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   1 /*
   2  * Performance events:
   3  *
   4  *    Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
   5  *    Copyright (C) 2008-2009, Red Hat, Inc., Ingo Molnar
   6  *    Copyright (C) 2008-2009, Red Hat, Inc., Peter Zijlstra
   7  *
   8  * Data type definitions, declarations, prototypes.
   9  *
  10  *    Started by: Thomas Gleixner and Ingo Molnar
  11  *
  12  * For licencing details see kernel-base/COPYING
  13  */
  14 #ifndef _LINUX_PERF_EVENT_H
  15 #define _LINUX_PERF_EVENT_H
  16
  17 #include <linux/types.h>
  18 #include <linux/ioctl.h>
  19 #include <asm/byteorder.h>
  20
  21 /*
  22  * User-space ABI bits:
  23  */
  24
  25 /*
  26  * attr.type
  27  */
  28 enum perf_type_id {
  29         PERF_TYPE_HARDWARE                      = 0,
  30         PERF_TYPE_SOFTWARE                      = 1,
  31         PERF_TYPE_TRACEPOINT                    = 2,
  32         PERF_TYPE_HW_CACHE                      = 3,
  33         PERF_TYPE_RAW                           = 4,
  34         PERF_TYPE_BREAKPOINT                    = 5,
  35
  36         PERF_TYPE_MAX,                          /* non-ABI */
  37 };
  38
  39 /*
  40  * Generalized performance event event_id types, used by the
  41  * attr.event_id parameter of the sys_perf_event_open()
  42  * syscall:
  43  */
  44 enum perf_hw_id {
  45         /*
  46          * Common hardware events, generalized by the kernel:
  47          */
  48         PERF_COUNT_HW_CPU_CYCLES                = 0,
  49         PERF_COUNT_HW_INSTRUCTIONS              = 1,
  50         PERF_COUNT_HW_CACHE_REFERENCES          = 2,
  51         PERF_COUNT_HW_CACHE_MISSES              = 3,
  52         PERF_COUNT_HW_BRANCH_INSTRUCTIONS       = 4,
  53         PERF_COUNT_HW_BRANCH_MISSES             = 5,
  54         PERF_COUNT_HW_BUS_CYCLES                = 6,
  55
  56         PERF_COUNT_HW_MAX,                      /* non-ABI */
  57 };
  58
  59 /*
  60  * Generalized hardware cache events:
  61  *
  62  *       { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
  63  *       { read, write, prefetch } x
  64  *       { accesses, misses }
  65  */
  66 enum perf_hw_cache_id {
  67         PERF_COUNT_HW_CACHE_L1D                 = 0,
  68         PERF_COUNT_HW_CACHE_L1I                 = 1,
  69         PERF_COUNT_HW_CACHE_LL                  = 2,
  70         PERF_COUNT_HW_CACHE_DTLB                = 3,
  71         PERF_COUNT_HW_CACHE_ITLB                = 4,
  72         PERF_COUNT_HW_CACHE_BPU                 = 5,
  73
  74         PERF_COUNT_HW_CACHE_MAX,                /* non-ABI */
  75 };
  76
  77 enum perf_hw_cache_op_id {
  78         PERF_COUNT_HW_CACHE_OP_READ             = 0,
  79         PERF_COUNT_HW_CACHE_OP_WRITE            = 1,
  80         PERF_COUNT_HW_CACHE_OP_PREFETCH         = 2,
  81
  82         PERF_COUNT_HW_CACHE_OP_MAX,             /* non-ABI */
  83 };
  84
  85 enum perf_hw_cache_op_result_id {
  86         PERF_COUNT_HW_CACHE_RESULT_ACCESS       = 0,
  87         PERF_COUNT_HW_CACHE_RESULT_MISS         = 1,
  88
  89         PERF_COUNT_HW_CACHE_RESULT_MAX,         /* non-ABI */
  90 };
  91
  92 /*
  93  * Special "software" events provided by the kernel, even if the hardware
  94  * does not support performance events. These events measure various
  95  * physical and sw events of the kernel (and allow the profiling of them as
  96  * well):
  97  */
  98 enum perf_sw_ids {
  99         PERF_COUNT_SW_CPU_CLOCK                 = 0,
 100         PERF_COUNT_SW_TASK_CLOCK                = 1,
 101         PERF_COUNT_SW_PAGE_FAULTS               = 2,
 102         PERF_COUNT_SW_CONTEXT_SWITCHES          = 3,
 103         PERF_COUNT_SW_CPU_MIGRATIONS            = 4,
 104         PERF_COUNT_SW_PAGE_FAULTS_MIN           = 5,
 105         PERF_COUNT_SW_PAGE_FAULTS_MAJ           = 6,
 106         PERF_COUNT_SW_ALIGNMENT_FAULTS          = 7,
 107         PERF_COUNT_SW_EMULATION_FAULTS          = 8,
 108
 109         PERF_COUNT_SW_MAX,                      /* non-ABI */
 110 };
 111
 112 /*
 113  * Bits that can be set in attr.sample_type to request information
 114  * in the overflow packets.
 115  */
 116 enum perf_event_sample_format {
 117         PERF_SAMPLE_IP                          = 1U << 0,
 118         PERF_SAMPLE_TID                         = 1U << 1,
 119         PERF_SAMPLE_TIME                        = 1U << 2,
 120         PERF_SAMPLE_ADDR                        = 1U << 3,
 121         PERF_SAMPLE_READ                        = 1U << 4,
 122         PERF_SAMPLE_CALLCHAIN                   = 1U << 5,
 123         PERF_SAMPLE_ID                          = 1U << 6,
 124         PERF_SAMPLE_CPU                         = 1U << 7,
 125         PERF_SAMPLE_PERIOD                      = 1U << 8,
 126         PERF_SAMPLE_STREAM_ID                   = 1U << 9,
 127         PERF_SAMPLE_RAW                         = 1U << 10,
 128
 129         PERF_SAMPLE_MAX = 1U << 11,             /* non-ABI */
 130 };
 131
 132 /*
 133  * The format of the data returned by read() on a perf event fd,
 134  * as specified by attr.read_format:
 135  *
 136  * struct read_format {
 137  *      { u64           value;
 138  *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
 139  *        { u64         time_running; } && PERF_FORMAT_RUNNING
 140  *        { u64         id;           } && PERF_FORMAT_ID
 141  *      } && !PERF_FORMAT_GROUP
 142  *
 143  *      { u64           nr;
 144  *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
 145  *        { u64         time_running; } && PERF_FORMAT_RUNNING
 146  *        { u64         value;
 147  *          { u64       id;           } && PERF_FORMAT_ID
 148  *        }             cntr[nr];
 149  *      } && PERF_FORMAT_GROUP
 150  * };
 151  */
 152 enum perf_event_read_format {
 153         PERF_FORMAT_TOTAL_TIME_ENABLED          = 1U << 0,
 154         PERF_FORMAT_TOTAL_TIME_RUNNING          = 1U << 1,
 155         PERF_FORMAT_ID                          = 1U << 2,
 156         PERF_FORMAT_GROUP                       = 1U << 3,
 157
 158         PERF_FORMAT_MAX = 1U << 4,              /* non-ABI */
 159 };
 160
 161 #define PERF_ATTR_SIZE_VER0     64      /* sizeof first published struct */
 162
 163 /*
 164  * Hardware event_id to monitor via a performance monitoring event:
 165  */
 166 struct perf_event_attr {
 167
 168         /*
 169          * Major type: hardware/software/tracepoint/etc.
 170          */
 171         __u32                   type;
 172
 173         /*
 174          * Size of the attr structure, for fwd/bwd compat.
 175          */
 176         __u32                   size;
 177
 178         /*
 179          * Type specific configuration information.
 180          */
 181         __u64                   config;
 182
 183         union {
 184                 __u64           sample_period;
 185                 __u64           sample_freq;
 186         };
 187
 188         __u64                   sample_type;
 189         __u64                   read_format;
 190
 191         __u64                   disabled       :  1, /* off by default        */
 192                                 inherit        :  1, /* children inherit it   */
 193                                 pinned         :  1, /* must always be on PMU */
 194                                 exclusive      :  1, /* only group on PMU     */
 195                                 exclude_user   :  1, /* don't count user      */
 196                                 exclude_kernel :  1, /* ditto kernel          */
 197                                 exclude_hv     :  1, /* ditto hypervisor      */
 198                                 exclude_idle   :  1, /* don't count when idle */
 199                                 mmap           :  1, /* include mmap data     */
 200                                 comm           :  1, /* include comm data     */
 201                                 freq           :  1, /* use freq, not period  */
 202                                 inherit_stat   :  1, /* per task counts       */
 203                                 enable_on_exec :  1, /* next exec enables     */
 204                                 task           :  1, /* trace fork/exit       */
 205                                 watermark      :  1, /* wakeup_watermark      */
 206
 207                                 __reserved_1   : 49;
 208
 209         union {
 210                 __u32           wakeup_events;    /* wakeup every n events */
 211                 __u32           wakeup_watermark; /* bytes before wakeup   */
 212         };
 213
 214         struct { /* Hardware breakpoint info */
 215                 __u64           bp_addr;
 216                 __u32           bp_type;
 217                 __u32           bp_len;
 218                 __u64           __bp_reserved_1;
 219                 __u64           __bp_reserved_2;
 220         };
 221
 222         __u32                   __reserved_2;
 223
 224         __u64                   __reserved_3;
 225 };
 226
 227 /*
 228  * Ioctls that can be done on a perf event fd:
 229  */
 230 #define PERF_EVENT_IOC_ENABLE           _IO ('$', 0)
 231 #define PERF_EVENT_IOC_DISABLE          _IO ('$', 1)
 232 #define PERF_EVENT_IOC_REFRESH          _IO ('$', 2)
 233 #define PERF_EVENT_IOC_RESET            _IO ('$', 3)
 234 #define PERF_EVENT_IOC_PERIOD           _IOW('$', 4, __u64)
 235 #define PERF_EVENT_IOC_SET_OUTPUT       _IO ('$', 5)
 236 #define PERF_EVENT_IOC_SET_FILTER       _IOW('$', 6, char *)
 237
 238 enum perf_event_ioc_flags {
 239         PERF_IOC_FLAG_GROUP             = 1U << 0,
 240 };
 241
 242 /*
 243  * Structure of the page that can be mapped via mmap
 244  */
 245 struct perf_event_mmap_page {
 246         __u32   version;                /* version number of this structure */
 247         __u32   compat_version;         /* lowest version this is compat with */
 248
 249         /*
 250          * Bits needed to read the hw events in user-space.
 251          *
 252          *   u32 seq;
 253          *   s64 count;
 254          *
 255          *   do {
 256          *     seq = pc->lock;
 257          *
 258          *     barrier()
 259          *     if (pc->index) {
 260          *       count = pmc_read(pc->index - 1);
 261          *       count += pc->offset;
 262          *     } else
 263          *       goto regular_read;
 264          *
 265          *     barrier();
 266          *   } while (pc->lock != seq);
 267          *
 268          * NOTE: for obvious reason this only works on self-monitoring
 269          *       processes.
 270          */
 271         __u32   lock;                   /* seqlock for synchronization */
 272         __u32   index;                  /* hardware event identifier */
 273         __s64   offset;                 /* add to hardware event value */
 274         __u64   time_enabled;           /* time event active */
 275         __u64   time_running;           /* time event on cpu */
 276
 277                 /*
 278                  * Hole for extension of the self monitor capabilities
 279                  */
 280
 281         __u64   __reserved[123];        /* align to 1k */
 282
 283         /*
 284          * Control data for the mmap() data buffer.
 285          *
 286          * User-space reading the @data_head value should issue an rmb(), on
 287          * SMP capable platforms, after reading this value -- see
 288          * perf_event_wakeup().
 289          *
 290          * When the mapping is PROT_WRITE the @data_tail value should be
 291          * written by userspace to reflect the last read data. In this case
 292          * the kernel will not over-write unread data.
 293          */
 294         __u64   data_head;              /* head in the data section */
 295         __u64   data_tail;              /* user-space written tail */
 296 };
 297
 298 #define PERF_RECORD_MISC_CPUMODE_MASK           (3 << 0)
 299 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN                (0 << 0)
 300 #define PERF_RECORD_MISC_KERNEL                 (1 << 0)
 301 #define PERF_RECORD_MISC_USER                   (2 << 0)
 302 #define PERF_RECORD_MISC_HYPERVISOR             (3 << 0)
 303
 304 struct perf_event_header {
 305         __u32   type;
 306         __u16   misc;
 307         __u16   size;
 308 };
 309
 310 enum perf_event_type {
 311
 312         /*
 313          * The MMAP events record the PROT_EXEC mappings so that we can
 314          * correlate userspace IPs to code. They have the following structure:
 315          *
 316          * struct {
 317          *      struct perf_event_header        header;
 318          *
 319          *      u32                             pid, tid;
 320          *      u64                             addr;
 321          *      u64                             len;
 322          *      u64                             pgoff;
 323          *      char                            filename[];
 324          * };
 325          */
 326         PERF_RECORD_MMAP                        = 1,
 327
 328         /*
 329          * struct {
 330          *      struct perf_event_header        header;
 331          *      u64                             id;
 332          *      u64                             lost;
 333          * };
 334          */
 335         PERF_RECORD_LOST                        = 2,
 336
 337         /*
 338          * struct {
 339          *      struct perf_event_header        header;
 340          *
 341          *      u32                             pid, tid;
 342          *      char                            comm[];
 343          * };
 344          */
 345         PERF_RECORD_COMM                        = 3,
 346
 347         /*
 348          * struct {
 349          *      struct perf_event_header        header;
 350          *      u32                             pid, ppid;
 351          *      u32                             tid, ptid;
 352          *      u64                             time;
 353          * };
 354          */
 355         PERF_RECORD_EXIT                        = 4,
 356
 357         /*
 358          * struct {
 359          *      struct perf_event_header        header;
 360          *      u64                             time;
 361          *      u64                             id;
 362          *      u64                             stream_id;
 363          * };
 364          */
 365         PERF_RECORD_THROTTLE            = 5,
 366         PERF_RECORD_UNTHROTTLE          = 6,
 367
 368         /*
 369          * struct {
 370          *      struct perf_event_header        header;
 371          *      u32                             pid, ppid;
 372          *      u32                             tid, ptid;
 373          *      u64                             time;
 374          * };
 375          */
 376         PERF_RECORD_FORK                        = 7,
 377
 378         /*
 379          * struct {
 380          *      struct perf_event_header        header;
 381          *      u32                             pid, tid;
 382          *
 383          *      struct read_format              values;
 384          * };
 385          */
 386         PERF_RECORD_READ                        = 8,
 387
 388         /*
 389          * struct {
 390          *      struct perf_event_header        header;
 391          *
 392          *      { u64                   ip;       } && PERF_SAMPLE_IP
 393          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
 394          *      { u64                   time;     } && PERF_SAMPLE_TIME
 395          *      { u64                   addr;     } && PERF_SAMPLE_ADDR
 396          *      { u64                   id;       } && PERF_SAMPLE_ID
 397          *      { u64                   stream_id;} && PERF_SAMPLE_STREAM_ID
 398          *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
 399          *      { u64                   period;   } && PERF_SAMPLE_PERIOD
 400          *
 401          *      { struct read_format    values;   } && PERF_SAMPLE_READ
 402          *
 403          *      { u64                   nr,
 404          *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
 405          *
 406          *      #
 407          *      # The RAW record below is opaque data wrt the ABI
 408          *      #
 409          *      # That is, the ABI doesn't make any promises wrt to
 410          *      # the stability of its content, it may vary depending
 411          *      # on event, hardware, kernel version and phase of
 412          *      # the moon.
 413          *      #
 414          *      # In other words, PERF_SAMPLE_RAW contents are not an ABI.
 415          *      #
 416          *
 417          *      { u32                   size;
 418          *        char                  data[size];}&& PERF_SAMPLE_RAW
 419          * };
 420          */
 421         PERF_RECORD_SAMPLE              = 9,
 422
 423         PERF_RECORD_MAX,                        /* non-ABI */
 424 };
 425
 426 enum perf_callchain_context {
 427         PERF_CONTEXT_HV                 = (__u64)-32,
 428         PERF_CONTEXT_KERNEL             = (__u64)-128,
 429         PERF_CONTEXT_USER               = (__u64)-512,
 430
 431         PERF_CONTEXT_GUEST              = (__u64)-2048,
 432         PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
 433         PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
 434
 435         PERF_CONTEXT_MAX                = (__u64)-4095,
 436 };
 437
 438 #define PERF_FLAG_FD_NO_GROUP   (1U << 0)
 439 #define PERF_FLAG_FD_OUTPUT     (1U << 1)
 440
 441 #ifdef __KERNEL__
 442 /*
 443  * Kernel-internal data types and definitions:
 444  */
 445
 446 #ifdef CONFIG_PERF_EVENTS
 447 # include <asm/perf_event.h>
 448 #endif
 449
 450 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 451 #include <asm/hw_breakpoint.h>
 452 #endif
 453
 454 #include <linux/list.h>
 455 #include <linux/mutex.h>
 456 #include <linux/rculist.h>
 457 #include <linux/rcupdate.h>
 458 #include <linux/spinlock.h>
 459 #include <linux/hrtimer.h>
 460 #include <linux/fs.h>
 461 #include <linux/pid_namespace.h>
 462 #include <linux/workqueue.h>
 463 #include <asm/atomic.h>
 464
 465 #define PERF_MAX_STACK_DEPTH            255
 466
 467 struct perf_callchain_entry {
 468         __u64                           nr;
 469         __u64                           ip[PERF_MAX_STACK_DEPTH];
 470 };
 471
 472 struct perf_raw_record {
 473         u32                             size;
 474         void                            *data;
 475 };
 476
 477 struct task_struct;
 478
 479 /**
 480  * struct hw_perf_event - performance event hardware details:
 481  */
 482 struct hw_perf_event {
 483 #ifdef CONFIG_PERF_EVENTS
 484         union {
 485                 struct { /* hardware */
 486                         u64             config;
 487                         unsigned long   config_base;
 488                         unsigned long   event_base;
 489                         int             idx;
 490                 };
 491                 struct { /* software */
 492                         s64             remaining;
 493                         struct hrtimer  hrtimer;
 494                 };
 495 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 496                 union { /* breakpoint */
 497                         struct arch_hw_breakpoint       info;
 498                 };
 499 #endif
 500         };
 501         atomic64_t                      prev_count;
 502         u64                             sample_period;
 503         u64                             last_period;
 504         atomic64_t                      period_left;
 505         u64                             interrupts;
 506
 507         u64                             freq_count;
 508         u64                             freq_interrupts;
 509         u64                             freq_stamp;
 510 #endif
 511 };
 512
 513 struct perf_event;
 514
 515 /**
 516  * struct pmu - generic performance monitoring unit
 517  */
 518 struct pmu {
 519         int (*enable)                   (struct perf_event *event);
 520         void (*disable)                 (struct perf_event *event);
 521         void (*read)                    (struct perf_event *event);
 522         void (*unthrottle)              (struct perf_event *event);
 523 };
 524
 525 /**
 526  * enum perf_event_active_state - the states of a event
 527  */
 528 enum perf_event_active_state {
 529         PERF_EVENT_STATE_ERROR          = -2,
 530         PERF_EVENT_STATE_OFF            = -1,
 531         PERF_EVENT_STATE_INACTIVE       =  0,
 532         PERF_EVENT_STATE_ACTIVE         =  1,
 533 };
 534
 535 struct file;
 536
 537 struct perf_mmap_data {
 538         struct rcu_head                 rcu_head;
 539 #ifdef CONFIG_PERF_USE_VMALLOC
 540         struct work_struct              work;
 541 #endif
 542         int                             data_order;
 543         int                             nr_pages;       /* nr of data pages  */
 544         int                             writable;       /* are we writable   */
 545         int                             nr_locked;      /* nr pages mlocked  */
 546
 547         atomic_t                        poll;           /* POLL_ for wakeups */
 548         atomic_t                        events;         /* event_id limit       */
 549
 550         atomic_long_t                   head;           /* write position    */
 551         atomic_long_t                   done_head;      /* completed head    */
 552
 553         atomic_t                        lock;           /* concurrent writes */
 554         atomic_t                        wakeup;         /* needs a wakeup    */
 555         atomic_t                        lost;           /* nr records lost   */
 556
 557         long                            watermark;      /* wakeup watermark  */
 558
 559         struct perf_event_mmap_page     *user_page;
 560         void                            *data_pages[0];
 561 };
 562
 563 struct perf_pending_entry {
 564         struct perf_pending_entry *next;
 565         void (*func)(struct perf_pending_entry *);
 566 };
 567
 568 struct perf_sample_data;
 569
 570 typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
 571                                         struct perf_sample_data *,
 572                                         struct pt_regs *regs);
 573
 574 /**
 575  * struct perf_event - performance event kernel representation:
 576  */
 577 struct perf_event {
 578 #ifdef CONFIG_PERF_EVENTS
 579         struct list_head                group_entry;
 580         struct list_head                event_entry;
 581         struct list_head                sibling_list;
 582         int                             nr_siblings;
 583         struct perf_event               *group_leader;
 584         struct perf_event               *output;
 585         const struct pmu                *pmu;
 586
 587         enum perf_event_active_state    state;
 588         atomic64_t                      count;
 589
 590         /*
 591          * These are the total time in nanoseconds that the event
 592          * has been enabled (i.e. eligible to run, and the task has
 593          * been scheduled in, if this is a per-task event)
 594          * and running (scheduled onto the CPU), respectively.
 595          *
 596          * They are computed from tstamp_enabled, tstamp_running and
 597          * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
 598          */
 599         u64                             total_time_enabled;
 600         u64                             total_time_running;
 601
 602         /*
 603          * These are timestamps used for computing total_time_enabled
 604          * and total_time_running when the event is in INACTIVE or
 605          * ACTIVE state, measured in nanoseconds from an arbitrary point
 606          * in time.
 607          * tstamp_enabled: the notional time when the event was enabled
 608          * tstamp_running: the notional time when the event was scheduled on
 609          * tstamp_stopped: in INACTIVE state, the notional time when the
 610          *      event was scheduled off.
 611          */
 612         u64                             tstamp_enabled;
 613         u64                             tstamp_running;
 614         u64                             tstamp_stopped;
 615
 616         struct perf_event_attr          attr;
 617         struct hw_perf_event            hw;
 618
 619         struct perf_event_context       *ctx;
 620         struct file                     *filp;
 621
 622         /*
 623          * These accumulate total time (in nanoseconds) that children
 624          * events have been enabled and running, respectively.
 625          */
 626         atomic64_t                      child_total_time_enabled;
 627         atomic64_t                      child_total_time_running;
 628
 629         /*
 630          * Protect attach/detach and child_list:
 631          */
 632         struct mutex                    child_mutex;
 633         struct list_head                child_list;
 634         struct perf_event               *parent;
 635
 636         int                             oncpu;
 637         int                             cpu;
 638
 639         struct list_head                owner_entry;
 640         struct task_struct              *owner;
 641
 642         /* mmap bits */
 643         struct mutex                    mmap_mutex;
 644         atomic_t                        mmap_count;
 645         struct perf_mmap_data           *data;
 646
 647         /* poll related */
 648         wait_queue_head_t               waitq;
 649         struct fasync_struct            *fasync;
 650
 651         /* delayed work for NMIs and such */
 652         int                             pending_wakeup;
 653         int                             pending_kill;
 654         int                             pending_disable;
 655         struct perf_pending_entry       pending;
 656
 657         atomic_t                        event_limit;
 658
 659         void (*destroy)(struct perf_event *);
 660         struct rcu_head                 rcu_head;
 661
 662         struct pid_namespace            *ns;
 663         u64                             id;
 664
 665         perf_overflow_handler_t         overflow_handler;
 666
 667 #ifdef CONFIG_EVENT_PROFILE
 668         struct event_filter             *filter;
 669 #endif
 670
 671 #endif /* CONFIG_PERF_EVENTS */
 672 };
 673
 674 /**
 675  * struct perf_event_context - event context structure
 676  *
 677  * Used as a container for task events and CPU events as well:
 678  */
 679 struct perf_event_context {
 680         /*
 681          * Protect the states of the events in the list,
 682          * nr_active, and the list:
 683          */
 684         spinlock_t                      lock;
 685         /*
 686          * Protect the list of events.  Locking either mutex or lock
 687          * is sufficient to ensure the list doesn't change; to change
 688          * the list you need to lock both the mutex and the spinlock.
 689          */
 690         struct mutex                    mutex;
 691
 692         struct list_head                group_list;
 693         struct list_head                event_list;
 694         int                             nr_events;
 695         int                             nr_active;
 696         int                             is_active;
 697         int                             nr_stat;
 698         atomic_t                        refcount;
 699         struct task_struct              *task;
 700
 701         /*
 702          * Context clock, runs when context enabled.
 703          */
 704         u64                             time;
 705         u64                             timestamp;
 706
 707         /*
 708          * These fields let us detect when two contexts have both
 709          * been cloned (inherited) from a common ancestor.
 710          */
 711         struct perf_event_context       *parent_ctx;
 712         u64                             parent_gen;
 713         u64                             generation;
 714         int                             pin_count;
 715         struct rcu_head                 rcu_head;
 716 };
 717
 718 /**
 719  * struct perf_event_cpu_context - per cpu event context structure
 720  */
 721 struct perf_cpu_context {
 722         struct perf_event_context       ctx;
 723         struct perf_event_context       *task_ctx;
 724         int                             active_oncpu;
 725         int                             max_pertask;
 726         int                             exclusive;
 727
 728         /*
 729          * Recursion avoidance:
 730          *
 731          * task, softirq, irq, nmi context
 732          */
 733         int                             recursion[4];
 734 };
 735
 736 struct perf_output_handle {
 737         struct perf_event               *event;
 738         struct perf_mmap_data           *data;
 739         unsigned long                   head;
 740         unsigned long                   offset;
 741         int                             nmi;
 742         int                             sample;
 743         int                             locked;
 744 };
 745
 746 #ifdef CONFIG_PERF_EVENTS
 747
 748 /*
 749  * Set by architecture code:
 750  */
 751 extern int perf_max_events;
 752
 753 extern const struct pmu *hw_perf_event_init(struct perf_event *event);
 754
 755 extern void perf_event_task_sched_in(struct task_struct *task, int cpu);
 756 extern void perf_event_task_sched_out(struct task_struct *task,
 757                                         struct task_struct *next, int cpu);
 758 extern void perf_event_task_tick(struct task_struct *task, int cpu);
 759 extern int perf_event_init_task(struct task_struct *child);
 760 extern void perf_event_exit_task(struct task_struct *child);
 761 extern void perf_event_free_task(struct task_struct *task);
 762 extern void set_perf_event_pending(void);
 763 extern void perf_event_do_pending(void);
 764 extern void perf_event_print_debug(void);
 765 extern void __perf_disable(void);
 766 extern bool __perf_enable(void);
 767 extern void perf_disable(void);
 768 extern void perf_enable(void);
 769 extern int perf_event_task_disable(void);
 770 extern int perf_event_task_enable(void);
 771 extern int hw_perf_group_sched_in(struct perf_event *group_leader,
 772                struct perf_cpu_context *cpuctx,
 773                struct perf_event_context *ctx, int cpu);
 774 extern void perf_event_update_userpage(struct perf_event *event);
 775 extern int perf_event_release_kernel(struct perf_event *event);
 776 extern struct perf_event *
 777 perf_event_create_kernel_counter(struct perf_event_attr *attr,
 778                                 int cpu,
 779                                 pid_t pid,
 780                                 perf_overflow_handler_t callback);
 781 extern u64 perf_event_read_value(struct perf_event *event,
 782                                  u64 *enabled, u64 *running);
 783
 784 struct perf_sample_data {
 785         u64                             type;
 786
 787         u64                             ip;
 788         struct {
 789                 u32     pid;
 790                 u32     tid;
 791         }                               tid_entry;
 792         u64                             time;
 793         u64                             addr;
 794         u64                             id;
 795         u64                             stream_id;
 796         struct {
 797                 u32     cpu;
 798                 u32     reserved;
 799         }                               cpu_entry;
 800         u64                             period;
 801         struct perf_callchain_entry     *callchain;
 802         struct perf_raw_record          *raw;
 803 };
 804
 805 extern void perf_output_sample(struct perf_output_handle *handle,
 806                                struct perf_event_header *header,
 807                                struct perf_sample_data *data,
 808                                struct perf_event *event);
 809 extern void perf_prepare_sample(struct perf_event_header *header,
 810                                 struct perf_sample_data *data,
 811                                 struct perf_event *event,
 812                                 struct pt_regs *regs);
 813
 814 extern int perf_event_overflow(struct perf_event *event, int nmi,
 815                                  struct perf_sample_data *data,
 816                                  struct pt_regs *regs);
 817
 818 /*
 819  * Return 1 for a software event, 0 for a hardware event
 820  */
 821 static inline int is_software_event(struct perf_event *event)
 822 {
 823         return (event->attr.type != PERF_TYPE_RAW) &&
 824                 (event->attr.type != PERF_TYPE_HARDWARE) &&
 825                 (event->attr.type != PERF_TYPE_HW_CACHE);
 826 }
 827
 828 extern atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX];
 829
 830 extern void __perf_sw_event(u32, u64, int, struct pt_regs *, u64);
 831
 832 static inline void
 833 perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
 834 {
 835         if (atomic_read(&perf_swevent_enabled[event_id]))
 836                 __perf_sw_event(event_id, nr, nmi, regs, addr);
 837 }
 838
 839 extern void __perf_event_mmap(struct vm_area_struct *vma);
 840
 841 static inline void perf_event_mmap(struct vm_area_struct *vma)
 842 {
 843         if (vma->vm_flags & VM_EXEC)
 844                 __perf_event_mmap(vma);
 845 }
 846
 847 extern void perf_event_comm(struct task_struct *tsk);
 848 extern void perf_event_fork(struct task_struct *tsk);
 849
 850 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 851
 852 extern int sysctl_perf_event_paranoid;
 853 extern int sysctl_perf_event_mlock;
 854 extern int sysctl_perf_event_sample_rate;
 855
 856 extern void perf_event_init(void);
 857 extern void perf_tp_event(int event_id, u64 addr, u64 count,
 858                                  void *record, int entry_size);
 859 extern void perf_bp_event(struct perf_event *event, void *data);
 860
 861 #ifndef perf_misc_flags
 862 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_RECORD_MISC_USER : \
 863                                  PERF_RECORD_MISC_KERNEL)
 864 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
 865 #endif
 866
 867 extern int perf_output_begin(struct perf_output_handle *handle,
 868                              struct perf_event *event, unsigned int size,
 869                              int nmi, int sample);
 870 extern void perf_output_end(struct perf_output_handle *handle);
 871 extern void perf_output_copy(struct perf_output_handle *handle,
 872                              const void *buf, unsigned int len);
 873 extern int perf_swevent_get_recursion_context(void);
 874 extern void perf_swevent_put_recursion_context(int rctx);
 875 extern void perf_event_enable(struct perf_event *event);
 876 extern void perf_event_disable(struct perf_event *event);
 877 #else
 878 static inline void
 879 perf_event_task_sched_in(struct task_struct *task, int cpu)             { }
 880 static inline void
 881 perf_event_task_sched_out(struct task_struct *task,
 882                             struct task_struct *next, int cpu)          { }
 883 static inline void
 884 perf_event_task_tick(struct task_struct *task, int cpu)                 { }
 885 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
 886 static inline void perf_event_exit_task(struct task_struct *child)      { }
 887 static inline void perf_event_free_task(struct task_struct *task)       { }
 888 static inline void perf_event_do_pending(void)                          { }
 889 static inline void perf_event_print_debug(void)                         { }
 890 static inline void perf_disable(void)                                   { }
 891 static inline void perf_enable(void)                                    { }
 892 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
 893 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
 894
 895 static inline void
 896 perf_sw_event(u32 event_id, u64 nr, int nmi,
 897                      struct pt_regs *regs, u64 addr)                    { }
 898 static inline void
 899 perf_bp_event(struct perf_event *event, void *data)             { }
 900
 901 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
 902 static inline void perf_event_comm(struct task_struct *tsk)             { }
 903 static inline void perf_event_fork(struct task_struct *tsk)             { }
 904 static inline void perf_event_init(void)                                { }
 905 static inline int  perf_swevent_get_recursion_context(void)  { return -1; }
 906 static inline void perf_swevent_put_recursion_context(int rctx)         { }
 907 static inline void perf_event_enable(struct perf_event *event)          { }
 908 static inline void perf_event_disable(struct perf_event *event)         { }
 909 #endif
 910
 911 #define perf_output_put(handle, x) \
 912         perf_output_copy((handle), &(x), sizeof(x))
 913
 914 #endif /* __KERNEL__ */
 915 #endif /* _LINUX_PERF_EVENT_H */