1 2 #ifndef _LINUX_KERNEL_TRACE_H 3 #define _LINUX_KERNEL_TRACE_H 4 5 #include <linux/fs.h> 6 #include <linux/atomic.h> 7 #include <linux/sched.h> 8 #include <linux/clocksource.h> 9 #include <linux/ring_buffer.h> 10 #include <linux/mmiotrace.h> 11 #include <linux/tracepoint.h> 12 #include <linux/ftrace.h> 13 #include <linux/hw_breakpoint.h> 14 #include <linux/trace_seq.h> 15 #include <linux/trace_events.h> 16 #include <linux/compiler.h> 17 #include <linux/trace_seq.h> 18 19 #ifdef CONFIG_FTRACE_SYSCALLS 20 #include <asm/unistd.h> /* For NR_SYSCALLS */ 21 #include <asm/syscall.h> /* some archs define it here */ 22 #endif 23 24 enum trace_type { 25 __TRACE_FIRST_TYPE = 0, 26 27 TRACE_FN, 28 TRACE_CTX, 29 TRACE_WAKE, 30 TRACE_STACK, 31 TRACE_PRINT, 32 TRACE_BPRINT, 33 TRACE_MMIO_RW, 34 TRACE_MMIO_MAP, 35 TRACE_BRANCH, 36 TRACE_GRAPH_RET, 37 TRACE_GRAPH_ENT, 38 TRACE_USER_STACK, 39 TRACE_BLK, 40 TRACE_BPUTS, 41 42 __TRACE_LAST_TYPE, 43 }; 44 45 46 #undef __field 47 #define __field(type, item) type item; 48 49 #undef __field_struct 50 #define __field_struct(type, item) __field(type, item) 51 52 #undef __field_desc 53 #define __field_desc(type, container, item) 54 55 #undef __array 56 #define __array(type, item, size) type item[size]; 57 58 #undef __array_desc 59 #define __array_desc(type, container, item, size) 60 61 #undef __dynamic_array 62 #define __dynamic_array(type, item) type item[]; 63 64 #undef F_STRUCT 65 #define F_STRUCT(args...) args 66 67 #undef FTRACE_ENTRY 68 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 69 struct struct_name { \ 70 struct trace_entry ent; \ 71 tstruct \ 72 } 73 74 #undef FTRACE_ENTRY_DUP 75 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) 76 77 #undef FTRACE_ENTRY_REG 78 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 79 filter, regfn) \ 80 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 81 filter) 82 83 #include "trace_entries.h" 84 85 /* 86 * syscalls are special, and need special handling, this is why 87 * they are not included in trace_entries.h 88 */ 89 struct syscall_trace_enter { 90 struct trace_entry ent; 91 int nr; 92 unsigned long args[]; 93 }; 94 95 struct syscall_trace_exit { 96 struct trace_entry ent; 97 int nr; 98 long ret; 99 }; 100 101 struct kprobe_trace_entry_head { 102 struct trace_entry ent; 103 unsigned long ip; 104 }; 105 106 struct kretprobe_trace_entry_head { 107 struct trace_entry ent; 108 unsigned long func; 109 unsigned long ret_ip; 110 }; 111 112 /* 113 * trace_flag_type is an enumeration that holds different 114 * states when a trace occurs. These are: 115 * IRQS_OFF - interrupts were disabled 116 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 117 * NEED_RESCHED - reschedule is requested 118 * HARDIRQ - inside an interrupt handler 119 * SOFTIRQ - inside a softirq handler 120 */ 121 enum trace_flag_type { 122 TRACE_FLAG_IRQS_OFF = 0x01, 123 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 124 TRACE_FLAG_NEED_RESCHED = 0x04, 125 TRACE_FLAG_HARDIRQ = 0x08, 126 TRACE_FLAG_SOFTIRQ = 0x10, 127 TRACE_FLAG_PREEMPT_RESCHED = 0x20, 128 }; 129 130 #define TRACE_BUF_SIZE 1024 131 132 struct trace_array; 133 134 /* 135 * The CPU trace array - it consists of thousands of trace entries 136 * plus some other descriptor data: (for example which task started 137 * the trace, etc.) 138 */ 139 struct trace_array_cpu { 140 atomic_t disabled; 141 void *buffer_page; /* ring buffer spare */ 142 143 unsigned long entries; 144 unsigned long saved_latency; 145 unsigned long critical_start; 146 unsigned long critical_end; 147 unsigned long critical_sequence; 148 unsigned long nice; 149 unsigned long policy; 150 unsigned long rt_priority; 151 unsigned long skipped_entries; 152 cycle_t preempt_timestamp; 153 pid_t pid; 154 kuid_t uid; 155 char comm[TASK_COMM_LEN]; 156 157 bool ignore_pid; 158 }; 159 160 struct tracer; 161 struct trace_option_dentry; 162 163 struct trace_buffer { 164 struct trace_array *tr; 165 struct ring_buffer *buffer; 166 struct trace_array_cpu __percpu *data; 167 cycle_t time_start; 168 int cpu; 169 }; 170 171 #define TRACE_FLAGS_MAX_SIZE 32 172 173 struct trace_options { 174 struct tracer *tracer; 175 struct trace_option_dentry *topts; 176 }; 177 178 struct trace_pid_list { 179 unsigned int nr_pids; 180 int order; 181 pid_t *pids; 182 }; 183 184 /* 185 * The trace array - an array of per-CPU trace arrays. This is the 186 * highest level data structure that individual tracers deal with. 187 * They have on/off state as well: 188 */ 189 struct trace_array { 190 struct list_head list; 191 char *name; 192 struct trace_buffer trace_buffer; 193 #ifdef CONFIG_TRACER_MAX_TRACE 194 /* 195 * The max_buffer is used to snapshot the trace when a maximum 196 * latency is reached, or when the user initiates a snapshot. 197 * Some tracers will use this to store a maximum trace while 198 * it continues examining live traces. 199 * 200 * The buffers for the max_buffer are set up the same as the trace_buffer 201 * When a snapshot is taken, the buffer of the max_buffer is swapped 202 * with the buffer of the trace_buffer and the buffers are reset for 203 * the trace_buffer so the tracing can continue. 204 */ 205 struct trace_buffer max_buffer; 206 bool allocated_snapshot; 207 unsigned long max_latency; 208 #endif 209 struct trace_pid_list __rcu *filtered_pids; 210 /* 211 * max_lock is used to protect the swapping of buffers 212 * when taking a max snapshot. The buffers themselves are 213 * protected by per_cpu spinlocks. But the action of the swap 214 * needs its own lock. 215 * 216 * This is defined as a arch_spinlock_t in order to help 217 * with performance when lockdep debugging is enabled. 218 * 219 * It is also used in other places outside the update_max_tr 220 * so it needs to be defined outside of the 221 * CONFIG_TRACER_MAX_TRACE. 222 */ 223 arch_spinlock_t max_lock; 224 int buffer_disabled; 225 #ifdef CONFIG_FTRACE_SYSCALLS 226 int sys_refcount_enter; 227 int sys_refcount_exit; 228 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 229 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 230 #endif 231 int stop_count; 232 int clock_id; 233 int nr_topts; 234 struct tracer *current_trace; 235 unsigned int trace_flags; 236 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 237 unsigned int flags; 238 raw_spinlock_t start_lock; 239 struct dentry *dir; 240 struct dentry *options; 241 struct dentry *percpu_dir; 242 struct dentry *event_dir; 243 struct trace_options *topts; 244 struct list_head systems; 245 struct list_head events; 246 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 247 int ref; 248 #ifdef CONFIG_FUNCTION_TRACER 249 struct ftrace_ops *ops; 250 /* function tracing enabled */ 251 int function_enabled; 252 #endif 253 }; 254 255 enum { 256 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 257 }; 258 259 extern struct list_head ftrace_trace_arrays; 260 261 extern struct mutex trace_types_lock; 262 263 extern int trace_array_get(struct trace_array *tr); 264 extern void trace_array_put(struct trace_array *tr); 265 266 /* 267 * The global tracer (top) should be the first trace array added, 268 * but we check the flag anyway. 269 */ 270 static inline struct trace_array *top_trace_array(void) 271 { 272 struct trace_array *tr; 273 274 if (list_empty(&ftrace_trace_arrays)) 275 return NULL; 276 277 tr = list_entry(ftrace_trace_arrays.prev, 278 typeof(*tr), list); 279 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 280 return tr; 281 } 282 283 #define FTRACE_CMP_TYPE(var, type) \ 284 __builtin_types_compatible_p(typeof(var), type *) 285 286 #undef IF_ASSIGN 287 #define IF_ASSIGN(var, entry, etype, id) \ 288 if (FTRACE_CMP_TYPE(var, etype)) { \ 289 var = (typeof(var))(entry); \ 290 WARN_ON(id && (entry)->type != id); \ 291 break; \ 292 } 293 294 /* Will cause compile errors if type is not found. */ 295 extern void __ftrace_bad_type(void); 296 297 /* 298 * The trace_assign_type is a verifier that the entry type is 299 * the same as the type being assigned. To add new types simply 300 * add a line with the following format: 301 * 302 * IF_ASSIGN(var, ent, type, id); 303 * 304 * Where "type" is the trace type that includes the trace_entry 305 * as the "ent" item. And "id" is the trace identifier that is 306 * used in the trace_type enum. 307 * 308 * If the type can have more than one id, then use zero. 309 */ 310 #define trace_assign_type(var, ent) \ 311 do { \ 312 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 313 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 314 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 315 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 316 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 317 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 318 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 319 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 320 TRACE_MMIO_RW); \ 321 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 322 TRACE_MMIO_MAP); \ 323 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 324 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 325 TRACE_GRAPH_ENT); \ 326 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 327 TRACE_GRAPH_RET); \ 328 __ftrace_bad_type(); \ 329 } while (0) 330 331 /* 332 * An option specific to a tracer. This is a boolean value. 333 * The bit is the bit index that sets its value on the 334 * flags value in struct tracer_flags. 335 */ 336 struct tracer_opt { 337 const char *name; /* Will appear on the trace_options file */ 338 u32 bit; /* Mask assigned in val field in tracer_flags */ 339 }; 340 341 /* 342 * The set of specific options for a tracer. Your tracer 343 * have to set the initial value of the flags val. 344 */ 345 struct tracer_flags { 346 u32 val; 347 struct tracer_opt *opts; 348 }; 349 350 /* Makes more easy to define a tracer opt */ 351 #define TRACER_OPT(s, b) .name = #s, .bit = b 352 353 354 struct trace_option_dentry { 355 struct tracer_opt *opt; 356 struct tracer_flags *flags; 357 struct trace_array *tr; 358 struct dentry *entry; 359 }; 360 361 /** 362 * struct tracer - a specific tracer and its callbacks to interact with tracefs 363 * @name: the name chosen to select it on the available_tracers file 364 * @init: called when one switches to this tracer (echo name > current_tracer) 365 * @reset: called when one switches to another tracer 366 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 367 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 368 * @update_thresh: called when tracing_thresh is updated 369 * @open: called when the trace file is opened 370 * @pipe_open: called when the trace_pipe file is opened 371 * @close: called when the trace file is released 372 * @pipe_close: called when the trace_pipe file is released 373 * @read: override the default read callback on trace_pipe 374 * @splice_read: override the default splice_read callback on trace_pipe 375 * @selftest: selftest to run on boot (see trace_selftest.c) 376 * @print_headers: override the first lines that describe your columns 377 * @print_line: callback that prints a trace 378 * @set_flag: signals one of your private flags changed (trace_options file) 379 * @flags: your private flags 380 */ 381 struct tracer { 382 const char *name; 383 int (*init)(struct trace_array *tr); 384 void (*reset)(struct trace_array *tr); 385 void (*start)(struct trace_array *tr); 386 void (*stop)(struct trace_array *tr); 387 int (*update_thresh)(struct trace_array *tr); 388 void (*open)(struct trace_iterator *iter); 389 void (*pipe_open)(struct trace_iterator *iter); 390 void (*close)(struct trace_iterator *iter); 391 void (*pipe_close)(struct trace_iterator *iter); 392 ssize_t (*read)(struct trace_iterator *iter, 393 struct file *filp, char __user *ubuf, 394 size_t cnt, loff_t *ppos); 395 ssize_t (*splice_read)(struct trace_iterator *iter, 396 struct file *filp, 397 loff_t *ppos, 398 struct pipe_inode_info *pipe, 399 size_t len, 400 unsigned int flags); 401 #ifdef CONFIG_FTRACE_STARTUP_TEST 402 int (*selftest)(struct tracer *trace, 403 struct trace_array *tr); 404 #endif 405 void (*print_header)(struct seq_file *m); 406 enum print_line_t (*print_line)(struct trace_iterator *iter); 407 /* If you handled the flag setting, return 0 */ 408 int (*set_flag)(struct trace_array *tr, 409 u32 old_flags, u32 bit, int set); 410 /* Return 0 if OK with change, else return non-zero */ 411 int (*flag_changed)(struct trace_array *tr, 412 u32 mask, int set); 413 struct tracer *next; 414 struct tracer_flags *flags; 415 int enabled; 416 int ref; 417 bool print_max; 418 bool allow_instances; 419 #ifdef CONFIG_TRACER_MAX_TRACE 420 bool use_max_tr; 421 #endif 422 }; 423 424 425 /* Only current can touch trace_recursion */ 426 427 /* 428 * For function tracing recursion: 429 * The order of these bits are important. 430 * 431 * When function tracing occurs, the following steps are made: 432 * If arch does not support a ftrace feature: 433 * call internal function (uses INTERNAL bits) which calls... 434 * If callback is registered to the "global" list, the list 435 * function is called and recursion checks the GLOBAL bits. 436 * then this function calls... 437 * The function callback, which can use the FTRACE bits to 438 * check for recursion. 439 * 440 * Now if the arch does not suppport a feature, and it calls 441 * the global list function which calls the ftrace callback 442 * all three of these steps will do a recursion protection. 443 * There's no reason to do one if the previous caller already 444 * did. The recursion that we are protecting against will 445 * go through the same steps again. 446 * 447 * To prevent the multiple recursion checks, if a recursion 448 * bit is set that is higher than the MAX bit of the current 449 * check, then we know that the check was made by the previous 450 * caller, and we can skip the current check. 451 */ 452 enum { 453 TRACE_BUFFER_BIT, 454 TRACE_BUFFER_NMI_BIT, 455 TRACE_BUFFER_IRQ_BIT, 456 TRACE_BUFFER_SIRQ_BIT, 457 458 /* Start of function recursion bits */ 459 TRACE_FTRACE_BIT, 460 TRACE_FTRACE_NMI_BIT, 461 TRACE_FTRACE_IRQ_BIT, 462 TRACE_FTRACE_SIRQ_BIT, 463 464 /* INTERNAL_BITs must be greater than FTRACE_BITs */ 465 TRACE_INTERNAL_BIT, 466 TRACE_INTERNAL_NMI_BIT, 467 TRACE_INTERNAL_IRQ_BIT, 468 TRACE_INTERNAL_SIRQ_BIT, 469 470 TRACE_CONTROL_BIT, 471 472 TRACE_BRANCH_BIT, 473 /* 474 * Abuse of the trace_recursion. 475 * As we need a way to maintain state if we are tracing the function 476 * graph in irq because we want to trace a particular function that 477 * was called in irq context but we have irq tracing off. Since this 478 * can only be modified by current, we can reuse trace_recursion. 479 */ 480 TRACE_IRQ_BIT, 481 }; 482 483 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 484 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 485 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 486 487 #define TRACE_CONTEXT_BITS 4 488 489 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 490 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 491 492 #define TRACE_LIST_START TRACE_INTERNAL_BIT 493 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 494 495 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 496 497 static __always_inline int trace_get_context_bit(void) 498 { 499 int bit; 500 501 if (in_interrupt()) { 502 if (in_nmi()) 503 bit = 0; 504 505 else if (in_irq()) 506 bit = 1; 507 else 508 bit = 2; 509 } else 510 bit = 3; 511 512 return bit; 513 } 514 515 static __always_inline int trace_test_and_set_recursion(int start, int max) 516 { 517 unsigned int val = current->trace_recursion; 518 int bit; 519 520 /* A previous recursion check was made */ 521 if ((val & TRACE_CONTEXT_MASK) > max) 522 return 0; 523 524 bit = trace_get_context_bit() + start; 525 if (unlikely(val & (1 << bit))) 526 return -1; 527 528 val |= 1 << bit; 529 current->trace_recursion = val; 530 barrier(); 531 532 return bit; 533 } 534 535 static __always_inline void trace_clear_recursion(int bit) 536 { 537 unsigned int val = current->trace_recursion; 538 539 if (!bit) 540 return; 541 542 bit = 1 << bit; 543 val &= ~bit; 544 545 barrier(); 546 current->trace_recursion = val; 547 } 548 549 static inline struct ring_buffer_iter * 550 trace_buffer_iter(struct trace_iterator *iter, int cpu) 551 { 552 if (iter->buffer_iter && iter->buffer_iter[cpu]) 553 return iter->buffer_iter[cpu]; 554 return NULL; 555 } 556 557 int tracer_init(struct tracer *t, struct trace_array *tr); 558 int tracing_is_enabled(void); 559 void tracing_reset(struct trace_buffer *buf, int cpu); 560 void tracing_reset_online_cpus(struct trace_buffer *buf); 561 void tracing_reset_current(int cpu); 562 void tracing_reset_all_online_cpus(void); 563 int tracing_open_generic(struct inode *inode, struct file *filp); 564 bool tracing_is_disabled(void); 565 struct dentry *trace_create_file(const char *name, 566 umode_t mode, 567 struct dentry *parent, 568 void *data, 569 const struct file_operations *fops); 570 571 struct dentry *tracing_init_dentry(void); 572 573 struct ring_buffer_event; 574 575 struct ring_buffer_event * 576 trace_buffer_lock_reserve(struct ring_buffer *buffer, 577 int type, 578 unsigned long len, 579 unsigned long flags, 580 int pc); 581 582 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 583 struct trace_array_cpu *data); 584 585 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 586 int *ent_cpu, u64 *ent_ts); 587 588 void __buffer_unlock_commit(struct ring_buffer *buffer, 589 struct ring_buffer_event *event); 590 591 int trace_empty(struct trace_iterator *iter); 592 593 void *trace_find_next_entry_inc(struct trace_iterator *iter); 594 595 void trace_init_global_iter(struct trace_iterator *iter); 596 597 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 598 599 void trace_function(struct trace_array *tr, 600 unsigned long ip, 601 unsigned long parent_ip, 602 unsigned long flags, int pc); 603 void trace_graph_function(struct trace_array *tr, 604 unsigned long ip, 605 unsigned long parent_ip, 606 unsigned long flags, int pc); 607 void trace_latency_header(struct seq_file *m); 608 void trace_default_header(struct seq_file *m); 609 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 610 int trace_empty(struct trace_iterator *iter); 611 612 void trace_graph_return(struct ftrace_graph_ret *trace); 613 int trace_graph_entry(struct ftrace_graph_ent *trace); 614 void set_graph_array(struct trace_array *tr); 615 616 void tracing_start_cmdline_record(void); 617 void tracing_stop_cmdline_record(void); 618 int register_tracer(struct tracer *type); 619 int is_tracing_stopped(void); 620 621 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 622 623 extern cpumask_var_t __read_mostly tracing_buffer_mask; 624 625 #define for_each_tracing_cpu(cpu) \ 626 for_each_cpu(cpu, tracing_buffer_mask) 627 628 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 629 630 extern unsigned long tracing_thresh; 631 632 #ifdef CONFIG_TRACER_MAX_TRACE 633 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 634 void update_max_tr_single(struct trace_array *tr, 635 struct task_struct *tsk, int cpu); 636 #endif /* CONFIG_TRACER_MAX_TRACE */ 637 638 #ifdef CONFIG_STACKTRACE 639 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 640 int pc); 641 642 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 643 int pc); 644 #else 645 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 646 unsigned long flags, int pc) 647 { 648 } 649 650 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 651 int skip, int pc) 652 { 653 } 654 #endif /* CONFIG_STACKTRACE */ 655 656 extern cycle_t ftrace_now(int cpu); 657 658 extern void trace_find_cmdline(int pid, char comm[]); 659 660 #ifdef CONFIG_DYNAMIC_FTRACE 661 extern unsigned long ftrace_update_tot_cnt; 662 #endif 663 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 664 extern int DYN_FTRACE_TEST_NAME(void); 665 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 666 extern int DYN_FTRACE_TEST_NAME2(void); 667 668 extern bool ring_buffer_expanded; 669 extern bool tracing_selftest_disabled; 670 671 #ifdef CONFIG_FTRACE_STARTUP_TEST 672 extern int trace_selftest_startup_function(struct tracer *trace, 673 struct trace_array *tr); 674 extern int trace_selftest_startup_function_graph(struct tracer *trace, 675 struct trace_array *tr); 676 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 677 struct trace_array *tr); 678 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 679 struct trace_array *tr); 680 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 681 struct trace_array *tr); 682 extern int trace_selftest_startup_wakeup(struct tracer *trace, 683 struct trace_array *tr); 684 extern int trace_selftest_startup_nop(struct tracer *trace, 685 struct trace_array *tr); 686 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 687 struct trace_array *tr); 688 extern int trace_selftest_startup_branch(struct tracer *trace, 689 struct trace_array *tr); 690 /* 691 * Tracer data references selftest functions that only occur 692 * on boot up. These can be __init functions. Thus, when selftests 693 * are enabled, then the tracers need to reference __init functions. 694 */ 695 #define __tracer_data __refdata 696 #else 697 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 698 #define __tracer_data __read_mostly 699 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 700 701 extern void *head_page(struct trace_array_cpu *data); 702 extern unsigned long long ns2usecs(cycle_t nsec); 703 extern int 704 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 705 extern int 706 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 707 extern int 708 trace_array_vprintk(struct trace_array *tr, 709 unsigned long ip, const char *fmt, va_list args); 710 int trace_array_printk(struct trace_array *tr, 711 unsigned long ip, const char *fmt, ...); 712 int trace_array_printk_buf(struct ring_buffer *buffer, 713 unsigned long ip, const char *fmt, ...); 714 void trace_printk_seq(struct trace_seq *s); 715 enum print_line_t print_trace_line(struct trace_iterator *iter); 716 717 extern char trace_find_mark(unsigned long long duration); 718 719 /* Standard output formatting function used for function return traces */ 720 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 721 722 /* Flag options */ 723 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 724 #define TRACE_GRAPH_PRINT_CPU 0x2 725 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 726 #define TRACE_GRAPH_PRINT_PROC 0x8 727 #define TRACE_GRAPH_PRINT_DURATION 0x10 728 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 729 #define TRACE_GRAPH_PRINT_IRQS 0x40 730 #define TRACE_GRAPH_PRINT_TAIL 0x80 731 #define TRACE_GRAPH_SLEEP_TIME 0x100 732 #define TRACE_GRAPH_GRAPH_TIME 0x200 733 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 734 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 735 736 extern void ftrace_graph_sleep_time_control(bool enable); 737 extern void ftrace_graph_graph_time_control(bool enable); 738 739 extern enum print_line_t 740 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 741 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 742 extern void 743 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 744 extern void graph_trace_open(struct trace_iterator *iter); 745 extern void graph_trace_close(struct trace_iterator *iter); 746 extern int __trace_graph_entry(struct trace_array *tr, 747 struct ftrace_graph_ent *trace, 748 unsigned long flags, int pc); 749 extern void __trace_graph_return(struct trace_array *tr, 750 struct ftrace_graph_ret *trace, 751 unsigned long flags, int pc); 752 753 754 #ifdef CONFIG_DYNAMIC_FTRACE 755 /* TODO: make this variable */ 756 #define FTRACE_GRAPH_MAX_FUNCS 32 757 extern int ftrace_graph_count; 758 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 759 extern int ftrace_graph_notrace_count; 760 extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; 761 762 static inline int ftrace_graph_addr(unsigned long addr) 763 { 764 int i; 765 766 if (!ftrace_graph_count) 767 return 1; 768 769 for (i = 0; i < ftrace_graph_count; i++) { 770 if (addr == ftrace_graph_funcs[i]) { 771 /* 772 * If no irqs are to be traced, but a set_graph_function 773 * is set, and called by an interrupt handler, we still 774 * want to trace it. 775 */ 776 if (in_irq()) 777 trace_recursion_set(TRACE_IRQ_BIT); 778 else 779 trace_recursion_clear(TRACE_IRQ_BIT); 780 return 1; 781 } 782 } 783 784 return 0; 785 } 786 787 static inline int ftrace_graph_notrace_addr(unsigned long addr) 788 { 789 int i; 790 791 if (!ftrace_graph_notrace_count) 792 return 0; 793 794 for (i = 0; i < ftrace_graph_notrace_count; i++) { 795 if (addr == ftrace_graph_notrace_funcs[i]) 796 return 1; 797 } 798 799 return 0; 800 } 801 #else 802 static inline int ftrace_graph_addr(unsigned long addr) 803 { 804 return 1; 805 } 806 807 static inline int ftrace_graph_notrace_addr(unsigned long addr) 808 { 809 return 0; 810 } 811 #endif /* CONFIG_DYNAMIC_FTRACE */ 812 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 813 static inline enum print_line_t 814 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 815 { 816 return TRACE_TYPE_UNHANDLED; 817 } 818 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 819 820 extern struct list_head ftrace_pids; 821 822 #ifdef CONFIG_FUNCTION_TRACER 823 extern bool ftrace_filter_param __initdata; 824 static inline int ftrace_trace_task(struct task_struct *task) 825 { 826 if (list_empty(&ftrace_pids)) 827 return 1; 828 829 return test_tsk_trace_trace(task); 830 } 831 extern int ftrace_is_dead(void); 832 int ftrace_create_function_files(struct trace_array *tr, 833 struct dentry *parent); 834 void ftrace_destroy_function_files(struct trace_array *tr); 835 void ftrace_init_global_array_ops(struct trace_array *tr); 836 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 837 void ftrace_reset_array_ops(struct trace_array *tr); 838 int using_ftrace_ops_list_func(void); 839 #else 840 static inline int ftrace_trace_task(struct task_struct *task) 841 { 842 return 1; 843 } 844 static inline int ftrace_is_dead(void) { return 0; } 845 static inline int 846 ftrace_create_function_files(struct trace_array *tr, 847 struct dentry *parent) 848 { 849 return 0; 850 } 851 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 852 static inline __init void 853 ftrace_init_global_array_ops(struct trace_array *tr) { } 854 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 855 /* ftace_func_t type is not defined, use macro instead of static inline */ 856 #define ftrace_init_array_ops(tr, func) do { } while (0) 857 #endif /* CONFIG_FUNCTION_TRACER */ 858 859 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 860 void ftrace_create_filter_files(struct ftrace_ops *ops, 861 struct dentry *parent); 862 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 863 #else 864 /* 865 * The ops parameter passed in is usually undefined. 866 * This must be a macro. 867 */ 868 #define ftrace_create_filter_files(ops, parent) do { } while (0) 869 #define ftrace_destroy_filter_files(ops) do { } while (0) 870 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 871 872 bool ftrace_event_is_function(struct trace_event_call *call); 873 874 /* 875 * struct trace_parser - servers for reading the user input separated by spaces 876 * @cont: set if the input is not complete - no final space char was found 877 * @buffer: holds the parsed user input 878 * @idx: user input length 879 * @size: buffer size 880 */ 881 struct trace_parser { 882 bool cont; 883 char *buffer; 884 unsigned idx; 885 unsigned size; 886 }; 887 888 static inline bool trace_parser_loaded(struct trace_parser *parser) 889 { 890 return (parser->idx != 0); 891 } 892 893 static inline bool trace_parser_cont(struct trace_parser *parser) 894 { 895 return parser->cont; 896 } 897 898 static inline void trace_parser_clear(struct trace_parser *parser) 899 { 900 parser->cont = false; 901 parser->idx = 0; 902 } 903 904 extern int trace_parser_get_init(struct trace_parser *parser, int size); 905 extern void trace_parser_put(struct trace_parser *parser); 906 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 907 size_t cnt, loff_t *ppos); 908 909 /* 910 * Only create function graph options if function graph is configured. 911 */ 912 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 913 # define FGRAPH_FLAGS \ 914 C(DISPLAY_GRAPH, "display-graph"), 915 #else 916 # define FGRAPH_FLAGS 917 #endif 918 919 #ifdef CONFIG_BRANCH_TRACER 920 # define BRANCH_FLAGS \ 921 C(BRANCH, "branch"), 922 #else 923 # define BRANCH_FLAGS 924 #endif 925 926 #ifdef CONFIG_FUNCTION_TRACER 927 # define FUNCTION_FLAGS \ 928 C(FUNCTION, "function-trace"), 929 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 930 #else 931 # define FUNCTION_FLAGS 932 # define FUNCTION_DEFAULT_FLAGS 0UL 933 #endif 934 935 #ifdef CONFIG_STACKTRACE 936 # define STACK_FLAGS \ 937 C(STACKTRACE, "stacktrace"), 938 #else 939 # define STACK_FLAGS 940 #endif 941 942 /* 943 * trace_iterator_flags is an enumeration that defines bit 944 * positions into trace_flags that controls the output. 945 * 946 * NOTE: These bits must match the trace_options array in 947 * trace.c (this macro guarantees it). 948 */ 949 #define TRACE_FLAGS \ 950 C(PRINT_PARENT, "print-parent"), \ 951 C(SYM_OFFSET, "sym-offset"), \ 952 C(SYM_ADDR, "sym-addr"), \ 953 C(VERBOSE, "verbose"), \ 954 C(RAW, "raw"), \ 955 C(HEX, "hex"), \ 956 C(BIN, "bin"), \ 957 C(BLOCK, "block"), \ 958 C(PRINTK, "trace_printk"), \ 959 C(ANNOTATE, "annotate"), \ 960 C(USERSTACKTRACE, "userstacktrace"), \ 961 C(SYM_USEROBJ, "sym-userobj"), \ 962 C(PRINTK_MSGONLY, "printk-msg-only"), \ 963 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 964 C(LATENCY_FMT, "latency-format"), \ 965 C(RECORD_CMD, "record-cmd"), \ 966 C(OVERWRITE, "overwrite"), \ 967 C(STOP_ON_FREE, "disable_on_free"), \ 968 C(IRQ_INFO, "irq-info"), \ 969 C(MARKERS, "markers"), \ 970 FUNCTION_FLAGS \ 971 FGRAPH_FLAGS \ 972 STACK_FLAGS \ 973 BRANCH_FLAGS 974 975 /* 976 * By defining C, we can make TRACE_FLAGS a list of bit names 977 * that will define the bits for the flag masks. 978 */ 979 #undef C 980 #define C(a, b) TRACE_ITER_##a##_BIT 981 982 enum trace_iterator_bits { 983 TRACE_FLAGS 984 /* Make sure we don't go more than we have bits for */ 985 TRACE_ITER_LAST_BIT 986 }; 987 988 /* 989 * By redefining C, we can make TRACE_FLAGS a list of masks that 990 * use the bits as defined above. 991 */ 992 #undef C 993 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 994 995 enum trace_iterator_flags { TRACE_FLAGS }; 996 997 /* 998 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 999 * control the output of kernel symbols. 1000 */ 1001 #define TRACE_ITER_SYM_MASK \ 1002 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1003 1004 extern struct tracer nop_trace; 1005 1006 #ifdef CONFIG_BRANCH_TRACER 1007 extern int enable_branch_tracing(struct trace_array *tr); 1008 extern void disable_branch_tracing(void); 1009 static inline int trace_branch_enable(struct trace_array *tr) 1010 { 1011 if (tr->trace_flags & TRACE_ITER_BRANCH) 1012 return enable_branch_tracing(tr); 1013 return 0; 1014 } 1015 static inline void trace_branch_disable(void) 1016 { 1017 /* due to races, always disable */ 1018 disable_branch_tracing(); 1019 } 1020 #else 1021 static inline int trace_branch_enable(struct trace_array *tr) 1022 { 1023 return 0; 1024 } 1025 static inline void trace_branch_disable(void) 1026 { 1027 } 1028 #endif /* CONFIG_BRANCH_TRACER */ 1029 1030 /* set ring buffers to default size if not already done so */ 1031 int tracing_update_buffers(void); 1032 1033 struct ftrace_event_field { 1034 struct list_head link; 1035 const char *name; 1036 const char *type; 1037 int filter_type; 1038 int offset; 1039 int size; 1040 int is_signed; 1041 }; 1042 1043 struct event_filter { 1044 int n_preds; /* Number assigned */ 1045 int a_preds; /* allocated */ 1046 struct filter_pred *preds; 1047 struct filter_pred *root; 1048 char *filter_string; 1049 }; 1050 1051 struct event_subsystem { 1052 struct list_head list; 1053 const char *name; 1054 struct event_filter *filter; 1055 int ref_count; 1056 }; 1057 1058 struct trace_subsystem_dir { 1059 struct list_head list; 1060 struct event_subsystem *subsystem; 1061 struct trace_array *tr; 1062 struct dentry *entry; 1063 int ref_count; 1064 int nr_events; 1065 }; 1066 1067 #define FILTER_PRED_INVALID ((unsigned short)-1) 1068 #define FILTER_PRED_IS_RIGHT (1 << 15) 1069 #define FILTER_PRED_FOLD (1 << 15) 1070 1071 /* 1072 * The max preds is the size of unsigned short with 1073 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1074 * and FOLD flags. The other is reserved. 1075 * 1076 * 2^14 preds is way more than enough. 1077 */ 1078 #define MAX_FILTER_PRED 16384 1079 1080 struct filter_pred; 1081 struct regex; 1082 1083 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1084 1085 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1086 1087 enum regex_type { 1088 MATCH_FULL = 0, 1089 MATCH_FRONT_ONLY, 1090 MATCH_MIDDLE_ONLY, 1091 MATCH_END_ONLY, 1092 }; 1093 1094 struct regex { 1095 char pattern[MAX_FILTER_STR_VAL]; 1096 int len; 1097 int field_len; 1098 regex_match_func match; 1099 }; 1100 1101 struct filter_pred { 1102 filter_pred_fn_t fn; 1103 u64 val; 1104 struct regex regex; 1105 unsigned short *ops; 1106 struct ftrace_event_field *field; 1107 int offset; 1108 int not; 1109 int op; 1110 unsigned short index; 1111 unsigned short parent; 1112 unsigned short left; 1113 unsigned short right; 1114 }; 1115 1116 extern enum regex_type 1117 filter_parse_regex(char *buff, int len, char **search, int *not); 1118 extern void print_event_filter(struct trace_event_file *file, 1119 struct trace_seq *s); 1120 extern int apply_event_filter(struct trace_event_file *file, 1121 char *filter_string); 1122 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1123 char *filter_string); 1124 extern void print_subsystem_event_filter(struct event_subsystem *system, 1125 struct trace_seq *s); 1126 extern int filter_assign_type(const char *type); 1127 extern int create_event_filter(struct trace_event_call *call, 1128 char *filter_str, bool set_str, 1129 struct event_filter **filterp); 1130 extern void free_event_filter(struct event_filter *filter); 1131 1132 struct ftrace_event_field * 1133 trace_find_event_field(struct trace_event_call *call, char *name); 1134 1135 extern void trace_event_enable_cmd_record(bool enable); 1136 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1137 extern int event_trace_del_tracer(struct trace_array *tr); 1138 1139 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1140 const char *system, 1141 const char *event); 1142 1143 static inline void *event_file_data(struct file *filp) 1144 { 1145 return ACCESS_ONCE(file_inode(filp)->i_private); 1146 } 1147 1148 extern struct mutex event_mutex; 1149 extern struct list_head ftrace_events; 1150 1151 extern const struct file_operations event_trigger_fops; 1152 1153 extern int register_trigger_cmds(void); 1154 extern void clear_event_triggers(struct trace_array *tr); 1155 1156 struct event_trigger_data { 1157 unsigned long count; 1158 int ref; 1159 struct event_trigger_ops *ops; 1160 struct event_command *cmd_ops; 1161 struct event_filter __rcu *filter; 1162 char *filter_str; 1163 void *private_data; 1164 struct list_head list; 1165 }; 1166 1167 /** 1168 * struct event_trigger_ops - callbacks for trace event triggers 1169 * 1170 * The methods in this structure provide per-event trigger hooks for 1171 * various trigger operations. 1172 * 1173 * All the methods below, except for @init() and @free(), must be 1174 * implemented. 1175 * 1176 * @func: The trigger 'probe' function called when the triggering 1177 * event occurs. The data passed into this callback is the data 1178 * that was supplied to the event_command @reg() function that 1179 * registered the trigger (see struct event_command). 1180 * 1181 * @init: An optional initialization function called for the trigger 1182 * when the trigger is registered (via the event_command reg() 1183 * function). This can be used to perform per-trigger 1184 * initialization such as incrementing a per-trigger reference 1185 * count, for instance. This is usually implemented by the 1186 * generic utility function @event_trigger_init() (see 1187 * trace_event_triggers.c). 1188 * 1189 * @free: An optional de-initialization function called for the 1190 * trigger when the trigger is unregistered (via the 1191 * event_command @reg() function). This can be used to perform 1192 * per-trigger de-initialization such as decrementing a 1193 * per-trigger reference count and freeing corresponding trigger 1194 * data, for instance. This is usually implemented by the 1195 * generic utility function @event_trigger_free() (see 1196 * trace_event_triggers.c). 1197 * 1198 * @print: The callback function invoked to have the trigger print 1199 * itself. This is usually implemented by a wrapper function 1200 * that calls the generic utility function @event_trigger_print() 1201 * (see trace_event_triggers.c). 1202 */ 1203 struct event_trigger_ops { 1204 void (*func)(struct event_trigger_data *data); 1205 int (*init)(struct event_trigger_ops *ops, 1206 struct event_trigger_data *data); 1207 void (*free)(struct event_trigger_ops *ops, 1208 struct event_trigger_data *data); 1209 int (*print)(struct seq_file *m, 1210 struct event_trigger_ops *ops, 1211 struct event_trigger_data *data); 1212 }; 1213 1214 /** 1215 * struct event_command - callbacks and data members for event commands 1216 * 1217 * Event commands are invoked by users by writing the command name 1218 * into the 'trigger' file associated with a trace event. The 1219 * parameters associated with a specific invocation of an event 1220 * command are used to create an event trigger instance, which is 1221 * added to the list of trigger instances associated with that trace 1222 * event. When the event is hit, the set of triggers associated with 1223 * that event is invoked. 1224 * 1225 * The data members in this structure provide per-event command data 1226 * for various event commands. 1227 * 1228 * All the data members below, except for @post_trigger, must be set 1229 * for each event command. 1230 * 1231 * @name: The unique name that identifies the event command. This is 1232 * the name used when setting triggers via trigger files. 1233 * 1234 * @trigger_type: A unique id that identifies the event command 1235 * 'type'. This value has two purposes, the first to ensure that 1236 * only one trigger of the same type can be set at a given time 1237 * for a particular event e.g. it doesn't make sense to have both 1238 * a traceon and traceoff trigger attached to a single event at 1239 * the same time, so traceon and traceoff have the same type 1240 * though they have different names. The @trigger_type value is 1241 * also used as a bit value for deferring the actual trigger 1242 * action until after the current event is finished. Some 1243 * commands need to do this if they themselves log to the trace 1244 * buffer (see the @post_trigger() member below). @trigger_type 1245 * values are defined by adding new values to the trigger_type 1246 * enum in include/linux/trace_events.h. 1247 * 1248 * @post_trigger: A flag that says whether or not this command needs 1249 * to have its action delayed until after the current event has 1250 * been closed. Some triggers need to avoid being invoked while 1251 * an event is currently in the process of being logged, since 1252 * the trigger may itself log data into the trace buffer. Thus 1253 * we make sure the current event is committed before invoking 1254 * those triggers. To do that, the trigger invocation is split 1255 * in two - the first part checks the filter using the current 1256 * trace record; if a command has the @post_trigger flag set, it 1257 * sets a bit for itself in the return value, otherwise it 1258 * directly invokes the trigger. Once all commands have been 1259 * either invoked or set their return flag, the current record is 1260 * either committed or discarded. At that point, if any commands 1261 * have deferred their triggers, those commands are finally 1262 * invoked following the close of the current event. In other 1263 * words, if the event_trigger_ops @func() probe implementation 1264 * itself logs to the trace buffer, this flag should be set, 1265 * otherwise it can be left unspecified. 1266 * 1267 * All the methods below, except for @set_filter(), must be 1268 * implemented. 1269 * 1270 * @func: The callback function responsible for parsing and 1271 * registering the trigger written to the 'trigger' file by the 1272 * user. It allocates the trigger instance and registers it with 1273 * the appropriate trace event. It makes use of the other 1274 * event_command callback functions to orchestrate this, and is 1275 * usually implemented by the generic utility function 1276 * @event_trigger_callback() (see trace_event_triggers.c). 1277 * 1278 * @reg: Adds the trigger to the list of triggers associated with the 1279 * event, and enables the event trigger itself, after 1280 * initializing it (via the event_trigger_ops @init() function). 1281 * This is also where commands can use the @trigger_type value to 1282 * make the decision as to whether or not multiple instances of 1283 * the trigger should be allowed. This is usually implemented by 1284 * the generic utility function @register_trigger() (see 1285 * trace_event_triggers.c). 1286 * 1287 * @unreg: Removes the trigger from the list of triggers associated 1288 * with the event, and disables the event trigger itself, after 1289 * initializing it (via the event_trigger_ops @free() function). 1290 * This is usually implemented by the generic utility function 1291 * @unregister_trigger() (see trace_event_triggers.c). 1292 * 1293 * @set_filter: An optional function called to parse and set a filter 1294 * for the trigger. If no @set_filter() method is set for the 1295 * event command, filters set by the user for the command will be 1296 * ignored. This is usually implemented by the generic utility 1297 * function @set_trigger_filter() (see trace_event_triggers.c). 1298 * 1299 * @get_trigger_ops: The callback function invoked to retrieve the 1300 * event_trigger_ops implementation associated with the command. 1301 */ 1302 struct event_command { 1303 struct list_head list; 1304 char *name; 1305 enum event_trigger_type trigger_type; 1306 bool post_trigger; 1307 int (*func)(struct event_command *cmd_ops, 1308 struct trace_event_file *file, 1309 char *glob, char *cmd, char *params); 1310 int (*reg)(char *glob, 1311 struct event_trigger_ops *ops, 1312 struct event_trigger_data *data, 1313 struct trace_event_file *file); 1314 void (*unreg)(char *glob, 1315 struct event_trigger_ops *ops, 1316 struct event_trigger_data *data, 1317 struct trace_event_file *file); 1318 int (*set_filter)(char *filter_str, 1319 struct event_trigger_data *data, 1320 struct trace_event_file *file); 1321 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1322 }; 1323 1324 extern int trace_event_enable_disable(struct trace_event_file *file, 1325 int enable, int soft_disable); 1326 extern int tracing_alloc_snapshot(void); 1327 1328 extern const char *__start___trace_bprintk_fmt[]; 1329 extern const char *__stop___trace_bprintk_fmt[]; 1330 1331 extern const char *__start___tracepoint_str[]; 1332 extern const char *__stop___tracepoint_str[]; 1333 1334 void trace_printk_control(bool enabled); 1335 void trace_printk_init_buffers(void); 1336 void trace_printk_start_comm(void); 1337 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1338 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1339 1340 /* 1341 * Normal trace_printk() and friends allocates special buffers 1342 * to do the manipulation, as well as saves the print formats 1343 * into sections to display. But the trace infrastructure wants 1344 * to use these without the added overhead at the price of being 1345 * a bit slower (used mainly for warnings, where we don't care 1346 * about performance). The internal_trace_puts() is for such 1347 * a purpose. 1348 */ 1349 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1350 1351 #undef FTRACE_ENTRY 1352 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1353 extern struct trace_event_call \ 1354 __aligned(4) event_##call; 1355 #undef FTRACE_ENTRY_DUP 1356 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1357 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1358 filter) 1359 #include "trace_entries.h" 1360 1361 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1362 int perf_ftrace_event_register(struct trace_event_call *call, 1363 enum trace_reg type, void *data); 1364 #else 1365 #define perf_ftrace_event_register NULL 1366 #endif 1367 1368 #ifdef CONFIG_FTRACE_SYSCALLS 1369 void init_ftrace_syscalls(void); 1370 #else 1371 static inline void init_ftrace_syscalls(void) { } 1372 #endif 1373 1374 #ifdef CONFIG_EVENT_TRACING 1375 void trace_event_init(void); 1376 void trace_event_enum_update(struct trace_enum_map **map, int len); 1377 #else 1378 static inline void __init trace_event_init(void) { } 1379 static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { } 1380 #endif 1381 1382 extern struct trace_iterator *tracepoint_print_iter; 1383 1384 #endif /* _LINUX_KERNEL_TRACE_H */ 1385