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 __rel_dynamic_array 87 #define __rel_dynamic_array(type, item) type item[]; 88 89 #undef F_STRUCT 90 #define F_STRUCT(args...) args 91 92 #undef FTRACE_ENTRY 93 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 94 struct struct_name { \ 95 struct trace_entry ent; \ 96 tstruct \ 97 } 98 99 #undef FTRACE_ENTRY_DUP 100 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 101 102 #undef FTRACE_ENTRY_REG 103 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ 104 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 105 106 #undef FTRACE_ENTRY_PACKED 107 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ 108 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed 109 110 #include "trace_entries.h" 111 112 /* Use this for memory failure errors */ 113 #define MEM_FAIL(condition, fmt, ...) \ 114 DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__) 115 116 /* 117 * syscalls are special, and need special handling, this is why 118 * they are not included in trace_entries.h 119 */ 120 struct syscall_trace_enter { 121 struct trace_entry ent; 122 int nr; 123 unsigned long args[]; 124 }; 125 126 struct syscall_trace_exit { 127 struct trace_entry ent; 128 int nr; 129 long ret; 130 }; 131 132 struct kprobe_trace_entry_head { 133 struct trace_entry ent; 134 unsigned long ip; 135 }; 136 137 struct eprobe_trace_entry_head { 138 struct trace_entry ent; 139 }; 140 141 struct kretprobe_trace_entry_head { 142 struct trace_entry ent; 143 unsigned long func; 144 unsigned long ret_ip; 145 }; 146 147 #define TRACE_BUF_SIZE 1024 148 149 struct trace_array; 150 151 /* 152 * The CPU trace array - it consists of thousands of trace entries 153 * plus some other descriptor data: (for example which task started 154 * the trace, etc.) 155 */ 156 struct trace_array_cpu { 157 atomic_t disabled; 158 void *buffer_page; /* ring buffer spare */ 159 160 unsigned long entries; 161 unsigned long saved_latency; 162 unsigned long critical_start; 163 unsigned long critical_end; 164 unsigned long critical_sequence; 165 unsigned long nice; 166 unsigned long policy; 167 unsigned long rt_priority; 168 unsigned long skipped_entries; 169 u64 preempt_timestamp; 170 pid_t pid; 171 kuid_t uid; 172 char comm[TASK_COMM_LEN]; 173 174 #ifdef CONFIG_FUNCTION_TRACER 175 int ftrace_ignore_pid; 176 #endif 177 bool ignore_pid; 178 }; 179 180 struct tracer; 181 struct trace_option_dentry; 182 183 struct array_buffer { 184 struct trace_array *tr; 185 struct trace_buffer *buffer; 186 struct trace_array_cpu __percpu *data; 187 u64 time_start; 188 int cpu; 189 }; 190 191 #define TRACE_FLAGS_MAX_SIZE 32 192 193 struct trace_options { 194 struct tracer *tracer; 195 struct trace_option_dentry *topts; 196 }; 197 198 struct trace_pid_list *trace_pid_list_alloc(void); 199 void trace_pid_list_free(struct trace_pid_list *pid_list); 200 bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid); 201 int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid); 202 int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid); 203 int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid); 204 int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid, 205 unsigned int *next); 206 207 enum { 208 TRACE_PIDS = BIT(0), 209 TRACE_NO_PIDS = BIT(1), 210 }; 211 212 static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, 213 struct trace_pid_list *no_pid_list) 214 { 215 /* Return true if the pid list in type has pids */ 216 return ((type & TRACE_PIDS) && pid_list) || 217 ((type & TRACE_NO_PIDS) && no_pid_list); 218 } 219 220 static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, 221 struct trace_pid_list *no_pid_list) 222 { 223 /* 224 * Turning off what is in @type, return true if the "other" 225 * pid list, still has pids in it. 226 */ 227 return (!(type & TRACE_PIDS) && pid_list) || 228 (!(type & TRACE_NO_PIDS) && no_pid_list); 229 } 230 231 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 232 233 /** 234 * struct cond_snapshot - conditional snapshot data and callback 235 * 236 * The cond_snapshot structure encapsulates a callback function and 237 * data associated with the snapshot for a given tracing instance. 238 * 239 * When a snapshot is taken conditionally, by invoking 240 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 241 * passed in turn to the cond_snapshot.update() function. That data 242 * can be compared by the update() implementation with the cond_data 243 * contained within the struct cond_snapshot instance associated with 244 * the trace_array. Because the tr->max_lock is held throughout the 245 * update() call, the update() function can directly retrieve the 246 * cond_snapshot and cond_data associated with the per-instance 247 * snapshot associated with the trace_array. 248 * 249 * The cond_snapshot.update() implementation can save data to be 250 * associated with the snapshot if it decides to, and returns 'true' 251 * in that case, or it returns 'false' if the conditional snapshot 252 * shouldn't be taken. 253 * 254 * The cond_snapshot instance is created and associated with the 255 * user-defined cond_data by tracing_cond_snapshot_enable(). 256 * Likewise, the cond_snapshot instance is destroyed and is no longer 257 * associated with the trace instance by 258 * tracing_cond_snapshot_disable(). 259 * 260 * The method below is required. 261 * 262 * @update: When a conditional snapshot is invoked, the update() 263 * callback function is invoked with the tr->max_lock held. The 264 * update() implementation signals whether or not to actually 265 * take the snapshot, by returning 'true' if so, 'false' if no 266 * snapshot should be taken. Because the max_lock is held for 267 * the duration of update(), the implementation is safe to 268 * directly retrieved and save any implementation data it needs 269 * to in association with the snapshot. 270 */ 271 struct cond_snapshot { 272 void *cond_data; 273 cond_update_fn_t update; 274 }; 275 276 /* 277 * struct trace_func_repeats - used to keep track of the consecutive 278 * (on the same CPU) calls of a single function. 279 */ 280 struct trace_func_repeats { 281 unsigned long ip; 282 unsigned long parent_ip; 283 unsigned long count; 284 u64 ts_last_call; 285 }; 286 287 /* 288 * The trace array - an array of per-CPU trace arrays. This is the 289 * highest level data structure that individual tracers deal with. 290 * They have on/off state as well: 291 */ 292 struct trace_array { 293 struct list_head list; 294 char *name; 295 struct array_buffer array_buffer; 296 #ifdef CONFIG_TRACER_MAX_TRACE 297 /* 298 * The max_buffer is used to snapshot the trace when a maximum 299 * latency is reached, or when the user initiates a snapshot. 300 * Some tracers will use this to store a maximum trace while 301 * it continues examining live traces. 302 * 303 * The buffers for the max_buffer are set up the same as the array_buffer 304 * When a snapshot is taken, the buffer of the max_buffer is swapped 305 * with the buffer of the array_buffer and the buffers are reset for 306 * the array_buffer so the tracing can continue. 307 */ 308 struct array_buffer max_buffer; 309 bool allocated_snapshot; 310 #endif 311 #ifdef CONFIG_TRACER_MAX_TRACE 312 unsigned long max_latency; 313 #ifdef CONFIG_FSNOTIFY 314 struct dentry *d_max_latency; 315 struct work_struct fsnotify_work; 316 struct irq_work fsnotify_irqwork; 317 #endif 318 #endif 319 struct trace_pid_list __rcu *filtered_pids; 320 struct trace_pid_list __rcu *filtered_no_pids; 321 /* 322 * max_lock is used to protect the swapping of buffers 323 * when taking a max snapshot. The buffers themselves are 324 * protected by per_cpu spinlocks. But the action of the swap 325 * needs its own lock. 326 * 327 * This is defined as a arch_spinlock_t in order to help 328 * with performance when lockdep debugging is enabled. 329 * 330 * It is also used in other places outside the update_max_tr 331 * so it needs to be defined outside of the 332 * CONFIG_TRACER_MAX_TRACE. 333 */ 334 arch_spinlock_t max_lock; 335 int buffer_disabled; 336 #ifdef CONFIG_FTRACE_SYSCALLS 337 int sys_refcount_enter; 338 int sys_refcount_exit; 339 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 340 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 341 #endif 342 int stop_count; 343 int clock_id; 344 int nr_topts; 345 bool clear_trace; 346 int buffer_percent; 347 unsigned int n_err_log_entries; 348 struct tracer *current_trace; 349 unsigned int trace_flags; 350 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 351 unsigned int flags; 352 raw_spinlock_t start_lock; 353 struct list_head err_log; 354 struct dentry *dir; 355 struct dentry *options; 356 struct dentry *percpu_dir; 357 struct dentry *event_dir; 358 struct trace_options *topts; 359 struct list_head systems; 360 struct list_head events; 361 struct trace_event_file *trace_marker_file; 362 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 363 int ref; 364 int trace_ref; 365 #ifdef CONFIG_FUNCTION_TRACER 366 struct ftrace_ops *ops; 367 struct trace_pid_list __rcu *function_pids; 368 struct trace_pid_list __rcu *function_no_pids; 369 #ifdef CONFIG_DYNAMIC_FTRACE 370 /* All of these are protected by the ftrace_lock */ 371 struct list_head func_probes; 372 struct list_head mod_trace; 373 struct list_head mod_notrace; 374 #endif 375 /* function tracing enabled */ 376 int function_enabled; 377 #endif 378 int no_filter_buffering_ref; 379 struct list_head hist_vars; 380 #ifdef CONFIG_TRACER_SNAPSHOT 381 struct cond_snapshot *cond_snapshot; 382 #endif 383 struct trace_func_repeats __percpu *last_func_repeats; 384 }; 385 386 enum { 387 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 388 }; 389 390 extern struct list_head ftrace_trace_arrays; 391 392 extern struct mutex trace_types_lock; 393 394 extern int trace_array_get(struct trace_array *tr); 395 extern int tracing_check_open_get_tr(struct trace_array *tr); 396 extern struct trace_array *trace_array_find(const char *instance); 397 extern struct trace_array *trace_array_find_get(const char *instance); 398 399 extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe); 400 extern int tracing_set_filter_buffering(struct trace_array *tr, bool set); 401 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 402 403 extern bool trace_clock_in_ns(struct trace_array *tr); 404 405 /* 406 * The global tracer (top) should be the first trace array added, 407 * but we check the flag anyway. 408 */ 409 static inline struct trace_array *top_trace_array(void) 410 { 411 struct trace_array *tr; 412 413 if (list_empty(&ftrace_trace_arrays)) 414 return NULL; 415 416 tr = list_entry(ftrace_trace_arrays.prev, 417 typeof(*tr), list); 418 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 419 return tr; 420 } 421 422 #define FTRACE_CMP_TYPE(var, type) \ 423 __builtin_types_compatible_p(typeof(var), type *) 424 425 #undef IF_ASSIGN 426 #define IF_ASSIGN(var, entry, etype, id) \ 427 if (FTRACE_CMP_TYPE(var, etype)) { \ 428 var = (typeof(var))(entry); \ 429 WARN_ON(id != 0 && (entry)->type != id); \ 430 break; \ 431 } 432 433 /* Will cause compile errors if type is not found. */ 434 extern void __ftrace_bad_type(void); 435 436 /* 437 * The trace_assign_type is a verifier that the entry type is 438 * the same as the type being assigned. To add new types simply 439 * add a line with the following format: 440 * 441 * IF_ASSIGN(var, ent, type, id); 442 * 443 * Where "type" is the trace type that includes the trace_entry 444 * as the "ent" item. And "id" is the trace identifier that is 445 * used in the trace_type enum. 446 * 447 * If the type can have more than one id, then use zero. 448 */ 449 #define trace_assign_type(var, ent) \ 450 do { \ 451 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 452 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 453 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 454 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 455 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 456 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 457 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 458 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 459 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\ 460 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\ 461 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 462 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 463 TRACE_MMIO_RW); \ 464 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 465 TRACE_MMIO_MAP); \ 466 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 467 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 468 TRACE_GRAPH_ENT); \ 469 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 470 TRACE_GRAPH_RET); \ 471 IF_ASSIGN(var, ent, struct func_repeats_entry, \ 472 TRACE_FUNC_REPEATS); \ 473 __ftrace_bad_type(); \ 474 } while (0) 475 476 /* 477 * An option specific to a tracer. This is a boolean value. 478 * The bit is the bit index that sets its value on the 479 * flags value in struct tracer_flags. 480 */ 481 struct tracer_opt { 482 const char *name; /* Will appear on the trace_options file */ 483 u32 bit; /* Mask assigned in val field in tracer_flags */ 484 }; 485 486 /* 487 * The set of specific options for a tracer. Your tracer 488 * have to set the initial value of the flags val. 489 */ 490 struct tracer_flags { 491 u32 val; 492 struct tracer_opt *opts; 493 struct tracer *trace; 494 }; 495 496 /* Makes more easy to define a tracer opt */ 497 #define TRACER_OPT(s, b) .name = #s, .bit = b 498 499 500 struct trace_option_dentry { 501 struct tracer_opt *opt; 502 struct tracer_flags *flags; 503 struct trace_array *tr; 504 struct dentry *entry; 505 }; 506 507 /** 508 * struct tracer - a specific tracer and its callbacks to interact with tracefs 509 * @name: the name chosen to select it on the available_tracers file 510 * @init: called when one switches to this tracer (echo name > current_tracer) 511 * @reset: called when one switches to another tracer 512 * @start: called when tracing is unpaused (echo 1 > tracing_on) 513 * @stop: called when tracing is paused (echo 0 > tracing_on) 514 * @update_thresh: called when tracing_thresh is updated 515 * @open: called when the trace file is opened 516 * @pipe_open: called when the trace_pipe file is opened 517 * @close: called when the trace file is released 518 * @pipe_close: called when the trace_pipe file is released 519 * @read: override the default read callback on trace_pipe 520 * @splice_read: override the default splice_read callback on trace_pipe 521 * @selftest: selftest to run on boot (see trace_selftest.c) 522 * @print_headers: override the first lines that describe your columns 523 * @print_line: callback that prints a trace 524 * @set_flag: signals one of your private flags changed (trace_options file) 525 * @flags: your private flags 526 */ 527 struct tracer { 528 const char *name; 529 int (*init)(struct trace_array *tr); 530 void (*reset)(struct trace_array *tr); 531 void (*start)(struct trace_array *tr); 532 void (*stop)(struct trace_array *tr); 533 int (*update_thresh)(struct trace_array *tr); 534 void (*open)(struct trace_iterator *iter); 535 void (*pipe_open)(struct trace_iterator *iter); 536 void (*close)(struct trace_iterator *iter); 537 void (*pipe_close)(struct trace_iterator *iter); 538 ssize_t (*read)(struct trace_iterator *iter, 539 struct file *filp, char __user *ubuf, 540 size_t cnt, loff_t *ppos); 541 ssize_t (*splice_read)(struct trace_iterator *iter, 542 struct file *filp, 543 loff_t *ppos, 544 struct pipe_inode_info *pipe, 545 size_t len, 546 unsigned int flags); 547 #ifdef CONFIG_FTRACE_STARTUP_TEST 548 int (*selftest)(struct tracer *trace, 549 struct trace_array *tr); 550 #endif 551 void (*print_header)(struct seq_file *m); 552 enum print_line_t (*print_line)(struct trace_iterator *iter); 553 /* If you handled the flag setting, return 0 */ 554 int (*set_flag)(struct trace_array *tr, 555 u32 old_flags, u32 bit, int set); 556 /* Return 0 if OK with change, else return non-zero */ 557 int (*flag_changed)(struct trace_array *tr, 558 u32 mask, int set); 559 struct tracer *next; 560 struct tracer_flags *flags; 561 int enabled; 562 bool print_max; 563 bool allow_instances; 564 #ifdef CONFIG_TRACER_MAX_TRACE 565 bool use_max_tr; 566 #endif 567 /* True if tracer cannot be enabled in kernel param */ 568 bool noboot; 569 }; 570 571 static inline struct ring_buffer_iter * 572 trace_buffer_iter(struct trace_iterator *iter, int cpu) 573 { 574 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 575 } 576 577 int tracer_init(struct tracer *t, struct trace_array *tr); 578 int tracing_is_enabled(void); 579 void tracing_reset_online_cpus(struct array_buffer *buf); 580 void tracing_reset_current(int cpu); 581 void tracing_reset_all_online_cpus(void); 582 void tracing_reset_all_online_cpus_unlocked(void); 583 int tracing_open_generic(struct inode *inode, struct file *filp); 584 int tracing_open_generic_tr(struct inode *inode, struct file *filp); 585 bool tracing_is_disabled(void); 586 bool tracer_tracing_is_on(struct trace_array *tr); 587 void tracer_tracing_on(struct trace_array *tr); 588 void tracer_tracing_off(struct trace_array *tr); 589 struct dentry *trace_create_file(const char *name, 590 umode_t mode, 591 struct dentry *parent, 592 void *data, 593 const struct file_operations *fops); 594 595 int tracing_init_dentry(void); 596 597 struct ring_buffer_event; 598 599 struct ring_buffer_event * 600 trace_buffer_lock_reserve(struct trace_buffer *buffer, 601 int type, 602 unsigned long len, 603 unsigned int trace_ctx); 604 605 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 606 struct trace_array_cpu *data); 607 608 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 609 int *ent_cpu, u64 *ent_ts); 610 611 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, 612 struct ring_buffer_event *event); 613 614 bool trace_is_tracepoint_string(const char *str); 615 const char *trace_event_format(struct trace_iterator *iter, const char *fmt); 616 void trace_check_vprintf(struct trace_iterator *iter, const char *fmt, 617 va_list ap) __printf(2, 0); 618 619 int trace_empty(struct trace_iterator *iter); 620 621 void *trace_find_next_entry_inc(struct trace_iterator *iter); 622 623 void trace_init_global_iter(struct trace_iterator *iter); 624 625 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 626 627 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 628 unsigned long trace_total_entries(struct trace_array *tr); 629 630 void trace_function(struct trace_array *tr, 631 unsigned long ip, 632 unsigned long parent_ip, 633 unsigned int trace_ctx); 634 void trace_graph_function(struct trace_array *tr, 635 unsigned long ip, 636 unsigned long parent_ip, 637 unsigned int trace_ctx); 638 void trace_latency_header(struct seq_file *m); 639 void trace_default_header(struct seq_file *m); 640 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 641 642 void trace_graph_return(struct ftrace_graph_ret *trace); 643 int trace_graph_entry(struct ftrace_graph_ent *trace); 644 void set_graph_array(struct trace_array *tr); 645 646 void tracing_start_cmdline_record(void); 647 void tracing_stop_cmdline_record(void); 648 void tracing_start_tgid_record(void); 649 void tracing_stop_tgid_record(void); 650 651 int register_tracer(struct tracer *type); 652 int is_tracing_stopped(void); 653 654 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 655 656 extern cpumask_var_t __read_mostly tracing_buffer_mask; 657 658 #define for_each_tracing_cpu(cpu) \ 659 for_each_cpu(cpu, tracing_buffer_mask) 660 661 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 662 663 extern unsigned long tracing_thresh; 664 665 /* PID filtering */ 666 667 extern int pid_max; 668 669 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 670 pid_t search_pid); 671 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 672 struct trace_pid_list *filtered_no_pids, 673 struct task_struct *task); 674 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 675 struct task_struct *self, 676 struct task_struct *task); 677 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 678 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 679 int trace_pid_show(struct seq_file *m, void *v); 680 void trace_free_pid_list(struct trace_pid_list *pid_list); 681 int trace_pid_write(struct trace_pid_list *filtered_pids, 682 struct trace_pid_list **new_pid_list, 683 const char __user *ubuf, size_t cnt); 684 685 #ifdef CONFIG_TRACER_MAX_TRACE 686 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 687 void *cond_data); 688 void update_max_tr_single(struct trace_array *tr, 689 struct task_struct *tsk, int cpu); 690 691 #ifdef CONFIG_FSNOTIFY 692 #define LATENCY_FS_NOTIFY 693 #endif 694 #endif /* CONFIG_TRACER_MAX_TRACE */ 695 696 #ifdef LATENCY_FS_NOTIFY 697 void latency_fsnotify(struct trace_array *tr); 698 #else 699 static inline void latency_fsnotify(struct trace_array *tr) { } 700 #endif 701 702 #ifdef CONFIG_STACKTRACE 703 void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip); 704 #else 705 static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, 706 int skip) 707 { 708 } 709 #endif /* CONFIG_STACKTRACE */ 710 711 void trace_last_func_repeats(struct trace_array *tr, 712 struct trace_func_repeats *last_info, 713 unsigned int trace_ctx); 714 715 extern u64 ftrace_now(int cpu); 716 717 extern void trace_find_cmdline(int pid, char comm[]); 718 extern int trace_find_tgid(int pid); 719 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 720 721 #ifdef CONFIG_DYNAMIC_FTRACE 722 extern unsigned long ftrace_update_tot_cnt; 723 extern unsigned long ftrace_number_of_pages; 724 extern unsigned long ftrace_number_of_groups; 725 void ftrace_init_trace_array(struct trace_array *tr); 726 #else 727 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 728 #endif 729 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 730 extern int DYN_FTRACE_TEST_NAME(void); 731 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 732 extern int DYN_FTRACE_TEST_NAME2(void); 733 734 extern bool ring_buffer_expanded; 735 extern bool tracing_selftest_disabled; 736 737 #ifdef CONFIG_FTRACE_STARTUP_TEST 738 extern void __init disable_tracing_selftest(const char *reason); 739 740 extern int trace_selftest_startup_function(struct tracer *trace, 741 struct trace_array *tr); 742 extern int trace_selftest_startup_function_graph(struct tracer *trace, 743 struct trace_array *tr); 744 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 745 struct trace_array *tr); 746 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 747 struct trace_array *tr); 748 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 749 struct trace_array *tr); 750 extern int trace_selftest_startup_wakeup(struct tracer *trace, 751 struct trace_array *tr); 752 extern int trace_selftest_startup_nop(struct tracer *trace, 753 struct trace_array *tr); 754 extern int trace_selftest_startup_branch(struct tracer *trace, 755 struct trace_array *tr); 756 /* 757 * Tracer data references selftest functions that only occur 758 * on boot up. These can be __init functions. Thus, when selftests 759 * are enabled, then the tracers need to reference __init functions. 760 */ 761 #define __tracer_data __refdata 762 #else 763 static inline void __init disable_tracing_selftest(const char *reason) 764 { 765 } 766 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 767 #define __tracer_data __read_mostly 768 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 769 770 extern void *head_page(struct trace_array_cpu *data); 771 extern unsigned long long ns2usecs(u64 nsec); 772 extern int 773 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 774 extern int 775 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 776 extern int 777 trace_array_vprintk(struct trace_array *tr, 778 unsigned long ip, const char *fmt, va_list args); 779 int trace_array_printk_buf(struct trace_buffer *buffer, 780 unsigned long ip, const char *fmt, ...); 781 void trace_printk_seq(struct trace_seq *s); 782 enum print_line_t print_trace_line(struct trace_iterator *iter); 783 784 extern char trace_find_mark(unsigned long long duration); 785 786 struct ftrace_hash; 787 788 struct ftrace_mod_load { 789 struct list_head list; 790 char *func; 791 char *module; 792 int enable; 793 }; 794 795 enum { 796 FTRACE_HASH_FL_MOD = (1 << 0), 797 }; 798 799 struct ftrace_hash { 800 unsigned long size_bits; 801 struct hlist_head *buckets; 802 unsigned long count; 803 unsigned long flags; 804 struct rcu_head rcu; 805 }; 806 807 struct ftrace_func_entry * 808 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 809 810 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 811 { 812 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 813 } 814 815 /* Standard output formatting function used for function return traces */ 816 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 817 818 /* Flag options */ 819 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 820 #define TRACE_GRAPH_PRINT_CPU 0x2 821 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 822 #define TRACE_GRAPH_PRINT_PROC 0x8 823 #define TRACE_GRAPH_PRINT_DURATION 0x10 824 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 825 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 826 #define TRACE_GRAPH_PRINT_IRQS 0x80 827 #define TRACE_GRAPH_PRINT_TAIL 0x100 828 #define TRACE_GRAPH_SLEEP_TIME 0x200 829 #define TRACE_GRAPH_GRAPH_TIME 0x400 830 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 831 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 832 833 extern void ftrace_graph_sleep_time_control(bool enable); 834 835 #ifdef CONFIG_FUNCTION_PROFILER 836 extern void ftrace_graph_graph_time_control(bool enable); 837 #else 838 static inline void ftrace_graph_graph_time_control(bool enable) { } 839 #endif 840 841 extern enum print_line_t 842 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 843 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 844 extern void 845 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 846 extern void graph_trace_open(struct trace_iterator *iter); 847 extern void graph_trace_close(struct trace_iterator *iter); 848 extern int __trace_graph_entry(struct trace_array *tr, 849 struct ftrace_graph_ent *trace, 850 unsigned int trace_ctx); 851 extern void __trace_graph_return(struct trace_array *tr, 852 struct ftrace_graph_ret *trace, 853 unsigned int trace_ctx); 854 855 #ifdef CONFIG_DYNAMIC_FTRACE 856 extern struct ftrace_hash __rcu *ftrace_graph_hash; 857 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; 858 859 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 860 { 861 unsigned long addr = trace->func; 862 int ret = 0; 863 struct ftrace_hash *hash; 864 865 preempt_disable_notrace(); 866 867 /* 868 * Have to open code "rcu_dereference_sched()" because the 869 * function graph tracer can be called when RCU is not 870 * "watching". 871 * Protected with schedule_on_each_cpu(ftrace_sync) 872 */ 873 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); 874 875 if (ftrace_hash_empty(hash)) { 876 ret = 1; 877 goto out; 878 } 879 880 if (ftrace_lookup_ip(hash, addr)) { 881 882 /* 883 * This needs to be cleared on the return functions 884 * when the depth is zero. 885 */ 886 trace_recursion_set(TRACE_GRAPH_BIT); 887 trace_recursion_set_depth(trace->depth); 888 889 /* 890 * If no irqs are to be traced, but a set_graph_function 891 * is set, and called by an interrupt handler, we still 892 * want to trace it. 893 */ 894 if (in_hardirq()) 895 trace_recursion_set(TRACE_IRQ_BIT); 896 else 897 trace_recursion_clear(TRACE_IRQ_BIT); 898 ret = 1; 899 } 900 901 out: 902 preempt_enable_notrace(); 903 return ret; 904 } 905 906 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 907 { 908 if (trace_recursion_test(TRACE_GRAPH_BIT) && 909 trace->depth == trace_recursion_depth()) 910 trace_recursion_clear(TRACE_GRAPH_BIT); 911 } 912 913 static inline int ftrace_graph_notrace_addr(unsigned long addr) 914 { 915 int ret = 0; 916 struct ftrace_hash *notrace_hash; 917 918 preempt_disable_notrace(); 919 920 /* 921 * Have to open code "rcu_dereference_sched()" because the 922 * function graph tracer can be called when RCU is not 923 * "watching". 924 * Protected with schedule_on_each_cpu(ftrace_sync) 925 */ 926 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, 927 !preemptible()); 928 929 if (ftrace_lookup_ip(notrace_hash, addr)) 930 ret = 1; 931 932 preempt_enable_notrace(); 933 return ret; 934 } 935 #else 936 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 937 { 938 return 1; 939 } 940 941 static inline int ftrace_graph_notrace_addr(unsigned long addr) 942 { 943 return 0; 944 } 945 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 946 { } 947 #endif /* CONFIG_DYNAMIC_FTRACE */ 948 949 extern unsigned int fgraph_max_depth; 950 951 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 952 { 953 /* trace it when it is-nested-in or is a function enabled. */ 954 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 955 ftrace_graph_addr(trace)) || 956 (trace->depth < 0) || 957 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 958 } 959 960 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 961 static inline enum print_line_t 962 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 963 { 964 return TRACE_TYPE_UNHANDLED; 965 } 966 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 967 968 extern struct list_head ftrace_pids; 969 970 #ifdef CONFIG_FUNCTION_TRACER 971 972 #define FTRACE_PID_IGNORE -1 973 #define FTRACE_PID_TRACE -2 974 975 struct ftrace_func_command { 976 struct list_head list; 977 char *name; 978 int (*func)(struct trace_array *tr, 979 struct ftrace_hash *hash, 980 char *func, char *cmd, 981 char *params, int enable); 982 }; 983 extern bool ftrace_filter_param __initdata; 984 static inline int ftrace_trace_task(struct trace_array *tr) 985 { 986 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) != 987 FTRACE_PID_IGNORE; 988 } 989 extern int ftrace_is_dead(void); 990 int ftrace_create_function_files(struct trace_array *tr, 991 struct dentry *parent); 992 void ftrace_destroy_function_files(struct trace_array *tr); 993 int ftrace_allocate_ftrace_ops(struct trace_array *tr); 994 void ftrace_free_ftrace_ops(struct trace_array *tr); 995 void ftrace_init_global_array_ops(struct trace_array *tr); 996 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 997 void ftrace_reset_array_ops(struct trace_array *tr); 998 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 999 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1000 struct dentry *d_tracer); 1001 void ftrace_clear_pids(struct trace_array *tr); 1002 int init_function_trace(void); 1003 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1004 #else 1005 static inline int ftrace_trace_task(struct trace_array *tr) 1006 { 1007 return 1; 1008 } 1009 static inline int ftrace_is_dead(void) { return 0; } 1010 static inline int 1011 ftrace_create_function_files(struct trace_array *tr, 1012 struct dentry *parent) 1013 { 1014 return 0; 1015 } 1016 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) 1017 { 1018 return 0; 1019 } 1020 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } 1021 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1022 static inline __init void 1023 ftrace_init_global_array_ops(struct trace_array *tr) { } 1024 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1025 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1026 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1027 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1028 static inline int init_function_trace(void) { return 0; } 1029 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1030 /* ftace_func_t type is not defined, use macro instead of static inline */ 1031 #define ftrace_init_array_ops(tr, func) do { } while (0) 1032 #endif /* CONFIG_FUNCTION_TRACER */ 1033 1034 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1035 1036 struct ftrace_probe_ops { 1037 void (*func)(unsigned long ip, 1038 unsigned long parent_ip, 1039 struct trace_array *tr, 1040 struct ftrace_probe_ops *ops, 1041 void *data); 1042 int (*init)(struct ftrace_probe_ops *ops, 1043 struct trace_array *tr, 1044 unsigned long ip, void *init_data, 1045 void **data); 1046 void (*free)(struct ftrace_probe_ops *ops, 1047 struct trace_array *tr, 1048 unsigned long ip, void *data); 1049 int (*print)(struct seq_file *m, 1050 unsigned long ip, 1051 struct ftrace_probe_ops *ops, 1052 void *data); 1053 }; 1054 1055 struct ftrace_func_mapper; 1056 typedef int (*ftrace_mapper_func)(void *data); 1057 1058 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1059 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1060 unsigned long ip); 1061 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1062 unsigned long ip, void *data); 1063 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1064 unsigned long ip); 1065 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1066 ftrace_mapper_func free_func); 1067 1068 extern int 1069 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1070 struct ftrace_probe_ops *ops, void *data); 1071 extern int 1072 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1073 struct ftrace_probe_ops *ops); 1074 extern void clear_ftrace_function_probes(struct trace_array *tr); 1075 1076 int register_ftrace_command(struct ftrace_func_command *cmd); 1077 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1078 1079 void ftrace_create_filter_files(struct ftrace_ops *ops, 1080 struct dentry *parent); 1081 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1082 1083 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, 1084 int len, int reset); 1085 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, 1086 int len, int reset); 1087 #else 1088 struct ftrace_func_command; 1089 1090 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1091 { 1092 return -EINVAL; 1093 } 1094 static inline __init int unregister_ftrace_command(char *cmd_name) 1095 { 1096 return -EINVAL; 1097 } 1098 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1099 { 1100 } 1101 1102 /* 1103 * The ops parameter passed in is usually undefined. 1104 * This must be a macro. 1105 */ 1106 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1107 #define ftrace_destroy_filter_files(ops) do { } while (0) 1108 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1109 1110 bool ftrace_event_is_function(struct trace_event_call *call); 1111 1112 /* 1113 * struct trace_parser - servers for reading the user input separated by spaces 1114 * @cont: set if the input is not complete - no final space char was found 1115 * @buffer: holds the parsed user input 1116 * @idx: user input length 1117 * @size: buffer size 1118 */ 1119 struct trace_parser { 1120 bool cont; 1121 char *buffer; 1122 unsigned idx; 1123 unsigned size; 1124 }; 1125 1126 static inline bool trace_parser_loaded(struct trace_parser *parser) 1127 { 1128 return (parser->idx != 0); 1129 } 1130 1131 static inline bool trace_parser_cont(struct trace_parser *parser) 1132 { 1133 return parser->cont; 1134 } 1135 1136 static inline void trace_parser_clear(struct trace_parser *parser) 1137 { 1138 parser->cont = false; 1139 parser->idx = 0; 1140 } 1141 1142 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1143 extern void trace_parser_put(struct trace_parser *parser); 1144 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1145 size_t cnt, loff_t *ppos); 1146 1147 /* 1148 * Only create function graph options if function graph is configured. 1149 */ 1150 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1151 # define FGRAPH_FLAGS \ 1152 C(DISPLAY_GRAPH, "display-graph"), 1153 #else 1154 # define FGRAPH_FLAGS 1155 #endif 1156 1157 #ifdef CONFIG_BRANCH_TRACER 1158 # define BRANCH_FLAGS \ 1159 C(BRANCH, "branch"), 1160 #else 1161 # define BRANCH_FLAGS 1162 #endif 1163 1164 #ifdef CONFIG_FUNCTION_TRACER 1165 # define FUNCTION_FLAGS \ 1166 C(FUNCTION, "function-trace"), \ 1167 C(FUNC_FORK, "function-fork"), 1168 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1169 #else 1170 # define FUNCTION_FLAGS 1171 # define FUNCTION_DEFAULT_FLAGS 0UL 1172 # define TRACE_ITER_FUNC_FORK 0UL 1173 #endif 1174 1175 #ifdef CONFIG_STACKTRACE 1176 # define STACK_FLAGS \ 1177 C(STACKTRACE, "stacktrace"), 1178 #else 1179 # define STACK_FLAGS 1180 #endif 1181 1182 /* 1183 * trace_iterator_flags is an enumeration that defines bit 1184 * positions into trace_flags that controls the output. 1185 * 1186 * NOTE: These bits must match the trace_options array in 1187 * trace.c (this macro guarantees it). 1188 */ 1189 #define TRACE_FLAGS \ 1190 C(PRINT_PARENT, "print-parent"), \ 1191 C(SYM_OFFSET, "sym-offset"), \ 1192 C(SYM_ADDR, "sym-addr"), \ 1193 C(VERBOSE, "verbose"), \ 1194 C(RAW, "raw"), \ 1195 C(HEX, "hex"), \ 1196 C(BIN, "bin"), \ 1197 C(BLOCK, "block"), \ 1198 C(PRINTK, "trace_printk"), \ 1199 C(ANNOTATE, "annotate"), \ 1200 C(USERSTACKTRACE, "userstacktrace"), \ 1201 C(SYM_USEROBJ, "sym-userobj"), \ 1202 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1203 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1204 C(LATENCY_FMT, "latency-format"), \ 1205 C(RECORD_CMD, "record-cmd"), \ 1206 C(RECORD_TGID, "record-tgid"), \ 1207 C(OVERWRITE, "overwrite"), \ 1208 C(STOP_ON_FREE, "disable_on_free"), \ 1209 C(IRQ_INFO, "irq-info"), \ 1210 C(MARKERS, "markers"), \ 1211 C(EVENT_FORK, "event-fork"), \ 1212 C(PAUSE_ON_TRACE, "pause-on-trace"), \ 1213 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \ 1214 FUNCTION_FLAGS \ 1215 FGRAPH_FLAGS \ 1216 STACK_FLAGS \ 1217 BRANCH_FLAGS 1218 1219 /* 1220 * By defining C, we can make TRACE_FLAGS a list of bit names 1221 * that will define the bits for the flag masks. 1222 */ 1223 #undef C 1224 #define C(a, b) TRACE_ITER_##a##_BIT 1225 1226 enum trace_iterator_bits { 1227 TRACE_FLAGS 1228 /* Make sure we don't go more than we have bits for */ 1229 TRACE_ITER_LAST_BIT 1230 }; 1231 1232 /* 1233 * By redefining C, we can make TRACE_FLAGS a list of masks that 1234 * use the bits as defined above. 1235 */ 1236 #undef C 1237 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1238 1239 enum trace_iterator_flags { TRACE_FLAGS }; 1240 1241 /* 1242 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1243 * control the output of kernel symbols. 1244 */ 1245 #define TRACE_ITER_SYM_MASK \ 1246 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1247 1248 extern struct tracer nop_trace; 1249 1250 #ifdef CONFIG_BRANCH_TRACER 1251 extern int enable_branch_tracing(struct trace_array *tr); 1252 extern void disable_branch_tracing(void); 1253 static inline int trace_branch_enable(struct trace_array *tr) 1254 { 1255 if (tr->trace_flags & TRACE_ITER_BRANCH) 1256 return enable_branch_tracing(tr); 1257 return 0; 1258 } 1259 static inline void trace_branch_disable(void) 1260 { 1261 /* due to races, always disable */ 1262 disable_branch_tracing(); 1263 } 1264 #else 1265 static inline int trace_branch_enable(struct trace_array *tr) 1266 { 1267 return 0; 1268 } 1269 static inline void trace_branch_disable(void) 1270 { 1271 } 1272 #endif /* CONFIG_BRANCH_TRACER */ 1273 1274 /* set ring buffers to default size if not already done so */ 1275 int tracing_update_buffers(void); 1276 1277 struct ftrace_event_field { 1278 struct list_head link; 1279 const char *name; 1280 const char *type; 1281 int filter_type; 1282 int offset; 1283 int size; 1284 int is_signed; 1285 int len; 1286 }; 1287 1288 struct prog_entry; 1289 1290 struct event_filter { 1291 struct prog_entry __rcu *prog; 1292 char *filter_string; 1293 }; 1294 1295 struct event_subsystem { 1296 struct list_head list; 1297 const char *name; 1298 struct event_filter *filter; 1299 int ref_count; 1300 }; 1301 1302 struct trace_subsystem_dir { 1303 struct list_head list; 1304 struct event_subsystem *subsystem; 1305 struct trace_array *tr; 1306 struct dentry *entry; 1307 int ref_count; 1308 int nr_events; 1309 }; 1310 1311 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1312 struct trace_buffer *buffer, 1313 struct ring_buffer_event *event); 1314 1315 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1316 struct trace_buffer *buffer, 1317 struct ring_buffer_event *event, 1318 unsigned int trcace_ctx, 1319 struct pt_regs *regs); 1320 1321 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1322 struct trace_buffer *buffer, 1323 struct ring_buffer_event *event, 1324 unsigned int trace_ctx) 1325 { 1326 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL); 1327 } 1328 1329 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1330 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1331 void trace_buffered_event_disable(void); 1332 void trace_buffered_event_enable(void); 1333 1334 static inline void 1335 __trace_event_discard_commit(struct trace_buffer *buffer, 1336 struct ring_buffer_event *event) 1337 { 1338 if (this_cpu_read(trace_buffered_event) == event) { 1339 /* Simply release the temp buffer and enable preemption */ 1340 this_cpu_dec(trace_buffered_event_cnt); 1341 preempt_enable_notrace(); 1342 return; 1343 } 1344 /* ring_buffer_discard_commit() enables preemption */ 1345 ring_buffer_discard_commit(buffer, event); 1346 } 1347 1348 /* 1349 * Helper function for event_trigger_unlock_commit{_regs}(). 1350 * If there are event triggers attached to this event that requires 1351 * filtering against its fields, then they will be called as the 1352 * entry already holds the field information of the current event. 1353 * 1354 * It also checks if the event should be discarded or not. 1355 * It is to be discarded if the event is soft disabled and the 1356 * event was only recorded to process triggers, or if the event 1357 * filter is active and this event did not match the filters. 1358 * 1359 * Returns true if the event is discarded, false otherwise. 1360 */ 1361 static inline bool 1362 __event_trigger_test_discard(struct trace_event_file *file, 1363 struct trace_buffer *buffer, 1364 struct ring_buffer_event *event, 1365 void *entry, 1366 enum event_trigger_type *tt) 1367 { 1368 unsigned long eflags = file->flags; 1369 1370 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1371 *tt = event_triggers_call(file, buffer, entry, event); 1372 1373 if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED | 1374 EVENT_FILE_FL_FILTERED | 1375 EVENT_FILE_FL_PID_FILTER)))) 1376 return false; 1377 1378 if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) 1379 goto discard; 1380 1381 if (file->flags & EVENT_FILE_FL_FILTERED && 1382 !filter_match_preds(file->filter, entry)) 1383 goto discard; 1384 1385 if ((file->flags & EVENT_FILE_FL_PID_FILTER) && 1386 trace_event_ignore_this_pid(file)) 1387 goto discard; 1388 1389 return false; 1390 discard: 1391 __trace_event_discard_commit(buffer, event); 1392 return true; 1393 } 1394 1395 /** 1396 * event_trigger_unlock_commit - handle triggers and finish event commit 1397 * @file: The file pointer associated with the event 1398 * @buffer: The ring buffer that the event is being written to 1399 * @event: The event meta data in the ring buffer 1400 * @entry: The event itself 1401 * @trace_ctx: The tracing context flags. 1402 * 1403 * This is a helper function to handle triggers that require data 1404 * from the event itself. It also tests the event against filters and 1405 * if the event is soft disabled and should be discarded. 1406 */ 1407 static inline void 1408 event_trigger_unlock_commit(struct trace_event_file *file, 1409 struct trace_buffer *buffer, 1410 struct ring_buffer_event *event, 1411 void *entry, unsigned int trace_ctx) 1412 { 1413 enum event_trigger_type tt = ETT_NONE; 1414 1415 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1416 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx); 1417 1418 if (tt) 1419 event_triggers_post_call(file, tt); 1420 } 1421 1422 #define FILTER_PRED_INVALID ((unsigned short)-1) 1423 #define FILTER_PRED_IS_RIGHT (1 << 15) 1424 #define FILTER_PRED_FOLD (1 << 15) 1425 1426 /* 1427 * The max preds is the size of unsigned short with 1428 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1429 * and FOLD flags. The other is reserved. 1430 * 1431 * 2^14 preds is way more than enough. 1432 */ 1433 #define MAX_FILTER_PRED 16384 1434 1435 struct filter_pred; 1436 struct regex; 1437 1438 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1439 1440 enum regex_type { 1441 MATCH_FULL = 0, 1442 MATCH_FRONT_ONLY, 1443 MATCH_MIDDLE_ONLY, 1444 MATCH_END_ONLY, 1445 MATCH_GLOB, 1446 MATCH_INDEX, 1447 }; 1448 1449 struct regex { 1450 char pattern[MAX_FILTER_STR_VAL]; 1451 int len; 1452 int field_len; 1453 regex_match_func match; 1454 }; 1455 1456 static inline bool is_string_field(struct ftrace_event_field *field) 1457 { 1458 return field->filter_type == FILTER_DYN_STRING || 1459 field->filter_type == FILTER_RDYN_STRING || 1460 field->filter_type == FILTER_STATIC_STRING || 1461 field->filter_type == FILTER_PTR_STRING || 1462 field->filter_type == FILTER_COMM; 1463 } 1464 1465 static inline bool is_function_field(struct ftrace_event_field *field) 1466 { 1467 return field->filter_type == FILTER_TRACE_FN; 1468 } 1469 1470 extern enum regex_type 1471 filter_parse_regex(char *buff, int len, char **search, int *not); 1472 extern void print_event_filter(struct trace_event_file *file, 1473 struct trace_seq *s); 1474 extern int apply_event_filter(struct trace_event_file *file, 1475 char *filter_string); 1476 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1477 char *filter_string); 1478 extern void print_subsystem_event_filter(struct event_subsystem *system, 1479 struct trace_seq *s); 1480 extern int filter_assign_type(const char *type); 1481 extern int create_event_filter(struct trace_array *tr, 1482 struct trace_event_call *call, 1483 char *filter_str, bool set_str, 1484 struct event_filter **filterp); 1485 extern void free_event_filter(struct event_filter *filter); 1486 1487 struct ftrace_event_field * 1488 trace_find_event_field(struct trace_event_call *call, char *name); 1489 1490 extern void trace_event_enable_cmd_record(bool enable); 1491 extern void trace_event_enable_tgid_record(bool enable); 1492 1493 extern int event_trace_init(void); 1494 extern int init_events(void); 1495 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1496 extern int event_trace_del_tracer(struct trace_array *tr); 1497 extern void __trace_early_add_events(struct trace_array *tr); 1498 1499 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1500 const char *system, 1501 const char *event); 1502 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1503 const char *system, 1504 const char *event); 1505 1506 static inline void *event_file_data(struct file *filp) 1507 { 1508 return READ_ONCE(file_inode(filp)->i_private); 1509 } 1510 1511 extern struct mutex event_mutex; 1512 extern struct list_head ftrace_events; 1513 1514 extern const struct file_operations event_trigger_fops; 1515 extern const struct file_operations event_hist_fops; 1516 extern const struct file_operations event_hist_debug_fops; 1517 extern const struct file_operations event_inject_fops; 1518 1519 #ifdef CONFIG_HIST_TRIGGERS 1520 extern int register_trigger_hist_cmd(void); 1521 extern int register_trigger_hist_enable_disable_cmds(void); 1522 #else 1523 static inline int register_trigger_hist_cmd(void) { return 0; } 1524 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1525 #endif 1526 1527 extern int register_trigger_cmds(void); 1528 extern void clear_event_triggers(struct trace_array *tr); 1529 1530 enum { 1531 EVENT_TRIGGER_FL_PROBE = BIT(0), 1532 }; 1533 1534 struct event_trigger_data { 1535 unsigned long count; 1536 int ref; 1537 int flags; 1538 struct event_trigger_ops *ops; 1539 struct event_command *cmd_ops; 1540 struct event_filter __rcu *filter; 1541 char *filter_str; 1542 void *private_data; 1543 bool paused; 1544 bool paused_tmp; 1545 struct list_head list; 1546 char *name; 1547 struct list_head named_list; 1548 struct event_trigger_data *named_data; 1549 }; 1550 1551 /* Avoid typos */ 1552 #define ENABLE_EVENT_STR "enable_event" 1553 #define DISABLE_EVENT_STR "disable_event" 1554 #define ENABLE_HIST_STR "enable_hist" 1555 #define DISABLE_HIST_STR "disable_hist" 1556 1557 struct enable_trigger_data { 1558 struct trace_event_file *file; 1559 bool enable; 1560 bool hist; 1561 }; 1562 1563 extern int event_enable_trigger_print(struct seq_file *m, 1564 struct event_trigger_data *data); 1565 extern void event_enable_trigger_free(struct event_trigger_data *data); 1566 extern int event_enable_trigger_parse(struct event_command *cmd_ops, 1567 struct trace_event_file *file, 1568 char *glob, char *cmd, 1569 char *param_and_filter); 1570 extern int event_enable_register_trigger(char *glob, 1571 struct event_trigger_data *data, 1572 struct trace_event_file *file); 1573 extern void event_enable_unregister_trigger(char *glob, 1574 struct event_trigger_data *test, 1575 struct trace_event_file *file); 1576 extern void trigger_data_free(struct event_trigger_data *data); 1577 extern int event_trigger_init(struct event_trigger_data *data); 1578 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1579 int trigger_enable); 1580 extern void update_cond_flag(struct trace_event_file *file); 1581 extern int set_trigger_filter(char *filter_str, 1582 struct event_trigger_data *trigger_data, 1583 struct trace_event_file *file); 1584 extern struct event_trigger_data *find_named_trigger(const char *name); 1585 extern bool is_named_trigger(struct event_trigger_data *test); 1586 extern int save_named_trigger(const char *name, 1587 struct event_trigger_data *data); 1588 extern void del_named_trigger(struct event_trigger_data *data); 1589 extern void pause_named_trigger(struct event_trigger_data *data); 1590 extern void unpause_named_trigger(struct event_trigger_data *data); 1591 extern void set_named_trigger_data(struct event_trigger_data *data, 1592 struct event_trigger_data *named_data); 1593 extern struct event_trigger_data * 1594 get_named_trigger_data(struct event_trigger_data *data); 1595 extern int register_event_command(struct event_command *cmd); 1596 extern int unregister_event_command(struct event_command *cmd); 1597 extern int register_trigger_hist_enable_disable_cmds(void); 1598 extern bool event_trigger_check_remove(const char *glob); 1599 extern bool event_trigger_empty_param(const char *param); 1600 extern int event_trigger_separate_filter(char *param_and_filter, char **param, 1601 char **filter, bool param_required); 1602 extern struct event_trigger_data * 1603 event_trigger_alloc(struct event_command *cmd_ops, 1604 char *cmd, 1605 char *param, 1606 void *private_data); 1607 extern int event_trigger_parse_num(char *trigger, 1608 struct event_trigger_data *trigger_data); 1609 extern int event_trigger_set_filter(struct event_command *cmd_ops, 1610 struct trace_event_file *file, 1611 char *param, 1612 struct event_trigger_data *trigger_data); 1613 extern void event_trigger_reset_filter(struct event_command *cmd_ops, 1614 struct event_trigger_data *trigger_data); 1615 extern int event_trigger_register(struct event_command *cmd_ops, 1616 struct trace_event_file *file, 1617 char *glob, 1618 struct event_trigger_data *trigger_data); 1619 extern void event_trigger_unregister(struct event_command *cmd_ops, 1620 struct trace_event_file *file, 1621 char *glob, 1622 struct event_trigger_data *trigger_data); 1623 1624 /** 1625 * struct event_trigger_ops - callbacks for trace event triggers 1626 * 1627 * The methods in this structure provide per-event trigger hooks for 1628 * various trigger operations. 1629 * 1630 * The @init and @free methods are used during trigger setup and 1631 * teardown, typically called from an event_command's @parse() 1632 * function implementation. 1633 * 1634 * The @print method is used to print the trigger spec. 1635 * 1636 * The @trigger method is the function that actually implements the 1637 * trigger and is called in the context of the triggering event 1638 * whenever that event occurs. 1639 * 1640 * All the methods below, except for @init() and @free(), must be 1641 * implemented. 1642 * 1643 * @trigger: The trigger 'probe' function called when the triggering 1644 * event occurs. The data passed into this callback is the data 1645 * that was supplied to the event_command @reg() function that 1646 * registered the trigger (see struct event_command) along with 1647 * the trace record, rec. 1648 * 1649 * @init: An optional initialization function called for the trigger 1650 * when the trigger is registered (via the event_command reg() 1651 * function). This can be used to perform per-trigger 1652 * initialization such as incrementing a per-trigger reference 1653 * count, for instance. This is usually implemented by the 1654 * generic utility function @event_trigger_init() (see 1655 * trace_event_triggers.c). 1656 * 1657 * @free: An optional de-initialization function called for the 1658 * trigger when the trigger is unregistered (via the 1659 * event_command @reg() function). This can be used to perform 1660 * per-trigger de-initialization such as decrementing a 1661 * per-trigger reference count and freeing corresponding trigger 1662 * data, for instance. This is usually implemented by the 1663 * generic utility function @event_trigger_free() (see 1664 * trace_event_triggers.c). 1665 * 1666 * @print: The callback function invoked to have the trigger print 1667 * itself. This is usually implemented by a wrapper function 1668 * that calls the generic utility function @event_trigger_print() 1669 * (see trace_event_triggers.c). 1670 */ 1671 struct event_trigger_ops { 1672 void (*trigger)(struct event_trigger_data *data, 1673 struct trace_buffer *buffer, 1674 void *rec, 1675 struct ring_buffer_event *rbe); 1676 int (*init)(struct event_trigger_data *data); 1677 void (*free)(struct event_trigger_data *data); 1678 int (*print)(struct seq_file *m, 1679 struct event_trigger_data *data); 1680 }; 1681 1682 /** 1683 * struct event_command - callbacks and data members for event commands 1684 * 1685 * Event commands are invoked by users by writing the command name 1686 * into the 'trigger' file associated with a trace event. The 1687 * parameters associated with a specific invocation of an event 1688 * command are used to create an event trigger instance, which is 1689 * added to the list of trigger instances associated with that trace 1690 * event. When the event is hit, the set of triggers associated with 1691 * that event is invoked. 1692 * 1693 * The data members in this structure provide per-event command data 1694 * for various event commands. 1695 * 1696 * All the data members below, except for @post_trigger, must be set 1697 * for each event command. 1698 * 1699 * @name: The unique name that identifies the event command. This is 1700 * the name used when setting triggers via trigger files. 1701 * 1702 * @trigger_type: A unique id that identifies the event command 1703 * 'type'. This value has two purposes, the first to ensure that 1704 * only one trigger of the same type can be set at a given time 1705 * for a particular event e.g. it doesn't make sense to have both 1706 * a traceon and traceoff trigger attached to a single event at 1707 * the same time, so traceon and traceoff have the same type 1708 * though they have different names. The @trigger_type value is 1709 * also used as a bit value for deferring the actual trigger 1710 * action until after the current event is finished. Some 1711 * commands need to do this if they themselves log to the trace 1712 * buffer (see the @post_trigger() member below). @trigger_type 1713 * values are defined by adding new values to the trigger_type 1714 * enum in include/linux/trace_events.h. 1715 * 1716 * @flags: See the enum event_command_flags below. 1717 * 1718 * All the methods below, except for @set_filter() and @unreg_all(), 1719 * must be implemented. 1720 * 1721 * @parse: The callback function responsible for parsing and 1722 * registering the trigger written to the 'trigger' file by the 1723 * user. It allocates the trigger instance and registers it with 1724 * the appropriate trace event. It makes use of the other 1725 * event_command callback functions to orchestrate this, and is 1726 * usually implemented by the generic utility function 1727 * @event_trigger_callback() (see trace_event_triggers.c). 1728 * 1729 * @reg: Adds the trigger to the list of triggers associated with the 1730 * event, and enables the event trigger itself, after 1731 * initializing it (via the event_trigger_ops @init() function). 1732 * This is also where commands can use the @trigger_type value to 1733 * make the decision as to whether or not multiple instances of 1734 * the trigger should be allowed. This is usually implemented by 1735 * the generic utility function @register_trigger() (see 1736 * trace_event_triggers.c). 1737 * 1738 * @unreg: Removes the trigger from the list of triggers associated 1739 * with the event, and disables the event trigger itself, after 1740 * initializing it (via the event_trigger_ops @free() function). 1741 * This is usually implemented by the generic utility function 1742 * @unregister_trigger() (see trace_event_triggers.c). 1743 * 1744 * @unreg_all: An optional function called to remove all the triggers 1745 * from the list of triggers associated with the event. Called 1746 * when a trigger file is opened in truncate mode. 1747 * 1748 * @set_filter: An optional function called to parse and set a filter 1749 * for the trigger. If no @set_filter() method is set for the 1750 * event command, filters set by the user for the command will be 1751 * ignored. This is usually implemented by the generic utility 1752 * function @set_trigger_filter() (see trace_event_triggers.c). 1753 * 1754 * @get_trigger_ops: The callback function invoked to retrieve the 1755 * event_trigger_ops implementation associated with the command. 1756 * This callback function allows a single event_command to 1757 * support multiple trigger implementations via different sets of 1758 * event_trigger_ops, depending on the value of the @param 1759 * string. 1760 */ 1761 struct event_command { 1762 struct list_head list; 1763 char *name; 1764 enum event_trigger_type trigger_type; 1765 int flags; 1766 int (*parse)(struct event_command *cmd_ops, 1767 struct trace_event_file *file, 1768 char *glob, char *cmd, 1769 char *param_and_filter); 1770 int (*reg)(char *glob, 1771 struct event_trigger_data *data, 1772 struct trace_event_file *file); 1773 void (*unreg)(char *glob, 1774 struct event_trigger_data *data, 1775 struct trace_event_file *file); 1776 void (*unreg_all)(struct trace_event_file *file); 1777 int (*set_filter)(char *filter_str, 1778 struct event_trigger_data *data, 1779 struct trace_event_file *file); 1780 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1781 }; 1782 1783 /** 1784 * enum event_command_flags - flags for struct event_command 1785 * 1786 * @POST_TRIGGER: A flag that says whether or not this command needs 1787 * to have its action delayed until after the current event has 1788 * been closed. Some triggers need to avoid being invoked while 1789 * an event is currently in the process of being logged, since 1790 * the trigger may itself log data into the trace buffer. Thus 1791 * we make sure the current event is committed before invoking 1792 * those triggers. To do that, the trigger invocation is split 1793 * in two - the first part checks the filter using the current 1794 * trace record; if a command has the @post_trigger flag set, it 1795 * sets a bit for itself in the return value, otherwise it 1796 * directly invokes the trigger. Once all commands have been 1797 * either invoked or set their return flag, the current record is 1798 * either committed or discarded. At that point, if any commands 1799 * have deferred their triggers, those commands are finally 1800 * invoked following the close of the current event. In other 1801 * words, if the event_trigger_ops @func() probe implementation 1802 * itself logs to the trace buffer, this flag should be set, 1803 * otherwise it can be left unspecified. 1804 * 1805 * @NEEDS_REC: A flag that says whether or not this command needs 1806 * access to the trace record in order to perform its function, 1807 * regardless of whether or not it has a filter associated with 1808 * it (filters make a trigger require access to the trace record 1809 * but are not always present). 1810 */ 1811 enum event_command_flags { 1812 EVENT_CMD_FL_POST_TRIGGER = 1, 1813 EVENT_CMD_FL_NEEDS_REC = 2, 1814 }; 1815 1816 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1817 { 1818 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1819 } 1820 1821 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1822 { 1823 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1824 } 1825 1826 extern int trace_event_enable_disable(struct trace_event_file *file, 1827 int enable, int soft_disable); 1828 extern int tracing_alloc_snapshot(void); 1829 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1830 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1831 1832 extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1833 extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1834 1835 extern const char *__start___trace_bprintk_fmt[]; 1836 extern const char *__stop___trace_bprintk_fmt[]; 1837 1838 extern const char *__start___tracepoint_str[]; 1839 extern const char *__stop___tracepoint_str[]; 1840 1841 void trace_printk_control(bool enabled); 1842 void trace_printk_start_comm(void); 1843 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1844 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1845 1846 /* Used from boot time tracer */ 1847 extern int trace_set_options(struct trace_array *tr, char *option); 1848 extern int tracing_set_tracer(struct trace_array *tr, const char *buf); 1849 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr, 1850 unsigned long size, int cpu_id); 1851 extern int tracing_set_cpumask(struct trace_array *tr, 1852 cpumask_var_t tracing_cpumask_new); 1853 1854 1855 #define MAX_EVENT_NAME_LEN 64 1856 1857 extern ssize_t trace_parse_run_command(struct file *file, 1858 const char __user *buffer, size_t count, loff_t *ppos, 1859 int (*createfn)(const char *)); 1860 1861 extern unsigned int err_pos(char *cmd, const char *str); 1862 extern void tracing_log_err(struct trace_array *tr, 1863 const char *loc, const char *cmd, 1864 const char **errs, u8 type, u16 pos); 1865 1866 /* 1867 * Normal trace_printk() and friends allocates special buffers 1868 * to do the manipulation, as well as saves the print formats 1869 * into sections to display. But the trace infrastructure wants 1870 * to use these without the added overhead at the price of being 1871 * a bit slower (used mainly for warnings, where we don't care 1872 * about performance). The internal_trace_puts() is for such 1873 * a purpose. 1874 */ 1875 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1876 1877 #undef FTRACE_ENTRY 1878 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 1879 extern struct trace_event_call \ 1880 __aligned(4) event_##call; 1881 #undef FTRACE_ENTRY_DUP 1882 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 1883 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1884 #undef FTRACE_ENTRY_PACKED 1885 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \ 1886 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1887 1888 #include "trace_entries.h" 1889 1890 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1891 int perf_ftrace_event_register(struct trace_event_call *call, 1892 enum trace_reg type, void *data); 1893 #else 1894 #define perf_ftrace_event_register NULL 1895 #endif 1896 1897 #ifdef CONFIG_FTRACE_SYSCALLS 1898 void init_ftrace_syscalls(void); 1899 const char *get_syscall_name(int syscall); 1900 #else 1901 static inline void init_ftrace_syscalls(void) { } 1902 static inline const char *get_syscall_name(int syscall) 1903 { 1904 return NULL; 1905 } 1906 #endif 1907 1908 #ifdef CONFIG_EVENT_TRACING 1909 void trace_event_init(void); 1910 void trace_event_eval_update(struct trace_eval_map **map, int len); 1911 /* Used from boot time tracer */ 1912 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); 1913 extern int trigger_process_regex(struct trace_event_file *file, char *buff); 1914 #else 1915 static inline void __init trace_event_init(void) { } 1916 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1917 #endif 1918 1919 #ifdef CONFIG_TRACER_SNAPSHOT 1920 void tracing_snapshot_instance(struct trace_array *tr); 1921 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1922 #else 1923 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1924 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1925 { 1926 return 0; 1927 } 1928 #endif 1929 1930 #ifdef CONFIG_PREEMPT_TRACER 1931 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1932 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1933 #else 1934 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1935 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1936 #endif 1937 #ifdef CONFIG_IRQSOFF_TRACER 1938 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1939 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1940 #else 1941 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1942 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1943 #endif 1944 1945 /* 1946 * Reset the state of the trace_iterator so that it can read consumed data. 1947 * Normally, the trace_iterator is used for reading the data when it is not 1948 * consumed, and must retain state. 1949 */ 1950 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 1951 { 1952 memset_startat(iter, 0, seq); 1953 iter->pos = -1; 1954 } 1955 1956 /* Check the name is good for event/group/fields */ 1957 static inline bool __is_good_name(const char *name, bool hash_ok) 1958 { 1959 if (!isalpha(*name) && *name != '_' && (!hash_ok || *name != '-')) 1960 return false; 1961 while (*++name != '\0') { 1962 if (!isalpha(*name) && !isdigit(*name) && *name != '_' && 1963 (!hash_ok || *name != '-')) 1964 return false; 1965 } 1966 return true; 1967 } 1968 1969 /* Check the name is good for event/group/fields */ 1970 static inline bool is_good_name(const char *name) 1971 { 1972 return __is_good_name(name, false); 1973 } 1974 1975 /* Check the name is good for system */ 1976 static inline bool is_good_system_name(const char *name) 1977 { 1978 return __is_good_name(name, true); 1979 } 1980 1981 /* Convert certain expected symbols into '_' when generating event names */ 1982 static inline void sanitize_event_name(char *name) 1983 { 1984 while (*name++ != '\0') 1985 if (*name == ':' || *name == '.') 1986 *name = '_'; 1987 } 1988 1989 /* 1990 * This is a generic way to read and write a u64 value from a file in tracefs. 1991 * 1992 * The value is stored on the variable pointed by *val. The value needs 1993 * to be at least *min and at most *max. The write is protected by an 1994 * existing *lock. 1995 */ 1996 struct trace_min_max_param { 1997 struct mutex *lock; 1998 u64 *val; 1999 u64 *min; 2000 u64 *max; 2001 }; 2002 2003 #define U64_STR_SIZE 24 /* 20 digits max */ 2004 2005 extern const struct file_operations trace_min_max_fops; 2006 2007 #ifdef CONFIG_RV 2008 extern int rv_init_interface(void); 2009 #else 2010 static inline int rv_init_interface(void) 2011 { 2012 return 0; 2013 } 2014 #endif 2015 2016 #endif /* _LINUX_KERNEL_TRACE_H */ 2017