4 * Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
5 * Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
6 * Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
8 * Data type definitions, declarations, prototypes.
10 * Started by: Thomas Gleixner and Ingo Molnar
12 * For licencing details see kernel-base/COPYING
14 #ifndef _LINUX_PERF_EVENT_H
15 #define _LINUX_PERF_EVENT_H
17 #include <uapi/linux/perf_event.h>
20 * Kernel-internal data types and definitions:
23 #ifdef CONFIG_PERF_EVENTS
24 # include <asm/perf_event.h>
25 # include <asm/local64.h>
28 struct perf_guest_info_callbacks {
29 int (*is_in_guest)(void);
30 int (*is_user_mode)(void);
31 unsigned long (*get_guest_ip)(void);
34 #ifdef CONFIG_HAVE_HW_BREAKPOINT
35 #include <asm/hw_breakpoint.h>
38 #include <linux/list.h>
39 #include <linux/mutex.h>
40 #include <linux/rculist.h>
41 #include <linux/rcupdate.h>
42 #include <linux/spinlock.h>
43 #include <linux/hrtimer.h>
45 #include <linux/pid_namespace.h>
46 #include <linux/workqueue.h>
47 #include <linux/ftrace.h>
48 #include <linux/cpu.h>
49 #include <linux/irq_work.h>
50 #include <linux/static_key.h>
51 #include <linux/jump_label_ratelimit.h>
52 #include <linux/atomic.h>
53 #include <linux/sysfs.h>
54 #include <linux/perf_regs.h>
55 #include <linux/workqueue.h>
56 #include <asm/local.h>
58 struct perf_callchain_entry {
60 __u64 ip[PERF_MAX_STACK_DEPTH];
63 struct perf_raw_record {
69 * branch stack layout:
70 * nr: number of taken branches stored in entries[]
72 * Note that nr can vary from sample to sample
73 * branches (to, from) are stored from most recent
74 * to least recent, i.e., entries[0] contains the most
77 struct perf_branch_stack {
79 struct perf_branch_entry entries[0];
85 * extra PMU register associated with an event
87 struct hw_perf_event_extra {
88 u64 config; /* register value */
89 unsigned int reg; /* register address or index */
90 int alloc; /* extra register already allocated */
91 int idx; /* index in shared_regs->regs[] */
94 struct event_constraint;
97 * struct hw_perf_event - performance event hardware details:
99 struct hw_perf_event {
100 #ifdef CONFIG_PERF_EVENTS
102 struct { /* hardware */
105 unsigned long config_base;
106 unsigned long event_base;
107 int event_base_rdpmc;
112 struct hw_perf_event_extra extra_reg;
113 struct hw_perf_event_extra branch_reg;
115 struct event_constraint *constraint;
117 struct { /* software */
118 struct hrtimer hrtimer;
120 struct { /* tracepoint */
121 struct task_struct *tp_target;
122 /* for tp_event->class */
123 struct list_head tp_list;
125 #ifdef CONFIG_HAVE_HW_BREAKPOINT
126 struct { /* breakpoint */
128 * Crufty hack to avoid the chicken and egg
129 * problem hw_breakpoint has with context
130 * creation and event initalization.
132 struct task_struct *bp_target;
133 struct arch_hw_breakpoint info;
134 struct list_head bp_list;
139 local64_t prev_count;
142 local64_t period_left;
147 u64 freq_count_stamp;
152 * hw_perf_event::state flags
154 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
155 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
156 #define PERF_HES_ARCH 0x04
161 * Common implementation detail of pmu::{start,commit,cancel}_txn
163 #define PERF_EVENT_TXN 0x1
166 * pmu::capabilities flags
168 #define PERF_PMU_CAP_NO_INTERRUPT 0x01
171 * struct pmu - generic performance monitoring unit
174 struct list_head entry;
176 struct module *module;
178 const struct attribute_group **attr_groups;
183 * various common per-pmu feature flags
187 int * __percpu pmu_disable_count;
188 struct perf_cpu_context * __percpu pmu_cpu_context;
190 int hrtimer_interval_ms;
193 * Fully disable/enable this PMU, can be used to protect from the PMI
194 * as well as for lazy/batch writing of the MSRs.
196 void (*pmu_enable) (struct pmu *pmu); /* optional */
197 void (*pmu_disable) (struct pmu *pmu); /* optional */
200 * Try and initialize the event for this PMU.
201 * Should return -ENOENT when the @event doesn't match this PMU.
203 int (*event_init) (struct perf_event *event);
205 #define PERF_EF_START 0x01 /* start the counter when adding */
206 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
207 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
210 * Adds/Removes a counter to/from the PMU, can be done inside
211 * a transaction, see the ->*_txn() methods.
213 int (*add) (struct perf_event *event, int flags);
214 void (*del) (struct perf_event *event, int flags);
217 * Starts/Stops a counter present on the PMU. The PMI handler
218 * should stop the counter when perf_event_overflow() returns
219 * !0. ->start() will be used to continue.
221 void (*start) (struct perf_event *event, int flags);
222 void (*stop) (struct perf_event *event, int flags);
225 * Updates the counter value of the event.
227 void (*read) (struct perf_event *event);
230 * Group events scheduling is treated as a transaction, add
231 * group events as a whole and perform one schedulability test.
232 * If the test fails, roll back the whole group
234 * Start the transaction, after this ->add() doesn't need to
235 * do schedulability tests.
237 void (*start_txn) (struct pmu *pmu); /* optional */
239 * If ->start_txn() disabled the ->add() schedulability test
240 * then ->commit_txn() is required to perform one. On success
241 * the transaction is closed. On error the transaction is kept
242 * open until ->cancel_txn() is called.
244 int (*commit_txn) (struct pmu *pmu); /* optional */
246 * Will cancel the transaction, assumes ->del() is called
247 * for each successful ->add() during the transaction.
249 void (*cancel_txn) (struct pmu *pmu); /* optional */
252 * Will return the value for perf_event_mmap_page::index for this event,
253 * if no implementation is provided it will default to: event->hw.idx + 1.
255 int (*event_idx) (struct perf_event *event); /*optional */
258 * flush branch stack on context-switches (needed in cpu-wide mode)
260 void (*flush_branch_stack) (void);
264 * enum perf_event_active_state - the states of a event
266 enum perf_event_active_state {
267 PERF_EVENT_STATE_EXIT = -3,
268 PERF_EVENT_STATE_ERROR = -2,
269 PERF_EVENT_STATE_OFF = -1,
270 PERF_EVENT_STATE_INACTIVE = 0,
271 PERF_EVENT_STATE_ACTIVE = 1,
275 struct perf_sample_data;
277 typedef void (*perf_overflow_handler_t)(struct perf_event *,
278 struct perf_sample_data *,
279 struct pt_regs *regs);
281 enum perf_group_flag {
282 PERF_GROUP_SOFTWARE = 0x1,
285 #define SWEVENT_HLIST_BITS 8
286 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
288 struct swevent_hlist {
289 struct hlist_head heads[SWEVENT_HLIST_SIZE];
290 struct rcu_head rcu_head;
293 #define PERF_ATTACH_CONTEXT 0x01
294 #define PERF_ATTACH_GROUP 0x02
295 #define PERF_ATTACH_TASK 0x04
301 * struct perf_event - performance event kernel representation:
304 #ifdef CONFIG_PERF_EVENTS
306 * entry onto perf_event_context::event_list;
307 * modifications require ctx->lock
308 * RCU safe iterations.
310 struct list_head event_entry;
313 * XXX: group_entry and sibling_list should be mutually exclusive;
314 * either you're a sibling on a group, or you're the group leader.
315 * Rework the code to always use the same list element.
317 * Locked for modification by both ctx->mutex and ctx->lock; holding
318 * either sufficies for read.
320 struct list_head group_entry;
321 struct list_head sibling_list;
324 * We need storage to track the entries in perf_pmu_migrate_context; we
325 * cannot use the event_entry because of RCU and we want to keep the
326 * group in tact which avoids us using the other two entries.
328 struct list_head migrate_entry;
330 struct hlist_node hlist_entry;
331 struct list_head active_entry;
334 struct perf_event *group_leader;
337 enum perf_event_active_state state;
338 unsigned int attach_state;
340 atomic64_t child_count;
343 * These are the total time in nanoseconds that the event
344 * has been enabled (i.e. eligible to run, and the task has
345 * been scheduled in, if this is a per-task event)
346 * and running (scheduled onto the CPU), respectively.
348 * They are computed from tstamp_enabled, tstamp_running and
349 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
351 u64 total_time_enabled;
352 u64 total_time_running;
355 * These are timestamps used for computing total_time_enabled
356 * and total_time_running when the event is in INACTIVE or
357 * ACTIVE state, measured in nanoseconds from an arbitrary point
359 * tstamp_enabled: the notional time when the event was enabled
360 * tstamp_running: the notional time when the event was scheduled on
361 * tstamp_stopped: in INACTIVE state, the notional time when the
362 * event was scheduled off.
369 * timestamp shadows the actual context timing but it can
370 * be safely used in NMI interrupt context. It reflects the
371 * context time as it was when the event was last scheduled in.
373 * ctx_time already accounts for ctx->timestamp. Therefore to
374 * compute ctx_time for a sample, simply add perf_clock().
378 struct perf_event_attr attr;
382 struct hw_perf_event hw;
384 struct perf_event_context *ctx;
385 atomic_long_t refcount;
388 * These accumulate total time (in nanoseconds) that children
389 * events have been enabled and running, respectively.
391 atomic64_t child_total_time_enabled;
392 atomic64_t child_total_time_running;
395 * Protect attach/detach and child_list:
397 struct mutex child_mutex;
398 struct list_head child_list;
399 struct perf_event *parent;
404 struct list_head owner_entry;
405 struct task_struct *owner;
408 struct mutex mmap_mutex;
411 struct ring_buffer *rb;
412 struct list_head rb_entry;
413 unsigned long rcu_batches;
417 wait_queue_head_t waitq;
418 struct fasync_struct *fasync;
420 /* delayed work for NMIs and such */
424 struct irq_work pending;
426 atomic_t event_limit;
428 void (*destroy)(struct perf_event *);
429 struct rcu_head rcu_head;
431 struct pid_namespace *ns;
434 perf_overflow_handler_t overflow_handler;
435 void *overflow_handler_context;
437 #ifdef CONFIG_EVENT_TRACING
438 struct ftrace_event_call *tp_event;
439 struct event_filter *filter;
440 #ifdef CONFIG_FUNCTION_TRACER
441 struct ftrace_ops ftrace_ops;
445 #ifdef CONFIG_CGROUP_PERF
446 struct perf_cgroup *cgrp; /* cgroup event is attach to */
447 int cgrp_defer_enabled;
450 #endif /* CONFIG_PERF_EVENTS */
454 * struct perf_event_context - event context structure
456 * Used as a container for task events and CPU events as well:
458 struct perf_event_context {
461 * Protect the states of the events in the list,
462 * nr_active, and the list:
466 * Protect the list of events. Locking either mutex or lock
467 * is sufficient to ensure the list doesn't change; to change
468 * the list you need to lock both the mutex and the spinlock.
472 struct list_head active_ctx_list;
473 struct list_head pinned_groups;
474 struct list_head flexible_groups;
475 struct list_head event_list;
483 struct task_struct *task;
486 * Context clock, runs when context enabled.
492 * These fields let us detect when two contexts have both
493 * been cloned (inherited) from a common ancestor.
495 struct perf_event_context *parent_ctx;
499 int nr_cgroups; /* cgroup evts */
500 int nr_branch_stack; /* branch_stack evt */
501 struct rcu_head rcu_head;
503 struct delayed_work orphans_remove;
504 bool orphans_remove_sched;
508 * Number of contexts where an event can trigger:
509 * task, softirq, hardirq, nmi.
511 #define PERF_NR_CONTEXTS 4
514 * struct perf_event_cpu_context - per cpu event context structure
516 struct perf_cpu_context {
517 struct perf_event_context ctx;
518 struct perf_event_context *task_ctx;
521 struct hrtimer hrtimer;
522 ktime_t hrtimer_interval;
523 struct pmu *unique_pmu;
524 struct perf_cgroup *cgrp;
527 struct perf_output_handle {
528 struct perf_event *event;
529 struct ring_buffer *rb;
530 unsigned long wakeup;
536 #ifdef CONFIG_PERF_EVENTS
538 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
539 extern void perf_pmu_unregister(struct pmu *pmu);
541 extern int perf_num_counters(void);
542 extern const char *perf_pmu_name(void);
543 extern void __perf_event_task_sched_in(struct task_struct *prev,
544 struct task_struct *task);
545 extern void __perf_event_task_sched_out(struct task_struct *prev,
546 struct task_struct *next);
547 extern int perf_event_init_task(struct task_struct *child);
548 extern void perf_event_exit_task(struct task_struct *child);
549 extern void perf_event_free_task(struct task_struct *task);
550 extern void perf_event_delayed_put(struct task_struct *task);
551 extern void perf_event_print_debug(void);
552 extern void perf_pmu_disable(struct pmu *pmu);
553 extern void perf_pmu_enable(struct pmu *pmu);
554 extern int perf_event_task_disable(void);
555 extern int perf_event_task_enable(void);
556 extern int perf_event_refresh(struct perf_event *event, int refresh);
557 extern void perf_event_update_userpage(struct perf_event *event);
558 extern int perf_event_release_kernel(struct perf_event *event);
559 extern struct perf_event *
560 perf_event_create_kernel_counter(struct perf_event_attr *attr,
562 struct task_struct *task,
563 perf_overflow_handler_t callback,
565 extern void perf_pmu_migrate_context(struct pmu *pmu,
566 int src_cpu, int dst_cpu);
567 extern u64 perf_event_read_value(struct perf_event *event,
568 u64 *enabled, u64 *running);
571 struct perf_sample_data {
573 * Fields set by perf_sample_data_init(), group so as to
574 * minimize the cachelines touched.
577 struct perf_raw_record *raw;
578 struct perf_branch_stack *br_stack;
582 union perf_mem_data_src data_src;
585 * The other fields, optionally {set,used} by
586 * perf_{prepare,output}_sample().
601 struct perf_callchain_entry *callchain;
604 * regs_user may point to task_pt_regs or to regs_user_copy, depending
607 struct perf_regs regs_user;
608 struct pt_regs regs_user_copy;
610 struct perf_regs regs_intr;
612 } ____cacheline_aligned;
614 /* default value for data source */
615 #define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\
616 PERF_MEM_S(LVL, NA) |\
617 PERF_MEM_S(SNOOP, NA) |\
618 PERF_MEM_S(LOCK, NA) |\
621 static inline void perf_sample_data_init(struct perf_sample_data *data,
622 u64 addr, u64 period)
624 /* remaining struct members initialized in perf_prepare_sample() */
627 data->br_stack = NULL;
628 data->period = period;
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);
663 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
665 #ifndef perf_arch_fetch_caller_regs
666 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
670 * Take a snapshot of the regs. Skip ip and frame pointer to
671 * the nth caller. We only need a few of the regs:
672 * - ip for PERF_SAMPLE_IP
673 * - cs for user_mode() tests
674 * - bp for callchains
675 * - eflags, for future purposes, just in case
677 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
679 memset(regs, 0, sizeof(*regs));
681 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
684 static __always_inline void
685 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
687 if (static_key_false(&perf_swevent_enabled[event_id]))
688 __perf_sw_event(event_id, nr, regs, addr);
691 DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]);
694 * 'Special' version for the scheduler, it hard assumes no recursion,
695 * which is guaranteed by us not actually scheduling inside other swevents
696 * because those disable preemption.
698 static __always_inline void
699 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)
701 if (static_key_false(&perf_swevent_enabled[event_id])) {
702 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
704 perf_fetch_caller_regs(regs);
705 ___perf_sw_event(event_id, nr, regs, addr);
709 extern struct static_key_deferred perf_sched_events;
711 static inline void perf_event_task_sched_in(struct task_struct *prev,
712 struct task_struct *task)
714 if (static_key_false(&perf_sched_events.key))
715 __perf_event_task_sched_in(prev, task);
718 static inline void perf_event_task_sched_out(struct task_struct *prev,
719 struct task_struct *next)
721 perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);
723 if (static_key_false(&perf_sched_events.key))
724 __perf_event_task_sched_out(prev, next);
727 extern void perf_event_mmap(struct vm_area_struct *vma);
728 extern struct perf_guest_info_callbacks *perf_guest_cbs;
729 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
730 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
732 extern void perf_event_exec(void);
733 extern void perf_event_comm(struct task_struct *tsk, bool exec);
734 extern void perf_event_fork(struct task_struct *tsk);
737 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
739 extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
740 extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
742 static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
744 if (entry->nr < PERF_MAX_STACK_DEPTH)
745 entry->ip[entry->nr++] = ip;
748 extern int sysctl_perf_event_paranoid;
749 extern int sysctl_perf_event_mlock;
750 extern int sysctl_perf_event_sample_rate;
751 extern int sysctl_perf_cpu_time_max_percent;
753 extern void perf_sample_event_took(u64 sample_len_ns);
755 extern int perf_proc_update_handler(struct ctl_table *table, int write,
756 void __user *buffer, size_t *lenp,
758 extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
759 void __user *buffer, size_t *lenp,
763 static inline bool perf_paranoid_tracepoint_raw(void)
765 return sysctl_perf_event_paranoid > -1;
768 static inline bool perf_paranoid_cpu(void)
770 return sysctl_perf_event_paranoid > 0;
773 static inline bool perf_paranoid_kernel(void)
775 return sysctl_perf_event_paranoid > 1;
778 extern void perf_event_init(void);
779 extern void perf_tp_event(u64 addr, u64 count, void *record,
780 int entry_size, struct pt_regs *regs,
781 struct hlist_head *head, int rctx,
782 struct task_struct *task);
783 extern void perf_bp_event(struct perf_event *event, void *data);
785 #ifndef perf_misc_flags
786 # define perf_misc_flags(regs) \
787 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
788 # define perf_instruction_pointer(regs) instruction_pointer(regs)
791 static inline bool has_branch_stack(struct perf_event *event)
793 return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
796 extern int perf_output_begin(struct perf_output_handle *handle,
797 struct perf_event *event, unsigned int size);
798 extern void perf_output_end(struct perf_output_handle *handle);
799 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
800 const void *buf, unsigned int len);
801 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
803 extern int perf_swevent_get_recursion_context(void);
804 extern void perf_swevent_put_recursion_context(int rctx);
805 extern u64 perf_swevent_set_period(struct perf_event *event);
806 extern void perf_event_enable(struct perf_event *event);
807 extern void perf_event_disable(struct perf_event *event);
808 extern int __perf_event_disable(void *info);
809 extern void perf_event_task_tick(void);
810 #else /* !CONFIG_PERF_EVENTS: */
812 perf_event_task_sched_in(struct task_struct *prev,
813 struct task_struct *task) { }
815 perf_event_task_sched_out(struct task_struct *prev,
816 struct task_struct *next) { }
817 static inline int perf_event_init_task(struct task_struct *child) { return 0; }
818 static inline void perf_event_exit_task(struct task_struct *child) { }
819 static inline void perf_event_free_task(struct task_struct *task) { }
820 static inline void perf_event_delayed_put(struct task_struct *task) { }
821 static inline void perf_event_print_debug(void) { }
822 static inline int perf_event_task_disable(void) { return -EINVAL; }
823 static inline int perf_event_task_enable(void) { return -EINVAL; }
824 static inline int perf_event_refresh(struct perf_event *event, int refresh)
830 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
832 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) { }
834 perf_bp_event(struct perf_event *event, void *data) { }
836 static inline int perf_register_guest_info_callbacks
837 (struct perf_guest_info_callbacks *callbacks) { return 0; }
838 static inline int perf_unregister_guest_info_callbacks
839 (struct perf_guest_info_callbacks *callbacks) { return 0; }
841 static inline void perf_event_mmap(struct vm_area_struct *vma) { }
842 static inline void perf_event_exec(void) { }
843 static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
844 static inline void perf_event_fork(struct task_struct *tsk) { }
845 static inline void perf_event_init(void) { }
846 static inline int perf_swevent_get_recursion_context(void) { return -1; }
847 static inline void perf_swevent_put_recursion_context(int rctx) { }
848 static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; }
849 static inline void perf_event_enable(struct perf_event *event) { }
850 static inline void perf_event_disable(struct perf_event *event) { }
851 static inline int __perf_event_disable(void *info) { return -1; }
852 static inline void perf_event_task_tick(void) { }
855 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
856 extern bool perf_event_can_stop_tick(void);
858 static inline bool perf_event_can_stop_tick(void) { return true; }
861 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
862 extern void perf_restore_debug_store(void);
864 static inline void perf_restore_debug_store(void) { }
867 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
870 * This has to have a higher priority than migration_notifier in sched/core.c.
872 #define perf_cpu_notifier(fn) \
874 static struct notifier_block fn##_nb = \
875 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
876 unsigned long cpu = smp_processor_id(); \
877 unsigned long flags; \
879 cpu_notifier_register_begin(); \
880 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
881 (void *)(unsigned long)cpu); \
882 local_irq_save(flags); \
883 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
884 (void *)(unsigned long)cpu); \
885 local_irq_restore(flags); \
886 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
887 (void *)(unsigned long)cpu); \
888 __register_cpu_notifier(&fn##_nb); \
889 cpu_notifier_register_done(); \
893 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
894 * callback for already online CPUs.
896 #define __perf_cpu_notifier(fn) \
898 static struct notifier_block fn##_nb = \
899 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
901 __register_cpu_notifier(&fn##_nb); \
904 struct perf_pmu_events_attr {
905 struct device_attribute attr;
907 const char *event_str;
910 ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
913 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
914 static struct perf_pmu_events_attr _var = { \
915 .attr = __ATTR(_name, 0444, _show, NULL), \
919 #define PMU_EVENT_ATTR_STRING(_name, _var, _str) \
920 static struct perf_pmu_events_attr _var = { \
921 .attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \
926 #define PMU_FORMAT_ATTR(_name, _format) \
928 _name##_show(struct device *dev, \
929 struct device_attribute *attr, \
932 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
933 return sprintf(page, _format "\n"); \
936 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
938 #endif /* _LINUX_PERF_EVENT_H */