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 18 #ifdef CONFIG_FTRACE_SYSCALLS 19 #include <asm/unistd.h> /* For NR_SYSCALLS */ 20 #include <asm/syscall.h> /* some archs define it here */ 21 #endif 22 23 enum trace_type { 24 __TRACE_FIRST_TYPE = 0, 25 26 TRACE_FN, 27 TRACE_CTX, 28 TRACE_WAKE, 29 TRACE_STACK, 30 TRACE_PRINT, 31 TRACE_BPRINT, 32 TRACE_MMIO_RW, 33 TRACE_MMIO_MAP, 34 TRACE_BRANCH, 35 TRACE_GRAPH_RET, 36 TRACE_GRAPH_ENT, 37 TRACE_USER_STACK, 38 TRACE_BLK, 39 TRACE_BPUTS, 40 41 __TRACE_LAST_TYPE, 42 }; 43 44 45 #undef __field 46 #define __field(type, item) type item; 47 48 #undef __field_struct 49 #define __field_struct(type, item) __field(type, item) 50 51 #undef __field_desc 52 #define __field_desc(type, container, item) 53 54 #undef __array 55 #define __array(type, item, size) type item[size]; 56 57 #undef __array_desc 58 #define __array_desc(type, container, item, size) 59 60 #undef __dynamic_array 61 #define __dynamic_array(type, item) type item[]; 62 63 #undef F_STRUCT 64 #define F_STRUCT(args...) args 65 66 #undef FTRACE_ENTRY 67 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 68 struct struct_name { \ 69 struct trace_entry ent; \ 70 tstruct \ 71 } 72 73 #undef TP_ARGS 74 #define TP_ARGS(args...) args 75 76 #undef FTRACE_ENTRY_DUP 77 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) 78 79 #undef FTRACE_ENTRY_REG 80 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 81 filter, regfn) \ 82 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 83 filter) 84 85 #include "trace_entries.h" 86 87 /* 88 * syscalls are special, and need special handling, this is why 89 * they are not included in trace_entries.h 90 */ 91 struct syscall_trace_enter { 92 struct trace_entry ent; 93 int nr; 94 unsigned long args[]; 95 }; 96 97 struct syscall_trace_exit { 98 struct trace_entry ent; 99 int nr; 100 long ret; 101 }; 102 103 struct kprobe_trace_entry_head { 104 struct trace_entry ent; 105 unsigned long ip; 106 }; 107 108 struct kretprobe_trace_entry_head { 109 struct trace_entry ent; 110 unsigned long func; 111 unsigned long ret_ip; 112 }; 113 114 /* 115 * trace_flag_type is an enumeration that holds different 116 * states when a trace occurs. These are: 117 * IRQS_OFF - interrupts were disabled 118 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 119 * NEED_RESCHED - reschedule is requested 120 * HARDIRQ - inside an interrupt handler 121 * SOFTIRQ - inside a softirq handler 122 */ 123 enum trace_flag_type { 124 TRACE_FLAG_IRQS_OFF = 0x01, 125 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 126 TRACE_FLAG_NEED_RESCHED = 0x04, 127 TRACE_FLAG_HARDIRQ = 0x08, 128 TRACE_FLAG_SOFTIRQ = 0x10, 129 TRACE_FLAG_PREEMPT_RESCHED = 0x20, 130 }; 131 132 #define TRACE_BUF_SIZE 1024 133 134 struct trace_array; 135 136 /* 137 * The CPU trace array - it consists of thousands of trace entries 138 * plus some other descriptor data: (for example which task started 139 * the trace, etc.) 140 */ 141 struct trace_array_cpu { 142 atomic_t disabled; 143 void *buffer_page; /* ring buffer spare */ 144 145 unsigned long entries; 146 unsigned long saved_latency; 147 unsigned long critical_start; 148 unsigned long critical_end; 149 unsigned long critical_sequence; 150 unsigned long nice; 151 unsigned long policy; 152 unsigned long rt_priority; 153 unsigned long skipped_entries; 154 cycle_t preempt_timestamp; 155 pid_t pid; 156 kuid_t uid; 157 char comm[TASK_COMM_LEN]; 158 }; 159 160 struct tracer; 161 162 struct trace_buffer { 163 struct trace_array *tr; 164 struct ring_buffer *buffer; 165 struct trace_array_cpu __percpu *data; 166 cycle_t time_start; 167 int cpu; 168 }; 169 170 /* 171 * The trace array - an array of per-CPU trace arrays. This is the 172 * highest level data structure that individual tracers deal with. 173 * They have on/off state as well: 174 */ 175 struct trace_array { 176 struct list_head list; 177 char *name; 178 struct trace_buffer trace_buffer; 179 #ifdef CONFIG_TRACER_MAX_TRACE 180 /* 181 * The max_buffer is used to snapshot the trace when a maximum 182 * latency is reached, or when the user initiates a snapshot. 183 * Some tracers will use this to store a maximum trace while 184 * it continues examining live traces. 185 * 186 * The buffers for the max_buffer are set up the same as the trace_buffer 187 * When a snapshot is taken, the buffer of the max_buffer is swapped 188 * with the buffer of the trace_buffer and the buffers are reset for 189 * the trace_buffer so the tracing can continue. 190 */ 191 struct trace_buffer max_buffer; 192 bool allocated_snapshot; 193 unsigned long max_latency; 194 #endif 195 /* 196 * max_lock is used to protect the swapping of buffers 197 * when taking a max snapshot. The buffers themselves are 198 * protected by per_cpu spinlocks. But the action of the swap 199 * needs its own lock. 200 * 201 * This is defined as a arch_spinlock_t in order to help 202 * with performance when lockdep debugging is enabled. 203 * 204 * It is also used in other places outside the update_max_tr 205 * so it needs to be defined outside of the 206 * CONFIG_TRACER_MAX_TRACE. 207 */ 208 arch_spinlock_t max_lock; 209 int buffer_disabled; 210 #ifdef CONFIG_FTRACE_SYSCALLS 211 int sys_refcount_enter; 212 int sys_refcount_exit; 213 struct ftrace_event_file __rcu *enter_syscall_files[NR_syscalls]; 214 struct ftrace_event_file __rcu *exit_syscall_files[NR_syscalls]; 215 #endif 216 int stop_count; 217 int clock_id; 218 struct tracer *current_trace; 219 unsigned int flags; 220 raw_spinlock_t start_lock; 221 struct dentry *dir; 222 struct dentry *options; 223 struct dentry *percpu_dir; 224 struct dentry *event_dir; 225 struct list_head systems; 226 struct list_head events; 227 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 228 int ref; 229 #ifdef CONFIG_FUNCTION_TRACER 230 struct ftrace_ops *ops; 231 /* function tracing enabled */ 232 int function_enabled; 233 #endif 234 }; 235 236 enum { 237 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 238 }; 239 240 extern struct list_head ftrace_trace_arrays; 241 242 extern struct mutex trace_types_lock; 243 244 extern int trace_array_get(struct trace_array *tr); 245 extern void trace_array_put(struct trace_array *tr); 246 247 /* 248 * The global tracer (top) should be the first trace array added, 249 * but we check the flag anyway. 250 */ 251 static inline struct trace_array *top_trace_array(void) 252 { 253 struct trace_array *tr; 254 255 if (list_empty(&ftrace_trace_arrays)) 256 return NULL; 257 258 tr = list_entry(ftrace_trace_arrays.prev, 259 typeof(*tr), list); 260 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 261 return tr; 262 } 263 264 #define FTRACE_CMP_TYPE(var, type) \ 265 __builtin_types_compatible_p(typeof(var), type *) 266 267 #undef IF_ASSIGN 268 #define IF_ASSIGN(var, entry, etype, id) \ 269 if (FTRACE_CMP_TYPE(var, etype)) { \ 270 var = (typeof(var))(entry); \ 271 WARN_ON(id && (entry)->type != id); \ 272 break; \ 273 } 274 275 /* Will cause compile errors if type is not found. */ 276 extern void __ftrace_bad_type(void); 277 278 /* 279 * The trace_assign_type is a verifier that the entry type is 280 * the same as the type being assigned. To add new types simply 281 * add a line with the following format: 282 * 283 * IF_ASSIGN(var, ent, type, id); 284 * 285 * Where "type" is the trace type that includes the trace_entry 286 * as the "ent" item. And "id" is the trace identifier that is 287 * used in the trace_type enum. 288 * 289 * If the type can have more than one id, then use zero. 290 */ 291 #define trace_assign_type(var, ent) \ 292 do { \ 293 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 294 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 295 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 296 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 297 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 298 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 299 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 300 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 301 TRACE_MMIO_RW); \ 302 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 303 TRACE_MMIO_MAP); \ 304 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 305 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 306 TRACE_GRAPH_ENT); \ 307 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 308 TRACE_GRAPH_RET); \ 309 __ftrace_bad_type(); \ 310 } while (0) 311 312 /* 313 * An option specific to a tracer. This is a boolean value. 314 * The bit is the bit index that sets its value on the 315 * flags value in struct tracer_flags. 316 */ 317 struct tracer_opt { 318 const char *name; /* Will appear on the trace_options file */ 319 u32 bit; /* Mask assigned in val field in tracer_flags */ 320 }; 321 322 /* 323 * The set of specific options for a tracer. Your tracer 324 * have to set the initial value of the flags val. 325 */ 326 struct tracer_flags { 327 u32 val; 328 struct tracer_opt *opts; 329 }; 330 331 /* Makes more easy to define a tracer opt */ 332 #define TRACER_OPT(s, b) .name = #s, .bit = b 333 334 335 /** 336 * struct tracer - a specific tracer and its callbacks to interact with debugfs 337 * @name: the name chosen to select it on the available_tracers file 338 * @init: called when one switches to this tracer (echo name > current_tracer) 339 * @reset: called when one switches to another tracer 340 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 341 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 342 * @update_thresh: called when tracing_thresh is updated 343 * @open: called when the trace file is opened 344 * @pipe_open: called when the trace_pipe file is opened 345 * @close: called when the trace file is released 346 * @pipe_close: called when the trace_pipe file is released 347 * @read: override the default read callback on trace_pipe 348 * @splice_read: override the default splice_read callback on trace_pipe 349 * @selftest: selftest to run on boot (see trace_selftest.c) 350 * @print_headers: override the first lines that describe your columns 351 * @print_line: callback that prints a trace 352 * @set_flag: signals one of your private flags changed (trace_options file) 353 * @flags: your private flags 354 */ 355 struct tracer { 356 const char *name; 357 int (*init)(struct trace_array *tr); 358 void (*reset)(struct trace_array *tr); 359 void (*start)(struct trace_array *tr); 360 void (*stop)(struct trace_array *tr); 361 int (*update_thresh)(struct trace_array *tr); 362 void (*open)(struct trace_iterator *iter); 363 void (*pipe_open)(struct trace_iterator *iter); 364 void (*close)(struct trace_iterator *iter); 365 void (*pipe_close)(struct trace_iterator *iter); 366 ssize_t (*read)(struct trace_iterator *iter, 367 struct file *filp, char __user *ubuf, 368 size_t cnt, loff_t *ppos); 369 ssize_t (*splice_read)(struct trace_iterator *iter, 370 struct file *filp, 371 loff_t *ppos, 372 struct pipe_inode_info *pipe, 373 size_t len, 374 unsigned int flags); 375 #ifdef CONFIG_FTRACE_STARTUP_TEST 376 int (*selftest)(struct tracer *trace, 377 struct trace_array *tr); 378 #endif 379 void (*print_header)(struct seq_file *m); 380 enum print_line_t (*print_line)(struct trace_iterator *iter); 381 /* If you handled the flag setting, return 0 */ 382 int (*set_flag)(struct trace_array *tr, 383 u32 old_flags, u32 bit, int set); 384 /* Return 0 if OK with change, else return non-zero */ 385 int (*flag_changed)(struct trace_array *tr, 386 u32 mask, int set); 387 struct tracer *next; 388 struct tracer_flags *flags; 389 int enabled; 390 bool print_max; 391 bool allow_instances; 392 #ifdef CONFIG_TRACER_MAX_TRACE 393 bool use_max_tr; 394 #endif 395 }; 396 397 398 /* Only current can touch trace_recursion */ 399 400 /* 401 * For function tracing recursion: 402 * The order of these bits are important. 403 * 404 * When function tracing occurs, the following steps are made: 405 * If arch does not support a ftrace feature: 406 * call internal function (uses INTERNAL bits) which calls... 407 * If callback is registered to the "global" list, the list 408 * function is called and recursion checks the GLOBAL bits. 409 * then this function calls... 410 * The function callback, which can use the FTRACE bits to 411 * check for recursion. 412 * 413 * Now if the arch does not suppport a feature, and it calls 414 * the global list function which calls the ftrace callback 415 * all three of these steps will do a recursion protection. 416 * There's no reason to do one if the previous caller already 417 * did. The recursion that we are protecting against will 418 * go through the same steps again. 419 * 420 * To prevent the multiple recursion checks, if a recursion 421 * bit is set that is higher than the MAX bit of the current 422 * check, then we know that the check was made by the previous 423 * caller, and we can skip the current check. 424 */ 425 enum { 426 TRACE_BUFFER_BIT, 427 TRACE_BUFFER_NMI_BIT, 428 TRACE_BUFFER_IRQ_BIT, 429 TRACE_BUFFER_SIRQ_BIT, 430 431 /* Start of function recursion bits */ 432 TRACE_FTRACE_BIT, 433 TRACE_FTRACE_NMI_BIT, 434 TRACE_FTRACE_IRQ_BIT, 435 TRACE_FTRACE_SIRQ_BIT, 436 437 /* INTERNAL_BITs must be greater than FTRACE_BITs */ 438 TRACE_INTERNAL_BIT, 439 TRACE_INTERNAL_NMI_BIT, 440 TRACE_INTERNAL_IRQ_BIT, 441 TRACE_INTERNAL_SIRQ_BIT, 442 443 TRACE_CONTROL_BIT, 444 445 /* 446 * Abuse of the trace_recursion. 447 * As we need a way to maintain state if we are tracing the function 448 * graph in irq because we want to trace a particular function that 449 * was called in irq context but we have irq tracing off. Since this 450 * can only be modified by current, we can reuse trace_recursion. 451 */ 452 TRACE_IRQ_BIT, 453 }; 454 455 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 456 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 457 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 458 459 #define TRACE_CONTEXT_BITS 4 460 461 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 462 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 463 464 #define TRACE_LIST_START TRACE_INTERNAL_BIT 465 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 466 467 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 468 469 static __always_inline int trace_get_context_bit(void) 470 { 471 int bit; 472 473 if (in_interrupt()) { 474 if (in_nmi()) 475 bit = 0; 476 477 else if (in_irq()) 478 bit = 1; 479 else 480 bit = 2; 481 } else 482 bit = 3; 483 484 return bit; 485 } 486 487 static __always_inline int trace_test_and_set_recursion(int start, int max) 488 { 489 unsigned int val = current->trace_recursion; 490 int bit; 491 492 /* A previous recursion check was made */ 493 if ((val & TRACE_CONTEXT_MASK) > max) 494 return 0; 495 496 bit = trace_get_context_bit() + start; 497 if (unlikely(val & (1 << bit))) 498 return -1; 499 500 val |= 1 << bit; 501 current->trace_recursion = val; 502 barrier(); 503 504 return bit; 505 } 506 507 static __always_inline void trace_clear_recursion(int bit) 508 { 509 unsigned int val = current->trace_recursion; 510 511 if (!bit) 512 return; 513 514 bit = 1 << bit; 515 val &= ~bit; 516 517 barrier(); 518 current->trace_recursion = val; 519 } 520 521 static inline struct ring_buffer_iter * 522 trace_buffer_iter(struct trace_iterator *iter, int cpu) 523 { 524 if (iter->buffer_iter && iter->buffer_iter[cpu]) 525 return iter->buffer_iter[cpu]; 526 return NULL; 527 } 528 529 int tracer_init(struct tracer *t, struct trace_array *tr); 530 int tracing_is_enabled(void); 531 void tracing_reset(struct trace_buffer *buf, int cpu); 532 void tracing_reset_online_cpus(struct trace_buffer *buf); 533 void tracing_reset_current(int cpu); 534 void tracing_reset_all_online_cpus(void); 535 int tracing_open_generic(struct inode *inode, struct file *filp); 536 bool tracing_is_disabled(void); 537 struct dentry *trace_create_file(const char *name, 538 umode_t mode, 539 struct dentry *parent, 540 void *data, 541 const struct file_operations *fops); 542 543 struct dentry *tracing_init_dentry_tr(struct trace_array *tr); 544 struct dentry *tracing_init_dentry(void); 545 546 struct ring_buffer_event; 547 548 struct ring_buffer_event * 549 trace_buffer_lock_reserve(struct ring_buffer *buffer, 550 int type, 551 unsigned long len, 552 unsigned long flags, 553 int pc); 554 555 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 556 struct trace_array_cpu *data); 557 558 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 559 int *ent_cpu, u64 *ent_ts); 560 561 void __buffer_unlock_commit(struct ring_buffer *buffer, 562 struct ring_buffer_event *event); 563 564 int trace_empty(struct trace_iterator *iter); 565 566 void *trace_find_next_entry_inc(struct trace_iterator *iter); 567 568 void trace_init_global_iter(struct trace_iterator *iter); 569 570 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 571 572 void tracing_sched_switch_trace(struct trace_array *tr, 573 struct task_struct *prev, 574 struct task_struct *next, 575 unsigned long flags, int pc); 576 577 void tracing_sched_wakeup_trace(struct trace_array *tr, 578 struct task_struct *wakee, 579 struct task_struct *cur, 580 unsigned long flags, int pc); 581 void trace_function(struct trace_array *tr, 582 unsigned long ip, 583 unsigned long parent_ip, 584 unsigned long flags, int pc); 585 void trace_graph_function(struct trace_array *tr, 586 unsigned long ip, 587 unsigned long parent_ip, 588 unsigned long flags, int pc); 589 void trace_latency_header(struct seq_file *m); 590 void trace_default_header(struct seq_file *m); 591 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 592 int trace_empty(struct trace_iterator *iter); 593 594 void trace_graph_return(struct ftrace_graph_ret *trace); 595 int trace_graph_entry(struct ftrace_graph_ent *trace); 596 void set_graph_array(struct trace_array *tr); 597 598 void tracing_start_cmdline_record(void); 599 void tracing_stop_cmdline_record(void); 600 void tracing_sched_switch_assign_trace(struct trace_array *tr); 601 void tracing_stop_sched_switch_record(void); 602 void tracing_start_sched_switch_record(void); 603 int register_tracer(struct tracer *type); 604 int is_tracing_stopped(void); 605 606 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 607 608 extern cpumask_var_t __read_mostly tracing_buffer_mask; 609 610 #define for_each_tracing_cpu(cpu) \ 611 for_each_cpu(cpu, tracing_buffer_mask) 612 613 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 614 615 extern unsigned long tracing_thresh; 616 617 #ifdef CONFIG_TRACER_MAX_TRACE 618 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 619 void update_max_tr_single(struct trace_array *tr, 620 struct task_struct *tsk, int cpu); 621 #endif /* CONFIG_TRACER_MAX_TRACE */ 622 623 #ifdef CONFIG_STACKTRACE 624 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 625 int skip, int pc); 626 627 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, 628 int skip, int pc, struct pt_regs *regs); 629 630 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 631 int pc); 632 633 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 634 int pc); 635 #else 636 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 637 unsigned long flags, int skip, int pc) 638 { 639 } 640 641 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, 642 unsigned long flags, int skip, 643 int pc, struct pt_regs *regs) 644 { 645 } 646 647 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 648 unsigned long flags, int pc) 649 { 650 } 651 652 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 653 int skip, int pc) 654 { 655 } 656 #endif /* CONFIG_STACKTRACE */ 657 658 extern cycle_t ftrace_now(int cpu); 659 660 extern void trace_find_cmdline(int pid, char comm[]); 661 662 #ifdef CONFIG_DYNAMIC_FTRACE 663 extern unsigned long ftrace_update_tot_cnt; 664 #endif 665 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 666 extern int DYN_FTRACE_TEST_NAME(void); 667 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 668 extern int DYN_FTRACE_TEST_NAME2(void); 669 670 extern bool ring_buffer_expanded; 671 extern bool tracing_selftest_disabled; 672 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 673 674 #ifdef CONFIG_FTRACE_STARTUP_TEST 675 extern int trace_selftest_startup_function(struct tracer *trace, 676 struct trace_array *tr); 677 extern int trace_selftest_startup_function_graph(struct tracer *trace, 678 struct trace_array *tr); 679 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 680 struct trace_array *tr); 681 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 682 struct trace_array *tr); 683 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 684 struct trace_array *tr); 685 extern int trace_selftest_startup_wakeup(struct tracer *trace, 686 struct trace_array *tr); 687 extern int trace_selftest_startup_nop(struct tracer *trace, 688 struct trace_array *tr); 689 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 690 struct trace_array *tr); 691 extern int trace_selftest_startup_branch(struct tracer *trace, 692 struct trace_array *tr); 693 /* 694 * Tracer data references selftest functions that only occur 695 * on boot up. These can be __init functions. Thus, when selftests 696 * are enabled, then the tracers need to reference __init functions. 697 */ 698 #define __tracer_data __refdata 699 #else 700 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 701 #define __tracer_data __read_mostly 702 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 703 704 extern void *head_page(struct trace_array_cpu *data); 705 extern unsigned long long ns2usecs(cycle_t nsec); 706 extern int 707 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 708 extern int 709 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 710 extern int 711 trace_array_vprintk(struct trace_array *tr, 712 unsigned long ip, const char *fmt, va_list args); 713 int trace_array_printk(struct trace_array *tr, 714 unsigned long ip, const char *fmt, ...); 715 int trace_array_printk_buf(struct ring_buffer *buffer, 716 unsigned long ip, const char *fmt, ...); 717 void trace_printk_seq(struct trace_seq *s); 718 enum print_line_t print_trace_line(struct trace_iterator *iter); 719 720 extern unsigned long trace_flags; 721 722 /* Standard output formatting function used for function return traces */ 723 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 724 725 /* Flag options */ 726 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 727 #define TRACE_GRAPH_PRINT_CPU 0x2 728 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 729 #define TRACE_GRAPH_PRINT_PROC 0x8 730 #define TRACE_GRAPH_PRINT_DURATION 0x10 731 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 732 #define TRACE_GRAPH_PRINT_IRQS 0x40 733 #define TRACE_GRAPH_PRINT_TAIL 0x80 734 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 735 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 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 enum print_line_t 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 int ftrace_event_is_function(struct ftrace_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 * trace_iterator_flags is an enumeration that defines bit 909 * positions into trace_flags that controls the output. 910 * 911 * NOTE: These bits must match the trace_options array in 912 * trace.c. 913 */ 914 enum trace_iterator_flags { 915 TRACE_ITER_PRINT_PARENT = 0x01, 916 TRACE_ITER_SYM_OFFSET = 0x02, 917 TRACE_ITER_SYM_ADDR = 0x04, 918 TRACE_ITER_VERBOSE = 0x08, 919 TRACE_ITER_RAW = 0x10, 920 TRACE_ITER_HEX = 0x20, 921 TRACE_ITER_BIN = 0x40, 922 TRACE_ITER_BLOCK = 0x80, 923 TRACE_ITER_STACKTRACE = 0x100, 924 TRACE_ITER_PRINTK = 0x200, 925 TRACE_ITER_PREEMPTONLY = 0x400, 926 TRACE_ITER_BRANCH = 0x800, 927 TRACE_ITER_ANNOTATE = 0x1000, 928 TRACE_ITER_USERSTACKTRACE = 0x2000, 929 TRACE_ITER_SYM_USEROBJ = 0x4000, 930 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 931 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 932 TRACE_ITER_LATENCY_FMT = 0x20000, 933 TRACE_ITER_SLEEP_TIME = 0x40000, 934 TRACE_ITER_GRAPH_TIME = 0x80000, 935 TRACE_ITER_RECORD_CMD = 0x100000, 936 TRACE_ITER_OVERWRITE = 0x200000, 937 TRACE_ITER_STOP_ON_FREE = 0x400000, 938 TRACE_ITER_IRQ_INFO = 0x800000, 939 TRACE_ITER_MARKERS = 0x1000000, 940 TRACE_ITER_FUNCTION = 0x2000000, 941 }; 942 943 /* 944 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 945 * control the output of kernel symbols. 946 */ 947 #define TRACE_ITER_SYM_MASK \ 948 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 949 950 extern struct tracer nop_trace; 951 952 #ifdef CONFIG_BRANCH_TRACER 953 extern int enable_branch_tracing(struct trace_array *tr); 954 extern void disable_branch_tracing(void); 955 static inline int trace_branch_enable(struct trace_array *tr) 956 { 957 if (trace_flags & TRACE_ITER_BRANCH) 958 return enable_branch_tracing(tr); 959 return 0; 960 } 961 static inline void trace_branch_disable(void) 962 { 963 /* due to races, always disable */ 964 disable_branch_tracing(); 965 } 966 #else 967 static inline int trace_branch_enable(struct trace_array *tr) 968 { 969 return 0; 970 } 971 static inline void trace_branch_disable(void) 972 { 973 } 974 #endif /* CONFIG_BRANCH_TRACER */ 975 976 /* set ring buffers to default size if not already done so */ 977 int tracing_update_buffers(void); 978 979 struct ftrace_event_field { 980 struct list_head link; 981 const char *name; 982 const char *type; 983 int filter_type; 984 int offset; 985 int size; 986 int is_signed; 987 }; 988 989 struct event_filter { 990 int n_preds; /* Number assigned */ 991 int a_preds; /* allocated */ 992 struct filter_pred *preds; 993 struct filter_pred *root; 994 char *filter_string; 995 }; 996 997 struct event_subsystem { 998 struct list_head list; 999 const char *name; 1000 struct event_filter *filter; 1001 int ref_count; 1002 }; 1003 1004 struct ftrace_subsystem_dir { 1005 struct list_head list; 1006 struct event_subsystem *subsystem; 1007 struct trace_array *tr; 1008 struct dentry *entry; 1009 int ref_count; 1010 int nr_events; 1011 }; 1012 1013 #define FILTER_PRED_INVALID ((unsigned short)-1) 1014 #define FILTER_PRED_IS_RIGHT (1 << 15) 1015 #define FILTER_PRED_FOLD (1 << 15) 1016 1017 /* 1018 * The max preds is the size of unsigned short with 1019 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1020 * and FOLD flags. The other is reserved. 1021 * 1022 * 2^14 preds is way more than enough. 1023 */ 1024 #define MAX_FILTER_PRED 16384 1025 1026 struct filter_pred; 1027 struct regex; 1028 1029 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1030 1031 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1032 1033 enum regex_type { 1034 MATCH_FULL = 0, 1035 MATCH_FRONT_ONLY, 1036 MATCH_MIDDLE_ONLY, 1037 MATCH_END_ONLY, 1038 }; 1039 1040 struct regex { 1041 char pattern[MAX_FILTER_STR_VAL]; 1042 int len; 1043 int field_len; 1044 regex_match_func match; 1045 }; 1046 1047 struct filter_pred { 1048 filter_pred_fn_t fn; 1049 u64 val; 1050 struct regex regex; 1051 unsigned short *ops; 1052 struct ftrace_event_field *field; 1053 int offset; 1054 int not; 1055 int op; 1056 unsigned short index; 1057 unsigned short parent; 1058 unsigned short left; 1059 unsigned short right; 1060 }; 1061 1062 extern enum regex_type 1063 filter_parse_regex(char *buff, int len, char **search, int *not); 1064 extern void print_event_filter(struct ftrace_event_file *file, 1065 struct trace_seq *s); 1066 extern int apply_event_filter(struct ftrace_event_file *file, 1067 char *filter_string); 1068 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir, 1069 char *filter_string); 1070 extern void print_subsystem_event_filter(struct event_subsystem *system, 1071 struct trace_seq *s); 1072 extern int filter_assign_type(const char *type); 1073 extern int create_event_filter(struct ftrace_event_call *call, 1074 char *filter_str, bool set_str, 1075 struct event_filter **filterp); 1076 extern void free_event_filter(struct event_filter *filter); 1077 1078 struct ftrace_event_field * 1079 trace_find_event_field(struct ftrace_event_call *call, char *name); 1080 1081 extern void trace_event_enable_cmd_record(bool enable); 1082 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1083 extern int event_trace_del_tracer(struct trace_array *tr); 1084 1085 extern struct ftrace_event_file *find_event_file(struct trace_array *tr, 1086 const char *system, 1087 const char *event); 1088 1089 static inline void *event_file_data(struct file *filp) 1090 { 1091 return ACCESS_ONCE(file_inode(filp)->i_private); 1092 } 1093 1094 extern struct mutex event_mutex; 1095 extern struct list_head ftrace_events; 1096 1097 extern const struct file_operations event_trigger_fops; 1098 1099 extern int register_trigger_cmds(void); 1100 extern void clear_event_triggers(struct trace_array *tr); 1101 1102 struct event_trigger_data { 1103 unsigned long count; 1104 int ref; 1105 struct event_trigger_ops *ops; 1106 struct event_command *cmd_ops; 1107 struct event_filter __rcu *filter; 1108 char *filter_str; 1109 void *private_data; 1110 struct list_head list; 1111 }; 1112 1113 /** 1114 * struct event_trigger_ops - callbacks for trace event triggers 1115 * 1116 * The methods in this structure provide per-event trigger hooks for 1117 * various trigger operations. 1118 * 1119 * All the methods below, except for @init() and @free(), must be 1120 * implemented. 1121 * 1122 * @func: The trigger 'probe' function called when the triggering 1123 * event occurs. The data passed into this callback is the data 1124 * that was supplied to the event_command @reg() function that 1125 * registered the trigger (see struct event_command). 1126 * 1127 * @init: An optional initialization function called for the trigger 1128 * when the trigger is registered (via the event_command reg() 1129 * function). This can be used to perform per-trigger 1130 * initialization such as incrementing a per-trigger reference 1131 * count, for instance. This is usually implemented by the 1132 * generic utility function @event_trigger_init() (see 1133 * trace_event_triggers.c). 1134 * 1135 * @free: An optional de-initialization function called for the 1136 * trigger when the trigger is unregistered (via the 1137 * event_command @reg() function). This can be used to perform 1138 * per-trigger de-initialization such as decrementing a 1139 * per-trigger reference count and freeing corresponding trigger 1140 * data, for instance. This is usually implemented by the 1141 * generic utility function @event_trigger_free() (see 1142 * trace_event_triggers.c). 1143 * 1144 * @print: The callback function invoked to have the trigger print 1145 * itself. This is usually implemented by a wrapper function 1146 * that calls the generic utility function @event_trigger_print() 1147 * (see trace_event_triggers.c). 1148 */ 1149 struct event_trigger_ops { 1150 void (*func)(struct event_trigger_data *data); 1151 int (*init)(struct event_trigger_ops *ops, 1152 struct event_trigger_data *data); 1153 void (*free)(struct event_trigger_ops *ops, 1154 struct event_trigger_data *data); 1155 int (*print)(struct seq_file *m, 1156 struct event_trigger_ops *ops, 1157 struct event_trigger_data *data); 1158 }; 1159 1160 /** 1161 * struct event_command - callbacks and data members for event commands 1162 * 1163 * Event commands are invoked by users by writing the command name 1164 * into the 'trigger' file associated with a trace event. The 1165 * parameters associated with a specific invocation of an event 1166 * command are used to create an event trigger instance, which is 1167 * added to the list of trigger instances associated with that trace 1168 * event. When the event is hit, the set of triggers associated with 1169 * that event is invoked. 1170 * 1171 * The data members in this structure provide per-event command data 1172 * for various event commands. 1173 * 1174 * All the data members below, except for @post_trigger, must be set 1175 * for each event command. 1176 * 1177 * @name: The unique name that identifies the event command. This is 1178 * the name used when setting triggers via trigger files. 1179 * 1180 * @trigger_type: A unique id that identifies the event command 1181 * 'type'. This value has two purposes, the first to ensure that 1182 * only one trigger of the same type can be set at a given time 1183 * for a particular event e.g. it doesn't make sense to have both 1184 * a traceon and traceoff trigger attached to a single event at 1185 * the same time, so traceon and traceoff have the same type 1186 * though they have different names. The @trigger_type value is 1187 * also used as a bit value for deferring the actual trigger 1188 * action until after the current event is finished. Some 1189 * commands need to do this if they themselves log to the trace 1190 * buffer (see the @post_trigger() member below). @trigger_type 1191 * values are defined by adding new values to the trigger_type 1192 * enum in include/linux/ftrace_event.h. 1193 * 1194 * @post_trigger: A flag that says whether or not this command needs 1195 * to have its action delayed until after the current event has 1196 * been closed. Some triggers need to avoid being invoked while 1197 * an event is currently in the process of being logged, since 1198 * the trigger may itself log data into the trace buffer. Thus 1199 * we make sure the current event is committed before invoking 1200 * those triggers. To do that, the trigger invocation is split 1201 * in two - the first part checks the filter using the current 1202 * trace record; if a command has the @post_trigger flag set, it 1203 * sets a bit for itself in the return value, otherwise it 1204 * directly invokes the trigger. Once all commands have been 1205 * either invoked or set their return flag, the current record is 1206 * either committed or discarded. At that point, if any commands 1207 * have deferred their triggers, those commands are finally 1208 * invoked following the close of the current event. In other 1209 * words, if the event_trigger_ops @func() probe implementation 1210 * itself logs to the trace buffer, this flag should be set, 1211 * otherwise it can be left unspecified. 1212 * 1213 * All the methods below, except for @set_filter(), must be 1214 * implemented. 1215 * 1216 * @func: The callback function responsible for parsing and 1217 * registering the trigger written to the 'trigger' file by the 1218 * user. It allocates the trigger instance and registers it with 1219 * the appropriate trace event. It makes use of the other 1220 * event_command callback functions to orchestrate this, and is 1221 * usually implemented by the generic utility function 1222 * @event_trigger_callback() (see trace_event_triggers.c). 1223 * 1224 * @reg: Adds the trigger to the list of triggers associated with the 1225 * event, and enables the event trigger itself, after 1226 * initializing it (via the event_trigger_ops @init() function). 1227 * This is also where commands can use the @trigger_type value to 1228 * make the decision as to whether or not multiple instances of 1229 * the trigger should be allowed. This is usually implemented by 1230 * the generic utility function @register_trigger() (see 1231 * trace_event_triggers.c). 1232 * 1233 * @unreg: Removes the trigger from the list of triggers associated 1234 * with the event, and disables the event trigger itself, after 1235 * initializing it (via the event_trigger_ops @free() function). 1236 * This is usually implemented by the generic utility function 1237 * @unregister_trigger() (see trace_event_triggers.c). 1238 * 1239 * @set_filter: An optional function called to parse and set a filter 1240 * for the trigger. If no @set_filter() method is set for the 1241 * event command, filters set by the user for the command will be 1242 * ignored. This is usually implemented by the generic utility 1243 * function @set_trigger_filter() (see trace_event_triggers.c). 1244 * 1245 * @get_trigger_ops: The callback function invoked to retrieve the 1246 * event_trigger_ops implementation associated with the command. 1247 */ 1248 struct event_command { 1249 struct list_head list; 1250 char *name; 1251 enum event_trigger_type trigger_type; 1252 bool post_trigger; 1253 int (*func)(struct event_command *cmd_ops, 1254 struct ftrace_event_file *file, 1255 char *glob, char *cmd, char *params); 1256 int (*reg)(char *glob, 1257 struct event_trigger_ops *ops, 1258 struct event_trigger_data *data, 1259 struct ftrace_event_file *file); 1260 void (*unreg)(char *glob, 1261 struct event_trigger_ops *ops, 1262 struct event_trigger_data *data, 1263 struct ftrace_event_file *file); 1264 int (*set_filter)(char *filter_str, 1265 struct event_trigger_data *data, 1266 struct ftrace_event_file *file); 1267 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1268 }; 1269 1270 extern int trace_event_enable_disable(struct ftrace_event_file *file, 1271 int enable, int soft_disable); 1272 extern int tracing_alloc_snapshot(void); 1273 1274 extern const char *__start___trace_bprintk_fmt[]; 1275 extern const char *__stop___trace_bprintk_fmt[]; 1276 1277 extern const char *__start___tracepoint_str[]; 1278 extern const char *__stop___tracepoint_str[]; 1279 1280 void trace_printk_init_buffers(void); 1281 void trace_printk_start_comm(void); 1282 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1283 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1284 1285 /* 1286 * Normal trace_printk() and friends allocates special buffers 1287 * to do the manipulation, as well as saves the print formats 1288 * into sections to display. But the trace infrastructure wants 1289 * to use these without the added overhead at the price of being 1290 * a bit slower (used mainly for warnings, where we don't care 1291 * about performance). The internal_trace_puts() is for such 1292 * a purpose. 1293 */ 1294 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1295 1296 #undef FTRACE_ENTRY 1297 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1298 extern struct ftrace_event_call \ 1299 __aligned(4) event_##call; 1300 #undef FTRACE_ENTRY_DUP 1301 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1302 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1303 filter) 1304 #include "trace_entries.h" 1305 1306 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1307 int perf_ftrace_event_register(struct ftrace_event_call *call, 1308 enum trace_reg type, void *data); 1309 #else 1310 #define perf_ftrace_event_register NULL 1311 #endif 1312 1313 #endif /* _LINUX_KERNEL_TRACE_H */ 1314