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Commit | Line | Data |
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bc0c38d1 SR |
1 | #ifndef _LINUX_KERNEL_TRACE_H |
2 | #define _LINUX_KERNEL_TRACE_H | |
3 | ||
4 | #include <linux/fs.h> | |
5 | #include <asm/atomic.h> | |
6 | #include <linux/sched.h> | |
7 | #include <linux/clocksource.h> | |
3928a8a2 | 8 | #include <linux/ring_buffer.h> |
bd8ac686 | 9 | #include <linux/mmiotrace.h> |
d13744cd | 10 | #include <linux/ftrace.h> |
3f5ec136 | 11 | #include <trace/boot.h> |
bc0c38d1 | 12 | |
72829bc3 TG |
13 | enum trace_type { |
14 | __TRACE_FIRST_TYPE = 0, | |
15 | ||
16 | TRACE_FN, | |
17 | TRACE_CTX, | |
18 | TRACE_WAKE, | |
dd0e545f | 19 | TRACE_CONT, |
72829bc3 | 20 | TRACE_STACK, |
dd0e545f | 21 | TRACE_PRINT, |
72829bc3 | 22 | TRACE_SPECIAL, |
bd8ac686 PP |
23 | TRACE_MMIO_RW, |
24 | TRACE_MMIO_MAP, | |
9f029e83 | 25 | TRACE_BRANCH, |
74239072 FW |
26 | TRACE_BOOT_CALL, |
27 | TRACE_BOOT_RET, | |
15e6cb36 | 28 | TRACE_FN_RET, |
02b67518 | 29 | TRACE_USER_STACK, |
72829bc3 TG |
30 | |
31 | __TRACE_LAST_TYPE | |
32 | }; | |
33 | ||
777e208d SR |
34 | /* |
35 | * The trace entry - the most basic unit of tracing. This is what | |
36 | * is printed in the end as a single line in the trace output, such as: | |
37 | * | |
38 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
39 | */ | |
40 | struct trace_entry { | |
41 | unsigned char type; | |
42 | unsigned char cpu; | |
43 | unsigned char flags; | |
44 | unsigned char preempt_count; | |
45 | int pid; | |
02b67518 | 46 | int tgid; |
777e208d SR |
47 | }; |
48 | ||
bc0c38d1 SR |
49 | /* |
50 | * Function trace entry - function address and parent function addres: | |
51 | */ | |
52 | struct ftrace_entry { | |
777e208d | 53 | struct trace_entry ent; |
bc0c38d1 SR |
54 | unsigned long ip; |
55 | unsigned long parent_ip; | |
56 | }; | |
15e6cb36 FW |
57 | |
58 | /* Function return entry */ | |
59 | struct ftrace_ret_entry { | |
60 | struct trace_entry ent; | |
61 | unsigned long ip; | |
62 | unsigned long parent_ip; | |
63 | unsigned long long calltime; | |
64 | unsigned long long rettime; | |
0231022c | 65 | unsigned long overrun; |
15e6cb36 | 66 | }; |
d13744cd | 67 | extern struct tracer boot_tracer; |
bc0c38d1 SR |
68 | |
69 | /* | |
70 | * Context switch trace entry - which task (and prio) we switched from/to: | |
71 | */ | |
72 | struct ctx_switch_entry { | |
777e208d | 73 | struct trace_entry ent; |
bc0c38d1 SR |
74 | unsigned int prev_pid; |
75 | unsigned char prev_prio; | |
76 | unsigned char prev_state; | |
77 | unsigned int next_pid; | |
78 | unsigned char next_prio; | |
bac524d3 | 79 | unsigned char next_state; |
80b5e940 | 80 | unsigned int next_cpu; |
bc0c38d1 SR |
81 | }; |
82 | ||
f0a920d5 IM |
83 | /* |
84 | * Special (free-form) trace entry: | |
85 | */ | |
86 | struct special_entry { | |
777e208d | 87 | struct trace_entry ent; |
f0a920d5 IM |
88 | unsigned long arg1; |
89 | unsigned long arg2; | |
90 | unsigned long arg3; | |
91 | }; | |
92 | ||
86387f7e IM |
93 | /* |
94 | * Stack-trace entry: | |
95 | */ | |
96 | ||
74f4e369 | 97 | #define FTRACE_STACK_ENTRIES 8 |
86387f7e IM |
98 | |
99 | struct stack_entry { | |
777e208d | 100 | struct trace_entry ent; |
86387f7e IM |
101 | unsigned long caller[FTRACE_STACK_ENTRIES]; |
102 | }; | |
103 | ||
02b67518 TE |
104 | struct userstack_entry { |
105 | struct trace_entry ent; | |
106 | unsigned long caller[FTRACE_STACK_ENTRIES]; | |
107 | }; | |
108 | ||
dd0e545f SR |
109 | /* |
110 | * ftrace_printk entry: | |
111 | */ | |
112 | struct print_entry { | |
777e208d | 113 | struct trace_entry ent; |
dd0e545f SR |
114 | unsigned long ip; |
115 | char buf[]; | |
116 | }; | |
117 | ||
777e208d SR |
118 | #define TRACE_OLD_SIZE 88 |
119 | ||
120 | struct trace_field_cont { | |
121 | unsigned char type; | |
122 | /* Temporary till we get rid of this completely */ | |
123 | char buf[TRACE_OLD_SIZE - 1]; | |
124 | }; | |
125 | ||
126 | struct trace_mmiotrace_rw { | |
127 | struct trace_entry ent; | |
128 | struct mmiotrace_rw rw; | |
129 | }; | |
130 | ||
131 | struct trace_mmiotrace_map { | |
132 | struct trace_entry ent; | |
133 | struct mmiotrace_map map; | |
134 | }; | |
135 | ||
74239072 | 136 | struct trace_boot_call { |
777e208d | 137 | struct trace_entry ent; |
74239072 FW |
138 | struct boot_trace_call boot_call; |
139 | }; | |
140 | ||
141 | struct trace_boot_ret { | |
142 | struct trace_entry ent; | |
143 | struct boot_trace_ret boot_ret; | |
777e208d SR |
144 | }; |
145 | ||
52f232cb SR |
146 | #define TRACE_FUNC_SIZE 30 |
147 | #define TRACE_FILE_SIZE 20 | |
9f029e83 | 148 | struct trace_branch { |
52f232cb SR |
149 | struct trace_entry ent; |
150 | unsigned line; | |
151 | char func[TRACE_FUNC_SIZE+1]; | |
152 | char file[TRACE_FILE_SIZE+1]; | |
153 | char correct; | |
154 | }; | |
155 | ||
fc5e27ae PP |
156 | /* |
157 | * trace_flag_type is an enumeration that holds different | |
158 | * states when a trace occurs. These are: | |
9244489a SR |
159 | * IRQS_OFF - interrupts were disabled |
160 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags | |
161 | * NEED_RESCED - reschedule is requested | |
162 | * HARDIRQ - inside an interrupt handler | |
163 | * SOFTIRQ - inside a softirq handler | |
164 | * CONT - multiple entries hold the trace item | |
fc5e27ae PP |
165 | */ |
166 | enum trace_flag_type { | |
167 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
168 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
169 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
170 | TRACE_FLAG_HARDIRQ = 0x08, | |
171 | TRACE_FLAG_SOFTIRQ = 0x10, | |
172 | TRACE_FLAG_CONT = 0x20, | |
fc5e27ae PP |
173 | }; |
174 | ||
5bf9a1ee | 175 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 SR |
176 | |
177 | /* | |
178 | * The CPU trace array - it consists of thousands of trace entries | |
179 | * plus some other descriptor data: (for example which task started | |
180 | * the trace, etc.) | |
181 | */ | |
182 | struct trace_array_cpu { | |
bc0c38d1 | 183 | atomic_t disabled; |
4e3c3333 | 184 | |
c7aafc54 | 185 | /* these fields get copied into max-trace: */ |
c7aafc54 | 186 | unsigned long trace_idx; |
53d0aa77 | 187 | unsigned long overrun; |
bc0c38d1 SR |
188 | unsigned long saved_latency; |
189 | unsigned long critical_start; | |
190 | unsigned long critical_end; | |
191 | unsigned long critical_sequence; | |
192 | unsigned long nice; | |
193 | unsigned long policy; | |
194 | unsigned long rt_priority; | |
195 | cycle_t preempt_timestamp; | |
196 | pid_t pid; | |
197 | uid_t uid; | |
198 | char comm[TASK_COMM_LEN]; | |
199 | }; | |
200 | ||
201 | struct trace_iterator; | |
202 | ||
203 | /* | |
204 | * The trace array - an array of per-CPU trace arrays. This is the | |
205 | * highest level data structure that individual tracers deal with. | |
206 | * They have on/off state as well: | |
207 | */ | |
208 | struct trace_array { | |
3928a8a2 | 209 | struct ring_buffer *buffer; |
bc0c38d1 | 210 | unsigned long entries; |
bc0c38d1 SR |
211 | int cpu; |
212 | cycle_t time_start; | |
b3806b43 | 213 | struct task_struct *waiter; |
bc0c38d1 SR |
214 | struct trace_array_cpu *data[NR_CPUS]; |
215 | }; | |
216 | ||
7104f300 SR |
217 | #define FTRACE_CMP_TYPE(var, type) \ |
218 | __builtin_types_compatible_p(typeof(var), type *) | |
219 | ||
220 | #undef IF_ASSIGN | |
221 | #define IF_ASSIGN(var, entry, etype, id) \ | |
222 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
223 | var = (typeof(var))(entry); \ | |
224 | WARN_ON(id && (entry)->type != id); \ | |
225 | break; \ | |
226 | } | |
227 | ||
228 | /* Will cause compile errors if type is not found. */ | |
229 | extern void __ftrace_bad_type(void); | |
230 | ||
231 | /* | |
232 | * The trace_assign_type is a verifier that the entry type is | |
233 | * the same as the type being assigned. To add new types simply | |
234 | * add a line with the following format: | |
235 | * | |
236 | * IF_ASSIGN(var, ent, type, id); | |
237 | * | |
238 | * Where "type" is the trace type that includes the trace_entry | |
239 | * as the "ent" item. And "id" is the trace identifier that is | |
240 | * used in the trace_type enum. | |
241 | * | |
242 | * If the type can have more than one id, then use zero. | |
243 | */ | |
244 | #define trace_assign_type(var, ent) \ | |
245 | do { \ | |
246 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
247 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
248 | IF_ASSIGN(var, ent, struct trace_field_cont, TRACE_CONT); \ | |
249 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ | |
02b67518 | 250 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 SR |
251 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
252 | IF_ASSIGN(var, ent, struct special_entry, 0); \ | |
253 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ | |
254 | TRACE_MMIO_RW); \ | |
255 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
256 | TRACE_MMIO_MAP); \ | |
74239072 FW |
257 | IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\ |
258 | IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\ | |
9f029e83 | 259 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
74239072 | 260 | IF_ASSIGN(var, ent, struct ftrace_ret_entry, TRACE_FN_RET);\ |
7104f300 SR |
261 | __ftrace_bad_type(); \ |
262 | } while (0) | |
2c4f035f FW |
263 | |
264 | /* Return values for print_line callback */ | |
265 | enum print_line_t { | |
266 | TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ | |
267 | TRACE_TYPE_HANDLED = 1, | |
268 | TRACE_TYPE_UNHANDLED = 2 /* Relay to other output functions */ | |
269 | }; | |
270 | ||
adf9f195 FW |
271 | |
272 | /* | |
273 | * An option specific to a tracer. This is a boolean value. | |
274 | * The bit is the bit index that sets its value on the | |
275 | * flags value in struct tracer_flags. | |
276 | */ | |
277 | struct tracer_opt { | |
278 | const char *name; /* Will appear on the trace_options file */ | |
279 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
280 | }; | |
281 | ||
282 | /* | |
283 | * The set of specific options for a tracer. Your tracer | |
284 | * have to set the initial value of the flags val. | |
285 | */ | |
286 | struct tracer_flags { | |
287 | u32 val; | |
288 | struct tracer_opt *opts; | |
289 | }; | |
290 | ||
291 | /* Makes more easy to define a tracer opt */ | |
292 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
293 | ||
bc0c38d1 SR |
294 | /* |
295 | * A specific tracer, represented by methods that operate on a trace array: | |
296 | */ | |
297 | struct tracer { | |
298 | const char *name; | |
1c80025a FW |
299 | /* Your tracer should raise a warning if init fails */ |
300 | int (*init)(struct trace_array *tr); | |
bc0c38d1 | 301 | void (*reset)(struct trace_array *tr); |
9036990d SR |
302 | void (*start)(struct trace_array *tr); |
303 | void (*stop)(struct trace_array *tr); | |
bc0c38d1 | 304 | void (*open)(struct trace_iterator *iter); |
107bad8b | 305 | void (*pipe_open)(struct trace_iterator *iter); |
bc0c38d1 | 306 | void (*close)(struct trace_iterator *iter); |
107bad8b SR |
307 | ssize_t (*read)(struct trace_iterator *iter, |
308 | struct file *filp, char __user *ubuf, | |
309 | size_t cnt, loff_t *ppos); | |
60a11774 SR |
310 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
311 | int (*selftest)(struct tracer *trace, | |
312 | struct trace_array *tr); | |
313 | #endif | |
8bba1bf5 | 314 | void (*print_header)(struct seq_file *m); |
2c4f035f | 315 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 FW |
316 | /* If you handled the flag setting, return 0 */ |
317 | int (*set_flag)(u32 old_flags, u32 bit, int set); | |
bc0c38d1 SR |
318 | struct tracer *next; |
319 | int print_max; | |
adf9f195 | 320 | struct tracer_flags *flags; |
bc0c38d1 SR |
321 | }; |
322 | ||
214023c3 SR |
323 | struct trace_seq { |
324 | unsigned char buffer[PAGE_SIZE]; | |
325 | unsigned int len; | |
6c6c2796 | 326 | unsigned int readpos; |
214023c3 SR |
327 | }; |
328 | ||
bc0c38d1 SR |
329 | /* |
330 | * Trace iterator - used by printout routines who present trace | |
331 | * results to users and which routines might sleep, etc: | |
332 | */ | |
333 | struct trace_iterator { | |
334 | struct trace_array *tr; | |
335 | struct tracer *trace; | |
107bad8b | 336 | void *private; |
3928a8a2 | 337 | struct ring_buffer_iter *buffer_iter[NR_CPUS]; |
4e3c3333 | 338 | |
53d0aa77 SR |
339 | /* The below is zeroed out in pipe_read */ |
340 | struct trace_seq seq; | |
bc0c38d1 | 341 | struct trace_entry *ent; |
4e3c3333 | 342 | int cpu; |
3928a8a2 | 343 | u64 ts; |
4e3c3333 | 344 | |
bc0c38d1 SR |
345 | unsigned long iter_flags; |
346 | loff_t pos; | |
4c11d7ae | 347 | long idx; |
a309720c SR |
348 | |
349 | cpumask_t started; | |
bc0c38d1 SR |
350 | }; |
351 | ||
9036990d | 352 | int tracing_is_enabled(void); |
45dcd8b8 | 353 | void trace_wake_up(void); |
3928a8a2 | 354 | void tracing_reset(struct trace_array *tr, int cpu); |
bc0c38d1 SR |
355 | int tracing_open_generic(struct inode *inode, struct file *filp); |
356 | struct dentry *tracing_init_dentry(void); | |
d618b3e6 IM |
357 | void init_tracer_sysprof_debugfs(struct dentry *d_tracer); |
358 | ||
45dcd8b8 PP |
359 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
360 | struct trace_array_cpu *data); | |
361 | void tracing_generic_entry_update(struct trace_entry *entry, | |
38697053 SR |
362 | unsigned long flags, |
363 | int pc); | |
45dcd8b8 | 364 | |
bc0c38d1 SR |
365 | void ftrace(struct trace_array *tr, |
366 | struct trace_array_cpu *data, | |
367 | unsigned long ip, | |
368 | unsigned long parent_ip, | |
38697053 | 369 | unsigned long flags, int pc); |
bc0c38d1 SR |
370 | void tracing_sched_switch_trace(struct trace_array *tr, |
371 | struct trace_array_cpu *data, | |
372 | struct task_struct *prev, | |
373 | struct task_struct *next, | |
38697053 | 374 | unsigned long flags, int pc); |
bc0c38d1 | 375 | void tracing_record_cmdline(struct task_struct *tsk); |
57422797 IM |
376 | |
377 | void tracing_sched_wakeup_trace(struct trace_array *tr, | |
378 | struct trace_array_cpu *data, | |
379 | struct task_struct *wakee, | |
380 | struct task_struct *cur, | |
38697053 | 381 | unsigned long flags, int pc); |
f0a920d5 IM |
382 | void trace_special(struct trace_array *tr, |
383 | struct trace_array_cpu *data, | |
384 | unsigned long arg1, | |
385 | unsigned long arg2, | |
38697053 | 386 | unsigned long arg3, int pc); |
6fb44b71 SR |
387 | void trace_function(struct trace_array *tr, |
388 | struct trace_array_cpu *data, | |
389 | unsigned long ip, | |
390 | unsigned long parent_ip, | |
38697053 | 391 | unsigned long flags, int pc); |
15e6cb36 FW |
392 | void |
393 | trace_function_return(struct ftrace_retfunc *trace); | |
bc0c38d1 | 394 | |
41bc8144 SR |
395 | void tracing_start_cmdline_record(void); |
396 | void tracing_stop_cmdline_record(void); | |
e168e051 SR |
397 | void tracing_sched_switch_assign_trace(struct trace_array *tr); |
398 | void tracing_stop_sched_switch_record(void); | |
399 | void tracing_start_sched_switch_record(void); | |
bc0c38d1 SR |
400 | int register_tracer(struct tracer *type); |
401 | void unregister_tracer(struct tracer *type); | |
402 | ||
403 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
404 | ||
405 | extern unsigned long tracing_max_latency; | |
406 | extern unsigned long tracing_thresh; | |
407 | ||
408 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); | |
409 | void update_max_tr_single(struct trace_array *tr, | |
410 | struct task_struct *tsk, int cpu); | |
411 | ||
e309b41d | 412 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 413 | |
606576ce | 414 | #ifdef CONFIG_FUNCTION_TRACER |
001b6767 SR |
415 | void tracing_start_function_trace(void); |
416 | void tracing_stop_function_trace(void); | |
417 | #else | |
418 | # define tracing_start_function_trace() do { } while (0) | |
419 | # define tracing_stop_function_trace() do { } while (0) | |
420 | #endif | |
421 | ||
bc0c38d1 SR |
422 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER |
423 | typedef void | |
424 | (*tracer_switch_func_t)(void *private, | |
5b82a1b0 | 425 | void *__rq, |
bc0c38d1 SR |
426 | struct task_struct *prev, |
427 | struct task_struct *next); | |
428 | ||
429 | struct tracer_switch_ops { | |
430 | tracer_switch_func_t func; | |
431 | void *private; | |
432 | struct tracer_switch_ops *next; | |
433 | }; | |
434 | ||
bc0c38d1 SR |
435 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ |
436 | ||
437 | #ifdef CONFIG_DYNAMIC_FTRACE | |
438 | extern unsigned long ftrace_update_tot_cnt; | |
d05cdb25 SR |
439 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
440 | extern int DYN_FTRACE_TEST_NAME(void); | |
bc0c38d1 SR |
441 | #endif |
442 | ||
60a11774 | 443 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
444 | extern int trace_selftest_startup_function(struct tracer *trace, |
445 | struct trace_array *tr); | |
60a11774 SR |
446 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
447 | struct trace_array *tr); | |
60a11774 SR |
448 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
449 | struct trace_array *tr); | |
60a11774 SR |
450 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
451 | struct trace_array *tr); | |
60a11774 SR |
452 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
453 | struct trace_array *tr); | |
fb1b6d8b SN |
454 | extern int trace_selftest_startup_nop(struct tracer *trace, |
455 | struct trace_array *tr); | |
60a11774 SR |
456 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
457 | struct trace_array *tr); | |
a6dd24f8 IM |
458 | extern int trace_selftest_startup_sysprof(struct tracer *trace, |
459 | struct trace_array *tr); | |
80e5ea45 SR |
460 | extern int trace_selftest_startup_branch(struct tracer *trace, |
461 | struct trace_array *tr); | |
60a11774 SR |
462 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
463 | ||
c7aafc54 | 464 | extern void *head_page(struct trace_array_cpu *data); |
72829bc3 | 465 | extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...); |
fc5e27ae PP |
466 | extern void trace_seq_print_cont(struct trace_seq *s, |
467 | struct trace_iterator *iter); | |
15e6cb36 FW |
468 | |
469 | extern int | |
470 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, | |
471 | unsigned long sym_flags); | |
6c6c2796 PP |
472 | extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, |
473 | size_t cnt); | |
72829bc3 | 474 | extern long ns2usecs(cycle_t nsec); |
801fe400 | 475 | extern int trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
c7aafc54 | 476 | |
4e655519 IM |
477 | extern unsigned long trace_flags; |
478 | ||
15e6cb36 FW |
479 | /* Standard output formatting function used for function return traces */ |
480 | #ifdef CONFIG_FUNCTION_RET_TRACER | |
481 | extern enum print_line_t print_return_function(struct trace_iterator *iter); | |
482 | #else | |
483 | static inline enum print_line_t | |
484 | print_return_function(struct trace_iterator *iter) | |
485 | { | |
486 | return TRACE_TYPE_UNHANDLED; | |
487 | } | |
488 | #endif | |
489 | ||
4fcdae83 SR |
490 | /* |
491 | * trace_iterator_flags is an enumeration that defines bit | |
492 | * positions into trace_flags that controls the output. | |
493 | * | |
494 | * NOTE: These bits must match the trace_options array in | |
495 | * trace.c. | |
496 | */ | |
4e655519 IM |
497 | enum trace_iterator_flags { |
498 | TRACE_ITER_PRINT_PARENT = 0x01, | |
499 | TRACE_ITER_SYM_OFFSET = 0x02, | |
500 | TRACE_ITER_SYM_ADDR = 0x04, | |
501 | TRACE_ITER_VERBOSE = 0x08, | |
502 | TRACE_ITER_RAW = 0x10, | |
503 | TRACE_ITER_HEX = 0x20, | |
504 | TRACE_ITER_BIN = 0x40, | |
505 | TRACE_ITER_BLOCK = 0x80, | |
506 | TRACE_ITER_STACKTRACE = 0x100, | |
4ac3ba41 | 507 | TRACE_ITER_SCHED_TREE = 0x200, |
f09ce573 | 508 | TRACE_ITER_PRINTK = 0x400, |
b2a866f9 | 509 | TRACE_ITER_PREEMPTONLY = 0x800, |
9f029e83 | 510 | TRACE_ITER_BRANCH = 0x1000, |
12ef7d44 | 511 | TRACE_ITER_ANNOTATE = 0x2000, |
b54d3de9 TE |
512 | TRACE_ITER_USERSTACKTRACE = 0x4000, |
513 | TRACE_ITER_SYM_USEROBJ = 0x8000 | |
4e655519 IM |
514 | }; |
515 | ||
15e6cb36 FW |
516 | /* |
517 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
518 | * control the output of kernel symbols. | |
519 | */ | |
520 | #define TRACE_ITER_SYM_MASK \ | |
521 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
522 | ||
43a15386 FW |
523 | extern struct tracer nop_trace; |
524 | ||
8f0a056f SR |
525 | /** |
526 | * ftrace_preempt_disable - disable preemption scheduler safe | |
527 | * | |
528 | * When tracing can happen inside the scheduler, there exists | |
529 | * cases that the tracing might happen before the need_resched | |
530 | * flag is checked. If this happens and the tracer calls | |
531 | * preempt_enable (after a disable), a schedule might take place | |
532 | * causing an infinite recursion. | |
533 | * | |
534 | * To prevent this, we read the need_recshed flag before | |
535 | * disabling preemption. When we want to enable preemption we | |
536 | * check the flag, if it is set, then we call preempt_enable_no_resched. | |
537 | * Otherwise, we call preempt_enable. | |
538 | * | |
539 | * The rational for doing the above is that if need resched is set | |
540 | * and we have yet to reschedule, we are either in an atomic location | |
541 | * (where we do not need to check for scheduling) or we are inside | |
542 | * the scheduler and do not want to resched. | |
543 | */ | |
544 | static inline int ftrace_preempt_disable(void) | |
545 | { | |
546 | int resched; | |
547 | ||
548 | resched = need_resched(); | |
549 | preempt_disable_notrace(); | |
550 | ||
551 | return resched; | |
552 | } | |
553 | ||
554 | /** | |
555 | * ftrace_preempt_enable - enable preemption scheduler safe | |
556 | * @resched: the return value from ftrace_preempt_disable | |
557 | * | |
558 | * This is a scheduler safe way to enable preemption and not miss | |
559 | * any preemption checks. The disabled saved the state of preemption. | |
560 | * If resched is set, then we were either inside an atomic or | |
561 | * are inside the scheduler (we would have already scheduled | |
562 | * otherwise). In this case, we do not want to call normal | |
563 | * preempt_enable, but preempt_enable_no_resched instead. | |
564 | */ | |
565 | static inline void ftrace_preempt_enable(int resched) | |
566 | { | |
567 | if (resched) | |
568 | preempt_enable_no_resched_notrace(); | |
569 | else | |
570 | preempt_enable_notrace(); | |
571 | } | |
572 | ||
2ed84eeb | 573 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
574 | extern int enable_branch_tracing(struct trace_array *tr); |
575 | extern void disable_branch_tracing(void); | |
576 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 577 | { |
9f029e83 SR |
578 | if (trace_flags & TRACE_ITER_BRANCH) |
579 | return enable_branch_tracing(tr); | |
52f232cb SR |
580 | return 0; |
581 | } | |
9f029e83 | 582 | static inline void trace_branch_disable(void) |
52f232cb SR |
583 | { |
584 | /* due to races, always disable */ | |
9f029e83 | 585 | disable_branch_tracing(); |
52f232cb SR |
586 | } |
587 | #else | |
9f029e83 | 588 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
589 | { |
590 | return 0; | |
591 | } | |
9f029e83 | 592 | static inline void trace_branch_disable(void) |
52f232cb SR |
593 | { |
594 | } | |
2ed84eeb | 595 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 596 | |
bc0c38d1 | 597 | #endif /* _LINUX_KERNEL_TRACE_H */ |