v4.19.13 snapshot.
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
new file mode 100644
index 0000000..53c500f
--- /dev/null
+++ b/include/linux/perf_event.h
@@ -0,0 +1,1414 @@
+/*
+ * 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>
+#include <linux/cgroup.h>
+#include <asm/local.h>
+
+struct perf_callchain_entry {
+ __u64 nr;
+ __u64 ip[0]; /* /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[]
+ *
+ * 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 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;
+
+ /*
+ * 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;
+
+ /*
+ * 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_AUX_SW_DOUBLEBUF 0x08
+#define PERF_PMU_CAP_EXCLUSIVE 0x10
+#define PERF_PMU_CAP_ITRACE 0x20
+#define PERF_PMU_CAP_HETEROGENEOUS_CPUS 0x40
+
+/**
+ * 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 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
+ * -EACCESS -- @event is for this PMU, @event is valid, but no privilidges
+ *
+ * 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 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);
+ /*
+ * PMU specific data size
+ */
+ size_t task_ctx_size;
+
+
+ /*
+ * Set up pmu-private data structures for an AUX area
+ */
+ void *(*setup_aux) (int cpu, void **pages,
+ int nr_pages, bool overwrite);
+ /* optional */
+
+ /*
+ * Free pmu-private AUX data structures
+ */
+ void (*free_aux) (void *aux); /* optional */
+
+ /*
+ * 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 */
+
+ /*
+ * Filter events for PMU-specific reasons.
+ */
+ int (*filter_match) (struct perf_event *event); /* 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
+ * @inode: object file's inode 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;
+};
+
+/**
+ * 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.
+ */
+#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;
+};
+
+#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.
+ *
+ * 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;
+ 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 */
+ unsigned long *addr_filters_offs;
+ unsigned long addr_filters_gen;
+
+ 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
+
+ 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;
+ 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;
+#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;
+};
+
+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
+
+/*
+ * 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 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;
+
+ /*
+ * regs_user may point to task_pt_regs or to regs_user_copy, depending
+ * on arch details.
+ */
+ struct perf_regs regs_user;
+ struct pt_regs regs_user_copy;
+
+ struct perf_regs regs_intr;
+ u64 stack_user_size;
+
+ 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;
+}
+
+/*
+ * 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;
+}
+
+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_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 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_namespaces(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_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 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);
+
+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);
+
+int perf_event_max_stack_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(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_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_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) { }
+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_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_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
+
+#endif /* _LINUX_PERF_EVENT_H */