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[] */
95 struct event_constraint
;
98 * struct hw_perf_event - performance event hardware details:
100 struct hw_perf_event
{
101 #ifdef CONFIG_PERF_EVENTS
103 struct { /* hardware */
106 unsigned long config_base
;
107 unsigned long event_base
;
108 int event_base_rdpmc
;
113 struct hw_perf_event_extra extra_reg
;
114 struct hw_perf_event_extra branch_reg
;
116 struct event_constraint
*constraint
;
118 struct { /* software */
119 struct hrtimer hrtimer
;
121 struct { /* tracepoint */
122 /* for tp_event->class */
123 struct list_head tp_list
;
125 struct { /* intel_cqm */
128 struct list_head cqm_events_entry
;
129 struct list_head cqm_groups_entry
;
130 struct list_head cqm_group_entry
;
132 struct { /* itrace */
135 #ifdef CONFIG_HAVE_HW_BREAKPOINT
136 struct { /* breakpoint */
138 * Crufty hack to avoid the chicken and egg
139 * problem hw_breakpoint has with context
140 * creation and event initalization.
142 struct arch_hw_breakpoint info
;
143 struct list_head bp_list
;
147 struct task_struct
*target
;
149 local64_t prev_count
;
152 local64_t period_left
;
157 u64 freq_count_stamp
;
162 * hw_perf_event::state flags
164 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
165 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
166 #define PERF_HES_ARCH 0x04
171 * Common implementation detail of pmu::{start,commit,cancel}_txn
173 #define PERF_EVENT_TXN 0x1
176 * pmu::capabilities flags
178 #define PERF_PMU_CAP_NO_INTERRUPT 0x01
179 #define PERF_PMU_CAP_NO_NMI 0x02
180 #define PERF_PMU_CAP_AUX_NO_SG 0x04
181 #define PERF_PMU_CAP_AUX_SW_DOUBLEBUF 0x08
182 #define PERF_PMU_CAP_EXCLUSIVE 0x10
183 #define PERF_PMU_CAP_ITRACE 0x20
186 * struct pmu - generic performance monitoring unit
189 struct list_head entry
;
191 struct module
*module
;
193 const struct attribute_group
**attr_groups
;
198 * various common per-pmu feature flags
202 int * __percpu pmu_disable_count
;
203 struct perf_cpu_context
* __percpu pmu_cpu_context
;
204 atomic_t exclusive_cnt
; /* < 0: cpu; > 0: tsk */
206 int hrtimer_interval_ms
;
209 * Fully disable/enable this PMU, can be used to protect from the PMI
210 * as well as for lazy/batch writing of the MSRs.
212 void (*pmu_enable
) (struct pmu
*pmu
); /* optional */
213 void (*pmu_disable
) (struct pmu
*pmu
); /* optional */
216 * Try and initialize the event for this PMU.
217 * Should return -ENOENT when the @event doesn't match this PMU.
219 int (*event_init
) (struct perf_event
*event
);
222 * Notification that the event was mapped or unmapped. Called
223 * in the context of the mapping task.
225 void (*event_mapped
) (struct perf_event
*event
); /*optional*/
226 void (*event_unmapped
) (struct perf_event
*event
); /*optional*/
228 #define PERF_EF_START 0x01 /* start the counter when adding */
229 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
230 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
233 * Adds/Removes a counter to/from the PMU, can be done inside
234 * a transaction, see the ->*_txn() methods.
236 int (*add
) (struct perf_event
*event
, int flags
);
237 void (*del
) (struct perf_event
*event
, int flags
);
240 * Starts/Stops a counter present on the PMU. The PMI handler
241 * should stop the counter when perf_event_overflow() returns
242 * !0. ->start() will be used to continue.
244 void (*start
) (struct perf_event
*event
, int flags
);
245 void (*stop
) (struct perf_event
*event
, int flags
);
248 * Updates the counter value of the event.
250 void (*read
) (struct perf_event
*event
);
253 * Group events scheduling is treated as a transaction, add
254 * group events as a whole and perform one schedulability test.
255 * If the test fails, roll back the whole group
257 * Start the transaction, after this ->add() doesn't need to
258 * do schedulability tests.
260 void (*start_txn
) (struct pmu
*pmu
); /* optional */
262 * If ->start_txn() disabled the ->add() schedulability test
263 * then ->commit_txn() is required to perform one. On success
264 * the transaction is closed. On error the transaction is kept
265 * open until ->cancel_txn() is called.
267 int (*commit_txn
) (struct pmu
*pmu
); /* optional */
269 * Will cancel the transaction, assumes ->del() is called
270 * for each successful ->add() during the transaction.
272 void (*cancel_txn
) (struct pmu
*pmu
); /* optional */
275 * Will return the value for perf_event_mmap_page::index for this event,
276 * if no implementation is provided it will default to: event->hw.idx + 1.
278 int (*event_idx
) (struct perf_event
*event
); /*optional */
281 * context-switches callback
283 void (*sched_task
) (struct perf_event_context
*ctx
,
286 * PMU specific data size
288 size_t task_ctx_size
;
292 * Return the count value for a counter.
294 u64 (*count
) (struct perf_event
*event
); /*optional*/
297 * Set up pmu-private data structures for an AUX area
299 void *(*setup_aux
) (int cpu
, void **pages
,
300 int nr_pages
, bool overwrite
);
304 * Free pmu-private AUX data structures
306 void (*free_aux
) (void *aux
); /* optional */
310 * enum perf_event_active_state - the states of a event
312 enum perf_event_active_state
{
313 PERF_EVENT_STATE_EXIT
= -3,
314 PERF_EVENT_STATE_ERROR
= -2,
315 PERF_EVENT_STATE_OFF
= -1,
316 PERF_EVENT_STATE_INACTIVE
= 0,
317 PERF_EVENT_STATE_ACTIVE
= 1,
321 struct perf_sample_data
;
323 typedef void (*perf_overflow_handler_t
)(struct perf_event
*,
324 struct perf_sample_data
*,
325 struct pt_regs
*regs
);
327 enum perf_group_flag
{
328 PERF_GROUP_SOFTWARE
= 0x1,
331 #define SWEVENT_HLIST_BITS 8
332 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
334 struct swevent_hlist
{
335 struct hlist_head heads
[SWEVENT_HLIST_SIZE
];
336 struct rcu_head rcu_head
;
339 #define PERF_ATTACH_CONTEXT 0x01
340 #define PERF_ATTACH_GROUP 0x02
341 #define PERF_ATTACH_TASK 0x04
342 #define PERF_ATTACH_TASK_DATA 0x08
348 * struct perf_event - performance event kernel representation:
351 #ifdef CONFIG_PERF_EVENTS
353 * entry onto perf_event_context::event_list;
354 * modifications require ctx->lock
355 * RCU safe iterations.
357 struct list_head event_entry
;
360 * XXX: group_entry and sibling_list should be mutually exclusive;
361 * either you're a sibling on a group, or you're the group leader.
362 * Rework the code to always use the same list element.
364 * Locked for modification by both ctx->mutex and ctx->lock; holding
365 * either sufficies for read.
367 struct list_head group_entry
;
368 struct list_head sibling_list
;
371 * We need storage to track the entries in perf_pmu_migrate_context; we
372 * cannot use the event_entry because of RCU and we want to keep the
373 * group in tact which avoids us using the other two entries.
375 struct list_head migrate_entry
;
377 struct hlist_node hlist_entry
;
378 struct list_head active_entry
;
381 struct perf_event
*group_leader
;
384 enum perf_event_active_state state
;
385 unsigned int attach_state
;
387 atomic64_t child_count
;
390 * These are the total time in nanoseconds that the event
391 * has been enabled (i.e. eligible to run, and the task has
392 * been scheduled in, if this is a per-task event)
393 * and running (scheduled onto the CPU), respectively.
395 * They are computed from tstamp_enabled, tstamp_running and
396 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
398 u64 total_time_enabled
;
399 u64 total_time_running
;
402 * These are timestamps used for computing total_time_enabled
403 * and total_time_running when the event is in INACTIVE or
404 * ACTIVE state, measured in nanoseconds from an arbitrary point
406 * tstamp_enabled: the notional time when the event was enabled
407 * tstamp_running: the notional time when the event was scheduled on
408 * tstamp_stopped: in INACTIVE state, the notional time when the
409 * event was scheduled off.
416 * timestamp shadows the actual context timing but it can
417 * be safely used in NMI interrupt context. It reflects the
418 * context time as it was when the event was last scheduled in.
420 * ctx_time already accounts for ctx->timestamp. Therefore to
421 * compute ctx_time for a sample, simply add perf_clock().
425 struct perf_event_attr attr
;
429 struct hw_perf_event hw
;
431 struct perf_event_context
*ctx
;
432 atomic_long_t refcount
;
435 * These accumulate total time (in nanoseconds) that children
436 * events have been enabled and running, respectively.
438 atomic64_t child_total_time_enabled
;
439 atomic64_t child_total_time_running
;
442 * Protect attach/detach and child_list:
444 struct mutex child_mutex
;
445 struct list_head child_list
;
446 struct perf_event
*parent
;
451 struct list_head owner_entry
;
452 struct task_struct
*owner
;
455 struct mutex mmap_mutex
;
458 struct ring_buffer
*rb
;
459 struct list_head rb_entry
;
460 unsigned long rcu_batches
;
464 wait_queue_head_t waitq
;
465 struct fasync_struct
*fasync
;
467 /* delayed work for NMIs and such */
471 struct irq_work pending
;
473 atomic_t event_limit
;
475 void (*destroy
)(struct perf_event
*);
476 struct rcu_head rcu_head
;
478 struct pid_namespace
*ns
;
482 perf_overflow_handler_t overflow_handler
;
483 void *overflow_handler_context
;
485 #ifdef CONFIG_EVENT_TRACING
486 struct ftrace_event_call
*tp_event
;
487 struct event_filter
*filter
;
488 #ifdef CONFIG_FUNCTION_TRACER
489 struct ftrace_ops ftrace_ops
;
493 #ifdef CONFIG_CGROUP_PERF
494 struct perf_cgroup
*cgrp
; /* cgroup event is attach to */
495 int cgrp_defer_enabled
;
498 #endif /* CONFIG_PERF_EVENTS */
502 * struct perf_event_context - event context structure
504 * Used as a container for task events and CPU events as well:
506 struct perf_event_context
{
509 * Protect the states of the events in the list,
510 * nr_active, and the list:
514 * Protect the list of events. Locking either mutex or lock
515 * is sufficient to ensure the list doesn't change; to change
516 * the list you need to lock both the mutex and the spinlock.
520 struct list_head active_ctx_list
;
521 struct list_head pinned_groups
;
522 struct list_head flexible_groups
;
523 struct list_head event_list
;
531 struct task_struct
*task
;
534 * Context clock, runs when context enabled.
540 * These fields let us detect when two contexts have both
541 * been cloned (inherited) from a common ancestor.
543 struct perf_event_context
*parent_ctx
;
547 int nr_cgroups
; /* cgroup evts */
548 void *task_ctx_data
; /* pmu specific data */
549 struct rcu_head rcu_head
;
551 struct delayed_work orphans_remove
;
552 bool orphans_remove_sched
;
556 * Number of contexts where an event can trigger:
557 * task, softirq, hardirq, nmi.
559 #define PERF_NR_CONTEXTS 4
562 * struct perf_event_cpu_context - per cpu event context structure
564 struct perf_cpu_context
{
565 struct perf_event_context ctx
;
566 struct perf_event_context
*task_ctx
;
569 struct hrtimer hrtimer
;
570 ktime_t hrtimer_interval
;
571 struct pmu
*unique_pmu
;
572 struct perf_cgroup
*cgrp
;
575 struct perf_output_handle
{
576 struct perf_event
*event
;
577 struct ring_buffer
*rb
;
578 unsigned long wakeup
;
587 #ifdef CONFIG_CGROUP_PERF
590 * perf_cgroup_info keeps track of time_enabled for a cgroup.
591 * This is a per-cpu dynamically allocated data structure.
593 struct perf_cgroup_info
{
599 struct cgroup_subsys_state css
;
600 struct perf_cgroup_info __percpu
*info
;
604 * Must ensure cgroup is pinned (css_get) before calling
605 * this function. In other words, we cannot call this function
606 * if there is no cgroup event for the current CPU context.
608 static inline struct perf_cgroup
*
609 perf_cgroup_from_task(struct task_struct
*task
)
611 return container_of(task_css(task
, perf_event_cgrp_id
),
612 struct perf_cgroup
, css
);
614 #endif /* CONFIG_CGROUP_PERF */
616 #ifdef CONFIG_PERF_EVENTS
618 extern void *perf_aux_output_begin(struct perf_output_handle
*handle
,
619 struct perf_event
*event
);
620 extern void perf_aux_output_end(struct perf_output_handle
*handle
,
621 unsigned long size
, bool truncated
);
622 extern int perf_aux_output_skip(struct perf_output_handle
*handle
,
624 extern void *perf_get_aux(struct perf_output_handle
*handle
);
626 extern int perf_pmu_register(struct pmu
*pmu
, const char *name
, int type
);
627 extern void perf_pmu_unregister(struct pmu
*pmu
);
629 extern int perf_num_counters(void);
630 extern const char *perf_pmu_name(void);
631 extern void __perf_event_task_sched_in(struct task_struct
*prev
,
632 struct task_struct
*task
);
633 extern void __perf_event_task_sched_out(struct task_struct
*prev
,
634 struct task_struct
*next
);
635 extern int perf_event_init_task(struct task_struct
*child
);
636 extern void perf_event_exit_task(struct task_struct
*child
);
637 extern void perf_event_free_task(struct task_struct
*task
);
638 extern void perf_event_delayed_put(struct task_struct
*task
);
639 extern void perf_event_print_debug(void);
640 extern void perf_pmu_disable(struct pmu
*pmu
);
641 extern void perf_pmu_enable(struct pmu
*pmu
);
642 extern void perf_sched_cb_dec(struct pmu
*pmu
);
643 extern void perf_sched_cb_inc(struct pmu
*pmu
);
644 extern int perf_event_task_disable(void);
645 extern int perf_event_task_enable(void);
646 extern int perf_event_refresh(struct perf_event
*event
, int refresh
);
647 extern void perf_event_update_userpage(struct perf_event
*event
);
648 extern int perf_event_release_kernel(struct perf_event
*event
);
649 extern struct perf_event
*
650 perf_event_create_kernel_counter(struct perf_event_attr
*attr
,
652 struct task_struct
*task
,
653 perf_overflow_handler_t callback
,
655 extern void perf_pmu_migrate_context(struct pmu
*pmu
,
656 int src_cpu
, int dst_cpu
);
657 extern u64
perf_event_read_value(struct perf_event
*event
,
658 u64
*enabled
, u64
*running
);
661 struct perf_sample_data
{
663 * Fields set by perf_sample_data_init(), group so as to
664 * minimize the cachelines touched.
667 struct perf_raw_record
*raw
;
668 struct perf_branch_stack
*br_stack
;
672 union perf_mem_data_src data_src
;
675 * The other fields, optionally {set,used} by
676 * perf_{prepare,output}_sample().
691 struct perf_callchain_entry
*callchain
;
694 * regs_user may point to task_pt_regs or to regs_user_copy, depending
697 struct perf_regs regs_user
;
698 struct pt_regs regs_user_copy
;
700 struct perf_regs regs_intr
;
702 } ____cacheline_aligned
;
704 /* default value for data source */
705 #define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\
706 PERF_MEM_S(LVL, NA) |\
707 PERF_MEM_S(SNOOP, NA) |\
708 PERF_MEM_S(LOCK, NA) |\
711 static inline void perf_sample_data_init(struct perf_sample_data
*data
,
712 u64 addr
, u64 period
)
714 /* remaining struct members initialized in perf_prepare_sample() */
717 data
->br_stack
= NULL
;
718 data
->period
= period
;
720 data
->data_src
.val
= PERF_MEM_NA
;
724 extern void perf_output_sample(struct perf_output_handle
*handle
,
725 struct perf_event_header
*header
,
726 struct perf_sample_data
*data
,
727 struct perf_event
*event
);
728 extern void perf_prepare_sample(struct perf_event_header
*header
,
729 struct perf_sample_data
*data
,
730 struct perf_event
*event
,
731 struct pt_regs
*regs
);
733 extern int perf_event_overflow(struct perf_event
*event
,
734 struct perf_sample_data
*data
,
735 struct pt_regs
*regs
);
737 static inline bool is_sampling_event(struct perf_event
*event
)
739 return event
->attr
.sample_period
!= 0;
743 * Return 1 for a software event, 0 for a hardware event
745 static inline int is_software_event(struct perf_event
*event
)
747 return event
->pmu
->task_ctx_nr
== perf_sw_context
;
750 extern struct static_key perf_swevent_enabled
[PERF_COUNT_SW_MAX
];
752 extern void ___perf_sw_event(u32
, u64
, struct pt_regs
*, u64
);
753 extern void __perf_sw_event(u32
, u64
, struct pt_regs
*, u64
);
755 #ifndef perf_arch_fetch_caller_regs
756 static inline void perf_arch_fetch_caller_regs(struct pt_regs
*regs
, unsigned long ip
) { }
760 * Take a snapshot of the regs. Skip ip and frame pointer to
761 * the nth caller. We only need a few of the regs:
762 * - ip for PERF_SAMPLE_IP
763 * - cs for user_mode() tests
764 * - bp for callchains
765 * - eflags, for future purposes, just in case
767 static inline void perf_fetch_caller_regs(struct pt_regs
*regs
)
769 memset(regs
, 0, sizeof(*regs
));
771 perf_arch_fetch_caller_regs(regs
, CALLER_ADDR0
);
774 static __always_inline
void
775 perf_sw_event(u32 event_id
, u64 nr
, struct pt_regs
*regs
, u64 addr
)
777 if (static_key_false(&perf_swevent_enabled
[event_id
]))
778 __perf_sw_event(event_id
, nr
, regs
, addr
);
781 DECLARE_PER_CPU(struct pt_regs
, __perf_regs
[4]);
784 * 'Special' version for the scheduler, it hard assumes no recursion,
785 * which is guaranteed by us not actually scheduling inside other swevents
786 * because those disable preemption.
788 static __always_inline
void
789 perf_sw_event_sched(u32 event_id
, u64 nr
, u64 addr
)
791 if (static_key_false(&perf_swevent_enabled
[event_id
])) {
792 struct pt_regs
*regs
= this_cpu_ptr(&__perf_regs
[0]);
794 perf_fetch_caller_regs(regs
);
795 ___perf_sw_event(event_id
, nr
, regs
, addr
);
799 extern struct static_key_deferred perf_sched_events
;
801 static inline void perf_event_task_sched_in(struct task_struct
*prev
,
802 struct task_struct
*task
)
804 if (static_key_false(&perf_sched_events
.key
))
805 __perf_event_task_sched_in(prev
, task
);
808 static inline void perf_event_task_sched_out(struct task_struct
*prev
,
809 struct task_struct
*next
)
811 perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES
, 1, 0);
813 if (static_key_false(&perf_sched_events
.key
))
814 __perf_event_task_sched_out(prev
, next
);
817 static inline u64
__perf_event_count(struct perf_event
*event
)
819 return local64_read(&event
->count
) + atomic64_read(&event
->child_count
);
822 extern void perf_event_mmap(struct vm_area_struct
*vma
);
823 extern struct perf_guest_info_callbacks
*perf_guest_cbs
;
824 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
825 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
827 extern void perf_event_exec(void);
828 extern void perf_event_comm(struct task_struct
*tsk
, bool exec
);
829 extern void perf_event_fork(struct task_struct
*tsk
);
832 DECLARE_PER_CPU(struct perf_callchain_entry
, perf_callchain_entry
);
834 extern void perf_callchain_user(struct perf_callchain_entry
*entry
, struct pt_regs
*regs
);
835 extern void perf_callchain_kernel(struct perf_callchain_entry
*entry
, struct pt_regs
*regs
);
837 static inline void perf_callchain_store(struct perf_callchain_entry
*entry
, u64 ip
)
839 if (entry
->nr
< PERF_MAX_STACK_DEPTH
)
840 entry
->ip
[entry
->nr
++] = ip
;
843 extern int sysctl_perf_event_paranoid
;
844 extern int sysctl_perf_event_mlock
;
845 extern int sysctl_perf_event_sample_rate
;
846 extern int sysctl_perf_cpu_time_max_percent
;
848 extern void perf_sample_event_took(u64 sample_len_ns
);
850 extern int perf_proc_update_handler(struct ctl_table
*table
, int write
,
851 void __user
*buffer
, size_t *lenp
,
853 extern int perf_cpu_time_max_percent_handler(struct ctl_table
*table
, int write
,
854 void __user
*buffer
, size_t *lenp
,
858 static inline bool perf_paranoid_tracepoint_raw(void)
860 return sysctl_perf_event_paranoid
> -1;
863 static inline bool perf_paranoid_cpu(void)
865 return sysctl_perf_event_paranoid
> 0;
868 static inline bool perf_paranoid_kernel(void)
870 return sysctl_perf_event_paranoid
> 1;
873 extern void perf_event_init(void);
874 extern void perf_tp_event(u64 addr
, u64 count
, void *record
,
875 int entry_size
, struct pt_regs
*regs
,
876 struct hlist_head
*head
, int rctx
,
877 struct task_struct
*task
);
878 extern void perf_bp_event(struct perf_event
*event
, void *data
);
880 #ifndef perf_misc_flags
881 # define perf_misc_flags(regs) \
882 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
883 # define perf_instruction_pointer(regs) instruction_pointer(regs)
886 static inline bool has_branch_stack(struct perf_event
*event
)
888 return event
->attr
.sample_type
& PERF_SAMPLE_BRANCH_STACK
;
891 static inline bool needs_branch_stack(struct perf_event
*event
)
893 return event
->attr
.branch_sample_type
!= 0;
896 static inline bool has_aux(struct perf_event
*event
)
898 return event
->pmu
->setup_aux
;
901 extern int perf_output_begin(struct perf_output_handle
*handle
,
902 struct perf_event
*event
, unsigned int size
);
903 extern void perf_output_end(struct perf_output_handle
*handle
);
904 extern unsigned int perf_output_copy(struct perf_output_handle
*handle
,
905 const void *buf
, unsigned int len
);
906 extern unsigned int perf_output_skip(struct perf_output_handle
*handle
,
908 extern int perf_swevent_get_recursion_context(void);
909 extern void perf_swevent_put_recursion_context(int rctx
);
910 extern u64
perf_swevent_set_period(struct perf_event
*event
);
911 extern void perf_event_enable(struct perf_event
*event
);
912 extern void perf_event_disable(struct perf_event
*event
);
913 extern int __perf_event_disable(void *info
);
914 extern void perf_event_task_tick(void);
915 #else /* !CONFIG_PERF_EVENTS: */
917 perf_aux_output_begin(struct perf_output_handle
*handle
,
918 struct perf_event
*event
) { return NULL
; }
920 perf_aux_output_end(struct perf_output_handle
*handle
, unsigned long size
,
923 perf_aux_output_skip(struct perf_output_handle
*handle
,
924 unsigned long size
) { return -EINVAL
; }
926 perf_get_aux(struct perf_output_handle
*handle
) { return NULL
; }
928 perf_event_task_sched_in(struct task_struct
*prev
,
929 struct task_struct
*task
) { }
931 perf_event_task_sched_out(struct task_struct
*prev
,
932 struct task_struct
*next
) { }
933 static inline int perf_event_init_task(struct task_struct
*child
) { return 0; }
934 static inline void perf_event_exit_task(struct task_struct
*child
) { }
935 static inline void perf_event_free_task(struct task_struct
*task
) { }
936 static inline void perf_event_delayed_put(struct task_struct
*task
) { }
937 static inline void perf_event_print_debug(void) { }
938 static inline int perf_event_task_disable(void) { return -EINVAL
; }
939 static inline int perf_event_task_enable(void) { return -EINVAL
; }
940 static inline int perf_event_refresh(struct perf_event
*event
, int refresh
)
946 perf_sw_event(u32 event_id
, u64 nr
, struct pt_regs
*regs
, u64 addr
) { }
948 perf_sw_event_sched(u32 event_id
, u64 nr
, u64 addr
) { }
950 perf_bp_event(struct perf_event
*event
, void *data
) { }
952 static inline int perf_register_guest_info_callbacks
953 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
954 static inline int perf_unregister_guest_info_callbacks
955 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
957 static inline void perf_event_mmap(struct vm_area_struct
*vma
) { }
958 static inline void perf_event_exec(void) { }
959 static inline void perf_event_comm(struct task_struct
*tsk
, bool exec
) { }
960 static inline void perf_event_fork(struct task_struct
*tsk
) { }
961 static inline void perf_event_init(void) { }
962 static inline int perf_swevent_get_recursion_context(void) { return -1; }
963 static inline void perf_swevent_put_recursion_context(int rctx
) { }
964 static inline u64
perf_swevent_set_period(struct perf_event
*event
) { return 0; }
965 static inline void perf_event_enable(struct perf_event
*event
) { }
966 static inline void perf_event_disable(struct perf_event
*event
) { }
967 static inline int __perf_event_disable(void *info
) { return -1; }
968 static inline void perf_event_task_tick(void) { }
971 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
972 extern bool perf_event_can_stop_tick(void);
974 static inline bool perf_event_can_stop_tick(void) { return true; }
977 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
978 extern void perf_restore_debug_store(void);
980 static inline void perf_restore_debug_store(void) { }
983 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
986 * This has to have a higher priority than migration_notifier in sched/core.c.
988 #define perf_cpu_notifier(fn) \
990 static struct notifier_block fn##_nb = \
991 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
992 unsigned long cpu = smp_processor_id(); \
993 unsigned long flags; \
995 cpu_notifier_register_begin(); \
996 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
997 (void *)(unsigned long)cpu); \
998 local_irq_save(flags); \
999 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
1000 (void *)(unsigned long)cpu); \
1001 local_irq_restore(flags); \
1002 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
1003 (void *)(unsigned long)cpu); \
1004 __register_cpu_notifier(&fn##_nb); \
1005 cpu_notifier_register_done(); \
1009 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
1010 * callback for already online CPUs.
1012 #define __perf_cpu_notifier(fn) \
1014 static struct notifier_block fn##_nb = \
1015 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
1017 __register_cpu_notifier(&fn##_nb); \
1020 struct perf_pmu_events_attr
{
1021 struct device_attribute attr
;
1023 const char *event_str
;
1026 ssize_t
perf_event_sysfs_show(struct device
*dev
, struct device_attribute
*attr
,
1029 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
1030 static struct perf_pmu_events_attr _var = { \
1031 .attr = __ATTR(_name, 0444, _show, NULL), \
1035 #define PMU_EVENT_ATTR_STRING(_name, _var, _str) \
1036 static struct perf_pmu_events_attr _var = { \
1037 .attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \
1039 .event_str = _str, \
1042 #define PMU_FORMAT_ATTR(_name, _format) \
1044 _name##_show(struct device *dev, \
1045 struct device_attribute *attr, \
1048 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
1049 return sprintf(page, _format "\n"); \
1052 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
1054 #endif /* _LINUX_PERF_EVENT_H */