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#include <uapi/linux/bpf_perf_event.h> 19 20/* 21 * Kernel-internal data types and definitions: 22 */ 23 24#ifdef CONFIG_PERF_EVENTS 25# include <asm/perf_event.h> 26# include <asm/local64.h> 27#endif 28 29#define PERF_GUEST_ACTIVE 0x01 30#define PERF_GUEST_USER 0x02 31 32struct perf_guest_info_callbacks { 33 unsigned int (*state)(void); 34 unsigned long (*get_ip)(void); 35 unsigned int (*handle_intel_pt_intr)(void); 36}; 37 38#ifdef CONFIG_HAVE_HW_BREAKPOINT 39#include <linux/rhashtable-types.h> 40#include <asm/hw_breakpoint.h> 41#endif 42 43#include <linux/list.h> 44#include <linux/mutex.h> 45#include <linux/rculist.h> 46#include <linux/rcupdate.h> 47#include <linux/spinlock.h> 48#include <linux/hrtimer.h> 49#include <linux/fs.h> 50#include <linux/pid_namespace.h> 51#include <linux/workqueue.h> 52#include <linux/ftrace.h> 53#include <linux/cpu.h> 54#include <linux/irq_work.h> 55#include <linux/static_key.h> 56#include <linux/jump_label_ratelimit.h> 57#include <linux/atomic.h> 58#include <linux/sysfs.h> 59#include <linux/perf_regs.h> 60#include <linux/cgroup.h> 61#include <linux/refcount.h> 62#include <linux/security.h> 63#include <linux/static_call.h> 64#include <linux/lockdep.h> 65#include <asm/local.h> 66 67struct perf_callchain_entry { 68 __u64 nr; 69 __u64 ip[]; /* /proc/sys/kernel/perf_event_max_stack */ 70}; 71 72struct perf_callchain_entry_ctx { 73 struct perf_callchain_entry *entry; 74 u32 max_stack; 75 u32 nr; 76 short contexts; 77 bool contexts_maxed; 78}; 79 80typedef unsigned long (*perf_copy_f)(void *dst, const void *src, 81 unsigned long off, unsigned long len); 82 83struct perf_raw_frag { 84 union { 85 struct perf_raw_frag *next; 86 unsigned long pad; 87 }; 88 perf_copy_f copy; 89 void *data; 90 u32 size; 91} __packed; 92 93struct perf_raw_record { 94 struct perf_raw_frag frag; 95 u32 size; 96}; 97 98static __always_inline bool perf_raw_frag_last(const struct perf_raw_frag *frag) 99{ 100 return frag->pad < sizeof(u64); 101} 102 103/* 104 * branch stack layout: 105 * nr: number of taken branches stored in entries[] 106 * hw_idx: The low level index of raw branch records 107 * for the most recent branch. 108 * -1ULL means invalid/unknown. 109 * 110 * Note that nr can vary from sample to sample 111 * branches (to, from) are stored from most recent 112 * to least recent, i.e., entries[0] contains the most 113 * recent branch. 114 * The entries[] is an abstraction of raw branch records, 115 * which may not be stored in age order in HW, e.g. Intel LBR. 116 * The hw_idx is to expose the low level index of raw 117 * branch record for the most recent branch aka entries[0]. 118 * The hw_idx index is between -1 (unknown) and max depth, 119 * which can be retrieved in /sys/devices/cpu/caps/branches. 120 * For the architectures whose raw branch records are 121 * already stored in age order, the hw_idx should be 0. 122 */ 123struct perf_branch_stack { 124 __u64 nr; 125 __u64 hw_idx; 126 struct perf_branch_entry entries[]; 127}; 128 129struct task_struct; 130 131/* 132 * extra PMU register associated with an event 133 */ 134struct hw_perf_event_extra { 135 u64 config; /* register value */ 136 unsigned int reg; /* register address or index */ 137 int alloc; /* extra register already allocated */ 138 int idx; /* index in shared_regs->regs[] */ 139}; 140 141/** 142 * hw_perf_event::flag values 143 * 144 * PERF_EVENT_FLAG_ARCH bits are reserved for architecture-specific 145 * usage. 146 */ 147#define PERF_EVENT_FLAG_ARCH 0x000fffff 148#define PERF_EVENT_FLAG_USER_READ_CNT 0x80000000 149 150static_assert((PERF_EVENT_FLAG_USER_READ_CNT & PERF_EVENT_FLAG_ARCH) == 0); 151 152/** 153 * struct hw_perf_event - performance event hardware details: 154 */ 155struct hw_perf_event { 156#ifdef CONFIG_PERF_EVENTS 157 union { 158 struct { /* hardware */ 159 u64 config; 160 u64 last_tag; 161 unsigned long config_base; 162 unsigned long event_base; 163 int event_base_rdpmc; 164 int idx; 165 int last_cpu; 166 int flags; 167 168 struct hw_perf_event_extra extra_reg; 169 struct hw_perf_event_extra branch_reg; 170 }; 171 struct { /* software */ 172 struct hrtimer hrtimer; 173 }; 174 struct { /* tracepoint */ 175 /* for tp_event->class */ 176 struct list_head tp_list; 177 }; 178 struct { /* amd_power */ 179 u64 pwr_acc; 180 u64 ptsc; 181 }; 182#ifdef CONFIG_HAVE_HW_BREAKPOINT 183 struct { /* breakpoint */ 184 /* 185 * Crufty hack to avoid the chicken and egg 186 * problem hw_breakpoint has with context 187 * creation and event initalization. 188 */ 189 struct arch_hw_breakpoint info; 190 struct rhlist_head bp_list; 191 }; 192#endif 193 struct { /* amd_iommu */ 194 u8 iommu_bank; 195 u8 iommu_cntr; 196 u16 padding; 197 u64 conf; 198 u64 conf1; 199 }; 200 }; 201 /* 202 * If the event is a per task event, this will point to the task in 203 * question. See the comment in perf_event_alloc(). 204 */ 205 struct task_struct *target; 206 207 /* 208 * PMU would store hardware filter configuration 209 * here. 210 */ 211 void *addr_filters; 212 213 /* Last sync'ed generation of filters */ 214 unsigned long addr_filters_gen; 215 216/* 217 * hw_perf_event::state flags; used to track the PERF_EF_* state. 218 */ 219#define PERF_HES_STOPPED 0x01 /* the counter is stopped */ 220#define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */ 221#define PERF_HES_ARCH 0x04 222 223 int state; 224 225 /* 226 * The last observed hardware counter value, updated with a 227 * local64_cmpxchg() such that pmu::read() can be called nested. 228 */ 229 local64_t prev_count; 230 231 /* 232 * The period to start the next sample with. 233 */ 234 u64 sample_period; 235 236 union { 237 struct { /* Sampling */ 238 /* 239 * The period we started this sample with. 240 */ 241 u64 last_period; 242 243 /* 244 * However much is left of the current period; 245 * note that this is a full 64bit value and 246 * allows for generation of periods longer 247 * than hardware might allow. 248 */ 249 local64_t period_left; 250 }; 251 struct { /* Topdown events counting for context switch */ 252 u64 saved_metric; 253 u64 saved_slots; 254 }; 255 }; 256 257 /* 258 * State for throttling the event, see __perf_event_overflow() and 259 * perf_adjust_freq_unthr_context(). 260 */ 261 u64 interrupts_seq; 262 u64 interrupts; 263 264 /* 265 * State for freq target events, see __perf_event_overflow() and 266 * perf_adjust_freq_unthr_context(). 267 */ 268 u64 freq_time_stamp; 269 u64 freq_count_stamp; 270#endif 271}; 272 273struct perf_event; 274struct perf_event_pmu_context; 275 276/* 277 * Common implementation detail of pmu::{start,commit,cancel}_txn 278 */ 279#define PERF_PMU_TXN_ADD 0x1 /* txn to add/schedule event on PMU */ 280#define PERF_PMU_TXN_READ 0x2 /* txn to read event group from PMU */ 281 282/** 283 * pmu::capabilities flags 284 */ 285#define PERF_PMU_CAP_NO_INTERRUPT 0x0001 286#define PERF_PMU_CAP_NO_NMI 0x0002 287#define PERF_PMU_CAP_AUX_NO_SG 0x0004 288#define PERF_PMU_CAP_EXTENDED_REGS 0x0008 289#define PERF_PMU_CAP_EXCLUSIVE 0x0010 290#define PERF_PMU_CAP_ITRACE 0x0020 291#define PERF_PMU_CAP_NO_EXCLUDE 0x0040 292#define PERF_PMU_CAP_AUX_OUTPUT 0x0080 293#define PERF_PMU_CAP_EXTENDED_HW_TYPE 0x0100 294 295struct perf_output_handle; 296 297#define PMU_NULL_DEV ((void *)(~0UL)) 298 299/** 300 * struct pmu - generic performance monitoring unit 301 */ 302struct pmu { 303 struct list_head entry; 304 305 struct module *module; 306 struct device *dev; 307 struct device *parent; 308 const struct attribute_group **attr_groups; 309 const struct attribute_group **attr_update; 310 const char *name; 311 int type; 312 313 /* 314 * various common per-pmu feature flags 315 */ 316 int capabilities; 317 318 int __percpu *pmu_disable_count; 319 struct perf_cpu_pmu_context __percpu *cpu_pmu_context; 320 atomic_t exclusive_cnt; /* < 0: cpu; > 0: tsk */ 321 int task_ctx_nr; 322 int hrtimer_interval_ms; 323 324 /* number of address filters this PMU can do */ 325 unsigned int nr_addr_filters; 326 327 /* 328 * Fully disable/enable this PMU, can be used to protect from the PMI 329 * as well as for lazy/batch writing of the MSRs. 330 */ 331 void (*pmu_enable) (struct pmu *pmu); /* optional */ 332 void (*pmu_disable) (struct pmu *pmu); /* optional */ 333 334 /* 335 * Try and initialize the event for this PMU. 336 * 337 * Returns: 338 * -ENOENT -- @event is not for this PMU 339 * 340 * -ENODEV -- @event is for this PMU but PMU not present 341 * -EBUSY -- @event is for this PMU but PMU temporarily unavailable 342 * -EINVAL -- @event is for this PMU but @event is not valid 343 * -EOPNOTSUPP -- @event is for this PMU, @event is valid, but not supported 344 * -EACCES -- @event is for this PMU, @event is valid, but no privileges 345 * 346 * 0 -- @event is for this PMU and valid 347 * 348 * Other error return values are allowed. 349 */ 350 int (*event_init) (struct perf_event *event); 351 352 /* 353 * Notification that the event was mapped or unmapped. Called 354 * in the context of the mapping task. 355 */ 356 void (*event_mapped) (struct perf_event *event, struct mm_struct *mm); /* optional */ 357 void (*event_unmapped) (struct perf_event *event, struct mm_struct *mm); /* optional */ 358 359 /* 360 * Flags for ->add()/->del()/ ->start()/->stop(). There are 361 * matching hw_perf_event::state flags. 362 */ 363#define PERF_EF_START 0x01 /* start the counter when adding */ 364#define PERF_EF_RELOAD 0x02 /* reload the counter when starting */ 365#define PERF_EF_UPDATE 0x04 /* update the counter when stopping */ 366 367 /* 368 * Adds/Removes a counter to/from the PMU, can be done inside a 369 * transaction, see the ->*_txn() methods. 370 * 371 * The add/del callbacks will reserve all hardware resources required 372 * to service the event, this includes any counter constraint 373 * scheduling etc. 374 * 375 * Called with IRQs disabled and the PMU disabled on the CPU the event 376 * is on. 377 * 378 * ->add() called without PERF_EF_START should result in the same state 379 * as ->add() followed by ->stop(). 380 * 381 * ->del() must always PERF_EF_UPDATE stop an event. If it calls 382 * ->stop() that must deal with already being stopped without 383 * PERF_EF_UPDATE. 384 */ 385 int (*add) (struct perf_event *event, int flags); 386 void (*del) (struct perf_event *event, int flags); 387 388 /* 389 * Starts/Stops a counter present on the PMU. 390 * 391 * The PMI handler should stop the counter when perf_event_overflow() 392 * returns !0. ->start() will be used to continue. 393 * 394 * Also used to change the sample period. 395 * 396 * Called with IRQs disabled and the PMU disabled on the CPU the event 397 * is on -- will be called from NMI context with the PMU generates 398 * NMIs. 399 * 400 * ->stop() with PERF_EF_UPDATE will read the counter and update 401 * period/count values like ->read() would. 402 * 403 * ->start() with PERF_EF_RELOAD will reprogram the counter 404 * value, must be preceded by a ->stop() with PERF_EF_UPDATE. 405 */ 406 void (*start) (struct perf_event *event, int flags); 407 void (*stop) (struct perf_event *event, int flags); 408 409 /* 410 * Updates the counter value of the event. 411 * 412 * For sampling capable PMUs this will also update the software period 413 * hw_perf_event::period_left field. 414 */ 415 void (*read) (struct perf_event *event); 416 417 /* 418 * Group events scheduling is treated as a transaction, add 419 * group events as a whole and perform one schedulability test. 420 * If the test fails, roll back the whole group 421 * 422 * Start the transaction, after this ->add() doesn't need to 423 * do schedulability tests. 424 * 425 * Optional. 426 */ 427 void (*start_txn) (struct pmu *pmu, unsigned int txn_flags); 428 /* 429 * If ->start_txn() disabled the ->add() schedulability test 430 * then ->commit_txn() is required to perform one. On success 431 * the transaction is closed. On error the transaction is kept 432 * open until ->cancel_txn() is called. 433 * 434 * Optional. 435 */ 436 int (*commit_txn) (struct pmu *pmu); 437 /* 438 * Will cancel the transaction, assumes ->del() is called 439 * for each successful ->add() during the transaction. 440 * 441 * Optional. 442 */ 443 void (*cancel_txn) (struct pmu *pmu); 444 445 /* 446 * Will return the value for perf_event_mmap_page::index for this event, 447 * if no implementation is provided it will default to 0 (see 448 * perf_event_idx_default). 449 */ 450 int (*event_idx) (struct perf_event *event); /*optional */ 451 452 /* 453 * context-switches callback 454 */ 455 void (*sched_task) (struct perf_event_pmu_context *pmu_ctx, 456 bool sched_in); 457 458 /* 459 * Kmem cache of PMU specific data 460 */ 461 struct kmem_cache *task_ctx_cache; 462 463 /* 464 * PMU specific parts of task perf event context (i.e. ctx->task_ctx_data) 465 * can be synchronized using this function. See Intel LBR callstack support 466 * implementation and Perf core context switch handling callbacks for usage 467 * examples. 468 */ 469 void (*swap_task_ctx) (struct perf_event_pmu_context *prev_epc, 470 struct perf_event_pmu_context *next_epc); 471 /* optional */ 472 473 /* 474 * Set up pmu-private data structures for an AUX area 475 */ 476 void *(*setup_aux) (struct perf_event *event, void **pages, 477 int nr_pages, bool overwrite); 478 /* optional */ 479 480 /* 481 * Free pmu-private AUX data structures 482 */ 483 void (*free_aux) (void *aux); /* optional */ 484 485 /* 486 * Take a snapshot of the AUX buffer without touching the event 487 * state, so that preempting ->start()/->stop() callbacks does 488 * not interfere with their logic. Called in PMI context. 489 * 490 * Returns the size of AUX data copied to the output handle. 491 * 492 * Optional. 493 */ 494 long (*snapshot_aux) (struct perf_event *event, 495 struct perf_output_handle *handle, 496 unsigned long size); 497 498 /* 499 * Validate address range filters: make sure the HW supports the 500 * requested configuration and number of filters; return 0 if the 501 * supplied filters are valid, -errno otherwise. 502 * 503 * Runs in the context of the ioctl()ing process and is not serialized 504 * with the rest of the PMU callbacks. 505 */ 506 int (*addr_filters_validate) (struct list_head *filters); 507 /* optional */ 508 509 /* 510 * Synchronize address range filter configuration: 511 * translate hw-agnostic filters into hardware configuration in 512 * event::hw::addr_filters. 513 * 514 * Runs as a part of filter sync sequence that is done in ->start() 515 * callback by calling perf_event_addr_filters_sync(). 516 * 517 * May (and should) traverse event::addr_filters::list, for which its 518 * caller provides necessary serialization. 519 */ 520 void (*addr_filters_sync) (struct perf_event *event); 521 /* optional */ 522 523 /* 524 * Check if event can be used for aux_output purposes for 525 * events of this PMU. 526 * 527 * Runs from perf_event_open(). Should return 0 for "no match" 528 * or non-zero for "match". 529 */ 530 int (*aux_output_match) (struct perf_event *event); 531 /* optional */ 532 533 /* 534 * Skip programming this PMU on the given CPU. Typically needed for 535 * big.LITTLE things. 536 */ 537 bool (*filter) (struct pmu *pmu, int cpu); /* optional */ 538 539 /* 540 * Check period value for PERF_EVENT_IOC_PERIOD ioctl. 541 */ 542 int (*check_period) (struct perf_event *event, u64 value); /* optional */ 543}; 544 545enum perf_addr_filter_action_t { 546 PERF_ADDR_FILTER_ACTION_STOP = 0, 547 PERF_ADDR_FILTER_ACTION_START, 548 PERF_ADDR_FILTER_ACTION_FILTER, 549}; 550 551/** 552 * struct perf_addr_filter - address range filter definition 553 * @entry: event's filter list linkage 554 * @path: object file's path for file-based filters 555 * @offset: filter range offset 556 * @size: filter range size (size==0 means single address trigger) 557 * @action: filter/start/stop 558 * 559 * This is a hardware-agnostic filter configuration as specified by the user. 560 */ 561struct perf_addr_filter { 562 struct list_head entry; 563 struct path path; 564 unsigned long offset; 565 unsigned long size; 566 enum perf_addr_filter_action_t action; 567}; 568 569/** 570 * struct perf_addr_filters_head - container for address range filters 571 * @list: list of filters for this event 572 * @lock: spinlock that serializes accesses to the @list and event's 573 * (and its children's) filter generations. 574 * @nr_file_filters: number of file-based filters 575 * 576 * A child event will use parent's @list (and therefore @lock), so they are 577 * bundled together; see perf_event_addr_filters(). 578 */ 579struct perf_addr_filters_head { 580 struct list_head list; 581 raw_spinlock_t lock; 582 unsigned int nr_file_filters; 583}; 584 585struct perf_addr_filter_range { 586 unsigned long start; 587 unsigned long size; 588}; 589 590/** 591 * enum perf_event_state - the states of an event: 592 */ 593enum perf_event_state { 594 PERF_EVENT_STATE_DEAD = -4, 595 PERF_EVENT_STATE_EXIT = -3, 596 PERF_EVENT_STATE_ERROR = -2, 597 PERF_EVENT_STATE_OFF = -1, 598 PERF_EVENT_STATE_INACTIVE = 0, 599 PERF_EVENT_STATE_ACTIVE = 1, 600}; 601 602struct file; 603struct perf_sample_data; 604 605typedef void (*perf_overflow_handler_t)(struct perf_event *, 606 struct perf_sample_data *, 607 struct pt_regs *regs); 608 609/* 610 * Event capabilities. For event_caps and groups caps. 611 * 612 * PERF_EV_CAP_SOFTWARE: Is a software event. 613 * PERF_EV_CAP_READ_ACTIVE_PKG: A CPU event (or cgroup event) that can be read 614 * from any CPU in the package where it is active. 615 * PERF_EV_CAP_SIBLING: An event with this flag must be a group sibling and 616 * cannot be a group leader. If an event with this flag is detached from the 617 * group it is scheduled out and moved into an unrecoverable ERROR state. 618 */ 619#define PERF_EV_CAP_SOFTWARE BIT(0) 620#define PERF_EV_CAP_READ_ACTIVE_PKG BIT(1) 621#define PERF_EV_CAP_SIBLING BIT(2) 622 623#define SWEVENT_HLIST_BITS 8 624#define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS) 625 626struct swevent_hlist { 627 struct hlist_head heads[SWEVENT_HLIST_SIZE]; 628 struct rcu_head rcu_head; 629}; 630 631#define PERF_ATTACH_CONTEXT 0x01 632#define PERF_ATTACH_GROUP 0x02 633#define PERF_ATTACH_TASK 0x04 634#define PERF_ATTACH_TASK_DATA 0x08 635#define PERF_ATTACH_ITRACE 0x10 636#define PERF_ATTACH_SCHED_CB 0x20 637#define PERF_ATTACH_CHILD 0x40 638 639struct bpf_prog; 640struct perf_cgroup; 641struct perf_buffer; 642 643struct pmu_event_list { 644 raw_spinlock_t lock; 645 struct list_head list; 646}; 647 648/* 649 * event->sibling_list is modified whole holding both ctx->lock and ctx->mutex 650 * as such iteration must hold either lock. However, since ctx->lock is an IRQ 651 * safe lock, and is only held by the CPU doing the modification, having IRQs 652 * disabled is sufficient since it will hold-off the IPIs. 653 */ 654#ifdef CONFIG_PROVE_LOCKING 655#define lockdep_assert_event_ctx(event) \ 656 WARN_ON_ONCE(__lockdep_enabled && \ 657 (this_cpu_read(hardirqs_enabled) && \ 658 lockdep_is_held(&(event)->ctx->mutex) != LOCK_STATE_HELD)) 659#else 660#define lockdep_assert_event_ctx(event) 661#endif 662 663#define for_each_sibling_event(sibling, event) \ 664 lockdep_assert_event_ctx(event); \ 665 if ((event)->group_leader == (event)) \ 666 list_for_each_entry((sibling), &(event)->sibling_list, sibling_list) 667 668/** 669 * struct perf_event - performance event kernel representation: 670 */ 671struct perf_event { 672#ifdef CONFIG_PERF_EVENTS 673 /* 674 * entry onto perf_event_context::event_list; 675 * modifications require ctx->lock 676 * RCU safe iterations. 677 */ 678 struct list_head event_entry; 679 680 /* 681 * Locked for modification by both ctx->mutex and ctx->lock; holding 682 * either sufficies for read. 683 */ 684 struct list_head sibling_list; 685 struct list_head active_list; 686 /* 687 * Node on the pinned or flexible tree located at the event context; 688 */ 689 struct rb_node group_node; 690 u64 group_index; 691 /* 692 * We need storage to track the entries in perf_pmu_migrate_context; we 693 * cannot use the event_entry because of RCU and we want to keep the 694 * group in tact which avoids us using the other two entries. 695 */ 696 struct list_head migrate_entry; 697 698 struct hlist_node hlist_entry; 699 struct list_head active_entry; 700 int nr_siblings; 701 702 /* Not serialized. Only written during event initialization. */ 703 int event_caps; 704 /* The cumulative AND of all event_caps for events in this group. */ 705 int group_caps; 706 707 unsigned int group_generation; 708 struct perf_event *group_leader; 709 /* 710 * event->pmu will always point to pmu in which this event belongs. 711 * Whereas event->pmu_ctx->pmu may point to other pmu when group of 712 * different pmu events is created. 713 */ 714 struct pmu *pmu; 715 void *pmu_private; 716 717 enum perf_event_state state; 718 unsigned int attach_state; 719 local64_t count; 720 atomic64_t child_count; 721 722 /* 723 * These are the total time in nanoseconds that the event 724 * has been enabled (i.e. eligible to run, and the task has 725 * been scheduled in, if this is a per-task event) 726 * and running (scheduled onto the CPU), respectively. 727 */ 728 u64 total_time_enabled; 729 u64 total_time_running; 730 u64 tstamp; 731 732 struct perf_event_attr attr; 733 u16 header_size; 734 u16 id_header_size; 735 u16 read_size; 736 struct hw_perf_event hw; 737 738 struct perf_event_context *ctx; 739 /* 740 * event->pmu_ctx points to perf_event_pmu_context in which the event 741 * is added. This pmu_ctx can be of other pmu for sw event when that 742 * sw event is part of a group which also contains non-sw events. 743 */ 744 struct perf_event_pmu_context *pmu_ctx; 745 atomic_long_t refcount; 746 747 /* 748 * These accumulate total time (in nanoseconds) that children 749 * events have been enabled and running, respectively. 750 */ 751 atomic64_t child_total_time_enabled; 752 atomic64_t child_total_time_running; 753 754 /* 755 * Protect attach/detach and child_list: 756 */ 757 struct mutex child_mutex; 758 struct list_head child_list; 759 struct perf_event *parent; 760 761 int oncpu; 762 int cpu; 763 764 struct list_head owner_entry; 765 struct task_struct *owner; 766 767 /* mmap bits */ 768 struct mutex mmap_mutex; 769 atomic_t mmap_count; 770 771 struct perf_buffer *rb; 772 struct list_head rb_entry; 773 unsigned long rcu_batches; 774 int rcu_pending; 775 776 /* poll related */ 777 wait_queue_head_t waitq; 778 struct fasync_struct *fasync; 779 780 /* delayed work for NMIs and such */ 781 unsigned int pending_wakeup; 782 unsigned int pending_kill; 783 unsigned int pending_disable; 784 unsigned int pending_sigtrap; 785 unsigned long pending_addr; /* SIGTRAP */ 786 struct irq_work pending_irq; 787 struct callback_head pending_task; 788 unsigned int pending_work; 789 790 atomic_t event_limit; 791 792 /* address range filters */ 793 struct perf_addr_filters_head addr_filters; 794 /* vma address array for file-based filders */ 795 struct perf_addr_filter_range *addr_filter_ranges; 796 unsigned long addr_filters_gen; 797 798 /* for aux_output events */ 799 struct perf_event *aux_event; 800 801 void (*destroy)(struct perf_event *); 802 struct rcu_head rcu_head; 803 804 struct pid_namespace *ns; 805 u64 id; 806 807 atomic64_t lost_samples; 808 809 u64 (*clock)(void); 810 perf_overflow_handler_t overflow_handler; 811 void *overflow_handler_context; 812#ifdef CONFIG_BPF_SYSCALL 813 perf_overflow_handler_t orig_overflow_handler; 814 struct bpf_prog *prog; 815 u64 bpf_cookie; 816#endif 817 818#ifdef CONFIG_EVENT_TRACING 819 struct trace_event_call *tp_event; 820 struct event_filter *filter; 821#ifdef CONFIG_FUNCTION_TRACER 822 struct ftrace_ops ftrace_ops; 823#endif 824#endif 825 826#ifdef CONFIG_CGROUP_PERF 827 struct perf_cgroup *cgrp; /* cgroup event is attach to */ 828#endif 829 830#ifdef CONFIG_SECURITY 831 void *security; 832#endif 833 struct list_head sb_list; 834 835 /* 836 * Certain events gets forwarded to another pmu internally by over- 837 * writing kernel copy of event->attr.type without user being aware 838 * of it. event->orig_type contains original 'type' requested by 839 * user. 840 */ 841 __u32 orig_type; 842#endif /* CONFIG_PERF_EVENTS */ 843}; 844 845/* 846 * ,-----------------------[1:n]------------------------. 847 * V V 848 * perf_event_context <-[1:n]-> perf_event_pmu_context <-[1:n]- perf_event 849 * | | 850 * `--[n:1]-> pmu <-[1:n]--' 851 * 852 * 853 * struct perf_event_pmu_context lifetime is refcount based and RCU freed 854 * (similar to perf_event_context). Locking is as if it were a member of 855 * perf_event_context; specifically: 856 * 857 * modification, both: ctx->mutex && ctx->lock 858 * reading, either: ctx->mutex || ctx->lock 859 * 860 * There is one exception to this; namely put_pmu_ctx() isn't always called 861 * with ctx->mutex held; this means that as long as we can guarantee the epc 862 * has events the above rules hold. 863 * 864 * Specificially, sys_perf_event_open()'s group_leader case depends on 865 * ctx->mutex pinning the configuration. Since we hold a reference on 866 * group_leader (through the filedesc) it can't go away, therefore it's 867 * associated pmu_ctx must exist and cannot change due to ctx->mutex. 868 * 869 * perf_event holds a refcount on perf_event_context 870 * perf_event holds a refcount on perf_event_pmu_context 871 */ 872struct perf_event_pmu_context { 873 struct pmu *pmu; 874 struct perf_event_context *ctx; 875 876 struct list_head pmu_ctx_entry; 877 878 struct list_head pinned_active; 879 struct list_head flexible_active; 880 881 /* Used to avoid freeing per-cpu perf_event_pmu_context */ 882 unsigned int embedded : 1; 883 884 unsigned int nr_events; 885 unsigned int nr_cgroups; 886 887 atomic_t refcount; /* event <-> epc */ 888 struct rcu_head rcu_head; 889 890 void *task_ctx_data; /* pmu specific data */ 891 /* 892 * Set when one or more (plausibly active) event can't be scheduled 893 * due to pmu overcommit or pmu constraints, except tolerant to 894 * events not necessary to be active due to scheduling constraints, 895 * such as cgroups. 896 */ 897 int rotate_necessary; 898}; 899 900struct perf_event_groups { 901 struct rb_root tree; 902 u64 index; 903}; 904 905 906/** 907 * struct perf_event_context - event context structure 908 * 909 * Used as a container for task events and CPU events as well: 910 */ 911struct perf_event_context { 912 /* 913 * Protect the states of the events in the list, 914 * nr_active, and the list: 915 */ 916 raw_spinlock_t lock; 917 /* 918 * Protect the list of events. Locking either mutex or lock 919 * is sufficient to ensure the list doesn't change; to change 920 * the list you need to lock both the mutex and the spinlock. 921 */ 922 struct mutex mutex; 923 924 struct list_head pmu_ctx_list; 925 struct perf_event_groups pinned_groups; 926 struct perf_event_groups flexible_groups; 927 struct list_head event_list; 928 929 int nr_events; 930 int nr_user; 931 int is_active; 932 933 int nr_task_data; 934 int nr_stat; 935 int nr_freq; 936 int rotate_disable; 937 938 refcount_t refcount; /* event <-> ctx */ 939 struct task_struct *task; 940 941 /* 942 * Context clock, runs when context enabled. 943 */ 944 u64 time; 945 u64 timestamp; 946 u64 timeoffset; 947 948 /* 949 * These fields let us detect when two contexts have both 950 * been cloned (inherited) from a common ancestor. 951 */ 952 struct perf_event_context *parent_ctx; 953 u64 parent_gen; 954 u64 generation; 955 int pin_count; 956#ifdef CONFIG_CGROUP_PERF 957 int nr_cgroups; /* cgroup evts */ 958#endif 959 struct rcu_head rcu_head; 960 961 /* 962 * Sum (event->pending_sigtrap + event->pending_work) 963 * 964 * The SIGTRAP is targeted at ctx->task, as such it won't do changing 965 * that until the signal is delivered. 966 */ 967 local_t nr_pending; 968}; 969 970/* 971 * Number of contexts where an event can trigger: 972 * task, softirq, hardirq, nmi. 973 */ 974#define PERF_NR_CONTEXTS 4 975 976struct perf_cpu_pmu_context { 977 struct perf_event_pmu_context epc; 978 struct perf_event_pmu_context *task_epc; 979 980 struct list_head sched_cb_entry; 981 int sched_cb_usage; 982 983 int active_oncpu; 984 int exclusive; 985 986 raw_spinlock_t hrtimer_lock; 987 struct hrtimer hrtimer; 988 ktime_t hrtimer_interval; 989 unsigned int hrtimer_active; 990}; 991 992/** 993 * struct perf_event_cpu_context - per cpu event context structure 994 */ 995struct perf_cpu_context { 996 struct perf_event_context ctx; 997 struct perf_event_context *task_ctx; 998 int online; 999 1000#ifdef CONFIG_CGROUP_PERF 1001 struct perf_cgroup *cgrp; 1002#endif 1003 1004 /* 1005 * Per-CPU storage for iterators used in visit_groups_merge. The default 1006 * storage is of size 2 to hold the CPU and any CPU event iterators. 1007 */ 1008 int heap_size; 1009 struct perf_event **heap; 1010 struct perf_event *heap_default[2]; 1011}; 1012 1013struct perf_output_handle { 1014 struct perf_event *event; 1015 struct perf_buffer *rb; 1016 unsigned long wakeup; 1017 unsigned long size; 1018 u64 aux_flags; 1019 union { 1020 void *addr; 1021 unsigned long head; 1022 }; 1023 int page; 1024}; 1025 1026struct bpf_perf_event_data_kern { 1027 bpf_user_pt_regs_t *regs; 1028 struct perf_sample_data *data; 1029 struct perf_event *event; 1030}; 1031 1032#ifdef CONFIG_CGROUP_PERF 1033 1034/* 1035 * perf_cgroup_info keeps track of time_enabled for a cgroup. 1036 * This is a per-cpu dynamically allocated data structure. 1037 */ 1038struct perf_cgroup_info { 1039 u64 time; 1040 u64 timestamp; 1041 u64 timeoffset; 1042 int active; 1043}; 1044 1045struct perf_cgroup { 1046 struct cgroup_subsys_state css; 1047 struct perf_cgroup_info __percpu *info; 1048}; 1049 1050/* 1051 * Must ensure cgroup is pinned (css_get) before calling 1052 * this function. In other words, we cannot call this function 1053 * if there is no cgroup event for the current CPU context. 1054 */ 1055static inline struct perf_cgroup * 1056perf_cgroup_from_task(struct task_struct *task, struct perf_event_context *ctx) 1057{ 1058 return container_of(task_css_check(task, perf_event_cgrp_id, 1059 ctx ? lockdep_is_held(&ctx->lock) 1060 : true), 1061 struct perf_cgroup, css); 1062} 1063#endif /* CONFIG_CGROUP_PERF */ 1064 1065#ifdef CONFIG_PERF_EVENTS 1066 1067extern struct perf_event_context *perf_cpu_task_ctx(void); 1068 1069extern void *perf_aux_output_begin(struct perf_output_handle *handle, 1070 struct perf_event *event); 1071extern void perf_aux_output_end(struct perf_output_handle *handle, 1072 unsigned long size); 1073extern int perf_aux_output_skip(struct perf_output_handle *handle, 1074 unsigned long size); 1075extern void *perf_get_aux(struct perf_output_handle *handle); 1076extern void perf_aux_output_flag(struct perf_output_handle *handle, u64 flags); 1077extern void perf_event_itrace_started(struct perf_event *event); 1078 1079extern int perf_pmu_register(struct pmu *pmu, const char *name, int type); 1080extern void perf_pmu_unregister(struct pmu *pmu); 1081 1082extern void __perf_event_task_sched_in(struct task_struct *prev, 1083 struct task_struct *task); 1084extern void __perf_event_task_sched_out(struct task_struct *prev, 1085 struct task_struct *next); 1086extern int perf_event_init_task(struct task_struct *child, u64 clone_flags); 1087extern void perf_event_exit_task(struct task_struct *child); 1088extern void perf_event_free_task(struct task_struct *task); 1089extern void perf_event_delayed_put(struct task_struct *task); 1090extern struct file *perf_event_get(unsigned int fd); 1091extern const struct perf_event *perf_get_event(struct file *file); 1092extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event); 1093extern void perf_event_print_debug(void); 1094extern void perf_pmu_disable(struct pmu *pmu); 1095extern void perf_pmu_enable(struct pmu *pmu); 1096extern void perf_sched_cb_dec(struct pmu *pmu); 1097extern void perf_sched_cb_inc(struct pmu *pmu); 1098extern int perf_event_task_disable(void); 1099extern int perf_event_task_enable(void); 1100 1101extern void perf_pmu_resched(struct pmu *pmu); 1102 1103extern int perf_event_refresh(struct perf_event *event, int refresh); 1104extern void perf_event_update_userpage(struct perf_event *event); 1105extern int perf_event_release_kernel(struct perf_event *event); 1106extern struct perf_event * 1107perf_event_create_kernel_counter(struct perf_event_attr *attr, 1108 int cpu, 1109 struct task_struct *task, 1110 perf_overflow_handler_t callback, 1111 void *context); 1112extern void perf_pmu_migrate_context(struct pmu *pmu, 1113 int src_cpu, int dst_cpu); 1114int perf_event_read_local(struct perf_event *event, u64 *value, 1115 u64 *enabled, u64 *running); 1116extern u64 perf_event_read_value(struct perf_event *event, 1117 u64 *enabled, u64 *running); 1118 1119extern struct perf_callchain_entry *perf_callchain(struct perf_event *event, struct pt_regs *regs); 1120 1121static inline bool branch_sample_no_flags(const struct perf_event *event) 1122{ 1123 return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_NO_FLAGS; 1124} 1125 1126static inline bool branch_sample_no_cycles(const struct perf_event *event) 1127{ 1128 return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_NO_CYCLES; 1129} 1130 1131static inline bool branch_sample_type(const struct perf_event *event) 1132{ 1133 return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_TYPE_SAVE; 1134} 1135 1136static inline bool branch_sample_hw_index(const struct perf_event *event) 1137{ 1138 return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX; 1139} 1140 1141static inline bool branch_sample_priv(const struct perf_event *event) 1142{ 1143 return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_PRIV_SAVE; 1144} 1145 1146static inline bool branch_sample_counters(const struct perf_event *event) 1147{ 1148 return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS; 1149} 1150 1151static inline bool branch_sample_call_stack(const struct perf_event *event) 1152{ 1153 return event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_CALL_STACK; 1154} 1155 1156struct perf_sample_data { 1157 /* 1158 * Fields set by perf_sample_data_init() unconditionally, 1159 * group so as to minimize the cachelines touched. 1160 */ 1161 u64 sample_flags; 1162 u64 period; 1163 u64 dyn_size; 1164 1165 /* 1166 * Fields commonly set by __perf_event_header__init_id(), 1167 * group so as to minimize the cachelines touched. 1168 */ 1169 u64 type; 1170 struct { 1171 u32 pid; 1172 u32 tid; 1173 } tid_entry; 1174 u64 time; 1175 u64 id; 1176 struct { 1177 u32 cpu; 1178 u32 reserved; 1179 } cpu_entry; 1180 1181 /* 1182 * The other fields, optionally {set,used} by 1183 * perf_{prepare,output}_sample(). 1184 */ 1185 u64 ip; 1186 struct perf_callchain_entry *callchain; 1187 struct perf_raw_record *raw; 1188 struct perf_branch_stack *br_stack; 1189 u64 *br_stack_cntr; 1190 union perf_sample_weight weight; 1191 union perf_mem_data_src data_src; 1192 u64 txn; 1193 1194 struct perf_regs regs_user; 1195 struct perf_regs regs_intr; 1196 u64 stack_user_size; 1197 1198 u64 stream_id; 1199 u64 cgroup; 1200 u64 addr; 1201 u64 phys_addr; 1202 u64 data_page_size; 1203 u64 code_page_size; 1204 u64 aux_size; 1205} ____cacheline_aligned; 1206 1207/* default value for data source */ 1208#define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\ 1209 PERF_MEM_S(LVL, NA) |\ 1210 PERF_MEM_S(SNOOP, NA) |\ 1211 PERF_MEM_S(LOCK, NA) |\ 1212 PERF_MEM_S(TLB, NA) |\ 1213 PERF_MEM_S(LVLNUM, NA)) 1214 1215static inline void perf_sample_data_init(struct perf_sample_data *data, 1216 u64 addr, u64 period) 1217{ 1218 /* remaining struct members initialized in perf_prepare_sample() */ 1219 data->sample_flags = PERF_SAMPLE_PERIOD; 1220 data->period = period; 1221 data->dyn_size = 0; 1222 1223 if (addr) { 1224 data->addr = addr; 1225 data->sample_flags |= PERF_SAMPLE_ADDR; 1226 } 1227} 1228 1229static inline void perf_sample_save_callchain(struct perf_sample_data *data, 1230 struct perf_event *event, 1231 struct pt_regs *regs) 1232{ 1233 int size = 1; 1234 1235 data->callchain = perf_callchain(event, regs); 1236 size += data->callchain->nr; 1237 1238 data->dyn_size += size * sizeof(u64); 1239 data->sample_flags |= PERF_SAMPLE_CALLCHAIN; 1240} 1241 1242static inline void perf_sample_save_raw_data(struct perf_sample_data *data, 1243 struct perf_raw_record *raw) 1244{ 1245 struct perf_raw_frag *frag = &raw->frag; 1246 u32 sum = 0; 1247 int size; 1248 1249 do { 1250 sum += frag->size; 1251 if (perf_raw_frag_last(frag)) 1252 break; 1253 frag = frag->next; 1254 } while (1); 1255 1256 size = round_up(sum + sizeof(u32), sizeof(u64)); 1257 raw->size = size - sizeof(u32); 1258 frag->pad = raw->size - sum; 1259 1260 data->raw = raw; 1261 data->dyn_size += size; 1262 data->sample_flags |= PERF_SAMPLE_RAW; 1263} 1264 1265static inline void perf_sample_save_brstack(struct perf_sample_data *data, 1266 struct perf_event *event, 1267 struct perf_branch_stack *brs, 1268 u64 *brs_cntr) 1269{ 1270 int size = sizeof(u64); /* nr */ 1271 1272 if (branch_sample_hw_index(event)) 1273 size += sizeof(u64); 1274 size += brs->nr * sizeof(struct perf_branch_entry); 1275 1276 /* 1277 * The extension space for counters is appended after the 1278 * struct perf_branch_stack. It is used to store the occurrences 1279 * of events of each branch. 1280 */ 1281 if (brs_cntr) 1282 size += brs->nr * sizeof(u64); 1283 1284 data->br_stack = brs; 1285 data->br_stack_cntr = brs_cntr; 1286 data->dyn_size += size; 1287 data->sample_flags |= PERF_SAMPLE_BRANCH_STACK; 1288} 1289 1290static inline u32 perf_sample_data_size(struct perf_sample_data *data, 1291 struct perf_event *event) 1292{ 1293 u32 size = sizeof(struct perf_event_header); 1294 1295 size += event->header_size + event->id_header_size; 1296 size += data->dyn_size; 1297 1298 return size; 1299} 1300 1301/* 1302 * Clear all bitfields in the perf_branch_entry. 1303 * The to and from fields are not cleared because they are 1304 * systematically modified by caller. 1305 */ 1306static inline void perf_clear_branch_entry_bitfields(struct perf_branch_entry *br) 1307{ 1308 br->mispred = 0; 1309 br->predicted = 0; 1310 br->in_tx = 0; 1311 br->abort = 0; 1312 br->cycles = 0; 1313 br->type = 0; 1314 br->spec = PERF_BR_SPEC_NA; 1315 br->reserved = 0; 1316} 1317 1318extern void perf_output_sample(struct perf_output_handle *handle, 1319 struct perf_event_header *header, 1320 struct perf_sample_data *data, 1321 struct perf_event *event); 1322extern void perf_prepare_sample(struct perf_sample_data *data, 1323 struct perf_event *event, 1324 struct pt_regs *regs); 1325extern void perf_prepare_header(struct perf_event_header *header, 1326 struct perf_sample_data *data, 1327 struct perf_event *event, 1328 struct pt_regs *regs); 1329 1330extern int perf_event_overflow(struct perf_event *event, 1331 struct perf_sample_data *data, 1332 struct pt_regs *regs); 1333 1334extern void perf_event_output_forward(struct perf_event *event, 1335 struct perf_sample_data *data, 1336 struct pt_regs *regs); 1337extern void perf_event_output_backward(struct perf_event *event, 1338 struct perf_sample_data *data, 1339 struct pt_regs *regs); 1340extern int perf_event_output(struct perf_event *event, 1341 struct perf_sample_data *data, 1342 struct pt_regs *regs); 1343 1344static inline bool 1345__is_default_overflow_handler(perf_overflow_handler_t overflow_handler) 1346{ 1347 if (likely(overflow_handler == perf_event_output_forward)) 1348 return true; 1349 if (unlikely(overflow_handler == perf_event_output_backward)) 1350 return true; 1351 return false; 1352} 1353 1354#define is_default_overflow_handler(event) \ 1355 __is_default_overflow_handler((event)->overflow_handler) 1356 1357#ifdef CONFIG_BPF_SYSCALL 1358static inline bool uses_default_overflow_handler(struct perf_event *event) 1359{ 1360 if (likely(is_default_overflow_handler(event))) 1361 return true; 1362 1363 return __is_default_overflow_handler(event->orig_overflow_handler); 1364} 1365#else 1366#define uses_default_overflow_handler(event) \ 1367 is_default_overflow_handler(event) 1368#endif 1369 1370extern void 1371perf_event_header__init_id(struct perf_event_header *header, 1372 struct perf_sample_data *data, 1373 struct perf_event *event); 1374extern void 1375perf_event__output_id_sample(struct perf_event *event, 1376 struct perf_output_handle *handle, 1377 struct perf_sample_data *sample); 1378 1379extern void 1380perf_log_lost_samples(struct perf_event *event, u64 lost); 1381 1382static inline bool event_has_any_exclude_flag(struct perf_event *event) 1383{ 1384 struct perf_event_attr *attr = &event->attr; 1385 1386 return attr->exclude_idle || attr->exclude_user || 1387 attr->exclude_kernel || attr->exclude_hv || 1388 attr->exclude_guest || attr->exclude_host; 1389} 1390 1391static inline bool is_sampling_event(struct perf_event *event) 1392{ 1393 return event->attr.sample_period != 0; 1394} 1395 1396/* 1397 * Return 1 for a software event, 0 for a hardware event 1398 */ 1399static inline int is_software_event(struct perf_event *event) 1400{ 1401 return event->event_caps & PERF_EV_CAP_SOFTWARE; 1402} 1403 1404/* 1405 * Return 1 for event in sw context, 0 for event in hw context 1406 */ 1407static inline int in_software_context(struct perf_event *event) 1408{ 1409 return event->pmu_ctx->pmu->task_ctx_nr == perf_sw_context; 1410} 1411 1412static inline int is_exclusive_pmu(struct pmu *pmu) 1413{ 1414 return pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE; 1415} 1416 1417extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX]; 1418 1419extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64); 1420extern void __perf_sw_event(u32, u64, struct pt_regs *, u64); 1421 1422#ifndef perf_arch_fetch_caller_regs 1423static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { } 1424#endif 1425 1426/* 1427 * When generating a perf sample in-line, instead of from an interrupt / 1428 * exception, we lack a pt_regs. This is typically used from software events 1429 * like: SW_CONTEXT_SWITCHES, SW_MIGRATIONS and the tie-in with tracepoints. 1430 * 1431 * We typically don't need a full set, but (for x86) do require: 1432 * - ip for PERF_SAMPLE_IP 1433 * - cs for user_mode() tests 1434 * - sp for PERF_SAMPLE_CALLCHAIN 1435 * - eflags for MISC bits and CALLCHAIN (see: perf_hw_regs()) 1436 * 1437 * NOTE: assumes @regs is otherwise already 0 filled; this is important for 1438 * things like PERF_SAMPLE_REGS_INTR. 1439 */ 1440static inline void perf_fetch_caller_regs(struct pt_regs *regs) 1441{ 1442 perf_arch_fetch_caller_regs(regs, CALLER_ADDR0); 1443} 1444 1445static __always_inline void 1446perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) 1447{ 1448 if (static_key_false(&perf_swevent_enabled[event_id])) 1449 __perf_sw_event(event_id, nr, regs, addr); 1450} 1451 1452DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]); 1453 1454/* 1455 * 'Special' version for the scheduler, it hard assumes no recursion, 1456 * which is guaranteed by us not actually scheduling inside other swevents 1457 * because those disable preemption. 1458 */ 1459static __always_inline void __perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) 1460{ 1461 struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]); 1462 1463 perf_fetch_caller_regs(regs); 1464 ___perf_sw_event(event_id, nr, regs, addr); 1465} 1466 1467extern struct static_key_false perf_sched_events; 1468 1469static __always_inline bool __perf_sw_enabled(int swevt) 1470{ 1471 return static_key_false(&perf_swevent_enabled[swevt]); 1472} 1473 1474static inline void perf_event_task_migrate(struct task_struct *task) 1475{ 1476 if (__perf_sw_enabled(PERF_COUNT_SW_CPU_MIGRATIONS)) 1477 task->sched_migrated = 1; 1478} 1479 1480static inline void perf_event_task_sched_in(struct task_struct *prev, 1481 struct task_struct *task) 1482{ 1483 if (static_branch_unlikely(&perf_sched_events)) 1484 __perf_event_task_sched_in(prev, task); 1485 1486 if (__perf_sw_enabled(PERF_COUNT_SW_CPU_MIGRATIONS) && 1487 task->sched_migrated) { 1488 __perf_sw_event_sched(PERF_COUNT_SW_CPU_MIGRATIONS, 1, 0); 1489 task->sched_migrated = 0; 1490 } 1491} 1492 1493static inline void perf_event_task_sched_out(struct task_struct *prev, 1494 struct task_struct *next) 1495{ 1496 if (__perf_sw_enabled(PERF_COUNT_SW_CONTEXT_SWITCHES)) 1497 __perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0); 1498 1499#ifdef CONFIG_CGROUP_PERF 1500 if (__perf_sw_enabled(PERF_COUNT_SW_CGROUP_SWITCHES) && 1501 perf_cgroup_from_task(prev, NULL) != 1502 perf_cgroup_from_task(next, NULL)) 1503 __perf_sw_event_sched(PERF_COUNT_SW_CGROUP_SWITCHES, 1, 0); 1504#endif 1505 1506 if (static_branch_unlikely(&perf_sched_events)) 1507 __perf_event_task_sched_out(prev, next); 1508} 1509 1510extern void perf_event_mmap(struct vm_area_struct *vma); 1511 1512extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, 1513 bool unregister, const char *sym); 1514extern void perf_event_bpf_event(struct bpf_prog *prog, 1515 enum perf_bpf_event_type type, 1516 u16 flags); 1517 1518#ifdef CONFIG_GUEST_PERF_EVENTS 1519extern struct perf_guest_info_callbacks __rcu *perf_guest_cbs; 1520 1521DECLARE_STATIC_CALL(__perf_guest_state, *perf_guest_cbs->state); 1522DECLARE_STATIC_CALL(__perf_guest_get_ip, *perf_guest_cbs->get_ip); 1523DECLARE_STATIC_CALL(__perf_guest_handle_intel_pt_intr, *perf_guest_cbs->handle_intel_pt_intr); 1524 1525static inline unsigned int perf_guest_state(void) 1526{ 1527 return static_call(__perf_guest_state)(); 1528} 1529static inline unsigned long perf_guest_get_ip(void) 1530{ 1531 return static_call(__perf_guest_get_ip)(); 1532} 1533static inline unsigned int perf_guest_handle_intel_pt_intr(void) 1534{ 1535 return static_call(__perf_guest_handle_intel_pt_intr)(); 1536} 1537extern void perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs); 1538extern void perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs); 1539#else 1540static inline unsigned int perf_guest_state(void) { return 0; } 1541static inline unsigned long perf_guest_get_ip(void) { return 0; } 1542static inline unsigned int perf_guest_handle_intel_pt_intr(void) { return 0; } 1543#endif /* CONFIG_GUEST_PERF_EVENTS */ 1544 1545extern void perf_event_exec(void); 1546extern void perf_event_comm(struct task_struct *tsk, bool exec); 1547extern void perf_event_namespaces(struct task_struct *tsk); 1548extern void perf_event_fork(struct task_struct *tsk); 1549extern void perf_event_text_poke(const void *addr, 1550 const void *old_bytes, size_t old_len, 1551 const void *new_bytes, size_t new_len); 1552 1553/* Callchains */ 1554DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry); 1555 1556extern void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); 1557extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); 1558extern struct perf_callchain_entry * 1559get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user, 1560 u32 max_stack, bool crosstask, bool add_mark); 1561extern int get_callchain_buffers(int max_stack); 1562extern void put_callchain_buffers(void); 1563extern struct perf_callchain_entry *get_callchain_entry(int *rctx); 1564extern void put_callchain_entry(int rctx); 1565 1566extern int sysctl_perf_event_max_stack; 1567extern int sysctl_perf_event_max_contexts_per_stack; 1568 1569static inline int perf_callchain_store_context(struct perf_callchain_entry_ctx *ctx, u64 ip) 1570{ 1571 if (ctx->contexts < sysctl_perf_event_max_contexts_per_stack) { 1572 struct perf_callchain_entry *entry = ctx->entry; 1573 entry->ip[entry->nr++] = ip; 1574 ++ctx->contexts; 1575 return 0; 1576 } else { 1577 ctx->contexts_maxed = true; 1578 return -1; /* no more room, stop walking the stack */ 1579 } 1580} 1581 1582static inline int perf_callchain_store(struct perf_callchain_entry_ctx *ctx, u64 ip) 1583{ 1584 if (ctx->nr < ctx->max_stack && !ctx->contexts_maxed) { 1585 struct perf_callchain_entry *entry = ctx->entry; 1586 entry->ip[entry->nr++] = ip; 1587 ++ctx->nr; 1588 return 0; 1589 } else { 1590 return -1; /* no more room, stop walking the stack */ 1591 } 1592} 1593 1594extern int sysctl_perf_event_paranoid; 1595extern int sysctl_perf_event_mlock; 1596extern int sysctl_perf_event_sample_rate; 1597extern int sysctl_perf_cpu_time_max_percent; 1598 1599extern void perf_sample_event_took(u64 sample_len_ns); 1600 1601int perf_event_max_sample_rate_handler(struct ctl_table *table, int write, 1602 void *buffer, size_t *lenp, loff_t *ppos); 1603int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write, 1604 void *buffer, size_t *lenp, loff_t *ppos); 1605int perf_event_max_stack_handler(struct ctl_table *table, int write, 1606 void *buffer, size_t *lenp, loff_t *ppos); 1607 1608/* Access to perf_event_open(2) syscall. */ 1609#define PERF_SECURITY_OPEN 0 1610 1611/* Finer grained perf_event_open(2) access control. */ 1612#define PERF_SECURITY_CPU 1 1613#define PERF_SECURITY_KERNEL 2 1614#define PERF_SECURITY_TRACEPOINT 3 1615 1616static inline int perf_is_paranoid(void) 1617{ 1618 return sysctl_perf_event_paranoid > -1; 1619} 1620 1621static inline int perf_allow_kernel(struct perf_event_attr *attr) 1622{ 1623 if (sysctl_perf_event_paranoid > 1 && !perfmon_capable()) 1624 return -EACCES; 1625 1626 return security_perf_event_open(attr, PERF_SECURITY_KERNEL); 1627} 1628 1629static inline int perf_allow_cpu(struct perf_event_attr *attr) 1630{ 1631 if (sysctl_perf_event_paranoid > 0 && !perfmon_capable()) 1632 return -EACCES; 1633 1634 return security_perf_event_open(attr, PERF_SECURITY_CPU); 1635} 1636 1637static inline int perf_allow_tracepoint(struct perf_event_attr *attr) 1638{ 1639 if (sysctl_perf_event_paranoid > -1 && !perfmon_capable()) 1640 return -EPERM; 1641 1642 return security_perf_event_open(attr, PERF_SECURITY_TRACEPOINT); 1643} 1644 1645extern void perf_event_init(void); 1646extern void perf_tp_event(u16 event_type, u64 count, void *record, 1647 int entry_size, struct pt_regs *regs, 1648 struct hlist_head *head, int rctx, 1649 struct task_struct *task); 1650extern void perf_bp_event(struct perf_event *event, void *data); 1651 1652#ifndef perf_misc_flags 1653# define perf_misc_flags(regs) \ 1654 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL) 1655# define perf_instruction_pointer(regs) instruction_pointer(regs) 1656#endif 1657#ifndef perf_arch_bpf_user_pt_regs 1658# define perf_arch_bpf_user_pt_regs(regs) regs 1659#endif 1660 1661static inline bool has_branch_stack(struct perf_event *event) 1662{ 1663 return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK; 1664} 1665 1666static inline bool needs_branch_stack(struct perf_event *event) 1667{ 1668 return event->attr.branch_sample_type != 0; 1669} 1670 1671static inline bool has_aux(struct perf_event *event) 1672{ 1673 return event->pmu->setup_aux; 1674} 1675 1676static inline bool is_write_backward(struct perf_event *event) 1677{ 1678 return !!event->attr.write_backward; 1679} 1680 1681static inline bool has_addr_filter(struct perf_event *event) 1682{ 1683 return event->pmu->nr_addr_filters; 1684} 1685 1686/* 1687 * An inherited event uses parent's filters 1688 */ 1689static inline struct perf_addr_filters_head * 1690perf_event_addr_filters(struct perf_event *event) 1691{ 1692 struct perf_addr_filters_head *ifh = &event->addr_filters; 1693 1694 if (event->parent) 1695 ifh = &event->parent->addr_filters; 1696 1697 return ifh; 1698} 1699 1700extern void perf_event_addr_filters_sync(struct perf_event *event); 1701extern void perf_report_aux_output_id(struct perf_event *event, u64 hw_id); 1702 1703extern int perf_output_begin(struct perf_output_handle *handle, 1704 struct perf_sample_data *data, 1705 struct perf_event *event, unsigned int size); 1706extern int perf_output_begin_forward(struct perf_output_handle *handle, 1707 struct perf_sample_data *data, 1708 struct perf_event *event, 1709 unsigned int size); 1710extern int perf_output_begin_backward(struct perf_output_handle *handle, 1711 struct perf_sample_data *data, 1712 struct perf_event *event, 1713 unsigned int size); 1714 1715extern void perf_output_end(struct perf_output_handle *handle); 1716extern unsigned int perf_output_copy(struct perf_output_handle *handle, 1717 const void *buf, unsigned int len); 1718extern unsigned int perf_output_skip(struct perf_output_handle *handle, 1719 unsigned int len); 1720extern long perf_output_copy_aux(struct perf_output_handle *aux_handle, 1721 struct perf_output_handle *handle, 1722 unsigned long from, unsigned long to); 1723extern int perf_swevent_get_recursion_context(void); 1724extern void perf_swevent_put_recursion_context(int rctx); 1725extern u64 perf_swevent_set_period(struct perf_event *event); 1726extern void perf_event_enable(struct perf_event *event); 1727extern void perf_event_disable(struct perf_event *event); 1728extern void perf_event_disable_local(struct perf_event *event); 1729extern void perf_event_disable_inatomic(struct perf_event *event); 1730extern void perf_event_task_tick(void); 1731extern int perf_event_account_interrupt(struct perf_event *event); 1732extern int perf_event_period(struct perf_event *event, u64 value); 1733extern u64 perf_event_pause(struct perf_event *event, bool reset); 1734#else /* !CONFIG_PERF_EVENTS: */ 1735static inline void * 1736perf_aux_output_begin(struct perf_output_handle *handle, 1737 struct perf_event *event) { return NULL; } 1738static inline void 1739perf_aux_output_end(struct perf_output_handle *handle, unsigned long size) 1740 { } 1741static inline int 1742perf_aux_output_skip(struct perf_output_handle *handle, 1743 unsigned long size) { return -EINVAL; } 1744static inline void * 1745perf_get_aux(struct perf_output_handle *handle) { return NULL; } 1746static inline void 1747perf_event_task_migrate(struct task_struct *task) { } 1748static inline void 1749perf_event_task_sched_in(struct task_struct *prev, 1750 struct task_struct *task) { } 1751static inline void 1752perf_event_task_sched_out(struct task_struct *prev, 1753 struct task_struct *next) { } 1754static inline int perf_event_init_task(struct task_struct *child, 1755 u64 clone_flags) { return 0; } 1756static inline void perf_event_exit_task(struct task_struct *child) { } 1757static inline void perf_event_free_task(struct task_struct *task) { } 1758static inline void perf_event_delayed_put(struct task_struct *task) { } 1759static inline struct file *perf_event_get(unsigned int fd) { return ERR_PTR(-EINVAL); } 1760static inline const struct perf_event *perf_get_event(struct file *file) 1761{ 1762 return ERR_PTR(-EINVAL); 1763} 1764static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event) 1765{ 1766 return ERR_PTR(-EINVAL); 1767} 1768static inline int perf_event_read_local(struct perf_event *event, u64 *value, 1769 u64 *enabled, u64 *running) 1770{ 1771 return -EINVAL; 1772} 1773static inline void perf_event_print_debug(void) { } 1774static inline int perf_event_task_disable(void) { return -EINVAL; } 1775static inline int perf_event_task_enable(void) { return -EINVAL; } 1776static inline int perf_event_refresh(struct perf_event *event, int refresh) 1777{ 1778 return -EINVAL; 1779} 1780 1781static inline void 1782perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { } 1783static inline void 1784perf_bp_event(struct perf_event *event, void *data) { } 1785 1786static inline void perf_event_mmap(struct vm_area_struct *vma) { } 1787 1788typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data); 1789static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, 1790 bool unregister, const char *sym) { } 1791static inline void perf_event_bpf_event(struct bpf_prog *prog, 1792 enum perf_bpf_event_type type, 1793 u16 flags) { } 1794static inline void perf_event_exec(void) { } 1795static inline void perf_event_comm(struct task_struct *tsk, bool exec) { } 1796static inline void perf_event_namespaces(struct task_struct *tsk) { } 1797static inline void perf_event_fork(struct task_struct *tsk) { } 1798static inline void perf_event_text_poke(const void *addr, 1799 const void *old_bytes, 1800 size_t old_len, 1801 const void *new_bytes, 1802 size_t new_len) { } 1803static inline void perf_event_init(void) { } 1804static inline int perf_swevent_get_recursion_context(void) { return -1; } 1805static inline void perf_swevent_put_recursion_context(int rctx) { } 1806static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; } 1807static inline void perf_event_enable(struct perf_event *event) { } 1808static inline void perf_event_disable(struct perf_event *event) { } 1809static inline int __perf_event_disable(void *info) { return -1; } 1810static inline void perf_event_task_tick(void) { } 1811static inline int perf_event_release_kernel(struct perf_event *event) { return 0; } 1812static inline int perf_event_period(struct perf_event *event, u64 value) 1813{ 1814 return -EINVAL; 1815} 1816static inline u64 perf_event_pause(struct perf_event *event, bool reset) 1817{ 1818 return 0; 1819} 1820#endif 1821 1822#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL) 1823extern void perf_restore_debug_store(void); 1824#else 1825static inline void perf_restore_debug_store(void) { } 1826#endif 1827 1828#define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x)) 1829 1830struct perf_pmu_events_attr { 1831 struct device_attribute attr; 1832 u64 id; 1833 const char *event_str; 1834}; 1835 1836struct perf_pmu_events_ht_attr { 1837 struct device_attribute attr; 1838 u64 id; 1839 const char *event_str_ht; 1840 const char *event_str_noht; 1841}; 1842 1843struct perf_pmu_events_hybrid_attr { 1844 struct device_attribute attr; 1845 u64 id; 1846 const char *event_str; 1847 u64 pmu_type; 1848}; 1849 1850struct perf_pmu_format_hybrid_attr { 1851 struct device_attribute attr; 1852 u64 pmu_type; 1853}; 1854 1855ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr, 1856 char *page); 1857 1858#define PMU_EVENT_ATTR(_name, _var, _id, _show) \ 1859static struct perf_pmu_events_attr _var = { \ 1860 .attr = __ATTR(_name, 0444, _show, NULL), \ 1861 .id = _id, \ 1862}; 1863 1864#define PMU_EVENT_ATTR_STRING(_name, _var, _str) \ 1865static struct perf_pmu_events_attr _var = { \ 1866 .attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \ 1867 .id = 0, \ 1868 .event_str = _str, \ 1869}; 1870 1871#define PMU_EVENT_ATTR_ID(_name, _show, _id) \ 1872 (&((struct perf_pmu_events_attr[]) { \ 1873 { .attr = __ATTR(_name, 0444, _show, NULL), \ 1874 .id = _id, } \ 1875 })[0].attr.attr) 1876 1877#define PMU_FORMAT_ATTR_SHOW(_name, _format) \ 1878static ssize_t \ 1879_name##_show(struct device *dev, \ 1880 struct device_attribute *attr, \ 1881 char *page) \ 1882{ \ 1883 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \ 1884 return sprintf(page, _format "\n"); \ 1885} \ 1886 1887#define PMU_FORMAT_ATTR(_name, _format) \ 1888 PMU_FORMAT_ATTR_SHOW(_name, _format) \ 1889 \ 1890static struct device_attribute format_attr_##_name = __ATTR_RO(_name) 1891 1892/* Performance counter hotplug functions */ 1893#ifdef CONFIG_PERF_EVENTS 1894int perf_event_init_cpu(unsigned int cpu); 1895int perf_event_exit_cpu(unsigned int cpu); 1896#else 1897#define perf_event_init_cpu NULL 1898#define perf_event_exit_cpu NULL 1899#endif 1900 1901extern void arch_perf_update_userpage(struct perf_event *event, 1902 struct perf_event_mmap_page *userpg, 1903 u64 now); 1904 1905/* 1906 * Snapshot branch stack on software events. 1907 * 1908 * Branch stack can be very useful in understanding software events. For 1909 * example, when a long function, e.g. sys_perf_event_open, returns an 1910 * errno, it is not obvious why the function failed. Branch stack could 1911 * provide very helpful information in this type of scenarios. 1912 * 1913 * On software event, it is necessary to stop the hardware branch recorder 1914 * fast. Otherwise, the hardware register/buffer will be flushed with 1915 * entries of the triggering event. Therefore, static call is used to 1916 * stop the hardware recorder. 1917 */ 1918 1919/* 1920 * cnt is the number of entries allocated for entries. 1921 * Return number of entries copied to . 1922 */ 1923typedef int (perf_snapshot_branch_stack_t)(struct perf_branch_entry *entries, 1924 unsigned int cnt); 1925DECLARE_STATIC_CALL(perf_snapshot_branch_stack, perf_snapshot_branch_stack_t); 1926 1927#ifndef PERF_NEEDS_LOPWR_CB 1928static inline void perf_lopwr_cb(bool mode) 1929{ 1930} 1931#endif 1932 1933#endif /* _LINUX_PERF_EVENT_H */ 1934