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/ftrace_event.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 TP_ARGS 75 #define TP_ARGS(args...) args 76 77 #undef FTRACE_ENTRY_DUP 78 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) 79 80 #undef FTRACE_ENTRY_REG 81 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 82 filter, regfn) \ 83 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 84 filter) 85 86 #include "trace_entries.h" 87 88 /* 89 * syscalls are special, and need special handling, this is why 90 * they are not included in trace_entries.h 91 */ 92 struct syscall_trace_enter { 93 struct trace_entry ent; 94 int nr; 95 unsigned long args[]; 96 }; 97 98 struct syscall_trace_exit { 99 struct trace_entry ent; 100 int nr; 101 long ret; 102 }; 103 104 struct kprobe_trace_entry_head { 105 struct trace_entry ent; 106 unsigned long ip; 107 }; 108 109 struct kretprobe_trace_entry_head { 110 struct trace_entry ent; 111 unsigned long func; 112 unsigned long ret_ip; 113 }; 114 115 /* 116 * trace_flag_type is an enumeration that holds different 117 * states when a trace occurs. These are: 118 * IRQS_OFF - interrupts were disabled 119 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 120 * NEED_RESCHED - reschedule is requested 121 * HARDIRQ - inside an interrupt handler 122 * SOFTIRQ - inside a softirq handler 123 */ 124 enum trace_flag_type { 125 TRACE_FLAG_IRQS_OFF = 0x01, 126 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 127 TRACE_FLAG_NEED_RESCHED = 0x04, 128 TRACE_FLAG_HARDIRQ = 0x08, 129 TRACE_FLAG_SOFTIRQ = 0x10, 130 TRACE_FLAG_PREEMPT_RESCHED = 0x20, 131 }; 132 133 #define TRACE_BUF_SIZE 1024 134 135 struct trace_array; 136 137 /* 138 * The CPU trace array - it consists of thousands of trace entries 139 * plus some other descriptor data: (for example which task started 140 * the trace, etc.) 141 */ 142 struct trace_array_cpu { 143 atomic_t disabled; 144 void *buffer_page; /* ring buffer spare */ 145 146 unsigned long entries; 147 unsigned long saved_latency; 148 unsigned long critical_start; 149 unsigned long critical_end; 150 unsigned long critical_sequence; 151 unsigned long nice; 152 unsigned long policy; 153 unsigned long rt_priority; 154 unsigned long skipped_entries; 155 cycle_t preempt_timestamp; 156 pid_t pid; 157 kuid_t uid; 158 char comm[TASK_COMM_LEN]; 159 }; 160 161 struct tracer; 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 /* 172 * The trace array - an array of per-CPU trace arrays. This is the 173 * highest level data structure that individual tracers deal with. 174 * They have on/off state as well: 175 */ 176 struct trace_array { 177 struct list_head list; 178 char *name; 179 struct trace_buffer trace_buffer; 180 #ifdef CONFIG_TRACER_MAX_TRACE 181 /* 182 * The max_buffer is used to snapshot the trace when a maximum 183 * latency is reached, or when the user initiates a snapshot. 184 * Some tracers will use this to store a maximum trace while 185 * it continues examining live traces. 186 * 187 * The buffers for the max_buffer are set up the same as the trace_buffer 188 * When a snapshot is taken, the buffer of the max_buffer is swapped 189 * with the buffer of the trace_buffer and the buffers are reset for 190 * the trace_buffer so the tracing can continue. 191 */ 192 struct trace_buffer max_buffer; 193 bool allocated_snapshot; 194 unsigned long max_latency; 195 #endif 196 /* 197 * max_lock is used to protect the swapping of buffers 198 * when taking a max snapshot. The buffers themselves are 199 * protected by per_cpu spinlocks. But the action of the swap 200 * needs its own lock. 201 * 202 * This is defined as a arch_spinlock_t in order to help 203 * with performance when lockdep debugging is enabled. 204 * 205 * It is also used in other places outside the update_max_tr 206 * so it needs to be defined outside of the 207 * CONFIG_TRACER_MAX_TRACE. 208 */ 209 arch_spinlock_t max_lock; 210 int buffer_disabled; 211 #ifdef CONFIG_FTRACE_SYSCALLS 212 int sys_refcount_enter; 213 int sys_refcount_exit; 214 struct ftrace_event_file __rcu *enter_syscall_files[NR_syscalls]; 215 struct ftrace_event_file __rcu *exit_syscall_files[NR_syscalls]; 216 #endif 217 int stop_count; 218 int clock_id; 219 struct tracer *current_trace; 220 unsigned int flags; 221 raw_spinlock_t start_lock; 222 struct dentry *dir; 223 struct dentry *options; 224 struct dentry *percpu_dir; 225 struct dentry *event_dir; 226 struct list_head systems; 227 struct list_head events; 228 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 229 int ref; 230 #ifdef CONFIG_FUNCTION_TRACER 231 struct ftrace_ops *ops; 232 /* function tracing enabled */ 233 int function_enabled; 234 #endif 235 }; 236 237 enum { 238 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 239 }; 240 241 extern struct list_head ftrace_trace_arrays; 242 243 extern struct mutex trace_types_lock; 244 245 extern int trace_array_get(struct trace_array *tr); 246 extern void trace_array_put(struct trace_array *tr); 247 248 /* 249 * The global tracer (top) should be the first trace array added, 250 * but we check the flag anyway. 251 */ 252 static inline struct trace_array *top_trace_array(void) 253 { 254 struct trace_array *tr; 255 256 if (list_empty(&ftrace_trace_arrays)) 257 return NULL; 258 259 tr = list_entry(ftrace_trace_arrays.prev, 260 typeof(*tr), list); 261 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 262 return tr; 263 } 264 265 #define FTRACE_CMP_TYPE(var, type) \ 266 __builtin_types_compatible_p(typeof(var), type *) 267 268 #undef IF_ASSIGN 269 #define IF_ASSIGN(var, entry, etype, id) \ 270 if (FTRACE_CMP_TYPE(var, etype)) { \ 271 var = (typeof(var))(entry); \ 272 WARN_ON(id && (entry)->type != id); \ 273 break; \ 274 } 275 276 /* Will cause compile errors if type is not found. */ 277 extern void __ftrace_bad_type(void); 278 279 /* 280 * The trace_assign_type is a verifier that the entry type is 281 * the same as the type being assigned. To add new types simply 282 * add a line with the following format: 283 * 284 * IF_ASSIGN(var, ent, type, id); 285 * 286 * Where "type" is the trace type that includes the trace_entry 287 * as the "ent" item. And "id" is the trace identifier that is 288 * used in the trace_type enum. 289 * 290 * If the type can have more than one id, then use zero. 291 */ 292 #define trace_assign_type(var, ent) \ 293 do { \ 294 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 295 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 296 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 297 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 298 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 299 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 300 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 301 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 302 TRACE_MMIO_RW); \ 303 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 304 TRACE_MMIO_MAP); \ 305 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 306 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 307 TRACE_GRAPH_ENT); \ 308 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 309 TRACE_GRAPH_RET); \ 310 __ftrace_bad_type(); \ 311 } while (0) 312 313 /* 314 * An option specific to a tracer. This is a boolean value. 315 * The bit is the bit index that sets its value on the 316 * flags value in struct tracer_flags. 317 */ 318 struct tracer_opt { 319 const char *name; /* Will appear on the trace_options file */ 320 u32 bit; /* Mask assigned in val field in tracer_flags */ 321 }; 322 323 /* 324 * The set of specific options for a tracer. Your tracer 325 * have to set the initial value of the flags val. 326 */ 327 struct tracer_flags { 328 u32 val; 329 struct tracer_opt *opts; 330 }; 331 332 /* Makes more easy to define a tracer opt */ 333 #define TRACER_OPT(s, b) .name = #s, .bit = b 334 335 336 /** 337 * struct tracer - a specific tracer and its callbacks to interact with debugfs 338 * @name: the name chosen to select it on the available_tracers file 339 * @init: called when one switches to this tracer (echo name > current_tracer) 340 * @reset: called when one switches to another tracer 341 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 342 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 343 * @update_thresh: called when tracing_thresh is updated 344 * @open: called when the trace file is opened 345 * @pipe_open: called when the trace_pipe file is opened 346 * @close: called when the trace file is released 347 * @pipe_close: called when the trace_pipe file is released 348 * @read: override the default read callback on trace_pipe 349 * @splice_read: override the default splice_read callback on trace_pipe 350 * @selftest: selftest to run on boot (see trace_selftest.c) 351 * @print_headers: override the first lines that describe your columns 352 * @print_line: callback that prints a trace 353 * @set_flag: signals one of your private flags changed (trace_options file) 354 * @flags: your private flags 355 */ 356 struct tracer { 357 const char *name; 358 int (*init)(struct trace_array *tr); 359 void (*reset)(struct trace_array *tr); 360 void (*start)(struct trace_array *tr); 361 void (*stop)(struct trace_array *tr); 362 int (*update_thresh)(struct trace_array *tr); 363 void (*open)(struct trace_iterator *iter); 364 void (*pipe_open)(struct trace_iterator *iter); 365 void (*close)(struct trace_iterator *iter); 366 void (*pipe_close)(struct trace_iterator *iter); 367 ssize_t (*read)(struct trace_iterator *iter, 368 struct file *filp, char __user *ubuf, 369 size_t cnt, loff_t *ppos); 370 ssize_t (*splice_read)(struct trace_iterator *iter, 371 struct file *filp, 372 loff_t *ppos, 373 struct pipe_inode_info *pipe, 374 size_t len, 375 unsigned int flags); 376 #ifdef CONFIG_FTRACE_STARTUP_TEST 377 int (*selftest)(struct tracer *trace, 378 struct trace_array *tr); 379 #endif 380 void (*print_header)(struct seq_file *m); 381 enum print_line_t (*print_line)(struct trace_iterator *iter); 382 /* If you handled the flag setting, return 0 */ 383 int (*set_flag)(struct trace_array *tr, 384 u32 old_flags, u32 bit, int set); 385 /* Return 0 if OK with change, else return non-zero */ 386 int (*flag_changed)(struct trace_array *tr, 387 u32 mask, int set); 388 struct tracer *next; 389 struct tracer_flags *flags; 390 int enabled; 391 bool print_max; 392 bool allow_instances; 393 #ifdef CONFIG_TRACER_MAX_TRACE 394 bool use_max_tr; 395 #endif 396 }; 397 398 399 /* Only current can touch trace_recursion */ 400 401 /* 402 * For function tracing recursion: 403 * The order of these bits are important. 404 * 405 * When function tracing occurs, the following steps are made: 406 * If arch does not support a ftrace feature: 407 * call internal function (uses INTERNAL bits) which calls... 408 * If callback is registered to the "global" list, the list 409 * function is called and recursion checks the GLOBAL bits. 410 * then this function calls... 411 * The function callback, which can use the FTRACE bits to 412 * check for recursion. 413 * 414 * Now if the arch does not suppport a feature, and it calls 415 * the global list function which calls the ftrace callback 416 * all three of these steps will do a recursion protection. 417 * There's no reason to do one if the previous caller already 418 * did. The recursion that we are protecting against will 419 * go through the same steps again. 420 * 421 * To prevent the multiple recursion checks, if a recursion 422 * bit is set that is higher than the MAX bit of the current 423 * check, then we know that the check was made by the previous 424 * caller, and we can skip the current check. 425 */ 426 enum { 427 TRACE_BUFFER_BIT, 428 TRACE_BUFFER_NMI_BIT, 429 TRACE_BUFFER_IRQ_BIT, 430 TRACE_BUFFER_SIRQ_BIT, 431 432 /* Start of function recursion bits */ 433 TRACE_FTRACE_BIT, 434 TRACE_FTRACE_NMI_BIT, 435 TRACE_FTRACE_IRQ_BIT, 436 TRACE_FTRACE_SIRQ_BIT, 437 438 /* INTERNAL_BITs must be greater than FTRACE_BITs */ 439 TRACE_INTERNAL_BIT, 440 TRACE_INTERNAL_NMI_BIT, 441 TRACE_INTERNAL_IRQ_BIT, 442 TRACE_INTERNAL_SIRQ_BIT, 443 444 TRACE_CONTROL_BIT, 445 446 /* 447 * Abuse of the trace_recursion. 448 * As we need a way to maintain state if we are tracing the function 449 * graph in irq because we want to trace a particular function that 450 * was called in irq context but we have irq tracing off. Since this 451 * can only be modified by current, we can reuse trace_recursion. 452 */ 453 TRACE_IRQ_BIT, 454 }; 455 456 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 457 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 458 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 459 460 #define TRACE_CONTEXT_BITS 4 461 462 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 463 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 464 465 #define TRACE_LIST_START TRACE_INTERNAL_BIT 466 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 467 468 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 469 470 static __always_inline int trace_get_context_bit(void) 471 { 472 int bit; 473 474 if (in_interrupt()) { 475 if (in_nmi()) 476 bit = 0; 477 478 else if (in_irq()) 479 bit = 1; 480 else 481 bit = 2; 482 } else 483 bit = 3; 484 485 return bit; 486 } 487 488 static __always_inline int trace_test_and_set_recursion(int start, int max) 489 { 490 unsigned int val = current->trace_recursion; 491 int bit; 492 493 /* A previous recursion check was made */ 494 if ((val & TRACE_CONTEXT_MASK) > max) 495 return 0; 496 497 bit = trace_get_context_bit() + start; 498 if (unlikely(val & (1 << bit))) 499 return -1; 500 501 val |= 1 << bit; 502 current->trace_recursion = val; 503 barrier(); 504 505 return bit; 506 } 507 508 static __always_inline void trace_clear_recursion(int bit) 509 { 510 unsigned int val = current->trace_recursion; 511 512 if (!bit) 513 return; 514 515 bit = 1 << bit; 516 val &= ~bit; 517 518 barrier(); 519 current->trace_recursion = val; 520 } 521 522 static inline struct ring_buffer_iter * 523 trace_buffer_iter(struct trace_iterator *iter, int cpu) 524 { 525 if (iter->buffer_iter && iter->buffer_iter[cpu]) 526 return iter->buffer_iter[cpu]; 527 return NULL; 528 } 529 530 int tracer_init(struct tracer *t, struct trace_array *tr); 531 int tracing_is_enabled(void); 532 void tracing_reset(struct trace_buffer *buf, int cpu); 533 void tracing_reset_online_cpus(struct trace_buffer *buf); 534 void tracing_reset_current(int cpu); 535 void tracing_reset_all_online_cpus(void); 536 int tracing_open_generic(struct inode *inode, struct file *filp); 537 bool tracing_is_disabled(void); 538 struct dentry *trace_create_file(const char *name, 539 umode_t mode, 540 struct dentry *parent, 541 void *data, 542 const struct file_operations *fops); 543 544 struct dentry *tracing_init_dentry_tr(struct trace_array *tr); 545 struct dentry *tracing_init_dentry(void); 546 547 struct ring_buffer_event; 548 549 struct ring_buffer_event * 550 trace_buffer_lock_reserve(struct ring_buffer *buffer, 551 int type, 552 unsigned long len, 553 unsigned long flags, 554 int pc); 555 556 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 557 struct trace_array_cpu *data); 558 559 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 560 int *ent_cpu, u64 *ent_ts); 561 562 void __buffer_unlock_commit(struct ring_buffer *buffer, 563 struct ring_buffer_event *event); 564 565 int trace_empty(struct trace_iterator *iter); 566 567 void *trace_find_next_entry_inc(struct trace_iterator *iter); 568 569 void trace_init_global_iter(struct trace_iterator *iter); 570 571 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 572 573 void trace_function(struct trace_array *tr, 574 unsigned long ip, 575 unsigned long parent_ip, 576 unsigned long flags, int pc); 577 void trace_graph_function(struct trace_array *tr, 578 unsigned long ip, 579 unsigned long parent_ip, 580 unsigned long flags, int pc); 581 void trace_latency_header(struct seq_file *m); 582 void trace_default_header(struct seq_file *m); 583 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 584 int trace_empty(struct trace_iterator *iter); 585 586 void trace_graph_return(struct ftrace_graph_ret *trace); 587 int trace_graph_entry(struct ftrace_graph_ent *trace); 588 void set_graph_array(struct trace_array *tr); 589 590 void tracing_start_cmdline_record(void); 591 void tracing_stop_cmdline_record(void); 592 int register_tracer(struct tracer *type); 593 int is_tracing_stopped(void); 594 595 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 596 597 extern cpumask_var_t __read_mostly tracing_buffer_mask; 598 599 #define for_each_tracing_cpu(cpu) \ 600 for_each_cpu(cpu, tracing_buffer_mask) 601 602 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 603 604 extern unsigned long tracing_thresh; 605 606 #ifdef CONFIG_TRACER_MAX_TRACE 607 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 608 void update_max_tr_single(struct trace_array *tr, 609 struct task_struct *tsk, int cpu); 610 #endif /* CONFIG_TRACER_MAX_TRACE */ 611 612 #ifdef CONFIG_STACKTRACE 613 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 614 int skip, int pc); 615 616 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, 617 int skip, int pc, struct pt_regs *regs); 618 619 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 620 int pc); 621 622 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 623 int pc); 624 #else 625 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 626 unsigned long flags, int skip, int pc) 627 { 628 } 629 630 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, 631 unsigned long flags, int skip, 632 int pc, struct pt_regs *regs) 633 { 634 } 635 636 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 637 unsigned long flags, int pc) 638 { 639 } 640 641 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 642 int skip, int pc) 643 { 644 } 645 #endif /* CONFIG_STACKTRACE */ 646 647 extern cycle_t ftrace_now(int cpu); 648 649 extern void trace_find_cmdline(int pid, char comm[]); 650 651 #ifdef CONFIG_DYNAMIC_FTRACE 652 extern unsigned long ftrace_update_tot_cnt; 653 #endif 654 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 655 extern int DYN_FTRACE_TEST_NAME(void); 656 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 657 extern int DYN_FTRACE_TEST_NAME2(void); 658 659 extern bool ring_buffer_expanded; 660 extern bool tracing_selftest_disabled; 661 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 662 663 #ifdef CONFIG_FTRACE_STARTUP_TEST 664 extern int trace_selftest_startup_function(struct tracer *trace, 665 struct trace_array *tr); 666 extern int trace_selftest_startup_function_graph(struct tracer *trace, 667 struct trace_array *tr); 668 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 669 struct trace_array *tr); 670 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 671 struct trace_array *tr); 672 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 673 struct trace_array *tr); 674 extern int trace_selftest_startup_wakeup(struct tracer *trace, 675 struct trace_array *tr); 676 extern int trace_selftest_startup_nop(struct tracer *trace, 677 struct trace_array *tr); 678 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 679 struct trace_array *tr); 680 extern int trace_selftest_startup_branch(struct tracer *trace, 681 struct trace_array *tr); 682 /* 683 * Tracer data references selftest functions that only occur 684 * on boot up. These can be __init functions. Thus, when selftests 685 * are enabled, then the tracers need to reference __init functions. 686 */ 687 #define __tracer_data __refdata 688 #else 689 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 690 #define __tracer_data __read_mostly 691 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 692 693 extern void *head_page(struct trace_array_cpu *data); 694 extern unsigned long long ns2usecs(cycle_t nsec); 695 extern int 696 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 697 extern int 698 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 699 extern int 700 trace_array_vprintk(struct trace_array *tr, 701 unsigned long ip, const char *fmt, va_list args); 702 int trace_array_printk(struct trace_array *tr, 703 unsigned long ip, const char *fmt, ...); 704 int trace_array_printk_buf(struct ring_buffer *buffer, 705 unsigned long ip, const char *fmt, ...); 706 void trace_printk_seq(struct trace_seq *s); 707 enum print_line_t print_trace_line(struct trace_iterator *iter); 708 709 extern unsigned long trace_flags; 710 711 extern char trace_find_mark(unsigned long long duration); 712 713 /* Standard output formatting function used for function return traces */ 714 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 715 716 /* Flag options */ 717 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 718 #define TRACE_GRAPH_PRINT_CPU 0x2 719 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 720 #define TRACE_GRAPH_PRINT_PROC 0x8 721 #define TRACE_GRAPH_PRINT_DURATION 0x10 722 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 723 #define TRACE_GRAPH_PRINT_IRQS 0x40 724 #define TRACE_GRAPH_PRINT_TAIL 0x80 725 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 726 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 727 728 extern enum print_line_t 729 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 730 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 731 extern void 732 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 733 extern void graph_trace_open(struct trace_iterator *iter); 734 extern void graph_trace_close(struct trace_iterator *iter); 735 extern int __trace_graph_entry(struct trace_array *tr, 736 struct ftrace_graph_ent *trace, 737 unsigned long flags, int pc); 738 extern void __trace_graph_return(struct trace_array *tr, 739 struct ftrace_graph_ret *trace, 740 unsigned long flags, int pc); 741 742 743 #ifdef CONFIG_DYNAMIC_FTRACE 744 /* TODO: make this variable */ 745 #define FTRACE_GRAPH_MAX_FUNCS 32 746 extern int ftrace_graph_count; 747 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 748 extern int ftrace_graph_notrace_count; 749 extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; 750 751 static inline int ftrace_graph_addr(unsigned long addr) 752 { 753 int i; 754 755 if (!ftrace_graph_count) 756 return 1; 757 758 for (i = 0; i < ftrace_graph_count; i++) { 759 if (addr == ftrace_graph_funcs[i]) { 760 /* 761 * If no irqs are to be traced, but a set_graph_function 762 * is set, and called by an interrupt handler, we still 763 * want to trace it. 764 */ 765 if (in_irq()) 766 trace_recursion_set(TRACE_IRQ_BIT); 767 else 768 trace_recursion_clear(TRACE_IRQ_BIT); 769 return 1; 770 } 771 } 772 773 return 0; 774 } 775 776 static inline int ftrace_graph_notrace_addr(unsigned long addr) 777 { 778 int i; 779 780 if (!ftrace_graph_notrace_count) 781 return 0; 782 783 for (i = 0; i < ftrace_graph_notrace_count; i++) { 784 if (addr == ftrace_graph_notrace_funcs[i]) 785 return 1; 786 } 787 788 return 0; 789 } 790 #else 791 static inline int ftrace_graph_addr(unsigned long addr) 792 { 793 return 1; 794 } 795 796 static inline int ftrace_graph_notrace_addr(unsigned long addr) 797 { 798 return 0; 799 } 800 #endif /* CONFIG_DYNAMIC_FTRACE */ 801 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 802 static inline enum print_line_t 803 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 804 { 805 return TRACE_TYPE_UNHANDLED; 806 } 807 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 808 809 extern struct list_head ftrace_pids; 810 811 #ifdef CONFIG_FUNCTION_TRACER 812 extern bool ftrace_filter_param __initdata; 813 static inline int ftrace_trace_task(struct task_struct *task) 814 { 815 if (list_empty(&ftrace_pids)) 816 return 1; 817 818 return test_tsk_trace_trace(task); 819 } 820 extern int ftrace_is_dead(void); 821 int ftrace_create_function_files(struct trace_array *tr, 822 struct dentry *parent); 823 void ftrace_destroy_function_files(struct trace_array *tr); 824 void ftrace_init_global_array_ops(struct trace_array *tr); 825 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 826 void ftrace_reset_array_ops(struct trace_array *tr); 827 int using_ftrace_ops_list_func(void); 828 #else 829 static inline int ftrace_trace_task(struct task_struct *task) 830 { 831 return 1; 832 } 833 static inline int ftrace_is_dead(void) { return 0; } 834 static inline int 835 ftrace_create_function_files(struct trace_array *tr, 836 struct dentry *parent) 837 { 838 return 0; 839 } 840 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 841 static inline __init void 842 ftrace_init_global_array_ops(struct trace_array *tr) { } 843 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 844 /* ftace_func_t type is not defined, use macro instead of static inline */ 845 #define ftrace_init_array_ops(tr, func) do { } while (0) 846 #endif /* CONFIG_FUNCTION_TRACER */ 847 848 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 849 void ftrace_create_filter_files(struct ftrace_ops *ops, 850 struct dentry *parent); 851 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 852 #else 853 /* 854 * The ops parameter passed in is usually undefined. 855 * This must be a macro. 856 */ 857 #define ftrace_create_filter_files(ops, parent) do { } while (0) 858 #define ftrace_destroy_filter_files(ops) do { } while (0) 859 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 860 861 int ftrace_event_is_function(struct ftrace_event_call *call); 862 863 /* 864 * struct trace_parser - servers for reading the user input separated by spaces 865 * @cont: set if the input is not complete - no final space char was found 866 * @buffer: holds the parsed user input 867 * @idx: user input length 868 * @size: buffer size 869 */ 870 struct trace_parser { 871 bool cont; 872 char *buffer; 873 unsigned idx; 874 unsigned size; 875 }; 876 877 static inline bool trace_parser_loaded(struct trace_parser *parser) 878 { 879 return (parser->idx != 0); 880 } 881 882 static inline bool trace_parser_cont(struct trace_parser *parser) 883 { 884 return parser->cont; 885 } 886 887 static inline void trace_parser_clear(struct trace_parser *parser) 888 { 889 parser->cont = false; 890 parser->idx = 0; 891 } 892 893 extern int trace_parser_get_init(struct trace_parser *parser, int size); 894 extern void trace_parser_put(struct trace_parser *parser); 895 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 896 size_t cnt, loff_t *ppos); 897 898 /* 899 * trace_iterator_flags is an enumeration that defines bit 900 * positions into trace_flags that controls the output. 901 * 902 * NOTE: These bits must match the trace_options array in 903 * trace.c. 904 */ 905 enum trace_iterator_flags { 906 TRACE_ITER_PRINT_PARENT = 0x01, 907 TRACE_ITER_SYM_OFFSET = 0x02, 908 TRACE_ITER_SYM_ADDR = 0x04, 909 TRACE_ITER_VERBOSE = 0x08, 910 TRACE_ITER_RAW = 0x10, 911 TRACE_ITER_HEX = 0x20, 912 TRACE_ITER_BIN = 0x40, 913 TRACE_ITER_BLOCK = 0x80, 914 TRACE_ITER_STACKTRACE = 0x100, 915 TRACE_ITER_PRINTK = 0x200, 916 TRACE_ITER_PREEMPTONLY = 0x400, 917 TRACE_ITER_BRANCH = 0x800, 918 TRACE_ITER_ANNOTATE = 0x1000, 919 TRACE_ITER_USERSTACKTRACE = 0x2000, 920 TRACE_ITER_SYM_USEROBJ = 0x4000, 921 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 922 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 923 TRACE_ITER_LATENCY_FMT = 0x20000, 924 TRACE_ITER_SLEEP_TIME = 0x40000, 925 TRACE_ITER_GRAPH_TIME = 0x80000, 926 TRACE_ITER_RECORD_CMD = 0x100000, 927 TRACE_ITER_OVERWRITE = 0x200000, 928 TRACE_ITER_STOP_ON_FREE = 0x400000, 929 TRACE_ITER_IRQ_INFO = 0x800000, 930 TRACE_ITER_MARKERS = 0x1000000, 931 TRACE_ITER_FUNCTION = 0x2000000, 932 }; 933 934 /* 935 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 936 * control the output of kernel symbols. 937 */ 938 #define TRACE_ITER_SYM_MASK \ 939 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 940 941 extern struct tracer nop_trace; 942 943 #ifdef CONFIG_BRANCH_TRACER 944 extern int enable_branch_tracing(struct trace_array *tr); 945 extern void disable_branch_tracing(void); 946 static inline int trace_branch_enable(struct trace_array *tr) 947 { 948 if (trace_flags & TRACE_ITER_BRANCH) 949 return enable_branch_tracing(tr); 950 return 0; 951 } 952 static inline void trace_branch_disable(void) 953 { 954 /* due to races, always disable */ 955 disable_branch_tracing(); 956 } 957 #else 958 static inline int trace_branch_enable(struct trace_array *tr) 959 { 960 return 0; 961 } 962 static inline void trace_branch_disable(void) 963 { 964 } 965 #endif /* CONFIG_BRANCH_TRACER */ 966 967 /* set ring buffers to default size if not already done so */ 968 int tracing_update_buffers(void); 969 970 struct ftrace_event_field { 971 struct list_head link; 972 const char *name; 973 const char *type; 974 int filter_type; 975 int offset; 976 int size; 977 int is_signed; 978 }; 979 980 struct event_filter { 981 int n_preds; /* Number assigned */ 982 int a_preds; /* allocated */ 983 struct filter_pred *preds; 984 struct filter_pred *root; 985 char *filter_string; 986 }; 987 988 struct event_subsystem { 989 struct list_head list; 990 const char *name; 991 struct event_filter *filter; 992 int ref_count; 993 }; 994 995 struct ftrace_subsystem_dir { 996 struct list_head list; 997 struct event_subsystem *subsystem; 998 struct trace_array *tr; 999 struct dentry *entry; 1000 int ref_count; 1001 int nr_events; 1002 }; 1003 1004 #define FILTER_PRED_INVALID ((unsigned short)-1) 1005 #define FILTER_PRED_IS_RIGHT (1 << 15) 1006 #define FILTER_PRED_FOLD (1 << 15) 1007 1008 /* 1009 * The max preds is the size of unsigned short with 1010 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1011 * and FOLD flags. The other is reserved. 1012 * 1013 * 2^14 preds is way more than enough. 1014 */ 1015 #define MAX_FILTER_PRED 16384 1016 1017 struct filter_pred; 1018 struct regex; 1019 1020 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1021 1022 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1023 1024 enum regex_type { 1025 MATCH_FULL = 0, 1026 MATCH_FRONT_ONLY, 1027 MATCH_MIDDLE_ONLY, 1028 MATCH_END_ONLY, 1029 }; 1030 1031 struct regex { 1032 char pattern[MAX_FILTER_STR_VAL]; 1033 int len; 1034 int field_len; 1035 regex_match_func match; 1036 }; 1037 1038 struct filter_pred { 1039 filter_pred_fn_t fn; 1040 u64 val; 1041 struct regex regex; 1042 unsigned short *ops; 1043 struct ftrace_event_field *field; 1044 int offset; 1045 int not; 1046 int op; 1047 unsigned short index; 1048 unsigned short parent; 1049 unsigned short left; 1050 unsigned short right; 1051 }; 1052 1053 extern enum regex_type 1054 filter_parse_regex(char *buff, int len, char **search, int *not); 1055 extern void print_event_filter(struct ftrace_event_file *file, 1056 struct trace_seq *s); 1057 extern int apply_event_filter(struct ftrace_event_file *file, 1058 char *filter_string); 1059 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir, 1060 char *filter_string); 1061 extern void print_subsystem_event_filter(struct event_subsystem *system, 1062 struct trace_seq *s); 1063 extern int filter_assign_type(const char *type); 1064 extern int create_event_filter(struct ftrace_event_call *call, 1065 char *filter_str, bool set_str, 1066 struct event_filter **filterp); 1067 extern void free_event_filter(struct event_filter *filter); 1068 1069 struct ftrace_event_field * 1070 trace_find_event_field(struct ftrace_event_call *call, char *name); 1071 1072 extern void trace_event_enable_cmd_record(bool enable); 1073 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1074 extern int event_trace_del_tracer(struct trace_array *tr); 1075 1076 extern struct ftrace_event_file *find_event_file(struct trace_array *tr, 1077 const char *system, 1078 const char *event); 1079 1080 static inline void *event_file_data(struct file *filp) 1081 { 1082 return ACCESS_ONCE(file_inode(filp)->i_private); 1083 } 1084 1085 extern struct mutex event_mutex; 1086 extern struct list_head ftrace_events; 1087 1088 extern const struct file_operations event_trigger_fops; 1089 1090 extern int register_trigger_cmds(void); 1091 extern void clear_event_triggers(struct trace_array *tr); 1092 1093 struct event_trigger_data { 1094 unsigned long count; 1095 int ref; 1096 struct event_trigger_ops *ops; 1097 struct event_command *cmd_ops; 1098 struct event_filter __rcu *filter; 1099 char *filter_str; 1100 void *private_data; 1101 struct list_head list; 1102 }; 1103 1104 /** 1105 * struct event_trigger_ops - callbacks for trace event triggers 1106 * 1107 * The methods in this structure provide per-event trigger hooks for 1108 * various trigger operations. 1109 * 1110 * All the methods below, except for @init() and @free(), must be 1111 * implemented. 1112 * 1113 * @func: The trigger 'probe' function called when the triggering 1114 * event occurs. The data passed into this callback is the data 1115 * that was supplied to the event_command @reg() function that 1116 * registered the trigger (see struct event_command). 1117 * 1118 * @init: An optional initialization function called for the trigger 1119 * when the trigger is registered (via the event_command reg() 1120 * function). This can be used to perform per-trigger 1121 * initialization such as incrementing a per-trigger reference 1122 * count, for instance. This is usually implemented by the 1123 * generic utility function @event_trigger_init() (see 1124 * trace_event_triggers.c). 1125 * 1126 * @free: An optional de-initialization function called for the 1127 * trigger when the trigger is unregistered (via the 1128 * event_command @reg() function). This can be used to perform 1129 * per-trigger de-initialization such as decrementing a 1130 * per-trigger reference count and freeing corresponding trigger 1131 * data, for instance. This is usually implemented by the 1132 * generic utility function @event_trigger_free() (see 1133 * trace_event_triggers.c). 1134 * 1135 * @print: The callback function invoked to have the trigger print 1136 * itself. This is usually implemented by a wrapper function 1137 * that calls the generic utility function @event_trigger_print() 1138 * (see trace_event_triggers.c). 1139 */ 1140 struct event_trigger_ops { 1141 void (*func)(struct event_trigger_data *data); 1142 int (*init)(struct event_trigger_ops *ops, 1143 struct event_trigger_data *data); 1144 void (*free)(struct event_trigger_ops *ops, 1145 struct event_trigger_data *data); 1146 int (*print)(struct seq_file *m, 1147 struct event_trigger_ops *ops, 1148 struct event_trigger_data *data); 1149 }; 1150 1151 /** 1152 * struct event_command - callbacks and data members for event commands 1153 * 1154 * Event commands are invoked by users by writing the command name 1155 * into the 'trigger' file associated with a trace event. The 1156 * parameters associated with a specific invocation of an event 1157 * command are used to create an event trigger instance, which is 1158 * added to the list of trigger instances associated with that trace 1159 * event. When the event is hit, the set of triggers associated with 1160 * that event is invoked. 1161 * 1162 * The data members in this structure provide per-event command data 1163 * for various event commands. 1164 * 1165 * All the data members below, except for @post_trigger, must be set 1166 * for each event command. 1167 * 1168 * @name: The unique name that identifies the event command. This is 1169 * the name used when setting triggers via trigger files. 1170 * 1171 * @trigger_type: A unique id that identifies the event command 1172 * 'type'. This value has two purposes, the first to ensure that 1173 * only one trigger of the same type can be set at a given time 1174 * for a particular event e.g. it doesn't make sense to have both 1175 * a traceon and traceoff trigger attached to a single event at 1176 * the same time, so traceon and traceoff have the same type 1177 * though they have different names. The @trigger_type value is 1178 * also used as a bit value for deferring the actual trigger 1179 * action until after the current event is finished. Some 1180 * commands need to do this if they themselves log to the trace 1181 * buffer (see the @post_trigger() member below). @trigger_type 1182 * values are defined by adding new values to the trigger_type 1183 * enum in include/linux/ftrace_event.h. 1184 * 1185 * @post_trigger: A flag that says whether or not this command needs 1186 * to have its action delayed until after the current event has 1187 * been closed. Some triggers need to avoid being invoked while 1188 * an event is currently in the process of being logged, since 1189 * the trigger may itself log data into the trace buffer. Thus 1190 * we make sure the current event is committed before invoking 1191 * those triggers. To do that, the trigger invocation is split 1192 * in two - the first part checks the filter using the current 1193 * trace record; if a command has the @post_trigger flag set, it 1194 * sets a bit for itself in the return value, otherwise it 1195 * directly invokes the trigger. Once all commands have been 1196 * either invoked or set their return flag, the current record is 1197 * either committed or discarded. At that point, if any commands 1198 * have deferred their triggers, those commands are finally 1199 * invoked following the close of the current event. In other 1200 * words, if the event_trigger_ops @func() probe implementation 1201 * itself logs to the trace buffer, this flag should be set, 1202 * otherwise it can be left unspecified. 1203 * 1204 * All the methods below, except for @set_filter(), must be 1205 * implemented. 1206 * 1207 * @func: The callback function responsible for parsing and 1208 * registering the trigger written to the 'trigger' file by the 1209 * user. It allocates the trigger instance and registers it with 1210 * the appropriate trace event. It makes use of the other 1211 * event_command callback functions to orchestrate this, and is 1212 * usually implemented by the generic utility function 1213 * @event_trigger_callback() (see trace_event_triggers.c). 1214 * 1215 * @reg: Adds the trigger to the list of triggers associated with the 1216 * event, and enables the event trigger itself, after 1217 * initializing it (via the event_trigger_ops @init() function). 1218 * This is also where commands can use the @trigger_type value to 1219 * make the decision as to whether or not multiple instances of 1220 * the trigger should be allowed. This is usually implemented by 1221 * the generic utility function @register_trigger() (see 1222 * trace_event_triggers.c). 1223 * 1224 * @unreg: Removes the trigger from the list of triggers associated 1225 * with the event, and disables the event trigger itself, after 1226 * initializing it (via the event_trigger_ops @free() function). 1227 * This is usually implemented by the generic utility function 1228 * @unregister_trigger() (see trace_event_triggers.c). 1229 * 1230 * @set_filter: An optional function called to parse and set a filter 1231 * for the trigger. If no @set_filter() method is set for the 1232 * event command, filters set by the user for the command will be 1233 * ignored. This is usually implemented by the generic utility 1234 * function @set_trigger_filter() (see trace_event_triggers.c). 1235 * 1236 * @get_trigger_ops: The callback function invoked to retrieve the 1237 * event_trigger_ops implementation associated with the command. 1238 */ 1239 struct event_command { 1240 struct list_head list; 1241 char *name; 1242 enum event_trigger_type trigger_type; 1243 bool post_trigger; 1244 int (*func)(struct event_command *cmd_ops, 1245 struct ftrace_event_file *file, 1246 char *glob, char *cmd, char *params); 1247 int (*reg)(char *glob, 1248 struct event_trigger_ops *ops, 1249 struct event_trigger_data *data, 1250 struct ftrace_event_file *file); 1251 void (*unreg)(char *glob, 1252 struct event_trigger_ops *ops, 1253 struct event_trigger_data *data, 1254 struct ftrace_event_file *file); 1255 int (*set_filter)(char *filter_str, 1256 struct event_trigger_data *data, 1257 struct ftrace_event_file *file); 1258 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1259 }; 1260 1261 extern int trace_event_enable_disable(struct ftrace_event_file *file, 1262 int enable, int soft_disable); 1263 extern int tracing_alloc_snapshot(void); 1264 1265 extern const char *__start___trace_bprintk_fmt[]; 1266 extern const char *__stop___trace_bprintk_fmt[]; 1267 1268 extern const char *__start___tracepoint_str[]; 1269 extern const char *__stop___tracepoint_str[]; 1270 1271 void trace_printk_init_buffers(void); 1272 void trace_printk_start_comm(void); 1273 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1274 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1275 1276 /* 1277 * Normal trace_printk() and friends allocates special buffers 1278 * to do the manipulation, as well as saves the print formats 1279 * into sections to display. But the trace infrastructure wants 1280 * to use these without the added overhead at the price of being 1281 * a bit slower (used mainly for warnings, where we don't care 1282 * about performance). The internal_trace_puts() is for such 1283 * a purpose. 1284 */ 1285 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1286 1287 #undef FTRACE_ENTRY 1288 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1289 extern struct ftrace_event_call \ 1290 __aligned(4) event_##call; 1291 #undef FTRACE_ENTRY_DUP 1292 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1293 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1294 filter) 1295 #include "trace_entries.h" 1296 1297 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1298 int perf_ftrace_event_register(struct ftrace_event_call *call, 1299 enum trace_reg type, void *data); 1300 #else 1301 #define perf_ftrace_event_register NULL 1302 #endif 1303 1304 #ifdef CONFIG_FTRACE_SYSCALLS 1305 void init_ftrace_syscalls(void); 1306 #else 1307 static inline void init_ftrace_syscalls(void) { } 1308 #endif 1309 1310 #ifdef CONFIG_EVENT_TRACING 1311 void trace_event_init(void); 1312 #else 1313 static inline void __init trace_event_init(void) { } 1314 #endif 1315 1316 extern struct trace_iterator *tracepoint_print_iter; 1317 1318 #endif /* _LINUX_KERNEL_TRACE_H */ 1319