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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
- struct perf_guest_info_callbacks {
- int (*is_in_guest)(void);
- int (*is_user_mode)(void);
- unsigned long (*get_guest_ip)(void);
- void (*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 <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[] */
- };
- /**
- * 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 0x01
- #define PERF_PMU_CAP_NO_NMI 0x02
- #define PERF_PMU_CAP_AUX_NO_SG 0x04
- #define PERF_PMU_CAP_EXTENDED_REGS 0x08
- #define PERF_PMU_CAP_EXCLUSIVE 0x10
- #define PERF_PMU_CAP_ITRACE 0x20
- #define PERF_PMU_CAP_HETEROGENEOUS_CPUS 0x40
- #define PERF_PMU_CAP_NO_EXCLUDE 0x80
- #define PERF_PMU_CAP_AUX_OUTPUT 0x100
- 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
- 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;
- /*
- * 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,
- * or when ctx_sched_in failed to schedule the event because we
- * run out of PMC.
- *
- * 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 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;
- 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;
- 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;
- #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 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;
- /*
- * 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_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;
- 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;
- };
- 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 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 *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;
- u64 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;
- } ____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 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)
- {
- 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_false perf_sched_events;
- static __always_inline bool
- perf_sw_migrate_enabled(void)
- {
- if (static_key_false(&perf_swevent_enabled[PERF_COUNT_SW_CPU_MIGRATIONS]))
- return true;
- return false;
- }
- static inline void perf_event_task_migrate(struct task_struct *task)
- {
- if (perf_sw_migrate_enabled())
- 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_migrate_enabled() && task->sched_migrated) {
- struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
- perf_fetch_caller_regs(regs);
- ___perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, regs, 0);
- task->sched_migrated = 0;
- }
- }
- 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_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);
- extern struct perf_guest_info_callbacks __rcu *perf_guest_cbs;
- static inline struct perf_guest_info_callbacks *perf_get_guest_cbs(void)
- {
- /*
- * Callbacks are RCU-protected and must be READ_ONCE to avoid reloading
- * the callbacks between a !NULL check and dereferences, to ensure
- * pending stores/changes to the callback pointers are visible before a
- * non-NULL perf_guest_cbs is visible to readers, and to prevent a
- * module from unloading callbacks while readers are active.
- */
- return rcu_dereference(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_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 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) { 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_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) { }
- 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;
- };
- 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)
- /* 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);
- #endif /* _LINUX_PERF_EVENT_H */
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