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0793a61d 1/*
57c0c15b 2 * Performance events:
0793a61d 3 *
a308444c 4 * Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
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5 * Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
6 * Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
0793a61d 7 *
57c0c15b 8 * Data type definitions, declarations, prototypes.
0793a61d 9 *
a308444c 10 * Started by: Thomas Gleixner and Ingo Molnar
0793a61d 11 *
57c0c15b 12 * For licencing details see kernel-base/COPYING
0793a61d 13 */
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14#ifndef _LINUX_PERF_EVENT_H
15#define _LINUX_PERF_EVENT_H
0793a61d 16
607ca46e 17#include <uapi/linux/perf_event.h>
0793a61d 18
9f66a381 19/*
f3dfd265 20 * Kernel-internal data types and definitions:
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21 */
22
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23#ifdef CONFIG_PERF_EVENTS
24# include <asm/perf_event.h>
7be79236 25# include <asm/local64.h>
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26#endif
27
39447b38 28struct perf_guest_info_callbacks {
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29 int (*is_in_guest)(void);
30 int (*is_user_mode)(void);
31 unsigned long (*get_guest_ip)(void);
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32};
33
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34#ifdef CONFIG_HAVE_HW_BREAKPOINT
35#include <asm/hw_breakpoint.h>
36#endif
37
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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>
d6d020e9 43#include <linux/hrtimer.h>
3c446b3d 44#include <linux/fs.h>
709e50cf 45#include <linux/pid_namespace.h>
906010b2 46#include <linux/workqueue.h>
5331d7b8 47#include <linux/ftrace.h>
85cfabbc 48#include <linux/cpu.h>
e360adbe 49#include <linux/irq_work.h>
c5905afb 50#include <linux/static_key.h>
851cf6e7 51#include <linux/jump_label_ratelimit.h>
60063497 52#include <linux/atomic.h>
641cc938 53#include <linux/sysfs.h>
4018994f 54#include <linux/perf_regs.h>
fa588151 55#include <asm/local.h>
f3dfd265 56
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57struct perf_callchain_entry {
58 __u64 nr;
59 __u64 ip[PERF_MAX_STACK_DEPTH];
60};
61
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62struct perf_raw_record {
63 u32 size;
64 void *data;
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65};
66
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67/*
68 * branch stack layout:
69 * nr: number of taken branches stored in entries[]
70 *
71 * Note that nr can vary from sample to sample
72 * branches (to, from) are stored from most recent
73 * to least recent, i.e., entries[0] contains the most
74 * recent branch.
75 */
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76struct perf_branch_stack {
77 __u64 nr;
78 struct perf_branch_entry entries[0];
79};
80
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81struct perf_regs_user {
82 __u64 abi;
83 struct pt_regs *regs;
84};
85
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86struct task_struct;
87
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88/*
89 * extra PMU register associated with an event
90 */
91struct hw_perf_event_extra {
92 u64 config; /* register value */
93 unsigned int reg; /* register address or index */
94 int alloc; /* extra register already allocated */
95 int idx; /* index in shared_regs->regs[] */
96};
97
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98struct event_constraint;
99
0793a61d 100/**
cdd6c482 101 * struct hw_perf_event - performance event hardware details:
0793a61d 102 */
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103struct hw_perf_event {
104#ifdef CONFIG_PERF_EVENTS
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105 union {
106 struct { /* hardware */
a308444c 107 u64 config;
447a194b 108 u64 last_tag;
a308444c 109 unsigned long config_base;
cdd6c482 110 unsigned long event_base;
c48b6053 111 int event_base_rdpmc;
a308444c 112 int idx;
447a194b 113 int last_cpu;
9fac2cf3 114 int flags;
bce38cd5 115
efc9f05d 116 struct hw_perf_event_extra extra_reg;
bce38cd5 117 struct hw_perf_event_extra branch_reg;
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118
119 struct event_constraint *constraint;
d6d020e9 120 };
721a669b 121 struct { /* software */
a308444c 122 struct hrtimer hrtimer;
d6d020e9 123 };
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124 struct { /* tracepoint */
125 struct task_struct *tp_target;
126 /* for tp_event->class */
127 struct list_head tp_list;
128 };
24f1e32c 129#ifdef CONFIG_HAVE_HW_BREAKPOINT
45a73372 130 struct { /* breakpoint */
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131 /*
132 * Crufty hack to avoid the chicken and egg
133 * problem hw_breakpoint has with context
134 * creation and event initalization.
135 */
136 struct task_struct *bp_target;
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137 struct arch_hw_breakpoint info;
138 struct list_head bp_list;
45a73372 139 };
24f1e32c 140#endif
d6d020e9 141 };
a4eaf7f1 142 int state;
e7850595 143 local64_t prev_count;
b23f3325 144 u64 sample_period;
9e350de3 145 u64 last_period;
e7850595 146 local64_t period_left;
e050e3f0 147 u64 interrupts_seq;
60db5e09 148 u64 interrupts;
6a24ed6c 149
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150 u64 freq_time_stamp;
151 u64 freq_count_stamp;
ee06094f 152#endif
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153};
154
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155/*
156 * hw_perf_event::state flags
157 */
158#define PERF_HES_STOPPED 0x01 /* the counter is stopped */
159#define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
160#define PERF_HES_ARCH 0x04
161
cdd6c482 162struct perf_event;
621a01ea 163
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164/*
165 * Common implementation detail of pmu::{start,commit,cancel}_txn
166 */
167#define PERF_EVENT_TXN 0x1
6bde9b6c 168
621a01ea 169/**
4aeb0b42 170 * struct pmu - generic performance monitoring unit
621a01ea 171 */
4aeb0b42 172struct pmu {
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173 struct list_head entry;
174
abe43400 175 struct device *dev;
0c9d42ed 176 const struct attribute_group **attr_groups;
03d8e80b 177 const char *name;
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178 int type;
179
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180 int * __percpu pmu_disable_count;
181 struct perf_cpu_context * __percpu pmu_cpu_context;
8dc85d54 182 int task_ctx_nr;
62b85639 183 int hrtimer_interval_ms;
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184
185 /*
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186 * Fully disable/enable this PMU, can be used to protect from the PMI
187 * as well as for lazy/batch writing of the MSRs.
6bde9b6c 188 */
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189 void (*pmu_enable) (struct pmu *pmu); /* optional */
190 void (*pmu_disable) (struct pmu *pmu); /* optional */
6bde9b6c 191
8d2cacbb 192 /*
a4eaf7f1 193 * Try and initialize the event for this PMU.
24cd7f54 194 * Should return -ENOENT when the @event doesn't match this PMU.
8d2cacbb 195 */
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196 int (*event_init) (struct perf_event *event);
197
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198#define PERF_EF_START 0x01 /* start the counter when adding */
199#define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
200#define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
201
8d2cacbb 202 /*
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203 * Adds/Removes a counter to/from the PMU, can be done inside
204 * a transaction, see the ->*_txn() methods.
205 */
206 int (*add) (struct perf_event *event, int flags);
207 void (*del) (struct perf_event *event, int flags);
208
209 /*
210 * Starts/Stops a counter present on the PMU. The PMI handler
211 * should stop the counter when perf_event_overflow() returns
212 * !0. ->start() will be used to continue.
213 */
214 void (*start) (struct perf_event *event, int flags);
215 void (*stop) (struct perf_event *event, int flags);
216
217 /*
218 * Updates the counter value of the event.
219 */
cdd6c482 220 void (*read) (struct perf_event *event);
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221
222 /*
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223 * Group events scheduling is treated as a transaction, add
224 * group events as a whole and perform one schedulability test.
225 * If the test fails, roll back the whole group
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226 *
227 * Start the transaction, after this ->add() doesn't need to
24cd7f54 228 * do schedulability tests.
8d2cacbb 229 */
e7e7ee2e 230 void (*start_txn) (struct pmu *pmu); /* optional */
8d2cacbb 231 /*
a4eaf7f1 232 * If ->start_txn() disabled the ->add() schedulability test
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233 * then ->commit_txn() is required to perform one. On success
234 * the transaction is closed. On error the transaction is kept
235 * open until ->cancel_txn() is called.
236 */
e7e7ee2e 237 int (*commit_txn) (struct pmu *pmu); /* optional */
8d2cacbb 238 /*
a4eaf7f1 239 * Will cancel the transaction, assumes ->del() is called
25985edc 240 * for each successful ->add() during the transaction.
8d2cacbb 241 */
e7e7ee2e 242 void (*cancel_txn) (struct pmu *pmu); /* optional */
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243
244 /*
245 * Will return the value for perf_event_mmap_page::index for this event,
246 * if no implementation is provided it will default to: event->hw.idx + 1.
247 */
248 int (*event_idx) (struct perf_event *event); /*optional */
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249
250 /*
251 * flush branch stack on context-switches (needed in cpu-wide mode)
252 */
253 void (*flush_branch_stack) (void);
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254};
255
6a930700 256/**
cdd6c482 257 * enum perf_event_active_state - the states of a event
6a930700 258 */
cdd6c482 259enum perf_event_active_state {
57c0c15b 260 PERF_EVENT_STATE_ERROR = -2,
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261 PERF_EVENT_STATE_OFF = -1,
262 PERF_EVENT_STATE_INACTIVE = 0,
57c0c15b 263 PERF_EVENT_STATE_ACTIVE = 1,
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264};
265
9b51f66d 266struct file;
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267struct perf_sample_data;
268
a8b0ca17 269typedef void (*perf_overflow_handler_t)(struct perf_event *,
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270 struct perf_sample_data *,
271 struct pt_regs *regs);
272
d6f962b5 273enum perf_group_flag {
e7e7ee2e 274 PERF_GROUP_SOFTWARE = 0x1,
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275};
276
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277#define SWEVENT_HLIST_BITS 8
278#define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
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279
280struct swevent_hlist {
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281 struct hlist_head heads[SWEVENT_HLIST_SIZE];
282 struct rcu_head rcu_head;
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283};
284
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285#define PERF_ATTACH_CONTEXT 0x01
286#define PERF_ATTACH_GROUP 0x02
d580ff86 287#define PERF_ATTACH_TASK 0x04
8a49542c 288
877c6856 289struct perf_cgroup;
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290struct ring_buffer;
291
0793a61d 292/**
cdd6c482 293 * struct perf_event - performance event kernel representation:
0793a61d 294 */
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295struct perf_event {
296#ifdef CONFIG_PERF_EVENTS
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297 /*
298 * entry onto perf_event_context::event_list;
299 * modifications require ctx->lock
300 * RCU safe iterations.
301 */
592903cd 302 struct list_head event_entry;
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303
304 /*
305 * XXX: group_entry and sibling_list should be mutually exclusive;
306 * either you're a sibling on a group, or you're the group leader.
307 * Rework the code to always use the same list element.
308 *
309 * Locked for modification by both ctx->mutex and ctx->lock; holding
310 * either sufficies for read.
311 */
312 struct list_head group_entry;
04289bb9 313 struct list_head sibling_list;
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314
315 /*
316 * We need storage to track the entries in perf_pmu_migrate_context; we
317 * cannot use the event_entry because of RCU and we want to keep the
318 * group in tact which avoids us using the other two entries.
319 */
320 struct list_head migrate_entry;
321
76e1d904 322 struct hlist_node hlist_entry;
0127c3ea 323 int nr_siblings;
d6f962b5 324 int group_flags;
cdd6c482 325 struct perf_event *group_leader;
a4eaf7f1 326 struct pmu *pmu;
04289bb9 327
cdd6c482 328 enum perf_event_active_state state;
8a49542c 329 unsigned int attach_state;
e7850595 330 local64_t count;
a6e6dea6 331 atomic64_t child_count;
ee06094f 332
53cfbf59 333 /*
cdd6c482 334 * These are the total time in nanoseconds that the event
53cfbf59 335 * has been enabled (i.e. eligible to run, and the task has
cdd6c482 336 * been scheduled in, if this is a per-task event)
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337 * and running (scheduled onto the CPU), respectively.
338 *
339 * They are computed from tstamp_enabled, tstamp_running and
cdd6c482 340 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
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341 */
342 u64 total_time_enabled;
343 u64 total_time_running;
344
345 /*
346 * These are timestamps used for computing total_time_enabled
cdd6c482 347 * and total_time_running when the event is in INACTIVE or
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348 * ACTIVE state, measured in nanoseconds from an arbitrary point
349 * in time.
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350 * tstamp_enabled: the notional time when the event was enabled
351 * tstamp_running: the notional time when the event was scheduled on
53cfbf59 352 * tstamp_stopped: in INACTIVE state, the notional time when the
cdd6c482 353 * event was scheduled off.
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354 */
355 u64 tstamp_enabled;
356 u64 tstamp_running;
357 u64 tstamp_stopped;
358
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359 /*
360 * timestamp shadows the actual context timing but it can
361 * be safely used in NMI interrupt context. It reflects the
362 * context time as it was when the event was last scheduled in.
363 *
364 * ctx_time already accounts for ctx->timestamp. Therefore to
365 * compute ctx_time for a sample, simply add perf_clock().
366 */
367 u64 shadow_ctx_time;
368
24f1e32c 369 struct perf_event_attr attr;
c320c7b7 370 u16 header_size;
6844c09d 371 u16 id_header_size;
c320c7b7 372 u16 read_size;
cdd6c482 373 struct hw_perf_event hw;
0793a61d 374
cdd6c482 375 struct perf_event_context *ctx;
a6fa941d 376 atomic_long_t refcount;
0793a61d 377
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378 /*
379 * These accumulate total time (in nanoseconds) that children
cdd6c482 380 * events have been enabled and running, respectively.
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381 */
382 atomic64_t child_total_time_enabled;
383 atomic64_t child_total_time_running;
384
0793a61d 385 /*
d859e29f 386 * Protect attach/detach and child_list:
0793a61d 387 */
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388 struct mutex child_mutex;
389 struct list_head child_list;
cdd6c482 390 struct perf_event *parent;
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391
392 int oncpu;
393 int cpu;
394
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395 struct list_head owner_entry;
396 struct task_struct *owner;
397
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398 /* mmap bits */
399 struct mutex mmap_mutex;
400 atomic_t mmap_count;
26cb63ad 401
76369139 402 struct ring_buffer *rb;
10c6db11 403 struct list_head rb_entry;
37d81828 404
7b732a75 405 /* poll related */
0793a61d 406 wait_queue_head_t waitq;
3c446b3d 407 struct fasync_struct *fasync;
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408
409 /* delayed work for NMIs and such */
410 int pending_wakeup;
4c9e2542 411 int pending_kill;
79f14641 412 int pending_disable;
e360adbe 413 struct irq_work pending;
592903cd 414
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415 atomic_t event_limit;
416
cdd6c482 417 void (*destroy)(struct perf_event *);
592903cd 418 struct rcu_head rcu_head;
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419
420 struct pid_namespace *ns;
8e5799b1 421 u64 id;
6fb2915d 422
b326e956 423 perf_overflow_handler_t overflow_handler;
4dc0da86 424 void *overflow_handler_context;
453f19ee 425
07b139c8 426#ifdef CONFIG_EVENT_TRACING
1c024eca 427 struct ftrace_event_call *tp_event;
6fb2915d 428 struct event_filter *filter;
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429#ifdef CONFIG_FUNCTION_TRACER
430 struct ftrace_ops ftrace_ops;
431#endif
ee06094f 432#endif
6fb2915d 433
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434#ifdef CONFIG_CGROUP_PERF
435 struct perf_cgroup *cgrp; /* cgroup event is attach to */
436 int cgrp_defer_enabled;
437#endif
438
6fb2915d 439#endif /* CONFIG_PERF_EVENTS */
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440};
441
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442enum perf_event_context_type {
443 task_context,
444 cpu_context,
445};
446
0793a61d 447/**
cdd6c482 448 * struct perf_event_context - event context structure
0793a61d 449 *
cdd6c482 450 * Used as a container for task events and CPU events as well:
0793a61d 451 */
cdd6c482 452struct perf_event_context {
108b02cf 453 struct pmu *pmu;
ee643c41 454 enum perf_event_context_type type;
0793a61d 455 /*
cdd6c482 456 * Protect the states of the events in the list,
d859e29f 457 * nr_active, and the list:
0793a61d 458 */
e625cce1 459 raw_spinlock_t lock;
d859e29f 460 /*
cdd6c482 461 * Protect the list of events. Locking either mutex or lock
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462 * is sufficient to ensure the list doesn't change; to change
463 * the list you need to lock both the mutex and the spinlock.
464 */
a308444c 465 struct mutex mutex;
04289bb9 466
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467 struct list_head pinned_groups;
468 struct list_head flexible_groups;
a308444c 469 struct list_head event_list;
cdd6c482 470 int nr_events;
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471 int nr_active;
472 int is_active;
bfbd3381 473 int nr_stat;
0f5a2601 474 int nr_freq;
dddd3379 475 int rotate_disable;
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476 atomic_t refcount;
477 struct task_struct *task;
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478
479 /*
4af4998b 480 * Context clock, runs when context enabled.
53cfbf59 481 */
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482 u64 time;
483 u64 timestamp;
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484
485 /*
486 * These fields let us detect when two contexts have both
487 * been cloned (inherited) from a common ancestor.
488 */
cdd6c482 489 struct perf_event_context *parent_ctx;
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490 u64 parent_gen;
491 u64 generation;
492 int pin_count;
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493 int nr_cgroups; /* cgroup evts */
494 int nr_branch_stack; /* branch_stack evt */
28009ce4 495 struct rcu_head rcu_head;
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496};
497
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498/*
499 * Number of contexts where an event can trigger:
e7e7ee2e 500 * task, softirq, hardirq, nmi.
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501 */
502#define PERF_NR_CONTEXTS 4
503
0793a61d 504/**
cdd6c482 505 * struct perf_event_cpu_context - per cpu event context structure
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506 */
507struct perf_cpu_context {
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508 struct perf_event_context ctx;
509 struct perf_event_context *task_ctx;
0793a61d 510 int active_oncpu;
3b6f9e5c 511 int exclusive;
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512 struct hrtimer hrtimer;
513 ktime_t hrtimer_interval;
e9d2b064 514 struct list_head rotation_list;
3f1f3320 515 struct pmu *unique_pmu;
e5d1367f 516 struct perf_cgroup *cgrp;
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517};
518
5622f295 519struct perf_output_handle {
57c0c15b 520 struct perf_event *event;
76369139 521 struct ring_buffer *rb;
6d1acfd5 522 unsigned long wakeup;
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523 unsigned long size;
524 void *addr;
525 int page;
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526};
527
cdd6c482 528#ifdef CONFIG_PERF_EVENTS
829b42dd 529
03d8e80b 530extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
b0a873eb 531extern void perf_pmu_unregister(struct pmu *pmu);
621a01ea 532
3bf101ba 533extern int perf_num_counters(void);
84c79910 534extern const char *perf_pmu_name(void);
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535extern void __perf_event_task_sched_in(struct task_struct *prev,
536 struct task_struct *task);
537extern void __perf_event_task_sched_out(struct task_struct *prev,
538 struct task_struct *next);
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539extern int perf_event_init_task(struct task_struct *child);
540extern void perf_event_exit_task(struct task_struct *child);
541extern void perf_event_free_task(struct task_struct *task);
4e231c79 542extern void perf_event_delayed_put(struct task_struct *task);
cdd6c482 543extern void perf_event_print_debug(void);
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544extern void perf_pmu_disable(struct pmu *pmu);
545extern void perf_pmu_enable(struct pmu *pmu);
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546extern int perf_event_task_disable(void);
547extern int perf_event_task_enable(void);
26ca5c11 548extern int perf_event_refresh(struct perf_event *event, int refresh);
cdd6c482 549extern void perf_event_update_userpage(struct perf_event *event);
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550extern int perf_event_release_kernel(struct perf_event *event);
551extern struct perf_event *
552perf_event_create_kernel_counter(struct perf_event_attr *attr,
553 int cpu,
38a81da2 554 struct task_struct *task,
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555 perf_overflow_handler_t callback,
556 void *context);
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557extern void perf_pmu_migrate_context(struct pmu *pmu,
558 int src_cpu, int dst_cpu);
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559extern u64 perf_event_read_value(struct perf_event *event,
560 u64 *enabled, u64 *running);
5c92d124 561
d010b332 562
df1a132b 563struct perf_sample_data {
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564 u64 type;
565
566 u64 ip;
567 struct {
568 u32 pid;
569 u32 tid;
570 } tid_entry;
571 u64 time;
a308444c 572 u64 addr;
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573 u64 id;
574 u64 stream_id;
575 struct {
576 u32 cpu;
577 u32 reserved;
578 } cpu_entry;
a308444c 579 u64 period;
d6be9ad6 580 union perf_mem_data_src data_src;
5622f295 581 struct perf_callchain_entry *callchain;
3a43ce68 582 struct perf_raw_record *raw;
bce38cd5 583 struct perf_branch_stack *br_stack;
4018994f 584 struct perf_regs_user regs_user;
c5ebcedb 585 u64 stack_user_size;
c3feedf2 586 u64 weight;
df1a132b
PZ
587};
588
fd0d000b
RR
589static inline void perf_sample_data_init(struct perf_sample_data *data,
590 u64 addr, u64 period)
dc1d628a 591{
fd0d000b 592 /* remaining struct members initialized in perf_prepare_sample() */
dc1d628a
PZ
593 data->addr = addr;
594 data->raw = NULL;
bce38cd5 595 data->br_stack = NULL;
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JO
596 data->period = period;
597 data->regs_user.abi = PERF_SAMPLE_REGS_ABI_NONE;
598 data->regs_user.regs = NULL;
c5ebcedb 599 data->stack_user_size = 0;
c3feedf2 600 data->weight = 0;
d6be9ad6 601 data->data_src.val = 0;
dc1d628a
PZ
602}
603
5622f295
MM
604extern void perf_output_sample(struct perf_output_handle *handle,
605 struct perf_event_header *header,
606 struct perf_sample_data *data,
cdd6c482 607 struct perf_event *event);
5622f295
MM
608extern void perf_prepare_sample(struct perf_event_header *header,
609 struct perf_sample_data *data,
cdd6c482 610 struct perf_event *event,
5622f295
MM
611 struct pt_regs *regs);
612
a8b0ca17 613extern int perf_event_overflow(struct perf_event *event,
5622f295
MM
614 struct perf_sample_data *data,
615 struct pt_regs *regs);
df1a132b 616
6c7e550f
FBH
617static inline bool is_sampling_event(struct perf_event *event)
618{
619 return event->attr.sample_period != 0;
620}
621
3b6f9e5c 622/*
cdd6c482 623 * Return 1 for a software event, 0 for a hardware event
3b6f9e5c 624 */
cdd6c482 625static inline int is_software_event(struct perf_event *event)
3b6f9e5c 626{
89a1e187 627 return event->pmu->task_ctx_nr == perf_sw_context;
3b6f9e5c
PM
628}
629
c5905afb 630extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
f29ac756 631
a8b0ca17 632extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
f29ac756 633
b0f82b81 634#ifndef perf_arch_fetch_caller_regs
e7e7ee2e 635static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
b0f82b81 636#endif
5331d7b8
FW
637
638/*
639 * Take a snapshot of the regs. Skip ip and frame pointer to
640 * the nth caller. We only need a few of the regs:
641 * - ip for PERF_SAMPLE_IP
642 * - cs for user_mode() tests
643 * - bp for callchains
644 * - eflags, for future purposes, just in case
645 */
b0f82b81 646static inline void perf_fetch_caller_regs(struct pt_regs *regs)
5331d7b8 647{
5331d7b8
FW
648 memset(regs, 0, sizeof(*regs));
649
b0f82b81 650 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
5331d7b8
FW
651}
652
7e54a5a0 653static __always_inline void
a8b0ca17 654perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
e49a5bd3 655{
7e54a5a0
PZ
656 struct pt_regs hot_regs;
657
c5905afb 658 if (static_key_false(&perf_swevent_enabled[event_id])) {
d430d3d7
JB
659 if (!regs) {
660 perf_fetch_caller_regs(&hot_regs);
661 regs = &hot_regs;
662 }
a8b0ca17 663 __perf_sw_event(event_id, nr, regs, addr);
e49a5bd3
FW
664 }
665}
666
c5905afb 667extern struct static_key_deferred perf_sched_events;
ee6dcfa4 668
ab0cce56 669static inline void perf_event_task_sched_in(struct task_struct *prev,
a8d757ef 670 struct task_struct *task)
ab0cce56
JO
671{
672 if (static_key_false(&perf_sched_events.key))
673 __perf_event_task_sched_in(prev, task);
674}
675
676static inline void perf_event_task_sched_out(struct task_struct *prev,
677 struct task_struct *next)
ee6dcfa4 678{
a8b0ca17 679 perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0);
ee6dcfa4 680
c5905afb 681 if (static_key_false(&perf_sched_events.key))
ab0cce56 682 __perf_event_task_sched_out(prev, next);
ee6dcfa4
PZ
683}
684
3af9e859 685extern void perf_event_mmap(struct vm_area_struct *vma);
39447b38 686extern struct perf_guest_info_callbacks *perf_guest_cbs;
dcf46b94
ZY
687extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
688extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
39447b38 689
cdd6c482
IM
690extern void perf_event_comm(struct task_struct *tsk);
691extern void perf_event_fork(struct task_struct *tsk);
8d1b2d93 692
56962b44
FW
693/* Callchains */
694DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
695
e7e7ee2e
IM
696extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
697extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
394ee076 698
e7e7ee2e 699static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
70791ce9
FW
700{
701 if (entry->nr < PERF_MAX_STACK_DEPTH)
702 entry->ip[entry->nr++] = ip;
703}
394ee076 704
cdd6c482
IM
705extern int sysctl_perf_event_paranoid;
706extern int sysctl_perf_event_mlock;
707extern int sysctl_perf_event_sample_rate;
14c63f17
DH
708extern int sysctl_perf_cpu_time_max_percent;
709
710extern void perf_sample_event_took(u64 sample_len_ns);
1ccd1549 711
163ec435
PZ
712extern int perf_proc_update_handler(struct ctl_table *table, int write,
713 void __user *buffer, size_t *lenp,
714 loff_t *ppos);
14c63f17
DH
715extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
716 void __user *buffer, size_t *lenp,
717 loff_t *ppos);
718
163ec435 719
320ebf09
PZ
720static inline bool perf_paranoid_tracepoint_raw(void)
721{
722 return sysctl_perf_event_paranoid > -1;
723}
724
725static inline bool perf_paranoid_cpu(void)
726{
727 return sysctl_perf_event_paranoid > 0;
728}
729
730static inline bool perf_paranoid_kernel(void)
731{
732 return sysctl_perf_event_paranoid > 1;
733}
734
cdd6c482 735extern void perf_event_init(void);
1c024eca
PZ
736extern void perf_tp_event(u64 addr, u64 count, void *record,
737 int entry_size, struct pt_regs *regs,
e6dab5ff
AV
738 struct hlist_head *head, int rctx,
739 struct task_struct *task);
24f1e32c 740extern void perf_bp_event(struct perf_event *event, void *data);
0d905bca 741
9d23a90a 742#ifndef perf_misc_flags
e7e7ee2e
IM
743# define perf_misc_flags(regs) \
744 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
745# define perf_instruction_pointer(regs) instruction_pointer(regs)
9d23a90a
PM
746#endif
747
bce38cd5
SE
748static inline bool has_branch_stack(struct perf_event *event)
749{
750 return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
751}
752
5622f295 753extern int perf_output_begin(struct perf_output_handle *handle,
a7ac67ea 754 struct perf_event *event, unsigned int size);
5622f295 755extern void perf_output_end(struct perf_output_handle *handle);
91d7753a 756extern unsigned int perf_output_copy(struct perf_output_handle *handle,
5622f295 757 const void *buf, unsigned int len);
5685e0ff
JO
758extern unsigned int perf_output_skip(struct perf_output_handle *handle,
759 unsigned int len);
4ed7c92d
PZ
760extern int perf_swevent_get_recursion_context(void);
761extern void perf_swevent_put_recursion_context(int rctx);
ab573844 762extern u64 perf_swevent_set_period(struct perf_event *event);
44234adc
FW
763extern void perf_event_enable(struct perf_event *event);
764extern void perf_event_disable(struct perf_event *event);
500ad2d8 765extern int __perf_event_disable(void *info);
e9d2b064 766extern void perf_event_task_tick(void);
0793a61d
TG
767#else
768static inline void
ab0cce56
JO
769perf_event_task_sched_in(struct task_struct *prev,
770 struct task_struct *task) { }
771static inline void
772perf_event_task_sched_out(struct task_struct *prev,
773 struct task_struct *next) { }
cdd6c482
IM
774static inline int perf_event_init_task(struct task_struct *child) { return 0; }
775static inline void perf_event_exit_task(struct task_struct *child) { }
776static inline void perf_event_free_task(struct task_struct *task) { }
4e231c79 777static inline void perf_event_delayed_put(struct task_struct *task) { }
57c0c15b 778static inline void perf_event_print_debug(void) { }
57c0c15b
IM
779static inline int perf_event_task_disable(void) { return -EINVAL; }
780static inline int perf_event_task_enable(void) { return -EINVAL; }
26ca5c11
AK
781static inline int perf_event_refresh(struct perf_event *event, int refresh)
782{
783 return -EINVAL;
784}
15dbf27c 785
925d519a 786static inline void
a8b0ca17 787perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
24f1e32c 788static inline void
184f412c 789perf_bp_event(struct perf_event *event, void *data) { }
0a4a9391 790
39447b38 791static inline int perf_register_guest_info_callbacks
e7e7ee2e 792(struct perf_guest_info_callbacks *callbacks) { return 0; }
39447b38 793static inline int perf_unregister_guest_info_callbacks
e7e7ee2e 794(struct perf_guest_info_callbacks *callbacks) { return 0; }
39447b38 795
57c0c15b 796static inline void perf_event_mmap(struct vm_area_struct *vma) { }
cdd6c482
IM
797static inline void perf_event_comm(struct task_struct *tsk) { }
798static inline void perf_event_fork(struct task_struct *tsk) { }
799static inline void perf_event_init(void) { }
184f412c 800static inline int perf_swevent_get_recursion_context(void) { return -1; }
4ed7c92d 801static inline void perf_swevent_put_recursion_context(int rctx) { }
ab573844 802static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; }
44234adc
FW
803static inline void perf_event_enable(struct perf_event *event) { }
804static inline void perf_event_disable(struct perf_event *event) { }
500ad2d8 805static inline int __perf_event_disable(void *info) { return -1; }
e9d2b064 806static inline void perf_event_task_tick(void) { }
0793a61d
TG
807#endif
808
026249ef
FW
809#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
810extern bool perf_event_can_stop_tick(void);
811#else
812static inline bool perf_event_can_stop_tick(void) { return true; }
813#endif
814
6c4d3bc9
DR
815#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
816extern void perf_restore_debug_store(void);
817#else
1d9d8639 818static inline void perf_restore_debug_store(void) { }
0793a61d
TG
819#endif
820
e7e7ee2e 821#define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
5622f295 822
3f6da390 823/*
0a0fca9d 824 * This has to have a higher priority than migration_notifier in sched/core.c.
3f6da390 825 */
e7e7ee2e
IM
826#define perf_cpu_notifier(fn) \
827do { \
0db0628d 828 static struct notifier_block fn##_nb = \
e7e7ee2e 829 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
c13d38e4 830 unsigned long cpu = smp_processor_id(); \
6760bca9 831 unsigned long flags; \
e7e7ee2e 832 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
c13d38e4 833 (void *)(unsigned long)cpu); \
6760bca9 834 local_irq_save(flags); \
e7e7ee2e 835 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
c13d38e4 836 (void *)(unsigned long)cpu); \
6760bca9 837 local_irq_restore(flags); \
e7e7ee2e 838 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
c13d38e4 839 (void *)(unsigned long)cpu); \
e7e7ee2e 840 register_cpu_notifier(&fn##_nb); \
3f6da390
PZ
841} while (0)
842
641cc938 843
2663960c
SB
844struct perf_pmu_events_attr {
845 struct device_attribute attr;
846 u64 id;
3a54aaa0 847 const char *event_str;
2663960c
SB
848};
849
850#define PMU_EVENT_ATTR(_name, _var, _id, _show) \
851static struct perf_pmu_events_attr _var = { \
852 .attr = __ATTR(_name, 0444, _show, NULL), \
853 .id = _id, \
854};
855
641cc938
JO
856#define PMU_FORMAT_ATTR(_name, _format) \
857static ssize_t \
858_name##_show(struct device *dev, \
859 struct device_attribute *attr, \
860 char *page) \
861{ \
862 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
863 return sprintf(page, _format "\n"); \
864} \
865 \
866static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
867
cdd6c482 868#endif /* _LINUX_PERF_EVENT_H */