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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                                 precise        :  1, /* OoO invariant counter */
 207
 208                                 __reserved_1   : 48;
 209
 210         union {
 211                 __u32           wakeup_events;    /* wakeup every n events */
 212                 __u32           wakeup_watermark; /* bytes before wakeup   */
 213         };
 214
 215         __u32                   bp_type;
 216         __u64                   bp_addr;
 217         __u64                   bp_len;
 218 };
 219
 220 /*
 221  * Ioctls that can be done on a perf event fd:
 222  */
 223 #define PERF_EVENT_IOC_ENABLE           _IO ('$', 0)
 224 #define PERF_EVENT_IOC_DISABLE          _IO ('$', 1)
 225 #define PERF_EVENT_IOC_REFRESH          _IO ('$', 2)
 226 #define PERF_EVENT_IOC_RESET            _IO ('$', 3)
 227 #define PERF_EVENT_IOC_PERIOD           _IOW('$', 4, __u64)
 228 #define PERF_EVENT_IOC_SET_OUTPUT       _IO ('$', 5)
 229 #define PERF_EVENT_IOC_SET_FILTER       _IOW('$', 6, char *)
 230
 231 enum perf_event_ioc_flags {
 232         PERF_IOC_FLAG_GROUP             = 1U << 0,
 233 };
 234
 235 /*
 236  * Structure of the page that can be mapped via mmap
 237  */
 238 struct perf_event_mmap_page {
 239         __u32   version;                /* version number of this structure */
 240         __u32   compat_version;         /* lowest version this is compat with */
 241
 242         /*
 243          * Bits needed to read the hw events in user-space.
 244          *
 245          *   u32 seq;
 246          *   s64 count;
 247          *
 248          *   do {
 249          *     seq = pc->lock;
 250          *
 251          *     barrier()
 252          *     if (pc->index) {
 253          *       count = pmc_read(pc->index - 1);
 254          *       count += pc->offset;
 255          *     } else
 256          *       goto regular_read;
 257          *
 258          *     barrier();
 259          *   } while (pc->lock != seq);
 260          *
 261          * NOTE: for obvious reason this only works on self-monitoring
 262          *       processes.
 263          */
 264         __u32   lock;                   /* seqlock for synchronization */
 265         __u32   index;                  /* hardware event identifier */
 266         __s64   offset;                 /* add to hardware event value */
 267         __u64   time_enabled;           /* time event active */
 268         __u64   time_running;           /* time event on cpu */
 269
 270                 /*
 271                  * Hole for extension of the self monitor capabilities
 272                  */
 273
 274         __u64   __reserved[123];        /* align to 1k */
 275
 276         /*
 277          * Control data for the mmap() data buffer.
 278          *
 279          * User-space reading the @data_head value should issue an rmb(), on
 280          * SMP capable platforms, after reading this value -- see
 281          * perf_event_wakeup().
 282          *
 283          * When the mapping is PROT_WRITE the @data_tail value should be
 284          * written by userspace to reflect the last read data. In this case
 285          * the kernel will not over-write unread data.
 286          */
 287         __u64   data_head;              /* head in the data section */
 288         __u64   data_tail;              /* user-space written tail */
 289 };
 290
 291 #define PERF_RECORD_MISC_CPUMODE_MASK           (7 << 0)
 292 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN        (0 << 0)
 293 #define PERF_RECORD_MISC_KERNEL                 (1 << 0)
 294 #define PERF_RECORD_MISC_USER                   (2 << 0)
 295 #define PERF_RECORD_MISC_HYPERVISOR             (3 << 0)
 296 #define PERF_RECORD_MISC_GUEST_KERNEL           (4 << 0)
 297 #define PERF_RECORD_MISC_GUEST_USER             (5 << 0)
 298
 299 #define PERF_RECORD_MISC_EXACT                  (1 << 14)
 300 /*
 301  * Reserve the last bit to indicate some extended misc field
 302  */
 303 #define PERF_RECORD_MISC_EXT_RESERVED           (1 << 15)
 304
 305 struct perf_event_header {
 306         __u32   type;
 307         __u16   misc;
 308         __u16   size;
 309 };
 310
 311 enum perf_event_type {
 312
 313         /*
 314          * The MMAP events record the PROT_EXEC mappings so that we can
 315          * correlate userspace IPs to code. They have the following structure:
 316          *
 317          * struct {
 318          *      struct perf_event_header        header;
 319          *
 320          *      u32                             pid, tid;
 321          *      u64                             addr;
 322          *      u64                             len;
 323          *      u64                             pgoff;
 324          *      char                            filename[];
 325          * };
 326          */
 327         PERF_RECORD_MMAP                        = 1,
 328
 329         /*
 330          * struct {
 331          *      struct perf_event_header        header;
 332          *      u64                             id;
 333          *      u64                             lost;
 334          * };
 335          */
 336         PERF_RECORD_LOST                        = 2,
 337
 338         /*
 339          * struct {
 340          *      struct perf_event_header        header;
 341          *
 342          *      u32                             pid, tid;
 343          *      char                            comm[];
 344          * };
 345          */
 346         PERF_RECORD_COMM                        = 3,
 347
 348         /*
 349          * struct {
 350          *      struct perf_event_header        header;
 351          *      u32                             pid, ppid;
 352          *      u32                             tid, ptid;
 353          *      u64                             time;
 354          * };
 355          */
 356         PERF_RECORD_EXIT                        = 4,
 357
 358         /*
 359          * struct {
 360          *      struct perf_event_header        header;
 361          *      u64                             time;
 362          *      u64                             id;
 363          *      u64                             stream_id;
 364          * };
 365          */
 366         PERF_RECORD_THROTTLE                    = 5,
 367         PERF_RECORD_UNTHROTTLE                  = 6,
 368
 369         /*
 370          * struct {
 371          *      struct perf_event_header        header;
 372          *      u32                             pid, ppid;
 373          *      u32                             tid, ptid;
 374          *      u64                             time;
 375          * };
 376          */
 377         PERF_RECORD_FORK                        = 7,
 378
 379         /*
 380          * struct {
 381          *      struct perf_event_header        header;
 382          *      u32                             pid, tid;
 383          *
 384          *      struct read_format              values;
 385          * };
 386          */
 387         PERF_RECORD_READ                        = 8,
 388
 389         /*
 390          * struct {
 391          *      struct perf_event_header        header;
 392          *
 393          *      { u64                   ip;       } && PERF_SAMPLE_IP
 394          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
 395          *      { u64                   time;     } && PERF_SAMPLE_TIME
 396          *      { u64                   addr;     } && PERF_SAMPLE_ADDR
 397          *      { u64                   id;       } && PERF_SAMPLE_ID
 398          *      { u64                   stream_id;} && PERF_SAMPLE_STREAM_ID
 399          *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
 400          *      { u64                   period;   } && PERF_SAMPLE_PERIOD
 401          *
 402          *      { struct read_format    values;   } && PERF_SAMPLE_READ
 403          *
 404          *      { u64                   nr,
 405          *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
 406          *
 407          *      #
 408          *      # The RAW record below is opaque data wrt the ABI
 409          *      #
 410          *      # That is, the ABI doesn't make any promises wrt to
 411          *      # the stability of its content, it may vary depending
 412          *      # on event, hardware, kernel version and phase of
 413          *      # the moon.
 414          *      #
 415          *      # In other words, PERF_SAMPLE_RAW contents are not an ABI.
 416          *      #
 417          *
 418          *      { u32                   size;
 419          *        char                  data[size];}&& PERF_SAMPLE_RAW
 420          * };
 421          */
 422         PERF_RECORD_SAMPLE                      = 9,
 423
 424         PERF_RECORD_MAX,                        /* non-ABI */
 425 };
 426
 427 enum perf_callchain_context {
 428         PERF_CONTEXT_HV                 = (__u64)-32,
 429         PERF_CONTEXT_KERNEL             = (__u64)-128,
 430         PERF_CONTEXT_USER               = (__u64)-512,
 431
 432         PERF_CONTEXT_GUEST              = (__u64)-2048,
 433         PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
 434         PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
 435
 436         PERF_CONTEXT_MAX                = (__u64)-4095,
 437 };
 438
 439 #define PERF_FLAG_FD_NO_GROUP   (1U << 0)
 440 #define PERF_FLAG_FD_OUTPUT     (1U << 1)
 441
 442 #ifdef __KERNEL__
 443 /*
 444  * Kernel-internal data types and definitions:
 445  */
 446
 447 #ifdef CONFIG_PERF_EVENTS
 448 # include <asm/perf_event.h>
 449 #endif
 450
 451 struct perf_guest_info_callbacks {
 452         int (*is_in_guest) (void);
 453         int (*is_user_mode) (void);
 454         unsigned long (*get_guest_ip) (void);
 455 };
 456
 457 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 458 #include <asm/hw_breakpoint.h>
 459 #endif
 460
 461 #include <linux/list.h>
 462 #include <linux/mutex.h>
 463 #include <linux/rculist.h>
 464 #include <linux/rcupdate.h>
 465 #include <linux/spinlock.h>
 466 #include <linux/hrtimer.h>
 467 #include <linux/fs.h>
 468 #include <linux/pid_namespace.h>
 469 #include <linux/workqueue.h>
 470 #include <linux/ftrace.h>
 471 #include <linux/cpu.h>
 472 #include <asm/atomic.h>
 473
 474 #define PERF_MAX_STACK_DEPTH            255
 475
 476 struct perf_callchain_entry {
 477         __u64                           nr;
 478         __u64                           ip[PERF_MAX_STACK_DEPTH];
 479 };
 480
 481 struct perf_raw_record {
 482         u32                             size;
 483         void                            *data;
 484 };
 485
 486 struct perf_branch_entry {
 487         __u64                           from;
 488         __u64                           to;
 489         __u64                           flags;
 490 };
 491
 492 struct perf_branch_stack {
 493         __u64                           nr;
 494         struct perf_branch_entry        entries[0];
 495 };
 496
 497 struct task_struct;
 498
 499 /**
 500  * struct hw_perf_event - performance event hardware details:
 501  */
 502 struct hw_perf_event {
 503 #ifdef CONFIG_PERF_EVENTS
 504         union {
 505                 struct { /* hardware */
 506                         u64             config;
 507                         u64             last_tag;
 508                         unsigned long   config_base;
 509                         unsigned long   event_base;
 510                         int             idx;
 511                         int             last_cpu;
 512                 };
 513                 struct { /* software */
 514                         s64             remaining;
 515                         struct hrtimer  hrtimer;
 516                 };
 517 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 518                 /* breakpoint */
 519                 struct arch_hw_breakpoint       info;
 520 #endif
 521         };
 522         atomic64_t                      prev_count;
 523         u64                             sample_period;
 524         u64                             last_period;
 525         atomic64_t                      period_left;
 526         u64                             interrupts;
 527
 528         u64                             freq_time_stamp;
 529         u64                             freq_count_stamp;
 530 #endif
 531 };
 532
 533 struct perf_event;
 534
 535 /**
 536  * struct pmu - generic performance monitoring unit
 537  */
 538 struct pmu {
 539         int (*enable)                   (struct perf_event *event);
 540         void (*disable)                 (struct perf_event *event);
 541         int (*start)                    (struct perf_event *event);
 542         void (*stop)                    (struct perf_event *event);
 543         void (*read)                    (struct perf_event *event);
 544         void (*unthrottle)              (struct perf_event *event);
 545 };
 546
 547 /**
 548  * enum perf_event_active_state - the states of a event
 549  */
 550 enum perf_event_active_state {
 551         PERF_EVENT_STATE_FREE           = -3,
 552         PERF_EVENT_STATE_ERROR          = -2,
 553         PERF_EVENT_STATE_OFF            = -1,
 554         PERF_EVENT_STATE_INACTIVE       =  0,
 555         PERF_EVENT_STATE_ACTIVE         =  1,
 556 };
 557
 558 struct file;
 559
 560 struct perf_mmap_data {
 561         struct rcu_head                 rcu_head;
 562 #ifdef CONFIG_PERF_USE_VMALLOC
 563         struct work_struct              work;
 564 #endif
 565         int                             data_order;
 566         int                             nr_pages;       /* nr of data pages  */
 567         int                             writable;       /* are we writable   */
 568         int                             nr_locked;      /* nr pages mlocked  */
 569
 570         atomic_t                        poll;           /* POLL_ for wakeups */
 571         atomic_t                        events;         /* event_id limit       */
 572
 573         atomic_long_t                   head;           /* write position    */
 574         atomic_long_t                   done_head;      /* completed head    */
 575
 576         atomic_t                        lock;           /* concurrent writes */
 577         atomic_t                        wakeup;         /* needs a wakeup    */
 578         atomic_t                        lost;           /* nr records lost   */
 579
 580         long                            watermark;      /* wakeup watermark  */
 581
 582         struct perf_event_mmap_page     *user_page;
 583         void                            *data_pages[0];
 584 };
 585
 586 struct perf_pending_entry {
 587         struct perf_pending_entry *next;
 588         void (*func)(struct perf_pending_entry *);
 589 };
 590
 591 struct perf_sample_data;
 592
 593 typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
 594                                         struct perf_sample_data *,
 595                                         struct pt_regs *regs);
 596
 597 enum perf_group_flag {
 598         PERF_GROUP_SOFTWARE = 0x1,
 599 };
 600
 601 #define SWEVENT_HLIST_BITS      8
 602 #define SWEVENT_HLIST_SIZE      (1 << SWEVENT_HLIST_BITS)
 603
 604 struct swevent_hlist {
 605         struct hlist_head       heads[SWEVENT_HLIST_SIZE];
 606         struct rcu_head         rcu_head;
 607 };
 608
 609 /**
 610  * struct perf_event - performance event kernel representation:
 611  */
 612 struct perf_event {
 613 #ifdef CONFIG_PERF_EVENTS
 614         struct list_head                group_entry;
 615         struct list_head                event_entry;
 616         struct list_head                sibling_list;
 617         struct hlist_node               hlist_entry;
 618         int                             nr_siblings;
 619         int                             group_flags;
 620         struct perf_event               *group_leader;
 621         struct perf_event               *output;
 622         const struct pmu                *pmu;
 623
 624         enum perf_event_active_state    state;
 625         atomic64_t                      count;
 626
 627         /*
 628          * These are the total time in nanoseconds that the event
 629          * has been enabled (i.e. eligible to run, and the task has
 630          * been scheduled in, if this is a per-task event)
 631          * and running (scheduled onto the CPU), respectively.
 632          *
 633          * They are computed from tstamp_enabled, tstamp_running and
 634          * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
 635          */
 636         u64                             total_time_enabled;
 637         u64                             total_time_running;
 638
 639         /*
 640          * These are timestamps used for computing total_time_enabled
 641          * and total_time_running when the event is in INACTIVE or
 642          * ACTIVE state, measured in nanoseconds from an arbitrary point
 643          * in time.
 644          * tstamp_enabled: the notional time when the event was enabled
 645          * tstamp_running: the notional time when the event was scheduled on
 646          * tstamp_stopped: in INACTIVE state, the notional time when the
 647          *      event was scheduled off.
 648          */
 649         u64                             tstamp_enabled;
 650         u64                             tstamp_running;
 651         u64                             tstamp_stopped;
 652
 653         struct perf_event_attr          attr;
 654         struct hw_perf_event            hw;
 655
 656         struct perf_event_context       *ctx;
 657         struct file                     *filp;
 658
 659         /*
 660          * These accumulate total time (in nanoseconds) that children
 661          * events have been enabled and running, respectively.
 662          */
 663         atomic64_t                      child_total_time_enabled;
 664         atomic64_t                      child_total_time_running;
 665
 666         /*
 667          * Protect attach/detach and child_list:
 668          */
 669         struct mutex                    child_mutex;
 670         struct list_head                child_list;
 671         struct perf_event               *parent;
 672
 673         int                             oncpu;
 674         int                             cpu;
 675
 676         struct list_head                owner_entry;
 677         struct task_struct              *owner;
 678
 679         /* mmap bits */
 680         struct mutex                    mmap_mutex;
 681         atomic_t                        mmap_count;
 682         struct perf_mmap_data           *data;
 683
 684         /* poll related */
 685         wait_queue_head_t               waitq;
 686         struct fasync_struct            *fasync;
 687
 688         /* delayed work for NMIs and such */
 689         int                             pending_wakeup;
 690         int                             pending_kill;
 691         int                             pending_disable;
 692         struct perf_pending_entry       pending;
 693
 694         atomic_t                        event_limit;
 695
 696         void (*destroy)(struct perf_event *);
 697         struct rcu_head                 rcu_head;
 698
 699         struct pid_namespace            *ns;
 700         u64                             id;
 701
 702         perf_overflow_handler_t         overflow_handler;
 703
 704 #ifdef CONFIG_EVENT_TRACING
 705         struct event_filter             *filter;
 706 #endif
 707
 708 #endif /* CONFIG_PERF_EVENTS */
 709 };
 710
 711 /**
 712  * struct perf_event_context - event context structure
 713  *
 714  * Used as a container for task events and CPU events as well:
 715  */
 716 struct perf_event_context {
 717         /*
 718          * Protect the states of the events in the list,
 719          * nr_active, and the list:
 720          */
 721         raw_spinlock_t                  lock;
 722         /*
 723          * Protect the list of events.  Locking either mutex or lock
 724          * is sufficient to ensure the list doesn't change; to change
 725          * the list you need to lock both the mutex and the spinlock.
 726          */
 727         struct mutex                    mutex;
 728
 729         struct list_head                pinned_groups;
 730         struct list_head                flexible_groups;
 731         struct list_head                event_list;
 732         int                             nr_events;
 733         int                             nr_active;
 734         int                             is_active;
 735         int                             nr_stat;
 736         atomic_t                        refcount;
 737         struct task_struct              *task;
 738
 739         /*
 740          * Context clock, runs when context enabled.
 741          */
 742         u64                             time;
 743         u64                             timestamp;
 744
 745         /*
 746          * These fields let us detect when two contexts have both
 747          * been cloned (inherited) from a common ancestor.
 748          */
 749         struct perf_event_context       *parent_ctx;
 750         u64                             parent_gen;
 751         u64                             generation;
 752         int                             pin_count;
 753         struct rcu_head                 rcu_head;
 754 };
 755
 756 /**
 757  * struct perf_event_cpu_context - per cpu event context structure
 758  */
 759 struct perf_cpu_context {
 760         struct perf_event_context       ctx;
 761         struct perf_event_context       *task_ctx;
 762         int                             active_oncpu;
 763         int                             max_pertask;
 764         int                             exclusive;
 765         struct swevent_hlist            *swevent_hlist;
 766         struct mutex                    hlist_mutex;
 767         int                             hlist_refcount;
 768
 769         /*
 770          * Recursion avoidance:
 771          *
 772          * task, softirq, irq, nmi context
 773          */
 774         int                             recursion[4];
 775 };
 776
 777 struct perf_output_handle {
 778         struct perf_event               *event;
 779         struct perf_mmap_data           *data;
 780         unsigned long                   head;
 781         unsigned long                   offset;
 782         int                             nmi;
 783         int                             sample;
 784         int                             locked;
 785 };
 786
 787 #ifdef CONFIG_PERF_EVENTS
 788
 789 /*
 790  * Set by architecture code:
 791  */
 792 extern int perf_max_events;
 793
 794 extern const struct pmu *hw_perf_event_init(struct perf_event *event);
 795
 796 extern void perf_event_task_sched_in(struct task_struct *task);
 797 extern void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
 798 extern void perf_event_task_tick(struct task_struct *task);
 799 extern int perf_event_init_task(struct task_struct *child);
 800 extern void perf_event_exit_task(struct task_struct *child);
 801 extern void perf_event_free_task(struct task_struct *task);
 802 extern void set_perf_event_pending(void);
 803 extern void perf_event_do_pending(void);
 804 extern void perf_event_print_debug(void);
 805 extern void __perf_disable(void);
 806 extern bool __perf_enable(void);
 807 extern void perf_disable(void);
 808 extern void perf_enable(void);
 809 extern int perf_event_task_disable(void);
 810 extern int perf_event_task_enable(void);
 811 extern int hw_perf_group_sched_in(struct perf_event *group_leader,
 812                struct perf_cpu_context *cpuctx,
 813                struct perf_event_context *ctx);
 814 extern void perf_event_update_userpage(struct perf_event *event);
 815 extern int perf_event_release_kernel(struct perf_event *event);
 816 extern struct perf_event *
 817 perf_event_create_kernel_counter(struct perf_event_attr *attr,
 818                                 int cpu,
 819                                 pid_t pid,
 820                                 perf_overflow_handler_t callback);
 821 extern u64 perf_event_read_value(struct perf_event *event,
 822                                  u64 *enabled, u64 *running);
 823
 824 struct perf_sample_data {
 825         u64                             type;
 826
 827         u64                             ip;
 828         struct {
 829                 u32     pid;
 830                 u32     tid;
 831         }                               tid_entry;
 832         u64                             time;
 833         u64                             addr;
 834         u64                             id;
 835         u64                             stream_id;
 836         struct {
 837                 u32     cpu;
 838                 u32     reserved;
 839         }                               cpu_entry;
 840         u64                             period;
 841         struct perf_callchain_entry     *callchain;
 842         struct perf_raw_record          *raw;
 843 };
 844
 845 static inline
 846 void perf_sample_data_init(struct perf_sample_data *data, u64 addr)
 847 {
 848         data->addr = addr;
 849         data->raw  = NULL;
 850 }
 851
 852 extern void perf_output_sample(struct perf_output_handle *handle,
 853                                struct perf_event_header *header,
 854                                struct perf_sample_data *data,
 855                                struct perf_event *event);
 856 extern void perf_prepare_sample(struct perf_event_header *header,
 857                                 struct perf_sample_data *data,
 858                                 struct perf_event *event,
 859                                 struct pt_regs *regs);
 860
 861 extern int perf_event_overflow(struct perf_event *event, int nmi,
 862                                  struct perf_sample_data *data,
 863                                  struct pt_regs *regs);
 864
 865 /*
 866  * Return 1 for a software event, 0 for a hardware event
 867  */
 868 static inline int is_software_event(struct perf_event *event)
 869 {
 870         switch (event->attr.type) {
 871         case PERF_TYPE_SOFTWARE:
 872         case PERF_TYPE_TRACEPOINT:
 873         /* for now the breakpoint stuff also works as software event */
 874         case PERF_TYPE_BREAKPOINT:
 875                 return 1;
 876         }
 877         return 0;
 878 }
 879
 880 extern atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX];
 881
 882 extern void __perf_sw_event(u32, u64, int, struct pt_regs *, u64);
 883
 884 extern void
 885 perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip);
 886
 887 /*
 888  * Take a snapshot of the regs. Skip ip and frame pointer to
 889  * the nth caller. We only need a few of the regs:
 890  * - ip for PERF_SAMPLE_IP
 891  * - cs for user_mode() tests
 892  * - bp for callchains
 893  * - eflags, for future purposes, just in case
 894  */
 895 static inline void perf_fetch_caller_regs(struct pt_regs *regs, int skip)
 896 {
 897         unsigned long ip;
 898
 899         memset(regs, 0, sizeof(*regs));
 900
 901         switch (skip) {
 902         case 1 :
 903                 ip = CALLER_ADDR0;
 904                 break;
 905         case 2 :
 906                 ip = CALLER_ADDR1;
 907                 break;
 908         case 3 :
 909                 ip = CALLER_ADDR2;
 910                 break;
 911         case 4:
 912                 ip = CALLER_ADDR3;
 913                 break;
 914         /* No need to support further for now */
 915         default:
 916                 ip = 0;
 917         }
 918
 919         return perf_arch_fetch_caller_regs(regs, ip, skip);
 920 }
 921
 922 static inline void
 923 perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
 924 {
 925         if (atomic_read(&perf_swevent_enabled[event_id])) {
 926                 struct pt_regs hot_regs;
 927
 928                 if (!regs) {
 929                         perf_fetch_caller_regs(&hot_regs, 1);
 930                         regs = &hot_regs;
 931                 }
 932                 __perf_sw_event(event_id, nr, nmi, regs, addr);
 933         }
 934 }
 935
 936 extern void __perf_event_mmap(struct vm_area_struct *vma);
 937
 938 static inline void perf_event_mmap(struct vm_area_struct *vma)
 939 {
 940         if (vma->vm_flags & VM_EXEC)
 941                 __perf_event_mmap(vma);
 942 }
 943
 944 extern struct perf_guest_info_callbacks *perf_guest_cbs;
 945 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 946 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 947
 948 extern void perf_event_comm(struct task_struct *tsk);
 949 extern void perf_event_fork(struct task_struct *tsk);
 950
 951 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 952
 953 extern int sysctl_perf_event_paranoid;
 954 extern int sysctl_perf_event_mlock;
 955 extern int sysctl_perf_event_sample_rate;
 956
 957 static inline bool perf_paranoid_tracepoint_raw(void)
 958 {
 959         return sysctl_perf_event_paranoid > -1;
 960 }
 961
 962 static inline bool perf_paranoid_cpu(void)
 963 {
 964         return sysctl_perf_event_paranoid > 0;
 965 }
 966
 967 static inline bool perf_paranoid_kernel(void)
 968 {
 969         return sysctl_perf_event_paranoid > 1;
 970 }
 971
 972 extern void perf_event_init(void);
 973 extern void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
 974                           int entry_size, struct pt_regs *regs);
 975 extern void perf_bp_event(struct perf_event *event, void *data);
 976
 977 #ifndef perf_misc_flags
 978 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_RECORD_MISC_USER : \
 979                                  PERF_RECORD_MISC_KERNEL)
 980 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
 981 #endif
 982
 983 extern int perf_output_begin(struct perf_output_handle *handle,
 984                              struct perf_event *event, unsigned int size,
 985                              int nmi, int sample);
 986 extern void perf_output_end(struct perf_output_handle *handle);
 987 extern void perf_output_copy(struct perf_output_handle *handle,
 988                              const void *buf, unsigned int len);
 989 extern int perf_swevent_get_recursion_context(void);
 990 extern void perf_swevent_put_recursion_context(int rctx);
 991 extern void perf_event_enable(struct perf_event *event);
 992 extern void perf_event_disable(struct perf_event *event);
 993 #else
 994 static inline void
 995 perf_event_task_sched_in(struct task_struct *task)                      { }
 996 static inline void
 997 perf_event_task_sched_out(struct task_struct *task,
 998                             struct task_struct *next)                   { }
 999 static inline void
1000 perf_event_task_tick(struct task_struct *task)                          { }
1001 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
1002 static inline void perf_event_exit_task(struct task_struct *child)      { }
1003 static inline void perf_event_free_task(struct task_struct *task)       { }
1004 static inline void perf_event_do_pending(void)                          { }
1005 static inline void perf_event_print_debug(void)                         { }
1006 static inline void perf_disable(void)                                   { }
1007 static inline void perf_enable(void)                                    { }
1008 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
1009 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
1010
1011 static inline void
1012 perf_sw_event(u32 event_id, u64 nr, int nmi,
1013                      struct pt_regs *regs, u64 addr)                    { }
1014 static inline void
1015 perf_bp_event(struct perf_event *event, void *data)                     { }
1016
1017 static inline int perf_register_guest_info_callbacks
1018 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1019 static inline int perf_unregister_guest_info_callbacks
1020 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1021
1022 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
1023 static inline void perf_event_comm(struct task_struct *tsk)             { }
1024 static inline void perf_event_fork(struct task_struct *tsk)             { }
1025 static inline void perf_event_init(void)                                { }
1026 static inline int  perf_swevent_get_recursion_context(void)             { return -1; }
1027 static inline void perf_swevent_put_recursion_context(int rctx)         { }
1028 static inline void perf_event_enable(struct perf_event *event)          { }
1029 static inline void perf_event_disable(struct perf_event *event)         { }
1030 #endif
1031
1032 #define perf_output_put(handle, x) \
1033         perf_output_copy((handle), &(x), sizeof(x))
1034
1035 /*
1036  * This has to have a higher priority than migration_notifier in sched.c.
1037  */
1038 #define perf_cpu_notifier(fn)                                   \
1039 do {                                                            \
1040         static struct notifier_block fn##_nb __cpuinitdata =    \
1041                 { .notifier_call = fn, .priority = 20 };        \
1042         fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,             \
1043                 (void *)(unsigned long)smp_processor_id());     \
1044         fn(&fn##_nb, (unsigned long)CPU_STARTING,               \
1045                 (void *)(unsigned long)smp_processor_id());     \
1046         fn(&fn##_nb, (unsigned long)CPU_ONLINE,                 \
1047                 (void *)(unsigned long)smp_processor_id());     \
1048         register_cpu_notifier(&fn##_nb);                        \
1049 } while (0)
1050
1051 #endif /* __KERNEL__ */
1052 #endif /* _LINUX_PERF_EVENT_H */