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 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \ 312 || defined(CONFIG_OSNOISE_TRACER) 313 unsigned long max_latency; 314 #ifdef CONFIG_FSNOTIFY 315 struct dentry *d_max_latency; 316 struct work_struct fsnotify_work; 317 struct irq_work fsnotify_irqwork; 318 #endif 319 #endif 320 struct trace_pid_list __rcu *filtered_pids; 321 struct trace_pid_list __rcu *filtered_no_pids; 322 /* 323 * max_lock is used to protect the swapping of buffers 324 * when taking a max snapshot. The buffers themselves are 325 * protected by per_cpu spinlocks. But the action of the swap 326 * needs its own lock. 327 * 328 * This is defined as a arch_spinlock_t in order to help 329 * with performance when lockdep debugging is enabled. 330 * 331 * It is also used in other places outside the update_max_tr 332 * so it needs to be defined outside of the 333 * CONFIG_TRACER_MAX_TRACE. 334 */ 335 arch_spinlock_t max_lock; 336 int buffer_disabled; 337 #ifdef CONFIG_FTRACE_SYSCALLS 338 int sys_refcount_enter; 339 int sys_refcount_exit; 340 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 341 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 342 #endif 343 int stop_count; 344 int clock_id; 345 int nr_topts; 346 bool clear_trace; 347 int buffer_percent; 348 unsigned int n_err_log_entries; 349 struct tracer *current_trace; 350 unsigned int trace_flags; 351 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 352 unsigned int flags; 353 raw_spinlock_t start_lock; 354 struct list_head err_log; 355 struct dentry *dir; 356 struct dentry *options; 357 struct dentry *percpu_dir; 358 struct dentry *event_dir; 359 struct trace_options *topts; 360 struct list_head systems; 361 struct list_head events; 362 struct trace_event_file *trace_marker_file; 363 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 364 int ref; 365 int trace_ref; 366 #ifdef CONFIG_FUNCTION_TRACER 367 struct ftrace_ops *ops; 368 struct trace_pid_list __rcu *function_pids; 369 struct trace_pid_list __rcu *function_no_pids; 370 #ifdef CONFIG_DYNAMIC_FTRACE 371 /* All of these are protected by the ftrace_lock */ 372 struct list_head func_probes; 373 struct list_head mod_trace; 374 struct list_head mod_notrace; 375 #endif 376 /* function tracing enabled */ 377 int function_enabled; 378 #endif 379 int no_filter_buffering_ref; 380 struct list_head hist_vars; 381 #ifdef CONFIG_TRACER_SNAPSHOT 382 struct cond_snapshot *cond_snapshot; 383 #endif 384 struct trace_func_repeats __percpu *last_func_repeats; 385 }; 386 387 enum { 388 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 389 }; 390 391 extern struct list_head ftrace_trace_arrays; 392 393 extern struct mutex trace_types_lock; 394 395 extern int trace_array_get(struct trace_array *tr); 396 extern int tracing_check_open_get_tr(struct trace_array *tr); 397 extern struct trace_array *trace_array_find(const char *instance); 398 extern struct trace_array *trace_array_find_get(const char *instance); 399 400 extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe); 401 extern int tracing_set_filter_buffering(struct trace_array *tr, bool set); 402 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 403 404 extern bool trace_clock_in_ns(struct trace_array *tr); 405 406 /* 407 * The global tracer (top) should be the first trace array added, 408 * but we check the flag anyway. 409 */ 410 static inline struct trace_array *top_trace_array(void) 411 { 412 struct trace_array *tr; 413 414 if (list_empty(&ftrace_trace_arrays)) 415 return NULL; 416 417 tr = list_entry(ftrace_trace_arrays.prev, 418 typeof(*tr), list); 419 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 420 return tr; 421 } 422 423 #define FTRACE_CMP_TYPE(var, type) \ 424 __builtin_types_compatible_p(typeof(var), type *) 425 426 #undef IF_ASSIGN 427 #define IF_ASSIGN(var, entry, etype, id) \ 428 if (FTRACE_CMP_TYPE(var, etype)) { \ 429 var = (typeof(var))(entry); \ 430 WARN_ON(id != 0 && (entry)->type != id); \ 431 break; \ 432 } 433 434 /* Will cause compile errors if type is not found. */ 435 extern void __ftrace_bad_type(void); 436 437 /* 438 * The trace_assign_type is a verifier that the entry type is 439 * the same as the type being assigned. To add new types simply 440 * add a line with the following format: 441 * 442 * IF_ASSIGN(var, ent, type, id); 443 * 444 * Where "type" is the trace type that includes the trace_entry 445 * as the "ent" item. And "id" is the trace identifier that is 446 * used in the trace_type enum. 447 * 448 * If the type can have more than one id, then use zero. 449 */ 450 #define trace_assign_type(var, ent) \ 451 do { \ 452 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 453 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 454 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 455 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 456 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 457 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 458 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 459 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 460 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\ 461 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\ 462 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 463 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 464 TRACE_MMIO_RW); \ 465 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 466 TRACE_MMIO_MAP); \ 467 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 468 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 469 TRACE_GRAPH_ENT); \ 470 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 471 TRACE_GRAPH_RET); \ 472 IF_ASSIGN(var, ent, struct func_repeats_entry, \ 473 TRACE_FUNC_REPEATS); \ 474 __ftrace_bad_type(); \ 475 } while (0) 476 477 /* 478 * An option specific to a tracer. This is a boolean value. 479 * The bit is the bit index that sets its value on the 480 * flags value in struct tracer_flags. 481 */ 482 struct tracer_opt { 483 const char *name; /* Will appear on the trace_options file */ 484 u32 bit; /* Mask assigned in val field in tracer_flags */ 485 }; 486 487 /* 488 * The set of specific options for a tracer. Your tracer 489 * have to set the initial value of the flags val. 490 */ 491 struct tracer_flags { 492 u32 val; 493 struct tracer_opt *opts; 494 struct tracer *trace; 495 }; 496 497 /* Makes more easy to define a tracer opt */ 498 #define TRACER_OPT(s, b) .name = #s, .bit = b 499 500 501 struct trace_option_dentry { 502 struct tracer_opt *opt; 503 struct tracer_flags *flags; 504 struct trace_array *tr; 505 struct dentry *entry; 506 }; 507 508 /** 509 * struct tracer - a specific tracer and its callbacks to interact with tracefs 510 * @name: the name chosen to select it on the available_tracers file 511 * @init: called when one switches to this tracer (echo name > current_tracer) 512 * @reset: called when one switches to another tracer 513 * @start: called when tracing is unpaused (echo 1 > tracing_on) 514 * @stop: called when tracing is paused (echo 0 > tracing_on) 515 * @update_thresh: called when tracing_thresh is updated 516 * @open: called when the trace file is opened 517 * @pipe_open: called when the trace_pipe file is opened 518 * @close: called when the trace file is released 519 * @pipe_close: called when the trace_pipe file is released 520 * @read: override the default read callback on trace_pipe 521 * @splice_read: override the default splice_read callback on trace_pipe 522 * @selftest: selftest to run on boot (see trace_selftest.c) 523 * @print_headers: override the first lines that describe your columns 524 * @print_line: callback that prints a trace 525 * @set_flag: signals one of your private flags changed (trace_options file) 526 * @flags: your private flags 527 */ 528 struct tracer { 529 const char *name; 530 int (*init)(struct trace_array *tr); 531 void (*reset)(struct trace_array *tr); 532 void (*start)(struct trace_array *tr); 533 void (*stop)(struct trace_array *tr); 534 int (*update_thresh)(struct trace_array *tr); 535 void (*open)(struct trace_iterator *iter); 536 void (*pipe_open)(struct trace_iterator *iter); 537 void (*close)(struct trace_iterator *iter); 538 void (*pipe_close)(struct trace_iterator *iter); 539 ssize_t (*read)(struct trace_iterator *iter, 540 struct file *filp, char __user *ubuf, 541 size_t cnt, loff_t *ppos); 542 ssize_t (*splice_read)(struct trace_iterator *iter, 543 struct file *filp, 544 loff_t *ppos, 545 struct pipe_inode_info *pipe, 546 size_t len, 547 unsigned int flags); 548 #ifdef CONFIG_FTRACE_STARTUP_TEST 549 int (*selftest)(struct tracer *trace, 550 struct trace_array *tr); 551 #endif 552 void (*print_header)(struct seq_file *m); 553 enum print_line_t (*print_line)(struct trace_iterator *iter); 554 /* If you handled the flag setting, return 0 */ 555 int (*set_flag)(struct trace_array *tr, 556 u32 old_flags, u32 bit, int set); 557 /* Return 0 if OK with change, else return non-zero */ 558 int (*flag_changed)(struct trace_array *tr, 559 u32 mask, int set); 560 struct tracer *next; 561 struct tracer_flags *flags; 562 int enabled; 563 bool print_max; 564 bool allow_instances; 565 #ifdef CONFIG_TRACER_MAX_TRACE 566 bool use_max_tr; 567 #endif 568 /* True if tracer cannot be enabled in kernel param */ 569 bool noboot; 570 }; 571 572 static inline struct ring_buffer_iter * 573 trace_buffer_iter(struct trace_iterator *iter, int cpu) 574 { 575 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 576 } 577 578 int tracer_init(struct tracer *t, struct trace_array *tr); 579 int tracing_is_enabled(void); 580 void tracing_reset_online_cpus(struct array_buffer *buf); 581 void tracing_reset_current(int cpu); 582 void tracing_reset_all_online_cpus(void); 583 void tracing_reset_all_online_cpus_unlocked(void); 584 int tracing_open_generic(struct inode *inode, struct file *filp); 585 int tracing_open_generic_tr(struct inode *inode, struct file *filp); 586 bool tracing_is_disabled(void); 587 bool tracer_tracing_is_on(struct trace_array *tr); 588 void tracer_tracing_on(struct trace_array *tr); 589 void tracer_tracing_off(struct trace_array *tr); 590 struct dentry *trace_create_file(const char *name, 591 umode_t mode, 592 struct dentry *parent, 593 void *data, 594 const struct file_operations *fops); 595 596 int tracing_init_dentry(void); 597 598 struct ring_buffer_event; 599 600 struct ring_buffer_event * 601 trace_buffer_lock_reserve(struct trace_buffer *buffer, 602 int type, 603 unsigned long len, 604 unsigned int trace_ctx); 605 606 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 607 struct trace_array_cpu *data); 608 609 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 610 int *ent_cpu, u64 *ent_ts); 611 612 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, 613 struct ring_buffer_event *event); 614 615 bool trace_is_tracepoint_string(const char *str); 616 const char *trace_event_format(struct trace_iterator *iter, const char *fmt); 617 void trace_check_vprintf(struct trace_iterator *iter, const char *fmt, 618 va_list ap); 619 620 int trace_empty(struct trace_iterator *iter); 621 622 void *trace_find_next_entry_inc(struct trace_iterator *iter); 623 624 void trace_init_global_iter(struct trace_iterator *iter); 625 626 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 627 628 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 629 unsigned long trace_total_entries(struct trace_array *tr); 630 631 void trace_function(struct trace_array *tr, 632 unsigned long ip, 633 unsigned long parent_ip, 634 unsigned int trace_ctx); 635 void trace_graph_function(struct trace_array *tr, 636 unsigned long ip, 637 unsigned long parent_ip, 638 unsigned int trace_ctx); 639 void trace_latency_header(struct seq_file *m); 640 void trace_default_header(struct seq_file *m); 641 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 642 643 void trace_graph_return(struct ftrace_graph_ret *trace); 644 int trace_graph_entry(struct ftrace_graph_ent *trace); 645 void set_graph_array(struct trace_array *tr); 646 647 void tracing_start_cmdline_record(void); 648 void tracing_stop_cmdline_record(void); 649 void tracing_start_tgid_record(void); 650 void tracing_stop_tgid_record(void); 651 652 int register_tracer(struct tracer *type); 653 int is_tracing_stopped(void); 654 655 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 656 657 extern cpumask_var_t __read_mostly tracing_buffer_mask; 658 659 #define for_each_tracing_cpu(cpu) \ 660 for_each_cpu(cpu, tracing_buffer_mask) 661 662 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 663 664 extern unsigned long tracing_thresh; 665 666 /* PID filtering */ 667 668 extern int pid_max; 669 670 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 671 pid_t search_pid); 672 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 673 struct trace_pid_list *filtered_no_pids, 674 struct task_struct *task); 675 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 676 struct task_struct *self, 677 struct task_struct *task); 678 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 679 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 680 int trace_pid_show(struct seq_file *m, void *v); 681 void trace_free_pid_list(struct trace_pid_list *pid_list); 682 int trace_pid_write(struct trace_pid_list *filtered_pids, 683 struct trace_pid_list **new_pid_list, 684 const char __user *ubuf, size_t cnt); 685 686 #ifdef CONFIG_TRACER_MAX_TRACE 687 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 688 void *cond_data); 689 void update_max_tr_single(struct trace_array *tr, 690 struct task_struct *tsk, int cpu); 691 #endif /* CONFIG_TRACER_MAX_TRACE */ 692 693 #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) \ 694 || defined(CONFIG_OSNOISE_TRACER)) && defined(CONFIG_FSNOTIFY) 695 #define LATENCY_FS_NOTIFY 696 #endif 697 698 #ifdef LATENCY_FS_NOTIFY 699 void latency_fsnotify(struct trace_array *tr); 700 #else 701 static inline void latency_fsnotify(struct trace_array *tr) { } 702 #endif 703 704 #ifdef CONFIG_STACKTRACE 705 void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip); 706 #else 707 static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, 708 int skip) 709 { 710 } 711 #endif /* CONFIG_STACKTRACE */ 712 713 void trace_last_func_repeats(struct trace_array *tr, 714 struct trace_func_repeats *last_info, 715 unsigned int trace_ctx); 716 717 extern u64 ftrace_now(int cpu); 718 719 extern void trace_find_cmdline(int pid, char comm[]); 720 extern int trace_find_tgid(int pid); 721 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 722 723 #ifdef CONFIG_DYNAMIC_FTRACE 724 extern unsigned long ftrace_update_tot_cnt; 725 extern unsigned long ftrace_number_of_pages; 726 extern unsigned long ftrace_number_of_groups; 727 void ftrace_init_trace_array(struct trace_array *tr); 728 #else 729 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 730 #endif 731 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 732 extern int DYN_FTRACE_TEST_NAME(void); 733 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 734 extern int DYN_FTRACE_TEST_NAME2(void); 735 736 extern bool ring_buffer_expanded; 737 extern bool tracing_selftest_disabled; 738 739 #ifdef CONFIG_FTRACE_STARTUP_TEST 740 extern void __init disable_tracing_selftest(const char *reason); 741 742 extern int trace_selftest_startup_function(struct tracer *trace, 743 struct trace_array *tr); 744 extern int trace_selftest_startup_function_graph(struct tracer *trace, 745 struct trace_array *tr); 746 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 747 struct trace_array *tr); 748 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 749 struct trace_array *tr); 750 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 751 struct trace_array *tr); 752 extern int trace_selftest_startup_wakeup(struct tracer *trace, 753 struct trace_array *tr); 754 extern int trace_selftest_startup_nop(struct tracer *trace, 755 struct trace_array *tr); 756 extern int trace_selftest_startup_branch(struct tracer *trace, 757 struct trace_array *tr); 758 /* 759 * Tracer data references selftest functions that only occur 760 * on boot up. These can be __init functions. Thus, when selftests 761 * are enabled, then the tracers need to reference __init functions. 762 */ 763 #define __tracer_data __refdata 764 #else 765 static inline void __init disable_tracing_selftest(const char *reason) 766 { 767 } 768 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 769 #define __tracer_data __read_mostly 770 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 771 772 extern void *head_page(struct trace_array_cpu *data); 773 extern unsigned long long ns2usecs(u64 nsec); 774 extern int 775 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 776 extern int 777 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 778 extern int 779 trace_array_vprintk(struct trace_array *tr, 780 unsigned long ip, const char *fmt, va_list args); 781 int trace_array_printk_buf(struct trace_buffer *buffer, 782 unsigned long ip, const char *fmt, ...); 783 void trace_printk_seq(struct trace_seq *s); 784 enum print_line_t print_trace_line(struct trace_iterator *iter); 785 786 extern char trace_find_mark(unsigned long long duration); 787 788 struct ftrace_hash; 789 790 struct ftrace_mod_load { 791 struct list_head list; 792 char *func; 793 char *module; 794 int enable; 795 }; 796 797 enum { 798 FTRACE_HASH_FL_MOD = (1 << 0), 799 }; 800 801 struct ftrace_hash { 802 unsigned long size_bits; 803 struct hlist_head *buckets; 804 unsigned long count; 805 unsigned long flags; 806 struct rcu_head rcu; 807 }; 808 809 struct ftrace_func_entry * 810 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 811 812 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 813 { 814 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 815 } 816 817 /* Standard output formatting function used for function return traces */ 818 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 819 820 /* Flag options */ 821 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 822 #define TRACE_GRAPH_PRINT_CPU 0x2 823 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 824 #define TRACE_GRAPH_PRINT_PROC 0x8 825 #define TRACE_GRAPH_PRINT_DURATION 0x10 826 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 827 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 828 #define TRACE_GRAPH_PRINT_IRQS 0x80 829 #define TRACE_GRAPH_PRINT_TAIL 0x100 830 #define TRACE_GRAPH_SLEEP_TIME 0x200 831 #define TRACE_GRAPH_GRAPH_TIME 0x400 832 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 833 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 834 835 extern void ftrace_graph_sleep_time_control(bool enable); 836 837 #ifdef CONFIG_FUNCTION_PROFILER 838 extern void ftrace_graph_graph_time_control(bool enable); 839 #else 840 static inline void ftrace_graph_graph_time_control(bool enable) { } 841 #endif 842 843 extern enum print_line_t 844 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 845 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 846 extern void 847 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 848 extern void graph_trace_open(struct trace_iterator *iter); 849 extern void graph_trace_close(struct trace_iterator *iter); 850 extern int __trace_graph_entry(struct trace_array *tr, 851 struct ftrace_graph_ent *trace, 852 unsigned int trace_ctx); 853 extern void __trace_graph_return(struct trace_array *tr, 854 struct ftrace_graph_ret *trace, 855 unsigned int trace_ctx); 856 857 #ifdef CONFIG_DYNAMIC_FTRACE 858 extern struct ftrace_hash __rcu *ftrace_graph_hash; 859 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; 860 861 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 862 { 863 unsigned long addr = trace->func; 864 int ret = 0; 865 struct ftrace_hash *hash; 866 867 preempt_disable_notrace(); 868 869 /* 870 * Have to open code "rcu_dereference_sched()" because the 871 * function graph tracer can be called when RCU is not 872 * "watching". 873 * Protected with schedule_on_each_cpu(ftrace_sync) 874 */ 875 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); 876 877 if (ftrace_hash_empty(hash)) { 878 ret = 1; 879 goto out; 880 } 881 882 if (ftrace_lookup_ip(hash, addr)) { 883 884 /* 885 * This needs to be cleared on the return functions 886 * when the depth is zero. 887 */ 888 trace_recursion_set(TRACE_GRAPH_BIT); 889 trace_recursion_set_depth(trace->depth); 890 891 /* 892 * If no irqs are to be traced, but a set_graph_function 893 * is set, and called by an interrupt handler, we still 894 * want to trace it. 895 */ 896 if (in_hardirq()) 897 trace_recursion_set(TRACE_IRQ_BIT); 898 else 899 trace_recursion_clear(TRACE_IRQ_BIT); 900 ret = 1; 901 } 902 903 out: 904 preempt_enable_notrace(); 905 return ret; 906 } 907 908 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 909 { 910 if (trace_recursion_test(TRACE_GRAPH_BIT) && 911 trace->depth == trace_recursion_depth()) 912 trace_recursion_clear(TRACE_GRAPH_BIT); 913 } 914 915 static inline int ftrace_graph_notrace_addr(unsigned long addr) 916 { 917 int ret = 0; 918 struct ftrace_hash *notrace_hash; 919 920 preempt_disable_notrace(); 921 922 /* 923 * Have to open code "rcu_dereference_sched()" because the 924 * function graph tracer can be called when RCU is not 925 * "watching". 926 * Protected with schedule_on_each_cpu(ftrace_sync) 927 */ 928 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, 929 !preemptible()); 930 931 if (ftrace_lookup_ip(notrace_hash, addr)) 932 ret = 1; 933 934 preempt_enable_notrace(); 935 return ret; 936 } 937 #else 938 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 939 { 940 return 1; 941 } 942 943 static inline int ftrace_graph_notrace_addr(unsigned long addr) 944 { 945 return 0; 946 } 947 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 948 { } 949 #endif /* CONFIG_DYNAMIC_FTRACE */ 950 951 extern unsigned int fgraph_max_depth; 952 953 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 954 { 955 /* trace it when it is-nested-in or is a function enabled. */ 956 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 957 ftrace_graph_addr(trace)) || 958 (trace->depth < 0) || 959 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 960 } 961 962 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 963 static inline enum print_line_t 964 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 965 { 966 return TRACE_TYPE_UNHANDLED; 967 } 968 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 969 970 extern struct list_head ftrace_pids; 971 972 #ifdef CONFIG_FUNCTION_TRACER 973 974 #define FTRACE_PID_IGNORE -1 975 #define FTRACE_PID_TRACE -2 976 977 struct ftrace_func_command { 978 struct list_head list; 979 char *name; 980 int (*func)(struct trace_array *tr, 981 struct ftrace_hash *hash, 982 char *func, char *cmd, 983 char *params, int enable); 984 }; 985 extern bool ftrace_filter_param __initdata; 986 static inline int ftrace_trace_task(struct trace_array *tr) 987 { 988 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) != 989 FTRACE_PID_IGNORE; 990 } 991 extern int ftrace_is_dead(void); 992 int ftrace_create_function_files(struct trace_array *tr, 993 struct dentry *parent); 994 void ftrace_destroy_function_files(struct trace_array *tr); 995 int ftrace_allocate_ftrace_ops(struct trace_array *tr); 996 void ftrace_free_ftrace_ops(struct trace_array *tr); 997 void ftrace_init_global_array_ops(struct trace_array *tr); 998 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 999 void ftrace_reset_array_ops(struct trace_array *tr); 1000 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 1001 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1002 struct dentry *d_tracer); 1003 void ftrace_clear_pids(struct trace_array *tr); 1004 int init_function_trace(void); 1005 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1006 #else 1007 static inline int ftrace_trace_task(struct trace_array *tr) 1008 { 1009 return 1; 1010 } 1011 static inline int ftrace_is_dead(void) { return 0; } 1012 static inline int 1013 ftrace_create_function_files(struct trace_array *tr, 1014 struct dentry *parent) 1015 { 1016 return 0; 1017 } 1018 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) 1019 { 1020 return 0; 1021 } 1022 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } 1023 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1024 static inline __init void 1025 ftrace_init_global_array_ops(struct trace_array *tr) { } 1026 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1027 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1028 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1029 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1030 static inline int init_function_trace(void) { return 0; } 1031 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1032 /* ftace_func_t type is not defined, use macro instead of static inline */ 1033 #define ftrace_init_array_ops(tr, func) do { } while (0) 1034 #endif /* CONFIG_FUNCTION_TRACER */ 1035 1036 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1037 1038 struct ftrace_probe_ops { 1039 void (*func)(unsigned long ip, 1040 unsigned long parent_ip, 1041 struct trace_array *tr, 1042 struct ftrace_probe_ops *ops, 1043 void *data); 1044 int (*init)(struct ftrace_probe_ops *ops, 1045 struct trace_array *tr, 1046 unsigned long ip, void *init_data, 1047 void **data); 1048 void (*free)(struct ftrace_probe_ops *ops, 1049 struct trace_array *tr, 1050 unsigned long ip, void *data); 1051 int (*print)(struct seq_file *m, 1052 unsigned long ip, 1053 struct ftrace_probe_ops *ops, 1054 void *data); 1055 }; 1056 1057 struct ftrace_func_mapper; 1058 typedef int (*ftrace_mapper_func)(void *data); 1059 1060 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1061 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1062 unsigned long ip); 1063 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1064 unsigned long ip, void *data); 1065 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1066 unsigned long ip); 1067 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1068 ftrace_mapper_func free_func); 1069 1070 extern int 1071 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1072 struct ftrace_probe_ops *ops, void *data); 1073 extern int 1074 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1075 struct ftrace_probe_ops *ops); 1076 extern void clear_ftrace_function_probes(struct trace_array *tr); 1077 1078 int register_ftrace_command(struct ftrace_func_command *cmd); 1079 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1080 1081 void ftrace_create_filter_files(struct ftrace_ops *ops, 1082 struct dentry *parent); 1083 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1084 1085 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, 1086 int len, int reset); 1087 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, 1088 int len, int reset); 1089 #else 1090 struct ftrace_func_command; 1091 1092 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1093 { 1094 return -EINVAL; 1095 } 1096 static inline __init int unregister_ftrace_command(char *cmd_name) 1097 { 1098 return -EINVAL; 1099 } 1100 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1101 { 1102 } 1103 1104 /* 1105 * The ops parameter passed in is usually undefined. 1106 * This must be a macro. 1107 */ 1108 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1109 #define ftrace_destroy_filter_files(ops) do { } while (0) 1110 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1111 1112 bool ftrace_event_is_function(struct trace_event_call *call); 1113 1114 /* 1115 * struct trace_parser - servers for reading the user input separated by spaces 1116 * @cont: set if the input is not complete - no final space char was found 1117 * @buffer: holds the parsed user input 1118 * @idx: user input length 1119 * @size: buffer size 1120 */ 1121 struct trace_parser { 1122 bool cont; 1123 char *buffer; 1124 unsigned idx; 1125 unsigned size; 1126 }; 1127 1128 static inline bool trace_parser_loaded(struct trace_parser *parser) 1129 { 1130 return (parser->idx != 0); 1131 } 1132 1133 static inline bool trace_parser_cont(struct trace_parser *parser) 1134 { 1135 return parser->cont; 1136 } 1137 1138 static inline void trace_parser_clear(struct trace_parser *parser) 1139 { 1140 parser->cont = false; 1141 parser->idx = 0; 1142 } 1143 1144 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1145 extern void trace_parser_put(struct trace_parser *parser); 1146 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1147 size_t cnt, loff_t *ppos); 1148 1149 /* 1150 * Only create function graph options if function graph is configured. 1151 */ 1152 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1153 # define FGRAPH_FLAGS \ 1154 C(DISPLAY_GRAPH, "display-graph"), 1155 #else 1156 # define FGRAPH_FLAGS 1157 #endif 1158 1159 #ifdef CONFIG_BRANCH_TRACER 1160 # define BRANCH_FLAGS \ 1161 C(BRANCH, "branch"), 1162 #else 1163 # define BRANCH_FLAGS 1164 #endif 1165 1166 #ifdef CONFIG_FUNCTION_TRACER 1167 # define FUNCTION_FLAGS \ 1168 C(FUNCTION, "function-trace"), \ 1169 C(FUNC_FORK, "function-fork"), 1170 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1171 #else 1172 # define FUNCTION_FLAGS 1173 # define FUNCTION_DEFAULT_FLAGS 0UL 1174 # define TRACE_ITER_FUNC_FORK 0UL 1175 #endif 1176 1177 #ifdef CONFIG_STACKTRACE 1178 # define STACK_FLAGS \ 1179 C(STACKTRACE, "stacktrace"), 1180 #else 1181 # define STACK_FLAGS 1182 #endif 1183 1184 /* 1185 * trace_iterator_flags is an enumeration that defines bit 1186 * positions into trace_flags that controls the output. 1187 * 1188 * NOTE: These bits must match the trace_options array in 1189 * trace.c (this macro guarantees it). 1190 */ 1191 #define TRACE_FLAGS \ 1192 C(PRINT_PARENT, "print-parent"), \ 1193 C(SYM_OFFSET, "sym-offset"), \ 1194 C(SYM_ADDR, "sym-addr"), \ 1195 C(VERBOSE, "verbose"), \ 1196 C(RAW, "raw"), \ 1197 C(HEX, "hex"), \ 1198 C(BIN, "bin"), \ 1199 C(BLOCK, "block"), \ 1200 C(PRINTK, "trace_printk"), \ 1201 C(ANNOTATE, "annotate"), \ 1202 C(USERSTACKTRACE, "userstacktrace"), \ 1203 C(SYM_USEROBJ, "sym-userobj"), \ 1204 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1205 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1206 C(LATENCY_FMT, "latency-format"), \ 1207 C(RECORD_CMD, "record-cmd"), \ 1208 C(RECORD_TGID, "record-tgid"), \ 1209 C(OVERWRITE, "overwrite"), \ 1210 C(STOP_ON_FREE, "disable_on_free"), \ 1211 C(IRQ_INFO, "irq-info"), \ 1212 C(MARKERS, "markers"), \ 1213 C(EVENT_FORK, "event-fork"), \ 1214 C(PAUSE_ON_TRACE, "pause-on-trace"), \ 1215 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \ 1216 FUNCTION_FLAGS \ 1217 FGRAPH_FLAGS \ 1218 STACK_FLAGS \ 1219 BRANCH_FLAGS 1220 1221 /* 1222 * By defining C, we can make TRACE_FLAGS a list of bit names 1223 * that will define the bits for the flag masks. 1224 */ 1225 #undef C 1226 #define C(a, b) TRACE_ITER_##a##_BIT 1227 1228 enum trace_iterator_bits { 1229 TRACE_FLAGS 1230 /* Make sure we don't go more than we have bits for */ 1231 TRACE_ITER_LAST_BIT 1232 }; 1233 1234 /* 1235 * By redefining C, we can make TRACE_FLAGS a list of masks that 1236 * use the bits as defined above. 1237 */ 1238 #undef C 1239 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1240 1241 enum trace_iterator_flags { TRACE_FLAGS }; 1242 1243 /* 1244 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1245 * control the output of kernel symbols. 1246 */ 1247 #define TRACE_ITER_SYM_MASK \ 1248 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1249 1250 extern struct tracer nop_trace; 1251 1252 #ifdef CONFIG_BRANCH_TRACER 1253 extern int enable_branch_tracing(struct trace_array *tr); 1254 extern void disable_branch_tracing(void); 1255 static inline int trace_branch_enable(struct trace_array *tr) 1256 { 1257 if (tr->trace_flags & TRACE_ITER_BRANCH) 1258 return enable_branch_tracing(tr); 1259 return 0; 1260 } 1261 static inline void trace_branch_disable(void) 1262 { 1263 /* due to races, always disable */ 1264 disable_branch_tracing(); 1265 } 1266 #else 1267 static inline int trace_branch_enable(struct trace_array *tr) 1268 { 1269 return 0; 1270 } 1271 static inline void trace_branch_disable(void) 1272 { 1273 } 1274 #endif /* CONFIG_BRANCH_TRACER */ 1275 1276 /* set ring buffers to default size if not already done so */ 1277 int tracing_update_buffers(void); 1278 1279 struct ftrace_event_field { 1280 struct list_head link; 1281 const char *name; 1282 const char *type; 1283 int filter_type; 1284 int offset; 1285 int size; 1286 int is_signed; 1287 }; 1288 1289 struct prog_entry; 1290 1291 struct event_filter { 1292 struct prog_entry __rcu *prog; 1293 char *filter_string; 1294 }; 1295 1296 struct event_subsystem { 1297 struct list_head list; 1298 const char *name; 1299 struct event_filter *filter; 1300 int ref_count; 1301 }; 1302 1303 struct trace_subsystem_dir { 1304 struct list_head list; 1305 struct event_subsystem *subsystem; 1306 struct trace_array *tr; 1307 struct dentry *entry; 1308 int ref_count; 1309 int nr_events; 1310 }; 1311 1312 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1313 struct trace_buffer *buffer, 1314 struct ring_buffer_event *event); 1315 1316 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1317 struct trace_buffer *buffer, 1318 struct ring_buffer_event *event, 1319 unsigned int trcace_ctx, 1320 struct pt_regs *regs); 1321 1322 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1323 struct trace_buffer *buffer, 1324 struct ring_buffer_event *event, 1325 unsigned int trace_ctx) 1326 { 1327 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL); 1328 } 1329 1330 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1331 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1332 void trace_buffered_event_disable(void); 1333 void trace_buffered_event_enable(void); 1334 1335 static inline void 1336 __trace_event_discard_commit(struct trace_buffer *buffer, 1337 struct ring_buffer_event *event) 1338 { 1339 if (this_cpu_read(trace_buffered_event) == event) { 1340 /* Simply release the temp buffer and enable preemption */ 1341 this_cpu_dec(trace_buffered_event_cnt); 1342 preempt_enable_notrace(); 1343 return; 1344 } 1345 /* ring_buffer_discard_commit() enables preemption */ 1346 ring_buffer_discard_commit(buffer, event); 1347 } 1348 1349 /* 1350 * Helper function for event_trigger_unlock_commit{_regs}(). 1351 * If there are event triggers attached to this event that requires 1352 * filtering against its fields, then they will be called as the 1353 * entry already holds the field information of the current event. 1354 * 1355 * It also checks if the event should be discarded or not. 1356 * It is to be discarded if the event is soft disabled and the 1357 * event was only recorded to process triggers, or if the event 1358 * filter is active and this event did not match the filters. 1359 * 1360 * Returns true if the event is discarded, false otherwise. 1361 */ 1362 static inline bool 1363 __event_trigger_test_discard(struct trace_event_file *file, 1364 struct trace_buffer *buffer, 1365 struct ring_buffer_event *event, 1366 void *entry, 1367 enum event_trigger_type *tt) 1368 { 1369 unsigned long eflags = file->flags; 1370 1371 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1372 *tt = event_triggers_call(file, buffer, entry, event); 1373 1374 if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED | 1375 EVENT_FILE_FL_FILTERED | 1376 EVENT_FILE_FL_PID_FILTER)))) 1377 return false; 1378 1379 if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) 1380 goto discard; 1381 1382 if (file->flags & EVENT_FILE_FL_FILTERED && 1383 !filter_match_preds(file->filter, entry)) 1384 goto discard; 1385 1386 if ((file->flags & EVENT_FILE_FL_PID_FILTER) && 1387 trace_event_ignore_this_pid(file)) 1388 goto discard; 1389 1390 return false; 1391 discard: 1392 __trace_event_discard_commit(buffer, event); 1393 return true; 1394 } 1395 1396 /** 1397 * event_trigger_unlock_commit - handle triggers and finish event commit 1398 * @file: The file pointer associated with the event 1399 * @buffer: The ring buffer that the event is being written to 1400 * @event: The event meta data in the ring buffer 1401 * @entry: The event itself 1402 * @trace_ctx: The tracing context flags. 1403 * 1404 * This is a helper function to handle triggers that require data 1405 * from the event itself. It also tests the event against filters and 1406 * if the event is soft disabled and should be discarded. 1407 */ 1408 static inline void 1409 event_trigger_unlock_commit(struct trace_event_file *file, 1410 struct trace_buffer *buffer, 1411 struct ring_buffer_event *event, 1412 void *entry, unsigned int trace_ctx) 1413 { 1414 enum event_trigger_type tt = ETT_NONE; 1415 1416 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1417 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx); 1418 1419 if (tt) 1420 event_triggers_post_call(file, tt); 1421 } 1422 1423 #define FILTER_PRED_INVALID ((unsigned short)-1) 1424 #define FILTER_PRED_IS_RIGHT (1 << 15) 1425 #define FILTER_PRED_FOLD (1 << 15) 1426 1427 /* 1428 * The max preds is the size of unsigned short with 1429 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1430 * and FOLD flags. The other is reserved. 1431 * 1432 * 2^14 preds is way more than enough. 1433 */ 1434 #define MAX_FILTER_PRED 16384 1435 1436 struct filter_pred; 1437 struct regex; 1438 1439 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1440 1441 enum regex_type { 1442 MATCH_FULL = 0, 1443 MATCH_FRONT_ONLY, 1444 MATCH_MIDDLE_ONLY, 1445 MATCH_END_ONLY, 1446 MATCH_GLOB, 1447 MATCH_INDEX, 1448 }; 1449 1450 struct regex { 1451 char pattern[MAX_FILTER_STR_VAL]; 1452 int len; 1453 int field_len; 1454 regex_match_func match; 1455 }; 1456 1457 static inline bool is_string_field(struct ftrace_event_field *field) 1458 { 1459 return field->filter_type == FILTER_DYN_STRING || 1460 field->filter_type == FILTER_RDYN_STRING || 1461 field->filter_type == FILTER_STATIC_STRING || 1462 field->filter_type == FILTER_PTR_STRING || 1463 field->filter_type == FILTER_COMM; 1464 } 1465 1466 static inline bool is_function_field(struct ftrace_event_field *field) 1467 { 1468 return field->filter_type == FILTER_TRACE_FN; 1469 } 1470 1471 extern enum regex_type 1472 filter_parse_regex(char *buff, int len, char **search, int *not); 1473 extern void print_event_filter(struct trace_event_file *file, 1474 struct trace_seq *s); 1475 extern int apply_event_filter(struct trace_event_file *file, 1476 char *filter_string); 1477 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1478 char *filter_string); 1479 extern void print_subsystem_event_filter(struct event_subsystem *system, 1480 struct trace_seq *s); 1481 extern int filter_assign_type(const char *type); 1482 extern int create_event_filter(struct trace_array *tr, 1483 struct trace_event_call *call, 1484 char *filter_str, bool set_str, 1485 struct event_filter **filterp); 1486 extern void free_event_filter(struct event_filter *filter); 1487 1488 struct ftrace_event_field * 1489 trace_find_event_field(struct trace_event_call *call, char *name); 1490 1491 extern void trace_event_enable_cmd_record(bool enable); 1492 extern void trace_event_enable_tgid_record(bool enable); 1493 1494 extern int event_trace_init(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 extern struct trace_iterator *tracepoint_print_iter; 1946 1947 /* 1948 * Reset the state of the trace_iterator so that it can read consumed data. 1949 * Normally, the trace_iterator is used for reading the data when it is not 1950 * consumed, and must retain state. 1951 */ 1952 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 1953 { 1954 memset_startat(iter, 0, seq); 1955 iter->pos = -1; 1956 } 1957 1958 /* Check the name is good for event/group/fields */ 1959 static inline bool is_good_name(const char *name) 1960 { 1961 if (!isalpha(*name) && *name != '_') 1962 return false; 1963 while (*++name != '\0') { 1964 if (!isalpha(*name) && !isdigit(*name) && *name != '_') 1965 return false; 1966 } 1967 return true; 1968 } 1969 1970 /* Convert certain expected symbols into '_' when generating event names */ 1971 static inline void sanitize_event_name(char *name) 1972 { 1973 while (*name++ != '\0') 1974 if (*name == ':' || *name == '.') 1975 *name = '_'; 1976 } 1977 1978 /* 1979 * This is a generic way to read and write a u64 value from a file in tracefs. 1980 * 1981 * The value is stored on the variable pointed by *val. The value needs 1982 * to be at least *min and at most *max. The write is protected by an 1983 * existing *lock. 1984 */ 1985 struct trace_min_max_param { 1986 struct mutex *lock; 1987 u64 *val; 1988 u64 *min; 1989 u64 *max; 1990 }; 1991 1992 #define U64_STR_SIZE 24 /* 20 digits max */ 1993 1994 extern const struct file_operations trace_min_max_fops; 1995 1996 #ifdef CONFIG_RV 1997 extern int rv_init_interface(void); 1998 #else 1999 static inline int rv_init_interface(void) 2000 { 2001 return 0; 2002 } 2003 #endif 2004 2005 #endif /* _LINUX_KERNEL_TRACE_H */ 2006