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 int buffer_percent; 251 struct tracer *current_trace; 252 unsigned int trace_flags; 253 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 254 unsigned int flags; 255 raw_spinlock_t start_lock; 256 struct dentry *dir; 257 struct dentry *options; 258 struct dentry *percpu_dir; 259 struct dentry *event_dir; 260 struct trace_options *topts; 261 struct list_head systems; 262 struct list_head events; 263 struct trace_event_file *trace_marker_file; 264 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 265 int ref; 266 #ifdef CONFIG_FUNCTION_TRACER 267 struct ftrace_ops *ops; 268 struct trace_pid_list __rcu *function_pids; 269 #ifdef CONFIG_DYNAMIC_FTRACE 270 /* All of these are protected by the ftrace_lock */ 271 struct list_head func_probes; 272 struct list_head mod_trace; 273 struct list_head mod_notrace; 274 #endif 275 /* function tracing enabled */ 276 int function_enabled; 277 #endif 278 int time_stamp_abs_ref; 279 struct list_head hist_vars; 280 }; 281 282 enum { 283 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 284 }; 285 286 extern struct list_head ftrace_trace_arrays; 287 288 extern struct mutex trace_types_lock; 289 290 extern int trace_array_get(struct trace_array *tr); 291 extern void trace_array_put(struct trace_array *tr); 292 293 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs); 294 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 295 296 extern bool trace_clock_in_ns(struct trace_array *tr); 297 298 /* 299 * The global tracer (top) should be the first trace array added, 300 * but we check the flag anyway. 301 */ 302 static inline struct trace_array *top_trace_array(void) 303 { 304 struct trace_array *tr; 305 306 if (list_empty(&ftrace_trace_arrays)) 307 return NULL; 308 309 tr = list_entry(ftrace_trace_arrays.prev, 310 typeof(*tr), list); 311 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 312 return tr; 313 } 314 315 #define FTRACE_CMP_TYPE(var, type) \ 316 __builtin_types_compatible_p(typeof(var), type *) 317 318 #undef IF_ASSIGN 319 #define IF_ASSIGN(var, entry, etype, id) \ 320 if (FTRACE_CMP_TYPE(var, etype)) { \ 321 var = (typeof(var))(entry); \ 322 WARN_ON(id && (entry)->type != id); \ 323 break; \ 324 } 325 326 /* Will cause compile errors if type is not found. */ 327 extern void __ftrace_bad_type(void); 328 329 /* 330 * The trace_assign_type is a verifier that the entry type is 331 * the same as the type being assigned. To add new types simply 332 * add a line with the following format: 333 * 334 * IF_ASSIGN(var, ent, type, id); 335 * 336 * Where "type" is the trace type that includes the trace_entry 337 * as the "ent" item. And "id" is the trace identifier that is 338 * used in the trace_type enum. 339 * 340 * If the type can have more than one id, then use zero. 341 */ 342 #define trace_assign_type(var, ent) \ 343 do { \ 344 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 345 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 346 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 347 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 348 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 349 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 350 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 351 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 352 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 353 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 354 TRACE_MMIO_RW); \ 355 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 356 TRACE_MMIO_MAP); \ 357 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 358 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 359 TRACE_GRAPH_ENT); \ 360 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 361 TRACE_GRAPH_RET); \ 362 __ftrace_bad_type(); \ 363 } while (0) 364 365 /* 366 * An option specific to a tracer. This is a boolean value. 367 * The bit is the bit index that sets its value on the 368 * flags value in struct tracer_flags. 369 */ 370 struct tracer_opt { 371 const char *name; /* Will appear on the trace_options file */ 372 u32 bit; /* Mask assigned in val field in tracer_flags */ 373 }; 374 375 /* 376 * The set of specific options for a tracer. Your tracer 377 * have to set the initial value of the flags val. 378 */ 379 struct tracer_flags { 380 u32 val; 381 struct tracer_opt *opts; 382 struct tracer *trace; 383 }; 384 385 /* Makes more easy to define a tracer opt */ 386 #define TRACER_OPT(s, b) .name = #s, .bit = b 387 388 389 struct trace_option_dentry { 390 struct tracer_opt *opt; 391 struct tracer_flags *flags; 392 struct trace_array *tr; 393 struct dentry *entry; 394 }; 395 396 /** 397 * struct tracer - a specific tracer and its callbacks to interact with tracefs 398 * @name: the name chosen to select it on the available_tracers file 399 * @init: called when one switches to this tracer (echo name > current_tracer) 400 * @reset: called when one switches to another tracer 401 * @start: called when tracing is unpaused (echo 1 > tracing_on) 402 * @stop: called when tracing is paused (echo 0 > tracing_on) 403 * @update_thresh: called when tracing_thresh is updated 404 * @open: called when the trace file is opened 405 * @pipe_open: called when the trace_pipe file is opened 406 * @close: called when the trace file is released 407 * @pipe_close: called when the trace_pipe file is released 408 * @read: override the default read callback on trace_pipe 409 * @splice_read: override the default splice_read callback on trace_pipe 410 * @selftest: selftest to run on boot (see trace_selftest.c) 411 * @print_headers: override the first lines that describe your columns 412 * @print_line: callback that prints a trace 413 * @set_flag: signals one of your private flags changed (trace_options file) 414 * @flags: your private flags 415 */ 416 struct tracer { 417 const char *name; 418 int (*init)(struct trace_array *tr); 419 void (*reset)(struct trace_array *tr); 420 void (*start)(struct trace_array *tr); 421 void (*stop)(struct trace_array *tr); 422 int (*update_thresh)(struct trace_array *tr); 423 void (*open)(struct trace_iterator *iter); 424 void (*pipe_open)(struct trace_iterator *iter); 425 void (*close)(struct trace_iterator *iter); 426 void (*pipe_close)(struct trace_iterator *iter); 427 ssize_t (*read)(struct trace_iterator *iter, 428 struct file *filp, char __user *ubuf, 429 size_t cnt, loff_t *ppos); 430 ssize_t (*splice_read)(struct trace_iterator *iter, 431 struct file *filp, 432 loff_t *ppos, 433 struct pipe_inode_info *pipe, 434 size_t len, 435 unsigned int flags); 436 #ifdef CONFIG_FTRACE_STARTUP_TEST 437 int (*selftest)(struct tracer *trace, 438 struct trace_array *tr); 439 #endif 440 void (*print_header)(struct seq_file *m); 441 enum print_line_t (*print_line)(struct trace_iterator *iter); 442 /* If you handled the flag setting, return 0 */ 443 int (*set_flag)(struct trace_array *tr, 444 u32 old_flags, u32 bit, int set); 445 /* Return 0 if OK with change, else return non-zero */ 446 int (*flag_changed)(struct trace_array *tr, 447 u32 mask, int set); 448 struct tracer *next; 449 struct tracer_flags *flags; 450 int enabled; 451 int ref; 452 bool print_max; 453 bool allow_instances; 454 #ifdef CONFIG_TRACER_MAX_TRACE 455 bool use_max_tr; 456 #endif 457 /* True if tracer cannot be enabled in kernel param */ 458 bool noboot; 459 }; 460 461 462 /* Only current can touch trace_recursion */ 463 464 /* 465 * For function tracing recursion: 466 * The order of these bits are important. 467 * 468 * When function tracing occurs, the following steps are made: 469 * If arch does not support a ftrace feature: 470 * call internal function (uses INTERNAL bits) which calls... 471 * If callback is registered to the "global" list, the list 472 * function is called and recursion checks the GLOBAL bits. 473 * then this function calls... 474 * The function callback, which can use the FTRACE bits to 475 * check for recursion. 476 * 477 * Now if the arch does not suppport a feature, and it calls 478 * the global list function which calls the ftrace callback 479 * all three of these steps will do a recursion protection. 480 * There's no reason to do one if the previous caller already 481 * did. The recursion that we are protecting against will 482 * go through the same steps again. 483 * 484 * To prevent the multiple recursion checks, if a recursion 485 * bit is set that is higher than the MAX bit of the current 486 * check, then we know that the check was made by the previous 487 * caller, and we can skip the current check. 488 */ 489 enum { 490 TRACE_BUFFER_BIT, 491 TRACE_BUFFER_NMI_BIT, 492 TRACE_BUFFER_IRQ_BIT, 493 TRACE_BUFFER_SIRQ_BIT, 494 495 /* Start of function recursion bits */ 496 TRACE_FTRACE_BIT, 497 TRACE_FTRACE_NMI_BIT, 498 TRACE_FTRACE_IRQ_BIT, 499 TRACE_FTRACE_SIRQ_BIT, 500 501 /* INTERNAL_BITs must be greater than FTRACE_BITs */ 502 TRACE_INTERNAL_BIT, 503 TRACE_INTERNAL_NMI_BIT, 504 TRACE_INTERNAL_IRQ_BIT, 505 TRACE_INTERNAL_SIRQ_BIT, 506 507 TRACE_BRANCH_BIT, 508 /* 509 * Abuse of the trace_recursion. 510 * As we need a way to maintain state if we are tracing the function 511 * graph in irq because we want to trace a particular function that 512 * was called in irq context but we have irq tracing off. Since this 513 * can only be modified by current, we can reuse trace_recursion. 514 */ 515 TRACE_IRQ_BIT, 516 517 /* Set if the function is in the set_graph_function file */ 518 TRACE_GRAPH_BIT, 519 520 /* 521 * In the very unlikely case that an interrupt came in 522 * at a start of graph tracing, and we want to trace 523 * the function in that interrupt, the depth can be greater 524 * than zero, because of the preempted start of a previous 525 * trace. In an even more unlikely case, depth could be 2 526 * if a softirq interrupted the start of graph tracing, 527 * followed by an interrupt preempting a start of graph 528 * tracing in the softirq, and depth can even be 3 529 * if an NMI came in at the start of an interrupt function 530 * that preempted a softirq start of a function that 531 * preempted normal context!!!! Luckily, it can't be 532 * greater than 3, so the next two bits are a mask 533 * of what the depth is when we set TRACE_GRAPH_BIT 534 */ 535 536 TRACE_GRAPH_DEPTH_START_BIT, 537 TRACE_GRAPH_DEPTH_END_BIT, 538 539 /* 540 * To implement set_graph_notrace, if this bit is set, we ignore 541 * function graph tracing of called functions, until the return 542 * function is called to clear it. 543 */ 544 TRACE_GRAPH_NOTRACE_BIT, 545 }; 546 547 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 548 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 549 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 550 551 #define trace_recursion_depth() \ 552 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3) 553 #define trace_recursion_set_depth(depth) \ 554 do { \ 555 current->trace_recursion &= \ 556 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \ 557 current->trace_recursion |= \ 558 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \ 559 } while (0) 560 561 #define TRACE_CONTEXT_BITS 4 562 563 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 564 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 565 566 #define TRACE_LIST_START TRACE_INTERNAL_BIT 567 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 568 569 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 570 571 static __always_inline int trace_get_context_bit(void) 572 { 573 int bit; 574 575 if (in_interrupt()) { 576 if (in_nmi()) 577 bit = 0; 578 579 else if (in_irq()) 580 bit = 1; 581 else 582 bit = 2; 583 } else 584 bit = 3; 585 586 return bit; 587 } 588 589 static __always_inline int trace_test_and_set_recursion(int start, int max) 590 { 591 unsigned int val = current->trace_recursion; 592 int bit; 593 594 /* A previous recursion check was made */ 595 if ((val & TRACE_CONTEXT_MASK) > max) 596 return 0; 597 598 bit = trace_get_context_bit() + start; 599 if (unlikely(val & (1 << bit))) 600 return -1; 601 602 val |= 1 << bit; 603 current->trace_recursion = val; 604 barrier(); 605 606 return bit; 607 } 608 609 static __always_inline void trace_clear_recursion(int bit) 610 { 611 unsigned int val = current->trace_recursion; 612 613 if (!bit) 614 return; 615 616 bit = 1 << bit; 617 val &= ~bit; 618 619 barrier(); 620 current->trace_recursion = val; 621 } 622 623 static inline struct ring_buffer_iter * 624 trace_buffer_iter(struct trace_iterator *iter, int cpu) 625 { 626 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 627 } 628 629 int tracer_init(struct tracer *t, struct trace_array *tr); 630 int tracing_is_enabled(void); 631 void tracing_reset(struct trace_buffer *buf, int cpu); 632 void tracing_reset_online_cpus(struct trace_buffer *buf); 633 void tracing_reset_current(int cpu); 634 void tracing_reset_all_online_cpus(void); 635 int tracing_open_generic(struct inode *inode, struct file *filp); 636 bool tracing_is_disabled(void); 637 bool tracer_tracing_is_on(struct trace_array *tr); 638 void tracer_tracing_on(struct trace_array *tr); 639 void tracer_tracing_off(struct trace_array *tr); 640 struct dentry *trace_create_file(const char *name, 641 umode_t mode, 642 struct dentry *parent, 643 void *data, 644 const struct file_operations *fops); 645 646 struct dentry *tracing_init_dentry(void); 647 648 struct ring_buffer_event; 649 650 struct ring_buffer_event * 651 trace_buffer_lock_reserve(struct ring_buffer *buffer, 652 int type, 653 unsigned long len, 654 unsigned long flags, 655 int pc); 656 657 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 658 struct trace_array_cpu *data); 659 660 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 661 int *ent_cpu, u64 *ent_ts); 662 663 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer, 664 struct ring_buffer_event *event); 665 666 int trace_empty(struct trace_iterator *iter); 667 668 void *trace_find_next_entry_inc(struct trace_iterator *iter); 669 670 void trace_init_global_iter(struct trace_iterator *iter); 671 672 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 673 674 void trace_function(struct trace_array *tr, 675 unsigned long ip, 676 unsigned long parent_ip, 677 unsigned long flags, int pc); 678 void trace_graph_function(struct trace_array *tr, 679 unsigned long ip, 680 unsigned long parent_ip, 681 unsigned long flags, int pc); 682 void trace_latency_header(struct seq_file *m); 683 void trace_default_header(struct seq_file *m); 684 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 685 int trace_empty(struct trace_iterator *iter); 686 687 void trace_graph_return(struct ftrace_graph_ret *trace); 688 int trace_graph_entry(struct ftrace_graph_ent *trace); 689 void set_graph_array(struct trace_array *tr); 690 691 void tracing_start_cmdline_record(void); 692 void tracing_stop_cmdline_record(void); 693 void tracing_start_tgid_record(void); 694 void tracing_stop_tgid_record(void); 695 696 int register_tracer(struct tracer *type); 697 int is_tracing_stopped(void); 698 699 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 700 701 extern cpumask_var_t __read_mostly tracing_buffer_mask; 702 703 #define for_each_tracing_cpu(cpu) \ 704 for_each_cpu(cpu, tracing_buffer_mask) 705 706 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 707 708 extern unsigned long tracing_thresh; 709 710 /* PID filtering */ 711 712 extern int pid_max; 713 714 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 715 pid_t search_pid); 716 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 717 struct task_struct *task); 718 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 719 struct task_struct *self, 720 struct task_struct *task); 721 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 722 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 723 int trace_pid_show(struct seq_file *m, void *v); 724 void trace_free_pid_list(struct trace_pid_list *pid_list); 725 int trace_pid_write(struct trace_pid_list *filtered_pids, 726 struct trace_pid_list **new_pid_list, 727 const char __user *ubuf, size_t cnt); 728 729 #ifdef CONFIG_TRACER_MAX_TRACE 730 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 731 void update_max_tr_single(struct trace_array *tr, 732 struct task_struct *tsk, int cpu); 733 #endif /* CONFIG_TRACER_MAX_TRACE */ 734 735 #ifdef CONFIG_STACKTRACE 736 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 737 int pc); 738 739 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 740 int pc); 741 #else 742 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 743 unsigned long flags, int pc) 744 { 745 } 746 747 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 748 int skip, int pc) 749 { 750 } 751 #endif /* CONFIG_STACKTRACE */ 752 753 extern u64 ftrace_now(int cpu); 754 755 extern void trace_find_cmdline(int pid, char comm[]); 756 extern int trace_find_tgid(int pid); 757 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 758 759 #ifdef CONFIG_DYNAMIC_FTRACE 760 extern unsigned long ftrace_update_tot_cnt; 761 void ftrace_init_trace_array(struct trace_array *tr); 762 #else 763 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 764 #endif 765 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 766 extern int DYN_FTRACE_TEST_NAME(void); 767 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 768 extern int DYN_FTRACE_TEST_NAME2(void); 769 770 extern bool ring_buffer_expanded; 771 extern bool tracing_selftest_disabled; 772 773 #ifdef CONFIG_FTRACE_STARTUP_TEST 774 extern int trace_selftest_startup_function(struct tracer *trace, 775 struct trace_array *tr); 776 extern int trace_selftest_startup_function_graph(struct tracer *trace, 777 struct trace_array *tr); 778 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 779 struct trace_array *tr); 780 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 781 struct trace_array *tr); 782 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 783 struct trace_array *tr); 784 extern int trace_selftest_startup_wakeup(struct tracer *trace, 785 struct trace_array *tr); 786 extern int trace_selftest_startup_nop(struct tracer *trace, 787 struct trace_array *tr); 788 extern int trace_selftest_startup_branch(struct tracer *trace, 789 struct trace_array *tr); 790 /* 791 * Tracer data references selftest functions that only occur 792 * on boot up. These can be __init functions. Thus, when selftests 793 * are enabled, then the tracers need to reference __init functions. 794 */ 795 #define __tracer_data __refdata 796 #else 797 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 798 #define __tracer_data __read_mostly 799 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 800 801 extern void *head_page(struct trace_array_cpu *data); 802 extern unsigned long long ns2usecs(u64 nsec); 803 extern int 804 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 805 extern int 806 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 807 extern int 808 trace_array_vprintk(struct trace_array *tr, 809 unsigned long ip, const char *fmt, va_list args); 810 int trace_array_printk(struct trace_array *tr, 811 unsigned long ip, const char *fmt, ...); 812 int trace_array_printk_buf(struct ring_buffer *buffer, 813 unsigned long ip, const char *fmt, ...); 814 void trace_printk_seq(struct trace_seq *s); 815 enum print_line_t print_trace_line(struct trace_iterator *iter); 816 817 extern char trace_find_mark(unsigned long long duration); 818 819 struct ftrace_hash; 820 821 struct ftrace_mod_load { 822 struct list_head list; 823 char *func; 824 char *module; 825 int enable; 826 }; 827 828 enum { 829 FTRACE_HASH_FL_MOD = (1 << 0), 830 }; 831 832 struct ftrace_hash { 833 unsigned long size_bits; 834 struct hlist_head *buckets; 835 unsigned long count; 836 unsigned long flags; 837 struct rcu_head rcu; 838 }; 839 840 struct ftrace_func_entry * 841 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 842 843 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 844 { 845 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 846 } 847 848 /* Standard output formatting function used for function return traces */ 849 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 850 851 /* Flag options */ 852 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 853 #define TRACE_GRAPH_PRINT_CPU 0x2 854 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 855 #define TRACE_GRAPH_PRINT_PROC 0x8 856 #define TRACE_GRAPH_PRINT_DURATION 0x10 857 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 858 #define TRACE_GRAPH_PRINT_IRQS 0x40 859 #define TRACE_GRAPH_PRINT_TAIL 0x80 860 #define TRACE_GRAPH_SLEEP_TIME 0x100 861 #define TRACE_GRAPH_GRAPH_TIME 0x200 862 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 863 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 864 865 extern void ftrace_graph_sleep_time_control(bool enable); 866 867 #ifdef CONFIG_FUNCTION_PROFILER 868 extern void ftrace_graph_graph_time_control(bool enable); 869 #else 870 static inline void ftrace_graph_graph_time_control(bool enable) { } 871 #endif 872 873 extern enum print_line_t 874 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 875 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 876 extern void 877 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 878 extern void graph_trace_open(struct trace_iterator *iter); 879 extern void graph_trace_close(struct trace_iterator *iter); 880 extern int __trace_graph_entry(struct trace_array *tr, 881 struct ftrace_graph_ent *trace, 882 unsigned long flags, int pc); 883 extern void __trace_graph_return(struct trace_array *tr, 884 struct ftrace_graph_ret *trace, 885 unsigned long flags, int pc); 886 887 #ifdef CONFIG_DYNAMIC_FTRACE 888 extern struct ftrace_hash *ftrace_graph_hash; 889 extern struct ftrace_hash *ftrace_graph_notrace_hash; 890 891 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 892 { 893 unsigned long addr = trace->func; 894 int ret = 0; 895 896 preempt_disable_notrace(); 897 898 if (ftrace_hash_empty(ftrace_graph_hash)) { 899 ret = 1; 900 goto out; 901 } 902 903 if (ftrace_lookup_ip(ftrace_graph_hash, addr)) { 904 905 /* 906 * This needs to be cleared on the return functions 907 * when the depth is zero. 908 */ 909 trace_recursion_set(TRACE_GRAPH_BIT); 910 trace_recursion_set_depth(trace->depth); 911 912 /* 913 * If no irqs are to be traced, but a set_graph_function 914 * is set, and called by an interrupt handler, we still 915 * want to trace it. 916 */ 917 if (in_irq()) 918 trace_recursion_set(TRACE_IRQ_BIT); 919 else 920 trace_recursion_clear(TRACE_IRQ_BIT); 921 ret = 1; 922 } 923 924 out: 925 preempt_enable_notrace(); 926 return ret; 927 } 928 929 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 930 { 931 if (trace_recursion_test(TRACE_GRAPH_BIT) && 932 trace->depth == trace_recursion_depth()) 933 trace_recursion_clear(TRACE_GRAPH_BIT); 934 } 935 936 static inline int ftrace_graph_notrace_addr(unsigned long addr) 937 { 938 int ret = 0; 939 940 preempt_disable_notrace(); 941 942 if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr)) 943 ret = 1; 944 945 preempt_enable_notrace(); 946 return ret; 947 } 948 #else 949 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 950 { 951 return 1; 952 } 953 954 static inline int ftrace_graph_notrace_addr(unsigned long addr) 955 { 956 return 0; 957 } 958 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 959 { } 960 #endif /* CONFIG_DYNAMIC_FTRACE */ 961 962 extern unsigned int fgraph_max_depth; 963 964 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 965 { 966 /* trace it when it is-nested-in or is a function enabled. */ 967 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 968 ftrace_graph_addr(trace)) || 969 (trace->depth < 0) || 970 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 971 } 972 973 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 974 static inline enum print_line_t 975 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 976 { 977 return TRACE_TYPE_UNHANDLED; 978 } 979 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 980 981 extern struct list_head ftrace_pids; 982 983 #ifdef CONFIG_FUNCTION_TRACER 984 struct ftrace_func_command { 985 struct list_head list; 986 char *name; 987 int (*func)(struct trace_array *tr, 988 struct ftrace_hash *hash, 989 char *func, char *cmd, 990 char *params, int enable); 991 }; 992 extern bool ftrace_filter_param __initdata; 993 static inline int ftrace_trace_task(struct trace_array *tr) 994 { 995 return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid); 996 } 997 extern int ftrace_is_dead(void); 998 int ftrace_create_function_files(struct trace_array *tr, 999 struct dentry *parent); 1000 void ftrace_destroy_function_files(struct trace_array *tr); 1001 void ftrace_init_global_array_ops(struct trace_array *tr); 1002 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 1003 void ftrace_reset_array_ops(struct trace_array *tr); 1004 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 1005 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1006 struct dentry *d_tracer); 1007 void ftrace_clear_pids(struct trace_array *tr); 1008 int init_function_trace(void); 1009 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1010 #else 1011 static inline int ftrace_trace_task(struct trace_array *tr) 1012 { 1013 return 1; 1014 } 1015 static inline int ftrace_is_dead(void) { return 0; } 1016 static inline int 1017 ftrace_create_function_files(struct trace_array *tr, 1018 struct dentry *parent) 1019 { 1020 return 0; 1021 } 1022 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1023 static inline __init void 1024 ftrace_init_global_array_ops(struct trace_array *tr) { } 1025 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1026 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1027 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1028 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1029 static inline int init_function_trace(void) { return 0; } 1030 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1031 /* ftace_func_t type is not defined, use macro instead of static inline */ 1032 #define ftrace_init_array_ops(tr, func) do { } while (0) 1033 #endif /* CONFIG_FUNCTION_TRACER */ 1034 1035 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1036 1037 struct ftrace_probe_ops { 1038 void (*func)(unsigned long ip, 1039 unsigned long parent_ip, 1040 struct trace_array *tr, 1041 struct ftrace_probe_ops *ops, 1042 void *data); 1043 int (*init)(struct ftrace_probe_ops *ops, 1044 struct trace_array *tr, 1045 unsigned long ip, void *init_data, 1046 void **data); 1047 void (*free)(struct ftrace_probe_ops *ops, 1048 struct trace_array *tr, 1049 unsigned long ip, void *data); 1050 int (*print)(struct seq_file *m, 1051 unsigned long ip, 1052 struct ftrace_probe_ops *ops, 1053 void *data); 1054 }; 1055 1056 struct ftrace_func_mapper; 1057 typedef int (*ftrace_mapper_func)(void *data); 1058 1059 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1060 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1061 unsigned long ip); 1062 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1063 unsigned long ip, void *data); 1064 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1065 unsigned long ip); 1066 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1067 ftrace_mapper_func free_func); 1068 1069 extern int 1070 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1071 struct ftrace_probe_ops *ops, void *data); 1072 extern int 1073 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1074 struct ftrace_probe_ops *ops); 1075 extern void clear_ftrace_function_probes(struct trace_array *tr); 1076 1077 int register_ftrace_command(struct ftrace_func_command *cmd); 1078 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1079 1080 void ftrace_create_filter_files(struct ftrace_ops *ops, 1081 struct dentry *parent); 1082 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1083 #else 1084 struct ftrace_func_command; 1085 1086 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1087 { 1088 return -EINVAL; 1089 } 1090 static inline __init int unregister_ftrace_command(char *cmd_name) 1091 { 1092 return -EINVAL; 1093 } 1094 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1095 { 1096 } 1097 1098 /* 1099 * The ops parameter passed in is usually undefined. 1100 * This must be a macro. 1101 */ 1102 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1103 #define ftrace_destroy_filter_files(ops) do { } while (0) 1104 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1105 1106 bool ftrace_event_is_function(struct trace_event_call *call); 1107 1108 /* 1109 * struct trace_parser - servers for reading the user input separated by spaces 1110 * @cont: set if the input is not complete - no final space char was found 1111 * @buffer: holds the parsed user input 1112 * @idx: user input length 1113 * @size: buffer size 1114 */ 1115 struct trace_parser { 1116 bool cont; 1117 char *buffer; 1118 unsigned idx; 1119 unsigned size; 1120 }; 1121 1122 static inline bool trace_parser_loaded(struct trace_parser *parser) 1123 { 1124 return (parser->idx != 0); 1125 } 1126 1127 static inline bool trace_parser_cont(struct trace_parser *parser) 1128 { 1129 return parser->cont; 1130 } 1131 1132 static inline void trace_parser_clear(struct trace_parser *parser) 1133 { 1134 parser->cont = false; 1135 parser->idx = 0; 1136 } 1137 1138 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1139 extern void trace_parser_put(struct trace_parser *parser); 1140 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1141 size_t cnt, loff_t *ppos); 1142 1143 /* 1144 * Only create function graph options if function graph is configured. 1145 */ 1146 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1147 # define FGRAPH_FLAGS \ 1148 C(DISPLAY_GRAPH, "display-graph"), 1149 #else 1150 # define FGRAPH_FLAGS 1151 #endif 1152 1153 #ifdef CONFIG_BRANCH_TRACER 1154 # define BRANCH_FLAGS \ 1155 C(BRANCH, "branch"), 1156 #else 1157 # define BRANCH_FLAGS 1158 #endif 1159 1160 #ifdef CONFIG_FUNCTION_TRACER 1161 # define FUNCTION_FLAGS \ 1162 C(FUNCTION, "function-trace"), \ 1163 C(FUNC_FORK, "function-fork"), 1164 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1165 #else 1166 # define FUNCTION_FLAGS 1167 # define FUNCTION_DEFAULT_FLAGS 0UL 1168 # define TRACE_ITER_FUNC_FORK 0UL 1169 #endif 1170 1171 #ifdef CONFIG_STACKTRACE 1172 # define STACK_FLAGS \ 1173 C(STACKTRACE, "stacktrace"), 1174 #else 1175 # define STACK_FLAGS 1176 #endif 1177 1178 /* 1179 * trace_iterator_flags is an enumeration that defines bit 1180 * positions into trace_flags that controls the output. 1181 * 1182 * NOTE: These bits must match the trace_options array in 1183 * trace.c (this macro guarantees it). 1184 */ 1185 #define TRACE_FLAGS \ 1186 C(PRINT_PARENT, "print-parent"), \ 1187 C(SYM_OFFSET, "sym-offset"), \ 1188 C(SYM_ADDR, "sym-addr"), \ 1189 C(VERBOSE, "verbose"), \ 1190 C(RAW, "raw"), \ 1191 C(HEX, "hex"), \ 1192 C(BIN, "bin"), \ 1193 C(BLOCK, "block"), \ 1194 C(PRINTK, "trace_printk"), \ 1195 C(ANNOTATE, "annotate"), \ 1196 C(USERSTACKTRACE, "userstacktrace"), \ 1197 C(SYM_USEROBJ, "sym-userobj"), \ 1198 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1199 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1200 C(LATENCY_FMT, "latency-format"), \ 1201 C(RECORD_CMD, "record-cmd"), \ 1202 C(RECORD_TGID, "record-tgid"), \ 1203 C(OVERWRITE, "overwrite"), \ 1204 C(STOP_ON_FREE, "disable_on_free"), \ 1205 C(IRQ_INFO, "irq-info"), \ 1206 C(MARKERS, "markers"), \ 1207 C(EVENT_FORK, "event-fork"), \ 1208 FUNCTION_FLAGS \ 1209 FGRAPH_FLAGS \ 1210 STACK_FLAGS \ 1211 BRANCH_FLAGS 1212 1213 /* 1214 * By defining C, we can make TRACE_FLAGS a list of bit names 1215 * that will define the bits for the flag masks. 1216 */ 1217 #undef C 1218 #define C(a, b) TRACE_ITER_##a##_BIT 1219 1220 enum trace_iterator_bits { 1221 TRACE_FLAGS 1222 /* Make sure we don't go more than we have bits for */ 1223 TRACE_ITER_LAST_BIT 1224 }; 1225 1226 /* 1227 * By redefining C, we can make TRACE_FLAGS a list of masks that 1228 * use the bits as defined above. 1229 */ 1230 #undef C 1231 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1232 1233 enum trace_iterator_flags { TRACE_FLAGS }; 1234 1235 /* 1236 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1237 * control the output of kernel symbols. 1238 */ 1239 #define TRACE_ITER_SYM_MASK \ 1240 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1241 1242 extern struct tracer nop_trace; 1243 1244 #ifdef CONFIG_BRANCH_TRACER 1245 extern int enable_branch_tracing(struct trace_array *tr); 1246 extern void disable_branch_tracing(void); 1247 static inline int trace_branch_enable(struct trace_array *tr) 1248 { 1249 if (tr->trace_flags & TRACE_ITER_BRANCH) 1250 return enable_branch_tracing(tr); 1251 return 0; 1252 } 1253 static inline void trace_branch_disable(void) 1254 { 1255 /* due to races, always disable */ 1256 disable_branch_tracing(); 1257 } 1258 #else 1259 static inline int trace_branch_enable(struct trace_array *tr) 1260 { 1261 return 0; 1262 } 1263 static inline void trace_branch_disable(void) 1264 { 1265 } 1266 #endif /* CONFIG_BRANCH_TRACER */ 1267 1268 /* set ring buffers to default size if not already done so */ 1269 int tracing_update_buffers(void); 1270 1271 struct ftrace_event_field { 1272 struct list_head link; 1273 const char *name; 1274 const char *type; 1275 int filter_type; 1276 int offset; 1277 int size; 1278 int is_signed; 1279 }; 1280 1281 struct prog_entry; 1282 1283 struct event_filter { 1284 struct prog_entry __rcu *prog; 1285 char *filter_string; 1286 }; 1287 1288 struct event_subsystem { 1289 struct list_head list; 1290 const char *name; 1291 struct event_filter *filter; 1292 int ref_count; 1293 }; 1294 1295 struct trace_subsystem_dir { 1296 struct list_head list; 1297 struct event_subsystem *subsystem; 1298 struct trace_array *tr; 1299 struct dentry *entry; 1300 int ref_count; 1301 int nr_events; 1302 }; 1303 1304 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1305 struct ring_buffer *buffer, 1306 struct ring_buffer_event *event); 1307 1308 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1309 struct ring_buffer *buffer, 1310 struct ring_buffer_event *event, 1311 unsigned long flags, int pc, 1312 struct pt_regs *regs); 1313 1314 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1315 struct ring_buffer *buffer, 1316 struct ring_buffer_event *event, 1317 unsigned long flags, int pc) 1318 { 1319 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL); 1320 } 1321 1322 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1323 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1324 void trace_buffered_event_disable(void); 1325 void trace_buffered_event_enable(void); 1326 1327 static inline void 1328 __trace_event_discard_commit(struct ring_buffer *buffer, 1329 struct ring_buffer_event *event) 1330 { 1331 if (this_cpu_read(trace_buffered_event) == event) { 1332 /* Simply release the temp buffer */ 1333 this_cpu_dec(trace_buffered_event_cnt); 1334 return; 1335 } 1336 ring_buffer_discard_commit(buffer, event); 1337 } 1338 1339 /* 1340 * Helper function for event_trigger_unlock_commit{_regs}(). 1341 * If there are event triggers attached to this event that requires 1342 * filtering against its fields, then they wil be called as the 1343 * entry already holds the field information of the current event. 1344 * 1345 * It also checks if the event should be discarded or not. 1346 * It is to be discarded if the event is soft disabled and the 1347 * event was only recorded to process triggers, or if the event 1348 * filter is active and this event did not match the filters. 1349 * 1350 * Returns true if the event is discarded, false otherwise. 1351 */ 1352 static inline bool 1353 __event_trigger_test_discard(struct trace_event_file *file, 1354 struct ring_buffer *buffer, 1355 struct ring_buffer_event *event, 1356 void *entry, 1357 enum event_trigger_type *tt) 1358 { 1359 unsigned long eflags = file->flags; 1360 1361 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1362 *tt = event_triggers_call(file, entry, event); 1363 1364 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || 1365 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && 1366 !filter_match_preds(file->filter, entry))) { 1367 __trace_event_discard_commit(buffer, event); 1368 return true; 1369 } 1370 1371 return false; 1372 } 1373 1374 /** 1375 * event_trigger_unlock_commit - handle triggers and finish event commit 1376 * @file: The file pointer assoctiated to the event 1377 * @buffer: The ring buffer that the event is being written to 1378 * @event: The event meta data in the ring buffer 1379 * @entry: The event itself 1380 * @irq_flags: The state of the interrupts at the start of the event 1381 * @pc: The state of the preempt count at the start of the event. 1382 * 1383 * This is a helper function to handle triggers that require data 1384 * from the event itself. It also tests the event against filters and 1385 * if the event is soft disabled and should be discarded. 1386 */ 1387 static inline void 1388 event_trigger_unlock_commit(struct trace_event_file *file, 1389 struct ring_buffer *buffer, 1390 struct ring_buffer_event *event, 1391 void *entry, unsigned long irq_flags, int pc) 1392 { 1393 enum event_trigger_type tt = ETT_NONE; 1394 1395 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1396 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc); 1397 1398 if (tt) 1399 event_triggers_post_call(file, tt); 1400 } 1401 1402 /** 1403 * event_trigger_unlock_commit_regs - handle triggers and finish event commit 1404 * @file: The file pointer assoctiated to the event 1405 * @buffer: The ring buffer that the event is being written to 1406 * @event: The event meta data in the ring buffer 1407 * @entry: The event itself 1408 * @irq_flags: The state of the interrupts at the start of the event 1409 * @pc: The state of the preempt count at the start of the event. 1410 * 1411 * This is a helper function to handle triggers that require data 1412 * from the event itself. It also tests the event against filters and 1413 * if the event is soft disabled and should be discarded. 1414 * 1415 * Same as event_trigger_unlock_commit() but calls 1416 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). 1417 */ 1418 static inline void 1419 event_trigger_unlock_commit_regs(struct trace_event_file *file, 1420 struct ring_buffer *buffer, 1421 struct ring_buffer_event *event, 1422 void *entry, unsigned long irq_flags, int pc, 1423 struct pt_regs *regs) 1424 { 1425 enum event_trigger_type tt = ETT_NONE; 1426 1427 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1428 trace_buffer_unlock_commit_regs(file->tr, buffer, event, 1429 irq_flags, pc, regs); 1430 1431 if (tt) 1432 event_triggers_post_call(file, tt); 1433 } 1434 1435 #define FILTER_PRED_INVALID ((unsigned short)-1) 1436 #define FILTER_PRED_IS_RIGHT (1 << 15) 1437 #define FILTER_PRED_FOLD (1 << 15) 1438 1439 /* 1440 * The max preds is the size of unsigned short with 1441 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1442 * and FOLD flags. The other is reserved. 1443 * 1444 * 2^14 preds is way more than enough. 1445 */ 1446 #define MAX_FILTER_PRED 16384 1447 1448 struct filter_pred; 1449 struct regex; 1450 1451 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1452 1453 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1454 1455 enum regex_type { 1456 MATCH_FULL = 0, 1457 MATCH_FRONT_ONLY, 1458 MATCH_MIDDLE_ONLY, 1459 MATCH_END_ONLY, 1460 MATCH_GLOB, 1461 }; 1462 1463 struct regex { 1464 char pattern[MAX_FILTER_STR_VAL]; 1465 int len; 1466 int field_len; 1467 regex_match_func match; 1468 }; 1469 1470 struct filter_pred { 1471 filter_pred_fn_t fn; 1472 u64 val; 1473 struct regex regex; 1474 unsigned short *ops; 1475 struct ftrace_event_field *field; 1476 int offset; 1477 int not; 1478 int op; 1479 }; 1480 1481 static inline bool is_string_field(struct ftrace_event_field *field) 1482 { 1483 return field->filter_type == FILTER_DYN_STRING || 1484 field->filter_type == FILTER_STATIC_STRING || 1485 field->filter_type == FILTER_PTR_STRING || 1486 field->filter_type == FILTER_COMM; 1487 } 1488 1489 static inline bool is_function_field(struct ftrace_event_field *field) 1490 { 1491 return field->filter_type == FILTER_TRACE_FN; 1492 } 1493 1494 extern enum regex_type 1495 filter_parse_regex(char *buff, int len, char **search, int *not); 1496 extern void print_event_filter(struct trace_event_file *file, 1497 struct trace_seq *s); 1498 extern int apply_event_filter(struct trace_event_file *file, 1499 char *filter_string); 1500 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1501 char *filter_string); 1502 extern void print_subsystem_event_filter(struct event_subsystem *system, 1503 struct trace_seq *s); 1504 extern int filter_assign_type(const char *type); 1505 extern int create_event_filter(struct trace_event_call *call, 1506 char *filter_str, bool set_str, 1507 struct event_filter **filterp); 1508 extern void free_event_filter(struct event_filter *filter); 1509 1510 struct ftrace_event_field * 1511 trace_find_event_field(struct trace_event_call *call, char *name); 1512 1513 extern void trace_event_enable_cmd_record(bool enable); 1514 extern void trace_event_enable_tgid_record(bool enable); 1515 1516 extern int event_trace_init(void); 1517 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1518 extern int event_trace_del_tracer(struct trace_array *tr); 1519 1520 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1521 const char *system, 1522 const char *event); 1523 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1524 const char *system, 1525 const char *event); 1526 1527 static inline void *event_file_data(struct file *filp) 1528 { 1529 return READ_ONCE(file_inode(filp)->i_private); 1530 } 1531 1532 extern struct mutex event_mutex; 1533 extern struct list_head ftrace_events; 1534 1535 extern const struct file_operations event_trigger_fops; 1536 extern const struct file_operations event_hist_fops; 1537 1538 #ifdef CONFIG_HIST_TRIGGERS 1539 extern int register_trigger_hist_cmd(void); 1540 extern int register_trigger_hist_enable_disable_cmds(void); 1541 #else 1542 static inline int register_trigger_hist_cmd(void) { return 0; } 1543 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1544 #endif 1545 1546 extern int register_trigger_cmds(void); 1547 extern void clear_event_triggers(struct trace_array *tr); 1548 1549 struct event_trigger_data { 1550 unsigned long count; 1551 int ref; 1552 struct event_trigger_ops *ops; 1553 struct event_command *cmd_ops; 1554 struct event_filter __rcu *filter; 1555 char *filter_str; 1556 void *private_data; 1557 bool paused; 1558 bool paused_tmp; 1559 struct list_head list; 1560 char *name; 1561 struct list_head named_list; 1562 struct event_trigger_data *named_data; 1563 }; 1564 1565 /* Avoid typos */ 1566 #define ENABLE_EVENT_STR "enable_event" 1567 #define DISABLE_EVENT_STR "disable_event" 1568 #define ENABLE_HIST_STR "enable_hist" 1569 #define DISABLE_HIST_STR "disable_hist" 1570 1571 struct enable_trigger_data { 1572 struct trace_event_file *file; 1573 bool enable; 1574 bool hist; 1575 }; 1576 1577 extern int event_enable_trigger_print(struct seq_file *m, 1578 struct event_trigger_ops *ops, 1579 struct event_trigger_data *data); 1580 extern void event_enable_trigger_free(struct event_trigger_ops *ops, 1581 struct event_trigger_data *data); 1582 extern int event_enable_trigger_func(struct event_command *cmd_ops, 1583 struct trace_event_file *file, 1584 char *glob, char *cmd, char *param); 1585 extern int event_enable_register_trigger(char *glob, 1586 struct event_trigger_ops *ops, 1587 struct event_trigger_data *data, 1588 struct trace_event_file *file); 1589 extern void event_enable_unregister_trigger(char *glob, 1590 struct event_trigger_ops *ops, 1591 struct event_trigger_data *test, 1592 struct trace_event_file *file); 1593 extern void trigger_data_free(struct event_trigger_data *data); 1594 extern int event_trigger_init(struct event_trigger_ops *ops, 1595 struct event_trigger_data *data); 1596 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1597 int trigger_enable); 1598 extern void update_cond_flag(struct trace_event_file *file); 1599 extern int set_trigger_filter(char *filter_str, 1600 struct event_trigger_data *trigger_data, 1601 struct trace_event_file *file); 1602 extern struct event_trigger_data *find_named_trigger(const char *name); 1603 extern bool is_named_trigger(struct event_trigger_data *test); 1604 extern int save_named_trigger(const char *name, 1605 struct event_trigger_data *data); 1606 extern void del_named_trigger(struct event_trigger_data *data); 1607 extern void pause_named_trigger(struct event_trigger_data *data); 1608 extern void unpause_named_trigger(struct event_trigger_data *data); 1609 extern void set_named_trigger_data(struct event_trigger_data *data, 1610 struct event_trigger_data *named_data); 1611 extern struct event_trigger_data * 1612 get_named_trigger_data(struct event_trigger_data *data); 1613 extern int register_event_command(struct event_command *cmd); 1614 extern int unregister_event_command(struct event_command *cmd); 1615 extern int register_trigger_hist_enable_disable_cmds(void); 1616 1617 /** 1618 * struct event_trigger_ops - callbacks for trace event triggers 1619 * 1620 * The methods in this structure provide per-event trigger hooks for 1621 * various trigger operations. 1622 * 1623 * All the methods below, except for @init() and @free(), must be 1624 * implemented. 1625 * 1626 * @func: The trigger 'probe' function called when the triggering 1627 * event occurs. The data passed into this callback is the data 1628 * that was supplied to the event_command @reg() function that 1629 * registered the trigger (see struct event_command) along with 1630 * the trace record, rec. 1631 * 1632 * @init: An optional initialization function called for the trigger 1633 * when the trigger is registered (via the event_command reg() 1634 * function). This can be used to perform per-trigger 1635 * initialization such as incrementing a per-trigger reference 1636 * count, for instance. This is usually implemented by the 1637 * generic utility function @event_trigger_init() (see 1638 * trace_event_triggers.c). 1639 * 1640 * @free: An optional de-initialization function called for the 1641 * trigger when the trigger is unregistered (via the 1642 * event_command @reg() function). This can be used to perform 1643 * per-trigger de-initialization such as decrementing a 1644 * per-trigger reference count and freeing corresponding trigger 1645 * data, for instance. This is usually implemented by the 1646 * generic utility function @event_trigger_free() (see 1647 * trace_event_triggers.c). 1648 * 1649 * @print: The callback function invoked to have the trigger print 1650 * itself. This is usually implemented by a wrapper function 1651 * that calls the generic utility function @event_trigger_print() 1652 * (see trace_event_triggers.c). 1653 */ 1654 struct event_trigger_ops { 1655 void (*func)(struct event_trigger_data *data, 1656 void *rec, 1657 struct ring_buffer_event *rbe); 1658 int (*init)(struct event_trigger_ops *ops, 1659 struct event_trigger_data *data); 1660 void (*free)(struct event_trigger_ops *ops, 1661 struct event_trigger_data *data); 1662 int (*print)(struct seq_file *m, 1663 struct event_trigger_ops *ops, 1664 struct event_trigger_data *data); 1665 }; 1666 1667 /** 1668 * struct event_command - callbacks and data members for event commands 1669 * 1670 * Event commands are invoked by users by writing the command name 1671 * into the 'trigger' file associated with a trace event. The 1672 * parameters associated with a specific invocation of an event 1673 * command are used to create an event trigger instance, which is 1674 * added to the list of trigger instances associated with that trace 1675 * event. When the event is hit, the set of triggers associated with 1676 * that event is invoked. 1677 * 1678 * The data members in this structure provide per-event command data 1679 * for various event commands. 1680 * 1681 * All the data members below, except for @post_trigger, must be set 1682 * for each event command. 1683 * 1684 * @name: The unique name that identifies the event command. This is 1685 * the name used when setting triggers via trigger files. 1686 * 1687 * @trigger_type: A unique id that identifies the event command 1688 * 'type'. This value has two purposes, the first to ensure that 1689 * only one trigger of the same type can be set at a given time 1690 * for a particular event e.g. it doesn't make sense to have both 1691 * a traceon and traceoff trigger attached to a single event at 1692 * the same time, so traceon and traceoff have the same type 1693 * though they have different names. The @trigger_type value is 1694 * also used as a bit value for deferring the actual trigger 1695 * action until after the current event is finished. Some 1696 * commands need to do this if they themselves log to the trace 1697 * buffer (see the @post_trigger() member below). @trigger_type 1698 * values are defined by adding new values to the trigger_type 1699 * enum in include/linux/trace_events.h. 1700 * 1701 * @flags: See the enum event_command_flags below. 1702 * 1703 * All the methods below, except for @set_filter() and @unreg_all(), 1704 * must be implemented. 1705 * 1706 * @func: The callback function responsible for parsing and 1707 * registering the trigger written to the 'trigger' file by the 1708 * user. It allocates the trigger instance and registers it with 1709 * the appropriate trace event. It makes use of the other 1710 * event_command callback functions to orchestrate this, and is 1711 * usually implemented by the generic utility function 1712 * @event_trigger_callback() (see trace_event_triggers.c). 1713 * 1714 * @reg: Adds the trigger to the list of triggers associated with the 1715 * event, and enables the event trigger itself, after 1716 * initializing it (via the event_trigger_ops @init() function). 1717 * This is also where commands can use the @trigger_type value to 1718 * make the decision as to whether or not multiple instances of 1719 * the trigger should be allowed. This is usually implemented by 1720 * the generic utility function @register_trigger() (see 1721 * trace_event_triggers.c). 1722 * 1723 * @unreg: Removes the trigger from the list of triggers associated 1724 * with the event, and disables the event trigger itself, after 1725 * initializing it (via the event_trigger_ops @free() function). 1726 * This is usually implemented by the generic utility function 1727 * @unregister_trigger() (see trace_event_triggers.c). 1728 * 1729 * @unreg_all: An optional function called to remove all the triggers 1730 * from the list of triggers associated with the event. Called 1731 * when a trigger file is opened in truncate mode. 1732 * 1733 * @set_filter: An optional function called to parse and set a filter 1734 * for the trigger. If no @set_filter() method is set for the 1735 * event command, filters set by the user for the command will be 1736 * ignored. This is usually implemented by the generic utility 1737 * function @set_trigger_filter() (see trace_event_triggers.c). 1738 * 1739 * @get_trigger_ops: The callback function invoked to retrieve the 1740 * event_trigger_ops implementation associated with the command. 1741 */ 1742 struct event_command { 1743 struct list_head list; 1744 char *name; 1745 enum event_trigger_type trigger_type; 1746 int flags; 1747 int (*func)(struct event_command *cmd_ops, 1748 struct trace_event_file *file, 1749 char *glob, char *cmd, char *params); 1750 int (*reg)(char *glob, 1751 struct event_trigger_ops *ops, 1752 struct event_trigger_data *data, 1753 struct trace_event_file *file); 1754 void (*unreg)(char *glob, 1755 struct event_trigger_ops *ops, 1756 struct event_trigger_data *data, 1757 struct trace_event_file *file); 1758 void (*unreg_all)(struct trace_event_file *file); 1759 int (*set_filter)(char *filter_str, 1760 struct event_trigger_data *data, 1761 struct trace_event_file *file); 1762 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1763 }; 1764 1765 /** 1766 * enum event_command_flags - flags for struct event_command 1767 * 1768 * @POST_TRIGGER: A flag that says whether or not this command needs 1769 * to have its action delayed until after the current event has 1770 * been closed. Some triggers need to avoid being invoked while 1771 * an event is currently in the process of being logged, since 1772 * the trigger may itself log data into the trace buffer. Thus 1773 * we make sure the current event is committed before invoking 1774 * those triggers. To do that, the trigger invocation is split 1775 * in two - the first part checks the filter using the current 1776 * trace record; if a command has the @post_trigger flag set, it 1777 * sets a bit for itself in the return value, otherwise it 1778 * directly invokes the trigger. Once all commands have been 1779 * either invoked or set their return flag, the current record is 1780 * either committed or discarded. At that point, if any commands 1781 * have deferred their triggers, those commands are finally 1782 * invoked following the close of the current event. In other 1783 * words, if the event_trigger_ops @func() probe implementation 1784 * itself logs to the trace buffer, this flag should be set, 1785 * otherwise it can be left unspecified. 1786 * 1787 * @NEEDS_REC: A flag that says whether or not this command needs 1788 * access to the trace record in order to perform its function, 1789 * regardless of whether or not it has a filter associated with 1790 * it (filters make a trigger require access to the trace record 1791 * but are not always present). 1792 */ 1793 enum event_command_flags { 1794 EVENT_CMD_FL_POST_TRIGGER = 1, 1795 EVENT_CMD_FL_NEEDS_REC = 2, 1796 }; 1797 1798 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1799 { 1800 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1801 } 1802 1803 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1804 { 1805 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1806 } 1807 1808 extern int trace_event_enable_disable(struct trace_event_file *file, 1809 int enable, int soft_disable); 1810 extern int tracing_alloc_snapshot(void); 1811 1812 extern const char *__start___trace_bprintk_fmt[]; 1813 extern const char *__stop___trace_bprintk_fmt[]; 1814 1815 extern const char *__start___tracepoint_str[]; 1816 extern const char *__stop___tracepoint_str[]; 1817 1818 void trace_printk_control(bool enabled); 1819 void trace_printk_init_buffers(void); 1820 void trace_printk_start_comm(void); 1821 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1822 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1823 1824 #define MAX_EVENT_NAME_LEN 64 1825 1826 extern int trace_run_command(const char *buf, int (*createfn)(int, char**)); 1827 extern ssize_t trace_parse_run_command(struct file *file, 1828 const char __user *buffer, size_t count, loff_t *ppos, 1829 int (*createfn)(int, char**)); 1830 1831 /* 1832 * Normal trace_printk() and friends allocates special buffers 1833 * to do the manipulation, as well as saves the print formats 1834 * into sections to display. But the trace infrastructure wants 1835 * to use these without the added overhead at the price of being 1836 * a bit slower (used mainly for warnings, where we don't care 1837 * about performance). The internal_trace_puts() is for such 1838 * a purpose. 1839 */ 1840 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1841 1842 #undef FTRACE_ENTRY 1843 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1844 extern struct trace_event_call \ 1845 __aligned(4) event_##call; 1846 #undef FTRACE_ENTRY_DUP 1847 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1848 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1849 filter) 1850 #undef FTRACE_ENTRY_PACKED 1851 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \ 1852 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1853 filter) 1854 1855 #include "trace_entries.h" 1856 1857 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1858 int perf_ftrace_event_register(struct trace_event_call *call, 1859 enum trace_reg type, void *data); 1860 #else 1861 #define perf_ftrace_event_register NULL 1862 #endif 1863 1864 #ifdef CONFIG_FTRACE_SYSCALLS 1865 void init_ftrace_syscalls(void); 1866 const char *get_syscall_name(int syscall); 1867 #else 1868 static inline void init_ftrace_syscalls(void) { } 1869 static inline const char *get_syscall_name(int syscall) 1870 { 1871 return NULL; 1872 } 1873 #endif 1874 1875 #ifdef CONFIG_EVENT_TRACING 1876 void trace_event_init(void); 1877 void trace_event_eval_update(struct trace_eval_map **map, int len); 1878 #else 1879 static inline void __init trace_event_init(void) { } 1880 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1881 #endif 1882 1883 #ifdef CONFIG_TRACER_SNAPSHOT 1884 void tracing_snapshot_instance(struct trace_array *tr); 1885 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1886 #else 1887 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1888 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1889 { 1890 return 0; 1891 } 1892 #endif 1893 1894 #ifdef CONFIG_PREEMPT_TRACER 1895 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1896 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1897 #else 1898 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1899 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1900 #endif 1901 #ifdef CONFIG_IRQSOFF_TRACER 1902 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1903 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1904 #else 1905 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1906 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1907 #endif 1908 1909 extern struct trace_iterator *tracepoint_print_iter; 1910 1911 #endif /* _LINUX_KERNEL_TRACE_H */ 1912