Commit | Line | Data |
---|---|---|
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, | |
19 | TRACE_STACK, | |
dd0e545f | 20 | TRACE_PRINT, |
72829bc3 | 21 | TRACE_SPECIAL, |
bd8ac686 PP |
22 | TRACE_MMIO_RW, |
23 | TRACE_MMIO_MAP, | |
9f029e83 | 24 | TRACE_BRANCH, |
74239072 FW |
25 | TRACE_BOOT_CALL, |
26 | TRACE_BOOT_RET, | |
287b6e68 FW |
27 | TRACE_GRAPH_RET, |
28 | TRACE_GRAPH_ENT, | |
02b67518 | 29 | TRACE_USER_STACK, |
a93751ca | 30 | TRACE_HW_BRANCHES, |
f3f47a67 | 31 | TRACE_POWER, |
72829bc3 TG |
32 | |
33 | __TRACE_LAST_TYPE | |
34 | }; | |
35 | ||
777e208d SR |
36 | /* |
37 | * The trace entry - the most basic unit of tracing. This is what | |
38 | * is printed in the end as a single line in the trace output, such as: | |
39 | * | |
40 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
41 | */ | |
42 | struct trace_entry { | |
43 | unsigned char type; | |
44 | unsigned char cpu; | |
45 | unsigned char flags; | |
46 | unsigned char preempt_count; | |
47 | int pid; | |
02b67518 | 48 | int tgid; |
777e208d SR |
49 | }; |
50 | ||
bc0c38d1 SR |
51 | /* |
52 | * Function trace entry - function address and parent function addres: | |
53 | */ | |
54 | struct ftrace_entry { | |
777e208d | 55 | struct trace_entry ent; |
bc0c38d1 SR |
56 | unsigned long ip; |
57 | unsigned long parent_ip; | |
58 | }; | |
15e6cb36 | 59 | |
287b6e68 FW |
60 | /* Function call entry */ |
61 | struct ftrace_graph_ent_entry { | |
62 | struct trace_entry ent; | |
63 | struct ftrace_graph_ent graph_ent; | |
64 | }; | |
65 | ||
15e6cb36 | 66 | /* Function return entry */ |
287b6e68 FW |
67 | struct ftrace_graph_ret_entry { |
68 | struct trace_entry ent; | |
69 | struct ftrace_graph_ret ret; | |
15e6cb36 | 70 | }; |
d13744cd | 71 | extern struct tracer boot_tracer; |
bc0c38d1 SR |
72 | |
73 | /* | |
74 | * Context switch trace entry - which task (and prio) we switched from/to: | |
75 | */ | |
76 | struct ctx_switch_entry { | |
777e208d | 77 | struct trace_entry ent; |
bc0c38d1 SR |
78 | unsigned int prev_pid; |
79 | unsigned char prev_prio; | |
80 | unsigned char prev_state; | |
81 | unsigned int next_pid; | |
82 | unsigned char next_prio; | |
bac524d3 | 83 | unsigned char next_state; |
80b5e940 | 84 | unsigned int next_cpu; |
bc0c38d1 SR |
85 | }; |
86 | ||
f0a920d5 IM |
87 | /* |
88 | * Special (free-form) trace entry: | |
89 | */ | |
90 | struct special_entry { | |
777e208d | 91 | struct trace_entry ent; |
f0a920d5 IM |
92 | unsigned long arg1; |
93 | unsigned long arg2; | |
94 | unsigned long arg3; | |
95 | }; | |
96 | ||
86387f7e IM |
97 | /* |
98 | * Stack-trace entry: | |
99 | */ | |
100 | ||
74f4e369 | 101 | #define FTRACE_STACK_ENTRIES 8 |
86387f7e IM |
102 | |
103 | struct stack_entry { | |
777e208d | 104 | struct trace_entry ent; |
86387f7e IM |
105 | unsigned long caller[FTRACE_STACK_ENTRIES]; |
106 | }; | |
107 | ||
02b67518 TE |
108 | struct userstack_entry { |
109 | struct trace_entry ent; | |
110 | unsigned long caller[FTRACE_STACK_ENTRIES]; | |
111 | }; | |
112 | ||
dd0e545f SR |
113 | /* |
114 | * ftrace_printk entry: | |
115 | */ | |
116 | struct print_entry { | |
777e208d | 117 | struct trace_entry ent; |
dd0e545f | 118 | unsigned long ip; |
1fd8f2a3 | 119 | int depth; |
dd0e545f SR |
120 | char buf[]; |
121 | }; | |
122 | ||
777e208d SR |
123 | #define TRACE_OLD_SIZE 88 |
124 | ||
125 | struct trace_field_cont { | |
126 | unsigned char type; | |
127 | /* Temporary till we get rid of this completely */ | |
128 | char buf[TRACE_OLD_SIZE - 1]; | |
129 | }; | |
130 | ||
131 | struct trace_mmiotrace_rw { | |
132 | struct trace_entry ent; | |
133 | struct mmiotrace_rw rw; | |
134 | }; | |
135 | ||
136 | struct trace_mmiotrace_map { | |
137 | struct trace_entry ent; | |
138 | struct mmiotrace_map map; | |
139 | }; | |
140 | ||
74239072 | 141 | struct trace_boot_call { |
777e208d | 142 | struct trace_entry ent; |
74239072 FW |
143 | struct boot_trace_call boot_call; |
144 | }; | |
145 | ||
146 | struct trace_boot_ret { | |
147 | struct trace_entry ent; | |
148 | struct boot_trace_ret boot_ret; | |
777e208d SR |
149 | }; |
150 | ||
52f232cb SR |
151 | #define TRACE_FUNC_SIZE 30 |
152 | #define TRACE_FILE_SIZE 20 | |
9f029e83 | 153 | struct trace_branch { |
52f232cb SR |
154 | struct trace_entry ent; |
155 | unsigned line; | |
156 | char func[TRACE_FUNC_SIZE+1]; | |
157 | char file[TRACE_FILE_SIZE+1]; | |
158 | char correct; | |
159 | }; | |
160 | ||
a93751ca | 161 | struct hw_branch_entry { |
1e9b51c2 | 162 | struct trace_entry ent; |
a93751ca MM |
163 | u64 from; |
164 | u64 to; | |
1e9b51c2 MM |
165 | }; |
166 | ||
f3f47a67 AV |
167 | struct trace_power { |
168 | struct trace_entry ent; | |
169 | struct power_trace state_data; | |
170 | }; | |
171 | ||
fc5e27ae PP |
172 | /* |
173 | * trace_flag_type is an enumeration that holds different | |
174 | * states when a trace occurs. These are: | |
9244489a SR |
175 | * IRQS_OFF - interrupts were disabled |
176 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags | |
177 | * NEED_RESCED - reschedule is requested | |
178 | * HARDIRQ - inside an interrupt handler | |
179 | * SOFTIRQ - inside a softirq handler | |
fc5e27ae PP |
180 | */ |
181 | enum trace_flag_type { | |
182 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
183 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
184 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
185 | TRACE_FLAG_HARDIRQ = 0x08, | |
186 | TRACE_FLAG_SOFTIRQ = 0x10, | |
fc5e27ae PP |
187 | }; |
188 | ||
5bf9a1ee | 189 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 SR |
190 | |
191 | /* | |
192 | * The CPU trace array - it consists of thousands of trace entries | |
193 | * plus some other descriptor data: (for example which task started | |
194 | * the trace, etc.) | |
195 | */ | |
196 | struct trace_array_cpu { | |
bc0c38d1 | 197 | atomic_t disabled; |
4e3c3333 | 198 | |
c7aafc54 | 199 | /* these fields get copied into max-trace: */ |
c7aafc54 | 200 | unsigned long trace_idx; |
53d0aa77 | 201 | unsigned long overrun; |
bc0c38d1 SR |
202 | unsigned long saved_latency; |
203 | unsigned long critical_start; | |
204 | unsigned long critical_end; | |
205 | unsigned long critical_sequence; | |
206 | unsigned long nice; | |
207 | unsigned long policy; | |
208 | unsigned long rt_priority; | |
209 | cycle_t preempt_timestamp; | |
210 | pid_t pid; | |
211 | uid_t uid; | |
212 | char comm[TASK_COMM_LEN]; | |
213 | }; | |
214 | ||
215 | struct trace_iterator; | |
216 | ||
217 | /* | |
218 | * The trace array - an array of per-CPU trace arrays. This is the | |
219 | * highest level data structure that individual tracers deal with. | |
220 | * They have on/off state as well: | |
221 | */ | |
222 | struct trace_array { | |
3928a8a2 | 223 | struct ring_buffer *buffer; |
bc0c38d1 | 224 | unsigned long entries; |
bc0c38d1 SR |
225 | int cpu; |
226 | cycle_t time_start; | |
b3806b43 | 227 | struct task_struct *waiter; |
bc0c38d1 SR |
228 | struct trace_array_cpu *data[NR_CPUS]; |
229 | }; | |
230 | ||
7104f300 SR |
231 | #define FTRACE_CMP_TYPE(var, type) \ |
232 | __builtin_types_compatible_p(typeof(var), type *) | |
233 | ||
234 | #undef IF_ASSIGN | |
235 | #define IF_ASSIGN(var, entry, etype, id) \ | |
236 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
237 | var = (typeof(var))(entry); \ | |
238 | WARN_ON(id && (entry)->type != id); \ | |
239 | break; \ | |
240 | } | |
241 | ||
242 | /* Will cause compile errors if type is not found. */ | |
243 | extern void __ftrace_bad_type(void); | |
244 | ||
245 | /* | |
246 | * The trace_assign_type is a verifier that the entry type is | |
247 | * the same as the type being assigned. To add new types simply | |
248 | * add a line with the following format: | |
249 | * | |
250 | * IF_ASSIGN(var, ent, type, id); | |
251 | * | |
252 | * Where "type" is the trace type that includes the trace_entry | |
253 | * as the "ent" item. And "id" is the trace identifier that is | |
254 | * used in the trace_type enum. | |
255 | * | |
256 | * If the type can have more than one id, then use zero. | |
257 | */ | |
258 | #define trace_assign_type(var, ent) \ | |
259 | do { \ | |
260 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
261 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 262 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 263 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 SR |
264 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
265 | IF_ASSIGN(var, ent, struct special_entry, 0); \ | |
266 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ | |
267 | TRACE_MMIO_RW); \ | |
268 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
269 | TRACE_MMIO_MAP); \ | |
74239072 FW |
270 | IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\ |
271 | IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\ | |
9f029e83 | 272 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
273 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
274 | TRACE_GRAPH_ENT); \ | |
275 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
276 | TRACE_GRAPH_RET); \ | |
a93751ca | 277 | IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\ |
f3f47a67 | 278 | IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \ |
7104f300 SR |
279 | __ftrace_bad_type(); \ |
280 | } while (0) | |
2c4f035f FW |
281 | |
282 | /* Return values for print_line callback */ | |
283 | enum print_line_t { | |
284 | TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ | |
285 | TRACE_TYPE_HANDLED = 1, | |
286 | TRACE_TYPE_UNHANDLED = 2 /* Relay to other output functions */ | |
287 | }; | |
288 | ||
adf9f195 FW |
289 | |
290 | /* | |
291 | * An option specific to a tracer. This is a boolean value. | |
292 | * The bit is the bit index that sets its value on the | |
293 | * flags value in struct tracer_flags. | |
294 | */ | |
295 | struct tracer_opt { | |
296 | const char *name; /* Will appear on the trace_options file */ | |
297 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
298 | }; | |
299 | ||
300 | /* | |
301 | * The set of specific options for a tracer. Your tracer | |
302 | * have to set the initial value of the flags val. | |
303 | */ | |
304 | struct tracer_flags { | |
305 | u32 val; | |
306 | struct tracer_opt *opts; | |
307 | }; | |
308 | ||
309 | /* Makes more easy to define a tracer opt */ | |
310 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
311 | ||
bc0c38d1 SR |
312 | /* |
313 | * A specific tracer, represented by methods that operate on a trace array: | |
314 | */ | |
315 | struct tracer { | |
316 | const char *name; | |
1c80025a FW |
317 | /* Your tracer should raise a warning if init fails */ |
318 | int (*init)(struct trace_array *tr); | |
bc0c38d1 | 319 | void (*reset)(struct trace_array *tr); |
9036990d SR |
320 | void (*start)(struct trace_array *tr); |
321 | void (*stop)(struct trace_array *tr); | |
bc0c38d1 | 322 | void (*open)(struct trace_iterator *iter); |
107bad8b | 323 | void (*pipe_open)(struct trace_iterator *iter); |
bc0c38d1 | 324 | void (*close)(struct trace_iterator *iter); |
107bad8b SR |
325 | ssize_t (*read)(struct trace_iterator *iter, |
326 | struct file *filp, char __user *ubuf, | |
327 | size_t cnt, loff_t *ppos); | |
60a11774 SR |
328 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
329 | int (*selftest)(struct tracer *trace, | |
330 | struct trace_array *tr); | |
331 | #endif | |
8bba1bf5 | 332 | void (*print_header)(struct seq_file *m); |
2c4f035f | 333 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 FW |
334 | /* If you handled the flag setting, return 0 */ |
335 | int (*set_flag)(u32 old_flags, u32 bit, int set); | |
bc0c38d1 SR |
336 | struct tracer *next; |
337 | int print_max; | |
adf9f195 | 338 | struct tracer_flags *flags; |
bc0c38d1 SR |
339 | }; |
340 | ||
214023c3 SR |
341 | struct trace_seq { |
342 | unsigned char buffer[PAGE_SIZE]; | |
343 | unsigned int len; | |
6c6c2796 | 344 | unsigned int readpos; |
214023c3 SR |
345 | }; |
346 | ||
bc0c38d1 SR |
347 | /* |
348 | * Trace iterator - used by printout routines who present trace | |
349 | * results to users and which routines might sleep, etc: | |
350 | */ | |
351 | struct trace_iterator { | |
352 | struct trace_array *tr; | |
353 | struct tracer *trace; | |
107bad8b | 354 | void *private; |
3928a8a2 | 355 | struct ring_buffer_iter *buffer_iter[NR_CPUS]; |
4e3c3333 | 356 | |
53d0aa77 SR |
357 | /* The below is zeroed out in pipe_read */ |
358 | struct trace_seq seq; | |
bc0c38d1 | 359 | struct trace_entry *ent; |
4e3c3333 | 360 | int cpu; |
3928a8a2 | 361 | u64 ts; |
4e3c3333 | 362 | |
bc0c38d1 SR |
363 | unsigned long iter_flags; |
364 | loff_t pos; | |
4c11d7ae | 365 | long idx; |
a309720c SR |
366 | |
367 | cpumask_t started; | |
bc0c38d1 SR |
368 | }; |
369 | ||
9036990d | 370 | int tracing_is_enabled(void); |
45dcd8b8 | 371 | void trace_wake_up(void); |
3928a8a2 | 372 | void tracing_reset(struct trace_array *tr, int cpu); |
213cc060 | 373 | void tracing_reset_online_cpus(struct trace_array *tr); |
bc0c38d1 SR |
374 | int tracing_open_generic(struct inode *inode, struct file *filp); |
375 | struct dentry *tracing_init_dentry(void); | |
d618b3e6 IM |
376 | void init_tracer_sysprof_debugfs(struct dentry *d_tracer); |
377 | ||
45dcd8b8 PP |
378 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
379 | struct trace_array_cpu *data); | |
380 | void tracing_generic_entry_update(struct trace_entry *entry, | |
38697053 SR |
381 | unsigned long flags, |
382 | int pc); | |
45dcd8b8 | 383 | |
bc0c38d1 SR |
384 | void ftrace(struct trace_array *tr, |
385 | struct trace_array_cpu *data, | |
386 | unsigned long ip, | |
387 | unsigned long parent_ip, | |
38697053 | 388 | unsigned long flags, int pc); |
bc0c38d1 SR |
389 | void tracing_sched_switch_trace(struct trace_array *tr, |
390 | struct trace_array_cpu *data, | |
391 | struct task_struct *prev, | |
392 | struct task_struct *next, | |
38697053 | 393 | unsigned long flags, int pc); |
bc0c38d1 | 394 | void tracing_record_cmdline(struct task_struct *tsk); |
57422797 IM |
395 | |
396 | void tracing_sched_wakeup_trace(struct trace_array *tr, | |
397 | struct trace_array_cpu *data, | |
398 | struct task_struct *wakee, | |
399 | struct task_struct *cur, | |
38697053 | 400 | unsigned long flags, int pc); |
f0a920d5 IM |
401 | void trace_special(struct trace_array *tr, |
402 | struct trace_array_cpu *data, | |
403 | unsigned long arg1, | |
404 | unsigned long arg2, | |
38697053 | 405 | unsigned long arg3, int pc); |
6fb44b71 SR |
406 | void trace_function(struct trace_array *tr, |
407 | struct trace_array_cpu *data, | |
408 | unsigned long ip, | |
409 | unsigned long parent_ip, | |
38697053 | 410 | unsigned long flags, int pc); |
bc0c38d1 | 411 | |
287b6e68 | 412 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 413 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
a93751ca | 414 | void trace_hw_branch(struct trace_array *tr, u64 from, u64 to); |
1e9b51c2 | 415 | |
41bc8144 SR |
416 | void tracing_start_cmdline_record(void); |
417 | void tracing_stop_cmdline_record(void); | |
e168e051 SR |
418 | void tracing_sched_switch_assign_trace(struct trace_array *tr); |
419 | void tracing_stop_sched_switch_record(void); | |
420 | void tracing_start_sched_switch_record(void); | |
bc0c38d1 SR |
421 | int register_tracer(struct tracer *type); |
422 | void unregister_tracer(struct tracer *type); | |
423 | ||
424 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
425 | ||
426 | extern unsigned long tracing_max_latency; | |
427 | extern unsigned long tracing_thresh; | |
428 | ||
429 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); | |
430 | void update_max_tr_single(struct trace_array *tr, | |
431 | struct task_struct *tsk, int cpu); | |
432 | ||
e309b41d | 433 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 434 | |
606576ce | 435 | #ifdef CONFIG_FUNCTION_TRACER |
001b6767 SR |
436 | void tracing_start_function_trace(void); |
437 | void tracing_stop_function_trace(void); | |
438 | #else | |
439 | # define tracing_start_function_trace() do { } while (0) | |
440 | # define tracing_stop_function_trace() do { } while (0) | |
441 | #endif | |
442 | ||
bc0c38d1 SR |
443 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER |
444 | typedef void | |
445 | (*tracer_switch_func_t)(void *private, | |
5b82a1b0 | 446 | void *__rq, |
bc0c38d1 SR |
447 | struct task_struct *prev, |
448 | struct task_struct *next); | |
449 | ||
450 | struct tracer_switch_ops { | |
451 | tracer_switch_func_t func; | |
452 | void *private; | |
453 | struct tracer_switch_ops *next; | |
454 | }; | |
455 | ||
660c7f9b | 456 | char *trace_find_cmdline(int pid); |
bc0c38d1 SR |
457 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ |
458 | ||
459 | #ifdef CONFIG_DYNAMIC_FTRACE | |
460 | extern unsigned long ftrace_update_tot_cnt; | |
d05cdb25 SR |
461 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
462 | extern int DYN_FTRACE_TEST_NAME(void); | |
bc0c38d1 SR |
463 | #endif |
464 | ||
60a11774 | 465 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
466 | extern int trace_selftest_startup_function(struct tracer *trace, |
467 | struct trace_array *tr); | |
60a11774 SR |
468 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
469 | struct trace_array *tr); | |
60a11774 SR |
470 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
471 | struct trace_array *tr); | |
60a11774 SR |
472 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
473 | struct trace_array *tr); | |
60a11774 SR |
474 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
475 | struct trace_array *tr); | |
fb1b6d8b SN |
476 | extern int trace_selftest_startup_nop(struct tracer *trace, |
477 | struct trace_array *tr); | |
60a11774 SR |
478 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
479 | struct trace_array *tr); | |
a6dd24f8 IM |
480 | extern int trace_selftest_startup_sysprof(struct tracer *trace, |
481 | struct trace_array *tr); | |
80e5ea45 SR |
482 | extern int trace_selftest_startup_branch(struct tracer *trace, |
483 | struct trace_array *tr); | |
60a11774 SR |
484 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
485 | ||
c7aafc54 | 486 | extern void *head_page(struct trace_array_cpu *data); |
72829bc3 | 487 | extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...); |
15e6cb36 FW |
488 | extern int |
489 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, | |
490 | unsigned long sym_flags); | |
6c6c2796 PP |
491 | extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, |
492 | size_t cnt); | |
72829bc3 | 493 | extern long ns2usecs(cycle_t nsec); |
1fd8f2a3 FW |
494 | extern int |
495 | trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args); | |
c7aafc54 | 496 | |
4e655519 IM |
497 | extern unsigned long trace_flags; |
498 | ||
15e6cb36 | 499 | /* Standard output formatting function used for function return traces */ |
fb52607a FW |
500 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
501 | extern enum print_line_t print_graph_function(struct trace_iterator *iter); | |
ea4e2bc4 SR |
502 | |
503 | #ifdef CONFIG_DYNAMIC_FTRACE | |
504 | /* TODO: make this variable */ | |
505 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
506 | extern int ftrace_graph_count; | |
507 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
508 | ||
509 | static inline int ftrace_graph_addr(unsigned long addr) | |
510 | { | |
511 | int i; | |
512 | ||
513 | if (!ftrace_graph_count || test_tsk_trace_graph(current)) | |
514 | return 1; | |
515 | ||
516 | for (i = 0; i < ftrace_graph_count; i++) { | |
517 | if (addr == ftrace_graph_funcs[i]) | |
518 | return 1; | |
519 | } | |
520 | ||
521 | return 0; | |
522 | } | |
15e6cb36 | 523 | #else |
ea4e2bc4 SR |
524 | static inline int ftrace_trace_addr(unsigned long addr) |
525 | { | |
6b253930 IM |
526 | return 1; |
527 | } | |
528 | static inline int ftrace_graph_addr(unsigned long addr) | |
529 | { | |
530 | return 1; | |
ea4e2bc4 SR |
531 | } |
532 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
533 | ||
534 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
15e6cb36 | 535 | static inline enum print_line_t |
fb52607a | 536 | print_graph_function(struct trace_iterator *iter) |
15e6cb36 FW |
537 | { |
538 | return TRACE_TYPE_UNHANDLED; | |
539 | } | |
ea4e2bc4 | 540 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 541 | |
978f3a45 | 542 | extern struct pid *ftrace_pid_trace; |
804a6851 SR |
543 | |
544 | static inline int ftrace_trace_task(struct task_struct *task) | |
545 | { | |
77d683f3 | 546 | if (!ftrace_pid_trace) |
804a6851 SR |
547 | return 1; |
548 | ||
549 | return test_tsk_trace_trace(task); | |
550 | } | |
551 | ||
4fcdae83 SR |
552 | /* |
553 | * trace_iterator_flags is an enumeration that defines bit | |
554 | * positions into trace_flags that controls the output. | |
555 | * | |
556 | * NOTE: These bits must match the trace_options array in | |
557 | * trace.c. | |
558 | */ | |
4e655519 IM |
559 | enum trace_iterator_flags { |
560 | TRACE_ITER_PRINT_PARENT = 0x01, | |
561 | TRACE_ITER_SYM_OFFSET = 0x02, | |
562 | TRACE_ITER_SYM_ADDR = 0x04, | |
563 | TRACE_ITER_VERBOSE = 0x08, | |
564 | TRACE_ITER_RAW = 0x10, | |
565 | TRACE_ITER_HEX = 0x20, | |
566 | TRACE_ITER_BIN = 0x40, | |
567 | TRACE_ITER_BLOCK = 0x80, | |
568 | TRACE_ITER_STACKTRACE = 0x100, | |
4ac3ba41 | 569 | TRACE_ITER_SCHED_TREE = 0x200, |
f09ce573 | 570 | TRACE_ITER_PRINTK = 0x400, |
b2a866f9 | 571 | TRACE_ITER_PREEMPTONLY = 0x800, |
9f029e83 | 572 | TRACE_ITER_BRANCH = 0x1000, |
12ef7d44 | 573 | TRACE_ITER_ANNOTATE = 0x2000, |
b54d3de9 | 574 | TRACE_ITER_USERSTACKTRACE = 0x4000, |
66896a85 FW |
575 | TRACE_ITER_SYM_USEROBJ = 0x8000, |
576 | TRACE_ITER_PRINTK_MSGONLY = 0x10000 | |
4e655519 IM |
577 | }; |
578 | ||
15e6cb36 FW |
579 | /* |
580 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
581 | * control the output of kernel symbols. | |
582 | */ | |
583 | #define TRACE_ITER_SYM_MASK \ | |
584 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
585 | ||
43a15386 FW |
586 | extern struct tracer nop_trace; |
587 | ||
8f0a056f SR |
588 | /** |
589 | * ftrace_preempt_disable - disable preemption scheduler safe | |
590 | * | |
591 | * When tracing can happen inside the scheduler, there exists | |
592 | * cases that the tracing might happen before the need_resched | |
593 | * flag is checked. If this happens and the tracer calls | |
594 | * preempt_enable (after a disable), a schedule might take place | |
595 | * causing an infinite recursion. | |
596 | * | |
597 | * To prevent this, we read the need_recshed flag before | |
598 | * disabling preemption. When we want to enable preemption we | |
599 | * check the flag, if it is set, then we call preempt_enable_no_resched. | |
600 | * Otherwise, we call preempt_enable. | |
601 | * | |
602 | * The rational for doing the above is that if need resched is set | |
603 | * and we have yet to reschedule, we are either in an atomic location | |
604 | * (where we do not need to check for scheduling) or we are inside | |
605 | * the scheduler and do not want to resched. | |
606 | */ | |
607 | static inline int ftrace_preempt_disable(void) | |
608 | { | |
609 | int resched; | |
610 | ||
611 | resched = need_resched(); | |
612 | preempt_disable_notrace(); | |
613 | ||
614 | return resched; | |
615 | } | |
616 | ||
617 | /** | |
618 | * ftrace_preempt_enable - enable preemption scheduler safe | |
619 | * @resched: the return value from ftrace_preempt_disable | |
620 | * | |
621 | * This is a scheduler safe way to enable preemption and not miss | |
622 | * any preemption checks. The disabled saved the state of preemption. | |
623 | * If resched is set, then we were either inside an atomic or | |
624 | * are inside the scheduler (we would have already scheduled | |
625 | * otherwise). In this case, we do not want to call normal | |
626 | * preempt_enable, but preempt_enable_no_resched instead. | |
627 | */ | |
628 | static inline void ftrace_preempt_enable(int resched) | |
629 | { | |
630 | if (resched) | |
631 | preempt_enable_no_resched_notrace(); | |
632 | else | |
633 | preempt_enable_notrace(); | |
634 | } | |
635 | ||
2ed84eeb | 636 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
637 | extern int enable_branch_tracing(struct trace_array *tr); |
638 | extern void disable_branch_tracing(void); | |
639 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 640 | { |
9f029e83 SR |
641 | if (trace_flags & TRACE_ITER_BRANCH) |
642 | return enable_branch_tracing(tr); | |
52f232cb SR |
643 | return 0; |
644 | } | |
9f029e83 | 645 | static inline void trace_branch_disable(void) |
52f232cb SR |
646 | { |
647 | /* due to races, always disable */ | |
9f029e83 | 648 | disable_branch_tracing(); |
52f232cb SR |
649 | } |
650 | #else | |
9f029e83 | 651 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
652 | { |
653 | return 0; | |
654 | } | |
9f029e83 | 655 | static inline void trace_branch_disable(void) |
52f232cb SR |
656 | { |
657 | } | |
2ed84eeb | 658 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 659 | |
bc0c38d1 | 660 | #endif /* _LINUX_KERNEL_TRACE_H */ |