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