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 23 #ifdef CONFIG_FTRACE_SYSCALLS 24 #include <asm/unistd.h> /* For NR_SYSCALLS */ 25 #include <asm/syscall.h> /* some archs define it here */ 26 #endif 27 28 enum trace_type { 29 __TRACE_FIRST_TYPE = 0, 30 31 TRACE_FN, 32 TRACE_CTX, 33 TRACE_WAKE, 34 TRACE_STACK, 35 TRACE_PRINT, 36 TRACE_BPRINT, 37 TRACE_MMIO_RW, 38 TRACE_MMIO_MAP, 39 TRACE_BRANCH, 40 TRACE_GRAPH_RET, 41 TRACE_GRAPH_ENT, 42 TRACE_USER_STACK, 43 TRACE_BLK, 44 TRACE_BPUTS, 45 TRACE_HWLAT, 46 TRACE_RAW_DATA, 47 48 __TRACE_LAST_TYPE, 49 }; 50 51 52 #undef __field 53 #define __field(type, item) type item; 54 55 #undef __field_struct 56 #define __field_struct(type, item) __field(type, item) 57 58 #undef __field_desc 59 #define __field_desc(type, container, item) 60 61 #undef __array 62 #define __array(type, item, size) type item[size]; 63 64 #undef __array_desc 65 #define __array_desc(type, container, item, size) 66 67 #undef __dynamic_array 68 #define __dynamic_array(type, item) type item[]; 69 70 #undef F_STRUCT 71 #define F_STRUCT(args...) args 72 73 #undef FTRACE_ENTRY 74 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 75 struct struct_name { \ 76 struct trace_entry ent; \ 77 tstruct \ 78 } 79 80 #undef FTRACE_ENTRY_DUP 81 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) 82 83 #undef FTRACE_ENTRY_REG 84 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 85 filter, regfn) \ 86 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 87 filter) 88 89 #undef FTRACE_ENTRY_PACKED 90 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \ 91 filter) \ 92 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 93 filter) __packed 94 95 #include "trace_entries.h" 96 97 /* 98 * syscalls are special, and need special handling, this is why 99 * they are not included in trace_entries.h 100 */ 101 struct syscall_trace_enter { 102 struct trace_entry ent; 103 int nr; 104 unsigned long args[]; 105 }; 106 107 struct syscall_trace_exit { 108 struct trace_entry ent; 109 int nr; 110 long ret; 111 }; 112 113 struct kprobe_trace_entry_head { 114 struct trace_entry ent; 115 unsigned long ip; 116 }; 117 118 struct kretprobe_trace_entry_head { 119 struct trace_entry ent; 120 unsigned long func; 121 unsigned long ret_ip; 122 }; 123 124 /* 125 * trace_flag_type is an enumeration that holds different 126 * states when a trace occurs. These are: 127 * IRQS_OFF - interrupts were disabled 128 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 129 * NEED_RESCHED - reschedule is requested 130 * HARDIRQ - inside an interrupt handler 131 * SOFTIRQ - inside a softirq handler 132 */ 133 enum trace_flag_type { 134 TRACE_FLAG_IRQS_OFF = 0x01, 135 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 136 TRACE_FLAG_NEED_RESCHED = 0x04, 137 TRACE_FLAG_HARDIRQ = 0x08, 138 TRACE_FLAG_SOFTIRQ = 0x10, 139 TRACE_FLAG_PREEMPT_RESCHED = 0x20, 140 TRACE_FLAG_NMI = 0x40, 141 }; 142 143 #define TRACE_BUF_SIZE 1024 144 145 struct trace_array; 146 147 /* 148 * The CPU trace array - it consists of thousands of trace entries 149 * plus some other descriptor data: (for example which task started 150 * the trace, etc.) 151 */ 152 struct trace_array_cpu { 153 atomic_t disabled; 154 void *buffer_page; /* ring buffer spare */ 155 156 unsigned long entries; 157 unsigned long saved_latency; 158 unsigned long critical_start; 159 unsigned long critical_end; 160 unsigned long critical_sequence; 161 unsigned long nice; 162 unsigned long policy; 163 unsigned long rt_priority; 164 unsigned long skipped_entries; 165 u64 preempt_timestamp; 166 pid_t pid; 167 kuid_t uid; 168 char comm[TASK_COMM_LEN]; 169 170 bool ignore_pid; 171 #ifdef CONFIG_FUNCTION_TRACER 172 bool ftrace_ignore_pid; 173 #endif 174 }; 175 176 struct tracer; 177 struct trace_option_dentry; 178 179 struct trace_buffer { 180 struct trace_array *tr; 181 struct ring_buffer *buffer; 182 struct trace_array_cpu __percpu *data; 183 u64 time_start; 184 int cpu; 185 }; 186 187 #define TRACE_FLAGS_MAX_SIZE 32 188 189 struct trace_options { 190 struct tracer *tracer; 191 struct trace_option_dentry *topts; 192 }; 193 194 struct trace_pid_list { 195 int pid_max; 196 unsigned long *pids; 197 }; 198 199 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 200 201 /** 202 * struct cond_snapshot - conditional snapshot data and callback 203 * 204 * The cond_snapshot structure encapsulates a callback function and 205 * data associated with the snapshot for a given tracing instance. 206 * 207 * When a snapshot is taken conditionally, by invoking 208 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 209 * passed in turn to the cond_snapshot.update() function. That data 210 * can be compared by the update() implementation with the cond_data 211 * contained wihin the struct cond_snapshot instance associated with 212 * the trace_array. Because the tr->max_lock is held throughout the 213 * update() call, the update() function can directly retrieve the 214 * cond_snapshot and cond_data associated with the per-instance 215 * snapshot associated with the trace_array. 216 * 217 * The cond_snapshot.update() implementation can save data to be 218 * associated with the snapshot if it decides to, and returns 'true' 219 * in that case, or it returns 'false' if the conditional snapshot 220 * shouldn't be taken. 221 * 222 * The cond_snapshot instance is created and associated with the 223 * user-defined cond_data by tracing_cond_snapshot_enable(). 224 * Likewise, the cond_snapshot instance is destroyed and is no longer 225 * associated with the trace instance by 226 * tracing_cond_snapshot_disable(). 227 * 228 * The method below is required. 229 * 230 * @update: When a conditional snapshot is invoked, the update() 231 * callback function is invoked with the tr->max_lock held. The 232 * update() implementation signals whether or not to actually 233 * take the snapshot, by returning 'true' if so, 'false' if no 234 * snapshot should be taken. Because the max_lock is held for 235 * the duration of update(), the implementation is safe to 236 * directly retrieven and save any implementation data it needs 237 * to in association with the snapshot. 238 */ 239 struct cond_snapshot { 240 void *cond_data; 241 cond_update_fn_t update; 242 }; 243 244 /* 245 * The trace array - an array of per-CPU trace arrays. This is the 246 * highest level data structure that individual tracers deal with. 247 * They have on/off state as well: 248 */ 249 struct trace_array { 250 struct list_head list; 251 char *name; 252 struct trace_buffer trace_buffer; 253 #ifdef CONFIG_TRACER_MAX_TRACE 254 /* 255 * The max_buffer is used to snapshot the trace when a maximum 256 * latency is reached, or when the user initiates a snapshot. 257 * Some tracers will use this to store a maximum trace while 258 * it continues examining live traces. 259 * 260 * The buffers for the max_buffer are set up the same as the trace_buffer 261 * When a snapshot is taken, the buffer of the max_buffer is swapped 262 * with the buffer of the trace_buffer and the buffers are reset for 263 * the trace_buffer so the tracing can continue. 264 */ 265 struct trace_buffer max_buffer; 266 bool allocated_snapshot; 267 #endif 268 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) 269 unsigned long max_latency; 270 #ifdef CONFIG_FSNOTIFY 271 struct dentry *d_max_latency; 272 struct work_struct fsnotify_work; 273 struct irq_work fsnotify_irqwork; 274 #endif 275 #endif 276 struct trace_pid_list __rcu *filtered_pids; 277 /* 278 * max_lock is used to protect the swapping of buffers 279 * when taking a max snapshot. The buffers themselves are 280 * protected by per_cpu spinlocks. But the action of the swap 281 * needs its own lock. 282 * 283 * This is defined as a arch_spinlock_t in order to help 284 * with performance when lockdep debugging is enabled. 285 * 286 * It is also used in other places outside the update_max_tr 287 * so it needs to be defined outside of the 288 * CONFIG_TRACER_MAX_TRACE. 289 */ 290 arch_spinlock_t max_lock; 291 int buffer_disabled; 292 #ifdef CONFIG_FTRACE_SYSCALLS 293 int sys_refcount_enter; 294 int sys_refcount_exit; 295 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 296 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 297 #endif 298 int stop_count; 299 int clock_id; 300 int nr_topts; 301 bool clear_trace; 302 int buffer_percent; 303 unsigned int n_err_log_entries; 304 struct tracer *current_trace; 305 unsigned int trace_flags; 306 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 307 unsigned int flags; 308 raw_spinlock_t start_lock; 309 struct list_head err_log; 310 struct dentry *dir; 311 struct dentry *options; 312 struct dentry *percpu_dir; 313 struct dentry *event_dir; 314 struct trace_options *topts; 315 struct list_head systems; 316 struct list_head events; 317 struct trace_event_file *trace_marker_file; 318 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 319 int ref; 320 #ifdef CONFIG_FUNCTION_TRACER 321 struct ftrace_ops *ops; 322 struct trace_pid_list __rcu *function_pids; 323 #ifdef CONFIG_DYNAMIC_FTRACE 324 /* All of these are protected by the ftrace_lock */ 325 struct list_head func_probes; 326 struct list_head mod_trace; 327 struct list_head mod_notrace; 328 #endif 329 /* function tracing enabled */ 330 int function_enabled; 331 #endif 332 int time_stamp_abs_ref; 333 struct list_head hist_vars; 334 #ifdef CONFIG_TRACER_SNAPSHOT 335 struct cond_snapshot *cond_snapshot; 336 #endif 337 }; 338 339 enum { 340 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 341 }; 342 343 extern struct list_head ftrace_trace_arrays; 344 345 extern struct mutex trace_types_lock; 346 347 extern int trace_array_get(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 inline 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_buf(struct ring_buffer *buffer, 877 unsigned long ip, const char *fmt, ...); 878 void trace_printk_seq(struct trace_seq *s); 879 enum print_line_t print_trace_line(struct trace_iterator *iter); 880 881 extern char trace_find_mark(unsigned long long duration); 882 883 struct ftrace_hash; 884 885 struct ftrace_mod_load { 886 struct list_head list; 887 char *func; 888 char *module; 889 int enable; 890 }; 891 892 enum { 893 FTRACE_HASH_FL_MOD = (1 << 0), 894 }; 895 896 struct ftrace_hash { 897 unsigned long size_bits; 898 struct hlist_head *buckets; 899 unsigned long count; 900 unsigned long flags; 901 struct rcu_head rcu; 902 }; 903 904 struct ftrace_func_entry * 905 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 906 907 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 908 { 909 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 910 } 911 912 /* Standard output formatting function used for function return traces */ 913 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 914 915 /* Flag options */ 916 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 917 #define TRACE_GRAPH_PRINT_CPU 0x2 918 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 919 #define TRACE_GRAPH_PRINT_PROC 0x8 920 #define TRACE_GRAPH_PRINT_DURATION 0x10 921 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 922 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 923 #define TRACE_GRAPH_PRINT_IRQS 0x80 924 #define TRACE_GRAPH_PRINT_TAIL 0x100 925 #define TRACE_GRAPH_SLEEP_TIME 0x200 926 #define TRACE_GRAPH_GRAPH_TIME 0x400 927 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 928 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 929 930 extern void ftrace_graph_sleep_time_control(bool enable); 931 932 #ifdef CONFIG_FUNCTION_PROFILER 933 extern void ftrace_graph_graph_time_control(bool enable); 934 #else 935 static inline void ftrace_graph_graph_time_control(bool enable) { } 936 #endif 937 938 extern enum print_line_t 939 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 940 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 941 extern void 942 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 943 extern void graph_trace_open(struct trace_iterator *iter); 944 extern void graph_trace_close(struct trace_iterator *iter); 945 extern int __trace_graph_entry(struct trace_array *tr, 946 struct ftrace_graph_ent *trace, 947 unsigned long flags, int pc); 948 extern void __trace_graph_return(struct trace_array *tr, 949 struct ftrace_graph_ret *trace, 950 unsigned long flags, int pc); 951 952 #ifdef CONFIG_DYNAMIC_FTRACE 953 extern struct ftrace_hash *ftrace_graph_hash; 954 extern struct ftrace_hash *ftrace_graph_notrace_hash; 955 956 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 957 { 958 unsigned long addr = trace->func; 959 int ret = 0; 960 961 preempt_disable_notrace(); 962 963 if (ftrace_hash_empty(ftrace_graph_hash)) { 964 ret = 1; 965 goto out; 966 } 967 968 if (ftrace_lookup_ip(ftrace_graph_hash, addr)) { 969 970 /* 971 * This needs to be cleared on the return functions 972 * when the depth is zero. 973 */ 974 trace_recursion_set(TRACE_GRAPH_BIT); 975 trace_recursion_set_depth(trace->depth); 976 977 /* 978 * If no irqs are to be traced, but a set_graph_function 979 * is set, and called by an interrupt handler, we still 980 * want to trace it. 981 */ 982 if (in_irq()) 983 trace_recursion_set(TRACE_IRQ_BIT); 984 else 985 trace_recursion_clear(TRACE_IRQ_BIT); 986 ret = 1; 987 } 988 989 out: 990 preempt_enable_notrace(); 991 return ret; 992 } 993 994 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 995 { 996 if (trace_recursion_test(TRACE_GRAPH_BIT) && 997 trace->depth == trace_recursion_depth()) 998 trace_recursion_clear(TRACE_GRAPH_BIT); 999 } 1000 1001 static inline int ftrace_graph_notrace_addr(unsigned long addr) 1002 { 1003 int ret = 0; 1004 1005 preempt_disable_notrace(); 1006 1007 if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr)) 1008 ret = 1; 1009 1010 preempt_enable_notrace(); 1011 return ret; 1012 } 1013 #else 1014 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 1015 { 1016 return 1; 1017 } 1018 1019 static inline int ftrace_graph_notrace_addr(unsigned long addr) 1020 { 1021 return 0; 1022 } 1023 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 1024 { } 1025 #endif /* CONFIG_DYNAMIC_FTRACE */ 1026 1027 extern unsigned int fgraph_max_depth; 1028 1029 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 1030 { 1031 /* trace it when it is-nested-in or is a function enabled. */ 1032 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 1033 ftrace_graph_addr(trace)) || 1034 (trace->depth < 0) || 1035 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 1036 } 1037 1038 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 1039 static inline enum print_line_t 1040 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 1041 { 1042 return TRACE_TYPE_UNHANDLED; 1043 } 1044 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 1045 1046 extern struct list_head ftrace_pids; 1047 1048 #ifdef CONFIG_FUNCTION_TRACER 1049 struct ftrace_func_command { 1050 struct list_head list; 1051 char *name; 1052 int (*func)(struct trace_array *tr, 1053 struct ftrace_hash *hash, 1054 char *func, char *cmd, 1055 char *params, int enable); 1056 }; 1057 extern bool ftrace_filter_param __initdata; 1058 static inline int ftrace_trace_task(struct trace_array *tr) 1059 { 1060 return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid); 1061 } 1062 extern int ftrace_is_dead(void); 1063 int ftrace_create_function_files(struct trace_array *tr, 1064 struct dentry *parent); 1065 void ftrace_destroy_function_files(struct trace_array *tr); 1066 void ftrace_init_global_array_ops(struct trace_array *tr); 1067 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 1068 void ftrace_reset_array_ops(struct trace_array *tr); 1069 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 1070 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1071 struct dentry *d_tracer); 1072 void ftrace_clear_pids(struct trace_array *tr); 1073 int init_function_trace(void); 1074 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1075 #else 1076 static inline int ftrace_trace_task(struct trace_array *tr) 1077 { 1078 return 1; 1079 } 1080 static inline int ftrace_is_dead(void) { return 0; } 1081 static inline int 1082 ftrace_create_function_files(struct trace_array *tr, 1083 struct dentry *parent) 1084 { 1085 return 0; 1086 } 1087 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1088 static inline __init void 1089 ftrace_init_global_array_ops(struct trace_array *tr) { } 1090 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1091 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1092 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1093 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1094 static inline int init_function_trace(void) { return 0; } 1095 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1096 /* ftace_func_t type is not defined, use macro instead of static inline */ 1097 #define ftrace_init_array_ops(tr, func) do { } while (0) 1098 #endif /* CONFIG_FUNCTION_TRACER */ 1099 1100 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1101 1102 struct ftrace_probe_ops { 1103 void (*func)(unsigned long ip, 1104 unsigned long parent_ip, 1105 struct trace_array *tr, 1106 struct ftrace_probe_ops *ops, 1107 void *data); 1108 int (*init)(struct ftrace_probe_ops *ops, 1109 struct trace_array *tr, 1110 unsigned long ip, void *init_data, 1111 void **data); 1112 void (*free)(struct ftrace_probe_ops *ops, 1113 struct trace_array *tr, 1114 unsigned long ip, void *data); 1115 int (*print)(struct seq_file *m, 1116 unsigned long ip, 1117 struct ftrace_probe_ops *ops, 1118 void *data); 1119 }; 1120 1121 struct ftrace_func_mapper; 1122 typedef int (*ftrace_mapper_func)(void *data); 1123 1124 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1125 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1126 unsigned long ip); 1127 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1128 unsigned long ip, void *data); 1129 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1130 unsigned long ip); 1131 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1132 ftrace_mapper_func free_func); 1133 1134 extern int 1135 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1136 struct ftrace_probe_ops *ops, void *data); 1137 extern int 1138 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1139 struct ftrace_probe_ops *ops); 1140 extern void clear_ftrace_function_probes(struct trace_array *tr); 1141 1142 int register_ftrace_command(struct ftrace_func_command *cmd); 1143 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1144 1145 void ftrace_create_filter_files(struct ftrace_ops *ops, 1146 struct dentry *parent); 1147 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1148 #else 1149 struct ftrace_func_command; 1150 1151 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1152 { 1153 return -EINVAL; 1154 } 1155 static inline __init int unregister_ftrace_command(char *cmd_name) 1156 { 1157 return -EINVAL; 1158 } 1159 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1160 { 1161 } 1162 1163 /* 1164 * The ops parameter passed in is usually undefined. 1165 * This must be a macro. 1166 */ 1167 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1168 #define ftrace_destroy_filter_files(ops) do { } while (0) 1169 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1170 1171 bool ftrace_event_is_function(struct trace_event_call *call); 1172 1173 /* 1174 * struct trace_parser - servers for reading the user input separated by spaces 1175 * @cont: set if the input is not complete - no final space char was found 1176 * @buffer: holds the parsed user input 1177 * @idx: user input length 1178 * @size: buffer size 1179 */ 1180 struct trace_parser { 1181 bool cont; 1182 char *buffer; 1183 unsigned idx; 1184 unsigned size; 1185 }; 1186 1187 static inline bool trace_parser_loaded(struct trace_parser *parser) 1188 { 1189 return (parser->idx != 0); 1190 } 1191 1192 static inline bool trace_parser_cont(struct trace_parser *parser) 1193 { 1194 return parser->cont; 1195 } 1196 1197 static inline void trace_parser_clear(struct trace_parser *parser) 1198 { 1199 parser->cont = false; 1200 parser->idx = 0; 1201 } 1202 1203 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1204 extern void trace_parser_put(struct trace_parser *parser); 1205 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1206 size_t cnt, loff_t *ppos); 1207 1208 /* 1209 * Only create function graph options if function graph is configured. 1210 */ 1211 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1212 # define FGRAPH_FLAGS \ 1213 C(DISPLAY_GRAPH, "display-graph"), 1214 #else 1215 # define FGRAPH_FLAGS 1216 #endif 1217 1218 #ifdef CONFIG_BRANCH_TRACER 1219 # define BRANCH_FLAGS \ 1220 C(BRANCH, "branch"), 1221 #else 1222 # define BRANCH_FLAGS 1223 #endif 1224 1225 #ifdef CONFIG_FUNCTION_TRACER 1226 # define FUNCTION_FLAGS \ 1227 C(FUNCTION, "function-trace"), \ 1228 C(FUNC_FORK, "function-fork"), 1229 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1230 #else 1231 # define FUNCTION_FLAGS 1232 # define FUNCTION_DEFAULT_FLAGS 0UL 1233 # define TRACE_ITER_FUNC_FORK 0UL 1234 #endif 1235 1236 #ifdef CONFIG_STACKTRACE 1237 # define STACK_FLAGS \ 1238 C(STACKTRACE, "stacktrace"), 1239 #else 1240 # define STACK_FLAGS 1241 #endif 1242 1243 /* 1244 * trace_iterator_flags is an enumeration that defines bit 1245 * positions into trace_flags that controls the output. 1246 * 1247 * NOTE: These bits must match the trace_options array in 1248 * trace.c (this macro guarantees it). 1249 */ 1250 #define TRACE_FLAGS \ 1251 C(PRINT_PARENT, "print-parent"), \ 1252 C(SYM_OFFSET, "sym-offset"), \ 1253 C(SYM_ADDR, "sym-addr"), \ 1254 C(VERBOSE, "verbose"), \ 1255 C(RAW, "raw"), \ 1256 C(HEX, "hex"), \ 1257 C(BIN, "bin"), \ 1258 C(BLOCK, "block"), \ 1259 C(PRINTK, "trace_printk"), \ 1260 C(ANNOTATE, "annotate"), \ 1261 C(USERSTACKTRACE, "userstacktrace"), \ 1262 C(SYM_USEROBJ, "sym-userobj"), \ 1263 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1264 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1265 C(LATENCY_FMT, "latency-format"), \ 1266 C(RECORD_CMD, "record-cmd"), \ 1267 C(RECORD_TGID, "record-tgid"), \ 1268 C(OVERWRITE, "overwrite"), \ 1269 C(STOP_ON_FREE, "disable_on_free"), \ 1270 C(IRQ_INFO, "irq-info"), \ 1271 C(MARKERS, "markers"), \ 1272 C(EVENT_FORK, "event-fork"), \ 1273 FUNCTION_FLAGS \ 1274 FGRAPH_FLAGS \ 1275 STACK_FLAGS \ 1276 BRANCH_FLAGS 1277 1278 /* 1279 * By defining C, we can make TRACE_FLAGS a list of bit names 1280 * that will define the bits for the flag masks. 1281 */ 1282 #undef C 1283 #define C(a, b) TRACE_ITER_##a##_BIT 1284 1285 enum trace_iterator_bits { 1286 TRACE_FLAGS 1287 /* Make sure we don't go more than we have bits for */ 1288 TRACE_ITER_LAST_BIT 1289 }; 1290 1291 /* 1292 * By redefining C, we can make TRACE_FLAGS a list of masks that 1293 * use the bits as defined above. 1294 */ 1295 #undef C 1296 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1297 1298 enum trace_iterator_flags { TRACE_FLAGS }; 1299 1300 /* 1301 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1302 * control the output of kernel symbols. 1303 */ 1304 #define TRACE_ITER_SYM_MASK \ 1305 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1306 1307 extern struct tracer nop_trace; 1308 1309 #ifdef CONFIG_BRANCH_TRACER 1310 extern int enable_branch_tracing(struct trace_array *tr); 1311 extern void disable_branch_tracing(void); 1312 static inline int trace_branch_enable(struct trace_array *tr) 1313 { 1314 if (tr->trace_flags & TRACE_ITER_BRANCH) 1315 return enable_branch_tracing(tr); 1316 return 0; 1317 } 1318 static inline void trace_branch_disable(void) 1319 { 1320 /* due to races, always disable */ 1321 disable_branch_tracing(); 1322 } 1323 #else 1324 static inline int trace_branch_enable(struct trace_array *tr) 1325 { 1326 return 0; 1327 } 1328 static inline void trace_branch_disable(void) 1329 { 1330 } 1331 #endif /* CONFIG_BRANCH_TRACER */ 1332 1333 /* set ring buffers to default size if not already done so */ 1334 int tracing_update_buffers(void); 1335 1336 struct ftrace_event_field { 1337 struct list_head link; 1338 const char *name; 1339 const char *type; 1340 int filter_type; 1341 int offset; 1342 int size; 1343 int is_signed; 1344 }; 1345 1346 struct prog_entry; 1347 1348 struct event_filter { 1349 struct prog_entry __rcu *prog; 1350 char *filter_string; 1351 }; 1352 1353 struct event_subsystem { 1354 struct list_head list; 1355 const char *name; 1356 struct event_filter *filter; 1357 int ref_count; 1358 }; 1359 1360 struct trace_subsystem_dir { 1361 struct list_head list; 1362 struct event_subsystem *subsystem; 1363 struct trace_array *tr; 1364 struct dentry *entry; 1365 int ref_count; 1366 int nr_events; 1367 }; 1368 1369 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1370 struct ring_buffer *buffer, 1371 struct ring_buffer_event *event); 1372 1373 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1374 struct ring_buffer *buffer, 1375 struct ring_buffer_event *event, 1376 unsigned long flags, int pc, 1377 struct pt_regs *regs); 1378 1379 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1380 struct ring_buffer *buffer, 1381 struct ring_buffer_event *event, 1382 unsigned long flags, int pc) 1383 { 1384 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL); 1385 } 1386 1387 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1388 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1389 void trace_buffered_event_disable(void); 1390 void trace_buffered_event_enable(void); 1391 1392 static inline void 1393 __trace_event_discard_commit(struct ring_buffer *buffer, 1394 struct ring_buffer_event *event) 1395 { 1396 if (this_cpu_read(trace_buffered_event) == event) { 1397 /* Simply release the temp buffer */ 1398 this_cpu_dec(trace_buffered_event_cnt); 1399 return; 1400 } 1401 ring_buffer_discard_commit(buffer, event); 1402 } 1403 1404 /* 1405 * Helper function for event_trigger_unlock_commit{_regs}(). 1406 * If there are event triggers attached to this event that requires 1407 * filtering against its fields, then they wil be called as the 1408 * entry already holds the field information of the current event. 1409 * 1410 * It also checks if the event should be discarded or not. 1411 * It is to be discarded if the event is soft disabled and the 1412 * event was only recorded to process triggers, or if the event 1413 * filter is active and this event did not match the filters. 1414 * 1415 * Returns true if the event is discarded, false otherwise. 1416 */ 1417 static inline bool 1418 __event_trigger_test_discard(struct trace_event_file *file, 1419 struct ring_buffer *buffer, 1420 struct ring_buffer_event *event, 1421 void *entry, 1422 enum event_trigger_type *tt) 1423 { 1424 unsigned long eflags = file->flags; 1425 1426 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1427 *tt = event_triggers_call(file, entry, event); 1428 1429 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || 1430 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && 1431 !filter_match_preds(file->filter, entry))) { 1432 __trace_event_discard_commit(buffer, event); 1433 return true; 1434 } 1435 1436 return false; 1437 } 1438 1439 /** 1440 * event_trigger_unlock_commit - handle triggers and finish event commit 1441 * @file: The file pointer assoctiated to the event 1442 * @buffer: The ring buffer that the event is being written to 1443 * @event: The event meta data in the ring buffer 1444 * @entry: The event itself 1445 * @irq_flags: The state of the interrupts at the start of the event 1446 * @pc: The state of the preempt count at the start of the event. 1447 * 1448 * This is a helper function to handle triggers that require data 1449 * from the event itself. It also tests the event against filters and 1450 * if the event is soft disabled and should be discarded. 1451 */ 1452 static inline void 1453 event_trigger_unlock_commit(struct trace_event_file *file, 1454 struct ring_buffer *buffer, 1455 struct ring_buffer_event *event, 1456 void *entry, unsigned long irq_flags, int pc) 1457 { 1458 enum event_trigger_type tt = ETT_NONE; 1459 1460 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1461 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc); 1462 1463 if (tt) 1464 event_triggers_post_call(file, tt); 1465 } 1466 1467 /** 1468 * event_trigger_unlock_commit_regs - handle triggers and finish event commit 1469 * @file: The file pointer assoctiated to the event 1470 * @buffer: The ring buffer that the event is being written to 1471 * @event: The event meta data in the ring buffer 1472 * @entry: The event itself 1473 * @irq_flags: The state of the interrupts at the start of the event 1474 * @pc: The state of the preempt count at the start of the event. 1475 * 1476 * This is a helper function to handle triggers that require data 1477 * from the event itself. It also tests the event against filters and 1478 * if the event is soft disabled and should be discarded. 1479 * 1480 * Same as event_trigger_unlock_commit() but calls 1481 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). 1482 */ 1483 static inline void 1484 event_trigger_unlock_commit_regs(struct trace_event_file *file, 1485 struct ring_buffer *buffer, 1486 struct ring_buffer_event *event, 1487 void *entry, unsigned long irq_flags, int pc, 1488 struct pt_regs *regs) 1489 { 1490 enum event_trigger_type tt = ETT_NONE; 1491 1492 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1493 trace_buffer_unlock_commit_regs(file->tr, buffer, event, 1494 irq_flags, pc, regs); 1495 1496 if (tt) 1497 event_triggers_post_call(file, tt); 1498 } 1499 1500 #define FILTER_PRED_INVALID ((unsigned short)-1) 1501 #define FILTER_PRED_IS_RIGHT (1 << 15) 1502 #define FILTER_PRED_FOLD (1 << 15) 1503 1504 /* 1505 * The max preds is the size of unsigned short with 1506 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1507 * and FOLD flags. The other is reserved. 1508 * 1509 * 2^14 preds is way more than enough. 1510 */ 1511 #define MAX_FILTER_PRED 16384 1512 1513 struct filter_pred; 1514 struct regex; 1515 1516 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1517 1518 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1519 1520 enum regex_type { 1521 MATCH_FULL = 0, 1522 MATCH_FRONT_ONLY, 1523 MATCH_MIDDLE_ONLY, 1524 MATCH_END_ONLY, 1525 MATCH_GLOB, 1526 MATCH_INDEX, 1527 }; 1528 1529 struct regex { 1530 char pattern[MAX_FILTER_STR_VAL]; 1531 int len; 1532 int field_len; 1533 regex_match_func match; 1534 }; 1535 1536 struct filter_pred { 1537 filter_pred_fn_t fn; 1538 u64 val; 1539 struct regex regex; 1540 unsigned short *ops; 1541 struct ftrace_event_field *field; 1542 int offset; 1543 int not; 1544 int op; 1545 }; 1546 1547 static inline bool is_string_field(struct ftrace_event_field *field) 1548 { 1549 return field->filter_type == FILTER_DYN_STRING || 1550 field->filter_type == FILTER_STATIC_STRING || 1551 field->filter_type == FILTER_PTR_STRING || 1552 field->filter_type == FILTER_COMM; 1553 } 1554 1555 static inline bool is_function_field(struct ftrace_event_field *field) 1556 { 1557 return field->filter_type == FILTER_TRACE_FN; 1558 } 1559 1560 extern enum regex_type 1561 filter_parse_regex(char *buff, int len, char **search, int *not); 1562 extern void print_event_filter(struct trace_event_file *file, 1563 struct trace_seq *s); 1564 extern int apply_event_filter(struct trace_event_file *file, 1565 char *filter_string); 1566 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1567 char *filter_string); 1568 extern void print_subsystem_event_filter(struct event_subsystem *system, 1569 struct trace_seq *s); 1570 extern int filter_assign_type(const char *type); 1571 extern int create_event_filter(struct trace_array *tr, 1572 struct trace_event_call *call, 1573 char *filter_str, bool set_str, 1574 struct event_filter **filterp); 1575 extern void free_event_filter(struct event_filter *filter); 1576 1577 struct ftrace_event_field * 1578 trace_find_event_field(struct trace_event_call *call, char *name); 1579 1580 extern void trace_event_enable_cmd_record(bool enable); 1581 extern void trace_event_enable_tgid_record(bool enable); 1582 1583 extern int event_trace_init(void); 1584 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1585 extern int event_trace_del_tracer(struct trace_array *tr); 1586 1587 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1588 const char *system, 1589 const char *event); 1590 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1591 const char *system, 1592 const char *event); 1593 1594 static inline void *event_file_data(struct file *filp) 1595 { 1596 return READ_ONCE(file_inode(filp)->i_private); 1597 } 1598 1599 extern struct mutex event_mutex; 1600 extern struct list_head ftrace_events; 1601 1602 extern const struct file_operations event_trigger_fops; 1603 extern const struct file_operations event_hist_fops; 1604 extern const struct file_operations event_inject_fops; 1605 1606 #ifdef CONFIG_HIST_TRIGGERS 1607 extern int register_trigger_hist_cmd(void); 1608 extern int register_trigger_hist_enable_disable_cmds(void); 1609 #else 1610 static inline int register_trigger_hist_cmd(void) { return 0; } 1611 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1612 #endif 1613 1614 extern int register_trigger_cmds(void); 1615 extern void clear_event_triggers(struct trace_array *tr); 1616 1617 struct event_trigger_data { 1618 unsigned long count; 1619 int ref; 1620 struct event_trigger_ops *ops; 1621 struct event_command *cmd_ops; 1622 struct event_filter __rcu *filter; 1623 char *filter_str; 1624 void *private_data; 1625 bool paused; 1626 bool paused_tmp; 1627 struct list_head list; 1628 char *name; 1629 struct list_head named_list; 1630 struct event_trigger_data *named_data; 1631 }; 1632 1633 /* Avoid typos */ 1634 #define ENABLE_EVENT_STR "enable_event" 1635 #define DISABLE_EVENT_STR "disable_event" 1636 #define ENABLE_HIST_STR "enable_hist" 1637 #define DISABLE_HIST_STR "disable_hist" 1638 1639 struct enable_trigger_data { 1640 struct trace_event_file *file; 1641 bool enable; 1642 bool hist; 1643 }; 1644 1645 extern int event_enable_trigger_print(struct seq_file *m, 1646 struct event_trigger_ops *ops, 1647 struct event_trigger_data *data); 1648 extern void event_enable_trigger_free(struct event_trigger_ops *ops, 1649 struct event_trigger_data *data); 1650 extern int event_enable_trigger_func(struct event_command *cmd_ops, 1651 struct trace_event_file *file, 1652 char *glob, char *cmd, char *param); 1653 extern int event_enable_register_trigger(char *glob, 1654 struct event_trigger_ops *ops, 1655 struct event_trigger_data *data, 1656 struct trace_event_file *file); 1657 extern void event_enable_unregister_trigger(char *glob, 1658 struct event_trigger_ops *ops, 1659 struct event_trigger_data *test, 1660 struct trace_event_file *file); 1661 extern void trigger_data_free(struct event_trigger_data *data); 1662 extern int event_trigger_init(struct event_trigger_ops *ops, 1663 struct event_trigger_data *data); 1664 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1665 int trigger_enable); 1666 extern void update_cond_flag(struct trace_event_file *file); 1667 extern int set_trigger_filter(char *filter_str, 1668 struct event_trigger_data *trigger_data, 1669 struct trace_event_file *file); 1670 extern struct event_trigger_data *find_named_trigger(const char *name); 1671 extern bool is_named_trigger(struct event_trigger_data *test); 1672 extern int save_named_trigger(const char *name, 1673 struct event_trigger_data *data); 1674 extern void del_named_trigger(struct event_trigger_data *data); 1675 extern void pause_named_trigger(struct event_trigger_data *data); 1676 extern void unpause_named_trigger(struct event_trigger_data *data); 1677 extern void set_named_trigger_data(struct event_trigger_data *data, 1678 struct event_trigger_data *named_data); 1679 extern struct event_trigger_data * 1680 get_named_trigger_data(struct event_trigger_data *data); 1681 extern int register_event_command(struct event_command *cmd); 1682 extern int unregister_event_command(struct event_command *cmd); 1683 extern int register_trigger_hist_enable_disable_cmds(void); 1684 1685 /** 1686 * struct event_trigger_ops - callbacks for trace event triggers 1687 * 1688 * The methods in this structure provide per-event trigger hooks for 1689 * various trigger operations. 1690 * 1691 * All the methods below, except for @init() and @free(), must be 1692 * implemented. 1693 * 1694 * @func: The trigger 'probe' function called when the triggering 1695 * event occurs. The data passed into this callback is the data 1696 * that was supplied to the event_command @reg() function that 1697 * registered the trigger (see struct event_command) along with 1698 * the trace record, rec. 1699 * 1700 * @init: An optional initialization function called for the trigger 1701 * when the trigger is registered (via the event_command reg() 1702 * function). This can be used to perform per-trigger 1703 * initialization such as incrementing a per-trigger reference 1704 * count, for instance. This is usually implemented by the 1705 * generic utility function @event_trigger_init() (see 1706 * trace_event_triggers.c). 1707 * 1708 * @free: An optional de-initialization function called for the 1709 * trigger when the trigger is unregistered (via the 1710 * event_command @reg() function). This can be used to perform 1711 * per-trigger de-initialization such as decrementing a 1712 * per-trigger reference count and freeing corresponding trigger 1713 * data, for instance. This is usually implemented by the 1714 * generic utility function @event_trigger_free() (see 1715 * trace_event_triggers.c). 1716 * 1717 * @print: The callback function invoked to have the trigger print 1718 * itself. This is usually implemented by a wrapper function 1719 * that calls the generic utility function @event_trigger_print() 1720 * (see trace_event_triggers.c). 1721 */ 1722 struct event_trigger_ops { 1723 void (*func)(struct event_trigger_data *data, 1724 void *rec, 1725 struct ring_buffer_event *rbe); 1726 int (*init)(struct event_trigger_ops *ops, 1727 struct event_trigger_data *data); 1728 void (*free)(struct event_trigger_ops *ops, 1729 struct event_trigger_data *data); 1730 int (*print)(struct seq_file *m, 1731 struct event_trigger_ops *ops, 1732 struct event_trigger_data *data); 1733 }; 1734 1735 /** 1736 * struct event_command - callbacks and data members for event commands 1737 * 1738 * Event commands are invoked by users by writing the command name 1739 * into the 'trigger' file associated with a trace event. The 1740 * parameters associated with a specific invocation of an event 1741 * command are used to create an event trigger instance, which is 1742 * added to the list of trigger instances associated with that trace 1743 * event. When the event is hit, the set of triggers associated with 1744 * that event is invoked. 1745 * 1746 * The data members in this structure provide per-event command data 1747 * for various event commands. 1748 * 1749 * All the data members below, except for @post_trigger, must be set 1750 * for each event command. 1751 * 1752 * @name: The unique name that identifies the event command. This is 1753 * the name used when setting triggers via trigger files. 1754 * 1755 * @trigger_type: A unique id that identifies the event command 1756 * 'type'. This value has two purposes, the first to ensure that 1757 * only one trigger of the same type can be set at a given time 1758 * for a particular event e.g. it doesn't make sense to have both 1759 * a traceon and traceoff trigger attached to a single event at 1760 * the same time, so traceon and traceoff have the same type 1761 * though they have different names. The @trigger_type value is 1762 * also used as a bit value for deferring the actual trigger 1763 * action until after the current event is finished. Some 1764 * commands need to do this if they themselves log to the trace 1765 * buffer (see the @post_trigger() member below). @trigger_type 1766 * values are defined by adding new values to the trigger_type 1767 * enum in include/linux/trace_events.h. 1768 * 1769 * @flags: See the enum event_command_flags below. 1770 * 1771 * All the methods below, except for @set_filter() and @unreg_all(), 1772 * must be implemented. 1773 * 1774 * @func: The callback function responsible for parsing and 1775 * registering the trigger written to the 'trigger' file by the 1776 * user. It allocates the trigger instance and registers it with 1777 * the appropriate trace event. It makes use of the other 1778 * event_command callback functions to orchestrate this, and is 1779 * usually implemented by the generic utility function 1780 * @event_trigger_callback() (see trace_event_triggers.c). 1781 * 1782 * @reg: Adds the trigger to the list of triggers associated with the 1783 * event, and enables the event trigger itself, after 1784 * initializing it (via the event_trigger_ops @init() function). 1785 * This is also where commands can use the @trigger_type value to 1786 * make the decision as to whether or not multiple instances of 1787 * the trigger should be allowed. This is usually implemented by 1788 * the generic utility function @register_trigger() (see 1789 * trace_event_triggers.c). 1790 * 1791 * @unreg: Removes the trigger from the list of triggers associated 1792 * with the event, and disables the event trigger itself, after 1793 * initializing it (via the event_trigger_ops @free() function). 1794 * This is usually implemented by the generic utility function 1795 * @unregister_trigger() (see trace_event_triggers.c). 1796 * 1797 * @unreg_all: An optional function called to remove all the triggers 1798 * from the list of triggers associated with the event. Called 1799 * when a trigger file is opened in truncate mode. 1800 * 1801 * @set_filter: An optional function called to parse and set a filter 1802 * for the trigger. If no @set_filter() method is set for the 1803 * event command, filters set by the user for the command will be 1804 * ignored. This is usually implemented by the generic utility 1805 * function @set_trigger_filter() (see trace_event_triggers.c). 1806 * 1807 * @get_trigger_ops: The callback function invoked to retrieve the 1808 * event_trigger_ops implementation associated with the command. 1809 */ 1810 struct event_command { 1811 struct list_head list; 1812 char *name; 1813 enum event_trigger_type trigger_type; 1814 int flags; 1815 int (*func)(struct event_command *cmd_ops, 1816 struct trace_event_file *file, 1817 char *glob, char *cmd, char *params); 1818 int (*reg)(char *glob, 1819 struct event_trigger_ops *ops, 1820 struct event_trigger_data *data, 1821 struct trace_event_file *file); 1822 void (*unreg)(char *glob, 1823 struct event_trigger_ops *ops, 1824 struct event_trigger_data *data, 1825 struct trace_event_file *file); 1826 void (*unreg_all)(struct trace_event_file *file); 1827 int (*set_filter)(char *filter_str, 1828 struct event_trigger_data *data, 1829 struct trace_event_file *file); 1830 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1831 }; 1832 1833 /** 1834 * enum event_command_flags - flags for struct event_command 1835 * 1836 * @POST_TRIGGER: A flag that says whether or not this command needs 1837 * to have its action delayed until after the current event has 1838 * been closed. Some triggers need to avoid being invoked while 1839 * an event is currently in the process of being logged, since 1840 * the trigger may itself log data into the trace buffer. Thus 1841 * we make sure the current event is committed before invoking 1842 * those triggers. To do that, the trigger invocation is split 1843 * in two - the first part checks the filter using the current 1844 * trace record; if a command has the @post_trigger flag set, it 1845 * sets a bit for itself in the return value, otherwise it 1846 * directly invokes the trigger. Once all commands have been 1847 * either invoked or set their return flag, the current record is 1848 * either committed or discarded. At that point, if any commands 1849 * have deferred their triggers, those commands are finally 1850 * invoked following the close of the current event. In other 1851 * words, if the event_trigger_ops @func() probe implementation 1852 * itself logs to the trace buffer, this flag should be set, 1853 * otherwise it can be left unspecified. 1854 * 1855 * @NEEDS_REC: A flag that says whether or not this command needs 1856 * access to the trace record in order to perform its function, 1857 * regardless of whether or not it has a filter associated with 1858 * it (filters make a trigger require access to the trace record 1859 * but are not always present). 1860 */ 1861 enum event_command_flags { 1862 EVENT_CMD_FL_POST_TRIGGER = 1, 1863 EVENT_CMD_FL_NEEDS_REC = 2, 1864 }; 1865 1866 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1867 { 1868 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1869 } 1870 1871 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1872 { 1873 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1874 } 1875 1876 extern int trace_event_enable_disable(struct trace_event_file *file, 1877 int enable, int soft_disable); 1878 extern int tracing_alloc_snapshot(void); 1879 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1880 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1881 1882 extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1883 extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1884 1885 extern const char *__start___trace_bprintk_fmt[]; 1886 extern const char *__stop___trace_bprintk_fmt[]; 1887 1888 extern const char *__start___tracepoint_str[]; 1889 extern const char *__stop___tracepoint_str[]; 1890 1891 void trace_printk_control(bool enabled); 1892 void trace_printk_start_comm(void); 1893 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1894 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1895 1896 #define MAX_EVENT_NAME_LEN 64 1897 1898 extern int trace_run_command(const char *buf, int (*createfn)(int, char**)); 1899 extern ssize_t trace_parse_run_command(struct file *file, 1900 const char __user *buffer, size_t count, loff_t *ppos, 1901 int (*createfn)(int, char**)); 1902 1903 extern unsigned int err_pos(char *cmd, const char *str); 1904 extern void tracing_log_err(struct trace_array *tr, 1905 const char *loc, const char *cmd, 1906 const char **errs, u8 type, u8 pos); 1907 1908 /* 1909 * Normal trace_printk() and friends allocates special buffers 1910 * to do the manipulation, as well as saves the print formats 1911 * into sections to display. But the trace infrastructure wants 1912 * to use these without the added overhead at the price of being 1913 * a bit slower (used mainly for warnings, where we don't care 1914 * about performance). The internal_trace_puts() is for such 1915 * a purpose. 1916 */ 1917 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1918 1919 #undef FTRACE_ENTRY 1920 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1921 extern struct trace_event_call \ 1922 __aligned(4) event_##call; 1923 #undef FTRACE_ENTRY_DUP 1924 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1925 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1926 filter) 1927 #undef FTRACE_ENTRY_PACKED 1928 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \ 1929 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1930 filter) 1931 1932 #include "trace_entries.h" 1933 1934 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1935 int perf_ftrace_event_register(struct trace_event_call *call, 1936 enum trace_reg type, void *data); 1937 #else 1938 #define perf_ftrace_event_register NULL 1939 #endif 1940 1941 #ifdef CONFIG_FTRACE_SYSCALLS 1942 void init_ftrace_syscalls(void); 1943 const char *get_syscall_name(int syscall); 1944 #else 1945 static inline void init_ftrace_syscalls(void) { } 1946 static inline const char *get_syscall_name(int syscall) 1947 { 1948 return NULL; 1949 } 1950 #endif 1951 1952 #ifdef CONFIG_EVENT_TRACING 1953 void trace_event_init(void); 1954 void trace_event_eval_update(struct trace_eval_map **map, int len); 1955 #else 1956 static inline void __init trace_event_init(void) { } 1957 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1958 #endif 1959 1960 #ifdef CONFIG_TRACER_SNAPSHOT 1961 void tracing_snapshot_instance(struct trace_array *tr); 1962 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1963 #else 1964 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1965 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1966 { 1967 return 0; 1968 } 1969 #endif 1970 1971 #ifdef CONFIG_PREEMPT_TRACER 1972 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1973 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1974 #else 1975 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1976 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1977 #endif 1978 #ifdef CONFIG_IRQSOFF_TRACER 1979 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1980 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1981 #else 1982 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1983 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1984 #endif 1985 1986 extern struct trace_iterator *tracepoint_print_iter; 1987 1988 /* 1989 * Reset the state of the trace_iterator so that it can read consumed data. 1990 * Normally, the trace_iterator is used for reading the data when it is not 1991 * consumed, and must retain state. 1992 */ 1993 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 1994 { 1995 const size_t offset = offsetof(struct trace_iterator, seq); 1996 1997 /* 1998 * Keep gcc from complaining about overwriting more than just one 1999 * member in the structure. 2000 */ 2001 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset); 2002 2003 iter->pos = -1; 2004 } 2005 2006 #endif /* _LINUX_KERNEL_TRACE_H */ 2007