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1 | /* |
2 | * Performance events: |
3 | * |
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 |
7 | * |
8 | * Data type definitions, declarations, prototypes. |
9 | * |
10 | * Started by: Thomas Gleixner and Ingo Molnar |
11 | * |
12 | * For licencing details see kernel-base/COPYING |
13 | */ |
14 | #ifndef _LINUX_PERF_EVENT_H |
15 | #define _LINUX_PERF_EVENT_H |
16 | |
17 | #include <uapi/linux/perf_event.h> |
18 | |
19 | /* |
20 | * Kernel-internal data types and definitions: |
21 | */ |
22 | |
23 | #ifdef CONFIG_PERF_EVENTS |
24 | # include <asm/perf_event.h> |
25 | # include <asm/local64.h> |
26 | #endif |
27 | |
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); |
32 | }; |
33 | |
34 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
35 | #include <asm/hw_breakpoint.h> |
36 | #endif |
37 | |
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> |
44 | #include <linux/fs.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/atomic.h> |
52 | #include <linux/sysfs.h> |
53 | #include <linux/perf_regs.h> |
54 | #include <asm/local.h> |
55 | |
56 | struct perf_callchain_entry { |
57 | __u64 nr; |
58 | __u64 ip[PERF_MAX_STACK_DEPTH]; |
59 | }; |
60 | |
61 | struct perf_raw_record { |
62 | u32 size; |
63 | void *data; |
64 | }; |
65 | |
66 | /* |
67 | * single taken branch record layout: |
68 | * |
69 | * from: source instruction (may not always be a branch insn) |
70 | * to: branch target |
71 | * mispred: branch target was mispredicted |
72 | * predicted: branch target was predicted |
73 | * |
74 | * support for mispred, predicted is optional. In case it |
75 | * is not supported mispred = predicted = 0. |
76 | * |
77 | * in_tx: running in a hardware transaction |
78 | * abort: aborting a hardware transaction |
79 | */ |
80 | struct perf_branch_entry { |
81 | __u64 from; |
82 | __u64 to; |
83 | __u64 mispred:1, /* target mispredicted */ |
84 | predicted:1,/* target predicted */ |
85 | in_tx:1, /* in transaction */ |
86 | abort:1, /* transaction abort */ |
87 | reserved:60; |
88 | }; |
89 | |
90 | /* |
91 | * branch stack layout: |
92 | * nr: number of taken branches stored in entries[] |
93 | * |
94 | * Note that nr can vary from sample to sample |
95 | * branches (to, from) are stored from most recent |
96 | * to least recent, i.e., entries[0] contains the most |
97 | * recent branch. |
98 | */ |
99 | struct perf_branch_stack { |
100 | __u64 nr; |
101 | struct perf_branch_entry entries[0]; |
102 | }; |
103 | |
104 | struct perf_regs_user { |
105 | __u64 abi; |
106 | struct pt_regs *regs; |
107 | }; |
108 | |
109 | struct task_struct; |
110 | |
111 | /* |
112 | * extra PMU register associated with an event |
113 | */ |
114 | struct hw_perf_event_extra { |
115 | u64 config; /* register value */ |
116 | unsigned int reg; /* register address or index */ |
117 | int alloc; /* extra register already allocated */ |
118 | int idx; /* index in shared_regs->regs[] */ |
119 | }; |
120 | |
121 | struct event_constraint; |
122 | |
123 | /** |
124 | * struct hw_perf_event - performance event hardware details: |
125 | */ |
126 | struct hw_perf_event { |
127 | #ifdef CONFIG_PERF_EVENTS |
128 | union { |
129 | struct { /* hardware */ |
130 | u64 config; |
131 | u64 last_tag; |
132 | unsigned long config_base; |
133 | unsigned long event_base; |
134 | int event_base_rdpmc; |
135 | int idx; |
136 | int last_cpu; |
137 | int flags; |
138 | |
139 | struct hw_perf_event_extra extra_reg; |
140 | struct hw_perf_event_extra branch_reg; |
141 | |
142 | struct event_constraint *constraint; |
143 | }; |
144 | struct { /* software */ |
145 | struct hrtimer hrtimer; |
146 | }; |
147 | struct { /* tracepoint */ |
148 | struct task_struct *tp_target; |
149 | /* for tp_event->class */ |
150 | struct list_head tp_list; |
151 | }; |
152 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
153 | struct { /* breakpoint */ |
154 | /* |
155 | * Crufty hack to avoid the chicken and egg |
156 | * problem hw_breakpoint has with context |
157 | * creation and event initalization. |
158 | */ |
159 | struct task_struct *bp_target; |
160 | struct arch_hw_breakpoint info; |
161 | struct list_head bp_list; |
162 | }; |
163 | #endif |
164 | }; |
165 | int state; |
166 | local64_t prev_count; |
167 | u64 sample_period; |
168 | u64 last_period; |
169 | local64_t period_left; |
170 | u64 interrupts_seq; |
171 | u64 interrupts; |
172 | |
173 | u64 freq_time_stamp; |
174 | u64 freq_count_stamp; |
175 | #endif |
176 | }; |
177 | |
178 | /* |
179 | * hw_perf_event::state flags |
180 | */ |
181 | #define PERF_HES_STOPPED 0x01 /* the counter is stopped */ |
182 | #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */ |
183 | #define PERF_HES_ARCH 0x04 |
184 | |
185 | struct perf_event; |
186 | |
187 | /* |
188 | * Common implementation detail of pmu::{start,commit,cancel}_txn |
189 | */ |
190 | #define PERF_EVENT_TXN 0x1 |
191 | |
192 | /** |
193 | * struct pmu - generic performance monitoring unit |
194 | */ |
195 | struct pmu { |
196 | struct list_head entry; |
197 | |
198 | struct device *dev; |
199 | const struct attribute_group **attr_groups; |
200 | const char *name; |
201 | int type; |
202 | |
203 | int * __percpu pmu_disable_count; |
204 | struct perf_cpu_context * __percpu pmu_cpu_context; |
205 | int task_ctx_nr; |
206 | int hrtimer_interval_ms; |
207 | |
208 | /* |
209 | * Fully disable/enable this PMU, can be used to protect from the PMI |
210 | * as well as for lazy/batch writing of the MSRs. |
211 | */ |
212 | void (*pmu_enable) (struct pmu *pmu); /* optional */ |
213 | void (*pmu_disable) (struct pmu *pmu); /* optional */ |
214 | |
215 | /* |
216 | * Try and initialize the event for this PMU. |
217 | * Should return -ENOENT when the @event doesn't match this PMU. |
218 | */ |
219 | int (*event_init) (struct perf_event *event); |
220 | |
221 | #define PERF_EF_START 0x01 /* start the counter when adding */ |
222 | #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */ |
223 | #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */ |
224 | |
225 | /* |
226 | * Adds/Removes a counter to/from the PMU, can be done inside |
227 | * a transaction, see the ->*_txn() methods. |
228 | */ |
229 | int (*add) (struct perf_event *event, int flags); |
230 | void (*del) (struct perf_event *event, int flags); |
231 | |
232 | /* |
233 | * Starts/Stops a counter present on the PMU. The PMI handler |
234 | * should stop the counter when perf_event_overflow() returns |
235 | * !0. ->start() will be used to continue. |
236 | */ |
237 | void (*start) (struct perf_event *event, int flags); |
238 | void (*stop) (struct perf_event *event, int flags); |
239 | |
240 | /* |
241 | * Updates the counter value of the event. |
242 | */ |
243 | void (*read) (struct perf_event *event); |
244 | |
245 | /* |
246 | * Group events scheduling is treated as a transaction, add |
247 | * group events as a whole and perform one schedulability test. |
248 | * If the test fails, roll back the whole group |
249 | * |
250 | * Start the transaction, after this ->add() doesn't need to |
251 | * do schedulability tests. |
252 | */ |
253 | void (*start_txn) (struct pmu *pmu); /* optional */ |
254 | /* |
255 | * If ->start_txn() disabled the ->add() schedulability test |
256 | * then ->commit_txn() is required to perform one. On success |
257 | * the transaction is closed. On error the transaction is kept |
258 | * open until ->cancel_txn() is called. |
259 | */ |
260 | int (*commit_txn) (struct pmu *pmu); /* optional */ |
261 | /* |
262 | * Will cancel the transaction, assumes ->del() is called |
263 | * for each successful ->add() during the transaction. |
264 | */ |
265 | void (*cancel_txn) (struct pmu *pmu); /* optional */ |
266 | |
267 | /* |
268 | * Will return the value for perf_event_mmap_page::index for this event, |
269 | * if no implementation is provided it will default to: event->hw.idx + 1. |
270 | */ |
271 | int (*event_idx) (struct perf_event *event); /*optional */ |
272 | |
273 | /* |
274 | * flush branch stack on context-switches (needed in cpu-wide mode) |
275 | */ |
276 | void (*flush_branch_stack) (void); |
277 | }; |
278 | |
279 | /** |
280 | * enum perf_event_active_state - the states of a event |
281 | */ |
282 | enum perf_event_active_state { |
283 | PERF_EVENT_STATE_ERROR = -2, |
284 | PERF_EVENT_STATE_OFF = -1, |
285 | PERF_EVENT_STATE_INACTIVE = 0, |
286 | PERF_EVENT_STATE_ACTIVE = 1, |
287 | }; |
288 | |
289 | struct file; |
290 | struct perf_sample_data; |
291 | |
292 | typedef void (*perf_overflow_handler_t)(struct perf_event *, |
293 | struct perf_sample_data *, |
294 | struct pt_regs *regs); |
295 | |
296 | enum perf_group_flag { |
297 | PERF_GROUP_SOFTWARE = 0x1, |
298 | }; |
299 | |
300 | #define SWEVENT_HLIST_BITS 8 |
301 | #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS) |
302 | |
303 | struct swevent_hlist { |
304 | struct hlist_head heads[SWEVENT_HLIST_SIZE]; |
305 | struct rcu_head rcu_head; |
306 | }; |
307 | |
308 | #define PERF_ATTACH_CONTEXT 0x01 |
309 | #define PERF_ATTACH_GROUP 0x02 |
310 | #define PERF_ATTACH_TASK 0x04 |
311 | |
312 | struct perf_cgroup; |
313 | struct ring_buffer; |
314 | |
315 | /** |
316 | * struct perf_event - performance event kernel representation: |
317 | */ |
318 | struct perf_event { |
319 | #ifdef CONFIG_PERF_EVENTS |
320 | struct list_head group_entry; |
321 | struct list_head event_entry; |
322 | struct list_head sibling_list; |
323 | struct hlist_node hlist_entry; |
324 | int nr_siblings; |
325 | int group_flags; |
326 | struct perf_event *group_leader; |
327 | struct pmu *pmu; |
328 | |
329 | enum perf_event_active_state state; |
330 | unsigned int attach_state; |
331 | local64_t count; |
332 | atomic64_t child_count; |
333 | |
334 | /* |
335 | * These are the total time in nanoseconds that the event |
336 | * has been enabled (i.e. eligible to run, and the task has |
337 | * been scheduled in, if this is a per-task event) |
338 | * and running (scheduled onto the CPU), respectively. |
339 | * |
340 | * They are computed from tstamp_enabled, tstamp_running and |
341 | * tstamp_stopped when the event is in INACTIVE or ACTIVE state. |
342 | */ |
343 | u64 total_time_enabled; |
344 | u64 total_time_running; |
345 | |
346 | /* |
347 | * These are timestamps used for computing total_time_enabled |
348 | * and total_time_running when the event is in INACTIVE or |
349 | * ACTIVE state, measured in nanoseconds from an arbitrary point |
350 | * in time. |
351 | * tstamp_enabled: the notional time when the event was enabled |
352 | * tstamp_running: the notional time when the event was scheduled on |
353 | * tstamp_stopped: in INACTIVE state, the notional time when the |
354 | * event was scheduled off. |
355 | */ |
356 | u64 tstamp_enabled; |
357 | u64 tstamp_running; |
358 | u64 tstamp_stopped; |
359 | |
360 | /* |
361 | * timestamp shadows the actual context timing but it can |
362 | * be safely used in NMI interrupt context. It reflects the |
363 | * context time as it was when the event was last scheduled in. |
364 | * |
365 | * ctx_time already accounts for ctx->timestamp. Therefore to |
366 | * compute ctx_time for a sample, simply add perf_clock(). |
367 | */ |
368 | u64 shadow_ctx_time; |
369 | |
370 | struct perf_event_attr attr; |
371 | u16 header_size; |
372 | u16 id_header_size; |
373 | u16 read_size; |
374 | struct hw_perf_event hw; |
375 | |
376 | struct perf_event_context *ctx; |
377 | atomic_long_t refcount; |
378 | |
379 | /* |
380 | * These accumulate total time (in nanoseconds) that children |
381 | * events have been enabled and running, respectively. |
382 | */ |
383 | atomic64_t child_total_time_enabled; |
384 | atomic64_t child_total_time_running; |
385 | |
386 | /* |
387 | * Protect attach/detach and child_list: |
388 | */ |
389 | struct mutex child_mutex; |
390 | struct list_head child_list; |
391 | struct perf_event *parent; |
392 | |
393 | int oncpu; |
394 | int cpu; |
395 | |
396 | struct list_head owner_entry; |
397 | struct task_struct *owner; |
398 | |
399 | /* mmap bits */ |
400 | struct mutex mmap_mutex; |
401 | atomic_t mmap_count; |
402 | |
403 | struct ring_buffer *rb; |
404 | struct list_head rb_entry; |
405 | |
406 | /* poll related */ |
407 | wait_queue_head_t waitq; |
408 | struct fasync_struct *fasync; |
409 | |
410 | /* delayed work for NMIs and such */ |
411 | int pending_wakeup; |
412 | int pending_kill; |
413 | int pending_disable; |
414 | struct irq_work pending; |
415 | |
416 | atomic_t event_limit; |
417 | |
418 | void (*destroy)(struct perf_event *); |
419 | struct rcu_head rcu_head; |
420 | |
421 | struct pid_namespace *ns; |
422 | u64 id; |
423 | |
424 | perf_overflow_handler_t overflow_handler; |
425 | void *overflow_handler_context; |
426 | |
427 | #ifdef CONFIG_EVENT_TRACING |
428 | struct ftrace_event_call *tp_event; |
429 | struct event_filter *filter; |
430 | #ifdef CONFIG_FUNCTION_TRACER |
431 | struct ftrace_ops ftrace_ops; |
432 | #endif |
433 | #endif |
434 | |
435 | #ifdef CONFIG_CGROUP_PERF |
436 | struct perf_cgroup *cgrp; /* cgroup event is attach to */ |
437 | int cgrp_defer_enabled; |
438 | #endif |
439 | |
440 | #endif /* CONFIG_PERF_EVENTS */ |
441 | }; |
442 | |
443 | enum perf_event_context_type { |
444 | task_context, |
445 | cpu_context, |
446 | }; |
447 | |
448 | /** |
449 | * struct perf_event_context - event context structure |
450 | * |
451 | * Used as a container for task events and CPU events as well: |
452 | */ |
453 | struct perf_event_context { |
454 | struct pmu *pmu; |
455 | enum perf_event_context_type type; |
456 | /* |
457 | * Protect the states of the events in the list, |
458 | * nr_active, and the list: |
459 | */ |
460 | raw_spinlock_t lock; |
461 | /* |
462 | * Protect the list of events. Locking either mutex or lock |
463 | * is sufficient to ensure the list doesn't change; to change |
464 | * the list you need to lock both the mutex and the spinlock. |
465 | */ |
466 | struct mutex mutex; |
467 | |
468 | struct list_head pinned_groups; |
469 | struct list_head flexible_groups; |
470 | struct list_head event_list; |
471 | int nr_events; |
472 | int nr_active; |
473 | int is_active; |
474 | int nr_stat; |
475 | int nr_freq; |
476 | int rotate_disable; |
477 | atomic_t refcount; |
478 | struct task_struct *task; |
479 | |
480 | /* |
481 | * Context clock, runs when context enabled. |
482 | */ |
483 | u64 time; |
484 | u64 timestamp; |
485 | |
486 | /* |
487 | * These fields let us detect when two contexts have both |
488 | * been cloned (inherited) from a common ancestor. |
489 | */ |
490 | struct perf_event_context *parent_ctx; |
491 | u64 parent_gen; |
492 | u64 generation; |
493 | int pin_count; |
494 | int nr_cgroups; /* cgroup evts */ |
495 | int nr_branch_stack; /* branch_stack evt */ |
496 | struct rcu_head rcu_head; |
497 | }; |
498 | |
499 | /* |
500 | * Number of contexts where an event can trigger: |
501 | * task, softirq, hardirq, nmi. |
502 | */ |
503 | #define PERF_NR_CONTEXTS 4 |
504 | |
505 | /** |
506 | * struct perf_event_cpu_context - per cpu event context structure |
507 | */ |
508 | struct perf_cpu_context { |
509 | struct perf_event_context ctx; |
510 | struct perf_event_context *task_ctx; |
511 | int active_oncpu; |
512 | int exclusive; |
513 | struct hrtimer hrtimer; |
514 | ktime_t hrtimer_interval; |
515 | struct list_head rotation_list; |
516 | struct pmu *unique_pmu; |
517 | struct perf_cgroup *cgrp; |
518 | }; |
519 | |
520 | struct perf_output_handle { |
521 | struct perf_event *event; |
522 | struct ring_buffer *rb; |
523 | unsigned long wakeup; |
524 | unsigned long size; |
525 | void *addr; |
526 | int page; |
527 | }; |
528 | |
529 | #ifdef CONFIG_PERF_EVENTS |
530 | |
531 | extern int perf_pmu_register(struct pmu *pmu, const char *name, int type); |
532 | extern void perf_pmu_unregister(struct pmu *pmu); |
533 | |
534 | extern int perf_num_counters(void); |
535 | extern const char *perf_pmu_name(void); |
536 | extern void __perf_event_task_sched_in(struct task_struct *prev, |
537 | struct task_struct *task); |
538 | extern void __perf_event_task_sched_out(struct task_struct *prev, |
539 | struct task_struct *next); |
540 | extern int perf_event_init_task(struct task_struct *child); |
541 | extern void perf_event_exit_task(struct task_struct *child); |
542 | extern void perf_event_free_task(struct task_struct *task); |
543 | extern void perf_event_delayed_put(struct task_struct *task); |
544 | extern void perf_event_print_debug(void); |
545 | extern void perf_pmu_disable(struct pmu *pmu); |
546 | extern void perf_pmu_enable(struct pmu *pmu); |
547 | extern int perf_event_task_disable(void); |
548 | extern int perf_event_task_enable(void); |
549 | extern int perf_event_refresh(struct perf_event *event, int refresh); |
550 | extern void perf_event_update_userpage(struct perf_event *event); |
551 | extern int perf_event_release_kernel(struct perf_event *event); |
552 | extern struct perf_event * |
553 | perf_event_create_kernel_counter(struct perf_event_attr *attr, |
554 | int cpu, |
555 | struct task_struct *task, |
556 | perf_overflow_handler_t callback, |
557 | void *context); |
558 | extern void perf_pmu_migrate_context(struct pmu *pmu, |
559 | int src_cpu, int dst_cpu); |
560 | extern u64 perf_event_read_value(struct perf_event *event, |
561 | u64 *enabled, u64 *running); |
562 | |
563 | |
564 | struct perf_sample_data { |
565 | u64 type; |
566 | |
567 | u64 ip; |
568 | struct { |
569 | u32 pid; |
570 | u32 tid; |
571 | } tid_entry; |
572 | u64 time; |
573 | u64 addr; |
574 | u64 id; |
575 | u64 stream_id; |
576 | struct { |
577 | u32 cpu; |
578 | u32 reserved; |
579 | } cpu_entry; |
580 | u64 period; |
581 | union perf_mem_data_src data_src; |
582 | struct perf_callchain_entry *callchain; |
583 | struct perf_raw_record *raw; |
584 | struct perf_branch_stack *br_stack; |
585 | struct perf_regs_user regs_user; |
586 | u64 stack_user_size; |
587 | u64 weight; |
588 | }; |
589 | |
590 | static inline void perf_sample_data_init(struct perf_sample_data *data, |
591 | u64 addr, u64 period) |
592 | { |
593 | /* remaining struct members initialized in perf_prepare_sample() */ |
594 | data->addr = addr; |
595 | data->raw = NULL; |
596 | data->br_stack = NULL; |
597 | data->period = period; |
598 | data->regs_user.abi = PERF_SAMPLE_REGS_ABI_NONE; |
599 | data->regs_user.regs = NULL; |
600 | data->stack_user_size = 0; |
601 | data->weight = 0; |
602 | data->data_src.val = 0; |
603 | } |
604 | |
605 | extern void perf_output_sample(struct perf_output_handle *handle, |
606 | struct perf_event_header *header, |
607 | struct perf_sample_data *data, |
608 | struct perf_event *event); |
609 | extern void perf_prepare_sample(struct perf_event_header *header, |
610 | struct perf_sample_data *data, |
611 | struct perf_event *event, |
612 | struct pt_regs *regs); |
613 | |
614 | extern int perf_event_overflow(struct perf_event *event, |
615 | struct perf_sample_data *data, |
616 | struct pt_regs *regs); |
617 | |
618 | static inline bool is_sampling_event(struct perf_event *event) |
619 | { |
620 | return event->attr.sample_period != 0; |
621 | } |
622 | |
623 | /* |
624 | * Return 1 for a software event, 0 for a hardware event |
625 | */ |
626 | static inline int is_software_event(struct perf_event *event) |
627 | { |
628 | return event->pmu->task_ctx_nr == perf_sw_context; |
629 | } |
630 | |
631 | extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX]; |
632 | |
633 | extern void __perf_sw_event(u32, u64, struct pt_regs *, u64); |
634 | |
635 | #ifndef perf_arch_fetch_caller_regs |
636 | static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { } |
637 | #endif |
638 | |
639 | /* |
640 | * Take a snapshot of the regs. Skip ip and frame pointer to |
641 | * the nth caller. We only need a few of the regs: |
642 | * - ip for PERF_SAMPLE_IP |
643 | * - cs for user_mode() tests |
644 | * - bp for callchains |
645 | * - eflags, for future purposes, just in case |
646 | */ |
647 | static inline void perf_fetch_caller_regs(struct pt_regs *regs) |
648 | { |
649 | memset(regs, 0, sizeof(*regs)); |
650 | |
651 | perf_arch_fetch_caller_regs(regs, CALLER_ADDR0); |
652 | } |
653 | |
654 | static __always_inline void |
655 | perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) |
656 | { |
657 | struct pt_regs hot_regs; |
658 | |
659 | if (static_key_false(&perf_swevent_enabled[event_id])) { |
660 | if (!regs) { |
661 | perf_fetch_caller_regs(&hot_regs); |
662 | regs = &hot_regs; |
663 | } |
664 | __perf_sw_event(event_id, nr, regs, addr); |
665 | } |
666 | } |
667 | |
668 | extern struct static_key_deferred perf_sched_events; |
669 | |
670 | static inline void perf_event_task_sched_in(struct task_struct *prev, |
671 | struct task_struct *task) |
672 | { |
673 | if (static_key_false(&perf_sched_events.key)) |
674 | __perf_event_task_sched_in(prev, task); |
675 | } |
676 | |
677 | static inline void perf_event_task_sched_out(struct task_struct *prev, |
678 | struct task_struct *next) |
679 | { |
680 | perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0); |
681 | |
682 | if (static_key_false(&perf_sched_events.key)) |
683 | __perf_event_task_sched_out(prev, next); |
684 | } |
685 | |
686 | extern void perf_event_mmap(struct vm_area_struct *vma); |
687 | extern struct perf_guest_info_callbacks *perf_guest_cbs; |
688 | extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks); |
689 | extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks); |
690 | |
691 | extern void perf_event_comm(struct task_struct *tsk); |
692 | extern void perf_event_fork(struct task_struct *tsk); |
693 | |
694 | /* Callchains */ |
695 | DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry); |
696 | |
697 | extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs); |
698 | extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs); |
699 | |
700 | static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip) |
701 | { |
702 | if (entry->nr < PERF_MAX_STACK_DEPTH) |
703 | entry->ip[entry->nr++] = ip; |
704 | } |
705 | |
706 | extern int sysctl_perf_event_paranoid; |
707 | extern int sysctl_perf_event_mlock; |
708 | extern int sysctl_perf_event_sample_rate; |
709 | extern int sysctl_perf_cpu_time_max_percent; |
710 | |
711 | extern void perf_sample_event_took(u64 sample_len_ns); |
712 | |
713 | extern int perf_proc_update_handler(struct ctl_table *table, int write, |
714 | void __user *buffer, size_t *lenp, |
715 | loff_t *ppos); |
716 | extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write, |
717 | void __user *buffer, size_t *lenp, |
718 | loff_t *ppos); |
719 | |
720 | |
721 | static inline bool perf_paranoid_tracepoint_raw(void) |
722 | { |
723 | return sysctl_perf_event_paranoid > -1; |
724 | } |
725 | |
726 | static inline bool perf_paranoid_cpu(void) |
727 | { |
728 | return sysctl_perf_event_paranoid > 0; |
729 | } |
730 | |
731 | static inline bool perf_paranoid_kernel(void) |
732 | { |
733 | return sysctl_perf_event_paranoid > 1; |
734 | } |
735 | |
736 | extern void perf_event_init(void); |
737 | extern void perf_tp_event(u64 addr, u64 count, void *record, |
738 | int entry_size, struct pt_regs *regs, |
739 | struct hlist_head *head, int rctx, |
740 | struct task_struct *task); |
741 | extern void perf_bp_event(struct perf_event *event, void *data); |
742 | |
743 | #ifndef perf_misc_flags |
744 | # define perf_misc_flags(regs) \ |
745 | (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL) |
746 | # define perf_instruction_pointer(regs) instruction_pointer(regs) |
747 | #endif |
748 | |
749 | static inline bool has_branch_stack(struct perf_event *event) |
750 | { |
751 | return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK; |
752 | } |
753 | |
754 | extern int perf_output_begin(struct perf_output_handle *handle, |
755 | struct perf_event *event, unsigned int size); |
756 | extern void perf_output_end(struct perf_output_handle *handle); |
757 | extern unsigned int perf_output_copy(struct perf_output_handle *handle, |
758 | const void *buf, unsigned int len); |
759 | extern unsigned int perf_output_skip(struct perf_output_handle *handle, |
760 | unsigned int len); |
761 | extern int perf_swevent_get_recursion_context(void); |
762 | extern void perf_swevent_put_recursion_context(int rctx); |
763 | extern u64 perf_swevent_set_period(struct perf_event *event); |
764 | extern void perf_event_enable(struct perf_event *event); |
765 | extern void perf_event_disable(struct perf_event *event); |
766 | extern int __perf_event_disable(void *info); |
767 | extern void perf_event_task_tick(void); |
768 | #else |
769 | static inline void |
770 | perf_event_task_sched_in(struct task_struct *prev, |
771 | struct task_struct *task) { } |
772 | static inline void |
773 | perf_event_task_sched_out(struct task_struct *prev, |
774 | struct task_struct *next) { } |
775 | static inline int perf_event_init_task(struct task_struct *child) { return 0; } |
776 | static inline void perf_event_exit_task(struct task_struct *child) { } |
777 | static inline void perf_event_free_task(struct task_struct *task) { } |
778 | static inline void perf_event_delayed_put(struct task_struct *task) { } |
779 | static inline void perf_event_print_debug(void) { } |
780 | static inline int perf_event_task_disable(void) { return -EINVAL; } |
781 | static inline int perf_event_task_enable(void) { return -EINVAL; } |
782 | static inline int perf_event_refresh(struct perf_event *event, int refresh) |
783 | { |
784 | return -EINVAL; |
785 | } |
786 | |
787 | static inline void |
788 | perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { } |
789 | static inline void |
790 | perf_bp_event(struct perf_event *event, void *data) { } |
791 | |
792 | static inline int perf_register_guest_info_callbacks |
793 | (struct perf_guest_info_callbacks *callbacks) { return 0; } |
794 | static inline int perf_unregister_guest_info_callbacks |
795 | (struct perf_guest_info_callbacks *callbacks) { return 0; } |
796 | |
797 | static inline void perf_event_mmap(struct vm_area_struct *vma) { } |
798 | static inline void perf_event_comm(struct task_struct *tsk) { } |
799 | static inline void perf_event_fork(struct task_struct *tsk) { } |
800 | static inline void perf_event_init(void) { } |
801 | static inline int perf_swevent_get_recursion_context(void) { return -1; } |
802 | static inline void perf_swevent_put_recursion_context(int rctx) { } |
803 | static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; } |
804 | static inline void perf_event_enable(struct perf_event *event) { } |
805 | static inline void perf_event_disable(struct perf_event *event) { } |
806 | static inline int __perf_event_disable(void *info) { return -1; } |
807 | static inline void perf_event_task_tick(void) { } |
808 | #endif |
809 | |
810 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL) |
811 | extern bool perf_event_can_stop_tick(void); |
812 | #else |
813 | static inline bool perf_event_can_stop_tick(void) { return true; } |
814 | #endif |
815 | |
816 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL) |
817 | extern void perf_restore_debug_store(void); |
818 | #else |
819 | static inline void perf_restore_debug_store(void) { } |
820 | #endif |
821 | |
822 | #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x)) |
823 | |
824 | /* |
825 | * This has to have a higher priority than migration_notifier in sched/core.c. |
826 | */ |
827 | #define perf_cpu_notifier(fn) \ |
828 | do { \ |
829 | static struct notifier_block fn##_nb = \ |
830 | { .notifier_call = fn, .priority = CPU_PRI_PERF }; \ |
831 | unsigned long cpu = smp_processor_id(); \ |
832 | unsigned long flags; \ |
833 | fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \ |
834 | (void *)(unsigned long)cpu); \ |
835 | local_irq_save(flags); \ |
836 | fn(&fn##_nb, (unsigned long)CPU_STARTING, \ |
837 | (void *)(unsigned long)cpu); \ |
838 | local_irq_restore(flags); \ |
839 | fn(&fn##_nb, (unsigned long)CPU_ONLINE, \ |
840 | (void *)(unsigned long)cpu); \ |
841 | register_cpu_notifier(&fn##_nb); \ |
842 | } while (0) |
843 | |
844 | |
845 | struct perf_pmu_events_attr { |
846 | struct device_attribute attr; |
847 | u64 id; |
848 | const char *event_str; |
849 | }; |
850 | |
851 | #define PMU_EVENT_ATTR(_name, _var, _id, _show) \ |
852 | static struct perf_pmu_events_attr _var = { \ |
853 | .attr = __ATTR(_name, 0444, _show, NULL), \ |
854 | .id = _id, \ |
855 | }; |
856 | |
857 | #define PMU_FORMAT_ATTR(_name, _format) \ |
858 | static ssize_t \ |
859 | _name##_show(struct device *dev, \ |
860 | struct device_attribute *attr, \ |
861 | char *page) \ |
862 | { \ |
863 | BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \ |
864 | return sprintf(page, _format "\n"); \ |
865 | } \ |
866 | \ |
867 | static struct device_attribute format_attr_##_name = __ATTR_RO(_name) |
868 | |
869 | #endif /* _LINUX_PERF_EVENT_H */ |
870 |
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