1 #ifndef _LINUX_KERNEL_TRACE_H 2 #define _LINUX_KERNEL_TRACE_H 3 4 #include <linux/fs.h> 5 #include <linux/atomic.h> 6 #include <linux/sched.h> 7 #include <linux/clocksource.h> 8 #include <linux/ring_buffer.h> 9 #include <linux/mmiotrace.h> 10 #include <linux/tracepoint.h> 11 #include <linux/ftrace.h> 12 #include <linux/hw_breakpoint.h> 13 #include <linux/trace_seq.h> 14 #include <linux/ftrace_event.h> 15 16 #ifdef CONFIG_FTRACE_SYSCALLS 17 #include <asm/unistd.h> /* For NR_SYSCALLS */ 18 #include <asm/syscall.h> /* some archs define it here */ 19 #endif 20 21 enum trace_type { 22 __TRACE_FIRST_TYPE = 0, 23 24 TRACE_FN, 25 TRACE_CTX, 26 TRACE_WAKE, 27 TRACE_STACK, 28 TRACE_PRINT, 29 TRACE_BPRINT, 30 TRACE_MMIO_RW, 31 TRACE_MMIO_MAP, 32 TRACE_BRANCH, 33 TRACE_GRAPH_RET, 34 TRACE_GRAPH_ENT, 35 TRACE_USER_STACK, 36 TRACE_BLK, 37 TRACE_BPUTS, 38 39 __TRACE_LAST_TYPE, 40 }; 41 42 43 #undef __field 44 #define __field(type, item) type item; 45 46 #undef __field_struct 47 #define __field_struct(type, item) __field(type, item) 48 49 #undef __field_desc 50 #define __field_desc(type, container, item) 51 52 #undef __array 53 #define __array(type, item, size) type item[size]; 54 55 #undef __array_desc 56 #define __array_desc(type, container, item, size) 57 58 #undef __dynamic_array 59 #define __dynamic_array(type, item) type item[]; 60 61 #undef F_STRUCT 62 #define F_STRUCT(args...) args 63 64 #undef FTRACE_ENTRY 65 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 66 struct struct_name { \ 67 struct trace_entry ent; \ 68 tstruct \ 69 } 70 71 #undef TP_ARGS 72 #define TP_ARGS(args...) args 73 74 #undef FTRACE_ENTRY_DUP 75 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) 76 77 #undef FTRACE_ENTRY_REG 78 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 79 filter, regfn) \ 80 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 81 filter) 82 83 #include "trace_entries.h" 84 85 /* 86 * syscalls are special, and need special handling, this is why 87 * they are not included in trace_entries.h 88 */ 89 struct syscall_trace_enter { 90 struct trace_entry ent; 91 int nr; 92 unsigned long args[]; 93 }; 94 95 struct syscall_trace_exit { 96 struct trace_entry ent; 97 int nr; 98 long ret; 99 }; 100 101 struct kprobe_trace_entry_head { 102 struct trace_entry ent; 103 unsigned long ip; 104 }; 105 106 struct kretprobe_trace_entry_head { 107 struct trace_entry ent; 108 unsigned long func; 109 unsigned long ret_ip; 110 }; 111 112 /* 113 * trace_flag_type is an enumeration that holds different 114 * states when a trace occurs. These are: 115 * IRQS_OFF - interrupts were disabled 116 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 117 * NEED_RESCHED - reschedule is requested 118 * HARDIRQ - inside an interrupt handler 119 * SOFTIRQ - inside a softirq handler 120 */ 121 enum trace_flag_type { 122 TRACE_FLAG_IRQS_OFF = 0x01, 123 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 124 TRACE_FLAG_NEED_RESCHED = 0x04, 125 TRACE_FLAG_HARDIRQ = 0x08, 126 TRACE_FLAG_SOFTIRQ = 0x10, 127 TRACE_FLAG_PREEMPT_RESCHED = 0x20, 128 }; 129 130 #define TRACE_BUF_SIZE 1024 131 132 struct trace_array; 133 134 /* 135 * The CPU trace array - it consists of thousands of trace entries 136 * plus some other descriptor data: (for example which task started 137 * the trace, etc.) 138 */ 139 struct trace_array_cpu { 140 atomic_t disabled; 141 void *buffer_page; /* ring buffer spare */ 142 143 unsigned long entries; 144 unsigned long saved_latency; 145 unsigned long critical_start; 146 unsigned long critical_end; 147 unsigned long critical_sequence; 148 unsigned long nice; 149 unsigned long policy; 150 unsigned long rt_priority; 151 unsigned long skipped_entries; 152 cycle_t preempt_timestamp; 153 pid_t pid; 154 kuid_t uid; 155 char comm[TASK_COMM_LEN]; 156 }; 157 158 struct tracer; 159 160 struct trace_buffer { 161 struct trace_array *tr; 162 struct ring_buffer *buffer; 163 struct trace_array_cpu __percpu *data; 164 cycle_t time_start; 165 int cpu; 166 }; 167 168 /* 169 * The trace array - an array of per-CPU trace arrays. This is the 170 * highest level data structure that individual tracers deal with. 171 * They have on/off state as well: 172 */ 173 struct trace_array { 174 struct list_head list; 175 char *name; 176 struct trace_buffer trace_buffer; 177 #ifdef CONFIG_TRACER_MAX_TRACE 178 /* 179 * The max_buffer is used to snapshot the trace when a maximum 180 * latency is reached, or when the user initiates a snapshot. 181 * Some tracers will use this to store a maximum trace while 182 * it continues examining live traces. 183 * 184 * The buffers for the max_buffer are set up the same as the trace_buffer 185 * When a snapshot is taken, the buffer of the max_buffer is swapped 186 * with the buffer of the trace_buffer and the buffers are reset for 187 * the trace_buffer so the tracing can continue. 188 */ 189 struct trace_buffer max_buffer; 190 bool allocated_snapshot; 191 #endif 192 int buffer_disabled; 193 #ifdef CONFIG_FTRACE_SYSCALLS 194 int sys_refcount_enter; 195 int sys_refcount_exit; 196 DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls); 197 DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls); 198 #endif 199 int stop_count; 200 int clock_id; 201 struct tracer *current_trace; 202 unsigned int flags; 203 raw_spinlock_t start_lock; 204 struct dentry *dir; 205 struct dentry *options; 206 struct dentry *percpu_dir; 207 struct dentry *event_dir; 208 struct list_head systems; 209 struct list_head events; 210 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 211 int ref; 212 }; 213 214 enum { 215 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 216 }; 217 218 extern struct list_head ftrace_trace_arrays; 219 220 extern struct mutex trace_types_lock; 221 222 extern int trace_array_get(struct trace_array *tr); 223 extern void trace_array_put(struct trace_array *tr); 224 225 /* 226 * The global tracer (top) should be the first trace array added, 227 * but we check the flag anyway. 228 */ 229 static inline struct trace_array *top_trace_array(void) 230 { 231 struct trace_array *tr; 232 233 tr = list_entry(ftrace_trace_arrays.prev, 234 typeof(*tr), list); 235 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 236 return tr; 237 } 238 239 #define FTRACE_CMP_TYPE(var, type) \ 240 __builtin_types_compatible_p(typeof(var), type *) 241 242 #undef IF_ASSIGN 243 #define IF_ASSIGN(var, entry, etype, id) \ 244 if (FTRACE_CMP_TYPE(var, etype)) { \ 245 var = (typeof(var))(entry); \ 246 WARN_ON(id && (entry)->type != id); \ 247 break; \ 248 } 249 250 /* Will cause compile errors if type is not found. */ 251 extern void __ftrace_bad_type(void); 252 253 /* 254 * The trace_assign_type is a verifier that the entry type is 255 * the same as the type being assigned. To add new types simply 256 * add a line with the following format: 257 * 258 * IF_ASSIGN(var, ent, type, id); 259 * 260 * Where "type" is the trace type that includes the trace_entry 261 * as the "ent" item. And "id" is the trace identifier that is 262 * used in the trace_type enum. 263 * 264 * If the type can have more than one id, then use zero. 265 */ 266 #define trace_assign_type(var, ent) \ 267 do { \ 268 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 269 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 270 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 271 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 272 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 273 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 274 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 275 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 276 TRACE_MMIO_RW); \ 277 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 278 TRACE_MMIO_MAP); \ 279 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 280 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 281 TRACE_GRAPH_ENT); \ 282 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 283 TRACE_GRAPH_RET); \ 284 __ftrace_bad_type(); \ 285 } while (0) 286 287 /* 288 * An option specific to a tracer. This is a boolean value. 289 * The bit is the bit index that sets its value on the 290 * flags value in struct tracer_flags. 291 */ 292 struct tracer_opt { 293 const char *name; /* Will appear on the trace_options file */ 294 u32 bit; /* Mask assigned in val field in tracer_flags */ 295 }; 296 297 /* 298 * The set of specific options for a tracer. Your tracer 299 * have to set the initial value of the flags val. 300 */ 301 struct tracer_flags { 302 u32 val; 303 struct tracer_opt *opts; 304 }; 305 306 /* Makes more easy to define a tracer opt */ 307 #define TRACER_OPT(s, b) .name = #s, .bit = b 308 309 310 /** 311 * struct tracer - a specific tracer and its callbacks to interact with debugfs 312 * @name: the name chosen to select it on the available_tracers file 313 * @init: called when one switches to this tracer (echo name > current_tracer) 314 * @reset: called when one switches to another tracer 315 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 316 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 317 * @open: called when the trace file is opened 318 * @pipe_open: called when the trace_pipe file is opened 319 * @wait_pipe: override how the user waits for traces on trace_pipe 320 * @close: called when the trace file is released 321 * @pipe_close: called when the trace_pipe file is released 322 * @read: override the default read callback on trace_pipe 323 * @splice_read: override the default splice_read callback on trace_pipe 324 * @selftest: selftest to run on boot (see trace_selftest.c) 325 * @print_headers: override the first lines that describe your columns 326 * @print_line: callback that prints a trace 327 * @set_flag: signals one of your private flags changed (trace_options file) 328 * @flags: your private flags 329 */ 330 struct tracer { 331 const char *name; 332 int (*init)(struct trace_array *tr); 333 void (*reset)(struct trace_array *tr); 334 void (*start)(struct trace_array *tr); 335 void (*stop)(struct trace_array *tr); 336 void (*open)(struct trace_iterator *iter); 337 void (*pipe_open)(struct trace_iterator *iter); 338 void (*wait_pipe)(struct trace_iterator *iter); 339 void (*close)(struct trace_iterator *iter); 340 void (*pipe_close)(struct trace_iterator *iter); 341 ssize_t (*read)(struct trace_iterator *iter, 342 struct file *filp, char __user *ubuf, 343 size_t cnt, loff_t *ppos); 344 ssize_t (*splice_read)(struct trace_iterator *iter, 345 struct file *filp, 346 loff_t *ppos, 347 struct pipe_inode_info *pipe, 348 size_t len, 349 unsigned int flags); 350 #ifdef CONFIG_FTRACE_STARTUP_TEST 351 int (*selftest)(struct tracer *trace, 352 struct trace_array *tr); 353 #endif 354 void (*print_header)(struct seq_file *m); 355 enum print_line_t (*print_line)(struct trace_iterator *iter); 356 /* If you handled the flag setting, return 0 */ 357 int (*set_flag)(u32 old_flags, u32 bit, int set); 358 /* Return 0 if OK with change, else return non-zero */ 359 int (*flag_changed)(struct tracer *tracer, 360 u32 mask, int set); 361 struct tracer *next; 362 struct tracer_flags *flags; 363 bool print_max; 364 bool enabled; 365 #ifdef CONFIG_TRACER_MAX_TRACE 366 bool use_max_tr; 367 #endif 368 }; 369 370 371 /* Only current can touch trace_recursion */ 372 373 /* 374 * For function tracing recursion: 375 * The order of these bits are important. 376 * 377 * When function tracing occurs, the following steps are made: 378 * If arch does not support a ftrace feature: 379 * call internal function (uses INTERNAL bits) which calls... 380 * If callback is registered to the "global" list, the list 381 * function is called and recursion checks the GLOBAL bits. 382 * then this function calls... 383 * The function callback, which can use the FTRACE bits to 384 * check for recursion. 385 * 386 * Now if the arch does not suppport a feature, and it calls 387 * the global list function which calls the ftrace callback 388 * all three of these steps will do a recursion protection. 389 * There's no reason to do one if the previous caller already 390 * did. The recursion that we are protecting against will 391 * go through the same steps again. 392 * 393 * To prevent the multiple recursion checks, if a recursion 394 * bit is set that is higher than the MAX bit of the current 395 * check, then we know that the check was made by the previous 396 * caller, and we can skip the current check. 397 */ 398 enum { 399 TRACE_BUFFER_BIT, 400 TRACE_BUFFER_NMI_BIT, 401 TRACE_BUFFER_IRQ_BIT, 402 TRACE_BUFFER_SIRQ_BIT, 403 404 /* Start of function recursion bits */ 405 TRACE_FTRACE_BIT, 406 TRACE_FTRACE_NMI_BIT, 407 TRACE_FTRACE_IRQ_BIT, 408 TRACE_FTRACE_SIRQ_BIT, 409 410 /* GLOBAL_BITs must be greater than FTRACE_BITs */ 411 TRACE_GLOBAL_BIT, 412 TRACE_GLOBAL_NMI_BIT, 413 TRACE_GLOBAL_IRQ_BIT, 414 TRACE_GLOBAL_SIRQ_BIT, 415 416 /* INTERNAL_BITs must be greater than GLOBAL_BITs */ 417 TRACE_INTERNAL_BIT, 418 TRACE_INTERNAL_NMI_BIT, 419 TRACE_INTERNAL_IRQ_BIT, 420 TRACE_INTERNAL_SIRQ_BIT, 421 422 TRACE_CONTROL_BIT, 423 424 /* 425 * Abuse of the trace_recursion. 426 * As we need a way to maintain state if we are tracing the function 427 * graph in irq because we want to trace a particular function that 428 * was called in irq context but we have irq tracing off. Since this 429 * can only be modified by current, we can reuse trace_recursion. 430 */ 431 TRACE_IRQ_BIT, 432 }; 433 434 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 435 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 436 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 437 438 #define TRACE_CONTEXT_BITS 4 439 440 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 441 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 442 443 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT 444 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1) 445 446 #define TRACE_LIST_START TRACE_INTERNAL_BIT 447 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 448 449 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 450 451 static __always_inline int trace_get_context_bit(void) 452 { 453 int bit; 454 455 if (in_interrupt()) { 456 if (in_nmi()) 457 bit = 0; 458 459 else if (in_irq()) 460 bit = 1; 461 else 462 bit = 2; 463 } else 464 bit = 3; 465 466 return bit; 467 } 468 469 static __always_inline int trace_test_and_set_recursion(int start, int max) 470 { 471 unsigned int val = current->trace_recursion; 472 int bit; 473 474 /* A previous recursion check was made */ 475 if ((val & TRACE_CONTEXT_MASK) > max) 476 return 0; 477 478 bit = trace_get_context_bit() + start; 479 if (unlikely(val & (1 << bit))) 480 return -1; 481 482 val |= 1 << bit; 483 current->trace_recursion = val; 484 barrier(); 485 486 return bit; 487 } 488 489 static __always_inline void trace_clear_recursion(int bit) 490 { 491 unsigned int val = current->trace_recursion; 492 493 if (!bit) 494 return; 495 496 bit = 1 << bit; 497 val &= ~bit; 498 499 barrier(); 500 current->trace_recursion = val; 501 } 502 503 static inline struct ring_buffer_iter * 504 trace_buffer_iter(struct trace_iterator *iter, int cpu) 505 { 506 if (iter->buffer_iter && iter->buffer_iter[cpu]) 507 return iter->buffer_iter[cpu]; 508 return NULL; 509 } 510 511 int tracer_init(struct tracer *t, struct trace_array *tr); 512 int tracing_is_enabled(void); 513 void tracing_reset(struct trace_buffer *buf, int cpu); 514 void tracing_reset_online_cpus(struct trace_buffer *buf); 515 void tracing_reset_current(int cpu); 516 void tracing_reset_all_online_cpus(void); 517 int tracing_open_generic(struct inode *inode, struct file *filp); 518 struct dentry *trace_create_file(const char *name, 519 umode_t mode, 520 struct dentry *parent, 521 void *data, 522 const struct file_operations *fops); 523 524 struct dentry *tracing_init_dentry_tr(struct trace_array *tr); 525 struct dentry *tracing_init_dentry(void); 526 527 struct ring_buffer_event; 528 529 struct ring_buffer_event * 530 trace_buffer_lock_reserve(struct ring_buffer *buffer, 531 int type, 532 unsigned long len, 533 unsigned long flags, 534 int pc); 535 536 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 537 struct trace_array_cpu *data); 538 539 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 540 int *ent_cpu, u64 *ent_ts); 541 542 void __buffer_unlock_commit(struct ring_buffer *buffer, 543 struct ring_buffer_event *event); 544 545 int trace_empty(struct trace_iterator *iter); 546 547 void *trace_find_next_entry_inc(struct trace_iterator *iter); 548 549 void trace_init_global_iter(struct trace_iterator *iter); 550 551 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 552 553 void poll_wait_pipe(struct trace_iterator *iter); 554 555 void tracing_sched_switch_trace(struct trace_array *tr, 556 struct task_struct *prev, 557 struct task_struct *next, 558 unsigned long flags, int pc); 559 560 void tracing_sched_wakeup_trace(struct trace_array *tr, 561 struct task_struct *wakee, 562 struct task_struct *cur, 563 unsigned long flags, int pc); 564 void trace_function(struct trace_array *tr, 565 unsigned long ip, 566 unsigned long parent_ip, 567 unsigned long flags, int pc); 568 void trace_graph_function(struct trace_array *tr, 569 unsigned long ip, 570 unsigned long parent_ip, 571 unsigned long flags, int pc); 572 void trace_latency_header(struct seq_file *m); 573 void trace_default_header(struct seq_file *m); 574 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 575 int trace_empty(struct trace_iterator *iter); 576 577 void trace_graph_return(struct ftrace_graph_ret *trace); 578 int trace_graph_entry(struct ftrace_graph_ent *trace); 579 void set_graph_array(struct trace_array *tr); 580 581 void tracing_start_cmdline_record(void); 582 void tracing_stop_cmdline_record(void); 583 void tracing_sched_switch_assign_trace(struct trace_array *tr); 584 void tracing_stop_sched_switch_record(void); 585 void tracing_start_sched_switch_record(void); 586 int register_tracer(struct tracer *type); 587 int is_tracing_stopped(void); 588 589 extern cpumask_var_t __read_mostly tracing_buffer_mask; 590 591 #define for_each_tracing_cpu(cpu) \ 592 for_each_cpu(cpu, tracing_buffer_mask) 593 594 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 595 596 extern unsigned long tracing_thresh; 597 598 #ifdef CONFIG_TRACER_MAX_TRACE 599 extern unsigned long tracing_max_latency; 600 601 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 602 void update_max_tr_single(struct trace_array *tr, 603 struct task_struct *tsk, int cpu); 604 #endif /* CONFIG_TRACER_MAX_TRACE */ 605 606 #ifdef CONFIG_STACKTRACE 607 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 608 int skip, int pc); 609 610 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, 611 int skip, int pc, struct pt_regs *regs); 612 613 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 614 int pc); 615 616 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 617 int pc); 618 #else 619 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 620 unsigned long flags, int skip, int pc) 621 { 622 } 623 624 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, 625 unsigned long flags, int skip, 626 int pc, struct pt_regs *regs) 627 { 628 } 629 630 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 631 unsigned long flags, int pc) 632 { 633 } 634 635 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 636 int skip, int pc) 637 { 638 } 639 #endif /* CONFIG_STACKTRACE */ 640 641 extern cycle_t ftrace_now(int cpu); 642 643 extern void trace_find_cmdline(int pid, char comm[]); 644 645 #ifdef CONFIG_DYNAMIC_FTRACE 646 extern unsigned long ftrace_update_tot_cnt; 647 #endif 648 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 649 extern int DYN_FTRACE_TEST_NAME(void); 650 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 651 extern int DYN_FTRACE_TEST_NAME2(void); 652 653 extern bool ring_buffer_expanded; 654 extern bool tracing_selftest_disabled; 655 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 656 657 #ifdef CONFIG_FTRACE_STARTUP_TEST 658 extern int trace_selftest_startup_function(struct tracer *trace, 659 struct trace_array *tr); 660 extern int trace_selftest_startup_function_graph(struct tracer *trace, 661 struct trace_array *tr); 662 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 663 struct trace_array *tr); 664 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 665 struct trace_array *tr); 666 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 667 struct trace_array *tr); 668 extern int trace_selftest_startup_wakeup(struct tracer *trace, 669 struct trace_array *tr); 670 extern int trace_selftest_startup_nop(struct tracer *trace, 671 struct trace_array *tr); 672 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 673 struct trace_array *tr); 674 extern int trace_selftest_startup_branch(struct tracer *trace, 675 struct trace_array *tr); 676 /* 677 * Tracer data references selftest functions that only occur 678 * on boot up. These can be __init functions. Thus, when selftests 679 * are enabled, then the tracers need to reference __init functions. 680 */ 681 #define __tracer_data __refdata 682 #else 683 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 684 #define __tracer_data __read_mostly 685 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 686 687 extern void *head_page(struct trace_array_cpu *data); 688 extern unsigned long long ns2usecs(cycle_t nsec); 689 extern int 690 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 691 extern int 692 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 693 extern int 694 trace_array_vprintk(struct trace_array *tr, 695 unsigned long ip, const char *fmt, va_list args); 696 int trace_array_printk(struct trace_array *tr, 697 unsigned long ip, const char *fmt, ...); 698 int trace_array_printk_buf(struct ring_buffer *buffer, 699 unsigned long ip, const char *fmt, ...); 700 void trace_printk_seq(struct trace_seq *s); 701 enum print_line_t print_trace_line(struct trace_iterator *iter); 702 703 extern unsigned long trace_flags; 704 705 /* Standard output formatting function used for function return traces */ 706 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 707 708 /* Flag options */ 709 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 710 #define TRACE_GRAPH_PRINT_CPU 0x2 711 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 712 #define TRACE_GRAPH_PRINT_PROC 0x8 713 #define TRACE_GRAPH_PRINT_DURATION 0x10 714 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 715 716 extern enum print_line_t 717 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 718 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 719 extern enum print_line_t 720 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 721 extern void graph_trace_open(struct trace_iterator *iter); 722 extern void graph_trace_close(struct trace_iterator *iter); 723 extern int __trace_graph_entry(struct trace_array *tr, 724 struct ftrace_graph_ent *trace, 725 unsigned long flags, int pc); 726 extern void __trace_graph_return(struct trace_array *tr, 727 struct ftrace_graph_ret *trace, 728 unsigned long flags, int pc); 729 730 731 #ifdef CONFIG_DYNAMIC_FTRACE 732 /* TODO: make this variable */ 733 #define FTRACE_GRAPH_MAX_FUNCS 32 734 extern int ftrace_graph_filter_enabled; 735 extern int ftrace_graph_count; 736 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 737 738 static inline int ftrace_graph_addr(unsigned long addr) 739 { 740 int i; 741 742 if (!ftrace_graph_filter_enabled) 743 return 1; 744 745 for (i = 0; i < ftrace_graph_count; i++) { 746 if (addr == ftrace_graph_funcs[i]) { 747 /* 748 * If no irqs are to be traced, but a set_graph_function 749 * is set, and called by an interrupt handler, we still 750 * want to trace it. 751 */ 752 if (in_irq()) 753 trace_recursion_set(TRACE_IRQ_BIT); 754 else 755 trace_recursion_clear(TRACE_IRQ_BIT); 756 return 1; 757 } 758 } 759 760 return 0; 761 } 762 #else 763 static inline int ftrace_graph_addr(unsigned long addr) 764 { 765 return 1; 766 } 767 #endif /* CONFIG_DYNAMIC_FTRACE */ 768 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 769 static inline enum print_line_t 770 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 771 { 772 return TRACE_TYPE_UNHANDLED; 773 } 774 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 775 776 extern struct list_head ftrace_pids; 777 778 #ifdef CONFIG_FUNCTION_TRACER 779 extern bool ftrace_filter_param __initdata; 780 static inline int ftrace_trace_task(struct task_struct *task) 781 { 782 if (list_empty(&ftrace_pids)) 783 return 1; 784 785 return test_tsk_trace_trace(task); 786 } 787 extern int ftrace_is_dead(void); 788 #else 789 static inline int ftrace_trace_task(struct task_struct *task) 790 { 791 return 1; 792 } 793 static inline int ftrace_is_dead(void) { return 0; } 794 #endif 795 796 int ftrace_event_is_function(struct ftrace_event_call *call); 797 798 /* 799 * struct trace_parser - servers for reading the user input separated by spaces 800 * @cont: set if the input is not complete - no final space char was found 801 * @buffer: holds the parsed user input 802 * @idx: user input length 803 * @size: buffer size 804 */ 805 struct trace_parser { 806 bool cont; 807 char *buffer; 808 unsigned idx; 809 unsigned size; 810 }; 811 812 static inline bool trace_parser_loaded(struct trace_parser *parser) 813 { 814 return (parser->idx != 0); 815 } 816 817 static inline bool trace_parser_cont(struct trace_parser *parser) 818 { 819 return parser->cont; 820 } 821 822 static inline void trace_parser_clear(struct trace_parser *parser) 823 { 824 parser->cont = false; 825 parser->idx = 0; 826 } 827 828 extern int trace_parser_get_init(struct trace_parser *parser, int size); 829 extern void trace_parser_put(struct trace_parser *parser); 830 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 831 size_t cnt, loff_t *ppos); 832 833 /* 834 * trace_iterator_flags is an enumeration that defines bit 835 * positions into trace_flags that controls the output. 836 * 837 * NOTE: These bits must match the trace_options array in 838 * trace.c. 839 */ 840 enum trace_iterator_flags { 841 TRACE_ITER_PRINT_PARENT = 0x01, 842 TRACE_ITER_SYM_OFFSET = 0x02, 843 TRACE_ITER_SYM_ADDR = 0x04, 844 TRACE_ITER_VERBOSE = 0x08, 845 TRACE_ITER_RAW = 0x10, 846 TRACE_ITER_HEX = 0x20, 847 TRACE_ITER_BIN = 0x40, 848 TRACE_ITER_BLOCK = 0x80, 849 TRACE_ITER_STACKTRACE = 0x100, 850 TRACE_ITER_PRINTK = 0x200, 851 TRACE_ITER_PREEMPTONLY = 0x400, 852 TRACE_ITER_BRANCH = 0x800, 853 TRACE_ITER_ANNOTATE = 0x1000, 854 TRACE_ITER_USERSTACKTRACE = 0x2000, 855 TRACE_ITER_SYM_USEROBJ = 0x4000, 856 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 857 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 858 TRACE_ITER_LATENCY_FMT = 0x20000, 859 TRACE_ITER_SLEEP_TIME = 0x40000, 860 TRACE_ITER_GRAPH_TIME = 0x80000, 861 TRACE_ITER_RECORD_CMD = 0x100000, 862 TRACE_ITER_OVERWRITE = 0x200000, 863 TRACE_ITER_STOP_ON_FREE = 0x400000, 864 TRACE_ITER_IRQ_INFO = 0x800000, 865 TRACE_ITER_MARKERS = 0x1000000, 866 TRACE_ITER_FUNCTION = 0x2000000, 867 }; 868 869 /* 870 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 871 * control the output of kernel symbols. 872 */ 873 #define TRACE_ITER_SYM_MASK \ 874 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 875 876 extern struct tracer nop_trace; 877 878 #ifdef CONFIG_BRANCH_TRACER 879 extern int enable_branch_tracing(struct trace_array *tr); 880 extern void disable_branch_tracing(void); 881 static inline int trace_branch_enable(struct trace_array *tr) 882 { 883 if (trace_flags & TRACE_ITER_BRANCH) 884 return enable_branch_tracing(tr); 885 return 0; 886 } 887 static inline void trace_branch_disable(void) 888 { 889 /* due to races, always disable */ 890 disable_branch_tracing(); 891 } 892 #else 893 static inline int trace_branch_enable(struct trace_array *tr) 894 { 895 return 0; 896 } 897 static inline void trace_branch_disable(void) 898 { 899 } 900 #endif /* CONFIG_BRANCH_TRACER */ 901 902 /* set ring buffers to default size if not already done so */ 903 int tracing_update_buffers(void); 904 905 struct ftrace_event_field { 906 struct list_head link; 907 const char *name; 908 const char *type; 909 int filter_type; 910 int offset; 911 int size; 912 int is_signed; 913 }; 914 915 struct event_filter { 916 int n_preds; /* Number assigned */ 917 int a_preds; /* allocated */ 918 struct filter_pred *preds; 919 struct filter_pred *root; 920 char *filter_string; 921 }; 922 923 struct event_subsystem { 924 struct list_head list; 925 const char *name; 926 struct event_filter *filter; 927 int ref_count; 928 }; 929 930 struct ftrace_subsystem_dir { 931 struct list_head list; 932 struct event_subsystem *subsystem; 933 struct trace_array *tr; 934 struct dentry *entry; 935 int ref_count; 936 int nr_events; 937 }; 938 939 #define FILTER_PRED_INVALID ((unsigned short)-1) 940 #define FILTER_PRED_IS_RIGHT (1 << 15) 941 #define FILTER_PRED_FOLD (1 << 15) 942 943 /* 944 * The max preds is the size of unsigned short with 945 * two flags at the MSBs. One bit is used for both the IS_RIGHT 946 * and FOLD flags. The other is reserved. 947 * 948 * 2^14 preds is way more than enough. 949 */ 950 #define MAX_FILTER_PRED 16384 951 952 struct filter_pred; 953 struct regex; 954 955 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 956 957 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 958 959 enum regex_type { 960 MATCH_FULL = 0, 961 MATCH_FRONT_ONLY, 962 MATCH_MIDDLE_ONLY, 963 MATCH_END_ONLY, 964 }; 965 966 struct regex { 967 char pattern[MAX_FILTER_STR_VAL]; 968 int len; 969 int field_len; 970 regex_match_func match; 971 }; 972 973 struct filter_pred { 974 filter_pred_fn_t fn; 975 u64 val; 976 struct regex regex; 977 unsigned short *ops; 978 struct ftrace_event_field *field; 979 int offset; 980 int not; 981 int op; 982 unsigned short index; 983 unsigned short parent; 984 unsigned short left; 985 unsigned short right; 986 }; 987 988 extern enum regex_type 989 filter_parse_regex(char *buff, int len, char **search, int *not); 990 extern void print_event_filter(struct ftrace_event_call *call, 991 struct trace_seq *s); 992 extern int apply_event_filter(struct ftrace_event_call *call, 993 char *filter_string); 994 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir, 995 char *filter_string); 996 extern void print_subsystem_event_filter(struct event_subsystem *system, 997 struct trace_seq *s); 998 extern int filter_assign_type(const char *type); 999 1000 struct ftrace_event_field * 1001 trace_find_event_field(struct ftrace_event_call *call, char *name); 1002 1003 static inline int 1004 filter_check_discard(struct ftrace_event_call *call, void *rec, 1005 struct ring_buffer *buffer, 1006 struct ring_buffer_event *event) 1007 { 1008 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && 1009 !filter_match_preds(call->filter, rec)) { 1010 ring_buffer_discard_commit(buffer, event); 1011 return 1; 1012 } 1013 1014 return 0; 1015 } 1016 1017 extern void trace_event_enable_cmd_record(bool enable); 1018 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1019 extern int event_trace_del_tracer(struct trace_array *tr); 1020 1021 extern struct mutex event_mutex; 1022 extern struct list_head ftrace_events; 1023 1024 extern const char *__start___trace_bprintk_fmt[]; 1025 extern const char *__stop___trace_bprintk_fmt[]; 1026 1027 extern const char *__start___tracepoint_str[]; 1028 extern const char *__stop___tracepoint_str[]; 1029 1030 void trace_printk_init_buffers(void); 1031 void trace_printk_start_comm(void); 1032 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1033 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1034 1035 /* 1036 * Normal trace_printk() and friends allocates special buffers 1037 * to do the manipulation, as well as saves the print formats 1038 * into sections to display. But the trace infrastructure wants 1039 * to use these without the added overhead at the price of being 1040 * a bit slower (used mainly for warnings, where we don't care 1041 * about performance). The internal_trace_puts() is for such 1042 * a purpose. 1043 */ 1044 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1045 1046 #undef FTRACE_ENTRY 1047 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1048 extern struct ftrace_event_call \ 1049 __attribute__((__aligned__(4))) event_##call; 1050 #undef FTRACE_ENTRY_DUP 1051 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1052 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1053 filter) 1054 #include "trace_entries.h" 1055 1056 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1057 int perf_ftrace_event_register(struct ftrace_event_call *call, 1058 enum trace_reg type, void *data); 1059 #else 1060 #define perf_ftrace_event_register NULL 1061 #endif 1062 1063 #endif /* _LINUX_KERNEL_TRACE_H */ 1064