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Diffstat (limited to 'include/linux/perf_event.h')
| -rw-r--r-- | include/linux/perf_event.h | 1764 |
1 files changed, 1764 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h new file mode 100644 index 000000000..1578a4de1 --- /dev/null +++ b/include/linux/perf_event.h @@ -0,0 +1,1764 @@ +/* + * Performance events: + * + * Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de> + * Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar + * Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra + * + * Data type definitions, declarations, prototypes. + * + * Started by: Thomas Gleixner and Ingo Molnar + * + * For licencing details see kernel-base/COPYING + */ +#ifndef _LINUX_PERF_EVENT_H +#define _LINUX_PERF_EVENT_H + +#include <uapi/linux/perf_event.h> +#include <uapi/linux/bpf_perf_event.h> + +/* + * Kernel-internal data types and definitions: + */ + +#ifdef CONFIG_PERF_EVENTS +# include <asm/perf_event.h> +# include <asm/local64.h> +#endif + +#define PERF_GUEST_ACTIVE 0x01 +#define PERF_GUEST_USER 0x02 + +struct perf_guest_info_callbacks { + unsigned int (*state)(void); + unsigned long (*get_ip)(void); + unsigned int (*handle_intel_pt_intr)(void); +}; + +#ifdef CONFIG_HAVE_HW_BREAKPOINT +#include <linux/rhashtable-types.h> +#include <asm/hw_breakpoint.h> +#endif + +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/spinlock.h> +#include <linux/hrtimer.h> +#include <linux/fs.h> +#include <linux/pid_namespace.h> +#include <linux/workqueue.h> +#include <linux/ftrace.h> +#include <linux/cpu.h> +#include <linux/irq_work.h> +#include <linux/static_key.h> +#include <linux/jump_label_ratelimit.h> +#include <linux/atomic.h> +#include <linux/sysfs.h> +#include <linux/perf_regs.h> +#include <linux/cgroup.h> +#include <linux/refcount.h> +#include <linux/security.h> +#include <linux/static_call.h> +#include <linux/lockdep.h> +#include <asm/local.h> + +struct perf_callchain_entry { + __u64 nr; + __u64 ip[]; /* /proc/sys/kernel/perf_event_max_stack */ +}; + +struct perf_callchain_entry_ctx { + struct perf_callchain_entry *entry; + u32 max_stack; + u32 nr; + short contexts; + bool contexts_maxed; +}; + +typedef unsigned long (*perf_copy_f)(void *dst, const void *src, + unsigned long off, unsigned long len); + +struct perf_raw_frag { + union { + struct perf_raw_frag *next; + unsigned long pad; + }; + perf_copy_f copy; + void *data; + u32 size; +} __packed; + +struct perf_raw_record { + struct perf_raw_frag frag; + u32 size; +}; + +/* + * branch stack layout: + * nr: number of taken branches stored in entries[] + * hw_idx: The low level index of raw branch records + * for the most recent branch. + * -1ULL means invalid/unknown. + * + * Note that nr can vary from sample to sample + * branches (to, from) are stored from most recent + * to least recent, i.e., entries[0] contains the most + * recent branch. + * The entries[] is an abstraction of raw branch records, + * which may not be stored in age order in HW, e.g. Intel LBR. + * The hw_idx is to expose the low level index of raw + * branch record for the most recent branch aka entries[0]. + * The hw_idx index is between -1 (unknown) and max depth, + * which can be retrieved in /sys/devices/cpu/caps/branches. + * For the architectures whose raw branch records are + * already stored in age order, the hw_idx should be 0. + */ +struct perf_branch_stack { + __u64 nr; + __u64 hw_idx; + struct perf_branch_entry entries[]; +}; + +struct task_struct; + +/* + * extra PMU register associated with an event + */ +struct hw_perf_event_extra { + u64 config; /* register value */ + unsigned int reg; /* register address or index */ + int alloc; /* extra register already allocated */ + int idx; /* index in shared_regs->regs[] */ +}; + +/** + * hw_perf_event::flag values + * + * PERF_EVENT_FLAG_ARCH bits are reserved for architecture-specific + * usage. + */ +#define PERF_EVENT_FLAG_ARCH 0x000fffff +#define PERF_EVENT_FLAG_USER_READ_CNT 0x80000000 + +static_assert((PERF_EVENT_FLAG_USER_READ_CNT & PERF_EVENT_FLAG_ARCH) == 0); + +/** + * 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 rhlist_head bp_list; + }; +#endif + struct { /* amd_iommu */ + u8 iommu_bank; + u8 iommu_cntr; + u16 padding; + u64 conf; + u64 conf1; + }; + }; + /* + * If the event is a per task event, this will point to the task in + * question. See the comment in perf_event_alloc(). + */ + struct task_struct *target; + + /* + * PMU would store hardware filter configuration + * here. + */ + void *addr_filters; + + /* Last sync'ed generation of filters */ + unsigned long addr_filters_gen; + +/* + * hw_perf_event::state flags; used to track the PERF_EF_* state. + */ +#define PERF_HES_STOPPED 0x01 /* the counter is stopped */ +#define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */ +#define PERF_HES_ARCH 0x04 + + int state; + + /* + * The last observed hardware counter value, updated with a + * local64_cmpxchg() such that pmu::read() can be called nested. + */ + local64_t prev_count; + + /* + * The period to start the next sample with. + */ + u64 sample_period; + + union { + struct { /* Sampling */ + /* + * The period we started this sample with. + */ + u64 last_period; + + /* + * However much is left of the current period; + * note that this is a full 64bit value and + * allows for generation of periods longer + * than hardware might allow. + */ + local64_t period_left; + }; + struct { /* Topdown events counting for context switch */ + u64 saved_metric; + u64 saved_slots; + }; + }; + + /* + * State for throttling the event, see __perf_event_overflow() and + * perf_adjust_freq_unthr_context(). + */ + u64 interrupts_seq; + u64 interrupts; + + /* + * State for freq target events, see __perf_event_overflow() and + * perf_adjust_freq_unthr_context(). + */ + u64 freq_time_stamp; + u64 freq_count_stamp; +#endif +}; + +struct perf_event; + +/* + * Common implementation detail of pmu::{start,commit,cancel}_txn + */ +#define PERF_PMU_TXN_ADD 0x1 /* txn to add/schedule event on PMU */ +#define PERF_PMU_TXN_READ 0x2 /* txn to read event group from PMU */ + +/** + * pmu::capabilities flags + */ +#define PERF_PMU_CAP_NO_INTERRUPT 0x0001 +#define PERF_PMU_CAP_NO_NMI 0x0002 +#define PERF_PMU_CAP_AUX_NO_SG 0x0004 +#define PERF_PMU_CAP_EXTENDED_REGS 0x0008 +#define PERF_PMU_CAP_EXCLUSIVE 0x0010 +#define PERF_PMU_CAP_ITRACE 0x0020 +#define PERF_PMU_CAP_HETEROGENEOUS_CPUS 0x0040 +#define PERF_PMU_CAP_NO_EXCLUDE 0x0080 +#define PERF_PMU_CAP_AUX_OUTPUT 0x0100 +#define PERF_PMU_CAP_EXTENDED_HW_TYPE 0x0200 + +struct perf_output_handle; + +/** + * struct pmu - generic performance monitoring unit + */ +struct pmu { + struct list_head entry; + + struct module *module; + struct device *dev; + const struct attribute_group **attr_groups; + const struct attribute_group **attr_update; + const char *name; + int type; + + /* + * various common per-pmu feature flags + */ + int capabilities; + + int __percpu *pmu_disable_count; + struct perf_cpu_context __percpu *pmu_cpu_context; + atomic_t exclusive_cnt; /* < 0: cpu; > 0: tsk */ + int task_ctx_nr; + int hrtimer_interval_ms; + + /* number of address filters this PMU can do */ + unsigned int nr_addr_filters; + + /* + * Fully disable/enable this PMU, can be used to protect from the PMI + * as well as for lazy/batch writing of the MSRs. + */ + void (*pmu_enable) (struct pmu *pmu); /* optional */ + void (*pmu_disable) (struct pmu *pmu); /* optional */ + + /* + * Try and initialize the event for this PMU. + * + * Returns: + * -ENOENT -- @event is not for this PMU + * + * -ENODEV -- @event is for this PMU but PMU not present + * -EBUSY -- @event is for this PMU but PMU temporarily unavailable + * -EINVAL -- @event is for this PMU but @event is not valid + * -EOPNOTSUPP -- @event is for this PMU, @event is valid, but not supported + * -EACCES -- @event is for this PMU, @event is valid, but no privileges + * + * 0 -- @event is for this PMU and valid + * + * Other error return values are allowed. + */ + int (*event_init) (struct perf_event *event); + + /* + * Notification that the event was mapped or unmapped. Called + * in the context of the mapping task. + */ + void (*event_mapped) (struct perf_event *event, struct mm_struct *mm); /* optional */ + void (*event_unmapped) (struct perf_event *event, struct mm_struct *mm); /* optional */ + + /* + * Flags for ->add()/->del()/ ->start()/->stop(). There are + * matching hw_perf_event::state flags. + */ +#define PERF_EF_START 0x01 /* start the counter when adding */ +#define PERF_EF_RELOAD 0x02 /* reload the counter when starting */ +#define PERF_EF_UPDATE 0x04 /* update the counter when stopping */ + + /* + * Adds/Removes a counter to/from the PMU, can be done inside a + * transaction, see the ->*_txn() methods. + * + * The add/del callbacks will reserve all hardware resources required + * to service the event, this includes any counter constraint + * scheduling etc. + * + * Called with IRQs disabled and the PMU disabled on the CPU the event + * is on. + * + * ->add() called without PERF_EF_START should result in the same state + * as ->add() followed by ->stop(). + * + * ->del() must always PERF_EF_UPDATE stop an event. If it calls + * ->stop() that must deal with already being stopped without + * PERF_EF_UPDATE. + */ + int (*add) (struct perf_event *event, int flags); + void (*del) (struct perf_event *event, int flags); + + /* + * Starts/Stops a counter present on the PMU. + * + * The PMI handler should stop the counter when perf_event_overflow() + * returns !0. ->start() will be used to continue. + * + * Also used to change the sample period. + * + * Called with IRQs disabled and the PMU disabled on the CPU the event + * is on -- will be called from NMI context with the PMU generates + * NMIs. + * + * ->stop() with PERF_EF_UPDATE will read the counter and update + * period/count values like ->read() would. + * + * ->start() with PERF_EF_RELOAD will reprogram the counter + * value, must be preceded by a ->stop() with PERF_EF_UPDATE. + */ + void (*start) (struct perf_event *event, int flags); + void (*stop) (struct perf_event *event, int flags); + + /* + * Updates the counter value of the event. + * + * For sampling capable PMUs this will also update the software period + * hw_perf_event::period_left field. + */ + void (*read) (struct perf_event *event); + + /* + * Group events scheduling is treated as a transaction, add + * group events as a whole and perform one schedulability test. + * If the test fails, roll back the whole group + * + * Start the transaction, after this ->add() doesn't need to + * do schedulability tests. + * + * Optional. + */ + void (*start_txn) (struct pmu *pmu, unsigned int txn_flags); + /* + * If ->start_txn() disabled the ->add() schedulability test + * then ->commit_txn() is required to perform one. On success + * the transaction is closed. On error the transaction is kept + * open until ->cancel_txn() is called. + * + * Optional. + */ + int (*commit_txn) (struct pmu *pmu); + /* + * Will cancel the transaction, assumes ->del() is called + * for each successful ->add() during the transaction. + * + * Optional. + */ + void (*cancel_txn) (struct pmu *pmu); + + /* + * Will return the value for perf_event_mmap_page::index for this event, + * if no implementation is provided it will default to: event->hw.idx + 1. + */ + int (*event_idx) (struct perf_event *event); /*optional */ + + /* + * context-switches callback + */ + void (*sched_task) (struct perf_event_context *ctx, + bool sched_in); + + /* + * Kmem cache of PMU specific data + */ + struct kmem_cache *task_ctx_cache; + + /* + * PMU specific parts of task perf event context (i.e. ctx->task_ctx_data) + * can be synchronized using this function. See Intel LBR callstack support + * implementation and Perf core context switch handling callbacks for usage + * examples. + */ + void (*swap_task_ctx) (struct perf_event_context *prev, + struct perf_event_context *next); + /* optional */ + + /* + * Set up pmu-private data structures for an AUX area + */ + void *(*setup_aux) (struct perf_event *event, void **pages, + int nr_pages, bool overwrite); + /* optional */ + + /* + * Free pmu-private AUX data structures + */ + void (*free_aux) (void *aux); /* optional */ + + /* + * Take a snapshot of the AUX buffer without touching the event + * state, so that preempting ->start()/->stop() callbacks does + * not interfere with their logic. Called in PMI context. + * + * Returns the size of AUX data copied to the output handle. + * + * Optional. + */ + long (*snapshot_aux) (struct perf_event *event, + struct perf_output_handle *handle, + unsigned long size); + + /* + * Validate address range filters: make sure the HW supports the + * requested configuration and number of filters; return 0 if the + * supplied filters are valid, -errno otherwise. + * + * Runs in the context of the ioctl()ing process and is not serialized + * with the rest of the PMU callbacks. + */ + int (*addr_filters_validate) (struct list_head *filters); + /* optional */ + + /* + * Synchronize address range filter configuration: + * translate hw-agnostic filters into hardware configuration in + * event::hw::addr_filters. + * + * Runs as a part of filter sync sequence that is done in ->start() + * callback by calling perf_event_addr_filters_sync(). + * + * May (and should) traverse event::addr_filters::list, for which its + * caller provides necessary serialization. + */ + void (*addr_filters_sync) (struct perf_event *event); + /* optional */ + + /* + * Check if event can be used for aux_output purposes for + * events of this PMU. + * + * Runs from perf_event_open(). Should return 0 for "no match" + * or non-zero for "match". + */ + int (*aux_output_match) (struct perf_event *event); + /* optional */ + + /* + * Filter events for PMU-specific reasons. + */ + int (*filter_match) (struct perf_event *event); /* optional */ + + /* + * Check period value for PERF_EVENT_IOC_PERIOD ioctl. + */ + int (*check_period) (struct perf_event *event, u64 value); /* optional */ +}; + +enum perf_addr_filter_action_t { + PERF_ADDR_FILTER_ACTION_STOP = 0, + PERF_ADDR_FILTER_ACTION_START, + PERF_ADDR_FILTER_ACTION_FILTER, +}; + +/** + * struct perf_addr_filter - address range filter definition + * @entry: event's filter list linkage + * @path: object file's path for file-based filters + * @offset: filter range offset + * @size: filter range size (size==0 means single address trigger) + * @action: filter/start/stop + * + * This is a hardware-agnostic filter configuration as specified by the user. + */ +struct perf_addr_filter { + struct list_head entry; + struct path path; + unsigned long offset; + unsigned long size; + enum perf_addr_filter_action_t action; +}; + +/** + * struct perf_addr_filters_head - container for address range filters + * @list: list of filters for this event + * @lock: spinlock that serializes accesses to the @list and event's + * (and its children's) filter generations. + * @nr_file_filters: number of file-based filters + * + * A child event will use parent's @list (and therefore @lock), so they are + * bundled together; see perf_event_addr_filters(). + */ +struct perf_addr_filters_head { + struct list_head list; + raw_spinlock_t lock; + unsigned int nr_file_filters; +}; + +struct perf_addr_filter_range { + unsigned long start; + unsigned long size; +}; + +/** + * enum perf_event_state - the states of an event: + */ +enum perf_event_state { + PERF_EVENT_STATE_DEAD = -4, + PERF_EVENT_STATE_EXIT = -3, + PERF_EVENT_STATE_ERROR = -2, + PERF_EVENT_STATE_OFF = -1, + PERF_EVENT_STATE_INACTIVE = 0, + PERF_EVENT_STATE_ACTIVE = 1, +}; + +struct file; +struct perf_sample_data; + +typedef void (*perf_overflow_handler_t)(struct perf_event *, + struct perf_sample_data *, + struct pt_regs *regs); + +/* + * Event capabilities. For event_caps and groups caps. + * + * PERF_EV_CAP_SOFTWARE: Is a software event. + * PERF_EV_CAP_READ_ACTIVE_PKG: A CPU event (or cgroup event) that can be read + * from any CPU in the package where it is active. + * PERF_EV_CAP_SIBLING: An event with this flag must be a group sibling and + * cannot be a group leader. If an event with this flag is detached from the + * group it is scheduled out and moved into an unrecoverable ERROR state. + */ +#define PERF_EV_CAP_SOFTWARE BIT(0) +#define PERF_EV_CAP_READ_ACTIVE_PKG BIT(1) +#define PERF_EV_CAP_SIBLING BIT(2) + +#define SWEVENT_HLIST_BITS 8 +#define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS) + +struct swevent_hlist { + struct hlist_head heads[SWEVENT_HLIST_SIZE]; + struct rcu_head rcu_head; +}; + +#define PERF_ATTACH_CONTEXT 0x01 +#define PERF_ATTACH_GROUP 0x02 +#define PERF_ATTACH_TASK 0x04 +#define PERF_ATTACH_TASK_DATA 0x08 +#define PERF_ATTACH_ITRACE 0x10 +#define PERF_ATTACH_SCHED_CB 0x20 +#define PERF_ATTACH_CHILD 0x40 + +struct bpf_prog; +struct perf_cgroup; +struct perf_buffer; + +struct pmu_event_list { + raw_spinlock_t lock; + struct list_head list; +}; + +/* + * event->sibling_list is modified whole holding both ctx->lock and ctx->mutex + * as such iteration must hold either lock. However, since ctx->lock is an IRQ + * safe lock, and is only held by the CPU doing the modification, having IRQs + * disabled is sufficient since it will hold-off the IPIs. + */ +#ifdef CONFIG_PROVE_LOCKING +#define lockdep_assert_event_ctx(event) \ + WARN_ON_ONCE(__lockdep_enabled && \ + (this_cpu_read(hardirqs_enabled) && \ + lockdep_is_held(&(event)->ctx->mutex) != LOCK_STATE_HELD)) +#else +#define lockdep_assert_event_ctx(event) +#endif + +#define for_each_sibling_event(sibling, event) \ + lockdep_assert_event_ctx(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; + + unsigned int group_generation; + struct perf_event *group_leader; + struct pmu *pmu; + void *pmu_private; + + enum perf_event_state state; + unsigned int attach_state; + local64_t count; + atomic64_t child_count; + + /* + * These are the total time in nanoseconds that the event + * has been enabled (i.e. eligible to run, and the task has + * been scheduled in, if this is a per-task event) + * and running (scheduled onto the CPU), respectively. + */ + u64 total_time_enabled; + u64 total_time_running; + u64 tstamp; + + struct perf_event_attr attr; + u16 header_size; + u16 id_header_size; + u16 read_size; + struct hw_perf_event hw; + + struct perf_event_context *ctx; + atomic_long_t refcount; + + /* + * These accumulate total time (in nanoseconds) that children + * events have been enabled and running, respectively. + */ + atomic64_t child_total_time_enabled; + atomic64_t child_total_time_running; + + /* + * Protect attach/detach and child_list: + */ + struct mutex child_mutex; + struct list_head child_list; + struct perf_event *parent; + + int oncpu; + int cpu; + + struct list_head owner_entry; + struct task_struct *owner; + + /* mmap bits */ + struct mutex mmap_mutex; + atomic_t mmap_count; + + struct perf_buffer *rb; + struct list_head rb_entry; + unsigned long rcu_batches; + int rcu_pending; + + /* poll related */ + wait_queue_head_t waitq; + struct fasync_struct *fasync; + + /* delayed work for NMIs and such */ + unsigned int pending_wakeup; + unsigned int pending_kill; + unsigned int pending_disable; + unsigned int pending_sigtrap; + unsigned long pending_addr; /* SIGTRAP */ + struct irq_work pending_irq; + struct callback_head pending_task; + unsigned int pending_work; + + atomic_t event_limit; + + /* address range filters */ + struct perf_addr_filters_head addr_filters; + /* vma address array for file-based filders */ + struct perf_addr_filter_range *addr_filter_ranges; + unsigned long addr_filters_gen; + + /* for aux_output events */ + struct perf_event *aux_event; + + void (*destroy)(struct perf_event *); + struct rcu_head rcu_head; + + struct pid_namespace *ns; + u64 id; + + atomic64_t lost_samples; + + u64 (*clock)(void); + perf_overflow_handler_t overflow_handler; + void *overflow_handler_context; +#ifdef CONFIG_BPF_SYSCALL + perf_overflow_handler_t orig_overflow_handler; + struct bpf_prog *prog; + u64 bpf_cookie; +#endif + +#ifdef CONFIG_EVENT_TRACING + struct trace_event_call *tp_event; + struct event_filter *filter; +#ifdef CONFIG_FUNCTION_TRACER + struct ftrace_ops ftrace_ops; +#endif +#endif + +#ifdef CONFIG_CGROUP_PERF + struct perf_cgroup *cgrp; /* cgroup event is attach to */ +#endif + +#ifdef CONFIG_SECURITY + void *security; +#endif + struct list_head sb_list; +#endif /* CONFIG_PERF_EVENTS */ +}; + + +struct perf_event_groups { + struct rb_root tree; + u64 index; +}; + +/** + * struct perf_event_context - event context structure + * + * Used as a container for task events and CPU events as well: + */ +struct perf_event_context { + struct pmu *pmu; + /* + * Protect the states of the events in the list, + * nr_active, and the list: + */ + raw_spinlock_t lock; + /* + * Protect the list of events. Locking either mutex or lock + * is sufficient to ensure the list doesn't change; to change + * the list you need to lock both the mutex and the spinlock. + */ + struct mutex mutex; + + struct list_head active_ctx_list; + struct perf_event_groups pinned_groups; + struct perf_event_groups flexible_groups; + struct list_head event_list; + + struct list_head pinned_active; + struct list_head flexible_active; + + int nr_events; + int nr_active; + int nr_user; + int is_active; + int nr_stat; + int nr_freq; + int rotate_disable; + /* + * Set when nr_events != nr_active, except tolerant to events not + * necessary to be active due to scheduling constraints, such as cgroups. + */ + int rotate_necessary; + refcount_t refcount; + struct task_struct *task; + + /* + * Context clock, runs when context enabled. + */ + u64 time; + u64 timestamp; + u64 timeoffset; + + /* + * These fields let us detect when two contexts have both + * been cloned (inherited) from a common ancestor. + */ + struct perf_event_context *parent_ctx; + u64 parent_gen; + u64 generation; + int pin_count; +#ifdef CONFIG_CGROUP_PERF + int nr_cgroups; /* cgroup evts */ +#endif + void *task_ctx_data; /* pmu specific data */ + struct rcu_head rcu_head; + + /* + * Sum (event->pending_sigtrap + event->pending_work) + * + * The SIGTRAP is targeted at ctx->task, as such it won't do changing + * that until the signal is delivered. + */ + local_t nr_pending; +}; + +/* + * Number of contexts where an event can trigger: + * task, softirq, hardirq, nmi. + */ +#define PERF_NR_CONTEXTS 4 + +/** + * struct perf_cpu_context - per cpu event context structure + */ +struct perf_cpu_context { + struct perf_event_context ctx; + struct perf_event_context *task_ctx; + int active_oncpu; + int exclusive; + + raw_spinlock_t hrtimer_lock; + struct hrtimer hrtimer; + ktime_t hrtimer_interval; + unsigned int hrtimer_active; + +#ifdef CONFIG_CGROUP_PERF + struct perf_cgroup *cgrp; + struct list_head cgrp_cpuctx_entry; +#endif + + struct list_head sched_cb_entry; + int sched_cb_usage; + + int online; + /* + * Per-CPU storage for iterators used in visit_groups_merge. The default + * storage is of size 2 to hold the CPU and any CPU event iterators. + */ + int heap_size; + struct perf_event **heap; + struct perf_event *heap_default[2]; +}; + +struct perf_output_handle { + struct perf_event *event; + struct perf_buffer *rb; + unsigned long wakeup; + unsigned long size; + u64 aux_flags; + union { + void *addr; + unsigned long head; + }; + int page; +}; + +struct bpf_perf_event_data_kern { + bpf_user_pt_regs_t *regs; + struct perf_sample_data *data; + struct perf_event *event; +}; + +#ifdef CONFIG_CGROUP_PERF + +/* + * perf_cgroup_info keeps track of time_enabled for a cgroup. + * This is a per-cpu dynamically allocated data structure. + */ +struct perf_cgroup_info { + u64 time; + u64 timestamp; + u64 timeoffset; + int active; +}; + +struct perf_cgroup { + struct cgroup_subsys_state css; + struct perf_cgroup_info __percpu *info; +}; + +/* + * Must ensure cgroup is pinned (css_get) before calling + * this function. In other words, we cannot call this function + * if there is no cgroup event for the current CPU context. + */ +static inline struct perf_cgroup * +perf_cgroup_from_task(struct task_struct *task, struct perf_event_context *ctx) +{ + return container_of(task_css_check(task, perf_event_cgrp_id, + ctx ? lockdep_is_held(&ctx->lock) + : true), + struct perf_cgroup, css); +} +#endif /* CONFIG_CGROUP_PERF */ + +#ifdef CONFIG_PERF_EVENTS + +extern void *perf_aux_output_begin(struct perf_output_handle *handle, + struct perf_event *event); +extern void perf_aux_output_end(struct perf_output_handle *handle, + unsigned long size); +extern int perf_aux_output_skip(struct perf_output_handle *handle, + unsigned long size); +extern void *perf_get_aux(struct perf_output_handle *handle); +extern void perf_aux_output_flag(struct perf_output_handle *handle, u64 flags); +extern void perf_event_itrace_started(struct perf_event *event); + +extern int perf_pmu_register(struct pmu *pmu, const char *name, int type); +extern void perf_pmu_unregister(struct pmu *pmu); + +extern void __perf_event_task_sched_in(struct task_struct *prev, + struct task_struct *task); +extern void __perf_event_task_sched_out(struct task_struct *prev, + struct task_struct *next); +extern int perf_event_init_task(struct task_struct *child, u64 clone_flags); +extern void perf_event_exit_task(struct task_struct *child); +extern void perf_event_free_task(struct task_struct *task); +extern void perf_event_delayed_put(struct task_struct *task); +extern struct file *perf_event_get(unsigned int fd); +extern const struct perf_event *perf_get_event(struct file *file); +extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event); +extern void perf_event_print_debug(void); +extern void perf_pmu_disable(struct pmu *pmu); +extern void perf_pmu_enable(struct pmu *pmu); +extern void perf_sched_cb_dec(struct pmu *pmu); +extern void perf_sched_cb_inc(struct pmu *pmu); +extern int perf_event_task_disable(void); +extern int perf_event_task_enable(void); + +extern void perf_pmu_resched(struct pmu *pmu); + +extern int perf_event_refresh(struct perf_event *event, int refresh); +extern void perf_event_update_userpage(struct perf_event *event); +extern int perf_event_release_kernel(struct perf_event *event); +extern struct perf_event * +perf_event_create_kernel_counter(struct perf_event_attr *attr, + int cpu, + struct task_struct *task, + perf_overflow_handler_t callback, + void *context); +extern void perf_pmu_migrate_context(struct pmu *pmu, + int src_cpu, int dst_cpu); +int perf_event_read_local(struct perf_event *event, u64 *value, + u64 *enabled, u64 *running); +extern u64 perf_event_read_value(struct perf_event *event, + u64 *enabled, u64 *running); + + +struct perf_sample_data { + /* + * Fields set by perf_sample_data_init(), group so as to + * minimize the cachelines touched. + */ + u64 sample_flags; + u64 period; + + /* + * The other fields, optionally {set,used} by + * perf_{prepare,output}_sample(). + */ + struct perf_branch_stack *br_stack; + union perf_sample_weight weight; + union perf_mem_data_src data_src; + u64 txn; + u64 addr; + struct perf_raw_record *raw; + + u64 type; + u64 ip; + struct { + u32 pid; + u32 tid; + } tid_entry; + u64 time; + u64 id; + u64 stream_id; + struct { + u32 cpu; + u32 reserved; + } cpu_entry; + struct perf_callchain_entry *callchain; + u64 aux_size; + + struct perf_regs regs_user; + struct perf_regs regs_intr; + u64 stack_user_size; + + u64 phys_addr; + u64 cgroup; + u64 data_page_size; + u64 code_page_size; +} ____cacheline_aligned; + +/* default value for data source */ +#define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\ + PERF_MEM_S(LVL, NA) |\ + PERF_MEM_S(SNOOP, NA) |\ + PERF_MEM_S(LOCK, NA) |\ + PERF_MEM_S(TLB, NA)) + +static inline void perf_sample_data_init(struct perf_sample_data *data, + u64 addr, u64 period) +{ + /* remaining struct members initialized in perf_prepare_sample() */ + data->sample_flags = PERF_SAMPLE_PERIOD; + data->period = period; + + if (addr) { + data->addr = addr; + data->sample_flags |= PERF_SAMPLE_ADDR; + } +} + +/* + * Clear all bitfields in the perf_branch_entry. + * The to and from fields are not cleared because they are + * systematically modified by caller. + */ +static inline void perf_clear_branch_entry_bitfields(struct perf_branch_entry *br) +{ + br->mispred = 0; + br->predicted = 0; + br->in_tx = 0; + br->abort = 0; + br->cycles = 0; + br->type = 0; + br->spec = PERF_BR_SPEC_NA; + br->reserved = 0; +} + +extern void perf_output_sample(struct perf_output_handle *handle, + struct perf_event_header *header, + struct perf_sample_data *data, + struct perf_event *event); +extern void perf_prepare_sample(struct perf_event_header *header, + struct perf_sample_data *data, + struct perf_event *event, + struct pt_regs *regs); + +extern int perf_event_overflow(struct perf_event *event, + struct perf_sample_data *data, + struct pt_regs *regs); + +extern void perf_event_output_forward(struct perf_event *event, + struct perf_sample_data *data, + struct pt_regs *regs); +extern void perf_event_output_backward(struct perf_event *event, + struct perf_sample_data *data, + struct pt_regs *regs); +extern int perf_event_output(struct perf_event *event, + struct perf_sample_data *data, + struct pt_regs *regs); + +static inline bool +__is_default_overflow_handler(perf_overflow_handler_t overflow_handler) +{ + if (likely(overflow_handler == perf_event_output_forward)) + return true; + if (unlikely(overflow_handler == perf_event_output_backward)) + return true; + return false; +} + +#define is_default_overflow_handler(event) \ + __is_default_overflow_handler((event)->overflow_handler) + +#ifdef CONFIG_BPF_SYSCALL +static inline bool uses_default_overflow_handler(struct perf_event *event) +{ + if (likely(is_default_overflow_handler(event))) + return true; + + return __is_default_overflow_handler(event->orig_overflow_handler); +} +#else +#define uses_default_overflow_handler(event) \ + is_default_overflow_handler(event) +#endif + +extern void +perf_event_header__init_id(struct perf_event_header *header, + struct perf_sample_data *data, + struct perf_event *event); +extern void +perf_event__output_id_sample(struct perf_event *event, + struct perf_output_handle *handle, + struct perf_sample_data *sample); + +extern void +perf_log_lost_samples(struct perf_event *event, u64 lost); + +static inline bool event_has_any_exclude_flag(struct perf_event *event) +{ + struct perf_event_attr *attr = &event->attr; + + return attr->exclude_idle || attr->exclude_user || + attr->exclude_kernel || attr->exclude_hv || + attr->exclude_guest || attr->exclude_host; +} + +static inline bool is_sampling_event(struct perf_event *event) +{ + return event->attr.sample_period != 0; +} + +/* + * Return 1 for a software event, 0 for a hardware event + */ +static inline int is_software_event(struct perf_event *event) +{ + return event->event_caps & PERF_EV_CAP_SOFTWARE; +} + +/* + * Return 1 for event in sw context, 0 for event in hw context + */ +static inline int in_software_context(struct perf_event *event) +{ + return event->ctx->pmu->task_ctx_nr == perf_sw_context; +} + +static inline int is_exclusive_pmu(struct pmu *pmu) +{ + return pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE; +} + +extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX]; + +extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64); +extern void __perf_sw_event(u32, u64, struct pt_regs *, u64); + +#ifndef perf_arch_fetch_caller_regs +static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { } +#endif + +/* + * When generating a perf sample in-line, instead of from an interrupt / + * exception, we lack a pt_regs. This is typically used from software events + * like: SW_CONTEXT_SWITCHES, SW_MIGRATIONS and the tie-in with tracepoints. + * + * We typically don't need a full set, but (for x86) do require: + * - ip for PERF_SAMPLE_IP + * - cs for user_mode() tests + * - sp for PERF_SAMPLE_CALLCHAIN + * - eflags for MISC bits and CALLCHAIN (see: perf_hw_regs()) + * + * NOTE: assumes @regs is otherwise already 0 filled; this is important for + * things like PERF_SAMPLE_REGS_INTR. + */ +static inline void perf_fetch_caller_regs(struct pt_regs *regs) +{ + perf_arch_fetch_caller_regs(regs, CALLER_ADDR0); +} + +static __always_inline void +perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) +{ + if (static_key_false(&perf_swevent_enabled[event_id])) + __perf_sw_event(event_id, nr, regs, addr); +} + +DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]); + +/* + * 'Special' version for the scheduler, it hard assumes no recursion, + * which is guaranteed by us not actually scheduling inside other swevents + * because those disable preemption. + */ +static __always_inline void __perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) +{ + struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]); + + perf_fetch_caller_regs(regs); + ___perf_sw_event(event_id, nr, regs, addr); +} + +extern struct static_key_false perf_sched_events; + +static __always_inline bool __perf_sw_enabled(int swevt) +{ + return static_key_false(&perf_swevent_enabled[swevt]); +} + +static inline void perf_event_task_migrate(struct task_struct *task) +{ + if (__perf_sw_enabled(PERF_COUNT_SW_CPU_MIGRATIONS)) + task->sched_migrated = 1; +} + +static inline void perf_event_task_sched_in(struct task_struct *prev, + struct task_struct *task) +{ + if (static_branch_unlikely(&perf_sched_events)) + __perf_event_task_sched_in(prev, task); + + if (__perf_sw_enabled(PERF_COUNT_SW_CPU_MIGRATIONS) && + task->sched_migrated) { + __perf_sw_event_sched(PERF_COUNT_SW_CPU_MIGRATIONS, 1, 0); + task->sched_migrated = 0; + } +} + +static inline void perf_event_task_sched_out(struct task_struct *prev, + struct task_struct *next) +{ + if (__perf_sw_enabled(PERF_COUNT_SW_CONTEXT_SWITCHES)) + __perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0); + +#ifdef CONFIG_CGROUP_PERF + if (__perf_sw_enabled(PERF_COUNT_SW_CGROUP_SWITCHES) && + perf_cgroup_from_task(prev, NULL) != + perf_cgroup_from_task(next, NULL)) + __perf_sw_event_sched(PERF_COUNT_SW_CGROUP_SWITCHES, 1, 0); +#endif + + if (static_branch_unlikely(&perf_sched_events)) + __perf_event_task_sched_out(prev, next); +} + +extern void perf_event_mmap(struct vm_area_struct *vma); + +extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, + bool unregister, const char *sym); +extern void perf_event_bpf_event(struct bpf_prog *prog, + enum perf_bpf_event_type type, + u16 flags); + +#ifdef CONFIG_GUEST_PERF_EVENTS +extern struct perf_guest_info_callbacks __rcu *perf_guest_cbs; + +DECLARE_STATIC_CALL(__perf_guest_state, *perf_guest_cbs->state); +DECLARE_STATIC_CALL(__perf_guest_get_ip, *perf_guest_cbs->get_ip); +DECLARE_STATIC_CALL(__perf_guest_handle_intel_pt_intr, *perf_guest_cbs->handle_intel_pt_intr); + +static inline unsigned int perf_guest_state(void) +{ + return static_call(__perf_guest_state)(); +} +static inline unsigned long perf_guest_get_ip(void) +{ + return static_call(__perf_guest_get_ip)(); +} +static inline unsigned int perf_guest_handle_intel_pt_intr(void) +{ + return static_call(__perf_guest_handle_intel_pt_intr)(); +} +extern void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs); +extern void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs); +#else +static inline unsigned int perf_guest_state(void) { return 0; } +static inline unsigned long perf_guest_get_ip(void) { return 0; } +static inline unsigned int perf_guest_handle_intel_pt_intr(void) { return 0; } +#endif /* CONFIG_GUEST_PERF_EVENTS */ + +extern void perf_event_exec(void); +extern void perf_event_comm(struct task_struct *tsk, bool exec); +extern void perf_event_namespaces(struct task_struct *tsk); +extern void perf_event_fork(struct task_struct *tsk); +extern void perf_event_text_poke(const void *addr, + const void *old_bytes, size_t old_len, + const void *new_bytes, size_t new_len); + +/* Callchains */ +DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry); + +extern void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); +extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); +extern struct perf_callchain_entry * +get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user, + u32 max_stack, bool crosstask, bool add_mark); +extern struct perf_callchain_entry *perf_callchain(struct perf_event *event, struct pt_regs *regs); +extern int get_callchain_buffers(int max_stack); +extern void put_callchain_buffers(void); +extern struct perf_callchain_entry *get_callchain_entry(int *rctx); +extern void put_callchain_entry(int rctx); + +extern int sysctl_perf_event_max_stack; +extern int sysctl_perf_event_max_contexts_per_stack; + +static inline int perf_callchain_store_context(struct perf_callchain_entry_ctx *ctx, u64 ip) +{ + if (ctx->contexts < sysctl_perf_event_max_contexts_per_stack) { + struct perf_callchain_entry *entry = ctx->entry; + entry->ip[entry->nr++] = ip; + ++ctx->contexts; + return 0; + } else { + ctx->contexts_maxed = true; + return -1; /* no more room, stop walking the stack */ + } +} + +static inline int perf_callchain_store(struct perf_callchain_entry_ctx *ctx, u64 ip) +{ + if (ctx->nr < ctx->max_stack && !ctx->contexts_maxed) { + struct perf_callchain_entry *entry = ctx->entry; + entry->ip[entry->nr++] = ip; + ++ctx->nr; + return 0; + } else { + return -1; /* no more room, stop walking the stack */ + } +} + +extern int sysctl_perf_event_paranoid; +extern int sysctl_perf_event_mlock; +extern int sysctl_perf_event_sample_rate; +extern int sysctl_perf_cpu_time_max_percent; + +extern void perf_sample_event_took(u64 sample_len_ns); + +int perf_proc_update_handler(struct ctl_table *table, int write, + void *buffer, size_t *lenp, loff_t *ppos); +int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write, + void *buffer, size_t *lenp, loff_t *ppos); +int perf_event_max_stack_handler(struct ctl_table *table, int write, + void *buffer, size_t *lenp, loff_t *ppos); + +/* Access to perf_event_open(2) syscall. */ +#define PERF_SECURITY_OPEN 0 + +/* Finer grained perf_event_open(2) access control. */ +#define PERF_SECURITY_CPU 1 +#define PERF_SECURITY_KERNEL 2 +#define PERF_SECURITY_TRACEPOINT 3 + +static inline int perf_is_paranoid(void) +{ + return sysctl_perf_event_paranoid > -1; +} + +static inline int perf_allow_kernel(struct perf_event_attr *attr) +{ + if (sysctl_perf_event_paranoid > 1 && !perfmon_capable()) + return -EACCES; + + return security_perf_event_open(attr, PERF_SECURITY_KERNEL); +} + +static inline int perf_allow_cpu(struct perf_event_attr *attr) +{ + if (sysctl_perf_event_paranoid > 0 && !perfmon_capable()) + return -EACCES; + + return security_perf_event_open(attr, PERF_SECURITY_CPU); +} + +static inline int perf_allow_tracepoint(struct perf_event_attr *attr) +{ + if (sysctl_perf_event_paranoid > -1 && !perfmon_capable()) + return -EPERM; + + return security_perf_event_open(attr, PERF_SECURITY_TRACEPOINT); +} + +extern void perf_event_init(void); +extern void perf_tp_event(u16 event_type, u64 count, void *record, + int entry_size, struct pt_regs *regs, + struct hlist_head *head, int rctx, + struct task_struct *task); +extern void perf_bp_event(struct perf_event *event, void *data); + +#ifndef perf_misc_flags +# define perf_misc_flags(regs) \ + (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL) +# define perf_instruction_pointer(regs) instruction_pointer(regs) +#endif +#ifndef perf_arch_bpf_user_pt_regs +# define perf_arch_bpf_user_pt_regs(regs) regs +#endif + +static inline bool has_branch_stack(struct perf_event *event) +{ + return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK; +} + +static inline bool needs_branch_stack(struct perf_event *event) +{ + return event->attr.branch_sample_type != 0; +} + +static inline bool has_aux(struct perf_event *event) +{ + return event->pmu->setup_aux; +} + +static inline bool is_write_backward(struct perf_event *event) +{ + return !!event->attr.write_backward; +} + +static inline bool has_addr_filter(struct perf_event *event) +{ + return event->pmu->nr_addr_filters; +} + +/* + * An inherited event uses parent's filters + */ +static inline struct perf_addr_filters_head * +perf_event_addr_filters(struct perf_event *event) +{ + struct perf_addr_filters_head *ifh = &event->addr_filters; + + if (event->parent) + ifh = &event->parent->addr_filters; + + return ifh; +} + +extern void perf_event_addr_filters_sync(struct perf_event *event); +extern void perf_report_aux_output_id(struct perf_event *event, u64 hw_id); + +extern int perf_output_begin(struct perf_output_handle *handle, + struct perf_sample_data *data, + struct perf_event *event, unsigned int size); +extern int perf_output_begin_forward(struct perf_output_handle *handle, + struct perf_sample_data *data, + struct perf_event *event, + unsigned int size); +extern int perf_output_begin_backward(struct perf_output_handle *handle, + struct perf_sample_data *data, + struct perf_event *event, + unsigned int size); + +extern void perf_output_end(struct perf_output_handle *handle); +extern unsigned int perf_output_copy(struct perf_output_handle *handle, + const void *buf, unsigned int len); +extern unsigned int perf_output_skip(struct perf_output_handle *handle, + unsigned int len); +extern long perf_output_copy_aux(struct perf_output_handle *aux_handle, + struct perf_output_handle *handle, + unsigned long from, unsigned long to); +extern int perf_swevent_get_recursion_context(void); +extern void perf_swevent_put_recursion_context(int rctx); +extern u64 perf_swevent_set_period(struct perf_event *event); +extern void perf_event_enable(struct perf_event *event); +extern void perf_event_disable(struct perf_event *event); +extern void perf_event_disable_local(struct perf_event *event); +extern void perf_event_disable_inatomic(struct perf_event *event); +extern void perf_event_task_tick(void); +extern int perf_event_account_interrupt(struct perf_event *event); +extern int perf_event_period(struct perf_event *event, u64 value); +extern u64 perf_event_pause(struct perf_event *event, bool reset); +#else /* !CONFIG_PERF_EVENTS: */ +static inline void * +perf_aux_output_begin(struct perf_output_handle *handle, + struct perf_event *event) { return NULL; } +static inline void +perf_aux_output_end(struct perf_output_handle *handle, unsigned long size) + { } +static inline int +perf_aux_output_skip(struct perf_output_handle *handle, + unsigned long size) { return -EINVAL; } +static inline void * +perf_get_aux(struct perf_output_handle *handle) { return NULL; } +static inline void +perf_event_task_migrate(struct task_struct *task) { } +static inline void +perf_event_task_sched_in(struct task_struct *prev, + struct task_struct *task) { } +static inline void +perf_event_task_sched_out(struct task_struct *prev, + struct task_struct *next) { } +static inline int perf_event_init_task(struct task_struct *child, + u64 clone_flags) { return 0; } +static inline void perf_event_exit_task(struct task_struct *child) { } +static inline void perf_event_free_task(struct task_struct *task) { } +static inline void perf_event_delayed_put(struct task_struct *task) { } +static inline struct file *perf_event_get(unsigned int fd) { return ERR_PTR(-EINVAL); } +static inline const struct perf_event *perf_get_event(struct file *file) +{ + return ERR_PTR(-EINVAL); +} +static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event) +{ + return ERR_PTR(-EINVAL); +} +static inline int perf_event_read_local(struct perf_event *event, u64 *value, + u64 *enabled, u64 *running) +{ + return -EINVAL; +} +static inline void perf_event_print_debug(void) { } +static inline int perf_event_task_disable(void) { return -EINVAL; } +static inline int perf_event_task_enable(void) { return -EINVAL; } +static inline int perf_event_refresh(struct perf_event *event, int refresh) +{ + return -EINVAL; +} + +static inline void +perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { } +static inline void +perf_bp_event(struct perf_event *event, void *data) { } + +static inline void perf_event_mmap(struct vm_area_struct *vma) { } + +typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data); +static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, + bool unregister, const char *sym) { } +static inline void perf_event_bpf_event(struct bpf_prog *prog, + enum perf_bpf_event_type type, + u16 flags) { } +static inline void perf_event_exec(void) { } +static inline void perf_event_comm(struct task_struct *tsk, bool exec) { } +static inline void perf_event_namespaces(struct task_struct *tsk) { } +static inline void perf_event_fork(struct task_struct *tsk) { } +static inline void perf_event_text_poke(const void *addr, + const void *old_bytes, + size_t old_len, + const void *new_bytes, + size_t new_len) { } +static inline void perf_event_init(void) { } +static inline int perf_swevent_get_recursion_context(void) { return -1; } +static inline void perf_swevent_put_recursion_context(int rctx) { } +static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; } +static inline void perf_event_enable(struct perf_event *event) { } +static inline void perf_event_disable(struct perf_event *event) { } +static inline int __perf_event_disable(void *info) { return -1; } +static inline void perf_event_task_tick(void) { } +static inline int perf_event_release_kernel(struct perf_event *event) { return 0; } +static inline int perf_event_period(struct perf_event *event, u64 value) +{ + return -EINVAL; +} +static inline u64 perf_event_pause(struct perf_event *event, bool reset) +{ + return 0; +} +#endif + +#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL) +extern void perf_restore_debug_store(void); +#else +static inline void perf_restore_debug_store(void) { } +#endif + +static __always_inline bool perf_raw_frag_last(const struct perf_raw_frag *frag) +{ + return frag->pad < sizeof(u64); +} + +#define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x)) + +struct perf_pmu_events_attr { + struct device_attribute attr; + u64 id; + const char *event_str; +}; + +struct perf_pmu_events_ht_attr { + struct device_attribute attr; + u64 id; + const char *event_str_ht; + const char *event_str_noht; +}; + +struct perf_pmu_events_hybrid_attr { + struct device_attribute attr; + u64 id; + const char *event_str; + u64 pmu_type; +}; + +struct perf_pmu_format_hybrid_attr { + struct device_attribute attr; + u64 pmu_type; +}; + +ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr, + char *page); + +#define PMU_EVENT_ATTR(_name, _var, _id, _show) \ +static struct perf_pmu_events_attr _var = { \ + .attr = __ATTR(_name, 0444, _show, NULL), \ + .id = _id, \ +}; + +#define PMU_EVENT_ATTR_STRING(_name, _var, _str) \ +static struct perf_pmu_events_attr _var = { \ + .attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \ + .id = 0, \ + .event_str = _str, \ +}; + +#define PMU_EVENT_ATTR_ID(_name, _show, _id) \ + (&((struct perf_pmu_events_attr[]) { \ + { .attr = __ATTR(_name, 0444, _show, NULL), \ + .id = _id, } \ + })[0].attr.attr) + +#define PMU_FORMAT_ATTR(_name, _format) \ +static ssize_t \ +_name##_show(struct device *dev, \ + struct device_attribute *attr, \ + char *page) \ +{ \ + BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \ + return sprintf(page, _format "\n"); \ +} \ + \ +static struct device_attribute format_attr_##_name = __ATTR_RO(_name) + +/* Performance counter hotplug functions */ +#ifdef CONFIG_PERF_EVENTS +int perf_event_init_cpu(unsigned int cpu); +int perf_event_exit_cpu(unsigned int cpu); +#else +#define perf_event_init_cpu NULL +#define perf_event_exit_cpu NULL +#endif + +extern void __weak arch_perf_update_userpage(struct perf_event *event, + struct perf_event_mmap_page *userpg, + u64 now); + +#ifdef CONFIG_MMU +extern __weak u64 arch_perf_get_page_size(struct mm_struct *mm, unsigned long addr); +#endif + +/* + * Snapshot branch stack on software events. + * + * Branch stack can be very useful in understanding software events. For + * example, when a long function, e.g. sys_perf_event_open, returns an + * errno, it is not obvious why the function failed. Branch stack could + * provide very helpful information in this type of scenarios. + * + * On software event, it is necessary to stop the hardware branch recorder + * fast. Otherwise, the hardware register/buffer will be flushed with + * entries of the triggering event. Therefore, static call is used to + * stop the hardware recorder. + */ + +/* + * cnt is the number of entries allocated for entries. + * Return number of entries copied to . + */ +typedef int (perf_snapshot_branch_stack_t)(struct perf_branch_entry *entries, + unsigned int cnt); +DECLARE_STATIC_CALL(perf_snapshot_branch_stack, perf_snapshot_branch_stack_t); + +#ifndef PERF_NEEDS_LOPWR_CB +static inline void perf_lopwr_cb(bool mode) +{ +} +#endif + +#ifdef CONFIG_PERF_EVENTS +static inline bool branch_sample_no_flags(const struct perf_event *event) +{ + return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_NO_FLAGS; +} + +static inline bool branch_sample_no_cycles(const struct perf_event *event) +{ + return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_NO_CYCLES; +} + +static inline bool branch_sample_type(const struct perf_event *event) +{ + return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_TYPE_SAVE; +} + +static inline bool branch_sample_hw_index(const struct perf_event *event) +{ + return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX; +} + +static inline bool branch_sample_priv(const struct perf_event *event) +{ + return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_PRIV_SAVE; +} +#endif /* CONFIG_PERF_EVENTS */ +#endif /* _LINUX_PERF_EVENT_H */ |