include/linux/perf_counter.h

   1 /*
   2  *  Performance counters:
   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_COUNTER_H
  15 #define _LINUX_PERF_COUNTER_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
  35         PERF_TYPE_MAX,                          /* non-ABI */
  36 };
  37
  38 /*
  39  * Generalized performance counter event types, used by the
  40  * attr.event_id parameter of the sys_perf_counter_open()
  41  * syscall:
  42  */
  43 enum perf_hw_id {
  44         /*
  45          * Common hardware events, generalized by the kernel:
  46          */
  47         PERF_COUNT_HW_CPU_CYCLES                = 0,
  48         PERF_COUNT_HW_INSTRUCTIONS              = 1,
  49         PERF_COUNT_HW_CACHE_REFERENCES          = 2,
  50         PERF_COUNT_HW_CACHE_MISSES              = 3,
  51         PERF_COUNT_HW_BRANCH_INSTRUCTIONS       = 4,
  52         PERF_COUNT_HW_BRANCH_MISSES             = 5,
  53         PERF_COUNT_HW_BUS_CYCLES                = 6,
  54
  55         PERF_COUNT_HW_MAX,                      /* non-ABI */
  56 };
  57
  58 /*
  59  * Generalized hardware cache counters:
  60  *
  61  *       { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
  62  *       { read, write, prefetch } x
  63  *       { accesses, misses }
  64  */
  65 enum perf_hw_cache_id {
  66         PERF_COUNT_HW_CACHE_L1D                 = 0,
  67         PERF_COUNT_HW_CACHE_L1I                 = 1,
  68         PERF_COUNT_HW_CACHE_LL                  = 2,
  69         PERF_COUNT_HW_CACHE_DTLB                = 3,
  70         PERF_COUNT_HW_CACHE_ITLB                = 4,
  71         PERF_COUNT_HW_CACHE_BPU                 = 5,
  72
  73         PERF_COUNT_HW_CACHE_MAX,                /* non-ABI */
  74 };
  75
  76 enum perf_hw_cache_op_id {
  77         PERF_COUNT_HW_CACHE_OP_READ             = 0,
  78         PERF_COUNT_HW_CACHE_OP_WRITE            = 1,
  79         PERF_COUNT_HW_CACHE_OP_PREFETCH         = 2,
  80
  81         PERF_COUNT_HW_CACHE_OP_MAX,             /* non-ABI */
  82 };
  83
  84 enum perf_hw_cache_op_result_id {
  85         PERF_COUNT_HW_CACHE_RESULT_ACCESS       = 0,
  86         PERF_COUNT_HW_CACHE_RESULT_MISS         = 1,
  87
  88         PERF_COUNT_HW_CACHE_RESULT_MAX,         /* non-ABI */
  89 };
  90
  91 /*
  92  * Special "software" counters provided by the kernel, even if the hardware
  93  * does not support performance counters. These counters measure various
  94  * physical and sw events of the kernel (and allow the profiling of them as
  95  * well):
  96  */
  97 enum perf_sw_ids {
  98         PERF_COUNT_SW_CPU_CLOCK                 = 0,
  99         PERF_COUNT_SW_TASK_CLOCK                = 1,
 100         PERF_COUNT_SW_PAGE_FAULTS               = 2,
 101         PERF_COUNT_SW_CONTEXT_SWITCHES          = 3,
 102         PERF_COUNT_SW_CPU_MIGRATIONS            = 4,
 103         PERF_COUNT_SW_PAGE_FAULTS_MIN           = 5,
 104         PERF_COUNT_SW_PAGE_FAULTS_MAJ           = 6,
 105
 106         PERF_COUNT_SW_MAX,                      /* non-ABI */
 107 };
 108
 109 /*
 110  * Bits that can be set in attr.sample_type to request information
 111  * in the overflow packets.
 112  */
 113 enum perf_counter_sample_format {
 114         PERF_SAMPLE_IP                          = 1U << 0,
 115         PERF_SAMPLE_TID                         = 1U << 1,
 116         PERF_SAMPLE_TIME                        = 1U << 2,
 117         PERF_SAMPLE_ADDR                        = 1U << 3,
 118         PERF_SAMPLE_READ                        = 1U << 4,
 119         PERF_SAMPLE_CALLCHAIN                   = 1U << 5,
 120         PERF_SAMPLE_ID                          = 1U << 6,
 121         PERF_SAMPLE_CPU                         = 1U << 7,
 122         PERF_SAMPLE_PERIOD                      = 1U << 8,
 123         PERF_SAMPLE_STREAM_ID                   = 1U << 9,
 124         PERF_SAMPLE_RAW                         = 1U << 10,
 125
 126         PERF_SAMPLE_MAX = 1U << 11,             /* non-ABI */
 127 };
 128
 129 /*
 130  * The format of the data returned by read() on a perf counter fd,
 131  * as specified by attr.read_format:
 132  *
 133  * struct read_format {
 134  *      { u64           value;
 135  *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
 136  *        { u64         time_running; } && PERF_FORMAT_RUNNING
 137  *        { u64         id;           } && PERF_FORMAT_ID
 138  *      } && !PERF_FORMAT_GROUP
 139  *
 140  *      { u64           nr;
 141  *        { u64         time_enabled; } && PERF_FORMAT_ENABLED
 142  *        { u64         time_running; } && PERF_FORMAT_RUNNING
 143  *        { u64         value;
 144  *          { u64       id;           } && PERF_FORMAT_ID
 145  *        }             cntr[nr];
 146  *      } && PERF_FORMAT_GROUP
 147  * };
 148  */
 149 enum perf_counter_read_format {
 150         PERF_FORMAT_TOTAL_TIME_ENABLED          = 1U << 0,
 151         PERF_FORMAT_TOTAL_TIME_RUNNING          = 1U << 1,
 152         PERF_FORMAT_ID                          = 1U << 2,
 153         PERF_FORMAT_GROUP                       = 1U << 3,
 154
 155         PERF_FORMAT_MAX = 1U << 4,              /* non-ABI */
 156 };
 157
 158 #define PERF_ATTR_SIZE_VER0     64      /* sizeof first published struct */
 159
 160 /*
 161  * Hardware event to monitor via a performance monitoring counter:
 162  */
 163 struct perf_counter_attr {
 164
 165         /*
 166          * Major type: hardware/software/tracepoint/etc.
 167          */
 168         __u32                   type;
 169
 170         /*
 171          * Size of the attr structure, for fwd/bwd compat.
 172          */
 173         __u32                   size;
 174
 175         /*
 176          * Type specific configuration information.
 177          */
 178         __u64                   config;
 179
 180         union {
 181                 __u64           sample_period;
 182                 __u64           sample_freq;
 183         };
 184
 185         __u64                   sample_type;
 186         __u64                   read_format;
 187
 188         __u64                   disabled       :  1, /* off by default        */
 189                                 inherit        :  1, /* children inherit it   */
 190                                 pinned         :  1, /* must always be on PMU */
 191                                 exclusive      :  1, /* only group on PMU     */
 192                                 exclude_user   :  1, /* don't count user      */
 193                                 exclude_kernel :  1, /* ditto kernel          */
 194                                 exclude_hv     :  1, /* ditto hypervisor      */
 195                                 exclude_idle   :  1, /* don't count when idle */
 196                                 mmap           :  1, /* include mmap data     */
 197                                 comm           :  1, /* include comm data     */
 198                                 freq           :  1, /* use freq, not period  */
 199                                 inherit_stat   :  1, /* per task counts       */
 200                                 enable_on_exec :  1, /* next exec enables     */
 201                                 task           :  1, /* trace fork/exit       */
 202
 203                                 __reserved_1   : 50;
 204
 205         __u32                   wakeup_events;  /* wakeup every n events */
 206         __u32                   __reserved_2;
 207
 208         __u64                   __reserved_3;
 209 };
 210
 211 /*
 212  * Ioctls that can be done on a perf counter fd:
 213  */
 214 #define PERF_COUNTER_IOC_ENABLE         _IO ('$', 0)
 215 #define PERF_COUNTER_IOC_DISABLE        _IO ('$', 1)
 216 #define PERF_COUNTER_IOC_REFRESH        _IO ('$', 2)
 217 #define PERF_COUNTER_IOC_RESET          _IO ('$', 3)
 218 #define PERF_COUNTER_IOC_PERIOD         _IOW('$', 4, u64)
 219
 220 enum perf_counter_ioc_flags {
 221         PERF_IOC_FLAG_GROUP             = 1U << 0,
 222 };
 223
 224 /*
 225  * Structure of the page that can be mapped via mmap
 226  */
 227 struct perf_counter_mmap_page {
 228         __u32   version;                /* version number of this structure */
 229         __u32   compat_version;         /* lowest version this is compat with */
 230
 231         /*
 232          * Bits needed to read the hw counters in user-space.
 233          *
 234          *   u32 seq;
 235          *   s64 count;
 236          *
 237          *   do {
 238          *     seq = pc->lock;
 239          *
 240          *     barrier()
 241          *     if (pc->index) {
 242          *       count = pmc_read(pc->index - 1);
 243          *       count += pc->offset;
 244          *     } else
 245          *       goto regular_read;
 246          *
 247          *     barrier();
 248          *   } while (pc->lock != seq);
 249          *
 250          * NOTE: for obvious reason this only works on self-monitoring
 251          *       processes.
 252          */
 253         __u32   lock;                   /* seqlock for synchronization */
 254         __u32   index;                  /* hardware counter identifier */
 255         __s64   offset;                 /* add to hardware counter value */
 256         __u64   time_enabled;           /* time counter active */
 257         __u64   time_running;           /* time counter on cpu */
 258
 259                 /*
 260                  * Hole for extension of the self monitor capabilities
 261                  */
 262
 263         __u64   __reserved[123];        /* align to 1k */
 264
 265         /*
 266          * Control data for the mmap() data buffer.
 267          *
 268          * User-space reading the @data_head value should issue an rmb(), on
 269          * SMP capable platforms, after reading this value -- see
 270          * perf_counter_wakeup().
 271          *
 272          * When the mapping is PROT_WRITE the @data_tail value should be
 273          * written by userspace to reflect the last read data. In this case
 274          * the kernel will not over-write unread data.
 275          */
 276         __u64   data_head;              /* head in the data section */
 277         __u64   data_tail;              /* user-space written tail */
 278 };
 279
 280 #define PERF_EVENT_MISC_CPUMODE_MASK            (3 << 0)
 281 #define PERF_EVENT_MISC_CPUMODE_UNKNOWN         (0 << 0)
 282 #define PERF_EVENT_MISC_KERNEL                  (1 << 0)
 283 #define PERF_EVENT_MISC_USER                    (2 << 0)
 284 #define PERF_EVENT_MISC_HYPERVISOR              (3 << 0)
 285
 286 struct perf_event_header {
 287         __u32   type;
 288         __u16   misc;
 289         __u16   size;
 290 };
 291
 292 enum perf_event_type {
 293
 294         /*
 295          * The MMAP events record the PROT_EXEC mappings so that we can
 296          * correlate userspace IPs to code. They have the following structure:
 297          *
 298          * struct {
 299          *      struct perf_event_header        header;
 300          *
 301          *      u32                             pid, tid;
 302          *      u64                             addr;
 303          *      u64                             len;
 304          *      u64                             pgoff;
 305          *      char                            filename[];
 306          * };
 307          */
 308         PERF_EVENT_MMAP                 = 1,
 309
 310         /*
 311          * struct {
 312          *      struct perf_event_header        header;
 313          *      u64                             id;
 314          *      u64                             lost;
 315          * };
 316          */
 317         PERF_EVENT_LOST                 = 2,
 318
 319         /*
 320          * struct {
 321          *      struct perf_event_header        header;
 322          *
 323          *      u32                             pid, tid;
 324          *      char                            comm[];
 325          * };
 326          */
 327         PERF_EVENT_COMM                 = 3,
 328
 329         /*
 330          * struct {
 331          *      struct perf_event_header        header;
 332          *      u32                             pid, ppid;
 333          *      u32                             tid, ptid;
 334          * };
 335          */
 336         PERF_EVENT_EXIT                 = 4,
 337
 338         /*
 339          * struct {
 340          *      struct perf_event_header        header;
 341          *      u64                             time;
 342          *      u64                             id;
 343          *      u64                             stream_id;
 344          * };
 345          */
 346         PERF_EVENT_THROTTLE             = 5,
 347         PERF_EVENT_UNTHROTTLE           = 6,
 348
 349         /*
 350          * struct {
 351          *      struct perf_event_header        header;
 352          *      u32                             pid, ppid;
 353          *      u32                             tid, ptid;
 354          * };
 355          */
 356         PERF_EVENT_FORK                 = 7,
 357
 358         /*
 359          * struct {
 360          *      struct perf_event_header        header;
 361          *      u32                             pid, tid;
 362          *
 363          *      struct read_format              values;
 364          * };
 365          */
 366         PERF_EVENT_READ                 = 8,
 367
 368         /*
 369          * struct {
 370          *      struct perf_event_header        header;
 371          *
 372          *      { u64                   ip;       } && PERF_SAMPLE_IP
 373          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
 374          *      { u64                   time;     } && PERF_SAMPLE_TIME
 375          *      { u64                   addr;     } && PERF_SAMPLE_ADDR
 376          *      { u64                   id;       } && PERF_SAMPLE_ID
 377          *      { u64                   stream_id;} && PERF_SAMPLE_STREAM_ID
 378          *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
 379          *      { u64                   period;   } && PERF_SAMPLE_PERIOD
 380          *
 381          *      { struct read_format    values;   } && PERF_SAMPLE_READ
 382          *
 383          *      { u64                   nr,
 384          *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
 385          *
 386          *      #
 387          *      # The RAW record below is opaque data wrt the ABI
 388          *      #
 389          *      # That is, the ABI doesn't make any promises wrt to
 390          *      # the stability of its content, it may vary depending
 391          *      # on event, hardware, kernel version and phase of
 392          *      # the moon.
 393          *      #
 394          *      # In other words, PERF_SAMPLE_RAW contents are not an ABI.
 395          *      #
 396          *
 397          *      { u32                   size;
 398          *        char                  data[size];}&& PERF_SAMPLE_RAW
 399          * };
 400          */
 401         PERF_EVENT_SAMPLE               = 9,
 402
 403         PERF_EVENT_MAX,                 /* non-ABI */
 404 };
 405
 406 enum perf_callchain_context {
 407         PERF_CONTEXT_HV                 = (__u64)-32,
 408         PERF_CONTEXT_KERNEL             = (__u64)-128,
 409         PERF_CONTEXT_USER               = (__u64)-512,
 410
 411         PERF_CONTEXT_GUEST              = (__u64)-2048,
 412         PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
 413         PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
 414
 415         PERF_CONTEXT_MAX                = (__u64)-4095,
 416 };
 417
 418 #ifdef __KERNEL__
 419 /*
 420  * Kernel-internal data types and definitions:
 421  */
 422
 423 #ifdef CONFIG_PERF_COUNTERS
 424 # include <asm/perf_counter.h>
 425 #endif
 426
 427 #include <linux/list.h>
 428 #include <linux/mutex.h>
 429 #include <linux/rculist.h>
 430 #include <linux/rcupdate.h>
 431 #include <linux/spinlock.h>
 432 #include <linux/hrtimer.h>
 433 #include <linux/fs.h>
 434 #include <linux/pid_namespace.h>
 435 #include <asm/atomic.h>
 436
 437 #define PERF_MAX_STACK_DEPTH            255
 438
 439 struct perf_callchain_entry {
 440         __u64                           nr;
 441         __u64                           ip[PERF_MAX_STACK_DEPTH];
 442 };
 443
 444 struct perf_raw_record {
 445         u32                             size;
 446         void                            *data;
 447 };
 448
 449 struct task_struct;
 450
 451 /**
 452  * struct hw_perf_counter - performance counter hardware details:
 453  */
 454 struct hw_perf_counter {
 455 #ifdef CONFIG_PERF_COUNTERS
 456         union {
 457                 struct { /* hardware */
 458                         u64             config;
 459                         unsigned long   config_base;
 460                         unsigned long   counter_base;
 461                         int             idx;
 462                 };
 463                 union { /* software */
 464                         atomic64_t      count;
 465                         struct hrtimer  hrtimer;
 466                 };
 467         };
 468         atomic64_t                      prev_count;
 469         u64                             sample_period;
 470         u64                             last_period;
 471         atomic64_t                      period_left;
 472         u64                             interrupts;
 473
 474         u64                             freq_count;
 475         u64                             freq_interrupts;
 476         u64                             freq_stamp;
 477 #endif
 478 };
 479
 480 struct perf_counter;
 481
 482 /**
 483  * struct pmu - generic performance monitoring unit
 484  */
 485 struct pmu {
 486         int (*enable)                   (struct perf_counter *counter);
 487         void (*disable)                 (struct perf_counter *counter);
 488         void (*read)                    (struct perf_counter *counter);
 489         void (*unthrottle)              (struct perf_counter *counter);
 490 };
 491
 492 /**
 493  * enum perf_counter_active_state - the states of a counter
 494  */
 495 enum perf_counter_active_state {
 496         PERF_COUNTER_STATE_ERROR        = -2,
 497         PERF_COUNTER_STATE_OFF          = -1,
 498         PERF_COUNTER_STATE_INACTIVE     =  0,
 499         PERF_COUNTER_STATE_ACTIVE       =  1,
 500 };
 501
 502 struct file;
 503
 504 struct perf_mmap_data {
 505         struct rcu_head                 rcu_head;
 506         int                             nr_pages;       /* nr of data pages  */
 507         int                             writable;       /* are we writable   */
 508         int                             nr_locked;      /* nr pages mlocked  */
 509
 510         atomic_t                        poll;           /* POLL_ for wakeups */
 511         atomic_t                        events;         /* event limit       */
 512
 513         atomic_long_t                   head;           /* write position    */
 514         atomic_long_t                   done_head;      /* completed head    */
 515
 516         atomic_t                        lock;           /* concurrent writes */
 517         atomic_t                        wakeup;         /* needs a wakeup    */
 518         atomic_t                        lost;           /* nr records lost   */
 519
 520         struct perf_counter_mmap_page   *user_page;
 521         void                            *data_pages[0];
 522 };
 523
 524 struct perf_pending_entry {
 525         struct perf_pending_entry *next;
 526         void (*func)(struct perf_pending_entry *);
 527 };
 528
 529 /**
 530  * struct perf_counter - performance counter kernel representation:
 531  */
 532 struct perf_counter {
 533 #ifdef CONFIG_PERF_COUNTERS
 534         struct list_head                list_entry;
 535         struct list_head                event_entry;
 536         struct list_head                sibling_list;
 537         int                             nr_siblings;
 538         struct perf_counter             *group_leader;
 539         const struct pmu                *pmu;
 540
 541         enum perf_counter_active_state  state;
 542         atomic64_t                      count;
 543
 544         /*
 545          * These are the total time in nanoseconds that the counter
 546          * has been enabled (i.e. eligible to run, and the task has
 547          * been scheduled in, if this is a per-task counter)
 548          * and running (scheduled onto the CPU), respectively.
 549          *
 550          * They are computed from tstamp_enabled, tstamp_running and
 551          * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
 552          */
 553         u64                             total_time_enabled;
 554         u64                             total_time_running;
 555
 556         /*
 557          * These are timestamps used for computing total_time_enabled
 558          * and total_time_running when the counter is in INACTIVE or
 559          * ACTIVE state, measured in nanoseconds from an arbitrary point
 560          * in time.
 561          * tstamp_enabled: the notional time when the counter was enabled
 562          * tstamp_running: the notional time when the counter was scheduled on
 563          * tstamp_stopped: in INACTIVE state, the notional time when the
 564          *      counter was scheduled off.
 565          */
 566         u64                             tstamp_enabled;
 567         u64                             tstamp_running;
 568         u64                             tstamp_stopped;
 569
 570         struct perf_counter_attr        attr;
 571         struct hw_perf_counter          hw;
 572
 573         struct perf_counter_context     *ctx;
 574         struct file                     *filp;
 575
 576         /*
 577          * These accumulate total time (in nanoseconds) that children
 578          * counters have been enabled and running, respectively.
 579          */
 580         atomic64_t                      child_total_time_enabled;
 581         atomic64_t                      child_total_time_running;
 582
 583         /*
 584          * Protect attach/detach and child_list:
 585          */
 586         struct mutex                    child_mutex;
 587         struct list_head                child_list;
 588         struct perf_counter             *parent;
 589
 590         int                             oncpu;
 591         int                             cpu;
 592
 593         struct list_head                owner_entry;
 594         struct task_struct              *owner;
 595
 596         /* mmap bits */
 597         struct mutex                    mmap_mutex;
 598         atomic_t                        mmap_count;
 599         struct perf_mmap_data           *data;
 600
 601         /* poll related */
 602         wait_queue_head_t               waitq;
 603         struct fasync_struct            *fasync;
 604
 605         /* delayed work for NMIs and such */
 606         int                             pending_wakeup;
 607         int                             pending_kill;
 608         int                             pending_disable;
 609         struct perf_pending_entry       pending;
 610
 611         atomic_t                        event_limit;
 612
 613         void (*destroy)(struct perf_counter *);
 614         struct rcu_head                 rcu_head;
 615
 616         struct pid_namespace            *ns;
 617         u64                             id;
 618 #endif
 619 };
 620
 621 /**
 622  * struct perf_counter_context - counter context structure
 623  *
 624  * Used as a container for task counters and CPU counters as well:
 625  */
 626 struct perf_counter_context {
 627         /*
 628          * Protect the states of the counters in the list,
 629          * nr_active, and the list:
 630          */
 631         spinlock_t                      lock;
 632         /*
 633          * Protect the list of counters.  Locking either mutex or lock
 634          * is sufficient to ensure the list doesn't change; to change
 635          * the list you need to lock both the mutex and the spinlock.
 636          */
 637         struct mutex                    mutex;
 638
 639         struct list_head                counter_list;
 640         struct list_head                event_list;
 641         int                             nr_counters;
 642         int                             nr_active;
 643         int                             is_active;
 644         int                             nr_stat;
 645         atomic_t                        refcount;
 646         struct task_struct              *task;
 647
 648         /*
 649          * Context clock, runs when context enabled.
 650          */
 651         u64                             time;
 652         u64                             timestamp;
 653
 654         /*
 655          * These fields let us detect when two contexts have both
 656          * been cloned (inherited) from a common ancestor.
 657          */
 658         struct perf_counter_context     *parent_ctx;
 659         u64                             parent_gen;
 660         u64                             generation;
 661         int                             pin_count;
 662         struct rcu_head                 rcu_head;
 663 };
 664
 665 /**
 666  * struct perf_counter_cpu_context - per cpu counter context structure
 667  */
 668 struct perf_cpu_context {
 669         struct perf_counter_context     ctx;
 670         struct perf_counter_context     *task_ctx;
 671         int                             active_oncpu;
 672         int                             max_pertask;
 673         int                             exclusive;
 674
 675         /*
 676          * Recursion avoidance:
 677          *
 678          * task, softirq, irq, nmi context
 679          */
 680         int                             recursion[4];
 681 };
 682
 683 #ifdef CONFIG_PERF_COUNTERS
 684
 685 /*
 686  * Set by architecture code:
 687  */
 688 extern int perf_max_counters;
 689
 690 extern const struct pmu *hw_perf_counter_init(struct perf_counter *counter);
 691
 692 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
 693 extern void perf_counter_task_sched_out(struct task_struct *task,
 694                                         struct task_struct *next, int cpu);
 695 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
 696 extern int perf_counter_init_task(struct task_struct *child);
 697 extern void perf_counter_exit_task(struct task_struct *child);
 698 extern void perf_counter_free_task(struct task_struct *task);
 699 extern void set_perf_counter_pending(void);
 700 extern void perf_counter_do_pending(void);
 701 extern void perf_counter_print_debug(void);
 702 extern void __perf_disable(void);
 703 extern bool __perf_enable(void);
 704 extern void perf_disable(void);
 705 extern void perf_enable(void);
 706 extern int perf_counter_task_disable(void);
 707 extern int perf_counter_task_enable(void);
 708 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
 709                struct perf_cpu_context *cpuctx,
 710                struct perf_counter_context *ctx, int cpu);
 711 extern void perf_counter_update_userpage(struct perf_counter *counter);
 712
 713 struct perf_sample_data {
 714         struct pt_regs                  *regs;
 715         u64                             addr;
 716         u64                             period;
 717         struct perf_raw_record          *raw;
 718 };
 719
 720 extern int perf_counter_overflow(struct perf_counter *counter, int nmi,
 721                                  struct perf_sample_data *data);
 722 extern void perf_counter_output(struct perf_counter *counter, int nmi,
 723                                 struct perf_sample_data *data);
 724
 725 /*
 726  * Return 1 for a software counter, 0 for a hardware counter
 727  */
 728 static inline int is_software_counter(struct perf_counter *counter)
 729 {
 730         return (counter->attr.type != PERF_TYPE_RAW) &&
 731                 (counter->attr.type != PERF_TYPE_HARDWARE) &&
 732                 (counter->attr.type != PERF_TYPE_HW_CACHE);
 733 }
 734
 735 extern atomic_t perf_swcounter_enabled[PERF_COUNT_SW_MAX];
 736
 737 extern void __perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
 738
 739 static inline void
 740 perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
 741 {
 742         if (atomic_read(&perf_swcounter_enabled[event]))
 743                 __perf_swcounter_event(event, nr, nmi, regs, addr);
 744 }
 745
 746 extern void __perf_counter_mmap(struct vm_area_struct *vma);
 747
 748 static inline void perf_counter_mmap(struct vm_area_struct *vma)
 749 {
 750         if (vma->vm_flags & VM_EXEC)
 751                 __perf_counter_mmap(vma);
 752 }
 753
 754 extern void perf_counter_comm(struct task_struct *tsk);
 755 extern void perf_counter_fork(struct task_struct *tsk);
 756
 757 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 758
 759 extern int sysctl_perf_counter_paranoid;
 760 extern int sysctl_perf_counter_mlock;
 761 extern int sysctl_perf_counter_sample_rate;
 762
 763 extern void perf_counter_init(void);
 764
 765 #ifndef perf_misc_flags
 766 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_EVENT_MISC_USER : \
 767                                  PERF_EVENT_MISC_KERNEL)
 768 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
 769 #endif
 770
 771 #else
 772 static inline void
 773 perf_counter_task_sched_in(struct task_struct *task, int cpu)           { }
 774 static inline void
 775 perf_counter_task_sched_out(struct task_struct *task,
 776                             struct task_struct *next, int cpu)          { }
 777 static inline void
 778 perf_counter_task_tick(struct task_struct *task, int cpu)               { }
 779 static inline int perf_counter_init_task(struct task_struct *child)     { return 0; }
 780 static inline void perf_counter_exit_task(struct task_struct *child)    { }
 781 static inline void perf_counter_free_task(struct task_struct *task)     { }
 782 static inline void perf_counter_do_pending(void)                        { }
 783 static inline void perf_counter_print_debug(void)                       { }
 784 static inline void perf_disable(void)                                   { }
 785 static inline void perf_enable(void)                                    { }
 786 static inline int perf_counter_task_disable(void)       { return -EINVAL; }
 787 static inline int perf_counter_task_enable(void)        { return -EINVAL; }
 788
 789 static inline void
 790 perf_swcounter_event(u32 event, u64 nr, int nmi,
 791                      struct pt_regs *regs, u64 addr)                    { }
 792
 793 static inline void perf_counter_mmap(struct vm_area_struct *vma)        { }
 794 static inline void perf_counter_comm(struct task_struct *tsk)           { }
 795 static inline void perf_counter_fork(struct task_struct *tsk)           { }
 796 static inline void perf_counter_init(void)                              { }
 797 #endif
 798
 799 #endif /* __KERNEL__ */
 800 #endif /* _LINUX_PERF_COUNTER_H */