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 struct task_struct
*tp_target
;
123 /* for tp_event->class */
124 struct list_head tp_list
;
126 #ifdef CONFIG_HAVE_HW_BREAKPOINT
127 struct { /* breakpoint */
129 * Crufty hack to avoid the chicken and egg
130 * problem hw_breakpoint has with context
131 * creation and event initalization.
133 struct task_struct
*bp_target
;
134 struct arch_hw_breakpoint info
;
135 struct list_head bp_list
;
140 local64_t prev_count
;
143 local64_t period_left
;
148 u64 freq_count_stamp
;
153 * hw_perf_event::state flags
155 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
156 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
157 #define PERF_HES_ARCH 0x04
162 * Common implementation detail of pmu::{start,commit,cancel}_txn
164 #define PERF_EVENT_TXN 0x1
167 * pmu::capabilities flags
169 #define PERF_PMU_CAP_NO_INTERRUPT 0x01
172 * struct pmu - generic performance monitoring unit
175 struct list_head entry
;
177 struct module
*module
;
179 const struct attribute_group
**attr_groups
;
184 * various common per-pmu feature flags
188 int * __percpu pmu_disable_count
;
189 struct perf_cpu_context
* __percpu pmu_cpu_context
;
191 int hrtimer_interval_ms
;
194 * Fully disable/enable this PMU, can be used to protect from the PMI
195 * as well as for lazy/batch writing of the MSRs.
197 void (*pmu_enable
) (struct pmu
*pmu
); /* optional */
198 void (*pmu_disable
) (struct pmu
*pmu
); /* optional */
201 * Try and initialize the event for this PMU.
202 * Should return -ENOENT when the @event doesn't match this PMU.
204 int (*event_init
) (struct perf_event
*event
);
207 * Notification that the event was mapped or unmapped. Called
208 * in the context of the mapping task.
210 void (*event_mapped
) (struct perf_event
*event
); /*optional*/
211 void (*event_unmapped
) (struct perf_event
*event
); /*optional*/
213 #define PERF_EF_START 0x01 /* start the counter when adding */
214 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
215 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
218 * Adds/Removes a counter to/from the PMU, can be done inside
219 * a transaction, see the ->*_txn() methods.
221 int (*add
) (struct perf_event
*event
, int flags
);
222 void (*del
) (struct perf_event
*event
, int flags
);
225 * Starts/Stops a counter present on the PMU. The PMI handler
226 * should stop the counter when perf_event_overflow() returns
227 * !0. ->start() will be used to continue.
229 void (*start
) (struct perf_event
*event
, int flags
);
230 void (*stop
) (struct perf_event
*event
, int flags
);
233 * Updates the counter value of the event.
235 void (*read
) (struct perf_event
*event
);
238 * Group events scheduling is treated as a transaction, add
239 * group events as a whole and perform one schedulability test.
240 * If the test fails, roll back the whole group
242 * Start the transaction, after this ->add() doesn't need to
243 * do schedulability tests.
245 void (*start_txn
) (struct pmu
*pmu
); /* optional */
247 * If ->start_txn() disabled the ->add() schedulability test
248 * then ->commit_txn() is required to perform one. On success
249 * the transaction is closed. On error the transaction is kept
250 * open until ->cancel_txn() is called.
252 int (*commit_txn
) (struct pmu
*pmu
); /* optional */
254 * Will cancel the transaction, assumes ->del() is called
255 * for each successful ->add() during the transaction.
257 void (*cancel_txn
) (struct pmu
*pmu
); /* optional */
260 * Will return the value for perf_event_mmap_page::index for this event,
261 * if no implementation is provided it will default to: event->hw.idx + 1.
263 int (*event_idx
) (struct perf_event
*event
); /*optional */
266 * context-switches callback
268 void (*sched_task
) (struct perf_event_context
*ctx
,
271 * PMU specific data size
273 size_t task_ctx_size
;
277 * Return the count value for a counter.
279 u64 (*count
) (struct perf_event
*event
); /*optional*/
283 * enum perf_event_active_state - the states of a event
285 enum perf_event_active_state
{
286 PERF_EVENT_STATE_EXIT
= -3,
287 PERF_EVENT_STATE_ERROR
= -2,
288 PERF_EVENT_STATE_OFF
= -1,
289 PERF_EVENT_STATE_INACTIVE
= 0,
290 PERF_EVENT_STATE_ACTIVE
= 1,
294 struct perf_sample_data
;
296 typedef void (*perf_overflow_handler_t
)(struct perf_event
*,
297 struct perf_sample_data
*,
298 struct pt_regs
*regs
);
300 enum perf_group_flag
{
301 PERF_GROUP_SOFTWARE
= 0x1,
304 #define SWEVENT_HLIST_BITS 8
305 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
307 struct swevent_hlist
{
308 struct hlist_head heads
[SWEVENT_HLIST_SIZE
];
309 struct rcu_head rcu_head
;
312 #define PERF_ATTACH_CONTEXT 0x01
313 #define PERF_ATTACH_GROUP 0x02
314 #define PERF_ATTACH_TASK 0x04
315 #define PERF_ATTACH_TASK_DATA 0x08
321 * struct perf_event - performance event kernel representation:
324 #ifdef CONFIG_PERF_EVENTS
326 * entry onto perf_event_context::event_list;
327 * modifications require ctx->lock
328 * RCU safe iterations.
330 struct list_head event_entry
;
333 * XXX: group_entry and sibling_list should be mutually exclusive;
334 * either you're a sibling on a group, or you're the group leader.
335 * Rework the code to always use the same list element.
337 * Locked for modification by both ctx->mutex and ctx->lock; holding
338 * either sufficies for read.
340 struct list_head group_entry
;
341 struct list_head sibling_list
;
344 * We need storage to track the entries in perf_pmu_migrate_context; we
345 * cannot use the event_entry because of RCU and we want to keep the
346 * group in tact which avoids us using the other two entries.
348 struct list_head migrate_entry
;
350 struct hlist_node hlist_entry
;
351 struct list_head active_entry
;
354 struct perf_event
*group_leader
;
357 enum perf_event_active_state state
;
358 unsigned int attach_state
;
360 atomic64_t child_count
;
363 * These are the total time in nanoseconds that the event
364 * has been enabled (i.e. eligible to run, and the task has
365 * been scheduled in, if this is a per-task event)
366 * and running (scheduled onto the CPU), respectively.
368 * They are computed from tstamp_enabled, tstamp_running and
369 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
371 u64 total_time_enabled
;
372 u64 total_time_running
;
375 * These are timestamps used for computing total_time_enabled
376 * and total_time_running when the event is in INACTIVE or
377 * ACTIVE state, measured in nanoseconds from an arbitrary point
379 * tstamp_enabled: the notional time when the event was enabled
380 * tstamp_running: the notional time when the event was scheduled on
381 * tstamp_stopped: in INACTIVE state, the notional time when the
382 * event was scheduled off.
389 * timestamp shadows the actual context timing but it can
390 * be safely used in NMI interrupt context. It reflects the
391 * context time as it was when the event was last scheduled in.
393 * ctx_time already accounts for ctx->timestamp. Therefore to
394 * compute ctx_time for a sample, simply add perf_clock().
398 struct perf_event_attr attr
;
402 struct hw_perf_event hw
;
404 struct perf_event_context
*ctx
;
405 atomic_long_t refcount
;
408 * These accumulate total time (in nanoseconds) that children
409 * events have been enabled and running, respectively.
411 atomic64_t child_total_time_enabled
;
412 atomic64_t child_total_time_running
;
415 * Protect attach/detach and child_list:
417 struct mutex child_mutex
;
418 struct list_head child_list
;
419 struct perf_event
*parent
;
424 struct list_head owner_entry
;
425 struct task_struct
*owner
;
428 struct mutex mmap_mutex
;
431 struct ring_buffer
*rb
;
432 struct list_head rb_entry
;
433 unsigned long rcu_batches
;
437 wait_queue_head_t waitq
;
438 struct fasync_struct
*fasync
;
440 /* delayed work for NMIs and such */
444 struct irq_work pending
;
446 atomic_t event_limit
;
448 void (*destroy
)(struct perf_event
*);
449 struct rcu_head rcu_head
;
451 struct pid_namespace
*ns
;
454 perf_overflow_handler_t overflow_handler
;
455 void *overflow_handler_context
;
457 #ifdef CONFIG_EVENT_TRACING
458 struct ftrace_event_call
*tp_event
;
459 struct event_filter
*filter
;
460 #ifdef CONFIG_FUNCTION_TRACER
461 struct ftrace_ops ftrace_ops
;
465 #ifdef CONFIG_CGROUP_PERF
466 struct perf_cgroup
*cgrp
; /* cgroup event is attach to */
467 int cgrp_defer_enabled
;
470 #endif /* CONFIG_PERF_EVENTS */
474 * struct perf_event_context - event context structure
476 * Used as a container for task events and CPU events as well:
478 struct perf_event_context
{
481 * Protect the states of the events in the list,
482 * nr_active, and the list:
486 * Protect the list of events. Locking either mutex or lock
487 * is sufficient to ensure the list doesn't change; to change
488 * the list you need to lock both the mutex and the spinlock.
492 struct list_head active_ctx_list
;
493 struct list_head pinned_groups
;
494 struct list_head flexible_groups
;
495 struct list_head event_list
;
503 struct task_struct
*task
;
506 * Context clock, runs when context enabled.
512 * These fields let us detect when two contexts have both
513 * been cloned (inherited) from a common ancestor.
515 struct perf_event_context
*parent_ctx
;
519 int nr_cgroups
; /* cgroup evts */
520 void *task_ctx_data
; /* pmu specific data */
521 struct rcu_head rcu_head
;
523 struct delayed_work orphans_remove
;
524 bool orphans_remove_sched
;
528 * Number of contexts where an event can trigger:
529 * task, softirq, hardirq, nmi.
531 #define PERF_NR_CONTEXTS 4
534 * struct perf_event_cpu_context - per cpu event context structure
536 struct perf_cpu_context
{
537 struct perf_event_context ctx
;
538 struct perf_event_context
*task_ctx
;
541 struct hrtimer hrtimer
;
542 ktime_t hrtimer_interval
;
543 struct pmu
*unique_pmu
;
544 struct perf_cgroup
*cgrp
;
547 struct perf_output_handle
{
548 struct perf_event
*event
;
549 struct ring_buffer
*rb
;
550 unsigned long wakeup
;
556 #ifdef CONFIG_CGROUP_PERF
559 * perf_cgroup_info keeps track of time_enabled for a cgroup.
560 * This is a per-cpu dynamically allocated data structure.
562 struct perf_cgroup_info
{
568 struct cgroup_subsys_state css
;
569 struct perf_cgroup_info __percpu
*info
;
573 * Must ensure cgroup is pinned (css_get) before calling
574 * this function. In other words, we cannot call this function
575 * if there is no cgroup event for the current CPU context.
577 static inline struct perf_cgroup
*
578 perf_cgroup_from_task(struct task_struct
*task
)
580 return container_of(task_css(task
, perf_event_cgrp_id
),
581 struct perf_cgroup
, css
);
583 #endif /* CONFIG_CGROUP_PERF */
585 #ifdef CONFIG_PERF_EVENTS
587 extern int perf_pmu_register(struct pmu
*pmu
, const char *name
, int type
);
588 extern void perf_pmu_unregister(struct pmu
*pmu
);
590 extern int perf_num_counters(void);
591 extern const char *perf_pmu_name(void);
592 extern void __perf_event_task_sched_in(struct task_struct
*prev
,
593 struct task_struct
*task
);
594 extern void __perf_event_task_sched_out(struct task_struct
*prev
,
595 struct task_struct
*next
);
596 extern int perf_event_init_task(struct task_struct
*child
);
597 extern void perf_event_exit_task(struct task_struct
*child
);
598 extern void perf_event_free_task(struct task_struct
*task
);
599 extern void perf_event_delayed_put(struct task_struct
*task
);
600 extern void perf_event_print_debug(void);
601 extern void perf_pmu_disable(struct pmu
*pmu
);
602 extern void perf_pmu_enable(struct pmu
*pmu
);
603 extern void perf_sched_cb_dec(struct pmu
*pmu
);
604 extern void perf_sched_cb_inc(struct pmu
*pmu
);
605 extern int perf_event_task_disable(void);
606 extern int perf_event_task_enable(void);
607 extern int perf_event_refresh(struct perf_event
*event
, int refresh
);
608 extern void perf_event_update_userpage(struct perf_event
*event
);
609 extern int perf_event_release_kernel(struct perf_event
*event
);
610 extern struct perf_event
*
611 perf_event_create_kernel_counter(struct perf_event_attr
*attr
,
613 struct task_struct
*task
,
614 perf_overflow_handler_t callback
,
616 extern void perf_pmu_migrate_context(struct pmu
*pmu
,
617 int src_cpu
, int dst_cpu
);
618 extern u64
perf_event_read_value(struct perf_event
*event
,
619 u64
*enabled
, u64
*running
);
622 struct perf_sample_data
{
624 * Fields set by perf_sample_data_init(), group so as to
625 * minimize the cachelines touched.
628 struct perf_raw_record
*raw
;
629 struct perf_branch_stack
*br_stack
;
633 union perf_mem_data_src data_src
;
636 * The other fields, optionally {set,used} by
637 * perf_{prepare,output}_sample().
652 struct perf_callchain_entry
*callchain
;
655 * regs_user may point to task_pt_regs or to regs_user_copy, depending
658 struct perf_regs regs_user
;
659 struct pt_regs regs_user_copy
;
661 struct perf_regs regs_intr
;
663 } ____cacheline_aligned
;
665 /* default value for data source */
666 #define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\
667 PERF_MEM_S(LVL, NA) |\
668 PERF_MEM_S(SNOOP, NA) |\
669 PERF_MEM_S(LOCK, NA) |\
672 static inline void perf_sample_data_init(struct perf_sample_data
*data
,
673 u64 addr
, u64 period
)
675 /* remaining struct members initialized in perf_prepare_sample() */
678 data
->br_stack
= NULL
;
679 data
->period
= period
;
681 data
->data_src
.val
= PERF_MEM_NA
;
685 extern void perf_output_sample(struct perf_output_handle
*handle
,
686 struct perf_event_header
*header
,
687 struct perf_sample_data
*data
,
688 struct perf_event
*event
);
689 extern void perf_prepare_sample(struct perf_event_header
*header
,
690 struct perf_sample_data
*data
,
691 struct perf_event
*event
,
692 struct pt_regs
*regs
);
694 extern int perf_event_overflow(struct perf_event
*event
,
695 struct perf_sample_data
*data
,
696 struct pt_regs
*regs
);
698 static inline bool is_sampling_event(struct perf_event
*event
)
700 return event
->attr
.sample_period
!= 0;
704 * Return 1 for a software event, 0 for a hardware event
706 static inline int is_software_event(struct perf_event
*event
)
708 return event
->pmu
->task_ctx_nr
== perf_sw_context
;
711 extern struct static_key perf_swevent_enabled
[PERF_COUNT_SW_MAX
];
713 extern void ___perf_sw_event(u32
, u64
, struct pt_regs
*, u64
);
714 extern void __perf_sw_event(u32
, u64
, struct pt_regs
*, u64
);
716 #ifndef perf_arch_fetch_caller_regs
717 static inline void perf_arch_fetch_caller_regs(struct pt_regs
*regs
, unsigned long ip
) { }
721 * Take a snapshot of the regs. Skip ip and frame pointer to
722 * the nth caller. We only need a few of the regs:
723 * - ip for PERF_SAMPLE_IP
724 * - cs for user_mode() tests
725 * - bp for callchains
726 * - eflags, for future purposes, just in case
728 static inline void perf_fetch_caller_regs(struct pt_regs
*regs
)
730 memset(regs
, 0, sizeof(*regs
));
732 perf_arch_fetch_caller_regs(regs
, CALLER_ADDR0
);
735 static __always_inline
void
736 perf_sw_event(u32 event_id
, u64 nr
, struct pt_regs
*regs
, u64 addr
)
738 if (static_key_false(&perf_swevent_enabled
[event_id
]))
739 __perf_sw_event(event_id
, nr
, regs
, addr
);
742 DECLARE_PER_CPU(struct pt_regs
, __perf_regs
[4]);
745 * 'Special' version for the scheduler, it hard assumes no recursion,
746 * which is guaranteed by us not actually scheduling inside other swevents
747 * because those disable preemption.
749 static __always_inline
void
750 perf_sw_event_sched(u32 event_id
, u64 nr
, u64 addr
)
752 if (static_key_false(&perf_swevent_enabled
[event_id
])) {
753 struct pt_regs
*regs
= this_cpu_ptr(&__perf_regs
[0]);
755 perf_fetch_caller_regs(regs
);
756 ___perf_sw_event(event_id
, nr
, regs
, addr
);
760 extern struct static_key_deferred perf_sched_events
;
762 static inline void perf_event_task_sched_in(struct task_struct
*prev
,
763 struct task_struct
*task
)
765 if (static_key_false(&perf_sched_events
.key
))
766 __perf_event_task_sched_in(prev
, task
);
769 static inline void perf_event_task_sched_out(struct task_struct
*prev
,
770 struct task_struct
*next
)
772 perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES
, 1, 0);
774 if (static_key_false(&perf_sched_events
.key
))
775 __perf_event_task_sched_out(prev
, next
);
778 static inline u64
__perf_event_count(struct perf_event
*event
)
780 return local64_read(&event
->count
) + atomic64_read(&event
->child_count
);
783 extern void perf_event_mmap(struct vm_area_struct
*vma
);
784 extern struct perf_guest_info_callbacks
*perf_guest_cbs
;
785 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
786 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
788 extern void perf_event_exec(void);
789 extern void perf_event_comm(struct task_struct
*tsk
, bool exec
);
790 extern void perf_event_fork(struct task_struct
*tsk
);
793 DECLARE_PER_CPU(struct perf_callchain_entry
, perf_callchain_entry
);
795 extern void perf_callchain_user(struct perf_callchain_entry
*entry
, struct pt_regs
*regs
);
796 extern void perf_callchain_kernel(struct perf_callchain_entry
*entry
, struct pt_regs
*regs
);
798 static inline void perf_callchain_store(struct perf_callchain_entry
*entry
, u64 ip
)
800 if (entry
->nr
< PERF_MAX_STACK_DEPTH
)
801 entry
->ip
[entry
->nr
++] = ip
;
804 extern int sysctl_perf_event_paranoid
;
805 extern int sysctl_perf_event_mlock
;
806 extern int sysctl_perf_event_sample_rate
;
807 extern int sysctl_perf_cpu_time_max_percent
;
809 extern void perf_sample_event_took(u64 sample_len_ns
);
811 extern int perf_proc_update_handler(struct ctl_table
*table
, int write
,
812 void __user
*buffer
, size_t *lenp
,
814 extern int perf_cpu_time_max_percent_handler(struct ctl_table
*table
, int write
,
815 void __user
*buffer
, size_t *lenp
,
819 static inline bool perf_paranoid_tracepoint_raw(void)
821 return sysctl_perf_event_paranoid
> -1;
824 static inline bool perf_paranoid_cpu(void)
826 return sysctl_perf_event_paranoid
> 0;
829 static inline bool perf_paranoid_kernel(void)
831 return sysctl_perf_event_paranoid
> 1;
834 extern void perf_event_init(void);
835 extern void perf_tp_event(u64 addr
, u64 count
, void *record
,
836 int entry_size
, struct pt_regs
*regs
,
837 struct hlist_head
*head
, int rctx
,
838 struct task_struct
*task
);
839 extern void perf_bp_event(struct perf_event
*event
, void *data
);
841 #ifndef perf_misc_flags
842 # define perf_misc_flags(regs) \
843 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
844 # define perf_instruction_pointer(regs) instruction_pointer(regs)
847 static inline bool has_branch_stack(struct perf_event
*event
)
849 return event
->attr
.sample_type
& PERF_SAMPLE_BRANCH_STACK
;
852 static inline bool needs_branch_stack(struct perf_event
*event
)
854 return event
->attr
.branch_sample_type
!= 0;
857 extern int perf_output_begin(struct perf_output_handle
*handle
,
858 struct perf_event
*event
, unsigned int size
);
859 extern void perf_output_end(struct perf_output_handle
*handle
);
860 extern unsigned int perf_output_copy(struct perf_output_handle
*handle
,
861 const void *buf
, unsigned int len
);
862 extern unsigned int perf_output_skip(struct perf_output_handle
*handle
,
864 extern int perf_swevent_get_recursion_context(void);
865 extern void perf_swevent_put_recursion_context(int rctx
);
866 extern u64
perf_swevent_set_period(struct perf_event
*event
);
867 extern void perf_event_enable(struct perf_event
*event
);
868 extern void perf_event_disable(struct perf_event
*event
);
869 extern int __perf_event_disable(void *info
);
870 extern void perf_event_task_tick(void);
871 #else /* !CONFIG_PERF_EVENTS: */
873 perf_event_task_sched_in(struct task_struct
*prev
,
874 struct task_struct
*task
) { }
876 perf_event_task_sched_out(struct task_struct
*prev
,
877 struct task_struct
*next
) { }
878 static inline int perf_event_init_task(struct task_struct
*child
) { return 0; }
879 static inline void perf_event_exit_task(struct task_struct
*child
) { }
880 static inline void perf_event_free_task(struct task_struct
*task
) { }
881 static inline void perf_event_delayed_put(struct task_struct
*task
) { }
882 static inline void perf_event_print_debug(void) { }
883 static inline int perf_event_task_disable(void) { return -EINVAL
; }
884 static inline int perf_event_task_enable(void) { return -EINVAL
; }
885 static inline int perf_event_refresh(struct perf_event
*event
, int refresh
)
891 perf_sw_event(u32 event_id
, u64 nr
, struct pt_regs
*regs
, u64 addr
) { }
893 perf_sw_event_sched(u32 event_id
, u64 nr
, u64 addr
) { }
895 perf_bp_event(struct perf_event
*event
, void *data
) { }
897 static inline int perf_register_guest_info_callbacks
898 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
899 static inline int perf_unregister_guest_info_callbacks
900 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
902 static inline void perf_event_mmap(struct vm_area_struct
*vma
) { }
903 static inline void perf_event_exec(void) { }
904 static inline void perf_event_comm(struct task_struct
*tsk
, bool exec
) { }
905 static inline void perf_event_fork(struct task_struct
*tsk
) { }
906 static inline void perf_event_init(void) { }
907 static inline int perf_swevent_get_recursion_context(void) { return -1; }
908 static inline void perf_swevent_put_recursion_context(int rctx
) { }
909 static inline u64
perf_swevent_set_period(struct perf_event
*event
) { return 0; }
910 static inline void perf_event_enable(struct perf_event
*event
) { }
911 static inline void perf_event_disable(struct perf_event
*event
) { }
912 static inline int __perf_event_disable(void *info
) { return -1; }
913 static inline void perf_event_task_tick(void) { }
916 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
917 extern bool perf_event_can_stop_tick(void);
919 static inline bool perf_event_can_stop_tick(void) { return true; }
922 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
923 extern void perf_restore_debug_store(void);
925 static inline void perf_restore_debug_store(void) { }
928 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
931 * This has to have a higher priority than migration_notifier in sched/core.c.
933 #define perf_cpu_notifier(fn) \
935 static struct notifier_block fn##_nb = \
936 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
937 unsigned long cpu = smp_processor_id(); \
938 unsigned long flags; \
940 cpu_notifier_register_begin(); \
941 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
942 (void *)(unsigned long)cpu); \
943 local_irq_save(flags); \
944 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
945 (void *)(unsigned long)cpu); \
946 local_irq_restore(flags); \
947 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
948 (void *)(unsigned long)cpu); \
949 __register_cpu_notifier(&fn##_nb); \
950 cpu_notifier_register_done(); \
954 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
955 * callback for already online CPUs.
957 #define __perf_cpu_notifier(fn) \
959 static struct notifier_block fn##_nb = \
960 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
962 __register_cpu_notifier(&fn##_nb); \
965 struct perf_pmu_events_attr
{
966 struct device_attribute attr
;
968 const char *event_str
;
971 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
972 static struct perf_pmu_events_attr _var = { \
973 .attr = __ATTR(_name, 0444, _show, NULL), \
977 #define PMU_FORMAT_ATTR(_name, _format) \
979 _name##_show(struct device *dev, \
980 struct device_attribute *attr, \
983 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
984 return sprintf(page, _format "\n"); \
987 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
989 #endif /* _LINUX_PERF_EVENT_H */