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