1004 perf_bp_event(struct perf_event *event, void *data)                     { }
1005 
1006 static inline int perf_register_guest_info_callbacks
1007 (struct perf_guest_info_callbacks *callbacks)                           { return 0; }
1008 static inline int perf_unregister_guest_info_callbacks
1009 (struct perf_guest_info_callbacks *callbacks)                           { return 0; }
1010 
1011 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
1012 static inline void perf_event_exec(void)                                { }
1013 static inline void perf_event_comm(struct task_struct *tsk, bool exec)  { }
1014 static inline void perf_event_fork(struct task_struct *tsk)             { }
1015 static inline void perf_event_init(void)                                { }
1016 static inline int  perf_swevent_get_recursion_context(void)             { return -1; }
1017 static inline void perf_swevent_put_recursion_context(int rctx)         { }
1018 static inline u64 perf_swevent_set_period(struct perf_event *event)     { return 0; }
1019 static inline void perf_event_enable(struct perf_event *event)          { }
1020 static inline void perf_event_disable(struct perf_event *event)         { }
1021 static inline int __perf_event_disable(void *info)                      { return -1; }
1022 static inline void perf_event_task_tick(void)                           { }
1023 static inline int perf_event_release_kernel(struct perf_event *event)   { return 0; }
1024 #endif
1025 
1026 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
1027 extern bool perf_event_can_stop_tick(void);
1028 #else
1029 static inline bool perf_event_can_stop_tick(void)                       { return true; }
1030 #endif
1031 
1032 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
1033 extern void perf_restore_debug_store(void);
1034 #else
1035 static inline void perf_restore_debug_store(void)                       { }
1036 #endif
1037 
1038 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
1039 
1040 /*
1041  * This has to have a higher priority than migration_notifier in sched/core.c.
1042  */
1043 #define perf_cpu_notifier(fn)                                           \
1044 do {                                                                    \
1045         static struct notifier_block fn##_nb =                          \
1046                 { .notifier_call = fn, .priority = CPU_PRI_PERF };      \
1047         unsigned long cpu = smp_processor_id();                         \
1048         unsigned long flags;                                            \
1049                                                                         \
1050         cpu_notifier_register_begin();                                  \
1051         fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,                     \
1052                 (void *)(unsigned long)cpu);                            \
1053         local_irq_save(flags);                                          \
1054         fn(&fn##_nb, (unsigned long)CPU_STARTING,                       \
1055                 (void *)(unsigned long)cpu);                            \
1056         local_irq_restore(flags);                                       \
1057         fn(&fn##_nb, (unsigned long)CPU_ONLINE,                         \
1058                 (void *)(unsigned long)cpu);                            \
1059         __register_cpu_notifier(&fn##_nb);                              \
1060         cpu_notifier_register_done();                                   \
1061 } while (0)
1062 
1063 /*
1064  * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
1065  * callback for already online CPUs.
1066  */
1067 #define __perf_cpu_notifier(fn)                                         \
1068 do {                                                                    \
1069         static struct notifier_block fn##_nb =                          \
1070                 { .notifier_call = fn, .priority = CPU_PRI_PERF };      \
1071                                                                         \
1072         __register_cpu_notifier(&fn##_nb);                              \
1073 } while (0)
1074 
1075 struct perf_pmu_events_attr {
1076         struct device_attribute attr;
1077         u64 id;
1078         const char *event_str;
1079 };
1080 
1081 ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
1082                               char *page);
1083 
1084 #define PMU_EVENT_ATTR(_name, _var, _id, _show)                         \
1085 static struct perf_pmu_events_attr _var = {                             \
1086         .attr = __ATTR(_name, 0444, _show, NULL),                       \
1087         .id   =  _id,                                                   \
1088 };
1089 
1090 #define PMU_EVENT_ATTR_STRING(_name, _var, _str)                            \
1091 static struct perf_pmu_events_attr _var = {                                 \
1092         .attr           = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \
1093         .id             = 0,                                                \
1094         .event_str      = _str,                                             \
1095 };
1096 
1097 #define PMU_FORMAT_ATTR(_name, _format)                                 \
1098 static ssize_t                                                          \
1099 _name##_show(struct device *dev,                                        \
1100                                struct device_attribute *attr,           \
1101                                char *page)                              \
1102 {                                                                       \
1103         BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);                     \
1104         return sprintf(page, _format "\n");                             \
1105 }                                                                       \
1106                                                                         \
1107 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
1108 
1109 #endif /* _LINUX_PERF_EVENT_H */
1110 

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