1 #ifndef _LINUX_KERNEL_TRACE_H 2 #define _LINUX_KERNEL_TRACE_H 3 4 #include <linux/fs.h> 5 #include <linux/atomic.h> 6 #include <linux/sched.h> 7 #include <linux/clocksource.h> 8 #include <linux/ring_buffer.h> 9 #include <linux/mmiotrace.h> 10 #include <linux/tracepoint.h> 11 #include <linux/ftrace.h> 12 #include <linux/hw_breakpoint.h> 13 #include <linux/trace_seq.h> 14 #include <linux/ftrace_event.h> 15 16 #ifdef CONFIG_FTRACE_SYSCALLS 17 #include <asm/unistd.h> /* For NR_SYSCALLS */ 18 #include <asm/syscall.h> /* some archs define it here */ 19 #endif 20 21 enum trace_type { 22 __TRACE_FIRST_TYPE = 0, 23 24 TRACE_FN, 25 TRACE_CTX, 26 TRACE_WAKE, 27 TRACE_STACK, 28 TRACE_PRINT, 29 TRACE_BPRINT, 30 TRACE_MMIO_RW, 31 TRACE_MMIO_MAP, 32 TRACE_BRANCH, 33 TRACE_GRAPH_RET, 34 TRACE_GRAPH_ENT, 35 TRACE_USER_STACK, 36 TRACE_BLK, 37 TRACE_BPUTS, 38 39 __TRACE_LAST_TYPE, 40 }; 41 42 43 #undef __field 44 #define __field(type, item) type item; 45 46 #undef __field_struct 47 #define __field_struct(type, item) __field(type, item) 48 49 #undef __field_desc 50 #define __field_desc(type, container, item) 51 52 #undef __array 53 #define __array(type, item, size) type item[size]; 54 55 #undef __array_desc 56 #define __array_desc(type, container, item, size) 57 58 #undef __dynamic_array 59 #define __dynamic_array(type, item) type item[]; 60 61 #undef F_STRUCT 62 #define F_STRUCT(args...) args 63 64 #undef FTRACE_ENTRY 65 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ 66 struct struct_name { \ 67 struct trace_entry ent; \ 68 tstruct \ 69 } 70 71 #undef TP_ARGS 72 #define TP_ARGS(args...) args 73 74 #undef FTRACE_ENTRY_DUP 75 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) 76 77 #undef FTRACE_ENTRY_REG 78 #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ 79 filter, regfn) \ 80 FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 81 filter) 82 83 #include "trace_entries.h" 84 85 /* 86 * syscalls are special, and need special handling, this is why 87 * they are not included in trace_entries.h 88 */ 89 struct syscall_trace_enter { 90 struct trace_entry ent; 91 int nr; 92 unsigned long args[]; 93 }; 94 95 struct syscall_trace_exit { 96 struct trace_entry ent; 97 int nr; 98 long ret; 99 }; 100 101 struct kprobe_trace_entry_head { 102 struct trace_entry ent; 103 unsigned long ip; 104 }; 105 106 struct kretprobe_trace_entry_head { 107 struct trace_entry ent; 108 unsigned long func; 109 unsigned long ret_ip; 110 }; 111 112 /* 113 * trace_flag_type is an enumeration that holds different 114 * states when a trace occurs. These are: 115 * IRQS_OFF - interrupts were disabled 116 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags 117 * NEED_RESCHED - reschedule is requested 118 * HARDIRQ - inside an interrupt handler 119 * SOFTIRQ - inside a softirq handler 120 */ 121 enum trace_flag_type { 122 TRACE_FLAG_IRQS_OFF = 0x01, 123 TRACE_FLAG_IRQS_NOSUPPORT = 0x02, 124 TRACE_FLAG_NEED_RESCHED = 0x04, 125 TRACE_FLAG_HARDIRQ = 0x08, 126 TRACE_FLAG_SOFTIRQ = 0x10, 127 TRACE_FLAG_PREEMPT_RESCHED = 0x20, 128 }; 129 130 #define TRACE_BUF_SIZE 1024 131 132 struct trace_array; 133 134 /* 135 * The CPU trace array - it consists of thousands of trace entries 136 * plus some other descriptor data: (for example which task started 137 * the trace, etc.) 138 */ 139 struct trace_array_cpu { 140 atomic_t disabled; 141 void *buffer_page; /* ring buffer spare */ 142 143 unsigned long entries; 144 unsigned long saved_latency; 145 unsigned long critical_start; 146 unsigned long critical_end; 147 unsigned long critical_sequence; 148 unsigned long nice; 149 unsigned long policy; 150 unsigned long rt_priority; 151 unsigned long skipped_entries; 152 cycle_t preempt_timestamp; 153 pid_t pid; 154 kuid_t uid; 155 char comm[TASK_COMM_LEN]; 156 }; 157 158 struct tracer; 159 160 struct trace_buffer { 161 struct trace_array *tr; 162 struct ring_buffer *buffer; 163 struct trace_array_cpu __percpu *data; 164 cycle_t time_start; 165 int cpu; 166 }; 167 168 /* 169 * The trace array - an array of per-CPU trace arrays. This is the 170 * highest level data structure that individual tracers deal with. 171 * They have on/off state as well: 172 */ 173 struct trace_array { 174 struct list_head list; 175 char *name; 176 struct trace_buffer trace_buffer; 177 #ifdef CONFIG_TRACER_MAX_TRACE 178 /* 179 * The max_buffer is used to snapshot the trace when a maximum 180 * latency is reached, or when the user initiates a snapshot. 181 * Some tracers will use this to store a maximum trace while 182 * it continues examining live traces. 183 * 184 * The buffers for the max_buffer are set up the same as the trace_buffer 185 * When a snapshot is taken, the buffer of the max_buffer is swapped 186 * with the buffer of the trace_buffer and the buffers are reset for 187 * the trace_buffer so the tracing can continue. 188 */ 189 struct trace_buffer max_buffer; 190 bool allocated_snapshot; 191 #endif 192 int buffer_disabled; 193 #ifdef CONFIG_FTRACE_SYSCALLS 194 int sys_refcount_enter; 195 int sys_refcount_exit; 196 struct ftrace_event_file __rcu *enter_syscall_files[NR_syscalls]; 197 struct ftrace_event_file __rcu *exit_syscall_files[NR_syscalls]; 198 #endif 199 int stop_count; 200 int clock_id; 201 struct tracer *current_trace; 202 unsigned int flags; 203 raw_spinlock_t start_lock; 204 struct dentry *dir; 205 struct dentry *options; 206 struct dentry *percpu_dir; 207 struct dentry *event_dir; 208 struct list_head systems; 209 struct list_head events; 210 cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ 211 int ref; 212 }; 213 214 enum { 215 TRACE_ARRAY_FL_GLOBAL = (1 << 0) 216 }; 217 218 extern struct list_head ftrace_trace_arrays; 219 220 extern struct mutex trace_types_lock; 221 222 extern int trace_array_get(struct trace_array *tr); 223 extern void trace_array_put(struct trace_array *tr); 224 225 /* 226 * The global tracer (top) should be the first trace array added, 227 * but we check the flag anyway. 228 */ 229 static inline struct trace_array *top_trace_array(void) 230 { 231 struct trace_array *tr; 232 233 tr = list_entry(ftrace_trace_arrays.prev, 234 typeof(*tr), list); 235 WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); 236 return tr; 237 } 238 239 #define FTRACE_CMP_TYPE(var, type) \ 240 __builtin_types_compatible_p(typeof(var), type *) 241 242 #undef IF_ASSIGN 243 #define IF_ASSIGN(var, entry, etype, id) \ 244 if (FTRACE_CMP_TYPE(var, etype)) { \ 245 var = (typeof(var))(entry); \ 246 WARN_ON(id && (entry)->type != id); \ 247 break; \ 248 } 249 250 /* Will cause compile errors if type is not found. */ 251 extern void __ftrace_bad_type(void); 252 253 /* 254 * The trace_assign_type is a verifier that the entry type is 255 * the same as the type being assigned. To add new types simply 256 * add a line with the following format: 257 * 258 * IF_ASSIGN(var, ent, type, id); 259 * 260 * Where "type" is the trace type that includes the trace_entry 261 * as the "ent" item. And "id" is the trace identifier that is 262 * used in the trace_type enum. 263 * 264 * If the type can have more than one id, then use zero. 265 */ 266 #define trace_assign_type(var, ent) \ 267 do { \ 268 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ 269 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ 270 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ 271 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ 272 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ 273 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ 274 IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ 275 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ 276 TRACE_MMIO_RW); \ 277 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ 278 TRACE_MMIO_MAP); \ 279 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ 280 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ 281 TRACE_GRAPH_ENT); \ 282 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ 283 TRACE_GRAPH_RET); \ 284 __ftrace_bad_type(); \ 285 } while (0) 286 287 /* 288 * An option specific to a tracer. This is a boolean value. 289 * The bit is the bit index that sets its value on the 290 * flags value in struct tracer_flags. 291 */ 292 struct tracer_opt { 293 const char *name; /* Will appear on the trace_options file */ 294 u32 bit; /* Mask assigned in val field in tracer_flags */ 295 }; 296 297 /* 298 * The set of specific options for a tracer. Your tracer 299 * have to set the initial value of the flags val. 300 */ 301 struct tracer_flags { 302 u32 val; 303 struct tracer_opt *opts; 304 }; 305 306 /* Makes more easy to define a tracer opt */ 307 #define TRACER_OPT(s, b) .name = #s, .bit = b 308 309 310 /** 311 * struct tracer - a specific tracer and its callbacks to interact with debugfs 312 * @name: the name chosen to select it on the available_tracers file 313 * @init: called when one switches to this tracer (echo name > current_tracer) 314 * @reset: called when one switches to another tracer 315 * @start: called when tracing is unpaused (echo 1 > tracing_enabled) 316 * @stop: called when tracing is paused (echo 0 > tracing_enabled) 317 * @open: called when the trace file is opened 318 * @pipe_open: called when the trace_pipe file is opened 319 * @wait_pipe: override how the user waits for traces on trace_pipe 320 * @close: called when the trace file is released 321 * @pipe_close: called when the trace_pipe file is released 322 * @read: override the default read callback on trace_pipe 323 * @splice_read: override the default splice_read callback on trace_pipe 324 * @selftest: selftest to run on boot (see trace_selftest.c) 325 * @print_headers: override the first lines that describe your columns 326 * @print_line: callback that prints a trace 327 * @set_flag: signals one of your private flags changed (trace_options file) 328 * @flags: your private flags 329 */ 330 struct tracer { 331 const char *name; 332 int (*init)(struct trace_array *tr); 333 void (*reset)(struct trace_array *tr); 334 void (*start)(struct trace_array *tr); 335 void (*stop)(struct trace_array *tr); 336 void (*open)(struct trace_iterator *iter); 337 void (*pipe_open)(struct trace_iterator *iter); 338 void (*wait_pipe)(struct trace_iterator *iter); 339 void (*close)(struct trace_iterator *iter); 340 void (*pipe_close)(struct trace_iterator *iter); 341 ssize_t (*read)(struct trace_iterator *iter, 342 struct file *filp, char __user *ubuf, 343 size_t cnt, loff_t *ppos); 344 ssize_t (*splice_read)(struct trace_iterator *iter, 345 struct file *filp, 346 loff_t *ppos, 347 struct pipe_inode_info *pipe, 348 size_t len, 349 unsigned int flags); 350 #ifdef CONFIG_FTRACE_STARTUP_TEST 351 int (*selftest)(struct tracer *trace, 352 struct trace_array *tr); 353 #endif 354 void (*print_header)(struct seq_file *m); 355 enum print_line_t (*print_line)(struct trace_iterator *iter); 356 /* If you handled the flag setting, return 0 */ 357 int (*set_flag)(u32 old_flags, u32 bit, int set); 358 /* Return 0 if OK with change, else return non-zero */ 359 int (*flag_changed)(struct tracer *tracer, 360 u32 mask, int set); 361 struct tracer *next; 362 struct tracer_flags *flags; 363 bool print_max; 364 bool enabled; 365 #ifdef CONFIG_TRACER_MAX_TRACE 366 bool use_max_tr; 367 #endif 368 }; 369 370 371 /* Only current can touch trace_recursion */ 372 373 /* 374 * For function tracing recursion: 375 * The order of these bits are important. 376 * 377 * When function tracing occurs, the following steps are made: 378 * If arch does not support a ftrace feature: 379 * call internal function (uses INTERNAL bits) which calls... 380 * If callback is registered to the "global" list, the list 381 * function is called and recursion checks the GLOBAL bits. 382 * then this function calls... 383 * The function callback, which can use the FTRACE bits to 384 * check for recursion. 385 * 386 * Now if the arch does not suppport a feature, and it calls 387 * the global list function which calls the ftrace callback 388 * all three of these steps will do a recursion protection. 389 * There's no reason to do one if the previous caller already 390 * did. The recursion that we are protecting against will 391 * go through the same steps again. 392 * 393 * To prevent the multiple recursion checks, if a recursion 394 * bit is set that is higher than the MAX bit of the current 395 * check, then we know that the check was made by the previous 396 * caller, and we can skip the current check. 397 */ 398 enum { 399 TRACE_BUFFER_BIT, 400 TRACE_BUFFER_NMI_BIT, 401 TRACE_BUFFER_IRQ_BIT, 402 TRACE_BUFFER_SIRQ_BIT, 403 404 /* Start of function recursion bits */ 405 TRACE_FTRACE_BIT, 406 TRACE_FTRACE_NMI_BIT, 407 TRACE_FTRACE_IRQ_BIT, 408 TRACE_FTRACE_SIRQ_BIT, 409 410 /* GLOBAL_BITs must be greater than FTRACE_BITs */ 411 TRACE_GLOBAL_BIT, 412 TRACE_GLOBAL_NMI_BIT, 413 TRACE_GLOBAL_IRQ_BIT, 414 TRACE_GLOBAL_SIRQ_BIT, 415 416 /* INTERNAL_BITs must be greater than GLOBAL_BITs */ 417 TRACE_INTERNAL_BIT, 418 TRACE_INTERNAL_NMI_BIT, 419 TRACE_INTERNAL_IRQ_BIT, 420 TRACE_INTERNAL_SIRQ_BIT, 421 422 TRACE_CONTROL_BIT, 423 424 /* 425 * Abuse of the trace_recursion. 426 * As we need a way to maintain state if we are tracing the function 427 * graph in irq because we want to trace a particular function that 428 * was called in irq context but we have irq tracing off. Since this 429 * can only be modified by current, we can reuse trace_recursion. 430 */ 431 TRACE_IRQ_BIT, 432 }; 433 434 #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) 435 #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) 436 #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) 437 438 #define TRACE_CONTEXT_BITS 4 439 440 #define TRACE_FTRACE_START TRACE_FTRACE_BIT 441 #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) 442 443 #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT 444 #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1) 445 446 #define TRACE_LIST_START TRACE_INTERNAL_BIT 447 #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) 448 449 #define TRACE_CONTEXT_MASK TRACE_LIST_MAX 450 451 static __always_inline int trace_get_context_bit(void) 452 { 453 int bit; 454 455 if (in_interrupt()) { 456 if (in_nmi()) 457 bit = 0; 458 459 else if (in_irq()) 460 bit = 1; 461 else 462 bit = 2; 463 } else 464 bit = 3; 465 466 return bit; 467 } 468 469 static __always_inline int trace_test_and_set_recursion(int start, int max) 470 { 471 unsigned int val = current->trace_recursion; 472 int bit; 473 474 /* A previous recursion check was made */ 475 if ((val & TRACE_CONTEXT_MASK) > max) 476 return 0; 477 478 bit = trace_get_context_bit() + start; 479 if (unlikely(val & (1 << bit))) 480 return -1; 481 482 val |= 1 << bit; 483 current->trace_recursion = val; 484 barrier(); 485 486 return bit; 487 } 488 489 static __always_inline void trace_clear_recursion(int bit) 490 { 491 unsigned int val = current->trace_recursion; 492 493 if (!bit) 494 return; 495 496 bit = 1 << bit; 497 val &= ~bit; 498 499 barrier(); 500 current->trace_recursion = val; 501 } 502 503 static inline struct ring_buffer_iter * 504 trace_buffer_iter(struct trace_iterator *iter, int cpu) 505 { 506 if (iter->buffer_iter && iter->buffer_iter[cpu]) 507 return iter->buffer_iter[cpu]; 508 return NULL; 509 } 510 511 int tracer_init(struct tracer *t, struct trace_array *tr); 512 int tracing_is_enabled(void); 513 void tracing_reset(struct trace_buffer *buf, int cpu); 514 void tracing_reset_online_cpus(struct trace_buffer *buf); 515 void tracing_reset_current(int cpu); 516 void tracing_reset_all_online_cpus(void); 517 int tracing_open_generic(struct inode *inode, struct file *filp); 518 bool tracing_is_disabled(void); 519 struct dentry *trace_create_file(const char *name, 520 umode_t mode, 521 struct dentry *parent, 522 void *data, 523 const struct file_operations *fops); 524 525 struct dentry *tracing_init_dentry_tr(struct trace_array *tr); 526 struct dentry *tracing_init_dentry(void); 527 528 struct ring_buffer_event; 529 530 struct ring_buffer_event * 531 trace_buffer_lock_reserve(struct ring_buffer *buffer, 532 int type, 533 unsigned long len, 534 unsigned long flags, 535 int pc); 536 537 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, 538 struct trace_array_cpu *data); 539 540 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, 541 int *ent_cpu, u64 *ent_ts); 542 543 void __buffer_unlock_commit(struct ring_buffer *buffer, 544 struct ring_buffer_event *event); 545 546 int trace_empty(struct trace_iterator *iter); 547 548 void *trace_find_next_entry_inc(struct trace_iterator *iter); 549 550 void trace_init_global_iter(struct trace_iterator *iter); 551 552 void tracing_iter_reset(struct trace_iterator *iter, int cpu); 553 554 void poll_wait_pipe(struct trace_iterator *iter); 555 556 void tracing_sched_switch_trace(struct trace_array *tr, 557 struct task_struct *prev, 558 struct task_struct *next, 559 unsigned long flags, int pc); 560 561 void tracing_sched_wakeup_trace(struct trace_array *tr, 562 struct task_struct *wakee, 563 struct task_struct *cur, 564 unsigned long flags, int pc); 565 void trace_function(struct trace_array *tr, 566 unsigned long ip, 567 unsigned long parent_ip, 568 unsigned long flags, int pc); 569 void trace_graph_function(struct trace_array *tr, 570 unsigned long ip, 571 unsigned long parent_ip, 572 unsigned long flags, int pc); 573 void trace_latency_header(struct seq_file *m); 574 void trace_default_header(struct seq_file *m); 575 void print_trace_header(struct seq_file *m, struct trace_iterator *iter); 576 int trace_empty(struct trace_iterator *iter); 577 578 void trace_graph_return(struct ftrace_graph_ret *trace); 579 int trace_graph_entry(struct ftrace_graph_ent *trace); 580 void set_graph_array(struct trace_array *tr); 581 582 void tracing_start_cmdline_record(void); 583 void tracing_stop_cmdline_record(void); 584 void tracing_sched_switch_assign_trace(struct trace_array *tr); 585 void tracing_stop_sched_switch_record(void); 586 void tracing_start_sched_switch_record(void); 587 int register_tracer(struct tracer *type); 588 int is_tracing_stopped(void); 589 590 extern cpumask_var_t __read_mostly tracing_buffer_mask; 591 592 #define for_each_tracing_cpu(cpu) \ 593 for_each_cpu(cpu, tracing_buffer_mask) 594 595 extern unsigned long nsecs_to_usecs(unsigned long nsecs); 596 597 extern unsigned long tracing_thresh; 598 599 #ifdef CONFIG_TRACER_MAX_TRACE 600 extern unsigned long tracing_max_latency; 601 602 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); 603 void update_max_tr_single(struct trace_array *tr, 604 struct task_struct *tsk, int cpu); 605 #endif /* CONFIG_TRACER_MAX_TRACE */ 606 607 #ifdef CONFIG_STACKTRACE 608 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, 609 int skip, int pc); 610 611 void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, 612 int skip, int pc, struct pt_regs *regs); 613 614 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, 615 int pc); 616 617 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, 618 int pc); 619 #else 620 static inline void ftrace_trace_stack(struct ring_buffer *buffer, 621 unsigned long flags, int skip, int pc) 622 { 623 } 624 625 static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, 626 unsigned long flags, int skip, 627 int pc, struct pt_regs *regs) 628 { 629 } 630 631 static inline void ftrace_trace_userstack(struct ring_buffer *buffer, 632 unsigned long flags, int pc) 633 { 634 } 635 636 static inline void __trace_stack(struct trace_array *tr, unsigned long flags, 637 int skip, int pc) 638 { 639 } 640 #endif /* CONFIG_STACKTRACE */ 641 642 extern cycle_t ftrace_now(int cpu); 643 644 extern void trace_find_cmdline(int pid, char comm[]); 645 646 #ifdef CONFIG_DYNAMIC_FTRACE 647 extern unsigned long ftrace_update_tot_cnt; 648 #endif 649 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func 650 extern int DYN_FTRACE_TEST_NAME(void); 651 #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 652 extern int DYN_FTRACE_TEST_NAME2(void); 653 654 extern bool ring_buffer_expanded; 655 extern bool tracing_selftest_disabled; 656 DECLARE_PER_CPU(int, ftrace_cpu_disabled); 657 658 #ifdef CONFIG_FTRACE_STARTUP_TEST 659 extern int trace_selftest_startup_function(struct tracer *trace, 660 struct trace_array *tr); 661 extern int trace_selftest_startup_function_graph(struct tracer *trace, 662 struct trace_array *tr); 663 extern int trace_selftest_startup_irqsoff(struct tracer *trace, 664 struct trace_array *tr); 665 extern int trace_selftest_startup_preemptoff(struct tracer *trace, 666 struct trace_array *tr); 667 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, 668 struct trace_array *tr); 669 extern int trace_selftest_startup_wakeup(struct tracer *trace, 670 struct trace_array *tr); 671 extern int trace_selftest_startup_nop(struct tracer *trace, 672 struct trace_array *tr); 673 extern int trace_selftest_startup_sched_switch(struct tracer *trace, 674 struct trace_array *tr); 675 extern int trace_selftest_startup_branch(struct tracer *trace, 676 struct trace_array *tr); 677 /* 678 * Tracer data references selftest functions that only occur 679 * on boot up. These can be __init functions. Thus, when selftests 680 * are enabled, then the tracers need to reference __init functions. 681 */ 682 #define __tracer_data __refdata 683 #else 684 /* Tracers are seldom changed. Optimize when selftests are disabled. */ 685 #define __tracer_data __read_mostly 686 #endif /* CONFIG_FTRACE_STARTUP_TEST */ 687 688 extern void *head_page(struct trace_array_cpu *data); 689 extern unsigned long long ns2usecs(cycle_t nsec); 690 extern int 691 trace_vbprintk(unsigned long ip, const char *fmt, va_list args); 692 extern int 693 trace_vprintk(unsigned long ip, const char *fmt, va_list args); 694 extern int 695 trace_array_vprintk(struct trace_array *tr, 696 unsigned long ip, const char *fmt, va_list args); 697 int trace_array_printk(struct trace_array *tr, 698 unsigned long ip, const char *fmt, ...); 699 int trace_array_printk_buf(struct ring_buffer *buffer, 700 unsigned long ip, const char *fmt, ...); 701 void trace_printk_seq(struct trace_seq *s); 702 enum print_line_t print_trace_line(struct trace_iterator *iter); 703 704 extern unsigned long trace_flags; 705 706 /* Standard output formatting function used for function return traces */ 707 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 708 709 /* Flag options */ 710 #define TRACE_GRAPH_PRINT_OVERRUN 0x1 711 #define TRACE_GRAPH_PRINT_CPU 0x2 712 #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 713 #define TRACE_GRAPH_PRINT_PROC 0x8 714 #define TRACE_GRAPH_PRINT_DURATION 0x10 715 #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 716 #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 717 #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) 718 719 extern enum print_line_t 720 print_graph_function_flags(struct trace_iterator *iter, u32 flags); 721 extern void print_graph_headers_flags(struct seq_file *s, u32 flags); 722 extern enum print_line_t 723 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); 724 extern void graph_trace_open(struct trace_iterator *iter); 725 extern void graph_trace_close(struct trace_iterator *iter); 726 extern int __trace_graph_entry(struct trace_array *tr, 727 struct ftrace_graph_ent *trace, 728 unsigned long flags, int pc); 729 extern void __trace_graph_return(struct trace_array *tr, 730 struct ftrace_graph_ret *trace, 731 unsigned long flags, int pc); 732 733 734 #ifdef CONFIG_DYNAMIC_FTRACE 735 /* TODO: make this variable */ 736 #define FTRACE_GRAPH_MAX_FUNCS 32 737 extern int ftrace_graph_count; 738 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; 739 extern int ftrace_graph_notrace_count; 740 extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; 741 742 static inline int ftrace_graph_addr(unsigned long addr) 743 { 744 int i; 745 746 if (!ftrace_graph_count) 747 return 1; 748 749 for (i = 0; i < ftrace_graph_count; i++) { 750 if (addr == ftrace_graph_funcs[i]) { 751 /* 752 * If no irqs are to be traced, but a set_graph_function 753 * is set, and called by an interrupt handler, we still 754 * want to trace it. 755 */ 756 if (in_irq()) 757 trace_recursion_set(TRACE_IRQ_BIT); 758 else 759 trace_recursion_clear(TRACE_IRQ_BIT); 760 return 1; 761 } 762 } 763 764 return 0; 765 } 766 767 static inline int ftrace_graph_notrace_addr(unsigned long addr) 768 { 769 int i; 770 771 if (!ftrace_graph_notrace_count) 772 return 0; 773 774 for (i = 0; i < ftrace_graph_notrace_count; i++) { 775 if (addr == ftrace_graph_notrace_funcs[i]) 776 return 1; 777 } 778 779 return 0; 780 } 781 #else 782 static inline int ftrace_graph_addr(unsigned long addr) 783 { 784 return 1; 785 } 786 787 static inline int ftrace_graph_notrace_addr(unsigned long addr) 788 { 789 return 0; 790 } 791 #endif /* CONFIG_DYNAMIC_FTRACE */ 792 #else /* CONFIG_FUNCTION_GRAPH_TRACER */ 793 static inline enum print_line_t 794 print_graph_function_flags(struct trace_iterator *iter, u32 flags) 795 { 796 return TRACE_TYPE_UNHANDLED; 797 } 798 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 799 800 extern struct list_head ftrace_pids; 801 802 #ifdef CONFIG_FUNCTION_TRACER 803 extern bool ftrace_filter_param __initdata; 804 static inline int ftrace_trace_task(struct task_struct *task) 805 { 806 if (list_empty(&ftrace_pids)) 807 return 1; 808 809 return test_tsk_trace_trace(task); 810 } 811 extern int ftrace_is_dead(void); 812 #else 813 static inline int ftrace_trace_task(struct task_struct *task) 814 { 815 return 1; 816 } 817 static inline int ftrace_is_dead(void) { return 0; } 818 #endif 819 820 int ftrace_event_is_function(struct ftrace_event_call *call); 821 822 /* 823 * struct trace_parser - servers for reading the user input separated by spaces 824 * @cont: set if the input is not complete - no final space char was found 825 * @buffer: holds the parsed user input 826 * @idx: user input length 827 * @size: buffer size 828 */ 829 struct trace_parser { 830 bool cont; 831 char *buffer; 832 unsigned idx; 833 unsigned size; 834 }; 835 836 static inline bool trace_parser_loaded(struct trace_parser *parser) 837 { 838 return (parser->idx != 0); 839 } 840 841 static inline bool trace_parser_cont(struct trace_parser *parser) 842 { 843 return parser->cont; 844 } 845 846 static inline void trace_parser_clear(struct trace_parser *parser) 847 { 848 parser->cont = false; 849 parser->idx = 0; 850 } 851 852 extern int trace_parser_get_init(struct trace_parser *parser, int size); 853 extern void trace_parser_put(struct trace_parser *parser); 854 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, 855 size_t cnt, loff_t *ppos); 856 857 /* 858 * trace_iterator_flags is an enumeration that defines bit 859 * positions into trace_flags that controls the output. 860 * 861 * NOTE: These bits must match the trace_options array in 862 * trace.c. 863 */ 864 enum trace_iterator_flags { 865 TRACE_ITER_PRINT_PARENT = 0x01, 866 TRACE_ITER_SYM_OFFSET = 0x02, 867 TRACE_ITER_SYM_ADDR = 0x04, 868 TRACE_ITER_VERBOSE = 0x08, 869 TRACE_ITER_RAW = 0x10, 870 TRACE_ITER_HEX = 0x20, 871 TRACE_ITER_BIN = 0x40, 872 TRACE_ITER_BLOCK = 0x80, 873 TRACE_ITER_STACKTRACE = 0x100, 874 TRACE_ITER_PRINTK = 0x200, 875 TRACE_ITER_PREEMPTONLY = 0x400, 876 TRACE_ITER_BRANCH = 0x800, 877 TRACE_ITER_ANNOTATE = 0x1000, 878 TRACE_ITER_USERSTACKTRACE = 0x2000, 879 TRACE_ITER_SYM_USEROBJ = 0x4000, 880 TRACE_ITER_PRINTK_MSGONLY = 0x8000, 881 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ 882 TRACE_ITER_LATENCY_FMT = 0x20000, 883 TRACE_ITER_SLEEP_TIME = 0x40000, 884 TRACE_ITER_GRAPH_TIME = 0x80000, 885 TRACE_ITER_RECORD_CMD = 0x100000, 886 TRACE_ITER_OVERWRITE = 0x200000, 887 TRACE_ITER_STOP_ON_FREE = 0x400000, 888 TRACE_ITER_IRQ_INFO = 0x800000, 889 TRACE_ITER_MARKERS = 0x1000000, 890 TRACE_ITER_FUNCTION = 0x2000000, 891 }; 892 893 /* 894 * TRACE_ITER_SYM_MASK masks the options in trace_flags that 895 * control the output of kernel symbols. 896 */ 897 #define TRACE_ITER_SYM_MASK \ 898 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) 899 900 extern struct tracer nop_trace; 901 902 #ifdef CONFIG_BRANCH_TRACER 903 extern int enable_branch_tracing(struct trace_array *tr); 904 extern void disable_branch_tracing(void); 905 static inline int trace_branch_enable(struct trace_array *tr) 906 { 907 if (trace_flags & TRACE_ITER_BRANCH) 908 return enable_branch_tracing(tr); 909 return 0; 910 } 911 static inline void trace_branch_disable(void) 912 { 913 /* due to races, always disable */ 914 disable_branch_tracing(); 915 } 916 #else 917 static inline int trace_branch_enable(struct trace_array *tr) 918 { 919 return 0; 920 } 921 static inline void trace_branch_disable(void) 922 { 923 } 924 #endif /* CONFIG_BRANCH_TRACER */ 925 926 /* set ring buffers to default size if not already done so */ 927 int tracing_update_buffers(void); 928 929 struct ftrace_event_field { 930 struct list_head link; 931 const char *name; 932 const char *type; 933 int filter_type; 934 int offset; 935 int size; 936 int is_signed; 937 }; 938 939 struct event_filter { 940 int n_preds; /* Number assigned */ 941 int a_preds; /* allocated */ 942 struct filter_pred *preds; 943 struct filter_pred *root; 944 char *filter_string; 945 }; 946 947 struct event_subsystem { 948 struct list_head list; 949 const char *name; 950 struct event_filter *filter; 951 int ref_count; 952 }; 953 954 struct ftrace_subsystem_dir { 955 struct list_head list; 956 struct event_subsystem *subsystem; 957 struct trace_array *tr; 958 struct dentry *entry; 959 int ref_count; 960 int nr_events; 961 }; 962 963 #define FILTER_PRED_INVALID ((unsigned short)-1) 964 #define FILTER_PRED_IS_RIGHT (1 << 15) 965 #define FILTER_PRED_FOLD (1 << 15) 966 967 /* 968 * The max preds is the size of unsigned short with 969 * two flags at the MSBs. One bit is used for both the IS_RIGHT 970 * and FOLD flags. The other is reserved. 971 * 972 * 2^14 preds is way more than enough. 973 */ 974 #define MAX_FILTER_PRED 16384 975 976 struct filter_pred; 977 struct regex; 978 979 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); 980 981 typedef int (*regex_match_func)(char *str, struct regex *r, int len); 982 983 enum regex_type { 984 MATCH_FULL = 0, 985 MATCH_FRONT_ONLY, 986 MATCH_MIDDLE_ONLY, 987 MATCH_END_ONLY, 988 }; 989 990 struct regex { 991 char pattern[MAX_FILTER_STR_VAL]; 992 int len; 993 int field_len; 994 regex_match_func match; 995 }; 996 997 struct filter_pred { 998 filter_pred_fn_t fn; 999 u64 val; 1000 struct regex regex; 1001 unsigned short *ops; 1002 struct ftrace_event_field *field; 1003 int offset; 1004 int not; 1005 int op; 1006 unsigned short index; 1007 unsigned short parent; 1008 unsigned short left; 1009 unsigned short right; 1010 }; 1011 1012 extern enum regex_type 1013 filter_parse_regex(char *buff, int len, char **search, int *not); 1014 extern void print_event_filter(struct ftrace_event_file *file, 1015 struct trace_seq *s); 1016 extern int apply_event_filter(struct ftrace_event_file *file, 1017 char *filter_string); 1018 extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir, 1019 char *filter_string); 1020 extern void print_subsystem_event_filter(struct event_subsystem *system, 1021 struct trace_seq *s); 1022 extern int filter_assign_type(const char *type); 1023 1024 struct ftrace_event_field * 1025 trace_find_event_field(struct ftrace_event_call *call, char *name); 1026 1027 extern void trace_event_enable_cmd_record(bool enable); 1028 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); 1029 extern int event_trace_del_tracer(struct trace_array *tr); 1030 1031 extern struct mutex event_mutex; 1032 extern struct list_head ftrace_events; 1033 1034 extern const char *__start___trace_bprintk_fmt[]; 1035 extern const char *__stop___trace_bprintk_fmt[]; 1036 1037 extern const char *__start___tracepoint_str[]; 1038 extern const char *__stop___tracepoint_str[]; 1039 1040 void trace_printk_init_buffers(void); 1041 void trace_printk_start_comm(void); 1042 int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); 1043 int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); 1044 1045 /* 1046 * Normal trace_printk() and friends allocates special buffers 1047 * to do the manipulation, as well as saves the print formats 1048 * into sections to display. But the trace infrastructure wants 1049 * to use these without the added overhead at the price of being 1050 * a bit slower (used mainly for warnings, where we don't care 1051 * about performance). The internal_trace_puts() is for such 1052 * a purpose. 1053 */ 1054 #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) 1055 1056 #undef FTRACE_ENTRY 1057 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ 1058 extern struct ftrace_event_call \ 1059 __attribute__((__aligned__(4))) event_##call; 1060 #undef FTRACE_ENTRY_DUP 1061 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ 1062 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ 1063 filter) 1064 #include "trace_entries.h" 1065 1066 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) 1067 int perf_ftrace_event_register(struct ftrace_event_call *call, 1068 enum trace_reg type, void *data); 1069 #else 1070 #define perf_ftrace_event_register NULL 1071 #endif 1072 1073 #endif /* _LINUX_KERNEL_TRACE_H */ 1074