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 }; 128 129 #define TRACE_BUF_SIZE 1024 130 131 struct trace_array; 132 133 struct trace_cpu { 134 struct trace_array *tr; 135 struct dentry *dir; 136 int cpu; 137 }; 138 139 /* 140 * The CPU trace array - it consists of thousands of trace entries 141 * plus some other descriptor data: (for example which task started 142 * the trace, etc.) 143 */ 144 struct trace_array_cpu { 145 struct trace_cpu trace_cpu; 146 atomic_t disabled; 147 void *buffer_page; /* ring buffer spare */ 148 149 unsigned long entries; 150 unsigned long saved_latency; 151 unsigned long critical_start; 152 unsigned long critical_end; 153 unsigned long critical_sequence; 154 unsigned long nice; 155 unsigned long policy; 156 unsigned long rt_priority; 157 unsigned long skipped_entries; 158 cycle_t preempt_timestamp; 159 pid_t pid; 160 kuid_t uid; 161 char comm[TASK_COMM_LEN]; 162 }; 163 164 struct tracer; 165 166 struct trace_buffer { 167 struct trace_array *tr; 168 struct ring_buffer *buffer; 169 struct trace_array_cpu __percpu *data; 170 cycle_t time_start; 171 int cpu; 172 }; 173 174 /* 175 * The trace array - an array of per-CPU trace arrays. This is the 176 * highest level data structure that individual tracers deal with. 177 * They have on/off state as well: 178 */ 179 struct trace_array { 180 struct list_head list; 181 char *name; 182 struct trace_buffer trace_buffer; 183 #ifdef CONFIG_TRACER_MAX_TRACE 184 /* 185 * The max_buffer is used to snapshot the trace when a maximum 186 * latency is reached, or when the user initiates a snapshot. 187 * Some tracers will use this to store a maximum trace while 188 * it continues examining live traces. 189 * 190 * The buffers for the max_buffer are set up the same as the trace_buffer 191 * When a snapshot is taken, the buffer of the max_buffer is swapped 192 * with the buffer of the trace_buffer and the buffers are reset for 193 * the trace_buffer so the tracing can continue. 194 */ 195 struct trace_buffer max_buffer; 196 bool allocated_snapshot; 197 #endif 198 int buffer_disabled; 199 struct trace_cpu trace_cpu; /* place holder */ 200 #ifdef CONFIG_FTRACE_SYSCALLS 201 int sys_refcount_enter; 202 int sys_refcount_exit; 203 DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls); 204 DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls); 205 #endif 206 int stop_count; 207 int clock_id; 208 struct tracer *current_trace; 209 unsigned int flags; 210 raw_spinlock_t start_lock; 211 struct dentry *dir; 212 struct dentry *options; 213 struct dentry *percpu_dir; 214 struct dentry *event_dir; 215 struct list_head systems; 216 struct list_head events; 217 struct task_struct *waiter; 218 int ref; 219 }; 220 221 enum { 222 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 223 }; 224 225 extern struct list_head ftrace_trace_arrays; 226 227 /* 228 * The global tracer (top) should be the first trace array added, 229 * but we check the flag anyway. 230 */ 231 static inline struct trace_array *top_trace_array(void) 232 { 233 struct trace_array *tr; 234 235 tr = list_entry(ftrace_trace_arrays.prev, 236 typeof(*tr), list); 237 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 238 return tr; 239 } 240 241 #define FTRACE_CMP_TYPE(var, type) \ 242 __builtin_types_compatible_p(typeof(var), type *) 243 244 #undef IF_ASSIGN 245 #define IF_ASSIGN(var, entry, etype, id) \ 246 if (FTRACE_CMP_TYPE(var, etype)) { \ 247 var = (typeof(var))(entry); \ 248 WARN_ON(id && (entry)->type != id); \ 249 break; \ 250 } 251 252 /* Will cause compile errors if type is not found. */ 253 extern void __ftrace_bad_type(void); 254 255 /* 256 * The trace_assign_type is a verifier that the entry type is 257 * the same as the type being assigned. To add new types simply 258 * add a line with the following format: 259 * 260 * IF_ASSIGN(var, ent, type, id); 261 * 262 * Where "type" is the trace type that includes the trace_entry 263 * as the "ent" item. And "id" is the trace identifier that is 264 * used in the trace_type enum. 265 * 266 * If the type can have more than one id, then use zero. 267 */ 268 #define trace_assign_type(var, ent) \ 269 do { \ 270 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 271 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 272 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 273 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 274 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 275 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 276 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 277 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 278 TRACE_MMIO_RW); \ 279 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 280 TRACE_MMIO_MAP); \ 281 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 282 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 283 TRACE_GRAPH_ENT); \ 284 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 285 TRACE_GRAPH_RET); \ 286 __ftrace_bad_type(); \ 287 } while (0) 288 289 /* 290 * An option specific to a tracer. This is a boolean value. 291 * The bit is the bit index that sets its value on the 292 * flags value in struct tracer_flags. 293 */ 294 struct tracer_opt { 295 const char *name; /* Will appear on the trace_options file */ 296 u32 bit; /* Mask assigned in val field in tracer_flags */ 297 }; 298 299 /* 300 * The set of specific options for a tracer. Your tracer 301 * have to set the initial value of the flags val. 302 */ 303 struct tracer_flags { 304 u32 val; 305 struct tracer_opt *opts; 306 }; 307 308 /* Makes more easy to define a tracer opt */ 309 #define TRACER_OPT(s, b) .name = #s, .bit = b 310 311 312 /** 313 * struct tracer - a specific tracer and its callbacks to interact with debugfs 314 * @name: the name chosen to select it on the available_tracers file 315 * @init: called when one switches to this tracer (echo name > current_tracer) 316 * @reset: called when one switches to another tracer 317 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 318 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 319 * @open: called when the trace file is opened 320 * @pipe_open: called when the trace_pipe file is opened 321 * @wait_pipe: override how the user waits for traces on trace_pipe 322 * @close: called when the trace file is released 323 * @pipe_close: called when the trace_pipe file is released 324 * @read: override the default read callback on trace_pipe 325 * @splice_read: override the default splice_read callback on trace_pipe 326 * @selftest: selftest to run on boot (see trace_selftest.c) 327 * @print_headers: override the first lines that describe your columns 328 * @print_line: callback that prints a trace 329 * @set_flag: signals one of your private flags changed (trace_options file) 330 * @flags: your private flags 331 */ 332 struct tracer { 333 const char *name; 334 int (*init)(struct trace_array *tr); 335 void (*reset)(struct trace_array *tr); 336 void (*start)(struct trace_array *tr); 337 void (*stop)(struct trace_array *tr); 338 void (*open)(struct trace_iterator *iter); 339 void (*pipe_open)(struct trace_iterator *iter); 340 void (*wait_pipe)(struct trace_iterator *iter); 341 void (*close)(struct trace_iterator *iter); 342 void (*pipe_close)(struct trace_iterator *iter); 343 ssize_t (*read)(struct trace_iterator *iter, 344 struct file *filp, char __user *ubuf, 345 size_t cnt, loff_t *ppos); 346 ssize_t (*splice_read)(struct trace_iterator *iter, 347 struct file *filp, 348 loff_t *ppos, 349 struct pipe_inode_info *pipe, 350 size_t len, 351 unsigned int flags); 352 #ifdef CONFIG_FTRACE_STARTUP_TEST 353 int (*selftest)(struct tracer *trace, 354 struct trace_array *tr); 355 #endif 356 void (*print_header)(struct seq_file *m); 357 enum print_line_t (*print_line)(struct trace_iterator *iter); 358 /* If you handled the flag setting, return 0 */ 359 int (*set_flag)(u32 old_flags, u32 bit, int set); 360 /* Return 0 if OK with change, else return non-zero */ 361 int (*flag_changed)(struct tracer *tracer, 362 u32 mask, int set); 363 struct tracer *next; 364 struct tracer_flags *flags; 365 bool print_max; 366 bool enabled; 367 #ifdef CONFIG_TRACER_MAX_TRACE 368 bool use_max_tr; 369 #endif 370 }; 371 372 373 /* Only current can touch trace_recursion */ 374 375 /* 376 * For function tracing recursion: 377 * The order of these bits are important. 378 * 379 * When function tracing occurs, the following steps are made: 380 * If arch does not support a ftrace feature: 381 * call internal function (uses INTERNAL bits) which calls... 382 * If callback is registered to the "global" list, the list 383 * function is called and recursion checks the GLOBAL bits. 384 * then this function calls... 385 * The function callback, which can use the FTRACE bits to 386 * check for recursion. 387 * 388 * Now if the arch does not suppport a feature, and it calls 389 * the global list function which calls the ftrace callback 390 * all three of these steps will do a recursion protection. 391 * There's no reason to do one if the previous caller already 392 * did. The recursion that we are protecting against will 393 * go through the same steps again. 394 * 395 * To prevent the multiple recursion checks, if a recursion 396 * bit is set that is higher than the MAX bit of the current 397 * check, then we know that the check was made by the previous 398 * caller, and we can skip the current check. 399 */ 400 enum { 401 TRACE_BUFFER_BIT, 402 TRACE_BUFFER_NMI_BIT, 403 TRACE_BUFFER_IRQ_BIT, 404 TRACE_BUFFER_SIRQ_BIT, 405 406 /* Start of function recursion bits */ 407 TRACE_FTRACE_BIT, 408 TRACE_FTRACE_NMI_BIT, 409 TRACE_FTRACE_IRQ_BIT, 410 TRACE_FTRACE_SIRQ_BIT, 411 412 /* GLOBAL_BITs must be greater than FTRACE_BITs */ 413 TRACE_GLOBAL_BIT, 414 TRACE_GLOBAL_NMI_BIT, 415 TRACE_GLOBAL_IRQ_BIT, 416 TRACE_GLOBAL_SIRQ_BIT, 417 418 /* INTERNAL_BITs must be greater than GLOBAL_BITs */ 419 TRACE_INTERNAL_BIT, 420 TRACE_INTERNAL_NMI_BIT, 421 TRACE_INTERNAL_IRQ_BIT, 422 TRACE_INTERNAL_SIRQ_BIT, 423 424 TRACE_CONTROL_BIT, 425 426 /* 427 * Abuse of the trace_recursion. 428 * As we need a way to maintain state if we are tracing the function 429 * graph in irq because we want to trace a particular function that 430 * was called in irq context but we have irq tracing off. Since this 431 * can only be modified by current, we can reuse trace_recursion. 432 */ 433 TRACE_IRQ_BIT, 434 }; 435 436 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 437 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 438 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 439 440 #define TRACE_CONTEXT_BITS 4 441 442 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 443 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 444 445 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT 446 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1) 447 448 #define TRACE_LIST_START TRACE_INTERNAL_BIT 449 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 450 451 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 452 453 static __always_inline int trace_get_context_bit(void) 454 { 455 int bit; 456 457 if (in_interrupt()) { 458 if (in_nmi()) 459 bit = 0; 460 461 else if (in_irq()) 462 bit = 1; 463 else 464 bit = 2; 465 } else 466 bit = 3; 467 468 return bit; 469 } 470 471 static __always_inline int trace_test_and_set_recursion(int start, int max) 472 { 473 unsigned int val = current->trace_recursion; 474 int bit; 475 476 /* A previous recursion check was made */ 477 if ((val & TRACE_CONTEXT_MASK) > max) 478 return 0; 479 480 bit = trace_get_context_bit() + start; 481 if (unlikely(val & (1 << bit))) 482 return -1; 483 484 val |= 1 << bit; 485 current->trace_recursion = val; 486 barrier(); 487 488 return bit; 489 } 490 491 static __always_inline void trace_clear_recursion(int bit) 492 { 493 unsigned int val = current->trace_recursion; 494 495 if (!bit) 496 return; 497 498 bit = 1 << bit; 499 val &= ~bit; 500 501 barrier(); 502 current->trace_recursion = val; 503 } 504 505 static inline struct ring_buffer_iter * 506 trace_buffer_iter(struct trace_iterator *iter, int cpu) 507 { 508 if (iter->buffer_iter && iter->buffer_iter[cpu]) 509 return iter->buffer_iter[cpu]; 510 return NULL; 511 } 512 513 int tracer_init(struct tracer *t, struct trace_array *tr); 514 int tracing_is_enabled(void); 515 void tracing_reset(struct trace_buffer *buf, int cpu); 516 void tracing_reset_online_cpus(struct trace_buffer *buf); 517 void tracing_reset_current(int cpu); 518 void tracing_reset_all_online_cpus(void); 519 int tracing_open_generic(struct inode *inode, struct file *filp); 520 struct dentry *trace_create_file(const char *name, 521 umode_t mode, 522 struct dentry *parent, 523 void *data, 524 const struct file_operations *fops); 525 526 struct dentry *tracing_init_dentry_tr(struct trace_array *tr); 527 struct dentry *tracing_init_dentry(void); 528 529 struct ring_buffer_event; 530 531 struct ring_buffer_event * 532 trace_buffer_lock_reserve(struct ring_buffer *buffer, 533 int type, 534 unsigned long len, 535 unsigned long flags, 536 int pc); 537 538 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 539 struct trace_array_cpu *data); 540 541 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 542 int *ent_cpu, u64 *ent_ts); 543 544 void __buffer_unlock_commit(struct ring_buffer *buffer, 545 struct ring_buffer_event *event); 546 547 int trace_empty(struct trace_iterator *iter); 548 549 void *trace_find_next_entry_inc(struct trace_iterator *iter); 550 551 void trace_init_global_iter(struct trace_iterator *iter); 552 553 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 554 555 void poll_wait_pipe(struct trace_iterator *iter); 556 557 void ftrace(struct trace_array *tr, 558 struct trace_array_cpu *data, 559 unsigned long ip, 560 unsigned long parent_ip, 561 unsigned long flags, int pc); 562 void tracing_sched_switch_trace(struct trace_array *tr, 563 struct task_struct *prev, 564 struct task_struct *next, 565 unsigned long flags, int pc); 566 567 void tracing_sched_wakeup_trace(struct trace_array *tr, 568 struct task_struct *wakee, 569 struct task_struct *cur, 570 unsigned long flags, int pc); 571 void trace_function(struct trace_array *tr, 572 unsigned long ip, 573 unsigned long parent_ip, 574 unsigned long flags, int pc); 575 void trace_graph_function(struct trace_array *tr, 576 unsigned long ip, 577 unsigned long parent_ip, 578 unsigned long flags, int pc); 579 void trace_latency_header(struct seq_file *m); 580 void trace_default_header(struct seq_file *m); 581 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 582 int trace_empty(struct trace_iterator *iter); 583 584 void trace_graph_return(struct ftrace_graph_ret *trace); 585 int trace_graph_entry(struct ftrace_graph_ent *trace); 586 void set_graph_array(struct trace_array *tr); 587 588 void tracing_start_cmdline_record(void); 589 void tracing_stop_cmdline_record(void); 590 void tracing_sched_switch_assign_trace(struct trace_array *tr); 591 void tracing_stop_sched_switch_record(void); 592 void tracing_start_sched_switch_record(void); 593 int register_tracer(struct tracer *type); 594 int is_tracing_stopped(void); 595 596 extern cpumask_var_t __read_mostly tracing_buffer_mask; 597 598 #define for_each_tracing_cpu(cpu) \ 599 for_each_cpu(cpu, tracing_buffer_mask) 600 601 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 602 603 extern unsigned long tracing_thresh; 604 605 #ifdef CONFIG_TRACER_MAX_TRACE 606 extern unsigned long tracing_max_latency; 607 608 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 609 void update_max_tr_single(struct trace_array *tr, 610 struct task_struct *tsk, int cpu); 611 #endif /* CONFIG_TRACER_MAX_TRACE */ 612 613 #ifdef CONFIG_STACKTRACE 614 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 615 int skip, int pc); 616 617 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, 618 int skip, int pc, struct pt_regs *regs); 619 620 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 621 int pc); 622 623 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 624 int pc); 625 #else 626 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 627 unsigned long flags, int skip, int pc) 628 { 629 } 630 631 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, 632 unsigned long flags, int skip, 633 int pc, struct pt_regs *regs) 634 { 635 } 636 637 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 638 unsigned long flags, int pc) 639 { 640 } 641 642 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 643 int skip, int pc) 644 { 645 } 646 #endif /* CONFIG_STACKTRACE */ 647 648 extern cycle_t ftrace_now(int cpu); 649 650 extern void trace_find_cmdline(int pid, char comm[]); 651 652 #ifdef CONFIG_DYNAMIC_FTRACE 653 extern unsigned long ftrace_update_tot_cnt; 654 #endif 655 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 656 extern int DYN_FTRACE_TEST_NAME(void); 657 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 658 extern int DYN_FTRACE_TEST_NAME2(void); 659 660 extern bool ring_buffer_expanded; 661 extern bool tracing_selftest_disabled; 662 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 663 664 #ifdef CONFIG_FTRACE_STARTUP_TEST 665 extern int trace_selftest_startup_function(struct tracer *trace, 666 struct trace_array *tr); 667 extern int trace_selftest_startup_function_graph(struct tracer *trace, 668 struct trace_array *tr); 669 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 670 struct trace_array *tr); 671 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 672 struct trace_array *tr); 673 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 674 struct trace_array *tr); 675 extern int trace_selftest_startup_wakeup(struct tracer *trace, 676 struct trace_array *tr); 677 extern int trace_selftest_startup_nop(struct tracer *trace, 678 struct trace_array *tr); 679 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 680 struct trace_array *tr); 681 extern int trace_selftest_startup_branch(struct tracer *trace, 682 struct trace_array *tr); 683 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 684 685 extern void *head_page(struct trace_array_cpu *data); 686 extern unsigned long long ns2usecs(cycle_t nsec); 687 extern int 688 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 689 extern int 690 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 691 extern int 692 trace_array_vprintk(struct trace_array *tr, 693 unsigned long ip, const char *fmt, va_list args); 694 int trace_array_printk(struct trace_array *tr, 695 unsigned long ip, const char *fmt, ...); 696 int trace_array_printk_buf(struct ring_buffer *buffer, 697 unsigned long ip, const char *fmt, ...); 698 void trace_printk_seq(struct trace_seq *s); 699 enum print_line_t print_trace_line(struct trace_iterator *iter); 700 701 extern unsigned long trace_flags; 702 703 extern int trace_clock_id; 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 static inline int ftrace_trace_task(struct task_struct *task) 780 { 781 if (list_empty(&ftrace_pids)) 782 return 1; 783 784 return test_tsk_trace_trace(task); 785 } 786 extern int ftrace_is_dead(void); 787 #else 788 static inline int ftrace_trace_task(struct task_struct *task) 789 { 790 return 1; 791 } 792 static inline int ftrace_is_dead(void) { return 0; } 793 #endif 794 795 int ftrace_event_is_function(struct ftrace_event_call *call); 796 797 /* 798 * struct trace_parser - servers for reading the user input separated by spaces 799 * @cont: set if the input is not complete - no final space char was found 800 * @buffer: holds the parsed user input 801 * @idx: user input length 802 * @size: buffer size 803 */ 804 struct trace_parser { 805 bool cont; 806 char *buffer; 807 unsigned idx; 808 unsigned size; 809 }; 810 811 static inline bool trace_parser_loaded(struct trace_parser *parser) 812 { 813 return (parser->idx != 0); 814 } 815 816 static inline bool trace_parser_cont(struct trace_parser *parser) 817 { 818 return parser->cont; 819 } 820 821 static inline void trace_parser_clear(struct trace_parser *parser) 822 { 823 parser->cont = false; 824 parser->idx = 0; 825 } 826 827 extern int trace_parser_get_init(struct trace_parser *parser, int size); 828 extern void trace_parser_put(struct trace_parser *parser); 829 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 830 size_t cnt, loff_t *ppos); 831 832 /* 833 * trace_iterator_flags is an enumeration that defines bit 834 * positions into trace_flags that controls the output. 835 * 836 * NOTE: These bits must match the trace_options array in 837 * trace.c. 838 */ 839 enum trace_iterator_flags { 840 TRACE_ITER_PRINT_PARENT = 0x01, 841 TRACE_ITER_SYM_OFFSET = 0x02, 842 TRACE_ITER_SYM_ADDR = 0x04, 843 TRACE_ITER_VERBOSE = 0x08, 844 TRACE_ITER_RAW = 0x10, 845 TRACE_ITER_HEX = 0x20, 846 TRACE_ITER_BIN = 0x40, 847 TRACE_ITER_BLOCK = 0x80, 848 TRACE_ITER_STACKTRACE = 0x100, 849 TRACE_ITER_PRINTK = 0x200, 850 TRACE_ITER_PREEMPTONLY = 0x400, 851 TRACE_ITER_BRANCH = 0x800, 852 TRACE_ITER_ANNOTATE = 0x1000, 853 TRACE_ITER_USERSTACKTRACE = 0x2000, 854 TRACE_ITER_SYM_USEROBJ = 0x4000, 855 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 856 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 857 TRACE_ITER_LATENCY_FMT = 0x20000, 858 TRACE_ITER_SLEEP_TIME = 0x40000, 859 TRACE_ITER_GRAPH_TIME = 0x80000, 860 TRACE_ITER_RECORD_CMD = 0x100000, 861 TRACE_ITER_OVERWRITE = 0x200000, 862 TRACE_ITER_STOP_ON_FREE = 0x400000, 863 TRACE_ITER_IRQ_INFO = 0x800000, 864 TRACE_ITER_MARKERS = 0x1000000, 865 TRACE_ITER_FUNCTION = 0x2000000, 866 }; 867 868 /* 869 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 870 * control the output of kernel symbols. 871 */ 872 #define TRACE_ITER_SYM_MASK \ 873 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 874 875 extern struct tracer nop_trace; 876 877 #ifdef CONFIG_BRANCH_TRACER 878 extern int enable_branch_tracing(struct trace_array *tr); 879 extern void disable_branch_tracing(void); 880 static inline int trace_branch_enable(struct trace_array *tr) 881 { 882 if (trace_flags & TRACE_ITER_BRANCH) 883 return enable_branch_tracing(tr); 884 return 0; 885 } 886 static inline void trace_branch_disable(void) 887 { 888 /* due to races, always disable */ 889 disable_branch_tracing(); 890 } 891 #else 892 static inline int trace_branch_enable(struct trace_array *tr) 893 { 894 return 0; 895 } 896 static inline void trace_branch_disable(void) 897 { 898 } 899 #endif /* CONFIG_BRANCH_TRACER */ 900 901 /* set ring buffers to default size if not already done so */ 902 int tracing_update_buffers(void); 903 904 /* trace event type bit fields, not numeric */ 905 enum { 906 TRACE_EVENT_TYPE_PRINTF = 1, 907 TRACE_EVENT_TYPE_RAW = 2, 908 }; 909 910 struct ftrace_event_field { 911 struct list_head link; 912 const char *name; 913 const char *type; 914 int filter_type; 915 int offset; 916 int size; 917 int is_signed; 918 }; 919 920 struct event_filter { 921 int n_preds; /* Number assigned */ 922 int a_preds; /* allocated */ 923 struct filter_pred *preds; 924 struct filter_pred *root; 925 char *filter_string; 926 }; 927 928 struct event_subsystem { 929 struct list_head list; 930 const char *name; 931 struct event_filter *filter; 932 int ref_count; 933 }; 934 935 struct ftrace_subsystem_dir { 936 struct list_head list; 937 struct event_subsystem *subsystem; 938 struct trace_array *tr; 939 struct dentry *entry; 940 int ref_count; 941 int nr_events; 942 }; 943 944 #define FILTER_PRED_INVALID ((unsigned short)-1) 945 #define FILTER_PRED_IS_RIGHT (1 << 15) 946 #define FILTER_PRED_FOLD (1 << 15) 947 948 /* 949 * The max preds is the size of unsigned short with 950 * two flags at the MSBs. One bit is used for both the IS_RIGHT 951 * and FOLD flags. The other is reserved. 952 * 953 * 2^14 preds is way more than enough. 954 */ 955 #define MAX_FILTER_PRED 16384 956 957 struct filter_pred; 958 struct regex; 959 960 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 961 962 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 963 964 enum regex_type { 965 MATCH_FULL = 0, 966 MATCH_FRONT_ONLY, 967 MATCH_MIDDLE_ONLY, 968 MATCH_END_ONLY, 969 }; 970 971 struct regex { 972 char pattern[MAX_FILTER_STR_VAL]; 973 int len; 974 int field_len; 975 regex_match_func match; 976 }; 977 978 struct filter_pred { 979 filter_pred_fn_t fn; 980 u64 val; 981 struct regex regex; 982 unsigned short *ops; 983 struct ftrace_event_field *field; 984 int offset; 985 int not; 986 int op; 987 unsigned short index; 988 unsigned short parent; 989 unsigned short left; 990 unsigned short right; 991 }; 992 993 extern enum regex_type 994 filter_parse_regex(char *buff, int len, char **search, int *not); 995 extern void print_event_filter(struct ftrace_event_call *call, 996 struct trace_seq *s); 997 extern int apply_event_filter(struct ftrace_event_call *call, 998 char *filter_string); 999 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir, 1000 char *filter_string); 1001 extern void print_subsystem_event_filter(struct event_subsystem *system, 1002 struct trace_seq *s); 1003 extern int filter_assign_type(const char *type); 1004 1005 struct ftrace_event_field * 1006 trace_find_event_field(struct ftrace_event_call *call, char *name); 1007 1008 static inline int 1009 filter_check_discard(struct ftrace_event_call *call, void *rec, 1010 struct ring_buffer *buffer, 1011 struct ring_buffer_event *event) 1012 { 1013 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && 1014 !filter_match_preds(call->filter, rec)) { 1015 ring_buffer_discard_commit(buffer, event); 1016 return 1; 1017 } 1018 1019 return 0; 1020 } 1021 1022 extern void trace_event_enable_cmd_record(bool enable); 1023 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1024 extern int event_trace_del_tracer(struct trace_array *tr); 1025 1026 extern struct mutex event_mutex; 1027 extern struct list_head ftrace_events; 1028 1029 extern const char *__start___trace_bprintk_fmt[]; 1030 extern const char *__stop___trace_bprintk_fmt[]; 1031 1032 void trace_printk_init_buffers(void); 1033 void trace_printk_start_comm(void); 1034 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1035 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1036 1037 /* 1038 * Normal trace_printk() and friends allocates special buffers 1039 * to do the manipulation, as well as saves the print formats 1040 * into sections to display. But the trace infrastructure wants 1041 * to use these without the added overhead at the price of being 1042 * a bit slower (used mainly for warnings, where we don't care 1043 * about performance). The internal_trace_puts() is for such 1044 * a purpose. 1045 */ 1046 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1047 1048 #undef FTRACE_ENTRY 1049 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1050 extern struct ftrace_event_call \ 1051 __attribute__((__aligned__(4))) event_##call; 1052 #undef FTRACE_ENTRY_DUP 1053 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1054 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1055 filter) 1056 #include "trace_entries.h" 1057 1058 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1059 int perf_ftrace_event_register(struct ftrace_event_call *call, 1060 enum trace_reg type, void *data); 1061 #else 1062 #define perf_ftrace_event_register NULL 1063 #endif 1064 1065 #endif /* _LINUX_KERNEL_TRACE_H */ 1066