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 | 161 | struct tracer; |
37aea98b | 162 | struct trace_option_dentry; |
2b6080f2 | 163 | |
12883efb SRRH |
164 | struct trace_buffer { |
165 | struct trace_array *tr; | |
166 | struct ring_buffer *buffer; | |
167 | struct trace_array_cpu __percpu *data; | |
168 | cycle_t time_start; | |
169 | int cpu; | |
170 | }; | |
171 | ||
9a38a885 SRRH |
172 | #define TRACE_FLAGS_MAX_SIZE 32 |
173 | ||
37aea98b SRRH |
174 | struct trace_options { |
175 | struct tracer *tracer; | |
176 | struct trace_option_dentry *topts; | |
177 | }; | |
178 | ||
49090107 SRRH |
179 | struct trace_pid_list { |
180 | unsigned int nr_pids; | |
181 | int order; | |
182 | pid_t *pids; | |
183 | }; | |
184 | ||
bc0c38d1 SR |
185 | /* |
186 | * The trace array - an array of per-CPU trace arrays. This is the | |
187 | * highest level data structure that individual tracers deal with. | |
188 | * They have on/off state as well: | |
189 | */ | |
190 | struct trace_array { | |
ae63b31e | 191 | struct list_head list; |
277ba044 | 192 | char *name; |
12883efb SRRH |
193 | struct trace_buffer trace_buffer; |
194 | #ifdef CONFIG_TRACER_MAX_TRACE | |
195 | /* | |
196 | * The max_buffer is used to snapshot the trace when a maximum | |
197 | * latency is reached, or when the user initiates a snapshot. | |
198 | * Some tracers will use this to store a maximum trace while | |
199 | * it continues examining live traces. | |
200 | * | |
201 | * The buffers for the max_buffer are set up the same as the trace_buffer | |
202 | * When a snapshot is taken, the buffer of the max_buffer is swapped | |
203 | * with the buffer of the trace_buffer and the buffers are reset for | |
204 | * the trace_buffer so the tracing can continue. | |
205 | */ | |
206 | struct trace_buffer max_buffer; | |
45ad21ca | 207 | bool allocated_snapshot; |
6d9b3fa5 | 208 | unsigned long max_latency; |
12883efb | 209 | #endif |
49090107 | 210 | struct trace_pid_list __rcu *filtered_pids; |
0b9b12c1 SRRH |
211 | /* |
212 | * max_lock is used to protect the swapping of buffers | |
213 | * when taking a max snapshot. The buffers themselves are | |
214 | * protected by per_cpu spinlocks. But the action of the swap | |
215 | * needs its own lock. | |
216 | * | |
217 | * This is defined as a arch_spinlock_t in order to help | |
218 | * with performance when lockdep debugging is enabled. | |
219 | * | |
220 | * It is also used in other places outside the update_max_tr | |
221 | * so it needs to be defined outside of the | |
222 | * CONFIG_TRACER_MAX_TRACE. | |
223 | */ | |
224 | arch_spinlock_t max_lock; | |
499e5470 | 225 | int buffer_disabled; |
12ab74ee SR |
226 | #ifdef CONFIG_FTRACE_SYSCALLS |
227 | int sys_refcount_enter; | |
228 | int sys_refcount_exit; | |
7f1d2f82 SRRH |
229 | struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; |
230 | struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; | |
12ab74ee | 231 | #endif |
2b6080f2 SR |
232 | int stop_count; |
233 | int clock_id; | |
37aea98b | 234 | int nr_topts; |
2b6080f2 | 235 | struct tracer *current_trace; |
983f938a | 236 | unsigned int trace_flags; |
9a38a885 | 237 | unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; |
ae63b31e | 238 | unsigned int flags; |
2b6080f2 | 239 | raw_spinlock_t start_lock; |
ae63b31e | 240 | struct dentry *dir; |
2b6080f2 SR |
241 | struct dentry *options; |
242 | struct dentry *percpu_dir; | |
ae63b31e | 243 | struct dentry *event_dir; |
37aea98b | 244 | struct trace_options *topts; |
ae63b31e SR |
245 | struct list_head systems; |
246 | struct list_head events; | |
ccfe9e42 | 247 | cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
a695cb58 | 248 | int ref; |
f20a5806 SRRH |
249 | #ifdef CONFIG_FUNCTION_TRACER |
250 | struct ftrace_ops *ops; | |
251 | /* function tracing enabled */ | |
252 | int function_enabled; | |
253 | #endif | |
bc0c38d1 SR |
254 | }; |
255 | ||
ae63b31e SR |
256 | enum { |
257 | TRACE_ARRAY_FL_GLOBAL = (1 << 0) | |
258 | }; | |
259 | ||
260 | extern struct list_head ftrace_trace_arrays; | |
261 | ||
a8227415 AL |
262 | extern struct mutex trace_types_lock; |
263 | ||
8e2e2fa4 SRRH |
264 | extern int trace_array_get(struct trace_array *tr); |
265 | extern void trace_array_put(struct trace_array *tr); | |
266 | ||
ae63b31e SR |
267 | /* |
268 | * The global tracer (top) should be the first trace array added, | |
269 | * but we check the flag anyway. | |
270 | */ | |
271 | static inline struct trace_array *top_trace_array(void) | |
272 | { | |
273 | struct trace_array *tr; | |
274 | ||
da9c3413 | 275 | if (list_empty(&ftrace_trace_arrays)) |
dc81e5e3 YY |
276 | return NULL; |
277 | ||
ae63b31e SR |
278 | tr = list_entry(ftrace_trace_arrays.prev, |
279 | typeof(*tr), list); | |
280 | WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); | |
281 | return tr; | |
282 | } | |
283 | ||
7104f300 SR |
284 | #define FTRACE_CMP_TYPE(var, type) \ |
285 | __builtin_types_compatible_p(typeof(var), type *) | |
286 | ||
287 | #undef IF_ASSIGN | |
288 | #define IF_ASSIGN(var, entry, etype, id) \ | |
289 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
290 | var = (typeof(var))(entry); \ | |
291 | WARN_ON(id && (entry)->type != id); \ | |
292 | break; \ | |
293 | } | |
294 | ||
295 | /* Will cause compile errors if type is not found. */ | |
296 | extern void __ftrace_bad_type(void); | |
297 | ||
298 | /* | |
299 | * The trace_assign_type is a verifier that the entry type is | |
300 | * the same as the type being assigned. To add new types simply | |
301 | * add a line with the following format: | |
302 | * | |
303 | * IF_ASSIGN(var, ent, type, id); | |
304 | * | |
305 | * Where "type" is the trace type that includes the trace_entry | |
306 | * as the "ent" item. And "id" is the trace identifier that is | |
307 | * used in the trace_type enum. | |
308 | * | |
309 | * If the type can have more than one id, then use zero. | |
310 | */ | |
311 | #define trace_assign_type(var, ent) \ | |
312 | do { \ | |
313 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
314 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 315 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 316 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 317 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 318 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
09ae7234 | 319 | IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ |
7104f300 SR |
320 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
321 | TRACE_MMIO_RW); \ | |
322 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
323 | TRACE_MMIO_MAP); \ | |
9f029e83 | 324 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
325 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
326 | TRACE_GRAPH_ENT); \ | |
327 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
328 | TRACE_GRAPH_RET); \ | |
7104f300 SR |
329 | __ftrace_bad_type(); \ |
330 | } while (0) | |
2c4f035f | 331 | |
adf9f195 FW |
332 | /* |
333 | * An option specific to a tracer. This is a boolean value. | |
334 | * The bit is the bit index that sets its value on the | |
335 | * flags value in struct tracer_flags. | |
336 | */ | |
337 | struct tracer_opt { | |
9de36825 IM |
338 | const char *name; /* Will appear on the trace_options file */ |
339 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
340 | }; |
341 | ||
342 | /* | |
343 | * The set of specific options for a tracer. Your tracer | |
344 | * have to set the initial value of the flags val. | |
345 | */ | |
346 | struct tracer_flags { | |
347 | u32 val; | |
9de36825 | 348 | struct tracer_opt *opts; |
adf9f195 FW |
349 | }; |
350 | ||
351 | /* Makes more easy to define a tracer opt */ | |
352 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
353 | ||
034939b6 | 354 | |
41d9c0be SRRH |
355 | struct trace_option_dentry { |
356 | struct tracer_opt *opt; | |
357 | struct tracer_flags *flags; | |
358 | struct trace_array *tr; | |
359 | struct dentry *entry; | |
360 | }; | |
361 | ||
6eaaa5d5 | 362 | /** |
8434dc93 | 363 | * struct tracer - a specific tracer and its callbacks to interact with tracefs |
6eaaa5d5 FW |
364 | * @name: the name chosen to select it on the available_tracers file |
365 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
366 | * @reset: called when one switches to another tracer | |
367 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled) | |
368 | * @stop: called when tracing is paused (echo 0 > tracing_enabled) | |
6508fa76 | 369 | * @update_thresh: called when tracing_thresh is updated |
6eaaa5d5 FW |
370 | * @open: called when the trace file is opened |
371 | * @pipe_open: called when the trace_pipe file is opened | |
6eaaa5d5 | 372 | * @close: called when the trace file is released |
c521efd1 | 373 | * @pipe_close: called when the trace_pipe file is released |
6eaaa5d5 FW |
374 | * @read: override the default read callback on trace_pipe |
375 | * @splice_read: override the default splice_read callback on trace_pipe | |
376 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
377 | * @print_headers: override the first lines that describe your columns | |
378 | * @print_line: callback that prints a trace | |
379 | * @set_flag: signals one of your private flags changed (trace_options file) | |
380 | * @flags: your private flags | |
bc0c38d1 SR |
381 | */ |
382 | struct tracer { | |
383 | const char *name; | |
1c80025a | 384 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 385 | void (*reset)(struct trace_array *tr); |
9036990d SR |
386 | void (*start)(struct trace_array *tr); |
387 | void (*stop)(struct trace_array *tr); | |
6508fa76 | 388 | int (*update_thresh)(struct trace_array *tr); |
bc0c38d1 | 389 | void (*open)(struct trace_iterator *iter); |
107bad8b | 390 | void (*pipe_open)(struct trace_iterator *iter); |
bc0c38d1 | 391 | void (*close)(struct trace_iterator *iter); |
c521efd1 | 392 | void (*pipe_close)(struct trace_iterator *iter); |
107bad8b SR |
393 | ssize_t (*read)(struct trace_iterator *iter, |
394 | struct file *filp, char __user *ubuf, | |
395 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
396 | ssize_t (*splice_read)(struct trace_iterator *iter, |
397 | struct file *filp, | |
398 | loff_t *ppos, | |
399 | struct pipe_inode_info *pipe, | |
400 | size_t len, | |
401 | unsigned int flags); | |
60a11774 SR |
402 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
403 | int (*selftest)(struct tracer *trace, | |
404 | struct trace_array *tr); | |
405 | #endif | |
8bba1bf5 | 406 | void (*print_header)(struct seq_file *m); |
2c4f035f | 407 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 | 408 | /* If you handled the flag setting, return 0 */ |
8c1a49ae SRRH |
409 | int (*set_flag)(struct trace_array *tr, |
410 | u32 old_flags, u32 bit, int set); | |
613f04a0 | 411 | /* Return 0 if OK with change, else return non-zero */ |
bf6065b5 | 412 | int (*flag_changed)(struct trace_array *tr, |
613f04a0 | 413 | u32 mask, int set); |
bc0c38d1 | 414 | struct tracer *next; |
9de36825 | 415 | struct tracer_flags *flags; |
50512ab5 | 416 | int enabled; |
cf6ab6d9 | 417 | int ref; |
f43c738b | 418 | bool print_max; |
607e2ea1 | 419 | bool allow_instances; |
12883efb | 420 | #ifdef CONFIG_TRACER_MAX_TRACE |
f43c738b | 421 | bool use_max_tr; |
12883efb | 422 | #endif |
bc0c38d1 SR |
423 | }; |
424 | ||
f9520750 | 425 | |
e4a3f541 | 426 | /* Only current can touch trace_recursion */ |
e4a3f541 | 427 | |
edc15caf SR |
428 | /* |
429 | * For function tracing recursion: | |
430 | * The order of these bits are important. | |
431 | * | |
432 | * When function tracing occurs, the following steps are made: | |
433 | * If arch does not support a ftrace feature: | |
434 | * call internal function (uses INTERNAL bits) which calls... | |
435 | * If callback is registered to the "global" list, the list | |
436 | * function is called and recursion checks the GLOBAL bits. | |
437 | * then this function calls... | |
438 | * The function callback, which can use the FTRACE bits to | |
439 | * check for recursion. | |
440 | * | |
441 | * Now if the arch does not suppport a feature, and it calls | |
442 | * the global list function which calls the ftrace callback | |
443 | * all three of these steps will do a recursion protection. | |
444 | * There's no reason to do one if the previous caller already | |
445 | * did. The recursion that we are protecting against will | |
446 | * go through the same steps again. | |
447 | * | |
448 | * To prevent the multiple recursion checks, if a recursion | |
449 | * bit is set that is higher than the MAX bit of the current | |
450 | * check, then we know that the check was made by the previous | |
451 | * caller, and we can skip the current check. | |
452 | */ | |
e46cbf75 | 453 | enum { |
567cd4da SR |
454 | TRACE_BUFFER_BIT, |
455 | TRACE_BUFFER_NMI_BIT, | |
456 | TRACE_BUFFER_IRQ_BIT, | |
457 | TRACE_BUFFER_SIRQ_BIT, | |
458 | ||
459 | /* Start of function recursion bits */ | |
460 | TRACE_FTRACE_BIT, | |
edc15caf SR |
461 | TRACE_FTRACE_NMI_BIT, |
462 | TRACE_FTRACE_IRQ_BIT, | |
463 | TRACE_FTRACE_SIRQ_BIT, | |
e46cbf75 | 464 | |
4104d326 | 465 | /* INTERNAL_BITs must be greater than FTRACE_BITs */ |
edc15caf SR |
466 | TRACE_INTERNAL_BIT, |
467 | TRACE_INTERNAL_NMI_BIT, | |
468 | TRACE_INTERNAL_IRQ_BIT, | |
469 | TRACE_INTERNAL_SIRQ_BIT, | |
470 | ||
e46cbf75 | 471 | TRACE_CONTROL_BIT, |
e248491a | 472 | |
6224beb1 | 473 | TRACE_BRANCH_BIT, |
e4a3f541 SR |
474 | /* |
475 | * Abuse of the trace_recursion. | |
476 | * As we need a way to maintain state if we are tracing the function | |
477 | * graph in irq because we want to trace a particular function that | |
478 | * was called in irq context but we have irq tracing off. Since this | |
479 | * can only be modified by current, we can reuse trace_recursion. | |
480 | */ | |
e46cbf75 SR |
481 | TRACE_IRQ_BIT, |
482 | }; | |
e4a3f541 | 483 | |
e46cbf75 SR |
484 | #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) |
485 | #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) | |
486 | #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) | |
e4a3f541 | 487 | |
edc15caf SR |
488 | #define TRACE_CONTEXT_BITS 4 |
489 | ||
490 | #define TRACE_FTRACE_START TRACE_FTRACE_BIT | |
491 | #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) | |
492 | ||
edc15caf SR |
493 | #define TRACE_LIST_START TRACE_INTERNAL_BIT |
494 | #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) | |
495 | ||
496 | #define TRACE_CONTEXT_MASK TRACE_LIST_MAX | |
497 | ||
498 | static __always_inline int trace_get_context_bit(void) | |
499 | { | |
500 | int bit; | |
501 | ||
502 | if (in_interrupt()) { | |
503 | if (in_nmi()) | |
504 | bit = 0; | |
505 | ||
506 | else if (in_irq()) | |
507 | bit = 1; | |
508 | else | |
509 | bit = 2; | |
510 | } else | |
511 | bit = 3; | |
512 | ||
513 | return bit; | |
514 | } | |
515 | ||
516 | static __always_inline int trace_test_and_set_recursion(int start, int max) | |
517 | { | |
518 | unsigned int val = current->trace_recursion; | |
519 | int bit; | |
520 | ||
521 | /* A previous recursion check was made */ | |
522 | if ((val & TRACE_CONTEXT_MASK) > max) | |
523 | return 0; | |
524 | ||
525 | bit = trace_get_context_bit() + start; | |
526 | if (unlikely(val & (1 << bit))) | |
527 | return -1; | |
528 | ||
529 | val |= 1 << bit; | |
530 | current->trace_recursion = val; | |
531 | barrier(); | |
532 | ||
533 | return bit; | |
534 | } | |
535 | ||
536 | static __always_inline void trace_clear_recursion(int bit) | |
537 | { | |
538 | unsigned int val = current->trace_recursion; | |
539 | ||
540 | if (!bit) | |
541 | return; | |
542 | ||
543 | bit = 1 << bit; | |
544 | val &= ~bit; | |
545 | ||
546 | barrier(); | |
547 | current->trace_recursion = val; | |
548 | } | |
549 | ||
6d158a81 SR |
550 | static inline struct ring_buffer_iter * |
551 | trace_buffer_iter(struct trace_iterator *iter, int cpu) | |
552 | { | |
553 | if (iter->buffer_iter && iter->buffer_iter[cpu]) | |
554 | return iter->buffer_iter[cpu]; | |
555 | return NULL; | |
556 | } | |
557 | ||
b6f11df2 | 558 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 559 | int tracing_is_enabled(void); |
12883efb SRRH |
560 | void tracing_reset(struct trace_buffer *buf, int cpu); |
561 | void tracing_reset_online_cpus(struct trace_buffer *buf); | |
9456f0fa | 562 | void tracing_reset_current(int cpu); |
873c642f | 563 | void tracing_reset_all_online_cpus(void); |
bc0c38d1 | 564 | int tracing_open_generic(struct inode *inode, struct file *filp); |
2e86421d | 565 | bool tracing_is_disabled(void); |
5452af66 | 566 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 567 | umode_t mode, |
5452af66 FW |
568 | struct dentry *parent, |
569 | void *data, | |
570 | const struct file_operations *fops); | |
571 | ||
bc0c38d1 | 572 | struct dentry *tracing_init_dentry(void); |
d618b3e6 | 573 | |
51a763dd ACM |
574 | struct ring_buffer_event; |
575 | ||
e77405ad SR |
576 | struct ring_buffer_event * |
577 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
578 | int type, | |
579 | unsigned long len, | |
580 | unsigned long flags, | |
581 | int pc); | |
51a763dd | 582 | |
45dcd8b8 PP |
583 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
584 | struct trace_array_cpu *data); | |
c4a8e8be FW |
585 | |
586 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
587 | int *ent_cpu, u64 *ent_ts); | |
588 | ||
7ffbd48d SR |
589 | void __buffer_unlock_commit(struct ring_buffer *buffer, |
590 | struct ring_buffer_event *event); | |
591 | ||
955b61e5 JW |
592 | int trace_empty(struct trace_iterator *iter); |
593 | ||
594 | void *trace_find_next_entry_inc(struct trace_iterator *iter); | |
595 | ||
596 | void trace_init_global_iter(struct trace_iterator *iter); | |
597 | ||
598 | void tracing_iter_reset(struct trace_iterator *iter, int cpu); | |
599 | ||
6fb44b71 | 600 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
601 | unsigned long ip, |
602 | unsigned long parent_ip, | |
38697053 | 603 | unsigned long flags, int pc); |
0a772620 JO |
604 | void trace_graph_function(struct trace_array *tr, |
605 | unsigned long ip, | |
606 | unsigned long parent_ip, | |
607 | unsigned long flags, int pc); | |
7e9a49ef | 608 | void trace_latency_header(struct seq_file *m); |
62b915f1 JO |
609 | void trace_default_header(struct seq_file *m); |
610 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter); | |
611 | int trace_empty(struct trace_iterator *iter); | |
bc0c38d1 | 612 | |
287b6e68 | 613 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 614 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1a0799a8 | 615 | void set_graph_array(struct trace_array *tr); |
1e9b51c2 | 616 | |
41bc8144 SR |
617 | void tracing_start_cmdline_record(void); |
618 | void tracing_stop_cmdline_record(void); | |
bc0c38d1 | 619 | int register_tracer(struct tracer *type); |
b5130b1e | 620 | int is_tracing_stopped(void); |
955b61e5 | 621 | |
098c879e SRRH |
622 | loff_t tracing_lseek(struct file *file, loff_t offset, int whence); |
623 | ||
955b61e5 JW |
624 | extern cpumask_var_t __read_mostly tracing_buffer_mask; |
625 | ||
626 | #define for_each_tracing_cpu(cpu) \ | |
627 | for_each_cpu(cpu, tracing_buffer_mask) | |
bc0c38d1 SR |
628 | |
629 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
630 | ||
0e950173 TB |
631 | extern unsigned long tracing_thresh; |
632 | ||
5d4a9dba | 633 | #ifdef CONFIG_TRACER_MAX_TRACE |
bc0c38d1 SR |
634 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); |
635 | void update_max_tr_single(struct trace_array *tr, | |
636 | struct task_struct *tsk, int cpu); | |
5d4a9dba | 637 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 638 | |
c0a0d0d3 | 639 | #ifdef CONFIG_STACKTRACE |
e77405ad | 640 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
641 | int pc); |
642 | ||
643 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, | |
644 | int pc); | |
645 | #else | |
e1f7992e | 646 | static inline void ftrace_trace_userstack(struct ring_buffer *buffer, |
c0a0d0d3 FW |
647 | unsigned long flags, int pc) |
648 | { | |
649 | } | |
650 | ||
651 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags, | |
652 | int skip, int pc) | |
653 | { | |
654 | } | |
655 | #endif /* CONFIG_STACKTRACE */ | |
53614991 | 656 | |
e309b41d | 657 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 658 | |
4ca53085 | 659 | extern void trace_find_cmdline(int pid, char comm[]); |
f7d48cbd | 660 | |
bc0c38d1 SR |
661 | #ifdef CONFIG_DYNAMIC_FTRACE |
662 | extern unsigned long ftrace_update_tot_cnt; | |
ad97772a | 663 | #endif |
d05cdb25 SR |
664 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
665 | extern int DYN_FTRACE_TEST_NAME(void); | |
95950c2e SR |
666 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 |
667 | extern int DYN_FTRACE_TEST_NAME2(void); | |
bc0c38d1 | 668 | |
55034cd6 | 669 | extern bool ring_buffer_expanded; |
020e5f85 | 670 | extern bool tracing_selftest_disabled; |
9288f99a | 671 | DECLARE_PER_CPU(int, ftrace_cpu_disabled); |
020e5f85 | 672 | |
60a11774 | 673 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
674 | extern int trace_selftest_startup_function(struct tracer *trace, |
675 | struct trace_array *tr); | |
7447dce9 FW |
676 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
677 | struct trace_array *tr); | |
60a11774 SR |
678 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
679 | struct trace_array *tr); | |
60a11774 SR |
680 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
681 | struct trace_array *tr); | |
60a11774 SR |
682 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
683 | struct trace_array *tr); | |
60a11774 SR |
684 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
685 | struct trace_array *tr); | |
fb1b6d8b SN |
686 | extern int trace_selftest_startup_nop(struct tracer *trace, |
687 | struct trace_array *tr); | |
60a11774 SR |
688 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
689 | struct trace_array *tr); | |
80e5ea45 SR |
690 | extern int trace_selftest_startup_branch(struct tracer *trace, |
691 | struct trace_array *tr); | |
8f768993 SRRH |
692 | /* |
693 | * Tracer data references selftest functions that only occur | |
694 | * on boot up. These can be __init functions. Thus, when selftests | |
695 | * are enabled, then the tracers need to reference __init functions. | |
696 | */ | |
697 | #define __tracer_data __refdata | |
698 | #else | |
699 | /* Tracers are seldom changed. Optimize when selftests are disabled. */ | |
700 | #define __tracer_data __read_mostly | |
60a11774 SR |
701 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
702 | ||
c7aafc54 | 703 | extern void *head_page(struct trace_array_cpu *data); |
cf8e3474 | 704 | extern unsigned long long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 705 | extern int |
40ce74f1 | 706 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 707 | extern int |
40ce74f1 | 708 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
659372d3 SR |
709 | extern int |
710 | trace_array_vprintk(struct trace_array *tr, | |
711 | unsigned long ip, const char *fmt, va_list args); | |
712 | int trace_array_printk(struct trace_array *tr, | |
713 | unsigned long ip, const char *fmt, ...); | |
12883efb SRRH |
714 | int trace_array_printk_buf(struct ring_buffer *buffer, |
715 | unsigned long ip, const char *fmt, ...); | |
955b61e5 JW |
716 | void trace_printk_seq(struct trace_seq *s); |
717 | enum print_line_t print_trace_line(struct trace_iterator *iter); | |
c7aafc54 | 718 | |
8e1e1df2 BP |
719 | extern char trace_find_mark(unsigned long long duration); |
720 | ||
15e6cb36 | 721 | /* Standard output formatting function used for function return traces */ |
fb52607a | 722 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
62b915f1 JO |
723 | |
724 | /* Flag options */ | |
725 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1 | |
726 | #define TRACE_GRAPH_PRINT_CPU 0x2 | |
727 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 | |
728 | #define TRACE_GRAPH_PRINT_PROC 0x8 | |
729 | #define TRACE_GRAPH_PRINT_DURATION 0x10 | |
730 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 | |
ccdb5946 | 731 | #define TRACE_GRAPH_PRINT_IRQS 0x40 |
607e3a29 | 732 | #define TRACE_GRAPH_PRINT_TAIL 0x80 |
55577204 SRRH |
733 | #define TRACE_GRAPH_SLEEP_TIME 0x100 |
734 | #define TRACE_GRAPH_GRAPH_TIME 0x200 | |
6fc84ea7 SRRH |
735 | #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 |
736 | #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) | |
62b915f1 | 737 | |
55577204 SRRH |
738 | extern void ftrace_graph_sleep_time_control(bool enable); |
739 | extern void ftrace_graph_graph_time_control(bool enable); | |
740 | ||
d7a8d9e9 JO |
741 | extern enum print_line_t |
742 | print_graph_function_flags(struct trace_iterator *iter, u32 flags); | |
743 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags); | |
9d9add34 | 744 | extern void |
0706f1c4 | 745 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); |
62b915f1 JO |
746 | extern void graph_trace_open(struct trace_iterator *iter); |
747 | extern void graph_trace_close(struct trace_iterator *iter); | |
748 | extern int __trace_graph_entry(struct trace_array *tr, | |
749 | struct ftrace_graph_ent *trace, | |
750 | unsigned long flags, int pc); | |
751 | extern void __trace_graph_return(struct trace_array *tr, | |
752 | struct ftrace_graph_ret *trace, | |
753 | unsigned long flags, int pc); | |
754 | ||
ea4e2bc4 SR |
755 | |
756 | #ifdef CONFIG_DYNAMIC_FTRACE | |
757 | /* TODO: make this variable */ | |
758 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
759 | extern int ftrace_graph_count; | |
760 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
29ad23b0 NK |
761 | extern int ftrace_graph_notrace_count; |
762 | extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
ea4e2bc4 SR |
763 | |
764 | static inline int ftrace_graph_addr(unsigned long addr) | |
765 | { | |
766 | int i; | |
767 | ||
9aa72b4b | 768 | if (!ftrace_graph_count) |
ea4e2bc4 SR |
769 | return 1; |
770 | ||
771 | for (i = 0; i < ftrace_graph_count; i++) { | |
e4a3f541 SR |
772 | if (addr == ftrace_graph_funcs[i]) { |
773 | /* | |
774 | * If no irqs are to be traced, but a set_graph_function | |
775 | * is set, and called by an interrupt handler, we still | |
776 | * want to trace it. | |
777 | */ | |
778 | if (in_irq()) | |
779 | trace_recursion_set(TRACE_IRQ_BIT); | |
780 | else | |
781 | trace_recursion_clear(TRACE_IRQ_BIT); | |
ea4e2bc4 | 782 | return 1; |
e4a3f541 | 783 | } |
ea4e2bc4 SR |
784 | } |
785 | ||
786 | return 0; | |
787 | } | |
29ad23b0 NK |
788 | |
789 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
790 | { | |
791 | int i; | |
792 | ||
793 | if (!ftrace_graph_notrace_count) | |
794 | return 0; | |
795 | ||
796 | for (i = 0; i < ftrace_graph_notrace_count; i++) { | |
797 | if (addr == ftrace_graph_notrace_funcs[i]) | |
798 | return 1; | |
799 | } | |
800 | ||
801 | return 0; | |
802 | } | |
15e6cb36 | 803 | #else |
6b253930 IM |
804 | static inline int ftrace_graph_addr(unsigned long addr) |
805 | { | |
806 | return 1; | |
ea4e2bc4 | 807 | } |
29ad23b0 NK |
808 | |
809 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
810 | { | |
811 | return 0; | |
812 | } | |
ea4e2bc4 | 813 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
ea4e2bc4 | 814 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 815 | static inline enum print_line_t |
d7a8d9e9 | 816 | print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
15e6cb36 FW |
817 | { |
818 | return TRACE_TYPE_UNHANDLED; | |
819 | } | |
ea4e2bc4 | 820 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 821 | |
756d17ee | 822 | extern struct list_head ftrace_pids; |
804a6851 | 823 | |
1155de47 | 824 | #ifdef CONFIG_FUNCTION_TRACER |
f1ed7c74 | 825 | extern bool ftrace_filter_param __initdata; |
804a6851 SR |
826 | static inline int ftrace_trace_task(struct task_struct *task) |
827 | { | |
756d17ee | 828 | if (list_empty(&ftrace_pids)) |
804a6851 SR |
829 | return 1; |
830 | ||
831 | return test_tsk_trace_trace(task); | |
832 | } | |
e0a413f6 | 833 | extern int ftrace_is_dead(void); |
591dffda SRRH |
834 | int ftrace_create_function_files(struct trace_array *tr, |
835 | struct dentry *parent); | |
836 | void ftrace_destroy_function_files(struct trace_array *tr); | |
4104d326 SRRH |
837 | void ftrace_init_global_array_ops(struct trace_array *tr); |
838 | void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); | |
839 | void ftrace_reset_array_ops(struct trace_array *tr); | |
7eea4fce | 840 | int using_ftrace_ops_list_func(void); |
1155de47 PM |
841 | #else |
842 | static inline int ftrace_trace_task(struct task_struct *task) | |
843 | { | |
844 | return 1; | |
845 | } | |
e0a413f6 | 846 | static inline int ftrace_is_dead(void) { return 0; } |
591dffda SRRH |
847 | static inline int |
848 | ftrace_create_function_files(struct trace_array *tr, | |
849 | struct dentry *parent) | |
850 | { | |
851 | return 0; | |
852 | } | |
853 | static inline void ftrace_destroy_function_files(struct trace_array *tr) { } | |
4104d326 SRRH |
854 | static inline __init void |
855 | ftrace_init_global_array_ops(struct trace_array *tr) { } | |
856 | static inline void ftrace_reset_array_ops(struct trace_array *tr) { } | |
857 | /* ftace_func_t type is not defined, use macro instead of static inline */ | |
858 | #define ftrace_init_array_ops(tr, func) do { } while (0) | |
591dffda SRRH |
859 | #endif /* CONFIG_FUNCTION_TRACER */ |
860 | ||
861 | #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) | |
862 | void ftrace_create_filter_files(struct ftrace_ops *ops, | |
863 | struct dentry *parent); | |
864 | void ftrace_destroy_filter_files(struct ftrace_ops *ops); | |
865 | #else | |
866 | /* | |
867 | * The ops parameter passed in is usually undefined. | |
868 | * This must be a macro. | |
869 | */ | |
870 | #define ftrace_create_filter_files(ops, parent) do { } while (0) | |
871 | #define ftrace_destroy_filter_files(ops) do { } while (0) | |
872 | #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ | |
804a6851 | 873 | |
2425bcb9 | 874 | int ftrace_event_is_function(struct trace_event_call *call); |
ced39002 | 875 | |
b63f39ea | 876 | /* |
877 | * struct trace_parser - servers for reading the user input separated by spaces | |
878 | * @cont: set if the input is not complete - no final space char was found | |
879 | * @buffer: holds the parsed user input | |
1537a363 | 880 | * @idx: user input length |
b63f39ea | 881 | * @size: buffer size |
882 | */ | |
883 | struct trace_parser { | |
884 | bool cont; | |
885 | char *buffer; | |
886 | unsigned idx; | |
887 | unsigned size; | |
888 | }; | |
889 | ||
890 | static inline bool trace_parser_loaded(struct trace_parser *parser) | |
891 | { | |
892 | return (parser->idx != 0); | |
893 | } | |
894 | ||
895 | static inline bool trace_parser_cont(struct trace_parser *parser) | |
896 | { | |
897 | return parser->cont; | |
898 | } | |
899 | ||
900 | static inline void trace_parser_clear(struct trace_parser *parser) | |
901 | { | |
902 | parser->cont = false; | |
903 | parser->idx = 0; | |
904 | } | |
905 | ||
906 | extern int trace_parser_get_init(struct trace_parser *parser, int size); | |
907 | extern void trace_parser_put(struct trace_parser *parser); | |
908 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
909 | size_t cnt, loff_t *ppos); | |
910 | ||
729358da SRRH |
911 | /* |
912 | * Only create function graph options if function graph is configured. | |
913 | */ | |
914 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
915 | # define FGRAPH_FLAGS \ | |
729358da | 916 | C(DISPLAY_GRAPH, "display-graph"), |
729358da SRRH |
917 | #else |
918 | # define FGRAPH_FLAGS | |
729358da SRRH |
919 | #endif |
920 | ||
4ee4301c SRRH |
921 | #ifdef CONFIG_BRANCH_TRACER |
922 | # define BRANCH_FLAGS \ | |
923 | C(BRANCH, "branch"), | |
924 | #else | |
925 | # define BRANCH_FLAGS | |
926 | #endif | |
927 | ||
8179e8a1 SRRH |
928 | #ifdef CONFIG_FUNCTION_TRACER |
929 | # define FUNCTION_FLAGS \ | |
930 | C(FUNCTION, "function-trace"), | |
931 | # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION | |
932 | #else | |
933 | # define FUNCTION_FLAGS | |
934 | # define FUNCTION_DEFAULT_FLAGS 0UL | |
935 | #endif | |
936 | ||
73dddbb5 SRRH |
937 | #ifdef CONFIG_STACKTRACE |
938 | # define STACK_FLAGS \ | |
939 | C(STACKTRACE, "stacktrace"), | |
940 | #else | |
941 | # define STACK_FLAGS | |
942 | #endif | |
943 | ||
4fcdae83 SR |
944 | /* |
945 | * trace_iterator_flags is an enumeration that defines bit | |
946 | * positions into trace_flags that controls the output. | |
947 | * | |
948 | * NOTE: These bits must match the trace_options array in | |
a3418a36 | 949 | * trace.c (this macro guarantees it). |
4fcdae83 | 950 | */ |
a3418a36 SRRH |
951 | #define TRACE_FLAGS \ |
952 | C(PRINT_PARENT, "print-parent"), \ | |
953 | C(SYM_OFFSET, "sym-offset"), \ | |
954 | C(SYM_ADDR, "sym-addr"), \ | |
955 | C(VERBOSE, "verbose"), \ | |
956 | C(RAW, "raw"), \ | |
957 | C(HEX, "hex"), \ | |
958 | C(BIN, "bin"), \ | |
959 | C(BLOCK, "block"), \ | |
a3418a36 | 960 | C(PRINTK, "trace_printk"), \ |
a3418a36 SRRH |
961 | C(ANNOTATE, "annotate"), \ |
962 | C(USERSTACKTRACE, "userstacktrace"), \ | |
963 | C(SYM_USEROBJ, "sym-userobj"), \ | |
964 | C(PRINTK_MSGONLY, "printk-msg-only"), \ | |
965 | C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ | |
966 | C(LATENCY_FMT, "latency-format"), \ | |
a3418a36 SRRH |
967 | C(RECORD_CMD, "record-cmd"), \ |
968 | C(OVERWRITE, "overwrite"), \ | |
969 | C(STOP_ON_FREE, "disable_on_free"), \ | |
970 | C(IRQ_INFO, "irq-info"), \ | |
971 | C(MARKERS, "markers"), \ | |
8179e8a1 | 972 | FUNCTION_FLAGS \ |
4ee4301c | 973 | FGRAPH_FLAGS \ |
73dddbb5 | 974 | STACK_FLAGS \ |
4ee4301c | 975 | BRANCH_FLAGS |
ce3fed62 | 976 | |
a3418a36 SRRH |
977 | /* |
978 | * By defining C, we can make TRACE_FLAGS a list of bit names | |
979 | * that will define the bits for the flag masks. | |
980 | */ | |
981 | #undef C | |
982 | #define C(a, b) TRACE_ITER_##a##_BIT | |
983 | ||
b5e87c05 SRRH |
984 | enum trace_iterator_bits { |
985 | TRACE_FLAGS | |
986 | /* Make sure we don't go more than we have bits for */ | |
987 | TRACE_ITER_LAST_BIT | |
988 | }; | |
a3418a36 SRRH |
989 | |
990 | /* | |
991 | * By redefining C, we can make TRACE_FLAGS a list of masks that | |
992 | * use the bits as defined above. | |
993 | */ | |
994 | #undef C | |
995 | #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) | |
996 | ||
997 | enum trace_iterator_flags { TRACE_FLAGS }; | |
4e655519 | 998 | |
15e6cb36 FW |
999 | /* |
1000 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
1001 | * control the output of kernel symbols. | |
1002 | */ | |
1003 | #define TRACE_ITER_SYM_MASK \ | |
1004 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
1005 | ||
43a15386 FW |
1006 | extern struct tracer nop_trace; |
1007 | ||
2ed84eeb | 1008 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
1009 | extern int enable_branch_tracing(struct trace_array *tr); |
1010 | extern void disable_branch_tracing(void); | |
1011 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 1012 | { |
983f938a | 1013 | if (tr->trace_flags & TRACE_ITER_BRANCH) |
9f029e83 | 1014 | return enable_branch_tracing(tr); |
52f232cb SR |
1015 | return 0; |
1016 | } | |
9f029e83 | 1017 | static inline void trace_branch_disable(void) |
52f232cb SR |
1018 | { |
1019 | /* due to races, always disable */ | |
9f029e83 | 1020 | disable_branch_tracing(); |
52f232cb SR |
1021 | } |
1022 | #else | |
9f029e83 | 1023 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
1024 | { |
1025 | return 0; | |
1026 | } | |
9f029e83 | 1027 | static inline void trace_branch_disable(void) |
52f232cb SR |
1028 | { |
1029 | } | |
2ed84eeb | 1030 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 1031 | |
1852fcce SR |
1032 | /* set ring buffers to default size if not already done so */ |
1033 | int tracing_update_buffers(void); | |
1034 | ||
cf027f64 TZ |
1035 | struct ftrace_event_field { |
1036 | struct list_head link; | |
92edca07 SR |
1037 | const char *name; |
1038 | const char *type; | |
aa38e9fc | 1039 | int filter_type; |
cf027f64 TZ |
1040 | int offset; |
1041 | int size; | |
a118e4d1 | 1042 | int is_signed; |
cf027f64 TZ |
1043 | }; |
1044 | ||
30e673b2 | 1045 | struct event_filter { |
c9c53ca0 SR |
1046 | int n_preds; /* Number assigned */ |
1047 | int a_preds; /* allocated */ | |
74e9e58c | 1048 | struct filter_pred *preds; |
61e9dea2 | 1049 | struct filter_pred *root; |
8b372562 | 1050 | char *filter_string; |
30e673b2 TZ |
1051 | }; |
1052 | ||
cfb180f3 TZ |
1053 | struct event_subsystem { |
1054 | struct list_head list; | |
1055 | const char *name; | |
1f9963cb | 1056 | struct event_filter *filter; |
e9dbfae5 | 1057 | int ref_count; |
cfb180f3 TZ |
1058 | }; |
1059 | ||
7967b3e0 | 1060 | struct trace_subsystem_dir { |
ae63b31e SR |
1061 | struct list_head list; |
1062 | struct event_subsystem *subsystem; | |
1063 | struct trace_array *tr; | |
1064 | struct dentry *entry; | |
1065 | int ref_count; | |
1066 | int nr_events; | |
1067 | }; | |
1068 | ||
61e9dea2 SR |
1069 | #define FILTER_PRED_INVALID ((unsigned short)-1) |
1070 | #define FILTER_PRED_IS_RIGHT (1 << 15) | |
43cd4145 | 1071 | #define FILTER_PRED_FOLD (1 << 15) |
61e9dea2 | 1072 | |
bf93f9ed SR |
1073 | /* |
1074 | * The max preds is the size of unsigned short with | |
1075 | * two flags at the MSBs. One bit is used for both the IS_RIGHT | |
1076 | * and FOLD flags. The other is reserved. | |
1077 | * | |
1078 | * 2^14 preds is way more than enough. | |
1079 | */ | |
1080 | #define MAX_FILTER_PRED 16384 | |
4a3d27e9 | 1081 | |
7ce7e424 | 1082 | struct filter_pred; |
1889d209 | 1083 | struct regex; |
7ce7e424 | 1084 | |
58d9a597 | 1085 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); |
7ce7e424 | 1086 | |
1889d209 FW |
1087 | typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
1088 | ||
3f6fe06d | 1089 | enum regex_type { |
b0f1a59a | 1090 | MATCH_FULL = 0, |
3f6fe06d FW |
1091 | MATCH_FRONT_ONLY, |
1092 | MATCH_MIDDLE_ONLY, | |
1093 | MATCH_END_ONLY, | |
1094 | }; | |
1095 | ||
1889d209 FW |
1096 | struct regex { |
1097 | char pattern[MAX_FILTER_STR_VAL]; | |
1098 | int len; | |
1099 | int field_len; | |
1100 | regex_match_func match; | |
1101 | }; | |
1102 | ||
7ce7e424 | 1103 | struct filter_pred { |
1889d209 FW |
1104 | filter_pred_fn_t fn; |
1105 | u64 val; | |
1106 | struct regex regex; | |
61aaef55 | 1107 | unsigned short *ops; |
1d0e78e3 | 1108 | struct ftrace_event_field *field; |
1889d209 FW |
1109 | int offset; |
1110 | int not; | |
1111 | int op; | |
61e9dea2 SR |
1112 | unsigned short index; |
1113 | unsigned short parent; | |
1114 | unsigned short left; | |
1115 | unsigned short right; | |
7ce7e424 TZ |
1116 | }; |
1117 | ||
3f6fe06d FW |
1118 | extern enum regex_type |
1119 | filter_parse_regex(char *buff, int len, char **search, int *not); | |
7f1d2f82 | 1120 | extern void print_event_filter(struct trace_event_file *file, |
4bda2d51 | 1121 | struct trace_seq *s); |
7f1d2f82 | 1122 | extern int apply_event_filter(struct trace_event_file *file, |
8b372562 | 1123 | char *filter_string); |
7967b3e0 | 1124 | extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, |
8b372562 TZ |
1125 | char *filter_string); |
1126 | extern void print_subsystem_event_filter(struct event_subsystem *system, | |
ac1adc55 | 1127 | struct trace_seq *s); |
aa38e9fc | 1128 | extern int filter_assign_type(const char *type); |
2425bcb9 | 1129 | extern int create_event_filter(struct trace_event_call *call, |
bac5fb97 TZ |
1130 | char *filter_str, bool set_str, |
1131 | struct event_filter **filterp); | |
1132 | extern void free_event_filter(struct event_filter *filter); | |
7ce7e424 | 1133 | |
b3a8c6fd | 1134 | struct ftrace_event_field * |
2425bcb9 | 1135 | trace_find_event_field(struct trace_event_call *call, char *name); |
2e33af02 | 1136 | |
e870e9a1 | 1137 | extern void trace_event_enable_cmd_record(bool enable); |
277ba044 | 1138 | extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); |
0c8916c3 | 1139 | extern int event_trace_del_tracer(struct trace_array *tr); |
e870e9a1 | 1140 | |
7f1d2f82 SRRH |
1141 | extern struct trace_event_file *find_event_file(struct trace_array *tr, |
1142 | const char *system, | |
1143 | const char *event); | |
7862ad18 | 1144 | |
85f2b082 TZ |
1145 | static inline void *event_file_data(struct file *filp) |
1146 | { | |
1147 | return ACCESS_ONCE(file_inode(filp)->i_private); | |
1148 | } | |
1149 | ||
20c8928a | 1150 | extern struct mutex event_mutex; |
a59fd602 | 1151 | extern struct list_head ftrace_events; |
ac199db0 | 1152 | |
85f2b082 TZ |
1153 | extern const struct file_operations event_trigger_fops; |
1154 | ||
1155 | extern int register_trigger_cmds(void); | |
1156 | extern void clear_event_triggers(struct trace_array *tr); | |
1157 | ||
1158 | struct event_trigger_data { | |
1159 | unsigned long count; | |
1160 | int ref; | |
1161 | struct event_trigger_ops *ops; | |
1162 | struct event_command *cmd_ops; | |
d8a30f20 | 1163 | struct event_filter __rcu *filter; |
85f2b082 TZ |
1164 | char *filter_str; |
1165 | void *private_data; | |
1166 | struct list_head list; | |
1167 | }; | |
1168 | ||
1169 | /** | |
1170 | * struct event_trigger_ops - callbacks for trace event triggers | |
1171 | * | |
1172 | * The methods in this structure provide per-event trigger hooks for | |
1173 | * various trigger operations. | |
1174 | * | |
1175 | * All the methods below, except for @init() and @free(), must be | |
1176 | * implemented. | |
1177 | * | |
1178 | * @func: The trigger 'probe' function called when the triggering | |
1179 | * event occurs. The data passed into this callback is the data | |
1180 | * that was supplied to the event_command @reg() function that | |
1181 | * registered the trigger (see struct event_command). | |
1182 | * | |
1183 | * @init: An optional initialization function called for the trigger | |
1184 | * when the trigger is registered (via the event_command reg() | |
1185 | * function). This can be used to perform per-trigger | |
1186 | * initialization such as incrementing a per-trigger reference | |
1187 | * count, for instance. This is usually implemented by the | |
1188 | * generic utility function @event_trigger_init() (see | |
1189 | * trace_event_triggers.c). | |
1190 | * | |
1191 | * @free: An optional de-initialization function called for the | |
1192 | * trigger when the trigger is unregistered (via the | |
1193 | * event_command @reg() function). This can be used to perform | |
1194 | * per-trigger de-initialization such as decrementing a | |
1195 | * per-trigger reference count and freeing corresponding trigger | |
1196 | * data, for instance. This is usually implemented by the | |
1197 | * generic utility function @event_trigger_free() (see | |
1198 | * trace_event_triggers.c). | |
1199 | * | |
1200 | * @print: The callback function invoked to have the trigger print | |
1201 | * itself. This is usually implemented by a wrapper function | |
1202 | * that calls the generic utility function @event_trigger_print() | |
1203 | * (see trace_event_triggers.c). | |
1204 | */ | |
1205 | struct event_trigger_ops { | |
1206 | void (*func)(struct event_trigger_data *data); | |
1207 | int (*init)(struct event_trigger_ops *ops, | |
1208 | struct event_trigger_data *data); | |
1209 | void (*free)(struct event_trigger_ops *ops, | |
1210 | struct event_trigger_data *data); | |
1211 | int (*print)(struct seq_file *m, | |
1212 | struct event_trigger_ops *ops, | |
1213 | struct event_trigger_data *data); | |
1214 | }; | |
1215 | ||
1216 | /** | |
1217 | * struct event_command - callbacks and data members for event commands | |
1218 | * | |
1219 | * Event commands are invoked by users by writing the command name | |
1220 | * into the 'trigger' file associated with a trace event. The | |
1221 | * parameters associated with a specific invocation of an event | |
1222 | * command are used to create an event trigger instance, which is | |
1223 | * added to the list of trigger instances associated with that trace | |
1224 | * event. When the event is hit, the set of triggers associated with | |
1225 | * that event is invoked. | |
1226 | * | |
1227 | * The data members in this structure provide per-event command data | |
1228 | * for various event commands. | |
1229 | * | |
1230 | * All the data members below, except for @post_trigger, must be set | |
1231 | * for each event command. | |
1232 | * | |
1233 | * @name: The unique name that identifies the event command. This is | |
1234 | * the name used when setting triggers via trigger files. | |
1235 | * | |
1236 | * @trigger_type: A unique id that identifies the event command | |
1237 | * 'type'. This value has two purposes, the first to ensure that | |
1238 | * only one trigger of the same type can be set at a given time | |
1239 | * for a particular event e.g. it doesn't make sense to have both | |
1240 | * a traceon and traceoff trigger attached to a single event at | |
1241 | * the same time, so traceon and traceoff have the same type | |
1242 | * though they have different names. The @trigger_type value is | |
1243 | * also used as a bit value for deferring the actual trigger | |
1244 | * action until after the current event is finished. Some | |
1245 | * commands need to do this if they themselves log to the trace | |
1246 | * buffer (see the @post_trigger() member below). @trigger_type | |
1247 | * values are defined by adding new values to the trigger_type | |
af658dca | 1248 | * enum in include/linux/trace_events.h. |
85f2b082 TZ |
1249 | * |
1250 | * @post_trigger: A flag that says whether or not this command needs | |
1251 | * to have its action delayed until after the current event has | |
1252 | * been closed. Some triggers need to avoid being invoked while | |
1253 | * an event is currently in the process of being logged, since | |
1254 | * the trigger may itself log data into the trace buffer. Thus | |
1255 | * we make sure the current event is committed before invoking | |
1256 | * those triggers. To do that, the trigger invocation is split | |
1257 | * in two - the first part checks the filter using the current | |
1258 | * trace record; if a command has the @post_trigger flag set, it | |
1259 | * sets a bit for itself in the return value, otherwise it | |
1260 | * directly invokes the trigger. Once all commands have been | |
1261 | * either invoked or set their return flag, the current record is | |
1262 | * either committed or discarded. At that point, if any commands | |
1263 | * have deferred their triggers, those commands are finally | |
1264 | * invoked following the close of the current event. In other | |
1265 | * words, if the event_trigger_ops @func() probe implementation | |
1266 | * itself logs to the trace buffer, this flag should be set, | |
1267 | * otherwise it can be left unspecified. | |
1268 | * | |
1269 | * All the methods below, except for @set_filter(), must be | |
1270 | * implemented. | |
1271 | * | |
1272 | * @func: The callback function responsible for parsing and | |
1273 | * registering the trigger written to the 'trigger' file by the | |
1274 | * user. It allocates the trigger instance and registers it with | |
1275 | * the appropriate trace event. It makes use of the other | |
1276 | * event_command callback functions to orchestrate this, and is | |
1277 | * usually implemented by the generic utility function | |
1278 | * @event_trigger_callback() (see trace_event_triggers.c). | |
1279 | * | |
1280 | * @reg: Adds the trigger to the list of triggers associated with the | |
1281 | * event, and enables the event trigger itself, after | |
1282 | * initializing it (via the event_trigger_ops @init() function). | |
1283 | * This is also where commands can use the @trigger_type value to | |
1284 | * make the decision as to whether or not multiple instances of | |
1285 | * the trigger should be allowed. This is usually implemented by | |
1286 | * the generic utility function @register_trigger() (see | |
1287 | * trace_event_triggers.c). | |
1288 | * | |
1289 | * @unreg: Removes the trigger from the list of triggers associated | |
1290 | * with the event, and disables the event trigger itself, after | |
1291 | * initializing it (via the event_trigger_ops @free() function). | |
1292 | * This is usually implemented by the generic utility function | |
1293 | * @unregister_trigger() (see trace_event_triggers.c). | |
1294 | * | |
1295 | * @set_filter: An optional function called to parse and set a filter | |
1296 | * for the trigger. If no @set_filter() method is set for the | |
1297 | * event command, filters set by the user for the command will be | |
1298 | * ignored. This is usually implemented by the generic utility | |
1299 | * function @set_trigger_filter() (see trace_event_triggers.c). | |
1300 | * | |
1301 | * @get_trigger_ops: The callback function invoked to retrieve the | |
1302 | * event_trigger_ops implementation associated with the command. | |
1303 | */ | |
1304 | struct event_command { | |
1305 | struct list_head list; | |
1306 | char *name; | |
1307 | enum event_trigger_type trigger_type; | |
1308 | bool post_trigger; | |
1309 | int (*func)(struct event_command *cmd_ops, | |
7f1d2f82 | 1310 | struct trace_event_file *file, |
85f2b082 TZ |
1311 | char *glob, char *cmd, char *params); |
1312 | int (*reg)(char *glob, | |
1313 | struct event_trigger_ops *ops, | |
1314 | struct event_trigger_data *data, | |
7f1d2f82 | 1315 | struct trace_event_file *file); |
85f2b082 TZ |
1316 | void (*unreg)(char *glob, |
1317 | struct event_trigger_ops *ops, | |
1318 | struct event_trigger_data *data, | |
7f1d2f82 | 1319 | struct trace_event_file *file); |
85f2b082 TZ |
1320 | int (*set_filter)(char *filter_str, |
1321 | struct event_trigger_data *data, | |
7f1d2f82 | 1322 | struct trace_event_file *file); |
85f2b082 TZ |
1323 | struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); |
1324 | }; | |
1325 | ||
7f1d2f82 | 1326 | extern int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 | 1327 | int enable, int soft_disable); |
93e31ffb | 1328 | extern int tracing_alloc_snapshot(void); |
85f2b082 | 1329 | |
e9fb2b6d SR |
1330 | extern const char *__start___trace_bprintk_fmt[]; |
1331 | extern const char *__stop___trace_bprintk_fmt[]; | |
1332 | ||
102c9323 SRRH |
1333 | extern const char *__start___tracepoint_str[]; |
1334 | extern const char *__stop___tracepoint_str[]; | |
1335 | ||
b9f9108c | 1336 | void trace_printk_control(bool enabled); |
07d777fe | 1337 | void trace_printk_init_buffers(void); |
81698831 | 1338 | void trace_printk_start_comm(void); |
613f04a0 | 1339 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); |
2b6080f2 | 1340 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); |
07d777fe | 1341 | |
ca268da6 SRRH |
1342 | /* |
1343 | * Normal trace_printk() and friends allocates special buffers | |
1344 | * to do the manipulation, as well as saves the print formats | |
1345 | * into sections to display. But the trace infrastructure wants | |
1346 | * to use these without the added overhead at the price of being | |
1347 | * a bit slower (used mainly for warnings, where we don't care | |
1348 | * about performance). The internal_trace_puts() is for such | |
1349 | * a purpose. | |
1350 | */ | |
1351 | #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) | |
1352 | ||
4e5292ea | 1353 | #undef FTRACE_ENTRY |
02aa3162 | 1354 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ |
2425bcb9 | 1355 | extern struct trace_event_call \ |
52f5684c | 1356 | __aligned(4) event_##call; |
4e5292ea | 1357 | #undef FTRACE_ENTRY_DUP |
02aa3162 JO |
1358 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ |
1359 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
1360 | filter) | |
4e5292ea | 1361 | #include "trace_entries.h" |
e1112b4d | 1362 | |
6e48b550 | 1363 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) |
2425bcb9 | 1364 | int perf_ftrace_event_register(struct trace_event_call *call, |
ced39002 JO |
1365 | enum trace_reg type, void *data); |
1366 | #else | |
1367 | #define perf_ftrace_event_register NULL | |
6e48b550 | 1368 | #endif |
ced39002 | 1369 | |
5f893b26 SRRH |
1370 | #ifdef CONFIG_FTRACE_SYSCALLS |
1371 | void init_ftrace_syscalls(void); | |
1372 | #else | |
1373 | static inline void init_ftrace_syscalls(void) { } | |
1374 | #endif | |
1375 | ||
1376 | #ifdef CONFIG_EVENT_TRACING | |
1377 | void trace_event_init(void); | |
0c564a53 | 1378 | void trace_event_enum_update(struct trace_enum_map **map, int len); |
5f893b26 SRRH |
1379 | #else |
1380 | static inline void __init trace_event_init(void) { } | |
cc9e4bde | 1381 | static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { } |
5f893b26 SRRH |
1382 | #endif |
1383 | ||
0daa2302 | 1384 | extern struct trace_iterator *tracepoint_print_iter; |
5f893b26 | 1385 | |
bc0c38d1 | 1386 | #endif /* _LINUX_KERNEL_TRACE_H */ |