include/linux/perf_event.h

   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 <asm/perf_event.h>
  25 # include <asm/local64.h>
  26 #endif
  27
  28 struct perf_guest_info_callbacks {
  29         int                             (*is_in_guest)(void);
  30         int                             (*is_user_mode)(void);
  31         unsigned long                   (*get_guest_ip)(void);
  32 };
  33
  34 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  35 #include <asm/hw_breakpoint.h>
  36 #endif
  37
  38 #include <linux/list.h>
  39 #include <linux/mutex.h>
  40 #include <linux/rculist.h>
  41 #include <linux/rcupdate.h>
  42 #include <linux/spinlock.h>
  43 #include <linux/hrtimer.h>
  44 #include <linux/fs.h>
  45 #include <linux/pid_namespace.h>
  46 #include <linux/workqueue.h>
  47 #include <linux/ftrace.h>
  48 #include <linux/cpu.h>
  49 #include <linux/irq_work.h>
  50 #include <linux/static_key.h>
  51 #include <linux/atomic.h>
  52 #include <linux/sysfs.h>
  53 #include <linux/perf_regs.h>
  54 #include <asm/local.h>
  55
  56 struct perf_callchain_entry {
  57         __u64                           nr;
  58         __u64                           ip[PERF_MAX_STACK_DEPTH];
  59 };
  60
  61 struct perf_raw_record {
  62         u32                             size;
  63         void                            *data;
  64 };
  65
  66 /*
  67  * branch stack layout:
  68  *  nr: number of taken branches stored in entries[]
  69  *
  70  * Note that nr can vary from sample to sample
  71  * branches (to, from) are stored from most recent
  72  * to least recent, i.e., entries[0] contains the most
  73  * recent branch.
  74  */
  75 struct perf_branch_stack {
  76         __u64                           nr;
  77         struct perf_branch_entry        entries[0];
  78 };
  79
  80 struct perf_regs_user {
  81         __u64           abi;
  82         struct pt_regs  *regs;
  83 };
  84
  85 struct task_struct;
  86
  87 /*
  88  * extra PMU register associated with an event
  89  */
  90 struct hw_perf_event_extra {
  91         u64             config; /* register value */
  92         unsigned int    reg;    /* register address or index */
  93         int             alloc;  /* extra register already allocated */
  94         int             idx;    /* index in shared_regs->regs[] */
  95 };
  96
  97 struct event_constraint;
  98
  99 /**
 100  * struct hw_perf_event - performance event hardware details:
 101  */
 102 struct hw_perf_event {
 103 #ifdef CONFIG_PERF_EVENTS
 104         union {
 105                 struct { /* hardware */
 106                         u64             config;
 107                         u64             last_tag;
 108                         unsigned long   config_base;
 109                         unsigned long   event_base;
 110                         int             event_base_rdpmc;
 111                         int             idx;
 112                         int             last_cpu;
 113                         int             flags;
 114
 115                         struct hw_perf_event_extra extra_reg;
 116                         struct hw_perf_event_extra branch_reg;
 117
 118                         struct event_constraint *constraint;
 119                 };
 120                 struct { /* software */
 121                         struct hrtimer  hrtimer;
 122                 };
 123                 struct { /* tracepoint */
 124                         struct task_struct      *tp_target;
 125                         /* for tp_event->class */
 126                         struct list_head        tp_list;
 127                 };
 128 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 129                 struct { /* breakpoint */
 130                         /*
 131                          * Crufty hack to avoid the chicken and egg
 132                          * problem hw_breakpoint has with context
 133                          * creation and event initalization.
 134                          */
 135                         struct task_struct              *bp_target;
 136                         struct arch_hw_breakpoint       info;
 137                         struct list_head                bp_list;
 138                 };
 139 #endif
 140         };
 141         int                             state;
 142         local64_t                       prev_count;
 143         u64                             sample_period;
 144         u64                             last_period;
 145         local64_t                       period_left;
 146         u64                             interrupts_seq;
 147         u64                             interrupts;
 148
 149         u64                             freq_time_stamp;
 150         u64                             freq_count_stamp;
 151 #endif
 152 };
 153
 154 /*
 155  * hw_perf_event::state flags
 156  */
 157 #define PERF_HES_STOPPED        0x01 /* the counter is stopped */
 158 #define PERF_HES_UPTODATE       0x02 /* event->count up-to-date */
 159 #define PERF_HES_ARCH           0x04
 160
 161 struct perf_event;
 162
 163 /*
 164  * Common implementation detail of pmu::{start,commit,cancel}_txn
 165  */
 166 #define PERF_EVENT_TXN 0x1
 167
 168 /**
 169  * struct pmu - generic performance monitoring unit
 170  */
 171 struct pmu {
 172         struct list_head                entry;
 173
 174         struct device                   *dev;
 175         const struct attribute_group    **attr_groups;
 176         const char                      *name;
 177         int                             type;
 178
 179         int * __percpu                  pmu_disable_count;
 180         struct perf_cpu_context * __percpu pmu_cpu_context;
 181         int                             task_ctx_nr;
 182         int                             hrtimer_interval_ms;
 183
 184         /*
 185          * Fully disable/enable this PMU, can be used to protect from the PMI
 186          * as well as for lazy/batch writing of the MSRs.
 187          */
 188         void (*pmu_enable)              (struct pmu *pmu); /* optional */
 189         void (*pmu_disable)             (struct pmu *pmu); /* optional */
 190
 191         /*
 192          * Try and initialize the event for this PMU.
 193          * Should return -ENOENT when the @event doesn't match this PMU.
 194          */
 195         int (*event_init)               (struct perf_event *event);
 196
 197 #define PERF_EF_START   0x01            /* start the counter when adding    */
 198 #define PERF_EF_RELOAD  0x02            /* reload the counter when starting */
 199 #define PERF_EF_UPDATE  0x04            /* update the counter when stopping */
 200
 201         /*
 202          * Adds/Removes a counter to/from the PMU, can be done inside
 203          * a transaction, see the ->*_txn() methods.
 204          */
 205         int  (*add)                     (struct perf_event *event, int flags);
 206         void (*del)                     (struct perf_event *event, int flags);
 207
 208         /*
 209          * Starts/Stops a counter present on the PMU. The PMI handler
 210          * should stop the counter when perf_event_overflow() returns
 211          * !0. ->start() will be used to continue.
 212          */
 213         void (*start)                   (struct perf_event *event, int flags);
 214         void (*stop)                    (struct perf_event *event, int flags);
 215
 216         /*
 217          * Updates the counter value of the event.
 218          */
 219         void (*read)                    (struct perf_event *event);
 220
 221         /*
 222          * Group events scheduling is treated as a transaction, add
 223          * group events as a whole and perform one schedulability test.
 224          * If the test fails, roll back the whole group
 225          *
 226          * Start the transaction, after this ->add() doesn't need to
 227          * do schedulability tests.
 228          */
 229         void (*start_txn)               (struct pmu *pmu); /* optional */
 230         /*
 231          * If ->start_txn() disabled the ->add() schedulability test
 232          * then ->commit_txn() is required to perform one. On success
 233          * the transaction is closed. On error the transaction is kept
 234          * open until ->cancel_txn() is called.
 235          */
 236         int  (*commit_txn)              (struct pmu *pmu); /* optional */
 237         /*
 238          * Will cancel the transaction, assumes ->del() is called
 239          * for each successful ->add() during the transaction.
 240          */
 241         void (*cancel_txn)              (struct pmu *pmu); /* optional */
 242
 243         /*
 244          * Will return the value for perf_event_mmap_page::index for this event,
 245          * if no implementation is provided it will default to: event->hw.idx + 1.
 246          */
 247         int (*event_idx)                (struct perf_event *event); /*optional */
 248
 249         /*
 250          * flush branch stack on context-switches (needed in cpu-wide mode)
 251          */
 252         void (*flush_branch_stack)      (void);
 253 };
 254
 255 /**
 256  * enum perf_event_active_state - the states of a event
 257  */
 258 enum perf_event_active_state {
 259         PERF_EVENT_STATE_ERROR          = -2,
 260         PERF_EVENT_STATE_OFF            = -1,
 261         PERF_EVENT_STATE_INACTIVE       =  0,
 262         PERF_EVENT_STATE_ACTIVE         =  1,
 263 };
 264
 265 struct file;
 266 struct perf_sample_data;
 267
 268 typedef void (*perf_overflow_handler_t)(struct perf_event *,
 269                                         struct perf_sample_data *,
 270                                         struct pt_regs *regs);
 271
 272 enum perf_group_flag {
 273         PERF_GROUP_SOFTWARE             = 0x1,
 274 };
 275
 276 #define SWEVENT_HLIST_BITS              8
 277 #define SWEVENT_HLIST_SIZE              (1 << SWEVENT_HLIST_BITS)
 278
 279 struct swevent_hlist {
 280         struct hlist_head               heads[SWEVENT_HLIST_SIZE];
 281         struct rcu_head                 rcu_head;
 282 };
 283
 284 #define PERF_ATTACH_CONTEXT     0x01
 285 #define PERF_ATTACH_GROUP       0x02
 286 #define PERF_ATTACH_TASK        0x04
 287
 288 struct perf_cgroup;
 289 struct ring_buffer;
 290
 291 /**
 292  * struct perf_event - performance event kernel representation:
 293  */
 294 struct perf_event {
 295 #ifdef CONFIG_PERF_EVENTS
 296         struct list_head                group_entry;
 297         struct list_head                event_entry;
 298         struct list_head                sibling_list;
 299         struct hlist_node               hlist_entry;
 300         int                             nr_siblings;
 301         int                             group_flags;
 302         struct perf_event               *group_leader;
 303         struct pmu                      *pmu;
 304
 305         enum perf_event_active_state    state;
 306         unsigned int                    attach_state;
 307         local64_t                       count;
 308         atomic64_t                      child_count;
 309
 310         /*
 311          * These are the total time in nanoseconds that the event
 312          * has been enabled (i.e. eligible to run, and the task has
 313          * been scheduled in, if this is a per-task event)
 314          * and running (scheduled onto the CPU), respectively.
 315          *
 316          * They are computed from tstamp_enabled, tstamp_running and
 317          * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
 318          */
 319         u64                             total_time_enabled;
 320         u64                             total_time_running;
 321
 322         /*
 323          * These are timestamps used for computing total_time_enabled
 324          * and total_time_running when the event is in INACTIVE or
 325          * ACTIVE state, measured in nanoseconds from an arbitrary point
 326          * in time.
 327          * tstamp_enabled: the notional time when the event was enabled
 328          * tstamp_running: the notional time when the event was scheduled on
 329          * tstamp_stopped: in INACTIVE state, the notional time when the
 330          *      event was scheduled off.
 331          */
 332         u64                             tstamp_enabled;
 333         u64                             tstamp_running;
 334         u64                             tstamp_stopped;
 335
 336         /*
 337          * timestamp shadows the actual context timing but it can
 338          * be safely used in NMI interrupt context. It reflects the
 339          * context time as it was when the event was last scheduled in.
 340          *
 341          * ctx_time already accounts for ctx->timestamp. Therefore to
 342          * compute ctx_time for a sample, simply add perf_clock().
 343          */
 344         u64                             shadow_ctx_time;
 345
 346         struct perf_event_attr          attr;
 347         u16                             header_size;
 348         u16                             id_header_size;
 349         u16                             read_size;
 350         struct hw_perf_event            hw;
 351
 352         struct perf_event_context       *ctx;
 353         atomic_long_t                   refcount;
 354
 355         /*
 356          * These accumulate total time (in nanoseconds) that children
 357          * events have been enabled and running, respectively.
 358          */
 359         atomic64_t                      child_total_time_enabled;
 360         atomic64_t                      child_total_time_running;
 361
 362         /*
 363          * Protect attach/detach and child_list:
 364          */
 365         struct mutex                    child_mutex;
 366         struct list_head                child_list;
 367         struct perf_event               *parent;
 368
 369         int                             oncpu;
 370         int                             cpu;
 371
 372         struct list_head                owner_entry;
 373         struct task_struct              *owner;
 374
 375         /* mmap bits */
 376         struct mutex                    mmap_mutex;
 377         atomic_t                        mmap_count;
 378
 379         struct ring_buffer              *rb;
 380         struct list_head                rb_entry;
 381
 382         /* poll related */
 383         wait_queue_head_t               waitq;
 384         struct fasync_struct            *fasync;
 385
 386         /* delayed work for NMIs and such */
 387         int                             pending_wakeup;
 388         int                             pending_kill;
 389         int                             pending_disable;
 390         struct irq_work                 pending;
 391
 392         atomic_t                        event_limit;
 393
 394         void (*destroy)(struct perf_event *);
 395         struct rcu_head                 rcu_head;
 396
 397         struct pid_namespace            *ns;
 398         u64                             id;
 399
 400         perf_overflow_handler_t         overflow_handler;
 401         void                            *overflow_handler_context;
 402
 403 #ifdef CONFIG_EVENT_TRACING
 404         struct ftrace_event_call        *tp_event;
 405         struct event_filter             *filter;
 406 #ifdef CONFIG_FUNCTION_TRACER
 407         struct ftrace_ops               ftrace_ops;
 408 #endif
 409 #endif
 410
 411 #ifdef CONFIG_CGROUP_PERF
 412         struct perf_cgroup              *cgrp; /* cgroup event is attach to */
 413         int                             cgrp_defer_enabled;
 414 #endif
 415
 416 #endif /* CONFIG_PERF_EVENTS */
 417 };
 418
 419 enum perf_event_context_type {
 420         task_context,
 421         cpu_context,
 422 };
 423
 424 /**
 425  * struct perf_event_context - event context structure
 426  *
 427  * Used as a container for task events and CPU events as well:
 428  */
 429 struct perf_event_context {
 430         struct pmu                      *pmu;
 431         enum perf_event_context_type    type;
 432         /*
 433          * Protect the states of the events in the list,
 434          * nr_active, and the list:
 435          */
 436         raw_spinlock_t                  lock;
 437         /*
 438          * Protect the list of events.  Locking either mutex or lock
 439          * is sufficient to ensure the list doesn't change; to change
 440          * the list you need to lock both the mutex and the spinlock.
 441          */
 442         struct mutex                    mutex;
 443
 444         struct list_head                pinned_groups;
 445         struct list_head                flexible_groups;
 446         struct list_head                event_list;
 447         int                             nr_events;
 448         int                             nr_active;
 449         int                             is_active;
 450         int                             nr_stat;
 451         int                             nr_freq;
 452         int                             rotate_disable;
 453         atomic_t                        refcount;
 454         struct task_struct              *task;
 455
 456         /*
 457          * Context clock, runs when context enabled.
 458          */
 459         u64                             time;
 460         u64                             timestamp;
 461
 462         /*
 463          * These fields let us detect when two contexts have both
 464          * been cloned (inherited) from a common ancestor.
 465          */
 466         struct perf_event_context       *parent_ctx;
 467         u64                             parent_gen;
 468         u64                             generation;
 469         int                             pin_count;
 470         int                             nr_cgroups;      /* cgroup evts */
 471         int                             nr_branch_stack; /* branch_stack evt */
 472         struct rcu_head                 rcu_head;
 473 };
 474
 475 /*
 476  * Number of contexts where an event can trigger:
 477  *      task, softirq, hardirq, nmi.
 478  */
 479 #define PERF_NR_CONTEXTS        4
 480
 481 /**
 482  * struct perf_event_cpu_context - per cpu event context structure
 483  */
 484 struct perf_cpu_context {
 485         struct perf_event_context       ctx;
 486         struct perf_event_context       *task_ctx;
 487         int                             active_oncpu;
 488         int                             exclusive;
 489         struct hrtimer                  hrtimer;
 490         ktime_t                         hrtimer_interval;
 491         struct list_head                rotation_list;
 492         struct pmu                      *unique_pmu;
 493         struct perf_cgroup              *cgrp;
 494 };
 495
 496 struct perf_output_handle {
 497         struct perf_event               *event;
 498         struct ring_buffer              *rb;
 499         unsigned long                   wakeup;
 500         unsigned long                   size;
 501         void                            *addr;
 502         int                             page;
 503 };
 504
 505 #ifdef CONFIG_PERF_EVENTS
 506
 507 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
 508 extern void perf_pmu_unregister(struct pmu *pmu);
 509
 510 extern int perf_num_counters(void);
 511 extern const char *perf_pmu_name(void);
 512 extern void __perf_event_task_sched_in(struct task_struct *prev,
 513                                        struct task_struct *task);
 514 extern void __perf_event_task_sched_out(struct task_struct *prev,
 515                                         struct task_struct *next);
 516 extern int perf_event_init_task(struct task_struct *child);
 517 extern void perf_event_exit_task(struct task_struct *child);
 518 extern void perf_event_free_task(struct task_struct *task);
 519 extern void perf_event_delayed_put(struct task_struct *task);
 520 extern void perf_event_print_debug(void);
 521 extern void perf_pmu_disable(struct pmu *pmu);
 522 extern void perf_pmu_enable(struct pmu *pmu);
 523 extern int perf_event_task_disable(void);
 524 extern int perf_event_task_enable(void);
 525 extern int perf_event_refresh(struct perf_event *event, int refresh);
 526 extern void perf_event_update_userpage(struct perf_event *event);
 527 extern int perf_event_release_kernel(struct perf_event *event);
 528 extern struct perf_event *
 529 perf_event_create_kernel_counter(struct perf_event_attr *attr,
 530                                 int cpu,
 531                                 struct task_struct *task,
 532                                 perf_overflow_handler_t callback,
 533                                 void *context);
 534 extern void perf_pmu_migrate_context(struct pmu *pmu,
 535                                 int src_cpu, int dst_cpu);
 536 extern u64 perf_event_read_value(struct perf_event *event,
 537                                  u64 *enabled, u64 *running);
 538
 539
 540 struct perf_sample_data {
 541         u64                             type;
 542
 543         u64                             ip;
 544         struct {
 545                 u32     pid;
 546                 u32     tid;
 547         }                               tid_entry;
 548         u64                             time;
 549         u64                             addr;
 550         u64                             id;
 551         u64                             stream_id;
 552         struct {
 553                 u32     cpu;
 554                 u32     reserved;
 555         }                               cpu_entry;
 556         u64                             period;
 557         union  perf_mem_data_src        data_src;
 558         struct perf_callchain_entry     *callchain;
 559         struct perf_raw_record          *raw;
 560         struct perf_branch_stack        *br_stack;
 561         struct perf_regs_user           regs_user;
 562         u64                             stack_user_size;
 563         u64                             weight;
 564 };
 565
 566 static inline void perf_sample_data_init(struct perf_sample_data *data,
 567                                          u64 addr, u64 period)
 568 {
 569         /* remaining struct members initialized in perf_prepare_sample() */
 570         data->addr = addr;
 571         data->raw  = NULL;
 572         data->br_stack = NULL;
 573         data->period = period;
 574         data->regs_user.abi = PERF_SAMPLE_REGS_ABI_NONE;
 575         data->regs_user.regs = NULL;
 576         data->stack_user_size = 0;
 577         data->weight = 0;
 578         data->data_src.val = 0;
 579 }
 580
 581 extern void perf_output_sample(struct perf_output_handle *handle,
 582                                struct perf_event_header *header,
 583                                struct perf_sample_data *data,
 584                                struct perf_event *event);
 585 extern void perf_prepare_sample(struct perf_event_header *header,
 586                                 struct perf_sample_data *data,
 587                                 struct perf_event *event,
 588                                 struct pt_regs *regs);
 589
 590 extern int perf_event_overflow(struct perf_event *event,
 591                                  struct perf_sample_data *data,
 592                                  struct pt_regs *regs);
 593
 594 static inline bool is_sampling_event(struct perf_event *event)
 595 {
 596         return event->attr.sample_period != 0;
 597 }
 598
 599 /*
 600  * Return 1 for a software event, 0 for a hardware event
 601  */
 602 static inline int is_software_event(struct perf_event *event)
 603 {
 604         return event->pmu->task_ctx_nr == perf_sw_context;
 605 }
 606
 607 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
 608
 609 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
 610
 611 #ifndef perf_arch_fetch_caller_regs
 612 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
 613 #endif
 614
 615 /*
 616  * Take a snapshot of the regs. Skip ip and frame pointer to
 617  * the nth caller. We only need a few of the regs:
 618  * - ip for PERF_SAMPLE_IP
 619  * - cs for user_mode() tests
 620  * - bp for callchains
 621  * - eflags, for future purposes, just in case
 622  */
 623 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
 624 {
 625         memset(regs, 0, sizeof(*regs));
 626
 627         perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
 628 }
 629
 630 static __always_inline void
 631 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
 632 {
 633         struct pt_regs hot_regs;
 634
 635         if (static_key_false(&perf_swevent_enabled[event_id])) {
 636                 if (!regs) {
 637                         perf_fetch_caller_regs(&hot_regs);
 638                         regs = &hot_regs;
 639                 }
 640                 __perf_sw_event(event_id, nr, regs, addr);
 641         }
 642 }
 643
 644 extern struct static_key_deferred perf_sched_events;
 645
 646 static inline void perf_event_task_sched_in(struct task_struct *prev,
 647                                             struct task_struct *task)
 648 {
 649         if (static_key_false(&perf_sched_events.key))
 650                 __perf_event_task_sched_in(prev, task);
 651 }
 652
 653 static inline void perf_event_task_sched_out(struct task_struct *prev,
 654                                              struct task_struct *next)
 655 {
 656         perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0);
 657
 658         if (static_key_false(&perf_sched_events.key))
 659                 __perf_event_task_sched_out(prev, next);
 660 }
 661
 662 extern void perf_event_mmap(struct vm_area_struct *vma);
 663 extern struct perf_guest_info_callbacks *perf_guest_cbs;
 664 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 665 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
 666
 667 extern void perf_event_comm(struct task_struct *tsk);
 668 extern void perf_event_fork(struct task_struct *tsk);
 669
 670 /* Callchains */
 671 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
 672
 673 extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
 674 extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
 675
 676 static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
 677 {
 678         if (entry->nr < PERF_MAX_STACK_DEPTH)
 679                 entry->ip[entry->nr++] = ip;
 680 }
 681
 682 extern int sysctl_perf_event_paranoid;
 683 extern int sysctl_perf_event_mlock;
 684 extern int sysctl_perf_event_sample_rate;
 685 extern int sysctl_perf_cpu_time_max_percent;
 686
 687 extern void perf_sample_event_took(u64 sample_len_ns);
 688
 689 extern int perf_proc_update_handler(struct ctl_table *table, int write,
 690                 void __user *buffer, size_t *lenp,
 691                 loff_t *ppos);
 692 extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
 693                 void __user *buffer, size_t *lenp,
 694                 loff_t *ppos);
 695
 696
 697 static inline bool perf_paranoid_tracepoint_raw(void)
 698 {
 699         return sysctl_perf_event_paranoid > -1;
 700 }
 701
 702 static inline bool perf_paranoid_cpu(void)
 703 {
 704         return sysctl_perf_event_paranoid > 0;
 705 }
 706
 707 static inline bool perf_paranoid_kernel(void)
 708 {
 709         return sysctl_perf_event_paranoid > 1;
 710 }
 711
 712 extern void perf_event_init(void);
 713 extern void perf_tp_event(u64 addr, u64 count, void *record,
 714                           int entry_size, struct pt_regs *regs,
 715                           struct hlist_head *head, int rctx,
 716                           struct task_struct *task);
 717 extern void perf_bp_event(struct perf_event *event, void *data);
 718
 719 #ifndef perf_misc_flags
 720 # define perf_misc_flags(regs) \
 721                 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
 722 # define perf_instruction_pointer(regs) instruction_pointer(regs)
 723 #endif
 724
 725 static inline bool has_branch_stack(struct perf_event *event)
 726 {
 727         return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
 728 }
 729
 730 extern int perf_output_begin(struct perf_output_handle *handle,
 731                              struct perf_event *event, unsigned int size);
 732 extern void perf_output_end(struct perf_output_handle *handle);
 733 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
 734                              const void *buf, unsigned int len);
 735 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
 736                                      unsigned int len);
 737 extern int perf_swevent_get_recursion_context(void);
 738 extern void perf_swevent_put_recursion_context(int rctx);
 739 extern u64 perf_swevent_set_period(struct perf_event *event);
 740 extern void perf_event_enable(struct perf_event *event);
 741 extern void perf_event_disable(struct perf_event *event);
 742 extern int __perf_event_disable(void *info);
 743 extern void perf_event_task_tick(void);
 744 #else
 745 static inline void
 746 perf_event_task_sched_in(struct task_struct *prev,
 747                          struct task_struct *task)                      { }
 748 static inline void
 749 perf_event_task_sched_out(struct task_struct *prev,
 750                           struct task_struct *next)                     { }
 751 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
 752 static inline void perf_event_exit_task(struct task_struct *child)      { }
 753 static inline void perf_event_free_task(struct task_struct *task)       { }
 754 static inline void perf_event_delayed_put(struct task_struct *task)     { }
 755 static inline void perf_event_print_debug(void)                         { }
 756 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
 757 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
 758 static inline int perf_event_refresh(struct perf_event *event, int refresh)
 759 {
 760         return -EINVAL;
 761 }
 762
 763 static inline void
 764 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)     { }
 765 static inline void
 766 perf_bp_event(struct perf_event *event, void *data)                     { }
 767
 768 static inline int perf_register_guest_info_callbacks
 769 (struct perf_guest_info_callbacks *callbacks)                           { return 0; }
 770 static inline int perf_unregister_guest_info_callbacks
 771 (struct perf_guest_info_callbacks *callbacks)                           { return 0; }
 772
 773 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
 774 static inline void perf_event_comm(struct task_struct *tsk)             { }
 775 static inline void perf_event_fork(struct task_struct *tsk)             { }
 776 static inline void perf_event_init(void)                                { }
 777 static inline int  perf_swevent_get_recursion_context(void)             { return -1; }
 778 static inline void perf_swevent_put_recursion_context(int rctx)         { }
 779 static inline u64 perf_swevent_set_period(struct perf_event *event)     { return 0; }
 780 static inline void perf_event_enable(struct perf_event *event)          { }
 781 static inline void perf_event_disable(struct perf_event *event)         { }
 782 static inline int __perf_event_disable(void *info)                      { return -1; }
 783 static inline void perf_event_task_tick(void)                           { }
 784 #endif
 785
 786 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
 787 extern bool perf_event_can_stop_tick(void);
 788 #else
 789 static inline bool perf_event_can_stop_tick(void)                       { return true; }
 790 #endif
 791
 792 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
 793 extern void perf_restore_debug_store(void);
 794 #else
 795 static inline void perf_restore_debug_store(void)                       { }
 796 #endif
 797
 798 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
 799
 800 /*
 801  * This has to have a higher priority than migration_notifier in sched/core.c.
 802  */
 803 #define perf_cpu_notifier(fn)                                           \
 804 do {                                                                    \
 805         static struct notifier_block fn##_nb =                          \
 806                 { .notifier_call = fn, .priority = CPU_PRI_PERF };      \
 807         unsigned long cpu = smp_processor_id();                         \
 808         unsigned long flags;                                            \
 809         fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,                     \
 810                 (void *)(unsigned long)cpu);                            \
 811         local_irq_save(flags);                                          \
 812         fn(&fn##_nb, (unsigned long)CPU_STARTING,                       \
 813                 (void *)(unsigned long)cpu);                            \
 814         local_irq_restore(flags);                                       \
 815         fn(&fn##_nb, (unsigned long)CPU_ONLINE,                         \
 816                 (void *)(unsigned long)cpu);                            \
 817         register_cpu_notifier(&fn##_nb);                                \
 818 } while (0)
 819
 820
 821 struct perf_pmu_events_attr {
 822         struct device_attribute attr;
 823         u64 id;
 824         const char *event_str;
 825 };
 826
 827 #define PMU_EVENT_ATTR(_name, _var, _id, _show)                         \
 828 static struct perf_pmu_events_attr _var = {                             \
 829         .attr = __ATTR(_name, 0444, _show, NULL),                       \
 830         .id   =  _id,                                                   \
 831 };
 832
 833 #define PMU_FORMAT_ATTR(_name, _format)                                 \
 834 static ssize_t                                                          \
 835 _name##_show(struct device *dev,                                        \
 836                                struct device_attribute *attr,           \
 837                                char *page)                              \
 838 {                                                                       \
 839         BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);                     \
 840         return sprintf(page, _format "\n");                             \
 841 }                                                                       \
 842                                                                         \
 843 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
 844
 845 #endif /* _LINUX_PERF_EVENT_H */