linux/include/linux/perf_event.h
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   1/*
   2 * Performance events:
   3 *
   4 *    Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
   5 *    Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
   6 *    Copyright (C) 2008-2011, 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_EVENT_H
  15#define _LINUX_PERF_EVENT_H
  16
  17#include <uapi/linux/perf_event.h>
  18
  19/*
  20 * Kernel-internal data types and definitions:
  21 */
  22
  23#ifdef CONFIG_PERF_EVENTS
  24# include <linux/cgroup.h>
  25# include <asm/perf_event.h>
  26# include <asm/local64.h>
  27#endif
  28
  29struct perf_guest_info_callbacks {
  30        int                             (*is_in_guest)(void);
  31        int                             (*is_user_mode)(void);
  32        unsigned long                   (*get_guest_ip)(void);
  33};
  34
  35#ifdef CONFIG_HAVE_HW_BREAKPOINT
  36#include <asm/hw_breakpoint.h>
  37#endif
  38
  39#include <linux/list.h>
  40#include <linux/mutex.h>
  41#include <linux/rculist.h>
  42#include <linux/rcupdate.h>
  43#include <linux/spinlock.h>
  44#include <linux/hrtimer.h>
  45#include <linux/fs.h>
  46#include <linux/pid_namespace.h>
  47#include <linux/workqueue.h>
  48#include <linux/ftrace.h>
  49#include <linux/cpu.h>
  50#include <linux/irq_work.h>
  51#include <linux/static_key.h>
  52#include <linux/atomic.h>
  53#include <linux/sysfs.h>
  54#include <linux/perf_regs.h>
  55#include <asm/local.h>
  56
  57struct perf_callchain_entry {
  58        __u64                           nr;
  59        __u64                           ip[PERF_MAX_STACK_DEPTH];
  60};
  61
  62struct perf_raw_record {
  63        u32                             size;
  64        void                            *data;
  65};
  66
  67/*
  68 * single taken branch record layout:
  69 *
  70 *      from: source instruction (may not always be a branch insn)
  71 *        to: branch target
  72 *   mispred: branch target was mispredicted
  73 * predicted: branch target was predicted
  74 *
  75 * support for mispred, predicted is optional. In case it
  76 * is not supported mispred = predicted = 0.
  77 */
  78struct perf_branch_entry {
  79        __u64   from;
  80        __u64   to;
  81        __u64   mispred:1,  /* target mispredicted */
  82                predicted:1,/* target predicted */
  83                reserved:62;
  84};
  85
  86/*
  87 * branch stack layout:
  88 *  nr: number of taken branches stored in entries[]
  89 *
  90 * Note that nr can vary from sample to sample
  91 * branches (to, from) are stored from most recent
  92 * to least recent, i.e., entries[0] contains the most
  93 * recent branch.
  94 */
  95struct perf_branch_stack {
  96        __u64                           nr;
  97        struct perf_branch_entry        entries[0];
  98};
  99
 100struct perf_regs_user {
 101        __u64           abi;
 102        struct pt_regs  *regs;
 103};
 104
 105struct task_struct;
 106
 107/*
 108 * extra PMU register associated with an event
 109 */
 110struct hw_perf_event_extra {
 111        u64             config; /* register value */
 112        unsigned int    reg;    /* register address or index */
 113        int             alloc;  /* extra register already allocated */
 114        int             idx;    /* index in shared_regs->regs[] */
 115};
 116
 117/**
 118 * struct hw_perf_event - performance event hardware details:
 119 */
 120struct hw_perf_event {
 121#ifdef CONFIG_PERF_EVENTS
 122        union {
 123                struct { /* hardware */
 124                        u64             config;
 125                        u64             last_tag;
 126                        unsigned long   config_base;
 127                        unsigned long   event_base;
 128                        int             event_base_rdpmc;
 129                        int             idx;
 130                        int             last_cpu;
 131
 132                        struct hw_perf_event_extra extra_reg;
 133                        struct hw_perf_event_extra branch_reg;
 134                };
 135                struct { /* software */
 136                        struct hrtimer  hrtimer;
 137                };
 138#ifdef CONFIG_HAVE_HW_BREAKPOINT
 139                struct { /* breakpoint */
 140                        struct arch_hw_breakpoint       info;
 141                        struct list_head                bp_list;
 142                        /*
 143                         * Crufty hack to avoid the chicken and egg
 144                         * problem hw_breakpoint has with context
 145                         * creation and event initalization.
 146                         */
 147                        struct task_struct              *bp_target;
 148                };
 149#endif
 150        };
 151        int                             state;
 152        local64_t                       prev_count;
 153        u64                             sample_period;
 154        u64                             last_period;
 155        local64_t                       period_left;
 156        u64                             interrupts_seq;
 157        u64                             interrupts;
 158
 159        u64                             freq_time_stamp;
 160        u64                             freq_count_stamp;
 161#endif
 162};
 163
 164/*
 165 * hw_perf_event::state flags
 166 */
 167#define PERF_HES_STOPPED        0x01 /* the counter is stopped */
 168#define PERF_HES_UPTODATE       0x02 /* event->count up-to-date */
 169#define PERF_HES_ARCH           0x04
 170
 171struct perf_event;
 172
 173/*
 174 * Common implementation detail of pmu::{start,commit,cancel}_txn
 175 */
 176#define PERF_EVENT_TXN 0x1
 177
 178/**
 179 * struct pmu - generic performance monitoring unit
 180 */
 181struct pmu {
 182        struct list_head                entry;
 183
 184        struct device                   *dev;
 185        const struct attribute_group    **attr_groups;
 186        char                            *name;
 187        int                             type;
 188
 189        int * __percpu                  pmu_disable_count;
 190        struct perf_cpu_context * __percpu pmu_cpu_context;
 191        int                             task_ctx_nr;
 192
 193        /*
 194         * Fully disable/enable this PMU, can be used to protect from the PMI
 195         * as well as for lazy/batch writing of the MSRs.
 196         */
 197        void (*pmu_enable)              (struct pmu *pmu); /* optional */
 198        void (*pmu_disable)             (struct pmu *pmu); /* optional */
 199
 200        /*
 201         * Try and initialize the event for this PMU.
 202         * Should return -ENOENT when the @event doesn't match this PMU.
 203         */
 204        int (*event_init)               (struct perf_event *event);
 205
 206#define PERF_EF_START   0x01            /* start the counter when adding    */
 207#define PERF_EF_RELOAD  0x02            /* reload the counter when starting */
 208#define PERF_EF_UPDATE  0x04            /* update the counter when stopping */
 209
 210        /*
 211         * Adds/Removes a counter to/from the PMU, can be done inside
 212         * a transaction, see the ->*_txn() methods.
 213         */
 214        int  (*add)                     (struct perf_event *event, int flags);
 215        void (*del)                     (struct perf_event *event, int flags);
 216
 217        /*
 218         * Starts/Stops a counter present on the PMU. The PMI handler
 219         * should stop the counter when perf_event_overflow() returns
 220         * !0. ->start() will be used to continue.
 221         */
 222        void (*start)                   (struct perf_event *event, int flags);
 223        void (*stop)                    (struct perf_event *event, int flags);
 224
 225        /*
 226         * Updates the counter value of the event.
 227         */
 228        void (*read)                    (struct perf_event *event);
 229
 230        /*
 231         * Group events scheduling is treated as a transaction, add
 232         * group events as a whole and perform one schedulability test.
 233         * If the test fails, roll back the whole group
 234         *
 235         * Start the transaction, after this ->add() doesn't need to
 236         * do schedulability tests.
 237         */
 238        void (*start_txn)               (struct pmu *pmu); /* optional */
 239        /*
 240         * If ->start_txn() disabled the ->add() schedulability test
 241         * then ->commit_txn() is required to perform one. On success
 242         * the transaction is closed. On error the transaction is kept
 243         * open until ->cancel_txn() is called.
 244         */
 245        int  (*commit_txn)              (struct pmu *pmu); /* optional */
 246        /*
 247         * Will cancel the transaction, assumes ->del() is called
 248         * for each successful ->add() during the transaction.
 249         */
 250        void (*cancel_txn)              (struct pmu *pmu); /* optional */
 251
 252        /*
 253         * Will return the value for perf_event_mmap_page::index for this event,
 254         * if no implementation is provided it will default to: event->hw.idx + 1.
 255         */
 256        int (*event_idx)                (struct perf_event *event); /*optional */
 257
 258        /*
 259         * flush branch stack on context-switches (needed in cpu-wide mode)
 260         */
 261        void (*flush_branch_stack)      (void);
 262};
 263
 264/**
 265 * enum perf_event_active_state - the states of a event
 266 */
 267enum perf_event_active_state {
 268        PERF_EVENT_STATE_ERROR          = -2,
 269        PERF_EVENT_STATE_OFF            = -1,
 270        PERF_EVENT_STATE_INACTIVE       =  0,
 271        PERF_EVENT_STATE_ACTIVE         =  1,
 272};
 273
 274struct file;
 275struct perf_sample_data;
 276
 277typedef void (*perf_overflow_handler_t)(struct perf_event *,
 278                                        struct perf_sample_data *,
 279                                        struct pt_regs *regs);
 280
 281enum perf_group_flag {
 282        PERF_GROUP_SOFTWARE             = 0x1,
 283};
 284
 285#define SWEVENT_HLIST_BITS              8
 286#define SWEVENT_HLIST_SIZE              (1 << SWEVENT_HLIST_BITS)
 287
 288struct swevent_hlist {
 289        struct hlist_head               heads[SWEVENT_HLIST_SIZE];
 290        struct rcu_head                 rcu_head;
 291};
 292
 293#define PERF_ATTACH_CONTEXT     0x01
 294#define PERF_ATTACH_GROUP       0x02
 295#define PERF_ATTACH_TASK        0x04
 296
 297#ifdef CONFIG_CGROUP_PERF
 298/*
 299 * perf_cgroup_info keeps track of time_enabled for a cgroup.
 300 * This is a per-cpu dynamically allocated data structure.
 301 */
 302struct perf_cgroup_info {
 303        u64                             time;
 304        u64                             timestamp;
 305};
 306
 307struct perf_cgroup {
 308        struct                          cgroup_subsys_state css;
 309        struct                          perf_cgroup_info *info; /* timing info, one per cpu */
 310};
 311#endif
 312
 313struct ring_buffer;
 314
 315/**
 316 * struct perf_event - performance event kernel representation:
 317 */
 318struct perf_event {
 319#ifdef CONFIG_PERF_EVENTS
 320        struct list_head                group_entry;
 321        struct list_head                event_entry;
 322        struct list_head                sibling_list;
 323        struct hlist_node               hlist_entry;
 324        int                             nr_siblings;
 325        int                             group_flags;
 326        struct perf_event               *group_leader;
 327        struct pmu                      *pmu;
 328
 329        enum perf_event_active_state    state;
 330        unsigned int                    attach_state;
 331        local64_t                       count;
 332        atomic64_t                      child_count;
 333
 334        /*
 335         * These are the total time in nanoseconds that the event
 336         * has been enabled (i.e. eligible to run, and the task has
 337         * been scheduled in, if this is a per-task event)
 338         * and running (scheduled onto the CPU), respectively.
 339         *
 340         * They are computed from tstamp_enabled, tstamp_running and
 341         * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
 342         */
 343        u64                             total_time_enabled;
 344        u64                             total_time_running;
 345
 346        /*
 347         * These are timestamps used for computing total_time_enabled
 348         * and total_time_running when the event is in INACTIVE or
 349         * ACTIVE state, measured in nanoseconds from an arbitrary point
 350         * in time.
 351         * tstamp_enabled: the notional time when the event was enabled
 352         * tstamp_running: the notional time when the event was scheduled on
 353         * tstamp_stopped: in INACTIVE state, the notional time when the
 354         *      event was scheduled off.
 355         */
 356        u64                             tstamp_enabled;
 357        u64                             tstamp_running;
 358        u64                             tstamp_stopped;
 359
 360        /*
 361         * timestamp shadows the actual context timing but it can
 362         * be safely used in NMI interrupt context. It reflects the
 363         * context time as it was when the event was last scheduled in.
 364         *
 365         * ctx_time already accounts for ctx->timestamp. Therefore to
 366         * compute ctx_time for a sample, simply add perf_clock().
 367         */
 368        u64                             shadow_ctx_time;
 369
 370        struct perf_event_attr          attr;
 371        u16                             header_size;
 372        u16                             id_header_size;
 373        u16                             read_size;
 374        struct hw_perf_event            hw;
 375
 376        struct perf_event_context       *ctx;
 377        atomic_long_t                   refcount;
 378
 379        /*
 380         * These accumulate total time (in nanoseconds) that children
 381         * events have been enabled and running, respectively.
 382         */
 383        atomic64_t                      child_total_time_enabled;
 384        atomic64_t                      child_total_time_running;
 385
 386        /*
 387         * Protect attach/detach and child_list:
 388         */
 389        struct mutex                    child_mutex;
 390        struct list_head                child_list;
 391        struct perf_event               *parent;
 392
 393        int                             oncpu;
 394        int                             cpu;
 395
 396        struct list_head                owner_entry;
 397        struct task_struct              *owner;
 398
 399        /* mmap bits */
 400        struct mutex                    mmap_mutex;
 401        atomic_t                        mmap_count;
 402        int                             mmap_locked;
 403        struct user_struct              *mmap_user;
 404        struct ring_buffer              *rb;
 405        struct list_head                rb_entry;
 406
 407        /* poll related */
 408        wait_queue_head_t               waitq;
 409        struct fasync_struct            *fasync;
 410
 411        /* delayed work for NMIs and such */
 412        int                             pending_wakeup;
 413        int                             pending_kill;
 414        int                             pending_disable;
 415        struct irq_work                 pending;
 416
 417        atomic_t                        event_limit;
 418
 419        void (*destroy)(struct perf_event *);
 420        struct rcu_head                 rcu_head;
 421
 422        struct pid_namespace            *ns;
 423        u64                             id;
 424
 425        perf_overflow_handler_t         overflow_handler;
 426        void                            *overflow_handler_context;
 427
 428#ifdef CONFIG_EVENT_TRACING
 429        struct ftrace_event_call        *tp_event;
 430        struct event_filter             *filter;
 431#ifdef CONFIG_FUNCTION_TRACER
 432        struct ftrace_ops               ftrace_ops;
 433#endif
 434#endif
 435
 436#ifdef CONFIG_CGROUP_PERF
 437        struct perf_cgroup              *cgrp; /* cgroup event is attach to */
 438        int                             cgrp_defer_enabled;
 439#endif
 440
 441#endif /* CONFIG_PERF_EVENTS */
 442};
 443
 444enum perf_event_context_type {
 445        task_context,
 446        cpu_context,
 447};
 448
 449/**
 450 * struct perf_event_context - event context structure
 451 *
 452 * Used as a container for task events and CPU events as well:
 453 */
 454struct perf_event_context {
 455        struct pmu                      *pmu;
 456        enum perf_event_context_type    type;
 457        /*
 458         * Protect the states of the events in the list,
 459         * nr_active, and the list:
 460         */
 461        raw_spinlock_t                  lock;
 462        /*
 463         * Protect the list of events.  Locking either mutex or lock
 464         * is sufficient to ensure the list doesn't change; to change
 465         * the list you need to lock both the mutex and the spinlock.
 466         */
 467        struct mutex                    mutex;
 468
 469        struct list_head                pinned_groups;
 470        struct list_head                flexible_groups;
 471        struct list_head                event_list;
 472        int                             nr_events;
 473        int                             nr_active;
 474        int                             is_active;
 475        int                             nr_stat;
 476        int                             nr_freq;
 477        int                             rotate_disable;
 478        atomic_t                        refcount;
 479        struct task_struct              *task;
 480
 481        /*
 482         * Context clock, runs when context enabled.
 483         */
 484        u64                             time;
 485        u64                             timestamp;
 486
 487        /*
 488         * These fields let us detect when two contexts have both
 489         * been cloned (inherited) from a common ancestor.
 490         */
 491        struct perf_event_context       *parent_ctx;
 492        u64                             parent_gen;
 493        u64                             generation;
 494        int                             pin_count;
 495        int                             nr_cgroups;      /* cgroup evts */
 496        int                             nr_branch_stack; /* branch_stack evt */
 497        struct rcu_head                 rcu_head;
 498};
 499
 500/*
 501 * Number of contexts where an event can trigger:
 502 *      task, softirq, hardirq, nmi.
 503 */
 504#define PERF_NR_CONTEXTS        4
 505
 506/**
 507 * struct perf_event_cpu_context - per cpu event context structure
 508 */
 509struct perf_cpu_context {
 510        struct perf_event_context       ctx;
 511        struct perf_event_context       *task_ctx;
 512        int                             active_oncpu;
 513        int                             exclusive;
 514        struct list_head                rotation_list;
 515        int                             jiffies_interval;
 516        struct pmu                      *unique_pmu;
 517        struct perf_cgroup              *cgrp;
 518};
 519
 520struct perf_output_handle {
 521        struct perf_event               *event;
 522        struct ring_buffer              *rb;
 523        unsigned long                   wakeup;
 524        unsigned long                   size;
 525        void                            *addr;
 526        int                             page;
 527};
 528
 529#ifdef CONFIG_PERF_EVENTS
 530
 531extern int perf_pmu_register(struct pmu *pmu, char *name, int type);
 532extern void perf_pmu_unregister(struct pmu *pmu);
 533
 534extern int perf_num_counters(void);
 535extern const char *perf_pmu_name(void);
 536extern void __perf_event_task_sched_in(struct task_struct *prev,
 537                                       struct task_struct *task);
 538extern void __perf_event_task_sched_out(struct task_struct *prev,
 539                                        struct task_struct *next);
 540extern int perf_event_init_task(struct task_struct *child);
 541extern void perf_event_exit_task(struct task_struct *child);
 542extern void perf_event_free_task(struct task_struct *task);
 543extern void perf_event_delayed_put(struct task_struct *task);
 544extern void perf_event_print_debug(void);
 545extern void perf_pmu_disable(struct pmu *pmu);
 546extern void perf_pmu_enable(struct pmu *pmu);
 547extern int perf_event_task_disable(void);
 548extern int perf_event_task_enable(void);
 549extern int perf_event_refresh(struct perf_event *event, int refresh);
 550extern void perf_event_update_userpage(struct perf_event *event);
 551extern int perf_event_release_kernel(struct perf_event *event);
 552extern struct perf_event *
 553perf_event_create_kernel_counter(struct perf_event_attr *attr,
 554                                int cpu,
 555                                struct task_struct *task,
 556                                perf_overflow_handler_t callback,
 557                                void *context);
 558extern void perf_pmu_migrate_context(struct pmu *pmu,
 559                                int src_cpu, int dst_cpu);
 560extern u64 perf_event_read_value(struct perf_event *event,
 561                                 u64 *enabled, u64 *running);
 562
 563
 564struct perf_sample_data {
 565        u64                             type;
 566
 567        u64                             ip;
 568        struct {
 569                u32     pid;
 570                u32     tid;
 571        }                               tid_entry;
 572        u64                             time;
 573        u64                             addr;
 574        u64                             id;
 575        u64                             stream_id;
 576        struct {
 577                u32     cpu;
 578                u32     reserved;
 579        }                               cpu_entry;
 580        u64                             period;
 581        struct perf_callchain_entry     *callchain;
 582        struct perf_raw_record          *raw;
 583        struct perf_branch_stack        *br_stack;
 584        struct perf_regs_user           regs_user;
 585        u64                             stack_user_size;
 586};
 587
 588static inline void perf_sample_data_init(struct perf_sample_data *data,
 589                                         u64 addr, u64 period)
 590{
 591        /* remaining struct members initialized in perf_prepare_sample() */
 592        data->addr = addr;
 593        data->raw  = NULL;
 594        data->br_stack = NULL;
 595        data->period = period;
 596        data->regs_user.abi = PERF_SAMPLE_REGS_ABI_NONE;
 597        data->regs_user.regs = NULL;
 598        data->stack_user_size = 0;
 599}
 600
 601extern void perf_output_sample(struct perf_output_handle *handle,
 602                               struct perf_event_header *header,
 603                               struct perf_sample_data *data,
 604                               struct perf_event *event);
 605extern void perf_prepare_sample(struct perf_event_header *header,
 606                                struct perf_sample_data *data,
 607                                struct perf_event *event,
 608                                struct pt_regs *regs);
 609
 610extern int perf_event_overflow(struct perf_event *event,
 611                                 struct perf_sample_data *data,
 612                                 struct pt_regs *regs);
 613
 614static inline bool is_sampling_event(struct perf_event *event)
 615{
 616        return event->attr.sample_period != 0;
 617}
 618
 619/*
 620 * Return 1 for a software event, 0 for a hardware event
 621 */
 622static inline int is_software_event(struct perf_event *event)
 623{
 624        return event->pmu->task_ctx_nr == perf_sw_context;
 625}
 626
 627extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
 628
 629extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
 630
 631#ifndef perf_arch_fetch_caller_regs
 632static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
 633#endif
 634
 635/*
 636 * Take a snapshot of the regs. Skip ip and frame pointer to
 637 * the nth caller. We only need a few of the regs:
 638 * - ip for PERF_SAMPLE_IP
 639 * - cs for user_mode() tests
 640 * - bp for callchains
 641 * - eflags, for future purposes, just in case
 642 */
 643static inline void perf_fetch_caller_regs(struct pt_regs *regs)
 644{
 645        memset(regs, 0, sizeof(*regs));
 646
 647        perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
 648}
 649
 650static __always_inline void
 651perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
 652{
 653        struct pt_regs hot_regs;
 654
 655        if (static_key_false(&perf_swevent_enabled[event_id])) {
 656                if (!regs) {
 657                        perf_fetch_caller_regs(&hot_regs);
 658                        regs = &hot_regs;
 659                }
 660                __perf_sw_event(event_id, nr, regs, addr);
 661        }
 662}
 663
 664extern struct static_key_deferred perf_sched_events;
 665
 666static inline void perf_event_task_sched_in(struct task_struct *prev,
 667                                            struct task_struct *task)
 668{
 669        if (static_key_false(&perf_sched_events.key))
 670                __perf_event_task_sched_in(prev, task);
 671}
 672
 673static inline void perf_event_task_sched_out(struct task_struct *prev,
 674                                             struct task_struct *next)
 675{
 676        perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0);
 677
 678        if (static_key_false(&perf_sched_events.key))
 679                __perf_event_task_sched_out(prev, next);
 680}
 681
 682extern void perf_event_mmap(struct vm_area_struct *vma);
 683extern struct perf_guest_info_callbacks *perf_guest_cbs;
 684extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 685extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 686
 687extern void perf_event_comm(struct task_struct *tsk);
 688extern void perf_event_fork(struct task_struct *tsk);
 689
 690/* Callchains */
 691DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
 692
 693extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
 694extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
 695
 696static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
 697{
 698        if (entry->nr < PERF_MAX_STACK_DEPTH)
 699                entry->ip[entry->nr++] = ip;
 700}
 701
 702extern int sysctl_perf_event_paranoid;
 703extern int sysctl_perf_event_mlock;
 704extern int sysctl_perf_event_sample_rate;
 705
 706extern int perf_proc_update_handler(struct ctl_table *table, int write,
 707                void __user *buffer, size_t *lenp,
 708                loff_t *ppos);
 709
 710static inline bool perf_paranoid_tracepoint_raw(void)
 711{
 712        return sysctl_perf_event_paranoid > -1;
 713}
 714
 715static inline bool perf_paranoid_cpu(void)
 716{
 717        return sysctl_perf_event_paranoid > 0;
 718}
 719
 720static inline bool perf_paranoid_kernel(void)
 721{
 722        return sysctl_perf_event_paranoid > 1;
 723}
 724
 725extern void perf_event_init(void);
 726extern void perf_tp_event(u64 addr, u64 count, void *record,
 727                          int entry_size, struct pt_regs *regs,
 728                          struct hlist_head *head, int rctx,
 729                          struct task_struct *task);
 730extern void perf_bp_event(struct perf_event *event, void *data);
 731
 732#ifndef perf_misc_flags
 733# define perf_misc_flags(regs) \
 734                (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
 735# define perf_instruction_pointer(regs) instruction_pointer(regs)
 736#endif
 737
 738static inline bool has_branch_stack(struct perf_event *event)
 739{
 740        return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
 741}
 742
 743extern int perf_output_begin(struct perf_output_handle *handle,
 744                             struct perf_event *event, unsigned int size);
 745extern void perf_output_end(struct perf_output_handle *handle);
 746extern unsigned int perf_output_copy(struct perf_output_handle *handle,
 747                             const void *buf, unsigned int len);
 748extern unsigned int perf_output_skip(struct perf_output_handle *handle,
 749                                     unsigned int len);
 750extern int perf_swevent_get_recursion_context(void);
 751extern void perf_swevent_put_recursion_context(int rctx);
 752extern void perf_event_enable(struct perf_event *event);
 753extern void perf_event_disable(struct perf_event *event);
 754extern int __perf_event_disable(void *info);
 755extern void perf_event_task_tick(void);
 756#else
 757static inline void
 758perf_event_task_sched_in(struct task_struct *prev,
 759                         struct task_struct *task)                      { }
 760static inline void
 761perf_event_task_sched_out(struct task_struct *prev,
 762                          struct task_struct *next)                     { }
 763static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
 764static inline void perf_event_exit_task(struct task_struct *child)      { }
 765static inline void perf_event_free_task(struct task_struct *task)       { }
 766static inline void perf_event_delayed_put(struct task_struct *task)     { }
 767static inline void perf_event_print_debug(void)                         { }
 768static inline int perf_event_task_disable(void)                         { return -EINVAL; }
 769static inline int perf_event_task_enable(void)                          { return -EINVAL; }
 770static inline int perf_event_refresh(struct perf_event *event, int refresh)
 771{
 772        return -EINVAL;
 773}
 774
 775static inline void
 776perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)     { }
 777static inline void
 778perf_bp_event(struct perf_event *event, void *data)                     { }
 779
 780static inline int perf_register_guest_info_callbacks
 781(struct perf_guest_info_callbacks *callbacks)                           { return 0; }
 782static inline int perf_unregister_guest_info_callbacks
 783(struct perf_guest_info_callbacks *callbacks)                           { return 0; }
 784
 785static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
 786static inline void perf_event_comm(struct task_struct *tsk)             { }
 787static inline void perf_event_fork(struct task_struct *tsk)             { }
 788static inline void perf_event_init(void)                                { }
 789static inline int  perf_swevent_get_recursion_context(void)             { return -1; }
 790static inline void perf_swevent_put_recursion_context(int rctx)         { }
 791static inline void perf_event_enable(struct perf_event *event)          { }
 792static inline void perf_event_disable(struct perf_event *event)         { }
 793static inline int __perf_event_disable(void *info)                      { return -1; }
 794static inline void perf_event_task_tick(void)                           { }
 795#endif
 796
 797#define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
 798
 799/*
 800 * This has to have a higher priority than migration_notifier in sched.c.
 801 */
 802#define perf_cpu_notifier(fn)                                           \
 803do {                                                                    \
 804        static struct notifier_block fn##_nb __cpuinitdata =            \
 805                { .notifier_call = fn, .priority = CPU_PRI_PERF };      \
 806        unsigned long cpu = smp_processor_id();                         \
 807        unsigned long flags;                                            \
 808        fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,                     \
 809                (void *)(unsigned long)cpu);                            \
 810        local_irq_save(flags);                                          \
 811        fn(&fn##_nb, (unsigned long)CPU_STARTING,                       \
 812                (void *)(unsigned long)cpu);                            \
 813        local_irq_restore(flags);                                       \
 814        fn(&fn##_nb, (unsigned long)CPU_ONLINE,                         \
 815                (void *)(unsigned long)cpu);                            \
 816        register_cpu_notifier(&fn##_nb);                                \
 817} while (0)
 818
 819
 820#define PMU_FORMAT_ATTR(_name, _format)                                 \
 821static ssize_t                                                          \
 822_name##_show(struct device *dev,                                        \
 823                               struct device_attribute *attr,           \
 824                               char *page)                              \
 825{                                                                       \
 826        BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);                     \
 827        return sprintf(page, _format "\n");                             \
 828}                                                                       \
 829                                                                        \
 830static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
 831
 832#endif /* _LINUX_PERF_EVENT_H */
 833
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