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   1 /*
   2  * Performance events:
   3  *
   4  *    Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
   5  *    Copyright (C) 2008-2009, Red Hat, Inc., Ingo Molnar
   6  *    Copyright (C) 2008-2009, 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 <linux/types.h>
  18 #include <linux/ioctl.h>
  19 #include <asm/byteorder.h>
  20
  21 /*
  22  * User-space ABI bits:
  23  */
  24
  25 /*
  26  * attr.type
  27  */
  28 enum perf_type_id {
  29         PERF_TYPE_HARDWARE                      = 0,
  30         PERF_TYPE_SOFTWARE                      = 1,
  31         PERF_TYPE_TRACEPOINT                    = 2,
  32         PERF_TYPE_HW_CACHE                      = 3,
  33         PERF_TYPE_RAW                           = 4,
  34
  35         PERF_TYPE_MAX,                          /* non-ABI */
  36 };
  37
  38 /*
  39  * Generalized performance event event_id types, used by the
  40  * attr.event_id parameter of the sys_perf_event_open()
  41  * syscall:
  42  */
  43 enum perf_hw_id {
  44         /*
  45          * Common hardware events, generalized by the kernel:
  46          */
  47         PERF_COUNT_HW_CPU_CYCLES                = 0,
  48         PERF_COUNT_HW_INSTRUCTIONS              = 1,
  49         PERF_COUNT_HW_CACHE_REFERENCES          = 2,
  50         PERF_COUNT_HW_CACHE_MISSES              = 3,
  51         PERF_COUNT_HW_BRANCH_INSTRUCTIONS       = 4,
  52         PERF_COUNT_HW_BRANCH_MISSES             = 5,
  53         PERF_COUNT_HW_BUS_CYCLES                = 6,
  54
  55         PERF_COUNT_HW_MAX,                      /* non-ABI */
  56 };
  57
  58 /*
  59  * Generalized hardware cache events:
  60  *
  61  *       { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
  62  *       { read, write, prefetch } x
  63  *       { accesses, misses }
  64  */
  65 enum perf_hw_cache_id {
  66         PERF_COUNT_HW_CACHE_L1D                 = 0,
  67         PERF_COUNT_HW_CACHE_L1I                 = 1,
  68         PERF_COUNT_HW_CACHE_LL                  = 2,
  69         PERF_COUNT_HW_CACHE_DTLB                = 3,
  70         PERF_COUNT_HW_CACHE_ITLB                = 4,
  71         PERF_COUNT_HW_CACHE_BPU                 = 5,
  72
  73         PERF_COUNT_HW_CACHE_MAX,                /* non-ABI */
  74 };
  75
  76 enum perf_hw_cache_op_id {
  77         PERF_COUNT_HW_CACHE_OP_READ             = 0,
  78         PERF_COUNT_HW_CACHE_OP_WRITE            = 1,
  79         PERF_COUNT_HW_CACHE_OP_PREFETCH         = 2,
  80
  81         PERF_COUNT_HW_CACHE_OP_MAX,             /* non-ABI */
  82 };
  83
  84 enum perf_hw_cache_op_result_id {
  85         PERF_COUNT_HW_CACHE_RESULT_ACCESS       = 0,
  86         PERF_COUNT_HW_CACHE_RESULT_MISS         = 1,
  87
  88         PERF_COUNT_HW_CACHE_RESULT_MAX,         /* non-ABI */
  89 };
  90
  91 /*
  92  * Special "software" events provided by the kernel, even if the hardware
  93  * does not support performance events. These events measure various
  94  * physical and sw events of the kernel (and allow the profiling of them as
  95  * well):
  96  */
  97 enum perf_sw_ids {
  98         PERF_COUNT_SW_CPU_CLOCK                 = 0,
  99         PERF_COUNT_SW_TASK_CLOCK                = 1,
 100         PERF_COUNT_SW_PAGE_FAULTS               = 2,
 101         PERF_COUNT_SW_CONTEXT_SWITCHES          = 3,
 102         PERF_COUNT_SW_CPU_MIGRATIONS            = 4,
 103         PERF_COUNT_SW_PAGE_FAULTS_MIN           = 5,
 104         PERF_COUNT_SW_PAGE_FAULTS_MAJ           = 6,
 105         PERF_COUNT_SW_ALIGNMENT_FAULTS          = 7,
 106         PERF_COUNT_SW_EMULATION_FAULTS          = 8,
 107
 108         PERF_COUNT_SW_MAX,                      /* non-ABI */
 109 };
 110
 111 /*
 112  * Bits that can be set in attr.sample_type to request information
 113  * in the overflow packets.
 114  */
 115 enum perf_event_sample_format {
 116         PERF_SAMPLE_IP                          = 1U << 0,
 117         PERF_SAMPLE_TID                         = 1U << 1,
 118         PERF_SAMPLE_TIME                        = 1U << 2,
 119         PERF_SAMPLE_ADDR                        = 1U << 3,
 120         PERF_SAMPLE_READ                        = 1U << 4,
 121         PERF_SAMPLE_CALLCHAIN                   = 1U << 5,
 122         PERF_SAMPLE_ID                          = 1U << 6,
 123         PERF_SAMPLE_CPU                         = 1U << 7,
 124         PERF_SAMPLE_PERIOD                      = 1U << 8,
 125         PERF_SAMPLE_STREAM_ID                   = 1U << 9,
 126         PERF_SAMPLE_RAW                         = 1U << 10,
 127
 128         PERF_SAMPLE_MAX = 1U << 11,             /* non-ABI */
 129 };
 130
 131 /*
 132  * The format of the data returned by read() on a perf event fd,
 133  * as specified by attr.read_format:
 134  *
 135  * struct read_format {
 136  *      { u64           value;
 137  *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
 138  *        { u64         time_running; } && PERF_FORMAT_RUNNING
 139  *        { u64         id;           } && PERF_FORMAT_ID
 140  *      } && !PERF_FORMAT_GROUP
 141  *
 142  *      { u64           nr;
 143  *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
 144  *        { u64         time_running; } && PERF_FORMAT_RUNNING
 145  *        { u64         value;
 146  *          { u64       id;           } && PERF_FORMAT_ID
 147  *        }             cntr[nr];
 148  *      } && PERF_FORMAT_GROUP
 149  * };
 150  */
 151 enum perf_event_read_format {
 152         PERF_FORMAT_TOTAL_TIME_ENABLED          = 1U << 0,
 153         PERF_FORMAT_TOTAL_TIME_RUNNING          = 1U << 1,
 154         PERF_FORMAT_ID                          = 1U << 2,
 155         PERF_FORMAT_GROUP                       = 1U << 3,
 156
 157         PERF_FORMAT_MAX = 1U << 4,              /* non-ABI */
 158 };
 159
 160 #define PERF_ATTR_SIZE_VER0     64      /* sizeof first published struct */
 161
 162 /*
 163  * Hardware event_id to monitor via a performance monitoring event:
 164  */
 165 struct perf_event_attr {
 166
 167         /*
 168          * Major type: hardware/software/tracepoint/etc.
 169          */
 170         __u32                   type;
 171
 172         /*
 173          * Size of the attr structure, for fwd/bwd compat.
 174          */
 175         __u32                   size;
 176
 177         /*
 178          * Type specific configuration information.
 179          */
 180         __u64                   config;
 181
 182         union {
 183                 __u64           sample_period;
 184                 __u64           sample_freq;
 185         };
 186
 187         __u64                   sample_type;
 188         __u64                   read_format;
 189
 190         __u64                   disabled       :  1, /* off by default        */
 191                                 inherit        :  1, /* children inherit it   */
 192                                 pinned         :  1, /* must always be on PMU */
 193                                 exclusive      :  1, /* only group on PMU     */
 194                                 exclude_user   :  1, /* don't count user      */
 195                                 exclude_kernel :  1, /* ditto kernel          */
 196                                 exclude_hv     :  1, /* ditto hypervisor      */
 197                                 exclude_idle   :  1, /* don't count when idle */
 198                                 mmap           :  1, /* include mmap data     */
 199                                 comm           :  1, /* include comm data     */
 200                                 freq           :  1, /* use freq, not period  */
 201                                 inherit_stat   :  1, /* per task counts       */
 202                                 enable_on_exec :  1, /* next exec enables     */
 203                                 task           :  1, /* trace fork/exit       */
 204                                 watermark      :  1, /* wakeup_watermark      */
 205
 206                                 __reserved_1   : 49;
 207
 208         union {
 209                 __u32           wakeup_events;    /* wakeup every n events */
 210                 __u32           wakeup_watermark; /* bytes before wakeup   */
 211         };
 212         __u32                   __reserved_2;
 213
 214         __u64                   __reserved_3;
 215 };
 216
 217 /*
 218  * Ioctls that can be done on a perf event fd:
 219  */
 220 #define PERF_EVENT_IOC_ENABLE           _IO ('$', 0)
 221 #define PERF_EVENT_IOC_DISABLE          _IO ('$', 1)
 222 #define PERF_EVENT_IOC_REFRESH          _IO ('$', 2)
 223 #define PERF_EVENT_IOC_RESET            _IO ('$', 3)
 224 #define PERF_EVENT_IOC_PERIOD           _IOW('$', 4, __u64)
 225 #define PERF_EVENT_IOC_SET_OUTPUT       _IO ('$', 5)
 226 #define PERF_EVENT_IOC_SET_FILTER       _IOW('$', 6, char *)
 227
 228 enum perf_event_ioc_flags {
 229         PERF_IOC_FLAG_GROUP             = 1U << 0,
 230 };
 231
 232 /*
 233  * Structure of the page that can be mapped via mmap
 234  */
 235 struct perf_event_mmap_page {
 236         __u32   version;                /* version number of this structure */
 237         __u32   compat_version;         /* lowest version this is compat with */
 238
 239         /*
 240          * Bits needed to read the hw events in user-space.
 241          *
 242          *   u32 seq;
 243          *   s64 count;
 244          *
 245          *   do {
 246          *     seq = pc->lock;
 247          *
 248          *     barrier()
 249          *     if (pc->index) {
 250          *       count = pmc_read(pc->index - 1);
 251          *       count += pc->offset;
 252          *     } else
 253          *       goto regular_read;
 254          *
 255          *     barrier();
 256          *   } while (pc->lock != seq);
 257          *
 258          * NOTE: for obvious reason this only works on self-monitoring
 259          *       processes.
 260          */
 261         __u32   lock;                   /* seqlock for synchronization */
 262         __u32   index;                  /* hardware event identifier */
 263         __s64   offset;                 /* add to hardware event value */
 264         __u64   time_enabled;           /* time event active */
 265         __u64   time_running;           /* time event on cpu */
 266
 267                 /*
 268                  * Hole for extension of the self monitor capabilities
 269                  */
 270
 271         __u64   __reserved[123];        /* align to 1k */
 272
 273         /*
 274          * Control data for the mmap() data buffer.
 275          *
 276          * User-space reading the @data_head value should issue an rmb(), on
 277          * SMP capable platforms, after reading this value -- see
 278          * perf_event_wakeup().
 279          *
 280          * When the mapping is PROT_WRITE the @data_tail value should be
 281          * written by userspace to reflect the last read data. In this case
 282          * the kernel will not over-write unread data.
 283          */
 284         __u64   data_head;              /* head in the data section */
 285         __u64   data_tail;              /* user-space written tail */
 286 };
 287
 288 #define PERF_RECORD_MISC_CPUMODE_MASK           (3 << 0)
 289 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN                (0 << 0)
 290 #define PERF_RECORD_MISC_KERNEL                 (1 << 0)
 291 #define PERF_RECORD_MISC_USER                   (2 << 0)
 292 #define PERF_RECORD_MISC_HYPERVISOR             (3 << 0)
 293
 294 struct perf_event_header {
 295         __u32   type;
 296         __u16   misc;
 297         __u16   size;
 298 };
 299
 300 enum perf_event_type {
 301
 302         /*
 303          * The MMAP events record the PROT_EXEC mappings so that we can
 304          * correlate userspace IPs to code. They have the following structure:
 305          *
 306          * struct {
 307          *      struct perf_event_header        header;
 308          *
 309          *      u32                             pid, tid;
 310          *      u64                             addr;
 311          *      u64                             len;
 312          *      u64                             pgoff;
 313          *      char                            filename[];
 314          * };
 315          */
 316         PERF_RECORD_MMAP                        = 1,
 317
 318         /*
 319          * struct {
 320          *      struct perf_event_header        header;
 321          *      u64                             id;
 322          *      u64                             lost;
 323          * };
 324          */
 325         PERF_RECORD_LOST                        = 2,
 326
 327         /*
 328          * struct {
 329          *      struct perf_event_header        header;
 330          *
 331          *      u32                             pid, tid;
 332          *      char                            comm[];
 333          * };
 334          */
 335         PERF_RECORD_COMM                        = 3,
 336
 337         /*
 338          * struct {
 339          *      struct perf_event_header        header;
 340          *      u32                             pid, ppid;
 341          *      u32                             tid, ptid;
 342          *      u64                             time;
 343          * };
 344          */
 345         PERF_RECORD_EXIT                        = 4,
 346
 347         /*
 348          * struct {
 349          *      struct perf_event_header        header;
 350          *      u64                             time;
 351          *      u64                             id;
 352          *      u64                             stream_id;
 353          * };
 354          */
 355         PERF_RECORD_THROTTLE            = 5,
 356         PERF_RECORD_UNTHROTTLE          = 6,
 357
 358         /*
 359          * struct {
 360          *      struct perf_event_header        header;
 361          *      u32                             pid, ppid;
 362          *      u32                             tid, ptid;
 363          *      u64                             time;
 364          * };
 365          */
 366         PERF_RECORD_FORK                        = 7,
 367
 368         /*
 369          * struct {
 370          *      struct perf_event_header        header;
 371          *      u32                             pid, tid;
 372          *
 373          *      struct read_format              values;
 374          * };
 375          */
 376         PERF_RECORD_READ                        = 8,
 377
 378         /*
 379          * struct {
 380          *      struct perf_event_header        header;
 381          *
 382          *      { u64                   ip;       } && PERF_SAMPLE_IP
 383          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
 384          *      { u64                   time;     } && PERF_SAMPLE_TIME
 385          *      { u64                   addr;     } && PERF_SAMPLE_ADDR
 386          *      { u64                   id;       } && PERF_SAMPLE_ID
 387          *      { u64                   stream_id;} && PERF_SAMPLE_STREAM_ID
 388          *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
 389          *      { u64                   period;   } && PERF_SAMPLE_PERIOD
 390          *
 391          *      { struct read_format    values;   } && PERF_SAMPLE_READ
 392          *
 393          *      { u64                   nr,
 394          *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
 395          *
 396          *      #
 397          *      # The RAW record below is opaque data wrt the ABI
 398          *      #
 399          *      # That is, the ABI doesn't make any promises wrt to
 400          *      # the stability of its content, it may vary depending
 401          *      # on event, hardware, kernel version and phase of
 402          *      # the moon.
 403          *      #
 404          *      # In other words, PERF_SAMPLE_RAW contents are not an ABI.
 405          *      #
 406          *
 407          *      { u32                   size;
 408          *        char                  data[size];}&& PERF_SAMPLE_RAW
 409          * };
 410          */
 411         PERF_RECORD_SAMPLE              = 9,
 412
 413         PERF_RECORD_MAX,                        /* non-ABI */
 414 };
 415
 416 enum perf_callchain_context {
 417         PERF_CONTEXT_HV                 = (__u64)-32,
 418         PERF_CONTEXT_KERNEL             = (__u64)-128,
 419         PERF_CONTEXT_USER               = (__u64)-512,
 420
 421         PERF_CONTEXT_GUEST              = (__u64)-2048,
 422         PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
 423         PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
 424
 425         PERF_CONTEXT_MAX                = (__u64)-4095,
 426 };
 427
 428 #define PERF_FLAG_FD_NO_GROUP   (1U << 0)
 429 #define PERF_FLAG_FD_OUTPUT     (1U << 1)
 430
 431 #ifdef __KERNEL__
 432 /*
 433  * Kernel-internal data types and definitions:
 434  */
 435
 436 #ifdef CONFIG_PERF_EVENTS
 437 # include <asm/perf_event.h>
 438 #endif
 439
 440 #include <linux/list.h>
 441 #include <linux/mutex.h>
 442 #include <linux/rculist.h>
 443 #include <linux/rcupdate.h>
 444 #include <linux/spinlock.h>
 445 #include <linux/hrtimer.h>
 446 #include <linux/fs.h>
 447 #include <linux/pid_namespace.h>
 448 #include <linux/workqueue.h>
 449 #include <asm/atomic.h>
 450
 451 #define PERF_MAX_STACK_DEPTH            255
 452
 453 struct perf_callchain_entry {
 454         __u64                           nr;
 455         __u64                           ip[PERF_MAX_STACK_DEPTH];
 456 };
 457
 458 struct perf_raw_record {
 459         u32                             size;
 460         void                            *data;
 461 };
 462
 463 struct task_struct;
 464
 465 /**
 466  * struct hw_perf_event - performance event hardware details:
 467  */
 468 struct hw_perf_event {
 469 #ifdef CONFIG_PERF_EVENTS
 470         union {
 471                 struct { /* hardware */
 472                         u64             config;
 473                         unsigned long   config_base;
 474                         unsigned long   event_base;
 475                         int             idx;
 476                 };
 477                 struct { /* software */
 478                         s64             remaining;
 479                         struct hrtimer  hrtimer;
 480                 };
 481         };
 482         atomic64_t                      prev_count;
 483         u64                             sample_period;
 484         u64                             last_period;
 485         atomic64_t                      period_left;
 486         u64                             interrupts;
 487
 488         u64                             freq_count;
 489         u64                             freq_interrupts;
 490         u64                             freq_stamp;
 491 #endif
 492 };
 493
 494 struct perf_event;
 495
 496 /**
 497  * struct pmu - generic performance monitoring unit
 498  */
 499 struct pmu {
 500         int (*enable)                   (struct perf_event *event);
 501         void (*disable)                 (struct perf_event *event);
 502         void (*read)                    (struct perf_event *event);
 503         void (*unthrottle)              (struct perf_event *event);
 504 };
 505
 506 /**
 507  * enum perf_event_active_state - the states of a event
 508  */
 509 enum perf_event_active_state {
 510         PERF_EVENT_STATE_ERROR          = -2,
 511         PERF_EVENT_STATE_OFF            = -1,
 512         PERF_EVENT_STATE_INACTIVE       =  0,
 513         PERF_EVENT_STATE_ACTIVE         =  1,
 514 };
 515
 516 struct file;
 517
 518 struct perf_mmap_data {
 519         struct rcu_head                 rcu_head;
 520 #ifdef CONFIG_PERF_USE_VMALLOC
 521         struct work_struct              work;
 522 #endif
 523         int                             data_order;
 524         int                             nr_pages;       /* nr of data pages  */
 525         int                             writable;       /* are we writable   */
 526         int                             nr_locked;      /* nr pages mlocked  */
 527
 528         atomic_t                        poll;           /* POLL_ for wakeups */
 529         atomic_t                        events;         /* event_id limit       */
 530
 531         atomic_long_t                   head;           /* write position    */
 532         atomic_long_t                   done_head;      /* completed head    */
 533
 534         atomic_t                        lock;           /* concurrent writes */
 535         atomic_t                        wakeup;         /* needs a wakeup    */
 536         atomic_t                        lost;           /* nr records lost   */
 537
 538         long                            watermark;      /* wakeup watermark  */
 539
 540         struct perf_event_mmap_page     *user_page;
 541         void                            *data_pages[0];
 542 };
 543
 544 struct perf_pending_entry {
 545         struct perf_pending_entry *next;
 546         void (*func)(struct perf_pending_entry *);
 547 };
 548
 549 /**
 550  * struct perf_event - performance event kernel representation:
 551  */
 552 struct perf_event {
 553 #ifdef CONFIG_PERF_EVENTS
 554         struct list_head                group_entry;
 555         struct list_head                event_entry;
 556         struct list_head                sibling_list;
 557         int                             nr_siblings;
 558         struct perf_event               *group_leader;
 559         struct perf_event               *output;
 560         const struct pmu                *pmu;
 561
 562         enum perf_event_active_state    state;
 563         atomic64_t                      count;
 564
 565         /*
 566          * These are the total time in nanoseconds that the event
 567          * has been enabled (i.e. eligible to run, and the task has
 568          * been scheduled in, if this is a per-task event)
 569          * and running (scheduled onto the CPU), respectively.
 570          *
 571          * They are computed from tstamp_enabled, tstamp_running and
 572          * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
 573          */
 574         u64                             total_time_enabled;
 575         u64                             total_time_running;
 576
 577         /*
 578          * These are timestamps used for computing total_time_enabled
 579          * and total_time_running when the event is in INACTIVE or
 580          * ACTIVE state, measured in nanoseconds from an arbitrary point
 581          * in time.
 582          * tstamp_enabled: the notional time when the event was enabled
 583          * tstamp_running: the notional time when the event was scheduled on
 584          * tstamp_stopped: in INACTIVE state, the notional time when the
 585          *      event was scheduled off.
 586          */
 587         u64                             tstamp_enabled;
 588         u64                             tstamp_running;
 589         u64                             tstamp_stopped;
 590
 591         struct perf_event_attr  attr;
 592         struct hw_perf_event            hw;
 593
 594         struct perf_event_context       *ctx;
 595         struct file                     *filp;
 596
 597         /*
 598          * These accumulate total time (in nanoseconds) that children
 599          * events have been enabled and running, respectively.
 600          */
 601         atomic64_t                      child_total_time_enabled;
 602         atomic64_t                      child_total_time_running;
 603
 604         /*
 605          * Protect attach/detach and child_list:
 606          */
 607         struct mutex                    child_mutex;
 608         struct list_head                child_list;
 609         struct perf_event               *parent;
 610
 611         int                             oncpu;
 612         int                             cpu;
 613
 614         struct list_head                owner_entry;
 615         struct task_struct              *owner;
 616
 617         /* mmap bits */
 618         struct mutex                    mmap_mutex;
 619         atomic_t                        mmap_count;
 620         struct perf_mmap_data           *data;
 621
 622         /* poll related */
 623         wait_queue_head_t               waitq;
 624         struct fasync_struct            *fasync;
 625
 626         /* delayed work for NMIs and such */
 627         int                             pending_wakeup;
 628         int                             pending_kill;
 629         int                             pending_disable;
 630         struct perf_pending_entry       pending;
 631
 632         atomic_t                        event_limit;
 633
 634         void (*destroy)(struct perf_event *);
 635         struct rcu_head                 rcu_head;
 636
 637         struct pid_namespace            *ns;
 638         u64                             id;
 639
 640 #ifdef CONFIG_EVENT_PROFILE
 641         struct event_filter             *filter;
 642 #endif
 643
 644 #endif /* CONFIG_PERF_EVENTS */
 645 };
 646
 647 /**
 648  * struct perf_event_context - event context structure
 649  *
 650  * Used as a container for task events and CPU events as well:
 651  */
 652 struct perf_event_context {
 653         /*
 654          * Protect the states of the events in the list,
 655          * nr_active, and the list:
 656          */
 657         spinlock_t                      lock;
 658         /*
 659          * Protect the list of events.  Locking either mutex or lock
 660          * is sufficient to ensure the list doesn't change; to change
 661          * the list you need to lock both the mutex and the spinlock.
 662          */
 663         struct mutex                    mutex;
 664
 665         struct list_head                group_list;
 666         struct list_head                event_list;
 667         int                             nr_events;
 668         int                             nr_active;
 669         int                             is_active;
 670         int                             nr_stat;
 671         atomic_t                        refcount;
 672         struct task_struct              *task;
 673
 674         /*
 675          * Context clock, runs when context enabled.
 676          */
 677         u64                             time;
 678         u64                             timestamp;
 679
 680         /*
 681          * These fields let us detect when two contexts have both
 682          * been cloned (inherited) from a common ancestor.
 683          */
 684         struct perf_event_context       *parent_ctx;
 685         u64                             parent_gen;
 686         u64                             generation;
 687         int                             pin_count;
 688         struct rcu_head                 rcu_head;
 689 };
 690
 691 /**
 692  * struct perf_event_cpu_context - per cpu event context structure
 693  */
 694 struct perf_cpu_context {
 695         struct perf_event_context       ctx;
 696         struct perf_event_context       *task_ctx;
 697         int                             active_oncpu;
 698         int                             max_pertask;
 699         int                             exclusive;
 700
 701         /*
 702          * Recursion avoidance:
 703          *
 704          * task, softirq, irq, nmi context
 705          */
 706         int                             recursion[4];
 707 };
 708
 709 struct perf_output_handle {
 710         struct perf_event               *event;
 711         struct perf_mmap_data           *data;
 712         unsigned long                   head;
 713         unsigned long                   offset;
 714         int                             nmi;
 715         int                             sample;
 716         int                             locked;
 717 };
 718
 719 #ifdef CONFIG_PERF_EVENTS
 720
 721 /*
 722  * Set by architecture code:
 723  */
 724 extern int perf_max_events;
 725
 726 extern const struct pmu *hw_perf_event_init(struct perf_event *event);
 727
 728 extern void perf_event_task_sched_in(struct task_struct *task, int cpu);
 729 extern void perf_event_task_sched_out(struct task_struct *task,
 730                                         struct task_struct *next, int cpu);
 731 extern void perf_event_task_tick(struct task_struct *task, int cpu);
 732 extern int perf_event_init_task(struct task_struct *child);
 733 extern void perf_event_exit_task(struct task_struct *child);
 734 extern void perf_event_free_task(struct task_struct *task);
 735 extern void set_perf_event_pending(void);
 736 extern void perf_event_do_pending(void);
 737 extern void perf_event_print_debug(void);
 738 extern void __perf_disable(void);
 739 extern bool __perf_enable(void);
 740 extern void perf_disable(void);
 741 extern void perf_enable(void);
 742 extern int perf_event_task_disable(void);
 743 extern int perf_event_task_enable(void);
 744 extern int hw_perf_group_sched_in(struct perf_event *group_leader,
 745                struct perf_cpu_context *cpuctx,
 746                struct perf_event_context *ctx, int cpu);
 747 extern void perf_event_update_userpage(struct perf_event *event);
 748
 749 struct perf_sample_data {
 750         u64                             type;
 751
 752         u64                             ip;
 753         struct {
 754                 u32     pid;
 755                 u32     tid;
 756         }                               tid_entry;
 757         u64                             time;
 758         u64                             addr;
 759         u64                             id;
 760         u64                             stream_id;
 761         struct {
 762                 u32     cpu;
 763                 u32     reserved;
 764         }                               cpu_entry;
 765         u64                             period;
 766         struct perf_callchain_entry     *callchain;
 767         struct perf_raw_record          *raw;
 768 };
 769
 770 extern void perf_output_sample(struct perf_output_handle *handle,
 771                                struct perf_event_header *header,
 772                                struct perf_sample_data *data,
 773                                struct perf_event *event);
 774 extern void perf_prepare_sample(struct perf_event_header *header,
 775                                 struct perf_sample_data *data,
 776                                 struct perf_event *event,
 777                                 struct pt_regs *regs);
 778
 779 extern int perf_event_overflow(struct perf_event *event, int nmi,
 780                                  struct perf_sample_data *data,
 781                                  struct pt_regs *regs);
 782
 783 /*
 784  * Return 1 for a software event, 0 for a hardware event
 785  */
 786 static inline int is_software_event(struct perf_event *event)
 787 {
 788         return (event->attr.type != PERF_TYPE_RAW) &&
 789                 (event->attr.type != PERF_TYPE_HARDWARE) &&
 790                 (event->attr.type != PERF_TYPE_HW_CACHE);
 791 }
 792
 793 extern atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX];
 794
 795 extern void __perf_sw_event(u32, u64, int, struct pt_regs *, u64);
 796
 797 static inline void
 798 perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
 799 {
 800         if (atomic_read(&perf_swevent_enabled[event_id]))
 801                 __perf_sw_event(event_id, nr, nmi, regs, addr);
 802 }
 803
 804 extern void __perf_event_mmap(struct vm_area_struct *vma);
 805
 806 static inline void perf_event_mmap(struct vm_area_struct *vma)
 807 {
 808         if (vma->vm_flags & VM_EXEC)
 809                 __perf_event_mmap(vma);
 810 }
 811
 812 extern void perf_event_comm(struct task_struct *tsk);
 813 extern void perf_event_fork(struct task_struct *tsk);
 814
 815 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 816
 817 extern int sysctl_perf_event_paranoid;
 818 extern int sysctl_perf_event_mlock;
 819 extern int sysctl_perf_event_sample_rate;
 820
 821 extern void perf_event_init(void);
 822 extern void perf_tp_event(int event_id, u64 addr, u64 count,
 823                                  void *record, int entry_size);
 824
 825 #ifndef perf_misc_flags
 826 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_RECORD_MISC_USER : \
 827                                  PERF_RECORD_MISC_KERNEL)
 828 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
 829 #endif
 830
 831 extern int perf_output_begin(struct perf_output_handle *handle,
 832                              struct perf_event *event, unsigned int size,
 833                              int nmi, int sample);
 834 extern void perf_output_end(struct perf_output_handle *handle);
 835 extern void perf_output_copy(struct perf_output_handle *handle,
 836                              const void *buf, unsigned int len);
 837 #else
 838 static inline void
 839 perf_event_task_sched_in(struct task_struct *task, int cpu)             { }
 840 static inline void
 841 perf_event_task_sched_out(struct task_struct *task,
 842                             struct task_struct *next, int cpu)          { }
 843 static inline void
 844 perf_event_task_tick(struct task_struct *task, int cpu)                 { }
 845 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
 846 static inline void perf_event_exit_task(struct task_struct *child)      { }
 847 static inline void perf_event_free_task(struct task_struct *task)       { }
 848 static inline void perf_event_do_pending(void)                          { }
 849 static inline void perf_event_print_debug(void)                         { }
 850 static inline void perf_disable(void)                                   { }
 851 static inline void perf_enable(void)                                    { }
 852 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
 853 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
 854
 855 static inline void
 856 perf_sw_event(u32 event_id, u64 nr, int nmi,
 857                      struct pt_regs *regs, u64 addr)                    { }
 858
 859 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
 860 static inline void perf_event_comm(struct task_struct *tsk)             { }
 861 static inline void perf_event_fork(struct task_struct *tsk)             { }
 862 static inline void perf_event_init(void)                                { }
 863
 864 #endif
 865
 866 #define perf_output_put(handle, x) \
 867         perf_output_copy((handle), &(x), sizeof(x))
 868
 869 #endif /* __KERNEL__ */
 870 #endif /* _LINUX_PERF_EVENT_H */