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> |
97f20251 | 15 | #include <linux/ftrace_event.h> |
9504504c | 16 | |
12ab74ee SR |
17 | #ifdef CONFIG_FTRACE_SYSCALLS |
18 | #include <asm/unistd.h> /* For NR_SYSCALLS */ | |
19 | #include <asm/syscall.h> /* some archs define it here */ | |
20 | #endif | |
21 | ||
72829bc3 TG |
22 | enum trace_type { |
23 | __TRACE_FIRST_TYPE = 0, | |
24 | ||
25 | TRACE_FN, | |
26 | TRACE_CTX, | |
27 | TRACE_WAKE, | |
28 | TRACE_STACK, | |
dd0e545f | 29 | TRACE_PRINT, |
48ead020 | 30 | TRACE_BPRINT, |
bd8ac686 PP |
31 | TRACE_MMIO_RW, |
32 | TRACE_MMIO_MAP, | |
9f029e83 | 33 | TRACE_BRANCH, |
287b6e68 FW |
34 | TRACE_GRAPH_RET, |
35 | TRACE_GRAPH_ENT, | |
02b67518 | 36 | TRACE_USER_STACK, |
c71a8961 | 37 | TRACE_BLK, |
09ae7234 | 38 | TRACE_BPUTS, |
72829bc3 | 39 | |
f0868d1e | 40 | __TRACE_LAST_TYPE, |
72829bc3 TG |
41 | }; |
42 | ||
bc0c38d1 | 43 | |
0a1c49db SR |
44 | #undef __field |
45 | #define __field(type, item) type item; | |
86387f7e | 46 | |
d7315094 SR |
47 | #undef __field_struct |
48 | #define __field_struct(type, item) __field(type, item) | |
86387f7e | 49 | |
d7315094 SR |
50 | #undef __field_desc |
51 | #define __field_desc(type, container, item) | |
02b67518 | 52 | |
0a1c49db SR |
53 | #undef __array |
54 | #define __array(type, item, size) type item[size]; | |
1427cdf0 | 55 | |
d7315094 SR |
56 | #undef __array_desc |
57 | #define __array_desc(type, container, item, size) | |
777e208d | 58 | |
0a1c49db SR |
59 | #undef __dynamic_array |
60 | #define __dynamic_array(type, item) type item[]; | |
777e208d | 61 | |
0a1c49db SR |
62 | #undef F_STRUCT |
63 | #define F_STRUCT(args...) args | |
74239072 | 64 | |
0a1c49db | 65 | #undef FTRACE_ENTRY |
02aa3162 JO |
66 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
67 | struct struct_name { \ | |
68 | struct trace_entry ent; \ | |
69 | tstruct \ | |
0a1c49db | 70 | } |
777e208d | 71 | |
0a1c49db SR |
72 | #undef TP_ARGS |
73 | #define TP_ARGS(args...) args | |
52f232cb | 74 | |
0a1c49db | 75 | #undef FTRACE_ENTRY_DUP |
02aa3162 | 76 | #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) |
1e9b51c2 | 77 | |
e59a0bff | 78 | #undef FTRACE_ENTRY_REG |
02aa3162 JO |
79 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ |
80 | filter, regfn) \ | |
81 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
82 | filter) | |
e59a0bff | 83 | |
0a1c49db | 84 | #include "trace_entries.h" |
36994e58 | 85 | |
0a1c49db SR |
86 | /* |
87 | * syscalls are special, and need special handling, this is why | |
88 | * they are not included in trace_entries.h | |
89 | */ | |
bed1ffca FW |
90 | struct syscall_trace_enter { |
91 | struct trace_entry ent; | |
92 | int nr; | |
93 | unsigned long args[]; | |
94 | }; | |
95 | ||
96 | struct syscall_trace_exit { | |
97 | struct trace_entry ent; | |
98 | int nr; | |
99df5a6a | 99 | long ret; |
bed1ffca FW |
100 | }; |
101 | ||
93ccae7a | 102 | struct kprobe_trace_entry_head { |
413d37d1 MH |
103 | struct trace_entry ent; |
104 | unsigned long ip; | |
413d37d1 MH |
105 | }; |
106 | ||
93ccae7a | 107 | struct kretprobe_trace_entry_head { |
413d37d1 MH |
108 | struct trace_entry ent; |
109 | unsigned long func; | |
110 | unsigned long ret_ip; | |
413d37d1 MH |
111 | }; |
112 | ||
fc5e27ae PP |
113 | /* |
114 | * trace_flag_type is an enumeration that holds different | |
115 | * states when a trace occurs. These are: | |
9244489a | 116 | * IRQS_OFF - interrupts were disabled |
9de36825 | 117 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
bd9cfca9 | 118 | * NEED_RESCHED - reschedule is requested |
9244489a SR |
119 | * HARDIRQ - inside an interrupt handler |
120 | * SOFTIRQ - inside a softirq handler | |
fc5e27ae PP |
121 | */ |
122 | enum trace_flag_type { | |
123 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
124 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
125 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
126 | TRACE_FLAG_HARDIRQ = 0x08, | |
127 | TRACE_FLAG_SOFTIRQ = 0x10, | |
e5137b50 | 128 | TRACE_FLAG_PREEMPT_RESCHED = 0x20, |
fc5e27ae PP |
129 | }; |
130 | ||
5bf9a1ee | 131 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 | 132 | |
2b6080f2 SR |
133 | struct trace_array; |
134 | ||
bc0c38d1 SR |
135 | /* |
136 | * The CPU trace array - it consists of thousands of trace entries | |
137 | * plus some other descriptor data: (for example which task started | |
138 | * the trace, etc.) | |
139 | */ | |
140 | struct trace_array_cpu { | |
bc0c38d1 | 141 | atomic_t disabled; |
2cadf913 | 142 | void *buffer_page; /* ring buffer spare */ |
4e3c3333 | 143 | |
438ced17 | 144 | unsigned long entries; |
bc0c38d1 SR |
145 | unsigned long saved_latency; |
146 | unsigned long critical_start; | |
147 | unsigned long critical_end; | |
148 | unsigned long critical_sequence; | |
149 | unsigned long nice; | |
150 | unsigned long policy; | |
151 | unsigned long rt_priority; | |
2f26ebd5 | 152 | unsigned long skipped_entries; |
bc0c38d1 SR |
153 | cycle_t preempt_timestamp; |
154 | pid_t pid; | |
d20b92ab | 155 | kuid_t uid; |
bc0c38d1 SR |
156 | char comm[TASK_COMM_LEN]; |
157 | }; | |
158 | ||
2b6080f2 SR |
159 | struct tracer; |
160 | ||
12883efb SRRH |
161 | struct trace_buffer { |
162 | struct trace_array *tr; | |
163 | struct ring_buffer *buffer; | |
164 | struct trace_array_cpu __percpu *data; | |
165 | cycle_t time_start; | |
166 | int cpu; | |
167 | }; | |
168 | ||
bc0c38d1 SR |
169 | /* |
170 | * The trace array - an array of per-CPU trace arrays. This is the | |
171 | * highest level data structure that individual tracers deal with. | |
172 | * They have on/off state as well: | |
173 | */ | |
174 | struct trace_array { | |
ae63b31e | 175 | struct list_head list; |
277ba044 | 176 | char *name; |
12883efb SRRH |
177 | struct trace_buffer trace_buffer; |
178 | #ifdef CONFIG_TRACER_MAX_TRACE | |
179 | /* | |
180 | * The max_buffer is used to snapshot the trace when a maximum | |
181 | * latency is reached, or when the user initiates a snapshot. | |
182 | * Some tracers will use this to store a maximum trace while | |
183 | * it continues examining live traces. | |
184 | * | |
185 | * The buffers for the max_buffer are set up the same as the trace_buffer | |
186 | * When a snapshot is taken, the buffer of the max_buffer is swapped | |
187 | * with the buffer of the trace_buffer and the buffers are reset for | |
188 | * the trace_buffer so the tracing can continue. | |
189 | */ | |
190 | struct trace_buffer max_buffer; | |
45ad21ca | 191 | bool allocated_snapshot; |
12883efb | 192 | #endif |
499e5470 | 193 | int buffer_disabled; |
12ab74ee SR |
194 | #ifdef CONFIG_FTRACE_SYSCALLS |
195 | int sys_refcount_enter; | |
196 | int sys_refcount_exit; | |
3a81a521 SRRH |
197 | struct ftrace_event_file __rcu *enter_syscall_files[NR_syscalls]; |
198 | struct ftrace_event_file __rcu *exit_syscall_files[NR_syscalls]; | |
12ab74ee | 199 | #endif |
2b6080f2 SR |
200 | int stop_count; |
201 | int clock_id; | |
202 | struct tracer *current_trace; | |
ae63b31e | 203 | unsigned int flags; |
2b6080f2 | 204 | raw_spinlock_t start_lock; |
ae63b31e | 205 | struct dentry *dir; |
2b6080f2 SR |
206 | struct dentry *options; |
207 | struct dentry *percpu_dir; | |
ae63b31e SR |
208 | struct dentry *event_dir; |
209 | struct list_head systems; | |
210 | struct list_head events; | |
ccfe9e42 | 211 | cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
a695cb58 | 212 | int ref; |
f20a5806 SRRH |
213 | #ifdef CONFIG_FUNCTION_TRACER |
214 | struct ftrace_ops *ops; | |
215 | /* function tracing enabled */ | |
216 | int function_enabled; | |
217 | #endif | |
bc0c38d1 SR |
218 | }; |
219 | ||
ae63b31e SR |
220 | enum { |
221 | TRACE_ARRAY_FL_GLOBAL = (1 << 0) | |
222 | }; | |
223 | ||
224 | extern struct list_head ftrace_trace_arrays; | |
225 | ||
a8227415 AL |
226 | extern struct mutex trace_types_lock; |
227 | ||
8e2e2fa4 SRRH |
228 | extern int trace_array_get(struct trace_array *tr); |
229 | extern void trace_array_put(struct trace_array *tr); | |
230 | ||
ae63b31e SR |
231 | /* |
232 | * The global tracer (top) should be the first trace array added, | |
233 | * but we check the flag anyway. | |
234 | */ | |
235 | static inline struct trace_array *top_trace_array(void) | |
236 | { | |
237 | struct trace_array *tr; | |
238 | ||
239 | tr = list_entry(ftrace_trace_arrays.prev, | |
240 | typeof(*tr), list); | |
241 | WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); | |
242 | return tr; | |
243 | } | |
244 | ||
7104f300 SR |
245 | #define FTRACE_CMP_TYPE(var, type) \ |
246 | __builtin_types_compatible_p(typeof(var), type *) | |
247 | ||
248 | #undef IF_ASSIGN | |
249 | #define IF_ASSIGN(var, entry, etype, id) \ | |
250 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
251 | var = (typeof(var))(entry); \ | |
252 | WARN_ON(id && (entry)->type != id); \ | |
253 | break; \ | |
254 | } | |
255 | ||
256 | /* Will cause compile errors if type is not found. */ | |
257 | extern void __ftrace_bad_type(void); | |
258 | ||
259 | /* | |
260 | * The trace_assign_type is a verifier that the entry type is | |
261 | * the same as the type being assigned. To add new types simply | |
262 | * add a line with the following format: | |
263 | * | |
264 | * IF_ASSIGN(var, ent, type, id); | |
265 | * | |
266 | * Where "type" is the trace type that includes the trace_entry | |
267 | * as the "ent" item. And "id" is the trace identifier that is | |
268 | * used in the trace_type enum. | |
269 | * | |
270 | * If the type can have more than one id, then use zero. | |
271 | */ | |
272 | #define trace_assign_type(var, ent) \ | |
273 | do { \ | |
274 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
275 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 276 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 277 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 278 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 279 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
09ae7234 | 280 | IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ |
7104f300 SR |
281 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
282 | TRACE_MMIO_RW); \ | |
283 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
284 | TRACE_MMIO_MAP); \ | |
9f029e83 | 285 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
286 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
287 | TRACE_GRAPH_ENT); \ | |
288 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
289 | TRACE_GRAPH_RET); \ | |
7104f300 SR |
290 | __ftrace_bad_type(); \ |
291 | } while (0) | |
2c4f035f | 292 | |
adf9f195 FW |
293 | /* |
294 | * An option specific to a tracer. This is a boolean value. | |
295 | * The bit is the bit index that sets its value on the | |
296 | * flags value in struct tracer_flags. | |
297 | */ | |
298 | struct tracer_opt { | |
9de36825 IM |
299 | const char *name; /* Will appear on the trace_options file */ |
300 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
301 | }; |
302 | ||
303 | /* | |
304 | * The set of specific options for a tracer. Your tracer | |
305 | * have to set the initial value of the flags val. | |
306 | */ | |
307 | struct tracer_flags { | |
308 | u32 val; | |
9de36825 | 309 | struct tracer_opt *opts; |
adf9f195 FW |
310 | }; |
311 | ||
312 | /* Makes more easy to define a tracer opt */ | |
313 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
314 | ||
034939b6 | 315 | |
6eaaa5d5 FW |
316 | /** |
317 | * struct tracer - a specific tracer and its callbacks to interact with debugfs | |
318 | * @name: the name chosen to select it on the available_tracers file | |
319 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
320 | * @reset: called when one switches to another tracer | |
321 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled) | |
322 | * @stop: called when tracing is paused (echo 0 > tracing_enabled) | |
323 | * @open: called when the trace file is opened | |
324 | * @pipe_open: called when the trace_pipe file is opened | |
325 | * @wait_pipe: override how the user waits for traces on trace_pipe | |
326 | * @close: called when the trace file is released | |
c521efd1 | 327 | * @pipe_close: called when the trace_pipe file is released |
6eaaa5d5 FW |
328 | * @read: override the default read callback on trace_pipe |
329 | * @splice_read: override the default splice_read callback on trace_pipe | |
330 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
331 | * @print_headers: override the first lines that describe your columns | |
332 | * @print_line: callback that prints a trace | |
333 | * @set_flag: signals one of your private flags changed (trace_options file) | |
334 | * @flags: your private flags | |
bc0c38d1 SR |
335 | */ |
336 | struct tracer { | |
337 | const char *name; | |
1c80025a | 338 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 339 | void (*reset)(struct trace_array *tr); |
9036990d SR |
340 | void (*start)(struct trace_array *tr); |
341 | void (*stop)(struct trace_array *tr); | |
bc0c38d1 | 342 | void (*open)(struct trace_iterator *iter); |
107bad8b | 343 | void (*pipe_open)(struct trace_iterator *iter); |
6eaaa5d5 | 344 | void (*wait_pipe)(struct trace_iterator *iter); |
bc0c38d1 | 345 | void (*close)(struct trace_iterator *iter); |
c521efd1 | 346 | void (*pipe_close)(struct trace_iterator *iter); |
107bad8b SR |
347 | ssize_t (*read)(struct trace_iterator *iter, |
348 | struct file *filp, char __user *ubuf, | |
349 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
350 | ssize_t (*splice_read)(struct trace_iterator *iter, |
351 | struct file *filp, | |
352 | loff_t *ppos, | |
353 | struct pipe_inode_info *pipe, | |
354 | size_t len, | |
355 | unsigned int flags); | |
60a11774 SR |
356 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
357 | int (*selftest)(struct tracer *trace, | |
358 | struct trace_array *tr); | |
359 | #endif | |
8bba1bf5 | 360 | void (*print_header)(struct seq_file *m); |
2c4f035f | 361 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 | 362 | /* If you handled the flag setting, return 0 */ |
8c1a49ae SRRH |
363 | int (*set_flag)(struct trace_array *tr, |
364 | u32 old_flags, u32 bit, int set); | |
613f04a0 | 365 | /* Return 0 if OK with change, else return non-zero */ |
bf6065b5 | 366 | int (*flag_changed)(struct trace_array *tr, |
613f04a0 | 367 | u32 mask, int set); |
bc0c38d1 | 368 | struct tracer *next; |
9de36825 | 369 | struct tracer_flags *flags; |
50512ab5 | 370 | int enabled; |
f43c738b | 371 | bool print_max; |
607e2ea1 | 372 | bool allow_instances; |
12883efb | 373 | #ifdef CONFIG_TRACER_MAX_TRACE |
f43c738b | 374 | bool use_max_tr; |
12883efb | 375 | #endif |
bc0c38d1 SR |
376 | }; |
377 | ||
f9520750 | 378 | |
e4a3f541 | 379 | /* Only current can touch trace_recursion */ |
e4a3f541 | 380 | |
edc15caf SR |
381 | /* |
382 | * For function tracing recursion: | |
383 | * The order of these bits are important. | |
384 | * | |
385 | * When function tracing occurs, the following steps are made: | |
386 | * If arch does not support a ftrace feature: | |
387 | * call internal function (uses INTERNAL bits) which calls... | |
388 | * If callback is registered to the "global" list, the list | |
389 | * function is called and recursion checks the GLOBAL bits. | |
390 | * then this function calls... | |
391 | * The function callback, which can use the FTRACE bits to | |
392 | * check for recursion. | |
393 | * | |
394 | * Now if the arch does not suppport a feature, and it calls | |
395 | * the global list function which calls the ftrace callback | |
396 | * all three of these steps will do a recursion protection. | |
397 | * There's no reason to do one if the previous caller already | |
398 | * did. The recursion that we are protecting against will | |
399 | * go through the same steps again. | |
400 | * | |
401 | * To prevent the multiple recursion checks, if a recursion | |
402 | * bit is set that is higher than the MAX bit of the current | |
403 | * check, then we know that the check was made by the previous | |
404 | * caller, and we can skip the current check. | |
405 | */ | |
e46cbf75 | 406 | enum { |
567cd4da SR |
407 | TRACE_BUFFER_BIT, |
408 | TRACE_BUFFER_NMI_BIT, | |
409 | TRACE_BUFFER_IRQ_BIT, | |
410 | TRACE_BUFFER_SIRQ_BIT, | |
411 | ||
412 | /* Start of function recursion bits */ | |
413 | TRACE_FTRACE_BIT, | |
edc15caf SR |
414 | TRACE_FTRACE_NMI_BIT, |
415 | TRACE_FTRACE_IRQ_BIT, | |
416 | TRACE_FTRACE_SIRQ_BIT, | |
e46cbf75 | 417 | |
edc15caf | 418 | /* GLOBAL_BITs must be greater than FTRACE_BITs */ |
e46cbf75 SR |
419 | TRACE_GLOBAL_BIT, |
420 | TRACE_GLOBAL_NMI_BIT, | |
421 | TRACE_GLOBAL_IRQ_BIT, | |
422 | TRACE_GLOBAL_SIRQ_BIT, | |
423 | ||
edc15caf SR |
424 | /* INTERNAL_BITs must be greater than GLOBAL_BITs */ |
425 | TRACE_INTERNAL_BIT, | |
426 | TRACE_INTERNAL_NMI_BIT, | |
427 | TRACE_INTERNAL_IRQ_BIT, | |
428 | TRACE_INTERNAL_SIRQ_BIT, | |
429 | ||
e46cbf75 | 430 | TRACE_CONTROL_BIT, |
e248491a | 431 | |
e4a3f541 SR |
432 | /* |
433 | * Abuse of the trace_recursion. | |
434 | * As we need a way to maintain state if we are tracing the function | |
435 | * graph in irq because we want to trace a particular function that | |
436 | * was called in irq context but we have irq tracing off. Since this | |
437 | * can only be modified by current, we can reuse trace_recursion. | |
438 | */ | |
e46cbf75 SR |
439 | TRACE_IRQ_BIT, |
440 | }; | |
e4a3f541 | 441 | |
e46cbf75 SR |
442 | #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) |
443 | #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) | |
444 | #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) | |
e4a3f541 | 445 | |
edc15caf SR |
446 | #define TRACE_CONTEXT_BITS 4 |
447 | ||
448 | #define TRACE_FTRACE_START TRACE_FTRACE_BIT | |
449 | #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) | |
450 | ||
451 | #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT | |
452 | #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1) | |
453 | ||
454 | #define TRACE_LIST_START TRACE_INTERNAL_BIT | |
455 | #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) | |
456 | ||
457 | #define TRACE_CONTEXT_MASK TRACE_LIST_MAX | |
458 | ||
459 | static __always_inline int trace_get_context_bit(void) | |
460 | { | |
461 | int bit; | |
462 | ||
463 | if (in_interrupt()) { | |
464 | if (in_nmi()) | |
465 | bit = 0; | |
466 | ||
467 | else if (in_irq()) | |
468 | bit = 1; | |
469 | else | |
470 | bit = 2; | |
471 | } else | |
472 | bit = 3; | |
473 | ||
474 | return bit; | |
475 | } | |
476 | ||
477 | static __always_inline int trace_test_and_set_recursion(int start, int max) | |
478 | { | |
479 | unsigned int val = current->trace_recursion; | |
480 | int bit; | |
481 | ||
482 | /* A previous recursion check was made */ | |
483 | if ((val & TRACE_CONTEXT_MASK) > max) | |
484 | return 0; | |
485 | ||
486 | bit = trace_get_context_bit() + start; | |
487 | if (unlikely(val & (1 << bit))) | |
488 | return -1; | |
489 | ||
490 | val |= 1 << bit; | |
491 | current->trace_recursion = val; | |
492 | barrier(); | |
493 | ||
494 | return bit; | |
495 | } | |
496 | ||
497 | static __always_inline void trace_clear_recursion(int bit) | |
498 | { | |
499 | unsigned int val = current->trace_recursion; | |
500 | ||
501 | if (!bit) | |
502 | return; | |
503 | ||
504 | bit = 1 << bit; | |
505 | val &= ~bit; | |
506 | ||
507 | barrier(); | |
508 | current->trace_recursion = val; | |
509 | } | |
510 | ||
6d158a81 SR |
511 | static inline struct ring_buffer_iter * |
512 | trace_buffer_iter(struct trace_iterator *iter, int cpu) | |
513 | { | |
514 | if (iter->buffer_iter && iter->buffer_iter[cpu]) | |
515 | return iter->buffer_iter[cpu]; | |
516 | return NULL; | |
517 | } | |
518 | ||
b6f11df2 | 519 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 520 | int tracing_is_enabled(void); |
12883efb SRRH |
521 | void tracing_reset(struct trace_buffer *buf, int cpu); |
522 | void tracing_reset_online_cpus(struct trace_buffer *buf); | |
9456f0fa | 523 | void tracing_reset_current(int cpu); |
873c642f | 524 | void tracing_reset_all_online_cpus(void); |
bc0c38d1 | 525 | int tracing_open_generic(struct inode *inode, struct file *filp); |
2e86421d | 526 | bool tracing_is_disabled(void); |
5452af66 | 527 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 528 | umode_t mode, |
5452af66 FW |
529 | struct dentry *parent, |
530 | void *data, | |
531 | const struct file_operations *fops); | |
532 | ||
2b6080f2 | 533 | struct dentry *tracing_init_dentry_tr(struct trace_array *tr); |
bc0c38d1 | 534 | struct dentry *tracing_init_dentry(void); |
d618b3e6 | 535 | |
51a763dd ACM |
536 | struct ring_buffer_event; |
537 | ||
e77405ad SR |
538 | struct ring_buffer_event * |
539 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
540 | int type, | |
541 | unsigned long len, | |
542 | unsigned long flags, | |
543 | int pc); | |
51a763dd | 544 | |
45dcd8b8 PP |
545 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
546 | struct trace_array_cpu *data); | |
c4a8e8be FW |
547 | |
548 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
549 | int *ent_cpu, u64 *ent_ts); | |
550 | ||
7ffbd48d SR |
551 | void __buffer_unlock_commit(struct ring_buffer *buffer, |
552 | struct ring_buffer_event *event); | |
553 | ||
955b61e5 JW |
554 | int trace_empty(struct trace_iterator *iter); |
555 | ||
556 | void *trace_find_next_entry_inc(struct trace_iterator *iter); | |
557 | ||
558 | void trace_init_global_iter(struct trace_iterator *iter); | |
559 | ||
560 | void tracing_iter_reset(struct trace_iterator *iter, int cpu); | |
561 | ||
6eaaa5d5 FW |
562 | void poll_wait_pipe(struct trace_iterator *iter); |
563 | ||
bc0c38d1 | 564 | void tracing_sched_switch_trace(struct trace_array *tr, |
bc0c38d1 SR |
565 | struct task_struct *prev, |
566 | struct task_struct *next, | |
38697053 | 567 | unsigned long flags, int pc); |
57422797 IM |
568 | |
569 | void tracing_sched_wakeup_trace(struct trace_array *tr, | |
57422797 IM |
570 | struct task_struct *wakee, |
571 | struct task_struct *cur, | |
38697053 | 572 | unsigned long flags, int pc); |
6fb44b71 | 573 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
574 | unsigned long ip, |
575 | unsigned long parent_ip, | |
38697053 | 576 | unsigned long flags, int pc); |
0a772620 JO |
577 | void trace_graph_function(struct trace_array *tr, |
578 | unsigned long ip, | |
579 | unsigned long parent_ip, | |
580 | unsigned long flags, int pc); | |
7e9a49ef | 581 | void trace_latency_header(struct seq_file *m); |
62b915f1 JO |
582 | void trace_default_header(struct seq_file *m); |
583 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter); | |
584 | int trace_empty(struct trace_iterator *iter); | |
bc0c38d1 | 585 | |
287b6e68 | 586 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 587 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1a0799a8 | 588 | void set_graph_array(struct trace_array *tr); |
1e9b51c2 | 589 | |
41bc8144 SR |
590 | void tracing_start_cmdline_record(void); |
591 | void tracing_stop_cmdline_record(void); | |
e168e051 SR |
592 | void tracing_sched_switch_assign_trace(struct trace_array *tr); |
593 | void tracing_stop_sched_switch_record(void); | |
594 | void tracing_start_sched_switch_record(void); | |
bc0c38d1 | 595 | int register_tracer(struct tracer *type); |
b5130b1e | 596 | int is_tracing_stopped(void); |
955b61e5 | 597 | |
098c879e SRRH |
598 | loff_t tracing_lseek(struct file *file, loff_t offset, int whence); |
599 | ||
955b61e5 JW |
600 | extern cpumask_var_t __read_mostly tracing_buffer_mask; |
601 | ||
602 | #define for_each_tracing_cpu(cpu) \ | |
603 | for_each_cpu(cpu, tracing_buffer_mask) | |
bc0c38d1 SR |
604 | |
605 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
606 | ||
0e950173 TB |
607 | extern unsigned long tracing_thresh; |
608 | ||
5d4a9dba | 609 | #ifdef CONFIG_TRACER_MAX_TRACE |
bc0c38d1 | 610 | extern unsigned long tracing_max_latency; |
bc0c38d1 SR |
611 | |
612 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); | |
613 | void update_max_tr_single(struct trace_array *tr, | |
614 | struct task_struct *tsk, int cpu); | |
5d4a9dba | 615 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 616 | |
c0a0d0d3 | 617 | #ifdef CONFIG_STACKTRACE |
e77405ad | 618 | void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
619 | int skip, int pc); |
620 | ||
1fd8df2c MH |
621 | void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, |
622 | int skip, int pc, struct pt_regs *regs); | |
623 | ||
e77405ad | 624 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
625 | int pc); |
626 | ||
627 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, | |
628 | int pc); | |
629 | #else | |
e1f7992e | 630 | static inline void ftrace_trace_stack(struct ring_buffer *buffer, |
c0a0d0d3 FW |
631 | unsigned long flags, int skip, int pc) |
632 | { | |
633 | } | |
634 | ||
1fd8df2c MH |
635 | static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, |
636 | unsigned long flags, int skip, | |
637 | int pc, struct pt_regs *regs) | |
638 | { | |
639 | } | |
640 | ||
e1f7992e | 641 | static inline void ftrace_trace_userstack(struct ring_buffer *buffer, |
c0a0d0d3 FW |
642 | unsigned long flags, int pc) |
643 | { | |
644 | } | |
645 | ||
646 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags, | |
647 | int skip, int pc) | |
648 | { | |
649 | } | |
650 | #endif /* CONFIG_STACKTRACE */ | |
53614991 | 651 | |
e309b41d | 652 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 653 | |
4ca53085 | 654 | extern void trace_find_cmdline(int pid, char comm[]); |
f7d48cbd | 655 | |
bc0c38d1 SR |
656 | #ifdef CONFIG_DYNAMIC_FTRACE |
657 | extern unsigned long ftrace_update_tot_cnt; | |
ad97772a | 658 | #endif |
d05cdb25 SR |
659 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
660 | extern int DYN_FTRACE_TEST_NAME(void); | |
95950c2e SR |
661 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 |
662 | extern int DYN_FTRACE_TEST_NAME2(void); | |
bc0c38d1 | 663 | |
55034cd6 | 664 | extern bool ring_buffer_expanded; |
020e5f85 | 665 | extern bool tracing_selftest_disabled; |
9288f99a | 666 | DECLARE_PER_CPU(int, ftrace_cpu_disabled); |
020e5f85 | 667 | |
60a11774 | 668 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
669 | extern int trace_selftest_startup_function(struct tracer *trace, |
670 | struct trace_array *tr); | |
7447dce9 FW |
671 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
672 | struct trace_array *tr); | |
60a11774 SR |
673 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
674 | struct trace_array *tr); | |
60a11774 SR |
675 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
676 | struct trace_array *tr); | |
60a11774 SR |
677 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
678 | struct trace_array *tr); | |
60a11774 SR |
679 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
680 | struct trace_array *tr); | |
fb1b6d8b SN |
681 | extern int trace_selftest_startup_nop(struct tracer *trace, |
682 | struct trace_array *tr); | |
60a11774 SR |
683 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
684 | struct trace_array *tr); | |
80e5ea45 SR |
685 | extern int trace_selftest_startup_branch(struct tracer *trace, |
686 | struct trace_array *tr); | |
8f768993 SRRH |
687 | /* |
688 | * Tracer data references selftest functions that only occur | |
689 | * on boot up. These can be __init functions. Thus, when selftests | |
690 | * are enabled, then the tracers need to reference __init functions. | |
691 | */ | |
692 | #define __tracer_data __refdata | |
693 | #else | |
694 | /* Tracers are seldom changed. Optimize when selftests are disabled. */ | |
695 | #define __tracer_data __read_mostly | |
60a11774 SR |
696 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
697 | ||
c7aafc54 | 698 | extern void *head_page(struct trace_array_cpu *data); |
cf8e3474 | 699 | extern unsigned long long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 700 | extern int |
40ce74f1 | 701 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 702 | extern int |
40ce74f1 | 703 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
659372d3 SR |
704 | extern int |
705 | trace_array_vprintk(struct trace_array *tr, | |
706 | unsigned long ip, const char *fmt, va_list args); | |
707 | int trace_array_printk(struct trace_array *tr, | |
708 | unsigned long ip, const char *fmt, ...); | |
12883efb SRRH |
709 | int trace_array_printk_buf(struct ring_buffer *buffer, |
710 | unsigned long ip, const char *fmt, ...); | |
955b61e5 JW |
711 | void trace_printk_seq(struct trace_seq *s); |
712 | enum print_line_t print_trace_line(struct trace_iterator *iter); | |
c7aafc54 | 713 | |
4e655519 IM |
714 | extern unsigned long trace_flags; |
715 | ||
15e6cb36 | 716 | /* Standard output formatting function used for function return traces */ |
fb52607a | 717 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
62b915f1 JO |
718 | |
719 | /* Flag options */ | |
720 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1 | |
721 | #define TRACE_GRAPH_PRINT_CPU 0x2 | |
722 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 | |
723 | #define TRACE_GRAPH_PRINT_PROC 0x8 | |
724 | #define TRACE_GRAPH_PRINT_DURATION 0x10 | |
725 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 | |
6fc84ea7 SRRH |
726 | #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 |
727 | #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) | |
62b915f1 | 728 | |
d7a8d9e9 JO |
729 | extern enum print_line_t |
730 | print_graph_function_flags(struct trace_iterator *iter, u32 flags); | |
731 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags); | |
0706f1c4 SR |
732 | extern enum print_line_t |
733 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); | |
62b915f1 JO |
734 | extern void graph_trace_open(struct trace_iterator *iter); |
735 | extern void graph_trace_close(struct trace_iterator *iter); | |
736 | extern int __trace_graph_entry(struct trace_array *tr, | |
737 | struct ftrace_graph_ent *trace, | |
738 | unsigned long flags, int pc); | |
739 | extern void __trace_graph_return(struct trace_array *tr, | |
740 | struct ftrace_graph_ret *trace, | |
741 | unsigned long flags, int pc); | |
742 | ||
ea4e2bc4 SR |
743 | |
744 | #ifdef CONFIG_DYNAMIC_FTRACE | |
745 | /* TODO: make this variable */ | |
746 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
747 | extern int ftrace_graph_count; | |
748 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
29ad23b0 NK |
749 | extern int ftrace_graph_notrace_count; |
750 | extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
ea4e2bc4 SR |
751 | |
752 | static inline int ftrace_graph_addr(unsigned long addr) | |
753 | { | |
754 | int i; | |
755 | ||
9aa72b4b | 756 | if (!ftrace_graph_count) |
ea4e2bc4 SR |
757 | return 1; |
758 | ||
759 | for (i = 0; i < ftrace_graph_count; i++) { | |
e4a3f541 SR |
760 | if (addr == ftrace_graph_funcs[i]) { |
761 | /* | |
762 | * If no irqs are to be traced, but a set_graph_function | |
763 | * is set, and called by an interrupt handler, we still | |
764 | * want to trace it. | |
765 | */ | |
766 | if (in_irq()) | |
767 | trace_recursion_set(TRACE_IRQ_BIT); | |
768 | else | |
769 | trace_recursion_clear(TRACE_IRQ_BIT); | |
ea4e2bc4 | 770 | return 1; |
e4a3f541 | 771 | } |
ea4e2bc4 SR |
772 | } |
773 | ||
774 | return 0; | |
775 | } | |
29ad23b0 NK |
776 | |
777 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
778 | { | |
779 | int i; | |
780 | ||
781 | if (!ftrace_graph_notrace_count) | |
782 | return 0; | |
783 | ||
784 | for (i = 0; i < ftrace_graph_notrace_count; i++) { | |
785 | if (addr == ftrace_graph_notrace_funcs[i]) | |
786 | return 1; | |
787 | } | |
788 | ||
789 | return 0; | |
790 | } | |
15e6cb36 | 791 | #else |
6b253930 IM |
792 | static inline int ftrace_graph_addr(unsigned long addr) |
793 | { | |
794 | return 1; | |
ea4e2bc4 | 795 | } |
29ad23b0 NK |
796 | |
797 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
798 | { | |
799 | return 0; | |
800 | } | |
ea4e2bc4 | 801 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
ea4e2bc4 | 802 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 803 | static inline enum print_line_t |
d7a8d9e9 | 804 | print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
15e6cb36 FW |
805 | { |
806 | return TRACE_TYPE_UNHANDLED; | |
807 | } | |
ea4e2bc4 | 808 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 809 | |
756d17ee | 810 | extern struct list_head ftrace_pids; |
804a6851 | 811 | |
1155de47 | 812 | #ifdef CONFIG_FUNCTION_TRACER |
f1ed7c74 | 813 | extern bool ftrace_filter_param __initdata; |
804a6851 SR |
814 | static inline int ftrace_trace_task(struct task_struct *task) |
815 | { | |
756d17ee | 816 | if (list_empty(&ftrace_pids)) |
804a6851 SR |
817 | return 1; |
818 | ||
819 | return test_tsk_trace_trace(task); | |
820 | } | |
e0a413f6 | 821 | extern int ftrace_is_dead(void); |
591dffda SRRH |
822 | int ftrace_create_function_files(struct trace_array *tr, |
823 | struct dentry *parent); | |
824 | void ftrace_destroy_function_files(struct trace_array *tr); | |
1155de47 PM |
825 | #else |
826 | static inline int ftrace_trace_task(struct task_struct *task) | |
827 | { | |
828 | return 1; | |
829 | } | |
e0a413f6 | 830 | static inline int ftrace_is_dead(void) { return 0; } |
591dffda SRRH |
831 | static inline int |
832 | ftrace_create_function_files(struct trace_array *tr, | |
833 | struct dentry *parent) | |
834 | { | |
835 | return 0; | |
836 | } | |
837 | static inline void ftrace_destroy_function_files(struct trace_array *tr) { } | |
838 | #endif /* CONFIG_FUNCTION_TRACER */ | |
839 | ||
840 | #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) | |
841 | void ftrace_create_filter_files(struct ftrace_ops *ops, | |
842 | struct dentry *parent); | |
843 | void ftrace_destroy_filter_files(struct ftrace_ops *ops); | |
844 | #else | |
845 | /* | |
846 | * The ops parameter passed in is usually undefined. | |
847 | * This must be a macro. | |
848 | */ | |
849 | #define ftrace_create_filter_files(ops, parent) do { } while (0) | |
850 | #define ftrace_destroy_filter_files(ops) do { } while (0) | |
851 | #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ | |
804a6851 | 852 | |
ced39002 JO |
853 | int ftrace_event_is_function(struct ftrace_event_call *call); |
854 | ||
b63f39ea | 855 | /* |
856 | * struct trace_parser - servers for reading the user input separated by spaces | |
857 | * @cont: set if the input is not complete - no final space char was found | |
858 | * @buffer: holds the parsed user input | |
1537a363 | 859 | * @idx: user input length |
b63f39ea | 860 | * @size: buffer size |
861 | */ | |
862 | struct trace_parser { | |
863 | bool cont; | |
864 | char *buffer; | |
865 | unsigned idx; | |
866 | unsigned size; | |
867 | }; | |
868 | ||
869 | static inline bool trace_parser_loaded(struct trace_parser *parser) | |
870 | { | |
871 | return (parser->idx != 0); | |
872 | } | |
873 | ||
874 | static inline bool trace_parser_cont(struct trace_parser *parser) | |
875 | { | |
876 | return parser->cont; | |
877 | } | |
878 | ||
879 | static inline void trace_parser_clear(struct trace_parser *parser) | |
880 | { | |
881 | parser->cont = false; | |
882 | parser->idx = 0; | |
883 | } | |
884 | ||
885 | extern int trace_parser_get_init(struct trace_parser *parser, int size); | |
886 | extern void trace_parser_put(struct trace_parser *parser); | |
887 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
888 | size_t cnt, loff_t *ppos); | |
889 | ||
4fcdae83 SR |
890 | /* |
891 | * trace_iterator_flags is an enumeration that defines bit | |
892 | * positions into trace_flags that controls the output. | |
893 | * | |
894 | * NOTE: These bits must match the trace_options array in | |
895 | * trace.c. | |
896 | */ | |
4e655519 IM |
897 | enum trace_iterator_flags { |
898 | TRACE_ITER_PRINT_PARENT = 0x01, | |
899 | TRACE_ITER_SYM_OFFSET = 0x02, | |
900 | TRACE_ITER_SYM_ADDR = 0x04, | |
901 | TRACE_ITER_VERBOSE = 0x08, | |
902 | TRACE_ITER_RAW = 0x10, | |
903 | TRACE_ITER_HEX = 0x20, | |
904 | TRACE_ITER_BIN = 0x40, | |
905 | TRACE_ITER_BLOCK = 0x80, | |
906 | TRACE_ITER_STACKTRACE = 0x100, | |
2cbafd68 LZ |
907 | TRACE_ITER_PRINTK = 0x200, |
908 | TRACE_ITER_PREEMPTONLY = 0x400, | |
909 | TRACE_ITER_BRANCH = 0x800, | |
910 | TRACE_ITER_ANNOTATE = 0x1000, | |
911 | TRACE_ITER_USERSTACKTRACE = 0x2000, | |
912 | TRACE_ITER_SYM_USEROBJ = 0x4000, | |
913 | TRACE_ITER_PRINTK_MSGONLY = 0x8000, | |
914 | TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ | |
915 | TRACE_ITER_LATENCY_FMT = 0x20000, | |
916 | TRACE_ITER_SLEEP_TIME = 0x40000, | |
917 | TRACE_ITER_GRAPH_TIME = 0x80000, | |
e870e9a1 | 918 | TRACE_ITER_RECORD_CMD = 0x100000, |
750912fa | 919 | TRACE_ITER_OVERWRITE = 0x200000, |
cf30cf67 | 920 | TRACE_ITER_STOP_ON_FREE = 0x400000, |
77271ce4 | 921 | TRACE_ITER_IRQ_INFO = 0x800000, |
5224c3a3 | 922 | TRACE_ITER_MARKERS = 0x1000000, |
328df475 | 923 | TRACE_ITER_FUNCTION = 0x2000000, |
4e655519 IM |
924 | }; |
925 | ||
15e6cb36 FW |
926 | /* |
927 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
928 | * control the output of kernel symbols. | |
929 | */ | |
930 | #define TRACE_ITER_SYM_MASK \ | |
931 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
932 | ||
43a15386 FW |
933 | extern struct tracer nop_trace; |
934 | ||
2ed84eeb | 935 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
936 | extern int enable_branch_tracing(struct trace_array *tr); |
937 | extern void disable_branch_tracing(void); | |
938 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 939 | { |
9f029e83 SR |
940 | if (trace_flags & TRACE_ITER_BRANCH) |
941 | return enable_branch_tracing(tr); | |
52f232cb SR |
942 | return 0; |
943 | } | |
9f029e83 | 944 | static inline void trace_branch_disable(void) |
52f232cb SR |
945 | { |
946 | /* due to races, always disable */ | |
9f029e83 | 947 | disable_branch_tracing(); |
52f232cb SR |
948 | } |
949 | #else | |
9f029e83 | 950 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
951 | { |
952 | return 0; | |
953 | } | |
9f029e83 | 954 | static inline void trace_branch_disable(void) |
52f232cb SR |
955 | { |
956 | } | |
2ed84eeb | 957 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 958 | |
1852fcce SR |
959 | /* set ring buffers to default size if not already done so */ |
960 | int tracing_update_buffers(void); | |
961 | ||
cf027f64 TZ |
962 | struct ftrace_event_field { |
963 | struct list_head link; | |
92edca07 SR |
964 | const char *name; |
965 | const char *type; | |
aa38e9fc | 966 | int filter_type; |
cf027f64 TZ |
967 | int offset; |
968 | int size; | |
a118e4d1 | 969 | int is_signed; |
cf027f64 TZ |
970 | }; |
971 | ||
30e673b2 | 972 | struct event_filter { |
c9c53ca0 SR |
973 | int n_preds; /* Number assigned */ |
974 | int a_preds; /* allocated */ | |
74e9e58c | 975 | struct filter_pred *preds; |
61e9dea2 | 976 | struct filter_pred *root; |
8b372562 | 977 | char *filter_string; |
30e673b2 TZ |
978 | }; |
979 | ||
cfb180f3 TZ |
980 | struct event_subsystem { |
981 | struct list_head list; | |
982 | const char *name; | |
1f9963cb | 983 | struct event_filter *filter; |
e9dbfae5 | 984 | int ref_count; |
cfb180f3 TZ |
985 | }; |
986 | ||
ae63b31e SR |
987 | struct ftrace_subsystem_dir { |
988 | struct list_head list; | |
989 | struct event_subsystem *subsystem; | |
990 | struct trace_array *tr; | |
991 | struct dentry *entry; | |
992 | int ref_count; | |
993 | int nr_events; | |
994 | }; | |
995 | ||
61e9dea2 SR |
996 | #define FILTER_PRED_INVALID ((unsigned short)-1) |
997 | #define FILTER_PRED_IS_RIGHT (1 << 15) | |
43cd4145 | 998 | #define FILTER_PRED_FOLD (1 << 15) |
61e9dea2 | 999 | |
bf93f9ed SR |
1000 | /* |
1001 | * The max preds is the size of unsigned short with | |
1002 | * two flags at the MSBs. One bit is used for both the IS_RIGHT | |
1003 | * and FOLD flags. The other is reserved. | |
1004 | * | |
1005 | * 2^14 preds is way more than enough. | |
1006 | */ | |
1007 | #define MAX_FILTER_PRED 16384 | |
4a3d27e9 | 1008 | |
7ce7e424 | 1009 | struct filter_pred; |
1889d209 | 1010 | struct regex; |
7ce7e424 | 1011 | |
58d9a597 | 1012 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); |
7ce7e424 | 1013 | |
1889d209 FW |
1014 | typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
1015 | ||
3f6fe06d | 1016 | enum regex_type { |
b0f1a59a | 1017 | MATCH_FULL = 0, |
3f6fe06d FW |
1018 | MATCH_FRONT_ONLY, |
1019 | MATCH_MIDDLE_ONLY, | |
1020 | MATCH_END_ONLY, | |
1021 | }; | |
1022 | ||
1889d209 FW |
1023 | struct regex { |
1024 | char pattern[MAX_FILTER_STR_VAL]; | |
1025 | int len; | |
1026 | int field_len; | |
1027 | regex_match_func match; | |
1028 | }; | |
1029 | ||
7ce7e424 | 1030 | struct filter_pred { |
1889d209 FW |
1031 | filter_pred_fn_t fn; |
1032 | u64 val; | |
1033 | struct regex regex; | |
61aaef55 | 1034 | unsigned short *ops; |
1d0e78e3 | 1035 | struct ftrace_event_field *field; |
1889d209 FW |
1036 | int offset; |
1037 | int not; | |
1038 | int op; | |
61e9dea2 SR |
1039 | unsigned short index; |
1040 | unsigned short parent; | |
1041 | unsigned short left; | |
1042 | unsigned short right; | |
7ce7e424 TZ |
1043 | }; |
1044 | ||
3f6fe06d FW |
1045 | extern enum regex_type |
1046 | filter_parse_regex(char *buff, int len, char **search, int *not); | |
f306cc82 | 1047 | extern void print_event_filter(struct ftrace_event_file *file, |
4bda2d51 | 1048 | struct trace_seq *s); |
f306cc82 | 1049 | extern int apply_event_filter(struct ftrace_event_file *file, |
8b372562 | 1050 | char *filter_string); |
ae63b31e | 1051 | extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir, |
8b372562 TZ |
1052 | char *filter_string); |
1053 | extern void print_subsystem_event_filter(struct event_subsystem *system, | |
ac1adc55 | 1054 | struct trace_seq *s); |
aa38e9fc | 1055 | extern int filter_assign_type(const char *type); |
bac5fb97 TZ |
1056 | extern int create_event_filter(struct ftrace_event_call *call, |
1057 | char *filter_str, bool set_str, | |
1058 | struct event_filter **filterp); | |
1059 | extern void free_event_filter(struct event_filter *filter); | |
7ce7e424 | 1060 | |
b3a8c6fd J |
1061 | struct ftrace_event_field * |
1062 | trace_find_event_field(struct ftrace_event_call *call, char *name); | |
2e33af02 | 1063 | |
e870e9a1 | 1064 | extern void trace_event_enable_cmd_record(bool enable); |
277ba044 | 1065 | extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); |
0c8916c3 | 1066 | extern int event_trace_del_tracer(struct trace_array *tr); |
e870e9a1 | 1067 | |
7862ad18 TZ |
1068 | extern struct ftrace_event_file *find_event_file(struct trace_array *tr, |
1069 | const char *system, | |
1070 | const char *event); | |
1071 | ||
85f2b082 TZ |
1072 | static inline void *event_file_data(struct file *filp) |
1073 | { | |
1074 | return ACCESS_ONCE(file_inode(filp)->i_private); | |
1075 | } | |
1076 | ||
20c8928a | 1077 | extern struct mutex event_mutex; |
a59fd602 | 1078 | extern struct list_head ftrace_events; |
ac199db0 | 1079 | |
85f2b082 TZ |
1080 | extern const struct file_operations event_trigger_fops; |
1081 | ||
1082 | extern int register_trigger_cmds(void); | |
1083 | extern void clear_event_triggers(struct trace_array *tr); | |
1084 | ||
1085 | struct event_trigger_data { | |
1086 | unsigned long count; | |
1087 | int ref; | |
1088 | struct event_trigger_ops *ops; | |
1089 | struct event_command *cmd_ops; | |
d8a30f20 | 1090 | struct event_filter __rcu *filter; |
85f2b082 TZ |
1091 | char *filter_str; |
1092 | void *private_data; | |
1093 | struct list_head list; | |
1094 | }; | |
1095 | ||
1096 | /** | |
1097 | * struct event_trigger_ops - callbacks for trace event triggers | |
1098 | * | |
1099 | * The methods in this structure provide per-event trigger hooks for | |
1100 | * various trigger operations. | |
1101 | * | |
1102 | * All the methods below, except for @init() and @free(), must be | |
1103 | * implemented. | |
1104 | * | |
1105 | * @func: The trigger 'probe' function called when the triggering | |
1106 | * event occurs. The data passed into this callback is the data | |
1107 | * that was supplied to the event_command @reg() function that | |
1108 | * registered the trigger (see struct event_command). | |
1109 | * | |
1110 | * @init: An optional initialization function called for the trigger | |
1111 | * when the trigger is registered (via the event_command reg() | |
1112 | * function). This can be used to perform per-trigger | |
1113 | * initialization such as incrementing a per-trigger reference | |
1114 | * count, for instance. This is usually implemented by the | |
1115 | * generic utility function @event_trigger_init() (see | |
1116 | * trace_event_triggers.c). | |
1117 | * | |
1118 | * @free: An optional de-initialization function called for the | |
1119 | * trigger when the trigger is unregistered (via the | |
1120 | * event_command @reg() function). This can be used to perform | |
1121 | * per-trigger de-initialization such as decrementing a | |
1122 | * per-trigger reference count and freeing corresponding trigger | |
1123 | * data, for instance. This is usually implemented by the | |
1124 | * generic utility function @event_trigger_free() (see | |
1125 | * trace_event_triggers.c). | |
1126 | * | |
1127 | * @print: The callback function invoked to have the trigger print | |
1128 | * itself. This is usually implemented by a wrapper function | |
1129 | * that calls the generic utility function @event_trigger_print() | |
1130 | * (see trace_event_triggers.c). | |
1131 | */ | |
1132 | struct event_trigger_ops { | |
1133 | void (*func)(struct event_trigger_data *data); | |
1134 | int (*init)(struct event_trigger_ops *ops, | |
1135 | struct event_trigger_data *data); | |
1136 | void (*free)(struct event_trigger_ops *ops, | |
1137 | struct event_trigger_data *data); | |
1138 | int (*print)(struct seq_file *m, | |
1139 | struct event_trigger_ops *ops, | |
1140 | struct event_trigger_data *data); | |
1141 | }; | |
1142 | ||
1143 | /** | |
1144 | * struct event_command - callbacks and data members for event commands | |
1145 | * | |
1146 | * Event commands are invoked by users by writing the command name | |
1147 | * into the 'trigger' file associated with a trace event. The | |
1148 | * parameters associated with a specific invocation of an event | |
1149 | * command are used to create an event trigger instance, which is | |
1150 | * added to the list of trigger instances associated with that trace | |
1151 | * event. When the event is hit, the set of triggers associated with | |
1152 | * that event is invoked. | |
1153 | * | |
1154 | * The data members in this structure provide per-event command data | |
1155 | * for various event commands. | |
1156 | * | |
1157 | * All the data members below, except for @post_trigger, must be set | |
1158 | * for each event command. | |
1159 | * | |
1160 | * @name: The unique name that identifies the event command. This is | |
1161 | * the name used when setting triggers via trigger files. | |
1162 | * | |
1163 | * @trigger_type: A unique id that identifies the event command | |
1164 | * 'type'. This value has two purposes, the first to ensure that | |
1165 | * only one trigger of the same type can be set at a given time | |
1166 | * for a particular event e.g. it doesn't make sense to have both | |
1167 | * a traceon and traceoff trigger attached to a single event at | |
1168 | * the same time, so traceon and traceoff have the same type | |
1169 | * though they have different names. The @trigger_type value is | |
1170 | * also used as a bit value for deferring the actual trigger | |
1171 | * action until after the current event is finished. Some | |
1172 | * commands need to do this if they themselves log to the trace | |
1173 | * buffer (see the @post_trigger() member below). @trigger_type | |
1174 | * values are defined by adding new values to the trigger_type | |
1175 | * enum in include/linux/ftrace_event.h. | |
1176 | * | |
1177 | * @post_trigger: A flag that says whether or not this command needs | |
1178 | * to have its action delayed until after the current event has | |
1179 | * been closed. Some triggers need to avoid being invoked while | |
1180 | * an event is currently in the process of being logged, since | |
1181 | * the trigger may itself log data into the trace buffer. Thus | |
1182 | * we make sure the current event is committed before invoking | |
1183 | * those triggers. To do that, the trigger invocation is split | |
1184 | * in two - the first part checks the filter using the current | |
1185 | * trace record; if a command has the @post_trigger flag set, it | |
1186 | * sets a bit for itself in the return value, otherwise it | |
1187 | * directly invokes the trigger. Once all commands have been | |
1188 | * either invoked or set their return flag, the current record is | |
1189 | * either committed or discarded. At that point, if any commands | |
1190 | * have deferred their triggers, those commands are finally | |
1191 | * invoked following the close of the current event. In other | |
1192 | * words, if the event_trigger_ops @func() probe implementation | |
1193 | * itself logs to the trace buffer, this flag should be set, | |
1194 | * otherwise it can be left unspecified. | |
1195 | * | |
1196 | * All the methods below, except for @set_filter(), must be | |
1197 | * implemented. | |
1198 | * | |
1199 | * @func: The callback function responsible for parsing and | |
1200 | * registering the trigger written to the 'trigger' file by the | |
1201 | * user. It allocates the trigger instance and registers it with | |
1202 | * the appropriate trace event. It makes use of the other | |
1203 | * event_command callback functions to orchestrate this, and is | |
1204 | * usually implemented by the generic utility function | |
1205 | * @event_trigger_callback() (see trace_event_triggers.c). | |
1206 | * | |
1207 | * @reg: Adds the trigger to the list of triggers associated with the | |
1208 | * event, and enables the event trigger itself, after | |
1209 | * initializing it (via the event_trigger_ops @init() function). | |
1210 | * This is also where commands can use the @trigger_type value to | |
1211 | * make the decision as to whether or not multiple instances of | |
1212 | * the trigger should be allowed. This is usually implemented by | |
1213 | * the generic utility function @register_trigger() (see | |
1214 | * trace_event_triggers.c). | |
1215 | * | |
1216 | * @unreg: Removes the trigger from the list of triggers associated | |
1217 | * with the event, and disables the event trigger itself, after | |
1218 | * initializing it (via the event_trigger_ops @free() function). | |
1219 | * This is usually implemented by the generic utility function | |
1220 | * @unregister_trigger() (see trace_event_triggers.c). | |
1221 | * | |
1222 | * @set_filter: An optional function called to parse and set a filter | |
1223 | * for the trigger. If no @set_filter() method is set for the | |
1224 | * event command, filters set by the user for the command will be | |
1225 | * ignored. This is usually implemented by the generic utility | |
1226 | * function @set_trigger_filter() (see trace_event_triggers.c). | |
1227 | * | |
1228 | * @get_trigger_ops: The callback function invoked to retrieve the | |
1229 | * event_trigger_ops implementation associated with the command. | |
1230 | */ | |
1231 | struct event_command { | |
1232 | struct list_head list; | |
1233 | char *name; | |
1234 | enum event_trigger_type trigger_type; | |
1235 | bool post_trigger; | |
1236 | int (*func)(struct event_command *cmd_ops, | |
1237 | struct ftrace_event_file *file, | |
1238 | char *glob, char *cmd, char *params); | |
1239 | int (*reg)(char *glob, | |
1240 | struct event_trigger_ops *ops, | |
1241 | struct event_trigger_data *data, | |
1242 | struct ftrace_event_file *file); | |
1243 | void (*unreg)(char *glob, | |
1244 | struct event_trigger_ops *ops, | |
1245 | struct event_trigger_data *data, | |
1246 | struct ftrace_event_file *file); | |
1247 | int (*set_filter)(char *filter_str, | |
1248 | struct event_trigger_data *data, | |
1249 | struct ftrace_event_file *file); | |
1250 | struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); | |
1251 | }; | |
1252 | ||
1253 | extern int trace_event_enable_disable(struct ftrace_event_file *file, | |
1254 | int enable, int soft_disable); | |
93e31ffb | 1255 | extern int tracing_alloc_snapshot(void); |
85f2b082 | 1256 | |
e9fb2b6d SR |
1257 | extern const char *__start___trace_bprintk_fmt[]; |
1258 | extern const char *__stop___trace_bprintk_fmt[]; | |
1259 | ||
102c9323 SRRH |
1260 | extern const char *__start___tracepoint_str[]; |
1261 | extern const char *__stop___tracepoint_str[]; | |
1262 | ||
07d777fe | 1263 | void trace_printk_init_buffers(void); |
81698831 | 1264 | void trace_printk_start_comm(void); |
613f04a0 | 1265 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); |
2b6080f2 | 1266 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); |
07d777fe | 1267 | |
ca268da6 SRRH |
1268 | /* |
1269 | * Normal trace_printk() and friends allocates special buffers | |
1270 | * to do the manipulation, as well as saves the print formats | |
1271 | * into sections to display. But the trace infrastructure wants | |
1272 | * to use these without the added overhead at the price of being | |
1273 | * a bit slower (used mainly for warnings, where we don't care | |
1274 | * about performance). The internal_trace_puts() is for such | |
1275 | * a purpose. | |
1276 | */ | |
1277 | #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) | |
1278 | ||
4e5292ea | 1279 | #undef FTRACE_ENTRY |
02aa3162 | 1280 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ |
86c38a31 JM |
1281 | extern struct ftrace_event_call \ |
1282 | __attribute__((__aligned__(4))) event_##call; | |
4e5292ea | 1283 | #undef FTRACE_ENTRY_DUP |
02aa3162 JO |
1284 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ |
1285 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
1286 | filter) | |
4e5292ea | 1287 | #include "trace_entries.h" |
e1112b4d | 1288 | |
6e48b550 | 1289 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) |
ced39002 JO |
1290 | int perf_ftrace_event_register(struct ftrace_event_call *call, |
1291 | enum trace_reg type, void *data); | |
1292 | #else | |
1293 | #define perf_ftrace_event_register NULL | |
6e48b550 | 1294 | #endif |
ced39002 | 1295 | |
bc0c38d1 | 1296 | #endif /* _LINUX_KERNEL_TRACE_H */ |