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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> |
9504504c | 18 | |
12ab74ee SR |
19 | #ifdef CONFIG_FTRACE_SYSCALLS |
20 | #include <asm/unistd.h> /* For NR_SYSCALLS */ | |
21 | #include <asm/syscall.h> /* some archs define it here */ | |
22 | #endif | |
23 | ||
72829bc3 TG |
24 | enum trace_type { |
25 | __TRACE_FIRST_TYPE = 0, | |
26 | ||
27 | TRACE_FN, | |
28 | TRACE_CTX, | |
29 | TRACE_WAKE, | |
30 | TRACE_STACK, | |
dd0e545f | 31 | TRACE_PRINT, |
48ead020 | 32 | TRACE_BPRINT, |
bd8ac686 PP |
33 | TRACE_MMIO_RW, |
34 | TRACE_MMIO_MAP, | |
9f029e83 | 35 | TRACE_BRANCH, |
287b6e68 FW |
36 | TRACE_GRAPH_RET, |
37 | TRACE_GRAPH_ENT, | |
02b67518 | 38 | TRACE_USER_STACK, |
c71a8961 | 39 | TRACE_BLK, |
09ae7234 | 40 | TRACE_BPUTS, |
72829bc3 | 41 | |
f0868d1e | 42 | __TRACE_LAST_TYPE, |
72829bc3 TG |
43 | }; |
44 | ||
bc0c38d1 | 45 | |
0a1c49db SR |
46 | #undef __field |
47 | #define __field(type, item) type item; | |
86387f7e | 48 | |
d7315094 SR |
49 | #undef __field_struct |
50 | #define __field_struct(type, item) __field(type, item) | |
86387f7e | 51 | |
d7315094 SR |
52 | #undef __field_desc |
53 | #define __field_desc(type, container, item) | |
02b67518 | 54 | |
0a1c49db SR |
55 | #undef __array |
56 | #define __array(type, item, size) type item[size]; | |
1427cdf0 | 57 | |
d7315094 SR |
58 | #undef __array_desc |
59 | #define __array_desc(type, container, item, size) | |
777e208d | 60 | |
0a1c49db SR |
61 | #undef __dynamic_array |
62 | #define __dynamic_array(type, item) type item[]; | |
777e208d | 63 | |
0a1c49db SR |
64 | #undef F_STRUCT |
65 | #define F_STRUCT(args...) args | |
74239072 | 66 | |
0a1c49db | 67 | #undef FTRACE_ENTRY |
02aa3162 JO |
68 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \ |
69 | struct struct_name { \ | |
70 | struct trace_entry ent; \ | |
71 | tstruct \ | |
0a1c49db | 72 | } |
777e208d | 73 | |
0a1c49db SR |
74 | #undef TP_ARGS |
75 | #define TP_ARGS(args...) args | |
52f232cb | 76 | |
0a1c49db | 77 | #undef FTRACE_ENTRY_DUP |
02aa3162 | 78 | #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter) |
1e9b51c2 | 79 | |
e59a0bff | 80 | #undef FTRACE_ENTRY_REG |
02aa3162 JO |
81 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \ |
82 | filter, regfn) \ | |
83 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
84 | filter) | |
e59a0bff | 85 | |
0a1c49db | 86 | #include "trace_entries.h" |
36994e58 | 87 | |
0a1c49db SR |
88 | /* |
89 | * syscalls are special, and need special handling, this is why | |
90 | * they are not included in trace_entries.h | |
91 | */ | |
bed1ffca FW |
92 | struct syscall_trace_enter { |
93 | struct trace_entry ent; | |
94 | int nr; | |
95 | unsigned long args[]; | |
96 | }; | |
97 | ||
98 | struct syscall_trace_exit { | |
99 | struct trace_entry ent; | |
100 | int nr; | |
99df5a6a | 101 | long ret; |
bed1ffca FW |
102 | }; |
103 | ||
93ccae7a | 104 | struct kprobe_trace_entry_head { |
413d37d1 MH |
105 | struct trace_entry ent; |
106 | unsigned long ip; | |
413d37d1 MH |
107 | }; |
108 | ||
93ccae7a | 109 | struct kretprobe_trace_entry_head { |
413d37d1 MH |
110 | struct trace_entry ent; |
111 | unsigned long func; | |
112 | unsigned long ret_ip; | |
413d37d1 MH |
113 | }; |
114 | ||
fc5e27ae PP |
115 | /* |
116 | * trace_flag_type is an enumeration that holds different | |
117 | * states when a trace occurs. These are: | |
9244489a | 118 | * IRQS_OFF - interrupts were disabled |
9de36825 | 119 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags |
bd9cfca9 | 120 | * NEED_RESCHED - reschedule is requested |
9244489a SR |
121 | * HARDIRQ - inside an interrupt handler |
122 | * SOFTIRQ - inside a softirq handler | |
fc5e27ae PP |
123 | */ |
124 | enum trace_flag_type { | |
125 | TRACE_FLAG_IRQS_OFF = 0x01, | |
9244489a SR |
126 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02, |
127 | TRACE_FLAG_NEED_RESCHED = 0x04, | |
128 | TRACE_FLAG_HARDIRQ = 0x08, | |
129 | TRACE_FLAG_SOFTIRQ = 0x10, | |
e5137b50 | 130 | TRACE_FLAG_PREEMPT_RESCHED = 0x20, |
fc5e27ae PP |
131 | }; |
132 | ||
5bf9a1ee | 133 | #define TRACE_BUF_SIZE 1024 |
bc0c38d1 | 134 | |
2b6080f2 SR |
135 | struct trace_array; |
136 | ||
bc0c38d1 SR |
137 | /* |
138 | * The CPU trace array - it consists of thousands of trace entries | |
139 | * plus some other descriptor data: (for example which task started | |
140 | * the trace, etc.) | |
141 | */ | |
142 | struct trace_array_cpu { | |
bc0c38d1 | 143 | atomic_t disabled; |
2cadf913 | 144 | void *buffer_page; /* ring buffer spare */ |
4e3c3333 | 145 | |
438ced17 | 146 | unsigned long entries; |
bc0c38d1 SR |
147 | unsigned long saved_latency; |
148 | unsigned long critical_start; | |
149 | unsigned long critical_end; | |
150 | unsigned long critical_sequence; | |
151 | unsigned long nice; | |
152 | unsigned long policy; | |
153 | unsigned long rt_priority; | |
2f26ebd5 | 154 | unsigned long skipped_entries; |
bc0c38d1 SR |
155 | cycle_t preempt_timestamp; |
156 | pid_t pid; | |
d20b92ab | 157 | kuid_t uid; |
bc0c38d1 | 158 | char comm[TASK_COMM_LEN]; |
3fdaf80f SRRH |
159 | |
160 | bool ignore_pid; | |
bc0c38d1 SR |
161 | }; |
162 | ||
2b6080f2 | 163 | struct tracer; |
37aea98b | 164 | struct trace_option_dentry; |
2b6080f2 | 165 | |
12883efb SRRH |
166 | struct trace_buffer { |
167 | struct trace_array *tr; | |
168 | struct ring_buffer *buffer; | |
169 | struct trace_array_cpu __percpu *data; | |
170 | cycle_t time_start; | |
171 | int cpu; | |
172 | }; | |
173 | ||
9a38a885 SRRH |
174 | #define TRACE_FLAGS_MAX_SIZE 32 |
175 | ||
37aea98b SRRH |
176 | struct trace_options { |
177 | struct tracer *tracer; | |
178 | struct trace_option_dentry *topts; | |
179 | }; | |
180 | ||
49090107 SRRH |
181 | struct trace_pid_list { |
182 | unsigned int nr_pids; | |
183 | int order; | |
184 | pid_t *pids; | |
185 | }; | |
186 | ||
bc0c38d1 SR |
187 | /* |
188 | * The trace array - an array of per-CPU trace arrays. This is the | |
189 | * highest level data structure that individual tracers deal with. | |
190 | * They have on/off state as well: | |
191 | */ | |
192 | struct trace_array { | |
ae63b31e | 193 | struct list_head list; |
277ba044 | 194 | char *name; |
12883efb SRRH |
195 | struct trace_buffer trace_buffer; |
196 | #ifdef CONFIG_TRACER_MAX_TRACE | |
197 | /* | |
198 | * The max_buffer is used to snapshot the trace when a maximum | |
199 | * latency is reached, or when the user initiates a snapshot. | |
200 | * Some tracers will use this to store a maximum trace while | |
201 | * it continues examining live traces. | |
202 | * | |
203 | * The buffers for the max_buffer are set up the same as the trace_buffer | |
204 | * When a snapshot is taken, the buffer of the max_buffer is swapped | |
205 | * with the buffer of the trace_buffer and the buffers are reset for | |
206 | * the trace_buffer so the tracing can continue. | |
207 | */ | |
208 | struct trace_buffer max_buffer; | |
45ad21ca | 209 | bool allocated_snapshot; |
6d9b3fa5 | 210 | unsigned long max_latency; |
12883efb | 211 | #endif |
49090107 | 212 | struct trace_pid_list __rcu *filtered_pids; |
0b9b12c1 SRRH |
213 | /* |
214 | * max_lock is used to protect the swapping of buffers | |
215 | * when taking a max snapshot. The buffers themselves are | |
216 | * protected by per_cpu spinlocks. But the action of the swap | |
217 | * needs its own lock. | |
218 | * | |
219 | * This is defined as a arch_spinlock_t in order to help | |
220 | * with performance when lockdep debugging is enabled. | |
221 | * | |
222 | * It is also used in other places outside the update_max_tr | |
223 | * so it needs to be defined outside of the | |
224 | * CONFIG_TRACER_MAX_TRACE. | |
225 | */ | |
226 | arch_spinlock_t max_lock; | |
499e5470 | 227 | int buffer_disabled; |
12ab74ee SR |
228 | #ifdef CONFIG_FTRACE_SYSCALLS |
229 | int sys_refcount_enter; | |
230 | int sys_refcount_exit; | |
7f1d2f82 SRRH |
231 | struct trace_event_file __rcu *enter_syscall_files[NR_syscalls]; |
232 | struct trace_event_file __rcu *exit_syscall_files[NR_syscalls]; | |
12ab74ee | 233 | #endif |
2b6080f2 SR |
234 | int stop_count; |
235 | int clock_id; | |
37aea98b | 236 | int nr_topts; |
2b6080f2 | 237 | struct tracer *current_trace; |
983f938a | 238 | unsigned int trace_flags; |
9a38a885 | 239 | unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE]; |
ae63b31e | 240 | unsigned int flags; |
2b6080f2 | 241 | raw_spinlock_t start_lock; |
ae63b31e | 242 | struct dentry *dir; |
2b6080f2 SR |
243 | struct dentry *options; |
244 | struct dentry *percpu_dir; | |
ae63b31e | 245 | struct dentry *event_dir; |
37aea98b | 246 | struct trace_options *topts; |
ae63b31e SR |
247 | struct list_head systems; |
248 | struct list_head events; | |
ccfe9e42 | 249 | cpumask_var_t tracing_cpumask; /* only trace on set CPUs */ |
a695cb58 | 250 | int ref; |
f20a5806 SRRH |
251 | #ifdef CONFIG_FUNCTION_TRACER |
252 | struct ftrace_ops *ops; | |
253 | /* function tracing enabled */ | |
254 | int function_enabled; | |
255 | #endif | |
bc0c38d1 SR |
256 | }; |
257 | ||
ae63b31e SR |
258 | enum { |
259 | TRACE_ARRAY_FL_GLOBAL = (1 << 0) | |
260 | }; | |
261 | ||
262 | extern struct list_head ftrace_trace_arrays; | |
263 | ||
a8227415 AL |
264 | extern struct mutex trace_types_lock; |
265 | ||
8e2e2fa4 SRRH |
266 | extern int trace_array_get(struct trace_array *tr); |
267 | extern void trace_array_put(struct trace_array *tr); | |
268 | ||
ae63b31e SR |
269 | /* |
270 | * The global tracer (top) should be the first trace array added, | |
271 | * but we check the flag anyway. | |
272 | */ | |
273 | static inline struct trace_array *top_trace_array(void) | |
274 | { | |
275 | struct trace_array *tr; | |
276 | ||
da9c3413 | 277 | if (list_empty(&ftrace_trace_arrays)) |
dc81e5e3 YY |
278 | return NULL; |
279 | ||
ae63b31e SR |
280 | tr = list_entry(ftrace_trace_arrays.prev, |
281 | typeof(*tr), list); | |
282 | WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL)); | |
283 | return tr; | |
284 | } | |
285 | ||
7104f300 SR |
286 | #define FTRACE_CMP_TYPE(var, type) \ |
287 | __builtin_types_compatible_p(typeof(var), type *) | |
288 | ||
289 | #undef IF_ASSIGN | |
290 | #define IF_ASSIGN(var, entry, etype, id) \ | |
291 | if (FTRACE_CMP_TYPE(var, etype)) { \ | |
292 | var = (typeof(var))(entry); \ | |
293 | WARN_ON(id && (entry)->type != id); \ | |
294 | break; \ | |
295 | } | |
296 | ||
297 | /* Will cause compile errors if type is not found. */ | |
298 | extern void __ftrace_bad_type(void); | |
299 | ||
300 | /* | |
301 | * The trace_assign_type is a verifier that the entry type is | |
302 | * the same as the type being assigned. To add new types simply | |
303 | * add a line with the following format: | |
304 | * | |
305 | * IF_ASSIGN(var, ent, type, id); | |
306 | * | |
307 | * Where "type" is the trace type that includes the trace_entry | |
308 | * as the "ent" item. And "id" is the trace identifier that is | |
309 | * used in the trace_type enum. | |
310 | * | |
311 | * If the type can have more than one id, then use zero. | |
312 | */ | |
313 | #define trace_assign_type(var, ent) \ | |
314 | do { \ | |
315 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \ | |
316 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \ | |
7104f300 | 317 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \ |
02b67518 | 318 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\ |
7104f300 | 319 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \ |
48ead020 | 320 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \ |
09ae7234 | 321 | IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \ |
7104f300 SR |
322 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \ |
323 | TRACE_MMIO_RW); \ | |
324 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \ | |
325 | TRACE_MMIO_MAP); \ | |
9f029e83 | 326 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \ |
287b6e68 FW |
327 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \ |
328 | TRACE_GRAPH_ENT); \ | |
329 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \ | |
330 | TRACE_GRAPH_RET); \ | |
7104f300 SR |
331 | __ftrace_bad_type(); \ |
332 | } while (0) | |
2c4f035f | 333 | |
adf9f195 FW |
334 | /* |
335 | * An option specific to a tracer. This is a boolean value. | |
336 | * The bit is the bit index that sets its value on the | |
337 | * flags value in struct tracer_flags. | |
338 | */ | |
339 | struct tracer_opt { | |
9de36825 IM |
340 | const char *name; /* Will appear on the trace_options file */ |
341 | u32 bit; /* Mask assigned in val field in tracer_flags */ | |
adf9f195 FW |
342 | }; |
343 | ||
344 | /* | |
345 | * The set of specific options for a tracer. Your tracer | |
346 | * have to set the initial value of the flags val. | |
347 | */ | |
348 | struct tracer_flags { | |
349 | u32 val; | |
9de36825 | 350 | struct tracer_opt *opts; |
adf9f195 FW |
351 | }; |
352 | ||
353 | /* Makes more easy to define a tracer opt */ | |
354 | #define TRACER_OPT(s, b) .name = #s, .bit = b | |
355 | ||
034939b6 | 356 | |
41d9c0be SRRH |
357 | struct trace_option_dentry { |
358 | struct tracer_opt *opt; | |
359 | struct tracer_flags *flags; | |
360 | struct trace_array *tr; | |
361 | struct dentry *entry; | |
362 | }; | |
363 | ||
6eaaa5d5 | 364 | /** |
8434dc93 | 365 | * struct tracer - a specific tracer and its callbacks to interact with tracefs |
6eaaa5d5 FW |
366 | * @name: the name chosen to select it on the available_tracers file |
367 | * @init: called when one switches to this tracer (echo name > current_tracer) | |
368 | * @reset: called when one switches to another tracer | |
369 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled) | |
370 | * @stop: called when tracing is paused (echo 0 > tracing_enabled) | |
6508fa76 | 371 | * @update_thresh: called when tracing_thresh is updated |
6eaaa5d5 FW |
372 | * @open: called when the trace file is opened |
373 | * @pipe_open: called when the trace_pipe file is opened | |
6eaaa5d5 | 374 | * @close: called when the trace file is released |
c521efd1 | 375 | * @pipe_close: called when the trace_pipe file is released |
6eaaa5d5 FW |
376 | * @read: override the default read callback on trace_pipe |
377 | * @splice_read: override the default splice_read callback on trace_pipe | |
378 | * @selftest: selftest to run on boot (see trace_selftest.c) | |
379 | * @print_headers: override the first lines that describe your columns | |
380 | * @print_line: callback that prints a trace | |
381 | * @set_flag: signals one of your private flags changed (trace_options file) | |
382 | * @flags: your private flags | |
bc0c38d1 SR |
383 | */ |
384 | struct tracer { | |
385 | const char *name; | |
1c80025a | 386 | int (*init)(struct trace_array *tr); |
bc0c38d1 | 387 | void (*reset)(struct trace_array *tr); |
9036990d SR |
388 | void (*start)(struct trace_array *tr); |
389 | void (*stop)(struct trace_array *tr); | |
6508fa76 | 390 | int (*update_thresh)(struct trace_array *tr); |
bc0c38d1 | 391 | void (*open)(struct trace_iterator *iter); |
107bad8b | 392 | void (*pipe_open)(struct trace_iterator *iter); |
bc0c38d1 | 393 | void (*close)(struct trace_iterator *iter); |
c521efd1 | 394 | void (*pipe_close)(struct trace_iterator *iter); |
107bad8b SR |
395 | ssize_t (*read)(struct trace_iterator *iter, |
396 | struct file *filp, char __user *ubuf, | |
397 | size_t cnt, loff_t *ppos); | |
3c56819b EGM |
398 | ssize_t (*splice_read)(struct trace_iterator *iter, |
399 | struct file *filp, | |
400 | loff_t *ppos, | |
401 | struct pipe_inode_info *pipe, | |
402 | size_t len, | |
403 | unsigned int flags); | |
60a11774 SR |
404 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
405 | int (*selftest)(struct tracer *trace, | |
406 | struct trace_array *tr); | |
407 | #endif | |
8bba1bf5 | 408 | void (*print_header)(struct seq_file *m); |
2c4f035f | 409 | enum print_line_t (*print_line)(struct trace_iterator *iter); |
adf9f195 | 410 | /* If you handled the flag setting, return 0 */ |
8c1a49ae SRRH |
411 | int (*set_flag)(struct trace_array *tr, |
412 | u32 old_flags, u32 bit, int set); | |
613f04a0 | 413 | /* Return 0 if OK with change, else return non-zero */ |
bf6065b5 | 414 | int (*flag_changed)(struct trace_array *tr, |
613f04a0 | 415 | u32 mask, int set); |
bc0c38d1 | 416 | struct tracer *next; |
9de36825 | 417 | struct tracer_flags *flags; |
50512ab5 | 418 | int enabled; |
cf6ab6d9 | 419 | int ref; |
f43c738b | 420 | bool print_max; |
607e2ea1 | 421 | bool allow_instances; |
12883efb | 422 | #ifdef CONFIG_TRACER_MAX_TRACE |
f43c738b | 423 | bool use_max_tr; |
12883efb | 424 | #endif |
bc0c38d1 SR |
425 | }; |
426 | ||
f9520750 | 427 | |
e4a3f541 | 428 | /* Only current can touch trace_recursion */ |
e4a3f541 | 429 | |
edc15caf SR |
430 | /* |
431 | * For function tracing recursion: | |
432 | * The order of these bits are important. | |
433 | * | |
434 | * When function tracing occurs, the following steps are made: | |
435 | * If arch does not support a ftrace feature: | |
436 | * call internal function (uses INTERNAL bits) which calls... | |
437 | * If callback is registered to the "global" list, the list | |
438 | * function is called and recursion checks the GLOBAL bits. | |
439 | * then this function calls... | |
440 | * The function callback, which can use the FTRACE bits to | |
441 | * check for recursion. | |
442 | * | |
443 | * Now if the arch does not suppport a feature, and it calls | |
444 | * the global list function which calls the ftrace callback | |
445 | * all three of these steps will do a recursion protection. | |
446 | * There's no reason to do one if the previous caller already | |
447 | * did. The recursion that we are protecting against will | |
448 | * go through the same steps again. | |
449 | * | |
450 | * To prevent the multiple recursion checks, if a recursion | |
451 | * bit is set that is higher than the MAX bit of the current | |
452 | * check, then we know that the check was made by the previous | |
453 | * caller, and we can skip the current check. | |
454 | */ | |
e46cbf75 | 455 | enum { |
567cd4da SR |
456 | TRACE_BUFFER_BIT, |
457 | TRACE_BUFFER_NMI_BIT, | |
458 | TRACE_BUFFER_IRQ_BIT, | |
459 | TRACE_BUFFER_SIRQ_BIT, | |
460 | ||
461 | /* Start of function recursion bits */ | |
462 | TRACE_FTRACE_BIT, | |
edc15caf SR |
463 | TRACE_FTRACE_NMI_BIT, |
464 | TRACE_FTRACE_IRQ_BIT, | |
465 | TRACE_FTRACE_SIRQ_BIT, | |
e46cbf75 | 466 | |
4104d326 | 467 | /* INTERNAL_BITs must be greater than FTRACE_BITs */ |
edc15caf SR |
468 | TRACE_INTERNAL_BIT, |
469 | TRACE_INTERNAL_NMI_BIT, | |
470 | TRACE_INTERNAL_IRQ_BIT, | |
471 | TRACE_INTERNAL_SIRQ_BIT, | |
472 | ||
e46cbf75 | 473 | TRACE_CONTROL_BIT, |
e248491a | 474 | |
6224beb1 | 475 | TRACE_BRANCH_BIT, |
e4a3f541 SR |
476 | /* |
477 | * Abuse of the trace_recursion. | |
478 | * As we need a way to maintain state if we are tracing the function | |
479 | * graph in irq because we want to trace a particular function that | |
480 | * was called in irq context but we have irq tracing off. Since this | |
481 | * can only be modified by current, we can reuse trace_recursion. | |
482 | */ | |
e46cbf75 SR |
483 | TRACE_IRQ_BIT, |
484 | }; | |
e4a3f541 | 485 | |
e46cbf75 SR |
486 | #define trace_recursion_set(bit) do { (current)->trace_recursion |= (1<<(bit)); } while (0) |
487 | #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(1<<(bit)); } while (0) | |
488 | #define trace_recursion_test(bit) ((current)->trace_recursion & (1<<(bit))) | |
e4a3f541 | 489 | |
edc15caf SR |
490 | #define TRACE_CONTEXT_BITS 4 |
491 | ||
492 | #define TRACE_FTRACE_START TRACE_FTRACE_BIT | |
493 | #define TRACE_FTRACE_MAX ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1) | |
494 | ||
edc15caf SR |
495 | #define TRACE_LIST_START TRACE_INTERNAL_BIT |
496 | #define TRACE_LIST_MAX ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1) | |
497 | ||
498 | #define TRACE_CONTEXT_MASK TRACE_LIST_MAX | |
499 | ||
500 | static __always_inline int trace_get_context_bit(void) | |
501 | { | |
502 | int bit; | |
503 | ||
504 | if (in_interrupt()) { | |
505 | if (in_nmi()) | |
506 | bit = 0; | |
507 | ||
508 | else if (in_irq()) | |
509 | bit = 1; | |
510 | else | |
511 | bit = 2; | |
512 | } else | |
513 | bit = 3; | |
514 | ||
515 | return bit; | |
516 | } | |
517 | ||
518 | static __always_inline int trace_test_and_set_recursion(int start, int max) | |
519 | { | |
520 | unsigned int val = current->trace_recursion; | |
521 | int bit; | |
522 | ||
523 | /* A previous recursion check was made */ | |
524 | if ((val & TRACE_CONTEXT_MASK) > max) | |
525 | return 0; | |
526 | ||
527 | bit = trace_get_context_bit() + start; | |
528 | if (unlikely(val & (1 << bit))) | |
529 | return -1; | |
530 | ||
531 | val |= 1 << bit; | |
532 | current->trace_recursion = val; | |
533 | barrier(); | |
534 | ||
535 | return bit; | |
536 | } | |
537 | ||
538 | static __always_inline void trace_clear_recursion(int bit) | |
539 | { | |
540 | unsigned int val = current->trace_recursion; | |
541 | ||
542 | if (!bit) | |
543 | return; | |
544 | ||
545 | bit = 1 << bit; | |
546 | val &= ~bit; | |
547 | ||
548 | barrier(); | |
549 | current->trace_recursion = val; | |
550 | } | |
551 | ||
6d158a81 SR |
552 | static inline struct ring_buffer_iter * |
553 | trace_buffer_iter(struct trace_iterator *iter, int cpu) | |
554 | { | |
555 | if (iter->buffer_iter && iter->buffer_iter[cpu]) | |
556 | return iter->buffer_iter[cpu]; | |
557 | return NULL; | |
558 | } | |
559 | ||
b6f11df2 | 560 | int tracer_init(struct tracer *t, struct trace_array *tr); |
9036990d | 561 | int tracing_is_enabled(void); |
12883efb SRRH |
562 | void tracing_reset(struct trace_buffer *buf, int cpu); |
563 | void tracing_reset_online_cpus(struct trace_buffer *buf); | |
9456f0fa | 564 | void tracing_reset_current(int cpu); |
873c642f | 565 | void tracing_reset_all_online_cpus(void); |
bc0c38d1 | 566 | int tracing_open_generic(struct inode *inode, struct file *filp); |
2e86421d | 567 | bool tracing_is_disabled(void); |
5452af66 | 568 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 569 | umode_t mode, |
5452af66 FW |
570 | struct dentry *parent, |
571 | void *data, | |
572 | const struct file_operations *fops); | |
573 | ||
bc0c38d1 | 574 | struct dentry *tracing_init_dentry(void); |
d618b3e6 | 575 | |
51a763dd ACM |
576 | struct ring_buffer_event; |
577 | ||
e77405ad SR |
578 | struct ring_buffer_event * |
579 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
580 | int type, | |
581 | unsigned long len, | |
582 | unsigned long flags, | |
583 | int pc); | |
51a763dd | 584 | |
45dcd8b8 PP |
585 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, |
586 | struct trace_array_cpu *data); | |
c4a8e8be FW |
587 | |
588 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, | |
589 | int *ent_cpu, u64 *ent_ts); | |
590 | ||
7ffbd48d SR |
591 | void __buffer_unlock_commit(struct ring_buffer *buffer, |
592 | struct ring_buffer_event *event); | |
593 | ||
955b61e5 JW |
594 | int trace_empty(struct trace_iterator *iter); |
595 | ||
596 | void *trace_find_next_entry_inc(struct trace_iterator *iter); | |
597 | ||
598 | void trace_init_global_iter(struct trace_iterator *iter); | |
599 | ||
600 | void tracing_iter_reset(struct trace_iterator *iter, int cpu); | |
601 | ||
6fb44b71 | 602 | void trace_function(struct trace_array *tr, |
6fb44b71 SR |
603 | unsigned long ip, |
604 | unsigned long parent_ip, | |
38697053 | 605 | unsigned long flags, int pc); |
0a772620 JO |
606 | void trace_graph_function(struct trace_array *tr, |
607 | unsigned long ip, | |
608 | unsigned long parent_ip, | |
609 | unsigned long flags, int pc); | |
7e9a49ef | 610 | void trace_latency_header(struct seq_file *m); |
62b915f1 JO |
611 | void trace_default_header(struct seq_file *m); |
612 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter); | |
613 | int trace_empty(struct trace_iterator *iter); | |
bc0c38d1 | 614 | |
287b6e68 | 615 | void trace_graph_return(struct ftrace_graph_ret *trace); |
e49dc19c | 616 | int trace_graph_entry(struct ftrace_graph_ent *trace); |
1a0799a8 | 617 | void set_graph_array(struct trace_array *tr); |
1e9b51c2 | 618 | |
41bc8144 SR |
619 | void tracing_start_cmdline_record(void); |
620 | void tracing_stop_cmdline_record(void); | |
bc0c38d1 | 621 | int register_tracer(struct tracer *type); |
b5130b1e | 622 | int is_tracing_stopped(void); |
955b61e5 | 623 | |
098c879e SRRH |
624 | loff_t tracing_lseek(struct file *file, loff_t offset, int whence); |
625 | ||
955b61e5 JW |
626 | extern cpumask_var_t __read_mostly tracing_buffer_mask; |
627 | ||
628 | #define for_each_tracing_cpu(cpu) \ | |
629 | for_each_cpu(cpu, tracing_buffer_mask) | |
bc0c38d1 SR |
630 | |
631 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); | |
632 | ||
0e950173 TB |
633 | extern unsigned long tracing_thresh; |
634 | ||
5d4a9dba | 635 | #ifdef CONFIG_TRACER_MAX_TRACE |
bc0c38d1 SR |
636 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); |
637 | void update_max_tr_single(struct trace_array *tr, | |
638 | struct task_struct *tsk, int cpu); | |
5d4a9dba | 639 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 640 | |
c0a0d0d3 | 641 | #ifdef CONFIG_STACKTRACE |
e77405ad | 642 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, |
c0a0d0d3 FW |
643 | int pc); |
644 | ||
645 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, | |
646 | int pc); | |
647 | #else | |
e1f7992e | 648 | static inline void ftrace_trace_userstack(struct ring_buffer *buffer, |
c0a0d0d3 FW |
649 | unsigned long flags, int pc) |
650 | { | |
651 | } | |
652 | ||
653 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags, | |
654 | int skip, int pc) | |
655 | { | |
656 | } | |
657 | #endif /* CONFIG_STACKTRACE */ | |
53614991 | 658 | |
e309b41d | 659 | extern cycle_t ftrace_now(int cpu); |
bc0c38d1 | 660 | |
4ca53085 | 661 | extern void trace_find_cmdline(int pid, char comm[]); |
f7d48cbd | 662 | |
bc0c38d1 SR |
663 | #ifdef CONFIG_DYNAMIC_FTRACE |
664 | extern unsigned long ftrace_update_tot_cnt; | |
ad97772a | 665 | #endif |
d05cdb25 SR |
666 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func |
667 | extern int DYN_FTRACE_TEST_NAME(void); | |
95950c2e SR |
668 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2 |
669 | extern int DYN_FTRACE_TEST_NAME2(void); | |
bc0c38d1 | 670 | |
55034cd6 | 671 | extern bool ring_buffer_expanded; |
020e5f85 | 672 | extern bool tracing_selftest_disabled; |
9288f99a | 673 | DECLARE_PER_CPU(int, ftrace_cpu_disabled); |
020e5f85 | 674 | |
60a11774 | 675 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
60a11774 SR |
676 | extern int trace_selftest_startup_function(struct tracer *trace, |
677 | struct trace_array *tr); | |
7447dce9 FW |
678 | extern int trace_selftest_startup_function_graph(struct tracer *trace, |
679 | struct trace_array *tr); | |
60a11774 SR |
680 | extern int trace_selftest_startup_irqsoff(struct tracer *trace, |
681 | struct trace_array *tr); | |
60a11774 SR |
682 | extern int trace_selftest_startup_preemptoff(struct tracer *trace, |
683 | struct trace_array *tr); | |
60a11774 SR |
684 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, |
685 | struct trace_array *tr); | |
60a11774 SR |
686 | extern int trace_selftest_startup_wakeup(struct tracer *trace, |
687 | struct trace_array *tr); | |
fb1b6d8b SN |
688 | extern int trace_selftest_startup_nop(struct tracer *trace, |
689 | struct trace_array *tr); | |
60a11774 SR |
690 | extern int trace_selftest_startup_sched_switch(struct tracer *trace, |
691 | struct trace_array *tr); | |
80e5ea45 SR |
692 | extern int trace_selftest_startup_branch(struct tracer *trace, |
693 | struct trace_array *tr); | |
8f768993 SRRH |
694 | /* |
695 | * Tracer data references selftest functions that only occur | |
696 | * on boot up. These can be __init functions. Thus, when selftests | |
697 | * are enabled, then the tracers need to reference __init functions. | |
698 | */ | |
699 | #define __tracer_data __refdata | |
700 | #else | |
701 | /* Tracers are seldom changed. Optimize when selftests are disabled. */ | |
702 | #define __tracer_data __read_mostly | |
60a11774 SR |
703 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
704 | ||
c7aafc54 | 705 | extern void *head_page(struct trace_array_cpu *data); |
cf8e3474 | 706 | extern unsigned long long ns2usecs(cycle_t nsec); |
1fd8f2a3 | 707 | extern int |
40ce74f1 | 708 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args); |
48ead020 | 709 | extern int |
40ce74f1 | 710 | trace_vprintk(unsigned long ip, const char *fmt, va_list args); |
659372d3 SR |
711 | extern int |
712 | trace_array_vprintk(struct trace_array *tr, | |
713 | unsigned long ip, const char *fmt, va_list args); | |
714 | int trace_array_printk(struct trace_array *tr, | |
715 | unsigned long ip, const char *fmt, ...); | |
12883efb SRRH |
716 | int trace_array_printk_buf(struct ring_buffer *buffer, |
717 | unsigned long ip, const char *fmt, ...); | |
955b61e5 JW |
718 | void trace_printk_seq(struct trace_seq *s); |
719 | enum print_line_t print_trace_line(struct trace_iterator *iter); | |
c7aafc54 | 720 | |
8e1e1df2 BP |
721 | extern char trace_find_mark(unsigned long long duration); |
722 | ||
15e6cb36 | 723 | /* Standard output formatting function used for function return traces */ |
fb52607a | 724 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
62b915f1 JO |
725 | |
726 | /* Flag options */ | |
727 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1 | |
728 | #define TRACE_GRAPH_PRINT_CPU 0x2 | |
729 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 | |
730 | #define TRACE_GRAPH_PRINT_PROC 0x8 | |
731 | #define TRACE_GRAPH_PRINT_DURATION 0x10 | |
732 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 | |
ccdb5946 | 733 | #define TRACE_GRAPH_PRINT_IRQS 0x40 |
607e3a29 | 734 | #define TRACE_GRAPH_PRINT_TAIL 0x80 |
55577204 SRRH |
735 | #define TRACE_GRAPH_SLEEP_TIME 0x100 |
736 | #define TRACE_GRAPH_GRAPH_TIME 0x200 | |
6fc84ea7 SRRH |
737 | #define TRACE_GRAPH_PRINT_FILL_SHIFT 28 |
738 | #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) | |
62b915f1 | 739 | |
55577204 SRRH |
740 | extern void ftrace_graph_sleep_time_control(bool enable); |
741 | extern void ftrace_graph_graph_time_control(bool enable); | |
742 | ||
d7a8d9e9 JO |
743 | extern enum print_line_t |
744 | print_graph_function_flags(struct trace_iterator *iter, u32 flags); | |
745 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags); | |
9d9add34 | 746 | extern void |
0706f1c4 | 747 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s); |
62b915f1 JO |
748 | extern void graph_trace_open(struct trace_iterator *iter); |
749 | extern void graph_trace_close(struct trace_iterator *iter); | |
750 | extern int __trace_graph_entry(struct trace_array *tr, | |
751 | struct ftrace_graph_ent *trace, | |
752 | unsigned long flags, int pc); | |
753 | extern void __trace_graph_return(struct trace_array *tr, | |
754 | struct ftrace_graph_ret *trace, | |
755 | unsigned long flags, int pc); | |
756 | ||
ea4e2bc4 SR |
757 | |
758 | #ifdef CONFIG_DYNAMIC_FTRACE | |
759 | /* TODO: make this variable */ | |
760 | #define FTRACE_GRAPH_MAX_FUNCS 32 | |
761 | extern int ftrace_graph_count; | |
762 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
29ad23b0 NK |
763 | extern int ftrace_graph_notrace_count; |
764 | extern unsigned long ftrace_graph_notrace_funcs[FTRACE_GRAPH_MAX_FUNCS]; | |
ea4e2bc4 SR |
765 | |
766 | static inline int ftrace_graph_addr(unsigned long addr) | |
767 | { | |
768 | int i; | |
769 | ||
9aa72b4b | 770 | if (!ftrace_graph_count) |
ea4e2bc4 SR |
771 | return 1; |
772 | ||
773 | for (i = 0; i < ftrace_graph_count; i++) { | |
e4a3f541 SR |
774 | if (addr == ftrace_graph_funcs[i]) { |
775 | /* | |
776 | * If no irqs are to be traced, but a set_graph_function | |
777 | * is set, and called by an interrupt handler, we still | |
778 | * want to trace it. | |
779 | */ | |
780 | if (in_irq()) | |
781 | trace_recursion_set(TRACE_IRQ_BIT); | |
782 | else | |
783 | trace_recursion_clear(TRACE_IRQ_BIT); | |
ea4e2bc4 | 784 | return 1; |
e4a3f541 | 785 | } |
ea4e2bc4 SR |
786 | } |
787 | ||
788 | return 0; | |
789 | } | |
29ad23b0 NK |
790 | |
791 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
792 | { | |
793 | int i; | |
794 | ||
795 | if (!ftrace_graph_notrace_count) | |
796 | return 0; | |
797 | ||
798 | for (i = 0; i < ftrace_graph_notrace_count; i++) { | |
799 | if (addr == ftrace_graph_notrace_funcs[i]) | |
800 | return 1; | |
801 | } | |
802 | ||
803 | return 0; | |
804 | } | |
15e6cb36 | 805 | #else |
6b253930 IM |
806 | static inline int ftrace_graph_addr(unsigned long addr) |
807 | { | |
808 | return 1; | |
ea4e2bc4 | 809 | } |
29ad23b0 NK |
810 | |
811 | static inline int ftrace_graph_notrace_addr(unsigned long addr) | |
812 | { | |
813 | return 0; | |
814 | } | |
ea4e2bc4 | 815 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
ea4e2bc4 | 816 | #else /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 817 | static inline enum print_line_t |
d7a8d9e9 | 818 | print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
15e6cb36 FW |
819 | { |
820 | return TRACE_TYPE_UNHANDLED; | |
821 | } | |
ea4e2bc4 | 822 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 823 | |
756d17ee | 824 | extern struct list_head ftrace_pids; |
804a6851 | 825 | |
1155de47 | 826 | #ifdef CONFIG_FUNCTION_TRACER |
f1ed7c74 | 827 | extern bool ftrace_filter_param __initdata; |
804a6851 SR |
828 | static inline int ftrace_trace_task(struct task_struct *task) |
829 | { | |
756d17ee | 830 | if (list_empty(&ftrace_pids)) |
804a6851 SR |
831 | return 1; |
832 | ||
833 | return test_tsk_trace_trace(task); | |
834 | } | |
e0a413f6 | 835 | extern int ftrace_is_dead(void); |
591dffda SRRH |
836 | int ftrace_create_function_files(struct trace_array *tr, |
837 | struct dentry *parent); | |
838 | void ftrace_destroy_function_files(struct trace_array *tr); | |
4104d326 SRRH |
839 | void ftrace_init_global_array_ops(struct trace_array *tr); |
840 | void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func); | |
841 | void ftrace_reset_array_ops(struct trace_array *tr); | |
7eea4fce | 842 | int using_ftrace_ops_list_func(void); |
1155de47 PM |
843 | #else |
844 | static inline int ftrace_trace_task(struct task_struct *task) | |
845 | { | |
846 | return 1; | |
847 | } | |
e0a413f6 | 848 | static inline int ftrace_is_dead(void) { return 0; } |
591dffda SRRH |
849 | static inline int |
850 | ftrace_create_function_files(struct trace_array *tr, | |
851 | struct dentry *parent) | |
852 | { | |
853 | return 0; | |
854 | } | |
855 | static inline void ftrace_destroy_function_files(struct trace_array *tr) { } | |
4104d326 SRRH |
856 | static inline __init void |
857 | ftrace_init_global_array_ops(struct trace_array *tr) { } | |
858 | static inline void ftrace_reset_array_ops(struct trace_array *tr) { } | |
859 | /* ftace_func_t type is not defined, use macro instead of static inline */ | |
860 | #define ftrace_init_array_ops(tr, func) do { } while (0) | |
591dffda SRRH |
861 | #endif /* CONFIG_FUNCTION_TRACER */ |
862 | ||
863 | #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) | |
864 | void ftrace_create_filter_files(struct ftrace_ops *ops, | |
865 | struct dentry *parent); | |
866 | void ftrace_destroy_filter_files(struct ftrace_ops *ops); | |
867 | #else | |
868 | /* | |
869 | * The ops parameter passed in is usually undefined. | |
870 | * This must be a macro. | |
871 | */ | |
872 | #define ftrace_create_filter_files(ops, parent) do { } while (0) | |
873 | #define ftrace_destroy_filter_files(ops) do { } while (0) | |
874 | #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */ | |
804a6851 | 875 | |
2425bcb9 | 876 | int ftrace_event_is_function(struct trace_event_call *call); |
ced39002 | 877 | |
b63f39ea | 878 | /* |
879 | * struct trace_parser - servers for reading the user input separated by spaces | |
880 | * @cont: set if the input is not complete - no final space char was found | |
881 | * @buffer: holds the parsed user input | |
1537a363 | 882 | * @idx: user input length |
b63f39ea | 883 | * @size: buffer size |
884 | */ | |
885 | struct trace_parser { | |
886 | bool cont; | |
887 | char *buffer; | |
888 | unsigned idx; | |
889 | unsigned size; | |
890 | }; | |
891 | ||
892 | static inline bool trace_parser_loaded(struct trace_parser *parser) | |
893 | { | |
894 | return (parser->idx != 0); | |
895 | } | |
896 | ||
897 | static inline bool trace_parser_cont(struct trace_parser *parser) | |
898 | { | |
899 | return parser->cont; | |
900 | } | |
901 | ||
902 | static inline void trace_parser_clear(struct trace_parser *parser) | |
903 | { | |
904 | parser->cont = false; | |
905 | parser->idx = 0; | |
906 | } | |
907 | ||
908 | extern int trace_parser_get_init(struct trace_parser *parser, int size); | |
909 | extern void trace_parser_put(struct trace_parser *parser); | |
910 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
911 | size_t cnt, loff_t *ppos); | |
912 | ||
729358da SRRH |
913 | /* |
914 | * Only create function graph options if function graph is configured. | |
915 | */ | |
916 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
917 | # define FGRAPH_FLAGS \ | |
729358da | 918 | C(DISPLAY_GRAPH, "display-graph"), |
729358da SRRH |
919 | #else |
920 | # define FGRAPH_FLAGS | |
729358da SRRH |
921 | #endif |
922 | ||
4ee4301c SRRH |
923 | #ifdef CONFIG_BRANCH_TRACER |
924 | # define BRANCH_FLAGS \ | |
925 | C(BRANCH, "branch"), | |
926 | #else | |
927 | # define BRANCH_FLAGS | |
928 | #endif | |
929 | ||
8179e8a1 SRRH |
930 | #ifdef CONFIG_FUNCTION_TRACER |
931 | # define FUNCTION_FLAGS \ | |
932 | C(FUNCTION, "function-trace"), | |
933 | # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION | |
934 | #else | |
935 | # define FUNCTION_FLAGS | |
936 | # define FUNCTION_DEFAULT_FLAGS 0UL | |
937 | #endif | |
938 | ||
73dddbb5 SRRH |
939 | #ifdef CONFIG_STACKTRACE |
940 | # define STACK_FLAGS \ | |
941 | C(STACKTRACE, "stacktrace"), | |
942 | #else | |
943 | # define STACK_FLAGS | |
944 | #endif | |
945 | ||
4fcdae83 SR |
946 | /* |
947 | * trace_iterator_flags is an enumeration that defines bit | |
948 | * positions into trace_flags that controls the output. | |
949 | * | |
950 | * NOTE: These bits must match the trace_options array in | |
a3418a36 | 951 | * trace.c (this macro guarantees it). |
4fcdae83 | 952 | */ |
a3418a36 SRRH |
953 | #define TRACE_FLAGS \ |
954 | C(PRINT_PARENT, "print-parent"), \ | |
955 | C(SYM_OFFSET, "sym-offset"), \ | |
956 | C(SYM_ADDR, "sym-addr"), \ | |
957 | C(VERBOSE, "verbose"), \ | |
958 | C(RAW, "raw"), \ | |
959 | C(HEX, "hex"), \ | |
960 | C(BIN, "bin"), \ | |
961 | C(BLOCK, "block"), \ | |
a3418a36 | 962 | C(PRINTK, "trace_printk"), \ |
a3418a36 SRRH |
963 | C(ANNOTATE, "annotate"), \ |
964 | C(USERSTACKTRACE, "userstacktrace"), \ | |
965 | C(SYM_USEROBJ, "sym-userobj"), \ | |
966 | C(PRINTK_MSGONLY, "printk-msg-only"), \ | |
967 | C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \ | |
968 | C(LATENCY_FMT, "latency-format"), \ | |
a3418a36 SRRH |
969 | C(RECORD_CMD, "record-cmd"), \ |
970 | C(OVERWRITE, "overwrite"), \ | |
971 | C(STOP_ON_FREE, "disable_on_free"), \ | |
972 | C(IRQ_INFO, "irq-info"), \ | |
973 | C(MARKERS, "markers"), \ | |
8179e8a1 | 974 | FUNCTION_FLAGS \ |
4ee4301c | 975 | FGRAPH_FLAGS \ |
73dddbb5 | 976 | STACK_FLAGS \ |
4ee4301c | 977 | BRANCH_FLAGS |
ce3fed62 | 978 | |
a3418a36 SRRH |
979 | /* |
980 | * By defining C, we can make TRACE_FLAGS a list of bit names | |
981 | * that will define the bits for the flag masks. | |
982 | */ | |
983 | #undef C | |
984 | #define C(a, b) TRACE_ITER_##a##_BIT | |
985 | ||
b5e87c05 SRRH |
986 | enum trace_iterator_bits { |
987 | TRACE_FLAGS | |
988 | /* Make sure we don't go more than we have bits for */ | |
989 | TRACE_ITER_LAST_BIT | |
990 | }; | |
a3418a36 SRRH |
991 | |
992 | /* | |
993 | * By redefining C, we can make TRACE_FLAGS a list of masks that | |
994 | * use the bits as defined above. | |
995 | */ | |
996 | #undef C | |
997 | #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT) | |
998 | ||
999 | enum trace_iterator_flags { TRACE_FLAGS }; | |
4e655519 | 1000 | |
15e6cb36 FW |
1001 | /* |
1002 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
1003 | * control the output of kernel symbols. | |
1004 | */ | |
1005 | #define TRACE_ITER_SYM_MASK \ | |
1006 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
1007 | ||
43a15386 FW |
1008 | extern struct tracer nop_trace; |
1009 | ||
2ed84eeb | 1010 | #ifdef CONFIG_BRANCH_TRACER |
9f029e83 SR |
1011 | extern int enable_branch_tracing(struct trace_array *tr); |
1012 | extern void disable_branch_tracing(void); | |
1013 | static inline int trace_branch_enable(struct trace_array *tr) | |
52f232cb | 1014 | { |
983f938a | 1015 | if (tr->trace_flags & TRACE_ITER_BRANCH) |
9f029e83 | 1016 | return enable_branch_tracing(tr); |
52f232cb SR |
1017 | return 0; |
1018 | } | |
9f029e83 | 1019 | static inline void trace_branch_disable(void) |
52f232cb SR |
1020 | { |
1021 | /* due to races, always disable */ | |
9f029e83 | 1022 | disable_branch_tracing(); |
52f232cb SR |
1023 | } |
1024 | #else | |
9f029e83 | 1025 | static inline int trace_branch_enable(struct trace_array *tr) |
52f232cb SR |
1026 | { |
1027 | return 0; | |
1028 | } | |
9f029e83 | 1029 | static inline void trace_branch_disable(void) |
52f232cb SR |
1030 | { |
1031 | } | |
2ed84eeb | 1032 | #endif /* CONFIG_BRANCH_TRACER */ |
52f232cb | 1033 | |
1852fcce SR |
1034 | /* set ring buffers to default size if not already done so */ |
1035 | int tracing_update_buffers(void); | |
1036 | ||
cf027f64 TZ |
1037 | struct ftrace_event_field { |
1038 | struct list_head link; | |
92edca07 SR |
1039 | const char *name; |
1040 | const char *type; | |
aa38e9fc | 1041 | int filter_type; |
cf027f64 TZ |
1042 | int offset; |
1043 | int size; | |
a118e4d1 | 1044 | int is_signed; |
cf027f64 TZ |
1045 | }; |
1046 | ||
30e673b2 | 1047 | struct event_filter { |
c9c53ca0 SR |
1048 | int n_preds; /* Number assigned */ |
1049 | int a_preds; /* allocated */ | |
74e9e58c | 1050 | struct filter_pred *preds; |
61e9dea2 | 1051 | struct filter_pred *root; |
8b372562 | 1052 | char *filter_string; |
30e673b2 TZ |
1053 | }; |
1054 | ||
cfb180f3 TZ |
1055 | struct event_subsystem { |
1056 | struct list_head list; | |
1057 | const char *name; | |
1f9963cb | 1058 | struct event_filter *filter; |
e9dbfae5 | 1059 | int ref_count; |
cfb180f3 TZ |
1060 | }; |
1061 | ||
7967b3e0 | 1062 | struct trace_subsystem_dir { |
ae63b31e SR |
1063 | struct list_head list; |
1064 | struct event_subsystem *subsystem; | |
1065 | struct trace_array *tr; | |
1066 | struct dentry *entry; | |
1067 | int ref_count; | |
1068 | int nr_events; | |
1069 | }; | |
1070 | ||
61e9dea2 SR |
1071 | #define FILTER_PRED_INVALID ((unsigned short)-1) |
1072 | #define FILTER_PRED_IS_RIGHT (1 << 15) | |
43cd4145 | 1073 | #define FILTER_PRED_FOLD (1 << 15) |
61e9dea2 | 1074 | |
bf93f9ed SR |
1075 | /* |
1076 | * The max preds is the size of unsigned short with | |
1077 | * two flags at the MSBs. One bit is used for both the IS_RIGHT | |
1078 | * and FOLD flags. The other is reserved. | |
1079 | * | |
1080 | * 2^14 preds is way more than enough. | |
1081 | */ | |
1082 | #define MAX_FILTER_PRED 16384 | |
4a3d27e9 | 1083 | |
7ce7e424 | 1084 | struct filter_pred; |
1889d209 | 1085 | struct regex; |
7ce7e424 | 1086 | |
58d9a597 | 1087 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event); |
7ce7e424 | 1088 | |
1889d209 FW |
1089 | typedef int (*regex_match_func)(char *str, struct regex *r, int len); |
1090 | ||
3f6fe06d | 1091 | enum regex_type { |
b0f1a59a | 1092 | MATCH_FULL = 0, |
3f6fe06d FW |
1093 | MATCH_FRONT_ONLY, |
1094 | MATCH_MIDDLE_ONLY, | |
1095 | MATCH_END_ONLY, | |
1096 | }; | |
1097 | ||
1889d209 FW |
1098 | struct regex { |
1099 | char pattern[MAX_FILTER_STR_VAL]; | |
1100 | int len; | |
1101 | int field_len; | |
1102 | regex_match_func match; | |
1103 | }; | |
1104 | ||
7ce7e424 | 1105 | struct filter_pred { |
1889d209 FW |
1106 | filter_pred_fn_t fn; |
1107 | u64 val; | |
1108 | struct regex regex; | |
61aaef55 | 1109 | unsigned short *ops; |
1d0e78e3 | 1110 | struct ftrace_event_field *field; |
1889d209 FW |
1111 | int offset; |
1112 | int not; | |
1113 | int op; | |
61e9dea2 SR |
1114 | unsigned short index; |
1115 | unsigned short parent; | |
1116 | unsigned short left; | |
1117 | unsigned short right; | |
7ce7e424 TZ |
1118 | }; |
1119 | ||
3f6fe06d FW |
1120 | extern enum regex_type |
1121 | filter_parse_regex(char *buff, int len, char **search, int *not); | |
7f1d2f82 | 1122 | extern void print_event_filter(struct trace_event_file *file, |
4bda2d51 | 1123 | struct trace_seq *s); |
7f1d2f82 | 1124 | extern int apply_event_filter(struct trace_event_file *file, |
8b372562 | 1125 | char *filter_string); |
7967b3e0 | 1126 | extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir, |
8b372562 TZ |
1127 | char *filter_string); |
1128 | extern void print_subsystem_event_filter(struct event_subsystem *system, | |
ac1adc55 | 1129 | struct trace_seq *s); |
aa38e9fc | 1130 | extern int filter_assign_type(const char *type); |
2425bcb9 | 1131 | extern int create_event_filter(struct trace_event_call *call, |
bac5fb97 TZ |
1132 | char *filter_str, bool set_str, |
1133 | struct event_filter **filterp); | |
1134 | extern void free_event_filter(struct event_filter *filter); | |
7ce7e424 | 1135 | |
b3a8c6fd | 1136 | struct ftrace_event_field * |
2425bcb9 | 1137 | trace_find_event_field(struct trace_event_call *call, char *name); |
2e33af02 | 1138 | |
e870e9a1 | 1139 | extern void trace_event_enable_cmd_record(bool enable); |
277ba044 | 1140 | extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr); |
0c8916c3 | 1141 | extern int event_trace_del_tracer(struct trace_array *tr); |
e870e9a1 | 1142 | |
7f1d2f82 SRRH |
1143 | extern struct trace_event_file *find_event_file(struct trace_array *tr, |
1144 | const char *system, | |
1145 | const char *event); | |
7862ad18 | 1146 | |
85f2b082 TZ |
1147 | static inline void *event_file_data(struct file *filp) |
1148 | { | |
1149 | return ACCESS_ONCE(file_inode(filp)->i_private); | |
1150 | } | |
1151 | ||
20c8928a | 1152 | extern struct mutex event_mutex; |
a59fd602 | 1153 | extern struct list_head ftrace_events; |
ac199db0 | 1154 | |
85f2b082 TZ |
1155 | extern const struct file_operations event_trigger_fops; |
1156 | ||
1157 | extern int register_trigger_cmds(void); | |
1158 | extern void clear_event_triggers(struct trace_array *tr); | |
1159 | ||
1160 | struct event_trigger_data { | |
1161 | unsigned long count; | |
1162 | int ref; | |
1163 | struct event_trigger_ops *ops; | |
1164 | struct event_command *cmd_ops; | |
d8a30f20 | 1165 | struct event_filter __rcu *filter; |
85f2b082 TZ |
1166 | char *filter_str; |
1167 | void *private_data; | |
1168 | struct list_head list; | |
1169 | }; | |
1170 | ||
1171 | /** | |
1172 | * struct event_trigger_ops - callbacks for trace event triggers | |
1173 | * | |
1174 | * The methods in this structure provide per-event trigger hooks for | |
1175 | * various trigger operations. | |
1176 | * | |
1177 | * All the methods below, except for @init() and @free(), must be | |
1178 | * implemented. | |
1179 | * | |
1180 | * @func: The trigger 'probe' function called when the triggering | |
1181 | * event occurs. The data passed into this callback is the data | |
1182 | * that was supplied to the event_command @reg() function that | |
1183 | * registered the trigger (see struct event_command). | |
1184 | * | |
1185 | * @init: An optional initialization function called for the trigger | |
1186 | * when the trigger is registered (via the event_command reg() | |
1187 | * function). This can be used to perform per-trigger | |
1188 | * initialization such as incrementing a per-trigger reference | |
1189 | * count, for instance. This is usually implemented by the | |
1190 | * generic utility function @event_trigger_init() (see | |
1191 | * trace_event_triggers.c). | |
1192 | * | |
1193 | * @free: An optional de-initialization function called for the | |
1194 | * trigger when the trigger is unregistered (via the | |
1195 | * event_command @reg() function). This can be used to perform | |
1196 | * per-trigger de-initialization such as decrementing a | |
1197 | * per-trigger reference count and freeing corresponding trigger | |
1198 | * data, for instance. This is usually implemented by the | |
1199 | * generic utility function @event_trigger_free() (see | |
1200 | * trace_event_triggers.c). | |
1201 | * | |
1202 | * @print: The callback function invoked to have the trigger print | |
1203 | * itself. This is usually implemented by a wrapper function | |
1204 | * that calls the generic utility function @event_trigger_print() | |
1205 | * (see trace_event_triggers.c). | |
1206 | */ | |
1207 | struct event_trigger_ops { | |
1208 | void (*func)(struct event_trigger_data *data); | |
1209 | int (*init)(struct event_trigger_ops *ops, | |
1210 | struct event_trigger_data *data); | |
1211 | void (*free)(struct event_trigger_ops *ops, | |
1212 | struct event_trigger_data *data); | |
1213 | int (*print)(struct seq_file *m, | |
1214 | struct event_trigger_ops *ops, | |
1215 | struct event_trigger_data *data); | |
1216 | }; | |
1217 | ||
1218 | /** | |
1219 | * struct event_command - callbacks and data members for event commands | |
1220 | * | |
1221 | * Event commands are invoked by users by writing the command name | |
1222 | * into the 'trigger' file associated with a trace event. The | |
1223 | * parameters associated with a specific invocation of an event | |
1224 | * command are used to create an event trigger instance, which is | |
1225 | * added to the list of trigger instances associated with that trace | |
1226 | * event. When the event is hit, the set of triggers associated with | |
1227 | * that event is invoked. | |
1228 | * | |
1229 | * The data members in this structure provide per-event command data | |
1230 | * for various event commands. | |
1231 | * | |
1232 | * All the data members below, except for @post_trigger, must be set | |
1233 | * for each event command. | |
1234 | * | |
1235 | * @name: The unique name that identifies the event command. This is | |
1236 | * the name used when setting triggers via trigger files. | |
1237 | * | |
1238 | * @trigger_type: A unique id that identifies the event command | |
1239 | * 'type'. This value has two purposes, the first to ensure that | |
1240 | * only one trigger of the same type can be set at a given time | |
1241 | * for a particular event e.g. it doesn't make sense to have both | |
1242 | * a traceon and traceoff trigger attached to a single event at | |
1243 | * the same time, so traceon and traceoff have the same type | |
1244 | * though they have different names. The @trigger_type value is | |
1245 | * also used as a bit value for deferring the actual trigger | |
1246 | * action until after the current event is finished. Some | |
1247 | * commands need to do this if they themselves log to the trace | |
1248 | * buffer (see the @post_trigger() member below). @trigger_type | |
1249 | * values are defined by adding new values to the trigger_type | |
af658dca | 1250 | * enum in include/linux/trace_events.h. |
85f2b082 TZ |
1251 | * |
1252 | * @post_trigger: A flag that says whether or not this command needs | |
1253 | * to have its action delayed until after the current event has | |
1254 | * been closed. Some triggers need to avoid being invoked while | |
1255 | * an event is currently in the process of being logged, since | |
1256 | * the trigger may itself log data into the trace buffer. Thus | |
1257 | * we make sure the current event is committed before invoking | |
1258 | * those triggers. To do that, the trigger invocation is split | |
1259 | * in two - the first part checks the filter using the current | |
1260 | * trace record; if a command has the @post_trigger flag set, it | |
1261 | * sets a bit for itself in the return value, otherwise it | |
1262 | * directly invokes the trigger. Once all commands have been | |
1263 | * either invoked or set their return flag, the current record is | |
1264 | * either committed or discarded. At that point, if any commands | |
1265 | * have deferred their triggers, those commands are finally | |
1266 | * invoked following the close of the current event. In other | |
1267 | * words, if the event_trigger_ops @func() probe implementation | |
1268 | * itself logs to the trace buffer, this flag should be set, | |
1269 | * otherwise it can be left unspecified. | |
1270 | * | |
1271 | * All the methods below, except for @set_filter(), must be | |
1272 | * implemented. | |
1273 | * | |
1274 | * @func: The callback function responsible for parsing and | |
1275 | * registering the trigger written to the 'trigger' file by the | |
1276 | * user. It allocates the trigger instance and registers it with | |
1277 | * the appropriate trace event. It makes use of the other | |
1278 | * event_command callback functions to orchestrate this, and is | |
1279 | * usually implemented by the generic utility function | |
1280 | * @event_trigger_callback() (see trace_event_triggers.c). | |
1281 | * | |
1282 | * @reg: Adds the trigger to the list of triggers associated with the | |
1283 | * event, and enables the event trigger itself, after | |
1284 | * initializing it (via the event_trigger_ops @init() function). | |
1285 | * This is also where commands can use the @trigger_type value to | |
1286 | * make the decision as to whether or not multiple instances of | |
1287 | * the trigger should be allowed. This is usually implemented by | |
1288 | * the generic utility function @register_trigger() (see | |
1289 | * trace_event_triggers.c). | |
1290 | * | |
1291 | * @unreg: Removes the trigger from the list of triggers associated | |
1292 | * with the event, and disables the event trigger itself, after | |
1293 | * initializing it (via the event_trigger_ops @free() function). | |
1294 | * This is usually implemented by the generic utility function | |
1295 | * @unregister_trigger() (see trace_event_triggers.c). | |
1296 | * | |
1297 | * @set_filter: An optional function called to parse and set a filter | |
1298 | * for the trigger. If no @set_filter() method is set for the | |
1299 | * event command, filters set by the user for the command will be | |
1300 | * ignored. This is usually implemented by the generic utility | |
1301 | * function @set_trigger_filter() (see trace_event_triggers.c). | |
1302 | * | |
1303 | * @get_trigger_ops: The callback function invoked to retrieve the | |
1304 | * event_trigger_ops implementation associated with the command. | |
1305 | */ | |
1306 | struct event_command { | |
1307 | struct list_head list; | |
1308 | char *name; | |
1309 | enum event_trigger_type trigger_type; | |
1310 | bool post_trigger; | |
1311 | int (*func)(struct event_command *cmd_ops, | |
7f1d2f82 | 1312 | struct trace_event_file *file, |
85f2b082 TZ |
1313 | char *glob, char *cmd, char *params); |
1314 | int (*reg)(char *glob, | |
1315 | struct event_trigger_ops *ops, | |
1316 | struct event_trigger_data *data, | |
7f1d2f82 | 1317 | struct trace_event_file *file); |
85f2b082 TZ |
1318 | void (*unreg)(char *glob, |
1319 | struct event_trigger_ops *ops, | |
1320 | struct event_trigger_data *data, | |
7f1d2f82 | 1321 | struct trace_event_file *file); |
85f2b082 TZ |
1322 | int (*set_filter)(char *filter_str, |
1323 | struct event_trigger_data *data, | |
7f1d2f82 | 1324 | struct trace_event_file *file); |
85f2b082 TZ |
1325 | struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param); |
1326 | }; | |
1327 | ||
7f1d2f82 | 1328 | extern int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 | 1329 | int enable, int soft_disable); |
93e31ffb | 1330 | extern int tracing_alloc_snapshot(void); |
85f2b082 | 1331 | |
e9fb2b6d SR |
1332 | extern const char *__start___trace_bprintk_fmt[]; |
1333 | extern const char *__stop___trace_bprintk_fmt[]; | |
1334 | ||
102c9323 SRRH |
1335 | extern const char *__start___tracepoint_str[]; |
1336 | extern const char *__stop___tracepoint_str[]; | |
1337 | ||
b9f9108c | 1338 | void trace_printk_control(bool enabled); |
07d777fe | 1339 | void trace_printk_init_buffers(void); |
81698831 | 1340 | void trace_printk_start_comm(void); |
613f04a0 | 1341 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set); |
2b6080f2 | 1342 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled); |
07d777fe | 1343 | |
ca268da6 SRRH |
1344 | /* |
1345 | * Normal trace_printk() and friends allocates special buffers | |
1346 | * to do the manipulation, as well as saves the print formats | |
1347 | * into sections to display. But the trace infrastructure wants | |
1348 | * to use these without the added overhead at the price of being | |
1349 | * a bit slower (used mainly for warnings, where we don't care | |
1350 | * about performance). The internal_trace_puts() is for such | |
1351 | * a purpose. | |
1352 | */ | |
1353 | #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str)) | |
1354 | ||
4e5292ea | 1355 | #undef FTRACE_ENTRY |
02aa3162 | 1356 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \ |
2425bcb9 | 1357 | extern struct trace_event_call \ |
52f5684c | 1358 | __aligned(4) event_##call; |
4e5292ea | 1359 | #undef FTRACE_ENTRY_DUP |
02aa3162 JO |
1360 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \ |
1361 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \ | |
1362 | filter) | |
4e5292ea | 1363 | #include "trace_entries.h" |
e1112b4d | 1364 | |
6e48b550 | 1365 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER) |
2425bcb9 | 1366 | int perf_ftrace_event_register(struct trace_event_call *call, |
ced39002 JO |
1367 | enum trace_reg type, void *data); |
1368 | #else | |
1369 | #define perf_ftrace_event_register NULL | |
6e48b550 | 1370 | #endif |
ced39002 | 1371 | |
5f893b26 SRRH |
1372 | #ifdef CONFIG_FTRACE_SYSCALLS |
1373 | void init_ftrace_syscalls(void); | |
1374 | #else | |
1375 | static inline void init_ftrace_syscalls(void) { } | |
1376 | #endif | |
1377 | ||
1378 | #ifdef CONFIG_EVENT_TRACING | |
1379 | void trace_event_init(void); | |
0c564a53 | 1380 | void trace_event_enum_update(struct trace_enum_map **map, int len); |
5f893b26 SRRH |
1381 | #else |
1382 | static inline void __init trace_event_init(void) { } | |
cc9e4bde | 1383 | static inline void trace_event_enum_update(struct trace_enum_map **map, int len) { } |
5f893b26 SRRH |
1384 | #endif |
1385 | ||
0daa2302 | 1386 | extern struct trace_iterator *tracepoint_print_iter; |
5f893b26 | 1387 | |
bc0c38d1 | 1388 | #endif /* _LINUX_KERNEL_TRACE_H */ |