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 <asm/local.h>
58 struct perf_callchain_entry
{
60 __u64 ip
[PERF_MAX_STACK_DEPTH
];
63 struct perf_raw_record
{
69 * branch stack layout:
70 * nr: number of taken branches stored in entries[]
72 * Note that nr can vary from sample to sample
73 * branches (to, from) are stored from most recent
74 * to least recent, i.e., entries[0] contains the most
77 struct perf_branch_stack
{
79 struct perf_branch_entry entries
[0];
85 * extra PMU register associated with an event
87 struct hw_perf_event_extra
{
88 u64 config
; /* register value */
89 unsigned int reg
; /* register address or index */
90 int alloc
; /* extra register already allocated */
91 int idx
; /* index in shared_regs->regs[] */
94 struct event_constraint
;
97 * struct hw_perf_event - performance event hardware details:
99 struct hw_perf_event
{
100 #ifdef CONFIG_PERF_EVENTS
102 struct { /* hardware */
105 unsigned long config_base
;
106 unsigned long event_base
;
107 int event_base_rdpmc
;
112 struct hw_perf_event_extra extra_reg
;
113 struct hw_perf_event_extra branch_reg
;
115 struct event_constraint
*constraint
;
117 struct { /* software */
118 struct hrtimer hrtimer
;
120 struct { /* tracepoint */
121 struct task_struct
*tp_target
;
122 /* for tp_event->class */
123 struct list_head tp_list
;
125 #ifdef CONFIG_HAVE_HW_BREAKPOINT
126 struct { /* breakpoint */
128 * Crufty hack to avoid the chicken and egg
129 * problem hw_breakpoint has with context
130 * creation and event initalization.
132 struct task_struct
*bp_target
;
133 struct arch_hw_breakpoint info
;
134 struct list_head bp_list
;
139 local64_t prev_count
;
142 local64_t period_left
;
147 u64 freq_count_stamp
;
152 * hw_perf_event::state flags
154 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
155 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
156 #define PERF_HES_ARCH 0x04
161 * Common implementation detail of pmu::{start,commit,cancel}_txn
163 #define PERF_EVENT_TXN 0x1
166 * pmu::capabilities flags
168 #define PERF_PMU_CAP_NO_INTERRUPT 0x01
171 * struct pmu - generic performance monitoring unit
174 struct list_head entry
;
176 struct module
*module
;
178 const struct attribute_group
**attr_groups
;
183 * various common per-pmu feature flags
187 int * __percpu pmu_disable_count
;
188 struct perf_cpu_context
* __percpu pmu_cpu_context
;
190 int hrtimer_interval_ms
;
193 * Fully disable/enable this PMU, can be used to protect from the PMI
194 * as well as for lazy/batch writing of the MSRs.
196 void (*pmu_enable
) (struct pmu
*pmu
); /* optional */
197 void (*pmu_disable
) (struct pmu
*pmu
); /* optional */
200 * Try and initialize the event for this PMU.
201 * Should return -ENOENT when the @event doesn't match this PMU.
203 int (*event_init
) (struct perf_event
*event
);
205 #define PERF_EF_START 0x01 /* start the counter when adding */
206 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
207 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
210 * Adds/Removes a counter to/from the PMU, can be done inside
211 * a transaction, see the ->*_txn() methods.
213 int (*add
) (struct perf_event
*event
, int flags
);
214 void (*del
) (struct perf_event
*event
, int flags
);
217 * Starts/Stops a counter present on the PMU. The PMI handler
218 * should stop the counter when perf_event_overflow() returns
219 * !0. ->start() will be used to continue.
221 void (*start
) (struct perf_event
*event
, int flags
);
222 void (*stop
) (struct perf_event
*event
, int flags
);
225 * Updates the counter value of the event.
227 void (*read
) (struct perf_event
*event
);
230 * Group events scheduling is treated as a transaction, add
231 * group events as a whole and perform one schedulability test.
232 * If the test fails, roll back the whole group
234 * Start the transaction, after this ->add() doesn't need to
235 * do schedulability tests.
237 void (*start_txn
) (struct pmu
*pmu
); /* optional */
239 * If ->start_txn() disabled the ->add() schedulability test
240 * then ->commit_txn() is required to perform one. On success
241 * the transaction is closed. On error the transaction is kept
242 * open until ->cancel_txn() is called.
244 int (*commit_txn
) (struct pmu
*pmu
); /* optional */
246 * Will cancel the transaction, assumes ->del() is called
247 * for each successful ->add() during the transaction.
249 void (*cancel_txn
) (struct pmu
*pmu
); /* optional */
252 * Will return the value for perf_event_mmap_page::index for this event,
253 * if no implementation is provided it will default to: event->hw.idx + 1.
255 int (*event_idx
) (struct perf_event
*event
); /*optional */
258 * flush branch stack on context-switches (needed in cpu-wide mode)
260 void (*flush_branch_stack
) (void);
264 * enum perf_event_active_state - the states of a event
266 enum perf_event_active_state
{
267 PERF_EVENT_STATE_EXIT
= -3,
268 PERF_EVENT_STATE_ERROR
= -2,
269 PERF_EVENT_STATE_OFF
= -1,
270 PERF_EVENT_STATE_INACTIVE
= 0,
271 PERF_EVENT_STATE_ACTIVE
= 1,
275 struct perf_sample_data
;
277 typedef void (*perf_overflow_handler_t
)(struct perf_event
*,
278 struct perf_sample_data
*,
279 struct pt_regs
*regs
);
281 enum perf_group_flag
{
282 PERF_GROUP_SOFTWARE
= 0x1,
285 #define SWEVENT_HLIST_BITS 8
286 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
288 struct swevent_hlist
{
289 struct hlist_head heads
[SWEVENT_HLIST_SIZE
];
290 struct rcu_head rcu_head
;
293 #define PERF_ATTACH_CONTEXT 0x01
294 #define PERF_ATTACH_GROUP 0x02
295 #define PERF_ATTACH_TASK 0x04
301 * struct perf_event - performance event kernel representation:
304 #ifdef CONFIG_PERF_EVENTS
306 * entry onto perf_event_context::event_list;
307 * modifications require ctx->lock
308 * RCU safe iterations.
310 struct list_head event_entry
;
313 * XXX: group_entry and sibling_list should be mutually exclusive;
314 * either you're a sibling on a group, or you're the group leader.
315 * Rework the code to always use the same list element.
317 * Locked for modification by both ctx->mutex and ctx->lock; holding
318 * either sufficies for read.
320 struct list_head group_entry
;
321 struct list_head sibling_list
;
324 * We need storage to track the entries in perf_pmu_migrate_context; we
325 * cannot use the event_entry because of RCU and we want to keep the
326 * group in tact which avoids us using the other two entries.
328 struct list_head migrate_entry
;
330 struct hlist_node hlist_entry
;
331 struct list_head active_entry
;
334 struct perf_event
*group_leader
;
337 enum perf_event_active_state state
;
338 unsigned int attach_state
;
340 atomic64_t child_count
;
343 * These are the total time in nanoseconds that the event
344 * has been enabled (i.e. eligible to run, and the task has
345 * been scheduled in, if this is a per-task event)
346 * and running (scheduled onto the CPU), respectively.
348 * They are computed from tstamp_enabled, tstamp_running and
349 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
351 u64 total_time_enabled
;
352 u64 total_time_running
;
355 * These are timestamps used for computing total_time_enabled
356 * and total_time_running when the event is in INACTIVE or
357 * ACTIVE state, measured in nanoseconds from an arbitrary point
359 * tstamp_enabled: the notional time when the event was enabled
360 * tstamp_running: the notional time when the event was scheduled on
361 * tstamp_stopped: in INACTIVE state, the notional time when the
362 * event was scheduled off.
369 * timestamp shadows the actual context timing but it can
370 * be safely used in NMI interrupt context. It reflects the
371 * context time as it was when the event was last scheduled in.
373 * ctx_time already accounts for ctx->timestamp. Therefore to
374 * compute ctx_time for a sample, simply add perf_clock().
378 struct perf_event_attr attr
;
382 struct hw_perf_event hw
;
384 struct perf_event_context
*ctx
;
385 atomic_long_t refcount
;
388 * These accumulate total time (in nanoseconds) that children
389 * events have been enabled and running, respectively.
391 atomic64_t child_total_time_enabled
;
392 atomic64_t child_total_time_running
;
395 * Protect attach/detach and child_list:
397 struct mutex child_mutex
;
398 struct list_head child_list
;
399 struct perf_event
*parent
;
404 struct list_head owner_entry
;
405 struct task_struct
*owner
;
408 struct mutex mmap_mutex
;
411 struct ring_buffer
*rb
;
412 struct list_head rb_entry
;
413 unsigned long rcu_batches
;
417 wait_queue_head_t waitq
;
418 struct fasync_struct
*fasync
;
420 /* delayed work for NMIs and such */
424 struct irq_work pending
;
426 atomic_t event_limit
;
428 void (*destroy
)(struct perf_event
*);
429 struct rcu_head rcu_head
;
431 struct pid_namespace
*ns
;
434 perf_overflow_handler_t overflow_handler
;
435 void *overflow_handler_context
;
437 #ifdef CONFIG_EVENT_TRACING
438 struct ftrace_event_call
*tp_event
;
439 struct event_filter
*filter
;
440 #ifdef CONFIG_FUNCTION_TRACER
441 struct ftrace_ops ftrace_ops
;
445 #ifdef CONFIG_CGROUP_PERF
446 struct perf_cgroup
*cgrp
; /* cgroup event is attach to */
447 int cgrp_defer_enabled
;
450 #endif /* CONFIG_PERF_EVENTS */
453 enum perf_event_context_type
{
459 * struct perf_event_context - event context structure
461 * Used as a container for task events and CPU events as well:
463 struct perf_event_context
{
465 enum perf_event_context_type type
;
467 * Protect the states of the events in the list,
468 * nr_active, and the list:
472 * Protect the list of events. Locking either mutex or lock
473 * is sufficient to ensure the list doesn't change; to change
474 * the list you need to lock both the mutex and the spinlock.
478 struct list_head pinned_groups
;
479 struct list_head flexible_groups
;
480 struct list_head event_list
;
488 struct task_struct
*task
;
491 * Context clock, runs when context enabled.
497 * These fields let us detect when two contexts have both
498 * been cloned (inherited) from a common ancestor.
500 struct perf_event_context
*parent_ctx
;
504 int nr_cgroups
; /* cgroup evts */
505 int nr_branch_stack
; /* branch_stack evt */
506 struct rcu_head rcu_head
;
508 struct delayed_work orphans_remove
;
509 bool orphans_remove_sched
;
513 * Number of contexts where an event can trigger:
514 * task, softirq, hardirq, nmi.
516 #define PERF_NR_CONTEXTS 4
519 * struct perf_event_cpu_context - per cpu event context structure
521 struct perf_cpu_context
{
522 struct perf_event_context ctx
;
523 struct perf_event_context
*task_ctx
;
526 struct hrtimer hrtimer
;
527 ktime_t hrtimer_interval
;
528 struct list_head rotation_list
;
529 struct pmu
*unique_pmu
;
530 struct perf_cgroup
*cgrp
;
533 struct perf_output_handle
{
534 struct perf_event
*event
;
535 struct ring_buffer
*rb
;
536 unsigned long wakeup
;
542 #ifdef CONFIG_PERF_EVENTS
544 extern int perf_pmu_register(struct pmu
*pmu
, const char *name
, int type
);
545 extern void perf_pmu_unregister(struct pmu
*pmu
);
547 extern int perf_num_counters(void);
548 extern const char *perf_pmu_name(void);
549 extern void __perf_event_task_sched_in(struct task_struct
*prev
,
550 struct task_struct
*task
);
551 extern void __perf_event_task_sched_out(struct task_struct
*prev
,
552 struct task_struct
*next
);
553 extern int perf_event_init_task(struct task_struct
*child
);
554 extern void perf_event_exit_task(struct task_struct
*child
);
555 extern void perf_event_free_task(struct task_struct
*task
);
556 extern void perf_event_delayed_put(struct task_struct
*task
);
557 extern void perf_event_print_debug(void);
558 extern void perf_pmu_disable(struct pmu
*pmu
);
559 extern void perf_pmu_enable(struct pmu
*pmu
);
560 extern int perf_event_task_disable(void);
561 extern int perf_event_task_enable(void);
562 extern int perf_event_refresh(struct perf_event
*event
, int refresh
);
563 extern void perf_event_update_userpage(struct perf_event
*event
);
564 extern int perf_event_release_kernel(struct perf_event
*event
);
565 extern struct perf_event
*
566 perf_event_create_kernel_counter(struct perf_event_attr
*attr
,
568 struct task_struct
*task
,
569 perf_overflow_handler_t callback
,
571 extern void perf_pmu_migrate_context(struct pmu
*pmu
,
572 int src_cpu
, int dst_cpu
);
573 extern u64
perf_event_read_value(struct perf_event
*event
,
574 u64
*enabled
, u64
*running
);
577 struct perf_sample_data
{
579 * Fields set by perf_sample_data_init(), group so as to
580 * minimize the cachelines touched.
583 struct perf_raw_record
*raw
;
584 struct perf_branch_stack
*br_stack
;
588 union perf_mem_data_src data_src
;
591 * The other fields, optionally {set,used} by
592 * perf_{prepare,output}_sample().
607 struct perf_callchain_entry
*callchain
;
610 * regs_user may point to task_pt_regs or to regs_user_copy, depending
613 struct perf_regs regs_user
;
614 struct pt_regs regs_user_copy
;
616 struct perf_regs regs_intr
;
618 } ____cacheline_aligned
;
620 /* default value for data source */
621 #define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\
622 PERF_MEM_S(LVL, NA) |\
623 PERF_MEM_S(SNOOP, NA) |\
624 PERF_MEM_S(LOCK, NA) |\
627 static inline void perf_sample_data_init(struct perf_sample_data
*data
,
628 u64 addr
, u64 period
)
630 /* remaining struct members initialized in perf_prepare_sample() */
633 data
->br_stack
= NULL
;
634 data
->period
= period
;
636 data
->data_src
.val
= PERF_MEM_NA
;
640 extern void perf_output_sample(struct perf_output_handle
*handle
,
641 struct perf_event_header
*header
,
642 struct perf_sample_data
*data
,
643 struct perf_event
*event
);
644 extern void perf_prepare_sample(struct perf_event_header
*header
,
645 struct perf_sample_data
*data
,
646 struct perf_event
*event
,
647 struct pt_regs
*regs
);
649 extern int perf_event_overflow(struct perf_event
*event
,
650 struct perf_sample_data
*data
,
651 struct pt_regs
*regs
);
653 static inline bool is_sampling_event(struct perf_event
*event
)
655 return event
->attr
.sample_period
!= 0;
659 * Return 1 for a software event, 0 for a hardware event
661 static inline int is_software_event(struct perf_event
*event
)
663 return event
->pmu
->task_ctx_nr
== perf_sw_context
;
666 extern struct static_key perf_swevent_enabled
[PERF_COUNT_SW_MAX
];
668 extern void __perf_sw_event(u32
, u64
, struct pt_regs
*, u64
);
670 #ifndef perf_arch_fetch_caller_regs
671 static inline void perf_arch_fetch_caller_regs(struct pt_regs
*regs
, unsigned long ip
) { }
675 * Take a snapshot of the regs. Skip ip and frame pointer to
676 * the nth caller. We only need a few of the regs:
677 * - ip for PERF_SAMPLE_IP
678 * - cs for user_mode() tests
679 * - bp for callchains
680 * - eflags, for future purposes, just in case
682 static inline void perf_fetch_caller_regs(struct pt_regs
*regs
)
684 memset(regs
, 0, sizeof(*regs
));
686 perf_arch_fetch_caller_regs(regs
, CALLER_ADDR0
);
689 static __always_inline
void
690 perf_sw_event(u32 event_id
, u64 nr
, struct pt_regs
*regs
, u64 addr
)
692 struct pt_regs hot_regs
;
694 if (static_key_false(&perf_swevent_enabled
[event_id
])) {
696 perf_fetch_caller_regs(&hot_regs
);
699 __perf_sw_event(event_id
, nr
, regs
, addr
);
703 extern struct static_key_deferred perf_sched_events
;
705 static inline void perf_event_task_sched_in(struct task_struct
*prev
,
706 struct task_struct
*task
)
708 if (static_key_false(&perf_sched_events
.key
))
709 __perf_event_task_sched_in(prev
, task
);
712 static inline void perf_event_task_sched_out(struct task_struct
*prev
,
713 struct task_struct
*next
)
715 perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES
, 1, NULL
, 0);
717 if (static_key_false(&perf_sched_events
.key
))
718 __perf_event_task_sched_out(prev
, next
);
721 extern void perf_event_mmap(struct vm_area_struct
*vma
);
722 extern struct perf_guest_info_callbacks
*perf_guest_cbs
;
723 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
724 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
726 extern void perf_event_exec(void);
727 extern void perf_event_comm(struct task_struct
*tsk
, bool exec
);
728 extern void perf_event_fork(struct task_struct
*tsk
);
731 DECLARE_PER_CPU(struct perf_callchain_entry
, perf_callchain_entry
);
733 extern void perf_callchain_user(struct perf_callchain_entry
*entry
, struct pt_regs
*regs
);
734 extern void perf_callchain_kernel(struct perf_callchain_entry
*entry
, struct pt_regs
*regs
);
736 static inline void perf_callchain_store(struct perf_callchain_entry
*entry
, u64 ip
)
738 if (entry
->nr
< PERF_MAX_STACK_DEPTH
)
739 entry
->ip
[entry
->nr
++] = ip
;
742 extern int sysctl_perf_event_paranoid
;
743 extern int sysctl_perf_event_mlock
;
744 extern int sysctl_perf_event_sample_rate
;
745 extern int sysctl_perf_cpu_time_max_percent
;
747 extern void perf_sample_event_took(u64 sample_len_ns
);
749 extern int perf_proc_update_handler(struct ctl_table
*table
, int write
,
750 void __user
*buffer
, size_t *lenp
,
752 extern int perf_cpu_time_max_percent_handler(struct ctl_table
*table
, int write
,
753 void __user
*buffer
, size_t *lenp
,
757 static inline bool perf_paranoid_tracepoint_raw(void)
759 return sysctl_perf_event_paranoid
> -1;
762 static inline bool perf_paranoid_cpu(void)
764 return sysctl_perf_event_paranoid
> 0;
767 static inline bool perf_paranoid_kernel(void)
769 return sysctl_perf_event_paranoid
> 1;
772 extern void perf_event_init(void);
773 extern void perf_tp_event(u64 addr
, u64 count
, void *record
,
774 int entry_size
, struct pt_regs
*regs
,
775 struct hlist_head
*head
, int rctx
,
776 struct task_struct
*task
);
777 extern void perf_bp_event(struct perf_event
*event
, void *data
);
779 #ifndef perf_misc_flags
780 # define perf_misc_flags(regs) \
781 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
782 # define perf_instruction_pointer(regs) instruction_pointer(regs)
785 static inline bool has_branch_stack(struct perf_event
*event
)
787 return event
->attr
.sample_type
& PERF_SAMPLE_BRANCH_STACK
;
790 extern int perf_output_begin(struct perf_output_handle
*handle
,
791 struct perf_event
*event
, unsigned int size
);
792 extern void perf_output_end(struct perf_output_handle
*handle
);
793 extern unsigned int perf_output_copy(struct perf_output_handle
*handle
,
794 const void *buf
, unsigned int len
);
795 extern unsigned int perf_output_skip(struct perf_output_handle
*handle
,
797 extern int perf_swevent_get_recursion_context(void);
798 extern void perf_swevent_put_recursion_context(int rctx
);
799 extern u64
perf_swevent_set_period(struct perf_event
*event
);
800 extern void perf_event_enable(struct perf_event
*event
);
801 extern void perf_event_disable(struct perf_event
*event
);
802 extern int __perf_event_disable(void *info
);
803 extern void perf_event_task_tick(void);
804 #else /* !CONFIG_PERF_EVENTS: */
806 perf_event_task_sched_in(struct task_struct
*prev
,
807 struct task_struct
*task
) { }
809 perf_event_task_sched_out(struct task_struct
*prev
,
810 struct task_struct
*next
) { }
811 static inline int perf_event_init_task(struct task_struct
*child
) { return 0; }
812 static inline void perf_event_exit_task(struct task_struct
*child
) { }
813 static inline void perf_event_free_task(struct task_struct
*task
) { }
814 static inline void perf_event_delayed_put(struct task_struct
*task
) { }
815 static inline void perf_event_print_debug(void) { }
816 static inline int perf_event_task_disable(void) { return -EINVAL
; }
817 static inline int perf_event_task_enable(void) { return -EINVAL
; }
818 static inline int perf_event_refresh(struct perf_event
*event
, int refresh
)
824 perf_sw_event(u32 event_id
, u64 nr
, struct pt_regs
*regs
, u64 addr
) { }
826 perf_bp_event(struct perf_event
*event
, void *data
) { }
828 static inline int perf_register_guest_info_callbacks
829 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
830 static inline int perf_unregister_guest_info_callbacks
831 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
833 static inline void perf_event_mmap(struct vm_area_struct
*vma
) { }
834 static inline void perf_event_exec(void) { }
835 static inline void perf_event_comm(struct task_struct
*tsk
, bool exec
) { }
836 static inline void perf_event_fork(struct task_struct
*tsk
) { }
837 static inline void perf_event_init(void) { }
838 static inline int perf_swevent_get_recursion_context(void) { return -1; }
839 static inline void perf_swevent_put_recursion_context(int rctx
) { }
840 static inline u64
perf_swevent_set_period(struct perf_event
*event
) { return 0; }
841 static inline void perf_event_enable(struct perf_event
*event
) { }
842 static inline void perf_event_disable(struct perf_event
*event
) { }
843 static inline int __perf_event_disable(void *info
) { return -1; }
844 static inline void perf_event_task_tick(void) { }
847 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
848 extern bool perf_event_can_stop_tick(void);
850 static inline bool perf_event_can_stop_tick(void) { return true; }
853 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
854 extern void perf_restore_debug_store(void);
856 static inline void perf_restore_debug_store(void) { }
859 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
862 * This has to have a higher priority than migration_notifier in sched/core.c.
864 #define perf_cpu_notifier(fn) \
866 static struct notifier_block fn##_nb = \
867 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
868 unsigned long cpu = smp_processor_id(); \
869 unsigned long flags; \
871 cpu_notifier_register_begin(); \
872 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
873 (void *)(unsigned long)cpu); \
874 local_irq_save(flags); \
875 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
876 (void *)(unsigned long)cpu); \
877 local_irq_restore(flags); \
878 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
879 (void *)(unsigned long)cpu); \
880 __register_cpu_notifier(&fn##_nb); \
881 cpu_notifier_register_done(); \
885 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
886 * callback for already online CPUs.
888 #define __perf_cpu_notifier(fn) \
890 static struct notifier_block fn##_nb = \
891 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
893 __register_cpu_notifier(&fn##_nb); \
896 struct perf_pmu_events_attr
{
897 struct device_attribute attr
;
899 const char *event_str
;
902 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
903 static struct perf_pmu_events_attr _var = { \
904 .attr = __ATTR(_name, 0444, _show, NULL), \
908 #define PMU_FORMAT_ATTR(_name, _format) \
910 _name##_show(struct device *dev, \
911 struct device_attribute *attr, \
914 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
915 return sprintf(page, _format "\n"); \
918 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
920 #endif /* _LINUX_PERF_EVENT_H */