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);
206 * Notification that the event was mapped or unmapped. Called
207 * in the context of the mapping task.
209 void (*event_mapped) (struct perf_event *event); /*optional*/
210 void (*event_unmapped) (struct perf_event *event); /*optional*/
212 #define PERF_EF_START 0x01 /* start the counter when adding */
213 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
214 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
217 * Adds/Removes a counter to/from the PMU, can be done inside
218 * a transaction, see the ->*_txn() methods.
220 int (*add) (struct perf_event *event, int flags);
221 void (*del) (struct perf_event *event, int flags);
224 * Starts/Stops a counter present on the PMU. The PMI handler
225 * should stop the counter when perf_event_overflow() returns
226 * !0. ->start() will be used to continue.
228 void (*start) (struct perf_event *event, int flags);
229 void (*stop) (struct perf_event *event, int flags);
232 * Updates the counter value of the event.
234 void (*read) (struct perf_event *event);
237 * Group events scheduling is treated as a transaction, add
238 * group events as a whole and perform one schedulability test.
239 * If the test fails, roll back the whole group
241 * Start the transaction, after this ->add() doesn't need to
242 * do schedulability tests.
244 void (*start_txn) (struct pmu *pmu); /* optional */
246 * If ->start_txn() disabled the ->add() schedulability test
247 * then ->commit_txn() is required to perform one. On success
248 * the transaction is closed. On error the transaction is kept
249 * open until ->cancel_txn() is called.
251 int (*commit_txn) (struct pmu *pmu); /* optional */
253 * Will cancel the transaction, assumes ->del() is called
254 * for each successful ->add() during the transaction.
256 void (*cancel_txn) (struct pmu *pmu); /* optional */
259 * Will return the value for perf_event_mmap_page::index for this event,
260 * if no implementation is provided it will default to: event->hw.idx + 1.
262 int (*event_idx) (struct perf_event *event); /*optional */
265 * flush branch stack on context-switches (needed in cpu-wide mode)
267 void (*flush_branch_stack) (void);
270 * context-switches callback
272 void (*sched_task) (struct perf_event_context *ctx,
278 * enum perf_event_active_state - the states of a event
280 enum perf_event_active_state {
281 PERF_EVENT_STATE_EXIT = -3,
282 PERF_EVENT_STATE_ERROR = -2,
283 PERF_EVENT_STATE_OFF = -1,
284 PERF_EVENT_STATE_INACTIVE = 0,
285 PERF_EVENT_STATE_ACTIVE = 1,
289 struct perf_sample_data;
291 typedef void (*perf_overflow_handler_t)(struct perf_event *,
292 struct perf_sample_data *,
293 struct pt_regs *regs);
295 enum perf_group_flag {
296 PERF_GROUP_SOFTWARE = 0x1,
299 #define SWEVENT_HLIST_BITS 8
300 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
302 struct swevent_hlist {
303 struct hlist_head heads[SWEVENT_HLIST_SIZE];
304 struct rcu_head rcu_head;
307 #define PERF_ATTACH_CONTEXT 0x01
308 #define PERF_ATTACH_GROUP 0x02
309 #define PERF_ATTACH_TASK 0x04
315 * struct perf_event - performance event kernel representation:
318 #ifdef CONFIG_PERF_EVENTS
320 * entry onto perf_event_context::event_list;
321 * modifications require ctx->lock
322 * RCU safe iterations.
324 struct list_head event_entry;
327 * XXX: group_entry and sibling_list should be mutually exclusive;
328 * either you're a sibling on a group, or you're the group leader.
329 * Rework the code to always use the same list element.
331 * Locked for modification by both ctx->mutex and ctx->lock; holding
332 * either sufficies for read.
334 struct list_head group_entry;
335 struct list_head sibling_list;
338 * We need storage to track the entries in perf_pmu_migrate_context; we
339 * cannot use the event_entry because of RCU and we want to keep the
340 * group in tact which avoids us using the other two entries.
342 struct list_head migrate_entry;
344 struct hlist_node hlist_entry;
345 struct list_head active_entry;
348 struct perf_event *group_leader;
351 enum perf_event_active_state state;
352 unsigned int attach_state;
354 atomic64_t child_count;
357 * These are the total time in nanoseconds that the event
358 * has been enabled (i.e. eligible to run, and the task has
359 * been scheduled in, if this is a per-task event)
360 * and running (scheduled onto the CPU), respectively.
362 * They are computed from tstamp_enabled, tstamp_running and
363 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
365 u64 total_time_enabled;
366 u64 total_time_running;
369 * These are timestamps used for computing total_time_enabled
370 * and total_time_running when the event is in INACTIVE or
371 * ACTIVE state, measured in nanoseconds from an arbitrary point
373 * tstamp_enabled: the notional time when the event was enabled
374 * tstamp_running: the notional time when the event was scheduled on
375 * tstamp_stopped: in INACTIVE state, the notional time when the
376 * event was scheduled off.
383 * timestamp shadows the actual context timing but it can
384 * be safely used in NMI interrupt context. It reflects the
385 * context time as it was when the event was last scheduled in.
387 * ctx_time already accounts for ctx->timestamp. Therefore to
388 * compute ctx_time for a sample, simply add perf_clock().
392 struct perf_event_attr attr;
396 struct hw_perf_event hw;
398 struct perf_event_context *ctx;
399 atomic_long_t refcount;
402 * These accumulate total time (in nanoseconds) that children
403 * events have been enabled and running, respectively.
405 atomic64_t child_total_time_enabled;
406 atomic64_t child_total_time_running;
409 * Protect attach/detach and child_list:
411 struct mutex child_mutex;
412 struct list_head child_list;
413 struct perf_event *parent;
418 struct list_head owner_entry;
419 struct task_struct *owner;
422 struct mutex mmap_mutex;
425 struct ring_buffer *rb;
426 struct list_head rb_entry;
427 unsigned long rcu_batches;
431 wait_queue_head_t waitq;
432 struct fasync_struct *fasync;
434 /* delayed work for NMIs and such */
438 struct irq_work pending;
440 atomic_t event_limit;
442 void (*destroy)(struct perf_event *);
443 struct rcu_head rcu_head;
445 struct pid_namespace *ns;
448 perf_overflow_handler_t overflow_handler;
449 void *overflow_handler_context;
451 #ifdef CONFIG_EVENT_TRACING
452 struct ftrace_event_call *tp_event;
453 struct event_filter *filter;
454 #ifdef CONFIG_FUNCTION_TRACER
455 struct ftrace_ops ftrace_ops;
459 #ifdef CONFIG_CGROUP_PERF
460 struct perf_cgroup *cgrp; /* cgroup event is attach to */
461 int cgrp_defer_enabled;
464 #endif /* CONFIG_PERF_EVENTS */
468 * struct perf_event_context - event context structure
470 * Used as a container for task events and CPU events as well:
472 struct perf_event_context {
475 * Protect the states of the events in the list,
476 * nr_active, and the list:
480 * Protect the list of events. Locking either mutex or lock
481 * is sufficient to ensure the list doesn't change; to change
482 * the list you need to lock both the mutex and the spinlock.
486 struct list_head active_ctx_list;
487 struct list_head pinned_groups;
488 struct list_head flexible_groups;
489 struct list_head event_list;
497 struct task_struct *task;
500 * Context clock, runs when context enabled.
506 * These fields let us detect when two contexts have both
507 * been cloned (inherited) from a common ancestor.
509 struct perf_event_context *parent_ctx;
513 int nr_cgroups; /* cgroup evts */
514 int nr_branch_stack; /* branch_stack evt */
515 struct rcu_head rcu_head;
517 struct delayed_work orphans_remove;
518 bool orphans_remove_sched;
522 * Number of contexts where an event can trigger:
523 * task, softirq, hardirq, nmi.
525 #define PERF_NR_CONTEXTS 4
528 * struct perf_event_cpu_context - per cpu event context structure
530 struct perf_cpu_context {
531 struct perf_event_context ctx;
532 struct perf_event_context *task_ctx;
535 struct hrtimer hrtimer;
536 ktime_t hrtimer_interval;
537 struct pmu *unique_pmu;
538 struct perf_cgroup *cgrp;
541 struct perf_output_handle {
542 struct perf_event *event;
543 struct ring_buffer *rb;
544 unsigned long wakeup;
550 #ifdef CONFIG_PERF_EVENTS
552 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
553 extern void perf_pmu_unregister(struct pmu *pmu);
555 extern int perf_num_counters(void);
556 extern const char *perf_pmu_name(void);
557 extern void __perf_event_task_sched_in(struct task_struct *prev,
558 struct task_struct *task);
559 extern void __perf_event_task_sched_out(struct task_struct *prev,
560 struct task_struct *next);
561 extern int perf_event_init_task(struct task_struct *child);
562 extern void perf_event_exit_task(struct task_struct *child);
563 extern void perf_event_free_task(struct task_struct *task);
564 extern void perf_event_delayed_put(struct task_struct *task);
565 extern void perf_event_print_debug(void);
566 extern void perf_pmu_disable(struct pmu *pmu);
567 extern void perf_pmu_enable(struct pmu *pmu);
568 extern void perf_sched_cb_dec(struct pmu *pmu);
569 extern void perf_sched_cb_inc(struct pmu *pmu);
570 extern int perf_event_task_disable(void);
571 extern int perf_event_task_enable(void);
572 extern int perf_event_refresh(struct perf_event *event, int refresh);
573 extern void perf_event_update_userpage(struct perf_event *event);
574 extern int perf_event_release_kernel(struct perf_event *event);
575 extern struct perf_event *
576 perf_event_create_kernel_counter(struct perf_event_attr *attr,
578 struct task_struct *task,
579 perf_overflow_handler_t callback,
581 extern void perf_pmu_migrate_context(struct pmu *pmu,
582 int src_cpu, int dst_cpu);
583 extern u64 perf_event_read_value(struct perf_event *event,
584 u64 *enabled, u64 *running);
587 struct perf_sample_data {
589 * Fields set by perf_sample_data_init(), group so as to
590 * minimize the cachelines touched.
593 struct perf_raw_record *raw;
594 struct perf_branch_stack *br_stack;
598 union perf_mem_data_src data_src;
601 * The other fields, optionally {set,used} by
602 * perf_{prepare,output}_sample().
617 struct perf_callchain_entry *callchain;
620 * regs_user may point to task_pt_regs or to regs_user_copy, depending
623 struct perf_regs regs_user;
624 struct pt_regs regs_user_copy;
626 struct perf_regs regs_intr;
628 } ____cacheline_aligned;
630 /* default value for data source */
631 #define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\
632 PERF_MEM_S(LVL, NA) |\
633 PERF_MEM_S(SNOOP, NA) |\
634 PERF_MEM_S(LOCK, NA) |\
637 static inline void perf_sample_data_init(struct perf_sample_data *data,
638 u64 addr, u64 period)
640 /* remaining struct members initialized in perf_prepare_sample() */
643 data->br_stack = NULL;
644 data->period = period;
646 data->data_src.val = PERF_MEM_NA;
650 extern void perf_output_sample(struct perf_output_handle *handle,
651 struct perf_event_header *header,
652 struct perf_sample_data *data,
653 struct perf_event *event);
654 extern void perf_prepare_sample(struct perf_event_header *header,
655 struct perf_sample_data *data,
656 struct perf_event *event,
657 struct pt_regs *regs);
659 extern int perf_event_overflow(struct perf_event *event,
660 struct perf_sample_data *data,
661 struct pt_regs *regs);
663 static inline bool is_sampling_event(struct perf_event *event)
665 return event->attr.sample_period != 0;
669 * Return 1 for a software event, 0 for a hardware event
671 static inline int is_software_event(struct perf_event *event)
673 return event->pmu->task_ctx_nr == perf_sw_context;
676 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
678 extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64);
679 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
681 #ifndef perf_arch_fetch_caller_regs
682 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
686 * Take a snapshot of the regs. Skip ip and frame pointer to
687 * the nth caller. We only need a few of the regs:
688 * - ip for PERF_SAMPLE_IP
689 * - cs for user_mode() tests
690 * - bp for callchains
691 * - eflags, for future purposes, just in case
693 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
695 memset(regs, 0, sizeof(*regs));
697 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
700 static __always_inline void
701 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
703 if (static_key_false(&perf_swevent_enabled[event_id]))
704 __perf_sw_event(event_id, nr, regs, addr);
707 DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]);
710 * 'Special' version for the scheduler, it hard assumes no recursion,
711 * which is guaranteed by us not actually scheduling inside other swevents
712 * because those disable preemption.
714 static __always_inline void
715 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)
717 if (static_key_false(&perf_swevent_enabled[event_id])) {
718 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
720 perf_fetch_caller_regs(regs);
721 ___perf_sw_event(event_id, nr, regs, addr);
725 extern struct static_key_deferred perf_sched_events;
727 static inline void perf_event_task_sched_in(struct task_struct *prev,
728 struct task_struct *task)
730 if (static_key_false(&perf_sched_events.key))
731 __perf_event_task_sched_in(prev, task);
734 static inline void perf_event_task_sched_out(struct task_struct *prev,
735 struct task_struct *next)
737 perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);
739 if (static_key_false(&perf_sched_events.key))
740 __perf_event_task_sched_out(prev, next);
743 extern void perf_event_mmap(struct vm_area_struct *vma);
744 extern struct perf_guest_info_callbacks *perf_guest_cbs;
745 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
746 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
748 extern void perf_event_exec(void);
749 extern void perf_event_comm(struct task_struct *tsk, bool exec);
750 extern void perf_event_fork(struct task_struct *tsk);
753 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
755 extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
756 extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
758 static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
760 if (entry->nr < PERF_MAX_STACK_DEPTH)
761 entry->ip[entry->nr++] = ip;
764 extern int sysctl_perf_event_paranoid;
765 extern int sysctl_perf_event_mlock;
766 extern int sysctl_perf_event_sample_rate;
767 extern int sysctl_perf_cpu_time_max_percent;
769 extern void perf_sample_event_took(u64 sample_len_ns);
771 extern int perf_proc_update_handler(struct ctl_table *table, int write,
772 void __user *buffer, size_t *lenp,
774 extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
775 void __user *buffer, size_t *lenp,
779 static inline bool perf_paranoid_tracepoint_raw(void)
781 return sysctl_perf_event_paranoid > -1;
784 static inline bool perf_paranoid_cpu(void)
786 return sysctl_perf_event_paranoid > 0;
789 static inline bool perf_paranoid_kernel(void)
791 return sysctl_perf_event_paranoid > 1;
794 extern void perf_event_init(void);
795 extern void perf_tp_event(u64 addr, u64 count, void *record,
796 int entry_size, struct pt_regs *regs,
797 struct hlist_head *head, int rctx,
798 struct task_struct *task);
799 extern void perf_bp_event(struct perf_event *event, void *data);
801 #ifndef perf_misc_flags
802 # define perf_misc_flags(regs) \
803 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
804 # define perf_instruction_pointer(regs) instruction_pointer(regs)
807 static inline bool has_branch_stack(struct perf_event *event)
809 return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
812 extern int perf_output_begin(struct perf_output_handle *handle,
813 struct perf_event *event, unsigned int size);
814 extern void perf_output_end(struct perf_output_handle *handle);
815 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
816 const void *buf, unsigned int len);
817 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
819 extern int perf_swevent_get_recursion_context(void);
820 extern void perf_swevent_put_recursion_context(int rctx);
821 extern u64 perf_swevent_set_period(struct perf_event *event);
822 extern void perf_event_enable(struct perf_event *event);
823 extern void perf_event_disable(struct perf_event *event);
824 extern int __perf_event_disable(void *info);
825 extern void perf_event_task_tick(void);
826 #else /* !CONFIG_PERF_EVENTS: */
828 perf_event_task_sched_in(struct task_struct *prev,
829 struct task_struct *task) { }
831 perf_event_task_sched_out(struct task_struct *prev,
832 struct task_struct *next) { }
833 static inline int perf_event_init_task(struct task_struct *child) { return 0; }
834 static inline void perf_event_exit_task(struct task_struct *child) { }
835 static inline void perf_event_free_task(struct task_struct *task) { }
836 static inline void perf_event_delayed_put(struct task_struct *task) { }
837 static inline void perf_event_print_debug(void) { }
838 static inline int perf_event_task_disable(void) { return -EINVAL; }
839 static inline int perf_event_task_enable(void) { return -EINVAL; }
840 static inline int perf_event_refresh(struct perf_event *event, int refresh)
846 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
848 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) { }
850 perf_bp_event(struct perf_event *event, void *data) { }
852 static inline int perf_register_guest_info_callbacks
853 (struct perf_guest_info_callbacks *callbacks) { return 0; }
854 static inline int perf_unregister_guest_info_callbacks
855 (struct perf_guest_info_callbacks *callbacks) { return 0; }
857 static inline void perf_event_mmap(struct vm_area_struct *vma) { }
858 static inline void perf_event_exec(void) { }
859 static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
860 static inline void perf_event_fork(struct task_struct *tsk) { }
861 static inline void perf_event_init(void) { }
862 static inline int perf_swevent_get_recursion_context(void) { return -1; }
863 static inline void perf_swevent_put_recursion_context(int rctx) { }
864 static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; }
865 static inline void perf_event_enable(struct perf_event *event) { }
866 static inline void perf_event_disable(struct perf_event *event) { }
867 static inline int __perf_event_disable(void *info) { return -1; }
868 static inline void perf_event_task_tick(void) { }
871 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
872 extern bool perf_event_can_stop_tick(void);
874 static inline bool perf_event_can_stop_tick(void) { return true; }
877 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
878 extern void perf_restore_debug_store(void);
880 static inline void perf_restore_debug_store(void) { }
883 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
886 * This has to have a higher priority than migration_notifier in sched/core.c.
888 #define perf_cpu_notifier(fn) \
890 static struct notifier_block fn##_nb = \
891 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
892 unsigned long cpu = smp_processor_id(); \
893 unsigned long flags; \
895 cpu_notifier_register_begin(); \
896 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
897 (void *)(unsigned long)cpu); \
898 local_irq_save(flags); \
899 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
900 (void *)(unsigned long)cpu); \
901 local_irq_restore(flags); \
902 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
903 (void *)(unsigned long)cpu); \
904 __register_cpu_notifier(&fn##_nb); \
905 cpu_notifier_register_done(); \
909 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
910 * callback for already online CPUs.
912 #define __perf_cpu_notifier(fn) \
914 static struct notifier_block fn##_nb = \
915 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
917 __register_cpu_notifier(&fn##_nb); \
920 struct perf_pmu_events_attr {
921 struct device_attribute attr;
923 const char *event_str;
926 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
927 static struct perf_pmu_events_attr _var = { \
928 .attr = __ATTR(_name, 0444, _show, NULL), \
932 #define PMU_FORMAT_ATTR(_name, _format) \
934 _name##_show(struct device *dev, \
935 struct device_attribute *attr, \
938 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
939 return sprintf(page, _format "\n"); \
942 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
944 #endif /* _LINUX_PERF_EVENT_H */