1 // SPDX-License-Identifier: GPL-2.0 2 3 #ifndef _LINUX_KERNEL_TRACE_H 4 #define _LINUX_KERNEL_TRACE_H 5 6 #include <linux/fs.h> 7 #include <linux/atomic.h> 8 #include <linux/sched.h> 9 #include <linux/clocksource.h> 10 #include <linux/ring_buffer.h> 11 #include <linux/mmiotrace.h> 12 #include <linux/tracepoint.h> 13 #include <linux/ftrace.h> 14 #include <linux/trace.h> 15 #include <linux/hw_breakpoint.h> 16 #include <linux/trace_seq.h> 17 #include <linux/trace_events.h> 18 #include <linux/compiler.h> 19 #include <linux/glob.h> 20 #include <linux/irq_work.h> 21 #include <linux/workqueue.h> 22 #include <linux/ctype.h> 23 #include <linux/once_lite.h> 24 25 #include "pid_list.h" 26 27 #ifdef CONFIG_FTRACE_SYSCALLS 28 #include <asm/unistd.h> /* For NR_syscalls */ 29 #include <asm/syscall.h> /* some archs define it here */ 30 #endif 31 32 #define TRACE_MODE_WRITE 0640 33 #define TRACE_MODE_READ 0440 34 35 enum trace_type { 36 __TRACE_FIRST_TYPE = 0, 37 38 TRACE_FN, 39 TRACE_CTX, 40 TRACE_WAKE, 41 TRACE_STACK, 42 TRACE_PRINT, 43 TRACE_BPRINT, 44 TRACE_MMIO_RW, 45 TRACE_MMIO_MAP, 46 TRACE_BRANCH, 47 TRACE_GRAPH_RET, 48 TRACE_GRAPH_ENT, 49 TRACE_USER_STACK, 50 TRACE_BLK, 51 TRACE_BPUTS, 52 TRACE_HWLAT, 53 TRACE_OSNOISE, 54 TRACE_TIMERLAT, 55 TRACE_RAW_DATA, 56 TRACE_FUNC_REPEATS, 57 58 __TRACE_LAST_TYPE, 59 }; 60 61 62 #undef __field 63 #define __field(type, item) type item; 64 65 #undef __field_fn 66 #define __field_fn(type, item) type item; 67 68 #undef __field_struct 69 #define __field_struct(type, item) __field(type, item) 70 71 #undef __field_desc 72 #define __field_desc(type, container, item) 73 74 #undef __field_packed 75 #define __field_packed(type, container, item) 76 77 #undef __array 78 #define __array(type, item, size) type item[size]; 79 80 #undef __array_desc 81 #define __array_desc(type, container, item, size) 82 83 #undef __dynamic_array 84 #define __dynamic_array(type, item) type item[]; 85 86 #undef __rel_dynamic_array 87 #define __rel_dynamic_array(type, item) type item[]; 88 89 #undef F_STRUCT 90 #define F_STRUCT(args...) args 91 92 #undef FTRACE_ENTRY 93 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 94 struct struct_name { \ 95 struct trace_entry ent; \ 96 tstruct \ 97 } 98 99 #undef FTRACE_ENTRY_DUP 100 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 101 102 #undef FTRACE_ENTRY_REG 103 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ 104 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 105 106 #undef FTRACE_ENTRY_PACKED 107 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ 108 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed 109 110 #include "trace_entries.h" 111 112 /* Use this for memory failure errors */ 113 #define MEM_FAIL(condition, fmt, ...) \ 114 DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__) 115 116 #define HIST_STACKTRACE_DEPTH 16 117 #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long)) 118 #define HIST_STACKTRACE_SKIP 5 119 120 /* 121 * syscalls are special, and need special handling, this is why 122 * they are not included in trace_entries.h 123 */ 124 struct syscall_trace_enter { 125 struct trace_entry ent; 126 int nr; 127 unsigned long args[]; 128 }; 129 130 struct syscall_trace_exit { 131 struct trace_entry ent; 132 int nr; 133 long ret; 134 }; 135 136 struct kprobe_trace_entry_head { 137 struct trace_entry ent; 138 unsigned long ip; 139 }; 140 141 struct eprobe_trace_entry_head { 142 struct trace_entry ent; 143 }; 144 145 struct kretprobe_trace_entry_head { 146 struct trace_entry ent; 147 unsigned long func; 148 unsigned long ret_ip; 149 }; 150 151 struct fentry_trace_entry_head { 152 struct trace_entry ent; 153 unsigned long ip; 154 }; 155 156 struct fexit_trace_entry_head { 157 struct trace_entry ent; 158 unsigned long func; 159 unsigned long ret_ip; 160 }; 161 162 #define TRACE_BUF_SIZE 1024 163 164 struct trace_array; 165 166 /* 167 * The CPU trace array - it consists of thousands of trace entries 168 * plus some other descriptor data: (for example which task started 169 * the trace, etc.) 170 */ 171 struct trace_array_cpu { 172 atomic_t disabled; 173 void *buffer_page; /* ring buffer spare */ 174 175 unsigned long entries; 176 unsigned long saved_latency; 177 unsigned long critical_start; 178 unsigned long critical_end; 179 unsigned long critical_sequence; 180 unsigned long nice; 181 unsigned long policy; 182 unsigned long rt_priority; 183 unsigned long skipped_entries; 184 u64 preempt_timestamp; 185 pid_t pid; 186 kuid_t uid; 187 char comm[TASK_COMM_LEN]; 188 189 #ifdef CONFIG_FUNCTION_TRACER 190 int ftrace_ignore_pid; 191 #endif 192 bool ignore_pid; 193 }; 194 195 struct tracer; 196 struct trace_option_dentry; 197 198 struct array_buffer { 199 struct trace_array *tr; 200 struct trace_buffer *buffer; 201 struct trace_array_cpu __percpu *data; 202 u64 time_start; 203 int cpu; 204 }; 205 206 #define TRACE_FLAGS_MAX_SIZE 32 207 208 struct trace_options { 209 struct tracer *tracer; 210 struct trace_option_dentry *topts; 211 }; 212 213 struct trace_pid_list *trace_pid_list_alloc(void); 214 void trace_pid_list_free(struct trace_pid_list *pid_list); 215 bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid); 216 int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid); 217 int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid); 218 int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid); 219 int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid, 220 unsigned int *next); 221 222 enum { 223 TRACE_PIDS = BIT(0), 224 TRACE_NO_PIDS = BIT(1), 225 }; 226 227 static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, 228 struct trace_pid_list *no_pid_list) 229 { 230 /* Return true if the pid list in type has pids */ 231 return ((type & TRACE_PIDS) && pid_list) || 232 ((type & TRACE_NO_PIDS) && no_pid_list); 233 } 234 235 static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, 236 struct trace_pid_list *no_pid_list) 237 { 238 /* 239 * Turning off what is in @type, return true if the "other" 240 * pid list, still has pids in it. 241 */ 242 return (!(type & TRACE_PIDS) && pid_list) || 243 (!(type & TRACE_NO_PIDS) && no_pid_list); 244 } 245 246 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 247 248 /** 249 * struct cond_snapshot - conditional snapshot data and callback 250 * 251 * The cond_snapshot structure encapsulates a callback function and 252 * data associated with the snapshot for a given tracing instance. 253 * 254 * When a snapshot is taken conditionally, by invoking 255 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 256 * passed in turn to the cond_snapshot.update() function. That data 257 * can be compared by the update() implementation with the cond_data 258 * contained within the struct cond_snapshot instance associated with 259 * the trace_array. Because the tr->max_lock is held throughout the 260 * update() call, the update() function can directly retrieve the 261 * cond_snapshot and cond_data associated with the per-instance 262 * snapshot associated with the trace_array. 263 * 264 * The cond_snapshot.update() implementation can save data to be 265 * associated with the snapshot if it decides to, and returns 'true' 266 * in that case, or it returns 'false' if the conditional snapshot 267 * shouldn't be taken. 268 * 269 * The cond_snapshot instance is created and associated with the 270 * user-defined cond_data by tracing_cond_snapshot_enable(). 271 * Likewise, the cond_snapshot instance is destroyed and is no longer 272 * associated with the trace instance by 273 * tracing_cond_snapshot_disable(). 274 * 275 * The method below is required. 276 * 277 * @update: When a conditional snapshot is invoked, the update() 278 * callback function is invoked with the tr->max_lock held. The 279 * update() implementation signals whether or not to actually 280 * take the snapshot, by returning 'true' if so, 'false' if no 281 * snapshot should be taken. Because the max_lock is held for 282 * the duration of update(), the implementation is safe to 283 * directly retrieved and save any implementation data it needs 284 * to in association with the snapshot. 285 */ 286 struct cond_snapshot { 287 void *cond_data; 288 cond_update_fn_t update; 289 }; 290 291 /* 292 * struct trace_func_repeats - used to keep track of the consecutive 293 * (on the same CPU) calls of a single function. 294 */ 295 struct trace_func_repeats { 296 unsigned long ip; 297 unsigned long parent_ip; 298 unsigned long count; 299 u64 ts_last_call; 300 }; 301 302 /* 303 * The trace array - an array of per-CPU trace arrays. This is the 304 * highest level data structure that individual tracers deal with. 305 * They have on/off state as well: 306 */ 307 struct trace_array { 308 struct list_head list; 309 char *name; 310 struct array_buffer array_buffer; 311 #ifdef CONFIG_TRACER_MAX_TRACE 312 /* 313 * The max_buffer is used to snapshot the trace when a maximum 314 * latency is reached, or when the user initiates a snapshot. 315 * Some tracers will use this to store a maximum trace while 316 * it continues examining live traces. 317 * 318 * The buffers for the max_buffer are set up the same as the array_buffer 319 * When a snapshot is taken, the buffer of the max_buffer is swapped 320 * with the buffer of the array_buffer and the buffers are reset for 321 * the array_buffer so the tracing can continue. 322 */ 323 struct array_buffer max_buffer; 324 bool allocated_snapshot; 325 #endif 326 #ifdef CONFIG_TRACER_MAX_TRACE 327 unsigned long max_latency; 328 #ifdef CONFIG_FSNOTIFY 329 struct dentry *d_max_latency; 330 struct work_struct fsnotify_work; 331 struct irq_work fsnotify_irqwork; 332 #endif 333 #endif 334 struct trace_pid_list __rcu *filtered_pids; 335 struct trace_pid_list __rcu *filtered_no_pids; 336 /* 337 * max_lock is used to protect the swapping of buffers 338 * when taking a max snapshot. The buffers themselves are 339 * protected by per_cpu spinlocks. But the action of the swap 340 * needs its own lock. 341 * 342 * This is defined as a arch_spinlock_t in order to help 343 * with performance when lockdep debugging is enabled. 344 * 345 * It is also used in other places outside the update_max_tr 346 * so it needs to be defined outside of the 347 * CONFIG_TRACER_MAX_TRACE. 348 */ 349 arch_spinlock_t max_lock; 350 int buffer_disabled; 351 #ifdef CONFIG_FTRACE_SYSCALLS 352 int sys_refcount_enter; 353 int sys_refcount_exit; 354 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 355 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 356 #endif 357 int stop_count; 358 int clock_id; 359 int nr_topts; 360 bool clear_trace; 361 int buffer_percent; 362 unsigned int n_err_log_entries; 363 struct tracer *current_trace; 364 unsigned int trace_flags; 365 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 366 unsigned int flags; 367 raw_spinlock_t start_lock; 368 struct list_head err_log; 369 struct dentry *dir; 370 struct dentry *options; 371 struct dentry *percpu_dir; 372 struct dentry *event_dir; 373 struct trace_options *topts; 374 struct list_head systems; 375 struct list_head events; 376 struct trace_event_file *trace_marker_file; 377 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 378 int ref; 379 int trace_ref; 380 #ifdef CONFIG_FUNCTION_TRACER 381 struct ftrace_ops *ops; 382 struct trace_pid_list __rcu *function_pids; 383 struct trace_pid_list __rcu *function_no_pids; 384 #ifdef CONFIG_DYNAMIC_FTRACE 385 /* All of these are protected by the ftrace_lock */ 386 struct list_head func_probes; 387 struct list_head mod_trace; 388 struct list_head mod_notrace; 389 #endif 390 /* function tracing enabled */ 391 int function_enabled; 392 #endif 393 int no_filter_buffering_ref; 394 struct list_head hist_vars; 395 #ifdef CONFIG_TRACER_SNAPSHOT 396 struct cond_snapshot *cond_snapshot; 397 #endif 398 struct trace_func_repeats __percpu *last_func_repeats; 399 }; 400 401 enum { 402 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 403 }; 404 405 extern struct list_head ftrace_trace_arrays; 406 407 extern struct mutex trace_types_lock; 408 409 extern int trace_array_get(struct trace_array *tr); 410 extern int tracing_check_open_get_tr(struct trace_array *tr); 411 extern struct trace_array *trace_array_find(const char *instance); 412 extern struct trace_array *trace_array_find_get(const char *instance); 413 414 extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe); 415 extern int tracing_set_filter_buffering(struct trace_array *tr, bool set); 416 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 417 418 extern bool trace_clock_in_ns(struct trace_array *tr); 419 420 /* 421 * The global tracer (top) should be the first trace array added, 422 * but we check the flag anyway. 423 */ 424 static inline struct trace_array *top_trace_array(void) 425 { 426 struct trace_array *tr; 427 428 if (list_empty(&ftrace_trace_arrays)) 429 return NULL; 430 431 tr = list_entry(ftrace_trace_arrays.prev, 432 typeof(*tr), list); 433 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 434 return tr; 435 } 436 437 #define FTRACE_CMP_TYPE(var, type) \ 438 __builtin_types_compatible_p(typeof(var), type *) 439 440 #undef IF_ASSIGN 441 #define IF_ASSIGN(var, entry, etype, id) \ 442 if (FTRACE_CMP_TYPE(var, etype)) { \ 443 var = (typeof(var))(entry); \ 444 WARN_ON(id != 0 && (entry)->type != id); \ 445 break; \ 446 } 447 448 /* Will cause compile errors if type is not found. */ 449 extern void __ftrace_bad_type(void); 450 451 /* 452 * The trace_assign_type is a verifier that the entry type is 453 * the same as the type being assigned. To add new types simply 454 * add a line with the following format: 455 * 456 * IF_ASSIGN(var, ent, type, id); 457 * 458 * Where "type" is the trace type that includes the trace_entry 459 * as the "ent" item. And "id" is the trace identifier that is 460 * used in the trace_type enum. 461 * 462 * If the type can have more than one id, then use zero. 463 */ 464 #define trace_assign_type(var, ent) \ 465 do { \ 466 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 467 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 468 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 469 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 470 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 471 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 472 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 473 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 474 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\ 475 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\ 476 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 477 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 478 TRACE_MMIO_RW); \ 479 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 480 TRACE_MMIO_MAP); \ 481 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 482 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 483 TRACE_GRAPH_ENT); \ 484 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 485 TRACE_GRAPH_RET); \ 486 IF_ASSIGN(var, ent, struct func_repeats_entry, \ 487 TRACE_FUNC_REPEATS); \ 488 __ftrace_bad_type(); \ 489 } while (0) 490 491 /* 492 * An option specific to a tracer. This is a boolean value. 493 * The bit is the bit index that sets its value on the 494 * flags value in struct tracer_flags. 495 */ 496 struct tracer_opt { 497 const char *name; /* Will appear on the trace_options file */ 498 u32 bit; /* Mask assigned in val field in tracer_flags */ 499 }; 500 501 /* 502 * The set of specific options for a tracer. Your tracer 503 * have to set the initial value of the flags val. 504 */ 505 struct tracer_flags { 506 u32 val; 507 struct tracer_opt *opts; 508 struct tracer *trace; 509 }; 510 511 /* Makes more easy to define a tracer opt */ 512 #define TRACER_OPT(s, b) .name = #s, .bit = b 513 514 515 struct trace_option_dentry { 516 struct tracer_opt *opt; 517 struct tracer_flags *flags; 518 struct trace_array *tr; 519 struct dentry *entry; 520 }; 521 522 /** 523 * struct tracer - a specific tracer and its callbacks to interact with tracefs 524 * @name: the name chosen to select it on the available_tracers file 525 * @init: called when one switches to this tracer (echo name > current_tracer) 526 * @reset: called when one switches to another tracer 527 * @start: called when tracing is unpaused (echo 1 > tracing_on) 528 * @stop: called when tracing is paused (echo 0 > tracing_on) 529 * @update_thresh: called when tracing_thresh is updated 530 * @open: called when the trace file is opened 531 * @pipe_open: called when the trace_pipe file is opened 532 * @close: called when the trace file is released 533 * @pipe_close: called when the trace_pipe file is released 534 * @read: override the default read callback on trace_pipe 535 * @splice_read: override the default splice_read callback on trace_pipe 536 * @selftest: selftest to run on boot (see trace_selftest.c) 537 * @print_headers: override the first lines that describe your columns 538 * @print_line: callback that prints a trace 539 * @set_flag: signals one of your private flags changed (trace_options file) 540 * @flags: your private flags 541 */ 542 struct tracer { 543 const char *name; 544 int (*init)(struct trace_array *tr); 545 void (*reset)(struct trace_array *tr); 546 void (*start)(struct trace_array *tr); 547 void (*stop)(struct trace_array *tr); 548 int (*update_thresh)(struct trace_array *tr); 549 void (*open)(struct trace_iterator *iter); 550 void (*pipe_open)(struct trace_iterator *iter); 551 void (*close)(struct trace_iterator *iter); 552 void (*pipe_close)(struct trace_iterator *iter); 553 ssize_t (*read)(struct trace_iterator *iter, 554 struct file *filp, char __user *ubuf, 555 size_t cnt, loff_t *ppos); 556 ssize_t (*splice_read)(struct trace_iterator *iter, 557 struct file *filp, 558 loff_t *ppos, 559 struct pipe_inode_info *pipe, 560 size_t len, 561 unsigned int flags); 562 #ifdef CONFIG_FTRACE_STARTUP_TEST 563 int (*selftest)(struct tracer *trace, 564 struct trace_array *tr); 565 #endif 566 void (*print_header)(struct seq_file *m); 567 enum print_line_t (*print_line)(struct trace_iterator *iter); 568 /* If you handled the flag setting, return 0 */ 569 int (*set_flag)(struct trace_array *tr, 570 u32 old_flags, u32 bit, int set); 571 /* Return 0 if OK with change, else return non-zero */ 572 int (*flag_changed)(struct trace_array *tr, 573 u32 mask, int set); 574 struct tracer *next; 575 struct tracer_flags *flags; 576 int enabled; 577 bool print_max; 578 bool allow_instances; 579 #ifdef CONFIG_TRACER_MAX_TRACE 580 bool use_max_tr; 581 #endif 582 /* True if tracer cannot be enabled in kernel param */ 583 bool noboot; 584 }; 585 586 static inline struct ring_buffer_iter * 587 trace_buffer_iter(struct trace_iterator *iter, int cpu) 588 { 589 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 590 } 591 592 int tracer_init(struct tracer *t, struct trace_array *tr); 593 int tracing_is_enabled(void); 594 void tracing_reset_online_cpus(struct array_buffer *buf); 595 void tracing_reset_current(int cpu); 596 void tracing_reset_all_online_cpus(void); 597 void tracing_reset_all_online_cpus_unlocked(void); 598 int tracing_open_generic(struct inode *inode, struct file *filp); 599 int tracing_open_generic_tr(struct inode *inode, struct file *filp); 600 bool tracing_is_disabled(void); 601 bool tracer_tracing_is_on(struct trace_array *tr); 602 void tracer_tracing_on(struct trace_array *tr); 603 void tracer_tracing_off(struct trace_array *tr); 604 struct dentry *trace_create_file(const char *name, 605 umode_t mode, 606 struct dentry *parent, 607 void *data, 608 const struct file_operations *fops); 609 610 int tracing_init_dentry(void); 611 612 struct ring_buffer_event; 613 614 struct ring_buffer_event * 615 trace_buffer_lock_reserve(struct trace_buffer *buffer, 616 int type, 617 unsigned long len, 618 unsigned int trace_ctx); 619 620 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 621 struct trace_array_cpu *data); 622 623 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 624 int *ent_cpu, u64 *ent_ts); 625 626 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, 627 struct ring_buffer_event *event); 628 629 bool trace_is_tracepoint_string(const char *str); 630 const char *trace_event_format(struct trace_iterator *iter, const char *fmt); 631 void trace_check_vprintf(struct trace_iterator *iter, const char *fmt, 632 va_list ap) __printf(2, 0); 633 char *trace_iter_expand_format(struct trace_iterator *iter); 634 635 int trace_empty(struct trace_iterator *iter); 636 637 void *trace_find_next_entry_inc(struct trace_iterator *iter); 638 639 void trace_init_global_iter(struct trace_iterator *iter); 640 641 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 642 643 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 644 unsigned long trace_total_entries(struct trace_array *tr); 645 646 void trace_function(struct trace_array *tr, 647 unsigned long ip, 648 unsigned long parent_ip, 649 unsigned int trace_ctx); 650 void trace_graph_function(struct trace_array *tr, 651 unsigned long ip, 652 unsigned long parent_ip, 653 unsigned int trace_ctx); 654 void trace_latency_header(struct seq_file *m); 655 void trace_default_header(struct seq_file *m); 656 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 657 658 void trace_graph_return(struct ftrace_graph_ret *trace); 659 int trace_graph_entry(struct ftrace_graph_ent *trace); 660 void set_graph_array(struct trace_array *tr); 661 662 void tracing_start_cmdline_record(void); 663 void tracing_stop_cmdline_record(void); 664 void tracing_start_tgid_record(void); 665 void tracing_stop_tgid_record(void); 666 667 int register_tracer(struct tracer *type); 668 int is_tracing_stopped(void); 669 670 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 671 672 extern cpumask_var_t __read_mostly tracing_buffer_mask; 673 674 #define for_each_tracing_cpu(cpu) \ 675 for_each_cpu(cpu, tracing_buffer_mask) 676 677 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 678 679 extern unsigned long tracing_thresh; 680 681 /* PID filtering */ 682 683 extern int pid_max; 684 685 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 686 pid_t search_pid); 687 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 688 struct trace_pid_list *filtered_no_pids, 689 struct task_struct *task); 690 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 691 struct task_struct *self, 692 struct task_struct *task); 693 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 694 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 695 int trace_pid_show(struct seq_file *m, void *v); 696 void trace_free_pid_list(struct trace_pid_list *pid_list); 697 int trace_pid_write(struct trace_pid_list *filtered_pids, 698 struct trace_pid_list **new_pid_list, 699 const char __user *ubuf, size_t cnt); 700 701 #ifdef CONFIG_TRACER_MAX_TRACE 702 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 703 void *cond_data); 704 void update_max_tr_single(struct trace_array *tr, 705 struct task_struct *tsk, int cpu); 706 707 #ifdef CONFIG_FSNOTIFY 708 #define LATENCY_FS_NOTIFY 709 #endif 710 #endif /* CONFIG_TRACER_MAX_TRACE */ 711 712 #ifdef LATENCY_FS_NOTIFY 713 void latency_fsnotify(struct trace_array *tr); 714 #else 715 static inline void latency_fsnotify(struct trace_array *tr) { } 716 #endif 717 718 #ifdef CONFIG_STACKTRACE 719 void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip); 720 #else 721 static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, 722 int skip) 723 { 724 } 725 #endif /* CONFIG_STACKTRACE */ 726 727 void trace_last_func_repeats(struct trace_array *tr, 728 struct trace_func_repeats *last_info, 729 unsigned int trace_ctx); 730 731 extern u64 ftrace_now(int cpu); 732 733 extern void trace_find_cmdline(int pid, char comm[]); 734 extern int trace_find_tgid(int pid); 735 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 736 737 #ifdef CONFIG_DYNAMIC_FTRACE 738 extern unsigned long ftrace_update_tot_cnt; 739 extern unsigned long ftrace_number_of_pages; 740 extern unsigned long ftrace_number_of_groups; 741 void ftrace_init_trace_array(struct trace_array *tr); 742 #else 743 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 744 #endif 745 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 746 extern int DYN_FTRACE_TEST_NAME(void); 747 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 748 extern int DYN_FTRACE_TEST_NAME2(void); 749 750 extern bool ring_buffer_expanded; 751 extern bool tracing_selftest_disabled; 752 753 #ifdef CONFIG_FTRACE_STARTUP_TEST 754 extern void __init disable_tracing_selftest(const char *reason); 755 756 extern int trace_selftest_startup_function(struct tracer *trace, 757 struct trace_array *tr); 758 extern int trace_selftest_startup_function_graph(struct tracer *trace, 759 struct trace_array *tr); 760 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 761 struct trace_array *tr); 762 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 763 struct trace_array *tr); 764 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 765 struct trace_array *tr); 766 extern int trace_selftest_startup_wakeup(struct tracer *trace, 767 struct trace_array *tr); 768 extern int trace_selftest_startup_nop(struct tracer *trace, 769 struct trace_array *tr); 770 extern int trace_selftest_startup_branch(struct tracer *trace, 771 struct trace_array *tr); 772 /* 773 * Tracer data references selftest functions that only occur 774 * on boot up. These can be __init functions. Thus, when selftests 775 * are enabled, then the tracers need to reference __init functions. 776 */ 777 #define __tracer_data __refdata 778 #else 779 static inline void __init disable_tracing_selftest(const char *reason) 780 { 781 } 782 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 783 #define __tracer_data __read_mostly 784 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 785 786 extern void *head_page(struct trace_array_cpu *data); 787 extern unsigned long long ns2usecs(u64 nsec); 788 extern int 789 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 790 extern int 791 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 792 extern int 793 trace_array_vprintk(struct trace_array *tr, 794 unsigned long ip, const char *fmt, va_list args); 795 int trace_array_printk_buf(struct trace_buffer *buffer, 796 unsigned long ip, const char *fmt, ...); 797 void trace_printk_seq(struct trace_seq *s); 798 enum print_line_t print_trace_line(struct trace_iterator *iter); 799 800 extern char trace_find_mark(unsigned long long duration); 801 802 struct ftrace_hash; 803 804 struct ftrace_mod_load { 805 struct list_head list; 806 char *func; 807 char *module; 808 int enable; 809 }; 810 811 enum { 812 FTRACE_HASH_FL_MOD = (1 << 0), 813 }; 814 815 struct ftrace_hash { 816 unsigned long size_bits; 817 struct hlist_head *buckets; 818 unsigned long count; 819 unsigned long flags; 820 struct rcu_head rcu; 821 }; 822 823 struct ftrace_func_entry * 824 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 825 826 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 827 { 828 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 829 } 830 831 /* Standard output formatting function used for function return traces */ 832 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 833 834 /* Flag options */ 835 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 836 #define TRACE_GRAPH_PRINT_CPU 0x2 837 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 838 #define TRACE_GRAPH_PRINT_PROC 0x8 839 #define TRACE_GRAPH_PRINT_DURATION 0x10 840 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 841 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 842 #define TRACE_GRAPH_PRINT_IRQS 0x80 843 #define TRACE_GRAPH_PRINT_TAIL 0x100 844 #define TRACE_GRAPH_SLEEP_TIME 0x200 845 #define TRACE_GRAPH_GRAPH_TIME 0x400 846 #define TRACE_GRAPH_PRINT_RETVAL 0x800 847 #define TRACE_GRAPH_PRINT_RETVAL_HEX 0x1000 848 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 849 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 850 851 extern void ftrace_graph_sleep_time_control(bool enable); 852 853 #ifdef CONFIG_FUNCTION_PROFILER 854 extern void ftrace_graph_graph_time_control(bool enable); 855 #else 856 static inline void ftrace_graph_graph_time_control(bool enable) { } 857 #endif 858 859 extern enum print_line_t 860 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 861 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 862 extern void 863 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 864 extern void graph_trace_open(struct trace_iterator *iter); 865 extern void graph_trace_close(struct trace_iterator *iter); 866 extern int __trace_graph_entry(struct trace_array *tr, 867 struct ftrace_graph_ent *trace, 868 unsigned int trace_ctx); 869 extern void __trace_graph_return(struct trace_array *tr, 870 struct ftrace_graph_ret *trace, 871 unsigned int trace_ctx); 872 873 #ifdef CONFIG_DYNAMIC_FTRACE 874 extern struct ftrace_hash __rcu *ftrace_graph_hash; 875 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; 876 877 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 878 { 879 unsigned long addr = trace->func; 880 int ret = 0; 881 struct ftrace_hash *hash; 882 883 preempt_disable_notrace(); 884 885 /* 886 * Have to open code "rcu_dereference_sched()" because the 887 * function graph tracer can be called when RCU is not 888 * "watching". 889 * Protected with schedule_on_each_cpu(ftrace_sync) 890 */ 891 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); 892 893 if (ftrace_hash_empty(hash)) { 894 ret = 1; 895 goto out; 896 } 897 898 if (ftrace_lookup_ip(hash, addr)) { 899 900 /* 901 * This needs to be cleared on the return functions 902 * when the depth is zero. 903 */ 904 trace_recursion_set(TRACE_GRAPH_BIT); 905 trace_recursion_set_depth(trace->depth); 906 907 /* 908 * If no irqs are to be traced, but a set_graph_function 909 * is set, and called by an interrupt handler, we still 910 * want to trace it. 911 */ 912 if (in_hardirq()) 913 trace_recursion_set(TRACE_IRQ_BIT); 914 else 915 trace_recursion_clear(TRACE_IRQ_BIT); 916 ret = 1; 917 } 918 919 out: 920 preempt_enable_notrace(); 921 return ret; 922 } 923 924 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 925 { 926 if (trace_recursion_test(TRACE_GRAPH_BIT) && 927 trace->depth == trace_recursion_depth()) 928 trace_recursion_clear(TRACE_GRAPH_BIT); 929 } 930 931 static inline int ftrace_graph_notrace_addr(unsigned long addr) 932 { 933 int ret = 0; 934 struct ftrace_hash *notrace_hash; 935 936 preempt_disable_notrace(); 937 938 /* 939 * Have to open code "rcu_dereference_sched()" because the 940 * function graph tracer can be called when RCU is not 941 * "watching". 942 * Protected with schedule_on_each_cpu(ftrace_sync) 943 */ 944 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, 945 !preemptible()); 946 947 if (ftrace_lookup_ip(notrace_hash, addr)) 948 ret = 1; 949 950 preempt_enable_notrace(); 951 return ret; 952 } 953 #else 954 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 955 { 956 return 1; 957 } 958 959 static inline int ftrace_graph_notrace_addr(unsigned long addr) 960 { 961 return 0; 962 } 963 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 964 { } 965 #endif /* CONFIG_DYNAMIC_FTRACE */ 966 967 extern unsigned int fgraph_max_depth; 968 969 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 970 { 971 /* trace it when it is-nested-in or is a function enabled. */ 972 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 973 ftrace_graph_addr(trace)) || 974 (trace->depth < 0) || 975 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 976 } 977 978 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 979 static inline enum print_line_t 980 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 981 { 982 return TRACE_TYPE_UNHANDLED; 983 } 984 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 985 986 extern struct list_head ftrace_pids; 987 988 #ifdef CONFIG_FUNCTION_TRACER 989 990 #define FTRACE_PID_IGNORE -1 991 #define FTRACE_PID_TRACE -2 992 993 struct ftrace_func_command { 994 struct list_head list; 995 char *name; 996 int (*func)(struct trace_array *tr, 997 struct ftrace_hash *hash, 998 char *func, char *cmd, 999 char *params, int enable); 1000 }; 1001 extern bool ftrace_filter_param __initdata; 1002 static inline int ftrace_trace_task(struct trace_array *tr) 1003 { 1004 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) != 1005 FTRACE_PID_IGNORE; 1006 } 1007 extern int ftrace_is_dead(void); 1008 int ftrace_create_function_files(struct trace_array *tr, 1009 struct dentry *parent); 1010 void ftrace_destroy_function_files(struct trace_array *tr); 1011 int ftrace_allocate_ftrace_ops(struct trace_array *tr); 1012 void ftrace_free_ftrace_ops(struct trace_array *tr); 1013 void ftrace_init_global_array_ops(struct trace_array *tr); 1014 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 1015 void ftrace_reset_array_ops(struct trace_array *tr); 1016 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 1017 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1018 struct dentry *d_tracer); 1019 void ftrace_clear_pids(struct trace_array *tr); 1020 int init_function_trace(void); 1021 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1022 #else 1023 static inline int ftrace_trace_task(struct trace_array *tr) 1024 { 1025 return 1; 1026 } 1027 static inline int ftrace_is_dead(void) { return 0; } 1028 static inline int 1029 ftrace_create_function_files(struct trace_array *tr, 1030 struct dentry *parent) 1031 { 1032 return 0; 1033 } 1034 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) 1035 { 1036 return 0; 1037 } 1038 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } 1039 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1040 static inline __init void 1041 ftrace_init_global_array_ops(struct trace_array *tr) { } 1042 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1043 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1044 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1045 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1046 static inline int init_function_trace(void) { return 0; } 1047 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1048 /* ftace_func_t type is not defined, use macro instead of static inline */ 1049 #define ftrace_init_array_ops(tr, func) do { } while (0) 1050 #endif /* CONFIG_FUNCTION_TRACER */ 1051 1052 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1053 1054 struct ftrace_probe_ops { 1055 void (*func)(unsigned long ip, 1056 unsigned long parent_ip, 1057 struct trace_array *tr, 1058 struct ftrace_probe_ops *ops, 1059 void *data); 1060 int (*init)(struct ftrace_probe_ops *ops, 1061 struct trace_array *tr, 1062 unsigned long ip, void *init_data, 1063 void **data); 1064 void (*free)(struct ftrace_probe_ops *ops, 1065 struct trace_array *tr, 1066 unsigned long ip, void *data); 1067 int (*print)(struct seq_file *m, 1068 unsigned long ip, 1069 struct ftrace_probe_ops *ops, 1070 void *data); 1071 }; 1072 1073 struct ftrace_func_mapper; 1074 typedef int (*ftrace_mapper_func)(void *data); 1075 1076 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1077 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1078 unsigned long ip); 1079 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1080 unsigned long ip, void *data); 1081 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1082 unsigned long ip); 1083 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1084 ftrace_mapper_func free_func); 1085 1086 extern int 1087 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1088 struct ftrace_probe_ops *ops, void *data); 1089 extern int 1090 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1091 struct ftrace_probe_ops *ops); 1092 extern void clear_ftrace_function_probes(struct trace_array *tr); 1093 1094 int register_ftrace_command(struct ftrace_func_command *cmd); 1095 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1096 1097 void ftrace_create_filter_files(struct ftrace_ops *ops, 1098 struct dentry *parent); 1099 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1100 1101 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, 1102 int len, int reset); 1103 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, 1104 int len, int reset); 1105 #else 1106 struct ftrace_func_command; 1107 1108 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1109 { 1110 return -EINVAL; 1111 } 1112 static inline __init int unregister_ftrace_command(char *cmd_name) 1113 { 1114 return -EINVAL; 1115 } 1116 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1117 { 1118 } 1119 1120 /* 1121 * The ops parameter passed in is usually undefined. 1122 * This must be a macro. 1123 */ 1124 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1125 #define ftrace_destroy_filter_files(ops) do { } while (0) 1126 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1127 1128 bool ftrace_event_is_function(struct trace_event_call *call); 1129 1130 /* 1131 * struct trace_parser - servers for reading the user input separated by spaces 1132 * @cont: set if the input is not complete - no final space char was found 1133 * @buffer: holds the parsed user input 1134 * @idx: user input length 1135 * @size: buffer size 1136 */ 1137 struct trace_parser { 1138 bool cont; 1139 char *buffer; 1140 unsigned idx; 1141 unsigned size; 1142 }; 1143 1144 static inline bool trace_parser_loaded(struct trace_parser *parser) 1145 { 1146 return (parser->idx != 0); 1147 } 1148 1149 static inline bool trace_parser_cont(struct trace_parser *parser) 1150 { 1151 return parser->cont; 1152 } 1153 1154 static inline void trace_parser_clear(struct trace_parser *parser) 1155 { 1156 parser->cont = false; 1157 parser->idx = 0; 1158 } 1159 1160 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1161 extern void trace_parser_put(struct trace_parser *parser); 1162 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1163 size_t cnt, loff_t *ppos); 1164 1165 /* 1166 * Only create function graph options if function graph is configured. 1167 */ 1168 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1169 # define FGRAPH_FLAGS \ 1170 C(DISPLAY_GRAPH, "display-graph"), 1171 #else 1172 # define FGRAPH_FLAGS 1173 #endif 1174 1175 #ifdef CONFIG_BRANCH_TRACER 1176 # define BRANCH_FLAGS \ 1177 C(BRANCH, "branch"), 1178 #else 1179 # define BRANCH_FLAGS 1180 #endif 1181 1182 #ifdef CONFIG_FUNCTION_TRACER 1183 # define FUNCTION_FLAGS \ 1184 C(FUNCTION, "function-trace"), \ 1185 C(FUNC_FORK, "function-fork"), 1186 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1187 #else 1188 # define FUNCTION_FLAGS 1189 # define FUNCTION_DEFAULT_FLAGS 0UL 1190 # define TRACE_ITER_FUNC_FORK 0UL 1191 #endif 1192 1193 #ifdef CONFIG_STACKTRACE 1194 # define STACK_FLAGS \ 1195 C(STACKTRACE, "stacktrace"), 1196 #else 1197 # define STACK_FLAGS 1198 #endif 1199 1200 /* 1201 * trace_iterator_flags is an enumeration that defines bit 1202 * positions into trace_flags that controls the output. 1203 * 1204 * NOTE: These bits must match the trace_options array in 1205 * trace.c (this macro guarantees it). 1206 */ 1207 #define TRACE_FLAGS \ 1208 C(PRINT_PARENT, "print-parent"), \ 1209 C(SYM_OFFSET, "sym-offset"), \ 1210 C(SYM_ADDR, "sym-addr"), \ 1211 C(VERBOSE, "verbose"), \ 1212 C(RAW, "raw"), \ 1213 C(HEX, "hex"), \ 1214 C(BIN, "bin"), \ 1215 C(BLOCK, "block"), \ 1216 C(FIELDS, "fields"), \ 1217 C(PRINTK, "trace_printk"), \ 1218 C(ANNOTATE, "annotate"), \ 1219 C(USERSTACKTRACE, "userstacktrace"), \ 1220 C(SYM_USEROBJ, "sym-userobj"), \ 1221 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1222 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1223 C(LATENCY_FMT, "latency-format"), \ 1224 C(RECORD_CMD, "record-cmd"), \ 1225 C(RECORD_TGID, "record-tgid"), \ 1226 C(OVERWRITE, "overwrite"), \ 1227 C(STOP_ON_FREE, "disable_on_free"), \ 1228 C(IRQ_INFO, "irq-info"), \ 1229 C(MARKERS, "markers"), \ 1230 C(EVENT_FORK, "event-fork"), \ 1231 C(PAUSE_ON_TRACE, "pause-on-trace"), \ 1232 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \ 1233 FUNCTION_FLAGS \ 1234 FGRAPH_FLAGS \ 1235 STACK_FLAGS \ 1236 BRANCH_FLAGS 1237 1238 /* 1239 * By defining C, we can make TRACE_FLAGS a list of bit names 1240 * that will define the bits for the flag masks. 1241 */ 1242 #undef C 1243 #define C(a, b) TRACE_ITER_##a##_BIT 1244 1245 enum trace_iterator_bits { 1246 TRACE_FLAGS 1247 /* Make sure we don't go more than we have bits for */ 1248 TRACE_ITER_LAST_BIT 1249 }; 1250 1251 /* 1252 * By redefining C, we can make TRACE_FLAGS a list of masks that 1253 * use the bits as defined above. 1254 */ 1255 #undef C 1256 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1257 1258 enum trace_iterator_flags { TRACE_FLAGS }; 1259 1260 /* 1261 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1262 * control the output of kernel symbols. 1263 */ 1264 #define TRACE_ITER_SYM_MASK \ 1265 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1266 1267 extern struct tracer nop_trace; 1268 1269 #ifdef CONFIG_BRANCH_TRACER 1270 extern int enable_branch_tracing(struct trace_array *tr); 1271 extern void disable_branch_tracing(void); 1272 static inline int trace_branch_enable(struct trace_array *tr) 1273 { 1274 if (tr->trace_flags & TRACE_ITER_BRANCH) 1275 return enable_branch_tracing(tr); 1276 return 0; 1277 } 1278 static inline void trace_branch_disable(void) 1279 { 1280 /* due to races, always disable */ 1281 disable_branch_tracing(); 1282 } 1283 #else 1284 static inline int trace_branch_enable(struct trace_array *tr) 1285 { 1286 return 0; 1287 } 1288 static inline void trace_branch_disable(void) 1289 { 1290 } 1291 #endif /* CONFIG_BRANCH_TRACER */ 1292 1293 /* set ring buffers to default size if not already done so */ 1294 int tracing_update_buffers(void); 1295 1296 struct ftrace_event_field { 1297 struct list_head link; 1298 const char *name; 1299 const char *type; 1300 int filter_type; 1301 int offset; 1302 int size; 1303 int is_signed; 1304 int len; 1305 }; 1306 1307 struct prog_entry; 1308 1309 struct event_filter { 1310 struct prog_entry __rcu *prog; 1311 char *filter_string; 1312 }; 1313 1314 struct event_subsystem { 1315 struct list_head list; 1316 const char *name; 1317 struct event_filter *filter; 1318 int ref_count; 1319 }; 1320 1321 struct trace_subsystem_dir { 1322 struct list_head list; 1323 struct event_subsystem *subsystem; 1324 struct trace_array *tr; 1325 struct dentry *entry; 1326 int ref_count; 1327 int nr_events; 1328 }; 1329 1330 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1331 struct trace_buffer *buffer, 1332 struct ring_buffer_event *event); 1333 1334 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1335 struct trace_buffer *buffer, 1336 struct ring_buffer_event *event, 1337 unsigned int trcace_ctx, 1338 struct pt_regs *regs); 1339 1340 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1341 struct trace_buffer *buffer, 1342 struct ring_buffer_event *event, 1343 unsigned int trace_ctx) 1344 { 1345 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL); 1346 } 1347 1348 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1349 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1350 void trace_buffered_event_disable(void); 1351 void trace_buffered_event_enable(void); 1352 1353 void early_enable_events(struct trace_array *tr, char *buf, bool disable_first); 1354 1355 static inline void 1356 __trace_event_discard_commit(struct trace_buffer *buffer, 1357 struct ring_buffer_event *event) 1358 { 1359 if (this_cpu_read(trace_buffered_event) == event) { 1360 /* Simply release the temp buffer and enable preemption */ 1361 this_cpu_dec(trace_buffered_event_cnt); 1362 preempt_enable_notrace(); 1363 return; 1364 } 1365 /* ring_buffer_discard_commit() enables preemption */ 1366 ring_buffer_discard_commit(buffer, event); 1367 } 1368 1369 /* 1370 * Helper function for event_trigger_unlock_commit{_regs}(). 1371 * If there are event triggers attached to this event that requires 1372 * filtering against its fields, then they will be called as the 1373 * entry already holds the field information of the current event. 1374 * 1375 * It also checks if the event should be discarded or not. 1376 * It is to be discarded if the event is soft disabled and the 1377 * event was only recorded to process triggers, or if the event 1378 * filter is active and this event did not match the filters. 1379 * 1380 * Returns true if the event is discarded, false otherwise. 1381 */ 1382 static inline bool 1383 __event_trigger_test_discard(struct trace_event_file *file, 1384 struct trace_buffer *buffer, 1385 struct ring_buffer_event *event, 1386 void *entry, 1387 enum event_trigger_type *tt) 1388 { 1389 unsigned long eflags = file->flags; 1390 1391 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1392 *tt = event_triggers_call(file, buffer, entry, event); 1393 1394 if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED | 1395 EVENT_FILE_FL_FILTERED | 1396 EVENT_FILE_FL_PID_FILTER)))) 1397 return false; 1398 1399 if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) 1400 goto discard; 1401 1402 if (file->flags & EVENT_FILE_FL_FILTERED && 1403 !filter_match_preds(file->filter, entry)) 1404 goto discard; 1405 1406 if ((file->flags & EVENT_FILE_FL_PID_FILTER) && 1407 trace_event_ignore_this_pid(file)) 1408 goto discard; 1409 1410 return false; 1411 discard: 1412 __trace_event_discard_commit(buffer, event); 1413 return true; 1414 } 1415 1416 /** 1417 * event_trigger_unlock_commit - handle triggers and finish event commit 1418 * @file: The file pointer associated with the event 1419 * @buffer: The ring buffer that the event is being written to 1420 * @event: The event meta data in the ring buffer 1421 * @entry: The event itself 1422 * @trace_ctx: The tracing context flags. 1423 * 1424 * This is a helper function to handle triggers that require data 1425 * from the event itself. It also tests the event against filters and 1426 * if the event is soft disabled and should be discarded. 1427 */ 1428 static inline void 1429 event_trigger_unlock_commit(struct trace_event_file *file, 1430 struct trace_buffer *buffer, 1431 struct ring_buffer_event *event, 1432 void *entry, unsigned int trace_ctx) 1433 { 1434 enum event_trigger_type tt = ETT_NONE; 1435 1436 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1437 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx); 1438 1439 if (tt) 1440 event_triggers_post_call(file, tt); 1441 } 1442 1443 #define FILTER_PRED_INVALID ((unsigned short)-1) 1444 #define FILTER_PRED_IS_RIGHT (1 << 15) 1445 #define FILTER_PRED_FOLD (1 << 15) 1446 1447 /* 1448 * The max preds is the size of unsigned short with 1449 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1450 * and FOLD flags. The other is reserved. 1451 * 1452 * 2^14 preds is way more than enough. 1453 */ 1454 #define MAX_FILTER_PRED 16384 1455 1456 struct filter_pred; 1457 struct regex; 1458 1459 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1460 1461 enum regex_type { 1462 MATCH_FULL = 0, 1463 MATCH_FRONT_ONLY, 1464 MATCH_MIDDLE_ONLY, 1465 MATCH_END_ONLY, 1466 MATCH_GLOB, 1467 MATCH_INDEX, 1468 }; 1469 1470 struct regex { 1471 char pattern[MAX_FILTER_STR_VAL]; 1472 int len; 1473 int field_len; 1474 regex_match_func match; 1475 }; 1476 1477 static inline bool is_string_field(struct ftrace_event_field *field) 1478 { 1479 return field->filter_type == FILTER_DYN_STRING || 1480 field->filter_type == FILTER_RDYN_STRING || 1481 field->filter_type == FILTER_STATIC_STRING || 1482 field->filter_type == FILTER_PTR_STRING || 1483 field->filter_type == FILTER_COMM; 1484 } 1485 1486 static inline bool is_function_field(struct ftrace_event_field *field) 1487 { 1488 return field->filter_type == FILTER_TRACE_FN; 1489 } 1490 1491 extern enum regex_type 1492 filter_parse_regex(char *buff, int len, char **search, int *not); 1493 extern void print_event_filter(struct trace_event_file *file, 1494 struct trace_seq *s); 1495 extern int apply_event_filter(struct trace_event_file *file, 1496 char *filter_string); 1497 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1498 char *filter_string); 1499 extern void print_subsystem_event_filter(struct event_subsystem *system, 1500 struct trace_seq *s); 1501 extern int filter_assign_type(const char *type); 1502 extern int create_event_filter(struct trace_array *tr, 1503 struct trace_event_call *call, 1504 char *filter_str, bool set_str, 1505 struct event_filter **filterp); 1506 extern void free_event_filter(struct event_filter *filter); 1507 1508 struct ftrace_event_field * 1509 trace_find_event_field(struct trace_event_call *call, char *name); 1510 1511 extern void trace_event_enable_cmd_record(bool enable); 1512 extern void trace_event_enable_tgid_record(bool enable); 1513 1514 extern int event_trace_init(void); 1515 extern int init_events(void); 1516 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1517 extern int event_trace_del_tracer(struct trace_array *tr); 1518 extern void __trace_early_add_events(struct trace_array *tr); 1519 1520 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1521 const char *system, 1522 const char *event); 1523 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1524 const char *system, 1525 const char *event); 1526 1527 static inline void *event_file_data(struct file *filp) 1528 { 1529 return READ_ONCE(file_inode(filp)->i_private); 1530 } 1531 1532 extern struct mutex event_mutex; 1533 extern struct list_head ftrace_events; 1534 1535 extern const struct file_operations event_trigger_fops; 1536 extern const struct file_operations event_hist_fops; 1537 extern const struct file_operations event_hist_debug_fops; 1538 extern const struct file_operations event_inject_fops; 1539 1540 #ifdef CONFIG_HIST_TRIGGERS 1541 extern int register_trigger_hist_cmd(void); 1542 extern int register_trigger_hist_enable_disable_cmds(void); 1543 #else 1544 static inline int register_trigger_hist_cmd(void) { return 0; } 1545 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1546 #endif 1547 1548 extern int register_trigger_cmds(void); 1549 extern void clear_event_triggers(struct trace_array *tr); 1550 1551 enum { 1552 EVENT_TRIGGER_FL_PROBE = BIT(0), 1553 }; 1554 1555 struct event_trigger_data { 1556 unsigned long count; 1557 int ref; 1558 int flags; 1559 struct event_trigger_ops *ops; 1560 struct event_command *cmd_ops; 1561 struct event_filter __rcu *filter; 1562 char *filter_str; 1563 void *private_data; 1564 bool paused; 1565 bool paused_tmp; 1566 struct list_head list; 1567 char *name; 1568 struct list_head named_list; 1569 struct event_trigger_data *named_data; 1570 }; 1571 1572 /* Avoid typos */ 1573 #define ENABLE_EVENT_STR "enable_event" 1574 #define DISABLE_EVENT_STR "disable_event" 1575 #define ENABLE_HIST_STR "enable_hist" 1576 #define DISABLE_HIST_STR "disable_hist" 1577 1578 struct enable_trigger_data { 1579 struct trace_event_file *file; 1580 bool enable; 1581 bool hist; 1582 }; 1583 1584 extern int event_enable_trigger_print(struct seq_file *m, 1585 struct event_trigger_data *data); 1586 extern void event_enable_trigger_free(struct event_trigger_data *data); 1587 extern int event_enable_trigger_parse(struct event_command *cmd_ops, 1588 struct trace_event_file *file, 1589 char *glob, char *cmd, 1590 char *param_and_filter); 1591 extern int event_enable_register_trigger(char *glob, 1592 struct event_trigger_data *data, 1593 struct trace_event_file *file); 1594 extern void event_enable_unregister_trigger(char *glob, 1595 struct event_trigger_data *test, 1596 struct trace_event_file *file); 1597 extern void trigger_data_free(struct event_trigger_data *data); 1598 extern int event_trigger_init(struct event_trigger_data *data); 1599 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1600 int trigger_enable); 1601 extern void update_cond_flag(struct trace_event_file *file); 1602 extern int set_trigger_filter(char *filter_str, 1603 struct event_trigger_data *trigger_data, 1604 struct trace_event_file *file); 1605 extern struct event_trigger_data *find_named_trigger(const char *name); 1606 extern bool is_named_trigger(struct event_trigger_data *test); 1607 extern int save_named_trigger(const char *name, 1608 struct event_trigger_data *data); 1609 extern void del_named_trigger(struct event_trigger_data *data); 1610 extern void pause_named_trigger(struct event_trigger_data *data); 1611 extern void unpause_named_trigger(struct event_trigger_data *data); 1612 extern void set_named_trigger_data(struct event_trigger_data *data, 1613 struct event_trigger_data *named_data); 1614 extern struct event_trigger_data * 1615 get_named_trigger_data(struct event_trigger_data *data); 1616 extern int register_event_command(struct event_command *cmd); 1617 extern int unregister_event_command(struct event_command *cmd); 1618 extern int register_trigger_hist_enable_disable_cmds(void); 1619 extern bool event_trigger_check_remove(const char *glob); 1620 extern bool event_trigger_empty_param(const char *param); 1621 extern int event_trigger_separate_filter(char *param_and_filter, char **param, 1622 char **filter, bool param_required); 1623 extern struct event_trigger_data * 1624 event_trigger_alloc(struct event_command *cmd_ops, 1625 char *cmd, 1626 char *param, 1627 void *private_data); 1628 extern int event_trigger_parse_num(char *trigger, 1629 struct event_trigger_data *trigger_data); 1630 extern int event_trigger_set_filter(struct event_command *cmd_ops, 1631 struct trace_event_file *file, 1632 char *param, 1633 struct event_trigger_data *trigger_data); 1634 extern void event_trigger_reset_filter(struct event_command *cmd_ops, 1635 struct event_trigger_data *trigger_data); 1636 extern int event_trigger_register(struct event_command *cmd_ops, 1637 struct trace_event_file *file, 1638 char *glob, 1639 struct event_trigger_data *trigger_data); 1640 extern void event_trigger_unregister(struct event_command *cmd_ops, 1641 struct trace_event_file *file, 1642 char *glob, 1643 struct event_trigger_data *trigger_data); 1644 1645 /** 1646 * struct event_trigger_ops - callbacks for trace event triggers 1647 * 1648 * The methods in this structure provide per-event trigger hooks for 1649 * various trigger operations. 1650 * 1651 * The @init and @free methods are used during trigger setup and 1652 * teardown, typically called from an event_command's @parse() 1653 * function implementation. 1654 * 1655 * The @print method is used to print the trigger spec. 1656 * 1657 * The @trigger method is the function that actually implements the 1658 * trigger and is called in the context of the triggering event 1659 * whenever that event occurs. 1660 * 1661 * All the methods below, except for @init() and @free(), must be 1662 * implemented. 1663 * 1664 * @trigger: The trigger 'probe' function called when the triggering 1665 * event occurs. The data passed into this callback is the data 1666 * that was supplied to the event_command @reg() function that 1667 * registered the trigger (see struct event_command) along with 1668 * the trace record, rec. 1669 * 1670 * @init: An optional initialization function called for the trigger 1671 * when the trigger is registered (via the event_command reg() 1672 * function). This can be used to perform per-trigger 1673 * initialization such as incrementing a per-trigger reference 1674 * count, for instance. This is usually implemented by the 1675 * generic utility function @event_trigger_init() (see 1676 * trace_event_triggers.c). 1677 * 1678 * @free: An optional de-initialization function called for the 1679 * trigger when the trigger is unregistered (via the 1680 * event_command @reg() function). This can be used to perform 1681 * per-trigger de-initialization such as decrementing a 1682 * per-trigger reference count and freeing corresponding trigger 1683 * data, for instance. This is usually implemented by the 1684 * generic utility function @event_trigger_free() (see 1685 * trace_event_triggers.c). 1686 * 1687 * @print: The callback function invoked to have the trigger print 1688 * itself. This is usually implemented by a wrapper function 1689 * that calls the generic utility function @event_trigger_print() 1690 * (see trace_event_triggers.c). 1691 */ 1692 struct event_trigger_ops { 1693 void (*trigger)(struct event_trigger_data *data, 1694 struct trace_buffer *buffer, 1695 void *rec, 1696 struct ring_buffer_event *rbe); 1697 int (*init)(struct event_trigger_data *data); 1698 void (*free)(struct event_trigger_data *data); 1699 int (*print)(struct seq_file *m, 1700 struct event_trigger_data *data); 1701 }; 1702 1703 /** 1704 * struct event_command - callbacks and data members for event commands 1705 * 1706 * Event commands are invoked by users by writing the command name 1707 * into the 'trigger' file associated with a trace event. The 1708 * parameters associated with a specific invocation of an event 1709 * command are used to create an event trigger instance, which is 1710 * added to the list of trigger instances associated with that trace 1711 * event. When the event is hit, the set of triggers associated with 1712 * that event is invoked. 1713 * 1714 * The data members in this structure provide per-event command data 1715 * for various event commands. 1716 * 1717 * All the data members below, except for @post_trigger, must be set 1718 * for each event command. 1719 * 1720 * @name: The unique name that identifies the event command. This is 1721 * the name used when setting triggers via trigger files. 1722 * 1723 * @trigger_type: A unique id that identifies the event command 1724 * 'type'. This value has two purposes, the first to ensure that 1725 * only one trigger of the same type can be set at a given time 1726 * for a particular event e.g. it doesn't make sense to have both 1727 * a traceon and traceoff trigger attached to a single event at 1728 * the same time, so traceon and traceoff have the same type 1729 * though they have different names. The @trigger_type value is 1730 * also used as a bit value for deferring the actual trigger 1731 * action until after the current event is finished. Some 1732 * commands need to do this if they themselves log to the trace 1733 * buffer (see the @post_trigger() member below). @trigger_type 1734 * values are defined by adding new values to the trigger_type 1735 * enum in include/linux/trace_events.h. 1736 * 1737 * @flags: See the enum event_command_flags below. 1738 * 1739 * All the methods below, except for @set_filter() and @unreg_all(), 1740 * must be implemented. 1741 * 1742 * @parse: The callback function responsible for parsing and 1743 * registering the trigger written to the 'trigger' file by the 1744 * user. It allocates the trigger instance and registers it with 1745 * the appropriate trace event. It makes use of the other 1746 * event_command callback functions to orchestrate this, and is 1747 * usually implemented by the generic utility function 1748 * @event_trigger_callback() (see trace_event_triggers.c). 1749 * 1750 * @reg: Adds the trigger to the list of triggers associated with the 1751 * event, and enables the event trigger itself, after 1752 * initializing it (via the event_trigger_ops @init() function). 1753 * This is also where commands can use the @trigger_type value to 1754 * make the decision as to whether or not multiple instances of 1755 * the trigger should be allowed. This is usually implemented by 1756 * the generic utility function @register_trigger() (see 1757 * trace_event_triggers.c). 1758 * 1759 * @unreg: Removes the trigger from the list of triggers associated 1760 * with the event, and disables the event trigger itself, after 1761 * initializing it (via the event_trigger_ops @free() function). 1762 * This is usually implemented by the generic utility function 1763 * @unregister_trigger() (see trace_event_triggers.c). 1764 * 1765 * @unreg_all: An optional function called to remove all the triggers 1766 * from the list of triggers associated with the event. Called 1767 * when a trigger file is opened in truncate mode. 1768 * 1769 * @set_filter: An optional function called to parse and set a filter 1770 * for the trigger. If no @set_filter() method is set for the 1771 * event command, filters set by the user for the command will be 1772 * ignored. This is usually implemented by the generic utility 1773 * function @set_trigger_filter() (see trace_event_triggers.c). 1774 * 1775 * @get_trigger_ops: The callback function invoked to retrieve the 1776 * event_trigger_ops implementation associated with the command. 1777 * This callback function allows a single event_command to 1778 * support multiple trigger implementations via different sets of 1779 * event_trigger_ops, depending on the value of the @param 1780 * string. 1781 */ 1782 struct event_command { 1783 struct list_head list; 1784 char *name; 1785 enum event_trigger_type trigger_type; 1786 int flags; 1787 int (*parse)(struct event_command *cmd_ops, 1788 struct trace_event_file *file, 1789 char *glob, char *cmd, 1790 char *param_and_filter); 1791 int (*reg)(char *glob, 1792 struct event_trigger_data *data, 1793 struct trace_event_file *file); 1794 void (*unreg)(char *glob, 1795 struct event_trigger_data *data, 1796 struct trace_event_file *file); 1797 void (*unreg_all)(struct trace_event_file *file); 1798 int (*set_filter)(char *filter_str, 1799 struct event_trigger_data *data, 1800 struct trace_event_file *file); 1801 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1802 }; 1803 1804 /** 1805 * enum event_command_flags - flags for struct event_command 1806 * 1807 * @POST_TRIGGER: A flag that says whether or not this command needs 1808 * to have its action delayed until after the current event has 1809 * been closed. Some triggers need to avoid being invoked while 1810 * an event is currently in the process of being logged, since 1811 * the trigger may itself log data into the trace buffer. Thus 1812 * we make sure the current event is committed before invoking 1813 * those triggers. To do that, the trigger invocation is split 1814 * in two - the first part checks the filter using the current 1815 * trace record; if a command has the @post_trigger flag set, it 1816 * sets a bit for itself in the return value, otherwise it 1817 * directly invokes the trigger. Once all commands have been 1818 * either invoked or set their return flag, the current record is 1819 * either committed or discarded. At that point, if any commands 1820 * have deferred their triggers, those commands are finally 1821 * invoked following the close of the current event. In other 1822 * words, if the event_trigger_ops @func() probe implementation 1823 * itself logs to the trace buffer, this flag should be set, 1824 * otherwise it can be left unspecified. 1825 * 1826 * @NEEDS_REC: A flag that says whether or not this command needs 1827 * access to the trace record in order to perform its function, 1828 * regardless of whether or not it has a filter associated with 1829 * it (filters make a trigger require access to the trace record 1830 * but are not always present). 1831 */ 1832 enum event_command_flags { 1833 EVENT_CMD_FL_POST_TRIGGER = 1, 1834 EVENT_CMD_FL_NEEDS_REC = 2, 1835 }; 1836 1837 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1838 { 1839 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1840 } 1841 1842 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1843 { 1844 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1845 } 1846 1847 extern int trace_event_enable_disable(struct trace_event_file *file, 1848 int enable, int soft_disable); 1849 extern int tracing_alloc_snapshot(void); 1850 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1851 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1852 1853 extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1854 extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1855 1856 extern const char *__start___trace_bprintk_fmt[]; 1857 extern const char *__stop___trace_bprintk_fmt[]; 1858 1859 extern const char *__start___tracepoint_str[]; 1860 extern const char *__stop___tracepoint_str[]; 1861 1862 void trace_printk_control(bool enabled); 1863 void trace_printk_start_comm(void); 1864 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1865 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1866 1867 /* Used from boot time tracer */ 1868 extern int trace_set_options(struct trace_array *tr, char *option); 1869 extern int tracing_set_tracer(struct trace_array *tr, const char *buf); 1870 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr, 1871 unsigned long size, int cpu_id); 1872 extern int tracing_set_cpumask(struct trace_array *tr, 1873 cpumask_var_t tracing_cpumask_new); 1874 1875 1876 #define MAX_EVENT_NAME_LEN 64 1877 1878 extern ssize_t trace_parse_run_command(struct file *file, 1879 const char __user *buffer, size_t count, loff_t *ppos, 1880 int (*createfn)(const char *)); 1881 1882 extern unsigned int err_pos(char *cmd, const char *str); 1883 extern void tracing_log_err(struct trace_array *tr, 1884 const char *loc, const char *cmd, 1885 const char **errs, u8 type, u16 pos); 1886 1887 /* 1888 * Normal trace_printk() and friends allocates special buffers 1889 * to do the manipulation, as well as saves the print formats 1890 * into sections to display. But the trace infrastructure wants 1891 * to use these without the added overhead at the price of being 1892 * a bit slower (used mainly for warnings, where we don't care 1893 * about performance). The internal_trace_puts() is for such 1894 * a purpose. 1895 */ 1896 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1897 1898 #undef FTRACE_ENTRY 1899 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 1900 extern struct trace_event_call \ 1901 __aligned(4) event_##call; 1902 #undef FTRACE_ENTRY_DUP 1903 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 1904 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1905 #undef FTRACE_ENTRY_PACKED 1906 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \ 1907 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 1908 1909 #include "trace_entries.h" 1910 1911 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1912 int perf_ftrace_event_register(struct trace_event_call *call, 1913 enum trace_reg type, void *data); 1914 #else 1915 #define perf_ftrace_event_register NULL 1916 #endif 1917 1918 #ifdef CONFIG_FTRACE_SYSCALLS 1919 void init_ftrace_syscalls(void); 1920 const char *get_syscall_name(int syscall); 1921 #else 1922 static inline void init_ftrace_syscalls(void) { } 1923 static inline const char *get_syscall_name(int syscall) 1924 { 1925 return NULL; 1926 } 1927 #endif 1928 1929 #ifdef CONFIG_EVENT_TRACING 1930 void trace_event_init(void); 1931 void trace_event_eval_update(struct trace_eval_map **map, int len); 1932 /* Used from boot time tracer */ 1933 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); 1934 extern int trigger_process_regex(struct trace_event_file *file, char *buff); 1935 #else 1936 static inline void __init trace_event_init(void) { } 1937 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1938 #endif 1939 1940 #ifdef CONFIG_TRACER_SNAPSHOT 1941 void tracing_snapshot_instance(struct trace_array *tr); 1942 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1943 #else 1944 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1945 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1946 { 1947 return 0; 1948 } 1949 #endif 1950 1951 #ifdef CONFIG_PREEMPT_TRACER 1952 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1953 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1954 #else 1955 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1956 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1957 #endif 1958 #ifdef CONFIG_IRQSOFF_TRACER 1959 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1960 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1961 #else 1962 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1963 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1964 #endif 1965 1966 /* 1967 * Reset the state of the trace_iterator so that it can read consumed data. 1968 * Normally, the trace_iterator is used for reading the data when it is not 1969 * consumed, and must retain state. 1970 */ 1971 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 1972 { 1973 memset_startat(iter, 0, seq); 1974 iter->pos = -1; 1975 } 1976 1977 /* Check the name is good for event/group/fields */ 1978 static inline bool __is_good_name(const char *name, bool hash_ok) 1979 { 1980 if (!isalpha(*name) && *name != '_' && (!hash_ok || *name != '-')) 1981 return false; 1982 while (*++name != '\0') { 1983 if (!isalpha(*name) && !isdigit(*name) && *name != '_' && 1984 (!hash_ok || *name != '-')) 1985 return false; 1986 } 1987 return true; 1988 } 1989 1990 /* Check the name is good for event/group/fields */ 1991 static inline bool is_good_name(const char *name) 1992 { 1993 return __is_good_name(name, false); 1994 } 1995 1996 /* Check the name is good for system */ 1997 static inline bool is_good_system_name(const char *name) 1998 { 1999 return __is_good_name(name, true); 2000 } 2001 2002 /* Convert certain expected symbols into '_' when generating event names */ 2003 static inline void sanitize_event_name(char *name) 2004 { 2005 while (*name++ != '\0') 2006 if (*name == ':' || *name == '.') 2007 *name = '_'; 2008 } 2009 2010 /* 2011 * This is a generic way to read and write a u64 value from a file in tracefs. 2012 * 2013 * The value is stored on the variable pointed by *val. The value needs 2014 * to be at least *min and at most *max. The write is protected by an 2015 * existing *lock. 2016 */ 2017 struct trace_min_max_param { 2018 struct mutex *lock; 2019 u64 *val; 2020 u64 *min; 2021 u64 *max; 2022 }; 2023 2024 #define U64_STR_SIZE 24 /* 20 digits max */ 2025 2026 extern const struct file_operations trace_min_max_fops; 2027 2028 #ifdef CONFIG_RV 2029 extern int rv_init_interface(void); 2030 #else 2031 static inline int rv_init_interface(void) 2032 { 2033 return 0; 2034 } 2035 #endif 2036 2037 #endif /* _LINUX_KERNEL_TRACE_H */ 2038