1 // SPDX-License-Identifier: GPL-2.0 2 3 #ifndef _LINUX_KERNEL_TRACE_H 4 #define _LINUX_KERNEL_TRACE_H 5 6 #include <linux/fs.h> 7 #include <linux/atomic.h> 8 #include <linux/sched.h> 9 #include <linux/clocksource.h> 10 #include <linux/ring_buffer.h> 11 #include <linux/mmiotrace.h> 12 #include <linux/tracepoint.h> 13 #include <linux/ftrace.h> 14 #include <linux/trace.h> 15 #include <linux/hw_breakpoint.h> 16 #include <linux/trace_seq.h> 17 #include <linux/trace_events.h> 18 #include <linux/compiler.h> 19 #include <linux/glob.h> 20 #include <linux/irq_work.h> 21 #include <linux/workqueue.h> 22 #include <linux/ctype.h> 23 #include <linux/once_lite.h> 24 #include <linux/ftrace_regs.h> 25 #include <linux/llist.h> 26 27 #include "pid_list.h" 28 29 #ifdef CONFIG_FTRACE_SYSCALLS 30 #include <asm/unistd.h> /* For NR_syscalls */ 31 #include <asm/syscall.h> /* some archs define it here */ 32 #endif 33 34 #define TRACE_MODE_WRITE 0640 35 #define TRACE_MODE_READ 0440 36 37 enum trace_type { 38 __TRACE_FIRST_TYPE = 0, 39 40 TRACE_FN, 41 TRACE_CTX, 42 TRACE_WAKE, 43 TRACE_STACK, 44 TRACE_PRINT, 45 TRACE_BPRINT, 46 TRACE_MMIO_RW, 47 TRACE_MMIO_MAP, 48 TRACE_BRANCH, 49 TRACE_GRAPH_RET, 50 TRACE_GRAPH_ENT, 51 TRACE_GRAPH_RETADDR_ENT, 52 TRACE_USER_STACK, 53 TRACE_BLK, 54 TRACE_BPUTS, 55 TRACE_HWLAT, 56 TRACE_OSNOISE, 57 TRACE_TIMERLAT, 58 TRACE_RAW_DATA, 59 TRACE_FUNC_REPEATS, 60 61 __TRACE_LAST_TYPE, 62 }; 63 64 65 #undef __field 66 #define __field(type, item) type item; 67 68 #undef __field_fn 69 #define __field_fn(type, item) type item; 70 71 #undef __field_packed 72 #define __field_packed(type, item) type item; 73 74 #undef __field_struct 75 #define __field_struct(type, item) __field(type, item) 76 77 #undef __field_desc 78 #define __field_desc(type, container, item) 79 80 #undef __field_desc_packed 81 #define __field_desc_packed(type, container, item) 82 83 #undef __array 84 #define __array(type, item, size) type item[size]; 85 86 /* 87 * For backward compatibility, older user space expects to see the 88 * kernel_stack event with a fixed size caller field. But today the fix 89 * size is ignored by the kernel, and the real structure is dynamic. 90 * Expose to user space: "unsigned long caller[8];" but the real structure 91 * will be "unsigned long caller[] __counted_by(size)" 92 */ 93 #undef __stack_array 94 #define __stack_array(type, item, size, field) type item[] __counted_by(field); 95 96 #undef __array_desc 97 #define __array_desc(type, container, item, size) 98 99 #undef __dynamic_array 100 #define __dynamic_array(type, item) type item[]; 101 102 #undef __rel_dynamic_array 103 #define __rel_dynamic_array(type, item) type item[]; 104 105 #undef F_STRUCT 106 #define F_STRUCT(args...) args 107 108 #undef FTRACE_ENTRY 109 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ 110 struct struct_name { \ 111 struct trace_entry ent; \ 112 tstruct \ 113 } 114 115 #undef FTRACE_ENTRY_DUP 116 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) 117 118 #undef FTRACE_ENTRY_REG 119 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ 120 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) 121 122 #undef FTRACE_ENTRY_PACKED 123 #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ 124 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed 125 126 #include "trace_entries.h" 127 128 /* Use this for memory failure errors */ 129 #define MEM_FAIL(condition, fmt, ...) \ 130 DO_ONCE_LITE_IF(condition, pr_err, "ERROR: " fmt, ##__VA_ARGS__) 131 132 #define FAULT_STRING "(fault)" 133 134 #define HIST_STACKTRACE_DEPTH 31 135 #define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long)) 136 #define HIST_STACKTRACE_SKIP 5 137 138 #define SYSCALL_FAULT_USER_MAX 165 139 140 /* 141 * syscalls are special, and need special handling, this is why 142 * they are not included in trace_entries.h 143 */ 144 struct syscall_trace_enter { 145 struct trace_entry ent; 146 int nr; 147 unsigned long args[]; 148 }; 149 150 struct syscall_trace_exit { 151 struct trace_entry ent; 152 int nr; 153 long ret; 154 }; 155 156 struct kprobe_trace_entry_head { 157 struct trace_entry ent; 158 unsigned long ip; 159 }; 160 161 struct eprobe_trace_entry_head { 162 struct trace_entry ent; 163 }; 164 165 struct kretprobe_trace_entry_head { 166 struct trace_entry ent; 167 unsigned long func; 168 unsigned long ret_ip; 169 }; 170 171 struct fentry_trace_entry_head { 172 struct trace_entry ent; 173 unsigned long ip; 174 }; 175 176 struct fexit_trace_entry_head { 177 struct trace_entry ent; 178 unsigned long func; 179 unsigned long ret_ip; 180 }; 181 182 #define TRACE_BUF_SIZE 1024 183 184 struct trace_array; 185 186 /* 187 * The CPU trace array - it consists of thousands of trace entries 188 * plus some other descriptor data: (for example which task started 189 * the trace, etc.) 190 */ 191 struct trace_array_cpu { 192 local_t disabled; 193 194 unsigned long entries; 195 unsigned long saved_latency; 196 unsigned long critical_start; 197 unsigned long critical_end; 198 unsigned long critical_sequence; 199 unsigned long nice; 200 unsigned long policy; 201 unsigned long rt_priority; 202 unsigned long skipped_entries; 203 u64 preempt_timestamp; 204 pid_t pid; 205 kuid_t uid; 206 char comm[TASK_COMM_LEN]; 207 208 #ifdef CONFIG_FUNCTION_TRACER 209 int ftrace_ignore_pid; 210 #endif 211 bool ignore_pid; 212 }; 213 214 struct tracer; 215 struct trace_option_dentry; 216 217 struct array_buffer { 218 struct trace_array *tr; 219 struct trace_buffer *buffer; 220 struct trace_array_cpu __percpu *data; 221 u64 time_start; 222 int cpu; 223 }; 224 225 #define TRACE_FLAGS_MAX_SIZE 64 226 227 struct trace_options { 228 struct tracer *tracer; 229 struct trace_option_dentry *topts; 230 }; 231 232 struct trace_pid_list *trace_pid_list_alloc(void); 233 void trace_pid_list_free(struct trace_pid_list *pid_list); 234 bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid); 235 int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid); 236 int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid); 237 int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid); 238 int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid, 239 unsigned int *next); 240 241 enum { 242 TRACE_PIDS = BIT(0), 243 TRACE_NO_PIDS = BIT(1), 244 }; 245 246 static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, 247 struct trace_pid_list *no_pid_list) 248 { 249 /* Return true if the pid list in type has pids */ 250 return ((type & TRACE_PIDS) && pid_list) || 251 ((type & TRACE_NO_PIDS) && no_pid_list); 252 } 253 254 static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, 255 struct trace_pid_list *no_pid_list) 256 { 257 /* 258 * Turning off what is in @type, return true if the "other" 259 * pid list, still has pids in it. 260 */ 261 return (!(type & TRACE_PIDS) && pid_list) || 262 (!(type & TRACE_NO_PIDS) && no_pid_list); 263 } 264 265 typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); 266 267 #ifdef CONFIG_TRACER_SNAPSHOT 268 /** 269 * struct cond_snapshot - conditional snapshot data and callback 270 * 271 * The cond_snapshot structure encapsulates a callback function and 272 * data associated with the snapshot for a given tracing instance. 273 * 274 * When a snapshot is taken conditionally, by invoking 275 * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is 276 * passed in turn to the cond_snapshot.update() function. That data 277 * can be compared by the update() implementation with the cond_data 278 * contained within the struct cond_snapshot instance associated with 279 * the trace_array. Because the tr->max_lock is held throughout the 280 * update() call, the update() function can directly retrieve the 281 * cond_snapshot and cond_data associated with the per-instance 282 * snapshot associated with the trace_array. 283 * 284 * The cond_snapshot.update() implementation can save data to be 285 * associated with the snapshot if it decides to, and returns 'true' 286 * in that case, or it returns 'false' if the conditional snapshot 287 * shouldn't be taken. 288 * 289 * The cond_snapshot instance is created and associated with the 290 * user-defined cond_data by tracing_cond_snapshot_enable(). 291 * Likewise, the cond_snapshot instance is destroyed and is no longer 292 * associated with the trace instance by 293 * tracing_cond_snapshot_disable(). 294 * 295 * The method below is required. 296 * 297 * @update: When a conditional snapshot is invoked, the update() 298 * callback function is invoked with the tr->max_lock held. The 299 * update() implementation signals whether or not to actually 300 * take the snapshot, by returning 'true' if so, 'false' if no 301 * snapshot should be taken. Because the max_lock is held for 302 * the duration of update(), the implementation is safe to 303 * directly retrieved and save any implementation data it needs 304 * to in association with the snapshot. 305 */ 306 struct cond_snapshot { 307 void *cond_data; 308 cond_update_fn_t update; 309 }; 310 #endif /* CONFIG_TRACER_SNAPSHOT */ 311 312 /* 313 * struct trace_func_repeats - used to keep track of the consecutive 314 * (on the same CPU) calls of a single function. 315 */ 316 struct trace_func_repeats { 317 unsigned long ip; 318 unsigned long parent_ip; 319 unsigned long count; 320 u64 ts_last_call; 321 }; 322 323 struct trace_module_delta { 324 struct rcu_head rcu; 325 long delta[]; 326 }; 327 328 /* 329 * The trace array - an array of per-CPU trace arrays. This is the 330 * highest level data structure that individual tracers deal with. 331 * They have on/off state as well: 332 */ 333 struct trace_array { 334 struct list_head list; 335 char *name; 336 struct array_buffer array_buffer; 337 #ifdef CONFIG_TRACER_SNAPSHOT 338 /* 339 * The snapshot_buffer is used to snapshot the trace when a maximum 340 * latency is reached, or when the user initiates a snapshot. 341 * Some tracers will use this to store a maximum trace while 342 * it continues examining live traces. 343 * 344 * The buffers for the snapshot_buffer are set up the same as the 345 * array_buffer. When a snapshot is taken, the buffer of the 346 * snapshot_buffer is swapped with the buffer of the array_buffer 347 * and the buffers are reset for the array_buffer so the tracing can 348 * continue. 349 */ 350 struct array_buffer snapshot_buffer; 351 bool allocated_snapshot; 352 spinlock_t snapshot_trigger_lock; 353 unsigned int snapshot; 354 #ifdef CONFIG_TRACER_MAX_TRACE 355 unsigned long max_latency; 356 struct dentry *d_max_latency; 357 #ifdef CONFIG_FSNOTIFY 358 struct work_struct fsnotify_work; 359 struct irq_work fsnotify_irqwork; 360 #endif /* CONFIG_FSNOTIFY */ 361 #endif /* CONFIG_TRACER_MAX_TRACE */ 362 #endif /* CONFIG_TRACER_SNAPSHOT */ 363 364 /* The below is for memory mapped ring buffer */ 365 unsigned int mapped; 366 unsigned long range_addr_start; 367 unsigned long range_addr_size; 368 char *range_name; 369 long text_delta; 370 struct trace_module_delta *module_delta; 371 void *scratch; /* pointer in persistent memory */ 372 int scratch_size; 373 374 int buffer_disabled; 375 376 struct trace_pid_list __rcu *filtered_pids; 377 struct trace_pid_list __rcu *filtered_no_pids; 378 /* 379 * max_lock is used to protect the swapping of buffers 380 * when taking a max snapshot. The buffers themselves are 381 * protected by per_cpu spinlocks. But the action of the swap 382 * needs its own lock. 383 * 384 * This is defined as a arch_spinlock_t in order to help 385 * with performance when lockdep debugging is enabled. 386 * 387 * It is also used in other places outside the update_max_tr 388 * so it needs to be defined outside of the 389 * CONFIG_TRACER_SNAPSHOT. 390 */ 391 arch_spinlock_t max_lock; 392 #ifdef CONFIG_FTRACE_SYSCALLS 393 int sys_refcount_enter; 394 int sys_refcount_exit; 395 struct trace_event_file *enter_syscall_files[NR_syscalls]; 396 struct trace_event_file *exit_syscall_files[NR_syscalls]; 397 #endif 398 int stop_count; 399 int clock_id; 400 int nr_topts; 401 bool clear_trace; 402 int buffer_percent; 403 unsigned int n_err_log_entries; 404 struct tracer *current_trace; 405 struct tracer_flags *current_trace_flags; 406 u64 trace_flags; 407 unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; 408 unsigned int flags; 409 raw_spinlock_t start_lock; 410 union { 411 const char *system_names; 412 char *boot_events; 413 }; 414 struct list_head err_log; 415 struct dentry *dir; 416 struct dentry *options; 417 struct dentry *percpu_dir; 418 struct eventfs_inode *event_dir; 419 struct trace_options *topts; 420 struct list_head systems; 421 struct list_head events; 422 struct list_head marker_list; 423 struct list_head tracers; 424 struct trace_event_file *trace_marker_file; 425 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 426 /* one per_cpu trace_pipe can be opened by only one user */ 427 cpumask_var_t pipe_cpumask; 428 int ref; 429 int trace_ref; 430 #ifdef CONFIG_MODULES 431 struct list_head mod_events; 432 #endif 433 #ifdef CONFIG_FUNCTION_TRACER 434 struct ftrace_ops *ops; 435 struct trace_pid_list __rcu *function_pids; 436 struct trace_pid_list __rcu *function_no_pids; 437 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 438 struct fgraph_ops *gops; 439 #endif 440 #ifdef CONFIG_DYNAMIC_FTRACE 441 /* All of these are protected by the ftrace_lock */ 442 struct list_head func_probes; 443 struct list_head mod_trace; 444 struct list_head mod_notrace; 445 #endif 446 /* function tracing enabled */ 447 int function_enabled; 448 #endif 449 int no_filter_buffering_ref; 450 unsigned int syscall_buf_sz; 451 struct list_head hist_vars; 452 #ifdef CONFIG_TRACER_SNAPSHOT 453 struct cond_snapshot *cond_snapshot; 454 #endif 455 struct trace_func_repeats __percpu *last_func_repeats; 456 /* 457 * On boot up, the ring buffer is set to the minimum size, so that 458 * we do not waste memory on systems that are not using tracing. 459 */ 460 bool ring_buffer_expanded; 461 /* 462 * If the ring buffer is a read only backup instance, it will be 463 * removed after dumping all data via pipe, because no readable data. 464 */ 465 bool free_on_close; 466 struct work_struct autoremove_work; 467 }; 468 469 enum { 470 TRACE_ARRAY_FL_GLOBAL = BIT(0), 471 TRACE_ARRAY_FL_BOOT = BIT(1), 472 TRACE_ARRAY_FL_LAST_BOOT = BIT(2), 473 TRACE_ARRAY_FL_MOD_INIT = BIT(3), 474 TRACE_ARRAY_FL_MEMMAP = BIT(4), 475 TRACE_ARRAY_FL_VMALLOC = BIT(5), 476 TRACE_ARRAY_FL_RDONLY = BIT(6), 477 }; 478 479 #ifdef CONFIG_MODULES 480 bool module_exists(const char *module); 481 #else 482 static inline bool module_exists(const char *module) 483 { 484 return false; 485 } 486 #endif 487 488 extern struct list_head ftrace_trace_arrays; 489 490 extern struct mutex trace_types_lock; 491 492 extern int trace_array_get(struct trace_array *tr); 493 extern int tracing_check_open_get_tr(struct trace_array *tr); 494 extern struct trace_array *trace_array_find(const char *instance); 495 extern struct trace_array *trace_array_find_get(const char *instance); 496 497 extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe); 498 extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); 499 500 extern bool trace_clock_in_ns(struct trace_array *tr); 501 502 extern unsigned long trace_adjust_address(struct trace_array *tr, unsigned long addr); 503 504 extern struct trace_array *printk_trace; 505 506 static inline bool trace_array_is_readonly(struct trace_array *tr) 507 { 508 /* backup instance is read only. */ 509 return tr->flags & TRACE_ARRAY_FL_RDONLY; 510 } 511 512 /* 513 * The global tracer (top) should be the first trace array added, 514 * but we check the flag anyway. 515 */ 516 static inline struct trace_array *top_trace_array(void) 517 { 518 struct trace_array *tr; 519 520 if (list_empty(&ftrace_trace_arrays)) 521 return NULL; 522 523 tr = list_entry(ftrace_trace_arrays.prev, 524 typeof(*tr), list); 525 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 526 return tr; 527 } 528 529 #define FTRACE_CMP_TYPE(var, type) \ 530 __builtin_types_compatible_p(typeof(var), type *) 531 532 #undef IF_ASSIGN 533 #define IF_ASSIGN(var, entry, etype, id) \ 534 if (FTRACE_CMP_TYPE(var, etype)) { \ 535 var = (typeof(var))(entry); \ 536 WARN_ON(id != 0 && (entry)->type != id); \ 537 break; \ 538 } 539 540 /* Will cause compile errors if type is not found. */ 541 extern void __ftrace_bad_type(void); 542 543 /* 544 * The trace_assign_type is a verifier that the entry type is 545 * the same as the type being assigned. To add new types simply 546 * add a line with the following format: 547 * 548 * IF_ASSIGN(var, ent, type, id); 549 * 550 * Where "type" is the trace type that includes the trace_entry 551 * as the "ent" item. And "id" is the trace identifier that is 552 * used in the trace_type enum. 553 * 554 * If the type can have more than one id, then use zero. 555 */ 556 #define trace_assign_type(var, ent) \ 557 do { \ 558 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 559 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 560 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 561 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 562 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 563 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 564 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 565 IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ 566 IF_ASSIGN(var, ent, struct osnoise_entry, TRACE_OSNOISE);\ 567 IF_ASSIGN(var, ent, struct timerlat_entry, TRACE_TIMERLAT);\ 568 IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ 569 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 570 TRACE_MMIO_RW); \ 571 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 572 TRACE_MMIO_MAP); \ 573 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 574 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 575 TRACE_GRAPH_ENT); \ 576 IF_ASSIGN(var, ent, struct fgraph_retaddr_ent_entry,\ 577 TRACE_GRAPH_RETADDR_ENT); \ 578 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 579 TRACE_GRAPH_RET); \ 580 IF_ASSIGN(var, ent, struct func_repeats_entry, \ 581 TRACE_FUNC_REPEATS); \ 582 __ftrace_bad_type(); \ 583 } while (0) 584 585 /* 586 * An option specific to a tracer. This is a boolean value. 587 * The bit is the bit index that sets its value on the 588 * flags value in struct tracer_flags. 589 */ 590 struct tracer_opt { 591 const char *name; /* Will appear on the trace_options file */ 592 u32 bit; /* Mask assigned in val field in tracer_flags */ 593 }; 594 595 /* 596 * The set of specific options for a tracer. Your tracer 597 * have to set the initial value of the flags val. 598 */ 599 struct tracer_flags { 600 u32 val; 601 struct tracer_opt *opts; 602 struct tracer *trace; 603 }; 604 605 /* Makes more easy to define a tracer opt */ 606 #define TRACER_OPT(s, b) .name = #s, .bit = b 607 608 609 struct trace_option_dentry { 610 struct tracer_opt *opt; 611 struct tracer_flags *flags; 612 struct trace_array *tr; 613 struct dentry *entry; 614 }; 615 616 /** 617 * struct tracer - a specific tracer and its callbacks to interact with tracefs 618 * @name: the name chosen to select it on the available_tracers file 619 * @init: called when one switches to this tracer (echo name > current_tracer) 620 * @reset: called when one switches to another tracer 621 * @start: called when tracing is unpaused (echo 1 > tracing_on) 622 * @stop: called when tracing is paused (echo 0 > tracing_on) 623 * @update_thresh: called when tracing_thresh is updated 624 * @open: called when the trace file is opened 625 * @pipe_open: called when the trace_pipe file is opened 626 * @close: called when the trace file is released 627 * @pipe_close: called when the trace_pipe file is released 628 * @read: override the default read callback on trace_pipe 629 * @splice_read: override the default splice_read callback on trace_pipe 630 * @selftest: selftest to run on boot (see trace_selftest.c) 631 * @print_headers: override the first lines that describe your columns 632 * @print_line: callback that prints a trace 633 * @set_flag: signals one of your private flags changed (trace_options file) 634 * @flags: your private flags 635 */ 636 struct tracer { 637 const char *name; 638 int (*init)(struct trace_array *tr); 639 void (*reset)(struct trace_array *tr); 640 void (*start)(struct trace_array *tr); 641 void (*stop)(struct trace_array *tr); 642 int (*update_thresh)(struct trace_array *tr); 643 void (*open)(struct trace_iterator *iter); 644 void (*pipe_open)(struct trace_iterator *iter); 645 void (*close)(struct trace_iterator *iter); 646 void (*pipe_close)(struct trace_iterator *iter); 647 ssize_t (*read)(struct trace_iterator *iter, 648 struct file *filp, char __user *ubuf, 649 size_t cnt, loff_t *ppos); 650 ssize_t (*splice_read)(struct trace_iterator *iter, 651 struct file *filp, 652 loff_t *ppos, 653 struct pipe_inode_info *pipe, 654 size_t len, 655 unsigned int flags); 656 #ifdef CONFIG_FTRACE_STARTUP_TEST 657 int (*selftest)(struct tracer *trace, 658 struct trace_array *tr); 659 #endif 660 void (*print_header)(struct seq_file *m); 661 enum print_line_t (*print_line)(struct trace_iterator *iter); 662 /* If you handled the flag setting, return 0 */ 663 int (*set_flag)(struct trace_array *tr, 664 u32 old_flags, u32 bit, int set); 665 /* Return 0 if OK with change, else return non-zero */ 666 int (*flag_changed)(struct trace_array *tr, 667 u64 mask, int set); 668 struct tracer *next; 669 struct tracer_flags *flags; 670 struct tracer_flags *default_flags; 671 int enabled; 672 bool print_max; 673 bool allow_instances; 674 #ifdef CONFIG_TRACER_MAX_TRACE 675 bool use_max_tr; 676 #endif 677 /* True if tracer cannot be enabled in kernel param */ 678 bool noboot; 679 }; 680 681 static inline struct ring_buffer_iter * 682 trace_buffer_iter(struct trace_iterator *iter, int cpu) 683 { 684 return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; 685 } 686 687 extern int tracing_disabled; 688 689 int tracer_init(struct tracer *t, struct trace_array *tr); 690 int tracing_is_enabled(void); 691 void tracing_reset_online_cpus(struct array_buffer *buf); 692 void tracing_reset_all_online_cpus(void); 693 void tracing_reset_all_online_cpus_unlocked(void); 694 int tracing_open_generic(struct inode *inode, struct file *filp); 695 int tracing_open_generic_tr(struct inode *inode, struct file *filp); 696 int tracing_release(struct inode *inode, struct file *file); 697 int tracing_release_generic_tr(struct inode *inode, struct file *file); 698 int tracing_open_file_tr(struct inode *inode, struct file *filp); 699 int tracing_release_file_tr(struct inode *inode, struct file *filp); 700 int tracing_single_release_file_tr(struct inode *inode, struct file *filp); 701 bool tracer_tracing_is_on(struct trace_array *tr); 702 void tracer_tracing_on(struct trace_array *tr); 703 void tracer_tracing_off(struct trace_array *tr); 704 void tracer_tracing_disable(struct trace_array *tr); 705 void tracer_tracing_enable(struct trace_array *tr); 706 int allocate_trace_buffer(struct trace_array *tr, struct array_buffer *buf, int size); 707 struct dentry *trace_create_file(const char *name, 708 umode_t mode, 709 struct dentry *parent, 710 void *data, 711 const struct file_operations *fops); 712 struct dentry *trace_create_cpu_file(const char *name, 713 umode_t mode, 714 struct dentry *parent, 715 void *data, 716 long cpu, 717 const struct file_operations *fops); 718 719 struct trace_iterator *__tracing_open(struct inode *inode, struct file *file, 720 bool snapshot); 721 int tracing_buffers_open(struct inode *inode, struct file *filp); 722 ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf, 723 size_t count, loff_t *ppos); 724 int tracing_buffers_release(struct inode *inode, struct file *file); 725 ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos, 726 struct pipe_inode_info *pipe, size_t len, unsigned int flags); 727 728 ssize_t tracing_nsecs_read(unsigned long *ptr, char __user *ubuf, 729 size_t cnt, loff_t *ppos); 730 ssize_t tracing_nsecs_write(unsigned long *ptr, const char __user *ubuf, 731 size_t cnt, loff_t *ppos); 732 733 void trace_set_buffer_entries(struct array_buffer *buf, unsigned long val); 734 735 /* 736 * Should be used after trace_array_get(), trace_types_lock 737 * ensures that i_cdev was already initialized. 738 */ 739 static inline int tracing_get_cpu(struct inode *inode) 740 { 741 if (inode->i_cdev) /* See trace_create_cpu_file() */ 742 return (long)inode->i_cdev - 1; 743 return RING_BUFFER_ALL_CPUS; 744 } 745 void tracing_reset_cpu(struct array_buffer *buf, int cpu); 746 747 struct ftrace_buffer_info { 748 struct trace_iterator iter; 749 void *spare; 750 unsigned int spare_cpu; 751 unsigned int spare_size; 752 unsigned int read; 753 }; 754 755 /** 756 * tracer_tracing_is_on_cpu - show real state of ring buffer enabled on for a cpu 757 * @tr : the trace array to know if ring buffer is enabled 758 * @cpu: The cpu buffer to check if enabled 759 * 760 * Shows real state of the per CPU buffer if it is enabled or not. 761 */ 762 static inline bool tracer_tracing_is_on_cpu(struct trace_array *tr, int cpu) 763 { 764 if (tr->array_buffer.buffer) 765 return ring_buffer_record_is_on_cpu(tr->array_buffer.buffer, cpu); 766 return false; 767 } 768 769 int tracing_init_dentry(void); 770 771 struct ring_buffer_event; 772 773 struct ring_buffer_event * 774 trace_buffer_lock_reserve(struct trace_buffer *buffer, 775 int type, 776 unsigned long len, 777 unsigned int trace_ctx); 778 779 int ring_buffer_meta_seq_init(struct file *file, struct trace_buffer *buffer, int cpu); 780 781 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 782 struct trace_array_cpu *data); 783 784 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 785 int *ent_cpu, u64 *ent_ts); 786 787 void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, 788 struct ring_buffer_event *event); 789 790 bool trace_is_tracepoint_string(const char *str); 791 const char *trace_event_format(struct trace_iterator *iter, const char *fmt); 792 char *trace_iter_expand_format(struct trace_iterator *iter); 793 bool ignore_event(struct trace_iterator *iter); 794 795 int trace_empty(struct trace_iterator *iter); 796 797 void *trace_find_next_entry_inc(struct trace_iterator *iter); 798 799 void trace_init_global_iter(struct trace_iterator *iter); 800 801 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 802 803 unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); 804 unsigned long trace_total_entries(struct trace_array *tr); 805 806 void trace_function(struct trace_array *tr, 807 unsigned long ip, 808 unsigned long parent_ip, 809 unsigned int trace_ctx, 810 struct ftrace_regs *regs); 811 void trace_graph_function(struct trace_array *tr, 812 unsigned long ip, 813 unsigned long parent_ip, 814 unsigned int trace_ctx); 815 void trace_latency_header(struct seq_file *m); 816 void trace_default_header(struct seq_file *m); 817 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 818 819 void trace_graph_return(struct ftrace_graph_ret *trace, struct fgraph_ops *gops, 820 struct ftrace_regs *fregs); 821 int trace_graph_entry(struct ftrace_graph_ent *trace, struct fgraph_ops *gops, 822 struct ftrace_regs *fregs); 823 824 void tracing_start_cmdline_record(void); 825 void tracing_stop_cmdline_record(void); 826 void tracing_start_tgid_record(void); 827 void tracing_stop_tgid_record(void); 828 829 int register_tracer(struct tracer *type); 830 int is_tracing_stopped(void); 831 832 loff_t tracing_lseek(struct file *file, loff_t offset, int whence); 833 834 extern cpumask_var_t __read_mostly tracing_buffer_mask; 835 836 #define for_each_tracing_cpu(cpu) \ 837 for_each_cpu(cpu, tracing_buffer_mask) 838 839 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 840 841 extern unsigned long tracing_thresh; 842 extern struct workqueue_struct *trace_init_wq __initdata; 843 844 /* PID filtering */ 845 846 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, 847 pid_t search_pid); 848 bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, 849 struct trace_pid_list *filtered_no_pids, 850 struct task_struct *task); 851 void trace_filter_add_remove_task(struct trace_pid_list *pid_list, 852 struct task_struct *self, 853 struct task_struct *task); 854 void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); 855 void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); 856 int trace_pid_show(struct seq_file *m, void *v); 857 int trace_pid_write(struct trace_pid_list *filtered_pids, 858 struct trace_pid_list **new_pid_list, 859 const char __user *ubuf, size_t cnt); 860 861 #ifdef CONFIG_TRACER_SNAPSHOT 862 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, 863 void *cond_data); 864 void update_max_tr_single(struct trace_array *tr, 865 struct task_struct *tsk, int cpu); 866 867 #if defined(CONFIG_TRACER_MAX_TRACE) && defined(CONFIG_FSNOTIFY) 868 # define LATENCY_FS_NOTIFY 869 #endif 870 #endif /* CONFIG_TRACER_SNAPSHOT */ 871 872 #ifdef LATENCY_FS_NOTIFY 873 void latency_fsnotify(struct trace_array *tr); 874 #else 875 static inline void latency_fsnotify(struct trace_array *tr) { } 876 #endif 877 878 #ifdef CONFIG_STACKTRACE 879 void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip); 880 #else 881 static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, 882 int skip) 883 { 884 } 885 #endif /* CONFIG_STACKTRACE */ 886 887 #ifdef CONFIG_TRACER_MAX_TRACE 888 static inline bool tracer_uses_snapshot(struct tracer *tracer) 889 { 890 return tracer->use_max_tr; 891 } 892 void trace_create_maxlat_file(struct trace_array *tr, 893 struct dentry *d_tracer); 894 #else 895 static inline bool tracer_uses_snapshot(struct tracer *tracer) 896 { 897 return false; 898 } 899 static inline void trace_create_maxlat_file(struct trace_array *tr, 900 struct dentry *d_tracer) { } 901 #endif 902 903 void trace_last_func_repeats(struct trace_array *tr, 904 struct trace_func_repeats *last_info, 905 unsigned int trace_ctx); 906 907 extern u64 ftrace_now(int cpu); 908 909 extern void trace_find_cmdline(int pid, char comm[]); 910 extern int trace_find_tgid(int pid); 911 extern void trace_event_follow_fork(struct trace_array *tr, bool enable); 912 913 extern int trace_events_enabled(struct trace_array *tr, const char *system); 914 915 #ifdef CONFIG_DYNAMIC_FTRACE 916 extern unsigned long ftrace_update_tot_cnt; 917 extern unsigned long ftrace_number_of_pages; 918 extern unsigned long ftrace_number_of_groups; 919 extern u64 ftrace_update_time; 920 extern u64 ftrace_total_mod_time; 921 void ftrace_init_trace_array(struct trace_array *tr); 922 #else 923 static inline void ftrace_init_trace_array(struct trace_array *tr) { } 924 #endif 925 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 926 extern int DYN_FTRACE_TEST_NAME(void); 927 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 928 extern int DYN_FTRACE_TEST_NAME2(void); 929 930 void __init trace_append_boot_param(char *buf, const char *str, 931 char sep, int size); 932 extern void trace_set_ring_buffer_expanded(struct trace_array *tr); 933 extern bool tracing_selftest_disabled; 934 935 #ifdef CONFIG_FTRACE_STARTUP_TEST 936 extern void __init disable_tracing_selftest(const char *reason); 937 938 extern int trace_selftest_startup_function(struct tracer *trace, 939 struct trace_array *tr); 940 extern int trace_selftest_startup_function_graph(struct tracer *trace, 941 struct trace_array *tr); 942 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 943 struct trace_array *tr); 944 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 945 struct trace_array *tr); 946 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 947 struct trace_array *tr); 948 extern int trace_selftest_startup_wakeup(struct tracer *trace, 949 struct trace_array *tr); 950 extern int trace_selftest_startup_nop(struct tracer *trace, 951 struct trace_array *tr); 952 extern int trace_selftest_startup_branch(struct tracer *trace, 953 struct trace_array *tr); 954 extern bool __read_mostly tracing_selftest_running; 955 /* 956 * Tracer data references selftest functions that only occur 957 * on boot up. These can be __init functions. Thus, when selftests 958 * are enabled, then the tracers need to reference __init functions. 959 */ 960 #define __tracer_data __refdata 961 #else 962 static inline void __init disable_tracing_selftest(const char *reason) 963 { 964 } 965 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 966 #define __tracer_data __read_mostly 967 #define tracing_selftest_running 0 968 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 969 970 extern void *head_page(struct trace_array_cpu *data); 971 extern unsigned long long ns2usecs(u64 nsec); 972 973 __printf(2, 0) 974 int trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 975 __printf(2, 0) 976 int trace_vprintk(unsigned long ip, const char *fmt, va_list args); 977 __printf(3, 0) 978 int trace_array_vprintk(struct trace_array *tr, 979 unsigned long ip, const char *fmt, va_list args); 980 __printf(3, 4) 981 int trace_array_printk_buf(struct trace_buffer *buffer, 982 unsigned long ip, const char *fmt, ...); 983 void trace_printk_seq(struct trace_seq *s); 984 enum print_line_t print_trace_line(struct trace_iterator *iter); 985 986 extern char trace_find_mark(unsigned long long duration); 987 988 struct ftrace_hash; 989 990 struct ftrace_mod_load { 991 struct list_head list; 992 char *func; 993 char *module; 994 int enable; 995 }; 996 997 enum { 998 FTRACE_HASH_FL_MOD = (1 << 0), 999 }; 1000 1001 struct ftrace_hash { 1002 unsigned long size_bits; 1003 struct hlist_head *buckets; 1004 unsigned long count; 1005 unsigned long flags; 1006 struct rcu_head rcu; 1007 }; 1008 1009 struct ftrace_func_entry * 1010 ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); 1011 1012 static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) 1013 { 1014 return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); 1015 } 1016 1017 /* Standard output formatting function used for function return traces */ 1018 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1019 1020 /* Flag options */ 1021 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 1022 #define TRACE_GRAPH_PRINT_CPU 0x2 1023 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 1024 #define TRACE_GRAPH_PRINT_PROC 0x8 1025 #define TRACE_GRAPH_PRINT_DURATION 0x10 1026 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 1027 #define TRACE_GRAPH_PRINT_REL_TIME 0x40 1028 #define TRACE_GRAPH_PRINT_IRQS 0x80 1029 #define TRACE_GRAPH_PRINT_TAIL 0x100 1030 #define TRACE_GRAPH_SLEEP_TIME 0x200 1031 #define TRACE_GRAPH_GRAPH_TIME 0x400 1032 #define TRACE_GRAPH_PRINT_RETVAL 0x800 1033 #define TRACE_GRAPH_PRINT_RETVAL_HEX 0x1000 1034 #define TRACE_GRAPH_PRINT_RETADDR 0x2000 1035 #define TRACE_GRAPH_ARGS 0x4000 1036 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 1037 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 1038 1039 #ifdef CONFIG_FUNCTION_PROFILER 1040 extern void ftrace_graph_graph_time_control(bool enable); 1041 #else 1042 static inline void ftrace_graph_graph_time_control(bool enable) { } 1043 #endif 1044 1045 extern enum print_line_t 1046 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 1047 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 1048 extern void 1049 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 1050 extern void graph_trace_open(struct trace_iterator *iter); 1051 extern void graph_trace_close(struct trace_iterator *iter); 1052 extern int __trace_graph_entry(struct trace_array *tr, 1053 struct ftrace_graph_ent *trace, 1054 unsigned int trace_ctx); 1055 extern int __trace_graph_retaddr_entry(struct trace_array *tr, 1056 struct ftrace_graph_ent *trace, 1057 unsigned int trace_ctx, 1058 unsigned long retaddr, 1059 struct ftrace_regs *fregs); 1060 extern void __trace_graph_return(struct trace_array *tr, 1061 struct ftrace_graph_ret *trace, 1062 unsigned int trace_ctx, 1063 u64 calltime, u64 rettime); 1064 1065 extern void init_array_fgraph_ops(struct trace_array *tr, struct ftrace_ops *ops); 1066 extern int allocate_fgraph_ops(struct trace_array *tr, struct ftrace_ops *ops); 1067 extern void free_fgraph_ops(struct trace_array *tr); 1068 1069 enum { 1070 TRACE_GRAPH_FL = 1, 1071 1072 /* 1073 * In the very unlikely case that an interrupt came in 1074 * at a start of graph tracing, and we want to trace 1075 * the function in that interrupt, the depth can be greater 1076 * than zero, because of the preempted start of a previous 1077 * trace. In an even more unlikely case, depth could be 2 1078 * if a softirq interrupted the start of graph tracing, 1079 * followed by an interrupt preempting a start of graph 1080 * tracing in the softirq, and depth can even be 3 1081 * if an NMI came in at the start of an interrupt function 1082 * that preempted a softirq start of a function that 1083 * preempted normal context!!!! Luckily, it can't be 1084 * greater than 3, so the next two bits are a mask 1085 * of what the depth is when we set TRACE_GRAPH_FL 1086 */ 1087 1088 TRACE_GRAPH_DEPTH_START_BIT, 1089 TRACE_GRAPH_DEPTH_END_BIT, 1090 1091 /* 1092 * To implement set_graph_notrace, if this bit is set, we ignore 1093 * function graph tracing of called functions, until the return 1094 * function is called to clear it. 1095 */ 1096 TRACE_GRAPH_NOTRACE_BIT, 1097 }; 1098 1099 #define TRACE_GRAPH_NOTRACE (1 << TRACE_GRAPH_NOTRACE_BIT) 1100 1101 static inline unsigned long ftrace_graph_depth(unsigned long *task_var) 1102 { 1103 return (*task_var >> TRACE_GRAPH_DEPTH_START_BIT) & 3; 1104 } 1105 1106 static inline void ftrace_graph_set_depth(unsigned long *task_var, int depth) 1107 { 1108 *task_var &= ~(3 << TRACE_GRAPH_DEPTH_START_BIT); 1109 *task_var |= (depth & 3) << TRACE_GRAPH_DEPTH_START_BIT; 1110 } 1111 1112 #ifdef CONFIG_DYNAMIC_FTRACE 1113 extern struct ftrace_hash __rcu *ftrace_graph_hash; 1114 extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; 1115 1116 static inline int 1117 ftrace_graph_addr(unsigned long *task_var, struct ftrace_graph_ent *trace) 1118 { 1119 unsigned long addr = trace->func; 1120 int ret = 0; 1121 struct ftrace_hash *hash; 1122 1123 preempt_disable_notrace(); 1124 1125 /* 1126 * Have to open code "rcu_dereference_sched()" because the 1127 * function graph tracer can be called when RCU is not 1128 * "watching". 1129 * Protected with schedule_on_each_cpu(ftrace_sync) 1130 */ 1131 hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); 1132 1133 if (ftrace_hash_empty(hash)) { 1134 ret = 1; 1135 goto out; 1136 } 1137 1138 if (ftrace_lookup_ip(hash, addr)) { 1139 /* 1140 * This needs to be cleared on the return functions 1141 * when the depth is zero. 1142 */ 1143 *task_var |= TRACE_GRAPH_FL; 1144 ftrace_graph_set_depth(task_var, trace->depth); 1145 1146 /* 1147 * If no irqs are to be traced, but a set_graph_function 1148 * is set, and called by an interrupt handler, we still 1149 * want to trace it. 1150 */ 1151 if (in_hardirq()) 1152 trace_recursion_set(TRACE_IRQ_BIT); 1153 else 1154 trace_recursion_clear(TRACE_IRQ_BIT); 1155 ret = 1; 1156 } 1157 1158 out: 1159 preempt_enable_notrace(); 1160 return ret; 1161 } 1162 1163 static inline void 1164 ftrace_graph_addr_finish(struct fgraph_ops *gops, struct ftrace_graph_ret *trace) 1165 { 1166 unsigned long *task_var = fgraph_get_task_var(gops); 1167 1168 if ((*task_var & TRACE_GRAPH_FL) && 1169 trace->depth == ftrace_graph_depth(task_var)) 1170 *task_var &= ~TRACE_GRAPH_FL; 1171 } 1172 1173 static inline int ftrace_graph_notrace_addr(unsigned long addr) 1174 { 1175 int ret = 0; 1176 struct ftrace_hash *notrace_hash; 1177 1178 preempt_disable_notrace(); 1179 1180 /* 1181 * Have to open code "rcu_dereference_sched()" because the 1182 * function graph tracer can be called when RCU is not 1183 * "watching". 1184 * Protected with schedule_on_each_cpu(ftrace_sync) 1185 */ 1186 notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, 1187 !preemptible()); 1188 1189 if (ftrace_lookup_ip(notrace_hash, addr)) 1190 ret = 1; 1191 1192 preempt_enable_notrace(); 1193 return ret; 1194 } 1195 #else 1196 static inline int ftrace_graph_addr(unsigned long *task_var, struct ftrace_graph_ent *trace) 1197 { 1198 return 1; 1199 } 1200 1201 static inline int ftrace_graph_notrace_addr(unsigned long addr) 1202 { 1203 return 0; 1204 } 1205 static inline void ftrace_graph_addr_finish(struct fgraph_ops *gops, struct ftrace_graph_ret *trace) 1206 { } 1207 #endif /* CONFIG_DYNAMIC_FTRACE */ 1208 1209 extern unsigned int fgraph_max_depth; 1210 extern int fgraph_no_sleep_time; 1211 extern bool fprofile_no_sleep_time; 1212 1213 static inline bool 1214 ftrace_graph_ignore_func(struct fgraph_ops *gops, struct ftrace_graph_ent *trace) 1215 { 1216 unsigned long *task_var = fgraph_get_task_var(gops); 1217 1218 /* trace it when it is-nested-in or is a function enabled. */ 1219 return !((*task_var & TRACE_GRAPH_FL) || 1220 ftrace_graph_addr(task_var, trace)) || 1221 (trace->depth < 0) || 1222 (fgraph_max_depth && trace->depth >= fgraph_max_depth); 1223 } 1224 1225 void fgraph_init_ops(struct ftrace_ops *dst_ops, 1226 struct ftrace_ops *src_ops); 1227 1228 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 1229 static inline enum print_line_t 1230 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 1231 { 1232 return TRACE_TYPE_UNHANDLED; 1233 } 1234 static inline void free_fgraph_ops(struct trace_array *tr) { } 1235 /* ftrace_ops may not be defined */ 1236 #define init_array_fgraph_ops(tr, ops) do { } while (0) 1237 #define allocate_fgraph_ops(tr, ops) ({ 0; }) 1238 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 1239 1240 extern struct list_head ftrace_pids; 1241 1242 #ifdef CONFIG_FUNCTION_TRACER 1243 1244 #define FTRACE_PID_IGNORE -1 1245 #define FTRACE_PID_TRACE -2 1246 1247 struct ftrace_func_command { 1248 struct list_head list; 1249 char *name; 1250 int (*func)(struct trace_array *tr, 1251 struct ftrace_hash *hash, 1252 char *func, char *cmd, 1253 char *params, int enable); 1254 }; 1255 extern bool ftrace_filter_param __initdata; 1256 extern int ftrace_is_dead(void); 1257 int ftrace_create_function_files(struct trace_array *tr, 1258 struct dentry *parent); 1259 void ftrace_destroy_function_files(struct trace_array *tr); 1260 int ftrace_allocate_ftrace_ops(struct trace_array *tr); 1261 void ftrace_free_ftrace_ops(struct trace_array *tr); 1262 void ftrace_init_global_array_ops(struct trace_array *tr); 1263 struct trace_array *trace_get_global_array(void); 1264 void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); 1265 void ftrace_reset_array_ops(struct trace_array *tr); 1266 void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); 1267 void ftrace_init_tracefs_toplevel(struct trace_array *tr, 1268 struct dentry *d_tracer); 1269 void ftrace_clear_pids(struct trace_array *tr); 1270 int init_function_trace(void); 1271 void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); 1272 #else 1273 static inline int ftrace_is_dead(void) { return 0; } 1274 static inline int 1275 ftrace_create_function_files(struct trace_array *tr, 1276 struct dentry *parent) 1277 { 1278 return 0; 1279 } 1280 static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) 1281 { 1282 return 0; 1283 } 1284 static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } 1285 static inline void ftrace_destroy_function_files(struct trace_array *tr) { } 1286 static inline __init void 1287 ftrace_init_global_array_ops(struct trace_array *tr) { } 1288 static inline void ftrace_reset_array_ops(struct trace_array *tr) { } 1289 static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } 1290 static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } 1291 static inline void ftrace_clear_pids(struct trace_array *tr) { } 1292 static inline int init_function_trace(void) { return 0; } 1293 static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } 1294 /* ftace_func_t type is not defined, use macro instead of static inline */ 1295 #define ftrace_init_array_ops(tr, func) do { } while (0) 1296 #endif /* CONFIG_FUNCTION_TRACER */ 1297 1298 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 1299 1300 struct ftrace_probe_ops { 1301 void (*func)(unsigned long ip, 1302 unsigned long parent_ip, 1303 struct trace_array *tr, 1304 struct ftrace_probe_ops *ops, 1305 void *data); 1306 int (*init)(struct ftrace_probe_ops *ops, 1307 struct trace_array *tr, 1308 unsigned long ip, void *init_data, 1309 void **data); 1310 void (*free)(struct ftrace_probe_ops *ops, 1311 struct trace_array *tr, 1312 unsigned long ip, void *data); 1313 int (*print)(struct seq_file *m, 1314 unsigned long ip, 1315 struct ftrace_probe_ops *ops, 1316 void *data); 1317 }; 1318 1319 struct ftrace_func_mapper; 1320 typedef int (*ftrace_mapper_func)(void *data); 1321 1322 struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); 1323 void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, 1324 unsigned long ip); 1325 int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, 1326 unsigned long ip, void *data); 1327 void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, 1328 unsigned long ip); 1329 void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 1330 ftrace_mapper_func free_func); 1331 1332 extern int 1333 register_ftrace_function_probe(char *glob, struct trace_array *tr, 1334 struct ftrace_probe_ops *ops, void *data); 1335 extern int 1336 unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, 1337 struct ftrace_probe_ops *ops); 1338 extern void clear_ftrace_function_probes(struct trace_array *tr); 1339 1340 int register_ftrace_command(struct ftrace_func_command *cmd); 1341 int unregister_ftrace_command(struct ftrace_func_command *cmd); 1342 1343 void ftrace_create_filter_files(struct ftrace_ops *ops, 1344 struct dentry *parent); 1345 void ftrace_destroy_filter_files(struct ftrace_ops *ops); 1346 1347 extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, 1348 int len, int reset); 1349 extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, 1350 int len, int reset); 1351 #else 1352 struct ftrace_func_command; 1353 1354 static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) 1355 { 1356 return -EINVAL; 1357 } 1358 static inline __init int unregister_ftrace_command(char *cmd_name) 1359 { 1360 return -EINVAL; 1361 } 1362 static inline void clear_ftrace_function_probes(struct trace_array *tr) 1363 { 1364 } 1365 1366 /* 1367 * The ops parameter passed in is usually undefined. 1368 * This must be a macro. 1369 */ 1370 #define ftrace_create_filter_files(ops, parent) do { } while (0) 1371 #define ftrace_destroy_filter_files(ops) do { } while (0) 1372 #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ 1373 1374 bool ftrace_event_is_function(struct trace_event_call *call); 1375 1376 /* 1377 * struct trace_parser - servers for reading the user input separated by spaces 1378 * @cont: set if the input is not complete - no final space char was found 1379 * @buffer: holds the parsed user input 1380 * @idx: user input length 1381 * @size: buffer size 1382 */ 1383 struct trace_parser { 1384 bool cont; 1385 bool fail; 1386 char *buffer; 1387 unsigned idx; 1388 unsigned size; 1389 }; 1390 1391 static inline bool trace_parser_loaded(struct trace_parser *parser) 1392 { 1393 return !parser->fail && parser->idx != 0; 1394 } 1395 1396 static inline bool trace_parser_cont(struct trace_parser *parser) 1397 { 1398 return parser->cont; 1399 } 1400 1401 static inline void trace_parser_clear(struct trace_parser *parser) 1402 { 1403 parser->cont = false; 1404 parser->idx = 0; 1405 } 1406 1407 static inline void trace_parser_fail(struct trace_parser *parser) 1408 { 1409 parser->fail = true; 1410 } 1411 1412 extern int trace_parser_get_init(struct trace_parser *parser, int size); 1413 extern void trace_parser_put(struct trace_parser *parser); 1414 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 1415 size_t cnt, loff_t *ppos); 1416 1417 /* 1418 * Only create function graph options if function graph is configured. 1419 */ 1420 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1421 # define FGRAPH_FLAGS \ 1422 C(DISPLAY_GRAPH, "display-graph"), 1423 #else 1424 # define FGRAPH_FLAGS 1425 #endif 1426 1427 #ifdef CONFIG_BRANCH_TRACER 1428 # define BRANCH_FLAGS \ 1429 C(BRANCH, "branch"), 1430 #else 1431 # define BRANCH_FLAGS 1432 #endif 1433 1434 #ifdef CONFIG_FUNCTION_TRACER 1435 # define FUNCTION_FLAGS \ 1436 C(FUNCTION, "function-trace"), \ 1437 C(FUNC_FORK, "function-fork"), 1438 # define FUNCTION_DEFAULT_FLAGS TRACE_ITER(FUNCTION) 1439 #else 1440 # define FUNCTION_FLAGS 1441 # define FUNCTION_DEFAULT_FLAGS 0UL 1442 # define TRACE_ITER_FUNC_FORK_BIT -1 1443 #endif 1444 1445 #ifdef CONFIG_STACKTRACE 1446 # define STACK_FLAGS \ 1447 C(STACKTRACE, "stacktrace"), 1448 #else 1449 # define STACK_FLAGS 1450 #endif 1451 1452 #ifdef CONFIG_FUNCTION_PROFILER 1453 # define PROFILER_FLAGS \ 1454 C(PROF_TEXT_OFFSET, "prof-text-offset"), 1455 # ifdef CONFIG_FUNCTION_GRAPH_TRACER 1456 # define FPROFILE_FLAGS \ 1457 C(GRAPH_TIME, "graph-time"), 1458 # define FPROFILE_DEFAULT_FLAGS TRACE_ITER(GRAPH_TIME) 1459 # else 1460 # define FPROFILE_FLAGS 1461 # define FPROFILE_DEFAULT_FLAGS 0UL 1462 # endif 1463 #else 1464 # define PROFILER_FLAGS 1465 # define FPROFILE_FLAGS 1466 # define FPROFILE_DEFAULT_FLAGS 0UL 1467 # define TRACE_ITER_PROF_TEXT_OFFSET_BIT -1 1468 #endif 1469 1470 /* 1471 * trace_iterator_flags is an enumeration that defines bit 1472 * positions into trace_flags that controls the output. 1473 * 1474 * NOTE: These bits must match the trace_options array in 1475 * trace.c (this macro guarantees it). 1476 */ 1477 #define TRACE_FLAGS \ 1478 C(PRINT_PARENT, "print-parent"), \ 1479 C(SYM_OFFSET, "sym-offset"), \ 1480 C(SYM_ADDR, "sym-addr"), \ 1481 C(VERBOSE, "verbose"), \ 1482 C(RAW, "raw"), \ 1483 C(HEX, "hex"), \ 1484 C(BIN, "bin"), \ 1485 C(BLOCK, "block"), \ 1486 C(FIELDS, "fields"), \ 1487 C(PRINTK, "trace_printk"), \ 1488 C(ANNOTATE, "annotate"), \ 1489 C(USERSTACKTRACE, "userstacktrace"), \ 1490 C(SYM_USEROBJ, "sym-userobj"), \ 1491 C(PRINTK_MSGONLY, "printk-msg-only"), \ 1492 C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ 1493 C(LATENCY_FMT, "latency-format"), \ 1494 C(RECORD_CMD, "record-cmd"), \ 1495 C(RECORD_TGID, "record-tgid"), \ 1496 C(OVERWRITE, "overwrite"), \ 1497 C(STOP_ON_FREE, "disable_on_free"), \ 1498 C(IRQ_INFO, "irq-info"), \ 1499 C(MARKERS, "markers"), \ 1500 C(EVENT_FORK, "event-fork"), \ 1501 C(TRACE_PRINTK, "trace_printk_dest"), \ 1502 C(COPY_MARKER, "copy_trace_marker"), \ 1503 C(PAUSE_ON_TRACE, "pause-on-trace"), \ 1504 C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \ 1505 C(BITMASK_LIST, "bitmask-list"), \ 1506 FUNCTION_FLAGS \ 1507 FGRAPH_FLAGS \ 1508 STACK_FLAGS \ 1509 BRANCH_FLAGS \ 1510 PROFILER_FLAGS \ 1511 FPROFILE_FLAGS 1512 1513 /* 1514 * By defining C, we can make TRACE_FLAGS a list of bit names 1515 * that will define the bits for the flag masks. 1516 */ 1517 #undef C 1518 #define C(a, b) TRACE_ITER_##a##_BIT 1519 1520 enum trace_iterator_bits { 1521 TRACE_FLAGS 1522 /* Make sure we don't go more than we have bits for */ 1523 TRACE_ITER_LAST_BIT 1524 }; 1525 1526 /* 1527 * And use TRACE_ITER(flag) to define the bit masks. 1528 */ 1529 #define TRACE_ITER(flag) \ 1530 (TRACE_ITER_##flag##_BIT < 0 ? 0 : 1ULL << (TRACE_ITER_##flag##_BIT)) 1531 1532 /* 1533 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 1534 * control the output of kernel symbols. 1535 */ 1536 #define TRACE_ITER_SYM_MASK \ 1537 (TRACE_ITER(PRINT_PARENT)|TRACE_ITER(SYM_OFFSET)|TRACE_ITER(SYM_ADDR)) 1538 1539 extern struct tracer nop_trace; 1540 1541 #ifdef CONFIG_BRANCH_TRACER 1542 extern int enable_branch_tracing(struct trace_array *tr); 1543 extern void disable_branch_tracing(void); 1544 static inline int trace_branch_enable(struct trace_array *tr) 1545 { 1546 if (tr->trace_flags & TRACE_ITER(BRANCH)) 1547 return enable_branch_tracing(tr); 1548 return 0; 1549 } 1550 static inline void trace_branch_disable(void) 1551 { 1552 /* due to races, always disable */ 1553 disable_branch_tracing(); 1554 } 1555 #else 1556 static inline int trace_branch_enable(struct trace_array *tr) 1557 { 1558 return 0; 1559 } 1560 static inline void trace_branch_disable(void) 1561 { 1562 } 1563 #endif /* CONFIG_BRANCH_TRACER */ 1564 1565 /* set ring buffers to default size if not already done so */ 1566 int tracing_update_buffers(struct trace_array *tr); 1567 1568 union trace_synth_field { 1569 u8 as_u8; 1570 u16 as_u16; 1571 u32 as_u32; 1572 u64 as_u64; 1573 struct trace_dynamic_info as_dynamic; 1574 }; 1575 1576 struct ftrace_event_field { 1577 struct list_head link; 1578 const char *name; 1579 const char *type; 1580 int filter_type; 1581 int offset; 1582 int size; 1583 unsigned int is_signed:1; 1584 unsigned int needs_test:1; 1585 int len; 1586 }; 1587 1588 struct prog_entry; 1589 1590 struct event_filter { 1591 struct prog_entry __rcu *prog; 1592 char *filter_string; 1593 }; 1594 1595 struct event_subsystem { 1596 struct list_head list; 1597 const char *name; 1598 struct event_filter *filter; 1599 int ref_count; 1600 }; 1601 1602 struct trace_subsystem_dir { 1603 struct list_head list; 1604 struct event_subsystem *subsystem; 1605 struct trace_array *tr; 1606 struct eventfs_inode *ei; 1607 int ref_count; 1608 int nr_events; 1609 }; 1610 1611 void trace_buffer_unlock_commit_regs(struct trace_array *tr, 1612 struct trace_buffer *buffer, 1613 struct ring_buffer_event *event, 1614 unsigned int trcace_ctx, 1615 struct pt_regs *regs); 1616 1617 static inline void trace_buffer_unlock_commit(struct trace_array *tr, 1618 struct trace_buffer *buffer, 1619 struct ring_buffer_event *event, 1620 unsigned int trace_ctx) 1621 { 1622 trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL); 1623 } 1624 1625 DECLARE_PER_CPU(bool, trace_taskinfo_save); 1626 int trace_save_cmdline(struct task_struct *tsk); 1627 int trace_create_savedcmd(void); 1628 int trace_alloc_tgid_map(void); 1629 void trace_free_saved_cmdlines_buffer(void); 1630 1631 extern const struct file_operations tracing_saved_cmdlines_fops; 1632 extern const struct file_operations tracing_saved_tgids_fops; 1633 extern const struct file_operations tracing_saved_cmdlines_size_fops; 1634 1635 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); 1636 DECLARE_PER_CPU(int, trace_buffered_event_cnt); 1637 void trace_buffered_event_disable(void); 1638 void trace_buffered_event_enable(void); 1639 1640 void early_enable_events(struct trace_array *tr, char *buf, bool disable_first); 1641 1642 struct trace_user_buf; 1643 struct trace_user_buf_info { 1644 struct trace_user_buf __percpu *tbuf; 1645 size_t size; 1646 int ref; 1647 }; 1648 1649 typedef int (*trace_user_buf_copy)(char *dst, const char __user *src, 1650 size_t size, void *data); 1651 int trace_user_fault_init(struct trace_user_buf_info *tinfo, size_t size); 1652 int trace_user_fault_get(struct trace_user_buf_info *tinfo); 1653 int trace_user_fault_put(struct trace_user_buf_info *tinfo); 1654 void trace_user_fault_destroy(struct trace_user_buf_info *tinfo); 1655 char *trace_user_fault_read(struct trace_user_buf_info *tinfo, 1656 const char __user *ptr, size_t size, 1657 trace_user_buf_copy copy_func, void *data); 1658 1659 static __always_inline void 1660 trace_event_setup(struct ring_buffer_event *event, 1661 int type, unsigned int trace_ctx) 1662 { 1663 struct trace_entry *ent = ring_buffer_event_data(event); 1664 1665 tracing_generic_entry_update(ent, type, trace_ctx); 1666 } 1667 1668 static __always_inline struct ring_buffer_event * 1669 __trace_buffer_lock_reserve(struct trace_buffer *buffer, 1670 int type, 1671 unsigned long len, 1672 unsigned int trace_ctx) 1673 { 1674 struct ring_buffer_event *event; 1675 1676 event = ring_buffer_lock_reserve(buffer, len); 1677 if (event != NULL) 1678 trace_event_setup(event, type, trace_ctx); 1679 1680 return event; 1681 } 1682 1683 static __always_inline void 1684 __buffer_unlock_commit(struct trace_buffer *buffer, struct ring_buffer_event *event) 1685 { 1686 __this_cpu_write(trace_taskinfo_save, true); 1687 1688 /* If this is the temp buffer, we need to commit fully */ 1689 if (this_cpu_read(trace_buffered_event) == event) { 1690 /* Length is in event->array[0] */ 1691 ring_buffer_write(buffer, event->array[0], &event->array[1]); 1692 /* Release the temp buffer */ 1693 this_cpu_dec(trace_buffered_event_cnt); 1694 /* ring_buffer_unlock_commit() enables preemption */ 1695 preempt_enable_notrace(); 1696 } else 1697 ring_buffer_unlock_commit(buffer); 1698 } 1699 1700 static inline void 1701 __trace_event_discard_commit(struct trace_buffer *buffer, 1702 struct ring_buffer_event *event) 1703 { 1704 if (this_cpu_read(trace_buffered_event) == event) { 1705 /* Simply release the temp buffer and enable preemption */ 1706 this_cpu_dec(trace_buffered_event_cnt); 1707 preempt_enable_notrace(); 1708 return; 1709 } 1710 /* ring_buffer_discard_commit() enables preemption */ 1711 ring_buffer_discard_commit(buffer, event); 1712 } 1713 1714 /* 1715 * Helper function for event_trigger_unlock_commit{_regs}(). 1716 * If there are event triggers attached to this event that requires 1717 * filtering against its fields, then they will be called as the 1718 * entry already holds the field information of the current event. 1719 * 1720 * It also checks if the event should be discarded or not. 1721 * It is to be discarded if the event is soft disabled and the 1722 * event was only recorded to process triggers, or if the event 1723 * filter is active and this event did not match the filters. 1724 * 1725 * Returns true if the event is discarded, false otherwise. 1726 */ 1727 static inline bool 1728 __event_trigger_test_discard(struct trace_event_file *file, 1729 struct trace_buffer *buffer, 1730 struct ring_buffer_event *event, 1731 void *entry, 1732 enum event_trigger_type *tt) 1733 { 1734 unsigned long eflags = file->flags; 1735 1736 if (eflags & EVENT_FILE_FL_TRIGGER_COND) 1737 *tt = event_triggers_call(file, buffer, entry, event); 1738 1739 if (likely(!(file->flags & (EVENT_FILE_FL_SOFT_DISABLED | 1740 EVENT_FILE_FL_FILTERED | 1741 EVENT_FILE_FL_PID_FILTER)))) 1742 return false; 1743 1744 if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) 1745 goto discard; 1746 1747 if (file->flags & EVENT_FILE_FL_FILTERED && 1748 !filter_match_preds(file->filter, entry)) 1749 goto discard; 1750 1751 if ((file->flags & EVENT_FILE_FL_PID_FILTER) && 1752 trace_event_ignore_this_pid(file)) 1753 goto discard; 1754 1755 return false; 1756 discard: 1757 __trace_event_discard_commit(buffer, event); 1758 return true; 1759 } 1760 1761 /** 1762 * event_trigger_unlock_commit - handle triggers and finish event commit 1763 * @file: The file pointer associated with the event 1764 * @buffer: The ring buffer that the event is being written to 1765 * @event: The event meta data in the ring buffer 1766 * @entry: The event itself 1767 * @trace_ctx: The tracing context flags. 1768 * 1769 * This is a helper function to handle triggers that require data 1770 * from the event itself. It also tests the event against filters and 1771 * if the event is soft disabled and should be discarded. 1772 */ 1773 static inline void 1774 event_trigger_unlock_commit(struct trace_event_file *file, 1775 struct trace_buffer *buffer, 1776 struct ring_buffer_event *event, 1777 void *entry, unsigned int trace_ctx) 1778 { 1779 enum event_trigger_type tt = ETT_NONE; 1780 1781 if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) 1782 trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx); 1783 1784 if (tt) 1785 event_triggers_post_call(file, tt); 1786 } 1787 1788 #define FILTER_PRED_INVALID ((unsigned short)-1) 1789 #define FILTER_PRED_IS_RIGHT (1 << 15) 1790 #define FILTER_PRED_FOLD (1 << 15) 1791 1792 /* 1793 * The max preds is the size of unsigned short with 1794 * two flags at the MSBs. One bit is used for both the IS_RIGHT 1795 * and FOLD flags. The other is reserved. 1796 * 1797 * 2^14 preds is way more than enough. 1798 */ 1799 #define MAX_FILTER_PRED 16384 1800 1801 struct filter_pred; 1802 struct regex; 1803 1804 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 1805 1806 enum regex_type { 1807 MATCH_FULL = 0, 1808 MATCH_FRONT_ONLY, 1809 MATCH_MIDDLE_ONLY, 1810 MATCH_END_ONLY, 1811 MATCH_GLOB, 1812 MATCH_INDEX, 1813 }; 1814 1815 struct regex { 1816 char pattern[MAX_FILTER_STR_VAL]; 1817 int len; 1818 int field_len; 1819 regex_match_func match; 1820 }; 1821 1822 static inline bool is_string_field(struct ftrace_event_field *field) 1823 { 1824 return field->filter_type == FILTER_DYN_STRING || 1825 field->filter_type == FILTER_RDYN_STRING || 1826 field->filter_type == FILTER_STATIC_STRING || 1827 field->filter_type == FILTER_PTR_STRING || 1828 field->filter_type == FILTER_COMM; 1829 } 1830 1831 static inline bool is_function_field(struct ftrace_event_field *field) 1832 { 1833 return field->filter_type == FILTER_TRACE_FN; 1834 } 1835 1836 extern enum regex_type 1837 filter_parse_regex(char *buff, int len, char **search, int *not); 1838 extern void print_event_filter(struct trace_event_file *file, 1839 struct trace_seq *s); 1840 extern int apply_event_filter(struct trace_event_file *file, 1841 char *filter_string); 1842 extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, 1843 char *filter_string); 1844 extern void print_subsystem_event_filter(struct event_subsystem *system, 1845 struct trace_seq *s); 1846 extern int filter_assign_type(const char *type); 1847 extern int create_event_filter(struct trace_array *tr, 1848 struct trace_event_call *call, 1849 char *filter_str, bool set_str, 1850 struct event_filter **filterp); 1851 extern void free_event_filter(struct event_filter *filter); 1852 1853 struct ftrace_event_field * 1854 trace_find_event_field(struct trace_event_call *call, char *name); 1855 1856 extern void trace_event_enable_cmd_record(bool enable); 1857 extern void trace_event_enable_tgid_record(bool enable); 1858 1859 extern int event_trace_init(void); 1860 extern int init_events(void); 1861 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1862 extern int event_trace_del_tracer(struct trace_array *tr); 1863 extern void __trace_early_add_events(struct trace_array *tr); 1864 1865 extern struct trace_event_file *__find_event_file(struct trace_array *tr, 1866 const char *system, 1867 const char *event); 1868 extern struct trace_event_file *find_event_file(struct trace_array *tr, 1869 const char *system, 1870 const char *event); 1871 1872 extern struct mutex event_mutex; 1873 extern struct list_head ftrace_events; 1874 1875 /* 1876 * When the trace_event_file is the filp->i_private pointer, 1877 * it must be taken under the event_mutex lock, and then checked 1878 * if the EVENT_FILE_FL_FREED flag is set. If it is, then the 1879 * data pointed to by the trace_event_file can not be trusted. 1880 * 1881 * Use the event_file_file() to access the trace_event_file from 1882 * the filp the first time under the event_mutex and check for 1883 * NULL. If it is needed to be retrieved again and the event_mutex 1884 * is still held, then the event_file_data() can be used and it 1885 * is guaranteed to be valid. 1886 */ 1887 static inline struct trace_event_file *event_file_file(struct file *filp) 1888 { 1889 struct trace_event_file *file; 1890 1891 lockdep_assert_held(&event_mutex); 1892 file = file_inode(filp)->i_private; 1893 if (!file || file->flags & EVENT_FILE_FL_FREED) 1894 return NULL; 1895 return file; 1896 } 1897 1898 static inline void *event_file_data(struct file *filp) 1899 { 1900 struct trace_event_file *file; 1901 1902 lockdep_assert_held(&event_mutex); 1903 file = file_inode(filp)->i_private; 1904 WARN_ON(!file || file->flags & EVENT_FILE_FL_FREED); 1905 return file; 1906 } 1907 1908 extern const struct file_operations event_trigger_fops; 1909 extern const struct file_operations event_hist_fops; 1910 extern const struct file_operations event_hist_debug_fops; 1911 extern const struct file_operations event_inject_fops; 1912 1913 #ifdef CONFIG_HIST_TRIGGERS 1914 extern int register_trigger_hist_cmd(void); 1915 extern int register_trigger_hist_enable_disable_cmds(void); 1916 #else 1917 static inline int register_trigger_hist_cmd(void) { return 0; } 1918 static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } 1919 #endif 1920 1921 extern int register_trigger_cmds(void); 1922 extern void clear_event_triggers(struct trace_array *tr); 1923 1924 enum { 1925 EVENT_TRIGGER_FL_PROBE = BIT(0), 1926 EVENT_TRIGGER_FL_COUNT = BIT(1), 1927 }; 1928 1929 struct event_trigger_data { 1930 unsigned long count; 1931 int ref; 1932 int flags; 1933 struct event_command *cmd_ops; 1934 struct event_filter __rcu *filter; 1935 char *filter_str; 1936 void *private_data; 1937 bool paused; 1938 bool paused_tmp; 1939 struct list_head list; 1940 char *name; 1941 struct list_head named_list; 1942 struct event_trigger_data *named_data; 1943 struct llist_node llist; 1944 }; 1945 1946 /* Avoid typos */ 1947 #define ENABLE_EVENT_STR "enable_event" 1948 #define DISABLE_EVENT_STR "disable_event" 1949 #define ENABLE_HIST_STR "enable_hist" 1950 #define DISABLE_HIST_STR "disable_hist" 1951 1952 struct enable_trigger_data { 1953 struct trace_event_file *file; 1954 bool enable; 1955 bool hist; 1956 }; 1957 1958 bool event_trigger_count(struct event_trigger_data *data, 1959 struct trace_buffer *buffer, void *rec, 1960 struct ring_buffer_event *event); 1961 1962 extern int event_enable_trigger_print(struct seq_file *m, 1963 struct event_trigger_data *data); 1964 extern void event_enable_trigger_free(struct event_trigger_data *data); 1965 extern int event_enable_trigger_parse(struct event_command *cmd_ops, 1966 struct trace_event_file *file, 1967 char *glob, char *cmd, 1968 char *param_and_filter); 1969 extern int event_enable_register_trigger(char *glob, 1970 struct event_trigger_data *data, 1971 struct trace_event_file *file); 1972 extern void event_enable_unregister_trigger(char *glob, 1973 struct event_trigger_data *test, 1974 struct trace_event_file *file); 1975 extern struct event_trigger_data * 1976 trigger_data_alloc(struct event_command *cmd_ops, char *cmd, char *param, 1977 void *private_data); 1978 extern void trigger_data_free(struct event_trigger_data *data); 1979 extern int event_trigger_init(struct event_trigger_data *data); 1980 extern int trace_event_trigger_enable_disable(struct trace_event_file *file, 1981 int trigger_enable); 1982 extern void update_cond_flag(struct trace_event_file *file); 1983 extern int set_trigger_filter(char *filter_str, 1984 struct event_trigger_data *trigger_data, 1985 struct trace_event_file *file); 1986 extern struct event_trigger_data *find_named_trigger(const char *name); 1987 extern bool is_named_trigger(struct event_trigger_data *test); 1988 extern int save_named_trigger(const char *name, 1989 struct event_trigger_data *data); 1990 extern void del_named_trigger(struct event_trigger_data *data); 1991 extern void pause_named_trigger(struct event_trigger_data *data); 1992 extern void unpause_named_trigger(struct event_trigger_data *data); 1993 extern void set_named_trigger_data(struct event_trigger_data *data, 1994 struct event_trigger_data *named_data); 1995 extern struct event_trigger_data * 1996 get_named_trigger_data(struct event_trigger_data *data); 1997 extern int register_event_command(struct event_command *cmd); 1998 extern int unregister_event_command(struct event_command *cmd); 1999 extern int register_trigger_hist_enable_disable_cmds(void); 2000 extern bool event_trigger_check_remove(const char *glob); 2001 extern bool event_trigger_empty_param(const char *param); 2002 extern int event_trigger_separate_filter(char *param_and_filter, char **param, 2003 char **filter, bool param_required); 2004 extern int event_trigger_parse_num(char *trigger, 2005 struct event_trigger_data *trigger_data); 2006 extern int event_trigger_set_filter(struct event_command *cmd_ops, 2007 struct trace_event_file *file, 2008 char *param, 2009 struct event_trigger_data *trigger_data); 2010 extern void event_trigger_reset_filter(struct event_command *cmd_ops, 2011 struct event_trigger_data *trigger_data); 2012 extern int event_trigger_register(struct event_command *cmd_ops, 2013 struct trace_event_file *file, 2014 char *glob, 2015 struct event_trigger_data *trigger_data); 2016 extern void event_trigger_unregister(struct event_command *cmd_ops, 2017 struct trace_event_file *file, 2018 char *glob, 2019 struct event_trigger_data *trigger_data); 2020 2021 extern void event_file_get(struct trace_event_file *file); 2022 extern void event_file_put(struct trace_event_file *file); 2023 2024 /** 2025 * struct event_command - callbacks and data members for event commands 2026 * 2027 * Event commands are invoked by users by writing the command name 2028 * into the 'trigger' file associated with a trace event. The 2029 * parameters associated with a specific invocation of an event 2030 * command are used to create an event trigger instance, which is 2031 * added to the list of trigger instances associated with that trace 2032 * event. When the event is hit, the set of triggers associated with 2033 * that event is invoked. 2034 * 2035 * The data members in this structure provide per-event command data 2036 * for various event commands. 2037 * 2038 * All the data members below, except for @post_trigger, must be set 2039 * for each event command. 2040 * 2041 * @name: The unique name that identifies the event command. This is 2042 * the name used when setting triggers via trigger files. 2043 * 2044 * @trigger_type: A unique id that identifies the event command 2045 * 'type'. This value has two purposes, the first to ensure that 2046 * only one trigger of the same type can be set at a given time 2047 * for a particular event e.g. it doesn't make sense to have both 2048 * a traceon and traceoff trigger attached to a single event at 2049 * the same time, so traceon and traceoff have the same type 2050 * though they have different names. The @trigger_type value is 2051 * also used as a bit value for deferring the actual trigger 2052 * action until after the current event is finished. Some 2053 * commands need to do this if they themselves log to the trace 2054 * buffer (see the @post_trigger() member below). @trigger_type 2055 * values are defined by adding new values to the trigger_type 2056 * enum in include/linux/trace_events.h. 2057 * 2058 * @flags: See the enum event_command_flags below. 2059 * 2060 * All the methods below, except for @set_filter() and @unreg_all(), 2061 * must be implemented. 2062 * 2063 * @parse: The callback function responsible for parsing and 2064 * registering the trigger written to the 'trigger' file by the 2065 * user. It allocates the trigger instance and registers it with 2066 * the appropriate trace event. It makes use of the other 2067 * event_command callback functions to orchestrate this, and is 2068 * usually implemented by the generic utility function 2069 * @event_trigger_callback() (see trace_event_triggers.c). 2070 * 2071 * @reg: Adds the trigger to the list of triggers associated with the 2072 * event, and enables the event trigger itself, after 2073 * initializing it (via the event_command @init() function). 2074 * This is also where commands can use the @trigger_type value to 2075 * make the decision as to whether or not multiple instances of 2076 * the trigger should be allowed. This is usually implemented by 2077 * the generic utility function @register_trigger() (see 2078 * trace_event_triggers.c). 2079 * 2080 * @unreg: Removes the trigger from the list of triggers associated 2081 * with the event, and disables the event trigger itself, after 2082 * initializing it (via the event_command @free() function). 2083 * This is usually implemented by the generic utility function 2084 * @unregister_trigger() (see trace_event_triggers.c). 2085 * 2086 * @unreg_all: An optional function called to remove all the triggers 2087 * from the list of triggers associated with the event. Called 2088 * when a trigger file is opened in truncate mode. 2089 * 2090 * @set_filter: An optional function called to parse and set a filter 2091 * for the trigger. If no @set_filter() method is set for the 2092 * event command, filters set by the user for the command will be 2093 * ignored. This is usually implemented by the generic utility 2094 * function @set_trigger_filter() (see trace_event_triggers.c). 2095 * 2096 * All the methods below, except for @init() and @free(), must be 2097 * implemented. 2098 * 2099 * @trigger: The trigger 'probe' function called when the triggering 2100 * event occurs. The data passed into this callback is the data 2101 * that was supplied to the event_command @reg() function that 2102 * registered the trigger (see struct event_command) along with 2103 * the trace record, rec. 2104 * 2105 * @count_func: If defined and a numeric parameter is passed to the 2106 * trigger, then this function will be called before @trigger 2107 * is called. If this function returns false, then @trigger is not 2108 * executed. 2109 * 2110 * @init: An optional initialization function called for the trigger 2111 * when the trigger is registered (via the event_command reg() 2112 * function). This can be used to perform per-trigger 2113 * initialization such as incrementing a per-trigger reference 2114 * count, for instance. This is usually implemented by the 2115 * generic utility function @event_trigger_init() (see 2116 * trace_event_triggers.c). 2117 * 2118 * @free: An optional de-initialization function called for the 2119 * trigger when the trigger is unregistered (via the 2120 * event_command @reg() function). This can be used to perform 2121 * per-trigger de-initialization such as decrementing a 2122 * per-trigger reference count and freeing corresponding trigger 2123 * data, for instance. This is usually implemented by the 2124 * generic utility function @event_trigger_free() (see 2125 * trace_event_triggers.c). 2126 * 2127 * @print: The callback function invoked to have the trigger print 2128 * itself. This is usually implemented by a wrapper function 2129 * that calls the generic utility function @event_trigger_print() 2130 * (see trace_event_triggers.c). 2131 */ 2132 struct event_command { 2133 struct list_head list; 2134 char *name; 2135 enum event_trigger_type trigger_type; 2136 int flags; 2137 int (*parse)(struct event_command *cmd_ops, 2138 struct trace_event_file *file, 2139 char *glob, char *cmd, 2140 char *param_and_filter); 2141 int (*reg)(char *glob, 2142 struct event_trigger_data *data, 2143 struct trace_event_file *file); 2144 void (*unreg)(char *glob, 2145 struct event_trigger_data *data, 2146 struct trace_event_file *file); 2147 void (*unreg_all)(struct trace_event_file *file); 2148 int (*set_filter)(char *filter_str, 2149 struct event_trigger_data *data, 2150 struct trace_event_file *file); 2151 void (*trigger)(struct event_trigger_data *data, 2152 struct trace_buffer *buffer, 2153 void *rec, 2154 struct ring_buffer_event *rbe); 2155 bool (*count_func)(struct event_trigger_data *data, 2156 struct trace_buffer *buffer, 2157 void *rec, 2158 struct ring_buffer_event *rbe); 2159 int (*init)(struct event_trigger_data *data); 2160 void (*free)(struct event_trigger_data *data); 2161 int (*print)(struct seq_file *m, 2162 struct event_trigger_data *data); 2163 }; 2164 2165 /** 2166 * enum event_command_flags - flags for struct event_command 2167 * 2168 * @POST_TRIGGER: A flag that says whether or not this command needs 2169 * to have its action delayed until after the current event has 2170 * been closed. Some triggers need to avoid being invoked while 2171 * an event is currently in the process of being logged, since 2172 * the trigger may itself log data into the trace buffer. Thus 2173 * we make sure the current event is committed before invoking 2174 * those triggers. To do that, the trigger invocation is split 2175 * in two - the first part checks the filter using the current 2176 * trace record; if a command has the @post_trigger flag set, it 2177 * sets a bit for itself in the return value, otherwise it 2178 * directly invokes the trigger. Once all commands have been 2179 * either invoked or set their return flag, the current record is 2180 * either committed or discarded. At that point, if any commands 2181 * have deferred their triggers, those commands are finally 2182 * invoked following the close of the current event. In other 2183 * words, if the event_command @func() probe implementation 2184 * itself logs to the trace buffer, this flag should be set, 2185 * otherwise it can be left unspecified. 2186 * 2187 * @NEEDS_REC: A flag that says whether or not this command needs 2188 * access to the trace record in order to perform its function, 2189 * regardless of whether or not it has a filter associated with 2190 * it (filters make a trigger require access to the trace record 2191 * but are not always present). 2192 */ 2193 enum event_command_flags { 2194 EVENT_CMD_FL_POST_TRIGGER = 1, 2195 EVENT_CMD_FL_NEEDS_REC = 2, 2196 }; 2197 2198 static inline bool event_command_post_trigger(struct event_command *cmd_ops) 2199 { 2200 return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; 2201 } 2202 2203 static inline bool event_command_needs_rec(struct event_command *cmd_ops) 2204 { 2205 return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; 2206 } 2207 2208 extern int trace_event_enable_disable(struct trace_event_file *file, 2209 int enable, int soft_disable); 2210 2211 extern const char *__start___trace_bprintk_fmt[]; 2212 extern const char *__stop___trace_bprintk_fmt[]; 2213 2214 extern const char *__start___tracepoint_str[]; 2215 extern const char *__stop___tracepoint_str[]; 2216 2217 void trace_printk_control(bool enabled); 2218 void trace_printk_start_comm(void); 2219 void trace_printk_start_stop_comm(int enabled); 2220 int trace_keep_overwrite(struct tracer *tracer, u64 mask, int set); 2221 int set_tracer_flag(struct trace_array *tr, u64 mask, int enabled); 2222 2223 /* Used from boot time tracer */ 2224 extern int trace_set_options(struct trace_array *tr, char *option); 2225 extern int tracing_set_tracer(struct trace_array *tr, const char *buf); 2226 extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr, 2227 unsigned long size, int cpu_id); 2228 extern int tracing_set_cpumask(struct trace_array *tr, 2229 cpumask_var_t tracing_cpumask_new); 2230 2231 2232 #define MAX_EVENT_NAME_LEN 64 2233 2234 extern ssize_t trace_parse_run_command(struct file *file, 2235 const char __user *buffer, size_t count, loff_t *ppos, 2236 int (*createfn)(const char *)); 2237 2238 extern unsigned int err_pos(char *cmd, const char *str); 2239 extern void tracing_log_err(struct trace_array *tr, 2240 const char *loc, const char *cmd, 2241 const char **errs, u8 type, u16 pos); 2242 2243 /* 2244 * Normal trace_printk() and friends allocates special buffers 2245 * to do the manipulation, as well as saves the print formats 2246 * into sections to display. But the trace infrastructure wants 2247 * to use these without the added overhead at the price of being 2248 * a bit slower (used mainly for warnings, where we don't care 2249 * about performance). The internal_trace_puts() is for such 2250 * a purpose. 2251 */ 2252 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str) 2253 2254 #undef FTRACE_ENTRY 2255 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ 2256 extern struct trace_event_call \ 2257 __aligned(4) event_##call; 2258 #undef FTRACE_ENTRY_DUP 2259 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ 2260 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 2261 #undef FTRACE_ENTRY_PACKED 2262 #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \ 2263 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) 2264 2265 #include "trace_entries.h" 2266 2267 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 2268 int perf_ftrace_event_register(struct trace_event_call *call, 2269 enum trace_reg type, void *data); 2270 #else 2271 #define perf_ftrace_event_register NULL 2272 #endif 2273 2274 #ifdef CONFIG_FTRACE_SYSCALLS 2275 void init_ftrace_syscalls(void); 2276 const char *get_syscall_name(int syscall); 2277 #else 2278 static inline void init_ftrace_syscalls(void) { } 2279 static inline const char *get_syscall_name(int syscall) 2280 { 2281 return NULL; 2282 } 2283 #endif 2284 2285 #ifdef CONFIG_EVENT_TRACING 2286 void trace_event_init(void); 2287 void trace_event_update_all(struct trace_eval_map **map, int len); 2288 /* Used from boot time tracer */ 2289 extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); 2290 extern int trigger_process_regex(struct trace_event_file *file, char *buff); 2291 #else 2292 static inline void __init trace_event_init(void) { } 2293 static inline void trace_event_update_all(struct trace_eval_map **map, int len) { } 2294 #endif 2295 2296 #ifdef CONFIG_TRACER_SNAPSHOT 2297 extern const struct file_operations snapshot_fops; 2298 extern const struct file_operations snapshot_raw_fops; 2299 2300 /* Used when creating instances */ 2301 int trace_allocate_snapshot(struct trace_array *tr, int size); 2302 2303 int tracing_alloc_snapshot(void); 2304 void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); 2305 int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); 2306 int tracing_snapshot_cond_disable(struct trace_array *tr); 2307 void *tracing_cond_snapshot_data(struct trace_array *tr); 2308 void tracing_snapshot_instance(struct trace_array *tr); 2309 int tracing_alloc_snapshot_instance(struct trace_array *tr); 2310 int tracing_arm_snapshot_locked(struct trace_array *tr); 2311 int tracing_arm_snapshot(struct trace_array *tr); 2312 void tracing_disarm_snapshot(struct trace_array *tr); 2313 void free_snapshot(struct trace_array *tr); 2314 void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter); 2315 int get_snapshot_map(struct trace_array *tr); 2316 void put_snapshot_map(struct trace_array *tr); 2317 int resize_buffer_duplicate_size(struct array_buffer *trace_buf, 2318 struct array_buffer *size_buf, int cpu_id); 2319 __init void do_allocate_snapshot(const char *name); 2320 # ifdef CONFIG_DYNAMIC_FTRACE 2321 __init int register_snapshot_cmd(void); 2322 # else 2323 static inline int register_snapshot_cmd(void) { return 0; } 2324 # endif 2325 #else /* !CONFIG_TRACER_SNAPSHOT */ 2326 static inline int trace_allocate_snapshot(struct trace_array *tr, int size) { return 0; } 2327 static inline void tracing_snapshot_instance(struct trace_array *tr) { } 2328 static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) 2329 { 2330 return 0; 2331 } 2332 static inline int tracing_arm_snapshot_locked(struct trace_array *tr) { return -EBUSY; } 2333 static inline int tracing_arm_snapshot(struct trace_array *tr) { return 0; } 2334 static inline void tracing_disarm_snapshot(struct trace_array *tr) { } 2335 static inline void free_snapshot(struct trace_array *tr) {} 2336 static inline void tracing_snapshot_cond(struct trace_array *tr, void *cond_data) 2337 { 2338 WARN_ONCE(1, "Snapshot feature not enabled, but internal conditional snapshot used"); 2339 } 2340 static inline void *tracing_cond_snapshot_data(struct trace_array *tr) 2341 { 2342 return NULL; 2343 } 2344 static inline int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update) 2345 { 2346 return -ENODEV; 2347 } 2348 static inline int tracing_snapshot_cond_disable(struct trace_array *tr) 2349 { 2350 return false; 2351 } 2352 static inline void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) 2353 { 2354 /* Should never be called */ 2355 WARN_ONCE(1, "Snapshot print function called without snapshot configured"); 2356 } 2357 static inline int get_snapshot_map(struct trace_array *tr) { return 0; } 2358 static inline void put_snapshot_map(struct trace_array *tr) { } 2359 static inline void do_allocate_snapshot(const char *name) { } 2360 static inline int register_snapshot_cmd(void) { return 0; } 2361 #endif /* CONFIG_TRACER_SNAPSHOT */ 2362 2363 #ifdef CONFIG_PREEMPT_TRACER 2364 void tracer_preempt_on(unsigned long a0, unsigned long a1); 2365 void tracer_preempt_off(unsigned long a0, unsigned long a1); 2366 #else 2367 static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } 2368 static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } 2369 #endif 2370 #ifdef CONFIG_IRQSOFF_TRACER 2371 void tracer_hardirqs_on(unsigned long a0, unsigned long a1); 2372 void tracer_hardirqs_off(unsigned long a0, unsigned long a1); 2373 #else 2374 static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } 2375 static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } 2376 #endif 2377 2378 /* 2379 * Reset the state of the trace_iterator so that it can read consumed data. 2380 * Normally, the trace_iterator is used for reading the data when it is not 2381 * consumed, and must retain state. 2382 */ 2383 static __always_inline void trace_iterator_reset(struct trace_iterator *iter) 2384 { 2385 memset_startat(iter, 0, seq); 2386 iter->pos = -1; 2387 } 2388 2389 /* Check the name is good for event/group/fields */ 2390 static inline bool __is_good_name(const char *name, bool hash_ok) 2391 { 2392 if (!isalpha(*name) && *name != '_' && (!hash_ok || *name != '-')) 2393 return false; 2394 while (*++name != '\0') { 2395 if (!isalpha(*name) && !isdigit(*name) && *name != '_' && 2396 (!hash_ok || *name != '-')) 2397 return false; 2398 } 2399 return true; 2400 } 2401 2402 /* Check the name is good for event/group/fields */ 2403 static inline bool is_good_name(const char *name) 2404 { 2405 return __is_good_name(name, false); 2406 } 2407 2408 /* Check the name is good for system */ 2409 static inline bool is_good_system_name(const char *name) 2410 { 2411 return __is_good_name(name, true); 2412 } 2413 2414 /* Convert certain expected symbols into '_' when generating event names */ 2415 static inline void sanitize_event_name(char *name) 2416 { 2417 while (*name++ != '\0') 2418 if (*name == ':' || *name == '.' || *name == '*') 2419 *name = '_'; 2420 } 2421 2422 #ifdef CONFIG_STACKTRACE 2423 void __ftrace_trace_stack(struct trace_array *tr, 2424 struct trace_buffer *buffer, 2425 unsigned int trace_ctx, 2426 int skip, struct pt_regs *regs); 2427 2428 static __always_inline void ftrace_trace_stack(struct trace_array *tr, 2429 struct trace_buffer *buffer, 2430 unsigned int trace_ctx, 2431 int skip, struct pt_regs *regs) 2432 { 2433 if (!(tr->trace_flags & TRACE_ITER(STACKTRACE))) 2434 return; 2435 2436 __ftrace_trace_stack(tr, buffer, trace_ctx, skip, regs); 2437 } 2438 #else 2439 static inline void __ftrace_trace_stack(struct trace_array *tr, 2440 struct trace_buffer *buffer, 2441 unsigned int trace_ctx, 2442 int skip, struct pt_regs *regs) 2443 { 2444 } 2445 static inline void ftrace_trace_stack(struct trace_array *tr, 2446 struct trace_buffer *buffer, 2447 unsigned long trace_ctx, 2448 int skip, struct pt_regs *regs) 2449 { 2450 } 2451 #endif 2452 2453 /* 2454 * This is a generic way to read and write a u64 value from a file in tracefs. 2455 * 2456 * The value is stored on the variable pointed by *val. The value needs 2457 * to be at least *min and at most *max. The write is protected by an 2458 * existing *lock. 2459 */ 2460 struct trace_min_max_param { 2461 struct mutex *lock; 2462 u64 *val; 2463 u64 *min; 2464 u64 *max; 2465 }; 2466 2467 #define U64_STR_SIZE 24 /* 20 digits max */ 2468 2469 extern const struct file_operations trace_min_max_fops; 2470 2471 #ifdef CONFIG_RV 2472 extern int rv_init_interface(void); 2473 #else 2474 static inline int rv_init_interface(void) 2475 { 2476 return 0; 2477 } 2478 #endif 2479 2480 /* 2481 * This is used only to distinguish 2482 * function address from trampoline code. 2483 * So this value has no meaning. 2484 */ 2485 #define FTRACE_TRAMPOLINE_MARKER ((unsigned long) INT_MAX) 2486 2487 /* 2488 * This is used to get the address of the args array based on 2489 * the type of the entry. 2490 */ 2491 #define FGRAPH_ENTRY_ARGS(e) \ 2492 ({ \ 2493 unsigned long *_args; \ 2494 struct ftrace_graph_ent_entry *_e = e; \ 2495 \ 2496 if (IS_ENABLED(CONFIG_FUNCTION_GRAPH_RETADDR) && \ 2497 e->ent.type == TRACE_GRAPH_RETADDR_ENT) { \ 2498 struct fgraph_retaddr_ent_entry *_re; \ 2499 \ 2500 _re = (typeof(_re))_e; \ 2501 _args = _re->args; \ 2502 } else { \ 2503 _args = _e->args; \ 2504 } \ 2505 _args; \ 2506 }) 2507 2508 #endif /* _LINUX_KERNEL_TRACE_H */ 2509