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;
323 struct list_head active_entry;
326 struct perf_event *group_leader;
329 enum perf_event_active_state state;
330 unsigned int attach_state;
332 atomic64_t child_count;
335 * These are the total time in nanoseconds that the event
336 * has been enabled (i.e. eligible to run, and the task has
337 * been scheduled in, if this is a per-task event)
338 * and running (scheduled onto the CPU), respectively.
340 * They are computed from tstamp_enabled, tstamp_running and
341 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
343 u64 total_time_enabled;
344 u64 total_time_running;
347 * These are timestamps used for computing total_time_enabled
348 * and total_time_running when the event is in INACTIVE or
349 * ACTIVE state, measured in nanoseconds from an arbitrary point
351 * tstamp_enabled: the notional time when the event was enabled
352 * tstamp_running: the notional time when the event was scheduled on
353 * tstamp_stopped: in INACTIVE state, the notional time when the
354 * event was scheduled off.
361 * timestamp shadows the actual context timing but it can
362 * be safely used in NMI interrupt context. It reflects the
363 * context time as it was when the event was last scheduled in.
365 * ctx_time already accounts for ctx->timestamp. Therefore to
366 * compute ctx_time for a sample, simply add perf_clock().
370 struct perf_event_attr attr;
374 struct hw_perf_event hw;
376 struct perf_event_context *ctx;
377 atomic_long_t refcount;
380 * These accumulate total time (in nanoseconds) that children
381 * events have been enabled and running, respectively.
383 atomic64_t child_total_time_enabled;
384 atomic64_t child_total_time_running;
387 * Protect attach/detach and child_list:
389 struct mutex child_mutex;
390 struct list_head child_list;
391 struct perf_event *parent;
396 struct list_head owner_entry;
397 struct task_struct *owner;
400 struct mutex mmap_mutex;
403 struct ring_buffer *rb;
404 struct list_head rb_entry;
405 unsigned long rcu_batches;
409 wait_queue_head_t waitq;
410 struct fasync_struct *fasync;
412 /* delayed work for NMIs and such */
416 struct irq_work pending;
418 atomic_t event_limit;
420 void (*destroy)(struct perf_event *);
421 struct rcu_head rcu_head;
423 struct pid_namespace *ns;
426 perf_overflow_handler_t overflow_handler;
427 void *overflow_handler_context;
429 #ifdef CONFIG_EVENT_TRACING
430 struct ftrace_event_call *tp_event;
431 struct event_filter *filter;
432 #ifdef CONFIG_FUNCTION_TRACER
433 struct ftrace_ops ftrace_ops;
437 #ifdef CONFIG_CGROUP_PERF
438 struct perf_cgroup *cgrp; /* cgroup event is attach to */
439 int cgrp_defer_enabled;
442 #endif /* CONFIG_PERF_EVENTS */
445 enum perf_event_context_type {
451 * struct perf_event_context - event context structure
453 * Used as a container for task events and CPU events as well:
455 struct perf_event_context {
457 enum perf_event_context_type type;
459 * Protect the states of the events in the list,
460 * nr_active, and the list:
464 * Protect the list of events. Locking either mutex or lock
465 * is sufficient to ensure the list doesn't change; to change
466 * the list you need to lock both the mutex and the spinlock.
470 struct list_head pinned_groups;
471 struct list_head flexible_groups;
472 struct list_head event_list;
480 struct task_struct *task;
483 * Context clock, runs when context enabled.
489 * These fields let us detect when two contexts have both
490 * been cloned (inherited) from a common ancestor.
492 struct perf_event_context *parent_ctx;
496 int nr_cgroups; /* cgroup evts */
497 int nr_branch_stack; /* branch_stack evt */
498 struct rcu_head rcu_head;
502 * Number of contexts where an event can trigger:
503 * task, softirq, hardirq, nmi.
505 #define PERF_NR_CONTEXTS 4
508 * struct perf_event_cpu_context - per cpu event context structure
510 struct perf_cpu_context {
511 struct perf_event_context ctx;
512 struct perf_event_context *task_ctx;
515 struct hrtimer hrtimer;
516 ktime_t hrtimer_interval;
517 struct list_head rotation_list;
518 struct pmu *unique_pmu;
519 struct perf_cgroup *cgrp;
522 struct perf_output_handle {
523 struct perf_event *event;
524 struct ring_buffer *rb;
525 unsigned long wakeup;
531 #ifdef CONFIG_PERF_EVENTS
533 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
534 extern void perf_pmu_unregister(struct pmu *pmu);
536 extern int perf_num_counters(void);
537 extern const char *perf_pmu_name(void);
538 extern void __perf_event_task_sched_in(struct task_struct *prev,
539 struct task_struct *task);
540 extern void __perf_event_task_sched_out(struct task_struct *prev,
541 struct task_struct *next);
542 extern int perf_event_init_task(struct task_struct *child);
543 extern void perf_event_exit_task(struct task_struct *child);
544 extern void perf_event_free_task(struct task_struct *task);
545 extern void perf_event_delayed_put(struct task_struct *task);
546 extern void perf_event_print_debug(void);
547 extern void perf_pmu_disable(struct pmu *pmu);
548 extern void perf_pmu_enable(struct pmu *pmu);
549 extern int perf_event_task_disable(void);
550 extern int perf_event_task_enable(void);
551 extern int perf_event_refresh(struct perf_event *event, int refresh);
552 extern void perf_event_update_userpage(struct perf_event *event);
553 extern int perf_event_release_kernel(struct perf_event *event);
554 extern struct perf_event *
555 perf_event_create_kernel_counter(struct perf_event_attr *attr,
557 struct task_struct *task,
558 perf_overflow_handler_t callback,
560 extern void perf_pmu_migrate_context(struct pmu *pmu,
561 int src_cpu, int dst_cpu);
562 extern u64 perf_event_read_value(struct perf_event *event,
563 u64 *enabled, u64 *running);
566 struct perf_sample_data {
583 union perf_mem_data_src data_src;
584 struct perf_callchain_entry *callchain;
585 struct perf_raw_record *raw;
586 struct perf_branch_stack *br_stack;
587 struct perf_regs_user regs_user;
591 * Transaction flags for abort events:
596 static inline void perf_sample_data_init(struct perf_sample_data *data,
597 u64 addr, u64 period)
599 /* remaining struct members initialized in perf_prepare_sample() */
602 data->br_stack = NULL;
603 data->period = period;
604 data->regs_user.abi = PERF_SAMPLE_REGS_ABI_NONE;
605 data->regs_user.regs = NULL;
606 data->stack_user_size = 0;
608 data->data_src.val = 0;
612 extern void perf_output_sample(struct perf_output_handle *handle,
613 struct perf_event_header *header,
614 struct perf_sample_data *data,
615 struct perf_event *event);
616 extern void perf_prepare_sample(struct perf_event_header *header,
617 struct perf_sample_data *data,
618 struct perf_event *event,
619 struct pt_regs *regs);
621 extern int perf_event_overflow(struct perf_event *event,
622 struct perf_sample_data *data,
623 struct pt_regs *regs);
625 static inline bool is_sampling_event(struct perf_event *event)
627 return event->attr.sample_period != 0;
631 * Return 1 for a software event, 0 for a hardware event
633 static inline int is_software_event(struct perf_event *event)
635 return event->pmu->task_ctx_nr == perf_sw_context;
638 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
640 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
642 #ifndef perf_arch_fetch_caller_regs
643 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
647 * Take a snapshot of the regs. Skip ip and frame pointer to
648 * the nth caller. We only need a few of the regs:
649 * - ip for PERF_SAMPLE_IP
650 * - cs for user_mode() tests
651 * - bp for callchains
652 * - eflags, for future purposes, just in case
654 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
656 memset(regs, 0, sizeof(*regs));
658 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
661 static __always_inline void
662 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
664 struct pt_regs hot_regs;
666 if (static_key_false(&perf_swevent_enabled[event_id])) {
668 perf_fetch_caller_regs(&hot_regs);
671 __perf_sw_event(event_id, nr, regs, addr);
675 extern struct static_key_deferred perf_sched_events;
677 static inline void perf_event_task_sched_in(struct task_struct *prev,
678 struct task_struct *task)
680 if (static_key_false(&perf_sched_events.key))
681 __perf_event_task_sched_in(prev, task);
684 static inline void perf_event_task_sched_out(struct task_struct *prev,
685 struct task_struct *next)
687 perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0);
689 if (static_key_false(&perf_sched_events.key))
690 __perf_event_task_sched_out(prev, next);
693 extern void perf_event_mmap(struct vm_area_struct *vma);
694 extern struct perf_guest_info_callbacks *perf_guest_cbs;
695 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
696 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
698 extern void perf_event_comm(struct task_struct *tsk);
699 extern void perf_event_fork(struct task_struct *tsk);
702 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
704 extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
705 extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
707 static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
709 if (entry->nr < PERF_MAX_STACK_DEPTH)
710 entry->ip[entry->nr++] = ip;
713 extern int sysctl_perf_event_paranoid;
714 extern int sysctl_perf_event_mlock;
715 extern int sysctl_perf_event_sample_rate;
716 extern int sysctl_perf_cpu_time_max_percent;
718 extern void perf_sample_event_took(u64 sample_len_ns);
720 extern int perf_proc_update_handler(struct ctl_table *table, int write,
721 void __user *buffer, size_t *lenp,
723 extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
724 void __user *buffer, size_t *lenp,
728 static inline bool perf_paranoid_tracepoint_raw(void)
730 return sysctl_perf_event_paranoid > -1;
733 static inline bool perf_paranoid_cpu(void)
735 return sysctl_perf_event_paranoid > 0;
738 static inline bool perf_paranoid_kernel(void)
740 return sysctl_perf_event_paranoid > 1;
743 extern void perf_event_init(void);
744 extern void perf_tp_event(u64 addr, u64 count, void *record,
745 int entry_size, struct pt_regs *regs,
746 struct hlist_head *head, int rctx,
747 struct task_struct *task);
748 extern void perf_bp_event(struct perf_event *event, void *data);
750 #ifndef perf_misc_flags
751 # define perf_misc_flags(regs) \
752 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
753 # define perf_instruction_pointer(regs) instruction_pointer(regs)
756 static inline bool has_branch_stack(struct perf_event *event)
758 return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
761 extern int perf_output_begin(struct perf_output_handle *handle,
762 struct perf_event *event, unsigned int size);
763 extern void perf_output_end(struct perf_output_handle *handle);
764 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
765 const void *buf, unsigned int len);
766 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
768 extern int perf_swevent_get_recursion_context(void);
769 extern void perf_swevent_put_recursion_context(int rctx);
770 extern u64 perf_swevent_set_period(struct perf_event *event);
771 extern void perf_event_enable(struct perf_event *event);
772 extern void perf_event_disable(struct perf_event *event);
773 extern int __perf_event_disable(void *info);
774 extern void perf_event_task_tick(void);
777 perf_event_task_sched_in(struct task_struct *prev,
778 struct task_struct *task) { }
780 perf_event_task_sched_out(struct task_struct *prev,
781 struct task_struct *next) { }
782 static inline int perf_event_init_task(struct task_struct *child) { return 0; }
783 static inline void perf_event_exit_task(struct task_struct *child) { }
784 static inline void perf_event_free_task(struct task_struct *task) { }
785 static inline void perf_event_delayed_put(struct task_struct *task) { }
786 static inline void perf_event_print_debug(void) { }
787 static inline int perf_event_task_disable(void) { return -EINVAL; }
788 static inline int perf_event_task_enable(void) { return -EINVAL; }
789 static inline int perf_event_refresh(struct perf_event *event, int refresh)
795 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
797 perf_bp_event(struct perf_event *event, void *data) { }
799 static inline int perf_register_guest_info_callbacks
800 (struct perf_guest_info_callbacks *callbacks) { return 0; }
801 static inline int perf_unregister_guest_info_callbacks
802 (struct perf_guest_info_callbacks *callbacks) { return 0; }
804 static inline void perf_event_mmap(struct vm_area_struct *vma) { }
805 static inline void perf_event_comm(struct task_struct *tsk) { }
806 static inline void perf_event_fork(struct task_struct *tsk) { }
807 static inline void perf_event_init(void) { }
808 static inline int perf_swevent_get_recursion_context(void) { return -1; }
809 static inline void perf_swevent_put_recursion_context(int rctx) { }
810 static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; }
811 static inline void perf_event_enable(struct perf_event *event) { }
812 static inline void perf_event_disable(struct perf_event *event) { }
813 static inline int __perf_event_disable(void *info) { return -1; }
814 static inline void perf_event_task_tick(void) { }
817 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
818 extern bool perf_event_can_stop_tick(void);
820 static inline bool perf_event_can_stop_tick(void) { return true; }
823 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
824 extern void perf_restore_debug_store(void);
826 static inline void perf_restore_debug_store(void) { }
829 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
832 * This has to have a higher priority than migration_notifier in sched/core.c.
834 #define perf_cpu_notifier(fn) \
836 static struct notifier_block fn##_nb = \
837 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
838 unsigned long cpu = smp_processor_id(); \
839 unsigned long flags; \
841 cpu_notifier_register_begin(); \
842 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
843 (void *)(unsigned long)cpu); \
844 local_irq_save(flags); \
845 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
846 (void *)(unsigned long)cpu); \
847 local_irq_restore(flags); \
848 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
849 (void *)(unsigned long)cpu); \
850 __register_cpu_notifier(&fn##_nb); \
851 cpu_notifier_register_done(); \
855 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
856 * callback for already online CPUs.
858 #define __perf_cpu_notifier(fn) \
860 static struct notifier_block fn##_nb = \
861 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
863 __register_cpu_notifier(&fn##_nb); \
866 struct perf_pmu_events_attr {
867 struct device_attribute attr;
869 const char *event_str;
872 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
873 static struct perf_pmu_events_attr _var = { \
874 .attr = __ATTR(_name, 0444, _show, NULL), \
878 #define PMU_FORMAT_ATTR(_name, _format) \
880 _name##_show(struct device *dev, \
881 struct device_attribute *attr, \
884 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
885 return sprintf(page, _format "\n"); \
888 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
890 #endif /* _LINUX_PERF_EVENT_H */