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