--- /dev/null
+/*
+ * Performance events:
+ *
+ * Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
+ * Copyright (C) 2008-2009, Red Hat, Inc., Ingo Molnar
+ * Copyright (C) 2008-2009, 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 <linux/types.h>
+#include <linux/ioctl.h>
+#include <asm/byteorder.h>
+
+/*
+ * User-space ABI bits:
+ */
+
+/*
+ * attr.type
+ */
+enum perf_type_id {
+ PERF_TYPE_HARDWARE = 0,
+ PERF_TYPE_SOFTWARE = 1,
+ PERF_TYPE_TRACEPOINT = 2,
+ PERF_TYPE_HW_CACHE = 3,
+ PERF_TYPE_RAW = 4,
+ PERF_TYPE_BREAKPOINT = 5,
+
+ PERF_TYPE_MAX, /* non-ABI */
+};
+
+/*
+ * Generalized performance event event_id types, used by the
+ * attr.event_id parameter of the sys_perf_event_open()
+ * syscall:
+ */
+enum perf_hw_id {
+ /*
+ * Common hardware events, generalized by the kernel:
+ */
+ PERF_COUNT_HW_CPU_CYCLES = 0,
+ PERF_COUNT_HW_INSTRUCTIONS = 1,
+ PERF_COUNT_HW_CACHE_REFERENCES = 2,
+ PERF_COUNT_HW_CACHE_MISSES = 3,
+ PERF_COUNT_HW_BRANCH_INSTRUCTIONS = 4,
+ PERF_COUNT_HW_BRANCH_MISSES = 5,
+ PERF_COUNT_HW_BUS_CYCLES = 6,
+
+ PERF_COUNT_HW_MAX, /* non-ABI */
+};
+
+/*
+ * Generalized hardware cache events:
+ *
+ * { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
+ * { read, write, prefetch } x
+ * { accesses, misses }
+ */
+enum perf_hw_cache_id {
+ PERF_COUNT_HW_CACHE_L1D = 0,
+ PERF_COUNT_HW_CACHE_L1I = 1,
+ PERF_COUNT_HW_CACHE_LL = 2,
+ PERF_COUNT_HW_CACHE_DTLB = 3,
+ PERF_COUNT_HW_CACHE_ITLB = 4,
+ PERF_COUNT_HW_CACHE_BPU = 5,
+
+ PERF_COUNT_HW_CACHE_MAX, /* non-ABI */
+};
+
+enum perf_hw_cache_op_id {
+ PERF_COUNT_HW_CACHE_OP_READ = 0,
+ PERF_COUNT_HW_CACHE_OP_WRITE = 1,
+ PERF_COUNT_HW_CACHE_OP_PREFETCH = 2,
+
+ PERF_COUNT_HW_CACHE_OP_MAX, /* non-ABI */
+};
+
+enum perf_hw_cache_op_result_id {
+ PERF_COUNT_HW_CACHE_RESULT_ACCESS = 0,
+ PERF_COUNT_HW_CACHE_RESULT_MISS = 1,
+
+ PERF_COUNT_HW_CACHE_RESULT_MAX, /* non-ABI */
+};
+
+/*
+ * Special "software" events provided by the kernel, even if the hardware
+ * does not support performance events. These events measure various
+ * physical and sw events of the kernel (and allow the profiling of them as
+ * well):
+ */
+enum perf_sw_ids {
+ PERF_COUNT_SW_CPU_CLOCK = 0,
+ PERF_COUNT_SW_TASK_CLOCK = 1,
+ PERF_COUNT_SW_PAGE_FAULTS = 2,
+ PERF_COUNT_SW_CONTEXT_SWITCHES = 3,
+ PERF_COUNT_SW_CPU_MIGRATIONS = 4,
+ PERF_COUNT_SW_PAGE_FAULTS_MIN = 5,
+ PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
+ PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
+ PERF_COUNT_SW_EMULATION_FAULTS = 8,
+
+ PERF_COUNT_SW_MAX, /* non-ABI */
+};
+
+/*
+ * Bits that can be set in attr.sample_type to request information
+ * in the overflow packets.
+ */
+enum perf_event_sample_format {
+ PERF_SAMPLE_IP = 1U << 0,
+ PERF_SAMPLE_TID = 1U << 1,
+ PERF_SAMPLE_TIME = 1U << 2,
+ PERF_SAMPLE_ADDR = 1U << 3,
+ PERF_SAMPLE_READ = 1U << 4,
+ PERF_SAMPLE_CALLCHAIN = 1U << 5,
+ PERF_SAMPLE_ID = 1U << 6,
+ PERF_SAMPLE_CPU = 1U << 7,
+ PERF_SAMPLE_PERIOD = 1U << 8,
+ PERF_SAMPLE_STREAM_ID = 1U << 9,
+ PERF_SAMPLE_RAW = 1U << 10,
+
+ PERF_SAMPLE_MAX = 1U << 11, /* non-ABI */
+};
+
+/*
+ * The format of the data returned by read() on a perf event fd,
+ * as specified by attr.read_format:
+ *
+ * struct read_format {
+ * { u64 value;
+ * { u64 time_enabled; } && PERF_FORMAT_ENABLED
+ * { u64 time_running; } && PERF_FORMAT_RUNNING
+ * { u64 id; } && PERF_FORMAT_ID
+ * } && !PERF_FORMAT_GROUP
+ *
+ * { u64 nr;
+ * { u64 time_enabled; } && PERF_FORMAT_ENABLED
+ * { u64 time_running; } && PERF_FORMAT_RUNNING
+ * { u64 value;
+ * { u64 id; } && PERF_FORMAT_ID
+ * } cntr[nr];
+ * } && PERF_FORMAT_GROUP
+ * };
+ */
+enum perf_event_read_format {
+ PERF_FORMAT_TOTAL_TIME_ENABLED = 1U << 0,
+ PERF_FORMAT_TOTAL_TIME_RUNNING = 1U << 1,
+ PERF_FORMAT_ID = 1U << 2,
+ PERF_FORMAT_GROUP = 1U << 3,
+
+ PERF_FORMAT_MAX = 1U << 4, /* non-ABI */
+};
+
+#define PERF_ATTR_SIZE_VER0 64 /* sizeof first published struct */
+
+/*
+ * Hardware event_id to monitor via a performance monitoring event:
+ */
+struct perf_event_attr {
+
+ /*
+ * Major type: hardware/software/tracepoint/etc.
+ */
+ __u32 type;
+
+ /*
+ * Size of the attr structure, for fwd/bwd compat.
+ */
+ __u32 size;
+
+ /*
+ * Type specific configuration information.
+ */
+ __u64 config;
+
+ union {
+ __u64 sample_period;
+ __u64 sample_freq;
+ };
+
+ __u64 sample_type;
+ __u64 read_format;
+
+ __u64 disabled : 1, /* off by default */
+ inherit : 1, /* children inherit it */
+ pinned : 1, /* must always be on PMU */
+ exclusive : 1, /* only group on PMU */
+ exclude_user : 1, /* don't count user */
+ exclude_kernel : 1, /* ditto kernel */
+ exclude_hv : 1, /* ditto hypervisor */
+ exclude_idle : 1, /* don't count when idle */
+ mmap : 1, /* include mmap data */
+ comm : 1, /* include comm data */
+ freq : 1, /* use freq, not period */
+ inherit_stat : 1, /* per task counts */
+ enable_on_exec : 1, /* next exec enables */
+ task : 1, /* trace fork/exit */
+ watermark : 1, /* wakeup_watermark */
+ /*
+ * precise_ip:
+ *
+ * 0 - SAMPLE_IP can have arbitrary skid
+ * 1 - SAMPLE_IP must have constant skid
+ * 2 - SAMPLE_IP requested to have 0 skid
+ * 3 - SAMPLE_IP must have 0 skid
+ *
+ * See also PERF_RECORD_MISC_EXACT_IP
+ */
+ precise_ip : 2, /* skid constraint */
+ mmap_data : 1, /* non-exec mmap data */
+
+ __reserved_1 : 46;
+
+ union {
+ __u32 wakeup_events; /* wakeup every n events */
+ __u32 wakeup_watermark; /* bytes before wakeup */
+ };
+
+ __u32 bp_type;
+ __u64 bp_addr;
+ __u64 bp_len;
+};
+
+/*
+ * Ioctls that can be done on a perf event fd:
+ */
+#define PERF_EVENT_IOC_ENABLE _IO ('$', 0)
+#define PERF_EVENT_IOC_DISABLE _IO ('$', 1)
+#define PERF_EVENT_IOC_REFRESH _IO ('$', 2)
+#define PERF_EVENT_IOC_RESET _IO ('$', 3)
+#define PERF_EVENT_IOC_PERIOD _IOW('$', 4, __u64)
+#define PERF_EVENT_IOC_SET_OUTPUT _IO ('$', 5)
+#define PERF_EVENT_IOC_SET_FILTER _IOW('$', 6, char *)
+
+enum perf_event_ioc_flags {
+ PERF_IOC_FLAG_GROUP = 1U << 0,
+};
+
+/*
+ * Structure of the page that can be mapped via mmap
+ */
+struct perf_event_mmap_page {
+ __u32 version; /* version number of this structure */
+ __u32 compat_version; /* lowest version this is compat with */
+
+ /*
+ * Bits needed to read the hw events in user-space.
+ *
+ * u32 seq;
+ * s64 count;
+ *
+ * do {
+ * seq = pc->lock;
+ *
+ * barrier()
+ * if (pc->index) {
+ * count = pmc_read(pc->index - 1);
+ * count += pc->offset;
+ * } else
+ * goto regular_read;
+ *
+ * barrier();
+ * } while (pc->lock != seq);
+ *
+ * NOTE: for obvious reason this only works on self-monitoring
+ * processes.
+ */
+ __u32 lock; /* seqlock for synchronization */
+ __u32 index; /* hardware event identifier */
+ __s64 offset; /* add to hardware event value */
+ __u64 time_enabled; /* time event active */
+ __u64 time_running; /* time event on cpu */
+
+ /*
+ * Hole for extension of the self monitor capabilities
+ */
+
+ __u64 __reserved[123]; /* align to 1k */
+
+ /*
+ * Control data for the mmap() data buffer.
+ *
+ * User-space reading the @data_head value should issue an rmb(), on
+ * SMP capable platforms, after reading this value -- see
+ * perf_event_wakeup().
+ *
+ * When the mapping is PROT_WRITE the @data_tail value should be
+ * written by userspace to reflect the last read data. In this case
+ * the kernel will not over-write unread data.
+ */
+ __u64 data_head; /* head in the data section */
+ __u64 data_tail; /* user-space written tail */
+};
+
+#define PERF_RECORD_MISC_CPUMODE_MASK (7 << 0)
+#define PERF_RECORD_MISC_CPUMODE_UNKNOWN (0 << 0)
+#define PERF_RECORD_MISC_KERNEL (1 << 0)
+#define PERF_RECORD_MISC_USER (2 << 0)
+#define PERF_RECORD_MISC_HYPERVISOR (3 << 0)
+#define PERF_RECORD_MISC_GUEST_KERNEL (4 << 0)
+#define PERF_RECORD_MISC_GUEST_USER (5 << 0)
+
+/*
+ * Indicates that the content of PERF_SAMPLE_IP points to
+ * the actual instruction that triggered the event. See also
+ * perf_event_attr::precise_ip.
+ */
+#define PERF_RECORD_MISC_EXACT_IP (1 << 14)
+/*
+ * Reserve the last bit to indicate some extended misc field
+ */
+#define PERF_RECORD_MISC_EXT_RESERVED (1 << 15)
+
+struct perf_event_header {
+ __u32 type;
+ __u16 misc;
+ __u16 size;
+};
+
+enum perf_event_type {
+
+ /*
+ * The MMAP events record the PROT_EXEC mappings so that we can
+ * correlate userspace IPs to code. They have the following structure:
+ *
+ * struct {
+ * struct perf_event_header header;
+ *
+ * u32 pid, tid;
+ * u64 addr;
+ * u64 len;
+ * u64 pgoff;
+ * char filename[];
+ * };
+ */
+ PERF_RECORD_MMAP = 1,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ * u64 id;
+ * u64 lost;
+ * };
+ */
+ PERF_RECORD_LOST = 2,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ *
+ * u32 pid, tid;
+ * char comm[];
+ * };
+ */
+ PERF_RECORD_COMM = 3,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ * u32 pid, ppid;
+ * u32 tid, ptid;
+ * u64 time;
+ * };
+ */
+ PERF_RECORD_EXIT = 4,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ * u64 time;
+ * u64 id;
+ * u64 stream_id;
+ * };
+ */
+ PERF_RECORD_THROTTLE = 5,
+ PERF_RECORD_UNTHROTTLE = 6,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ * u32 pid, ppid;
+ * u32 tid, ptid;
+ * u64 time;
+ * };
+ */
+ PERF_RECORD_FORK = 7,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ * u32 pid, tid;
+ *
+ * struct read_format values;
+ * };
+ */
+ PERF_RECORD_READ = 8,
+
+ /*
+ * struct {
+ * struct perf_event_header header;
+ *
+ * { u64 ip; } && PERF_SAMPLE_IP
+ * { u32 pid, tid; } && PERF_SAMPLE_TID
+ * { u64 time; } && PERF_SAMPLE_TIME
+ * { u64 addr; } && PERF_SAMPLE_ADDR
+ * { u64 id; } && PERF_SAMPLE_ID
+ * { u64 stream_id;} && PERF_SAMPLE_STREAM_ID
+ * { u32 cpu, res; } && PERF_SAMPLE_CPU
+ * { u64 period; } && PERF_SAMPLE_PERIOD
+ *
+ * { struct read_format values; } && PERF_SAMPLE_READ
+ *
+ * { u64 nr,
+ * u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN
+ *
+ * #
+ * # The RAW record below is opaque data wrt the ABI
+ * #
+ * # That is, the ABI doesn't make any promises wrt to
+ * # the stability of its content, it may vary depending
+ * # on event, hardware, kernel version and phase of
+ * # the moon.
+ * #
+ * # In other words, PERF_SAMPLE_RAW contents are not an ABI.
+ * #
+ *
+ * { u32 size;
+ * char data[size];}&& PERF_SAMPLE_RAW
+ * };
+ */
+ PERF_RECORD_SAMPLE = 9,
+
+ PERF_RECORD_MAX, /* non-ABI */
+};
+
+enum perf_callchain_context {
+ PERF_CONTEXT_HV = (__u64)-32,
+ PERF_CONTEXT_KERNEL = (__u64)-128,
+ PERF_CONTEXT_USER = (__u64)-512,
+
+ PERF_CONTEXT_GUEST = (__u64)-2048,
+ PERF_CONTEXT_GUEST_KERNEL = (__u64)-2176,
+ PERF_CONTEXT_GUEST_USER = (__u64)-2560,
+
+ PERF_CONTEXT_MAX = (__u64)-4095,
+};
+
+#define PERF_FLAG_FD_NO_GROUP (1U << 0)
+#define PERF_FLAG_FD_OUTPUT (1U << 1)
+
+#ifdef __KERNEL__
+/*
+ * 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/jump_label_ref.h>
+#include <asm/atomic.h>
+#include <asm/local.h>
+
+#define PERF_MAX_STACK_DEPTH 255
+
+struct perf_callchain_entry {
+ __u64 nr;
+ __u64 ip[PERF_MAX_STACK_DEPTH];
+};
+
+struct perf_raw_record {
+ u32 size;
+ void *data;
+};
+
+struct perf_branch_entry {
+ __u64 from;
+ __u64 to;
+ __u64 flags;
+};
+
+struct perf_branch_stack {
+ __u64 nr;
+ struct perf_branch_entry entries[0];
+};
+
+struct task_struct;
+
+/**
+ * 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 idx;
+ int last_cpu;
+ };
+ struct { /* software */
+ struct hrtimer hrtimer;
+ };
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+ struct { /* breakpoint */
+ struct arch_hw_breakpoint info;
+ struct list_head bp_list;
+ /*
+ * Crufty hack to avoid the chicken and egg
+ * problem hw_breakpoint has with context
+ * creation and event initalization.
+ */
+ struct task_struct *bp_target;
+ };
+#endif
+ };
+ int state;
+ local64_t prev_count;
+ u64 sample_period;
+ u64 last_period;
+ local64_t period_left;
+ u64 interrupts;
+
+ u64 freq_time_stamp;
+ u64 freq_count_stamp;
+#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_EVENT_TXN 0x1
+
+/**
+ * struct pmu - generic performance monitoring unit
+ */
+struct pmu {
+ struct list_head entry;
+
+ int * __percpu pmu_disable_count;
+ struct perf_cpu_context * __percpu pmu_cpu_context;
+ int task_ctx_nr;
+
+ /*
+ * 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.
+ */
+ void (*start_txn) (struct pmu *pmu); /* optional */
+ /*
+ * 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.
+ */
+ int (*commit_txn) (struct pmu *pmu); /* optional */
+ /*
+ * Will cancel the transaction, assumes ->del() is called
+ * for each successfull ->add() during the transaction.
+ */
+ void (*cancel_txn) (struct pmu *pmu); /* optional */
+};
+
+/**
+ * enum perf_event_active_state - the states of a event
+ */
+enum perf_event_active_state {
+ PERF_EVENT_STATE_ERROR = -2,
+ PERF_EVENT_STATE_OFF = -1,
+ PERF_EVENT_STATE_INACTIVE = 0,
+ PERF_EVENT_STATE_ACTIVE = 1,
+};
+
+struct file;
+
+#define PERF_BUFFER_WRITABLE 0x01
+
+struct perf_buffer {
+ atomic_t refcount;
+ struct rcu_head rcu_head;
+#ifdef CONFIG_PERF_USE_VMALLOC
+ struct work_struct work;
+ int page_order; /* allocation order */
+#endif
+ int nr_pages; /* nr of data pages */
+ int writable; /* are we writable */
+
+ atomic_t poll; /* POLL_ for wakeups */
+
+ local_t head; /* write position */
+ local_t nest; /* nested writers */
+ local_t events; /* event limit */
+ local_t wakeup; /* wakeup stamp */
+ local_t lost; /* nr records lost */
+
+ long watermark; /* wakeup watermark */
+
+ struct perf_event_mmap_page *user_page;
+ void *data_pages[0];
+};
+
+struct perf_sample_data;
+
+typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
+ struct perf_sample_data *,
+ struct pt_regs *regs);
+
+enum perf_group_flag {
+ PERF_GROUP_SOFTWARE = 0x1,
+};
+
+#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
+
+/**
+ * struct perf_event - performance event kernel representation:
+ */
+struct perf_event {
+#ifdef CONFIG_PERF_EVENTS
+ struct list_head group_entry;
+ struct list_head event_entry;
+ struct list_head sibling_list;
+ struct hlist_node hlist_entry;
+ int nr_siblings;
+ int group_flags;
+ 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.
+ *
+ * They are computed from tstamp_enabled, tstamp_running and
+ * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
+ */
+ u64 total_time_enabled;
+ u64 total_time_running;
+
+ /*
+ * These are timestamps used for computing total_time_enabled
+ * and total_time_running when the event is in INACTIVE or
+ * ACTIVE state, measured in nanoseconds from an arbitrary point
+ * in time.
+ * tstamp_enabled: the notional time when the event was enabled
+ * tstamp_running: the notional time when the event was scheduled on
+ * tstamp_stopped: in INACTIVE state, the notional time when the
+ * event was scheduled off.
+ */
+ u64 tstamp_enabled;
+ u64 tstamp_running;
+ u64 tstamp_stopped;
+
+ struct perf_event_attr attr;
+ struct hw_perf_event hw;
+
+ struct perf_event_context *ctx;
+ struct file *filp;
+
+ /*
+ * 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;
+ int mmap_locked;
+ struct user_struct *mmap_user;
+ struct perf_buffer *buffer;
+
+ /* 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;
+
+#ifdef CONFIG_EVENT_TRACING
+ struct ftrace_event_call *tp_event;
+ struct event_filter *filter;
+#endif
+
+#endif /* CONFIG_PERF_EVENTS */
+};
+
+enum perf_event_context_type {
+ task_context,
+ cpu_context,
+};
+
+/**
+ * struct perf_event_context - event context structure
+ *
+ * Used as a container for task events and CPU events as well:
+ */
+struct perf_event_context {
+ enum perf_event_context_type type;
+ 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 pinned_groups;
+ struct list_head flexible_groups;
+ struct list_head event_list;
+ int nr_events;
+ int nr_active;
+ int is_active;
+ int nr_stat;
+ 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;
+ 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;
+ struct list_head rotation_list;
+ int jiffies_interval;
+};
+
+struct perf_output_handle {
+ struct perf_event *event;
+ struct perf_buffer *buffer;
+ unsigned long wakeup;
+ unsigned long size;
+ void *addr;
+ int page;
+ int nmi;
+ int sample;
+};
+
+#ifdef CONFIG_PERF_EVENTS
+
+extern int perf_pmu_register(struct pmu *pmu);
+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 *task);
+extern void __perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
+
+extern atomic_t perf_task_events;
+
+static inline void perf_event_task_sched_in(struct task_struct *task)
+{
+ COND_STMT(&perf_task_events, __perf_event_task_sched_in(task));
+}
+
+static inline
+void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next)
+{
+ COND_STMT(&perf_task_events, __perf_event_task_sched_out(task, 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 void perf_event_print_debug(void);
+extern void perf_pmu_disable(struct pmu *pmu);
+extern void perf_pmu_enable(struct pmu *pmu);
+extern int perf_event_task_disable(void);
+extern int perf_event_task_enable(void);
+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);
+extern u64 perf_event_read_value(struct perf_event *event,
+ u64 *enabled, u64 *running);
+
+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;
+ struct perf_callchain_entry *callchain;
+ struct perf_raw_record *raw;
+};
+
+static inline
+void perf_sample_data_init(struct perf_sample_data *data, u64 addr)
+{
+ data->addr = addr;
+ data->raw = NULL;
+}
+
+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, int nmi,
+ struct perf_sample_data *data,
+ struct pt_regs *regs);
+
+/*
+ * Return 1 for a software event, 0 for a hardware event
+ */
+static inline int is_software_event(struct perf_event *event)
+{
+ return event->pmu->task_ctx_nr == perf_sw_context;
+}
+
+extern atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX];
+
+extern void __perf_sw_event(u32, u64, int, 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)
+{
+ memset(regs, 0, sizeof(*regs));
+
+ perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
+}
+
+static __always_inline void
+perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
+{
+ struct pt_regs hot_regs;
+
+ JUMP_LABEL(&perf_swevent_enabled[event_id], have_event);
+ return;
+
+have_event:
+ if (!regs) {
+ perf_fetch_caller_regs(&hot_regs);
+ regs = &hot_regs;
+ }
+ __perf_sw_event(event_id, nr, nmi, regs, addr);
+}
+
+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_comm(struct task_struct *tsk);
+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);
+
+
+static inline void
+perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
+{
+ if (entry->nr < PERF_MAX_STACK_DEPTH)
+ entry->ip[entry->nr++] = ip;
+}
+
+extern int sysctl_perf_event_paranoid;
+extern int sysctl_perf_event_mlock;
+extern int sysctl_perf_event_sample_rate;
+
+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);
+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
+
+extern int perf_output_begin(struct perf_output_handle *handle,
+ struct perf_event *event, unsigned int size,
+ int nmi, int sample);
+extern void perf_output_end(struct perf_output_handle *handle);
+extern void perf_output_copy(struct perf_output_handle *handle,
+ const void *buf, unsigned int len);
+extern int perf_swevent_get_recursion_context(void);
+extern void perf_swevent_put_recursion_context(int rctx);
+extern void perf_event_enable(struct perf_event *event);
+extern void perf_event_disable(struct perf_event *event);
+extern void perf_event_task_tick(void);
+#else
+static inline void
+perf_event_task_sched_in(struct task_struct *task) { }
+static inline void
+perf_event_task_sched_out(struct task_struct *task,
+ 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 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 void
+perf_sw_event(u32 event_id, u64 nr, int nmi,
+ struct pt_regs *regs, 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_comm(struct task_struct *tsk) { }
+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 void perf_event_enable(struct perf_event *event) { }
+static inline void perf_event_disable(struct perf_event *event) { }
+static inline void perf_event_task_tick(void) { }
+#endif
+
+#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 __cpuinitdata = \
+ { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
+ fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
+ (void *)(unsigned long)smp_processor_id()); \
+ fn(&fn##_nb, (unsigned long)CPU_STARTING, \
+ (void *)(unsigned long)smp_processor_id()); \
+ fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
+ (void *)(unsigned long)smp_processor_id()); \
+ register_cpu_notifier(&fn##_nb); \
+} while (0)
+
+#endif /* __KERNEL__ */
+#endif /* _LINUX_PERF_EVENT_H */
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