| 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 | struct perf_guest_info_callbacks { |
| 30 | int (*is_in_guest)(void); |
| 31 | int (*is_user_mode)(void); |
| 32 | unsigned long (*get_guest_ip)(void); |
| 33 | }; |
| 34 | |
| 35 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 36 | #include <asm/hw_breakpoint.h> |
| 37 | #endif |
| 38 | |
| 39 | #include <linux/list.h> |
| 40 | #include <linux/mutex.h> |
| 41 | #include <linux/rculist.h> |
| 42 | #include <linux/rcupdate.h> |
| 43 | #include <linux/spinlock.h> |
| 44 | #include <linux/hrtimer.h> |
| 45 | #include <linux/fs.h> |
| 46 | #include <linux/pid_namespace.h> |
| 47 | #include <linux/workqueue.h> |
| 48 | #include <linux/ftrace.h> |
| 49 | #include <linux/cpu.h> |
| 50 | #include <linux/irq_work.h> |
| 51 | #include <linux/static_key.h> |
| 52 | #include <linux/jump_label_ratelimit.h> |
| 53 | #include <linux/atomic.h> |
| 54 | #include <linux/sysfs.h> |
| 55 | #include <linux/perf_regs.h> |
| 56 | #include <linux/cgroup.h> |
| 57 | #include <linux/refcount.h> |
| 58 | #include <asm/local.h> |
| 59 | |
| 60 | struct perf_callchain_entry { |
| 61 | __u64 nr; |
| 62 | __u64 ip[0]; /* /proc/sys/kernel/perf_event_max_stack */ |
| 63 | }; |
| 64 | |
| 65 | struct perf_callchain_entry_ctx { |
| 66 | struct perf_callchain_entry *entry; |
| 67 | u32 max_stack; |
| 68 | u32 nr; |
| 69 | short contexts; |
| 70 | bool contexts_maxed; |
| 71 | }; |
| 72 | |
| 73 | typedef unsigned long (*perf_copy_f)(void *dst, const void *src, |
| 74 | unsigned long off, unsigned long len); |
| 75 | |
| 76 | struct perf_raw_frag { |
| 77 | union { |
| 78 | struct perf_raw_frag *next; |
| 79 | unsigned long pad; |
| 80 | }; |
| 81 | perf_copy_f copy; |
| 82 | void *data; |
| 83 | u32 size; |
| 84 | } __packed; |
| 85 | |
| 86 | struct perf_raw_record { |
| 87 | struct perf_raw_frag frag; |
| 88 | u32 size; |
| 89 | }; |
| 90 | |
| 91 | /* |
| 92 | * branch stack layout: |
| 93 | * nr: number of taken branches stored in entries[] |
| 94 | * |
| 95 | * Note that nr can vary from sample to sample |
| 96 | * branches (to, from) are stored from most recent |
| 97 | * to least recent, i.e., entries[0] contains the most |
| 98 | * recent branch. |
| 99 | */ |
| 100 | struct perf_branch_stack { |
| 101 | __u64 nr; |
| 102 | struct perf_branch_entry entries[0]; |
| 103 | }; |
| 104 | |
| 105 | struct task_struct; |
| 106 | |
| 107 | /* |
| 108 | * extra PMU register associated with an event |
| 109 | */ |
| 110 | struct hw_perf_event_extra { |
| 111 | u64 config; /* register value */ |
| 112 | unsigned int reg; /* register address or index */ |
| 113 | int alloc; /* extra register already allocated */ |
| 114 | int idx; /* index in shared_regs->regs[] */ |
| 115 | }; |
| 116 | |
| 117 | /** |
| 118 | * struct hw_perf_event - performance event hardware details: |
| 119 | */ |
| 120 | struct hw_perf_event { |
| 121 | #ifdef CONFIG_PERF_EVENTS |
| 122 | union { |
| 123 | struct { /* hardware */ |
| 124 | u64 config; |
| 125 | u64 last_tag; |
| 126 | unsigned long config_base; |
| 127 | unsigned long event_base; |
| 128 | int event_base_rdpmc; |
| 129 | int idx; |
| 130 | int last_cpu; |
| 131 | int flags; |
| 132 | |
| 133 | struct hw_perf_event_extra extra_reg; |
| 134 | struct hw_perf_event_extra branch_reg; |
| 135 | }; |
| 136 | struct { /* software */ |
| 137 | struct hrtimer hrtimer; |
| 138 | }; |
| 139 | struct { /* tracepoint */ |
| 140 | /* for tp_event->class */ |
| 141 | struct list_head tp_list; |
| 142 | }; |
| 143 | struct { /* amd_power */ |
| 144 | u64 pwr_acc; |
| 145 | u64 ptsc; |
| 146 | }; |
| 147 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 148 | struct { /* breakpoint */ |
| 149 | /* |
| 150 | * Crufty hack to avoid the chicken and egg |
| 151 | * problem hw_breakpoint has with context |
| 152 | * creation and event initalization. |
| 153 | */ |
| 154 | struct arch_hw_breakpoint info; |
| 155 | struct list_head bp_list; |
| 156 | }; |
| 157 | #endif |
| 158 | struct { /* amd_iommu */ |
| 159 | u8 iommu_bank; |
| 160 | u8 iommu_cntr; |
| 161 | u16 padding; |
| 162 | u64 conf; |
| 163 | u64 conf1; |
| 164 | }; |
| 165 | }; |
| 166 | /* |
| 167 | * If the event is a per task event, this will point to the task in |
| 168 | * question. See the comment in perf_event_alloc(). |
| 169 | */ |
| 170 | struct task_struct *target; |
| 171 | |
| 172 | /* |
| 173 | * PMU would store hardware filter configuration |
| 174 | * here. |
| 175 | */ |
| 176 | void *addr_filters; |
| 177 | |
| 178 | /* Last sync'ed generation of filters */ |
| 179 | unsigned long addr_filters_gen; |
| 180 | |
| 181 | /* |
| 182 | * hw_perf_event::state flags; used to track the PERF_EF_* state. |
| 183 | */ |
| 184 | #define PERF_HES_STOPPED 0x01 /* the counter is stopped */ |
| 185 | #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */ |
| 186 | #define PERF_HES_ARCH 0x04 |
| 187 | |
| 188 | int state; |
| 189 | |
| 190 | /* |
| 191 | * The last observed hardware counter value, updated with a |
| 192 | * local64_cmpxchg() such that pmu::read() can be called nested. |
| 193 | */ |
| 194 | local64_t prev_count; |
| 195 | |
| 196 | /* |
| 197 | * The period to start the next sample with. |
| 198 | */ |
| 199 | u64 sample_period; |
| 200 | |
| 201 | /* |
| 202 | * The period we started this sample with. |
| 203 | */ |
| 204 | u64 last_period; |
| 205 | |
| 206 | /* |
| 207 | * However much is left of the current period; note that this is |
| 208 | * a full 64bit value and allows for generation of periods longer |
| 209 | * than hardware might allow. |
| 210 | */ |
| 211 | local64_t period_left; |
| 212 | |
| 213 | /* |
| 214 | * State for throttling the event, see __perf_event_overflow() and |
| 215 | * perf_adjust_freq_unthr_context(). |
| 216 | */ |
| 217 | u64 interrupts_seq; |
| 218 | u64 interrupts; |
| 219 | |
| 220 | /* |
| 221 | * State for freq target events, see __perf_event_overflow() and |
| 222 | * perf_adjust_freq_unthr_context(). |
| 223 | */ |
| 224 | u64 freq_time_stamp; |
| 225 | u64 freq_count_stamp; |
| 226 | #endif |
| 227 | }; |
| 228 | |
| 229 | struct perf_event; |
| 230 | |
| 231 | /* |
| 232 | * Common implementation detail of pmu::{start,commit,cancel}_txn |
| 233 | */ |
| 234 | #define PERF_PMU_TXN_ADD 0x1 /* txn to add/schedule event on PMU */ |
| 235 | #define PERF_PMU_TXN_READ 0x2 /* txn to read event group from PMU */ |
| 236 | |
| 237 | /** |
| 238 | * pmu::capabilities flags |
| 239 | */ |
| 240 | #define PERF_PMU_CAP_NO_INTERRUPT 0x01 |
| 241 | #define PERF_PMU_CAP_NO_NMI 0x02 |
| 242 | #define PERF_PMU_CAP_AUX_NO_SG 0x04 |
| 243 | #define PERF_PMU_CAP_AUX_SW_DOUBLEBUF 0x08 |
| 244 | #define PERF_PMU_CAP_EXCLUSIVE 0x10 |
| 245 | #define PERF_PMU_CAP_ITRACE 0x20 |
| 246 | #define PERF_PMU_CAP_HETEROGENEOUS_CPUS 0x40 |
| 247 | #define PERF_PMU_CAP_NO_EXCLUDE 0x80 |
| 248 | |
| 249 | /** |
| 250 | * struct pmu - generic performance monitoring unit |
| 251 | */ |
| 252 | struct pmu { |
| 253 | struct list_head entry; |
| 254 | |
| 255 | struct module *module; |
| 256 | struct device *dev; |
| 257 | const struct attribute_group **attr_groups; |
| 258 | const char *name; |
| 259 | int type; |
| 260 | |
| 261 | /* |
| 262 | * various common per-pmu feature flags |
| 263 | */ |
| 264 | int capabilities; |
| 265 | |
| 266 | int __percpu *pmu_disable_count; |
| 267 | struct perf_cpu_context __percpu *pmu_cpu_context; |
| 268 | atomic_t exclusive_cnt; /* < 0: cpu; > 0: tsk */ |
| 269 | int task_ctx_nr; |
| 270 | int hrtimer_interval_ms; |
| 271 | |
| 272 | /* number of address filters this PMU can do */ |
| 273 | unsigned int nr_addr_filters; |
| 274 | |
| 275 | /* |
| 276 | * Fully disable/enable this PMU, can be used to protect from the PMI |
| 277 | * as well as for lazy/batch writing of the MSRs. |
| 278 | */ |
| 279 | void (*pmu_enable) (struct pmu *pmu); /* optional */ |
| 280 | void (*pmu_disable) (struct pmu *pmu); /* optional */ |
| 281 | |
| 282 | /* |
| 283 | * Try and initialize the event for this PMU. |
| 284 | * |
| 285 | * Returns: |
| 286 | * -ENOENT -- @event is not for this PMU |
| 287 | * |
| 288 | * -ENODEV -- @event is for this PMU but PMU not present |
| 289 | * -EBUSY -- @event is for this PMU but PMU temporarily unavailable |
| 290 | * -EINVAL -- @event is for this PMU but @event is not valid |
| 291 | * -EOPNOTSUPP -- @event is for this PMU, @event is valid, but not supported |
| 292 | * -EACCESS -- @event is for this PMU, @event is valid, but no privilidges |
| 293 | * |
| 294 | * 0 -- @event is for this PMU and valid |
| 295 | * |
| 296 | * Other error return values are allowed. |
| 297 | */ |
| 298 | int (*event_init) (struct perf_event *event); |
| 299 | |
| 300 | /* |
| 301 | * Notification that the event was mapped or unmapped. Called |
| 302 | * in the context of the mapping task. |
| 303 | */ |
| 304 | void (*event_mapped) (struct perf_event *event, struct mm_struct *mm); /* optional */ |
| 305 | void (*event_unmapped) (struct perf_event *event, struct mm_struct *mm); /* optional */ |
| 306 | |
| 307 | /* |
| 308 | * Flags for ->add()/->del()/ ->start()/->stop(). There are |
| 309 | * matching hw_perf_event::state flags. |
| 310 | */ |
| 311 | #define PERF_EF_START 0x01 /* start the counter when adding */ |
| 312 | #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */ |
| 313 | #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */ |
| 314 | |
| 315 | /* |
| 316 | * Adds/Removes a counter to/from the PMU, can be done inside a |
| 317 | * transaction, see the ->*_txn() methods. |
| 318 | * |
| 319 | * The add/del callbacks will reserve all hardware resources required |
| 320 | * to service the event, this includes any counter constraint |
| 321 | * scheduling etc. |
| 322 | * |
| 323 | * Called with IRQs disabled and the PMU disabled on the CPU the event |
| 324 | * is on. |
| 325 | * |
| 326 | * ->add() called without PERF_EF_START should result in the same state |
| 327 | * as ->add() followed by ->stop(). |
| 328 | * |
| 329 | * ->del() must always PERF_EF_UPDATE stop an event. If it calls |
| 330 | * ->stop() that must deal with already being stopped without |
| 331 | * PERF_EF_UPDATE. |
| 332 | */ |
| 333 | int (*add) (struct perf_event *event, int flags); |
| 334 | void (*del) (struct perf_event *event, int flags); |
| 335 | |
| 336 | /* |
| 337 | * Starts/Stops a counter present on the PMU. |
| 338 | * |
| 339 | * The PMI handler should stop the counter when perf_event_overflow() |
| 340 | * returns !0. ->start() will be used to continue. |
| 341 | * |
| 342 | * Also used to change the sample period. |
| 343 | * |
| 344 | * Called with IRQs disabled and the PMU disabled on the CPU the event |
| 345 | * is on -- will be called from NMI context with the PMU generates |
| 346 | * NMIs. |
| 347 | * |
| 348 | * ->stop() with PERF_EF_UPDATE will read the counter and update |
| 349 | * period/count values like ->read() would. |
| 350 | * |
| 351 | * ->start() with PERF_EF_RELOAD will reprogram the the counter |
| 352 | * value, must be preceded by a ->stop() with PERF_EF_UPDATE. |
| 353 | */ |
| 354 | void (*start) (struct perf_event *event, int flags); |
| 355 | void (*stop) (struct perf_event *event, int flags); |
| 356 | |
| 357 | /* |
| 358 | * Updates the counter value of the event. |
| 359 | * |
| 360 | * For sampling capable PMUs this will also update the software period |
| 361 | * hw_perf_event::period_left field. |
| 362 | */ |
| 363 | void (*read) (struct perf_event *event); |
| 364 | |
| 365 | /* |
| 366 | * Group events scheduling is treated as a transaction, add |
| 367 | * group events as a whole and perform one schedulability test. |
| 368 | * If the test fails, roll back the whole group |
| 369 | * |
| 370 | * Start the transaction, after this ->add() doesn't need to |
| 371 | * do schedulability tests. |
| 372 | * |
| 373 | * Optional. |
| 374 | */ |
| 375 | void (*start_txn) (struct pmu *pmu, unsigned int txn_flags); |
| 376 | /* |
| 377 | * If ->start_txn() disabled the ->add() schedulability test |
| 378 | * then ->commit_txn() is required to perform one. On success |
| 379 | * the transaction is closed. On error the transaction is kept |
| 380 | * open until ->cancel_txn() is called. |
| 381 | * |
| 382 | * Optional. |
| 383 | */ |
| 384 | int (*commit_txn) (struct pmu *pmu); |
| 385 | /* |
| 386 | * Will cancel the transaction, assumes ->del() is called |
| 387 | * for each successful ->add() during the transaction. |
| 388 | * |
| 389 | * Optional. |
| 390 | */ |
| 391 | void (*cancel_txn) (struct pmu *pmu); |
| 392 | |
| 393 | /* |
| 394 | * Will return the value for perf_event_mmap_page::index for this event, |
| 395 | * if no implementation is provided it will default to: event->hw.idx + 1. |
| 396 | */ |
| 397 | int (*event_idx) (struct perf_event *event); /*optional */ |
| 398 | |
| 399 | /* |
| 400 | * context-switches callback |
| 401 | */ |
| 402 | void (*sched_task) (struct perf_event_context *ctx, |
| 403 | bool sched_in); |
| 404 | /* |
| 405 | * PMU specific data size |
| 406 | */ |
| 407 | size_t task_ctx_size; |
| 408 | |
| 409 | |
| 410 | /* |
| 411 | * Set up pmu-private data structures for an AUX area |
| 412 | */ |
| 413 | void *(*setup_aux) (struct perf_event *event, void **pages, |
| 414 | int nr_pages, bool overwrite); |
| 415 | /* optional */ |
| 416 | |
| 417 | /* |
| 418 | * Free pmu-private AUX data structures |
| 419 | */ |
| 420 | void (*free_aux) (void *aux); /* optional */ |
| 421 | |
| 422 | /* |
| 423 | * Validate address range filters: make sure the HW supports the |
| 424 | * requested configuration and number of filters; return 0 if the |
| 425 | * supplied filters are valid, -errno otherwise. |
| 426 | * |
| 427 | * Runs in the context of the ioctl()ing process and is not serialized |
| 428 | * with the rest of the PMU callbacks. |
| 429 | */ |
| 430 | int (*addr_filters_validate) (struct list_head *filters); |
| 431 | /* optional */ |
| 432 | |
| 433 | /* |
| 434 | * Synchronize address range filter configuration: |
| 435 | * translate hw-agnostic filters into hardware configuration in |
| 436 | * event::hw::addr_filters. |
| 437 | * |
| 438 | * Runs as a part of filter sync sequence that is done in ->start() |
| 439 | * callback by calling perf_event_addr_filters_sync(). |
| 440 | * |
| 441 | * May (and should) traverse event::addr_filters::list, for which its |
| 442 | * caller provides necessary serialization. |
| 443 | */ |
| 444 | void (*addr_filters_sync) (struct perf_event *event); |
| 445 | /* optional */ |
| 446 | |
| 447 | /* |
| 448 | * Filter events for PMU-specific reasons. |
| 449 | */ |
| 450 | int (*filter_match) (struct perf_event *event); /* optional */ |
| 451 | |
| 452 | /* |
| 453 | * Check period value for PERF_EVENT_IOC_PERIOD ioctl. |
| 454 | */ |
| 455 | int (*check_period) (struct perf_event *event, u64 value); /* optional */ |
| 456 | }; |
| 457 | |
| 458 | enum perf_addr_filter_action_t { |
| 459 | PERF_ADDR_FILTER_ACTION_STOP = 0, |
| 460 | PERF_ADDR_FILTER_ACTION_START, |
| 461 | PERF_ADDR_FILTER_ACTION_FILTER, |
| 462 | }; |
| 463 | |
| 464 | /** |
| 465 | * struct perf_addr_filter - address range filter definition |
| 466 | * @entry: event's filter list linkage |
| 467 | * @inode: object file's inode for file-based filters |
| 468 | * @offset: filter range offset |
| 469 | * @size: filter range size (size==0 means single address trigger) |
| 470 | * @action: filter/start/stop |
| 471 | * |
| 472 | * This is a hardware-agnostic filter configuration as specified by the user. |
| 473 | */ |
| 474 | struct perf_addr_filter { |
| 475 | struct list_head entry; |
| 476 | struct path path; |
| 477 | unsigned long offset; |
| 478 | unsigned long size; |
| 479 | enum perf_addr_filter_action_t action; |
| 480 | }; |
| 481 | |
| 482 | /** |
| 483 | * struct perf_addr_filters_head - container for address range filters |
| 484 | * @list: list of filters for this event |
| 485 | * @lock: spinlock that serializes accesses to the @list and event's |
| 486 | * (and its children's) filter generations. |
| 487 | * @nr_file_filters: number of file-based filters |
| 488 | * |
| 489 | * A child event will use parent's @list (and therefore @lock), so they are |
| 490 | * bundled together; see perf_event_addr_filters(). |
| 491 | */ |
| 492 | struct perf_addr_filters_head { |
| 493 | struct list_head list; |
| 494 | raw_spinlock_t lock; |
| 495 | unsigned int nr_file_filters; |
| 496 | }; |
| 497 | |
| 498 | struct perf_addr_filter_range { |
| 499 | unsigned long start; |
| 500 | unsigned long size; |
| 501 | }; |
| 502 | |
| 503 | /** |
| 504 | * enum perf_event_state - the states of an event: |
| 505 | */ |
| 506 | enum perf_event_state { |
| 507 | PERF_EVENT_STATE_DEAD = -4, |
| 508 | PERF_EVENT_STATE_EXIT = -3, |
| 509 | PERF_EVENT_STATE_ERROR = -2, |
| 510 | PERF_EVENT_STATE_OFF = -1, |
| 511 | PERF_EVENT_STATE_INACTIVE = 0, |
| 512 | PERF_EVENT_STATE_ACTIVE = 1, |
| 513 | }; |
| 514 | |
| 515 | struct file; |
| 516 | struct perf_sample_data; |
| 517 | |
| 518 | typedef void (*perf_overflow_handler_t)(struct perf_event *, |
| 519 | struct perf_sample_data *, |
| 520 | struct pt_regs *regs); |
| 521 | |
| 522 | /* |
| 523 | * Event capabilities. For event_caps and groups caps. |
| 524 | * |
| 525 | * PERF_EV_CAP_SOFTWARE: Is a software event. |
| 526 | * PERF_EV_CAP_READ_ACTIVE_PKG: A CPU event (or cgroup event) that can be read |
| 527 | * from any CPU in the package where it is active. |
| 528 | */ |
| 529 | #define PERF_EV_CAP_SOFTWARE BIT(0) |
| 530 | #define PERF_EV_CAP_READ_ACTIVE_PKG BIT(1) |
| 531 | |
| 532 | #define SWEVENT_HLIST_BITS 8 |
| 533 | #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS) |
| 534 | |
| 535 | struct swevent_hlist { |
| 536 | struct hlist_head heads[SWEVENT_HLIST_SIZE]; |
| 537 | struct rcu_head rcu_head; |
| 538 | }; |
| 539 | |
| 540 | #define PERF_ATTACH_CONTEXT 0x01 |
| 541 | #define PERF_ATTACH_GROUP 0x02 |
| 542 | #define PERF_ATTACH_TASK 0x04 |
| 543 | #define PERF_ATTACH_TASK_DATA 0x08 |
| 544 | #define PERF_ATTACH_ITRACE 0x10 |
| 545 | |
| 546 | struct perf_cgroup; |
| 547 | struct ring_buffer; |
| 548 | |
| 549 | struct pmu_event_list { |
| 550 | raw_spinlock_t lock; |
| 551 | struct list_head list; |
| 552 | }; |
| 553 | |
| 554 | #define for_each_sibling_event(sibling, event) \ |
| 555 | if ((event)->group_leader == (event)) \ |
| 556 | list_for_each_entry((sibling), &(event)->sibling_list, sibling_list) |
| 557 | |
| 558 | /** |
| 559 | * struct perf_event - performance event kernel representation: |
| 560 | */ |
| 561 | struct perf_event { |
| 562 | #ifdef CONFIG_PERF_EVENTS |
| 563 | /* |
| 564 | * entry onto perf_event_context::event_list; |
| 565 | * modifications require ctx->lock |
| 566 | * RCU safe iterations. |
| 567 | */ |
| 568 | struct list_head event_entry; |
| 569 | |
| 570 | /* |
| 571 | * Locked for modification by both ctx->mutex and ctx->lock; holding |
| 572 | * either sufficies for read. |
| 573 | */ |
| 574 | struct list_head sibling_list; |
| 575 | struct list_head active_list; |
| 576 | /* |
| 577 | * Node on the pinned or flexible tree located at the event context; |
| 578 | */ |
| 579 | struct rb_node group_node; |
| 580 | u64 group_index; |
| 581 | /* |
| 582 | * We need storage to track the entries in perf_pmu_migrate_context; we |
| 583 | * cannot use the event_entry because of RCU and we want to keep the |
| 584 | * group in tact which avoids us using the other two entries. |
| 585 | */ |
| 586 | struct list_head migrate_entry; |
| 587 | |
| 588 | struct hlist_node hlist_entry; |
| 589 | struct list_head active_entry; |
| 590 | int nr_siblings; |
| 591 | |
| 592 | /* Not serialized. Only written during event initialization. */ |
| 593 | int event_caps; |
| 594 | /* The cumulative AND of all event_caps for events in this group. */ |
| 595 | int group_caps; |
| 596 | |
| 597 | struct perf_event *group_leader; |
| 598 | struct pmu *pmu; |
| 599 | void *pmu_private; |
| 600 | |
| 601 | enum perf_event_state state; |
| 602 | unsigned int attach_state; |
| 603 | local64_t count; |
| 604 | atomic64_t child_count; |
| 605 | |
| 606 | /* |
| 607 | * These are the total time in nanoseconds that the event |
| 608 | * has been enabled (i.e. eligible to run, and the task has |
| 609 | * been scheduled in, if this is a per-task event) |
| 610 | * and running (scheduled onto the CPU), respectively. |
| 611 | */ |
| 612 | u64 total_time_enabled; |
| 613 | u64 total_time_running; |
| 614 | u64 tstamp; |
| 615 | |
| 616 | /* |
| 617 | * timestamp shadows the actual context timing but it can |
| 618 | * be safely used in NMI interrupt context. It reflects the |
| 619 | * context time as it was when the event was last scheduled in. |
| 620 | * |
| 621 | * ctx_time already accounts for ctx->timestamp. Therefore to |
| 622 | * compute ctx_time for a sample, simply add perf_clock(). |
| 623 | */ |
| 624 | u64 shadow_ctx_time; |
| 625 | |
| 626 | struct perf_event_attr attr; |
| 627 | u16 header_size; |
| 628 | u16 id_header_size; |
| 629 | u16 read_size; |
| 630 | struct hw_perf_event hw; |
| 631 | |
| 632 | struct perf_event_context *ctx; |
| 633 | atomic_long_t refcount; |
| 634 | |
| 635 | /* |
| 636 | * These accumulate total time (in nanoseconds) that children |
| 637 | * events have been enabled and running, respectively. |
| 638 | */ |
| 639 | atomic64_t child_total_time_enabled; |
| 640 | atomic64_t child_total_time_running; |
| 641 | |
| 642 | /* |
| 643 | * Protect attach/detach and child_list: |
| 644 | */ |
| 645 | struct mutex child_mutex; |
| 646 | struct list_head child_list; |
| 647 | struct perf_event *parent; |
| 648 | |
| 649 | int oncpu; |
| 650 | int cpu; |
| 651 | |
| 652 | struct list_head owner_entry; |
| 653 | struct task_struct *owner; |
| 654 | |
| 655 | /* mmap bits */ |
| 656 | struct mutex mmap_mutex; |
| 657 | atomic_t mmap_count; |
| 658 | |
| 659 | struct ring_buffer *rb; |
| 660 | struct list_head rb_entry; |
| 661 | unsigned long rcu_batches; |
| 662 | int rcu_pending; |
| 663 | |
| 664 | /* poll related */ |
| 665 | wait_queue_head_t waitq; |
| 666 | struct fasync_struct *fasync; |
| 667 | |
| 668 | /* delayed work for NMIs and such */ |
| 669 | int pending_wakeup; |
| 670 | int pending_kill; |
| 671 | int pending_disable; |
| 672 | struct irq_work pending; |
| 673 | |
| 674 | atomic_t event_limit; |
| 675 | |
| 676 | /* address range filters */ |
| 677 | struct perf_addr_filters_head addr_filters; |
| 678 | /* vma address array for file-based filders */ |
| 679 | struct perf_addr_filter_range *addr_filter_ranges; |
| 680 | unsigned long addr_filters_gen; |
| 681 | |
| 682 | void (*destroy)(struct perf_event *); |
| 683 | struct rcu_head rcu_head; |
| 684 | |
| 685 | struct pid_namespace *ns; |
| 686 | u64 id; |
| 687 | |
| 688 | u64 (*clock)(void); |
| 689 | perf_overflow_handler_t overflow_handler; |
| 690 | void *overflow_handler_context; |
| 691 | #ifdef CONFIG_BPF_SYSCALL |
| 692 | perf_overflow_handler_t orig_overflow_handler; |
| 693 | struct bpf_prog *prog; |
| 694 | #endif |
| 695 | |
| 696 | #ifdef CONFIG_EVENT_TRACING |
| 697 | struct trace_event_call *tp_event; |
| 698 | struct event_filter *filter; |
| 699 | #ifdef CONFIG_FUNCTION_TRACER |
| 700 | struct ftrace_ops ftrace_ops; |
| 701 | #endif |
| 702 | #endif |
| 703 | |
| 704 | #ifdef CONFIG_CGROUP_PERF |
| 705 | struct perf_cgroup *cgrp; /* cgroup event is attach to */ |
| 706 | #endif |
| 707 | |
| 708 | struct list_head sb_list; |
| 709 | #endif /* CONFIG_PERF_EVENTS */ |
| 710 | }; |
| 711 | |
| 712 | |
| 713 | struct perf_event_groups { |
| 714 | struct rb_root tree; |
| 715 | u64 index; |
| 716 | }; |
| 717 | |
| 718 | /** |
| 719 | * struct perf_event_context - event context structure |
| 720 | * |
| 721 | * Used as a container for task events and CPU events as well: |
| 722 | */ |
| 723 | struct perf_event_context { |
| 724 | struct pmu *pmu; |
| 725 | /* |
| 726 | * Protect the states of the events in the list, |
| 727 | * nr_active, and the list: |
| 728 | */ |
| 729 | raw_spinlock_t lock; |
| 730 | /* |
| 731 | * Protect the list of events. Locking either mutex or lock |
| 732 | * is sufficient to ensure the list doesn't change; to change |
| 733 | * the list you need to lock both the mutex and the spinlock. |
| 734 | */ |
| 735 | struct mutex mutex; |
| 736 | |
| 737 | struct list_head active_ctx_list; |
| 738 | struct perf_event_groups pinned_groups; |
| 739 | struct perf_event_groups flexible_groups; |
| 740 | struct list_head event_list; |
| 741 | |
| 742 | struct list_head pinned_active; |
| 743 | struct list_head flexible_active; |
| 744 | |
| 745 | int nr_events; |
| 746 | int nr_active; |
| 747 | int is_active; |
| 748 | int nr_stat; |
| 749 | int nr_freq; |
| 750 | int rotate_disable; |
| 751 | refcount_t refcount; |
| 752 | struct task_struct *task; |
| 753 | |
| 754 | /* |
| 755 | * Context clock, runs when context enabled. |
| 756 | */ |
| 757 | u64 time; |
| 758 | u64 timestamp; |
| 759 | |
| 760 | /* |
| 761 | * These fields let us detect when two contexts have both |
| 762 | * been cloned (inherited) from a common ancestor. |
| 763 | */ |
| 764 | struct perf_event_context *parent_ctx; |
| 765 | u64 parent_gen; |
| 766 | u64 generation; |
| 767 | int pin_count; |
| 768 | #ifdef CONFIG_CGROUP_PERF |
| 769 | int nr_cgroups; /* cgroup evts */ |
| 770 | #endif |
| 771 | void *task_ctx_data; /* pmu specific data */ |
| 772 | struct rcu_head rcu_head; |
| 773 | }; |
| 774 | |
| 775 | /* |
| 776 | * Number of contexts where an event can trigger: |
| 777 | * task, softirq, hardirq, nmi. |
| 778 | */ |
| 779 | #define PERF_NR_CONTEXTS 4 |
| 780 | |
| 781 | /** |
| 782 | * struct perf_event_cpu_context - per cpu event context structure |
| 783 | */ |
| 784 | struct perf_cpu_context { |
| 785 | struct perf_event_context ctx; |
| 786 | struct perf_event_context *task_ctx; |
| 787 | int active_oncpu; |
| 788 | int exclusive; |
| 789 | |
| 790 | raw_spinlock_t hrtimer_lock; |
| 791 | struct hrtimer hrtimer; |
| 792 | ktime_t hrtimer_interval; |
| 793 | unsigned int hrtimer_active; |
| 794 | |
| 795 | #ifdef CONFIG_CGROUP_PERF |
| 796 | struct perf_cgroup *cgrp; |
| 797 | struct list_head cgrp_cpuctx_entry; |
| 798 | #endif |
| 799 | |
| 800 | struct list_head sched_cb_entry; |
| 801 | int sched_cb_usage; |
| 802 | |
| 803 | int online; |
| 804 | }; |
| 805 | |
| 806 | struct perf_output_handle { |
| 807 | struct perf_event *event; |
| 808 | struct ring_buffer *rb; |
| 809 | unsigned long wakeup; |
| 810 | unsigned long size; |
| 811 | u64 aux_flags; |
| 812 | union { |
| 813 | void *addr; |
| 814 | unsigned long head; |
| 815 | }; |
| 816 | int page; |
| 817 | }; |
| 818 | |
| 819 | struct bpf_perf_event_data_kern { |
| 820 | bpf_user_pt_regs_t *regs; |
| 821 | struct perf_sample_data *data; |
| 822 | struct perf_event *event; |
| 823 | }; |
| 824 | |
| 825 | #ifdef CONFIG_CGROUP_PERF |
| 826 | |
| 827 | /* |
| 828 | * perf_cgroup_info keeps track of time_enabled for a cgroup. |
| 829 | * This is a per-cpu dynamically allocated data structure. |
| 830 | */ |
| 831 | struct perf_cgroup_info { |
| 832 | u64 time; |
| 833 | u64 timestamp; |
| 834 | }; |
| 835 | |
| 836 | struct perf_cgroup { |
| 837 | struct cgroup_subsys_state css; |
| 838 | struct perf_cgroup_info __percpu *info; |
| 839 | }; |
| 840 | |
| 841 | /* |
| 842 | * Must ensure cgroup is pinned (css_get) before calling |
| 843 | * this function. In other words, we cannot call this function |
| 844 | * if there is no cgroup event for the current CPU context. |
| 845 | */ |
| 846 | static inline struct perf_cgroup * |
| 847 | perf_cgroup_from_task(struct task_struct *task, struct perf_event_context *ctx) |
| 848 | { |
| 849 | return container_of(task_css_check(task, perf_event_cgrp_id, |
| 850 | ctx ? lockdep_is_held(&ctx->lock) |
| 851 | : true), |
| 852 | struct perf_cgroup, css); |
| 853 | } |
| 854 | #endif /* CONFIG_CGROUP_PERF */ |
| 855 | |
| 856 | #ifdef CONFIG_PERF_EVENTS |
| 857 | |
| 858 | extern void *perf_aux_output_begin(struct perf_output_handle *handle, |
| 859 | struct perf_event *event); |
| 860 | extern void perf_aux_output_end(struct perf_output_handle *handle, |
| 861 | unsigned long size); |
| 862 | extern int perf_aux_output_skip(struct perf_output_handle *handle, |
| 863 | unsigned long size); |
| 864 | extern void *perf_get_aux(struct perf_output_handle *handle); |
| 865 | extern void perf_aux_output_flag(struct perf_output_handle *handle, u64 flags); |
| 866 | extern void perf_event_itrace_started(struct perf_event *event); |
| 867 | |
| 868 | extern int perf_pmu_register(struct pmu *pmu, const char *name, int type); |
| 869 | extern void perf_pmu_unregister(struct pmu *pmu); |
| 870 | |
| 871 | extern int perf_num_counters(void); |
| 872 | extern const char *perf_pmu_name(void); |
| 873 | extern void __perf_event_task_sched_in(struct task_struct *prev, |
| 874 | struct task_struct *task); |
| 875 | extern void __perf_event_task_sched_out(struct task_struct *prev, |
| 876 | struct task_struct *next); |
| 877 | extern int perf_event_init_task(struct task_struct *child); |
| 878 | extern void perf_event_exit_task(struct task_struct *child); |
| 879 | extern void perf_event_free_task(struct task_struct *task); |
| 880 | extern void perf_event_delayed_put(struct task_struct *task); |
| 881 | extern struct file *perf_event_get(unsigned int fd); |
| 882 | extern const struct perf_event *perf_get_event(struct file *file); |
| 883 | extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event); |
| 884 | extern void perf_event_print_debug(void); |
| 885 | extern void perf_pmu_disable(struct pmu *pmu); |
| 886 | extern void perf_pmu_enable(struct pmu *pmu); |
| 887 | extern void perf_sched_cb_dec(struct pmu *pmu); |
| 888 | extern void perf_sched_cb_inc(struct pmu *pmu); |
| 889 | extern int perf_event_task_disable(void); |
| 890 | extern int perf_event_task_enable(void); |
| 891 | extern int perf_event_refresh(struct perf_event *event, int refresh); |
| 892 | extern void perf_event_update_userpage(struct perf_event *event); |
| 893 | extern int perf_event_release_kernel(struct perf_event *event); |
| 894 | extern struct perf_event * |
| 895 | perf_event_create_kernel_counter(struct perf_event_attr *attr, |
| 896 | int cpu, |
| 897 | struct task_struct *task, |
| 898 | perf_overflow_handler_t callback, |
| 899 | void *context); |
| 900 | extern void perf_pmu_migrate_context(struct pmu *pmu, |
| 901 | int src_cpu, int dst_cpu); |
| 902 | int perf_event_read_local(struct perf_event *event, u64 *value, |
| 903 | u64 *enabled, u64 *running); |
| 904 | extern u64 perf_event_read_value(struct perf_event *event, |
| 905 | u64 *enabled, u64 *running); |
| 906 | |
| 907 | |
| 908 | struct perf_sample_data { |
| 909 | /* |
| 910 | * Fields set by perf_sample_data_init(), group so as to |
| 911 | * minimize the cachelines touched. |
| 912 | */ |
| 913 | u64 addr; |
| 914 | struct perf_raw_record *raw; |
| 915 | struct perf_branch_stack *br_stack; |
| 916 | u64 period; |
| 917 | u64 weight; |
| 918 | u64 txn; |
| 919 | union perf_mem_data_src data_src; |
| 920 | |
| 921 | /* |
| 922 | * The other fields, optionally {set,used} by |
| 923 | * perf_{prepare,output}_sample(). |
| 924 | */ |
| 925 | u64 type; |
| 926 | u64 ip; |
| 927 | struct { |
| 928 | u32 pid; |
| 929 | u32 tid; |
| 930 | } tid_entry; |
| 931 | u64 time; |
| 932 | u64 id; |
| 933 | u64 stream_id; |
| 934 | struct { |
| 935 | u32 cpu; |
| 936 | u32 reserved; |
| 937 | } cpu_entry; |
| 938 | struct perf_callchain_entry *callchain; |
| 939 | |
| 940 | /* |
| 941 | * regs_user may point to task_pt_regs or to regs_user_copy, depending |
| 942 | * on arch details. |
| 943 | */ |
| 944 | struct perf_regs regs_user; |
| 945 | struct pt_regs regs_user_copy; |
| 946 | |
| 947 | struct perf_regs regs_intr; |
| 948 | u64 stack_user_size; |
| 949 | |
| 950 | u64 phys_addr; |
| 951 | } ____cacheline_aligned; |
| 952 | |
| 953 | /* default value for data source */ |
| 954 | #define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\ |
| 955 | PERF_MEM_S(LVL, NA) |\ |
| 956 | PERF_MEM_S(SNOOP, NA) |\ |
| 957 | PERF_MEM_S(LOCK, NA) |\ |
| 958 | PERF_MEM_S(TLB, NA)) |
| 959 | |
| 960 | static inline void perf_sample_data_init(struct perf_sample_data *data, |
| 961 | u64 addr, u64 period) |
| 962 | { |
| 963 | /* remaining struct members initialized in perf_prepare_sample() */ |
| 964 | data->addr = addr; |
| 965 | data->raw = NULL; |
| 966 | data->br_stack = NULL; |
| 967 | data->period = period; |
| 968 | data->weight = 0; |
| 969 | data->data_src.val = PERF_MEM_NA; |
| 970 | data->txn = 0; |
| 971 | } |
| 972 | |
| 973 | extern void perf_output_sample(struct perf_output_handle *handle, |
| 974 | struct perf_event_header *header, |
| 975 | struct perf_sample_data *data, |
| 976 | struct perf_event *event); |
| 977 | extern void perf_prepare_sample(struct perf_event_header *header, |
| 978 | struct perf_sample_data *data, |
| 979 | struct perf_event *event, |
| 980 | struct pt_regs *regs); |
| 981 | |
| 982 | extern int perf_event_overflow(struct perf_event *event, |
| 983 | struct perf_sample_data *data, |
| 984 | struct pt_regs *regs); |
| 985 | |
| 986 | extern void perf_event_output_forward(struct perf_event *event, |
| 987 | struct perf_sample_data *data, |
| 988 | struct pt_regs *regs); |
| 989 | extern void perf_event_output_backward(struct perf_event *event, |
| 990 | struct perf_sample_data *data, |
| 991 | struct pt_regs *regs); |
| 992 | extern int perf_event_output(struct perf_event *event, |
| 993 | struct perf_sample_data *data, |
| 994 | struct pt_regs *regs); |
| 995 | |
| 996 | static inline bool |
| 997 | is_default_overflow_handler(struct perf_event *event) |
| 998 | { |
| 999 | if (likely(event->overflow_handler == perf_event_output_forward)) |
| 1000 | return true; |
| 1001 | if (unlikely(event->overflow_handler == perf_event_output_backward)) |
| 1002 | return true; |
| 1003 | return false; |
| 1004 | } |
| 1005 | |
| 1006 | extern void |
| 1007 | perf_event_header__init_id(struct perf_event_header *header, |
| 1008 | struct perf_sample_data *data, |
| 1009 | struct perf_event *event); |
| 1010 | extern void |
| 1011 | perf_event__output_id_sample(struct perf_event *event, |
| 1012 | struct perf_output_handle *handle, |
| 1013 | struct perf_sample_data *sample); |
| 1014 | |
| 1015 | extern void |
| 1016 | perf_log_lost_samples(struct perf_event *event, u64 lost); |
| 1017 | |
| 1018 | static inline bool event_has_any_exclude_flag(struct perf_event *event) |
| 1019 | { |
| 1020 | struct perf_event_attr *attr = &event->attr; |
| 1021 | |
| 1022 | return attr->exclude_idle || attr->exclude_user || |
| 1023 | attr->exclude_kernel || attr->exclude_hv || |
| 1024 | attr->exclude_guest || attr->exclude_host; |
| 1025 | } |
| 1026 | |
| 1027 | static inline bool is_sampling_event(struct perf_event *event) |
| 1028 | { |
| 1029 | return event->attr.sample_period != 0; |
| 1030 | } |
| 1031 | |
| 1032 | /* |
| 1033 | * Return 1 for a software event, 0 for a hardware event |
| 1034 | */ |
| 1035 | static inline int is_software_event(struct perf_event *event) |
| 1036 | { |
| 1037 | return event->event_caps & PERF_EV_CAP_SOFTWARE; |
| 1038 | } |
| 1039 | |
| 1040 | /* |
| 1041 | * Return 1 for event in sw context, 0 for event in hw context |
| 1042 | */ |
| 1043 | static inline int in_software_context(struct perf_event *event) |
| 1044 | { |
| 1045 | return event->ctx->pmu->task_ctx_nr == perf_sw_context; |
| 1046 | } |
| 1047 | |
| 1048 | extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX]; |
| 1049 | |
| 1050 | extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64); |
| 1051 | extern void __perf_sw_event(u32, u64, struct pt_regs *, u64); |
| 1052 | |
| 1053 | #ifndef perf_arch_fetch_caller_regs |
| 1054 | static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { } |
| 1055 | #endif |
| 1056 | |
| 1057 | /* |
| 1058 | * Take a snapshot of the regs. Skip ip and frame pointer to |
| 1059 | * the nth caller. We only need a few of the regs: |
| 1060 | * - ip for PERF_SAMPLE_IP |
| 1061 | * - cs for user_mode() tests |
| 1062 | * - bp for callchains |
| 1063 | * - eflags, for future purposes, just in case |
| 1064 | */ |
| 1065 | static inline void perf_fetch_caller_regs(struct pt_regs *regs) |
| 1066 | { |
| 1067 | perf_arch_fetch_caller_regs(regs, CALLER_ADDR0); |
| 1068 | } |
| 1069 | |
| 1070 | static __always_inline void |
| 1071 | perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) |
| 1072 | { |
| 1073 | if (static_key_false(&perf_swevent_enabled[event_id])) |
| 1074 | __perf_sw_event(event_id, nr, regs, addr); |
| 1075 | } |
| 1076 | |
| 1077 | DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]); |
| 1078 | |
| 1079 | /* |
| 1080 | * 'Special' version for the scheduler, it hard assumes no recursion, |
| 1081 | * which is guaranteed by us not actually scheduling inside other swevents |
| 1082 | * because those disable preemption. |
| 1083 | */ |
| 1084 | static __always_inline void |
| 1085 | perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) |
| 1086 | { |
| 1087 | if (static_key_false(&perf_swevent_enabled[event_id])) { |
| 1088 | struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]); |
| 1089 | |
| 1090 | perf_fetch_caller_regs(regs); |
| 1091 | ___perf_sw_event(event_id, nr, regs, addr); |
| 1092 | } |
| 1093 | } |
| 1094 | |
| 1095 | extern struct static_key_false perf_sched_events; |
| 1096 | |
| 1097 | static __always_inline bool |
| 1098 | perf_sw_migrate_enabled(void) |
| 1099 | { |
| 1100 | if (static_key_false(&perf_swevent_enabled[PERF_COUNT_SW_CPU_MIGRATIONS])) |
| 1101 | return true; |
| 1102 | return false; |
| 1103 | } |
| 1104 | |
| 1105 | static inline void perf_event_task_migrate(struct task_struct *task) |
| 1106 | { |
| 1107 | if (perf_sw_migrate_enabled()) |
| 1108 | task->sched_migrated = 1; |
| 1109 | } |
| 1110 | |
| 1111 | static inline void perf_event_task_sched_in(struct task_struct *prev, |
| 1112 | struct task_struct *task) |
| 1113 | { |
| 1114 | if (static_branch_unlikely(&perf_sched_events)) |
| 1115 | __perf_event_task_sched_in(prev, task); |
| 1116 | |
| 1117 | if (perf_sw_migrate_enabled() && task->sched_migrated) { |
| 1118 | struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]); |
| 1119 | |
| 1120 | perf_fetch_caller_regs(regs); |
| 1121 | ___perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, regs, 0); |
| 1122 | task->sched_migrated = 0; |
| 1123 | } |
| 1124 | } |
| 1125 | |
| 1126 | static inline void perf_event_task_sched_out(struct task_struct *prev, |
| 1127 | struct task_struct *next) |
| 1128 | { |
| 1129 | perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0); |
| 1130 | |
| 1131 | if (static_branch_unlikely(&perf_sched_events)) |
| 1132 | __perf_event_task_sched_out(prev, next); |
| 1133 | } |
| 1134 | |
| 1135 | extern void perf_event_mmap(struct vm_area_struct *vma); |
| 1136 | |
| 1137 | extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, |
| 1138 | bool unregister, const char *sym); |
| 1139 | extern void perf_event_bpf_event(struct bpf_prog *prog, |
| 1140 | enum perf_bpf_event_type type, |
| 1141 | u16 flags); |
| 1142 | |
| 1143 | extern struct perf_guest_info_callbacks *perf_guest_cbs; |
| 1144 | extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks); |
| 1145 | extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks); |
| 1146 | |
| 1147 | extern void perf_event_exec(void); |
| 1148 | extern void perf_event_comm(struct task_struct *tsk, bool exec); |
| 1149 | extern void perf_event_namespaces(struct task_struct *tsk); |
| 1150 | extern void perf_event_fork(struct task_struct *tsk); |
| 1151 | |
| 1152 | /* Callchains */ |
| 1153 | DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry); |
| 1154 | |
| 1155 | extern void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); |
| 1156 | extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); |
| 1157 | extern struct perf_callchain_entry * |
| 1158 | get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user, |
| 1159 | u32 max_stack, bool crosstask, bool add_mark); |
| 1160 | extern struct perf_callchain_entry *perf_callchain(struct perf_event *event, struct pt_regs *regs); |
| 1161 | extern int get_callchain_buffers(int max_stack); |
| 1162 | extern void put_callchain_buffers(void); |
| 1163 | |
| 1164 | extern int sysctl_perf_event_max_stack; |
| 1165 | extern int sysctl_perf_event_max_contexts_per_stack; |
| 1166 | |
| 1167 | static inline int perf_callchain_store_context(struct perf_callchain_entry_ctx *ctx, u64 ip) |
| 1168 | { |
| 1169 | if (ctx->contexts < sysctl_perf_event_max_contexts_per_stack) { |
| 1170 | struct perf_callchain_entry *entry = ctx->entry; |
| 1171 | entry->ip[entry->nr++] = ip; |
| 1172 | ++ctx->contexts; |
| 1173 | return 0; |
| 1174 | } else { |
| 1175 | ctx->contexts_maxed = true; |
| 1176 | return -1; /* no more room, stop walking the stack */ |
| 1177 | } |
| 1178 | } |
| 1179 | |
| 1180 | static inline int perf_callchain_store(struct perf_callchain_entry_ctx *ctx, u64 ip) |
| 1181 | { |
| 1182 | if (ctx->nr < ctx->max_stack && !ctx->contexts_maxed) { |
| 1183 | struct perf_callchain_entry *entry = ctx->entry; |
| 1184 | entry->ip[entry->nr++] = ip; |
| 1185 | ++ctx->nr; |
| 1186 | return 0; |
| 1187 | } else { |
| 1188 | return -1; /* no more room, stop walking the stack */ |
| 1189 | } |
| 1190 | } |
| 1191 | |
| 1192 | extern int sysctl_perf_event_paranoid; |
| 1193 | extern int sysctl_perf_event_mlock; |
| 1194 | extern int sysctl_perf_event_sample_rate; |
| 1195 | extern int sysctl_perf_cpu_time_max_percent; |
| 1196 | |
| 1197 | extern void perf_sample_event_took(u64 sample_len_ns); |
| 1198 | |
| 1199 | extern int perf_proc_update_handler(struct ctl_table *table, int write, |
| 1200 | void __user *buffer, size_t *lenp, |
| 1201 | loff_t *ppos); |
| 1202 | extern int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write, |
| 1203 | void __user *buffer, size_t *lenp, |
| 1204 | loff_t *ppos); |
| 1205 | |
| 1206 | int perf_event_max_stack_handler(struct ctl_table *table, int write, |
| 1207 | void __user *buffer, size_t *lenp, loff_t *ppos); |
| 1208 | |
| 1209 | static inline bool perf_paranoid_tracepoint_raw(void) |
| 1210 | { |
| 1211 | return sysctl_perf_event_paranoid > -1; |
| 1212 | } |
| 1213 | |
| 1214 | static inline bool perf_paranoid_cpu(void) |
| 1215 | { |
| 1216 | return sysctl_perf_event_paranoid > 0; |
| 1217 | } |
| 1218 | |
| 1219 | static inline bool perf_paranoid_kernel(void) |
| 1220 | { |
| 1221 | return sysctl_perf_event_paranoid > 1; |
| 1222 | } |
| 1223 | |
| 1224 | extern void perf_event_init(void); |
| 1225 | extern void perf_tp_event(u16 event_type, u64 count, void *record, |
| 1226 | int entry_size, struct pt_regs *regs, |
| 1227 | struct hlist_head *head, int rctx, |
| 1228 | struct task_struct *task); |
| 1229 | extern void perf_bp_event(struct perf_event *event, void *data); |
| 1230 | |
| 1231 | #ifndef perf_misc_flags |
| 1232 | # define perf_misc_flags(regs) \ |
| 1233 | (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL) |
| 1234 | # define perf_instruction_pointer(regs) instruction_pointer(regs) |
| 1235 | #endif |
| 1236 | #ifndef perf_arch_bpf_user_pt_regs |
| 1237 | # define perf_arch_bpf_user_pt_regs(regs) regs |
| 1238 | #endif |
| 1239 | |
| 1240 | static inline bool has_branch_stack(struct perf_event *event) |
| 1241 | { |
| 1242 | return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK; |
| 1243 | } |
| 1244 | |
| 1245 | static inline bool needs_branch_stack(struct perf_event *event) |
| 1246 | { |
| 1247 | return event->attr.branch_sample_type != 0; |
| 1248 | } |
| 1249 | |
| 1250 | static inline bool has_aux(struct perf_event *event) |
| 1251 | { |
| 1252 | return event->pmu->setup_aux; |
| 1253 | } |
| 1254 | |
| 1255 | static inline bool is_write_backward(struct perf_event *event) |
| 1256 | { |
| 1257 | return !!event->attr.write_backward; |
| 1258 | } |
| 1259 | |
| 1260 | static inline bool has_addr_filter(struct perf_event *event) |
| 1261 | { |
| 1262 | return event->pmu->nr_addr_filters; |
| 1263 | } |
| 1264 | |
| 1265 | /* |
| 1266 | * An inherited event uses parent's filters |
| 1267 | */ |
| 1268 | static inline struct perf_addr_filters_head * |
| 1269 | perf_event_addr_filters(struct perf_event *event) |
| 1270 | { |
| 1271 | struct perf_addr_filters_head *ifh = &event->addr_filters; |
| 1272 | |
| 1273 | if (event->parent) |
| 1274 | ifh = &event->parent->addr_filters; |
| 1275 | |
| 1276 | return ifh; |
| 1277 | } |
| 1278 | |
| 1279 | extern void perf_event_addr_filters_sync(struct perf_event *event); |
| 1280 | |
| 1281 | extern int perf_output_begin(struct perf_output_handle *handle, |
| 1282 | struct perf_event *event, unsigned int size); |
| 1283 | extern int perf_output_begin_forward(struct perf_output_handle *handle, |
| 1284 | struct perf_event *event, |
| 1285 | unsigned int size); |
| 1286 | extern int perf_output_begin_backward(struct perf_output_handle *handle, |
| 1287 | struct perf_event *event, |
| 1288 | unsigned int size); |
| 1289 | |
| 1290 | extern void perf_output_end(struct perf_output_handle *handle); |
| 1291 | extern unsigned int perf_output_copy(struct perf_output_handle *handle, |
| 1292 | const void *buf, unsigned int len); |
| 1293 | extern unsigned int perf_output_skip(struct perf_output_handle *handle, |
| 1294 | unsigned int len); |
| 1295 | extern int perf_swevent_get_recursion_context(void); |
| 1296 | extern void perf_swevent_put_recursion_context(int rctx); |
| 1297 | extern u64 perf_swevent_set_period(struct perf_event *event); |
| 1298 | extern void perf_event_enable(struct perf_event *event); |
| 1299 | extern void perf_event_disable(struct perf_event *event); |
| 1300 | extern void perf_event_disable_local(struct perf_event *event); |
| 1301 | extern void perf_event_disable_inatomic(struct perf_event *event); |
| 1302 | extern void perf_event_task_tick(void); |
| 1303 | extern int perf_event_account_interrupt(struct perf_event *event); |
| 1304 | #else /* !CONFIG_PERF_EVENTS: */ |
| 1305 | static inline void * |
| 1306 | perf_aux_output_begin(struct perf_output_handle *handle, |
| 1307 | struct perf_event *event) { return NULL; } |
| 1308 | static inline void |
| 1309 | perf_aux_output_end(struct perf_output_handle *handle, unsigned long size) |
| 1310 | { } |
| 1311 | static inline int |
| 1312 | perf_aux_output_skip(struct perf_output_handle *handle, |
| 1313 | unsigned long size) { return -EINVAL; } |
| 1314 | static inline void * |
| 1315 | perf_get_aux(struct perf_output_handle *handle) { return NULL; } |
| 1316 | static inline void |
| 1317 | perf_event_task_migrate(struct task_struct *task) { } |
| 1318 | static inline void |
| 1319 | perf_event_task_sched_in(struct task_struct *prev, |
| 1320 | struct task_struct *task) { } |
| 1321 | static inline void |
| 1322 | perf_event_task_sched_out(struct task_struct *prev, |
| 1323 | struct task_struct *next) { } |
| 1324 | static inline int perf_event_init_task(struct task_struct *child) { return 0; } |
| 1325 | static inline void perf_event_exit_task(struct task_struct *child) { } |
| 1326 | static inline void perf_event_free_task(struct task_struct *task) { } |
| 1327 | static inline void perf_event_delayed_put(struct task_struct *task) { } |
| 1328 | static inline struct file *perf_event_get(unsigned int fd) { return ERR_PTR(-EINVAL); } |
| 1329 | static inline const struct perf_event *perf_get_event(struct file *file) |
| 1330 | { |
| 1331 | return ERR_PTR(-EINVAL); |
| 1332 | } |
| 1333 | static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event) |
| 1334 | { |
| 1335 | return ERR_PTR(-EINVAL); |
| 1336 | } |
| 1337 | static inline int perf_event_read_local(struct perf_event *event, u64 *value, |
| 1338 | u64 *enabled, u64 *running) |
| 1339 | { |
| 1340 | return -EINVAL; |
| 1341 | } |
| 1342 | static inline void perf_event_print_debug(void) { } |
| 1343 | static inline int perf_event_task_disable(void) { return -EINVAL; } |
| 1344 | static inline int perf_event_task_enable(void) { return -EINVAL; } |
| 1345 | static inline int perf_event_refresh(struct perf_event *event, int refresh) |
| 1346 | { |
| 1347 | return -EINVAL; |
| 1348 | } |
| 1349 | |
| 1350 | static inline void |
| 1351 | perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { } |
| 1352 | static inline void |
| 1353 | perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) { } |
| 1354 | static inline void |
| 1355 | perf_bp_event(struct perf_event *event, void *data) { } |
| 1356 | |
| 1357 | static inline int perf_register_guest_info_callbacks |
| 1358 | (struct perf_guest_info_callbacks *callbacks) { return 0; } |
| 1359 | static inline int perf_unregister_guest_info_callbacks |
| 1360 | (struct perf_guest_info_callbacks *callbacks) { return 0; } |
| 1361 | |
| 1362 | static inline void perf_event_mmap(struct vm_area_struct *vma) { } |
| 1363 | |
| 1364 | typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data); |
| 1365 | static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, |
| 1366 | bool unregister, const char *sym) { } |
| 1367 | static inline void perf_event_bpf_event(struct bpf_prog *prog, |
| 1368 | enum perf_bpf_event_type type, |
| 1369 | u16 flags) { } |
| 1370 | static inline void perf_event_exec(void) { } |
| 1371 | static inline void perf_event_comm(struct task_struct *tsk, bool exec) { } |
| 1372 | static inline void perf_event_namespaces(struct task_struct *tsk) { } |
| 1373 | static inline void perf_event_fork(struct task_struct *tsk) { } |
| 1374 | static inline void perf_event_init(void) { } |
| 1375 | static inline int perf_swevent_get_recursion_context(void) { return -1; } |
| 1376 | static inline void perf_swevent_put_recursion_context(int rctx) { } |
| 1377 | static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; } |
| 1378 | static inline void perf_event_enable(struct perf_event *event) { } |
| 1379 | static inline void perf_event_disable(struct perf_event *event) { } |
| 1380 | static inline int __perf_event_disable(void *info) { return -1; } |
| 1381 | static inline void perf_event_task_tick(void) { } |
| 1382 | static inline int perf_event_release_kernel(struct perf_event *event) { return 0; } |
| 1383 | #endif |
| 1384 | |
| 1385 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL) |
| 1386 | extern void perf_restore_debug_store(void); |
| 1387 | #else |
| 1388 | static inline void perf_restore_debug_store(void) { } |
| 1389 | #endif |
| 1390 | |
| 1391 | static __always_inline bool perf_raw_frag_last(const struct perf_raw_frag *frag) |
| 1392 | { |
| 1393 | return frag->pad < sizeof(u64); |
| 1394 | } |
| 1395 | |
| 1396 | #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x)) |
| 1397 | |
| 1398 | struct perf_pmu_events_attr { |
| 1399 | struct device_attribute attr; |
| 1400 | u64 id; |
| 1401 | const char *event_str; |
| 1402 | }; |
| 1403 | |
| 1404 | struct perf_pmu_events_ht_attr { |
| 1405 | struct device_attribute attr; |
| 1406 | u64 id; |
| 1407 | const char *event_str_ht; |
| 1408 | const char *event_str_noht; |
| 1409 | }; |
| 1410 | |
| 1411 | ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr, |
| 1412 | char *page); |
| 1413 | |
| 1414 | #define PMU_EVENT_ATTR(_name, _var, _id, _show) \ |
| 1415 | static struct perf_pmu_events_attr _var = { \ |
| 1416 | .attr = __ATTR(_name, 0444, _show, NULL), \ |
| 1417 | .id = _id, \ |
| 1418 | }; |
| 1419 | |
| 1420 | #define PMU_EVENT_ATTR_STRING(_name, _var, _str) \ |
| 1421 | static struct perf_pmu_events_attr _var = { \ |
| 1422 | .attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \ |
| 1423 | .id = 0, \ |
| 1424 | .event_str = _str, \ |
| 1425 | }; |
| 1426 | |
| 1427 | #define PMU_FORMAT_ATTR(_name, _format) \ |
| 1428 | static ssize_t \ |
| 1429 | _name##_show(struct device *dev, \ |
| 1430 | struct device_attribute *attr, \ |
| 1431 | char *page) \ |
| 1432 | { \ |
| 1433 | BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \ |
| 1434 | return sprintf(page, _format "\n"); \ |
| 1435 | } \ |
| 1436 | \ |
| 1437 | static struct device_attribute format_attr_##_name = __ATTR_RO(_name) |
| 1438 | |
| 1439 | /* Performance counter hotplug functions */ |
| 1440 | #ifdef CONFIG_PERF_EVENTS |
| 1441 | int perf_event_init_cpu(unsigned int cpu); |
| 1442 | int perf_event_exit_cpu(unsigned int cpu); |
| 1443 | #else |
| 1444 | #define perf_event_init_cpu NULL |
| 1445 | #define perf_event_exit_cpu NULL |
| 1446 | #endif |
| 1447 | |
| 1448 | #endif /* _LINUX_PERF_EVENT_H */ |