| 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) \
|
| 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)
|
| 70 |
|
| 71 | #include "trace_entries.h"
|
| 72 |
|
| 73 | |
| 74 | * syscalls are special, and need special handling, this is why
|
| 75 | * they are not included in trace_entries.h
|
| 76 |
|
| 77 | struct syscall_trace_enter {
|
| 78 | struct trace_entry ent;
|
| 79 | int nr;
|
| 80 | unsigned long args[];
|
| 81 | };
|
| 82 |
|
| 83 | struct syscall_trace_exit {
|
| 84 | struct trace_entry ent;
|
| 85 | int nr;
|
| 86 | long ret;
|
| 87 | };
|
| 88 |
|
| 89 | struct kprobe_trace_entry_head {
|
| 90 | struct trace_entry ent;
|
| 91 | unsigned long ip;
|
| 92 | };
|
| 93 |
|
| 94 | struct kretprobe_trace_entry_head {
|
| 95 | struct trace_entry ent;
|
| 96 | unsigned long func;
|
| 97 | unsigned long ret_ip;
|
| 98 | };
|
| 99 |
|
| 100 | |
| 101 | * trace_flag_type is an enumeration that holds different
|
| 102 | * states when a trace occurs. These are:
|
| 103 | * IRQS_OFF - interrupts were disabled
|
| 104 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
|
| 105 | * NEED_RESCHED - reschedule is requested
|
| 106 | * HARDIRQ - inside an interrupt handler
|
| 107 | * SOFTIRQ - inside a softirq handler
|
| 108 |
|
| 109 | enum trace_flag_type {
|
| 110 | TRACE_FLAG_IRQS_OFF = 0x01,
|
| 111 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
|
| 112 | TRACE_FLAG_NEED_RESCHED = 0x04,
|
| 113 | TRACE_FLAG_HARDIRQ = 0x08,
|
| 114 | TRACE_FLAG_SOFTIRQ = 0x10,
|
| 115 | };
|
| 116 |
|
| 117 | #define TRACE_BUF_SIZE 1024
|
| 118 |
|
| 119 | |
| 120 | * The CPU trace array - it consists of thousands of trace entries
|
| 121 | * plus some other descriptor data: (for example which task started
|
| 122 | * the trace, etc.)
|
| 123 |
|
| 124 | struct trace_array_cpu {
|
| 125 | atomic_t disabled;
|
| 126 | void *buffer_page;
|
| 127 |
|
| 128 | unsigned long saved_latency;
|
| 129 | unsigned long critical_start;
|
| 130 | unsigned long critical_end;
|
| 131 | unsigned long critical_sequence;
|
| 132 | unsigned long nice;
|
| 133 | unsigned long policy;
|
| 134 | unsigned long rt_priority;
|
| 135 | unsigned long skipped_entries;
|
| 136 | cycle_t preempt_timestamp;
|
| 137 | pid_t pid;
|
| 138 | uid_t uid;
|
| 139 | char comm[TASK_COMM_LEN];
|
| 140 | };
|
| 141 |
|
| 142 | |
| 143 | * The trace array - an array of per-CPU trace arrays. This is the
|
| 144 | * highest level data structure that individual tracers deal with.
|
| 145 | * They have on/off state as well:
|
| 146 |
|
| 147 | struct trace_array {
|
| 148 | struct ring_buffer *buffer;
|
| 149 | unsigned long entries;
|
| 150 | int cpu;
|
| 151 | cycle_t time_start;
|
| 152 | struct task_struct *waiter;
|
| 153 | struct trace_array_cpu *data[NR_CPUS];
|
| 154 | };
|
| 155 |
|
| 156 | #define FTRACE_CMP_TYPE(var, type) \
|
| 157 | __builtin_types_compatible_p(typeof(var), type *)
|
| 158 |
|
| 159 | #undef IF_ASSIGN
|
| 160 | #define IF_ASSIGN(var, entry, etype, id) \
|
| 161 | if (FTRACE_CMP_TYPE(var, etype)) { \
|
| 162 | var = (typeof(var))(entry); \
|
| 163 | WARN_ON(id && (entry)->type != id); \
|
| 164 | break; \
|
| 165 | }
|
| 166 |
|
| 167 |
|
| 168 | extern void __ftrace_bad_type(void);
|
| 169 |
|
| 170 | |
| 171 | * The trace_assign_type is a verifier that the entry type is
|
| 172 | * the same as the type being assigned. To add new types simply
|
| 173 | * add a line with the following format:
|
| 174 | *
|
| 175 | * IF_ASSIGN(var, ent, type, id);
|
| 176 | *
|
| 177 | * Where "type" is the trace type that includes the trace_entry
|
| 178 | * as the "ent" item. And "id" is the trace identifier that is
|
| 179 | * used in the trace_type enum.
|
| 180 | *
|
| 181 | * If the type can have more than one id, then use zero.
|
| 182 |
|
| 183 | #define trace_assign_type(var, ent) \
|
| 184 | do { \
|
| 185 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
|
| 186 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
|
| 187 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
|
| 188 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
|
| 189 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
|
| 190 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
|
| 191 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
|
| 192 | TRACE_MMIO_RW); \
|
| 193 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
|
| 194 | TRACE_MMIO_MAP); \
|
| 195 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
|
| 196 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
|
| 197 | TRACE_GRAPH_ENT); \
|
| 198 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
|
| 199 | TRACE_GRAPH_RET); \
|
| 200 | __ftrace_bad_type(); \
|
| 201 | } while (0)
|
| 202 |
|
| 203 | |
| 204 | * An option specific to a tracer. This is a boolean value.
|
| 205 | * The bit is the bit index that sets its value on the
|
| 206 | * flags value in struct tracer_flags.
|
| 207 |
|
| 208 | struct tracer_opt {
|
| 209 | const char *name;
|
| 210 | u32 bit;
|
| 211 | };
|
| 212 |
|
| 213 | |
| 214 | * The set of specific options for a tracer. Your tracer
|
| 215 | * have to set the initial value of the flags val.
|
| 216 |
|
| 217 | struct tracer_flags {
|
| 218 | u32 val;
|
| 219 | struct tracer_opt *opts;
|
| 220 | };
|
| 221 |
|
| 222 |
|
| 223 | #define TRACER_OPT(s, b) .name = #s, .bit = b
|
| 224 |
|
| 225 |
|
| 226 | |
| 227 | * struct tracer - a specific tracer and its callbacks to interact with debugfs
|
| 228 | * @name: the name chosen to select it on the available_tracers file
|
| 229 | * @init: called when one switches to this tracer (echo name > current_tracer)
|
| 230 | * @reset: called when one switches to another tracer
|
| 231 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
|
| 232 | * @stop: called when tracing is paused (echo 0 > tracing_enabled)
|
| 233 | * @open: called when the trace file is opened
|
| 234 | * @pipe_open: called when the trace_pipe file is opened
|
| 235 | * @wait_pipe: override how the user waits for traces on trace_pipe
|
| 236 | * @close: called when the trace file is released
|
| 237 | * @pipe_close: called when the trace_pipe file is released
|
| 238 | * @read: override the default read callback on trace_pipe
|
| 239 | * @splice_read: override the default splice_read callback on trace_pipe
|
| 240 | * @selftest: selftest to run on boot (see trace_selftest.c)
|
| 241 | * @print_headers: override the first lines that describe your columns
|
| 242 | * @print_line: callback that prints a trace
|
| 243 | * @set_flag: signals one of your private flags changed (trace_options file)
|
| 244 | * @flags: your private flags
|
| 245 |
|
| 246 | struct tracer {
|
| 247 | const char *name;
|
| 248 | int (*init)(struct trace_array *tr);
|
| 249 | void (*reset)(struct trace_array *tr);
|
| 250 | void (*start)(struct trace_array *tr);
|
| 251 | void (*stop)(struct trace_array *tr);
|
| 252 | void (*open)(struct trace_iterator *iter);
|
| 253 | void (*pipe_open)(struct trace_iterator *iter);
|
| 254 | void (*wait_pipe)(struct trace_iterator *iter);
|
| 255 | void (*close)(struct trace_iterator *iter);
|
| 256 | void (*pipe_close)(struct trace_iterator *iter);
|
| 257 | ssize_t (*read)(struct trace_iterator *iter,
|
| 258 | struct file *filp, char __user *ubuf,
|
| 259 | size_t cnt, loff_t *ppos);
|
| 260 | ssize_t (*splice_read)(struct trace_iterator *iter,
|
| 261 | struct file *filp,
|
| 262 | loff_t *ppos,
|
| 263 | struct pipe_inode_info *pipe,
|
| 264 | size_t len,
|
| 265 | unsigned int flags);
|
| 266 | #ifdef CONFIG_FTRACE_STARTUP_TEST
|
| 267 | int (*selftest)(struct tracer *trace,
|
| 268 | struct trace_array *tr);
|
| 269 | #endif
|
| 270 | void (*print_header)(struct seq_file *m);
|
| 271 | enum print_line_t (*print_line)(struct trace_iterator *iter);
|
| 272 |
|
| 273 | int (*set_flag)(u32 old_flags, u32 bit, int set);
|
| 274 | struct tracer *next;
|
| 275 | struct tracer_flags *flags;
|
| 276 | int print_max;
|
| 277 | int use_max_tr;
|
| 278 | };
|
| 279 |
|
| 280 |
|
| 281 |
|
| 282 | #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
|
| 283 | #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
|
| 284 |
|
| 285 |
|
| 286 | #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
|
| 287 |
|
| 288 |
|
| 289 | #define TRACE_INTERNAL_BIT (1<<11)
|
| 290 | #define TRACE_GLOBAL_BIT (1<<12)
|
| 291 | |
| 292 | * Abuse of the trace_recursion.
|
| 293 | * As we need a way to maintain state if we are tracing the function
|
| 294 | * graph in irq because we want to trace a particular function that
|
| 295 | * was called in irq context but we have irq tracing off. Since this
|
| 296 | * can only be modified by current, we can reuse trace_recursion.
|
| 297 |
|
| 298 | #define TRACE_IRQ_BIT (1<<13)
|
| 299 |
|
| 300 | #define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0)
|
| 301 | #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0)
|
| 302 | #define trace_recursion_test(bit) ((current)->trace_recursion & (bit))
|
| 303 |
|
| 304 | #define TRACE_PIPE_ALL_CPU -1
|
| 305 |
|
| 306 | int tracer_init(struct tracer *t, struct trace_array *tr);
|
| 307 | int tracing_is_enabled(void);
|
| 308 | void trace_wake_up(void);
|
| 309 | void tracing_reset(struct trace_array *tr, int cpu);
|
| 310 | void tracing_reset_online_cpus(struct trace_array *tr);
|
| 311 | void tracing_reset_current(int cpu);
|
| 312 | void tracing_reset_current_online_cpus(void);
|
| 313 | int tracing_open_generic(struct inode *inode, struct file *filp);
|
| 314 | struct dentry *trace_create_file(const char *name,
|
| 315 | mode_t mode,
|
| 316 | struct dentry *parent,
|
| 317 | void *data,
|
| 318 | const struct file_operations *fops);
|
| 319 |
|
| 320 | struct dentry *tracing_init_dentry(void);
|
| 321 |
|
| 322 | struct ring_buffer_event;
|
| 323 |
|
| 324 | struct ring_buffer_event *
|
| 325 | trace_buffer_lock_reserve(struct ring_buffer *buffer,
|
| 326 | int type,
|
| 327 | unsigned long len,
|
| 328 | unsigned long flags,
|
| 329 | int pc);
|
| 330 | void trace_buffer_unlock_commit(struct ring_buffer *buffer,
|
| 331 | struct ring_buffer_event *event,
|
| 332 | unsigned long flags, int pc);
|
| 333 |
|
| 334 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
|
| 335 | struct trace_array_cpu *data);
|
| 336 |
|
| 337 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
|
| 338 | int *ent_cpu, u64 *ent_ts);
|
| 339 |
|
| 340 | int trace_empty(struct trace_iterator *iter);
|
| 341 |
|
| 342 | void *trace_find_next_entry_inc(struct trace_iterator *iter);
|
| 343 |
|
| 344 | void trace_init_global_iter(struct trace_iterator *iter);
|
| 345 |
|
| 346 | void tracing_iter_reset(struct trace_iterator *iter, int cpu);
|
| 347 |
|
| 348 | void default_wait_pipe(struct trace_iterator *iter);
|
| 349 | void poll_wait_pipe(struct trace_iterator *iter);
|
| 350 |
|
| 351 | void ftrace(struct trace_array *tr,
|
| 352 | struct trace_array_cpu *data,
|
| 353 | unsigned long ip,
|
| 354 | unsigned long parent_ip,
|
| 355 | unsigned long flags, int pc);
|
| 356 | void tracing_sched_switch_trace(struct trace_array *tr,
|
| 357 | struct task_struct *prev,
|
| 358 | struct task_struct *next,
|
| 359 | unsigned long flags, int pc);
|
| 360 |
|
| 361 | void tracing_sched_wakeup_trace(struct trace_array *tr,
|
| 362 | struct task_struct *wakee,
|
| 363 | struct task_struct *cur,
|
| 364 | unsigned long flags, int pc);
|
| 365 | void trace_function(struct trace_array *tr,
|
| 366 | unsigned long ip,
|
| 367 | unsigned long parent_ip,
|
| 368 | unsigned long flags, int pc);
|
| 369 | void trace_graph_function(struct trace_array *tr,
|
| 370 | unsigned long ip,
|
| 371 | unsigned long parent_ip,
|
| 372 | unsigned long flags, int pc);
|
| 373 | void trace_default_header(struct seq_file *m);
|
| 374 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
|
| 375 | int trace_empty(struct trace_iterator *iter);
|
| 376 |
|
| 377 | void trace_graph_return(struct ftrace_graph_ret *trace);
|
| 378 | int trace_graph_entry(struct ftrace_graph_ent *trace);
|
| 379 | void set_graph_array(struct trace_array *tr);
|
| 380 |
|
| 381 | void tracing_start_cmdline_record(void);
|
| 382 | void tracing_stop_cmdline_record(void);
|
| 383 | void tracing_sched_switch_assign_trace(struct trace_array *tr);
|
| 384 | void tracing_stop_sched_switch_record(void);
|
| 385 | void tracing_start_sched_switch_record(void);
|
| 386 | int register_tracer(struct tracer *type);
|
| 387 | void unregister_tracer(struct tracer *type);
|
| 388 | int is_tracing_stopped(void);
|
| 389 | enum trace_file_type {
|
| 390 | TRACE_FILE_LAT_FMT = 1,
|
| 391 | TRACE_FILE_ANNOTATE = 2,
|
| 392 | };
|
| 393 |
|
| 394 | extern cpumask_var_t __read_mostly tracing_buffer_mask;
|
| 395 |
|
| 396 | #define for_each_tracing_cpu(cpu) \
|
| 397 | for_each_cpu(cpu, tracing_buffer_mask)
|
| 398 |
|
| 399 | extern unsigned long nsecs_to_usecs(unsigned long nsecs);
|
| 400 |
|
| 401 | extern unsigned long tracing_thresh;
|
| 402 |
|
| 403 | #ifdef CONFIG_TRACER_MAX_TRACE
|
| 404 | extern unsigned long tracing_max_latency;
|
| 405 |
|
| 406 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
|
| 407 | void update_max_tr_single(struct trace_array *tr,
|
| 408 | struct task_struct *tsk, int cpu);
|
| 409 | #endif
|
| 410 |
|
| 411 | #ifdef CONFIG_STACKTRACE
|
| 412 | void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
|
| 413 | int skip, int pc);
|
| 414 |
|
| 415 | void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
|
| 416 | int skip, int pc, struct pt_regs *regs);
|
| 417 |
|
| 418 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
|
| 419 | int pc);
|
| 420 |
|
| 421 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
|
| 422 | int pc);
|
| 423 | #else
|
| 424 | static inline void ftrace_trace_stack(struct ring_buffer *buffer,
|
| 425 | unsigned long flags, int skip, int pc)
|
| 426 | {
|
| 427 | }
|
| 428 |
|
| 429 | static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
|
| 430 | unsigned long flags, int skip,
|
| 431 | int pc, struct pt_regs *regs)
|
| 432 | {
|
| 433 | }
|
| 434 |
|
| 435 | static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
|
| 436 | unsigned long flags, int pc)
|
| 437 | {
|
| 438 | }
|
| 439 |
|
| 440 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
|
| 441 | int skip, int pc)
|
| 442 | {
|
| 443 | }
|
| 444 | #endif
|
| 445 |
|
| 446 | extern cycle_t ftrace_now(int cpu);
|
| 447 |
|
| 448 | extern void trace_find_cmdline(int pid, char comm[]);
|
| 449 |
|
| 450 | #ifdef CONFIG_DYNAMIC_FTRACE
|
| 451 | extern unsigned long ftrace_update_tot_cnt;
|
| 452 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
|
| 453 | extern int DYN_FTRACE_TEST_NAME(void);
|
| 454 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
|
| 455 | extern int DYN_FTRACE_TEST_NAME2(void);
|
| 456 | #endif
|
| 457 |
|
| 458 | extern int ring_buffer_expanded;
|
| 459 | extern bool tracing_selftest_disabled;
|
| 460 | DECLARE_PER_CPU(int, ftrace_cpu_disabled);
|
| 461 |
|
| 462 | #ifdef CONFIG_FTRACE_STARTUP_TEST
|
| 463 | extern int trace_selftest_startup_function(struct tracer *trace,
|
| 464 | struct trace_array *tr);
|
| 465 | extern int trace_selftest_startup_function_graph(struct tracer *trace,
|
| 466 | struct trace_array *tr);
|
| 467 | extern int trace_selftest_startup_irqsoff(struct tracer *trace,
|
| 468 | struct trace_array *tr);
|
| 469 | extern int trace_selftest_startup_preemptoff(struct tracer *trace,
|
| 470 | struct trace_array *tr);
|
| 471 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
|
| 472 | struct trace_array *tr);
|
| 473 | extern int trace_selftest_startup_wakeup(struct tracer *trace,
|
| 474 | struct trace_array *tr);
|
| 475 | extern int trace_selftest_startup_nop(struct tracer *trace,
|
| 476 | struct trace_array *tr);
|
| 477 | extern int trace_selftest_startup_sched_switch(struct tracer *trace,
|
| 478 | struct trace_array *tr);
|
| 479 | extern int trace_selftest_startup_branch(struct tracer *trace,
|
| 480 | struct trace_array *tr);
|
| 481 | #endif
|
| 482 |
|
| 483 | extern void *head_page(struct trace_array_cpu *data);
|
| 484 | extern unsigned long long ns2usecs(cycle_t nsec);
|
| 485 | extern int
|
| 486 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
|
| 487 | extern int
|
| 488 | trace_vprintk(unsigned long ip, const char *fmt, va_list args);
|
| 489 | extern int
|
| 490 | trace_array_vprintk(struct trace_array *tr,
|
| 491 | unsigned long ip, const char *fmt, va_list args);
|
| 492 | int trace_array_printk(struct trace_array *tr,
|
| 493 | unsigned long ip, const char *fmt, ...);
|
| 494 | void trace_printk_seq(struct trace_seq *s);
|
| 495 | enum print_line_t print_trace_line(struct trace_iterator *iter);
|
| 496 |
|
| 497 | extern unsigned long trace_flags;
|
| 498 |
|
| 499 | extern int trace_clock_id;
|
| 500 |
|
| 501 |
|
| 502 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
| 503 |
|
| 504 |
|
| 505 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1
|
| 506 | #define TRACE_GRAPH_PRINT_CPU 0x2
|
| 507 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
|
| 508 | #define TRACE_GRAPH_PRINT_PROC 0x8
|
| 509 | #define TRACE_GRAPH_PRINT_DURATION 0x10
|
| 510 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
|
| 511 |
|
| 512 | extern enum print_line_t
|
| 513 | print_graph_function_flags(struct trace_iterator *iter, u32 flags);
|
| 514 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
|
| 515 | extern enum print_line_t
|
| 516 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
|
| 517 | extern void graph_trace_open(struct trace_iterator *iter);
|
| 518 | extern void graph_trace_close(struct trace_iterator *iter);
|
| 519 | extern int __trace_graph_entry(struct trace_array *tr,
|
| 520 | struct ftrace_graph_ent *trace,
|
| 521 | unsigned long flags, int pc);
|
| 522 | extern void __trace_graph_return(struct trace_array *tr,
|
| 523 | struct ftrace_graph_ret *trace,
|
| 524 | unsigned long flags, int pc);
|
| 525 |
|
| 526 |
|
| 527 | #ifdef CONFIG_DYNAMIC_FTRACE
|
| 528 |
|
| 529 | #define FTRACE_GRAPH_MAX_FUNCS 32
|
| 530 | extern int ftrace_graph_filter_enabled;
|
| 531 | extern int ftrace_graph_count;
|
| 532 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
|
| 533 |
|
| 534 | static inline int ftrace_graph_addr(unsigned long addr)
|
| 535 | {
|
| 536 | int i;
|
| 537 |
|
| 538 | if (!ftrace_graph_filter_enabled)
|
| 539 | return 1;
|
| 540 |
|
| 541 | for (i = 0; i < ftrace_graph_count; i++) {
|
| 542 | if (addr == ftrace_graph_funcs[i]) {
|
| 543 | |
| 544 | * If no irqs are to be traced, but a set_graph_function
|
| 545 | * is set, and called by an interrupt handler, we still
|
| 546 | * want to trace it.
|
| 547 |
|
| 548 | if (in_irq())
|
| 549 | trace_recursion_set(TRACE_IRQ_BIT);
|
| 550 | else
|
| 551 | trace_recursion_clear(TRACE_IRQ_BIT);
|
| 552 | return 1;
|
| 553 | }
|
| 554 | }
|
| 555 |
|
| 556 | return 0;
|
| 557 | }
|
| 558 | #else
|
| 559 | static inline int ftrace_graph_addr(unsigned long addr)
|
| 560 | {
|
| 561 | return 1;
|
| 562 | }
|
| 563 | #endif
|
| 564 | #else
|
| 565 | static inline enum print_line_t
|
| 566 | print_graph_function_flags(struct trace_iterator *iter, u32 flags)
|
| 567 | {
|
| 568 | return TRACE_TYPE_UNHANDLED;
|
| 569 | }
|
| 570 | #endif
|
| 571 |
|
| 572 | extern struct list_head ftrace_pids;
|
| 573 |
|
| 574 | #ifdef CONFIG_FUNCTION_TRACER
|
| 575 | static inline int ftrace_trace_task(struct task_struct *task)
|
| 576 | {
|
| 577 | if (list_empty(&ftrace_pids))
|
| 578 | return 1;
|
| 579 |
|
| 580 | return test_tsk_trace_trace(task);
|
| 581 | }
|
| 582 | extern int ftrace_is_dead(void);
|
| 583 | #else
|
| 584 | static inline int ftrace_trace_task(struct task_struct *task)
|
| 585 | {
|
| 586 | return 1;
|
| 587 | }
|
| 588 | static inline int ftrace_is_dead(void) { return 0; }
|
| 589 | #endif
|
| 590 |
|
| 591 | |
| 592 | * struct trace_parser - servers for reading the user input separated by spaces
|
| 593 | * @cont: set if the input is not complete - no final space char was found
|
| 594 | * @buffer: holds the parsed user input
|
| 595 | * @idx: user input length
|
| 596 | * @size: buffer size
|
| 597 |
|
| 598 | struct trace_parser {
|
| 599 | bool cont;
|
| 600 | char *buffer;
|
| 601 | unsigned idx;
|
| 602 | unsigned size;
|
| 603 | };
|
| 604 |
|
| 605 | static inline bool trace_parser_loaded(struct trace_parser *parser)
|
| 606 | {
|
| 607 | return (parser->idx != 0);
|
| 608 | }
|
| 609 |
|
| 610 | static inline bool trace_parser_cont(struct trace_parser *parser)
|
| 611 | {
|
| 612 | return parser->cont;
|
| 613 | }
|
| 614 |
|
| 615 | static inline void trace_parser_clear(struct trace_parser *parser)
|
| 616 | {
|
| 617 | parser->cont = false;
|
| 618 | parser->idx = 0;
|
| 619 | }
|
| 620 |
|
| 621 | extern int trace_parser_get_init(struct trace_parser *parser, int size);
|
| 622 | extern void trace_parser_put(struct trace_parser *parser);
|
| 623 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
|
| 624 | size_t cnt, loff_t *ppos);
|
| 625 |
|
| 626 | |
| 627 | * trace_iterator_flags is an enumeration that defines bit
|
| 628 | * positions into trace_flags that controls the output.
|
| 629 | *
|
| 630 | * NOTE: These bits must match the trace_options array in
|
| 631 | * trace.c.
|
| 632 |
|
| 633 | enum trace_iterator_flags {
|
| 634 | TRACE_ITER_PRINT_PARENT = 0x01,
|
| 635 | TRACE_ITER_SYM_OFFSET = 0x02,
|
| 636 | TRACE_ITER_SYM_ADDR = 0x04,
|
| 637 | TRACE_ITER_VERBOSE = 0x08,
|
| 638 | TRACE_ITER_RAW = 0x10,
|
| 639 | TRACE_ITER_HEX = 0x20,
|
| 640 | TRACE_ITER_BIN = 0x40,
|
| 641 | TRACE_ITER_BLOCK = 0x80,
|
| 642 | TRACE_ITER_STACKTRACE = 0x100,
|
| 643 | TRACE_ITER_PRINTK = 0x200,
|
| 644 | TRACE_ITER_PREEMPTONLY = 0x400,
|
| 645 | TRACE_ITER_BRANCH = 0x800,
|
| 646 | TRACE_ITER_ANNOTATE = 0x1000,
|
| 647 | TRACE_ITER_USERSTACKTRACE = 0x2000,
|
| 648 | TRACE_ITER_SYM_USEROBJ = 0x4000,
|
| 649 | TRACE_ITER_PRINTK_MSGONLY = 0x8000,
|
| 650 | TRACE_ITER_CONTEXT_INFO = 0x10000,
|
| 651 | TRACE_ITER_LATENCY_FMT = 0x20000,
|
| 652 | TRACE_ITER_SLEEP_TIME = 0x40000,
|
| 653 | TRACE_ITER_GRAPH_TIME = 0x80000,
|
| 654 | TRACE_ITER_RECORD_CMD = 0x100000,
|
| 655 | TRACE_ITER_OVERWRITE = 0x200000,
|
| 656 | TRACE_ITER_STOP_ON_FREE = 0x400000,
|
| 657 | };
|
| 658 |
|
| 659 | |
| 660 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that
|
| 661 | * control the output of kernel symbols.
|
| 662 |
|
| 663 | #define TRACE_ITER_SYM_MASK \
|
| 664 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
|
| 665 |
|
| 666 | extern struct tracer nop_trace;
|
| 667 |
|
| 668 | #ifdef CONFIG_BRANCH_TRACER
|
| 669 | extern int enable_branch_tracing(struct trace_array *tr);
|
| 670 | extern void disable_branch_tracing(void);
|
| 671 | static inline int trace_branch_enable(struct trace_array *tr)
|
| 672 | {
|
| 673 | if (trace_flags & TRACE_ITER_BRANCH)
|
| 674 | return enable_branch_tracing(tr);
|
| 675 | return 0;
|
| 676 | }
|
| 677 | static inline void trace_branch_disable(void)
|
| 678 | {
|
| 679 |
|
| 680 | disable_branch_tracing();
|
| 681 | }
|
| 682 | #else
|
| 683 | static inline int trace_branch_enable(struct trace_array *tr)
|
| 684 | {
|
| 685 | return 0;
|
| 686 | }
|
| 687 | static inline void trace_branch_disable(void)
|
| 688 | {
|
| 689 | }
|
| 690 | #endif
|
| 691 |
|
| 692 |
|
| 693 | int tracing_update_buffers(void);
|
| 694 |
|
| 695 |
|
| 696 | enum {
|
| 697 | TRACE_EVENT_TYPE_PRINTF = 1,
|
| 698 | TRACE_EVENT_TYPE_RAW = 2,
|
| 699 | };
|
| 700 |
|
| 701 | struct ftrace_event_field {
|
| 702 | struct list_head link;
|
| 703 | char *name;
|
| 704 | char *type;
|
| 705 | int filter_type;
|
| 706 | int offset;
|
| 707 | int size;
|
| 708 | int is_signed;
|
| 709 | };
|
| 710 |
|
| 711 | struct event_filter {
|
| 712 | int n_preds;
|
| 713 | int a_preds;
|
| 714 | struct filter_pred *preds;
|
| 715 | struct filter_pred *root;
|
| 716 | char *filter_string;
|
| 717 | };
|
| 718 |
|
| 719 | struct event_subsystem {
|
| 720 | struct list_head list;
|
| 721 | const char *name;
|
| 722 | struct dentry *entry;
|
| 723 | struct event_filter *filter;
|
| 724 | int nr_events;
|
| 725 | int ref_count;
|
| 726 | };
|
| 727 |
|
| 728 | #define FILTER_PRED_INVALID ((unsigned short)-1)
|
| 729 | #define FILTER_PRED_IS_RIGHT (1 << 15)
|
| 730 | #define FILTER_PRED_FOLD (1 << 15)
|
| 731 |
|
| 732 | |
| 733 | * The max preds is the size of unsigned short with
|
| 734 | * two flags at the MSBs. One bit is used for both the IS_RIGHT
|
| 735 | * and FOLD flags. The other is reserved.
|
| 736 | *
|
| 737 | * 2^14 preds is way more than enough.
|
| 738 |
|
| 739 | #define MAX_FILTER_PRED 16384
|
| 740 |
|
| 741 | struct filter_pred;
|
| 742 | struct regex;
|
| 743 |
|
| 744 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
|
| 745 |
|
| 746 | typedef int (*regex_match_func)(char *str, struct regex *r, int len);
|
| 747 |
|
| 748 | enum regex_type {
|
| 749 | MATCH_FULL = 0,
|
| 750 | MATCH_FRONT_ONLY,
|
| 751 | MATCH_MIDDLE_ONLY,
|
| 752 | MATCH_END_ONLY,
|
| 753 | };
|
| 754 |
|
| 755 | struct regex {
|
| 756 | char pattern[MAX_FILTER_STR_VAL];
|
| 757 | int len;
|
| 758 | int field_len;
|
| 759 | regex_match_func match;
|
| 760 | };
|
| 761 |
|
| 762 | struct filter_pred {
|
| 763 | filter_pred_fn_t fn;
|
| 764 | u64 val;
|
| 765 | struct regex regex;
|
| 766 | unsigned short *ops;
|
| 767 | #ifdef CONFIG_FTRACE_STARTUP_TEST
|
| 768 | struct ftrace_event_field *field;
|
| 769 | #endif
|
| 770 | int offset;
|
| 771 | int not;
|
| 772 | int op;
|
| 773 | unsigned short index;
|
| 774 | unsigned short parent;
|
| 775 | unsigned short left;
|
| 776 | unsigned short right;
|
| 777 | };
|
| 778 |
|
| 779 | extern struct list_head ftrace_common_fields;
|
| 780 |
|
| 781 | extern enum regex_type
|
| 782 | filter_parse_regex(char *buff, int len, char **search, int *not);
|
| 783 | extern void print_event_filter(struct ftrace_event_call *call,
|
| 784 | struct trace_seq *s);
|
| 785 | extern int apply_event_filter(struct ftrace_event_call *call,
|
| 786 | char *filter_string);
|
| 787 | extern int apply_subsystem_event_filter(struct event_subsystem *system,
|
| 788 | char *filter_string);
|
| 789 | extern void print_subsystem_event_filter(struct event_subsystem *system,
|
| 790 | struct trace_seq *s);
|
| 791 | extern int filter_assign_type(const char *type);
|
| 792 |
|
| 793 | struct list_head *
|
| 794 | trace_get_fields(struct ftrace_event_call *event_call);
|
| 795 |
|
| 796 | static inline int
|
| 797 | filter_check_discard(struct ftrace_event_call *call, void *rec,
|
| 798 | struct ring_buffer *buffer,
|
| 799 | struct ring_buffer_event *event)
|
| 800 | {
|
| 801 | if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
|
| 802 | !filter_match_preds(call->filter, rec)) {
|
| 803 | ring_buffer_discard_commit(buffer, event);
|
| 804 | return 1;
|
| 805 | }
|
| 806 |
|
| 807 | return 0;
|
| 808 | }
|
| 809 |
|
| 810 | extern void trace_event_enable_cmd_record(bool enable);
|
| 811 |
|
| 812 | extern struct mutex event_mutex;
|
| 813 | extern struct list_head ftrace_events;
|
| 814 |
|
| 815 | extern const char *__start___trace_bprintk_fmt[];
|
| 816 | extern const char *__stop___trace_bprintk_fmt[];
|
| 817 |
|
| 818 | #undef FTRACE_ENTRY
|
| 819 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
|
| 820 | extern struct ftrace_event_call \
|
| 821 | __attribute__((__aligned__(4))) event_##call;
|
| 822 | #undef FTRACE_ENTRY_DUP
|
| 823 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
|
| 824 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
|
| 825 | #include "trace_entries.h"
|
| 826 |
|
| 827 | #endif
|