Commit | Line | Data |
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bac5fb97 | 1 | |
bc0c38d1 SR |
2 | #ifndef _LINUX_KERNEL_TRACE_H |
3 | #define _LINUX_KERNEL_TRACE_H | |
4 | ||
5 | #include <linux/fs.h> | |
60063497 | 6 | #include <linux/atomic.h> |
bc0c38d1 SR |
7 | #include <linux/sched.h> |
8 | #include <linux/clocksource.h> | |
3928a8a2 | 9 | #include <linux/ring_buffer.h> |
bd8ac686 | 10 | #include <linux/mmiotrace.h> |
4e5292ea | 11 | #include <linux/tracepoint.h> |
d13744cd | 12 | #include <linux/ftrace.h> |
24f1e32c | 13 | #include <linux/hw_breakpoint.h> |
9504504c | 14 | #include <linux/trace_seq.h> |
af658dca | 15 | #include <linux/trace_events.h> |
52f5684c | 16 | #include <linux/compiler.h> |
19a7fe20 | 17 | #include <linux/trace_seq.h> |
9504504c | 18 | |
12ab74ee SR |
19 | #ifdef CONFIG_FTRACE_SYSCALLS |
20 | #include <asm/unistd.h> /* For NR_SYSCALLS */ | |
21 | #include <asm/syscall.h> /* some archs define it here */ | |
22 | #endif | |
23 | ||
72829bc3 TG |
24 | enum trace_type { |
25 | __TRACE_FIRST_TYPE = 0, | |
26 | ||
27 | TRACE_FN, | |
28 | TRACE_CTX, | |
29 | TRACE_WAKE, | |
30 | TRACE_STACK, | |
dd0e545f | 31 | TRACE_PRINT, |
48ead020 | 32 | TRACE_BPRINT, |
bd8ac686 PP |
33 | TRACE_MMIO_RW, |
34 | TRACE_MMIO_MAP, | |
9f029e83 | 35 | TRACE_BRANCH, |
287b6e68 FW |
36 | TRACE_GRAPH_RET, |
37 | TRACE_GRAPH_ENT, | |
02b67518 | 38 | TRACE_USER_STACK, |
c71a8961 | 39 | TRACE_BLK, |
09ae7234 | 40 | TRACE_BPUTS, |
72829bc3 | 41 | |
f0868d1e | 42 | __TRACE_LAST_TYPE, |
72829bc3 TG |
43 | }; |
44 | ||
bc0c38d1 | 45 | |
0a1c49db SR |
46 | #undef __field |
47 | #define __field(type, item) type item; | |
86387f7e | 48 | |
d7315094 SR |
49 | #undef __field_struct |
50 | #define __field_struct(type, item) __field(type, item) | |
86387f7e | 51 | |
d7315094 SR |
52 | #undef __field_desc |
53 | #define __field_desc(type, container, item) | |
02b67518 | 54 | |
0a1c49db SR |
55 | #undef __array |
56 | #define __array(type, item, size) type item[size]; | |
1427cdf0 | 57 | |
d7315094 SR |
58 | #undef __array_desc |
59 | #define __array_desc(type, container, item, size) | |
777e208d | 60 | |
0a1c49db SR |
61 | #undef __dynamic_array |
62 | #define __dynamic_array(type, item) type item[]; | |
777e208d | 63 | |
0a1c49db SR |
64 | #undef F_STRUCT |
65 | #define F_STRUCT(args...) args | |
74239072 | 66 | |
0a1c49db | 67 | #undef FTRACE_ENTRY |
02aa3162 JO |
68 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
69 | struct struct_name { \ | |
70 | struct trace_entry ent; \ | |
71 | tstruct \ | |
0a1c49db | 72 | } |
777e208d | 73 | |
0a1c49db SR |
74 | #undef TP_ARGS |
75 | #define TP_ARGS(args...) args | |
52f232cb | 76 | |
0a1c49db | 77 | #undef FTRACE_ENTRY_DUP |
02aa3162 | 78 | #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) |
1e9b51c2 | 79 | |
e59a0bff | 80 | #undef FTRACE_ENTRY_REG |
02aa3162 JO |
81 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ |
82 | filter, regfn) \ | |
83 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
84 | filter) | |
e59a0bff | 85 | |
0a1c49db | 86 | #include "trace_entries.h" |
36994e58 | 87 | |
0a1c49db SR |
88 | /* |
89 | * syscalls are special, and need special handling, this is why | |
90 | * they are not included in trace_entries.h | |
91 | */ | |
bed1ffca FW |
92 | struct syscall_trace_enter { |
93 | struct trace_entry ent; | |
94 | int nr; | |
95 | unsigned long args[]; | |
96 | }; | |
97 | ||
98 | struct syscall_trace_exit { | |
99 | struct trace_entry ent; | |
100 | int nr; | |
99df5a6a | 101 | long ret; |
bed1ffca FW |
102 | }; |
103 | ||
93ccae7a | 104 | struct kprobe_trace_entry_head { |
413d37d1 MH |
105 | struct trace_entry ent; |
106 | unsigned long ip; | |
413d37d1 MH |
107 | }; |
108 | ||
93ccae7a | 109 | struct kretprobe_trace_entry_head { |
413d37d1 MH |
110 | struct trace_entry ent; |
111 | unsigned long func; | |
112 | unsigned long ret_ip; | |
413d37d1 MH |
113 | }; |
114 | ||
fc5e27ae PP |
115 | /* |
116 | * trace_flag_type is an enumeration that holds different | |
117 | * states when a trace occurs. These are: | |
9244489a | 118 | * IRQS_OFF - interrupts were disabled |
9de36825 | 119 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
bd9cfca9 | 120 | * NEED_RESCHED - reschedule is requested |
9244489a SR |
121 | * HARDIRQ - inside an interrupt handler |
122 | * SOFTIRQ - inside a softirq handler | |
fc5e27ae PP |
123 | */ |
124 | enum trace_flag_type { | |
125 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
126 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
127 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
128 | TRACE_FLAG_HARDIRQ = 0x08, | |
129 | TRACE_FLAG_SOFTIRQ = 0x10, | |
e5137b50 | 130 | TRACE_FLAG_PREEMPT_RESCHED = 0x20, |
fc5e27ae PP |
131 | }; |
132 | ||
5bf9a1ee | 133 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 | 134 | |
2b6080f2 SR |
135 | struct trace_array; |
136 | ||
bc0c38d1 SR |
137 | /* |
138 | * The CPU trace array - it consists of thousands of trace entries | |
139 | * plus some other descriptor data: (for example which task started | |
140 | * the trace, etc.) | |
141 | */ | |
142 | struct trace_array_cpu { | |
bc0c38d1 | 143 | atomic_t disabled; |
2cadf913 | 144 | void *buffer_page; /* ring buffer spare */ |
4e3c3333 | 145 | |
438ced17 | 146 | unsigned long entries; |
bc0c38d1 SR |
147 | unsigned long saved_latency; |
148 | unsigned long critical_start; | |
149 | unsigned long critical_end; | |
150 | unsigned long critical_sequence; | |
151 | unsigned long nice; | |
152 | unsigned long policy; | |
153 | unsigned long rt_priority; | |
2f26ebd5 | 154 | unsigned long skipped_entries; |
bc0c38d1 SR |
155 | cycle_t preempt_timestamp; |
156 | pid_t pid; | |
d20b92ab | 157 | kuid_t uid; |
bc0c38d1 SR |
158 | char comm[TASK_COMM_LEN]; |
159 | }; | |
160 | ||
2b6080f2 SR |
161 | struct tracer; |
162 | ||
12883efb SRRH |
163 | struct trace_buffer { |
164 | struct trace_array *tr; | |
165 | struct ring_buffer *buffer; | |
166 | struct trace_array_cpu __percpu *data; | |
167 | cycle_t time_start; | |
168 | int cpu; | |
169 | }; | |
170 | ||
bc0c38d1 SR |
171 | /* |
172 | * The trace array - an array of per-CPU trace arrays. This is the | |
173 | * highest level data structure that individual tracers deal with. | |
174 | * They have on/off state as well: | |
175 | */ | |
176 | struct trace_array { | |
ae63b31e | 177 | struct list_head list; |
277ba044 | 178 | char *name; |
12883efb SRRH |
179 | struct trace_buffer trace_buffer; |
180 | #ifdef CONFIG_TRACER_MAX_TRACE | |
181 | /* | |
182 | * The max_buffer is used to snapshot the trace when a maximum | |
183 | * latency is reached, or when the user initiates a snapshot. | |
184 | * Some tracers will use this to store a maximum trace while | |
185 | * it continues examining live traces. | |
186 | * | |
187 | * The buffers for the max_buffer are set up the same as the trace_buffer | |
188 | * When a snapshot is taken, the buffer of the max_buffer is swapped | |
189 | * with the buffer of the trace_buffer and the buffers are reset for | |
190 | * the trace_buffer so the tracing can continue. | |
191 | */ | |
192 | struct trace_buffer max_buffer; | |
45ad21ca | 193 | bool allocated_snapshot; |
6d9b3fa5 | 194 | unsigned long max_latency; |
12883efb | 195 | #endif |
0b9b12c1 SRRH |
196 | /* |
197 | * max_lock is used to protect the swapping of buffers | |
198 | * when taking a max snapshot. The buffers themselves are | |
199 | * protected by per_cpu spinlocks. But the action of the swap | |
200 | * needs its own lock. | |
201 | * | |
202 | * This is defined as a arch_spinlock_t in order to help | |
203 | * with performance when lockdep debugging is enabled. | |
204 | * | |
205 | * It is also used in other places outside the update_max_tr | |
206 | * so it needs to be defined outside of the | |
207 | * CONFIG_TRACER_MAX_TRACE. | |
208 | */ | |
209 | arch_spinlock_t max_lock; | |
499e5470 | 210 | int buffer_disabled; |
12ab74ee SR |
211 | #ifdef CONFIG_FTRACE_SYSCALLS |
212 | int sys_refcount_enter; | |
213 | int sys_refcount_exit; | |
7f1d2f82 SRRH |
214 | struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; |
215 | struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; | |
12ab74ee | 216 | #endif |
2b6080f2 SR |
217 | int stop_count; |
218 | int clock_id; | |
219 | struct tracer *current_trace; | |
ae63b31e | 220 | unsigned int flags; |
2b6080f2 | 221 | raw_spinlock_t start_lock; |
ae63b31e | 222 | struct dentry *dir; |
2b6080f2 SR |
223 | struct dentry *options; |
224 | struct dentry *percpu_dir; | |
ae63b31e SR |
225 | struct dentry *event_dir; |
226 | struct list_head systems; | |
227 | struct list_head events; | |
ccfe9e42 | 228 | cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
a695cb58 | 229 | int ref; |
f20a5806 SRRH |
230 | #ifdef CONFIG_FUNCTION_TRACER |
231 | struct ftrace_ops *ops; | |
232 | /* function tracing enabled */ | |
233 | int function_enabled; | |
234 | #endif | |
bc0c38d1 SR |
235 | }; |
236 | ||
ae63b31e SR |
237 | enum { |
238 | TRACE_ARRAY_FL_GLOBAL = (1 << 0) | |
239 | }; | |
240 | ||
241 | extern struct list_head ftrace_trace_arrays; | |
242 | ||
a8227415 AL |
243 | extern struct mutex trace_types_lock; |
244 | ||
8e2e2fa4 SRRH |
245 | extern int trace_array_get(struct trace_array *tr); |
246 | extern void trace_array_put(struct trace_array *tr); | |
247 | ||
ae63b31e SR |
248 | /* |
249 | * The global tracer (top) should be the first trace array added, | |
250 | * but we check the flag anyway. | |
251 | */ | |
252 | static inline struct trace_array *top_trace_array(void) | |
253 | { | |
254 | struct trace_array *tr; | |
255 | ||
da9c3413 | 256 | if (list_empty(&ftrace_trace_arrays)) |
dc81e5e3 YY |
257 | return NULL; |
258 | ||
ae63b31e SR |
259 | tr = list_entry(ftrace_trace_arrays.prev, |
260 | typeof(*tr), list); | |
261 | WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); | |
262 | return tr; | |
263 | } | |
264 | ||
7104f300 SR |
265 | #define FTRACE_CMP_TYPE(var, type) \ |
266 | __builtin_types_compatible_p(typeof(var), type *) | |
267 | ||
268 | #undef IF_ASSIGN | |
269 | #define IF_ASSIGN(var, entry, etype, id) \ | |
270 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
271 | var = (typeof(var))(entry); \ | |
272 | WARN_ON(id && (entry)->type != id); \ | |
273 | break; \ | |
274 | } | |
275 | ||
276 | /* Will cause compile errors if type is not found. */ | |
277 | extern void __ftrace_bad_type(void); | |
278 | ||
279 | /* | |
280 | * The trace_assign_type is a verifier that the entry type is | |
281 | * the same as the type being assigned. To add new types simply | |
282 | * add a line with the following format: | |
283 | * | |
284 | * IF_ASSIGN(var, ent, type, id); | |
285 | * | |
286 | * Where "type" is the trace type that includes the trace_entry | |
287 | * as the "ent" item. And "id" is the trace identifier that is | |
288 | * used in the trace_type enum. | |
289 | * | |
290 | * If the type can have more than one id, then use zero. | |
291 | */ | |
292 | #define trace_assign_type(var, ent) \ | |
293 | do { \ | |
294 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
295 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 296 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 297 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 298 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 299 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
09ae7234 | 300 | IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ |
7104f300 SR |
301 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
302 | TRACE_MMIO_RW); \ | |
303 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
304 | TRACE_MMIO_MAP); \ | |
9f029e83 | 305 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
306 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
307 | TRACE_GRAPH_ENT); \ | |
308 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
309 | TRACE_GRAPH_RET); \ | |
7104f300 SR |
310 | __ftrace_bad_type(); \ |
311 | } while (0) | |
2c4f035f | 312 | |
adf9f195 FW |
313 | /* |
314 | * An option specific to a tracer. This is a boolean value. | |
315 | * The bit is the bit index that sets its value on the | |
316 | * flags value in struct tracer_flags. | |
317 | */ | |
318 | struct tracer_opt { | |
9de36825 IM |
319 | const char *name; /* Will appear on the trace_options file */ |
320 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
321 | }; |
322 | ||
323 | /* | |
324 | * The set of specific options for a tracer. Your tracer | |
325 | * have to set the initial value of the flags val. | |
326 | */ | |
327 | struct tracer_flags { | |
328 | u32 val; | |
9de36825 | 329 | struct tracer_opt *opts; |
adf9f195 FW |
330 | }; |
331 | ||
332 | /* Makes more easy to define a tracer opt */ | |
333 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
334 | ||
034939b6 | 335 | |
41d9c0be SRRH |
336 | struct trace_option_dentry { |
337 | struct tracer_opt *opt; | |
338 | struct tracer_flags *flags; | |
339 | struct trace_array *tr; | |
340 | struct dentry *entry; | |
341 | }; | |
342 | ||
6eaaa5d5 | 343 | /** |
8434dc93 | 344 | * struct tracer - a specific tracer and its callbacks to interact with tracefs |
6eaaa5d5 FW |
345 | * @name: the name chosen to select it on the available_tracers file |
346 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
347 | * @reset: called when one switches to another tracer | |
348 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled) | |
349 | * @stop: called when tracing is paused (echo 0 > tracing_enabled) | |
6508fa76 | 350 | * @update_thresh: called when tracing_thresh is updated |
6eaaa5d5 FW |
351 | * @open: called when the trace file is opened |
352 | * @pipe_open: called when the trace_pipe file is opened | |
6eaaa5d5 | 353 | * @close: called when the trace file is released |
c521efd1 | 354 | * @pipe_close: called when the trace_pipe file is released |
6eaaa5d5 FW |
355 | * @read: override the default read callback on trace_pipe |
356 | * @splice_read: override the default splice_read callback on trace_pipe | |
357 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
358 | * @print_headers: override the first lines that describe your columns | |
359 | * @print_line: callback that prints a trace | |
360 | * @set_flag: signals one of your private flags changed (trace_options file) | |
361 | * @flags: your private flags | |
bc0c38d1 SR |
362 | */ |
363 | struct tracer { | |
364 | const char *name; | |
1c80025a | 365 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 366 | void (*reset)(struct trace_array *tr); |
9036990d SR |
367 | void (*start)(struct trace_array *tr); |
368 | void (*stop)(struct trace_array *tr); | |
6508fa76 | 369 | int (*update_thresh)(struct trace_array *tr); |
bc0c38d1 | 370 | void (*open)(struct trace_iterator *iter); |
107bad8b | 371 | void (*pipe_open)(struct trace_iterator *iter); |
bc0c38d1 | 372 | void (*close)(struct trace_iterator *iter); |
c521efd1 | 373 | void (*pipe_close)(struct trace_iterator *iter); |
107bad8b SR |
374 | ssize_t (*read)(struct trace_iterator *iter, |
375 | struct file *filp, char __user *ubuf, | |
376 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
377 | ssize_t (*splice_read)(struct trace_iterator *iter, |
378 | struct file *filp, | |
379 | loff_t *ppos, | |
380 | struct pipe_inode_info *pipe, | |
381 | size_t len, | |
382 | unsigned int flags); | |
60a11774 SR |
383 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
384 | int (*selftest)(struct tracer *trace, | |
385 | struct trace_array *tr); | |
386 | #endif | |
8bba1bf5 | 387 | void (*print_header)(struct seq_file *m); |
2c4f035f | 388 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 | 389 | /* If you handled the flag setting, return 0 */ |
8c1a49ae SRRH |
390 | int (*set_flag)(struct trace_array *tr, |
391 | u32 old_flags, u32 bit, int set); | |
613f04a0 | 392 | /* Return 0 if OK with change, else return non-zero */ |
bf6065b5 | 393 | int (*flag_changed)(struct trace_array *tr, |
613f04a0 | 394 | u32 mask, int set); |
bc0c38d1 | 395 | struct tracer *next; |
9de36825 | 396 | struct tracer_flags *flags; |
41d9c0be | 397 | struct trace_option_dentry *topts; |
50512ab5 | 398 | int enabled; |
cf6ab6d9 | 399 | int ref; |
f43c738b | 400 | bool print_max; |
607e2ea1 | 401 | bool allow_instances; |
12883efb | 402 | #ifdef CONFIG_TRACER_MAX_TRACE |
f43c738b | 403 | bool use_max_tr; |
12883efb | 404 | #endif |
bc0c38d1 SR |
405 | }; |
406 | ||
f9520750 | 407 | |
e4a3f541 | 408 | /* Only current can touch trace_recursion */ |
e4a3f541 | 409 | |
edc15caf SR |
410 | /* |
411 | * For function tracing recursion: | |
412 | * The order of these bits are important. | |
413 | * | |
414 | * When function tracing occurs, the following steps are made: | |
415 | * If arch does not support a ftrace feature: | |
416 | * call internal function (uses INTERNAL bits) which calls... | |
417 | * If callback is registered to the "global" list, the list | |
418 | * function is called and recursion checks the GLOBAL bits. | |
419 | * then this function calls... | |
420 | * The function callback, which can use the FTRACE bits to | |
421 | * check for recursion. | |
422 | * | |
423 | * Now if the arch does not suppport a feature, and it calls | |
424 | * the global list function which calls the ftrace callback | |
425 | * all three of these steps will do a recursion protection. | |
426 | * There's no reason to do one if the previous caller already | |
427 | * did. The recursion that we are protecting against will | |
428 | * go through the same steps again. | |
429 | * | |
430 | * To prevent the multiple recursion checks, if a recursion | |
431 | * bit is set that is higher than the MAX bit of the current | |
432 | * check, then we know that the check was made by the previous | |
433 | * caller, and we can skip the current check. | |
434 | */ | |
e46cbf75 | 435 | enum { |
567cd4da SR |
436 | TRACE_BUFFER_BIT, |
437 | TRACE_BUFFER_NMI_BIT, | |
438 | TRACE_BUFFER_IRQ_BIT, | |
439 | TRACE_BUFFER_SIRQ_BIT, | |
440 | ||
441 | /* Start of function recursion bits */ | |
442 | TRACE_FTRACE_BIT, | |
edc15caf SR |
443 | TRACE_FTRACE_NMI_BIT, |
444 | TRACE_FTRACE_IRQ_BIT, | |
445 | TRACE_FTRACE_SIRQ_BIT, | |
e46cbf75 | 446 | |
4104d326 | 447 | /* INTERNAL_BITs must be greater than FTRACE_BITs */ |
edc15caf SR |
448 | TRACE_INTERNAL_BIT, |
449 | TRACE_INTERNAL_NMI_BIT, | |
450 | TRACE_INTERNAL_IRQ_BIT, | |
451 | TRACE_INTERNAL_SIRQ_BIT, | |
452 | ||
e46cbf75 | 453 | TRACE_CONTROL_BIT, |
e248491a | 454 | |
6224beb1 | 455 | TRACE_BRANCH_BIT, |
e4a3f541 SR |
456 | /* |
457 | * Abuse of the trace_recursion. | |
458 | * As we need a way to maintain state if we are tracing the function | |
459 | * graph in irq because we want to trace a particular function that | |
460 | * was called in irq context but we have irq tracing off. Since this | |
461 | * can only be modified by current, we can reuse trace_recursion. | |
462 | */ | |
e46cbf75 SR |
463 | TRACE_IRQ_BIT, |
464 | }; | |
e4a3f541 | 465 | |
e46cbf75 SR |
466 | #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) |
467 | #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) | |
468 | #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) | |
e4a3f541 | 469 | |
edc15caf SR |
470 | #define TRACE_CONTEXT_BITS 4 |
471 | ||
472 | #define TRACE_FTRACE_START TRACE_FTRACE_BIT | |
473 | #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) | |
474 | ||
edc15caf SR |
475 | #define TRACE_LIST_START TRACE_INTERNAL_BIT |
476 | #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) | |
477 | ||
478 | #define TRACE_CONTEXT_MASK TRACE_LIST_MAX | |
479 | ||
480 | static __always_inline int trace_get_context_bit(void) | |
481 | { | |
482 | int bit; | |
483 | ||
484 | if (in_interrupt()) { | |
485 | if (in_nmi()) | |
486 | bit = 0; | |
487 | ||
488 | else if (in_irq()) | |
489 | bit = 1; | |
490 | else | |
491 | bit = 2; | |
492 | } else | |
493 | bit = 3; | |
494 | ||
495 | return bit; | |
496 | } | |
497 | ||
498 | static __always_inline int trace_test_and_set_recursion(int start, int max) | |
499 | { | |
500 | unsigned int val = current->trace_recursion; | |
501 | int bit; | |
502 | ||
503 | /* A previous recursion check was made */ | |
504 | if ((val & TRACE_CONTEXT_MASK) > max) | |
505 | return 0; | |
506 | ||
507 | bit = trace_get_context_bit() + start; | |
508 | if (unlikely(val & (1 << bit))) | |
509 | return -1; | |
510 | ||
511 | val |= 1 << bit; | |
512 | current->trace_recursion = val; | |
513 | barrier(); | |
514 | ||
515 | return bit; | |
516 | } | |
517 | ||
518 | static __always_inline void trace_clear_recursion(int bit) | |
519 | { | |
520 | unsigned int val = current->trace_recursion; | |
521 | ||
522 | if (!bit) | |
523 | return; | |
524 | ||
525 | bit = 1 << bit; | |
526 | val &= ~bit; | |
527 | ||
528 | barrier(); | |
529 | current->trace_recursion = val; | |
530 | } | |
531 | ||
6d158a81 SR |
532 | static inline struct ring_buffer_iter * |
533 | trace_buffer_iter(struct trace_iterator *iter, int cpu) | |
534 | { | |
535 | if (iter->buffer_iter && iter->buffer_iter[cpu]) | |
536 | return iter->buffer_iter[cpu]; | |
537 | return NULL; | |
538 | } | |
539 | ||
b6f11df2 | 540 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 541 | int tracing_is_enabled(void); |
12883efb SRRH |
542 | void tracing_reset(struct trace_buffer *buf, int cpu); |
543 | void tracing_reset_online_cpus(struct trace_buffer *buf); | |
9456f0fa | 544 | void tracing_reset_current(int cpu); |
873c642f | 545 | void tracing_reset_all_online_cpus(void); |
bc0c38d1 | 546 | int tracing_open_generic(struct inode *inode, struct file *filp); |
2e86421d | 547 | bool tracing_is_disabled(void); |
5452af66 | 548 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 549 | umode_t mode, |
5452af66 FW |
550 | struct dentry *parent, |
551 | void *data, | |
552 | const struct file_operations *fops); | |
553 | ||
bc0c38d1 | 554 | struct dentry *tracing_init_dentry(void); |
d618b3e6 | 555 | |
51a763dd ACM |
556 | struct ring_buffer_event; |
557 | ||
e77405ad SR |
558 | struct ring_buffer_event * |
559 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
560 | int type, | |
561 | unsigned long len, | |
562 | unsigned long flags, | |
563 | int pc); | |
51a763dd | 564 | |
45dcd8b8 PP |
565 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
566 | struct trace_array_cpu *data); | |
c4a8e8be FW |
567 | |
568 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
569 | int *ent_cpu, u64 *ent_ts); | |
570 | ||
7ffbd48d SR |
571 | void __buffer_unlock_commit(struct ring_buffer *buffer, |
572 | struct ring_buffer_event *event); | |
573 | ||
955b61e5 JW |
574 | int trace_empty(struct trace_iterator *iter); |
575 | ||
576 | void *trace_find_next_entry_inc(struct trace_iterator *iter); | |
577 | ||
578 | void trace_init_global_iter(struct trace_iterator *iter); | |
579 | ||
580 | void tracing_iter_reset(struct trace_iterator *iter, int cpu); | |
581 | ||
6fb44b71 | 582 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
583 | unsigned long ip, |
584 | unsigned long parent_ip, | |
38697053 | 585 | unsigned long flags, int pc); |
0a772620 JO |
586 | void trace_graph_function(struct trace_array *tr, |
587 | unsigned long ip, | |
588 | unsigned long parent_ip, | |
589 | unsigned long flags, int pc); | |
7e9a49ef | 590 | void trace_latency_header(struct seq_file *m); |
62b915f1 JO |
591 | void trace_default_header(struct seq_file *m); |
592 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter); | |
593 | int trace_empty(struct trace_iterator *iter); | |
bc0c38d1 | 594 | |
287b6e68 | 595 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 596 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1a0799a8 | 597 | void set_graph_array(struct trace_array *tr); |
1e9b51c2 | 598 | |
41bc8144 SR |
599 | void tracing_start_cmdline_record(void); |
600 | void tracing_stop_cmdline_record(void); | |
bc0c38d1 | 601 | int register_tracer(struct tracer *type); |
b5130b1e | 602 | int is_tracing_stopped(void); |
955b61e5 | 603 | |
098c879e SRRH |
604 | loff_t tracing_lseek(struct file *file, loff_t offset, int whence); |
605 | ||
955b61e5 JW |
606 | extern cpumask_var_t __read_mostly tracing_buffer_mask; |
607 | ||
608 | #define for_each_tracing_cpu(cpu) \ | |
609 | for_each_cpu(cpu, tracing_buffer_mask) | |
bc0c38d1 SR |
610 | |
611 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
612 | ||
0e950173 TB |
613 | extern unsigned long tracing_thresh; |
614 | ||
5d4a9dba | 615 | #ifdef CONFIG_TRACER_MAX_TRACE |
bc0c38d1 SR |
616 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); |
617 | void update_max_tr_single(struct trace_array *tr, | |
618 | struct task_struct *tsk, int cpu); | |
5d4a9dba | 619 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 620 | |
c0a0d0d3 | 621 | #ifdef CONFIG_STACKTRACE |
e77405ad | 622 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
623 | int pc); |
624 | ||
625 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, | |
626 | int pc); | |
627 | #else | |
e1f7992e | 628 | static inline void ftrace_trace_userstack(struct ring_buffer *buffer, |
c0a0d0d3 FW |
629 | unsigned long flags, int pc) |
630 | { | |
631 | } | |
632 | ||
633 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags, | |
634 | int skip, int pc) | |
635 | { | |
636 | } | |
637 | #endif /* CONFIG_STACKTRACE */ | |
53614991 | 638 | |
e309b41d | 639 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 640 | |
4ca53085 | 641 | extern void trace_find_cmdline(int pid, char comm[]); |
f7d48cbd | 642 | |
bc0c38d1 SR |
643 | #ifdef CONFIG_DYNAMIC_FTRACE |
644 | extern unsigned long ftrace_update_tot_cnt; | |
ad97772a | 645 | #endif |
d05cdb25 SR |
646 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
647 | extern int DYN_FTRACE_TEST_NAME(void); | |
95950c2e SR |
648 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 |
649 | extern int DYN_FTRACE_TEST_NAME2(void); | |
bc0c38d1 | 650 | |
55034cd6 | 651 | extern bool ring_buffer_expanded; |
020e5f85 | 652 | extern bool tracing_selftest_disabled; |
9288f99a | 653 | DECLARE_PER_CPU(int, ftrace_cpu_disabled); |
020e5f85 | 654 | |
60a11774 | 655 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
656 | extern int trace_selftest_startup_function(struct tracer *trace, |
657 | struct trace_array *tr); | |
7447dce9 FW |
658 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
659 | struct trace_array *tr); | |
60a11774 SR |
660 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
661 | struct trace_array *tr); | |
60a11774 SR |
662 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
663 | struct trace_array *tr); | |
60a11774 SR |
664 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
665 | struct trace_array *tr); | |
60a11774 SR |
666 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
667 | struct trace_array *tr); | |
fb1b6d8b SN |
668 | extern int trace_selftest_startup_nop(struct tracer *trace, |
669 | struct trace_array *tr); | |
60a11774 SR |
670 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
671 | struct trace_array *tr); | |
80e5ea45 SR |
672 | extern int trace_selftest_startup_branch(struct tracer *trace, |
673 | struct trace_array *tr); | |
8f768993 SRRH |
674 | /* |
675 | * Tracer data references selftest functions that only occur | |
676 | * on boot up. These can be __init functions. Thus, when selftests | |
677 | * are enabled, then the tracers need to reference __init functions. | |
678 | */ | |
679 | #define __tracer_data __refdata | |
680 | #else | |
681 | /* Tracers are seldom changed. Optimize when selftests are disabled. */ | |
682 | #define __tracer_data __read_mostly | |
60a11774 SR |
683 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
684 | ||
c7aafc54 | 685 | extern void *head_page(struct trace_array_cpu *data); |
cf8e3474 | 686 | extern unsigned long long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 687 | extern int |
40ce74f1 | 688 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 689 | extern int |
40ce74f1 | 690 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
659372d3 SR |
691 | extern int |
692 | trace_array_vprintk(struct trace_array *tr, | |
693 | unsigned long ip, const char *fmt, va_list args); | |
694 | int trace_array_printk(struct trace_array *tr, | |
695 | unsigned long ip, const char *fmt, ...); | |
12883efb SRRH |
696 | int trace_array_printk_buf(struct ring_buffer *buffer, |
697 | unsigned long ip, const char *fmt, ...); | |
955b61e5 JW |
698 | void trace_printk_seq(struct trace_seq *s); |
699 | enum print_line_t print_trace_line(struct trace_iterator *iter); | |
c7aafc54 | 700 | |
4e655519 IM |
701 | extern unsigned long trace_flags; |
702 | ||
8e1e1df2 BP |
703 | extern char trace_find_mark(unsigned long long duration); |
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 | |
ccdb5946 | 715 | #define TRACE_GRAPH_PRINT_IRQS 0x40 |
607e3a29 | 716 | #define TRACE_GRAPH_PRINT_TAIL 0x80 |
6fc84ea7 SRRH |
717 | #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 |
718 | #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) | |
62b915f1 | 719 | |
d7a8d9e9 JO |
720 | extern enum print_line_t |
721 | print_graph_function_flags(struct trace_iterator *iter, u32 flags); | |
722 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags); | |
9d9add34 | 723 | extern void |
0706f1c4 | 724 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); |
62b915f1 JO |
725 | extern void graph_trace_open(struct trace_iterator *iter); |
726 | extern void graph_trace_close(struct trace_iterator *iter); | |
727 | extern int __trace_graph_entry(struct trace_array *tr, | |
728 | struct ftrace_graph_ent *trace, | |
729 | unsigned long flags, int pc); | |
730 | extern void __trace_graph_return(struct trace_array *tr, | |
731 | struct ftrace_graph_ret *trace, | |
732 | unsigned long flags, int pc); | |
733 | ||
ea4e2bc4 SR |
734 | |
735 | #ifdef CONFIG_DYNAMIC_FTRACE | |
736 | /* TODO: make this variable */ | |
737 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
738 | extern int ftrace_graph_count; | |
739 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
29ad23b0 NK |
740 | extern int ftrace_graph_notrace_count; |
741 | extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
ea4e2bc4 SR |
742 | |
743 | static inline int ftrace_graph_addr(unsigned long addr) | |
744 | { | |
745 | int i; | |
746 | ||
9aa72b4b | 747 | if (!ftrace_graph_count) |
ea4e2bc4 SR |
748 | return 1; |
749 | ||
750 | for (i = 0; i < ftrace_graph_count; i++) { | |
e4a3f541 SR |
751 | if (addr == ftrace_graph_funcs[i]) { |
752 | /* | |
753 | * If no irqs are to be traced, but a set_graph_function | |
754 | * is set, and called by an interrupt handler, we still | |
755 | * want to trace it. | |
756 | */ | |
757 | if (in_irq()) | |
758 | trace_recursion_set(TRACE_IRQ_BIT); | |
759 | else | |
760 | trace_recursion_clear(TRACE_IRQ_BIT); | |
ea4e2bc4 | 761 | return 1; |
e4a3f541 | 762 | } |
ea4e2bc4 SR |
763 | } |
764 | ||
765 | return 0; | |
766 | } | |
29ad23b0 NK |
767 | |
768 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
769 | { | |
770 | int i; | |
771 | ||
772 | if (!ftrace_graph_notrace_count) | |
773 | return 0; | |
774 | ||
775 | for (i = 0; i < ftrace_graph_notrace_count; i++) { | |
776 | if (addr == ftrace_graph_notrace_funcs[i]) | |
777 | return 1; | |
778 | } | |
779 | ||
780 | return 0; | |
781 | } | |
15e6cb36 | 782 | #else |
6b253930 IM |
783 | static inline int ftrace_graph_addr(unsigned long addr) |
784 | { | |
785 | return 1; | |
ea4e2bc4 | 786 | } |
29ad23b0 NK |
787 | |
788 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
789 | { | |
790 | return 0; | |
791 | } | |
ea4e2bc4 | 792 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
ea4e2bc4 | 793 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 794 | static inline enum print_line_t |
d7a8d9e9 | 795 | print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
15e6cb36 FW |
796 | { |
797 | return TRACE_TYPE_UNHANDLED; | |
798 | } | |
ea4e2bc4 | 799 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 800 | |
756d17ee | 801 | extern struct list_head ftrace_pids; |
804a6851 | 802 | |
1155de47 | 803 | #ifdef CONFIG_FUNCTION_TRACER |
f1ed7c74 | 804 | extern bool ftrace_filter_param __initdata; |
804a6851 SR |
805 | static inline int ftrace_trace_task(struct task_struct *task) |
806 | { | |
756d17ee | 807 | if (list_empty(&ftrace_pids)) |
804a6851 SR |
808 | return 1; |
809 | ||
810 | return test_tsk_trace_trace(task); | |
811 | } | |
e0a413f6 | 812 | extern int ftrace_is_dead(void); |
591dffda SRRH |
813 | int ftrace_create_function_files(struct trace_array *tr, |
814 | struct dentry *parent); | |
815 | void ftrace_destroy_function_files(struct trace_array *tr); | |
4104d326 SRRH |
816 | void ftrace_init_global_array_ops(struct trace_array *tr); |
817 | void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); | |
818 | void ftrace_reset_array_ops(struct trace_array *tr); | |
7eea4fce | 819 | int using_ftrace_ops_list_func(void); |
1155de47 PM |
820 | #else |
821 | static inline int ftrace_trace_task(struct task_struct *task) | |
822 | { | |
823 | return 1; | |
824 | } | |
e0a413f6 | 825 | static inline int ftrace_is_dead(void) { return 0; } |
591dffda SRRH |
826 | static inline int |
827 | ftrace_create_function_files(struct trace_array *tr, | |
828 | struct dentry *parent) | |
829 | { | |
830 | return 0; | |
831 | } | |
832 | static inline void ftrace_destroy_function_files(struct trace_array *tr) { } | |
4104d326 SRRH |
833 | static inline __init void |
834 | ftrace_init_global_array_ops(struct trace_array *tr) { } | |
835 | static inline void ftrace_reset_array_ops(struct trace_array *tr) { } | |
836 | /* ftace_func_t type is not defined, use macro instead of static inline */ | |
837 | #define ftrace_init_array_ops(tr, func) do { } while (0) | |
591dffda SRRH |
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 | |
2425bcb9 | 853 | int ftrace_event_is_function(struct trace_event_call *call); |
ced39002 | 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 | ||
729358da SRRH |
890 | /* |
891 | * Only create function graph options if function graph is configured. | |
892 | */ | |
893 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
894 | # define FGRAPH_FLAGS \ | |
895 | C(SLEEP_TIME, "sleep-time"), \ | |
896 | C(GRAPH_TIME, "graph-time"), \ | |
897 | C(DISPLAY_GRAPH, "display-graph"), | |
898 | /* Initially set for trace_flags */ | |
899 | # define FUNCTION_GRAPH_DEFAULT_FLAGS \ | |
900 | (TRACE_ITER_SLEEP_TIME | TRACE_ITER_GRAPH_TIME) | |
901 | #else | |
902 | # define FGRAPH_FLAGS | |
903 | # define FUNCTION_GRAPH_DEFAULT_FLAGS 0UL | |
904 | #endif | |
905 | ||
4ee4301c SRRH |
906 | #ifdef CONFIG_BRANCH_TRACER |
907 | # define BRANCH_FLAGS \ | |
908 | C(BRANCH, "branch"), | |
909 | #else | |
910 | # define BRANCH_FLAGS | |
911 | #endif | |
912 | ||
8179e8a1 SRRH |
913 | #ifdef CONFIG_FUNCTION_TRACER |
914 | # define FUNCTION_FLAGS \ | |
915 | C(FUNCTION, "function-trace"), | |
916 | # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION | |
917 | #else | |
918 | # define FUNCTION_FLAGS | |
919 | # define FUNCTION_DEFAULT_FLAGS 0UL | |
920 | #endif | |
921 | ||
73dddbb5 SRRH |
922 | #ifdef CONFIG_STACKTRACE |
923 | # define STACK_FLAGS \ | |
924 | C(STACKTRACE, "stacktrace"), | |
925 | #else | |
926 | # define STACK_FLAGS | |
927 | #endif | |
928 | ||
4fcdae83 SR |
929 | /* |
930 | * trace_iterator_flags is an enumeration that defines bit | |
931 | * positions into trace_flags that controls the output. | |
932 | * | |
933 | * NOTE: These bits must match the trace_options array in | |
a3418a36 | 934 | * trace.c (this macro guarantees it). |
4fcdae83 | 935 | */ |
a3418a36 SRRH |
936 | #define TRACE_FLAGS \ |
937 | C(PRINT_PARENT, "print-parent"), \ | |
938 | C(SYM_OFFSET, "sym-offset"), \ | |
939 | C(SYM_ADDR, "sym-addr"), \ | |
940 | C(VERBOSE, "verbose"), \ | |
941 | C(RAW, "raw"), \ | |
942 | C(HEX, "hex"), \ | |
943 | C(BIN, "bin"), \ | |
944 | C(BLOCK, "block"), \ | |
a3418a36 | 945 | C(PRINTK, "trace_printk"), \ |
a3418a36 SRRH |
946 | C(ANNOTATE, "annotate"), \ |
947 | C(USERSTACKTRACE, "userstacktrace"), \ | |
948 | C(SYM_USEROBJ, "sym-userobj"), \ | |
949 | C(PRINTK_MSGONLY, "printk-msg-only"), \ | |
950 | C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ | |
951 | C(LATENCY_FMT, "latency-format"), \ | |
a3418a36 SRRH |
952 | C(RECORD_CMD, "record-cmd"), \ |
953 | C(OVERWRITE, "overwrite"), \ | |
954 | C(STOP_ON_FREE, "disable_on_free"), \ | |
955 | C(IRQ_INFO, "irq-info"), \ | |
956 | C(MARKERS, "markers"), \ | |
8179e8a1 | 957 | FUNCTION_FLAGS \ |
4ee4301c | 958 | FGRAPH_FLAGS \ |
73dddbb5 | 959 | STACK_FLAGS \ |
4ee4301c | 960 | BRANCH_FLAGS |
ce3fed62 | 961 | |
a3418a36 SRRH |
962 | /* |
963 | * By defining C, we can make TRACE_FLAGS a list of bit names | |
964 | * that will define the bits for the flag masks. | |
965 | */ | |
966 | #undef C | |
967 | #define C(a, b) TRACE_ITER_##a##_BIT | |
968 | ||
b5e87c05 SRRH |
969 | enum trace_iterator_bits { |
970 | TRACE_FLAGS | |
971 | /* Make sure we don't go more than we have bits for */ | |
972 | TRACE_ITER_LAST_BIT | |
973 | }; | |
a3418a36 SRRH |
974 | |
975 | /* | |
976 | * By redefining C, we can make TRACE_FLAGS a list of masks that | |
977 | * use the bits as defined above. | |
978 | */ | |
979 | #undef C | |
980 | #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) | |
981 | ||
982 | enum trace_iterator_flags { TRACE_FLAGS }; | |
4e655519 | 983 | |
15e6cb36 FW |
984 | /* |
985 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
986 | * control the output of kernel symbols. | |
987 | */ | |
988 | #define TRACE_ITER_SYM_MASK \ | |
989 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
990 | ||
43a15386 FW |
991 | extern struct tracer nop_trace; |
992 | ||
2ed84eeb | 993 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
994 | extern int enable_branch_tracing(struct trace_array *tr); |
995 | extern void disable_branch_tracing(void); | |
996 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 997 | { |
9f029e83 SR |
998 | if (trace_flags & TRACE_ITER_BRANCH) |
999 | return enable_branch_tracing(tr); | |
52f232cb SR |
1000 | return 0; |
1001 | } | |
9f029e83 | 1002 | static inline void trace_branch_disable(void) |
52f232cb SR |
1003 | { |
1004 | /* due to races, always disable */ | |
9f029e83 | 1005 | disable_branch_tracing(); |
52f232cb SR |
1006 | } |
1007 | #else | |
9f029e83 | 1008 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
1009 | { |
1010 | return 0; | |
1011 | } | |
9f029e83 | 1012 | static inline void trace_branch_disable(void) |
52f232cb SR |
1013 | { |
1014 | } | |
2ed84eeb | 1015 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 1016 | |
1852fcce SR |
1017 | /* set ring buffers to default size if not already done so */ |
1018 | int tracing_update_buffers(void); | |
1019 | ||
cf027f64 TZ |
1020 | struct ftrace_event_field { |
1021 | struct list_head link; | |
92edca07 SR |
1022 | const char *name; |
1023 | const char *type; | |
aa38e9fc | 1024 | int filter_type; |
cf027f64 TZ |
1025 | int offset; |
1026 | int size; | |
a118e4d1 | 1027 | int is_signed; |
cf027f64 TZ |
1028 | }; |
1029 | ||
30e673b2 | 1030 | struct event_filter { |
c9c53ca0 SR |
1031 | int n_preds; /* Number assigned */ |
1032 | int a_preds; /* allocated */ | |
74e9e58c | 1033 | struct filter_pred *preds; |
61e9dea2 | 1034 | struct filter_pred *root; |
8b372562 | 1035 | char *filter_string; |
30e673b2 TZ |
1036 | }; |
1037 | ||
cfb180f3 TZ |
1038 | struct event_subsystem { |
1039 | struct list_head list; | |
1040 | const char *name; | |
1f9963cb | 1041 | struct event_filter *filter; |
e9dbfae5 | 1042 | int ref_count; |
cfb180f3 TZ |
1043 | }; |
1044 | ||
7967b3e0 | 1045 | struct trace_subsystem_dir { |
ae63b31e SR |
1046 | struct list_head list; |
1047 | struct event_subsystem *subsystem; | |
1048 | struct trace_array *tr; | |
1049 | struct dentry *entry; | |
1050 | int ref_count; | |
1051 | int nr_events; | |
1052 | }; | |
1053 | ||
61e9dea2 SR |
1054 | #define FILTER_PRED_INVALID ((unsigned short)-1) |
1055 | #define FILTER_PRED_IS_RIGHT (1 << 15) | |
43cd4145 | 1056 | #define FILTER_PRED_FOLD (1 << 15) |
61e9dea2 | 1057 | |
bf93f9ed SR |
1058 | /* |
1059 | * The max preds is the size of unsigned short with | |
1060 | * two flags at the MSBs. One bit is used for both the IS_RIGHT | |
1061 | * and FOLD flags. The other is reserved. | |
1062 | * | |
1063 | * 2^14 preds is way more than enough. | |
1064 | */ | |
1065 | #define MAX_FILTER_PRED 16384 | |
4a3d27e9 | 1066 | |
7ce7e424 | 1067 | struct filter_pred; |
1889d209 | 1068 | struct regex; |
7ce7e424 | 1069 | |
58d9a597 | 1070 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); |
7ce7e424 | 1071 | |
1889d209 FW |
1072 | typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
1073 | ||
3f6fe06d | 1074 | enum regex_type { |
b0f1a59a | 1075 | MATCH_FULL = 0, |
3f6fe06d FW |
1076 | MATCH_FRONT_ONLY, |
1077 | MATCH_MIDDLE_ONLY, | |
1078 | MATCH_END_ONLY, | |
1079 | }; | |
1080 | ||
1889d209 FW |
1081 | struct regex { |
1082 | char pattern[MAX_FILTER_STR_VAL]; | |
1083 | int len; | |
1084 | int field_len; | |
1085 | regex_match_func match; | |
1086 | }; | |
1087 | ||
7ce7e424 | 1088 | struct filter_pred { |
1889d209 FW |
1089 | filter_pred_fn_t fn; |
1090 | u64 val; | |
1091 | struct regex regex; | |
61aaef55 | 1092 | unsigned short *ops; |
1d0e78e3 | 1093 | struct ftrace_event_field *field; |
1889d209 FW |
1094 | int offset; |
1095 | int not; | |
1096 | int op; | |
61e9dea2 SR |
1097 | unsigned short index; |
1098 | unsigned short parent; | |
1099 | unsigned short left; | |
1100 | unsigned short right; | |
7ce7e424 TZ |
1101 | }; |
1102 | ||
3f6fe06d FW |
1103 | extern enum regex_type |
1104 | filter_parse_regex(char *buff, int len, char **search, int *not); | |
7f1d2f82 | 1105 | extern void print_event_filter(struct trace_event_file *file, |
4bda2d51 | 1106 | struct trace_seq *s); |
7f1d2f82 | 1107 | extern int apply_event_filter(struct trace_event_file *file, |
8b372562 | 1108 | char *filter_string); |
7967b3e0 | 1109 | extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, |
8b372562 TZ |
1110 | char *filter_string); |
1111 | extern void print_subsystem_event_filter(struct event_subsystem *system, | |
ac1adc55 | 1112 | struct trace_seq *s); |
aa38e9fc | 1113 | extern int filter_assign_type(const char *type); |
2425bcb9 | 1114 | extern int create_event_filter(struct trace_event_call *call, |
bac5fb97 TZ |
1115 | char *filter_str, bool set_str, |
1116 | struct event_filter **filterp); | |
1117 | extern void free_event_filter(struct event_filter *filter); | |
7ce7e424 | 1118 | |
b3a8c6fd | 1119 | struct ftrace_event_field * |
2425bcb9 | 1120 | trace_find_event_field(struct trace_event_call *call, char *name); |
2e33af02 | 1121 | |
e870e9a1 | 1122 | extern void trace_event_enable_cmd_record(bool enable); |
277ba044 | 1123 | extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); |
0c8916c3 | 1124 | extern int event_trace_del_tracer(struct trace_array *tr); |
e870e9a1 | 1125 | |
7f1d2f82 SRRH |
1126 | extern struct trace_event_file *find_event_file(struct trace_array *tr, |
1127 | const char *system, | |
1128 | const char *event); | |
7862ad18 | 1129 | |
85f2b082 TZ |
1130 | static inline void *event_file_data(struct file *filp) |
1131 | { | |
1132 | return ACCESS_ONCE(file_inode(filp)->i_private); | |
1133 | } | |
1134 | ||
20c8928a | 1135 | extern struct mutex event_mutex; |
a59fd602 | 1136 | extern struct list_head ftrace_events; |
ac199db0 | 1137 | |
85f2b082 TZ |
1138 | extern const struct file_operations event_trigger_fops; |
1139 | ||
1140 | extern int register_trigger_cmds(void); | |
1141 | extern void clear_event_triggers(struct trace_array *tr); | |
1142 | ||
1143 | struct event_trigger_data { | |
1144 | unsigned long count; | |
1145 | int ref; | |
1146 | struct event_trigger_ops *ops; | |
1147 | struct event_command *cmd_ops; | |
d8a30f20 | 1148 | struct event_filter __rcu *filter; |
85f2b082 TZ |
1149 | char *filter_str; |
1150 | void *private_data; | |
1151 | struct list_head list; | |
1152 | }; | |
1153 | ||
1154 | /** | |
1155 | * struct event_trigger_ops - callbacks for trace event triggers | |
1156 | * | |
1157 | * The methods in this structure provide per-event trigger hooks for | |
1158 | * various trigger operations. | |
1159 | * | |
1160 | * All the methods below, except for @init() and @free(), must be | |
1161 | * implemented. | |
1162 | * | |
1163 | * @func: The trigger 'probe' function called when the triggering | |
1164 | * event occurs. The data passed into this callback is the data | |
1165 | * that was supplied to the event_command @reg() function that | |
1166 | * registered the trigger (see struct event_command). | |
1167 | * | |
1168 | * @init: An optional initialization function called for the trigger | |
1169 | * when the trigger is registered (via the event_command reg() | |
1170 | * function). This can be used to perform per-trigger | |
1171 | * initialization such as incrementing a per-trigger reference | |
1172 | * count, for instance. This is usually implemented by the | |
1173 | * generic utility function @event_trigger_init() (see | |
1174 | * trace_event_triggers.c). | |
1175 | * | |
1176 | * @free: An optional de-initialization function called for the | |
1177 | * trigger when the trigger is unregistered (via the | |
1178 | * event_command @reg() function). This can be used to perform | |
1179 | * per-trigger de-initialization such as decrementing a | |
1180 | * per-trigger reference count and freeing corresponding trigger | |
1181 | * data, for instance. This is usually implemented by the | |
1182 | * generic utility function @event_trigger_free() (see | |
1183 | * trace_event_triggers.c). | |
1184 | * | |
1185 | * @print: The callback function invoked to have the trigger print | |
1186 | * itself. This is usually implemented by a wrapper function | |
1187 | * that calls the generic utility function @event_trigger_print() | |
1188 | * (see trace_event_triggers.c). | |
1189 | */ | |
1190 | struct event_trigger_ops { | |
1191 | void (*func)(struct event_trigger_data *data); | |
1192 | int (*init)(struct event_trigger_ops *ops, | |
1193 | struct event_trigger_data *data); | |
1194 | void (*free)(struct event_trigger_ops *ops, | |
1195 | struct event_trigger_data *data); | |
1196 | int (*print)(struct seq_file *m, | |
1197 | struct event_trigger_ops *ops, | |
1198 | struct event_trigger_data *data); | |
1199 | }; | |
1200 | ||
1201 | /** | |
1202 | * struct event_command - callbacks and data members for event commands | |
1203 | * | |
1204 | * Event commands are invoked by users by writing the command name | |
1205 | * into the 'trigger' file associated with a trace event. The | |
1206 | * parameters associated with a specific invocation of an event | |
1207 | * command are used to create an event trigger instance, which is | |
1208 | * added to the list of trigger instances associated with that trace | |
1209 | * event. When the event is hit, the set of triggers associated with | |
1210 | * that event is invoked. | |
1211 | * | |
1212 | * The data members in this structure provide per-event command data | |
1213 | * for various event commands. | |
1214 | * | |
1215 | * All the data members below, except for @post_trigger, must be set | |
1216 | * for each event command. | |
1217 | * | |
1218 | * @name: The unique name that identifies the event command. This is | |
1219 | * the name used when setting triggers via trigger files. | |
1220 | * | |
1221 | * @trigger_type: A unique id that identifies the event command | |
1222 | * 'type'. This value has two purposes, the first to ensure that | |
1223 | * only one trigger of the same type can be set at a given time | |
1224 | * for a particular event e.g. it doesn't make sense to have both | |
1225 | * a traceon and traceoff trigger attached to a single event at | |
1226 | * the same time, so traceon and traceoff have the same type | |
1227 | * though they have different names. The @trigger_type value is | |
1228 | * also used as a bit value for deferring the actual trigger | |
1229 | * action until after the current event is finished. Some | |
1230 | * commands need to do this if they themselves log to the trace | |
1231 | * buffer (see the @post_trigger() member below). @trigger_type | |
1232 | * values are defined by adding new values to the trigger_type | |
af658dca | 1233 | * enum in include/linux/trace_events.h. |
85f2b082 TZ |
1234 | * |
1235 | * @post_trigger: A flag that says whether or not this command needs | |
1236 | * to have its action delayed until after the current event has | |
1237 | * been closed. Some triggers need to avoid being invoked while | |
1238 | * an event is currently in the process of being logged, since | |
1239 | * the trigger may itself log data into the trace buffer. Thus | |
1240 | * we make sure the current event is committed before invoking | |
1241 | * those triggers. To do that, the trigger invocation is split | |
1242 | * in two - the first part checks the filter using the current | |
1243 | * trace record; if a command has the @post_trigger flag set, it | |
1244 | * sets a bit for itself in the return value, otherwise it | |
1245 | * directly invokes the trigger. Once all commands have been | |
1246 | * either invoked or set their return flag, the current record is | |
1247 | * either committed or discarded. At that point, if any commands | |
1248 | * have deferred their triggers, those commands are finally | |
1249 | * invoked following the close of the current event. In other | |
1250 | * words, if the event_trigger_ops @func() probe implementation | |
1251 | * itself logs to the trace buffer, this flag should be set, | |
1252 | * otherwise it can be left unspecified. | |
1253 | * | |
1254 | * All the methods below, except for @set_filter(), must be | |
1255 | * implemented. | |
1256 | * | |
1257 | * @func: The callback function responsible for parsing and | |
1258 | * registering the trigger written to the 'trigger' file by the | |
1259 | * user. It allocates the trigger instance and registers it with | |
1260 | * the appropriate trace event. It makes use of the other | |
1261 | * event_command callback functions to orchestrate this, and is | |
1262 | * usually implemented by the generic utility function | |
1263 | * @event_trigger_callback() (see trace_event_triggers.c). | |
1264 | * | |
1265 | * @reg: Adds the trigger to the list of triggers associated with the | |
1266 | * event, and enables the event trigger itself, after | |
1267 | * initializing it (via the event_trigger_ops @init() function). | |
1268 | * This is also where commands can use the @trigger_type value to | |
1269 | * make the decision as to whether or not multiple instances of | |
1270 | * the trigger should be allowed. This is usually implemented by | |
1271 | * the generic utility function @register_trigger() (see | |
1272 | * trace_event_triggers.c). | |
1273 | * | |
1274 | * @unreg: Removes the trigger from the list of triggers associated | |
1275 | * with the event, and disables the event trigger itself, after | |
1276 | * initializing it (via the event_trigger_ops @free() function). | |
1277 | * This is usually implemented by the generic utility function | |
1278 | * @unregister_trigger() (see trace_event_triggers.c). | |
1279 | * | |
1280 | * @set_filter: An optional function called to parse and set a filter | |
1281 | * for the trigger. If no @set_filter() method is set for the | |
1282 | * event command, filters set by the user for the command will be | |
1283 | * ignored. This is usually implemented by the generic utility | |
1284 | * function @set_trigger_filter() (see trace_event_triggers.c). | |
1285 | * | |
1286 | * @get_trigger_ops: The callback function invoked to retrieve the | |
1287 | * event_trigger_ops implementation associated with the command. | |
1288 | */ | |
1289 | struct event_command { | |
1290 | struct list_head list; | |
1291 | char *name; | |
1292 | enum event_trigger_type trigger_type; | |
1293 | bool post_trigger; | |
1294 | int (*func)(struct event_command *cmd_ops, | |
7f1d2f82 | 1295 | struct trace_event_file *file, |
85f2b082 TZ |
1296 | char *glob, char *cmd, char *params); |
1297 | int (*reg)(char *glob, | |
1298 | struct event_trigger_ops *ops, | |
1299 | struct event_trigger_data *data, | |
7f1d2f82 | 1300 | struct trace_event_file *file); |
85f2b082 TZ |
1301 | void (*unreg)(char *glob, |
1302 | struct event_trigger_ops *ops, | |
1303 | struct event_trigger_data *data, | |
7f1d2f82 | 1304 | struct trace_event_file *file); |
85f2b082 TZ |
1305 | int (*set_filter)(char *filter_str, |
1306 | struct event_trigger_data *data, | |
7f1d2f82 | 1307 | struct trace_event_file *file); |
85f2b082 TZ |
1308 | struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); |
1309 | }; | |
1310 | ||
7f1d2f82 | 1311 | extern int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 | 1312 | int enable, int soft_disable); |
93e31ffb | 1313 | extern int tracing_alloc_snapshot(void); |
85f2b082 | 1314 | |
e9fb2b6d SR |
1315 | extern const char *__start___trace_bprintk_fmt[]; |
1316 | extern const char *__stop___trace_bprintk_fmt[]; | |
1317 | ||
102c9323 SRRH |
1318 | extern const char *__start___tracepoint_str[]; |
1319 | extern const char *__stop___tracepoint_str[]; | |
1320 | ||
b9f9108c | 1321 | void trace_printk_control(bool enabled); |
07d777fe | 1322 | void trace_printk_init_buffers(void); |
81698831 | 1323 | void trace_printk_start_comm(void); |
613f04a0 | 1324 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); |
2b6080f2 | 1325 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); |
07d777fe | 1326 | |
ca268da6 SRRH |
1327 | /* |
1328 | * Normal trace_printk() and friends allocates special buffers | |
1329 | * to do the manipulation, as well as saves the print formats | |
1330 | * into sections to display. But the trace infrastructure wants | |
1331 | * to use these without the added overhead at the price of being | |
1332 | * a bit slower (used mainly for warnings, where we don't care | |
1333 | * about performance). The internal_trace_puts() is for such | |
1334 | * a purpose. | |
1335 | */ | |
1336 | #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) | |
1337 | ||
4e5292ea | 1338 | #undef FTRACE_ENTRY |
02aa3162 | 1339 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ |
2425bcb9 | 1340 | extern struct trace_event_call \ |
52f5684c | 1341 | __aligned(4) event_##call; |
4e5292ea | 1342 | #undef FTRACE_ENTRY_DUP |
02aa3162 JO |
1343 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ |
1344 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
1345 | filter) | |
4e5292ea | 1346 | #include "trace_entries.h" |
e1112b4d | 1347 | |
6e48b550 | 1348 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) |
2425bcb9 | 1349 | int perf_ftrace_event_register(struct trace_event_call *call, |
ced39002 JO |
1350 | enum trace_reg type, void *data); |
1351 | #else | |
1352 | #define perf_ftrace_event_register NULL | |
6e48b550 | 1353 | #endif |
ced39002 | 1354 | |
5f893b26 SRRH |
1355 | #ifdef CONFIG_FTRACE_SYSCALLS |
1356 | void init_ftrace_syscalls(void); | |
1357 | #else | |
1358 | static inline void init_ftrace_syscalls(void) { } | |
1359 | #endif | |
1360 | ||
1361 | #ifdef CONFIG_EVENT_TRACING | |
1362 | void trace_event_init(void); | |
0c564a53 | 1363 | void trace_event_enum_update(struct trace_enum_map **map, int len); |
5f893b26 SRRH |
1364 | #else |
1365 | static inline void __init trace_event_init(void) { } | |
cc9e4bde | 1366 | static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { } |
5f893b26 SRRH |
1367 | #endif |
1368 | ||
0daa2302 | 1369 | extern struct trace_iterator *tracepoint_print_iter; |
5f893b26 | 1370 | |
bc0c38d1 | 1371 | #endif /* _LINUX_KERNEL_TRACE_H */ |