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