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_on) 367 * @stop: called when tracing is paused (echo 0 > tracing_on) 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_BRANCH_BIT, 471 /* 472 * Abuse of the trace_recursion. 473 * As we need a way to maintain state if we are tracing the function 474 * graph in irq because we want to trace a particular function that 475 * was called in irq context but we have irq tracing off. Since this 476 * can only be modified by current, we can reuse trace_recursion. 477 */ 478 TRACE_IRQ_BIT, 479 }; 480 481 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 482 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 483 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 484 485 #define TRACE_CONTEXT_BITS 4 486 487 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 488 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 489 490 #define TRACE_LIST_START TRACE_INTERNAL_BIT 491 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 492 493 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 494 495 static __always_inline int trace_get_context_bit(void) 496 { 497 int bit; 498 499 if (in_interrupt()) { 500 if (in_nmi()) 501 bit = 0; 502 503 else if (in_irq()) 504 bit = 1; 505 else 506 bit = 2; 507 } else 508 bit = 3; 509 510 return bit; 511 } 512 513 static __always_inline int trace_test_and_set_recursion(int start, int max) 514 { 515 unsigned int val = current->trace_recursion; 516 int bit; 517 518 /* A previous recursion check was made */ 519 if ((val & TRACE_CONTEXT_MASK) > max) 520 return 0; 521 522 bit = trace_get_context_bit() + start; 523 if (unlikely(val & (1 << bit))) 524 return -1; 525 526 val |= 1 << bit; 527 current->trace_recursion = val; 528 barrier(); 529 530 return bit; 531 } 532 533 static __always_inline void trace_clear_recursion(int bit) 534 { 535 unsigned int val = current->trace_recursion; 536 537 if (!bit) 538 return; 539 540 bit = 1 << bit; 541 val &= ~bit; 542 543 barrier(); 544 current->trace_recursion = val; 545 } 546 547 static inline struct ring_buffer_iter * 548 trace_buffer_iter(struct trace_iterator *iter, int cpu) 549 { 550 if (iter->buffer_iter && iter->buffer_iter[cpu]) 551 return iter->buffer_iter[cpu]; 552 return NULL; 553 } 554 555 int tracer_init(struct tracer *t, struct trace_array *tr); 556 int tracing_is_enabled(void); 557 void tracing_reset(struct trace_buffer *buf, int cpu); 558 void tracing_reset_online_cpus(struct trace_buffer *buf); 559 void tracing_reset_current(int cpu); 560 void tracing_reset_all_online_cpus(void); 561 int tracing_open_generic(struct inode *inode, struct file *filp); 562 bool tracing_is_disabled(void); 563 struct dentry *trace_create_file(const char *name, 564 umode_t mode, 565 struct dentry *parent, 566 void *data, 567 const struct file_operations *fops); 568 569 struct dentry *tracing_init_dentry(void); 570 571 struct ring_buffer_event; 572 573 struct ring_buffer_event * 574 trace_buffer_lock_reserve(struct ring_buffer *buffer, 575 int type, 576 unsigned long len, 577 unsigned long flags, 578 int pc); 579 580 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 581 struct trace_array_cpu *data); 582 583 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 584 int *ent_cpu, u64 *ent_ts); 585 586 void __buffer_unlock_commit(struct ring_buffer *buffer, 587 struct ring_buffer_event *event); 588 589 int trace_empty(struct trace_iterator *iter); 590 591 void *trace_find_next_entry_inc(struct trace_iterator *iter); 592 593 void trace_init_global_iter(struct trace_iterator *iter); 594 595 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 596 597 void trace_function(struct trace_array *tr, 598 unsigned long ip, 599 unsigned long parent_ip, 600 unsigned long flags, int pc); 601 void trace_graph_function(struct trace_array *tr, 602 unsigned long ip, 603 unsigned long parent_ip, 604 unsigned long flags, int pc); 605 void trace_latency_header(struct seq_file *m); 606 void trace_default_header(struct seq_file *m); 607 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 608 int trace_empty(struct trace_iterator *iter); 609 610 void trace_graph_return(struct ftrace_graph_ret *trace); 611 int trace_graph_entry(struct ftrace_graph_ent *trace); 612 void set_graph_array(struct trace_array *tr); 613 614 void tracing_start_cmdline_record(void); 615 void tracing_stop_cmdline_record(void); 616 int register_tracer(struct tracer *type); 617 int is_tracing_stopped(void); 618 619 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 620 621 extern cpumask_var_t __read_mostly tracing_buffer_mask; 622 623 #define for_each_tracing_cpu(cpu) \ 624 for_each_cpu(cpu, tracing_buffer_mask) 625 626 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 627 628 extern unsigned long tracing_thresh; 629 630 #ifdef CONFIG_TRACER_MAX_TRACE 631 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 632 void update_max_tr_single(struct trace_array *tr, 633 struct task_struct *tsk, int cpu); 634 #endif /* CONFIG_TRACER_MAX_TRACE */ 635 636 #ifdef CONFIG_STACKTRACE 637 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 638 int pc); 639 640 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 641 int pc); 642 #else 643 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 644 unsigned long flags, int pc) 645 { 646 } 647 648 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 649 int skip, int pc) 650 { 651 } 652 #endif /* CONFIG_STACKTRACE */ 653 654 extern cycle_t ftrace_now(int cpu); 655 656 extern void trace_find_cmdline(int pid, char comm[]); 657 658 #ifdef CONFIG_DYNAMIC_FTRACE 659 extern unsigned long ftrace_update_tot_cnt; 660 #endif 661 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 662 extern int DYN_FTRACE_TEST_NAME(void); 663 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 664 extern int DYN_FTRACE_TEST_NAME2(void); 665 666 extern bool ring_buffer_expanded; 667 extern bool tracing_selftest_disabled; 668 669 #ifdef CONFIG_FTRACE_STARTUP_TEST 670 extern int trace_selftest_startup_function(struct tracer *trace, 671 struct trace_array *tr); 672 extern int trace_selftest_startup_function_graph(struct tracer *trace, 673 struct trace_array *tr); 674 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 675 struct trace_array *tr); 676 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 677 struct trace_array *tr); 678 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 679 struct trace_array *tr); 680 extern int trace_selftest_startup_wakeup(struct tracer *trace, 681 struct trace_array *tr); 682 extern int trace_selftest_startup_nop(struct tracer *trace, 683 struct trace_array *tr); 684 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 685 struct trace_array *tr); 686 extern int trace_selftest_startup_branch(struct tracer *trace, 687 struct trace_array *tr); 688 /* 689 * Tracer data references selftest functions that only occur 690 * on boot up. These can be __init functions. Thus, when selftests 691 * are enabled, then the tracers need to reference __init functions. 692 */ 693 #define __tracer_data __refdata 694 #else 695 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 696 #define __tracer_data __read_mostly 697 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 698 699 extern void *head_page(struct trace_array_cpu *data); 700 extern unsigned long long ns2usecs(cycle_t nsec); 701 extern int 702 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 703 extern int 704 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 705 extern int 706 trace_array_vprintk(struct trace_array *tr, 707 unsigned long ip, const char *fmt, va_list args); 708 int trace_array_printk(struct trace_array *tr, 709 unsigned long ip, const char *fmt, ...); 710 int trace_array_printk_buf(struct ring_buffer *buffer, 711 unsigned long ip, const char *fmt, ...); 712 void trace_printk_seq(struct trace_seq *s); 713 enum print_line_t print_trace_line(struct trace_iterator *iter); 714 715 extern char trace_find_mark(unsigned long long duration); 716 717 /* Standard output formatting function used for function return traces */ 718 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 719 720 /* Flag options */ 721 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 722 #define TRACE_GRAPH_PRINT_CPU 0x2 723 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 724 #define TRACE_GRAPH_PRINT_PROC 0x8 725 #define TRACE_GRAPH_PRINT_DURATION 0x10 726 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 727 #define TRACE_GRAPH_PRINT_IRQS 0x40 728 #define TRACE_GRAPH_PRINT_TAIL 0x80 729 #define TRACE_GRAPH_SLEEP_TIME 0x100 730 #define TRACE_GRAPH_GRAPH_TIME 0x200 731 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 732 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 733 734 extern void ftrace_graph_sleep_time_control(bool enable); 735 extern void ftrace_graph_graph_time_control(bool enable); 736 737 extern enum print_line_t 738 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 739 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 740 extern void 741 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 742 extern void graph_trace_open(struct trace_iterator *iter); 743 extern void graph_trace_close(struct trace_iterator *iter); 744 extern int __trace_graph_entry(struct trace_array *tr, 745 struct ftrace_graph_ent *trace, 746 unsigned long flags, int pc); 747 extern void __trace_graph_return(struct trace_array *tr, 748 struct ftrace_graph_ret *trace, 749 unsigned long flags, int pc); 750 751 752 #ifdef CONFIG_DYNAMIC_FTRACE 753 /* TODO: make this variable */ 754 #define FTRACE_GRAPH_MAX_FUNCS 32 755 extern int ftrace_graph_count; 756 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 757 extern int ftrace_graph_notrace_count; 758 extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; 759 760 static inline int ftrace_graph_addr(unsigned long addr) 761 { 762 int i; 763 764 if (!ftrace_graph_count) 765 return 1; 766 767 for (i = 0; i < ftrace_graph_count; i++) { 768 if (addr == ftrace_graph_funcs[i]) { 769 /* 770 * If no irqs are to be traced, but a set_graph_function 771 * is set, and called by an interrupt handler, we still 772 * want to trace it. 773 */ 774 if (in_irq()) 775 trace_recursion_set(TRACE_IRQ_BIT); 776 else 777 trace_recursion_clear(TRACE_IRQ_BIT); 778 return 1; 779 } 780 } 781 782 return 0; 783 } 784 785 static inline int ftrace_graph_notrace_addr(unsigned long addr) 786 { 787 int i; 788 789 if (!ftrace_graph_notrace_count) 790 return 0; 791 792 for (i = 0; i < ftrace_graph_notrace_count; i++) { 793 if (addr == ftrace_graph_notrace_funcs[i]) 794 return 1; 795 } 796 797 return 0; 798 } 799 #else 800 static inline int ftrace_graph_addr(unsigned long addr) 801 { 802 return 1; 803 } 804 805 static inline int ftrace_graph_notrace_addr(unsigned long addr) 806 { 807 return 0; 808 } 809 #endif /* CONFIG_DYNAMIC_FTRACE */ 810 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 811 static inline enum print_line_t 812 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 813 { 814 return TRACE_TYPE_UNHANDLED; 815 } 816 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 817 818 extern struct list_head ftrace_pids; 819 820 #ifdef CONFIG_FUNCTION_TRACER 821 extern bool ftrace_filter_param __initdata; 822 static inline int ftrace_trace_task(struct task_struct *task) 823 { 824 if (list_empty(&ftrace_pids)) 825 return 1; 826 827 return test_tsk_trace_trace(task); 828 } 829 extern int ftrace_is_dead(void); 830 int ftrace_create_function_files(struct trace_array *tr, 831 struct dentry *parent); 832 void ftrace_destroy_function_files(struct trace_array *tr); 833 void ftrace_init_global_array_ops(struct trace_array *tr); 834 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 835 void ftrace_reset_array_ops(struct trace_array *tr); 836 int using_ftrace_ops_list_func(void); 837 #else 838 static inline int ftrace_trace_task(struct task_struct *task) 839 { 840 return 1; 841 } 842 static inline int ftrace_is_dead(void) { return 0; } 843 static inline int 844 ftrace_create_function_files(struct trace_array *tr, 845 struct dentry *parent) 846 { 847 return 0; 848 } 849 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 850 static inline __init void 851 ftrace_init_global_array_ops(struct trace_array *tr) { } 852 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 853 /* ftace_func_t type is not defined, use macro instead of static inline */ 854 #define ftrace_init_array_ops(tr, func) do { } while (0) 855 #endif /* CONFIG_FUNCTION_TRACER */ 856 857 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 858 void ftrace_create_filter_files(struct ftrace_ops *ops, 859 struct dentry *parent); 860 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 861 #else 862 /* 863 * The ops parameter passed in is usually undefined. 864 * This must be a macro. 865 */ 866 #define ftrace_create_filter_files(ops, parent) do { } while (0) 867 #define ftrace_destroy_filter_files(ops) do { } while (0) 868 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 869 870 bool ftrace_event_is_function(struct trace_event_call *call); 871 872 /* 873 * struct trace_parser - servers for reading the user input separated by spaces 874 * @cont: set if the input is not complete - no final space char was found 875 * @buffer: holds the parsed user input 876 * @idx: user input length 877 * @size: buffer size 878 */ 879 struct trace_parser { 880 bool cont; 881 char *buffer; 882 unsigned idx; 883 unsigned size; 884 }; 885 886 static inline bool trace_parser_loaded(struct trace_parser *parser) 887 { 888 return (parser->idx != 0); 889 } 890 891 static inline bool trace_parser_cont(struct trace_parser *parser) 892 { 893 return parser->cont; 894 } 895 896 static inline void trace_parser_clear(struct trace_parser *parser) 897 { 898 parser->cont = false; 899 parser->idx = 0; 900 } 901 902 extern int trace_parser_get_init(struct trace_parser *parser, int size); 903 extern void trace_parser_put(struct trace_parser *parser); 904 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 905 size_t cnt, loff_t *ppos); 906 907 /* 908 * Only create function graph options if function graph is configured. 909 */ 910 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 911 # define FGRAPH_FLAGS \ 912 C(DISPLAY_GRAPH, "display-graph"), 913 #else 914 # define FGRAPH_FLAGS 915 #endif 916 917 #ifdef CONFIG_BRANCH_TRACER 918 # define BRANCH_FLAGS \ 919 C(BRANCH, "branch"), 920 #else 921 # define BRANCH_FLAGS 922 #endif 923 924 #ifdef CONFIG_FUNCTION_TRACER 925 # define FUNCTION_FLAGS \ 926 C(FUNCTION, "function-trace"), 927 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 928 #else 929 # define FUNCTION_FLAGS 930 # define FUNCTION_DEFAULT_FLAGS 0UL 931 #endif 932 933 #ifdef CONFIG_STACKTRACE 934 # define STACK_FLAGS \ 935 C(STACKTRACE, "stacktrace"), 936 #else 937 # define STACK_FLAGS 938 #endif 939 940 /* 941 * trace_iterator_flags is an enumeration that defines bit 942 * positions into trace_flags that controls the output. 943 * 944 * NOTE: These bits must match the trace_options array in 945 * trace.c (this macro guarantees it). 946 */ 947 #define TRACE_FLAGS \ 948 C(PRINT_PARENT, "print-parent"), \ 949 C(SYM_OFFSET, "sym-offset"), \ 950 C(SYM_ADDR, "sym-addr"), \ 951 C(VERBOSE, "verbose"), \ 952 C(RAW, "raw"), \ 953 C(HEX, "hex"), \ 954 C(BIN, "bin"), \ 955 C(BLOCK, "block"), \ 956 C(PRINTK, "trace_printk"), \ 957 C(ANNOTATE, "annotate"), \ 958 C(USERSTACKTRACE, "userstacktrace"), \ 959 C(SYM_USEROBJ, "sym-userobj"), \ 960 C(PRINTK_MSGONLY, "printk-msg-only"), \ 961 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 962 C(LATENCY_FMT, "latency-format"), \ 963 C(RECORD_CMD, "record-cmd"), \ 964 C(OVERWRITE, "overwrite"), \ 965 C(STOP_ON_FREE, "disable_on_free"), \ 966 C(IRQ_INFO, "irq-info"), \ 967 C(MARKERS, "markers"), \ 968 FUNCTION_FLAGS \ 969 FGRAPH_FLAGS \ 970 STACK_FLAGS \ 971 BRANCH_FLAGS 972 973 /* 974 * By defining C, we can make TRACE_FLAGS a list of bit names 975 * that will define the bits for the flag masks. 976 */ 977 #undef C 978 #define C(a, b) TRACE_ITER_##a##_BIT 979 980 enum trace_iterator_bits { 981 TRACE_FLAGS 982 /* Make sure we don't go more than we have bits for */ 983 TRACE_ITER_LAST_BIT 984 }; 985 986 /* 987 * By redefining C, we can make TRACE_FLAGS a list of masks that 988 * use the bits as defined above. 989 */ 990 #undef C 991 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 992 993 enum trace_iterator_flags { TRACE_FLAGS }; 994 995 /* 996 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 997 * control the output of kernel symbols. 998 */ 999 #define TRACE_ITER_SYM_MASK \ 1000 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1001 1002 extern struct tracer nop_trace; 1003 1004 #ifdef CONFIG_BRANCH_TRACER 1005 extern int enable_branch_tracing(struct trace_array *tr); 1006 extern void disable_branch_tracing(void); 1007 static inline int trace_branch_enable(struct trace_array *tr) 1008 { 1009 if (tr->trace_flags & TRACE_ITER_BRANCH) 1010 return enable_branch_tracing(tr); 1011 return 0; 1012 } 1013 static inline void trace_branch_disable(void) 1014 { 1015 /* due to races, always disable */ 1016 disable_branch_tracing(); 1017 } 1018 #else 1019 static inline int trace_branch_enable(struct trace_array *tr) 1020 { 1021 return 0; 1022 } 1023 static inline void trace_branch_disable(void) 1024 { 1025 } 1026 #endif /* CONFIG_BRANCH_TRACER */ 1027 1028 /* set ring buffers to default size if not already done so */ 1029 int tracing_update_buffers(void); 1030 1031 struct ftrace_event_field { 1032 struct list_head link; 1033 const char *name; 1034 const char *type; 1035 int filter_type; 1036 int offset; 1037 int size; 1038 int is_signed; 1039 }; 1040 1041 struct event_filter { 1042 int n_preds; /* Number assigned */ 1043 int a_preds; /* allocated */ 1044 struct filter_pred *preds; 1045 struct filter_pred *root; 1046 char *filter_string; 1047 }; 1048 1049 struct event_subsystem { 1050 struct list_head list; 1051 const char *name; 1052 struct event_filter *filter; 1053 int ref_count; 1054 }; 1055 1056 struct trace_subsystem_dir { 1057 struct list_head list; 1058 struct event_subsystem *subsystem; 1059 struct trace_array *tr; 1060 struct dentry *entry; 1061 int ref_count; 1062 int nr_events; 1063 }; 1064 1065 #define FILTER_PRED_INVALID ((unsigned short)-1) 1066 #define FILTER_PRED_IS_RIGHT (1 << 15) 1067 #define FILTER_PRED_FOLD (1 << 15) 1068 1069 /* 1070 * The max preds is the size of unsigned short with 1071 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1072 * and FOLD flags. The other is reserved. 1073 * 1074 * 2^14 preds is way more than enough. 1075 */ 1076 #define MAX_FILTER_PRED 16384 1077 1078 struct filter_pred; 1079 struct regex; 1080 1081 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1082 1083 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1084 1085 enum regex_type { 1086 MATCH_FULL = 0, 1087 MATCH_FRONT_ONLY, 1088 MATCH_MIDDLE_ONLY, 1089 MATCH_END_ONLY, 1090 }; 1091 1092 struct regex { 1093 char pattern[MAX_FILTER_STR_VAL]; 1094 int len; 1095 int field_len; 1096 regex_match_func match; 1097 }; 1098 1099 struct filter_pred { 1100 filter_pred_fn_t fn; 1101 u64 val; 1102 struct regex regex; 1103 unsigned short *ops; 1104 struct ftrace_event_field *field; 1105 int offset; 1106 int not; 1107 int op; 1108 unsigned short index; 1109 unsigned short parent; 1110 unsigned short left; 1111 unsigned short right; 1112 }; 1113 1114 extern enum regex_type 1115 filter_parse_regex(char *buff, int len, char **search, int *not); 1116 extern void print_event_filter(struct trace_event_file *file, 1117 struct trace_seq *s); 1118 extern int apply_event_filter(struct trace_event_file *file, 1119 char *filter_string); 1120 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1121 char *filter_string); 1122 extern void print_subsystem_event_filter(struct event_subsystem *system, 1123 struct trace_seq *s); 1124 extern int filter_assign_type(const char *type); 1125 extern int create_event_filter(struct trace_event_call *call, 1126 char *filter_str, bool set_str, 1127 struct event_filter **filterp); 1128 extern void free_event_filter(struct event_filter *filter); 1129 1130 struct ftrace_event_field * 1131 trace_find_event_field(struct trace_event_call *call, char *name); 1132 1133 extern void trace_event_enable_cmd_record(bool enable); 1134 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1135 extern int event_trace_del_tracer(struct trace_array *tr); 1136 1137 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1138 const char *system, 1139 const char *event); 1140 1141 static inline void *event_file_data(struct file *filp) 1142 { 1143 return ACCESS_ONCE(file_inode(filp)->i_private); 1144 } 1145 1146 extern struct mutex event_mutex; 1147 extern struct list_head ftrace_events; 1148 1149 extern const struct file_operations event_trigger_fops; 1150 1151 extern int register_trigger_cmds(void); 1152 extern void clear_event_triggers(struct trace_array *tr); 1153 1154 struct event_trigger_data { 1155 unsigned long count; 1156 int ref; 1157 struct event_trigger_ops *ops; 1158 struct event_command *cmd_ops; 1159 struct event_filter __rcu *filter; 1160 char *filter_str; 1161 void *private_data; 1162 struct list_head list; 1163 }; 1164 1165 /** 1166 * struct event_trigger_ops - callbacks for trace event triggers 1167 * 1168 * The methods in this structure provide per-event trigger hooks for 1169 * various trigger operations. 1170 * 1171 * All the methods below, except for @init() and @free(), must be 1172 * implemented. 1173 * 1174 * @func: The trigger 'probe' function called when the triggering 1175 * event occurs. The data passed into this callback is the data 1176 * that was supplied to the event_command @reg() function that 1177 * registered the trigger (see struct event_command). 1178 * 1179 * @init: An optional initialization function called for the trigger 1180 * when the trigger is registered (via the event_command reg() 1181 * function). This can be used to perform per-trigger 1182 * initialization such as incrementing a per-trigger reference 1183 * count, for instance. This is usually implemented by the 1184 * generic utility function @event_trigger_init() (see 1185 * trace_event_triggers.c). 1186 * 1187 * @free: An optional de-initialization function called for the 1188 * trigger when the trigger is unregistered (via the 1189 * event_command @reg() function). This can be used to perform 1190 * per-trigger de-initialization such as decrementing a 1191 * per-trigger reference count and freeing corresponding trigger 1192 * data, for instance. This is usually implemented by the 1193 * generic utility function @event_trigger_free() (see 1194 * trace_event_triggers.c). 1195 * 1196 * @print: The callback function invoked to have the trigger print 1197 * itself. This is usually implemented by a wrapper function 1198 * that calls the generic utility function @event_trigger_print() 1199 * (see trace_event_triggers.c). 1200 */ 1201 struct event_trigger_ops { 1202 void (*func)(struct event_trigger_data *data); 1203 int (*init)(struct event_trigger_ops *ops, 1204 struct event_trigger_data *data); 1205 void (*free)(struct event_trigger_ops *ops, 1206 struct event_trigger_data *data); 1207 int (*print)(struct seq_file *m, 1208 struct event_trigger_ops *ops, 1209 struct event_trigger_data *data); 1210 }; 1211 1212 /** 1213 * struct event_command - callbacks and data members for event commands 1214 * 1215 * Event commands are invoked by users by writing the command name 1216 * into the 'trigger' file associated with a trace event. The 1217 * parameters associated with a specific invocation of an event 1218 * command are used to create an event trigger instance, which is 1219 * added to the list of trigger instances associated with that trace 1220 * event. When the event is hit, the set of triggers associated with 1221 * that event is invoked. 1222 * 1223 * The data members in this structure provide per-event command data 1224 * for various event commands. 1225 * 1226 * All the data members below, except for @post_trigger, must be set 1227 * for each event command. 1228 * 1229 * @name: The unique name that identifies the event command. This is 1230 * the name used when setting triggers via trigger files. 1231 * 1232 * @trigger_type: A unique id that identifies the event command 1233 * 'type'. This value has two purposes, the first to ensure that 1234 * only one trigger of the same type can be set at a given time 1235 * for a particular event e.g. it doesn't make sense to have both 1236 * a traceon and traceoff trigger attached to a single event at 1237 * the same time, so traceon and traceoff have the same type 1238 * though they have different names. The @trigger_type value is 1239 * also used as a bit value for deferring the actual trigger 1240 * action until after the current event is finished. Some 1241 * commands need to do this if they themselves log to the trace 1242 * buffer (see the @post_trigger() member below). @trigger_type 1243 * values are defined by adding new values to the trigger_type 1244 * enum in include/linux/trace_events.h. 1245 * 1246 * @post_trigger: A flag that says whether or not this command needs 1247 * to have its action delayed until after the current event has 1248 * been closed. Some triggers need to avoid being invoked while 1249 * an event is currently in the process of being logged, since 1250 * the trigger may itself log data into the trace buffer. Thus 1251 * we make sure the current event is committed before invoking 1252 * those triggers. To do that, the trigger invocation is split 1253 * in two - the first part checks the filter using the current 1254 * trace record; if a command has the @post_trigger flag set, it 1255 * sets a bit for itself in the return value, otherwise it 1256 * directly invokes the trigger. Once all commands have been 1257 * either invoked or set their return flag, the current record is 1258 * either committed or discarded. At that point, if any commands 1259 * have deferred their triggers, those commands are finally 1260 * invoked following the close of the current event. In other 1261 * words, if the event_trigger_ops @func() probe implementation 1262 * itself logs to the trace buffer, this flag should be set, 1263 * otherwise it can be left unspecified. 1264 * 1265 * All the methods below, except for @set_filter(), must be 1266 * implemented. 1267 * 1268 * @func: The callback function responsible for parsing and 1269 * registering the trigger written to the 'trigger' file by the 1270 * user. It allocates the trigger instance and registers it with 1271 * the appropriate trace event. It makes use of the other 1272 * event_command callback functions to orchestrate this, and is 1273 * usually implemented by the generic utility function 1274 * @event_trigger_callback() (see trace_event_triggers.c). 1275 * 1276 * @reg: Adds the trigger to the list of triggers associated with the 1277 * event, and enables the event trigger itself, after 1278 * initializing it (via the event_trigger_ops @init() function). 1279 * This is also where commands can use the @trigger_type value to 1280 * make the decision as to whether or not multiple instances of 1281 * the trigger should be allowed. This is usually implemented by 1282 * the generic utility function @register_trigger() (see 1283 * trace_event_triggers.c). 1284 * 1285 * @unreg: Removes the trigger from the list of triggers associated 1286 * with the event, and disables the event trigger itself, after 1287 * initializing it (via the event_trigger_ops @free() function). 1288 * This is usually implemented by the generic utility function 1289 * @unregister_trigger() (see trace_event_triggers.c). 1290 * 1291 * @set_filter: An optional function called to parse and set a filter 1292 * for the trigger. If no @set_filter() method is set for the 1293 * event command, filters set by the user for the command will be 1294 * ignored. This is usually implemented by the generic utility 1295 * function @set_trigger_filter() (see trace_event_triggers.c). 1296 * 1297 * @get_trigger_ops: The callback function invoked to retrieve the 1298 * event_trigger_ops implementation associated with the command. 1299 */ 1300 struct event_command { 1301 struct list_head list; 1302 char *name; 1303 enum event_trigger_type trigger_type; 1304 bool post_trigger; 1305 int (*func)(struct event_command *cmd_ops, 1306 struct trace_event_file *file, 1307 char *glob, char *cmd, char *params); 1308 int (*reg)(char *glob, 1309 struct event_trigger_ops *ops, 1310 struct event_trigger_data *data, 1311 struct trace_event_file *file); 1312 void (*unreg)(char *glob, 1313 struct event_trigger_ops *ops, 1314 struct event_trigger_data *data, 1315 struct trace_event_file *file); 1316 int (*set_filter)(char *filter_str, 1317 struct event_trigger_data *data, 1318 struct trace_event_file *file); 1319 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1320 }; 1321 1322 extern int trace_event_enable_disable(struct trace_event_file *file, 1323 int enable, int soft_disable); 1324 extern int tracing_alloc_snapshot(void); 1325 1326 extern const char *__start___trace_bprintk_fmt[]; 1327 extern const char *__stop___trace_bprintk_fmt[]; 1328 1329 extern const char *__start___tracepoint_str[]; 1330 extern const char *__stop___tracepoint_str[]; 1331 1332 void trace_printk_control(bool enabled); 1333 void trace_printk_init_buffers(void); 1334 void trace_printk_start_comm(void); 1335 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1336 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1337 1338 /* 1339 * Normal trace_printk() and friends allocates special buffers 1340 * to do the manipulation, as well as saves the print formats 1341 * into sections to display. But the trace infrastructure wants 1342 * to use these without the added overhead at the price of being 1343 * a bit slower (used mainly for warnings, where we don't care 1344 * about performance). The internal_trace_puts() is for such 1345 * a purpose. 1346 */ 1347 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1348 1349 #undef FTRACE_ENTRY 1350 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1351 extern struct trace_event_call \ 1352 __aligned(4) event_##call; 1353 #undef FTRACE_ENTRY_DUP 1354 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1355 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1356 filter) 1357 #include "trace_entries.h" 1358 1359 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1360 int perf_ftrace_event_register(struct trace_event_call *call, 1361 enum trace_reg type, void *data); 1362 #else 1363 #define perf_ftrace_event_register NULL 1364 #endif 1365 1366 #ifdef CONFIG_FTRACE_SYSCALLS 1367 void init_ftrace_syscalls(void); 1368 #else 1369 static inline void init_ftrace_syscalls(void) { } 1370 #endif 1371 1372 #ifdef CONFIG_EVENT_TRACING 1373 void trace_event_init(void); 1374 void trace_event_enum_update(struct trace_enum_map **map, int len); 1375 #else 1376 static inline void __init trace_event_init(void) { } 1377 static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { } 1378 #endif 1379 1380 extern struct trace_iterator *tracepoint_print_iter; 1381 1382 #endif /* _LINUX_KERNEL_TRACE_H */ 1383