1 // SPDX-License-Identifier: GPL-2.0 2 3 #ifndef _LINUX_KERNEL_TRACE_H 4 #define _LINUX_KERNEL_TRACE_H 5 6 #include <linux/fs.h> 7 #include <linux/atomic.h> 8 #include <linux/sched.h> 9 #include <linux/clocksource.h> 10 #include <linux/ring_buffer.h> 11 #include <linux/mmiotrace.h> 12 #include <linux/tracepoint.h> 13 #include <linux/ftrace.h> 14 #include <linux/hw_breakpoint.h> 15 #include <linux/trace_seq.h> 16 #include <linux/trace_events.h> 17 #include <linux/compiler.h> 18 #include <linux/trace_seq.h> 19 #include <linux/glob.h> 20 21 #ifdef CONFIG_FTRACE_SYSCALLS 22 #include <asm/unistd.h> /* For NR_SYSCALLS */ 23 #include <asm/syscall.h> /* some archs define it here */ 24 #endif 25 26 enum trace_type { 27 __TRACE_FIRST_TYPE = 0, 28 29 TRACE_FN, 30 TRACE_CTX, 31 TRACE_WAKE, 32 TRACE_STACK, 33 TRACE_PRINT, 34 TRACE_BPRINT, 35 TRACE_MMIO_RW, 36 TRACE_MMIO_MAP, 37 TRACE_BRANCH, 38 TRACE_GRAPH_RET, 39 TRACE_GRAPH_ENT, 40 TRACE_USER_STACK, 41 TRACE_BLK, 42 TRACE_BPUTS, 43 TRACE_HWLAT, 44 TRACE_RAW_DATA, 45 46 __TRACE_LAST_TYPE, 47 }; 48 49 50 #undef __field 51 #define __field(type, item) type item; 52 53 #undef __field_struct 54 #define __field_struct(type, item) __field(type, item) 55 56 #undef __field_desc 57 #define __field_desc(type, container, item) 58 59 #undef __array 60 #define __array(type, item, size) type item[size]; 61 62 #undef __array_desc 63 #define __array_desc(type, container, item, size) 64 65 #undef __dynamic_array 66 #define __dynamic_array(type, item) type item[]; 67 68 #undef F_STRUCT 69 #define F_STRUCT(args...) args 70 71 #undef FTRACE_ENTRY 72 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 73 struct struct_name { \ 74 struct trace_entry ent; \ 75 tstruct \ 76 } 77 78 #undef FTRACE_ENTRY_DUP 79 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) 80 81 #undef FTRACE_ENTRY_REG 82 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 83 filter, regfn) \ 84 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 85 filter) 86 87 #undef FTRACE_ENTRY_PACKED 88 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \ 89 filter) \ 90 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 91 filter) __packed 92 93 #include "trace_entries.h" 94 95 /* 96 * syscalls are special, and need special handling, this is why 97 * they are not included in trace_entries.h 98 */ 99 struct syscall_trace_enter { 100 struct trace_entry ent; 101 int nr; 102 unsigned long args[]; 103 }; 104 105 struct syscall_trace_exit { 106 struct trace_entry ent; 107 int nr; 108 long ret; 109 }; 110 111 struct kprobe_trace_entry_head { 112 struct trace_entry ent; 113 unsigned long ip; 114 }; 115 116 struct kretprobe_trace_entry_head { 117 struct trace_entry ent; 118 unsigned long func; 119 unsigned long ret_ip; 120 }; 121 122 /* 123 * trace_flag_type is an enumeration that holds different 124 * states when a trace occurs. These are: 125 * IRQS_OFF - interrupts were disabled 126 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 127 * NEED_RESCHED - reschedule is requested 128 * HARDIRQ - inside an interrupt handler 129 * SOFTIRQ - inside a softirq handler 130 */ 131 enum trace_flag_type { 132 TRACE_FLAG_IRQS_OFF = 0x01, 133 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 134 TRACE_FLAG_NEED_RESCHED = 0x04, 135 TRACE_FLAG_HARDIRQ = 0x08, 136 TRACE_FLAG_SOFTIRQ = 0x10, 137 TRACE_FLAG_PREEMPT_RESCHED = 0x20, 138 TRACE_FLAG_NMI = 0x40, 139 }; 140 141 #define TRACE_BUF_SIZE 1024 142 143 struct trace_array; 144 145 /* 146 * The CPU trace array - it consists of thousands of trace entries 147 * plus some other descriptor data: (for example which task started 148 * the trace, etc.) 149 */ 150 struct trace_array_cpu { 151 atomic_t disabled; 152 void *buffer_page; /* ring buffer spare */ 153 154 unsigned long entries; 155 unsigned long saved_latency; 156 unsigned long critical_start; 157 unsigned long critical_end; 158 unsigned long critical_sequence; 159 unsigned long nice; 160 unsigned long policy; 161 unsigned long rt_priority; 162 unsigned long skipped_entries; 163 u64 preempt_timestamp; 164 pid_t pid; 165 kuid_t uid; 166 char comm[TASK_COMM_LEN]; 167 168 bool ignore_pid; 169 #ifdef CONFIG_FUNCTION_TRACER 170 bool ftrace_ignore_pid; 171 #endif 172 }; 173 174 struct tracer; 175 struct trace_option_dentry; 176 177 struct trace_buffer { 178 struct trace_array *tr; 179 struct ring_buffer *buffer; 180 struct trace_array_cpu __percpu *data; 181 u64 time_start; 182 int cpu; 183 }; 184 185 #define TRACE_FLAGS_MAX_SIZE 32 186 187 struct trace_options { 188 struct tracer *tracer; 189 struct trace_option_dentry *topts; 190 }; 191 192 struct trace_pid_list { 193 int pid_max; 194 unsigned long *pids; 195 }; 196 197 /* 198 * The trace array - an array of per-CPU trace arrays. This is the 199 * highest level data structure that individual tracers deal with. 200 * They have on/off state as well: 201 */ 202 struct trace_array { 203 struct list_head list; 204 char *name; 205 struct trace_buffer trace_buffer; 206 #ifdef CONFIG_TRACER_MAX_TRACE 207 /* 208 * The max_buffer is used to snapshot the trace when a maximum 209 * latency is reached, or when the user initiates a snapshot. 210 * Some tracers will use this to store a maximum trace while 211 * it continues examining live traces. 212 * 213 * The buffers for the max_buffer are set up the same as the trace_buffer 214 * When a snapshot is taken, the buffer of the max_buffer is swapped 215 * with the buffer of the trace_buffer and the buffers are reset for 216 * the trace_buffer so the tracing can continue. 217 */ 218 struct trace_buffer max_buffer; 219 bool allocated_snapshot; 220 #endif 221 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) 222 unsigned long max_latency; 223 #endif 224 struct trace_pid_list __rcu *filtered_pids; 225 /* 226 * max_lock is used to protect the swapping of buffers 227 * when taking a max snapshot. The buffers themselves are 228 * protected by per_cpu spinlocks. But the action of the swap 229 * needs its own lock. 230 * 231 * This is defined as a arch_spinlock_t in order to help 232 * with performance when lockdep debugging is enabled. 233 * 234 * It is also used in other places outside the update_max_tr 235 * so it needs to be defined outside of the 236 * CONFIG_TRACER_MAX_TRACE. 237 */ 238 arch_spinlock_t max_lock; 239 int buffer_disabled; 240 #ifdef CONFIG_FTRACE_SYSCALLS 241 int sys_refcount_enter; 242 int sys_refcount_exit; 243 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 244 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 245 #endif 246 int stop_count; 247 int clock_id; 248 int nr_topts; 249 bool clear_trace; 250 struct tracer *current_trace; 251 unsigned int trace_flags; 252 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 253 unsigned int flags; 254 raw_spinlock_t start_lock; 255 struct dentry *dir; 256 struct dentry *options; 257 struct dentry *percpu_dir; 258 struct dentry *event_dir; 259 struct trace_options *topts; 260 struct list_head systems; 261 struct list_head events; 262 struct trace_event_file *trace_marker_file; 263 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 264 int ref; 265 #ifdef CONFIG_FUNCTION_TRACER 266 struct ftrace_ops *ops; 267 struct trace_pid_list __rcu *function_pids; 268 #ifdef CONFIG_DYNAMIC_FTRACE 269 /* All of these are protected by the ftrace_lock */ 270 struct list_head func_probes; 271 struct list_head mod_trace; 272 struct list_head mod_notrace; 273 #endif 274 /* function tracing enabled */ 275 int function_enabled; 276 #endif 277 int time_stamp_abs_ref; 278 struct list_head hist_vars; 279 }; 280 281 enum { 282 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 283 }; 284 285 extern struct list_head ftrace_trace_arrays; 286 287 extern struct mutex trace_types_lock; 288 289 extern int trace_array_get(struct trace_array *tr); 290 extern void trace_array_put(struct trace_array *tr); 291 292 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs); 293 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 294 295 extern bool trace_clock_in_ns(struct trace_array *tr); 296 297 /* 298 * The global tracer (top) should be the first trace array added, 299 * but we check the flag anyway. 300 */ 301 static inline struct trace_array *top_trace_array(void) 302 { 303 struct trace_array *tr; 304 305 if (list_empty(&ftrace_trace_arrays)) 306 return NULL; 307 308 tr = list_entry(ftrace_trace_arrays.prev, 309 typeof(*tr), list); 310 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 311 return tr; 312 } 313 314 #define FTRACE_CMP_TYPE(var, type) \ 315 __builtin_types_compatible_p(typeof(var), type *) 316 317 #undef IF_ASSIGN 318 #define IF_ASSIGN(var, entry, etype, id) \ 319 if (FTRACE_CMP_TYPE(var, etype)) { \ 320 var = (typeof(var))(entry); \ 321 WARN_ON(id && (entry)->type != id); \ 322 break; \ 323 } 324 325 /* Will cause compile errors if type is not found. */ 326 extern void __ftrace_bad_type(void); 327 328 /* 329 * The trace_assign_type is a verifier that the entry type is 330 * the same as the type being assigned. To add new types simply 331 * add a line with the following format: 332 * 333 * IF_ASSIGN(var, ent, type, id); 334 * 335 * Where "type" is the trace type that includes the trace_entry 336 * as the "ent" item. And "id" is the trace identifier that is 337 * used in the trace_type enum. 338 * 339 * If the type can have more than one id, then use zero. 340 */ 341 #define trace_assign_type(var, ent) \ 342 do { \ 343 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 344 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 345 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 346 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 347 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 348 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 349 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 350 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 351 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 352 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 353 TRACE_MMIO_RW); \ 354 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 355 TRACE_MMIO_MAP); \ 356 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 357 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 358 TRACE_GRAPH_ENT); \ 359 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 360 TRACE_GRAPH_RET); \ 361 __ftrace_bad_type(); \ 362 } while (0) 363 364 /* 365 * An option specific to a tracer. This is a boolean value. 366 * The bit is the bit index that sets its value on the 367 * flags value in struct tracer_flags. 368 */ 369 struct tracer_opt { 370 const char *name; /* Will appear on the trace_options file */ 371 u32 bit; /* Mask assigned in val field in tracer_flags */ 372 }; 373 374 /* 375 * The set of specific options for a tracer. Your tracer 376 * have to set the initial value of the flags val. 377 */ 378 struct tracer_flags { 379 u32 val; 380 struct tracer_opt *opts; 381 struct tracer *trace; 382 }; 383 384 /* Makes more easy to define a tracer opt */ 385 #define TRACER_OPT(s, b) .name = #s, .bit = b 386 387 388 struct trace_option_dentry { 389 struct tracer_opt *opt; 390 struct tracer_flags *flags; 391 struct trace_array *tr; 392 struct dentry *entry; 393 }; 394 395 /** 396 * struct tracer - a specific tracer and its callbacks to interact with tracefs 397 * @name: the name chosen to select it on the available_tracers file 398 * @init: called when one switches to this tracer (echo name > current_tracer) 399 * @reset: called when one switches to another tracer 400 * @start: called when tracing is unpaused (echo 1 > tracing_on) 401 * @stop: called when tracing is paused (echo 0 > tracing_on) 402 * @update_thresh: called when tracing_thresh is updated 403 * @open: called when the trace file is opened 404 * @pipe_open: called when the trace_pipe file is opened 405 * @close: called when the trace file is released 406 * @pipe_close: called when the trace_pipe file is released 407 * @read: override the default read callback on trace_pipe 408 * @splice_read: override the default splice_read callback on trace_pipe 409 * @selftest: selftest to run on boot (see trace_selftest.c) 410 * @print_headers: override the first lines that describe your columns 411 * @print_line: callback that prints a trace 412 * @set_flag: signals one of your private flags changed (trace_options file) 413 * @flags: your private flags 414 */ 415 struct tracer { 416 const char *name; 417 int (*init)(struct trace_array *tr); 418 void (*reset)(struct trace_array *tr); 419 void (*start)(struct trace_array *tr); 420 void (*stop)(struct trace_array *tr); 421 int (*update_thresh)(struct trace_array *tr); 422 void (*open)(struct trace_iterator *iter); 423 void (*pipe_open)(struct trace_iterator *iter); 424 void (*close)(struct trace_iterator *iter); 425 void (*pipe_close)(struct trace_iterator *iter); 426 ssize_t (*read)(struct trace_iterator *iter, 427 struct file *filp, char __user *ubuf, 428 size_t cnt, loff_t *ppos); 429 ssize_t (*splice_read)(struct trace_iterator *iter, 430 struct file *filp, 431 loff_t *ppos, 432 struct pipe_inode_info *pipe, 433 size_t len, 434 unsigned int flags); 435 #ifdef CONFIG_FTRACE_STARTUP_TEST 436 int (*selftest)(struct tracer *trace, 437 struct trace_array *tr); 438 #endif 439 void (*print_header)(struct seq_file *m); 440 enum print_line_t (*print_line)(struct trace_iterator *iter); 441 /* If you handled the flag setting, return 0 */ 442 int (*set_flag)(struct trace_array *tr, 443 u32 old_flags, u32 bit, int set); 444 /* Return 0 if OK with change, else return non-zero */ 445 int (*flag_changed)(struct trace_array *tr, 446 u32 mask, int set); 447 struct tracer *next; 448 struct tracer_flags *flags; 449 int enabled; 450 int ref; 451 bool print_max; 452 bool allow_instances; 453 #ifdef CONFIG_TRACER_MAX_TRACE 454 bool use_max_tr; 455 #endif 456 /* True if tracer cannot be enabled in kernel param */ 457 bool noboot; 458 }; 459 460 461 /* Only current can touch trace_recursion */ 462 463 /* 464 * For function tracing recursion: 465 * The order of these bits are important. 466 * 467 * When function tracing occurs, the following steps are made: 468 * If arch does not support a ftrace feature: 469 * call internal function (uses INTERNAL bits) which calls... 470 * If callback is registered to the "global" list, the list 471 * function is called and recursion checks the GLOBAL bits. 472 * then this function calls... 473 * The function callback, which can use the FTRACE bits to 474 * check for recursion. 475 * 476 * Now if the arch does not suppport a feature, and it calls 477 * the global list function which calls the ftrace callback 478 * all three of these steps will do a recursion protection. 479 * There's no reason to do one if the previous caller already 480 * did. The recursion that we are protecting against will 481 * go through the same steps again. 482 * 483 * To prevent the multiple recursion checks, if a recursion 484 * bit is set that is higher than the MAX bit of the current 485 * check, then we know that the check was made by the previous 486 * caller, and we can skip the current check. 487 */ 488 enum { 489 TRACE_BUFFER_BIT, 490 TRACE_BUFFER_NMI_BIT, 491 TRACE_BUFFER_IRQ_BIT, 492 TRACE_BUFFER_SIRQ_BIT, 493 494 /* Start of function recursion bits */ 495 TRACE_FTRACE_BIT, 496 TRACE_FTRACE_NMI_BIT, 497 TRACE_FTRACE_IRQ_BIT, 498 TRACE_FTRACE_SIRQ_BIT, 499 500 /* INTERNAL_BITs must be greater than FTRACE_BITs */ 501 TRACE_INTERNAL_BIT, 502 TRACE_INTERNAL_NMI_BIT, 503 TRACE_INTERNAL_IRQ_BIT, 504 TRACE_INTERNAL_SIRQ_BIT, 505 506 TRACE_BRANCH_BIT, 507 /* 508 * Abuse of the trace_recursion. 509 * As we need a way to maintain state if we are tracing the function 510 * graph in irq because we want to trace a particular function that 511 * was called in irq context but we have irq tracing off. Since this 512 * can only be modified by current, we can reuse trace_recursion. 513 */ 514 TRACE_IRQ_BIT, 515 516 /* Set if the function is in the set_graph_function file */ 517 TRACE_GRAPH_BIT, 518 519 /* 520 * In the very unlikely case that an interrupt came in 521 * at a start of graph tracing, and we want to trace 522 * the function in that interrupt, the depth can be greater 523 * than zero, because of the preempted start of a previous 524 * trace. In an even more unlikely case, depth could be 2 525 * if a softirq interrupted the start of graph tracing, 526 * followed by an interrupt preempting a start of graph 527 * tracing in the softirq, and depth can even be 3 528 * if an NMI came in at the start of an interrupt function 529 * that preempted a softirq start of a function that 530 * preempted normal context!!!! Luckily, it can't be 531 * greater than 3, so the next two bits are a mask 532 * of what the depth is when we set TRACE_GRAPH_BIT 533 */ 534 535 TRACE_GRAPH_DEPTH_START_BIT, 536 TRACE_GRAPH_DEPTH_END_BIT, 537 }; 538 539 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 540 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 541 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 542 543 #define trace_recursion_depth() \ 544 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3) 545 #define trace_recursion_set_depth(depth) \ 546 do { \ 547 current->trace_recursion &= \ 548 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \ 549 current->trace_recursion |= \ 550 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \ 551 } while (0) 552 553 #define TRACE_CONTEXT_BITS 4 554 555 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 556 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 557 558 #define TRACE_LIST_START TRACE_INTERNAL_BIT 559 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 560 561 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 562 563 static __always_inline int trace_get_context_bit(void) 564 { 565 int bit; 566 567 if (in_interrupt()) { 568 if (in_nmi()) 569 bit = 0; 570 571 else if (in_irq()) 572 bit = 1; 573 else 574 bit = 2; 575 } else 576 bit = 3; 577 578 return bit; 579 } 580 581 static __always_inline int trace_test_and_set_recursion(int start, int max) 582 { 583 unsigned int val = current->trace_recursion; 584 int bit; 585 586 /* A previous recursion check was made */ 587 if ((val & TRACE_CONTEXT_MASK) > max) 588 return 0; 589 590 bit = trace_get_context_bit() + start; 591 if (unlikely(val & (1 << bit))) 592 return -1; 593 594 val |= 1 << bit; 595 current->trace_recursion = val; 596 barrier(); 597 598 return bit; 599 } 600 601 static __always_inline void trace_clear_recursion(int bit) 602 { 603 unsigned int val = current->trace_recursion; 604 605 if (!bit) 606 return; 607 608 bit = 1 << bit; 609 val &= ~bit; 610 611 barrier(); 612 current->trace_recursion = val; 613 } 614 615 static inline struct ring_buffer_iter * 616 trace_buffer_iter(struct trace_iterator *iter, int cpu) 617 { 618 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 619 } 620 621 int tracer_init(struct tracer *t, struct trace_array *tr); 622 int tracing_is_enabled(void); 623 void tracing_reset(struct trace_buffer *buf, int cpu); 624 void tracing_reset_online_cpus(struct trace_buffer *buf); 625 void tracing_reset_current(int cpu); 626 void tracing_reset_all_online_cpus(void); 627 int tracing_open_generic(struct inode *inode, struct file *filp); 628 bool tracing_is_disabled(void); 629 bool tracer_tracing_is_on(struct trace_array *tr); 630 void tracer_tracing_on(struct trace_array *tr); 631 void tracer_tracing_off(struct trace_array *tr); 632 struct dentry *trace_create_file(const char *name, 633 umode_t mode, 634 struct dentry *parent, 635 void *data, 636 const struct file_operations *fops); 637 638 struct dentry *tracing_init_dentry(void); 639 640 struct ring_buffer_event; 641 642 struct ring_buffer_event * 643 trace_buffer_lock_reserve(struct ring_buffer *buffer, 644 int type, 645 unsigned long len, 646 unsigned long flags, 647 int pc); 648 649 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 650 struct trace_array_cpu *data); 651 652 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 653 int *ent_cpu, u64 *ent_ts); 654 655 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer, 656 struct ring_buffer_event *event); 657 658 int trace_empty(struct trace_iterator *iter); 659 660 void *trace_find_next_entry_inc(struct trace_iterator *iter); 661 662 void trace_init_global_iter(struct trace_iterator *iter); 663 664 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 665 666 void trace_function(struct trace_array *tr, 667 unsigned long ip, 668 unsigned long parent_ip, 669 unsigned long flags, int pc); 670 void trace_graph_function(struct trace_array *tr, 671 unsigned long ip, 672 unsigned long parent_ip, 673 unsigned long flags, int pc); 674 void trace_latency_header(struct seq_file *m); 675 void trace_default_header(struct seq_file *m); 676 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 677 int trace_empty(struct trace_iterator *iter); 678 679 void trace_graph_return(struct ftrace_graph_ret *trace); 680 int trace_graph_entry(struct ftrace_graph_ent *trace); 681 void set_graph_array(struct trace_array *tr); 682 683 void tracing_start_cmdline_record(void); 684 void tracing_stop_cmdline_record(void); 685 void tracing_start_tgid_record(void); 686 void tracing_stop_tgid_record(void); 687 688 int register_tracer(struct tracer *type); 689 int is_tracing_stopped(void); 690 691 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 692 693 extern cpumask_var_t __read_mostly tracing_buffer_mask; 694 695 #define for_each_tracing_cpu(cpu) \ 696 for_each_cpu(cpu, tracing_buffer_mask) 697 698 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 699 700 extern unsigned long tracing_thresh; 701 702 /* PID filtering */ 703 704 extern int pid_max; 705 706 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 707 pid_t search_pid); 708 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 709 struct task_struct *task); 710 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 711 struct task_struct *self, 712 struct task_struct *task); 713 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 714 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 715 int trace_pid_show(struct seq_file *m, void *v); 716 void trace_free_pid_list(struct trace_pid_list *pid_list); 717 int trace_pid_write(struct trace_pid_list *filtered_pids, 718 struct trace_pid_list **new_pid_list, 719 const char __user *ubuf, size_t cnt); 720 721 #ifdef CONFIG_TRACER_MAX_TRACE 722 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 723 void update_max_tr_single(struct trace_array *tr, 724 struct task_struct *tsk, int cpu); 725 #endif /* CONFIG_TRACER_MAX_TRACE */ 726 727 #ifdef CONFIG_STACKTRACE 728 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 729 int pc); 730 731 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 732 int pc); 733 #else 734 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 735 unsigned long flags, int pc) 736 { 737 } 738 739 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 740 int skip, int pc) 741 { 742 } 743 #endif /* CONFIG_STACKTRACE */ 744 745 extern u64 ftrace_now(int cpu); 746 747 extern void trace_find_cmdline(int pid, char comm[]); 748 extern int trace_find_tgid(int pid); 749 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 750 751 #ifdef CONFIG_DYNAMIC_FTRACE 752 extern unsigned long ftrace_update_tot_cnt; 753 void ftrace_init_trace_array(struct trace_array *tr); 754 #else 755 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 756 #endif 757 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 758 extern int DYN_FTRACE_TEST_NAME(void); 759 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 760 extern int DYN_FTRACE_TEST_NAME2(void); 761 762 extern bool ring_buffer_expanded; 763 extern bool tracing_selftest_disabled; 764 765 #ifdef CONFIG_FTRACE_STARTUP_TEST 766 extern int trace_selftest_startup_function(struct tracer *trace, 767 struct trace_array *tr); 768 extern int trace_selftest_startup_function_graph(struct tracer *trace, 769 struct trace_array *tr); 770 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 771 struct trace_array *tr); 772 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 773 struct trace_array *tr); 774 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 775 struct trace_array *tr); 776 extern int trace_selftest_startup_wakeup(struct tracer *trace, 777 struct trace_array *tr); 778 extern int trace_selftest_startup_nop(struct tracer *trace, 779 struct trace_array *tr); 780 extern int trace_selftest_startup_branch(struct tracer *trace, 781 struct trace_array *tr); 782 /* 783 * Tracer data references selftest functions that only occur 784 * on boot up. These can be __init functions. Thus, when selftests 785 * are enabled, then the tracers need to reference __init functions. 786 */ 787 #define __tracer_data __refdata 788 #else 789 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 790 #define __tracer_data __read_mostly 791 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 792 793 extern void *head_page(struct trace_array_cpu *data); 794 extern unsigned long long ns2usecs(u64 nsec); 795 extern int 796 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 797 extern int 798 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 799 extern int 800 trace_array_vprintk(struct trace_array *tr, 801 unsigned long ip, const char *fmt, va_list args); 802 int trace_array_printk(struct trace_array *tr, 803 unsigned long ip, const char *fmt, ...); 804 int trace_array_printk_buf(struct ring_buffer *buffer, 805 unsigned long ip, const char *fmt, ...); 806 void trace_printk_seq(struct trace_seq *s); 807 enum print_line_t print_trace_line(struct trace_iterator *iter); 808 809 extern char trace_find_mark(unsigned long long duration); 810 811 struct ftrace_hash; 812 813 struct ftrace_mod_load { 814 struct list_head list; 815 char *func; 816 char *module; 817 int enable; 818 }; 819 820 enum { 821 FTRACE_HASH_FL_MOD = (1 << 0), 822 }; 823 824 struct ftrace_hash { 825 unsigned long size_bits; 826 struct hlist_head *buckets; 827 unsigned long count; 828 unsigned long flags; 829 struct rcu_head rcu; 830 }; 831 832 struct ftrace_func_entry * 833 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 834 835 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 836 { 837 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 838 } 839 840 /* Standard output formatting function used for function return traces */ 841 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 842 843 /* Flag options */ 844 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 845 #define TRACE_GRAPH_PRINT_CPU 0x2 846 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 847 #define TRACE_GRAPH_PRINT_PROC 0x8 848 #define TRACE_GRAPH_PRINT_DURATION 0x10 849 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 850 #define TRACE_GRAPH_PRINT_IRQS 0x40 851 #define TRACE_GRAPH_PRINT_TAIL 0x80 852 #define TRACE_GRAPH_SLEEP_TIME 0x100 853 #define TRACE_GRAPH_GRAPH_TIME 0x200 854 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 855 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 856 857 extern void ftrace_graph_sleep_time_control(bool enable); 858 extern void ftrace_graph_graph_time_control(bool enable); 859 860 extern enum print_line_t 861 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 862 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 863 extern void 864 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 865 extern void graph_trace_open(struct trace_iterator *iter); 866 extern void graph_trace_close(struct trace_iterator *iter); 867 extern int __trace_graph_entry(struct trace_array *tr, 868 struct ftrace_graph_ent *trace, 869 unsigned long flags, int pc); 870 extern void __trace_graph_return(struct trace_array *tr, 871 struct ftrace_graph_ret *trace, 872 unsigned long flags, int pc); 873 874 #ifdef CONFIG_DYNAMIC_FTRACE 875 extern struct ftrace_hash *ftrace_graph_hash; 876 extern struct ftrace_hash *ftrace_graph_notrace_hash; 877 878 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 879 { 880 unsigned long addr = trace->func; 881 int ret = 0; 882 883 preempt_disable_notrace(); 884 885 if (ftrace_hash_empty(ftrace_graph_hash)) { 886 ret = 1; 887 goto out; 888 } 889 890 if (ftrace_lookup_ip(ftrace_graph_hash, addr)) { 891 892 /* 893 * This needs to be cleared on the return functions 894 * when the depth is zero. 895 */ 896 trace_recursion_set(TRACE_GRAPH_BIT); 897 trace_recursion_set_depth(trace->depth); 898 899 /* 900 * If no irqs are to be traced, but a set_graph_function 901 * is set, and called by an interrupt handler, we still 902 * want to trace it. 903 */ 904 if (in_irq()) 905 trace_recursion_set(TRACE_IRQ_BIT); 906 else 907 trace_recursion_clear(TRACE_IRQ_BIT); 908 ret = 1; 909 } 910 911 out: 912 preempt_enable_notrace(); 913 return ret; 914 } 915 916 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 917 { 918 if (trace_recursion_test(TRACE_GRAPH_BIT) && 919 trace->depth == trace_recursion_depth()) 920 trace_recursion_clear(TRACE_GRAPH_BIT); 921 } 922 923 static inline int ftrace_graph_notrace_addr(unsigned long addr) 924 { 925 int ret = 0; 926 927 preempt_disable_notrace(); 928 929 if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr)) 930 ret = 1; 931 932 preempt_enable_notrace(); 933 return ret; 934 } 935 #else 936 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 937 { 938 return 1; 939 } 940 941 static inline int ftrace_graph_notrace_addr(unsigned long addr) 942 { 943 return 0; 944 } 945 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 946 { } 947 #endif /* CONFIG_DYNAMIC_FTRACE */ 948 949 extern unsigned int fgraph_max_depth; 950 951 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 952 { 953 /* trace it when it is-nested-in or is a function enabled. */ 954 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 955 ftrace_graph_addr(trace)) || 956 (trace->depth < 0) || 957 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 958 } 959 960 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 961 static inline enum print_line_t 962 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 963 { 964 return TRACE_TYPE_UNHANDLED; 965 } 966 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 967 968 extern struct list_head ftrace_pids; 969 970 #ifdef CONFIG_FUNCTION_TRACER 971 struct ftrace_func_command { 972 struct list_head list; 973 char *name; 974 int (*func)(struct trace_array *tr, 975 struct ftrace_hash *hash, 976 char *func, char *cmd, 977 char *params, int enable); 978 }; 979 extern bool ftrace_filter_param __initdata; 980 static inline int ftrace_trace_task(struct trace_array *tr) 981 { 982 return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid); 983 } 984 extern int ftrace_is_dead(void); 985 int ftrace_create_function_files(struct trace_array *tr, 986 struct dentry *parent); 987 void ftrace_destroy_function_files(struct trace_array *tr); 988 void ftrace_init_global_array_ops(struct trace_array *tr); 989 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 990 void ftrace_reset_array_ops(struct trace_array *tr); 991 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 992 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 993 struct dentry *d_tracer); 994 void ftrace_clear_pids(struct trace_array *tr); 995 int init_function_trace(void); 996 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 997 #else 998 static inline int ftrace_trace_task(struct trace_array *tr) 999 { 1000 return 1; 1001 } 1002 static inline int ftrace_is_dead(void) { return 0; } 1003 static inline int 1004 ftrace_create_function_files(struct trace_array *tr, 1005 struct dentry *parent) 1006 { 1007 return 0; 1008 } 1009 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1010 static inline __init void 1011 ftrace_init_global_array_ops(struct trace_array *tr) { } 1012 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1013 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1014 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1015 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1016 static inline int init_function_trace(void) { return 0; } 1017 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1018 /* ftace_func_t type is not defined, use macro instead of static inline */ 1019 #define ftrace_init_array_ops(tr, func) do { } while (0) 1020 #endif /* CONFIG_FUNCTION_TRACER */ 1021 1022 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1023 1024 struct ftrace_probe_ops { 1025 void (*func)(unsigned long ip, 1026 unsigned long parent_ip, 1027 struct trace_array *tr, 1028 struct ftrace_probe_ops *ops, 1029 void *data); 1030 int (*init)(struct ftrace_probe_ops *ops, 1031 struct trace_array *tr, 1032 unsigned long ip, void *init_data, 1033 void **data); 1034 void (*free)(struct ftrace_probe_ops *ops, 1035 struct trace_array *tr, 1036 unsigned long ip, void *data); 1037 int (*print)(struct seq_file *m, 1038 unsigned long ip, 1039 struct ftrace_probe_ops *ops, 1040 void *data); 1041 }; 1042 1043 struct ftrace_func_mapper; 1044 typedef int (*ftrace_mapper_func)(void *data); 1045 1046 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1047 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1048 unsigned long ip); 1049 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1050 unsigned long ip, void *data); 1051 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1052 unsigned long ip); 1053 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1054 ftrace_mapper_func free_func); 1055 1056 extern int 1057 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1058 struct ftrace_probe_ops *ops, void *data); 1059 extern int 1060 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1061 struct ftrace_probe_ops *ops); 1062 extern void clear_ftrace_function_probes(struct trace_array *tr); 1063 1064 int register_ftrace_command(struct ftrace_func_command *cmd); 1065 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1066 1067 void ftrace_create_filter_files(struct ftrace_ops *ops, 1068 struct dentry *parent); 1069 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1070 #else 1071 struct ftrace_func_command; 1072 1073 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1074 { 1075 return -EINVAL; 1076 } 1077 static inline __init int unregister_ftrace_command(char *cmd_name) 1078 { 1079 return -EINVAL; 1080 } 1081 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1082 { 1083 } 1084 1085 /* 1086 * The ops parameter passed in is usually undefined. 1087 * This must be a macro. 1088 */ 1089 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1090 #define ftrace_destroy_filter_files(ops) do { } while (0) 1091 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1092 1093 bool ftrace_event_is_function(struct trace_event_call *call); 1094 1095 /* 1096 * struct trace_parser - servers for reading the user input separated by spaces 1097 * @cont: set if the input is not complete - no final space char was found 1098 * @buffer: holds the parsed user input 1099 * @idx: user input length 1100 * @size: buffer size 1101 */ 1102 struct trace_parser { 1103 bool cont; 1104 char *buffer; 1105 unsigned idx; 1106 unsigned size; 1107 }; 1108 1109 static inline bool trace_parser_loaded(struct trace_parser *parser) 1110 { 1111 return (parser->idx != 0); 1112 } 1113 1114 static inline bool trace_parser_cont(struct trace_parser *parser) 1115 { 1116 return parser->cont; 1117 } 1118 1119 static inline void trace_parser_clear(struct trace_parser *parser) 1120 { 1121 parser->cont = false; 1122 parser->idx = 0; 1123 } 1124 1125 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1126 extern void trace_parser_put(struct trace_parser *parser); 1127 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1128 size_t cnt, loff_t *ppos); 1129 1130 /* 1131 * Only create function graph options if function graph is configured. 1132 */ 1133 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1134 # define FGRAPH_FLAGS \ 1135 C(DISPLAY_GRAPH, "display-graph"), 1136 #else 1137 # define FGRAPH_FLAGS 1138 #endif 1139 1140 #ifdef CONFIG_BRANCH_TRACER 1141 # define BRANCH_FLAGS \ 1142 C(BRANCH, "branch"), 1143 #else 1144 # define BRANCH_FLAGS 1145 #endif 1146 1147 #ifdef CONFIG_FUNCTION_TRACER 1148 # define FUNCTION_FLAGS \ 1149 C(FUNCTION, "function-trace"), \ 1150 C(FUNC_FORK, "function-fork"), 1151 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1152 #else 1153 # define FUNCTION_FLAGS 1154 # define FUNCTION_DEFAULT_FLAGS 0UL 1155 # define TRACE_ITER_FUNC_FORK 0UL 1156 #endif 1157 1158 #ifdef CONFIG_STACKTRACE 1159 # define STACK_FLAGS \ 1160 C(STACKTRACE, "stacktrace"), 1161 #else 1162 # define STACK_FLAGS 1163 #endif 1164 1165 /* 1166 * trace_iterator_flags is an enumeration that defines bit 1167 * positions into trace_flags that controls the output. 1168 * 1169 * NOTE: These bits must match the trace_options array in 1170 * trace.c (this macro guarantees it). 1171 */ 1172 #define TRACE_FLAGS \ 1173 C(PRINT_PARENT, "print-parent"), \ 1174 C(SYM_OFFSET, "sym-offset"), \ 1175 C(SYM_ADDR, "sym-addr"), \ 1176 C(VERBOSE, "verbose"), \ 1177 C(RAW, "raw"), \ 1178 C(HEX, "hex"), \ 1179 C(BIN, "bin"), \ 1180 C(BLOCK, "block"), \ 1181 C(PRINTK, "trace_printk"), \ 1182 C(ANNOTATE, "annotate"), \ 1183 C(USERSTACKTRACE, "userstacktrace"), \ 1184 C(SYM_USEROBJ, "sym-userobj"), \ 1185 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1186 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1187 C(LATENCY_FMT, "latency-format"), \ 1188 C(RECORD_CMD, "record-cmd"), \ 1189 C(RECORD_TGID, "record-tgid"), \ 1190 C(OVERWRITE, "overwrite"), \ 1191 C(STOP_ON_FREE, "disable_on_free"), \ 1192 C(IRQ_INFO, "irq-info"), \ 1193 C(MARKERS, "markers"), \ 1194 C(EVENT_FORK, "event-fork"), \ 1195 FUNCTION_FLAGS \ 1196 FGRAPH_FLAGS \ 1197 STACK_FLAGS \ 1198 BRANCH_FLAGS 1199 1200 /* 1201 * By defining C, we can make TRACE_FLAGS a list of bit names 1202 * that will define the bits for the flag masks. 1203 */ 1204 #undef C 1205 #define C(a, b) TRACE_ITER_##a##_BIT 1206 1207 enum trace_iterator_bits { 1208 TRACE_FLAGS 1209 /* Make sure we don't go more than we have bits for */ 1210 TRACE_ITER_LAST_BIT 1211 }; 1212 1213 /* 1214 * By redefining C, we can make TRACE_FLAGS a list of masks that 1215 * use the bits as defined above. 1216 */ 1217 #undef C 1218 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1219 1220 enum trace_iterator_flags { TRACE_FLAGS }; 1221 1222 /* 1223 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1224 * control the output of kernel symbols. 1225 */ 1226 #define TRACE_ITER_SYM_MASK \ 1227 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1228 1229 extern struct tracer nop_trace; 1230 1231 #ifdef CONFIG_BRANCH_TRACER 1232 extern int enable_branch_tracing(struct trace_array *tr); 1233 extern void disable_branch_tracing(void); 1234 static inline int trace_branch_enable(struct trace_array *tr) 1235 { 1236 if (tr->trace_flags & TRACE_ITER_BRANCH) 1237 return enable_branch_tracing(tr); 1238 return 0; 1239 } 1240 static inline void trace_branch_disable(void) 1241 { 1242 /* due to races, always disable */ 1243 disable_branch_tracing(); 1244 } 1245 #else 1246 static inline int trace_branch_enable(struct trace_array *tr) 1247 { 1248 return 0; 1249 } 1250 static inline void trace_branch_disable(void) 1251 { 1252 } 1253 #endif /* CONFIG_BRANCH_TRACER */ 1254 1255 /* set ring buffers to default size if not already done so */ 1256 int tracing_update_buffers(void); 1257 1258 struct ftrace_event_field { 1259 struct list_head link; 1260 const char *name; 1261 const char *type; 1262 int filter_type; 1263 int offset; 1264 int size; 1265 int is_signed; 1266 }; 1267 1268 struct prog_entry; 1269 1270 struct event_filter { 1271 struct prog_entry __rcu *prog; 1272 char *filter_string; 1273 }; 1274 1275 struct event_subsystem { 1276 struct list_head list; 1277 const char *name; 1278 struct event_filter *filter; 1279 int ref_count; 1280 }; 1281 1282 struct trace_subsystem_dir { 1283 struct list_head list; 1284 struct event_subsystem *subsystem; 1285 struct trace_array *tr; 1286 struct dentry *entry; 1287 int ref_count; 1288 int nr_events; 1289 }; 1290 1291 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1292 struct ring_buffer *buffer, 1293 struct ring_buffer_event *event); 1294 1295 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1296 struct ring_buffer *buffer, 1297 struct ring_buffer_event *event, 1298 unsigned long flags, int pc, 1299 struct pt_regs *regs); 1300 1301 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1302 struct ring_buffer *buffer, 1303 struct ring_buffer_event *event, 1304 unsigned long flags, int pc) 1305 { 1306 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL); 1307 } 1308 1309 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1310 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1311 void trace_buffered_event_disable(void); 1312 void trace_buffered_event_enable(void); 1313 1314 static inline void 1315 __trace_event_discard_commit(struct ring_buffer *buffer, 1316 struct ring_buffer_event *event) 1317 { 1318 if (this_cpu_read(trace_buffered_event) == event) { 1319 /* Simply release the temp buffer */ 1320 this_cpu_dec(trace_buffered_event_cnt); 1321 return; 1322 } 1323 ring_buffer_discard_commit(buffer, event); 1324 } 1325 1326 /* 1327 * Helper function for event_trigger_unlock_commit{_regs}(). 1328 * If there are event triggers attached to this event that requires 1329 * filtering against its fields, then they wil be called as the 1330 * entry already holds the field information of the current event. 1331 * 1332 * It also checks if the event should be discarded or not. 1333 * It is to be discarded if the event is soft disabled and the 1334 * event was only recorded to process triggers, or if the event 1335 * filter is active and this event did not match the filters. 1336 * 1337 * Returns true if the event is discarded, false otherwise. 1338 */ 1339 static inline bool 1340 __event_trigger_test_discard(struct trace_event_file *file, 1341 struct ring_buffer *buffer, 1342 struct ring_buffer_event *event, 1343 void *entry, 1344 enum event_trigger_type *tt) 1345 { 1346 unsigned long eflags = file->flags; 1347 1348 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1349 *tt = event_triggers_call(file, entry, event); 1350 1351 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || 1352 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && 1353 !filter_match_preds(file->filter, entry))) { 1354 __trace_event_discard_commit(buffer, event); 1355 return true; 1356 } 1357 1358 return false; 1359 } 1360 1361 /** 1362 * event_trigger_unlock_commit - handle triggers and finish event commit 1363 * @file: The file pointer assoctiated to the event 1364 * @buffer: The ring buffer that the event is being written to 1365 * @event: The event meta data in the ring buffer 1366 * @entry: The event itself 1367 * @irq_flags: The state of the interrupts at the start of the event 1368 * @pc: The state of the preempt count at the start of the event. 1369 * 1370 * This is a helper function to handle triggers that require data 1371 * from the event itself. It also tests the event against filters and 1372 * if the event is soft disabled and should be discarded. 1373 */ 1374 static inline void 1375 event_trigger_unlock_commit(struct trace_event_file *file, 1376 struct ring_buffer *buffer, 1377 struct ring_buffer_event *event, 1378 void *entry, unsigned long irq_flags, int pc) 1379 { 1380 enum event_trigger_type tt = ETT_NONE; 1381 1382 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1383 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc); 1384 1385 if (tt) 1386 event_triggers_post_call(file, tt); 1387 } 1388 1389 /** 1390 * event_trigger_unlock_commit_regs - handle triggers and finish event commit 1391 * @file: The file pointer assoctiated to the event 1392 * @buffer: The ring buffer that the event is being written to 1393 * @event: The event meta data in the ring buffer 1394 * @entry: The event itself 1395 * @irq_flags: The state of the interrupts at the start of the event 1396 * @pc: The state of the preempt count at the start of the event. 1397 * 1398 * This is a helper function to handle triggers that require data 1399 * from the event itself. It also tests the event against filters and 1400 * if the event is soft disabled and should be discarded. 1401 * 1402 * Same as event_trigger_unlock_commit() but calls 1403 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). 1404 */ 1405 static inline void 1406 event_trigger_unlock_commit_regs(struct trace_event_file *file, 1407 struct ring_buffer *buffer, 1408 struct ring_buffer_event *event, 1409 void *entry, unsigned long irq_flags, int pc, 1410 struct pt_regs *regs) 1411 { 1412 enum event_trigger_type tt = ETT_NONE; 1413 1414 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1415 trace_buffer_unlock_commit_regs(file->tr, buffer, event, 1416 irq_flags, pc, regs); 1417 1418 if (tt) 1419 event_triggers_post_call(file, tt); 1420 } 1421 1422 #define FILTER_PRED_INVALID ((unsigned short)-1) 1423 #define FILTER_PRED_IS_RIGHT (1 << 15) 1424 #define FILTER_PRED_FOLD (1 << 15) 1425 1426 /* 1427 * The max preds is the size of unsigned short with 1428 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1429 * and FOLD flags. The other is reserved. 1430 * 1431 * 2^14 preds is way more than enough. 1432 */ 1433 #define MAX_FILTER_PRED 16384 1434 1435 struct filter_pred; 1436 struct regex; 1437 1438 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1439 1440 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1441 1442 enum regex_type { 1443 MATCH_FULL = 0, 1444 MATCH_FRONT_ONLY, 1445 MATCH_MIDDLE_ONLY, 1446 MATCH_END_ONLY, 1447 MATCH_GLOB, 1448 }; 1449 1450 struct regex { 1451 char pattern[MAX_FILTER_STR_VAL]; 1452 int len; 1453 int field_len; 1454 regex_match_func match; 1455 }; 1456 1457 struct filter_pred { 1458 filter_pred_fn_t fn; 1459 u64 val; 1460 struct regex regex; 1461 unsigned short *ops; 1462 struct ftrace_event_field *field; 1463 int offset; 1464 int not; 1465 int op; 1466 }; 1467 1468 static inline bool is_string_field(struct ftrace_event_field *field) 1469 { 1470 return field->filter_type == FILTER_DYN_STRING || 1471 field->filter_type == FILTER_STATIC_STRING || 1472 field->filter_type == FILTER_PTR_STRING || 1473 field->filter_type == FILTER_COMM; 1474 } 1475 1476 static inline bool is_function_field(struct ftrace_event_field *field) 1477 { 1478 return field->filter_type == FILTER_TRACE_FN; 1479 } 1480 1481 extern enum regex_type 1482 filter_parse_regex(char *buff, int len, char **search, int *not); 1483 extern void print_event_filter(struct trace_event_file *file, 1484 struct trace_seq *s); 1485 extern int apply_event_filter(struct trace_event_file *file, 1486 char *filter_string); 1487 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1488 char *filter_string); 1489 extern void print_subsystem_event_filter(struct event_subsystem *system, 1490 struct trace_seq *s); 1491 extern int filter_assign_type(const char *type); 1492 extern int create_event_filter(struct trace_event_call *call, 1493 char *filter_str, bool set_str, 1494 struct event_filter **filterp); 1495 extern void free_event_filter(struct event_filter *filter); 1496 1497 struct ftrace_event_field * 1498 trace_find_event_field(struct trace_event_call *call, char *name); 1499 1500 extern void trace_event_enable_cmd_record(bool enable); 1501 extern void trace_event_enable_tgid_record(bool enable); 1502 1503 extern int event_trace_init(void); 1504 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1505 extern int event_trace_del_tracer(struct trace_array *tr); 1506 1507 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1508 const char *system, 1509 const char *event); 1510 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1511 const char *system, 1512 const char *event); 1513 1514 static inline void *event_file_data(struct file *filp) 1515 { 1516 return READ_ONCE(file_inode(filp)->i_private); 1517 } 1518 1519 extern struct mutex event_mutex; 1520 extern struct list_head ftrace_events; 1521 1522 extern const struct file_operations event_trigger_fops; 1523 extern const struct file_operations event_hist_fops; 1524 1525 #ifdef CONFIG_HIST_TRIGGERS 1526 extern int register_trigger_hist_cmd(void); 1527 extern int register_trigger_hist_enable_disable_cmds(void); 1528 #else 1529 static inline int register_trigger_hist_cmd(void) { return 0; } 1530 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1531 #endif 1532 1533 extern int register_trigger_cmds(void); 1534 extern void clear_event_triggers(struct trace_array *tr); 1535 1536 struct event_trigger_data { 1537 unsigned long count; 1538 int ref; 1539 struct event_trigger_ops *ops; 1540 struct event_command *cmd_ops; 1541 struct event_filter __rcu *filter; 1542 char *filter_str; 1543 void *private_data; 1544 bool paused; 1545 bool paused_tmp; 1546 struct list_head list; 1547 char *name; 1548 struct list_head named_list; 1549 struct event_trigger_data *named_data; 1550 }; 1551 1552 /* Avoid typos */ 1553 #define ENABLE_EVENT_STR "enable_event" 1554 #define DISABLE_EVENT_STR "disable_event" 1555 #define ENABLE_HIST_STR "enable_hist" 1556 #define DISABLE_HIST_STR "disable_hist" 1557 1558 struct enable_trigger_data { 1559 struct trace_event_file *file; 1560 bool enable; 1561 bool hist; 1562 }; 1563 1564 extern int event_enable_trigger_print(struct seq_file *m, 1565 struct event_trigger_ops *ops, 1566 struct event_trigger_data *data); 1567 extern void event_enable_trigger_free(struct event_trigger_ops *ops, 1568 struct event_trigger_data *data); 1569 extern int event_enable_trigger_func(struct event_command *cmd_ops, 1570 struct trace_event_file *file, 1571 char *glob, char *cmd, char *param); 1572 extern int event_enable_register_trigger(char *glob, 1573 struct event_trigger_ops *ops, 1574 struct event_trigger_data *data, 1575 struct trace_event_file *file); 1576 extern void event_enable_unregister_trigger(char *glob, 1577 struct event_trigger_ops *ops, 1578 struct event_trigger_data *test, 1579 struct trace_event_file *file); 1580 extern void trigger_data_free(struct event_trigger_data *data); 1581 extern int event_trigger_init(struct event_trigger_ops *ops, 1582 struct event_trigger_data *data); 1583 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1584 int trigger_enable); 1585 extern void update_cond_flag(struct trace_event_file *file); 1586 extern int set_trigger_filter(char *filter_str, 1587 struct event_trigger_data *trigger_data, 1588 struct trace_event_file *file); 1589 extern struct event_trigger_data *find_named_trigger(const char *name); 1590 extern bool is_named_trigger(struct event_trigger_data *test); 1591 extern int save_named_trigger(const char *name, 1592 struct event_trigger_data *data); 1593 extern void del_named_trigger(struct event_trigger_data *data); 1594 extern void pause_named_trigger(struct event_trigger_data *data); 1595 extern void unpause_named_trigger(struct event_trigger_data *data); 1596 extern void set_named_trigger_data(struct event_trigger_data *data, 1597 struct event_trigger_data *named_data); 1598 extern struct event_trigger_data * 1599 get_named_trigger_data(struct event_trigger_data *data); 1600 extern int register_event_command(struct event_command *cmd); 1601 extern int unregister_event_command(struct event_command *cmd); 1602 extern int register_trigger_hist_enable_disable_cmds(void); 1603 1604 /** 1605 * struct event_trigger_ops - callbacks for trace event triggers 1606 * 1607 * The methods in this structure provide per-event trigger hooks for 1608 * various trigger operations. 1609 * 1610 * All the methods below, except for @init() and @free(), must be 1611 * implemented. 1612 * 1613 * @func: The trigger 'probe' function called when the triggering 1614 * event occurs. The data passed into this callback is the data 1615 * that was supplied to the event_command @reg() function that 1616 * registered the trigger (see struct event_command) along with 1617 * the trace record, rec. 1618 * 1619 * @init: An optional initialization function called for the trigger 1620 * when the trigger is registered (via the event_command reg() 1621 * function). This can be used to perform per-trigger 1622 * initialization such as incrementing a per-trigger reference 1623 * count, for instance. This is usually implemented by the 1624 * generic utility function @event_trigger_init() (see 1625 * trace_event_triggers.c). 1626 * 1627 * @free: An optional de-initialization function called for the 1628 * trigger when the trigger is unregistered (via the 1629 * event_command @reg() function). This can be used to perform 1630 * per-trigger de-initialization such as decrementing a 1631 * per-trigger reference count and freeing corresponding trigger 1632 * data, for instance. This is usually implemented by the 1633 * generic utility function @event_trigger_free() (see 1634 * trace_event_triggers.c). 1635 * 1636 * @print: The callback function invoked to have the trigger print 1637 * itself. This is usually implemented by a wrapper function 1638 * that calls the generic utility function @event_trigger_print() 1639 * (see trace_event_triggers.c). 1640 */ 1641 struct event_trigger_ops { 1642 void (*func)(struct event_trigger_data *data, 1643 void *rec, 1644 struct ring_buffer_event *rbe); 1645 int (*init)(struct event_trigger_ops *ops, 1646 struct event_trigger_data *data); 1647 void (*free)(struct event_trigger_ops *ops, 1648 struct event_trigger_data *data); 1649 int (*print)(struct seq_file *m, 1650 struct event_trigger_ops *ops, 1651 struct event_trigger_data *data); 1652 }; 1653 1654 /** 1655 * struct event_command - callbacks and data members for event commands 1656 * 1657 * Event commands are invoked by users by writing the command name 1658 * into the 'trigger' file associated with a trace event. The 1659 * parameters associated with a specific invocation of an event 1660 * command are used to create an event trigger instance, which is 1661 * added to the list of trigger instances associated with that trace 1662 * event. When the event is hit, the set of triggers associated with 1663 * that event is invoked. 1664 * 1665 * The data members in this structure provide per-event command data 1666 * for various event commands. 1667 * 1668 * All the data members below, except for @post_trigger, must be set 1669 * for each event command. 1670 * 1671 * @name: The unique name that identifies the event command. This is 1672 * the name used when setting triggers via trigger files. 1673 * 1674 * @trigger_type: A unique id that identifies the event command 1675 * 'type'. This value has two purposes, the first to ensure that 1676 * only one trigger of the same type can be set at a given time 1677 * for a particular event e.g. it doesn't make sense to have both 1678 * a traceon and traceoff trigger attached to a single event at 1679 * the same time, so traceon and traceoff have the same type 1680 * though they have different names. The @trigger_type value is 1681 * also used as a bit value for deferring the actual trigger 1682 * action until after the current event is finished. Some 1683 * commands need to do this if they themselves log to the trace 1684 * buffer (see the @post_trigger() member below). @trigger_type 1685 * values are defined by adding new values to the trigger_type 1686 * enum in include/linux/trace_events.h. 1687 * 1688 * @flags: See the enum event_command_flags below. 1689 * 1690 * All the methods below, except for @set_filter() and @unreg_all(), 1691 * must be implemented. 1692 * 1693 * @func: The callback function responsible for parsing and 1694 * registering the trigger written to the 'trigger' file by the 1695 * user. It allocates the trigger instance and registers it with 1696 * the appropriate trace event. It makes use of the other 1697 * event_command callback functions to orchestrate this, and is 1698 * usually implemented by the generic utility function 1699 * @event_trigger_callback() (see trace_event_triggers.c). 1700 * 1701 * @reg: Adds the trigger to the list of triggers associated with the 1702 * event, and enables the event trigger itself, after 1703 * initializing it (via the event_trigger_ops @init() function). 1704 * This is also where commands can use the @trigger_type value to 1705 * make the decision as to whether or not multiple instances of 1706 * the trigger should be allowed. This is usually implemented by 1707 * the generic utility function @register_trigger() (see 1708 * trace_event_triggers.c). 1709 * 1710 * @unreg: Removes the trigger from the list of triggers associated 1711 * with the event, and disables the event trigger itself, after 1712 * initializing it (via the event_trigger_ops @free() function). 1713 * This is usually implemented by the generic utility function 1714 * @unregister_trigger() (see trace_event_triggers.c). 1715 * 1716 * @unreg_all: An optional function called to remove all the triggers 1717 * from the list of triggers associated with the event. Called 1718 * when a trigger file is opened in truncate mode. 1719 * 1720 * @set_filter: An optional function called to parse and set a filter 1721 * for the trigger. If no @set_filter() method is set for the 1722 * event command, filters set by the user for the command will be 1723 * ignored. This is usually implemented by the generic utility 1724 * function @set_trigger_filter() (see trace_event_triggers.c). 1725 * 1726 * @get_trigger_ops: The callback function invoked to retrieve the 1727 * event_trigger_ops implementation associated with the command. 1728 */ 1729 struct event_command { 1730 struct list_head list; 1731 char *name; 1732 enum event_trigger_type trigger_type; 1733 int flags; 1734 int (*func)(struct event_command *cmd_ops, 1735 struct trace_event_file *file, 1736 char *glob, char *cmd, char *params); 1737 int (*reg)(char *glob, 1738 struct event_trigger_ops *ops, 1739 struct event_trigger_data *data, 1740 struct trace_event_file *file); 1741 void (*unreg)(char *glob, 1742 struct event_trigger_ops *ops, 1743 struct event_trigger_data *data, 1744 struct trace_event_file *file); 1745 void (*unreg_all)(struct trace_event_file *file); 1746 int (*set_filter)(char *filter_str, 1747 struct event_trigger_data *data, 1748 struct trace_event_file *file); 1749 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1750 }; 1751 1752 /** 1753 * enum event_command_flags - flags for struct event_command 1754 * 1755 * @POST_TRIGGER: A flag that says whether or not this command needs 1756 * to have its action delayed until after the current event has 1757 * been closed. Some triggers need to avoid being invoked while 1758 * an event is currently in the process of being logged, since 1759 * the trigger may itself log data into the trace buffer. Thus 1760 * we make sure the current event is committed before invoking 1761 * those triggers. To do that, the trigger invocation is split 1762 * in two - the first part checks the filter using the current 1763 * trace record; if a command has the @post_trigger flag set, it 1764 * sets a bit for itself in the return value, otherwise it 1765 * directly invokes the trigger. Once all commands have been 1766 * either invoked or set their return flag, the current record is 1767 * either committed or discarded. At that point, if any commands 1768 * have deferred their triggers, those commands are finally 1769 * invoked following the close of the current event. In other 1770 * words, if the event_trigger_ops @func() probe implementation 1771 * itself logs to the trace buffer, this flag should be set, 1772 * otherwise it can be left unspecified. 1773 * 1774 * @NEEDS_REC: A flag that says whether or not this command needs 1775 * access to the trace record in order to perform its function, 1776 * regardless of whether or not it has a filter associated with 1777 * it (filters make a trigger require access to the trace record 1778 * but are not always present). 1779 */ 1780 enum event_command_flags { 1781 EVENT_CMD_FL_POST_TRIGGER = 1, 1782 EVENT_CMD_FL_NEEDS_REC = 2, 1783 }; 1784 1785 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1786 { 1787 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1788 } 1789 1790 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1791 { 1792 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1793 } 1794 1795 extern int trace_event_enable_disable(struct trace_event_file *file, 1796 int enable, int soft_disable); 1797 extern int tracing_alloc_snapshot(void); 1798 1799 extern const char *__start___trace_bprintk_fmt[]; 1800 extern const char *__stop___trace_bprintk_fmt[]; 1801 1802 extern const char *__start___tracepoint_str[]; 1803 extern const char *__stop___tracepoint_str[]; 1804 1805 void trace_printk_control(bool enabled); 1806 void trace_printk_init_buffers(void); 1807 void trace_printk_start_comm(void); 1808 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1809 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1810 1811 #define MAX_EVENT_NAME_LEN 64 1812 1813 extern int trace_run_command(const char *buf, int (*createfn)(int, char**)); 1814 extern ssize_t trace_parse_run_command(struct file *file, 1815 const char __user *buffer, size_t count, loff_t *ppos, 1816 int (*createfn)(int, char**)); 1817 1818 /* 1819 * Normal trace_printk() and friends allocates special buffers 1820 * to do the manipulation, as well as saves the print formats 1821 * into sections to display. But the trace infrastructure wants 1822 * to use these without the added overhead at the price of being 1823 * a bit slower (used mainly for warnings, where we don't care 1824 * about performance). The internal_trace_puts() is for such 1825 * a purpose. 1826 */ 1827 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1828 1829 #undef FTRACE_ENTRY 1830 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1831 extern struct trace_event_call \ 1832 __aligned(4) event_##call; 1833 #undef FTRACE_ENTRY_DUP 1834 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1835 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1836 filter) 1837 #undef FTRACE_ENTRY_PACKED 1838 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \ 1839 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1840 filter) 1841 1842 #include "trace_entries.h" 1843 1844 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1845 int perf_ftrace_event_register(struct trace_event_call *call, 1846 enum trace_reg type, void *data); 1847 #else 1848 #define perf_ftrace_event_register NULL 1849 #endif 1850 1851 #ifdef CONFIG_FTRACE_SYSCALLS 1852 void init_ftrace_syscalls(void); 1853 const char *get_syscall_name(int syscall); 1854 #else 1855 static inline void init_ftrace_syscalls(void) { } 1856 static inline const char *get_syscall_name(int syscall) 1857 { 1858 return NULL; 1859 } 1860 #endif 1861 1862 #ifdef CONFIG_EVENT_TRACING 1863 void trace_event_init(void); 1864 void trace_event_eval_update(struct trace_eval_map **map, int len); 1865 #else 1866 static inline void __init trace_event_init(void) { } 1867 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1868 #endif 1869 1870 #ifdef CONFIG_TRACER_SNAPSHOT 1871 void tracing_snapshot_instance(struct trace_array *tr); 1872 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1873 #else 1874 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1875 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1876 { 1877 return 0; 1878 } 1879 #endif 1880 1881 #ifdef CONFIG_PREEMPT_TRACER 1882 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1883 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1884 #else 1885 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1886 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1887 #endif 1888 #ifdef CONFIG_IRQSOFF_TRACER 1889 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1890 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1891 #else 1892 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1893 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1894 #endif 1895 1896 extern struct trace_iterator *tracepoint_print_iter; 1897 1898 #endif /* _LINUX_KERNEL_TRACE_H */ 1899