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bb730b58 | 1 | // SPDX-License-Identifier: GPL-2.0 |
bac5fb97 | 2 | |
bc0c38d1 SR |
3 | #ifndef _LINUX_KERNEL_TRACE_H |
4 | #define _LINUX_KERNEL_TRACE_H | |
5 | ||
6 | #include <linux/fs.h> | |
60063497 | 7 | #include <linux/atomic.h> |
bc0c38d1 SR |
8 | #include <linux/sched.h> |
9 | #include <linux/clocksource.h> | |
3928a8a2 | 10 | #include <linux/ring_buffer.h> |
bd8ac686 | 11 | #include <linux/mmiotrace.h> |
4e5292ea | 12 | #include <linux/tracepoint.h> |
d13744cd | 13 | #include <linux/ftrace.h> |
2d6425af | 14 | #include <linux/trace.h> |
24f1e32c | 15 | #include <linux/hw_breakpoint.h> |
9504504c | 16 | #include <linux/trace_seq.h> |
af658dca | 17 | #include <linux/trace_events.h> |
52f5684c | 18 | #include <linux/compiler.h> |
60f1d5e3 | 19 | #include <linux/glob.h> |
91edde2e VRB |
20 | #include <linux/irq_work.h> |
21 | #include <linux/workqueue.h> | |
42d120e2 | 22 | #include <linux/ctype.h> |
9504504c | 23 | |
12ab74ee SR |
24 | #ifdef CONFIG_FTRACE_SYSCALLS |
25 | #include <asm/unistd.h> /* For NR_SYSCALLS */ | |
26 | #include <asm/syscall.h> /* some archs define it here */ | |
27 | #endif | |
28 | ||
72829bc3 TG |
29 | enum trace_type { |
30 | __TRACE_FIRST_TYPE = 0, | |
31 | ||
32 | TRACE_FN, | |
33 | TRACE_CTX, | |
34 | TRACE_WAKE, | |
35 | TRACE_STACK, | |
dd0e545f | 36 | TRACE_PRINT, |
48ead020 | 37 | TRACE_BPRINT, |
bd8ac686 PP |
38 | TRACE_MMIO_RW, |
39 | TRACE_MMIO_MAP, | |
9f029e83 | 40 | TRACE_BRANCH, |
287b6e68 FW |
41 | TRACE_GRAPH_RET, |
42 | TRACE_GRAPH_ENT, | |
02b67518 | 43 | TRACE_USER_STACK, |
c71a8961 | 44 | TRACE_BLK, |
09ae7234 | 45 | TRACE_BPUTS, |
e7c15cd8 | 46 | TRACE_HWLAT, |
fa32e855 | 47 | TRACE_RAW_DATA, |
f689e4f2 | 48 | TRACE_FUNC_REPEATS, |
72829bc3 | 49 | |
f0868d1e | 50 | __TRACE_LAST_TYPE, |
72829bc3 TG |
51 | }; |
52 | ||
bc0c38d1 | 53 | |
0a1c49db SR |
54 | #undef __field |
55 | #define __field(type, item) type item; | |
86387f7e | 56 | |
04ae87a5 PZ |
57 | #undef __field_fn |
58 | #define __field_fn(type, item) type item; | |
59 | ||
d7315094 SR |
60 | #undef __field_struct |
61 | #define __field_struct(type, item) __field(type, item) | |
86387f7e | 62 | |
d7315094 SR |
63 | #undef __field_desc |
64 | #define __field_desc(type, container, item) | |
02b67518 | 65 | |
4649079b SRV |
66 | #undef __field_packed |
67 | #define __field_packed(type, container, item) | |
68 | ||
0a1c49db SR |
69 | #undef __array |
70 | #define __array(type, item, size) type item[size]; | |
1427cdf0 | 71 | |
d7315094 SR |
72 | #undef __array_desc |
73 | #define __array_desc(type, container, item, size) | |
777e208d | 74 | |
0a1c49db SR |
75 | #undef __dynamic_array |
76 | #define __dynamic_array(type, item) type item[]; | |
777e208d | 77 | |
0a1c49db SR |
78 | #undef F_STRUCT |
79 | #define F_STRUCT(args...) args | |
74239072 | 80 | |
0a1c49db | 81 | #undef FTRACE_ENTRY |
04ae87a5 | 82 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \ |
02aa3162 JO |
83 | struct struct_name { \ |
84 | struct trace_entry ent; \ | |
85 | tstruct \ | |
0a1c49db | 86 | } |
777e208d | 87 | |
0a1c49db | 88 | #undef FTRACE_ENTRY_DUP |
04ae87a5 | 89 | #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk) |
1e9b51c2 | 90 | |
e59a0bff | 91 | #undef FTRACE_ENTRY_REG |
04ae87a5 PZ |
92 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \ |
93 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) | |
e59a0bff | 94 | |
a4a551b8 | 95 | #undef FTRACE_ENTRY_PACKED |
04ae87a5 PZ |
96 | #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \ |
97 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed | |
a4a551b8 | 98 | |
0a1c49db | 99 | #include "trace_entries.h" |
36994e58 | 100 | |
24589e3a SRV |
101 | /* Use this for memory failure errors */ |
102 | #define MEM_FAIL(condition, fmt, ...) ({ \ | |
33def849 | 103 | static bool __section(".data.once") __warned; \ |
24589e3a SRV |
104 | int __ret_warn_once = !!(condition); \ |
105 | \ | |
106 | if (unlikely(__ret_warn_once && !__warned)) { \ | |
107 | __warned = true; \ | |
108 | pr_err("ERROR: " fmt, ##__VA_ARGS__); \ | |
109 | } \ | |
110 | unlikely(__ret_warn_once); \ | |
111 | }) | |
112 | ||
0a1c49db SR |
113 | /* |
114 | * syscalls are special, and need special handling, this is why | |
115 | * they are not included in trace_entries.h | |
116 | */ | |
bed1ffca FW |
117 | struct syscall_trace_enter { |
118 | struct trace_entry ent; | |
119 | int nr; | |
120 | unsigned long args[]; | |
121 | }; | |
122 | ||
123 | struct syscall_trace_exit { | |
124 | struct trace_entry ent; | |
125 | int nr; | |
99df5a6a | 126 | long ret; |
bed1ffca FW |
127 | }; |
128 | ||
93ccae7a | 129 | struct kprobe_trace_entry_head { |
413d37d1 MH |
130 | struct trace_entry ent; |
131 | unsigned long ip; | |
413d37d1 MH |
132 | }; |
133 | ||
93ccae7a | 134 | struct kretprobe_trace_entry_head { |
413d37d1 MH |
135 | struct trace_entry ent; |
136 | unsigned long func; | |
137 | unsigned long ret_ip; | |
413d37d1 MH |
138 | }; |
139 | ||
5bf9a1ee | 140 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 | 141 | |
2b6080f2 SR |
142 | struct trace_array; |
143 | ||
bc0c38d1 SR |
144 | /* |
145 | * The CPU trace array - it consists of thousands of trace entries | |
146 | * plus some other descriptor data: (for example which task started | |
147 | * the trace, etc.) | |
148 | */ | |
149 | struct trace_array_cpu { | |
bc0c38d1 | 150 | atomic_t disabled; |
2cadf913 | 151 | void *buffer_page; /* ring buffer spare */ |
4e3c3333 | 152 | |
438ced17 | 153 | unsigned long entries; |
bc0c38d1 SR |
154 | unsigned long saved_latency; |
155 | unsigned long critical_start; | |
156 | unsigned long critical_end; | |
157 | unsigned long critical_sequence; | |
158 | unsigned long nice; | |
159 | unsigned long policy; | |
160 | unsigned long rt_priority; | |
2f26ebd5 | 161 | unsigned long skipped_entries; |
a5a1d1c2 | 162 | u64 preempt_timestamp; |
bc0c38d1 | 163 | pid_t pid; |
d20b92ab | 164 | kuid_t uid; |
bc0c38d1 | 165 | char comm[TASK_COMM_LEN]; |
3fdaf80f | 166 | |
345ddcc8 | 167 | #ifdef CONFIG_FUNCTION_TRACER |
717e3f5e | 168 | int ftrace_ignore_pid; |
345ddcc8 | 169 | #endif |
717e3f5e | 170 | bool ignore_pid; |
bc0c38d1 SR |
171 | }; |
172 | ||
2b6080f2 | 173 | struct tracer; |
37aea98b | 174 | struct trace_option_dentry; |
2b6080f2 | 175 | |
1c5eb448 | 176 | struct array_buffer { |
12883efb | 177 | struct trace_array *tr; |
13292494 | 178 | struct trace_buffer *buffer; |
12883efb | 179 | struct trace_array_cpu __percpu *data; |
a5a1d1c2 | 180 | u64 time_start; |
12883efb SRRH |
181 | int cpu; |
182 | }; | |
183 | ||
9a38a885 SRRH |
184 | #define TRACE_FLAGS_MAX_SIZE 32 |
185 | ||
37aea98b SRRH |
186 | struct trace_options { |
187 | struct tracer *tracer; | |
188 | struct trace_option_dentry *topts; | |
189 | }; | |
190 | ||
49090107 | 191 | struct trace_pid_list { |
f4d34a87 SR |
192 | int pid_max; |
193 | unsigned long *pids; | |
49090107 SRRH |
194 | }; |
195 | ||
27683626 SRV |
196 | enum { |
197 | TRACE_PIDS = BIT(0), | |
198 | TRACE_NO_PIDS = BIT(1), | |
199 | }; | |
200 | ||
201 | static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list, | |
202 | struct trace_pid_list *no_pid_list) | |
203 | { | |
204 | /* Return true if the pid list in type has pids */ | |
205 | return ((type & TRACE_PIDS) && pid_list) || | |
206 | ((type & TRACE_NO_PIDS) && no_pid_list); | |
207 | } | |
208 | ||
209 | static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list, | |
210 | struct trace_pid_list *no_pid_list) | |
211 | { | |
212 | /* | |
213 | * Turning off what is in @type, return true if the "other" | |
214 | * pid list, still has pids in it. | |
215 | */ | |
216 | return (!(type & TRACE_PIDS) && pid_list) || | |
217 | (!(type & TRACE_NO_PIDS) && no_pid_list); | |
218 | } | |
219 | ||
a35873a0 TZ |
220 | typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data); |
221 | ||
222 | /** | |
223 | * struct cond_snapshot - conditional snapshot data and callback | |
224 | * | |
225 | * The cond_snapshot structure encapsulates a callback function and | |
226 | * data associated with the snapshot for a given tracing instance. | |
227 | * | |
228 | * When a snapshot is taken conditionally, by invoking | |
229 | * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is | |
230 | * passed in turn to the cond_snapshot.update() function. That data | |
231 | * can be compared by the update() implementation with the cond_data | |
499f7bb0 | 232 | * contained within the struct cond_snapshot instance associated with |
a35873a0 TZ |
233 | * the trace_array. Because the tr->max_lock is held throughout the |
234 | * update() call, the update() function can directly retrieve the | |
235 | * cond_snapshot and cond_data associated with the per-instance | |
236 | * snapshot associated with the trace_array. | |
237 | * | |
238 | * The cond_snapshot.update() implementation can save data to be | |
239 | * associated with the snapshot if it decides to, and returns 'true' | |
240 | * in that case, or it returns 'false' if the conditional snapshot | |
241 | * shouldn't be taken. | |
242 | * | |
243 | * The cond_snapshot instance is created and associated with the | |
244 | * user-defined cond_data by tracing_cond_snapshot_enable(). | |
245 | * Likewise, the cond_snapshot instance is destroyed and is no longer | |
246 | * associated with the trace instance by | |
247 | * tracing_cond_snapshot_disable(). | |
248 | * | |
249 | * The method below is required. | |
250 | * | |
251 | * @update: When a conditional snapshot is invoked, the update() | |
252 | * callback function is invoked with the tr->max_lock held. The | |
253 | * update() implementation signals whether or not to actually | |
254 | * take the snapshot, by returning 'true' if so, 'false' if no | |
255 | * snapshot should be taken. Because the max_lock is held for | |
256 | * the duration of update(), the implementation is safe to | |
499f7bb0 | 257 | * directly retrieved and save any implementation data it needs |
a35873a0 TZ |
258 | * to in association with the snapshot. |
259 | */ | |
260 | struct cond_snapshot { | |
261 | void *cond_data; | |
262 | cond_update_fn_t update; | |
263 | }; | |
264 | ||
20344c54 YKV |
265 | /* |
266 | * struct trace_func_repeats - used to keep track of the consecutive | |
267 | * (on the same CPU) calls of a single function. | |
268 | */ | |
269 | struct trace_func_repeats { | |
270 | unsigned long ip; | |
271 | unsigned long parent_ip; | |
272 | unsigned long count; | |
273 | u64 ts_last_call; | |
274 | }; | |
275 | ||
bc0c38d1 SR |
276 | /* |
277 | * The trace array - an array of per-CPU trace arrays. This is the | |
278 | * highest level data structure that individual tracers deal with. | |
279 | * They have on/off state as well: | |
280 | */ | |
281 | struct trace_array { | |
ae63b31e | 282 | struct list_head list; |
277ba044 | 283 | char *name; |
1c5eb448 | 284 | struct array_buffer array_buffer; |
12883efb SRRH |
285 | #ifdef CONFIG_TRACER_MAX_TRACE |
286 | /* | |
287 | * The max_buffer is used to snapshot the trace when a maximum | |
288 | * latency is reached, or when the user initiates a snapshot. | |
289 | * Some tracers will use this to store a maximum trace while | |
290 | * it continues examining live traces. | |
291 | * | |
1c5eb448 | 292 | * The buffers for the max_buffer are set up the same as the array_buffer |
12883efb | 293 | * When a snapshot is taken, the buffer of the max_buffer is swapped |
1c5eb448 SRV |
294 | * with the buffer of the array_buffer and the buffers are reset for |
295 | * the array_buffer so the tracing can continue. | |
12883efb | 296 | */ |
1c5eb448 | 297 | struct array_buffer max_buffer; |
45ad21ca | 298 | bool allocated_snapshot; |
f971cc9a SRRH |
299 | #endif |
300 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) | |
6d9b3fa5 | 301 | unsigned long max_latency; |
91edde2e VRB |
302 | #ifdef CONFIG_FSNOTIFY |
303 | struct dentry *d_max_latency; | |
304 | struct work_struct fsnotify_work; | |
305 | struct irq_work fsnotify_irqwork; | |
306 | #endif | |
12883efb | 307 | #endif |
49090107 | 308 | struct trace_pid_list __rcu *filtered_pids; |
27683626 | 309 | struct trace_pid_list __rcu *filtered_no_pids; |
0b9b12c1 SRRH |
310 | /* |
311 | * max_lock is used to protect the swapping of buffers | |
312 | * when taking a max snapshot. The buffers themselves are | |
313 | * protected by per_cpu spinlocks. But the action of the swap | |
314 | * needs its own lock. | |
315 | * | |
316 | * This is defined as a arch_spinlock_t in order to help | |
317 | * with performance when lockdep debugging is enabled. | |
318 | * | |
319 | * It is also used in other places outside the update_max_tr | |
320 | * so it needs to be defined outside of the | |
321 | * CONFIG_TRACER_MAX_TRACE. | |
322 | */ | |
323 | arch_spinlock_t max_lock; | |
499e5470 | 324 | int buffer_disabled; |
12ab74ee SR |
325 | #ifdef CONFIG_FTRACE_SYSCALLS |
326 | int sys_refcount_enter; | |
327 | int sys_refcount_exit; | |
7f1d2f82 SRRH |
328 | struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; |
329 | struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; | |
12ab74ee | 330 | #endif |
2b6080f2 SR |
331 | int stop_count; |
332 | int clock_id; | |
37aea98b | 333 | int nr_topts; |
065e63f9 | 334 | bool clear_trace; |
03329f99 | 335 | int buffer_percent; |
2f754e77 | 336 | unsigned int n_err_log_entries; |
2b6080f2 | 337 | struct tracer *current_trace; |
983f938a | 338 | unsigned int trace_flags; |
9a38a885 | 339 | unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; |
ae63b31e | 340 | unsigned int flags; |
2b6080f2 | 341 | raw_spinlock_t start_lock; |
2f754e77 | 342 | struct list_head err_log; |
ae63b31e | 343 | struct dentry *dir; |
2b6080f2 SR |
344 | struct dentry *options; |
345 | struct dentry *percpu_dir; | |
ae63b31e | 346 | struct dentry *event_dir; |
37aea98b | 347 | struct trace_options *topts; |
ae63b31e SR |
348 | struct list_head systems; |
349 | struct list_head events; | |
3dd80953 | 350 | struct trace_event_file *trace_marker_file; |
ccfe9e42 | 351 | cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
a695cb58 | 352 | int ref; |
7ef282e0 | 353 | int trace_ref; |
f20a5806 SRRH |
354 | #ifdef CONFIG_FUNCTION_TRACER |
355 | struct ftrace_ops *ops; | |
345ddcc8 | 356 | struct trace_pid_list __rcu *function_pids; |
b3b1e6ed | 357 | struct trace_pid_list __rcu *function_no_pids; |
04ec7bb6 | 358 | #ifdef CONFIG_DYNAMIC_FTRACE |
673feb9d | 359 | /* All of these are protected by the ftrace_lock */ |
04ec7bb6 | 360 | struct list_head func_probes; |
673feb9d SRV |
361 | struct list_head mod_trace; |
362 | struct list_head mod_notrace; | |
04ec7bb6 | 363 | #endif |
f20a5806 SRRH |
364 | /* function tracing enabled */ |
365 | int function_enabled; | |
366 | #endif | |
b94bc80d | 367 | int no_filter_buffering_ref; |
067fe038 | 368 | struct list_head hist_vars; |
a35873a0 TZ |
369 | #ifdef CONFIG_TRACER_SNAPSHOT |
370 | struct cond_snapshot *cond_snapshot; | |
371 | #endif | |
20344c54 | 372 | struct trace_func_repeats __percpu *last_func_repeats; |
bc0c38d1 SR |
373 | }; |
374 | ||
ae63b31e SR |
375 | enum { |
376 | TRACE_ARRAY_FL_GLOBAL = (1 << 0) | |
377 | }; | |
378 | ||
379 | extern struct list_head ftrace_trace_arrays; | |
380 | ||
a8227415 AL |
381 | extern struct mutex trace_types_lock; |
382 | ||
8e2e2fa4 | 383 | extern int trace_array_get(struct trace_array *tr); |
8530dec6 | 384 | extern int tracing_check_open_get_tr(struct trace_array *tr); |
89c95fce TZ |
385 | extern struct trace_array *trace_array_find(const char *instance); |
386 | extern struct trace_array *trace_array_find_get(const char *instance); | |
8e2e2fa4 | 387 | |
d8279bfc | 388 | extern u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe); |
b94bc80d | 389 | extern int tracing_set_filter_buffering(struct trace_array *tr, bool set); |
d71bd34d | 390 | extern int tracing_set_clock(struct trace_array *tr, const char *clockstr); |
00b41452 | 391 | |
860f9f6b TZ |
392 | extern bool trace_clock_in_ns(struct trace_array *tr); |
393 | ||
ae63b31e SR |
394 | /* |
395 | * The global tracer (top) should be the first trace array added, | |
396 | * but we check the flag anyway. | |
397 | */ | |
398 | static inline struct trace_array *top_trace_array(void) | |
399 | { | |
400 | struct trace_array *tr; | |
401 | ||
da9c3413 | 402 | if (list_empty(&ftrace_trace_arrays)) |
dc81e5e3 YY |
403 | return NULL; |
404 | ||
ae63b31e SR |
405 | tr = list_entry(ftrace_trace_arrays.prev, |
406 | typeof(*tr), list); | |
407 | WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); | |
408 | return tr; | |
409 | } | |
410 | ||
7104f300 SR |
411 | #define FTRACE_CMP_TYPE(var, type) \ |
412 | __builtin_types_compatible_p(typeof(var), type *) | |
413 | ||
414 | #undef IF_ASSIGN | |
968e5170 NC |
415 | #define IF_ASSIGN(var, entry, etype, id) \ |
416 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
417 | var = (typeof(var))(entry); \ | |
418 | WARN_ON(id != 0 && (entry)->type != id); \ | |
419 | break; \ | |
7104f300 SR |
420 | } |
421 | ||
422 | /* Will cause compile errors if type is not found. */ | |
423 | extern void __ftrace_bad_type(void); | |
424 | ||
425 | /* | |
426 | * The trace_assign_type is a verifier that the entry type is | |
427 | * the same as the type being assigned. To add new types simply | |
428 | * add a line with the following format: | |
429 | * | |
430 | * IF_ASSIGN(var, ent, type, id); | |
431 | * | |
432 | * Where "type" is the trace type that includes the trace_entry | |
433 | * as the "ent" item. And "id" is the trace identifier that is | |
434 | * used in the trace_type enum. | |
435 | * | |
436 | * If the type can have more than one id, then use zero. | |
437 | */ | |
438 | #define trace_assign_type(var, ent) \ | |
439 | do { \ | |
440 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
441 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 442 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 443 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 444 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 445 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
09ae7234 | 446 | IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ |
e7c15cd8 | 447 | IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ |
fa32e855 | 448 | IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\ |
7104f300 SR |
449 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
450 | TRACE_MMIO_RW); \ | |
451 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
452 | TRACE_MMIO_MAP); \ | |
9f029e83 | 453 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
454 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
455 | TRACE_GRAPH_ENT); \ | |
456 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
457 | TRACE_GRAPH_RET); \ | |
f689e4f2 YKV |
458 | IF_ASSIGN(var, ent, struct func_repeats_entry, \ |
459 | TRACE_FUNC_REPEATS); \ | |
7104f300 SR |
460 | __ftrace_bad_type(); \ |
461 | } while (0) | |
2c4f035f | 462 | |
adf9f195 FW |
463 | /* |
464 | * An option specific to a tracer. This is a boolean value. | |
465 | * The bit is the bit index that sets its value on the | |
466 | * flags value in struct tracer_flags. | |
467 | */ | |
468 | struct tracer_opt { | |
9de36825 IM |
469 | const char *name; /* Will appear on the trace_options file */ |
470 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
471 | }; |
472 | ||
473 | /* | |
474 | * The set of specific options for a tracer. Your tracer | |
475 | * have to set the initial value of the flags val. | |
476 | */ | |
477 | struct tracer_flags { | |
478 | u32 val; | |
9de36825 | 479 | struct tracer_opt *opts; |
d39cdd20 | 480 | struct tracer *trace; |
adf9f195 FW |
481 | }; |
482 | ||
483 | /* Makes more easy to define a tracer opt */ | |
484 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
485 | ||
034939b6 | 486 | |
41d9c0be SRRH |
487 | struct trace_option_dentry { |
488 | struct tracer_opt *opt; | |
489 | struct tracer_flags *flags; | |
490 | struct trace_array *tr; | |
491 | struct dentry *entry; | |
492 | }; | |
493 | ||
6eaaa5d5 | 494 | /** |
8434dc93 | 495 | * struct tracer - a specific tracer and its callbacks to interact with tracefs |
6eaaa5d5 FW |
496 | * @name: the name chosen to select it on the available_tracers file |
497 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
498 | * @reset: called when one switches to another tracer | |
05a724bd CH |
499 | * @start: called when tracing is unpaused (echo 1 > tracing_on) |
500 | * @stop: called when tracing is paused (echo 0 > tracing_on) | |
6508fa76 | 501 | * @update_thresh: called when tracing_thresh is updated |
6eaaa5d5 FW |
502 | * @open: called when the trace file is opened |
503 | * @pipe_open: called when the trace_pipe file is opened | |
6eaaa5d5 | 504 | * @close: called when the trace file is released |
c521efd1 | 505 | * @pipe_close: called when the trace_pipe file is released |
6eaaa5d5 FW |
506 | * @read: override the default read callback on trace_pipe |
507 | * @splice_read: override the default splice_read callback on trace_pipe | |
508 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
509 | * @print_headers: override the first lines that describe your columns | |
510 | * @print_line: callback that prints a trace | |
511 | * @set_flag: signals one of your private flags changed (trace_options file) | |
512 | * @flags: your private flags | |
bc0c38d1 SR |
513 | */ |
514 | struct tracer { | |
515 | const char *name; | |
1c80025a | 516 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 517 | void (*reset)(struct trace_array *tr); |
9036990d SR |
518 | void (*start)(struct trace_array *tr); |
519 | void (*stop)(struct trace_array *tr); | |
6508fa76 | 520 | int (*update_thresh)(struct trace_array *tr); |
bc0c38d1 | 521 | void (*open)(struct trace_iterator *iter); |
107bad8b | 522 | void (*pipe_open)(struct trace_iterator *iter); |
bc0c38d1 | 523 | void (*close)(struct trace_iterator *iter); |
c521efd1 | 524 | void (*pipe_close)(struct trace_iterator *iter); |
107bad8b SR |
525 | ssize_t (*read)(struct trace_iterator *iter, |
526 | struct file *filp, char __user *ubuf, | |
527 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
528 | ssize_t (*splice_read)(struct trace_iterator *iter, |
529 | struct file *filp, | |
530 | loff_t *ppos, | |
531 | struct pipe_inode_info *pipe, | |
532 | size_t len, | |
533 | unsigned int flags); | |
60a11774 SR |
534 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
535 | int (*selftest)(struct tracer *trace, | |
536 | struct trace_array *tr); | |
537 | #endif | |
8bba1bf5 | 538 | void (*print_header)(struct seq_file *m); |
2c4f035f | 539 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 | 540 | /* If you handled the flag setting, return 0 */ |
8c1a49ae SRRH |
541 | int (*set_flag)(struct trace_array *tr, |
542 | u32 old_flags, u32 bit, int set); | |
613f04a0 | 543 | /* Return 0 if OK with change, else return non-zero */ |
bf6065b5 | 544 | int (*flag_changed)(struct trace_array *tr, |
613f04a0 | 545 | u32 mask, int set); |
bc0c38d1 | 546 | struct tracer *next; |
9de36825 | 547 | struct tracer_flags *flags; |
50512ab5 | 548 | int enabled; |
f43c738b | 549 | bool print_max; |
607e2ea1 | 550 | bool allow_instances; |
12883efb | 551 | #ifdef CONFIG_TRACER_MAX_TRACE |
f43c738b | 552 | bool use_max_tr; |
12883efb | 553 | #endif |
c7b3ae0b ZSZ |
554 | /* True if tracer cannot be enabled in kernel param */ |
555 | bool noboot; | |
bc0c38d1 SR |
556 | }; |
557 | ||
6d158a81 SR |
558 | static inline struct ring_buffer_iter * |
559 | trace_buffer_iter(struct trace_iterator *iter, int cpu) | |
560 | { | |
f26808ba | 561 | return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL; |
6d158a81 SR |
562 | } |
563 | ||
b6f11df2 | 564 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 565 | int tracing_is_enabled(void); |
1c5eb448 | 566 | void tracing_reset_online_cpus(struct array_buffer *buf); |
9456f0fa | 567 | void tracing_reset_current(int cpu); |
873c642f | 568 | void tracing_reset_all_online_cpus(void); |
bc0c38d1 | 569 | int tracing_open_generic(struct inode *inode, struct file *filp); |
aa07d71f | 570 | int tracing_open_generic_tr(struct inode *inode, struct file *filp); |
2e86421d | 571 | bool tracing_is_disabled(void); |
ec573508 | 572 | bool tracer_tracing_is_on(struct trace_array *tr); |
2290f2c5 SRV |
573 | void tracer_tracing_on(struct trace_array *tr); |
574 | void tracer_tracing_off(struct trace_array *tr); | |
5452af66 | 575 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 576 | umode_t mode, |
5452af66 FW |
577 | struct dentry *parent, |
578 | void *data, | |
579 | const struct file_operations *fops); | |
580 | ||
22c36b18 | 581 | int tracing_init_dentry(void); |
d618b3e6 | 582 | |
51a763dd ACM |
583 | struct ring_buffer_event; |
584 | ||
e77405ad | 585 | struct ring_buffer_event * |
13292494 | 586 | trace_buffer_lock_reserve(struct trace_buffer *buffer, |
e77405ad SR |
587 | int type, |
588 | unsigned long len, | |
36590c50 | 589 | unsigned int trace_ctx); |
51a763dd | 590 | |
45dcd8b8 PP |
591 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
592 | struct trace_array_cpu *data); | |
c4a8e8be FW |
593 | |
594 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
595 | int *ent_cpu, u64 *ent_ts); | |
596 | ||
13292494 | 597 | void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, |
52ffabe3 | 598 | struct ring_buffer_event *event); |
7ffbd48d | 599 | |
9a6944fe | 600 | bool trace_is_tracepoint_string(const char *str); |
efbbdaa2 | 601 | const char *trace_event_format(struct trace_iterator *iter, const char *fmt); |
9a6944fe SRV |
602 | void trace_check_vprintf(struct trace_iterator *iter, const char *fmt, |
603 | va_list ap); | |
efbbdaa2 | 604 | |
955b61e5 JW |
605 | int trace_empty(struct trace_iterator *iter); |
606 | ||
607 | void *trace_find_next_entry_inc(struct trace_iterator *iter); | |
608 | ||
609 | void trace_init_global_iter(struct trace_iterator *iter); | |
610 | ||
611 | void tracing_iter_reset(struct trace_iterator *iter, int cpu); | |
612 | ||
ecffc8a8 DA |
613 | unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu); |
614 | unsigned long trace_total_entries(struct trace_array *tr); | |
615 | ||
6fb44b71 | 616 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
617 | unsigned long ip, |
618 | unsigned long parent_ip, | |
36590c50 | 619 | unsigned int trace_ctx); |
0a772620 JO |
620 | void trace_graph_function(struct trace_array *tr, |
621 | unsigned long ip, | |
622 | unsigned long parent_ip, | |
36590c50 | 623 | unsigned int trace_ctx); |
7e9a49ef | 624 | void trace_latency_header(struct seq_file *m); |
62b915f1 JO |
625 | void trace_default_header(struct seq_file *m); |
626 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter); | |
bc0c38d1 | 627 | |
287b6e68 | 628 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 629 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1a0799a8 | 630 | void set_graph_array(struct trace_array *tr); |
1e9b51c2 | 631 | |
41bc8144 SR |
632 | void tracing_start_cmdline_record(void); |
633 | void tracing_stop_cmdline_record(void); | |
d914ba37 JF |
634 | void tracing_start_tgid_record(void); |
635 | void tracing_stop_tgid_record(void); | |
636 | ||
bc0c38d1 | 637 | int register_tracer(struct tracer *type); |
b5130b1e | 638 | int is_tracing_stopped(void); |
955b61e5 | 639 | |
098c879e SRRH |
640 | loff_t tracing_lseek(struct file *file, loff_t offset, int whence); |
641 | ||
955b61e5 JW |
642 | extern cpumask_var_t __read_mostly tracing_buffer_mask; |
643 | ||
644 | #define for_each_tracing_cpu(cpu) \ | |
645 | for_each_cpu(cpu, tracing_buffer_mask) | |
bc0c38d1 SR |
646 | |
647 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
648 | ||
0e950173 TB |
649 | extern unsigned long tracing_thresh; |
650 | ||
4e267db1 | 651 | /* PID filtering */ |
76c813e2 SRRH |
652 | |
653 | extern int pid_max; | |
654 | ||
4e267db1 SR |
655 | bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, |
656 | pid_t search_pid); | |
657 | bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, | |
b3b1e6ed | 658 | struct trace_pid_list *filtered_no_pids, |
4e267db1 SR |
659 | struct task_struct *task); |
660 | void trace_filter_add_remove_task(struct trace_pid_list *pid_list, | |
661 | struct task_struct *self, | |
662 | struct task_struct *task); | |
5cc8976b SRRH |
663 | void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); |
664 | void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); | |
665 | int trace_pid_show(struct seq_file *m, void *v); | |
76c813e2 SRRH |
666 | void trace_free_pid_list(struct trace_pid_list *pid_list); |
667 | int trace_pid_write(struct trace_pid_list *filtered_pids, | |
668 | struct trace_pid_list **new_pid_list, | |
669 | const char __user *ubuf, size_t cnt); | |
4e267db1 | 670 | |
5d4a9dba | 671 | #ifdef CONFIG_TRACER_MAX_TRACE |
a35873a0 TZ |
672 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, |
673 | void *cond_data); | |
bc0c38d1 SR |
674 | void update_max_tr_single(struct trace_array *tr, |
675 | struct task_struct *tsk, int cpu); | |
5d4a9dba | 676 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 677 | |
91edde2e VRB |
678 | #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ |
679 | defined(CONFIG_FSNOTIFY) | |
680 | ||
681 | void latency_fsnotify(struct trace_array *tr); | |
682 | ||
683 | #else | |
684 | ||
36b3615d | 685 | static inline void latency_fsnotify(struct trace_array *tr) { } |
91edde2e VRB |
686 | |
687 | #endif | |
688 | ||
c0a0d0d3 | 689 | #ifdef CONFIG_STACKTRACE |
36590c50 | 690 | void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip); |
c0a0d0d3 | 691 | #else |
36590c50 SAS |
692 | static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, |
693 | int skip) | |
c0a0d0d3 FW |
694 | { |
695 | } | |
696 | #endif /* CONFIG_STACKTRACE */ | |
53614991 | 697 | |
c658797f YKV |
698 | void trace_last_func_repeats(struct trace_array *tr, |
699 | struct trace_func_repeats *last_info, | |
700 | unsigned int trace_ctx); | |
701 | ||
a5a1d1c2 | 702 | extern u64 ftrace_now(int cpu); |
bc0c38d1 | 703 | |
4ca53085 | 704 | extern void trace_find_cmdline(int pid, char comm[]); |
d914ba37 | 705 | extern int trace_find_tgid(int pid); |
c37775d5 | 706 | extern void trace_event_follow_fork(struct trace_array *tr, bool enable); |
f7d48cbd | 707 | |
bc0c38d1 SR |
708 | #ifdef CONFIG_DYNAMIC_FTRACE |
709 | extern unsigned long ftrace_update_tot_cnt; | |
da537f0a SRV |
710 | extern unsigned long ftrace_number_of_pages; |
711 | extern unsigned long ftrace_number_of_groups; | |
04ec7bb6 SRV |
712 | void ftrace_init_trace_array(struct trace_array *tr); |
713 | #else | |
714 | static inline void ftrace_init_trace_array(struct trace_array *tr) { } | |
ad97772a | 715 | #endif |
d05cdb25 SR |
716 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
717 | extern int DYN_FTRACE_TEST_NAME(void); | |
95950c2e SR |
718 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 |
719 | extern int DYN_FTRACE_TEST_NAME2(void); | |
bc0c38d1 | 720 | |
55034cd6 | 721 | extern bool ring_buffer_expanded; |
020e5f85 LZ |
722 | extern bool tracing_selftest_disabled; |
723 | ||
60a11774 | 724 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60efe21e MH |
725 | extern void __init disable_tracing_selftest(const char *reason); |
726 | ||
60a11774 SR |
727 | extern int trace_selftest_startup_function(struct tracer *trace, |
728 | struct trace_array *tr); | |
7447dce9 FW |
729 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
730 | struct trace_array *tr); | |
60a11774 SR |
731 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
732 | struct trace_array *tr); | |
60a11774 SR |
733 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
734 | struct trace_array *tr); | |
60a11774 SR |
735 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
736 | struct trace_array *tr); | |
60a11774 SR |
737 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
738 | struct trace_array *tr); | |
fb1b6d8b SN |
739 | extern int trace_selftest_startup_nop(struct tracer *trace, |
740 | struct trace_array *tr); | |
80e5ea45 SR |
741 | extern int trace_selftest_startup_branch(struct tracer *trace, |
742 | struct trace_array *tr); | |
8f768993 SRRH |
743 | /* |
744 | * Tracer data references selftest functions that only occur | |
745 | * on boot up. These can be __init functions. Thus, when selftests | |
746 | * are enabled, then the tracers need to reference __init functions. | |
747 | */ | |
748 | #define __tracer_data __refdata | |
749 | #else | |
60efe21e MH |
750 | static inline void __init disable_tracing_selftest(const char *reason) |
751 | { | |
752 | } | |
8f768993 SRRH |
753 | /* Tracers are seldom changed. Optimize when selftests are disabled. */ |
754 | #define __tracer_data __read_mostly | |
60a11774 SR |
755 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
756 | ||
c7aafc54 | 757 | extern void *head_page(struct trace_array_cpu *data); |
a5a1d1c2 | 758 | extern unsigned long long ns2usecs(u64 nsec); |
1fd8f2a3 | 759 | extern int |
40ce74f1 | 760 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 761 | extern int |
40ce74f1 | 762 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
659372d3 SR |
763 | extern int |
764 | trace_array_vprintk(struct trace_array *tr, | |
765 | unsigned long ip, const char *fmt, va_list args); | |
13292494 | 766 | int trace_array_printk_buf(struct trace_buffer *buffer, |
12883efb | 767 | unsigned long ip, const char *fmt, ...); |
955b61e5 JW |
768 | void trace_printk_seq(struct trace_seq *s); |
769 | enum print_line_t print_trace_line(struct trace_iterator *iter); | |
c7aafc54 | 770 | |
8e1e1df2 BP |
771 | extern char trace_find_mark(unsigned long long duration); |
772 | ||
673feb9d SRV |
773 | struct ftrace_hash; |
774 | ||
775 | struct ftrace_mod_load { | |
776 | struct list_head list; | |
777 | char *func; | |
778 | char *module; | |
779 | int enable; | |
780 | }; | |
781 | ||
8c08f0d5 SRV |
782 | enum { |
783 | FTRACE_HASH_FL_MOD = (1 << 0), | |
784 | }; | |
785 | ||
4046bf02 NK |
786 | struct ftrace_hash { |
787 | unsigned long size_bits; | |
788 | struct hlist_head *buckets; | |
789 | unsigned long count; | |
8c08f0d5 | 790 | unsigned long flags; |
4046bf02 NK |
791 | struct rcu_head rcu; |
792 | }; | |
793 | ||
794 | struct ftrace_func_entry * | |
795 | ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip); | |
796 | ||
eb583cd4 | 797 | static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) |
4046bf02 | 798 | { |
8c08f0d5 | 799 | return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD)); |
4046bf02 NK |
800 | } |
801 | ||
15e6cb36 | 802 | /* Standard output formatting function used for function return traces */ |
fb52607a | 803 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
62b915f1 JO |
804 | |
805 | /* Flag options */ | |
806 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1 | |
807 | #define TRACE_GRAPH_PRINT_CPU 0x2 | |
808 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 | |
809 | #define TRACE_GRAPH_PRINT_PROC 0x8 | |
810 | #define TRACE_GRAPH_PRINT_DURATION 0x10 | |
811 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 | |
9acd8de6 CD |
812 | #define TRACE_GRAPH_PRINT_REL_TIME 0x40 |
813 | #define TRACE_GRAPH_PRINT_IRQS 0x80 | |
814 | #define TRACE_GRAPH_PRINT_TAIL 0x100 | |
815 | #define TRACE_GRAPH_SLEEP_TIME 0x200 | |
816 | #define TRACE_GRAPH_GRAPH_TIME 0x400 | |
6fc84ea7 SRRH |
817 | #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 |
818 | #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) | |
62b915f1 | 819 | |
55577204 | 820 | extern void ftrace_graph_sleep_time_control(bool enable); |
c8dd0f45 SRV |
821 | |
822 | #ifdef CONFIG_FUNCTION_PROFILER | |
55577204 | 823 | extern void ftrace_graph_graph_time_control(bool enable); |
c8dd0f45 SRV |
824 | #else |
825 | static inline void ftrace_graph_graph_time_control(bool enable) { } | |
826 | #endif | |
55577204 | 827 | |
d7a8d9e9 JO |
828 | extern enum print_line_t |
829 | print_graph_function_flags(struct trace_iterator *iter, u32 flags); | |
830 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags); | |
9d9add34 | 831 | extern void |
0706f1c4 | 832 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); |
62b915f1 JO |
833 | extern void graph_trace_open(struct trace_iterator *iter); |
834 | extern void graph_trace_close(struct trace_iterator *iter); | |
835 | extern int __trace_graph_entry(struct trace_array *tr, | |
836 | struct ftrace_graph_ent *trace, | |
36590c50 | 837 | unsigned int trace_ctx); |
62b915f1 JO |
838 | extern void __trace_graph_return(struct trace_array *tr, |
839 | struct ftrace_graph_ret *trace, | |
36590c50 | 840 | unsigned int trace_ctx); |
62b915f1 | 841 | |
ea4e2bc4 | 842 | #ifdef CONFIG_DYNAMIC_FTRACE |
24a9729f | 843 | extern struct ftrace_hash __rcu *ftrace_graph_hash; |
fd0e6852 | 844 | extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash; |
ea4e2bc4 | 845 | |
5cf99a0f | 846 | static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) |
ea4e2bc4 | 847 | { |
5cf99a0f | 848 | unsigned long addr = trace->func; |
b9b0c831 | 849 | int ret = 0; |
24a9729f | 850 | struct ftrace_hash *hash; |
b9b0c831 NK |
851 | |
852 | preempt_disable_notrace(); | |
853 | ||
16052dd5 SRV |
854 | /* |
855 | * Have to open code "rcu_dereference_sched()" because the | |
856 | * function graph tracer can be called when RCU is not | |
857 | * "watching". | |
54a16ff6 | 858 | * Protected with schedule_on_each_cpu(ftrace_sync) |
16052dd5 | 859 | */ |
24a9729f AG |
860 | hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible()); |
861 | ||
862 | if (ftrace_hash_empty(hash)) { | |
b9b0c831 NK |
863 | ret = 1; |
864 | goto out; | |
ea4e2bc4 SR |
865 | } |
866 | ||
24a9729f | 867 | if (ftrace_lookup_ip(hash, addr)) { |
5cf99a0f SRV |
868 | |
869 | /* | |
870 | * This needs to be cleared on the return functions | |
871 | * when the depth is zero. | |
872 | */ | |
873 | trace_recursion_set(TRACE_GRAPH_BIT); | |
874 | trace_recursion_set_depth(trace->depth); | |
875 | ||
b9b0c831 NK |
876 | /* |
877 | * If no irqs are to be traced, but a set_graph_function | |
878 | * is set, and called by an interrupt handler, we still | |
879 | * want to trace it. | |
880 | */ | |
881 | if (in_irq()) | |
882 | trace_recursion_set(TRACE_IRQ_BIT); | |
883 | else | |
884 | trace_recursion_clear(TRACE_IRQ_BIT); | |
885 | ret = 1; | |
886 | } | |
887 | ||
888 | out: | |
889 | preempt_enable_notrace(); | |
890 | return ret; | |
ea4e2bc4 | 891 | } |
29ad23b0 | 892 | |
5cf99a0f SRV |
893 | static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) |
894 | { | |
895 | if (trace_recursion_test(TRACE_GRAPH_BIT) && | |
896 | trace->depth == trace_recursion_depth()) | |
897 | trace_recursion_clear(TRACE_GRAPH_BIT); | |
898 | } | |
899 | ||
29ad23b0 NK |
900 | static inline int ftrace_graph_notrace_addr(unsigned long addr) |
901 | { | |
b9b0c831 | 902 | int ret = 0; |
fd0e6852 | 903 | struct ftrace_hash *notrace_hash; |
29ad23b0 | 904 | |
b9b0c831 | 905 | preempt_disable_notrace(); |
29ad23b0 | 906 | |
16052dd5 SRV |
907 | /* |
908 | * Have to open code "rcu_dereference_sched()" because the | |
909 | * function graph tracer can be called when RCU is not | |
910 | * "watching". | |
54a16ff6 | 911 | * Protected with schedule_on_each_cpu(ftrace_sync) |
16052dd5 | 912 | */ |
fd0e6852 AG |
913 | notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash, |
914 | !preemptible()); | |
915 | ||
916 | if (ftrace_lookup_ip(notrace_hash, addr)) | |
b9b0c831 | 917 | ret = 1; |
29ad23b0 | 918 | |
b9b0c831 NK |
919 | preempt_enable_notrace(); |
920 | return ret; | |
29ad23b0 | 921 | } |
15e6cb36 | 922 | #else |
5cf99a0f | 923 | static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace) |
6b253930 IM |
924 | { |
925 | return 1; | |
ea4e2bc4 | 926 | } |
29ad23b0 NK |
927 | |
928 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
929 | { | |
930 | return 0; | |
931 | } | |
5cf99a0f SRV |
932 | static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace) |
933 | { } | |
ea4e2bc4 | 934 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
1a414428 SRRH |
935 | |
936 | extern unsigned int fgraph_max_depth; | |
937 | ||
938 | static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace) | |
939 | { | |
940 | /* trace it when it is-nested-in or is a function enabled. */ | |
5cf99a0f SRV |
941 | return !(trace_recursion_test(TRACE_GRAPH_BIT) || |
942 | ftrace_graph_addr(trace)) || | |
1a414428 SRRH |
943 | (trace->depth < 0) || |
944 | (fgraph_max_depth && trace->depth >= fgraph_max_depth); | |
945 | } | |
946 | ||
ea4e2bc4 | 947 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 948 | static inline enum print_line_t |
d7a8d9e9 | 949 | print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
15e6cb36 FW |
950 | { |
951 | return TRACE_TYPE_UNHANDLED; | |
952 | } | |
ea4e2bc4 | 953 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 954 | |
756d17ee | 955 | extern struct list_head ftrace_pids; |
804a6851 | 956 | |
1155de47 | 957 | #ifdef CONFIG_FUNCTION_TRACER |
c58b6b03 JB |
958 | |
959 | #define FTRACE_PID_IGNORE -1 | |
960 | #define FTRACE_PID_TRACE -2 | |
961 | ||
92a68fa0 SRV |
962 | struct ftrace_func_command { |
963 | struct list_head list; | |
964 | char *name; | |
04ec7bb6 SRV |
965 | int (*func)(struct trace_array *tr, |
966 | struct ftrace_hash *hash, | |
92a68fa0 SRV |
967 | char *func, char *cmd, |
968 | char *params, int enable); | |
969 | }; | |
f1ed7c74 | 970 | extern bool ftrace_filter_param __initdata; |
345ddcc8 | 971 | static inline int ftrace_trace_task(struct trace_array *tr) |
804a6851 | 972 | { |
c58b6b03 JB |
973 | return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) != |
974 | FTRACE_PID_IGNORE; | |
804a6851 | 975 | } |
e0a413f6 | 976 | extern int ftrace_is_dead(void); |
591dffda SRRH |
977 | int ftrace_create_function_files(struct trace_array *tr, |
978 | struct dentry *parent); | |
979 | void ftrace_destroy_function_files(struct trace_array *tr); | |
4114fbfd MH |
980 | int ftrace_allocate_ftrace_ops(struct trace_array *tr); |
981 | void ftrace_free_ftrace_ops(struct trace_array *tr); | |
4104d326 SRRH |
982 | void ftrace_init_global_array_ops(struct trace_array *tr); |
983 | void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); | |
984 | void ftrace_reset_array_ops(struct trace_array *tr); | |
345ddcc8 | 985 | void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); |
501c2375 SRRH |
986 | void ftrace_init_tracefs_toplevel(struct trace_array *tr, |
987 | struct dentry *d_tracer); | |
d879d0b8 | 988 | void ftrace_clear_pids(struct trace_array *tr); |
dbeafd0d | 989 | int init_function_trace(void); |
1e10486f | 990 | void ftrace_pid_follow_fork(struct trace_array *tr, bool enable); |
1155de47 | 991 | #else |
345ddcc8 | 992 | static inline int ftrace_trace_task(struct trace_array *tr) |
1155de47 PM |
993 | { |
994 | return 1; | |
995 | } | |
e0a413f6 | 996 | static inline int ftrace_is_dead(void) { return 0; } |
591dffda SRRH |
997 | static inline int |
998 | ftrace_create_function_files(struct trace_array *tr, | |
999 | struct dentry *parent) | |
1000 | { | |
1001 | return 0; | |
1002 | } | |
4114fbfd MH |
1003 | static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr) |
1004 | { | |
1005 | return 0; | |
1006 | } | |
1007 | static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { } | |
591dffda | 1008 | static inline void ftrace_destroy_function_files(struct trace_array *tr) { } |
4104d326 SRRH |
1009 | static inline __init void |
1010 | ftrace_init_global_array_ops(struct trace_array *tr) { } | |
1011 | static inline void ftrace_reset_array_ops(struct trace_array *tr) { } | |
345ddcc8 | 1012 | static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } |
501c2375 | 1013 | static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } |
d879d0b8 | 1014 | static inline void ftrace_clear_pids(struct trace_array *tr) { } |
dbeafd0d | 1015 | static inline int init_function_trace(void) { return 0; } |
1e10486f | 1016 | static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { } |
4104d326 SRRH |
1017 | /* ftace_func_t type is not defined, use macro instead of static inline */ |
1018 | #define ftrace_init_array_ops(tr, func) do { } while (0) | |
591dffda SRRH |
1019 | #endif /* CONFIG_FUNCTION_TRACER */ |
1020 | ||
1021 | #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) | |
ec19b859 SRV |
1022 | |
1023 | struct ftrace_probe_ops { | |
1024 | void (*func)(unsigned long ip, | |
1025 | unsigned long parent_ip, | |
b5f081b5 | 1026 | struct trace_array *tr, |
bca6c8d0 | 1027 | struct ftrace_probe_ops *ops, |
6e444319 | 1028 | void *data); |
ec19b859 | 1029 | int (*init)(struct ftrace_probe_ops *ops, |
b5f081b5 | 1030 | struct trace_array *tr, |
6e444319 SRV |
1031 | unsigned long ip, void *init_data, |
1032 | void **data); | |
ec19b859 | 1033 | void (*free)(struct ftrace_probe_ops *ops, |
b5f081b5 | 1034 | struct trace_array *tr, |
6e444319 | 1035 | unsigned long ip, void *data); |
ec19b859 SRV |
1036 | int (*print)(struct seq_file *m, |
1037 | unsigned long ip, | |
1038 | struct ftrace_probe_ops *ops, | |
1039 | void *data); | |
1040 | }; | |
1041 | ||
41794f19 SRV |
1042 | struct ftrace_func_mapper; |
1043 | typedef int (*ftrace_mapper_func)(void *data); | |
1044 | ||
1045 | struct ftrace_func_mapper *allocate_ftrace_func_mapper(void); | |
1046 | void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper, | |
1047 | unsigned long ip); | |
1048 | int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper, | |
1049 | unsigned long ip, void *data); | |
1050 | void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper, | |
1051 | unsigned long ip); | |
1052 | void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, | |
1053 | ftrace_mapper_func free_func); | |
1054 | ||
ec19b859 | 1055 | extern int |
04ec7bb6 SRV |
1056 | register_ftrace_function_probe(char *glob, struct trace_array *tr, |
1057 | struct ftrace_probe_ops *ops, void *data); | |
d3d532d7 | 1058 | extern int |
7b60f3d8 SRV |
1059 | unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr, |
1060 | struct ftrace_probe_ops *ops); | |
a0e6369e | 1061 | extern void clear_ftrace_function_probes(struct trace_array *tr); |
ec19b859 | 1062 | |
92a68fa0 SRV |
1063 | int register_ftrace_command(struct ftrace_func_command *cmd); |
1064 | int unregister_ftrace_command(struct ftrace_func_command *cmd); | |
1065 | ||
591dffda SRRH |
1066 | void ftrace_create_filter_files(struct ftrace_ops *ops, |
1067 | struct dentry *parent); | |
1068 | void ftrace_destroy_filter_files(struct ftrace_ops *ops); | |
5c3469cb MH |
1069 | |
1070 | extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, | |
1071 | int len, int reset); | |
1072 | extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, | |
1073 | int len, int reset); | |
591dffda | 1074 | #else |
92a68fa0 SRV |
1075 | struct ftrace_func_command; |
1076 | ||
1077 | static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) | |
1078 | { | |
1079 | return -EINVAL; | |
1080 | } | |
1081 | static inline __init int unregister_ftrace_command(char *cmd_name) | |
1082 | { | |
1083 | return -EINVAL; | |
1084 | } | |
8a49f3e0 SRV |
1085 | static inline void clear_ftrace_function_probes(struct trace_array *tr) |
1086 | { | |
1087 | } | |
1088 | ||
591dffda SRRH |
1089 | /* |
1090 | * The ops parameter passed in is usually undefined. | |
1091 | * This must be a macro. | |
1092 | */ | |
1093 | #define ftrace_create_filter_files(ops, parent) do { } while (0) | |
1094 | #define ftrace_destroy_filter_files(ops) do { } while (0) | |
1095 | #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ | |
804a6851 | 1096 | |
c6650b2e | 1097 | bool ftrace_event_is_function(struct trace_event_call *call); |
ced39002 | 1098 | |
b63f39ea | 1099 | /* |
1100 | * struct trace_parser - servers for reading the user input separated by spaces | |
1101 | * @cont: set if the input is not complete - no final space char was found | |
1102 | * @buffer: holds the parsed user input | |
1537a363 | 1103 | * @idx: user input length |
b63f39ea | 1104 | * @size: buffer size |
1105 | */ | |
1106 | struct trace_parser { | |
1107 | bool cont; | |
1108 | char *buffer; | |
1109 | unsigned idx; | |
1110 | unsigned size; | |
1111 | }; | |
1112 | ||
1113 | static inline bool trace_parser_loaded(struct trace_parser *parser) | |
1114 | { | |
1115 | return (parser->idx != 0); | |
1116 | } | |
1117 | ||
1118 | static inline bool trace_parser_cont(struct trace_parser *parser) | |
1119 | { | |
1120 | return parser->cont; | |
1121 | } | |
1122 | ||
1123 | static inline void trace_parser_clear(struct trace_parser *parser) | |
1124 | { | |
1125 | parser->cont = false; | |
1126 | parser->idx = 0; | |
1127 | } | |
1128 | ||
1129 | extern int trace_parser_get_init(struct trace_parser *parser, int size); | |
1130 | extern void trace_parser_put(struct trace_parser *parser); | |
1131 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
1132 | size_t cnt, loff_t *ppos); | |
1133 | ||
729358da SRRH |
1134 | /* |
1135 | * Only create function graph options if function graph is configured. | |
1136 | */ | |
1137 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
1138 | # define FGRAPH_FLAGS \ | |
729358da | 1139 | C(DISPLAY_GRAPH, "display-graph"), |
729358da SRRH |
1140 | #else |
1141 | # define FGRAPH_FLAGS | |
729358da SRRH |
1142 | #endif |
1143 | ||
4ee4301c SRRH |
1144 | #ifdef CONFIG_BRANCH_TRACER |
1145 | # define BRANCH_FLAGS \ | |
1146 | C(BRANCH, "branch"), | |
1147 | #else | |
1148 | # define BRANCH_FLAGS | |
1149 | #endif | |
1150 | ||
8179e8a1 SRRH |
1151 | #ifdef CONFIG_FUNCTION_TRACER |
1152 | # define FUNCTION_FLAGS \ | |
1e10486f NK |
1153 | C(FUNCTION, "function-trace"), \ |
1154 | C(FUNC_FORK, "function-fork"), | |
8179e8a1 SRRH |
1155 | # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION |
1156 | #else | |
1157 | # define FUNCTION_FLAGS | |
1158 | # define FUNCTION_DEFAULT_FLAGS 0UL | |
1e10486f | 1159 | # define TRACE_ITER_FUNC_FORK 0UL |
8179e8a1 SRRH |
1160 | #endif |
1161 | ||
73dddbb5 SRRH |
1162 | #ifdef CONFIG_STACKTRACE |
1163 | # define STACK_FLAGS \ | |
1164 | C(STACKTRACE, "stacktrace"), | |
1165 | #else | |
1166 | # define STACK_FLAGS | |
1167 | #endif | |
1168 | ||
4fcdae83 SR |
1169 | /* |
1170 | * trace_iterator_flags is an enumeration that defines bit | |
1171 | * positions into trace_flags that controls the output. | |
1172 | * | |
1173 | * NOTE: These bits must match the trace_options array in | |
a3418a36 | 1174 | * trace.c (this macro guarantees it). |
4fcdae83 | 1175 | */ |
a3418a36 SRRH |
1176 | #define TRACE_FLAGS \ |
1177 | C(PRINT_PARENT, "print-parent"), \ | |
1178 | C(SYM_OFFSET, "sym-offset"), \ | |
1179 | C(SYM_ADDR, "sym-addr"), \ | |
1180 | C(VERBOSE, "verbose"), \ | |
1181 | C(RAW, "raw"), \ | |
1182 | C(HEX, "hex"), \ | |
1183 | C(BIN, "bin"), \ | |
1184 | C(BLOCK, "block"), \ | |
a3418a36 | 1185 | C(PRINTK, "trace_printk"), \ |
a3418a36 SRRH |
1186 | C(ANNOTATE, "annotate"), \ |
1187 | C(USERSTACKTRACE, "userstacktrace"), \ | |
1188 | C(SYM_USEROBJ, "sym-userobj"), \ | |
1189 | C(PRINTK_MSGONLY, "printk-msg-only"), \ | |
1190 | C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ | |
1191 | C(LATENCY_FMT, "latency-format"), \ | |
a3418a36 | 1192 | C(RECORD_CMD, "record-cmd"), \ |
d914ba37 | 1193 | C(RECORD_TGID, "record-tgid"), \ |
a3418a36 SRRH |
1194 | C(OVERWRITE, "overwrite"), \ |
1195 | C(STOP_ON_FREE, "disable_on_free"), \ | |
1196 | C(IRQ_INFO, "irq-info"), \ | |
1197 | C(MARKERS, "markers"), \ | |
c37775d5 | 1198 | C(EVENT_FORK, "event-fork"), \ |
06e0a548 | 1199 | C(PAUSE_ON_TRACE, "pause-on-trace"), \ |
a345a671 | 1200 | C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \ |
8179e8a1 | 1201 | FUNCTION_FLAGS \ |
4ee4301c | 1202 | FGRAPH_FLAGS \ |
73dddbb5 | 1203 | STACK_FLAGS \ |
4ee4301c | 1204 | BRANCH_FLAGS |
ce3fed62 | 1205 | |
a3418a36 SRRH |
1206 | /* |
1207 | * By defining C, we can make TRACE_FLAGS a list of bit names | |
1208 | * that will define the bits for the flag masks. | |
1209 | */ | |
1210 | #undef C | |
1211 | #define C(a, b) TRACE_ITER_##a##_BIT | |
1212 | ||
b5e87c05 SRRH |
1213 | enum trace_iterator_bits { |
1214 | TRACE_FLAGS | |
1215 | /* Make sure we don't go more than we have bits for */ | |
1216 | TRACE_ITER_LAST_BIT | |
1217 | }; | |
a3418a36 SRRH |
1218 | |
1219 | /* | |
1220 | * By redefining C, we can make TRACE_FLAGS a list of masks that | |
1221 | * use the bits as defined above. | |
1222 | */ | |
1223 | #undef C | |
1224 | #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) | |
1225 | ||
1226 | enum trace_iterator_flags { TRACE_FLAGS }; | |
4e655519 | 1227 | |
15e6cb36 FW |
1228 | /* |
1229 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
1230 | * control the output of kernel symbols. | |
1231 | */ | |
1232 | #define TRACE_ITER_SYM_MASK \ | |
1233 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
1234 | ||
43a15386 FW |
1235 | extern struct tracer nop_trace; |
1236 | ||
2ed84eeb | 1237 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
1238 | extern int enable_branch_tracing(struct trace_array *tr); |
1239 | extern void disable_branch_tracing(void); | |
1240 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 1241 | { |
983f938a | 1242 | if (tr->trace_flags & TRACE_ITER_BRANCH) |
9f029e83 | 1243 | return enable_branch_tracing(tr); |
52f232cb SR |
1244 | return 0; |
1245 | } | |
9f029e83 | 1246 | static inline void trace_branch_disable(void) |
52f232cb SR |
1247 | { |
1248 | /* due to races, always disable */ | |
9f029e83 | 1249 | disable_branch_tracing(); |
52f232cb SR |
1250 | } |
1251 | #else | |
9f029e83 | 1252 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
1253 | { |
1254 | return 0; | |
1255 | } | |
9f029e83 | 1256 | static inline void trace_branch_disable(void) |
52f232cb SR |
1257 | { |
1258 | } | |
2ed84eeb | 1259 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 1260 | |
1852fcce SR |
1261 | /* set ring buffers to default size if not already done so */ |
1262 | int tracing_update_buffers(void); | |
1263 | ||
cf027f64 TZ |
1264 | struct ftrace_event_field { |
1265 | struct list_head link; | |
92edca07 SR |
1266 | const char *name; |
1267 | const char *type; | |
aa38e9fc | 1268 | int filter_type; |
cf027f64 TZ |
1269 | int offset; |
1270 | int size; | |
a118e4d1 | 1271 | int is_signed; |
cf027f64 TZ |
1272 | }; |
1273 | ||
80765597 SRV |
1274 | struct prog_entry; |
1275 | ||
30e673b2 | 1276 | struct event_filter { |
80765597 SRV |
1277 | struct prog_entry __rcu *prog; |
1278 | char *filter_string; | |
30e673b2 TZ |
1279 | }; |
1280 | ||
cfb180f3 TZ |
1281 | struct event_subsystem { |
1282 | struct list_head list; | |
1283 | const char *name; | |
1f9963cb | 1284 | struct event_filter *filter; |
e9dbfae5 | 1285 | int ref_count; |
cfb180f3 TZ |
1286 | }; |
1287 | ||
7967b3e0 | 1288 | struct trace_subsystem_dir { |
ae63b31e SR |
1289 | struct list_head list; |
1290 | struct event_subsystem *subsystem; | |
1291 | struct trace_array *tr; | |
1292 | struct dentry *entry; | |
1293 | int ref_count; | |
1294 | int nr_events; | |
1295 | }; | |
1296 | ||
65da9a0a | 1297 | extern int call_filter_check_discard(struct trace_event_call *call, void *rec, |
13292494 | 1298 | struct trace_buffer *buffer, |
65da9a0a | 1299 | struct ring_buffer_event *event); |
fa66ddb8 | 1300 | |
fa66ddb8 | 1301 | void trace_buffer_unlock_commit_regs(struct trace_array *tr, |
13292494 | 1302 | struct trace_buffer *buffer, |
fa66ddb8 | 1303 | struct ring_buffer_event *event, |
36590c50 | 1304 | unsigned int trcace_ctx, |
fa66ddb8 | 1305 | struct pt_regs *regs); |
33fddff2 SRRH |
1306 | |
1307 | static inline void trace_buffer_unlock_commit(struct trace_array *tr, | |
13292494 | 1308 | struct trace_buffer *buffer, |
33fddff2 | 1309 | struct ring_buffer_event *event, |
36590c50 | 1310 | unsigned int trace_ctx) |
33fddff2 | 1311 | { |
36590c50 | 1312 | trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL); |
33fddff2 SRRH |
1313 | } |
1314 | ||
0fc1b09f SRRH |
1315 | DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); |
1316 | DECLARE_PER_CPU(int, trace_buffered_event_cnt); | |
1317 | void trace_buffered_event_disable(void); | |
1318 | void trace_buffered_event_enable(void); | |
1319 | ||
1320 | static inline void | |
13292494 | 1321 | __trace_event_discard_commit(struct trace_buffer *buffer, |
0fc1b09f SRRH |
1322 | struct ring_buffer_event *event) |
1323 | { | |
1324 | if (this_cpu_read(trace_buffered_event) == event) { | |
1325 | /* Simply release the temp buffer */ | |
1326 | this_cpu_dec(trace_buffered_event_cnt); | |
1327 | return; | |
1328 | } | |
1329 | ring_buffer_discard_commit(buffer, event); | |
1330 | } | |
1331 | ||
dad56ee7 SRRH |
1332 | /* |
1333 | * Helper function for event_trigger_unlock_commit{_regs}(). | |
1334 | * If there are event triggers attached to this event that requires | |
499f7bb0 | 1335 | * filtering against its fields, then they will be called as the |
dad56ee7 SRRH |
1336 | * entry already holds the field information of the current event. |
1337 | * | |
1338 | * It also checks if the event should be discarded or not. | |
1339 | * It is to be discarded if the event is soft disabled and the | |
1340 | * event was only recorded to process triggers, or if the event | |
1341 | * filter is active and this event did not match the filters. | |
1342 | * | |
1343 | * Returns true if the event is discarded, false otherwise. | |
1344 | */ | |
1345 | static inline bool | |
1346 | __event_trigger_test_discard(struct trace_event_file *file, | |
13292494 | 1347 | struct trace_buffer *buffer, |
dad56ee7 SRRH |
1348 | struct ring_buffer_event *event, |
1349 | void *entry, | |
1350 | enum event_trigger_type *tt) | |
1351 | { | |
1352 | unsigned long eflags = file->flags; | |
1353 | ||
1354 | if (eflags & EVENT_FILE_FL_TRIGGER_COND) | |
b47e3302 | 1355 | *tt = event_triggers_call(file, buffer, entry, event); |
dad56ee7 | 1356 | |
9cbb1506 SRRH |
1357 | if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || |
1358 | (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && | |
1359 | !filter_match_preds(file->filter, entry))) { | |
0fc1b09f | 1360 | __trace_event_discard_commit(buffer, event); |
9cbb1506 SRRH |
1361 | return true; |
1362 | } | |
dad56ee7 | 1363 | |
9cbb1506 | 1364 | return false; |
dad56ee7 SRRH |
1365 | } |
1366 | ||
1367 | /** | |
1368 | * event_trigger_unlock_commit - handle triggers and finish event commit | |
f2cc020d | 1369 | * @file: The file pointer associated with the event |
dad56ee7 SRRH |
1370 | * @buffer: The ring buffer that the event is being written to |
1371 | * @event: The event meta data in the ring buffer | |
1372 | * @entry: The event itself | |
36590c50 | 1373 | * @trace_ctx: The tracing context flags. |
dad56ee7 SRRH |
1374 | * |
1375 | * This is a helper function to handle triggers that require data | |
1376 | * from the event itself. It also tests the event against filters and | |
1377 | * if the event is soft disabled and should be discarded. | |
1378 | */ | |
1379 | static inline void | |
1380 | event_trigger_unlock_commit(struct trace_event_file *file, | |
13292494 | 1381 | struct trace_buffer *buffer, |
dad56ee7 | 1382 | struct ring_buffer_event *event, |
36590c50 | 1383 | void *entry, unsigned int trace_ctx) |
dad56ee7 SRRH |
1384 | { |
1385 | enum event_trigger_type tt = ETT_NONE; | |
1386 | ||
1387 | if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) | |
36590c50 | 1388 | trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx); |
dad56ee7 SRRH |
1389 | |
1390 | if (tt) | |
c94e45bc | 1391 | event_triggers_post_call(file, tt); |
dad56ee7 SRRH |
1392 | } |
1393 | ||
1394 | /** | |
1395 | * event_trigger_unlock_commit_regs - handle triggers and finish event commit | |
f2cc020d | 1396 | * @file: The file pointer associated with the event |
dad56ee7 SRRH |
1397 | * @buffer: The ring buffer that the event is being written to |
1398 | * @event: The event meta data in the ring buffer | |
1399 | * @entry: The event itself | |
36590c50 | 1400 | * @trace_ctx: The tracing context flags. |
dad56ee7 SRRH |
1401 | * |
1402 | * This is a helper function to handle triggers that require data | |
1403 | * from the event itself. It also tests the event against filters and | |
1404 | * if the event is soft disabled and should be discarded. | |
1405 | * | |
1406 | * Same as event_trigger_unlock_commit() but calls | |
1407 | * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). | |
1408 | */ | |
1409 | static inline void | |
1410 | event_trigger_unlock_commit_regs(struct trace_event_file *file, | |
13292494 | 1411 | struct trace_buffer *buffer, |
dad56ee7 | 1412 | struct ring_buffer_event *event, |
36590c50 | 1413 | void *entry, unsigned int trace_ctx, |
dad56ee7 SRRH |
1414 | struct pt_regs *regs) |
1415 | { | |
1416 | enum event_trigger_type tt = ETT_NONE; | |
1417 | ||
1418 | if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) | |
1419 | trace_buffer_unlock_commit_regs(file->tr, buffer, event, | |
36590c50 | 1420 | trace_ctx, regs); |
dad56ee7 SRRH |
1421 | |
1422 | if (tt) | |
c94e45bc | 1423 | event_triggers_post_call(file, tt); |
dad56ee7 SRRH |
1424 | } |
1425 | ||
61e9dea2 SR |
1426 | #define FILTER_PRED_INVALID ((unsigned short)-1) |
1427 | #define FILTER_PRED_IS_RIGHT (1 << 15) | |
43cd4145 | 1428 | #define FILTER_PRED_FOLD (1 << 15) |
61e9dea2 | 1429 | |
bf93f9ed SR |
1430 | /* |
1431 | * The max preds is the size of unsigned short with | |
1432 | * two flags at the MSBs. One bit is used for both the IS_RIGHT | |
1433 | * and FOLD flags. The other is reserved. | |
1434 | * | |
1435 | * 2^14 preds is way more than enough. | |
1436 | */ | |
1437 | #define MAX_FILTER_PRED 16384 | |
4a3d27e9 | 1438 | |
7ce7e424 | 1439 | struct filter_pred; |
1889d209 | 1440 | struct regex; |
7ce7e424 | 1441 | |
58d9a597 | 1442 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); |
7ce7e424 | 1443 | |
1889d209 FW |
1444 | typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
1445 | ||
3f6fe06d | 1446 | enum regex_type { |
b0f1a59a | 1447 | MATCH_FULL = 0, |
3f6fe06d FW |
1448 | MATCH_FRONT_ONLY, |
1449 | MATCH_MIDDLE_ONLY, | |
1450 | MATCH_END_ONLY, | |
60f1d5e3 | 1451 | MATCH_GLOB, |
f79b3f33 | 1452 | MATCH_INDEX, |
3f6fe06d FW |
1453 | }; |
1454 | ||
1889d209 FW |
1455 | struct regex { |
1456 | char pattern[MAX_FILTER_STR_VAL]; | |
1457 | int len; | |
1458 | int field_len; | |
1459 | regex_match_func match; | |
1460 | }; | |
1461 | ||
7ce7e424 | 1462 | struct filter_pred { |
1889d209 FW |
1463 | filter_pred_fn_t fn; |
1464 | u64 val; | |
1465 | struct regex regex; | |
61aaef55 | 1466 | unsigned short *ops; |
1d0e78e3 | 1467 | struct ftrace_event_field *field; |
1889d209 | 1468 | int offset; |
80765597 | 1469 | int not; |
1889d209 | 1470 | int op; |
7ce7e424 TZ |
1471 | }; |
1472 | ||
4ef56902 TZ |
1473 | static inline bool is_string_field(struct ftrace_event_field *field) |
1474 | { | |
1475 | return field->filter_type == FILTER_DYN_STRING || | |
1476 | field->filter_type == FILTER_STATIC_STRING || | |
4c738413 SRV |
1477 | field->filter_type == FILTER_PTR_STRING || |
1478 | field->filter_type == FILTER_COMM; | |
4ef56902 TZ |
1479 | } |
1480 | ||
1481 | static inline bool is_function_field(struct ftrace_event_field *field) | |
1482 | { | |
1483 | return field->filter_type == FILTER_TRACE_FN; | |
1484 | } | |
1485 | ||
3f6fe06d FW |
1486 | extern enum regex_type |
1487 | filter_parse_regex(char *buff, int len, char **search, int *not); | |
7f1d2f82 | 1488 | extern void print_event_filter(struct trace_event_file *file, |
4bda2d51 | 1489 | struct trace_seq *s); |
7f1d2f82 | 1490 | extern int apply_event_filter(struct trace_event_file *file, |
8b372562 | 1491 | char *filter_string); |
7967b3e0 | 1492 | extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, |
8b372562 TZ |
1493 | char *filter_string); |
1494 | extern void print_subsystem_event_filter(struct event_subsystem *system, | |
ac1adc55 | 1495 | struct trace_seq *s); |
aa38e9fc | 1496 | extern int filter_assign_type(const char *type); |
1e144d73 SRV |
1497 | extern int create_event_filter(struct trace_array *tr, |
1498 | struct trace_event_call *call, | |
bac5fb97 TZ |
1499 | char *filter_str, bool set_str, |
1500 | struct event_filter **filterp); | |
1501 | extern void free_event_filter(struct event_filter *filter); | |
7ce7e424 | 1502 | |
b3a8c6fd | 1503 | struct ftrace_event_field * |
2425bcb9 | 1504 | trace_find_event_field(struct trace_event_call *call, char *name); |
2e33af02 | 1505 | |
e870e9a1 | 1506 | extern void trace_event_enable_cmd_record(bool enable); |
d914ba37 JF |
1507 | extern void trace_event_enable_tgid_record(bool enable); |
1508 | ||
58b92547 | 1509 | extern int event_trace_init(void); |
277ba044 | 1510 | extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); |
0c8916c3 | 1511 | extern int event_trace_del_tracer(struct trace_array *tr); |
720dee53 | 1512 | extern void __trace_early_add_events(struct trace_array *tr); |
e870e9a1 | 1513 | |
3c96529c SRV |
1514 | extern struct trace_event_file *__find_event_file(struct trace_array *tr, |
1515 | const char *system, | |
1516 | const char *event); | |
7f1d2f82 SRRH |
1517 | extern struct trace_event_file *find_event_file(struct trace_array *tr, |
1518 | const char *system, | |
1519 | const char *event); | |
7862ad18 | 1520 | |
85f2b082 TZ |
1521 | static inline void *event_file_data(struct file *filp) |
1522 | { | |
6aa7de05 | 1523 | return READ_ONCE(file_inode(filp)->i_private); |
85f2b082 TZ |
1524 | } |
1525 | ||
20c8928a | 1526 | extern struct mutex event_mutex; |
a59fd602 | 1527 | extern struct list_head ftrace_events; |
ac199db0 | 1528 | |
85f2b082 | 1529 | extern const struct file_operations event_trigger_fops; |
7ef224d1 | 1530 | extern const struct file_operations event_hist_fops; |
2d19bd79 | 1531 | extern const struct file_operations event_hist_debug_fops; |
6c3edaf9 | 1532 | extern const struct file_operations event_inject_fops; |
7ef224d1 TZ |
1533 | |
1534 | #ifdef CONFIG_HIST_TRIGGERS | |
1535 | extern int register_trigger_hist_cmd(void); | |
d0bad49b | 1536 | extern int register_trigger_hist_enable_disable_cmds(void); |
7ef224d1 TZ |
1537 | #else |
1538 | static inline int register_trigger_hist_cmd(void) { return 0; } | |
d0bad49b | 1539 | static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } |
7ef224d1 | 1540 | #endif |
85f2b082 TZ |
1541 | |
1542 | extern int register_trigger_cmds(void); | |
1543 | extern void clear_event_triggers(struct trace_array *tr); | |
1544 | ||
1545 | struct event_trigger_data { | |
1546 | unsigned long count; | |
1547 | int ref; | |
1548 | struct event_trigger_ops *ops; | |
1549 | struct event_command *cmd_ops; | |
d8a30f20 | 1550 | struct event_filter __rcu *filter; |
85f2b082 TZ |
1551 | char *filter_str; |
1552 | void *private_data; | |
104f2810 | 1553 | bool paused; |
db1388b4 | 1554 | bool paused_tmp; |
85f2b082 | 1555 | struct list_head list; |
db1388b4 TZ |
1556 | char *name; |
1557 | struct list_head named_list; | |
1558 | struct event_trigger_data *named_data; | |
85f2b082 TZ |
1559 | }; |
1560 | ||
d0bad49b TZ |
1561 | /* Avoid typos */ |
1562 | #define ENABLE_EVENT_STR "enable_event" | |
1563 | #define DISABLE_EVENT_STR "disable_event" | |
1564 | #define ENABLE_HIST_STR "enable_hist" | |
1565 | #define DISABLE_HIST_STR "disable_hist" | |
1566 | ||
1567 | struct enable_trigger_data { | |
1568 | struct trace_event_file *file; | |
1569 | bool enable; | |
1570 | bool hist; | |
1571 | }; | |
1572 | ||
1573 | extern int event_enable_trigger_print(struct seq_file *m, | |
1574 | struct event_trigger_ops *ops, | |
1575 | struct event_trigger_data *data); | |
1576 | extern void event_enable_trigger_free(struct event_trigger_ops *ops, | |
1577 | struct event_trigger_data *data); | |
1578 | extern int event_enable_trigger_func(struct event_command *cmd_ops, | |
1579 | struct trace_event_file *file, | |
1580 | char *glob, char *cmd, char *param); | |
1581 | extern int event_enable_register_trigger(char *glob, | |
1582 | struct event_trigger_ops *ops, | |
1583 | struct event_trigger_data *data, | |
1584 | struct trace_event_file *file); | |
1585 | extern void event_enable_unregister_trigger(char *glob, | |
1586 | struct event_trigger_ops *ops, | |
1587 | struct event_trigger_data *test, | |
1588 | struct trace_event_file *file); | |
ab4bf008 TZ |
1589 | extern void trigger_data_free(struct event_trigger_data *data); |
1590 | extern int event_trigger_init(struct event_trigger_ops *ops, | |
1591 | struct event_trigger_data *data); | |
1592 | extern int trace_event_trigger_enable_disable(struct trace_event_file *file, | |
1593 | int trigger_enable); | |
1594 | extern void update_cond_flag(struct trace_event_file *file); | |
ab4bf008 TZ |
1595 | extern int set_trigger_filter(char *filter_str, |
1596 | struct event_trigger_data *trigger_data, | |
1597 | struct trace_event_file *file); | |
db1388b4 TZ |
1598 | extern struct event_trigger_data *find_named_trigger(const char *name); |
1599 | extern bool is_named_trigger(struct event_trigger_data *test); | |
1600 | extern int save_named_trigger(const char *name, | |
1601 | struct event_trigger_data *data); | |
1602 | extern void del_named_trigger(struct event_trigger_data *data); | |
1603 | extern void pause_named_trigger(struct event_trigger_data *data); | |
1604 | extern void unpause_named_trigger(struct event_trigger_data *data); | |
1605 | extern void set_named_trigger_data(struct event_trigger_data *data, | |
1606 | struct event_trigger_data *named_data); | |
067fe038 TZ |
1607 | extern struct event_trigger_data * |
1608 | get_named_trigger_data(struct event_trigger_data *data); | |
ab4bf008 | 1609 | extern int register_event_command(struct event_command *cmd); |
d0bad49b TZ |
1610 | extern int unregister_event_command(struct event_command *cmd); |
1611 | extern int register_trigger_hist_enable_disable_cmds(void); | |
ab4bf008 | 1612 | |
85f2b082 TZ |
1613 | /** |
1614 | * struct event_trigger_ops - callbacks for trace event triggers | |
1615 | * | |
1616 | * The methods in this structure provide per-event trigger hooks for | |
1617 | * various trigger operations. | |
1618 | * | |
1619 | * All the methods below, except for @init() and @free(), must be | |
1620 | * implemented. | |
1621 | * | |
1622 | * @func: The trigger 'probe' function called when the triggering | |
1623 | * event occurs. The data passed into this callback is the data | |
1624 | * that was supplied to the event_command @reg() function that | |
c4a59230 TZ |
1625 | * registered the trigger (see struct event_command) along with |
1626 | * the trace record, rec. | |
85f2b082 TZ |
1627 | * |
1628 | * @init: An optional initialization function called for the trigger | |
1629 | * when the trigger is registered (via the event_command reg() | |
1630 | * function). This can be used to perform per-trigger | |
1631 | * initialization such as incrementing a per-trigger reference | |
1632 | * count, for instance. This is usually implemented by the | |
1633 | * generic utility function @event_trigger_init() (see | |
1634 | * trace_event_triggers.c). | |
1635 | * | |
1636 | * @free: An optional de-initialization function called for the | |
1637 | * trigger when the trigger is unregistered (via the | |
1638 | * event_command @reg() function). This can be used to perform | |
1639 | * per-trigger de-initialization such as decrementing a | |
1640 | * per-trigger reference count and freeing corresponding trigger | |
1641 | * data, for instance. This is usually implemented by the | |
1642 | * generic utility function @event_trigger_free() (see | |
1643 | * trace_event_triggers.c). | |
1644 | * | |
1645 | * @print: The callback function invoked to have the trigger print | |
1646 | * itself. This is usually implemented by a wrapper function | |
1647 | * that calls the generic utility function @event_trigger_print() | |
1648 | * (see trace_event_triggers.c). | |
1649 | */ | |
1650 | struct event_trigger_ops { | |
c4a59230 | 1651 | void (*func)(struct event_trigger_data *data, |
b47e3302 | 1652 | struct trace_buffer *buffer, void *rec, |
1ac4f51c | 1653 | struct ring_buffer_event *rbe); |
85f2b082 TZ |
1654 | int (*init)(struct event_trigger_ops *ops, |
1655 | struct event_trigger_data *data); | |
1656 | void (*free)(struct event_trigger_ops *ops, | |
1657 | struct event_trigger_data *data); | |
1658 | int (*print)(struct seq_file *m, | |
1659 | struct event_trigger_ops *ops, | |
1660 | struct event_trigger_data *data); | |
1661 | }; | |
1662 | ||
1663 | /** | |
1664 | * struct event_command - callbacks and data members for event commands | |
1665 | * | |
1666 | * Event commands are invoked by users by writing the command name | |
1667 | * into the 'trigger' file associated with a trace event. The | |
1668 | * parameters associated with a specific invocation of an event | |
1669 | * command are used to create an event trigger instance, which is | |
1670 | * added to the list of trigger instances associated with that trace | |
1671 | * event. When the event is hit, the set of triggers associated with | |
1672 | * that event is invoked. | |
1673 | * | |
1674 | * The data members in this structure provide per-event command data | |
1675 | * for various event commands. | |
1676 | * | |
1677 | * All the data members below, except for @post_trigger, must be set | |
1678 | * for each event command. | |
1679 | * | |
1680 | * @name: The unique name that identifies the event command. This is | |
1681 | * the name used when setting triggers via trigger files. | |
1682 | * | |
1683 | * @trigger_type: A unique id that identifies the event command | |
1684 | * 'type'. This value has two purposes, the first to ensure that | |
1685 | * only one trigger of the same type can be set at a given time | |
1686 | * for a particular event e.g. it doesn't make sense to have both | |
1687 | * a traceon and traceoff trigger attached to a single event at | |
1688 | * the same time, so traceon and traceoff have the same type | |
1689 | * though they have different names. The @trigger_type value is | |
1690 | * also used as a bit value for deferring the actual trigger | |
1691 | * action until after the current event is finished. Some | |
1692 | * commands need to do this if they themselves log to the trace | |
1693 | * buffer (see the @post_trigger() member below). @trigger_type | |
1694 | * values are defined by adding new values to the trigger_type | |
af658dca | 1695 | * enum in include/linux/trace_events.h. |
85f2b082 | 1696 | * |
353206f5 | 1697 | * @flags: See the enum event_command_flags below. |
a5863dae | 1698 | * |
a88e1cfb TZ |
1699 | * All the methods below, except for @set_filter() and @unreg_all(), |
1700 | * must be implemented. | |
85f2b082 TZ |
1701 | * |
1702 | * @func: The callback function responsible for parsing and | |
1703 | * registering the trigger written to the 'trigger' file by the | |
1704 | * user. It allocates the trigger instance and registers it with | |
1705 | * the appropriate trace event. It makes use of the other | |
1706 | * event_command callback functions to orchestrate this, and is | |
1707 | * usually implemented by the generic utility function | |
1708 | * @event_trigger_callback() (see trace_event_triggers.c). | |
1709 | * | |
1710 | * @reg: Adds the trigger to the list of triggers associated with the | |
1711 | * event, and enables the event trigger itself, after | |
1712 | * initializing it (via the event_trigger_ops @init() function). | |
1713 | * This is also where commands can use the @trigger_type value to | |
1714 | * make the decision as to whether or not multiple instances of | |
1715 | * the trigger should be allowed. This is usually implemented by | |
1716 | * the generic utility function @register_trigger() (see | |
1717 | * trace_event_triggers.c). | |
1718 | * | |
1719 | * @unreg: Removes the trigger from the list of triggers associated | |
1720 | * with the event, and disables the event trigger itself, after | |
1721 | * initializing it (via the event_trigger_ops @free() function). | |
1722 | * This is usually implemented by the generic utility function | |
1723 | * @unregister_trigger() (see trace_event_triggers.c). | |
1724 | * | |
a88e1cfb TZ |
1725 | * @unreg_all: An optional function called to remove all the triggers |
1726 | * from the list of triggers associated with the event. Called | |
1727 | * when a trigger file is opened in truncate mode. | |
1728 | * | |
85f2b082 TZ |
1729 | * @set_filter: An optional function called to parse and set a filter |
1730 | * for the trigger. If no @set_filter() method is set for the | |
1731 | * event command, filters set by the user for the command will be | |
1732 | * ignored. This is usually implemented by the generic utility | |
1733 | * function @set_trigger_filter() (see trace_event_triggers.c). | |
1734 | * | |
1735 | * @get_trigger_ops: The callback function invoked to retrieve the | |
1736 | * event_trigger_ops implementation associated with the command. | |
1737 | */ | |
1738 | struct event_command { | |
1739 | struct list_head list; | |
1740 | char *name; | |
1741 | enum event_trigger_type trigger_type; | |
353206f5 | 1742 | int flags; |
85f2b082 | 1743 | int (*func)(struct event_command *cmd_ops, |
7f1d2f82 | 1744 | struct trace_event_file *file, |
85f2b082 TZ |
1745 | char *glob, char *cmd, char *params); |
1746 | int (*reg)(char *glob, | |
1747 | struct event_trigger_ops *ops, | |
1748 | struct event_trigger_data *data, | |
7f1d2f82 | 1749 | struct trace_event_file *file); |
85f2b082 TZ |
1750 | void (*unreg)(char *glob, |
1751 | struct event_trigger_ops *ops, | |
1752 | struct event_trigger_data *data, | |
7f1d2f82 | 1753 | struct trace_event_file *file); |
a88e1cfb | 1754 | void (*unreg_all)(struct trace_event_file *file); |
85f2b082 TZ |
1755 | int (*set_filter)(char *filter_str, |
1756 | struct event_trigger_data *data, | |
7f1d2f82 | 1757 | struct trace_event_file *file); |
85f2b082 TZ |
1758 | struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); |
1759 | }; | |
1760 | ||
353206f5 SRRH |
1761 | /** |
1762 | * enum event_command_flags - flags for struct event_command | |
1763 | * | |
1764 | * @POST_TRIGGER: A flag that says whether or not this command needs | |
1765 | * to have its action delayed until after the current event has | |
1766 | * been closed. Some triggers need to avoid being invoked while | |
1767 | * an event is currently in the process of being logged, since | |
1768 | * the trigger may itself log data into the trace buffer. Thus | |
1769 | * we make sure the current event is committed before invoking | |
1770 | * those triggers. To do that, the trigger invocation is split | |
1771 | * in two - the first part checks the filter using the current | |
1772 | * trace record; if a command has the @post_trigger flag set, it | |
1773 | * sets a bit for itself in the return value, otherwise it | |
1774 | * directly invokes the trigger. Once all commands have been | |
1775 | * either invoked or set their return flag, the current record is | |
1776 | * either committed or discarded. At that point, if any commands | |
1777 | * have deferred their triggers, those commands are finally | |
1778 | * invoked following the close of the current event. In other | |
1779 | * words, if the event_trigger_ops @func() probe implementation | |
1780 | * itself logs to the trace buffer, this flag should be set, | |
1781 | * otherwise it can be left unspecified. | |
1782 | * | |
1783 | * @NEEDS_REC: A flag that says whether or not this command needs | |
1784 | * access to the trace record in order to perform its function, | |
1785 | * regardless of whether or not it has a filter associated with | |
1786 | * it (filters make a trigger require access to the trace record | |
1787 | * but are not always present). | |
1788 | */ | |
1789 | enum event_command_flags { | |
1790 | EVENT_CMD_FL_POST_TRIGGER = 1, | |
1791 | EVENT_CMD_FL_NEEDS_REC = 2, | |
1792 | }; | |
1793 | ||
1794 | static inline bool event_command_post_trigger(struct event_command *cmd_ops) | |
1795 | { | |
1796 | return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; | |
1797 | } | |
1798 | ||
1799 | static inline bool event_command_needs_rec(struct event_command *cmd_ops) | |
1800 | { | |
1801 | return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; | |
1802 | } | |
1803 | ||
7f1d2f82 | 1804 | extern int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 | 1805 | int enable, int soft_disable); |
93e31ffb | 1806 | extern int tracing_alloc_snapshot(void); |
a35873a0 TZ |
1807 | extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data); |
1808 | extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update); | |
1809 | ||
1810 | extern int tracing_snapshot_cond_disable(struct trace_array *tr); | |
1811 | extern void *tracing_cond_snapshot_data(struct trace_array *tr); | |
85f2b082 | 1812 | |
e9fb2b6d SR |
1813 | extern const char *__start___trace_bprintk_fmt[]; |
1814 | extern const char *__stop___trace_bprintk_fmt[]; | |
1815 | ||
102c9323 SRRH |
1816 | extern const char *__start___tracepoint_str[]; |
1817 | extern const char *__stop___tracepoint_str[]; | |
1818 | ||
b9f9108c | 1819 | void trace_printk_control(bool enabled); |
81698831 | 1820 | void trace_printk_start_comm(void); |
613f04a0 | 1821 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); |
2b6080f2 | 1822 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); |
07d777fe | 1823 | |
5c3469cb MH |
1824 | /* Used from boot time tracer */ |
1825 | extern int trace_set_options(struct trace_array *tr, char *option); | |
1826 | extern int tracing_set_tracer(struct trace_array *tr, const char *buf); | |
1827 | extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr, | |
1828 | unsigned long size, int cpu_id); | |
1829 | extern int tracing_set_cpumask(struct trace_array *tr, | |
1830 | cpumask_var_t tracing_cpumask_new); | |
1831 | ||
1832 | ||
7e465baa TZ |
1833 | #define MAX_EVENT_NAME_LEN 64 |
1834 | ||
7e465baa TZ |
1835 | extern ssize_t trace_parse_run_command(struct file *file, |
1836 | const char __user *buffer, size_t count, loff_t *ppos, | |
d262271d | 1837 | int (*createfn)(const char *)); |
7e465baa | 1838 | |
8a062902 | 1839 | extern unsigned int err_pos(char *cmd, const char *str); |
2f754e77 SRV |
1840 | extern void tracing_log_err(struct trace_array *tr, |
1841 | const char *loc, const char *cmd, | |
8a062902 TZ |
1842 | const char **errs, u8 type, u8 pos); |
1843 | ||
ca268da6 SRRH |
1844 | /* |
1845 | * Normal trace_printk() and friends allocates special buffers | |
1846 | * to do the manipulation, as well as saves the print formats | |
1847 | * into sections to display. But the trace infrastructure wants | |
1848 | * to use these without the added overhead at the price of being | |
1849 | * a bit slower (used mainly for warnings, where we don't care | |
1850 | * about performance). The internal_trace_puts() is for such | |
1851 | * a purpose. | |
1852 | */ | |
1853 | #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) | |
1854 | ||
4e5292ea | 1855 | #undef FTRACE_ENTRY |
04ae87a5 | 1856 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \ |
2425bcb9 | 1857 | extern struct trace_event_call \ |
52f5684c | 1858 | __aligned(4) event_##call; |
4e5292ea | 1859 | #undef FTRACE_ENTRY_DUP |
04ae87a5 PZ |
1860 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \ |
1861 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) | |
a4a551b8 | 1862 | #undef FTRACE_ENTRY_PACKED |
04ae87a5 PZ |
1863 | #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \ |
1864 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print)) | |
a4a551b8 | 1865 | |
4e5292ea | 1866 | #include "trace_entries.h" |
e1112b4d | 1867 | |
6e48b550 | 1868 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) |
2425bcb9 | 1869 | int perf_ftrace_event_register(struct trace_event_call *call, |
ced39002 JO |
1870 | enum trace_reg type, void *data); |
1871 | #else | |
1872 | #define perf_ftrace_event_register NULL | |
6e48b550 | 1873 | #endif |
ced39002 | 1874 | |
5f893b26 SRRH |
1875 | #ifdef CONFIG_FTRACE_SYSCALLS |
1876 | void init_ftrace_syscalls(void); | |
dbfeaa7a | 1877 | const char *get_syscall_name(int syscall); |
5f893b26 SRRH |
1878 | #else |
1879 | static inline void init_ftrace_syscalls(void) { } | |
dbfeaa7a TZ |
1880 | static inline const char *get_syscall_name(int syscall) |
1881 | { | |
1882 | return NULL; | |
1883 | } | |
5f893b26 SRRH |
1884 | #endif |
1885 | ||
1886 | #ifdef CONFIG_EVENT_TRACING | |
1887 | void trace_event_init(void); | |
f57a4143 | 1888 | void trace_event_eval_update(struct trace_eval_map **map, int len); |
5c3469cb MH |
1889 | /* Used from boot time tracer */ |
1890 | extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set); | |
1891 | extern int trigger_process_regex(struct trace_event_file *file, char *buff); | |
5f893b26 SRRH |
1892 | #else |
1893 | static inline void __init trace_event_init(void) { } | |
f57a4143 | 1894 | static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { } |
5f893b26 SRRH |
1895 | #endif |
1896 | ||
2824f503 SRV |
1897 | #ifdef CONFIG_TRACER_SNAPSHOT |
1898 | void tracing_snapshot_instance(struct trace_array *tr); | |
1899 | int tracing_alloc_snapshot_instance(struct trace_array *tr); | |
1900 | #else | |
1901 | static inline void tracing_snapshot_instance(struct trace_array *tr) { } | |
1902 | static inline int tracing_alloc_snapshot_instance(struct trace_array *tr) | |
1903 | { | |
1904 | return 0; | |
1905 | } | |
1906 | #endif | |
1907 | ||
3f1756dc SRV |
1908 | #ifdef CONFIG_PREEMPT_TRACER |
1909 | void tracer_preempt_on(unsigned long a0, unsigned long a1); | |
1910 | void tracer_preempt_off(unsigned long a0, unsigned long a1); | |
1911 | #else | |
1912 | static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { } | |
1913 | static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { } | |
1914 | #endif | |
1915 | #ifdef CONFIG_IRQSOFF_TRACER | |
1916 | void tracer_hardirqs_on(unsigned long a0, unsigned long a1); | |
1917 | void tracer_hardirqs_off(unsigned long a0, unsigned long a1); | |
1918 | #else | |
1919 | static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { } | |
1920 | static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { } | |
1921 | #endif | |
1922 | ||
0daa2302 | 1923 | extern struct trace_iterator *tracepoint_print_iter; |
5f893b26 | 1924 | |
0c97bf86 MO |
1925 | /* |
1926 | * Reset the state of the trace_iterator so that it can read consumed data. | |
1927 | * Normally, the trace_iterator is used for reading the data when it is not | |
1928 | * consumed, and must retain state. | |
1929 | */ | |
1930 | static __always_inline void trace_iterator_reset(struct trace_iterator *iter) | |
1931 | { | |
1932 | const size_t offset = offsetof(struct trace_iterator, seq); | |
1933 | ||
1934 | /* | |
1935 | * Keep gcc from complaining about overwriting more than just one | |
1936 | * member in the structure. | |
1937 | */ | |
1938 | memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset); | |
1939 | ||
1940 | iter->pos = -1; | |
1941 | } | |
1942 | ||
42d120e2 TZ |
1943 | /* Check the name is good for event/group/fields */ |
1944 | static inline bool is_good_name(const char *name) | |
1945 | { | |
1946 | if (!isalpha(*name) && *name != '_') | |
1947 | return false; | |
1948 | while (*++name != '\0') { | |
1949 | if (!isalpha(*name) && !isdigit(*name) && *name != '_') | |
1950 | return false; | |
1951 | } | |
1952 | return true; | |
1953 | } | |
1954 | ||
bc0c38d1 | 1955 | #endif /* _LINUX_KERNEL_TRACE_H */ |