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];
82 struct perf_regs_user {
90 * extra PMU register associated with an event
92 struct hw_perf_event_extra {
93 u64 config; /* register value */
94 unsigned int reg; /* register address or index */
95 int alloc; /* extra register already allocated */
96 int idx; /* index in shared_regs->regs[] */
99 struct event_constraint;
102 * struct hw_perf_event - performance event hardware details:
104 struct hw_perf_event {
105 #ifdef CONFIG_PERF_EVENTS
107 struct { /* hardware */
110 unsigned long config_base;
111 unsigned long event_base;
112 int event_base_rdpmc;
117 struct hw_perf_event_extra extra_reg;
118 struct hw_perf_event_extra branch_reg;
120 struct event_constraint *constraint;
122 struct { /* software */
123 struct hrtimer hrtimer;
125 struct { /* tracepoint */
126 struct task_struct *tp_target;
127 /* for tp_event->class */
128 struct list_head tp_list;
130 #ifdef CONFIG_HAVE_HW_BREAKPOINT
131 struct { /* breakpoint */
133 * Crufty hack to avoid the chicken and egg
134 * problem hw_breakpoint has with context
135 * creation and event initalization.
137 struct task_struct *bp_target;
138 struct arch_hw_breakpoint info;
139 struct list_head bp_list;
144 local64_t prev_count;
147 local64_t period_left;
152 u64 freq_count_stamp;
157 * hw_perf_event::state flags
159 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
160 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
161 #define PERF_HES_ARCH 0x04
166 * Common implementation detail of pmu::{start,commit,cancel}_txn
168 #define PERF_EVENT_TXN 0x1
171 * pmu::capabilities flags
173 #define PERF_PMU_CAP_NO_INTERRUPT 0x01
176 * struct pmu - generic performance monitoring unit
179 struct list_head entry;
181 struct module *module;
183 const struct attribute_group **attr_groups;
188 * various common per-pmu feature flags
192 int * __percpu pmu_disable_count;
193 struct perf_cpu_context * __percpu pmu_cpu_context;
195 int hrtimer_interval_ms;
198 * Fully disable/enable this PMU, can be used to protect from the PMI
199 * as well as for lazy/batch writing of the MSRs.
201 void (*pmu_enable) (struct pmu *pmu); /* optional */
202 void (*pmu_disable) (struct pmu *pmu); /* optional */
205 * Try and initialize the event for this PMU.
206 * Should return -ENOENT when the @event doesn't match this PMU.
208 int (*event_init) (struct perf_event *event);
210 #define PERF_EF_START 0x01 /* start the counter when adding */
211 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
212 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
215 * Adds/Removes a counter to/from the PMU, can be done inside
216 * a transaction, see the ->*_txn() methods.
218 int (*add) (struct perf_event *event, int flags);
219 void (*del) (struct perf_event *event, int flags);
222 * Starts/Stops a counter present on the PMU. The PMI handler
223 * should stop the counter when perf_event_overflow() returns
224 * !0. ->start() will be used to continue.
226 void (*start) (struct perf_event *event, int flags);
227 void (*stop) (struct perf_event *event, int flags);
230 * Updates the counter value of the event.
232 void (*read) (struct perf_event *event);
235 * Group events scheduling is treated as a transaction, add
236 * group events as a whole and perform one schedulability test.
237 * If the test fails, roll back the whole group
239 * Start the transaction, after this ->add() doesn't need to
240 * do schedulability tests.
242 void (*start_txn) (struct pmu *pmu); /* optional */
244 * If ->start_txn() disabled the ->add() schedulability test
245 * then ->commit_txn() is required to perform one. On success
246 * the transaction is closed. On error the transaction is kept
247 * open until ->cancel_txn() is called.
249 int (*commit_txn) (struct pmu *pmu); /* optional */
251 * Will cancel the transaction, assumes ->del() is called
252 * for each successful ->add() during the transaction.
254 void (*cancel_txn) (struct pmu *pmu); /* optional */
257 * Will return the value for perf_event_mmap_page::index for this event,
258 * if no implementation is provided it will default to: event->hw.idx + 1.
260 int (*event_idx) (struct perf_event *event); /*optional */
263 * flush branch stack on context-switches (needed in cpu-wide mode)
265 void (*flush_branch_stack) (void);
269 * enum perf_event_active_state - the states of a event
271 enum perf_event_active_state {
272 PERF_EVENT_STATE_ERROR = -2,
273 PERF_EVENT_STATE_OFF = -1,
274 PERF_EVENT_STATE_INACTIVE = 0,
275 PERF_EVENT_STATE_ACTIVE = 1,
279 struct perf_sample_data;
281 typedef void (*perf_overflow_handler_t)(struct perf_event *,
282 struct perf_sample_data *,
283 struct pt_regs *regs);
285 enum perf_group_flag {
286 PERF_GROUP_SOFTWARE = 0x1,
289 #define SWEVENT_HLIST_BITS 8
290 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
292 struct swevent_hlist {
293 struct hlist_head heads[SWEVENT_HLIST_SIZE];
294 struct rcu_head rcu_head;
297 #define PERF_ATTACH_CONTEXT 0x01
298 #define PERF_ATTACH_GROUP 0x02
299 #define PERF_ATTACH_TASK 0x04
305 * struct perf_event - performance event kernel representation:
308 #ifdef CONFIG_PERF_EVENTS
310 * entry onto perf_event_context::event_list;
311 * modifications require ctx->lock
312 * RCU safe iterations.
314 struct list_head event_entry;
317 * XXX: group_entry and sibling_list should be mutually exclusive;
318 * either you're a sibling on a group, or you're the group leader.
319 * Rework the code to always use the same list element.
321 * Locked for modification by both ctx->mutex and ctx->lock; holding
322 * either sufficies for read.
324 struct list_head group_entry;
325 struct list_head sibling_list;
328 * We need storage to track the entries in perf_pmu_migrate_context; we
329 * cannot use the event_entry because of RCU and we want to keep the
330 * group in tact which avoids us using the other two entries.
332 struct list_head migrate_entry;
334 struct hlist_node hlist_entry;
335 struct list_head active_entry;
338 struct perf_event *group_leader;
341 enum perf_event_active_state state;
342 unsigned int attach_state;
344 atomic64_t child_count;
347 * These are the total time in nanoseconds that the event
348 * has been enabled (i.e. eligible to run, and the task has
349 * been scheduled in, if this is a per-task event)
350 * and running (scheduled onto the CPU), respectively.
352 * They are computed from tstamp_enabled, tstamp_running and
353 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
355 u64 total_time_enabled;
356 u64 total_time_running;
359 * These are timestamps used for computing total_time_enabled
360 * and total_time_running when the event is in INACTIVE or
361 * ACTIVE state, measured in nanoseconds from an arbitrary point
363 * tstamp_enabled: the notional time when the event was enabled
364 * tstamp_running: the notional time when the event was scheduled on
365 * tstamp_stopped: in INACTIVE state, the notional time when the
366 * event was scheduled off.
373 * timestamp shadows the actual context timing but it can
374 * be safely used in NMI interrupt context. It reflects the
375 * context time as it was when the event was last scheduled in.
377 * ctx_time already accounts for ctx->timestamp. Therefore to
378 * compute ctx_time for a sample, simply add perf_clock().
382 struct perf_event_attr attr;
386 struct hw_perf_event hw;
388 struct perf_event_context *ctx;
389 atomic_long_t refcount;
392 * These accumulate total time (in nanoseconds) that children
393 * events have been enabled and running, respectively.
395 atomic64_t child_total_time_enabled;
396 atomic64_t child_total_time_running;
399 * Protect attach/detach and child_list:
401 struct mutex child_mutex;
402 struct list_head child_list;
403 struct perf_event *parent;
408 struct list_head owner_entry;
409 struct task_struct *owner;
412 struct mutex mmap_mutex;
415 struct ring_buffer *rb;
416 struct list_head rb_entry;
417 unsigned long rcu_batches;
421 wait_queue_head_t waitq;
422 struct fasync_struct *fasync;
424 /* delayed work for NMIs and such */
428 struct irq_work pending;
430 atomic_t event_limit;
432 void (*destroy)(struct perf_event *);
433 struct rcu_head rcu_head;
435 struct pid_namespace *ns;
438 perf_overflow_handler_t overflow_handler;
439 void *overflow_handler_context;
441 #ifdef CONFIG_EVENT_TRACING
442 struct ftrace_event_call *tp_event;
443 struct event_filter *filter;
444 #ifdef CONFIG_FUNCTION_TRACER
445 struct ftrace_ops ftrace_ops;
449 #ifdef CONFIG_CGROUP_PERF
450 struct perf_cgroup *cgrp; /* cgroup event is attach to */
451 int cgrp_defer_enabled;
454 #endif /* CONFIG_PERF_EVENTS */
457 enum perf_event_context_type {
463 * struct perf_event_context - event context structure
465 * Used as a container for task events and CPU events as well:
467 struct perf_event_context {
469 enum perf_event_context_type type;
471 * Protect the states of the events in the list,
472 * nr_active, and the list:
476 * Protect the list of events. Locking either mutex or lock
477 * is sufficient to ensure the list doesn't change; to change
478 * the list you need to lock both the mutex and the spinlock.
482 struct list_head pinned_groups;
483 struct list_head flexible_groups;
484 struct list_head event_list;
492 struct task_struct *task;
495 * Context clock, runs when context enabled.
501 * These fields let us detect when two contexts have both
502 * been cloned (inherited) from a common ancestor.
504 struct perf_event_context *parent_ctx;
508 int nr_cgroups; /* cgroup evts */
509 int nr_branch_stack; /* branch_stack evt */
510 struct rcu_head rcu_head;
512 struct delayed_work orphans_remove;
513 bool orphans_remove_sched;
517 * Number of contexts where an event can trigger:
518 * task, softirq, hardirq, nmi.
520 #define PERF_NR_CONTEXTS 4
523 * struct perf_event_cpu_context - per cpu event context structure
525 struct perf_cpu_context {
526 struct perf_event_context ctx;
527 struct perf_event_context *task_ctx;
530 struct hrtimer hrtimer;
531 ktime_t hrtimer_interval;
532 struct list_head rotation_list;
533 struct pmu *unique_pmu;
534 struct perf_cgroup *cgrp;
537 struct perf_output_handle {
538 struct perf_event *event;
539 struct ring_buffer *rb;
540 unsigned long wakeup;
546 #ifdef CONFIG_PERF_EVENTS
548 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
549 extern void perf_pmu_unregister(struct pmu *pmu);
551 extern int perf_num_counters(void);
552 extern const char *perf_pmu_name(void);
553 extern void __perf_event_task_sched_in(struct task_struct *prev,
554 struct task_struct *task);
555 extern void __perf_event_task_sched_out(struct task_struct *prev,
556 struct task_struct *next);
557 extern int perf_event_init_task(struct task_struct *child);
558 extern void perf_event_exit_task(struct task_struct *child);
559 extern void perf_event_free_task(struct task_struct *task);
560 extern void perf_event_delayed_put(struct task_struct *task);
561 extern void perf_event_print_debug(void);
562 extern void perf_pmu_disable(struct pmu *pmu);
563 extern void perf_pmu_enable(struct pmu *pmu);
564 extern int perf_event_task_disable(void);
565 extern int perf_event_task_enable(void);
566 extern int perf_event_refresh(struct perf_event *event, int refresh);
567 extern void perf_event_update_userpage(struct perf_event *event);
568 extern int perf_event_release_kernel(struct perf_event *event);
569 extern struct perf_event *
570 perf_event_create_kernel_counter(struct perf_event_attr *attr,
572 struct task_struct *task,
573 perf_overflow_handler_t callback,
575 extern void perf_pmu_migrate_context(struct pmu *pmu,
576 int src_cpu, int dst_cpu);
577 extern u64 perf_event_read_value(struct perf_event *event,
578 u64 *enabled, u64 *running);
581 struct perf_sample_data {
598 union perf_mem_data_src data_src;
599 struct perf_callchain_entry *callchain;
600 struct perf_raw_record *raw;
601 struct perf_branch_stack *br_stack;
602 struct perf_regs_user regs_user;
606 * Transaction flags for abort events:
611 /* default value for data source */
612 #define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\
613 PERF_MEM_S(LVL, NA) |\
614 PERF_MEM_S(SNOOP, NA) |\
615 PERF_MEM_S(LOCK, NA) |\
618 static inline void perf_sample_data_init(struct perf_sample_data *data,
619 u64 addr, u64 period)
621 /* remaining struct members initialized in perf_prepare_sample() */
624 data->br_stack = NULL;
625 data->period = period;
626 data->regs_user.abi = PERF_SAMPLE_REGS_ABI_NONE;
627 data->regs_user.regs = NULL;
628 data->stack_user_size = 0;
630 data->data_src.val = PERF_MEM_NA;
634 extern void perf_output_sample(struct perf_output_handle *handle,
635 struct perf_event_header *header,
636 struct perf_sample_data *data,
637 struct perf_event *event);
638 extern void perf_prepare_sample(struct perf_event_header *header,
639 struct perf_sample_data *data,
640 struct perf_event *event,
641 struct pt_regs *regs);
643 extern int perf_event_overflow(struct perf_event *event,
644 struct perf_sample_data *data,
645 struct pt_regs *regs);
647 static inline bool is_sampling_event(struct perf_event *event)
649 return event->attr.sample_period != 0;
653 * Return 1 for a software event, 0 for a hardware event
655 static inline int is_software_event(struct perf_event *event)
657 return event->pmu->task_ctx_nr == perf_sw_context;
660 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
662 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
664 #ifndef perf_arch_fetch_caller_regs
665 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
669 * Take a snapshot of the regs. Skip ip and frame pointer to
670 * the nth caller. We only need a few of the regs:
671 * - ip for PERF_SAMPLE_IP
672 * - cs for user_mode() tests
673 * - bp for callchains
674 * - eflags, for future purposes, just in case
676 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
678 memset(regs, 0, sizeof(*regs));
680 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
683 static __always_inline void
684 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
686 struct pt_regs hot_regs;
688 if (static_key_false(&perf_swevent_enabled[event_id])) {
690 perf_fetch_caller_regs(&hot_regs);
693 __perf_sw_event(event_id, nr, regs, addr);
697 extern struct static_key_deferred perf_sched_events;
699 static inline void perf_event_task_sched_in(struct task_struct *prev,
700 struct task_struct *task)
702 if (static_key_false(&perf_sched_events.key))
703 __perf_event_task_sched_in(prev, task);
706 static inline void perf_event_task_sched_out(struct task_struct *prev,
707 struct task_struct *next)
709 perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0);
711 if (static_key_false(&perf_sched_events.key))
712 __perf_event_task_sched_out(prev, next);
715 extern void perf_event_mmap(struct vm_area_struct *vma);
716 extern struct perf_guest_info_callbacks *perf_guest_cbs;
717 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
718 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
720 extern void perf_event_exec(void);
721 extern void perf_event_comm(struct task_struct *tsk, bool exec);
722 extern void perf_event_fork(struct task_struct *tsk);
725 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
727 extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
728 extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
730 static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
732 if (entry->nr < PERF_MAX_STACK_DEPTH)
733 entry->ip[entry->nr++] = ip;
736 extern int sysctl_perf_event_paranoid;
737 extern int sysctl_perf_event_mlock;
738 extern int sysctl_perf_event_sample_rate;
739 extern int sysctl_perf_cpu_time_max_percent;
741 extern void perf_sample_event_took(u64 sample_len_ns);
743 extern int perf_proc_update_handler(struct ctl_table *table, int write,
744 void __user *buffer, size_t *lenp,
746 extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
747 void __user *buffer, size_t *lenp,
751 static inline bool perf_paranoid_tracepoint_raw(void)
753 return sysctl_perf_event_paranoid > -1;
756 static inline bool perf_paranoid_cpu(void)
758 return sysctl_perf_event_paranoid > 0;
761 static inline bool perf_paranoid_kernel(void)
763 return sysctl_perf_event_paranoid > 1;
766 extern void perf_event_init(void);
767 extern void perf_tp_event(u64 addr, u64 count, void *record,
768 int entry_size, struct pt_regs *regs,
769 struct hlist_head *head, int rctx,
770 struct task_struct *task);
771 extern void perf_bp_event(struct perf_event *event, void *data);
773 #ifndef perf_misc_flags
774 # define perf_misc_flags(regs) \
775 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
776 # define perf_instruction_pointer(regs) instruction_pointer(regs)
779 static inline bool has_branch_stack(struct perf_event *event)
781 return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
784 extern int perf_output_begin(struct perf_output_handle *handle,
785 struct perf_event *event, unsigned int size);
786 extern void perf_output_end(struct perf_output_handle *handle);
787 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
788 const void *buf, unsigned int len);
789 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
791 extern int perf_swevent_get_recursion_context(void);
792 extern void perf_swevent_put_recursion_context(int rctx);
793 extern u64 perf_swevent_set_period(struct perf_event *event);
794 extern void perf_event_enable(struct perf_event *event);
795 extern void perf_event_disable(struct perf_event *event);
796 extern int __perf_event_disable(void *info);
797 extern void perf_event_task_tick(void);
798 #else /* !CONFIG_PERF_EVENTS: */
800 perf_event_task_sched_in(struct task_struct *prev,
801 struct task_struct *task) { }
803 perf_event_task_sched_out(struct task_struct *prev,
804 struct task_struct *next) { }
805 static inline int perf_event_init_task(struct task_struct *child) { return 0; }
806 static inline void perf_event_exit_task(struct task_struct *child) { }
807 static inline void perf_event_free_task(struct task_struct *task) { }
808 static inline void perf_event_delayed_put(struct task_struct *task) { }
809 static inline void perf_event_print_debug(void) { }
810 static inline int perf_event_task_disable(void) { return -EINVAL; }
811 static inline int perf_event_task_enable(void) { return -EINVAL; }
812 static inline int perf_event_refresh(struct perf_event *event, int refresh)
818 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
820 perf_bp_event(struct perf_event *event, void *data) { }
822 static inline int perf_register_guest_info_callbacks
823 (struct perf_guest_info_callbacks *callbacks) { return 0; }
824 static inline int perf_unregister_guest_info_callbacks
825 (struct perf_guest_info_callbacks *callbacks) { return 0; }
827 static inline void perf_event_mmap(struct vm_area_struct *vma) { }
828 static inline void perf_event_exec(void) { }
829 static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
830 static inline void perf_event_fork(struct task_struct *tsk) { }
831 static inline void perf_event_init(void) { }
832 static inline int perf_swevent_get_recursion_context(void) { return -1; }
833 static inline void perf_swevent_put_recursion_context(int rctx) { }
834 static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; }
835 static inline void perf_event_enable(struct perf_event *event) { }
836 static inline void perf_event_disable(struct perf_event *event) { }
837 static inline int __perf_event_disable(void *info) { return -1; }
838 static inline void perf_event_task_tick(void) { }
841 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
842 extern bool perf_event_can_stop_tick(void);
844 static inline bool perf_event_can_stop_tick(void) { return true; }
847 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
848 extern void perf_restore_debug_store(void);
850 static inline void perf_restore_debug_store(void) { }
853 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
856 * This has to have a higher priority than migration_notifier in sched/core.c.
858 #define perf_cpu_notifier(fn) \
860 static struct notifier_block fn##_nb = \
861 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
862 unsigned long cpu = smp_processor_id(); \
863 unsigned long flags; \
865 cpu_notifier_register_begin(); \
866 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
867 (void *)(unsigned long)cpu); \
868 local_irq_save(flags); \
869 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
870 (void *)(unsigned long)cpu); \
871 local_irq_restore(flags); \
872 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
873 (void *)(unsigned long)cpu); \
874 __register_cpu_notifier(&fn##_nb); \
875 cpu_notifier_register_done(); \
879 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
880 * callback for already online CPUs.
882 #define __perf_cpu_notifier(fn) \
884 static struct notifier_block fn##_nb = \
885 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
887 __register_cpu_notifier(&fn##_nb); \
890 struct perf_pmu_events_attr {
891 struct device_attribute attr;
893 const char *event_str;
896 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
897 static struct perf_pmu_events_attr _var = { \
898 .attr = __ATTR(_name, 0444, _show, NULL), \
902 #define PMU_FORMAT_ATTR(_name, _format) \
904 _name##_show(struct device *dev, \
905 struct device_attribute *attr, \
908 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
909 return sprintf(page, _format "\n"); \
912 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
914 #endif /* _LINUX_PERF_EVENT_H */