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/glob.h> 19 #include <linux/irq_work.h> 20 #include <linux/workqueue.h> 21 22 #ifdef CONFIG_FTRACE_SYSCALLS 23 #include <asm/unistd.h> /* For NR_SYSCALLS */ 24 #include <asm/syscall.h> /* some archs define it here */ 25 #endif 26 27 enum trace_type { 28 __TRACE_FIRST_TYPE = 0, 29 30 TRACE_FN, 31 TRACE_CTX, 32 TRACE_WAKE, 33 TRACE_STACK, 34 TRACE_PRINT, 35 TRACE_BPRINT, 36 TRACE_MMIO_RW, 37 TRACE_MMIO_MAP, 38 TRACE_BRANCH, 39 TRACE_GRAPH_RET, 40 TRACE_GRAPH_ENT, 41 TRACE_USER_STACK, 42 TRACE_BLK, 43 TRACE_BPUTS, 44 TRACE_HWLAT, 45 TRACE_RAW_DATA, 46 47 __TRACE_LAST_TYPE, 48 }; 49 50 51 #undef __field 52 #define __field(type, item) type item; 53 54 #undef __field_struct 55 #define __field_struct(type, item) __field(type, item) 56 57 #undef __field_desc 58 #define __field_desc(type, container, item) 59 60 #undef __array 61 #define __array(type, item, size) type item[size]; 62 63 #undef __array_desc 64 #define __array_desc(type, container, item, size) 65 66 #undef __dynamic_array 67 #define __dynamic_array(type, item) type item[]; 68 69 #undef F_STRUCT 70 #define F_STRUCT(args...) args 71 72 #undef FTRACE_ENTRY 73 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 74 struct struct_name { \ 75 struct trace_entry ent; \ 76 tstruct \ 77 } 78 79 #undef FTRACE_ENTRY_DUP 80 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) 81 82 #undef FTRACE_ENTRY_REG 83 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 84 filter, regfn) \ 85 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 86 filter) 87 88 #undef FTRACE_ENTRY_PACKED 89 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \ 90 filter) \ 91 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 92 filter) __packed 93 94 #include "trace_entries.h" 95 96 /* 97 * syscalls are special, and need special handling, this is why 98 * they are not included in trace_entries.h 99 */ 100 struct syscall_trace_enter { 101 struct trace_entry ent; 102 int nr; 103 unsigned long args[]; 104 }; 105 106 struct syscall_trace_exit { 107 struct trace_entry ent; 108 int nr; 109 long ret; 110 }; 111 112 struct kprobe_trace_entry_head { 113 struct trace_entry ent; 114 unsigned long ip; 115 }; 116 117 struct kretprobe_trace_entry_head { 118 struct trace_entry ent; 119 unsigned long func; 120 unsigned long ret_ip; 121 }; 122 123 /* 124 * trace_flag_type is an enumeration that holds different 125 * states when a trace occurs. These are: 126 * IRQS_OFF - interrupts were disabled 127 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 128 * NEED_RESCHED - reschedule is requested 129 * HARDIRQ - inside an interrupt handler 130 * SOFTIRQ - inside a softirq handler 131 */ 132 enum trace_flag_type { 133 TRACE_FLAG_IRQS_OFF = 0x01, 134 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 135 TRACE_FLAG_NEED_RESCHED = 0x04, 136 TRACE_FLAG_HARDIRQ = 0x08, 137 TRACE_FLAG_SOFTIRQ = 0x10, 138 TRACE_FLAG_PREEMPT_RESCHED = 0x20, 139 TRACE_FLAG_NMI = 0x40, 140 }; 141 142 #define TRACE_BUF_SIZE 1024 143 144 struct trace_array; 145 146 /* 147 * The CPU trace array - it consists of thousands of trace entries 148 * plus some other descriptor data: (for example which task started 149 * the trace, etc.) 150 */ 151 struct trace_array_cpu { 152 atomic_t disabled; 153 void *buffer_page; /* ring buffer spare */ 154 155 unsigned long entries; 156 unsigned long saved_latency; 157 unsigned long critical_start; 158 unsigned long critical_end; 159 unsigned long critical_sequence; 160 unsigned long nice; 161 unsigned long policy; 162 unsigned long rt_priority; 163 unsigned long skipped_entries; 164 u64 preempt_timestamp; 165 pid_t pid; 166 kuid_t uid; 167 char comm[TASK_COMM_LEN]; 168 169 bool ignore_pid; 170 #ifdef CONFIG_FUNCTION_TRACER 171 bool ftrace_ignore_pid; 172 #endif 173 }; 174 175 struct tracer; 176 struct trace_option_dentry; 177 178 struct trace_buffer { 179 struct trace_array *tr; 180 struct ring_buffer *buffer; 181 struct trace_array_cpu __percpu *data; 182 u64 time_start; 183 int cpu; 184 }; 185 186 #define TRACE_FLAGS_MAX_SIZE 32 187 188 struct trace_options { 189 struct tracer *tracer; 190 struct trace_option_dentry *topts; 191 }; 192 193 struct trace_pid_list { 194 int pid_max; 195 unsigned long *pids; 196 }; 197 198 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 199 200 /** 201 * struct cond_snapshot - conditional snapshot data and callback 202 * 203 * The cond_snapshot structure encapsulates a callback function and 204 * data associated with the snapshot for a given tracing instance. 205 * 206 * When a snapshot is taken conditionally, by invoking 207 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 208 * passed in turn to the cond_snapshot.update() function. That data 209 * can be compared by the update() implementation with the cond_data 210 * contained wihin the struct cond_snapshot instance associated with 211 * the trace_array. Because the tr->max_lock is held throughout the 212 * update() call, the update() function can directly retrieve the 213 * cond_snapshot and cond_data associated with the per-instance 214 * snapshot associated with the trace_array. 215 * 216 * The cond_snapshot.update() implementation can save data to be 217 * associated with the snapshot if it decides to, and returns 'true' 218 * in that case, or it returns 'false' if the conditional snapshot 219 * shouldn't be taken. 220 * 221 * The cond_snapshot instance is created and associated with the 222 * user-defined cond_data by tracing_cond_snapshot_enable(). 223 * Likewise, the cond_snapshot instance is destroyed and is no longer 224 * associated with the trace instance by 225 * tracing_cond_snapshot_disable(). 226 * 227 * The method below is required. 228 * 229 * @update: When a conditional snapshot is invoked, the update() 230 * callback function is invoked with the tr->max_lock held. The 231 * update() implementation signals whether or not to actually 232 * take the snapshot, by returning 'true' if so, 'false' if no 233 * snapshot should be taken. Because the max_lock is held for 234 * the duration of update(), the implementation is safe to 235 * directly retrieven and save any implementation data it needs 236 * to in association with the snapshot. 237 */ 238 struct cond_snapshot { 239 void *cond_data; 240 cond_update_fn_t update; 241 }; 242 243 /* 244 * The trace array - an array of per-CPU trace arrays. This is the 245 * highest level data structure that individual tracers deal with. 246 * They have on/off state as well: 247 */ 248 struct trace_array { 249 struct list_head list; 250 char *name; 251 struct trace_buffer trace_buffer; 252 #ifdef CONFIG_TRACER_MAX_TRACE 253 /* 254 * The max_buffer is used to snapshot the trace when a maximum 255 * latency is reached, or when the user initiates a snapshot. 256 * Some tracers will use this to store a maximum trace while 257 * it continues examining live traces. 258 * 259 * The buffers for the max_buffer are set up the same as the trace_buffer 260 * When a snapshot is taken, the buffer of the max_buffer is swapped 261 * with the buffer of the trace_buffer and the buffers are reset for 262 * the trace_buffer so the tracing can continue. 263 */ 264 struct trace_buffer max_buffer; 265 bool allocated_snapshot; 266 #endif 267 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) 268 unsigned long max_latency; 269 #ifdef CONFIG_FSNOTIFY 270 struct dentry *d_max_latency; 271 struct work_struct fsnotify_work; 272 struct irq_work fsnotify_irqwork; 273 #endif 274 #endif 275 struct trace_pid_list __rcu *filtered_pids; 276 /* 277 * max_lock is used to protect the swapping of buffers 278 * when taking a max snapshot. The buffers themselves are 279 * protected by per_cpu spinlocks. But the action of the swap 280 * needs its own lock. 281 * 282 * This is defined as a arch_spinlock_t in order to help 283 * with performance when lockdep debugging is enabled. 284 * 285 * It is also used in other places outside the update_max_tr 286 * so it needs to be defined outside of the 287 * CONFIG_TRACER_MAX_TRACE. 288 */ 289 arch_spinlock_t max_lock; 290 int buffer_disabled; 291 #ifdef CONFIG_FTRACE_SYSCALLS 292 int sys_refcount_enter; 293 int sys_refcount_exit; 294 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 295 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 296 #endif 297 int stop_count; 298 int clock_id; 299 int nr_topts; 300 bool clear_trace; 301 int buffer_percent; 302 unsigned int n_err_log_entries; 303 struct tracer *current_trace; 304 unsigned int trace_flags; 305 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 306 unsigned int flags; 307 raw_spinlock_t start_lock; 308 struct list_head err_log; 309 struct dentry *dir; 310 struct dentry *options; 311 struct dentry *percpu_dir; 312 struct dentry *event_dir; 313 struct trace_options *topts; 314 struct list_head systems; 315 struct list_head events; 316 struct trace_event_file *trace_marker_file; 317 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 318 int ref; 319 #ifdef CONFIG_FUNCTION_TRACER 320 struct ftrace_ops *ops; 321 struct trace_pid_list __rcu *function_pids; 322 #ifdef CONFIG_DYNAMIC_FTRACE 323 /* All of these are protected by the ftrace_lock */ 324 struct list_head func_probes; 325 struct list_head mod_trace; 326 struct list_head mod_notrace; 327 #endif 328 /* function tracing enabled */ 329 int function_enabled; 330 #endif 331 int time_stamp_abs_ref; 332 struct list_head hist_vars; 333 #ifdef CONFIG_TRACER_SNAPSHOT 334 struct cond_snapshot *cond_snapshot; 335 #endif 336 }; 337 338 enum { 339 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 340 }; 341 342 extern struct list_head ftrace_trace_arrays; 343 344 extern struct mutex trace_types_lock; 345 346 extern int trace_array_get(struct trace_array *tr); 347 extern void trace_array_put(struct trace_array *tr); 348 extern int tracing_check_open_get_tr(struct trace_array *tr); 349 350 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs); 351 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 352 353 extern bool trace_clock_in_ns(struct trace_array *tr); 354 355 /* 356 * The global tracer (top) should be the first trace array added, 357 * but we check the flag anyway. 358 */ 359 static inline struct trace_array *top_trace_array(void) 360 { 361 struct trace_array *tr; 362 363 if (list_empty(&ftrace_trace_arrays)) 364 return NULL; 365 366 tr = list_entry(ftrace_trace_arrays.prev, 367 typeof(*tr), list); 368 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 369 return tr; 370 } 371 372 #define FTRACE_CMP_TYPE(var, type) \ 373 __builtin_types_compatible_p(typeof(var), type *) 374 375 #undef IF_ASSIGN 376 #define IF_ASSIGN(var, entry, etype, id) \ 377 if (FTRACE_CMP_TYPE(var, etype)) { \ 378 var = (typeof(var))(entry); \ 379 WARN_ON(id != 0 && (entry)->type != id); \ 380 break; \ 381 } 382 383 /* Will cause compile errors if type is not found. */ 384 extern void __ftrace_bad_type(void); 385 386 /* 387 * The trace_assign_type is a verifier that the entry type is 388 * the same as the type being assigned. To add new types simply 389 * add a line with the following format: 390 * 391 * IF_ASSIGN(var, ent, type, id); 392 * 393 * Where "type" is the trace type that includes the trace_entry 394 * as the "ent" item. And "id" is the trace identifier that is 395 * used in the trace_type enum. 396 * 397 * If the type can have more than one id, then use zero. 398 */ 399 #define trace_assign_type(var, ent) \ 400 do { \ 401 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 402 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 403 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 404 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 405 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 406 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 407 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 408 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 409 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 410 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 411 TRACE_MMIO_RW); \ 412 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 413 TRACE_MMIO_MAP); \ 414 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 415 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 416 TRACE_GRAPH_ENT); \ 417 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 418 TRACE_GRAPH_RET); \ 419 __ftrace_bad_type(); \ 420 } while (0) 421 422 /* 423 * An option specific to a tracer. This is a boolean value. 424 * The bit is the bit index that sets its value on the 425 * flags value in struct tracer_flags. 426 */ 427 struct tracer_opt { 428 const char *name; /* Will appear on the trace_options file */ 429 u32 bit; /* Mask assigned in val field in tracer_flags */ 430 }; 431 432 /* 433 * The set of specific options for a tracer. Your tracer 434 * have to set the initial value of the flags val. 435 */ 436 struct tracer_flags { 437 u32 val; 438 struct tracer_opt *opts; 439 struct tracer *trace; 440 }; 441 442 /* Makes more easy to define a tracer opt */ 443 #define TRACER_OPT(s, b) .name = #s, .bit = b 444 445 446 struct trace_option_dentry { 447 struct tracer_opt *opt; 448 struct tracer_flags *flags; 449 struct trace_array *tr; 450 struct dentry *entry; 451 }; 452 453 /** 454 * struct tracer - a specific tracer and its callbacks to interact with tracefs 455 * @name: the name chosen to select it on the available_tracers file 456 * @init: called when one switches to this tracer (echo name > current_tracer) 457 * @reset: called when one switches to another tracer 458 * @start: called when tracing is unpaused (echo 1 > tracing_on) 459 * @stop: called when tracing is paused (echo 0 > tracing_on) 460 * @update_thresh: called when tracing_thresh is updated 461 * @open: called when the trace file is opened 462 * @pipe_open: called when the trace_pipe file is opened 463 * @close: called when the trace file is released 464 * @pipe_close: called when the trace_pipe file is released 465 * @read: override the default read callback on trace_pipe 466 * @splice_read: override the default splice_read callback on trace_pipe 467 * @selftest: selftest to run on boot (see trace_selftest.c) 468 * @print_headers: override the first lines that describe your columns 469 * @print_line: callback that prints a trace 470 * @set_flag: signals one of your private flags changed (trace_options file) 471 * @flags: your private flags 472 */ 473 struct tracer { 474 const char *name; 475 int (*init)(struct trace_array *tr); 476 void (*reset)(struct trace_array *tr); 477 void (*start)(struct trace_array *tr); 478 void (*stop)(struct trace_array *tr); 479 int (*update_thresh)(struct trace_array *tr); 480 void (*open)(struct trace_iterator *iter); 481 void (*pipe_open)(struct trace_iterator *iter); 482 void (*close)(struct trace_iterator *iter); 483 void (*pipe_close)(struct trace_iterator *iter); 484 ssize_t (*read)(struct trace_iterator *iter, 485 struct file *filp, char __user *ubuf, 486 size_t cnt, loff_t *ppos); 487 ssize_t (*splice_read)(struct trace_iterator *iter, 488 struct file *filp, 489 loff_t *ppos, 490 struct pipe_inode_info *pipe, 491 size_t len, 492 unsigned int flags); 493 #ifdef CONFIG_FTRACE_STARTUP_TEST 494 int (*selftest)(struct tracer *trace, 495 struct trace_array *tr); 496 #endif 497 void (*print_header)(struct seq_file *m); 498 enum print_line_t (*print_line)(struct trace_iterator *iter); 499 /* If you handled the flag setting, return 0 */ 500 int (*set_flag)(struct trace_array *tr, 501 u32 old_flags, u32 bit, int set); 502 /* Return 0 if OK with change, else return non-zero */ 503 int (*flag_changed)(struct trace_array *tr, 504 u32 mask, int set); 505 struct tracer *next; 506 struct tracer_flags *flags; 507 int enabled; 508 int ref; 509 bool print_max; 510 bool allow_instances; 511 #ifdef CONFIG_TRACER_MAX_TRACE 512 bool use_max_tr; 513 #endif 514 /* True if tracer cannot be enabled in kernel param */ 515 bool noboot; 516 }; 517 518 519 /* Only current can touch trace_recursion */ 520 521 /* 522 * For function tracing recursion: 523 * The order of these bits are important. 524 * 525 * When function tracing occurs, the following steps are made: 526 * If arch does not support a ftrace feature: 527 * call internal function (uses INTERNAL bits) which calls... 528 * If callback is registered to the "global" list, the list 529 * function is called and recursion checks the GLOBAL bits. 530 * then this function calls... 531 * The function callback, which can use the FTRACE bits to 532 * check for recursion. 533 * 534 * Now if the arch does not suppport a feature, and it calls 535 * the global list function which calls the ftrace callback 536 * all three of these steps will do a recursion protection. 537 * There's no reason to do one if the previous caller already 538 * did. The recursion that we are protecting against will 539 * go through the same steps again. 540 * 541 * To prevent the multiple recursion checks, if a recursion 542 * bit is set that is higher than the MAX bit of the current 543 * check, then we know that the check was made by the previous 544 * caller, and we can skip the current check. 545 */ 546 enum { 547 TRACE_BUFFER_BIT, 548 TRACE_BUFFER_NMI_BIT, 549 TRACE_BUFFER_IRQ_BIT, 550 TRACE_BUFFER_SIRQ_BIT, 551 552 /* Start of function recursion bits */ 553 TRACE_FTRACE_BIT, 554 TRACE_FTRACE_NMI_BIT, 555 TRACE_FTRACE_IRQ_BIT, 556 TRACE_FTRACE_SIRQ_BIT, 557 558 /* INTERNAL_BITs must be greater than FTRACE_BITs */ 559 TRACE_INTERNAL_BIT, 560 TRACE_INTERNAL_NMI_BIT, 561 TRACE_INTERNAL_IRQ_BIT, 562 TRACE_INTERNAL_SIRQ_BIT, 563 564 TRACE_BRANCH_BIT, 565 /* 566 * Abuse of the trace_recursion. 567 * As we need a way to maintain state if we are tracing the function 568 * graph in irq because we want to trace a particular function that 569 * was called in irq context but we have irq tracing off. Since this 570 * can only be modified by current, we can reuse trace_recursion. 571 */ 572 TRACE_IRQ_BIT, 573 574 /* Set if the function is in the set_graph_function file */ 575 TRACE_GRAPH_BIT, 576 577 /* 578 * In the very unlikely case that an interrupt came in 579 * at a start of graph tracing, and we want to trace 580 * the function in that interrupt, the depth can be greater 581 * than zero, because of the preempted start of a previous 582 * trace. In an even more unlikely case, depth could be 2 583 * if a softirq interrupted the start of graph tracing, 584 * followed by an interrupt preempting a start of graph 585 * tracing in the softirq, and depth can even be 3 586 * if an NMI came in at the start of an interrupt function 587 * that preempted a softirq start of a function that 588 * preempted normal context!!!! Luckily, it can't be 589 * greater than 3, so the next two bits are a mask 590 * of what the depth is when we set TRACE_GRAPH_BIT 591 */ 592 593 TRACE_GRAPH_DEPTH_START_BIT, 594 TRACE_GRAPH_DEPTH_END_BIT, 595 596 /* 597 * To implement set_graph_notrace, if this bit is set, we ignore 598 * function graph tracing of called functions, until the return 599 * function is called to clear it. 600 */ 601 TRACE_GRAPH_NOTRACE_BIT, 602 }; 603 604 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 605 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 606 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 607 608 #define trace_recursion_depth() \ 609 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3) 610 #define trace_recursion_set_depth(depth) \ 611 do { \ 612 current->trace_recursion &= \ 613 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \ 614 current->trace_recursion |= \ 615 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \ 616 } while (0) 617 618 #define TRACE_CONTEXT_BITS 4 619 620 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 621 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 622 623 #define TRACE_LIST_START TRACE_INTERNAL_BIT 624 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 625 626 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 627 628 static __always_inline int trace_get_context_bit(void) 629 { 630 int bit; 631 632 if (in_interrupt()) { 633 if (in_nmi()) 634 bit = 0; 635 636 else if (in_irq()) 637 bit = 1; 638 else 639 bit = 2; 640 } else 641 bit = 3; 642 643 return bit; 644 } 645 646 static __always_inline int trace_test_and_set_recursion(int start, int max) 647 { 648 unsigned int val = current->trace_recursion; 649 int bit; 650 651 /* A previous recursion check was made */ 652 if ((val & TRACE_CONTEXT_MASK) > max) 653 return 0; 654 655 bit = trace_get_context_bit() + start; 656 if (unlikely(val & (1 << bit))) 657 return -1; 658 659 val |= 1 << bit; 660 current->trace_recursion = val; 661 barrier(); 662 663 return bit; 664 } 665 666 static __always_inline void trace_clear_recursion(int bit) 667 { 668 unsigned int val = current->trace_recursion; 669 670 if (!bit) 671 return; 672 673 bit = 1 << bit; 674 val &= ~bit; 675 676 barrier(); 677 current->trace_recursion = val; 678 } 679 680 static inline struct ring_buffer_iter * 681 trace_buffer_iter(struct trace_iterator *iter, int cpu) 682 { 683 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 684 } 685 686 int tracer_init(struct tracer *t, struct trace_array *tr); 687 int tracing_is_enabled(void); 688 void tracing_reset_online_cpus(struct trace_buffer *buf); 689 void tracing_reset_current(int cpu); 690 void tracing_reset_all_online_cpus(void); 691 int tracing_open_generic(struct inode *inode, struct file *filp); 692 int tracing_open_generic_tr(struct inode *inode, struct file *filp); 693 bool tracing_is_disabled(void); 694 bool tracer_tracing_is_on(struct trace_array *tr); 695 void tracer_tracing_on(struct trace_array *tr); 696 void tracer_tracing_off(struct trace_array *tr); 697 struct dentry *trace_create_file(const char *name, 698 umode_t mode, 699 struct dentry *parent, 700 void *data, 701 const struct file_operations *fops); 702 703 struct dentry *tracing_init_dentry(void); 704 705 struct ring_buffer_event; 706 707 struct ring_buffer_event * 708 trace_buffer_lock_reserve(struct ring_buffer *buffer, 709 int type, 710 unsigned long len, 711 unsigned long flags, 712 int pc); 713 714 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 715 struct trace_array_cpu *data); 716 717 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 718 int *ent_cpu, u64 *ent_ts); 719 720 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer, 721 struct ring_buffer_event *event); 722 723 int trace_empty(struct trace_iterator *iter); 724 725 void *trace_find_next_entry_inc(struct trace_iterator *iter); 726 727 void trace_init_global_iter(struct trace_iterator *iter); 728 729 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 730 731 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 732 unsigned long trace_total_entries(struct trace_array *tr); 733 734 void trace_function(struct trace_array *tr, 735 unsigned long ip, 736 unsigned long parent_ip, 737 unsigned long flags, int pc); 738 void trace_graph_function(struct trace_array *tr, 739 unsigned long ip, 740 unsigned long parent_ip, 741 unsigned long flags, int pc); 742 void trace_latency_header(struct seq_file *m); 743 void trace_default_header(struct seq_file *m); 744 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 745 int trace_empty(struct trace_iterator *iter); 746 747 void trace_graph_return(struct ftrace_graph_ret *trace); 748 int trace_graph_entry(struct ftrace_graph_ent *trace); 749 void set_graph_array(struct trace_array *tr); 750 751 void tracing_start_cmdline_record(void); 752 void tracing_stop_cmdline_record(void); 753 void tracing_start_tgid_record(void); 754 void tracing_stop_tgid_record(void); 755 756 int register_tracer(struct tracer *type); 757 int is_tracing_stopped(void); 758 759 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 760 761 extern cpumask_var_t __read_mostly tracing_buffer_mask; 762 763 #define for_each_tracing_cpu(cpu) \ 764 for_each_cpu(cpu, tracing_buffer_mask) 765 766 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 767 768 extern unsigned long tracing_thresh; 769 770 /* PID filtering */ 771 772 extern int pid_max; 773 774 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 775 pid_t search_pid); 776 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 777 struct task_struct *task); 778 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 779 struct task_struct *self, 780 struct task_struct *task); 781 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 782 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 783 int trace_pid_show(struct seq_file *m, void *v); 784 void trace_free_pid_list(struct trace_pid_list *pid_list); 785 int trace_pid_write(struct trace_pid_list *filtered_pids, 786 struct trace_pid_list **new_pid_list, 787 const char __user *ubuf, size_t cnt); 788 789 #ifdef CONFIG_TRACER_MAX_TRACE 790 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 791 void *cond_data); 792 void update_max_tr_single(struct trace_array *tr, 793 struct task_struct *tsk, int cpu); 794 #endif /* CONFIG_TRACER_MAX_TRACE */ 795 796 #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ 797 defined(CONFIG_FSNOTIFY) 798 799 void latency_fsnotify(struct trace_array *tr); 800 801 #else 802 803 static void latency_fsnotify(struct trace_array *tr) { } 804 805 #endif 806 807 #ifdef CONFIG_STACKTRACE 808 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 809 int pc); 810 #else 811 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 812 int skip, int pc) 813 { 814 } 815 #endif /* CONFIG_STACKTRACE */ 816 817 extern u64 ftrace_now(int cpu); 818 819 extern void trace_find_cmdline(int pid, char comm[]); 820 extern int trace_find_tgid(int pid); 821 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 822 823 #ifdef CONFIG_DYNAMIC_FTRACE 824 extern unsigned long ftrace_update_tot_cnt; 825 extern unsigned long ftrace_number_of_pages; 826 extern unsigned long ftrace_number_of_groups; 827 void ftrace_init_trace_array(struct trace_array *tr); 828 #else 829 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 830 #endif 831 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 832 extern int DYN_FTRACE_TEST_NAME(void); 833 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 834 extern int DYN_FTRACE_TEST_NAME2(void); 835 836 extern bool ring_buffer_expanded; 837 extern bool tracing_selftest_disabled; 838 839 #ifdef CONFIG_FTRACE_STARTUP_TEST 840 extern int trace_selftest_startup_function(struct tracer *trace, 841 struct trace_array *tr); 842 extern int trace_selftest_startup_function_graph(struct tracer *trace, 843 struct trace_array *tr); 844 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 845 struct trace_array *tr); 846 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 847 struct trace_array *tr); 848 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 849 struct trace_array *tr); 850 extern int trace_selftest_startup_wakeup(struct tracer *trace, 851 struct trace_array *tr); 852 extern int trace_selftest_startup_nop(struct tracer *trace, 853 struct trace_array *tr); 854 extern int trace_selftest_startup_branch(struct tracer *trace, 855 struct trace_array *tr); 856 /* 857 * Tracer data references selftest functions that only occur 858 * on boot up. These can be __init functions. Thus, when selftests 859 * are enabled, then the tracers need to reference __init functions. 860 */ 861 #define __tracer_data __refdata 862 #else 863 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 864 #define __tracer_data __read_mostly 865 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 866 867 extern void *head_page(struct trace_array_cpu *data); 868 extern unsigned long long ns2usecs(u64 nsec); 869 extern int 870 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 871 extern int 872 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 873 extern int 874 trace_array_vprintk(struct trace_array *tr, 875 unsigned long ip, const char *fmt, va_list args); 876 int trace_array_printk(struct trace_array *tr, 877 unsigned long ip, const char *fmt, ...); 878 int trace_array_printk_buf(struct ring_buffer *buffer, 879 unsigned long ip, const char *fmt, ...); 880 void trace_printk_seq(struct trace_seq *s); 881 enum print_line_t print_trace_line(struct trace_iterator *iter); 882 883 extern char trace_find_mark(unsigned long long duration); 884 885 struct ftrace_hash; 886 887 struct ftrace_mod_load { 888 struct list_head list; 889 char *func; 890 char *module; 891 int enable; 892 }; 893 894 enum { 895 FTRACE_HASH_FL_MOD = (1 << 0), 896 }; 897 898 struct ftrace_hash { 899 unsigned long size_bits; 900 struct hlist_head *buckets; 901 unsigned long count; 902 unsigned long flags; 903 struct rcu_head rcu; 904 }; 905 906 struct ftrace_func_entry * 907 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 908 909 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 910 { 911 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 912 } 913 914 /* Standard output formatting function used for function return traces */ 915 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 916 917 /* Flag options */ 918 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 919 #define TRACE_GRAPH_PRINT_CPU 0x2 920 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 921 #define TRACE_GRAPH_PRINT_PROC 0x8 922 #define TRACE_GRAPH_PRINT_DURATION 0x10 923 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 924 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 925 #define TRACE_GRAPH_PRINT_IRQS 0x80 926 #define TRACE_GRAPH_PRINT_TAIL 0x100 927 #define TRACE_GRAPH_SLEEP_TIME 0x200 928 #define TRACE_GRAPH_GRAPH_TIME 0x400 929 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 930 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 931 932 extern void ftrace_graph_sleep_time_control(bool enable); 933 934 #ifdef CONFIG_FUNCTION_PROFILER 935 extern void ftrace_graph_graph_time_control(bool enable); 936 #else 937 static inline void ftrace_graph_graph_time_control(bool enable) { } 938 #endif 939 940 extern enum print_line_t 941 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 942 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 943 extern void 944 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 945 extern void graph_trace_open(struct trace_iterator *iter); 946 extern void graph_trace_close(struct trace_iterator *iter); 947 extern int __trace_graph_entry(struct trace_array *tr, 948 struct ftrace_graph_ent *trace, 949 unsigned long flags, int pc); 950 extern void __trace_graph_return(struct trace_array *tr, 951 struct ftrace_graph_ret *trace, 952 unsigned long flags, int pc); 953 954 #ifdef CONFIG_DYNAMIC_FTRACE 955 extern struct ftrace_hash *ftrace_graph_hash; 956 extern struct ftrace_hash *ftrace_graph_notrace_hash; 957 958 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 959 { 960 unsigned long addr = trace->func; 961 int ret = 0; 962 963 preempt_disable_notrace(); 964 965 if (ftrace_hash_empty(ftrace_graph_hash)) { 966 ret = 1; 967 goto out; 968 } 969 970 if (ftrace_lookup_ip(ftrace_graph_hash, addr)) { 971 972 /* 973 * This needs to be cleared on the return functions 974 * when the depth is zero. 975 */ 976 trace_recursion_set(TRACE_GRAPH_BIT); 977 trace_recursion_set_depth(trace->depth); 978 979 /* 980 * If no irqs are to be traced, but a set_graph_function 981 * is set, and called by an interrupt handler, we still 982 * want to trace it. 983 */ 984 if (in_irq()) 985 trace_recursion_set(TRACE_IRQ_BIT); 986 else 987 trace_recursion_clear(TRACE_IRQ_BIT); 988 ret = 1; 989 } 990 991 out: 992 preempt_enable_notrace(); 993 return ret; 994 } 995 996 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 997 { 998 if (trace_recursion_test(TRACE_GRAPH_BIT) && 999 trace->depth == trace_recursion_depth()) 1000 trace_recursion_clear(TRACE_GRAPH_BIT); 1001 } 1002 1003 static inline int ftrace_graph_notrace_addr(unsigned long addr) 1004 { 1005 int ret = 0; 1006 1007 preempt_disable_notrace(); 1008 1009 if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr)) 1010 ret = 1; 1011 1012 preempt_enable_notrace(); 1013 return ret; 1014 } 1015 #else 1016 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 1017 { 1018 return 1; 1019 } 1020 1021 static inline int ftrace_graph_notrace_addr(unsigned long addr) 1022 { 1023 return 0; 1024 } 1025 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 1026 { } 1027 #endif /* CONFIG_DYNAMIC_FTRACE */ 1028 1029 extern unsigned int fgraph_max_depth; 1030 1031 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 1032 { 1033 /* trace it when it is-nested-in or is a function enabled. */ 1034 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 1035 ftrace_graph_addr(trace)) || 1036 (trace->depth < 0) || 1037 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 1038 } 1039 1040 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 1041 static inline enum print_line_t 1042 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 1043 { 1044 return TRACE_TYPE_UNHANDLED; 1045 } 1046 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 1047 1048 extern struct list_head ftrace_pids; 1049 1050 #ifdef CONFIG_FUNCTION_TRACER 1051 struct ftrace_func_command { 1052 struct list_head list; 1053 char *name; 1054 int (*func)(struct trace_array *tr, 1055 struct ftrace_hash *hash, 1056 char *func, char *cmd, 1057 char *params, int enable); 1058 }; 1059 extern bool ftrace_filter_param __initdata; 1060 static inline int ftrace_trace_task(struct trace_array *tr) 1061 { 1062 return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid); 1063 } 1064 extern int ftrace_is_dead(void); 1065 int ftrace_create_function_files(struct trace_array *tr, 1066 struct dentry *parent); 1067 void ftrace_destroy_function_files(struct trace_array *tr); 1068 void ftrace_init_global_array_ops(struct trace_array *tr); 1069 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 1070 void ftrace_reset_array_ops(struct trace_array *tr); 1071 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 1072 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1073 struct dentry *d_tracer); 1074 void ftrace_clear_pids(struct trace_array *tr); 1075 int init_function_trace(void); 1076 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1077 #else 1078 static inline int ftrace_trace_task(struct trace_array *tr) 1079 { 1080 return 1; 1081 } 1082 static inline int ftrace_is_dead(void) { return 0; } 1083 static inline int 1084 ftrace_create_function_files(struct trace_array *tr, 1085 struct dentry *parent) 1086 { 1087 return 0; 1088 } 1089 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1090 static inline __init void 1091 ftrace_init_global_array_ops(struct trace_array *tr) { } 1092 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1093 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1094 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1095 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1096 static inline int init_function_trace(void) { return 0; } 1097 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1098 /* ftace_func_t type is not defined, use macro instead of static inline */ 1099 #define ftrace_init_array_ops(tr, func) do { } while (0) 1100 #endif /* CONFIG_FUNCTION_TRACER */ 1101 1102 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1103 1104 struct ftrace_probe_ops { 1105 void (*func)(unsigned long ip, 1106 unsigned long parent_ip, 1107 struct trace_array *tr, 1108 struct ftrace_probe_ops *ops, 1109 void *data); 1110 int (*init)(struct ftrace_probe_ops *ops, 1111 struct trace_array *tr, 1112 unsigned long ip, void *init_data, 1113 void **data); 1114 void (*free)(struct ftrace_probe_ops *ops, 1115 struct trace_array *tr, 1116 unsigned long ip, void *data); 1117 int (*print)(struct seq_file *m, 1118 unsigned long ip, 1119 struct ftrace_probe_ops *ops, 1120 void *data); 1121 }; 1122 1123 struct ftrace_func_mapper; 1124 typedef int (*ftrace_mapper_func)(void *data); 1125 1126 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1127 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1128 unsigned long ip); 1129 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1130 unsigned long ip, void *data); 1131 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1132 unsigned long ip); 1133 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1134 ftrace_mapper_func free_func); 1135 1136 extern int 1137 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1138 struct ftrace_probe_ops *ops, void *data); 1139 extern int 1140 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1141 struct ftrace_probe_ops *ops); 1142 extern void clear_ftrace_function_probes(struct trace_array *tr); 1143 1144 int register_ftrace_command(struct ftrace_func_command *cmd); 1145 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1146 1147 void ftrace_create_filter_files(struct ftrace_ops *ops, 1148 struct dentry *parent); 1149 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1150 #else 1151 struct ftrace_func_command; 1152 1153 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1154 { 1155 return -EINVAL; 1156 } 1157 static inline __init int unregister_ftrace_command(char *cmd_name) 1158 { 1159 return -EINVAL; 1160 } 1161 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1162 { 1163 } 1164 1165 /* 1166 * The ops parameter passed in is usually undefined. 1167 * This must be a macro. 1168 */ 1169 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1170 #define ftrace_destroy_filter_files(ops) do { } while (0) 1171 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1172 1173 bool ftrace_event_is_function(struct trace_event_call *call); 1174 1175 /* 1176 * struct trace_parser - servers for reading the user input separated by spaces 1177 * @cont: set if the input is not complete - no final space char was found 1178 * @buffer: holds the parsed user input 1179 * @idx: user input length 1180 * @size: buffer size 1181 */ 1182 struct trace_parser { 1183 bool cont; 1184 char *buffer; 1185 unsigned idx; 1186 unsigned size; 1187 }; 1188 1189 static inline bool trace_parser_loaded(struct trace_parser *parser) 1190 { 1191 return (parser->idx != 0); 1192 } 1193 1194 static inline bool trace_parser_cont(struct trace_parser *parser) 1195 { 1196 return parser->cont; 1197 } 1198 1199 static inline void trace_parser_clear(struct trace_parser *parser) 1200 { 1201 parser->cont = false; 1202 parser->idx = 0; 1203 } 1204 1205 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1206 extern void trace_parser_put(struct trace_parser *parser); 1207 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1208 size_t cnt, loff_t *ppos); 1209 1210 /* 1211 * Only create function graph options if function graph is configured. 1212 */ 1213 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1214 # define FGRAPH_FLAGS \ 1215 C(DISPLAY_GRAPH, "display-graph"), 1216 #else 1217 # define FGRAPH_FLAGS 1218 #endif 1219 1220 #ifdef CONFIG_BRANCH_TRACER 1221 # define BRANCH_FLAGS \ 1222 C(BRANCH, "branch"), 1223 #else 1224 # define BRANCH_FLAGS 1225 #endif 1226 1227 #ifdef CONFIG_FUNCTION_TRACER 1228 # define FUNCTION_FLAGS \ 1229 C(FUNCTION, "function-trace"), \ 1230 C(FUNC_FORK, "function-fork"), 1231 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1232 #else 1233 # define FUNCTION_FLAGS 1234 # define FUNCTION_DEFAULT_FLAGS 0UL 1235 # define TRACE_ITER_FUNC_FORK 0UL 1236 #endif 1237 1238 #ifdef CONFIG_STACKTRACE 1239 # define STACK_FLAGS \ 1240 C(STACKTRACE, "stacktrace"), 1241 #else 1242 # define STACK_FLAGS 1243 #endif 1244 1245 /* 1246 * trace_iterator_flags is an enumeration that defines bit 1247 * positions into trace_flags that controls the output. 1248 * 1249 * NOTE: These bits must match the trace_options array in 1250 * trace.c (this macro guarantees it). 1251 */ 1252 #define TRACE_FLAGS \ 1253 C(PRINT_PARENT, "print-parent"), \ 1254 C(SYM_OFFSET, "sym-offset"), \ 1255 C(SYM_ADDR, "sym-addr"), \ 1256 C(VERBOSE, "verbose"), \ 1257 C(RAW, "raw"), \ 1258 C(HEX, "hex"), \ 1259 C(BIN, "bin"), \ 1260 C(BLOCK, "block"), \ 1261 C(PRINTK, "trace_printk"), \ 1262 C(ANNOTATE, "annotate"), \ 1263 C(USERSTACKTRACE, "userstacktrace"), \ 1264 C(SYM_USEROBJ, "sym-userobj"), \ 1265 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1266 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1267 C(LATENCY_FMT, "latency-format"), \ 1268 C(RECORD_CMD, "record-cmd"), \ 1269 C(RECORD_TGID, "record-tgid"), \ 1270 C(OVERWRITE, "overwrite"), \ 1271 C(STOP_ON_FREE, "disable_on_free"), \ 1272 C(IRQ_INFO, "irq-info"), \ 1273 C(MARKERS, "markers"), \ 1274 C(EVENT_FORK, "event-fork"), \ 1275 FUNCTION_FLAGS \ 1276 FGRAPH_FLAGS \ 1277 STACK_FLAGS \ 1278 BRANCH_FLAGS 1279 1280 /* 1281 * By defining C, we can make TRACE_FLAGS a list of bit names 1282 * that will define the bits for the flag masks. 1283 */ 1284 #undef C 1285 #define C(a, b) TRACE_ITER_##a##_BIT 1286 1287 enum trace_iterator_bits { 1288 TRACE_FLAGS 1289 /* Make sure we don't go more than we have bits for */ 1290 TRACE_ITER_LAST_BIT 1291 }; 1292 1293 /* 1294 * By redefining C, we can make TRACE_FLAGS a list of masks that 1295 * use the bits as defined above. 1296 */ 1297 #undef C 1298 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1299 1300 enum trace_iterator_flags { TRACE_FLAGS }; 1301 1302 /* 1303 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1304 * control the output of kernel symbols. 1305 */ 1306 #define TRACE_ITER_SYM_MASK \ 1307 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1308 1309 extern struct tracer nop_trace; 1310 1311 #ifdef CONFIG_BRANCH_TRACER 1312 extern int enable_branch_tracing(struct trace_array *tr); 1313 extern void disable_branch_tracing(void); 1314 static inline int trace_branch_enable(struct trace_array *tr) 1315 { 1316 if (tr->trace_flags & TRACE_ITER_BRANCH) 1317 return enable_branch_tracing(tr); 1318 return 0; 1319 } 1320 static inline void trace_branch_disable(void) 1321 { 1322 /* due to races, always disable */ 1323 disable_branch_tracing(); 1324 } 1325 #else 1326 static inline int trace_branch_enable(struct trace_array *tr) 1327 { 1328 return 0; 1329 } 1330 static inline void trace_branch_disable(void) 1331 { 1332 } 1333 #endif /* CONFIG_BRANCH_TRACER */ 1334 1335 /* set ring buffers to default size if not already done so */ 1336 int tracing_update_buffers(void); 1337 1338 struct ftrace_event_field { 1339 struct list_head link; 1340 const char *name; 1341 const char *type; 1342 int filter_type; 1343 int offset; 1344 int size; 1345 int is_signed; 1346 }; 1347 1348 struct prog_entry; 1349 1350 struct event_filter { 1351 struct prog_entry __rcu *prog; 1352 char *filter_string; 1353 }; 1354 1355 struct event_subsystem { 1356 struct list_head list; 1357 const char *name; 1358 struct event_filter *filter; 1359 int ref_count; 1360 }; 1361 1362 struct trace_subsystem_dir { 1363 struct list_head list; 1364 struct event_subsystem *subsystem; 1365 struct trace_array *tr; 1366 struct dentry *entry; 1367 int ref_count; 1368 int nr_events; 1369 }; 1370 1371 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1372 struct ring_buffer *buffer, 1373 struct ring_buffer_event *event); 1374 1375 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1376 struct ring_buffer *buffer, 1377 struct ring_buffer_event *event, 1378 unsigned long flags, int pc, 1379 struct pt_regs *regs); 1380 1381 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1382 struct ring_buffer *buffer, 1383 struct ring_buffer_event *event, 1384 unsigned long flags, int pc) 1385 { 1386 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL); 1387 } 1388 1389 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1390 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1391 void trace_buffered_event_disable(void); 1392 void trace_buffered_event_enable(void); 1393 1394 static inline void 1395 __trace_event_discard_commit(struct ring_buffer *buffer, 1396 struct ring_buffer_event *event) 1397 { 1398 if (this_cpu_read(trace_buffered_event) == event) { 1399 /* Simply release the temp buffer */ 1400 this_cpu_dec(trace_buffered_event_cnt); 1401 return; 1402 } 1403 ring_buffer_discard_commit(buffer, event); 1404 } 1405 1406 /* 1407 * Helper function for event_trigger_unlock_commit{_regs}(). 1408 * If there are event triggers attached to this event that requires 1409 * filtering against its fields, then they wil be called as the 1410 * entry already holds the field information of the current event. 1411 * 1412 * It also checks if the event should be discarded or not. 1413 * It is to be discarded if the event is soft disabled and the 1414 * event was only recorded to process triggers, or if the event 1415 * filter is active and this event did not match the filters. 1416 * 1417 * Returns true if the event is discarded, false otherwise. 1418 */ 1419 static inline bool 1420 __event_trigger_test_discard(struct trace_event_file *file, 1421 struct ring_buffer *buffer, 1422 struct ring_buffer_event *event, 1423 void *entry, 1424 enum event_trigger_type *tt) 1425 { 1426 unsigned long eflags = file->flags; 1427 1428 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1429 *tt = event_triggers_call(file, entry, event); 1430 1431 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || 1432 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && 1433 !filter_match_preds(file->filter, entry))) { 1434 __trace_event_discard_commit(buffer, event); 1435 return true; 1436 } 1437 1438 return false; 1439 } 1440 1441 /** 1442 * event_trigger_unlock_commit - handle triggers and finish event commit 1443 * @file: The file pointer assoctiated to the event 1444 * @buffer: The ring buffer that the event is being written to 1445 * @event: The event meta data in the ring buffer 1446 * @entry: The event itself 1447 * @irq_flags: The state of the interrupts at the start of the event 1448 * @pc: The state of the preempt count at the start of the event. 1449 * 1450 * This is a helper function to handle triggers that require data 1451 * from the event itself. It also tests the event against filters and 1452 * if the event is soft disabled and should be discarded. 1453 */ 1454 static inline void 1455 event_trigger_unlock_commit(struct trace_event_file *file, 1456 struct ring_buffer *buffer, 1457 struct ring_buffer_event *event, 1458 void *entry, unsigned long irq_flags, int pc) 1459 { 1460 enum event_trigger_type tt = ETT_NONE; 1461 1462 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1463 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc); 1464 1465 if (tt) 1466 event_triggers_post_call(file, tt); 1467 } 1468 1469 /** 1470 * event_trigger_unlock_commit_regs - handle triggers and finish event commit 1471 * @file: The file pointer assoctiated to the event 1472 * @buffer: The ring buffer that the event is being written to 1473 * @event: The event meta data in the ring buffer 1474 * @entry: The event itself 1475 * @irq_flags: The state of the interrupts at the start of the event 1476 * @pc: The state of the preempt count at the start of the event. 1477 * 1478 * This is a helper function to handle triggers that require data 1479 * from the event itself. It also tests the event against filters and 1480 * if the event is soft disabled and should be discarded. 1481 * 1482 * Same as event_trigger_unlock_commit() but calls 1483 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). 1484 */ 1485 static inline void 1486 event_trigger_unlock_commit_regs(struct trace_event_file *file, 1487 struct ring_buffer *buffer, 1488 struct ring_buffer_event *event, 1489 void *entry, unsigned long irq_flags, int pc, 1490 struct pt_regs *regs) 1491 { 1492 enum event_trigger_type tt = ETT_NONE; 1493 1494 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1495 trace_buffer_unlock_commit_regs(file->tr, buffer, event, 1496 irq_flags, pc, regs); 1497 1498 if (tt) 1499 event_triggers_post_call(file, tt); 1500 } 1501 1502 #define FILTER_PRED_INVALID ((unsigned short)-1) 1503 #define FILTER_PRED_IS_RIGHT (1 << 15) 1504 #define FILTER_PRED_FOLD (1 << 15) 1505 1506 /* 1507 * The max preds is the size of unsigned short with 1508 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1509 * and FOLD flags. The other is reserved. 1510 * 1511 * 2^14 preds is way more than enough. 1512 */ 1513 #define MAX_FILTER_PRED 16384 1514 1515 struct filter_pred; 1516 struct regex; 1517 1518 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1519 1520 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1521 1522 enum regex_type { 1523 MATCH_FULL = 0, 1524 MATCH_FRONT_ONLY, 1525 MATCH_MIDDLE_ONLY, 1526 MATCH_END_ONLY, 1527 MATCH_GLOB, 1528 MATCH_INDEX, 1529 }; 1530 1531 struct regex { 1532 char pattern[MAX_FILTER_STR_VAL]; 1533 int len; 1534 int field_len; 1535 regex_match_func match; 1536 }; 1537 1538 struct filter_pred { 1539 filter_pred_fn_t fn; 1540 u64 val; 1541 struct regex regex; 1542 unsigned short *ops; 1543 struct ftrace_event_field *field; 1544 int offset; 1545 int not; 1546 int op; 1547 }; 1548 1549 static inline bool is_string_field(struct ftrace_event_field *field) 1550 { 1551 return field->filter_type == FILTER_DYN_STRING || 1552 field->filter_type == FILTER_STATIC_STRING || 1553 field->filter_type == FILTER_PTR_STRING || 1554 field->filter_type == FILTER_COMM; 1555 } 1556 1557 static inline bool is_function_field(struct ftrace_event_field *field) 1558 { 1559 return field->filter_type == FILTER_TRACE_FN; 1560 } 1561 1562 extern enum regex_type 1563 filter_parse_regex(char *buff, int len, char **search, int *not); 1564 extern void print_event_filter(struct trace_event_file *file, 1565 struct trace_seq *s); 1566 extern int apply_event_filter(struct trace_event_file *file, 1567 char *filter_string); 1568 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1569 char *filter_string); 1570 extern void print_subsystem_event_filter(struct event_subsystem *system, 1571 struct trace_seq *s); 1572 extern int filter_assign_type(const char *type); 1573 extern int create_event_filter(struct trace_array *tr, 1574 struct trace_event_call *call, 1575 char *filter_str, bool set_str, 1576 struct event_filter **filterp); 1577 extern void free_event_filter(struct event_filter *filter); 1578 1579 struct ftrace_event_field * 1580 trace_find_event_field(struct trace_event_call *call, char *name); 1581 1582 extern void trace_event_enable_cmd_record(bool enable); 1583 extern void trace_event_enable_tgid_record(bool enable); 1584 1585 extern int event_trace_init(void); 1586 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1587 extern int event_trace_del_tracer(struct trace_array *tr); 1588 1589 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1590 const char *system, 1591 const char *event); 1592 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1593 const char *system, 1594 const char *event); 1595 1596 static inline void *event_file_data(struct file *filp) 1597 { 1598 return READ_ONCE(file_inode(filp)->i_private); 1599 } 1600 1601 extern struct mutex event_mutex; 1602 extern struct list_head ftrace_events; 1603 1604 extern const struct file_operations event_trigger_fops; 1605 extern const struct file_operations event_hist_fops; 1606 1607 #ifdef CONFIG_HIST_TRIGGERS 1608 extern int register_trigger_hist_cmd(void); 1609 extern int register_trigger_hist_enable_disable_cmds(void); 1610 #else 1611 static inline int register_trigger_hist_cmd(void) { return 0; } 1612 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1613 #endif 1614 1615 extern int register_trigger_cmds(void); 1616 extern void clear_event_triggers(struct trace_array *tr); 1617 1618 struct event_trigger_data { 1619 unsigned long count; 1620 int ref; 1621 struct event_trigger_ops *ops; 1622 struct event_command *cmd_ops; 1623 struct event_filter __rcu *filter; 1624 char *filter_str; 1625 void *private_data; 1626 bool paused; 1627 bool paused_tmp; 1628 struct list_head list; 1629 char *name; 1630 struct list_head named_list; 1631 struct event_trigger_data *named_data; 1632 }; 1633 1634 /* Avoid typos */ 1635 #define ENABLE_EVENT_STR "enable_event" 1636 #define DISABLE_EVENT_STR "disable_event" 1637 #define ENABLE_HIST_STR "enable_hist" 1638 #define DISABLE_HIST_STR "disable_hist" 1639 1640 struct enable_trigger_data { 1641 struct trace_event_file *file; 1642 bool enable; 1643 bool hist; 1644 }; 1645 1646 extern int event_enable_trigger_print(struct seq_file *m, 1647 struct event_trigger_ops *ops, 1648 struct event_trigger_data *data); 1649 extern void event_enable_trigger_free(struct event_trigger_ops *ops, 1650 struct event_trigger_data *data); 1651 extern int event_enable_trigger_func(struct event_command *cmd_ops, 1652 struct trace_event_file *file, 1653 char *glob, char *cmd, char *param); 1654 extern int event_enable_register_trigger(char *glob, 1655 struct event_trigger_ops *ops, 1656 struct event_trigger_data *data, 1657 struct trace_event_file *file); 1658 extern void event_enable_unregister_trigger(char *glob, 1659 struct event_trigger_ops *ops, 1660 struct event_trigger_data *test, 1661 struct trace_event_file *file); 1662 extern void trigger_data_free(struct event_trigger_data *data); 1663 extern int event_trigger_init(struct event_trigger_ops *ops, 1664 struct event_trigger_data *data); 1665 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1666 int trigger_enable); 1667 extern void update_cond_flag(struct trace_event_file *file); 1668 extern int set_trigger_filter(char *filter_str, 1669 struct event_trigger_data *trigger_data, 1670 struct trace_event_file *file); 1671 extern struct event_trigger_data *find_named_trigger(const char *name); 1672 extern bool is_named_trigger(struct event_trigger_data *test); 1673 extern int save_named_trigger(const char *name, 1674 struct event_trigger_data *data); 1675 extern void del_named_trigger(struct event_trigger_data *data); 1676 extern void pause_named_trigger(struct event_trigger_data *data); 1677 extern void unpause_named_trigger(struct event_trigger_data *data); 1678 extern void set_named_trigger_data(struct event_trigger_data *data, 1679 struct event_trigger_data *named_data); 1680 extern struct event_trigger_data * 1681 get_named_trigger_data(struct event_trigger_data *data); 1682 extern int register_event_command(struct event_command *cmd); 1683 extern int unregister_event_command(struct event_command *cmd); 1684 extern int register_trigger_hist_enable_disable_cmds(void); 1685 1686 /** 1687 * struct event_trigger_ops - callbacks for trace event triggers 1688 * 1689 * The methods in this structure provide per-event trigger hooks for 1690 * various trigger operations. 1691 * 1692 * All the methods below, except for @init() and @free(), must be 1693 * implemented. 1694 * 1695 * @func: The trigger 'probe' function called when the triggering 1696 * event occurs. The data passed into this callback is the data 1697 * that was supplied to the event_command @reg() function that 1698 * registered the trigger (see struct event_command) along with 1699 * the trace record, rec. 1700 * 1701 * @init: An optional initialization function called for the trigger 1702 * when the trigger is registered (via the event_command reg() 1703 * function). This can be used to perform per-trigger 1704 * initialization such as incrementing a per-trigger reference 1705 * count, for instance. This is usually implemented by the 1706 * generic utility function @event_trigger_init() (see 1707 * trace_event_triggers.c). 1708 * 1709 * @free: An optional de-initialization function called for the 1710 * trigger when the trigger is unregistered (via the 1711 * event_command @reg() function). This can be used to perform 1712 * per-trigger de-initialization such as decrementing a 1713 * per-trigger reference count and freeing corresponding trigger 1714 * data, for instance. This is usually implemented by the 1715 * generic utility function @event_trigger_free() (see 1716 * trace_event_triggers.c). 1717 * 1718 * @print: The callback function invoked to have the trigger print 1719 * itself. This is usually implemented by a wrapper function 1720 * that calls the generic utility function @event_trigger_print() 1721 * (see trace_event_triggers.c). 1722 */ 1723 struct event_trigger_ops { 1724 void (*func)(struct event_trigger_data *data, 1725 void *rec, 1726 struct ring_buffer_event *rbe); 1727 int (*init)(struct event_trigger_ops *ops, 1728 struct event_trigger_data *data); 1729 void (*free)(struct event_trigger_ops *ops, 1730 struct event_trigger_data *data); 1731 int (*print)(struct seq_file *m, 1732 struct event_trigger_ops *ops, 1733 struct event_trigger_data *data); 1734 }; 1735 1736 /** 1737 * struct event_command - callbacks and data members for event commands 1738 * 1739 * Event commands are invoked by users by writing the command name 1740 * into the 'trigger' file associated with a trace event. The 1741 * parameters associated with a specific invocation of an event 1742 * command are used to create an event trigger instance, which is 1743 * added to the list of trigger instances associated with that trace 1744 * event. When the event is hit, the set of triggers associated with 1745 * that event is invoked. 1746 * 1747 * The data members in this structure provide per-event command data 1748 * for various event commands. 1749 * 1750 * All the data members below, except for @post_trigger, must be set 1751 * for each event command. 1752 * 1753 * @name: The unique name that identifies the event command. This is 1754 * the name used when setting triggers via trigger files. 1755 * 1756 * @trigger_type: A unique id that identifies the event command 1757 * 'type'. This value has two purposes, the first to ensure that 1758 * only one trigger of the same type can be set at a given time 1759 * for a particular event e.g. it doesn't make sense to have both 1760 * a traceon and traceoff trigger attached to a single event at 1761 * the same time, so traceon and traceoff have the same type 1762 * though they have different names. The @trigger_type value is 1763 * also used as a bit value for deferring the actual trigger 1764 * action until after the current event is finished. Some 1765 * commands need to do this if they themselves log to the trace 1766 * buffer (see the @post_trigger() member below). @trigger_type 1767 * values are defined by adding new values to the trigger_type 1768 * enum in include/linux/trace_events.h. 1769 * 1770 * @flags: See the enum event_command_flags below. 1771 * 1772 * All the methods below, except for @set_filter() and @unreg_all(), 1773 * must be implemented. 1774 * 1775 * @func: The callback function responsible for parsing and 1776 * registering the trigger written to the 'trigger' file by the 1777 * user. It allocates the trigger instance and registers it with 1778 * the appropriate trace event. It makes use of the other 1779 * event_command callback functions to orchestrate this, and is 1780 * usually implemented by the generic utility function 1781 * @event_trigger_callback() (see trace_event_triggers.c). 1782 * 1783 * @reg: Adds the trigger to the list of triggers associated with the 1784 * event, and enables the event trigger itself, after 1785 * initializing it (via the event_trigger_ops @init() function). 1786 * This is also where commands can use the @trigger_type value to 1787 * make the decision as to whether or not multiple instances of 1788 * the trigger should be allowed. This is usually implemented by 1789 * the generic utility function @register_trigger() (see 1790 * trace_event_triggers.c). 1791 * 1792 * @unreg: Removes the trigger from the list of triggers associated 1793 * with the event, and disables the event trigger itself, after 1794 * initializing it (via the event_trigger_ops @free() function). 1795 * This is usually implemented by the generic utility function 1796 * @unregister_trigger() (see trace_event_triggers.c). 1797 * 1798 * @unreg_all: An optional function called to remove all the triggers 1799 * from the list of triggers associated with the event. Called 1800 * when a trigger file is opened in truncate mode. 1801 * 1802 * @set_filter: An optional function called to parse and set a filter 1803 * for the trigger. If no @set_filter() method is set for the 1804 * event command, filters set by the user for the command will be 1805 * ignored. This is usually implemented by the generic utility 1806 * function @set_trigger_filter() (see trace_event_triggers.c). 1807 * 1808 * @get_trigger_ops: The callback function invoked to retrieve the 1809 * event_trigger_ops implementation associated with the command. 1810 */ 1811 struct event_command { 1812 struct list_head list; 1813 char *name; 1814 enum event_trigger_type trigger_type; 1815 int flags; 1816 int (*func)(struct event_command *cmd_ops, 1817 struct trace_event_file *file, 1818 char *glob, char *cmd, char *params); 1819 int (*reg)(char *glob, 1820 struct event_trigger_ops *ops, 1821 struct event_trigger_data *data, 1822 struct trace_event_file *file); 1823 void (*unreg)(char *glob, 1824 struct event_trigger_ops *ops, 1825 struct event_trigger_data *data, 1826 struct trace_event_file *file); 1827 void (*unreg_all)(struct trace_event_file *file); 1828 int (*set_filter)(char *filter_str, 1829 struct event_trigger_data *data, 1830 struct trace_event_file *file); 1831 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1832 }; 1833 1834 /** 1835 * enum event_command_flags - flags for struct event_command 1836 * 1837 * @POST_TRIGGER: A flag that says whether or not this command needs 1838 * to have its action delayed until after the current event has 1839 * been closed. Some triggers need to avoid being invoked while 1840 * an event is currently in the process of being logged, since 1841 * the trigger may itself log data into the trace buffer. Thus 1842 * we make sure the current event is committed before invoking 1843 * those triggers. To do that, the trigger invocation is split 1844 * in two - the first part checks the filter using the current 1845 * trace record; if a command has the @post_trigger flag set, it 1846 * sets a bit for itself in the return value, otherwise it 1847 * directly invokes the trigger. Once all commands have been 1848 * either invoked or set their return flag, the current record is 1849 * either committed or discarded. At that point, if any commands 1850 * have deferred their triggers, those commands are finally 1851 * invoked following the close of the current event. In other 1852 * words, if the event_trigger_ops @func() probe implementation 1853 * itself logs to the trace buffer, this flag should be set, 1854 * otherwise it can be left unspecified. 1855 * 1856 * @NEEDS_REC: A flag that says whether or not this command needs 1857 * access to the trace record in order to perform its function, 1858 * regardless of whether or not it has a filter associated with 1859 * it (filters make a trigger require access to the trace record 1860 * but are not always present). 1861 */ 1862 enum event_command_flags { 1863 EVENT_CMD_FL_POST_TRIGGER = 1, 1864 EVENT_CMD_FL_NEEDS_REC = 2, 1865 }; 1866 1867 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1868 { 1869 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1870 } 1871 1872 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1873 { 1874 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1875 } 1876 1877 extern int trace_event_enable_disable(struct trace_event_file *file, 1878 int enable, int soft_disable); 1879 extern int tracing_alloc_snapshot(void); 1880 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1881 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1882 1883 extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1884 extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1885 1886 extern const char *__start___trace_bprintk_fmt[]; 1887 extern const char *__stop___trace_bprintk_fmt[]; 1888 1889 extern const char *__start___tracepoint_str[]; 1890 extern const char *__stop___tracepoint_str[]; 1891 1892 void trace_printk_control(bool enabled); 1893 void trace_printk_init_buffers(void); 1894 void trace_printk_start_comm(void); 1895 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1896 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1897 1898 #define MAX_EVENT_NAME_LEN 64 1899 1900 extern int trace_run_command(const char *buf, int (*createfn)(int, char**)); 1901 extern ssize_t trace_parse_run_command(struct file *file, 1902 const char __user *buffer, size_t count, loff_t *ppos, 1903 int (*createfn)(int, char**)); 1904 1905 extern unsigned int err_pos(char *cmd, const char *str); 1906 extern void tracing_log_err(struct trace_array *tr, 1907 const char *loc, const char *cmd, 1908 const char **errs, u8 type, u8 pos); 1909 1910 /* 1911 * Normal trace_printk() and friends allocates special buffers 1912 * to do the manipulation, as well as saves the print formats 1913 * into sections to display. But the trace infrastructure wants 1914 * to use these without the added overhead at the price of being 1915 * a bit slower (used mainly for warnings, where we don't care 1916 * about performance). The internal_trace_puts() is for such 1917 * a purpose. 1918 */ 1919 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1920 1921 #undef FTRACE_ENTRY 1922 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1923 extern struct trace_event_call \ 1924 __aligned(4) event_##call; 1925 #undef FTRACE_ENTRY_DUP 1926 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1927 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1928 filter) 1929 #undef FTRACE_ENTRY_PACKED 1930 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \ 1931 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1932 filter) 1933 1934 #include "trace_entries.h" 1935 1936 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1937 int perf_ftrace_event_register(struct trace_event_call *call, 1938 enum trace_reg type, void *data); 1939 #else 1940 #define perf_ftrace_event_register NULL 1941 #endif 1942 1943 #ifdef CONFIG_FTRACE_SYSCALLS 1944 void init_ftrace_syscalls(void); 1945 const char *get_syscall_name(int syscall); 1946 #else 1947 static inline void init_ftrace_syscalls(void) { } 1948 static inline const char *get_syscall_name(int syscall) 1949 { 1950 return NULL; 1951 } 1952 #endif 1953 1954 #ifdef CONFIG_EVENT_TRACING 1955 void trace_event_init(void); 1956 void trace_event_eval_update(struct trace_eval_map **map, int len); 1957 #else 1958 static inline void __init trace_event_init(void) { } 1959 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1960 #endif 1961 1962 #ifdef CONFIG_TRACER_SNAPSHOT 1963 void tracing_snapshot_instance(struct trace_array *tr); 1964 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1965 #else 1966 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1967 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1968 { 1969 return 0; 1970 } 1971 #endif 1972 1973 #ifdef CONFIG_PREEMPT_TRACER 1974 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1975 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1976 #else 1977 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1978 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1979 #endif 1980 #ifdef CONFIG_IRQSOFF_TRACER 1981 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1982 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1983 #else 1984 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1985 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1986 #endif 1987 1988 extern struct trace_iterator *tracepoint_print_iter; 1989 1990 /* 1991 * Reset the state of the trace_iterator so that it can read consumed data. 1992 * Normally, the trace_iterator is used for reading the data when it is not 1993 * consumed, and must retain state. 1994 */ 1995 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 1996 { 1997 const size_t offset = offsetof(struct trace_iterator, seq); 1998 1999 /* 2000 * Keep gcc from complaining about overwriting more than just one 2001 * member in the structure. 2002 */ 2003 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset); 2004 2005 iter->pos = -1; 2006 } 2007 2008 #endif /* _LINUX_KERNEL_TRACE_H */ 2009