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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> |
60f1d5e3 | 18 | #include <linux/glob.h> |
9504504c | 19 | |
12ab74ee SR |
20 | #ifdef CONFIG_FTRACE_SYSCALLS |
21 | #include <asm/unistd.h> /* For NR_SYSCALLS */ | |
22 | #include <asm/syscall.h> /* some archs define it here */ | |
23 | #endif | |
24 | ||
72829bc3 TG |
25 | enum trace_type { |
26 | __TRACE_FIRST_TYPE = 0, | |
27 | ||
28 | TRACE_FN, | |
29 | TRACE_CTX, | |
30 | TRACE_WAKE, | |
31 | TRACE_STACK, | |
dd0e545f | 32 | TRACE_PRINT, |
48ead020 | 33 | TRACE_BPRINT, |
bd8ac686 PP |
34 | TRACE_MMIO_RW, |
35 | TRACE_MMIO_MAP, | |
9f029e83 | 36 | TRACE_BRANCH, |
287b6e68 FW |
37 | TRACE_GRAPH_RET, |
38 | TRACE_GRAPH_ENT, | |
02b67518 | 39 | TRACE_USER_STACK, |
c71a8961 | 40 | TRACE_BLK, |
09ae7234 | 41 | TRACE_BPUTS, |
e7c15cd8 | 42 | TRACE_HWLAT, |
72829bc3 | 43 | |
f0868d1e | 44 | __TRACE_LAST_TYPE, |
72829bc3 TG |
45 | }; |
46 | ||
bc0c38d1 | 47 | |
0a1c49db SR |
48 | #undef __field |
49 | #define __field(type, item) type item; | |
86387f7e | 50 | |
d7315094 SR |
51 | #undef __field_struct |
52 | #define __field_struct(type, item) __field(type, item) | |
86387f7e | 53 | |
d7315094 SR |
54 | #undef __field_desc |
55 | #define __field_desc(type, container, item) | |
02b67518 | 56 | |
0a1c49db SR |
57 | #undef __array |
58 | #define __array(type, item, size) type item[size]; | |
1427cdf0 | 59 | |
d7315094 SR |
60 | #undef __array_desc |
61 | #define __array_desc(type, container, item, size) | |
777e208d | 62 | |
0a1c49db SR |
63 | #undef __dynamic_array |
64 | #define __dynamic_array(type, item) type item[]; | |
777e208d | 65 | |
0a1c49db SR |
66 | #undef F_STRUCT |
67 | #define F_STRUCT(args...) args | |
74239072 | 68 | |
0a1c49db | 69 | #undef FTRACE_ENTRY |
02aa3162 JO |
70 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
71 | struct struct_name { \ | |
72 | struct trace_entry ent; \ | |
73 | tstruct \ | |
0a1c49db | 74 | } |
777e208d | 75 | |
0a1c49db | 76 | #undef FTRACE_ENTRY_DUP |
02aa3162 | 77 | #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) |
1e9b51c2 | 78 | |
e59a0bff | 79 | #undef FTRACE_ENTRY_REG |
02aa3162 JO |
80 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ |
81 | filter, regfn) \ | |
82 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
83 | filter) | |
e59a0bff | 84 | |
a4a551b8 NK |
85 | #undef FTRACE_ENTRY_PACKED |
86 | #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print, \ | |
87 | filter) \ | |
88 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
89 | filter) __packed | |
90 | ||
0a1c49db | 91 | #include "trace_entries.h" |
36994e58 | 92 | |
0a1c49db SR |
93 | /* |
94 | * syscalls are special, and need special handling, this is why | |
95 | * they are not included in trace_entries.h | |
96 | */ | |
bed1ffca FW |
97 | struct syscall_trace_enter { |
98 | struct trace_entry ent; | |
99 | int nr; | |
100 | unsigned long args[]; | |
101 | }; | |
102 | ||
103 | struct syscall_trace_exit { | |
104 | struct trace_entry ent; | |
105 | int nr; | |
99df5a6a | 106 | long ret; |
bed1ffca FW |
107 | }; |
108 | ||
93ccae7a | 109 | struct kprobe_trace_entry_head { |
413d37d1 MH |
110 | struct trace_entry ent; |
111 | unsigned long ip; | |
413d37d1 MH |
112 | }; |
113 | ||
93ccae7a | 114 | struct kretprobe_trace_entry_head { |
413d37d1 MH |
115 | struct trace_entry ent; |
116 | unsigned long func; | |
117 | unsigned long ret_ip; | |
413d37d1 MH |
118 | }; |
119 | ||
fc5e27ae PP |
120 | /* |
121 | * trace_flag_type is an enumeration that holds different | |
122 | * states when a trace occurs. These are: | |
9244489a | 123 | * IRQS_OFF - interrupts were disabled |
9de36825 | 124 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
bd9cfca9 | 125 | * NEED_RESCHED - reschedule is requested |
9244489a SR |
126 | * HARDIRQ - inside an interrupt handler |
127 | * SOFTIRQ - inside a softirq handler | |
fc5e27ae PP |
128 | */ |
129 | enum trace_flag_type { | |
130 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
131 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
132 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
133 | TRACE_FLAG_HARDIRQ = 0x08, | |
134 | TRACE_FLAG_SOFTIRQ = 0x10, | |
e5137b50 | 135 | TRACE_FLAG_PREEMPT_RESCHED = 0x20, |
7e6867bf | 136 | TRACE_FLAG_NMI = 0x40, |
fc5e27ae PP |
137 | }; |
138 | ||
5bf9a1ee | 139 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 | 140 | |
2b6080f2 SR |
141 | struct trace_array; |
142 | ||
bc0c38d1 SR |
143 | /* |
144 | * The CPU trace array - it consists of thousands of trace entries | |
145 | * plus some other descriptor data: (for example which task started | |
146 | * the trace, etc.) | |
147 | */ | |
148 | struct trace_array_cpu { | |
bc0c38d1 | 149 | atomic_t disabled; |
2cadf913 | 150 | void *buffer_page; /* ring buffer spare */ |
4e3c3333 | 151 | |
438ced17 | 152 | unsigned long entries; |
bc0c38d1 SR |
153 | unsigned long saved_latency; |
154 | unsigned long critical_start; | |
155 | unsigned long critical_end; | |
156 | unsigned long critical_sequence; | |
157 | unsigned long nice; | |
158 | unsigned long policy; | |
159 | unsigned long rt_priority; | |
2f26ebd5 | 160 | unsigned long skipped_entries; |
bc0c38d1 SR |
161 | cycle_t preempt_timestamp; |
162 | pid_t pid; | |
d20b92ab | 163 | kuid_t uid; |
bc0c38d1 | 164 | char comm[TASK_COMM_LEN]; |
3fdaf80f SRRH |
165 | |
166 | bool ignore_pid; | |
345ddcc8 SRRH |
167 | #ifdef CONFIG_FUNCTION_TRACER |
168 | bool ftrace_ignore_pid; | |
169 | #endif | |
bc0c38d1 SR |
170 | }; |
171 | ||
2b6080f2 | 172 | struct tracer; |
37aea98b | 173 | struct trace_option_dentry; |
2b6080f2 | 174 | |
12883efb SRRH |
175 | struct trace_buffer { |
176 | struct trace_array *tr; | |
177 | struct ring_buffer *buffer; | |
178 | struct trace_array_cpu __percpu *data; | |
179 | cycle_t time_start; | |
180 | int cpu; | |
181 | }; | |
182 | ||
9a38a885 SRRH |
183 | #define TRACE_FLAGS_MAX_SIZE 32 |
184 | ||
37aea98b SRRH |
185 | struct trace_options { |
186 | struct tracer *tracer; | |
187 | struct trace_option_dentry *topts; | |
188 | }; | |
189 | ||
49090107 | 190 | struct trace_pid_list { |
f4d34a87 SR |
191 | int pid_max; |
192 | unsigned long *pids; | |
49090107 SRRH |
193 | }; |
194 | ||
bc0c38d1 SR |
195 | /* |
196 | * The trace array - an array of per-CPU trace arrays. This is the | |
197 | * highest level data structure that individual tracers deal with. | |
198 | * They have on/off state as well: | |
199 | */ | |
200 | struct trace_array { | |
ae63b31e | 201 | struct list_head list; |
277ba044 | 202 | char *name; |
12883efb SRRH |
203 | struct trace_buffer trace_buffer; |
204 | #ifdef CONFIG_TRACER_MAX_TRACE | |
205 | /* | |
206 | * The max_buffer is used to snapshot the trace when a maximum | |
207 | * latency is reached, or when the user initiates a snapshot. | |
208 | * Some tracers will use this to store a maximum trace while | |
209 | * it continues examining live traces. | |
210 | * | |
211 | * The buffers for the max_buffer are set up the same as the trace_buffer | |
212 | * When a snapshot is taken, the buffer of the max_buffer is swapped | |
213 | * with the buffer of the trace_buffer and the buffers are reset for | |
214 | * the trace_buffer so the tracing can continue. | |
215 | */ | |
216 | struct trace_buffer max_buffer; | |
45ad21ca | 217 | bool allocated_snapshot; |
f971cc9a SRRH |
218 | #endif |
219 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) | |
6d9b3fa5 | 220 | unsigned long max_latency; |
12883efb | 221 | #endif |
49090107 | 222 | struct trace_pid_list __rcu *filtered_pids; |
0b9b12c1 SRRH |
223 | /* |
224 | * max_lock is used to protect the swapping of buffers | |
225 | * when taking a max snapshot. The buffers themselves are | |
226 | * protected by per_cpu spinlocks. But the action of the swap | |
227 | * needs its own lock. | |
228 | * | |
229 | * This is defined as a arch_spinlock_t in order to help | |
230 | * with performance when lockdep debugging is enabled. | |
231 | * | |
232 | * It is also used in other places outside the update_max_tr | |
233 | * so it needs to be defined outside of the | |
234 | * CONFIG_TRACER_MAX_TRACE. | |
235 | */ | |
236 | arch_spinlock_t max_lock; | |
499e5470 | 237 | int buffer_disabled; |
12ab74ee SR |
238 | #ifdef CONFIG_FTRACE_SYSCALLS |
239 | int sys_refcount_enter; | |
240 | int sys_refcount_exit; | |
7f1d2f82 SRRH |
241 | struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; |
242 | struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; | |
12ab74ee | 243 | #endif |
2b6080f2 SR |
244 | int stop_count; |
245 | int clock_id; | |
37aea98b | 246 | int nr_topts; |
2b6080f2 | 247 | struct tracer *current_trace; |
983f938a | 248 | unsigned int trace_flags; |
9a38a885 | 249 | unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; |
ae63b31e | 250 | unsigned int flags; |
2b6080f2 | 251 | raw_spinlock_t start_lock; |
ae63b31e | 252 | struct dentry *dir; |
2b6080f2 SR |
253 | struct dentry *options; |
254 | struct dentry *percpu_dir; | |
ae63b31e | 255 | struct dentry *event_dir; |
37aea98b | 256 | struct trace_options *topts; |
ae63b31e SR |
257 | struct list_head systems; |
258 | struct list_head events; | |
ccfe9e42 | 259 | cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
a695cb58 | 260 | int ref; |
f20a5806 SRRH |
261 | #ifdef CONFIG_FUNCTION_TRACER |
262 | struct ftrace_ops *ops; | |
345ddcc8 | 263 | struct trace_pid_list __rcu *function_pids; |
f20a5806 SRRH |
264 | /* function tracing enabled */ |
265 | int function_enabled; | |
266 | #endif | |
bc0c38d1 SR |
267 | }; |
268 | ||
ae63b31e SR |
269 | enum { |
270 | TRACE_ARRAY_FL_GLOBAL = (1 << 0) | |
271 | }; | |
272 | ||
273 | extern struct list_head ftrace_trace_arrays; | |
274 | ||
a8227415 AL |
275 | extern struct mutex trace_types_lock; |
276 | ||
8e2e2fa4 SRRH |
277 | extern int trace_array_get(struct trace_array *tr); |
278 | extern void trace_array_put(struct trace_array *tr); | |
279 | ||
ae63b31e SR |
280 | /* |
281 | * The global tracer (top) should be the first trace array added, | |
282 | * but we check the flag anyway. | |
283 | */ | |
284 | static inline struct trace_array *top_trace_array(void) | |
285 | { | |
286 | struct trace_array *tr; | |
287 | ||
da9c3413 | 288 | if (list_empty(&ftrace_trace_arrays)) |
dc81e5e3 YY |
289 | return NULL; |
290 | ||
ae63b31e SR |
291 | tr = list_entry(ftrace_trace_arrays.prev, |
292 | typeof(*tr), list); | |
293 | WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); | |
294 | return tr; | |
295 | } | |
296 | ||
7104f300 SR |
297 | #define FTRACE_CMP_TYPE(var, type) \ |
298 | __builtin_types_compatible_p(typeof(var), type *) | |
299 | ||
300 | #undef IF_ASSIGN | |
301 | #define IF_ASSIGN(var, entry, etype, id) \ | |
302 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
303 | var = (typeof(var))(entry); \ | |
304 | WARN_ON(id && (entry)->type != id); \ | |
305 | break; \ | |
306 | } | |
307 | ||
308 | /* Will cause compile errors if type is not found. */ | |
309 | extern void __ftrace_bad_type(void); | |
310 | ||
311 | /* | |
312 | * The trace_assign_type is a verifier that the entry type is | |
313 | * the same as the type being assigned. To add new types simply | |
314 | * add a line with the following format: | |
315 | * | |
316 | * IF_ASSIGN(var, ent, type, id); | |
317 | * | |
318 | * Where "type" is the trace type that includes the trace_entry | |
319 | * as the "ent" item. And "id" is the trace identifier that is | |
320 | * used in the trace_type enum. | |
321 | * | |
322 | * If the type can have more than one id, then use zero. | |
323 | */ | |
324 | #define trace_assign_type(var, ent) \ | |
325 | do { \ | |
326 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
327 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 328 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 329 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 330 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 331 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
09ae7234 | 332 | IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ |
e7c15cd8 | 333 | IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \ |
7104f300 SR |
334 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
335 | TRACE_MMIO_RW); \ | |
336 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
337 | TRACE_MMIO_MAP); \ | |
9f029e83 | 338 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
339 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
340 | TRACE_GRAPH_ENT); \ | |
341 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
342 | TRACE_GRAPH_RET); \ | |
7104f300 SR |
343 | __ftrace_bad_type(); \ |
344 | } while (0) | |
2c4f035f | 345 | |
adf9f195 FW |
346 | /* |
347 | * An option specific to a tracer. This is a boolean value. | |
348 | * The bit is the bit index that sets its value on the | |
349 | * flags value in struct tracer_flags. | |
350 | */ | |
351 | struct tracer_opt { | |
9de36825 IM |
352 | const char *name; /* Will appear on the trace_options file */ |
353 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
354 | }; |
355 | ||
356 | /* | |
357 | * The set of specific options for a tracer. Your tracer | |
358 | * have to set the initial value of the flags val. | |
359 | */ | |
360 | struct tracer_flags { | |
361 | u32 val; | |
9de36825 | 362 | struct tracer_opt *opts; |
d39cdd20 | 363 | struct tracer *trace; |
adf9f195 FW |
364 | }; |
365 | ||
366 | /* Makes more easy to define a tracer opt */ | |
367 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
368 | ||
034939b6 | 369 | |
41d9c0be SRRH |
370 | struct trace_option_dentry { |
371 | struct tracer_opt *opt; | |
372 | struct tracer_flags *flags; | |
373 | struct trace_array *tr; | |
374 | struct dentry *entry; | |
375 | }; | |
376 | ||
6eaaa5d5 | 377 | /** |
8434dc93 | 378 | * struct tracer - a specific tracer and its callbacks to interact with tracefs |
6eaaa5d5 FW |
379 | * @name: the name chosen to select it on the available_tracers file |
380 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
381 | * @reset: called when one switches to another tracer | |
05a724bd CH |
382 | * @start: called when tracing is unpaused (echo 1 > tracing_on) |
383 | * @stop: called when tracing is paused (echo 0 > tracing_on) | |
6508fa76 | 384 | * @update_thresh: called when tracing_thresh is updated |
6eaaa5d5 FW |
385 | * @open: called when the trace file is opened |
386 | * @pipe_open: called when the trace_pipe file is opened | |
6eaaa5d5 | 387 | * @close: called when the trace file is released |
c521efd1 | 388 | * @pipe_close: called when the trace_pipe file is released |
6eaaa5d5 FW |
389 | * @read: override the default read callback on trace_pipe |
390 | * @splice_read: override the default splice_read callback on trace_pipe | |
391 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
392 | * @print_headers: override the first lines that describe your columns | |
393 | * @print_line: callback that prints a trace | |
394 | * @set_flag: signals one of your private flags changed (trace_options file) | |
395 | * @flags: your private flags | |
bc0c38d1 SR |
396 | */ |
397 | struct tracer { | |
398 | const char *name; | |
1c80025a | 399 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 400 | void (*reset)(struct trace_array *tr); |
9036990d SR |
401 | void (*start)(struct trace_array *tr); |
402 | void (*stop)(struct trace_array *tr); | |
6508fa76 | 403 | int (*update_thresh)(struct trace_array *tr); |
bc0c38d1 | 404 | void (*open)(struct trace_iterator *iter); |
107bad8b | 405 | void (*pipe_open)(struct trace_iterator *iter); |
bc0c38d1 | 406 | void (*close)(struct trace_iterator *iter); |
c521efd1 | 407 | void (*pipe_close)(struct trace_iterator *iter); |
107bad8b SR |
408 | ssize_t (*read)(struct trace_iterator *iter, |
409 | struct file *filp, char __user *ubuf, | |
410 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
411 | ssize_t (*splice_read)(struct trace_iterator *iter, |
412 | struct file *filp, | |
413 | loff_t *ppos, | |
414 | struct pipe_inode_info *pipe, | |
415 | size_t len, | |
416 | unsigned int flags); | |
60a11774 SR |
417 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
418 | int (*selftest)(struct tracer *trace, | |
419 | struct trace_array *tr); | |
420 | #endif | |
8bba1bf5 | 421 | void (*print_header)(struct seq_file *m); |
2c4f035f | 422 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 | 423 | /* If you handled the flag setting, return 0 */ |
8c1a49ae SRRH |
424 | int (*set_flag)(struct trace_array *tr, |
425 | u32 old_flags, u32 bit, int set); | |
613f04a0 | 426 | /* Return 0 if OK with change, else return non-zero */ |
bf6065b5 | 427 | int (*flag_changed)(struct trace_array *tr, |
613f04a0 | 428 | u32 mask, int set); |
bc0c38d1 | 429 | struct tracer *next; |
9de36825 | 430 | struct tracer_flags *flags; |
50512ab5 | 431 | int enabled; |
cf6ab6d9 | 432 | int ref; |
f43c738b | 433 | bool print_max; |
607e2ea1 | 434 | bool allow_instances; |
12883efb | 435 | #ifdef CONFIG_TRACER_MAX_TRACE |
f43c738b | 436 | bool use_max_tr; |
12883efb | 437 | #endif |
bc0c38d1 SR |
438 | }; |
439 | ||
f9520750 | 440 | |
e4a3f541 | 441 | /* Only current can touch trace_recursion */ |
e4a3f541 | 442 | |
edc15caf SR |
443 | /* |
444 | * For function tracing recursion: | |
445 | * The order of these bits are important. | |
446 | * | |
447 | * When function tracing occurs, the following steps are made: | |
448 | * If arch does not support a ftrace feature: | |
449 | * call internal function (uses INTERNAL bits) which calls... | |
450 | * If callback is registered to the "global" list, the list | |
451 | * function is called and recursion checks the GLOBAL bits. | |
452 | * then this function calls... | |
453 | * The function callback, which can use the FTRACE bits to | |
454 | * check for recursion. | |
455 | * | |
456 | * Now if the arch does not suppport a feature, and it calls | |
457 | * the global list function which calls the ftrace callback | |
458 | * all three of these steps will do a recursion protection. | |
459 | * There's no reason to do one if the previous caller already | |
460 | * did. The recursion that we are protecting against will | |
461 | * go through the same steps again. | |
462 | * | |
463 | * To prevent the multiple recursion checks, if a recursion | |
464 | * bit is set that is higher than the MAX bit of the current | |
465 | * check, then we know that the check was made by the previous | |
466 | * caller, and we can skip the current check. | |
467 | */ | |
e46cbf75 | 468 | enum { |
567cd4da SR |
469 | TRACE_BUFFER_BIT, |
470 | TRACE_BUFFER_NMI_BIT, | |
471 | TRACE_BUFFER_IRQ_BIT, | |
472 | TRACE_BUFFER_SIRQ_BIT, | |
473 | ||
474 | /* Start of function recursion bits */ | |
475 | TRACE_FTRACE_BIT, | |
edc15caf SR |
476 | TRACE_FTRACE_NMI_BIT, |
477 | TRACE_FTRACE_IRQ_BIT, | |
478 | TRACE_FTRACE_SIRQ_BIT, | |
e46cbf75 | 479 | |
4104d326 | 480 | /* INTERNAL_BITs must be greater than FTRACE_BITs */ |
edc15caf SR |
481 | TRACE_INTERNAL_BIT, |
482 | TRACE_INTERNAL_NMI_BIT, | |
483 | TRACE_INTERNAL_IRQ_BIT, | |
484 | TRACE_INTERNAL_SIRQ_BIT, | |
485 | ||
6224beb1 | 486 | TRACE_BRANCH_BIT, |
e4a3f541 SR |
487 | /* |
488 | * Abuse of the trace_recursion. | |
489 | * As we need a way to maintain state if we are tracing the function | |
490 | * graph in irq because we want to trace a particular function that | |
491 | * was called in irq context but we have irq tracing off. Since this | |
492 | * can only be modified by current, we can reuse trace_recursion. | |
493 | */ | |
e46cbf75 SR |
494 | TRACE_IRQ_BIT, |
495 | }; | |
e4a3f541 | 496 | |
e46cbf75 SR |
497 | #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) |
498 | #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) | |
499 | #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) | |
e4a3f541 | 500 | |
edc15caf SR |
501 | #define TRACE_CONTEXT_BITS 4 |
502 | ||
503 | #define TRACE_FTRACE_START TRACE_FTRACE_BIT | |
504 | #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) | |
505 | ||
edc15caf SR |
506 | #define TRACE_LIST_START TRACE_INTERNAL_BIT |
507 | #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) | |
508 | ||
509 | #define TRACE_CONTEXT_MASK TRACE_LIST_MAX | |
510 | ||
511 | static __always_inline int trace_get_context_bit(void) | |
512 | { | |
513 | int bit; | |
514 | ||
515 | if (in_interrupt()) { | |
516 | if (in_nmi()) | |
517 | bit = 0; | |
518 | ||
519 | else if (in_irq()) | |
520 | bit = 1; | |
521 | else | |
522 | bit = 2; | |
523 | } else | |
524 | bit = 3; | |
525 | ||
526 | return bit; | |
527 | } | |
528 | ||
529 | static __always_inline int trace_test_and_set_recursion(int start, int max) | |
530 | { | |
531 | unsigned int val = current->trace_recursion; | |
532 | int bit; | |
533 | ||
534 | /* A previous recursion check was made */ | |
535 | if ((val & TRACE_CONTEXT_MASK) > max) | |
536 | return 0; | |
537 | ||
538 | bit = trace_get_context_bit() + start; | |
539 | if (unlikely(val & (1 << bit))) | |
540 | return -1; | |
541 | ||
542 | val |= 1 << bit; | |
543 | current->trace_recursion = val; | |
544 | barrier(); | |
545 | ||
546 | return bit; | |
547 | } | |
548 | ||
549 | static __always_inline void trace_clear_recursion(int bit) | |
550 | { | |
551 | unsigned int val = current->trace_recursion; | |
552 | ||
553 | if (!bit) | |
554 | return; | |
555 | ||
556 | bit = 1 << bit; | |
557 | val &= ~bit; | |
558 | ||
559 | barrier(); | |
560 | current->trace_recursion = val; | |
561 | } | |
562 | ||
6d158a81 SR |
563 | static inline struct ring_buffer_iter * |
564 | trace_buffer_iter(struct trace_iterator *iter, int cpu) | |
565 | { | |
566 | if (iter->buffer_iter && iter->buffer_iter[cpu]) | |
567 | return iter->buffer_iter[cpu]; | |
568 | return NULL; | |
569 | } | |
570 | ||
b6f11df2 | 571 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 572 | int tracing_is_enabled(void); |
12883efb SRRH |
573 | void tracing_reset(struct trace_buffer *buf, int cpu); |
574 | void tracing_reset_online_cpus(struct trace_buffer *buf); | |
9456f0fa | 575 | void tracing_reset_current(int cpu); |
873c642f | 576 | void tracing_reset_all_online_cpus(void); |
bc0c38d1 | 577 | int tracing_open_generic(struct inode *inode, struct file *filp); |
2e86421d | 578 | bool tracing_is_disabled(void); |
e7c15cd8 | 579 | int tracer_tracing_is_on(struct trace_array *tr); |
5452af66 | 580 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 581 | umode_t mode, |
5452af66 FW |
582 | struct dentry *parent, |
583 | void *data, | |
584 | const struct file_operations *fops); | |
585 | ||
bc0c38d1 | 586 | struct dentry *tracing_init_dentry(void); |
d618b3e6 | 587 | |
51a763dd ACM |
588 | struct ring_buffer_event; |
589 | ||
e77405ad SR |
590 | struct ring_buffer_event * |
591 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
592 | int type, | |
593 | unsigned long len, | |
594 | unsigned long flags, | |
595 | int pc); | |
51a763dd | 596 | |
45dcd8b8 PP |
597 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
598 | struct trace_array_cpu *data); | |
c4a8e8be FW |
599 | |
600 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
601 | int *ent_cpu, u64 *ent_ts); | |
602 | ||
7ffbd48d SR |
603 | void __buffer_unlock_commit(struct ring_buffer *buffer, |
604 | struct ring_buffer_event *event); | |
605 | ||
955b61e5 JW |
606 | int trace_empty(struct trace_iterator *iter); |
607 | ||
608 | void *trace_find_next_entry_inc(struct trace_iterator *iter); | |
609 | ||
610 | void trace_init_global_iter(struct trace_iterator *iter); | |
611 | ||
612 | void tracing_iter_reset(struct trace_iterator *iter, int cpu); | |
613 | ||
6fb44b71 | 614 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
615 | unsigned long ip, |
616 | unsigned long parent_ip, | |
38697053 | 617 | unsigned long flags, int pc); |
0a772620 JO |
618 | void trace_graph_function(struct trace_array *tr, |
619 | unsigned long ip, | |
620 | unsigned long parent_ip, | |
621 | unsigned long flags, int pc); | |
7e9a49ef | 622 | void trace_latency_header(struct seq_file *m); |
62b915f1 JO |
623 | void trace_default_header(struct seq_file *m); |
624 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter); | |
625 | int trace_empty(struct trace_iterator *iter); | |
bc0c38d1 | 626 | |
287b6e68 | 627 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 628 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1a0799a8 | 629 | void set_graph_array(struct trace_array *tr); |
1e9b51c2 | 630 | |
41bc8144 SR |
631 | void tracing_start_cmdline_record(void); |
632 | void tracing_stop_cmdline_record(void); | |
bc0c38d1 | 633 | int register_tracer(struct tracer *type); |
b5130b1e | 634 | int is_tracing_stopped(void); |
955b61e5 | 635 | |
098c879e SRRH |
636 | loff_t tracing_lseek(struct file *file, loff_t offset, int whence); |
637 | ||
955b61e5 JW |
638 | extern cpumask_var_t __read_mostly tracing_buffer_mask; |
639 | ||
640 | #define for_each_tracing_cpu(cpu) \ | |
641 | for_each_cpu(cpu, tracing_buffer_mask) | |
bc0c38d1 SR |
642 | |
643 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
644 | ||
0e950173 TB |
645 | extern unsigned long tracing_thresh; |
646 | ||
4e267db1 | 647 | /* PID filtering */ |
76c813e2 SRRH |
648 | |
649 | extern int pid_max; | |
650 | ||
4e267db1 SR |
651 | bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, |
652 | pid_t search_pid); | |
653 | bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, | |
654 | struct task_struct *task); | |
655 | void trace_filter_add_remove_task(struct trace_pid_list *pid_list, | |
656 | struct task_struct *self, | |
657 | struct task_struct *task); | |
5cc8976b SRRH |
658 | void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos); |
659 | void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos); | |
660 | int trace_pid_show(struct seq_file *m, void *v); | |
76c813e2 SRRH |
661 | void trace_free_pid_list(struct trace_pid_list *pid_list); |
662 | int trace_pid_write(struct trace_pid_list *filtered_pids, | |
663 | struct trace_pid_list **new_pid_list, | |
664 | const char __user *ubuf, size_t cnt); | |
4e267db1 | 665 | |
5d4a9dba | 666 | #ifdef CONFIG_TRACER_MAX_TRACE |
bc0c38d1 SR |
667 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); |
668 | void update_max_tr_single(struct trace_array *tr, | |
669 | struct task_struct *tsk, int cpu); | |
5d4a9dba | 670 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 671 | |
c0a0d0d3 | 672 | #ifdef CONFIG_STACKTRACE |
e77405ad | 673 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
674 | int pc); |
675 | ||
676 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, | |
677 | int pc); | |
678 | #else | |
e1f7992e | 679 | static inline void ftrace_trace_userstack(struct ring_buffer *buffer, |
c0a0d0d3 FW |
680 | unsigned long flags, int pc) |
681 | { | |
682 | } | |
683 | ||
684 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags, | |
685 | int skip, int pc) | |
686 | { | |
687 | } | |
688 | #endif /* CONFIG_STACKTRACE */ | |
53614991 | 689 | |
e309b41d | 690 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 691 | |
4ca53085 | 692 | extern void trace_find_cmdline(int pid, char comm[]); |
c37775d5 | 693 | extern void trace_event_follow_fork(struct trace_array *tr, bool enable); |
f7d48cbd | 694 | |
bc0c38d1 SR |
695 | #ifdef CONFIG_DYNAMIC_FTRACE |
696 | extern unsigned long ftrace_update_tot_cnt; | |
ad97772a | 697 | #endif |
d05cdb25 SR |
698 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
699 | extern int DYN_FTRACE_TEST_NAME(void); | |
95950c2e SR |
700 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 |
701 | extern int DYN_FTRACE_TEST_NAME2(void); | |
bc0c38d1 | 702 | |
55034cd6 | 703 | extern bool ring_buffer_expanded; |
020e5f85 LZ |
704 | extern bool tracing_selftest_disabled; |
705 | ||
60a11774 | 706 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
707 | extern int trace_selftest_startup_function(struct tracer *trace, |
708 | struct trace_array *tr); | |
7447dce9 FW |
709 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
710 | struct trace_array *tr); | |
60a11774 SR |
711 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
712 | struct trace_array *tr); | |
60a11774 SR |
713 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
714 | struct trace_array *tr); | |
60a11774 SR |
715 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
716 | struct trace_array *tr); | |
60a11774 SR |
717 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
718 | struct trace_array *tr); | |
fb1b6d8b SN |
719 | extern int trace_selftest_startup_nop(struct tracer *trace, |
720 | struct trace_array *tr); | |
60a11774 SR |
721 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
722 | struct trace_array *tr); | |
80e5ea45 SR |
723 | extern int trace_selftest_startup_branch(struct tracer *trace, |
724 | struct trace_array *tr); | |
8f768993 SRRH |
725 | /* |
726 | * Tracer data references selftest functions that only occur | |
727 | * on boot up. These can be __init functions. Thus, when selftests | |
728 | * are enabled, then the tracers need to reference __init functions. | |
729 | */ | |
730 | #define __tracer_data __refdata | |
731 | #else | |
732 | /* Tracers are seldom changed. Optimize when selftests are disabled. */ | |
733 | #define __tracer_data __read_mostly | |
60a11774 SR |
734 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
735 | ||
c7aafc54 | 736 | extern void *head_page(struct trace_array_cpu *data); |
cf8e3474 | 737 | extern unsigned long long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 738 | extern int |
40ce74f1 | 739 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 740 | extern int |
40ce74f1 | 741 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
659372d3 SR |
742 | extern int |
743 | trace_array_vprintk(struct trace_array *tr, | |
744 | unsigned long ip, const char *fmt, va_list args); | |
745 | int trace_array_printk(struct trace_array *tr, | |
746 | unsigned long ip, const char *fmt, ...); | |
12883efb SRRH |
747 | int trace_array_printk_buf(struct ring_buffer *buffer, |
748 | unsigned long ip, const char *fmt, ...); | |
955b61e5 JW |
749 | void trace_printk_seq(struct trace_seq *s); |
750 | enum print_line_t print_trace_line(struct trace_iterator *iter); | |
c7aafc54 | 751 | |
8e1e1df2 BP |
752 | extern char trace_find_mark(unsigned long long duration); |
753 | ||
15e6cb36 | 754 | /* Standard output formatting function used for function return traces */ |
fb52607a | 755 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
62b915f1 JO |
756 | |
757 | /* Flag options */ | |
758 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1 | |
759 | #define TRACE_GRAPH_PRINT_CPU 0x2 | |
760 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 | |
761 | #define TRACE_GRAPH_PRINT_PROC 0x8 | |
762 | #define TRACE_GRAPH_PRINT_DURATION 0x10 | |
763 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 | |
ccdb5946 | 764 | #define TRACE_GRAPH_PRINT_IRQS 0x40 |
607e3a29 | 765 | #define TRACE_GRAPH_PRINT_TAIL 0x80 |
55577204 SRRH |
766 | #define TRACE_GRAPH_SLEEP_TIME 0x100 |
767 | #define TRACE_GRAPH_GRAPH_TIME 0x200 | |
6fc84ea7 SRRH |
768 | #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 |
769 | #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) | |
62b915f1 | 770 | |
55577204 SRRH |
771 | extern void ftrace_graph_sleep_time_control(bool enable); |
772 | extern void ftrace_graph_graph_time_control(bool enable); | |
773 | ||
d7a8d9e9 JO |
774 | extern enum print_line_t |
775 | print_graph_function_flags(struct trace_iterator *iter, u32 flags); | |
776 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags); | |
9d9add34 | 777 | extern void |
0706f1c4 | 778 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); |
62b915f1 JO |
779 | extern void graph_trace_open(struct trace_iterator *iter); |
780 | extern void graph_trace_close(struct trace_iterator *iter); | |
781 | extern int __trace_graph_entry(struct trace_array *tr, | |
782 | struct ftrace_graph_ent *trace, | |
783 | unsigned long flags, int pc); | |
784 | extern void __trace_graph_return(struct trace_array *tr, | |
785 | struct ftrace_graph_ret *trace, | |
786 | unsigned long flags, int pc); | |
787 | ||
ea4e2bc4 SR |
788 | |
789 | #ifdef CONFIG_DYNAMIC_FTRACE | |
790 | /* TODO: make this variable */ | |
791 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
792 | extern int ftrace_graph_count; | |
793 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
29ad23b0 NK |
794 | extern int ftrace_graph_notrace_count; |
795 | extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
ea4e2bc4 SR |
796 | |
797 | static inline int ftrace_graph_addr(unsigned long addr) | |
798 | { | |
799 | int i; | |
800 | ||
9aa72b4b | 801 | if (!ftrace_graph_count) |
ea4e2bc4 SR |
802 | return 1; |
803 | ||
804 | for (i = 0; i < ftrace_graph_count; i++) { | |
e4a3f541 SR |
805 | if (addr == ftrace_graph_funcs[i]) { |
806 | /* | |
807 | * If no irqs are to be traced, but a set_graph_function | |
808 | * is set, and called by an interrupt handler, we still | |
809 | * want to trace it. | |
810 | */ | |
811 | if (in_irq()) | |
812 | trace_recursion_set(TRACE_IRQ_BIT); | |
813 | else | |
814 | trace_recursion_clear(TRACE_IRQ_BIT); | |
ea4e2bc4 | 815 | return 1; |
e4a3f541 | 816 | } |
ea4e2bc4 SR |
817 | } |
818 | ||
819 | return 0; | |
820 | } | |
29ad23b0 NK |
821 | |
822 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
823 | { | |
824 | int i; | |
825 | ||
826 | if (!ftrace_graph_notrace_count) | |
827 | return 0; | |
828 | ||
829 | for (i = 0; i < ftrace_graph_notrace_count; i++) { | |
830 | if (addr == ftrace_graph_notrace_funcs[i]) | |
831 | return 1; | |
832 | } | |
833 | ||
834 | return 0; | |
835 | } | |
15e6cb36 | 836 | #else |
6b253930 IM |
837 | static inline int ftrace_graph_addr(unsigned long addr) |
838 | { | |
839 | return 1; | |
ea4e2bc4 | 840 | } |
29ad23b0 NK |
841 | |
842 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
843 | { | |
844 | return 0; | |
845 | } | |
ea4e2bc4 | 846 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
ea4e2bc4 | 847 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 848 | static inline enum print_line_t |
d7a8d9e9 | 849 | print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
15e6cb36 FW |
850 | { |
851 | return TRACE_TYPE_UNHANDLED; | |
852 | } | |
ea4e2bc4 | 853 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 854 | |
756d17ee | 855 | extern struct list_head ftrace_pids; |
804a6851 | 856 | |
1155de47 | 857 | #ifdef CONFIG_FUNCTION_TRACER |
f1ed7c74 | 858 | extern bool ftrace_filter_param __initdata; |
345ddcc8 | 859 | static inline int ftrace_trace_task(struct trace_array *tr) |
804a6851 | 860 | { |
345ddcc8 | 861 | return !this_cpu_read(tr->trace_buffer.data->ftrace_ignore_pid); |
804a6851 | 862 | } |
e0a413f6 | 863 | extern int ftrace_is_dead(void); |
591dffda SRRH |
864 | int ftrace_create_function_files(struct trace_array *tr, |
865 | struct dentry *parent); | |
866 | void ftrace_destroy_function_files(struct trace_array *tr); | |
4104d326 SRRH |
867 | void ftrace_init_global_array_ops(struct trace_array *tr); |
868 | void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); | |
869 | void ftrace_reset_array_ops(struct trace_array *tr); | |
7eea4fce | 870 | int using_ftrace_ops_list_func(void); |
345ddcc8 | 871 | void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer); |
501c2375 SRRH |
872 | void ftrace_init_tracefs_toplevel(struct trace_array *tr, |
873 | struct dentry *d_tracer); | |
1155de47 | 874 | #else |
345ddcc8 | 875 | static inline int ftrace_trace_task(struct trace_array *tr) |
1155de47 PM |
876 | { |
877 | return 1; | |
878 | } | |
e0a413f6 | 879 | static inline int ftrace_is_dead(void) { return 0; } |
591dffda SRRH |
880 | static inline int |
881 | ftrace_create_function_files(struct trace_array *tr, | |
882 | struct dentry *parent) | |
883 | { | |
884 | return 0; | |
885 | } | |
886 | static inline void ftrace_destroy_function_files(struct trace_array *tr) { } | |
4104d326 SRRH |
887 | static inline __init void |
888 | ftrace_init_global_array_ops(struct trace_array *tr) { } | |
889 | static inline void ftrace_reset_array_ops(struct trace_array *tr) { } | |
345ddcc8 | 890 | static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { } |
501c2375 | 891 | static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { } |
4104d326 SRRH |
892 | /* ftace_func_t type is not defined, use macro instead of static inline */ |
893 | #define ftrace_init_array_ops(tr, func) do { } while (0) | |
591dffda SRRH |
894 | #endif /* CONFIG_FUNCTION_TRACER */ |
895 | ||
896 | #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) | |
897 | void ftrace_create_filter_files(struct ftrace_ops *ops, | |
898 | struct dentry *parent); | |
899 | void ftrace_destroy_filter_files(struct ftrace_ops *ops); | |
900 | #else | |
901 | /* | |
902 | * The ops parameter passed in is usually undefined. | |
903 | * This must be a macro. | |
904 | */ | |
905 | #define ftrace_create_filter_files(ops, parent) do { } while (0) | |
906 | #define ftrace_destroy_filter_files(ops) do { } while (0) | |
907 | #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ | |
804a6851 | 908 | |
c6650b2e | 909 | bool ftrace_event_is_function(struct trace_event_call *call); |
ced39002 | 910 | |
b63f39ea | 911 | /* |
912 | * struct trace_parser - servers for reading the user input separated by spaces | |
913 | * @cont: set if the input is not complete - no final space char was found | |
914 | * @buffer: holds the parsed user input | |
1537a363 | 915 | * @idx: user input length |
b63f39ea | 916 | * @size: buffer size |
917 | */ | |
918 | struct trace_parser { | |
919 | bool cont; | |
920 | char *buffer; | |
921 | unsigned idx; | |
922 | unsigned size; | |
923 | }; | |
924 | ||
925 | static inline bool trace_parser_loaded(struct trace_parser *parser) | |
926 | { | |
927 | return (parser->idx != 0); | |
928 | } | |
929 | ||
930 | static inline bool trace_parser_cont(struct trace_parser *parser) | |
931 | { | |
932 | return parser->cont; | |
933 | } | |
934 | ||
935 | static inline void trace_parser_clear(struct trace_parser *parser) | |
936 | { | |
937 | parser->cont = false; | |
938 | parser->idx = 0; | |
939 | } | |
940 | ||
941 | extern int trace_parser_get_init(struct trace_parser *parser, int size); | |
942 | extern void trace_parser_put(struct trace_parser *parser); | |
943 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
944 | size_t cnt, loff_t *ppos); | |
945 | ||
729358da SRRH |
946 | /* |
947 | * Only create function graph options if function graph is configured. | |
948 | */ | |
949 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
950 | # define FGRAPH_FLAGS \ | |
729358da | 951 | C(DISPLAY_GRAPH, "display-graph"), |
729358da SRRH |
952 | #else |
953 | # define FGRAPH_FLAGS | |
729358da SRRH |
954 | #endif |
955 | ||
4ee4301c SRRH |
956 | #ifdef CONFIG_BRANCH_TRACER |
957 | # define BRANCH_FLAGS \ | |
958 | C(BRANCH, "branch"), | |
959 | #else | |
960 | # define BRANCH_FLAGS | |
961 | #endif | |
962 | ||
8179e8a1 SRRH |
963 | #ifdef CONFIG_FUNCTION_TRACER |
964 | # define FUNCTION_FLAGS \ | |
965 | C(FUNCTION, "function-trace"), | |
966 | # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION | |
967 | #else | |
968 | # define FUNCTION_FLAGS | |
969 | # define FUNCTION_DEFAULT_FLAGS 0UL | |
970 | #endif | |
971 | ||
73dddbb5 SRRH |
972 | #ifdef CONFIG_STACKTRACE |
973 | # define STACK_FLAGS \ | |
974 | C(STACKTRACE, "stacktrace"), | |
975 | #else | |
976 | # define STACK_FLAGS | |
977 | #endif | |
978 | ||
4fcdae83 SR |
979 | /* |
980 | * trace_iterator_flags is an enumeration that defines bit | |
981 | * positions into trace_flags that controls the output. | |
982 | * | |
983 | * NOTE: These bits must match the trace_options array in | |
a3418a36 | 984 | * trace.c (this macro guarantees it). |
4fcdae83 | 985 | */ |
a3418a36 SRRH |
986 | #define TRACE_FLAGS \ |
987 | C(PRINT_PARENT, "print-parent"), \ | |
988 | C(SYM_OFFSET, "sym-offset"), \ | |
989 | C(SYM_ADDR, "sym-addr"), \ | |
990 | C(VERBOSE, "verbose"), \ | |
991 | C(RAW, "raw"), \ | |
992 | C(HEX, "hex"), \ | |
993 | C(BIN, "bin"), \ | |
994 | C(BLOCK, "block"), \ | |
a3418a36 | 995 | C(PRINTK, "trace_printk"), \ |
a3418a36 SRRH |
996 | C(ANNOTATE, "annotate"), \ |
997 | C(USERSTACKTRACE, "userstacktrace"), \ | |
998 | C(SYM_USEROBJ, "sym-userobj"), \ | |
999 | C(PRINTK_MSGONLY, "printk-msg-only"), \ | |
1000 | C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ | |
1001 | C(LATENCY_FMT, "latency-format"), \ | |
a3418a36 SRRH |
1002 | C(RECORD_CMD, "record-cmd"), \ |
1003 | C(OVERWRITE, "overwrite"), \ | |
1004 | C(STOP_ON_FREE, "disable_on_free"), \ | |
1005 | C(IRQ_INFO, "irq-info"), \ | |
1006 | C(MARKERS, "markers"), \ | |
c37775d5 | 1007 | C(EVENT_FORK, "event-fork"), \ |
8179e8a1 | 1008 | FUNCTION_FLAGS \ |
4ee4301c | 1009 | FGRAPH_FLAGS \ |
73dddbb5 | 1010 | STACK_FLAGS \ |
4ee4301c | 1011 | BRANCH_FLAGS |
ce3fed62 | 1012 | |
a3418a36 SRRH |
1013 | /* |
1014 | * By defining C, we can make TRACE_FLAGS a list of bit names | |
1015 | * that will define the bits for the flag masks. | |
1016 | */ | |
1017 | #undef C | |
1018 | #define C(a, b) TRACE_ITER_##a##_BIT | |
1019 | ||
b5e87c05 SRRH |
1020 | enum trace_iterator_bits { |
1021 | TRACE_FLAGS | |
1022 | /* Make sure we don't go more than we have bits for */ | |
1023 | TRACE_ITER_LAST_BIT | |
1024 | }; | |
a3418a36 SRRH |
1025 | |
1026 | /* | |
1027 | * By redefining C, we can make TRACE_FLAGS a list of masks that | |
1028 | * use the bits as defined above. | |
1029 | */ | |
1030 | #undef C | |
1031 | #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) | |
1032 | ||
1033 | enum trace_iterator_flags { TRACE_FLAGS }; | |
4e655519 | 1034 | |
15e6cb36 FW |
1035 | /* |
1036 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
1037 | * control the output of kernel symbols. | |
1038 | */ | |
1039 | #define TRACE_ITER_SYM_MASK \ | |
1040 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
1041 | ||
43a15386 FW |
1042 | extern struct tracer nop_trace; |
1043 | ||
2ed84eeb | 1044 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
1045 | extern int enable_branch_tracing(struct trace_array *tr); |
1046 | extern void disable_branch_tracing(void); | |
1047 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 1048 | { |
983f938a | 1049 | if (tr->trace_flags & TRACE_ITER_BRANCH) |
9f029e83 | 1050 | return enable_branch_tracing(tr); |
52f232cb SR |
1051 | return 0; |
1052 | } | |
9f029e83 | 1053 | static inline void trace_branch_disable(void) |
52f232cb SR |
1054 | { |
1055 | /* due to races, always disable */ | |
9f029e83 | 1056 | disable_branch_tracing(); |
52f232cb SR |
1057 | } |
1058 | #else | |
9f029e83 | 1059 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
1060 | { |
1061 | return 0; | |
1062 | } | |
9f029e83 | 1063 | static inline void trace_branch_disable(void) |
52f232cb SR |
1064 | { |
1065 | } | |
2ed84eeb | 1066 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 1067 | |
1852fcce SR |
1068 | /* set ring buffers to default size if not already done so */ |
1069 | int tracing_update_buffers(void); | |
1070 | ||
cf027f64 TZ |
1071 | struct ftrace_event_field { |
1072 | struct list_head link; | |
92edca07 SR |
1073 | const char *name; |
1074 | const char *type; | |
aa38e9fc | 1075 | int filter_type; |
cf027f64 TZ |
1076 | int offset; |
1077 | int size; | |
a118e4d1 | 1078 | int is_signed; |
cf027f64 TZ |
1079 | }; |
1080 | ||
30e673b2 | 1081 | struct event_filter { |
c9c53ca0 SR |
1082 | int n_preds; /* Number assigned */ |
1083 | int a_preds; /* allocated */ | |
74e9e58c | 1084 | struct filter_pred *preds; |
61e9dea2 | 1085 | struct filter_pred *root; |
8b372562 | 1086 | char *filter_string; |
30e673b2 TZ |
1087 | }; |
1088 | ||
cfb180f3 TZ |
1089 | struct event_subsystem { |
1090 | struct list_head list; | |
1091 | const char *name; | |
1f9963cb | 1092 | struct event_filter *filter; |
e9dbfae5 | 1093 | int ref_count; |
cfb180f3 TZ |
1094 | }; |
1095 | ||
7967b3e0 | 1096 | struct trace_subsystem_dir { |
ae63b31e SR |
1097 | struct list_head list; |
1098 | struct event_subsystem *subsystem; | |
1099 | struct trace_array *tr; | |
1100 | struct dentry *entry; | |
1101 | int ref_count; | |
1102 | int nr_events; | |
1103 | }; | |
1104 | ||
65da9a0a SRRH |
1105 | extern int call_filter_check_discard(struct trace_event_call *call, void *rec, |
1106 | struct ring_buffer *buffer, | |
1107 | struct ring_buffer_event *event); | |
fa66ddb8 | 1108 | |
fa66ddb8 SRRH |
1109 | void trace_buffer_unlock_commit_regs(struct trace_array *tr, |
1110 | struct ring_buffer *buffer, | |
1111 | struct ring_buffer_event *event, | |
1112 | unsigned long flags, int pc, | |
1113 | struct pt_regs *regs); | |
33fddff2 SRRH |
1114 | |
1115 | static inline void trace_buffer_unlock_commit(struct trace_array *tr, | |
1116 | struct ring_buffer *buffer, | |
1117 | struct ring_buffer_event *event, | |
1118 | unsigned long flags, int pc) | |
1119 | { | |
1120 | trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL); | |
1121 | } | |
1122 | ||
0fc1b09f SRRH |
1123 | DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); |
1124 | DECLARE_PER_CPU(int, trace_buffered_event_cnt); | |
1125 | void trace_buffered_event_disable(void); | |
1126 | void trace_buffered_event_enable(void); | |
1127 | ||
1128 | static inline void | |
1129 | __trace_event_discard_commit(struct ring_buffer *buffer, | |
1130 | struct ring_buffer_event *event) | |
1131 | { | |
1132 | if (this_cpu_read(trace_buffered_event) == event) { | |
1133 | /* Simply release the temp buffer */ | |
1134 | this_cpu_dec(trace_buffered_event_cnt); | |
1135 | return; | |
1136 | } | |
1137 | ring_buffer_discard_commit(buffer, event); | |
1138 | } | |
1139 | ||
dad56ee7 SRRH |
1140 | /* |
1141 | * Helper function for event_trigger_unlock_commit{_regs}(). | |
1142 | * If there are event triggers attached to this event that requires | |
1143 | * filtering against its fields, then they wil be called as the | |
1144 | * entry already holds the field information of the current event. | |
1145 | * | |
1146 | * It also checks if the event should be discarded or not. | |
1147 | * It is to be discarded if the event is soft disabled and the | |
1148 | * event was only recorded to process triggers, or if the event | |
1149 | * filter is active and this event did not match the filters. | |
1150 | * | |
1151 | * Returns true if the event is discarded, false otherwise. | |
1152 | */ | |
1153 | static inline bool | |
1154 | __event_trigger_test_discard(struct trace_event_file *file, | |
1155 | struct ring_buffer *buffer, | |
1156 | struct ring_buffer_event *event, | |
1157 | void *entry, | |
1158 | enum event_trigger_type *tt) | |
1159 | { | |
1160 | unsigned long eflags = file->flags; | |
1161 | ||
1162 | if (eflags & EVENT_FILE_FL_TRIGGER_COND) | |
1163 | *tt = event_triggers_call(file, entry); | |
1164 | ||
9cbb1506 SRRH |
1165 | if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || |
1166 | (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && | |
1167 | !filter_match_preds(file->filter, entry))) { | |
0fc1b09f | 1168 | __trace_event_discard_commit(buffer, event); |
9cbb1506 SRRH |
1169 | return true; |
1170 | } | |
dad56ee7 | 1171 | |
9cbb1506 | 1172 | return false; |
dad56ee7 SRRH |
1173 | } |
1174 | ||
1175 | /** | |
1176 | * event_trigger_unlock_commit - handle triggers and finish event commit | |
1177 | * @file: The file pointer assoctiated to the event | |
1178 | * @buffer: The ring buffer that the event is being written to | |
1179 | * @event: The event meta data in the ring buffer | |
1180 | * @entry: The event itself | |
1181 | * @irq_flags: The state of the interrupts at the start of the event | |
1182 | * @pc: The state of the preempt count at the start of the event. | |
1183 | * | |
1184 | * This is a helper function to handle triggers that require data | |
1185 | * from the event itself. It also tests the event against filters and | |
1186 | * if the event is soft disabled and should be discarded. | |
1187 | */ | |
1188 | static inline void | |
1189 | event_trigger_unlock_commit(struct trace_event_file *file, | |
1190 | struct ring_buffer *buffer, | |
1191 | struct ring_buffer_event *event, | |
1192 | void *entry, unsigned long irq_flags, int pc) | |
1193 | { | |
1194 | enum event_trigger_type tt = ETT_NONE; | |
1195 | ||
1196 | if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) | |
1197 | trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc); | |
1198 | ||
1199 | if (tt) | |
1200 | event_triggers_post_call(file, tt, entry); | |
1201 | } | |
1202 | ||
1203 | /** | |
1204 | * event_trigger_unlock_commit_regs - handle triggers and finish event commit | |
1205 | * @file: The file pointer assoctiated to the event | |
1206 | * @buffer: The ring buffer that the event is being written to | |
1207 | * @event: The event meta data in the ring buffer | |
1208 | * @entry: The event itself | |
1209 | * @irq_flags: The state of the interrupts at the start of the event | |
1210 | * @pc: The state of the preempt count at the start of the event. | |
1211 | * | |
1212 | * This is a helper function to handle triggers that require data | |
1213 | * from the event itself. It also tests the event against filters and | |
1214 | * if the event is soft disabled and should be discarded. | |
1215 | * | |
1216 | * Same as event_trigger_unlock_commit() but calls | |
1217 | * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). | |
1218 | */ | |
1219 | static inline void | |
1220 | event_trigger_unlock_commit_regs(struct trace_event_file *file, | |
1221 | struct ring_buffer *buffer, | |
1222 | struct ring_buffer_event *event, | |
1223 | void *entry, unsigned long irq_flags, int pc, | |
1224 | struct pt_regs *regs) | |
1225 | { | |
1226 | enum event_trigger_type tt = ETT_NONE; | |
1227 | ||
1228 | if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) | |
1229 | trace_buffer_unlock_commit_regs(file->tr, buffer, event, | |
1230 | irq_flags, pc, regs); | |
1231 | ||
1232 | if (tt) | |
1233 | event_triggers_post_call(file, tt, entry); | |
1234 | } | |
1235 | ||
61e9dea2 SR |
1236 | #define FILTER_PRED_INVALID ((unsigned short)-1) |
1237 | #define FILTER_PRED_IS_RIGHT (1 << 15) | |
43cd4145 | 1238 | #define FILTER_PRED_FOLD (1 << 15) |
61e9dea2 | 1239 | |
bf93f9ed SR |
1240 | /* |
1241 | * The max preds is the size of unsigned short with | |
1242 | * two flags at the MSBs. One bit is used for both the IS_RIGHT | |
1243 | * and FOLD flags. The other is reserved. | |
1244 | * | |
1245 | * 2^14 preds is way more than enough. | |
1246 | */ | |
1247 | #define MAX_FILTER_PRED 16384 | |
4a3d27e9 | 1248 | |
7ce7e424 | 1249 | struct filter_pred; |
1889d209 | 1250 | struct regex; |
7ce7e424 | 1251 | |
58d9a597 | 1252 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); |
7ce7e424 | 1253 | |
1889d209 FW |
1254 | typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
1255 | ||
3f6fe06d | 1256 | enum regex_type { |
b0f1a59a | 1257 | MATCH_FULL = 0, |
3f6fe06d FW |
1258 | MATCH_FRONT_ONLY, |
1259 | MATCH_MIDDLE_ONLY, | |
1260 | MATCH_END_ONLY, | |
60f1d5e3 | 1261 | MATCH_GLOB, |
3f6fe06d FW |
1262 | }; |
1263 | ||
1889d209 FW |
1264 | struct regex { |
1265 | char pattern[MAX_FILTER_STR_VAL]; | |
1266 | int len; | |
1267 | int field_len; | |
1268 | regex_match_func match; | |
1269 | }; | |
1270 | ||
7ce7e424 | 1271 | struct filter_pred { |
1889d209 FW |
1272 | filter_pred_fn_t fn; |
1273 | u64 val; | |
1274 | struct regex regex; | |
61aaef55 | 1275 | unsigned short *ops; |
1d0e78e3 | 1276 | struct ftrace_event_field *field; |
1889d209 FW |
1277 | int offset; |
1278 | int not; | |
1279 | int op; | |
61e9dea2 SR |
1280 | unsigned short index; |
1281 | unsigned short parent; | |
1282 | unsigned short left; | |
1283 | unsigned short right; | |
7ce7e424 TZ |
1284 | }; |
1285 | ||
4ef56902 TZ |
1286 | static inline bool is_string_field(struct ftrace_event_field *field) |
1287 | { | |
1288 | return field->filter_type == FILTER_DYN_STRING || | |
1289 | field->filter_type == FILTER_STATIC_STRING || | |
1290 | field->filter_type == FILTER_PTR_STRING; | |
1291 | } | |
1292 | ||
1293 | static inline bool is_function_field(struct ftrace_event_field *field) | |
1294 | { | |
1295 | return field->filter_type == FILTER_TRACE_FN; | |
1296 | } | |
1297 | ||
3f6fe06d FW |
1298 | extern enum regex_type |
1299 | filter_parse_regex(char *buff, int len, char **search, int *not); | |
7f1d2f82 | 1300 | extern void print_event_filter(struct trace_event_file *file, |
4bda2d51 | 1301 | struct trace_seq *s); |
7f1d2f82 | 1302 | extern int apply_event_filter(struct trace_event_file *file, |
8b372562 | 1303 | char *filter_string); |
7967b3e0 | 1304 | extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, |
8b372562 TZ |
1305 | char *filter_string); |
1306 | extern void print_subsystem_event_filter(struct event_subsystem *system, | |
ac1adc55 | 1307 | struct trace_seq *s); |
aa38e9fc | 1308 | extern int filter_assign_type(const char *type); |
2425bcb9 | 1309 | extern int create_event_filter(struct trace_event_call *call, |
bac5fb97 TZ |
1310 | char *filter_str, bool set_str, |
1311 | struct event_filter **filterp); | |
1312 | extern void free_event_filter(struct event_filter *filter); | |
7ce7e424 | 1313 | |
b3a8c6fd | 1314 | struct ftrace_event_field * |
2425bcb9 | 1315 | trace_find_event_field(struct trace_event_call *call, char *name); |
2e33af02 | 1316 | |
e870e9a1 | 1317 | extern void trace_event_enable_cmd_record(bool enable); |
277ba044 | 1318 | extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); |
0c8916c3 | 1319 | extern int event_trace_del_tracer(struct trace_array *tr); |
e870e9a1 | 1320 | |
7f1d2f82 SRRH |
1321 | extern struct trace_event_file *find_event_file(struct trace_array *tr, |
1322 | const char *system, | |
1323 | const char *event); | |
7862ad18 | 1324 | |
85f2b082 TZ |
1325 | static inline void *event_file_data(struct file *filp) |
1326 | { | |
1327 | return ACCESS_ONCE(file_inode(filp)->i_private); | |
1328 | } | |
1329 | ||
20c8928a | 1330 | extern struct mutex event_mutex; |
a59fd602 | 1331 | extern struct list_head ftrace_events; |
ac199db0 | 1332 | |
85f2b082 | 1333 | extern const struct file_operations event_trigger_fops; |
7ef224d1 TZ |
1334 | extern const struct file_operations event_hist_fops; |
1335 | ||
1336 | #ifdef CONFIG_HIST_TRIGGERS | |
1337 | extern int register_trigger_hist_cmd(void); | |
d0bad49b | 1338 | extern int register_trigger_hist_enable_disable_cmds(void); |
7ef224d1 TZ |
1339 | #else |
1340 | static inline int register_trigger_hist_cmd(void) { return 0; } | |
d0bad49b | 1341 | static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; } |
7ef224d1 | 1342 | #endif |
85f2b082 TZ |
1343 | |
1344 | extern int register_trigger_cmds(void); | |
1345 | extern void clear_event_triggers(struct trace_array *tr); | |
1346 | ||
1347 | struct event_trigger_data { | |
1348 | unsigned long count; | |
1349 | int ref; | |
1350 | struct event_trigger_ops *ops; | |
1351 | struct event_command *cmd_ops; | |
d8a30f20 | 1352 | struct event_filter __rcu *filter; |
85f2b082 TZ |
1353 | char *filter_str; |
1354 | void *private_data; | |
104f2810 | 1355 | bool paused; |
db1388b4 | 1356 | bool paused_tmp; |
85f2b082 | 1357 | struct list_head list; |
db1388b4 TZ |
1358 | char *name; |
1359 | struct list_head named_list; | |
1360 | struct event_trigger_data *named_data; | |
85f2b082 TZ |
1361 | }; |
1362 | ||
d0bad49b TZ |
1363 | /* Avoid typos */ |
1364 | #define ENABLE_EVENT_STR "enable_event" | |
1365 | #define DISABLE_EVENT_STR "disable_event" | |
1366 | #define ENABLE_HIST_STR "enable_hist" | |
1367 | #define DISABLE_HIST_STR "disable_hist" | |
1368 | ||
1369 | struct enable_trigger_data { | |
1370 | struct trace_event_file *file; | |
1371 | bool enable; | |
1372 | bool hist; | |
1373 | }; | |
1374 | ||
1375 | extern int event_enable_trigger_print(struct seq_file *m, | |
1376 | struct event_trigger_ops *ops, | |
1377 | struct event_trigger_data *data); | |
1378 | extern void event_enable_trigger_free(struct event_trigger_ops *ops, | |
1379 | struct event_trigger_data *data); | |
1380 | extern int event_enable_trigger_func(struct event_command *cmd_ops, | |
1381 | struct trace_event_file *file, | |
1382 | char *glob, char *cmd, char *param); | |
1383 | extern int event_enable_register_trigger(char *glob, | |
1384 | struct event_trigger_ops *ops, | |
1385 | struct event_trigger_data *data, | |
1386 | struct trace_event_file *file); | |
1387 | extern void event_enable_unregister_trigger(char *glob, | |
1388 | struct event_trigger_ops *ops, | |
1389 | struct event_trigger_data *test, | |
1390 | struct trace_event_file *file); | |
ab4bf008 TZ |
1391 | extern void trigger_data_free(struct event_trigger_data *data); |
1392 | extern int event_trigger_init(struct event_trigger_ops *ops, | |
1393 | struct event_trigger_data *data); | |
1394 | extern int trace_event_trigger_enable_disable(struct trace_event_file *file, | |
1395 | int trigger_enable); | |
1396 | extern void update_cond_flag(struct trace_event_file *file); | |
1397 | extern void unregister_trigger(char *glob, struct event_trigger_ops *ops, | |
1398 | struct event_trigger_data *test, | |
1399 | struct trace_event_file *file); | |
1400 | extern int set_trigger_filter(char *filter_str, | |
1401 | struct event_trigger_data *trigger_data, | |
1402 | struct trace_event_file *file); | |
db1388b4 TZ |
1403 | extern struct event_trigger_data *find_named_trigger(const char *name); |
1404 | extern bool is_named_trigger(struct event_trigger_data *test); | |
1405 | extern int save_named_trigger(const char *name, | |
1406 | struct event_trigger_data *data); | |
1407 | extern void del_named_trigger(struct event_trigger_data *data); | |
1408 | extern void pause_named_trigger(struct event_trigger_data *data); | |
1409 | extern void unpause_named_trigger(struct event_trigger_data *data); | |
1410 | extern void set_named_trigger_data(struct event_trigger_data *data, | |
1411 | struct event_trigger_data *named_data); | |
ab4bf008 | 1412 | extern int register_event_command(struct event_command *cmd); |
d0bad49b TZ |
1413 | extern int unregister_event_command(struct event_command *cmd); |
1414 | extern int register_trigger_hist_enable_disable_cmds(void); | |
ab4bf008 | 1415 | |
85f2b082 TZ |
1416 | /** |
1417 | * struct event_trigger_ops - callbacks for trace event triggers | |
1418 | * | |
1419 | * The methods in this structure provide per-event trigger hooks for | |
1420 | * various trigger operations. | |
1421 | * | |
1422 | * All the methods below, except for @init() and @free(), must be | |
1423 | * implemented. | |
1424 | * | |
1425 | * @func: The trigger 'probe' function called when the triggering | |
1426 | * event occurs. The data passed into this callback is the data | |
1427 | * that was supplied to the event_command @reg() function that | |
c4a59230 TZ |
1428 | * registered the trigger (see struct event_command) along with |
1429 | * the trace record, rec. | |
85f2b082 TZ |
1430 | * |
1431 | * @init: An optional initialization function called for the trigger | |
1432 | * when the trigger is registered (via the event_command reg() | |
1433 | * function). This can be used to perform per-trigger | |
1434 | * initialization such as incrementing a per-trigger reference | |
1435 | * count, for instance. This is usually implemented by the | |
1436 | * generic utility function @event_trigger_init() (see | |
1437 | * trace_event_triggers.c). | |
1438 | * | |
1439 | * @free: An optional de-initialization function called for the | |
1440 | * trigger when the trigger is unregistered (via the | |
1441 | * event_command @reg() function). This can be used to perform | |
1442 | * per-trigger de-initialization such as decrementing a | |
1443 | * per-trigger reference count and freeing corresponding trigger | |
1444 | * data, for instance. This is usually implemented by the | |
1445 | * generic utility function @event_trigger_free() (see | |
1446 | * trace_event_triggers.c). | |
1447 | * | |
1448 | * @print: The callback function invoked to have the trigger print | |
1449 | * itself. This is usually implemented by a wrapper function | |
1450 | * that calls the generic utility function @event_trigger_print() | |
1451 | * (see trace_event_triggers.c). | |
1452 | */ | |
1453 | struct event_trigger_ops { | |
c4a59230 TZ |
1454 | void (*func)(struct event_trigger_data *data, |
1455 | void *rec); | |
85f2b082 TZ |
1456 | int (*init)(struct event_trigger_ops *ops, |
1457 | struct event_trigger_data *data); | |
1458 | void (*free)(struct event_trigger_ops *ops, | |
1459 | struct event_trigger_data *data); | |
1460 | int (*print)(struct seq_file *m, | |
1461 | struct event_trigger_ops *ops, | |
1462 | struct event_trigger_data *data); | |
1463 | }; | |
1464 | ||
1465 | /** | |
1466 | * struct event_command - callbacks and data members for event commands | |
1467 | * | |
1468 | * Event commands are invoked by users by writing the command name | |
1469 | * into the 'trigger' file associated with a trace event. The | |
1470 | * parameters associated with a specific invocation of an event | |
1471 | * command are used to create an event trigger instance, which is | |
1472 | * added to the list of trigger instances associated with that trace | |
1473 | * event. When the event is hit, the set of triggers associated with | |
1474 | * that event is invoked. | |
1475 | * | |
1476 | * The data members in this structure provide per-event command data | |
1477 | * for various event commands. | |
1478 | * | |
1479 | * All the data members below, except for @post_trigger, must be set | |
1480 | * for each event command. | |
1481 | * | |
1482 | * @name: The unique name that identifies the event command. This is | |
1483 | * the name used when setting triggers via trigger files. | |
1484 | * | |
1485 | * @trigger_type: A unique id that identifies the event command | |
1486 | * 'type'. This value has two purposes, the first to ensure that | |
1487 | * only one trigger of the same type can be set at a given time | |
1488 | * for a particular event e.g. it doesn't make sense to have both | |
1489 | * a traceon and traceoff trigger attached to a single event at | |
1490 | * the same time, so traceon and traceoff have the same type | |
1491 | * though they have different names. The @trigger_type value is | |
1492 | * also used as a bit value for deferring the actual trigger | |
1493 | * action until after the current event is finished. Some | |
1494 | * commands need to do this if they themselves log to the trace | |
1495 | * buffer (see the @post_trigger() member below). @trigger_type | |
1496 | * values are defined by adding new values to the trigger_type | |
af658dca | 1497 | * enum in include/linux/trace_events.h. |
85f2b082 | 1498 | * |
353206f5 | 1499 | * @flags: See the enum event_command_flags below. |
a5863dae | 1500 | * |
a88e1cfb TZ |
1501 | * All the methods below, except for @set_filter() and @unreg_all(), |
1502 | * must be implemented. | |
85f2b082 TZ |
1503 | * |
1504 | * @func: The callback function responsible for parsing and | |
1505 | * registering the trigger written to the 'trigger' file by the | |
1506 | * user. It allocates the trigger instance and registers it with | |
1507 | * the appropriate trace event. It makes use of the other | |
1508 | * event_command callback functions to orchestrate this, and is | |
1509 | * usually implemented by the generic utility function | |
1510 | * @event_trigger_callback() (see trace_event_triggers.c). | |
1511 | * | |
1512 | * @reg: Adds the trigger to the list of triggers associated with the | |
1513 | * event, and enables the event trigger itself, after | |
1514 | * initializing it (via the event_trigger_ops @init() function). | |
1515 | * This is also where commands can use the @trigger_type value to | |
1516 | * make the decision as to whether or not multiple instances of | |
1517 | * the trigger should be allowed. This is usually implemented by | |
1518 | * the generic utility function @register_trigger() (see | |
1519 | * trace_event_triggers.c). | |
1520 | * | |
1521 | * @unreg: Removes the trigger from the list of triggers associated | |
1522 | * with the event, and disables the event trigger itself, after | |
1523 | * initializing it (via the event_trigger_ops @free() function). | |
1524 | * This is usually implemented by the generic utility function | |
1525 | * @unregister_trigger() (see trace_event_triggers.c). | |
1526 | * | |
a88e1cfb TZ |
1527 | * @unreg_all: An optional function called to remove all the triggers |
1528 | * from the list of triggers associated with the event. Called | |
1529 | * when a trigger file is opened in truncate mode. | |
1530 | * | |
85f2b082 TZ |
1531 | * @set_filter: An optional function called to parse and set a filter |
1532 | * for the trigger. If no @set_filter() method is set for the | |
1533 | * event command, filters set by the user for the command will be | |
1534 | * ignored. This is usually implemented by the generic utility | |
1535 | * function @set_trigger_filter() (see trace_event_triggers.c). | |
1536 | * | |
1537 | * @get_trigger_ops: The callback function invoked to retrieve the | |
1538 | * event_trigger_ops implementation associated with the command. | |
1539 | */ | |
1540 | struct event_command { | |
1541 | struct list_head list; | |
1542 | char *name; | |
1543 | enum event_trigger_type trigger_type; | |
353206f5 | 1544 | int flags; |
85f2b082 | 1545 | int (*func)(struct event_command *cmd_ops, |
7f1d2f82 | 1546 | struct trace_event_file *file, |
85f2b082 TZ |
1547 | char *glob, char *cmd, char *params); |
1548 | int (*reg)(char *glob, | |
1549 | struct event_trigger_ops *ops, | |
1550 | struct event_trigger_data *data, | |
7f1d2f82 | 1551 | struct trace_event_file *file); |
85f2b082 TZ |
1552 | void (*unreg)(char *glob, |
1553 | struct event_trigger_ops *ops, | |
1554 | struct event_trigger_data *data, | |
7f1d2f82 | 1555 | struct trace_event_file *file); |
a88e1cfb | 1556 | void (*unreg_all)(struct trace_event_file *file); |
85f2b082 TZ |
1557 | int (*set_filter)(char *filter_str, |
1558 | struct event_trigger_data *data, | |
7f1d2f82 | 1559 | struct trace_event_file *file); |
85f2b082 TZ |
1560 | struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); |
1561 | }; | |
1562 | ||
353206f5 SRRH |
1563 | /** |
1564 | * enum event_command_flags - flags for struct event_command | |
1565 | * | |
1566 | * @POST_TRIGGER: A flag that says whether or not this command needs | |
1567 | * to have its action delayed until after the current event has | |
1568 | * been closed. Some triggers need to avoid being invoked while | |
1569 | * an event is currently in the process of being logged, since | |
1570 | * the trigger may itself log data into the trace buffer. Thus | |
1571 | * we make sure the current event is committed before invoking | |
1572 | * those triggers. To do that, the trigger invocation is split | |
1573 | * in two - the first part checks the filter using the current | |
1574 | * trace record; if a command has the @post_trigger flag set, it | |
1575 | * sets a bit for itself in the return value, otherwise it | |
1576 | * directly invokes the trigger. Once all commands have been | |
1577 | * either invoked or set their return flag, the current record is | |
1578 | * either committed or discarded. At that point, if any commands | |
1579 | * have deferred their triggers, those commands are finally | |
1580 | * invoked following the close of the current event. In other | |
1581 | * words, if the event_trigger_ops @func() probe implementation | |
1582 | * itself logs to the trace buffer, this flag should be set, | |
1583 | * otherwise it can be left unspecified. | |
1584 | * | |
1585 | * @NEEDS_REC: A flag that says whether or not this command needs | |
1586 | * access to the trace record in order to perform its function, | |
1587 | * regardless of whether or not it has a filter associated with | |
1588 | * it (filters make a trigger require access to the trace record | |
1589 | * but are not always present). | |
1590 | */ | |
1591 | enum event_command_flags { | |
1592 | EVENT_CMD_FL_POST_TRIGGER = 1, | |
1593 | EVENT_CMD_FL_NEEDS_REC = 2, | |
1594 | }; | |
1595 | ||
1596 | static inline bool event_command_post_trigger(struct event_command *cmd_ops) | |
1597 | { | |
1598 | return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER; | |
1599 | } | |
1600 | ||
1601 | static inline bool event_command_needs_rec(struct event_command *cmd_ops) | |
1602 | { | |
1603 | return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC; | |
1604 | } | |
1605 | ||
7f1d2f82 | 1606 | extern int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 | 1607 | int enable, int soft_disable); |
93e31ffb | 1608 | extern int tracing_alloc_snapshot(void); |
85f2b082 | 1609 | |
e9fb2b6d SR |
1610 | extern const char *__start___trace_bprintk_fmt[]; |
1611 | extern const char *__stop___trace_bprintk_fmt[]; | |
1612 | ||
102c9323 SRRH |
1613 | extern const char *__start___tracepoint_str[]; |
1614 | extern const char *__stop___tracepoint_str[]; | |
1615 | ||
b9f9108c | 1616 | void trace_printk_control(bool enabled); |
07d777fe | 1617 | void trace_printk_init_buffers(void); |
81698831 | 1618 | void trace_printk_start_comm(void); |
613f04a0 | 1619 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); |
2b6080f2 | 1620 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); |
07d777fe | 1621 | |
ca268da6 SRRH |
1622 | /* |
1623 | * Normal trace_printk() and friends allocates special buffers | |
1624 | * to do the manipulation, as well as saves the print formats | |
1625 | * into sections to display. But the trace infrastructure wants | |
1626 | * to use these without the added overhead at the price of being | |
1627 | * a bit slower (used mainly for warnings, where we don't care | |
1628 | * about performance). The internal_trace_puts() is for such | |
1629 | * a purpose. | |
1630 | */ | |
1631 | #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) | |
1632 | ||
4e5292ea | 1633 | #undef FTRACE_ENTRY |
02aa3162 | 1634 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ |
2425bcb9 | 1635 | extern struct trace_event_call \ |
52f5684c | 1636 | __aligned(4) event_##call; |
4e5292ea | 1637 | #undef FTRACE_ENTRY_DUP |
02aa3162 JO |
1638 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ |
1639 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
1640 | filter) | |
a4a551b8 NK |
1641 | #undef FTRACE_ENTRY_PACKED |
1642 | #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print, filter) \ | |
1643 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
1644 | filter) | |
1645 | ||
4e5292ea | 1646 | #include "trace_entries.h" |
e1112b4d | 1647 | |
6e48b550 | 1648 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) |
2425bcb9 | 1649 | int perf_ftrace_event_register(struct trace_event_call *call, |
ced39002 JO |
1650 | enum trace_reg type, void *data); |
1651 | #else | |
1652 | #define perf_ftrace_event_register NULL | |
6e48b550 | 1653 | #endif |
ced39002 | 1654 | |
5f893b26 SRRH |
1655 | #ifdef CONFIG_FTRACE_SYSCALLS |
1656 | void init_ftrace_syscalls(void); | |
dbfeaa7a | 1657 | const char *get_syscall_name(int syscall); |
5f893b26 SRRH |
1658 | #else |
1659 | static inline void init_ftrace_syscalls(void) { } | |
dbfeaa7a TZ |
1660 | static inline const char *get_syscall_name(int syscall) |
1661 | { | |
1662 | return NULL; | |
1663 | } | |
5f893b26 SRRH |
1664 | #endif |
1665 | ||
1666 | #ifdef CONFIG_EVENT_TRACING | |
1667 | void trace_event_init(void); | |
0c564a53 | 1668 | void trace_event_enum_update(struct trace_enum_map **map, int len); |
5f893b26 SRRH |
1669 | #else |
1670 | static inline void __init trace_event_init(void) { } | |
cc9e4bde | 1671 | static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { } |
5f893b26 SRRH |
1672 | #endif |
1673 | ||
0daa2302 | 1674 | extern struct trace_iterator *tracepoint_print_iter; |
5f893b26 | 1675 | |
bc0c38d1 | 1676 | #endif /* _LINUX_KERNEL_TRACE_H */ |