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 <asm/local.h>
57 struct perf_callchain_entry
{
59 __u64 ip
[PERF_MAX_STACK_DEPTH
];
62 struct perf_raw_record
{
68 * branch stack layout:
69 * nr: number of taken branches stored in entries[]
71 * Note that nr can vary from sample to sample
72 * branches (to, from) are stored from most recent
73 * to least recent, i.e., entries[0] contains the most
76 struct perf_branch_stack
{
78 struct perf_branch_entry entries
[0];
81 struct perf_regs_user
{
89 * extra PMU register associated with an event
91 struct hw_perf_event_extra
{
92 u64 config
; /* register value */
93 unsigned int reg
; /* register address or index */
94 int alloc
; /* extra register already allocated */
95 int idx
; /* index in shared_regs->regs[] */
98 struct event_constraint
;
101 * struct hw_perf_event - performance event hardware details:
103 struct hw_perf_event
{
104 #ifdef CONFIG_PERF_EVENTS
106 struct { /* hardware */
109 unsigned long config_base
;
110 unsigned long event_base
;
111 int event_base_rdpmc
;
116 struct hw_perf_event_extra extra_reg
;
117 struct hw_perf_event_extra branch_reg
;
119 struct event_constraint
*constraint
;
121 struct { /* software */
122 struct hrtimer hrtimer
;
124 struct { /* tracepoint */
125 struct task_struct
*tp_target
;
126 /* for tp_event->class */
127 struct list_head tp_list
;
129 #ifdef CONFIG_HAVE_HW_BREAKPOINT
130 struct { /* breakpoint */
132 * Crufty hack to avoid the chicken and egg
133 * problem hw_breakpoint has with context
134 * creation and event initalization.
136 struct task_struct
*bp_target
;
137 struct arch_hw_breakpoint info
;
138 struct list_head bp_list
;
143 local64_t prev_count
;
146 local64_t period_left
;
151 u64 freq_count_stamp
;
156 * hw_perf_event::state flags
158 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
159 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
160 #define PERF_HES_ARCH 0x04
165 * Common implementation detail of pmu::{start,commit,cancel}_txn
167 #define PERF_EVENT_TXN 0x1
170 * struct pmu - generic performance monitoring unit
173 struct list_head entry
;
176 const struct attribute_group
**attr_groups
;
180 int * __percpu pmu_disable_count
;
181 struct perf_cpu_context
* __percpu pmu_cpu_context
;
183 int hrtimer_interval_ms
;
186 * Fully disable/enable this PMU, can be used to protect from the PMI
187 * as well as for lazy/batch writing of the MSRs.
189 void (*pmu_enable
) (struct pmu
*pmu
); /* optional */
190 void (*pmu_disable
) (struct pmu
*pmu
); /* optional */
193 * Try and initialize the event for this PMU.
194 * Should return -ENOENT when the @event doesn't match this PMU.
196 int (*event_init
) (struct perf_event
*event
);
198 #define PERF_EF_START 0x01 /* start the counter when adding */
199 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
200 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
203 * Adds/Removes a counter to/from the PMU, can be done inside
204 * a transaction, see the ->*_txn() methods.
206 int (*add
) (struct perf_event
*event
, int flags
);
207 void (*del
) (struct perf_event
*event
, int flags
);
210 * Starts/Stops a counter present on the PMU. The PMI handler
211 * should stop the counter when perf_event_overflow() returns
212 * !0. ->start() will be used to continue.
214 void (*start
) (struct perf_event
*event
, int flags
);
215 void (*stop
) (struct perf_event
*event
, int flags
);
218 * Updates the counter value of the event.
220 void (*read
) (struct perf_event
*event
);
223 * Group events scheduling is treated as a transaction, add
224 * group events as a whole and perform one schedulability test.
225 * If the test fails, roll back the whole group
227 * Start the transaction, after this ->add() doesn't need to
228 * do schedulability tests.
230 void (*start_txn
) (struct pmu
*pmu
); /* optional */
232 * If ->start_txn() disabled the ->add() schedulability test
233 * then ->commit_txn() is required to perform one. On success
234 * the transaction is closed. On error the transaction is kept
235 * open until ->cancel_txn() is called.
237 int (*commit_txn
) (struct pmu
*pmu
); /* optional */
239 * Will cancel the transaction, assumes ->del() is called
240 * for each successful ->add() during the transaction.
242 void (*cancel_txn
) (struct pmu
*pmu
); /* optional */
245 * Will return the value for perf_event_mmap_page::index for this event,
246 * if no implementation is provided it will default to: event->hw.idx + 1.
248 int (*event_idx
) (struct perf_event
*event
); /*optional */
251 * flush branch stack on context-switches (needed in cpu-wide mode)
253 void (*flush_branch_stack
) (void);
257 * enum perf_event_active_state - the states of a event
259 enum perf_event_active_state
{
260 PERF_EVENT_STATE_ERROR
= -2,
261 PERF_EVENT_STATE_OFF
= -1,
262 PERF_EVENT_STATE_INACTIVE
= 0,
263 PERF_EVENT_STATE_ACTIVE
= 1,
267 struct perf_sample_data
;
269 typedef void (*perf_overflow_handler_t
)(struct perf_event
*,
270 struct perf_sample_data
*,
271 struct pt_regs
*regs
);
273 enum perf_group_flag
{
274 PERF_GROUP_SOFTWARE
= 0x1,
277 #define SWEVENT_HLIST_BITS 8
278 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
280 struct swevent_hlist
{
281 struct hlist_head heads
[SWEVENT_HLIST_SIZE
];
282 struct rcu_head rcu_head
;
285 #define PERF_ATTACH_CONTEXT 0x01
286 #define PERF_ATTACH_GROUP 0x02
287 #define PERF_ATTACH_TASK 0x04
293 * struct perf_event - performance event kernel representation:
296 #ifdef CONFIG_PERF_EVENTS
298 * entry onto perf_event_context::event_list;
299 * modifications require ctx->lock
300 * RCU safe iterations.
302 struct list_head event_entry
;
305 * XXX: group_entry and sibling_list should be mutually exclusive;
306 * either you're a sibling on a group, or you're the group leader.
307 * Rework the code to always use the same list element.
309 * Locked for modification by both ctx->mutex and ctx->lock; holding
310 * either sufficies for read.
312 struct list_head group_entry
;
313 struct list_head sibling_list
;
316 * We need storage to track the entries in perf_pmu_migrate_context; we
317 * cannot use the event_entry because of RCU and we want to keep the
318 * group in tact which avoids us using the other two entries.
320 struct list_head migrate_entry
;
322 struct hlist_node hlist_entry
;
325 struct perf_event
*group_leader
;
328 enum perf_event_active_state state
;
329 unsigned int attach_state
;
331 atomic64_t child_count
;
334 * These are the total time in nanoseconds that the event
335 * has been enabled (i.e. eligible to run, and the task has
336 * been scheduled in, if this is a per-task event)
337 * and running (scheduled onto the CPU), respectively.
339 * They are computed from tstamp_enabled, tstamp_running and
340 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
342 u64 total_time_enabled
;
343 u64 total_time_running
;
346 * These are timestamps used for computing total_time_enabled
347 * and total_time_running when the event is in INACTIVE or
348 * ACTIVE state, measured in nanoseconds from an arbitrary point
350 * tstamp_enabled: the notional time when the event was enabled
351 * tstamp_running: the notional time when the event was scheduled on
352 * tstamp_stopped: in INACTIVE state, the notional time when the
353 * event was scheduled off.
360 * timestamp shadows the actual context timing but it can
361 * be safely used in NMI interrupt context. It reflects the
362 * context time as it was when the event was last scheduled in.
364 * ctx_time already accounts for ctx->timestamp. Therefore to
365 * compute ctx_time for a sample, simply add perf_clock().
369 struct perf_event_attr attr
;
373 struct hw_perf_event hw
;
375 struct perf_event_context
*ctx
;
376 atomic_long_t refcount
;
379 * These accumulate total time (in nanoseconds) that children
380 * events have been enabled and running, respectively.
382 atomic64_t child_total_time_enabled
;
383 atomic64_t child_total_time_running
;
386 * Protect attach/detach and child_list:
388 struct mutex child_mutex
;
389 struct list_head child_list
;
390 struct perf_event
*parent
;
395 struct list_head owner_entry
;
396 struct task_struct
*owner
;
399 struct mutex mmap_mutex
;
402 struct ring_buffer
*rb
;
403 struct list_head rb_entry
;
406 wait_queue_head_t waitq
;
407 struct fasync_struct
*fasync
;
409 /* delayed work for NMIs and such */
413 struct irq_work pending
;
415 atomic_t event_limit
;
417 void (*destroy
)(struct perf_event
*);
418 struct rcu_head rcu_head
;
420 struct pid_namespace
*ns
;
423 perf_overflow_handler_t overflow_handler
;
424 void *overflow_handler_context
;
426 #ifdef CONFIG_EVENT_TRACING
427 struct ftrace_event_call
*tp_event
;
428 struct event_filter
*filter
;
429 #ifdef CONFIG_FUNCTION_TRACER
430 struct ftrace_ops ftrace_ops
;
434 #ifdef CONFIG_CGROUP_PERF
435 struct perf_cgroup
*cgrp
; /* cgroup event is attach to */
436 int cgrp_defer_enabled
;
439 #endif /* CONFIG_PERF_EVENTS */
442 enum perf_event_context_type
{
448 * struct perf_event_context - event context structure
450 * Used as a container for task events and CPU events as well:
452 struct perf_event_context
{
454 enum perf_event_context_type type
;
456 * Protect the states of the events in the list,
457 * nr_active, and the list:
461 * Protect the list of events. Locking either mutex or lock
462 * is sufficient to ensure the list doesn't change; to change
463 * the list you need to lock both the mutex and the spinlock.
467 struct list_head pinned_groups
;
468 struct list_head flexible_groups
;
469 struct list_head event_list
;
477 struct task_struct
*task
;
480 * Context clock, runs when context enabled.
486 * These fields let us detect when two contexts have both
487 * been cloned (inherited) from a common ancestor.
489 struct perf_event_context
*parent_ctx
;
493 int nr_cgroups
; /* cgroup evts */
494 int nr_branch_stack
; /* branch_stack evt */
495 struct rcu_head rcu_head
;
499 * Number of contexts where an event can trigger:
500 * task, softirq, hardirq, nmi.
502 #define PERF_NR_CONTEXTS 4
505 * struct perf_event_cpu_context - per cpu event context structure
507 struct perf_cpu_context
{
508 struct perf_event_context ctx
;
509 struct perf_event_context
*task_ctx
;
512 struct hrtimer hrtimer
;
513 ktime_t hrtimer_interval
;
514 struct list_head rotation_list
;
515 struct pmu
*unique_pmu
;
516 struct perf_cgroup
*cgrp
;
519 struct perf_output_handle
{
520 struct perf_event
*event
;
521 struct ring_buffer
*rb
;
522 unsigned long wakeup
;
528 #ifdef CONFIG_PERF_EVENTS
530 extern int perf_pmu_register(struct pmu
*pmu
, const char *name
, int type
);
531 extern void perf_pmu_unregister(struct pmu
*pmu
);
533 extern int perf_num_counters(void);
534 extern const char *perf_pmu_name(void);
535 extern void __perf_event_task_sched_in(struct task_struct
*prev
,
536 struct task_struct
*task
);
537 extern void __perf_event_task_sched_out(struct task_struct
*prev
,
538 struct task_struct
*next
);
539 extern int perf_event_init_task(struct task_struct
*child
);
540 extern void perf_event_exit_task(struct task_struct
*child
);
541 extern void perf_event_free_task(struct task_struct
*task
);
542 extern void perf_event_delayed_put(struct task_struct
*task
);
543 extern void perf_event_print_debug(void);
544 extern void perf_pmu_disable(struct pmu
*pmu
);
545 extern void perf_pmu_enable(struct pmu
*pmu
);
546 extern int perf_event_task_disable(void);
547 extern int perf_event_task_enable(void);
548 extern int perf_event_refresh(struct perf_event
*event
, int refresh
);
549 extern void perf_event_update_userpage(struct perf_event
*event
);
550 extern int perf_event_release_kernel(struct perf_event
*event
);
551 extern struct perf_event
*
552 perf_event_create_kernel_counter(struct perf_event_attr
*attr
,
554 struct task_struct
*task
,
555 perf_overflow_handler_t callback
,
557 extern void perf_pmu_migrate_context(struct pmu
*pmu
,
558 int src_cpu
, int dst_cpu
);
559 extern u64
perf_event_read_value(struct perf_event
*event
,
560 u64
*enabled
, u64
*running
);
563 struct perf_sample_data
{
580 union perf_mem_data_src data_src
;
581 struct perf_callchain_entry
*callchain
;
582 struct perf_raw_record
*raw
;
583 struct perf_branch_stack
*br_stack
;
584 struct perf_regs_user regs_user
;
588 * Transaction flags for abort events:
593 static inline void perf_sample_data_init(struct perf_sample_data
*data
,
594 u64 addr
, u64 period
)
596 /* remaining struct members initialized in perf_prepare_sample() */
599 data
->br_stack
= NULL
;
600 data
->period
= period
;
601 data
->regs_user
.abi
= PERF_SAMPLE_REGS_ABI_NONE
;
602 data
->regs_user
.regs
= NULL
;
603 data
->stack_user_size
= 0;
605 data
->data_src
.val
= 0;
609 extern void perf_output_sample(struct perf_output_handle
*handle
,
610 struct perf_event_header
*header
,
611 struct perf_sample_data
*data
,
612 struct perf_event
*event
);
613 extern void perf_prepare_sample(struct perf_event_header
*header
,
614 struct perf_sample_data
*data
,
615 struct perf_event
*event
,
616 struct pt_regs
*regs
);
618 extern int perf_event_overflow(struct perf_event
*event
,
619 struct perf_sample_data
*data
,
620 struct pt_regs
*regs
);
622 static inline bool is_sampling_event(struct perf_event
*event
)
624 return event
->attr
.sample_period
!= 0;
628 * Return 1 for a software event, 0 for a hardware event
630 static inline int is_software_event(struct perf_event
*event
)
632 return event
->pmu
->task_ctx_nr
== perf_sw_context
;
635 extern struct static_key perf_swevent_enabled
[PERF_COUNT_SW_MAX
];
637 extern void __perf_sw_event(u32
, u64
, struct pt_regs
*, u64
);
639 #ifndef perf_arch_fetch_caller_regs
640 static inline void perf_arch_fetch_caller_regs(struct pt_regs
*regs
, unsigned long ip
) { }
644 * Take a snapshot of the regs. Skip ip and frame pointer to
645 * the nth caller. We only need a few of the regs:
646 * - ip for PERF_SAMPLE_IP
647 * - cs for user_mode() tests
648 * - bp for callchains
649 * - eflags, for future purposes, just in case
651 static inline void perf_fetch_caller_regs(struct pt_regs
*regs
)
653 memset(regs
, 0, sizeof(*regs
));
655 perf_arch_fetch_caller_regs(regs
, CALLER_ADDR0
);
658 static __always_inline
void
659 perf_sw_event(u32 event_id
, u64 nr
, struct pt_regs
*regs
, u64 addr
)
661 struct pt_regs hot_regs
;
663 if (static_key_false(&perf_swevent_enabled
[event_id
])) {
665 perf_fetch_caller_regs(&hot_regs
);
668 __perf_sw_event(event_id
, nr
, regs
, addr
);
672 extern struct static_key_deferred perf_sched_events
;
674 static inline void perf_event_task_sched_in(struct task_struct
*prev
,
675 struct task_struct
*task
)
677 if (static_key_false(&perf_sched_events
.key
))
678 __perf_event_task_sched_in(prev
, task
);
681 static inline void perf_event_task_sched_out(struct task_struct
*prev
,
682 struct task_struct
*next
)
684 perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES
, 1, NULL
, 0);
686 if (static_key_false(&perf_sched_events
.key
))
687 __perf_event_task_sched_out(prev
, next
);
690 extern void perf_event_mmap(struct vm_area_struct
*vma
);
691 extern struct perf_guest_info_callbacks
*perf_guest_cbs
;
692 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
693 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
695 extern void perf_event_comm(struct task_struct
*tsk
);
696 extern void perf_event_fork(struct task_struct
*tsk
);
699 DECLARE_PER_CPU(struct perf_callchain_entry
, perf_callchain_entry
);
701 extern void perf_callchain_user(struct perf_callchain_entry
*entry
, struct pt_regs
*regs
);
702 extern void perf_callchain_kernel(struct perf_callchain_entry
*entry
, struct pt_regs
*regs
);
704 static inline void perf_callchain_store(struct perf_callchain_entry
*entry
, u64 ip
)
706 if (entry
->nr
< PERF_MAX_STACK_DEPTH
)
707 entry
->ip
[entry
->nr
++] = ip
;
710 extern int sysctl_perf_event_paranoid
;
711 extern int sysctl_perf_event_mlock
;
712 extern int sysctl_perf_event_sample_rate
;
713 extern int sysctl_perf_cpu_time_max_percent
;
715 extern void perf_sample_event_took(u64 sample_len_ns
);
717 extern int perf_proc_update_handler(struct ctl_table
*table
, int write
,
718 void __user
*buffer
, size_t *lenp
,
720 extern int perf_cpu_time_max_percent_handler(struct ctl_table
*table
, int write
,
721 void __user
*buffer
, size_t *lenp
,
725 static inline bool perf_paranoid_tracepoint_raw(void)
727 return sysctl_perf_event_paranoid
> -1;
730 static inline bool perf_paranoid_cpu(void)
732 return sysctl_perf_event_paranoid
> 0;
735 static inline bool perf_paranoid_kernel(void)
737 return sysctl_perf_event_paranoid
> 1;
740 extern void perf_event_init(void);
741 extern void perf_tp_event(u64 addr
, u64 count
, void *record
,
742 int entry_size
, struct pt_regs
*regs
,
743 struct hlist_head
*head
, int rctx
,
744 struct task_struct
*task
);
745 extern void perf_bp_event(struct perf_event
*event
, void *data
);
747 #ifndef perf_misc_flags
748 # define perf_misc_flags(regs) \
749 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
750 # define perf_instruction_pointer(regs) instruction_pointer(regs)
753 static inline bool has_branch_stack(struct perf_event
*event
)
755 return event
->attr
.sample_type
& PERF_SAMPLE_BRANCH_STACK
;
758 extern int perf_output_begin(struct perf_output_handle
*handle
,
759 struct perf_event
*event
, unsigned int size
);
760 extern void perf_output_end(struct perf_output_handle
*handle
);
761 extern unsigned int perf_output_copy(struct perf_output_handle
*handle
,
762 const void *buf
, unsigned int len
);
763 extern unsigned int perf_output_skip(struct perf_output_handle
*handle
,
765 extern int perf_swevent_get_recursion_context(void);
766 extern void perf_swevent_put_recursion_context(int rctx
);
767 extern u64
perf_swevent_set_period(struct perf_event
*event
);
768 extern void perf_event_enable(struct perf_event
*event
);
769 extern void perf_event_disable(struct perf_event
*event
);
770 extern int __perf_event_disable(void *info
);
771 extern void perf_event_task_tick(void);
774 perf_event_task_sched_in(struct task_struct
*prev
,
775 struct task_struct
*task
) { }
777 perf_event_task_sched_out(struct task_struct
*prev
,
778 struct task_struct
*next
) { }
779 static inline int perf_event_init_task(struct task_struct
*child
) { return 0; }
780 static inline void perf_event_exit_task(struct task_struct
*child
) { }
781 static inline void perf_event_free_task(struct task_struct
*task
) { }
782 static inline void perf_event_delayed_put(struct task_struct
*task
) { }
783 static inline void perf_event_print_debug(void) { }
784 static inline int perf_event_task_disable(void) { return -EINVAL
; }
785 static inline int perf_event_task_enable(void) { return -EINVAL
; }
786 static inline int perf_event_refresh(struct perf_event
*event
, int refresh
)
792 perf_sw_event(u32 event_id
, u64 nr
, struct pt_regs
*regs
, u64 addr
) { }
794 perf_bp_event(struct perf_event
*event
, void *data
) { }
796 static inline int perf_register_guest_info_callbacks
797 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
798 static inline int perf_unregister_guest_info_callbacks
799 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
801 static inline void perf_event_mmap(struct vm_area_struct
*vma
) { }
802 static inline void perf_event_comm(struct task_struct
*tsk
) { }
803 static inline void perf_event_fork(struct task_struct
*tsk
) { }
804 static inline void perf_event_init(void) { }
805 static inline int perf_swevent_get_recursion_context(void) { return -1; }
806 static inline void perf_swevent_put_recursion_context(int rctx
) { }
807 static inline u64
perf_swevent_set_period(struct perf_event
*event
) { return 0; }
808 static inline void perf_event_enable(struct perf_event
*event
) { }
809 static inline void perf_event_disable(struct perf_event
*event
) { }
810 static inline int __perf_event_disable(void *info
) { return -1; }
811 static inline void perf_event_task_tick(void) { }
814 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
815 extern bool perf_event_can_stop_tick(void);
817 static inline bool perf_event_can_stop_tick(void) { return true; }
820 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
821 extern void perf_restore_debug_store(void);
823 static inline void perf_restore_debug_store(void) { }
826 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
829 * This has to have a higher priority than migration_notifier in sched/core.c.
831 #define perf_cpu_notifier(fn) \
833 static struct notifier_block fn##_nb = \
834 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
835 unsigned long cpu = smp_processor_id(); \
836 unsigned long flags; \
837 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
838 (void *)(unsigned long)cpu); \
839 local_irq_save(flags); \
840 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
841 (void *)(unsigned long)cpu); \
842 local_irq_restore(flags); \
843 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
844 (void *)(unsigned long)cpu); \
845 register_cpu_notifier(&fn##_nb); \
849 struct perf_pmu_events_attr
{
850 struct device_attribute attr
;
852 const char *event_str
;
855 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
856 static struct perf_pmu_events_attr _var = { \
857 .attr = __ATTR(_name, 0444, _show, NULL), \
861 #define PMU_FORMAT_ATTR(_name, _format) \
863 _name##_show(struct device *dev, \
864 struct device_attribute *attr, \
867 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
868 return sprintf(page, _format "\n"); \
871 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
873 #endif /* _LINUX_PERF_EVENT_H */