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 #include <linux/once_lite.h> 24 25 #include "pid_list.h" 26 27 #ifdef CONFIG_FTRACE_SYSCALLS 28 #include <asm/unistd.h> /* For NR_SYSCALLS */ 29 #include <asm/syscall.h> /* some archs define it here */ 30 #endif 31 32 #define TRACE_MODE_WRITE 0640 33 #define TRACE_MODE_READ 0440 34 35 enum trace_type { 36 __TRACE_FIRST_TYPE = 0, 37 38 TRACE_FN, 39 TRACE_CTX, 40 TRACE_WAKE, 41 TRACE_STACK, 42 TRACE_PRINT, 43 TRACE_BPRINT, 44 TRACE_MMIO_RW, 45 TRACE_MMIO_MAP, 46 TRACE_BRANCH, 47 TRACE_GRAPH_RET, 48 TRACE_GRAPH_ENT, 49 TRACE_USER_STACK, 50 TRACE_BLK, 51 TRACE_BPUTS, 52 TRACE_HWLAT, 53 TRACE_OSNOISE, 54 TRACE_TIMERLAT, 55 TRACE_RAW_DATA, 56 TRACE_FUNC_REPEATS, 57 58 __TRACE_LAST_TYPE, 59 }; 60 61 62 #undef __field 63 #define __field(type, item) type item; 64 65 #undef __field_fn 66 #define __field_fn(type, item) type item; 67 68 #undef __field_struct 69 #define __field_struct(type, item) __field(type, item) 70 71 #undef __field_desc 72 #define __field_desc(type, container, item) 73 74 #undef __field_packed 75 #define __field_packed(type, container, item) 76 77 #undef __array 78 #define __array(type, item, size) type item[size]; 79 80 #undef __array_desc 81 #define __array_desc(type, container, item, size) 82 83 #undef __dynamic_array 84 #define __dynamic_array(type, item) type item[]; 85 86 #undef F_STRUCT 87 #define F_STRUCT(args...) args 88 89 #undef FTRACE_ENTRY 90 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 91 struct struct_name { \ 92 struct trace_entry ent; \ 93 tstruct \ 94 } 95 96 #undef FTRACE_ENTRY_DUP 97 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 98 99 #undef FTRACE_ENTRY_REG 100 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ 101 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 102 103 #undef FTRACE_ENTRY_PACKED 104 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ 105 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed 106 107 #include "trace_entries.h" 108 109 /* Use this for memory failure errors */ 110 #define MEM_FAIL(condition, fmt, ...) \ 111 DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__) 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 eprobe_trace_entry_head { 135 struct trace_entry ent; 136 unsigned int type; 137 }; 138 139 struct kretprobe_trace_entry_head { 140 struct trace_entry ent; 141 unsigned long func; 142 unsigned long ret_ip; 143 }; 144 145 #define TRACE_BUF_SIZE 1024 146 147 struct trace_array; 148 149 /* 150 * The CPU trace array - it consists of thousands of trace entries 151 * plus some other descriptor data: (for example which task started 152 * the trace, etc.) 153 */ 154 struct trace_array_cpu { 155 atomic_t disabled; 156 void *buffer_page; /* ring buffer spare */ 157 158 unsigned long entries; 159 unsigned long saved_latency; 160 unsigned long critical_start; 161 unsigned long critical_end; 162 unsigned long critical_sequence; 163 unsigned long nice; 164 unsigned long policy; 165 unsigned long rt_priority; 166 unsigned long skipped_entries; 167 u64 preempt_timestamp; 168 pid_t pid; 169 kuid_t uid; 170 char comm[TASK_COMM_LEN]; 171 172 #ifdef CONFIG_FUNCTION_TRACER 173 int ftrace_ignore_pid; 174 #endif 175 bool ignore_pid; 176 }; 177 178 struct tracer; 179 struct trace_option_dentry; 180 181 struct array_buffer { 182 struct trace_array *tr; 183 struct trace_buffer *buffer; 184 struct trace_array_cpu __percpu *data; 185 u64 time_start; 186 int cpu; 187 }; 188 189 #define TRACE_FLAGS_MAX_SIZE 32 190 191 struct trace_options { 192 struct tracer *tracer; 193 struct trace_option_dentry *topts; 194 }; 195 196 struct trace_pid_list *trace_pid_list_alloc(void); 197 void trace_pid_list_free(struct trace_pid_list *pid_list); 198 bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid); 199 int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid); 200 int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid); 201 int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid); 202 int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid, 203 unsigned int *next); 204 205 enum { 206 TRACE_PIDS = BIT(0), 207 TRACE_NO_PIDS = BIT(1), 208 }; 209 210 static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, 211 struct trace_pid_list *no_pid_list) 212 { 213 /* Return true if the pid list in type has pids */ 214 return ((type & TRACE_PIDS) && pid_list) || 215 ((type & TRACE_NO_PIDS) && no_pid_list); 216 } 217 218 static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, 219 struct trace_pid_list *no_pid_list) 220 { 221 /* 222 * Turning off what is in @type, return true if the "other" 223 * pid list, still has pids in it. 224 */ 225 return (!(type & TRACE_PIDS) && pid_list) || 226 (!(type & TRACE_NO_PIDS) && no_pid_list); 227 } 228 229 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 230 231 /** 232 * struct cond_snapshot - conditional snapshot data and callback 233 * 234 * The cond_snapshot structure encapsulates a callback function and 235 * data associated with the snapshot for a given tracing instance. 236 * 237 * When a snapshot is taken conditionally, by invoking 238 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 239 * passed in turn to the cond_snapshot.update() function. That data 240 * can be compared by the update() implementation with the cond_data 241 * contained within the struct cond_snapshot instance associated with 242 * the trace_array. Because the tr->max_lock is held throughout the 243 * update() call, the update() function can directly retrieve the 244 * cond_snapshot and cond_data associated with the per-instance 245 * snapshot associated with the trace_array. 246 * 247 * The cond_snapshot.update() implementation can save data to be 248 * associated with the snapshot if it decides to, and returns 'true' 249 * in that case, or it returns 'false' if the conditional snapshot 250 * shouldn't be taken. 251 * 252 * The cond_snapshot instance is created and associated with the 253 * user-defined cond_data by tracing_cond_snapshot_enable(). 254 * Likewise, the cond_snapshot instance is destroyed and is no longer 255 * associated with the trace instance by 256 * tracing_cond_snapshot_disable(). 257 * 258 * The method below is required. 259 * 260 * @update: When a conditional snapshot is invoked, the update() 261 * callback function is invoked with the tr->max_lock held. The 262 * update() implementation signals whether or not to actually 263 * take the snapshot, by returning 'true' if so, 'false' if no 264 * snapshot should be taken. Because the max_lock is held for 265 * the duration of update(), the implementation is safe to 266 * directly retrieved and save any implementation data it needs 267 * to in association with the snapshot. 268 */ 269 struct cond_snapshot { 270 void *cond_data; 271 cond_update_fn_t update; 272 }; 273 274 /* 275 * struct trace_func_repeats - used to keep track of the consecutive 276 * (on the same CPU) calls of a single function. 277 */ 278 struct trace_func_repeats { 279 unsigned long ip; 280 unsigned long parent_ip; 281 unsigned long count; 282 u64 ts_last_call; 283 }; 284 285 /* 286 * The trace array - an array of per-CPU trace arrays. This is the 287 * highest level data structure that individual tracers deal with. 288 * They have on/off state as well: 289 */ 290 struct trace_array { 291 struct list_head list; 292 char *name; 293 struct array_buffer array_buffer; 294 #ifdef CONFIG_TRACER_MAX_TRACE 295 /* 296 * The max_buffer is used to snapshot the trace when a maximum 297 * latency is reached, or when the user initiates a snapshot. 298 * Some tracers will use this to store a maximum trace while 299 * it continues examining live traces. 300 * 301 * The buffers for the max_buffer are set up the same as the array_buffer 302 * When a snapshot is taken, the buffer of the max_buffer is swapped 303 * with the buffer of the array_buffer and the buffers are reset for 304 * the array_buffer so the tracing can continue. 305 */ 306 struct array_buffer max_buffer; 307 bool allocated_snapshot; 308 #endif 309 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \ 310 || defined(CONFIG_OSNOISE_TRACER) 311 unsigned long max_latency; 312 #ifdef CONFIG_FSNOTIFY 313 struct dentry *d_max_latency; 314 struct work_struct fsnotify_work; 315 struct irq_work fsnotify_irqwork; 316 #endif 317 #endif 318 struct trace_pid_list __rcu *filtered_pids; 319 struct trace_pid_list __rcu *filtered_no_pids; 320 /* 321 * max_lock is used to protect the swapping of buffers 322 * when taking a max snapshot. The buffers themselves are 323 * protected by per_cpu spinlocks. But the action of the swap 324 * needs its own lock. 325 * 326 * This is defined as a arch_spinlock_t in order to help 327 * with performance when lockdep debugging is enabled. 328 * 329 * It is also used in other places outside the update_max_tr 330 * so it needs to be defined outside of the 331 * CONFIG_TRACER_MAX_TRACE. 332 */ 333 arch_spinlock_t max_lock; 334 int buffer_disabled; 335 #ifdef CONFIG_FTRACE_SYSCALLS 336 int sys_refcount_enter; 337 int sys_refcount_exit; 338 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 339 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 340 #endif 341 int stop_count; 342 int clock_id; 343 int nr_topts; 344 bool clear_trace; 345 int buffer_percent; 346 unsigned int n_err_log_entries; 347 struct tracer *current_trace; 348 unsigned int trace_flags; 349 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 350 unsigned int flags; 351 raw_spinlock_t start_lock; 352 struct list_head err_log; 353 struct dentry *dir; 354 struct dentry *options; 355 struct dentry *percpu_dir; 356 struct dentry *event_dir; 357 struct trace_options *topts; 358 struct list_head systems; 359 struct list_head events; 360 struct trace_event_file *trace_marker_file; 361 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 362 int ref; 363 int trace_ref; 364 #ifdef CONFIG_FUNCTION_TRACER 365 struct ftrace_ops *ops; 366 struct trace_pid_list __rcu *function_pids; 367 struct trace_pid_list __rcu *function_no_pids; 368 #ifdef CONFIG_DYNAMIC_FTRACE 369 /* All of these are protected by the ftrace_lock */ 370 struct list_head func_probes; 371 struct list_head mod_trace; 372 struct list_head mod_notrace; 373 #endif 374 /* function tracing enabled */ 375 int function_enabled; 376 #endif 377 int no_filter_buffering_ref; 378 struct list_head hist_vars; 379 #ifdef CONFIG_TRACER_SNAPSHOT 380 struct cond_snapshot *cond_snapshot; 381 #endif 382 struct trace_func_repeats __percpu *last_func_repeats; 383 }; 384 385 enum { 386 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 387 }; 388 389 extern struct list_head ftrace_trace_arrays; 390 391 extern struct mutex trace_types_lock; 392 393 extern int trace_array_get(struct trace_array *tr); 394 extern int tracing_check_open_get_tr(struct trace_array *tr); 395 extern struct trace_array *trace_array_find(const char *instance); 396 extern struct trace_array *trace_array_find_get(const char *instance); 397 398 extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe); 399 extern int tracing_set_filter_buffering(struct trace_array *tr, bool set); 400 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 401 402 extern bool trace_clock_in_ns(struct trace_array *tr); 403 404 /* 405 * The global tracer (top) should be the first trace array added, 406 * but we check the flag anyway. 407 */ 408 static inline struct trace_array *top_trace_array(void) 409 { 410 struct trace_array *tr; 411 412 if (list_empty(&ftrace_trace_arrays)) 413 return NULL; 414 415 tr = list_entry(ftrace_trace_arrays.prev, 416 typeof(*tr), list); 417 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 418 return tr; 419 } 420 421 #define FTRACE_CMP_TYPE(var, type) \ 422 __builtin_types_compatible_p(typeof(var), type *) 423 424 #undef IF_ASSIGN 425 #define IF_ASSIGN(var, entry, etype, id) \ 426 if (FTRACE_CMP_TYPE(var, etype)) { \ 427 var = (typeof(var))(entry); \ 428 WARN_ON(id != 0 && (entry)->type != id); \ 429 break; \ 430 } 431 432 /* Will cause compile errors if type is not found. */ 433 extern void __ftrace_bad_type(void); 434 435 /* 436 * The trace_assign_type is a verifier that the entry type is 437 * the same as the type being assigned. To add new types simply 438 * add a line with the following format: 439 * 440 * IF_ASSIGN(var, ent, type, id); 441 * 442 * Where "type" is the trace type that includes the trace_entry 443 * as the "ent" item. And "id" is the trace identifier that is 444 * used in the trace_type enum. 445 * 446 * If the type can have more than one id, then use zero. 447 */ 448 #define trace_assign_type(var, ent) \ 449 do { \ 450 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 451 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 452 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 453 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 454 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 455 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 456 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 457 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 458 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\ 459 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\ 460 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 461 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 462 TRACE_MMIO_RW); \ 463 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 464 TRACE_MMIO_MAP); \ 465 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 466 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 467 TRACE_GRAPH_ENT); \ 468 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 469 TRACE_GRAPH_RET); \ 470 IF_ASSIGN(var, ent, struct func_repeats_entry, \ 471 TRACE_FUNC_REPEATS); \ 472 __ftrace_bad_type(); \ 473 } while (0) 474 475 /* 476 * An option specific to a tracer. This is a boolean value. 477 * The bit is the bit index that sets its value on the 478 * flags value in struct tracer_flags. 479 */ 480 struct tracer_opt { 481 const char *name; /* Will appear on the trace_options file */ 482 u32 bit; /* Mask assigned in val field in tracer_flags */ 483 }; 484 485 /* 486 * The set of specific options for a tracer. Your tracer 487 * have to set the initial value of the flags val. 488 */ 489 struct tracer_flags { 490 u32 val; 491 struct tracer_opt *opts; 492 struct tracer *trace; 493 }; 494 495 /* Makes more easy to define a tracer opt */ 496 #define TRACER_OPT(s, b) .name = #s, .bit = b 497 498 499 struct trace_option_dentry { 500 struct tracer_opt *opt; 501 struct tracer_flags *flags; 502 struct trace_array *tr; 503 struct dentry *entry; 504 }; 505 506 /** 507 * struct tracer - a specific tracer and its callbacks to interact with tracefs 508 * @name: the name chosen to select it on the available_tracers file 509 * @init: called when one switches to this tracer (echo name > current_tracer) 510 * @reset: called when one switches to another tracer 511 * @start: called when tracing is unpaused (echo 1 > tracing_on) 512 * @stop: called when tracing is paused (echo 0 > tracing_on) 513 * @update_thresh: called when tracing_thresh is updated 514 * @open: called when the trace file is opened 515 * @pipe_open: called when the trace_pipe file is opened 516 * @close: called when the trace file is released 517 * @pipe_close: called when the trace_pipe file is released 518 * @read: override the default read callback on trace_pipe 519 * @splice_read: override the default splice_read callback on trace_pipe 520 * @selftest: selftest to run on boot (see trace_selftest.c) 521 * @print_headers: override the first lines that describe your columns 522 * @print_line: callback that prints a trace 523 * @set_flag: signals one of your private flags changed (trace_options file) 524 * @flags: your private flags 525 */ 526 struct tracer { 527 const char *name; 528 int (*init)(struct trace_array *tr); 529 void (*reset)(struct trace_array *tr); 530 void (*start)(struct trace_array *tr); 531 void (*stop)(struct trace_array *tr); 532 int (*update_thresh)(struct trace_array *tr); 533 void (*open)(struct trace_iterator *iter); 534 void (*pipe_open)(struct trace_iterator *iter); 535 void (*close)(struct trace_iterator *iter); 536 void (*pipe_close)(struct trace_iterator *iter); 537 ssize_t (*read)(struct trace_iterator *iter, 538 struct file *filp, char __user *ubuf, 539 size_t cnt, loff_t *ppos); 540 ssize_t (*splice_read)(struct trace_iterator *iter, 541 struct file *filp, 542 loff_t *ppos, 543 struct pipe_inode_info *pipe, 544 size_t len, 545 unsigned int flags); 546 #ifdef CONFIG_FTRACE_STARTUP_TEST 547 int (*selftest)(struct tracer *trace, 548 struct trace_array *tr); 549 #endif 550 void (*print_header)(struct seq_file *m); 551 enum print_line_t (*print_line)(struct trace_iterator *iter); 552 /* If you handled the flag setting, return 0 */ 553 int (*set_flag)(struct trace_array *tr, 554 u32 old_flags, u32 bit, int set); 555 /* Return 0 if OK with change, else return non-zero */ 556 int (*flag_changed)(struct trace_array *tr, 557 u32 mask, int set); 558 struct tracer *next; 559 struct tracer_flags *flags; 560 int enabled; 561 bool print_max; 562 bool allow_instances; 563 #ifdef CONFIG_TRACER_MAX_TRACE 564 bool use_max_tr; 565 #endif 566 /* True if tracer cannot be enabled in kernel param */ 567 bool noboot; 568 }; 569 570 static inline struct ring_buffer_iter * 571 trace_buffer_iter(struct trace_iterator *iter, int cpu) 572 { 573 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 574 } 575 576 int tracer_init(struct tracer *t, struct trace_array *tr); 577 int tracing_is_enabled(void); 578 void tracing_reset_online_cpus(struct array_buffer *buf); 579 void tracing_reset_current(int cpu); 580 void tracing_reset_all_online_cpus(void); 581 int tracing_open_generic(struct inode *inode, struct file *filp); 582 int tracing_open_generic_tr(struct inode *inode, struct file *filp); 583 bool tracing_is_disabled(void); 584 bool tracer_tracing_is_on(struct trace_array *tr); 585 void tracer_tracing_on(struct trace_array *tr); 586 void tracer_tracing_off(struct trace_array *tr); 587 struct dentry *trace_create_file(const char *name, 588 umode_t mode, 589 struct dentry *parent, 590 void *data, 591 const struct file_operations *fops); 592 593 int tracing_init_dentry(void); 594 595 struct ring_buffer_event; 596 597 struct ring_buffer_event * 598 trace_buffer_lock_reserve(struct trace_buffer *buffer, 599 int type, 600 unsigned long len, 601 unsigned int trace_ctx); 602 603 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 604 struct trace_array_cpu *data); 605 606 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 607 int *ent_cpu, u64 *ent_ts); 608 609 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, 610 struct ring_buffer_event *event); 611 612 bool trace_is_tracepoint_string(const char *str); 613 const char *trace_event_format(struct trace_iterator *iter, const char *fmt); 614 void trace_check_vprintf(struct trace_iterator *iter, const char *fmt, 615 va_list ap); 616 617 int trace_empty(struct trace_iterator *iter); 618 619 void *trace_find_next_entry_inc(struct trace_iterator *iter); 620 621 void trace_init_global_iter(struct trace_iterator *iter); 622 623 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 624 625 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 626 unsigned long trace_total_entries(struct trace_array *tr); 627 628 void trace_function(struct trace_array *tr, 629 unsigned long ip, 630 unsigned long parent_ip, 631 unsigned int trace_ctx); 632 void trace_graph_function(struct trace_array *tr, 633 unsigned long ip, 634 unsigned long parent_ip, 635 unsigned int trace_ctx); 636 void trace_latency_header(struct seq_file *m); 637 void trace_default_header(struct seq_file *m); 638 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 639 640 void trace_graph_return(struct ftrace_graph_ret *trace); 641 int trace_graph_entry(struct ftrace_graph_ent *trace); 642 void set_graph_array(struct trace_array *tr); 643 644 void tracing_start_cmdline_record(void); 645 void tracing_stop_cmdline_record(void); 646 void tracing_start_tgid_record(void); 647 void tracing_stop_tgid_record(void); 648 649 int register_tracer(struct tracer *type); 650 int is_tracing_stopped(void); 651 652 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 653 654 extern cpumask_var_t __read_mostly tracing_buffer_mask; 655 656 #define for_each_tracing_cpu(cpu) \ 657 for_each_cpu(cpu, tracing_buffer_mask) 658 659 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 660 661 extern unsigned long tracing_thresh; 662 663 /* PID filtering */ 664 665 extern int pid_max; 666 667 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 668 pid_t search_pid); 669 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 670 struct trace_pid_list *filtered_no_pids, 671 struct task_struct *task); 672 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 673 struct task_struct *self, 674 struct task_struct *task); 675 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 676 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 677 int trace_pid_show(struct seq_file *m, void *v); 678 void trace_free_pid_list(struct trace_pid_list *pid_list); 679 int trace_pid_write(struct trace_pid_list *filtered_pids, 680 struct trace_pid_list **new_pid_list, 681 const char __user *ubuf, size_t cnt); 682 683 #ifdef CONFIG_TRACER_MAX_TRACE 684 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 685 void *cond_data); 686 void update_max_tr_single(struct trace_array *tr, 687 struct task_struct *tsk, int cpu); 688 #endif /* CONFIG_TRACER_MAX_TRACE */ 689 690 #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \ 691 || defined(CONFIG_OSNOISE_TRACER)) && defined(CONFIG_FSNOTIFY) 692 #define LATENCY_FS_NOTIFY 693 #endif 694 695 #ifdef LATENCY_FS_NOTIFY 696 void latency_fsnotify(struct trace_array *tr); 697 #else 698 static inline void latency_fsnotify(struct trace_array *tr) { } 699 #endif 700 701 #ifdef CONFIG_STACKTRACE 702 void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip); 703 #else 704 static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, 705 int skip) 706 { 707 } 708 #endif /* CONFIG_STACKTRACE */ 709 710 void trace_last_func_repeats(struct trace_array *tr, 711 struct trace_func_repeats *last_info, 712 unsigned int trace_ctx); 713 714 extern u64 ftrace_now(int cpu); 715 716 extern void trace_find_cmdline(int pid, char comm[]); 717 extern int trace_find_tgid(int pid); 718 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 719 720 #ifdef CONFIG_DYNAMIC_FTRACE 721 extern unsigned long ftrace_update_tot_cnt; 722 extern unsigned long ftrace_number_of_pages; 723 extern unsigned long ftrace_number_of_groups; 724 void ftrace_init_trace_array(struct trace_array *tr); 725 #else 726 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 727 #endif 728 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 729 extern int DYN_FTRACE_TEST_NAME(void); 730 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 731 extern int DYN_FTRACE_TEST_NAME2(void); 732 733 extern bool ring_buffer_expanded; 734 extern bool tracing_selftest_disabled; 735 736 #ifdef CONFIG_FTRACE_STARTUP_TEST 737 extern void __init disable_tracing_selftest(const char *reason); 738 739 extern int trace_selftest_startup_function(struct tracer *trace, 740 struct trace_array *tr); 741 extern int trace_selftest_startup_function_graph(struct tracer *trace, 742 struct trace_array *tr); 743 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 744 struct trace_array *tr); 745 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 746 struct trace_array *tr); 747 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 748 struct trace_array *tr); 749 extern int trace_selftest_startup_wakeup(struct tracer *trace, 750 struct trace_array *tr); 751 extern int trace_selftest_startup_nop(struct tracer *trace, 752 struct trace_array *tr); 753 extern int trace_selftest_startup_branch(struct tracer *trace, 754 struct trace_array *tr); 755 /* 756 * Tracer data references selftest functions that only occur 757 * on boot up. These can be __init functions. Thus, when selftests 758 * are enabled, then the tracers need to reference __init functions. 759 */ 760 #define __tracer_data __refdata 761 #else 762 static inline void __init disable_tracing_selftest(const char *reason) 763 { 764 } 765 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 766 #define __tracer_data __read_mostly 767 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 768 769 extern void *head_page(struct trace_array_cpu *data); 770 extern unsigned long long ns2usecs(u64 nsec); 771 extern int 772 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 773 extern int 774 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 775 extern int 776 trace_array_vprintk(struct trace_array *tr, 777 unsigned long ip, const char *fmt, va_list args); 778 int trace_array_printk_buf(struct trace_buffer *buffer, 779 unsigned long ip, const char *fmt, ...); 780 void trace_printk_seq(struct trace_seq *s); 781 enum print_line_t print_trace_line(struct trace_iterator *iter); 782 783 extern char trace_find_mark(unsigned long long duration); 784 785 struct ftrace_hash; 786 787 struct ftrace_mod_load { 788 struct list_head list; 789 char *func; 790 char *module; 791 int enable; 792 }; 793 794 enum { 795 FTRACE_HASH_FL_MOD = (1 << 0), 796 }; 797 798 struct ftrace_hash { 799 unsigned long size_bits; 800 struct hlist_head *buckets; 801 unsigned long count; 802 unsigned long flags; 803 struct rcu_head rcu; 804 }; 805 806 struct ftrace_func_entry * 807 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 808 809 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 810 { 811 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 812 } 813 814 /* Standard output formatting function used for function return traces */ 815 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 816 817 /* Flag options */ 818 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 819 #define TRACE_GRAPH_PRINT_CPU 0x2 820 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 821 #define TRACE_GRAPH_PRINT_PROC 0x8 822 #define TRACE_GRAPH_PRINT_DURATION 0x10 823 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 824 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 825 #define TRACE_GRAPH_PRINT_IRQS 0x80 826 #define TRACE_GRAPH_PRINT_TAIL 0x100 827 #define TRACE_GRAPH_SLEEP_TIME 0x200 828 #define TRACE_GRAPH_GRAPH_TIME 0x400 829 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 830 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 831 832 extern void ftrace_graph_sleep_time_control(bool enable); 833 834 #ifdef CONFIG_FUNCTION_PROFILER 835 extern void ftrace_graph_graph_time_control(bool enable); 836 #else 837 static inline void ftrace_graph_graph_time_control(bool enable) { } 838 #endif 839 840 extern enum print_line_t 841 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 842 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 843 extern void 844 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 845 extern void graph_trace_open(struct trace_iterator *iter); 846 extern void graph_trace_close(struct trace_iterator *iter); 847 extern int __trace_graph_entry(struct trace_array *tr, 848 struct ftrace_graph_ent *trace, 849 unsigned int trace_ctx); 850 extern void __trace_graph_return(struct trace_array *tr, 851 struct ftrace_graph_ret *trace, 852 unsigned int trace_ctx); 853 854 #ifdef CONFIG_DYNAMIC_FTRACE 855 extern struct ftrace_hash __rcu *ftrace_graph_hash; 856 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; 857 858 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 859 { 860 unsigned long addr = trace->func; 861 int ret = 0; 862 struct ftrace_hash *hash; 863 864 preempt_disable_notrace(); 865 866 /* 867 * Have to open code "rcu_dereference_sched()" because the 868 * function graph tracer can be called when RCU is not 869 * "watching". 870 * Protected with schedule_on_each_cpu(ftrace_sync) 871 */ 872 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); 873 874 if (ftrace_hash_empty(hash)) { 875 ret = 1; 876 goto out; 877 } 878 879 if (ftrace_lookup_ip(hash, addr)) { 880 881 /* 882 * This needs to be cleared on the return functions 883 * when the depth is zero. 884 */ 885 trace_recursion_set(TRACE_GRAPH_BIT); 886 trace_recursion_set_depth(trace->depth); 887 888 /* 889 * If no irqs are to be traced, but a set_graph_function 890 * is set, and called by an interrupt handler, we still 891 * want to trace it. 892 */ 893 if (in_hardirq()) 894 trace_recursion_set(TRACE_IRQ_BIT); 895 else 896 trace_recursion_clear(TRACE_IRQ_BIT); 897 ret = 1; 898 } 899 900 out: 901 preempt_enable_notrace(); 902 return ret; 903 } 904 905 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 906 { 907 if (trace_recursion_test(TRACE_GRAPH_BIT) && 908 trace->depth == trace_recursion_depth()) 909 trace_recursion_clear(TRACE_GRAPH_BIT); 910 } 911 912 static inline int ftrace_graph_notrace_addr(unsigned long addr) 913 { 914 int ret = 0; 915 struct ftrace_hash *notrace_hash; 916 917 preempt_disable_notrace(); 918 919 /* 920 * Have to open code "rcu_dereference_sched()" because the 921 * function graph tracer can be called when RCU is not 922 * "watching". 923 * Protected with schedule_on_each_cpu(ftrace_sync) 924 */ 925 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, 926 !preemptible()); 927 928 if (ftrace_lookup_ip(notrace_hash, addr)) 929 ret = 1; 930 931 preempt_enable_notrace(); 932 return ret; 933 } 934 #else 935 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 936 { 937 return 1; 938 } 939 940 static inline int ftrace_graph_notrace_addr(unsigned long addr) 941 { 942 return 0; 943 } 944 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 945 { } 946 #endif /* CONFIG_DYNAMIC_FTRACE */ 947 948 extern unsigned int fgraph_max_depth; 949 950 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 951 { 952 /* trace it when it is-nested-in or is a function enabled. */ 953 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 954 ftrace_graph_addr(trace)) || 955 (trace->depth < 0) || 956 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 957 } 958 959 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 960 static inline enum print_line_t 961 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 962 { 963 return TRACE_TYPE_UNHANDLED; 964 } 965 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 966 967 extern struct list_head ftrace_pids; 968 969 #ifdef CONFIG_FUNCTION_TRACER 970 971 #define FTRACE_PID_IGNORE -1 972 #define FTRACE_PID_TRACE -2 973 974 struct ftrace_func_command { 975 struct list_head list; 976 char *name; 977 int (*func)(struct trace_array *tr, 978 struct ftrace_hash *hash, 979 char *func, char *cmd, 980 char *params, int enable); 981 }; 982 extern bool ftrace_filter_param __initdata; 983 static inline int ftrace_trace_task(struct trace_array *tr) 984 { 985 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) != 986 FTRACE_PID_IGNORE; 987 } 988 extern int ftrace_is_dead(void); 989 int ftrace_create_function_files(struct trace_array *tr, 990 struct dentry *parent); 991 void ftrace_destroy_function_files(struct trace_array *tr); 992 int ftrace_allocate_ftrace_ops(struct trace_array *tr); 993 void ftrace_free_ftrace_ops(struct trace_array *tr); 994 void ftrace_init_global_array_ops(struct trace_array *tr); 995 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 996 void ftrace_reset_array_ops(struct trace_array *tr); 997 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 998 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 999 struct dentry *d_tracer); 1000 void ftrace_clear_pids(struct trace_array *tr); 1001 int init_function_trace(void); 1002 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1003 #else 1004 static inline int ftrace_trace_task(struct trace_array *tr) 1005 { 1006 return 1; 1007 } 1008 static inline int ftrace_is_dead(void) { return 0; } 1009 static inline int 1010 ftrace_create_function_files(struct trace_array *tr, 1011 struct dentry *parent) 1012 { 1013 return 0; 1014 } 1015 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) 1016 { 1017 return 0; 1018 } 1019 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } 1020 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1021 static inline __init void 1022 ftrace_init_global_array_ops(struct trace_array *tr) { } 1023 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1024 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1025 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1026 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1027 static inline int init_function_trace(void) { return 0; } 1028 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1029 /* ftace_func_t type is not defined, use macro instead of static inline */ 1030 #define ftrace_init_array_ops(tr, func) do { } while (0) 1031 #endif /* CONFIG_FUNCTION_TRACER */ 1032 1033 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1034 1035 struct ftrace_probe_ops { 1036 void (*func)(unsigned long ip, 1037 unsigned long parent_ip, 1038 struct trace_array *tr, 1039 struct ftrace_probe_ops *ops, 1040 void *data); 1041 int (*init)(struct ftrace_probe_ops *ops, 1042 struct trace_array *tr, 1043 unsigned long ip, void *init_data, 1044 void **data); 1045 void (*free)(struct ftrace_probe_ops *ops, 1046 struct trace_array *tr, 1047 unsigned long ip, void *data); 1048 int (*print)(struct seq_file *m, 1049 unsigned long ip, 1050 struct ftrace_probe_ops *ops, 1051 void *data); 1052 }; 1053 1054 struct ftrace_func_mapper; 1055 typedef int (*ftrace_mapper_func)(void *data); 1056 1057 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1058 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1059 unsigned long ip); 1060 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1061 unsigned long ip, void *data); 1062 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1063 unsigned long ip); 1064 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1065 ftrace_mapper_func free_func); 1066 1067 extern int 1068 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1069 struct ftrace_probe_ops *ops, void *data); 1070 extern int 1071 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1072 struct ftrace_probe_ops *ops); 1073 extern void clear_ftrace_function_probes(struct trace_array *tr); 1074 1075 int register_ftrace_command(struct ftrace_func_command *cmd); 1076 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1077 1078 void ftrace_create_filter_files(struct ftrace_ops *ops, 1079 struct dentry *parent); 1080 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1081 1082 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, 1083 int len, int reset); 1084 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, 1085 int len, int reset); 1086 #else 1087 struct ftrace_func_command; 1088 1089 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1090 { 1091 return -EINVAL; 1092 } 1093 static inline __init int unregister_ftrace_command(char *cmd_name) 1094 { 1095 return -EINVAL; 1096 } 1097 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1098 { 1099 } 1100 1101 /* 1102 * The ops parameter passed in is usually undefined. 1103 * This must be a macro. 1104 */ 1105 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1106 #define ftrace_destroy_filter_files(ops) do { } while (0) 1107 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1108 1109 bool ftrace_event_is_function(struct trace_event_call *call); 1110 1111 /* 1112 * struct trace_parser - servers for reading the user input separated by spaces 1113 * @cont: set if the input is not complete - no final space char was found 1114 * @buffer: holds the parsed user input 1115 * @idx: user input length 1116 * @size: buffer size 1117 */ 1118 struct trace_parser { 1119 bool cont; 1120 char *buffer; 1121 unsigned idx; 1122 unsigned size; 1123 }; 1124 1125 static inline bool trace_parser_loaded(struct trace_parser *parser) 1126 { 1127 return (parser->idx != 0); 1128 } 1129 1130 static inline bool trace_parser_cont(struct trace_parser *parser) 1131 { 1132 return parser->cont; 1133 } 1134 1135 static inline void trace_parser_clear(struct trace_parser *parser) 1136 { 1137 parser->cont = false; 1138 parser->idx = 0; 1139 } 1140 1141 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1142 extern void trace_parser_put(struct trace_parser *parser); 1143 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1144 size_t cnt, loff_t *ppos); 1145 1146 /* 1147 * Only create function graph options if function graph is configured. 1148 */ 1149 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1150 # define FGRAPH_FLAGS \ 1151 C(DISPLAY_GRAPH, "display-graph"), 1152 #else 1153 # define FGRAPH_FLAGS 1154 #endif 1155 1156 #ifdef CONFIG_BRANCH_TRACER 1157 # define BRANCH_FLAGS \ 1158 C(BRANCH, "branch"), 1159 #else 1160 # define BRANCH_FLAGS 1161 #endif 1162 1163 #ifdef CONFIG_FUNCTION_TRACER 1164 # define FUNCTION_FLAGS \ 1165 C(FUNCTION, "function-trace"), \ 1166 C(FUNC_FORK, "function-fork"), 1167 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1168 #else 1169 # define FUNCTION_FLAGS 1170 # define FUNCTION_DEFAULT_FLAGS 0UL 1171 # define TRACE_ITER_FUNC_FORK 0UL 1172 #endif 1173 1174 #ifdef CONFIG_STACKTRACE 1175 # define STACK_FLAGS \ 1176 C(STACKTRACE, "stacktrace"), 1177 #else 1178 # define STACK_FLAGS 1179 #endif 1180 1181 /* 1182 * trace_iterator_flags is an enumeration that defines bit 1183 * positions into trace_flags that controls the output. 1184 * 1185 * NOTE: These bits must match the trace_options array in 1186 * trace.c (this macro guarantees it). 1187 */ 1188 #define TRACE_FLAGS \ 1189 C(PRINT_PARENT, "print-parent"), \ 1190 C(SYM_OFFSET, "sym-offset"), \ 1191 C(SYM_ADDR, "sym-addr"), \ 1192 C(VERBOSE, "verbose"), \ 1193 C(RAW, "raw"), \ 1194 C(HEX, "hex"), \ 1195 C(BIN, "bin"), \ 1196 C(BLOCK, "block"), \ 1197 C(PRINTK, "trace_printk"), \ 1198 C(ANNOTATE, "annotate"), \ 1199 C(USERSTACKTRACE, "userstacktrace"), \ 1200 C(SYM_USEROBJ, "sym-userobj"), \ 1201 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1202 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1203 C(LATENCY_FMT, "latency-format"), \ 1204 C(RECORD_CMD, "record-cmd"), \ 1205 C(RECORD_TGID, "record-tgid"), \ 1206 C(OVERWRITE, "overwrite"), \ 1207 C(STOP_ON_FREE, "disable_on_free"), \ 1208 C(IRQ_INFO, "irq-info"), \ 1209 C(MARKERS, "markers"), \ 1210 C(EVENT_FORK, "event-fork"), \ 1211 C(PAUSE_ON_TRACE, "pause-on-trace"), \ 1212 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \ 1213 FUNCTION_FLAGS \ 1214 FGRAPH_FLAGS \ 1215 STACK_FLAGS \ 1216 BRANCH_FLAGS 1217 1218 /* 1219 * By defining C, we can make TRACE_FLAGS a list of bit names 1220 * that will define the bits for the flag masks. 1221 */ 1222 #undef C 1223 #define C(a, b) TRACE_ITER_##a##_BIT 1224 1225 enum trace_iterator_bits { 1226 TRACE_FLAGS 1227 /* Make sure we don't go more than we have bits for */ 1228 TRACE_ITER_LAST_BIT 1229 }; 1230 1231 /* 1232 * By redefining C, we can make TRACE_FLAGS a list of masks that 1233 * use the bits as defined above. 1234 */ 1235 #undef C 1236 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1237 1238 enum trace_iterator_flags { TRACE_FLAGS }; 1239 1240 /* 1241 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1242 * control the output of kernel symbols. 1243 */ 1244 #define TRACE_ITER_SYM_MASK \ 1245 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1246 1247 extern struct tracer nop_trace; 1248 1249 #ifdef CONFIG_BRANCH_TRACER 1250 extern int enable_branch_tracing(struct trace_array *tr); 1251 extern void disable_branch_tracing(void); 1252 static inline int trace_branch_enable(struct trace_array *tr) 1253 { 1254 if (tr->trace_flags & TRACE_ITER_BRANCH) 1255 return enable_branch_tracing(tr); 1256 return 0; 1257 } 1258 static inline void trace_branch_disable(void) 1259 { 1260 /* due to races, always disable */ 1261 disable_branch_tracing(); 1262 } 1263 #else 1264 static inline int trace_branch_enable(struct trace_array *tr) 1265 { 1266 return 0; 1267 } 1268 static inline void trace_branch_disable(void) 1269 { 1270 } 1271 #endif /* CONFIG_BRANCH_TRACER */ 1272 1273 /* set ring buffers to default size if not already done so */ 1274 int tracing_update_buffers(void); 1275 1276 struct ftrace_event_field { 1277 struct list_head link; 1278 const char *name; 1279 const char *type; 1280 int filter_type; 1281 int offset; 1282 int size; 1283 int is_signed; 1284 }; 1285 1286 struct prog_entry; 1287 1288 struct event_filter { 1289 struct prog_entry __rcu *prog; 1290 char *filter_string; 1291 }; 1292 1293 struct event_subsystem { 1294 struct list_head list; 1295 const char *name; 1296 struct event_filter *filter; 1297 int ref_count; 1298 }; 1299 1300 struct trace_subsystem_dir { 1301 struct list_head list; 1302 struct event_subsystem *subsystem; 1303 struct trace_array *tr; 1304 struct dentry *entry; 1305 int ref_count; 1306 int nr_events; 1307 }; 1308 1309 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1310 struct trace_buffer *buffer, 1311 struct ring_buffer_event *event); 1312 1313 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1314 struct trace_buffer *buffer, 1315 struct ring_buffer_event *event, 1316 unsigned int trcace_ctx, 1317 struct pt_regs *regs); 1318 1319 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1320 struct trace_buffer *buffer, 1321 struct ring_buffer_event *event, 1322 unsigned int trace_ctx) 1323 { 1324 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL); 1325 } 1326 1327 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1328 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1329 void trace_buffered_event_disable(void); 1330 void trace_buffered_event_enable(void); 1331 1332 static inline void 1333 __trace_event_discard_commit(struct trace_buffer *buffer, 1334 struct ring_buffer_event *event) 1335 { 1336 if (this_cpu_read(trace_buffered_event) == event) { 1337 /* Simply release the temp buffer */ 1338 this_cpu_dec(trace_buffered_event_cnt); 1339 return; 1340 } 1341 ring_buffer_discard_commit(buffer, event); 1342 } 1343 1344 /* 1345 * Helper function for event_trigger_unlock_commit{_regs}(). 1346 * If there are event triggers attached to this event that requires 1347 * filtering against its fields, then they will be called as the 1348 * entry already holds the field information of the current event. 1349 * 1350 * It also checks if the event should be discarded or not. 1351 * It is to be discarded if the event is soft disabled and the 1352 * event was only recorded to process triggers, or if the event 1353 * filter is active and this event did not match the filters. 1354 * 1355 * Returns true if the event is discarded, false otherwise. 1356 */ 1357 static inline bool 1358 __event_trigger_test_discard(struct trace_event_file *file, 1359 struct trace_buffer *buffer, 1360 struct ring_buffer_event *event, 1361 void *entry, 1362 enum event_trigger_type *tt) 1363 { 1364 unsigned long eflags = file->flags; 1365 1366 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1367 *tt = event_triggers_call(file, buffer, entry, event); 1368 1369 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || 1370 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && 1371 !filter_match_preds(file->filter, entry))) { 1372 __trace_event_discard_commit(buffer, event); 1373 return true; 1374 } 1375 1376 return false; 1377 } 1378 1379 /** 1380 * event_trigger_unlock_commit - handle triggers and finish event commit 1381 * @file: The file pointer associated with the event 1382 * @buffer: The ring buffer that the event is being written to 1383 * @event: The event meta data in the ring buffer 1384 * @entry: The event itself 1385 * @trace_ctx: The tracing context flags. 1386 * 1387 * This is a helper function to handle triggers that require data 1388 * from the event itself. It also tests the event against filters and 1389 * if the event is soft disabled and should be discarded. 1390 */ 1391 static inline void 1392 event_trigger_unlock_commit(struct trace_event_file *file, 1393 struct trace_buffer *buffer, 1394 struct ring_buffer_event *event, 1395 void *entry, unsigned int trace_ctx) 1396 { 1397 enum event_trigger_type tt = ETT_NONE; 1398 1399 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1400 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx); 1401 1402 if (tt) 1403 event_triggers_post_call(file, tt); 1404 } 1405 1406 #define FILTER_PRED_INVALID ((unsigned short)-1) 1407 #define FILTER_PRED_IS_RIGHT (1 << 15) 1408 #define FILTER_PRED_FOLD (1 << 15) 1409 1410 /* 1411 * The max preds is the size of unsigned short with 1412 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1413 * and FOLD flags. The other is reserved. 1414 * 1415 * 2^14 preds is way more than enough. 1416 */ 1417 #define MAX_FILTER_PRED 16384 1418 1419 struct filter_pred; 1420 struct regex; 1421 1422 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1423 1424 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1425 1426 enum regex_type { 1427 MATCH_FULL = 0, 1428 MATCH_FRONT_ONLY, 1429 MATCH_MIDDLE_ONLY, 1430 MATCH_END_ONLY, 1431 MATCH_GLOB, 1432 MATCH_INDEX, 1433 }; 1434 1435 struct regex { 1436 char pattern[MAX_FILTER_STR_VAL]; 1437 int len; 1438 int field_len; 1439 regex_match_func match; 1440 }; 1441 1442 struct filter_pred { 1443 filter_pred_fn_t fn; 1444 u64 val; 1445 struct regex regex; 1446 unsigned short *ops; 1447 struct ftrace_event_field *field; 1448 int offset; 1449 int not; 1450 int op; 1451 }; 1452 1453 static inline bool is_string_field(struct ftrace_event_field *field) 1454 { 1455 return field->filter_type == FILTER_DYN_STRING || 1456 field->filter_type == FILTER_STATIC_STRING || 1457 field->filter_type == FILTER_PTR_STRING || 1458 field->filter_type == FILTER_COMM; 1459 } 1460 1461 static inline bool is_function_field(struct ftrace_event_field *field) 1462 { 1463 return field->filter_type == FILTER_TRACE_FN; 1464 } 1465 1466 extern enum regex_type 1467 filter_parse_regex(char *buff, int len, char **search, int *not); 1468 extern void print_event_filter(struct trace_event_file *file, 1469 struct trace_seq *s); 1470 extern int apply_event_filter(struct trace_event_file *file, 1471 char *filter_string); 1472 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1473 char *filter_string); 1474 extern void print_subsystem_event_filter(struct event_subsystem *system, 1475 struct trace_seq *s); 1476 extern int filter_assign_type(const char *type); 1477 extern int create_event_filter(struct trace_array *tr, 1478 struct trace_event_call *call, 1479 char *filter_str, bool set_str, 1480 struct event_filter **filterp); 1481 extern void free_event_filter(struct event_filter *filter); 1482 1483 struct ftrace_event_field * 1484 trace_find_event_field(struct trace_event_call *call, char *name); 1485 1486 extern void trace_event_enable_cmd_record(bool enable); 1487 extern void trace_event_enable_tgid_record(bool enable); 1488 1489 extern int event_trace_init(void); 1490 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1491 extern int event_trace_del_tracer(struct trace_array *tr); 1492 extern void __trace_early_add_events(struct trace_array *tr); 1493 1494 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1495 const char *system, 1496 const char *event); 1497 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1498 const char *system, 1499 const char *event); 1500 1501 static inline void *event_file_data(struct file *filp) 1502 { 1503 return READ_ONCE(file_inode(filp)->i_private); 1504 } 1505 1506 extern struct mutex event_mutex; 1507 extern struct list_head ftrace_events; 1508 1509 extern const struct file_operations event_trigger_fops; 1510 extern const struct file_operations event_hist_fops; 1511 extern const struct file_operations event_hist_debug_fops; 1512 extern const struct file_operations event_inject_fops; 1513 1514 #ifdef CONFIG_HIST_TRIGGERS 1515 extern int register_trigger_hist_cmd(void); 1516 extern int register_trigger_hist_enable_disable_cmds(void); 1517 #else 1518 static inline int register_trigger_hist_cmd(void) { return 0; } 1519 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1520 #endif 1521 1522 extern int register_trigger_cmds(void); 1523 extern void clear_event_triggers(struct trace_array *tr); 1524 1525 enum { 1526 EVENT_TRIGGER_FL_PROBE = BIT(0), 1527 }; 1528 1529 struct event_trigger_data { 1530 unsigned long count; 1531 int ref; 1532 int flags; 1533 struct event_trigger_ops *ops; 1534 struct event_command *cmd_ops; 1535 struct event_filter __rcu *filter; 1536 char *filter_str; 1537 void *private_data; 1538 bool paused; 1539 bool paused_tmp; 1540 struct list_head list; 1541 char *name; 1542 struct list_head named_list; 1543 struct event_trigger_data *named_data; 1544 }; 1545 1546 /* Avoid typos */ 1547 #define ENABLE_EVENT_STR "enable_event" 1548 #define DISABLE_EVENT_STR "disable_event" 1549 #define ENABLE_HIST_STR "enable_hist" 1550 #define DISABLE_HIST_STR "disable_hist" 1551 1552 struct enable_trigger_data { 1553 struct trace_event_file *file; 1554 bool enable; 1555 bool hist; 1556 }; 1557 1558 extern int event_enable_trigger_print(struct seq_file *m, 1559 struct event_trigger_ops *ops, 1560 struct event_trigger_data *data); 1561 extern void event_enable_trigger_free(struct event_trigger_ops *ops, 1562 struct event_trigger_data *data); 1563 extern int event_enable_trigger_func(struct event_command *cmd_ops, 1564 struct trace_event_file *file, 1565 char *glob, char *cmd, char *param); 1566 extern int event_enable_register_trigger(char *glob, 1567 struct event_trigger_ops *ops, 1568 struct event_trigger_data *data, 1569 struct trace_event_file *file); 1570 extern void event_enable_unregister_trigger(char *glob, 1571 struct event_trigger_ops *ops, 1572 struct event_trigger_data *test, 1573 struct trace_event_file *file); 1574 extern void trigger_data_free(struct event_trigger_data *data); 1575 extern int event_trigger_init(struct event_trigger_ops *ops, 1576 struct event_trigger_data *data); 1577 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1578 int trigger_enable); 1579 extern void update_cond_flag(struct trace_event_file *file); 1580 extern int set_trigger_filter(char *filter_str, 1581 struct event_trigger_data *trigger_data, 1582 struct trace_event_file *file); 1583 extern struct event_trigger_data *find_named_trigger(const char *name); 1584 extern bool is_named_trigger(struct event_trigger_data *test); 1585 extern int save_named_trigger(const char *name, 1586 struct event_trigger_data *data); 1587 extern void del_named_trigger(struct event_trigger_data *data); 1588 extern void pause_named_trigger(struct event_trigger_data *data); 1589 extern void unpause_named_trigger(struct event_trigger_data *data); 1590 extern void set_named_trigger_data(struct event_trigger_data *data, 1591 struct event_trigger_data *named_data); 1592 extern struct event_trigger_data * 1593 get_named_trigger_data(struct event_trigger_data *data); 1594 extern int register_event_command(struct event_command *cmd); 1595 extern int unregister_event_command(struct event_command *cmd); 1596 extern int register_trigger_hist_enable_disable_cmds(void); 1597 1598 /** 1599 * struct event_trigger_ops - callbacks for trace event triggers 1600 * 1601 * The methods in this structure provide per-event trigger hooks for 1602 * various trigger operations. 1603 * 1604 * All the methods below, except for @init() and @free(), must be 1605 * implemented. 1606 * 1607 * @func: The trigger 'probe' function called when the triggering 1608 * event occurs. The data passed into this callback is the data 1609 * that was supplied to the event_command @reg() function that 1610 * registered the trigger (see struct event_command) along with 1611 * the trace record, rec. 1612 * 1613 * @init: An optional initialization function called for the trigger 1614 * when the trigger is registered (via the event_command reg() 1615 * function). This can be used to perform per-trigger 1616 * initialization such as incrementing a per-trigger reference 1617 * count, for instance. This is usually implemented by the 1618 * generic utility function @event_trigger_init() (see 1619 * trace_event_triggers.c). 1620 * 1621 * @free: An optional de-initialization function called for the 1622 * trigger when the trigger is unregistered (via the 1623 * event_command @reg() function). This can be used to perform 1624 * per-trigger de-initialization such as decrementing a 1625 * per-trigger reference count and freeing corresponding trigger 1626 * data, for instance. This is usually implemented by the 1627 * generic utility function @event_trigger_free() (see 1628 * trace_event_triggers.c). 1629 * 1630 * @print: The callback function invoked to have the trigger print 1631 * itself. This is usually implemented by a wrapper function 1632 * that calls the generic utility function @event_trigger_print() 1633 * (see trace_event_triggers.c). 1634 */ 1635 struct event_trigger_ops { 1636 void (*func)(struct event_trigger_data *data, 1637 struct trace_buffer *buffer, void *rec, 1638 struct ring_buffer_event *rbe); 1639 int (*init)(struct event_trigger_ops *ops, 1640 struct event_trigger_data *data); 1641 void (*free)(struct event_trigger_ops *ops, 1642 struct event_trigger_data *data); 1643 int (*print)(struct seq_file *m, 1644 struct event_trigger_ops *ops, 1645 struct event_trigger_data *data); 1646 }; 1647 1648 /** 1649 * struct event_command - callbacks and data members for event commands 1650 * 1651 * Event commands are invoked by users by writing the command name 1652 * into the 'trigger' file associated with a trace event. The 1653 * parameters associated with a specific invocation of an event 1654 * command are used to create an event trigger instance, which is 1655 * added to the list of trigger instances associated with that trace 1656 * event. When the event is hit, the set of triggers associated with 1657 * that event is invoked. 1658 * 1659 * The data members in this structure provide per-event command data 1660 * for various event commands. 1661 * 1662 * All the data members below, except for @post_trigger, must be set 1663 * for each event command. 1664 * 1665 * @name: The unique name that identifies the event command. This is 1666 * the name used when setting triggers via trigger files. 1667 * 1668 * @trigger_type: A unique id that identifies the event command 1669 * 'type'. This value has two purposes, the first to ensure that 1670 * only one trigger of the same type can be set at a given time 1671 * for a particular event e.g. it doesn't make sense to have both 1672 * a traceon and traceoff trigger attached to a single event at 1673 * the same time, so traceon and traceoff have the same type 1674 * though they have different names. The @trigger_type value is 1675 * also used as a bit value for deferring the actual trigger 1676 * action until after the current event is finished. Some 1677 * commands need to do this if they themselves log to the trace 1678 * buffer (see the @post_trigger() member below). @trigger_type 1679 * values are defined by adding new values to the trigger_type 1680 * enum in include/linux/trace_events.h. 1681 * 1682 * @flags: See the enum event_command_flags below. 1683 * 1684 * All the methods below, except for @set_filter() and @unreg_all(), 1685 * must be implemented. 1686 * 1687 * @func: The callback function responsible for parsing and 1688 * registering the trigger written to the 'trigger' file by the 1689 * user. It allocates the trigger instance and registers it with 1690 * the appropriate trace event. It makes use of the other 1691 * event_command callback functions to orchestrate this, and is 1692 * usually implemented by the generic utility function 1693 * @event_trigger_callback() (see trace_event_triggers.c). 1694 * 1695 * @reg: Adds the trigger to the list of triggers associated with the 1696 * event, and enables the event trigger itself, after 1697 * initializing it (via the event_trigger_ops @init() function). 1698 * This is also where commands can use the @trigger_type value to 1699 * make the decision as to whether or not multiple instances of 1700 * the trigger should be allowed. This is usually implemented by 1701 * the generic utility function @register_trigger() (see 1702 * trace_event_triggers.c). 1703 * 1704 * @unreg: Removes the trigger from the list of triggers associated 1705 * with the event, and disables the event trigger itself, after 1706 * initializing it (via the event_trigger_ops @free() function). 1707 * This is usually implemented by the generic utility function 1708 * @unregister_trigger() (see trace_event_triggers.c). 1709 * 1710 * @unreg_all: An optional function called to remove all the triggers 1711 * from the list of triggers associated with the event. Called 1712 * when a trigger file is opened in truncate mode. 1713 * 1714 * @set_filter: An optional function called to parse and set a filter 1715 * for the trigger. If no @set_filter() method is set for the 1716 * event command, filters set by the user for the command will be 1717 * ignored. This is usually implemented by the generic utility 1718 * function @set_trigger_filter() (see trace_event_triggers.c). 1719 * 1720 * @get_trigger_ops: The callback function invoked to retrieve the 1721 * event_trigger_ops implementation associated with the command. 1722 */ 1723 struct event_command { 1724 struct list_head list; 1725 char *name; 1726 enum event_trigger_type trigger_type; 1727 int flags; 1728 int (*func)(struct event_command *cmd_ops, 1729 struct trace_event_file *file, 1730 char *glob, char *cmd, char *params); 1731 int (*reg)(char *glob, 1732 struct event_trigger_ops *ops, 1733 struct event_trigger_data *data, 1734 struct trace_event_file *file); 1735 void (*unreg)(char *glob, 1736 struct event_trigger_ops *ops, 1737 struct event_trigger_data *data, 1738 struct trace_event_file *file); 1739 void (*unreg_all)(struct trace_event_file *file); 1740 int (*set_filter)(char *filter_str, 1741 struct event_trigger_data *data, 1742 struct trace_event_file *file); 1743 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1744 }; 1745 1746 /** 1747 * enum event_command_flags - flags for struct event_command 1748 * 1749 * @POST_TRIGGER: A flag that says whether or not this command needs 1750 * to have its action delayed until after the current event has 1751 * been closed. Some triggers need to avoid being invoked while 1752 * an event is currently in the process of being logged, since 1753 * the trigger may itself log data into the trace buffer. Thus 1754 * we make sure the current event is committed before invoking 1755 * those triggers. To do that, the trigger invocation is split 1756 * in two - the first part checks the filter using the current 1757 * trace record; if a command has the @post_trigger flag set, it 1758 * sets a bit for itself in the return value, otherwise it 1759 * directly invokes the trigger. Once all commands have been 1760 * either invoked or set their return flag, the current record is 1761 * either committed or discarded. At that point, if any commands 1762 * have deferred their triggers, those commands are finally 1763 * invoked following the close of the current event. In other 1764 * words, if the event_trigger_ops @func() probe implementation 1765 * itself logs to the trace buffer, this flag should be set, 1766 * otherwise it can be left unspecified. 1767 * 1768 * @NEEDS_REC: A flag that says whether or not this command needs 1769 * access to the trace record in order to perform its function, 1770 * regardless of whether or not it has a filter associated with 1771 * it (filters make a trigger require access to the trace record 1772 * but are not always present). 1773 */ 1774 enum event_command_flags { 1775 EVENT_CMD_FL_POST_TRIGGER = 1, 1776 EVENT_CMD_FL_NEEDS_REC = 2, 1777 }; 1778 1779 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1780 { 1781 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1782 } 1783 1784 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1785 { 1786 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1787 } 1788 1789 extern int trace_event_enable_disable(struct trace_event_file *file, 1790 int enable, int soft_disable); 1791 extern int tracing_alloc_snapshot(void); 1792 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1793 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1794 1795 extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1796 extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1797 1798 extern const char *__start___trace_bprintk_fmt[]; 1799 extern const char *__stop___trace_bprintk_fmt[]; 1800 1801 extern const char *__start___tracepoint_str[]; 1802 extern const char *__stop___tracepoint_str[]; 1803 1804 void trace_printk_control(bool enabled); 1805 void trace_printk_start_comm(void); 1806 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1807 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1808 1809 /* Used from boot time tracer */ 1810 extern int trace_set_options(struct trace_array *tr, char *option); 1811 extern int tracing_set_tracer(struct trace_array *tr, const char *buf); 1812 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr, 1813 unsigned long size, int cpu_id); 1814 extern int tracing_set_cpumask(struct trace_array *tr, 1815 cpumask_var_t tracing_cpumask_new); 1816 1817 1818 #define MAX_EVENT_NAME_LEN 64 1819 1820 extern ssize_t trace_parse_run_command(struct file *file, 1821 const char __user *buffer, size_t count, loff_t *ppos, 1822 int (*createfn)(const char *)); 1823 1824 extern unsigned int err_pos(char *cmd, const char *str); 1825 extern void tracing_log_err(struct trace_array *tr, 1826 const char *loc, const char *cmd, 1827 const char **errs, u8 type, u8 pos); 1828 1829 /* 1830 * Normal trace_printk() and friends allocates special buffers 1831 * to do the manipulation, as well as saves the print formats 1832 * into sections to display. But the trace infrastructure wants 1833 * to use these without the added overhead at the price of being 1834 * a bit slower (used mainly for warnings, where we don't care 1835 * about performance). The internal_trace_puts() is for such 1836 * a purpose. 1837 */ 1838 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1839 1840 #undef FTRACE_ENTRY 1841 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 1842 extern struct trace_event_call \ 1843 __aligned(4) event_##call; 1844 #undef FTRACE_ENTRY_DUP 1845 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 1846 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1847 #undef FTRACE_ENTRY_PACKED 1848 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \ 1849 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1850 1851 #include "trace_entries.h" 1852 1853 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1854 int perf_ftrace_event_register(struct trace_event_call *call, 1855 enum trace_reg type, void *data); 1856 #else 1857 #define perf_ftrace_event_register NULL 1858 #endif 1859 1860 #ifdef CONFIG_FTRACE_SYSCALLS 1861 void init_ftrace_syscalls(void); 1862 const char *get_syscall_name(int syscall); 1863 #else 1864 static inline void init_ftrace_syscalls(void) { } 1865 static inline const char *get_syscall_name(int syscall) 1866 { 1867 return NULL; 1868 } 1869 #endif 1870 1871 #ifdef CONFIG_EVENT_TRACING 1872 void trace_event_init(void); 1873 void trace_event_eval_update(struct trace_eval_map **map, int len); 1874 /* Used from boot time tracer */ 1875 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); 1876 extern int trigger_process_regex(struct trace_event_file *file, char *buff); 1877 #else 1878 static inline void __init trace_event_init(void) { } 1879 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1880 #endif 1881 1882 #ifdef CONFIG_TRACER_SNAPSHOT 1883 void tracing_snapshot_instance(struct trace_array *tr); 1884 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1885 #else 1886 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1887 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1888 { 1889 return 0; 1890 } 1891 #endif 1892 1893 #ifdef CONFIG_PREEMPT_TRACER 1894 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1895 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1896 #else 1897 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1898 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1899 #endif 1900 #ifdef CONFIG_IRQSOFF_TRACER 1901 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1902 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1903 #else 1904 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1905 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1906 #endif 1907 1908 extern struct trace_iterator *tracepoint_print_iter; 1909 1910 /* 1911 * Reset the state of the trace_iterator so that it can read consumed data. 1912 * Normally, the trace_iterator is used for reading the data when it is not 1913 * consumed, and must retain state. 1914 */ 1915 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 1916 { 1917 const size_t offset = offsetof(struct trace_iterator, seq); 1918 1919 /* 1920 * Keep gcc from complaining about overwriting more than just one 1921 * member in the structure. 1922 */ 1923 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset); 1924 1925 iter->pos = -1; 1926 } 1927 1928 /* Check the name is good for event/group/fields */ 1929 static inline bool is_good_name(const char *name) 1930 { 1931 if (!isalpha(*name) && *name != '_') 1932 return false; 1933 while (*++name != '\0') { 1934 if (!isalpha(*name) && !isdigit(*name) && *name != '_') 1935 return false; 1936 } 1937 return true; 1938 } 1939 1940 /* Convert certain expected symbols into '_' when generating event names */ 1941 static inline void sanitize_event_name(char *name) 1942 { 1943 while (*name++ != '\0') 1944 if (*name == ':' || *name == '.') 1945 *name = '_'; 1946 } 1947 1948 /* 1949 * This is a generic way to read and write a u64 value from a file in tracefs. 1950 * 1951 * The value is stored on the variable pointed by *val. The value needs 1952 * to be at least *min and at most *max. The write is protected by an 1953 * existing *lock. 1954 */ 1955 struct trace_min_max_param { 1956 struct mutex *lock; 1957 u64 *val; 1958 u64 *min; 1959 u64 *max; 1960 }; 1961 1962 #define U64_STR_SIZE 24 /* 20 digits max */ 1963 1964 extern const struct file_operations trace_min_max_fops; 1965 1966 #endif /* _LINUX_KERNEL_TRACE_H */ 1967