Commit | Line | Data |
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bc0c38d1 SR |
1 | #ifndef _LINUX_KERNEL_TRACE_H |
2 | #define _LINUX_KERNEL_TRACE_H | |
3 | ||
4 | #include <linux/fs.h> | |
60063497 | 5 | #include <linux/atomic.h> |
bc0c38d1 SR |
6 | #include <linux/sched.h> |
7 | #include <linux/clocksource.h> | |
3928a8a2 | 8 | #include <linux/ring_buffer.h> |
bd8ac686 | 9 | #include <linux/mmiotrace.h> |
4e5292ea | 10 | #include <linux/tracepoint.h> |
d13744cd | 11 | #include <linux/ftrace.h> |
24f1e32c | 12 | #include <linux/hw_breakpoint.h> |
9504504c | 13 | #include <linux/trace_seq.h> |
97f20251 | 14 | #include <linux/ftrace_event.h> |
9504504c | 15 | |
12ab74ee SR |
16 | #ifdef CONFIG_FTRACE_SYSCALLS |
17 | #include <asm/unistd.h> /* For NR_SYSCALLS */ | |
18 | #include <asm/syscall.h> /* some archs define it here */ | |
19 | #endif | |
20 | ||
72829bc3 TG |
21 | enum trace_type { |
22 | __TRACE_FIRST_TYPE = 0, | |
23 | ||
24 | TRACE_FN, | |
25 | TRACE_CTX, | |
26 | TRACE_WAKE, | |
27 | TRACE_STACK, | |
dd0e545f | 28 | TRACE_PRINT, |
48ead020 | 29 | TRACE_BPRINT, |
bd8ac686 PP |
30 | TRACE_MMIO_RW, |
31 | TRACE_MMIO_MAP, | |
9f029e83 | 32 | TRACE_BRANCH, |
287b6e68 FW |
33 | TRACE_GRAPH_RET, |
34 | TRACE_GRAPH_ENT, | |
02b67518 | 35 | TRACE_USER_STACK, |
c71a8961 | 36 | TRACE_BLK, |
09ae7234 | 37 | TRACE_BPUTS, |
72829bc3 | 38 | |
f0868d1e | 39 | __TRACE_LAST_TYPE, |
72829bc3 TG |
40 | }; |
41 | ||
bc0c38d1 | 42 | |
0a1c49db SR |
43 | #undef __field |
44 | #define __field(type, item) type item; | |
86387f7e | 45 | |
d7315094 SR |
46 | #undef __field_struct |
47 | #define __field_struct(type, item) __field(type, item) | |
86387f7e | 48 | |
d7315094 SR |
49 | #undef __field_desc |
50 | #define __field_desc(type, container, item) | |
02b67518 | 51 | |
0a1c49db SR |
52 | #undef __array |
53 | #define __array(type, item, size) type item[size]; | |
1427cdf0 | 54 | |
d7315094 SR |
55 | #undef __array_desc |
56 | #define __array_desc(type, container, item, size) | |
777e208d | 57 | |
0a1c49db SR |
58 | #undef __dynamic_array |
59 | #define __dynamic_array(type, item) type item[]; | |
777e208d | 60 | |
0a1c49db SR |
61 | #undef F_STRUCT |
62 | #define F_STRUCT(args...) args | |
74239072 | 63 | |
0a1c49db | 64 | #undef FTRACE_ENTRY |
02aa3162 JO |
65 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
66 | struct struct_name { \ | |
67 | struct trace_entry ent; \ | |
68 | tstruct \ | |
0a1c49db | 69 | } |
777e208d | 70 | |
0a1c49db SR |
71 | #undef TP_ARGS |
72 | #define TP_ARGS(args...) args | |
52f232cb | 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 SR |
155 | char comm[TASK_COMM_LEN]; |
156 | }; | |
157 | ||
2b6080f2 SR |
158 | struct tracer; |
159 | ||
12883efb SRRH |
160 | struct trace_buffer { |
161 | struct trace_array *tr; | |
162 | struct ring_buffer *buffer; | |
163 | struct trace_array_cpu __percpu *data; | |
164 | cycle_t time_start; | |
165 | int cpu; | |
166 | }; | |
167 | ||
bc0c38d1 SR |
168 | /* |
169 | * The trace array - an array of per-CPU trace arrays. This is the | |
170 | * highest level data structure that individual tracers deal with. | |
171 | * They have on/off state as well: | |
172 | */ | |
173 | struct trace_array { | |
ae63b31e | 174 | struct list_head list; |
277ba044 | 175 | char *name; |
12883efb SRRH |
176 | struct trace_buffer trace_buffer; |
177 | #ifdef CONFIG_TRACER_MAX_TRACE | |
178 | /* | |
179 | * The max_buffer is used to snapshot the trace when a maximum | |
180 | * latency is reached, or when the user initiates a snapshot. | |
181 | * Some tracers will use this to store a maximum trace while | |
182 | * it continues examining live traces. | |
183 | * | |
184 | * The buffers for the max_buffer are set up the same as the trace_buffer | |
185 | * When a snapshot is taken, the buffer of the max_buffer is swapped | |
186 | * with the buffer of the trace_buffer and the buffers are reset for | |
187 | * the trace_buffer so the tracing can continue. | |
188 | */ | |
189 | struct trace_buffer max_buffer; | |
45ad21ca | 190 | bool allocated_snapshot; |
12883efb | 191 | #endif |
499e5470 | 192 | int buffer_disabled; |
12ab74ee SR |
193 | #ifdef CONFIG_FTRACE_SYSCALLS |
194 | int sys_refcount_enter; | |
195 | int sys_refcount_exit; | |
196 | DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls); | |
197 | DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls); | |
198 | #endif | |
2b6080f2 SR |
199 | int stop_count; |
200 | int clock_id; | |
201 | struct tracer *current_trace; | |
ae63b31e | 202 | unsigned int flags; |
2b6080f2 | 203 | raw_spinlock_t start_lock; |
ae63b31e | 204 | struct dentry *dir; |
2b6080f2 SR |
205 | struct dentry *options; |
206 | struct dentry *percpu_dir; | |
ae63b31e SR |
207 | struct dentry *event_dir; |
208 | struct list_head systems; | |
209 | struct list_head events; | |
ccfe9e42 | 210 | cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
a695cb58 | 211 | int ref; |
bc0c38d1 SR |
212 | }; |
213 | ||
ae63b31e SR |
214 | enum { |
215 | TRACE_ARRAY_FL_GLOBAL = (1 << 0) | |
216 | }; | |
217 | ||
218 | extern struct list_head ftrace_trace_arrays; | |
219 | ||
a8227415 AL |
220 | extern struct mutex trace_types_lock; |
221 | ||
8e2e2fa4 SRRH |
222 | extern int trace_array_get(struct trace_array *tr); |
223 | extern void trace_array_put(struct trace_array *tr); | |
224 | ||
ae63b31e SR |
225 | /* |
226 | * The global tracer (top) should be the first trace array added, | |
227 | * but we check the flag anyway. | |
228 | */ | |
229 | static inline struct trace_array *top_trace_array(void) | |
230 | { | |
231 | struct trace_array *tr; | |
232 | ||
233 | tr = list_entry(ftrace_trace_arrays.prev, | |
234 | typeof(*tr), list); | |
235 | WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); | |
236 | return tr; | |
237 | } | |
238 | ||
7104f300 SR |
239 | #define FTRACE_CMP_TYPE(var, type) \ |
240 | __builtin_types_compatible_p(typeof(var), type *) | |
241 | ||
242 | #undef IF_ASSIGN | |
243 | #define IF_ASSIGN(var, entry, etype, id) \ | |
244 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
245 | var = (typeof(var))(entry); \ | |
246 | WARN_ON(id && (entry)->type != id); \ | |
247 | break; \ | |
248 | } | |
249 | ||
250 | /* Will cause compile errors if type is not found. */ | |
251 | extern void __ftrace_bad_type(void); | |
252 | ||
253 | /* | |
254 | * The trace_assign_type is a verifier that the entry type is | |
255 | * the same as the type being assigned. To add new types simply | |
256 | * add a line with the following format: | |
257 | * | |
258 | * IF_ASSIGN(var, ent, type, id); | |
259 | * | |
260 | * Where "type" is the trace type that includes the trace_entry | |
261 | * as the "ent" item. And "id" is the trace identifier that is | |
262 | * used in the trace_type enum. | |
263 | * | |
264 | * If the type can have more than one id, then use zero. | |
265 | */ | |
266 | #define trace_assign_type(var, ent) \ | |
267 | do { \ | |
268 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
269 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 270 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 271 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 272 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 273 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
09ae7234 | 274 | IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ |
7104f300 SR |
275 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
276 | TRACE_MMIO_RW); \ | |
277 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
278 | TRACE_MMIO_MAP); \ | |
9f029e83 | 279 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
280 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
281 | TRACE_GRAPH_ENT); \ | |
282 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
283 | TRACE_GRAPH_RET); \ | |
7104f300 SR |
284 | __ftrace_bad_type(); \ |
285 | } while (0) | |
2c4f035f | 286 | |
adf9f195 FW |
287 | /* |
288 | * An option specific to a tracer. This is a boolean value. | |
289 | * The bit is the bit index that sets its value on the | |
290 | * flags value in struct tracer_flags. | |
291 | */ | |
292 | struct tracer_opt { | |
9de36825 IM |
293 | const char *name; /* Will appear on the trace_options file */ |
294 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
295 | }; |
296 | ||
297 | /* | |
298 | * The set of specific options for a tracer. Your tracer | |
299 | * have to set the initial value of the flags val. | |
300 | */ | |
301 | struct tracer_flags { | |
302 | u32 val; | |
9de36825 | 303 | struct tracer_opt *opts; |
adf9f195 FW |
304 | }; |
305 | ||
306 | /* Makes more easy to define a tracer opt */ | |
307 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
308 | ||
034939b6 | 309 | |
6eaaa5d5 FW |
310 | /** |
311 | * struct tracer - a specific tracer and its callbacks to interact with debugfs | |
312 | * @name: the name chosen to select it on the available_tracers file | |
313 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
314 | * @reset: called when one switches to another tracer | |
315 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled) | |
316 | * @stop: called when tracing is paused (echo 0 > tracing_enabled) | |
317 | * @open: called when the trace file is opened | |
318 | * @pipe_open: called when the trace_pipe file is opened | |
319 | * @wait_pipe: override how the user waits for traces on trace_pipe | |
320 | * @close: called when the trace file is released | |
c521efd1 | 321 | * @pipe_close: called when the trace_pipe file is released |
6eaaa5d5 FW |
322 | * @read: override the default read callback on trace_pipe |
323 | * @splice_read: override the default splice_read callback on trace_pipe | |
324 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
325 | * @print_headers: override the first lines that describe your columns | |
326 | * @print_line: callback that prints a trace | |
327 | * @set_flag: signals one of your private flags changed (trace_options file) | |
328 | * @flags: your private flags | |
bc0c38d1 SR |
329 | */ |
330 | struct tracer { | |
331 | const char *name; | |
1c80025a | 332 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 333 | void (*reset)(struct trace_array *tr); |
9036990d SR |
334 | void (*start)(struct trace_array *tr); |
335 | void (*stop)(struct trace_array *tr); | |
bc0c38d1 | 336 | void (*open)(struct trace_iterator *iter); |
107bad8b | 337 | void (*pipe_open)(struct trace_iterator *iter); |
6eaaa5d5 | 338 | void (*wait_pipe)(struct trace_iterator *iter); |
bc0c38d1 | 339 | void (*close)(struct trace_iterator *iter); |
c521efd1 | 340 | void (*pipe_close)(struct trace_iterator *iter); |
107bad8b SR |
341 | ssize_t (*read)(struct trace_iterator *iter, |
342 | struct file *filp, char __user *ubuf, | |
343 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
344 | ssize_t (*splice_read)(struct trace_iterator *iter, |
345 | struct file *filp, | |
346 | loff_t *ppos, | |
347 | struct pipe_inode_info *pipe, | |
348 | size_t len, | |
349 | unsigned int flags); | |
60a11774 SR |
350 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
351 | int (*selftest)(struct tracer *trace, | |
352 | struct trace_array *tr); | |
353 | #endif | |
8bba1bf5 | 354 | void (*print_header)(struct seq_file *m); |
2c4f035f | 355 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 FW |
356 | /* If you handled the flag setting, return 0 */ |
357 | int (*set_flag)(u32 old_flags, u32 bit, int set); | |
613f04a0 SRRH |
358 | /* Return 0 if OK with change, else return non-zero */ |
359 | int (*flag_changed)(struct tracer *tracer, | |
360 | u32 mask, int set); | |
bc0c38d1 | 361 | struct tracer *next; |
9de36825 | 362 | struct tracer_flags *flags; |
f43c738b | 363 | bool print_max; |
12883efb SRRH |
364 | bool enabled; |
365 | #ifdef CONFIG_TRACER_MAX_TRACE | |
f43c738b | 366 | bool use_max_tr; |
12883efb | 367 | #endif |
bc0c38d1 SR |
368 | }; |
369 | ||
f9520750 | 370 | |
e4a3f541 | 371 | /* Only current can touch trace_recursion */ |
e4a3f541 | 372 | |
edc15caf SR |
373 | /* |
374 | * For function tracing recursion: | |
375 | * The order of these bits are important. | |
376 | * | |
377 | * When function tracing occurs, the following steps are made: | |
378 | * If arch does not support a ftrace feature: | |
379 | * call internal function (uses INTERNAL bits) which calls... | |
380 | * If callback is registered to the "global" list, the list | |
381 | * function is called and recursion checks the GLOBAL bits. | |
382 | * then this function calls... | |
383 | * The function callback, which can use the FTRACE bits to | |
384 | * check for recursion. | |
385 | * | |
386 | * Now if the arch does not suppport a feature, and it calls | |
387 | * the global list function which calls the ftrace callback | |
388 | * all three of these steps will do a recursion protection. | |
389 | * There's no reason to do one if the previous caller already | |
390 | * did. The recursion that we are protecting against will | |
391 | * go through the same steps again. | |
392 | * | |
393 | * To prevent the multiple recursion checks, if a recursion | |
394 | * bit is set that is higher than the MAX bit of the current | |
395 | * check, then we know that the check was made by the previous | |
396 | * caller, and we can skip the current check. | |
397 | */ | |
e46cbf75 | 398 | enum { |
567cd4da SR |
399 | TRACE_BUFFER_BIT, |
400 | TRACE_BUFFER_NMI_BIT, | |
401 | TRACE_BUFFER_IRQ_BIT, | |
402 | TRACE_BUFFER_SIRQ_BIT, | |
403 | ||
404 | /* Start of function recursion bits */ | |
405 | TRACE_FTRACE_BIT, | |
edc15caf SR |
406 | TRACE_FTRACE_NMI_BIT, |
407 | TRACE_FTRACE_IRQ_BIT, | |
408 | TRACE_FTRACE_SIRQ_BIT, | |
e46cbf75 | 409 | |
edc15caf | 410 | /* GLOBAL_BITs must be greater than FTRACE_BITs */ |
e46cbf75 SR |
411 | TRACE_GLOBAL_BIT, |
412 | TRACE_GLOBAL_NMI_BIT, | |
413 | TRACE_GLOBAL_IRQ_BIT, | |
414 | TRACE_GLOBAL_SIRQ_BIT, | |
415 | ||
edc15caf SR |
416 | /* INTERNAL_BITs must be greater than GLOBAL_BITs */ |
417 | TRACE_INTERNAL_BIT, | |
418 | TRACE_INTERNAL_NMI_BIT, | |
419 | TRACE_INTERNAL_IRQ_BIT, | |
420 | TRACE_INTERNAL_SIRQ_BIT, | |
421 | ||
e46cbf75 | 422 | TRACE_CONTROL_BIT, |
e248491a | 423 | |
e4a3f541 SR |
424 | /* |
425 | * Abuse of the trace_recursion. | |
426 | * As we need a way to maintain state if we are tracing the function | |
427 | * graph in irq because we want to trace a particular function that | |
428 | * was called in irq context but we have irq tracing off. Since this | |
429 | * can only be modified by current, we can reuse trace_recursion. | |
430 | */ | |
e46cbf75 SR |
431 | TRACE_IRQ_BIT, |
432 | }; | |
e4a3f541 | 433 | |
e46cbf75 SR |
434 | #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) |
435 | #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) | |
436 | #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) | |
e4a3f541 | 437 | |
edc15caf SR |
438 | #define TRACE_CONTEXT_BITS 4 |
439 | ||
440 | #define TRACE_FTRACE_START TRACE_FTRACE_BIT | |
441 | #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) | |
442 | ||
443 | #define TRACE_GLOBAL_START TRACE_GLOBAL_BIT | |
444 | #define TRACE_GLOBAL_MAX ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1) | |
445 | ||
446 | #define TRACE_LIST_START TRACE_INTERNAL_BIT | |
447 | #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) | |
448 | ||
449 | #define TRACE_CONTEXT_MASK TRACE_LIST_MAX | |
450 | ||
451 | static __always_inline int trace_get_context_bit(void) | |
452 | { | |
453 | int bit; | |
454 | ||
455 | if (in_interrupt()) { | |
456 | if (in_nmi()) | |
457 | bit = 0; | |
458 | ||
459 | else if (in_irq()) | |
460 | bit = 1; | |
461 | else | |
462 | bit = 2; | |
463 | } else | |
464 | bit = 3; | |
465 | ||
466 | return bit; | |
467 | } | |
468 | ||
469 | static __always_inline int trace_test_and_set_recursion(int start, int max) | |
470 | { | |
471 | unsigned int val = current->trace_recursion; | |
472 | int bit; | |
473 | ||
474 | /* A previous recursion check was made */ | |
475 | if ((val & TRACE_CONTEXT_MASK) > max) | |
476 | return 0; | |
477 | ||
478 | bit = trace_get_context_bit() + start; | |
479 | if (unlikely(val & (1 << bit))) | |
480 | return -1; | |
481 | ||
482 | val |= 1 << bit; | |
483 | current->trace_recursion = val; | |
484 | barrier(); | |
485 | ||
486 | return bit; | |
487 | } | |
488 | ||
489 | static __always_inline void trace_clear_recursion(int bit) | |
490 | { | |
491 | unsigned int val = current->trace_recursion; | |
492 | ||
493 | if (!bit) | |
494 | return; | |
495 | ||
496 | bit = 1 << bit; | |
497 | val &= ~bit; | |
498 | ||
499 | barrier(); | |
500 | current->trace_recursion = val; | |
501 | } | |
502 | ||
6d158a81 SR |
503 | static inline struct ring_buffer_iter * |
504 | trace_buffer_iter(struct trace_iterator *iter, int cpu) | |
505 | { | |
506 | if (iter->buffer_iter && iter->buffer_iter[cpu]) | |
507 | return iter->buffer_iter[cpu]; | |
508 | return NULL; | |
509 | } | |
510 | ||
b6f11df2 | 511 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 512 | int tracing_is_enabled(void); |
12883efb SRRH |
513 | void tracing_reset(struct trace_buffer *buf, int cpu); |
514 | void tracing_reset_online_cpus(struct trace_buffer *buf); | |
9456f0fa | 515 | void tracing_reset_current(int cpu); |
873c642f | 516 | void tracing_reset_all_online_cpus(void); |
bc0c38d1 | 517 | int tracing_open_generic(struct inode *inode, struct file *filp); |
5452af66 | 518 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 519 | umode_t mode, |
5452af66 FW |
520 | struct dentry *parent, |
521 | void *data, | |
522 | const struct file_operations *fops); | |
523 | ||
2b6080f2 | 524 | struct dentry *tracing_init_dentry_tr(struct trace_array *tr); |
bc0c38d1 | 525 | struct dentry *tracing_init_dentry(void); |
d618b3e6 | 526 | |
51a763dd ACM |
527 | struct ring_buffer_event; |
528 | ||
e77405ad SR |
529 | struct ring_buffer_event * |
530 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
531 | int type, | |
532 | unsigned long len, | |
533 | unsigned long flags, | |
534 | int pc); | |
51a763dd | 535 | |
45dcd8b8 PP |
536 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
537 | struct trace_array_cpu *data); | |
c4a8e8be FW |
538 | |
539 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
540 | int *ent_cpu, u64 *ent_ts); | |
541 | ||
7ffbd48d SR |
542 | void __buffer_unlock_commit(struct ring_buffer *buffer, |
543 | struct ring_buffer_event *event); | |
544 | ||
955b61e5 JW |
545 | int trace_empty(struct trace_iterator *iter); |
546 | ||
547 | void *trace_find_next_entry_inc(struct trace_iterator *iter); | |
548 | ||
549 | void trace_init_global_iter(struct trace_iterator *iter); | |
550 | ||
551 | void tracing_iter_reset(struct trace_iterator *iter, int cpu); | |
552 | ||
6eaaa5d5 FW |
553 | void poll_wait_pipe(struct trace_iterator *iter); |
554 | ||
bc0c38d1 | 555 | void tracing_sched_switch_trace(struct trace_array *tr, |
bc0c38d1 SR |
556 | struct task_struct *prev, |
557 | struct task_struct *next, | |
38697053 | 558 | unsigned long flags, int pc); |
57422797 IM |
559 | |
560 | void tracing_sched_wakeup_trace(struct trace_array *tr, | |
57422797 IM |
561 | struct task_struct *wakee, |
562 | struct task_struct *cur, | |
38697053 | 563 | unsigned long flags, int pc); |
6fb44b71 | 564 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
565 | unsigned long ip, |
566 | unsigned long parent_ip, | |
38697053 | 567 | unsigned long flags, int pc); |
0a772620 JO |
568 | void trace_graph_function(struct trace_array *tr, |
569 | unsigned long ip, | |
570 | unsigned long parent_ip, | |
571 | unsigned long flags, int pc); | |
7e9a49ef | 572 | void trace_latency_header(struct seq_file *m); |
62b915f1 JO |
573 | void trace_default_header(struct seq_file *m); |
574 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter); | |
575 | int trace_empty(struct trace_iterator *iter); | |
bc0c38d1 | 576 | |
287b6e68 | 577 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 578 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1a0799a8 | 579 | void set_graph_array(struct trace_array *tr); |
1e9b51c2 | 580 | |
41bc8144 SR |
581 | void tracing_start_cmdline_record(void); |
582 | void tracing_stop_cmdline_record(void); | |
e168e051 SR |
583 | void tracing_sched_switch_assign_trace(struct trace_array *tr); |
584 | void tracing_stop_sched_switch_record(void); | |
585 | void tracing_start_sched_switch_record(void); | |
bc0c38d1 | 586 | int register_tracer(struct tracer *type); |
b5130b1e | 587 | int is_tracing_stopped(void); |
955b61e5 JW |
588 | |
589 | extern cpumask_var_t __read_mostly tracing_buffer_mask; | |
590 | ||
591 | #define for_each_tracing_cpu(cpu) \ | |
592 | for_each_cpu(cpu, tracing_buffer_mask) | |
bc0c38d1 SR |
593 | |
594 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
595 | ||
0e950173 TB |
596 | extern unsigned long tracing_thresh; |
597 | ||
5d4a9dba | 598 | #ifdef CONFIG_TRACER_MAX_TRACE |
bc0c38d1 | 599 | extern unsigned long tracing_max_latency; |
bc0c38d1 SR |
600 | |
601 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); | |
602 | void update_max_tr_single(struct trace_array *tr, | |
603 | struct task_struct *tsk, int cpu); | |
5d4a9dba | 604 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 605 | |
c0a0d0d3 | 606 | #ifdef CONFIG_STACKTRACE |
e77405ad | 607 | void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
608 | int skip, int pc); |
609 | ||
1fd8df2c MH |
610 | void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, |
611 | int skip, int pc, struct pt_regs *regs); | |
612 | ||
e77405ad | 613 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
614 | int pc); |
615 | ||
616 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, | |
617 | int pc); | |
618 | #else | |
e1f7992e | 619 | static inline void ftrace_trace_stack(struct ring_buffer *buffer, |
c0a0d0d3 FW |
620 | unsigned long flags, int skip, int pc) |
621 | { | |
622 | } | |
623 | ||
1fd8df2c MH |
624 | static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer, |
625 | unsigned long flags, int skip, | |
626 | int pc, struct pt_regs *regs) | |
627 | { | |
628 | } | |
629 | ||
e1f7992e | 630 | static inline void ftrace_trace_userstack(struct ring_buffer *buffer, |
c0a0d0d3 FW |
631 | unsigned long flags, int pc) |
632 | { | |
633 | } | |
634 | ||
635 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags, | |
636 | int skip, int pc) | |
637 | { | |
638 | } | |
639 | #endif /* CONFIG_STACKTRACE */ | |
53614991 | 640 | |
e309b41d | 641 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 642 | |
4ca53085 | 643 | extern void trace_find_cmdline(int pid, char comm[]); |
f7d48cbd | 644 | |
bc0c38d1 SR |
645 | #ifdef CONFIG_DYNAMIC_FTRACE |
646 | extern unsigned long ftrace_update_tot_cnt; | |
ad97772a | 647 | #endif |
d05cdb25 SR |
648 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
649 | extern int DYN_FTRACE_TEST_NAME(void); | |
95950c2e SR |
650 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 |
651 | extern int DYN_FTRACE_TEST_NAME2(void); | |
bc0c38d1 | 652 | |
55034cd6 | 653 | extern bool ring_buffer_expanded; |
020e5f85 | 654 | extern bool tracing_selftest_disabled; |
9288f99a | 655 | DECLARE_PER_CPU(int, ftrace_cpu_disabled); |
020e5f85 | 656 | |
60a11774 | 657 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
658 | extern int trace_selftest_startup_function(struct tracer *trace, |
659 | struct trace_array *tr); | |
7447dce9 FW |
660 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
661 | struct trace_array *tr); | |
60a11774 SR |
662 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
663 | struct trace_array *tr); | |
60a11774 SR |
664 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
665 | struct trace_array *tr); | |
60a11774 SR |
666 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
667 | struct trace_array *tr); | |
60a11774 SR |
668 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
669 | struct trace_array *tr); | |
fb1b6d8b SN |
670 | extern int trace_selftest_startup_nop(struct tracer *trace, |
671 | struct trace_array *tr); | |
60a11774 SR |
672 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
673 | struct trace_array *tr); | |
80e5ea45 SR |
674 | extern int trace_selftest_startup_branch(struct tracer *trace, |
675 | struct trace_array *tr); | |
8f768993 SRRH |
676 | /* |
677 | * Tracer data references selftest functions that only occur | |
678 | * on boot up. These can be __init functions. Thus, when selftests | |
679 | * are enabled, then the tracers need to reference __init functions. | |
680 | */ | |
681 | #define __tracer_data __refdata | |
682 | #else | |
683 | /* Tracers are seldom changed. Optimize when selftests are disabled. */ | |
684 | #define __tracer_data __read_mostly | |
60a11774 SR |
685 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
686 | ||
c7aafc54 | 687 | extern void *head_page(struct trace_array_cpu *data); |
cf8e3474 | 688 | extern unsigned long long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 689 | extern int |
40ce74f1 | 690 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 691 | extern int |
40ce74f1 | 692 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
659372d3 SR |
693 | extern int |
694 | trace_array_vprintk(struct trace_array *tr, | |
695 | unsigned long ip, const char *fmt, va_list args); | |
696 | int trace_array_printk(struct trace_array *tr, | |
697 | unsigned long ip, const char *fmt, ...); | |
12883efb SRRH |
698 | int trace_array_printk_buf(struct ring_buffer *buffer, |
699 | unsigned long ip, const char *fmt, ...); | |
955b61e5 JW |
700 | void trace_printk_seq(struct trace_seq *s); |
701 | enum print_line_t print_trace_line(struct trace_iterator *iter); | |
c7aafc54 | 702 | |
4e655519 IM |
703 | extern unsigned long trace_flags; |
704 | ||
15e6cb36 | 705 | /* Standard output formatting function used for function return traces */ |
fb52607a | 706 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
62b915f1 JO |
707 | |
708 | /* Flag options */ | |
709 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1 | |
710 | #define TRACE_GRAPH_PRINT_CPU 0x2 | |
711 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 | |
712 | #define TRACE_GRAPH_PRINT_PROC 0x8 | |
713 | #define TRACE_GRAPH_PRINT_DURATION 0x10 | |
714 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 | |
715 | ||
d7a8d9e9 JO |
716 | extern enum print_line_t |
717 | print_graph_function_flags(struct trace_iterator *iter, u32 flags); | |
718 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags); | |
0706f1c4 SR |
719 | extern enum print_line_t |
720 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); | |
62b915f1 JO |
721 | extern void graph_trace_open(struct trace_iterator *iter); |
722 | extern void graph_trace_close(struct trace_iterator *iter); | |
723 | extern int __trace_graph_entry(struct trace_array *tr, | |
724 | struct ftrace_graph_ent *trace, | |
725 | unsigned long flags, int pc); | |
726 | extern void __trace_graph_return(struct trace_array *tr, | |
727 | struct ftrace_graph_ret *trace, | |
728 | unsigned long flags, int pc); | |
729 | ||
ea4e2bc4 SR |
730 | |
731 | #ifdef CONFIG_DYNAMIC_FTRACE | |
732 | /* TODO: make this variable */ | |
733 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
c7c6b1fe | 734 | extern int ftrace_graph_filter_enabled; |
ea4e2bc4 SR |
735 | extern int ftrace_graph_count; |
736 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
737 | ||
738 | static inline int ftrace_graph_addr(unsigned long addr) | |
739 | { | |
740 | int i; | |
741 | ||
c7c6b1fe | 742 | if (!ftrace_graph_filter_enabled) |
ea4e2bc4 SR |
743 | return 1; |
744 | ||
745 | for (i = 0; i < ftrace_graph_count; i++) { | |
e4a3f541 SR |
746 | if (addr == ftrace_graph_funcs[i]) { |
747 | /* | |
748 | * If no irqs are to be traced, but a set_graph_function | |
749 | * is set, and called by an interrupt handler, we still | |
750 | * want to trace it. | |
751 | */ | |
752 | if (in_irq()) | |
753 | trace_recursion_set(TRACE_IRQ_BIT); | |
754 | else | |
755 | trace_recursion_clear(TRACE_IRQ_BIT); | |
ea4e2bc4 | 756 | return 1; |
e4a3f541 | 757 | } |
ea4e2bc4 SR |
758 | } |
759 | ||
760 | return 0; | |
761 | } | |
15e6cb36 | 762 | #else |
6b253930 IM |
763 | static inline int ftrace_graph_addr(unsigned long addr) |
764 | { | |
765 | return 1; | |
ea4e2bc4 SR |
766 | } |
767 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
ea4e2bc4 | 768 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 769 | static inline enum print_line_t |
d7a8d9e9 | 770 | print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
15e6cb36 FW |
771 | { |
772 | return TRACE_TYPE_UNHANDLED; | |
773 | } | |
ea4e2bc4 | 774 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 775 | |
756d17ee | 776 | extern struct list_head ftrace_pids; |
804a6851 | 777 | |
1155de47 | 778 | #ifdef CONFIG_FUNCTION_TRACER |
f1ed7c74 | 779 | extern bool ftrace_filter_param __initdata; |
804a6851 SR |
780 | static inline int ftrace_trace_task(struct task_struct *task) |
781 | { | |
756d17ee | 782 | if (list_empty(&ftrace_pids)) |
804a6851 SR |
783 | return 1; |
784 | ||
785 | return test_tsk_trace_trace(task); | |
786 | } | |
e0a413f6 | 787 | extern int ftrace_is_dead(void); |
1155de47 PM |
788 | #else |
789 | static inline int ftrace_trace_task(struct task_struct *task) | |
790 | { | |
791 | return 1; | |
792 | } | |
e0a413f6 | 793 | static inline int ftrace_is_dead(void) { return 0; } |
1155de47 | 794 | #endif |
804a6851 | 795 | |
ced39002 JO |
796 | int ftrace_event_is_function(struct ftrace_event_call *call); |
797 | ||
b63f39ea | 798 | /* |
799 | * struct trace_parser - servers for reading the user input separated by spaces | |
800 | * @cont: set if the input is not complete - no final space char was found | |
801 | * @buffer: holds the parsed user input | |
1537a363 | 802 | * @idx: user input length |
b63f39ea | 803 | * @size: buffer size |
804 | */ | |
805 | struct trace_parser { | |
806 | bool cont; | |
807 | char *buffer; | |
808 | unsigned idx; | |
809 | unsigned size; | |
810 | }; | |
811 | ||
812 | static inline bool trace_parser_loaded(struct trace_parser *parser) | |
813 | { | |
814 | return (parser->idx != 0); | |
815 | } | |
816 | ||
817 | static inline bool trace_parser_cont(struct trace_parser *parser) | |
818 | { | |
819 | return parser->cont; | |
820 | } | |
821 | ||
822 | static inline void trace_parser_clear(struct trace_parser *parser) | |
823 | { | |
824 | parser->cont = false; | |
825 | parser->idx = 0; | |
826 | } | |
827 | ||
828 | extern int trace_parser_get_init(struct trace_parser *parser, int size); | |
829 | extern void trace_parser_put(struct trace_parser *parser); | |
830 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
831 | size_t cnt, loff_t *ppos); | |
832 | ||
4fcdae83 SR |
833 | /* |
834 | * trace_iterator_flags is an enumeration that defines bit | |
835 | * positions into trace_flags that controls the output. | |
836 | * | |
837 | * NOTE: These bits must match the trace_options array in | |
838 | * trace.c. | |
839 | */ | |
4e655519 IM |
840 | enum trace_iterator_flags { |
841 | TRACE_ITER_PRINT_PARENT = 0x01, | |
842 | TRACE_ITER_SYM_OFFSET = 0x02, | |
843 | TRACE_ITER_SYM_ADDR = 0x04, | |
844 | TRACE_ITER_VERBOSE = 0x08, | |
845 | TRACE_ITER_RAW = 0x10, | |
846 | TRACE_ITER_HEX = 0x20, | |
847 | TRACE_ITER_BIN = 0x40, | |
848 | TRACE_ITER_BLOCK = 0x80, | |
849 | TRACE_ITER_STACKTRACE = 0x100, | |
2cbafd68 LZ |
850 | TRACE_ITER_PRINTK = 0x200, |
851 | TRACE_ITER_PREEMPTONLY = 0x400, | |
852 | TRACE_ITER_BRANCH = 0x800, | |
853 | TRACE_ITER_ANNOTATE = 0x1000, | |
854 | TRACE_ITER_USERSTACKTRACE = 0x2000, | |
855 | TRACE_ITER_SYM_USEROBJ = 0x4000, | |
856 | TRACE_ITER_PRINTK_MSGONLY = 0x8000, | |
857 | TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */ | |
858 | TRACE_ITER_LATENCY_FMT = 0x20000, | |
859 | TRACE_ITER_SLEEP_TIME = 0x40000, | |
860 | TRACE_ITER_GRAPH_TIME = 0x80000, | |
e870e9a1 | 861 | TRACE_ITER_RECORD_CMD = 0x100000, |
750912fa | 862 | TRACE_ITER_OVERWRITE = 0x200000, |
cf30cf67 | 863 | TRACE_ITER_STOP_ON_FREE = 0x400000, |
77271ce4 | 864 | TRACE_ITER_IRQ_INFO = 0x800000, |
5224c3a3 | 865 | TRACE_ITER_MARKERS = 0x1000000, |
328df475 | 866 | TRACE_ITER_FUNCTION = 0x2000000, |
4e655519 IM |
867 | }; |
868 | ||
15e6cb36 FW |
869 | /* |
870 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
871 | * control the output of kernel symbols. | |
872 | */ | |
873 | #define TRACE_ITER_SYM_MASK \ | |
874 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
875 | ||
43a15386 FW |
876 | extern struct tracer nop_trace; |
877 | ||
2ed84eeb | 878 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
879 | extern int enable_branch_tracing(struct trace_array *tr); |
880 | extern void disable_branch_tracing(void); | |
881 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 882 | { |
9f029e83 SR |
883 | if (trace_flags & TRACE_ITER_BRANCH) |
884 | return enable_branch_tracing(tr); | |
52f232cb SR |
885 | return 0; |
886 | } | |
9f029e83 | 887 | static inline void trace_branch_disable(void) |
52f232cb SR |
888 | { |
889 | /* due to races, always disable */ | |
9f029e83 | 890 | disable_branch_tracing(); |
52f232cb SR |
891 | } |
892 | #else | |
9f029e83 | 893 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
894 | { |
895 | return 0; | |
896 | } | |
9f029e83 | 897 | static inline void trace_branch_disable(void) |
52f232cb SR |
898 | { |
899 | } | |
2ed84eeb | 900 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 901 | |
1852fcce SR |
902 | /* set ring buffers to default size if not already done so */ |
903 | int tracing_update_buffers(void); | |
904 | ||
cf027f64 TZ |
905 | struct ftrace_event_field { |
906 | struct list_head link; | |
92edca07 SR |
907 | const char *name; |
908 | const char *type; | |
aa38e9fc | 909 | int filter_type; |
cf027f64 TZ |
910 | int offset; |
911 | int size; | |
a118e4d1 | 912 | int is_signed; |
cf027f64 TZ |
913 | }; |
914 | ||
30e673b2 | 915 | struct event_filter { |
c9c53ca0 SR |
916 | int n_preds; /* Number assigned */ |
917 | int a_preds; /* allocated */ | |
74e9e58c | 918 | struct filter_pred *preds; |
61e9dea2 | 919 | struct filter_pred *root; |
8b372562 | 920 | char *filter_string; |
30e673b2 TZ |
921 | }; |
922 | ||
cfb180f3 TZ |
923 | struct event_subsystem { |
924 | struct list_head list; | |
925 | const char *name; | |
1f9963cb | 926 | struct event_filter *filter; |
e9dbfae5 | 927 | int ref_count; |
cfb180f3 TZ |
928 | }; |
929 | ||
ae63b31e SR |
930 | struct ftrace_subsystem_dir { |
931 | struct list_head list; | |
932 | struct event_subsystem *subsystem; | |
933 | struct trace_array *tr; | |
934 | struct dentry *entry; | |
935 | int ref_count; | |
936 | int nr_events; | |
937 | }; | |
938 | ||
61e9dea2 SR |
939 | #define FILTER_PRED_INVALID ((unsigned short)-1) |
940 | #define FILTER_PRED_IS_RIGHT (1 << 15) | |
43cd4145 | 941 | #define FILTER_PRED_FOLD (1 << 15) |
61e9dea2 | 942 | |
bf93f9ed SR |
943 | /* |
944 | * The max preds is the size of unsigned short with | |
945 | * two flags at the MSBs. One bit is used for both the IS_RIGHT | |
946 | * and FOLD flags. The other is reserved. | |
947 | * | |
948 | * 2^14 preds is way more than enough. | |
949 | */ | |
950 | #define MAX_FILTER_PRED 16384 | |
4a3d27e9 | 951 | |
7ce7e424 | 952 | struct filter_pred; |
1889d209 | 953 | struct regex; |
7ce7e424 | 954 | |
58d9a597 | 955 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); |
7ce7e424 | 956 | |
1889d209 FW |
957 | typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
958 | ||
3f6fe06d | 959 | enum regex_type { |
b0f1a59a | 960 | MATCH_FULL = 0, |
3f6fe06d FW |
961 | MATCH_FRONT_ONLY, |
962 | MATCH_MIDDLE_ONLY, | |
963 | MATCH_END_ONLY, | |
964 | }; | |
965 | ||
1889d209 FW |
966 | struct regex { |
967 | char pattern[MAX_FILTER_STR_VAL]; | |
968 | int len; | |
969 | int field_len; | |
970 | regex_match_func match; | |
971 | }; | |
972 | ||
7ce7e424 | 973 | struct filter_pred { |
1889d209 FW |
974 | filter_pred_fn_t fn; |
975 | u64 val; | |
976 | struct regex regex; | |
61aaef55 | 977 | unsigned short *ops; |
1d0e78e3 | 978 | struct ftrace_event_field *field; |
1889d209 FW |
979 | int offset; |
980 | int not; | |
981 | int op; | |
61e9dea2 SR |
982 | unsigned short index; |
983 | unsigned short parent; | |
984 | unsigned short left; | |
985 | unsigned short right; | |
7ce7e424 TZ |
986 | }; |
987 | ||
3f6fe06d FW |
988 | extern enum regex_type |
989 | filter_parse_regex(char *buff, int len, char **search, int *not); | |
8b372562 | 990 | extern void print_event_filter(struct ftrace_event_call *call, |
4bda2d51 | 991 | struct trace_seq *s); |
8b372562 TZ |
992 | extern int apply_event_filter(struct ftrace_event_call *call, |
993 | char *filter_string); | |
ae63b31e | 994 | extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir, |
8b372562 TZ |
995 | char *filter_string); |
996 | extern void print_subsystem_event_filter(struct event_subsystem *system, | |
ac1adc55 | 997 | struct trace_seq *s); |
aa38e9fc | 998 | extern int filter_assign_type(const char *type); |
7ce7e424 | 999 | |
b3a8c6fd J |
1000 | struct ftrace_event_field * |
1001 | trace_find_event_field(struct ftrace_event_call *call, char *name); | |
2e33af02 | 1002 | |
eb02ce01 | 1003 | static inline int |
e1112b4d | 1004 | filter_check_discard(struct ftrace_event_call *call, void *rec, |
eb02ce01 | 1005 | struct ring_buffer *buffer, |
e1112b4d TZ |
1006 | struct ring_buffer_event *event) |
1007 | { | |
553552ce | 1008 | if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && |
6fb2915d | 1009 | !filter_match_preds(call->filter, rec)) { |
eb02ce01 TZ |
1010 | ring_buffer_discard_commit(buffer, event); |
1011 | return 1; | |
1012 | } | |
1013 | ||
1014 | return 0; | |
e1112b4d TZ |
1015 | } |
1016 | ||
e870e9a1 | 1017 | extern void trace_event_enable_cmd_record(bool enable); |
277ba044 | 1018 | extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); |
0c8916c3 | 1019 | extern int event_trace_del_tracer(struct trace_array *tr); |
e870e9a1 | 1020 | |
20c8928a | 1021 | extern struct mutex event_mutex; |
a59fd602 | 1022 | extern struct list_head ftrace_events; |
ac199db0 | 1023 | |
e9fb2b6d SR |
1024 | extern const char *__start___trace_bprintk_fmt[]; |
1025 | extern const char *__stop___trace_bprintk_fmt[]; | |
1026 | ||
102c9323 SRRH |
1027 | extern const char *__start___tracepoint_str[]; |
1028 | extern const char *__stop___tracepoint_str[]; | |
1029 | ||
07d777fe | 1030 | void trace_printk_init_buffers(void); |
81698831 | 1031 | void trace_printk_start_comm(void); |
613f04a0 | 1032 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); |
2b6080f2 | 1033 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); |
07d777fe | 1034 | |
ca268da6 SRRH |
1035 | /* |
1036 | * Normal trace_printk() and friends allocates special buffers | |
1037 | * to do the manipulation, as well as saves the print formats | |
1038 | * into sections to display. But the trace infrastructure wants | |
1039 | * to use these without the added overhead at the price of being | |
1040 | * a bit slower (used mainly for warnings, where we don't care | |
1041 | * about performance). The internal_trace_puts() is for such | |
1042 | * a purpose. | |
1043 | */ | |
1044 | #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) | |
1045 | ||
4e5292ea | 1046 | #undef FTRACE_ENTRY |
02aa3162 | 1047 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ |
86c38a31 JM |
1048 | extern struct ftrace_event_call \ |
1049 | __attribute__((__aligned__(4))) event_##call; | |
4e5292ea | 1050 | #undef FTRACE_ENTRY_DUP |
02aa3162 JO |
1051 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ |
1052 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
1053 | filter) | |
4e5292ea | 1054 | #include "trace_entries.h" |
e1112b4d | 1055 | |
6e48b550 | 1056 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) |
ced39002 JO |
1057 | int perf_ftrace_event_register(struct ftrace_event_call *call, |
1058 | enum trace_reg type, void *data); | |
1059 | #else | |
1060 | #define perf_ftrace_event_register NULL | |
6e48b550 | 1061 | #endif |
ced39002 | 1062 | |
bc0c38d1 | 1063 | #endif /* _LINUX_KERNEL_TRACE_H */ |