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   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                                 inherit_stat   :  1, /* per task counts       */
 182                                 enable_on_exec :  1, /* next exec enables     */
 183
 184                                 __reserved_1   : 51;
 185
 186         __u32                   wakeup_events;  /* wakeup every n events */
 187         __u32                   __reserved_2;
 188
 189         __u64                   __reserved_3;
 190 };
 191
 192 /*
 193  * Ioctls that can be done on a perf counter fd:
 194  */
 195 #define PERF_COUNTER_IOC_ENABLE         _IO ('$', 0)
 196 #define PERF_COUNTER_IOC_DISABLE        _IO ('$', 1)
 197 #define PERF_COUNTER_IOC_REFRESH        _IO ('$', 2)
 198 #define PERF_COUNTER_IOC_RESET          _IO ('$', 3)
 199 #define PERF_COUNTER_IOC_PERIOD         _IOW('$', 4, u64)
 200
 201 enum perf_counter_ioc_flags {
 202         PERF_IOC_FLAG_GROUP             = 1U << 0,
 203 };
 204
 205 /*
 206  * Structure of the page that can be mapped via mmap
 207  */
 208 struct perf_counter_mmap_page {
 209         __u32   version;                /* version number of this structure */
 210         __u32   compat_version;         /* lowest version this is compat with */
 211
 212         /*
 213          * Bits needed to read the hw counters in user-space.
 214          *
 215          *   u32 seq;
 216          *   s64 count;
 217          *
 218          *   do {
 219          *     seq = pc->lock;
 220          *
 221          *     barrier()
 222          *     if (pc->index) {
 223          *       count = pmc_read(pc->index - 1);
 224          *       count += pc->offset;
 225          *     } else
 226          *       goto regular_read;
 227          *
 228          *     barrier();
 229          *   } while (pc->lock != seq);
 230          *
 231          * NOTE: for obvious reason this only works on self-monitoring
 232          *       processes.
 233          */
 234         __u32   lock;                   /* seqlock for synchronization */
 235         __u32   index;                  /* hardware counter identifier */
 236         __s64   offset;                 /* add to hardware counter value */
 237         __u64   time_enabled;           /* time counter active */
 238         __u64   time_running;           /* time counter on cpu */
 239
 240                 /*
 241                  * Hole for extension of the self monitor capabilities
 242                  */
 243
 244         __u64   __reserved[123];        /* align to 1k */
 245
 246         /*
 247          * Control data for the mmap() data buffer.
 248          *
 249          * User-space reading the @data_head value should issue an rmb(), on
 250          * SMP capable platforms, after reading this value -- see
 251          * perf_counter_wakeup().
 252          *
 253          * When the mapping is PROT_WRITE the @data_tail value should be
 254          * written by userspace to reflect the last read data. In this case
 255          * the kernel will not over-write unread data.
 256          */
 257         __u64   data_head;              /* head in the data section */
 258         __u64   data_tail;              /* user-space written tail */
 259 };
 260
 261 #define PERF_EVENT_MISC_CPUMODE_MASK            (3 << 0)
 262 #define PERF_EVENT_MISC_CPUMODE_UNKNOWN         (0 << 0)
 263 #define PERF_EVENT_MISC_KERNEL                  (1 << 0)
 264 #define PERF_EVENT_MISC_USER                    (2 << 0)
 265 #define PERF_EVENT_MISC_HYPERVISOR              (3 << 0)
 266
 267 struct perf_event_header {
 268         __u32   type;
 269         __u16   misc;
 270         __u16   size;
 271 };
 272
 273 enum perf_event_type {
 274
 275         /*
 276          * The MMAP events record the PROT_EXEC mappings so that we can
 277          * correlate userspace IPs to code. They have the following structure:
 278          *
 279          * struct {
 280          *      struct perf_event_header        header;
 281          *
 282          *      u32                             pid, tid;
 283          *      u64                             addr;
 284          *      u64                             len;
 285          *      u64                             pgoff;
 286          *      char                            filename[];
 287          * };
 288          */
 289         PERF_EVENT_MMAP                 = 1,
 290
 291         /*
 292          * struct {
 293          *      struct perf_event_header        header;
 294          *      u64                             id;
 295          *      u64                             lost;
 296          * };
 297          */
 298         PERF_EVENT_LOST                 = 2,
 299
 300         /*
 301          * struct {
 302          *      struct perf_event_header        header;
 303          *
 304          *      u32                             pid, tid;
 305          *      char                            comm[];
 306          * };
 307          */
 308         PERF_EVENT_COMM                 = 3,
 309
 310         /*
 311          * struct {
 312          *      struct perf_event_header        header;
 313          *      u64                             time;
 314          *      u64                             id;
 315          *      u64                             sample_period;
 316          * };
 317          */
 318         PERF_EVENT_PERIOD               = 4,
 319
 320         /*
 321          * struct {
 322          *      struct perf_event_header        header;
 323          *      u64                             time;
 324          *      u64                             id;
 325          * };
 326          */
 327         PERF_EVENT_THROTTLE             = 5,
 328         PERF_EVENT_UNTHROTTLE           = 6,
 329
 330         /*
 331          * struct {
 332          *      struct perf_event_header        header;
 333          *      u32                             pid, ppid;
 334          * };
 335          */
 336         PERF_EVENT_FORK                 = 7,
 337
 338         /*
 339          * struct {
 340          *      struct perf_event_header        header;
 341          *      u32                             pid, tid;
 342          *      u64                             value;
 343          *      { u64           time_enabled;   } && PERF_FORMAT_ENABLED
 344          *      { u64           time_running;   } && PERF_FORMAT_RUNNING
 345          *      { u64           parent_id;      } && PERF_FORMAT_ID
 346          * };
 347          */
 348         PERF_EVENT_READ                 = 8,
 349
 350         /*
 351          * struct {
 352          *      struct perf_event_header        header;
 353          *
 354          *      { u64                   ip;       } && PERF_SAMPLE_IP
 355          *      { u32                   pid, tid; } && PERF_SAMPLE_TID
 356          *      { u64                   time;     } && PERF_SAMPLE_TIME
 357          *      { u64                   addr;     } && PERF_SAMPLE_ADDR
 358          *      { u64                   id;       } && PERF_SAMPLE_ID
 359          *      { u32                   cpu, res; } && PERF_SAMPLE_CPU
 360          *      { u64                   period;   } && PERF_SAMPLE_PERIOD
 361          *
 362          *      { u64                   nr;
 363          *        { u64 id, val; }      cnt[nr];  } && PERF_SAMPLE_GROUP
 364          *
 365          *      { u64                   nr,
 366          *        u64                   ips[nr];  } && PERF_SAMPLE_CALLCHAIN
 367          * };
 368          */
 369         PERF_EVENT_SAMPLE               = 9,
 370
 371         PERF_EVENT_MAX,                 /* non-ABI */
 372 };
 373
 374 enum perf_callchain_context {
 375         PERF_CONTEXT_HV                 = (__u64)-32,
 376         PERF_CONTEXT_KERNEL             = (__u64)-128,
 377         PERF_CONTEXT_USER               = (__u64)-512,
 378
 379         PERF_CONTEXT_GUEST              = (__u64)-2048,
 380         PERF_CONTEXT_GUEST_KERNEL       = (__u64)-2176,
 381         PERF_CONTEXT_GUEST_USER         = (__u64)-2560,
 382
 383         PERF_CONTEXT_MAX                = (__u64)-4095,
 384 };
 385
 386 #ifdef __KERNEL__
 387 /*
 388  * Kernel-internal data types and definitions:
 389  */
 390
 391 #ifdef CONFIG_PERF_COUNTERS
 392 # include <asm/perf_counter.h>
 393 #endif
 394
 395 #include <linux/list.h>
 396 #include <linux/mutex.h>
 397 #include <linux/rculist.h>
 398 #include <linux/rcupdate.h>
 399 #include <linux/spinlock.h>
 400 #include <linux/hrtimer.h>
 401 #include <linux/fs.h>
 402 #include <linux/pid_namespace.h>
 403 #include <asm/atomic.h>
 404
 405 #define PERF_MAX_STACK_DEPTH            255
 406
 407 struct perf_callchain_entry {
 408         __u64                           nr;
 409         __u64                           ip[PERF_MAX_STACK_DEPTH];
 410 };
 411
 412 struct task_struct;
 413
 414 /**
 415  * struct hw_perf_counter - performance counter hardware details:
 416  */
 417 struct hw_perf_counter {
 418 #ifdef CONFIG_PERF_COUNTERS
 419         union {
 420                 struct { /* hardware */
 421                         u64             config;
 422                         unsigned long   config_base;
 423                         unsigned long   counter_base;
 424                         int             idx;
 425                 };
 426                 union { /* software */
 427                         atomic64_t      count;
 428                         struct hrtimer  hrtimer;
 429                 };
 430         };
 431         atomic64_t                      prev_count;
 432         u64                             sample_period;
 433         u64                             last_period;
 434         atomic64_t                      period_left;
 435         u64                             interrupts;
 436
 437         u64                             freq_count;
 438         u64                             freq_interrupts;
 439         u64                             freq_stamp;
 440 #endif
 441 };
 442
 443 struct perf_counter;
 444
 445 /**
 446  * struct pmu - generic performance monitoring unit
 447  */
 448 struct pmu {
 449         int (*enable)                   (struct perf_counter *counter);
 450         void (*disable)                 (struct perf_counter *counter);
 451         void (*read)                    (struct perf_counter *counter);
 452         void (*unthrottle)              (struct perf_counter *counter);
 453 };
 454
 455 /**
 456  * enum perf_counter_active_state - the states of a counter
 457  */
 458 enum perf_counter_active_state {
 459         PERF_COUNTER_STATE_ERROR        = -2,
 460         PERF_COUNTER_STATE_OFF          = -1,
 461         PERF_COUNTER_STATE_INACTIVE     =  0,
 462         PERF_COUNTER_STATE_ACTIVE       =  1,
 463 };
 464
 465 struct file;
 466
 467 struct perf_mmap_data {
 468         struct rcu_head                 rcu_head;
 469         int                             nr_pages;       /* nr of data pages  */
 470         int                             writable;       /* are we writable   */
 471         int                             nr_locked;      /* nr pages mlocked  */
 472
 473         atomic_t                        poll;           /* POLL_ for wakeups */
 474         atomic_t                        events;         /* event limit       */
 475
 476         atomic_long_t                   head;           /* write position    */
 477         atomic_long_t                   done_head;      /* completed head    */
 478
 479         atomic_t                        lock;           /* concurrent writes */
 480         atomic_t                        wakeup;         /* needs a wakeup    */
 481         atomic_t                        lost;           /* nr records lost   */
 482
 483         struct perf_counter_mmap_page   *user_page;
 484         void                            *data_pages[0];
 485 };
 486
 487 struct perf_pending_entry {
 488         struct perf_pending_entry *next;
 489         void (*func)(struct perf_pending_entry *);
 490 };
 491
 492 /**
 493  * struct perf_counter - performance counter kernel representation:
 494  */
 495 struct perf_counter {
 496 #ifdef CONFIG_PERF_COUNTERS
 497         struct list_head                list_entry;
 498         struct list_head                event_entry;
 499         struct list_head                sibling_list;
 500         int                             nr_siblings;
 501         struct perf_counter             *group_leader;
 502         const struct pmu                *pmu;
 503
 504         enum perf_counter_active_state  state;
 505         atomic64_t                      count;
 506
 507         /*
 508          * These are the total time in nanoseconds that the counter
 509          * has been enabled (i.e. eligible to run, and the task has
 510          * been scheduled in, if this is a per-task counter)
 511          * and running (scheduled onto the CPU), respectively.
 512          *
 513          * They are computed from tstamp_enabled, tstamp_running and
 514          * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
 515          */
 516         u64                             total_time_enabled;
 517         u64                             total_time_running;
 518
 519         /*
 520          * These are timestamps used for computing total_time_enabled
 521          * and total_time_running when the counter is in INACTIVE or
 522          * ACTIVE state, measured in nanoseconds from an arbitrary point
 523          * in time.
 524          * tstamp_enabled: the notional time when the counter was enabled
 525          * tstamp_running: the notional time when the counter was scheduled on
 526          * tstamp_stopped: in INACTIVE state, the notional time when the
 527          *      counter was scheduled off.
 528          */
 529         u64                             tstamp_enabled;
 530         u64                             tstamp_running;
 531         u64                             tstamp_stopped;
 532
 533         struct perf_counter_attr        attr;
 534         struct hw_perf_counter          hw;
 535
 536         struct perf_counter_context     *ctx;
 537         struct file                     *filp;
 538
 539         /*
 540          * These accumulate total time (in nanoseconds) that children
 541          * counters have been enabled and running, respectively.
 542          */
 543         atomic64_t                      child_total_time_enabled;
 544         atomic64_t                      child_total_time_running;
 545
 546         /*
 547          * Protect attach/detach and child_list:
 548          */
 549         struct mutex                    child_mutex;
 550         struct list_head                child_list;
 551         struct perf_counter             *parent;
 552
 553         int                             oncpu;
 554         int                             cpu;
 555
 556         struct list_head                owner_entry;
 557         struct task_struct              *owner;
 558
 559         /* mmap bits */
 560         struct mutex                    mmap_mutex;
 561         atomic_t                        mmap_count;
 562         struct perf_mmap_data           *data;
 563
 564         /* poll related */
 565         wait_queue_head_t               waitq;
 566         struct fasync_struct            *fasync;
 567
 568         /* delayed work for NMIs and such */
 569         int                             pending_wakeup;
 570         int                             pending_kill;
 571         int                             pending_disable;
 572         struct perf_pending_entry       pending;
 573
 574         atomic_t                        event_limit;
 575
 576         void (*destroy)(struct perf_counter *);
 577         struct rcu_head                 rcu_head;
 578
 579         struct pid_namespace            *ns;
 580         u64                             id;
 581 #endif
 582 };
 583
 584 /**
 585  * struct perf_counter_context - counter context structure
 586  *
 587  * Used as a container for task counters and CPU counters as well:
 588  */
 589 struct perf_counter_context {
 590         /*
 591          * Protect the states of the counters in the list,
 592          * nr_active, and the list:
 593          */
 594         spinlock_t                      lock;
 595         /*
 596          * Protect the list of counters.  Locking either mutex or lock
 597          * is sufficient to ensure the list doesn't change; to change
 598          * the list you need to lock both the mutex and the spinlock.
 599          */
 600         struct mutex                    mutex;
 601
 602         struct list_head                counter_list;
 603         struct list_head                event_list;
 604         int                             nr_counters;
 605         int                             nr_active;
 606         int                             is_active;
 607         int                             nr_stat;
 608         atomic_t                        refcount;
 609         struct task_struct              *task;
 610
 611         /*
 612          * Context clock, runs when context enabled.
 613          */
 614         u64                             time;
 615         u64                             timestamp;
 616
 617         /*
 618          * These fields let us detect when two contexts have both
 619          * been cloned (inherited) from a common ancestor.
 620          */
 621         struct perf_counter_context     *parent_ctx;
 622         u64                             parent_gen;
 623         u64                             generation;
 624         int                             pin_count;
 625         struct rcu_head                 rcu_head;
 626 };
 627
 628 /**
 629  * struct perf_counter_cpu_context - per cpu counter context structure
 630  */
 631 struct perf_cpu_context {
 632         struct perf_counter_context     ctx;
 633         struct perf_counter_context     *task_ctx;
 634         int                             active_oncpu;
 635         int                             max_pertask;
 636         int                             exclusive;
 637
 638         /*
 639          * Recursion avoidance:
 640          *
 641          * task, softirq, irq, nmi context
 642          */
 643         int                             recursion[4];
 644 };
 645
 646 #ifdef CONFIG_PERF_COUNTERS
 647
 648 /*
 649  * Set by architecture code:
 650  */
 651 extern int perf_max_counters;
 652
 653 extern const struct pmu *hw_perf_counter_init(struct perf_counter *counter);
 654
 655 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
 656 extern void perf_counter_task_sched_out(struct task_struct *task,
 657                                         struct task_struct *next, int cpu);
 658 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
 659 extern int perf_counter_init_task(struct task_struct *child);
 660 extern void perf_counter_exit_task(struct task_struct *child);
 661 extern void perf_counter_free_task(struct task_struct *task);
 662 extern void set_perf_counter_pending(void);
 663 extern void perf_counter_do_pending(void);
 664 extern void perf_counter_print_debug(void);
 665 extern void __perf_disable(void);
 666 extern bool __perf_enable(void);
 667 extern void perf_disable(void);
 668 extern void perf_enable(void);
 669 extern int perf_counter_task_disable(void);
 670 extern int perf_counter_task_enable(void);
 671 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
 672                struct perf_cpu_context *cpuctx,
 673                struct perf_counter_context *ctx, int cpu);
 674 extern void perf_counter_update_userpage(struct perf_counter *counter);
 675
 676 struct perf_sample_data {
 677         struct pt_regs                  *regs;
 678         u64                             addr;
 679         u64                             period;
 680 };
 681
 682 extern int perf_counter_overflow(struct perf_counter *counter, int nmi,
 683                                  struct perf_sample_data *data);
 684
 685 /*
 686  * Return 1 for a software counter, 0 for a hardware counter
 687  */
 688 static inline int is_software_counter(struct perf_counter *counter)
 689 {
 690         return (counter->attr.type != PERF_TYPE_RAW) &&
 691                 (counter->attr.type != PERF_TYPE_HARDWARE) &&
 692                 (counter->attr.type != PERF_TYPE_HW_CACHE);
 693 }
 694
 695 extern atomic_t perf_swcounter_enabled[PERF_COUNT_SW_MAX];
 696
 697 extern void __perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
 698
 699 static inline void
 700 perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
 701 {
 702         if (atomic_read(&perf_swcounter_enabled[event]))
 703                 __perf_swcounter_event(event, nr, nmi, regs, addr);
 704 }
 705
 706 extern void __perf_counter_mmap(struct vm_area_struct *vma);
 707
 708 static inline void perf_counter_mmap(struct vm_area_struct *vma)
 709 {
 710         if (vma->vm_flags & VM_EXEC)
 711                 __perf_counter_mmap(vma);
 712 }
 713
 714 extern void perf_counter_comm(struct task_struct *tsk);
 715 extern void perf_counter_fork(struct task_struct *tsk);
 716
 717 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 718
 719 extern int sysctl_perf_counter_paranoid;
 720 extern int sysctl_perf_counter_mlock;
 721 extern int sysctl_perf_counter_sample_rate;
 722
 723 extern void perf_counter_init(void);
 724
 725 #ifndef perf_misc_flags
 726 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_EVENT_MISC_USER : \
 727                                  PERF_EVENT_MISC_KERNEL)
 728 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
 729 #endif
 730
 731 #else
 732 static inline void
 733 perf_counter_task_sched_in(struct task_struct *task, int cpu)           { }
 734 static inline void
 735 perf_counter_task_sched_out(struct task_struct *task,
 736                             struct task_struct *next, int cpu)          { }
 737 static inline void
 738 perf_counter_task_tick(struct task_struct *task, int cpu)               { }
 739 static inline int perf_counter_init_task(struct task_struct *child)     { return 0; }
 740 static inline void perf_counter_exit_task(struct task_struct *child)    { }
 741 static inline void perf_counter_free_task(struct task_struct *task)     { }
 742 static inline void perf_counter_do_pending(void)                        { }
 743 static inline void perf_counter_print_debug(void)                       { }
 744 static inline void perf_disable(void)                                   { }
 745 static inline void perf_enable(void)                                    { }
 746 static inline int perf_counter_task_disable(void)       { return -EINVAL; }
 747 static inline int perf_counter_task_enable(void)        { return -EINVAL; }
 748
 749 static inline void
 750 perf_swcounter_event(u32 event, u64 nr, int nmi,
 751                      struct pt_regs *regs, u64 addr)                    { }
 752
 753 static inline void perf_counter_mmap(struct vm_area_struct *vma)        { }
 754 static inline void perf_counter_comm(struct task_struct *tsk)           { }
 755 static inline void perf_counter_fork(struct task_struct *tsk)           { }
 756 static inline void perf_counter_init(void)                              { }
 757 #endif
 758
 759 #endif /* __KERNEL__ */
 760 #endif /* _LINUX_PERF_COUNTER_H */