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> |
4e5292ea | 10 | #include <linux/tracepoint.h> |
d13744cd | 11 | #include <linux/ftrace.h> |
3f5ec136 | 12 | #include <trace/boot.h> |
02af61bb | 13 | #include <linux/kmemtrace.h> |
24f1e32c | 14 | #include <linux/hw_breakpoint.h> |
bc0c38d1 | 15 | |
9504504c | 16 | #include <linux/trace_seq.h> |
97f20251 | 17 | #include <linux/ftrace_event.h> |
9504504c | 18 | |
72829bc3 TG |
19 | enum trace_type { |
20 | __TRACE_FIRST_TYPE = 0, | |
21 | ||
22 | TRACE_FN, | |
23 | TRACE_CTX, | |
24 | TRACE_WAKE, | |
25 | TRACE_STACK, | |
dd0e545f | 26 | TRACE_PRINT, |
48ead020 | 27 | TRACE_BPRINT, |
72829bc3 | 28 | TRACE_SPECIAL, |
bd8ac686 PP |
29 | TRACE_MMIO_RW, |
30 | TRACE_MMIO_MAP, | |
9f029e83 | 31 | TRACE_BRANCH, |
74239072 FW |
32 | TRACE_BOOT_CALL, |
33 | TRACE_BOOT_RET, | |
287b6e68 FW |
34 | TRACE_GRAPH_RET, |
35 | TRACE_GRAPH_ENT, | |
02b67518 | 36 | TRACE_USER_STACK, |
36994e58 FW |
37 | TRACE_KMEM_ALLOC, |
38 | TRACE_KMEM_FREE, | |
c71a8961 | 39 | TRACE_BLK, |
0722db01 | 40 | TRACE_KSYM, |
72829bc3 | 41 | |
f0868d1e | 42 | __TRACE_LAST_TYPE, |
72829bc3 TG |
43 | }; |
44 | ||
0a1c49db SR |
45 | enum kmemtrace_type_id { |
46 | KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */ | |
47 | KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */ | |
48 | KMEMTRACE_TYPE_PAGES, /* __get_free_pages() and friends. */ | |
287b6e68 FW |
49 | }; |
50 | ||
d13744cd | 51 | extern struct tracer boot_tracer; |
bc0c38d1 | 52 | |
0a1c49db SR |
53 | #undef __field |
54 | #define __field(type, item) type item; | |
86387f7e | 55 | |
d7315094 SR |
56 | #undef __field_struct |
57 | #define __field_struct(type, item) __field(type, item) | |
86387f7e | 58 | |
d7315094 SR |
59 | #undef __field_desc |
60 | #define __field_desc(type, container, item) | |
02b67518 | 61 | |
0a1c49db SR |
62 | #undef __array |
63 | #define __array(type, item, size) type item[size]; | |
1427cdf0 | 64 | |
d7315094 SR |
65 | #undef __array_desc |
66 | #define __array_desc(type, container, item, size) | |
777e208d | 67 | |
0a1c49db SR |
68 | #undef __dynamic_array |
69 | #define __dynamic_array(type, item) type item[]; | |
777e208d | 70 | |
0a1c49db SR |
71 | #undef F_STRUCT |
72 | #define F_STRUCT(args...) args | |
74239072 | 73 | |
0a1c49db SR |
74 | #undef FTRACE_ENTRY |
75 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ | |
76 | struct struct_name { \ | |
77 | struct trace_entry ent; \ | |
78 | tstruct \ | |
79 | } | |
777e208d | 80 | |
0a1c49db SR |
81 | #undef TP_ARGS |
82 | #define TP_ARGS(args...) args | |
52f232cb | 83 | |
0a1c49db SR |
84 | #undef FTRACE_ENTRY_DUP |
85 | #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) | |
1e9b51c2 | 86 | |
0a1c49db | 87 | #include "trace_entries.h" |
36994e58 | 88 | |
0a1c49db SR |
89 | /* |
90 | * syscalls are special, and need special handling, this is why | |
91 | * they are not included in trace_entries.h | |
92 | */ | |
bed1ffca FW |
93 | struct syscall_trace_enter { |
94 | struct trace_entry ent; | |
95 | int nr; | |
96 | unsigned long args[]; | |
97 | }; | |
98 | ||
99 | struct syscall_trace_exit { | |
100 | struct trace_entry ent; | |
101 | int nr; | |
99df5a6a | 102 | long ret; |
bed1ffca FW |
103 | }; |
104 | ||
413d37d1 MH |
105 | struct kprobe_trace_entry { |
106 | struct trace_entry ent; | |
107 | unsigned long ip; | |
108 | int nargs; | |
109 | unsigned long args[]; | |
110 | }; | |
111 | ||
112 | #define SIZEOF_KPROBE_TRACE_ENTRY(n) \ | |
113 | (offsetof(struct kprobe_trace_entry, args) + \ | |
114 | (sizeof(unsigned long) * (n))) | |
115 | ||
116 | struct kretprobe_trace_entry { | |
117 | struct trace_entry ent; | |
118 | unsigned long func; | |
119 | unsigned long ret_ip; | |
120 | int nargs; | |
121 | unsigned long args[]; | |
122 | }; | |
123 | ||
124 | #define SIZEOF_KRETPROBE_TRACE_ENTRY(n) \ | |
125 | (offsetof(struct kretprobe_trace_entry, args) + \ | |
126 | (sizeof(unsigned long) * (n))) | |
127 | ||
fc5e27ae PP |
128 | /* |
129 | * trace_flag_type is an enumeration that holds different | |
130 | * states when a trace occurs. These are: | |
9244489a | 131 | * IRQS_OFF - interrupts were disabled |
9de36825 | 132 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
bd9cfca9 | 133 | * NEED_RESCHED - reschedule is requested |
9244489a SR |
134 | * HARDIRQ - inside an interrupt handler |
135 | * SOFTIRQ - inside a softirq handler | |
fc5e27ae PP |
136 | */ |
137 | enum trace_flag_type { | |
138 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
139 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
140 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
141 | TRACE_FLAG_HARDIRQ = 0x08, | |
142 | TRACE_FLAG_SOFTIRQ = 0x10, | |
fc5e27ae PP |
143 | }; |
144 | ||
5bf9a1ee | 145 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 SR |
146 | |
147 | /* | |
148 | * The CPU trace array - it consists of thousands of trace entries | |
149 | * plus some other descriptor data: (for example which task started | |
150 | * the trace, etc.) | |
151 | */ | |
152 | struct trace_array_cpu { | |
bc0c38d1 | 153 | atomic_t disabled; |
2cadf913 | 154 | void *buffer_page; /* ring buffer spare */ |
4e3c3333 | 155 | |
bc0c38d1 SR |
156 | unsigned long saved_latency; |
157 | unsigned long critical_start; | |
158 | unsigned long critical_end; | |
159 | unsigned long critical_sequence; | |
160 | unsigned long nice; | |
161 | unsigned long policy; | |
162 | unsigned long rt_priority; | |
2f26ebd5 | 163 | unsigned long skipped_entries; |
bc0c38d1 SR |
164 | cycle_t preempt_timestamp; |
165 | pid_t pid; | |
166 | uid_t uid; | |
167 | char comm[TASK_COMM_LEN]; | |
168 | }; | |
169 | ||
bc0c38d1 SR |
170 | /* |
171 | * The trace array - an array of per-CPU trace arrays. This is the | |
172 | * highest level data structure that individual tracers deal with. | |
173 | * They have on/off state as well: | |
174 | */ | |
175 | struct trace_array { | |
3928a8a2 | 176 | struct ring_buffer *buffer; |
bc0c38d1 | 177 | unsigned long entries; |
bc0c38d1 SR |
178 | int cpu; |
179 | cycle_t time_start; | |
b3806b43 | 180 | struct task_struct *waiter; |
bc0c38d1 SR |
181 | struct trace_array_cpu *data[NR_CPUS]; |
182 | }; | |
183 | ||
7104f300 SR |
184 | #define FTRACE_CMP_TYPE(var, type) \ |
185 | __builtin_types_compatible_p(typeof(var), type *) | |
186 | ||
187 | #undef IF_ASSIGN | |
188 | #define IF_ASSIGN(var, entry, etype, id) \ | |
189 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
190 | var = (typeof(var))(entry); \ | |
191 | WARN_ON(id && (entry)->type != id); \ | |
192 | break; \ | |
193 | } | |
194 | ||
195 | /* Will cause compile errors if type is not found. */ | |
196 | extern void __ftrace_bad_type(void); | |
197 | ||
198 | /* | |
199 | * The trace_assign_type is a verifier that the entry type is | |
200 | * the same as the type being assigned. To add new types simply | |
201 | * add a line with the following format: | |
202 | * | |
203 | * IF_ASSIGN(var, ent, type, id); | |
204 | * | |
205 | * Where "type" is the trace type that includes the trace_entry | |
206 | * as the "ent" item. And "id" is the trace identifier that is | |
207 | * used in the trace_type enum. | |
208 | * | |
209 | * If the type can have more than one id, then use zero. | |
210 | */ | |
211 | #define trace_assign_type(var, ent) \ | |
212 | do { \ | |
213 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
214 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 215 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 216 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 217 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 218 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
7104f300 SR |
219 | IF_ASSIGN(var, ent, struct special_entry, 0); \ |
220 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ | |
221 | TRACE_MMIO_RW); \ | |
222 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
223 | TRACE_MMIO_MAP); \ | |
74239072 FW |
224 | IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\ |
225 | IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\ | |
9f029e83 | 226 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
227 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
228 | TRACE_GRAPH_ENT); \ | |
229 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
230 | TRACE_GRAPH_RET); \ | |
36994e58 FW |
231 | IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \ |
232 | TRACE_KMEM_ALLOC); \ | |
233 | IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \ | |
234 | TRACE_KMEM_FREE); \ | |
db59504d | 235 | IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\ |
7104f300 SR |
236 | __ftrace_bad_type(); \ |
237 | } while (0) | |
2c4f035f | 238 | |
adf9f195 FW |
239 | /* |
240 | * An option specific to a tracer. This is a boolean value. | |
241 | * The bit is the bit index that sets its value on the | |
242 | * flags value in struct tracer_flags. | |
243 | */ | |
244 | struct tracer_opt { | |
9de36825 IM |
245 | const char *name; /* Will appear on the trace_options file */ |
246 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
247 | }; |
248 | ||
249 | /* | |
250 | * The set of specific options for a tracer. Your tracer | |
251 | * have to set the initial value of the flags val. | |
252 | */ | |
253 | struct tracer_flags { | |
254 | u32 val; | |
9de36825 | 255 | struct tracer_opt *opts; |
adf9f195 FW |
256 | }; |
257 | ||
258 | /* Makes more easy to define a tracer opt */ | |
259 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
260 | ||
034939b6 | 261 | |
6eaaa5d5 FW |
262 | /** |
263 | * struct tracer - a specific tracer and its callbacks to interact with debugfs | |
264 | * @name: the name chosen to select it on the available_tracers file | |
265 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
266 | * @reset: called when one switches to another tracer | |
267 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled) | |
268 | * @stop: called when tracing is paused (echo 0 > tracing_enabled) | |
269 | * @open: called when the trace file is opened | |
270 | * @pipe_open: called when the trace_pipe file is opened | |
271 | * @wait_pipe: override how the user waits for traces on trace_pipe | |
272 | * @close: called when the trace file is released | |
c521efd1 | 273 | * @pipe_close: called when the trace_pipe file is released |
6eaaa5d5 FW |
274 | * @read: override the default read callback on trace_pipe |
275 | * @splice_read: override the default splice_read callback on trace_pipe | |
276 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
277 | * @print_headers: override the first lines that describe your columns | |
278 | * @print_line: callback that prints a trace | |
279 | * @set_flag: signals one of your private flags changed (trace_options file) | |
280 | * @flags: your private flags | |
bc0c38d1 SR |
281 | */ |
282 | struct tracer { | |
283 | const char *name; | |
1c80025a | 284 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 285 | void (*reset)(struct trace_array *tr); |
9036990d SR |
286 | void (*start)(struct trace_array *tr); |
287 | void (*stop)(struct trace_array *tr); | |
bc0c38d1 | 288 | void (*open)(struct trace_iterator *iter); |
107bad8b | 289 | void (*pipe_open)(struct trace_iterator *iter); |
6eaaa5d5 | 290 | void (*wait_pipe)(struct trace_iterator *iter); |
bc0c38d1 | 291 | void (*close)(struct trace_iterator *iter); |
c521efd1 | 292 | void (*pipe_close)(struct trace_iterator *iter); |
107bad8b SR |
293 | ssize_t (*read)(struct trace_iterator *iter, |
294 | struct file *filp, char __user *ubuf, | |
295 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
296 | ssize_t (*splice_read)(struct trace_iterator *iter, |
297 | struct file *filp, | |
298 | loff_t *ppos, | |
299 | struct pipe_inode_info *pipe, | |
300 | size_t len, | |
301 | unsigned int flags); | |
60a11774 SR |
302 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
303 | int (*selftest)(struct tracer *trace, | |
304 | struct trace_array *tr); | |
305 | #endif | |
8bba1bf5 | 306 | void (*print_header)(struct seq_file *m); |
2c4f035f | 307 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 FW |
308 | /* If you handled the flag setting, return 0 */ |
309 | int (*set_flag)(u32 old_flags, u32 bit, int set); | |
bc0c38d1 SR |
310 | struct tracer *next; |
311 | int print_max; | |
9de36825 | 312 | struct tracer_flags *flags; |
bc0c38d1 SR |
313 | }; |
314 | ||
f9520750 | 315 | |
b04cc6b1 FW |
316 | #define TRACE_PIPE_ALL_CPU -1 |
317 | ||
b6f11df2 | 318 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 319 | int tracing_is_enabled(void); |
45dcd8b8 | 320 | void trace_wake_up(void); |
3928a8a2 | 321 | void tracing_reset(struct trace_array *tr, int cpu); |
213cc060 | 322 | void tracing_reset_online_cpus(struct trace_array *tr); |
9456f0fa SR |
323 | void tracing_reset_current(int cpu); |
324 | void tracing_reset_current_online_cpus(void); | |
bc0c38d1 | 325 | int tracing_open_generic(struct inode *inode, struct file *filp); |
5452af66 FW |
326 | struct dentry *trace_create_file(const char *name, |
327 | mode_t mode, | |
328 | struct dentry *parent, | |
329 | void *data, | |
330 | const struct file_operations *fops); | |
331 | ||
bc0c38d1 | 332 | struct dentry *tracing_init_dentry(void); |
d618b3e6 IM |
333 | void init_tracer_sysprof_debugfs(struct dentry *d_tracer); |
334 | ||
51a763dd ACM |
335 | struct ring_buffer_event; |
336 | ||
e77405ad SR |
337 | struct ring_buffer_event * |
338 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
339 | int type, | |
340 | unsigned long len, | |
341 | unsigned long flags, | |
342 | int pc); | |
343 | void trace_buffer_unlock_commit(struct ring_buffer *buffer, | |
51a763dd ACM |
344 | struct ring_buffer_event *event, |
345 | unsigned long flags, int pc); | |
346 | ||
45dcd8b8 PP |
347 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
348 | struct trace_array_cpu *data); | |
c4a8e8be FW |
349 | |
350 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
351 | int *ent_cpu, u64 *ent_ts); | |
352 | ||
6eaaa5d5 FW |
353 | void default_wait_pipe(struct trace_iterator *iter); |
354 | void poll_wait_pipe(struct trace_iterator *iter); | |
355 | ||
bc0c38d1 SR |
356 | void ftrace(struct trace_array *tr, |
357 | struct trace_array_cpu *data, | |
358 | unsigned long ip, | |
359 | unsigned long parent_ip, | |
38697053 | 360 | unsigned long flags, int pc); |
bc0c38d1 | 361 | void tracing_sched_switch_trace(struct trace_array *tr, |
bc0c38d1 SR |
362 | struct task_struct *prev, |
363 | struct task_struct *next, | |
38697053 | 364 | unsigned long flags, int pc); |
57422797 IM |
365 | |
366 | void tracing_sched_wakeup_trace(struct trace_array *tr, | |
57422797 IM |
367 | struct task_struct *wakee, |
368 | struct task_struct *cur, | |
38697053 | 369 | unsigned long flags, int pc); |
f0a920d5 IM |
370 | void trace_special(struct trace_array *tr, |
371 | struct trace_array_cpu *data, | |
372 | unsigned long arg1, | |
373 | unsigned long arg2, | |
38697053 | 374 | unsigned long arg3, int pc); |
6fb44b71 | 375 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
376 | unsigned long ip, |
377 | unsigned long parent_ip, | |
38697053 | 378 | unsigned long flags, int pc); |
bc0c38d1 | 379 | |
287b6e68 | 380 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 381 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1a0799a8 | 382 | void set_graph_array(struct trace_array *tr); |
1e9b51c2 | 383 | |
41bc8144 SR |
384 | void tracing_start_cmdline_record(void); |
385 | void tracing_stop_cmdline_record(void); | |
e168e051 SR |
386 | void tracing_sched_switch_assign_trace(struct trace_array *tr); |
387 | void tracing_stop_sched_switch_record(void); | |
388 | void tracing_start_sched_switch_record(void); | |
bc0c38d1 SR |
389 | int register_tracer(struct tracer *type); |
390 | void unregister_tracer(struct tracer *type); | |
b5130b1e | 391 | int is_tracing_stopped(void); |
bc0c38d1 | 392 | |
0f8f86c7 | 393 | extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr); |
bc0c38d1 SR |
394 | |
395 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
396 | ||
0e950173 TB |
397 | extern unsigned long tracing_thresh; |
398 | ||
5d4a9dba | 399 | #ifdef CONFIG_TRACER_MAX_TRACE |
bc0c38d1 | 400 | extern unsigned long tracing_max_latency; |
bc0c38d1 SR |
401 | |
402 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); | |
403 | void update_max_tr_single(struct trace_array *tr, | |
404 | struct task_struct *tsk, int cpu); | |
5d4a9dba | 405 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 406 | |
c0a0d0d3 | 407 | #ifdef CONFIG_STACKTRACE |
e77405ad | 408 | void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
409 | int skip, int pc); |
410 | ||
e77405ad | 411 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
412 | int pc); |
413 | ||
414 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, | |
415 | int pc); | |
416 | #else | |
417 | static inline void ftrace_trace_stack(struct trace_array *tr, | |
418 | unsigned long flags, int skip, int pc) | |
419 | { | |
420 | } | |
421 | ||
422 | static inline void ftrace_trace_userstack(struct trace_array *tr, | |
423 | unsigned long flags, int pc) | |
424 | { | |
425 | } | |
426 | ||
427 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags, | |
428 | int skip, int pc) | |
429 | { | |
430 | } | |
431 | #endif /* CONFIG_STACKTRACE */ | |
53614991 | 432 | |
e309b41d | 433 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 434 | |
4ca53085 | 435 | extern void trace_find_cmdline(int pid, char comm[]); |
f7d48cbd | 436 | |
bc0c38d1 SR |
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 | ||
020e5f85 LZ |
443 | extern int ring_buffer_expanded; |
444 | extern bool tracing_selftest_disabled; | |
9288f99a | 445 | DECLARE_PER_CPU(int, ftrace_cpu_disabled); |
020e5f85 | 446 | |
60a11774 | 447 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
448 | extern int trace_selftest_startup_function(struct tracer *trace, |
449 | struct trace_array *tr); | |
7447dce9 FW |
450 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
451 | struct trace_array *tr); | |
60a11774 SR |
452 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
453 | struct trace_array *tr); | |
60a11774 SR |
454 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
455 | struct trace_array *tr); | |
60a11774 SR |
456 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
457 | struct trace_array *tr); | |
60a11774 SR |
458 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
459 | struct trace_array *tr); | |
fb1b6d8b SN |
460 | extern int trace_selftest_startup_nop(struct tracer *trace, |
461 | struct trace_array *tr); | |
60a11774 SR |
462 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
463 | struct trace_array *tr); | |
a6dd24f8 IM |
464 | extern int trace_selftest_startup_sysprof(struct tracer *trace, |
465 | struct trace_array *tr); | |
80e5ea45 SR |
466 | extern int trace_selftest_startup_branch(struct tracer *trace, |
467 | struct trace_array *tr); | |
0722db01 P |
468 | extern int trace_selftest_startup_ksym(struct tracer *trace, |
469 | struct trace_array *tr); | |
60a11774 SR |
470 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
471 | ||
c7aafc54 | 472 | extern void *head_page(struct trace_array_cpu *data); |
cf8e3474 | 473 | extern unsigned long long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 474 | extern int |
40ce74f1 | 475 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 476 | extern int |
40ce74f1 | 477 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
659372d3 SR |
478 | extern int |
479 | trace_array_vprintk(struct trace_array *tr, | |
480 | unsigned long ip, const char *fmt, va_list args); | |
481 | int trace_array_printk(struct trace_array *tr, | |
482 | unsigned long ip, const char *fmt, ...); | |
c7aafc54 | 483 | |
4e655519 IM |
484 | extern unsigned long trace_flags; |
485 | ||
5079f326 Z |
486 | extern int trace_clock_id; |
487 | ||
15e6cb36 | 488 | /* Standard output formatting function used for function return traces */ |
fb52607a FW |
489 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
490 | extern enum print_line_t print_graph_function(struct trace_iterator *iter); | |
0706f1c4 SR |
491 | extern enum print_line_t |
492 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); | |
ea4e2bc4 SR |
493 | |
494 | #ifdef CONFIG_DYNAMIC_FTRACE | |
495 | /* TODO: make this variable */ | |
496 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
c7c6b1fe | 497 | extern int ftrace_graph_filter_enabled; |
ea4e2bc4 SR |
498 | extern int ftrace_graph_count; |
499 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
500 | ||
501 | static inline int ftrace_graph_addr(unsigned long addr) | |
502 | { | |
503 | int i; | |
504 | ||
c7c6b1fe | 505 | if (!ftrace_graph_filter_enabled) |
ea4e2bc4 SR |
506 | return 1; |
507 | ||
508 | for (i = 0; i < ftrace_graph_count; i++) { | |
509 | if (addr == ftrace_graph_funcs[i]) | |
510 | return 1; | |
511 | } | |
512 | ||
513 | return 0; | |
514 | } | |
15e6cb36 | 515 | #else |
6b253930 IM |
516 | static inline int ftrace_graph_addr(unsigned long addr) |
517 | { | |
518 | return 1; | |
ea4e2bc4 SR |
519 | } |
520 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
ea4e2bc4 | 521 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 522 | static inline enum print_line_t |
fb52607a | 523 | print_graph_function(struct trace_iterator *iter) |
15e6cb36 FW |
524 | { |
525 | return TRACE_TYPE_UNHANDLED; | |
526 | } | |
ea4e2bc4 | 527 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 528 | |
756d17ee | 529 | extern struct list_head ftrace_pids; |
804a6851 | 530 | |
1155de47 | 531 | #ifdef CONFIG_FUNCTION_TRACER |
804a6851 SR |
532 | static inline int ftrace_trace_task(struct task_struct *task) |
533 | { | |
756d17ee | 534 | if (list_empty(&ftrace_pids)) |
804a6851 SR |
535 | return 1; |
536 | ||
537 | return test_tsk_trace_trace(task); | |
538 | } | |
1155de47 PM |
539 | #else |
540 | static inline int ftrace_trace_task(struct task_struct *task) | |
541 | { | |
542 | return 1; | |
543 | } | |
544 | #endif | |
804a6851 | 545 | |
b63f39ea | 546 | /* |
547 | * struct trace_parser - servers for reading the user input separated by spaces | |
548 | * @cont: set if the input is not complete - no final space char was found | |
549 | * @buffer: holds the parsed user input | |
1537a363 | 550 | * @idx: user input length |
b63f39ea | 551 | * @size: buffer size |
552 | */ | |
553 | struct trace_parser { | |
554 | bool cont; | |
555 | char *buffer; | |
556 | unsigned idx; | |
557 | unsigned size; | |
558 | }; | |
559 | ||
560 | static inline bool trace_parser_loaded(struct trace_parser *parser) | |
561 | { | |
562 | return (parser->idx != 0); | |
563 | } | |
564 | ||
565 | static inline bool trace_parser_cont(struct trace_parser *parser) | |
566 | { | |
567 | return parser->cont; | |
568 | } | |
569 | ||
570 | static inline void trace_parser_clear(struct trace_parser *parser) | |
571 | { | |
572 | parser->cont = false; | |
573 | parser->idx = 0; | |
574 | } | |
575 | ||
576 | extern int trace_parser_get_init(struct trace_parser *parser, int size); | |
577 | extern void trace_parser_put(struct trace_parser *parser); | |
578 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
579 | size_t cnt, loff_t *ppos); | |
580 | ||
4fcdae83 SR |
581 | /* |
582 | * trace_iterator_flags is an enumeration that defines bit | |
583 | * positions into trace_flags that controls the output. | |
584 | * | |
585 | * NOTE: These bits must match the trace_options array in | |
586 | * trace.c. | |
587 | */ | |
4e655519 IM |
588 | enum trace_iterator_flags { |
589 | TRACE_ITER_PRINT_PARENT = 0x01, | |
590 | TRACE_ITER_SYM_OFFSET = 0x02, | |
591 | TRACE_ITER_SYM_ADDR = 0x04, | |
592 | TRACE_ITER_VERBOSE = 0x08, | |
593 | TRACE_ITER_RAW = 0x10, | |
594 | TRACE_ITER_HEX = 0x20, | |
595 | TRACE_ITER_BIN = 0x40, | |
596 | TRACE_ITER_BLOCK = 0x80, | |
597 | TRACE_ITER_STACKTRACE = 0x100, | |
2cbafd68 LZ |
598 | TRACE_ITER_PRINTK = 0x200, |
599 | TRACE_ITER_PREEMPTONLY = 0x400, | |
600 | TRACE_ITER_BRANCH = 0x800, | |
601 | TRACE_ITER_ANNOTATE = 0x1000, | |
602 | TRACE_ITER_USERSTACKTRACE = 0x2000, | |
603 | TRACE_ITER_SYM_USEROBJ = 0x4000, | |
604 | TRACE_ITER_PRINTK_MSGONLY = 0x8000, | |
605 | TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ | |
606 | TRACE_ITER_LATENCY_FMT = 0x20000, | |
607 | TRACE_ITER_SLEEP_TIME = 0x40000, | |
608 | TRACE_ITER_GRAPH_TIME = 0x80000, | |
4e655519 IM |
609 | }; |
610 | ||
15e6cb36 FW |
611 | /* |
612 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
613 | * control the output of kernel symbols. | |
614 | */ | |
615 | #define TRACE_ITER_SYM_MASK \ | |
616 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
617 | ||
43a15386 FW |
618 | extern struct tracer nop_trace; |
619 | ||
8f0a056f SR |
620 | /** |
621 | * ftrace_preempt_disable - disable preemption scheduler safe | |
622 | * | |
623 | * When tracing can happen inside the scheduler, there exists | |
624 | * cases that the tracing might happen before the need_resched | |
625 | * flag is checked. If this happens and the tracer calls | |
626 | * preempt_enable (after a disable), a schedule might take place | |
627 | * causing an infinite recursion. | |
628 | * | |
57794a9d | 629 | * To prevent this, we read the need_resched flag before |
8f0a056f SR |
630 | * disabling preemption. When we want to enable preemption we |
631 | * check the flag, if it is set, then we call preempt_enable_no_resched. | |
632 | * Otherwise, we call preempt_enable. | |
633 | * | |
57794a9d | 634 | * The rational for doing the above is that if need_resched is set |
8f0a056f SR |
635 | * and we have yet to reschedule, we are either in an atomic location |
636 | * (where we do not need to check for scheduling) or we are inside | |
637 | * the scheduler and do not want to resched. | |
638 | */ | |
639 | static inline int ftrace_preempt_disable(void) | |
640 | { | |
641 | int resched; | |
642 | ||
643 | resched = need_resched(); | |
644 | preempt_disable_notrace(); | |
645 | ||
646 | return resched; | |
647 | } | |
648 | ||
649 | /** | |
650 | * ftrace_preempt_enable - enable preemption scheduler safe | |
651 | * @resched: the return value from ftrace_preempt_disable | |
652 | * | |
653 | * This is a scheduler safe way to enable preemption and not miss | |
654 | * any preemption checks. The disabled saved the state of preemption. | |
57794a9d | 655 | * If resched is set, then we are either inside an atomic or |
8f0a056f SR |
656 | * are inside the scheduler (we would have already scheduled |
657 | * otherwise). In this case, we do not want to call normal | |
658 | * preempt_enable, but preempt_enable_no_resched instead. | |
659 | */ | |
660 | static inline void ftrace_preempt_enable(int resched) | |
661 | { | |
662 | if (resched) | |
663 | preempt_enable_no_resched_notrace(); | |
664 | else | |
665 | preempt_enable_notrace(); | |
666 | } | |
667 | ||
2ed84eeb | 668 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
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) | |
52f232cb | 672 | { |
9f029e83 SR |
673 | if (trace_flags & TRACE_ITER_BRANCH) |
674 | return enable_branch_tracing(tr); | |
52f232cb SR |
675 | return 0; |
676 | } | |
9f029e83 | 677 | static inline void trace_branch_disable(void) |
52f232cb SR |
678 | { |
679 | /* due to races, always disable */ | |
9f029e83 | 680 | disable_branch_tracing(); |
52f232cb SR |
681 | } |
682 | #else | |
9f029e83 | 683 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
684 | { |
685 | return 0; | |
686 | } | |
9f029e83 | 687 | static inline void trace_branch_disable(void) |
52f232cb SR |
688 | { |
689 | } | |
2ed84eeb | 690 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 691 | |
1852fcce SR |
692 | /* set ring buffers to default size if not already done so */ |
693 | int tracing_update_buffers(void); | |
694 | ||
fd994989 SR |
695 | /* trace event type bit fields, not numeric */ |
696 | enum { | |
697 | TRACE_EVENT_TYPE_PRINTF = 1, | |
698 | TRACE_EVENT_TYPE_RAW = 2, | |
699 | }; | |
700 | ||
cf027f64 TZ |
701 | struct ftrace_event_field { |
702 | struct list_head link; | |
703 | char *name; | |
704 | char *type; | |
aa38e9fc | 705 | int filter_type; |
cf027f64 TZ |
706 | int offset; |
707 | int size; | |
a118e4d1 | 708 | int is_signed; |
cf027f64 TZ |
709 | }; |
710 | ||
30e673b2 TZ |
711 | struct event_filter { |
712 | int n_preds; | |
713 | struct filter_pred **preds; | |
8b372562 | 714 | char *filter_string; |
30e673b2 TZ |
715 | }; |
716 | ||
cfb180f3 TZ |
717 | struct event_subsystem { |
718 | struct list_head list; | |
719 | const char *name; | |
720 | struct dentry *entry; | |
1f9963cb | 721 | struct event_filter *filter; |
dc82ec98 | 722 | int nr_events; |
cfb180f3 TZ |
723 | }; |
724 | ||
7ce7e424 | 725 | struct filter_pred; |
1889d209 | 726 | struct regex; |
7ce7e424 | 727 | |
8b372562 TZ |
728 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event, |
729 | int val1, int val2); | |
7ce7e424 | 730 | |
1889d209 FW |
731 | typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
732 | ||
3f6fe06d | 733 | enum regex_type { |
b0f1a59a | 734 | MATCH_FULL = 0, |
3f6fe06d FW |
735 | MATCH_FRONT_ONLY, |
736 | MATCH_MIDDLE_ONLY, | |
737 | MATCH_END_ONLY, | |
738 | }; | |
739 | ||
1889d209 FW |
740 | struct regex { |
741 | char pattern[MAX_FILTER_STR_VAL]; | |
742 | int len; | |
743 | int field_len; | |
744 | regex_match_func match; | |
745 | }; | |
746 | ||
7ce7e424 | 747 | struct filter_pred { |
1889d209 FW |
748 | filter_pred_fn_t fn; |
749 | u64 val; | |
750 | struct regex regex; | |
751 | char *field_name; | |
752 | int offset; | |
753 | int not; | |
754 | int op; | |
755 | int pop_n; | |
7ce7e424 TZ |
756 | }; |
757 | ||
3f6fe06d FW |
758 | extern enum regex_type |
759 | filter_parse_regex(char *buff, int len, char **search, int *not); | |
8b372562 | 760 | extern void print_event_filter(struct ftrace_event_call *call, |
4bda2d51 | 761 | struct trace_seq *s); |
8b372562 TZ |
762 | extern int apply_event_filter(struct ftrace_event_call *call, |
763 | char *filter_string); | |
764 | extern int apply_subsystem_event_filter(struct event_subsystem *system, | |
765 | char *filter_string); | |
766 | extern void print_subsystem_event_filter(struct event_subsystem *system, | |
ac1adc55 | 767 | struct trace_seq *s); |
aa38e9fc | 768 | extern int filter_assign_type(const char *type); |
7ce7e424 | 769 | |
eb02ce01 | 770 | static inline int |
e1112b4d | 771 | filter_check_discard(struct ftrace_event_call *call, void *rec, |
eb02ce01 | 772 | struct ring_buffer *buffer, |
e1112b4d TZ |
773 | struct ring_buffer_event *event) |
774 | { | |
6fb2915d LZ |
775 | if (unlikely(call->filter_active) && |
776 | !filter_match_preds(call->filter, rec)) { | |
eb02ce01 TZ |
777 | ring_buffer_discard_commit(buffer, event); |
778 | return 1; | |
779 | } | |
780 | ||
781 | return 0; | |
e1112b4d TZ |
782 | } |
783 | ||
20c8928a | 784 | extern struct mutex event_mutex; |
a59fd602 | 785 | extern struct list_head ftrace_events; |
ac199db0 | 786 | |
e9fb2b6d SR |
787 | extern const char *__start___trace_bprintk_fmt[]; |
788 | extern const char *__stop___trace_bprintk_fmt[]; | |
789 | ||
4e5292ea SR |
790 | #undef FTRACE_ENTRY |
791 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ | |
86c38a31 JM |
792 | extern struct ftrace_event_call \ |
793 | __attribute__((__aligned__(4))) event_##call; | |
4e5292ea SR |
794 | #undef FTRACE_ENTRY_DUP |
795 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ | |
796 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) | |
797 | #include "trace_entries.h" | |
e1112b4d | 798 | |
bc0c38d1 | 799 | #endif /* _LINUX_KERNEL_TRACE_H */ |