include/linux/perf

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This source file includes following definitions.
perf_cgroup_from_task
perf_sample_data_init
is_default_overflow_handler
event_has_any_exclude_flag
is_sampling_event
is_software_event
in_software_context
is_exclusive_pmu
perf_arch_fetch_caller_regs
perf_fetch_caller_regs
perf_sw_event
perf_sw_event_sched
perf_sw_migrate_enabled
perf_event_task_migrate
perf_event_task_sched_in
perf_event_task_sched_out
perf_callchain_store_context
perf_callchain_store
perf_paranoid_tracepoint_raw
perf_paranoid_cpu
perf_paranoid_kernel
has_branch_stack
needs_branch_stack
has_aux
is_write_backward
has_addr_filter
perf_event_addr_filters
perf_aux_output_begin
perf_aux_output_end
perf_aux_output_skip
perf_get_aux
perf_event_task_migrate
perf_event_task_sched_in
perf_event_task_sched_out
perf_event_init_task
perf_event_exit_task
perf_event_free_task
perf_event_delayed_put
perf_event_get
perf_get_event
perf_event_attrs
perf_event_read_local
perf_event_print_debug
perf_event_task_disable
perf_event_task_enable
perf_event_refresh
perf_sw_event
perf_sw_event_sched
perf_bp_event
perf_event_mmap
perf_event_ksymbol
perf_event_bpf_event
perf_event_exec
perf_event_comm
perf_event_namespaces
perf_event_fork
perf_event_init
perf_swevent_get_recursion_context
perf_swevent_put_recursion_context
perf_swevent_set_period
perf_event_enable
perf_event_disable
__perf_event_disable
perf_event_task_tick
perf_event_release_kernel
perf_restore_debug_store
perf_raw_frag_last
   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 #include <uapi/linux/bpf_perf_event.h>
  19 
  20 /*
  21  * Kernel-internal data types and definitions:
  22  */
  23 
  24 #ifdef CONFIG_PERF_EVENTS
  25 # include <asm/perf_event.h>
  26 # include <asm/local64.h>
  27 #endif
  28 
  29 struct perf_guest_info_callbacks {
  30         int                             (*is_in_guest)(void);
  31         int                             (*is_user_mode)(void);
  32         unsigned long                   (*get_guest_ip)(void);
  33         void                            (*handle_intel_pt_intr)(void);
  34 };
  35 
  36 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  37 #include <asm/hw_breakpoint.h>
  38 #endif
  39 
  40 #include <linux/list.h>
  41 #include <linux/mutex.h>
  42 #include <linux/rculist.h>
  43 #include <linux/rcupdate.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/hrtimer.h>
  46 #include <linux/fs.h>
  47 #include <linux/pid_namespace.h>
  48 #include <linux/workqueue.h>
  49 #include <linux/ftrace.h>
  50 #include <linux/cpu.h>
  51 #include <linux/irq_work.h>
  52 #include <linux/static_key.h>
  53 #include <linux/jump_label_ratelimit.h>
  54 #include <linux/atomic.h>
  55 #include <linux/sysfs.h>
  56 #include <linux/perf_regs.h>
  57 #include <linux/cgroup.h>
  58 #include <linux/refcount.h>
  59 #include <asm/local.h>
  60 
  61 struct perf_callchain_entry {
  62         __u64                           nr;
  63         __u64                           ip[0]; /* /proc/sys/kernel/perf_event_max_stack */
  64 };
  65 
  66 struct perf_callchain_entry_ctx {
  67         struct perf_callchain_entry *entry;
  68         u32                         max_stack;
  69         u32                         nr;
  70         short                       contexts;
  71         bool                        contexts_maxed;
  72 };
  73 
  74 typedef unsigned long (*perf_copy_f)(void *dst, const void *src,
  75                                      unsigned long off, unsigned long len);
  76 
  77 struct perf_raw_frag {
  78         union {
  79                 struct perf_raw_frag    *next;
  80                 unsigned long           pad;
  81         };
  82         perf_copy_f                     copy;
  83         void                            *data;
  84         u32                             size;
  85 } __packed;
  86 
  87 struct perf_raw_record {
  88         struct perf_raw_frag            frag;
  89         u32                             size;
  90 };
  91 
  92 /*
  93  * branch stack layout:
  94  *  nr: number of taken branches stored in entries[]
  95  *
  96  * Note that nr can vary from sample to sample
  97  * branches (to, from) are stored from most recent
  98  * to least recent, i.e., entries[0] contains the most
  99  * recent branch.
 100  */
 101 struct perf_branch_stack {
 102         __u64                           nr;
 103         struct perf_branch_entry        entries[0];
 104 };
 105 
 106 struct task_struct;
 107 
 108 /*
 109  * extra PMU register associated with an event
 110  */
 111 struct hw_perf_event_extra {
 112         u64             config; /* register value */
 113         unsigned int    reg;    /* register address or index */
 114         int             alloc;  /* extra register already allocated */
 115         int             idx;    /* index in shared_regs->regs[] */
 116 };
 117 
 118 /**
 119  * struct hw_perf_event - performance event hardware details:
 120  */
 121 struct hw_perf_event {
 122 #ifdef CONFIG_PERF_EVENTS
 123         union {
 124                 struct { /* hardware */
 125                         u64             config;
 126                         u64             last_tag;
 127                         unsigned long   config_base;
 128                         unsigned long   event_base;
 129                         int             event_base_rdpmc;
 130                         int             idx;
 131                         int             last_cpu;
 132                         int             flags;
 133 
 134                         struct hw_perf_event_extra extra_reg;
 135                         struct hw_perf_event_extra branch_reg;
 136                 };
 137                 struct { /* software */
 138                         struct hrtimer  hrtimer;
 139                 };
 140                 struct { /* tracepoint */
 141                         /* for tp_event->class */
 142                         struct list_head        tp_list;
 143                 };
 144                 struct { /* amd_power */
 145                         u64     pwr_acc;
 146                         u64     ptsc;
 147                 };
 148 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 149                 struct { /* breakpoint */
 150                         /*
 151                          * Crufty hack to avoid the chicken and egg
 152                          * problem hw_breakpoint has with context
 153                          * creation and event initalization.
 154                          */
 155                         struct arch_hw_breakpoint       info;
 156                         struct list_head                bp_list;
 157                 };
 158 #endif
 159                 struct { /* amd_iommu */
 160                         u8      iommu_bank;
 161                         u8      iommu_cntr;
 162                         u16     padding;
 163                         u64     conf;
 164                         u64     conf1;
 165                 };
 166         };
 167         /*
 168          * If the event is a per task event, this will point to the task in
 169          * question. See the comment in perf_event_alloc().
 170          */
 171         struct task_struct              *target;
 172 
 173         /*
 174          * PMU would store hardware filter configuration
 175          * here.
 176          */
 177         void                            *addr_filters;
 178 
 179         /* Last sync'ed generation of filters */
 180         unsigned long                   addr_filters_gen;
 181 
 182 /*
 183  * hw_perf_event::state flags; used to track the PERF_EF_* state.
 184  */
 185 #define PERF_HES_STOPPED        0x01 /* the counter is stopped */
 186 #define PERF_HES_UPTODATE       0x02 /* event->count up-to-date */
 187 #define PERF_HES_ARCH           0x04
 188 
 189         int                             state;
 190 
 191         /*
 192          * The last observed hardware counter value, updated with a
 193          * local64_cmpxchg() such that pmu::read() can be called nested.
 194          */
 195         local64_t                       prev_count;
 196 
 197         /*
 198          * The period to start the next sample with.
 199          */
 200         u64                             sample_period;
 201 
 202         /*
 203          * The period we started this sample with.
 204          */
 205         u64                             last_period;
 206 
 207         /*
 208          * However much is left of the current period; note that this is
 209          * a full 64bit value and allows for generation of periods longer
 210          * than hardware might allow.
 211          */
 212         local64_t                       period_left;
 213 
 214         /*
 215          * State for throttling the event, see __perf_event_overflow() and
 216          * perf_adjust_freq_unthr_context().
 217          */
 218         u64                             interrupts_seq;
 219         u64                             interrupts;
 220 
 221         /*
 222          * State for freq target events, see __perf_event_overflow() and
 223          * perf_adjust_freq_unthr_context().
 224          */
 225         u64                             freq_time_stamp;
 226         u64                             freq_count_stamp;
 227 #endif
 228 };
 229 
 230 struct perf_event;
 231 
 232 /*
 233  * Common implementation detail of pmu::{start,commit,cancel}_txn
 234  */
 235 #define PERF_PMU_TXN_ADD  0x1           /* txn to add/schedule event on PMU */
 236 #define PERF_PMU_TXN_READ 0x2           /* txn to read event group from PMU */
 237 
 238 /**
 239  * pmu::capabilities flags
 240  */
 241 #define PERF_PMU_CAP_NO_INTERRUPT               0x01
 242 #define PERF_PMU_CAP_NO_NMI                     0x02
 243 #define PERF_PMU_CAP_AUX_NO_SG                  0x04
 244 #define PERF_PMU_CAP_EXTENDED_REGS              0x08
 245 #define PERF_PMU_CAP_EXCLUSIVE                  0x10
 246 #define PERF_PMU_CAP_ITRACE                     0x20
 247 #define PERF_PMU_CAP_HETEROGENEOUS_CPUS         0x40
 248 #define PERF_PMU_CAP_NO_EXCLUDE                 0x80
 249 #define PERF_PMU_CAP_AUX_OUTPUT                 0x100
 250 
 251 /**
 252  * struct pmu - generic performance monitoring unit
 253  */
 254 struct pmu {
 255         struct list_head                entry;
 256 
 257         struct module                   *module;
 258         struct device                   *dev;
 259         const struct attribute_group    **attr_groups;
 260         const struct attribute_group    **attr_update;
 261         const char                      *name;
 262         int                             type;
 263 
 264         /*
 265          * various common per-pmu feature flags
 266          */
 267         int                             capabilities;
 268 
 269         int __percpu                    *pmu_disable_count;
 270         struct perf_cpu_context __percpu *pmu_cpu_context;
 271         atomic_t                        exclusive_cnt; /* < 0: cpu; > 0: tsk */
 272         int                             task_ctx_nr;
 273         int                             hrtimer_interval_ms;
 274 
 275         /* number of address filters this PMU can do */
 276         unsigned int                    nr_addr_filters;
 277 
 278         /*
 279          * Fully disable/enable this PMU, can be used to protect from the PMI
 280          * as well as for lazy/batch writing of the MSRs.
 281          */
 282         void (*pmu_enable)              (struct pmu *pmu); /* optional */
 283         void (*pmu_disable)             (struct pmu *pmu); /* optional */
 284 
 285         /*
 286          * Try and initialize the event for this PMU.
 287          *
 288          * Returns:
 289          *  -ENOENT     -- @event is not for this PMU
 290          *
 291          *  -ENODEV     -- @event is for this PMU but PMU not present
 292          *  -EBUSY      -- @event is for this PMU but PMU temporarily unavailable
 293          *  -EINVAL     -- @event is for this PMU but @event is not valid
 294          *  -EOPNOTSUPP -- @event is for this PMU, @event is valid, but not supported
 295          *  -EACCES     -- @event is for this PMU, @event is valid, but no privileges
 296          *
 297          *  0           -- @event is for this PMU and valid
 298          *
 299          * Other error return values are allowed.
 300          */
 301         int (*event_init)               (struct perf_event *event);
 302 
 303         /*
 304          * Notification that the event was mapped or unmapped.  Called
 305          * in the context of the mapping task.
 306          */
 307         void (*event_mapped)            (struct perf_event *event, struct mm_struct *mm); /* optional */
 308         void (*event_unmapped)          (struct perf_event *event, struct mm_struct *mm); /* optional */
 309 
 310         /*
 311          * Flags for ->add()/->del()/ ->start()/->stop(). There are
 312          * matching hw_perf_event::state flags.
 313          */
 314 #define PERF_EF_START   0x01            /* start the counter when adding    */
 315 #define PERF_EF_RELOAD  0x02            /* reload the counter when starting */
 316 #define PERF_EF_UPDATE  0x04            /* update the counter when stopping */
 317 
 318         /*
 319          * Adds/Removes a counter to/from the PMU, can be done inside a
 320          * transaction, see the ->*_txn() methods.
 321          *
 322          * The add/del callbacks will reserve all hardware resources required
 323          * to service the event, this includes any counter constraint
 324          * scheduling etc.
 325          *
 326          * Called with IRQs disabled and the PMU disabled on the CPU the event
 327          * is on.
 328          *
 329          * ->add() called without PERF_EF_START should result in the same state
 330          *  as ->add() followed by ->stop().
 331          *
 332          * ->del() must always PERF_EF_UPDATE stop an event. If it calls
 333          *  ->stop() that must deal with already being stopped without
 334          *  PERF_EF_UPDATE.
 335          */
 336         int  (*add)                     (struct perf_event *event, int flags);
 337         void (*del)                     (struct perf_event *event, int flags);
 338 
 339         /*
 340          * Starts/Stops a counter present on the PMU.
 341          *
 342          * The PMI handler should stop the counter when perf_event_overflow()
 343          * returns !0. ->start() will be used to continue.
 344          *
 345          * Also used to change the sample period.
 346          *
 347          * Called with IRQs disabled and the PMU disabled on the CPU the event
 348          * is on -- will be called from NMI context with the PMU generates
 349          * NMIs.
 350          *
 351          * ->stop() with PERF_EF_UPDATE will read the counter and update
 352          *  period/count values like ->read() would.
 353          *
 354          * ->start() with PERF_EF_RELOAD will reprogram the the counter
 355          *  value, must be preceded by a ->stop() with PERF_EF_UPDATE.
 356          */
 357         void (*start)                   (struct perf_event *event, int flags);
 358         void (*stop)                    (struct perf_event *event, int flags);
 359 
 360         /*
 361          * Updates the counter value of the event.
 362          *
 363          * For sampling capable PMUs this will also update the software period
 364          * hw_perf_event::period_left field.
 365          */
 366         void (*read)                    (struct perf_event *event);
 367 
 368         /*
 369          * Group events scheduling is treated as a transaction, add
 370          * group events as a whole and perform one schedulability test.
 371          * If the test fails, roll back the whole group
 372          *
 373          * Start the transaction, after this ->add() doesn't need to
 374          * do schedulability tests.
 375          *
 376          * Optional.
 377          */
 378         void (*start_txn)               (struct pmu *pmu, unsigned int txn_flags);
 379         /*
 380          * If ->start_txn() disabled the ->add() schedulability test
 381          * then ->commit_txn() is required to perform one. On success
 382          * the transaction is closed. On error the transaction is kept
 383          * open until ->cancel_txn() is called.
 384          *
 385          * Optional.
 386          */
 387         int  (*commit_txn)              (struct pmu *pmu);
 388         /*
 389          * Will cancel the transaction, assumes ->del() is called
 390          * for each successful ->add() during the transaction.
 391          *
 392          * Optional.
 393          */
 394         void (*cancel_txn)              (struct pmu *pmu);
 395 
 396         /*
 397          * Will return the value for perf_event_mmap_page::index for this event,
 398          * if no implementation is provided it will default to: event->hw.idx + 1.
 399          */
 400         int (*event_idx)                (struct perf_event *event); /*optional */
 401 
 402         /*
 403          * context-switches callback
 404          */
 405         void (*sched_task)              (struct perf_event_context *ctx,
 406                                         bool sched_in);
 407         /*
 408          * PMU specific data size
 409          */
 410         size_t                          task_ctx_size;
 411 
 412 
 413         /*
 414          * Set up pmu-private data structures for an AUX area
 415          */
 416         void *(*setup_aux)              (struct perf_event *event, void **pages,
 417                                          int nr_pages, bool overwrite);
 418                                         /* optional */
 419 
 420         /*
 421          * Free pmu-private AUX data structures
 422          */
 423         void (*free_aux)                (void *aux); /* optional */
 424 
 425         /*
 426          * Validate address range filters: make sure the HW supports the
 427          * requested configuration and number of filters; return 0 if the
 428          * supplied filters are valid, -errno otherwise.
 429          *
 430          * Runs in the context of the ioctl()ing process and is not serialized
 431          * with the rest of the PMU callbacks.
 432          */
 433         int (*addr_filters_validate)    (struct list_head *filters);
 434                                         /* optional */
 435 
 436         /*
 437          * Synchronize address range filter configuration:
 438          * translate hw-agnostic filters into hardware configuration in
 439          * event::hw::addr_filters.
 440          *
 441          * Runs as a part of filter sync sequence that is done in ->start()
 442          * callback by calling perf_event_addr_filters_sync().
 443          *
 444          * May (and should) traverse event::addr_filters::list, for which its
 445          * caller provides necessary serialization.
 446          */
 447         void (*addr_filters_sync)       (struct perf_event *event);
 448                                         /* optional */
 449 
 450         /*
 451          * Check if event can be used for aux_output purposes for
 452          * events of this PMU.
 453          *
 454          * Runs from perf_event_open(). Should return 0 for "no match"
 455          * or non-zero for "match".
 456          */
 457         int (*aux_output_match)         (struct perf_event *event);
 458                                         /* optional */
 459 
 460         /*
 461          * Filter events for PMU-specific reasons.
 462          */
 463         int (*filter_match)             (struct perf_event *event); /* optional */
 464 
 465         /*
 466          * Check period value for PERF_EVENT_IOC_PERIOD ioctl.
 467          */
 468         int (*check_period)             (struct perf_event *event, u64 value); /* optional */
 469 };
 470 
 471 enum perf_addr_filter_action_t {
 472         PERF_ADDR_FILTER_ACTION_STOP = 0,
 473         PERF_ADDR_FILTER_ACTION_START,
 474         PERF_ADDR_FILTER_ACTION_FILTER,
 475 };
 476 
 477 /**
 478  * struct perf_addr_filter - address range filter definition
 479  * @entry:      event's filter list linkage
 480  * @path:       object file's path for file-based filters
 481  * @offset:     filter range offset
 482  * @size:       filter range size (size==0 means single address trigger)
 483  * @action:     filter/start/stop
 484  *
 485  * This is a hardware-agnostic filter configuration as specified by the user.
 486  */
 487 struct perf_addr_filter {
 488         struct list_head        entry;
 489         struct path             path;
 490         unsigned long           offset;
 491         unsigned long           size;
 492         enum perf_addr_filter_action_t  action;
 493 };
 494 
 495 /**
 496  * struct perf_addr_filters_head - container for address range filters
 497  * @list:       list of filters for this event
 498  * @lock:       spinlock that serializes accesses to the @list and event's
 499  *              (and its children's) filter generations.
 500  * @nr_file_filters:    number of file-based filters
 501  *
 502  * A child event will use parent's @list (and therefore @lock), so they are
 503  * bundled together; see perf_event_addr_filters().
 504  */
 505 struct perf_addr_filters_head {
 506         struct list_head        list;
 507         raw_spinlock_t          lock;
 508         unsigned int            nr_file_filters;
 509 };
 510 
 511 struct perf_addr_filter_range {
 512         unsigned long           start;
 513         unsigned long           size;
 514 };
 515 
 516 /**
 517  * enum perf_event_state - the states of an event:
 518  */
 519 enum perf_event_state {
 520         PERF_EVENT_STATE_DEAD           = -4,
 521         PERF_EVENT_STATE_EXIT           = -3,
 522         PERF_EVENT_STATE_ERROR          = -2,
 523         PERF_EVENT_STATE_OFF            = -1,
 524         PERF_EVENT_STATE_INACTIVE       =  0,
 525         PERF_EVENT_STATE_ACTIVE         =  1,
 526 };
 527 
 528 struct file;
 529 struct perf_sample_data;
 530 
 531 typedef void (*perf_overflow_handler_t)(struct perf_event *,
 532                                         struct perf_sample_data *,
 533                                         struct pt_regs *regs);
 534 
 535 /*
 536  * Event capabilities. For event_caps and groups caps.
 537  *
 538  * PERF_EV_CAP_SOFTWARE: Is a software event.
 539  * PERF_EV_CAP_READ_ACTIVE_PKG: A CPU event (or cgroup event) that can be read
 540  * from any CPU in the package where it is active.
 541  */
 542 #define PERF_EV_CAP_SOFTWARE            BIT(0)
 543 #define PERF_EV_CAP_READ_ACTIVE_PKG     BIT(1)
 544 
 545 #define SWEVENT_HLIST_BITS              8
 546 #define SWEVENT_HLIST_SIZE              (1 << SWEVENT_HLIST_BITS)
 547 
 548 struct swevent_hlist {
 549         struct hlist_head               heads[SWEVENT_HLIST_SIZE];
 550         struct rcu_head                 rcu_head;
 551 };
 552 
 553 #define PERF_ATTACH_CONTEXT     0x01
 554 #define PERF_ATTACH_GROUP       0x02
 555 #define PERF_ATTACH_TASK        0x04
 556 #define PERF_ATTACH_TASK_DATA   0x08
 557 #define PERF_ATTACH_ITRACE      0x10
 558 
 559 struct perf_cgroup;
 560 struct ring_buffer;
 561 
 562 struct pmu_event_list {
 563         raw_spinlock_t          lock;
 564         struct list_head        list;
 565 };
 566 
 567 #define for_each_sibling_event(sibling, event)                  \
 568         if ((event)->group_leader == (event))                   \
 569                 list_for_each_entry((sibling), &(event)->sibling_list, sibling_list)
 570 
 571 /**
 572  * struct perf_event - performance event kernel representation:
 573  */
 574 struct perf_event {
 575 #ifdef CONFIG_PERF_EVENTS
 576         /*
 577          * entry onto perf_event_context::event_list;
 578          *   modifications require ctx->lock
 579          *   RCU safe iterations.
 580          */
 581         struct list_head                event_entry;
 582 
 583         /*
 584          * Locked for modification by both ctx->mutex and ctx->lock; holding
 585          * either sufficies for read.
 586          */
 587         struct list_head                sibling_list;
 588         struct list_head                active_list;
 589         /*
 590          * Node on the pinned or flexible tree located at the event context;
 591          */
 592         struct rb_node                  group_node;
 593         u64                             group_index;
 594         /*
 595          * We need storage to track the entries in perf_pmu_migrate_context; we
 596          * cannot use the event_entry because of RCU and we want to keep the
 597          * group in tact which avoids us using the other two entries.
 598          */
 599         struct list_head                migrate_entry;
 600 
 601         struct hlist_node               hlist_entry;
 602         struct list_head                active_entry;
 603         int                             nr_siblings;
 604 
 605         /* Not serialized. Only written during event initialization. */
 606         int                             event_caps;
 607         /* The cumulative AND of all event_caps for events in this group. */
 608         int                             group_caps;
 609 
 610         struct perf_event               *group_leader;
 611         struct pmu                      *pmu;
 612         void                            *pmu_private;
 613 
 614         enum perf_event_state           state;
 615         unsigned int                    attach_state;
 616         local64_t                       count;
 617         atomic64_t                      child_count;
 618 
 619         /*
 620          * These are the total time in nanoseconds that the event
 621          * has been enabled (i.e. eligible to run, and the task has
 622          * been scheduled in, if this is a per-task event)
 623          * and running (scheduled onto the CPU), respectively.
 624          */
 625         u64                             total_time_enabled;
 626         u64                             total_time_running;
 627         u64                             tstamp;
 628 
 629         /*
 630          * timestamp shadows the actual context timing but it can
 631          * be safely used in NMI interrupt context. It reflects the
 632          * context time as it was when the event was last scheduled in.
 633          *
 634          * ctx_time already accounts for ctx->timestamp. Therefore to
 635          * compute ctx_time for a sample, simply add perf_clock().
 636          */
 637         u64                             shadow_ctx_time;
 638 
 639         struct perf_event_attr          attr;
 640         u16                             header_size;
 641         u16                             id_header_size;
 642         u16                             read_size;
 643         struct hw_perf_event            hw;
 644 
 645         struct perf_event_context       *ctx;
 646         atomic_long_t                   refcount;
 647 
 648         /*
 649          * These accumulate total time (in nanoseconds) that children
 650          * events have been enabled and running, respectively.
 651          */
 652         atomic64_t                      child_total_time_enabled;
 653         atomic64_t                      child_total_time_running;
 654 
 655         /*
 656          * Protect attach/detach and child_list:
 657          */
 658         struct mutex                    child_mutex;
 659         struct list_head                child_list;
 660         struct perf_event               *parent;
 661 
 662         int                             oncpu;
 663         int                             cpu;
 664 
 665         struct list_head                owner_entry;
 666         struct task_struct              *owner;
 667 
 668         /* mmap bits */
 669         struct mutex                    mmap_mutex;
 670         atomic_t                        mmap_count;
 671 
 672         struct ring_buffer              *rb;
 673         struct list_head                rb_entry;
 674         unsigned long                   rcu_batches;
 675         int                             rcu_pending;
 676 
 677         /* poll related */
 678         wait_queue_head_t               waitq;
 679         struct fasync_struct            *fasync;
 680 
 681         /* delayed work for NMIs and such */
 682         int                             pending_wakeup;
 683         int                             pending_kill;
 684         int                             pending_disable;
 685         struct irq_work                 pending;
 686 
 687         atomic_t                        event_limit;
 688 
 689         /* address range filters */
 690         struct perf_addr_filters_head   addr_filters;
 691         /* vma address array for file-based filders */
 692         struct perf_addr_filter_range   *addr_filter_ranges;
 693         unsigned long                   addr_filters_gen;
 694 
 695         /* for aux_output events */
 696         struct perf_event               *aux_event;
 697 
 698         void (*destroy)(struct perf_event *);
 699         struct rcu_head                 rcu_head;
 700 
 701         struct pid_namespace            *ns;
 702         u64                             id;
 703 
 704         u64                             (*clock)(void);
 705         perf_overflow_handler_t         overflow_handler;
 706         void                            *overflow_handler_context;
 707 #ifdef CONFIG_BPF_SYSCALL
 708         perf_overflow_handler_t         orig_overflow_handler;
 709         struct bpf_prog                 *prog;
 710 #endif
 711 
 712 #ifdef CONFIG_EVENT_TRACING
 713         struct trace_event_call         *tp_event;
 714         struct event_filter             *filter;
 715 #ifdef CONFIG_FUNCTION_TRACER
 716         struct ftrace_ops               ftrace_ops;
 717 #endif
 718 #endif
 719 
 720 #ifdef CONFIG_CGROUP_PERF
 721         struct perf_cgroup              *cgrp; /* cgroup event is attach to */
 722 #endif
 723 
 724         struct list_head                sb_list;
 725 #endif /* CONFIG_PERF_EVENTS */
 726 };
 727 
 728 
 729 struct perf_event_groups {
 730         struct rb_root  tree;
 731         u64             index;
 732 };
 733 
 734 /**
 735  * struct perf_event_context - event context structure
 736  *
 737  * Used as a container for task events and CPU events as well:
 738  */
 739 struct perf_event_context {
 740         struct pmu                      *pmu;
 741         /*
 742          * Protect the states of the events in the list,
 743          * nr_active, and the list:
 744          */
 745         raw_spinlock_t                  lock;
 746         /*
 747          * Protect the list of events.  Locking either mutex or lock
 748          * is sufficient to ensure the list doesn't change; to change
 749          * the list you need to lock both the mutex and the spinlock.
 750          */
 751         struct mutex                    mutex;
 752 
 753         struct list_head                active_ctx_list;
 754         struct perf_event_groups        pinned_groups;
 755         struct perf_event_groups        flexible_groups;
 756         struct list_head                event_list;
 757 
 758         struct list_head                pinned_active;
 759         struct list_head                flexible_active;
 760 
 761         int                             nr_events;
 762         int                             nr_active;
 763         int                             is_active;
 764         int                             nr_stat;
 765         int                             nr_freq;
 766         int                             rotate_disable;
 767         /*
 768          * Set when nr_events != nr_active, except tolerant to events not
 769          * necessary to be active due to scheduling constraints, such as cgroups.
 770          */
 771         int                             rotate_necessary;
 772         refcount_t                      refcount;
 773         struct task_struct              *task;
 774 
 775         /*
 776          * Context clock, runs when context enabled.
 777          */
 778         u64                             time;
 779         u64                             timestamp;
 780 
 781         /*
 782          * These fields let us detect when two contexts have both
 783          * been cloned (inherited) from a common ancestor.
 784          */
 785         struct perf_event_context       *parent_ctx;
 786         u64                             parent_gen;
 787         u64                             generation;
 788         int                             pin_count;
 789 #ifdef CONFIG_CGROUP_PERF
 790         int                             nr_cgroups;      /* cgroup evts */
 791 #endif
 792         void                            *task_ctx_data; /* pmu specific data */
 793         struct rcu_head                 rcu_head;
 794 };
 795 
 796 /*
 797  * Number of contexts where an event can trigger:
 798  *      task, softirq, hardirq, nmi.
 799  */
 800 #define PERF_NR_CONTEXTS        4
 801 
 802 /**
 803  * struct perf_event_cpu_context - per cpu event context structure
 804  */
 805 struct perf_cpu_context {
 806         struct perf_event_context       ctx;
 807         struct perf_event_context       *task_ctx;
 808         int                             active_oncpu;
 809         int                             exclusive;
 810 
 811         raw_spinlock_t                  hrtimer_lock;
 812         struct hrtimer                  hrtimer;
 813         ktime_t                         hrtimer_interval;
 814         unsigned int                    hrtimer_active;
 815 
 816 #ifdef CONFIG_CGROUP_PERF
 817         struct perf_cgroup              *cgrp;
 818         struct list_head                cgrp_cpuctx_entry;
 819 #endif
 820 
 821         struct list_head                sched_cb_entry;
 822         int                             sched_cb_usage;
 823 
 824         int                             online;
 825 };
 826 
 827 struct perf_output_handle {
 828         struct perf_event               *event;
 829         struct ring_buffer              *rb;
 830         unsigned long                   wakeup;
 831         unsigned long                   size;
 832         u64                             aux_flags;
 833         union {
 834                 void                    *addr;
 835                 unsigned long           head;
 836         };
 837         int                             page;
 838 };
 839 
 840 struct bpf_perf_event_data_kern {
 841         bpf_user_pt_regs_t *regs;
 842         struct perf_sample_data *data;
 843         struct perf_event *event;
 844 };
 845 
 846 #ifdef CONFIG_CGROUP_PERF
 847 
 848 /*
 849  * perf_cgroup_info keeps track of time_enabled for a cgroup.
 850  * This is a per-cpu dynamically allocated data structure.
 851  */
 852 struct perf_cgroup_info {
 853         u64                             time;
 854         u64                             timestamp;
 855 };
 856 
 857 struct perf_cgroup {
 858         struct cgroup_subsys_state      css;
 859         struct perf_cgroup_info __percpu *info;
 860 };
 861 
 862 /*
 863  * Must ensure cgroup is pinned (css_get) before calling
 864  * this function. In other words, we cannot call this function
 865  * if there is no cgroup event for the current CPU context.
 866  */
 867 static inline struct perf_cgroup *
 868 perf_cgroup_from_task(struct task_struct *task, struct perf_event_context *ctx)
 869 {
 870         return container_of(task_css_check(task, perf_event_cgrp_id,
 871                                            ctx ? lockdep_is_held(&ctx->lock)
 872                                                : true),
 873                             struct perf_cgroup, css);
 874 }
 875 #endif /* CONFIG_CGROUP_PERF */
 876 
 877 #ifdef CONFIG_PERF_EVENTS
 878 
 879 extern void *perf_aux_output_begin(struct perf_output_handle *handle,
 880                                    struct perf_event *event);
 881 extern void perf_aux_output_end(struct perf_output_handle *handle,
 882                                 unsigned long size);
 883 extern int perf_aux_output_skip(struct perf_output_handle *handle,
 884                                 unsigned long size);
 885 extern void *perf_get_aux(struct perf_output_handle *handle);
 886 extern void perf_aux_output_flag(struct perf_output_handle *handle, u64 flags);
 887 extern void perf_event_itrace_started(struct perf_event *event);
 888 
 889 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
 890 extern void perf_pmu_unregister(struct pmu *pmu);
 891 
 892 extern int perf_num_counters(void);
 893 extern const char *perf_pmu_name(void);
 894 extern void __perf_event_task_sched_in(struct task_struct *prev,
 895                                        struct task_struct *task);
 896 extern void __perf_event_task_sched_out(struct task_struct *prev,
 897                                         struct task_struct *next);
 898 extern int perf_event_init_task(struct task_struct *child);
 899 extern void perf_event_exit_task(struct task_struct *child);
 900 extern void perf_event_free_task(struct task_struct *task);
 901 extern void perf_event_delayed_put(struct task_struct *task);
 902 extern struct file *perf_event_get(unsigned int fd);
 903 extern const struct perf_event *perf_get_event(struct file *file);
 904 extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event);
 905 extern void perf_event_print_debug(void);
 906 extern void perf_pmu_disable(struct pmu *pmu);
 907 extern void perf_pmu_enable(struct pmu *pmu);
 908 extern void perf_sched_cb_dec(struct pmu *pmu);
 909 extern void perf_sched_cb_inc(struct pmu *pmu);
 910 extern int perf_event_task_disable(void);
 911 extern int perf_event_task_enable(void);
 912 
 913 extern void perf_pmu_resched(struct pmu *pmu);
 914 
 915 extern int perf_event_refresh(struct perf_event *event, int refresh);
 916 extern void perf_event_update_userpage(struct perf_event *event);
 917 extern int perf_event_release_kernel(struct perf_event *event);
 918 extern struct perf_event *
 919 perf_event_create_kernel_counter(struct perf_event_attr *attr,
 920                                 int cpu,
 921                                 struct task_struct *task,
 922                                 perf_overflow_handler_t callback,
 923                                 void *context);
 924 extern void perf_pmu_migrate_context(struct pmu *pmu,
 925                                 int src_cpu, int dst_cpu);
 926 int perf_event_read_local(struct perf_event *event, u64 *value,
 927                           u64 *enabled, u64 *running);
 928 extern u64 perf_event_read_value(struct perf_event *event,
 929                                  u64 *enabled, u64 *running);
 930 
 931 
 932 struct perf_sample_data {
 933         /*
 934          * Fields set by perf_sample_data_init(), group so as to
 935          * minimize the cachelines touched.
 936          */
 937         u64                             addr;
 938         struct perf_raw_record          *raw;
 939         struct perf_branch_stack        *br_stack;
 940         u64                             period;
 941         u64                             weight;
 942         u64                             txn;
 943         union  perf_mem_data_src        data_src;
 944 
 945         /*
 946          * The other fields, optionally {set,used} by
 947          * perf_{prepare,output}_sample().
 948          */
 949         u64                             type;
 950         u64                             ip;
 951         struct {
 952                 u32     pid;
 953                 u32     tid;
 954         }                               tid_entry;
 955         u64                             time;
 956         u64                             id;
 957         u64                             stream_id;
 958         struct {
 959                 u32     cpu;
 960                 u32     reserved;
 961         }                               cpu_entry;
 962         struct perf_callchain_entry     *callchain;
 963 
 964         /*
 965          * regs_user may point to task_pt_regs or to regs_user_copy, depending
 966          * on arch details.
 967          */
 968         struct perf_regs                regs_user;
 969         struct pt_regs                  regs_user_copy;
 970 
 971         struct perf_regs                regs_intr;
 972         u64                             stack_user_size;
 973 
 974         u64                             phys_addr;
 975 } ____cacheline_aligned;
 976 
 977 /* default value for data source */
 978 #define PERF_MEM_NA (PERF_MEM_S(OP, NA)   |\
 979                     PERF_MEM_S(LVL, NA)   |\
 980                     PERF_MEM_S(SNOOP, NA) |\
 981                     PERF_MEM_S(LOCK, NA)  |\
 982                     PERF_MEM_S(TLB, NA))
 983 
 984 static inline void perf_sample_data_init(struct perf_sample_data *data,
 985                                          u64 addr, u64 period)
 986 {
 987         /* remaining struct members initialized in perf_prepare_sample() */
 988         data->addr = addr;
 989         data->raw  = NULL;
 990         data->br_stack = NULL;
 991         data->period = period;
 992         data->weight = 0;
 993         data->data_src.val = PERF_MEM_NA;
 994         data->txn = 0;
 995 }
 996 
 997 extern void perf_output_sample(struct perf_output_handle *handle,
 998                                struct perf_event_header *header,
 999                                struct perf_sample_data *data,
1000                                struct perf_event *event);
1001 extern void perf_prepare_sample(struct perf_event_header *header,
1002                                 struct perf_sample_data *data,
1003                                 struct perf_event *event,
1004                                 struct pt_regs *regs);
1005 
1006 extern int perf_event_overflow(struct perf_event *event,
1007                                  struct perf_sample_data *data,
1008                                  struct pt_regs *regs);
1009 
1010 extern void perf_event_output_forward(struct perf_event *event,
1011                                      struct perf_sample_data *data,
1012                                      struct pt_regs *regs);
1013 extern void perf_event_output_backward(struct perf_event *event,
1014                                        struct perf_sample_data *data,
1015                                        struct pt_regs *regs);
1016 extern int perf_event_output(struct perf_event *event,
1017                              struct perf_sample_data *data,
1018                              struct pt_regs *regs);
1019 
1020 static inline bool
1021 is_default_overflow_handler(struct perf_event *event)
1022 {
1023         if (likely(event->overflow_handler == perf_event_output_forward))
1024                 return true;
1025         if (unlikely(event->overflow_handler == perf_event_output_backward))
1026                 return true;
1027         return false;
1028 }
1029 
1030 extern void
1031 perf_event_header__init_id(struct perf_event_header *header,
1032                            struct perf_sample_data *data,
1033                            struct perf_event *event);
1034 extern void
1035 perf_event__output_id_sample(struct perf_event *event,
1036                              struct perf_output_handle *handle,
1037                              struct perf_sample_data *sample);
1038 
1039 extern void
1040 perf_log_lost_samples(struct perf_event *event, u64 lost);
1041 
1042 static inline bool event_has_any_exclude_flag(struct perf_event *event)
1043 {
1044         struct perf_event_attr *attr = &event->attr;
1045 
1046         return attr->exclude_idle || attr->exclude_user ||
1047                attr->exclude_kernel || attr->exclude_hv ||
1048                attr->exclude_guest || attr->exclude_host;
1049 }
1050 
1051 static inline bool is_sampling_event(struct perf_event *event)
1052 {
1053         return event->attr.sample_period != 0;
1054 }
1055 
1056 /*
1057  * Return 1 for a software event, 0 for a hardware event
1058  */
1059 static inline int is_software_event(struct perf_event *event)
1060 {
1061         return event->event_caps & PERF_EV_CAP_SOFTWARE;
1062 }
1063 
1064 /*
1065  * Return 1 for event in sw context, 0 for event in hw context
1066  */
1067 static inline int in_software_context(struct perf_event *event)
1068 {
1069         return event->ctx->pmu->task_ctx_nr == perf_sw_context;
1070 }
1071 
1072 static inline int is_exclusive_pmu(struct pmu *pmu)
1073 {
1074         return pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE;
1075 }
1076 
1077 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
1078 
1079 extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64);
1080 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
1081 
1082 #ifndef perf_arch_fetch_caller_regs
1083 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
1084 #endif
1085 
1086 /*
1087  * When generating a perf sample in-line, instead of from an interrupt /
1088  * exception, we lack a pt_regs. This is typically used from software events
1089  * like: SW_CONTEXT_SWITCHES, SW_MIGRATIONS and the tie-in with tracepoints.
1090  *
1091  * We typically don't need a full set, but (for x86) do require:
1092  * - ip for PERF_SAMPLE_IP
1093  * - cs for user_mode() tests
1094  * - sp for PERF_SAMPLE_CALLCHAIN
1095  * - eflags for MISC bits and CALLCHAIN (see: perf_hw_regs())
1096  *
1097  * NOTE: assumes @regs is otherwise already 0 filled; this is important for
1098  * things like PERF_SAMPLE_REGS_INTR.
1099  */
1100 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
1101 {
1102         perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
1103 }
1104 
1105 static __always_inline void
1106 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
1107 {
1108         if (static_key_false(&perf_swevent_enabled[event_id]))
1109                 __perf_sw_event(event_id, nr, regs, addr);
1110 }
1111 
1112 DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]);
1113 
1114 /*
1115  * 'Special' version for the scheduler, it hard assumes no recursion,
1116  * which is guaranteed by us not actually scheduling inside other swevents
1117  * because those disable preemption.
1118  */
1119 static __always_inline void
1120 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)
1121 {
1122         if (static_key_false(&perf_swevent_enabled[event_id])) {
1123                 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
1124 
1125                 perf_fetch_caller_regs(regs);
1126                 ___perf_sw_event(event_id, nr, regs, addr);
1127         }
1128 }
1129 
1130 extern struct static_key_false perf_sched_events;
1131 
1132 static __always_inline bool
1133 perf_sw_migrate_enabled(void)
1134 {
1135         if (static_key_false(&perf_swevent_enabled[PERF_COUNT_SW_CPU_MIGRATIONS]))
1136                 return true;
1137         return false;
1138 }
1139 
1140 static inline void perf_event_task_migrate(struct task_struct *task)
1141 {
1142         if (perf_sw_migrate_enabled())
1143                 task->sched_migrated = 1;
1144 }
1145 
1146 static inline void perf_event_task_sched_in(struct task_struct *prev,
1147                                             struct task_struct *task)
1148 {
1149         if (static_branch_unlikely(&perf_sched_events))
1150                 __perf_event_task_sched_in(prev, task);
1151 
1152         if (perf_sw_migrate_enabled() && task->sched_migrated) {
1153                 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
1154 
1155                 perf_fetch_caller_regs(regs);
1156                 ___perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, regs, 0);
1157                 task->sched_migrated = 0;
1158         }
1159 }
1160 
1161 static inline void perf_event_task_sched_out(struct task_struct *prev,
1162                                              struct task_struct *next)
1163 {
1164         perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);
1165 
1166         if (static_branch_unlikely(&perf_sched_events))
1167                 __perf_event_task_sched_out(prev, next);
1168 }
1169 
1170 extern void perf_event_mmap(struct vm_area_struct *vma);
1171 
1172 extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
1173                                bool unregister, const char *sym);
1174 extern void perf_event_bpf_event(struct bpf_prog *prog,
1175                                  enum perf_bpf_event_type type,
1176                                  u16 flags);
1177 
1178 extern struct perf_guest_info_callbacks *perf_guest_cbs;
1179 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1180 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1181 
1182 extern void perf_event_exec(void);
1183 extern void perf_event_comm(struct task_struct *tsk, bool exec);
1184 extern void perf_event_namespaces(struct task_struct *tsk);
1185 extern void perf_event_fork(struct task_struct *tsk);
1186 
1187 /* Callchains */
1188 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
1189 
1190 extern void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs);
1191 extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs);
1192 extern struct perf_callchain_entry *
1193 get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
1194                    u32 max_stack, bool crosstask, bool add_mark);
1195 extern struct perf_callchain_entry *perf_callchain(struct perf_event *event, struct pt_regs *regs);
1196 extern int get_callchain_buffers(int max_stack);
1197 extern void put_callchain_buffers(void);
1198 
1199 extern int sysctl_perf_event_max_stack;
1200 extern int sysctl_perf_event_max_contexts_per_stack;
1201 
1202 static inline int perf_callchain_store_context(struct perf_callchain_entry_ctx *ctx, u64 ip)
1203 {
1204         if (ctx->contexts < sysctl_perf_event_max_contexts_per_stack) {
1205                 struct perf_callchain_entry *entry = ctx->entry;
1206                 entry->ip[entry->nr++] = ip;
1207                 ++ctx->contexts;
1208                 return 0;
1209         } else {
1210                 ctx->contexts_maxed = true;
1211                 return -1; /* no more room, stop walking the stack */
1212         }
1213 }
1214 
1215 static inline int perf_callchain_store(struct perf_callchain_entry_ctx *ctx, u64 ip)
1216 {
1217         if (ctx->nr < ctx->max_stack && !ctx->contexts_maxed) {
1218                 struct perf_callchain_entry *entry = ctx->entry;
1219                 entry->ip[entry->nr++] = ip;
1220                 ++ctx->nr;
1221                 return 0;
1222         } else {
1223                 return -1; /* no more room, stop walking the stack */
1224         }
1225 }
1226 
1227 extern int sysctl_perf_event_paranoid;
1228 extern int sysctl_perf_event_mlock;
1229 extern int sysctl_perf_event_sample_rate;
1230 extern int sysctl_perf_cpu_time_max_percent;
1231 
1232 extern void perf_sample_event_took(u64 sample_len_ns);
1233 
1234 extern int perf_proc_update_handler(struct ctl_table *table, int write,
1235                 void __user *buffer, size_t *lenp,
1236                 loff_t *ppos);
1237 extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
1238                 void __user *buffer, size_t *lenp,
1239                 loff_t *ppos);
1240 
1241 int perf_event_max_stack_handler(struct ctl_table *table, int write,
1242                                  void __user *buffer, size_t *lenp, loff_t *ppos);
1243 
1244 static inline bool perf_paranoid_tracepoint_raw(void)
1245 {
1246         return sysctl_perf_event_paranoid > -1;
1247 }
1248 
1249 static inline bool perf_paranoid_cpu(void)
1250 {
1251         return sysctl_perf_event_paranoid > 0;
1252 }
1253 
1254 static inline bool perf_paranoid_kernel(void)
1255 {
1256         return sysctl_perf_event_paranoid > 1;
1257 }
1258 
1259 extern void perf_event_init(void);
1260 extern void perf_tp_event(u16 event_type, u64 count, void *record,
1261                           int entry_size, struct pt_regs *regs,
1262                           struct hlist_head *head, int rctx,
1263                           struct task_struct *task);
1264 extern void perf_bp_event(struct perf_event *event, void *data);
1265 
1266 #ifndef perf_misc_flags
1267 # define perf_misc_flags(regs) \
1268                 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
1269 # define perf_instruction_pointer(regs) instruction_pointer(regs)
1270 #endif
1271 #ifndef perf_arch_bpf_user_pt_regs
1272 # define perf_arch_bpf_user_pt_regs(regs) regs
1273 #endif
1274 
1275 static inline bool has_branch_stack(struct perf_event *event)
1276 {
1277         return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
1278 }
1279 
1280 static inline bool needs_branch_stack(struct perf_event *event)
1281 {
1282         return event->attr.branch_sample_type != 0;
1283 }
1284 
1285 static inline bool has_aux(struct perf_event *event)
1286 {
1287         return event->pmu->setup_aux;
1288 }
1289 
1290 static inline bool is_write_backward(struct perf_event *event)
1291 {
1292         return !!event->attr.write_backward;
1293 }
1294 
1295 static inline bool has_addr_filter(struct perf_event *event)
1296 {
1297         return event->pmu->nr_addr_filters;
1298 }
1299 
1300 /*
1301  * An inherited event uses parent's filters
1302  */
1303 static inline struct perf_addr_filters_head *
1304 perf_event_addr_filters(struct perf_event *event)
1305 {
1306         struct perf_addr_filters_head *ifh = &event->addr_filters;
1307 
1308         if (event->parent)
1309                 ifh = &event->parent->addr_filters;
1310 
1311         return ifh;
1312 }
1313 
1314 extern void perf_event_addr_filters_sync(struct perf_event *event);
1315 
1316 extern int perf_output_begin(struct perf_output_handle *handle,
1317                              struct perf_event *event, unsigned int size);
1318 extern int perf_output_begin_forward(struct perf_output_handle *handle,
1319                                     struct perf_event *event,
1320                                     unsigned int size);
1321 extern int perf_output_begin_backward(struct perf_output_handle *handle,
1322                                       struct perf_event *event,
1323                                       unsigned int size);
1324 
1325 extern void perf_output_end(struct perf_output_handle *handle);
1326 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
1327                              const void *buf, unsigned int len);
1328 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
1329                                      unsigned int len);
1330 extern int perf_swevent_get_recursion_context(void);
1331 extern void perf_swevent_put_recursion_context(int rctx);
1332 extern u64 perf_swevent_set_period(struct perf_event *event);
1333 extern void perf_event_enable(struct perf_event *event);
1334 extern void perf_event_disable(struct perf_event *event);
1335 extern void perf_event_disable_local(struct perf_event *event);
1336 extern void perf_event_disable_inatomic(struct perf_event *event);
1337 extern void perf_event_task_tick(void);
1338 extern int perf_event_account_interrupt(struct perf_event *event);
1339 #else /* !CONFIG_PERF_EVENTS: */
1340 static inline void *
1341 perf_aux_output_begin(struct perf_output_handle *handle,
1342                       struct perf_event *event)                         { return NULL; }
1343 static inline void
1344 perf_aux_output_end(struct perf_output_handle *handle, unsigned long size)
1345                                                                         { }
1346 static inline int
1347 perf_aux_output_skip(struct perf_output_handle *handle,
1348                      unsigned long size)                                { return -EINVAL; }
1349 static inline void *
1350 perf_get_aux(struct perf_output_handle *handle)                         { return NULL; }
1351 static inline void
1352 perf_event_task_migrate(struct task_struct *task)                       { }
1353 static inline void
1354 perf_event_task_sched_in(struct task_struct *prev,
1355                          struct task_struct *task)                      { }
1356 static inline void
1357 perf_event_task_sched_out(struct task_struct *prev,
1358                           struct task_struct *next)                     { }
1359 static inline int perf_event_init_task(struct task_struct *child)       { return 0; }
1360 static inline void perf_event_exit_task(struct task_struct *child)      { }
1361 static inline void perf_event_free_task(struct task_struct *task)       { }
1362 static inline void perf_event_delayed_put(struct task_struct *task)     { }
1363 static inline struct file *perf_event_get(unsigned int fd)      { return ERR_PTR(-EINVAL); }
1364 static inline const struct perf_event *perf_get_event(struct file *file)
1365 {
1366         return ERR_PTR(-EINVAL);
1367 }
1368 static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event)
1369 {
1370         return ERR_PTR(-EINVAL);
1371 }
1372 static inline int perf_event_read_local(struct perf_event *event, u64 *value,
1373                                         u64 *enabled, u64 *running)
1374 {
1375         return -EINVAL;
1376 }
1377 static inline void perf_event_print_debug(void)                         { }
1378 static inline int perf_event_task_disable(void)                         { return -EINVAL; }
1379 static inline int perf_event_task_enable(void)                          { return -EINVAL; }
1380 static inline int perf_event_refresh(struct perf_event *event, int refresh)
1381 {
1382         return -EINVAL;
1383 }
1384 
1385 static inline void
1386 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)     { }
1387 static inline void
1388 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)                     { }
1389 static inline void
1390 perf_bp_event(struct perf_event *event, void *data)                     { }
1391 
1392 static inline int perf_register_guest_info_callbacks
1393 (struct perf_guest_info_callbacks *callbacks)                           { return 0; }
1394 static inline int perf_unregister_guest_info_callbacks
1395 (struct perf_guest_info_callbacks *callbacks)                           { return 0; }
1396 
1397 static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
1398 
1399 typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data);
1400 static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
1401                                       bool unregister, const char *sym) { }
1402 static inline void perf_event_bpf_event(struct bpf_prog *prog,
1403                                         enum perf_bpf_event_type type,
1404                                         u16 flags)                      { }
1405 static inline void perf_event_exec(void)                                { }
1406 static inline void perf_event_comm(struct task_struct *tsk, bool exec)  { }
1407 static inline void perf_event_namespaces(struct task_struct *tsk)       { }
1408 static inline void perf_event_fork(struct task_struct *tsk)             { }
1409 static inline void perf_event_init(void)                                { }
1410 static inline int  perf_swevent_get_recursion_context(void)             { return -1; }
1411 static inline void perf_swevent_put_recursion_context(int rctx)         { }
1412 static inline u64 perf_swevent_set_period(struct perf_event *event)     { return 0; }
1413 static inline void perf_event_enable(struct perf_event *event)          { }
1414 static inline void perf_event_disable(struct perf_event *event)         { }
1415 static inline int __perf_event_disable(void *info)                      { return -1; }
1416 static inline void perf_event_task_tick(void)                           { }
1417 static inline int perf_event_release_kernel(struct perf_event *event)   { return 0; }
1418 #endif
1419 
1420 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
1421 extern void perf_restore_debug_store(void);
1422 #else
1423 static inline void perf_restore_debug_store(void)                       { }
1424 #endif
1425 
1426 static __always_inline bool perf_raw_frag_last(const struct perf_raw_frag *frag)
1427 {
1428         return frag->pad < sizeof(u64);
1429 }
1430 
1431 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
1432 
1433 struct perf_pmu_events_attr {
1434         struct device_attribute attr;
1435         u64 id;
1436         const char *event_str;
1437 };
1438 
1439 struct perf_pmu_events_ht_attr {
1440         struct device_attribute                 attr;
1441         u64                                     id;
1442         const char                              *event_str_ht;
1443         const char                              *event_str_noht;
1444 };
1445 
1446 ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
1447                               char *page);
1448 
1449 #define PMU_EVENT_ATTR(_name, _var, _id, _show)                         \
1450 static struct perf_pmu_events_attr _var = {                             \
1451         .attr = __ATTR(_name, 0444, _show, NULL),                       \
1452         .id   =  _id,                                                   \
1453 };
1454 
1455 #define PMU_EVENT_ATTR_STRING(_name, _var, _str)                            \
1456 static struct perf_pmu_events_attr _var = {                                 \
1457         .attr           = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \
1458         .id             = 0,                                                \
1459         .event_str      = _str,                                             \
1460 };
1461 
1462 #define PMU_FORMAT_ATTR(_name, _format)                                 \
1463 static ssize_t                                                          \
1464 _name##_show(struct device *dev,                                        \
1465                                struct device_attribute *attr,           \
1466                                char *page)                              \
1467 {                                                                       \
1468         BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);                     \
1469         return sprintf(page, _format "\n");                             \
1470 }                                                                       \
1471                                                                         \
1472 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
1473 
1474 /* Performance counter hotplug functions */
1475 #ifdef CONFIG_PERF_EVENTS
1476 int perf_event_init_cpu(unsigned int cpu);
1477 int perf_event_exit_cpu(unsigned int cpu);
1478 #else
1479 #define perf_event_init_cpu     NULL
1480 #define perf_event_exit_cpu     NULL
1481 #endif
1482 
1483 #endif /* _LINUX_PERF_EVENT_H */
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root/include/linux/perf_event.h

INCLUDED FROM

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