1 // SPDX-License-Identifier: GPL-2.0 2 3 #ifndef _LINUX_KERNEL_TRACE_H 4 #define _LINUX_KERNEL_TRACE_H 5 6 #include <linux/fs.h> 7 #include <linux/atomic.h> 8 #include <linux/sched.h> 9 #include <linux/clocksource.h> 10 #include <linux/ring_buffer.h> 11 #include <linux/mmiotrace.h> 12 #include <linux/tracepoint.h> 13 #include <linux/ftrace.h> 14 #include <linux/trace.h> 15 #include <linux/hw_breakpoint.h> 16 #include <linux/trace_seq.h> 17 #include <linux/trace_events.h> 18 #include <linux/compiler.h> 19 #include <linux/glob.h> 20 #include <linux/irq_work.h> 21 #include <linux/workqueue.h> 22 #include <linux/ctype.h> 23 24 #ifdef CONFIG_FTRACE_SYSCALLS 25 #include <asm/unistd.h> /* For NR_SYSCALLS */ 26 #include <asm/syscall.h> /* some archs define it here */ 27 #endif 28 29 enum trace_type { 30 __TRACE_FIRST_TYPE = 0, 31 32 TRACE_FN, 33 TRACE_CTX, 34 TRACE_WAKE, 35 TRACE_STACK, 36 TRACE_PRINT, 37 TRACE_BPRINT, 38 TRACE_MMIO_RW, 39 TRACE_MMIO_MAP, 40 TRACE_BRANCH, 41 TRACE_GRAPH_RET, 42 TRACE_GRAPH_ENT, 43 TRACE_USER_STACK, 44 TRACE_BLK, 45 TRACE_BPUTS, 46 TRACE_HWLAT, 47 TRACE_RAW_DATA, 48 TRACE_FUNC_REPEATS, 49 50 __TRACE_LAST_TYPE, 51 }; 52 53 54 #undef __field 55 #define __field(type, item) type item; 56 57 #undef __field_fn 58 #define __field_fn(type, item) type item; 59 60 #undef __field_struct 61 #define __field_struct(type, item) __field(type, item) 62 63 #undef __field_desc 64 #define __field_desc(type, container, item) 65 66 #undef __field_packed 67 #define __field_packed(type, container, item) 68 69 #undef __array 70 #define __array(type, item, size) type item[size]; 71 72 #undef __array_desc 73 #define __array_desc(type, container, item, size) 74 75 #undef __dynamic_array 76 #define __dynamic_array(type, item) type item[]; 77 78 #undef F_STRUCT 79 #define F_STRUCT(args...) args 80 81 #undef FTRACE_ENTRY 82 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 83 struct struct_name { \ 84 struct trace_entry ent; \ 85 tstruct \ 86 } 87 88 #undef FTRACE_ENTRY_DUP 89 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 90 91 #undef FTRACE_ENTRY_REG 92 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ 93 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 94 95 #undef FTRACE_ENTRY_PACKED 96 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ 97 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed 98 99 #include "trace_entries.h" 100 101 /* Use this for memory failure errors */ 102 #define MEM_FAIL(condition, fmt, ...) ({ \ 103 static bool __section(".data.once") __warned; \ 104 int __ret_warn_once = !!(condition); \ 105 \ 106 if (unlikely(__ret_warn_once && !__warned)) { \ 107 __warned = true; \ 108 pr_err("ERROR: " fmt, ##__VA_ARGS__); \ 109 } \ 110 unlikely(__ret_warn_once); \ 111 }) 112 113 /* 114 * syscalls are special, and need special handling, this is why 115 * they are not included in trace_entries.h 116 */ 117 struct syscall_trace_enter { 118 struct trace_entry ent; 119 int nr; 120 unsigned long args[]; 121 }; 122 123 struct syscall_trace_exit { 124 struct trace_entry ent; 125 int nr; 126 long ret; 127 }; 128 129 struct kprobe_trace_entry_head { 130 struct trace_entry ent; 131 unsigned long ip; 132 }; 133 134 struct kretprobe_trace_entry_head { 135 struct trace_entry ent; 136 unsigned long func; 137 unsigned long ret_ip; 138 }; 139 140 #define TRACE_BUF_SIZE 1024 141 142 struct trace_array; 143 144 /* 145 * The CPU trace array - it consists of thousands of trace entries 146 * plus some other descriptor data: (for example which task started 147 * the trace, etc.) 148 */ 149 struct trace_array_cpu { 150 atomic_t disabled; 151 void *buffer_page; /* ring buffer spare */ 152 153 unsigned long entries; 154 unsigned long saved_latency; 155 unsigned long critical_start; 156 unsigned long critical_end; 157 unsigned long critical_sequence; 158 unsigned long nice; 159 unsigned long policy; 160 unsigned long rt_priority; 161 unsigned long skipped_entries; 162 u64 preempt_timestamp; 163 pid_t pid; 164 kuid_t uid; 165 char comm[TASK_COMM_LEN]; 166 167 #ifdef CONFIG_FUNCTION_TRACER 168 int ftrace_ignore_pid; 169 #endif 170 bool ignore_pid; 171 }; 172 173 struct tracer; 174 struct trace_option_dentry; 175 176 struct array_buffer { 177 struct trace_array *tr; 178 struct trace_buffer *buffer; 179 struct trace_array_cpu __percpu *data; 180 u64 time_start; 181 int cpu; 182 }; 183 184 #define TRACE_FLAGS_MAX_SIZE 32 185 186 struct trace_options { 187 struct tracer *tracer; 188 struct trace_option_dentry *topts; 189 }; 190 191 struct trace_pid_list { 192 int pid_max; 193 unsigned long *pids; 194 }; 195 196 enum { 197 TRACE_PIDS = BIT(0), 198 TRACE_NO_PIDS = BIT(1), 199 }; 200 201 static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, 202 struct trace_pid_list *no_pid_list) 203 { 204 /* Return true if the pid list in type has pids */ 205 return ((type & TRACE_PIDS) && pid_list) || 206 ((type & TRACE_NO_PIDS) && no_pid_list); 207 } 208 209 static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, 210 struct trace_pid_list *no_pid_list) 211 { 212 /* 213 * Turning off what is in @type, return true if the "other" 214 * pid list, still has pids in it. 215 */ 216 return (!(type & TRACE_PIDS) && pid_list) || 217 (!(type & TRACE_NO_PIDS) && no_pid_list); 218 } 219 220 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 221 222 /** 223 * struct cond_snapshot - conditional snapshot data and callback 224 * 225 * The cond_snapshot structure encapsulates a callback function and 226 * data associated with the snapshot for a given tracing instance. 227 * 228 * When a snapshot is taken conditionally, by invoking 229 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 230 * passed in turn to the cond_snapshot.update() function. That data 231 * can be compared by the update() implementation with the cond_data 232 * contained within the struct cond_snapshot instance associated with 233 * the trace_array. Because the tr->max_lock is held throughout the 234 * update() call, the update() function can directly retrieve the 235 * cond_snapshot and cond_data associated with the per-instance 236 * snapshot associated with the trace_array. 237 * 238 * The cond_snapshot.update() implementation can save data to be 239 * associated with the snapshot if it decides to, and returns 'true' 240 * in that case, or it returns 'false' if the conditional snapshot 241 * shouldn't be taken. 242 * 243 * The cond_snapshot instance is created and associated with the 244 * user-defined cond_data by tracing_cond_snapshot_enable(). 245 * Likewise, the cond_snapshot instance is destroyed and is no longer 246 * associated with the trace instance by 247 * tracing_cond_snapshot_disable(). 248 * 249 * The method below is required. 250 * 251 * @update: When a conditional snapshot is invoked, the update() 252 * callback function is invoked with the tr->max_lock held. The 253 * update() implementation signals whether or not to actually 254 * take the snapshot, by returning 'true' if so, 'false' if no 255 * snapshot should be taken. Because the max_lock is held for 256 * the duration of update(), the implementation is safe to 257 * directly retrieved and save any implementation data it needs 258 * to in association with the snapshot. 259 */ 260 struct cond_snapshot { 261 void *cond_data; 262 cond_update_fn_t update; 263 }; 264 265 /* 266 * struct trace_func_repeats - used to keep track of the consecutive 267 * (on the same CPU) calls of a single function. 268 */ 269 struct trace_func_repeats { 270 unsigned long ip; 271 unsigned long parent_ip; 272 unsigned long count; 273 u64 ts_last_call; 274 }; 275 276 /* 277 * The trace array - an array of per-CPU trace arrays. This is the 278 * highest level data structure that individual tracers deal with. 279 * They have on/off state as well: 280 */ 281 struct trace_array { 282 struct list_head list; 283 char *name; 284 struct array_buffer array_buffer; 285 #ifdef CONFIG_TRACER_MAX_TRACE 286 /* 287 * The max_buffer is used to snapshot the trace when a maximum 288 * latency is reached, or when the user initiates a snapshot. 289 * Some tracers will use this to store a maximum trace while 290 * it continues examining live traces. 291 * 292 * The buffers for the max_buffer are set up the same as the array_buffer 293 * When a snapshot is taken, the buffer of the max_buffer is swapped 294 * with the buffer of the array_buffer and the buffers are reset for 295 * the array_buffer so the tracing can continue. 296 */ 297 struct array_buffer max_buffer; 298 bool allocated_snapshot; 299 #endif 300 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) 301 unsigned long max_latency; 302 #ifdef CONFIG_FSNOTIFY 303 struct dentry *d_max_latency; 304 struct work_struct fsnotify_work; 305 struct irq_work fsnotify_irqwork; 306 #endif 307 #endif 308 struct trace_pid_list __rcu *filtered_pids; 309 struct trace_pid_list __rcu *filtered_no_pids; 310 /* 311 * max_lock is used to protect the swapping of buffers 312 * when taking a max snapshot. The buffers themselves are 313 * protected by per_cpu spinlocks. But the action of the swap 314 * needs its own lock. 315 * 316 * This is defined as a arch_spinlock_t in order to help 317 * with performance when lockdep debugging is enabled. 318 * 319 * It is also used in other places outside the update_max_tr 320 * so it needs to be defined outside of the 321 * CONFIG_TRACER_MAX_TRACE. 322 */ 323 arch_spinlock_t max_lock; 324 int buffer_disabled; 325 #ifdef CONFIG_FTRACE_SYSCALLS 326 int sys_refcount_enter; 327 int sys_refcount_exit; 328 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 329 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 330 #endif 331 int stop_count; 332 int clock_id; 333 int nr_topts; 334 bool clear_trace; 335 int buffer_percent; 336 unsigned int n_err_log_entries; 337 struct tracer *current_trace; 338 unsigned int trace_flags; 339 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 340 unsigned int flags; 341 raw_spinlock_t start_lock; 342 struct list_head err_log; 343 struct dentry *dir; 344 struct dentry *options; 345 struct dentry *percpu_dir; 346 struct dentry *event_dir; 347 struct trace_options *topts; 348 struct list_head systems; 349 struct list_head events; 350 struct trace_event_file *trace_marker_file; 351 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 352 int ref; 353 int trace_ref; 354 #ifdef CONFIG_FUNCTION_TRACER 355 struct ftrace_ops *ops; 356 struct trace_pid_list __rcu *function_pids; 357 struct trace_pid_list __rcu *function_no_pids; 358 #ifdef CONFIG_DYNAMIC_FTRACE 359 /* All of these are protected by the ftrace_lock */ 360 struct list_head func_probes; 361 struct list_head mod_trace; 362 struct list_head mod_notrace; 363 #endif 364 /* function tracing enabled */ 365 int function_enabled; 366 #endif 367 int no_filter_buffering_ref; 368 struct list_head hist_vars; 369 #ifdef CONFIG_TRACER_SNAPSHOT 370 struct cond_snapshot *cond_snapshot; 371 #endif 372 struct trace_func_repeats __percpu *last_func_repeats; 373 }; 374 375 enum { 376 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 377 }; 378 379 extern struct list_head ftrace_trace_arrays; 380 381 extern struct mutex trace_types_lock; 382 383 extern int trace_array_get(struct trace_array *tr); 384 extern int tracing_check_open_get_tr(struct trace_array *tr); 385 extern struct trace_array *trace_array_find(const char *instance); 386 extern struct trace_array *trace_array_find_get(const char *instance); 387 388 extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe); 389 extern int tracing_set_filter_buffering(struct trace_array *tr, bool set); 390 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 391 392 extern bool trace_clock_in_ns(struct trace_array *tr); 393 394 /* 395 * The global tracer (top) should be the first trace array added, 396 * but we check the flag anyway. 397 */ 398 static inline struct trace_array *top_trace_array(void) 399 { 400 struct trace_array *tr; 401 402 if (list_empty(&ftrace_trace_arrays)) 403 return NULL; 404 405 tr = list_entry(ftrace_trace_arrays.prev, 406 typeof(*tr), list); 407 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 408 return tr; 409 } 410 411 #define FTRACE_CMP_TYPE(var, type) \ 412 __builtin_types_compatible_p(typeof(var), type *) 413 414 #undef IF_ASSIGN 415 #define IF_ASSIGN(var, entry, etype, id) \ 416 if (FTRACE_CMP_TYPE(var, etype)) { \ 417 var = (typeof(var))(entry); \ 418 WARN_ON(id != 0 && (entry)->type != id); \ 419 break; \ 420 } 421 422 /* Will cause compile errors if type is not found. */ 423 extern void __ftrace_bad_type(void); 424 425 /* 426 * The trace_assign_type is a verifier that the entry type is 427 * the same as the type being assigned. To add new types simply 428 * add a line with the following format: 429 * 430 * IF_ASSIGN(var, ent, type, id); 431 * 432 * Where "type" is the trace type that includes the trace_entry 433 * as the "ent" item. And "id" is the trace identifier that is 434 * used in the trace_type enum. 435 * 436 * If the type can have more than one id, then use zero. 437 */ 438 #define trace_assign_type(var, ent) \ 439 do { \ 440 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 441 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 442 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 443 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 444 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 445 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 446 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 447 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 448 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 449 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 450 TRACE_MMIO_RW); \ 451 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 452 TRACE_MMIO_MAP); \ 453 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 454 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 455 TRACE_GRAPH_ENT); \ 456 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 457 TRACE_GRAPH_RET); \ 458 IF_ASSIGN(var, ent, struct func_repeats_entry, \ 459 TRACE_FUNC_REPEATS); \ 460 __ftrace_bad_type(); \ 461 } while (0) 462 463 /* 464 * An option specific to a tracer. This is a boolean value. 465 * The bit is the bit index that sets its value on the 466 * flags value in struct tracer_flags. 467 */ 468 struct tracer_opt { 469 const char *name; /* Will appear on the trace_options file */ 470 u32 bit; /* Mask assigned in val field in tracer_flags */ 471 }; 472 473 /* 474 * The set of specific options for a tracer. Your tracer 475 * have to set the initial value of the flags val. 476 */ 477 struct tracer_flags { 478 u32 val; 479 struct tracer_opt *opts; 480 struct tracer *trace; 481 }; 482 483 /* Makes more easy to define a tracer opt */ 484 #define TRACER_OPT(s, b) .name = #s, .bit = b 485 486 487 struct trace_option_dentry { 488 struct tracer_opt *opt; 489 struct tracer_flags *flags; 490 struct trace_array *tr; 491 struct dentry *entry; 492 }; 493 494 /** 495 * struct tracer - a specific tracer and its callbacks to interact with tracefs 496 * @name: the name chosen to select it on the available_tracers file 497 * @init: called when one switches to this tracer (echo name > current_tracer) 498 * @reset: called when one switches to another tracer 499 * @start: called when tracing is unpaused (echo 1 > tracing_on) 500 * @stop: called when tracing is paused (echo 0 > tracing_on) 501 * @update_thresh: called when tracing_thresh is updated 502 * @open: called when the trace file is opened 503 * @pipe_open: called when the trace_pipe file is opened 504 * @close: called when the trace file is released 505 * @pipe_close: called when the trace_pipe file is released 506 * @read: override the default read callback on trace_pipe 507 * @splice_read: override the default splice_read callback on trace_pipe 508 * @selftest: selftest to run on boot (see trace_selftest.c) 509 * @print_headers: override the first lines that describe your columns 510 * @print_line: callback that prints a trace 511 * @set_flag: signals one of your private flags changed (trace_options file) 512 * @flags: your private flags 513 */ 514 struct tracer { 515 const char *name; 516 int (*init)(struct trace_array *tr); 517 void (*reset)(struct trace_array *tr); 518 void (*start)(struct trace_array *tr); 519 void (*stop)(struct trace_array *tr); 520 int (*update_thresh)(struct trace_array *tr); 521 void (*open)(struct trace_iterator *iter); 522 void (*pipe_open)(struct trace_iterator *iter); 523 void (*close)(struct trace_iterator *iter); 524 void (*pipe_close)(struct trace_iterator *iter); 525 ssize_t (*read)(struct trace_iterator *iter, 526 struct file *filp, char __user *ubuf, 527 size_t cnt, loff_t *ppos); 528 ssize_t (*splice_read)(struct trace_iterator *iter, 529 struct file *filp, 530 loff_t *ppos, 531 struct pipe_inode_info *pipe, 532 size_t len, 533 unsigned int flags); 534 #ifdef CONFIG_FTRACE_STARTUP_TEST 535 int (*selftest)(struct tracer *trace, 536 struct trace_array *tr); 537 #endif 538 void (*print_header)(struct seq_file *m); 539 enum print_line_t (*print_line)(struct trace_iterator *iter); 540 /* If you handled the flag setting, return 0 */ 541 int (*set_flag)(struct trace_array *tr, 542 u32 old_flags, u32 bit, int set); 543 /* Return 0 if OK with change, else return non-zero */ 544 int (*flag_changed)(struct trace_array *tr, 545 u32 mask, int set); 546 struct tracer *next; 547 struct tracer_flags *flags; 548 int enabled; 549 bool print_max; 550 bool allow_instances; 551 #ifdef CONFIG_TRACER_MAX_TRACE 552 bool use_max_tr; 553 #endif 554 /* True if tracer cannot be enabled in kernel param */ 555 bool noboot; 556 }; 557 558 static inline struct ring_buffer_iter * 559 trace_buffer_iter(struct trace_iterator *iter, int cpu) 560 { 561 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 562 } 563 564 int tracer_init(struct tracer *t, struct trace_array *tr); 565 int tracing_is_enabled(void); 566 void tracing_reset_online_cpus(struct array_buffer *buf); 567 void tracing_reset_current(int cpu); 568 void tracing_reset_all_online_cpus(void); 569 int tracing_open_generic(struct inode *inode, struct file *filp); 570 int tracing_open_generic_tr(struct inode *inode, struct file *filp); 571 bool tracing_is_disabled(void); 572 bool tracer_tracing_is_on(struct trace_array *tr); 573 void tracer_tracing_on(struct trace_array *tr); 574 void tracer_tracing_off(struct trace_array *tr); 575 struct dentry *trace_create_file(const char *name, 576 umode_t mode, 577 struct dentry *parent, 578 void *data, 579 const struct file_operations *fops); 580 581 int tracing_init_dentry(void); 582 583 struct ring_buffer_event; 584 585 struct ring_buffer_event * 586 trace_buffer_lock_reserve(struct trace_buffer *buffer, 587 int type, 588 unsigned long len, 589 unsigned int trace_ctx); 590 591 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 592 struct trace_array_cpu *data); 593 594 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 595 int *ent_cpu, u64 *ent_ts); 596 597 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, 598 struct ring_buffer_event *event); 599 600 bool trace_is_tracepoint_string(const char *str); 601 const char *trace_event_format(struct trace_iterator *iter, const char *fmt); 602 void trace_check_vprintf(struct trace_iterator *iter, const char *fmt, 603 va_list ap); 604 605 int trace_empty(struct trace_iterator *iter); 606 607 void *trace_find_next_entry_inc(struct trace_iterator *iter); 608 609 void trace_init_global_iter(struct trace_iterator *iter); 610 611 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 612 613 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 614 unsigned long trace_total_entries(struct trace_array *tr); 615 616 void trace_function(struct trace_array *tr, 617 unsigned long ip, 618 unsigned long parent_ip, 619 unsigned int trace_ctx); 620 void trace_graph_function(struct trace_array *tr, 621 unsigned long ip, 622 unsigned long parent_ip, 623 unsigned int trace_ctx); 624 void trace_latency_header(struct seq_file *m); 625 void trace_default_header(struct seq_file *m); 626 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 627 628 void trace_graph_return(struct ftrace_graph_ret *trace); 629 int trace_graph_entry(struct ftrace_graph_ent *trace); 630 void set_graph_array(struct trace_array *tr); 631 632 void tracing_start_cmdline_record(void); 633 void tracing_stop_cmdline_record(void); 634 void tracing_start_tgid_record(void); 635 void tracing_stop_tgid_record(void); 636 637 int register_tracer(struct tracer *type); 638 int is_tracing_stopped(void); 639 640 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 641 642 extern cpumask_var_t __read_mostly tracing_buffer_mask; 643 644 #define for_each_tracing_cpu(cpu) \ 645 for_each_cpu(cpu, tracing_buffer_mask) 646 647 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 648 649 extern unsigned long tracing_thresh; 650 651 /* PID filtering */ 652 653 extern int pid_max; 654 655 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 656 pid_t search_pid); 657 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 658 struct trace_pid_list *filtered_no_pids, 659 struct task_struct *task); 660 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 661 struct task_struct *self, 662 struct task_struct *task); 663 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 664 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 665 int trace_pid_show(struct seq_file *m, void *v); 666 void trace_free_pid_list(struct trace_pid_list *pid_list); 667 int trace_pid_write(struct trace_pid_list *filtered_pids, 668 struct trace_pid_list **new_pid_list, 669 const char __user *ubuf, size_t cnt); 670 671 #ifdef CONFIG_TRACER_MAX_TRACE 672 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 673 void *cond_data); 674 void update_max_tr_single(struct trace_array *tr, 675 struct task_struct *tsk, int cpu); 676 #endif /* CONFIG_TRACER_MAX_TRACE */ 677 678 #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ 679 defined(CONFIG_FSNOTIFY) 680 681 void latency_fsnotify(struct trace_array *tr); 682 683 #else 684 685 static inline void latency_fsnotify(struct trace_array *tr) { } 686 687 #endif 688 689 #ifdef CONFIG_STACKTRACE 690 void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip); 691 #else 692 static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, 693 int skip) 694 { 695 } 696 #endif /* CONFIG_STACKTRACE */ 697 698 void trace_last_func_repeats(struct trace_array *tr, 699 struct trace_func_repeats *last_info, 700 unsigned int trace_ctx); 701 702 extern u64 ftrace_now(int cpu); 703 704 extern void trace_find_cmdline(int pid, char comm[]); 705 extern int trace_find_tgid(int pid); 706 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 707 708 #ifdef CONFIG_DYNAMIC_FTRACE 709 extern unsigned long ftrace_update_tot_cnt; 710 extern unsigned long ftrace_number_of_pages; 711 extern unsigned long ftrace_number_of_groups; 712 void ftrace_init_trace_array(struct trace_array *tr); 713 #else 714 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 715 #endif 716 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 717 extern int DYN_FTRACE_TEST_NAME(void); 718 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 719 extern int DYN_FTRACE_TEST_NAME2(void); 720 721 extern bool ring_buffer_expanded; 722 extern bool tracing_selftest_disabled; 723 724 #ifdef CONFIG_FTRACE_STARTUP_TEST 725 extern void __init disable_tracing_selftest(const char *reason); 726 727 extern int trace_selftest_startup_function(struct tracer *trace, 728 struct trace_array *tr); 729 extern int trace_selftest_startup_function_graph(struct tracer *trace, 730 struct trace_array *tr); 731 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 732 struct trace_array *tr); 733 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 734 struct trace_array *tr); 735 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 736 struct trace_array *tr); 737 extern int trace_selftest_startup_wakeup(struct tracer *trace, 738 struct trace_array *tr); 739 extern int trace_selftest_startup_nop(struct tracer *trace, 740 struct trace_array *tr); 741 extern int trace_selftest_startup_branch(struct tracer *trace, 742 struct trace_array *tr); 743 /* 744 * Tracer data references selftest functions that only occur 745 * on boot up. These can be __init functions. Thus, when selftests 746 * are enabled, then the tracers need to reference __init functions. 747 */ 748 #define __tracer_data __refdata 749 #else 750 static inline void __init disable_tracing_selftest(const char *reason) 751 { 752 } 753 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 754 #define __tracer_data __read_mostly 755 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 756 757 extern void *head_page(struct trace_array_cpu *data); 758 extern unsigned long long ns2usecs(u64 nsec); 759 extern int 760 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 761 extern int 762 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 763 extern int 764 trace_array_vprintk(struct trace_array *tr, 765 unsigned long ip, const char *fmt, va_list args); 766 int trace_array_printk_buf(struct trace_buffer *buffer, 767 unsigned long ip, const char *fmt, ...); 768 void trace_printk_seq(struct trace_seq *s); 769 enum print_line_t print_trace_line(struct trace_iterator *iter); 770 771 extern char trace_find_mark(unsigned long long duration); 772 773 struct ftrace_hash; 774 775 struct ftrace_mod_load { 776 struct list_head list; 777 char *func; 778 char *module; 779 int enable; 780 }; 781 782 enum { 783 FTRACE_HASH_FL_MOD = (1 << 0), 784 }; 785 786 struct ftrace_hash { 787 unsigned long size_bits; 788 struct hlist_head *buckets; 789 unsigned long count; 790 unsigned long flags; 791 struct rcu_head rcu; 792 }; 793 794 struct ftrace_func_entry * 795 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 796 797 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 798 { 799 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 800 } 801 802 /* Standard output formatting function used for function return traces */ 803 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 804 805 /* Flag options */ 806 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 807 #define TRACE_GRAPH_PRINT_CPU 0x2 808 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 809 #define TRACE_GRAPH_PRINT_PROC 0x8 810 #define TRACE_GRAPH_PRINT_DURATION 0x10 811 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 812 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 813 #define TRACE_GRAPH_PRINT_IRQS 0x80 814 #define TRACE_GRAPH_PRINT_TAIL 0x100 815 #define TRACE_GRAPH_SLEEP_TIME 0x200 816 #define TRACE_GRAPH_GRAPH_TIME 0x400 817 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 818 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 819 820 extern void ftrace_graph_sleep_time_control(bool enable); 821 822 #ifdef CONFIG_FUNCTION_PROFILER 823 extern void ftrace_graph_graph_time_control(bool enable); 824 #else 825 static inline void ftrace_graph_graph_time_control(bool enable) { } 826 #endif 827 828 extern enum print_line_t 829 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 830 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 831 extern void 832 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 833 extern void graph_trace_open(struct trace_iterator *iter); 834 extern void graph_trace_close(struct trace_iterator *iter); 835 extern int __trace_graph_entry(struct trace_array *tr, 836 struct ftrace_graph_ent *trace, 837 unsigned int trace_ctx); 838 extern void __trace_graph_return(struct trace_array *tr, 839 struct ftrace_graph_ret *trace, 840 unsigned int trace_ctx); 841 842 #ifdef CONFIG_DYNAMIC_FTRACE 843 extern struct ftrace_hash __rcu *ftrace_graph_hash; 844 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; 845 846 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 847 { 848 unsigned long addr = trace->func; 849 int ret = 0; 850 struct ftrace_hash *hash; 851 852 preempt_disable_notrace(); 853 854 /* 855 * Have to open code "rcu_dereference_sched()" because the 856 * function graph tracer can be called when RCU is not 857 * "watching". 858 * Protected with schedule_on_each_cpu(ftrace_sync) 859 */ 860 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); 861 862 if (ftrace_hash_empty(hash)) { 863 ret = 1; 864 goto out; 865 } 866 867 if (ftrace_lookup_ip(hash, addr)) { 868 869 /* 870 * This needs to be cleared on the return functions 871 * when the depth is zero. 872 */ 873 trace_recursion_set(TRACE_GRAPH_BIT); 874 trace_recursion_set_depth(trace->depth); 875 876 /* 877 * If no irqs are to be traced, but a set_graph_function 878 * is set, and called by an interrupt handler, we still 879 * want to trace it. 880 */ 881 if (in_irq()) 882 trace_recursion_set(TRACE_IRQ_BIT); 883 else 884 trace_recursion_clear(TRACE_IRQ_BIT); 885 ret = 1; 886 } 887 888 out: 889 preempt_enable_notrace(); 890 return ret; 891 } 892 893 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 894 { 895 if (trace_recursion_test(TRACE_GRAPH_BIT) && 896 trace->depth == trace_recursion_depth()) 897 trace_recursion_clear(TRACE_GRAPH_BIT); 898 } 899 900 static inline int ftrace_graph_notrace_addr(unsigned long addr) 901 { 902 int ret = 0; 903 struct ftrace_hash *notrace_hash; 904 905 preempt_disable_notrace(); 906 907 /* 908 * Have to open code "rcu_dereference_sched()" because the 909 * function graph tracer can be called when RCU is not 910 * "watching". 911 * Protected with schedule_on_each_cpu(ftrace_sync) 912 */ 913 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, 914 !preemptible()); 915 916 if (ftrace_lookup_ip(notrace_hash, addr)) 917 ret = 1; 918 919 preempt_enable_notrace(); 920 return ret; 921 } 922 #else 923 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 924 { 925 return 1; 926 } 927 928 static inline int ftrace_graph_notrace_addr(unsigned long addr) 929 { 930 return 0; 931 } 932 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 933 { } 934 #endif /* CONFIG_DYNAMIC_FTRACE */ 935 936 extern unsigned int fgraph_max_depth; 937 938 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 939 { 940 /* trace it when it is-nested-in or is a function enabled. */ 941 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 942 ftrace_graph_addr(trace)) || 943 (trace->depth < 0) || 944 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 945 } 946 947 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 948 static inline enum print_line_t 949 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 950 { 951 return TRACE_TYPE_UNHANDLED; 952 } 953 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 954 955 extern struct list_head ftrace_pids; 956 957 #ifdef CONFIG_FUNCTION_TRACER 958 959 #define FTRACE_PID_IGNORE -1 960 #define FTRACE_PID_TRACE -2 961 962 struct ftrace_func_command { 963 struct list_head list; 964 char *name; 965 int (*func)(struct trace_array *tr, 966 struct ftrace_hash *hash, 967 char *func, char *cmd, 968 char *params, int enable); 969 }; 970 extern bool ftrace_filter_param __initdata; 971 static inline int ftrace_trace_task(struct trace_array *tr) 972 { 973 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) != 974 FTRACE_PID_IGNORE; 975 } 976 extern int ftrace_is_dead(void); 977 int ftrace_create_function_files(struct trace_array *tr, 978 struct dentry *parent); 979 void ftrace_destroy_function_files(struct trace_array *tr); 980 int ftrace_allocate_ftrace_ops(struct trace_array *tr); 981 void ftrace_free_ftrace_ops(struct trace_array *tr); 982 void ftrace_init_global_array_ops(struct trace_array *tr); 983 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 984 void ftrace_reset_array_ops(struct trace_array *tr); 985 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 986 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 987 struct dentry *d_tracer); 988 void ftrace_clear_pids(struct trace_array *tr); 989 int init_function_trace(void); 990 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 991 #else 992 static inline int ftrace_trace_task(struct trace_array *tr) 993 { 994 return 1; 995 } 996 static inline int ftrace_is_dead(void) { return 0; } 997 static inline int 998 ftrace_create_function_files(struct trace_array *tr, 999 struct dentry *parent) 1000 { 1001 return 0; 1002 } 1003 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) 1004 { 1005 return 0; 1006 } 1007 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } 1008 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1009 static inline __init void 1010 ftrace_init_global_array_ops(struct trace_array *tr) { } 1011 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1012 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1013 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1014 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1015 static inline int init_function_trace(void) { return 0; } 1016 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1017 /* ftace_func_t type is not defined, use macro instead of static inline */ 1018 #define ftrace_init_array_ops(tr, func) do { } while (0) 1019 #endif /* CONFIG_FUNCTION_TRACER */ 1020 1021 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1022 1023 struct ftrace_probe_ops { 1024 void (*func)(unsigned long ip, 1025 unsigned long parent_ip, 1026 struct trace_array *tr, 1027 struct ftrace_probe_ops *ops, 1028 void *data); 1029 int (*init)(struct ftrace_probe_ops *ops, 1030 struct trace_array *tr, 1031 unsigned long ip, void *init_data, 1032 void **data); 1033 void (*free)(struct ftrace_probe_ops *ops, 1034 struct trace_array *tr, 1035 unsigned long ip, void *data); 1036 int (*print)(struct seq_file *m, 1037 unsigned long ip, 1038 struct ftrace_probe_ops *ops, 1039 void *data); 1040 }; 1041 1042 struct ftrace_func_mapper; 1043 typedef int (*ftrace_mapper_func)(void *data); 1044 1045 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1046 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1047 unsigned long ip); 1048 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1049 unsigned long ip, void *data); 1050 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1051 unsigned long ip); 1052 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1053 ftrace_mapper_func free_func); 1054 1055 extern int 1056 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1057 struct ftrace_probe_ops *ops, void *data); 1058 extern int 1059 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1060 struct ftrace_probe_ops *ops); 1061 extern void clear_ftrace_function_probes(struct trace_array *tr); 1062 1063 int register_ftrace_command(struct ftrace_func_command *cmd); 1064 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1065 1066 void ftrace_create_filter_files(struct ftrace_ops *ops, 1067 struct dentry *parent); 1068 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1069 1070 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, 1071 int len, int reset); 1072 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, 1073 int len, int reset); 1074 #else 1075 struct ftrace_func_command; 1076 1077 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1078 { 1079 return -EINVAL; 1080 } 1081 static inline __init int unregister_ftrace_command(char *cmd_name) 1082 { 1083 return -EINVAL; 1084 } 1085 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1086 { 1087 } 1088 1089 /* 1090 * The ops parameter passed in is usually undefined. 1091 * This must be a macro. 1092 */ 1093 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1094 #define ftrace_destroy_filter_files(ops) do { } while (0) 1095 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1096 1097 bool ftrace_event_is_function(struct trace_event_call *call); 1098 1099 /* 1100 * struct trace_parser - servers for reading the user input separated by spaces 1101 * @cont: set if the input is not complete - no final space char was found 1102 * @buffer: holds the parsed user input 1103 * @idx: user input length 1104 * @size: buffer size 1105 */ 1106 struct trace_parser { 1107 bool cont; 1108 char *buffer; 1109 unsigned idx; 1110 unsigned size; 1111 }; 1112 1113 static inline bool trace_parser_loaded(struct trace_parser *parser) 1114 { 1115 return (parser->idx != 0); 1116 } 1117 1118 static inline bool trace_parser_cont(struct trace_parser *parser) 1119 { 1120 return parser->cont; 1121 } 1122 1123 static inline void trace_parser_clear(struct trace_parser *parser) 1124 { 1125 parser->cont = false; 1126 parser->idx = 0; 1127 } 1128 1129 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1130 extern void trace_parser_put(struct trace_parser *parser); 1131 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1132 size_t cnt, loff_t *ppos); 1133 1134 /* 1135 * Only create function graph options if function graph is configured. 1136 */ 1137 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1138 # define FGRAPH_FLAGS \ 1139 C(DISPLAY_GRAPH, "display-graph"), 1140 #else 1141 # define FGRAPH_FLAGS 1142 #endif 1143 1144 #ifdef CONFIG_BRANCH_TRACER 1145 # define BRANCH_FLAGS \ 1146 C(BRANCH, "branch"), 1147 #else 1148 # define BRANCH_FLAGS 1149 #endif 1150 1151 #ifdef CONFIG_FUNCTION_TRACER 1152 # define FUNCTION_FLAGS \ 1153 C(FUNCTION, "function-trace"), \ 1154 C(FUNC_FORK, "function-fork"), 1155 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1156 #else 1157 # define FUNCTION_FLAGS 1158 # define FUNCTION_DEFAULT_FLAGS 0UL 1159 # define TRACE_ITER_FUNC_FORK 0UL 1160 #endif 1161 1162 #ifdef CONFIG_STACKTRACE 1163 # define STACK_FLAGS \ 1164 C(STACKTRACE, "stacktrace"), 1165 #else 1166 # define STACK_FLAGS 1167 #endif 1168 1169 /* 1170 * trace_iterator_flags is an enumeration that defines bit 1171 * positions into trace_flags that controls the output. 1172 * 1173 * NOTE: These bits must match the trace_options array in 1174 * trace.c (this macro guarantees it). 1175 */ 1176 #define TRACE_FLAGS \ 1177 C(PRINT_PARENT, "print-parent"), \ 1178 C(SYM_OFFSET, "sym-offset"), \ 1179 C(SYM_ADDR, "sym-addr"), \ 1180 C(VERBOSE, "verbose"), \ 1181 C(RAW, "raw"), \ 1182 C(HEX, "hex"), \ 1183 C(BIN, "bin"), \ 1184 C(BLOCK, "block"), \ 1185 C(PRINTK, "trace_printk"), \ 1186 C(ANNOTATE, "annotate"), \ 1187 C(USERSTACKTRACE, "userstacktrace"), \ 1188 C(SYM_USEROBJ, "sym-userobj"), \ 1189 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1190 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1191 C(LATENCY_FMT, "latency-format"), \ 1192 C(RECORD_CMD, "record-cmd"), \ 1193 C(RECORD_TGID, "record-tgid"), \ 1194 C(OVERWRITE, "overwrite"), \ 1195 C(STOP_ON_FREE, "disable_on_free"), \ 1196 C(IRQ_INFO, "irq-info"), \ 1197 C(MARKERS, "markers"), \ 1198 C(EVENT_FORK, "event-fork"), \ 1199 C(PAUSE_ON_TRACE, "pause-on-trace"), \ 1200 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \ 1201 FUNCTION_FLAGS \ 1202 FGRAPH_FLAGS \ 1203 STACK_FLAGS \ 1204 BRANCH_FLAGS 1205 1206 /* 1207 * By defining C, we can make TRACE_FLAGS a list of bit names 1208 * that will define the bits for the flag masks. 1209 */ 1210 #undef C 1211 #define C(a, b) TRACE_ITER_##a##_BIT 1212 1213 enum trace_iterator_bits { 1214 TRACE_FLAGS 1215 /* Make sure we don't go more than we have bits for */ 1216 TRACE_ITER_LAST_BIT 1217 }; 1218 1219 /* 1220 * By redefining C, we can make TRACE_FLAGS a list of masks that 1221 * use the bits as defined above. 1222 */ 1223 #undef C 1224 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1225 1226 enum trace_iterator_flags { TRACE_FLAGS }; 1227 1228 /* 1229 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1230 * control the output of kernel symbols. 1231 */ 1232 #define TRACE_ITER_SYM_MASK \ 1233 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1234 1235 extern struct tracer nop_trace; 1236 1237 #ifdef CONFIG_BRANCH_TRACER 1238 extern int enable_branch_tracing(struct trace_array *tr); 1239 extern void disable_branch_tracing(void); 1240 static inline int trace_branch_enable(struct trace_array *tr) 1241 { 1242 if (tr->trace_flags & TRACE_ITER_BRANCH) 1243 return enable_branch_tracing(tr); 1244 return 0; 1245 } 1246 static inline void trace_branch_disable(void) 1247 { 1248 /* due to races, always disable */ 1249 disable_branch_tracing(); 1250 } 1251 #else 1252 static inline int trace_branch_enable(struct trace_array *tr) 1253 { 1254 return 0; 1255 } 1256 static inline void trace_branch_disable(void) 1257 { 1258 } 1259 #endif /* CONFIG_BRANCH_TRACER */ 1260 1261 /* set ring buffers to default size if not already done so */ 1262 int tracing_update_buffers(void); 1263 1264 struct ftrace_event_field { 1265 struct list_head link; 1266 const char *name; 1267 const char *type; 1268 int filter_type; 1269 int offset; 1270 int size; 1271 int is_signed; 1272 }; 1273 1274 struct prog_entry; 1275 1276 struct event_filter { 1277 struct prog_entry __rcu *prog; 1278 char *filter_string; 1279 }; 1280 1281 struct event_subsystem { 1282 struct list_head list; 1283 const char *name; 1284 struct event_filter *filter; 1285 int ref_count; 1286 }; 1287 1288 struct trace_subsystem_dir { 1289 struct list_head list; 1290 struct event_subsystem *subsystem; 1291 struct trace_array *tr; 1292 struct dentry *entry; 1293 int ref_count; 1294 int nr_events; 1295 }; 1296 1297 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1298 struct trace_buffer *buffer, 1299 struct ring_buffer_event *event); 1300 1301 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1302 struct trace_buffer *buffer, 1303 struct ring_buffer_event *event, 1304 unsigned int trcace_ctx, 1305 struct pt_regs *regs); 1306 1307 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1308 struct trace_buffer *buffer, 1309 struct ring_buffer_event *event, 1310 unsigned int trace_ctx) 1311 { 1312 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL); 1313 } 1314 1315 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1316 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1317 void trace_buffered_event_disable(void); 1318 void trace_buffered_event_enable(void); 1319 1320 static inline void 1321 __trace_event_discard_commit(struct trace_buffer *buffer, 1322 struct ring_buffer_event *event) 1323 { 1324 if (this_cpu_read(trace_buffered_event) == event) { 1325 /* Simply release the temp buffer */ 1326 this_cpu_dec(trace_buffered_event_cnt); 1327 return; 1328 } 1329 ring_buffer_discard_commit(buffer, event); 1330 } 1331 1332 /* 1333 * Helper function for event_trigger_unlock_commit{_regs}(). 1334 * If there are event triggers attached to this event that requires 1335 * filtering against its fields, then they will be called as the 1336 * entry already holds the field information of the current event. 1337 * 1338 * It also checks if the event should be discarded or not. 1339 * It is to be discarded if the event is soft disabled and the 1340 * event was only recorded to process triggers, or if the event 1341 * filter is active and this event did not match the filters. 1342 * 1343 * Returns true if the event is discarded, false otherwise. 1344 */ 1345 static inline bool 1346 __event_trigger_test_discard(struct trace_event_file *file, 1347 struct trace_buffer *buffer, 1348 struct ring_buffer_event *event, 1349 void *entry, 1350 enum event_trigger_type *tt) 1351 { 1352 unsigned long eflags = file->flags; 1353 1354 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1355 *tt = event_triggers_call(file, buffer, entry, event); 1356 1357 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || 1358 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && 1359 !filter_match_preds(file->filter, entry))) { 1360 __trace_event_discard_commit(buffer, event); 1361 return true; 1362 } 1363 1364 return false; 1365 } 1366 1367 /** 1368 * event_trigger_unlock_commit - handle triggers and finish event commit 1369 * @file: The file pointer associated with the event 1370 * @buffer: The ring buffer that the event is being written to 1371 * @event: The event meta data in the ring buffer 1372 * @entry: The event itself 1373 * @trace_ctx: The tracing context flags. 1374 * 1375 * This is a helper function to handle triggers that require data 1376 * from the event itself. It also tests the event against filters and 1377 * if the event is soft disabled and should be discarded. 1378 */ 1379 static inline void 1380 event_trigger_unlock_commit(struct trace_event_file *file, 1381 struct trace_buffer *buffer, 1382 struct ring_buffer_event *event, 1383 void *entry, unsigned int trace_ctx) 1384 { 1385 enum event_trigger_type tt = ETT_NONE; 1386 1387 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1388 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx); 1389 1390 if (tt) 1391 event_triggers_post_call(file, tt); 1392 } 1393 1394 /** 1395 * event_trigger_unlock_commit_regs - handle triggers and finish event commit 1396 * @file: The file pointer associated with the event 1397 * @buffer: The ring buffer that the event is being written to 1398 * @event: The event meta data in the ring buffer 1399 * @entry: The event itself 1400 * @trace_ctx: The tracing context flags. 1401 * 1402 * This is a helper function to handle triggers that require data 1403 * from the event itself. It also tests the event against filters and 1404 * if the event is soft disabled and should be discarded. 1405 * 1406 * Same as event_trigger_unlock_commit() but calls 1407 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). 1408 */ 1409 static inline void 1410 event_trigger_unlock_commit_regs(struct trace_event_file *file, 1411 struct trace_buffer *buffer, 1412 struct ring_buffer_event *event, 1413 void *entry, unsigned int trace_ctx, 1414 struct pt_regs *regs) 1415 { 1416 enum event_trigger_type tt = ETT_NONE; 1417 1418 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1419 trace_buffer_unlock_commit_regs(file->tr, buffer, event, 1420 trace_ctx, regs); 1421 1422 if (tt) 1423 event_triggers_post_call(file, tt); 1424 } 1425 1426 #define FILTER_PRED_INVALID ((unsigned short)-1) 1427 #define FILTER_PRED_IS_RIGHT (1 << 15) 1428 #define FILTER_PRED_FOLD (1 << 15) 1429 1430 /* 1431 * The max preds is the size of unsigned short with 1432 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1433 * and FOLD flags. The other is reserved. 1434 * 1435 * 2^14 preds is way more than enough. 1436 */ 1437 #define MAX_FILTER_PRED 16384 1438 1439 struct filter_pred; 1440 struct regex; 1441 1442 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1443 1444 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1445 1446 enum regex_type { 1447 MATCH_FULL = 0, 1448 MATCH_FRONT_ONLY, 1449 MATCH_MIDDLE_ONLY, 1450 MATCH_END_ONLY, 1451 MATCH_GLOB, 1452 MATCH_INDEX, 1453 }; 1454 1455 struct regex { 1456 char pattern[MAX_FILTER_STR_VAL]; 1457 int len; 1458 int field_len; 1459 regex_match_func match; 1460 }; 1461 1462 struct filter_pred { 1463 filter_pred_fn_t fn; 1464 u64 val; 1465 struct regex regex; 1466 unsigned short *ops; 1467 struct ftrace_event_field *field; 1468 int offset; 1469 int not; 1470 int op; 1471 }; 1472 1473 static inline bool is_string_field(struct ftrace_event_field *field) 1474 { 1475 return field->filter_type == FILTER_DYN_STRING || 1476 field->filter_type == FILTER_STATIC_STRING || 1477 field->filter_type == FILTER_PTR_STRING || 1478 field->filter_type == FILTER_COMM; 1479 } 1480 1481 static inline bool is_function_field(struct ftrace_event_field *field) 1482 { 1483 return field->filter_type == FILTER_TRACE_FN; 1484 } 1485 1486 extern enum regex_type 1487 filter_parse_regex(char *buff, int len, char **search, int *not); 1488 extern void print_event_filter(struct trace_event_file *file, 1489 struct trace_seq *s); 1490 extern int apply_event_filter(struct trace_event_file *file, 1491 char *filter_string); 1492 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1493 char *filter_string); 1494 extern void print_subsystem_event_filter(struct event_subsystem *system, 1495 struct trace_seq *s); 1496 extern int filter_assign_type(const char *type); 1497 extern int create_event_filter(struct trace_array *tr, 1498 struct trace_event_call *call, 1499 char *filter_str, bool set_str, 1500 struct event_filter **filterp); 1501 extern void free_event_filter(struct event_filter *filter); 1502 1503 struct ftrace_event_field * 1504 trace_find_event_field(struct trace_event_call *call, char *name); 1505 1506 extern void trace_event_enable_cmd_record(bool enable); 1507 extern void trace_event_enable_tgid_record(bool enable); 1508 1509 extern int event_trace_init(void); 1510 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1511 extern int event_trace_del_tracer(struct trace_array *tr); 1512 extern void __trace_early_add_events(struct trace_array *tr); 1513 1514 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1515 const char *system, 1516 const char *event); 1517 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1518 const char *system, 1519 const char *event); 1520 1521 static inline void *event_file_data(struct file *filp) 1522 { 1523 return READ_ONCE(file_inode(filp)->i_private); 1524 } 1525 1526 extern struct mutex event_mutex; 1527 extern struct list_head ftrace_events; 1528 1529 extern const struct file_operations event_trigger_fops; 1530 extern const struct file_operations event_hist_fops; 1531 extern const struct file_operations event_hist_debug_fops; 1532 extern const struct file_operations event_inject_fops; 1533 1534 #ifdef CONFIG_HIST_TRIGGERS 1535 extern int register_trigger_hist_cmd(void); 1536 extern int register_trigger_hist_enable_disable_cmds(void); 1537 #else 1538 static inline int register_trigger_hist_cmd(void) { return 0; } 1539 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1540 #endif 1541 1542 extern int register_trigger_cmds(void); 1543 extern void clear_event_triggers(struct trace_array *tr); 1544 1545 struct event_trigger_data { 1546 unsigned long count; 1547 int ref; 1548 struct event_trigger_ops *ops; 1549 struct event_command *cmd_ops; 1550 struct event_filter __rcu *filter; 1551 char *filter_str; 1552 void *private_data; 1553 bool paused; 1554 bool paused_tmp; 1555 struct list_head list; 1556 char *name; 1557 struct list_head named_list; 1558 struct event_trigger_data *named_data; 1559 }; 1560 1561 /* Avoid typos */ 1562 #define ENABLE_EVENT_STR "enable_event" 1563 #define DISABLE_EVENT_STR "disable_event" 1564 #define ENABLE_HIST_STR "enable_hist" 1565 #define DISABLE_HIST_STR "disable_hist" 1566 1567 struct enable_trigger_data { 1568 struct trace_event_file *file; 1569 bool enable; 1570 bool hist; 1571 }; 1572 1573 extern int event_enable_trigger_print(struct seq_file *m, 1574 struct event_trigger_ops *ops, 1575 struct event_trigger_data *data); 1576 extern void event_enable_trigger_free(struct event_trigger_ops *ops, 1577 struct event_trigger_data *data); 1578 extern int event_enable_trigger_func(struct event_command *cmd_ops, 1579 struct trace_event_file *file, 1580 char *glob, char *cmd, char *param); 1581 extern int event_enable_register_trigger(char *glob, 1582 struct event_trigger_ops *ops, 1583 struct event_trigger_data *data, 1584 struct trace_event_file *file); 1585 extern void event_enable_unregister_trigger(char *glob, 1586 struct event_trigger_ops *ops, 1587 struct event_trigger_data *test, 1588 struct trace_event_file *file); 1589 extern void trigger_data_free(struct event_trigger_data *data); 1590 extern int event_trigger_init(struct event_trigger_ops *ops, 1591 struct event_trigger_data *data); 1592 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1593 int trigger_enable); 1594 extern void update_cond_flag(struct trace_event_file *file); 1595 extern int set_trigger_filter(char *filter_str, 1596 struct event_trigger_data *trigger_data, 1597 struct trace_event_file *file); 1598 extern struct event_trigger_data *find_named_trigger(const char *name); 1599 extern bool is_named_trigger(struct event_trigger_data *test); 1600 extern int save_named_trigger(const char *name, 1601 struct event_trigger_data *data); 1602 extern void del_named_trigger(struct event_trigger_data *data); 1603 extern void pause_named_trigger(struct event_trigger_data *data); 1604 extern void unpause_named_trigger(struct event_trigger_data *data); 1605 extern void set_named_trigger_data(struct event_trigger_data *data, 1606 struct event_trigger_data *named_data); 1607 extern struct event_trigger_data * 1608 get_named_trigger_data(struct event_trigger_data *data); 1609 extern int register_event_command(struct event_command *cmd); 1610 extern int unregister_event_command(struct event_command *cmd); 1611 extern int register_trigger_hist_enable_disable_cmds(void); 1612 1613 /** 1614 * struct event_trigger_ops - callbacks for trace event triggers 1615 * 1616 * The methods in this structure provide per-event trigger hooks for 1617 * various trigger operations. 1618 * 1619 * All the methods below, except for @init() and @free(), must be 1620 * implemented. 1621 * 1622 * @func: The trigger 'probe' function called when the triggering 1623 * event occurs. The data passed into this callback is the data 1624 * that was supplied to the event_command @reg() function that 1625 * registered the trigger (see struct event_command) along with 1626 * the trace record, rec. 1627 * 1628 * @init: An optional initialization function called for the trigger 1629 * when the trigger is registered (via the event_command reg() 1630 * function). This can be used to perform per-trigger 1631 * initialization such as incrementing a per-trigger reference 1632 * count, for instance. This is usually implemented by the 1633 * generic utility function @event_trigger_init() (see 1634 * trace_event_triggers.c). 1635 * 1636 * @free: An optional de-initialization function called for the 1637 * trigger when the trigger is unregistered (via the 1638 * event_command @reg() function). This can be used to perform 1639 * per-trigger de-initialization such as decrementing a 1640 * per-trigger reference count and freeing corresponding trigger 1641 * data, for instance. This is usually implemented by the 1642 * generic utility function @event_trigger_free() (see 1643 * trace_event_triggers.c). 1644 * 1645 * @print: The callback function invoked to have the trigger print 1646 * itself. This is usually implemented by a wrapper function 1647 * that calls the generic utility function @event_trigger_print() 1648 * (see trace_event_triggers.c). 1649 */ 1650 struct event_trigger_ops { 1651 void (*func)(struct event_trigger_data *data, 1652 struct trace_buffer *buffer, void *rec, 1653 struct ring_buffer_event *rbe); 1654 int (*init)(struct event_trigger_ops *ops, 1655 struct event_trigger_data *data); 1656 void (*free)(struct event_trigger_ops *ops, 1657 struct event_trigger_data *data); 1658 int (*print)(struct seq_file *m, 1659 struct event_trigger_ops *ops, 1660 struct event_trigger_data *data); 1661 }; 1662 1663 /** 1664 * struct event_command - callbacks and data members for event commands 1665 * 1666 * Event commands are invoked by users by writing the command name 1667 * into the 'trigger' file associated with a trace event. The 1668 * parameters associated with a specific invocation of an event 1669 * command are used to create an event trigger instance, which is 1670 * added to the list of trigger instances associated with that trace 1671 * event. When the event is hit, the set of triggers associated with 1672 * that event is invoked. 1673 * 1674 * The data members in this structure provide per-event command data 1675 * for various event commands. 1676 * 1677 * All the data members below, except for @post_trigger, must be set 1678 * for each event command. 1679 * 1680 * @name: The unique name that identifies the event command. This is 1681 * the name used when setting triggers via trigger files. 1682 * 1683 * @trigger_type: A unique id that identifies the event command 1684 * 'type'. This value has two purposes, the first to ensure that 1685 * only one trigger of the same type can be set at a given time 1686 * for a particular event e.g. it doesn't make sense to have both 1687 * a traceon and traceoff trigger attached to a single event at 1688 * the same time, so traceon and traceoff have the same type 1689 * though they have different names. The @trigger_type value is 1690 * also used as a bit value for deferring the actual trigger 1691 * action until after the current event is finished. Some 1692 * commands need to do this if they themselves log to the trace 1693 * buffer (see the @post_trigger() member below). @trigger_type 1694 * values are defined by adding new values to the trigger_type 1695 * enum in include/linux/trace_events.h. 1696 * 1697 * @flags: See the enum event_command_flags below. 1698 * 1699 * All the methods below, except for @set_filter() and @unreg_all(), 1700 * must be implemented. 1701 * 1702 * @func: The callback function responsible for parsing and 1703 * registering the trigger written to the 'trigger' file by the 1704 * user. It allocates the trigger instance and registers it with 1705 * the appropriate trace event. It makes use of the other 1706 * event_command callback functions to orchestrate this, and is 1707 * usually implemented by the generic utility function 1708 * @event_trigger_callback() (see trace_event_triggers.c). 1709 * 1710 * @reg: Adds the trigger to the list of triggers associated with the 1711 * event, and enables the event trigger itself, after 1712 * initializing it (via the event_trigger_ops @init() function). 1713 * This is also where commands can use the @trigger_type value to 1714 * make the decision as to whether or not multiple instances of 1715 * the trigger should be allowed. This is usually implemented by 1716 * the generic utility function @register_trigger() (see 1717 * trace_event_triggers.c). 1718 * 1719 * @unreg: Removes the trigger from the list of triggers associated 1720 * with the event, and disables the event trigger itself, after 1721 * initializing it (via the event_trigger_ops @free() function). 1722 * This is usually implemented by the generic utility function 1723 * @unregister_trigger() (see trace_event_triggers.c). 1724 * 1725 * @unreg_all: An optional function called to remove all the triggers 1726 * from the list of triggers associated with the event. Called 1727 * when a trigger file is opened in truncate mode. 1728 * 1729 * @set_filter: An optional function called to parse and set a filter 1730 * for the trigger. If no @set_filter() method is set for the 1731 * event command, filters set by the user for the command will be 1732 * ignored. This is usually implemented by the generic utility 1733 * function @set_trigger_filter() (see trace_event_triggers.c). 1734 * 1735 * @get_trigger_ops: The callback function invoked to retrieve the 1736 * event_trigger_ops implementation associated with the command. 1737 */ 1738 struct event_command { 1739 struct list_head list; 1740 char *name; 1741 enum event_trigger_type trigger_type; 1742 int flags; 1743 int (*func)(struct event_command *cmd_ops, 1744 struct trace_event_file *file, 1745 char *glob, char *cmd, char *params); 1746 int (*reg)(char *glob, 1747 struct event_trigger_ops *ops, 1748 struct event_trigger_data *data, 1749 struct trace_event_file *file); 1750 void (*unreg)(char *glob, 1751 struct event_trigger_ops *ops, 1752 struct event_trigger_data *data, 1753 struct trace_event_file *file); 1754 void (*unreg_all)(struct trace_event_file *file); 1755 int (*set_filter)(char *filter_str, 1756 struct event_trigger_data *data, 1757 struct trace_event_file *file); 1758 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1759 }; 1760 1761 /** 1762 * enum event_command_flags - flags for struct event_command 1763 * 1764 * @POST_TRIGGER: A flag that says whether or not this command needs 1765 * to have its action delayed until after the current event has 1766 * been closed. Some triggers need to avoid being invoked while 1767 * an event is currently in the process of being logged, since 1768 * the trigger may itself log data into the trace buffer. Thus 1769 * we make sure the current event is committed before invoking 1770 * those triggers. To do that, the trigger invocation is split 1771 * in two - the first part checks the filter using the current 1772 * trace record; if a command has the @post_trigger flag set, it 1773 * sets a bit for itself in the return value, otherwise it 1774 * directly invokes the trigger. Once all commands have been 1775 * either invoked or set their return flag, the current record is 1776 * either committed or discarded. At that point, if any commands 1777 * have deferred their triggers, those commands are finally 1778 * invoked following the close of the current event. In other 1779 * words, if the event_trigger_ops @func() probe implementation 1780 * itself logs to the trace buffer, this flag should be set, 1781 * otherwise it can be left unspecified. 1782 * 1783 * @NEEDS_REC: A flag that says whether or not this command needs 1784 * access to the trace record in order to perform its function, 1785 * regardless of whether or not it has a filter associated with 1786 * it (filters make a trigger require access to the trace record 1787 * but are not always present). 1788 */ 1789 enum event_command_flags { 1790 EVENT_CMD_FL_POST_TRIGGER = 1, 1791 EVENT_CMD_FL_NEEDS_REC = 2, 1792 }; 1793 1794 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1795 { 1796 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1797 } 1798 1799 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1800 { 1801 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1802 } 1803 1804 extern int trace_event_enable_disable(struct trace_event_file *file, 1805 int enable, int soft_disable); 1806 extern int tracing_alloc_snapshot(void); 1807 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1808 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1809 1810 extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1811 extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1812 1813 extern const char *__start___trace_bprintk_fmt[]; 1814 extern const char *__stop___trace_bprintk_fmt[]; 1815 1816 extern const char *__start___tracepoint_str[]; 1817 extern const char *__stop___tracepoint_str[]; 1818 1819 void trace_printk_control(bool enabled); 1820 void trace_printk_start_comm(void); 1821 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1822 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1823 1824 /* Used from boot time tracer */ 1825 extern int trace_set_options(struct trace_array *tr, char *option); 1826 extern int tracing_set_tracer(struct trace_array *tr, const char *buf); 1827 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr, 1828 unsigned long size, int cpu_id); 1829 extern int tracing_set_cpumask(struct trace_array *tr, 1830 cpumask_var_t tracing_cpumask_new); 1831 1832 1833 #define MAX_EVENT_NAME_LEN 64 1834 1835 extern ssize_t trace_parse_run_command(struct file *file, 1836 const char __user *buffer, size_t count, loff_t *ppos, 1837 int (*createfn)(const char *)); 1838 1839 extern unsigned int err_pos(char *cmd, const char *str); 1840 extern void tracing_log_err(struct trace_array *tr, 1841 const char *loc, const char *cmd, 1842 const char **errs, u8 type, u8 pos); 1843 1844 /* 1845 * Normal trace_printk() and friends allocates special buffers 1846 * to do the manipulation, as well as saves the print formats 1847 * into sections to display. But the trace infrastructure wants 1848 * to use these without the added overhead at the price of being 1849 * a bit slower (used mainly for warnings, where we don't care 1850 * about performance). The internal_trace_puts() is for such 1851 * a purpose. 1852 */ 1853 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1854 1855 #undef FTRACE_ENTRY 1856 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 1857 extern struct trace_event_call \ 1858 __aligned(4) event_##call; 1859 #undef FTRACE_ENTRY_DUP 1860 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 1861 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1862 #undef FTRACE_ENTRY_PACKED 1863 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \ 1864 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1865 1866 #include "trace_entries.h" 1867 1868 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1869 int perf_ftrace_event_register(struct trace_event_call *call, 1870 enum trace_reg type, void *data); 1871 #else 1872 #define perf_ftrace_event_register NULL 1873 #endif 1874 1875 #ifdef CONFIG_FTRACE_SYSCALLS 1876 void init_ftrace_syscalls(void); 1877 const char *get_syscall_name(int syscall); 1878 #else 1879 static inline void init_ftrace_syscalls(void) { } 1880 static inline const char *get_syscall_name(int syscall) 1881 { 1882 return NULL; 1883 } 1884 #endif 1885 1886 #ifdef CONFIG_EVENT_TRACING 1887 void trace_event_init(void); 1888 void trace_event_eval_update(struct trace_eval_map **map, int len); 1889 /* Used from boot time tracer */ 1890 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); 1891 extern int trigger_process_regex(struct trace_event_file *file, char *buff); 1892 #else 1893 static inline void __init trace_event_init(void) { } 1894 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1895 #endif 1896 1897 #ifdef CONFIG_TRACER_SNAPSHOT 1898 void tracing_snapshot_instance(struct trace_array *tr); 1899 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1900 #else 1901 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1902 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1903 { 1904 return 0; 1905 } 1906 #endif 1907 1908 #ifdef CONFIG_PREEMPT_TRACER 1909 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1910 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1911 #else 1912 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1913 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1914 #endif 1915 #ifdef CONFIG_IRQSOFF_TRACER 1916 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1917 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1918 #else 1919 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1920 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1921 #endif 1922 1923 extern struct trace_iterator *tracepoint_print_iter; 1924 1925 /* 1926 * Reset the state of the trace_iterator so that it can read consumed data. 1927 * Normally, the trace_iterator is used for reading the data when it is not 1928 * consumed, and must retain state. 1929 */ 1930 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 1931 { 1932 const size_t offset = offsetof(struct trace_iterator, seq); 1933 1934 /* 1935 * Keep gcc from complaining about overwriting more than just one 1936 * member in the structure. 1937 */ 1938 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset); 1939 1940 iter->pos = -1; 1941 } 1942 1943 /* Check the name is good for event/group/fields */ 1944 static inline bool is_good_name(const char *name) 1945 { 1946 if (!isalpha(*name) && *name != '_') 1947 return false; 1948 while (*++name != '\0') { 1949 if (!isalpha(*name) && !isdigit(*name) && *name != '_') 1950 return false; 1951 } 1952 return true; 1953 } 1954 1955 #endif /* _LINUX_KERNEL_TRACE_H */ 1956