4 * Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
5 * Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
6 * Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
8 * Data type definitions, declarations, prototypes.
10 * Started by: Thomas Gleixner and Ingo Molnar
12 * For licencing details see kernel-base/COPYING
14 #ifndef _LINUX_PERF_EVENT_H
15 #define _LINUX_PERF_EVENT_H
17 #include <uapi/linux/perf_event.h>
20 * Kernel-internal data types and definitions:
23 #ifdef CONFIG_PERF_EVENTS
24 # include <asm/perf_event.h>
25 # include <asm/local64.h>
28 struct perf_guest_info_callbacks {
29 int (*is_in_guest)(void);
30 int (*is_user_mode)(void);
31 unsigned long (*get_guest_ip)(void);
34 #ifdef CONFIG_HAVE_HW_BREAKPOINT
35 #include <asm/hw_breakpoint.h>
38 #include <linux/list.h>
39 #include <linux/mutex.h>
40 #include <linux/rculist.h>
41 #include <linux/rcupdate.h>
42 #include <linux/spinlock.h>
43 #include <linux/hrtimer.h>
45 #include <linux/pid_namespace.h>
46 #include <linux/workqueue.h>
47 #include <linux/ftrace.h>
48 #include <linux/cpu.h>
49 #include <linux/irq_work.h>
50 #include <linux/static_key.h>
51 #include <linux/jump_label_ratelimit.h>
52 #include <linux/atomic.h>
53 #include <linux/sysfs.h>
54 #include <linux/perf_regs.h>
55 #include <linux/workqueue.h>
56 #include <linux/cgroup.h>
57 #include <asm/local.h>
59 struct perf_callchain_entry {
61 __u64 ip[PERF_MAX_STACK_DEPTH];
64 struct perf_raw_record {
70 * branch stack layout:
71 * nr: number of taken branches stored in entries[]
73 * Note that nr can vary from sample to sample
74 * branches (to, from) are stored from most recent
75 * to least recent, i.e., entries[0] contains the most
78 struct perf_branch_stack {
80 struct perf_branch_entry entries[0];
86 * extra PMU register associated with an event
88 struct hw_perf_event_extra {
89 u64 config; /* register value */
90 unsigned int reg; /* register address or index */
91 int alloc; /* extra register already allocated */
92 int idx; /* index in shared_regs->regs[] */
96 * struct hw_perf_event - performance event hardware details:
98 struct hw_perf_event {
99 #ifdef CONFIG_PERF_EVENTS
101 struct { /* hardware */
104 unsigned long config_base;
105 unsigned long event_base;
106 int event_base_rdpmc;
111 struct hw_perf_event_extra extra_reg;
112 struct hw_perf_event_extra branch_reg;
114 struct { /* software */
115 struct hrtimer hrtimer;
117 struct { /* tracepoint */
118 /* for tp_event->class */
119 struct list_head tp_list;
121 struct { /* intel_cqm */
125 struct list_head cqm_events_entry;
126 struct list_head cqm_groups_entry;
127 struct list_head cqm_group_entry;
129 struct { /* itrace */
132 #ifdef CONFIG_HAVE_HW_BREAKPOINT
133 struct { /* breakpoint */
135 * Crufty hack to avoid the chicken and egg
136 * problem hw_breakpoint has with context
137 * creation and event initalization.
139 struct arch_hw_breakpoint info;
140 struct list_head bp_list;
145 * If the event is a per task event, this will point to the task in
146 * question. See the comment in perf_event_alloc().
148 struct task_struct *target;
151 * hw_perf_event::state flags; used to track the PERF_EF_* state.
153 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
154 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
155 #define PERF_HES_ARCH 0x04
160 * The last observed hardware counter value, updated with a
161 * local64_cmpxchg() such that pmu::read() can be called nested.
163 local64_t prev_count;
166 * The period to start the next sample with.
171 * The period we started this sample with.
176 * However much is left of the current period; note that this is
177 * a full 64bit value and allows for generation of periods longer
178 * than hardware might allow.
180 local64_t period_left;
183 * State for throttling the event, see __perf_event_overflow() and
184 * perf_adjust_freq_unthr_context().
190 * State for freq target events, see __perf_event_overflow() and
191 * perf_adjust_freq_unthr_context().
194 u64 freq_count_stamp;
201 * Common implementation detail of pmu::{start,commit,cancel}_txn
203 #define PERF_PMU_TXN_ADD 0x1 /* txn to add/schedule event on PMU */
204 #define PERF_PMU_TXN_READ 0x2 /* txn to read event group from PMU */
207 * pmu::capabilities flags
209 #define PERF_PMU_CAP_NO_INTERRUPT 0x01
210 #define PERF_PMU_CAP_NO_NMI 0x02
211 #define PERF_PMU_CAP_AUX_NO_SG 0x04
212 #define PERF_PMU_CAP_AUX_SW_DOUBLEBUF 0x08
213 #define PERF_PMU_CAP_EXCLUSIVE 0x10
214 #define PERF_PMU_CAP_ITRACE 0x20
217 * struct pmu - generic performance monitoring unit
220 struct list_head entry;
222 struct module *module;
224 const struct attribute_group **attr_groups;
229 * various common per-pmu feature flags
233 int * __percpu pmu_disable_count;
234 struct perf_cpu_context * __percpu pmu_cpu_context;
235 atomic_t exclusive_cnt; /* < 0: cpu; > 0: tsk */
237 int hrtimer_interval_ms;
240 * Fully disable/enable this PMU, can be used to protect from the PMI
241 * as well as for lazy/batch writing of the MSRs.
243 void (*pmu_enable) (struct pmu *pmu); /* optional */
244 void (*pmu_disable) (struct pmu *pmu); /* optional */
247 * Try and initialize the event for this PMU.
250 * -ENOENT -- @event is not for this PMU
252 * -ENODEV -- @event is for this PMU but PMU not present
253 * -EBUSY -- @event is for this PMU but PMU temporarily unavailable
254 * -EINVAL -- @event is for this PMU but @event is not valid
255 * -EOPNOTSUPP -- @event is for this PMU, @event is valid, but not supported
256 * -EACCESS -- @event is for this PMU, @event is valid, but no privilidges
258 * 0 -- @event is for this PMU and valid
260 * Other error return values are allowed.
262 int (*event_init) (struct perf_event *event);
265 * Notification that the event was mapped or unmapped. Called
266 * in the context of the mapping task.
268 void (*event_mapped) (struct perf_event *event); /*optional*/
269 void (*event_unmapped) (struct perf_event *event); /*optional*/
272 * Flags for ->add()/->del()/ ->start()/->stop(). There are
273 * matching hw_perf_event::state flags.
275 #define PERF_EF_START 0x01 /* start the counter when adding */
276 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
277 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
280 * Adds/Removes a counter to/from the PMU, can be done inside a
281 * transaction, see the ->*_txn() methods.
283 * The add/del callbacks will reserve all hardware resources required
284 * to service the event, this includes any counter constraint
287 * Called with IRQs disabled and the PMU disabled on the CPU the event
290 * ->add() called without PERF_EF_START should result in the same state
291 * as ->add() followed by ->stop().
293 * ->del() must always PERF_EF_UPDATE stop an event. If it calls
294 * ->stop() that must deal with already being stopped without
297 int (*add) (struct perf_event *event, int flags);
298 void (*del) (struct perf_event *event, int flags);
301 * Starts/Stops a counter present on the PMU.
303 * The PMI handler should stop the counter when perf_event_overflow()
304 * returns !0. ->start() will be used to continue.
306 * Also used to change the sample period.
308 * Called with IRQs disabled and the PMU disabled on the CPU the event
309 * is on -- will be called from NMI context with the PMU generates
312 * ->stop() with PERF_EF_UPDATE will read the counter and update
313 * period/count values like ->read() would.
315 * ->start() with PERF_EF_RELOAD will reprogram the the counter
316 * value, must be preceded by a ->stop() with PERF_EF_UPDATE.
318 void (*start) (struct perf_event *event, int flags);
319 void (*stop) (struct perf_event *event, int flags);
322 * Updates the counter value of the event.
324 * For sampling capable PMUs this will also update the software period
325 * hw_perf_event::period_left field.
327 void (*read) (struct perf_event *event);
330 * Group events scheduling is treated as a transaction, add
331 * group events as a whole and perform one schedulability test.
332 * If the test fails, roll back the whole group
334 * Start the transaction, after this ->add() doesn't need to
335 * do schedulability tests.
339 void (*start_txn) (struct pmu *pmu, unsigned int txn_flags);
341 * If ->start_txn() disabled the ->add() schedulability test
342 * then ->commit_txn() is required to perform one. On success
343 * the transaction is closed. On error the transaction is kept
344 * open until ->cancel_txn() is called.
348 int (*commit_txn) (struct pmu *pmu);
350 * Will cancel the transaction, assumes ->del() is called
351 * for each successful ->add() during the transaction.
355 void (*cancel_txn) (struct pmu *pmu);
358 * Will return the value for perf_event_mmap_page::index for this event,
359 * if no implementation is provided it will default to: event->hw.idx + 1.
361 int (*event_idx) (struct perf_event *event); /*optional */
364 * context-switches callback
366 void (*sched_task) (struct perf_event_context *ctx,
369 * PMU specific data size
371 size_t task_ctx_size;
375 * Return the count value for a counter.
377 u64 (*count) (struct perf_event *event); /*optional*/
380 * Set up pmu-private data structures for an AUX area
382 void *(*setup_aux) (struct perf_event *event, void **pages,
383 int nr_pages, bool overwrite);
387 * Free pmu-private AUX data structures
389 void (*free_aux) (void *aux); /* optional */
392 * Filter events for PMU-specific reasons.
394 int (*filter_match) (struct perf_event *event); /* optional */
397 * Initial, PMU driver specific configuration.
399 int (*get_drv_configs) (struct perf_event *event,
400 void __user *arg); /* optional */
401 void (*free_drv_configs) (struct perf_event *event);
406 * enum perf_event_active_state - the states of a event
408 enum perf_event_active_state {
409 PERF_EVENT_STATE_EXIT = -3,
410 PERF_EVENT_STATE_ERROR = -2,
411 PERF_EVENT_STATE_OFF = -1,
412 PERF_EVENT_STATE_INACTIVE = 0,
413 PERF_EVENT_STATE_ACTIVE = 1,
417 struct perf_sample_data;
419 typedef void (*perf_overflow_handler_t)(struct perf_event *,
420 struct perf_sample_data *,
421 struct pt_regs *regs);
423 enum perf_group_flag {
424 PERF_GROUP_SOFTWARE = 0x1,
427 #define SWEVENT_HLIST_BITS 8
428 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
430 struct swevent_hlist {
431 struct hlist_head heads[SWEVENT_HLIST_SIZE];
432 struct rcu_head rcu_head;
435 #define PERF_ATTACH_CONTEXT 0x01
436 #define PERF_ATTACH_GROUP 0x02
437 #define PERF_ATTACH_TASK 0x04
438 #define PERF_ATTACH_TASK_DATA 0x08
444 * struct perf_event - performance event kernel representation:
447 #ifdef CONFIG_PERF_EVENTS
449 * entry onto perf_event_context::event_list;
450 * modifications require ctx->lock
451 * RCU safe iterations.
453 struct list_head event_entry;
456 * XXX: group_entry and sibling_list should be mutually exclusive;
457 * either you're a sibling on a group, or you're the group leader.
458 * Rework the code to always use the same list element.
460 * Locked for modification by both ctx->mutex and ctx->lock; holding
461 * either sufficies for read.
463 struct list_head group_entry;
464 struct list_head sibling_list;
467 * We need storage to track the entries in perf_pmu_migrate_context; we
468 * cannot use the event_entry because of RCU and we want to keep the
469 * group in tact which avoids us using the other two entries.
471 struct list_head migrate_entry;
473 struct hlist_node hlist_entry;
474 struct list_head active_entry;
477 struct perf_event *group_leader;
480 enum perf_event_active_state state;
481 unsigned int attach_state;
483 atomic64_t child_count;
486 * These are the total time in nanoseconds that the event
487 * has been enabled (i.e. eligible to run, and the task has
488 * been scheduled in, if this is a per-task event)
489 * and running (scheduled onto the CPU), respectively.
491 * They are computed from tstamp_enabled, tstamp_running and
492 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
494 u64 total_time_enabled;
495 u64 total_time_running;
498 * These are timestamps used for computing total_time_enabled
499 * and total_time_running when the event is in INACTIVE or
500 * ACTIVE state, measured in nanoseconds from an arbitrary point
502 * tstamp_enabled: the notional time when the event was enabled
503 * tstamp_running: the notional time when the event was scheduled on
504 * tstamp_stopped: in INACTIVE state, the notional time when the
505 * event was scheduled off.
512 * timestamp shadows the actual context timing but it can
513 * be safely used in NMI interrupt context. It reflects the
514 * context time as it was when the event was last scheduled in.
516 * ctx_time already accounts for ctx->timestamp. Therefore to
517 * compute ctx_time for a sample, simply add perf_clock().
521 struct perf_event_attr attr;
525 struct hw_perf_event hw;
527 struct perf_event_context *ctx;
528 atomic_long_t refcount;
531 * These accumulate total time (in nanoseconds) that children
532 * events have been enabled and running, respectively.
534 atomic64_t child_total_time_enabled;
535 atomic64_t child_total_time_running;
538 * Protect attach/detach and child_list:
540 struct mutex child_mutex;
541 struct list_head child_list;
542 struct perf_event *parent;
547 struct list_head owner_entry;
548 struct task_struct *owner;
551 struct mutex mmap_mutex;
554 struct ring_buffer *rb;
555 struct list_head rb_entry;
556 unsigned long rcu_batches;
560 wait_queue_head_t waitq;
561 struct fasync_struct *fasync;
563 /* delayed work for NMIs and such */
567 struct irq_work pending;
569 atomic_t event_limit;
570 struct list_head drv_configs;
572 void (*destroy)(struct perf_event *);
573 struct rcu_head rcu_head;
575 struct pid_namespace *ns;
579 perf_overflow_handler_t overflow_handler;
580 void *overflow_handler_context;
582 #ifdef CONFIG_EVENT_TRACING
583 struct trace_event_call *tp_event;
584 struct event_filter *filter;
585 #ifdef CONFIG_FUNCTION_TRACER
586 struct ftrace_ops ftrace_ops;
590 #ifdef CONFIG_CGROUP_PERF
591 struct perf_cgroup *cgrp; /* cgroup event is attach to */
592 int cgrp_defer_enabled;
595 #endif /* CONFIG_PERF_EVENTS */
599 * struct perf_event_context - event context structure
601 * Used as a container for task events and CPU events as well:
603 struct perf_event_context {
606 * Protect the states of the events in the list,
607 * nr_active, and the list:
611 * Protect the list of events. Locking either mutex or lock
612 * is sufficient to ensure the list doesn't change; to change
613 * the list you need to lock both the mutex and the spinlock.
617 struct list_head active_ctx_list;
618 struct list_head pinned_groups;
619 struct list_head flexible_groups;
620 struct list_head event_list;
628 struct task_struct *task;
631 * Context clock, runs when context enabled.
637 * These fields let us detect when two contexts have both
638 * been cloned (inherited) from a common ancestor.
640 struct perf_event_context *parent_ctx;
644 int nr_cgroups; /* cgroup evts */
645 void *task_ctx_data; /* pmu specific data */
646 struct rcu_head rcu_head;
648 struct delayed_work orphans_remove;
649 bool orphans_remove_sched;
653 * Number of contexts where an event can trigger:
654 * task, softirq, hardirq, nmi.
656 #define PERF_NR_CONTEXTS 4
659 * struct perf_event_cpu_context - per cpu event context structure
661 struct perf_cpu_context {
662 struct perf_event_context ctx;
663 struct perf_event_context *task_ctx;
667 raw_spinlock_t hrtimer_lock;
668 struct hrtimer hrtimer;
669 ktime_t hrtimer_interval;
670 unsigned int hrtimer_active;
672 struct pmu *unique_pmu;
673 struct perf_cgroup *cgrp;
676 struct perf_output_handle {
677 struct perf_event *event;
678 struct ring_buffer *rb;
679 unsigned long wakeup;
688 #ifdef CONFIG_CGROUP_PERF
691 * perf_cgroup_info keeps track of time_enabled for a cgroup.
692 * This is a per-cpu dynamically allocated data structure.
694 struct perf_cgroup_info {
700 struct cgroup_subsys_state css;
701 struct perf_cgroup_info __percpu *info;
705 * Must ensure cgroup is pinned (css_get) before calling
706 * this function. In other words, we cannot call this function
707 * if there is no cgroup event for the current CPU context.
709 static inline struct perf_cgroup *
710 perf_cgroup_from_task(struct task_struct *task, struct perf_event_context *ctx)
712 return container_of(task_css_check(task, perf_event_cgrp_id,
713 ctx ? lockdep_is_held(&ctx->lock)
715 struct perf_cgroup, css);
717 #endif /* CONFIG_CGROUP_PERF */
719 #ifdef CONFIG_PERF_EVENTS
721 extern void *perf_aux_output_begin(struct perf_output_handle *handle,
722 struct perf_event *event);
723 extern void perf_aux_output_end(struct perf_output_handle *handle,
724 unsigned long size, bool truncated);
725 extern int perf_aux_output_skip(struct perf_output_handle *handle,
727 extern void *perf_get_aux(struct perf_output_handle *handle);
729 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
730 extern void perf_pmu_unregister(struct pmu *pmu);
732 extern int perf_num_counters(void);
733 extern const char *perf_pmu_name(void);
734 extern void __perf_event_task_sched_in(struct task_struct *prev,
735 struct task_struct *task);
736 extern void __perf_event_task_sched_out(struct task_struct *prev,
737 struct task_struct *next);
738 extern int perf_event_init_task(struct task_struct *child);
739 extern void perf_event_exit_task(struct task_struct *child);
740 extern void perf_event_free_task(struct task_struct *task);
741 extern void perf_event_delayed_put(struct task_struct *task);
742 extern struct perf_event *perf_event_get(unsigned int fd);
743 extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event);
744 extern void perf_event_print_debug(void);
745 extern void perf_pmu_disable(struct pmu *pmu);
746 extern void perf_pmu_enable(struct pmu *pmu);
747 extern void perf_sched_cb_dec(struct pmu *pmu);
748 extern void perf_sched_cb_inc(struct pmu *pmu);
749 extern int perf_event_task_disable(void);
750 extern int perf_event_task_enable(void);
751 extern int perf_event_refresh(struct perf_event *event, int refresh);
752 extern void perf_event_update_userpage(struct perf_event *event);
753 extern int perf_event_release_kernel(struct perf_event *event);
754 extern struct perf_event *
755 perf_event_create_kernel_counter(struct perf_event_attr *attr,
757 struct task_struct *task,
758 perf_overflow_handler_t callback,
760 extern void perf_pmu_migrate_context(struct pmu *pmu,
761 int src_cpu, int dst_cpu);
762 extern u64 perf_event_read_local(struct perf_event *event);
763 extern u64 perf_event_read_value(struct perf_event *event,
764 u64 *enabled, u64 *running);
767 struct perf_sample_data {
769 * Fields set by perf_sample_data_init(), group so as to
770 * minimize the cachelines touched.
773 struct perf_raw_record *raw;
774 struct perf_branch_stack *br_stack;
778 union perf_mem_data_src data_src;
781 * The other fields, optionally {set,used} by
782 * perf_{prepare,output}_sample().
797 struct perf_callchain_entry *callchain;
800 * regs_user may point to task_pt_regs or to regs_user_copy, depending
803 struct perf_regs regs_user;
804 struct pt_regs regs_user_copy;
806 struct perf_regs regs_intr;
808 } ____cacheline_aligned;
810 /* default value for data source */
811 #define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\
812 PERF_MEM_S(LVL, NA) |\
813 PERF_MEM_S(SNOOP, NA) |\
814 PERF_MEM_S(LOCK, NA) |\
817 static inline void perf_sample_data_init(struct perf_sample_data *data,
818 u64 addr, u64 period)
820 /* remaining struct members initialized in perf_prepare_sample() */
823 data->br_stack = NULL;
824 data->period = period;
826 data->data_src.val = PERF_MEM_NA;
830 extern void perf_output_sample(struct perf_output_handle *handle,
831 struct perf_event_header *header,
832 struct perf_sample_data *data,
833 struct perf_event *event);
834 extern void perf_prepare_sample(struct perf_event_header *header,
835 struct perf_sample_data *data,
836 struct perf_event *event,
837 struct pt_regs *regs);
839 extern int perf_event_overflow(struct perf_event *event,
840 struct perf_sample_data *data,
841 struct pt_regs *regs);
843 extern void perf_event_output(struct perf_event *event,
844 struct perf_sample_data *data,
845 struct pt_regs *regs);
848 perf_event_header__init_id(struct perf_event_header *header,
849 struct perf_sample_data *data,
850 struct perf_event *event);
852 perf_event__output_id_sample(struct perf_event *event,
853 struct perf_output_handle *handle,
854 struct perf_sample_data *sample);
857 perf_log_lost_samples(struct perf_event *event, u64 lost);
859 static inline bool is_sampling_event(struct perf_event *event)
861 return event->attr.sample_period != 0;
865 * Return 1 for a software event, 0 for a hardware event
867 static inline int is_software_event(struct perf_event *event)
869 return event->pmu->task_ctx_nr == perf_sw_context;
872 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
874 extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64);
875 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
877 #ifndef perf_arch_fetch_caller_regs
878 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
882 * Take a snapshot of the regs. Skip ip and frame pointer to
883 * the nth caller. We only need a few of the regs:
884 * - ip for PERF_SAMPLE_IP
885 * - cs for user_mode() tests
886 * - bp for callchains
887 * - eflags, for future purposes, just in case
889 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
891 memset(regs, 0, sizeof(*regs));
893 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
896 static __always_inline void
897 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
899 if (static_key_false(&perf_swevent_enabled[event_id]))
900 __perf_sw_event(event_id, nr, regs, addr);
903 DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]);
906 * 'Special' version for the scheduler, it hard assumes no recursion,
907 * which is guaranteed by us not actually scheduling inside other swevents
908 * because those disable preemption.
910 static __always_inline void
911 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)
913 if (static_key_false(&perf_swevent_enabled[event_id])) {
914 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
916 perf_fetch_caller_regs(regs);
917 ___perf_sw_event(event_id, nr, regs, addr);
921 extern struct static_key_deferred perf_sched_events;
923 static __always_inline bool
924 perf_sw_migrate_enabled(void)
926 if (static_key_false(&perf_swevent_enabled[PERF_COUNT_SW_CPU_MIGRATIONS]))
931 static inline void perf_event_task_migrate(struct task_struct *task)
933 if (perf_sw_migrate_enabled())
934 task->sched_migrated = 1;
937 static inline void perf_event_task_sched_in(struct task_struct *prev,
938 struct task_struct *task)
940 if (static_key_false(&perf_sched_events.key))
941 __perf_event_task_sched_in(prev, task);
943 if (perf_sw_migrate_enabled() && task->sched_migrated) {
944 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
946 perf_fetch_caller_regs(regs);
947 ___perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, regs, 0);
948 task->sched_migrated = 0;
952 static inline void perf_event_task_sched_out(struct task_struct *prev,
953 struct task_struct *next)
955 perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);
957 if (static_key_false(&perf_sched_events.key))
958 __perf_event_task_sched_out(prev, next);
961 static inline u64 __perf_event_count(struct perf_event *event)
963 return local64_read(&event->count) + atomic64_read(&event->child_count);
966 extern void perf_event_mmap(struct vm_area_struct *vma);
967 extern struct perf_guest_info_callbacks *perf_guest_cbs;
968 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
969 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
971 extern void perf_event_exec(void);
972 extern void perf_event_comm(struct task_struct *tsk, bool exec);
973 extern void perf_event_fork(struct task_struct *tsk);
976 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
978 extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
979 extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
981 static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
983 if (entry->nr < PERF_MAX_STACK_DEPTH)
984 entry->ip[entry->nr++] = ip;
987 extern int sysctl_perf_event_paranoid;
988 extern int sysctl_perf_event_mlock;
989 extern int sysctl_perf_event_sample_rate;
990 extern int sysctl_perf_cpu_time_max_percent;
992 extern void perf_sample_event_took(u64 sample_len_ns);
994 extern int perf_proc_update_handler(struct ctl_table *table, int write,
995 void __user *buffer, size_t *lenp,
997 extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
998 void __user *buffer, size_t *lenp,
1002 static inline bool perf_paranoid_any(void)
1004 return sysctl_perf_event_paranoid > 2;
1007 static inline bool perf_paranoid_tracepoint_raw(void)
1009 return sysctl_perf_event_paranoid > -1;
1012 static inline bool perf_paranoid_cpu(void)
1014 return sysctl_perf_event_paranoid > 0;
1017 static inline bool perf_paranoid_kernel(void)
1019 return sysctl_perf_event_paranoid > 1;
1022 extern void perf_event_init(void);
1023 extern void perf_tp_event(u64 addr, u64 count, void *record,
1024 int entry_size, struct pt_regs *regs,
1025 struct hlist_head *head, int rctx,
1026 struct task_struct *task);
1027 extern void perf_bp_event(struct perf_event *event, void *data);
1029 #ifndef perf_misc_flags
1030 # define perf_misc_flags(regs) \
1031 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
1032 # define perf_instruction_pointer(regs) instruction_pointer(regs)
1035 static inline bool has_branch_stack(struct perf_event *event)
1037 return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
1040 static inline bool needs_branch_stack(struct perf_event *event)
1042 return event->attr.branch_sample_type != 0;
1045 static inline bool has_aux(struct perf_event *event)
1047 return event->pmu->setup_aux;
1050 extern int perf_output_begin(struct perf_output_handle *handle,
1051 struct perf_event *event, unsigned int size);
1052 extern void perf_output_end(struct perf_output_handle *handle);
1053 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
1054 const void *buf, unsigned int len);
1055 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
1057 extern int perf_swevent_get_recursion_context(void);
1058 extern void perf_swevent_put_recursion_context(int rctx);
1059 extern u64 perf_swevent_set_period(struct perf_event *event);
1060 extern void perf_event_enable(struct perf_event *event);
1061 extern void perf_event_disable(struct perf_event *event);
1062 extern int __perf_event_disable(void *info);
1063 extern void perf_event_task_tick(void);
1064 #else /* !CONFIG_PERF_EVENTS: */
1065 static inline void *
1066 perf_aux_output_begin(struct perf_output_handle *handle,
1067 struct perf_event *event) { return NULL; }
1069 perf_aux_output_end(struct perf_output_handle *handle, unsigned long size,
1072 perf_aux_output_skip(struct perf_output_handle *handle,
1073 unsigned long size) { return -EINVAL; }
1074 static inline void *
1075 perf_get_aux(struct perf_output_handle *handle) { return NULL; }
1077 perf_event_task_migrate(struct task_struct *task) { }
1079 perf_event_task_sched_in(struct task_struct *prev,
1080 struct task_struct *task) { }
1082 perf_event_task_sched_out(struct task_struct *prev,
1083 struct task_struct *next) { }
1084 static inline int perf_event_init_task(struct task_struct *child) { return 0; }
1085 static inline void perf_event_exit_task(struct task_struct *child) { }
1086 static inline void perf_event_free_task(struct task_struct *task) { }
1087 static inline void perf_event_delayed_put(struct task_struct *task) { }
1088 static inline struct perf_event *perf_event_get(unsigned int fd) { return ERR_PTR(-EINVAL); }
1089 static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event)
1091 return ERR_PTR(-EINVAL);
1093 static inline u64 perf_event_read_local(struct perf_event *event) { return -EINVAL; }
1094 static inline void perf_event_print_debug(void) { }
1095 static inline int perf_event_task_disable(void) { return -EINVAL; }
1096 static inline int perf_event_task_enable(void) { return -EINVAL; }
1097 static inline int perf_event_refresh(struct perf_event *event, int refresh)
1103 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
1105 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) { }
1107 perf_bp_event(struct perf_event *event, void *data) { }
1109 static inline int perf_register_guest_info_callbacks
1110 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1111 static inline int perf_unregister_guest_info_callbacks
1112 (struct perf_guest_info_callbacks *callbacks) { return 0; }
1114 static inline void perf_event_mmap(struct vm_area_struct *vma) { }
1115 static inline void perf_event_exec(void) { }
1116 static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
1117 static inline void perf_event_fork(struct task_struct *tsk) { }
1118 static inline void perf_event_init(void) { }
1119 static inline int perf_swevent_get_recursion_context(void) { return -1; }
1120 static inline void perf_swevent_put_recursion_context(int rctx) { }
1121 static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; }
1122 static inline void perf_event_enable(struct perf_event *event) { }
1123 static inline void perf_event_disable(struct perf_event *event) { }
1124 static inline int __perf_event_disable(void *info) { return -1; }
1125 static inline void perf_event_task_tick(void) { }
1126 static inline int perf_event_release_kernel(struct perf_event *event) { return 0; }
1129 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
1130 extern bool perf_event_can_stop_tick(void);
1132 static inline bool perf_event_can_stop_tick(void) { return true; }
1135 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
1136 extern void perf_restore_debug_store(void);
1138 static inline void perf_restore_debug_store(void) { }
1141 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
1144 * This has to have a higher priority than migration_notifier in sched/core.c.
1146 #define perf_cpu_notifier(fn) \
1148 static struct notifier_block fn##_nb = \
1149 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
1150 unsigned long cpu = smp_processor_id(); \
1151 unsigned long flags; \
1153 cpu_notifier_register_begin(); \
1154 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
1155 (void *)(unsigned long)cpu); \
1156 local_irq_save(flags); \
1157 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
1158 (void *)(unsigned long)cpu); \
1159 local_irq_restore(flags); \
1160 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
1161 (void *)(unsigned long)cpu); \
1162 __register_cpu_notifier(&fn##_nb); \
1163 cpu_notifier_register_done(); \
1167 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
1168 * callback for already online CPUs.
1170 #define __perf_cpu_notifier(fn) \
1172 static struct notifier_block fn##_nb = \
1173 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
1175 __register_cpu_notifier(&fn##_nb); \
1178 struct perf_pmu_events_attr {
1179 struct device_attribute attr;
1181 const char *event_str;
1184 ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
1187 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
1188 static struct perf_pmu_events_attr _var = { \
1189 .attr = __ATTR(_name, 0444, _show, NULL), \
1193 #define PMU_EVENT_ATTR_STRING(_name, _var, _str) \
1194 static struct perf_pmu_events_attr _var = { \
1195 .attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \
1197 .event_str = _str, \
1200 #define PMU_FORMAT_ATTR(_name, _format) \
1202 _name##_show(struct device *dev, \
1203 struct device_attribute *attr, \
1206 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
1207 return sprintf(page, _format "\n"); \
1210 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
1212 #endif /* _LINUX_PERF_EVENT_H */