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 struct tracer *next; 287 struct tracer_flags *flags; 288 bool print_max; 289 bool use_max_tr; 290 bool allocated_snapshot; 291 }; 292 293 294 /* Only current can touch trace_recursion */ 295 296 /* 297 * For function tracing recursion: 298 * The order of these bits are important. 299 * 300 * When function tracing occurs, the following steps are made: 301 * If arch does not support a ftrace feature: 302 * call internal function (uses INTERNAL bits) which calls... 303 * If callback is registered to the "global" list, the list 304 * function is called and recursion checks the GLOBAL bits. 305 * then this function calls... 306 * The function callback, which can use the FTRACE bits to 307 * check for recursion. 308 * 309 * Now if the arch does not suppport a feature, and it calls 310 * the global list function which calls the ftrace callback 311 * all three of these steps will do a recursion protection. 312 * There's no reason to do one if the previous caller already 313 * did. The recursion that we are protecting against will 314 * go through the same steps again. 315 * 316 * To prevent the multiple recursion checks, if a recursion 317 * bit is set that is higher than the MAX bit of the current 318 * check, then we know that the check was made by the previous 319 * caller, and we can skip the current check. 320 */ 321 enum { 322 TRACE_BUFFER_BIT, 323 TRACE_BUFFER_NMI_BIT, 324 TRACE_BUFFER_IRQ_BIT, 325 TRACE_BUFFER_SIRQ_BIT, 326 327 /* Start of function recursion bits */ 328 TRACE_FTRACE_BIT, 329 TRACE_FTRACE_NMI_BIT, 330 TRACE_FTRACE_IRQ_BIT, 331 TRACE_FTRACE_SIRQ_BIT, 332 333 /* GLOBAL_BITs must be greater than FTRACE_BITs */ 334 TRACE_GLOBAL_BIT, 335 TRACE_GLOBAL_NMI_BIT, 336 TRACE_GLOBAL_IRQ_BIT, 337 TRACE_GLOBAL_SIRQ_BIT, 338 339 /* INTERNAL_BITs must be greater than GLOBAL_BITs */ 340 TRACE_INTERNAL_BIT, 341 TRACE_INTERNAL_NMI_BIT, 342 TRACE_INTERNAL_IRQ_BIT, 343 TRACE_INTERNAL_SIRQ_BIT, 344 345 TRACE_CONTROL_BIT, 346 347 /* 348 * Abuse of the trace_recursion. 349 * As we need a way to maintain state if we are tracing the function 350 * graph in irq because we want to trace a particular function that 351 * was called in irq context but we have irq tracing off. Since this 352 * can only be modified by current, we can reuse trace_recursion. 353 */ 354 TRACE_IRQ_BIT, 355 }; 356 357 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 358 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 359 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 360 361 #define TRACE_CONTEXT_BITS 4 362 363 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 364 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 365 366 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT 367 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1) 368 369 #define TRACE_LIST_START TRACE_INTERNAL_BIT 370 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 371 372 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 373 374 static __always_inline int trace_get_context_bit(void) 375 { 376 int bit; 377 378 if (in_interrupt()) { 379 if (in_nmi()) 380 bit = 0; 381 382 else if (in_irq()) 383 bit = 1; 384 else 385 bit = 2; 386 } else 387 bit = 3; 388 389 return bit; 390 } 391 392 static __always_inline int trace_test_and_set_recursion(int start, int max) 393 { 394 unsigned int val = current->trace_recursion; 395 int bit; 396 397 /* A previous recursion check was made */ 398 if ((val & TRACE_CONTEXT_MASK) > max) 399 return 0; 400 401 bit = trace_get_context_bit() + start; 402 if (unlikely(val & (1 << bit))) 403 return -1; 404 405 val |= 1 << bit; 406 current->trace_recursion = val; 407 barrier(); 408 409 return bit; 410 } 411 412 static __always_inline void trace_clear_recursion(int bit) 413 { 414 unsigned int val = current->trace_recursion; 415 416 if (!bit) 417 return; 418 419 bit = 1 << bit; 420 val &= ~bit; 421 422 barrier(); 423 current->trace_recursion = val; 424 } 425 426 #define TRACE_PIPE_ALL_CPU -1 427 428 static inline struct ring_buffer_iter * 429 trace_buffer_iter(struct trace_iterator *iter, int cpu) 430 { 431 if (iter->buffer_iter && iter->buffer_iter[cpu]) 432 return iter->buffer_iter[cpu]; 433 return NULL; 434 } 435 436 int tracer_init(struct tracer *t, struct trace_array *tr); 437 int tracing_is_enabled(void); 438 void tracing_reset(struct trace_array *tr, int cpu); 439 void tracing_reset_online_cpus(struct trace_array *tr); 440 void tracing_reset_current(int cpu); 441 void tracing_reset_current_online_cpus(void); 442 int tracing_open_generic(struct inode *inode, struct file *filp); 443 struct dentry *trace_create_file(const char *name, 444 umode_t mode, 445 struct dentry *parent, 446 void *data, 447 const struct file_operations *fops); 448 449 struct dentry *tracing_init_dentry(void); 450 451 struct ring_buffer_event; 452 453 struct ring_buffer_event * 454 trace_buffer_lock_reserve(struct ring_buffer *buffer, 455 int type, 456 unsigned long len, 457 unsigned long flags, 458 int pc); 459 460 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 461 struct trace_array_cpu *data); 462 463 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 464 int *ent_cpu, u64 *ent_ts); 465 466 void __buffer_unlock_commit(struct ring_buffer *buffer, 467 struct ring_buffer_event *event); 468 469 int trace_empty(struct trace_iterator *iter); 470 471 void *trace_find_next_entry_inc(struct trace_iterator *iter); 472 473 void trace_init_global_iter(struct trace_iterator *iter); 474 475 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 476 477 void poll_wait_pipe(struct trace_iterator *iter); 478 479 void ftrace(struct trace_array *tr, 480 struct trace_array_cpu *data, 481 unsigned long ip, 482 unsigned long parent_ip, 483 unsigned long flags, int pc); 484 void tracing_sched_switch_trace(struct trace_array *tr, 485 struct task_struct *prev, 486 struct task_struct *next, 487 unsigned long flags, int pc); 488 489 void tracing_sched_wakeup_trace(struct trace_array *tr, 490 struct task_struct *wakee, 491 struct task_struct *cur, 492 unsigned long flags, int pc); 493 void trace_function(struct trace_array *tr, 494 unsigned long ip, 495 unsigned long parent_ip, 496 unsigned long flags, int pc); 497 void trace_graph_function(struct trace_array *tr, 498 unsigned long ip, 499 unsigned long parent_ip, 500 unsigned long flags, int pc); 501 void trace_latency_header(struct seq_file *m); 502 void trace_default_header(struct seq_file *m); 503 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 504 int trace_empty(struct trace_iterator *iter); 505 506 void trace_graph_return(struct ftrace_graph_ret *trace); 507 int trace_graph_entry(struct ftrace_graph_ent *trace); 508 void set_graph_array(struct trace_array *tr); 509 510 void tracing_start_cmdline_record(void); 511 void tracing_stop_cmdline_record(void); 512 void tracing_sched_switch_assign_trace(struct trace_array *tr); 513 void tracing_stop_sched_switch_record(void); 514 void tracing_start_sched_switch_record(void); 515 int register_tracer(struct tracer *type); 516 int is_tracing_stopped(void); 517 518 extern cpumask_var_t __read_mostly tracing_buffer_mask; 519 520 #define for_each_tracing_cpu(cpu) \ 521 for_each_cpu(cpu, tracing_buffer_mask) 522 523 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 524 525 extern unsigned long tracing_thresh; 526 527 #ifdef CONFIG_TRACER_MAX_TRACE 528 extern unsigned long tracing_max_latency; 529 530 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 531 void update_max_tr_single(struct trace_array *tr, 532 struct task_struct *tsk, int cpu); 533 #endif /* CONFIG_TRACER_MAX_TRACE */ 534 535 #ifdef CONFIG_STACKTRACE 536 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 537 int skip, int pc); 538 539 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, 540 int skip, int pc, struct pt_regs *regs); 541 542 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 543 int pc); 544 545 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 546 int pc); 547 #else 548 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 549 unsigned long flags, int skip, int pc) 550 { 551 } 552 553 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, 554 unsigned long flags, int skip, 555 int pc, struct pt_regs *regs) 556 { 557 } 558 559 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 560 unsigned long flags, int pc) 561 { 562 } 563 564 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 565 int skip, int pc) 566 { 567 } 568 #endif /* CONFIG_STACKTRACE */ 569 570 extern cycle_t ftrace_now(int cpu); 571 572 extern void trace_find_cmdline(int pid, char comm[]); 573 574 #ifdef CONFIG_DYNAMIC_FTRACE 575 extern unsigned long ftrace_update_tot_cnt; 576 #endif 577 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 578 extern int DYN_FTRACE_TEST_NAME(void); 579 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 580 extern int DYN_FTRACE_TEST_NAME2(void); 581 582 extern int ring_buffer_expanded; 583 extern bool tracing_selftest_disabled; 584 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 585 586 #ifdef CONFIG_FTRACE_STARTUP_TEST 587 extern int trace_selftest_startup_function(struct tracer *trace, 588 struct trace_array *tr); 589 extern int trace_selftest_startup_function_graph(struct tracer *trace, 590 struct trace_array *tr); 591 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 592 struct trace_array *tr); 593 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 594 struct trace_array *tr); 595 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 596 struct trace_array *tr); 597 extern int trace_selftest_startup_wakeup(struct tracer *trace, 598 struct trace_array *tr); 599 extern int trace_selftest_startup_nop(struct tracer *trace, 600 struct trace_array *tr); 601 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 602 struct trace_array *tr); 603 extern int trace_selftest_startup_branch(struct tracer *trace, 604 struct trace_array *tr); 605 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 606 607 extern void *head_page(struct trace_array_cpu *data); 608 extern unsigned long long ns2usecs(cycle_t nsec); 609 extern int 610 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 611 extern int 612 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 613 extern int 614 trace_array_vprintk(struct trace_array *tr, 615 unsigned long ip, const char *fmt, va_list args); 616 int trace_array_printk(struct trace_array *tr, 617 unsigned long ip, const char *fmt, ...); 618 void trace_printk_seq(struct trace_seq *s); 619 enum print_line_t print_trace_line(struct trace_iterator *iter); 620 621 extern unsigned long trace_flags; 622 623 extern int trace_clock_id; 624 625 /* Standard output formatting function used for function return traces */ 626 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 627 628 /* Flag options */ 629 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 630 #define TRACE_GRAPH_PRINT_CPU 0x2 631 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 632 #define TRACE_GRAPH_PRINT_PROC 0x8 633 #define TRACE_GRAPH_PRINT_DURATION 0x10 634 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 635 636 extern enum print_line_t 637 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 638 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 639 extern enum print_line_t 640 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 641 extern void graph_trace_open(struct trace_iterator *iter); 642 extern void graph_trace_close(struct trace_iterator *iter); 643 extern int __trace_graph_entry(struct trace_array *tr, 644 struct ftrace_graph_ent *trace, 645 unsigned long flags, int pc); 646 extern void __trace_graph_return(struct trace_array *tr, 647 struct ftrace_graph_ret *trace, 648 unsigned long flags, int pc); 649 650 651 #ifdef CONFIG_DYNAMIC_FTRACE 652 /* TODO: make this variable */ 653 #define FTRACE_GRAPH_MAX_FUNCS 32 654 extern int ftrace_graph_filter_enabled; 655 extern int ftrace_graph_count; 656 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 657 658 static inline int ftrace_graph_addr(unsigned long addr) 659 { 660 int i; 661 662 if (!ftrace_graph_filter_enabled) 663 return 1; 664 665 for (i = 0; i < ftrace_graph_count; i++) { 666 if (addr == ftrace_graph_funcs[i]) { 667 /* 668 * If no irqs are to be traced, but a set_graph_function 669 * is set, and called by an interrupt handler, we still 670 * want to trace it. 671 */ 672 if (in_irq()) 673 trace_recursion_set(TRACE_IRQ_BIT); 674 else 675 trace_recursion_clear(TRACE_IRQ_BIT); 676 return 1; 677 } 678 } 679 680 return 0; 681 } 682 #else 683 static inline int ftrace_graph_addr(unsigned long addr) 684 { 685 return 1; 686 } 687 #endif /* CONFIG_DYNAMIC_FTRACE */ 688 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 689 static inline enum print_line_t 690 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 691 { 692 return TRACE_TYPE_UNHANDLED; 693 } 694 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 695 696 extern struct list_head ftrace_pids; 697 698 #ifdef CONFIG_FUNCTION_TRACER 699 static inline int ftrace_trace_task(struct task_struct *task) 700 { 701 if (list_empty(&ftrace_pids)) 702 return 1; 703 704 return test_tsk_trace_trace(task); 705 } 706 extern int ftrace_is_dead(void); 707 #else 708 static inline int ftrace_trace_task(struct task_struct *task) 709 { 710 return 1; 711 } 712 static inline int ftrace_is_dead(void) { return 0; } 713 #endif 714 715 int ftrace_event_is_function(struct ftrace_event_call *call); 716 717 /* 718 * struct trace_parser - servers for reading the user input separated by spaces 719 * @cont: set if the input is not complete - no final space char was found 720 * @buffer: holds the parsed user input 721 * @idx: user input length 722 * @size: buffer size 723 */ 724 struct trace_parser { 725 bool cont; 726 char *buffer; 727 unsigned idx; 728 unsigned size; 729 }; 730 731 static inline bool trace_parser_loaded(struct trace_parser *parser) 732 { 733 return (parser->idx != 0); 734 } 735 736 static inline bool trace_parser_cont(struct trace_parser *parser) 737 { 738 return parser->cont; 739 } 740 741 static inline void trace_parser_clear(struct trace_parser *parser) 742 { 743 parser->cont = false; 744 parser->idx = 0; 745 } 746 747 extern int trace_parser_get_init(struct trace_parser *parser, int size); 748 extern void trace_parser_put(struct trace_parser *parser); 749 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 750 size_t cnt, loff_t *ppos); 751 752 /* 753 * trace_iterator_flags is an enumeration that defines bit 754 * positions into trace_flags that controls the output. 755 * 756 * NOTE: These bits must match the trace_options array in 757 * trace.c. 758 */ 759 enum trace_iterator_flags { 760 TRACE_ITER_PRINT_PARENT = 0x01, 761 TRACE_ITER_SYM_OFFSET = 0x02, 762 TRACE_ITER_SYM_ADDR = 0x04, 763 TRACE_ITER_VERBOSE = 0x08, 764 TRACE_ITER_RAW = 0x10, 765 TRACE_ITER_HEX = 0x20, 766 TRACE_ITER_BIN = 0x40, 767 TRACE_ITER_BLOCK = 0x80, 768 TRACE_ITER_STACKTRACE = 0x100, 769 TRACE_ITER_PRINTK = 0x200, 770 TRACE_ITER_PREEMPTONLY = 0x400, 771 TRACE_ITER_BRANCH = 0x800, 772 TRACE_ITER_ANNOTATE = 0x1000, 773 TRACE_ITER_USERSTACKTRACE = 0x2000, 774 TRACE_ITER_SYM_USEROBJ = 0x4000, 775 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 776 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 777 TRACE_ITER_LATENCY_FMT = 0x20000, 778 TRACE_ITER_SLEEP_TIME = 0x40000, 779 TRACE_ITER_GRAPH_TIME = 0x80000, 780 TRACE_ITER_RECORD_CMD = 0x100000, 781 TRACE_ITER_OVERWRITE = 0x200000, 782 TRACE_ITER_STOP_ON_FREE = 0x400000, 783 TRACE_ITER_IRQ_INFO = 0x800000, 784 TRACE_ITER_MARKERS = 0x1000000, 785 }; 786 787 /* 788 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 789 * control the output of kernel symbols. 790 */ 791 #define TRACE_ITER_SYM_MASK \ 792 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 793 794 extern struct tracer nop_trace; 795 796 #ifdef CONFIG_BRANCH_TRACER 797 extern int enable_branch_tracing(struct trace_array *tr); 798 extern void disable_branch_tracing(void); 799 static inline int trace_branch_enable(struct trace_array *tr) 800 { 801 if (trace_flags & TRACE_ITER_BRANCH) 802 return enable_branch_tracing(tr); 803 return 0; 804 } 805 static inline void trace_branch_disable(void) 806 { 807 /* due to races, always disable */ 808 disable_branch_tracing(); 809 } 810 #else 811 static inline int trace_branch_enable(struct trace_array *tr) 812 { 813 return 0; 814 } 815 static inline void trace_branch_disable(void) 816 { 817 } 818 #endif /* CONFIG_BRANCH_TRACER */ 819 820 /* set ring buffers to default size if not already done so */ 821 int tracing_update_buffers(void); 822 823 /* trace event type bit fields, not numeric */ 824 enum { 825 TRACE_EVENT_TYPE_PRINTF = 1, 826 TRACE_EVENT_TYPE_RAW = 2, 827 }; 828 829 struct ftrace_event_field { 830 struct list_head link; 831 char *name; 832 char *type; 833 int filter_type; 834 int offset; 835 int size; 836 int is_signed; 837 }; 838 839 struct event_filter { 840 int n_preds; /* Number assigned */ 841 int a_preds; /* allocated */ 842 struct filter_pred *preds; 843 struct filter_pred *root; 844 char *filter_string; 845 }; 846 847 struct event_subsystem { 848 struct list_head list; 849 const char *name; 850 struct dentry *entry; 851 struct event_filter *filter; 852 int nr_events; 853 int ref_count; 854 }; 855 856 #define FILTER_PRED_INVALID ((unsigned short)-1) 857 #define FILTER_PRED_IS_RIGHT (1 << 15) 858 #define FILTER_PRED_FOLD (1 << 15) 859 860 /* 861 * The max preds is the size of unsigned short with 862 * two flags at the MSBs. One bit is used for both the IS_RIGHT 863 * and FOLD flags. The other is reserved. 864 * 865 * 2^14 preds is way more than enough. 866 */ 867 #define MAX_FILTER_PRED 16384 868 869 struct filter_pred; 870 struct regex; 871 872 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 873 874 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 875 876 enum regex_type { 877 MATCH_FULL = 0, 878 MATCH_FRONT_ONLY, 879 MATCH_MIDDLE_ONLY, 880 MATCH_END_ONLY, 881 }; 882 883 struct regex { 884 char pattern[MAX_FILTER_STR_VAL]; 885 int len; 886 int field_len; 887 regex_match_func match; 888 }; 889 890 struct filter_pred { 891 filter_pred_fn_t fn; 892 u64 val; 893 struct regex regex; 894 unsigned short *ops; 895 struct ftrace_event_field *field; 896 int offset; 897 int not; 898 int op; 899 unsigned short index; 900 unsigned short parent; 901 unsigned short left; 902 unsigned short right; 903 }; 904 905 extern struct list_head ftrace_common_fields; 906 907 extern enum regex_type 908 filter_parse_regex(char *buff, int len, char **search, int *not); 909 extern void print_event_filter(struct ftrace_event_call *call, 910 struct trace_seq *s); 911 extern int apply_event_filter(struct ftrace_event_call *call, 912 char *filter_string); 913 extern int apply_subsystem_event_filter(struct event_subsystem *system, 914 char *filter_string); 915 extern void print_subsystem_event_filter(struct event_subsystem *system, 916 struct trace_seq *s); 917 extern int filter_assign_type(const char *type); 918 919 struct list_head * 920 trace_get_fields(struct ftrace_event_call *event_call); 921 922 static inline int 923 filter_check_discard(struct ftrace_event_call *call, void *rec, 924 struct ring_buffer *buffer, 925 struct ring_buffer_event *event) 926 { 927 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && 928 !filter_match_preds(call->filter, rec)) { 929 ring_buffer_discard_commit(buffer, event); 930 return 1; 931 } 932 933 return 0; 934 } 935 936 extern void trace_event_enable_cmd_record(bool enable); 937 938 extern struct mutex event_mutex; 939 extern struct list_head ftrace_events; 940 941 extern const char *__start___trace_bprintk_fmt[]; 942 extern const char *__stop___trace_bprintk_fmt[]; 943 944 void trace_printk_init_buffers(void); 945 void trace_printk_start_comm(void); 946 947 #undef FTRACE_ENTRY 948 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 949 extern struct ftrace_event_call \ 950 __attribute__((__aligned__(4))) event_##call; 951 #undef FTRACE_ENTRY_DUP 952 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 953 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 954 filter) 955 #include "trace_entries.h" 956 957 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 958 int perf_ftrace_event_register(struct ftrace_event_call *call, 959 enum trace_reg type, void *data); 960 #else 961 #define perf_ftrace_event_register NULL 962 #endif 963 964 #endif /* _LINUX_KERNEL_TRACE_H */ 965