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> |
02af61bb | 12 | #include <linux/kmemtrace.h> |
12922110 | 13 | #include <trace/power.h> |
bc0c38d1 | 14 | |
9504504c | 15 | #include <linux/trace_seq.h> |
97f20251 | 16 | #include <linux/ftrace_event.h> |
9504504c | 17 | |
72829bc3 TG |
18 | enum trace_type { |
19 | __TRACE_FIRST_TYPE = 0, | |
20 | ||
21 | TRACE_FN, | |
22 | TRACE_CTX, | |
23 | TRACE_WAKE, | |
24 | TRACE_STACK, | |
dd0e545f | 25 | TRACE_PRINT, |
48ead020 | 26 | TRACE_BPRINT, |
72829bc3 | 27 | TRACE_SPECIAL, |
bd8ac686 PP |
28 | TRACE_MMIO_RW, |
29 | TRACE_MMIO_MAP, | |
9f029e83 | 30 | TRACE_BRANCH, |
74239072 FW |
31 | TRACE_BOOT_CALL, |
32 | TRACE_BOOT_RET, | |
287b6e68 FW |
33 | TRACE_GRAPH_RET, |
34 | TRACE_GRAPH_ENT, | |
02b67518 | 35 | TRACE_USER_STACK, |
a93751ca | 36 | TRACE_HW_BRANCHES, |
36994e58 FW |
37 | TRACE_KMEM_ALLOC, |
38 | TRACE_KMEM_FREE, | |
f3f47a67 | 39 | TRACE_POWER, |
c71a8961 | 40 | TRACE_BLK, |
72829bc3 | 41 | |
f0868d1e | 42 | __TRACE_LAST_TYPE, |
72829bc3 TG |
43 | }; |
44 | ||
bc0c38d1 SR |
45 | /* |
46 | * Function trace entry - function address and parent function addres: | |
47 | */ | |
48 | struct ftrace_entry { | |
777e208d | 49 | struct trace_entry ent; |
bc0c38d1 SR |
50 | unsigned long ip; |
51 | unsigned long parent_ip; | |
52 | }; | |
15e6cb36 | 53 | |
287b6e68 FW |
54 | /* Function call entry */ |
55 | struct ftrace_graph_ent_entry { | |
b91facc3 | 56 | struct trace_entry ent; |
287b6e68 FW |
57 | struct ftrace_graph_ent graph_ent; |
58 | }; | |
59 | ||
15e6cb36 | 60 | /* Function return entry */ |
287b6e68 | 61 | struct ftrace_graph_ret_entry { |
b91facc3 | 62 | struct trace_entry ent; |
287b6e68 | 63 | struct ftrace_graph_ret ret; |
15e6cb36 | 64 | }; |
d13744cd | 65 | extern struct tracer boot_tracer; |
bc0c38d1 SR |
66 | |
67 | /* | |
68 | * Context switch trace entry - which task (and prio) we switched from/to: | |
69 | */ | |
70 | struct ctx_switch_entry { | |
777e208d | 71 | struct trace_entry ent; |
bc0c38d1 SR |
72 | unsigned int prev_pid; |
73 | unsigned char prev_prio; | |
74 | unsigned char prev_state; | |
75 | unsigned int next_pid; | |
76 | unsigned char next_prio; | |
bac524d3 | 77 | unsigned char next_state; |
80b5e940 | 78 | unsigned int next_cpu; |
bc0c38d1 SR |
79 | }; |
80 | ||
f0a920d5 IM |
81 | /* |
82 | * Special (free-form) trace entry: | |
83 | */ | |
84 | struct special_entry { | |
777e208d | 85 | struct trace_entry ent; |
f0a920d5 IM |
86 | unsigned long arg1; |
87 | unsigned long arg2; | |
88 | unsigned long arg3; | |
89 | }; | |
90 | ||
86387f7e IM |
91 | /* |
92 | * Stack-trace entry: | |
93 | */ | |
94 | ||
74f4e369 | 95 | #define FTRACE_STACK_ENTRIES 8 |
86387f7e IM |
96 | |
97 | struct stack_entry { | |
777e208d | 98 | struct trace_entry ent; |
86387f7e IM |
99 | unsigned long caller[FTRACE_STACK_ENTRIES]; |
100 | }; | |
101 | ||
02b67518 TE |
102 | struct userstack_entry { |
103 | struct trace_entry ent; | |
104 | unsigned long caller[FTRACE_STACK_ENTRIES]; | |
105 | }; | |
106 | ||
dd0e545f | 107 | /* |
5e1607a0 | 108 | * trace_printk entry: |
dd0e545f | 109 | */ |
48ead020 | 110 | struct bprint_entry { |
777e208d | 111 | struct trace_entry ent; |
9de36825 | 112 | unsigned long ip; |
769b0441 | 113 | const char *fmt; |
9de36825 | 114 | u32 buf[]; |
1427cdf0 | 115 | }; |
1427cdf0 | 116 | |
48ead020 FW |
117 | struct print_entry { |
118 | struct trace_entry ent; | |
119 | unsigned long ip; | |
48ead020 FW |
120 | char buf[]; |
121 | }; | |
122 | ||
777e208d SR |
123 | struct trace_mmiotrace_rw { |
124 | struct trace_entry ent; | |
125 | struct mmiotrace_rw rw; | |
126 | }; | |
127 | ||
128 | struct trace_mmiotrace_map { | |
129 | struct trace_entry ent; | |
130 | struct mmiotrace_map map; | |
131 | }; | |
132 | ||
74239072 | 133 | struct trace_boot_call { |
777e208d | 134 | struct trace_entry ent; |
74239072 FW |
135 | struct boot_trace_call boot_call; |
136 | }; | |
137 | ||
138 | struct trace_boot_ret { | |
139 | struct trace_entry ent; | |
140 | struct boot_trace_ret boot_ret; | |
777e208d SR |
141 | }; |
142 | ||
52f232cb SR |
143 | #define TRACE_FUNC_SIZE 30 |
144 | #define TRACE_FILE_SIZE 20 | |
9f029e83 | 145 | struct trace_branch { |
52f232cb SR |
146 | struct trace_entry ent; |
147 | unsigned line; | |
148 | char func[TRACE_FUNC_SIZE+1]; | |
149 | char file[TRACE_FILE_SIZE+1]; | |
150 | char correct; | |
151 | }; | |
152 | ||
a93751ca | 153 | struct hw_branch_entry { |
1e9b51c2 | 154 | struct trace_entry ent; |
a93751ca MM |
155 | u64 from; |
156 | u64 to; | |
1e9b51c2 MM |
157 | }; |
158 | ||
f3f47a67 AV |
159 | struct trace_power { |
160 | struct trace_entry ent; | |
161 | struct power_trace state_data; | |
162 | }; | |
163 | ||
ca2b84cb EGM |
164 | enum kmemtrace_type_id { |
165 | KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */ | |
166 | KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */ | |
167 | KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */ | |
168 | }; | |
169 | ||
36994e58 FW |
170 | struct kmemtrace_alloc_entry { |
171 | struct trace_entry ent; | |
172 | enum kmemtrace_type_id type_id; | |
173 | unsigned long call_site; | |
174 | const void *ptr; | |
175 | size_t bytes_req; | |
176 | size_t bytes_alloc; | |
177 | gfp_t gfp_flags; | |
178 | int node; | |
179 | }; | |
180 | ||
181 | struct kmemtrace_free_entry { | |
182 | struct trace_entry ent; | |
183 | enum kmemtrace_type_id type_id; | |
184 | unsigned long call_site; | |
185 | const void *ptr; | |
186 | }; | |
187 | ||
bed1ffca FW |
188 | struct syscall_trace_enter { |
189 | struct trace_entry ent; | |
190 | int nr; | |
191 | unsigned long args[]; | |
192 | }; | |
193 | ||
194 | struct syscall_trace_exit { | |
195 | struct trace_entry ent; | |
196 | int nr; | |
197 | unsigned long ret; | |
198 | }; | |
199 | ||
200 | ||
fc5e27ae PP |
201 | /* |
202 | * trace_flag_type is an enumeration that holds different | |
203 | * states when a trace occurs. These are: | |
9244489a | 204 | * IRQS_OFF - interrupts were disabled |
9de36825 | 205 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
9244489a SR |
206 | * NEED_RESCED - reschedule is requested |
207 | * HARDIRQ - inside an interrupt handler | |
208 | * SOFTIRQ - inside a softirq handler | |
fc5e27ae PP |
209 | */ |
210 | enum trace_flag_type { | |
211 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
212 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
213 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
214 | TRACE_FLAG_HARDIRQ = 0x08, | |
215 | TRACE_FLAG_SOFTIRQ = 0x10, | |
fc5e27ae PP |
216 | }; |
217 | ||
5bf9a1ee | 218 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 SR |
219 | |
220 | /* | |
221 | * The CPU trace array - it consists of thousands of trace entries | |
222 | * plus some other descriptor data: (for example which task started | |
223 | * the trace, etc.) | |
224 | */ | |
225 | struct trace_array_cpu { | |
bc0c38d1 | 226 | atomic_t disabled; |
2cadf913 | 227 | void *buffer_page; /* ring buffer spare */ |
4e3c3333 | 228 | |
bc0c38d1 SR |
229 | unsigned long saved_latency; |
230 | unsigned long critical_start; | |
231 | unsigned long critical_end; | |
232 | unsigned long critical_sequence; | |
233 | unsigned long nice; | |
234 | unsigned long policy; | |
235 | unsigned long rt_priority; | |
2f26ebd5 | 236 | unsigned long skipped_entries; |
bc0c38d1 SR |
237 | cycle_t preempt_timestamp; |
238 | pid_t pid; | |
239 | uid_t uid; | |
240 | char comm[TASK_COMM_LEN]; | |
241 | }; | |
242 | ||
bc0c38d1 SR |
243 | /* |
244 | * The trace array - an array of per-CPU trace arrays. This is the | |
245 | * highest level data structure that individual tracers deal with. | |
246 | * They have on/off state as well: | |
247 | */ | |
248 | struct trace_array { | |
3928a8a2 | 249 | struct ring_buffer *buffer; |
bc0c38d1 | 250 | unsigned long entries; |
bc0c38d1 SR |
251 | int cpu; |
252 | cycle_t time_start; | |
b3806b43 | 253 | struct task_struct *waiter; |
bc0c38d1 SR |
254 | struct trace_array_cpu *data[NR_CPUS]; |
255 | }; | |
256 | ||
7104f300 SR |
257 | #define FTRACE_CMP_TYPE(var, type) \ |
258 | __builtin_types_compatible_p(typeof(var), type *) | |
259 | ||
260 | #undef IF_ASSIGN | |
261 | #define IF_ASSIGN(var, entry, etype, id) \ | |
262 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
263 | var = (typeof(var))(entry); \ | |
264 | WARN_ON(id && (entry)->type != id); \ | |
265 | break; \ | |
266 | } | |
267 | ||
268 | /* Will cause compile errors if type is not found. */ | |
269 | extern void __ftrace_bad_type(void); | |
270 | ||
271 | /* | |
272 | * The trace_assign_type is a verifier that the entry type is | |
273 | * the same as the type being assigned. To add new types simply | |
274 | * add a line with the following format: | |
275 | * | |
276 | * IF_ASSIGN(var, ent, type, id); | |
277 | * | |
278 | * Where "type" is the trace type that includes the trace_entry | |
279 | * as the "ent" item. And "id" is the trace identifier that is | |
280 | * used in the trace_type enum. | |
281 | * | |
282 | * If the type can have more than one id, then use zero. | |
283 | */ | |
284 | #define trace_assign_type(var, ent) \ | |
285 | do { \ | |
286 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
287 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 288 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 289 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 290 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 291 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
7104f300 SR |
292 | IF_ASSIGN(var, ent, struct special_entry, 0); \ |
293 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ | |
294 | TRACE_MMIO_RW); \ | |
295 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
296 | TRACE_MMIO_MAP); \ | |
74239072 FW |
297 | IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\ |
298 | IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\ | |
9f029e83 | 299 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
300 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
301 | TRACE_GRAPH_ENT); \ | |
302 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
303 | TRACE_GRAPH_RET); \ | |
a93751ca | 304 | IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\ |
9de36825 | 305 | IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \ |
36994e58 FW |
306 | IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \ |
307 | TRACE_KMEM_ALLOC); \ | |
308 | IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \ | |
309 | TRACE_KMEM_FREE); \ | |
7104f300 SR |
310 | __ftrace_bad_type(); \ |
311 | } while (0) | |
2c4f035f | 312 | |
adf9f195 FW |
313 | /* |
314 | * An option specific to a tracer. This is a boolean value. | |
315 | * The bit is the bit index that sets its value on the | |
316 | * flags value in struct tracer_flags. | |
317 | */ | |
318 | struct tracer_opt { | |
9de36825 IM |
319 | const char *name; /* Will appear on the trace_options file */ |
320 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
321 | }; |
322 | ||
323 | /* | |
324 | * The set of specific options for a tracer. Your tracer | |
325 | * have to set the initial value of the flags val. | |
326 | */ | |
327 | struct tracer_flags { | |
328 | u32 val; | |
9de36825 | 329 | struct tracer_opt *opts; |
adf9f195 FW |
330 | }; |
331 | ||
332 | /* Makes more easy to define a tracer opt */ | |
333 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
334 | ||
034939b6 | 335 | |
6eaaa5d5 FW |
336 | /** |
337 | * struct tracer - a specific tracer and its callbacks to interact with debugfs | |
338 | * @name: the name chosen to select it on the available_tracers file | |
339 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
340 | * @reset: called when one switches to another tracer | |
341 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled) | |
342 | * @stop: called when tracing is paused (echo 0 > tracing_enabled) | |
343 | * @open: called when the trace file is opened | |
344 | * @pipe_open: called when the trace_pipe file is opened | |
345 | * @wait_pipe: override how the user waits for traces on trace_pipe | |
346 | * @close: called when the trace file is released | |
347 | * @read: override the default read callback on trace_pipe | |
348 | * @splice_read: override the default splice_read callback on trace_pipe | |
349 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
350 | * @print_headers: override the first lines that describe your columns | |
351 | * @print_line: callback that prints a trace | |
352 | * @set_flag: signals one of your private flags changed (trace_options file) | |
353 | * @flags: your private flags | |
bc0c38d1 SR |
354 | */ |
355 | struct tracer { | |
356 | const char *name; | |
1c80025a | 357 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 358 | void (*reset)(struct trace_array *tr); |
9036990d SR |
359 | void (*start)(struct trace_array *tr); |
360 | void (*stop)(struct trace_array *tr); | |
bc0c38d1 | 361 | void (*open)(struct trace_iterator *iter); |
107bad8b | 362 | void (*pipe_open)(struct trace_iterator *iter); |
6eaaa5d5 | 363 | void (*wait_pipe)(struct trace_iterator *iter); |
bc0c38d1 | 364 | void (*close)(struct trace_iterator *iter); |
107bad8b SR |
365 | ssize_t (*read)(struct trace_iterator *iter, |
366 | struct file *filp, char __user *ubuf, | |
367 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
368 | ssize_t (*splice_read)(struct trace_iterator *iter, |
369 | struct file *filp, | |
370 | loff_t *ppos, | |
371 | struct pipe_inode_info *pipe, | |
372 | size_t len, | |
373 | unsigned int flags); | |
60a11774 SR |
374 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
375 | int (*selftest)(struct tracer *trace, | |
376 | struct trace_array *tr); | |
377 | #endif | |
8bba1bf5 | 378 | void (*print_header)(struct seq_file *m); |
2c4f035f | 379 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 FW |
380 | /* If you handled the flag setting, return 0 */ |
381 | int (*set_flag)(u32 old_flags, u32 bit, int set); | |
bc0c38d1 SR |
382 | struct tracer *next; |
383 | int print_max; | |
9de36825 | 384 | struct tracer_flags *flags; |
034939b6 | 385 | struct tracer_stat *stats; |
bc0c38d1 SR |
386 | }; |
387 | ||
f9520750 | 388 | |
b04cc6b1 FW |
389 | #define TRACE_PIPE_ALL_CPU -1 |
390 | ||
b6f11df2 | 391 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 392 | int tracing_is_enabled(void); |
45dcd8b8 | 393 | void trace_wake_up(void); |
3928a8a2 | 394 | void tracing_reset(struct trace_array *tr, int cpu); |
213cc060 | 395 | void tracing_reset_online_cpus(struct trace_array *tr); |
9456f0fa SR |
396 | void tracing_reset_current(int cpu); |
397 | void tracing_reset_current_online_cpus(void); | |
bc0c38d1 | 398 | int tracing_open_generic(struct inode *inode, struct file *filp); |
5452af66 FW |
399 | struct dentry *trace_create_file(const char *name, |
400 | mode_t mode, | |
401 | struct dentry *parent, | |
402 | void *data, | |
403 | const struct file_operations *fops); | |
404 | ||
bc0c38d1 | 405 | struct dentry *tracing_init_dentry(void); |
d618b3e6 IM |
406 | void init_tracer_sysprof_debugfs(struct dentry *d_tracer); |
407 | ||
51a763dd ACM |
408 | struct ring_buffer_event; |
409 | ||
e77405ad SR |
410 | struct ring_buffer_event * |
411 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
412 | int type, | |
413 | unsigned long len, | |
414 | unsigned long flags, | |
415 | int pc); | |
416 | void trace_buffer_unlock_commit(struct ring_buffer *buffer, | |
51a763dd ACM |
417 | struct ring_buffer_event *event, |
418 | unsigned long flags, int pc); | |
419 | ||
45dcd8b8 PP |
420 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
421 | struct trace_array_cpu *data); | |
c4a8e8be FW |
422 | |
423 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
424 | int *ent_cpu, u64 *ent_ts); | |
425 | ||
6eaaa5d5 FW |
426 | void default_wait_pipe(struct trace_iterator *iter); |
427 | void poll_wait_pipe(struct trace_iterator *iter); | |
428 | ||
bc0c38d1 SR |
429 | void ftrace(struct trace_array *tr, |
430 | struct trace_array_cpu *data, | |
431 | unsigned long ip, | |
432 | unsigned long parent_ip, | |
38697053 | 433 | unsigned long flags, int pc); |
bc0c38d1 | 434 | void tracing_sched_switch_trace(struct trace_array *tr, |
bc0c38d1 SR |
435 | struct task_struct *prev, |
436 | struct task_struct *next, | |
38697053 | 437 | unsigned long flags, int pc); |
57422797 IM |
438 | |
439 | void tracing_sched_wakeup_trace(struct trace_array *tr, | |
57422797 IM |
440 | struct task_struct *wakee, |
441 | struct task_struct *cur, | |
38697053 | 442 | unsigned long flags, int pc); |
f0a920d5 IM |
443 | void trace_special(struct trace_array *tr, |
444 | struct trace_array_cpu *data, | |
445 | unsigned long arg1, | |
446 | unsigned long arg2, | |
38697053 | 447 | unsigned long arg3, int pc); |
6fb44b71 | 448 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
449 | unsigned long ip, |
450 | unsigned long parent_ip, | |
38697053 | 451 | unsigned long flags, int pc); |
bc0c38d1 | 452 | |
287b6e68 | 453 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 454 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1a0799a8 | 455 | void set_graph_array(struct trace_array *tr); |
1e9b51c2 | 456 | |
41bc8144 SR |
457 | void tracing_start_cmdline_record(void); |
458 | void tracing_stop_cmdline_record(void); | |
e168e051 SR |
459 | void tracing_sched_switch_assign_trace(struct trace_array *tr); |
460 | void tracing_stop_sched_switch_record(void); | |
461 | void tracing_start_sched_switch_record(void); | |
bc0c38d1 SR |
462 | int register_tracer(struct tracer *type); |
463 | void unregister_tracer(struct tracer *type); | |
464 | ||
465 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
466 | ||
5d4a9dba | 467 | #ifdef CONFIG_TRACER_MAX_TRACE |
bc0c38d1 SR |
468 | extern unsigned long tracing_max_latency; |
469 | extern unsigned long tracing_thresh; | |
470 | ||
471 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); | |
472 | void update_max_tr_single(struct trace_array *tr, | |
473 | struct task_struct *tsk, int cpu); | |
5d4a9dba | 474 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 475 | |
c0a0d0d3 | 476 | #ifdef CONFIG_STACKTRACE |
e77405ad | 477 | void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
478 | int skip, int pc); |
479 | ||
e77405ad | 480 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
481 | int pc); |
482 | ||
483 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, | |
484 | int pc); | |
485 | #else | |
486 | static inline void ftrace_trace_stack(struct trace_array *tr, | |
487 | unsigned long flags, int skip, int pc) | |
488 | { | |
489 | } | |
490 | ||
491 | static inline void ftrace_trace_userstack(struct trace_array *tr, | |
492 | unsigned long flags, int pc) | |
493 | { | |
494 | } | |
495 | ||
496 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags, | |
497 | int skip, int pc) | |
498 | { | |
499 | } | |
500 | #endif /* CONFIG_STACKTRACE */ | |
53614991 | 501 | |
e309b41d | 502 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 503 | |
4ca53085 | 504 | extern void trace_find_cmdline(int pid, char comm[]); |
f7d48cbd | 505 | |
bc0c38d1 SR |
506 | #ifdef CONFIG_DYNAMIC_FTRACE |
507 | extern unsigned long ftrace_update_tot_cnt; | |
d05cdb25 SR |
508 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
509 | extern int DYN_FTRACE_TEST_NAME(void); | |
bc0c38d1 SR |
510 | #endif |
511 | ||
020e5f85 LZ |
512 | extern int ring_buffer_expanded; |
513 | extern bool tracing_selftest_disabled; | |
5e5bf483 | 514 | DECLARE_PER_CPU(local_t, ftrace_cpu_disabled); |
020e5f85 | 515 | |
60a11774 | 516 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
517 | extern int trace_selftest_startup_function(struct tracer *trace, |
518 | struct trace_array *tr); | |
7447dce9 FW |
519 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
520 | struct trace_array *tr); | |
60a11774 SR |
521 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
522 | struct trace_array *tr); | |
60a11774 SR |
523 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
524 | struct trace_array *tr); | |
60a11774 SR |
525 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
526 | struct trace_array *tr); | |
60a11774 SR |
527 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
528 | struct trace_array *tr); | |
fb1b6d8b SN |
529 | extern int trace_selftest_startup_nop(struct tracer *trace, |
530 | struct trace_array *tr); | |
60a11774 SR |
531 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
532 | struct trace_array *tr); | |
a6dd24f8 IM |
533 | extern int trace_selftest_startup_sysprof(struct tracer *trace, |
534 | struct trace_array *tr); | |
80e5ea45 SR |
535 | extern int trace_selftest_startup_branch(struct tracer *trace, |
536 | struct trace_array *tr); | |
321bb5e1 MM |
537 | extern int trace_selftest_startup_hw_branches(struct tracer *trace, |
538 | struct trace_array *tr); | |
60a11774 SR |
539 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
540 | ||
c7aafc54 | 541 | extern void *head_page(struct trace_array_cpu *data); |
cf8e3474 | 542 | extern unsigned long long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 543 | extern int |
40ce74f1 | 544 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 545 | extern int |
40ce74f1 | 546 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
659372d3 SR |
547 | extern int |
548 | trace_array_vprintk(struct trace_array *tr, | |
549 | unsigned long ip, const char *fmt, va_list args); | |
550 | int trace_array_printk(struct trace_array *tr, | |
551 | unsigned long ip, const char *fmt, ...); | |
c7aafc54 | 552 | |
4e655519 IM |
553 | extern unsigned long trace_flags; |
554 | ||
5079f326 Z |
555 | extern int trace_clock_id; |
556 | ||
15e6cb36 | 557 | /* Standard output formatting function used for function return traces */ |
fb52607a FW |
558 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
559 | extern enum print_line_t print_graph_function(struct trace_iterator *iter); | |
0706f1c4 SR |
560 | extern enum print_line_t |
561 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); | |
ea4e2bc4 SR |
562 | |
563 | #ifdef CONFIG_DYNAMIC_FTRACE | |
564 | /* TODO: make this variable */ | |
565 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
566 | extern int ftrace_graph_count; | |
567 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
568 | ||
569 | static inline int ftrace_graph_addr(unsigned long addr) | |
570 | { | |
571 | int i; | |
572 | ||
573 | if (!ftrace_graph_count || test_tsk_trace_graph(current)) | |
574 | return 1; | |
575 | ||
576 | for (i = 0; i < ftrace_graph_count; i++) { | |
577 | if (addr == ftrace_graph_funcs[i]) | |
578 | return 1; | |
579 | } | |
580 | ||
581 | return 0; | |
582 | } | |
15e6cb36 | 583 | #else |
ea4e2bc4 SR |
584 | static inline int ftrace_trace_addr(unsigned long addr) |
585 | { | |
6b253930 IM |
586 | return 1; |
587 | } | |
588 | static inline int ftrace_graph_addr(unsigned long addr) | |
589 | { | |
590 | return 1; | |
ea4e2bc4 SR |
591 | } |
592 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
ea4e2bc4 | 593 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 594 | static inline enum print_line_t |
fb52607a | 595 | print_graph_function(struct trace_iterator *iter) |
15e6cb36 FW |
596 | { |
597 | return TRACE_TYPE_UNHANDLED; | |
598 | } | |
ea4e2bc4 | 599 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 600 | |
978f3a45 | 601 | extern struct pid *ftrace_pid_trace; |
804a6851 | 602 | |
1155de47 | 603 | #ifdef CONFIG_FUNCTION_TRACER |
804a6851 SR |
604 | static inline int ftrace_trace_task(struct task_struct *task) |
605 | { | |
77d683f3 | 606 | if (!ftrace_pid_trace) |
804a6851 SR |
607 | return 1; |
608 | ||
609 | return test_tsk_trace_trace(task); | |
610 | } | |
1155de47 PM |
611 | #else |
612 | static inline int ftrace_trace_task(struct task_struct *task) | |
613 | { | |
614 | return 1; | |
615 | } | |
616 | #endif | |
804a6851 | 617 | |
4fcdae83 SR |
618 | /* |
619 | * trace_iterator_flags is an enumeration that defines bit | |
620 | * positions into trace_flags that controls the output. | |
621 | * | |
622 | * NOTE: These bits must match the trace_options array in | |
623 | * trace.c. | |
624 | */ | |
4e655519 IM |
625 | enum trace_iterator_flags { |
626 | TRACE_ITER_PRINT_PARENT = 0x01, | |
627 | TRACE_ITER_SYM_OFFSET = 0x02, | |
628 | TRACE_ITER_SYM_ADDR = 0x04, | |
629 | TRACE_ITER_VERBOSE = 0x08, | |
630 | TRACE_ITER_RAW = 0x10, | |
631 | TRACE_ITER_HEX = 0x20, | |
632 | TRACE_ITER_BIN = 0x40, | |
633 | TRACE_ITER_BLOCK = 0x80, | |
634 | TRACE_ITER_STACKTRACE = 0x100, | |
4ac3ba41 | 635 | TRACE_ITER_SCHED_TREE = 0x200, |
f09ce573 | 636 | TRACE_ITER_PRINTK = 0x400, |
b2a866f9 | 637 | TRACE_ITER_PREEMPTONLY = 0x800, |
9f029e83 | 638 | TRACE_ITER_BRANCH = 0x1000, |
12ef7d44 | 639 | TRACE_ITER_ANNOTATE = 0x2000, |
b54d3de9 | 640 | TRACE_ITER_USERSTACKTRACE = 0x4000, |
66896a85 | 641 | TRACE_ITER_SYM_USEROBJ = 0x8000, |
c4a8e8be | 642 | TRACE_ITER_PRINTK_MSGONLY = 0x10000, |
c032ef64 SR |
643 | TRACE_ITER_CONTEXT_INFO = 0x20000, /* Print pid/cpu/time */ |
644 | TRACE_ITER_LATENCY_FMT = 0x40000, | |
5079f326 Z |
645 | TRACE_ITER_SLEEP_TIME = 0x80000, |
646 | TRACE_ITER_GRAPH_TIME = 0x100000, | |
4e655519 IM |
647 | }; |
648 | ||
15e6cb36 FW |
649 | /* |
650 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
651 | * control the output of kernel symbols. | |
652 | */ | |
653 | #define TRACE_ITER_SYM_MASK \ | |
654 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
655 | ||
43a15386 FW |
656 | extern struct tracer nop_trace; |
657 | ||
8f0a056f SR |
658 | /** |
659 | * ftrace_preempt_disable - disable preemption scheduler safe | |
660 | * | |
661 | * When tracing can happen inside the scheduler, there exists | |
662 | * cases that the tracing might happen before the need_resched | |
663 | * flag is checked. If this happens and the tracer calls | |
664 | * preempt_enable (after a disable), a schedule might take place | |
665 | * causing an infinite recursion. | |
666 | * | |
57794a9d | 667 | * To prevent this, we read the need_resched flag before |
8f0a056f SR |
668 | * disabling preemption. When we want to enable preemption we |
669 | * check the flag, if it is set, then we call preempt_enable_no_resched. | |
670 | * Otherwise, we call preempt_enable. | |
671 | * | |
57794a9d | 672 | * The rational for doing the above is that if need_resched is set |
8f0a056f SR |
673 | * and we have yet to reschedule, we are either in an atomic location |
674 | * (where we do not need to check for scheduling) or we are inside | |
675 | * the scheduler and do not want to resched. | |
676 | */ | |
677 | static inline int ftrace_preempt_disable(void) | |
678 | { | |
679 | int resched; | |
680 | ||
681 | resched = need_resched(); | |
682 | preempt_disable_notrace(); | |
683 | ||
684 | return resched; | |
685 | } | |
686 | ||
687 | /** | |
688 | * ftrace_preempt_enable - enable preemption scheduler safe | |
689 | * @resched: the return value from ftrace_preempt_disable | |
690 | * | |
691 | * This is a scheduler safe way to enable preemption and not miss | |
692 | * any preemption checks. The disabled saved the state of preemption. | |
57794a9d | 693 | * If resched is set, then we are either inside an atomic or |
8f0a056f SR |
694 | * are inside the scheduler (we would have already scheduled |
695 | * otherwise). In this case, we do not want to call normal | |
696 | * preempt_enable, but preempt_enable_no_resched instead. | |
697 | */ | |
698 | static inline void ftrace_preempt_enable(int resched) | |
699 | { | |
700 | if (resched) | |
701 | preempt_enable_no_resched_notrace(); | |
702 | else | |
703 | preempt_enable_notrace(); | |
704 | } | |
705 | ||
2ed84eeb | 706 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
707 | extern int enable_branch_tracing(struct trace_array *tr); |
708 | extern void disable_branch_tracing(void); | |
709 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 710 | { |
9f029e83 SR |
711 | if (trace_flags & TRACE_ITER_BRANCH) |
712 | return enable_branch_tracing(tr); | |
52f232cb SR |
713 | return 0; |
714 | } | |
9f029e83 | 715 | static inline void trace_branch_disable(void) |
52f232cb SR |
716 | { |
717 | /* due to races, always disable */ | |
9f029e83 | 718 | disable_branch_tracing(); |
52f232cb SR |
719 | } |
720 | #else | |
9f029e83 | 721 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
722 | { |
723 | return 0; | |
724 | } | |
9f029e83 | 725 | static inline void trace_branch_disable(void) |
52f232cb SR |
726 | { |
727 | } | |
2ed84eeb | 728 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 729 | |
1852fcce SR |
730 | /* set ring buffers to default size if not already done so */ |
731 | int tracing_update_buffers(void); | |
732 | ||
fd994989 SR |
733 | /* trace event type bit fields, not numeric */ |
734 | enum { | |
735 | TRACE_EVENT_TYPE_PRINTF = 1, | |
736 | TRACE_EVENT_TYPE_RAW = 2, | |
737 | }; | |
738 | ||
cf027f64 TZ |
739 | struct ftrace_event_field { |
740 | struct list_head link; | |
741 | char *name; | |
742 | char *type; | |
aa38e9fc | 743 | int filter_type; |
cf027f64 TZ |
744 | int offset; |
745 | int size; | |
a118e4d1 | 746 | int is_signed; |
cf027f64 TZ |
747 | }; |
748 | ||
30e673b2 TZ |
749 | struct event_filter { |
750 | int n_preds; | |
751 | struct filter_pred **preds; | |
8b372562 | 752 | char *filter_string; |
1f9963cb | 753 | bool no_reset; |
30e673b2 TZ |
754 | }; |
755 | ||
cfb180f3 TZ |
756 | struct event_subsystem { |
757 | struct list_head list; | |
758 | const char *name; | |
759 | struct dentry *entry; | |
1f9963cb | 760 | struct event_filter *filter; |
dc82ec98 | 761 | int nr_events; |
cfb180f3 TZ |
762 | }; |
763 | ||
7ce7e424 TZ |
764 | struct filter_pred; |
765 | ||
8b372562 TZ |
766 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event, |
767 | int val1, int val2); | |
7ce7e424 TZ |
768 | |
769 | struct filter_pred { | |
770 | filter_pred_fn_t fn; | |
771 | u64 val; | |
0a19e53c | 772 | char str_val[MAX_FILTER_STR_VAL]; |
7ce7e424 TZ |
773 | int str_len; |
774 | char *field_name; | |
775 | int offset; | |
776 | int not; | |
8b372562 TZ |
777 | int op; |
778 | int pop_n; | |
7ce7e424 TZ |
779 | }; |
780 | ||
8b372562 | 781 | extern void print_event_filter(struct ftrace_event_call *call, |
4bda2d51 | 782 | struct trace_seq *s); |
8b372562 TZ |
783 | extern int apply_event_filter(struct ftrace_event_call *call, |
784 | char *filter_string); | |
785 | extern int apply_subsystem_event_filter(struct event_subsystem *system, | |
786 | char *filter_string); | |
787 | extern void print_subsystem_event_filter(struct event_subsystem *system, | |
ac1adc55 | 788 | struct trace_seq *s); |
aa38e9fc | 789 | extern int filter_assign_type(const char *type); |
7ce7e424 | 790 | |
eb02ce01 | 791 | static inline int |
e1112b4d | 792 | filter_check_discard(struct ftrace_event_call *call, void *rec, |
eb02ce01 | 793 | struct ring_buffer *buffer, |
e1112b4d TZ |
794 | struct ring_buffer_event *event) |
795 | { | |
30e673b2 | 796 | if (unlikely(call->filter_active) && !filter_match_preds(call, rec)) { |
eb02ce01 TZ |
797 | ring_buffer_discard_commit(buffer, event); |
798 | return 1; | |
799 | } | |
800 | ||
801 | return 0; | |
e1112b4d TZ |
802 | } |
803 | ||
8b372562 TZ |
804 | #define DEFINE_COMPARISON_PRED(type) \ |
805 | static int filter_pred_##type(struct filter_pred *pred, void *event, \ | |
806 | int val1, int val2) \ | |
807 | { \ | |
808 | type *addr = (type *)(event + pred->offset); \ | |
809 | type val = (type)pred->val; \ | |
810 | int match = 0; \ | |
811 | \ | |
812 | switch (pred->op) { \ | |
813 | case OP_LT: \ | |
814 | match = (*addr < val); \ | |
815 | break; \ | |
816 | case OP_LE: \ | |
817 | match = (*addr <= val); \ | |
818 | break; \ | |
819 | case OP_GT: \ | |
820 | match = (*addr > val); \ | |
821 | break; \ | |
822 | case OP_GE: \ | |
823 | match = (*addr >= val); \ | |
824 | break; \ | |
825 | default: \ | |
826 | break; \ | |
827 | } \ | |
828 | \ | |
829 | return match; \ | |
830 | } | |
831 | ||
832 | #define DEFINE_EQUALITY_PRED(size) \ | |
833 | static int filter_pred_##size(struct filter_pred *pred, void *event, \ | |
834 | int val1, int val2) \ | |
835 | { \ | |
836 | u##size *addr = (u##size *)(event + pred->offset); \ | |
837 | u##size val = (u##size)pred->val; \ | |
838 | int match; \ | |
839 | \ | |
840 | match = (val == *addr) ^ pred->not; \ | |
841 | \ | |
842 | return match; \ | |
843 | } | |
844 | ||
20c8928a | 845 | extern struct mutex event_mutex; |
a59fd602 | 846 | extern struct list_head ftrace_events; |
ac199db0 | 847 | |
e9fb2b6d SR |
848 | extern const char *__start___trace_bprintk_fmt[]; |
849 | extern const char *__stop___trace_bprintk_fmt[]; | |
850 | ||
e1112b4d TZ |
851 | #undef TRACE_EVENT_FORMAT |
852 | #define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \ | |
853 | extern struct ftrace_event_call event_##call; | |
e45f2e2b TZ |
854 | #undef TRACE_EVENT_FORMAT_NOFILTER |
855 | #define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, tpfmt) | |
e1112b4d TZ |
856 | #include "trace_event_types.h" |
857 | ||
bc0c38d1 | 858 | #endif /* _LINUX_KERNEL_TRACE_H */ |