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 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 198 199 /** 200 * struct cond_snapshot - conditional snapshot data and callback 201 * 202 * The cond_snapshot structure encapsulates a callback function and 203 * data associated with the snapshot for a given tracing instance. 204 * 205 * When a snapshot is taken conditionally, by invoking 206 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 207 * passed in turn to the cond_snapshot.update() function. That data 208 * can be compared by the update() implementation with the cond_data 209 * contained wihin the struct cond_snapshot instance associated with 210 * the trace_array. Because the tr->max_lock is held throughout the 211 * update() call, the update() function can directly retrieve the 212 * cond_snapshot and cond_data associated with the per-instance 213 * snapshot associated with the trace_array. 214 * 215 * The cond_snapshot.update() implementation can save data to be 216 * associated with the snapshot if it decides to, and returns 'true' 217 * in that case, or it returns 'false' if the conditional snapshot 218 * shouldn't be taken. 219 * 220 * The cond_snapshot instance is created and associated with the 221 * user-defined cond_data by tracing_cond_snapshot_enable(). 222 * Likewise, the cond_snapshot instance is destroyed and is no longer 223 * associated with the trace instance by 224 * tracing_cond_snapshot_disable(). 225 * 226 * The method below is required. 227 * 228 * @update: When a conditional snapshot is invoked, the update() 229 * callback function is invoked with the tr->max_lock held. The 230 * update() implementation signals whether or not to actually 231 * take the snapshot, by returning 'true' if so, 'false' if no 232 * snapshot should be taken. Because the max_lock is held for 233 * the duration of update(), the implementation is safe to 234 * directly retrieven and save any implementation data it needs 235 * to in association with the snapshot. 236 */ 237 struct cond_snapshot { 238 void *cond_data; 239 cond_update_fn_t update; 240 }; 241 242 /* 243 * The trace array - an array of per-CPU trace arrays. This is the 244 * highest level data structure that individual tracers deal with. 245 * They have on/off state as well: 246 */ 247 struct trace_array { 248 struct list_head list; 249 char *name; 250 struct trace_buffer trace_buffer; 251 #ifdef CONFIG_TRACER_MAX_TRACE 252 /* 253 * The max_buffer is used to snapshot the trace when a maximum 254 * latency is reached, or when the user initiates a snapshot. 255 * Some tracers will use this to store a maximum trace while 256 * it continues examining live traces. 257 * 258 * The buffers for the max_buffer are set up the same as the trace_buffer 259 * When a snapshot is taken, the buffer of the max_buffer is swapped 260 * with the buffer of the trace_buffer and the buffers are reset for 261 * the trace_buffer so the tracing can continue. 262 */ 263 struct trace_buffer max_buffer; 264 bool allocated_snapshot; 265 #endif 266 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) 267 unsigned long max_latency; 268 #endif 269 struct trace_pid_list __rcu *filtered_pids; 270 /* 271 * max_lock is used to protect the swapping of buffers 272 * when taking a max snapshot. The buffers themselves are 273 * protected by per_cpu spinlocks. But the action of the swap 274 * needs its own lock. 275 * 276 * This is defined as a arch_spinlock_t in order to help 277 * with performance when lockdep debugging is enabled. 278 * 279 * It is also used in other places outside the update_max_tr 280 * so it needs to be defined outside of the 281 * CONFIG_TRACER_MAX_TRACE. 282 */ 283 arch_spinlock_t max_lock; 284 int buffer_disabled; 285 #ifdef CONFIG_FTRACE_SYSCALLS 286 int sys_refcount_enter; 287 int sys_refcount_exit; 288 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 289 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 290 #endif 291 int stop_count; 292 int clock_id; 293 int nr_topts; 294 bool clear_trace; 295 int buffer_percent; 296 struct tracer *current_trace; 297 unsigned int trace_flags; 298 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 299 unsigned int flags; 300 raw_spinlock_t start_lock; 301 struct dentry *dir; 302 struct dentry *options; 303 struct dentry *percpu_dir; 304 struct dentry *event_dir; 305 struct trace_options *topts; 306 struct list_head systems; 307 struct list_head events; 308 struct trace_event_file *trace_marker_file; 309 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 310 int ref; 311 #ifdef CONFIG_FUNCTION_TRACER 312 struct ftrace_ops *ops; 313 struct trace_pid_list __rcu *function_pids; 314 #ifdef CONFIG_DYNAMIC_FTRACE 315 /* All of these are protected by the ftrace_lock */ 316 struct list_head func_probes; 317 struct list_head mod_trace; 318 struct list_head mod_notrace; 319 #endif 320 /* function tracing enabled */ 321 int function_enabled; 322 #endif 323 int time_stamp_abs_ref; 324 struct list_head hist_vars; 325 #ifdef CONFIG_TRACER_SNAPSHOT 326 struct cond_snapshot *cond_snapshot; 327 #endif 328 }; 329 330 enum { 331 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 332 }; 333 334 extern struct list_head ftrace_trace_arrays; 335 336 extern struct mutex trace_types_lock; 337 338 extern int trace_array_get(struct trace_array *tr); 339 extern void trace_array_put(struct trace_array *tr); 340 341 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs); 342 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 343 344 extern bool trace_clock_in_ns(struct trace_array *tr); 345 346 /* 347 * The global tracer (top) should be the first trace array added, 348 * but we check the flag anyway. 349 */ 350 static inline struct trace_array *top_trace_array(void) 351 { 352 struct trace_array *tr; 353 354 if (list_empty(&ftrace_trace_arrays)) 355 return NULL; 356 357 tr = list_entry(ftrace_trace_arrays.prev, 358 typeof(*tr), list); 359 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 360 return tr; 361 } 362 363 #define FTRACE_CMP_TYPE(var, type) \ 364 __builtin_types_compatible_p(typeof(var), type *) 365 366 #undef IF_ASSIGN 367 #define IF_ASSIGN(var, entry, etype, id) \ 368 if (FTRACE_CMP_TYPE(var, etype)) { \ 369 var = (typeof(var))(entry); \ 370 WARN_ON(id && (entry)->type != id); \ 371 break; \ 372 } 373 374 /* Will cause compile errors if type is not found. */ 375 extern void __ftrace_bad_type(void); 376 377 /* 378 * The trace_assign_type is a verifier that the entry type is 379 * the same as the type being assigned. To add new types simply 380 * add a line with the following format: 381 * 382 * IF_ASSIGN(var, ent, type, id); 383 * 384 * Where "type" is the trace type that includes the trace_entry 385 * as the "ent" item. And "id" is the trace identifier that is 386 * used in the trace_type enum. 387 * 388 * If the type can have more than one id, then use zero. 389 */ 390 #define trace_assign_type(var, ent) \ 391 do { \ 392 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 393 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 394 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 395 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 396 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 397 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 398 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 399 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 400 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 401 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 402 TRACE_MMIO_RW); \ 403 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 404 TRACE_MMIO_MAP); \ 405 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 406 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 407 TRACE_GRAPH_ENT); \ 408 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 409 TRACE_GRAPH_RET); \ 410 __ftrace_bad_type(); \ 411 } while (0) 412 413 /* 414 * An option specific to a tracer. This is a boolean value. 415 * The bit is the bit index that sets its value on the 416 * flags value in struct tracer_flags. 417 */ 418 struct tracer_opt { 419 const char *name; /* Will appear on the trace_options file */ 420 u32 bit; /* Mask assigned in val field in tracer_flags */ 421 }; 422 423 /* 424 * The set of specific options for a tracer. Your tracer 425 * have to set the initial value of the flags val. 426 */ 427 struct tracer_flags { 428 u32 val; 429 struct tracer_opt *opts; 430 struct tracer *trace; 431 }; 432 433 /* Makes more easy to define a tracer opt */ 434 #define TRACER_OPT(s, b) .name = #s, .bit = b 435 436 437 struct trace_option_dentry { 438 struct tracer_opt *opt; 439 struct tracer_flags *flags; 440 struct trace_array *tr; 441 struct dentry *entry; 442 }; 443 444 /** 445 * struct tracer - a specific tracer and its callbacks to interact with tracefs 446 * @name: the name chosen to select it on the available_tracers file 447 * @init: called when one switches to this tracer (echo name > current_tracer) 448 * @reset: called when one switches to another tracer 449 * @start: called when tracing is unpaused (echo 1 > tracing_on) 450 * @stop: called when tracing is paused (echo 0 > tracing_on) 451 * @update_thresh: called when tracing_thresh is updated 452 * @open: called when the trace file is opened 453 * @pipe_open: called when the trace_pipe file is opened 454 * @close: called when the trace file is released 455 * @pipe_close: called when the trace_pipe file is released 456 * @read: override the default read callback on trace_pipe 457 * @splice_read: override the default splice_read callback on trace_pipe 458 * @selftest: selftest to run on boot (see trace_selftest.c) 459 * @print_headers: override the first lines that describe your columns 460 * @print_line: callback that prints a trace 461 * @set_flag: signals one of your private flags changed (trace_options file) 462 * @flags: your private flags 463 */ 464 struct tracer { 465 const char *name; 466 int (*init)(struct trace_array *tr); 467 void (*reset)(struct trace_array *tr); 468 void (*start)(struct trace_array *tr); 469 void (*stop)(struct trace_array *tr); 470 int (*update_thresh)(struct trace_array *tr); 471 void (*open)(struct trace_iterator *iter); 472 void (*pipe_open)(struct trace_iterator *iter); 473 void (*close)(struct trace_iterator *iter); 474 void (*pipe_close)(struct trace_iterator *iter); 475 ssize_t (*read)(struct trace_iterator *iter, 476 struct file *filp, char __user *ubuf, 477 size_t cnt, loff_t *ppos); 478 ssize_t (*splice_read)(struct trace_iterator *iter, 479 struct file *filp, 480 loff_t *ppos, 481 struct pipe_inode_info *pipe, 482 size_t len, 483 unsigned int flags); 484 #ifdef CONFIG_FTRACE_STARTUP_TEST 485 int (*selftest)(struct tracer *trace, 486 struct trace_array *tr); 487 #endif 488 void (*print_header)(struct seq_file *m); 489 enum print_line_t (*print_line)(struct trace_iterator *iter); 490 /* If you handled the flag setting, return 0 */ 491 int (*set_flag)(struct trace_array *tr, 492 u32 old_flags, u32 bit, int set); 493 /* Return 0 if OK with change, else return non-zero */ 494 int (*flag_changed)(struct trace_array *tr, 495 u32 mask, int set); 496 struct tracer *next; 497 struct tracer_flags *flags; 498 int enabled; 499 int ref; 500 bool print_max; 501 bool allow_instances; 502 #ifdef CONFIG_TRACER_MAX_TRACE 503 bool use_max_tr; 504 #endif 505 /* True if tracer cannot be enabled in kernel param */ 506 bool noboot; 507 }; 508 509 510 /* Only current can touch trace_recursion */ 511 512 /* 513 * For function tracing recursion: 514 * The order of these bits are important. 515 * 516 * When function tracing occurs, the following steps are made: 517 * If arch does not support a ftrace feature: 518 * call internal function (uses INTERNAL bits) which calls... 519 * If callback is registered to the "global" list, the list 520 * function is called and recursion checks the GLOBAL bits. 521 * then this function calls... 522 * The function callback, which can use the FTRACE bits to 523 * check for recursion. 524 * 525 * Now if the arch does not suppport a feature, and it calls 526 * the global list function which calls the ftrace callback 527 * all three of these steps will do a recursion protection. 528 * There's no reason to do one if the previous caller already 529 * did. The recursion that we are protecting against will 530 * go through the same steps again. 531 * 532 * To prevent the multiple recursion checks, if a recursion 533 * bit is set that is higher than the MAX bit of the current 534 * check, then we know that the check was made by the previous 535 * caller, and we can skip the current check. 536 */ 537 enum { 538 TRACE_BUFFER_BIT, 539 TRACE_BUFFER_NMI_BIT, 540 TRACE_BUFFER_IRQ_BIT, 541 TRACE_BUFFER_SIRQ_BIT, 542 543 /* Start of function recursion bits */ 544 TRACE_FTRACE_BIT, 545 TRACE_FTRACE_NMI_BIT, 546 TRACE_FTRACE_IRQ_BIT, 547 TRACE_FTRACE_SIRQ_BIT, 548 549 /* INTERNAL_BITs must be greater than FTRACE_BITs */ 550 TRACE_INTERNAL_BIT, 551 TRACE_INTERNAL_NMI_BIT, 552 TRACE_INTERNAL_IRQ_BIT, 553 TRACE_INTERNAL_SIRQ_BIT, 554 555 TRACE_BRANCH_BIT, 556 /* 557 * Abuse of the trace_recursion. 558 * As we need a way to maintain state if we are tracing the function 559 * graph in irq because we want to trace a particular function that 560 * was called in irq context but we have irq tracing off. Since this 561 * can only be modified by current, we can reuse trace_recursion. 562 */ 563 TRACE_IRQ_BIT, 564 565 /* Set if the function is in the set_graph_function file */ 566 TRACE_GRAPH_BIT, 567 568 /* 569 * In the very unlikely case that an interrupt came in 570 * at a start of graph tracing, and we want to trace 571 * the function in that interrupt, the depth can be greater 572 * than zero, because of the preempted start of a previous 573 * trace. In an even more unlikely case, depth could be 2 574 * if a softirq interrupted the start of graph tracing, 575 * followed by an interrupt preempting a start of graph 576 * tracing in the softirq, and depth can even be 3 577 * if an NMI came in at the start of an interrupt function 578 * that preempted a softirq start of a function that 579 * preempted normal context!!!! Luckily, it can't be 580 * greater than 3, so the next two bits are a mask 581 * of what the depth is when we set TRACE_GRAPH_BIT 582 */ 583 584 TRACE_GRAPH_DEPTH_START_BIT, 585 TRACE_GRAPH_DEPTH_END_BIT, 586 587 /* 588 * To implement set_graph_notrace, if this bit is set, we ignore 589 * function graph tracing of called functions, until the return 590 * function is called to clear it. 591 */ 592 TRACE_GRAPH_NOTRACE_BIT, 593 }; 594 595 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 596 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 597 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 598 599 #define trace_recursion_depth() \ 600 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3) 601 #define trace_recursion_set_depth(depth) \ 602 do { \ 603 current->trace_recursion &= \ 604 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \ 605 current->trace_recursion |= \ 606 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \ 607 } while (0) 608 609 #define TRACE_CONTEXT_BITS 4 610 611 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 612 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 613 614 #define TRACE_LIST_START TRACE_INTERNAL_BIT 615 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 616 617 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 618 619 static __always_inline int trace_get_context_bit(void) 620 { 621 int bit; 622 623 if (in_interrupt()) { 624 if (in_nmi()) 625 bit = 0; 626 627 else if (in_irq()) 628 bit = 1; 629 else 630 bit = 2; 631 } else 632 bit = 3; 633 634 return bit; 635 } 636 637 static __always_inline int trace_test_and_set_recursion(int start, int max) 638 { 639 unsigned int val = current->trace_recursion; 640 int bit; 641 642 /* A previous recursion check was made */ 643 if ((val & TRACE_CONTEXT_MASK) > max) 644 return 0; 645 646 bit = trace_get_context_bit() + start; 647 if (unlikely(val & (1 << bit))) 648 return -1; 649 650 val |= 1 << bit; 651 current->trace_recursion = val; 652 barrier(); 653 654 return bit; 655 } 656 657 static __always_inline void trace_clear_recursion(int bit) 658 { 659 unsigned int val = current->trace_recursion; 660 661 if (!bit) 662 return; 663 664 bit = 1 << bit; 665 val &= ~bit; 666 667 barrier(); 668 current->trace_recursion = val; 669 } 670 671 static inline struct ring_buffer_iter * 672 trace_buffer_iter(struct trace_iterator *iter, int cpu) 673 { 674 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 675 } 676 677 int tracer_init(struct tracer *t, struct trace_array *tr); 678 int tracing_is_enabled(void); 679 void tracing_reset(struct trace_buffer *buf, int cpu); 680 void tracing_reset_online_cpus(struct trace_buffer *buf); 681 void tracing_reset_current(int cpu); 682 void tracing_reset_all_online_cpus(void); 683 int tracing_open_generic(struct inode *inode, struct file *filp); 684 bool tracing_is_disabled(void); 685 bool tracer_tracing_is_on(struct trace_array *tr); 686 void tracer_tracing_on(struct trace_array *tr); 687 void tracer_tracing_off(struct trace_array *tr); 688 struct dentry *trace_create_file(const char *name, 689 umode_t mode, 690 struct dentry *parent, 691 void *data, 692 const struct file_operations *fops); 693 694 struct dentry *tracing_init_dentry(void); 695 696 struct ring_buffer_event; 697 698 struct ring_buffer_event * 699 trace_buffer_lock_reserve(struct ring_buffer *buffer, 700 int type, 701 unsigned long len, 702 unsigned long flags, 703 int pc); 704 705 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 706 struct trace_array_cpu *data); 707 708 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 709 int *ent_cpu, u64 *ent_ts); 710 711 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer, 712 struct ring_buffer_event *event); 713 714 int trace_empty(struct trace_iterator *iter); 715 716 void *trace_find_next_entry_inc(struct trace_iterator *iter); 717 718 void trace_init_global_iter(struct trace_iterator *iter); 719 720 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 721 722 void trace_function(struct trace_array *tr, 723 unsigned long ip, 724 unsigned long parent_ip, 725 unsigned long flags, int pc); 726 void trace_graph_function(struct trace_array *tr, 727 unsigned long ip, 728 unsigned long parent_ip, 729 unsigned long flags, int pc); 730 void trace_latency_header(struct seq_file *m); 731 void trace_default_header(struct seq_file *m); 732 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 733 int trace_empty(struct trace_iterator *iter); 734 735 void trace_graph_return(struct ftrace_graph_ret *trace); 736 int trace_graph_entry(struct ftrace_graph_ent *trace); 737 void set_graph_array(struct trace_array *tr); 738 739 void tracing_start_cmdline_record(void); 740 void tracing_stop_cmdline_record(void); 741 void tracing_start_tgid_record(void); 742 void tracing_stop_tgid_record(void); 743 744 int register_tracer(struct tracer *type); 745 int is_tracing_stopped(void); 746 747 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 748 749 extern cpumask_var_t __read_mostly tracing_buffer_mask; 750 751 #define for_each_tracing_cpu(cpu) \ 752 for_each_cpu(cpu, tracing_buffer_mask) 753 754 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 755 756 extern unsigned long tracing_thresh; 757 758 /* PID filtering */ 759 760 extern int pid_max; 761 762 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 763 pid_t search_pid); 764 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 765 struct task_struct *task); 766 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 767 struct task_struct *self, 768 struct task_struct *task); 769 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 770 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 771 int trace_pid_show(struct seq_file *m, void *v); 772 void trace_free_pid_list(struct trace_pid_list *pid_list); 773 int trace_pid_write(struct trace_pid_list *filtered_pids, 774 struct trace_pid_list **new_pid_list, 775 const char __user *ubuf, size_t cnt); 776 777 #ifdef CONFIG_TRACER_MAX_TRACE 778 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 779 void *cond_data); 780 void update_max_tr_single(struct trace_array *tr, 781 struct task_struct *tsk, int cpu); 782 #endif /* CONFIG_TRACER_MAX_TRACE */ 783 784 #ifdef CONFIG_STACKTRACE 785 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 786 int pc); 787 788 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 789 int pc); 790 #else 791 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 792 unsigned long flags, int pc) 793 { 794 } 795 796 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 797 int skip, int pc) 798 { 799 } 800 #endif /* CONFIG_STACKTRACE */ 801 802 extern u64 ftrace_now(int cpu); 803 804 extern void trace_find_cmdline(int pid, char comm[]); 805 extern int trace_find_tgid(int pid); 806 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 807 808 #ifdef CONFIG_DYNAMIC_FTRACE 809 extern unsigned long ftrace_update_tot_cnt; 810 void ftrace_init_trace_array(struct trace_array *tr); 811 #else 812 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 813 #endif 814 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 815 extern int DYN_FTRACE_TEST_NAME(void); 816 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 817 extern int DYN_FTRACE_TEST_NAME2(void); 818 819 extern bool ring_buffer_expanded; 820 extern bool tracing_selftest_disabled; 821 822 #ifdef CONFIG_FTRACE_STARTUP_TEST 823 extern int trace_selftest_startup_function(struct tracer *trace, 824 struct trace_array *tr); 825 extern int trace_selftest_startup_function_graph(struct tracer *trace, 826 struct trace_array *tr); 827 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 828 struct trace_array *tr); 829 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 830 struct trace_array *tr); 831 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 832 struct trace_array *tr); 833 extern int trace_selftest_startup_wakeup(struct tracer *trace, 834 struct trace_array *tr); 835 extern int trace_selftest_startup_nop(struct tracer *trace, 836 struct trace_array *tr); 837 extern int trace_selftest_startup_branch(struct tracer *trace, 838 struct trace_array *tr); 839 /* 840 * Tracer data references selftest functions that only occur 841 * on boot up. These can be __init functions. Thus, when selftests 842 * are enabled, then the tracers need to reference __init functions. 843 */ 844 #define __tracer_data __refdata 845 #else 846 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 847 #define __tracer_data __read_mostly 848 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 849 850 extern void *head_page(struct trace_array_cpu *data); 851 extern unsigned long long ns2usecs(u64 nsec); 852 extern int 853 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 854 extern int 855 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 856 extern int 857 trace_array_vprintk(struct trace_array *tr, 858 unsigned long ip, const char *fmt, va_list args); 859 int trace_array_printk(struct trace_array *tr, 860 unsigned long ip, const char *fmt, ...); 861 int trace_array_printk_buf(struct ring_buffer *buffer, 862 unsigned long ip, const char *fmt, ...); 863 void trace_printk_seq(struct trace_seq *s); 864 enum print_line_t print_trace_line(struct trace_iterator *iter); 865 866 extern char trace_find_mark(unsigned long long duration); 867 868 struct ftrace_hash; 869 870 struct ftrace_mod_load { 871 struct list_head list; 872 char *func; 873 char *module; 874 int enable; 875 }; 876 877 enum { 878 FTRACE_HASH_FL_MOD = (1 << 0), 879 }; 880 881 struct ftrace_hash { 882 unsigned long size_bits; 883 struct hlist_head *buckets; 884 unsigned long count; 885 unsigned long flags; 886 struct rcu_head rcu; 887 }; 888 889 struct ftrace_func_entry * 890 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 891 892 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 893 { 894 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 895 } 896 897 /* Standard output formatting function used for function return traces */ 898 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 899 900 /* Flag options */ 901 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 902 #define TRACE_GRAPH_PRINT_CPU 0x2 903 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 904 #define TRACE_GRAPH_PRINT_PROC 0x8 905 #define TRACE_GRAPH_PRINT_DURATION 0x10 906 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 907 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 908 #define TRACE_GRAPH_PRINT_IRQS 0x80 909 #define TRACE_GRAPH_PRINT_TAIL 0x100 910 #define TRACE_GRAPH_SLEEP_TIME 0x200 911 #define TRACE_GRAPH_GRAPH_TIME 0x400 912 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 913 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 914 915 extern void ftrace_graph_sleep_time_control(bool enable); 916 917 #ifdef CONFIG_FUNCTION_PROFILER 918 extern void ftrace_graph_graph_time_control(bool enable); 919 #else 920 static inline void ftrace_graph_graph_time_control(bool enable) { } 921 #endif 922 923 extern enum print_line_t 924 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 925 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 926 extern void 927 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 928 extern void graph_trace_open(struct trace_iterator *iter); 929 extern void graph_trace_close(struct trace_iterator *iter); 930 extern int __trace_graph_entry(struct trace_array *tr, 931 struct ftrace_graph_ent *trace, 932 unsigned long flags, int pc); 933 extern void __trace_graph_return(struct trace_array *tr, 934 struct ftrace_graph_ret *trace, 935 unsigned long flags, int pc); 936 937 #ifdef CONFIG_DYNAMIC_FTRACE 938 extern struct ftrace_hash *ftrace_graph_hash; 939 extern struct ftrace_hash *ftrace_graph_notrace_hash; 940 941 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 942 { 943 unsigned long addr = trace->func; 944 int ret = 0; 945 946 preempt_disable_notrace(); 947 948 if (ftrace_hash_empty(ftrace_graph_hash)) { 949 ret = 1; 950 goto out; 951 } 952 953 if (ftrace_lookup_ip(ftrace_graph_hash, addr)) { 954 955 /* 956 * This needs to be cleared on the return functions 957 * when the depth is zero. 958 */ 959 trace_recursion_set(TRACE_GRAPH_BIT); 960 trace_recursion_set_depth(trace->depth); 961 962 /* 963 * If no irqs are to be traced, but a set_graph_function 964 * is set, and called by an interrupt handler, we still 965 * want to trace it. 966 */ 967 if (in_irq()) 968 trace_recursion_set(TRACE_IRQ_BIT); 969 else 970 trace_recursion_clear(TRACE_IRQ_BIT); 971 ret = 1; 972 } 973 974 out: 975 preempt_enable_notrace(); 976 return ret; 977 } 978 979 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 980 { 981 if (trace_recursion_test(TRACE_GRAPH_BIT) && 982 trace->depth == trace_recursion_depth()) 983 trace_recursion_clear(TRACE_GRAPH_BIT); 984 } 985 986 static inline int ftrace_graph_notrace_addr(unsigned long addr) 987 { 988 int ret = 0; 989 990 preempt_disable_notrace(); 991 992 if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr)) 993 ret = 1; 994 995 preempt_enable_notrace(); 996 return ret; 997 } 998 #else 999 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 1000 { 1001 return 1; 1002 } 1003 1004 static inline int ftrace_graph_notrace_addr(unsigned long addr) 1005 { 1006 return 0; 1007 } 1008 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 1009 { } 1010 #endif /* CONFIG_DYNAMIC_FTRACE */ 1011 1012 extern unsigned int fgraph_max_depth; 1013 1014 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 1015 { 1016 /* trace it when it is-nested-in or is a function enabled. */ 1017 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 1018 ftrace_graph_addr(trace)) || 1019 (trace->depth < 0) || 1020 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 1021 } 1022 1023 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 1024 static inline enum print_line_t 1025 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 1026 { 1027 return TRACE_TYPE_UNHANDLED; 1028 } 1029 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 1030 1031 extern struct list_head ftrace_pids; 1032 1033 #ifdef CONFIG_FUNCTION_TRACER 1034 struct ftrace_func_command { 1035 struct list_head list; 1036 char *name; 1037 int (*func)(struct trace_array *tr, 1038 struct ftrace_hash *hash, 1039 char *func, char *cmd, 1040 char *params, int enable); 1041 }; 1042 extern bool ftrace_filter_param __initdata; 1043 static inline int ftrace_trace_task(struct trace_array *tr) 1044 { 1045 return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid); 1046 } 1047 extern int ftrace_is_dead(void); 1048 int ftrace_create_function_files(struct trace_array *tr, 1049 struct dentry *parent); 1050 void ftrace_destroy_function_files(struct trace_array *tr); 1051 void ftrace_init_global_array_ops(struct trace_array *tr); 1052 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 1053 void ftrace_reset_array_ops(struct trace_array *tr); 1054 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 1055 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1056 struct dentry *d_tracer); 1057 void ftrace_clear_pids(struct trace_array *tr); 1058 int init_function_trace(void); 1059 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1060 #else 1061 static inline int ftrace_trace_task(struct trace_array *tr) 1062 { 1063 return 1; 1064 } 1065 static inline int ftrace_is_dead(void) { return 0; } 1066 static inline int 1067 ftrace_create_function_files(struct trace_array *tr, 1068 struct dentry *parent) 1069 { 1070 return 0; 1071 } 1072 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1073 static inline __init void 1074 ftrace_init_global_array_ops(struct trace_array *tr) { } 1075 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1076 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1077 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1078 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1079 static inline int init_function_trace(void) { return 0; } 1080 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1081 /* ftace_func_t type is not defined, use macro instead of static inline */ 1082 #define ftrace_init_array_ops(tr, func) do { } while (0) 1083 #endif /* CONFIG_FUNCTION_TRACER */ 1084 1085 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1086 1087 struct ftrace_probe_ops { 1088 void (*func)(unsigned long ip, 1089 unsigned long parent_ip, 1090 struct trace_array *tr, 1091 struct ftrace_probe_ops *ops, 1092 void *data); 1093 int (*init)(struct ftrace_probe_ops *ops, 1094 struct trace_array *tr, 1095 unsigned long ip, void *init_data, 1096 void **data); 1097 void (*free)(struct ftrace_probe_ops *ops, 1098 struct trace_array *tr, 1099 unsigned long ip, void *data); 1100 int (*print)(struct seq_file *m, 1101 unsigned long ip, 1102 struct ftrace_probe_ops *ops, 1103 void *data); 1104 }; 1105 1106 struct ftrace_func_mapper; 1107 typedef int (*ftrace_mapper_func)(void *data); 1108 1109 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1110 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1111 unsigned long ip); 1112 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1113 unsigned long ip, void *data); 1114 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1115 unsigned long ip); 1116 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1117 ftrace_mapper_func free_func); 1118 1119 extern int 1120 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1121 struct ftrace_probe_ops *ops, void *data); 1122 extern int 1123 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1124 struct ftrace_probe_ops *ops); 1125 extern void clear_ftrace_function_probes(struct trace_array *tr); 1126 1127 int register_ftrace_command(struct ftrace_func_command *cmd); 1128 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1129 1130 void ftrace_create_filter_files(struct ftrace_ops *ops, 1131 struct dentry *parent); 1132 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1133 #else 1134 struct ftrace_func_command; 1135 1136 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1137 { 1138 return -EINVAL; 1139 } 1140 static inline __init int unregister_ftrace_command(char *cmd_name) 1141 { 1142 return -EINVAL; 1143 } 1144 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1145 { 1146 } 1147 1148 /* 1149 * The ops parameter passed in is usually undefined. 1150 * This must be a macro. 1151 */ 1152 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1153 #define ftrace_destroy_filter_files(ops) do { } while (0) 1154 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1155 1156 bool ftrace_event_is_function(struct trace_event_call *call); 1157 1158 /* 1159 * struct trace_parser - servers for reading the user input separated by spaces 1160 * @cont: set if the input is not complete - no final space char was found 1161 * @buffer: holds the parsed user input 1162 * @idx: user input length 1163 * @size: buffer size 1164 */ 1165 struct trace_parser { 1166 bool cont; 1167 char *buffer; 1168 unsigned idx; 1169 unsigned size; 1170 }; 1171 1172 static inline bool trace_parser_loaded(struct trace_parser *parser) 1173 { 1174 return (parser->idx != 0); 1175 } 1176 1177 static inline bool trace_parser_cont(struct trace_parser *parser) 1178 { 1179 return parser->cont; 1180 } 1181 1182 static inline void trace_parser_clear(struct trace_parser *parser) 1183 { 1184 parser->cont = false; 1185 parser->idx = 0; 1186 } 1187 1188 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1189 extern void trace_parser_put(struct trace_parser *parser); 1190 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1191 size_t cnt, loff_t *ppos); 1192 1193 /* 1194 * Only create function graph options if function graph is configured. 1195 */ 1196 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1197 # define FGRAPH_FLAGS \ 1198 C(DISPLAY_GRAPH, "display-graph"), 1199 #else 1200 # define FGRAPH_FLAGS 1201 #endif 1202 1203 #ifdef CONFIG_BRANCH_TRACER 1204 # define BRANCH_FLAGS \ 1205 C(BRANCH, "branch"), 1206 #else 1207 # define BRANCH_FLAGS 1208 #endif 1209 1210 #ifdef CONFIG_FUNCTION_TRACER 1211 # define FUNCTION_FLAGS \ 1212 C(FUNCTION, "function-trace"), \ 1213 C(FUNC_FORK, "function-fork"), 1214 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1215 #else 1216 # define FUNCTION_FLAGS 1217 # define FUNCTION_DEFAULT_FLAGS 0UL 1218 # define TRACE_ITER_FUNC_FORK 0UL 1219 #endif 1220 1221 #ifdef CONFIG_STACKTRACE 1222 # define STACK_FLAGS \ 1223 C(STACKTRACE, "stacktrace"), 1224 #else 1225 # define STACK_FLAGS 1226 #endif 1227 1228 /* 1229 * trace_iterator_flags is an enumeration that defines bit 1230 * positions into trace_flags that controls the output. 1231 * 1232 * NOTE: These bits must match the trace_options array in 1233 * trace.c (this macro guarantees it). 1234 */ 1235 #define TRACE_FLAGS \ 1236 C(PRINT_PARENT, "print-parent"), \ 1237 C(SYM_OFFSET, "sym-offset"), \ 1238 C(SYM_ADDR, "sym-addr"), \ 1239 C(VERBOSE, "verbose"), \ 1240 C(RAW, "raw"), \ 1241 C(HEX, "hex"), \ 1242 C(BIN, "bin"), \ 1243 C(BLOCK, "block"), \ 1244 C(PRINTK, "trace_printk"), \ 1245 C(ANNOTATE, "annotate"), \ 1246 C(USERSTACKTRACE, "userstacktrace"), \ 1247 C(SYM_USEROBJ, "sym-userobj"), \ 1248 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1249 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1250 C(LATENCY_FMT, "latency-format"), \ 1251 C(RECORD_CMD, "record-cmd"), \ 1252 C(RECORD_TGID, "record-tgid"), \ 1253 C(OVERWRITE, "overwrite"), \ 1254 C(STOP_ON_FREE, "disable_on_free"), \ 1255 C(IRQ_INFO, "irq-info"), \ 1256 C(MARKERS, "markers"), \ 1257 C(EVENT_FORK, "event-fork"), \ 1258 FUNCTION_FLAGS \ 1259 FGRAPH_FLAGS \ 1260 STACK_FLAGS \ 1261 BRANCH_FLAGS 1262 1263 /* 1264 * By defining C, we can make TRACE_FLAGS a list of bit names 1265 * that will define the bits for the flag masks. 1266 */ 1267 #undef C 1268 #define C(a, b) TRACE_ITER_##a##_BIT 1269 1270 enum trace_iterator_bits { 1271 TRACE_FLAGS 1272 /* Make sure we don't go more than we have bits for */ 1273 TRACE_ITER_LAST_BIT 1274 }; 1275 1276 /* 1277 * By redefining C, we can make TRACE_FLAGS a list of masks that 1278 * use the bits as defined above. 1279 */ 1280 #undef C 1281 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1282 1283 enum trace_iterator_flags { TRACE_FLAGS }; 1284 1285 /* 1286 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1287 * control the output of kernel symbols. 1288 */ 1289 #define TRACE_ITER_SYM_MASK \ 1290 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1291 1292 extern struct tracer nop_trace; 1293 1294 #ifdef CONFIG_BRANCH_TRACER 1295 extern int enable_branch_tracing(struct trace_array *tr); 1296 extern void disable_branch_tracing(void); 1297 static inline int trace_branch_enable(struct trace_array *tr) 1298 { 1299 if (tr->trace_flags & TRACE_ITER_BRANCH) 1300 return enable_branch_tracing(tr); 1301 return 0; 1302 } 1303 static inline void trace_branch_disable(void) 1304 { 1305 /* due to races, always disable */ 1306 disable_branch_tracing(); 1307 } 1308 #else 1309 static inline int trace_branch_enable(struct trace_array *tr) 1310 { 1311 return 0; 1312 } 1313 static inline void trace_branch_disable(void) 1314 { 1315 } 1316 #endif /* CONFIG_BRANCH_TRACER */ 1317 1318 /* set ring buffers to default size if not already done so */ 1319 int tracing_update_buffers(void); 1320 1321 struct ftrace_event_field { 1322 struct list_head link; 1323 const char *name; 1324 const char *type; 1325 int filter_type; 1326 int offset; 1327 int size; 1328 int is_signed; 1329 }; 1330 1331 struct prog_entry; 1332 1333 struct event_filter { 1334 struct prog_entry __rcu *prog; 1335 char *filter_string; 1336 }; 1337 1338 struct event_subsystem { 1339 struct list_head list; 1340 const char *name; 1341 struct event_filter *filter; 1342 int ref_count; 1343 }; 1344 1345 struct trace_subsystem_dir { 1346 struct list_head list; 1347 struct event_subsystem *subsystem; 1348 struct trace_array *tr; 1349 struct dentry *entry; 1350 int ref_count; 1351 int nr_events; 1352 }; 1353 1354 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1355 struct ring_buffer *buffer, 1356 struct ring_buffer_event *event); 1357 1358 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1359 struct ring_buffer *buffer, 1360 struct ring_buffer_event *event, 1361 unsigned long flags, int pc, 1362 struct pt_regs *regs); 1363 1364 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1365 struct ring_buffer *buffer, 1366 struct ring_buffer_event *event, 1367 unsigned long flags, int pc) 1368 { 1369 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL); 1370 } 1371 1372 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1373 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1374 void trace_buffered_event_disable(void); 1375 void trace_buffered_event_enable(void); 1376 1377 static inline void 1378 __trace_event_discard_commit(struct ring_buffer *buffer, 1379 struct ring_buffer_event *event) 1380 { 1381 if (this_cpu_read(trace_buffered_event) == event) { 1382 /* Simply release the temp buffer */ 1383 this_cpu_dec(trace_buffered_event_cnt); 1384 return; 1385 } 1386 ring_buffer_discard_commit(buffer, event); 1387 } 1388 1389 /* 1390 * Helper function for event_trigger_unlock_commit{_regs}(). 1391 * If there are event triggers attached to this event that requires 1392 * filtering against its fields, then they wil be called as the 1393 * entry already holds the field information of the current event. 1394 * 1395 * It also checks if the event should be discarded or not. 1396 * It is to be discarded if the event is soft disabled and the 1397 * event was only recorded to process triggers, or if the event 1398 * filter is active and this event did not match the filters. 1399 * 1400 * Returns true if the event is discarded, false otherwise. 1401 */ 1402 static inline bool 1403 __event_trigger_test_discard(struct trace_event_file *file, 1404 struct ring_buffer *buffer, 1405 struct ring_buffer_event *event, 1406 void *entry, 1407 enum event_trigger_type *tt) 1408 { 1409 unsigned long eflags = file->flags; 1410 1411 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1412 *tt = event_triggers_call(file, entry, event); 1413 1414 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || 1415 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && 1416 !filter_match_preds(file->filter, entry))) { 1417 __trace_event_discard_commit(buffer, event); 1418 return true; 1419 } 1420 1421 return false; 1422 } 1423 1424 /** 1425 * event_trigger_unlock_commit - handle triggers and finish event commit 1426 * @file: The file pointer assoctiated to the event 1427 * @buffer: The ring buffer that the event is being written to 1428 * @event: The event meta data in the ring buffer 1429 * @entry: The event itself 1430 * @irq_flags: The state of the interrupts at the start of the event 1431 * @pc: The state of the preempt count at the start of the event. 1432 * 1433 * This is a helper function to handle triggers that require data 1434 * from the event itself. It also tests the event against filters and 1435 * if the event is soft disabled and should be discarded. 1436 */ 1437 static inline void 1438 event_trigger_unlock_commit(struct trace_event_file *file, 1439 struct ring_buffer *buffer, 1440 struct ring_buffer_event *event, 1441 void *entry, unsigned long irq_flags, int pc) 1442 { 1443 enum event_trigger_type tt = ETT_NONE; 1444 1445 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1446 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc); 1447 1448 if (tt) 1449 event_triggers_post_call(file, tt); 1450 } 1451 1452 /** 1453 * event_trigger_unlock_commit_regs - handle triggers and finish event commit 1454 * @file: The file pointer assoctiated to the event 1455 * @buffer: The ring buffer that the event is being written to 1456 * @event: The event meta data in the ring buffer 1457 * @entry: The event itself 1458 * @irq_flags: The state of the interrupts at the start of the event 1459 * @pc: The state of the preempt count at the start of the event. 1460 * 1461 * This is a helper function to handle triggers that require data 1462 * from the event itself. It also tests the event against filters and 1463 * if the event is soft disabled and should be discarded. 1464 * 1465 * Same as event_trigger_unlock_commit() but calls 1466 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). 1467 */ 1468 static inline void 1469 event_trigger_unlock_commit_regs(struct trace_event_file *file, 1470 struct ring_buffer *buffer, 1471 struct ring_buffer_event *event, 1472 void *entry, unsigned long irq_flags, int pc, 1473 struct pt_regs *regs) 1474 { 1475 enum event_trigger_type tt = ETT_NONE; 1476 1477 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1478 trace_buffer_unlock_commit_regs(file->tr, buffer, event, 1479 irq_flags, pc, regs); 1480 1481 if (tt) 1482 event_triggers_post_call(file, tt); 1483 } 1484 1485 #define FILTER_PRED_INVALID ((unsigned short)-1) 1486 #define FILTER_PRED_IS_RIGHT (1 << 15) 1487 #define FILTER_PRED_FOLD (1 << 15) 1488 1489 /* 1490 * The max preds is the size of unsigned short with 1491 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1492 * and FOLD flags. The other is reserved. 1493 * 1494 * 2^14 preds is way more than enough. 1495 */ 1496 #define MAX_FILTER_PRED 16384 1497 1498 struct filter_pred; 1499 struct regex; 1500 1501 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1502 1503 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1504 1505 enum regex_type { 1506 MATCH_FULL = 0, 1507 MATCH_FRONT_ONLY, 1508 MATCH_MIDDLE_ONLY, 1509 MATCH_END_ONLY, 1510 MATCH_GLOB, 1511 MATCH_INDEX, 1512 }; 1513 1514 struct regex { 1515 char pattern[MAX_FILTER_STR_VAL]; 1516 int len; 1517 int field_len; 1518 regex_match_func match; 1519 }; 1520 1521 struct filter_pred { 1522 filter_pred_fn_t fn; 1523 u64 val; 1524 struct regex regex; 1525 unsigned short *ops; 1526 struct ftrace_event_field *field; 1527 int offset; 1528 int not; 1529 int op; 1530 }; 1531 1532 static inline bool is_string_field(struct ftrace_event_field *field) 1533 { 1534 return field->filter_type == FILTER_DYN_STRING || 1535 field->filter_type == FILTER_STATIC_STRING || 1536 field->filter_type == FILTER_PTR_STRING || 1537 field->filter_type == FILTER_COMM; 1538 } 1539 1540 static inline bool is_function_field(struct ftrace_event_field *field) 1541 { 1542 return field->filter_type == FILTER_TRACE_FN; 1543 } 1544 1545 extern enum regex_type 1546 filter_parse_regex(char *buff, int len, char **search, int *not); 1547 extern void print_event_filter(struct trace_event_file *file, 1548 struct trace_seq *s); 1549 extern int apply_event_filter(struct trace_event_file *file, 1550 char *filter_string); 1551 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1552 char *filter_string); 1553 extern void print_subsystem_event_filter(struct event_subsystem *system, 1554 struct trace_seq *s); 1555 extern int filter_assign_type(const char *type); 1556 extern int create_event_filter(struct trace_event_call *call, 1557 char *filter_str, bool set_str, 1558 struct event_filter **filterp); 1559 extern void free_event_filter(struct event_filter *filter); 1560 1561 struct ftrace_event_field * 1562 trace_find_event_field(struct trace_event_call *call, char *name); 1563 1564 extern void trace_event_enable_cmd_record(bool enable); 1565 extern void trace_event_enable_tgid_record(bool enable); 1566 1567 extern int event_trace_init(void); 1568 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1569 extern int event_trace_del_tracer(struct trace_array *tr); 1570 1571 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1572 const char *system, 1573 const char *event); 1574 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1575 const char *system, 1576 const char *event); 1577 1578 static inline void *event_file_data(struct file *filp) 1579 { 1580 return READ_ONCE(file_inode(filp)->i_private); 1581 } 1582 1583 extern struct mutex event_mutex; 1584 extern struct list_head ftrace_events; 1585 1586 extern const struct file_operations event_trigger_fops; 1587 extern const struct file_operations event_hist_fops; 1588 1589 #ifdef CONFIG_HIST_TRIGGERS 1590 extern int register_trigger_hist_cmd(void); 1591 extern int register_trigger_hist_enable_disable_cmds(void); 1592 #else 1593 static inline int register_trigger_hist_cmd(void) { return 0; } 1594 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1595 #endif 1596 1597 extern int register_trigger_cmds(void); 1598 extern void clear_event_triggers(struct trace_array *tr); 1599 1600 struct event_trigger_data { 1601 unsigned long count; 1602 int ref; 1603 struct event_trigger_ops *ops; 1604 struct event_command *cmd_ops; 1605 struct event_filter __rcu *filter; 1606 char *filter_str; 1607 void *private_data; 1608 bool paused; 1609 bool paused_tmp; 1610 struct list_head list; 1611 char *name; 1612 struct list_head named_list; 1613 struct event_trigger_data *named_data; 1614 }; 1615 1616 /* Avoid typos */ 1617 #define ENABLE_EVENT_STR "enable_event" 1618 #define DISABLE_EVENT_STR "disable_event" 1619 #define ENABLE_HIST_STR "enable_hist" 1620 #define DISABLE_HIST_STR "disable_hist" 1621 1622 struct enable_trigger_data { 1623 struct trace_event_file *file; 1624 bool enable; 1625 bool hist; 1626 }; 1627 1628 extern int event_enable_trigger_print(struct seq_file *m, 1629 struct event_trigger_ops *ops, 1630 struct event_trigger_data *data); 1631 extern void event_enable_trigger_free(struct event_trigger_ops *ops, 1632 struct event_trigger_data *data); 1633 extern int event_enable_trigger_func(struct event_command *cmd_ops, 1634 struct trace_event_file *file, 1635 char *glob, char *cmd, char *param); 1636 extern int event_enable_register_trigger(char *glob, 1637 struct event_trigger_ops *ops, 1638 struct event_trigger_data *data, 1639 struct trace_event_file *file); 1640 extern void event_enable_unregister_trigger(char *glob, 1641 struct event_trigger_ops *ops, 1642 struct event_trigger_data *test, 1643 struct trace_event_file *file); 1644 extern void trigger_data_free(struct event_trigger_data *data); 1645 extern int event_trigger_init(struct event_trigger_ops *ops, 1646 struct event_trigger_data *data); 1647 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1648 int trigger_enable); 1649 extern void update_cond_flag(struct trace_event_file *file); 1650 extern int set_trigger_filter(char *filter_str, 1651 struct event_trigger_data *trigger_data, 1652 struct trace_event_file *file); 1653 extern struct event_trigger_data *find_named_trigger(const char *name); 1654 extern bool is_named_trigger(struct event_trigger_data *test); 1655 extern int save_named_trigger(const char *name, 1656 struct event_trigger_data *data); 1657 extern void del_named_trigger(struct event_trigger_data *data); 1658 extern void pause_named_trigger(struct event_trigger_data *data); 1659 extern void unpause_named_trigger(struct event_trigger_data *data); 1660 extern void set_named_trigger_data(struct event_trigger_data *data, 1661 struct event_trigger_data *named_data); 1662 extern struct event_trigger_data * 1663 get_named_trigger_data(struct event_trigger_data *data); 1664 extern int register_event_command(struct event_command *cmd); 1665 extern int unregister_event_command(struct event_command *cmd); 1666 extern int register_trigger_hist_enable_disable_cmds(void); 1667 1668 /** 1669 * struct event_trigger_ops - callbacks for trace event triggers 1670 * 1671 * The methods in this structure provide per-event trigger hooks for 1672 * various trigger operations. 1673 * 1674 * All the methods below, except for @init() and @free(), must be 1675 * implemented. 1676 * 1677 * @func: The trigger 'probe' function called when the triggering 1678 * event occurs. The data passed into this callback is the data 1679 * that was supplied to the event_command @reg() function that 1680 * registered the trigger (see struct event_command) along with 1681 * the trace record, rec. 1682 * 1683 * @init: An optional initialization function called for the trigger 1684 * when the trigger is registered (via the event_command reg() 1685 * function). This can be used to perform per-trigger 1686 * initialization such as incrementing a per-trigger reference 1687 * count, for instance. This is usually implemented by the 1688 * generic utility function @event_trigger_init() (see 1689 * trace_event_triggers.c). 1690 * 1691 * @free: An optional de-initialization function called for the 1692 * trigger when the trigger is unregistered (via the 1693 * event_command @reg() function). This can be used to perform 1694 * per-trigger de-initialization such as decrementing a 1695 * per-trigger reference count and freeing corresponding trigger 1696 * data, for instance. This is usually implemented by the 1697 * generic utility function @event_trigger_free() (see 1698 * trace_event_triggers.c). 1699 * 1700 * @print: The callback function invoked to have the trigger print 1701 * itself. This is usually implemented by a wrapper function 1702 * that calls the generic utility function @event_trigger_print() 1703 * (see trace_event_triggers.c). 1704 */ 1705 struct event_trigger_ops { 1706 void (*func)(struct event_trigger_data *data, 1707 void *rec, 1708 struct ring_buffer_event *rbe); 1709 int (*init)(struct event_trigger_ops *ops, 1710 struct event_trigger_data *data); 1711 void (*free)(struct event_trigger_ops *ops, 1712 struct event_trigger_data *data); 1713 int (*print)(struct seq_file *m, 1714 struct event_trigger_ops *ops, 1715 struct event_trigger_data *data); 1716 }; 1717 1718 /** 1719 * struct event_command - callbacks and data members for event commands 1720 * 1721 * Event commands are invoked by users by writing the command name 1722 * into the 'trigger' file associated with a trace event. The 1723 * parameters associated with a specific invocation of an event 1724 * command are used to create an event trigger instance, which is 1725 * added to the list of trigger instances associated with that trace 1726 * event. When the event is hit, the set of triggers associated with 1727 * that event is invoked. 1728 * 1729 * The data members in this structure provide per-event command data 1730 * for various event commands. 1731 * 1732 * All the data members below, except for @post_trigger, must be set 1733 * for each event command. 1734 * 1735 * @name: The unique name that identifies the event command. This is 1736 * the name used when setting triggers via trigger files. 1737 * 1738 * @trigger_type: A unique id that identifies the event command 1739 * 'type'. This value has two purposes, the first to ensure that 1740 * only one trigger of the same type can be set at a given time 1741 * for a particular event e.g. it doesn't make sense to have both 1742 * a traceon and traceoff trigger attached to a single event at 1743 * the same time, so traceon and traceoff have the same type 1744 * though they have different names. The @trigger_type value is 1745 * also used as a bit value for deferring the actual trigger 1746 * action until after the current event is finished. Some 1747 * commands need to do this if they themselves log to the trace 1748 * buffer (see the @post_trigger() member below). @trigger_type 1749 * values are defined by adding new values to the trigger_type 1750 * enum in include/linux/trace_events.h. 1751 * 1752 * @flags: See the enum event_command_flags below. 1753 * 1754 * All the methods below, except for @set_filter() and @unreg_all(), 1755 * must be implemented. 1756 * 1757 * @func: The callback function responsible for parsing and 1758 * registering the trigger written to the 'trigger' file by the 1759 * user. It allocates the trigger instance and registers it with 1760 * the appropriate trace event. It makes use of the other 1761 * event_command callback functions to orchestrate this, and is 1762 * usually implemented by the generic utility function 1763 * @event_trigger_callback() (see trace_event_triggers.c). 1764 * 1765 * @reg: Adds the trigger to the list of triggers associated with the 1766 * event, and enables the event trigger itself, after 1767 * initializing it (via the event_trigger_ops @init() function). 1768 * This is also where commands can use the @trigger_type value to 1769 * make the decision as to whether or not multiple instances of 1770 * the trigger should be allowed. This is usually implemented by 1771 * the generic utility function @register_trigger() (see 1772 * trace_event_triggers.c). 1773 * 1774 * @unreg: Removes the trigger from the list of triggers associated 1775 * with the event, and disables the event trigger itself, after 1776 * initializing it (via the event_trigger_ops @free() function). 1777 * This is usually implemented by the generic utility function 1778 * @unregister_trigger() (see trace_event_triggers.c). 1779 * 1780 * @unreg_all: An optional function called to remove all the triggers 1781 * from the list of triggers associated with the event. Called 1782 * when a trigger file is opened in truncate mode. 1783 * 1784 * @set_filter: An optional function called to parse and set a filter 1785 * for the trigger. If no @set_filter() method is set for the 1786 * event command, filters set by the user for the command will be 1787 * ignored. This is usually implemented by the generic utility 1788 * function @set_trigger_filter() (see trace_event_triggers.c). 1789 * 1790 * @get_trigger_ops: The callback function invoked to retrieve the 1791 * event_trigger_ops implementation associated with the command. 1792 */ 1793 struct event_command { 1794 struct list_head list; 1795 char *name; 1796 enum event_trigger_type trigger_type; 1797 int flags; 1798 int (*func)(struct event_command *cmd_ops, 1799 struct trace_event_file *file, 1800 char *glob, char *cmd, char *params); 1801 int (*reg)(char *glob, 1802 struct event_trigger_ops *ops, 1803 struct event_trigger_data *data, 1804 struct trace_event_file *file); 1805 void (*unreg)(char *glob, 1806 struct event_trigger_ops *ops, 1807 struct event_trigger_data *data, 1808 struct trace_event_file *file); 1809 void (*unreg_all)(struct trace_event_file *file); 1810 int (*set_filter)(char *filter_str, 1811 struct event_trigger_data *data, 1812 struct trace_event_file *file); 1813 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1814 }; 1815 1816 /** 1817 * enum event_command_flags - flags for struct event_command 1818 * 1819 * @POST_TRIGGER: A flag that says whether or not this command needs 1820 * to have its action delayed until after the current event has 1821 * been closed. Some triggers need to avoid being invoked while 1822 * an event is currently in the process of being logged, since 1823 * the trigger may itself log data into the trace buffer. Thus 1824 * we make sure the current event is committed before invoking 1825 * those triggers. To do that, the trigger invocation is split 1826 * in two - the first part checks the filter using the current 1827 * trace record; if a command has the @post_trigger flag set, it 1828 * sets a bit for itself in the return value, otherwise it 1829 * directly invokes the trigger. Once all commands have been 1830 * either invoked or set their return flag, the current record is 1831 * either committed or discarded. At that point, if any commands 1832 * have deferred their triggers, those commands are finally 1833 * invoked following the close of the current event. In other 1834 * words, if the event_trigger_ops @func() probe implementation 1835 * itself logs to the trace buffer, this flag should be set, 1836 * otherwise it can be left unspecified. 1837 * 1838 * @NEEDS_REC: A flag that says whether or not this command needs 1839 * access to the trace record in order to perform its function, 1840 * regardless of whether or not it has a filter associated with 1841 * it (filters make a trigger require access to the trace record 1842 * but are not always present). 1843 */ 1844 enum event_command_flags { 1845 EVENT_CMD_FL_POST_TRIGGER = 1, 1846 EVENT_CMD_FL_NEEDS_REC = 2, 1847 }; 1848 1849 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1850 { 1851 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1852 } 1853 1854 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1855 { 1856 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1857 } 1858 1859 extern int trace_event_enable_disable(struct trace_event_file *file, 1860 int enable, int soft_disable); 1861 extern int tracing_alloc_snapshot(void); 1862 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1863 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1864 1865 extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1866 extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1867 1868 extern const char *__start___trace_bprintk_fmt[]; 1869 extern const char *__stop___trace_bprintk_fmt[]; 1870 1871 extern const char *__start___tracepoint_str[]; 1872 extern const char *__stop___tracepoint_str[]; 1873 1874 void trace_printk_control(bool enabled); 1875 void trace_printk_init_buffers(void); 1876 void trace_printk_start_comm(void); 1877 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1878 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1879 1880 #define MAX_EVENT_NAME_LEN 64 1881 1882 extern int trace_run_command(const char *buf, int (*createfn)(int, char**)); 1883 extern ssize_t trace_parse_run_command(struct file *file, 1884 const char __user *buffer, size_t count, loff_t *ppos, 1885 int (*createfn)(int, char**)); 1886 1887 /* 1888 * Normal trace_printk() and friends allocates special buffers 1889 * to do the manipulation, as well as saves the print formats 1890 * into sections to display. But the trace infrastructure wants 1891 * to use these without the added overhead at the price of being 1892 * a bit slower (used mainly for warnings, where we don't care 1893 * about performance). The internal_trace_puts() is for such 1894 * a purpose. 1895 */ 1896 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1897 1898 #undef FTRACE_ENTRY 1899 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1900 extern struct trace_event_call \ 1901 __aligned(4) event_##call; 1902 #undef FTRACE_ENTRY_DUP 1903 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1904 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1905 filter) 1906 #undef FTRACE_ENTRY_PACKED 1907 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \ 1908 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1909 filter) 1910 1911 #include "trace_entries.h" 1912 1913 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1914 int perf_ftrace_event_register(struct trace_event_call *call, 1915 enum trace_reg type, void *data); 1916 #else 1917 #define perf_ftrace_event_register NULL 1918 #endif 1919 1920 #ifdef CONFIG_FTRACE_SYSCALLS 1921 void init_ftrace_syscalls(void); 1922 const char *get_syscall_name(int syscall); 1923 #else 1924 static inline void init_ftrace_syscalls(void) { } 1925 static inline const char *get_syscall_name(int syscall) 1926 { 1927 return NULL; 1928 } 1929 #endif 1930 1931 #ifdef CONFIG_EVENT_TRACING 1932 void trace_event_init(void); 1933 void trace_event_eval_update(struct trace_eval_map **map, int len); 1934 #else 1935 static inline void __init trace_event_init(void) { } 1936 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1937 #endif 1938 1939 #ifdef CONFIG_TRACER_SNAPSHOT 1940 void tracing_snapshot_instance(struct trace_array *tr); 1941 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1942 #else 1943 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1944 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1945 { 1946 return 0; 1947 } 1948 #endif 1949 1950 #ifdef CONFIG_PREEMPT_TRACER 1951 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1952 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1953 #else 1954 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1955 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1956 #endif 1957 #ifdef CONFIG_IRQSOFF_TRACER 1958 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1959 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1960 #else 1961 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1962 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1963 #endif 1964 1965 extern struct trace_iterator *tracepoint_print_iter; 1966 1967 #endif /* _LINUX_KERNEL_TRACE_H */ 1968