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Commit | Line | Data |
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bac5fb97 | 1 | |
bc0c38d1 SR |
2 | #ifndef _LINUX_KERNEL_TRACE_H |
3 | #define _LINUX_KERNEL_TRACE_H | |
4 | ||
5 | #include <linux/fs.h> | |
60063497 | 6 | #include <linux/atomic.h> |
bc0c38d1 SR |
7 | #include <linux/sched.h> |
8 | #include <linux/clocksource.h> | |
3928a8a2 | 9 | #include <linux/ring_buffer.h> |
bd8ac686 | 10 | #include <linux/mmiotrace.h> |
4e5292ea | 11 | #include <linux/tracepoint.h> |
d13744cd | 12 | #include <linux/ftrace.h> |
24f1e32c | 13 | #include <linux/hw_breakpoint.h> |
9504504c | 14 | #include <linux/trace_seq.h> |
af658dca | 15 | #include <linux/trace_events.h> |
52f5684c | 16 | #include <linux/compiler.h> |
19a7fe20 | 17 | #include <linux/trace_seq.h> |
9504504c | 18 | |
12ab74ee SR |
19 | #ifdef CONFIG_FTRACE_SYSCALLS |
20 | #include <asm/unistd.h> /* For NR_SYSCALLS */ | |
21 | #include <asm/syscall.h> /* some archs define it here */ | |
22 | #endif | |
23 | ||
72829bc3 TG |
24 | enum trace_type { |
25 | __TRACE_FIRST_TYPE = 0, | |
26 | ||
27 | TRACE_FN, | |
28 | TRACE_CTX, | |
29 | TRACE_WAKE, | |
30 | TRACE_STACK, | |
dd0e545f | 31 | TRACE_PRINT, |
48ead020 | 32 | TRACE_BPRINT, |
bd8ac686 PP |
33 | TRACE_MMIO_RW, |
34 | TRACE_MMIO_MAP, | |
9f029e83 | 35 | TRACE_BRANCH, |
287b6e68 FW |
36 | TRACE_GRAPH_RET, |
37 | TRACE_GRAPH_ENT, | |
02b67518 | 38 | TRACE_USER_STACK, |
c71a8961 | 39 | TRACE_BLK, |
09ae7234 | 40 | TRACE_BPUTS, |
72829bc3 | 41 | |
f0868d1e | 42 | __TRACE_LAST_TYPE, |
72829bc3 TG |
43 | }; |
44 | ||
bc0c38d1 | 45 | |
0a1c49db SR |
46 | #undef __field |
47 | #define __field(type, item) type item; | |
86387f7e | 48 | |
d7315094 SR |
49 | #undef __field_struct |
50 | #define __field_struct(type, item) __field(type, item) | |
86387f7e | 51 | |
d7315094 SR |
52 | #undef __field_desc |
53 | #define __field_desc(type, container, item) | |
02b67518 | 54 | |
0a1c49db SR |
55 | #undef __array |
56 | #define __array(type, item, size) type item[size]; | |
1427cdf0 | 57 | |
d7315094 SR |
58 | #undef __array_desc |
59 | #define __array_desc(type, container, item, size) | |
777e208d | 60 | |
0a1c49db SR |
61 | #undef __dynamic_array |
62 | #define __dynamic_array(type, item) type item[]; | |
777e208d | 63 | |
0a1c49db SR |
64 | #undef F_STRUCT |
65 | #define F_STRUCT(args...) args | |
74239072 | 66 | |
0a1c49db | 67 | #undef FTRACE_ENTRY |
02aa3162 JO |
68 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
69 | struct struct_name { \ | |
70 | struct trace_entry ent; \ | |
71 | tstruct \ | |
0a1c49db | 72 | } |
777e208d | 73 | |
0a1c49db | 74 | #undef FTRACE_ENTRY_DUP |
02aa3162 | 75 | #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) |
1e9b51c2 | 76 | |
e59a0bff | 77 | #undef FTRACE_ENTRY_REG |
02aa3162 JO |
78 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ |
79 | filter, regfn) \ | |
80 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
81 | filter) | |
e59a0bff | 82 | |
0a1c49db | 83 | #include "trace_entries.h" |
36994e58 | 84 | |
0a1c49db SR |
85 | /* |
86 | * syscalls are special, and need special handling, this is why | |
87 | * they are not included in trace_entries.h | |
88 | */ | |
bed1ffca FW |
89 | struct syscall_trace_enter { |
90 | struct trace_entry ent; | |
91 | int nr; | |
92 | unsigned long args[]; | |
93 | }; | |
94 | ||
95 | struct syscall_trace_exit { | |
96 | struct trace_entry ent; | |
97 | int nr; | |
99df5a6a | 98 | long ret; |
bed1ffca FW |
99 | }; |
100 | ||
93ccae7a | 101 | struct kprobe_trace_entry_head { |
413d37d1 MH |
102 | struct trace_entry ent; |
103 | unsigned long ip; | |
413d37d1 MH |
104 | }; |
105 | ||
93ccae7a | 106 | struct kretprobe_trace_entry_head { |
413d37d1 MH |
107 | struct trace_entry ent; |
108 | unsigned long func; | |
109 | unsigned long ret_ip; | |
413d37d1 MH |
110 | }; |
111 | ||
fc5e27ae PP |
112 | /* |
113 | * trace_flag_type is an enumeration that holds different | |
114 | * states when a trace occurs. These are: | |
9244489a | 115 | * IRQS_OFF - interrupts were disabled |
9de36825 | 116 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
bd9cfca9 | 117 | * NEED_RESCHED - reschedule is requested |
9244489a SR |
118 | * HARDIRQ - inside an interrupt handler |
119 | * SOFTIRQ - inside a softirq handler | |
fc5e27ae PP |
120 | */ |
121 | enum trace_flag_type { | |
122 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
123 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
124 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
125 | TRACE_FLAG_HARDIRQ = 0x08, | |
126 | TRACE_FLAG_SOFTIRQ = 0x10, | |
e5137b50 | 127 | TRACE_FLAG_PREEMPT_RESCHED = 0x20, |
fc5e27ae PP |
128 | }; |
129 | ||
5bf9a1ee | 130 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 | 131 | |
2b6080f2 SR |
132 | struct trace_array; |
133 | ||
bc0c38d1 SR |
134 | /* |
135 | * The CPU trace array - it consists of thousands of trace entries | |
136 | * plus some other descriptor data: (for example which task started | |
137 | * the trace, etc.) | |
138 | */ | |
139 | struct trace_array_cpu { | |
bc0c38d1 | 140 | atomic_t disabled; |
2cadf913 | 141 | void *buffer_page; /* ring buffer spare */ |
4e3c3333 | 142 | |
438ced17 | 143 | unsigned long entries; |
bc0c38d1 SR |
144 | unsigned long saved_latency; |
145 | unsigned long critical_start; | |
146 | unsigned long critical_end; | |
147 | unsigned long critical_sequence; | |
148 | unsigned long nice; | |
149 | unsigned long policy; | |
150 | unsigned long rt_priority; | |
2f26ebd5 | 151 | unsigned long skipped_entries; |
bc0c38d1 SR |
152 | cycle_t preempt_timestamp; |
153 | pid_t pid; | |
d20b92ab | 154 | kuid_t uid; |
bc0c38d1 | 155 | char comm[TASK_COMM_LEN]; |
3fdaf80f SRRH |
156 | |
157 | bool ignore_pid; | |
bc0c38d1 SR |
158 | }; |
159 | ||
2b6080f2 | 160 | struct tracer; |
37aea98b | 161 | struct trace_option_dentry; |
2b6080f2 | 162 | |
12883efb SRRH |
163 | struct trace_buffer { |
164 | struct trace_array *tr; | |
165 | struct ring_buffer *buffer; | |
166 | struct trace_array_cpu __percpu *data; | |
167 | cycle_t time_start; | |
168 | int cpu; | |
169 | }; | |
170 | ||
9a38a885 SRRH |
171 | #define TRACE_FLAGS_MAX_SIZE 32 |
172 | ||
37aea98b SRRH |
173 | struct trace_options { |
174 | struct tracer *tracer; | |
175 | struct trace_option_dentry *topts; | |
176 | }; | |
177 | ||
49090107 SRRH |
178 | struct trace_pid_list { |
179 | unsigned int nr_pids; | |
180 | int order; | |
181 | pid_t *pids; | |
182 | }; | |
183 | ||
bc0c38d1 SR |
184 | /* |
185 | * The trace array - an array of per-CPU trace arrays. This is the | |
186 | * highest level data structure that individual tracers deal with. | |
187 | * They have on/off state as well: | |
188 | */ | |
189 | struct trace_array { | |
ae63b31e | 190 | struct list_head list; |
277ba044 | 191 | char *name; |
12883efb SRRH |
192 | struct trace_buffer trace_buffer; |
193 | #ifdef CONFIG_TRACER_MAX_TRACE | |
194 | /* | |
195 | * The max_buffer is used to snapshot the trace when a maximum | |
196 | * latency is reached, or when the user initiates a snapshot. | |
197 | * Some tracers will use this to store a maximum trace while | |
198 | * it continues examining live traces. | |
199 | * | |
200 | * The buffers for the max_buffer are set up the same as the trace_buffer | |
201 | * When a snapshot is taken, the buffer of the max_buffer is swapped | |
202 | * with the buffer of the trace_buffer and the buffers are reset for | |
203 | * the trace_buffer so the tracing can continue. | |
204 | */ | |
205 | struct trace_buffer max_buffer; | |
45ad21ca | 206 | bool allocated_snapshot; |
6d9b3fa5 | 207 | unsigned long max_latency; |
12883efb | 208 | #endif |
49090107 | 209 | struct trace_pid_list __rcu *filtered_pids; |
0b9b12c1 SRRH |
210 | /* |
211 | * max_lock is used to protect the swapping of buffers | |
212 | * when taking a max snapshot. The buffers themselves are | |
213 | * protected by per_cpu spinlocks. But the action of the swap | |
214 | * needs its own lock. | |
215 | * | |
216 | * This is defined as a arch_spinlock_t in order to help | |
217 | * with performance when lockdep debugging is enabled. | |
218 | * | |
219 | * It is also used in other places outside the update_max_tr | |
220 | * so it needs to be defined outside of the | |
221 | * CONFIG_TRACER_MAX_TRACE. | |
222 | */ | |
223 | arch_spinlock_t max_lock; | |
499e5470 | 224 | int buffer_disabled; |
12ab74ee SR |
225 | #ifdef CONFIG_FTRACE_SYSCALLS |
226 | int sys_refcount_enter; | |
227 | int sys_refcount_exit; | |
7f1d2f82 SRRH |
228 | struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; |
229 | struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; | |
12ab74ee | 230 | #endif |
2b6080f2 SR |
231 | int stop_count; |
232 | int clock_id; | |
37aea98b | 233 | int nr_topts; |
2b6080f2 | 234 | struct tracer *current_trace; |
983f938a | 235 | unsigned int trace_flags; |
9a38a885 | 236 | unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; |
ae63b31e | 237 | unsigned int flags; |
2b6080f2 | 238 | raw_spinlock_t start_lock; |
ae63b31e | 239 | struct dentry *dir; |
2b6080f2 SR |
240 | struct dentry *options; |
241 | struct dentry *percpu_dir; | |
ae63b31e | 242 | struct dentry *event_dir; |
37aea98b | 243 | struct trace_options *topts; |
ae63b31e SR |
244 | struct list_head systems; |
245 | struct list_head events; | |
ccfe9e42 | 246 | cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
a695cb58 | 247 | int ref; |
f20a5806 SRRH |
248 | #ifdef CONFIG_FUNCTION_TRACER |
249 | struct ftrace_ops *ops; | |
250 | /* function tracing enabled */ | |
251 | int function_enabled; | |
252 | #endif | |
bc0c38d1 SR |
253 | }; |
254 | ||
ae63b31e SR |
255 | enum { |
256 | TRACE_ARRAY_FL_GLOBAL = (1 << 0) | |
257 | }; | |
258 | ||
259 | extern struct list_head ftrace_trace_arrays; | |
260 | ||
a8227415 AL |
261 | extern struct mutex trace_types_lock; |
262 | ||
8e2e2fa4 SRRH |
263 | extern int trace_array_get(struct trace_array *tr); |
264 | extern void trace_array_put(struct trace_array *tr); | |
265 | ||
ae63b31e SR |
266 | /* |
267 | * The global tracer (top) should be the first trace array added, | |
268 | * but we check the flag anyway. | |
269 | */ | |
270 | static inline struct trace_array *top_trace_array(void) | |
271 | { | |
272 | struct trace_array *tr; | |
273 | ||
da9c3413 | 274 | if (list_empty(&ftrace_trace_arrays)) |
dc81e5e3 YY |
275 | return NULL; |
276 | ||
ae63b31e SR |
277 | tr = list_entry(ftrace_trace_arrays.prev, |
278 | typeof(*tr), list); | |
279 | WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); | |
280 | return tr; | |
281 | } | |
282 | ||
7104f300 SR |
283 | #define FTRACE_CMP_TYPE(var, type) \ |
284 | __builtin_types_compatible_p(typeof(var), type *) | |
285 | ||
286 | #undef IF_ASSIGN | |
287 | #define IF_ASSIGN(var, entry, etype, id) \ | |
288 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
289 | var = (typeof(var))(entry); \ | |
290 | WARN_ON(id && (entry)->type != id); \ | |
291 | break; \ | |
292 | } | |
293 | ||
294 | /* Will cause compile errors if type is not found. */ | |
295 | extern void __ftrace_bad_type(void); | |
296 | ||
297 | /* | |
298 | * The trace_assign_type is a verifier that the entry type is | |
299 | * the same as the type being assigned. To add new types simply | |
300 | * add a line with the following format: | |
301 | * | |
302 | * IF_ASSIGN(var, ent, type, id); | |
303 | * | |
304 | * Where "type" is the trace type that includes the trace_entry | |
305 | * as the "ent" item. And "id" is the trace identifier that is | |
306 | * used in the trace_type enum. | |
307 | * | |
308 | * If the type can have more than one id, then use zero. | |
309 | */ | |
310 | #define trace_assign_type(var, ent) \ | |
311 | do { \ | |
312 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
313 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 314 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 315 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 316 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 317 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
09ae7234 | 318 | IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ |
7104f300 SR |
319 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
320 | TRACE_MMIO_RW); \ | |
321 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
322 | TRACE_MMIO_MAP); \ | |
9f029e83 | 323 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
324 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
325 | TRACE_GRAPH_ENT); \ | |
326 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
327 | TRACE_GRAPH_RET); \ | |
7104f300 SR |
328 | __ftrace_bad_type(); \ |
329 | } while (0) | |
2c4f035f | 330 | |
adf9f195 FW |
331 | /* |
332 | * An option specific to a tracer. This is a boolean value. | |
333 | * The bit is the bit index that sets its value on the | |
334 | * flags value in struct tracer_flags. | |
335 | */ | |
336 | struct tracer_opt { | |
9de36825 IM |
337 | const char *name; /* Will appear on the trace_options file */ |
338 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
339 | }; |
340 | ||
341 | /* | |
342 | * The set of specific options for a tracer. Your tracer | |
343 | * have to set the initial value of the flags val. | |
344 | */ | |
345 | struct tracer_flags { | |
346 | u32 val; | |
9de36825 | 347 | struct tracer_opt *opts; |
d39cdd20 | 348 | struct tracer *trace; |
adf9f195 FW |
349 | }; |
350 | ||
351 | /* Makes more easy to define a tracer opt */ | |
352 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
353 | ||
034939b6 | 354 | |
41d9c0be SRRH |
355 | struct trace_option_dentry { |
356 | struct tracer_opt *opt; | |
357 | struct tracer_flags *flags; | |
358 | struct trace_array *tr; | |
359 | struct dentry *entry; | |
360 | }; | |
361 | ||
6eaaa5d5 | 362 | /** |
8434dc93 | 363 | * struct tracer - a specific tracer and its callbacks to interact with tracefs |
6eaaa5d5 FW |
364 | * @name: the name chosen to select it on the available_tracers file |
365 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
366 | * @reset: called when one switches to another tracer | |
05a724bd CH |
367 | * @start: called when tracing is unpaused (echo 1 > tracing_on) |
368 | * @stop: called when tracing is paused (echo 0 > tracing_on) | |
6508fa76 | 369 | * @update_thresh: called when tracing_thresh is updated |
6eaaa5d5 FW |
370 | * @open: called when the trace file is opened |
371 | * @pipe_open: called when the trace_pipe file is opened | |
6eaaa5d5 | 372 | * @close: called when the trace file is released |
c521efd1 | 373 | * @pipe_close: called when the trace_pipe file is released |
6eaaa5d5 FW |
374 | * @read: override the default read callback on trace_pipe |
375 | * @splice_read: override the default splice_read callback on trace_pipe | |
376 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
377 | * @print_headers: override the first lines that describe your columns | |
378 | * @print_line: callback that prints a trace | |
379 | * @set_flag: signals one of your private flags changed (trace_options file) | |
380 | * @flags: your private flags | |
bc0c38d1 SR |
381 | */ |
382 | struct tracer { | |
383 | const char *name; | |
1c80025a | 384 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 385 | void (*reset)(struct trace_array *tr); |
9036990d SR |
386 | void (*start)(struct trace_array *tr); |
387 | void (*stop)(struct trace_array *tr); | |
6508fa76 | 388 | int (*update_thresh)(struct trace_array *tr); |
bc0c38d1 | 389 | void (*open)(struct trace_iterator *iter); |
107bad8b | 390 | void (*pipe_open)(struct trace_iterator *iter); |
bc0c38d1 | 391 | void (*close)(struct trace_iterator *iter); |
c521efd1 | 392 | void (*pipe_close)(struct trace_iterator *iter); |
107bad8b SR |
393 | ssize_t (*read)(struct trace_iterator *iter, |
394 | struct file *filp, char __user *ubuf, | |
395 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
396 | ssize_t (*splice_read)(struct trace_iterator *iter, |
397 | struct file *filp, | |
398 | loff_t *ppos, | |
399 | struct pipe_inode_info *pipe, | |
400 | size_t len, | |
401 | unsigned int flags); | |
60a11774 SR |
402 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
403 | int (*selftest)(struct tracer *trace, | |
404 | struct trace_array *tr); | |
405 | #endif | |
8bba1bf5 | 406 | void (*print_header)(struct seq_file *m); |
2c4f035f | 407 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 | 408 | /* If you handled the flag setting, return 0 */ |
8c1a49ae SRRH |
409 | int (*set_flag)(struct trace_array *tr, |
410 | u32 old_flags, u32 bit, int set); | |
613f04a0 | 411 | /* Return 0 if OK with change, else return non-zero */ |
bf6065b5 | 412 | int (*flag_changed)(struct trace_array *tr, |
613f04a0 | 413 | u32 mask, int set); |
bc0c38d1 | 414 | struct tracer *next; |
9de36825 | 415 | struct tracer_flags *flags; |
50512ab5 | 416 | int enabled; |
cf6ab6d9 | 417 | int ref; |
f43c738b | 418 | bool print_max; |
607e2ea1 | 419 | bool allow_instances; |
12883efb | 420 | #ifdef CONFIG_TRACER_MAX_TRACE |
f43c738b | 421 | bool use_max_tr; |
12883efb | 422 | #endif |
bc0c38d1 SR |
423 | }; |
424 | ||
f9520750 | 425 | |
e4a3f541 | 426 | /* Only current can touch trace_recursion */ |
e4a3f541 | 427 | |
edc15caf SR |
428 | /* |
429 | * For function tracing recursion: | |
430 | * The order of these bits are important. | |
431 | * | |
432 | * When function tracing occurs, the following steps are made: | |
433 | * If arch does not support a ftrace feature: | |
434 | * call internal function (uses INTERNAL bits) which calls... | |
435 | * If callback is registered to the "global" list, the list | |
436 | * function is called and recursion checks the GLOBAL bits. | |
437 | * then this function calls... | |
438 | * The function callback, which can use the FTRACE bits to | |
439 | * check for recursion. | |
440 | * | |
441 | * Now if the arch does not suppport a feature, and it calls | |
442 | * the global list function which calls the ftrace callback | |
443 | * all three of these steps will do a recursion protection. | |
444 | * There's no reason to do one if the previous caller already | |
445 | * did. The recursion that we are protecting against will | |
446 | * go through the same steps again. | |
447 | * | |
448 | * To prevent the multiple recursion checks, if a recursion | |
449 | * bit is set that is higher than the MAX bit of the current | |
450 | * check, then we know that the check was made by the previous | |
451 | * caller, and we can skip the current check. | |
452 | */ | |
e46cbf75 | 453 | enum { |
567cd4da SR |
454 | TRACE_BUFFER_BIT, |
455 | TRACE_BUFFER_NMI_BIT, | |
456 | TRACE_BUFFER_IRQ_BIT, | |
457 | TRACE_BUFFER_SIRQ_BIT, | |
458 | ||
459 | /* Start of function recursion bits */ | |
460 | TRACE_FTRACE_BIT, | |
edc15caf SR |
461 | TRACE_FTRACE_NMI_BIT, |
462 | TRACE_FTRACE_IRQ_BIT, | |
463 | TRACE_FTRACE_SIRQ_BIT, | |
e46cbf75 | 464 | |
4104d326 | 465 | /* INTERNAL_BITs must be greater than FTRACE_BITs */ |
edc15caf SR |
466 | TRACE_INTERNAL_BIT, |
467 | TRACE_INTERNAL_NMI_BIT, | |
468 | TRACE_INTERNAL_IRQ_BIT, | |
469 | TRACE_INTERNAL_SIRQ_BIT, | |
470 | ||
6224beb1 | 471 | TRACE_BRANCH_BIT, |
e4a3f541 SR |
472 | /* |
473 | * Abuse of the trace_recursion. | |
474 | * As we need a way to maintain state if we are tracing the function | |
475 | * graph in irq because we want to trace a particular function that | |
476 | * was called in irq context but we have irq tracing off. Since this | |
477 | * can only be modified by current, we can reuse trace_recursion. | |
478 | */ | |
e46cbf75 SR |
479 | TRACE_IRQ_BIT, |
480 | }; | |
e4a3f541 | 481 | |
e46cbf75 SR |
482 | #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) |
483 | #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) | |
484 | #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) | |
e4a3f541 | 485 | |
edc15caf SR |
486 | #define TRACE_CONTEXT_BITS 4 |
487 | ||
488 | #define TRACE_FTRACE_START TRACE_FTRACE_BIT | |
489 | #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) | |
490 | ||
edc15caf SR |
491 | #define TRACE_LIST_START TRACE_INTERNAL_BIT |
492 | #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) | |
493 | ||
494 | #define TRACE_CONTEXT_MASK TRACE_LIST_MAX | |
495 | ||
496 | static __always_inline int trace_get_context_bit(void) | |
497 | { | |
498 | int bit; | |
499 | ||
500 | if (in_interrupt()) { | |
501 | if (in_nmi()) | |
502 | bit = 0; | |
503 | ||
504 | else if (in_irq()) | |
505 | bit = 1; | |
506 | else | |
507 | bit = 2; | |
508 | } else | |
509 | bit = 3; | |
510 | ||
511 | return bit; | |
512 | } | |
513 | ||
514 | static __always_inline int trace_test_and_set_recursion(int start, int max) | |
515 | { | |
516 | unsigned int val = current->trace_recursion; | |
517 | int bit; | |
518 | ||
519 | /* A previous recursion check was made */ | |
520 | if ((val & TRACE_CONTEXT_MASK) > max) | |
521 | return 0; | |
522 | ||
523 | bit = trace_get_context_bit() + start; | |
524 | if (unlikely(val & (1 << bit))) | |
525 | return -1; | |
526 | ||
527 | val |= 1 << bit; | |
528 | current->trace_recursion = val; | |
529 | barrier(); | |
530 | ||
531 | return bit; | |
532 | } | |
533 | ||
534 | static __always_inline void trace_clear_recursion(int bit) | |
535 | { | |
536 | unsigned int val = current->trace_recursion; | |
537 | ||
538 | if (!bit) | |
539 | return; | |
540 | ||
541 | bit = 1 << bit; | |
542 | val &= ~bit; | |
543 | ||
544 | barrier(); | |
545 | current->trace_recursion = val; | |
546 | } | |
547 | ||
6d158a81 SR |
548 | static inline struct ring_buffer_iter * |
549 | trace_buffer_iter(struct trace_iterator *iter, int cpu) | |
550 | { | |
551 | if (iter->buffer_iter && iter->buffer_iter[cpu]) | |
552 | return iter->buffer_iter[cpu]; | |
553 | return NULL; | |
554 | } | |
555 | ||
b6f11df2 | 556 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 557 | int tracing_is_enabled(void); |
12883efb SRRH |
558 | void tracing_reset(struct trace_buffer *buf, int cpu); |
559 | void tracing_reset_online_cpus(struct trace_buffer *buf); | |
9456f0fa | 560 | void tracing_reset_current(int cpu); |
873c642f | 561 | void tracing_reset_all_online_cpus(void); |
bc0c38d1 | 562 | int tracing_open_generic(struct inode *inode, struct file *filp); |
2e86421d | 563 | bool tracing_is_disabled(void); |
5452af66 | 564 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 565 | umode_t mode, |
5452af66 FW |
566 | struct dentry *parent, |
567 | void *data, | |
568 | const struct file_operations *fops); | |
569 | ||
bc0c38d1 | 570 | struct dentry *tracing_init_dentry(void); |
d618b3e6 | 571 | |
51a763dd ACM |
572 | struct ring_buffer_event; |
573 | ||
e77405ad SR |
574 | struct ring_buffer_event * |
575 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
576 | int type, | |
577 | unsigned long len, | |
578 | unsigned long flags, | |
579 | int pc); | |
51a763dd | 580 | |
45dcd8b8 PP |
581 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
582 | struct trace_array_cpu *data); | |
c4a8e8be FW |
583 | |
584 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
585 | int *ent_cpu, u64 *ent_ts); | |
586 | ||
7ffbd48d SR |
587 | void __buffer_unlock_commit(struct ring_buffer *buffer, |
588 | struct ring_buffer_event *event); | |
589 | ||
955b61e5 JW |
590 | int trace_empty(struct trace_iterator *iter); |
591 | ||
592 | void *trace_find_next_entry_inc(struct trace_iterator *iter); | |
593 | ||
594 | void trace_init_global_iter(struct trace_iterator *iter); | |
595 | ||
596 | void tracing_iter_reset(struct trace_iterator *iter, int cpu); | |
597 | ||
6fb44b71 | 598 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
599 | unsigned long ip, |
600 | unsigned long parent_ip, | |
38697053 | 601 | unsigned long flags, int pc); |
0a772620 JO |
602 | void trace_graph_function(struct trace_array *tr, |
603 | unsigned long ip, | |
604 | unsigned long parent_ip, | |
605 | unsigned long flags, int pc); | |
7e9a49ef | 606 | void trace_latency_header(struct seq_file *m); |
62b915f1 JO |
607 | void trace_default_header(struct seq_file *m); |
608 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter); | |
609 | int trace_empty(struct trace_iterator *iter); | |
bc0c38d1 | 610 | |
287b6e68 | 611 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 612 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1a0799a8 | 613 | void set_graph_array(struct trace_array *tr); |
1e9b51c2 | 614 | |
41bc8144 SR |
615 | void tracing_start_cmdline_record(void); |
616 | void tracing_stop_cmdline_record(void); | |
bc0c38d1 | 617 | int register_tracer(struct tracer *type); |
b5130b1e | 618 | int is_tracing_stopped(void); |
955b61e5 | 619 | |
098c879e SRRH |
620 | loff_t tracing_lseek(struct file *file, loff_t offset, int whence); |
621 | ||
955b61e5 JW |
622 | extern cpumask_var_t __read_mostly tracing_buffer_mask; |
623 | ||
624 | #define for_each_tracing_cpu(cpu) \ | |
625 | for_each_cpu(cpu, tracing_buffer_mask) | |
bc0c38d1 SR |
626 | |
627 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
628 | ||
0e950173 TB |
629 | extern unsigned long tracing_thresh; |
630 | ||
5d4a9dba | 631 | #ifdef CONFIG_TRACER_MAX_TRACE |
bc0c38d1 SR |
632 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); |
633 | void update_max_tr_single(struct trace_array *tr, | |
634 | struct task_struct *tsk, int cpu); | |
5d4a9dba | 635 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 636 | |
c0a0d0d3 | 637 | #ifdef CONFIG_STACKTRACE |
e77405ad | 638 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
639 | int pc); |
640 | ||
641 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, | |
642 | int pc); | |
643 | #else | |
e1f7992e | 644 | static inline void ftrace_trace_userstack(struct ring_buffer *buffer, |
c0a0d0d3 FW |
645 | unsigned long flags, int pc) |
646 | { | |
647 | } | |
648 | ||
649 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags, | |
650 | int skip, int pc) | |
651 | { | |
652 | } | |
653 | #endif /* CONFIG_STACKTRACE */ | |
53614991 | 654 | |
e309b41d | 655 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 656 | |
4ca53085 | 657 | extern void trace_find_cmdline(int pid, char comm[]); |
f7d48cbd | 658 | |
bc0c38d1 SR |
659 | #ifdef CONFIG_DYNAMIC_FTRACE |
660 | extern unsigned long ftrace_update_tot_cnt; | |
ad97772a | 661 | #endif |
d05cdb25 SR |
662 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
663 | extern int DYN_FTRACE_TEST_NAME(void); | |
95950c2e SR |
664 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 |
665 | extern int DYN_FTRACE_TEST_NAME2(void); | |
bc0c38d1 | 666 | |
55034cd6 | 667 | extern bool ring_buffer_expanded; |
020e5f85 LZ |
668 | extern bool tracing_selftest_disabled; |
669 | ||
60a11774 | 670 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
671 | extern int trace_selftest_startup_function(struct tracer *trace, |
672 | struct trace_array *tr); | |
7447dce9 FW |
673 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
674 | struct trace_array *tr); | |
60a11774 SR |
675 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
676 | struct trace_array *tr); | |
60a11774 SR |
677 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
678 | struct trace_array *tr); | |
60a11774 SR |
679 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
680 | struct trace_array *tr); | |
60a11774 SR |
681 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
682 | struct trace_array *tr); | |
fb1b6d8b SN |
683 | extern int trace_selftest_startup_nop(struct tracer *trace, |
684 | struct trace_array *tr); | |
60a11774 SR |
685 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
686 | struct trace_array *tr); | |
80e5ea45 SR |
687 | extern int trace_selftest_startup_branch(struct tracer *trace, |
688 | struct trace_array *tr); | |
8f768993 SRRH |
689 | /* |
690 | * Tracer data references selftest functions that only occur | |
691 | * on boot up. These can be __init functions. Thus, when selftests | |
692 | * are enabled, then the tracers need to reference __init functions. | |
693 | */ | |
694 | #define __tracer_data __refdata | |
695 | #else | |
696 | /* Tracers are seldom changed. Optimize when selftests are disabled. */ | |
697 | #define __tracer_data __read_mostly | |
60a11774 SR |
698 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
699 | ||
c7aafc54 | 700 | extern void *head_page(struct trace_array_cpu *data); |
cf8e3474 | 701 | extern unsigned long long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 702 | extern int |
40ce74f1 | 703 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 704 | extern int |
40ce74f1 | 705 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
659372d3 SR |
706 | extern int |
707 | trace_array_vprintk(struct trace_array *tr, | |
708 | unsigned long ip, const char *fmt, va_list args); | |
709 | int trace_array_printk(struct trace_array *tr, | |
710 | unsigned long ip, const char *fmt, ...); | |
12883efb SRRH |
711 | int trace_array_printk_buf(struct ring_buffer *buffer, |
712 | unsigned long ip, const char *fmt, ...); | |
955b61e5 JW |
713 | void trace_printk_seq(struct trace_seq *s); |
714 | enum print_line_t print_trace_line(struct trace_iterator *iter); | |
c7aafc54 | 715 | |
8e1e1df2 BP |
716 | extern char trace_find_mark(unsigned long long duration); |
717 | ||
15e6cb36 | 718 | /* Standard output formatting function used for function return traces */ |
fb52607a | 719 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
62b915f1 JO |
720 | |
721 | /* Flag options */ | |
722 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1 | |
723 | #define TRACE_GRAPH_PRINT_CPU 0x2 | |
724 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 | |
725 | #define TRACE_GRAPH_PRINT_PROC 0x8 | |
726 | #define TRACE_GRAPH_PRINT_DURATION 0x10 | |
727 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 | |
ccdb5946 | 728 | #define TRACE_GRAPH_PRINT_IRQS 0x40 |
607e3a29 | 729 | #define TRACE_GRAPH_PRINT_TAIL 0x80 |
55577204 SRRH |
730 | #define TRACE_GRAPH_SLEEP_TIME 0x100 |
731 | #define TRACE_GRAPH_GRAPH_TIME 0x200 | |
6fc84ea7 SRRH |
732 | #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 |
733 | #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) | |
62b915f1 | 734 | |
55577204 SRRH |
735 | extern void ftrace_graph_sleep_time_control(bool enable); |
736 | extern void ftrace_graph_graph_time_control(bool enable); | |
737 | ||
d7a8d9e9 JO |
738 | extern enum print_line_t |
739 | print_graph_function_flags(struct trace_iterator *iter, u32 flags); | |
740 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags); | |
9d9add34 | 741 | extern void |
0706f1c4 | 742 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); |
62b915f1 JO |
743 | extern void graph_trace_open(struct trace_iterator *iter); |
744 | extern void graph_trace_close(struct trace_iterator *iter); | |
745 | extern int __trace_graph_entry(struct trace_array *tr, | |
746 | struct ftrace_graph_ent *trace, | |
747 | unsigned long flags, int pc); | |
748 | extern void __trace_graph_return(struct trace_array *tr, | |
749 | struct ftrace_graph_ret *trace, | |
750 | unsigned long flags, int pc); | |
751 | ||
ea4e2bc4 SR |
752 | |
753 | #ifdef CONFIG_DYNAMIC_FTRACE | |
754 | /* TODO: make this variable */ | |
755 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
756 | extern int ftrace_graph_count; | |
757 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
29ad23b0 NK |
758 | extern int ftrace_graph_notrace_count; |
759 | extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
ea4e2bc4 SR |
760 | |
761 | static inline int ftrace_graph_addr(unsigned long addr) | |
762 | { | |
763 | int i; | |
764 | ||
9aa72b4b | 765 | if (!ftrace_graph_count) |
ea4e2bc4 SR |
766 | return 1; |
767 | ||
768 | for (i = 0; i < ftrace_graph_count; i++) { | |
e4a3f541 SR |
769 | if (addr == ftrace_graph_funcs[i]) { |
770 | /* | |
771 | * If no irqs are to be traced, but a set_graph_function | |
772 | * is set, and called by an interrupt handler, we still | |
773 | * want to trace it. | |
774 | */ | |
775 | if (in_irq()) | |
776 | trace_recursion_set(TRACE_IRQ_BIT); | |
777 | else | |
778 | trace_recursion_clear(TRACE_IRQ_BIT); | |
ea4e2bc4 | 779 | return 1; |
e4a3f541 | 780 | } |
ea4e2bc4 SR |
781 | } |
782 | ||
783 | return 0; | |
784 | } | |
29ad23b0 NK |
785 | |
786 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
787 | { | |
788 | int i; | |
789 | ||
790 | if (!ftrace_graph_notrace_count) | |
791 | return 0; | |
792 | ||
793 | for (i = 0; i < ftrace_graph_notrace_count; i++) { | |
794 | if (addr == ftrace_graph_notrace_funcs[i]) | |
795 | return 1; | |
796 | } | |
797 | ||
798 | return 0; | |
799 | } | |
15e6cb36 | 800 | #else |
6b253930 IM |
801 | static inline int ftrace_graph_addr(unsigned long addr) |
802 | { | |
803 | return 1; | |
ea4e2bc4 | 804 | } |
29ad23b0 NK |
805 | |
806 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
807 | { | |
808 | return 0; | |
809 | } | |
ea4e2bc4 | 810 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
ea4e2bc4 | 811 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 812 | static inline enum print_line_t |
d7a8d9e9 | 813 | print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
15e6cb36 FW |
814 | { |
815 | return TRACE_TYPE_UNHANDLED; | |
816 | } | |
ea4e2bc4 | 817 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 818 | |
756d17ee | 819 | extern struct list_head ftrace_pids; |
804a6851 | 820 | |
1155de47 | 821 | #ifdef CONFIG_FUNCTION_TRACER |
f1ed7c74 | 822 | extern bool ftrace_filter_param __initdata; |
804a6851 SR |
823 | static inline int ftrace_trace_task(struct task_struct *task) |
824 | { | |
756d17ee | 825 | if (list_empty(&ftrace_pids)) |
804a6851 SR |
826 | return 1; |
827 | ||
828 | return test_tsk_trace_trace(task); | |
829 | } | |
e0a413f6 | 830 | extern int ftrace_is_dead(void); |
591dffda SRRH |
831 | int ftrace_create_function_files(struct trace_array *tr, |
832 | struct dentry *parent); | |
833 | void ftrace_destroy_function_files(struct trace_array *tr); | |
4104d326 SRRH |
834 | void ftrace_init_global_array_ops(struct trace_array *tr); |
835 | void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); | |
836 | void ftrace_reset_array_ops(struct trace_array *tr); | |
7eea4fce | 837 | int using_ftrace_ops_list_func(void); |
1155de47 PM |
838 | #else |
839 | static inline int ftrace_trace_task(struct task_struct *task) | |
840 | { | |
841 | return 1; | |
842 | } | |
e0a413f6 | 843 | static inline int ftrace_is_dead(void) { return 0; } |
591dffda SRRH |
844 | static inline int |
845 | ftrace_create_function_files(struct trace_array *tr, | |
846 | struct dentry *parent) | |
847 | { | |
848 | return 0; | |
849 | } | |
850 | static inline void ftrace_destroy_function_files(struct trace_array *tr) { } | |
4104d326 SRRH |
851 | static inline __init void |
852 | ftrace_init_global_array_ops(struct trace_array *tr) { } | |
853 | static inline void ftrace_reset_array_ops(struct trace_array *tr) { } | |
854 | /* ftace_func_t type is not defined, use macro instead of static inline */ | |
855 | #define ftrace_init_array_ops(tr, func) do { } while (0) | |
591dffda SRRH |
856 | #endif /* CONFIG_FUNCTION_TRACER */ |
857 | ||
858 | #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) | |
859 | void ftrace_create_filter_files(struct ftrace_ops *ops, | |
860 | struct dentry *parent); | |
861 | void ftrace_destroy_filter_files(struct ftrace_ops *ops); | |
862 | #else | |
863 | /* | |
864 | * The ops parameter passed in is usually undefined. | |
865 | * This must be a macro. | |
866 | */ | |
867 | #define ftrace_create_filter_files(ops, parent) do { } while (0) | |
868 | #define ftrace_destroy_filter_files(ops) do { } while (0) | |
869 | #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ | |
804a6851 | 870 | |
c6650b2e | 871 | bool ftrace_event_is_function(struct trace_event_call *call); |
ced39002 | 872 | |
b63f39ea | 873 | /* |
874 | * struct trace_parser - servers for reading the user input separated by spaces | |
875 | * @cont: set if the input is not complete - no final space char was found | |
876 | * @buffer: holds the parsed user input | |
1537a363 | 877 | * @idx: user input length |
b63f39ea | 878 | * @size: buffer size |
879 | */ | |
880 | struct trace_parser { | |
881 | bool cont; | |
882 | char *buffer; | |
883 | unsigned idx; | |
884 | unsigned size; | |
885 | }; | |
886 | ||
887 | static inline bool trace_parser_loaded(struct trace_parser *parser) | |
888 | { | |
889 | return (parser->idx != 0); | |
890 | } | |
891 | ||
892 | static inline bool trace_parser_cont(struct trace_parser *parser) | |
893 | { | |
894 | return parser->cont; | |
895 | } | |
896 | ||
897 | static inline void trace_parser_clear(struct trace_parser *parser) | |
898 | { | |
899 | parser->cont = false; | |
900 | parser->idx = 0; | |
901 | } | |
902 | ||
903 | extern int trace_parser_get_init(struct trace_parser *parser, int size); | |
904 | extern void trace_parser_put(struct trace_parser *parser); | |
905 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
906 | size_t cnt, loff_t *ppos); | |
907 | ||
729358da SRRH |
908 | /* |
909 | * Only create function graph options if function graph is configured. | |
910 | */ | |
911 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
912 | # define FGRAPH_FLAGS \ | |
729358da | 913 | C(DISPLAY_GRAPH, "display-graph"), |
729358da SRRH |
914 | #else |
915 | # define FGRAPH_FLAGS | |
729358da SRRH |
916 | #endif |
917 | ||
4ee4301c SRRH |
918 | #ifdef CONFIG_BRANCH_TRACER |
919 | # define BRANCH_FLAGS \ | |
920 | C(BRANCH, "branch"), | |
921 | #else | |
922 | # define BRANCH_FLAGS | |
923 | #endif | |
924 | ||
8179e8a1 SRRH |
925 | #ifdef CONFIG_FUNCTION_TRACER |
926 | # define FUNCTION_FLAGS \ | |
927 | C(FUNCTION, "function-trace"), | |
928 | # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION | |
929 | #else | |
930 | # define FUNCTION_FLAGS | |
931 | # define FUNCTION_DEFAULT_FLAGS 0UL | |
932 | #endif | |
933 | ||
73dddbb5 SRRH |
934 | #ifdef CONFIG_STACKTRACE |
935 | # define STACK_FLAGS \ | |
936 | C(STACKTRACE, "stacktrace"), | |
937 | #else | |
938 | # define STACK_FLAGS | |
939 | #endif | |
940 | ||
4fcdae83 SR |
941 | /* |
942 | * trace_iterator_flags is an enumeration that defines bit | |
943 | * positions into trace_flags that controls the output. | |
944 | * | |
945 | * NOTE: These bits must match the trace_options array in | |
a3418a36 | 946 | * trace.c (this macro guarantees it). |
4fcdae83 | 947 | */ |
a3418a36 SRRH |
948 | #define TRACE_FLAGS \ |
949 | C(PRINT_PARENT, "print-parent"), \ | |
950 | C(SYM_OFFSET, "sym-offset"), \ | |
951 | C(SYM_ADDR, "sym-addr"), \ | |
952 | C(VERBOSE, "verbose"), \ | |
953 | C(RAW, "raw"), \ | |
954 | C(HEX, "hex"), \ | |
955 | C(BIN, "bin"), \ | |
956 | C(BLOCK, "block"), \ | |
a3418a36 | 957 | C(PRINTK, "trace_printk"), \ |
a3418a36 SRRH |
958 | C(ANNOTATE, "annotate"), \ |
959 | C(USERSTACKTRACE, "userstacktrace"), \ | |
960 | C(SYM_USEROBJ, "sym-userobj"), \ | |
961 | C(PRINTK_MSGONLY, "printk-msg-only"), \ | |
962 | C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ | |
963 | C(LATENCY_FMT, "latency-format"), \ | |
a3418a36 SRRH |
964 | C(RECORD_CMD, "record-cmd"), \ |
965 | C(OVERWRITE, "overwrite"), \ | |
966 | C(STOP_ON_FREE, "disable_on_free"), \ | |
967 | C(IRQ_INFO, "irq-info"), \ | |
968 | C(MARKERS, "markers"), \ | |
8179e8a1 | 969 | FUNCTION_FLAGS \ |
4ee4301c | 970 | FGRAPH_FLAGS \ |
73dddbb5 | 971 | STACK_FLAGS \ |
4ee4301c | 972 | BRANCH_FLAGS |
ce3fed62 | 973 | |
a3418a36 SRRH |
974 | /* |
975 | * By defining C, we can make TRACE_FLAGS a list of bit names | |
976 | * that will define the bits for the flag masks. | |
977 | */ | |
978 | #undef C | |
979 | #define C(a, b) TRACE_ITER_##a##_BIT | |
980 | ||
b5e87c05 SRRH |
981 | enum trace_iterator_bits { |
982 | TRACE_FLAGS | |
983 | /* Make sure we don't go more than we have bits for */ | |
984 | TRACE_ITER_LAST_BIT | |
985 | }; | |
a3418a36 SRRH |
986 | |
987 | /* | |
988 | * By redefining C, we can make TRACE_FLAGS a list of masks that | |
989 | * use the bits as defined above. | |
990 | */ | |
991 | #undef C | |
992 | #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) | |
993 | ||
994 | enum trace_iterator_flags { TRACE_FLAGS }; | |
4e655519 | 995 | |
15e6cb36 FW |
996 | /* |
997 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
998 | * control the output of kernel symbols. | |
999 | */ | |
1000 | #define TRACE_ITER_SYM_MASK \ | |
1001 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
1002 | ||
43a15386 FW |
1003 | extern struct tracer nop_trace; |
1004 | ||
2ed84eeb | 1005 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
1006 | extern int enable_branch_tracing(struct trace_array *tr); |
1007 | extern void disable_branch_tracing(void); | |
1008 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 1009 | { |
983f938a | 1010 | if (tr->trace_flags & TRACE_ITER_BRANCH) |
9f029e83 | 1011 | return enable_branch_tracing(tr); |
52f232cb SR |
1012 | return 0; |
1013 | } | |
9f029e83 | 1014 | static inline void trace_branch_disable(void) |
52f232cb SR |
1015 | { |
1016 | /* due to races, always disable */ | |
9f029e83 | 1017 | disable_branch_tracing(); |
52f232cb SR |
1018 | } |
1019 | #else | |
9f029e83 | 1020 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
1021 | { |
1022 | return 0; | |
1023 | } | |
9f029e83 | 1024 | static inline void trace_branch_disable(void) |
52f232cb SR |
1025 | { |
1026 | } | |
2ed84eeb | 1027 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 1028 | |
1852fcce SR |
1029 | /* set ring buffers to default size if not already done so */ |
1030 | int tracing_update_buffers(void); | |
1031 | ||
cf027f64 TZ |
1032 | struct ftrace_event_field { |
1033 | struct list_head link; | |
92edca07 SR |
1034 | const char *name; |
1035 | const char *type; | |
aa38e9fc | 1036 | int filter_type; |
cf027f64 TZ |
1037 | int offset; |
1038 | int size; | |
a118e4d1 | 1039 | int is_signed; |
cf027f64 TZ |
1040 | }; |
1041 | ||
30e673b2 | 1042 | struct event_filter { |
c9c53ca0 SR |
1043 | int n_preds; /* Number assigned */ |
1044 | int a_preds; /* allocated */ | |
74e9e58c | 1045 | struct filter_pred *preds; |
61e9dea2 | 1046 | struct filter_pred *root; |
8b372562 | 1047 | char *filter_string; |
30e673b2 TZ |
1048 | }; |
1049 | ||
cfb180f3 TZ |
1050 | struct event_subsystem { |
1051 | struct list_head list; | |
1052 | const char *name; | |
1f9963cb | 1053 | struct event_filter *filter; |
e9dbfae5 | 1054 | int ref_count; |
cfb180f3 TZ |
1055 | }; |
1056 | ||
7967b3e0 | 1057 | struct trace_subsystem_dir { |
ae63b31e SR |
1058 | struct list_head list; |
1059 | struct event_subsystem *subsystem; | |
1060 | struct trace_array *tr; | |
1061 | struct dentry *entry; | |
1062 | int ref_count; | |
1063 | int nr_events; | |
1064 | }; | |
1065 | ||
61e9dea2 SR |
1066 | #define FILTER_PRED_INVALID ((unsigned short)-1) |
1067 | #define FILTER_PRED_IS_RIGHT (1 << 15) | |
43cd4145 | 1068 | #define FILTER_PRED_FOLD (1 << 15) |
61e9dea2 | 1069 | |
bf93f9ed SR |
1070 | /* |
1071 | * The max preds is the size of unsigned short with | |
1072 | * two flags at the MSBs. One bit is used for both the IS_RIGHT | |
1073 | * and FOLD flags. The other is reserved. | |
1074 | * | |
1075 | * 2^14 preds is way more than enough. | |
1076 | */ | |
1077 | #define MAX_FILTER_PRED 16384 | |
4a3d27e9 | 1078 | |
7ce7e424 | 1079 | struct filter_pred; |
1889d209 | 1080 | struct regex; |
7ce7e424 | 1081 | |
58d9a597 | 1082 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); |
7ce7e424 | 1083 | |
1889d209 FW |
1084 | typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
1085 | ||
3f6fe06d | 1086 | enum regex_type { |
b0f1a59a | 1087 | MATCH_FULL = 0, |
3f6fe06d FW |
1088 | MATCH_FRONT_ONLY, |
1089 | MATCH_MIDDLE_ONLY, | |
1090 | MATCH_END_ONLY, | |
1091 | }; | |
1092 | ||
1889d209 FW |
1093 | struct regex { |
1094 | char pattern[MAX_FILTER_STR_VAL]; | |
1095 | int len; | |
1096 | int field_len; | |
1097 | regex_match_func match; | |
1098 | }; | |
1099 | ||
7ce7e424 | 1100 | struct filter_pred { |
1889d209 FW |
1101 | filter_pred_fn_t fn; |
1102 | u64 val; | |
1103 | struct regex regex; | |
61aaef55 | 1104 | unsigned short *ops; |
1d0e78e3 | 1105 | struct ftrace_event_field *field; |
1889d209 FW |
1106 | int offset; |
1107 | int not; | |
1108 | int op; | |
61e9dea2 SR |
1109 | unsigned short index; |
1110 | unsigned short parent; | |
1111 | unsigned short left; | |
1112 | unsigned short right; | |
7ce7e424 TZ |
1113 | }; |
1114 | ||
3f6fe06d FW |
1115 | extern enum regex_type |
1116 | filter_parse_regex(char *buff, int len, char **search, int *not); | |
7f1d2f82 | 1117 | extern void print_event_filter(struct trace_event_file *file, |
4bda2d51 | 1118 | struct trace_seq *s); |
7f1d2f82 | 1119 | extern int apply_event_filter(struct trace_event_file *file, |
8b372562 | 1120 | char *filter_string); |
7967b3e0 | 1121 | extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, |
8b372562 TZ |
1122 | char *filter_string); |
1123 | extern void print_subsystem_event_filter(struct event_subsystem *system, | |
ac1adc55 | 1124 | struct trace_seq *s); |
aa38e9fc | 1125 | extern int filter_assign_type(const char *type); |
2425bcb9 | 1126 | extern int create_event_filter(struct trace_event_call *call, |
bac5fb97 TZ |
1127 | char *filter_str, bool set_str, |
1128 | struct event_filter **filterp); | |
1129 | extern void free_event_filter(struct event_filter *filter); | |
7ce7e424 | 1130 | |
b3a8c6fd | 1131 | struct ftrace_event_field * |
2425bcb9 | 1132 | trace_find_event_field(struct trace_event_call *call, char *name); |
2e33af02 | 1133 | |
e870e9a1 | 1134 | extern void trace_event_enable_cmd_record(bool enable); |
277ba044 | 1135 | extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); |
0c8916c3 | 1136 | extern int event_trace_del_tracer(struct trace_array *tr); |
e870e9a1 | 1137 | |
7f1d2f82 SRRH |
1138 | extern struct trace_event_file *find_event_file(struct trace_array *tr, |
1139 | const char *system, | |
1140 | const char *event); | |
7862ad18 | 1141 | |
85f2b082 TZ |
1142 | static inline void *event_file_data(struct file *filp) |
1143 | { | |
1144 | return ACCESS_ONCE(file_inode(filp)->i_private); | |
1145 | } | |
1146 | ||
20c8928a | 1147 | extern struct mutex event_mutex; |
a59fd602 | 1148 | extern struct list_head ftrace_events; |
ac199db0 | 1149 | |
85f2b082 TZ |
1150 | extern const struct file_operations event_trigger_fops; |
1151 | ||
1152 | extern int register_trigger_cmds(void); | |
1153 | extern void clear_event_triggers(struct trace_array *tr); | |
1154 | ||
1155 | struct event_trigger_data { | |
1156 | unsigned long count; | |
1157 | int ref; | |
1158 | struct event_trigger_ops *ops; | |
1159 | struct event_command *cmd_ops; | |
d8a30f20 | 1160 | struct event_filter __rcu *filter; |
85f2b082 TZ |
1161 | char *filter_str; |
1162 | void *private_data; | |
1163 | struct list_head list; | |
1164 | }; | |
1165 | ||
1166 | /** | |
1167 | * struct event_trigger_ops - callbacks for trace event triggers | |
1168 | * | |
1169 | * The methods in this structure provide per-event trigger hooks for | |
1170 | * various trigger operations. | |
1171 | * | |
1172 | * All the methods below, except for @init() and @free(), must be | |
1173 | * implemented. | |
1174 | * | |
1175 | * @func: The trigger 'probe' function called when the triggering | |
1176 | * event occurs. The data passed into this callback is the data | |
1177 | * that was supplied to the event_command @reg() function that | |
1178 | * registered the trigger (see struct event_command). | |
1179 | * | |
1180 | * @init: An optional initialization function called for the trigger | |
1181 | * when the trigger is registered (via the event_command reg() | |
1182 | * function). This can be used to perform per-trigger | |
1183 | * initialization such as incrementing a per-trigger reference | |
1184 | * count, for instance. This is usually implemented by the | |
1185 | * generic utility function @event_trigger_init() (see | |
1186 | * trace_event_triggers.c). | |
1187 | * | |
1188 | * @free: An optional de-initialization function called for the | |
1189 | * trigger when the trigger is unregistered (via the | |
1190 | * event_command @reg() function). This can be used to perform | |
1191 | * per-trigger de-initialization such as decrementing a | |
1192 | * per-trigger reference count and freeing corresponding trigger | |
1193 | * data, for instance. This is usually implemented by the | |
1194 | * generic utility function @event_trigger_free() (see | |
1195 | * trace_event_triggers.c). | |
1196 | * | |
1197 | * @print: The callback function invoked to have the trigger print | |
1198 | * itself. This is usually implemented by a wrapper function | |
1199 | * that calls the generic utility function @event_trigger_print() | |
1200 | * (see trace_event_triggers.c). | |
1201 | */ | |
1202 | struct event_trigger_ops { | |
1203 | void (*func)(struct event_trigger_data *data); | |
1204 | int (*init)(struct event_trigger_ops *ops, | |
1205 | struct event_trigger_data *data); | |
1206 | void (*free)(struct event_trigger_ops *ops, | |
1207 | struct event_trigger_data *data); | |
1208 | int (*print)(struct seq_file *m, | |
1209 | struct event_trigger_ops *ops, | |
1210 | struct event_trigger_data *data); | |
1211 | }; | |
1212 | ||
1213 | /** | |
1214 | * struct event_command - callbacks and data members for event commands | |
1215 | * | |
1216 | * Event commands are invoked by users by writing the command name | |
1217 | * into the 'trigger' file associated with a trace event. The | |
1218 | * parameters associated with a specific invocation of an event | |
1219 | * command are used to create an event trigger instance, which is | |
1220 | * added to the list of trigger instances associated with that trace | |
1221 | * event. When the event is hit, the set of triggers associated with | |
1222 | * that event is invoked. | |
1223 | * | |
1224 | * The data members in this structure provide per-event command data | |
1225 | * for various event commands. | |
1226 | * | |
1227 | * All the data members below, except for @post_trigger, must be set | |
1228 | * for each event command. | |
1229 | * | |
1230 | * @name: The unique name that identifies the event command. This is | |
1231 | * the name used when setting triggers via trigger files. | |
1232 | * | |
1233 | * @trigger_type: A unique id that identifies the event command | |
1234 | * 'type'. This value has two purposes, the first to ensure that | |
1235 | * only one trigger of the same type can be set at a given time | |
1236 | * for a particular event e.g. it doesn't make sense to have both | |
1237 | * a traceon and traceoff trigger attached to a single event at | |
1238 | * the same time, so traceon and traceoff have the same type | |
1239 | * though they have different names. The @trigger_type value is | |
1240 | * also used as a bit value for deferring the actual trigger | |
1241 | * action until after the current event is finished. Some | |
1242 | * commands need to do this if they themselves log to the trace | |
1243 | * buffer (see the @post_trigger() member below). @trigger_type | |
1244 | * values are defined by adding new values to the trigger_type | |
af658dca | 1245 | * enum in include/linux/trace_events.h. |
85f2b082 TZ |
1246 | * |
1247 | * @post_trigger: A flag that says whether or not this command needs | |
1248 | * to have its action delayed until after the current event has | |
1249 | * been closed. Some triggers need to avoid being invoked while | |
1250 | * an event is currently in the process of being logged, since | |
1251 | * the trigger may itself log data into the trace buffer. Thus | |
1252 | * we make sure the current event is committed before invoking | |
1253 | * those triggers. To do that, the trigger invocation is split | |
1254 | * in two - the first part checks the filter using the current | |
1255 | * trace record; if a command has the @post_trigger flag set, it | |
1256 | * sets a bit for itself in the return value, otherwise it | |
1257 | * directly invokes the trigger. Once all commands have been | |
1258 | * either invoked or set their return flag, the current record is | |
1259 | * either committed or discarded. At that point, if any commands | |
1260 | * have deferred their triggers, those commands are finally | |
1261 | * invoked following the close of the current event. In other | |
1262 | * words, if the event_trigger_ops @func() probe implementation | |
1263 | * itself logs to the trace buffer, this flag should be set, | |
1264 | * otherwise it can be left unspecified. | |
1265 | * | |
1266 | * All the methods below, except for @set_filter(), must be | |
1267 | * implemented. | |
1268 | * | |
1269 | * @func: The callback function responsible for parsing and | |
1270 | * registering the trigger written to the 'trigger' file by the | |
1271 | * user. It allocates the trigger instance and registers it with | |
1272 | * the appropriate trace event. It makes use of the other | |
1273 | * event_command callback functions to orchestrate this, and is | |
1274 | * usually implemented by the generic utility function | |
1275 | * @event_trigger_callback() (see trace_event_triggers.c). | |
1276 | * | |
1277 | * @reg: Adds the trigger to the list of triggers associated with the | |
1278 | * event, and enables the event trigger itself, after | |
1279 | * initializing it (via the event_trigger_ops @init() function). | |
1280 | * This is also where commands can use the @trigger_type value to | |
1281 | * make the decision as to whether or not multiple instances of | |
1282 | * the trigger should be allowed. This is usually implemented by | |
1283 | * the generic utility function @register_trigger() (see | |
1284 | * trace_event_triggers.c). | |
1285 | * | |
1286 | * @unreg: Removes the trigger from the list of triggers associated | |
1287 | * with the event, and disables the event trigger itself, after | |
1288 | * initializing it (via the event_trigger_ops @free() function). | |
1289 | * This is usually implemented by the generic utility function | |
1290 | * @unregister_trigger() (see trace_event_triggers.c). | |
1291 | * | |
1292 | * @set_filter: An optional function called to parse and set a filter | |
1293 | * for the trigger. If no @set_filter() method is set for the | |
1294 | * event command, filters set by the user for the command will be | |
1295 | * ignored. This is usually implemented by the generic utility | |
1296 | * function @set_trigger_filter() (see trace_event_triggers.c). | |
1297 | * | |
1298 | * @get_trigger_ops: The callback function invoked to retrieve the | |
1299 | * event_trigger_ops implementation associated with the command. | |
1300 | */ | |
1301 | struct event_command { | |
1302 | struct list_head list; | |
1303 | char *name; | |
1304 | enum event_trigger_type trigger_type; | |
1305 | bool post_trigger; | |
1306 | int (*func)(struct event_command *cmd_ops, | |
7f1d2f82 | 1307 | struct trace_event_file *file, |
85f2b082 TZ |
1308 | char *glob, char *cmd, char *params); |
1309 | int (*reg)(char *glob, | |
1310 | struct event_trigger_ops *ops, | |
1311 | struct event_trigger_data *data, | |
7f1d2f82 | 1312 | struct trace_event_file *file); |
85f2b082 TZ |
1313 | void (*unreg)(char *glob, |
1314 | struct event_trigger_ops *ops, | |
1315 | struct event_trigger_data *data, | |
7f1d2f82 | 1316 | struct trace_event_file *file); |
85f2b082 TZ |
1317 | int (*set_filter)(char *filter_str, |
1318 | struct event_trigger_data *data, | |
7f1d2f82 | 1319 | struct trace_event_file *file); |
85f2b082 TZ |
1320 | struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); |
1321 | }; | |
1322 | ||
7f1d2f82 | 1323 | extern int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 | 1324 | int enable, int soft_disable); |
93e31ffb | 1325 | extern int tracing_alloc_snapshot(void); |
85f2b082 | 1326 | |
e9fb2b6d SR |
1327 | extern const char *__start___trace_bprintk_fmt[]; |
1328 | extern const char *__stop___trace_bprintk_fmt[]; | |
1329 | ||
102c9323 SRRH |
1330 | extern const char *__start___tracepoint_str[]; |
1331 | extern const char *__stop___tracepoint_str[]; | |
1332 | ||
b9f9108c | 1333 | void trace_printk_control(bool enabled); |
07d777fe | 1334 | void trace_printk_init_buffers(void); |
81698831 | 1335 | void trace_printk_start_comm(void); |
613f04a0 | 1336 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); |
2b6080f2 | 1337 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); |
07d777fe | 1338 | |
ca268da6 SRRH |
1339 | /* |
1340 | * Normal trace_printk() and friends allocates special buffers | |
1341 | * to do the manipulation, as well as saves the print formats | |
1342 | * into sections to display. But the trace infrastructure wants | |
1343 | * to use these without the added overhead at the price of being | |
1344 | * a bit slower (used mainly for warnings, where we don't care | |
1345 | * about performance). The internal_trace_puts() is for such | |
1346 | * a purpose. | |
1347 | */ | |
1348 | #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) | |
1349 | ||
4e5292ea | 1350 | #undef FTRACE_ENTRY |
02aa3162 | 1351 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ |
2425bcb9 | 1352 | extern struct trace_event_call \ |
52f5684c | 1353 | __aligned(4) event_##call; |
4e5292ea | 1354 | #undef FTRACE_ENTRY_DUP |
02aa3162 JO |
1355 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ |
1356 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
1357 | filter) | |
4e5292ea | 1358 | #include "trace_entries.h" |
e1112b4d | 1359 | |
6e48b550 | 1360 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) |
2425bcb9 | 1361 | int perf_ftrace_event_register(struct trace_event_call *call, |
ced39002 JO |
1362 | enum trace_reg type, void *data); |
1363 | #else | |
1364 | #define perf_ftrace_event_register NULL | |
6e48b550 | 1365 | #endif |
ced39002 | 1366 | |
5f893b26 SRRH |
1367 | #ifdef CONFIG_FTRACE_SYSCALLS |
1368 | void init_ftrace_syscalls(void); | |
1369 | #else | |
1370 | static inline void init_ftrace_syscalls(void) { } | |
1371 | #endif | |
1372 | ||
1373 | #ifdef CONFIG_EVENT_TRACING | |
1374 | void trace_event_init(void); | |
0c564a53 | 1375 | void trace_event_enum_update(struct trace_enum_map **map, int len); |
5f893b26 SRRH |
1376 | #else |
1377 | static inline void __init trace_event_init(void) { } | |
cc9e4bde | 1378 | static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { } |
5f893b26 SRRH |
1379 | #endif |
1380 | ||
0daa2302 | 1381 | extern struct trace_iterator *tracepoint_print_iter; |
5f893b26 | 1382 | |
bc0c38d1 | 1383 | #endif /* _LINUX_KERNEL_TRACE_H */ |