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