perf: Fix perf_event_comm() vs. exec() assumption
[linux-2.6-block.git] / include / linux / perf_event.h
CommitLineData
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
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322 struct hlist_node hlist_entry;
323 struct list_head active_entry;
0127c3ea 324 int nr_siblings;
d6f962b5 325 int group_flags;
cdd6c482 326 struct perf_event *group_leader;
a4eaf7f1 327 struct pmu *pmu;
04289bb9 328
cdd6c482 329 enum perf_event_active_state state;
8a49542c 330 unsigned int attach_state;
e7850595 331 local64_t count;
a6e6dea6 332 atomic64_t child_count;
ee06094f 333
53cfbf59 334 /*
cdd6c482 335 * These are the total time in nanoseconds that the event
53cfbf59 336 * has been enabled (i.e. eligible to run, and the task has
cdd6c482 337 * been scheduled in, if this is a per-task event)
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338 * and running (scheduled onto the CPU), respectively.
339 *
340 * They are computed from tstamp_enabled, tstamp_running and
cdd6c482 341 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
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342 */
343 u64 total_time_enabled;
344 u64 total_time_running;
345
346 /*
347 * These are timestamps used for computing total_time_enabled
cdd6c482 348 * and total_time_running when the event is in INACTIVE or
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349 * ACTIVE state, measured in nanoseconds from an arbitrary point
350 * in time.
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351 * tstamp_enabled: the notional time when the event was enabled
352 * tstamp_running: the notional time when the event was scheduled on
53cfbf59 353 * tstamp_stopped: in INACTIVE state, the notional time when the
cdd6c482 354 * event was scheduled off.
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355 */
356 u64 tstamp_enabled;
357 u64 tstamp_running;
358 u64 tstamp_stopped;
359
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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
24f1e32c 370 struct perf_event_attr attr;
c320c7b7 371 u16 header_size;
6844c09d 372 u16 id_header_size;
c320c7b7 373 u16 read_size;
cdd6c482 374 struct hw_perf_event hw;
0793a61d 375
cdd6c482 376 struct perf_event_context *ctx;
a6fa941d 377 atomic_long_t refcount;
0793a61d 378
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379 /*
380 * These accumulate total time (in nanoseconds) that children
cdd6c482 381 * events have been enabled and running, respectively.
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382 */
383 atomic64_t child_total_time_enabled;
384 atomic64_t child_total_time_running;
385
0793a61d 386 /*
d859e29f 387 * Protect attach/detach and child_list:
0793a61d 388 */
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389 struct mutex child_mutex;
390 struct list_head child_list;
cdd6c482 391 struct perf_event *parent;
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392
393 int oncpu;
394 int cpu;
395
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396 struct list_head owner_entry;
397 struct task_struct *owner;
398
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399 /* mmap bits */
400 struct mutex mmap_mutex;
401 atomic_t mmap_count;
26cb63ad 402
76369139 403 struct ring_buffer *rb;
10c6db11 404 struct list_head rb_entry;
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405 unsigned long rcu_batches;
406 int rcu_pending;
37d81828 407
7b732a75 408 /* poll related */
0793a61d 409 wait_queue_head_t waitq;
3c446b3d 410 struct fasync_struct *fasync;
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411
412 /* delayed work for NMIs and such */
413 int pending_wakeup;
4c9e2542 414 int pending_kill;
79f14641 415 int pending_disable;
e360adbe 416 struct irq_work pending;
592903cd 417
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418 atomic_t event_limit;
419
cdd6c482 420 void (*destroy)(struct perf_event *);
592903cd 421 struct rcu_head rcu_head;
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422
423 struct pid_namespace *ns;
8e5799b1 424 u64 id;
6fb2915d 425
b326e956 426 perf_overflow_handler_t overflow_handler;
4dc0da86 427 void *overflow_handler_context;
453f19ee 428
07b139c8 429#ifdef CONFIG_EVENT_TRACING
1c024eca 430 struct ftrace_event_call *tp_event;
6fb2915d 431 struct event_filter *filter;
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432#ifdef CONFIG_FUNCTION_TRACER
433 struct ftrace_ops ftrace_ops;
434#endif
ee06094f 435#endif
6fb2915d 436
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437#ifdef CONFIG_CGROUP_PERF
438 struct perf_cgroup *cgrp; /* cgroup event is attach to */
439 int cgrp_defer_enabled;
440#endif
441
6fb2915d 442#endif /* CONFIG_PERF_EVENTS */
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443};
444
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445enum perf_event_context_type {
446 task_context,
447 cpu_context,
448};
449
0793a61d 450/**
cdd6c482 451 * struct perf_event_context - event context structure
0793a61d 452 *
cdd6c482 453 * Used as a container for task events and CPU events as well:
0793a61d 454 */
cdd6c482 455struct perf_event_context {
108b02cf 456 struct pmu *pmu;
ee643c41 457 enum perf_event_context_type type;
0793a61d 458 /*
cdd6c482 459 * Protect the states of the events in the list,
d859e29f 460 * nr_active, and the list:
0793a61d 461 */
e625cce1 462 raw_spinlock_t lock;
d859e29f 463 /*
cdd6c482 464 * Protect the list of events. Locking either mutex or lock
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465 * is sufficient to ensure the list doesn't change; to change
466 * the list you need to lock both the mutex and the spinlock.
467 */
a308444c 468 struct mutex mutex;
04289bb9 469
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470 struct list_head pinned_groups;
471 struct list_head flexible_groups;
a308444c 472 struct list_head event_list;
cdd6c482 473 int nr_events;
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474 int nr_active;
475 int is_active;
bfbd3381 476 int nr_stat;
0f5a2601 477 int nr_freq;
dddd3379 478 int rotate_disable;
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479 atomic_t refcount;
480 struct task_struct *task;
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481
482 /*
4af4998b 483 * Context clock, runs when context enabled.
53cfbf59 484 */
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485 u64 time;
486 u64 timestamp;
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487
488 /*
489 * These fields let us detect when two contexts have both
490 * been cloned (inherited) from a common ancestor.
491 */
cdd6c482 492 struct perf_event_context *parent_ctx;
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493 u64 parent_gen;
494 u64 generation;
495 int pin_count;
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496 int nr_cgroups; /* cgroup evts */
497 int nr_branch_stack; /* branch_stack evt */
28009ce4 498 struct rcu_head rcu_head;
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499};
500
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501/*
502 * Number of contexts where an event can trigger:
e7e7ee2e 503 * task, softirq, hardirq, nmi.
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504 */
505#define PERF_NR_CONTEXTS 4
506
0793a61d 507/**
cdd6c482 508 * struct perf_event_cpu_context - per cpu event context structure
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509 */
510struct perf_cpu_context {
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511 struct perf_event_context ctx;
512 struct perf_event_context *task_ctx;
0793a61d 513 int active_oncpu;
3b6f9e5c 514 int exclusive;
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515 struct hrtimer hrtimer;
516 ktime_t hrtimer_interval;
e9d2b064 517 struct list_head rotation_list;
3f1f3320 518 struct pmu *unique_pmu;
e5d1367f 519 struct perf_cgroup *cgrp;
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520};
521
5622f295 522struct perf_output_handle {
57c0c15b 523 struct perf_event *event;
76369139 524 struct ring_buffer *rb;
6d1acfd5 525 unsigned long wakeup;
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526 unsigned long size;
527 void *addr;
528 int page;
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529};
530
cdd6c482 531#ifdef CONFIG_PERF_EVENTS
829b42dd 532
03d8e80b 533extern int perf_pmu_register(struct pmu *pmu, const char *name, int type);
b0a873eb 534extern void perf_pmu_unregister(struct pmu *pmu);
621a01ea 535
3bf101ba 536extern int perf_num_counters(void);
84c79910 537extern const char *perf_pmu_name(void);
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538extern void __perf_event_task_sched_in(struct task_struct *prev,
539 struct task_struct *task);
540extern void __perf_event_task_sched_out(struct task_struct *prev,
541 struct task_struct *next);
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542extern int perf_event_init_task(struct task_struct *child);
543extern void perf_event_exit_task(struct task_struct *child);
544extern void perf_event_free_task(struct task_struct *task);
4e231c79 545extern void perf_event_delayed_put(struct task_struct *task);
cdd6c482 546extern void perf_event_print_debug(void);
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547extern void perf_pmu_disable(struct pmu *pmu);
548extern void perf_pmu_enable(struct pmu *pmu);
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549extern int perf_event_task_disable(void);
550extern int perf_event_task_enable(void);
26ca5c11 551extern int perf_event_refresh(struct perf_event *event, int refresh);
cdd6c482 552extern void perf_event_update_userpage(struct perf_event *event);
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553extern int perf_event_release_kernel(struct perf_event *event);
554extern struct perf_event *
555perf_event_create_kernel_counter(struct perf_event_attr *attr,
556 int cpu,
38a81da2 557 struct task_struct *task,
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558 perf_overflow_handler_t callback,
559 void *context);
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560extern void perf_pmu_migrate_context(struct pmu *pmu,
561 int src_cpu, int dst_cpu);
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562extern u64 perf_event_read_value(struct perf_event *event,
563 u64 *enabled, u64 *running);
5c92d124 564
d010b332 565
df1a132b 566struct perf_sample_data {
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567 u64 type;
568
569 u64 ip;
570 struct {
571 u32 pid;
572 u32 tid;
573 } tid_entry;
574 u64 time;
a308444c 575 u64 addr;
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576 u64 id;
577 u64 stream_id;
578 struct {
579 u32 cpu;
580 u32 reserved;
581 } cpu_entry;
a308444c 582 u64 period;
d6be9ad6 583 union perf_mem_data_src data_src;
5622f295 584 struct perf_callchain_entry *callchain;
3a43ce68 585 struct perf_raw_record *raw;
bce38cd5 586 struct perf_branch_stack *br_stack;
4018994f 587 struct perf_regs_user regs_user;
c5ebcedb 588 u64 stack_user_size;
c3feedf2 589 u64 weight;
fdfbbd07
AK
590 /*
591 * Transaction flags for abort events:
592 */
593 u64 txn;
df1a132b
PZ
594};
595
fd0d000b
RR
596static inline void perf_sample_data_init(struct perf_sample_data *data,
597 u64 addr, u64 period)
dc1d628a 598{
fd0d000b 599 /* remaining struct members initialized in perf_prepare_sample() */
dc1d628a
PZ
600 data->addr = addr;
601 data->raw = NULL;
bce38cd5 602 data->br_stack = NULL;
4018994f
JO
603 data->period = period;
604 data->regs_user.abi = PERF_SAMPLE_REGS_ABI_NONE;
605 data->regs_user.regs = NULL;
c5ebcedb 606 data->stack_user_size = 0;
c3feedf2 607 data->weight = 0;
d6be9ad6 608 data->data_src.val = 0;
fdfbbd07 609 data->txn = 0;
dc1d628a
PZ
610}
611
5622f295
MM
612extern void perf_output_sample(struct perf_output_handle *handle,
613 struct perf_event_header *header,
614 struct perf_sample_data *data,
cdd6c482 615 struct perf_event *event);
5622f295
MM
616extern void perf_prepare_sample(struct perf_event_header *header,
617 struct perf_sample_data *data,
cdd6c482 618 struct perf_event *event,
5622f295
MM
619 struct pt_regs *regs);
620
a8b0ca17 621extern int perf_event_overflow(struct perf_event *event,
5622f295
MM
622 struct perf_sample_data *data,
623 struct pt_regs *regs);
df1a132b 624
6c7e550f
FBH
625static inline bool is_sampling_event(struct perf_event *event)
626{
627 return event->attr.sample_period != 0;
628}
629
3b6f9e5c 630/*
cdd6c482 631 * Return 1 for a software event, 0 for a hardware event
3b6f9e5c 632 */
cdd6c482 633static inline int is_software_event(struct perf_event *event)
3b6f9e5c 634{
89a1e187 635 return event->pmu->task_ctx_nr == perf_sw_context;
3b6f9e5c
PM
636}
637
c5905afb 638extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
f29ac756 639
a8b0ca17 640extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
f29ac756 641
b0f82b81 642#ifndef perf_arch_fetch_caller_regs
e7e7ee2e 643static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
b0f82b81 644#endif
5331d7b8
FW
645
646/*
647 * Take a snapshot of the regs. Skip ip and frame pointer to
648 * the nth caller. We only need a few of the regs:
649 * - ip for PERF_SAMPLE_IP
650 * - cs for user_mode() tests
651 * - bp for callchains
652 * - eflags, for future purposes, just in case
653 */
b0f82b81 654static inline void perf_fetch_caller_regs(struct pt_regs *regs)
5331d7b8 655{
5331d7b8
FW
656 memset(regs, 0, sizeof(*regs));
657
b0f82b81 658 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
5331d7b8
FW
659}
660
7e54a5a0 661static __always_inline void
a8b0ca17 662perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
e49a5bd3 663{
7e54a5a0
PZ
664 struct pt_regs hot_regs;
665
c5905afb 666 if (static_key_false(&perf_swevent_enabled[event_id])) {
d430d3d7
JB
667 if (!regs) {
668 perf_fetch_caller_regs(&hot_regs);
669 regs = &hot_regs;
670 }
a8b0ca17 671 __perf_sw_event(event_id, nr, regs, addr);
e49a5bd3
FW
672 }
673}
674
c5905afb 675extern struct static_key_deferred perf_sched_events;
ee6dcfa4 676
ab0cce56 677static inline void perf_event_task_sched_in(struct task_struct *prev,
a8d757ef 678 struct task_struct *task)
ab0cce56
JO
679{
680 if (static_key_false(&perf_sched_events.key))
681 __perf_event_task_sched_in(prev, task);
682}
683
684static inline void perf_event_task_sched_out(struct task_struct *prev,
685 struct task_struct *next)
ee6dcfa4 686{
a8b0ca17 687 perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0);
ee6dcfa4 688
c5905afb 689 if (static_key_false(&perf_sched_events.key))
ab0cce56 690 __perf_event_task_sched_out(prev, next);
ee6dcfa4
PZ
691}
692
3af9e859 693extern void perf_event_mmap(struct vm_area_struct *vma);
39447b38 694extern struct perf_guest_info_callbacks *perf_guest_cbs;
dcf46b94
ZY
695extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
696extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
39447b38 697
e041e328 698extern void perf_event_exec(void);
cdd6c482
IM
699extern void perf_event_comm(struct task_struct *tsk);
700extern void perf_event_fork(struct task_struct *tsk);
8d1b2d93 701
56962b44
FW
702/* Callchains */
703DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
704
e7e7ee2e
IM
705extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
706extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
394ee076 707
e7e7ee2e 708static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
70791ce9
FW
709{
710 if (entry->nr < PERF_MAX_STACK_DEPTH)
711 entry->ip[entry->nr++] = ip;
712}
394ee076 713
cdd6c482
IM
714extern int sysctl_perf_event_paranoid;
715extern int sysctl_perf_event_mlock;
716extern int sysctl_perf_event_sample_rate;
14c63f17
DH
717extern int sysctl_perf_cpu_time_max_percent;
718
719extern void perf_sample_event_took(u64 sample_len_ns);
1ccd1549 720
163ec435
PZ
721extern int perf_proc_update_handler(struct ctl_table *table, int write,
722 void __user *buffer, size_t *lenp,
723 loff_t *ppos);
14c63f17
DH
724extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write,
725 void __user *buffer, size_t *lenp,
726 loff_t *ppos);
727
163ec435 728
320ebf09
PZ
729static inline bool perf_paranoid_tracepoint_raw(void)
730{
731 return sysctl_perf_event_paranoid > -1;
732}
733
734static inline bool perf_paranoid_cpu(void)
735{
736 return sysctl_perf_event_paranoid > 0;
737}
738
739static inline bool perf_paranoid_kernel(void)
740{
741 return sysctl_perf_event_paranoid > 1;
742}
743
cdd6c482 744extern void perf_event_init(void);
1c024eca
PZ
745extern void perf_tp_event(u64 addr, u64 count, void *record,
746 int entry_size, struct pt_regs *regs,
e6dab5ff
AV
747 struct hlist_head *head, int rctx,
748 struct task_struct *task);
24f1e32c 749extern void perf_bp_event(struct perf_event *event, void *data);
0d905bca 750
9d23a90a 751#ifndef perf_misc_flags
e7e7ee2e
IM
752# define perf_misc_flags(regs) \
753 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
754# define perf_instruction_pointer(regs) instruction_pointer(regs)
9d23a90a
PM
755#endif
756
bce38cd5
SE
757static inline bool has_branch_stack(struct perf_event *event)
758{
759 return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK;
760}
761
5622f295 762extern int perf_output_begin(struct perf_output_handle *handle,
a7ac67ea 763 struct perf_event *event, unsigned int size);
5622f295 764extern void perf_output_end(struct perf_output_handle *handle);
91d7753a 765extern unsigned int perf_output_copy(struct perf_output_handle *handle,
5622f295 766 const void *buf, unsigned int len);
5685e0ff
JO
767extern unsigned int perf_output_skip(struct perf_output_handle *handle,
768 unsigned int len);
4ed7c92d
PZ
769extern int perf_swevent_get_recursion_context(void);
770extern void perf_swevent_put_recursion_context(int rctx);
ab573844 771extern u64 perf_swevent_set_period(struct perf_event *event);
44234adc
FW
772extern void perf_event_enable(struct perf_event *event);
773extern void perf_event_disable(struct perf_event *event);
500ad2d8 774extern int __perf_event_disable(void *info);
e9d2b064 775extern void perf_event_task_tick(void);
e041e328 776#else /* !CONFIG_PERF_EVENTS: */
0793a61d 777static inline void
ab0cce56
JO
778perf_event_task_sched_in(struct task_struct *prev,
779 struct task_struct *task) { }
780static inline void
781perf_event_task_sched_out(struct task_struct *prev,
782 struct task_struct *next) { }
cdd6c482
IM
783static inline int perf_event_init_task(struct task_struct *child) { return 0; }
784static inline void perf_event_exit_task(struct task_struct *child) { }
785static inline void perf_event_free_task(struct task_struct *task) { }
4e231c79 786static inline void perf_event_delayed_put(struct task_struct *task) { }
57c0c15b 787static inline void perf_event_print_debug(void) { }
57c0c15b
IM
788static inline int perf_event_task_disable(void) { return -EINVAL; }
789static inline int perf_event_task_enable(void) { return -EINVAL; }
26ca5c11
AK
790static inline int perf_event_refresh(struct perf_event *event, int refresh)
791{
792 return -EINVAL;
793}
15dbf27c 794
925d519a 795static inline void
a8b0ca17 796perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }
24f1e32c 797static inline void
184f412c 798perf_bp_event(struct perf_event *event, void *data) { }
0a4a9391 799
39447b38 800static inline int perf_register_guest_info_callbacks
e7e7ee2e 801(struct perf_guest_info_callbacks *callbacks) { return 0; }
39447b38 802static inline int perf_unregister_guest_info_callbacks
e7e7ee2e 803(struct perf_guest_info_callbacks *callbacks) { return 0; }
39447b38 804
57c0c15b 805static inline void perf_event_mmap(struct vm_area_struct *vma) { }
e041e328 806static inline void perf_event_exec(void) { }
cdd6c482
IM
807static inline void perf_event_comm(struct task_struct *tsk) { }
808static inline void perf_event_fork(struct task_struct *tsk) { }
809static inline void perf_event_init(void) { }
184f412c 810static inline int perf_swevent_get_recursion_context(void) { return -1; }
4ed7c92d 811static inline void perf_swevent_put_recursion_context(int rctx) { }
ab573844 812static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; }
44234adc
FW
813static inline void perf_event_enable(struct perf_event *event) { }
814static inline void perf_event_disable(struct perf_event *event) { }
500ad2d8 815static inline int __perf_event_disable(void *info) { return -1; }
e9d2b064 816static inline void perf_event_task_tick(void) { }
0793a61d
TG
817#endif
818
026249ef
FW
819#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_NO_HZ_FULL)
820extern bool perf_event_can_stop_tick(void);
821#else
822static inline bool perf_event_can_stop_tick(void) { return true; }
823#endif
824
6c4d3bc9
DR
825#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
826extern void perf_restore_debug_store(void);
827#else
1d9d8639 828static inline void perf_restore_debug_store(void) { }
0793a61d
TG
829#endif
830
e7e7ee2e 831#define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
5622f295 832
3f6da390 833/*
0a0fca9d 834 * This has to have a higher priority than migration_notifier in sched/core.c.
3f6da390 835 */
e7e7ee2e
IM
836#define perf_cpu_notifier(fn) \
837do { \
0db0628d 838 static struct notifier_block fn##_nb = \
e7e7ee2e 839 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
c13d38e4 840 unsigned long cpu = smp_processor_id(); \
6760bca9 841 unsigned long flags; \
f0bdb5e0
SB
842 \
843 cpu_notifier_register_begin(); \
e7e7ee2e 844 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
c13d38e4 845 (void *)(unsigned long)cpu); \
6760bca9 846 local_irq_save(flags); \
e7e7ee2e 847 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
c13d38e4 848 (void *)(unsigned long)cpu); \
6760bca9 849 local_irq_restore(flags); \
e7e7ee2e 850 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
c13d38e4 851 (void *)(unsigned long)cpu); \
f0bdb5e0
SB
852 __register_cpu_notifier(&fn##_nb); \
853 cpu_notifier_register_done(); \
3f6da390
PZ
854} while (0)
855
f0bdb5e0
SB
856/*
857 * Bare-bones version of perf_cpu_notifier(), which doesn't invoke the
858 * callback for already online CPUs.
859 */
860#define __perf_cpu_notifier(fn) \
861do { \
862 static struct notifier_block fn##_nb = \
863 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
864 \
865 __register_cpu_notifier(&fn##_nb); \
866} while (0)
641cc938 867
2663960c
SB
868struct perf_pmu_events_attr {
869 struct device_attribute attr;
870 u64 id;
3a54aaa0 871 const char *event_str;
2663960c
SB
872};
873
874#define PMU_EVENT_ATTR(_name, _var, _id, _show) \
875static struct perf_pmu_events_attr _var = { \
876 .attr = __ATTR(_name, 0444, _show, NULL), \
877 .id = _id, \
878};
879
641cc938
JO
880#define PMU_FORMAT_ATTR(_name, _format) \
881static ssize_t \
882_name##_show(struct device *dev, \
883 struct device_attribute *attr, \
884 char *page) \
885{ \
886 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
887 return sprintf(page, _format "\n"); \
888} \
889 \
890static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
891
cdd6c482 892#endif /* _LINUX_PERF_EVENT_H */