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 /*
  * Performance events:
  *
  *    Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
  *    Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
  *    Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
  *
  * Data type definitions, declarations, prototypes.
  *
  *    Started by: Thomas Gleixner and Ingo Molnar
  *
  * For licencing details see kernel-base/COPYING
  */
 #ifndef _LINUX_PERF_EVENT_H
 #define _LINUX_PERF_EVENT_H
 
 #include <uapi/linux/perf_event.h>
 #include <uapi/linux/bpf_perf_event.h>
 
 /*
  * Kernel-internal data types and definitions:
  */
 
 #ifdef CONFIG_PERF_EVENTS
 # include <asm/perf_event.h>
 # include <asm/local64.h>
 #endif
 
 #define PERF_GUEST_ACTIVE   0x01
 #define PERF_GUEST_USER 0x02
 
 struct perf_guest_info_callbacks {
     unsigned int            (*state)(void);
     unsigned long           (*get_ip)(void);
     unsigned int            (*handle_intel_pt_intr)(void);
 };
 
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 #include <asm/hw_breakpoint.h>
 #endif
 
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
 #include <linux/spinlock.h>
 #include <linux/hrtimer.h>
 #include <linux/fs.h>
 #include <linux/pid_namespace.h>
 #include <linux/workqueue.h>
 #include <linux/ftrace.h>
 #include <linux/cpu.h>
 #include <linux/irq_work.h>
 #include <linux/static_key.h>
 #include <linux/jump_label_ratelimit.h>
 #include <linux/atomic.h>
 #include <linux/sysfs.h>
 #include <linux/perf_regs.h>
 #include <linux/cgroup.h>
 #include <linux/refcount.h>
 #include <linux/security.h>
 #include <linux/static_call.h>
 #include <asm/local.h>
 
 struct perf_callchain_entry {
     __u64               nr;
     __u64               ip[]; /* /proc/sys/kernel/perf_event_max_stack */
 };
 
 struct perf_callchain_entry_ctx {
     struct perf_callchain_entry *entry;
     u32             max_stack;
     u32             nr;
     short               contexts;
     bool                contexts_maxed;
 };
 
 typedef unsigned long (*perf_copy_f)(void *dst, const void *src,
                      unsigned long off, unsigned long len);
 
 struct perf_raw_frag {
     union {
         struct perf_raw_frag    *next;
         unsigned long       pad;
     };
     perf_copy_f         copy;
     void                *data;
     u32             size;
 } __packed;
 
 struct perf_raw_record {
     struct perf_raw_frag        frag;
     u32             size;
 };
 
 /*
  * branch stack layout:
  *  nr: number of taken branches stored in entries[]
  *  hw_idx: The low level index of raw branch records
  *          for the most recent branch.
  *          -1ULL means invalid/unknown.
  *
  * Note that nr can vary from sample to sample
  * branches (to, from) are stored from most recent
  * to least recent, i.e., entries[0] contains the most
  * recent branch.
  * The entries[] is an abstraction of raw branch records,
  * which may not be stored in age order in HW, e.g. Intel LBR.
  * The hw_idx is to expose the low level index of raw
  * branch record for the most recent branch aka entries[0].
  * The hw_idx index is between -1 (unknown) and max depth,
  * which can be retrieved in /sys/devices/cpu/caps/branches.
  * For the architectures whose raw branch records are
  * already stored in age order, the hw_idx should be 0.
  */
 struct perf_branch_stack {
     __u64               nr;
     __u64               hw_idx;
     struct perf_branch_entry    entries[];
 };
 
 struct task_struct;
 
 /*
  * extra PMU register associated with an event
  */
 struct hw_perf_event_extra {
     u64     config; /* register value */
     unsigned int    reg;    /* register address or index */
     int     alloc;  /* extra register already allocated */
     int     idx;    /* index in shared_regs->regs[] */
 };
 
 /**
  * hw_perf_event::flag values
  *
  * PERF_EVENT_FLAG_ARCH bits are reserved for architecture-specific
  * usage.
  */
 #define PERF_EVENT_FLAG_ARCH            0x0000ffff
 #define PERF_EVENT_FLAG_USER_READ_CNT       0x80000000
 
 /**
  * struct hw_perf_event - performance event hardware details:
  */
 struct hw_perf_event {
 #ifdef CONFIG_PERF_EVENTS
     union {
         struct { /* hardware */
             u64     config;
             u64     last_tag;
             unsigned long   config_base;
             unsigned long   event_base;
             int     event_base_rdpmc;
             int     idx;
             int     last_cpu;
             int     flags;
 
             struct hw_perf_event_extra extra_reg;
             struct hw_perf_event_extra branch_reg;
         };
         struct { /* software */
             struct hrtimer  hrtimer;
         };
         struct { /* tracepoint */
             /* for tp_event->class */
             struct list_head    tp_list;
         };
         struct { /* amd_power */
             u64 pwr_acc;
             u64 ptsc;
         };
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
         struct { /* breakpoint */
             /*
              * Crufty hack to avoid the chicken and egg
              * problem hw_breakpoint has with context
              * creation and event initalization.
              */
             struct arch_hw_breakpoint   info;
             struct list_head        bp_list;
         };
 #endif
         struct { /* amd_iommu */
             u8  iommu_bank;
             u8  iommu_cntr;
             u16 padding;
             u64 conf;
             u64 conf1;
         };
     };
     /*
      * If the event is a per task event, this will point to the task in
      * question. See the comment in perf_event_alloc().
      */
     struct task_struct      *target;
 
     /*
      * PMU would store hardware filter configuration
      * here.
      */
     void                *addr_filters;
 
     /* Last sync'ed generation of filters */
     unsigned long           addr_filters_gen;
 
 /*
  * hw_perf_event::state flags; used to track the PERF_EF_* state.
  */
 #define PERF_HES_STOPPED    0x01 /* the counter is stopped */
 #define PERF_HES_UPTODATE   0x02 /* event->count up-to-date */
 #define PERF_HES_ARCH       0x04
 
     int             state;
 
     /*
      * The last observed hardware counter value, updated with a
      * local64_cmpxchg() such that pmu::read() can be called nested.
      */
     local64_t           prev_count;
 
     /*
      * The period to start the next sample with.
      */
     u64             sample_period;
 
     union {
         struct { /* Sampling */
             /*
              * The period we started this sample with.
              */
             u64             last_period;
 
             /*
              * However much is left of the current period;
              * note that this is a full 64bit value and
              * allows for generation of periods longer
              * than hardware might allow.
              */
             local64_t           period_left;
         };
         struct { /* Topdown events counting for context switch */
             u64             saved_metric;
             u64             saved_slots;
         };
     };
 
     /*
      * State for throttling the event, see __perf_event_overflow() and
      * perf_adjust_freq_unthr_context().
      */
     u64                             interrupts_seq;
     u64             interrupts;
 
     /*
      * State for freq target events, see __perf_event_overflow() and
      * perf_adjust_freq_unthr_context().
      */
     u64             freq_time_stamp;
     u64             freq_count_stamp;
 #endif
 };
 
 struct perf_event;
 
 /*
  * Common implementation detail of pmu::{start,commit,cancel}_txn
  */
 #define PERF_PMU_TXN_ADD  0x1       /* txn to add/schedule event on PMU */
 #define PERF_PMU_TXN_READ 0x2       /* txn to read event group from PMU */
 
 /**
  * pmu::capabilities flags
  */
 #define PERF_PMU_CAP_NO_INTERRUPT       0x0001
 #define PERF_PMU_CAP_NO_NMI         0x0002
 #define PERF_PMU_CAP_AUX_NO_SG          0x0004
 #define PERF_PMU_CAP_EXTENDED_REGS      0x0008
 #define PERF_PMU_CAP_EXCLUSIVE          0x0010
 #define PERF_PMU_CAP_ITRACE         0x0020
 #define PERF_PMU_CAP_HETEROGENEOUS_CPUS     0x0040
 #define PERF_PMU_CAP_NO_EXCLUDE         0x0080
 #define PERF_PMU_CAP_AUX_OUTPUT         0x0100
 #define PERF_PMU_CAP_EXTENDED_HW_TYPE       0x0200
 
 struct perf_output_handle;
 
 /**
  * struct pmu - generic performance monitoring unit
  */
 struct pmu {
     struct list_head        entry;
 
     struct module           *module;
     struct device           *dev;
     const struct attribute_group    **attr_groups;
     const struct attribute_group    **attr_update;
     const char          *name;
     int             type;
 
     /*
      * various common per-pmu feature flags
      */
     int             capabilities;
 
     int __percpu            *pmu_disable_count;
     struct perf_cpu_context __percpu *pmu_cpu_context;
     atomic_t            exclusive_cnt; /* < 0: cpu; > 0: tsk */
     int             task_ctx_nr;
     int             hrtimer_interval_ms;
 
     /* number of address filters this PMU can do */
     unsigned int            nr_addr_filters;
 
     /*
      * Fully disable/enable this PMU, can be used to protect from the PMI
      * as well as for lazy/batch writing of the MSRs.
      */
     void (*pmu_enable)      (struct pmu *pmu); /* optional */
     void (*pmu_disable)     (struct pmu *pmu); /* optional */
 
     /*
      * Try and initialize the event for this PMU.
      *
      * Returns:
      *  -ENOENT -- @event is not for this PMU
      *
      *  -ENODEV -- @event is for this PMU but PMU not present
      *  -EBUSY  -- @event is for this PMU but PMU temporarily unavailable
      *  -EINVAL -- @event is for this PMU but @event is not valid
      *  -EOPNOTSUPP -- @event is for this PMU, @event is valid, but not supported
      *  -EACCES -- @event is for this PMU, @event is valid, but no privileges
      *
      *  0       -- @event is for this PMU and valid
      *
      * Other error return values are allowed.
      */
     int (*event_init)       (struct perf_event *event);
 
     /*
      * Notification that the event was mapped or unmapped.  Called
      * in the context of the mapping task.
      */
     void (*event_mapped)        (struct perf_event *event, struct mm_struct *mm); /* optional */
     void (*event_unmapped)      (struct perf_event *event, struct mm_struct *mm); /* optional */
 
     /*
      * Flags for ->add()/->del()/ ->start()/->stop(). There are
      * matching hw_perf_event::state flags.
      */
 #define PERF_EF_START   0x01        /* start the counter when adding    */
 #define PERF_EF_RELOAD  0x02        /* reload the counter when starting */
 #define PERF_EF_UPDATE  0x04        /* update the counter when stopping */
 
     /*
      * Adds/Removes a counter to/from the PMU, can be done inside a
      * transaction, see the ->*_txn() methods.
      *
      * The add/del callbacks will reserve all hardware resources required
      * to service the event, this includes any counter constraint
      * scheduling etc.
      *
      * Called with IRQs disabled and the PMU disabled on the CPU the event
      * is on.
      *
      * ->add() called without PERF_EF_START should result in the same state
      *  as ->add() followed by ->stop().
      *
      * ->del() must always PERF_EF_UPDATE stop an event. If it calls
      *  ->stop() that must deal with already being stopped without
      *  PERF_EF_UPDATE.
      */
     int  (*add)         (struct perf_event *event, int flags);
     void (*del)         (struct perf_event *event, int flags);
 
     /*
      * Starts/Stops a counter present on the PMU.
      *
      * The PMI handler should stop the counter when perf_event_overflow()
      * returns !0. ->start() will be used to continue.
      *
      * Also used to change the sample period.
      *
      * Called with IRQs disabled and the PMU disabled on the CPU the event
      * is on -- will be called from NMI context with the PMU generates
      * NMIs.
      *
      * ->stop() with PERF_EF_UPDATE will read the counter and update
      *  period/count values like ->read() would.
      *
      * ->start() with PERF_EF_RELOAD will reprogram the counter
      *  value, must be preceded by a ->stop() with PERF_EF_UPDATE.
      */
     void (*start)           (struct perf_event *event, int flags);
     void (*stop)            (struct perf_event *event, int flags);
 
     /*
      * Updates the counter value of the event.
      *
      * For sampling capable PMUs this will also update the software period
      * hw_perf_event::period_left field.
      */
     void (*read)            (struct perf_event *event);
 
     /*
      * Group events scheduling is treated as a transaction, add
      * group events as a whole and perform one schedulability test.
      * If the test fails, roll back the whole group
      *
      * Start the transaction, after this ->add() doesn't need to
      * do schedulability tests.
      *
      * Optional.
      */
     void (*start_txn)       (struct pmu *pmu, unsigned int txn_flags);
     /*
      * If ->start_txn() disabled the ->add() schedulability test
      * then ->commit_txn() is required to perform one. On success
      * the transaction is closed. On error the transaction is kept
      * open until ->cancel_txn() is called.
      *
      * Optional.
      */
     int  (*commit_txn)      (struct pmu *pmu);
     /*
      * Will cancel the transaction, assumes ->del() is called
      * for each successful ->add() during the transaction.
      *
      * Optional.
      */
     void (*cancel_txn)      (struct pmu *pmu);
 
     /*
      * Will return the value for perf_event_mmap_page::index for this event,
      * if no implementation is provided it will default to: event->hw.idx + 1.
      */
     int (*event_idx)        (struct perf_event *event); /*optional */
 
     /*
      * context-switches callback
      */
     void (*sched_task)      (struct perf_event_context *ctx,
                     bool sched_in);
 
     /*
      * Kmem cache of PMU specific data
      */
     struct kmem_cache       *task_ctx_cache;
 
     /*
      * PMU specific parts of task perf event context (i.e. ctx->task_ctx_data)
      * can be synchronized using this function. See Intel LBR callstack support
      * implementation and Perf core context switch handling callbacks for usage
      * examples.
      */
     void (*swap_task_ctx)       (struct perf_event_context *prev,
                      struct perf_event_context *next);
                     /* optional */
 
     /*
      * Set up pmu-private data structures for an AUX area
      */
     void *(*setup_aux)      (struct perf_event *event, void **pages,
                      int nr_pages, bool overwrite);
                     /* optional */
 
     /*
      * Free pmu-private AUX data structures
      */
     void (*free_aux)        (void *aux); /* optional */
 
     /*
      * Take a snapshot of the AUX buffer without touching the event
      * state, so that preempting ->start()/->stop() callbacks does
      * not interfere with their logic. Called in PMI context.
      *
      * Returns the size of AUX data copied to the output handle.
      *
      * Optional.
      */
     long (*snapshot_aux)        (struct perf_event *event,
                      struct perf_output_handle *handle,
                      unsigned long size);
 
     /*
      * Validate address range filters: make sure the HW supports the
      * requested configuration and number of filters; return 0 if the
      * supplied filters are valid, -errno otherwise.
      *
      * Runs in the context of the ioctl()ing process and is not serialized
      * with the rest of the PMU callbacks.
      */
     int (*addr_filters_validate)    (struct list_head *filters);
                     /* optional */
 
     /*
      * Synchronize address range filter configuration:
      * translate hw-agnostic filters into hardware configuration in
      * event::hw::addr_filters.
      *
      * Runs as a part of filter sync sequence that is done in ->start()
      * callback by calling perf_event_addr_filters_sync().
      *
      * May (and should) traverse event::addr_filters::list, for which its
      * caller provides necessary serialization.
      */
     void (*addr_filters_sync)   (struct perf_event *event);
                     /* optional */
 
     /*
      * Check if event can be used for aux_output purposes for
      * events of this PMU.
      *
      * Runs from perf_event_open(). Should return 0 for "no match"
      * or non-zero for "match".
      */
     int (*aux_output_match)     (struct perf_event *event);
                     /* optional */
 
     /*
      * Filter events for PMU-specific reasons.
      */
     int (*filter_match)     (struct perf_event *event); /* optional */
 
     /*
      * Check period value for PERF_EVENT_IOC_PERIOD ioctl.
      */
     int (*check_period)     (struct perf_event *event, u64 value); /* optional */
 };
 
 enum perf_addr_filter_action_t {
     PERF_ADDR_FILTER_ACTION_STOP = 0,
     PERF_ADDR_FILTER_ACTION_START,
     PERF_ADDR_FILTER_ACTION_FILTER,
 };
 
 /**
  * struct perf_addr_filter - address range filter definition
  * @entry:  event's filter list linkage
  * @path:   object file's path for file-based filters
  * @offset: filter range offset
  * @size:   filter range size (size==0 means single address trigger)
  * @action: filter/start/stop
  *
  * This is a hardware-agnostic filter configuration as specified by the user.
  */
 struct perf_addr_filter {
     struct list_head    entry;
     struct path     path;
     unsigned long       offset;
     unsigned long       size;
     enum perf_addr_filter_action_t  action;
 };
 
 /**
  * struct perf_addr_filters_head - container for address range filters
  * @list:   list of filters for this event
  * @lock:   spinlock that serializes accesses to the @list and event's
  *      (and its children's) filter generations.
  * @nr_file_filters:    number of file-based filters
  *
  * A child event will use parent's @list (and therefore @lock), so they are
  * bundled together; see perf_event_addr_filters().
  */
 struct perf_addr_filters_head {
     struct list_head    list;
     raw_spinlock_t      lock;
     unsigned int        nr_file_filters;
 };
 
 struct perf_addr_filter_range {
     unsigned long       start;
     unsigned long       size;
 };
 
 /**
  * enum perf_event_state - the states of an event:
  */
 enum perf_event_state {
     PERF_EVENT_STATE_DEAD       = -4,
     PERF_EVENT_STATE_EXIT       = -3,
     PERF_EVENT_STATE_ERROR      = -2,
     PERF_EVENT_STATE_OFF        = -1,
     PERF_EVENT_STATE_INACTIVE   =  0,
     PERF_EVENT_STATE_ACTIVE     =  1,
 };
 
 struct file;
 struct perf_sample_data;
 
 typedef void (*perf_overflow_handler_t)(struct perf_event *,
                     struct perf_sample_data *,
                     struct pt_regs *regs);
 
 /*
  * Event capabilities. For event_caps and groups caps.
  *
  * PERF_EV_CAP_SOFTWARE: Is a software event.
  * PERF_EV_CAP_READ_ACTIVE_PKG: A CPU event (or cgroup event) that can be read
  * from any CPU in the package where it is active.
  * PERF_EV_CAP_SIBLING: An event with this flag must be a group sibling and
  * cannot be a group leader. If an event with this flag is detached from the
  * group it is scheduled out and moved into an unrecoverable ERROR state.
  */
 #define PERF_EV_CAP_SOFTWARE        BIT(0)
 #define PERF_EV_CAP_READ_ACTIVE_PKG BIT(1)
 #define PERF_EV_CAP_SIBLING     BIT(2)
 
 #define SWEVENT_HLIST_BITS      8
 #define SWEVENT_HLIST_SIZE      (1 << SWEVENT_HLIST_BITS)
 
 struct swevent_hlist {
     struct hlist_head       heads[SWEVENT_HLIST_SIZE];
     struct rcu_head         rcu_head;
 };
 
 #define PERF_ATTACH_CONTEXT 0x01
 #define PERF_ATTACH_GROUP   0x02
 #define PERF_ATTACH_TASK    0x04
 #define PERF_ATTACH_TASK_DATA   0x08
 #define PERF_ATTACH_ITRACE  0x10
 #define PERF_ATTACH_SCHED_CB    0x20
 #define PERF_ATTACH_CHILD   0x40
 
 struct bpf_prog;
 struct perf_cgroup;
 struct perf_buffer;
 
 struct pmu_event_list {
     raw_spinlock_t      lock;
     struct list_head    list;
 };
 
 #define for_each_sibling_event(sibling, event)          \
     if ((event)->group_leader == (event))           \
         list_for_each_entry((sibling), &(event)->sibling_list, sibling_list)
 
 /**
  * struct perf_event - performance event kernel representation:
  */
 struct perf_event {
 #ifdef CONFIG_PERF_EVENTS
     /*
      * entry onto perf_event_context::event_list;
      *   modifications require ctx->lock
      *   RCU safe iterations.
      */
     struct list_head        event_entry;
 
     /*
      * Locked for modification by both ctx->mutex and ctx->lock; holding
      * either sufficies for read.
      */
     struct list_head        sibling_list;
     struct list_head        active_list;
     /*
      * Node on the pinned or flexible tree located at the event context;
      */
     struct rb_node          group_node;
     u64             group_index;
     /*
      * We need storage to track the entries in perf_pmu_migrate_context; we
      * cannot use the event_entry because of RCU and we want to keep the
      * group in tact which avoids us using the other two entries.
      */
     struct list_head        migrate_entry;
 
     struct hlist_node       hlist_entry;
     struct list_head        active_entry;
     int             nr_siblings;
 
     /* Not serialized. Only written during event initialization. */
     int             event_caps;
     /* The cumulative AND of all event_caps for events in this group. */
     int             group_caps;
 
     struct perf_event       *group_leader;
     struct pmu          *pmu;
     void                *pmu_private;
 
     enum perf_event_state       state;
     unsigned int            attach_state;
     local64_t           count;
     atomic64_t          child_count;
 
     /*
      * These are the total time in nanoseconds that the event
      * has been enabled (i.e. eligible to run, and the task has
      * been scheduled in, if this is a per-task event)
      * and running (scheduled onto the CPU), respectively.
      */
     u64             total_time_enabled;
     u64             total_time_running;
     u64             tstamp;
 
     struct perf_event_attr      attr;
     u16             header_size;
     u16             id_header_size;
     u16             read_size;
     struct hw_perf_event        hw;
 
     struct perf_event_context   *ctx;
     atomic_long_t           refcount;
 
     /*
      * These accumulate total time (in nanoseconds) that children
      * events have been enabled and running, respectively.
      */
     atomic64_t          child_total_time_enabled;
     atomic64_t          child_total_time_running;
 
     /*
      * Protect attach/detach and child_list:
      */
     struct mutex            child_mutex;
     struct list_head        child_list;
     struct perf_event       *parent;
 
     int             oncpu;
     int             cpu;
 
     struct list_head        owner_entry;
     struct task_struct      *owner;
 
     /* mmap bits */
     struct mutex            mmap_mutex;
     atomic_t            mmap_count;
 
     struct perf_buffer      *rb;
     struct list_head        rb_entry;
     unsigned long           rcu_batches;
     int             rcu_pending;
 
     /* poll related */
     wait_queue_head_t       waitq;
     struct fasync_struct        *fasync;
 
     /* delayed work for NMIs and such */
     int             pending_wakeup;
     int             pending_kill;
     int             pending_disable;
     unsigned long           pending_addr;   /* SIGTRAP */
     struct irq_work         pending;
 
     atomic_t            event_limit;
 
     /* address range filters */
     struct perf_addr_filters_head   addr_filters;
     /* vma address array for file-based filders */
     struct perf_addr_filter_range   *addr_filter_ranges;
     unsigned long           addr_filters_gen;
 
     /* for aux_output events */
     struct perf_event       *aux_event;
 
     void (*destroy)(struct perf_event *);
     struct rcu_head         rcu_head;
 
     struct pid_namespace        *ns;
     u64             id;
 
     atomic64_t          lost_samples;
 
     u64             (*clock)(void);
     perf_overflow_handler_t     overflow_handler;
     void                *overflow_handler_context;
 #ifdef CONFIG_BPF_SYSCALL
     perf_overflow_handler_t     orig_overflow_handler;
     struct bpf_prog         *prog;
     u64             bpf_cookie;
 #endif
 
 #ifdef CONFIG_EVENT_TRACING
     struct trace_event_call     *tp_event;
     struct event_filter     *filter;
 #ifdef CONFIG_FUNCTION_TRACER
     struct ftrace_ops               ftrace_ops;
 #endif
 #endif
 
 #ifdef CONFIG_CGROUP_PERF
     struct perf_cgroup      *cgrp; /* cgroup event is attach to */
 #endif
 
 #ifdef CONFIG_SECURITY
     void *security;
 #endif
     struct list_head        sb_list;
 #endif /* CONFIG_PERF_EVENTS */
 };
 
 
 struct perf_event_groups {
     struct rb_root  tree;
     u64     index;
 };
 
 /**
  * struct perf_event_context - event context structure
  *
  * Used as a container for task events and CPU events as well:
  */
 struct perf_event_context {
     struct pmu          *pmu;
     /*
      * Protect the states of the events in the list,
      * nr_active, and the list:
      */
     raw_spinlock_t          lock;
     /*
      * Protect the list of events.  Locking either mutex or lock
      * is sufficient to ensure the list doesn't change; to change
      * the list you need to lock both the mutex and the spinlock.
      */
     struct mutex            mutex;
 
     struct list_head        active_ctx_list;
     struct perf_event_groups    pinned_groups;
     struct perf_event_groups    flexible_groups;
     struct list_head        event_list;
 
     struct list_head        pinned_active;
     struct list_head        flexible_active;
 
     int             nr_events;
     int             nr_active;
     int             nr_user;
     int             is_active;
     int             nr_stat;
     int             nr_freq;
     int             rotate_disable;
     /*
      * Set when nr_events != nr_active, except tolerant to events not
      * necessary to be active due to scheduling constraints, such as cgroups.
      */
     int             rotate_necessary;
     refcount_t          refcount;
     struct task_struct      *task;
 
     /*
      * Context clock, runs when context enabled.
      */
     u64             time;
     u64             timestamp;
     u64             timeoffset;
 
     /*
      * These fields let us detect when two contexts have both
      * been cloned (inherited) from a common ancestor.
      */
     struct perf_event_context   *parent_ctx;
     u64             parent_gen;
     u64             generation;
     int             pin_count;
 #ifdef CONFIG_CGROUP_PERF
     int             nr_cgroups;  /* cgroup evts */
 #endif
     void                *task_ctx_data; /* pmu specific data */
     struct rcu_head         rcu_head;
 };
 
 /*
  * Number of contexts where an event can trigger:
  *  task, softirq, hardirq, nmi.
  */
 #define PERF_NR_CONTEXTS    4
 
 /**
  * struct perf_cpu_context - per cpu event context structure
  */
 struct perf_cpu_context {
     struct perf_event_context   ctx;
     struct perf_event_context   *task_ctx;
     int             active_oncpu;
     int             exclusive;
 
     raw_spinlock_t          hrtimer_lock;
     struct hrtimer          hrtimer;
     ktime_t             hrtimer_interval;
     unsigned int            hrtimer_active;
 
 #ifdef CONFIG_CGROUP_PERF
     struct perf_cgroup      *cgrp;
     struct list_head        cgrp_cpuctx_entry;
 #endif
 
     struct list_head        sched_cb_entry;
     int             sched_cb_usage;
 
     int             online;
     /*
      * Per-CPU storage for iterators used in visit_groups_merge. The default
      * storage is of size 2 to hold the CPU and any CPU event iterators.
      */
     int             heap_size;
     struct perf_event       **heap;
     struct perf_event       *heap_default[2];
 };
 
 struct perf_output_handle {
     struct perf_event       *event;
     struct perf_buffer      *rb;
     unsigned long           wakeup;
     unsigned long           size;
     u64             aux_flags;
     union {
         void            *addr;
         unsigned long       head;
     };
     int             page;
 };
 
 struct bpf_perf_event_data_kern {
     bpf_user_pt_regs_t *regs;
     struct perf_sample_data *data;
     struct perf_event *event;
 };
 
 #ifdef CONFIG_CGROUP_PERF
 
 /*
  * perf_cgroup_info keeps track of time_enabled for a cgroup.
  * This is a per-cpu dynamically allocated data structure.
  */
 struct perf_cgroup_info {
     u64             time;
     u64             timestamp;
     u64             timeoffset;
     int             active;
 };
 
 struct perf_cgroup {
     struct cgroup_subsys_state  css;
     struct perf_cgroup_info __percpu *info;
 };
 
 /*
  * Must ensure cgroup is pinned (css_get) before calling
  * this function. In other words, we cannot call this function
  * if there is no cgroup event for the current CPU context.
  */
 static inline struct perf_cgroup *
 perf_cgroup_from_task(struct task_struct *task, struct perf_event_context *ctx)
 {
     return container_of(task_css_check(task, perf_event_cgrp_id,
                        ctx ? lockdep_is_held(&ctx->lock)
                            : true),
                 struct perf_cgroup, css);
 }
 #endif /* CONFIG_CGROUP_PERF */
 
 #ifdef CONFIG_PERF_EVENTS
 
 extern void *perf_aux_output_begin(struct perf_output_handle *handle,
                    struct perf_event *event);
 extern void perf_aux_output_end(struct perf_output_handle *handle,
                 unsigned long size);
 extern int perf_aux_output_skip(struct perf_output_handle *handle,
                 unsigned long size);
 extern void *perf_get_aux(struct perf_output_handle *handle);
 extern void perf_aux_output_flag(struct perf_output_handle *handle, u64 flags);
 extern void perf_event_itrace_started(struct perf_event *event);
 
 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
 extern void perf_pmu_unregister(struct pmu *pmu);
 
 extern void __perf_event_task_sched_in(struct task_struct *prev,
                        struct task_struct *task);
 extern void __perf_event_task_sched_out(struct task_struct *prev,
                     struct task_struct *next);
 extern int perf_event_init_task(struct task_struct *child, u64 clone_flags);
 extern void perf_event_exit_task(struct task_struct *child);
 extern void perf_event_free_task(struct task_struct *task);
 extern void perf_event_delayed_put(struct task_struct *task);
 extern struct file *perf_event_get(unsigned int fd);
 extern const struct perf_event *perf_get_event(struct file *file);
 extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event);
 extern void perf_event_print_debug(void);
 extern void perf_pmu_disable(struct pmu *pmu);
 extern void perf_pmu_enable(struct pmu *pmu);
 extern void perf_sched_cb_dec(struct pmu *pmu);
 extern void perf_sched_cb_inc(struct pmu *pmu);
 extern int perf_event_task_disable(void);
 extern int perf_event_task_enable(void);
 
 extern void perf_pmu_resched(struct pmu *pmu);
 
 extern int perf_event_refresh(struct perf_event *event, int refresh);
 extern void perf_event_update_userpage(struct perf_event *event);
 extern int perf_event_release_kernel(struct perf_event *event);
 extern struct perf_event *
 perf_event_create_kernel_counter(struct perf_event_attr *attr,
                 int cpu,
                 struct task_struct *task,
                 perf_overflow_handler_t callback,
                 void *context);
 extern void perf_pmu_migrate_context(struct pmu *pmu,
                 int src_cpu, int dst_cpu);
 int perf_event_read_local(struct perf_event *event, u64 *value,
               u64 *enabled, u64 *running);
 extern u64 perf_event_read_value(struct perf_event *event,
                  u64 *enabled, u64 *running);
 
 
 struct perf_sample_data {
     /*
      * Fields set by perf_sample_data_init(), group so as to
      * minimize the cachelines touched.
      */
     u64             addr;
     struct perf_raw_record      *raw;
     struct perf_branch_stack    *br_stack;
     u64             period;
     union perf_sample_weight    weight;
     u64             txn;
     union  perf_mem_data_src    data_src;
 
     /*
      * The other fields, optionally {set,used} by
      * perf_{prepare,output}_sample().
      */
     u64             type;
     u64             ip;
     struct {
         u32 pid;
         u32 tid;
     }               tid_entry;
     u64             time;
     u64             id;
     u64             stream_id;
     struct {
         u32 cpu;
         u32 reserved;
     }               cpu_entry;
     struct perf_callchain_entry *callchain;
     u64             aux_size;
 
     struct perf_regs        regs_user;
     struct perf_regs        regs_intr;
     u64             stack_user_size;
 
     u64             phys_addr;
     u64             cgroup;
     u64             data_page_size;
     u64             code_page_size;
 } ____cacheline_aligned;
 
 /* default value for data source */
 #define PERF_MEM_NA (PERF_MEM_S(OP, NA)   |\
             PERF_MEM_S(LVL, NA)   |\
             PERF_MEM_S(SNOOP, NA) |\
             PERF_MEM_S(LOCK, NA)  |\
             PERF_MEM_S(TLB, NA))
 
 static inline void perf_sample_data_init(struct perf_sample_data *data,
                      u64 addr, u64 period)
 {
     /* remaining struct members initialized in perf_prepare_sample() */
     data->addr = addr;
     data->raw  = NULL;
     data->br_stack = NULL;
     data->period = period;
     data->weight.full = 0;
     data->data_src.val = PERF_MEM_NA;
     data->txn = 0;
 }
 
 /*
  * Clear all bitfields in the perf_branch_entry.
  * The to and from fields are not cleared because they are
  * systematically modified by caller.
  */
 static inline void perf_clear_branch_entry_bitfields(struct perf_branch_entry *br)
 {
     br->mispred = 0;
     br->predicted = 0;
     br->in_tx = 0;
     br->abort = 0;
     br->cycles = 0;
     br->type = 0;
     br->reserved = 0;
 }
 
 extern void perf_output_sample(struct perf_output_handle *handle,
                    struct perf_event_header *header,
                    struct perf_sample_data *data,
                    struct perf_event *event);
 extern void perf_prepare_sample(struct perf_event_header *header,
                 struct perf_sample_data *data,
                 struct perf_event *event,
                 struct pt_regs *regs);
 
 extern int perf_event_overflow(struct perf_event *event,
                  struct perf_sample_data *data,
                  struct pt_regs *regs);
 
 extern void perf_event_output_forward(struct perf_event *event,
                      struct perf_sample_data *data,
                      struct pt_regs *regs);
 extern void perf_event_output_backward(struct perf_event *event,
                        struct perf_sample_data *data,
                        struct pt_regs *regs);
 extern int perf_event_output(struct perf_event *event,
                  struct perf_sample_data *data,
                  struct pt_regs *regs);
 
 static inline bool
 is_default_overflow_handler(struct perf_event *event)
 {
     if (likely(event->overflow_handler == perf_event_output_forward))
         return true;
     if (unlikely(event->overflow_handler == perf_event_output_backward))
         return true;
     return false;
 }
 
 extern void
 perf_event_header__init_id(struct perf_event_header *header,
                struct perf_sample_data *data,
                struct perf_event *event);
 extern void
 perf_event__output_id_sample(struct perf_event *event,
                  struct perf_output_handle *handle,
                  struct perf_sample_data *sample);
 
 extern void
 perf_log_lost_samples(struct perf_event *event, u64 lost);
 
 static inline bool event_has_any_exclude_flag(struct perf_event *event)
 {
     struct perf_event_attr *attr = &event->attr;
 
     return attr->exclude_idle || attr->exclude_user ||
            attr->exclude_kernel || attr->exclude_hv ||
            attr->exclude_guest || attr->exclude_host;
 }
 
 static inline bool is_sampling_event(struct perf_event *event)
 {
     return event->attr.sample_period != 0;
 }
 
 /*
  * Return 1 for a software event, 0 for a hardware event
  */
 static inline int is_software_event(struct perf_event *event)
 {
     return event->event_caps & PERF_EV_CAP_SOFTWARE;
 }
 
 /*
  * Return 1 for event in sw context, 0 for event in hw context
  */
 static inline int in_software_context(struct perf_event *event)
 {
     return event->ctx->pmu->task_ctx_nr == perf_sw_context;
 }
 
 static inline int is_exclusive_pmu(struct pmu *pmu)
 {
     return pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE;
 }
 
 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
 
 extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64);
 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
 
 #ifndef perf_arch_fetch_caller_regs
 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
 #endif
 
 /*
  * When generating a perf sample in-line, instead of from an interrupt /
  * exception, we lack a pt_regs. This is typically used from software events
  * like: SW_CONTEXT_SWITCHES, SW_MIGRATIONS and the tie-in with tracepoints.
  *
  * We typically don't need a full set, but (for x86) do require:
  * - ip for PERF_SAMPLE_IP
  * - cs for user_mode() tests
  * - sp for PERF_SAMPLE_CALLCHAIN
  * - eflags for MISC bits and CALLCHAIN (see: perf_hw_regs())
  *
  * NOTE: assumes @regs is otherwise already 0 filled; this is important for
  * things like PERF_SAMPLE_REGS_INTR.
  */
 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
 {
     perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
 }
 
 static __always_inline void
 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
 {
     if (static_key_false(&perf_swevent_enabled[event_id]))
         __perf_sw_event(event_id, nr, regs, addr);
 }
 
 DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]);
 
 /*
  * 'Special' version for the scheduler, it hard assumes no recursion,
  * which is guaranteed by us not actually scheduling inside other swevents
  * because those disable preemption.
  */
 static __always_inline void __perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)
 {
     struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
 
     perf_fetch_caller_regs(regs);
     ___perf_sw_event(event_id, nr, regs, addr);
 }
 
 extern struct static_key_false perf_sched_events;
 
 static __always_inline bool __perf_sw_enabled(int swevt)
 {
     return static_key_false(&perf_swevent_enabled[swevt]);
 }
 
 static inline void perf_event_task_migrate(struct task_struct *task)
 {
     if (__perf_sw_enabled(PERF_COUNT_SW_CPU_MIGRATIONS))
         task->sched_migrated = 1;
 }
 
 static inline void perf_event_task_sched_in(struct task_struct *prev,
                         struct task_struct *task)
 {
     if (static_branch_unlikely(&perf_sched_events))
         __perf_event_task_sched_in(prev, task);
 
     if (__perf_sw_enabled(PERF_COUNT_SW_CPU_MIGRATIONS) &&
         task->sched_migrated) {
         __perf_sw_event_sched(PERF_COUNT_SW_CPU_MIGRATIONS, 1, 0);
         task->sched_migrated = 0;
     }
 }
 
 static inline void perf_event_task_sched_out(struct task_struct *prev,
                          struct task_struct *next)
 {
     if (__perf_sw_enabled(PERF_COUNT_SW_CONTEXT_SWITCHES))
         __perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);
 
 #ifdef CONFIG_CGROUP_PERF
     if (__perf_sw_enabled(PERF_COUNT_SW_CGROUP_SWITCHES) &&
         perf_cgroup_from_task(prev, NULL) !=
         perf_cgroup_from_task(next, NULL))
         __perf_sw_event_sched(PERF_COUNT_SW_CGROUP_SWITCHES, 1, 0);
 #endif
 
     if (static_branch_unlikely(&perf_sched_events))
         __perf_event_task_sched_out(prev, next);
 }
 
 extern void perf_event_mmap(struct vm_area_struct *vma);
 
 extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
                    bool unregister, const char *sym);
 extern void perf_event_bpf_event(struct bpf_prog *prog,
                  enum perf_bpf_event_type type,
                  u16 flags);
 
 #ifdef CONFIG_GUEST_PERF_EVENTS
 extern struct perf_guest_info_callbacks __rcu *perf_guest_cbs;
 
 DECLARE_STATIC_CALL(__perf_guest_state, *perf_guest_cbs->state);
 DECLARE_STATIC_CALL(__perf_guest_get_ip, *perf_guest_cbs->get_ip);
 DECLARE_STATIC_CALL(__perf_guest_handle_intel_pt_intr, *perf_guest_cbs->handle_intel_pt_intr);
 
 static inline unsigned int perf_guest_state(void)
 {
     return static_call(__perf_guest_state)();
 }
 static inline unsigned long perf_guest_get_ip(void)
 {
     return static_call(__perf_guest_get_ip)();
 }
 static inline unsigned int perf_guest_handle_intel_pt_intr(void)
 {
     return static_call(__perf_guest_handle_intel_pt_intr)();
 }
 extern void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs);
 extern void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs);
 #else
 static inline unsigned int perf_guest_state(void)        { return 0; }
 static inline unsigned long perf_guest_get_ip(void)      { return 0; }
 static inline unsigned int perf_guest_handle_intel_pt_intr(void) { return 0; }
 #endif /* CONFIG_GUEST_PERF_EVENTS */
 
 extern void perf_event_exec(void);
 extern void perf_event_comm(struct task_struct *tsk, bool exec);
 extern void perf_event_namespaces(struct task_struct *tsk);
 extern void perf_event_fork(struct task_struct *tsk);
 extern void perf_event_text_poke(const void *addr,
                  const void *old_bytes, size_t old_len,
                  const void *new_bytes, size_t new_len);
 
 /* Callchains */
 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
 
 extern void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs);
 extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs);
 extern struct perf_callchain_entry *
 get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
            u32 max_stack, bool crosstask, bool add_mark);
 extern struct perf_callchain_entry *perf_callchain(struct perf_event *event, struct pt_regs *regs);
 extern int get_callchain_buffers(int max_stack);
 extern void put_callchain_buffers(void);
 extern struct perf_callchain_entry *get_callchain_entry(int *rctx);
 extern void put_callchain_entry(int rctx);
 
 extern int sysctl_perf_event_max_stack;
 extern int sysctl_perf_event_max_contexts_per_stack;
 
 static inline int perf_callchain_store_context(struct perf_callchain_entry_ctx *ctx, u64 ip)
 {
     if (ctx->contexts < sysctl_perf_event_max_contexts_per_stack) {
         struct perf_callchain_entry *entry = ctx->entry;
         entry->ip[entry->nr++] = ip;
         ++ctx->contexts;
         return 0;
     } else {
         ctx->contexts_maxed = true;
         return -1; /* no more room, stop walking the stack */
     }
 }
 
 static inline int perf_callchain_store(struct perf_callchain_entry_ctx *ctx, u64 ip)
 {
     if (ctx->nr < ctx->max_stack && !ctx->contexts_maxed) {
         struct perf_callchain_entry *entry = ctx->entry;
         entry->ip[entry->nr++] = ip;
         ++ctx->nr;
         return 0;
     } else {
         return -1; /* no more room, stop walking the stack */
     }
 }
 
 extern int sysctl_perf_event_paranoid;
 extern int sysctl_perf_event_mlock;
 extern int sysctl_perf_event_sample_rate;
 extern int sysctl_perf_cpu_time_max_percent;
 
 extern void perf_sample_event_took(u64 sample_len_ns);
 
 int perf_proc_update_handler(struct ctl_table *table, int write,
         void *buffer, size_t *lenp, loff_t *ppos);
 int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
         void *buffer, size_t *lenp, loff_t *ppos);
 int perf_event_max_stack_handler(struct ctl_table *table, int write,
         void *buffer, size_t *lenp, loff_t *ppos);
 
 /* Access to perf_event_open(2) syscall. */
 #define PERF_SECURITY_OPEN      0
 
 /* Finer grained perf_event_open(2) access control. */
 #define PERF_SECURITY_CPU       1
 #define PERF_SECURITY_KERNEL        2
 #define PERF_SECURITY_TRACEPOINT    3
 
 static inline int perf_is_paranoid(void)
 {
     return sysctl_perf_event_paranoid > -1;
 }
 
 static inline int perf_allow_kernel(struct perf_event_attr *attr)
 {
     if (sysctl_perf_event_paranoid > 1 && !perfmon_capable())
         return -EACCES;
 
     return security_perf_event_open(attr, PERF_SECURITY_KERNEL);
 }
 
 static inline int perf_allow_cpu(struct perf_event_attr *attr)
 {
     if (sysctl_perf_event_paranoid > 0 && !perfmon_capable())
         return -EACCES;
 
     return security_perf_event_open(attr, PERF_SECURITY_CPU);
 }
 
 static inline int perf_allow_tracepoint(struct perf_event_attr *attr)
 {
     if (sysctl_perf_event_paranoid > -1 && !perfmon_capable())
         return -EPERM;
 
     return security_perf_event_open(attr, PERF_SECURITY_TRACEPOINT);
 }
 
 extern void perf_event_init(void);
 extern void perf_tp_event(u16 event_type, u64 count, void *record,
               int entry_size, struct pt_regs *regs,
               struct hlist_head *head, int rctx,
               struct task_struct *task);
 extern void perf_bp_event(struct perf_event *event, void *data);
 
 #ifndef perf_misc_flags
 # define perf_misc_flags(regs) \
         (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
 # define perf_instruction_pointer(regs) instruction_pointer(regs)
 #endif
 #ifndef perf_arch_bpf_user_pt_regs
 # define perf_arch_bpf_user_pt_regs(regs) regs
 #endif
 
 static inline bool has_branch_stack(struct perf_event *event)
 {
     return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
 }
 
 static inline bool needs_branch_stack(struct perf_event *event)
 {
     return event->attr.branch_sample_type != 0;
 }
 
 static inline bool has_aux(struct perf_event *event)
 {
     return event->pmu->setup_aux;
 }
 
 static inline bool is_write_backward(struct perf_event *event)
 {
     return !!event->attr.write_backward;
 }
 
 static inline bool has_addr_filter(struct perf_event *event)
 {
     return event->pmu->nr_addr_filters;
 }
 
 /*
  * An inherited event uses parent's filters
  */
 static inline struct perf_addr_filters_head *
 perf_event_addr_filters(struct perf_event *event)
 {
     struct perf_addr_filters_head *ifh = &event->addr_filters;
 
     if (event->parent)
         ifh = &event->parent->addr_filters;
 
     return ifh;
 }
 
 extern void perf_event_addr_filters_sync(struct perf_event *event);
 extern void perf_report_aux_output_id(struct perf_event *event, u64 hw_id);
 
 extern int perf_output_begin(struct perf_output_handle *handle,
                  struct perf_sample_data *data,
                  struct perf_event *event, unsigned int size);
 extern int perf_output_begin_forward(struct perf_output_handle *handle,
                      struct perf_sample_data *data,
                      struct perf_event *event,
                      unsigned int size);
 extern int perf_output_begin_backward(struct perf_output_handle *handle,
                       struct perf_sample_data *data,
                       struct perf_event *event,
                       unsigned int size);
 
 extern void perf_output_end(struct perf_output_handle *handle);
 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
                  const void *buf, unsigned int len);
 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
                      unsigned int len);
 extern long perf_output_copy_aux(struct perf_output_handle *aux_handle,
                  struct perf_output_handle *handle,
                  unsigned long from, unsigned long to);
 extern int perf_swevent_get_recursion_context(void);
 extern void perf_swevent_put_recursion_context(int rctx);
 extern u64 perf_swevent_set_period(struct perf_event *event);
 extern void perf_event_enable(struct perf_event *event);
 extern void perf_event_disable(struct perf_event *event);
 extern void perf_event_disable_local(struct perf_event *event);
 extern void perf_event_disable_inatomic(struct perf_event *event);
 extern void perf_event_task_tick(void);
 extern int perf_event_account_interrupt(struct perf_event *event);
 extern int perf_event_period(struct perf_event *event, u64 value);
 extern u64 perf_event_pause(struct perf_event *event, bool reset);
 #else /* !CONFIG_PERF_EVENTS: */
 static inline void *
 perf_aux_output_begin(struct perf_output_handle *handle,
               struct perf_event *event)             { return NULL; }
 static inline void
 perf_aux_output_end(struct perf_output_handle *handle, unsigned long size)
                                     { }
 static inline int
 perf_aux_output_skip(struct perf_output_handle *handle,
              unsigned long size)                { return -EINVAL; }
 static inline void *
 perf_get_aux(struct perf_output_handle *handle)             { return NULL; }
 static inline void
 perf_event_task_migrate(struct task_struct *task)           { }
 static inline void
 perf_event_task_sched_in(struct task_struct *prev,
              struct task_struct *task)          { }
 static inline void
 perf_event_task_sched_out(struct task_struct *prev,
               struct task_struct *next)         { }
 static inline int perf_event_init_task(struct task_struct *child,
                        u64 clone_flags)         { return 0; }
 static inline void perf_event_exit_task(struct task_struct *child)  { }
 static inline void perf_event_free_task(struct task_struct *task)   { }
 static inline void perf_event_delayed_put(struct task_struct *task) { }
 static inline struct file *perf_event_get(unsigned int fd)  { return ERR_PTR(-EINVAL); }
 static inline const struct perf_event *perf_get_event(struct file *file)
 {
     return ERR_PTR(-EINVAL);
 }
 static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event)
 {
     return ERR_PTR(-EINVAL);
 }
 static inline int perf_event_read_local(struct perf_event *event, u64 *value,
                     u64 *enabled, u64 *running)
 {
     return -EINVAL;
 }
 static inline void perf_event_print_debug(void)             { }
 static inline int perf_event_task_disable(void)             { return -EINVAL; }
 static inline int perf_event_task_enable(void)              { return -EINVAL; }
 static inline int perf_event_refresh(struct perf_event *event, int refresh)
 {
     return -EINVAL;
 }
 
 static inline void
 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
 static inline void
 perf_bp_event(struct perf_event *event, void *data)         { }
 
 static inline void perf_event_mmap(struct vm_area_struct *vma)      { }
 
 typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data);
 static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len,
                       bool unregister, const char *sym) { }
 static inline void perf_event_bpf_event(struct bpf_prog *prog,
                     enum perf_bpf_event_type type,
                     u16 flags)          { }
 static inline void perf_event_exec(void)                { }
 static inline void perf_event_comm(struct task_struct *tsk, bool exec)  { }
 static inline void perf_event_namespaces(struct task_struct *tsk)   { }
 static inline void perf_event_fork(struct task_struct *tsk)     { }
 static inline void perf_event_text_poke(const void *addr,
                     const void *old_bytes,
                     size_t old_len,
                     const void *new_bytes,
                     size_t new_len)         { }
 static inline void perf_event_init(void)                { }
 static inline int  perf_swevent_get_recursion_context(void)     { return -1; }
 static inline void perf_swevent_put_recursion_context(int rctx)     { }
 static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; }
 static inline void perf_event_enable(struct perf_event *event)      { }
 static inline void perf_event_disable(struct perf_event *event)     { }
 static inline int __perf_event_disable(void *info)          { return -1; }
 static inline void perf_event_task_tick(void)               { }
 static inline int perf_event_release_kernel(struct perf_event *event)   { return 0; }
 static inline int perf_event_period(struct perf_event *event, u64 value)
 {
     return -EINVAL;
 }
 static inline u64 perf_event_pause(struct perf_event *event, bool reset)
 {
     return 0;
 }
 #endif
 
 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
 extern void perf_restore_debug_store(void);
 #else
 static inline void perf_restore_debug_store(void)           { }
 #endif
 
 static __always_inline bool perf_raw_frag_last(const struct perf_raw_frag *frag)
 {
     return frag->pad < sizeof(u64);
 }
 
 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
 
 struct perf_pmu_events_attr {
     struct device_attribute attr;
     u64 id;
     const char *event_str;
 };
 
 struct perf_pmu_events_ht_attr {
     struct device_attribute         attr;
     u64                 id;
     const char              *event_str_ht;
     const char              *event_str_noht;
 };
 
 struct perf_pmu_events_hybrid_attr {
     struct device_attribute         attr;
     u64                 id;
     const char              *event_str;
     u64                 pmu_type;
 };
 
 struct perf_pmu_format_hybrid_attr {
     struct device_attribute         attr;
     u64                 pmu_type;
 };
 
 ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
                   char *page);
 
 #define PMU_EVENT_ATTR(_name, _var, _id, _show)             \
 static struct perf_pmu_events_attr _var = {             \
     .attr = __ATTR(_name, 0444, _show, NULL),           \
     .id   =  _id,                           \
 };
 
 #define PMU_EVENT_ATTR_STRING(_name, _var, _str)                \
 static struct perf_pmu_events_attr _var = {                 \
     .attr       = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \
     .id     = 0,                            \
     .event_str  = _str,                         \
 };
 
 #define PMU_EVENT_ATTR_ID(_name, _show, _id)                \
     (&((struct perf_pmu_events_attr[]) {                \
         { .attr = __ATTR(_name, 0444, _show, NULL),     \
           .id = _id, }                      \
     })[0].attr.attr)
 
 #define PMU_FORMAT_ATTR(_name, _format)                 \
 static ssize_t                              \
 _name##_show(struct device *dev,                    \
                    struct device_attribute *attr,       \
                    char *page)              \
 {                                   \
     BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE);         \
     return sprintf(page, _format "\n");             \
 }                                   \
                                     \
 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
 
 /* Performance counter hotplug functions */
 #ifdef CONFIG_PERF_EVENTS
 int perf_event_init_cpu(unsigned int cpu);
 int perf_event_exit_cpu(unsigned int cpu);
 #else
 #define perf_event_init_cpu NULL
 #define perf_event_exit_cpu NULL
 #endif
 
 extern void __weak arch_perf_update_userpage(struct perf_event *event,
                          struct perf_event_mmap_page *userpg,
                          u64 now);
 
 #ifdef CONFIG_MMU
 extern __weak u64 arch_perf_get_page_size(struct mm_struct *mm, unsigned long addr);
 #endif
 
 /*
  * Snapshot branch stack on software events.
  *
  * Branch stack can be very useful in understanding software events. For
  * example, when a long function, e.g. sys_perf_event_open, returns an
  * errno, it is not obvious why the function failed. Branch stack could
  * provide very helpful information in this type of scenarios.
  *
  * On software event, it is necessary to stop the hardware branch recorder
  * fast. Otherwise, the hardware register/buffer will be flushed with
  * entries of the triggering event. Therefore, static call is used to
  * stop the hardware recorder.
  */
 
 /*
  * cnt is the number of entries allocated for entries.
  * Return number of entries copied to .
  */
 typedef int (perf_snapshot_branch_stack_t)(struct perf_branch_entry *entries,
                        unsigned int cnt);
 DECLARE_STATIC_CALL(perf_snapshot_branch_stack, perf_snapshot_branch_stack_t);
 
 #ifndef PERF_NEEDS_LOPWR_CB
 static inline void perf_lopwr_cb(bool mode)
 {
 }
 #endif
 
 #endif /* _LINUX_PERF_EVENT_H */

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