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