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