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 extern struct mutex trace_types_lock; 228 229 extern int trace_array_get(struct trace_array *tr); 230 extern void trace_array_put(struct trace_array *tr); 231 232 /* 233 * The global tracer (top) should be the first trace array added, 234 * but we check the flag anyway. 235 */ 236 static inline struct trace_array *top_trace_array(void) 237 { 238 struct trace_array *tr; 239 240 tr = list_entry(ftrace_trace_arrays.prev, 241 typeof(*tr), list); 242 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 243 return tr; 244 } 245 246 #define FTRACE_CMP_TYPE(var, type) \ 247 __builtin_types_compatible_p(typeof(var), type *) 248 249 #undef IF_ASSIGN 250 #define IF_ASSIGN(var, entry, etype, id) \ 251 if (FTRACE_CMP_TYPE(var, etype)) { \ 252 var = (typeof(var))(entry); \ 253 WARN_ON(id && (entry)->type != id); \ 254 break; \ 255 } 256 257 /* Will cause compile errors if type is not found. */ 258 extern void __ftrace_bad_type(void); 259 260 /* 261 * The trace_assign_type is a verifier that the entry type is 262 * the same as the type being assigned. To add new types simply 263 * add a line with the following format: 264 * 265 * IF_ASSIGN(var, ent, type, id); 266 * 267 * Where "type" is the trace type that includes the trace_entry 268 * as the "ent" item. And "id" is the trace identifier that is 269 * used in the trace_type enum. 270 * 271 * If the type can have more than one id, then use zero. 272 */ 273 #define trace_assign_type(var, ent) \ 274 do { \ 275 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 276 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 277 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 278 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 279 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 280 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 281 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 282 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 283 TRACE_MMIO_RW); \ 284 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 285 TRACE_MMIO_MAP); \ 286 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 287 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 288 TRACE_GRAPH_ENT); \ 289 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 290 TRACE_GRAPH_RET); \ 291 __ftrace_bad_type(); \ 292 } while (0) 293 294 /* 295 * An option specific to a tracer. This is a boolean value. 296 * The bit is the bit index that sets its value on the 297 * flags value in struct tracer_flags. 298 */ 299 struct tracer_opt { 300 const char *name; /* Will appear on the trace_options file */ 301 u32 bit; /* Mask assigned in val field in tracer_flags */ 302 }; 303 304 /* 305 * The set of specific options for a tracer. Your tracer 306 * have to set the initial value of the flags val. 307 */ 308 struct tracer_flags { 309 u32 val; 310 struct tracer_opt *opts; 311 }; 312 313 /* Makes more easy to define a tracer opt */ 314 #define TRACER_OPT(s, b) .name = #s, .bit = b 315 316 317 /** 318 * struct tracer - a specific tracer and its callbacks to interact with debugfs 319 * @name: the name chosen to select it on the available_tracers file 320 * @init: called when one switches to this tracer (echo name > current_tracer) 321 * @reset: called when one switches to another tracer 322 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 323 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 324 * @open: called when the trace file is opened 325 * @pipe_open: called when the trace_pipe file is opened 326 * @wait_pipe: override how the user waits for traces on trace_pipe 327 * @close: called when the trace file is released 328 * @pipe_close: called when the trace_pipe file is released 329 * @read: override the default read callback on trace_pipe 330 * @splice_read: override the default splice_read callback on trace_pipe 331 * @selftest: selftest to run on boot (see trace_selftest.c) 332 * @print_headers: override the first lines that describe your columns 333 * @print_line: callback that prints a trace 334 * @set_flag: signals one of your private flags changed (trace_options file) 335 * @flags: your private flags 336 */ 337 struct tracer { 338 const char *name; 339 int (*init)(struct trace_array *tr); 340 void (*reset)(struct trace_array *tr); 341 void (*start)(struct trace_array *tr); 342 void (*stop)(struct trace_array *tr); 343 void (*open)(struct trace_iterator *iter); 344 void (*pipe_open)(struct trace_iterator *iter); 345 void (*wait_pipe)(struct trace_iterator *iter); 346 void (*close)(struct trace_iterator *iter); 347 void (*pipe_close)(struct trace_iterator *iter); 348 ssize_t (*read)(struct trace_iterator *iter, 349 struct file *filp, char __user *ubuf, 350 size_t cnt, loff_t *ppos); 351 ssize_t (*splice_read)(struct trace_iterator *iter, 352 struct file *filp, 353 loff_t *ppos, 354 struct pipe_inode_info *pipe, 355 size_t len, 356 unsigned int flags); 357 #ifdef CONFIG_FTRACE_STARTUP_TEST 358 int (*selftest)(struct tracer *trace, 359 struct trace_array *tr); 360 #endif 361 void (*print_header)(struct seq_file *m); 362 enum print_line_t (*print_line)(struct trace_iterator *iter); 363 /* If you handled the flag setting, return 0 */ 364 int (*set_flag)(u32 old_flags, u32 bit, int set); 365 /* Return 0 if OK with change, else return non-zero */ 366 int (*flag_changed)(struct tracer *tracer, 367 u32 mask, int set); 368 struct tracer *next; 369 struct tracer_flags *flags; 370 bool print_max; 371 bool enabled; 372 #ifdef CONFIG_TRACER_MAX_TRACE 373 bool use_max_tr; 374 #endif 375 }; 376 377 378 /* Only current can touch trace_recursion */ 379 380 /* 381 * For function tracing recursion: 382 * The order of these bits are important. 383 * 384 * When function tracing occurs, the following steps are made: 385 * If arch does not support a ftrace feature: 386 * call internal function (uses INTERNAL bits) which calls... 387 * If callback is registered to the "global" list, the list 388 * function is called and recursion checks the GLOBAL bits. 389 * then this function calls... 390 * The function callback, which can use the FTRACE bits to 391 * check for recursion. 392 * 393 * Now if the arch does not suppport a feature, and it calls 394 * the global list function which calls the ftrace callback 395 * all three of these steps will do a recursion protection. 396 * There's no reason to do one if the previous caller already 397 * did. The recursion that we are protecting against will 398 * go through the same steps again. 399 * 400 * To prevent the multiple recursion checks, if a recursion 401 * bit is set that is higher than the MAX bit of the current 402 * check, then we know that the check was made by the previous 403 * caller, and we can skip the current check. 404 */ 405 enum { 406 TRACE_BUFFER_BIT, 407 TRACE_BUFFER_NMI_BIT, 408 TRACE_BUFFER_IRQ_BIT, 409 TRACE_BUFFER_SIRQ_BIT, 410 411 /* Start of function recursion bits */ 412 TRACE_FTRACE_BIT, 413 TRACE_FTRACE_NMI_BIT, 414 TRACE_FTRACE_IRQ_BIT, 415 TRACE_FTRACE_SIRQ_BIT, 416 417 /* GLOBAL_BITs must be greater than FTRACE_BITs */ 418 TRACE_GLOBAL_BIT, 419 TRACE_GLOBAL_NMI_BIT, 420 TRACE_GLOBAL_IRQ_BIT, 421 TRACE_GLOBAL_SIRQ_BIT, 422 423 /* INTERNAL_BITs must be greater than GLOBAL_BITs */ 424 TRACE_INTERNAL_BIT, 425 TRACE_INTERNAL_NMI_BIT, 426 TRACE_INTERNAL_IRQ_BIT, 427 TRACE_INTERNAL_SIRQ_BIT, 428 429 TRACE_CONTROL_BIT, 430 431 /* 432 * Abuse of the trace_recursion. 433 * As we need a way to maintain state if we are tracing the function 434 * graph in irq because we want to trace a particular function that 435 * was called in irq context but we have irq tracing off. Since this 436 * can only be modified by current, we can reuse trace_recursion. 437 */ 438 TRACE_IRQ_BIT, 439 }; 440 441 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 442 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 443 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 444 445 #define TRACE_CONTEXT_BITS 4 446 447 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 448 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 449 450 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT 451 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1) 452 453 #define TRACE_LIST_START TRACE_INTERNAL_BIT 454 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 455 456 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 457 458 static __always_inline int trace_get_context_bit(void) 459 { 460 int bit; 461 462 if (in_interrupt()) { 463 if (in_nmi()) 464 bit = 0; 465 466 else if (in_irq()) 467 bit = 1; 468 else 469 bit = 2; 470 } else 471 bit = 3; 472 473 return bit; 474 } 475 476 static __always_inline int trace_test_and_set_recursion(int start, int max) 477 { 478 unsigned int val = current->trace_recursion; 479 int bit; 480 481 /* A previous recursion check was made */ 482 if ((val & TRACE_CONTEXT_MASK) > max) 483 return 0; 484 485 bit = trace_get_context_bit() + start; 486 if (unlikely(val & (1 << bit))) 487 return -1; 488 489 val |= 1 << bit; 490 current->trace_recursion = val; 491 barrier(); 492 493 return bit; 494 } 495 496 static __always_inline void trace_clear_recursion(int bit) 497 { 498 unsigned int val = current->trace_recursion; 499 500 if (!bit) 501 return; 502 503 bit = 1 << bit; 504 val &= ~bit; 505 506 barrier(); 507 current->trace_recursion = val; 508 } 509 510 static inline struct ring_buffer_iter * 511 trace_buffer_iter(struct trace_iterator *iter, int cpu) 512 { 513 if (iter->buffer_iter && iter->buffer_iter[cpu]) 514 return iter->buffer_iter[cpu]; 515 return NULL; 516 } 517 518 int tracer_init(struct tracer *t, struct trace_array *tr); 519 int tracing_is_enabled(void); 520 void tracing_reset(struct trace_buffer *buf, int cpu); 521 void tracing_reset_online_cpus(struct trace_buffer *buf); 522 void tracing_reset_current(int cpu); 523 void tracing_reset_all_online_cpus(void); 524 int tracing_open_generic(struct inode *inode, struct file *filp); 525 struct dentry *trace_create_file(const char *name, 526 umode_t mode, 527 struct dentry *parent, 528 void *data, 529 const struct file_operations *fops); 530 531 struct dentry *tracing_init_dentry_tr(struct trace_array *tr); 532 struct dentry *tracing_init_dentry(void); 533 534 struct ring_buffer_event; 535 536 struct ring_buffer_event * 537 trace_buffer_lock_reserve(struct ring_buffer *buffer, 538 int type, 539 unsigned long len, 540 unsigned long flags, 541 int pc); 542 543 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 544 struct trace_array_cpu *data); 545 546 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 547 int *ent_cpu, u64 *ent_ts); 548 549 void __buffer_unlock_commit(struct ring_buffer *buffer, 550 struct ring_buffer_event *event); 551 552 int trace_empty(struct trace_iterator *iter); 553 554 void *trace_find_next_entry_inc(struct trace_iterator *iter); 555 556 void trace_init_global_iter(struct trace_iterator *iter); 557 558 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 559 560 void poll_wait_pipe(struct trace_iterator *iter); 561 562 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 /* Standard output formatting function used for function return traces */ 704 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 705 706 /* Flag options */ 707 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 708 #define TRACE_GRAPH_PRINT_CPU 0x2 709 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 710 #define TRACE_GRAPH_PRINT_PROC 0x8 711 #define TRACE_GRAPH_PRINT_DURATION 0x10 712 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 713 714 extern enum print_line_t 715 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 716 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 717 extern enum print_line_t 718 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 719 extern void graph_trace_open(struct trace_iterator *iter); 720 extern void graph_trace_close(struct trace_iterator *iter); 721 extern int __trace_graph_entry(struct trace_array *tr, 722 struct ftrace_graph_ent *trace, 723 unsigned long flags, int pc); 724 extern void __trace_graph_return(struct trace_array *tr, 725 struct ftrace_graph_ret *trace, 726 unsigned long flags, int pc); 727 728 729 #ifdef CONFIG_DYNAMIC_FTRACE 730 /* TODO: make this variable */ 731 #define FTRACE_GRAPH_MAX_FUNCS 32 732 extern int ftrace_graph_filter_enabled; 733 extern int ftrace_graph_count; 734 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 735 736 static inline int ftrace_graph_addr(unsigned long addr) 737 { 738 int i; 739 740 if (!ftrace_graph_filter_enabled) 741 return 1; 742 743 for (i = 0; i < ftrace_graph_count; i++) { 744 if (addr == ftrace_graph_funcs[i]) { 745 /* 746 * If no irqs are to be traced, but a set_graph_function 747 * is set, and called by an interrupt handler, we still 748 * want to trace it. 749 */ 750 if (in_irq()) 751 trace_recursion_set(TRACE_IRQ_BIT); 752 else 753 trace_recursion_clear(TRACE_IRQ_BIT); 754 return 1; 755 } 756 } 757 758 return 0; 759 } 760 #else 761 static inline int ftrace_graph_addr(unsigned long addr) 762 { 763 return 1; 764 } 765 #endif /* CONFIG_DYNAMIC_FTRACE */ 766 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 767 static inline enum print_line_t 768 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 769 { 770 return TRACE_TYPE_UNHANDLED; 771 } 772 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 773 774 extern struct list_head ftrace_pids; 775 776 #ifdef CONFIG_FUNCTION_TRACER 777 extern bool ftrace_filter_param __initdata; 778 static inline int ftrace_trace_task(struct task_struct *task) 779 { 780 if (list_empty(&ftrace_pids)) 781 return 1; 782 783 return test_tsk_trace_trace(task); 784 } 785 extern int ftrace_is_dead(void); 786 #else 787 static inline int ftrace_trace_task(struct task_struct *task) 788 { 789 return 1; 790 } 791 static inline int ftrace_is_dead(void) { return 0; } 792 #endif 793 794 int ftrace_event_is_function(struct ftrace_event_call *call); 795 796 /* 797 * struct trace_parser - servers for reading the user input separated by spaces 798 * @cont: set if the input is not complete - no final space char was found 799 * @buffer: holds the parsed user input 800 * @idx: user input length 801 * @size: buffer size 802 */ 803 struct trace_parser { 804 bool cont; 805 char *buffer; 806 unsigned idx; 807 unsigned size; 808 }; 809 810 static inline bool trace_parser_loaded(struct trace_parser *parser) 811 { 812 return (parser->idx != 0); 813 } 814 815 static inline bool trace_parser_cont(struct trace_parser *parser) 816 { 817 return parser->cont; 818 } 819 820 static inline void trace_parser_clear(struct trace_parser *parser) 821 { 822 parser->cont = false; 823 parser->idx = 0; 824 } 825 826 extern int trace_parser_get_init(struct trace_parser *parser, int size); 827 extern void trace_parser_put(struct trace_parser *parser); 828 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 829 size_t cnt, loff_t *ppos); 830 831 /* 832 * trace_iterator_flags is an enumeration that defines bit 833 * positions into trace_flags that controls the output. 834 * 835 * NOTE: These bits must match the trace_options array in 836 * trace.c. 837 */ 838 enum trace_iterator_flags { 839 TRACE_ITER_PRINT_PARENT = 0x01, 840 TRACE_ITER_SYM_OFFSET = 0x02, 841 TRACE_ITER_SYM_ADDR = 0x04, 842 TRACE_ITER_VERBOSE = 0x08, 843 TRACE_ITER_RAW = 0x10, 844 TRACE_ITER_HEX = 0x20, 845 TRACE_ITER_BIN = 0x40, 846 TRACE_ITER_BLOCK = 0x80, 847 TRACE_ITER_STACKTRACE = 0x100, 848 TRACE_ITER_PRINTK = 0x200, 849 TRACE_ITER_PREEMPTONLY = 0x400, 850 TRACE_ITER_BRANCH = 0x800, 851 TRACE_ITER_ANNOTATE = 0x1000, 852 TRACE_ITER_USERSTACKTRACE = 0x2000, 853 TRACE_ITER_SYM_USEROBJ = 0x4000, 854 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 855 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 856 TRACE_ITER_LATENCY_FMT = 0x20000, 857 TRACE_ITER_SLEEP_TIME = 0x40000, 858 TRACE_ITER_GRAPH_TIME = 0x80000, 859 TRACE_ITER_RECORD_CMD = 0x100000, 860 TRACE_ITER_OVERWRITE = 0x200000, 861 TRACE_ITER_STOP_ON_FREE = 0x400000, 862 TRACE_ITER_IRQ_INFO = 0x800000, 863 TRACE_ITER_MARKERS = 0x1000000, 864 TRACE_ITER_FUNCTION = 0x2000000, 865 }; 866 867 /* 868 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 869 * control the output of kernel symbols. 870 */ 871 #define TRACE_ITER_SYM_MASK \ 872 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 873 874 extern struct tracer nop_trace; 875 876 #ifdef CONFIG_BRANCH_TRACER 877 extern int enable_branch_tracing(struct trace_array *tr); 878 extern void disable_branch_tracing(void); 879 static inline int trace_branch_enable(struct trace_array *tr) 880 { 881 if (trace_flags & TRACE_ITER_BRANCH) 882 return enable_branch_tracing(tr); 883 return 0; 884 } 885 static inline void trace_branch_disable(void) 886 { 887 /* due to races, always disable */ 888 disable_branch_tracing(); 889 } 890 #else 891 static inline int trace_branch_enable(struct trace_array *tr) 892 { 893 return 0; 894 } 895 static inline void trace_branch_disable(void) 896 { 897 } 898 #endif /* CONFIG_BRANCH_TRACER */ 899 900 /* set ring buffers to default size if not already done so */ 901 int tracing_update_buffers(void); 902 903 struct ftrace_event_field { 904 struct list_head link; 905 const char *name; 906 const char *type; 907 int filter_type; 908 int offset; 909 int size; 910 int is_signed; 911 }; 912 913 struct event_filter { 914 int n_preds; /* Number assigned */ 915 int a_preds; /* allocated */ 916 struct filter_pred *preds; 917 struct filter_pred *root; 918 char *filter_string; 919 }; 920 921 struct event_subsystem { 922 struct list_head list; 923 const char *name; 924 struct event_filter *filter; 925 int ref_count; 926 }; 927 928 struct ftrace_subsystem_dir { 929 struct list_head list; 930 struct event_subsystem *subsystem; 931 struct trace_array *tr; 932 struct dentry *entry; 933 int ref_count; 934 int nr_events; 935 }; 936 937 #define FILTER_PRED_INVALID ((unsigned short)-1) 938 #define FILTER_PRED_IS_RIGHT (1 << 15) 939 #define FILTER_PRED_FOLD (1 << 15) 940 941 /* 942 * The max preds is the size of unsigned short with 943 * two flags at the MSBs. One bit is used for both the IS_RIGHT 944 * and FOLD flags. The other is reserved. 945 * 946 * 2^14 preds is way more than enough. 947 */ 948 #define MAX_FILTER_PRED 16384 949 950 struct filter_pred; 951 struct regex; 952 953 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 954 955 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 956 957 enum regex_type { 958 MATCH_FULL = 0, 959 MATCH_FRONT_ONLY, 960 MATCH_MIDDLE_ONLY, 961 MATCH_END_ONLY, 962 }; 963 964 struct regex { 965 char pattern[MAX_FILTER_STR_VAL]; 966 int len; 967 int field_len; 968 regex_match_func match; 969 }; 970 971 struct filter_pred { 972 filter_pred_fn_t fn; 973 u64 val; 974 struct regex regex; 975 unsigned short *ops; 976 struct ftrace_event_field *field; 977 int offset; 978 int not; 979 int op; 980 unsigned short index; 981 unsigned short parent; 982 unsigned short left; 983 unsigned short right; 984 }; 985 986 extern enum regex_type 987 filter_parse_regex(char *buff, int len, char **search, int *not); 988 extern void print_event_filter(struct ftrace_event_call *call, 989 struct trace_seq *s); 990 extern int apply_event_filter(struct ftrace_event_call *call, 991 char *filter_string); 992 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir, 993 char *filter_string); 994 extern void print_subsystem_event_filter(struct event_subsystem *system, 995 struct trace_seq *s); 996 extern int filter_assign_type(const char *type); 997 998 struct ftrace_event_field * 999 trace_find_event_field(struct ftrace_event_call *call, char *name); 1000 1001 static inline int 1002 filter_check_discard(struct ftrace_event_call *call, void *rec, 1003 struct ring_buffer *buffer, 1004 struct ring_buffer_event *event) 1005 { 1006 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && 1007 !filter_match_preds(call->filter, rec)) { 1008 ring_buffer_discard_commit(buffer, event); 1009 return 1; 1010 } 1011 1012 return 0; 1013 } 1014 1015 extern void trace_event_enable_cmd_record(bool enable); 1016 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1017 extern int event_trace_del_tracer(struct trace_array *tr); 1018 1019 extern struct mutex event_mutex; 1020 extern struct list_head ftrace_events; 1021 1022 extern const char *__start___trace_bprintk_fmt[]; 1023 extern const char *__stop___trace_bprintk_fmt[]; 1024 1025 void trace_printk_init_buffers(void); 1026 void trace_printk_start_comm(void); 1027 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1028 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1029 1030 /* 1031 * Normal trace_printk() and friends allocates special buffers 1032 * to do the manipulation, as well as saves the print formats 1033 * into sections to display. But the trace infrastructure wants 1034 * to use these without the added overhead at the price of being 1035 * a bit slower (used mainly for warnings, where we don't care 1036 * about performance). The internal_trace_puts() is for such 1037 * a purpose. 1038 */ 1039 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1040 1041 #undef FTRACE_ENTRY 1042 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1043 extern struct ftrace_event_call \ 1044 __attribute__((__aligned__(4))) event_##call; 1045 #undef FTRACE_ENTRY_DUP 1046 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1047 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1048 filter) 1049 #include "trace_entries.h" 1050 1051 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1052 int perf_ftrace_event_register(struct ftrace_event_call *call, 1053 enum trace_reg type, void *data); 1054 #else 1055 #define perf_ftrace_event_register NULL 1056 #endif 1057 1058 #endif /* _LINUX_KERNEL_TRACE_H */ 1059