include/linux/perf_event.h

   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                                  * precise_ip:
 208                                  *
 209                                  *  0 - SAMPLE_IP can have arbitrary skid
 210                                  *  1 - SAMPLE_IP must have constant skid
 211                                  *  2 - SAMPLE_IP requested to have 0 skid
 212                                  *  3 - SAMPLE_IP must have 0 skid
 213                                  *
 214                                  *  See also PERF_RECORD_MISC_EXACT_IP
 215                                  */
 216                                 precise_ip     :  2, /* skid constraint       */
 217
 218                                 __reserved_1   : 47;
 219
 220         union {
 221                 __u32           wakeup_events;    /* wakeup every n events */
 222                 __u32           wakeup_watermark; /* bytes before wakeup   */
 223         };
 224
 225         __u32                   bp_type;
 226         __u64                   bp_addr;
 227         __u64                   bp_len;
 228 };
 229
 230 /*
 231  * Ioctls that can be done on a perf event fd:
 232  */
 233 #define PERF_EVENT_IOC_ENABLE           _IO ('$', 0)
 234 #define PERF_EVENT_IOC_DISABLE          _IO ('$', 1)
 235 #define PERF_EVENT_IOC_REFRESH          _IO ('$', 2)
 236 #define PERF_EVENT_IOC_RESET            _IO ('$', 3)
 237 #define PERF_EVENT_IOC_PERIOD           _IOW('$', 4, __u64)
 238 #define PERF_EVENT_IOC_SET_OUTPUT       _IO ('$', 5)
 239 #define PERF_EVENT_IOC_SET_FILTER       _IOW('$', 6, char *)
 240
 241 enum perf_event_ioc_flags {
 242         PERF_IOC_FLAG_GROUP             = 1U << 0,
 243 };
 244
 245 /*
 246  * Structure of the page that can be mapped via mmap
 247  */
 248 struct perf_event_mmap_page {
 249         __u32   version;                /* version number of this structure */
 250         __u32   compat_version;         /* lowest version this is compat with */
 251
 252         /*
 253          * Bits needed to read the hw events in user-space.
 254          *
 255          *   u32 seq;
 256          *   s64 count;
 257          *
 258          *   do {
 259          *     seq = pc->lock;
 260          *
 261          *     barrier()
 262          *     if (pc->index) {
 263          *       count = pmc_read(pc->index - 1);
 264          *       count += pc->offset;
 265          *     } else
 266          *       goto regular_read;
 267          *
 268          *     barrier();
 269          *   } while (pc->lock != seq);
 270          *
 271          * NOTE: for obvious reason this only works on self-monitoring
 272          *       processes.
 273          */
 274         __u32   lock;                   /* seqlock for synchronization */
 275         __u32   index;                  /* hardware event identifier */
 276         __s64   offset;                 /* add to hardware event value */
 277         __u64   time_enabled;           /* time event active */
 278         __u64   time_running;           /* time event on cpu */
 279
 280                 /*
 281                  * Hole for extension of the self monitor capabilities
 282                  */
 283
 284         __u64   __reserved[123];        /* align to 1k */
 285
 286         /*
 287          * Control data for the mmap() data buffer.
 288          *
 289          * User-space reading the @data_head value should issue an rmb(), on
 290          * SMP capable platforms, after reading this value -- see
 291          * perf_event_wakeup().
 292          *
 293          * When the mapping is PROT_WRITE the @data_tail value should be
 294          * written by userspace to reflect the last read data. In this case
 295          * the kernel will not over-write unread data.
 296          */
 297         __u64   data_head;              /* head in the data section */
 298         __u64   data_tail;              /* user-space written tail */
 299 };
 300
 301 #define PERF_RECORD_MISC_CPUMODE_MASK           (7 << 0)
 302 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN        (0 << 0)
 303 #define PERF_RECORD_MISC_KERNEL                 (1 << 0)
 304 #define PERF_RECORD_MISC_USER                   (2 << 0)
 305 #define PERF_RECORD_MISC_HYPERVISOR             (3 << 0)
 306 #define PERF_RECORD_MISC_GUEST_KERNEL           (4 << 0)
 307 #define PERF_RECORD_MISC_GUEST_USER             (5 << 0)
 308
 309 /*
 310  * Indicates that the content of PERF_SAMPLE_IP points to
 311  * the actual instruction that triggered the event. See also
 312  * perf_event_attr::precise_ip.
 313  */
 314 #define PERF_RECORD_MISC_EXACT_IP               (1 << 14)
 315 /*
 316  * Reserve the last bit to indicate some extended misc field
 317  */
 318 #define PERF_RECORD_MISC_EXT_RESERVED           (1 << 15)
 319
 320 struct perf_event_header {
 321         __u32   type;
 322         __u16   misc;
 323         __u16   size;
 324 };
 325
 326 enum perf_event_type {
 327
 328         /*
 329          * The MMAP events record the PROT_EXEC mappings so that we can
 330          * correlate userspace IPs to code. They have the following structure:
 331          *
 332          * struct {
 333          *      struct perf_event_header        header;
 334          *
 335          *      u32                             pid, tid;
 336          *      u64                             addr;
 337          *      u64                             len;
 338          *      u64                             pgoff;
 339          *      char                            filename[];
 340          * };
 341          */
 342         PERF_RECORD_MMAP                        = 1,
 343
 344         /*
 345          * struct {
 346          *      struct perf_event_header        header;
 347          *      u64                             id;
 348          *      u64                             lost;
 349          * };
 350          */
 351         PERF_RECORD_LOST                        = 2,
 352
 353         /*
 354          * struct {
 355          *      struct perf_event_header        header;
 356          *
 357          *      u32                             pid, tid;
 358          *      char                            comm[];
 359          * };
 360          */
 361         PERF_RECORD_COMM                        = 3,
 362
 363         /*
 364          * struct {
 365          *      struct perf_event_header        header;
 366          *      u32                             pid, ppid;
 367          *      u32                             tid, ptid;
 368          *      u64                             time;
 369          * };
 370          */
 371         PERF_RECORD_EXIT                        = 4,
 372
 373         /*
 374          * struct {
 375          *      struct perf_event_header        header;
 376          *      u64                             time;
 377          *      u64                             id;
 378          *      u64                             stream_id;
 379          * };
 380          */
 381         PERF_RECORD_THROTTLE                    = 5,
 382         PERF_RECORD_UNTHROTTLE                  = 6,
 383
 384         /*
 385          * struct {
 386          *      struct perf_event_header        header;
 387          *      u32                             pid, ppid;
 388          *      u32                             tid, ptid;
 389          *      u64                             time;
 390          * };
 391          */
 392         PERF_RECORD_FORK                        = 7,
 393
 394         /*
 395          * struct {
 396          *      struct perf_event_header        header;
 397          *      u32                             pid, tid;
 398          *
 399          *      struct read_format              values;
 400          * };
 401          */
 402         PERF_RECORD_READ                        = 8,
 403
 404         /*
 405          * struct {
 406          *      struct perf_event_header        header;
 407          *
 408          *      { u64                   ip;       } && PERF_SAMPLE_IP
 409          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
 410          *      { u64                   time;     } && PERF_SAMPLE_TIME
 411          *      { u64                   addr;     } && PERF_SAMPLE_ADDR
 412          *      { u64                   id;       } && PERF_SAMPLE_ID
 413          *      { u64                   stream_id;} && PERF_SAMPLE_STREAM_ID
 414          *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
 415          *      { u64                   period;   } && PERF_SAMPLE_PERIOD
 416          *
 417          *      { struct read_format    values;   } && PERF_SAMPLE_READ
 418          *
 419          *      { u64                   nr,
 420          *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
 421          *
 422          *      #
 423          *      # The RAW record below is opaque data wrt the ABI
 424          *      #
 425          *      # That is, the ABI doesn't make any promises wrt to
 426          *      # the stability of its content, it may vary depending
 427          *      # on event, hardware, kernel version and phase of
 428          *      # the moon.
 429          *      #
 430          *      # In other words, PERF_SAMPLE_RAW contents are not an ABI.
 431          *      #
 432          *
 433          *      { u32                   size;
 434          *        char                  data[size];}&& PERF_SAMPLE_RAW
 435          * };
 436          */
 437         PERF_RECORD_SAMPLE                      = 9,
 438
 439         PERF_RECORD_MAX,                        /* non-ABI */
 440 };
 441
 442 enum perf_callchain_context {
 443         PERF_CONTEXT_HV                 = (__u64)-32,
 444         PERF_CONTEXT_KERNEL             = (__u64)-128,
 445         PERF_CONTEXT_USER               = (__u64)-512,
 446
 447         PERF_CONTEXT_GUEST              = (__u64)-2048,
 448         PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
 449         PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
 450
 451         PERF_CONTEXT_MAX                = (__u64)-4095,
 452 };
 453
 454 #define PERF_FLAG_FD_NO_GROUP   (1U << 0)
 455 #define PERF_FLAG_FD_OUTPUT     (1U << 1)
 456
 457 #ifdef __KERNEL__
 458 /*
 459  * Kernel-internal data types and definitions:
 460  */
 461
 462 #ifdef CONFIG_PERF_EVENTS
 463 # include <asm/perf_event.h>
 464 #endif
 465
 466 struct perf_guest_info_callbacks {
 467         int (*is_in_guest) (void);
 468         int (*is_user_mode) (void);
 469         unsigned long (*get_guest_ip) (void);
 470 };
 471
 472 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 473 #include <asm/hw_breakpoint.h>
 474 #endif
 475
 476 #include <linux/list.h>
 477 #include <linux/mutex.h>
 478 #include <linux/rculist.h>
 479 #include <linux/rcupdate.h>
 480 #include <linux/spinlock.h>
 481 #include <linux/hrtimer.h>
 482 #include <linux/fs.h>
 483 #include <linux/pid_namespace.h>
 484 #include <linux/workqueue.h>
 485 #include <linux/ftrace.h>
 486 #include <linux/cpu.h>
 487 #include <asm/atomic.h>
 488
 489 #define PERF_MAX_STACK_DEPTH            255
 490
 491 struct perf_callchain_entry {
 492         __u64                           nr;
 493         __u64                           ip[PERF_MAX_STACK_DEPTH];
 494 };
 495
 496 struct perf_raw_record {
 497         u32                             size;
 498         void                            *data;
 499 };
 500
 501 struct perf_branch_entry {
 502         __u64                           from;
 503         __u64                           to;
 504         __u64                           flags;
 505 };
 506
 507 struct perf_branch_stack {
 508         __u64                           nr;
 509         struct perf_branch_entry        entries[0];
 510 };
 511
 512 struct task_struct;
 513
 514 /**
 515  * struct hw_perf_event - performance event hardware details:
 516  */
 517 struct hw_perf_event {
 518 #ifdef CONFIG_PERF_EVENTS
 519         union {
 520                 struct { /* hardware */
 521                         u64             config;
 522                         u64             last_tag;
 523                         unsigned long   config_base;
 524                         unsigned long   event_base;
 525                         int             idx;
 526                         int             last_cpu;
 527                 };
 528                 struct { /* software */
 529                         s64             remaining;
 530                         struct hrtimer  hrtimer;
 531                 };
 532 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 533                 /* breakpoint */
 534                 struct arch_hw_breakpoint       info;
 535 #endif
 536         };
 537         atomic64_t                      prev_count;
 538         u64                             sample_period;
 539         u64                             last_period;
 540         atomic64_t                      period_left;
 541         u64                             interrupts;
 542
 543         u64                             freq_time_stamp;
 544         u64                             freq_count_stamp;
 545 #endif
 546 };
 547
 548 struct perf_event;
 549
 550 #define PERF_EVENT_TXN_STARTED 1
 551
 552 /**
 553  * struct pmu - generic performance monitoring unit
 554  */
 555 struct pmu {
 556         int (*enable)                   (struct perf_event *event);
 557         void (*disable)                 (struct perf_event *event);
 558         int (*start)                    (struct perf_event *event);
 559         void (*stop)                    (struct perf_event *event);
 560         void (*read)                    (struct perf_event *event);
 561         void (*unthrottle)              (struct perf_event *event);
 562
 563         /*
 564          * group events scheduling is treated as a transaction,
 565          * add group events as a whole and perform one schedulability test.
 566          * If test fails, roll back the whole group
 567          */
 568
 569         void (*start_txn)       (const struct pmu *pmu);
 570         void (*cancel_txn)      (const struct pmu *pmu);
 571         int  (*commit_txn)      (const struct pmu *pmu);
 572 };
 573
 574 /**
 575  * enum perf_event_active_state - the states of a event
 576  */
 577 enum perf_event_active_state {
 578         PERF_EVENT_STATE_ERROR          = -2,
 579         PERF_EVENT_STATE_OFF            = -1,
 580         PERF_EVENT_STATE_INACTIVE       =  0,
 581         PERF_EVENT_STATE_ACTIVE         =  1,
 582 };
 583
 584 struct file;
 585
 586 struct perf_mmap_data {
 587         struct rcu_head                 rcu_head;
 588 #ifdef CONFIG_PERF_USE_VMALLOC
 589         struct work_struct              work;
 590 #endif
 591         int                             data_order;
 592         int                             nr_pages;       /* nr of data pages  */
 593         int                             writable;       /* are we writable   */
 594         int                             nr_locked;      /* nr pages mlocked  */
 595
 596         atomic_t                        poll;           /* POLL_ for wakeups */
 597         atomic_t                        events;         /* event_id limit       */
 598
 599         atomic_long_t                   head;           /* write position    */
 600         atomic_long_t                   done_head;      /* completed head    */
 601
 602         atomic_t                        lock;           /* concurrent writes */
 603         atomic_t                        wakeup;         /* needs a wakeup    */
 604         atomic_t                        lost;           /* nr records lost   */
 605
 606         long                            watermark;      /* wakeup watermark  */
 607
 608         struct perf_event_mmap_page     *user_page;
 609         void                            *data_pages[0];
 610 };
 611
 612 struct perf_pending_entry {
 613         struct perf_pending_entry *next;
 614         void (*func)(struct perf_pending_entry *);
 615 };
 616
 617 struct perf_sample_data;
 618
 619 typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
 620                                         struct perf_sample_data *,
 621                                         struct pt_regs *regs);
 622
 623 enum perf_group_flag {
 624         PERF_GROUP_SOFTWARE = 0x1,
 625 };
 626
 627 #define SWEVENT_HLIST_BITS      8
 628 #define SWEVENT_HLIST_SIZE      (1 << SWEVENT_HLIST_BITS)
 629
 630 struct swevent_hlist {
 631         struct hlist_head       heads[SWEVENT_HLIST_SIZE];
 632         struct rcu_head         rcu_head;
 633 };
 634
 635 /**
 636  * struct perf_event - performance event kernel representation:
 637  */
 638 struct perf_event {
 639 #ifdef CONFIG_PERF_EVENTS
 640         struct list_head                group_entry;
 641         struct list_head                event_entry;
 642         struct list_head                sibling_list;
 643         struct hlist_node               hlist_entry;
 644         int                             nr_siblings;
 645         int                             group_flags;
 646         struct perf_event               *group_leader;
 647         struct perf_event               *output;
 648         const struct pmu                *pmu;
 649
 650         enum perf_event_active_state    state;
 651         atomic64_t                      count;
 652
 653         /*
 654          * These are the total time in nanoseconds that the event
 655          * has been enabled (i.e. eligible to run, and the task has
 656          * been scheduled in, if this is a per-task event)
 657          * and running (scheduled onto the CPU), respectively.
 658          *
 659          * They are computed from tstamp_enabled, tstamp_running and
 660          * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
 661          */
 662         u64                             total_time_enabled;
 663         u64                             total_time_running;
 664
 665         /*
 666          * These are timestamps used for computing total_time_enabled
 667          * and total_time_running when the event is in INACTIVE or
 668          * ACTIVE state, measured in nanoseconds from an arbitrary point
 669          * in time.
 670          * tstamp_enabled: the notional time when the event was enabled
 671          * tstamp_running: the notional time when the event was scheduled on
 672          * tstamp_stopped: in INACTIVE state, the notional time when the
 673          *      event was scheduled off.
 674          */
 675         u64                             tstamp_enabled;
 676         u64                             tstamp_running;
 677         u64                             tstamp_stopped;
 678
 679         struct perf_event_attr          attr;
 680         struct hw_perf_event            hw;
 681
 682         struct perf_event_context       *ctx;
 683         struct file                     *filp;
 684
 685         /*
 686          * These accumulate total time (in nanoseconds) that children
 687          * events have been enabled and running, respectively.
 688          */
 689         atomic64_t                      child_total_time_enabled;
 690         atomic64_t                      child_total_time_running;
 691
 692         /*
 693          * Protect attach/detach and child_list:
 694          */
 695         struct mutex                    child_mutex;
 696         struct list_head                child_list;
 697         struct perf_event               *parent;
 698
 699         int                             oncpu;
 700         int                             cpu;
 701
 702         struct list_head                owner_entry;
 703         struct task_struct              *owner;
 704
 705         /* mmap bits */
 706         struct mutex                    mmap_mutex;
 707         atomic_t                        mmap_count;
 708         struct perf_mmap_data           *data;
 709
 710         /* poll related */
 711         wait_queue_head_t               waitq;
 712         struct fasync_struct            *fasync;
 713
 714         /* delayed work for NMIs and such */
 715         int                             pending_wakeup;
 716         int                             pending_kill;
 717         int                             pending_disable;
 718         struct perf_pending_entry       pending;
 719
 720         atomic_t                        event_limit;
 721
 722         void (*destroy)(struct perf_event *);
 723         struct rcu_head                 rcu_head;
 724
 725         struct pid_namespace            *ns;
 726         u64                             id;
 727
 728         perf_overflow_handler_t         overflow_handler;
 729
 730 #ifdef CONFIG_EVENT_TRACING
 731         struct event_filter             *filter;
 732 #endif
 733
 734 #endif /* CONFIG_PERF_EVENTS */
 735 };
 736
 737 /**
 738  * struct perf_event_context - event context structure
 739  *
 740  * Used as a container for task events and CPU events as well:
 741  */
 742 struct perf_event_context {
 743         /*
 744          * Protect the states of the events in the list,
 745          * nr_active, and the list:
 746          */
 747         raw_spinlock_t                  lock;
 748         /*
 749          * Protect the list of events.  Locking either mutex or lock
 750          * is sufficient to ensure the list doesn't change; to change
 751          * the list you need to lock both the mutex and the spinlock.
 752          */
 753         struct mutex                    mutex;
 754
 755         struct list_head                pinned_groups;
 756         struct list_head                flexible_groups;
 757         struct list_head                event_list;
 758         int                             nr_events;
 759         int                             nr_active;
 760         int                             is_active;
 761         int                             nr_stat;
 762         atomic_t                        refcount;
 763         struct task_struct              *task;
 764
 765         /*
 766          * Context clock, runs when context enabled.
 767          */
 768         u64                             time;
 769         u64                             timestamp;
 770
 771         /*
 772          * These fields let us detect when two contexts have both
 773          * been cloned (inherited) from a common ancestor.
 774          */
 775         struct perf_event_context       *parent_ctx;
 776         u64                             parent_gen;
 777         u64                             generation;
 778         int                             pin_count;
 779         struct rcu_head                 rcu_head;
 780 };
 781
 782 /**
 783  * struct perf_event_cpu_context - per cpu event context structure
 784  */
 785 struct perf_cpu_context {
 786         struct perf_event_context       ctx;
 787         struct perf_event_context       *task_ctx;
 788         int                             active_oncpu;
 789         int                             max_pertask;
 790         int                             exclusive;
 791         struct swevent_hlist            *swevent_hlist;
 792         struct mutex                    hlist_mutex;
 793         int                             hlist_refcount;
 794
 795         /*
 796          * Recursion avoidance:
 797          *
 798          * task, softirq, irq, nmi context
 799          */
 800         int                             recursion[4];
 801 };
 802
 803 struct perf_output_handle {
 804         struct perf_event               *event;
 805         struct perf_mmap_data           *data;
 806         unsigned long                   head;
 807         unsigned long                   offset;
 808         int                             nmi;
 809         int                             sample;
 810         int                             locked;
 811 };
 812
 813 #ifdef CONFIG_PERF_EVENTS
 814
 815 /*
 816  * Set by architecture code:
 817  */
 818 extern int perf_max_events;
 819
 820 extern const struct pmu *hw_perf_event_init(struct perf_event *event);
 821
 822 extern void perf_event_task_sched_in(struct task_struct *task);
 823 extern void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
 824 extern void perf_event_task_tick(struct task_struct *task);
 825 extern int perf_event_init_task(struct task_struct *child);
 826 extern void perf_event_exit_task(struct task_struct *child);
 827 extern void perf_event_free_task(struct task_struct *task);
 828 extern void set_perf_event_pending(void);
 829 extern void perf_event_do_pending(void);
 830 extern void perf_event_print_debug(void);
 831 extern void __perf_disable(void);
 832 extern bool __perf_enable(void);
 833 extern void perf_disable(void);
 834 extern void perf_enable(void);
 835 extern int perf_event_task_disable(void);
 836 extern int perf_event_task_enable(void);
 837 extern void perf_event_update_userpage(struct perf_event *event);
 838 extern int perf_event_release_kernel(struct perf_event *event);
 839 extern struct perf_event *
 840 perf_event_create_kernel_counter(struct perf_event_attr *attr,
 841                                 int cpu,
 842                                 pid_t pid,
 843                                 perf_overflow_handler_t callback);
 844 extern u64 perf_event_read_value(struct perf_event *event,
 845                                  u64 *enabled, u64 *running);
 846
 847 struct perf_sample_data {
 848         u64                             type;
 849
 850         u64                             ip;
 851         struct {
 852                 u32     pid;
 853                 u32     tid;
 854         }                               tid_entry;
 855         u64                             time;
 856         u64                             addr;
 857         u64                             id;
 858         u64                             stream_id;
 859         struct {
 860                 u32     cpu;
 861                 u32     reserved;
 862         }                               cpu_entry;
 863         u64                             period;
 864         struct perf_callchain_entry     *callchain;
 865         struct perf_raw_record          *raw;
 866 };
 867
 868 static inline
 869 void perf_sample_data_init(struct perf_sample_data *data, u64 addr)
 870 {
 871         data->addr = addr;
 872         data->raw  = NULL;
 873 }
 874
 875 extern void perf_output_sample(struct perf_output_handle *handle,
 876                                struct perf_event_header *header,
 877                                struct perf_sample_data *data,
 878                                struct perf_event *event);
 879 extern void perf_prepare_sample(struct perf_event_header *header,
 880                                 struct perf_sample_data *data,
 881                                 struct perf_event *event,
 882                                 struct pt_regs *regs);
 883
 884 extern int perf_event_overflow(struct perf_event *event, int nmi,
 885                                  struct perf_sample_data *data,
 886                                  struct pt_regs *regs);
 887
 888 /*
 889  * Return 1 for a software event, 0 for a hardware event
 890  */
 891 static inline int is_software_event(struct perf_event *event)
 892 {
 893         switch (event->attr.type) {
 894         case PERF_TYPE_SOFTWARE:
 895         case PERF_TYPE_TRACEPOINT:
 896         /* for now the breakpoint stuff also works as software event */
 897         case PERF_TYPE_BREAKPOINT:
 898                 return 1;
 899         }
 900         return 0;
 901 }
 902
 903 extern atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX];
 904
 905 extern void __perf_sw_event(u32, u64, int, struct pt_regs *, u64);
 906
 907 extern void
 908 perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip);
 909
 910 /*
 911  * Take a snapshot of the regs. Skip ip and frame pointer to
 912  * the nth caller. We only need a few of the regs:
 913  * - ip for PERF_SAMPLE_IP
 914  * - cs for user_mode() tests
 915  * - bp for callchains
 916  * - eflags, for future purposes, just in case
 917  */
 918 static inline void perf_fetch_caller_regs(struct pt_regs *regs, int skip)
 919 {
 920         unsigned long ip;
 921
 922         memset(regs, 0, sizeof(*regs));
 923
 924         switch (skip) {
 925         case 1 :
 926                 ip = CALLER_ADDR0;
 927                 break;
 928         case 2 :
 929                 ip = CALLER_ADDR1;
 930                 break;
 931         case 3 :
 932                 ip = CALLER_ADDR2;
 933                 break;
 934         case 4:
 935                 ip = CALLER_ADDR3;
 936                 break;
 937         /* No need to support further for now */
 938         default:
 939                 ip = 0;
 940         }
 941
 942         return perf_arch_fetch_caller_regs(regs, ip, skip);
 943 }
 944
 945 static inline void
 946 perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
 947 {
 948         if (atomic_read(&perf_swevent_enabled[event_id])) {
 949                 struct pt_regs hot_regs;
 950
 951                 if (!regs) {
 952                         perf_fetch_caller_regs(&hot_regs, 1);
 953                         regs = &hot_regs;
 954                 }
 955                 __perf_sw_event(event_id, nr, nmi, regs, addr);
 956         }
 957 }
 958
 959 extern void __perf_event_mmap(struct vm_area_struct *vma);
 960
 961 static inline void perf_event_mmap(struct vm_area_struct *vma)
 962 {
 963         if (vma->vm_flags & VM_EXEC)
 964                 __perf_event_mmap(vma);
 965 }
 966
 967 extern struct perf_guest_info_callbacks *perf_guest_cbs;
 968 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 969 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 970
 971 extern void perf_event_comm(struct task_struct *tsk);
 972 extern void perf_event_fork(struct task_struct *tsk);
 973
 974 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 975
 976 extern int sysctl_perf_event_paranoid;
 977 extern int sysctl_perf_event_mlock;
 978 extern int sysctl_perf_event_sample_rate;
 979
 980 static inline bool perf_paranoid_tracepoint_raw(void)
 981 {
 982         return sysctl_perf_event_paranoid > -1;
 983 }
 984
 985 static inline bool perf_paranoid_cpu(void)
 986 {
 987         return sysctl_perf_event_paranoid > 0;
 988 }
 989
 990 static inline bool perf_paranoid_kernel(void)
 991 {
 992         return sysctl_perf_event_paranoid > 1;
 993 }
 994
 995 extern void perf_event_init(void);
 996 extern void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
 997                           int entry_size, struct pt_regs *regs);
 998 extern void perf_bp_event(struct perf_event *event, void *data);
 999
1000 #ifndef perf_misc_flags
1001 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_RECORD_MISC_USER : \
1002                                  PERF_RECORD_MISC_KERNEL)
1003 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
1004 #endif
1005
1006 extern int perf_output_begin(struct perf_output_handle *handle,
1007                              struct perf_event *event, unsigned int size,
1008                              int nmi, int sample);
1009 extern void perf_output_end(struct perf_output_handle *handle);
1010 extern void perf_output_copy(struct perf_output_handle *handle,
1011                              const void *buf, unsigned int len);
1012 extern int perf_swevent_get_recursion_context(void);
1013 extern void perf_swevent_put_recursion_context(int rctx);
1014 extern void perf_event_enable(struct perf_event *event);
1015 extern void perf_event_disable(struct perf_event *event);
1016 #else
1017 static inline void
1018 perf_event_task_sched_in(struct task_struct *task)                      { }
1019 static inline void
1020 perf_event_task_sched_out(struct task_struct *task,
1021                             struct task_struct *next)                   { }
1022 static inline void
1023 perf_event_task_tick(struct task_struct *task)                          { }
1024 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
1025 static inline void perf_event_exit_task(struct task_struct *child)      { }
1026 static inline void perf_event_free_task(struct task_struct *task)       { }
1027 static inline void perf_event_do_pending(void)                          { }
1028 static inline void perf_event_print_debug(void)                         { }
1029 static inline void perf_disable(void)                                   { }
1030 static inline void perf_enable(void)                                    { }
1031 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
1032 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
1033
1034 static inline void
1035 perf_sw_event(u32 event_id, u64 nr, int nmi,
1036                      struct pt_regs *regs, u64 addr)                    { }
1037 static inline void
1038 perf_bp_event(struct perf_event *event, void *data)                     { }
1039
1040 static inline int perf_register_guest_info_callbacks
1041 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1042 static inline int perf_unregister_guest_info_callbacks
1043 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1044
1045 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
1046 static inline void perf_event_comm(struct task_struct *tsk)             { }
1047 static inline void perf_event_fork(struct task_struct *tsk)             { }
1048 static inline void perf_event_init(void)                                { }
1049 static inline int  perf_swevent_get_recursion_context(void)             { return -1; }
1050 static inline void perf_swevent_put_recursion_context(int rctx)         { }
1051 static inline void perf_event_enable(struct perf_event *event)          { }
1052 static inline void perf_event_disable(struct perf_event *event)         { }
1053 #endif
1054
1055 #define perf_output_put(handle, x) \
1056         perf_output_copy((handle), &(x), sizeof(x))
1057
1058 /*
1059  * This has to have a higher priority than migration_notifier in sched.c.
1060  */
1061 #define perf_cpu_notifier(fn)                                   \
1062 do {                                                            \
1063         static struct notifier_block fn##_nb __cpuinitdata =    \
1064                 { .notifier_call = fn, .priority = 20 };        \
1065         fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,             \
1066                 (void *)(unsigned long)smp_processor_id());     \
1067         fn(&fn##_nb, (unsigned long)CPU_STARTING,               \
1068                 (void *)(unsigned long)smp_processor_id());     \
1069         fn(&fn##_nb, (unsigned long)CPU_ONLINE,                 \
1070                 (void *)(unsigned long)smp_processor_id());     \
1071         register_cpu_notifier(&fn##_nb);                        \
1072 } while (0)
1073
1074 #endif /* __KERNEL__ */
1075 #endif /* _LINUX_PERF_EVENT_H */