include/linux/perf_event.h

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