1 // SPDX-License-Identifier: GPL-2.0 2 3 #ifndef _LINUX_KERNEL_TRACE_H 4 #define _LINUX_KERNEL_TRACE_H 5 6 #include <linux/fs.h> 7 #include <linux/atomic.h> 8 #include <linux/sched.h> 9 #include <linux/clocksource.h> 10 #include <linux/ring_buffer.h> 11 #include <linux/mmiotrace.h> 12 #include <linux/tracepoint.h> 13 #include <linux/ftrace.h> 14 #include <linux/hw_breakpoint.h> 15 #include <linux/trace_seq.h> 16 #include <linux/trace_events.h> 17 #include <linux/compiler.h> 18 #include <linux/glob.h> 19 20 #ifdef CONFIG_FTRACE_SYSCALLS 21 #include <asm/unistd.h> /* For NR_SYSCALLS */ 22 #include <asm/syscall.h> /* some archs define it here */ 23 #endif 24 25 enum trace_type { 26 __TRACE_FIRST_TYPE = 0, 27 28 TRACE_FN, 29 TRACE_CTX, 30 TRACE_WAKE, 31 TRACE_STACK, 32 TRACE_PRINT, 33 TRACE_BPRINT, 34 TRACE_MMIO_RW, 35 TRACE_MMIO_MAP, 36 TRACE_BRANCH, 37 TRACE_GRAPH_RET, 38 TRACE_GRAPH_ENT, 39 TRACE_USER_STACK, 40 TRACE_BLK, 41 TRACE_BPUTS, 42 TRACE_HWLAT, 43 TRACE_RAW_DATA, 44 45 __TRACE_LAST_TYPE, 46 }; 47 48 49 #undef __field 50 #define __field(type, item) type item; 51 52 #undef __field_struct 53 #define __field_struct(type, item) __field(type, item) 54 55 #undef __field_desc 56 #define __field_desc(type, container, item) 57 58 #undef __array 59 #define __array(type, item, size) type item[size]; 60 61 #undef __array_desc 62 #define __array_desc(type, container, item, size) 63 64 #undef __dynamic_array 65 #define __dynamic_array(type, item) type item[]; 66 67 #undef F_STRUCT 68 #define F_STRUCT(args...) args 69 70 #undef FTRACE_ENTRY 71 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 72 struct struct_name { \ 73 struct trace_entry ent; \ 74 tstruct \ 75 } 76 77 #undef FTRACE_ENTRY_DUP 78 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) 79 80 #undef FTRACE_ENTRY_REG 81 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 82 filter, regfn) \ 83 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 84 filter) 85 86 #undef FTRACE_ENTRY_PACKED 87 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \ 88 filter) \ 89 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 90 filter) __packed 91 92 #include "trace_entries.h" 93 94 /* 95 * syscalls are special, and need special handling, this is why 96 * they are not included in trace_entries.h 97 */ 98 struct syscall_trace_enter { 99 struct trace_entry ent; 100 int nr; 101 unsigned long args[]; 102 }; 103 104 struct syscall_trace_exit { 105 struct trace_entry ent; 106 int nr; 107 long ret; 108 }; 109 110 struct kprobe_trace_entry_head { 111 struct trace_entry ent; 112 unsigned long ip; 113 }; 114 115 struct kretprobe_trace_entry_head { 116 struct trace_entry ent; 117 unsigned long func; 118 unsigned long ret_ip; 119 }; 120 121 /* 122 * trace_flag_type is an enumeration that holds different 123 * states when a trace occurs. These are: 124 * IRQS_OFF - interrupts were disabled 125 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 126 * NEED_RESCHED - reschedule is requested 127 * HARDIRQ - inside an interrupt handler 128 * SOFTIRQ - inside a softirq handler 129 */ 130 enum trace_flag_type { 131 TRACE_FLAG_IRQS_OFF = 0x01, 132 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 133 TRACE_FLAG_NEED_RESCHED = 0x04, 134 TRACE_FLAG_HARDIRQ = 0x08, 135 TRACE_FLAG_SOFTIRQ = 0x10, 136 TRACE_FLAG_PREEMPT_RESCHED = 0x20, 137 TRACE_FLAG_NMI = 0x40, 138 }; 139 140 #define TRACE_BUF_SIZE 1024 141 142 struct trace_array; 143 144 /* 145 * The CPU trace array - it consists of thousands of trace entries 146 * plus some other descriptor data: (for example which task started 147 * the trace, etc.) 148 */ 149 struct trace_array_cpu { 150 atomic_t disabled; 151 void *buffer_page; /* ring buffer spare */ 152 153 unsigned long entries; 154 unsigned long saved_latency; 155 unsigned long critical_start; 156 unsigned long critical_end; 157 unsigned long critical_sequence; 158 unsigned long nice; 159 unsigned long policy; 160 unsigned long rt_priority; 161 unsigned long skipped_entries; 162 u64 preempt_timestamp; 163 pid_t pid; 164 kuid_t uid; 165 char comm[TASK_COMM_LEN]; 166 167 bool ignore_pid; 168 #ifdef CONFIG_FUNCTION_TRACER 169 bool ftrace_ignore_pid; 170 #endif 171 }; 172 173 struct tracer; 174 struct trace_option_dentry; 175 176 struct trace_buffer { 177 struct trace_array *tr; 178 struct ring_buffer *buffer; 179 struct trace_array_cpu __percpu *data; 180 u64 time_start; 181 int cpu; 182 }; 183 184 #define TRACE_FLAGS_MAX_SIZE 32 185 186 struct trace_options { 187 struct tracer *tracer; 188 struct trace_option_dentry *topts; 189 }; 190 191 struct trace_pid_list { 192 int pid_max; 193 unsigned long *pids; 194 }; 195 196 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 197 198 /** 199 * struct cond_snapshot - conditional snapshot data and callback 200 * 201 * The cond_snapshot structure encapsulates a callback function and 202 * data associated with the snapshot for a given tracing instance. 203 * 204 * When a snapshot is taken conditionally, by invoking 205 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 206 * passed in turn to the cond_snapshot.update() function. That data 207 * can be compared by the update() implementation with the cond_data 208 * contained wihin the struct cond_snapshot instance associated with 209 * the trace_array. Because the tr->max_lock is held throughout the 210 * update() call, the update() function can directly retrieve the 211 * cond_snapshot and cond_data associated with the per-instance 212 * snapshot associated with the trace_array. 213 * 214 * The cond_snapshot.update() implementation can save data to be 215 * associated with the snapshot if it decides to, and returns 'true' 216 * in that case, or it returns 'false' if the conditional snapshot 217 * shouldn't be taken. 218 * 219 * The cond_snapshot instance is created and associated with the 220 * user-defined cond_data by tracing_cond_snapshot_enable(). 221 * Likewise, the cond_snapshot instance is destroyed and is no longer 222 * associated with the trace instance by 223 * tracing_cond_snapshot_disable(). 224 * 225 * The method below is required. 226 * 227 * @update: When a conditional snapshot is invoked, the update() 228 * callback function is invoked with the tr->max_lock held. The 229 * update() implementation signals whether or not to actually 230 * take the snapshot, by returning 'true' if so, 'false' if no 231 * snapshot should be taken. Because the max_lock is held for 232 * the duration of update(), the implementation is safe to 233 * directly retrieven and save any implementation data it needs 234 * to in association with the snapshot. 235 */ 236 struct cond_snapshot { 237 void *cond_data; 238 cond_update_fn_t update; 239 }; 240 241 /* 242 * The trace array - an array of per-CPU trace arrays. This is the 243 * highest level data structure that individual tracers deal with. 244 * They have on/off state as well: 245 */ 246 struct trace_array { 247 struct list_head list; 248 char *name; 249 struct trace_buffer trace_buffer; 250 #ifdef CONFIG_TRACER_MAX_TRACE 251 /* 252 * The max_buffer is used to snapshot the trace when a maximum 253 * latency is reached, or when the user initiates a snapshot. 254 * Some tracers will use this to store a maximum trace while 255 * it continues examining live traces. 256 * 257 * The buffers for the max_buffer are set up the same as the trace_buffer 258 * When a snapshot is taken, the buffer of the max_buffer is swapped 259 * with the buffer of the trace_buffer and the buffers are reset for 260 * the trace_buffer so the tracing can continue. 261 */ 262 struct trace_buffer max_buffer; 263 bool allocated_snapshot; 264 #endif 265 #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) 266 unsigned long max_latency; 267 #endif 268 struct trace_pid_list __rcu *filtered_pids; 269 /* 270 * max_lock is used to protect the swapping of buffers 271 * when taking a max snapshot. The buffers themselves are 272 * protected by per_cpu spinlocks. But the action of the swap 273 * needs its own lock. 274 * 275 * This is defined as a arch_spinlock_t in order to help 276 * with performance when lockdep debugging is enabled. 277 * 278 * It is also used in other places outside the update_max_tr 279 * so it needs to be defined outside of the 280 * CONFIG_TRACER_MAX_TRACE. 281 */ 282 arch_spinlock_t max_lock; 283 int buffer_disabled; 284 #ifdef CONFIG_FTRACE_SYSCALLS 285 int sys_refcount_enter; 286 int sys_refcount_exit; 287 struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; 288 struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; 289 #endif 290 int stop_count; 291 int clock_id; 292 int nr_topts; 293 bool clear_trace; 294 int buffer_percent; 295 unsigned int n_err_log_entries; 296 struct tracer *current_trace; 297 unsigned int trace_flags; 298 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 299 unsigned int flags; 300 raw_spinlock_t start_lock; 301 struct list_head err_log; 302 struct dentry *dir; 303 struct dentry *options; 304 struct dentry *percpu_dir; 305 struct dentry *event_dir; 306 struct trace_options *topts; 307 struct list_head systems; 308 struct list_head events; 309 struct trace_event_file *trace_marker_file; 310 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 311 int ref; 312 #ifdef CONFIG_FUNCTION_TRACER 313 struct ftrace_ops *ops; 314 struct trace_pid_list __rcu *function_pids; 315 #ifdef CONFIG_DYNAMIC_FTRACE 316 /* All of these are protected by the ftrace_lock */ 317 struct list_head func_probes; 318 struct list_head mod_trace; 319 struct list_head mod_notrace; 320 #endif 321 /* function tracing enabled */ 322 int function_enabled; 323 #endif 324 int time_stamp_abs_ref; 325 struct list_head hist_vars; 326 #ifdef CONFIG_TRACER_SNAPSHOT 327 struct cond_snapshot *cond_snapshot; 328 #endif 329 }; 330 331 enum { 332 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 333 }; 334 335 extern struct list_head ftrace_trace_arrays; 336 337 extern struct mutex trace_types_lock; 338 339 extern int trace_array_get(struct trace_array *tr); 340 extern void trace_array_put(struct trace_array *tr); 341 extern int tracing_check_open_get_tr(struct trace_array *tr); 342 343 extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs); 344 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 345 346 extern bool trace_clock_in_ns(struct trace_array *tr); 347 348 /* 349 * The global tracer (top) should be the first trace array added, 350 * but we check the flag anyway. 351 */ 352 static inline struct trace_array *top_trace_array(void) 353 { 354 struct trace_array *tr; 355 356 if (list_empty(&ftrace_trace_arrays)) 357 return NULL; 358 359 tr = list_entry(ftrace_trace_arrays.prev, 360 typeof(*tr), list); 361 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 362 return tr; 363 } 364 365 #define FTRACE_CMP_TYPE(var, type) \ 366 __builtin_types_compatible_p(typeof(var), type *) 367 368 #undef IF_ASSIGN 369 #define IF_ASSIGN(var, entry, etype, id) \ 370 if (FTRACE_CMP_TYPE(var, etype)) { \ 371 var = (typeof(var))(entry); \ 372 WARN_ON(id != 0 && (entry)->type != id); \ 373 break; \ 374 } 375 376 /* Will cause compile errors if type is not found. */ 377 extern void __ftrace_bad_type(void); 378 379 /* 380 * The trace_assign_type is a verifier that the entry type is 381 * the same as the type being assigned. To add new types simply 382 * add a line with the following format: 383 * 384 * IF_ASSIGN(var, ent, type, id); 385 * 386 * Where "type" is the trace type that includes the trace_entry 387 * as the "ent" item. And "id" is the trace identifier that is 388 * used in the trace_type enum. 389 * 390 * If the type can have more than one id, then use zero. 391 */ 392 #define trace_assign_type(var, ent) \ 393 do { \ 394 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 395 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 396 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 397 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 398 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 399 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 400 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 401 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 402 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 403 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 404 TRACE_MMIO_RW); \ 405 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 406 TRACE_MMIO_MAP); \ 407 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 408 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 409 TRACE_GRAPH_ENT); \ 410 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 411 TRACE_GRAPH_RET); \ 412 __ftrace_bad_type(); \ 413 } while (0) 414 415 /* 416 * An option specific to a tracer. This is a boolean value. 417 * The bit is the bit index that sets its value on the 418 * flags value in struct tracer_flags. 419 */ 420 struct tracer_opt { 421 const char *name; /* Will appear on the trace_options file */ 422 u32 bit; /* Mask assigned in val field in tracer_flags */ 423 }; 424 425 /* 426 * The set of specific options for a tracer. Your tracer 427 * have to set the initial value of the flags val. 428 */ 429 struct tracer_flags { 430 u32 val; 431 struct tracer_opt *opts; 432 struct tracer *trace; 433 }; 434 435 /* Makes more easy to define a tracer opt */ 436 #define TRACER_OPT(s, b) .name = #s, .bit = b 437 438 439 struct trace_option_dentry { 440 struct tracer_opt *opt; 441 struct tracer_flags *flags; 442 struct trace_array *tr; 443 struct dentry *entry; 444 }; 445 446 /** 447 * struct tracer - a specific tracer and its callbacks to interact with tracefs 448 * @name: the name chosen to select it on the available_tracers file 449 * @init: called when one switches to this tracer (echo name > current_tracer) 450 * @reset: called when one switches to another tracer 451 * @start: called when tracing is unpaused (echo 1 > tracing_on) 452 * @stop: called when tracing is paused (echo 0 > tracing_on) 453 * @update_thresh: called when tracing_thresh is updated 454 * @open: called when the trace file is opened 455 * @pipe_open: called when the trace_pipe file is opened 456 * @close: called when the trace file is released 457 * @pipe_close: called when the trace_pipe file is released 458 * @read: override the default read callback on trace_pipe 459 * @splice_read: override the default splice_read callback on trace_pipe 460 * @selftest: selftest to run on boot (see trace_selftest.c) 461 * @print_headers: override the first lines that describe your columns 462 * @print_line: callback that prints a trace 463 * @set_flag: signals one of your private flags changed (trace_options file) 464 * @flags: your private flags 465 */ 466 struct tracer { 467 const char *name; 468 int (*init)(struct trace_array *tr); 469 void (*reset)(struct trace_array *tr); 470 void (*start)(struct trace_array *tr); 471 void (*stop)(struct trace_array *tr); 472 int (*update_thresh)(struct trace_array *tr); 473 void (*open)(struct trace_iterator *iter); 474 void (*pipe_open)(struct trace_iterator *iter); 475 void (*close)(struct trace_iterator *iter); 476 void (*pipe_close)(struct trace_iterator *iter); 477 ssize_t (*read)(struct trace_iterator *iter, 478 struct file *filp, char __user *ubuf, 479 size_t cnt, loff_t *ppos); 480 ssize_t (*splice_read)(struct trace_iterator *iter, 481 struct file *filp, 482 loff_t *ppos, 483 struct pipe_inode_info *pipe, 484 size_t len, 485 unsigned int flags); 486 #ifdef CONFIG_FTRACE_STARTUP_TEST 487 int (*selftest)(struct tracer *trace, 488 struct trace_array *tr); 489 #endif 490 void (*print_header)(struct seq_file *m); 491 enum print_line_t (*print_line)(struct trace_iterator *iter); 492 /* If you handled the flag setting, return 0 */ 493 int (*set_flag)(struct trace_array *tr, 494 u32 old_flags, u32 bit, int set); 495 /* Return 0 if OK with change, else return non-zero */ 496 int (*flag_changed)(struct trace_array *tr, 497 u32 mask, int set); 498 struct tracer *next; 499 struct tracer_flags *flags; 500 int enabled; 501 int ref; 502 bool print_max; 503 bool allow_instances; 504 #ifdef CONFIG_TRACER_MAX_TRACE 505 bool use_max_tr; 506 #endif 507 /* True if tracer cannot be enabled in kernel param */ 508 bool noboot; 509 }; 510 511 512 /* Only current can touch trace_recursion */ 513 514 /* 515 * For function tracing recursion: 516 * The order of these bits are important. 517 * 518 * When function tracing occurs, the following steps are made: 519 * If arch does not support a ftrace feature: 520 * call internal function (uses INTERNAL bits) which calls... 521 * If callback is registered to the "global" list, the list 522 * function is called and recursion checks the GLOBAL bits. 523 * then this function calls... 524 * The function callback, which can use the FTRACE bits to 525 * check for recursion. 526 * 527 * Now if the arch does not suppport a feature, and it calls 528 * the global list function which calls the ftrace callback 529 * all three of these steps will do a recursion protection. 530 * There's no reason to do one if the previous caller already 531 * did. The recursion that we are protecting against will 532 * go through the same steps again. 533 * 534 * To prevent the multiple recursion checks, if a recursion 535 * bit is set that is higher than the MAX bit of the current 536 * check, then we know that the check was made by the previous 537 * caller, and we can skip the current check. 538 */ 539 enum { 540 TRACE_BUFFER_BIT, 541 TRACE_BUFFER_NMI_BIT, 542 TRACE_BUFFER_IRQ_BIT, 543 TRACE_BUFFER_SIRQ_BIT, 544 545 /* Start of function recursion bits */ 546 TRACE_FTRACE_BIT, 547 TRACE_FTRACE_NMI_BIT, 548 TRACE_FTRACE_IRQ_BIT, 549 TRACE_FTRACE_SIRQ_BIT, 550 551 /* INTERNAL_BITs must be greater than FTRACE_BITs */ 552 TRACE_INTERNAL_BIT, 553 TRACE_INTERNAL_NMI_BIT, 554 TRACE_INTERNAL_IRQ_BIT, 555 TRACE_INTERNAL_SIRQ_BIT, 556 557 TRACE_BRANCH_BIT, 558 /* 559 * Abuse of the trace_recursion. 560 * As we need a way to maintain state if we are tracing the function 561 * graph in irq because we want to trace a particular function that 562 * was called in irq context but we have irq tracing off. Since this 563 * can only be modified by current, we can reuse trace_recursion. 564 */ 565 TRACE_IRQ_BIT, 566 567 /* Set if the function is in the set_graph_function file */ 568 TRACE_GRAPH_BIT, 569 570 /* 571 * In the very unlikely case that an interrupt came in 572 * at a start of graph tracing, and we want to trace 573 * the function in that interrupt, the depth can be greater 574 * than zero, because of the preempted start of a previous 575 * trace. In an even more unlikely case, depth could be 2 576 * if a softirq interrupted the start of graph tracing, 577 * followed by an interrupt preempting a start of graph 578 * tracing in the softirq, and depth can even be 3 579 * if an NMI came in at the start of an interrupt function 580 * that preempted a softirq start of a function that 581 * preempted normal context!!!! Luckily, it can't be 582 * greater than 3, so the next two bits are a mask 583 * of what the depth is when we set TRACE_GRAPH_BIT 584 */ 585 586 TRACE_GRAPH_DEPTH_START_BIT, 587 TRACE_GRAPH_DEPTH_END_BIT, 588 589 /* 590 * To implement set_graph_notrace, if this bit is set, we ignore 591 * function graph tracing of called functions, until the return 592 * function is called to clear it. 593 */ 594 TRACE_GRAPH_NOTRACE_BIT, 595 }; 596 597 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 598 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 599 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 600 601 #define trace_recursion_depth() \ 602 (((current)->trace_recursion >> TRACE_GRAPH_DEPTH_START_BIT) & 3) 603 #define trace_recursion_set_depth(depth) \ 604 do { \ 605 current->trace_recursion &= \ 606 ~(3 << TRACE_GRAPH_DEPTH_START_BIT); \ 607 current->trace_recursion |= \ 608 ((depth) & 3) << TRACE_GRAPH_DEPTH_START_BIT; \ 609 } while (0) 610 611 #define TRACE_CONTEXT_BITS 4 612 613 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 614 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 615 616 #define TRACE_LIST_START TRACE_INTERNAL_BIT 617 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 618 619 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 620 621 static __always_inline int trace_get_context_bit(void) 622 { 623 int bit; 624 625 if (in_interrupt()) { 626 if (in_nmi()) 627 bit = 0; 628 629 else if (in_irq()) 630 bit = 1; 631 else 632 bit = 2; 633 } else 634 bit = 3; 635 636 return bit; 637 } 638 639 static __always_inline int trace_test_and_set_recursion(int start, int max) 640 { 641 unsigned int val = current->trace_recursion; 642 int bit; 643 644 /* A previous recursion check was made */ 645 if ((val & TRACE_CONTEXT_MASK) > max) 646 return 0; 647 648 bit = trace_get_context_bit() + start; 649 if (unlikely(val & (1 << bit))) 650 return -1; 651 652 val |= 1 << bit; 653 current->trace_recursion = val; 654 barrier(); 655 656 return bit; 657 } 658 659 static __always_inline void trace_clear_recursion(int bit) 660 { 661 unsigned int val = current->trace_recursion; 662 663 if (!bit) 664 return; 665 666 bit = 1 << bit; 667 val &= ~bit; 668 669 barrier(); 670 current->trace_recursion = val; 671 } 672 673 static inline struct ring_buffer_iter * 674 trace_buffer_iter(struct trace_iterator *iter, int cpu) 675 { 676 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 677 } 678 679 int tracer_init(struct tracer *t, struct trace_array *tr); 680 int tracing_is_enabled(void); 681 void tracing_reset_online_cpus(struct trace_buffer *buf); 682 void tracing_reset_current(int cpu); 683 void tracing_reset_all_online_cpus(void); 684 int tracing_open_generic(struct inode *inode, struct file *filp); 685 int tracing_open_generic_tr(struct inode *inode, struct file *filp); 686 bool tracing_is_disabled(void); 687 bool tracer_tracing_is_on(struct trace_array *tr); 688 void tracer_tracing_on(struct trace_array *tr); 689 void tracer_tracing_off(struct trace_array *tr); 690 struct dentry *trace_create_file(const char *name, 691 umode_t mode, 692 struct dentry *parent, 693 void *data, 694 const struct file_operations *fops); 695 696 struct dentry *tracing_init_dentry(void); 697 698 struct ring_buffer_event; 699 700 struct ring_buffer_event * 701 trace_buffer_lock_reserve(struct ring_buffer *buffer, 702 int type, 703 unsigned long len, 704 unsigned long flags, 705 int pc); 706 707 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 708 struct trace_array_cpu *data); 709 710 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 711 int *ent_cpu, u64 *ent_ts); 712 713 void trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer, 714 struct ring_buffer_event *event); 715 716 int trace_empty(struct trace_iterator *iter); 717 718 void *trace_find_next_entry_inc(struct trace_iterator *iter); 719 720 void trace_init_global_iter(struct trace_iterator *iter); 721 722 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 723 724 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 725 unsigned long trace_total_entries(struct trace_array *tr); 726 727 void trace_function(struct trace_array *tr, 728 unsigned long ip, 729 unsigned long parent_ip, 730 unsigned long flags, int pc); 731 void trace_graph_function(struct trace_array *tr, 732 unsigned long ip, 733 unsigned long parent_ip, 734 unsigned long flags, int pc); 735 void trace_latency_header(struct seq_file *m); 736 void trace_default_header(struct seq_file *m); 737 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 738 int trace_empty(struct trace_iterator *iter); 739 740 void trace_graph_return(struct ftrace_graph_ret *trace); 741 int trace_graph_entry(struct ftrace_graph_ent *trace); 742 void set_graph_array(struct trace_array *tr); 743 744 void tracing_start_cmdline_record(void); 745 void tracing_stop_cmdline_record(void); 746 void tracing_start_tgid_record(void); 747 void tracing_stop_tgid_record(void); 748 749 int register_tracer(struct tracer *type); 750 int is_tracing_stopped(void); 751 752 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 753 754 extern cpumask_var_t __read_mostly tracing_buffer_mask; 755 756 #define for_each_tracing_cpu(cpu) \ 757 for_each_cpu(cpu, tracing_buffer_mask) 758 759 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 760 761 extern unsigned long tracing_thresh; 762 763 /* PID filtering */ 764 765 extern int pid_max; 766 767 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 768 pid_t search_pid); 769 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 770 struct task_struct *task); 771 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 772 struct task_struct *self, 773 struct task_struct *task); 774 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 775 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 776 int trace_pid_show(struct seq_file *m, void *v); 777 void trace_free_pid_list(struct trace_pid_list *pid_list); 778 int trace_pid_write(struct trace_pid_list *filtered_pids, 779 struct trace_pid_list **new_pid_list, 780 const char __user *ubuf, size_t cnt); 781 782 #ifdef CONFIG_TRACER_MAX_TRACE 783 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 784 void *cond_data); 785 void update_max_tr_single(struct trace_array *tr, 786 struct task_struct *tsk, int cpu); 787 #endif /* CONFIG_TRACER_MAX_TRACE */ 788 789 #ifdef CONFIG_STACKTRACE 790 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 791 int pc); 792 #else 793 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 794 int skip, int pc) 795 { 796 } 797 #endif /* CONFIG_STACKTRACE */ 798 799 extern u64 ftrace_now(int cpu); 800 801 extern void trace_find_cmdline(int pid, char comm[]); 802 extern int trace_find_tgid(int pid); 803 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 804 805 #ifdef CONFIG_DYNAMIC_FTRACE 806 extern unsigned long ftrace_update_tot_cnt; 807 void ftrace_init_trace_array(struct trace_array *tr); 808 #else 809 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 810 #endif 811 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 812 extern int DYN_FTRACE_TEST_NAME(void); 813 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 814 extern int DYN_FTRACE_TEST_NAME2(void); 815 816 extern bool ring_buffer_expanded; 817 extern bool tracing_selftest_disabled; 818 819 #ifdef CONFIG_FTRACE_STARTUP_TEST 820 extern int trace_selftest_startup_function(struct tracer *trace, 821 struct trace_array *tr); 822 extern int trace_selftest_startup_function_graph(struct tracer *trace, 823 struct trace_array *tr); 824 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 825 struct trace_array *tr); 826 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 827 struct trace_array *tr); 828 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 829 struct trace_array *tr); 830 extern int trace_selftest_startup_wakeup(struct tracer *trace, 831 struct trace_array *tr); 832 extern int trace_selftest_startup_nop(struct tracer *trace, 833 struct trace_array *tr); 834 extern int trace_selftest_startup_branch(struct tracer *trace, 835 struct trace_array *tr); 836 /* 837 * Tracer data references selftest functions that only occur 838 * on boot up. These can be __init functions. Thus, when selftests 839 * are enabled, then the tracers need to reference __init functions. 840 */ 841 #define __tracer_data __refdata 842 #else 843 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 844 #define __tracer_data __read_mostly 845 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 846 847 extern void *head_page(struct trace_array_cpu *data); 848 extern unsigned long long ns2usecs(u64 nsec); 849 extern int 850 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 851 extern int 852 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 853 extern int 854 trace_array_vprintk(struct trace_array *tr, 855 unsigned long ip, const char *fmt, va_list args); 856 int trace_array_printk(struct trace_array *tr, 857 unsigned long ip, const char *fmt, ...); 858 int trace_array_printk_buf(struct ring_buffer *buffer, 859 unsigned long ip, const char *fmt, ...); 860 void trace_printk_seq(struct trace_seq *s); 861 enum print_line_t print_trace_line(struct trace_iterator *iter); 862 863 extern char trace_find_mark(unsigned long long duration); 864 865 struct ftrace_hash; 866 867 struct ftrace_mod_load { 868 struct list_head list; 869 char *func; 870 char *module; 871 int enable; 872 }; 873 874 enum { 875 FTRACE_HASH_FL_MOD = (1 << 0), 876 }; 877 878 struct ftrace_hash { 879 unsigned long size_bits; 880 struct hlist_head *buckets; 881 unsigned long count; 882 unsigned long flags; 883 struct rcu_head rcu; 884 }; 885 886 struct ftrace_func_entry * 887 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 888 889 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 890 { 891 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 892 } 893 894 /* Standard output formatting function used for function return traces */ 895 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 896 897 /* Flag options */ 898 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 899 #define TRACE_GRAPH_PRINT_CPU 0x2 900 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 901 #define TRACE_GRAPH_PRINT_PROC 0x8 902 #define TRACE_GRAPH_PRINT_DURATION 0x10 903 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 904 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 905 #define TRACE_GRAPH_PRINT_IRQS 0x80 906 #define TRACE_GRAPH_PRINT_TAIL 0x100 907 #define TRACE_GRAPH_SLEEP_TIME 0x200 908 #define TRACE_GRAPH_GRAPH_TIME 0x400 909 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 910 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 911 912 extern void ftrace_graph_sleep_time_control(bool enable); 913 914 #ifdef CONFIG_FUNCTION_PROFILER 915 extern void ftrace_graph_graph_time_control(bool enable); 916 #else 917 static inline void ftrace_graph_graph_time_control(bool enable) { } 918 #endif 919 920 extern enum print_line_t 921 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 922 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 923 extern void 924 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 925 extern void graph_trace_open(struct trace_iterator *iter); 926 extern void graph_trace_close(struct trace_iterator *iter); 927 extern int __trace_graph_entry(struct trace_array *tr, 928 struct ftrace_graph_ent *trace, 929 unsigned long flags, int pc); 930 extern void __trace_graph_return(struct trace_array *tr, 931 struct ftrace_graph_ret *trace, 932 unsigned long flags, int pc); 933 934 #ifdef CONFIG_DYNAMIC_FTRACE 935 extern struct ftrace_hash *ftrace_graph_hash; 936 extern struct ftrace_hash *ftrace_graph_notrace_hash; 937 938 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 939 { 940 unsigned long addr = trace->func; 941 int ret = 0; 942 943 preempt_disable_notrace(); 944 945 if (ftrace_hash_empty(ftrace_graph_hash)) { 946 ret = 1; 947 goto out; 948 } 949 950 if (ftrace_lookup_ip(ftrace_graph_hash, addr)) { 951 952 /* 953 * This needs to be cleared on the return functions 954 * when the depth is zero. 955 */ 956 trace_recursion_set(TRACE_GRAPH_BIT); 957 trace_recursion_set_depth(trace->depth); 958 959 /* 960 * If no irqs are to be traced, but a set_graph_function 961 * is set, and called by an interrupt handler, we still 962 * want to trace it. 963 */ 964 if (in_irq()) 965 trace_recursion_set(TRACE_IRQ_BIT); 966 else 967 trace_recursion_clear(TRACE_IRQ_BIT); 968 ret = 1; 969 } 970 971 out: 972 preempt_enable_notrace(); 973 return ret; 974 } 975 976 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 977 { 978 if (trace_recursion_test(TRACE_GRAPH_BIT) && 979 trace->depth == trace_recursion_depth()) 980 trace_recursion_clear(TRACE_GRAPH_BIT); 981 } 982 983 static inline int ftrace_graph_notrace_addr(unsigned long addr) 984 { 985 int ret = 0; 986 987 preempt_disable_notrace(); 988 989 if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr)) 990 ret = 1; 991 992 preempt_enable_notrace(); 993 return ret; 994 } 995 #else 996 static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) 997 { 998 return 1; 999 } 1000 1001 static inline int ftrace_graph_notrace_addr(unsigned long addr) 1002 { 1003 return 0; 1004 } 1005 static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) 1006 { } 1007 #endif /* CONFIG_DYNAMIC_FTRACE */ 1008 1009 extern unsigned int fgraph_max_depth; 1010 1011 static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) 1012 { 1013 /* trace it when it is-nested-in or is a function enabled. */ 1014 return !(trace_recursion_test(TRACE_GRAPH_BIT) || 1015 ftrace_graph_addr(trace)) || 1016 (trace->depth < 0) || 1017 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 1018 } 1019 1020 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 1021 static inline enum print_line_t 1022 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 1023 { 1024 return TRACE_TYPE_UNHANDLED; 1025 } 1026 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 1027 1028 extern struct list_head ftrace_pids; 1029 1030 #ifdef CONFIG_FUNCTION_TRACER 1031 struct ftrace_func_command { 1032 struct list_head list; 1033 char *name; 1034 int (*func)(struct trace_array *tr, 1035 struct ftrace_hash *hash, 1036 char *func, char *cmd, 1037 char *params, int enable); 1038 }; 1039 extern bool ftrace_filter_param __initdata; 1040 static inline int ftrace_trace_task(struct trace_array *tr) 1041 { 1042 return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid); 1043 } 1044 extern int ftrace_is_dead(void); 1045 int ftrace_create_function_files(struct trace_array *tr, 1046 struct dentry *parent); 1047 void ftrace_destroy_function_files(struct trace_array *tr); 1048 void ftrace_init_global_array_ops(struct trace_array *tr); 1049 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 1050 void ftrace_reset_array_ops(struct trace_array *tr); 1051 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 1052 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1053 struct dentry *d_tracer); 1054 void ftrace_clear_pids(struct trace_array *tr); 1055 int init_function_trace(void); 1056 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1057 #else 1058 static inline int ftrace_trace_task(struct trace_array *tr) 1059 { 1060 return 1; 1061 } 1062 static inline int ftrace_is_dead(void) { return 0; } 1063 static inline int 1064 ftrace_create_function_files(struct trace_array *tr, 1065 struct dentry *parent) 1066 { 1067 return 0; 1068 } 1069 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1070 static inline __init void 1071 ftrace_init_global_array_ops(struct trace_array *tr) { } 1072 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1073 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1074 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1075 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1076 static inline int init_function_trace(void) { return 0; } 1077 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1078 /* ftace_func_t type is not defined, use macro instead of static inline */ 1079 #define ftrace_init_array_ops(tr, func) do { } while (0) 1080 #endif /* CONFIG_FUNCTION_TRACER */ 1081 1082 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1083 1084 struct ftrace_probe_ops { 1085 void (*func)(unsigned long ip, 1086 unsigned long parent_ip, 1087 struct trace_array *tr, 1088 struct ftrace_probe_ops *ops, 1089 void *data); 1090 int (*init)(struct ftrace_probe_ops *ops, 1091 struct trace_array *tr, 1092 unsigned long ip, void *init_data, 1093 void **data); 1094 void (*free)(struct ftrace_probe_ops *ops, 1095 struct trace_array *tr, 1096 unsigned long ip, void *data); 1097 int (*print)(struct seq_file *m, 1098 unsigned long ip, 1099 struct ftrace_probe_ops *ops, 1100 void *data); 1101 }; 1102 1103 struct ftrace_func_mapper; 1104 typedef int (*ftrace_mapper_func)(void *data); 1105 1106 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1107 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1108 unsigned long ip); 1109 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1110 unsigned long ip, void *data); 1111 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1112 unsigned long ip); 1113 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1114 ftrace_mapper_func free_func); 1115 1116 extern int 1117 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1118 struct ftrace_probe_ops *ops, void *data); 1119 extern int 1120 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1121 struct ftrace_probe_ops *ops); 1122 extern void clear_ftrace_function_probes(struct trace_array *tr); 1123 1124 int register_ftrace_command(struct ftrace_func_command *cmd); 1125 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1126 1127 void ftrace_create_filter_files(struct ftrace_ops *ops, 1128 struct dentry *parent); 1129 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1130 #else 1131 struct ftrace_func_command; 1132 1133 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1134 { 1135 return -EINVAL; 1136 } 1137 static inline __init int unregister_ftrace_command(char *cmd_name) 1138 { 1139 return -EINVAL; 1140 } 1141 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1142 { 1143 } 1144 1145 /* 1146 * The ops parameter passed in is usually undefined. 1147 * This must be a macro. 1148 */ 1149 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1150 #define ftrace_destroy_filter_files(ops) do { } while (0) 1151 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1152 1153 bool ftrace_event_is_function(struct trace_event_call *call); 1154 1155 /* 1156 * struct trace_parser - servers for reading the user input separated by spaces 1157 * @cont: set if the input is not complete - no final space char was found 1158 * @buffer: holds the parsed user input 1159 * @idx: user input length 1160 * @size: buffer size 1161 */ 1162 struct trace_parser { 1163 bool cont; 1164 char *buffer; 1165 unsigned idx; 1166 unsigned size; 1167 }; 1168 1169 static inline bool trace_parser_loaded(struct trace_parser *parser) 1170 { 1171 return (parser->idx != 0); 1172 } 1173 1174 static inline bool trace_parser_cont(struct trace_parser *parser) 1175 { 1176 return parser->cont; 1177 } 1178 1179 static inline void trace_parser_clear(struct trace_parser *parser) 1180 { 1181 parser->cont = false; 1182 parser->idx = 0; 1183 } 1184 1185 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1186 extern void trace_parser_put(struct trace_parser *parser); 1187 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1188 size_t cnt, loff_t *ppos); 1189 1190 /* 1191 * Only create function graph options if function graph is configured. 1192 */ 1193 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1194 # define FGRAPH_FLAGS \ 1195 C(DISPLAY_GRAPH, "display-graph"), 1196 #else 1197 # define FGRAPH_FLAGS 1198 #endif 1199 1200 #ifdef CONFIG_BRANCH_TRACER 1201 # define BRANCH_FLAGS \ 1202 C(BRANCH, "branch"), 1203 #else 1204 # define BRANCH_FLAGS 1205 #endif 1206 1207 #ifdef CONFIG_FUNCTION_TRACER 1208 # define FUNCTION_FLAGS \ 1209 C(FUNCTION, "function-trace"), \ 1210 C(FUNC_FORK, "function-fork"), 1211 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION 1212 #else 1213 # define FUNCTION_FLAGS 1214 # define FUNCTION_DEFAULT_FLAGS 0UL 1215 # define TRACE_ITER_FUNC_FORK 0UL 1216 #endif 1217 1218 #ifdef CONFIG_STACKTRACE 1219 # define STACK_FLAGS \ 1220 C(STACKTRACE, "stacktrace"), 1221 #else 1222 # define STACK_FLAGS 1223 #endif 1224 1225 /* 1226 * trace_iterator_flags is an enumeration that defines bit 1227 * positions into trace_flags that controls the output. 1228 * 1229 * NOTE: These bits must match the trace_options array in 1230 * trace.c (this macro guarantees it). 1231 */ 1232 #define TRACE_FLAGS \ 1233 C(PRINT_PARENT, "print-parent"), \ 1234 C(SYM_OFFSET, "sym-offset"), \ 1235 C(SYM_ADDR, "sym-addr"), \ 1236 C(VERBOSE, "verbose"), \ 1237 C(RAW, "raw"), \ 1238 C(HEX, "hex"), \ 1239 C(BIN, "bin"), \ 1240 C(BLOCK, "block"), \ 1241 C(PRINTK, "trace_printk"), \ 1242 C(ANNOTATE, "annotate"), \ 1243 C(USERSTACKTRACE, "userstacktrace"), \ 1244 C(SYM_USEROBJ, "sym-userobj"), \ 1245 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1246 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1247 C(LATENCY_FMT, "latency-format"), \ 1248 C(RECORD_CMD, "record-cmd"), \ 1249 C(RECORD_TGID, "record-tgid"), \ 1250 C(OVERWRITE, "overwrite"), \ 1251 C(STOP_ON_FREE, "disable_on_free"), \ 1252 C(IRQ_INFO, "irq-info"), \ 1253 C(MARKERS, "markers"), \ 1254 C(EVENT_FORK, "event-fork"), \ 1255 FUNCTION_FLAGS \ 1256 FGRAPH_FLAGS \ 1257 STACK_FLAGS \ 1258 BRANCH_FLAGS 1259 1260 /* 1261 * By defining C, we can make TRACE_FLAGS a list of bit names 1262 * that will define the bits for the flag masks. 1263 */ 1264 #undef C 1265 #define C(a, b) TRACE_ITER_##a##_BIT 1266 1267 enum trace_iterator_bits { 1268 TRACE_FLAGS 1269 /* Make sure we don't go more than we have bits for */ 1270 TRACE_ITER_LAST_BIT 1271 }; 1272 1273 /* 1274 * By redefining C, we can make TRACE_FLAGS a list of masks that 1275 * use the bits as defined above. 1276 */ 1277 #undef C 1278 #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) 1279 1280 enum trace_iterator_flags { TRACE_FLAGS }; 1281 1282 /* 1283 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1284 * control the output of kernel symbols. 1285 */ 1286 #define TRACE_ITER_SYM_MASK \ 1287 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 1288 1289 extern struct tracer nop_trace; 1290 1291 #ifdef CONFIG_BRANCH_TRACER 1292 extern int enable_branch_tracing(struct trace_array *tr); 1293 extern void disable_branch_tracing(void); 1294 static inline int trace_branch_enable(struct trace_array *tr) 1295 { 1296 if (tr->trace_flags & TRACE_ITER_BRANCH) 1297 return enable_branch_tracing(tr); 1298 return 0; 1299 } 1300 static inline void trace_branch_disable(void) 1301 { 1302 /* due to races, always disable */ 1303 disable_branch_tracing(); 1304 } 1305 #else 1306 static inline int trace_branch_enable(struct trace_array *tr) 1307 { 1308 return 0; 1309 } 1310 static inline void trace_branch_disable(void) 1311 { 1312 } 1313 #endif /* CONFIG_BRANCH_TRACER */ 1314 1315 /* set ring buffers to default size if not already done so */ 1316 int tracing_update_buffers(void); 1317 1318 struct ftrace_event_field { 1319 struct list_head link; 1320 const char *name; 1321 const char *type; 1322 int filter_type; 1323 int offset; 1324 int size; 1325 int is_signed; 1326 }; 1327 1328 struct prog_entry; 1329 1330 struct event_filter { 1331 struct prog_entry __rcu *prog; 1332 char *filter_string; 1333 }; 1334 1335 struct event_subsystem { 1336 struct list_head list; 1337 const char *name; 1338 struct event_filter *filter; 1339 int ref_count; 1340 }; 1341 1342 struct trace_subsystem_dir { 1343 struct list_head list; 1344 struct event_subsystem *subsystem; 1345 struct trace_array *tr; 1346 struct dentry *entry; 1347 int ref_count; 1348 int nr_events; 1349 }; 1350 1351 extern int call_filter_check_discard(struct trace_event_call *call, void *rec, 1352 struct ring_buffer *buffer, 1353 struct ring_buffer_event *event); 1354 1355 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1356 struct ring_buffer *buffer, 1357 struct ring_buffer_event *event, 1358 unsigned long flags, int pc, 1359 struct pt_regs *regs); 1360 1361 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1362 struct ring_buffer *buffer, 1363 struct ring_buffer_event *event, 1364 unsigned long flags, int pc) 1365 { 1366 trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL); 1367 } 1368 1369 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1370 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1371 void trace_buffered_event_disable(void); 1372 void trace_buffered_event_enable(void); 1373 1374 static inline void 1375 __trace_event_discard_commit(struct ring_buffer *buffer, 1376 struct ring_buffer_event *event) 1377 { 1378 if (this_cpu_read(trace_buffered_event) == event) { 1379 /* Simply release the temp buffer */ 1380 this_cpu_dec(trace_buffered_event_cnt); 1381 return; 1382 } 1383 ring_buffer_discard_commit(buffer, event); 1384 } 1385 1386 /* 1387 * Helper function for event_trigger_unlock_commit{_regs}(). 1388 * If there are event triggers attached to this event that requires 1389 * filtering against its fields, then they wil be called as the 1390 * entry already holds the field information of the current event. 1391 * 1392 * It also checks if the event should be discarded or not. 1393 * It is to be discarded if the event is soft disabled and the 1394 * event was only recorded to process triggers, or if the event 1395 * filter is active and this event did not match the filters. 1396 * 1397 * Returns true if the event is discarded, false otherwise. 1398 */ 1399 static inline bool 1400 __event_trigger_test_discard(struct trace_event_file *file, 1401 struct ring_buffer *buffer, 1402 struct ring_buffer_event *event, 1403 void *entry, 1404 enum event_trigger_type *tt) 1405 { 1406 unsigned long eflags = file->flags; 1407 1408 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1409 *tt = event_triggers_call(file, entry, event); 1410 1411 if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || 1412 (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && 1413 !filter_match_preds(file->filter, entry))) { 1414 __trace_event_discard_commit(buffer, event); 1415 return true; 1416 } 1417 1418 return false; 1419 } 1420 1421 /** 1422 * event_trigger_unlock_commit - handle triggers and finish event commit 1423 * @file: The file pointer assoctiated to the event 1424 * @buffer: The ring buffer that the event is being written to 1425 * @event: The event meta data in the ring buffer 1426 * @entry: The event itself 1427 * @irq_flags: The state of the interrupts at the start of the event 1428 * @pc: The state of the preempt count at the start of the event. 1429 * 1430 * This is a helper function to handle triggers that require data 1431 * from the event itself. It also tests the event against filters and 1432 * if the event is soft disabled and should be discarded. 1433 */ 1434 static inline void 1435 event_trigger_unlock_commit(struct trace_event_file *file, 1436 struct ring_buffer *buffer, 1437 struct ring_buffer_event *event, 1438 void *entry, unsigned long irq_flags, int pc) 1439 { 1440 enum event_trigger_type tt = ETT_NONE; 1441 1442 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1443 trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc); 1444 1445 if (tt) 1446 event_triggers_post_call(file, tt); 1447 } 1448 1449 /** 1450 * event_trigger_unlock_commit_regs - handle triggers and finish event commit 1451 * @file: The file pointer assoctiated to the event 1452 * @buffer: The ring buffer that the event is being written to 1453 * @event: The event meta data in the ring buffer 1454 * @entry: The event itself 1455 * @irq_flags: The state of the interrupts at the start of the event 1456 * @pc: The state of the preempt count at the start of the event. 1457 * 1458 * This is a helper function to handle triggers that require data 1459 * from the event itself. It also tests the event against filters and 1460 * if the event is soft disabled and should be discarded. 1461 * 1462 * Same as event_trigger_unlock_commit() but calls 1463 * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). 1464 */ 1465 static inline void 1466 event_trigger_unlock_commit_regs(struct trace_event_file *file, 1467 struct ring_buffer *buffer, 1468 struct ring_buffer_event *event, 1469 void *entry, unsigned long irq_flags, int pc, 1470 struct pt_regs *regs) 1471 { 1472 enum event_trigger_type tt = ETT_NONE; 1473 1474 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1475 trace_buffer_unlock_commit_regs(file->tr, buffer, event, 1476 irq_flags, pc, regs); 1477 1478 if (tt) 1479 event_triggers_post_call(file, tt); 1480 } 1481 1482 #define FILTER_PRED_INVALID ((unsigned short)-1) 1483 #define FILTER_PRED_IS_RIGHT (1 << 15) 1484 #define FILTER_PRED_FOLD (1 << 15) 1485 1486 /* 1487 * The max preds is the size of unsigned short with 1488 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1489 * and FOLD flags. The other is reserved. 1490 * 1491 * 2^14 preds is way more than enough. 1492 */ 1493 #define MAX_FILTER_PRED 16384 1494 1495 struct filter_pred; 1496 struct regex; 1497 1498 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 1499 1500 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1501 1502 enum regex_type { 1503 MATCH_FULL = 0, 1504 MATCH_FRONT_ONLY, 1505 MATCH_MIDDLE_ONLY, 1506 MATCH_END_ONLY, 1507 MATCH_GLOB, 1508 MATCH_INDEX, 1509 }; 1510 1511 struct regex { 1512 char pattern[MAX_FILTER_STR_VAL]; 1513 int len; 1514 int field_len; 1515 regex_match_func match; 1516 }; 1517 1518 struct filter_pred { 1519 filter_pred_fn_t fn; 1520 u64 val; 1521 struct regex regex; 1522 unsigned short *ops; 1523 struct ftrace_event_field *field; 1524 int offset; 1525 int not; 1526 int op; 1527 }; 1528 1529 static inline bool is_string_field(struct ftrace_event_field *field) 1530 { 1531 return field->filter_type == FILTER_DYN_STRING || 1532 field->filter_type == FILTER_STATIC_STRING || 1533 field->filter_type == FILTER_PTR_STRING || 1534 field->filter_type == FILTER_COMM; 1535 } 1536 1537 static inline bool is_function_field(struct ftrace_event_field *field) 1538 { 1539 return field->filter_type == FILTER_TRACE_FN; 1540 } 1541 1542 extern enum regex_type 1543 filter_parse_regex(char *buff, int len, char **search, int *not); 1544 extern void print_event_filter(struct trace_event_file *file, 1545 struct trace_seq *s); 1546 extern int apply_event_filter(struct trace_event_file *file, 1547 char *filter_string); 1548 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1549 char *filter_string); 1550 extern void print_subsystem_event_filter(struct event_subsystem *system, 1551 struct trace_seq *s); 1552 extern int filter_assign_type(const char *type); 1553 extern int create_event_filter(struct trace_array *tr, 1554 struct trace_event_call *call, 1555 char *filter_str, bool set_str, 1556 struct event_filter **filterp); 1557 extern void free_event_filter(struct event_filter *filter); 1558 1559 struct ftrace_event_field * 1560 trace_find_event_field(struct trace_event_call *call, char *name); 1561 1562 extern void trace_event_enable_cmd_record(bool enable); 1563 extern void trace_event_enable_tgid_record(bool enable); 1564 1565 extern int event_trace_init(void); 1566 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1567 extern int event_trace_del_tracer(struct trace_array *tr); 1568 1569 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1570 const char *system, 1571 const char *event); 1572 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1573 const char *system, 1574 const char *event); 1575 1576 static inline void *event_file_data(struct file *filp) 1577 { 1578 return READ_ONCE(file_inode(filp)->i_private); 1579 } 1580 1581 extern struct mutex event_mutex; 1582 extern struct list_head ftrace_events; 1583 1584 extern const struct file_operations event_trigger_fops; 1585 extern const struct file_operations event_hist_fops; 1586 1587 #ifdef CONFIG_HIST_TRIGGERS 1588 extern int register_trigger_hist_cmd(void); 1589 extern int register_trigger_hist_enable_disable_cmds(void); 1590 #else 1591 static inline int register_trigger_hist_cmd(void) { return 0; } 1592 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1593 #endif 1594 1595 extern int register_trigger_cmds(void); 1596 extern void clear_event_triggers(struct trace_array *tr); 1597 1598 struct event_trigger_data { 1599 unsigned long count; 1600 int ref; 1601 struct event_trigger_ops *ops; 1602 struct event_command *cmd_ops; 1603 struct event_filter __rcu *filter; 1604 char *filter_str; 1605 void *private_data; 1606 bool paused; 1607 bool paused_tmp; 1608 struct list_head list; 1609 char *name; 1610 struct list_head named_list; 1611 struct event_trigger_data *named_data; 1612 }; 1613 1614 /* Avoid typos */ 1615 #define ENABLE_EVENT_STR "enable_event" 1616 #define DISABLE_EVENT_STR "disable_event" 1617 #define ENABLE_HIST_STR "enable_hist" 1618 #define DISABLE_HIST_STR "disable_hist" 1619 1620 struct enable_trigger_data { 1621 struct trace_event_file *file; 1622 bool enable; 1623 bool hist; 1624 }; 1625 1626 extern int event_enable_trigger_print(struct seq_file *m, 1627 struct event_trigger_ops *ops, 1628 struct event_trigger_data *data); 1629 extern void event_enable_trigger_free(struct event_trigger_ops *ops, 1630 struct event_trigger_data *data); 1631 extern int event_enable_trigger_func(struct event_command *cmd_ops, 1632 struct trace_event_file *file, 1633 char *glob, char *cmd, char *param); 1634 extern int event_enable_register_trigger(char *glob, 1635 struct event_trigger_ops *ops, 1636 struct event_trigger_data *data, 1637 struct trace_event_file *file); 1638 extern void event_enable_unregister_trigger(char *glob, 1639 struct event_trigger_ops *ops, 1640 struct event_trigger_data *test, 1641 struct trace_event_file *file); 1642 extern void trigger_data_free(struct event_trigger_data *data); 1643 extern int event_trigger_init(struct event_trigger_ops *ops, 1644 struct event_trigger_data *data); 1645 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1646 int trigger_enable); 1647 extern void update_cond_flag(struct trace_event_file *file); 1648 extern int set_trigger_filter(char *filter_str, 1649 struct event_trigger_data *trigger_data, 1650 struct trace_event_file *file); 1651 extern struct event_trigger_data *find_named_trigger(const char *name); 1652 extern bool is_named_trigger(struct event_trigger_data *test); 1653 extern int save_named_trigger(const char *name, 1654 struct event_trigger_data *data); 1655 extern void del_named_trigger(struct event_trigger_data *data); 1656 extern void pause_named_trigger(struct event_trigger_data *data); 1657 extern void unpause_named_trigger(struct event_trigger_data *data); 1658 extern void set_named_trigger_data(struct event_trigger_data *data, 1659 struct event_trigger_data *named_data); 1660 extern struct event_trigger_data * 1661 get_named_trigger_data(struct event_trigger_data *data); 1662 extern int register_event_command(struct event_command *cmd); 1663 extern int unregister_event_command(struct event_command *cmd); 1664 extern int register_trigger_hist_enable_disable_cmds(void); 1665 1666 /** 1667 * struct event_trigger_ops - callbacks for trace event triggers 1668 * 1669 * The methods in this structure provide per-event trigger hooks for 1670 * various trigger operations. 1671 * 1672 * All the methods below, except for @init() and @free(), must be 1673 * implemented. 1674 * 1675 * @func: The trigger 'probe' function called when the triggering 1676 * event occurs. The data passed into this callback is the data 1677 * that was supplied to the event_command @reg() function that 1678 * registered the trigger (see struct event_command) along with 1679 * the trace record, rec. 1680 * 1681 * @init: An optional initialization function called for the trigger 1682 * when the trigger is registered (via the event_command reg() 1683 * function). This can be used to perform per-trigger 1684 * initialization such as incrementing a per-trigger reference 1685 * count, for instance. This is usually implemented by the 1686 * generic utility function @event_trigger_init() (see 1687 * trace_event_triggers.c). 1688 * 1689 * @free: An optional de-initialization function called for the 1690 * trigger when the trigger is unregistered (via the 1691 * event_command @reg() function). This can be used to perform 1692 * per-trigger de-initialization such as decrementing a 1693 * per-trigger reference count and freeing corresponding trigger 1694 * data, for instance. This is usually implemented by the 1695 * generic utility function @event_trigger_free() (see 1696 * trace_event_triggers.c). 1697 * 1698 * @print: The callback function invoked to have the trigger print 1699 * itself. This is usually implemented by a wrapper function 1700 * that calls the generic utility function @event_trigger_print() 1701 * (see trace_event_triggers.c). 1702 */ 1703 struct event_trigger_ops { 1704 void (*func)(struct event_trigger_data *data, 1705 void *rec, 1706 struct ring_buffer_event *rbe); 1707 int (*init)(struct event_trigger_ops *ops, 1708 struct event_trigger_data *data); 1709 void (*free)(struct event_trigger_ops *ops, 1710 struct event_trigger_data *data); 1711 int (*print)(struct seq_file *m, 1712 struct event_trigger_ops *ops, 1713 struct event_trigger_data *data); 1714 }; 1715 1716 /** 1717 * struct event_command - callbacks and data members for event commands 1718 * 1719 * Event commands are invoked by users by writing the command name 1720 * into the 'trigger' file associated with a trace event. The 1721 * parameters associated with a specific invocation of an event 1722 * command are used to create an event trigger instance, which is 1723 * added to the list of trigger instances associated with that trace 1724 * event. When the event is hit, the set of triggers associated with 1725 * that event is invoked. 1726 * 1727 * The data members in this structure provide per-event command data 1728 * for various event commands. 1729 * 1730 * All the data members below, except for @post_trigger, must be set 1731 * for each event command. 1732 * 1733 * @name: The unique name that identifies the event command. This is 1734 * the name used when setting triggers via trigger files. 1735 * 1736 * @trigger_type: A unique id that identifies the event command 1737 * 'type'. This value has two purposes, the first to ensure that 1738 * only one trigger of the same type can be set at a given time 1739 * for a particular event e.g. it doesn't make sense to have both 1740 * a traceon and traceoff trigger attached to a single event at 1741 * the same time, so traceon and traceoff have the same type 1742 * though they have different names. The @trigger_type value is 1743 * also used as a bit value for deferring the actual trigger 1744 * action until after the current event is finished. Some 1745 * commands need to do this if they themselves log to the trace 1746 * buffer (see the @post_trigger() member below). @trigger_type 1747 * values are defined by adding new values to the trigger_type 1748 * enum in include/linux/trace_events.h. 1749 * 1750 * @flags: See the enum event_command_flags below. 1751 * 1752 * All the methods below, except for @set_filter() and @unreg_all(), 1753 * must be implemented. 1754 * 1755 * @func: The callback function responsible for parsing and 1756 * registering the trigger written to the 'trigger' file by the 1757 * user. It allocates the trigger instance and registers it with 1758 * the appropriate trace event. It makes use of the other 1759 * event_command callback functions to orchestrate this, and is 1760 * usually implemented by the generic utility function 1761 * @event_trigger_callback() (see trace_event_triggers.c). 1762 * 1763 * @reg: Adds the trigger to the list of triggers associated with the 1764 * event, and enables the event trigger itself, after 1765 * initializing it (via the event_trigger_ops @init() function). 1766 * This is also where commands can use the @trigger_type value to 1767 * make the decision as to whether or not multiple instances of 1768 * the trigger should be allowed. This is usually implemented by 1769 * the generic utility function @register_trigger() (see 1770 * trace_event_triggers.c). 1771 * 1772 * @unreg: Removes the trigger from the list of triggers associated 1773 * with the event, and disables the event trigger itself, after 1774 * initializing it (via the event_trigger_ops @free() function). 1775 * This is usually implemented by the generic utility function 1776 * @unregister_trigger() (see trace_event_triggers.c). 1777 * 1778 * @unreg_all: An optional function called to remove all the triggers 1779 * from the list of triggers associated with the event. Called 1780 * when a trigger file is opened in truncate mode. 1781 * 1782 * @set_filter: An optional function called to parse and set a filter 1783 * for the trigger. If no @set_filter() method is set for the 1784 * event command, filters set by the user for the command will be 1785 * ignored. This is usually implemented by the generic utility 1786 * function @set_trigger_filter() (see trace_event_triggers.c). 1787 * 1788 * @get_trigger_ops: The callback function invoked to retrieve the 1789 * event_trigger_ops implementation associated with the command. 1790 */ 1791 struct event_command { 1792 struct list_head list; 1793 char *name; 1794 enum event_trigger_type trigger_type; 1795 int flags; 1796 int (*func)(struct event_command *cmd_ops, 1797 struct trace_event_file *file, 1798 char *glob, char *cmd, char *params); 1799 int (*reg)(char *glob, 1800 struct event_trigger_ops *ops, 1801 struct event_trigger_data *data, 1802 struct trace_event_file *file); 1803 void (*unreg)(char *glob, 1804 struct event_trigger_ops *ops, 1805 struct event_trigger_data *data, 1806 struct trace_event_file *file); 1807 void (*unreg_all)(struct trace_event_file *file); 1808 int (*set_filter)(char *filter_str, 1809 struct event_trigger_data *data, 1810 struct trace_event_file *file); 1811 struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); 1812 }; 1813 1814 /** 1815 * enum event_command_flags - flags for struct event_command 1816 * 1817 * @POST_TRIGGER: A flag that says whether or not this command needs 1818 * to have its action delayed until after the current event has 1819 * been closed. Some triggers need to avoid being invoked while 1820 * an event is currently in the process of being logged, since 1821 * the trigger may itself log data into the trace buffer. Thus 1822 * we make sure the current event is committed before invoking 1823 * those triggers. To do that, the trigger invocation is split 1824 * in two - the first part checks the filter using the current 1825 * trace record; if a command has the @post_trigger flag set, it 1826 * sets a bit for itself in the return value, otherwise it 1827 * directly invokes the trigger. Once all commands have been 1828 * either invoked or set their return flag, the current record is 1829 * either committed or discarded. At that point, if any commands 1830 * have deferred their triggers, those commands are finally 1831 * invoked following the close of the current event. In other 1832 * words, if the event_trigger_ops @func() probe implementation 1833 * itself logs to the trace buffer, this flag should be set, 1834 * otherwise it can be left unspecified. 1835 * 1836 * @NEEDS_REC: A flag that says whether or not this command needs 1837 * access to the trace record in order to perform its function, 1838 * regardless of whether or not it has a filter associated with 1839 * it (filters make a trigger require access to the trace record 1840 * but are not always present). 1841 */ 1842 enum event_command_flags { 1843 EVENT_CMD_FL_POST_TRIGGER = 1, 1844 EVENT_CMD_FL_NEEDS_REC = 2, 1845 }; 1846 1847 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 1848 { 1849 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 1850 } 1851 1852 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 1853 { 1854 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 1855 } 1856 1857 extern int trace_event_enable_disable(struct trace_event_file *file, 1858 int enable, int soft_disable); 1859 extern int tracing_alloc_snapshot(void); 1860 extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 1861 extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 1862 1863 extern int tracing_snapshot_cond_disable(struct trace_array *tr); 1864 extern void *tracing_cond_snapshot_data(struct trace_array *tr); 1865 1866 extern const char *__start___trace_bprintk_fmt[]; 1867 extern const char *__stop___trace_bprintk_fmt[]; 1868 1869 extern const char *__start___tracepoint_str[]; 1870 extern const char *__stop___tracepoint_str[]; 1871 1872 void trace_printk_control(bool enabled); 1873 void trace_printk_init_buffers(void); 1874 void trace_printk_start_comm(void); 1875 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1876 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1877 1878 #define MAX_EVENT_NAME_LEN 64 1879 1880 extern int trace_run_command(const char *buf, int (*createfn)(int, char**)); 1881 extern ssize_t trace_parse_run_command(struct file *file, 1882 const char __user *buffer, size_t count, loff_t *ppos, 1883 int (*createfn)(int, char**)); 1884 1885 extern unsigned int err_pos(char *cmd, const char *str); 1886 extern void tracing_log_err(struct trace_array *tr, 1887 const char *loc, const char *cmd, 1888 const char **errs, u8 type, u8 pos); 1889 1890 /* 1891 * Normal trace_printk() and friends allocates special buffers 1892 * to do the manipulation, as well as saves the print formats 1893 * into sections to display. But the trace infrastructure wants 1894 * to use these without the added overhead at the price of being 1895 * a bit slower (used mainly for warnings, where we don't care 1896 * about performance). The internal_trace_puts() is for such 1897 * a purpose. 1898 */ 1899 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1900 1901 #undef FTRACE_ENTRY 1902 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1903 extern struct trace_event_call \ 1904 __aligned(4) event_##call; 1905 #undef FTRACE_ENTRY_DUP 1906 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1907 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1908 filter) 1909 #undef FTRACE_ENTRY_PACKED 1910 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \ 1911 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1912 filter) 1913 1914 #include "trace_entries.h" 1915 1916 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1917 int perf_ftrace_event_register(struct trace_event_call *call, 1918 enum trace_reg type, void *data); 1919 #else 1920 #define perf_ftrace_event_register NULL 1921 #endif 1922 1923 #ifdef CONFIG_FTRACE_SYSCALLS 1924 void init_ftrace_syscalls(void); 1925 const char *get_syscall_name(int syscall); 1926 #else 1927 static inline void init_ftrace_syscalls(void) { } 1928 static inline const char *get_syscall_name(int syscall) 1929 { 1930 return NULL; 1931 } 1932 #endif 1933 1934 #ifdef CONFIG_EVENT_TRACING 1935 void trace_event_init(void); 1936 void trace_event_eval_update(struct trace_eval_map **map, int len); 1937 #else 1938 static inline void __init trace_event_init(void) { } 1939 static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } 1940 #endif 1941 1942 #ifdef CONFIG_TRACER_SNAPSHOT 1943 void tracing_snapshot_instance(struct trace_array *tr); 1944 int tracing_alloc_snapshot_instance(struct trace_array *tr); 1945 #else 1946 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 1947 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 1948 { 1949 return 0; 1950 } 1951 #endif 1952 1953 #ifdef CONFIG_PREEMPT_TRACER 1954 void tracer_preempt_on(unsigned long a0, unsigned long a1); 1955 void tracer_preempt_off(unsigned long a0, unsigned long a1); 1956 #else 1957 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 1958 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 1959 #endif 1960 #ifdef CONFIG_IRQSOFF_TRACER 1961 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 1962 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 1963 #else 1964 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 1965 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 1966 #endif 1967 1968 extern struct trace_iterator *tracepoint_print_iter; 1969 1970 /* 1971 * Reset the state of the trace_iterator so that it can read consumed data. 1972 * Normally, the trace_iterator is used for reading the data when it is not 1973 * consumed, and must retain state. 1974 */ 1975 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 1976 { 1977 const size_t offset = offsetof(struct trace_iterator, seq); 1978 1979 /* 1980 * Keep gcc from complaining about overwriting more than just one 1981 * member in the structure. 1982 */ 1983 memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset); 1984 1985 iter->pos = -1; 1986 } 1987 1988 #endif /* _LINUX_KERNEL_TRACE_H */ 1989