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   1 /*
   2  *  Performance counters:
   3  *
   4  *   Copyright(C) 2008, Thomas Gleixner <tglx@linutronix.de>
   5  *   Copyright(C) 2008, Red Hat, Inc., Ingo Molnar
   6  *
   7  *  Data type definitions, declarations, prototypes.
   8  *
   9  *  Started by: Thomas Gleixner and Ingo Molnar
  10  *
  11  *  For licencing details see kernel-base/COPYING
  12  */
  13 #ifndef _LINUX_PERF_COUNTER_H
  14 #define _LINUX_PERF_COUNTER_H
  15
  16 #include <linux/types.h>
  17 #include <linux/ioctl.h>
  18 #include <asm/byteorder.h>
  19
  20 /*
  21  * User-space ABI bits:
  22  */
  23
  24 /*
  25  * hw_event.type
  26  */
  27 enum perf_event_types {
  28         PERF_TYPE_HARDWARE              = 0,
  29         PERF_TYPE_SOFTWARE              = 1,
  30         PERF_TYPE_TRACEPOINT            = 2,
  31
  32         /*
  33          * available TYPE space, raw is the max value.
  34          */
  35
  36         PERF_TYPE_RAW                   = 128,
  37 };
  38
  39 /*
  40  * Generalized performance counter event types, used by the hw_event.event_id
  41  * parameter of the sys_perf_counter_open() syscall:
  42  */
  43 enum hw_event_ids {
  44         /*
  45          * Common hardware events, generalized by the kernel:
  46          */
  47         PERF_COUNT_CPU_CYCLES           = 0,
  48         PERF_COUNT_INSTRUCTIONS         = 1,
  49         PERF_COUNT_CACHE_REFERENCES     = 2,
  50         PERF_COUNT_CACHE_MISSES         = 3,
  51         PERF_COUNT_BRANCH_INSTRUCTIONS  = 4,
  52         PERF_COUNT_BRANCH_MISSES        = 5,
  53         PERF_COUNT_BUS_CYCLES           = 6,
  54
  55         PERF_HW_EVENTS_MAX              = 7,
  56 };
  57
  58 /*
  59  * Special "software" counters provided by the kernel, even if the hardware
  60  * does not support performance counters. These counters measure various
  61  * physical and sw events of the kernel (and allow the profiling of them as
  62  * well):
  63  */
  64 enum sw_event_ids {
  65         PERF_COUNT_CPU_CLOCK            = 0,
  66         PERF_COUNT_TASK_CLOCK           = 1,
  67         PERF_COUNT_PAGE_FAULTS          = 2,
  68         PERF_COUNT_CONTEXT_SWITCHES     = 3,
  69         PERF_COUNT_CPU_MIGRATIONS       = 4,
  70         PERF_COUNT_PAGE_FAULTS_MIN      = 5,
  71         PERF_COUNT_PAGE_FAULTS_MAJ      = 6,
  72
  73         PERF_SW_EVENTS_MAX              = 7,
  74 };
  75
  76 #define __PERF_COUNTER_MASK(name)                       \
  77         (((1ULL << PERF_COUNTER_##name##_BITS) - 1) <<  \
  78          PERF_COUNTER_##name##_SHIFT)
  79
  80 #define PERF_COUNTER_RAW_BITS           1
  81 #define PERF_COUNTER_RAW_SHIFT          63
  82 #define PERF_COUNTER_RAW_MASK           __PERF_COUNTER_MASK(RAW)
  83
  84 #define PERF_COUNTER_CONFIG_BITS        63
  85 #define PERF_COUNTER_CONFIG_SHIFT       0
  86 #define PERF_COUNTER_CONFIG_MASK        __PERF_COUNTER_MASK(CONFIG)
  87
  88 #define PERF_COUNTER_TYPE_BITS          7
  89 #define PERF_COUNTER_TYPE_SHIFT         56
  90 #define PERF_COUNTER_TYPE_MASK          __PERF_COUNTER_MASK(TYPE)
  91
  92 #define PERF_COUNTER_EVENT_BITS         56
  93 #define PERF_COUNTER_EVENT_SHIFT        0
  94 #define PERF_COUNTER_EVENT_MASK         __PERF_COUNTER_MASK(EVENT)
  95
  96 /*
  97  * Bits that can be set in hw_event.record_type to request information
  98  * in the overflow packets.
  99  */
 100 enum perf_counter_record_format {
 101         PERF_RECORD_IP          = 1U << 0,
 102         PERF_RECORD_TID         = 1U << 1,
 103         PERF_RECORD_TIME        = 1U << 2,
 104         PERF_RECORD_ADDR        = 1U << 3,
 105         PERF_RECORD_GROUP       = 1U << 4,
 106         PERF_RECORD_CALLCHAIN   = 1U << 5,
 107 };
 108
 109 /*
 110  * Bits that can be set in hw_event.read_format to request that
 111  * reads on the counter should return the indicated quantities,
 112  * in increasing order of bit value, after the counter value.
 113  */
 114 enum perf_counter_read_format {
 115         PERF_FORMAT_TOTAL_TIME_ENABLED  =  1,
 116         PERF_FORMAT_TOTAL_TIME_RUNNING  =  2,
 117 };
 118
 119 /*
 120  * Hardware event to monitor via a performance monitoring counter:
 121  */
 122 struct perf_counter_hw_event {
 123         /*
 124          * The MSB of the config word signifies if the rest contains cpu
 125          * specific (raw) counter configuration data, if unset, the next
 126          * 7 bits are an event type and the rest of the bits are the event
 127          * identifier.
 128          */
 129         __u64                   config;
 130
 131         __u64                   irq_period;
 132         __u32                   record_type;
 133         __u32                   read_format;
 134
 135         __u64                   disabled       :  1, /* off by default        */
 136                                 nmi            :  1, /* NMI sampling          */
 137                                 inherit        :  1, /* children inherit it   */
 138                                 pinned         :  1, /* must always be on PMU */
 139                                 exclusive      :  1, /* only group on PMU     */
 140                                 exclude_user   :  1, /* don't count user      */
 141                                 exclude_kernel :  1, /* ditto kernel          */
 142                                 exclude_hv     :  1, /* ditto hypervisor      */
 143                                 exclude_idle   :  1, /* don't count when idle */
 144                                 mmap           :  1, /* include mmap data     */
 145                                 munmap         :  1, /* include munmap data   */
 146                                 comm           :  1, /* include comm data     */
 147
 148                                 __reserved_1   : 52;
 149
 150         __u32                   extra_config_len;
 151         __u32                   wakeup_events;  /* wakeup every n events */
 152
 153         __u64                   __reserved_2;
 154         __u64                   __reserved_3;
 155 };
 156
 157 /*
 158  * Ioctls that can be done on a perf counter fd:
 159  */
 160 #define PERF_COUNTER_IOC_ENABLE         _IOW('$', 0, u32)
 161 #define PERF_COUNTER_IOC_DISABLE        _IOW('$', 1, u32)
 162 #define PERF_COUNTER_IOC_REFRESH        _IOW('$', 2, u32)
 163 #define PERF_COUNTER_IOC_RESET          _IOW('$', 3, u32)
 164
 165 enum perf_counter_ioc_flags {
 166         PERF_IOC_FLAG_GROUP             = 1U << 0,
 167 };
 168
 169 /*
 170  * Structure of the page that can be mapped via mmap
 171  */
 172 struct perf_counter_mmap_page {
 173         __u32   version;                /* version number of this structure */
 174         __u32   compat_version;         /* lowest version this is compat with */
 175
 176         /*
 177          * Bits needed to read the hw counters in user-space.
 178          *
 179          *   u32 seq;
 180          *   s64 count;
 181          *
 182          *   do {
 183          *     seq = pc->lock;
 184          *
 185          *     barrier()
 186          *     if (pc->index) {
 187          *       count = pmc_read(pc->index - 1);
 188          *       count += pc->offset;
 189          *     } else
 190          *       goto regular_read;
 191          *
 192          *     barrier();
 193          *   } while (pc->lock != seq);
 194          *
 195          * NOTE: for obvious reason this only works on self-monitoring
 196          *       processes.
 197          */
 198         __u32   lock;                   /* seqlock for synchronization */
 199         __u32   index;                  /* hardware counter identifier */
 200         __s64   offset;                 /* add to hardware counter value */
 201
 202         /*
 203          * Control data for the mmap() data buffer.
 204          *
 205          * User-space reading this value should issue an rmb(), on SMP capable
 206          * platforms, after reading this value -- see perf_counter_wakeup().
 207          */
 208         __u32   data_head;              /* head in the data section */
 209 };
 210
 211 #define PERF_EVENT_MISC_KERNEL          (1 << 0)
 212 #define PERF_EVENT_MISC_USER            (1 << 1)
 213 #define PERF_EVENT_MISC_OVERFLOW        (1 << 2)
 214
 215 struct perf_event_header {
 216         __u32   type;
 217         __u16   misc;
 218         __u16   size;
 219 };
 220
 221 enum perf_event_type {
 222
 223         /*
 224          * The MMAP events record the PROT_EXEC mappings so that we can
 225          * correlate userspace IPs to code. They have the following structure:
 226          *
 227          * struct {
 228          *      struct perf_event_header        header;
 229          *
 230          *      u32                             pid, tid;
 231          *      u64                             addr;
 232          *      u64                             len;
 233          *      u64                             pgoff;
 234          *      char                            filename[];
 235          * };
 236          */
 237         PERF_EVENT_MMAP                 = 1,
 238         PERF_EVENT_MUNMAP               = 2,
 239
 240         /*
 241          * struct {
 242          *      struct perf_event_header        header;
 243          *
 244          *      u32                             pid, tid;
 245          *      char                            comm[];
 246          * };
 247          */
 248         PERF_EVENT_COMM                 = 3,
 249
 250         /*
 251          * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
 252          * will be PERF_RECORD_*
 253          *
 254          * struct {
 255          *      struct perf_event_header        header;
 256          *
 257          *      { u64                   ip;       } && PERF_RECORD_IP
 258          *      { u32                   pid, tid; } && PERF_RECORD_TID
 259          *      { u64                   time;     } && PERF_RECORD_TIME
 260          *      { u64                   addr;     } && PERF_RECORD_ADDR
 261          *
 262          *      { u64                   nr;
 263          *        { u64 event, val; }   cnt[nr];  } && PERF_RECORD_GROUP
 264          *
 265          *      { u16                   nr,
 266          *                              hv,
 267          *                              kernel,
 268          *                              user;
 269          *        u64                   ips[nr];  } && PERF_RECORD_CALLCHAIN
 270          * };
 271          */
 272 };
 273
 274 #ifdef __KERNEL__
 275 /*
 276  * Kernel-internal data types and definitions:
 277  */
 278
 279 #ifdef CONFIG_PERF_COUNTERS
 280 # include <asm/perf_counter.h>
 281 #endif
 282
 283 #include <linux/list.h>
 284 #include <linux/mutex.h>
 285 #include <linux/rculist.h>
 286 #include <linux/rcupdate.h>
 287 #include <linux/spinlock.h>
 288 #include <linux/hrtimer.h>
 289 #include <linux/fs.h>
 290 #include <asm/atomic.h>
 291
 292 struct task_struct;
 293
 294 static inline u64 perf_event_raw(struct perf_counter_hw_event *hw_event)
 295 {
 296         return hw_event->config & PERF_COUNTER_RAW_MASK;
 297 }
 298
 299 static inline u64 perf_event_config(struct perf_counter_hw_event *hw_event)
 300 {
 301         return hw_event->config & PERF_COUNTER_CONFIG_MASK;
 302 }
 303
 304 static inline u64 perf_event_type(struct perf_counter_hw_event *hw_event)
 305 {
 306         return (hw_event->config & PERF_COUNTER_TYPE_MASK) >>
 307                 PERF_COUNTER_TYPE_SHIFT;
 308 }
 309
 310 static inline u64 perf_event_id(struct perf_counter_hw_event *hw_event)
 311 {
 312         return hw_event->config & PERF_COUNTER_EVENT_MASK;
 313 }
 314
 315 /**
 316  * struct hw_perf_counter - performance counter hardware details:
 317  */
 318 struct hw_perf_counter {
 319 #ifdef CONFIG_PERF_COUNTERS
 320         union {
 321                 struct { /* hardware */
 322                         u64                             config;
 323                         unsigned long                   config_base;
 324                         unsigned long                   counter_base;
 325                         int                             nmi;
 326                         int                             idx;
 327                 };
 328                 union { /* software */
 329                         atomic64_t                      count;
 330                         struct hrtimer                  hrtimer;
 331                 };
 332         };
 333         atomic64_t                      prev_count;
 334         u64                             irq_period;
 335         atomic64_t                      period_left;
 336 #endif
 337 };
 338
 339 struct perf_counter;
 340
 341 /**
 342  * struct pmu - generic performance monitoring unit
 343  */
 344 struct pmu {
 345         int (*enable)                   (struct perf_counter *counter);
 346         void (*disable)                 (struct perf_counter *counter);
 347         void (*read)                    (struct perf_counter *counter);
 348 };
 349
 350 /**
 351  * enum perf_counter_active_state - the states of a counter
 352  */
 353 enum perf_counter_active_state {
 354         PERF_COUNTER_STATE_ERROR        = -2,
 355         PERF_COUNTER_STATE_OFF          = -1,
 356         PERF_COUNTER_STATE_INACTIVE     =  0,
 357         PERF_COUNTER_STATE_ACTIVE       =  1,
 358 };
 359
 360 struct file;
 361
 362 struct perf_mmap_data {
 363         struct rcu_head                 rcu_head;
 364         int                             nr_pages;       /* nr of data pages  */
 365         int                             nr_locked;      /* nr pages mlocked  */
 366
 367         atomic_t                        poll;           /* POLL_ for wakeups */
 368         atomic_t                        head;           /* write position    */
 369         atomic_t                        events;         /* event limit       */
 370
 371         atomic_t                        done_head;      /* completed head    */
 372         atomic_t                        lock;           /* concurrent writes */
 373
 374         atomic_t                        wakeup;         /* needs a wakeup    */
 375
 376         struct perf_counter_mmap_page   *user_page;
 377         void                            *data_pages[0];
 378 };
 379
 380 struct perf_pending_entry {
 381         struct perf_pending_entry *next;
 382         void (*func)(struct perf_pending_entry *);
 383 };
 384
 385 /**
 386  * struct perf_counter - performance counter kernel representation:
 387  */
 388 struct perf_counter {
 389 #ifdef CONFIG_PERF_COUNTERS
 390         struct list_head                list_entry;
 391         struct list_head                event_entry;
 392         struct list_head                sibling_list;
 393         int                             nr_siblings;
 394         struct perf_counter             *group_leader;
 395         const struct pmu                *pmu;
 396
 397         enum perf_counter_active_state  state;
 398         enum perf_counter_active_state  prev_state;
 399         atomic64_t                      count;
 400
 401         /*
 402          * These are the total time in nanoseconds that the counter
 403          * has been enabled (i.e. eligible to run, and the task has
 404          * been scheduled in, if this is a per-task counter)
 405          * and running (scheduled onto the CPU), respectively.
 406          *
 407          * They are computed from tstamp_enabled, tstamp_running and
 408          * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
 409          */
 410         u64                             total_time_enabled;
 411         u64                             total_time_running;
 412
 413         /*
 414          * These are timestamps used for computing total_time_enabled
 415          * and total_time_running when the counter is in INACTIVE or
 416          * ACTIVE state, measured in nanoseconds from an arbitrary point
 417          * in time.
 418          * tstamp_enabled: the notional time when the counter was enabled
 419          * tstamp_running: the notional time when the counter was scheduled on
 420          * tstamp_stopped: in INACTIVE state, the notional time when the
 421          *      counter was scheduled off.
 422          */
 423         u64                             tstamp_enabled;
 424         u64                             tstamp_running;
 425         u64                             tstamp_stopped;
 426
 427         struct perf_counter_hw_event    hw_event;
 428         struct hw_perf_counter          hw;
 429
 430         struct perf_counter_context     *ctx;
 431         struct task_struct              *task;
 432         struct file                     *filp;
 433
 434         struct perf_counter             *parent;
 435         struct list_head                child_list;
 436
 437         /*
 438          * These accumulate total time (in nanoseconds) that children
 439          * counters have been enabled and running, respectively.
 440          */
 441         atomic64_t                      child_total_time_enabled;
 442         atomic64_t                      child_total_time_running;
 443
 444         /*
 445          * Protect attach/detach and child_list:
 446          */
 447         struct mutex                    mutex;
 448
 449         int                             oncpu;
 450         int                             cpu;
 451
 452         /* mmap bits */
 453         struct mutex                    mmap_mutex;
 454         atomic_t                        mmap_count;
 455         struct perf_mmap_data           *data;
 456
 457         /* poll related */
 458         wait_queue_head_t               waitq;
 459         struct fasync_struct            *fasync;
 460
 461         /* delayed work for NMIs and such */
 462         int                             pending_wakeup;
 463         int                             pending_kill;
 464         int                             pending_disable;
 465         struct perf_pending_entry       pending;
 466
 467         atomic_t                        event_limit;
 468
 469         void (*destroy)(struct perf_counter *);
 470         struct rcu_head                 rcu_head;
 471 #endif
 472 };
 473
 474 /**
 475  * struct perf_counter_context - counter context structure
 476  *
 477  * Used as a container for task counters and CPU counters as well:
 478  */
 479 struct perf_counter_context {
 480 #ifdef CONFIG_PERF_COUNTERS
 481         /*
 482          * Protect the states of the counters in the list,
 483          * nr_active, and the list:
 484          */
 485         spinlock_t              lock;
 486         /*
 487          * Protect the list of counters.  Locking either mutex or lock
 488          * is sufficient to ensure the list doesn't change; to change
 489          * the list you need to lock both the mutex and the spinlock.
 490          */
 491         struct mutex            mutex;
 492
 493         struct list_head        counter_list;
 494         struct list_head        event_list;
 495         int                     nr_counters;
 496         int                     nr_active;
 497         int                     is_active;
 498         struct task_struct      *task;
 499
 500         /*
 501          * Context clock, runs when context enabled.
 502          */
 503         u64                     time;
 504         u64                     timestamp;
 505 #endif
 506 };
 507
 508 /**
 509  * struct perf_counter_cpu_context - per cpu counter context structure
 510  */
 511 struct perf_cpu_context {
 512         struct perf_counter_context     ctx;
 513         struct perf_counter_context     *task_ctx;
 514         int                             active_oncpu;
 515         int                             max_pertask;
 516         int                             exclusive;
 517
 518         /*
 519          * Recursion avoidance:
 520          *
 521          * task, softirq, irq, nmi context
 522          */
 523         int                     recursion[4];
 524 };
 525
 526 #ifdef CONFIG_PERF_COUNTERS
 527
 528 /*
 529  * Set by architecture code:
 530  */
 531 extern int perf_max_counters;
 532
 533 extern const struct pmu *hw_perf_counter_init(struct perf_counter *counter);
 534
 535 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
 536 extern void perf_counter_task_sched_out(struct task_struct *task, int cpu);
 537 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
 538 extern void perf_counter_init_task(struct task_struct *child);
 539 extern void perf_counter_exit_task(struct task_struct *child);
 540 extern void perf_counter_do_pending(void);
 541 extern void perf_counter_print_debug(void);
 542 extern void perf_counter_unthrottle(void);
 543 extern u64 hw_perf_save_disable(void);
 544 extern void hw_perf_restore(u64 ctrl);
 545 extern int perf_counter_task_disable(void);
 546 extern int perf_counter_task_enable(void);
 547 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
 548                struct perf_cpu_context *cpuctx,
 549                struct perf_counter_context *ctx, int cpu);
 550 extern void perf_counter_update_userpage(struct perf_counter *counter);
 551
 552 extern int perf_counter_overflow(struct perf_counter *counter,
 553                                  int nmi, struct pt_regs *regs, u64 addr);
 554 /*
 555  * Return 1 for a software counter, 0 for a hardware counter
 556  */
 557 static inline int is_software_counter(struct perf_counter *counter)
 558 {
 559         return !perf_event_raw(&counter->hw_event) &&
 560                 perf_event_type(&counter->hw_event) != PERF_TYPE_HARDWARE;
 561 }
 562
 563 extern void perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
 564
 565 extern void perf_counter_mmap(unsigned long addr, unsigned long len,
 566                               unsigned long pgoff, struct file *file);
 567
 568 extern void perf_counter_munmap(unsigned long addr, unsigned long len,
 569                                 unsigned long pgoff, struct file *file);
 570
 571 extern void perf_counter_comm(struct task_struct *tsk);
 572
 573 #define MAX_STACK_DEPTH         255
 574
 575 struct perf_callchain_entry {
 576         u16     nr, hv, kernel, user;
 577         u64     ip[MAX_STACK_DEPTH];
 578 };
 579
 580 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 581
 582 extern int sysctl_perf_counter_priv;
 583 extern int sysctl_perf_counter_mlock;
 584
 585 extern void perf_counter_init(void);
 586
 587 #else
 588 static inline void
 589 perf_counter_task_sched_in(struct task_struct *task, int cpu)           { }
 590 static inline void
 591 perf_counter_task_sched_out(struct task_struct *task, int cpu)          { }
 592 static inline void
 593 perf_counter_task_tick(struct task_struct *task, int cpu)               { }
 594 static inline void perf_counter_init_task(struct task_struct *child)    { }
 595 static inline void perf_counter_exit_task(struct task_struct *child)    { }
 596 static inline void perf_counter_do_pending(void)                        { }
 597 static inline void perf_counter_print_debug(void)                       { }
 598 static inline void perf_counter_unthrottle(void)                        { }
 599 static inline void hw_perf_restore(u64 ctrl)                            { }
 600 static inline u64 hw_perf_save_disable(void)                  { return 0; }
 601 static inline int perf_counter_task_disable(void)       { return -EINVAL; }
 602 static inline int perf_counter_task_enable(void)        { return -EINVAL; }
 603
 604 static inline void
 605 perf_swcounter_event(u32 event, u64 nr, int nmi,
 606                      struct pt_regs *regs, u64 addr)                    { }
 607
 608 static inline void
 609 perf_counter_mmap(unsigned long addr, unsigned long len,
 610                   unsigned long pgoff, struct file *file)               { }
 611
 612 static inline void
 613 perf_counter_munmap(unsigned long addr, unsigned long len,
 614                     unsigned long pgoff, struct file *file)             { }
 615
 616 static inline void perf_counter_comm(struct task_struct *tsk)           { }
 617 static inline void perf_counter_init(void)                              { }
 618 #endif
 619
 620 #endif /* __KERNEL__ */
 621 #endif /* _LINUX_PERF_COUNTER_H */