Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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); |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 33 | void (*handle_intel_pt_intr)(void); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 34 | }; |
| 35 | |
| 36 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 37 | #include <asm/hw_breakpoint.h> |
| 38 | #endif |
| 39 | |
| 40 | #include <linux/list.h> |
| 41 | #include <linux/mutex.h> |
| 42 | #include <linux/rculist.h> |
| 43 | #include <linux/rcupdate.h> |
| 44 | #include <linux/spinlock.h> |
| 45 | #include <linux/hrtimer.h> |
| 46 | #include <linux/fs.h> |
| 47 | #include <linux/pid_namespace.h> |
| 48 | #include <linux/workqueue.h> |
| 49 | #include <linux/ftrace.h> |
| 50 | #include <linux/cpu.h> |
| 51 | #include <linux/irq_work.h> |
| 52 | #include <linux/static_key.h> |
| 53 | #include <linux/jump_label_ratelimit.h> |
| 54 | #include <linux/atomic.h> |
| 55 | #include <linux/sysfs.h> |
| 56 | #include <linux/perf_regs.h> |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 57 | #include <linux/cgroup.h> |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 58 | #include <linux/refcount.h> |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 59 | #include <linux/security.h> |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 60 | #include <asm/local.h> |
| 61 | |
| 62 | struct perf_callchain_entry { |
| 63 | __u64 nr; |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 64 | __u64 ip[]; /* /proc/sys/kernel/perf_event_max_stack */ |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 65 | }; |
| 66 | |
| 67 | struct perf_callchain_entry_ctx { |
| 68 | struct perf_callchain_entry *entry; |
| 69 | u32 max_stack; |
| 70 | u32 nr; |
| 71 | short contexts; |
| 72 | bool contexts_maxed; |
| 73 | }; |
| 74 | |
| 75 | typedef unsigned long (*perf_copy_f)(void *dst, const void *src, |
| 76 | unsigned long off, unsigned long len); |
| 77 | |
| 78 | struct perf_raw_frag { |
| 79 | union { |
| 80 | struct perf_raw_frag *next; |
| 81 | unsigned long pad; |
| 82 | }; |
| 83 | perf_copy_f copy; |
| 84 | void *data; |
| 85 | u32 size; |
| 86 | } __packed; |
| 87 | |
| 88 | struct perf_raw_record { |
| 89 | struct perf_raw_frag frag; |
| 90 | u32 size; |
| 91 | }; |
| 92 | |
| 93 | /* |
| 94 | * branch stack layout: |
| 95 | * nr: number of taken branches stored in entries[] |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 96 | * hw_idx: The low level index of raw branch records |
| 97 | * for the most recent branch. |
| 98 | * -1ULL means invalid/unknown. |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 99 | * |
| 100 | * Note that nr can vary from sample to sample |
| 101 | * branches (to, from) are stored from most recent |
| 102 | * to least recent, i.e., entries[0] contains the most |
| 103 | * recent branch. |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 104 | * The entries[] is an abstraction of raw branch records, |
| 105 | * which may not be stored in age order in HW, e.g. Intel LBR. |
| 106 | * The hw_idx is to expose the low level index of raw |
| 107 | * branch record for the most recent branch aka entries[0]. |
| 108 | * The hw_idx index is between -1 (unknown) and max depth, |
| 109 | * which can be retrieved in /sys/devices/cpu/caps/branches. |
| 110 | * For the architectures whose raw branch records are |
| 111 | * already stored in age order, the hw_idx should be 0. |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 112 | */ |
| 113 | struct perf_branch_stack { |
| 114 | __u64 nr; |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 115 | __u64 hw_idx; |
| 116 | struct perf_branch_entry entries[]; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 117 | }; |
| 118 | |
| 119 | struct task_struct; |
| 120 | |
| 121 | /* |
| 122 | * extra PMU register associated with an event |
| 123 | */ |
| 124 | struct hw_perf_event_extra { |
| 125 | u64 config; /* register value */ |
| 126 | unsigned int reg; /* register address or index */ |
| 127 | int alloc; /* extra register already allocated */ |
| 128 | int idx; /* index in shared_regs->regs[] */ |
| 129 | }; |
| 130 | |
| 131 | /** |
| 132 | * struct hw_perf_event - performance event hardware details: |
| 133 | */ |
| 134 | struct hw_perf_event { |
| 135 | #ifdef CONFIG_PERF_EVENTS |
| 136 | union { |
| 137 | struct { /* hardware */ |
| 138 | u64 config; |
| 139 | u64 last_tag; |
| 140 | unsigned long config_base; |
| 141 | unsigned long event_base; |
| 142 | int event_base_rdpmc; |
| 143 | int idx; |
| 144 | int last_cpu; |
| 145 | int flags; |
| 146 | |
| 147 | struct hw_perf_event_extra extra_reg; |
| 148 | struct hw_perf_event_extra branch_reg; |
| 149 | }; |
| 150 | struct { /* software */ |
| 151 | struct hrtimer hrtimer; |
| 152 | }; |
| 153 | struct { /* tracepoint */ |
| 154 | /* for tp_event->class */ |
| 155 | struct list_head tp_list; |
| 156 | }; |
| 157 | struct { /* amd_power */ |
| 158 | u64 pwr_acc; |
| 159 | u64 ptsc; |
| 160 | }; |
| 161 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 162 | struct { /* breakpoint */ |
| 163 | /* |
| 164 | * Crufty hack to avoid the chicken and egg |
| 165 | * problem hw_breakpoint has with context |
| 166 | * creation and event initalization. |
| 167 | */ |
| 168 | struct arch_hw_breakpoint info; |
| 169 | struct list_head bp_list; |
| 170 | }; |
| 171 | #endif |
| 172 | struct { /* amd_iommu */ |
| 173 | u8 iommu_bank; |
| 174 | u8 iommu_cntr; |
| 175 | u16 padding; |
| 176 | u64 conf; |
| 177 | u64 conf1; |
| 178 | }; |
| 179 | }; |
| 180 | /* |
| 181 | * If the event is a per task event, this will point to the task in |
| 182 | * question. See the comment in perf_event_alloc(). |
| 183 | */ |
| 184 | struct task_struct *target; |
| 185 | |
| 186 | /* |
| 187 | * PMU would store hardware filter configuration |
| 188 | * here. |
| 189 | */ |
| 190 | void *addr_filters; |
| 191 | |
| 192 | /* Last sync'ed generation of filters */ |
| 193 | unsigned long addr_filters_gen; |
| 194 | |
| 195 | /* |
| 196 | * hw_perf_event::state flags; used to track the PERF_EF_* state. |
| 197 | */ |
| 198 | #define PERF_HES_STOPPED 0x01 /* the counter is stopped */ |
| 199 | #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */ |
| 200 | #define PERF_HES_ARCH 0x04 |
| 201 | |
| 202 | int state; |
| 203 | |
| 204 | /* |
| 205 | * The last observed hardware counter value, updated with a |
| 206 | * local64_cmpxchg() such that pmu::read() can be called nested. |
| 207 | */ |
| 208 | local64_t prev_count; |
| 209 | |
| 210 | /* |
| 211 | * The period to start the next sample with. |
| 212 | */ |
| 213 | u64 sample_period; |
| 214 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 215 | union { |
| 216 | struct { /* Sampling */ |
| 217 | /* |
| 218 | * The period we started this sample with. |
| 219 | */ |
| 220 | u64 last_period; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 221 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 222 | /* |
| 223 | * However much is left of the current period; |
| 224 | * note that this is a full 64bit value and |
| 225 | * allows for generation of periods longer |
| 226 | * than hardware might allow. |
| 227 | */ |
| 228 | local64_t period_left; |
| 229 | }; |
| 230 | struct { /* Topdown events counting for context switch */ |
| 231 | u64 saved_metric; |
| 232 | u64 saved_slots; |
| 233 | }; |
| 234 | }; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 235 | |
| 236 | /* |
| 237 | * State for throttling the event, see __perf_event_overflow() and |
| 238 | * perf_adjust_freq_unthr_context(). |
| 239 | */ |
| 240 | u64 interrupts_seq; |
| 241 | u64 interrupts; |
| 242 | |
| 243 | /* |
| 244 | * State for freq target events, see __perf_event_overflow() and |
| 245 | * perf_adjust_freq_unthr_context(). |
| 246 | */ |
| 247 | u64 freq_time_stamp; |
| 248 | u64 freq_count_stamp; |
| 249 | #endif |
| 250 | }; |
| 251 | |
| 252 | struct perf_event; |
| 253 | |
| 254 | /* |
| 255 | * Common implementation detail of pmu::{start,commit,cancel}_txn |
| 256 | */ |
| 257 | #define PERF_PMU_TXN_ADD 0x1 /* txn to add/schedule event on PMU */ |
| 258 | #define PERF_PMU_TXN_READ 0x2 /* txn to read event group from PMU */ |
| 259 | |
| 260 | /** |
| 261 | * pmu::capabilities flags |
| 262 | */ |
| 263 | #define PERF_PMU_CAP_NO_INTERRUPT 0x01 |
| 264 | #define PERF_PMU_CAP_NO_NMI 0x02 |
| 265 | #define PERF_PMU_CAP_AUX_NO_SG 0x04 |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 266 | #define PERF_PMU_CAP_EXTENDED_REGS 0x08 |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 267 | #define PERF_PMU_CAP_EXCLUSIVE 0x10 |
| 268 | #define PERF_PMU_CAP_ITRACE 0x20 |
| 269 | #define PERF_PMU_CAP_HETEROGENEOUS_CPUS 0x40 |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 270 | #define PERF_PMU_CAP_NO_EXCLUDE 0x80 |
| 271 | #define PERF_PMU_CAP_AUX_OUTPUT 0x100 |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 272 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 273 | struct perf_output_handle; |
| 274 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 275 | /** |
| 276 | * struct pmu - generic performance monitoring unit |
| 277 | */ |
| 278 | struct pmu { |
| 279 | struct list_head entry; |
| 280 | |
| 281 | struct module *module; |
| 282 | struct device *dev; |
| 283 | const struct attribute_group **attr_groups; |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 284 | const struct attribute_group **attr_update; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 285 | const char *name; |
| 286 | int type; |
| 287 | |
| 288 | /* |
| 289 | * various common per-pmu feature flags |
| 290 | */ |
| 291 | int capabilities; |
| 292 | |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 293 | int __percpu *pmu_disable_count; |
| 294 | struct perf_cpu_context __percpu *pmu_cpu_context; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 295 | atomic_t exclusive_cnt; /* < 0: cpu; > 0: tsk */ |
| 296 | int task_ctx_nr; |
| 297 | int hrtimer_interval_ms; |
| 298 | |
| 299 | /* number of address filters this PMU can do */ |
| 300 | unsigned int nr_addr_filters; |
| 301 | |
| 302 | /* |
| 303 | * Fully disable/enable this PMU, can be used to protect from the PMI |
| 304 | * as well as for lazy/batch writing of the MSRs. |
| 305 | */ |
| 306 | void (*pmu_enable) (struct pmu *pmu); /* optional */ |
| 307 | void (*pmu_disable) (struct pmu *pmu); /* optional */ |
| 308 | |
| 309 | /* |
| 310 | * Try and initialize the event for this PMU. |
| 311 | * |
| 312 | * Returns: |
| 313 | * -ENOENT -- @event is not for this PMU |
| 314 | * |
| 315 | * -ENODEV -- @event is for this PMU but PMU not present |
| 316 | * -EBUSY -- @event is for this PMU but PMU temporarily unavailable |
| 317 | * -EINVAL -- @event is for this PMU but @event is not valid |
| 318 | * -EOPNOTSUPP -- @event is for this PMU, @event is valid, but not supported |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 319 | * -EACCES -- @event is for this PMU, @event is valid, but no privileges |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 320 | * |
| 321 | * 0 -- @event is for this PMU and valid |
| 322 | * |
| 323 | * Other error return values are allowed. |
| 324 | */ |
| 325 | int (*event_init) (struct perf_event *event); |
| 326 | |
| 327 | /* |
| 328 | * Notification that the event was mapped or unmapped. Called |
| 329 | * in the context of the mapping task. |
| 330 | */ |
| 331 | void (*event_mapped) (struct perf_event *event, struct mm_struct *mm); /* optional */ |
| 332 | void (*event_unmapped) (struct perf_event *event, struct mm_struct *mm); /* optional */ |
| 333 | |
| 334 | /* |
| 335 | * Flags for ->add()/->del()/ ->start()/->stop(). There are |
| 336 | * matching hw_perf_event::state flags. |
| 337 | */ |
| 338 | #define PERF_EF_START 0x01 /* start the counter when adding */ |
| 339 | #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */ |
| 340 | #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */ |
| 341 | |
| 342 | /* |
| 343 | * Adds/Removes a counter to/from the PMU, can be done inside a |
| 344 | * transaction, see the ->*_txn() methods. |
| 345 | * |
| 346 | * The add/del callbacks will reserve all hardware resources required |
| 347 | * to service the event, this includes any counter constraint |
| 348 | * scheduling etc. |
| 349 | * |
| 350 | * Called with IRQs disabled and the PMU disabled on the CPU the event |
| 351 | * is on. |
| 352 | * |
| 353 | * ->add() called without PERF_EF_START should result in the same state |
| 354 | * as ->add() followed by ->stop(). |
| 355 | * |
| 356 | * ->del() must always PERF_EF_UPDATE stop an event. If it calls |
| 357 | * ->stop() that must deal with already being stopped without |
| 358 | * PERF_EF_UPDATE. |
| 359 | */ |
| 360 | int (*add) (struct perf_event *event, int flags); |
| 361 | void (*del) (struct perf_event *event, int flags); |
| 362 | |
| 363 | /* |
| 364 | * Starts/Stops a counter present on the PMU. |
| 365 | * |
| 366 | * The PMI handler should stop the counter when perf_event_overflow() |
| 367 | * returns !0. ->start() will be used to continue. |
| 368 | * |
| 369 | * Also used to change the sample period. |
| 370 | * |
| 371 | * Called with IRQs disabled and the PMU disabled on the CPU the event |
| 372 | * is on -- will be called from NMI context with the PMU generates |
| 373 | * NMIs. |
| 374 | * |
| 375 | * ->stop() with PERF_EF_UPDATE will read the counter and update |
| 376 | * period/count values like ->read() would. |
| 377 | * |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 378 | * ->start() with PERF_EF_RELOAD will reprogram the counter |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 379 | * value, must be preceded by a ->stop() with PERF_EF_UPDATE. |
| 380 | */ |
| 381 | void (*start) (struct perf_event *event, int flags); |
| 382 | void (*stop) (struct perf_event *event, int flags); |
| 383 | |
| 384 | /* |
| 385 | * Updates the counter value of the event. |
| 386 | * |
| 387 | * For sampling capable PMUs this will also update the software period |
| 388 | * hw_perf_event::period_left field. |
| 389 | */ |
| 390 | void (*read) (struct perf_event *event); |
| 391 | |
| 392 | /* |
| 393 | * Group events scheduling is treated as a transaction, add |
| 394 | * group events as a whole and perform one schedulability test. |
| 395 | * If the test fails, roll back the whole group |
| 396 | * |
| 397 | * Start the transaction, after this ->add() doesn't need to |
| 398 | * do schedulability tests. |
| 399 | * |
| 400 | * Optional. |
| 401 | */ |
| 402 | void (*start_txn) (struct pmu *pmu, unsigned int txn_flags); |
| 403 | /* |
| 404 | * If ->start_txn() disabled the ->add() schedulability test |
| 405 | * then ->commit_txn() is required to perform one. On success |
| 406 | * the transaction is closed. On error the transaction is kept |
| 407 | * open until ->cancel_txn() is called. |
| 408 | * |
| 409 | * Optional. |
| 410 | */ |
| 411 | int (*commit_txn) (struct pmu *pmu); |
| 412 | /* |
| 413 | * Will cancel the transaction, assumes ->del() is called |
| 414 | * for each successful ->add() during the transaction. |
| 415 | * |
| 416 | * Optional. |
| 417 | */ |
| 418 | void (*cancel_txn) (struct pmu *pmu); |
| 419 | |
| 420 | /* |
| 421 | * Will return the value for perf_event_mmap_page::index for this event, |
| 422 | * if no implementation is provided it will default to: event->hw.idx + 1. |
| 423 | */ |
| 424 | int (*event_idx) (struct perf_event *event); /*optional */ |
| 425 | |
| 426 | /* |
| 427 | * context-switches callback |
| 428 | */ |
| 429 | void (*sched_task) (struct perf_event_context *ctx, |
| 430 | bool sched_in); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 431 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 432 | /* |
| 433 | * Kmem cache of PMU specific data |
| 434 | */ |
| 435 | struct kmem_cache *task_ctx_cache; |
| 436 | |
| 437 | /* |
| 438 | * PMU specific parts of task perf event context (i.e. ctx->task_ctx_data) |
| 439 | * can be synchronized using this function. See Intel LBR callstack support |
| 440 | * implementation and Perf core context switch handling callbacks for usage |
| 441 | * examples. |
| 442 | */ |
| 443 | void (*swap_task_ctx) (struct perf_event_context *prev, |
| 444 | struct perf_event_context *next); |
| 445 | /* optional */ |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 446 | |
| 447 | /* |
| 448 | * Set up pmu-private data structures for an AUX area |
| 449 | */ |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 450 | void *(*setup_aux) (struct perf_event *event, void **pages, |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 451 | int nr_pages, bool overwrite); |
| 452 | /* optional */ |
| 453 | |
| 454 | /* |
| 455 | * Free pmu-private AUX data structures |
| 456 | */ |
| 457 | void (*free_aux) (void *aux); /* optional */ |
| 458 | |
| 459 | /* |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 460 | * Take a snapshot of the AUX buffer without touching the event |
| 461 | * state, so that preempting ->start()/->stop() callbacks does |
| 462 | * not interfere with their logic. Called in PMI context. |
| 463 | * |
| 464 | * Returns the size of AUX data copied to the output handle. |
| 465 | * |
| 466 | * Optional. |
| 467 | */ |
| 468 | long (*snapshot_aux) (struct perf_event *event, |
| 469 | struct perf_output_handle *handle, |
| 470 | unsigned long size); |
| 471 | |
| 472 | /* |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 473 | * Validate address range filters: make sure the HW supports the |
| 474 | * requested configuration and number of filters; return 0 if the |
| 475 | * supplied filters are valid, -errno otherwise. |
| 476 | * |
| 477 | * Runs in the context of the ioctl()ing process and is not serialized |
| 478 | * with the rest of the PMU callbacks. |
| 479 | */ |
| 480 | int (*addr_filters_validate) (struct list_head *filters); |
| 481 | /* optional */ |
| 482 | |
| 483 | /* |
| 484 | * Synchronize address range filter configuration: |
| 485 | * translate hw-agnostic filters into hardware configuration in |
| 486 | * event::hw::addr_filters. |
| 487 | * |
| 488 | * Runs as a part of filter sync sequence that is done in ->start() |
| 489 | * callback by calling perf_event_addr_filters_sync(). |
| 490 | * |
| 491 | * May (and should) traverse event::addr_filters::list, for which its |
| 492 | * caller provides necessary serialization. |
| 493 | */ |
| 494 | void (*addr_filters_sync) (struct perf_event *event); |
| 495 | /* optional */ |
| 496 | |
| 497 | /* |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 498 | * Check if event can be used for aux_output purposes for |
| 499 | * events of this PMU. |
| 500 | * |
| 501 | * Runs from perf_event_open(). Should return 0 for "no match" |
| 502 | * or non-zero for "match". |
| 503 | */ |
| 504 | int (*aux_output_match) (struct perf_event *event); |
| 505 | /* optional */ |
| 506 | |
| 507 | /* |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 508 | * Filter events for PMU-specific reasons. |
| 509 | */ |
| 510 | int (*filter_match) (struct perf_event *event); /* optional */ |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 511 | |
| 512 | /* |
| 513 | * Check period value for PERF_EVENT_IOC_PERIOD ioctl. |
| 514 | */ |
| 515 | int (*check_period) (struct perf_event *event, u64 value); /* optional */ |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 516 | }; |
| 517 | |
| 518 | enum perf_addr_filter_action_t { |
| 519 | PERF_ADDR_FILTER_ACTION_STOP = 0, |
| 520 | PERF_ADDR_FILTER_ACTION_START, |
| 521 | PERF_ADDR_FILTER_ACTION_FILTER, |
| 522 | }; |
| 523 | |
| 524 | /** |
| 525 | * struct perf_addr_filter - address range filter definition |
| 526 | * @entry: event's filter list linkage |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 527 | * @path: object file's path for file-based filters |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 528 | * @offset: filter range offset |
| 529 | * @size: filter range size (size==0 means single address trigger) |
| 530 | * @action: filter/start/stop |
| 531 | * |
| 532 | * This is a hardware-agnostic filter configuration as specified by the user. |
| 533 | */ |
| 534 | struct perf_addr_filter { |
| 535 | struct list_head entry; |
| 536 | struct path path; |
| 537 | unsigned long offset; |
| 538 | unsigned long size; |
| 539 | enum perf_addr_filter_action_t action; |
| 540 | }; |
| 541 | |
| 542 | /** |
| 543 | * struct perf_addr_filters_head - container for address range filters |
| 544 | * @list: list of filters for this event |
| 545 | * @lock: spinlock that serializes accesses to the @list and event's |
| 546 | * (and its children's) filter generations. |
| 547 | * @nr_file_filters: number of file-based filters |
| 548 | * |
| 549 | * A child event will use parent's @list (and therefore @lock), so they are |
| 550 | * bundled together; see perf_event_addr_filters(). |
| 551 | */ |
| 552 | struct perf_addr_filters_head { |
| 553 | struct list_head list; |
| 554 | raw_spinlock_t lock; |
| 555 | unsigned int nr_file_filters; |
| 556 | }; |
| 557 | |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 558 | struct perf_addr_filter_range { |
| 559 | unsigned long start; |
| 560 | unsigned long size; |
| 561 | }; |
| 562 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 563 | /** |
| 564 | * enum perf_event_state - the states of an event: |
| 565 | */ |
| 566 | enum perf_event_state { |
| 567 | PERF_EVENT_STATE_DEAD = -4, |
| 568 | PERF_EVENT_STATE_EXIT = -3, |
| 569 | PERF_EVENT_STATE_ERROR = -2, |
| 570 | PERF_EVENT_STATE_OFF = -1, |
| 571 | PERF_EVENT_STATE_INACTIVE = 0, |
| 572 | PERF_EVENT_STATE_ACTIVE = 1, |
| 573 | }; |
| 574 | |
| 575 | struct file; |
| 576 | struct perf_sample_data; |
| 577 | |
| 578 | typedef void (*perf_overflow_handler_t)(struct perf_event *, |
| 579 | struct perf_sample_data *, |
| 580 | struct pt_regs *regs); |
| 581 | |
| 582 | /* |
| 583 | * Event capabilities. For event_caps and groups caps. |
| 584 | * |
| 585 | * PERF_EV_CAP_SOFTWARE: Is a software event. |
| 586 | * PERF_EV_CAP_READ_ACTIVE_PKG: A CPU event (or cgroup event) that can be read |
| 587 | * from any CPU in the package where it is active. |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 588 | * PERF_EV_CAP_SIBLING: An event with this flag must be a group sibling and |
| 589 | * cannot be a group leader. If an event with this flag is detached from the |
| 590 | * group it is scheduled out and moved into an unrecoverable ERROR state. |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 591 | */ |
| 592 | #define PERF_EV_CAP_SOFTWARE BIT(0) |
| 593 | #define PERF_EV_CAP_READ_ACTIVE_PKG BIT(1) |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 594 | #define PERF_EV_CAP_SIBLING BIT(2) |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 595 | |
| 596 | #define SWEVENT_HLIST_BITS 8 |
| 597 | #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS) |
| 598 | |
| 599 | struct swevent_hlist { |
| 600 | struct hlist_head heads[SWEVENT_HLIST_SIZE]; |
| 601 | struct rcu_head rcu_head; |
| 602 | }; |
| 603 | |
| 604 | #define PERF_ATTACH_CONTEXT 0x01 |
| 605 | #define PERF_ATTACH_GROUP 0x02 |
| 606 | #define PERF_ATTACH_TASK 0x04 |
| 607 | #define PERF_ATTACH_TASK_DATA 0x08 |
| 608 | #define PERF_ATTACH_ITRACE 0x10 |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 609 | #define PERF_ATTACH_SCHED_CB 0x20 |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 610 | |
| 611 | struct perf_cgroup; |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 612 | struct perf_buffer; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 613 | |
| 614 | struct pmu_event_list { |
| 615 | raw_spinlock_t lock; |
| 616 | struct list_head list; |
| 617 | }; |
| 618 | |
| 619 | #define for_each_sibling_event(sibling, event) \ |
| 620 | if ((event)->group_leader == (event)) \ |
| 621 | list_for_each_entry((sibling), &(event)->sibling_list, sibling_list) |
| 622 | |
| 623 | /** |
| 624 | * struct perf_event - performance event kernel representation: |
| 625 | */ |
| 626 | struct perf_event { |
| 627 | #ifdef CONFIG_PERF_EVENTS |
| 628 | /* |
| 629 | * entry onto perf_event_context::event_list; |
| 630 | * modifications require ctx->lock |
| 631 | * RCU safe iterations. |
| 632 | */ |
| 633 | struct list_head event_entry; |
| 634 | |
| 635 | /* |
| 636 | * Locked for modification by both ctx->mutex and ctx->lock; holding |
| 637 | * either sufficies for read. |
| 638 | */ |
| 639 | struct list_head sibling_list; |
| 640 | struct list_head active_list; |
| 641 | /* |
| 642 | * Node on the pinned or flexible tree located at the event context; |
| 643 | */ |
| 644 | struct rb_node group_node; |
| 645 | u64 group_index; |
| 646 | /* |
| 647 | * We need storage to track the entries in perf_pmu_migrate_context; we |
| 648 | * cannot use the event_entry because of RCU and we want to keep the |
| 649 | * group in tact which avoids us using the other two entries. |
| 650 | */ |
| 651 | struct list_head migrate_entry; |
| 652 | |
| 653 | struct hlist_node hlist_entry; |
| 654 | struct list_head active_entry; |
| 655 | int nr_siblings; |
| 656 | |
| 657 | /* Not serialized. Only written during event initialization. */ |
| 658 | int event_caps; |
| 659 | /* The cumulative AND of all event_caps for events in this group. */ |
| 660 | int group_caps; |
| 661 | |
| 662 | struct perf_event *group_leader; |
| 663 | struct pmu *pmu; |
| 664 | void *pmu_private; |
| 665 | |
| 666 | enum perf_event_state state; |
| 667 | unsigned int attach_state; |
| 668 | local64_t count; |
| 669 | atomic64_t child_count; |
| 670 | |
| 671 | /* |
| 672 | * These are the total time in nanoseconds that the event |
| 673 | * has been enabled (i.e. eligible to run, and the task has |
| 674 | * been scheduled in, if this is a per-task event) |
| 675 | * and running (scheduled onto the CPU), respectively. |
| 676 | */ |
| 677 | u64 total_time_enabled; |
| 678 | u64 total_time_running; |
| 679 | u64 tstamp; |
| 680 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 681 | struct perf_event_attr attr; |
| 682 | u16 header_size; |
| 683 | u16 id_header_size; |
| 684 | u16 read_size; |
| 685 | struct hw_perf_event hw; |
| 686 | |
| 687 | struct perf_event_context *ctx; |
| 688 | atomic_long_t refcount; |
| 689 | |
| 690 | /* |
| 691 | * These accumulate total time (in nanoseconds) that children |
| 692 | * events have been enabled and running, respectively. |
| 693 | */ |
| 694 | atomic64_t child_total_time_enabled; |
| 695 | atomic64_t child_total_time_running; |
| 696 | |
| 697 | /* |
| 698 | * Protect attach/detach and child_list: |
| 699 | */ |
| 700 | struct mutex child_mutex; |
| 701 | struct list_head child_list; |
| 702 | struct perf_event *parent; |
| 703 | |
| 704 | int oncpu; |
| 705 | int cpu; |
| 706 | |
| 707 | struct list_head owner_entry; |
| 708 | struct task_struct *owner; |
| 709 | |
| 710 | /* mmap bits */ |
| 711 | struct mutex mmap_mutex; |
| 712 | atomic_t mmap_count; |
| 713 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 714 | struct perf_buffer *rb; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 715 | struct list_head rb_entry; |
| 716 | unsigned long rcu_batches; |
| 717 | int rcu_pending; |
| 718 | |
| 719 | /* poll related */ |
| 720 | wait_queue_head_t waitq; |
| 721 | struct fasync_struct *fasync; |
| 722 | |
| 723 | /* delayed work for NMIs and such */ |
| 724 | int pending_wakeup; |
| 725 | int pending_kill; |
| 726 | int pending_disable; |
| 727 | struct irq_work pending; |
| 728 | |
| 729 | atomic_t event_limit; |
| 730 | |
| 731 | /* address range filters */ |
| 732 | struct perf_addr_filters_head addr_filters; |
| 733 | /* vma address array for file-based filders */ |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 734 | struct perf_addr_filter_range *addr_filter_ranges; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 735 | unsigned long addr_filters_gen; |
| 736 | |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 737 | /* for aux_output events */ |
| 738 | struct perf_event *aux_event; |
| 739 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 740 | void (*destroy)(struct perf_event *); |
| 741 | struct rcu_head rcu_head; |
| 742 | |
| 743 | struct pid_namespace *ns; |
| 744 | u64 id; |
| 745 | |
| 746 | u64 (*clock)(void); |
| 747 | perf_overflow_handler_t overflow_handler; |
| 748 | void *overflow_handler_context; |
| 749 | #ifdef CONFIG_BPF_SYSCALL |
| 750 | perf_overflow_handler_t orig_overflow_handler; |
| 751 | struct bpf_prog *prog; |
| 752 | #endif |
| 753 | |
| 754 | #ifdef CONFIG_EVENT_TRACING |
| 755 | struct trace_event_call *tp_event; |
| 756 | struct event_filter *filter; |
| 757 | #ifdef CONFIG_FUNCTION_TRACER |
| 758 | struct ftrace_ops ftrace_ops; |
| 759 | #endif |
| 760 | #endif |
| 761 | |
| 762 | #ifdef CONFIG_CGROUP_PERF |
| 763 | struct perf_cgroup *cgrp; /* cgroup event is attach to */ |
| 764 | #endif |
| 765 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 766 | #ifdef CONFIG_SECURITY |
| 767 | void *security; |
| 768 | #endif |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 769 | struct list_head sb_list; |
| 770 | #endif /* CONFIG_PERF_EVENTS */ |
| 771 | }; |
| 772 | |
| 773 | |
| 774 | struct perf_event_groups { |
| 775 | struct rb_root tree; |
| 776 | u64 index; |
| 777 | }; |
| 778 | |
| 779 | /** |
| 780 | * struct perf_event_context - event context structure |
| 781 | * |
| 782 | * Used as a container for task events and CPU events as well: |
| 783 | */ |
| 784 | struct perf_event_context { |
| 785 | struct pmu *pmu; |
| 786 | /* |
| 787 | * Protect the states of the events in the list, |
| 788 | * nr_active, and the list: |
| 789 | */ |
| 790 | raw_spinlock_t lock; |
| 791 | /* |
| 792 | * Protect the list of events. Locking either mutex or lock |
| 793 | * is sufficient to ensure the list doesn't change; to change |
| 794 | * the list you need to lock both the mutex and the spinlock. |
| 795 | */ |
| 796 | struct mutex mutex; |
| 797 | |
| 798 | struct list_head active_ctx_list; |
| 799 | struct perf_event_groups pinned_groups; |
| 800 | struct perf_event_groups flexible_groups; |
| 801 | struct list_head event_list; |
| 802 | |
| 803 | struct list_head pinned_active; |
| 804 | struct list_head flexible_active; |
| 805 | |
| 806 | int nr_events; |
| 807 | int nr_active; |
| 808 | int is_active; |
| 809 | int nr_stat; |
| 810 | int nr_freq; |
| 811 | int rotate_disable; |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 812 | /* |
| 813 | * Set when nr_events != nr_active, except tolerant to events not |
| 814 | * necessary to be active due to scheduling constraints, such as cgroups. |
| 815 | */ |
| 816 | int rotate_necessary; |
| 817 | refcount_t refcount; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 818 | struct task_struct *task; |
| 819 | |
| 820 | /* |
| 821 | * Context clock, runs when context enabled. |
| 822 | */ |
| 823 | u64 time; |
| 824 | u64 timestamp; |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 825 | u64 timeoffset; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 826 | |
| 827 | /* |
| 828 | * These fields let us detect when two contexts have both |
| 829 | * been cloned (inherited) from a common ancestor. |
| 830 | */ |
| 831 | struct perf_event_context *parent_ctx; |
| 832 | u64 parent_gen; |
| 833 | u64 generation; |
| 834 | int pin_count; |
| 835 | #ifdef CONFIG_CGROUP_PERF |
| 836 | int nr_cgroups; /* cgroup evts */ |
| 837 | #endif |
| 838 | void *task_ctx_data; /* pmu specific data */ |
| 839 | struct rcu_head rcu_head; |
| 840 | }; |
| 841 | |
| 842 | /* |
| 843 | * Number of contexts where an event can trigger: |
| 844 | * task, softirq, hardirq, nmi. |
| 845 | */ |
| 846 | #define PERF_NR_CONTEXTS 4 |
| 847 | |
| 848 | /** |
| 849 | * struct perf_event_cpu_context - per cpu event context structure |
| 850 | */ |
| 851 | struct perf_cpu_context { |
| 852 | struct perf_event_context ctx; |
| 853 | struct perf_event_context *task_ctx; |
| 854 | int active_oncpu; |
| 855 | int exclusive; |
| 856 | |
| 857 | raw_spinlock_t hrtimer_lock; |
| 858 | struct hrtimer hrtimer; |
| 859 | ktime_t hrtimer_interval; |
| 860 | unsigned int hrtimer_active; |
| 861 | |
| 862 | #ifdef CONFIG_CGROUP_PERF |
| 863 | struct perf_cgroup *cgrp; |
| 864 | struct list_head cgrp_cpuctx_entry; |
| 865 | #endif |
| 866 | |
| 867 | struct list_head sched_cb_entry; |
| 868 | int sched_cb_usage; |
| 869 | |
| 870 | int online; |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 871 | /* |
| 872 | * Per-CPU storage for iterators used in visit_groups_merge. The default |
| 873 | * storage is of size 2 to hold the CPU and any CPU event iterators. |
| 874 | */ |
| 875 | int heap_size; |
| 876 | struct perf_event **heap; |
| 877 | struct perf_event *heap_default[2]; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 878 | }; |
| 879 | |
| 880 | struct perf_output_handle { |
| 881 | struct perf_event *event; |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 882 | struct perf_buffer *rb; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 883 | unsigned long wakeup; |
| 884 | unsigned long size; |
| 885 | u64 aux_flags; |
| 886 | union { |
| 887 | void *addr; |
| 888 | unsigned long head; |
| 889 | }; |
| 890 | int page; |
| 891 | }; |
| 892 | |
| 893 | struct bpf_perf_event_data_kern { |
| 894 | bpf_user_pt_regs_t *regs; |
| 895 | struct perf_sample_data *data; |
| 896 | struct perf_event *event; |
| 897 | }; |
| 898 | |
| 899 | #ifdef CONFIG_CGROUP_PERF |
| 900 | |
| 901 | /* |
| 902 | * perf_cgroup_info keeps track of time_enabled for a cgroup. |
| 903 | * This is a per-cpu dynamically allocated data structure. |
| 904 | */ |
| 905 | struct perf_cgroup_info { |
| 906 | u64 time; |
| 907 | u64 timestamp; |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 908 | u64 timeoffset; |
| 909 | int active; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 910 | }; |
| 911 | |
| 912 | struct perf_cgroup { |
| 913 | struct cgroup_subsys_state css; |
| 914 | struct perf_cgroup_info __percpu *info; |
| 915 | }; |
| 916 | |
| 917 | /* |
| 918 | * Must ensure cgroup is pinned (css_get) before calling |
| 919 | * this function. In other words, we cannot call this function |
| 920 | * if there is no cgroup event for the current CPU context. |
| 921 | */ |
| 922 | static inline struct perf_cgroup * |
| 923 | perf_cgroup_from_task(struct task_struct *task, struct perf_event_context *ctx) |
| 924 | { |
| 925 | return container_of(task_css_check(task, perf_event_cgrp_id, |
| 926 | ctx ? lockdep_is_held(&ctx->lock) |
| 927 | : true), |
| 928 | struct perf_cgroup, css); |
| 929 | } |
| 930 | #endif /* CONFIG_CGROUP_PERF */ |
| 931 | |
| 932 | #ifdef CONFIG_PERF_EVENTS |
| 933 | |
| 934 | extern void *perf_aux_output_begin(struct perf_output_handle *handle, |
| 935 | struct perf_event *event); |
| 936 | extern void perf_aux_output_end(struct perf_output_handle *handle, |
| 937 | unsigned long size); |
| 938 | extern int perf_aux_output_skip(struct perf_output_handle *handle, |
| 939 | unsigned long size); |
| 940 | extern void *perf_get_aux(struct perf_output_handle *handle); |
| 941 | extern void perf_aux_output_flag(struct perf_output_handle *handle, u64 flags); |
| 942 | extern void perf_event_itrace_started(struct perf_event *event); |
| 943 | |
| 944 | extern int perf_pmu_register(struct pmu *pmu, const char *name, int type); |
| 945 | extern void perf_pmu_unregister(struct pmu *pmu); |
| 946 | |
| 947 | extern int perf_num_counters(void); |
| 948 | extern const char *perf_pmu_name(void); |
| 949 | extern void __perf_event_task_sched_in(struct task_struct *prev, |
| 950 | struct task_struct *task); |
| 951 | extern void __perf_event_task_sched_out(struct task_struct *prev, |
| 952 | struct task_struct *next); |
| 953 | extern int perf_event_init_task(struct task_struct *child); |
| 954 | extern void perf_event_exit_task(struct task_struct *child); |
| 955 | extern void perf_event_free_task(struct task_struct *task); |
| 956 | extern void perf_event_delayed_put(struct task_struct *task); |
| 957 | extern struct file *perf_event_get(unsigned int fd); |
| 958 | extern const struct perf_event *perf_get_event(struct file *file); |
| 959 | extern const struct perf_event_attr *perf_event_attrs(struct perf_event *event); |
| 960 | extern void perf_event_print_debug(void); |
| 961 | extern void perf_pmu_disable(struct pmu *pmu); |
| 962 | extern void perf_pmu_enable(struct pmu *pmu); |
| 963 | extern void perf_sched_cb_dec(struct pmu *pmu); |
| 964 | extern void perf_sched_cb_inc(struct pmu *pmu); |
| 965 | extern int perf_event_task_disable(void); |
| 966 | extern int perf_event_task_enable(void); |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 967 | |
| 968 | extern void perf_pmu_resched(struct pmu *pmu); |
| 969 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 970 | extern int perf_event_refresh(struct perf_event *event, int refresh); |
| 971 | extern void perf_event_update_userpage(struct perf_event *event); |
| 972 | extern int perf_event_release_kernel(struct perf_event *event); |
| 973 | extern struct perf_event * |
| 974 | perf_event_create_kernel_counter(struct perf_event_attr *attr, |
| 975 | int cpu, |
| 976 | struct task_struct *task, |
| 977 | perf_overflow_handler_t callback, |
| 978 | void *context); |
| 979 | extern void perf_pmu_migrate_context(struct pmu *pmu, |
| 980 | int src_cpu, int dst_cpu); |
| 981 | int perf_event_read_local(struct perf_event *event, u64 *value, |
| 982 | u64 *enabled, u64 *running); |
| 983 | extern u64 perf_event_read_value(struct perf_event *event, |
| 984 | u64 *enabled, u64 *running); |
| 985 | |
| 986 | |
| 987 | struct perf_sample_data { |
| 988 | /* |
| 989 | * Fields set by perf_sample_data_init(), group so as to |
| 990 | * minimize the cachelines touched. |
| 991 | */ |
| 992 | u64 addr; |
| 993 | struct perf_raw_record *raw; |
| 994 | struct perf_branch_stack *br_stack; |
| 995 | u64 period; |
| 996 | u64 weight; |
| 997 | u64 txn; |
| 998 | union perf_mem_data_src data_src; |
| 999 | |
| 1000 | /* |
| 1001 | * The other fields, optionally {set,used} by |
| 1002 | * perf_{prepare,output}_sample(). |
| 1003 | */ |
| 1004 | u64 type; |
| 1005 | u64 ip; |
| 1006 | struct { |
| 1007 | u32 pid; |
| 1008 | u32 tid; |
| 1009 | } tid_entry; |
| 1010 | u64 time; |
| 1011 | u64 id; |
| 1012 | u64 stream_id; |
| 1013 | struct { |
| 1014 | u32 cpu; |
| 1015 | u32 reserved; |
| 1016 | } cpu_entry; |
| 1017 | struct perf_callchain_entry *callchain; |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1018 | u64 aux_size; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1019 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1020 | struct perf_regs regs_user; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1021 | struct perf_regs regs_intr; |
| 1022 | u64 stack_user_size; |
| 1023 | |
| 1024 | u64 phys_addr; |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1025 | u64 cgroup; |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1026 | } ____cacheline_aligned; |
| 1027 | |
| 1028 | /* default value for data source */ |
| 1029 | #define PERF_MEM_NA (PERF_MEM_S(OP, NA) |\ |
| 1030 | PERF_MEM_S(LVL, NA) |\ |
| 1031 | PERF_MEM_S(SNOOP, NA) |\ |
| 1032 | PERF_MEM_S(LOCK, NA) |\ |
| 1033 | PERF_MEM_S(TLB, NA)) |
| 1034 | |
| 1035 | static inline void perf_sample_data_init(struct perf_sample_data *data, |
| 1036 | u64 addr, u64 period) |
| 1037 | { |
| 1038 | /* remaining struct members initialized in perf_prepare_sample() */ |
| 1039 | data->addr = addr; |
| 1040 | data->raw = NULL; |
| 1041 | data->br_stack = NULL; |
| 1042 | data->period = period; |
| 1043 | data->weight = 0; |
| 1044 | data->data_src.val = PERF_MEM_NA; |
| 1045 | data->txn = 0; |
| 1046 | } |
| 1047 | |
| 1048 | extern void perf_output_sample(struct perf_output_handle *handle, |
| 1049 | struct perf_event_header *header, |
| 1050 | struct perf_sample_data *data, |
| 1051 | struct perf_event *event); |
| 1052 | extern void perf_prepare_sample(struct perf_event_header *header, |
| 1053 | struct perf_sample_data *data, |
| 1054 | struct perf_event *event, |
| 1055 | struct pt_regs *regs); |
| 1056 | |
| 1057 | extern int perf_event_overflow(struct perf_event *event, |
| 1058 | struct perf_sample_data *data, |
| 1059 | struct pt_regs *regs); |
| 1060 | |
| 1061 | extern void perf_event_output_forward(struct perf_event *event, |
| 1062 | struct perf_sample_data *data, |
| 1063 | struct pt_regs *regs); |
| 1064 | extern void perf_event_output_backward(struct perf_event *event, |
| 1065 | struct perf_sample_data *data, |
| 1066 | struct pt_regs *regs); |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 1067 | extern int perf_event_output(struct perf_event *event, |
| 1068 | struct perf_sample_data *data, |
| 1069 | struct pt_regs *regs); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1070 | |
| 1071 | static inline bool |
| 1072 | is_default_overflow_handler(struct perf_event *event) |
| 1073 | { |
| 1074 | if (likely(event->overflow_handler == perf_event_output_forward)) |
| 1075 | return true; |
| 1076 | if (unlikely(event->overflow_handler == perf_event_output_backward)) |
| 1077 | return true; |
| 1078 | return false; |
| 1079 | } |
| 1080 | |
| 1081 | extern void |
| 1082 | perf_event_header__init_id(struct perf_event_header *header, |
| 1083 | struct perf_sample_data *data, |
| 1084 | struct perf_event *event); |
| 1085 | extern void |
| 1086 | perf_event__output_id_sample(struct perf_event *event, |
| 1087 | struct perf_output_handle *handle, |
| 1088 | struct perf_sample_data *sample); |
| 1089 | |
| 1090 | extern void |
| 1091 | perf_log_lost_samples(struct perf_event *event, u64 lost); |
| 1092 | |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 1093 | static inline bool event_has_any_exclude_flag(struct perf_event *event) |
| 1094 | { |
| 1095 | struct perf_event_attr *attr = &event->attr; |
| 1096 | |
| 1097 | return attr->exclude_idle || attr->exclude_user || |
| 1098 | attr->exclude_kernel || attr->exclude_hv || |
| 1099 | attr->exclude_guest || attr->exclude_host; |
| 1100 | } |
| 1101 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1102 | static inline bool is_sampling_event(struct perf_event *event) |
| 1103 | { |
| 1104 | return event->attr.sample_period != 0; |
| 1105 | } |
| 1106 | |
| 1107 | /* |
| 1108 | * Return 1 for a software event, 0 for a hardware event |
| 1109 | */ |
| 1110 | static inline int is_software_event(struct perf_event *event) |
| 1111 | { |
| 1112 | return event->event_caps & PERF_EV_CAP_SOFTWARE; |
| 1113 | } |
| 1114 | |
| 1115 | /* |
| 1116 | * Return 1 for event in sw context, 0 for event in hw context |
| 1117 | */ |
| 1118 | static inline int in_software_context(struct perf_event *event) |
| 1119 | { |
| 1120 | return event->ctx->pmu->task_ctx_nr == perf_sw_context; |
| 1121 | } |
| 1122 | |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 1123 | static inline int is_exclusive_pmu(struct pmu *pmu) |
| 1124 | { |
| 1125 | return pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE; |
| 1126 | } |
| 1127 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1128 | extern struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX]; |
| 1129 | |
| 1130 | extern void ___perf_sw_event(u32, u64, struct pt_regs *, u64); |
| 1131 | extern void __perf_sw_event(u32, u64, struct pt_regs *, u64); |
| 1132 | |
| 1133 | #ifndef perf_arch_fetch_caller_regs |
| 1134 | static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { } |
| 1135 | #endif |
| 1136 | |
| 1137 | /* |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 1138 | * When generating a perf sample in-line, instead of from an interrupt / |
| 1139 | * exception, we lack a pt_regs. This is typically used from software events |
| 1140 | * like: SW_CONTEXT_SWITCHES, SW_MIGRATIONS and the tie-in with tracepoints. |
| 1141 | * |
| 1142 | * We typically don't need a full set, but (for x86) do require: |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1143 | * - ip for PERF_SAMPLE_IP |
| 1144 | * - cs for user_mode() tests |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 1145 | * - sp for PERF_SAMPLE_CALLCHAIN |
| 1146 | * - eflags for MISC bits and CALLCHAIN (see: perf_hw_regs()) |
| 1147 | * |
| 1148 | * NOTE: assumes @regs is otherwise already 0 filled; this is important for |
| 1149 | * things like PERF_SAMPLE_REGS_INTR. |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1150 | */ |
| 1151 | static inline void perf_fetch_caller_regs(struct pt_regs *regs) |
| 1152 | { |
| 1153 | perf_arch_fetch_caller_regs(regs, CALLER_ADDR0); |
| 1154 | } |
| 1155 | |
| 1156 | static __always_inline void |
| 1157 | perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) |
| 1158 | { |
| 1159 | if (static_key_false(&perf_swevent_enabled[event_id])) |
| 1160 | __perf_sw_event(event_id, nr, regs, addr); |
| 1161 | } |
| 1162 | |
| 1163 | DECLARE_PER_CPU(struct pt_regs, __perf_regs[4]); |
| 1164 | |
| 1165 | /* |
| 1166 | * 'Special' version for the scheduler, it hard assumes no recursion, |
| 1167 | * which is guaranteed by us not actually scheduling inside other swevents |
| 1168 | * because those disable preemption. |
| 1169 | */ |
| 1170 | static __always_inline void |
| 1171 | perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) |
| 1172 | { |
| 1173 | if (static_key_false(&perf_swevent_enabled[event_id])) { |
| 1174 | struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]); |
| 1175 | |
| 1176 | perf_fetch_caller_regs(regs); |
| 1177 | ___perf_sw_event(event_id, nr, regs, addr); |
| 1178 | } |
| 1179 | } |
| 1180 | |
| 1181 | extern struct static_key_false perf_sched_events; |
| 1182 | |
| 1183 | static __always_inline bool |
| 1184 | perf_sw_migrate_enabled(void) |
| 1185 | { |
| 1186 | if (static_key_false(&perf_swevent_enabled[PERF_COUNT_SW_CPU_MIGRATIONS])) |
| 1187 | return true; |
| 1188 | return false; |
| 1189 | } |
| 1190 | |
| 1191 | static inline void perf_event_task_migrate(struct task_struct *task) |
| 1192 | { |
| 1193 | if (perf_sw_migrate_enabled()) |
| 1194 | task->sched_migrated = 1; |
| 1195 | } |
| 1196 | |
| 1197 | static inline void perf_event_task_sched_in(struct task_struct *prev, |
| 1198 | struct task_struct *task) |
| 1199 | { |
| 1200 | if (static_branch_unlikely(&perf_sched_events)) |
| 1201 | __perf_event_task_sched_in(prev, task); |
| 1202 | |
| 1203 | if (perf_sw_migrate_enabled() && task->sched_migrated) { |
| 1204 | struct pt_regs *regs = this_cpu_ptr(&__perf_regs[0]); |
| 1205 | |
| 1206 | perf_fetch_caller_regs(regs); |
| 1207 | ___perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, regs, 0); |
| 1208 | task->sched_migrated = 0; |
| 1209 | } |
| 1210 | } |
| 1211 | |
| 1212 | static inline void perf_event_task_sched_out(struct task_struct *prev, |
| 1213 | struct task_struct *next) |
| 1214 | { |
| 1215 | perf_sw_event_sched(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 0); |
| 1216 | |
| 1217 | if (static_branch_unlikely(&perf_sched_events)) |
| 1218 | __perf_event_task_sched_out(prev, next); |
| 1219 | } |
| 1220 | |
| 1221 | extern void perf_event_mmap(struct vm_area_struct *vma); |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 1222 | |
| 1223 | extern void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, |
| 1224 | bool unregister, const char *sym); |
| 1225 | extern void perf_event_bpf_event(struct bpf_prog *prog, |
| 1226 | enum perf_bpf_event_type type, |
| 1227 | u16 flags); |
| 1228 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1229 | extern struct perf_guest_info_callbacks __rcu *perf_guest_cbs; |
| 1230 | static inline struct perf_guest_info_callbacks *perf_get_guest_cbs(void) |
| 1231 | { |
| 1232 | /* |
| 1233 | * Callbacks are RCU-protected and must be READ_ONCE to avoid reloading |
| 1234 | * the callbacks between a !NULL check and dereferences, to ensure |
| 1235 | * pending stores/changes to the callback pointers are visible before a |
| 1236 | * non-NULL perf_guest_cbs is visible to readers, and to prevent a |
| 1237 | * module from unloading callbacks while readers are active. |
| 1238 | */ |
| 1239 | return rcu_dereference(perf_guest_cbs); |
| 1240 | } |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1241 | extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks); |
| 1242 | extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks); |
| 1243 | |
| 1244 | extern void perf_event_exec(void); |
| 1245 | extern void perf_event_comm(struct task_struct *tsk, bool exec); |
| 1246 | extern void perf_event_namespaces(struct task_struct *tsk); |
| 1247 | extern void perf_event_fork(struct task_struct *tsk); |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1248 | extern void perf_event_text_poke(const void *addr, |
| 1249 | const void *old_bytes, size_t old_len, |
| 1250 | const void *new_bytes, size_t new_len); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1251 | |
| 1252 | /* Callchains */ |
| 1253 | DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry); |
| 1254 | |
| 1255 | extern void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); |
| 1256 | extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs); |
| 1257 | extern struct perf_callchain_entry * |
| 1258 | get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user, |
| 1259 | u32 max_stack, bool crosstask, bool add_mark); |
| 1260 | extern struct perf_callchain_entry *perf_callchain(struct perf_event *event, struct pt_regs *regs); |
| 1261 | extern int get_callchain_buffers(int max_stack); |
| 1262 | extern void put_callchain_buffers(void); |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1263 | extern struct perf_callchain_entry *get_callchain_entry(int *rctx); |
| 1264 | extern void put_callchain_entry(int rctx); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1265 | |
| 1266 | extern int sysctl_perf_event_max_stack; |
| 1267 | extern int sysctl_perf_event_max_contexts_per_stack; |
| 1268 | |
| 1269 | static inline int perf_callchain_store_context(struct perf_callchain_entry_ctx *ctx, u64 ip) |
| 1270 | { |
| 1271 | if (ctx->contexts < sysctl_perf_event_max_contexts_per_stack) { |
| 1272 | struct perf_callchain_entry *entry = ctx->entry; |
| 1273 | entry->ip[entry->nr++] = ip; |
| 1274 | ++ctx->contexts; |
| 1275 | return 0; |
| 1276 | } else { |
| 1277 | ctx->contexts_maxed = true; |
| 1278 | return -1; /* no more room, stop walking the stack */ |
| 1279 | } |
| 1280 | } |
| 1281 | |
| 1282 | static inline int perf_callchain_store(struct perf_callchain_entry_ctx *ctx, u64 ip) |
| 1283 | { |
| 1284 | if (ctx->nr < ctx->max_stack && !ctx->contexts_maxed) { |
| 1285 | struct perf_callchain_entry *entry = ctx->entry; |
| 1286 | entry->ip[entry->nr++] = ip; |
| 1287 | ++ctx->nr; |
| 1288 | return 0; |
| 1289 | } else { |
| 1290 | return -1; /* no more room, stop walking the stack */ |
| 1291 | } |
| 1292 | } |
| 1293 | |
| 1294 | extern int sysctl_perf_event_paranoid; |
| 1295 | extern int sysctl_perf_event_mlock; |
| 1296 | extern int sysctl_perf_event_sample_rate; |
| 1297 | extern int sysctl_perf_cpu_time_max_percent; |
| 1298 | |
| 1299 | extern void perf_sample_event_took(u64 sample_len_ns); |
| 1300 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1301 | int perf_proc_update_handler(struct ctl_table *table, int write, |
| 1302 | void *buffer, size_t *lenp, loff_t *ppos); |
| 1303 | int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write, |
| 1304 | void *buffer, size_t *lenp, loff_t *ppos); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1305 | int perf_event_max_stack_handler(struct ctl_table *table, int write, |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1306 | void *buffer, size_t *lenp, loff_t *ppos); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1307 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1308 | /* Access to perf_event_open(2) syscall. */ |
| 1309 | #define PERF_SECURITY_OPEN 0 |
| 1310 | |
| 1311 | /* Finer grained perf_event_open(2) access control. */ |
| 1312 | #define PERF_SECURITY_CPU 1 |
| 1313 | #define PERF_SECURITY_KERNEL 2 |
| 1314 | #define PERF_SECURITY_TRACEPOINT 3 |
| 1315 | |
| 1316 | static inline int perf_is_paranoid(void) |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1317 | { |
| 1318 | return sysctl_perf_event_paranoid > -1; |
| 1319 | } |
| 1320 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1321 | static inline int perf_allow_kernel(struct perf_event_attr *attr) |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1322 | { |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1323 | if (sysctl_perf_event_paranoid > 1 && !perfmon_capable()) |
| 1324 | return -EACCES; |
| 1325 | |
| 1326 | return security_perf_event_open(attr, PERF_SECURITY_KERNEL); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1327 | } |
| 1328 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1329 | static inline int perf_allow_cpu(struct perf_event_attr *attr) |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1330 | { |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1331 | if (sysctl_perf_event_paranoid > 0 && !perfmon_capable()) |
| 1332 | return -EACCES; |
| 1333 | |
| 1334 | return security_perf_event_open(attr, PERF_SECURITY_CPU); |
| 1335 | } |
| 1336 | |
| 1337 | static inline int perf_allow_tracepoint(struct perf_event_attr *attr) |
| 1338 | { |
| 1339 | if (sysctl_perf_event_paranoid > -1 && !perfmon_capable()) |
| 1340 | return -EPERM; |
| 1341 | |
| 1342 | return security_perf_event_open(attr, PERF_SECURITY_TRACEPOINT); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1343 | } |
| 1344 | |
| 1345 | extern void perf_event_init(void); |
| 1346 | extern void perf_tp_event(u16 event_type, u64 count, void *record, |
| 1347 | int entry_size, struct pt_regs *regs, |
| 1348 | struct hlist_head *head, int rctx, |
| 1349 | struct task_struct *task); |
| 1350 | extern void perf_bp_event(struct perf_event *event, void *data); |
| 1351 | |
| 1352 | #ifndef perf_misc_flags |
| 1353 | # define perf_misc_flags(regs) \ |
| 1354 | (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL) |
| 1355 | # define perf_instruction_pointer(regs) instruction_pointer(regs) |
| 1356 | #endif |
| 1357 | #ifndef perf_arch_bpf_user_pt_regs |
| 1358 | # define perf_arch_bpf_user_pt_regs(regs) regs |
| 1359 | #endif |
| 1360 | |
| 1361 | static inline bool has_branch_stack(struct perf_event *event) |
| 1362 | { |
| 1363 | return event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK; |
| 1364 | } |
| 1365 | |
| 1366 | static inline bool needs_branch_stack(struct perf_event *event) |
| 1367 | { |
| 1368 | return event->attr.branch_sample_type != 0; |
| 1369 | } |
| 1370 | |
| 1371 | static inline bool has_aux(struct perf_event *event) |
| 1372 | { |
| 1373 | return event->pmu->setup_aux; |
| 1374 | } |
| 1375 | |
| 1376 | static inline bool is_write_backward(struct perf_event *event) |
| 1377 | { |
| 1378 | return !!event->attr.write_backward; |
| 1379 | } |
| 1380 | |
| 1381 | static inline bool has_addr_filter(struct perf_event *event) |
| 1382 | { |
| 1383 | return event->pmu->nr_addr_filters; |
| 1384 | } |
| 1385 | |
| 1386 | /* |
| 1387 | * An inherited event uses parent's filters |
| 1388 | */ |
| 1389 | static inline struct perf_addr_filters_head * |
| 1390 | perf_event_addr_filters(struct perf_event *event) |
| 1391 | { |
| 1392 | struct perf_addr_filters_head *ifh = &event->addr_filters; |
| 1393 | |
| 1394 | if (event->parent) |
| 1395 | ifh = &event->parent->addr_filters; |
| 1396 | |
| 1397 | return ifh; |
| 1398 | } |
| 1399 | |
| 1400 | extern void perf_event_addr_filters_sync(struct perf_event *event); |
| 1401 | |
| 1402 | extern int perf_output_begin(struct perf_output_handle *handle, |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1403 | struct perf_sample_data *data, |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1404 | struct perf_event *event, unsigned int size); |
| 1405 | extern int perf_output_begin_forward(struct perf_output_handle *handle, |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1406 | struct perf_sample_data *data, |
| 1407 | struct perf_event *event, |
| 1408 | unsigned int size); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1409 | extern int perf_output_begin_backward(struct perf_output_handle *handle, |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1410 | struct perf_sample_data *data, |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1411 | struct perf_event *event, |
| 1412 | unsigned int size); |
| 1413 | |
| 1414 | extern void perf_output_end(struct perf_output_handle *handle); |
| 1415 | extern unsigned int perf_output_copy(struct perf_output_handle *handle, |
| 1416 | const void *buf, unsigned int len); |
| 1417 | extern unsigned int perf_output_skip(struct perf_output_handle *handle, |
| 1418 | unsigned int len); |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1419 | extern long perf_output_copy_aux(struct perf_output_handle *aux_handle, |
| 1420 | struct perf_output_handle *handle, |
| 1421 | unsigned long from, unsigned long to); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1422 | extern int perf_swevent_get_recursion_context(void); |
| 1423 | extern void perf_swevent_put_recursion_context(int rctx); |
| 1424 | extern u64 perf_swevent_set_period(struct perf_event *event); |
| 1425 | extern void perf_event_enable(struct perf_event *event); |
| 1426 | extern void perf_event_disable(struct perf_event *event); |
| 1427 | extern void perf_event_disable_local(struct perf_event *event); |
| 1428 | extern void perf_event_disable_inatomic(struct perf_event *event); |
| 1429 | extern void perf_event_task_tick(void); |
| 1430 | extern int perf_event_account_interrupt(struct perf_event *event); |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1431 | extern int perf_event_period(struct perf_event *event, u64 value); |
| 1432 | extern u64 perf_event_pause(struct perf_event *event, bool reset); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1433 | #else /* !CONFIG_PERF_EVENTS: */ |
| 1434 | static inline void * |
| 1435 | perf_aux_output_begin(struct perf_output_handle *handle, |
| 1436 | struct perf_event *event) { return NULL; } |
| 1437 | static inline void |
| 1438 | perf_aux_output_end(struct perf_output_handle *handle, unsigned long size) |
| 1439 | { } |
| 1440 | static inline int |
| 1441 | perf_aux_output_skip(struct perf_output_handle *handle, |
| 1442 | unsigned long size) { return -EINVAL; } |
| 1443 | static inline void * |
| 1444 | perf_get_aux(struct perf_output_handle *handle) { return NULL; } |
| 1445 | static inline void |
| 1446 | perf_event_task_migrate(struct task_struct *task) { } |
| 1447 | static inline void |
| 1448 | perf_event_task_sched_in(struct task_struct *prev, |
| 1449 | struct task_struct *task) { } |
| 1450 | static inline void |
| 1451 | perf_event_task_sched_out(struct task_struct *prev, |
| 1452 | struct task_struct *next) { } |
| 1453 | static inline int perf_event_init_task(struct task_struct *child) { return 0; } |
| 1454 | static inline void perf_event_exit_task(struct task_struct *child) { } |
| 1455 | static inline void perf_event_free_task(struct task_struct *task) { } |
| 1456 | static inline void perf_event_delayed_put(struct task_struct *task) { } |
| 1457 | static inline struct file *perf_event_get(unsigned int fd) { return ERR_PTR(-EINVAL); } |
| 1458 | static inline const struct perf_event *perf_get_event(struct file *file) |
| 1459 | { |
| 1460 | return ERR_PTR(-EINVAL); |
| 1461 | } |
| 1462 | static inline const struct perf_event_attr *perf_event_attrs(struct perf_event *event) |
| 1463 | { |
| 1464 | return ERR_PTR(-EINVAL); |
| 1465 | } |
| 1466 | static inline int perf_event_read_local(struct perf_event *event, u64 *value, |
| 1467 | u64 *enabled, u64 *running) |
| 1468 | { |
| 1469 | return -EINVAL; |
| 1470 | } |
| 1471 | static inline void perf_event_print_debug(void) { } |
| 1472 | static inline int perf_event_task_disable(void) { return -EINVAL; } |
| 1473 | static inline int perf_event_task_enable(void) { return -EINVAL; } |
| 1474 | static inline int perf_event_refresh(struct perf_event *event, int refresh) |
| 1475 | { |
| 1476 | return -EINVAL; |
| 1477 | } |
| 1478 | |
| 1479 | static inline void |
| 1480 | perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { } |
| 1481 | static inline void |
| 1482 | perf_sw_event_sched(u32 event_id, u64 nr, u64 addr) { } |
| 1483 | static inline void |
| 1484 | perf_bp_event(struct perf_event *event, void *data) { } |
| 1485 | |
| 1486 | static inline int perf_register_guest_info_callbacks |
| 1487 | (struct perf_guest_info_callbacks *callbacks) { return 0; } |
| 1488 | static inline int perf_unregister_guest_info_callbacks |
| 1489 | (struct perf_guest_info_callbacks *callbacks) { return 0; } |
| 1490 | |
| 1491 | static inline void perf_event_mmap(struct vm_area_struct *vma) { } |
David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 1492 | |
| 1493 | typedef int (perf_ksymbol_get_name_f)(char *name, int name_len, void *data); |
| 1494 | static inline void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, |
| 1495 | bool unregister, const char *sym) { } |
| 1496 | static inline void perf_event_bpf_event(struct bpf_prog *prog, |
| 1497 | enum perf_bpf_event_type type, |
| 1498 | u16 flags) { } |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1499 | static inline void perf_event_exec(void) { } |
| 1500 | static inline void perf_event_comm(struct task_struct *tsk, bool exec) { } |
| 1501 | static inline void perf_event_namespaces(struct task_struct *tsk) { } |
| 1502 | static inline void perf_event_fork(struct task_struct *tsk) { } |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1503 | static inline void perf_event_text_poke(const void *addr, |
| 1504 | const void *old_bytes, |
| 1505 | size_t old_len, |
| 1506 | const void *new_bytes, |
| 1507 | size_t new_len) { } |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1508 | static inline void perf_event_init(void) { } |
| 1509 | static inline int perf_swevent_get_recursion_context(void) { return -1; } |
| 1510 | static inline void perf_swevent_put_recursion_context(int rctx) { } |
| 1511 | static inline u64 perf_swevent_set_period(struct perf_event *event) { return 0; } |
| 1512 | static inline void perf_event_enable(struct perf_event *event) { } |
| 1513 | static inline void perf_event_disable(struct perf_event *event) { } |
| 1514 | static inline int __perf_event_disable(void *info) { return -1; } |
| 1515 | static inline void perf_event_task_tick(void) { } |
| 1516 | static inline int perf_event_release_kernel(struct perf_event *event) { return 0; } |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1517 | static inline int perf_event_period(struct perf_event *event, u64 value) |
| 1518 | { |
| 1519 | return -EINVAL; |
| 1520 | } |
| 1521 | static inline u64 perf_event_pause(struct perf_event *event, bool reset) |
| 1522 | { |
| 1523 | return 0; |
| 1524 | } |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1525 | #endif |
| 1526 | |
| 1527 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL) |
| 1528 | extern void perf_restore_debug_store(void); |
| 1529 | #else |
| 1530 | static inline void perf_restore_debug_store(void) { } |
| 1531 | #endif |
| 1532 | |
| 1533 | static __always_inline bool perf_raw_frag_last(const struct perf_raw_frag *frag) |
| 1534 | { |
| 1535 | return frag->pad < sizeof(u64); |
| 1536 | } |
| 1537 | |
| 1538 | #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x)) |
| 1539 | |
| 1540 | struct perf_pmu_events_attr { |
| 1541 | struct device_attribute attr; |
| 1542 | u64 id; |
| 1543 | const char *event_str; |
| 1544 | }; |
| 1545 | |
| 1546 | struct perf_pmu_events_ht_attr { |
| 1547 | struct device_attribute attr; |
| 1548 | u64 id; |
| 1549 | const char *event_str_ht; |
| 1550 | const char *event_str_noht; |
| 1551 | }; |
| 1552 | |
| 1553 | ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr, |
| 1554 | char *page); |
| 1555 | |
| 1556 | #define PMU_EVENT_ATTR(_name, _var, _id, _show) \ |
| 1557 | static struct perf_pmu_events_attr _var = { \ |
| 1558 | .attr = __ATTR(_name, 0444, _show, NULL), \ |
| 1559 | .id = _id, \ |
| 1560 | }; |
| 1561 | |
| 1562 | #define PMU_EVENT_ATTR_STRING(_name, _var, _str) \ |
| 1563 | static struct perf_pmu_events_attr _var = { \ |
| 1564 | .attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \ |
| 1565 | .id = 0, \ |
| 1566 | .event_str = _str, \ |
| 1567 | }; |
| 1568 | |
| 1569 | #define PMU_FORMAT_ATTR(_name, _format) \ |
| 1570 | static ssize_t \ |
| 1571 | _name##_show(struct device *dev, \ |
| 1572 | struct device_attribute *attr, \ |
| 1573 | char *page) \ |
| 1574 | { \ |
| 1575 | BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \ |
| 1576 | return sprintf(page, _format "\n"); \ |
| 1577 | } \ |
| 1578 | \ |
| 1579 | static struct device_attribute format_attr_##_name = __ATTR_RO(_name) |
| 1580 | |
| 1581 | /* Performance counter hotplug functions */ |
| 1582 | #ifdef CONFIG_PERF_EVENTS |
| 1583 | int perf_event_init_cpu(unsigned int cpu); |
| 1584 | int perf_event_exit_cpu(unsigned int cpu); |
| 1585 | #else |
| 1586 | #define perf_event_init_cpu NULL |
| 1587 | #define perf_event_exit_cpu NULL |
| 1588 | #endif |
| 1589 | |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1590 | extern void __weak arch_perf_update_userpage(struct perf_event *event, |
| 1591 | struct perf_event_mmap_page *userpg, |
| 1592 | u64 now); |
| 1593 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1594 | #endif /* _LINUX_PERF_EVENT_H */ |