include/linux/perf_event.h

   1 /*
   2  * Performance events:
   3  *
   4  *    Copyright (C) 2008-2009, Thomas Gleixner <[email protected]>
   5  *    Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
   6  *    Copyright (C) 2008-2011, 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, NODE } 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         PERF_COUNT_HW_CACHE_NODE                = 6,
  76
  77         PERF_COUNT_HW_CACHE_MAX,                /* non-ABI */
  78 };
  79
  80 enum perf_hw_cache_op_id {
  81         PERF_COUNT_HW_CACHE_OP_READ             = 0,
  82         PERF_COUNT_HW_CACHE_OP_WRITE            = 1,
  83         PERF_COUNT_HW_CACHE_OP_PREFETCH         = 2,
  84
  85         PERF_COUNT_HW_CACHE_OP_MAX,             /* non-ABI */
  86 };
  87
  88 enum perf_hw_cache_op_result_id {
  89         PERF_COUNT_HW_CACHE_RESULT_ACCESS       = 0,
  90         PERF_COUNT_HW_CACHE_RESULT_MISS         = 1,
  91
  92         PERF_COUNT_HW_CACHE_RESULT_MAX,         /* non-ABI */
  93 };
  94
  95 /*
  96  * Special "software" events provided by the kernel, even if the hardware
  97  * does not support performance events. These events measure various
  98  * physical and sw events of the kernel (and allow the profiling of them as
  99  * well):
 100  */
 101 enum perf_sw_ids {
 102         PERF_COUNT_SW_CPU_CLOCK                 = 0,
 103         PERF_COUNT_SW_TASK_CLOCK                = 1,
 104         PERF_COUNT_SW_PAGE_FAULTS               = 2,
 105         PERF_COUNT_SW_CONTEXT_SWITCHES          = 3,
 106         PERF_COUNT_SW_CPU_MIGRATIONS            = 4,
 107         PERF_COUNT_SW_PAGE_FAULTS_MIN           = 5,
 108         PERF_COUNT_SW_PAGE_FAULTS_MAJ           = 6,
 109         PERF_COUNT_SW_ALIGNMENT_FAULTS          = 7,
 110         PERF_COUNT_SW_EMULATION_FAULTS          = 8,
 111
 112         PERF_COUNT_SW_MAX,                      /* non-ABI */
 113 };
 114
 115 /*
 116  * Bits that can be set in attr.sample_type to request information
 117  * in the overflow packets.
 118  */
 119 enum perf_event_sample_format {
 120         PERF_SAMPLE_IP                          = 1U << 0,
 121         PERF_SAMPLE_TID                         = 1U << 1,
 122         PERF_SAMPLE_TIME                        = 1U << 2,
 123         PERF_SAMPLE_ADDR                        = 1U << 3,
 124         PERF_SAMPLE_READ                        = 1U << 4,
 125         PERF_SAMPLE_CALLCHAIN                   = 1U << 5,
 126         PERF_SAMPLE_ID                          = 1U << 6,
 127         PERF_SAMPLE_CPU                         = 1U << 7,
 128         PERF_SAMPLE_PERIOD                      = 1U << 8,
 129         PERF_SAMPLE_STREAM_ID                   = 1U << 9,
 130         PERF_SAMPLE_RAW                         = 1U << 10,
 131
 132         PERF_SAMPLE_MAX = 1U << 11,             /* non-ABI */
 133 };
 134
 135 /*
 136  * The format of the data returned by read() on a perf event fd,
 137  * as specified by attr.read_format:
 138  *
 139  * struct read_format {
 140  *      { u64           value;
 141  *        { u64         time_enabled; } && PERF_FORMAT_TOTAL_TIME_ENABLED
 142  *        { u64         time_running; } && PERF_FORMAT_TOTAL_TIME_RUNNING
 143  *        { u64         id;           } && PERF_FORMAT_ID
 144  *      } && !PERF_FORMAT_GROUP
 145  *
 146  *      { u64           nr;
 147  *        { u64         time_enabled; } && PERF_FORMAT_TOTAL_TIME_ENABLED
 148  *        { u64         time_running; } && PERF_FORMAT_TOTAL_TIME_RUNNING
 149  *        { u64         value;
 150  *          { u64       id;           } && PERF_FORMAT_ID
 151  *        }             cntr[nr];
 152  *      } && PERF_FORMAT_GROUP
 153  * };
 154  */
 155 enum perf_event_read_format {
 156         PERF_FORMAT_TOTAL_TIME_ENABLED          = 1U << 0,
 157         PERF_FORMAT_TOTAL_TIME_RUNNING          = 1U << 1,
 158         PERF_FORMAT_ID                          = 1U << 2,
 159         PERF_FORMAT_GROUP                       = 1U << 3,
 160
 161         PERF_FORMAT_MAX = 1U << 4,              /* non-ABI */
 162 };
 163
 164 #define PERF_ATTR_SIZE_VER0     64      /* sizeof first published struct */
 165
 166 /*
 167  * Hardware event_id to monitor via a performance monitoring event:
 168  */
 169 struct perf_event_attr {
 170
 171         /*
 172          * Major type: hardware/software/tracepoint/etc.
 173          */
 174         __u32                   type;
 175
 176         /*
 177          * Size of the attr structure, for fwd/bwd compat.
 178          */
 179         __u32                   size;
 180
 181         /*
 182          * Type specific configuration information.
 183          */
 184         __u64                   config;
 185
 186         union {
 187                 __u64           sample_period;
 188                 __u64           sample_freq;
 189         };
 190
 191         __u64                   sample_type;
 192         __u64                   read_format;
 193
 194         __u64                   disabled       :  1, /* off by default        */
 195                                 inherit        :  1, /* children inherit it   */
 196                                 pinned         :  1, /* must always be on PMU */
 197                                 exclusive      :  1, /* only group on PMU     */
 198                                 exclude_user   :  1, /* don't count user      */
 199                                 exclude_kernel :  1, /* ditto kernel          */
 200                                 exclude_hv     :  1, /* ditto hypervisor      */
 201                                 exclude_idle   :  1, /* don't count when idle */
 202                                 mmap           :  1, /* include mmap data     */
 203                                 comm           :  1, /* include comm data     */
 204                                 freq           :  1, /* use freq, not period  */
 205                                 inherit_stat   :  1, /* per task counts       */
 206                                 enable_on_exec :  1, /* next exec enables     */
 207                                 task           :  1, /* trace fork/exit       */
 208                                 watermark      :  1, /* wakeup_watermark      */
 209                                 /*
 210                                  * precise_ip:
 211                                  *
 212                                  *  0 - SAMPLE_IP can have arbitrary skid
 213                                  *  1 - SAMPLE_IP must have constant skid
 214                                  *  2 - SAMPLE_IP requested to have 0 skid
 215                                  *  3 - SAMPLE_IP must have 0 skid
 216                                  *
 217                                  *  See also PERF_RECORD_MISC_EXACT_IP
 218                                  */
 219                                 precise_ip     :  2, /* skid constraint       */
 220                                 mmap_data      :  1, /* non-exec mmap data    */
 221                                 sample_id_all  :  1, /* sample_type all events */
 222
 223                                 __reserved_1   : 45;
 224
 225         union {
 226                 __u32           wakeup_events;    /* wakeup every n events */
 227                 __u32           wakeup_watermark; /* bytes before wakeup   */
 228         };
 229
 230         __u32                   bp_type;
 231         union {
 232                 __u64           bp_addr;
 233                 __u64           config1; /* extension of config */
 234         };
 235         union {
 236                 __u64           bp_len;
 237                 __u64           config2; /* extension of config1 */
 238         };
 239 };
 240
 241 /*
 242  * Ioctls that can be done on a perf event fd:
 243  */
 244 #define PERF_EVENT_IOC_ENABLE           _IO ('$', 0)
 245 #define PERF_EVENT_IOC_DISABLE          _IO ('$', 1)
 246 #define PERF_EVENT_IOC_REFRESH          _IO ('$', 2)
 247 #define PERF_EVENT_IOC_RESET            _IO ('$', 3)
 248 #define PERF_EVENT_IOC_PERIOD           _IOW('$', 4, __u64)
 249 #define PERF_EVENT_IOC_SET_OUTPUT       _IO ('$', 5)
 250 #define PERF_EVENT_IOC_SET_FILTER       _IOW('$', 6, char *)
 251
 252 enum perf_event_ioc_flags {
 253         PERF_IOC_FLAG_GROUP             = 1U << 0,
 254 };
 255
 256 /*
 257  * Structure of the page that can be mapped via mmap
 258  */
 259 struct perf_event_mmap_page {
 260         __u32   version;                /* version number of this structure */
 261         __u32   compat_version;         /* lowest version this is compat with */
 262
 263         /*
 264          * Bits needed to read the hw events in user-space.
 265          *
 266          *   u32 seq;
 267          *   s64 count;
 268          *
 269          *   do {
 270          *     seq = pc->lock;
 271          *
 272          *     barrier()
 273          *     if (pc->index) {
 274          *       count = pmc_read(pc->index - 1);
 275          *       count += pc->offset;
 276          *     } else
 277          *       goto regular_read;
 278          *
 279          *     barrier();
 280          *   } while (pc->lock != seq);
 281          *
 282          * NOTE: for obvious reason this only works on self-monitoring
 283          *       processes.
 284          */
 285         __u32   lock;                   /* seqlock for synchronization */
 286         __u32   index;                  /* hardware event identifier */
 287         __s64   offset;                 /* add to hardware event value */
 288         __u64   time_enabled;           /* time event active */
 289         __u64   time_running;           /* time event on cpu */
 290
 291                 /*
 292                  * Hole for extension of the self monitor capabilities
 293                  */
 294
 295         __u64   __reserved[123];        /* align to 1k */
 296
 297         /*
 298          * Control data for the mmap() data buffer.
 299          *
 300          * User-space reading the @data_head value should issue an rmb(), on
 301          * SMP capable platforms, after reading this value -- see
 302          * perf_event_wakeup().
 303          *
 304          * When the mapping is PROT_WRITE the @data_tail value should be
 305          * written by userspace to reflect the last read data. In this case
 306          * the kernel will not over-write unread data.
 307          */
 308         __u64   data_head;              /* head in the data section */
 309         __u64   data_tail;              /* user-space written tail */
 310 };
 311
 312 #define PERF_RECORD_MISC_CPUMODE_MASK           (7 << 0)
 313 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN        (0 << 0)
 314 #define PERF_RECORD_MISC_KERNEL                 (1 << 0)
 315 #define PERF_RECORD_MISC_USER                   (2 << 0)
 316 #define PERF_RECORD_MISC_HYPERVISOR             (3 << 0)
 317 #define PERF_RECORD_MISC_GUEST_KERNEL           (4 << 0)
 318 #define PERF_RECORD_MISC_GUEST_USER             (5 << 0)
 319
 320 /*
 321  * Indicates that the content of PERF_SAMPLE_IP points to
 322  * the actual instruction that triggered the event. See also
 323  * perf_event_attr::precise_ip.
 324  */
 325 #define PERF_RECORD_MISC_EXACT_IP               (1 << 14)
 326 /*
 327  * Reserve the last bit to indicate some extended misc field
 328  */
 329 #define PERF_RECORD_MISC_EXT_RESERVED           (1 << 15)
 330
 331 struct perf_event_header {
 332         __u32   type;
 333         __u16   misc;
 334         __u16   size;
 335 };
 336
 337 enum perf_event_type {
 338
 339         /*
 340          * If perf_event_attr.sample_id_all is set then all event types will
 341          * have the sample_type selected fields related to where/when
 342          * (identity) an event took place (TID, TIME, ID, CPU, STREAM_ID)
 343          * described in PERF_RECORD_SAMPLE below, it will be stashed just after
 344          * the perf_event_header and the fields already present for the existing
 345          * fields, i.e. at the end of the payload. That way a newer perf.data
 346          * file will be supported by older perf tools, with these new optional
 347          * fields being ignored.
 348          *
 349          * The MMAP events record the PROT_EXEC mappings so that we can
 350          * correlate userspace IPs to code. They have the following structure:
 351          *
 352          * struct {
 353          *      struct perf_event_header        header;
 354          *
 355          *      u32                             pid, tid;
 356          *      u64                             addr;
 357          *      u64                             len;
 358          *      u64                             pgoff;
 359          *      char                            filename[];
 360          * };
 361          */
 362         PERF_RECORD_MMAP                        = 1,
 363
 364         /*
 365          * struct {
 366          *      struct perf_event_header        header;
 367          *      u64                             id;
 368          *      u64                             lost;
 369          * };
 370          */
 371         PERF_RECORD_LOST                        = 2,
 372
 373         /*
 374          * struct {
 375          *      struct perf_event_header        header;
 376          *
 377          *      u32                             pid, tid;
 378          *      char                            comm[];
 379          * };
 380          */
 381         PERF_RECORD_COMM                        = 3,
 382
 383         /*
 384          * struct {
 385          *      struct perf_event_header        header;
 386          *      u32                             pid, ppid;
 387          *      u32                             tid, ptid;
 388          *      u64                             time;
 389          * };
 390          */
 391         PERF_RECORD_EXIT                        = 4,
 392
 393         /*
 394          * struct {
 395          *      struct perf_event_header        header;
 396          *      u64                             time;
 397          *      u64                             id;
 398          *      u64                             stream_id;
 399          * };
 400          */
 401         PERF_RECORD_THROTTLE                    = 5,
 402         PERF_RECORD_UNTHROTTLE                  = 6,
 403
 404         /*
 405          * struct {
 406          *      struct perf_event_header        header;
 407          *      u32                             pid, ppid;
 408          *      u32                             tid, ptid;
 409          *      u64                             time;
 410          * };
 411          */
 412         PERF_RECORD_FORK                        = 7,
 413
 414         /*
 415          * struct {
 416          *      struct perf_event_header        header;
 417          *      u32                             pid, tid;
 418          *
 419          *      struct read_format              values;
 420          * };
 421          */
 422         PERF_RECORD_READ                        = 8,
 423
 424         /*
 425          * struct {
 426          *      struct perf_event_header        header;
 427          *
 428          *      { u64                   ip;       } && PERF_SAMPLE_IP
 429          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
 430          *      { u64                   time;     } && PERF_SAMPLE_TIME
 431          *      { u64                   addr;     } && PERF_SAMPLE_ADDR
 432          *      { u64                   id;       } && PERF_SAMPLE_ID
 433          *      { u64                   stream_id;} && PERF_SAMPLE_STREAM_ID
 434          *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
 435          *      { u64                   period;   } && PERF_SAMPLE_PERIOD
 436          *
 437          *      { struct read_format    values;   } && PERF_SAMPLE_READ
 438          *
 439          *      { u64                   nr,
 440          *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
 441          *
 442          *      #
 443          *      # The RAW record below is opaque data wrt the ABI
 444          *      #
 445          *      # That is, the ABI doesn't make any promises wrt to
 446          *      # the stability of its content, it may vary depending
 447          *      # on event, hardware, kernel version and phase of
 448          *      # the moon.
 449          *      #
 450          *      # In other words, PERF_SAMPLE_RAW contents are not an ABI.
 451          *      #
 452          *
 453          *      { u32                   size;
 454          *        char                  data[size];}&& PERF_SAMPLE_RAW
 455          * };
 456          */
 457         PERF_RECORD_SAMPLE                      = 9,
 458
 459         PERF_RECORD_MAX,                        /* non-ABI */
 460 };
 461
 462 enum perf_callchain_context {
 463         PERF_CONTEXT_HV                 = (__u64)-32,
 464         PERF_CONTEXT_KERNEL             = (__u64)-128,
 465         PERF_CONTEXT_USER               = (__u64)-512,
 466
 467         PERF_CONTEXT_GUEST              = (__u64)-2048,
 468         PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
 469         PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
 470
 471         PERF_CONTEXT_MAX                = (__u64)-4095,
 472 };
 473
 474 #define PERF_FLAG_FD_NO_GROUP           (1U << 0)
 475 #define PERF_FLAG_FD_OUTPUT             (1U << 1)
 476 #define PERF_FLAG_PID_CGROUP            (1U << 2) /* pid=cgroup id, per-cpu mode only */
 477
 478 #ifdef __KERNEL__
 479 /*
 480  * Kernel-internal data types and definitions:
 481  */
 482
 483 #ifdef CONFIG_PERF_EVENTS
 484 # include <linux/cgroup.h>
 485 # include <asm/perf_event.h>
 486 # include <asm/local64.h>
 487 #endif
 488
 489 struct perf_guest_info_callbacks {
 490         int                             (*is_in_guest)(void);
 491         int                             (*is_user_mode)(void);
 492         unsigned long                   (*get_guest_ip)(void);
 493 };
 494
 495 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 496 #include <asm/hw_breakpoint.h>
 497 #endif
 498
 499 #include <linux/list.h>
 500 #include <linux/mutex.h>
 501 #include <linux/rculist.h>
 502 #include <linux/rcupdate.h>
 503 #include <linux/spinlock.h>
 504 #include <linux/hrtimer.h>
 505 #include <linux/fs.h>
 506 #include <linux/pid_namespace.h>
 507 #include <linux/workqueue.h>
 508 #include <linux/ftrace.h>
 509 #include <linux/cpu.h>
 510 #include <linux/irq_work.h>
 511 #include <linux/jump_label.h>
 512 #include <linux/atomic.h>
 513 #include <asm/local.h>
 514
 515 #define PERF_MAX_STACK_DEPTH            255
 516
 517 struct perf_callchain_entry {
 518         __u64                           nr;
 519         __u64                           ip[PERF_MAX_STACK_DEPTH];
 520 };
 521
 522 struct perf_raw_record {
 523         u32                             size;
 524         void                            *data;
 525 };
 526
 527 struct perf_branch_entry {
 528         __u64                           from;
 529         __u64                           to;
 530         __u64                           flags;
 531 };
 532
 533 struct perf_branch_stack {
 534         __u64                           nr;
 535         struct perf_branch_entry        entries[0];
 536 };
 537
 538 struct task_struct;
 539
 540 /*
 541  * extra PMU register associated with an event
 542  */
 543 struct hw_perf_event_extra {
 544         u64             config; /* register value */
 545         unsigned int    reg;    /* register address or index */
 546         int             alloc;  /* extra register already allocated */
 547         int             idx;    /* index in shared_regs->regs[] */
 548 };
 549
 550 /**
 551  * struct hw_perf_event - performance event hardware details:
 552  */
 553 struct hw_perf_event {
 554 #ifdef CONFIG_PERF_EVENTS
 555         union {
 556                 struct { /* hardware */
 557                         u64             config;
 558                         u64             last_tag;
 559                         unsigned long   config_base;
 560                         unsigned long   event_base;
 561                         int             idx;
 562                         int             last_cpu;
 563                         struct hw_perf_event_extra extra_reg;
 564                 };
 565                 struct { /* software */
 566                         struct hrtimer  hrtimer;
 567                 };
 568 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 569                 struct { /* breakpoint */
 570                         struct arch_hw_breakpoint       info;
 571                         struct list_head                bp_list;
 572                         /*
 573                          * Crufty hack to avoid the chicken and egg
 574                          * problem hw_breakpoint has with context
 575                          * creation and event initalization.
 576                          */
 577                         struct task_struct              *bp_target;
 578                 };
 579 #endif
 580         };
 581         int                             state;
 582         local64_t                       prev_count;
 583         u64                             sample_period;
 584         u64                             last_period;
 585         local64_t                       period_left;
 586         u64                             interrupts;
 587
 588         u64                             freq_time_stamp;
 589         u64                             freq_count_stamp;
 590 #endif
 591 };
 592
 593 /*
 594  * hw_perf_event::state flags
 595  */
 596 #define PERF_HES_STOPPED        0x01 /* the counter is stopped */
 597 #define PERF_HES_UPTODATE       0x02 /* event->count up-to-date */
 598 #define PERF_HES_ARCH           0x04
 599
 600 struct perf_event;
 601
 602 /*
 603  * Common implementation detail of pmu::{start,commit,cancel}_txn
 604  */
 605 #define PERF_EVENT_TXN 0x1
 606
 607 /**
 608  * struct pmu - generic performance monitoring unit
 609  */
 610 struct pmu {
 611         struct list_head                entry;
 612
 613         struct device                   *dev;
 614         char                            *name;
 615         int                             type;
 616
 617         int * __percpu                  pmu_disable_count;
 618         struct perf_cpu_context * __percpu pmu_cpu_context;
 619         int                             task_ctx_nr;
 620
 621         /*
 622          * Fully disable/enable this PMU, can be used to protect from the PMI
 623          * as well as for lazy/batch writing of the MSRs.
 624          */
 625         void (*pmu_enable)              (struct pmu *pmu); /* optional */
 626         void (*pmu_disable)             (struct pmu *pmu); /* optional */
 627
 628         /*
 629          * Try and initialize the event for this PMU.
 630          * Should return -ENOENT when the @event doesn't match this PMU.
 631          */
 632         int (*event_init)               (struct perf_event *event);
 633
 634 #define PERF_EF_START   0x01            /* start the counter when adding    */
 635 #define PERF_EF_RELOAD  0x02            /* reload the counter when starting */
 636 #define PERF_EF_UPDATE  0x04            /* update the counter when stopping */
 637
 638         /*
 639          * Adds/Removes a counter to/from the PMU, can be done inside
 640          * a transaction, see the ->*_txn() methods.
 641          */
 642         int  (*add)                     (struct perf_event *event, int flags);
 643         void (*del)                     (struct perf_event *event, int flags);
 644
 645         /*
 646          * Starts/Stops a counter present on the PMU. The PMI handler
 647          * should stop the counter when perf_event_overflow() returns
 648          * !0. ->start() will be used to continue.
 649          */
 650         void (*start)                   (struct perf_event *event, int flags);
 651         void (*stop)                    (struct perf_event *event, int flags);
 652
 653         /*
 654          * Updates the counter value of the event.
 655          */
 656         void (*read)                    (struct perf_event *event);
 657
 658         /*
 659          * Group events scheduling is treated as a transaction, add
 660          * group events as a whole and perform one schedulability test.
 661          * If the test fails, roll back the whole group
 662          *
 663          * Start the transaction, after this ->add() doesn't need to
 664          * do schedulability tests.
 665          */
 666         void (*start_txn)               (struct pmu *pmu); /* optional */
 667         /*
 668          * If ->start_txn() disabled the ->add() schedulability test
 669          * then ->commit_txn() is required to perform one. On success
 670          * the transaction is closed. On error the transaction is kept
 671          * open until ->cancel_txn() is called.
 672          */
 673         int  (*commit_txn)              (struct pmu *pmu); /* optional */
 674         /*
 675          * Will cancel the transaction, assumes ->del() is called
 676          * for each successful ->add() during the transaction.
 677          */
 678         void (*cancel_txn)              (struct pmu *pmu); /* optional */
 679 };
 680
 681 /**
 682  * enum perf_event_active_state - the states of a event
 683  */
 684 enum perf_event_active_state {
 685         PERF_EVENT_STATE_ERROR          = -2,
 686         PERF_EVENT_STATE_OFF            = -1,
 687         PERF_EVENT_STATE_INACTIVE       =  0,
 688         PERF_EVENT_STATE_ACTIVE         =  1,
 689 };
 690
 691 struct file;
 692 struct perf_sample_data;
 693
 694 typedef void (*perf_overflow_handler_t)(struct perf_event *,
 695                                         struct perf_sample_data *,
 696                                         struct pt_regs *regs);
 697
 698 enum perf_group_flag {
 699         PERF_GROUP_SOFTWARE             = 0x1,
 700 };
 701
 702 #define SWEVENT_HLIST_BITS              8
 703 #define SWEVENT_HLIST_SIZE              (1 << SWEVENT_HLIST_BITS)
 704
 705 struct swevent_hlist {
 706         struct hlist_head               heads[SWEVENT_HLIST_SIZE];
 707         struct rcu_head                 rcu_head;
 708 };
 709
 710 #define PERF_ATTACH_CONTEXT     0x01
 711 #define PERF_ATTACH_GROUP       0x02
 712 #define PERF_ATTACH_TASK        0x04
 713
 714 #ifdef CONFIG_CGROUP_PERF
 715 /*
 716  * perf_cgroup_info keeps track of time_enabled for a cgroup.
 717  * This is a per-cpu dynamically allocated data structure.
 718  */
 719 struct perf_cgroup_info {
 720         u64                             time;
 721         u64                             timestamp;
 722 };
 723
 724 struct perf_cgroup {
 725         struct                          cgroup_subsys_state css;
 726         struct                          perf_cgroup_info *info; /* timing info, one per cpu */
 727 };
 728 #endif
 729
 730 struct ring_buffer;
 731
 732 /**
 733  * struct perf_event - performance event kernel representation:
 734  */
 735 struct perf_event {
 736 #ifdef CONFIG_PERF_EVENTS
 737         struct list_head                group_entry;
 738         struct list_head                event_entry;
 739         struct list_head                sibling_list;
 740         struct hlist_node               hlist_entry;
 741         int                             nr_siblings;
 742         int                             group_flags;
 743         struct perf_event               *group_leader;
 744         struct pmu                      *pmu;
 745
 746         enum perf_event_active_state    state;
 747         unsigned int                    attach_state;
 748         local64_t                       count;
 749         atomic64_t                      child_count;
 750
 751         /*
 752          * These are the total time in nanoseconds that the event
 753          * has been enabled (i.e. eligible to run, and the task has
 754          * been scheduled in, if this is a per-task event)
 755          * and running (scheduled onto the CPU), respectively.
 756          *
 757          * They are computed from tstamp_enabled, tstamp_running and
 758          * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
 759          */
 760         u64                             total_time_enabled;
 761         u64                             total_time_running;
 762
 763         /*
 764          * These are timestamps used for computing total_time_enabled
 765          * and total_time_running when the event is in INACTIVE or
 766          * ACTIVE state, measured in nanoseconds from an arbitrary point
 767          * in time.
 768          * tstamp_enabled: the notional time when the event was enabled
 769          * tstamp_running: the notional time when the event was scheduled on
 770          * tstamp_stopped: in INACTIVE state, the notional time when the
 771          *      event was scheduled off.
 772          */
 773         u64                             tstamp_enabled;
 774         u64                             tstamp_running;
 775         u64                             tstamp_stopped;
 776
 777         /*
 778          * timestamp shadows the actual context timing but it can
 779          * be safely used in NMI interrupt context. It reflects the
 780          * context time as it was when the event was last scheduled in.
 781          *
 782          * ctx_time already accounts for ctx->timestamp. Therefore to
 783          * compute ctx_time for a sample, simply add perf_clock().
 784          */
 785         u64                             shadow_ctx_time;
 786
 787         struct perf_event_attr          attr;
 788         u16                             header_size;
 789         u16                             id_header_size;
 790         u16                             read_size;
 791         struct hw_perf_event            hw;
 792
 793         struct perf_event_context       *ctx;
 794         struct file                     *filp;
 795
 796         /*
 797          * These accumulate total time (in nanoseconds) that children
 798          * events have been enabled and running, respectively.
 799          */
 800         atomic64_t                      child_total_time_enabled;
 801         atomic64_t                      child_total_time_running;
 802
 803         /*
 804          * Protect attach/detach and child_list:
 805          */
 806         struct mutex                    child_mutex;
 807         struct list_head                child_list;
 808         struct perf_event               *parent;
 809
 810         int                             oncpu;
 811         int                             cpu;
 812
 813         struct list_head                owner_entry;
 814         struct task_struct              *owner;
 815
 816         /* mmap bits */
 817         struct mutex                    mmap_mutex;
 818         atomic_t                        mmap_count;
 819         int                             mmap_locked;
 820         struct user_struct              *mmap_user;
 821         struct ring_buffer              *rb;
 822
 823         /* poll related */
 824         wait_queue_head_t               waitq;
 825         struct fasync_struct            *fasync;
 826
 827         /* delayed work for NMIs and such */
 828         int                             pending_wakeup;
 829         int                             pending_kill;
 830         int                             pending_disable;
 831         struct irq_work                 pending;
 832
 833         atomic_t                        event_limit;
 834
 835         void (*destroy)(struct perf_event *);
 836         struct rcu_head                 rcu_head;
 837
 838         struct pid_namespace            *ns;
 839         u64                             id;
 840
 841         perf_overflow_handler_t         overflow_handler;
 842         void                            *overflow_handler_context;
 843
 844 #ifdef CONFIG_EVENT_TRACING
 845         struct ftrace_event_call        *tp_event;
 846         struct event_filter             *filter;
 847 #endif
 848
 849 #ifdef CONFIG_CGROUP_PERF
 850         struct perf_cgroup              *cgrp; /* cgroup event is attach to */
 851         int                             cgrp_defer_enabled;
 852 #endif
 853
 854 #endif /* CONFIG_PERF_EVENTS */
 855 };
 856
 857 enum perf_event_context_type {
 858         task_context,
 859         cpu_context,
 860 };
 861
 862 /**
 863  * struct perf_event_context - event context structure
 864  *
 865  * Used as a container for task events and CPU events as well:
 866  */
 867 struct perf_event_context {
 868         struct pmu                      *pmu;
 869         enum perf_event_context_type    type;
 870         /*
 871          * Protect the states of the events in the list,
 872          * nr_active, and the list:
 873          */
 874         raw_spinlock_t                  lock;
 875         /*
 876          * Protect the list of events.  Locking either mutex or lock
 877          * is sufficient to ensure the list doesn't change; to change
 878          * the list you need to lock both the mutex and the spinlock.
 879          */
 880         struct mutex                    mutex;
 881
 882         struct list_head                pinned_groups;
 883         struct list_head                flexible_groups;
 884         struct list_head                event_list;
 885         int                             nr_events;
 886         int                             nr_active;
 887         int                             is_active;
 888         int                             nr_stat;
 889         int                             rotate_disable;
 890         atomic_t                        refcount;
 891         struct task_struct              *task;
 892
 893         /*
 894          * Context clock, runs when context enabled.
 895          */
 896         u64                             time;
 897         u64                             timestamp;
 898
 899         /*
 900          * These fields let us detect when two contexts have both
 901          * been cloned (inherited) from a common ancestor.
 902          */
 903         struct perf_event_context       *parent_ctx;
 904         u64                             parent_gen;
 905         u64                             generation;
 906         int                             pin_count;
 907         int                             nr_cgroups; /* cgroup events present */
 908         struct rcu_head                 rcu_head;
 909 };
 910
 911 /*
 912  * Number of contexts where an event can trigger:
 913  *      task, softirq, hardirq, nmi.
 914  */
 915 #define PERF_NR_CONTEXTS        4
 916
 917 /**
 918  * struct perf_event_cpu_context - per cpu event context structure
 919  */
 920 struct perf_cpu_context {
 921         struct perf_event_context       ctx;
 922         struct perf_event_context       *task_ctx;
 923         int                             active_oncpu;
 924         int                             exclusive;
 925         struct list_head                rotation_list;
 926         int                             jiffies_interval;
 927         struct pmu                      *active_pmu;
 928         struct perf_cgroup              *cgrp;
 929 };
 930
 931 struct perf_output_handle {
 932         struct perf_event               *event;
 933         struct ring_buffer              *rb;
 934         unsigned long                   wakeup;
 935         unsigned long                   size;
 936         void                            *addr;
 937         int                             page;
 938 };
 939
 940 #ifdef CONFIG_PERF_EVENTS
 941
 942 extern int perf_pmu_register(struct pmu *pmu, char *name, int type);
 943 extern void perf_pmu_unregister(struct pmu *pmu);
 944
 945 extern int perf_num_counters(void);
 946 extern const char *perf_pmu_name(void);
 947 extern void __perf_event_task_sched_in(struct task_struct *task);
 948 extern void __perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
 949 extern int perf_event_init_task(struct task_struct *child);
 950 extern void perf_event_exit_task(struct task_struct *child);
 951 extern void perf_event_free_task(struct task_struct *task);
 952 extern void perf_event_delayed_put(struct task_struct *task);
 953 extern void perf_event_print_debug(void);
 954 extern void perf_pmu_disable(struct pmu *pmu);
 955 extern void perf_pmu_enable(struct pmu *pmu);
 956 extern int perf_event_task_disable(void);
 957 extern int perf_event_task_enable(void);
 958 extern int perf_event_refresh(struct perf_event *event, int refresh);
 959 extern void perf_event_update_userpage(struct perf_event *event);
 960 extern int perf_event_release_kernel(struct perf_event *event);
 961 extern struct perf_event *
 962 perf_event_create_kernel_counter(struct perf_event_attr *attr,
 963                                 int cpu,
 964                                 struct task_struct *task,
 965                                 perf_overflow_handler_t callback,
 966                                 void *context);
 967 extern u64 perf_event_read_value(struct perf_event *event,
 968                                  u64 *enabled, u64 *running);
 969
 970 struct perf_sample_data {
 971         u64                             type;
 972
 973         u64                             ip;
 974         struct {
 975                 u32     pid;
 976                 u32     tid;
 977         }                               tid_entry;
 978         u64                             time;
 979         u64                             addr;
 980         u64                             id;
 981         u64                             stream_id;
 982         struct {
 983                 u32     cpu;
 984                 u32     reserved;
 985         }                               cpu_entry;
 986         u64                             period;
 987         struct perf_callchain_entry     *callchain;
 988         struct perf_raw_record          *raw;
 989 };
 990
 991 static inline void perf_sample_data_init(struct perf_sample_data *data, u64 addr)
 992 {
 993         data->addr = addr;
 994         data->raw  = NULL;
 995 }
 996
 997 extern void perf_output_sample(struct perf_output_handle *handle,
 998                                struct perf_event_header *header,
 999                                struct perf_sample_data *data,
1000                                struct perf_event *event);
1001 extern void perf_prepare_sample(struct perf_event_header *header,
1002                                 struct perf_sample_data *data,
1003                                 struct perf_event *event,
1004                                 struct pt_regs *regs);
1005
1006 extern int perf_event_overflow(struct perf_event *event,
1007                                  struct perf_sample_data *data,
1008                                  struct pt_regs *regs);
1009
1010 static inline bool is_sampling_event(struct perf_event *event)
1011 {
1012         return event->attr.sample_period != 0;
1013 }
1014
1015 /*
1016  * Return 1 for a software event, 0 for a hardware event
1017  */
1018 static inline int is_software_event(struct perf_event *event)
1019 {
1020         return event->pmu->task_ctx_nr == perf_sw_context;
1021 }
1022
1023 extern struct jump_label_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
1024
1025 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
1026
1027 #ifndef perf_arch_fetch_caller_regs
1028 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
1029 #endif
1030
1031 /*
1032  * Take a snapshot of the regs. Skip ip and frame pointer to
1033  * the nth caller. We only need a few of the regs:
1034  * - ip for PERF_SAMPLE_IP
1035  * - cs for user_mode() tests
1036  * - bp for callchains
1037  * - eflags, for future purposes, just in case
1038  */
1039 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
1040 {
1041         memset(regs, 0, sizeof(*regs));
1042
1043         perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
1044 }
1045
1046 static __always_inline void
1047 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
1048 {
1049         struct pt_regs hot_regs;
1050
1051         if (static_branch(&perf_swevent_enabled[event_id])) {
1052                 if (!regs) {
1053                         perf_fetch_caller_regs(&hot_regs);
1054                         regs = &hot_regs;
1055                 }
1056                 __perf_sw_event(event_id, nr, regs, addr);
1057         }
1058 }
1059
1060 extern struct jump_label_key perf_sched_events;
1061
1062 static inline void perf_event_task_sched_in(struct task_struct *task)
1063 {
1064         if (static_branch(&perf_sched_events))
1065                 __perf_event_task_sched_in(task);
1066 }
1067
1068 static inline void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next)
1069 {
1070         perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0);
1071
1072         __perf_event_task_sched_out(task, next);
1073 }
1074
1075 extern void perf_event_mmap(struct vm_area_struct *vma);
1076 extern struct perf_guest_info_callbacks *perf_guest_cbs;
1077 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1078 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1079
1080 extern void perf_event_comm(struct task_struct *tsk);
1081 extern void perf_event_fork(struct task_struct *tsk);
1082
1083 /* Callchains */
1084 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
1085
1086 extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
1087 extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
1088
1089 static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
1090 {
1091         if (entry->nr < PERF_MAX_STACK_DEPTH)
1092                 entry->ip[entry->nr++] = ip;
1093 }
1094
1095 extern int sysctl_perf_event_paranoid;
1096 extern int sysctl_perf_event_mlock;
1097 extern int sysctl_perf_event_sample_rate;
1098
1099 extern int perf_proc_update_handler(struct ctl_table *table, int write,
1100                 void __user *buffer, size_t *lenp,
1101                 loff_t *ppos);
1102
1103 static inline bool perf_paranoid_tracepoint_raw(void)
1104 {
1105         return sysctl_perf_event_paranoid > -1;
1106 }
1107
1108 static inline bool perf_paranoid_cpu(void)
1109 {
1110         return sysctl_perf_event_paranoid > 0;
1111 }
1112
1113 static inline bool perf_paranoid_kernel(void)
1114 {
1115         return sysctl_perf_event_paranoid > 1;
1116 }
1117
1118 extern void perf_event_init(void);
1119 extern void perf_tp_event(u64 addr, u64 count, void *record,
1120                           int entry_size, struct pt_regs *regs,
1121                           struct hlist_head *head, int rctx);
1122 extern void perf_bp_event(struct perf_event *event, void *data);
1123
1124 #ifndef perf_misc_flags
1125 # define perf_misc_flags(regs) \
1126                 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
1127 # define perf_instruction_pointer(regs) instruction_pointer(regs)
1128 #endif
1129
1130 extern int perf_output_begin(struct perf_output_handle *handle,
1131                              struct perf_event *event, unsigned int size);
1132 extern void perf_output_end(struct perf_output_handle *handle);
1133 extern void perf_output_copy(struct perf_output_handle *handle,
1134                              const void *buf, unsigned int len);
1135 extern int perf_swevent_get_recursion_context(void);
1136 extern void perf_swevent_put_recursion_context(int rctx);
1137 extern void perf_event_enable(struct perf_event *event);
1138 extern void perf_event_disable(struct perf_event *event);
1139 extern void perf_event_task_tick(void);
1140 #else
1141 static inline void
1142 perf_event_task_sched_in(struct task_struct *task)                      { }
1143 static inline void
1144 perf_event_task_sched_out(struct task_struct *task,
1145                             struct task_struct *next)                   { }
1146 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
1147 static inline void perf_event_exit_task(struct task_struct *child)      { }
1148 static inline void perf_event_free_task(struct task_struct *task)       { }
1149 static inline void perf_event_delayed_put(struct task_struct *task)     { }
1150 static inline void perf_event_print_debug(void)                         { }
1151 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
1152 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
1153 static inline int perf_event_refresh(struct perf_event *event, int refresh)
1154 {
1155         return -EINVAL;
1156 }
1157
1158 static inline void
1159 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)     { }
1160 static inline void
1161 perf_bp_event(struct perf_event *event, void *data)                     { }
1162
1163 static inline int perf_register_guest_info_callbacks
1164 (struct perf_guest_info_callbacks *callbacks)                           { return 0; }
1165 static inline int perf_unregister_guest_info_callbacks
1166 (struct perf_guest_info_callbacks *callbacks)                           { return 0; }
1167
1168 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
1169 static inline void perf_event_comm(struct task_struct *tsk)             { }
1170 static inline void perf_event_fork(struct task_struct *tsk)             { }
1171 static inline void perf_event_init(void)                                { }
1172 static inline int  perf_swevent_get_recursion_context(void)             { return -1; }
1173 static inline void perf_swevent_put_recursion_context(int rctx)         { }
1174 static inline void perf_event_enable(struct perf_event *event)          { }
1175 static inline void perf_event_disable(struct perf_event *event)         { }
1176 static inline void perf_event_task_tick(void)                           { }
1177 #endif
1178
1179 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
1180
1181 /*
1182  * This has to have a higher priority than migration_notifier in sched.c.
1183  */
1184 #define perf_cpu_notifier(fn)                                           \
1185 do {                                                                    \
1186         static struct notifier_block fn##_nb __cpuinitdata =            \
1187                 { .notifier_call = fn, .priority = CPU_PRI_PERF };      \
1188         fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,                     \
1189                 (void *)(unsigned long)smp_processor_id());             \
1190         fn(&fn##_nb, (unsigned long)CPU_STARTING,                       \
1191                 (void *)(unsigned long)smp_processor_id());             \
1192         fn(&fn##_nb, (unsigned long)CPU_ONLINE,                         \
1193                 (void *)(unsigned long)smp_processor_id());             \
1194         register_cpu_notifier(&fn##_nb);                                \
1195 } while (0)
1196
1197 #endif /* __KERNEL__ */
1198 #endif /* _LINUX_PERF_EVENT_H */