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 35enum 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/* 81 * For backward compatibility, older user space expects to see the 82 * kernel_stack event with a fixed size caller field. But today the fix 83 * size is ignored by the kernel, and the real structure is dynamic. 84 * Expose to user space: "unsigned long caller[8];" but the real structure 85 * will be "unsigned long caller[] __counted_by(size)" 86 */ 87#undef __stack_array 88#define __stack_array(type, item, size, field) type item[] __counted_by(field); 89 90#undef __array_desc 91#define __array_desc(type, container, item, size) 92 93#undef __dynamic_array 94#define __dynamic_array(type, item) type item[]; 95 96#undef __rel_dynamic_array 97#define __rel_dynamic_array(type, item) type item[]; 98 99#undef F_STRUCT 100#define F_STRUCT(args...) args 101 102#undef FTRACE_ENTRY 103#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 104 struct struct_name { \ 105 struct trace_entry ent; \ 106 tstruct \ 107 } 108 109#undef FTRACE_ENTRY_DUP 110#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 111 112#undef FTRACE_ENTRY_REG 113#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ 114 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 115 116#undef FTRACE_ENTRY_PACKED 117#define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ 118 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed 119 120#include "trace_entries.h" 121 122/* Use this for memory failure errors */ 123#define MEM_FAIL(condition, fmt, ...) \ 124 DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__) 125 126#define FAULT_STRING "(fault)" 127 128#define HIST_STACKTRACE_DEPTH 16 129#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long)) 130#define HIST_STACKTRACE_SKIP 5 131 132/* 133 * syscalls are special, and need special handling, this is why 134 * they are not included in trace_entries.h 135 */ 136struct syscall_trace_enter { 137 struct trace_entry ent; 138 int nr; 139 unsigned long args[]; 140}; 141 142struct syscall_trace_exit { 143 struct trace_entry ent; 144 int nr; 145 long ret; 146}; 147 148struct kprobe_trace_entry_head { 149 struct trace_entry ent; 150 unsigned long ip; 151}; 152 153struct eprobe_trace_entry_head { 154 struct trace_entry ent; 155}; 156 157struct kretprobe_trace_entry_head { 158 struct trace_entry ent; 159 unsigned long func; 160 unsigned long ret_ip; 161}; 162 163struct fentry_trace_entry_head { 164 struct trace_entry ent; 165 unsigned long ip; 166}; 167 168struct fexit_trace_entry_head { 169 struct trace_entry ent; 170 unsigned long func; 171 unsigned long ret_ip; 172}; 173 174#define TRACE_BUF_SIZE 1024 175 176struct trace_array; 177 178/* 179 * The CPU trace array - it consists of thousands of trace entries 180 * plus some other descriptor data: (for example which task started 181 * the trace, etc.) 182 */ 183struct trace_array_cpu { 184 atomic_t disabled; 185 void *buffer_page; /* ring buffer spare */ 186 187 unsigned long entries; 188 unsigned long saved_latency; 189 unsigned long critical_start; 190 unsigned long critical_end; 191 unsigned long critical_sequence; 192 unsigned long nice; 193 unsigned long policy; 194 unsigned long rt_priority; 195 unsigned long skipped_entries; 196 u64 preempt_timestamp; 197 pid_t pid; 198 kuid_t uid; 199 char comm[TASK_COMM_LEN]; 200 201#ifdef CONFIG_FUNCTION_TRACER 202 int ftrace_ignore_pid; 203#endif 204 bool ignore_pid; 205}; 206 207struct tracer; 208struct trace_option_dentry; 209 210struct array_buffer { 211 struct trace_array *tr; 212 struct trace_buffer *buffer; 213 struct trace_array_cpu __percpu *data; 214 u64 time_start; 215 int cpu; 216}; 217 218#define TRACE_FLAGS_MAX_SIZE 32 219 220struct trace_options { 221 struct tracer *tracer; 222 struct trace_option_dentry *topts; 223}; 224 225struct trace_pid_list *trace_pid_list_alloc(void); 226void trace_pid_list_free(struct trace_pid_list *pid_list); 227bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid); 228int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid); 229int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid); 230int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid); 231int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid, 232 unsigned int *next); 233 234enum { 235 TRACE_PIDS = BIT(0), 236 TRACE_NO_PIDS = BIT(1), 237}; 238 239static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, 240 struct trace_pid_list *no_pid_list) 241{ 242 /* Return true if the pid list in type has pids */ 243 return ((type & TRACE_PIDS) && pid_list) || 244 ((type & TRACE_NO_PIDS) && no_pid_list); 245} 246 247static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, 248 struct trace_pid_list *no_pid_list) 249{ 250 /* 251 * Turning off what is in @type, return true if the "other" 252 * pid list, still has pids in it. 253 */ 254 return (!(type & TRACE_PIDS) && pid_list) || 255 (!(type & TRACE_NO_PIDS) && no_pid_list); 256} 257 258typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 259 260/** 261 * struct cond_snapshot - conditional snapshot data and callback 262 * 263 * The cond_snapshot structure encapsulates a callback function and 264 * data associated with the snapshot for a given tracing instance. 265 * 266 * When a snapshot is taken conditionally, by invoking 267 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 268 * passed in turn to the cond_snapshot.update() function. That data 269 * can be compared by the update() implementation with the cond_data 270 * contained within the struct cond_snapshot instance associated with 271 * the trace_array. Because the tr->max_lock is held throughout the 272 * update() call, the update() function can directly retrieve the 273 * cond_snapshot and cond_data associated with the per-instance 274 * snapshot associated with the trace_array. 275 * 276 * The cond_snapshot.update() implementation can save data to be 277 * associated with the snapshot if it decides to, and returns 'true' 278 * in that case, or it returns 'false' if the conditional snapshot 279 * shouldn't be taken. 280 * 281 * The cond_snapshot instance is created and associated with the 282 * user-defined cond_data by tracing_cond_snapshot_enable(). 283 * Likewise, the cond_snapshot instance is destroyed and is no longer 284 * associated with the trace instance by 285 * tracing_cond_snapshot_disable(). 286 * 287 * The method below is required. 288 * 289 * @update: When a conditional snapshot is invoked, the update() 290 * callback function is invoked with the tr->max_lock held. The 291 * update() implementation signals whether or not to actually 292 * take the snapshot, by returning 'true' if so, 'false' if no 293 * snapshot should be taken. Because the max_lock is held for 294 * the duration of update(), the implementation is safe to 295 * directly retrieved and save any implementation data it needs 296 * to in association with the snapshot. 297 */ 298struct cond_snapshot { 299 void *cond_data; 300 cond_update_fn_t update; 301}; 302 303/* 304 * struct trace_func_repeats - used to keep track of the consecutive 305 * (on the same CPU) calls of a single function. 306 */ 307struct trace_func_repeats { 308 unsigned long ip; 309 unsigned long parent_ip; 310 unsigned long count; 311 u64 ts_last_call; 312}; 313 314/* 315 * The trace array - an array of per-CPU trace arrays. This is the 316 * highest level data structure that individual tracers deal with. 317 * They have on/off state as well: 318 */ 319struct trace_array { 320 struct list_head list; 321 char *name; 322 struct array_buffer array_buffer; 323#ifdef CONFIG_TRACER_MAX_TRACE 324 /* 325 * The max_buffer is used to snapshot the trace when a maximum 326 * latency is reached, or when the user initiates a snapshot. 327 * Some tracers will use this to store a maximum trace while 328 * it continues examining live traces. 329 * 330 * The buffers for the max_buffer are set up the same as the array_buffer 331 * When a snapshot is taken, the buffer of the max_buffer is swapped 332 * with the buffer of the array_buffer and the buffers are reset for 333 * the array_buffer so the tracing can continue. 334 */ 335 struct array_buffer max_buffer; 336 bool allocated_snapshot; 337 spinlock_t snapshot_trigger_lock; 338 unsigned int snapshot; 339 unsigned long max_latency; 340#ifdef CONFIG_FSNOTIFY 341 struct dentry *d_max_latency; 342 struct work_struct fsnotify_work; 343 struct irq_work fsnotify_irqwork; 344#endif 345#endif 346 struct trace_pid_list __rcu *filtered_pids; 347 struct trace_pid_list __rcu *filtered_no_pids; 348 /* 349 * max_lock is used to protect the swapping of buffers 350 * when taking a max snapshot. The buffers themselves are 351 * protected by per_cpu spinlocks. But the action of the swap 352 * needs its own lock. 353 * 354 * This is defined as a arch_spinlock_t in order to help 355 * with performance when lockdep debugging is enabled. 356 * 357 * It is also used in other places outside the update_max_tr 358 * so it needs to be defined outside of the 359 * CONFIG_TRACER_MAX_TRACE. 360 */ 361 arch_spinlock_t max_lock; 362 int buffer_disabled; 363#ifdef CONFIG_FTRACE_SYSCALLS 364 int sys_refcount_enter; 365 int sys_refcount_exit; 366 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 367 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 368#endif 369 int stop_count; 370 int clock_id; 371 int nr_topts; 372 bool clear_trace; 373 int buffer_percent; 374 unsigned int n_err_log_entries; 375 struct tracer *current_trace; 376 unsigned int trace_flags; 377 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 378 unsigned int flags; 379 raw_spinlock_t start_lock; 380 const char *system_names; 381 struct list_head err_log; 382 struct dentry *dir; 383 struct dentry *options; 384 struct dentry *percpu_dir; 385 struct eventfs_inode *event_dir; 386 struct trace_options *topts; 387 struct list_head systems; 388 struct list_head events; 389 struct trace_event_file *trace_marker_file; 390 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 391 /* one per_cpu trace_pipe can be opened by only one user */ 392 cpumask_var_t pipe_cpumask; 393 int ref; 394 int trace_ref; 395#ifdef CONFIG_FUNCTION_TRACER 396 struct ftrace_ops *ops; 397 struct trace_pid_list __rcu *function_pids; 398 struct trace_pid_list __rcu *function_no_pids; 399#ifdef CONFIG_DYNAMIC_FTRACE 400 /* All of these are protected by the ftrace_lock */ 401 struct list_head func_probes; 402 struct list_head mod_trace; 403 struct list_head mod_notrace; 404#endif 405 /* function tracing enabled */ 406 int function_enabled; 407#endif 408 int no_filter_buffering_ref; 409 struct list_head hist_vars; 410#ifdef CONFIG_TRACER_SNAPSHOT 411 struct cond_snapshot *cond_snapshot; 412#endif 413 struct trace_func_repeats __percpu *last_func_repeats; 414 /* 415 * On boot up, the ring buffer is set to the minimum size, so that 416 * we do not waste memory on systems that are not using tracing. 417 */ 418 bool ring_buffer_expanded; 419}; 420 421enum { 422 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 423}; 424 425extern struct list_head ftrace_trace_arrays; 426 427extern struct mutex trace_types_lock; 428 429extern int trace_array_get(struct trace_array *tr); 430extern int tracing_check_open_get_tr(struct trace_array *tr); 431extern struct trace_array *trace_array_find(const char *instance); 432extern struct trace_array *trace_array_find_get(const char *instance); 433 434extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe); 435extern int tracing_set_filter_buffering(struct trace_array *tr, bool set); 436extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 437 438extern bool trace_clock_in_ns(struct trace_array *tr); 439 440/* 441 * The global tracer (top) should be the first trace array added, 442 * but we check the flag anyway. 443 */ 444static inline struct trace_array *top_trace_array(void) 445{ 446 struct trace_array *tr; 447 448 if (list_empty(&ftrace_trace_arrays)) 449 return NULL; 450 451 tr = list_entry(ftrace_trace_arrays.prev, 452 typeof(*tr), list); 453 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 454 return tr; 455} 456 457#define FTRACE_CMP_TYPE(var, type) \ 458 __builtin_types_compatible_p(typeof(var), type *) 459 460#undef IF_ASSIGN 461#define IF_ASSIGN(var, entry, etype, id) \ 462 if (FTRACE_CMP_TYPE(var, etype)) { \ 463 var = (typeof(var))(entry); \ 464 WARN_ON(id != 0 && (entry)->type != id); \ 465 break; \ 466 } 467 468/* Will cause compile errors if type is not found. */ 469extern void __ftrace_bad_type(void); 470 471/* 472 * The trace_assign_type is a verifier that the entry type is 473 * the same as the type being assigned. To add new types simply 474 * add a line with the following format: 475 * 476 * IF_ASSIGN(var, ent, type, id); 477 * 478 * Where "type" is the trace type that includes the trace_entry 479 * as the "ent" item. And "id" is the trace identifier that is 480 * used in the trace_type enum. 481 * 482 * If the type can have more than one id, then use zero. 483 */ 484#define trace_assign_type(var, ent) \ 485 do { \ 486 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 487 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 488 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 489 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 490 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 491 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 492 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 493 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 494 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\ 495 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\ 496 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 497 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 498 TRACE_MMIO_RW); \ 499 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 500 TRACE_MMIO_MAP); \ 501 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 502 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 503 TRACE_GRAPH_ENT); \ 504 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 505 TRACE_GRAPH_RET); \ 506 IF_ASSIGN(var, ent, struct func_repeats_entry, \ 507 TRACE_FUNC_REPEATS); \ 508 __ftrace_bad_type(); \ 509 } while (0) 510 511/* 512 * An option specific to a tracer. This is a boolean value. 513 * The bit is the bit index that sets its value on the 514 * flags value in struct tracer_flags. 515 */ 516struct tracer_opt { 517 const char *name; /* Will appear on the trace_options file */ 518 u32 bit; /* Mask assigned in val field in tracer_flags */ 519}; 520 521/* 522 * The set of specific options for a tracer. Your tracer 523 * have to set the initial value of the flags val. 524 */ 525struct tracer_flags { 526 u32 val; 527 struct tracer_opt *opts; 528 struct tracer *trace; 529}; 530 531/* Makes more easy to define a tracer opt */ 532#define TRACER_OPT(s, b) .name = #s, .bit = b 533 534 535struct trace_option_dentry { 536 struct tracer_opt *opt; 537 struct tracer_flags *flags; 538 struct trace_array *tr; 539 struct dentry *entry; 540}; 541 542/** 543 * struct tracer - a specific tracer and its callbacks to interact with tracefs 544 * @name: the name chosen to select it on the available_tracers file 545 * @init: called when one switches to this tracer (echo name > current_tracer) 546 * @reset: called when one switches to another tracer 547 * @start: called when tracing is unpaused (echo 1 > tracing_on) 548 * @stop: called when tracing is paused (echo 0 > tracing_on) 549 * @update_thresh: called when tracing_thresh is updated 550 * @open: called when the trace file is opened 551 * @pipe_open: called when the trace_pipe file is opened 552 * @close: called when the trace file is released 553 * @pipe_close: called when the trace_pipe file is released 554 * @read: override the default read callback on trace_pipe 555 * @splice_read: override the default splice_read callback on trace_pipe 556 * @selftest: selftest to run on boot (see trace_selftest.c) 557 * @print_headers: override the first lines that describe your columns 558 * @print_line: callback that prints a trace 559 * @set_flag: signals one of your private flags changed (trace_options file) 560 * @flags: your private flags 561 */ 562struct tracer { 563 const char *name; 564 int (*init)(struct trace_array *tr); 565 void (*reset)(struct trace_array *tr); 566 void (*start)(struct trace_array *tr); 567 void (*stop)(struct trace_array *tr); 568 int (*update_thresh)(struct trace_array *tr); 569 void (*open)(struct trace_iterator *iter); 570 void (*pipe_open)(struct trace_iterator *iter); 571 void (*close)(struct trace_iterator *iter); 572 void (*pipe_close)(struct trace_iterator *iter); 573 ssize_t (*read)(struct trace_iterator *iter, 574 struct file *filp, char __user *ubuf, 575 size_t cnt, loff_t *ppos); 576 ssize_t (*splice_read)(struct trace_iterator *iter, 577 struct file *filp, 578 loff_t *ppos, 579 struct pipe_inode_info *pipe, 580 size_t len, 581 unsigned int flags); 582#ifdef CONFIG_FTRACE_STARTUP_TEST 583 int (*selftest)(struct tracer *trace, 584 struct trace_array *tr); 585#endif 586 void (*print_header)(struct seq_file *m); 587 enum print_line_t (*print_line)(struct trace_iterator *iter); 588 /* If you handled the flag setting, return 0 */ 589 int (*set_flag)(struct trace_array *tr, 590 u32 old_flags, u32 bit, int set); 591 /* Return 0 if OK with change, else return non-zero */ 592 int (*flag_changed)(struct trace_array *tr, 593 u32 mask, int set); 594 struct tracer *next; 595 struct tracer_flags *flags; 596 int enabled; 597 bool print_max; 598 bool allow_instances; 599#ifdef CONFIG_TRACER_MAX_TRACE 600 bool use_max_tr; 601#endif 602 /* True if tracer cannot be enabled in kernel param */ 603 bool noboot; 604}; 605 606static inline struct ring_buffer_iter * 607trace_buffer_iter(struct trace_iterator *iter, int cpu) 608{ 609 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 610} 611 612int tracer_init(struct tracer *t, struct trace_array *tr); 613int tracing_is_enabled(void); 614void tracing_reset_online_cpus(struct array_buffer *buf); 615void tracing_reset_all_online_cpus(void); 616void tracing_reset_all_online_cpus_unlocked(void); 617int tracing_open_generic(struct inode *inode, struct file *filp); 618int tracing_open_generic_tr(struct inode *inode, struct file *filp); 619int tracing_release_generic_tr(struct inode *inode, struct file *file); 620int tracing_open_file_tr(struct inode *inode, struct file *filp); 621int tracing_release_file_tr(struct inode *inode, struct file *filp); 622int tracing_single_release_file_tr(struct inode *inode, struct file *filp); 623bool tracing_is_disabled(void); 624bool tracer_tracing_is_on(struct trace_array *tr); 625void tracer_tracing_on(struct trace_array *tr); 626void tracer_tracing_off(struct trace_array *tr); 627struct dentry *trace_create_file(const char *name, 628 umode_t mode, 629 struct dentry *parent, 630 void *data, 631 const struct file_operations *fops); 632 633int tracing_init_dentry(void); 634 635struct ring_buffer_event; 636 637struct ring_buffer_event * 638trace_buffer_lock_reserve(struct trace_buffer *buffer, 639 int type, 640 unsigned long len, 641 unsigned int trace_ctx); 642 643struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 644 struct trace_array_cpu *data); 645 646struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 647 int *ent_cpu, u64 *ent_ts); 648 649void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, 650 struct ring_buffer_event *event); 651 652bool trace_is_tracepoint_string(const char *str); 653const char *trace_event_format(struct trace_iterator *iter, const char *fmt); 654void trace_check_vprintf(struct trace_iterator *iter, const char *fmt, 655 va_list ap) __printf(2, 0); 656char *trace_iter_expand_format(struct trace_iterator *iter); 657 658int trace_empty(struct trace_iterator *iter); 659 660void *trace_find_next_entry_inc(struct trace_iterator *iter); 661 662void trace_init_global_iter(struct trace_iterator *iter); 663 664void tracing_iter_reset(struct trace_iterator *iter, int cpu); 665 666unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 667unsigned long trace_total_entries(struct trace_array *tr); 668 669void trace_function(struct trace_array *tr, 670 unsigned long ip, 671 unsigned long parent_ip, 672 unsigned int trace_ctx); 673void trace_graph_function(struct trace_array *tr, 674 unsigned long ip, 675 unsigned long parent_ip, 676 unsigned int trace_ctx); 677void trace_latency_header(struct seq_file *m); 678void trace_default_header(struct seq_file *m); 679void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 680 681void trace_graph_return(struct ftrace_graph_ret *trace); 682int trace_graph_entry(struct ftrace_graph_ent *trace); 683void set_graph_array(struct trace_array *tr); 684 685void tracing_start_cmdline_record(void); 686void tracing_stop_cmdline_record(void); 687void tracing_start_tgid_record(void); 688void tracing_stop_tgid_record(void); 689 690int register_tracer(struct tracer *type); 691int is_tracing_stopped(void); 692 693loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 694 695extern cpumask_var_t __read_mostly tracing_buffer_mask; 696 697#define for_each_tracing_cpu(cpu) \ 698 for_each_cpu(cpu, tracing_buffer_mask) 699 700extern unsigned long nsecs_to_usecs(unsigned long nsecs); 701 702extern unsigned long tracing_thresh; 703 704/* PID filtering */ 705 706extern int pid_max; 707 708bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 709 pid_t search_pid); 710bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 711 struct trace_pid_list *filtered_no_pids, 712 struct task_struct *task); 713void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 714 struct task_struct *self, 715 struct task_struct *task); 716void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 717void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 718int trace_pid_show(struct seq_file *m, void *v); 719int trace_pid_write(struct trace_pid_list *filtered_pids, 720 struct trace_pid_list **new_pid_list, 721 const char __user *ubuf, size_t cnt); 722 723#ifdef CONFIG_TRACER_MAX_TRACE 724void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 725 void *cond_data); 726void update_max_tr_single(struct trace_array *tr, 727 struct task_struct *tsk, int cpu); 728 729#ifdef CONFIG_FSNOTIFY 730#define LATENCY_FS_NOTIFY 731#endif 732#endif /* CONFIG_TRACER_MAX_TRACE */ 733 734#ifdef LATENCY_FS_NOTIFY 735void latency_fsnotify(struct trace_array *tr); 736#else 737static inline void latency_fsnotify(struct trace_array *tr) { } 738#endif 739 740#ifdef CONFIG_STACKTRACE 741void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip); 742#else 743static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, 744 int skip) 745{ 746} 747#endif /* CONFIG_STACKTRACE */ 748 749void trace_last_func_repeats(struct trace_array *tr, 750 struct trace_func_repeats *last_info, 751 unsigned int trace_ctx); 752 753extern u64 ftrace_now(int cpu); 754 755extern void trace_find_cmdline(int pid, char comm[]); 756extern int trace_find_tgid(int pid); 757extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 758 759#ifdef CONFIG_DYNAMIC_FTRACE 760extern unsigned long ftrace_update_tot_cnt; 761extern unsigned long ftrace_number_of_pages; 762extern unsigned long ftrace_number_of_groups; 763void ftrace_init_trace_array(struct trace_array *tr); 764#else 765static inline void ftrace_init_trace_array(struct trace_array *tr) { } 766#endif 767#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 768extern int DYN_FTRACE_TEST_NAME(void); 769#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 770extern int DYN_FTRACE_TEST_NAME2(void); 771 772extern void trace_set_ring_buffer_expanded(struct trace_array *tr); 773extern bool tracing_selftest_disabled; 774 775#ifdef CONFIG_FTRACE_STARTUP_TEST 776extern void __init disable_tracing_selftest(const char *reason); 777 778extern int trace_selftest_startup_function(struct tracer *trace, 779 struct trace_array *tr); 780extern int trace_selftest_startup_function_graph(struct tracer *trace, 781 struct trace_array *tr); 782extern int trace_selftest_startup_irqsoff(struct tracer *trace, 783 struct trace_array *tr); 784extern int trace_selftest_startup_preemptoff(struct tracer *trace, 785 struct trace_array *tr); 786extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 787 struct trace_array *tr); 788extern int trace_selftest_startup_wakeup(struct tracer *trace, 789 struct trace_array *tr); 790extern int trace_selftest_startup_nop(struct tracer *trace, 791 struct trace_array *tr); 792extern int trace_selftest_startup_branch(struct tracer *trace, 793 struct trace_array *tr); 794/* 795 * Tracer data references selftest functions that only occur 796 * on boot up. These can be __init functions. Thus, when selftests 797 * are enabled, then the tracers need to reference __init functions. 798 */ 799#define __tracer_data __refdata 800#else 801static inline void __init disable_tracing_selftest(const char *reason) 802{ 803} 804/* Tracers are seldom changed. Optimize when selftests are disabled. */ 805#define __tracer_data __read_mostly 806#endif /* CONFIG_FTRACE_STARTUP_TEST */ 807 808extern void *head_page(struct trace_array_cpu *data); 809extern unsigned long long ns2usecs(u64 nsec); 810extern int 811trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 812extern int 813trace_vprintk(unsigned long ip, const char *fmt, va_list args); 814extern int 815trace_array_vprintk(struct trace_array *tr, 816 unsigned long ip, const char *fmt, va_list args); 817int trace_array_printk_buf(struct trace_buffer *buffer, 818 unsigned long ip, const char *fmt, ...); 819void trace_printk_seq(struct trace_seq *s); 820enum print_line_t print_trace_line(struct trace_iterator *iter); 821 822extern char trace_find_mark(unsigned long long duration); 823 824struct ftrace_hash; 825 826struct ftrace_mod_load { 827 struct list_head list; 828 char *func; 829 char *module; 830 int enable; 831}; 832 833enum { 834 FTRACE_HASH_FL_MOD = (1 << 0), 835}; 836 837struct ftrace_hash { 838 unsigned long size_bits; 839 struct hlist_head *buckets; 840 unsigned long count; 841 unsigned long flags; 842 struct rcu_head rcu; 843}; 844 845struct ftrace_func_entry * 846ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 847 848static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 849{ 850 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 851} 852 853/* Standard output formatting function used for function return traces */ 854#ifdef CONFIG_FUNCTION_GRAPH_TRACER 855 856/* Flag options */ 857#define TRACE_GRAPH_PRINT_OVERRUN 0x1 858#define TRACE_GRAPH_PRINT_CPU 0x2 859#define TRACE_GRAPH_PRINT_OVERHEAD 0x4 860#define TRACE_GRAPH_PRINT_PROC 0x8 861#define TRACE_GRAPH_PRINT_DURATION 0x10 862#define TRACE_GRAPH_PRINT_ABS_TIME 0x20 863#define TRACE_GRAPH_PRINT_REL_TIME 0x40 864#define TRACE_GRAPH_PRINT_IRQS 0x80 865#define TRACE_GRAPH_PRINT_TAIL 0x100 866#define TRACE_GRAPH_SLEEP_TIME 0x200 867#define TRACE_GRAPH_GRAPH_TIME 0x400 868#define TRACE_GRAPH_PRINT_RETVAL 0x800 869#define TRACE_GRAPH_PRINT_RETVAL_HEX 0x1000 870#define TRACE_GRAPH_PRINT_FILL_SHIFT 28 871#define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 872 873extern void ftrace_graph_sleep_time_control(bool enable); 874 875#ifdef CONFIG_FUNCTION_PROFILER 876extern void ftrace_graph_graph_time_control(bool enable); 877#else 878static inline void ftrace_graph_graph_time_control(bool enable) { } 879#endif 880 881extern enum print_line_t 882print_graph_function_flags(struct trace_iterator *iter, u32 flags); 883extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 884extern void 885trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 886extern void graph_trace_open(struct trace_iterator *iter); 887extern void graph_trace_close(struct trace_iterator *iter); 888extern int __trace_graph_entry(struct trace_array *tr, 889 struct ftrace_graph_ent *trace, 890 unsigned int trace_ctx); 891extern void __trace_graph_return(struct trace_array *tr, 892 struct ftrace_graph_ret *trace, 893 unsigned int trace_ctx); 894 895#ifdef CONFIG_DYNAMIC_FTRACE 896extern struct ftrace_hash __rcu *ftrace_graph_hash; 897extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; 898 899static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 900{ 901 unsigned long addr = trace->func; 902 int ret = 0; 903 struct ftrace_hash *hash; 904 905 preempt_disable_notrace(); 906 907 /* 908 * Have to open code "rcu_dereference_sched()" because the 909 * function graph tracer can be called when RCU is not 910 * "watching". 911 * Protected with schedule_on_each_cpu(ftrace_sync) 912 */ 913 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); 914 915 if (ftrace_hash_empty(hash)) { 916 ret = 1; 917 goto out; 918 } 919 920 if (ftrace_lookup_ip(hash, addr)) { 921 922 /* 923 * This needs to be cleared on the return functions 924 * when the depth is zero. 925 */ 926 trace_recursion_set(TRACE_GRAPH_BIT); 927 trace_recursion_set_depth(trace->depth); 928 929 /* 930 * If no irqs are to be traced, but a set_graph_function 931 * is set, and called by an interrupt handler, we still 932 * want to trace it. 933 */ 934 if (in_hardirq()) 935 trace_recursion_set(TRACE_IRQ_BIT); 936 else 937 trace_recursion_clear(TRACE_IRQ_BIT); 938 ret = 1; 939 } 940 941out: 942 preempt_enable_notrace(); 943 return ret; 944} 945 946static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 947{ 948 if (trace_recursion_test(TRACE_GRAPH_BIT) && 949 trace->depth == trace_recursion_depth()) 950 trace_recursion_clear(TRACE_GRAPH_BIT); 951} 952 953static inline int ftrace_graph_notrace_addr(unsigned long addr) 954{ 955 int ret = 0; 956 struct ftrace_hash *notrace_hash; 957 958 preempt_disable_notrace(); 959 960 /* 961 * Have to open code "rcu_dereference_sched()" because the 962 * function graph tracer can be called when RCU is not 963 * "watching". 964 * Protected with schedule_on_each_cpu(ftrace_sync) 965 */ 966 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, 967 !preemptible()); 968 969 if (ftrace_lookup_ip(notrace_hash, addr)) 970 ret = 1; 971 972 preempt_enable_notrace(); 973 return ret; 974} 975#else 976static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 977{ 978 return 1; 979} 980 981static inline int ftrace_graph_notrace_addr(unsigned long addr) 982{ 983 return 0; 984} 985static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 986{ } 987#endif /* CONFIG_DYNAMIC_FTRACE */ 988 989extern unsigned int fgraph_max_depth; 990 991static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 992{ 993 /* trace it when it is-nested-in or is a function enabled. */ 994 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 995 ftrace_graph_addr(trace)) || 996 (trace->depth < 0) || 997 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 998} 999 1000#else /* CONFIG_FUNCTION_GRAPH_TRACER */ 1001static inline enum print_line_t 1002print_graph_function_flags(struct trace_iterator *iter, u32 flags) 1003{ 1004 return TRACE_TYPE_UNHANDLED; 1005} 1006#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 1007 1008extern struct list_head ftrace_pids; 1009 1010#ifdef CONFIG_FUNCTION_TRACER 1011 1012#define FTRACE_PID_IGNORE -1 1013#define FTRACE_PID_TRACE -2 1014 1015struct ftrace_func_command { 1016 struct list_head list; 1017 char *name; 1018 int (*func)(struct trace_array *tr, 1019 struct ftrace_hash *hash, 1020 char *func, char *cmd, 1021 char *params, int enable); 1022}; 1023extern bool ftrace_filter_param __initdata; 1024static inline int ftrace_trace_task(struct trace_array *tr) 1025{ 1026 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) != 1027 FTRACE_PID_IGNORE; 1028} 1029extern int ftrace_is_dead(void); 1030int ftrace_create_function_files(struct trace_array *tr, 1031 struct dentry *parent); 1032void ftrace_destroy_function_files(struct trace_array *tr); 1033int ftrace_allocate_ftrace_ops(struct trace_array *tr); 1034void ftrace_free_ftrace_ops(struct trace_array *tr); 1035void ftrace_init_global_array_ops(struct trace_array *tr); 1036void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 1037void ftrace_reset_array_ops(struct trace_array *tr); 1038void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 1039void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1040 struct dentry *d_tracer); 1041void ftrace_clear_pids(struct trace_array *tr); 1042int init_function_trace(void); 1043void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1044#else 1045static inline int ftrace_trace_task(struct trace_array *tr) 1046{ 1047 return 1; 1048} 1049static inline int ftrace_is_dead(void) { return 0; } 1050static inline int 1051ftrace_create_function_files(struct trace_array *tr, 1052 struct dentry *parent) 1053{ 1054 return 0; 1055} 1056static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) 1057{ 1058 return 0; 1059} 1060static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } 1061static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1062static inline __init void 1063ftrace_init_global_array_ops(struct trace_array *tr) { } 1064static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1065static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1066static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1067static inline void ftrace_clear_pids(struct trace_array *tr) { } 1068static inline int init_function_trace(void) { return 0; } 1069static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1070/* ftace_func_t type is not defined, use macro instead of static inline */ 1071#define ftrace_init_array_ops(tr, func) do { } while (0) 1072#endif /* CONFIG_FUNCTION_TRACER */ 1073 1074#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1075 1076struct ftrace_probe_ops { 1077 void (*func)(unsigned long ip, 1078 unsigned long parent_ip, 1079 struct trace_array *tr, 1080 struct ftrace_probe_ops *ops, 1081 void *data); 1082 int (*init)(struct ftrace_probe_ops *ops, 1083 struct trace_array *tr, 1084 unsigned long ip, void *init_data, 1085 void **data); 1086 void (*free)(struct ftrace_probe_ops *ops, 1087 struct trace_array *tr, 1088 unsigned long ip, void *data); 1089 int (*print)(struct seq_file *m, 1090 unsigned long ip, 1091 struct ftrace_probe_ops *ops, 1092 void *data); 1093}; 1094 1095struct ftrace_func_mapper; 1096typedef int (*ftrace_mapper_func)(void *data); 1097 1098struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1099void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1100 unsigned long ip); 1101int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1102 unsigned long ip, void *data); 1103void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1104 unsigned long ip); 1105void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1106 ftrace_mapper_func free_func); 1107 1108extern int 1109register_ftrace_function_probe(char *glob, struct trace_array *tr, 1110 struct ftrace_probe_ops *ops, void *data); 1111extern int 1112unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1113 struct ftrace_probe_ops *ops); 1114extern void clear_ftrace_function_probes(struct trace_array *tr); 1115 1116int register_ftrace_command(struct ftrace_func_command *cmd); 1117int unregister_ftrace_command(struct ftrace_func_command *cmd); 1118 1119void ftrace_create_filter_files(struct ftrace_ops *ops, 1120 struct dentry *parent); 1121void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1122 1123extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, 1124 int len, int reset); 1125extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, 1126 int len, int reset); 1127#else 1128struct ftrace_func_command; 1129 1130static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1131{ 1132 return -EINVAL; 1133} 1134static inline __init int unregister_ftrace_command(char *cmd_name) 1135{ 1136 return -EINVAL; 1137} 1138static inline void clear_ftrace_function_probes(struct trace_array *tr) 1139{ 1140} 1141 1142/* 1143 * The ops parameter passed in is usually undefined. 1144 * This must be a macro. 1145 */ 1146#define ftrace_create_filter_files(ops, parent) do { } while (0) 1147#define ftrace_destroy_filter_files(ops) do { } while (0) 1148#endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1149 1150bool ftrace_event_is_function(struct trace_event_call *call); 1151 1152/* 1153 * struct trace_parser - servers for reading the user input separated by spaces 1154 * @cont: set if the input is not complete - no final space char was found 1155 * @buffer: holds the parsed user input 1156 * @idx: user input length 1157 * @size: buffer size 1158 */ 1159struct trace_parser { 1160 bool cont; 1161 char *buffer; 1162 unsigned idx; 1163 unsigned size; 1164}; 1165 1166static inline bool trace_parser_loaded(struct trace_parser *parser) 1167{ 1168 return (parser->idx != 0); 1169} 1170 1171static inline bool trace_parser_cont(struct trace_parser *parser) 1172{ 1173 return parser->cont; 1174} 1175 1176static inline void trace_parser_clear(struct trace_parser *parser) 1177{ 1178 parser->cont = false; 1179 parser->idx = 0; 1180} 1181 1182extern int trace_parser_get_init(struct trace_parser *parser, int size); 1183extern void trace_parser_put(struct trace_parser *parser); 1184extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1185 size_t cnt, loff_t *ppos); 1186 1187/* 1188 * Only create function graph options if function graph is configured. 1189 */ 1190#ifdef CONFIG_FUNCTION_GRAPH_TRACER 1191# define FGRAPH_FLAGS \ 1192 C(DISPLAY_GRAPH, "display-graph"), 1193#else 1194# define FGRAPH_FLAGS 1195#endif 1196 1197#ifdef CONFIG_BRANCH_TRACER 1198# define BRANCH_FLAGS \ 1199 C(BRANCH, "branch"), 1200#else 1201# define BRANCH_FLAGS 1202#endif 1203 1204#ifdef CONFIG_FUNCTION_TRACER 1205# define FUNCTION_FLAGS \ 1206 C(FUNCTION, "function-trace"), \ 1207 C(FUNC_FORK, "function-fork"), 1208# define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1209#else 1210# define FUNCTION_FLAGS 1211# define FUNCTION_DEFAULT_FLAGS 0UL 1212# define TRACE_ITER_FUNC_FORK 0UL 1213#endif 1214 1215#ifdef CONFIG_STACKTRACE 1216# define STACK_FLAGS \ 1217 C(STACKTRACE, "stacktrace"), 1218#else 1219# define STACK_FLAGS 1220#endif 1221 1222/* 1223 * trace_iterator_flags is an enumeration that defines bit 1224 * positions into trace_flags that controls the output. 1225 * 1226 * NOTE: These bits must match the trace_options array in 1227 * trace.c (this macro guarantees it). 1228 */ 1229#define TRACE_FLAGS \ 1230 C(PRINT_PARENT, "print-parent"), \ 1231 C(SYM_OFFSET, "sym-offset"), \ 1232 C(SYM_ADDR, "sym-addr"), \ 1233 C(VERBOSE, "verbose"), \ 1234 C(RAW, "raw"), \ 1235 C(HEX, "hex"), \ 1236 C(BIN, "bin"), \ 1237 C(BLOCK, "block"), \ 1238 C(FIELDS, "fields"), \ 1239 C(PRINTK, "trace_printk"), \ 1240 C(ANNOTATE, "annotate"), \ 1241 C(USERSTACKTRACE, "userstacktrace"), \ 1242 C(SYM_USEROBJ, "sym-userobj"), \ 1243 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1244 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1245 C(LATENCY_FMT, "latency-format"), \ 1246 C(RECORD_CMD, "record-cmd"), \ 1247 C(RECORD_TGID, "record-tgid"), \ 1248 C(OVERWRITE, "overwrite"), \ 1249 C(STOP_ON_FREE, "disable_on_free"), \ 1250 C(IRQ_INFO, "irq-info"), \ 1251 C(MARKERS, "markers"), \ 1252 C(EVENT_FORK, "event-fork"), \ 1253 C(PAUSE_ON_TRACE, "pause-on-trace"), \ 1254 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \ 1255 FUNCTION_FLAGS \ 1256 FGRAPH_FLAGS \ 1257 STACK_FLAGS \ 1258 BRANCH_FLAGS 1259 1260/* 1261 * By defining C, we can make TRACE_FLAGS a list of bit names 1262 * that will define the bits for the flag masks. 1263 */ 1264#undef C 1265#define C(a, b) TRACE_ITER_##a##_BIT 1266 1267enum trace_iterator_bits { 1268 TRACE_FLAGS 1269 /* Make sure we don't go more than we have bits for */ 1270 TRACE_ITER_LAST_BIT 1271}; 1272 1273/* 1274 * By redefining C, we can make TRACE_FLAGS a list of masks that 1275 * use the bits as defined above. 1276 */ 1277#undef C 1278#define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1279 1280enum trace_iterator_flags { TRACE_FLAGS }; 1281 1282/* 1283 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1284 * control the output of kernel symbols. 1285 */ 1286#define TRACE_ITER_SYM_MASK \ 1287 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1288 1289extern struct tracer nop_trace; 1290 1291#ifdef CONFIG_BRANCH_TRACER 1292extern int enable_branch_tracing(struct trace_array *tr); 1293extern void disable_branch_tracing(void); 1294static inline int trace_branch_enable(struct trace_array *tr) 1295{ 1296 if (tr->trace_flags & TRACE_ITER_BRANCH) 1297 return enable_branch_tracing(tr); 1298 return 0; 1299} 1300static inline void trace_branch_disable(void) 1301{ 1302 /* due to races, always disable */ 1303 disable_branch_tracing(); 1304} 1305#else 1306static inline int trace_branch_enable(struct trace_array *tr) 1307{ 1308 return 0; 1309} 1310static inline void trace_branch_disable(void) 1311{ 1312} 1313#endif /* CONFIG_BRANCH_TRACER */ 1314 1315/* set ring buffers to default size if not already done so */ 1316int tracing_update_buffers(struct trace_array *tr); 1317 1318union trace_synth_field { 1319 u8 as_u8; 1320 u16 as_u16; 1321 u32 as_u32; 1322 u64 as_u64; 1323 struct trace_dynamic_info as_dynamic; 1324}; 1325 1326struct ftrace_event_field { 1327 struct list_head link; 1328 const char *name; 1329 const char *type; 1330 int filter_type; 1331 int offset; 1332 int size; 1333 int is_signed; 1334 int len; 1335}; 1336 1337struct prog_entry; 1338 1339struct event_filter { 1340 struct prog_entry __rcu *prog; 1341 char *filter_string; 1342}; 1343 1344struct event_subsystem { 1345 struct list_head list; 1346 const char *name; 1347 struct event_filter *filter; 1348 int ref_count; 1349}; 1350 1351struct trace_subsystem_dir { 1352 struct list_head list; 1353 struct event_subsystem *subsystem; 1354 struct trace_array *tr; 1355 struct eventfs_inode *ei; 1356 int ref_count; 1357 int nr_events; 1358}; 1359 1360extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1361 struct trace_buffer *buffer, 1362 struct ring_buffer_event *event); 1363 1364void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1365 struct trace_buffer *buffer, 1366 struct ring_buffer_event *event, 1367 unsigned int trcace_ctx, 1368 struct pt_regs *regs); 1369 1370static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1371 struct trace_buffer *buffer, 1372 struct ring_buffer_event *event, 1373 unsigned int trace_ctx) 1374{ 1375 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL); 1376} 1377 1378DECLARE_PER_CPU(bool, trace_taskinfo_save); 1379int trace_save_cmdline(struct task_struct *tsk); 1380int trace_create_savedcmd(void); 1381int trace_alloc_tgid_map(void); 1382void trace_free_saved_cmdlines_buffer(void); 1383 1384extern const struct file_operations tracing_saved_cmdlines_fops; 1385extern const struct file_operations tracing_saved_tgids_fops; 1386extern const struct file_operations tracing_saved_cmdlines_size_fops; 1387 1388DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1389DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1390void trace_buffered_event_disable(void); 1391void trace_buffered_event_enable(void); 1392 1393void early_enable_events(struct trace_array *tr, char *buf, bool disable_first); 1394 1395static inline void 1396__trace_event_discard_commit(struct trace_buffer *buffer, 1397 struct ring_buffer_event *event) 1398{ 1399 if (this_cpu_read(trace_buffered_event) == event) { 1400 /* Simply release the temp buffer and enable preemption */ 1401 this_cpu_dec(trace_buffered_event_cnt); 1402 preempt_enable_notrace(); 1403 return; 1404 } 1405 /* ring_buffer_discard_commit() enables preemption */ 1406 ring_buffer_discard_commit(buffer, event); 1407} 1408 1409/* 1410 * Helper function for event_trigger_unlock_commit{_regs}(). 1411 * If there are event triggers attached to this event that requires 1412 * filtering against its fields, then they will be called as the 1413 * entry already holds the field information of the current event. 1414 * 1415 * It also checks if the event should be discarded or not. 1416 * It is to be discarded if the event is soft disabled and the 1417 * event was only recorded to process triggers, or if the event 1418 * filter is active and this event did not match the filters. 1419 * 1420 * Returns true if the event is discarded, false otherwise. 1421 */ 1422static inline bool 1423__event_trigger_test_discard(struct trace_event_file *file, 1424 struct trace_buffer *buffer, 1425 struct ring_buffer_event *event, 1426 void *entry, 1427 enum event_trigger_type *tt) 1428{ 1429 unsigned long eflags = file->flags; 1430 1431 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1432 *tt = event_triggers_call(file, buffer, entry, event); 1433 1434 if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED | 1435 EVENT_FILE_FL_FILTERED | 1436 EVENT_FILE_FL_PID_FILTER)))) 1437 return false; 1438 1439 if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) 1440 goto discard; 1441 1442 if (file->flags & EVENT_FILE_FL_FILTERED && 1443 !filter_match_preds(file->filter, entry)) 1444 goto discard; 1445 1446 if ((file->flags & EVENT_FILE_FL_PID_FILTER) && 1447 trace_event_ignore_this_pid(file)) 1448 goto discard; 1449 1450 return false; 1451 discard: 1452 __trace_event_discard_commit(buffer, event); 1453 return true; 1454} 1455 1456/** 1457 * event_trigger_unlock_commit - handle triggers and finish event commit 1458 * @file: The file pointer associated with the event 1459 * @buffer: The ring buffer that the event is being written to 1460 * @event: The event meta data in the ring buffer 1461 * @entry: The event itself 1462 * @trace_ctx: The tracing context flags. 1463 * 1464 * This is a helper function to handle triggers that require data 1465 * from the event itself. It also tests the event against filters and 1466 * if the event is soft disabled and should be discarded. 1467 */ 1468static inline void 1469event_trigger_unlock_commit(struct trace_event_file *file, 1470 struct trace_buffer *buffer, 1471 struct ring_buffer_event *event, 1472 void *entry, unsigned int trace_ctx) 1473{ 1474 enum event_trigger_type tt = ETT_NONE; 1475 1476 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1477 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx); 1478 1479 if (tt) 1480 event_triggers_post_call(file, tt); 1481} 1482 1483#define FILTER_PRED_INVALID ((unsigned short)-1) 1484#define FILTER_PRED_IS_RIGHT (1 << 15) 1485#define FILTER_PRED_FOLD (1 << 15) 1486 1487/* 1488 * The max preds is the size of unsigned short with 1489 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1490 * and FOLD flags. The other is reserved. 1491 * 1492 * 2^14 preds is way more than enough. 1493 */ 1494#define MAX_FILTER_PRED 16384 1495 1496struct filter_pred; 1497struct regex; 1498 1499typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1500 1501enum regex_type { 1502 MATCH_FULL = 0, 1503 MATCH_FRONT_ONLY, 1504 MATCH_MIDDLE_ONLY, 1505 MATCH_END_ONLY, 1506 MATCH_GLOB, 1507 MATCH_INDEX, 1508}; 1509 1510struct regex { 1511 char pattern[MAX_FILTER_STR_VAL]; 1512 int len; 1513 int field_len; 1514 regex_match_func match; 1515}; 1516 1517static inline bool is_string_field(struct ftrace_event_field *field) 1518{ 1519 return field->filter_type == FILTER_DYN_STRING || 1520 field->filter_type == FILTER_RDYN_STRING || 1521 field->filter_type == FILTER_STATIC_STRING || 1522 field->filter_type == FILTER_PTR_STRING || 1523 field->filter_type == FILTER_COMM; 1524} 1525 1526static inline bool is_function_field(struct ftrace_event_field *field) 1527{ 1528 return field->filter_type == FILTER_TRACE_FN; 1529} 1530 1531extern enum regex_type 1532filter_parse_regex(char *buff, int len, char **search, int *not); 1533extern void print_event_filter(struct trace_event_file *file, 1534 struct trace_seq *s); 1535extern int apply_event_filter(struct trace_event_file *file, 1536 char *filter_string); 1537extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1538 char *filter_string); 1539extern void print_subsystem_event_filter(struct event_subsystem *system, 1540 struct trace_seq *s); 1541extern int filter_assign_type(const char *type); 1542extern int create_event_filter(struct trace_array *tr, 1543 struct trace_event_call *call, 1544 char *filter_str, bool set_str, 1545 struct event_filter **filterp); 1546extern void free_event_filter(struct event_filter *filter); 1547 1548struct ftrace_event_field * 1549trace_find_event_field(struct trace_event_call *call, char *name); 1550 1551extern void trace_event_enable_cmd_record(bool enable); 1552extern void trace_event_enable_tgid_record(bool enable); 1553 1554extern int event_trace_init(void); 1555extern int init_events(void); 1556extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1557extern int event_trace_del_tracer(struct trace_array *tr); 1558extern void __trace_early_add_events(struct trace_array *tr); 1559 1560extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1561 const char *system, 1562 const char *event); 1563extern struct trace_event_file *find_event_file(struct trace_array *tr, 1564 const char *system, 1565 const char *event); 1566 1567static inline void *event_file_data(struct file *filp) 1568{ 1569 return READ_ONCE(file_inode(filp)->i_private); 1570} 1571 1572extern struct mutex event_mutex; 1573extern struct list_head ftrace_events; 1574 1575extern const struct file_operations event_trigger_fops; 1576extern const struct file_operations event_hist_fops; 1577extern const struct file_operations event_hist_debug_fops; 1578extern const struct file_operations event_inject_fops; 1579 1580#ifdef CONFIG_HIST_TRIGGERS 1581extern int register_trigger_hist_cmd(void); 1582extern int register_trigger_hist_enable_disable_cmds(void); 1583#else 1584static inline int register_trigger_hist_cmd(void) { return 0; } 1585static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1586#endif 1587 1588extern int register_trigger_cmds(void); 1589extern void clear_event_triggers(struct trace_array *tr); 1590 1591enum { 1592 EVENT_TRIGGER_FL_PROBE = BIT(0), 1593}; 1594 1595struct event_trigger_data { 1596 unsigned long count; 1597 int ref; 1598 int flags; 1599 struct event_trigger_ops *ops; 1600 struct event_command *cmd_ops; 1601 struct event_filter __rcu *filter; 1602 char *filter_str; 1603 void *private_data; 1604 bool paused; 1605 bool paused_tmp; 1606 struct list_head list; 1607 char *name; 1608 struct list_head named_list; 1609 struct event_trigger_data *named_data; 1610}; 1611 1612/* Avoid typos */ 1613#define ENABLE_EVENT_STR "enable_event" 1614#define DISABLE_EVENT_STR "disable_event" 1615#define ENABLE_HIST_STR "enable_hist" 1616#define DISABLE_HIST_STR "disable_hist" 1617 1618struct enable_trigger_data { 1619 struct trace_event_file *file; 1620 bool enable; 1621 bool hist; 1622}; 1623 1624extern int event_enable_trigger_print(struct seq_file *m, 1625 struct event_trigger_data *data); 1626extern void event_enable_trigger_free(struct event_trigger_data *data); 1627extern int event_enable_trigger_parse(struct event_command *cmd_ops, 1628 struct trace_event_file *file, 1629 char *glob, char *cmd, 1630 char *param_and_filter); 1631extern int event_enable_register_trigger(char *glob, 1632 struct event_trigger_data *data, 1633 struct trace_event_file *file); 1634extern void event_enable_unregister_trigger(char *glob, 1635 struct event_trigger_data *test, 1636 struct trace_event_file *file); 1637extern void trigger_data_free(struct event_trigger_data *data); 1638extern int event_trigger_init(struct event_trigger_data *data); 1639extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1640 int trigger_enable); 1641extern void update_cond_flag(struct trace_event_file *file); 1642extern int set_trigger_filter(char *filter_str, 1643 struct event_trigger_data *trigger_data, 1644 struct trace_event_file *file); 1645extern struct event_trigger_data *find_named_trigger(const char *name); 1646extern bool is_named_trigger(struct event_trigger_data *test); 1647extern int save_named_trigger(const char *name, 1648 struct event_trigger_data *data); 1649extern void del_named_trigger(struct event_trigger_data *data); 1650extern void pause_named_trigger(struct event_trigger_data *data); 1651extern void unpause_named_trigger(struct event_trigger_data *data); 1652extern void set_named_trigger_data(struct event_trigger_data *data, 1653 struct event_trigger_data *named_data); 1654extern struct event_trigger_data * 1655get_named_trigger_data(struct event_trigger_data *data); 1656extern int register_event_command(struct event_command *cmd); 1657extern int unregister_event_command(struct event_command *cmd); 1658extern int register_trigger_hist_enable_disable_cmds(void); 1659extern bool event_trigger_check_remove(const char *glob); 1660extern bool event_trigger_empty_param(const char *param); 1661extern int event_trigger_separate_filter(char *param_and_filter, char **param, 1662 char **filter, bool param_required); 1663extern struct event_trigger_data * 1664event_trigger_alloc(struct event_command *cmd_ops, 1665 char *cmd, 1666 char *param, 1667 void *private_data); 1668extern int event_trigger_parse_num(char *trigger, 1669 struct event_trigger_data *trigger_data); 1670extern int event_trigger_set_filter(struct event_command *cmd_ops, 1671 struct trace_event_file *file, 1672 char *param, 1673 struct event_trigger_data *trigger_data); 1674extern void event_trigger_reset_filter(struct event_command *cmd_ops, 1675 struct event_trigger_data *trigger_data); 1676extern int event_trigger_register(struct event_command *cmd_ops, 1677 struct trace_event_file *file, 1678 char *glob, 1679 struct event_trigger_data *trigger_data); 1680extern void event_trigger_unregister(struct event_command *cmd_ops, 1681 struct trace_event_file *file, 1682 char *glob, 1683 struct event_trigger_data *trigger_data); 1684 1685extern void event_file_get(struct trace_event_file *file); 1686extern void event_file_put(struct trace_event_file *file); 1687 1688/** 1689 * struct event_trigger_ops - callbacks for trace event triggers 1690 * 1691 * The methods in this structure provide per-event trigger hooks for 1692 * various trigger operations. 1693 * 1694 * The @init and @free methods are used during trigger setup and 1695 * teardown, typically called from an event_command's @parse() 1696 * function implementation. 1697 * 1698 * The @print method is used to print the trigger spec. 1699 * 1700 * The @trigger method is the function that actually implements the 1701 * trigger and is called in the context of the triggering event 1702 * whenever that event occurs. 1703 * 1704 * All the methods below, except for @init() and @free(), must be 1705 * implemented. 1706 * 1707 * @trigger: The trigger 'probe' function called when the triggering 1708 * event occurs. The data passed into this callback is the data 1709 * that was supplied to the event_command @reg() function that 1710 * registered the trigger (see struct event_command) along with 1711 * the trace record, rec. 1712 * 1713 * @init: An optional initialization function called for the trigger 1714 * when the trigger is registered (via the event_command reg() 1715 * function). This can be used to perform per-trigger 1716 * initialization such as incrementing a per-trigger reference 1717 * count, for instance. This is usually implemented by the 1718 * generic utility function @event_trigger_init() (see 1719 * trace_event_triggers.c). 1720 * 1721 * @free: An optional de-initialization function called for the 1722 * trigger when the trigger is unregistered (via the 1723 * event_command @reg() function). This can be used to perform 1724 * per-trigger de-initialization such as decrementing a 1725 * per-trigger reference count and freeing corresponding trigger 1726 * data, for instance. This is usually implemented by the 1727 * generic utility function @event_trigger_free() (see 1728 * trace_event_triggers.c). 1729 * 1730 * @print: The callback function invoked to have the trigger print 1731 * itself. This is usually implemented by a wrapper function 1732 * that calls the generic utility function @event_trigger_print() 1733 * (see trace_event_triggers.c). 1734 */ 1735struct event_trigger_ops { 1736 void (*trigger)(struct event_trigger_data *data, 1737 struct trace_buffer *buffer, 1738 void *rec, 1739 struct ring_buffer_event *rbe); 1740 int (*init)(struct event_trigger_data *data); 1741 void (*free)(struct event_trigger_data *data); 1742 int (*print)(struct seq_file *m, 1743 struct event_trigger_data *data); 1744}; 1745 1746/** 1747 * struct event_command - callbacks and data members for event commands 1748 * 1749 * Event commands are invoked by users by writing the command name 1750 * into the 'trigger' file associated with a trace event. The 1751 * parameters associated with a specific invocation of an event 1752 * command are used to create an event trigger instance, which is 1753 * added to the list of trigger instances associated with that trace 1754 * event. When the event is hit, the set of triggers associated with 1755 * that event is invoked. 1756 * 1757 * The data members in this structure provide per-event command data 1758 * for various event commands. 1759 * 1760 * All the data members below, except for @post_trigger, must be set 1761 * for each event command. 1762 * 1763 * @name: The unique name that identifies the event command. This is 1764 * the name used when setting triggers via trigger files. 1765 * 1766 * @trigger_type: A unique id that identifies the event command 1767 * 'type'. This value has two purposes, the first to ensure that 1768 * only one trigger of the same type can be set at a given time 1769 * for a particular event e.g. it doesn't make sense to have both 1770 * a traceon and traceoff trigger attached to a single event at 1771 * the same time, so traceon and traceoff have the same type 1772 * though they have different names. The @trigger_type value is 1773 * also used as a bit value for deferring the actual trigger 1774 * action until after the current event is finished. Some 1775 * commands need to do this if they themselves log to the trace 1776 * buffer (see the @post_trigger() member below). @trigger_type 1777 * values are defined by adding new values to the trigger_type 1778 * enum in include/linux/trace_events.h. 1779 * 1780 * @flags: See the enum event_command_flags below. 1781 * 1782 * All the methods below, except for @set_filter() and @unreg_all(), 1783 * must be implemented. 1784 * 1785 * @parse: The callback function responsible for parsing and 1786 * registering the trigger written to the 'trigger' file by the 1787 * user. It allocates the trigger instance and registers it with 1788 * the appropriate trace event. It makes use of the other 1789 * event_command callback functions to orchestrate this, and is 1790 * usually implemented by the generic utility function 1791 * @event_trigger_callback() (see trace_event_triggers.c). 1792 * 1793 * @reg: Adds the trigger to the list of triggers associated with the 1794 * event, and enables the event trigger itself, after 1795 * initializing it (via the event_trigger_ops @init() function). 1796 * This is also where commands can use the @trigger_type value to 1797 * make the decision as to whether or not multiple instances of 1798 * the trigger should be allowed. This is usually implemented by 1799 * the generic utility function @register_trigger() (see 1800 * trace_event_triggers.c). 1801 * 1802 * @unreg: Removes the trigger from the list of triggers associated 1803 * with the event, and disables the event trigger itself, after 1804 * initializing it (via the event_trigger_ops @free() function). 1805 * This is usually implemented by the generic utility function 1806 * @unregister_trigger() (see trace_event_triggers.c). 1807 * 1808 * @unreg_all: An optional function called to remove all the triggers 1809 * from the list of triggers associated with the event. Called 1810 * when a trigger file is opened in truncate mode. 1811 * 1812 * @set_filter: An optional function called to parse and set a filter 1813 * for the trigger. If no @set_filter() method is set for the 1814 * event command, filters set by the user for the command will be 1815 * ignored. This is usually implemented by the generic utility 1816 * function @set_trigger_filter() (see trace_event_triggers.c). 1817 * 1818 * @get_trigger_ops: The callback function invoked to retrieve the 1819 * event_trigger_ops implementation associated with the command. 1820 * This callback function allows a single event_command to 1821 * support multiple trigger implementations via different sets of 1822 * event_trigger_ops, depending on the value of the @param 1823 * string. 1824 */ 1825struct event_command { 1826 struct list_head list; 1827 char *name; 1828 enum event_trigger_type trigger_type; 1829 int flags; 1830 int (*parse)(struct event_command *cmd_ops, 1831 struct trace_event_file *file, 1832 char *glob, char *cmd, 1833 char *param_and_filter); 1834 int (*reg)(char *glob, 1835 struct event_trigger_data *data, 1836 struct trace_event_file *file); 1837 void (*unreg)(char *glob, 1838 struct event_trigger_data *data, 1839 struct trace_event_file *file); 1840 void (*unreg_all)(struct trace_event_file *file); 1841 int (*set_filter)(char *filter_str, 1842 struct event_trigger_data *data, 1843 struct trace_event_file *file); 1844 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1845}; 1846 1847/** 1848 * enum event_command_flags - flags for struct event_command 1849 * 1850 * @POST_TRIGGER: A flag that says whether or not this command needs 1851 * to have its action delayed until after the current event has 1852 * been closed. Some triggers need to avoid being invoked while 1853 * an event is currently in the process of being logged, since 1854 * the trigger may itself log data into the trace buffer. Thus 1855 * we make sure the current event is committed before invoking 1856 * those triggers. To do that, the trigger invocation is split 1857 * in two - the first part checks the filter using the current 1858 * trace record; if a command has the @post_trigger flag set, it 1859 * sets a bit for itself in the return value, otherwise it 1860 * directly invokes the trigger. Once all commands have been 1861 * either invoked or set their return flag, the current record is 1862 * either committed or discarded. At that point, if any commands 1863 * have deferred their triggers, those commands are finally 1864 * invoked following the close of the current event. In other 1865 * words, if the event_trigger_ops @func() probe implementation 1866 * itself logs to the trace buffer, this flag should be set, 1867 * otherwise it can be left unspecified. 1868 * 1869 * @NEEDS_REC: A flag that says whether or not this command needs 1870 * access to the trace record in order to perform its function, 1871 * regardless of whether or not it has a filter associated with 1872 * it (filters make a trigger require access to the trace record 1873 * but are not always present). 1874 */ 1875enum event_command_flags { 1876 EVENT_CMD_FL_POST_TRIGGER = 1, 1877 EVENT_CMD_FL_NEEDS_REC = 2, 1878}; 1879 1880static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1881{ 1882 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1883} 1884 1885static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1886{ 1887 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1888} 1889 1890extern int trace_event_enable_disable(struct trace_event_file *file, 1891 int enable, int soft_disable); 1892extern int tracing_alloc_snapshot(void); 1893extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1894extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1895 1896extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1897extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1898 1899extern const char *__start___trace_bprintk_fmt[]; 1900extern const char *__stop___trace_bprintk_fmt[]; 1901 1902extern const char *__start___tracepoint_str[]; 1903extern const char *__stop___tracepoint_str[]; 1904 1905void trace_printk_control(bool enabled); 1906void trace_printk_start_comm(void); 1907int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1908int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1909 1910/* Used from boot time tracer */ 1911extern int trace_set_options(struct trace_array *tr, char *option); 1912extern int tracing_set_tracer(struct trace_array *tr, const char *buf); 1913extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr, 1914 unsigned long size, int cpu_id); 1915extern int tracing_set_cpumask(struct trace_array *tr, 1916 cpumask_var_t tracing_cpumask_new); 1917 1918 1919#define MAX_EVENT_NAME_LEN 64 1920 1921extern ssize_t trace_parse_run_command(struct file *file, 1922 const char __user *buffer, size_t count, loff_t *ppos, 1923 int (*createfn)(const char *)); 1924 1925extern unsigned int err_pos(char *cmd, const char *str); 1926extern void tracing_log_err(struct trace_array *tr, 1927 const char *loc, const char *cmd, 1928 const char **errs, u8 type, u16 pos); 1929 1930/* 1931 * Normal trace_printk() and friends allocates special buffers 1932 * to do the manipulation, as well as saves the print formats 1933 * into sections to display. But the trace infrastructure wants 1934 * to use these without the added overhead at the price of being 1935 * a bit slower (used mainly for warnings, where we don't care 1936 * about performance). The internal_trace_puts() is for such 1937 * a purpose. 1938 */ 1939#define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1940 1941#undef FTRACE_ENTRY 1942#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 1943 extern struct trace_event_call \ 1944 __aligned(4) event_##call; 1945#undef FTRACE_ENTRY_DUP 1946#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 1947 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1948#undef FTRACE_ENTRY_PACKED 1949#define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \ 1950 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1951 1952#include "trace_entries.h" 1953 1954#if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1955int perf_ftrace_event_register(struct trace_event_call *call, 1956 enum trace_reg type, void *data); 1957#else 1958#define perf_ftrace_event_register NULL 1959#endif 1960 1961#ifdef CONFIG_FTRACE_SYSCALLS 1962void init_ftrace_syscalls(void); 1963const char *get_syscall_name(int syscall); 1964#else 1965static inline void init_ftrace_syscalls(void) { } 1966static inline const char *get_syscall_name(int syscall) 1967{ 1968 return NULL; 1969} 1970#endif 1971 1972#ifdef CONFIG_EVENT_TRACING 1973void trace_event_init(void); 1974void trace_event_eval_update(struct trace_eval_map **map, int len); 1975/* Used from boot time tracer */ 1976extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); 1977extern int trigger_process_regex(struct trace_event_file *file, char *buff); 1978#else 1979static inline void __init trace_event_init(void) { } 1980static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1981#endif 1982 1983#ifdef CONFIG_TRACER_SNAPSHOT 1984void tracing_snapshot_instance(struct trace_array *tr); 1985int tracing_alloc_snapshot_instance(struct trace_array *tr); 1986int tracing_arm_snapshot(struct trace_array *tr); 1987void tracing_disarm_snapshot(struct trace_array *tr); 1988#else 1989static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1990static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1991{ 1992 return 0; 1993} 1994static inline int tracing_arm_snapshot(struct trace_array *tr) { return 0; } 1995static inline void tracing_disarm_snapshot(struct trace_array *tr) { } 1996#endif 1997 1998#ifdef CONFIG_PREEMPT_TRACER 1999void tracer_preempt_on(unsigned long a0, unsigned long a1); 2000void tracer_preempt_off(unsigned long a0, unsigned long a1); 2001#else 2002static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 2003static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 2004#endif 2005#ifdef CONFIG_IRQSOFF_TRACER 2006void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 2007void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 2008#else 2009static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 2010static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 2011#endif 2012 2013/* 2014 * Reset the state of the trace_iterator so that it can read consumed data. 2015 * Normally, the trace_iterator is used for reading the data when it is not 2016 * consumed, and must retain state. 2017 */ 2018static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 2019{ 2020 memset_startat(iter, 0, seq); 2021 iter->pos = -1; 2022} 2023 2024/* Check the name is good for event/group/fields */ 2025static inline bool __is_good_name(const char *name, bool hash_ok) 2026{ 2027 if (!isalpha(*name) && *name != '_' && (!hash_ok || *name != '-')) 2028 return false; 2029 while (*++name != '\0') { 2030 if (!isalpha(*name) && !isdigit(*name) && *name != '_' && 2031 (!hash_ok || *name != '-')) 2032 return false; 2033 } 2034 return true; 2035} 2036 2037/* Check the name is good for event/group/fields */ 2038static inline bool is_good_name(const char *name) 2039{ 2040 return __is_good_name(name, false); 2041} 2042 2043/* Check the name is good for system */ 2044static inline bool is_good_system_name(const char *name) 2045{ 2046 return __is_good_name(name, true); 2047} 2048 2049/* Convert certain expected symbols into '_' when generating event names */ 2050static inline void sanitize_event_name(char *name) 2051{ 2052 while (*name++ != '\0') 2053 if (*name == ':' || *name == '.') 2054 *name = '_'; 2055} 2056 2057/* 2058 * This is a generic way to read and write a u64 value from a file in tracefs. 2059 * 2060 * The value is stored on the variable pointed by *val. The value needs 2061 * to be at least *min and at most *max. The write is protected by an 2062 * existing *lock. 2063 */ 2064struct trace_min_max_param { 2065 struct mutex *lock; 2066 u64 *val; 2067 u64 *min; 2068 u64 *max; 2069}; 2070 2071#define U64_STR_SIZE 24 /* 20 digits max */ 2072 2073extern const struct file_operations trace_min_max_fops; 2074 2075#ifdef CONFIG_RV 2076extern int rv_init_interface(void); 2077#else 2078static inline int rv_init_interface(void) 2079{ 2080 return 0; 2081} 2082#endif 2083 2084#endif /* _LINUX_KERNEL_TRACE_H */ 2085