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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[0]; /* /proc/sys/kernel/perf_event_max_stack */
 62 };
 63 
 64 struct perf_callchain_entry_ctx {
 65         struct perf_callchain_entry *entry;
 66         u32                         max_stack;
 67         u32                         nr;
 68         short                       contexts;
 69         bool                        contexts_maxed;
 70 };
 71 
 72 typedef unsigned long (*perf_copy_f)(void *dst, const void *src,
 73                                      unsigned long off, unsigned long len);
 74 
 75 struct perf_raw_frag {
 76         union {
 77                 struct perf_raw_frag    *next;
 78                 unsigned long           pad;
 79         };
 80         perf_copy_f                     copy;
 81         void                            *data;
 82         u32                             size;
 83 } __packed;
 84 
 85 struct perf_raw_record {
 86         struct perf_raw_frag            frag;
 87         u32                             size;
 88 };
 89 
 90 /*
 91  * branch stack layout:
 92  *  nr: number of taken branches stored in entries[]
 93  *
 94  * Note that nr can vary from sample to sample
 95  * branches (to, from) are stored from most recent
 96  * to least recent, i.e., entries[0] contains the most
 97  * recent branch.
 98  */
 99 struct perf_branch_stack {
100         __u64                           nr;
101         struct perf_branch_entry        entries[0];
102 };
103 
104 struct task_struct;
105 
106 /*
107  * extra PMU register associated with an event
108  */
109 struct hw_perf_event_extra {
110         u64             config; /* register value */
111         unsigned int    reg;    /* register address or index */
112         int             alloc;  /* extra register already allocated */
113         int             idx;    /* index in shared_regs->regs[] */
114 };
115 
116 /**
117  * struct hw_perf_event - performance event hardware details:
118  */
119 struct hw_perf_event {
120 #ifdef CONFIG_PERF_EVENTS
121         union {
122                 struct { /* hardware */
123                         u64             config;
124                         u64             last_tag;
125                         unsigned long   config_base;
126                         unsigned long   event_base;
127                         int             event_base_rdpmc;
128                         int             idx;
129                         int             last_cpu;
130                         int             flags;
131 
132                         struct hw_perf_event_extra extra_reg;
133                         struct hw_perf_event_extra branch_reg;
134                 };
135                 struct { /* software */
136                         struct hrtimer  hrtimer;
137                 };
138                 struct { /* tracepoint */
139                         /* for tp_event->class */
140                         struct list_head        tp_list;
141                 };
142                 struct { /* intel_cqm */
143                         int                     cqm_state;
144                         u32                     cqm_rmid;
145                         int                     is_group_event;
146                         struct list_head        cqm_events_entry;
147                         struct list_head        cqm_groups_entry;
148                         struct list_head        cqm_group_entry;
149                 };
150                 struct { /* itrace */
151                         int                     itrace_started;
152                 };
153                 struct { /* amd_power */
154                         u64     pwr_acc;
155                         u64     ptsc;
156                 };
157 #ifdef CONFIG_HAVE_HW_BREAKPOINT
158                 struct { /* breakpoint */
159                         /*
160                          * Crufty hack to avoid the chicken and egg
161                          * problem hw_breakpoint has with context
162                          * creation and event initalization.
163                          */
164                         struct arch_hw_breakpoint       info;
165                         struct list_head                bp_list;
166                 };
167 #endif
168         };
169         /*
170          * If the event is a per task event, this will point to the task in
171          * question. See the comment in perf_event_alloc().
172          */
173         struct task_struct              *target;
174 
175         /*
176          * PMU would store hardware filter configuration
177          * here.
178          */
179         void                            *addr_filters;
180 
181         /* Last sync'ed generation of filters */
182         unsigned long                   addr_filters_gen;
183 
184 /*
185  * hw_perf_event::state flags; used to track the PERF_EF_* state.
186  */
187 #define PERF_HES_STOPPED        0x01 /* the counter is stopped */
188 #define PERF_HES_UPTODATE       0x02 /* event->count up-to-date */
189 #define PERF_HES_ARCH           0x04
190 
191         int                             state;
192 
193         /*
194          * The last observed hardware counter value, updated with a
195          * local64_cmpxchg() such that pmu::read() can be called nested.
196          */
197         local64_t                       prev_count;
198 
199         /*
200          * The period to start the next sample with.
201          */
202         u64                             sample_period;
203 
204         /*
205          * The period we started this sample with.
206          */
207         u64                             last_period;
208 
209         /*
210          * However much is left of the current period; note that this is
211          * a full 64bit value and allows for generation of periods longer
212          * than hardware might allow.
213          */
214         local64_t                       period_left;
215 
216         /*
217          * State for throttling the event, see __perf_event_overflow() and
218          * perf_adjust_freq_unthr_context().
219          */
220         u64                             interrupts_seq;
221         u64                             interrupts;
222 
223         /*
224          * State for freq target events, see __perf_event_overflow() and
225          * perf_adjust_freq_unthr_context().
226          */
227         u64                             freq_time_stamp;
228         u64                             freq_count_stamp;
229 #endif
230 };
231 
232 struct perf_event;
233 
234 /*
235  * Common implementation detail of pmu::{start,commit,cancel}_txn
236  */
237 #define PERF_PMU_TXN_ADD  0x1           /* txn to add/schedule event on PMU */
238 #define PERF_PMU_TXN_READ 0x2           /* txn to read event group from PMU */
239 
240 /**
241  * pmu::capabilities flags
242  */
243 #define PERF_PMU_CAP_NO_INTERRUPT               0x01
244 #define PERF_PMU_CAP_NO_NMI                     0x02
245 #define PERF_PMU_CAP_AUX_NO_SG                  0x04
246 #define PERF_PMU_CAP_AUX_SW_DOUBLEBUF           0x08
247 #define PERF_PMU_CAP_EXCLUSIVE                  0x10
248 #define PERF_PMU_CAP_ITRACE                     0x20
249 #define PERF_PMU_CAP_HETEROGENEOUS_CPUS         0x40
250 
251 /**
252  * struct pmu - generic performance monitoring unit
253  */
254 struct pmu {
255         struct list_head                entry;
256 
257         struct module                   *module;
258         struct device                   *dev;
259         const struct attribute_group    **attr_groups;
260         const char                      *name;
261         int                             type;
262 
263         /*
264          * various common per-pmu feature flags
265          */
266         int                             capabilities;
267 
268         int * __percpu                  pmu_disable_count;
269         struct perf_cpu_context * __percpu pmu_cpu_context;
270         atomic_t                        exclusive_cnt; /* < 0: cpu; > 0: tsk */
271         int                             task_ctx_nr;
272         int                             hrtimer_interval_ms;
273 
274         /* number of address filters this PMU can do */
275         unsigned int                    nr_addr_filters;
276 
277         /*
278          * Fully disable/enable this PMU, can be used to protect from the PMI
279          * as well as for lazy/batch writing of the MSRs.
280          */
281         void (*pmu_enable)              (struct pmu *pmu); /* optional */
282         void (*pmu_disable)             (struct pmu *pmu); /* optional */
283 
284         /*
285          * Try and initialize the event for this PMU.
286          *
287          * Returns:
288          *  -ENOENT     -- @event is not for this PMU
289          *
290          *  -ENODEV     -- @event is for this PMU but PMU not present
291          *  -EBUSY      -- @event is for this PMU but PMU temporarily unavailable
292          *  -EINVAL     -- @event is for this PMU but @event is not valid
293          *  -EOPNOTSUPP -- @event is for this PMU, @event is valid, but not supported
294          *  -EACCESS    -- @event is for this PMU, @event is valid, but no privilidges
295          *
296          *  0           -- @event is for this PMU and valid
297          *
298          * Other error return values are allowed.
299          */
300         int (*event_init)               (struct perf_event *event);
301 
302         /*
303          * Notification that the event was mapped or unmapped.  Called
304          * in the context of the mapping task.
305          */
306         void (*event_mapped)            (struct perf_event *event); /*optional*/
307         void (*event_unmapped)          (struct perf_event *event); /*optional*/
308 
309         /*
310          * Flags for ->add()/->del()/ ->start()/->stop(). There are
311          * matching hw_perf_event::state flags.
312          */
313 #define PERF_EF_START   0x01            /* start the counter when adding    */
314 #define PERF_EF_RELOAD  0x02            /* reload the counter when starting */
315 #define PERF_EF_UPDATE  0x04            /* update the counter when stopping */
316 
317         /*
318          * Adds/Removes a counter to/from the PMU, can be done inside a
319          * transaction, see the ->*_txn() methods.
320          *
321          * The add/del callbacks will reserve all hardware resources required
322          * to service the event, this includes any counter constraint
323          * scheduling etc.
324          *
325          * Called with IRQs disabled and the PMU disabled on the CPU the event
326          * is on.
327          *
328          * ->add() called without PERF_EF_START should result in the same state
329          *  as ->add() followed by ->stop().
330          *
331          * ->del() must always PERF_EF_UPDATE stop an event. If it calls
332          *  ->stop() that must deal with already being stopped without
333          *  PERF_EF_UPDATE.
334          */
335         int  (*add)                     (struct perf_event *event, int flags);
336         void (*del)                     (struct perf_event *event, int flags);
337 
338         /*
339          * Starts/Stops a counter present on the PMU.
340          *
341          * The PMI handler should stop the counter when perf_event_overflow()
342          * returns !0. ->start() will be used to continue.
343          *
344          * Also used to change the sample period.
345          *
346          * Called with IRQs disabled and the PMU disabled on the CPU the event
347          * is on -- will be called from NMI context with the PMU generates
348          * NMIs.
349          *
350          * ->stop() with PERF_EF_UPDATE will read the counter and update
351          *  period/count values like ->read() would.
352          *
353          * ->start() with PERF_EF_RELOAD will reprogram the the counter
354          *  value, must be preceded by a ->stop() with PERF_EF_UPDATE.
355          */
356         void (*start)                   (struct perf_event *event, int flags);
357         void (*stop)                    (struct perf_event *event, int flags);
358 
359         /*
360          * Updates the counter value of the event.
361          *
362          * For sampling capable PMUs this will also update the software period
363          * hw_perf_event::period_left field.
364          */
365         void (*read)                    (struct perf_event *event);
366 
367         /*
368          * Group events scheduling is treated as a transaction, add
369          * group events as a whole and perform one schedulability test.
370          * If the test fails, roll back the whole group
371          *
372          * Start the transaction, after this ->add() doesn't need to
373          * do schedulability tests.
374          *
375          * Optional.
376          */
377         void (*start_txn)               (struct pmu *pmu, unsigned int txn_flags);
378         /*
379          * If ->start_txn() disabled the ->add() schedulability test
380          * then ->commit_txn() is required to perform one. On success
381          * the transaction is closed. On error the transaction is kept
382          * open until ->cancel_txn() is called.
383          *
384          * Optional.
385          */
386         int  (*commit_txn)              (struct pmu *pmu);
387         /*
388          * Will cancel the transaction, assumes ->del() is called
389          * for each successful ->add() during the transaction.
390          *
391          * Optional.
392          */
393         void (*cancel_txn)              (struct pmu *pmu);
394 
395         /*
396          * Will return the value for perf_event_mmap_page::index for this event,
397          * if no implementation is provided it will default to: event->hw.idx + 1.
398          */
399         int (*event_idx)                (struct perf_event *event); /*optional */
400 
401         /*
402          * context-switches callback
403          */
404         void (*sched_task)              (struct perf_event_context *ctx,
405                                         bool sched_in);
406         /*
407          * PMU specific data size
408          */
409         size_t                          task_ctx_size;
410 
411 
412         /*
413          * Return the count value for a counter.
414          */
415         u64 (*count)                    (struct perf_event *event); /*optional*/
416 
417         /*
418          * Set up pmu-private data structures for an AUX area
419          */
420         void *(*setup_aux)              (int cpu, void **pages,
421                                          int nr_pages, bool overwrite);
422                                         /* optional */
423 
424         /*
425          * Free pmu-private AUX data structures
426          */
427         void (*free_aux)                (void *aux); /* optional */
428 
429         /*
430          * Validate address range filters: make sure the HW supports the
431          * requested configuration and number of filters; return 0 if the
432          * supplied filters are valid, -errno otherwise.
433          *
434          * Runs in the context of the ioctl()ing process and is not serialized
435          * with the rest of the PMU callbacks.
436          */
437         int (*addr_filters_validate)    (struct list_head *filters);
438                                         /* optional */
439 
440         /*
441          * Synchronize address range filter configuration:
442          * translate hw-agnostic filters into hardware configuration in
443          * event::hw::addr_filters.
444          *
445          * Runs as a part of filter sync sequence that is done in ->start()
446          * callback by calling perf_event_addr_filters_sync().
447          *
448          * May (and should) traverse event::addr_filters::list, for which its
449          * caller provides necessary serialization.
450          */
451         void (*addr_filters_sync)       (struct perf_event *event);
452                                         /* optional */
453 
454         /*
455          * Filter events for PMU-specific reasons.
456          */
457         int (*filter_match)             (struct perf_event *event); /* optional */
458 };
459 
460 /**
461  * struct perf_addr_filter - address range filter definition
462  * @entry:      event's filter list linkage
463  * @inode:      object file's inode for file-based filters
464  * @offset:     filter range offset
465  * @size:       filter range size
466  * @range:      1: range, 0: address
467  * @filter:     1: filter/start, 0: stop
468  *
469  * This is a hardware-agnostic filter configuration as specified by the user.
470  */
471 struct perf_addr_filter {
472         struct list_head        entry;
473         struct inode            *inode;
474         unsigned long           offset;
475         unsigned long           size;
476         unsigned int            range   : 1,
477                                 filter  : 1;
478 };
479 
480 /**
481  * struct perf_addr_filters_head - container for address range filters
482  * @list:       list of filters for this event
483  * @lock:       spinlock that serializes accesses to the @list and event's
484  *              (and its children's) filter generations.
485  *
486  * A child event will use parent's @list (and therefore @lock), so they are
487  * bundled together; see perf_event_addr_filters().
488  */
489 struct perf_addr_filters_head {
490         struct list_head        list;
491         raw_spinlock_t          lock;
492 };
493 
494 /**
495  * enum perf_event_active_state - the states of a event
496  */
497 enum perf_event_active_state {
498         PERF_EVENT_STATE_DEAD           = -4,
499         PERF_EVENT_STATE_EXIT           = -3,
500         PERF_EVENT_STATE_ERROR          = -2,
501         PERF_EVENT_STATE_OFF            = -1,
502         PERF_EVENT_STATE_INACTIVE       =  0,
503         PERF_EVENT_STATE_ACTIVE         =  1,
504 };
505 
506 struct file;
507 struct perf_sample_data;
508 
509 typedef void (*perf_overflow_handler_t)(struct perf_event *,
510                                         struct perf_sample_data *,
511                                         struct pt_regs *regs);
512 
513 /*
514  * Event capabilities. For event_caps and groups caps.
515  *
516  * PERF_EV_CAP_SOFTWARE: Is a software event.
517  * PERF_EV_CAP_READ_ACTIVE_PKG: A CPU event (or cgroup event) that can be read
518  * from any CPU in the package where it is active.
519  */
520 #define PERF_EV_CAP_SOFTWARE            BIT(0)
521 #define PERF_EV_CAP_READ_ACTIVE_PKG     BIT(1)
522 
523 #define SWEVENT_HLIST_BITS              8
524 #define SWEVENT_HLIST_SIZE              (1 << SWEVENT_HLIST_BITS)
525 
526 struct swevent_hlist {
527         struct hlist_head               heads[SWEVENT_HLIST_SIZE];
528         struct rcu_head                 rcu_head;
529 };
530 
531 #define PERF_ATTACH_CONTEXT     0x01
532 #define PERF_ATTACH_GROUP       0x02
533 #define PERF_ATTACH_TASK        0x04
534 #define PERF_ATTACH_TASK_DATA   0x08
535 
536 struct perf_cgroup;
537 struct ring_buffer;
538 
539 struct pmu_event_list {
540         raw_spinlock_t          lock;
541         struct list_head        list;
542 };
543 
544 /**
545  * struct perf_event - performance event kernel representation:
546  */
547 struct perf_event {
548 #ifdef CONFIG_PERF_EVENTS
549         /*
550          * entry onto perf_event_context::event_list;
551          *   modifications require ctx->lock
552          *   RCU safe iterations.
553          */
554         struct list_head                event_entry;
555 
556         /*
557          * XXX: group_entry and sibling_list should be mutually exclusive;
558          * either you're a sibling on a group, or you're the group leader.
559          * Rework the code to always use the same list element.
560          *
561          * Locked for modification by both ctx->mutex and ctx->lock; holding
562          * either sufficies for read.
563          */
564         struct list_head                group_entry;
565         struct list_head                sibling_list;
566 
567         /*
568          * We need storage to track the entries in perf_pmu_migrate_context; we
569          * cannot use the event_entry because of RCU and we want to keep the
570          * group in tact which avoids us using the other two entries.
571          */
572         struct list_head                migrate_entry;
573 
574         struct hlist_node               hlist_entry;
575         struct list_head                active_entry;
576         int                             nr_siblings;
577 
578         /* Not serialized. Only written during event initialization. */
579         int                             event_caps;
580         /* The cumulative AND of all event_caps for events in this group. */
581         int                             group_caps;
582 
583         struct perf_event               *group_leader;
584         struct pmu                      *pmu;
585         void                            *pmu_private;
586 
587         enum perf_event_active_state    state;
588         unsigned int                    attach_state;
589         local64_t                       count;
590         atomic64_t                      child_count;
591 
592         /*
593          * These are the total time in nanoseconds that the event
594          * has been enabled (i.e. eligible to run, and the task has
595          * been scheduled in, if this is a per-task event)
596          * and running (scheduled onto the CPU), respectively.
597          *
598          * They are computed from tstamp_enabled, tstamp_running and
599          * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
600          */
601         u64                             total_time_enabled;
602         u64                             total_time_running;
603 
604         /*
605          * These are timestamps used for computing total_time_enabled
606          * and total_time_running when the event is in INACTIVE or
607          * ACTIVE state, measured in nanoseconds from an arbitrary point
608          * in time.
609          * tstamp_enabled: the notional time when the event was enabled
610          * tstamp_running: the notional time when the event was scheduled on
611          * tstamp_stopped: in INACTIVE state, the notional time when the
612          *      event was scheduled off.
613          */
614         u64                             tstamp_enabled;
615         u64                             tstamp_running;
616         u64                             tstamp_stopped;
617 
618         /*
619          * timestamp shadows the actual context timing but it can
620          * be safely used in NMI interrupt context. It reflects the
621          * context time as it was when the event was last scheduled in.
622          *
623          * ctx_time already accounts for ctx->timestamp. Therefore to
624          * compute ctx_time for a sample, simply add perf_clock().
625          */
626         u64                             shadow_ctx_time;
627 
628         struct perf_event_attr          attr;
629         u16                             header_size;
630         u16                             id_header_size;
631         u16                             read_size;
632         struct hw_perf_event            hw;
633 
634         struct perf_event_context       *ctx;
635         atomic_long_t                   refcount;
636 
637         /*
638          * These accumulate total time (in nanoseconds) that children
639          * events have been enabled and running, respectively.
640          */
641         atomic64_t                      child_total_time_enabled;
642         atomic64_t                      child_total_time_running;
643 
644         /*
645          * Protect attach/detach and child_list:
646          */
647         struct mutex                    child_mutex;
648         struct list_head                child_list;
649         struct perf_event               *parent;
650 
651         int                             oncpu;
652         int                             cpu;
653 
654         struct list_head                owner_entry;
655         struct task_struct              *owner;
656 
657         /* mmap bits */
658         struct mutex                    mmap_mutex;
659         atomic_t                        mmap_count;
660 
661         struct ring_buffer              *rb;
662         struct list_head                rb_entry;
663         unsigned long                   rcu_batches;
664         int                             rcu_pending;
665 
666         /* poll related */
667         wait_queue_head_t               waitq;
668         struct fasync_struct            *fasync;
669 
670         /* delayed work for NMIs and such */
671         int                             pending_wakeup;
672         int                             pending_kill;
673         int                             pending_disable;
674         struct irq_work                 pending;
675 
676         atomic_t                        event_limit;
677 
678         /* address range filters */
679         struct perf_addr_filters_head   addr_filters;
680         /* vma address array for file-based filders */
681         unsigned long                   *addr_filters_offs;
682         unsigned long                   addr_filters_gen;
683 
684         void (*destroy)(struct perf_event *);
685         struct rcu_head                 rcu_head;
686 
687         struct pid_namespace            *ns;
688         u64                             id;
689 
690         u64                             (*clock)(void);
691         perf_overflow_handler_t         overflow_handler;
692         void                            *overflow_handler_context;
693 #ifdef CONFIG_BPF_SYSCALL
694         perf_overflow_handler_t         orig_overflow_handler;
695         struct bpf_prog                 *prog;
696 #endif
697 
698 #ifdef CONFIG_EVENT_TRACING
699         struct trace_event_call         *tp_event;
700         struct event_filter             *filter;
701 #ifdef CONFIG_FUNCTION_TRACER
702         struct ftrace_ops               ftrace_ops;
703 #endif
704 #endif
705 
706 #ifdef CONFIG_CGROUP_PERF
707         struct perf_cgroup              *cgrp; /* cgroup event is attach to */
708         int                             cgrp_defer_enabled;
709 #endif
710 
711         struct list_head                sb_list;
712 #endif /* CONFIG_PERF_EVENTS */
713 };
714 
715 /**
716  * struct perf_event_context - event context structure
717  *
718  * Used as a container for task events and CPU events as well:
719  */
720 struct perf_event_context {
721         struct pmu                      *pmu;
722         /*
723          * Protect the states of the events in the list,
724          * nr_active, and the list:
725          */
726         raw_spinlock_t                  lock;
727         /*
728          * Protect the list of events.  Locking either mutex or lock
729          * is sufficient to ensure the list doesn't change; to change
730          * the list you need to lock both the mutex and the spinlock.
731          */
732         struct mutex                    mutex;
733 
734         struct list_head                active_ctx_list;
735         struct list_head                pinned_groups;
736         struct list_head                flexible_groups;
737         struct list_head                event_list;
738         int                             nr_events;
739         int                             nr_active;
740         int                             is_active;
741         int                             nr_stat;
742         int                             nr_freq;
743         int                             rotate_disable;
744         atomic_t                        refcount;
745         struct task_struct              *task;
746 
747         /*
748          * Context clock, runs when context enabled.
749          */
750         u64                             time;
751         u64                             timestamp;
752 
753         /*
754          * These fields let us detect when two contexts have both
755          * been cloned (inherited) from a common ancestor.
756          */
757         struct perf_event_context       *parent_ctx;
758         u64                             parent_gen;
759         u64                             generation;
760         int                             pin_count;
761 #ifdef CONFIG_CGROUP_PERF
762         int                             nr_cgroups;      /* cgroup evts */
763 #endif
764         void                            *task_ctx_data; /* pmu specific data */
765         struct rcu_head                 rcu_head;
766 };
767 
768 /*
769  * Number of contexts where an event can trigger:
770  *      task, softirq, hardirq, nmi.
771  */
772 #define PERF_NR_CONTEXTS        4
773 
774 /**
775  * struct perf_event_cpu_context - per cpu event context structure
776  */
777 struct perf_cpu_context {
778         struct perf_event_context       ctx;
779         struct perf_event_context       *task_ctx;
780         int                             active_oncpu;
781         int                             exclusive;
782 
783         raw_spinlock_t                  hrtimer_lock;
784         struct hrtimer                  hrtimer;
785         ktime_t                         hrtimer_interval;
786         unsigned int                    hrtimer_active;
787 
788         struct pmu                      *unique_pmu;
789 #ifdef CONFIG_CGROUP_PERF
790         struct perf_cgroup              *cgrp;
791 #endif
792 
793         struct list_head                sched_cb_entry;
794         int                             sched_cb_usage;
795 };
796 
797 struct perf_output_handle {
798         struct perf_event               *event;
799         struct ring_buffer              *rb;
800         unsigned long                   wakeup;
801         unsigned long                   size;
802         union {
803                 void                    *addr;
804                 unsigned long           head;
805         };
806         int                             page;
807 };
808 
809 struct bpf_perf_event_data_kern {
810         struct pt_regs *regs;
811         struct perf_sample_data *data;
812 };
813 
814 #ifdef CONFIG_CGROUP_PERF
815 
816 /*
817  * perf_cgroup_info keeps track of time_enabled for a cgroup.
818  * This is a per-cpu dynamically allocated data structure.
819  */
820 struct perf_cgroup_info {
821         u64                             time;
822         u64                             timestamp;
823 };
824 
825 struct perf_cgroup {
826         struct cgroup_subsys_state      css;
827         struct perf_cgroup_info __percpu *info;
828 };
829 
830 /*
831  * Must ensure cgroup is pinned (css_get) before calling
832  * this function. In other words, we cannot call this function
833  * if there is no cgroup event for the current CPU context.
834  */
835 static inline struct perf_cgroup *
836 perf_cgroup_from_task(struct task_struct *task, struct perf_event_context *ctx)
837 {
838         return container_of(task_css_check(task, perf_event_cgrp_id,
839                                            ctx ? lockdep_is_held(&ctx->lock)
840                                                : true),
841                             struct perf_cgroup, css);
842 }
843 #endif /* CONFIG_CGROUP_PERF */
844 
845 #ifdef CONFIG_PERF_EVENTS
846 
847 extern void *perf_aux_output_begin(struct perf_output_handle *handle,
848                                    struct perf_event *event);
849 extern void perf_aux_output_end(struct perf_output_handle *handle,
850                                 unsigned long size, bool truncated);
851 extern int perf_aux_output_skip(struct perf_output_handle *handle,
852                                 unsigned long size);
853 extern void *perf_get_aux(struct perf_output_handle *handle);
854 
855 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
856 extern void perf_pmu_unregister(struct pmu *pmu);
857 
858 extern int perf_num_counters(void);
859 extern const char *perf_pmu_name(void);
860 extern void __perf_event_task_sched_in(struct task_struct *prev,
861                                        struct task_struct *task);
862 extern void __perf_event_task_sched_out(struct task_struct *prev,
863                                         struct task_struct *next);
864 extern int perf_event_init_task(struct task_struct *child);
865 extern void perf_event_exit_task(struct task_struct *child);
866 extern void perf_event_free_task(struct task_struct *task);
867 extern void perf_event_delayed_put(struct task_struct *task);
868 extern struct file *perf_event_get(unsigned int fd);
869 extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event);
870 extern void perf_event_print_debug(void);
871 extern void perf_pmu_disable(struct pmu *pmu);
872 extern void perf_pmu_enable(struct pmu *pmu);
873 extern void perf_sched_cb_dec(struct pmu *pmu);
874 extern void perf_sched_cb_inc(struct pmu *pmu);
875 extern int perf_event_task_disable(void);
876 extern int perf_event_task_enable(void);
877 extern int perf_event_refresh(struct perf_event *event, int refresh);
878 extern void perf_event_update_userpage(struct perf_event *event);
879 extern int perf_event_release_kernel(struct perf_event *event);
880 extern struct perf_event *
881 perf_event_create_kernel_counter(struct perf_event_attr *attr,
882                                 int cpu,
883                                 struct task_struct *task,
884                                 perf_overflow_handler_t callback,
885                                 void *context);
886 extern void perf_pmu_migrate_context(struct pmu *pmu,
887                                 int src_cpu, int dst_cpu);
888 extern u64 perf_event_read_local(struct perf_event *event);
889 extern u64 perf_event_read_value(struct perf_event *event,
890                                  u64 *enabled, u64 *running);
891 
892 
893 struct perf_sample_data {
894         /*
895          * Fields set by perf_sample_data_init(), group so as to
896          * minimize the cachelines touched.
897          */
898         u64                             addr;
899         struct perf_raw_record          *raw;
900         struct perf_branch_stack        *br_stack;
901         u64                             period;
902         u64                             weight;
903         u64                             txn;
904         union  perf_mem_data_src        data_src;
905 
906         /*
907          * The other fields, optionally {set,used} by
908          * perf_{prepare,output}_sample().
909          */
910         u64                             type;
911         u64                             ip;
912         struct {
913                 u32     pid;
914                 u32     tid;
915         }                               tid_entry;
916         u64                             time;
917         u64                             id;
918         u64                             stream_id;
919         struct {
920                 u32     cpu;
921                 u32     reserved;
922         }                               cpu_entry;
923         struct perf_callchain_entry     *callchain;
924 
925         /*
926          * regs_user may point to task_pt_regs or to regs_user_copy, depending
927          * on arch details.
928          */
929         struct perf_regs                regs_user;
930         struct pt_regs                  regs_user_copy;
931 
932         struct perf_regs                regs_intr;
933         u64                             stack_user_size;
934 } ____cacheline_aligned;
935 
936 /* default value for data source */
937 #define PERF_MEM_NA (PERF_MEM_S(OP, NA)   |\
938                     PERF_MEM_S(LVL, NA)   |\
939                     PERF_MEM_S(SNOOP, NA) |\
940                     PERF_MEM_S(LOCK, NA)  |\
941                     PERF_MEM_S(TLB, NA))
942 
943 static inline void perf_sample_data_init(struct perf_sample_data *data,
944                                          u64 addr, u64 period)
945 {
946         /* remaining struct members initialized in perf_prepare_sample() */
947         data->addr = addr;
948         data->raw  = NULL;
949         data->br_stack = NULL;
950         data->period = period;
951         data->weight = 0;
952         data->data_src.val = PERF_MEM_NA;
953         data->txn = 0;
954 }
955 
956 extern void perf_output_sample(struct perf_output_handle *handle,
957                                struct perf_event_header *header,
958                                struct perf_sample_data *data,
959                                struct perf_event *event);
960 extern void perf_prepare_sample(struct perf_event_header *header,
961                                 struct perf_sample_data *data,
962                                 struct perf_event *event,
963                                 struct pt_regs *regs);
964 
965 extern int perf_event_overflow(struct perf_event *event,
966                                  struct perf_sample_data *data,
967                                  struct pt_regs *regs);
968 
969 extern void perf_event_output_forward(struct perf_event *event,
970                                      struct perf_sample_data *data,
971                                      struct pt_regs *regs);
972 extern void perf_event_output_backward(struct perf_event *event,
973                                        struct perf_sample_data *data,
974                                        struct pt_regs *regs);
975 extern void perf_event_output(struct perf_event *event,
976                               struct perf_sample_data *data,
977                               struct pt_regs *regs);
978 
979 static inline bool
980 is_default_overflow_handler(struct perf_event *event)
981 {
982         if (likely(event->overflow_handler == perf_event_output_forward))
983                 return true;
984         if (unlikely(event->overflow_handler == perf_event_output_backward))
985                 return true;
986         return false;
987 }
988 
989 extern void
990 perf_event_header__init_id(struct perf_event_header *header,
991                            struct perf_sample_data *data,
992                            struct perf_event *event);
993 extern void
994 perf_event__output_id_sample(struct perf_event *event,
995                              struct perf_output_handle *handle,
996                              struct perf_sample_data *sample);
997 
998 extern void
999 perf_log_lost_samples(struct perf_event *event, u64 lost);
1000 
1001 static inline bool is_sampling_event(struct perf_event *event)
1002 {
1003         return event->attr.sample_period != 0;
1004 }
1005 
1006 /*
1007  * Return 1 for a software event, 0 for a hardware event
1008  */
1009 static inline int is_software_event(struct perf_event *event)
1010 {
1011         return event->event_caps & PERF_EV_CAP_SOFTWARE;
1012 }
1013 
1014 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
1015 
1016 extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64);
1017 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
1018 
1019 #ifndef perf_arch_fetch_caller_regs
1020 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
1021 #endif
1022 
1023 /*
1024  * Take a snapshot of the regs. Skip ip and frame pointer to
1025  * the nth caller. We only need a few of the regs:
1026  * - ip for PERF_SAMPLE_IP
1027  * - cs for user_mode() tests
1028  * - bp for callchains
1029  * - eflags, for future purposes, just in case
1030  */
1031 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
1032 {
1033         perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
1034 }
1035 
1036 static __always_inline void
1037 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
1038 {
1039         if (static_key_false(&perf_swevent_enabled[event_id]))
1040                 __perf_sw_event(event_id, nr, regs, addr);
1041 }
1042 
1043 DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]);
1044 
1045 /*
1046  * 'Special' version for the scheduler, it hard assumes no recursion,
1047  * which is guaranteed by us not actually scheduling inside other swevents
1048  * because those disable preemption.
1049  */
1050 static __always_inline void
1051 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)
1052 {
1053         if (static_key_false(&perf_swevent_enabled[event_id])) {
1054                 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
1055 
1056                 perf_fetch_caller_regs(regs);
1057                 ___perf_sw_event(event_id, nr, regs, addr);
1058         }
1059 }
1060 
1061 extern struct static_key_false perf_sched_events;
1062 
1063 static __always_inline bool
1064 perf_sw_migrate_enabled(void)
1065 {
1066         if (static_key_false(&perf_swevent_enabled[PERF_COUNT_SW_CPU_MIGRATIONS]))
1067                 return true;
1068         return false;
1069 }
1070 
1071 static inline void perf_event_task_migrate(struct task_struct *task)
1072 {
1073         if (perf_sw_migrate_enabled())
1074                 task->sched_migrated = 1;
1075 }
1076 
1077 static inline void perf_event_task_sched_in(struct task_struct *prev,
1078                                             struct task_struct *task)
1079 {
1080         if (static_branch_unlikely(&perf_sched_events))
1081                 __perf_event_task_sched_in(prev, task);
1082 
1083         if (perf_sw_migrate_enabled() && task->sched_migrated) {
1084                 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
1085 
1086                 perf_fetch_caller_regs(regs);
1087                 ___perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, regs, 0);
1088                 task->sched_migrated = 0;
1089         }
1090 }
1091 
1092 static inline void perf_event_task_sched_out(struct task_struct *prev,
1093                                              struct task_struct *next)
1094 {
1095         perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);
1096 
1097         if (static_branch_unlikely(&perf_sched_events))
1098                 __perf_event_task_sched_out(prev, next);
1099 }
1100 
1101 static inline u64 __perf_event_count(struct perf_event *event)
1102 {
1103         return local64_read(&event->count) + atomic64_read(&event->child_count);
1104 }
1105 
1106 extern void perf_event_mmap(struct vm_area_struct *vma);
1107 extern struct perf_guest_info_callbacks *perf_guest_cbs;
1108 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1109 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1110 
1111 extern void perf_event_exec(void);
1112 extern void perf_event_comm(struct task_struct *tsk, bool exec);
1113 extern void perf_event_fork(struct task_struct *tsk);
1114 
1115 /* Callchains */
1116 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
1117 
1118 extern void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs);
1119 extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs);
1120 extern struct perf_callchain_entry *
1121 get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
1122                    u32 max_stack, bool crosstask, bool add_mark);
1123 extern int get_callchain_buffers(int max_stack);
1124 extern void put_callchain_buffers(void);
1125 
1126 extern int sysctl_perf_event_max_stack;
1127 extern int sysctl_perf_event_max_contexts_per_stack;
1128 
1129 static inline int perf_callchain_store_context(struct perf_callchain_entry_ctx *ctx, u64 ip)
1130 {
1131         if (ctx->contexts < sysctl_perf_event_max_contexts_per_stack) {
1132                 struct perf_callchain_entry *entry = ctx->entry;
1133                 entry->ip[entry->nr++] = ip;
1134                 ++ctx->contexts;
1135                 return 0;
1136         } else {
1137                 ctx->contexts_maxed = true;
1138                 return -1; /* no more room, stop walking the stack */
1139         }
1140 }
1141 
1142 static inline int perf_callchain_store(struct perf_callchain_entry_ctx *ctx, u64 ip)
1143 {
1144         if (ctx->nr < ctx->max_stack && !ctx->contexts_maxed) {
1145                 struct perf_callchain_entry *entry = ctx->entry;
1146                 entry->ip[entry->nr++] = ip;
1147                 ++ctx->nr;
1148                 return 0;
1149         } else {
1150                 return -1; /* no more room, stop walking the stack */
1151         }
1152 }
1153 
1154 extern int sysctl_perf_event_paranoid;
1155 extern int sysctl_perf_event_mlock;
1156 extern int sysctl_perf_event_sample_rate;
1157 extern int sysctl_perf_cpu_time_max_percent;
1158 
1159 extern void perf_sample_event_took(u64 sample_len_ns);
1160 
1161 extern int perf_proc_update_handler(struct ctl_table *table, int write,
1162                 void __user *buffer, size_t *lenp,
1163                 loff_t *ppos);
1164 extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
1165                 void __user *buffer, size_t *lenp,
1166                 loff_t *ppos);
1167 
1168 int perf_event_max_stack_handler(struct ctl_table *table, int write,
1169                                  void __user *buffer, size_t *lenp, loff_t *ppos);
1170 
1171 static inline bool perf_paranoid_tracepoint_raw(void)
1172 {
1173         return sysctl_perf_event_paranoid > -1;
1174 }
1175 
1176 static inline bool perf_paranoid_cpu(void)
1177 {
1178         return sysctl_perf_event_paranoid > 0;
1179 }
1180 
1181 static inline bool perf_paranoid_kernel(void)
1182 {
1183         return sysctl_perf_event_paranoid > 1;
1184 }
1185 
1186 extern void perf_event_init(void);
1187 extern void perf_tp_event(u16 event_type, u64 count, void *record,
1188                           int entry_size, struct pt_regs *regs,
1189                           struct hlist_head *head, int rctx,
1190                           struct task_struct *task);
1191 extern void perf_bp_event(struct perf_event *event, void *data);
1192 
1193 #ifndef perf_misc_flags
1194 # define perf_misc_flags(regs) \
1195                 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
1196 # define perf_instruction_pointer(regs) instruction_pointer(regs)
1197 #endif
1198 
1199 static inline bool has_branch_stack(struct perf_event *event)
1200 {
1201         return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
1202 }
1203 
1204 static inline bool needs_branch_stack(struct perf_event *event)
1205 {
1206         return event->attr.branch_sample_type != 0;
1207 }
1208 
1209 static inline bool has_aux(struct perf_event *event)
1210 {
1211         return event->pmu->setup_aux;
1212 }
1213 
1214 static inline bool is_write_backward(struct perf_event *event)
1215 {
1216         return !!event->attr.write_backward;
1217 }
1218 
1219 static inline bool has_addr_filter(struct perf_event *event)
1220 {
1221         return event->pmu->nr_addr_filters;
1222 }
1223 
1224 /*
1225  * An inherited event uses parent's filters
1226  */
1227 static inline struct perf_addr_filters_head *
1228 perf_event_addr_filters(struct perf_event *event)
1229 {
1230         struct perf_addr_filters_head *ifh = &event->addr_filters;
1231 
1232         if (event->parent)
1233                 ifh = &event->parent->addr_filters;
1234 
1235         return ifh;
1236 }
1237 
1238 extern void perf_event_addr_filters_sync(struct perf_event *event);
1239 
1240 extern int perf_output_begin(struct perf_output_handle *handle,
1241                              struct perf_event *event, unsigned int size);
1242 extern int perf_output_begin_forward(struct perf_output_handle *handle,
1243                                     struct perf_event *event,
1244                                     unsigned int size);
1245 extern int perf_output_begin_backward(struct perf_output_handle *handle,
1246                                       struct perf_event *event,
1247                                       unsigned int size);
1248 
1249 extern void perf_output_end(struct perf_output_handle *handle);
1250 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
1251                              const void *buf, unsigned int len);
1252 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
1253                                      unsigned int len);
1254 extern int perf_swevent_get_recursion_context(void);
1255 extern void perf_swevent_put_recursion_context(int rctx);
1256 extern u64 perf_swevent_set_period(struct perf_event *event);
1257 extern void perf_event_enable(struct perf_event *event);
1258 extern void perf_event_disable(struct perf_event *event);
1259 extern void perf_event_disable_local(struct perf_event *event);
1260 extern void perf_event_disable_inatomic(struct perf_event *event);
1261 extern void perf_event_task_tick(void);
1262 extern int perf_event_account_interrupt(struct perf_event *event);
1263 #else /* !CONFIG_PERF_EVENTS: */
1264 static inline void *
1265 perf_aux_output_begin(struct perf_output_handle *handle,
1266                       struct perf_event *event)                         { return NULL; }
1267 static inline void
1268 perf_aux_output_end(struct perf_output_handle *handle, unsigned long size,
1269                     bool truncated)                                     { }
1270 static inline int
1271 perf_aux_output_skip(struct perf_output_handle *handle,
1272                      unsigned long size)                                { return -EINVAL; }
1273 static inline void *
1274 perf_get_aux(struct perf_output_handle *handle)                         { return NULL; }
1275 static inline void
1276 perf_event_task_migrate(struct task_struct *task)                       { }
1277 static inline void
1278 perf_event_task_sched_in(struct task_struct *prev,
1279                          struct task_struct *task)                      { }
1280 static inline void
1281 perf_event_task_sched_out(struct task_struct *prev,
1282                           struct task_struct *next)                     { }
1283 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
1284 static inline void perf_event_exit_task(struct task_struct *child)      { }
1285 static inline void perf_event_free_task(struct task_struct *task)       { }
1286 static inline void perf_event_delayed_put(struct task_struct *task)     { }
1287 static inline struct file *perf_event_get(unsigned int fd)      { return ERR_PTR(-EINVAL); }
1288 static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event)
1289 {
1290         return ERR_PTR(-EINVAL);
1291 }
1292 static inline u64 perf_event_read_local(struct perf_event *event)       { return -EINVAL; }
1293 static inline void perf_event_print_debug(void)                         { }
1294 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
1295 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
1296 static inline int perf_event_refresh(struct perf_event *event, int refresh)
1297 {
1298         return -EINVAL;
1299 }
1300 
1301 static inline void
1302 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)     { }
1303 static inline void
1304 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)                     { }
1305 static inline void
1306 perf_bp_event(struct perf_event *event, void *data)                     { }
1307 
1308 static inline int perf_register_guest_info_callbacks
1309 (struct perf_guest_info_callbacks *callbacks)                           { return 0; }
1310 static inline int perf_unregister_guest_info_callbacks
1311 (struct perf_guest_info_callbacks *callbacks)                           { return 0; }
1312 
1313 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
1314 static inline void perf_event_exec(void)                                { }
1315 static inline void perf_event_comm(struct task_struct *tsk, bool exec)  { }
1316 static inline void perf_event_fork(struct task_struct *tsk)             { }
1317 static inline void perf_event_init(void)                                { }
1318 static inline int  perf_swevent_get_recursion_context(void)             { return -1; }
1319 static inline void perf_swevent_put_recursion_context(int rctx)         { }
1320 static inline u64 perf_swevent_set_period(struct perf_event *event)     { return 0; }
1321 static inline void perf_event_enable(struct perf_event *event)          { }
1322 static inline void perf_event_disable(struct perf_event *event)         { }
1323 static inline int __perf_event_disable(void *info)                      { return -1; }
1324 static inline void perf_event_task_tick(void)                           { }
1325 static inline int perf_event_release_kernel(struct perf_event *event)   { return 0; }
1326 #endif
1327 
1328 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
1329 extern void perf_restore_debug_store(void);
1330 #else
1331 static inline void perf_restore_debug_store(void)                       { }
1332 #endif
1333 
1334 static __always_inline bool perf_raw_frag_last(const struct perf_raw_frag *frag)
1335 {
1336         return frag->pad < sizeof(u64);
1337 }
1338 
1339 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
1340 
1341 struct perf_pmu_events_attr {
1342         struct device_attribute attr;
1343         u64 id;
1344         const char *event_str;
1345 };
1346 
1347 struct perf_pmu_events_ht_attr {
1348         struct device_attribute                 attr;
1349         u64                                     id;
1350         const char                              *event_str_ht;
1351         const char                              *event_str_noht;
1352 };
1353 
1354 ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
1355                               char *page);
1356 
1357 #define PMU_EVENT_ATTR(_name, _var, _id, _show)                         \
1358 static struct perf_pmu_events_attr _var = {                             \
1359         .attr = __ATTR(_name, 0444, _show, NULL),                       \
1360         .id   =  _id,                                                   \
1361 };
1362 
1363 #define PMU_EVENT_ATTR_STRING(_name, _var, _str)                            \
1364 static struct perf_pmu_events_attr _var = {                                 \
1365         .attr           = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \
1366         .id             = 0,                                                \
1367         .event_str      = _str,                                             \
1368 };
1369 
1370 #define PMU_FORMAT_ATTR(_name, _format)                                 \
1371 static ssize_t                                                          \
1372 _name##_show(struct device *dev,                                        \
1373                                struct device_attribute *attr,           \
1374                                char *page)                              \
1375 {                                                                       \
1376         BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);                     \
1377         return sprintf(page, _format "\n");                             \
1378 }                                                                       \
1379                                                                         \
1380 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
1381 
1382 /* Performance counter hotplug functions */
1383 #ifdef CONFIG_PERF_EVENTS
1384 int perf_event_init_cpu(unsigned int cpu);
1385 int perf_event_exit_cpu(unsigned int cpu);
1386 #else
1387 #define perf_event_init_cpu     NULL
1388 #define perf_event_exit_cpu     NULL
1389 #endif
1390 
1391 #endif /* _LINUX_PERF_EVENT_H */
1392 

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