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 <linux/cgroup.h>
57 #include <asm/local.h>
59 struct perf_callchain_entry {
61 __u64 ip[PERF_MAX_STACK_DEPTH];
64 struct perf_raw_record {
70 * branch stack layout:
71 * nr: number of taken branches stored in entries[]
73 * Note that nr can vary from sample to sample
74 * branches (to, from) are stored from most recent
75 * to least recent, i.e., entries[0] contains the most
78 struct perf_branch_stack {
80 struct perf_branch_entry entries[0];
86 * extra PMU register associated with an event
88 struct hw_perf_event_extra {
89 u64 config; /* register value */
90 unsigned int reg; /* register address or index */
91 int alloc; /* extra register already allocated */
92 int idx; /* index in shared_regs->regs[] */
95 struct event_constraint;
98 * struct hw_perf_event - performance event hardware details:
100 struct hw_perf_event {
101 #ifdef CONFIG_PERF_EVENTS
103 struct { /* hardware */
106 unsigned long config_base;
107 unsigned long event_base;
108 int event_base_rdpmc;
113 struct hw_perf_event_extra extra_reg;
114 struct hw_perf_event_extra branch_reg;
116 struct event_constraint *constraint;
118 struct { /* software */
119 struct hrtimer hrtimer;
121 struct { /* tracepoint */
122 /* for tp_event->class */
123 struct list_head tp_list;
125 struct { /* intel_cqm */
128 struct list_head cqm_events_entry;
129 struct list_head cqm_groups_entry;
130 struct list_head cqm_group_entry;
132 #ifdef CONFIG_HAVE_HW_BREAKPOINT
133 struct { /* breakpoint */
135 * Crufty hack to avoid the chicken and egg
136 * problem hw_breakpoint has with context
137 * creation and event initalization.
139 struct arch_hw_breakpoint info;
140 struct list_head bp_list;
144 struct task_struct *target;
146 local64_t prev_count;
149 local64_t period_left;
154 u64 freq_count_stamp;
159 * hw_perf_event::state flags
161 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
162 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
163 #define PERF_HES_ARCH 0x04
168 * Common implementation detail of pmu::{start,commit,cancel}_txn
170 #define PERF_EVENT_TXN 0x1
173 * pmu::capabilities flags
175 #define PERF_PMU_CAP_NO_INTERRUPT 0x01
178 * struct pmu - generic performance monitoring unit
181 struct list_head entry;
183 struct module *module;
185 const struct attribute_group **attr_groups;
190 * various common per-pmu feature flags
194 int * __percpu pmu_disable_count;
195 struct perf_cpu_context * __percpu pmu_cpu_context;
197 int hrtimer_interval_ms;
200 * Fully disable/enable this PMU, can be used to protect from the PMI
201 * as well as for lazy/batch writing of the MSRs.
203 void (*pmu_enable) (struct pmu *pmu); /* optional */
204 void (*pmu_disable) (struct pmu *pmu); /* optional */
207 * Try and initialize the event for this PMU.
208 * Should return -ENOENT when the @event doesn't match this PMU.
210 int (*event_init) (struct perf_event *event);
213 * Notification that the event was mapped or unmapped. Called
214 * in the context of the mapping task.
216 void (*event_mapped) (struct perf_event *event); /*optional*/
217 void (*event_unmapped) (struct perf_event *event); /*optional*/
219 #define PERF_EF_START 0x01 /* start the counter when adding */
220 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
221 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
224 * Adds/Removes a counter to/from the PMU, can be done inside
225 * a transaction, see the ->*_txn() methods.
227 int (*add) (struct perf_event *event, int flags);
228 void (*del) (struct perf_event *event, int flags);
231 * Starts/Stops a counter present on the PMU. The PMI handler
232 * should stop the counter when perf_event_overflow() returns
233 * !0. ->start() will be used to continue.
235 void (*start) (struct perf_event *event, int flags);
236 void (*stop) (struct perf_event *event, int flags);
239 * Updates the counter value of the event.
241 void (*read) (struct perf_event *event);
244 * Group events scheduling is treated as a transaction, add
245 * group events as a whole and perform one schedulability test.
246 * If the test fails, roll back the whole group
248 * Start the transaction, after this ->add() doesn't need to
249 * do schedulability tests.
251 void (*start_txn) (struct pmu *pmu); /* optional */
253 * If ->start_txn() disabled the ->add() schedulability test
254 * then ->commit_txn() is required to perform one. On success
255 * the transaction is closed. On error the transaction is kept
256 * open until ->cancel_txn() is called.
258 int (*commit_txn) (struct pmu *pmu); /* optional */
260 * Will cancel the transaction, assumes ->del() is called
261 * for each successful ->add() during the transaction.
263 void (*cancel_txn) (struct pmu *pmu); /* optional */
266 * Will return the value for perf_event_mmap_page::index for this event,
267 * if no implementation is provided it will default to: event->hw.idx + 1.
269 int (*event_idx) (struct perf_event *event); /*optional */
272 * context-switches callback
274 void (*sched_task) (struct perf_event_context *ctx,
277 * PMU specific data size
279 size_t task_ctx_size;
283 * Return the count value for a counter.
285 u64 (*count) (struct perf_event *event); /*optional*/
289 * enum perf_event_active_state - the states of a event
291 enum perf_event_active_state {
292 PERF_EVENT_STATE_EXIT = -3,
293 PERF_EVENT_STATE_ERROR = -2,
294 PERF_EVENT_STATE_OFF = -1,
295 PERF_EVENT_STATE_INACTIVE = 0,
296 PERF_EVENT_STATE_ACTIVE = 1,
300 struct perf_sample_data;
302 typedef void (*perf_overflow_handler_t)(struct perf_event *,
303 struct perf_sample_data *,
304 struct pt_regs *regs);
306 enum perf_group_flag {
307 PERF_GROUP_SOFTWARE = 0x1,
310 #define SWEVENT_HLIST_BITS 8
311 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
313 struct swevent_hlist {
314 struct hlist_head heads[SWEVENT_HLIST_SIZE];
315 struct rcu_head rcu_head;
318 #define PERF_ATTACH_CONTEXT 0x01
319 #define PERF_ATTACH_GROUP 0x02
320 #define PERF_ATTACH_TASK 0x04
321 #define PERF_ATTACH_TASK_DATA 0x08
327 * struct perf_event - performance event kernel representation:
330 #ifdef CONFIG_PERF_EVENTS
332 * entry onto perf_event_context::event_list;
333 * modifications require ctx->lock
334 * RCU safe iterations.
336 struct list_head event_entry;
339 * XXX: group_entry and sibling_list should be mutually exclusive;
340 * either you're a sibling on a group, or you're the group leader.
341 * Rework the code to always use the same list element.
343 * Locked for modification by both ctx->mutex and ctx->lock; holding
344 * either sufficies for read.
346 struct list_head group_entry;
347 struct list_head sibling_list;
350 * We need storage to track the entries in perf_pmu_migrate_context; we
351 * cannot use the event_entry because of RCU and we want to keep the
352 * group in tact which avoids us using the other two entries.
354 struct list_head migrate_entry;
356 struct hlist_node hlist_entry;
357 struct list_head active_entry;
360 struct perf_event *group_leader;
363 enum perf_event_active_state state;
364 unsigned int attach_state;
366 atomic64_t child_count;
369 * These are the total time in nanoseconds that the event
370 * has been enabled (i.e. eligible to run, and the task has
371 * been scheduled in, if this is a per-task event)
372 * and running (scheduled onto the CPU), respectively.
374 * They are computed from tstamp_enabled, tstamp_running and
375 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
377 u64 total_time_enabled;
378 u64 total_time_running;
381 * These are timestamps used for computing total_time_enabled
382 * and total_time_running when the event is in INACTIVE or
383 * ACTIVE state, measured in nanoseconds from an arbitrary point
385 * tstamp_enabled: the notional time when the event was enabled
386 * tstamp_running: the notional time when the event was scheduled on
387 * tstamp_stopped: in INACTIVE state, the notional time when the
388 * event was scheduled off.
395 * timestamp shadows the actual context timing but it can
396 * be safely used in NMI interrupt context. It reflects the
397 * context time as it was when the event was last scheduled in.
399 * ctx_time already accounts for ctx->timestamp. Therefore to
400 * compute ctx_time for a sample, simply add perf_clock().
404 struct perf_event_attr attr;
408 struct hw_perf_event hw;
410 struct perf_event_context *ctx;
411 atomic_long_t refcount;
414 * These accumulate total time (in nanoseconds) that children
415 * events have been enabled and running, respectively.
417 atomic64_t child_total_time_enabled;
418 atomic64_t child_total_time_running;
421 * Protect attach/detach and child_list:
423 struct mutex child_mutex;
424 struct list_head child_list;
425 struct perf_event *parent;
430 struct list_head owner_entry;
431 struct task_struct *owner;
434 struct mutex mmap_mutex;
437 struct ring_buffer *rb;
438 struct list_head rb_entry;
439 unsigned long rcu_batches;
443 wait_queue_head_t waitq;
444 struct fasync_struct *fasync;
446 /* delayed work for NMIs and such */
450 struct irq_work pending;
452 atomic_t event_limit;
454 void (*destroy)(struct perf_event *);
455 struct rcu_head rcu_head;
457 struct pid_namespace *ns;
460 perf_overflow_handler_t overflow_handler;
461 void *overflow_handler_context;
463 #ifdef CONFIG_EVENT_TRACING
464 struct ftrace_event_call *tp_event;
465 struct event_filter *filter;
466 #ifdef CONFIG_FUNCTION_TRACER
467 struct ftrace_ops ftrace_ops;
471 #ifdef CONFIG_CGROUP_PERF
472 struct perf_cgroup *cgrp; /* cgroup event is attach to */
473 int cgrp_defer_enabled;
476 #endif /* CONFIG_PERF_EVENTS */
480 * struct perf_event_context - event context structure
482 * Used as a container for task events and CPU events as well:
484 struct perf_event_context {
487 * Protect the states of the events in the list,
488 * nr_active, and the list:
492 * Protect the list of events. Locking either mutex or lock
493 * is sufficient to ensure the list doesn't change; to change
494 * the list you need to lock both the mutex and the spinlock.
498 struct list_head active_ctx_list;
499 struct list_head pinned_groups;
500 struct list_head flexible_groups;
501 struct list_head event_list;
509 struct task_struct *task;
512 * Context clock, runs when context enabled.
518 * These fields let us detect when two contexts have both
519 * been cloned (inherited) from a common ancestor.
521 struct perf_event_context *parent_ctx;
525 int nr_cgroups; /* cgroup evts */
526 void *task_ctx_data; /* pmu specific data */
527 struct rcu_head rcu_head;
529 struct delayed_work orphans_remove;
530 bool orphans_remove_sched;
534 * Number of contexts where an event can trigger:
535 * task, softirq, hardirq, nmi.
537 #define PERF_NR_CONTEXTS 4
540 * struct perf_event_cpu_context - per cpu event context structure
542 struct perf_cpu_context {
543 struct perf_event_context ctx;
544 struct perf_event_context *task_ctx;
547 struct hrtimer hrtimer;
548 ktime_t hrtimer_interval;
549 struct pmu *unique_pmu;
550 struct perf_cgroup *cgrp;
553 struct perf_output_handle {
554 struct perf_event *event;
555 struct ring_buffer *rb;
556 unsigned long wakeup;
562 #ifdef CONFIG_CGROUP_PERF
565 * perf_cgroup_info keeps track of time_enabled for a cgroup.
566 * This is a per-cpu dynamically allocated data structure.
568 struct perf_cgroup_info {
574 struct cgroup_subsys_state css;
575 struct perf_cgroup_info __percpu *info;
579 * Must ensure cgroup is pinned (css_get) before calling
580 * this function. In other words, we cannot call this function
581 * if there is no cgroup event for the current CPU context.
583 static inline struct perf_cgroup *
584 perf_cgroup_from_task(struct task_struct *task)
586 return container_of(task_css(task, perf_event_cgrp_id),
587 struct perf_cgroup, css);
589 #endif /* CONFIG_CGROUP_PERF */
591 #ifdef CONFIG_PERF_EVENTS
593 extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
594 extern void perf_pmu_unregister(struct pmu *pmu);
596 extern int perf_num_counters(void);
597 extern const char *perf_pmu_name(void);
598 extern void __perf_event_task_sched_in(struct task_struct *prev,
599 struct task_struct *task);
600 extern void __perf_event_task_sched_out(struct task_struct *prev,
601 struct task_struct *next);
602 extern int perf_event_init_task(struct task_struct *child);
603 extern void perf_event_exit_task(struct task_struct *child);
604 extern void perf_event_free_task(struct task_struct *task);
605 extern void perf_event_delayed_put(struct task_struct *task);
606 extern void perf_event_print_debug(void);
607 extern void perf_pmu_disable(struct pmu *pmu);
608 extern void perf_pmu_enable(struct pmu *pmu);
609 extern void perf_sched_cb_dec(struct pmu *pmu);
610 extern void perf_sched_cb_inc(struct pmu *pmu);
611 extern int perf_event_task_disable(void);
612 extern int perf_event_task_enable(void);
613 extern int perf_event_refresh(struct perf_event *event, int refresh);
614 extern void perf_event_update_userpage(struct perf_event *event);
615 extern int perf_event_release_kernel(struct perf_event *event);
616 extern struct perf_event *
617 perf_event_create_kernel_counter(struct perf_event_attr *attr,
619 struct task_struct *task,
620 perf_overflow_handler_t callback,
622 extern void perf_pmu_migrate_context(struct pmu *pmu,
623 int src_cpu, int dst_cpu);
624 extern u64 perf_event_read_value(struct perf_event *event,
625 u64 *enabled, u64 *running);
628 struct perf_sample_data {
630 * Fields set by perf_sample_data_init(), group so as to
631 * minimize the cachelines touched.
634 struct perf_raw_record *raw;
635 struct perf_branch_stack *br_stack;
639 union perf_mem_data_src data_src;
642 * The other fields, optionally {set,used} by
643 * perf_{prepare,output}_sample().
658 struct perf_callchain_entry *callchain;
661 * regs_user may point to task_pt_regs or to regs_user_copy, depending
664 struct perf_regs regs_user;
665 struct pt_regs regs_user_copy;
667 struct perf_regs regs_intr;
669 } ____cacheline_aligned;
671 /* default value for data source */
672 #define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\
673 PERF_MEM_S(LVL, NA) |\
674 PERF_MEM_S(SNOOP, NA) |\
675 PERF_MEM_S(LOCK, NA) |\
678 static inline void perf_sample_data_init(struct perf_sample_data *data,
679 u64 addr, u64 period)
681 /* remaining struct members initialized in perf_prepare_sample() */
684 data->br_stack = NULL;
685 data->period = period;
687 data->data_src.val = PERF_MEM_NA;
691 extern void perf_output_sample(struct perf_output_handle *handle,
692 struct perf_event_header *header,
693 struct perf_sample_data *data,
694 struct perf_event *event);
695 extern void perf_prepare_sample(struct perf_event_header *header,
696 struct perf_sample_data *data,
697 struct perf_event *event,
698 struct pt_regs *regs);
700 extern int perf_event_overflow(struct perf_event *event,
701 struct perf_sample_data *data,
702 struct pt_regs *regs);
704 static inline bool is_sampling_event(struct perf_event *event)
706 return event->attr.sample_period != 0;
710 * Return 1 for a software event, 0 for a hardware event
712 static inline int is_software_event(struct perf_event *event)
714 return event->pmu->task_ctx_nr == perf_sw_context;
717 extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
719 extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64);
720 extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
722 #ifndef perf_arch_fetch_caller_regs
723 static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
727 * Take a snapshot of the regs. Skip ip and frame pointer to
728 * the nth caller. We only need a few of the regs:
729 * - ip for PERF_SAMPLE_IP
730 * - cs for user_mode() tests
731 * - bp for callchains
732 * - eflags, for future purposes, just in case
734 static inline void perf_fetch_caller_regs(struct pt_regs *regs)
736 memset(regs, 0, sizeof(*regs));
738 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
741 static __always_inline void
742 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
744 if (static_key_false(&perf_swevent_enabled[event_id]))
745 __perf_sw_event(event_id, nr, regs, addr);
748 DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]);
751 * 'Special' version for the scheduler, it hard assumes no recursion,
752 * which is guaranteed by us not actually scheduling inside other swevents
753 * because those disable preemption.
755 static __always_inline void
756 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr)
758 if (static_key_false(&perf_swevent_enabled[event_id])) {
759 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]);
761 perf_fetch_caller_regs(regs);
762 ___perf_sw_event(event_id, nr, regs, addr);
766 extern struct static_key_deferred perf_sched_events;
768 static inline void perf_event_task_sched_in(struct task_struct *prev,
769 struct task_struct *task)
771 if (static_key_false(&perf_sched_events.key))
772 __perf_event_task_sched_in(prev, task);
775 static inline void perf_event_task_sched_out(struct task_struct *prev,
776 struct task_struct *next)
778 perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0);
780 if (static_key_false(&perf_sched_events.key))
781 __perf_event_task_sched_out(prev, next);
784 static inline u64 __perf_event_count(struct perf_event *event)
786 return local64_read(&event->count) + atomic64_read(&event->child_count);
789 extern void perf_event_mmap(struct vm_area_struct *vma);
790 extern struct perf_guest_info_callbacks *perf_guest_cbs;
791 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
792 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
794 extern void perf_event_exec(void);
795 extern void perf_event_comm(struct task_struct *tsk, bool exec);
796 extern void perf_event_fork(struct task_struct *tsk);
799 DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
801 extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
802 extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
804 static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
806 if (entry->nr < PERF_MAX_STACK_DEPTH)
807 entry->ip[entry->nr++] = ip;
810 extern int sysctl_perf_event_paranoid;
811 extern int sysctl_perf_event_mlock;
812 extern int sysctl_perf_event_sample_rate;
813 extern int sysctl_perf_cpu_time_max_percent;
815 extern void perf_sample_event_took(u64 sample_len_ns);
817 extern int perf_proc_update_handler(struct ctl_table *table, int write,
818 void __user *buffer, size_t *lenp,
820 extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
821 void __user *buffer, size_t *lenp,
825 static inline bool perf_paranoid_tracepoint_raw(void)
827 return sysctl_perf_event_paranoid > -1;
830 static inline bool perf_paranoid_cpu(void)
832 return sysctl_perf_event_paranoid > 0;
835 static inline bool perf_paranoid_kernel(void)
837 return sysctl_perf_event_paranoid > 1;
840 extern void perf_event_init(void);
841 extern void perf_tp_event(u64 addr, u64 count, void *record,
842 int entry_size, struct pt_regs *regs,
843 struct hlist_head *head, int rctx,
844 struct task_struct *task);
845 extern void perf_bp_event(struct perf_event *event, void *data);
847 #ifndef perf_misc_flags
848 # define perf_misc_flags(regs) \
849 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
850 # define perf_instruction_pointer(regs) instruction_pointer(regs)
853 static inline bool has_branch_stack(struct perf_event *event)
855 return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
858 static inline bool needs_branch_stack(struct perf_event *event)
860 return event->attr.branch_sample_type != 0;
863 extern int perf_output_begin(struct perf_output_handle *handle,
864 struct perf_event *event, unsigned int size);
865 extern void perf_output_end(struct perf_output_handle *handle);
866 extern unsigned int perf_output_copy(struct perf_output_handle *handle,
867 const void *buf, unsigned int len);
868 extern unsigned int perf_output_skip(struct perf_output_handle *handle,
870 extern int perf_swevent_get_recursion_context(void);
871 extern void perf_swevent_put_recursion_context(int rctx);
872 extern u64 perf_swevent_set_period(struct perf_event *event);
873 extern void perf_event_enable(struct perf_event *event);
874 extern void perf_event_disable(struct perf_event *event);
875 extern int __perf_event_disable(void *info);
876 extern void perf_event_task_tick(void);
877 #else /* !CONFIG_PERF_EVENTS: */
879 perf_event_task_sched_in(struct task_struct *prev,
880 struct task_struct *task) { }
882 perf_event_task_sched_out(struct task_struct *prev,
883 struct task_struct *next) { }
884 static inline int perf_event_init_task(struct task_struct *child) { return 0; }
885 static inline void perf_event_exit_task(struct task_struct *child) { }
886 static inline void perf_event_free_task(struct task_struct *task) { }
887 static inline void perf_event_delayed_put(struct task_struct *task) { }
888 static inline void perf_event_print_debug(void) { }
889 static inline int perf_event_task_disable(void) { return -EINVAL; }
890 static inline int perf_event_task_enable(void) { return -EINVAL; }
891 static inline int perf_event_refresh(struct perf_event *event, int refresh)
897 perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
899 perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) { }
901 perf_bp_event(struct perf_event *event, void *data) { }
903 static inline int perf_register_guest_info_callbacks
904 (struct perf_guest_info_callbacks *callbacks) { return 0; }
905 static inline int perf_unregister_guest_info_callbacks
906 (struct perf_guest_info_callbacks *callbacks) { return 0; }
908 static inline void perf_event_mmap(struct vm_area_struct *vma) { }
909 static inline void perf_event_exec(void) { }
910 static inline void perf_event_comm(struct task_struct *tsk, bool exec) { }
911 static inline void perf_event_fork(struct task_struct *tsk) { }
912 static inline void perf_event_init(void) { }
913 static inline int perf_swevent_get_recursion_context(void) { return -1; }
914 static inline void perf_swevent_put_recursion_context(int rctx) { }
915 static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; }
916 static inline void perf_event_enable(struct perf_event *event) { }
917 static inline void perf_event_disable(struct perf_event *event) { }
918 static inline int __perf_event_disable(void *info) { return -1; }
919 static inline void perf_event_task_tick(void) { }
922 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
923 extern bool perf_event_can_stop_tick(void);
925 static inline bool perf_event_can_stop_tick(void) { return true; }
928 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
929 extern void perf_restore_debug_store(void);
931 static inline void perf_restore_debug_store(void) { }
934 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
937 * This has to have a higher priority than migration_notifier in sched/core.c.
939 #define perf_cpu_notifier(fn) \
941 static struct notifier_block fn##_nb = \
942 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
943 unsigned long cpu = smp_processor_id(); \
944 unsigned long flags; \
946 cpu_notifier_register_begin(); \
947 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
948 (void *)(unsigned long)cpu); \
949 local_irq_save(flags); \
950 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
951 (void *)(unsigned long)cpu); \
952 local_irq_restore(flags); \
953 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
954 (void *)(unsigned long)cpu); \
955 __register_cpu_notifier(&fn##_nb); \
956 cpu_notifier_register_done(); \
960 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
961 * callback for already online CPUs.
963 #define __perf_cpu_notifier(fn) \
965 static struct notifier_block fn##_nb = \
966 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
968 __register_cpu_notifier(&fn##_nb); \
971 struct perf_pmu_events_attr {
972 struct device_attribute attr;
974 const char *event_str;
977 ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
980 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
981 static struct perf_pmu_events_attr _var = { \
982 .attr = __ATTR(_name, 0444, _show, NULL), \
986 #define PMU_EVENT_ATTR_STRING(_name, _var, _str) \
987 static struct perf_pmu_events_attr _var = { \
988 .attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \
993 #define PMU_FORMAT_ATTR(_name, _format) \
995 _name##_show(struct device *dev, \
996 struct device_attribute *attr, \
999 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
1000 return sprintf(page, _format "\n"); \
1003 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
1005 #endif /* _LINUX_PERF_EVENT_H */