/*
 * 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

struct perf_guest_info_callbacks {
        int                             (*is_in_guest)(void);
        int                             (*is_user_mode)(void);
        unsigned long                   (*get_guest_ip)(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/workqueue.h>
#ifndef __GENKSYMS__
#include <linux/cgroup.h>
#endif
#include <asm/local.h>

#include <linux/rh_kabi.h>

struct perf_callchain_entry {
        __u64                           nr;
        __u64                           ip[PERF_MAX_STACK_DEPTH];
};

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 {
        u32                                     size;
        RH_KABI_DEPRECATE(void *,               data)
        RH_KABI_EXTEND(struct perf_raw_frag     frag)
};

/*
 * branch stack layout:
 *  nr: number of taken branches stored in entries[]
 *
 * 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.
 */
struct perf_branch_stack {
        __u64                           nr;
        struct perf_branch_entry        entries[0];
};

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[] */
};

struct event_constraint;

/**
 * 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 */
                        RH_KABI_DEPRECATE(struct task_struct*, tp_target)
                        /* for tp_event->class */
                        struct list_head        tp_list;
                };
#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.
                         */
                        RH_KABI_DEPRECATE(struct task_struct*, bp_target)
                        struct arch_hw_breakpoint       info;
                        struct list_head                bp_list;
                };
#endif
        };
        int                             state;
        local64_t                       prev_count;
        u64                             sample_period;
        u64                             last_period;
        local64_t                       period_left;
        u64                             interrupts_seq;
        u64                             interrupts;

        u64                             freq_time_stamp;
        u64                             freq_count_stamp;

        RH_KABI_EXTEND(struct event_constraint *constraint)
        RH_KABI_EXTEND(struct task_struct       *target)

        /*
         * PMU would store hardware filter configuration
         * here.
         */
        RH_KABI_EXTEND(void                     *addr_filters)

        /* Last sync'ed generation of filters */
        RH_KABI_EXTEND(unsigned long            addr_filters_gen)
#endif
};

/*
 * hw_perf_event::state flags
 */
#define PERF_HES_STOPPED        0x01 /* the counter is stopped */
#define PERF_HES_UPTODATE       0x02 /* event->count up-to-date */
#define PERF_HES_ARCH           0x04

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               0x01
#define PERF_PMU_CAP_NO_NMI                     0x02
#define PERF_PMU_CAP_AUX_NO_SG                  0x04
#define PERF_PMU_CAP_AUX_SW_DOUBLEBUF           0x08
#define PERF_PMU_CAP_EXCLUSIVE                  0x10
#define PERF_PMU_CAP_ITRACE                     0x20

/**
 * struct pmu - generic performance monitoring unit
 */
struct pmu {
        struct list_head                entry;

        struct device                   *dev;
        const struct attribute_group    **attr_groups;
        const char                      *name;
        int                             type;

        int * __percpu                  pmu_disable_count;
        struct perf_cpu_context * __percpu pmu_cpu_context;
        int                             task_ctx_nr;
        int                             hrtimer_interval_ms;

        /*
         * 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.
         * Should return -ENOENT when the @event doesn't match this PMU.
         */
        int (*event_init)               (struct perf_event *event);

#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.
         */
        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.
         */
        void (*start)                   (struct perf_event *event, int flags);
        void (*stop)                    (struct perf_event *event, int flags);

        /*
         * Updates the counter value of the event.
         */
        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.
         */
        RH_KABI_REPLACE(void (*start_txn)(struct pmu *pmu),
                        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 */

        /*
         * flush branch stack on context-switches (needed in cpu-wide mode)
         */
#ifdef __GENKSYMS__
        void (*flush_branch_stack)      (void);
#else
        /* KABI this pointer is deprecated */
        void (*rh_reserved_flush_branch_stack)  (void);
#endif

        RH_KABI_EXTEND(struct module *module)

        /*
         * various common per-pmu feature flags
         */
        RH_KABI_EXTEND(int      capabilities)

        /*
         * context-switches callback
         */
        RH_KABI_EXTEND(void (*sched_task) (struct perf_event_context *ctx, bool sched_in))

        /*
         * PMU specific data size
         */
        RH_KABI_EXTEND(size_t task_ctx_size)

        /*
         * Set up pmu-private data structures for an AUX area
         */
        RH_KABI_EXTEND(void *(*setup_aux)               (int cpu, void **pages,
                                         int nr_pages, bool overwrite))
                                        /* optional */

        /*
         * Free pmu-private AUX data structures
         */
        RH_KABI_EXTEND(void (*free_aux)         (void *aux)) /* optional */
        RH_KABI_EXTEND(atomic_t                 exclusive_cnt) /* < 0: cpu; > 0: tsk */


        /*
         * 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.
         */
        RH_KABI_EXTEND(int (*addr_filters_validate)     (struct list_head *filters))

        /*
         * 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.
         */
        RH_KABI_EXTEND(void (*addr_filters_sync)        (struct perf_event *event))
                                        /* optional */

        /* number of address filters this PMU can do */
        RH_KABI_EXTEND(unsigned int                     nr_addr_filters)
};

/**
 * struct perf_addr_filter - address range filter definition
 * @entry:      event's filter list linkage
 * @inode:      object file's inode for file-based filters
 * @offset:     filter range offset
 * @size:       filter range size
 * @range:      1: range, 0: address
 * @filter:     1: filter/start, 0: stop
 *
 * This is a hardware-agnostic filter configuration as specified by the user.
 */
struct perf_addr_filter {
        struct list_head        entry;
        struct inode            *inode;
        unsigned long           offset;
        unsigned long           size;
        unsigned int            range   : 1,
                                filter  : 1;
};

/**
 * 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;
};

/**
 * enum perf_event_active_state - the states of a event
 */
enum perf_event_active_state {
#ifndef __GENKSYMS__
        PERF_EVENT_STATE_DEAD           = -4,
        PERF_EVENT_STATE_EXIT           = -3,
#endif
        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.
 */
#define PERF_EV_CAP_SOFTWARE            BIT(0)
#define PERF_EV_CAP_READ_ACTIVE_PKG     BIT(1)

#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

struct perf_cgroup;
struct ring_buffer;

struct pmu_event_list {
        raw_spinlock_t          lock;
        struct list_head        list;
};

/**
 * struct perf_event - performance event kernel representation:
 */
struct perf_event {
#ifdef CONFIG_PERF_EVENTS
        /*
         * XXX: group_entry and sibling_list should be mutually exclusive;
         * either you're a sibling on a group, or you're the group leader.
         * Rework the code to always use the same list element.
         *
         * Locked for modification by both ctx->mutex and ctx->lock; holding
         * either sufficies for read.
         */
        struct list_head                group_entry;
        /*
         * entry onto perf_event_context::event_list;
         *   modifications require ctx->lock
         *   RCU safe iterations.
         */
        struct list_head                event_entry;
        struct list_head                sibling_list;
        struct hlist_node               hlist_entry;
        int                             nr_siblings;

        /* Not serialized. Only written during event initialization. */
        RH_KABI_RENAME(int group_flags, int event_caps);

        struct perf_event               *group_leader;
        struct pmu                      *pmu;

        enum perf_event_active_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;
        RH_KABI_DEPRECATE(u64,          tstamp_enabled)
        RH_KABI_DEPRECATE(u64,          tstamp_running)
        RH_KABI_REPLACE(u64             tstamp_stopped,
                        u64             tstamp)

        /*
         * timestamp shadows the actual context timing but it can
         * be safely used in NMI interrupt context. It reflects the
         * context time as it was when the event was last scheduled in.
         *
         * ctx_time already accounts for ctx->timestamp. Therefore to
         * compute ctx_time for a sample, simply add perf_clock().
         */
        u64                             shadow_ctx_time;

        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 ring_buffer              *rb;
        struct list_head                rb_entry;

        /* 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;
        struct irq_work                 pending;

        atomic_t                        event_limit;

        void (*destroy)(struct perf_event *);
        struct rcu_head                 rcu_head;

        struct pid_namespace            *ns;
        u64                             id;

        perf_overflow_handler_t         overflow_handler;
        void                            *overflow_handler_context;

#ifdef CONFIG_EVENT_TRACING
        struct ftrace_event_call        *tp_event;
        struct event_filter             *filter;
#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_X86_64)
        struct ftrace_ops               ftrace_ops;
#endif
#endif

#ifdef CONFIG_CGROUP_PERF
        struct perf_cgroup              *cgrp; /* cgroup event is attach to */
        RH_KABI_DEPRECATE(int,           cgrp_defer_enabled)
#endif

        /*
         * 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.
         */
        RH_KABI_EXTEND(struct list_head         migrate_entry)
        RH_KABI_EXTEND(struct list_head         active_entry)
        RH_KABI_EXTEND(void                     *pmu_private)
#if defined(CONFIG_FUNCTION_TRACER) && !defined(CONFIG_X86_64)
        RH_KABI_EXTEND(struct ftrace_ops         ftrace_ops)
#endif
        /* address range filters */
        RH_KABI_EXTEND(struct perf_addr_filters_head     addr_filters)
        /* vma address array for file-based filders */
        RH_KABI_EXTEND(unsigned long                    *addr_filters_offs)
        RH_KABI_EXTEND(unsigned long                     addr_filters_gen)
        RH_KABI_EXTEND(struct list_head                  sb_list)
        RH_KABI_EXTEND(u64                              (*clock)(void))
        /* The cumulative AND of all event_caps for events in this group. */
        RH_KABI_EXTEND(int                              group_caps)
        /*
         * Node on the pinned or flexible tree located at the event context;
         */
        RH_KABI_EXTEND(struct rb_node                   group_node)
        RH_KABI_EXTEND(u64                              group_index)
        RH_KABI_EXTEND(struct list_head                 active_list)

#ifdef CONFIG_BPF_SYSCALL
        RH_KABI_EXTEND(perf_overflow_handler_t          orig_overflow_handler)
        RH_KABI_EXTEND(struct bpf_prog                  *prog)
#endif
#endif /* CONFIG_PERF_EVENTS */
};

enum perf_event_context_type {
        task_context,
        cpu_context,
};

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;
        RH_KABI_DEPRECATE(enum perf_event_context_type, type)
        /*
         * 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;

        RH_KABI_DEPRECATE(struct list_head, pinned_groups)
        RH_KABI_DEPRECATE(struct list_head, flexible_groups)
        struct list_head                event_list;

        int                             nr_events;
        int                             nr_active;
        int                             is_active;
        int                             nr_stat;
        int                             nr_freq;
        int                             rotate_disable;
        atomic_t                        refcount;
        struct task_struct              *task;

        /*
         * Context clock, runs when context enabled.
         */
        u64                             time;
        u64                             timestamp;

        /*
         * 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;
        int                             nr_cgroups;      /* cgroup evts */
        RH_KABI_DEPRECATE(int, nr_branch_stack)
        struct rcu_head                 rcu_head;
        RH_KABI_EXTEND(struct list_head         active_ctx_list)
        RH_KABI_EXTEND(void                     *task_ctx_data) /* pmu specific data */
        RH_KABI_EXTEND(struct perf_event_groups pinned_groups)
        RH_KABI_EXTEND(struct perf_event_groups flexible_groups)
        RH_KABI_EXTEND(struct list_head         pinned_active)
        RH_KABI_EXTEND(struct list_head         flexible_active)
};

/*
 * Number of contexts where an event can trigger:
 *      task, softirq, hardirq, nmi.
 */
#define PERF_NR_CONTEXTS        4

/**
 * struct perf_event_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;
        struct hrtimer                  hrtimer;
        ktime_t                         hrtimer_interval;

        RH_KABI_DEPRECATE(struct list_head,     rotation_list)

        struct pmu                      *unique_pmu;
        struct perf_cgroup              *cgrp;

        RH_KABI_EXTEND(raw_spinlock_t   hrtimer_lock)
        RH_KABI_EXTEND(unsigned int     hrtimer_active)
};

struct perf_output_handle {
        struct perf_event               *event;
        struct ring_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

#ifndef __GENKSYMS__
/*
 * 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;
};

struct perf_cgroup {
        struct cgroup_subsys_state      css;
        struct perf_cgroup_info __percpu *info;
};
#endif /* __GENKSYMS__ */

/*
 * 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)
{
        return container_of(task_subsys_state(task, perf_subsys_id),
                            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 int perf_num_counters(void);
extern const char *perf_pmu_name(void);
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);
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_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 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_regs_user {
        __u64           abi;
        struct pt_regs  *regs;
};

struct perf_sample_data {
        u64                             type;

        u64                             ip;
        struct {
                u32     pid;
                u32     tid;
        }                               tid_entry;
        u64                             time;
        u64                             addr;
        u64                             id;
        u64                             stream_id;
        struct {
                u32     cpu;
                u32     reserved;
        }                               cpu_entry;
        u64                             period;
        union  perf_mem_data_src        data_src;
        struct perf_callchain_entry     *callchain;
        struct perf_raw_record          *raw;
        struct perf_branch_stack        *br_stack;

        RH_KABI_REPLACE(struct perf_regs_user       regs_user,
                            struct perf_regs            regs_user)

        u64                             stack_user_size;
        u64                             weight;

        /*
         * Transaction flags for abort events:
         */
        RH_KABI_EXTEND(u64                              txn)
        RH_KABI_EXTEND(struct perf_regs                 regs_intr)

        /*
         * regs_user may point to task_pt_regs or to regs_user_copy, depending
         * on arch details.
         */
        RH_KABI_EXTEND(struct pt_regs                   regs_user_copy)

        RH_KABI_EXTEND(u64                              phys_addr)

} ____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 = 0;
        data->data_src.val = PERF_MEM_NA;
        data->txn = 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 void 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 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;
}

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

/*
 * Take a snapshot of the regs. Skip ip and frame pointer to
 * the nth caller. We only need a few of the regs:
 * - ip for PERF_SAMPLE_IP
 * - cs for user_mode() tests
 * - bp for callchains
 * - eflags, for future purposes, just in case
 */
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)
{
        if (static_key_false(&perf_swevent_enabled[event_id])) {
                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_deferred perf_sched_events;

static inline void perf_event_task_sched_in(struct task_struct *prev,
                                            struct task_struct *task)
{
        if (static_key_false(&perf_sched_events.key))
                __perf_event_task_sched_in(prev, task);
}

static inline void perf_event_task_sched_out(struct task_struct *prev,
                                             struct task_struct *next)
{
        perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);

        if (static_key_false(&perf_sched_events.key))
                __perf_event_task_sched_out(prev, next);
}

extern void perf_event_mmap(struct vm_area_struct *vma);
extern struct perf_guest_info_callbacks *perf_guest_cbs;
extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);

extern void perf_event_exec(void);
extern void perf_event_comm(struct task_struct *tsk, bool exec);
extern void perf_event_fork(struct task_struct *tsk);

/* Callchains */
DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);

extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
extern struct perf_callchain_entry *
get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
                   bool crosstask, bool add_mark);
extern int get_callchain_buffers(void);
extern void put_callchain_buffers(void);

static inline int perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
{
        if (entry->nr < PERF_MAX_STACK_DEPTH) {
                entry->ip[entry->nr++] = ip;
                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);

extern int perf_proc_update_handler(struct ctl_table *table, int write,
                void __user *buffer, size_t *lenp,
                loff_t *ppos);
extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
                void __user *buffer, size_t *lenp,
                loff_t *ppos);


static inline bool perf_paranoid_tracepoint_raw(void)
{
        return sysctl_perf_event_paranoid > -1;
}

static inline bool perf_paranoid_cpu(void)
{
        return sysctl_perf_event_paranoid > 0;
}

static inline bool perf_paranoid_kernel(void)
{
        return sysctl_perf_event_paranoid > 1;
}

extern void perf_event_init(void);
extern void perf_tp_event(u64 addr, 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 int perf_output_begin(struct perf_output_handle *handle,
                             struct perf_event *event, unsigned int size);
extern int perf_output_begin_forward(struct perf_output_handle *handle,
                                    struct perf_event *event,
                                    unsigned int size);
extern int perf_output_begin_backward(struct perf_output_handle *handle,
                                      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 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);
#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_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)       { 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_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_sw_event_sched(u32 event_id, u64 nr, u64 addr)                     { }
static inline void
perf_bp_event(struct perf_event *event, void *data)                     { }

static inline int perf_register_guest_info_callbacks
(struct perf_guest_info_callbacks *callbacks)                           { return 0; }
static inline int perf_unregister_guest_info_callbacks
(struct perf_guest_info_callbacks *callbacks)                           { return 0; }

static inline void perf_event_mmap(struct vm_area_struct *vma)          { }
static inline void perf_event_exec(void)                                { }
static inline void perf_event_comm(struct task_struct *tsk, bool exec)  { }
static inline void perf_event_fork(struct task_struct *tsk)             { }
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; }
#endif

#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
extern bool perf_event_can_stop_tick(void);
#else
static inline bool perf_event_can_stop_tick(void)                       { return true; }
#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))

/*
 * This has to have a higher priority than migration_notifier in sched.c.
 */
#define perf_cpu_notifier(fn)                                           \
do {                                                                    \
        static struct notifier_block fn##_nb =                          \
                { .notifier_call = fn, .priority = CPU_PRI_PERF };      \
        unsigned long cpu = smp_processor_id();                         \
        unsigned long flags;                                            \
                                                                        \
        cpu_notifier_register_begin();                                  \
        fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,                     \
                (void *)(unsigned long)cpu);                            \
        local_irq_save(flags);                                          \
        fn(&fn##_nb, (unsigned long)CPU_STARTING,                       \
                (void *)(unsigned long)cpu);                            \
        local_irq_restore(flags);                                       \
        fn(&fn##_nb, (unsigned long)CPU_ONLINE,                         \
                (void *)(unsigned long)cpu);                            \
        __register_cpu_notifier(&fn##_nb);                              \
        cpu_notifier_register_done();                                   \
} while (0)

/*
 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
 * callback for already online CPUs.
 */
#define __perf_cpu_notifier(fn)                                         \
do {                                                                    \
        static struct notifier_block fn##_nb =                          \
                { .notifier_call = fn, .priority = CPU_PRI_PERF };      \
                                                                        \
        __register_cpu_notifier(&fn##_nb);                              \
} while (0)

struct perf_pmu_events_attr {
        struct device_attribute attr;
        u64 id;
        const char *event_str;
};

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_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)

#endif /* _LINUX_PERF_EVENT_H */