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         PERF_COUNT_HW_STALLED_CYCLES_FRONTEND   = 7,
  56         PERF_COUNT_HW_STALLED_CYCLES_BACKEND    = 8,
  57
  58         PERF_COUNT_HW_MAX,                      /* non-ABI */
  59 };
  60
  61 /*
  62  * Generalized hardware cache events:
  63  *
  64  *       { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
  65  *       { read, write, prefetch } x
  66  *       { accesses, misses }
  67  */
  68 enum perf_hw_cache_id {
  69         PERF_COUNT_HW_CACHE_L1D                 = 0,
  70         PERF_COUNT_HW_CACHE_L1I                 = 1,
  71         PERF_COUNT_HW_CACHE_LL                  = 2,
  72         PERF_COUNT_HW_CACHE_DTLB                = 3,
  73         PERF_COUNT_HW_CACHE_ITLB                = 4,
  74         PERF_COUNT_HW_CACHE_BPU                 = 5,
  75
  76         PERF_COUNT_HW_CACHE_MAX,                /* non-ABI */
  77 };
  78
  79 enum perf_hw_cache_op_id {
  80         PERF_COUNT_HW_CACHE_OP_READ             = 0,
  81         PERF_COUNT_HW_CACHE_OP_WRITE            = 1,
  82         PERF_COUNT_HW_CACHE_OP_PREFETCH         = 2,
  83
  84         PERF_COUNT_HW_CACHE_OP_MAX,             /* non-ABI */
  85 };
  86
  87 enum perf_hw_cache_op_result_id {
  88         PERF_COUNT_HW_CACHE_RESULT_ACCESS       = 0,
  89         PERF_COUNT_HW_CACHE_RESULT_MISS         = 1,
  90
  91         PERF_COUNT_HW_CACHE_RESULT_MAX,         /* non-ABI */
  92 };
  93
  94 /*
  95  * Special "software" events provided by the kernel, even if the hardware
  96  * does not support performance events. These events measure various
  97  * physical and sw events of the kernel (and allow the profiling of them as
  98  * well):
  99  */
 100 enum perf_sw_ids {
 101         PERF_COUNT_SW_CPU_CLOCK                 = 0,
 102         PERF_COUNT_SW_TASK_CLOCK                = 1,
 103         PERF_COUNT_SW_PAGE_FAULTS               = 2,
 104         PERF_COUNT_SW_CONTEXT_SWITCHES          = 3,
 105         PERF_COUNT_SW_CPU_MIGRATIONS            = 4,
 106         PERF_COUNT_SW_PAGE_FAULTS_MIN           = 5,
 107         PERF_COUNT_SW_PAGE_FAULTS_MAJ           = 6,
 108         PERF_COUNT_SW_ALIGNMENT_FAULTS          = 7,
 109         PERF_COUNT_SW_EMULATION_FAULTS          = 8,
 110
 111         PERF_COUNT_SW_MAX,                      /* non-ABI */
 112 };
 113
 114 /*
 115  * Bits that can be set in attr.sample_type to request information
 116  * in the overflow packets.
 117  */
 118 enum perf_event_sample_format {
 119         PERF_SAMPLE_IP                          = 1U << 0,
 120         PERF_SAMPLE_TID                         = 1U << 1,
 121         PERF_SAMPLE_TIME                        = 1U << 2,
 122         PERF_SAMPLE_ADDR                        = 1U << 3,
 123         PERF_SAMPLE_READ                        = 1U << 4,
 124         PERF_SAMPLE_CALLCHAIN                   = 1U << 5,
 125         PERF_SAMPLE_ID                          = 1U << 6,
 126         PERF_SAMPLE_CPU                         = 1U << 7,
 127         PERF_SAMPLE_PERIOD                      = 1U << 8,
 128         PERF_SAMPLE_STREAM_ID                   = 1U << 9,
 129         PERF_SAMPLE_RAW                         = 1U << 10,
 130
 131         PERF_SAMPLE_MAX = 1U << 11,             /* non-ABI */
 132 };
 133
 134 /*
 135  * The format of the data returned by read() on a perf event fd,
 136  * as specified by attr.read_format:
 137  *
 138  * struct read_format {
 139  *      { u64           value;
 140  *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
 141  *        { u64         time_running; } && PERF_FORMAT_RUNNING
 142  *        { u64         id;           } && PERF_FORMAT_ID
 143  *      } && !PERF_FORMAT_GROUP
 144  *
 145  *      { u64           nr;
 146  *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
 147  *        { u64         time_running; } && PERF_FORMAT_RUNNING
 148  *        { u64         value;
 149  *          { u64       id;           } && PERF_FORMAT_ID
 150  *        }             cntr[nr];
 151  *      } && PERF_FORMAT_GROUP
 152  * };
 153  */
 154 enum perf_event_read_format {
 155         PERF_FORMAT_TOTAL_TIME_ENABLED          = 1U << 0,
 156         PERF_FORMAT_TOTAL_TIME_RUNNING          = 1U << 1,
 157         PERF_FORMAT_ID                          = 1U << 2,
 158         PERF_FORMAT_GROUP                       = 1U << 3,
 159
 160         PERF_FORMAT_MAX = 1U << 4,              /* non-ABI */
 161 };
 162
 163 #define PERF_ATTR_SIZE_VER0     64      /* sizeof first published struct */
 164
 165 /*
 166  * Hardware event_id to monitor via a performance monitoring event:
 167  */
 168 struct perf_event_attr {
 169
 170         /*
 171          * Major type: hardware/software/tracepoint/etc.
 172          */
 173         __u32                   type;
 174
 175         /*
 176          * Size of the attr structure, for fwd/bwd compat.
 177          */
 178         __u32                   size;
 179
 180         /*
 181          * Type specific configuration information.
 182          */
 183         __u64                   config;
 184
 185         union {
 186                 __u64           sample_period;
 187                 __u64           sample_freq;
 188         };
 189
 190         __u64                   sample_type;
 191         __u64                   read_format;
 192
 193         __u64                   disabled       :  1, /* off by default        */
 194                                 inherit        :  1, /* children inherit it   */
 195                                 pinned         :  1, /* must always be on PMU */
 196                                 exclusive      :  1, /* only group on PMU     */
 197                                 exclude_user   :  1, /* don't count user      */
 198                                 exclude_kernel :  1, /* ditto kernel          */
 199                                 exclude_hv     :  1, /* ditto hypervisor      */
 200                                 exclude_idle   :  1, /* don't count when idle */
 201                                 mmap           :  1, /* include mmap data     */
 202                                 comm           :  1, /* include comm data     */
 203                                 freq           :  1, /* use freq, not period  */
 204                                 inherit_stat   :  1, /* per task counts       */
 205                                 enable_on_exec :  1, /* next exec enables     */
 206                                 task           :  1, /* trace fork/exit       */
 207                                 watermark      :  1, /* wakeup_watermark      */
 208                                 /*
 209                                  * precise_ip:
 210                                  *
 211                                  *  0 - SAMPLE_IP can have arbitrary skid
 212                                  *  1 - SAMPLE_IP must have constant skid
 213                                  *  2 - SAMPLE_IP requested to have 0 skid
 214                                  *  3 - SAMPLE_IP must have 0 skid
 215                                  *
 216                                  *  See also PERF_RECORD_MISC_EXACT_IP
 217                                  */
 218                                 precise_ip     :  2, /* skid constraint       */
 219                                 mmap_data      :  1, /* non-exec mmap data    */
 220                                 sample_id_all  :  1, /* sample_type all events */
 221
 222                                 __reserved_1   : 45;
 223
 224         union {
 225                 __u32           wakeup_events;    /* wakeup every n events */
 226                 __u32           wakeup_watermark; /* bytes before wakeup   */
 227         };
 228
 229         __u32                   bp_type;
 230         union {
 231                 __u64           bp_addr;
 232                 __u64           config1; /* extension of config */
 233         };
 234         union {
 235                 __u64           bp_len;
 236                 __u64           config2; /* extension of config1 */
 237         };
 238 };
 239
 240 /*
 241  * Ioctls that can be done on a perf event fd:
 242  */
 243 #define PERF_EVENT_IOC_ENABLE           _IO ('$', 0)
 244 #define PERF_EVENT_IOC_DISABLE          _IO ('$', 1)
 245 #define PERF_EVENT_IOC_REFRESH          _IO ('$', 2)
 246 #define PERF_EVENT_IOC_RESET            _IO ('$', 3)
 247 #define PERF_EVENT_IOC_PERIOD           _IOW('$', 4, __u64)
 248 #define PERF_EVENT_IOC_SET_OUTPUT       _IO ('$', 5)
 249 #define PERF_EVENT_IOC_SET_FILTER       _IOW('$', 6, char *)
 250
 251 enum perf_event_ioc_flags {
 252         PERF_IOC_FLAG_GROUP             = 1U << 0,
 253 };
 254
 255 /*
 256  * Structure of the page that can be mapped via mmap
 257  */
 258 struct perf_event_mmap_page {
 259         __u32   version;                /* version number of this structure */
 260         __u32   compat_version;         /* lowest version this is compat with */
 261
 262         /*
 263          * Bits needed to read the hw events in user-space.
 264          *
 265          *   u32 seq;
 266          *   s64 count;
 267          *
 268          *   do {
 269          *     seq = pc->lock;
 270          *
 271          *     barrier()
 272          *     if (pc->index) {
 273          *       count = pmc_read(pc->index - 1);
 274          *       count += pc->offset;
 275          *     } else
 276          *       goto regular_read;
 277          *
 278          *     barrier();
 279          *   } while (pc->lock != seq);
 280          *
 281          * NOTE: for obvious reason this only works on self-monitoring
 282          *       processes.
 283          */
 284         __u32   lock;                   /* seqlock for synchronization */
 285         __u32   index;                  /* hardware event identifier */
 286         __s64   offset;                 /* add to hardware event value */
 287         __u64   time_enabled;           /* time event active */
 288         __u64   time_running;           /* time event on cpu */
 289
 290                 /*
 291                  * Hole for extension of the self monitor capabilities
 292                  */
 293
 294         __u64   __reserved[123];        /* align to 1k */
 295
 296         /*
 297          * Control data for the mmap() data buffer.
 298          *
 299          * User-space reading the @data_head value should issue an rmb(), on
 300          * SMP capable platforms, after reading this value -- see
 301          * perf_event_wakeup().
 302          *
 303          * When the mapping is PROT_WRITE the @data_tail value should be
 304          * written by userspace to reflect the last read data. In this case
 305          * the kernel will not over-write unread data.
 306          */
 307         __u64   data_head;              /* head in the data section */
 308         __u64   data_tail;              /* user-space written tail */
 309 };
 310
 311 #define PERF_RECORD_MISC_CPUMODE_MASK           (7 << 0)
 312 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN        (0 << 0)
 313 #define PERF_RECORD_MISC_KERNEL                 (1 << 0)
 314 #define PERF_RECORD_MISC_USER                   (2 << 0)
 315 #define PERF_RECORD_MISC_HYPERVISOR             (3 << 0)
 316 #define PERF_RECORD_MISC_GUEST_KERNEL           (4 << 0)
 317 #define PERF_RECORD_MISC_GUEST_USER             (5 << 0)
 318
 319 /*
 320  * Indicates that the content of PERF_SAMPLE_IP points to
 321  * the actual instruction that triggered the event. See also
 322  * perf_event_attr::precise_ip.
 323  */
 324 #define PERF_RECORD_MISC_EXACT_IP               (1 << 14)
 325 /*
 326  * Reserve the last bit to indicate some extended misc field
 327  */
 328 #define PERF_RECORD_MISC_EXT_RESERVED           (1 << 15)
 329
 330 struct perf_event_header {
 331         __u32   type;
 332         __u16   misc;
 333         __u16   size;
 334 };
 335
 336 enum perf_event_type {
 337
 338         /*
 339          * If perf_event_attr.sample_id_all is set then all event types will
 340          * have the sample_type selected fields related to where/when
 341          * (identity) an event took place (TID, TIME, ID, CPU, STREAM_ID)
 342          * described in PERF_RECORD_SAMPLE below, it will be stashed just after
 343          * the perf_event_header and the fields already present for the existing
 344          * fields, i.e. at the end of the payload. That way a newer perf.data
 345          * file will be supported by older perf tools, with these new optional
 346          * fields being ignored.
 347          *
 348          * The MMAP events record the PROT_EXEC mappings so that we can
 349          * correlate userspace IPs to code. They have the following structure:
 350          *
 351          * struct {
 352          *      struct perf_event_header        header;
 353          *
 354          *      u32                             pid, tid;
 355          *      u64                             addr;
 356          *      u64                             len;
 357          *      u64                             pgoff;
 358          *      char                            filename[];
 359          * };
 360          */
 361         PERF_RECORD_MMAP                        = 1,
 362
 363         /*
 364          * struct {
 365          *      struct perf_event_header        header;
 366          *      u64                             id;
 367          *      u64                             lost;
 368          * };
 369          */
 370         PERF_RECORD_LOST                        = 2,
 371
 372         /*
 373          * struct {
 374          *      struct perf_event_header        header;
 375          *
 376          *      u32                             pid, tid;
 377          *      char                            comm[];
 378          * };
 379          */
 380         PERF_RECORD_COMM                        = 3,
 381
 382         /*
 383          * struct {
 384          *      struct perf_event_header        header;
 385          *      u32                             pid, ppid;
 386          *      u32                             tid, ptid;
 387          *      u64                             time;
 388          * };
 389          */
 390         PERF_RECORD_EXIT                        = 4,
 391
 392         /*
 393          * struct {
 394          *      struct perf_event_header        header;
 395          *      u64                             time;
 396          *      u64                             id;
 397          *      u64                             stream_id;
 398          * };
 399          */
 400         PERF_RECORD_THROTTLE                    = 5,
 401         PERF_RECORD_UNTHROTTLE                  = 6,
 402
 403         /*
 404          * struct {
 405          *      struct perf_event_header        header;
 406          *      u32                             pid, ppid;
 407          *      u32                             tid, ptid;
 408          *      u64                             time;
 409          * };
 410          */
 411         PERF_RECORD_FORK                        = 7,
 412
 413         /*
 414          * struct {
 415          *      struct perf_event_header        header;
 416          *      u32                             pid, tid;
 417          *
 418          *      struct read_format              values;
 419          * };
 420          */
 421         PERF_RECORD_READ                        = 8,
 422
 423         /*
 424          * struct {
 425          *      struct perf_event_header        header;
 426          *
 427          *      { u64                   ip;       } && PERF_SAMPLE_IP
 428          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
 429          *      { u64                   time;     } && PERF_SAMPLE_TIME
 430          *      { u64                   addr;     } && PERF_SAMPLE_ADDR
 431          *      { u64                   id;       } && PERF_SAMPLE_ID
 432          *      { u64                   stream_id;} && PERF_SAMPLE_STREAM_ID
 433          *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
 434          *      { u64                   period;   } && PERF_SAMPLE_PERIOD
 435          *
 436          *      { struct read_format    values;   } && PERF_SAMPLE_READ
 437          *
 438          *      { u64                   nr,
 439          *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
 440          *
 441          *      #
 442          *      # The RAW record below is opaque data wrt the ABI
 443          *      #
 444          *      # That is, the ABI doesn't make any promises wrt to
 445          *      # the stability of its content, it may vary depending
 446          *      # on event, hardware, kernel version and phase of
 447          *      # the moon.
 448          *      #
 449          *      # In other words, PERF_SAMPLE_RAW contents are not an ABI.
 450          *      #
 451          *
 452          *      { u32                   size;
 453          *        char                  data[size];}&& PERF_SAMPLE_RAW
 454          * };
 455          */
 456         PERF_RECORD_SAMPLE                      = 9,
 457
 458         PERF_RECORD_MAX,                        /* non-ABI */
 459 };
 460
 461 enum perf_callchain_context {
 462         PERF_CONTEXT_HV                 = (__u64)-32,
 463         PERF_CONTEXT_KERNEL             = (__u64)-128,
 464         PERF_CONTEXT_USER               = (__u64)-512,
 465
 466         PERF_CONTEXT_GUEST              = (__u64)-2048,
 467         PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
 468         PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
 469
 470         PERF_CONTEXT_MAX                = (__u64)-4095,
 471 };
 472
 473 #define PERF_FLAG_FD_NO_GROUP   (1U << 0)
 474 #define PERF_FLAG_FD_OUTPUT     (1U << 1)
 475 #define PERF_FLAG_PID_CGROUP    (1U << 2) /* pid=cgroup id, per-cpu mode only */
 476
 477 #ifdef __KERNEL__
 478 /*
 479  * Kernel-internal data types and definitions:
 480  */
 481
 482 #ifdef CONFIG_PERF_EVENTS
 483 # include <linux/cgroup.h>
 484 # include <asm/perf_event.h>
 485 # include <asm/local64.h>
 486 #endif
 487
 488 struct perf_guest_info_callbacks {
 489         int (*is_in_guest) (void);
 490         int (*is_user_mode) (void);
 491         unsigned long (*get_guest_ip) (void);
 492 };
 493
 494 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 495 #include <asm/hw_breakpoint.h>
 496 #endif
 497
 498 #include <linux/list.h>
 499 #include <linux/mutex.h>
 500 #include <linux/rculist.h>
 501 #include <linux/rcupdate.h>
 502 #include <linux/spinlock.h>
 503 #include <linux/hrtimer.h>
 504 #include <linux/fs.h>
 505 #include <linux/pid_namespace.h>
 506 #include <linux/workqueue.h>
 507 #include <linux/ftrace.h>
 508 #include <linux/cpu.h>
 509 #include <linux/irq_work.h>
 510 #include <linux/jump_label_ref.h>
 511 #include <asm/atomic.h>
 512 #include <asm/local.h>
 513
 514 #define PERF_MAX_STACK_DEPTH            255
 515
 516 struct perf_callchain_entry {
 517         __u64                           nr;
 518         __u64                           ip[PERF_MAX_STACK_DEPTH];
 519 };
 520
 521 struct perf_raw_record {
 522         u32                             size;
 523         void                            *data;
 524 };
 525
 526 struct perf_branch_entry {
 527         __u64                           from;
 528         __u64                           to;
 529         __u64                           flags;
 530 };
 531
 532 struct perf_branch_stack {
 533         __u64                           nr;
 534         struct perf_branch_entry        entries[0];
 535 };
 536
 537 struct task_struct;
 538
 539 /**
 540  * struct hw_perf_event - performance event hardware details:
 541  */
 542 struct hw_perf_event {
 543 #ifdef CONFIG_PERF_EVENTS
 544         union {
 545                 struct { /* hardware */
 546                         u64             config;
 547                         u64             last_tag;
 548                         unsigned long   config_base;
 549                         unsigned long   event_base;
 550                         int             idx;
 551                         int             last_cpu;
 552                         unsigned int    extra_reg;
 553                         u64             extra_config;
 554                         int             extra_alloc;
 555                 };
 556                 struct { /* software */
 557                         struct hrtimer  hrtimer;
 558                 };
 559 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 560                 struct { /* breakpoint */
 561                         struct arch_hw_breakpoint       info;
 562                         struct list_head                bp_list;
 563                         /*
 564                          * Crufty hack to avoid the chicken and egg
 565                          * problem hw_breakpoint has with context
 566                          * creation and event initalization.
 567                          */
 568                         struct task_struct              *bp_target;
 569                 };
 570 #endif
 571         };
 572         int                             state;
 573         local64_t                       prev_count;
 574         u64                             sample_period;
 575         u64                             last_period;
 576         local64_t                       period_left;
 577         u64                             interrupts;
 578
 579         u64                             freq_time_stamp;
 580         u64                             freq_count_stamp;
 581 #endif
 582 };
 583
 584 /*
 585  * hw_perf_event::state flags
 586  */
 587 #define PERF_HES_STOPPED        0x01 /* the counter is stopped */
 588 #define PERF_HES_UPTODATE       0x02 /* event->count up-to-date */
 589 #define PERF_HES_ARCH           0x04
 590
 591 struct perf_event;
 592
 593 /*
 594  * Common implementation detail of pmu::{start,commit,cancel}_txn
 595  */
 596 #define PERF_EVENT_TXN 0x1
 597
 598 /**
 599  * struct pmu - generic performance monitoring unit
 600  */
 601 struct pmu {
 602         struct list_head                entry;
 603
 604         struct device                   *dev;
 605         char                            *name;
 606         int                             type;
 607
 608         int * __percpu                  pmu_disable_count;
 609         struct perf_cpu_context * __percpu pmu_cpu_context;
 610         int                             task_ctx_nr;
 611
 612         /*
 613          * Fully disable/enable this PMU, can be used to protect from the PMI
 614          * as well as for lazy/batch writing of the MSRs.
 615          */
 616         void (*pmu_enable)              (struct pmu *pmu); /* optional */
 617         void (*pmu_disable)             (struct pmu *pmu); /* optional */
 618
 619         /*
 620          * Try and initialize the event for this PMU.
 621          * Should return -ENOENT when the @event doesn't match this PMU.
 622          */
 623         int (*event_init)               (struct perf_event *event);
 624
 625 #define PERF_EF_START   0x01            /* start the counter when adding    */
 626 #define PERF_EF_RELOAD  0x02            /* reload the counter when starting */
 627 #define PERF_EF_UPDATE  0x04            /* update the counter when stopping */
 628
 629         /*
 630          * Adds/Removes a counter to/from the PMU, can be done inside
 631          * a transaction, see the ->*_txn() methods.
 632          */
 633         int  (*add)                     (struct perf_event *event, int flags);
 634         void (*del)                     (struct perf_event *event, int flags);
 635
 636         /*
 637          * Starts/Stops a counter present on the PMU. The PMI handler
 638          * should stop the counter when perf_event_overflow() returns
 639          * !0. ->start() will be used to continue.
 640          */
 641         void (*start)                   (struct perf_event *event, int flags);
 642         void (*stop)                    (struct perf_event *event, int flags);
 643
 644         /*
 645          * Updates the counter value of the event.
 646          */
 647         void (*read)                    (struct perf_event *event);
 648
 649         /*
 650          * Group events scheduling is treated as a transaction, add
 651          * group events as a whole and perform one schedulability test.
 652          * If the test fails, roll back the whole group
 653          *
 654          * Start the transaction, after this ->add() doesn't need to
 655          * do schedulability tests.
 656          */
 657         void (*start_txn)       (struct pmu *pmu); /* optional */
 658         /*
 659          * If ->start_txn() disabled the ->add() schedulability test
 660          * then ->commit_txn() is required to perform one. On success
 661          * the transaction is closed. On error the transaction is kept
 662          * open until ->cancel_txn() is called.
 663          */
 664         int  (*commit_txn)      (struct pmu *pmu); /* optional */
 665         /*
 666          * Will cancel the transaction, assumes ->del() is called
 667          * for each successful ->add() during the transaction.
 668          */
 669         void (*cancel_txn)      (struct pmu *pmu); /* optional */
 670 };
 671
 672 /**
 673  * enum perf_event_active_state - the states of a event
 674  */
 675 enum perf_event_active_state {
 676         PERF_EVENT_STATE_ERROR          = -2,
 677         PERF_EVENT_STATE_OFF            = -1,
 678         PERF_EVENT_STATE_INACTIVE       =  0,
 679         PERF_EVENT_STATE_ACTIVE         =  1,
 680 };
 681
 682 struct file;
 683
 684 #define PERF_BUFFER_WRITABLE            0x01
 685
 686 struct perf_buffer {
 687         atomic_t                        refcount;
 688         struct rcu_head                 rcu_head;
 689 #ifdef CONFIG_PERF_USE_VMALLOC
 690         struct work_struct              work;
 691         int                             page_order;     /* allocation order  */
 692 #endif
 693         int                             nr_pages;       /* nr of data pages  */
 694         int                             writable;       /* are we writable   */
 695
 696         atomic_t                        poll;           /* POLL_ for wakeups */
 697
 698         local_t                         head;           /* write position    */
 699         local_t                         nest;           /* nested writers    */
 700         local_t                         events;         /* event limit       */
 701         local_t                         wakeup;         /* wakeup stamp      */
 702         local_t                         lost;           /* nr records lost   */
 703
 704         long                            watermark;      /* wakeup watermark  */
 705
 706         struct perf_event_mmap_page     *user_page;
 707         void                            *data_pages[0];
 708 };
 709
 710 struct perf_sample_data;
 711
 712 typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
 713                                         struct perf_sample_data *,
 714                                         struct pt_regs *regs);
 715
 716 enum perf_group_flag {
 717         PERF_GROUP_SOFTWARE = 0x1,
 718 };
 719
 720 #define SWEVENT_HLIST_BITS      8
 721 #define SWEVENT_HLIST_SIZE      (1 << SWEVENT_HLIST_BITS)
 722
 723 struct swevent_hlist {
 724         struct hlist_head       heads[SWEVENT_HLIST_SIZE];
 725         struct rcu_head         rcu_head;
 726 };
 727
 728 #define PERF_ATTACH_CONTEXT     0x01
 729 #define PERF_ATTACH_GROUP       0x02
 730 #define PERF_ATTACH_TASK        0x04
 731
 732 #ifdef CONFIG_CGROUP_PERF
 733 /*
 734  * perf_cgroup_info keeps track of time_enabled for a cgroup.
 735  * This is a per-cpu dynamically allocated data structure.
 736  */
 737 struct perf_cgroup_info {
 738         u64 time;
 739         u64 timestamp;
 740 };
 741
 742 struct perf_cgroup {
 743         struct cgroup_subsys_state css;
 744         struct perf_cgroup_info *info;  /* timing info, one per cpu */
 745 };
 746 #endif
 747
 748 /**
 749  * struct perf_event - performance event kernel representation:
 750  */
 751 struct perf_event {
 752 #ifdef CONFIG_PERF_EVENTS
 753         struct list_head                group_entry;
 754         struct list_head                event_entry;
 755         struct list_head                sibling_list;
 756         struct hlist_node               hlist_entry;
 757         int                             nr_siblings;
 758         int                             group_flags;
 759         struct perf_event               *group_leader;
 760         struct pmu                      *pmu;
 761
 762         enum perf_event_active_state    state;
 763         unsigned int                    attach_state;
 764         local64_t                       count;
 765         atomic64_t                      child_count;
 766
 767         /*
 768          * These are the total time in nanoseconds that the event
 769          * has been enabled (i.e. eligible to run, and the task has
 770          * been scheduled in, if this is a per-task event)
 771          * and running (scheduled onto the CPU), respectively.
 772          *
 773          * They are computed from tstamp_enabled, tstamp_running and
 774          * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
 775          */
 776         u64                             total_time_enabled;
 777         u64                             total_time_running;
 778
 779         /*
 780          * These are timestamps used for computing total_time_enabled
 781          * and total_time_running when the event is in INACTIVE or
 782          * ACTIVE state, measured in nanoseconds from an arbitrary point
 783          * in time.
 784          * tstamp_enabled: the notional time when the event was enabled
 785          * tstamp_running: the notional time when the event was scheduled on
 786          * tstamp_stopped: in INACTIVE state, the notional time when the
 787          *      event was scheduled off.
 788          */
 789         u64                             tstamp_enabled;
 790         u64                             tstamp_running;
 791         u64                             tstamp_stopped;
 792
 793         /*
 794          * timestamp shadows the actual context timing but it can
 795          * be safely used in NMI interrupt context. It reflects the
 796          * context time as it was when the event was last scheduled in.
 797          *
 798          * ctx_time already accounts for ctx->timestamp. Therefore to
 799          * compute ctx_time for a sample, simply add perf_clock().
 800          */
 801         u64                             shadow_ctx_time;
 802
 803         struct perf_event_attr          attr;
 804         u16                             header_size;
 805         u16                             id_header_size;
 806         u16                             read_size;
 807         struct hw_perf_event            hw;
 808
 809         struct perf_event_context       *ctx;
 810         struct file                     *filp;
 811
 812         /*
 813          * These accumulate total time (in nanoseconds) that children
 814          * events have been enabled and running, respectively.
 815          */
 816         atomic64_t                      child_total_time_enabled;
 817         atomic64_t                      child_total_time_running;
 818
 819         /*
 820          * Protect attach/detach and child_list:
 821          */
 822         struct mutex                    child_mutex;
 823         struct list_head                child_list;
 824         struct perf_event               *parent;
 825
 826         int                             oncpu;
 827         int                             cpu;
 828
 829         struct list_head                owner_entry;
 830         struct task_struct              *owner;
 831
 832         /* mmap bits */
 833         struct mutex                    mmap_mutex;
 834         atomic_t                        mmap_count;
 835         int                             mmap_locked;
 836         struct user_struct              *mmap_user;
 837         struct perf_buffer              *buffer;
 838
 839         /* poll related */
 840         wait_queue_head_t               waitq;
 841         struct fasync_struct            *fasync;
 842
 843         /* delayed work for NMIs and such */
 844         int                             pending_wakeup;
 845         int                             pending_kill;
 846         int                             pending_disable;
 847         struct irq_work                 pending;
 848
 849         atomic_t                        event_limit;
 850
 851         void (*destroy)(struct perf_event *);
 852         struct rcu_head                 rcu_head;
 853
 854         struct pid_namespace            *ns;
 855         u64                             id;
 856
 857         perf_overflow_handler_t         overflow_handler;
 858
 859 #ifdef CONFIG_EVENT_TRACING
 860         struct ftrace_event_call        *tp_event;
 861         struct event_filter             *filter;
 862 #endif
 863
 864 #ifdef CONFIG_CGROUP_PERF
 865         struct perf_cgroup              *cgrp; /* cgroup event is attach to */
 866         int                             cgrp_defer_enabled;
 867 #endif
 868
 869 #endif /* CONFIG_PERF_EVENTS */
 870 };
 871
 872 enum perf_event_context_type {
 873         task_context,
 874         cpu_context,
 875 };
 876
 877 /**
 878  * struct perf_event_context - event context structure
 879  *
 880  * Used as a container for task events and CPU events as well:
 881  */
 882 struct perf_event_context {
 883         struct pmu                      *pmu;
 884         enum perf_event_context_type    type;
 885         /*
 886          * Protect the states of the events in the list,
 887          * nr_active, and the list:
 888          */
 889         raw_spinlock_t                  lock;
 890         /*
 891          * Protect the list of events.  Locking either mutex or lock
 892          * is sufficient to ensure the list doesn't change; to change
 893          * the list you need to lock both the mutex and the spinlock.
 894          */
 895         struct mutex                    mutex;
 896
 897         struct list_head                pinned_groups;
 898         struct list_head                flexible_groups;
 899         struct list_head                event_list;
 900         int                             nr_events;
 901         int                             nr_active;
 902         int                             is_active;
 903         int                             nr_stat;
 904         int                             rotate_disable;
 905         atomic_t                        refcount;
 906         struct task_struct              *task;
 907
 908         /*
 909          * Context clock, runs when context enabled.
 910          */
 911         u64                             time;
 912         u64                             timestamp;
 913
 914         /*
 915          * These fields let us detect when two contexts have both
 916          * been cloned (inherited) from a common ancestor.
 917          */
 918         struct perf_event_context       *parent_ctx;
 919         u64                             parent_gen;
 920         u64                             generation;
 921         int                             pin_count;
 922         struct rcu_head                 rcu_head;
 923         int                             nr_cgroups; /* cgroup events present */
 924 };
 925
 926 /*
 927  * Number of contexts where an event can trigger:
 928  *      task, softirq, hardirq, nmi.
 929  */
 930 #define PERF_NR_CONTEXTS        4
 931
 932 /**
 933  * struct perf_event_cpu_context - per cpu event context structure
 934  */
 935 struct perf_cpu_context {
 936         struct perf_event_context       ctx;
 937         struct perf_event_context       *task_ctx;
 938         int                             active_oncpu;
 939         int                             exclusive;
 940         struct list_head                rotation_list;
 941         int                             jiffies_interval;
 942         struct pmu                      *active_pmu;
 943         struct perf_cgroup              *cgrp;
 944 };
 945
 946 struct perf_output_handle {
 947         struct perf_event               *event;
 948         struct perf_buffer              *buffer;
 949         unsigned long                   wakeup;
 950         unsigned long                   size;
 951         void                            *addr;
 952         int                             page;
 953         int                             nmi;
 954         int                             sample;
 955 };
 956
 957 #ifdef CONFIG_PERF_EVENTS
 958
 959 extern int perf_pmu_register(struct pmu *pmu, char *name, int type);
 960 extern void perf_pmu_unregister(struct pmu *pmu);
 961
 962 extern int perf_num_counters(void);
 963 extern const char *perf_pmu_name(void);
 964 extern void __perf_event_task_sched_in(struct task_struct *task);
 965 extern void __perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
 966 extern int perf_event_init_task(struct task_struct *child);
 967 extern void perf_event_exit_task(struct task_struct *child);
 968 extern void perf_event_free_task(struct task_struct *task);
 969 extern void perf_event_delayed_put(struct task_struct *task);
 970 extern void perf_event_print_debug(void);
 971 extern void perf_pmu_disable(struct pmu *pmu);
 972 extern void perf_pmu_enable(struct pmu *pmu);
 973 extern int perf_event_task_disable(void);
 974 extern int perf_event_task_enable(void);
 975 extern void perf_event_update_userpage(struct perf_event *event);
 976 extern int perf_event_release_kernel(struct perf_event *event);
 977 extern struct perf_event *
 978 perf_event_create_kernel_counter(struct perf_event_attr *attr,
 979                                 int cpu,
 980                                 struct task_struct *task,
 981                                 perf_overflow_handler_t callback);
 982 extern u64 perf_event_read_value(struct perf_event *event,
 983                                  u64 *enabled, u64 *running);
 984
 985 struct perf_sample_data {
 986         u64                             type;
 987
 988         u64                             ip;
 989         struct {
 990                 u32     pid;
 991                 u32     tid;
 992         }                               tid_entry;
 993         u64                             time;
 994         u64                             addr;
 995         u64                             id;
 996         u64                             stream_id;
 997         struct {
 998                 u32     cpu;
 999                 u32     reserved;
1000         }                               cpu_entry;
1001         u64                             period;
1002         struct perf_callchain_entry     *callchain;
1003         struct perf_raw_record          *raw;
1004 };
1005
1006 static inline
1007 void perf_sample_data_init(struct perf_sample_data *data, u64 addr)
1008 {
1009         data->addr = addr;
1010         data->raw  = NULL;
1011 }
1012
1013 extern void perf_output_sample(struct perf_output_handle *handle,
1014                                struct perf_event_header *header,
1015                                struct perf_sample_data *data,
1016                                struct perf_event *event);
1017 extern void perf_prepare_sample(struct perf_event_header *header,
1018                                 struct perf_sample_data *data,
1019                                 struct perf_event *event,
1020                                 struct pt_regs *regs);
1021
1022 extern int perf_event_overflow(struct perf_event *event, int nmi,
1023                                  struct perf_sample_data *data,
1024                                  struct pt_regs *regs);
1025
1026 static inline bool is_sampling_event(struct perf_event *event)
1027 {
1028         return event->attr.sample_period != 0;
1029 }
1030
1031 /*
1032  * Return 1 for a software event, 0 for a hardware event
1033  */
1034 static inline int is_software_event(struct perf_event *event)
1035 {
1036         return event->pmu->task_ctx_nr == perf_sw_context;
1037 }
1038
1039 extern atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX];
1040
1041 extern void __perf_sw_event(u32, u64, int, struct pt_regs *, u64);
1042
1043 #ifndef perf_arch_fetch_caller_regs
1044 static inline void
1045 perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
1046 #endif
1047
1048 /*
1049  * Take a snapshot of the regs. Skip ip and frame pointer to
1050  * the nth caller. We only need a few of the regs:
1051  * - ip for PERF_SAMPLE_IP
1052  * - cs for user_mode() tests
1053  * - bp for callchains
1054  * - eflags, for future purposes, just in case
1055  */
1056 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
1057 {
1058         memset(regs, 0, sizeof(*regs));
1059
1060         perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
1061 }
1062
1063 static __always_inline void
1064 perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
1065 {
1066         struct pt_regs hot_regs;
1067
1068         JUMP_LABEL(&perf_swevent_enabled[event_id], have_event);
1069         return;
1070
1071 have_event:
1072         if (!regs) {
1073                 perf_fetch_caller_regs(&hot_regs);
1074                 regs = &hot_regs;
1075         }
1076         __perf_sw_event(event_id, nr, nmi, regs, addr);
1077 }
1078
1079 extern atomic_t perf_sched_events;
1080
1081 static inline void perf_event_task_sched_in(struct task_struct *task)
1082 {
1083         COND_STMT(&perf_sched_events, __perf_event_task_sched_in(task));
1084 }
1085
1086 static inline
1087 void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next)
1088 {
1089         perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, NULL, 0);
1090
1091         __perf_event_task_sched_out(task, next);
1092 }
1093
1094 extern void perf_event_mmap(struct vm_area_struct *vma);
1095 extern struct perf_guest_info_callbacks *perf_guest_cbs;
1096 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1097 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1098
1099 extern void perf_event_comm(struct task_struct *tsk);
1100 extern void perf_event_fork(struct task_struct *tsk);
1101
1102 /* Callchains */
1103 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
1104
1105 extern void perf_callchain_user(struct perf_callchain_entry *entry,
1106                                 struct pt_regs *regs);
1107 extern void perf_callchain_kernel(struct perf_callchain_entry *entry,
1108                                   struct pt_regs *regs);
1109
1110
1111 static inline void
1112 perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
1113 {
1114         if (entry->nr < PERF_MAX_STACK_DEPTH)
1115                 entry->ip[entry->nr++] = ip;
1116 }
1117
1118 extern int sysctl_perf_event_paranoid;
1119 extern int sysctl_perf_event_mlock;
1120 extern int sysctl_perf_event_sample_rate;
1121
1122 extern int perf_proc_update_handler(struct ctl_table *table, int write,
1123                 void __user *buffer, size_t *lenp,
1124                 loff_t *ppos);
1125
1126 static inline bool perf_paranoid_tracepoint_raw(void)
1127 {
1128         return sysctl_perf_event_paranoid > -1;
1129 }
1130
1131 static inline bool perf_paranoid_cpu(void)
1132 {
1133         return sysctl_perf_event_paranoid > 0;
1134 }
1135
1136 static inline bool perf_paranoid_kernel(void)
1137 {
1138         return sysctl_perf_event_paranoid > 1;
1139 }
1140
1141 extern void perf_event_init(void);
1142 extern void perf_tp_event(u64 addr, u64 count, void *record,
1143                           int entry_size, struct pt_regs *regs,
1144                           struct hlist_head *head, int rctx);
1145 extern void perf_bp_event(struct perf_event *event, void *data);
1146
1147 #ifndef perf_misc_flags
1148 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_RECORD_MISC_USER : \
1149                                  PERF_RECORD_MISC_KERNEL)
1150 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
1151 #endif
1152
1153 extern int perf_output_begin(struct perf_output_handle *handle,
1154                              struct perf_event *event, unsigned int size,
1155                              int nmi, int sample);
1156 extern void perf_output_end(struct perf_output_handle *handle);
1157 extern void perf_output_copy(struct perf_output_handle *handle,
1158                              const void *buf, unsigned int len);
1159 extern int perf_swevent_get_recursion_context(void);
1160 extern void perf_swevent_put_recursion_context(int rctx);
1161 extern void perf_event_enable(struct perf_event *event);
1162 extern void perf_event_disable(struct perf_event *event);
1163 extern void perf_event_task_tick(void);
1164 #else
1165 static inline void
1166 perf_event_task_sched_in(struct task_struct *task)                      { }
1167 static inline void
1168 perf_event_task_sched_out(struct task_struct *task,
1169                             struct task_struct *next)                   { }
1170 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
1171 static inline void perf_event_exit_task(struct task_struct *child)      { }
1172 static inline void perf_event_free_task(struct task_struct *task)       { }
1173 static inline void perf_event_delayed_put(struct task_struct *task)     { }
1174 static inline void perf_event_print_debug(void)                         { }
1175 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
1176 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
1177
1178 static inline void
1179 perf_sw_event(u32 event_id, u64 nr, int nmi,
1180                      struct pt_regs *regs, u64 addr)                    { }
1181 static inline void
1182 perf_bp_event(struct perf_event *event, void *data)                     { }
1183
1184 static inline int perf_register_guest_info_callbacks
1185 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1186 static inline int perf_unregister_guest_info_callbacks
1187 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1188
1189 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
1190 static inline void perf_event_comm(struct task_struct *tsk)             { }
1191 static inline void perf_event_fork(struct task_struct *tsk)             { }
1192 static inline void perf_event_init(void)                                { }
1193 static inline int  perf_swevent_get_recursion_context(void)             { return -1; }
1194 static inline void perf_swevent_put_recursion_context(int rctx)         { }
1195 static inline void perf_event_enable(struct perf_event *event)          { }
1196 static inline void perf_event_disable(struct perf_event *event)         { }
1197 static inline void perf_event_task_tick(void)                           { }
1198 #endif
1199
1200 #define perf_output_put(handle, x) \
1201         perf_output_copy((handle), &(x), sizeof(x))
1202
1203 /*
1204  * This has to have a higher priority than migration_notifier in sched.c.
1205  */
1206 #define perf_cpu_notifier(fn)                                   \
1207 do {                                                            \
1208         static struct notifier_block fn##_nb __cpuinitdata =    \
1209                 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
1210         fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,             \
1211                 (void *)(unsigned long)smp_processor_id());     \
1212         fn(&fn##_nb, (unsigned long)CPU_STARTING,               \
1213                 (void *)(unsigned long)smp_processor_id());     \
1214         fn(&fn##_nb, (unsigned long)CPU_ONLINE,                 \
1215                 (void *)(unsigned long)smp_processor_id());     \
1216         register_cpu_notifier(&fn##_nb);                        \
1217 } while (0)
1218
1219 #endif /* __KERNEL__ */
1220 #endif /* _LINUX_PERF_EVENT_H */