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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         PERF_TYPE_BREAKPOINT                    = 5,
  35
  36         PERF_TYPE_MAX,                          /* non-ABI */
  37 };
  38
  39 /*
  40  * Generalized performance event event_id types, used by the
  41  * attr.event_id parameter of the sys_perf_event_open()
  42  * syscall:
  43  */
  44 enum perf_hw_id {
  45         /*
  46          * Common hardware events, generalized by the kernel:
  47          */
  48         PERF_COUNT_HW_CPU_CYCLES                = 0,
  49         PERF_COUNT_HW_INSTRUCTIONS              = 1,
  50         PERF_COUNT_HW_CACHE_REFERENCES          = 2,
  51         PERF_COUNT_HW_CACHE_MISSES              = 3,
  52         PERF_COUNT_HW_BRANCH_INSTRUCTIONS       = 4,
  53         PERF_COUNT_HW_BRANCH_MISSES             = 5,
  54         PERF_COUNT_HW_BUS_CYCLES                = 6,
  55
  56         PERF_COUNT_HW_MAX,                      /* non-ABI */
  57 };
  58
  59 /*
  60  * Generalized hardware cache events:
  61  *
  62  *       { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
  63  *       { read, write, prefetch } x
  64  *       { accesses, misses }
  65  */
  66 enum perf_hw_cache_id {
  67         PERF_COUNT_HW_CACHE_L1D                 = 0,
  68         PERF_COUNT_HW_CACHE_L1I                 = 1,
  69         PERF_COUNT_HW_CACHE_LL                  = 2,
  70         PERF_COUNT_HW_CACHE_DTLB                = 3,
  71         PERF_COUNT_HW_CACHE_ITLB                = 4,
  72         PERF_COUNT_HW_CACHE_BPU                 = 5,
  73
  74         PERF_COUNT_HW_CACHE_MAX,                /* non-ABI */
  75 };
  76
  77 enum perf_hw_cache_op_id {
  78         PERF_COUNT_HW_CACHE_OP_READ             = 0,
  79         PERF_COUNT_HW_CACHE_OP_WRITE            = 1,
  80         PERF_COUNT_HW_CACHE_OP_PREFETCH         = 2,
  81
  82         PERF_COUNT_HW_CACHE_OP_MAX,             /* non-ABI */
  83 };
  84
  85 enum perf_hw_cache_op_result_id {
  86         PERF_COUNT_HW_CACHE_RESULT_ACCESS       = 0,
  87         PERF_COUNT_HW_CACHE_RESULT_MISS         = 1,
  88
  89         PERF_COUNT_HW_CACHE_RESULT_MAX,         /* non-ABI */
  90 };
  91
  92 /*
  93  * Special "software" events provided by the kernel, even if the hardware
  94  * does not support performance events. These events measure various
  95  * physical and sw events of the kernel (and allow the profiling of them as
  96  * well):
  97  */
  98 enum perf_sw_ids {
  99         PERF_COUNT_SW_CPU_CLOCK                 = 0,
 100         PERF_COUNT_SW_TASK_CLOCK                = 1,
 101         PERF_COUNT_SW_PAGE_FAULTS               = 2,
 102         PERF_COUNT_SW_CONTEXT_SWITCHES          = 3,
 103         PERF_COUNT_SW_CPU_MIGRATIONS            = 4,
 104         PERF_COUNT_SW_PAGE_FAULTS_MIN           = 5,
 105         PERF_COUNT_SW_PAGE_FAULTS_MAJ           = 6,
 106         PERF_COUNT_SW_ALIGNMENT_FAULTS          = 7,
 107         PERF_COUNT_SW_EMULATION_FAULTS          = 8,
 108
 109         PERF_COUNT_SW_MAX,                      /* non-ABI */
 110 };
 111
 112 /*
 113  * Bits that can be set in attr.sample_type to request information
 114  * in the overflow packets.
 115  */
 116 enum perf_event_sample_format {
 117         PERF_SAMPLE_IP                          = 1U << 0,
 118         PERF_SAMPLE_TID                         = 1U << 1,
 119         PERF_SAMPLE_TIME                        = 1U << 2,
 120         PERF_SAMPLE_ADDR                        = 1U << 3,
 121         PERF_SAMPLE_READ                        = 1U << 4,
 122         PERF_SAMPLE_CALLCHAIN                   = 1U << 5,
 123         PERF_SAMPLE_ID                          = 1U << 6,
 124         PERF_SAMPLE_CPU                         = 1U << 7,
 125         PERF_SAMPLE_PERIOD                      = 1U << 8,
 126         PERF_SAMPLE_STREAM_ID                   = 1U << 9,
 127         PERF_SAMPLE_RAW                         = 1U << 10,
 128
 129         PERF_SAMPLE_MAX = 1U << 11,             /* non-ABI */
 130 };
 131
 132 /*
 133  * The format of the data returned by read() on a perf event fd,
 134  * as specified by attr.read_format:
 135  *
 136  * struct read_format {
 137  *      { u64           value;
 138  *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
 139  *        { u64         time_running; } && PERF_FORMAT_RUNNING
 140  *        { u64         id;           } && PERF_FORMAT_ID
 141  *      } && !PERF_FORMAT_GROUP
 142  *
 143  *      { u64           nr;
 144  *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
 145  *        { u64         time_running; } && PERF_FORMAT_RUNNING
 146  *        { u64         value;
 147  *          { u64       id;           } && PERF_FORMAT_ID
 148  *        }             cntr[nr];
 149  *      } && PERF_FORMAT_GROUP
 150  * };
 151  */
 152 enum perf_event_read_format {
 153         PERF_FORMAT_TOTAL_TIME_ENABLED          = 1U << 0,
 154         PERF_FORMAT_TOTAL_TIME_RUNNING          = 1U << 1,
 155         PERF_FORMAT_ID                          = 1U << 2,
 156         PERF_FORMAT_GROUP                       = 1U << 3,
 157
 158         PERF_FORMAT_MAX = 1U << 4,              /* non-ABI */
 159 };
 160
 161 #define PERF_ATTR_SIZE_VER0     64      /* sizeof first published struct */
 162
 163 /*
 164  * Hardware event_id to monitor via a performance monitoring event:
 165  */
 166 struct perf_event_attr {
 167
 168         /*
 169          * Major type: hardware/software/tracepoint/etc.
 170          */
 171         __u32                   type;
 172
 173         /*
 174          * Size of the attr structure, for fwd/bwd compat.
 175          */
 176         __u32                   size;
 177
 178         /*
 179          * Type specific configuration information.
 180          */
 181         __u64                   config;
 182
 183         union {
 184                 __u64           sample_period;
 185                 __u64           sample_freq;
 186         };
 187
 188         __u64                   sample_type;
 189         __u64                   read_format;
 190
 191         __u64                   disabled       :  1, /* off by default        */
 192                                 inherit        :  1, /* children inherit it   */
 193                                 pinned         :  1, /* must always be on PMU */
 194                                 exclusive      :  1, /* only group on PMU     */
 195                                 exclude_user   :  1, /* don't count user      */
 196                                 exclude_kernel :  1, /* ditto kernel          */
 197                                 exclude_hv     :  1, /* ditto hypervisor      */
 198                                 exclude_idle   :  1, /* don't count when idle */
 199                                 mmap           :  1, /* include mmap data     */
 200                                 comm           :  1, /* include comm data     */
 201                                 freq           :  1, /* use freq, not period  */
 202                                 inherit_stat   :  1, /* per task counts       */
 203                                 enable_on_exec :  1, /* next exec enables     */
 204                                 task           :  1, /* trace fork/exit       */
 205                                 watermark      :  1, /* wakeup_watermark      */
 206
 207                                 __reserved_1   : 49;
 208
 209         union {
 210                 __u32           wakeup_events;    /* wakeup every n events */
 211                 __u32           wakeup_watermark; /* bytes before wakeup   */
 212         };
 213
 214         __u32                   __reserved_2;
 215
 216         __u64                   bp_addr;
 217         __u32                   bp_type;
 218         __u32                   bp_len;
 219 };
 220
 221 /*
 222  * Ioctls that can be done on a perf event fd:
 223  */
 224 #define PERF_EVENT_IOC_ENABLE           _IO ('$', 0)
 225 #define PERF_EVENT_IOC_DISABLE          _IO ('$', 1)
 226 #define PERF_EVENT_IOC_REFRESH          _IO ('$', 2)
 227 #define PERF_EVENT_IOC_RESET            _IO ('$', 3)
 228 #define PERF_EVENT_IOC_PERIOD           _IOW('$', 4, __u64)
 229 #define PERF_EVENT_IOC_SET_OUTPUT       _IO ('$', 5)
 230 #define PERF_EVENT_IOC_SET_FILTER       _IOW('$', 6, char *)
 231
 232 enum perf_event_ioc_flags {
 233         PERF_IOC_FLAG_GROUP             = 1U << 0,
 234 };
 235
 236 /*
 237  * Structure of the page that can be mapped via mmap
 238  */
 239 struct perf_event_mmap_page {
 240         __u32   version;                /* version number of this structure */
 241         __u32   compat_version;         /* lowest version this is compat with */
 242
 243         /*
 244          * Bits needed to read the hw events in user-space.
 245          *
 246          *   u32 seq;
 247          *   s64 count;
 248          *
 249          *   do {
 250          *     seq = pc->lock;
 251          *
 252          *     barrier()
 253          *     if (pc->index) {
 254          *       count = pmc_read(pc->index - 1);
 255          *       count += pc->offset;
 256          *     } else
 257          *       goto regular_read;
 258          *
 259          *     barrier();
 260          *   } while (pc->lock != seq);
 261          *
 262          * NOTE: for obvious reason this only works on self-monitoring
 263          *       processes.
 264          */
 265         __u32   lock;                   /* seqlock for synchronization */
 266         __u32   index;                  /* hardware event identifier */
 267         __s64   offset;                 /* add to hardware event value */
 268         __u64   time_enabled;           /* time event active */
 269         __u64   time_running;           /* time event on cpu */
 270
 271                 /*
 272                  * Hole for extension of the self monitor capabilities
 273                  */
 274
 275         __u64   __reserved[123];        /* align to 1k */
 276
 277         /*
 278          * Control data for the mmap() data buffer.
 279          *
 280          * User-space reading the @data_head value should issue an rmb(), on
 281          * SMP capable platforms, after reading this value -- see
 282          * perf_event_wakeup().
 283          *
 284          * When the mapping is PROT_WRITE the @data_tail value should be
 285          * written by userspace to reflect the last read data. In this case
 286          * the kernel will not over-write unread data.
 287          */
 288         __u64   data_head;              /* head in the data section */
 289         __u64   data_tail;              /* user-space written tail */
 290 };
 291
 292 #define PERF_RECORD_MISC_CPUMODE_MASK           (3 << 0)
 293 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN                (0 << 0)
 294 #define PERF_RECORD_MISC_KERNEL                 (1 << 0)
 295 #define PERF_RECORD_MISC_USER                   (2 << 0)
 296 #define PERF_RECORD_MISC_HYPERVISOR             (3 << 0)
 297
 298 struct perf_event_header {
 299         __u32   type;
 300         __u16   misc;
 301         __u16   size;
 302 };
 303
 304 enum perf_event_type {
 305
 306         /*
 307          * The MMAP events record the PROT_EXEC mappings so that we can
 308          * correlate userspace IPs to code. They have the following structure:
 309          *
 310          * struct {
 311          *      struct perf_event_header        header;
 312          *
 313          *      u32                             pid, tid;
 314          *      u64                             addr;
 315          *      u64                             len;
 316          *      u64                             pgoff;
 317          *      char                            filename[];
 318          * };
 319          */
 320         PERF_RECORD_MMAP                        = 1,
 321
 322         /*
 323          * struct {
 324          *      struct perf_event_header        header;
 325          *      u64                             id;
 326          *      u64                             lost;
 327          * };
 328          */
 329         PERF_RECORD_LOST                        = 2,
 330
 331         /*
 332          * struct {
 333          *      struct perf_event_header        header;
 334          *
 335          *      u32                             pid, tid;
 336          *      char                            comm[];
 337          * };
 338          */
 339         PERF_RECORD_COMM                        = 3,
 340
 341         /*
 342          * struct {
 343          *      struct perf_event_header        header;
 344          *      u32                             pid, ppid;
 345          *      u32                             tid, ptid;
 346          *      u64                             time;
 347          * };
 348          */
 349         PERF_RECORD_EXIT                        = 4,
 350
 351         /*
 352          * struct {
 353          *      struct perf_event_header        header;
 354          *      u64                             time;
 355          *      u64                             id;
 356          *      u64                             stream_id;
 357          * };
 358          */
 359         PERF_RECORD_THROTTLE            = 5,
 360         PERF_RECORD_UNTHROTTLE          = 6,
 361
 362         /*
 363          * struct {
 364          *      struct perf_event_header        header;
 365          *      u32                             pid, ppid;
 366          *      u32                             tid, ptid;
 367          *      u64                             time;
 368          * };
 369          */
 370         PERF_RECORD_FORK                        = 7,
 371
 372         /*
 373          * struct {
 374          *      struct perf_event_header        header;
 375          *      u32                             pid, tid;
 376          *
 377          *      struct read_format              values;
 378          * };
 379          */
 380         PERF_RECORD_READ                        = 8,
 381
 382         /*
 383          * struct {
 384          *      struct perf_event_header        header;
 385          *
 386          *      { u64                   ip;       } && PERF_SAMPLE_IP
 387          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
 388          *      { u64                   time;     } && PERF_SAMPLE_TIME
 389          *      { u64                   addr;     } && PERF_SAMPLE_ADDR
 390          *      { u64                   id;       } && PERF_SAMPLE_ID
 391          *      { u64                   stream_id;} && PERF_SAMPLE_STREAM_ID
 392          *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
 393          *      { u64                   period;   } && PERF_SAMPLE_PERIOD
 394          *
 395          *      { struct read_format    values;   } && PERF_SAMPLE_READ
 396          *
 397          *      { u64                   nr,
 398          *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
 399          *
 400          *      #
 401          *      # The RAW record below is opaque data wrt the ABI
 402          *      #
 403          *      # That is, the ABI doesn't make any promises wrt to
 404          *      # the stability of its content, it may vary depending
 405          *      # on event, hardware, kernel version and phase of
 406          *      # the moon.
 407          *      #
 408          *      # In other words, PERF_SAMPLE_RAW contents are not an ABI.
 409          *      #
 410          *
 411          *      { u32                   size;
 412          *        char                  data[size];}&& PERF_SAMPLE_RAW
 413          * };
 414          */
 415         PERF_RECORD_SAMPLE              = 9,
 416
 417         PERF_RECORD_MAX,                        /* non-ABI */
 418 };
 419
 420 enum perf_callchain_context {
 421         PERF_CONTEXT_HV                 = (__u64)-32,
 422         PERF_CONTEXT_KERNEL             = (__u64)-128,
 423         PERF_CONTEXT_USER               = (__u64)-512,
 424
 425         PERF_CONTEXT_GUEST              = (__u64)-2048,
 426         PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
 427         PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
 428
 429         PERF_CONTEXT_MAX                = (__u64)-4095,
 430 };
 431
 432 #define PERF_FLAG_FD_NO_GROUP   (1U << 0)
 433 #define PERF_FLAG_FD_OUTPUT     (1U << 1)
 434
 435 #ifdef __KERNEL__
 436 /*
 437  * Kernel-internal data types and definitions:
 438  */
 439
 440 #ifdef CONFIG_PERF_EVENTS
 441 # include <asm/perf_event.h>
 442 #endif
 443
 444 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 445 #include <asm/hw_breakpoint.h>
 446 #endif
 447
 448 #include <linux/list.h>
 449 #include <linux/mutex.h>
 450 #include <linux/rculist.h>
 451 #include <linux/rcupdate.h>
 452 #include <linux/spinlock.h>
 453 #include <linux/hrtimer.h>
 454 #include <linux/fs.h>
 455 #include <linux/pid_namespace.h>
 456 #include <linux/workqueue.h>
 457 #include <asm/atomic.h>
 458
 459 #define PERF_MAX_STACK_DEPTH            255
 460
 461 struct perf_callchain_entry {
 462         __u64                           nr;
 463         __u64                           ip[PERF_MAX_STACK_DEPTH];
 464 };
 465
 466 struct perf_raw_record {
 467         u32                             size;
 468         void                            *data;
 469 };
 470
 471 struct task_struct;
 472
 473 /**
 474  * struct hw_perf_event - performance event hardware details:
 475  */
 476 struct hw_perf_event {
 477 #ifdef CONFIG_PERF_EVENTS
 478         union {
 479                 struct { /* hardware */
 480                         u64             config;
 481                         unsigned long   config_base;
 482                         unsigned long   event_base;
 483                         int             idx;
 484                 };
 485                 struct { /* software */
 486                         s64             remaining;
 487                         struct hrtimer  hrtimer;
 488                 };
 489 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 490                 union { /* breakpoint */
 491                         struct arch_hw_breakpoint       info;
 492                 };
 493 #endif
 494         };
 495         atomic64_t                      prev_count;
 496         u64                             sample_period;
 497         u64                             last_period;
 498         atomic64_t                      period_left;
 499         u64                             interrupts;
 500
 501         u64                             freq_count;
 502         u64                             freq_interrupts;
 503         u64                             freq_stamp;
 504 #endif
 505 };
 506
 507 struct perf_event;
 508
 509 /**
 510  * struct pmu - generic performance monitoring unit
 511  */
 512 struct pmu {
 513         int (*enable)                   (struct perf_event *event);
 514         void (*disable)                 (struct perf_event *event);
 515         void (*read)                    (struct perf_event *event);
 516         void (*unthrottle)              (struct perf_event *event);
 517 };
 518
 519 /**
 520  * enum perf_event_active_state - the states of a event
 521  */
 522 enum perf_event_active_state {
 523         PERF_EVENT_STATE_ERROR          = -2,
 524         PERF_EVENT_STATE_OFF            = -1,
 525         PERF_EVENT_STATE_INACTIVE       =  0,
 526         PERF_EVENT_STATE_ACTIVE         =  1,
 527 };
 528
 529 struct file;
 530
 531 struct perf_mmap_data {
 532         struct rcu_head                 rcu_head;
 533 #ifdef CONFIG_PERF_USE_VMALLOC
 534         struct work_struct              work;
 535 #endif
 536         int                             data_order;
 537         int                             nr_pages;       /* nr of data pages  */
 538         int                             writable;       /* are we writable   */
 539         int                             nr_locked;      /* nr pages mlocked  */
 540
 541         atomic_t                        poll;           /* POLL_ for wakeups */
 542         atomic_t                        events;         /* event_id limit       */
 543
 544         atomic_long_t                   head;           /* write position    */
 545         atomic_long_t                   done_head;      /* completed head    */
 546
 547         atomic_t                        lock;           /* concurrent writes */
 548         atomic_t                        wakeup;         /* needs a wakeup    */
 549         atomic_t                        lost;           /* nr records lost   */
 550
 551         long                            watermark;      /* wakeup watermark  */
 552
 553         struct perf_event_mmap_page     *user_page;
 554         void                            *data_pages[0];
 555 };
 556
 557 struct perf_pending_entry {
 558         struct perf_pending_entry *next;
 559         void (*func)(struct perf_pending_entry *);
 560 };
 561
 562 struct perf_sample_data;
 563
 564 typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
 565                                         struct perf_sample_data *,
 566                                         struct pt_regs *regs);
 567
 568 /**
 569  * struct perf_event - performance event kernel representation:
 570  */
 571 struct perf_event {
 572 #ifdef CONFIG_PERF_EVENTS
 573         struct list_head                group_entry;
 574         struct list_head                event_entry;
 575         struct list_head                sibling_list;
 576         int                             nr_siblings;
 577         struct perf_event               *group_leader;
 578         struct perf_event               *output;
 579         const struct pmu                *pmu;
 580
 581         enum perf_event_active_state    state;
 582         atomic64_t                      count;
 583
 584         /*
 585          * These are the total time in nanoseconds that the event
 586          * has been enabled (i.e. eligible to run, and the task has
 587          * been scheduled in, if this is a per-task event)
 588          * and running (scheduled onto the CPU), respectively.
 589          *
 590          * They are computed from tstamp_enabled, tstamp_running and
 591          * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
 592          */
 593         u64                             total_time_enabled;
 594         u64                             total_time_running;
 595
 596         /*
 597          * These are timestamps used for computing total_time_enabled
 598          * and total_time_running when the event is in INACTIVE or
 599          * ACTIVE state, measured in nanoseconds from an arbitrary point
 600          * in time.
 601          * tstamp_enabled: the notional time when the event was enabled
 602          * tstamp_running: the notional time when the event was scheduled on
 603          * tstamp_stopped: in INACTIVE state, the notional time when the
 604          *      event was scheduled off.
 605          */
 606         u64                             tstamp_enabled;
 607         u64                             tstamp_running;
 608         u64                             tstamp_stopped;
 609
 610         struct perf_event_attr          attr;
 611         struct hw_perf_event            hw;
 612
 613         struct perf_event_context       *ctx;
 614         struct file                     *filp;
 615
 616         /*
 617          * These accumulate total time (in nanoseconds) that children
 618          * events have been enabled and running, respectively.
 619          */
 620         atomic64_t                      child_total_time_enabled;
 621         atomic64_t                      child_total_time_running;
 622
 623         /*
 624          * Protect attach/detach and child_list:
 625          */
 626         struct mutex                    child_mutex;
 627         struct list_head                child_list;
 628         struct perf_event               *parent;
 629
 630         int                             oncpu;
 631         int                             cpu;
 632
 633         struct list_head                owner_entry;
 634         struct task_struct              *owner;
 635
 636         /* mmap bits */
 637         struct mutex                    mmap_mutex;
 638         atomic_t                        mmap_count;
 639         struct perf_mmap_data           *data;
 640
 641         /* poll related */
 642         wait_queue_head_t               waitq;
 643         struct fasync_struct            *fasync;
 644
 645         /* delayed work for NMIs and such */
 646         int                             pending_wakeup;
 647         int                             pending_kill;
 648         int                             pending_disable;
 649         struct perf_pending_entry       pending;
 650
 651         atomic_t                        event_limit;
 652
 653         void (*destroy)(struct perf_event *);
 654         struct rcu_head                 rcu_head;
 655
 656         struct pid_namespace            *ns;
 657         u64                             id;
 658
 659         perf_overflow_handler_t         overflow_handler;
 660
 661 #ifdef CONFIG_EVENT_PROFILE
 662         struct event_filter             *filter;
 663 #endif
 664
 665 #endif /* CONFIG_PERF_EVENTS */
 666 };
 667
 668 /**
 669  * struct perf_event_context - event context structure
 670  *
 671  * Used as a container for task events and CPU events as well:
 672  */
 673 struct perf_event_context {
 674         /*
 675          * Protect the states of the events in the list,
 676          * nr_active, and the list:
 677          */
 678         raw_spinlock_t                  lock;
 679         /*
 680          * Protect the list of events.  Locking either mutex or lock
 681          * is sufficient to ensure the list doesn't change; to change
 682          * the list you need to lock both the mutex and the spinlock.
 683          */
 684         struct mutex                    mutex;
 685
 686         struct list_head                group_list;
 687         struct list_head                event_list;
 688         int                             nr_events;
 689         int                             nr_active;
 690         int                             is_active;
 691         int                             nr_stat;
 692         atomic_t                        refcount;
 693         struct task_struct              *task;
 694
 695         /*
 696          * Context clock, runs when context enabled.
 697          */
 698         u64                             time;
 699         u64                             timestamp;
 700
 701         /*
 702          * These fields let us detect when two contexts have both
 703          * been cloned (inherited) from a common ancestor.
 704          */
 705         struct perf_event_context       *parent_ctx;
 706         u64                             parent_gen;
 707         u64                             generation;
 708         int                             pin_count;
 709         struct rcu_head                 rcu_head;
 710 };
 711
 712 /**
 713  * struct perf_event_cpu_context - per cpu event context structure
 714  */
 715 struct perf_cpu_context {
 716         struct perf_event_context       ctx;
 717         struct perf_event_context       *task_ctx;
 718         int                             active_oncpu;
 719         int                             max_pertask;
 720         int                             exclusive;
 721
 722         /*
 723          * Recursion avoidance:
 724          *
 725          * task, softirq, irq, nmi context
 726          */
 727         int                             recursion[4];
 728 };
 729
 730 struct perf_output_handle {
 731         struct perf_event               *event;
 732         struct perf_mmap_data           *data;
 733         unsigned long                   head;
 734         unsigned long                   offset;
 735         int                             nmi;
 736         int                             sample;
 737         int                             locked;
 738 };
 739
 740 #ifdef CONFIG_PERF_EVENTS
 741
 742 /*
 743  * Set by architecture code:
 744  */
 745 extern int perf_max_events;
 746
 747 extern const struct pmu *hw_perf_event_init(struct perf_event *event);
 748
 749 extern void perf_event_task_sched_in(struct task_struct *task, int cpu);
 750 extern void perf_event_task_sched_out(struct task_struct *task,
 751                                         struct task_struct *next, int cpu);
 752 extern void perf_event_task_tick(struct task_struct *task, int cpu);
 753 extern int perf_event_init_task(struct task_struct *child);
 754 extern void perf_event_exit_task(struct task_struct *child);
 755 extern void perf_event_free_task(struct task_struct *task);
 756 extern void set_perf_event_pending(void);
 757 extern void perf_event_do_pending(void);
 758 extern void perf_event_print_debug(void);
 759 extern void __perf_disable(void);
 760 extern bool __perf_enable(void);
 761 extern void perf_disable(void);
 762 extern void perf_enable(void);
 763 extern int perf_event_task_disable(void);
 764 extern int perf_event_task_enable(void);
 765 extern int hw_perf_group_sched_in(struct perf_event *group_leader,
 766                struct perf_cpu_context *cpuctx,
 767                struct perf_event_context *ctx, int cpu);
 768 extern void perf_event_update_userpage(struct perf_event *event);
 769 extern int perf_event_release_kernel(struct perf_event *event);
 770 extern struct perf_event *
 771 perf_event_create_kernel_counter(struct perf_event_attr *attr,
 772                                 int cpu,
 773                                 pid_t pid,
 774                                 perf_overflow_handler_t callback);
 775 extern u64 perf_event_read_value(struct perf_event *event,
 776                                  u64 *enabled, u64 *running);
 777
 778 struct perf_sample_data {
 779         u64                             type;
 780
 781         u64                             ip;
 782         struct {
 783                 u32     pid;
 784                 u32     tid;
 785         }                               tid_entry;
 786         u64                             time;
 787         u64                             addr;
 788         u64                             id;
 789         u64                             stream_id;
 790         struct {
 791                 u32     cpu;
 792                 u32     reserved;
 793         }                               cpu_entry;
 794         u64                             period;
 795         struct perf_callchain_entry     *callchain;
 796         struct perf_raw_record          *raw;
 797 };
 798
 799 extern void perf_output_sample(struct perf_output_handle *handle,
 800                                struct perf_event_header *header,
 801                                struct perf_sample_data *data,
 802                                struct perf_event *event);
 803 extern void perf_prepare_sample(struct perf_event_header *header,
 804                                 struct perf_sample_data *data,
 805                                 struct perf_event *event,
 806                                 struct pt_regs *regs);
 807
 808 extern int perf_event_overflow(struct perf_event *event, int nmi,
 809                                  struct perf_sample_data *data,
 810                                  struct pt_regs *regs);
 811
 812 /*
 813  * Return 1 for a software event, 0 for a hardware event
 814  */
 815 static inline int is_software_event(struct perf_event *event)
 816 {
 817         switch (event->attr.type) {
 818         case PERF_TYPE_SOFTWARE:
 819         case PERF_TYPE_TRACEPOINT:
 820         /* for now the breakpoint stuff also works as software event */
 821         case PERF_TYPE_BREAKPOINT:
 822                 return 1;
 823         }
 824         return 0;
 825 }
 826
 827 extern atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX];
 828
 829 extern void __perf_sw_event(u32, u64, int, struct pt_regs *, u64);
 830
 831 static inline void
 832 perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
 833 {
 834         if (atomic_read(&perf_swevent_enabled[event_id]))
 835                 __perf_sw_event(event_id, nr, nmi, regs, addr);
 836 }
 837
 838 extern void __perf_event_mmap(struct vm_area_struct *vma);
 839
 840 static inline void perf_event_mmap(struct vm_area_struct *vma)
 841 {
 842         if (vma->vm_flags & VM_EXEC)
 843                 __perf_event_mmap(vma);
 844 }
 845
 846 extern void perf_event_comm(struct task_struct *tsk);
 847 extern void perf_event_fork(struct task_struct *tsk);
 848
 849 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 850
 851 extern int sysctl_perf_event_paranoid;
 852 extern int sysctl_perf_event_mlock;
 853 extern int sysctl_perf_event_sample_rate;
 854
 855 extern void perf_event_init(void);
 856 extern void perf_tp_event(int event_id, u64 addr, u64 count,
 857                                  void *record, int entry_size);
 858 extern void perf_bp_event(struct perf_event *event, void *data);
 859
 860 #ifndef perf_misc_flags
 861 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_RECORD_MISC_USER : \
 862                                  PERF_RECORD_MISC_KERNEL)
 863 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
 864 #endif
 865
 866 extern int perf_output_begin(struct perf_output_handle *handle,
 867                              struct perf_event *event, unsigned int size,
 868                              int nmi, int sample);
 869 extern void perf_output_end(struct perf_output_handle *handle);
 870 extern void perf_output_copy(struct perf_output_handle *handle,
 871                              const void *buf, unsigned int len);
 872 extern int perf_swevent_get_recursion_context(void);
 873 extern void perf_swevent_put_recursion_context(int rctx);
 874 extern void perf_event_enable(struct perf_event *event);
 875 extern void perf_event_disable(struct perf_event *event);
 876 #else
 877 static inline void
 878 perf_event_task_sched_in(struct task_struct *task, int cpu)             { }
 879 static inline void
 880 perf_event_task_sched_out(struct task_struct *task,
 881                             struct task_struct *next, int cpu)          { }
 882 static inline void
 883 perf_event_task_tick(struct task_struct *task, int cpu)                 { }
 884 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
 885 static inline void perf_event_exit_task(struct task_struct *child)      { }
 886 static inline void perf_event_free_task(struct task_struct *task)       { }
 887 static inline void perf_event_do_pending(void)                          { }
 888 static inline void perf_event_print_debug(void)                         { }
 889 static inline void perf_disable(void)                                   { }
 890 static inline void perf_enable(void)                                    { }
 891 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
 892 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
 893
 894 static inline void
 895 perf_sw_event(u32 event_id, u64 nr, int nmi,
 896                      struct pt_regs *regs, u64 addr)                    { }
 897 static inline void
 898 perf_bp_event(struct perf_event *event, void *data)             { }
 899
 900 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
 901 static inline void perf_event_comm(struct task_struct *tsk)             { }
 902 static inline void perf_event_fork(struct task_struct *tsk)             { }
 903 static inline void perf_event_init(void)                                { }
 904 static inline int  perf_swevent_get_recursion_context(void)  { return -1; }
 905 static inline void perf_swevent_put_recursion_context(int rctx)         { }
 906 static inline void perf_event_enable(struct perf_event *event)          { }
 907 static inline void perf_event_disable(struct perf_event *event)         { }
 908 #endif
 909
 910 #define perf_output_put(handle, x) \
 911         perf_output_copy((handle), &(x), sizeof(x))
 912
 913 #endif /* __KERNEL__ */
 914 #endif /* _LINUX_PERF_EVENT_H */