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 24 #ifdef CONFIG_FTRACE_SYSCALLS 25 #include <asm/unistd.h> /* For NR_SYSCALLS */ 26 #include <asm/syscall.h> /* some archs define it here */ 27 #endif 28 29 enum trace_type { 30 __TRACE_FIRST_TYPE = 0, 31 32 TRACE_FN, 33 TRACE_CTX, 34 TRACE_WAKE, 35 TRACE_STACK, 36 TRACE_PRINT, 37 TRACE_BPRINT, 38 TRACE_MMIO_RW, 39 TRACE_MMIO_MAP, 40 TRACE_BRANCH, 41 TRACE_GRAPH_RET, 42 TRACE_GRAPH_ENT, 43 TRACE_USER_STACK, 44 TRACE_BLK, 45 TRACE_BPUTS, 46 TRACE_HWLAT, 47 TRACE_RAW_DATA, 48 49 __TRACE_LAST_TYPE, 50 }; 51 52 53 #undef __field 54 #define __field(type, item) type item; 55 56 #undef __field_fn 57 #define __field_fn(type, item) type item; 58 59 #undef __field_struct 60 #define __field_struct(type, item) __field(type, item) 61 62 #undef __field_desc 63 #define __field_desc(type, container, item) 64 65 #undef __field_packed 66 #define __field_packed(type, container, item) 67 68 #undef __array 69 #define __array(type, item, size) type item[size]; 70 71 #undef __array_desc 72 #define __array_desc(type, container, item, size) 73 74 #undef __dynamic_array 75 #define __dynamic_array(type, item) type item[]; 76 77 #undef F_STRUCT 78 #define F_STRUCT(args...) args 79 80 #undef FTRACE_ENTRY 81 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 82 struct struct_name { \ 83 struct trace_entry ent; \ 84 tstruct \ 85 } 86 87 #undef FTRACE_ENTRY_DUP 88 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 89 90 #undef FTRACE_ENTRY_REG 91 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ 92 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 93 94 #undef FTRACE_ENTRY_PACKED 95 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ 96 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed 97 98 #include "trace_entries.h" 99 100 /* Use this for memory failure errors */ 101 #define MEM_FAIL(condition, fmt, ...) ({ \ 102 static bool __section(".data.once") __warned; \ 103 int __ret_warn_once = !!(condition); \ 104 \ 105 if (unlikely(__ret_warn_once && !__warned)) { \ 106 __warned = true; \ 107 pr_err("ERROR: " fmt, ##__VA_ARGS__); \ 108 } \ 109 unlikely(__ret_warn_once); \ 110 }) 111 112 /* 113 * syscalls are special, and need special handling, this is why 114 * they are not included in trace_entries.h 115 */ 116 struct syscall_trace_enter { 117 struct trace_entry ent; 118 int nr; 119 unsigned long args[]; 120 }; 121 122 struct syscall_trace_exit { 123 struct trace_entry ent; 124 int nr; 125 long ret; 126 }; 127 128 struct kprobe_trace_entry_head { 129 struct trace_entry ent; 130 unsigned long ip; 131 }; 132 133 struct kretprobe_trace_entry_head { 134 struct trace_entry ent; 135 unsigned long func; 136 unsigned long ret_ip; 137 }; 138 139 #define TRACE_BUF_SIZE 1024 140 141 struct trace_array; 142 143 /* 144 * The CPU trace array - it consists of thousands of trace entries 145 * plus some other descriptor data: (for example which task started 146 * the trace, etc.) 147 */ 148 struct trace_array_cpu { 149 atomic_t disabled; 150 void *buffer_page; /* ring buffer spare */ 151 152 unsigned long entries; 153 unsigned long saved_latency; 154 unsigned long critical_start; 155 unsigned long critical_end; 156 unsigned long critical_sequence; 157 unsigned long nice; 158 unsigned long policy; 159 unsigned long rt_priority; 160 unsigned long skipped_entries; 161 u64 preempt_timestamp; 162 pid_t pid; 163 kuid_t uid; 164 char comm[TASK_COMM_LEN]; 165 166 #ifdef CONFIG_FUNCTION_TRACER 167 int ftrace_ignore_pid; 168 #endif 169 bool ignore_pid; 170 }; 171 172 struct tracer; 173 struct trace_option_dentry; 174 175 struct array_buffer { 176 struct trace_array *tr; 177 struct trace_buffer *buffer; 178 struct trace_array_cpu __percpu *data; 179 u64 time_start; 180 int cpu; 181 }; 182 183 #define TRACE_FLAGS_MAX_SIZE 32 184 185 struct trace_options { 186 struct tracer *tracer; 187 struct trace_option_dentry *topts; 188 }; 189 190 struct trace_pid_list { 191 int pid_max; 192 unsigned long *pids; 193 }; 194 195 enum { 196 TRACE_PIDS = BIT(0), 197 TRACE_NO_PIDS = BIT(1), 198 }; 199 200 static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, 201 struct trace_pid_list *no_pid_list) 202 { 203 /* Return true if the pid list in type has pids */ 204 return ((type & TRACE_PIDS) && pid_list) || 205 ((type & TRACE_NO_PIDS) && no_pid_list); 206 } 207 208 static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, 209 struct trace_pid_list *no_pid_list) 210 { 211 /* 212 * Turning off what is in @type, return true if the "other" 213 * pid list, still has pids in it. 214 */ 215 return (!(type & TRACE_PIDS) && pid_list) || 216 (!(type & TRACE_NO_PIDS) && no_pid_list); 217 } 218 219 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 220 221 /** 222 * struct cond_snapshot - conditional snapshot data and callback 223 * 224 * The cond_snapshot structure encapsulates a callback function and 225 * data associated with the snapshot for a given tracing instance. 226 * 227 * When a snapshot is taken conditionally, by invoking 228 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 229 * passed in turn to the cond_snapshot.update() function. That data 230 * can be compared by the update() implementation with the cond_data 231 * contained within the struct cond_snapshot instance associated with 232 * the trace_array. Because the tr->max_lock is held throughout the 233 * update() call, the update() function can directly retrieve the 234 * cond_snapshot and cond_data associated with the per-instance 235 * snapshot associated with the trace_array. 236 * 237 * The cond_snapshot.update() implementation can save data to be 238 * associated with the snapshot if it decides to, and returns 'true' 239 * in that case, or it returns 'false' if the conditional snapshot 240 * shouldn't be taken. 241 * 242 * The cond_snapshot instance is created and associated with the 243 * user-defined cond_data by tracing_cond_snapshot_enable(). 244 * Likewise, the cond_snapshot instance is destroyed and is no longer 245 * associated with the trace instance by 246 * tracing_cond_snapshot_disable(). 247 * 248 * The method below is required. 249 * 250 * @update: When a conditional snapshot is invoked, the update() 251 * callback function is invoked with the tr->max_lock held. The 252 * update() implementation signals whether or not to actually 253 * take the snapshot, by returning 'true' if so, 'false' if no 254 * snapshot should be taken. Because the max_lock is held for 255 * the duration of update(), the implementation is safe to 256 * directly retrieved and save any implementation data it needs 257 * to in association with the snapshot. 258 */ 259 struct cond_snapshot { 260 void *cond_data; 261 cond_update_fn_t update; 262 }; 263 264 /* 265 * The trace array - an array of per-CPU trace arrays. This is the 266 * highest level data structure that individual tracers deal with. 267 * They have on/off state as well: 268 */ 269 struct trace_array { 270 struct list_head list; 271 char *name; 272 struct array_buffer array_buffer; 273 #ifdef CONFIG_TRACER_MAX_TRACE 274 /* 275 * The max_buffer is used to snapshot the trace when a maximum 276 * latency is reached, or when the user initiates a snapshot. 277 * Some tracers will use this to store a maximum trace while 278 * it continues examining live traces. 279 * 280 * The buffers for the max_buffer are set up the same as the array_buffer 281 * When a snapshot is taken, the buffer of the max_buffer is swapped 282 * with the buffer of the array_buffer and the buffers are reset for 283 * the array_buffer so the tracing can continue. 284 */ 285 struct array_buffer max_buffer; 286 bool allocated_snapshot; 287 #endif 288 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) 289 unsigned long max_latency; 290 #ifdef CONFIG_FSNOTIFY 291 struct dentry *d_max_latency; 292 struct work_struct fsnotify_work; 293 struct irq_work fsnotify_irqwork; 294 #endif 295 #endif 296 struct trace_pid_list __rcu *filtered_pids; 297 struct trace_pid_list __rcu *filtered_no_pids; 298 /* 299 * max_lock is used to protect the swapping of buffers 300 * when taking a max snapshot. The buffers themselves are 301 * protected by per_cpu spinlocks. But the action of the swap 302 * needs its own lock. 303 * 304 * This is defined as a arch_spinlock_t in order to help 305 * with performance when lockdep debugging is enabled. 306 * 307 * It is also used in other places outside the update_max_tr 308 * so it needs to be defined outside of the 309 * CONFIG_TRACER_MAX_TRACE. 310 */ 311 arch_spinlock_t max_lock; 312 int buffer_disabled; 313 #ifdef CONFIG_FTRACE_SYSCALLS 314 int sys_refcount_enter; 315 int sys_refcount_exit; 316 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 317 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 318 #endif 319 int stop_count; 320 int clock_id; 321 int nr_topts; 322 bool clear_trace; 323 int buffer_percent; 324 unsigned int n_err_log_entries; 325 struct tracer *current_trace; 326 unsigned int trace_flags; 327 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 328 unsigned int flags; 329 raw_spinlock_t start_lock; 330 struct list_head err_log; 331 struct dentry *dir; 332 struct dentry *options; 333 struct dentry *percpu_dir; 334 struct dentry *event_dir; 335 struct trace_options *topts; 336 struct list_head systems; 337 struct list_head events; 338 struct trace_event_file *trace_marker_file; 339 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 340 int ref; 341 int trace_ref; 342 #ifdef CONFIG_FUNCTION_TRACER 343 struct ftrace_ops *ops; 344 struct trace_pid_list __rcu *function_pids; 345 struct trace_pid_list __rcu *function_no_pids; 346 #ifdef CONFIG_DYNAMIC_FTRACE 347 /* All of these are protected by the ftrace_lock */ 348 struct list_head func_probes; 349 struct list_head mod_trace; 350 struct list_head mod_notrace; 351 #endif 352 /* function tracing enabled */ 353 int function_enabled; 354 #endif 355 int time_stamp_abs_ref; 356 struct list_head hist_vars; 357 #ifdef CONFIG_TRACER_SNAPSHOT 358 struct cond_snapshot *cond_snapshot; 359 #endif 360 }; 361 362 enum { 363 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 364 }; 365 366 extern struct list_head ftrace_trace_arrays; 367 368 extern struct mutex trace_types_lock; 369 370 extern int trace_array_get(struct trace_array *tr); 371 extern int tracing_check_open_get_tr(struct trace_array *tr); 372 extern struct trace_array *trace_array_find(const char *instance); 373 extern struct trace_array *trace_array_find_get(const char *instance); 374 375 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs); 376 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 377 378 extern bool trace_clock_in_ns(struct trace_array *tr); 379 380 /* 381 * The global tracer (top) should be the first trace array added, 382 * but we check the flag anyway. 383 */ 384 static inline struct trace_array *top_trace_array(void) 385 { 386 struct trace_array *tr; 387 388 if (list_empty(&ftrace_trace_arrays)) 389 return NULL; 390 391 tr = list_entry(ftrace_trace_arrays.prev, 392 typeof(*tr), list); 393 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 394 return tr; 395 } 396 397 #define FTRACE_CMP_TYPE(var, type) \ 398 __builtin_types_compatible_p(typeof(var), type *) 399 400 #undef IF_ASSIGN 401 #define IF_ASSIGN(var, entry, etype, id) \ 402 if (FTRACE_CMP_TYPE(var, etype)) { \ 403 var = (typeof(var))(entry); \ 404 WARN_ON(id != 0 && (entry)->type != id); \ 405 break; \ 406 } 407 408 /* Will cause compile errors if type is not found. */ 409 extern void __ftrace_bad_type(void); 410 411 /* 412 * The trace_assign_type is a verifier that the entry type is 413 * the same as the type being assigned. To add new types simply 414 * add a line with the following format: 415 * 416 * IF_ASSIGN(var, ent, type, id); 417 * 418 * Where "type" is the trace type that includes the trace_entry 419 * as the "ent" item. And "id" is the trace identifier that is 420 * used in the trace_type enum. 421 * 422 * If the type can have more than one id, then use zero. 423 */ 424 #define trace_assign_type(var, ent) \ 425 do { \ 426 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 427 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 428 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 429 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 430 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 431 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 432 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 433 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 434 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 435 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 436 TRACE_MMIO_RW); \ 437 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 438 TRACE_MMIO_MAP); \ 439 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 440 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 441 TRACE_GRAPH_ENT); \ 442 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 443 TRACE_GRAPH_RET); \ 444 __ftrace_bad_type(); \ 445 } while (0) 446 447 /* 448 * An option specific to a tracer. This is a boolean value. 449 * The bit is the bit index that sets its value on the 450 * flags value in struct tracer_flags. 451 */ 452 struct tracer_opt { 453 const char *name; /* Will appear on the trace_options file */ 454 u32 bit; /* Mask assigned in val field in tracer_flags */ 455 }; 456 457 /* 458 * The set of specific options for a tracer. Your tracer 459 * have to set the initial value of the flags val. 460 */ 461 struct tracer_flags { 462 u32 val; 463 struct tracer_opt *opts; 464 struct tracer *trace; 465 }; 466 467 /* Makes more easy to define a tracer opt */ 468 #define TRACER_OPT(s, b) .name = #s, .bit = b 469 470 471 struct trace_option_dentry { 472 struct tracer_opt *opt; 473 struct tracer_flags *flags; 474 struct trace_array *tr; 475 struct dentry *entry; 476 }; 477 478 /** 479 * struct tracer - a specific tracer and its callbacks to interact with tracefs 480 * @name: the name chosen to select it on the available_tracers file 481 * @init: called when one switches to this tracer (echo name > current_tracer) 482 * @reset: called when one switches to another tracer 483 * @start: called when tracing is unpaused (echo 1 > tracing_on) 484 * @stop: called when tracing is paused (echo 0 > tracing_on) 485 * @update_thresh: called when tracing_thresh is updated 486 * @open: called when the trace file is opened 487 * @pipe_open: called when the trace_pipe file is opened 488 * @close: called when the trace file is released 489 * @pipe_close: called when the trace_pipe file is released 490 * @read: override the default read callback on trace_pipe 491 * @splice_read: override the default splice_read callback on trace_pipe 492 * @selftest: selftest to run on boot (see trace_selftest.c) 493 * @print_headers: override the first lines that describe your columns 494 * @print_line: callback that prints a trace 495 * @set_flag: signals one of your private flags changed (trace_options file) 496 * @flags: your private flags 497 */ 498 struct tracer { 499 const char *name; 500 int (*init)(struct trace_array *tr); 501 void (*reset)(struct trace_array *tr); 502 void (*start)(struct trace_array *tr); 503 void (*stop)(struct trace_array *tr); 504 int (*update_thresh)(struct trace_array *tr); 505 void (*open)(struct trace_iterator *iter); 506 void (*pipe_open)(struct trace_iterator *iter); 507 void (*close)(struct trace_iterator *iter); 508 void (*pipe_close)(struct trace_iterator *iter); 509 ssize_t (*read)(struct trace_iterator *iter, 510 struct file *filp, char __user *ubuf, 511 size_t cnt, loff_t *ppos); 512 ssize_t (*splice_read)(struct trace_iterator *iter, 513 struct file *filp, 514 loff_t *ppos, 515 struct pipe_inode_info *pipe, 516 size_t len, 517 unsigned int flags); 518 #ifdef CONFIG_FTRACE_STARTUP_TEST 519 int (*selftest)(struct tracer *trace, 520 struct trace_array *tr); 521 #endif 522 void (*print_header)(struct seq_file *m); 523 enum print_line_t (*print_line)(struct trace_iterator *iter); 524 /* If you handled the flag setting, return 0 */ 525 int (*set_flag)(struct trace_array *tr, 526 u32 old_flags, u32 bit, int set); 527 /* Return 0 if OK with change, else return non-zero */ 528 int (*flag_changed)(struct trace_array *tr, 529 u32 mask, int set); 530 struct tracer *next; 531 struct tracer_flags *flags; 532 int enabled; 533 bool print_max; 534 bool allow_instances; 535 #ifdef CONFIG_TRACER_MAX_TRACE 536 bool use_max_tr; 537 #endif 538 /* True if tracer cannot be enabled in kernel param */ 539 bool noboot; 540 }; 541 542 static inline struct ring_buffer_iter * 543 trace_buffer_iter(struct trace_iterator *iter, int cpu) 544 { 545 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 546 } 547 548 int tracer_init(struct tracer *t, struct trace_array *tr); 549 int tracing_is_enabled(void); 550 void tracing_reset_online_cpus(struct array_buffer *buf); 551 void tracing_reset_current(int cpu); 552 void tracing_reset_all_online_cpus(void); 553 int tracing_open_generic(struct inode *inode, struct file *filp); 554 int tracing_open_generic_tr(struct inode *inode, struct file *filp); 555 bool tracing_is_disabled(void); 556 bool tracer_tracing_is_on(struct trace_array *tr); 557 void tracer_tracing_on(struct trace_array *tr); 558 void tracer_tracing_off(struct trace_array *tr); 559 struct dentry *trace_create_file(const char *name, 560 umode_t mode, 561 struct dentry *parent, 562 void *data, 563 const struct file_operations *fops); 564 565 int tracing_init_dentry(void); 566 567 struct ring_buffer_event; 568 569 struct ring_buffer_event * 570 trace_buffer_lock_reserve(struct trace_buffer *buffer, 571 int type, 572 unsigned long len, 573 unsigned int trace_ctx); 574 575 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 576 struct trace_array_cpu *data); 577 578 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 579 int *ent_cpu, u64 *ent_ts); 580 581 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, 582 struct ring_buffer_event *event); 583 584 int trace_empty(struct trace_iterator *iter); 585 586 void *trace_find_next_entry_inc(struct trace_iterator *iter); 587 588 void trace_init_global_iter(struct trace_iterator *iter); 589 590 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 591 592 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 593 unsigned long trace_total_entries(struct trace_array *tr); 594 595 void trace_function(struct trace_array *tr, 596 unsigned long ip, 597 unsigned long parent_ip, 598 unsigned int trace_ctx); 599 void trace_graph_function(struct trace_array *tr, 600 unsigned long ip, 601 unsigned long parent_ip, 602 unsigned int trace_ctx); 603 void trace_latency_header(struct seq_file *m); 604 void trace_default_header(struct seq_file *m); 605 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 606 int trace_empty(struct trace_iterator *iter); 607 608 void trace_graph_return(struct ftrace_graph_ret *trace); 609 int trace_graph_entry(struct ftrace_graph_ent *trace); 610 void set_graph_array(struct trace_array *tr); 611 612 void tracing_start_cmdline_record(void); 613 void tracing_stop_cmdline_record(void); 614 void tracing_start_tgid_record(void); 615 void tracing_stop_tgid_record(void); 616 617 int register_tracer(struct tracer *type); 618 int is_tracing_stopped(void); 619 620 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 621 622 extern cpumask_var_t __read_mostly tracing_buffer_mask; 623 624 #define for_each_tracing_cpu(cpu) \ 625 for_each_cpu(cpu, tracing_buffer_mask) 626 627 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 628 629 extern unsigned long tracing_thresh; 630 631 /* PID filtering */ 632 633 extern int pid_max; 634 635 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 636 pid_t search_pid); 637 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 638 struct trace_pid_list *filtered_no_pids, 639 struct task_struct *task); 640 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 641 struct task_struct *self, 642 struct task_struct *task); 643 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 644 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 645 int trace_pid_show(struct seq_file *m, void *v); 646 void trace_free_pid_list(struct trace_pid_list *pid_list); 647 int trace_pid_write(struct trace_pid_list *filtered_pids, 648 struct trace_pid_list **new_pid_list, 649 const char __user *ubuf, size_t cnt); 650 651 #ifdef CONFIG_TRACER_MAX_TRACE 652 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 653 void *cond_data); 654 void update_max_tr_single(struct trace_array *tr, 655 struct task_struct *tsk, int cpu); 656 #endif /* CONFIG_TRACER_MAX_TRACE */ 657 658 #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ 659 defined(CONFIG_FSNOTIFY) 660 661 void latency_fsnotify(struct trace_array *tr); 662 663 #else 664 665 static inline void latency_fsnotify(struct trace_array *tr) { } 666 667 #endif 668 669 #ifdef CONFIG_STACKTRACE 670 void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip); 671 #else 672 static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, 673 int skip) 674 { 675 } 676 #endif /* CONFIG_STACKTRACE */ 677 678 extern u64 ftrace_now(int cpu); 679 680 extern void trace_find_cmdline(int pid, char comm[]); 681 extern int trace_find_tgid(int pid); 682 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 683 684 #ifdef CONFIG_DYNAMIC_FTRACE 685 extern unsigned long ftrace_update_tot_cnt; 686 extern unsigned long ftrace_number_of_pages; 687 extern unsigned long ftrace_number_of_groups; 688 void ftrace_init_trace_array(struct trace_array *tr); 689 #else 690 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 691 #endif 692 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 693 extern int DYN_FTRACE_TEST_NAME(void); 694 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 695 extern int DYN_FTRACE_TEST_NAME2(void); 696 697 extern bool ring_buffer_expanded; 698 extern bool tracing_selftest_disabled; 699 700 #ifdef CONFIG_FTRACE_STARTUP_TEST 701 extern void __init disable_tracing_selftest(const char *reason); 702 703 extern int trace_selftest_startup_function(struct tracer *trace, 704 struct trace_array *tr); 705 extern int trace_selftest_startup_function_graph(struct tracer *trace, 706 struct trace_array *tr); 707 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 708 struct trace_array *tr); 709 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 710 struct trace_array *tr); 711 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 712 struct trace_array *tr); 713 extern int trace_selftest_startup_wakeup(struct tracer *trace, 714 struct trace_array *tr); 715 extern int trace_selftest_startup_nop(struct tracer *trace, 716 struct trace_array *tr); 717 extern int trace_selftest_startup_branch(struct tracer *trace, 718 struct trace_array *tr); 719 /* 720 * Tracer data references selftest functions that only occur 721 * on boot up. These can be __init functions. Thus, when selftests 722 * are enabled, then the tracers need to reference __init functions. 723 */ 724 #define __tracer_data __refdata 725 #else 726 static inline void __init disable_tracing_selftest(const char *reason) 727 { 728 } 729 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 730 #define __tracer_data __read_mostly 731 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 732 733 extern void *head_page(struct trace_array_cpu *data); 734 extern unsigned long long ns2usecs(u64 nsec); 735 extern int 736 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 737 extern int 738 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 739 extern int 740 trace_array_vprintk(struct trace_array *tr, 741 unsigned long ip, const char *fmt, va_list args); 742 int trace_array_printk_buf(struct trace_buffer *buffer, 743 unsigned long ip, const char *fmt, ...); 744 void trace_printk_seq(struct trace_seq *s); 745 enum print_line_t print_trace_line(struct trace_iterator *iter); 746 747 extern char trace_find_mark(unsigned long long duration); 748 749 struct ftrace_hash; 750 751 struct ftrace_mod_load { 752 struct list_head list; 753 char *func; 754 char *module; 755 int enable; 756 }; 757 758 enum { 759 FTRACE_HASH_FL_MOD = (1 << 0), 760 }; 761 762 struct ftrace_hash { 763 unsigned long size_bits; 764 struct hlist_head *buckets; 765 unsigned long count; 766 unsigned long flags; 767 struct rcu_head rcu; 768 }; 769 770 struct ftrace_func_entry * 771 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 772 773 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 774 { 775 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 776 } 777 778 /* Standard output formatting function used for function return traces */ 779 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 780 781 /* Flag options */ 782 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 783 #define TRACE_GRAPH_PRINT_CPU 0x2 784 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 785 #define TRACE_GRAPH_PRINT_PROC 0x8 786 #define TRACE_GRAPH_PRINT_DURATION 0x10 787 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 788 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 789 #define TRACE_GRAPH_PRINT_IRQS 0x80 790 #define TRACE_GRAPH_PRINT_TAIL 0x100 791 #define TRACE_GRAPH_SLEEP_TIME 0x200 792 #define TRACE_GRAPH_GRAPH_TIME 0x400 793 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 794 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 795 796 extern void ftrace_graph_sleep_time_control(bool enable); 797 798 #ifdef CONFIG_FUNCTION_PROFILER 799 extern void ftrace_graph_graph_time_control(bool enable); 800 #else 801 static inline void ftrace_graph_graph_time_control(bool enable) { } 802 #endif 803 804 extern enum print_line_t 805 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 806 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 807 extern void 808 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 809 extern void graph_trace_open(struct trace_iterator *iter); 810 extern void graph_trace_close(struct trace_iterator *iter); 811 extern int __trace_graph_entry(struct trace_array *tr, 812 struct ftrace_graph_ent *trace, 813 unsigned int trace_ctx); 814 extern void __trace_graph_return(struct trace_array *tr, 815 struct ftrace_graph_ret *trace, 816 unsigned int trace_ctx); 817 818 #ifdef CONFIG_DYNAMIC_FTRACE 819 extern struct ftrace_hash __rcu *ftrace_graph_hash; 820 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; 821 822 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 823 { 824 unsigned long addr = trace->func; 825 int ret = 0; 826 struct ftrace_hash *hash; 827 828 preempt_disable_notrace(); 829 830 /* 831 * Have to open code "rcu_dereference_sched()" because the 832 * function graph tracer can be called when RCU is not 833 * "watching". 834 * Protected with schedule_on_each_cpu(ftrace_sync) 835 */ 836 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); 837 838 if (ftrace_hash_empty(hash)) { 839 ret = 1; 840 goto out; 841 } 842 843 if (ftrace_lookup_ip(hash, addr)) { 844 845 /* 846 * This needs to be cleared on the return functions 847 * when the depth is zero. 848 */ 849 trace_recursion_set(TRACE_GRAPH_BIT); 850 trace_recursion_set_depth(trace->depth); 851 852 /* 853 * If no irqs are to be traced, but a set_graph_function 854 * is set, and called by an interrupt handler, we still 855 * want to trace it. 856 */ 857 if (in_irq()) 858 trace_recursion_set(TRACE_IRQ_BIT); 859 else 860 trace_recursion_clear(TRACE_IRQ_BIT); 861 ret = 1; 862 } 863 864 out: 865 preempt_enable_notrace(); 866 return ret; 867 } 868 869 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 870 { 871 if (trace_recursion_test(TRACE_GRAPH_BIT) && 872 trace->depth == trace_recursion_depth()) 873 trace_recursion_clear(TRACE_GRAPH_BIT); 874 } 875 876 static inline int ftrace_graph_notrace_addr(unsigned long addr) 877 { 878 int ret = 0; 879 struct ftrace_hash *notrace_hash; 880 881 preempt_disable_notrace(); 882 883 /* 884 * Have to open code "rcu_dereference_sched()" because the 885 * function graph tracer can be called when RCU is not 886 * "watching". 887 * Protected with schedule_on_each_cpu(ftrace_sync) 888 */ 889 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, 890 !preemptible()); 891 892 if (ftrace_lookup_ip(notrace_hash, addr)) 893 ret = 1; 894 895 preempt_enable_notrace(); 896 return ret; 897 } 898 #else 899 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 900 { 901 return 1; 902 } 903 904 static inline int ftrace_graph_notrace_addr(unsigned long addr) 905 { 906 return 0; 907 } 908 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 909 { } 910 #endif /* CONFIG_DYNAMIC_FTRACE */ 911 912 extern unsigned int fgraph_max_depth; 913 914 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 915 { 916 /* trace it when it is-nested-in or is a function enabled. */ 917 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 918 ftrace_graph_addr(trace)) || 919 (trace->depth < 0) || 920 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 921 } 922 923 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 924 static inline enum print_line_t 925 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 926 { 927 return TRACE_TYPE_UNHANDLED; 928 } 929 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 930 931 extern struct list_head ftrace_pids; 932 933 #ifdef CONFIG_FUNCTION_TRACER 934 935 #define FTRACE_PID_IGNORE -1 936 #define FTRACE_PID_TRACE -2 937 938 struct ftrace_func_command { 939 struct list_head list; 940 char *name; 941 int (*func)(struct trace_array *tr, 942 struct ftrace_hash *hash, 943 char *func, char *cmd, 944 char *params, int enable); 945 }; 946 extern bool ftrace_filter_param __initdata; 947 static inline int ftrace_trace_task(struct trace_array *tr) 948 { 949 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) != 950 FTRACE_PID_IGNORE; 951 } 952 extern int ftrace_is_dead(void); 953 int ftrace_create_function_files(struct trace_array *tr, 954 struct dentry *parent); 955 void ftrace_destroy_function_files(struct trace_array *tr); 956 int ftrace_allocate_ftrace_ops(struct trace_array *tr); 957 void ftrace_free_ftrace_ops(struct trace_array *tr); 958 void ftrace_init_global_array_ops(struct trace_array *tr); 959 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 960 void ftrace_reset_array_ops(struct trace_array *tr); 961 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 962 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 963 struct dentry *d_tracer); 964 void ftrace_clear_pids(struct trace_array *tr); 965 int init_function_trace(void); 966 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 967 #else 968 static inline int ftrace_trace_task(struct trace_array *tr) 969 { 970 return 1; 971 } 972 static inline int ftrace_is_dead(void) { return 0; } 973 static inline int 974 ftrace_create_function_files(struct trace_array *tr, 975 struct dentry *parent) 976 { 977 return 0; 978 } 979 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) 980 { 981 return 0; 982 } 983 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } 984 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 985 static inline __init void 986 ftrace_init_global_array_ops(struct trace_array *tr) { } 987 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 988 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 989 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 990 static inline void ftrace_clear_pids(struct trace_array *tr) { } 991 static inline int init_function_trace(void) { return 0; } 992 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 993 /* ftace_func_t type is not defined, use macro instead of static inline */ 994 #define ftrace_init_array_ops(tr, func) do { } while (0) 995 #endif /* CONFIG_FUNCTION_TRACER */ 996 997 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 998 999 struct ftrace_probe_ops { 1000 void (*func)(unsigned long ip, 1001 unsigned long parent_ip, 1002 struct trace_array *tr, 1003 struct ftrace_probe_ops *ops, 1004 void *data); 1005 int (*init)(struct ftrace_probe_ops *ops, 1006 struct trace_array *tr, 1007 unsigned long ip, void *init_data, 1008 void **data); 1009 void (*free)(struct ftrace_probe_ops *ops, 1010 struct trace_array *tr, 1011 unsigned long ip, void *data); 1012 int (*print)(struct seq_file *m, 1013 unsigned long ip, 1014 struct ftrace_probe_ops *ops, 1015 void *data); 1016 }; 1017 1018 struct ftrace_func_mapper; 1019 typedef int (*ftrace_mapper_func)(void *data); 1020 1021 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1022 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1023 unsigned long ip); 1024 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1025 unsigned long ip, void *data); 1026 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1027 unsigned long ip); 1028 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1029 ftrace_mapper_func free_func); 1030 1031 extern int 1032 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1033 struct ftrace_probe_ops *ops, void *data); 1034 extern int 1035 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1036 struct ftrace_probe_ops *ops); 1037 extern void clear_ftrace_function_probes(struct trace_array *tr); 1038 1039 int register_ftrace_command(struct ftrace_func_command *cmd); 1040 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1041 1042 void ftrace_create_filter_files(struct ftrace_ops *ops, 1043 struct dentry *parent); 1044 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1045 1046 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, 1047 int len, int reset); 1048 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, 1049 int len, int reset); 1050 #else 1051 struct ftrace_func_command; 1052 1053 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1054 { 1055 return -EINVAL; 1056 } 1057 static inline __init int unregister_ftrace_command(char *cmd_name) 1058 { 1059 return -EINVAL; 1060 } 1061 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1062 { 1063 } 1064 1065 /* 1066 * The ops parameter passed in is usually undefined. 1067 * This must be a macro. 1068 */ 1069 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1070 #define ftrace_destroy_filter_files(ops) do { } while (0) 1071 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1072 1073 bool ftrace_event_is_function(struct trace_event_call *call); 1074 1075 /* 1076 * struct trace_parser - servers for reading the user input separated by spaces 1077 * @cont: set if the input is not complete - no final space char was found 1078 * @buffer: holds the parsed user input 1079 * @idx: user input length 1080 * @size: buffer size 1081 */ 1082 struct trace_parser { 1083 bool cont; 1084 char *buffer; 1085 unsigned idx; 1086 unsigned size; 1087 }; 1088 1089 static inline bool trace_parser_loaded(struct trace_parser *parser) 1090 { 1091 return (parser->idx != 0); 1092 } 1093 1094 static inline bool trace_parser_cont(struct trace_parser *parser) 1095 { 1096 return parser->cont; 1097 } 1098 1099 static inline void trace_parser_clear(struct trace_parser *parser) 1100 { 1101 parser->cont = false; 1102 parser->idx = 0; 1103 } 1104 1105 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1106 extern void trace_parser_put(struct trace_parser *parser); 1107 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1108 size_t cnt, loff_t *ppos); 1109 1110 /* 1111 * Only create function graph options if function graph is configured. 1112 */ 1113 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1114 # define FGRAPH_FLAGS \ 1115 C(DISPLAY_GRAPH, "display-graph"), 1116 #else 1117 # define FGRAPH_FLAGS 1118 #endif 1119 1120 #ifdef CONFIG_BRANCH_TRACER 1121 # define BRANCH_FLAGS \ 1122 C(BRANCH, "branch"), 1123 #else 1124 # define BRANCH_FLAGS 1125 #endif 1126 1127 #ifdef CONFIG_FUNCTION_TRACER 1128 # define FUNCTION_FLAGS \ 1129 C(FUNCTION, "function-trace"), \ 1130 C(FUNC_FORK, "function-fork"), 1131 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1132 #else 1133 # define FUNCTION_FLAGS 1134 # define FUNCTION_DEFAULT_FLAGS 0UL 1135 # define TRACE_ITER_FUNC_FORK 0UL 1136 #endif 1137 1138 #ifdef CONFIG_STACKTRACE 1139 # define STACK_FLAGS \ 1140 C(STACKTRACE, "stacktrace"), 1141 #else 1142 # define STACK_FLAGS 1143 #endif 1144 1145 /* 1146 * trace_iterator_flags is an enumeration that defines bit 1147 * positions into trace_flags that controls the output. 1148 * 1149 * NOTE: These bits must match the trace_options array in 1150 * trace.c (this macro guarantees it). 1151 */ 1152 #define TRACE_FLAGS \ 1153 C(PRINT_PARENT, "print-parent"), \ 1154 C(SYM_OFFSET, "sym-offset"), \ 1155 C(SYM_ADDR, "sym-addr"), \ 1156 C(VERBOSE, "verbose"), \ 1157 C(RAW, "raw"), \ 1158 C(HEX, "hex"), \ 1159 C(BIN, "bin"), \ 1160 C(BLOCK, "block"), \ 1161 C(PRINTK, "trace_printk"), \ 1162 C(ANNOTATE, "annotate"), \ 1163 C(USERSTACKTRACE, "userstacktrace"), \ 1164 C(SYM_USEROBJ, "sym-userobj"), \ 1165 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1166 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1167 C(LATENCY_FMT, "latency-format"), \ 1168 C(RECORD_CMD, "record-cmd"), \ 1169 C(RECORD_TGID, "record-tgid"), \ 1170 C(OVERWRITE, "overwrite"), \ 1171 C(STOP_ON_FREE, "disable_on_free"), \ 1172 C(IRQ_INFO, "irq-info"), \ 1173 C(MARKERS, "markers"), \ 1174 C(EVENT_FORK, "event-fork"), \ 1175 C(PAUSE_ON_TRACE, "pause-on-trace"), \ 1176 FUNCTION_FLAGS \ 1177 FGRAPH_FLAGS \ 1178 STACK_FLAGS \ 1179 BRANCH_FLAGS 1180 1181 /* 1182 * By defining C, we can make TRACE_FLAGS a list of bit names 1183 * that will define the bits for the flag masks. 1184 */ 1185 #undef C 1186 #define C(a, b) TRACE_ITER_##a##_BIT 1187 1188 enum trace_iterator_bits { 1189 TRACE_FLAGS 1190 /* Make sure we don't go more than we have bits for */ 1191 TRACE_ITER_LAST_BIT 1192 }; 1193 1194 /* 1195 * By redefining C, we can make TRACE_FLAGS a list of masks that 1196 * use the bits as defined above. 1197 */ 1198 #undef C 1199 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1200 1201 enum trace_iterator_flags { TRACE_FLAGS }; 1202 1203 /* 1204 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1205 * control the output of kernel symbols. 1206 */ 1207 #define TRACE_ITER_SYM_MASK \ 1208 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1209 1210 extern struct tracer nop_trace; 1211 1212 #ifdef CONFIG_BRANCH_TRACER 1213 extern int enable_branch_tracing(struct trace_array *tr); 1214 extern void disable_branch_tracing(void); 1215 static inline int trace_branch_enable(struct trace_array *tr) 1216 { 1217 if (tr->trace_flags & TRACE_ITER_BRANCH) 1218 return enable_branch_tracing(tr); 1219 return 0; 1220 } 1221 static inline void trace_branch_disable(void) 1222 { 1223 /* due to races, always disable */ 1224 disable_branch_tracing(); 1225 } 1226 #else 1227 static inline int trace_branch_enable(struct trace_array *tr) 1228 { 1229 return 0; 1230 } 1231 static inline void trace_branch_disable(void) 1232 { 1233 } 1234 #endif /* CONFIG_BRANCH_TRACER */ 1235 1236 /* set ring buffers to default size if not already done so */ 1237 int tracing_update_buffers(void); 1238 1239 struct ftrace_event_field { 1240 struct list_head link; 1241 const char *name; 1242 const char *type; 1243 int filter_type; 1244 int offset; 1245 int size; 1246 int is_signed; 1247 }; 1248 1249 struct prog_entry; 1250 1251 struct event_filter { 1252 struct prog_entry __rcu *prog; 1253 char *filter_string; 1254 }; 1255 1256 struct event_subsystem { 1257 struct list_head list; 1258 const char *name; 1259 struct event_filter *filter; 1260 int ref_count; 1261 }; 1262 1263 struct trace_subsystem_dir { 1264 struct list_head list; 1265 struct event_subsystem *subsystem; 1266 struct trace_array *tr; 1267 struct dentry *entry; 1268 int ref_count; 1269 int nr_events; 1270 }; 1271 1272 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1273 struct trace_buffer *buffer, 1274 struct ring_buffer_event *event); 1275 1276 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1277 struct trace_buffer *buffer, 1278 struct ring_buffer_event *event, 1279 unsigned int trcace_ctx, 1280 struct pt_regs *regs); 1281 1282 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1283 struct trace_buffer *buffer, 1284 struct ring_buffer_event *event, 1285 unsigned int trace_ctx) 1286 { 1287 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL); 1288 } 1289 1290 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1291 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1292 void trace_buffered_event_disable(void); 1293 void trace_buffered_event_enable(void); 1294 1295 static inline void 1296 __trace_event_discard_commit(struct trace_buffer *buffer, 1297 struct ring_buffer_event *event) 1298 { 1299 if (this_cpu_read(trace_buffered_event) == event) { 1300 /* Simply release the temp buffer */ 1301 this_cpu_dec(trace_buffered_event_cnt); 1302 return; 1303 } 1304 ring_buffer_discard_commit(buffer, event); 1305 } 1306 1307 /* 1308 * Helper function for event_trigger_unlock_commit{_regs}(). 1309 * If there are event triggers attached to this event that requires 1310 * filtering against its fields, then they will be called as the 1311 * entry already holds the field information of the current event. 1312 * 1313 * It also checks if the event should be discarded or not. 1314 * It is to be discarded if the event is soft disabled and the 1315 * event was only recorded to process triggers, or if the event 1316 * filter is active and this event did not match the filters. 1317 * 1318 * Returns true if the event is discarded, false otherwise. 1319 */ 1320 static inline bool 1321 __event_trigger_test_discard(struct trace_event_file *file, 1322 struct trace_buffer *buffer, 1323 struct ring_buffer_event *event, 1324 void *entry, 1325 enum event_trigger_type *tt) 1326 { 1327 unsigned long eflags = file->flags; 1328 1329 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1330 *tt = event_triggers_call(file, entry, event); 1331 1332 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || 1333 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && 1334 !filter_match_preds(file->filter, entry))) { 1335 __trace_event_discard_commit(buffer, event); 1336 return true; 1337 } 1338 1339 return false; 1340 } 1341 1342 /** 1343 * event_trigger_unlock_commit - handle triggers and finish event commit 1344 * @file: The file pointer assoctiated to the event 1345 * @buffer: The ring buffer that the event is being written to 1346 * @event: The event meta data in the ring buffer 1347 * @entry: The event itself 1348 * @trace_ctx: The tracing context flags. 1349 * 1350 * This is a helper function to handle triggers that require data 1351 * from the event itself. It also tests the event against filters and 1352 * if the event is soft disabled and should be discarded. 1353 */ 1354 static inline void 1355 event_trigger_unlock_commit(struct trace_event_file *file, 1356 struct trace_buffer *buffer, 1357 struct ring_buffer_event *event, 1358 void *entry, unsigned int trace_ctx) 1359 { 1360 enum event_trigger_type tt = ETT_NONE; 1361 1362 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1363 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx); 1364 1365 if (tt) 1366 event_triggers_post_call(file, tt); 1367 } 1368 1369 /** 1370 * event_trigger_unlock_commit_regs - handle triggers and finish event commit 1371 * @file: The file pointer assoctiated to the event 1372 * @buffer: The ring buffer that the event is being written to 1373 * @event: The event meta data in the ring buffer 1374 * @entry: The event itself 1375 * @trace_ctx: The tracing context flags. 1376 * 1377 * This is a helper function to handle triggers that require data 1378 * from the event itself. It also tests the event against filters and 1379 * if the event is soft disabled and should be discarded. 1380 * 1381 * Same as event_trigger_unlock_commit() but calls 1382 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). 1383 */ 1384 static inline void 1385 event_trigger_unlock_commit_regs(struct trace_event_file *file, 1386 struct trace_buffer *buffer, 1387 struct ring_buffer_event *event, 1388 void *entry, unsigned int trace_ctx, 1389 struct pt_regs *regs) 1390 { 1391 enum event_trigger_type tt = ETT_NONE; 1392 1393 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1394 trace_buffer_unlock_commit_regs(file->tr, buffer, event, 1395 trace_ctx, regs); 1396 1397 if (tt) 1398 event_triggers_post_call(file, tt); 1399 } 1400 1401 #define FILTER_PRED_INVALID ((unsigned short)-1) 1402 #define FILTER_PRED_IS_RIGHT (1 << 15) 1403 #define FILTER_PRED_FOLD (1 << 15) 1404 1405 /* 1406 * The max preds is the size of unsigned short with 1407 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1408 * and FOLD flags. The other is reserved. 1409 * 1410 * 2^14 preds is way more than enough. 1411 */ 1412 #define MAX_FILTER_PRED 16384 1413 1414 struct filter_pred; 1415 struct regex; 1416 1417 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1418 1419 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1420 1421 enum regex_type { 1422 MATCH_FULL = 0, 1423 MATCH_FRONT_ONLY, 1424 MATCH_MIDDLE_ONLY, 1425 MATCH_END_ONLY, 1426 MATCH_GLOB, 1427 MATCH_INDEX, 1428 }; 1429 1430 struct regex { 1431 char pattern[MAX_FILTER_STR_VAL]; 1432 int len; 1433 int field_len; 1434 regex_match_func match; 1435 }; 1436 1437 struct filter_pred { 1438 filter_pred_fn_t fn; 1439 u64 val; 1440 struct regex regex; 1441 unsigned short *ops; 1442 struct ftrace_event_field *field; 1443 int offset; 1444 int not; 1445 int op; 1446 }; 1447 1448 static inline bool is_string_field(struct ftrace_event_field *field) 1449 { 1450 return field->filter_type == FILTER_DYN_STRING || 1451 field->filter_type == FILTER_STATIC_STRING || 1452 field->filter_type == FILTER_PTR_STRING || 1453 field->filter_type == FILTER_COMM; 1454 } 1455 1456 static inline bool is_function_field(struct ftrace_event_field *field) 1457 { 1458 return field->filter_type == FILTER_TRACE_FN; 1459 } 1460 1461 extern enum regex_type 1462 filter_parse_regex(char *buff, int len, char **search, int *not); 1463 extern void print_event_filter(struct trace_event_file *file, 1464 struct trace_seq *s); 1465 extern int apply_event_filter(struct trace_event_file *file, 1466 char *filter_string); 1467 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1468 char *filter_string); 1469 extern void print_subsystem_event_filter(struct event_subsystem *system, 1470 struct trace_seq *s); 1471 extern int filter_assign_type(const char *type); 1472 extern int create_event_filter(struct trace_array *tr, 1473 struct trace_event_call *call, 1474 char *filter_str, bool set_str, 1475 struct event_filter **filterp); 1476 extern void free_event_filter(struct event_filter *filter); 1477 1478 struct ftrace_event_field * 1479 trace_find_event_field(struct trace_event_call *call, char *name); 1480 1481 extern void trace_event_enable_cmd_record(bool enable); 1482 extern void trace_event_enable_tgid_record(bool enable); 1483 1484 extern int event_trace_init(void); 1485 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1486 extern int event_trace_del_tracer(struct trace_array *tr); 1487 extern void __trace_early_add_events(struct trace_array *tr); 1488 1489 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1490 const char *system, 1491 const char *event); 1492 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1493 const char *system, 1494 const char *event); 1495 1496 static inline void *event_file_data(struct file *filp) 1497 { 1498 return READ_ONCE(file_inode(filp)->i_private); 1499 } 1500 1501 extern struct mutex event_mutex; 1502 extern struct list_head ftrace_events; 1503 1504 extern const struct file_operations event_trigger_fops; 1505 extern const struct file_operations event_hist_fops; 1506 extern const struct file_operations event_hist_debug_fops; 1507 extern const struct file_operations event_inject_fops; 1508 1509 #ifdef CONFIG_HIST_TRIGGERS 1510 extern int register_trigger_hist_cmd(void); 1511 extern int register_trigger_hist_enable_disable_cmds(void); 1512 #else 1513 static inline int register_trigger_hist_cmd(void) { return 0; } 1514 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1515 #endif 1516 1517 extern int register_trigger_cmds(void); 1518 extern void clear_event_triggers(struct trace_array *tr); 1519 1520 struct event_trigger_data { 1521 unsigned long count; 1522 int ref; 1523 struct event_trigger_ops *ops; 1524 struct event_command *cmd_ops; 1525 struct event_filter __rcu *filter; 1526 char *filter_str; 1527 void *private_data; 1528 bool paused; 1529 bool paused_tmp; 1530 struct list_head list; 1531 char *name; 1532 struct list_head named_list; 1533 struct event_trigger_data *named_data; 1534 }; 1535 1536 /* Avoid typos */ 1537 #define ENABLE_EVENT_STR "enable_event" 1538 #define DISABLE_EVENT_STR "disable_event" 1539 #define ENABLE_HIST_STR "enable_hist" 1540 #define DISABLE_HIST_STR "disable_hist" 1541 1542 struct enable_trigger_data { 1543 struct trace_event_file *file; 1544 bool enable; 1545 bool hist; 1546 }; 1547 1548 extern int event_enable_trigger_print(struct seq_file *m, 1549 struct event_trigger_ops *ops, 1550 struct event_trigger_data *data); 1551 extern void event_enable_trigger_free(struct event_trigger_ops *ops, 1552 struct event_trigger_data *data); 1553 extern int event_enable_trigger_func(struct event_command *cmd_ops, 1554 struct trace_event_file *file, 1555 char *glob, char *cmd, char *param); 1556 extern int event_enable_register_trigger(char *glob, 1557 struct event_trigger_ops *ops, 1558 struct event_trigger_data *data, 1559 struct trace_event_file *file); 1560 extern void event_enable_unregister_trigger(char *glob, 1561 struct event_trigger_ops *ops, 1562 struct event_trigger_data *test, 1563 struct trace_event_file *file); 1564 extern void trigger_data_free(struct event_trigger_data *data); 1565 extern int event_trigger_init(struct event_trigger_ops *ops, 1566 struct event_trigger_data *data); 1567 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1568 int trigger_enable); 1569 extern void update_cond_flag(struct trace_event_file *file); 1570 extern int set_trigger_filter(char *filter_str, 1571 struct event_trigger_data *trigger_data, 1572 struct trace_event_file *file); 1573 extern struct event_trigger_data *find_named_trigger(const char *name); 1574 extern bool is_named_trigger(struct event_trigger_data *test); 1575 extern int save_named_trigger(const char *name, 1576 struct event_trigger_data *data); 1577 extern void del_named_trigger(struct event_trigger_data *data); 1578 extern void pause_named_trigger(struct event_trigger_data *data); 1579 extern void unpause_named_trigger(struct event_trigger_data *data); 1580 extern void set_named_trigger_data(struct event_trigger_data *data, 1581 struct event_trigger_data *named_data); 1582 extern struct event_trigger_data * 1583 get_named_trigger_data(struct event_trigger_data *data); 1584 extern int register_event_command(struct event_command *cmd); 1585 extern int unregister_event_command(struct event_command *cmd); 1586 extern int register_trigger_hist_enable_disable_cmds(void); 1587 1588 /** 1589 * struct event_trigger_ops - callbacks for trace event triggers 1590 * 1591 * The methods in this structure provide per-event trigger hooks for 1592 * various trigger operations. 1593 * 1594 * All the methods below, except for @init() and @free(), must be 1595 * implemented. 1596 * 1597 * @func: The trigger 'probe' function called when the triggering 1598 * event occurs. The data passed into this callback is the data 1599 * that was supplied to the event_command @reg() function that 1600 * registered the trigger (see struct event_command) along with 1601 * the trace record, rec. 1602 * 1603 * @init: An optional initialization function called for the trigger 1604 * when the trigger is registered (via the event_command reg() 1605 * function). This can be used to perform per-trigger 1606 * initialization such as incrementing a per-trigger reference 1607 * count, for instance. This is usually implemented by the 1608 * generic utility function @event_trigger_init() (see 1609 * trace_event_triggers.c). 1610 * 1611 * @free: An optional de-initialization function called for the 1612 * trigger when the trigger is unregistered (via the 1613 * event_command @reg() function). This can be used to perform 1614 * per-trigger de-initialization such as decrementing a 1615 * per-trigger reference count and freeing corresponding trigger 1616 * data, for instance. This is usually implemented by the 1617 * generic utility function @event_trigger_free() (see 1618 * trace_event_triggers.c). 1619 * 1620 * @print: The callback function invoked to have the trigger print 1621 * itself. This is usually implemented by a wrapper function 1622 * that calls the generic utility function @event_trigger_print() 1623 * (see trace_event_triggers.c). 1624 */ 1625 struct event_trigger_ops { 1626 void (*func)(struct event_trigger_data *data, 1627 void *rec, 1628 struct ring_buffer_event *rbe); 1629 int (*init)(struct event_trigger_ops *ops, 1630 struct event_trigger_data *data); 1631 void (*free)(struct event_trigger_ops *ops, 1632 struct event_trigger_data *data); 1633 int (*print)(struct seq_file *m, 1634 struct event_trigger_ops *ops, 1635 struct event_trigger_data *data); 1636 }; 1637 1638 /** 1639 * struct event_command - callbacks and data members for event commands 1640 * 1641 * Event commands are invoked by users by writing the command name 1642 * into the 'trigger' file associated with a trace event. The 1643 * parameters associated with a specific invocation of an event 1644 * command are used to create an event trigger instance, which is 1645 * added to the list of trigger instances associated with that trace 1646 * event. When the event is hit, the set of triggers associated with 1647 * that event is invoked. 1648 * 1649 * The data members in this structure provide per-event command data 1650 * for various event commands. 1651 * 1652 * All the data members below, except for @post_trigger, must be set 1653 * for each event command. 1654 * 1655 * @name: The unique name that identifies the event command. This is 1656 * the name used when setting triggers via trigger files. 1657 * 1658 * @trigger_type: A unique id that identifies the event command 1659 * 'type'. This value has two purposes, the first to ensure that 1660 * only one trigger of the same type can be set at a given time 1661 * for a particular event e.g. it doesn't make sense to have both 1662 * a traceon and traceoff trigger attached to a single event at 1663 * the same time, so traceon and traceoff have the same type 1664 * though they have different names. The @trigger_type value is 1665 * also used as a bit value for deferring the actual trigger 1666 * action until after the current event is finished. Some 1667 * commands need to do this if they themselves log to the trace 1668 * buffer (see the @post_trigger() member below). @trigger_type 1669 * values are defined by adding new values to the trigger_type 1670 * enum in include/linux/trace_events.h. 1671 * 1672 * @flags: See the enum event_command_flags below. 1673 * 1674 * All the methods below, except for @set_filter() and @unreg_all(), 1675 * must be implemented. 1676 * 1677 * @func: The callback function responsible for parsing and 1678 * registering the trigger written to the 'trigger' file by the 1679 * user. It allocates the trigger instance and registers it with 1680 * the appropriate trace event. It makes use of the other 1681 * event_command callback functions to orchestrate this, and is 1682 * usually implemented by the generic utility function 1683 * @event_trigger_callback() (see trace_event_triggers.c). 1684 * 1685 * @reg: Adds the trigger to the list of triggers associated with the 1686 * event, and enables the event trigger itself, after 1687 * initializing it (via the event_trigger_ops @init() function). 1688 * This is also where commands can use the @trigger_type value to 1689 * make the decision as to whether or not multiple instances of 1690 * the trigger should be allowed. This is usually implemented by 1691 * the generic utility function @register_trigger() (see 1692 * trace_event_triggers.c). 1693 * 1694 * @unreg: Removes the trigger from the list of triggers associated 1695 * with the event, and disables the event trigger itself, after 1696 * initializing it (via the event_trigger_ops @free() function). 1697 * This is usually implemented by the generic utility function 1698 * @unregister_trigger() (see trace_event_triggers.c). 1699 * 1700 * @unreg_all: An optional function called to remove all the triggers 1701 * from the list of triggers associated with the event. Called 1702 * when a trigger file is opened in truncate mode. 1703 * 1704 * @set_filter: An optional function called to parse and set a filter 1705 * for the trigger. If no @set_filter() method is set for the 1706 * event command, filters set by the user for the command will be 1707 * ignored. This is usually implemented by the generic utility 1708 * function @set_trigger_filter() (see trace_event_triggers.c). 1709 * 1710 * @get_trigger_ops: The callback function invoked to retrieve the 1711 * event_trigger_ops implementation associated with the command. 1712 */ 1713 struct event_command { 1714 struct list_head list; 1715 char *name; 1716 enum event_trigger_type trigger_type; 1717 int flags; 1718 int (*func)(struct event_command *cmd_ops, 1719 struct trace_event_file *file, 1720 char *glob, char *cmd, char *params); 1721 int (*reg)(char *glob, 1722 struct event_trigger_ops *ops, 1723 struct event_trigger_data *data, 1724 struct trace_event_file *file); 1725 void (*unreg)(char *glob, 1726 struct event_trigger_ops *ops, 1727 struct event_trigger_data *data, 1728 struct trace_event_file *file); 1729 void (*unreg_all)(struct trace_event_file *file); 1730 int (*set_filter)(char *filter_str, 1731 struct event_trigger_data *data, 1732 struct trace_event_file *file); 1733 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1734 }; 1735 1736 /** 1737 * enum event_command_flags - flags for struct event_command 1738 * 1739 * @POST_TRIGGER: A flag that says whether or not this command needs 1740 * to have its action delayed until after the current event has 1741 * been closed. Some triggers need to avoid being invoked while 1742 * an event is currently in the process of being logged, since 1743 * the trigger may itself log data into the trace buffer. Thus 1744 * we make sure the current event is committed before invoking 1745 * those triggers. To do that, the trigger invocation is split 1746 * in two - the first part checks the filter using the current 1747 * trace record; if a command has the @post_trigger flag set, it 1748 * sets a bit for itself in the return value, otherwise it 1749 * directly invokes the trigger. Once all commands have been 1750 * either invoked or set their return flag, the current record is 1751 * either committed or discarded. At that point, if any commands 1752 * have deferred their triggers, those commands are finally 1753 * invoked following the close of the current event. In other 1754 * words, if the event_trigger_ops @func() probe implementation 1755 * itself logs to the trace buffer, this flag should be set, 1756 * otherwise it can be left unspecified. 1757 * 1758 * @NEEDS_REC: A flag that says whether or not this command needs 1759 * access to the trace record in order to perform its function, 1760 * regardless of whether or not it has a filter associated with 1761 * it (filters make a trigger require access to the trace record 1762 * but are not always present). 1763 */ 1764 enum event_command_flags { 1765 EVENT_CMD_FL_POST_TRIGGER = 1, 1766 EVENT_CMD_FL_NEEDS_REC = 2, 1767 }; 1768 1769 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1770 { 1771 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1772 } 1773 1774 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1775 { 1776 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1777 } 1778 1779 extern int trace_event_enable_disable(struct trace_event_file *file, 1780 int enable, int soft_disable); 1781 extern int tracing_alloc_snapshot(void); 1782 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1783 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1784 1785 extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1786 extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1787 1788 extern const char *__start___trace_bprintk_fmt[]; 1789 extern const char *__stop___trace_bprintk_fmt[]; 1790 1791 extern const char *__start___tracepoint_str[]; 1792 extern const char *__stop___tracepoint_str[]; 1793 1794 void trace_printk_control(bool enabled); 1795 void trace_printk_start_comm(void); 1796 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1797 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1798 1799 /* Used from boot time tracer */ 1800 extern int trace_set_options(struct trace_array *tr, char *option); 1801 extern int tracing_set_tracer(struct trace_array *tr, const char *buf); 1802 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr, 1803 unsigned long size, int cpu_id); 1804 extern int tracing_set_cpumask(struct trace_array *tr, 1805 cpumask_var_t tracing_cpumask_new); 1806 1807 1808 #define MAX_EVENT_NAME_LEN 64 1809 1810 extern ssize_t trace_parse_run_command(struct file *file, 1811 const char __user *buffer, size_t count, loff_t *ppos, 1812 int (*createfn)(const char *)); 1813 1814 extern unsigned int err_pos(char *cmd, const char *str); 1815 extern void tracing_log_err(struct trace_array *tr, 1816 const char *loc, const char *cmd, 1817 const char **errs, u8 type, u8 pos); 1818 1819 /* 1820 * Normal trace_printk() and friends allocates special buffers 1821 * to do the manipulation, as well as saves the print formats 1822 * into sections to display. But the trace infrastructure wants 1823 * to use these without the added overhead at the price of being 1824 * a bit slower (used mainly for warnings, where we don't care 1825 * about performance). The internal_trace_puts() is for such 1826 * a purpose. 1827 */ 1828 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1829 1830 #undef FTRACE_ENTRY 1831 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 1832 extern struct trace_event_call \ 1833 __aligned(4) event_##call; 1834 #undef FTRACE_ENTRY_DUP 1835 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 1836 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1837 #undef FTRACE_ENTRY_PACKED 1838 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \ 1839 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1840 1841 #include "trace_entries.h" 1842 1843 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1844 int perf_ftrace_event_register(struct trace_event_call *call, 1845 enum trace_reg type, void *data); 1846 #else 1847 #define perf_ftrace_event_register NULL 1848 #endif 1849 1850 #ifdef CONFIG_FTRACE_SYSCALLS 1851 void init_ftrace_syscalls(void); 1852 const char *get_syscall_name(int syscall); 1853 #else 1854 static inline void init_ftrace_syscalls(void) { } 1855 static inline const char *get_syscall_name(int syscall) 1856 { 1857 return NULL; 1858 } 1859 #endif 1860 1861 #ifdef CONFIG_EVENT_TRACING 1862 void trace_event_init(void); 1863 void trace_event_eval_update(struct trace_eval_map **map, int len); 1864 /* Used from boot time tracer */ 1865 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); 1866 extern int trigger_process_regex(struct trace_event_file *file, char *buff); 1867 #else 1868 static inline void __init trace_event_init(void) { } 1869 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1870 #endif 1871 1872 #ifdef CONFIG_TRACER_SNAPSHOT 1873 void tracing_snapshot_instance(struct trace_array *tr); 1874 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1875 #else 1876 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1877 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1878 { 1879 return 0; 1880 } 1881 #endif 1882 1883 #ifdef CONFIG_PREEMPT_TRACER 1884 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1885 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1886 #else 1887 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1888 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1889 #endif 1890 #ifdef CONFIG_IRQSOFF_TRACER 1891 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1892 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1893 #else 1894 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1895 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1896 #endif 1897 1898 extern struct trace_iterator *tracepoint_print_iter; 1899 1900 /* 1901 * Reset the state of the trace_iterator so that it can read consumed data. 1902 * Normally, the trace_iterator is used for reading the data when it is not 1903 * consumed, and must retain state. 1904 */ 1905 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 1906 { 1907 const size_t offset = offsetof(struct trace_iterator, seq); 1908 1909 /* 1910 * Keep gcc from complaining about overwriting more than just one 1911 * member in the structure. 1912 */ 1913 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset); 1914 1915 iter->pos = -1; 1916 } 1917 1918 /* Check the name is good for event/group/fields */ 1919 static inline bool is_good_name(const char *name) 1920 { 1921 if (!isalpha(*name) && *name != '_') 1922 return false; 1923 while (*++name != '\0') { 1924 if (!isalpha(*name) && !isdigit(*name) && *name != '_') 1925 return false; 1926 } 1927 return true; 1928 } 1929 1930 #endif /* _LINUX_KERNEL_TRACE_H */ 1931