SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
 124         PERF_SAMPLE_MAX = 1U << 9,              /* non-ABI */
 125 };
 126
 127 /*
 128  * Bits that can be set in attr.read_format to request that
 129  * reads on the counter should return the indicated quantities,
 130  * in increasing order of bit value, after the counter value.
 131  */
 132 enum perf_counter_read_format {
 133         PERF_FORMAT_TOTAL_TIME_ENABLED          = 1U << 0,
 134         PERF_FORMAT_TOTAL_TIME_RUNNING          = 1U << 1,
 135         PERF_FORMAT_ID                          = 1U << 2,
 136
 137         PERF_FORMAT_MAX = 1U << 3,              /* non-ABI */
 138 };
 139
 140 #define PERF_ATTR_SIZE_VER0     64      /* sizeof first published struct */
 141
 142 /*
 143  * Hardware event to monitor via a performance monitoring counter:
 144  */
 145 struct perf_counter_attr {
 146
 147         /*
 148          * Major type: hardware/software/tracepoint/etc.
 149          */
 150         __u32                   type;
 151
 152         /*
 153          * Size of the attr structure, for fwd/bwd compat.
 154          */
 155         __u32                   size;
 156
 157         /*
 158          * Type specific configuration information.
 159          */
 160         __u64                   config;
 161
 162         union {
 163                 __u64           sample_period;
 164                 __u64           sample_freq;
 165         };
 166
 167         __u64                   sample_type;
 168         __u64                   read_format;
 169
 170         __u64                   disabled       :  1, /* off by default        */
 171                                 inherit        :  1, /* children inherit it   */
 172                                 pinned         :  1, /* must always be on PMU */
 173                                 exclusive      :  1, /* only group on PMU     */
 174                                 exclude_user   :  1, /* don't count user      */
 175                                 exclude_kernel :  1, /* ditto kernel          */
 176                                 exclude_hv     :  1, /* ditto hypervisor      */
 177                                 exclude_idle   :  1, /* don't count when idle */
 178                                 mmap           :  1, /* include mmap data     */
 179                                 comm           :  1, /* include comm data     */
 180                                 freq           :  1, /* use freq, not period  */
 181
 182                                 __reserved_1   : 53;
 183
 184         __u32                   wakeup_events;  /* wakeup every n events */
 185         __u32                   __reserved_2;
 186
 187         __u64                   __reserved_3;
 188 };
 189
 190 /*
 191  * Ioctls that can be done on a perf counter fd:
 192  */
 193 #define PERF_COUNTER_IOC_ENABLE         _IO ('$', 0)
 194 #define PERF_COUNTER_IOC_DISABLE        _IO ('$', 1)
 195 #define PERF_COUNTER_IOC_REFRESH        _IO ('$', 2)
 196 #define PERF_COUNTER_IOC_RESET          _IO ('$', 3)
 197 #define PERF_COUNTER_IOC_PERIOD         _IOW('$', 4, u64)
 198
 199 enum perf_counter_ioc_flags {
 200         PERF_IOC_FLAG_GROUP             = 1U << 0,
 201 };
 202
 203 /*
 204  * Structure of the page that can be mapped via mmap
 205  */
 206 struct perf_counter_mmap_page {
 207         __u32   version;                /* version number of this structure */
 208         __u32   compat_version;         /* lowest version this is compat with */
 209
 210         /*
 211          * Bits needed to read the hw counters in user-space.
 212          *
 213          *   u32 seq;
 214          *   s64 count;
 215          *
 216          *   do {
 217          *     seq = pc->lock;
 218          *
 219          *     barrier()
 220          *     if (pc->index) {
 221          *       count = pmc_read(pc->index - 1);
 222          *       count += pc->offset;
 223          *     } else
 224          *       goto regular_read;
 225          *
 226          *     barrier();
 227          *   } while (pc->lock != seq);
 228          *
 229          * NOTE: for obvious reason this only works on self-monitoring
 230          *       processes.
 231          */
 232         __u32   lock;                   /* seqlock for synchronization */
 233         __u32   index;                  /* hardware counter identifier */
 234         __s64   offset;                 /* add to hardware counter value */
 235         __u64   time_enabled;           /* time counter active */
 236         __u64   time_running;           /* time counter on cpu */
 237
 238                 /*
 239                  * Hole for extension of the self monitor capabilities
 240                  */
 241
 242         __u64   __reserved[123];        /* align to 1k */
 243
 244         /*
 245          * Control data for the mmap() data buffer.
 246          *
 247          * User-space reading the @data_head value should issue an rmb(), on
 248          * SMP capable platforms, after reading this value -- see
 249          * perf_counter_wakeup().
 250          *
 251          * When the mapping is PROT_WRITE the @data_tail value should be
 252          * written by userspace to reflect the last read data. In this case
 253          * the kernel will not over-write unread data.
 254          */
 255         __u64   data_head;              /* head in the data section */
 256         __u64   data_tail;              /* user-space written tail */
 257 };
 258
 259 #define PERF_EVENT_MISC_CPUMODE_MASK            (3 << 0)
 260 #define PERF_EVENT_MISC_CPUMODE_UNKNOWN         (0 << 0)
 261 #define PERF_EVENT_MISC_KERNEL                  (1 << 0)
 262 #define PERF_EVENT_MISC_USER                    (2 << 0)
 263 #define PERF_EVENT_MISC_HYPERVISOR              (3 << 0)
 264 #define PERF_EVENT_MISC_OVERFLOW                (1 << 2)
 265
 266 struct perf_event_header {
 267         __u32   type;
 268         __u16   misc;
 269         __u16   size;
 270 };
 271
 272 enum perf_event_type {
 273
 274         /*
 275          * The MMAP events record the PROT_EXEC mappings so that we can
 276          * correlate userspace IPs to code. They have the following structure:
 277          *
 278          * struct {
 279          *      struct perf_event_header        header;
 280          *
 281          *      u32                             pid, tid;
 282          *      u64                             addr;
 283          *      u64                             len;
 284          *      u64                             pgoff;
 285          *      char                            filename[];
 286          * };
 287          */
 288         PERF_EVENT_MMAP                 = 1,
 289
 290         /*
 291          * struct {
 292          *      struct perf_event_header        header;
 293          *      u64                             id;
 294          *      u64                             lost;
 295          * };
 296          */
 297         PERF_EVENT_LOST                 = 2,
 298
 299         /*
 300          * struct {
 301          *      struct perf_event_header        header;
 302          *
 303          *      u32                             pid, tid;
 304          *      char                            comm[];
 305          * };
 306          */
 307         PERF_EVENT_COMM                 = 3,
 308
 309         /*
 310          * struct {
 311          *      struct perf_event_header        header;
 312          *      u64                             time;
 313          *      u64                             id;
 314          *      u64                             sample_period;
 315          * };
 316          */
 317         PERF_EVENT_PERIOD               = 4,
 318
 319         /*
 320          * struct {
 321          *      struct perf_event_header        header;
 322          *      u64                             time;
 323          *      u64                             id;
 324          * };
 325          */
 326         PERF_EVENT_THROTTLE             = 5,
 327         PERF_EVENT_UNTHROTTLE           = 6,
 328
 329         /*
 330          * struct {
 331          *      struct perf_event_header        header;
 332          *      u32                             pid, ppid;
 333          * };
 334          */
 335         PERF_EVENT_FORK                 = 7,
 336
 337         /*
 338          * struct {
 339          *      struct perf_event_header        header;
 340          *      u32                             pid, tid;
 341          *      u64                             value;
 342          *      { u64           time_enabled;   } && PERF_FORMAT_ENABLED
 343          *      { u64           time_running;   } && PERF_FORMAT_RUNNING
 344          *      { u64           parent_id;      } && PERF_FORMAT_ID
 345          * };
 346          */
 347         PERF_EVENT_READ                 = 8,
 348
 349         /*
 350          * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
 351          * will be PERF_SAMPLE_*
 352          *
 353          * struct {
 354          *      struct perf_event_header        header;
 355          *
 356          *      { u64                   ip;       } && PERF_SAMPLE_IP
 357          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
 358          *      { u64                   time;     } && PERF_SAMPLE_TIME
 359          *      { u64                   addr;     } && PERF_SAMPLE_ADDR
 360          *      { u64                   config;   } && PERF_SAMPLE_CONFIG
 361          *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
 362          *
 363          *      { u64                   nr;
 364          *        { u64 id, val; }      cnt[nr];  } && PERF_SAMPLE_GROUP
 365          *
 366          *      { u64                   nr,
 367          *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
 368          * };
 369          */
 370 };
 371
 372 enum perf_callchain_context {
 373         PERF_CONTEXT_HV                 = (__u64)-32,
 374         PERF_CONTEXT_KERNEL             = (__u64)-128,
 375         PERF_CONTEXT_USER               = (__u64)-512,
 376
 377         PERF_CONTEXT_GUEST              = (__u64)-2048,
 378         PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
 379         PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
 380
 381         PERF_CONTEXT_MAX                = (__u64)-4095,
 382 };
 383
 384 #ifdef __KERNEL__
 385 /*
 386  * Kernel-internal data types and definitions:
 387  */
 388
 389 #ifdef CONFIG_PERF_COUNTERS
 390 # include <asm/perf_counter.h>
 391 #endif
 392
 393 #include <linux/list.h>
 394 #include <linux/mutex.h>
 395 #include <linux/rculist.h>
 396 #include <linux/rcupdate.h>
 397 #include <linux/spinlock.h>
 398 #include <linux/hrtimer.h>
 399 #include <linux/fs.h>
 400 #include <linux/pid_namespace.h>
 401 #include <asm/atomic.h>
 402
 403 #define PERF_MAX_STACK_DEPTH            255
 404
 405 struct perf_callchain_entry {
 406         __u64                           nr;
 407         __u64                           ip[PERF_MAX_STACK_DEPTH];
 408 };
 409
 410 struct task_struct;
 411
 412 /**
 413  * struct hw_perf_counter - performance counter hardware details:
 414  */
 415 struct hw_perf_counter {
 416 #ifdef CONFIG_PERF_COUNTERS
 417         union {
 418                 struct { /* hardware */
 419                         u64             config;
 420                         unsigned long   config_base;
 421                         unsigned long   counter_base;
 422                         int             idx;
 423                 };
 424                 union { /* software */
 425                         atomic64_t      count;
 426                         struct hrtimer  hrtimer;
 427                 };
 428         };
 429         atomic64_t                      prev_count;
 430         u64                             sample_period;
 431         u64                             last_period;
 432         atomic64_t                      period_left;
 433         u64                             interrupts;
 434
 435         u64                             freq_count;
 436         u64                             freq_interrupts;
 437         u64                             freq_stamp;
 438 #endif
 439 };
 440
 441 struct perf_counter;
 442
 443 /**
 444  * struct pmu - generic performance monitoring unit
 445  */
 446 struct pmu {
 447         int (*enable)                   (struct perf_counter *counter);
 448         void (*disable)                 (struct perf_counter *counter);
 449         void (*read)                    (struct perf_counter *counter);
 450         void (*unthrottle)              (struct perf_counter *counter);
 451 };
 452
 453 /**
 454  * enum perf_counter_active_state - the states of a counter
 455  */
 456 enum perf_counter_active_state {
 457         PERF_COUNTER_STATE_ERROR        = -2,
 458         PERF_COUNTER_STATE_OFF          = -1,
 459         PERF_COUNTER_STATE_INACTIVE     =  0,
 460         PERF_COUNTER_STATE_ACTIVE       =  1,
 461 };
 462
 463 struct file;
 464
 465 struct perf_mmap_data {
 466         struct rcu_head                 rcu_head;
 467         int                             nr_pages;       /* nr of data pages  */
 468         int                             writable;       /* are we writable   */
 469         int                             nr_locked;      /* nr pages mlocked  */
 470
 471         atomic_t                        poll;           /* POLL_ for wakeups */
 472         atomic_t                        events;         /* event limit       */
 473
 474         atomic_long_t                   head;           /* write position    */
 475         atomic_long_t                   done_head;      /* completed head    */
 476
 477         atomic_t                        lock;           /* concurrent writes */
 478         atomic_t                        wakeup;         /* needs a wakeup    */
 479         atomic_t                        lost;           /* nr records lost   */
 480
 481         struct perf_counter_mmap_page   *user_page;
 482         void                            *data_pages[0];
 483 };
 484
 485 struct perf_pending_entry {
 486         struct perf_pending_entry *next;
 487         void (*func)(struct perf_pending_entry *);
 488 };
 489
 490 /**
 491  * struct perf_counter - performance counter kernel representation:
 492  */
 493 struct perf_counter {
 494 #ifdef CONFIG_PERF_COUNTERS
 495         struct list_head                list_entry;
 496         struct list_head                event_entry;
 497         struct list_head                sibling_list;
 498         int                             nr_siblings;
 499         struct perf_counter             *group_leader;
 500         const struct pmu                *pmu;
 501
 502         enum perf_counter_active_state  state;
 503         atomic64_t                      count;
 504
 505         /*
 506          * These are the total time in nanoseconds that the counter
 507          * has been enabled (i.e. eligible to run, and the task has
 508          * been scheduled in, if this is a per-task counter)
 509          * and running (scheduled onto the CPU), respectively.
 510          *
 511          * They are computed from tstamp_enabled, tstamp_running and
 512          * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
 513          */
 514         u64                             total_time_enabled;
 515         u64                             total_time_running;
 516
 517         /*
 518          * These are timestamps used for computing total_time_enabled
 519          * and total_time_running when the counter is in INACTIVE or
 520          * ACTIVE state, measured in nanoseconds from an arbitrary point
 521          * in time.
 522          * tstamp_enabled: the notional time when the counter was enabled
 523          * tstamp_running: the notional time when the counter was scheduled on
 524          * tstamp_stopped: in INACTIVE state, the notional time when the
 525          *      counter was scheduled off.
 526          */
 527         u64                             tstamp_enabled;
 528         u64                             tstamp_running;
 529         u64                             tstamp_stopped;
 530
 531         struct perf_counter_attr        attr;
 532         struct hw_perf_counter          hw;
 533
 534         struct perf_counter_context     *ctx;
 535         struct file                     *filp;
 536
 537         /*
 538          * These accumulate total time (in nanoseconds) that children
 539          * counters have been enabled and running, respectively.
 540          */
 541         atomic64_t                      child_total_time_enabled;
 542         atomic64_t                      child_total_time_running;
 543
 544         /*
 545          * Protect attach/detach and child_list:
 546          */
 547         struct mutex                    child_mutex;
 548         struct list_head                child_list;
 549         struct perf_counter             *parent;
 550
 551         int                             oncpu;
 552         int                             cpu;
 553
 554         struct list_head                owner_entry;
 555         struct task_struct              *owner;
 556
 557         /* mmap bits */
 558         struct mutex                    mmap_mutex;
 559         atomic_t                        mmap_count;
 560         struct perf_mmap_data           *data;
 561
 562         /* poll related */
 563         wait_queue_head_t               waitq;
 564         struct fasync_struct            *fasync;
 565
 566         /* delayed work for NMIs and such */
 567         int                             pending_wakeup;
 568         int                             pending_kill;
 569         int                             pending_disable;
 570         struct perf_pending_entry       pending;
 571
 572         atomic_t                        event_limit;
 573
 574         void (*destroy)(struct perf_counter *);
 575         struct rcu_head                 rcu_head;
 576
 577         struct pid_namespace            *ns;
 578         u64                             id;
 579 #endif
 580 };
 581
 582 /**
 583  * struct perf_counter_context - counter context structure
 584  *
 585  * Used as a container for task counters and CPU counters as well:
 586  */
 587 struct perf_counter_context {
 588         /*
 589          * Protect the states of the counters in the list,
 590          * nr_active, and the list:
 591          */
 592         spinlock_t                      lock;
 593         /*
 594          * Protect the list of counters.  Locking either mutex or lock
 595          * is sufficient to ensure the list doesn't change; to change
 596          * the list you need to lock both the mutex and the spinlock.
 597          */
 598         struct mutex                    mutex;
 599
 600         struct list_head                counter_list;
 601         struct list_head                event_list;
 602         int                             nr_counters;
 603         int                             nr_active;
 604         int                             is_active;
 605         atomic_t                        refcount;
 606         struct task_struct              *task;
 607
 608         /*
 609          * Context clock, runs when context enabled.
 610          */
 611         u64                             time;
 612         u64                             timestamp;
 613
 614         /*
 615          * These fields let us detect when two contexts have both
 616          * been cloned (inherited) from a common ancestor.
 617          */
 618         struct perf_counter_context     *parent_ctx;
 619         u64                             parent_gen;
 620         u64                             generation;
 621         int                             pin_count;
 622         struct rcu_head                 rcu_head;
 623 };
 624
 625 /**
 626  * struct perf_counter_cpu_context - per cpu counter context structure
 627  */
 628 struct perf_cpu_context {
 629         struct perf_counter_context     ctx;
 630         struct perf_counter_context     *task_ctx;
 631         int                             active_oncpu;
 632         int                             max_pertask;
 633         int                             exclusive;
 634
 635         /*
 636          * Recursion avoidance:
 637          *
 638          * task, softirq, irq, nmi context
 639          */
 640         int                             recursion[4];
 641 };
 642
 643 #ifdef CONFIG_PERF_COUNTERS
 644
 645 /*
 646  * Set by architecture code:
 647  */
 648 extern int perf_max_counters;
 649
 650 extern const struct pmu *hw_perf_counter_init(struct perf_counter *counter);
 651
 652 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
 653 extern void perf_counter_task_sched_out(struct task_struct *task,
 654                                         struct task_struct *next, int cpu);
 655 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
 656 extern int perf_counter_init_task(struct task_struct *child);
 657 extern void perf_counter_exit_task(struct task_struct *child);
 658 extern void perf_counter_free_task(struct task_struct *task);
 659 extern void set_perf_counter_pending(void);
 660 extern void perf_counter_do_pending(void);
 661 extern void perf_counter_print_debug(void);
 662 extern void __perf_disable(void);
 663 extern bool __perf_enable(void);
 664 extern void perf_disable(void);
 665 extern void perf_enable(void);
 666 extern int perf_counter_task_disable(void);
 667 extern int perf_counter_task_enable(void);
 668 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
 669                struct perf_cpu_context *cpuctx,
 670                struct perf_counter_context *ctx, int cpu);
 671 extern void perf_counter_update_userpage(struct perf_counter *counter);
 672
 673 struct perf_sample_data {
 674         struct pt_regs                  *regs;
 675         u64                             addr;
 676         u64                             period;
 677 };
 678
 679 extern int perf_counter_overflow(struct perf_counter *counter, int nmi,
 680                                  struct perf_sample_data *data);
 681
 682 /*
 683  * Return 1 for a software counter, 0 for a hardware counter
 684  */
 685 static inline int is_software_counter(struct perf_counter *counter)
 686 {
 687         return (counter->attr.type != PERF_TYPE_RAW) &&
 688                 (counter->attr.type != PERF_TYPE_HARDWARE) &&
 689                 (counter->attr.type != PERF_TYPE_HW_CACHE);
 690 }
 691
 692 extern atomic_t perf_swcounter_enabled[PERF_COUNT_SW_MAX];
 693
 694 extern void __perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
 695
 696 static inline void
 697 perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
 698 {
 699         if (atomic_read(&perf_swcounter_enabled[event]))
 700                 __perf_swcounter_event(event, nr, nmi, regs, addr);
 701 }
 702
 703 extern void __perf_counter_mmap(struct vm_area_struct *vma);
 704
 705 static inline void perf_counter_mmap(struct vm_area_struct *vma)
 706 {
 707         if (vma->vm_flags & VM_EXEC)
 708                 __perf_counter_mmap(vma);
 709 }
 710
 711 extern void perf_counter_comm(struct task_struct *tsk);
 712 extern void perf_counter_fork(struct task_struct *tsk);
 713
 714 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 715
 716 extern int sysctl_perf_counter_paranoid;
 717 extern int sysctl_perf_counter_mlock;
 718 extern int sysctl_perf_counter_sample_rate;
 719
 720 extern void perf_counter_init(void);
 721
 722 #ifndef perf_misc_flags
 723 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_EVENT_MISC_USER : \
 724                                  PERF_EVENT_MISC_KERNEL)
 725 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
 726 #endif
 727
 728 #else
 729 static inline void
 730 perf_counter_task_sched_in(struct task_struct *task, int cpu)           { }
 731 static inline void
 732 perf_counter_task_sched_out(struct task_struct *task,
 733                             struct task_struct *next, int cpu)          { }
 734 static inline void
 735 perf_counter_task_tick(struct task_struct *task, int cpu)               { }
 736 static inline int perf_counter_init_task(struct task_struct *child)     { return 0; }
 737 static inline void perf_counter_exit_task(struct task_struct *child)    { }
 738 static inline void perf_counter_free_task(struct task_struct *task)     { }
 739 static inline void perf_counter_do_pending(void)                        { }
 740 static inline void perf_counter_print_debug(void)                       { }
 741 static inline void perf_disable(void)                                   { }
 742 static inline void perf_enable(void)                                    { }
 743 static inline int perf_counter_task_disable(void)       { return -EINVAL; }
 744 static inline int perf_counter_task_enable(void)        { return -EINVAL; }
 745
 746 static inline void
 747 perf_swcounter_event(u32 event, u64 nr, int nmi,
 748                      struct pt_regs *regs, u64 addr)                    { }
 749
 750 static inline void perf_counter_mmap(struct vm_area_struct *vma)        { }
 751 static inline void perf_counter_comm(struct task_struct *tsk)           { }
 752 static inline void perf_counter_fork(struct task_struct *tsk)           { }
 753 static inline void perf_counter_init(void)                              { }
 754 #endif
 755
 756 #endif /* __KERNEL__ */
 757 #endif /* _LINUX_PERF_COUNTER_H */