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/trace.h> 15 #include <linux/hw_breakpoint.h> 16 #include <linux/trace_seq.h> 17 #include <linux/trace_events.h> 18 #include <linux/compiler.h> 19 #include <linux/glob.h> 20 #include <linux/irq_work.h> 21 #include <linux/workqueue.h> 22 #include <linux/ctype.h> 23 24 #ifdef CONFIG_FTRACE_SYSCALLS 25 #include <asm/unistd.h> /* For NR_SYSCALLS */ 26 #include <asm/syscall.h> /* some archs define it here */ 27 #endif 28 29 enum trace_type { 30 __TRACE_FIRST_TYPE = 0, 31 32 TRACE_FN, 33 TRACE_CTX, 34 TRACE_WAKE, 35 TRACE_STACK, 36 TRACE_PRINT, 37 TRACE_BPRINT, 38 TRACE_MMIO_RW, 39 TRACE_MMIO_MAP, 40 TRACE_BRANCH, 41 TRACE_GRAPH_RET, 42 TRACE_GRAPH_ENT, 43 TRACE_USER_STACK, 44 TRACE_BLK, 45 TRACE_BPUTS, 46 TRACE_HWLAT, 47 TRACE_RAW_DATA, 48 49 __TRACE_LAST_TYPE, 50 }; 51 52 53 #undef __field 54 #define __field(type, item) type item; 55 56 #undef __field_fn 57 #define __field_fn(type, item) type item; 58 59 #undef __field_struct 60 #define __field_struct(type, item) __field(type, item) 61 62 #undef __field_desc 63 #define __field_desc(type, container, item) 64 65 #undef __field_packed 66 #define __field_packed(type, container, item) 67 68 #undef __array 69 #define __array(type, item, size) type item[size]; 70 71 #undef __array_desc 72 #define __array_desc(type, container, item, size) 73 74 #undef __dynamic_array 75 #define __dynamic_array(type, item) type item[]; 76 77 #undef F_STRUCT 78 #define F_STRUCT(args...) args 79 80 #undef FTRACE_ENTRY 81 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 82 struct struct_name { \ 83 struct trace_entry ent; \ 84 tstruct \ 85 } 86 87 #undef FTRACE_ENTRY_DUP 88 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 89 90 #undef FTRACE_ENTRY_REG 91 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ 92 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 93 94 #undef FTRACE_ENTRY_PACKED 95 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ 96 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed 97 98 #include "trace_entries.h" 99 100 /* Use this for memory failure errors */ 101 #define MEM_FAIL(condition, fmt, ...) ({ \ 102 static bool __section(".data.once") __warned; \ 103 int __ret_warn_once = !!(condition); \ 104 \ 105 if (unlikely(__ret_warn_once && !__warned)) { \ 106 __warned = true; \ 107 pr_err("ERROR: " fmt, ##__VA_ARGS__); \ 108 } \ 109 unlikely(__ret_warn_once); \ 110 }) 111 112 /* 113 * syscalls are special, and need special handling, this is why 114 * they are not included in trace_entries.h 115 */ 116 struct syscall_trace_enter { 117 struct trace_entry ent; 118 int nr; 119 unsigned long args[]; 120 }; 121 122 struct syscall_trace_exit { 123 struct trace_entry ent; 124 int nr; 125 long ret; 126 }; 127 128 struct kprobe_trace_entry_head { 129 struct trace_entry ent; 130 unsigned long ip; 131 }; 132 133 struct kretprobe_trace_entry_head { 134 struct trace_entry ent; 135 unsigned long func; 136 unsigned long ret_ip; 137 }; 138 139 /* 140 * trace_flag_type is an enumeration that holds different 141 * states when a trace occurs. These are: 142 * IRQS_OFF - interrupts were disabled 143 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 144 * NEED_RESCHED - reschedule is requested 145 * HARDIRQ - inside an interrupt handler 146 * SOFTIRQ - inside a softirq handler 147 */ 148 enum trace_flag_type { 149 TRACE_FLAG_IRQS_OFF = 0x01, 150 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 151 TRACE_FLAG_NEED_RESCHED = 0x04, 152 TRACE_FLAG_HARDIRQ = 0x08, 153 TRACE_FLAG_SOFTIRQ = 0x10, 154 TRACE_FLAG_PREEMPT_RESCHED = 0x20, 155 TRACE_FLAG_NMI = 0x40, 156 }; 157 158 #define TRACE_BUF_SIZE 1024 159 160 struct trace_array; 161 162 /* 163 * The CPU trace array - it consists of thousands of trace entries 164 * plus some other descriptor data: (for example which task started 165 * the trace, etc.) 166 */ 167 struct trace_array_cpu { 168 atomic_t disabled; 169 void *buffer_page; /* ring buffer spare */ 170 171 unsigned long entries; 172 unsigned long saved_latency; 173 unsigned long critical_start; 174 unsigned long critical_end; 175 unsigned long critical_sequence; 176 unsigned long nice; 177 unsigned long policy; 178 unsigned long rt_priority; 179 unsigned long skipped_entries; 180 u64 preempt_timestamp; 181 pid_t pid; 182 kuid_t uid; 183 char comm[TASK_COMM_LEN]; 184 185 #ifdef CONFIG_FUNCTION_TRACER 186 int ftrace_ignore_pid; 187 #endif 188 bool ignore_pid; 189 }; 190 191 struct tracer; 192 struct trace_option_dentry; 193 194 struct array_buffer { 195 struct trace_array *tr; 196 struct trace_buffer *buffer; 197 struct trace_array_cpu __percpu *data; 198 u64 time_start; 199 int cpu; 200 }; 201 202 #define TRACE_FLAGS_MAX_SIZE 32 203 204 struct trace_options { 205 struct tracer *tracer; 206 struct trace_option_dentry *topts; 207 }; 208 209 struct trace_pid_list { 210 int pid_max; 211 unsigned long *pids; 212 }; 213 214 enum { 215 TRACE_PIDS = BIT(0), 216 TRACE_NO_PIDS = BIT(1), 217 }; 218 219 static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, 220 struct trace_pid_list *no_pid_list) 221 { 222 /* Return true if the pid list in type has pids */ 223 return ((type & TRACE_PIDS) && pid_list) || 224 ((type & TRACE_NO_PIDS) && no_pid_list); 225 } 226 227 static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, 228 struct trace_pid_list *no_pid_list) 229 { 230 /* 231 * Turning off what is in @type, return true if the "other" 232 * pid list, still has pids in it. 233 */ 234 return (!(type & TRACE_PIDS) && pid_list) || 235 (!(type & TRACE_NO_PIDS) && no_pid_list); 236 } 237 238 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 239 240 /** 241 * struct cond_snapshot - conditional snapshot data and callback 242 * 243 * The cond_snapshot structure encapsulates a callback function and 244 * data associated with the snapshot for a given tracing instance. 245 * 246 * When a snapshot is taken conditionally, by invoking 247 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 248 * passed in turn to the cond_snapshot.update() function. That data 249 * can be compared by the update() implementation with the cond_data 250 * contained within the struct cond_snapshot instance associated with 251 * the trace_array. Because the tr->max_lock is held throughout the 252 * update() call, the update() function can directly retrieve the 253 * cond_snapshot and cond_data associated with the per-instance 254 * snapshot associated with the trace_array. 255 * 256 * The cond_snapshot.update() implementation can save data to be 257 * associated with the snapshot if it decides to, and returns 'true' 258 * in that case, or it returns 'false' if the conditional snapshot 259 * shouldn't be taken. 260 * 261 * The cond_snapshot instance is created and associated with the 262 * user-defined cond_data by tracing_cond_snapshot_enable(). 263 * Likewise, the cond_snapshot instance is destroyed and is no longer 264 * associated with the trace instance by 265 * tracing_cond_snapshot_disable(). 266 * 267 * The method below is required. 268 * 269 * @update: When a conditional snapshot is invoked, the update() 270 * callback function is invoked with the tr->max_lock held. The 271 * update() implementation signals whether or not to actually 272 * take the snapshot, by returning 'true' if so, 'false' if no 273 * snapshot should be taken. Because the max_lock is held for 274 * the duration of update(), the implementation is safe to 275 * directly retrieved and save any implementation data it needs 276 * to in association with the snapshot. 277 */ 278 struct cond_snapshot { 279 void *cond_data; 280 cond_update_fn_t update; 281 }; 282 283 /* 284 * The trace array - an array of per-CPU trace arrays. This is the 285 * highest level data structure that individual tracers deal with. 286 * They have on/off state as well: 287 */ 288 struct trace_array { 289 struct list_head list; 290 char *name; 291 struct array_buffer array_buffer; 292 #ifdef CONFIG_TRACER_MAX_TRACE 293 /* 294 * The max_buffer is used to snapshot the trace when a maximum 295 * latency is reached, or when the user initiates a snapshot. 296 * Some tracers will use this to store a maximum trace while 297 * it continues examining live traces. 298 * 299 * The buffers for the max_buffer are set up the same as the array_buffer 300 * When a snapshot is taken, the buffer of the max_buffer is swapped 301 * with the buffer of the array_buffer and the buffers are reset for 302 * the array_buffer so the tracing can continue. 303 */ 304 struct array_buffer max_buffer; 305 bool allocated_snapshot; 306 #endif 307 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) 308 unsigned long max_latency; 309 #ifdef CONFIG_FSNOTIFY 310 struct dentry *d_max_latency; 311 struct work_struct fsnotify_work; 312 struct irq_work fsnotify_irqwork; 313 #endif 314 #endif 315 struct trace_pid_list __rcu *filtered_pids; 316 struct trace_pid_list __rcu *filtered_no_pids; 317 /* 318 * max_lock is used to protect the swapping of buffers 319 * when taking a max snapshot. The buffers themselves are 320 * protected by per_cpu spinlocks. But the action of the swap 321 * needs its own lock. 322 * 323 * This is defined as a arch_spinlock_t in order to help 324 * with performance when lockdep debugging is enabled. 325 * 326 * It is also used in other places outside the update_max_tr 327 * so it needs to be defined outside of the 328 * CONFIG_TRACER_MAX_TRACE. 329 */ 330 arch_spinlock_t max_lock; 331 int buffer_disabled; 332 #ifdef CONFIG_FTRACE_SYSCALLS 333 int sys_refcount_enter; 334 int sys_refcount_exit; 335 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 336 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 337 #endif 338 int stop_count; 339 int clock_id; 340 int nr_topts; 341 bool clear_trace; 342 int buffer_percent; 343 unsigned int n_err_log_entries; 344 struct tracer *current_trace; 345 unsigned int trace_flags; 346 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 347 unsigned int flags; 348 raw_spinlock_t start_lock; 349 struct list_head err_log; 350 struct dentry *dir; 351 struct dentry *options; 352 struct dentry *percpu_dir; 353 struct dentry *event_dir; 354 struct trace_options *topts; 355 struct list_head systems; 356 struct list_head events; 357 struct trace_event_file *trace_marker_file; 358 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 359 int ref; 360 int trace_ref; 361 #ifdef CONFIG_FUNCTION_TRACER 362 struct ftrace_ops *ops; 363 struct trace_pid_list __rcu *function_pids; 364 struct trace_pid_list __rcu *function_no_pids; 365 #ifdef CONFIG_DYNAMIC_FTRACE 366 /* All of these are protected by the ftrace_lock */ 367 struct list_head func_probes; 368 struct list_head mod_trace; 369 struct list_head mod_notrace; 370 #endif 371 /* function tracing enabled */ 372 int function_enabled; 373 #endif 374 int time_stamp_abs_ref; 375 struct list_head hist_vars; 376 #ifdef CONFIG_TRACER_SNAPSHOT 377 struct cond_snapshot *cond_snapshot; 378 #endif 379 }; 380 381 enum { 382 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 383 }; 384 385 extern struct list_head ftrace_trace_arrays; 386 387 extern struct mutex trace_types_lock; 388 389 extern int trace_array_get(struct trace_array *tr); 390 extern int tracing_check_open_get_tr(struct trace_array *tr); 391 extern struct trace_array *trace_array_find(const char *instance); 392 extern struct trace_array *trace_array_find_get(const char *instance); 393 394 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs); 395 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 396 397 extern bool trace_clock_in_ns(struct trace_array *tr); 398 399 /* 400 * The global tracer (top) should be the first trace array added, 401 * but we check the flag anyway. 402 */ 403 static inline struct trace_array *top_trace_array(void) 404 { 405 struct trace_array *tr; 406 407 if (list_empty(&ftrace_trace_arrays)) 408 return NULL; 409 410 tr = list_entry(ftrace_trace_arrays.prev, 411 typeof(*tr), list); 412 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 413 return tr; 414 } 415 416 #define FTRACE_CMP_TYPE(var, type) \ 417 __builtin_types_compatible_p(typeof(var), type *) 418 419 #undef IF_ASSIGN 420 #define IF_ASSIGN(var, entry, etype, id) \ 421 if (FTRACE_CMP_TYPE(var, etype)) { \ 422 var = (typeof(var))(entry); \ 423 WARN_ON(id != 0 && (entry)->type != id); \ 424 break; \ 425 } 426 427 /* Will cause compile errors if type is not found. */ 428 extern void __ftrace_bad_type(void); 429 430 /* 431 * The trace_assign_type is a verifier that the entry type is 432 * the same as the type being assigned. To add new types simply 433 * add a line with the following format: 434 * 435 * IF_ASSIGN(var, ent, type, id); 436 * 437 * Where "type" is the trace type that includes the trace_entry 438 * as the "ent" item. And "id" is the trace identifier that is 439 * used in the trace_type enum. 440 * 441 * If the type can have more than one id, then use zero. 442 */ 443 #define trace_assign_type(var, ent) \ 444 do { \ 445 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 446 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 447 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 448 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 449 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 450 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 451 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 452 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 453 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 454 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 455 TRACE_MMIO_RW); \ 456 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 457 TRACE_MMIO_MAP); \ 458 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 459 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 460 TRACE_GRAPH_ENT); \ 461 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 462 TRACE_GRAPH_RET); \ 463 __ftrace_bad_type(); \ 464 } while (0) 465 466 /* 467 * An option specific to a tracer. This is a boolean value. 468 * The bit is the bit index that sets its value on the 469 * flags value in struct tracer_flags. 470 */ 471 struct tracer_opt { 472 const char *name; /* Will appear on the trace_options file */ 473 u32 bit; /* Mask assigned in val field in tracer_flags */ 474 }; 475 476 /* 477 * The set of specific options for a tracer. Your tracer 478 * have to set the initial value of the flags val. 479 */ 480 struct tracer_flags { 481 u32 val; 482 struct tracer_opt *opts; 483 struct tracer *trace; 484 }; 485 486 /* Makes more easy to define a tracer opt */ 487 #define TRACER_OPT(s, b) .name = #s, .bit = b 488 489 490 struct trace_option_dentry { 491 struct tracer_opt *opt; 492 struct tracer_flags *flags; 493 struct trace_array *tr; 494 struct dentry *entry; 495 }; 496 497 /** 498 * struct tracer - a specific tracer and its callbacks to interact with tracefs 499 * @name: the name chosen to select it on the available_tracers file 500 * @init: called when one switches to this tracer (echo name > current_tracer) 501 * @reset: called when one switches to another tracer 502 * @start: called when tracing is unpaused (echo 1 > tracing_on) 503 * @stop: called when tracing is paused (echo 0 > tracing_on) 504 * @update_thresh: called when tracing_thresh is updated 505 * @open: called when the trace file is opened 506 * @pipe_open: called when the trace_pipe file is opened 507 * @close: called when the trace file is released 508 * @pipe_close: called when the trace_pipe file is released 509 * @read: override the default read callback on trace_pipe 510 * @splice_read: override the default splice_read callback on trace_pipe 511 * @selftest: selftest to run on boot (see trace_selftest.c) 512 * @print_headers: override the first lines that describe your columns 513 * @print_line: callback that prints a trace 514 * @set_flag: signals one of your private flags changed (trace_options file) 515 * @flags: your private flags 516 */ 517 struct tracer { 518 const char *name; 519 int (*init)(struct trace_array *tr); 520 void (*reset)(struct trace_array *tr); 521 void (*start)(struct trace_array *tr); 522 void (*stop)(struct trace_array *tr); 523 int (*update_thresh)(struct trace_array *tr); 524 void (*open)(struct trace_iterator *iter); 525 void (*pipe_open)(struct trace_iterator *iter); 526 void (*close)(struct trace_iterator *iter); 527 void (*pipe_close)(struct trace_iterator *iter); 528 ssize_t (*read)(struct trace_iterator *iter, 529 struct file *filp, char __user *ubuf, 530 size_t cnt, loff_t *ppos); 531 ssize_t (*splice_read)(struct trace_iterator *iter, 532 struct file *filp, 533 loff_t *ppos, 534 struct pipe_inode_info *pipe, 535 size_t len, 536 unsigned int flags); 537 #ifdef CONFIG_FTRACE_STARTUP_TEST 538 int (*selftest)(struct tracer *trace, 539 struct trace_array *tr); 540 #endif 541 void (*print_header)(struct seq_file *m); 542 enum print_line_t (*print_line)(struct trace_iterator *iter); 543 /* If you handled the flag setting, return 0 */ 544 int (*set_flag)(struct trace_array *tr, 545 u32 old_flags, u32 bit, int set); 546 /* Return 0 if OK with change, else return non-zero */ 547 int (*flag_changed)(struct trace_array *tr, 548 u32 mask, int set); 549 struct tracer *next; 550 struct tracer_flags *flags; 551 int enabled; 552 bool print_max; 553 bool allow_instances; 554 #ifdef CONFIG_TRACER_MAX_TRACE 555 bool use_max_tr; 556 #endif 557 /* True if tracer cannot be enabled in kernel param */ 558 bool noboot; 559 }; 560 561 562 /* Only current can touch trace_recursion */ 563 564 /* 565 * For function tracing recursion: 566 * The order of these bits are important. 567 * 568 * When function tracing occurs, the following steps are made: 569 * If arch does not support a ftrace feature: 570 * call internal function (uses INTERNAL bits) which calls... 571 * If callback is registered to the "global" list, the list 572 * function is called and recursion checks the GLOBAL bits. 573 * then this function calls... 574 * The function callback, which can use the FTRACE bits to 575 * check for recursion. 576 * 577 * Now if the arch does not support a feature, and it calls 578 * the global list function which calls the ftrace callback 579 * all three of these steps will do a recursion protection. 580 * There's no reason to do one if the previous caller already 581 * did. The recursion that we are protecting against will 582 * go through the same steps again. 583 * 584 * To prevent the multiple recursion checks, if a recursion 585 * bit is set that is higher than the MAX bit of the current 586 * check, then we know that the check was made by the previous 587 * caller, and we can skip the current check. 588 */ 589 enum { 590 /* Function recursion bits */ 591 TRACE_FTRACE_BIT, 592 TRACE_FTRACE_NMI_BIT, 593 TRACE_FTRACE_IRQ_BIT, 594 TRACE_FTRACE_SIRQ_BIT, 595 596 /* INTERNAL_BITs must be greater than FTRACE_BITs */ 597 TRACE_INTERNAL_BIT, 598 TRACE_INTERNAL_NMI_BIT, 599 TRACE_INTERNAL_IRQ_BIT, 600 TRACE_INTERNAL_SIRQ_BIT, 601 602 TRACE_BRANCH_BIT, 603 /* 604 * Abuse of the trace_recursion. 605 * As we need a way to maintain state if we are tracing the function 606 * graph in irq because we want to trace a particular function that 607 * was called in irq context but we have irq tracing off. Since this 608 * can only be modified by current, we can reuse trace_recursion. 609 */ 610 TRACE_IRQ_BIT, 611 612 /* Set if the function is in the set_graph_function file */ 613 TRACE_GRAPH_BIT, 614 615 /* 616 * In the very unlikely case that an interrupt came in 617 * at a start of graph tracing, and we want to trace 618 * the function in that interrupt, the depth can be greater 619 * than zero, because of the preempted start of a previous 620 * trace. In an even more unlikely case, depth could be 2 621 * if a softirq interrupted the start of graph tracing, 622 * followed by an interrupt preempting a start of graph 623 * tracing in the softirq, and depth can even be 3 624 * if an NMI came in at the start of an interrupt function 625 * that preempted a softirq start of a function that 626 * preempted normal context!!!! Luckily, it can't be 627 * greater than 3, so the next two bits are a mask 628 * of what the depth is when we set TRACE_GRAPH_BIT 629 */ 630 631 TRACE_GRAPH_DEPTH_START_BIT, 632 TRACE_GRAPH_DEPTH_END_BIT, 633 634 /* 635 * To implement set_graph_notrace, if this bit is set, we ignore 636 * function graph tracing of called functions, until the return 637 * function is called to clear it. 638 */ 639 TRACE_GRAPH_NOTRACE_BIT, 640 }; 641 642 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 643 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 644 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 645 646 #define trace_recursion_depth() \ 647 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3) 648 #define trace_recursion_set_depth(depth) \ 649 do { \ 650 current->trace_recursion &= \ 651 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \ 652 current->trace_recursion |= \ 653 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \ 654 } while (0) 655 656 #define TRACE_CONTEXT_BITS 4 657 658 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 659 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 660 661 #define TRACE_LIST_START TRACE_INTERNAL_BIT 662 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 663 664 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 665 666 static __always_inline int trace_get_context_bit(void) 667 { 668 int bit; 669 670 if (in_interrupt()) { 671 if (in_nmi()) 672 bit = 0; 673 674 else if (in_irq()) 675 bit = 1; 676 else 677 bit = 2; 678 } else 679 bit = 3; 680 681 return bit; 682 } 683 684 static __always_inline int trace_test_and_set_recursion(int start, int max) 685 { 686 unsigned int val = current->trace_recursion; 687 int bit; 688 689 /* A previous recursion check was made */ 690 if ((val & TRACE_CONTEXT_MASK) > max) 691 return 0; 692 693 bit = trace_get_context_bit() + start; 694 if (unlikely(val & (1 << bit))) 695 return -1; 696 697 val |= 1 << bit; 698 current->trace_recursion = val; 699 barrier(); 700 701 return bit; 702 } 703 704 static __always_inline void trace_clear_recursion(int bit) 705 { 706 unsigned int val = current->trace_recursion; 707 708 if (!bit) 709 return; 710 711 bit = 1 << bit; 712 val &= ~bit; 713 714 barrier(); 715 current->trace_recursion = val; 716 } 717 718 static inline struct ring_buffer_iter * 719 trace_buffer_iter(struct trace_iterator *iter, int cpu) 720 { 721 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 722 } 723 724 int tracer_init(struct tracer *t, struct trace_array *tr); 725 int tracing_is_enabled(void); 726 void tracing_reset_online_cpus(struct array_buffer *buf); 727 void tracing_reset_current(int cpu); 728 void tracing_reset_all_online_cpus(void); 729 int tracing_open_generic(struct inode *inode, struct file *filp); 730 int tracing_open_generic_tr(struct inode *inode, struct file *filp); 731 bool tracing_is_disabled(void); 732 bool tracer_tracing_is_on(struct trace_array *tr); 733 void tracer_tracing_on(struct trace_array *tr); 734 void tracer_tracing_off(struct trace_array *tr); 735 struct dentry *trace_create_file(const char *name, 736 umode_t mode, 737 struct dentry *parent, 738 void *data, 739 const struct file_operations *fops); 740 741 int tracing_init_dentry(void); 742 743 struct ring_buffer_event; 744 745 struct ring_buffer_event * 746 trace_buffer_lock_reserve(struct trace_buffer *buffer, 747 int type, 748 unsigned long len, 749 unsigned long flags, 750 int pc); 751 752 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 753 struct trace_array_cpu *data); 754 755 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 756 int *ent_cpu, u64 *ent_ts); 757 758 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, 759 struct ring_buffer_event *event); 760 761 int trace_empty(struct trace_iterator *iter); 762 763 void *trace_find_next_entry_inc(struct trace_iterator *iter); 764 765 void trace_init_global_iter(struct trace_iterator *iter); 766 767 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 768 769 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 770 unsigned long trace_total_entries(struct trace_array *tr); 771 772 void trace_function(struct trace_array *tr, 773 unsigned long ip, 774 unsigned long parent_ip, 775 unsigned long flags, int pc); 776 void trace_graph_function(struct trace_array *tr, 777 unsigned long ip, 778 unsigned long parent_ip, 779 unsigned long flags, int pc); 780 void trace_latency_header(struct seq_file *m); 781 void trace_default_header(struct seq_file *m); 782 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 783 int trace_empty(struct trace_iterator *iter); 784 785 void trace_graph_return(struct ftrace_graph_ret *trace); 786 int trace_graph_entry(struct ftrace_graph_ent *trace); 787 void set_graph_array(struct trace_array *tr); 788 789 void tracing_start_cmdline_record(void); 790 void tracing_stop_cmdline_record(void); 791 void tracing_start_tgid_record(void); 792 void tracing_stop_tgid_record(void); 793 794 int register_tracer(struct tracer *type); 795 int is_tracing_stopped(void); 796 797 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 798 799 extern cpumask_var_t __read_mostly tracing_buffer_mask; 800 801 #define for_each_tracing_cpu(cpu) \ 802 for_each_cpu(cpu, tracing_buffer_mask) 803 804 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 805 806 extern unsigned long tracing_thresh; 807 808 /* PID filtering */ 809 810 extern int pid_max; 811 812 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 813 pid_t search_pid); 814 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 815 struct trace_pid_list *filtered_no_pids, 816 struct task_struct *task); 817 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 818 struct task_struct *self, 819 struct task_struct *task); 820 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 821 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 822 int trace_pid_show(struct seq_file *m, void *v); 823 void trace_free_pid_list(struct trace_pid_list *pid_list); 824 int trace_pid_write(struct trace_pid_list *filtered_pids, 825 struct trace_pid_list **new_pid_list, 826 const char __user *ubuf, size_t cnt); 827 828 #ifdef CONFIG_TRACER_MAX_TRACE 829 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 830 void *cond_data); 831 void update_max_tr_single(struct trace_array *tr, 832 struct task_struct *tsk, int cpu); 833 #endif /* CONFIG_TRACER_MAX_TRACE */ 834 835 #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ 836 defined(CONFIG_FSNOTIFY) 837 838 void latency_fsnotify(struct trace_array *tr); 839 840 #else 841 842 static inline void latency_fsnotify(struct trace_array *tr) { } 843 844 #endif 845 846 #ifdef CONFIG_STACKTRACE 847 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 848 int pc); 849 #else 850 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 851 int skip, int pc) 852 { 853 } 854 #endif /* CONFIG_STACKTRACE */ 855 856 extern u64 ftrace_now(int cpu); 857 858 extern void trace_find_cmdline(int pid, char comm[]); 859 extern int trace_find_tgid(int pid); 860 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 861 862 #ifdef CONFIG_DYNAMIC_FTRACE 863 extern unsigned long ftrace_update_tot_cnt; 864 extern unsigned long ftrace_number_of_pages; 865 extern unsigned long ftrace_number_of_groups; 866 void ftrace_init_trace_array(struct trace_array *tr); 867 #else 868 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 869 #endif 870 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 871 extern int DYN_FTRACE_TEST_NAME(void); 872 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 873 extern int DYN_FTRACE_TEST_NAME2(void); 874 875 extern bool ring_buffer_expanded; 876 extern bool tracing_selftest_disabled; 877 878 #ifdef CONFIG_FTRACE_STARTUP_TEST 879 extern int trace_selftest_startup_function(struct tracer *trace, 880 struct trace_array *tr); 881 extern int trace_selftest_startup_function_graph(struct tracer *trace, 882 struct trace_array *tr); 883 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 884 struct trace_array *tr); 885 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 886 struct trace_array *tr); 887 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 888 struct trace_array *tr); 889 extern int trace_selftest_startup_wakeup(struct tracer *trace, 890 struct trace_array *tr); 891 extern int trace_selftest_startup_nop(struct tracer *trace, 892 struct trace_array *tr); 893 extern int trace_selftest_startup_branch(struct tracer *trace, 894 struct trace_array *tr); 895 /* 896 * Tracer data references selftest functions that only occur 897 * on boot up. These can be __init functions. Thus, when selftests 898 * are enabled, then the tracers need to reference __init functions. 899 */ 900 #define __tracer_data __refdata 901 #else 902 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 903 #define __tracer_data __read_mostly 904 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 905 906 extern void *head_page(struct trace_array_cpu *data); 907 extern unsigned long long ns2usecs(u64 nsec); 908 extern int 909 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 910 extern int 911 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 912 extern int 913 trace_array_vprintk(struct trace_array *tr, 914 unsigned long ip, const char *fmt, va_list args); 915 int trace_array_printk_buf(struct trace_buffer *buffer, 916 unsigned long ip, const char *fmt, ...); 917 void trace_printk_seq(struct trace_seq *s); 918 enum print_line_t print_trace_line(struct trace_iterator *iter); 919 920 extern char trace_find_mark(unsigned long long duration); 921 922 struct ftrace_hash; 923 924 struct ftrace_mod_load { 925 struct list_head list; 926 char *func; 927 char *module; 928 int enable; 929 }; 930 931 enum { 932 FTRACE_HASH_FL_MOD = (1 << 0), 933 }; 934 935 struct ftrace_hash { 936 unsigned long size_bits; 937 struct hlist_head *buckets; 938 unsigned long count; 939 unsigned long flags; 940 struct rcu_head rcu; 941 }; 942 943 struct ftrace_func_entry * 944 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 945 946 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 947 { 948 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 949 } 950 951 /* Standard output formatting function used for function return traces */ 952 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 953 954 /* Flag options */ 955 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 956 #define TRACE_GRAPH_PRINT_CPU 0x2 957 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 958 #define TRACE_GRAPH_PRINT_PROC 0x8 959 #define TRACE_GRAPH_PRINT_DURATION 0x10 960 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 961 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 962 #define TRACE_GRAPH_PRINT_IRQS 0x80 963 #define TRACE_GRAPH_PRINT_TAIL 0x100 964 #define TRACE_GRAPH_SLEEP_TIME 0x200 965 #define TRACE_GRAPH_GRAPH_TIME 0x400 966 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 967 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 968 969 extern void ftrace_graph_sleep_time_control(bool enable); 970 971 #ifdef CONFIG_FUNCTION_PROFILER 972 extern void ftrace_graph_graph_time_control(bool enable); 973 #else 974 static inline void ftrace_graph_graph_time_control(bool enable) { } 975 #endif 976 977 extern enum print_line_t 978 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 979 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 980 extern void 981 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 982 extern void graph_trace_open(struct trace_iterator *iter); 983 extern void graph_trace_close(struct trace_iterator *iter); 984 extern int __trace_graph_entry(struct trace_array *tr, 985 struct ftrace_graph_ent *trace, 986 unsigned long flags, int pc); 987 extern void __trace_graph_return(struct trace_array *tr, 988 struct ftrace_graph_ret *trace, 989 unsigned long flags, int pc); 990 991 #ifdef CONFIG_DYNAMIC_FTRACE 992 extern struct ftrace_hash __rcu *ftrace_graph_hash; 993 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; 994 995 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 996 { 997 unsigned long addr = trace->func; 998 int ret = 0; 999 struct ftrace_hash *hash; 1000 1001 preempt_disable_notrace(); 1002 1003 /* 1004 * Have to open code "rcu_dereference_sched()" because the 1005 * function graph tracer can be called when RCU is not 1006 * "watching". 1007 * Protected with schedule_on_each_cpu(ftrace_sync) 1008 */ 1009 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); 1010 1011 if (ftrace_hash_empty(hash)) { 1012 ret = 1; 1013 goto out; 1014 } 1015 1016 if (ftrace_lookup_ip(hash, addr)) { 1017 1018 /* 1019 * This needs to be cleared on the return functions 1020 * when the depth is zero. 1021 */ 1022 trace_recursion_set(TRACE_GRAPH_BIT); 1023 trace_recursion_set_depth(trace->depth); 1024 1025 /* 1026 * If no irqs are to be traced, but a set_graph_function 1027 * is set, and called by an interrupt handler, we still 1028 * want to trace it. 1029 */ 1030 if (in_irq()) 1031 trace_recursion_set(TRACE_IRQ_BIT); 1032 else 1033 trace_recursion_clear(TRACE_IRQ_BIT); 1034 ret = 1; 1035 } 1036 1037 out: 1038 preempt_enable_notrace(); 1039 return ret; 1040 } 1041 1042 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 1043 { 1044 if (trace_recursion_test(TRACE_GRAPH_BIT) && 1045 trace->depth == trace_recursion_depth()) 1046 trace_recursion_clear(TRACE_GRAPH_BIT); 1047 } 1048 1049 static inline int ftrace_graph_notrace_addr(unsigned long addr) 1050 { 1051 int ret = 0; 1052 struct ftrace_hash *notrace_hash; 1053 1054 preempt_disable_notrace(); 1055 1056 /* 1057 * Have to open code "rcu_dereference_sched()" because the 1058 * function graph tracer can be called when RCU is not 1059 * "watching". 1060 * Protected with schedule_on_each_cpu(ftrace_sync) 1061 */ 1062 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, 1063 !preemptible()); 1064 1065 if (ftrace_lookup_ip(notrace_hash, addr)) 1066 ret = 1; 1067 1068 preempt_enable_notrace(); 1069 return ret; 1070 } 1071 #else 1072 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 1073 { 1074 return 1; 1075 } 1076 1077 static inline int ftrace_graph_notrace_addr(unsigned long addr) 1078 { 1079 return 0; 1080 } 1081 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 1082 { } 1083 #endif /* CONFIG_DYNAMIC_FTRACE */ 1084 1085 extern unsigned int fgraph_max_depth; 1086 1087 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 1088 { 1089 /* trace it when it is-nested-in or is a function enabled. */ 1090 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 1091 ftrace_graph_addr(trace)) || 1092 (trace->depth < 0) || 1093 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 1094 } 1095 1096 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 1097 static inline enum print_line_t 1098 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 1099 { 1100 return TRACE_TYPE_UNHANDLED; 1101 } 1102 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 1103 1104 extern struct list_head ftrace_pids; 1105 1106 #ifdef CONFIG_FUNCTION_TRACER 1107 1108 #define FTRACE_PID_IGNORE -1 1109 #define FTRACE_PID_TRACE -2 1110 1111 struct ftrace_func_command { 1112 struct list_head list; 1113 char *name; 1114 int (*func)(struct trace_array *tr, 1115 struct ftrace_hash *hash, 1116 char *func, char *cmd, 1117 char *params, int enable); 1118 }; 1119 extern bool ftrace_filter_param __initdata; 1120 static inline int ftrace_trace_task(struct trace_array *tr) 1121 { 1122 return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) != 1123 FTRACE_PID_IGNORE; 1124 } 1125 extern int ftrace_is_dead(void); 1126 int ftrace_create_function_files(struct trace_array *tr, 1127 struct dentry *parent); 1128 void ftrace_destroy_function_files(struct trace_array *tr); 1129 int ftrace_allocate_ftrace_ops(struct trace_array *tr); 1130 void ftrace_free_ftrace_ops(struct trace_array *tr); 1131 void ftrace_init_global_array_ops(struct trace_array *tr); 1132 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 1133 void ftrace_reset_array_ops(struct trace_array *tr); 1134 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 1135 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1136 struct dentry *d_tracer); 1137 void ftrace_clear_pids(struct trace_array *tr); 1138 int init_function_trace(void); 1139 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1140 #else 1141 static inline int ftrace_trace_task(struct trace_array *tr) 1142 { 1143 return 1; 1144 } 1145 static inline int ftrace_is_dead(void) { return 0; } 1146 static inline int 1147 ftrace_create_function_files(struct trace_array *tr, 1148 struct dentry *parent) 1149 { 1150 return 0; 1151 } 1152 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) 1153 { 1154 return 0; 1155 } 1156 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } 1157 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1158 static inline __init void 1159 ftrace_init_global_array_ops(struct trace_array *tr) { } 1160 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1161 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1162 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1163 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1164 static inline int init_function_trace(void) { return 0; } 1165 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1166 /* ftace_func_t type is not defined, use macro instead of static inline */ 1167 #define ftrace_init_array_ops(tr, func) do { } while (0) 1168 #endif /* CONFIG_FUNCTION_TRACER */ 1169 1170 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1171 1172 struct ftrace_probe_ops { 1173 void (*func)(unsigned long ip, 1174 unsigned long parent_ip, 1175 struct trace_array *tr, 1176 struct ftrace_probe_ops *ops, 1177 void *data); 1178 int (*init)(struct ftrace_probe_ops *ops, 1179 struct trace_array *tr, 1180 unsigned long ip, void *init_data, 1181 void **data); 1182 void (*free)(struct ftrace_probe_ops *ops, 1183 struct trace_array *tr, 1184 unsigned long ip, void *data); 1185 int (*print)(struct seq_file *m, 1186 unsigned long ip, 1187 struct ftrace_probe_ops *ops, 1188 void *data); 1189 }; 1190 1191 struct ftrace_func_mapper; 1192 typedef int (*ftrace_mapper_func)(void *data); 1193 1194 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1195 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1196 unsigned long ip); 1197 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1198 unsigned long ip, void *data); 1199 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1200 unsigned long ip); 1201 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1202 ftrace_mapper_func free_func); 1203 1204 extern int 1205 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1206 struct ftrace_probe_ops *ops, void *data); 1207 extern int 1208 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1209 struct ftrace_probe_ops *ops); 1210 extern void clear_ftrace_function_probes(struct trace_array *tr); 1211 1212 int register_ftrace_command(struct ftrace_func_command *cmd); 1213 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1214 1215 void ftrace_create_filter_files(struct ftrace_ops *ops, 1216 struct dentry *parent); 1217 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1218 1219 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, 1220 int len, int reset); 1221 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, 1222 int len, int reset); 1223 #else 1224 struct ftrace_func_command; 1225 1226 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1227 { 1228 return -EINVAL; 1229 } 1230 static inline __init int unregister_ftrace_command(char *cmd_name) 1231 { 1232 return -EINVAL; 1233 } 1234 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1235 { 1236 } 1237 1238 /* 1239 * The ops parameter passed in is usually undefined. 1240 * This must be a macro. 1241 */ 1242 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1243 #define ftrace_destroy_filter_files(ops) do { } while (0) 1244 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1245 1246 bool ftrace_event_is_function(struct trace_event_call *call); 1247 1248 /* 1249 * struct trace_parser - servers for reading the user input separated by spaces 1250 * @cont: set if the input is not complete - no final space char was found 1251 * @buffer: holds the parsed user input 1252 * @idx: user input length 1253 * @size: buffer size 1254 */ 1255 struct trace_parser { 1256 bool cont; 1257 char *buffer; 1258 unsigned idx; 1259 unsigned size; 1260 }; 1261 1262 static inline bool trace_parser_loaded(struct trace_parser *parser) 1263 { 1264 return (parser->idx != 0); 1265 } 1266 1267 static inline bool trace_parser_cont(struct trace_parser *parser) 1268 { 1269 return parser->cont; 1270 } 1271 1272 static inline void trace_parser_clear(struct trace_parser *parser) 1273 { 1274 parser->cont = false; 1275 parser->idx = 0; 1276 } 1277 1278 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1279 extern void trace_parser_put(struct trace_parser *parser); 1280 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1281 size_t cnt, loff_t *ppos); 1282 1283 /* 1284 * Only create function graph options if function graph is configured. 1285 */ 1286 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1287 # define FGRAPH_FLAGS \ 1288 C(DISPLAY_GRAPH, "display-graph"), 1289 #else 1290 # define FGRAPH_FLAGS 1291 #endif 1292 1293 #ifdef CONFIG_BRANCH_TRACER 1294 # define BRANCH_FLAGS \ 1295 C(BRANCH, "branch"), 1296 #else 1297 # define BRANCH_FLAGS 1298 #endif 1299 1300 #ifdef CONFIG_FUNCTION_TRACER 1301 # define FUNCTION_FLAGS \ 1302 C(FUNCTION, "function-trace"), \ 1303 C(FUNC_FORK, "function-fork"), 1304 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1305 #else 1306 # define FUNCTION_FLAGS 1307 # define FUNCTION_DEFAULT_FLAGS 0UL 1308 # define TRACE_ITER_FUNC_FORK 0UL 1309 #endif 1310 1311 #ifdef CONFIG_STACKTRACE 1312 # define STACK_FLAGS \ 1313 C(STACKTRACE, "stacktrace"), 1314 #else 1315 # define STACK_FLAGS 1316 #endif 1317 1318 /* 1319 * trace_iterator_flags is an enumeration that defines bit 1320 * positions into trace_flags that controls the output. 1321 * 1322 * NOTE: These bits must match the trace_options array in 1323 * trace.c (this macro guarantees it). 1324 */ 1325 #define TRACE_FLAGS \ 1326 C(PRINT_PARENT, "print-parent"), \ 1327 C(SYM_OFFSET, "sym-offset"), \ 1328 C(SYM_ADDR, "sym-addr"), \ 1329 C(VERBOSE, "verbose"), \ 1330 C(RAW, "raw"), \ 1331 C(HEX, "hex"), \ 1332 C(BIN, "bin"), \ 1333 C(BLOCK, "block"), \ 1334 C(PRINTK, "trace_printk"), \ 1335 C(ANNOTATE, "annotate"), \ 1336 C(USERSTACKTRACE, "userstacktrace"), \ 1337 C(SYM_USEROBJ, "sym-userobj"), \ 1338 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1339 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1340 C(LATENCY_FMT, "latency-format"), \ 1341 C(RECORD_CMD, "record-cmd"), \ 1342 C(RECORD_TGID, "record-tgid"), \ 1343 C(OVERWRITE, "overwrite"), \ 1344 C(STOP_ON_FREE, "disable_on_free"), \ 1345 C(IRQ_INFO, "irq-info"), \ 1346 C(MARKERS, "markers"), \ 1347 C(EVENT_FORK, "event-fork"), \ 1348 C(PAUSE_ON_TRACE, "pause-on-trace"), \ 1349 FUNCTION_FLAGS \ 1350 FGRAPH_FLAGS \ 1351 STACK_FLAGS \ 1352 BRANCH_FLAGS 1353 1354 /* 1355 * By defining C, we can make TRACE_FLAGS a list of bit names 1356 * that will define the bits for the flag masks. 1357 */ 1358 #undef C 1359 #define C(a, b) TRACE_ITER_##a##_BIT 1360 1361 enum trace_iterator_bits { 1362 TRACE_FLAGS 1363 /* Make sure we don't go more than we have bits for */ 1364 TRACE_ITER_LAST_BIT 1365 }; 1366 1367 /* 1368 * By redefining C, we can make TRACE_FLAGS a list of masks that 1369 * use the bits as defined above. 1370 */ 1371 #undef C 1372 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1373 1374 enum trace_iterator_flags { TRACE_FLAGS }; 1375 1376 /* 1377 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1378 * control the output of kernel symbols. 1379 */ 1380 #define TRACE_ITER_SYM_MASK \ 1381 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1382 1383 extern struct tracer nop_trace; 1384 1385 #ifdef CONFIG_BRANCH_TRACER 1386 extern int enable_branch_tracing(struct trace_array *tr); 1387 extern void disable_branch_tracing(void); 1388 static inline int trace_branch_enable(struct trace_array *tr) 1389 { 1390 if (tr->trace_flags & TRACE_ITER_BRANCH) 1391 return enable_branch_tracing(tr); 1392 return 0; 1393 } 1394 static inline void trace_branch_disable(void) 1395 { 1396 /* due to races, always disable */ 1397 disable_branch_tracing(); 1398 } 1399 #else 1400 static inline int trace_branch_enable(struct trace_array *tr) 1401 { 1402 return 0; 1403 } 1404 static inline void trace_branch_disable(void) 1405 { 1406 } 1407 #endif /* CONFIG_BRANCH_TRACER */ 1408 1409 /* set ring buffers to default size if not already done so */ 1410 int tracing_update_buffers(void); 1411 1412 struct ftrace_event_field { 1413 struct list_head link; 1414 const char *name; 1415 const char *type; 1416 int filter_type; 1417 int offset; 1418 int size; 1419 int is_signed; 1420 }; 1421 1422 struct prog_entry; 1423 1424 struct event_filter { 1425 struct prog_entry __rcu *prog; 1426 char *filter_string; 1427 }; 1428 1429 struct event_subsystem { 1430 struct list_head list; 1431 const char *name; 1432 struct event_filter *filter; 1433 int ref_count; 1434 }; 1435 1436 struct trace_subsystem_dir { 1437 struct list_head list; 1438 struct event_subsystem *subsystem; 1439 struct trace_array *tr; 1440 struct dentry *entry; 1441 int ref_count; 1442 int nr_events; 1443 }; 1444 1445 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1446 struct trace_buffer *buffer, 1447 struct ring_buffer_event *event); 1448 1449 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1450 struct trace_buffer *buffer, 1451 struct ring_buffer_event *event, 1452 unsigned long flags, int pc, 1453 struct pt_regs *regs); 1454 1455 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1456 struct trace_buffer *buffer, 1457 struct ring_buffer_event *event, 1458 unsigned long flags, int pc) 1459 { 1460 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL); 1461 } 1462 1463 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1464 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1465 void trace_buffered_event_disable(void); 1466 void trace_buffered_event_enable(void); 1467 1468 static inline void 1469 __trace_event_discard_commit(struct trace_buffer *buffer, 1470 struct ring_buffer_event *event) 1471 { 1472 if (this_cpu_read(trace_buffered_event) == event) { 1473 /* Simply release the temp buffer */ 1474 this_cpu_dec(trace_buffered_event_cnt); 1475 return; 1476 } 1477 ring_buffer_discard_commit(buffer, event); 1478 } 1479 1480 /* 1481 * Helper function for event_trigger_unlock_commit{_regs}(). 1482 * If there are event triggers attached to this event that requires 1483 * filtering against its fields, then they will be called as the 1484 * entry already holds the field information of the current event. 1485 * 1486 * It also checks if the event should be discarded or not. 1487 * It is to be discarded if the event is soft disabled and the 1488 * event was only recorded to process triggers, or if the event 1489 * filter is active and this event did not match the filters. 1490 * 1491 * Returns true if the event is discarded, false otherwise. 1492 */ 1493 static inline bool 1494 __event_trigger_test_discard(struct trace_event_file *file, 1495 struct trace_buffer *buffer, 1496 struct ring_buffer_event *event, 1497 void *entry, 1498 enum event_trigger_type *tt) 1499 { 1500 unsigned long eflags = file->flags; 1501 1502 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1503 *tt = event_triggers_call(file, entry, event); 1504 1505 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || 1506 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && 1507 !filter_match_preds(file->filter, entry))) { 1508 __trace_event_discard_commit(buffer, event); 1509 return true; 1510 } 1511 1512 return false; 1513 } 1514 1515 /** 1516 * event_trigger_unlock_commit - handle triggers and finish event commit 1517 * @file: The file pointer assoctiated to the event 1518 * @buffer: The ring buffer that the event is being written to 1519 * @event: The event meta data in the ring buffer 1520 * @entry: The event itself 1521 * @irq_flags: The state of the interrupts at the start of the event 1522 * @pc: The state of the preempt count at the start of the event. 1523 * 1524 * This is a helper function to handle triggers that require data 1525 * from the event itself. It also tests the event against filters and 1526 * if the event is soft disabled and should be discarded. 1527 */ 1528 static inline void 1529 event_trigger_unlock_commit(struct trace_event_file *file, 1530 struct trace_buffer *buffer, 1531 struct ring_buffer_event *event, 1532 void *entry, unsigned long irq_flags, int pc) 1533 { 1534 enum event_trigger_type tt = ETT_NONE; 1535 1536 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1537 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc); 1538 1539 if (tt) 1540 event_triggers_post_call(file, tt); 1541 } 1542 1543 /** 1544 * event_trigger_unlock_commit_regs - handle triggers and finish event commit 1545 * @file: The file pointer assoctiated to the event 1546 * @buffer: The ring buffer that the event is being written to 1547 * @event: The event meta data in the ring buffer 1548 * @entry: The event itself 1549 * @irq_flags: The state of the interrupts at the start of the event 1550 * @pc: The state of the preempt count at the start of the event. 1551 * 1552 * This is a helper function to handle triggers that require data 1553 * from the event itself. It also tests the event against filters and 1554 * if the event is soft disabled and should be discarded. 1555 * 1556 * Same as event_trigger_unlock_commit() but calls 1557 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). 1558 */ 1559 static inline void 1560 event_trigger_unlock_commit_regs(struct trace_event_file *file, 1561 struct trace_buffer *buffer, 1562 struct ring_buffer_event *event, 1563 void *entry, unsigned long irq_flags, int pc, 1564 struct pt_regs *regs) 1565 { 1566 enum event_trigger_type tt = ETT_NONE; 1567 1568 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1569 trace_buffer_unlock_commit_regs(file->tr, buffer, event, 1570 irq_flags, pc, regs); 1571 1572 if (tt) 1573 event_triggers_post_call(file, tt); 1574 } 1575 1576 #define FILTER_PRED_INVALID ((unsigned short)-1) 1577 #define FILTER_PRED_IS_RIGHT (1 << 15) 1578 #define FILTER_PRED_FOLD (1 << 15) 1579 1580 /* 1581 * The max preds is the size of unsigned short with 1582 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1583 * and FOLD flags. The other is reserved. 1584 * 1585 * 2^14 preds is way more than enough. 1586 */ 1587 #define MAX_FILTER_PRED 16384 1588 1589 struct filter_pred; 1590 struct regex; 1591 1592 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1593 1594 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1595 1596 enum regex_type { 1597 MATCH_FULL = 0, 1598 MATCH_FRONT_ONLY, 1599 MATCH_MIDDLE_ONLY, 1600 MATCH_END_ONLY, 1601 MATCH_GLOB, 1602 MATCH_INDEX, 1603 }; 1604 1605 struct regex { 1606 char pattern[MAX_FILTER_STR_VAL]; 1607 int len; 1608 int field_len; 1609 regex_match_func match; 1610 }; 1611 1612 struct filter_pred { 1613 filter_pred_fn_t fn; 1614 u64 val; 1615 struct regex regex; 1616 unsigned short *ops; 1617 struct ftrace_event_field *field; 1618 int offset; 1619 int not; 1620 int op; 1621 }; 1622 1623 static inline bool is_string_field(struct ftrace_event_field *field) 1624 { 1625 return field->filter_type == FILTER_DYN_STRING || 1626 field->filter_type == FILTER_STATIC_STRING || 1627 field->filter_type == FILTER_PTR_STRING || 1628 field->filter_type == FILTER_COMM; 1629 } 1630 1631 static inline bool is_function_field(struct ftrace_event_field *field) 1632 { 1633 return field->filter_type == FILTER_TRACE_FN; 1634 } 1635 1636 extern enum regex_type 1637 filter_parse_regex(char *buff, int len, char **search, int *not); 1638 extern void print_event_filter(struct trace_event_file *file, 1639 struct trace_seq *s); 1640 extern int apply_event_filter(struct trace_event_file *file, 1641 char *filter_string); 1642 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1643 char *filter_string); 1644 extern void print_subsystem_event_filter(struct event_subsystem *system, 1645 struct trace_seq *s); 1646 extern int filter_assign_type(const char *type); 1647 extern int create_event_filter(struct trace_array *tr, 1648 struct trace_event_call *call, 1649 char *filter_str, bool set_str, 1650 struct event_filter **filterp); 1651 extern void free_event_filter(struct event_filter *filter); 1652 1653 struct ftrace_event_field * 1654 trace_find_event_field(struct trace_event_call *call, char *name); 1655 1656 extern void trace_event_enable_cmd_record(bool enable); 1657 extern void trace_event_enable_tgid_record(bool enable); 1658 1659 extern int event_trace_init(void); 1660 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1661 extern int event_trace_del_tracer(struct trace_array *tr); 1662 extern void __trace_early_add_events(struct trace_array *tr); 1663 1664 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1665 const char *system, 1666 const char *event); 1667 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1668 const char *system, 1669 const char *event); 1670 1671 static inline void *event_file_data(struct file *filp) 1672 { 1673 return READ_ONCE(file_inode(filp)->i_private); 1674 } 1675 1676 extern struct mutex event_mutex; 1677 extern struct list_head ftrace_events; 1678 1679 extern const struct file_operations event_trigger_fops; 1680 extern const struct file_operations event_hist_fops; 1681 extern const struct file_operations event_hist_debug_fops; 1682 extern const struct file_operations event_inject_fops; 1683 1684 #ifdef CONFIG_HIST_TRIGGERS 1685 extern int register_trigger_hist_cmd(void); 1686 extern int register_trigger_hist_enable_disable_cmds(void); 1687 #else 1688 static inline int register_trigger_hist_cmd(void) { return 0; } 1689 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1690 #endif 1691 1692 extern int register_trigger_cmds(void); 1693 extern void clear_event_triggers(struct trace_array *tr); 1694 1695 struct event_trigger_data { 1696 unsigned long count; 1697 int ref; 1698 struct event_trigger_ops *ops; 1699 struct event_command *cmd_ops; 1700 struct event_filter __rcu *filter; 1701 char *filter_str; 1702 void *private_data; 1703 bool paused; 1704 bool paused_tmp; 1705 struct list_head list; 1706 char *name; 1707 struct list_head named_list; 1708 struct event_trigger_data *named_data; 1709 }; 1710 1711 /* Avoid typos */ 1712 #define ENABLE_EVENT_STR "enable_event" 1713 #define DISABLE_EVENT_STR "disable_event" 1714 #define ENABLE_HIST_STR "enable_hist" 1715 #define DISABLE_HIST_STR "disable_hist" 1716 1717 struct enable_trigger_data { 1718 struct trace_event_file *file; 1719 bool enable; 1720 bool hist; 1721 }; 1722 1723 extern int event_enable_trigger_print(struct seq_file *m, 1724 struct event_trigger_ops *ops, 1725 struct event_trigger_data *data); 1726 extern void event_enable_trigger_free(struct event_trigger_ops *ops, 1727 struct event_trigger_data *data); 1728 extern int event_enable_trigger_func(struct event_command *cmd_ops, 1729 struct trace_event_file *file, 1730 char *glob, char *cmd, char *param); 1731 extern int event_enable_register_trigger(char *glob, 1732 struct event_trigger_ops *ops, 1733 struct event_trigger_data *data, 1734 struct trace_event_file *file); 1735 extern void event_enable_unregister_trigger(char *glob, 1736 struct event_trigger_ops *ops, 1737 struct event_trigger_data *test, 1738 struct trace_event_file *file); 1739 extern void trigger_data_free(struct event_trigger_data *data); 1740 extern int event_trigger_init(struct event_trigger_ops *ops, 1741 struct event_trigger_data *data); 1742 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1743 int trigger_enable); 1744 extern void update_cond_flag(struct trace_event_file *file); 1745 extern int set_trigger_filter(char *filter_str, 1746 struct event_trigger_data *trigger_data, 1747 struct trace_event_file *file); 1748 extern struct event_trigger_data *find_named_trigger(const char *name); 1749 extern bool is_named_trigger(struct event_trigger_data *test); 1750 extern int save_named_trigger(const char *name, 1751 struct event_trigger_data *data); 1752 extern void del_named_trigger(struct event_trigger_data *data); 1753 extern void pause_named_trigger(struct event_trigger_data *data); 1754 extern void unpause_named_trigger(struct event_trigger_data *data); 1755 extern void set_named_trigger_data(struct event_trigger_data *data, 1756 struct event_trigger_data *named_data); 1757 extern struct event_trigger_data * 1758 get_named_trigger_data(struct event_trigger_data *data); 1759 extern int register_event_command(struct event_command *cmd); 1760 extern int unregister_event_command(struct event_command *cmd); 1761 extern int register_trigger_hist_enable_disable_cmds(void); 1762 1763 /** 1764 * struct event_trigger_ops - callbacks for trace event triggers 1765 * 1766 * The methods in this structure provide per-event trigger hooks for 1767 * various trigger operations. 1768 * 1769 * All the methods below, except for @init() and @free(), must be 1770 * implemented. 1771 * 1772 * @func: The trigger 'probe' function called when the triggering 1773 * event occurs. The data passed into this callback is the data 1774 * that was supplied to the event_command @reg() function that 1775 * registered the trigger (see struct event_command) along with 1776 * the trace record, rec. 1777 * 1778 * @init: An optional initialization function called for the trigger 1779 * when the trigger is registered (via the event_command reg() 1780 * function). This can be used to perform per-trigger 1781 * initialization such as incrementing a per-trigger reference 1782 * count, for instance. This is usually implemented by the 1783 * generic utility function @event_trigger_init() (see 1784 * trace_event_triggers.c). 1785 * 1786 * @free: An optional de-initialization function called for the 1787 * trigger when the trigger is unregistered (via the 1788 * event_command @reg() function). This can be used to perform 1789 * per-trigger de-initialization such as decrementing a 1790 * per-trigger reference count and freeing corresponding trigger 1791 * data, for instance. This is usually implemented by the 1792 * generic utility function @event_trigger_free() (see 1793 * trace_event_triggers.c). 1794 * 1795 * @print: The callback function invoked to have the trigger print 1796 * itself. This is usually implemented by a wrapper function 1797 * that calls the generic utility function @event_trigger_print() 1798 * (see trace_event_triggers.c). 1799 */ 1800 struct event_trigger_ops { 1801 void (*func)(struct event_trigger_data *data, 1802 void *rec, 1803 struct ring_buffer_event *rbe); 1804 int (*init)(struct event_trigger_ops *ops, 1805 struct event_trigger_data *data); 1806 void (*free)(struct event_trigger_ops *ops, 1807 struct event_trigger_data *data); 1808 int (*print)(struct seq_file *m, 1809 struct event_trigger_ops *ops, 1810 struct event_trigger_data *data); 1811 }; 1812 1813 /** 1814 * struct event_command - callbacks and data members for event commands 1815 * 1816 * Event commands are invoked by users by writing the command name 1817 * into the 'trigger' file associated with a trace event. The 1818 * parameters associated with a specific invocation of an event 1819 * command are used to create an event trigger instance, which is 1820 * added to the list of trigger instances associated with that trace 1821 * event. When the event is hit, the set of triggers associated with 1822 * that event is invoked. 1823 * 1824 * The data members in this structure provide per-event command data 1825 * for various event commands. 1826 * 1827 * All the data members below, except for @post_trigger, must be set 1828 * for each event command. 1829 * 1830 * @name: The unique name that identifies the event command. This is 1831 * the name used when setting triggers via trigger files. 1832 * 1833 * @trigger_type: A unique id that identifies the event command 1834 * 'type'. This value has two purposes, the first to ensure that 1835 * only one trigger of the same type can be set at a given time 1836 * for a particular event e.g. it doesn't make sense to have both 1837 * a traceon and traceoff trigger attached to a single event at 1838 * the same time, so traceon and traceoff have the same type 1839 * though they have different names. The @trigger_type value is 1840 * also used as a bit value for deferring the actual trigger 1841 * action until after the current event is finished. Some 1842 * commands need to do this if they themselves log to the trace 1843 * buffer (see the @post_trigger() member below). @trigger_type 1844 * values are defined by adding new values to the trigger_type 1845 * enum in include/linux/trace_events.h. 1846 * 1847 * @flags: See the enum event_command_flags below. 1848 * 1849 * All the methods below, except for @set_filter() and @unreg_all(), 1850 * must be implemented. 1851 * 1852 * @func: The callback function responsible for parsing and 1853 * registering the trigger written to the 'trigger' file by the 1854 * user. It allocates the trigger instance and registers it with 1855 * the appropriate trace event. It makes use of the other 1856 * event_command callback functions to orchestrate this, and is 1857 * usually implemented by the generic utility function 1858 * @event_trigger_callback() (see trace_event_triggers.c). 1859 * 1860 * @reg: Adds the trigger to the list of triggers associated with the 1861 * event, and enables the event trigger itself, after 1862 * initializing it (via the event_trigger_ops @init() function). 1863 * This is also where commands can use the @trigger_type value to 1864 * make the decision as to whether or not multiple instances of 1865 * the trigger should be allowed. This is usually implemented by 1866 * the generic utility function @register_trigger() (see 1867 * trace_event_triggers.c). 1868 * 1869 * @unreg: Removes the trigger from the list of triggers associated 1870 * with the event, and disables the event trigger itself, after 1871 * initializing it (via the event_trigger_ops @free() function). 1872 * This is usually implemented by the generic utility function 1873 * @unregister_trigger() (see trace_event_triggers.c). 1874 * 1875 * @unreg_all: An optional function called to remove all the triggers 1876 * from the list of triggers associated with the event. Called 1877 * when a trigger file is opened in truncate mode. 1878 * 1879 * @set_filter: An optional function called to parse and set a filter 1880 * for the trigger. If no @set_filter() method is set for the 1881 * event command, filters set by the user for the command will be 1882 * ignored. This is usually implemented by the generic utility 1883 * function @set_trigger_filter() (see trace_event_triggers.c). 1884 * 1885 * @get_trigger_ops: The callback function invoked to retrieve the 1886 * event_trigger_ops implementation associated with the command. 1887 */ 1888 struct event_command { 1889 struct list_head list; 1890 char *name; 1891 enum event_trigger_type trigger_type; 1892 int flags; 1893 int (*func)(struct event_command *cmd_ops, 1894 struct trace_event_file *file, 1895 char *glob, char *cmd, char *params); 1896 int (*reg)(char *glob, 1897 struct event_trigger_ops *ops, 1898 struct event_trigger_data *data, 1899 struct trace_event_file *file); 1900 void (*unreg)(char *glob, 1901 struct event_trigger_ops *ops, 1902 struct event_trigger_data *data, 1903 struct trace_event_file *file); 1904 void (*unreg_all)(struct trace_event_file *file); 1905 int (*set_filter)(char *filter_str, 1906 struct event_trigger_data *data, 1907 struct trace_event_file *file); 1908 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1909 }; 1910 1911 /** 1912 * enum event_command_flags - flags for struct event_command 1913 * 1914 * @POST_TRIGGER: A flag that says whether or not this command needs 1915 * to have its action delayed until after the current event has 1916 * been closed. Some triggers need to avoid being invoked while 1917 * an event is currently in the process of being logged, since 1918 * the trigger may itself log data into the trace buffer. Thus 1919 * we make sure the current event is committed before invoking 1920 * those triggers. To do that, the trigger invocation is split 1921 * in two - the first part checks the filter using the current 1922 * trace record; if a command has the @post_trigger flag set, it 1923 * sets a bit for itself in the return value, otherwise it 1924 * directly invokes the trigger. Once all commands have been 1925 * either invoked or set their return flag, the current record is 1926 * either committed or discarded. At that point, if any commands 1927 * have deferred their triggers, those commands are finally 1928 * invoked following the close of the current event. In other 1929 * words, if the event_trigger_ops @func() probe implementation 1930 * itself logs to the trace buffer, this flag should be set, 1931 * otherwise it can be left unspecified. 1932 * 1933 * @NEEDS_REC: A flag that says whether or not this command needs 1934 * access to the trace record in order to perform its function, 1935 * regardless of whether or not it has a filter associated with 1936 * it (filters make a trigger require access to the trace record 1937 * but are not always present). 1938 */ 1939 enum event_command_flags { 1940 EVENT_CMD_FL_POST_TRIGGER = 1, 1941 EVENT_CMD_FL_NEEDS_REC = 2, 1942 }; 1943 1944 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1945 { 1946 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1947 } 1948 1949 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1950 { 1951 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1952 } 1953 1954 extern int trace_event_enable_disable(struct trace_event_file *file, 1955 int enable, int soft_disable); 1956 extern int tracing_alloc_snapshot(void); 1957 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1958 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1959 1960 extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1961 extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1962 1963 extern const char *__start___trace_bprintk_fmt[]; 1964 extern const char *__stop___trace_bprintk_fmt[]; 1965 1966 extern const char *__start___tracepoint_str[]; 1967 extern const char *__stop___tracepoint_str[]; 1968 1969 void trace_printk_control(bool enabled); 1970 void trace_printk_start_comm(void); 1971 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1972 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1973 1974 /* Used from boot time tracer */ 1975 extern int trace_set_options(struct trace_array *tr, char *option); 1976 extern int tracing_set_tracer(struct trace_array *tr, const char *buf); 1977 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr, 1978 unsigned long size, int cpu_id); 1979 extern int tracing_set_cpumask(struct trace_array *tr, 1980 cpumask_var_t tracing_cpumask_new); 1981 1982 1983 #define MAX_EVENT_NAME_LEN 64 1984 1985 extern int trace_run_command(const char *buf, int (*createfn)(int, char**)); 1986 extern ssize_t trace_parse_run_command(struct file *file, 1987 const char __user *buffer, size_t count, loff_t *ppos, 1988 int (*createfn)(int, char**)); 1989 1990 extern unsigned int err_pos(char *cmd, const char *str); 1991 extern void tracing_log_err(struct trace_array *tr, 1992 const char *loc, const char *cmd, 1993 const char **errs, u8 type, u8 pos); 1994 1995 /* 1996 * Normal trace_printk() and friends allocates special buffers 1997 * to do the manipulation, as well as saves the print formats 1998 * into sections to display. But the trace infrastructure wants 1999 * to use these without the added overhead at the price of being 2000 * a bit slower (used mainly for warnings, where we don't care 2001 * about performance). The internal_trace_puts() is for such 2002 * a purpose. 2003 */ 2004 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 2005 2006 #undef FTRACE_ENTRY 2007 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 2008 extern struct trace_event_call \ 2009 __aligned(4) event_##call; 2010 #undef FTRACE_ENTRY_DUP 2011 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 2012 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 2013 #undef FTRACE_ENTRY_PACKED 2014 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \ 2015 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 2016 2017 #include "trace_entries.h" 2018 2019 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 2020 int perf_ftrace_event_register(struct trace_event_call *call, 2021 enum trace_reg type, void *data); 2022 #else 2023 #define perf_ftrace_event_register NULL 2024 #endif 2025 2026 #ifdef CONFIG_FTRACE_SYSCALLS 2027 void init_ftrace_syscalls(void); 2028 const char *get_syscall_name(int syscall); 2029 #else 2030 static inline void init_ftrace_syscalls(void) { } 2031 static inline const char *get_syscall_name(int syscall) 2032 { 2033 return NULL; 2034 } 2035 #endif 2036 2037 #ifdef CONFIG_EVENT_TRACING 2038 void trace_event_init(void); 2039 void trace_event_eval_update(struct trace_eval_map **map, int len); 2040 /* Used from boot time tracer */ 2041 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); 2042 extern int trigger_process_regex(struct trace_event_file *file, char *buff); 2043 #else 2044 static inline void __init trace_event_init(void) { } 2045 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 2046 #endif 2047 2048 #ifdef CONFIG_TRACER_SNAPSHOT 2049 void tracing_snapshot_instance(struct trace_array *tr); 2050 int tracing_alloc_snapshot_instance(struct trace_array *tr); 2051 #else 2052 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 2053 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 2054 { 2055 return 0; 2056 } 2057 #endif 2058 2059 #ifdef CONFIG_PREEMPT_TRACER 2060 void tracer_preempt_on(unsigned long a0, unsigned long a1); 2061 void tracer_preempt_off(unsigned long a0, unsigned long a1); 2062 #else 2063 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 2064 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 2065 #endif 2066 #ifdef CONFIG_IRQSOFF_TRACER 2067 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 2068 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 2069 #else 2070 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 2071 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 2072 #endif 2073 2074 extern struct trace_iterator *tracepoint_print_iter; 2075 2076 /* 2077 * Reset the state of the trace_iterator so that it can read consumed data. 2078 * Normally, the trace_iterator is used for reading the data when it is not 2079 * consumed, and must retain state. 2080 */ 2081 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 2082 { 2083 const size_t offset = offsetof(struct trace_iterator, seq); 2084 2085 /* 2086 * Keep gcc from complaining about overwriting more than just one 2087 * member in the structure. 2088 */ 2089 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset); 2090 2091 iter->pos = -1; 2092 } 2093 2094 /* Check the name is good for event/group/fields */ 2095 static inline bool is_good_name(const char *name) 2096 { 2097 if (!isalpha(*name) && *name != '_') 2098 return false; 2099 while (*++name != '\0') { 2100 if (!isalpha(*name) && !isdigit(*name) && *name != '_') 2101 return false; 2102 } 2103 return true; 2104 } 2105 2106 #endif /* _LINUX_KERNEL_TRACE_H */ 2107