Commit | Line | Data |
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16444a8a ACM |
1 | /* |
2 | * Infrastructure for profiling code inserted by 'gcc -pg'. | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2004-2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally ported from the -rt patch by: | |
8 | * Copyright (C) 2007 Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code in the latency_tracer, that is: | |
11 | * | |
12 | * Copyright (C) 2004-2006 Ingo Molnar | |
13 | * Copyright (C) 2004 William Lee Irwin III | |
14 | */ | |
15 | ||
3d083395 SR |
16 | #include <linux/stop_machine.h> |
17 | #include <linux/clocksource.h> | |
18 | #include <linux/kallsyms.h> | |
5072c59f | 19 | #include <linux/seq_file.h> |
4a2b8dda | 20 | #include <linux/suspend.h> |
5072c59f | 21 | #include <linux/debugfs.h> |
3d083395 | 22 | #include <linux/hardirq.h> |
2d8b820b | 23 | #include <linux/kthread.h> |
5072c59f | 24 | #include <linux/uaccess.h> |
f22f9a89 | 25 | #include <linux/kprobes.h> |
2d8b820b | 26 | #include <linux/ftrace.h> |
b0fc494f | 27 | #include <linux/sysctl.h> |
5072c59f | 28 | #include <linux/ctype.h> |
3d083395 | 29 | #include <linux/list.h> |
59df055f | 30 | #include <linux/hash.h> |
3d083395 | 31 | |
8aef2d28 SR |
32 | #include <trace/sched.h> |
33 | ||
395a59d0 AS |
34 | #include <asm/ftrace.h> |
35 | ||
0706f1c4 | 36 | #include "trace_output.h" |
bac429f0 | 37 | #include "trace_stat.h" |
16444a8a | 38 | |
6912896e SR |
39 | #define FTRACE_WARN_ON(cond) \ |
40 | do { \ | |
41 | if (WARN_ON(cond)) \ | |
42 | ftrace_kill(); \ | |
43 | } while (0) | |
44 | ||
45 | #define FTRACE_WARN_ON_ONCE(cond) \ | |
46 | do { \ | |
47 | if (WARN_ON_ONCE(cond)) \ | |
48 | ftrace_kill(); \ | |
49 | } while (0) | |
50 | ||
8fc0c701 SR |
51 | /* hash bits for specific function selection */ |
52 | #define FTRACE_HASH_BITS 7 | |
53 | #define FTRACE_FUNC_HASHSIZE (1 << FTRACE_HASH_BITS) | |
54 | ||
4eebcc81 SR |
55 | /* ftrace_enabled is a method to turn ftrace on or off */ |
56 | int ftrace_enabled __read_mostly; | |
d61f82d0 | 57 | static int last_ftrace_enabled; |
b0fc494f | 58 | |
60a7ecf4 SR |
59 | /* Quick disabling of function tracer. */ |
60 | int function_trace_stop; | |
61 | ||
4eebcc81 SR |
62 | /* |
63 | * ftrace_disabled is set when an anomaly is discovered. | |
64 | * ftrace_disabled is much stronger than ftrace_enabled. | |
65 | */ | |
66 | static int ftrace_disabled __read_mostly; | |
67 | ||
52baf119 | 68 | static DEFINE_MUTEX(ftrace_lock); |
b0fc494f | 69 | |
16444a8a ACM |
70 | static struct ftrace_ops ftrace_list_end __read_mostly = |
71 | { | |
fb9fb015 | 72 | .func = ftrace_stub, |
16444a8a ACM |
73 | }; |
74 | ||
75 | static struct ftrace_ops *ftrace_list __read_mostly = &ftrace_list_end; | |
76 | ftrace_func_t ftrace_trace_function __read_mostly = ftrace_stub; | |
60a7ecf4 | 77 | ftrace_func_t __ftrace_trace_function __read_mostly = ftrace_stub; |
df4fc315 | 78 | ftrace_func_t ftrace_pid_function __read_mostly = ftrace_stub; |
16444a8a | 79 | |
f2252935 | 80 | static void ftrace_list_func(unsigned long ip, unsigned long parent_ip) |
16444a8a ACM |
81 | { |
82 | struct ftrace_ops *op = ftrace_list; | |
83 | ||
84 | /* in case someone actually ports this to alpha! */ | |
85 | read_barrier_depends(); | |
86 | ||
87 | while (op != &ftrace_list_end) { | |
88 | /* silly alpha */ | |
89 | read_barrier_depends(); | |
90 | op->func(ip, parent_ip); | |
91 | op = op->next; | |
92 | }; | |
93 | } | |
94 | ||
df4fc315 SR |
95 | static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip) |
96 | { | |
0ef8cde5 | 97 | if (!test_tsk_trace_trace(current)) |
df4fc315 SR |
98 | return; |
99 | ||
100 | ftrace_pid_function(ip, parent_ip); | |
101 | } | |
102 | ||
103 | static void set_ftrace_pid_function(ftrace_func_t func) | |
104 | { | |
105 | /* do not set ftrace_pid_function to itself! */ | |
106 | if (func != ftrace_pid_func) | |
107 | ftrace_pid_function = func; | |
108 | } | |
109 | ||
16444a8a | 110 | /** |
3d083395 | 111 | * clear_ftrace_function - reset the ftrace function |
16444a8a | 112 | * |
3d083395 SR |
113 | * This NULLs the ftrace function and in essence stops |
114 | * tracing. There may be lag | |
16444a8a | 115 | */ |
3d083395 | 116 | void clear_ftrace_function(void) |
16444a8a | 117 | { |
3d083395 | 118 | ftrace_trace_function = ftrace_stub; |
60a7ecf4 | 119 | __ftrace_trace_function = ftrace_stub; |
df4fc315 | 120 | ftrace_pid_function = ftrace_stub; |
3d083395 SR |
121 | } |
122 | ||
60a7ecf4 SR |
123 | #ifndef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST |
124 | /* | |
125 | * For those archs that do not test ftrace_trace_stop in their | |
126 | * mcount call site, we need to do it from C. | |
127 | */ | |
128 | static void ftrace_test_stop_func(unsigned long ip, unsigned long parent_ip) | |
129 | { | |
130 | if (function_trace_stop) | |
131 | return; | |
132 | ||
133 | __ftrace_trace_function(ip, parent_ip); | |
134 | } | |
135 | #endif | |
136 | ||
e309b41d | 137 | static int __register_ftrace_function(struct ftrace_ops *ops) |
3d083395 | 138 | { |
16444a8a ACM |
139 | ops->next = ftrace_list; |
140 | /* | |
141 | * We are entering ops into the ftrace_list but another | |
142 | * CPU might be walking that list. We need to make sure | |
143 | * the ops->next pointer is valid before another CPU sees | |
144 | * the ops pointer included into the ftrace_list. | |
145 | */ | |
146 | smp_wmb(); | |
147 | ftrace_list = ops; | |
3d083395 | 148 | |
b0fc494f | 149 | if (ftrace_enabled) { |
df4fc315 SR |
150 | ftrace_func_t func; |
151 | ||
152 | if (ops->next == &ftrace_list_end) | |
153 | func = ops->func; | |
154 | else | |
155 | func = ftrace_list_func; | |
156 | ||
978f3a45 | 157 | if (ftrace_pid_trace) { |
df4fc315 SR |
158 | set_ftrace_pid_function(func); |
159 | func = ftrace_pid_func; | |
160 | } | |
161 | ||
b0fc494f SR |
162 | /* |
163 | * For one func, simply call it directly. | |
164 | * For more than one func, call the chain. | |
165 | */ | |
60a7ecf4 | 166 | #ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST |
df4fc315 | 167 | ftrace_trace_function = func; |
60a7ecf4 | 168 | #else |
df4fc315 | 169 | __ftrace_trace_function = func; |
60a7ecf4 SR |
170 | ftrace_trace_function = ftrace_test_stop_func; |
171 | #endif | |
b0fc494f | 172 | } |
3d083395 | 173 | |
16444a8a ACM |
174 | return 0; |
175 | } | |
176 | ||
e309b41d | 177 | static int __unregister_ftrace_function(struct ftrace_ops *ops) |
16444a8a | 178 | { |
16444a8a | 179 | struct ftrace_ops **p; |
16444a8a ACM |
180 | |
181 | /* | |
3d083395 SR |
182 | * If we are removing the last function, then simply point |
183 | * to the ftrace_stub. | |
16444a8a ACM |
184 | */ |
185 | if (ftrace_list == ops && ops->next == &ftrace_list_end) { | |
186 | ftrace_trace_function = ftrace_stub; | |
187 | ftrace_list = &ftrace_list_end; | |
e6ea44e9 | 188 | return 0; |
16444a8a ACM |
189 | } |
190 | ||
191 | for (p = &ftrace_list; *p != &ftrace_list_end; p = &(*p)->next) | |
192 | if (*p == ops) | |
193 | break; | |
194 | ||
e6ea44e9 SR |
195 | if (*p != ops) |
196 | return -1; | |
16444a8a ACM |
197 | |
198 | *p = (*p)->next; | |
199 | ||
b0fc494f SR |
200 | if (ftrace_enabled) { |
201 | /* If we only have one func left, then call that directly */ | |
df4fc315 SR |
202 | if (ftrace_list->next == &ftrace_list_end) { |
203 | ftrace_func_t func = ftrace_list->func; | |
204 | ||
978f3a45 | 205 | if (ftrace_pid_trace) { |
df4fc315 SR |
206 | set_ftrace_pid_function(func); |
207 | func = ftrace_pid_func; | |
208 | } | |
209 | #ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST | |
210 | ftrace_trace_function = func; | |
211 | #else | |
212 | __ftrace_trace_function = func; | |
213 | #endif | |
214 | } | |
b0fc494f | 215 | } |
16444a8a | 216 | |
e6ea44e9 | 217 | return 0; |
3d083395 SR |
218 | } |
219 | ||
df4fc315 SR |
220 | static void ftrace_update_pid_func(void) |
221 | { | |
222 | ftrace_func_t func; | |
223 | ||
df4fc315 | 224 | if (ftrace_trace_function == ftrace_stub) |
10dd3ebe | 225 | return; |
df4fc315 SR |
226 | |
227 | func = ftrace_trace_function; | |
228 | ||
978f3a45 | 229 | if (ftrace_pid_trace) { |
df4fc315 SR |
230 | set_ftrace_pid_function(func); |
231 | func = ftrace_pid_func; | |
232 | } else { | |
66eafebc LW |
233 | if (func == ftrace_pid_func) |
234 | func = ftrace_pid_function; | |
df4fc315 SR |
235 | } |
236 | ||
237 | #ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST | |
238 | ftrace_trace_function = func; | |
239 | #else | |
240 | __ftrace_trace_function = func; | |
241 | #endif | |
df4fc315 SR |
242 | } |
243 | ||
493762fc SR |
244 | #ifdef CONFIG_FUNCTION_PROFILER |
245 | struct ftrace_profile { | |
246 | struct hlist_node node; | |
247 | unsigned long ip; | |
248 | unsigned long counter; | |
0706f1c4 SR |
249 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
250 | unsigned long long time; | |
251 | #endif | |
8fc0c701 SR |
252 | }; |
253 | ||
493762fc SR |
254 | struct ftrace_profile_page { |
255 | struct ftrace_profile_page *next; | |
256 | unsigned long index; | |
257 | struct ftrace_profile records[]; | |
d61f82d0 SR |
258 | }; |
259 | ||
cafb168a SR |
260 | struct ftrace_profile_stat { |
261 | atomic_t disabled; | |
262 | struct hlist_head *hash; | |
263 | struct ftrace_profile_page *pages; | |
264 | struct ftrace_profile_page *start; | |
265 | struct tracer_stat stat; | |
266 | }; | |
267 | ||
493762fc SR |
268 | #define PROFILE_RECORDS_SIZE \ |
269 | (PAGE_SIZE - offsetof(struct ftrace_profile_page, records)) | |
5072c59f | 270 | |
493762fc SR |
271 | #define PROFILES_PER_PAGE \ |
272 | (PROFILE_RECORDS_SIZE / sizeof(struct ftrace_profile)) | |
3d083395 | 273 | |
fb9fb015 SR |
274 | static int ftrace_profile_bits __read_mostly; |
275 | static int ftrace_profile_enabled __read_mostly; | |
276 | ||
277 | /* ftrace_profile_lock - synchronize the enable and disable of the profiler */ | |
bac429f0 SR |
278 | static DEFINE_MUTEX(ftrace_profile_lock); |
279 | ||
cafb168a | 280 | static DEFINE_PER_CPU(struct ftrace_profile_stat, ftrace_profile_stats); |
493762fc SR |
281 | |
282 | #define FTRACE_PROFILE_HASH_SIZE 1024 /* must be power of 2 */ | |
283 | ||
bac429f0 SR |
284 | static void * |
285 | function_stat_next(void *v, int idx) | |
286 | { | |
493762fc SR |
287 | struct ftrace_profile *rec = v; |
288 | struct ftrace_profile_page *pg; | |
bac429f0 | 289 | |
493762fc | 290 | pg = (struct ftrace_profile_page *)((unsigned long)rec & PAGE_MASK); |
bac429f0 SR |
291 | |
292 | again: | |
293 | rec++; | |
294 | if ((void *)rec >= (void *)&pg->records[pg->index]) { | |
295 | pg = pg->next; | |
296 | if (!pg) | |
297 | return NULL; | |
298 | rec = &pg->records[0]; | |
493762fc SR |
299 | if (!rec->counter) |
300 | goto again; | |
bac429f0 SR |
301 | } |
302 | ||
bac429f0 SR |
303 | return rec; |
304 | } | |
305 | ||
306 | static void *function_stat_start(struct tracer_stat *trace) | |
307 | { | |
cafb168a SR |
308 | struct ftrace_profile_stat *stat = |
309 | container_of(trace, struct ftrace_profile_stat, stat); | |
310 | ||
311 | if (!stat || !stat->start) | |
312 | return NULL; | |
313 | ||
314 | return function_stat_next(&stat->start->records[0], 0); | |
bac429f0 SR |
315 | } |
316 | ||
0706f1c4 SR |
317 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
318 | /* function graph compares on total time */ | |
319 | static int function_stat_cmp(void *p1, void *p2) | |
320 | { | |
321 | struct ftrace_profile *a = p1; | |
322 | struct ftrace_profile *b = p2; | |
323 | ||
324 | if (a->time < b->time) | |
325 | return -1; | |
326 | if (a->time > b->time) | |
327 | return 1; | |
328 | else | |
329 | return 0; | |
330 | } | |
331 | #else | |
332 | /* not function graph compares against hits */ | |
bac429f0 SR |
333 | static int function_stat_cmp(void *p1, void *p2) |
334 | { | |
493762fc SR |
335 | struct ftrace_profile *a = p1; |
336 | struct ftrace_profile *b = p2; | |
bac429f0 SR |
337 | |
338 | if (a->counter < b->counter) | |
339 | return -1; | |
340 | if (a->counter > b->counter) | |
341 | return 1; | |
342 | else | |
343 | return 0; | |
344 | } | |
0706f1c4 | 345 | #endif |
bac429f0 SR |
346 | |
347 | static int function_stat_headers(struct seq_file *m) | |
348 | { | |
0706f1c4 | 349 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
34886c8b SR |
350 | seq_printf(m, " Function " |
351 | "Hit Time Avg\n" | |
352 | " -------- " | |
353 | "--- ---- ---\n"); | |
0706f1c4 | 354 | #else |
bac429f0 SR |
355 | seq_printf(m, " Function Hit\n" |
356 | " -------- ---\n"); | |
0706f1c4 | 357 | #endif |
bac429f0 SR |
358 | return 0; |
359 | } | |
360 | ||
361 | static int function_stat_show(struct seq_file *m, void *v) | |
362 | { | |
493762fc | 363 | struct ftrace_profile *rec = v; |
bac429f0 | 364 | char str[KSYM_SYMBOL_LEN]; |
0706f1c4 | 365 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
0706f1c4 | 366 | static DEFINE_MUTEX(mutex); |
34886c8b SR |
367 | static struct trace_seq s; |
368 | unsigned long long avg; | |
0706f1c4 | 369 | #endif |
bac429f0 SR |
370 | |
371 | kallsyms_lookup(rec->ip, NULL, NULL, NULL, str); | |
0706f1c4 SR |
372 | seq_printf(m, " %-30.30s %10lu", str, rec->counter); |
373 | ||
374 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
375 | seq_printf(m, " "); | |
34886c8b SR |
376 | avg = rec->time; |
377 | do_div(avg, rec->counter); | |
378 | ||
379 | mutex_lock(&mutex); | |
380 | trace_seq_init(&s); | |
381 | trace_print_graph_duration(rec->time, &s); | |
382 | trace_seq_puts(&s, " "); | |
383 | trace_print_graph_duration(avg, &s); | |
0706f1c4 SR |
384 | trace_print_seq(m, &s); |
385 | mutex_unlock(&mutex); | |
386 | #endif | |
387 | seq_putc(m, '\n'); | |
bac429f0 | 388 | |
bac429f0 SR |
389 | return 0; |
390 | } | |
391 | ||
cafb168a | 392 | static void ftrace_profile_reset(struct ftrace_profile_stat *stat) |
bac429f0 | 393 | { |
493762fc | 394 | struct ftrace_profile_page *pg; |
bac429f0 | 395 | |
cafb168a | 396 | pg = stat->pages = stat->start; |
bac429f0 | 397 | |
493762fc SR |
398 | while (pg) { |
399 | memset(pg->records, 0, PROFILE_RECORDS_SIZE); | |
400 | pg->index = 0; | |
401 | pg = pg->next; | |
bac429f0 SR |
402 | } |
403 | ||
cafb168a | 404 | memset(stat->hash, 0, |
493762fc SR |
405 | FTRACE_PROFILE_HASH_SIZE * sizeof(struct hlist_head)); |
406 | } | |
bac429f0 | 407 | |
cafb168a | 408 | int ftrace_profile_pages_init(struct ftrace_profile_stat *stat) |
493762fc SR |
409 | { |
410 | struct ftrace_profile_page *pg; | |
318e0a73 SR |
411 | int functions; |
412 | int pages; | |
493762fc | 413 | int i; |
bac429f0 | 414 | |
493762fc | 415 | /* If we already allocated, do nothing */ |
cafb168a | 416 | if (stat->pages) |
493762fc | 417 | return 0; |
bac429f0 | 418 | |
cafb168a SR |
419 | stat->pages = (void *)get_zeroed_page(GFP_KERNEL); |
420 | if (!stat->pages) | |
493762fc | 421 | return -ENOMEM; |
bac429f0 | 422 | |
318e0a73 SR |
423 | #ifdef CONFIG_DYNAMIC_FTRACE |
424 | functions = ftrace_update_tot_cnt; | |
425 | #else | |
426 | /* | |
427 | * We do not know the number of functions that exist because | |
428 | * dynamic tracing is what counts them. With past experience | |
429 | * we have around 20K functions. That should be more than enough. | |
430 | * It is highly unlikely we will execute every function in | |
431 | * the kernel. | |
432 | */ | |
433 | functions = 20000; | |
434 | #endif | |
435 | ||
cafb168a | 436 | pg = stat->start = stat->pages; |
bac429f0 | 437 | |
318e0a73 SR |
438 | pages = DIV_ROUND_UP(functions, PROFILES_PER_PAGE); |
439 | ||
440 | for (i = 0; i < pages; i++) { | |
493762fc | 441 | pg->next = (void *)get_zeroed_page(GFP_KERNEL); |
493762fc | 442 | if (!pg->next) |
318e0a73 | 443 | goto out_free; |
493762fc SR |
444 | pg = pg->next; |
445 | } | |
446 | ||
447 | return 0; | |
318e0a73 SR |
448 | |
449 | out_free: | |
450 | pg = stat->start; | |
451 | while (pg) { | |
452 | unsigned long tmp = (unsigned long)pg; | |
453 | ||
454 | pg = pg->next; | |
455 | free_page(tmp); | |
456 | } | |
457 | ||
458 | free_page((unsigned long)stat->pages); | |
459 | stat->pages = NULL; | |
460 | stat->start = NULL; | |
461 | ||
462 | return -ENOMEM; | |
bac429f0 SR |
463 | } |
464 | ||
cafb168a | 465 | static int ftrace_profile_init_cpu(int cpu) |
bac429f0 | 466 | { |
cafb168a | 467 | struct ftrace_profile_stat *stat; |
493762fc | 468 | int size; |
bac429f0 | 469 | |
cafb168a SR |
470 | stat = &per_cpu(ftrace_profile_stats, cpu); |
471 | ||
472 | if (stat->hash) { | |
493762fc | 473 | /* If the profile is already created, simply reset it */ |
cafb168a | 474 | ftrace_profile_reset(stat); |
493762fc SR |
475 | return 0; |
476 | } | |
bac429f0 | 477 | |
493762fc SR |
478 | /* |
479 | * We are profiling all functions, but usually only a few thousand | |
480 | * functions are hit. We'll make a hash of 1024 items. | |
481 | */ | |
482 | size = FTRACE_PROFILE_HASH_SIZE; | |
bac429f0 | 483 | |
cafb168a | 484 | stat->hash = kzalloc(sizeof(struct hlist_head) * size, GFP_KERNEL); |
493762fc | 485 | |
cafb168a | 486 | if (!stat->hash) |
493762fc SR |
487 | return -ENOMEM; |
488 | ||
cafb168a SR |
489 | if (!ftrace_profile_bits) { |
490 | size--; | |
493762fc | 491 | |
cafb168a SR |
492 | for (; size; size >>= 1) |
493 | ftrace_profile_bits++; | |
494 | } | |
493762fc | 495 | |
318e0a73 | 496 | /* Preallocate the function profiling pages */ |
cafb168a SR |
497 | if (ftrace_profile_pages_init(stat) < 0) { |
498 | kfree(stat->hash); | |
499 | stat->hash = NULL; | |
493762fc SR |
500 | return -ENOMEM; |
501 | } | |
502 | ||
503 | return 0; | |
bac429f0 SR |
504 | } |
505 | ||
cafb168a SR |
506 | static int ftrace_profile_init(void) |
507 | { | |
508 | int cpu; | |
509 | int ret = 0; | |
510 | ||
511 | for_each_online_cpu(cpu) { | |
512 | ret = ftrace_profile_init_cpu(cpu); | |
513 | if (ret) | |
514 | break; | |
515 | } | |
516 | ||
517 | return ret; | |
518 | } | |
519 | ||
493762fc | 520 | /* interrupts must be disabled */ |
cafb168a SR |
521 | static struct ftrace_profile * |
522 | ftrace_find_profiled_func(struct ftrace_profile_stat *stat, unsigned long ip) | |
bac429f0 | 523 | { |
493762fc | 524 | struct ftrace_profile *rec; |
bac429f0 SR |
525 | struct hlist_head *hhd; |
526 | struct hlist_node *n; | |
bac429f0 SR |
527 | unsigned long key; |
528 | ||
bac429f0 | 529 | key = hash_long(ip, ftrace_profile_bits); |
cafb168a | 530 | hhd = &stat->hash[key]; |
bac429f0 SR |
531 | |
532 | if (hlist_empty(hhd)) | |
533 | return NULL; | |
534 | ||
bac429f0 SR |
535 | hlist_for_each_entry_rcu(rec, n, hhd, node) { |
536 | if (rec->ip == ip) | |
493762fc SR |
537 | return rec; |
538 | } | |
539 | ||
540 | return NULL; | |
541 | } | |
542 | ||
cafb168a SR |
543 | static void ftrace_add_profile(struct ftrace_profile_stat *stat, |
544 | struct ftrace_profile *rec) | |
493762fc SR |
545 | { |
546 | unsigned long key; | |
547 | ||
548 | key = hash_long(rec->ip, ftrace_profile_bits); | |
cafb168a | 549 | hlist_add_head_rcu(&rec->node, &stat->hash[key]); |
493762fc SR |
550 | } |
551 | ||
318e0a73 SR |
552 | /* |
553 | * The memory is already allocated, this simply finds a new record to use. | |
554 | */ | |
493762fc | 555 | static struct ftrace_profile * |
318e0a73 | 556 | ftrace_profile_alloc(struct ftrace_profile_stat *stat, unsigned long ip) |
493762fc SR |
557 | { |
558 | struct ftrace_profile *rec = NULL; | |
559 | ||
318e0a73 | 560 | /* prevent recursion (from NMIs) */ |
cafb168a | 561 | if (atomic_inc_return(&stat->disabled) != 1) |
493762fc SR |
562 | goto out; |
563 | ||
493762fc | 564 | /* |
318e0a73 SR |
565 | * Try to find the function again since an NMI |
566 | * could have added it | |
493762fc | 567 | */ |
cafb168a | 568 | rec = ftrace_find_profiled_func(stat, ip); |
493762fc | 569 | if (rec) |
cafb168a | 570 | goto out; |
493762fc | 571 | |
cafb168a SR |
572 | if (stat->pages->index == PROFILES_PER_PAGE) { |
573 | if (!stat->pages->next) | |
574 | goto out; | |
575 | stat->pages = stat->pages->next; | |
bac429f0 | 576 | } |
493762fc | 577 | |
cafb168a | 578 | rec = &stat->pages->records[stat->pages->index++]; |
493762fc | 579 | rec->ip = ip; |
cafb168a | 580 | ftrace_add_profile(stat, rec); |
493762fc | 581 | |
bac429f0 | 582 | out: |
cafb168a | 583 | atomic_dec(&stat->disabled); |
bac429f0 SR |
584 | |
585 | return rec; | |
586 | } | |
587 | ||
588 | static void | |
589 | function_profile_call(unsigned long ip, unsigned long parent_ip) | |
590 | { | |
cafb168a | 591 | struct ftrace_profile_stat *stat; |
493762fc | 592 | struct ftrace_profile *rec; |
bac429f0 SR |
593 | unsigned long flags; |
594 | ||
595 | if (!ftrace_profile_enabled) | |
596 | return; | |
597 | ||
598 | local_irq_save(flags); | |
cafb168a SR |
599 | |
600 | stat = &__get_cpu_var(ftrace_profile_stats); | |
601 | if (!stat->hash) | |
602 | goto out; | |
603 | ||
604 | rec = ftrace_find_profiled_func(stat, ip); | |
493762fc | 605 | if (!rec) { |
318e0a73 | 606 | rec = ftrace_profile_alloc(stat, ip); |
493762fc SR |
607 | if (!rec) |
608 | goto out; | |
609 | } | |
bac429f0 SR |
610 | |
611 | rec->counter++; | |
612 | out: | |
613 | local_irq_restore(flags); | |
614 | } | |
615 | ||
0706f1c4 SR |
616 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
617 | static int profile_graph_entry(struct ftrace_graph_ent *trace) | |
618 | { | |
619 | function_profile_call(trace->func, 0); | |
620 | return 1; | |
621 | } | |
622 | ||
623 | static void profile_graph_return(struct ftrace_graph_ret *trace) | |
624 | { | |
cafb168a | 625 | struct ftrace_profile_stat *stat; |
a2a16d6a | 626 | unsigned long long calltime; |
0706f1c4 | 627 | struct ftrace_profile *rec; |
cafb168a | 628 | unsigned long flags; |
0706f1c4 SR |
629 | |
630 | local_irq_save(flags); | |
cafb168a SR |
631 | stat = &__get_cpu_var(ftrace_profile_stats); |
632 | if (!stat->hash) | |
633 | goto out; | |
634 | ||
a2a16d6a SR |
635 | calltime = trace->rettime - trace->calltime; |
636 | ||
637 | if (!(trace_flags & TRACE_ITER_GRAPH_TIME)) { | |
638 | int index; | |
639 | ||
640 | index = trace->depth; | |
641 | ||
642 | /* Append this call time to the parent time to subtract */ | |
643 | if (index) | |
644 | current->ret_stack[index - 1].subtime += calltime; | |
645 | ||
646 | if (current->ret_stack[index].subtime < calltime) | |
647 | calltime -= current->ret_stack[index].subtime; | |
648 | else | |
649 | calltime = 0; | |
650 | } | |
651 | ||
cafb168a | 652 | rec = ftrace_find_profiled_func(stat, trace->func); |
0706f1c4 | 653 | if (rec) |
a2a16d6a SR |
654 | rec->time += calltime; |
655 | ||
cafb168a | 656 | out: |
0706f1c4 SR |
657 | local_irq_restore(flags); |
658 | } | |
659 | ||
660 | static int register_ftrace_profiler(void) | |
661 | { | |
662 | return register_ftrace_graph(&profile_graph_return, | |
663 | &profile_graph_entry); | |
664 | } | |
665 | ||
666 | static void unregister_ftrace_profiler(void) | |
667 | { | |
668 | unregister_ftrace_graph(); | |
669 | } | |
670 | #else | |
bac429f0 SR |
671 | static struct ftrace_ops ftrace_profile_ops __read_mostly = |
672 | { | |
fb9fb015 | 673 | .func = function_profile_call, |
bac429f0 SR |
674 | }; |
675 | ||
0706f1c4 SR |
676 | static int register_ftrace_profiler(void) |
677 | { | |
678 | return register_ftrace_function(&ftrace_profile_ops); | |
679 | } | |
680 | ||
681 | static void unregister_ftrace_profiler(void) | |
682 | { | |
683 | unregister_ftrace_function(&ftrace_profile_ops); | |
684 | } | |
685 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
686 | ||
bac429f0 SR |
687 | static ssize_t |
688 | ftrace_profile_write(struct file *filp, const char __user *ubuf, | |
689 | size_t cnt, loff_t *ppos) | |
690 | { | |
691 | unsigned long val; | |
fb9fb015 | 692 | char buf[64]; /* big enough to hold a number */ |
bac429f0 SR |
693 | int ret; |
694 | ||
bac429f0 SR |
695 | if (cnt >= sizeof(buf)) |
696 | return -EINVAL; | |
697 | ||
698 | if (copy_from_user(&buf, ubuf, cnt)) | |
699 | return -EFAULT; | |
700 | ||
701 | buf[cnt] = 0; | |
702 | ||
703 | ret = strict_strtoul(buf, 10, &val); | |
704 | if (ret < 0) | |
705 | return ret; | |
706 | ||
707 | val = !!val; | |
708 | ||
709 | mutex_lock(&ftrace_profile_lock); | |
710 | if (ftrace_profile_enabled ^ val) { | |
711 | if (val) { | |
493762fc SR |
712 | ret = ftrace_profile_init(); |
713 | if (ret < 0) { | |
714 | cnt = ret; | |
715 | goto out; | |
716 | } | |
717 | ||
0706f1c4 SR |
718 | ret = register_ftrace_profiler(); |
719 | if (ret < 0) { | |
720 | cnt = ret; | |
721 | goto out; | |
722 | } | |
bac429f0 SR |
723 | ftrace_profile_enabled = 1; |
724 | } else { | |
725 | ftrace_profile_enabled = 0; | |
0706f1c4 | 726 | unregister_ftrace_profiler(); |
bac429f0 SR |
727 | } |
728 | } | |
493762fc | 729 | out: |
bac429f0 SR |
730 | mutex_unlock(&ftrace_profile_lock); |
731 | ||
732 | filp->f_pos += cnt; | |
733 | ||
734 | return cnt; | |
735 | } | |
736 | ||
493762fc SR |
737 | static ssize_t |
738 | ftrace_profile_read(struct file *filp, char __user *ubuf, | |
739 | size_t cnt, loff_t *ppos) | |
740 | { | |
fb9fb015 | 741 | char buf[64]; /* big enough to hold a number */ |
493762fc SR |
742 | int r; |
743 | ||
744 | r = sprintf(buf, "%u\n", ftrace_profile_enabled); | |
745 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
746 | } | |
747 | ||
bac429f0 SR |
748 | static const struct file_operations ftrace_profile_fops = { |
749 | .open = tracing_open_generic, | |
750 | .read = ftrace_profile_read, | |
751 | .write = ftrace_profile_write, | |
752 | }; | |
753 | ||
cafb168a SR |
754 | /* used to initialize the real stat files */ |
755 | static struct tracer_stat function_stats __initdata = { | |
fb9fb015 SR |
756 | .name = "functions", |
757 | .stat_start = function_stat_start, | |
758 | .stat_next = function_stat_next, | |
759 | .stat_cmp = function_stat_cmp, | |
760 | .stat_headers = function_stat_headers, | |
761 | .stat_show = function_stat_show | |
cafb168a SR |
762 | }; |
763 | ||
bac429f0 SR |
764 | static void ftrace_profile_debugfs(struct dentry *d_tracer) |
765 | { | |
cafb168a | 766 | struct ftrace_profile_stat *stat; |
bac429f0 | 767 | struct dentry *entry; |
cafb168a | 768 | char *name; |
bac429f0 | 769 | int ret; |
cafb168a SR |
770 | int cpu; |
771 | ||
772 | for_each_possible_cpu(cpu) { | |
773 | stat = &per_cpu(ftrace_profile_stats, cpu); | |
774 | ||
775 | /* allocate enough for function name + cpu number */ | |
776 | name = kmalloc(32, GFP_KERNEL); | |
777 | if (!name) { | |
778 | /* | |
779 | * The files created are permanent, if something happens | |
780 | * we still do not free memory. | |
781 | */ | |
782 | kfree(stat); | |
783 | WARN(1, | |
784 | "Could not allocate stat file for cpu %d\n", | |
785 | cpu); | |
786 | return; | |
787 | } | |
788 | stat->stat = function_stats; | |
789 | snprintf(name, 32, "function%d", cpu); | |
790 | stat->stat.name = name; | |
791 | ret = register_stat_tracer(&stat->stat); | |
792 | if (ret) { | |
793 | WARN(1, | |
794 | "Could not register function stat for cpu %d\n", | |
795 | cpu); | |
796 | kfree(name); | |
797 | return; | |
798 | } | |
bac429f0 SR |
799 | } |
800 | ||
801 | entry = debugfs_create_file("function_profile_enabled", 0644, | |
802 | d_tracer, NULL, &ftrace_profile_fops); | |
803 | if (!entry) | |
804 | pr_warning("Could not create debugfs " | |
805 | "'function_profile_enabled' entry\n"); | |
806 | } | |
807 | ||
bac429f0 | 808 | #else /* CONFIG_FUNCTION_PROFILER */ |
bac429f0 SR |
809 | static void ftrace_profile_debugfs(struct dentry *d_tracer) |
810 | { | |
811 | } | |
bac429f0 SR |
812 | #endif /* CONFIG_FUNCTION_PROFILER */ |
813 | ||
493762fc SR |
814 | /* set when tracing only a pid */ |
815 | struct pid *ftrace_pid_trace; | |
816 | static struct pid * const ftrace_swapper_pid = &init_struct_pid; | |
817 | ||
818 | #ifdef CONFIG_DYNAMIC_FTRACE | |
819 | ||
820 | #ifndef CONFIG_FTRACE_MCOUNT_RECORD | |
821 | # error Dynamic ftrace depends on MCOUNT_RECORD | |
822 | #endif | |
823 | ||
824 | static struct hlist_head ftrace_func_hash[FTRACE_FUNC_HASHSIZE] __read_mostly; | |
825 | ||
826 | struct ftrace_func_probe { | |
827 | struct hlist_node node; | |
828 | struct ftrace_probe_ops *ops; | |
829 | unsigned long flags; | |
830 | unsigned long ip; | |
831 | void *data; | |
832 | struct rcu_head rcu; | |
833 | }; | |
834 | ||
835 | enum { | |
836 | FTRACE_ENABLE_CALLS = (1 << 0), | |
837 | FTRACE_DISABLE_CALLS = (1 << 1), | |
838 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), | |
839 | FTRACE_ENABLE_MCOUNT = (1 << 3), | |
840 | FTRACE_DISABLE_MCOUNT = (1 << 4), | |
841 | FTRACE_START_FUNC_RET = (1 << 5), | |
842 | FTRACE_STOP_FUNC_RET = (1 << 6), | |
843 | }; | |
844 | ||
845 | static int ftrace_filtered; | |
846 | ||
847 | static struct dyn_ftrace *ftrace_new_addrs; | |
848 | ||
849 | static DEFINE_MUTEX(ftrace_regex_lock); | |
850 | ||
851 | struct ftrace_page { | |
852 | struct ftrace_page *next; | |
853 | int index; | |
854 | struct dyn_ftrace records[]; | |
855 | }; | |
856 | ||
857 | #define ENTRIES_PER_PAGE \ | |
858 | ((PAGE_SIZE - sizeof(struct ftrace_page)) / sizeof(struct dyn_ftrace)) | |
859 | ||
860 | /* estimate from running different kernels */ | |
861 | #define NR_TO_INIT 10000 | |
862 | ||
863 | static struct ftrace_page *ftrace_pages_start; | |
864 | static struct ftrace_page *ftrace_pages; | |
865 | ||
866 | static struct dyn_ftrace *ftrace_free_records; | |
867 | ||
868 | /* | |
869 | * This is a double for. Do not use 'break' to break out of the loop, | |
870 | * you must use a goto. | |
871 | */ | |
872 | #define do_for_each_ftrace_rec(pg, rec) \ | |
873 | for (pg = ftrace_pages_start; pg; pg = pg->next) { \ | |
874 | int _____i; \ | |
875 | for (_____i = 0; _____i < pg->index; _____i++) { \ | |
876 | rec = &pg->records[_____i]; | |
877 | ||
878 | #define while_for_each_ftrace_rec() \ | |
879 | } \ | |
880 | } | |
881 | ||
ecea656d | 882 | #ifdef CONFIG_KPROBES |
f17845e5 IM |
883 | |
884 | static int frozen_record_count; | |
885 | ||
ecea656d AS |
886 | static inline void freeze_record(struct dyn_ftrace *rec) |
887 | { | |
888 | if (!(rec->flags & FTRACE_FL_FROZEN)) { | |
889 | rec->flags |= FTRACE_FL_FROZEN; | |
890 | frozen_record_count++; | |
891 | } | |
892 | } | |
893 | ||
894 | static inline void unfreeze_record(struct dyn_ftrace *rec) | |
895 | { | |
896 | if (rec->flags & FTRACE_FL_FROZEN) { | |
897 | rec->flags &= ~FTRACE_FL_FROZEN; | |
898 | frozen_record_count--; | |
899 | } | |
900 | } | |
901 | ||
902 | static inline int record_frozen(struct dyn_ftrace *rec) | |
903 | { | |
904 | return rec->flags & FTRACE_FL_FROZEN; | |
905 | } | |
906 | #else | |
907 | # define freeze_record(rec) ({ 0; }) | |
908 | # define unfreeze_record(rec) ({ 0; }) | |
909 | # define record_frozen(rec) ({ 0; }) | |
910 | #endif /* CONFIG_KPROBES */ | |
911 | ||
e309b41d | 912 | static void ftrace_free_rec(struct dyn_ftrace *rec) |
37ad5084 | 913 | { |
ee000b7f | 914 | rec->freelist = ftrace_free_records; |
37ad5084 SR |
915 | ftrace_free_records = rec; |
916 | rec->flags |= FTRACE_FL_FREE; | |
917 | } | |
918 | ||
fed1939c SR |
919 | void ftrace_release(void *start, unsigned long size) |
920 | { | |
921 | struct dyn_ftrace *rec; | |
922 | struct ftrace_page *pg; | |
923 | unsigned long s = (unsigned long)start; | |
924 | unsigned long e = s + size; | |
fed1939c | 925 | |
00fd61ae | 926 | if (ftrace_disabled || !start) |
fed1939c SR |
927 | return; |
928 | ||
52baf119 | 929 | mutex_lock(&ftrace_lock); |
265c831c | 930 | do_for_each_ftrace_rec(pg, rec) { |
2a4efa42 Z |
931 | if ((rec->ip >= s) && (rec->ip < e)) { |
932 | /* | |
933 | * rec->ip is changed in ftrace_free_rec() | |
934 | * It should not between s and e if record was freed. | |
935 | */ | |
936 | FTRACE_WARN_ON(rec->flags & FTRACE_FL_FREE); | |
265c831c | 937 | ftrace_free_rec(rec); |
2a4efa42 | 938 | } |
265c831c | 939 | } while_for_each_ftrace_rec(); |
52baf119 | 940 | mutex_unlock(&ftrace_lock); |
fed1939c SR |
941 | } |
942 | ||
e309b41d | 943 | static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip) |
3c1720f0 | 944 | { |
37ad5084 SR |
945 | struct dyn_ftrace *rec; |
946 | ||
947 | /* First check for freed records */ | |
948 | if (ftrace_free_records) { | |
949 | rec = ftrace_free_records; | |
950 | ||
37ad5084 | 951 | if (unlikely(!(rec->flags & FTRACE_FL_FREE))) { |
6912896e | 952 | FTRACE_WARN_ON_ONCE(1); |
37ad5084 SR |
953 | ftrace_free_records = NULL; |
954 | return NULL; | |
955 | } | |
956 | ||
ee000b7f | 957 | ftrace_free_records = rec->freelist; |
37ad5084 SR |
958 | memset(rec, 0, sizeof(*rec)); |
959 | return rec; | |
960 | } | |
961 | ||
3c1720f0 | 962 | if (ftrace_pages->index == ENTRIES_PER_PAGE) { |
08f5ac90 SR |
963 | if (!ftrace_pages->next) { |
964 | /* allocate another page */ | |
965 | ftrace_pages->next = | |
966 | (void *)get_zeroed_page(GFP_KERNEL); | |
967 | if (!ftrace_pages->next) | |
968 | return NULL; | |
969 | } | |
3c1720f0 SR |
970 | ftrace_pages = ftrace_pages->next; |
971 | } | |
972 | ||
973 | return &ftrace_pages->records[ftrace_pages->index++]; | |
974 | } | |
975 | ||
08f5ac90 | 976 | static struct dyn_ftrace * |
d61f82d0 | 977 | ftrace_record_ip(unsigned long ip) |
3d083395 | 978 | { |
08f5ac90 | 979 | struct dyn_ftrace *rec; |
3d083395 | 980 | |
f3c7ac40 | 981 | if (ftrace_disabled) |
08f5ac90 | 982 | return NULL; |
3d083395 | 983 | |
08f5ac90 SR |
984 | rec = ftrace_alloc_dyn_node(ip); |
985 | if (!rec) | |
986 | return NULL; | |
3d083395 | 987 | |
08f5ac90 | 988 | rec->ip = ip; |
ee000b7f | 989 | rec->newlist = ftrace_new_addrs; |
e94142a6 | 990 | ftrace_new_addrs = rec; |
3d083395 | 991 | |
08f5ac90 | 992 | return rec; |
3d083395 SR |
993 | } |
994 | ||
b17e8a37 SR |
995 | static void print_ip_ins(const char *fmt, unsigned char *p) |
996 | { | |
997 | int i; | |
998 | ||
999 | printk(KERN_CONT "%s", fmt); | |
1000 | ||
1001 | for (i = 0; i < MCOUNT_INSN_SIZE; i++) | |
1002 | printk(KERN_CONT "%s%02x", i ? ":" : "", p[i]); | |
1003 | } | |
1004 | ||
31e88909 | 1005 | static void ftrace_bug(int failed, unsigned long ip) |
b17e8a37 SR |
1006 | { |
1007 | switch (failed) { | |
1008 | case -EFAULT: | |
1009 | FTRACE_WARN_ON_ONCE(1); | |
1010 | pr_info("ftrace faulted on modifying "); | |
1011 | print_ip_sym(ip); | |
1012 | break; | |
1013 | case -EINVAL: | |
1014 | FTRACE_WARN_ON_ONCE(1); | |
1015 | pr_info("ftrace failed to modify "); | |
1016 | print_ip_sym(ip); | |
b17e8a37 | 1017 | print_ip_ins(" actual: ", (unsigned char *)ip); |
b17e8a37 SR |
1018 | printk(KERN_CONT "\n"); |
1019 | break; | |
1020 | case -EPERM: | |
1021 | FTRACE_WARN_ON_ONCE(1); | |
1022 | pr_info("ftrace faulted on writing "); | |
1023 | print_ip_sym(ip); | |
1024 | break; | |
1025 | default: | |
1026 | FTRACE_WARN_ON_ONCE(1); | |
1027 | pr_info("ftrace faulted on unknown error "); | |
1028 | print_ip_sym(ip); | |
1029 | } | |
1030 | } | |
1031 | ||
3c1720f0 | 1032 | |
0eb96701 | 1033 | static int |
31e88909 | 1034 | __ftrace_replace_code(struct dyn_ftrace *rec, int enable) |
5072c59f | 1035 | { |
e7d3737e | 1036 | unsigned long ftrace_addr; |
6a24a244 | 1037 | unsigned long ip, fl; |
e7d3737e | 1038 | |
f0001207 | 1039 | ftrace_addr = (unsigned long)FTRACE_ADDR; |
5072c59f SR |
1040 | |
1041 | ip = rec->ip; | |
1042 | ||
982c350b SR |
1043 | /* |
1044 | * If this record is not to be traced and | |
1045 | * it is not enabled then do nothing. | |
1046 | * | |
1047 | * If this record is not to be traced and | |
57794a9d | 1048 | * it is enabled then disable it. |
982c350b SR |
1049 | * |
1050 | */ | |
1051 | if (rec->flags & FTRACE_FL_NOTRACE) { | |
1052 | if (rec->flags & FTRACE_FL_ENABLED) | |
1053 | rec->flags &= ~FTRACE_FL_ENABLED; | |
1054 | else | |
1055 | return 0; | |
1056 | ||
1057 | } else if (ftrace_filtered && enable) { | |
5072c59f | 1058 | /* |
982c350b | 1059 | * Filtering is on: |
5072c59f | 1060 | */ |
a4500b84 | 1061 | |
982c350b | 1062 | fl = rec->flags & (FTRACE_FL_FILTER | FTRACE_FL_ENABLED); |
5072c59f | 1063 | |
982c350b SR |
1064 | /* Record is filtered and enabled, do nothing */ |
1065 | if (fl == (FTRACE_FL_FILTER | FTRACE_FL_ENABLED)) | |
0eb96701 | 1066 | return 0; |
5072c59f | 1067 | |
57794a9d | 1068 | /* Record is not filtered or enabled, do nothing */ |
982c350b SR |
1069 | if (!fl) |
1070 | return 0; | |
1071 | ||
1072 | /* Record is not filtered but enabled, disable it */ | |
1073 | if (fl == FTRACE_FL_ENABLED) | |
5072c59f | 1074 | rec->flags &= ~FTRACE_FL_ENABLED; |
982c350b SR |
1075 | else |
1076 | /* Otherwise record is filtered but not enabled, enable it */ | |
5072c59f | 1077 | rec->flags |= FTRACE_FL_ENABLED; |
5072c59f | 1078 | } else { |
982c350b | 1079 | /* Disable or not filtered */ |
5072c59f | 1080 | |
41c52c0d | 1081 | if (enable) { |
982c350b | 1082 | /* if record is enabled, do nothing */ |
5072c59f | 1083 | if (rec->flags & FTRACE_FL_ENABLED) |
0eb96701 | 1084 | return 0; |
982c350b | 1085 | |
5072c59f | 1086 | rec->flags |= FTRACE_FL_ENABLED; |
982c350b | 1087 | |
5072c59f | 1088 | } else { |
982c350b | 1089 | |
57794a9d | 1090 | /* if record is not enabled, do nothing */ |
5072c59f | 1091 | if (!(rec->flags & FTRACE_FL_ENABLED)) |
0eb96701 | 1092 | return 0; |
982c350b | 1093 | |
5072c59f SR |
1094 | rec->flags &= ~FTRACE_FL_ENABLED; |
1095 | } | |
1096 | } | |
1097 | ||
982c350b | 1098 | if (rec->flags & FTRACE_FL_ENABLED) |
e7d3737e | 1099 | return ftrace_make_call(rec, ftrace_addr); |
31e88909 | 1100 | else |
e7d3737e | 1101 | return ftrace_make_nop(NULL, rec, ftrace_addr); |
5072c59f SR |
1102 | } |
1103 | ||
e309b41d | 1104 | static void ftrace_replace_code(int enable) |
3c1720f0 | 1105 | { |
3c1720f0 SR |
1106 | struct dyn_ftrace *rec; |
1107 | struct ftrace_page *pg; | |
6a24a244 | 1108 | int failed; |
3c1720f0 | 1109 | |
265c831c SR |
1110 | do_for_each_ftrace_rec(pg, rec) { |
1111 | /* | |
fa9d13cf Z |
1112 | * Skip over free records, records that have |
1113 | * failed and not converted. | |
265c831c SR |
1114 | */ |
1115 | if (rec->flags & FTRACE_FL_FREE || | |
fa9d13cf | 1116 | rec->flags & FTRACE_FL_FAILED || |
03303549 | 1117 | !(rec->flags & FTRACE_FL_CONVERTED)) |
265c831c SR |
1118 | continue; |
1119 | ||
1120 | /* ignore updates to this record's mcount site */ | |
1121 | if (get_kprobe((void *)rec->ip)) { | |
1122 | freeze_record(rec); | |
1123 | continue; | |
1124 | } else { | |
1125 | unfreeze_record(rec); | |
1126 | } | |
f22f9a89 | 1127 | |
265c831c | 1128 | failed = __ftrace_replace_code(rec, enable); |
fa9d13cf | 1129 | if (failed) { |
265c831c SR |
1130 | rec->flags |= FTRACE_FL_FAILED; |
1131 | if ((system_state == SYSTEM_BOOTING) || | |
1132 | !core_kernel_text(rec->ip)) { | |
1133 | ftrace_free_rec(rec); | |
4377245a | 1134 | } else { |
265c831c | 1135 | ftrace_bug(failed, rec->ip); |
4377245a SR |
1136 | /* Stop processing */ |
1137 | return; | |
1138 | } | |
3c1720f0 | 1139 | } |
265c831c | 1140 | } while_for_each_ftrace_rec(); |
3c1720f0 SR |
1141 | } |
1142 | ||
492a7ea5 | 1143 | static int |
31e88909 | 1144 | ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec) |
3c1720f0 SR |
1145 | { |
1146 | unsigned long ip; | |
593eb8a2 | 1147 | int ret; |
3c1720f0 SR |
1148 | |
1149 | ip = rec->ip; | |
1150 | ||
25aac9dc | 1151 | ret = ftrace_make_nop(mod, rec, MCOUNT_ADDR); |
593eb8a2 | 1152 | if (ret) { |
31e88909 | 1153 | ftrace_bug(ret, ip); |
3c1720f0 | 1154 | rec->flags |= FTRACE_FL_FAILED; |
492a7ea5 | 1155 | return 0; |
37ad5084 | 1156 | } |
492a7ea5 | 1157 | return 1; |
3c1720f0 SR |
1158 | } |
1159 | ||
000ab691 SR |
1160 | /* |
1161 | * archs can override this function if they must do something | |
1162 | * before the modifying code is performed. | |
1163 | */ | |
1164 | int __weak ftrace_arch_code_modify_prepare(void) | |
1165 | { | |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * archs can override this function if they must do something | |
1171 | * after the modifying code is performed. | |
1172 | */ | |
1173 | int __weak ftrace_arch_code_modify_post_process(void) | |
1174 | { | |
1175 | return 0; | |
1176 | } | |
1177 | ||
e309b41d | 1178 | static int __ftrace_modify_code(void *data) |
3d083395 | 1179 | { |
d61f82d0 SR |
1180 | int *command = data; |
1181 | ||
a3583244 | 1182 | if (*command & FTRACE_ENABLE_CALLS) |
d61f82d0 | 1183 | ftrace_replace_code(1); |
a3583244 | 1184 | else if (*command & FTRACE_DISABLE_CALLS) |
d61f82d0 SR |
1185 | ftrace_replace_code(0); |
1186 | ||
1187 | if (*command & FTRACE_UPDATE_TRACE_FUNC) | |
1188 | ftrace_update_ftrace_func(ftrace_trace_function); | |
1189 | ||
5a45cfe1 SR |
1190 | if (*command & FTRACE_START_FUNC_RET) |
1191 | ftrace_enable_ftrace_graph_caller(); | |
1192 | else if (*command & FTRACE_STOP_FUNC_RET) | |
1193 | ftrace_disable_ftrace_graph_caller(); | |
1194 | ||
d61f82d0 | 1195 | return 0; |
3d083395 SR |
1196 | } |
1197 | ||
e309b41d | 1198 | static void ftrace_run_update_code(int command) |
3d083395 | 1199 | { |
000ab691 SR |
1200 | int ret; |
1201 | ||
1202 | ret = ftrace_arch_code_modify_prepare(); | |
1203 | FTRACE_WARN_ON(ret); | |
1204 | if (ret) | |
1205 | return; | |
1206 | ||
784e2d76 | 1207 | stop_machine(__ftrace_modify_code, &command, NULL); |
000ab691 SR |
1208 | |
1209 | ret = ftrace_arch_code_modify_post_process(); | |
1210 | FTRACE_WARN_ON(ret); | |
3d083395 SR |
1211 | } |
1212 | ||
d61f82d0 | 1213 | static ftrace_func_t saved_ftrace_func; |
60a7ecf4 | 1214 | static int ftrace_start_up; |
df4fc315 SR |
1215 | |
1216 | static void ftrace_startup_enable(int command) | |
1217 | { | |
1218 | if (saved_ftrace_func != ftrace_trace_function) { | |
1219 | saved_ftrace_func = ftrace_trace_function; | |
1220 | command |= FTRACE_UPDATE_TRACE_FUNC; | |
1221 | } | |
1222 | ||
1223 | if (!command || !ftrace_enabled) | |
1224 | return; | |
1225 | ||
1226 | ftrace_run_update_code(command); | |
1227 | } | |
d61f82d0 | 1228 | |
5a45cfe1 | 1229 | static void ftrace_startup(int command) |
3d083395 | 1230 | { |
4eebcc81 SR |
1231 | if (unlikely(ftrace_disabled)) |
1232 | return; | |
1233 | ||
60a7ecf4 | 1234 | ftrace_start_up++; |
982c350b | 1235 | command |= FTRACE_ENABLE_CALLS; |
d61f82d0 | 1236 | |
df4fc315 | 1237 | ftrace_startup_enable(command); |
3d083395 SR |
1238 | } |
1239 | ||
5a45cfe1 | 1240 | static void ftrace_shutdown(int command) |
3d083395 | 1241 | { |
4eebcc81 SR |
1242 | if (unlikely(ftrace_disabled)) |
1243 | return; | |
1244 | ||
60a7ecf4 SR |
1245 | ftrace_start_up--; |
1246 | if (!ftrace_start_up) | |
d61f82d0 | 1247 | command |= FTRACE_DISABLE_CALLS; |
3d083395 | 1248 | |
d61f82d0 SR |
1249 | if (saved_ftrace_func != ftrace_trace_function) { |
1250 | saved_ftrace_func = ftrace_trace_function; | |
1251 | command |= FTRACE_UPDATE_TRACE_FUNC; | |
1252 | } | |
3d083395 | 1253 | |
d61f82d0 | 1254 | if (!command || !ftrace_enabled) |
e6ea44e9 | 1255 | return; |
d61f82d0 SR |
1256 | |
1257 | ftrace_run_update_code(command); | |
3d083395 SR |
1258 | } |
1259 | ||
e309b41d | 1260 | static void ftrace_startup_sysctl(void) |
b0fc494f | 1261 | { |
d61f82d0 SR |
1262 | int command = FTRACE_ENABLE_MCOUNT; |
1263 | ||
4eebcc81 SR |
1264 | if (unlikely(ftrace_disabled)) |
1265 | return; | |
1266 | ||
d61f82d0 SR |
1267 | /* Force update next time */ |
1268 | saved_ftrace_func = NULL; | |
60a7ecf4 SR |
1269 | /* ftrace_start_up is true if we want ftrace running */ |
1270 | if (ftrace_start_up) | |
d61f82d0 SR |
1271 | command |= FTRACE_ENABLE_CALLS; |
1272 | ||
1273 | ftrace_run_update_code(command); | |
b0fc494f SR |
1274 | } |
1275 | ||
e309b41d | 1276 | static void ftrace_shutdown_sysctl(void) |
b0fc494f | 1277 | { |
d61f82d0 SR |
1278 | int command = FTRACE_DISABLE_MCOUNT; |
1279 | ||
4eebcc81 SR |
1280 | if (unlikely(ftrace_disabled)) |
1281 | return; | |
1282 | ||
60a7ecf4 SR |
1283 | /* ftrace_start_up is true if ftrace is running */ |
1284 | if (ftrace_start_up) | |
d61f82d0 SR |
1285 | command |= FTRACE_DISABLE_CALLS; |
1286 | ||
1287 | ftrace_run_update_code(command); | |
b0fc494f SR |
1288 | } |
1289 | ||
3d083395 SR |
1290 | static cycle_t ftrace_update_time; |
1291 | static unsigned long ftrace_update_cnt; | |
1292 | unsigned long ftrace_update_tot_cnt; | |
1293 | ||
31e88909 | 1294 | static int ftrace_update_code(struct module *mod) |
3d083395 | 1295 | { |
e94142a6 | 1296 | struct dyn_ftrace *p; |
f22f9a89 | 1297 | cycle_t start, stop; |
3d083395 | 1298 | |
750ed1a4 | 1299 | start = ftrace_now(raw_smp_processor_id()); |
3d083395 SR |
1300 | ftrace_update_cnt = 0; |
1301 | ||
e94142a6 | 1302 | while (ftrace_new_addrs) { |
3d083395 | 1303 | |
08f5ac90 SR |
1304 | /* If something went wrong, bail without enabling anything */ |
1305 | if (unlikely(ftrace_disabled)) | |
1306 | return -1; | |
f22f9a89 | 1307 | |
e94142a6 | 1308 | p = ftrace_new_addrs; |
ee000b7f | 1309 | ftrace_new_addrs = p->newlist; |
e94142a6 | 1310 | p->flags = 0L; |
f22f9a89 | 1311 | |
08f5ac90 | 1312 | /* convert record (i.e, patch mcount-call with NOP) */ |
31e88909 | 1313 | if (ftrace_code_disable(mod, p)) { |
08f5ac90 SR |
1314 | p->flags |= FTRACE_FL_CONVERTED; |
1315 | ftrace_update_cnt++; | |
1316 | } else | |
1317 | ftrace_free_rec(p); | |
3d083395 SR |
1318 | } |
1319 | ||
750ed1a4 | 1320 | stop = ftrace_now(raw_smp_processor_id()); |
3d083395 SR |
1321 | ftrace_update_time = stop - start; |
1322 | ftrace_update_tot_cnt += ftrace_update_cnt; | |
1323 | ||
16444a8a ACM |
1324 | return 0; |
1325 | } | |
1326 | ||
68bf21aa | 1327 | static int __init ftrace_dyn_table_alloc(unsigned long num_to_init) |
3c1720f0 SR |
1328 | { |
1329 | struct ftrace_page *pg; | |
1330 | int cnt; | |
1331 | int i; | |
3c1720f0 SR |
1332 | |
1333 | /* allocate a few pages */ | |
1334 | ftrace_pages_start = (void *)get_zeroed_page(GFP_KERNEL); | |
1335 | if (!ftrace_pages_start) | |
1336 | return -1; | |
1337 | ||
1338 | /* | |
1339 | * Allocate a few more pages. | |
1340 | * | |
1341 | * TODO: have some parser search vmlinux before | |
1342 | * final linking to find all calls to ftrace. | |
1343 | * Then we can: | |
1344 | * a) know how many pages to allocate. | |
1345 | * and/or | |
1346 | * b) set up the table then. | |
1347 | * | |
1348 | * The dynamic code is still necessary for | |
1349 | * modules. | |
1350 | */ | |
1351 | ||
1352 | pg = ftrace_pages = ftrace_pages_start; | |
1353 | ||
68bf21aa | 1354 | cnt = num_to_init / ENTRIES_PER_PAGE; |
08f5ac90 | 1355 | pr_info("ftrace: allocating %ld entries in %d pages\n", |
5821e1b7 | 1356 | num_to_init, cnt + 1); |
3c1720f0 SR |
1357 | |
1358 | for (i = 0; i < cnt; i++) { | |
1359 | pg->next = (void *)get_zeroed_page(GFP_KERNEL); | |
1360 | ||
1361 | /* If we fail, we'll try later anyway */ | |
1362 | if (!pg->next) | |
1363 | break; | |
1364 | ||
1365 | pg = pg->next; | |
1366 | } | |
1367 | ||
1368 | return 0; | |
1369 | } | |
1370 | ||
5072c59f SR |
1371 | enum { |
1372 | FTRACE_ITER_FILTER = (1 << 0), | |
1373 | FTRACE_ITER_CONT = (1 << 1), | |
41c52c0d | 1374 | FTRACE_ITER_NOTRACE = (1 << 2), |
eb9a7bf0 | 1375 | FTRACE_ITER_FAILURES = (1 << 3), |
0c75a3ed | 1376 | FTRACE_ITER_PRINTALL = (1 << 4), |
8fc0c701 | 1377 | FTRACE_ITER_HASH = (1 << 5), |
5072c59f SR |
1378 | }; |
1379 | ||
1380 | #define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */ | |
1381 | ||
1382 | struct ftrace_iterator { | |
5072c59f | 1383 | struct ftrace_page *pg; |
8fc0c701 | 1384 | int hidx; |
431aa3fb | 1385 | int idx; |
5072c59f SR |
1386 | unsigned flags; |
1387 | unsigned char buffer[FTRACE_BUFF_MAX+1]; | |
1388 | unsigned buffer_idx; | |
1389 | unsigned filtered; | |
1390 | }; | |
1391 | ||
8fc0c701 SR |
1392 | static void * |
1393 | t_hash_next(struct seq_file *m, void *v, loff_t *pos) | |
1394 | { | |
1395 | struct ftrace_iterator *iter = m->private; | |
1396 | struct hlist_node *hnd = v; | |
1397 | struct hlist_head *hhd; | |
1398 | ||
1399 | WARN_ON(!(iter->flags & FTRACE_ITER_HASH)); | |
1400 | ||
1401 | (*pos)++; | |
1402 | ||
1403 | retry: | |
1404 | if (iter->hidx >= FTRACE_FUNC_HASHSIZE) | |
1405 | return NULL; | |
1406 | ||
1407 | hhd = &ftrace_func_hash[iter->hidx]; | |
1408 | ||
1409 | if (hlist_empty(hhd)) { | |
1410 | iter->hidx++; | |
1411 | hnd = NULL; | |
1412 | goto retry; | |
1413 | } | |
1414 | ||
1415 | if (!hnd) | |
1416 | hnd = hhd->first; | |
1417 | else { | |
1418 | hnd = hnd->next; | |
1419 | if (!hnd) { | |
1420 | iter->hidx++; | |
1421 | goto retry; | |
1422 | } | |
1423 | } | |
1424 | ||
1425 | return hnd; | |
1426 | } | |
1427 | ||
1428 | static void *t_hash_start(struct seq_file *m, loff_t *pos) | |
1429 | { | |
1430 | struct ftrace_iterator *iter = m->private; | |
1431 | void *p = NULL; | |
1432 | ||
1433 | iter->flags |= FTRACE_ITER_HASH; | |
1434 | ||
1435 | return t_hash_next(m, p, pos); | |
1436 | } | |
1437 | ||
1438 | static int t_hash_show(struct seq_file *m, void *v) | |
1439 | { | |
b6887d79 | 1440 | struct ftrace_func_probe *rec; |
8fc0c701 SR |
1441 | struct hlist_node *hnd = v; |
1442 | char str[KSYM_SYMBOL_LEN]; | |
1443 | ||
b6887d79 | 1444 | rec = hlist_entry(hnd, struct ftrace_func_probe, node); |
8fc0c701 | 1445 | |
809dcf29 SR |
1446 | if (rec->ops->print) |
1447 | return rec->ops->print(m, rec->ip, rec->ops, rec->data); | |
1448 | ||
8fc0c701 SR |
1449 | kallsyms_lookup(rec->ip, NULL, NULL, NULL, str); |
1450 | seq_printf(m, "%s:", str); | |
1451 | ||
1452 | kallsyms_lookup((unsigned long)rec->ops->func, NULL, NULL, NULL, str); | |
1453 | seq_printf(m, "%s", str); | |
1454 | ||
1455 | if (rec->data) | |
1456 | seq_printf(m, ":%p", rec->data); | |
1457 | seq_putc(m, '\n'); | |
1458 | ||
1459 | return 0; | |
1460 | } | |
1461 | ||
e309b41d | 1462 | static void * |
5072c59f SR |
1463 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1464 | { | |
1465 | struct ftrace_iterator *iter = m->private; | |
1466 | struct dyn_ftrace *rec = NULL; | |
1467 | ||
8fc0c701 SR |
1468 | if (iter->flags & FTRACE_ITER_HASH) |
1469 | return t_hash_next(m, v, pos); | |
1470 | ||
5072c59f SR |
1471 | (*pos)++; |
1472 | ||
0c75a3ed SR |
1473 | if (iter->flags & FTRACE_ITER_PRINTALL) |
1474 | return NULL; | |
1475 | ||
5072c59f SR |
1476 | retry: |
1477 | if (iter->idx >= iter->pg->index) { | |
1478 | if (iter->pg->next) { | |
1479 | iter->pg = iter->pg->next; | |
1480 | iter->idx = 0; | |
1481 | goto retry; | |
50cdaf08 LW |
1482 | } else { |
1483 | iter->idx = -1; | |
5072c59f SR |
1484 | } |
1485 | } else { | |
1486 | rec = &iter->pg->records[iter->idx++]; | |
a9fdda33 SR |
1487 | if ((rec->flags & FTRACE_FL_FREE) || |
1488 | ||
1489 | (!(iter->flags & FTRACE_ITER_FAILURES) && | |
eb9a7bf0 AS |
1490 | (rec->flags & FTRACE_FL_FAILED)) || |
1491 | ||
1492 | ((iter->flags & FTRACE_ITER_FAILURES) && | |
a9fdda33 | 1493 | !(rec->flags & FTRACE_FL_FAILED)) || |
eb9a7bf0 | 1494 | |
0183fb1c SR |
1495 | ((iter->flags & FTRACE_ITER_FILTER) && |
1496 | !(rec->flags & FTRACE_FL_FILTER)) || | |
1497 | ||
41c52c0d SR |
1498 | ((iter->flags & FTRACE_ITER_NOTRACE) && |
1499 | !(rec->flags & FTRACE_FL_NOTRACE))) { | |
5072c59f SR |
1500 | rec = NULL; |
1501 | goto retry; | |
1502 | } | |
1503 | } | |
1504 | ||
5072c59f SR |
1505 | return rec; |
1506 | } | |
1507 | ||
1508 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1509 | { | |
1510 | struct ftrace_iterator *iter = m->private; | |
1511 | void *p = NULL; | |
5072c59f | 1512 | |
8fc0c701 | 1513 | mutex_lock(&ftrace_lock); |
0c75a3ed SR |
1514 | /* |
1515 | * For set_ftrace_filter reading, if we have the filter | |
1516 | * off, we can short cut and just print out that all | |
1517 | * functions are enabled. | |
1518 | */ | |
1519 | if (iter->flags & FTRACE_ITER_FILTER && !ftrace_filtered) { | |
1520 | if (*pos > 0) | |
8fc0c701 | 1521 | return t_hash_start(m, pos); |
0c75a3ed SR |
1522 | iter->flags |= FTRACE_ITER_PRINTALL; |
1523 | (*pos)++; | |
1524 | return iter; | |
1525 | } | |
1526 | ||
8fc0c701 SR |
1527 | if (iter->flags & FTRACE_ITER_HASH) |
1528 | return t_hash_start(m, pos); | |
1529 | ||
50cdaf08 LW |
1530 | if (*pos > 0) { |
1531 | if (iter->idx < 0) | |
1532 | return p; | |
1533 | (*pos)--; | |
1534 | iter->idx--; | |
1535 | } | |
5821e1b7 | 1536 | |
50cdaf08 | 1537 | p = t_next(m, p, pos); |
5072c59f | 1538 | |
8fc0c701 SR |
1539 | if (!p) |
1540 | return t_hash_start(m, pos); | |
1541 | ||
5072c59f SR |
1542 | return p; |
1543 | } | |
1544 | ||
1545 | static void t_stop(struct seq_file *m, void *p) | |
1546 | { | |
8fc0c701 | 1547 | mutex_unlock(&ftrace_lock); |
5072c59f SR |
1548 | } |
1549 | ||
1550 | static int t_show(struct seq_file *m, void *v) | |
1551 | { | |
0c75a3ed | 1552 | struct ftrace_iterator *iter = m->private; |
5072c59f SR |
1553 | struct dyn_ftrace *rec = v; |
1554 | char str[KSYM_SYMBOL_LEN]; | |
1555 | ||
8fc0c701 SR |
1556 | if (iter->flags & FTRACE_ITER_HASH) |
1557 | return t_hash_show(m, v); | |
1558 | ||
0c75a3ed SR |
1559 | if (iter->flags & FTRACE_ITER_PRINTALL) { |
1560 | seq_printf(m, "#### all functions enabled ####\n"); | |
1561 | return 0; | |
1562 | } | |
1563 | ||
5072c59f SR |
1564 | if (!rec) |
1565 | return 0; | |
1566 | ||
1567 | kallsyms_lookup(rec->ip, NULL, NULL, NULL, str); | |
1568 | ||
50cdaf08 | 1569 | seq_printf(m, "%s\n", str); |
5072c59f SR |
1570 | |
1571 | return 0; | |
1572 | } | |
1573 | ||
1574 | static struct seq_operations show_ftrace_seq_ops = { | |
1575 | .start = t_start, | |
1576 | .next = t_next, | |
1577 | .stop = t_stop, | |
1578 | .show = t_show, | |
1579 | }; | |
1580 | ||
e309b41d | 1581 | static int |
5072c59f SR |
1582 | ftrace_avail_open(struct inode *inode, struct file *file) |
1583 | { | |
1584 | struct ftrace_iterator *iter; | |
1585 | int ret; | |
1586 | ||
4eebcc81 SR |
1587 | if (unlikely(ftrace_disabled)) |
1588 | return -ENODEV; | |
1589 | ||
5072c59f SR |
1590 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1591 | if (!iter) | |
1592 | return -ENOMEM; | |
1593 | ||
1594 | iter->pg = ftrace_pages_start; | |
5072c59f SR |
1595 | |
1596 | ret = seq_open(file, &show_ftrace_seq_ops); | |
1597 | if (!ret) { | |
1598 | struct seq_file *m = file->private_data; | |
4bf39a94 | 1599 | |
5072c59f | 1600 | m->private = iter; |
4bf39a94 | 1601 | } else { |
5072c59f | 1602 | kfree(iter); |
4bf39a94 | 1603 | } |
5072c59f SR |
1604 | |
1605 | return ret; | |
1606 | } | |
1607 | ||
1608 | int ftrace_avail_release(struct inode *inode, struct file *file) | |
1609 | { | |
1610 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1611 | struct ftrace_iterator *iter = m->private; | |
1612 | ||
1613 | seq_release(inode, file); | |
1614 | kfree(iter); | |
4bf39a94 | 1615 | |
5072c59f SR |
1616 | return 0; |
1617 | } | |
1618 | ||
eb9a7bf0 AS |
1619 | static int |
1620 | ftrace_failures_open(struct inode *inode, struct file *file) | |
1621 | { | |
1622 | int ret; | |
1623 | struct seq_file *m; | |
1624 | struct ftrace_iterator *iter; | |
1625 | ||
1626 | ret = ftrace_avail_open(inode, file); | |
1627 | if (!ret) { | |
1628 | m = (struct seq_file *)file->private_data; | |
1629 | iter = (struct ftrace_iterator *)m->private; | |
1630 | iter->flags = FTRACE_ITER_FAILURES; | |
1631 | } | |
1632 | ||
1633 | return ret; | |
1634 | } | |
1635 | ||
1636 | ||
41c52c0d | 1637 | static void ftrace_filter_reset(int enable) |
5072c59f SR |
1638 | { |
1639 | struct ftrace_page *pg; | |
1640 | struct dyn_ftrace *rec; | |
41c52c0d | 1641 | unsigned long type = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; |
5072c59f | 1642 | |
52baf119 | 1643 | mutex_lock(&ftrace_lock); |
41c52c0d SR |
1644 | if (enable) |
1645 | ftrace_filtered = 0; | |
265c831c SR |
1646 | do_for_each_ftrace_rec(pg, rec) { |
1647 | if (rec->flags & FTRACE_FL_FAILED) | |
1648 | continue; | |
1649 | rec->flags &= ~type; | |
1650 | } while_for_each_ftrace_rec(); | |
52baf119 | 1651 | mutex_unlock(&ftrace_lock); |
5072c59f SR |
1652 | } |
1653 | ||
e309b41d | 1654 | static int |
41c52c0d | 1655 | ftrace_regex_open(struct inode *inode, struct file *file, int enable) |
5072c59f SR |
1656 | { |
1657 | struct ftrace_iterator *iter; | |
1658 | int ret = 0; | |
1659 | ||
4eebcc81 SR |
1660 | if (unlikely(ftrace_disabled)) |
1661 | return -ENODEV; | |
1662 | ||
5072c59f SR |
1663 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1664 | if (!iter) | |
1665 | return -ENOMEM; | |
1666 | ||
41c52c0d | 1667 | mutex_lock(&ftrace_regex_lock); |
5072c59f SR |
1668 | if ((file->f_mode & FMODE_WRITE) && |
1669 | !(file->f_flags & O_APPEND)) | |
41c52c0d | 1670 | ftrace_filter_reset(enable); |
5072c59f SR |
1671 | |
1672 | if (file->f_mode & FMODE_READ) { | |
1673 | iter->pg = ftrace_pages_start; | |
41c52c0d SR |
1674 | iter->flags = enable ? FTRACE_ITER_FILTER : |
1675 | FTRACE_ITER_NOTRACE; | |
5072c59f SR |
1676 | |
1677 | ret = seq_open(file, &show_ftrace_seq_ops); | |
1678 | if (!ret) { | |
1679 | struct seq_file *m = file->private_data; | |
1680 | m->private = iter; | |
1681 | } else | |
1682 | kfree(iter); | |
1683 | } else | |
1684 | file->private_data = iter; | |
41c52c0d | 1685 | mutex_unlock(&ftrace_regex_lock); |
5072c59f SR |
1686 | |
1687 | return ret; | |
1688 | } | |
1689 | ||
41c52c0d SR |
1690 | static int |
1691 | ftrace_filter_open(struct inode *inode, struct file *file) | |
1692 | { | |
1693 | return ftrace_regex_open(inode, file, 1); | |
1694 | } | |
1695 | ||
1696 | static int | |
1697 | ftrace_notrace_open(struct inode *inode, struct file *file) | |
1698 | { | |
1699 | return ftrace_regex_open(inode, file, 0); | |
1700 | } | |
1701 | ||
e309b41d | 1702 | static loff_t |
41c52c0d | 1703 | ftrace_regex_lseek(struct file *file, loff_t offset, int origin) |
5072c59f SR |
1704 | { |
1705 | loff_t ret; | |
1706 | ||
1707 | if (file->f_mode & FMODE_READ) | |
1708 | ret = seq_lseek(file, offset, origin); | |
1709 | else | |
1710 | file->f_pos = ret = 1; | |
1711 | ||
1712 | return ret; | |
1713 | } | |
1714 | ||
1715 | enum { | |
1716 | MATCH_FULL, | |
1717 | MATCH_FRONT_ONLY, | |
1718 | MATCH_MIDDLE_ONLY, | |
1719 | MATCH_END_ONLY, | |
1720 | }; | |
1721 | ||
9f4801e3 SR |
1722 | /* |
1723 | * (static function - no need for kernel doc) | |
1724 | * | |
1725 | * Pass in a buffer containing a glob and this function will | |
1726 | * set search to point to the search part of the buffer and | |
1727 | * return the type of search it is (see enum above). | |
1728 | * This does modify buff. | |
1729 | * | |
1730 | * Returns enum type. | |
1731 | * search returns the pointer to use for comparison. | |
1732 | * not returns 1 if buff started with a '!' | |
1733 | * 0 otherwise. | |
1734 | */ | |
1735 | static int | |
64e7c440 | 1736 | ftrace_setup_glob(char *buff, int len, char **search, int *not) |
5072c59f | 1737 | { |
5072c59f | 1738 | int type = MATCH_FULL; |
9f4801e3 | 1739 | int i; |
ea3a6d6d SR |
1740 | |
1741 | if (buff[0] == '!') { | |
9f4801e3 | 1742 | *not = 1; |
ea3a6d6d SR |
1743 | buff++; |
1744 | len--; | |
9f4801e3 SR |
1745 | } else |
1746 | *not = 0; | |
1747 | ||
1748 | *search = buff; | |
5072c59f SR |
1749 | |
1750 | for (i = 0; i < len; i++) { | |
1751 | if (buff[i] == '*') { | |
1752 | if (!i) { | |
9f4801e3 | 1753 | *search = buff + 1; |
5072c59f | 1754 | type = MATCH_END_ONLY; |
5072c59f | 1755 | } else { |
9f4801e3 | 1756 | if (type == MATCH_END_ONLY) |
5072c59f | 1757 | type = MATCH_MIDDLE_ONLY; |
9f4801e3 | 1758 | else |
5072c59f | 1759 | type = MATCH_FRONT_ONLY; |
5072c59f SR |
1760 | buff[i] = 0; |
1761 | break; | |
1762 | } | |
1763 | } | |
1764 | } | |
1765 | ||
9f4801e3 SR |
1766 | return type; |
1767 | } | |
1768 | ||
64e7c440 | 1769 | static int ftrace_match(char *str, char *regex, int len, int type) |
9f4801e3 | 1770 | { |
9f4801e3 SR |
1771 | int matched = 0; |
1772 | char *ptr; | |
1773 | ||
9f4801e3 SR |
1774 | switch (type) { |
1775 | case MATCH_FULL: | |
1776 | if (strcmp(str, regex) == 0) | |
1777 | matched = 1; | |
1778 | break; | |
1779 | case MATCH_FRONT_ONLY: | |
1780 | if (strncmp(str, regex, len) == 0) | |
1781 | matched = 1; | |
1782 | break; | |
1783 | case MATCH_MIDDLE_ONLY: | |
1784 | if (strstr(str, regex)) | |
1785 | matched = 1; | |
1786 | break; | |
1787 | case MATCH_END_ONLY: | |
1788 | ptr = strstr(str, regex); | |
1789 | if (ptr && (ptr[len] == 0)) | |
1790 | matched = 1; | |
1791 | break; | |
1792 | } | |
1793 | ||
1794 | return matched; | |
1795 | } | |
1796 | ||
64e7c440 SR |
1797 | static int |
1798 | ftrace_match_record(struct dyn_ftrace *rec, char *regex, int len, int type) | |
1799 | { | |
1800 | char str[KSYM_SYMBOL_LEN]; | |
1801 | ||
1802 | kallsyms_lookup(rec->ip, NULL, NULL, NULL, str); | |
1803 | return ftrace_match(str, regex, len, type); | |
1804 | } | |
1805 | ||
9f4801e3 SR |
1806 | static void ftrace_match_records(char *buff, int len, int enable) |
1807 | { | |
6a24a244 | 1808 | unsigned int search_len; |
9f4801e3 SR |
1809 | struct ftrace_page *pg; |
1810 | struct dyn_ftrace *rec; | |
6a24a244 SR |
1811 | unsigned long flag; |
1812 | char *search; | |
9f4801e3 | 1813 | int type; |
9f4801e3 SR |
1814 | int not; |
1815 | ||
6a24a244 | 1816 | flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; |
9f4801e3 SR |
1817 | type = ftrace_setup_glob(buff, len, &search, ¬); |
1818 | ||
1819 | search_len = strlen(search); | |
1820 | ||
52baf119 | 1821 | mutex_lock(&ftrace_lock); |
265c831c | 1822 | do_for_each_ftrace_rec(pg, rec) { |
265c831c SR |
1823 | |
1824 | if (rec->flags & FTRACE_FL_FAILED) | |
1825 | continue; | |
9f4801e3 SR |
1826 | |
1827 | if (ftrace_match_record(rec, search, search_len, type)) { | |
265c831c SR |
1828 | if (not) |
1829 | rec->flags &= ~flag; | |
1830 | else | |
1831 | rec->flags |= flag; | |
1832 | } | |
e68746a2 SR |
1833 | /* |
1834 | * Only enable filtering if we have a function that | |
1835 | * is filtered on. | |
1836 | */ | |
1837 | if (enable && (rec->flags & FTRACE_FL_FILTER)) | |
1838 | ftrace_filtered = 1; | |
265c831c | 1839 | } while_for_each_ftrace_rec(); |
52baf119 | 1840 | mutex_unlock(&ftrace_lock); |
5072c59f SR |
1841 | } |
1842 | ||
64e7c440 SR |
1843 | static int |
1844 | ftrace_match_module_record(struct dyn_ftrace *rec, char *mod, | |
1845 | char *regex, int len, int type) | |
1846 | { | |
1847 | char str[KSYM_SYMBOL_LEN]; | |
1848 | char *modname; | |
1849 | ||
1850 | kallsyms_lookup(rec->ip, NULL, NULL, &modname, str); | |
1851 | ||
1852 | if (!modname || strcmp(modname, mod)) | |
1853 | return 0; | |
1854 | ||
1855 | /* blank search means to match all funcs in the mod */ | |
1856 | if (len) | |
1857 | return ftrace_match(str, regex, len, type); | |
1858 | else | |
1859 | return 1; | |
1860 | } | |
1861 | ||
1862 | static void ftrace_match_module_records(char *buff, char *mod, int enable) | |
1863 | { | |
6a24a244 | 1864 | unsigned search_len = 0; |
64e7c440 SR |
1865 | struct ftrace_page *pg; |
1866 | struct dyn_ftrace *rec; | |
1867 | int type = MATCH_FULL; | |
6a24a244 SR |
1868 | char *search = buff; |
1869 | unsigned long flag; | |
64e7c440 SR |
1870 | int not = 0; |
1871 | ||
6a24a244 SR |
1872 | flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; |
1873 | ||
64e7c440 SR |
1874 | /* blank or '*' mean the same */ |
1875 | if (strcmp(buff, "*") == 0) | |
1876 | buff[0] = 0; | |
1877 | ||
1878 | /* handle the case of 'dont filter this module' */ | |
1879 | if (strcmp(buff, "!") == 0 || strcmp(buff, "!*") == 0) { | |
1880 | buff[0] = 0; | |
1881 | not = 1; | |
1882 | } | |
1883 | ||
1884 | if (strlen(buff)) { | |
1885 | type = ftrace_setup_glob(buff, strlen(buff), &search, ¬); | |
1886 | search_len = strlen(search); | |
1887 | } | |
1888 | ||
52baf119 | 1889 | mutex_lock(&ftrace_lock); |
64e7c440 SR |
1890 | do_for_each_ftrace_rec(pg, rec) { |
1891 | ||
1892 | if (rec->flags & FTRACE_FL_FAILED) | |
1893 | continue; | |
1894 | ||
1895 | if (ftrace_match_module_record(rec, mod, | |
1896 | search, search_len, type)) { | |
1897 | if (not) | |
1898 | rec->flags &= ~flag; | |
1899 | else | |
1900 | rec->flags |= flag; | |
1901 | } | |
e68746a2 SR |
1902 | if (enable && (rec->flags & FTRACE_FL_FILTER)) |
1903 | ftrace_filtered = 1; | |
64e7c440 SR |
1904 | |
1905 | } while_for_each_ftrace_rec(); | |
52baf119 | 1906 | mutex_unlock(&ftrace_lock); |
64e7c440 SR |
1907 | } |
1908 | ||
f6180773 SR |
1909 | /* |
1910 | * We register the module command as a template to show others how | |
1911 | * to register the a command as well. | |
1912 | */ | |
1913 | ||
1914 | static int | |
1915 | ftrace_mod_callback(char *func, char *cmd, char *param, int enable) | |
1916 | { | |
1917 | char *mod; | |
1918 | ||
1919 | /* | |
1920 | * cmd == 'mod' because we only registered this func | |
1921 | * for the 'mod' ftrace_func_command. | |
1922 | * But if you register one func with multiple commands, | |
1923 | * you can tell which command was used by the cmd | |
1924 | * parameter. | |
1925 | */ | |
1926 | ||
1927 | /* we must have a module name */ | |
1928 | if (!param) | |
1929 | return -EINVAL; | |
1930 | ||
1931 | mod = strsep(¶m, ":"); | |
1932 | if (!strlen(mod)) | |
1933 | return -EINVAL; | |
1934 | ||
1935 | ftrace_match_module_records(func, mod, enable); | |
1936 | return 0; | |
1937 | } | |
1938 | ||
1939 | static struct ftrace_func_command ftrace_mod_cmd = { | |
1940 | .name = "mod", | |
1941 | .func = ftrace_mod_callback, | |
1942 | }; | |
1943 | ||
1944 | static int __init ftrace_mod_cmd_init(void) | |
1945 | { | |
1946 | return register_ftrace_command(&ftrace_mod_cmd); | |
1947 | } | |
1948 | device_initcall(ftrace_mod_cmd_init); | |
1949 | ||
59df055f | 1950 | static void |
b6887d79 | 1951 | function_trace_probe_call(unsigned long ip, unsigned long parent_ip) |
59df055f | 1952 | { |
b6887d79 | 1953 | struct ftrace_func_probe *entry; |
59df055f SR |
1954 | struct hlist_head *hhd; |
1955 | struct hlist_node *n; | |
1956 | unsigned long key; | |
1957 | int resched; | |
1958 | ||
1959 | key = hash_long(ip, FTRACE_HASH_BITS); | |
1960 | ||
1961 | hhd = &ftrace_func_hash[key]; | |
1962 | ||
1963 | if (hlist_empty(hhd)) | |
1964 | return; | |
1965 | ||
1966 | /* | |
1967 | * Disable preemption for these calls to prevent a RCU grace | |
1968 | * period. This syncs the hash iteration and freeing of items | |
1969 | * on the hash. rcu_read_lock is too dangerous here. | |
1970 | */ | |
1971 | resched = ftrace_preempt_disable(); | |
1972 | hlist_for_each_entry_rcu(entry, n, hhd, node) { | |
1973 | if (entry->ip == ip) | |
1974 | entry->ops->func(ip, parent_ip, &entry->data); | |
1975 | } | |
1976 | ftrace_preempt_enable(resched); | |
1977 | } | |
1978 | ||
b6887d79 | 1979 | static struct ftrace_ops trace_probe_ops __read_mostly = |
59df055f | 1980 | { |
fb9fb015 | 1981 | .func = function_trace_probe_call, |
59df055f SR |
1982 | }; |
1983 | ||
b6887d79 | 1984 | static int ftrace_probe_registered; |
59df055f | 1985 | |
b6887d79 | 1986 | static void __enable_ftrace_function_probe(void) |
59df055f SR |
1987 | { |
1988 | int i; | |
1989 | ||
b6887d79 | 1990 | if (ftrace_probe_registered) |
59df055f SR |
1991 | return; |
1992 | ||
1993 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { | |
1994 | struct hlist_head *hhd = &ftrace_func_hash[i]; | |
1995 | if (hhd->first) | |
1996 | break; | |
1997 | } | |
1998 | /* Nothing registered? */ | |
1999 | if (i == FTRACE_FUNC_HASHSIZE) | |
2000 | return; | |
2001 | ||
b6887d79 | 2002 | __register_ftrace_function(&trace_probe_ops); |
59df055f | 2003 | ftrace_startup(0); |
b6887d79 | 2004 | ftrace_probe_registered = 1; |
59df055f SR |
2005 | } |
2006 | ||
b6887d79 | 2007 | static void __disable_ftrace_function_probe(void) |
59df055f SR |
2008 | { |
2009 | int i; | |
2010 | ||
b6887d79 | 2011 | if (!ftrace_probe_registered) |
59df055f SR |
2012 | return; |
2013 | ||
2014 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { | |
2015 | struct hlist_head *hhd = &ftrace_func_hash[i]; | |
2016 | if (hhd->first) | |
2017 | return; | |
2018 | } | |
2019 | ||
2020 | /* no more funcs left */ | |
b6887d79 | 2021 | __unregister_ftrace_function(&trace_probe_ops); |
59df055f | 2022 | ftrace_shutdown(0); |
b6887d79 | 2023 | ftrace_probe_registered = 0; |
59df055f SR |
2024 | } |
2025 | ||
2026 | ||
2027 | static void ftrace_free_entry_rcu(struct rcu_head *rhp) | |
2028 | { | |
b6887d79 SR |
2029 | struct ftrace_func_probe *entry = |
2030 | container_of(rhp, struct ftrace_func_probe, rcu); | |
59df055f SR |
2031 | |
2032 | if (entry->ops->free) | |
2033 | entry->ops->free(&entry->data); | |
2034 | kfree(entry); | |
2035 | } | |
2036 | ||
2037 | ||
2038 | int | |
b6887d79 | 2039 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
2040 | void *data) |
2041 | { | |
b6887d79 | 2042 | struct ftrace_func_probe *entry; |
59df055f SR |
2043 | struct ftrace_page *pg; |
2044 | struct dyn_ftrace *rec; | |
59df055f | 2045 | int type, len, not; |
6a24a244 | 2046 | unsigned long key; |
59df055f SR |
2047 | int count = 0; |
2048 | char *search; | |
2049 | ||
2050 | type = ftrace_setup_glob(glob, strlen(glob), &search, ¬); | |
2051 | len = strlen(search); | |
2052 | ||
b6887d79 | 2053 | /* we do not support '!' for function probes */ |
59df055f SR |
2054 | if (WARN_ON(not)) |
2055 | return -EINVAL; | |
2056 | ||
2057 | mutex_lock(&ftrace_lock); | |
2058 | do_for_each_ftrace_rec(pg, rec) { | |
2059 | ||
2060 | if (rec->flags & FTRACE_FL_FAILED) | |
2061 | continue; | |
2062 | ||
2063 | if (!ftrace_match_record(rec, search, len, type)) | |
2064 | continue; | |
2065 | ||
2066 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
2067 | if (!entry) { | |
b6887d79 | 2068 | /* If we did not process any, then return error */ |
59df055f SR |
2069 | if (!count) |
2070 | count = -ENOMEM; | |
2071 | goto out_unlock; | |
2072 | } | |
2073 | ||
2074 | count++; | |
2075 | ||
2076 | entry->data = data; | |
2077 | ||
2078 | /* | |
2079 | * The caller might want to do something special | |
2080 | * for each function we find. We call the callback | |
2081 | * to give the caller an opportunity to do so. | |
2082 | */ | |
2083 | if (ops->callback) { | |
2084 | if (ops->callback(rec->ip, &entry->data) < 0) { | |
2085 | /* caller does not like this func */ | |
2086 | kfree(entry); | |
2087 | continue; | |
2088 | } | |
2089 | } | |
2090 | ||
2091 | entry->ops = ops; | |
2092 | entry->ip = rec->ip; | |
2093 | ||
2094 | key = hash_long(entry->ip, FTRACE_HASH_BITS); | |
2095 | hlist_add_head_rcu(&entry->node, &ftrace_func_hash[key]); | |
2096 | ||
2097 | } while_for_each_ftrace_rec(); | |
b6887d79 | 2098 | __enable_ftrace_function_probe(); |
59df055f SR |
2099 | |
2100 | out_unlock: | |
2101 | mutex_unlock(&ftrace_lock); | |
2102 | ||
2103 | return count; | |
2104 | } | |
2105 | ||
2106 | enum { | |
b6887d79 SR |
2107 | PROBE_TEST_FUNC = 1, |
2108 | PROBE_TEST_DATA = 2 | |
59df055f SR |
2109 | }; |
2110 | ||
2111 | static void | |
b6887d79 | 2112 | __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
2113 | void *data, int flags) |
2114 | { | |
b6887d79 | 2115 | struct ftrace_func_probe *entry; |
59df055f SR |
2116 | struct hlist_node *n, *tmp; |
2117 | char str[KSYM_SYMBOL_LEN]; | |
2118 | int type = MATCH_FULL; | |
2119 | int i, len = 0; | |
2120 | char *search; | |
2121 | ||
2122 | if (glob && (strcmp(glob, "*") || !strlen(glob))) | |
2123 | glob = NULL; | |
2124 | else { | |
2125 | int not; | |
2126 | ||
2127 | type = ftrace_setup_glob(glob, strlen(glob), &search, ¬); | |
2128 | len = strlen(search); | |
2129 | ||
b6887d79 | 2130 | /* we do not support '!' for function probes */ |
59df055f SR |
2131 | if (WARN_ON(not)) |
2132 | return; | |
2133 | } | |
2134 | ||
2135 | mutex_lock(&ftrace_lock); | |
2136 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { | |
2137 | struct hlist_head *hhd = &ftrace_func_hash[i]; | |
2138 | ||
2139 | hlist_for_each_entry_safe(entry, n, tmp, hhd, node) { | |
2140 | ||
2141 | /* break up if statements for readability */ | |
b6887d79 | 2142 | if ((flags & PROBE_TEST_FUNC) && entry->ops != ops) |
59df055f SR |
2143 | continue; |
2144 | ||
b6887d79 | 2145 | if ((flags & PROBE_TEST_DATA) && entry->data != data) |
59df055f SR |
2146 | continue; |
2147 | ||
2148 | /* do this last, since it is the most expensive */ | |
2149 | if (glob) { | |
2150 | kallsyms_lookup(entry->ip, NULL, NULL, | |
2151 | NULL, str); | |
2152 | if (!ftrace_match(str, glob, len, type)) | |
2153 | continue; | |
2154 | } | |
2155 | ||
2156 | hlist_del(&entry->node); | |
2157 | call_rcu(&entry->rcu, ftrace_free_entry_rcu); | |
2158 | } | |
2159 | } | |
b6887d79 | 2160 | __disable_ftrace_function_probe(); |
59df055f SR |
2161 | mutex_unlock(&ftrace_lock); |
2162 | } | |
2163 | ||
2164 | void | |
b6887d79 | 2165 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
59df055f SR |
2166 | void *data) |
2167 | { | |
b6887d79 SR |
2168 | __unregister_ftrace_function_probe(glob, ops, data, |
2169 | PROBE_TEST_FUNC | PROBE_TEST_DATA); | |
59df055f SR |
2170 | } |
2171 | ||
2172 | void | |
b6887d79 | 2173 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops) |
59df055f | 2174 | { |
b6887d79 | 2175 | __unregister_ftrace_function_probe(glob, ops, NULL, PROBE_TEST_FUNC); |
59df055f SR |
2176 | } |
2177 | ||
b6887d79 | 2178 | void unregister_ftrace_function_probe_all(char *glob) |
59df055f | 2179 | { |
b6887d79 | 2180 | __unregister_ftrace_function_probe(glob, NULL, NULL, 0); |
59df055f SR |
2181 | } |
2182 | ||
f6180773 SR |
2183 | static LIST_HEAD(ftrace_commands); |
2184 | static DEFINE_MUTEX(ftrace_cmd_mutex); | |
2185 | ||
2186 | int register_ftrace_command(struct ftrace_func_command *cmd) | |
2187 | { | |
2188 | struct ftrace_func_command *p; | |
2189 | int ret = 0; | |
2190 | ||
2191 | mutex_lock(&ftrace_cmd_mutex); | |
2192 | list_for_each_entry(p, &ftrace_commands, list) { | |
2193 | if (strcmp(cmd->name, p->name) == 0) { | |
2194 | ret = -EBUSY; | |
2195 | goto out_unlock; | |
2196 | } | |
2197 | } | |
2198 | list_add(&cmd->list, &ftrace_commands); | |
2199 | out_unlock: | |
2200 | mutex_unlock(&ftrace_cmd_mutex); | |
2201 | ||
2202 | return ret; | |
2203 | } | |
2204 | ||
2205 | int unregister_ftrace_command(struct ftrace_func_command *cmd) | |
2206 | { | |
2207 | struct ftrace_func_command *p, *n; | |
2208 | int ret = -ENODEV; | |
2209 | ||
2210 | mutex_lock(&ftrace_cmd_mutex); | |
2211 | list_for_each_entry_safe(p, n, &ftrace_commands, list) { | |
2212 | if (strcmp(cmd->name, p->name) == 0) { | |
2213 | ret = 0; | |
2214 | list_del_init(&p->list); | |
2215 | goto out_unlock; | |
2216 | } | |
2217 | } | |
2218 | out_unlock: | |
2219 | mutex_unlock(&ftrace_cmd_mutex); | |
2220 | ||
2221 | return ret; | |
2222 | } | |
2223 | ||
64e7c440 SR |
2224 | static int ftrace_process_regex(char *buff, int len, int enable) |
2225 | { | |
f6180773 | 2226 | char *func, *command, *next = buff; |
6a24a244 | 2227 | struct ftrace_func_command *p; |
f6180773 | 2228 | int ret = -EINVAL; |
64e7c440 SR |
2229 | |
2230 | func = strsep(&next, ":"); | |
2231 | ||
2232 | if (!next) { | |
2233 | ftrace_match_records(func, len, enable); | |
2234 | return 0; | |
2235 | } | |
2236 | ||
f6180773 | 2237 | /* command found */ |
64e7c440 SR |
2238 | |
2239 | command = strsep(&next, ":"); | |
2240 | ||
f6180773 SR |
2241 | mutex_lock(&ftrace_cmd_mutex); |
2242 | list_for_each_entry(p, &ftrace_commands, list) { | |
2243 | if (strcmp(p->name, command) == 0) { | |
2244 | ret = p->func(func, command, next, enable); | |
2245 | goto out_unlock; | |
2246 | } | |
64e7c440 | 2247 | } |
f6180773 SR |
2248 | out_unlock: |
2249 | mutex_unlock(&ftrace_cmd_mutex); | |
64e7c440 | 2250 | |
f6180773 | 2251 | return ret; |
64e7c440 SR |
2252 | } |
2253 | ||
e309b41d | 2254 | static ssize_t |
41c52c0d SR |
2255 | ftrace_regex_write(struct file *file, const char __user *ubuf, |
2256 | size_t cnt, loff_t *ppos, int enable) | |
5072c59f SR |
2257 | { |
2258 | struct ftrace_iterator *iter; | |
2259 | char ch; | |
2260 | size_t read = 0; | |
2261 | ssize_t ret; | |
2262 | ||
2263 | if (!cnt || cnt < 0) | |
2264 | return 0; | |
2265 | ||
41c52c0d | 2266 | mutex_lock(&ftrace_regex_lock); |
5072c59f SR |
2267 | |
2268 | if (file->f_mode & FMODE_READ) { | |
2269 | struct seq_file *m = file->private_data; | |
2270 | iter = m->private; | |
2271 | } else | |
2272 | iter = file->private_data; | |
2273 | ||
2274 | if (!*ppos) { | |
2275 | iter->flags &= ~FTRACE_ITER_CONT; | |
2276 | iter->buffer_idx = 0; | |
2277 | } | |
2278 | ||
2279 | ret = get_user(ch, ubuf++); | |
2280 | if (ret) | |
2281 | goto out; | |
2282 | read++; | |
2283 | cnt--; | |
2284 | ||
2285 | if (!(iter->flags & ~FTRACE_ITER_CONT)) { | |
2286 | /* skip white space */ | |
2287 | while (cnt && isspace(ch)) { | |
2288 | ret = get_user(ch, ubuf++); | |
2289 | if (ret) | |
2290 | goto out; | |
2291 | read++; | |
2292 | cnt--; | |
2293 | } | |
2294 | ||
5072c59f SR |
2295 | if (isspace(ch)) { |
2296 | file->f_pos += read; | |
2297 | ret = read; | |
2298 | goto out; | |
2299 | } | |
2300 | ||
2301 | iter->buffer_idx = 0; | |
2302 | } | |
2303 | ||
2304 | while (cnt && !isspace(ch)) { | |
2305 | if (iter->buffer_idx < FTRACE_BUFF_MAX) | |
2306 | iter->buffer[iter->buffer_idx++] = ch; | |
2307 | else { | |
2308 | ret = -EINVAL; | |
2309 | goto out; | |
2310 | } | |
2311 | ret = get_user(ch, ubuf++); | |
2312 | if (ret) | |
2313 | goto out; | |
2314 | read++; | |
2315 | cnt--; | |
2316 | } | |
2317 | ||
2318 | if (isspace(ch)) { | |
2319 | iter->filtered++; | |
2320 | iter->buffer[iter->buffer_idx] = 0; | |
64e7c440 SR |
2321 | ret = ftrace_process_regex(iter->buffer, |
2322 | iter->buffer_idx, enable); | |
2323 | if (ret) | |
2324 | goto out; | |
5072c59f SR |
2325 | iter->buffer_idx = 0; |
2326 | } else | |
2327 | iter->flags |= FTRACE_ITER_CONT; | |
2328 | ||
2329 | ||
2330 | file->f_pos += read; | |
2331 | ||
2332 | ret = read; | |
2333 | out: | |
41c52c0d | 2334 | mutex_unlock(&ftrace_regex_lock); |
5072c59f SR |
2335 | |
2336 | return ret; | |
2337 | } | |
2338 | ||
41c52c0d SR |
2339 | static ssize_t |
2340 | ftrace_filter_write(struct file *file, const char __user *ubuf, | |
2341 | size_t cnt, loff_t *ppos) | |
2342 | { | |
2343 | return ftrace_regex_write(file, ubuf, cnt, ppos, 1); | |
2344 | } | |
2345 | ||
2346 | static ssize_t | |
2347 | ftrace_notrace_write(struct file *file, const char __user *ubuf, | |
2348 | size_t cnt, loff_t *ppos) | |
2349 | { | |
2350 | return ftrace_regex_write(file, ubuf, cnt, ppos, 0); | |
2351 | } | |
2352 | ||
2353 | static void | |
2354 | ftrace_set_regex(unsigned char *buf, int len, int reset, int enable) | |
2355 | { | |
2356 | if (unlikely(ftrace_disabled)) | |
2357 | return; | |
2358 | ||
2359 | mutex_lock(&ftrace_regex_lock); | |
2360 | if (reset) | |
2361 | ftrace_filter_reset(enable); | |
2362 | if (buf) | |
7f24b31b | 2363 | ftrace_match_records(buf, len, enable); |
41c52c0d SR |
2364 | mutex_unlock(&ftrace_regex_lock); |
2365 | } | |
2366 | ||
77a2b37d SR |
2367 | /** |
2368 | * ftrace_set_filter - set a function to filter on in ftrace | |
2369 | * @buf - the string that holds the function filter text. | |
2370 | * @len - the length of the string. | |
2371 | * @reset - non zero to reset all filters before applying this filter. | |
2372 | * | |
2373 | * Filters denote which functions should be enabled when tracing is enabled. | |
2374 | * If @buf is NULL and reset is set, all functions will be enabled for tracing. | |
2375 | */ | |
e309b41d | 2376 | void ftrace_set_filter(unsigned char *buf, int len, int reset) |
77a2b37d | 2377 | { |
41c52c0d SR |
2378 | ftrace_set_regex(buf, len, reset, 1); |
2379 | } | |
4eebcc81 | 2380 | |
41c52c0d SR |
2381 | /** |
2382 | * ftrace_set_notrace - set a function to not trace in ftrace | |
2383 | * @buf - the string that holds the function notrace text. | |
2384 | * @len - the length of the string. | |
2385 | * @reset - non zero to reset all filters before applying this filter. | |
2386 | * | |
2387 | * Notrace Filters denote which functions should not be enabled when tracing | |
2388 | * is enabled. If @buf is NULL and reset is set, all functions will be enabled | |
2389 | * for tracing. | |
2390 | */ | |
2391 | void ftrace_set_notrace(unsigned char *buf, int len, int reset) | |
2392 | { | |
2393 | ftrace_set_regex(buf, len, reset, 0); | |
77a2b37d SR |
2394 | } |
2395 | ||
e309b41d | 2396 | static int |
41c52c0d | 2397 | ftrace_regex_release(struct inode *inode, struct file *file, int enable) |
5072c59f SR |
2398 | { |
2399 | struct seq_file *m = (struct seq_file *)file->private_data; | |
2400 | struct ftrace_iterator *iter; | |
2401 | ||
41c52c0d | 2402 | mutex_lock(&ftrace_regex_lock); |
5072c59f SR |
2403 | if (file->f_mode & FMODE_READ) { |
2404 | iter = m->private; | |
2405 | ||
2406 | seq_release(inode, file); | |
2407 | } else | |
2408 | iter = file->private_data; | |
2409 | ||
2410 | if (iter->buffer_idx) { | |
2411 | iter->filtered++; | |
2412 | iter->buffer[iter->buffer_idx] = 0; | |
7f24b31b | 2413 | ftrace_match_records(iter->buffer, iter->buffer_idx, enable); |
5072c59f SR |
2414 | } |
2415 | ||
e6ea44e9 | 2416 | mutex_lock(&ftrace_lock); |
ee02a2e5 | 2417 | if (ftrace_start_up && ftrace_enabled) |
5072c59f | 2418 | ftrace_run_update_code(FTRACE_ENABLE_CALLS); |
e6ea44e9 | 2419 | mutex_unlock(&ftrace_lock); |
5072c59f SR |
2420 | |
2421 | kfree(iter); | |
41c52c0d | 2422 | mutex_unlock(&ftrace_regex_lock); |
5072c59f SR |
2423 | return 0; |
2424 | } | |
2425 | ||
41c52c0d SR |
2426 | static int |
2427 | ftrace_filter_release(struct inode *inode, struct file *file) | |
2428 | { | |
2429 | return ftrace_regex_release(inode, file, 1); | |
2430 | } | |
2431 | ||
2432 | static int | |
2433 | ftrace_notrace_release(struct inode *inode, struct file *file) | |
2434 | { | |
2435 | return ftrace_regex_release(inode, file, 0); | |
2436 | } | |
2437 | ||
5e2336a0 | 2438 | static const struct file_operations ftrace_avail_fops = { |
5072c59f SR |
2439 | .open = ftrace_avail_open, |
2440 | .read = seq_read, | |
2441 | .llseek = seq_lseek, | |
2442 | .release = ftrace_avail_release, | |
2443 | }; | |
2444 | ||
5e2336a0 | 2445 | static const struct file_operations ftrace_failures_fops = { |
eb9a7bf0 AS |
2446 | .open = ftrace_failures_open, |
2447 | .read = seq_read, | |
2448 | .llseek = seq_lseek, | |
2449 | .release = ftrace_avail_release, | |
2450 | }; | |
2451 | ||
5e2336a0 | 2452 | static const struct file_operations ftrace_filter_fops = { |
5072c59f | 2453 | .open = ftrace_filter_open, |
850a80cf | 2454 | .read = seq_read, |
5072c59f | 2455 | .write = ftrace_filter_write, |
41c52c0d | 2456 | .llseek = ftrace_regex_lseek, |
5072c59f SR |
2457 | .release = ftrace_filter_release, |
2458 | }; | |
2459 | ||
5e2336a0 | 2460 | static const struct file_operations ftrace_notrace_fops = { |
41c52c0d | 2461 | .open = ftrace_notrace_open, |
850a80cf | 2462 | .read = seq_read, |
41c52c0d SR |
2463 | .write = ftrace_notrace_write, |
2464 | .llseek = ftrace_regex_lseek, | |
2465 | .release = ftrace_notrace_release, | |
2466 | }; | |
2467 | ||
ea4e2bc4 SR |
2468 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
2469 | ||
2470 | static DEFINE_MUTEX(graph_lock); | |
2471 | ||
2472 | int ftrace_graph_count; | |
2473 | unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS] __read_mostly; | |
2474 | ||
2475 | static void * | |
2476 | g_next(struct seq_file *m, void *v, loff_t *pos) | |
2477 | { | |
2478 | unsigned long *array = m->private; | |
2479 | int index = *pos; | |
2480 | ||
2481 | (*pos)++; | |
2482 | ||
2483 | if (index >= ftrace_graph_count) | |
2484 | return NULL; | |
2485 | ||
2486 | return &array[index]; | |
2487 | } | |
2488 | ||
2489 | static void *g_start(struct seq_file *m, loff_t *pos) | |
2490 | { | |
2491 | void *p = NULL; | |
2492 | ||
2493 | mutex_lock(&graph_lock); | |
2494 | ||
f9349a8f FW |
2495 | /* Nothing, tell g_show to print all functions are enabled */ |
2496 | if (!ftrace_graph_count && !*pos) | |
2497 | return (void *)1; | |
2498 | ||
ea4e2bc4 SR |
2499 | p = g_next(m, p, pos); |
2500 | ||
2501 | return p; | |
2502 | } | |
2503 | ||
2504 | static void g_stop(struct seq_file *m, void *p) | |
2505 | { | |
2506 | mutex_unlock(&graph_lock); | |
2507 | } | |
2508 | ||
2509 | static int g_show(struct seq_file *m, void *v) | |
2510 | { | |
2511 | unsigned long *ptr = v; | |
2512 | char str[KSYM_SYMBOL_LEN]; | |
2513 | ||
2514 | if (!ptr) | |
2515 | return 0; | |
2516 | ||
f9349a8f FW |
2517 | if (ptr == (unsigned long *)1) { |
2518 | seq_printf(m, "#### all functions enabled ####\n"); | |
2519 | return 0; | |
2520 | } | |
2521 | ||
ea4e2bc4 SR |
2522 | kallsyms_lookup(*ptr, NULL, NULL, NULL, str); |
2523 | ||
2524 | seq_printf(m, "%s\n", str); | |
2525 | ||
2526 | return 0; | |
2527 | } | |
2528 | ||
2529 | static struct seq_operations ftrace_graph_seq_ops = { | |
2530 | .start = g_start, | |
2531 | .next = g_next, | |
2532 | .stop = g_stop, | |
2533 | .show = g_show, | |
2534 | }; | |
2535 | ||
2536 | static int | |
2537 | ftrace_graph_open(struct inode *inode, struct file *file) | |
2538 | { | |
2539 | int ret = 0; | |
2540 | ||
2541 | if (unlikely(ftrace_disabled)) | |
2542 | return -ENODEV; | |
2543 | ||
2544 | mutex_lock(&graph_lock); | |
2545 | if ((file->f_mode & FMODE_WRITE) && | |
2546 | !(file->f_flags & O_APPEND)) { | |
2547 | ftrace_graph_count = 0; | |
2548 | memset(ftrace_graph_funcs, 0, sizeof(ftrace_graph_funcs)); | |
2549 | } | |
2550 | ||
2551 | if (file->f_mode & FMODE_READ) { | |
2552 | ret = seq_open(file, &ftrace_graph_seq_ops); | |
2553 | if (!ret) { | |
2554 | struct seq_file *m = file->private_data; | |
2555 | m->private = ftrace_graph_funcs; | |
2556 | } | |
2557 | } else | |
2558 | file->private_data = ftrace_graph_funcs; | |
2559 | mutex_unlock(&graph_lock); | |
2560 | ||
2561 | return ret; | |
2562 | } | |
2563 | ||
ea4e2bc4 | 2564 | static int |
f9349a8f | 2565 | ftrace_set_func(unsigned long *array, int *idx, char *buffer) |
ea4e2bc4 | 2566 | { |
ea4e2bc4 SR |
2567 | struct dyn_ftrace *rec; |
2568 | struct ftrace_page *pg; | |
f9349a8f | 2569 | int search_len; |
ea4e2bc4 | 2570 | int found = 0; |
f9349a8f FW |
2571 | int type, not; |
2572 | char *search; | |
2573 | bool exists; | |
2574 | int i; | |
ea4e2bc4 SR |
2575 | |
2576 | if (ftrace_disabled) | |
2577 | return -ENODEV; | |
2578 | ||
f9349a8f FW |
2579 | /* decode regex */ |
2580 | type = ftrace_setup_glob(buffer, strlen(buffer), &search, ¬); | |
2581 | if (not) | |
2582 | return -EINVAL; | |
2583 | ||
2584 | search_len = strlen(search); | |
2585 | ||
52baf119 | 2586 | mutex_lock(&ftrace_lock); |
265c831c SR |
2587 | do_for_each_ftrace_rec(pg, rec) { |
2588 | ||
f9349a8f FW |
2589 | if (*idx >= FTRACE_GRAPH_MAX_FUNCS) |
2590 | break; | |
2591 | ||
265c831c SR |
2592 | if (rec->flags & (FTRACE_FL_FAILED | FTRACE_FL_FREE)) |
2593 | continue; | |
2594 | ||
f9349a8f FW |
2595 | if (ftrace_match_record(rec, search, search_len, type)) { |
2596 | /* ensure it is not already in the array */ | |
2597 | exists = false; | |
2598 | for (i = 0; i < *idx; i++) | |
2599 | if (array[i] == rec->ip) { | |
2600 | exists = true; | |
265c831c SR |
2601 | break; |
2602 | } | |
f9349a8f FW |
2603 | if (!exists) { |
2604 | array[(*idx)++] = rec->ip; | |
2605 | found = 1; | |
2606 | } | |
ea4e2bc4 | 2607 | } |
265c831c | 2608 | } while_for_each_ftrace_rec(); |
f9349a8f | 2609 | |
52baf119 | 2610 | mutex_unlock(&ftrace_lock); |
ea4e2bc4 SR |
2611 | |
2612 | return found ? 0 : -EINVAL; | |
2613 | } | |
2614 | ||
2615 | static ssize_t | |
2616 | ftrace_graph_write(struct file *file, const char __user *ubuf, | |
2617 | size_t cnt, loff_t *ppos) | |
2618 | { | |
2619 | unsigned char buffer[FTRACE_BUFF_MAX+1]; | |
2620 | unsigned long *array; | |
2621 | size_t read = 0; | |
2622 | ssize_t ret; | |
2623 | int index = 0; | |
2624 | char ch; | |
2625 | ||
2626 | if (!cnt || cnt < 0) | |
2627 | return 0; | |
2628 | ||
2629 | mutex_lock(&graph_lock); | |
2630 | ||
2631 | if (ftrace_graph_count >= FTRACE_GRAPH_MAX_FUNCS) { | |
2632 | ret = -EBUSY; | |
2633 | goto out; | |
2634 | } | |
2635 | ||
2636 | if (file->f_mode & FMODE_READ) { | |
2637 | struct seq_file *m = file->private_data; | |
2638 | array = m->private; | |
2639 | } else | |
2640 | array = file->private_data; | |
2641 | ||
2642 | ret = get_user(ch, ubuf++); | |
2643 | if (ret) | |
2644 | goto out; | |
2645 | read++; | |
2646 | cnt--; | |
2647 | ||
2648 | /* skip white space */ | |
2649 | while (cnt && isspace(ch)) { | |
2650 | ret = get_user(ch, ubuf++); | |
2651 | if (ret) | |
2652 | goto out; | |
2653 | read++; | |
2654 | cnt--; | |
2655 | } | |
2656 | ||
2657 | if (isspace(ch)) { | |
2658 | *ppos += read; | |
2659 | ret = read; | |
2660 | goto out; | |
2661 | } | |
2662 | ||
2663 | while (cnt && !isspace(ch)) { | |
2664 | if (index < FTRACE_BUFF_MAX) | |
2665 | buffer[index++] = ch; | |
2666 | else { | |
2667 | ret = -EINVAL; | |
2668 | goto out; | |
2669 | } | |
2670 | ret = get_user(ch, ubuf++); | |
2671 | if (ret) | |
2672 | goto out; | |
2673 | read++; | |
2674 | cnt--; | |
2675 | } | |
2676 | buffer[index] = 0; | |
2677 | ||
f9349a8f FW |
2678 | /* we allow only one expression at a time */ |
2679 | ret = ftrace_set_func(array, &ftrace_graph_count, buffer); | |
ea4e2bc4 SR |
2680 | if (ret) |
2681 | goto out; | |
2682 | ||
ea4e2bc4 SR |
2683 | file->f_pos += read; |
2684 | ||
2685 | ret = read; | |
2686 | out: | |
2687 | mutex_unlock(&graph_lock); | |
2688 | ||
2689 | return ret; | |
2690 | } | |
2691 | ||
2692 | static const struct file_operations ftrace_graph_fops = { | |
2693 | .open = ftrace_graph_open, | |
850a80cf | 2694 | .read = seq_read, |
ea4e2bc4 SR |
2695 | .write = ftrace_graph_write, |
2696 | }; | |
2697 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ | |
2698 | ||
df4fc315 | 2699 | static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer) |
5072c59f | 2700 | { |
5072c59f | 2701 | |
5452af66 FW |
2702 | trace_create_file("available_filter_functions", 0444, |
2703 | d_tracer, NULL, &ftrace_avail_fops); | |
5072c59f | 2704 | |
5452af66 FW |
2705 | trace_create_file("failures", 0444, |
2706 | d_tracer, NULL, &ftrace_failures_fops); | |
eb9a7bf0 | 2707 | |
5452af66 FW |
2708 | trace_create_file("set_ftrace_filter", 0644, d_tracer, |
2709 | NULL, &ftrace_filter_fops); | |
41c52c0d | 2710 | |
5452af66 | 2711 | trace_create_file("set_ftrace_notrace", 0644, d_tracer, |
41c52c0d | 2712 | NULL, &ftrace_notrace_fops); |
ad90c0e3 | 2713 | |
ea4e2bc4 | 2714 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
5452af66 | 2715 | trace_create_file("set_graph_function", 0444, d_tracer, |
ea4e2bc4 SR |
2716 | NULL, |
2717 | &ftrace_graph_fops); | |
ea4e2bc4 SR |
2718 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
2719 | ||
5072c59f SR |
2720 | return 0; |
2721 | } | |
2722 | ||
31e88909 SR |
2723 | static int ftrace_convert_nops(struct module *mod, |
2724 | unsigned long *start, | |
68bf21aa SR |
2725 | unsigned long *end) |
2726 | { | |
2727 | unsigned long *p; | |
2728 | unsigned long addr; | |
2729 | unsigned long flags; | |
2730 | ||
e6ea44e9 | 2731 | mutex_lock(&ftrace_lock); |
68bf21aa SR |
2732 | p = start; |
2733 | while (p < end) { | |
2734 | addr = ftrace_call_adjust(*p++); | |
20e5227e SR |
2735 | /* |
2736 | * Some architecture linkers will pad between | |
2737 | * the different mcount_loc sections of different | |
2738 | * object files to satisfy alignments. | |
2739 | * Skip any NULL pointers. | |
2740 | */ | |
2741 | if (!addr) | |
2742 | continue; | |
68bf21aa | 2743 | ftrace_record_ip(addr); |
68bf21aa SR |
2744 | } |
2745 | ||
08f5ac90 | 2746 | /* disable interrupts to prevent kstop machine */ |
68bf21aa | 2747 | local_irq_save(flags); |
31e88909 | 2748 | ftrace_update_code(mod); |
68bf21aa | 2749 | local_irq_restore(flags); |
e6ea44e9 | 2750 | mutex_unlock(&ftrace_lock); |
68bf21aa SR |
2751 | |
2752 | return 0; | |
2753 | } | |
2754 | ||
31e88909 SR |
2755 | void ftrace_init_module(struct module *mod, |
2756 | unsigned long *start, unsigned long *end) | |
90d595fe | 2757 | { |
00fd61ae | 2758 | if (ftrace_disabled || start == end) |
fed1939c | 2759 | return; |
31e88909 | 2760 | ftrace_convert_nops(mod, start, end); |
90d595fe SR |
2761 | } |
2762 | ||
68bf21aa SR |
2763 | extern unsigned long __start_mcount_loc[]; |
2764 | extern unsigned long __stop_mcount_loc[]; | |
2765 | ||
2766 | void __init ftrace_init(void) | |
2767 | { | |
2768 | unsigned long count, addr, flags; | |
2769 | int ret; | |
2770 | ||
2771 | /* Keep the ftrace pointer to the stub */ | |
2772 | addr = (unsigned long)ftrace_stub; | |
2773 | ||
2774 | local_irq_save(flags); | |
2775 | ftrace_dyn_arch_init(&addr); | |
2776 | local_irq_restore(flags); | |
2777 | ||
2778 | /* ftrace_dyn_arch_init places the return code in addr */ | |
2779 | if (addr) | |
2780 | goto failed; | |
2781 | ||
2782 | count = __stop_mcount_loc - __start_mcount_loc; | |
2783 | ||
2784 | ret = ftrace_dyn_table_alloc(count); | |
2785 | if (ret) | |
2786 | goto failed; | |
2787 | ||
2788 | last_ftrace_enabled = ftrace_enabled = 1; | |
2789 | ||
31e88909 SR |
2790 | ret = ftrace_convert_nops(NULL, |
2791 | __start_mcount_loc, | |
68bf21aa SR |
2792 | __stop_mcount_loc); |
2793 | ||
2794 | return; | |
2795 | failed: | |
2796 | ftrace_disabled = 1; | |
2797 | } | |
68bf21aa | 2798 | |
3d083395 | 2799 | #else |
0b6e4d56 FW |
2800 | |
2801 | static int __init ftrace_nodyn_init(void) | |
2802 | { | |
2803 | ftrace_enabled = 1; | |
2804 | return 0; | |
2805 | } | |
2806 | device_initcall(ftrace_nodyn_init); | |
2807 | ||
df4fc315 SR |
2808 | static inline int ftrace_init_dyn_debugfs(struct dentry *d_tracer) { return 0; } |
2809 | static inline void ftrace_startup_enable(int command) { } | |
5a45cfe1 SR |
2810 | /* Keep as macros so we do not need to define the commands */ |
2811 | # define ftrace_startup(command) do { } while (0) | |
2812 | # define ftrace_shutdown(command) do { } while (0) | |
c7aafc54 IM |
2813 | # define ftrace_startup_sysctl() do { } while (0) |
2814 | # define ftrace_shutdown_sysctl() do { } while (0) | |
3d083395 SR |
2815 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
2816 | ||
df4fc315 SR |
2817 | static ssize_t |
2818 | ftrace_pid_read(struct file *file, char __user *ubuf, | |
2819 | size_t cnt, loff_t *ppos) | |
2820 | { | |
2821 | char buf[64]; | |
2822 | int r; | |
2823 | ||
e32d8956 SR |
2824 | if (ftrace_pid_trace == ftrace_swapper_pid) |
2825 | r = sprintf(buf, "swapper tasks\n"); | |
2826 | else if (ftrace_pid_trace) | |
cc59c9e8 | 2827 | r = sprintf(buf, "%u\n", pid_vnr(ftrace_pid_trace)); |
df4fc315 SR |
2828 | else |
2829 | r = sprintf(buf, "no pid\n"); | |
2830 | ||
2831 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2832 | } | |
2833 | ||
e32d8956 | 2834 | static void clear_ftrace_swapper(void) |
978f3a45 SR |
2835 | { |
2836 | struct task_struct *p; | |
e32d8956 | 2837 | int cpu; |
978f3a45 | 2838 | |
e32d8956 SR |
2839 | get_online_cpus(); |
2840 | for_each_online_cpu(cpu) { | |
2841 | p = idle_task(cpu); | |
978f3a45 | 2842 | clear_tsk_trace_trace(p); |
e32d8956 SR |
2843 | } |
2844 | put_online_cpus(); | |
2845 | } | |
978f3a45 | 2846 | |
e32d8956 SR |
2847 | static void set_ftrace_swapper(void) |
2848 | { | |
2849 | struct task_struct *p; | |
2850 | int cpu; | |
2851 | ||
2852 | get_online_cpus(); | |
2853 | for_each_online_cpu(cpu) { | |
2854 | p = idle_task(cpu); | |
2855 | set_tsk_trace_trace(p); | |
2856 | } | |
2857 | put_online_cpus(); | |
978f3a45 SR |
2858 | } |
2859 | ||
e32d8956 SR |
2860 | static void clear_ftrace_pid(struct pid *pid) |
2861 | { | |
2862 | struct task_struct *p; | |
2863 | ||
229c4ef8 | 2864 | rcu_read_lock(); |
e32d8956 SR |
2865 | do_each_pid_task(pid, PIDTYPE_PID, p) { |
2866 | clear_tsk_trace_trace(p); | |
2867 | } while_each_pid_task(pid, PIDTYPE_PID, p); | |
229c4ef8 ON |
2868 | rcu_read_unlock(); |
2869 | ||
e32d8956 SR |
2870 | put_pid(pid); |
2871 | } | |
2872 | ||
2873 | static void set_ftrace_pid(struct pid *pid) | |
978f3a45 SR |
2874 | { |
2875 | struct task_struct *p; | |
2876 | ||
229c4ef8 | 2877 | rcu_read_lock(); |
978f3a45 SR |
2878 | do_each_pid_task(pid, PIDTYPE_PID, p) { |
2879 | set_tsk_trace_trace(p); | |
2880 | } while_each_pid_task(pid, PIDTYPE_PID, p); | |
229c4ef8 | 2881 | rcu_read_unlock(); |
978f3a45 SR |
2882 | } |
2883 | ||
e32d8956 SR |
2884 | static void clear_ftrace_pid_task(struct pid **pid) |
2885 | { | |
2886 | if (*pid == ftrace_swapper_pid) | |
2887 | clear_ftrace_swapper(); | |
2888 | else | |
2889 | clear_ftrace_pid(*pid); | |
2890 | ||
2891 | *pid = NULL; | |
2892 | } | |
2893 | ||
2894 | static void set_ftrace_pid_task(struct pid *pid) | |
2895 | { | |
2896 | if (pid == ftrace_swapper_pid) | |
2897 | set_ftrace_swapper(); | |
2898 | else | |
2899 | set_ftrace_pid(pid); | |
2900 | } | |
2901 | ||
df4fc315 SR |
2902 | static ssize_t |
2903 | ftrace_pid_write(struct file *filp, const char __user *ubuf, | |
2904 | size_t cnt, loff_t *ppos) | |
2905 | { | |
978f3a45 | 2906 | struct pid *pid; |
df4fc315 SR |
2907 | char buf[64]; |
2908 | long val; | |
2909 | int ret; | |
2910 | ||
2911 | if (cnt >= sizeof(buf)) | |
2912 | return -EINVAL; | |
2913 | ||
2914 | if (copy_from_user(&buf, ubuf, cnt)) | |
2915 | return -EFAULT; | |
2916 | ||
2917 | buf[cnt] = 0; | |
2918 | ||
2919 | ret = strict_strtol(buf, 10, &val); | |
2920 | if (ret < 0) | |
2921 | return ret; | |
2922 | ||
e6ea44e9 | 2923 | mutex_lock(&ftrace_lock); |
978f3a45 | 2924 | if (val < 0) { |
df4fc315 | 2925 | /* disable pid tracing */ |
978f3a45 | 2926 | if (!ftrace_pid_trace) |
df4fc315 | 2927 | goto out; |
978f3a45 SR |
2928 | |
2929 | clear_ftrace_pid_task(&ftrace_pid_trace); | |
df4fc315 SR |
2930 | |
2931 | } else { | |
e32d8956 SR |
2932 | /* swapper task is special */ |
2933 | if (!val) { | |
2934 | pid = ftrace_swapper_pid; | |
2935 | if (pid == ftrace_pid_trace) | |
2936 | goto out; | |
2937 | } else { | |
2938 | pid = find_get_pid(val); | |
df4fc315 | 2939 | |
e32d8956 SR |
2940 | if (pid == ftrace_pid_trace) { |
2941 | put_pid(pid); | |
2942 | goto out; | |
2943 | } | |
0ef8cde5 | 2944 | } |
0ef8cde5 | 2945 | |
978f3a45 SR |
2946 | if (ftrace_pid_trace) |
2947 | clear_ftrace_pid_task(&ftrace_pid_trace); | |
2948 | ||
2949 | if (!pid) | |
2950 | goto out; | |
2951 | ||
2952 | ftrace_pid_trace = pid; | |
2953 | ||
2954 | set_ftrace_pid_task(ftrace_pid_trace); | |
df4fc315 SR |
2955 | } |
2956 | ||
2957 | /* update the function call */ | |
2958 | ftrace_update_pid_func(); | |
2959 | ftrace_startup_enable(0); | |
2960 | ||
2961 | out: | |
e6ea44e9 | 2962 | mutex_unlock(&ftrace_lock); |
df4fc315 SR |
2963 | |
2964 | return cnt; | |
2965 | } | |
2966 | ||
5e2336a0 | 2967 | static const struct file_operations ftrace_pid_fops = { |
df4fc315 SR |
2968 | .read = ftrace_pid_read, |
2969 | .write = ftrace_pid_write, | |
2970 | }; | |
2971 | ||
2972 | static __init int ftrace_init_debugfs(void) | |
2973 | { | |
2974 | struct dentry *d_tracer; | |
df4fc315 SR |
2975 | |
2976 | d_tracer = tracing_init_dentry(); | |
2977 | if (!d_tracer) | |
2978 | return 0; | |
2979 | ||
2980 | ftrace_init_dyn_debugfs(d_tracer); | |
2981 | ||
5452af66 FW |
2982 | trace_create_file("set_ftrace_pid", 0644, d_tracer, |
2983 | NULL, &ftrace_pid_fops); | |
493762fc SR |
2984 | |
2985 | ftrace_profile_debugfs(d_tracer); | |
2986 | ||
df4fc315 SR |
2987 | return 0; |
2988 | } | |
df4fc315 SR |
2989 | fs_initcall(ftrace_init_debugfs); |
2990 | ||
a2bb6a3d | 2991 | /** |
81adbdc0 | 2992 | * ftrace_kill - kill ftrace |
a2bb6a3d SR |
2993 | * |
2994 | * This function should be used by panic code. It stops ftrace | |
2995 | * but in a not so nice way. If you need to simply kill ftrace | |
2996 | * from a non-atomic section, use ftrace_kill. | |
2997 | */ | |
81adbdc0 | 2998 | void ftrace_kill(void) |
a2bb6a3d SR |
2999 | { |
3000 | ftrace_disabled = 1; | |
3001 | ftrace_enabled = 0; | |
a2bb6a3d SR |
3002 | clear_ftrace_function(); |
3003 | } | |
3004 | ||
16444a8a | 3005 | /** |
3d083395 SR |
3006 | * register_ftrace_function - register a function for profiling |
3007 | * @ops - ops structure that holds the function for profiling. | |
16444a8a | 3008 | * |
3d083395 SR |
3009 | * Register a function to be called by all functions in the |
3010 | * kernel. | |
3011 | * | |
3012 | * Note: @ops->func and all the functions it calls must be labeled | |
3013 | * with "notrace", otherwise it will go into a | |
3014 | * recursive loop. | |
16444a8a | 3015 | */ |
3d083395 | 3016 | int register_ftrace_function(struct ftrace_ops *ops) |
16444a8a | 3017 | { |
b0fc494f SR |
3018 | int ret; |
3019 | ||
4eebcc81 SR |
3020 | if (unlikely(ftrace_disabled)) |
3021 | return -1; | |
3022 | ||
e6ea44e9 | 3023 | mutex_lock(&ftrace_lock); |
e7d3737e | 3024 | |
b0fc494f | 3025 | ret = __register_ftrace_function(ops); |
5a45cfe1 | 3026 | ftrace_startup(0); |
b0fc494f | 3027 | |
e6ea44e9 | 3028 | mutex_unlock(&ftrace_lock); |
b0fc494f | 3029 | return ret; |
3d083395 SR |
3030 | } |
3031 | ||
3032 | /** | |
32632920 | 3033 | * unregister_ftrace_function - unregister a function for profiling. |
3d083395 SR |
3034 | * @ops - ops structure that holds the function to unregister |
3035 | * | |
3036 | * Unregister a function that was added to be called by ftrace profiling. | |
3037 | */ | |
3038 | int unregister_ftrace_function(struct ftrace_ops *ops) | |
3039 | { | |
3040 | int ret; | |
3041 | ||
e6ea44e9 | 3042 | mutex_lock(&ftrace_lock); |
3d083395 | 3043 | ret = __unregister_ftrace_function(ops); |
5a45cfe1 | 3044 | ftrace_shutdown(0); |
e6ea44e9 | 3045 | mutex_unlock(&ftrace_lock); |
b0fc494f SR |
3046 | |
3047 | return ret; | |
3048 | } | |
3049 | ||
e309b41d | 3050 | int |
b0fc494f | 3051 | ftrace_enable_sysctl(struct ctl_table *table, int write, |
5072c59f | 3052 | struct file *file, void __user *buffer, size_t *lenp, |
b0fc494f SR |
3053 | loff_t *ppos) |
3054 | { | |
3055 | int ret; | |
3056 | ||
4eebcc81 SR |
3057 | if (unlikely(ftrace_disabled)) |
3058 | return -ENODEV; | |
3059 | ||
e6ea44e9 | 3060 | mutex_lock(&ftrace_lock); |
b0fc494f | 3061 | |
5072c59f | 3062 | ret = proc_dointvec(table, write, file, buffer, lenp, ppos); |
b0fc494f SR |
3063 | |
3064 | if (ret || !write || (last_ftrace_enabled == ftrace_enabled)) | |
3065 | goto out; | |
3066 | ||
3067 | last_ftrace_enabled = ftrace_enabled; | |
3068 | ||
3069 | if (ftrace_enabled) { | |
3070 | ||
3071 | ftrace_startup_sysctl(); | |
3072 | ||
3073 | /* we are starting ftrace again */ | |
3074 | if (ftrace_list != &ftrace_list_end) { | |
3075 | if (ftrace_list->next == &ftrace_list_end) | |
3076 | ftrace_trace_function = ftrace_list->func; | |
3077 | else | |
3078 | ftrace_trace_function = ftrace_list_func; | |
3079 | } | |
3080 | ||
3081 | } else { | |
3082 | /* stopping ftrace calls (just send to ftrace_stub) */ | |
3083 | ftrace_trace_function = ftrace_stub; | |
3084 | ||
3085 | ftrace_shutdown_sysctl(); | |
3086 | } | |
3087 | ||
3088 | out: | |
e6ea44e9 | 3089 | mutex_unlock(&ftrace_lock); |
3d083395 | 3090 | return ret; |
16444a8a | 3091 | } |
f17845e5 | 3092 | |
fb52607a | 3093 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
e7d3737e | 3094 | |
597af815 | 3095 | static int ftrace_graph_active; |
4a2b8dda | 3096 | static struct notifier_block ftrace_suspend_notifier; |
e7d3737e | 3097 | |
e49dc19c SR |
3098 | int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace) |
3099 | { | |
3100 | return 0; | |
3101 | } | |
3102 | ||
287b6e68 FW |
3103 | /* The callbacks that hook a function */ |
3104 | trace_func_graph_ret_t ftrace_graph_return = | |
3105 | (trace_func_graph_ret_t)ftrace_stub; | |
e49dc19c | 3106 | trace_func_graph_ent_t ftrace_graph_entry = ftrace_graph_entry_stub; |
f201ae23 FW |
3107 | |
3108 | /* Try to assign a return stack array on FTRACE_RETSTACK_ALLOC_SIZE tasks. */ | |
3109 | static int alloc_retstack_tasklist(struct ftrace_ret_stack **ret_stack_list) | |
3110 | { | |
3111 | int i; | |
3112 | int ret = 0; | |
3113 | unsigned long flags; | |
3114 | int start = 0, end = FTRACE_RETSTACK_ALLOC_SIZE; | |
3115 | struct task_struct *g, *t; | |
3116 | ||
3117 | for (i = 0; i < FTRACE_RETSTACK_ALLOC_SIZE; i++) { | |
3118 | ret_stack_list[i] = kmalloc(FTRACE_RETFUNC_DEPTH | |
3119 | * sizeof(struct ftrace_ret_stack), | |
3120 | GFP_KERNEL); | |
3121 | if (!ret_stack_list[i]) { | |
3122 | start = 0; | |
3123 | end = i; | |
3124 | ret = -ENOMEM; | |
3125 | goto free; | |
3126 | } | |
3127 | } | |
3128 | ||
3129 | read_lock_irqsave(&tasklist_lock, flags); | |
3130 | do_each_thread(g, t) { | |
3131 | if (start == end) { | |
3132 | ret = -EAGAIN; | |
3133 | goto unlock; | |
3134 | } | |
3135 | ||
3136 | if (t->ret_stack == NULL) { | |
f201ae23 | 3137 | t->curr_ret_stack = -1; |
48d68b20 FW |
3138 | /* Make sure IRQs see the -1 first: */ |
3139 | barrier(); | |
3140 | t->ret_stack = ret_stack_list[start++]; | |
380c4b14 | 3141 | atomic_set(&t->tracing_graph_pause, 0); |
f201ae23 FW |
3142 | atomic_set(&t->trace_overrun, 0); |
3143 | } | |
3144 | } while_each_thread(g, t); | |
3145 | ||
3146 | unlock: | |
3147 | read_unlock_irqrestore(&tasklist_lock, flags); | |
3148 | free: | |
3149 | for (i = start; i < end; i++) | |
3150 | kfree(ret_stack_list[i]); | |
3151 | return ret; | |
3152 | } | |
3153 | ||
8aef2d28 SR |
3154 | static void |
3155 | ftrace_graph_probe_sched_switch(struct rq *__rq, struct task_struct *prev, | |
3156 | struct task_struct *next) | |
3157 | { | |
3158 | unsigned long long timestamp; | |
3159 | int index; | |
3160 | ||
be6f164a SR |
3161 | /* |
3162 | * Does the user want to count the time a function was asleep. | |
3163 | * If so, do not update the time stamps. | |
3164 | */ | |
3165 | if (trace_flags & TRACE_ITER_SLEEP_TIME) | |
3166 | return; | |
3167 | ||
8aef2d28 SR |
3168 | timestamp = trace_clock_local(); |
3169 | ||
3170 | prev->ftrace_timestamp = timestamp; | |
3171 | ||
3172 | /* only process tasks that we timestamped */ | |
3173 | if (!next->ftrace_timestamp) | |
3174 | return; | |
3175 | ||
3176 | /* | |
3177 | * Update all the counters in next to make up for the | |
3178 | * time next was sleeping. | |
3179 | */ | |
3180 | timestamp -= next->ftrace_timestamp; | |
3181 | ||
3182 | for (index = next->curr_ret_stack; index >= 0; index--) | |
3183 | next->ret_stack[index].calltime += timestamp; | |
3184 | } | |
3185 | ||
f201ae23 | 3186 | /* Allocate a return stack for each task */ |
fb52607a | 3187 | static int start_graph_tracing(void) |
f201ae23 FW |
3188 | { |
3189 | struct ftrace_ret_stack **ret_stack_list; | |
5b058bcd | 3190 | int ret, cpu; |
f201ae23 FW |
3191 | |
3192 | ret_stack_list = kmalloc(FTRACE_RETSTACK_ALLOC_SIZE * | |
3193 | sizeof(struct ftrace_ret_stack *), | |
3194 | GFP_KERNEL); | |
3195 | ||
3196 | if (!ret_stack_list) | |
3197 | return -ENOMEM; | |
3198 | ||
5b058bcd FW |
3199 | /* The cpu_boot init_task->ret_stack will never be freed */ |
3200 | for_each_online_cpu(cpu) | |
3201 | ftrace_graph_init_task(idle_task(cpu)); | |
3202 | ||
f201ae23 FW |
3203 | do { |
3204 | ret = alloc_retstack_tasklist(ret_stack_list); | |
3205 | } while (ret == -EAGAIN); | |
3206 | ||
8aef2d28 SR |
3207 | if (!ret) { |
3208 | ret = register_trace_sched_switch(ftrace_graph_probe_sched_switch); | |
3209 | if (ret) | |
3210 | pr_info("ftrace_graph: Couldn't activate tracepoint" | |
3211 | " probe to kernel_sched_switch\n"); | |
3212 | } | |
3213 | ||
f201ae23 FW |
3214 | kfree(ret_stack_list); |
3215 | return ret; | |
3216 | } | |
3217 | ||
4a2b8dda FW |
3218 | /* |
3219 | * Hibernation protection. | |
3220 | * The state of the current task is too much unstable during | |
3221 | * suspend/restore to disk. We want to protect against that. | |
3222 | */ | |
3223 | static int | |
3224 | ftrace_suspend_notifier_call(struct notifier_block *bl, unsigned long state, | |
3225 | void *unused) | |
3226 | { | |
3227 | switch (state) { | |
3228 | case PM_HIBERNATION_PREPARE: | |
3229 | pause_graph_tracing(); | |
3230 | break; | |
3231 | ||
3232 | case PM_POST_HIBERNATION: | |
3233 | unpause_graph_tracing(); | |
3234 | break; | |
3235 | } | |
3236 | return NOTIFY_DONE; | |
3237 | } | |
3238 | ||
287b6e68 FW |
3239 | int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
3240 | trace_func_graph_ent_t entryfunc) | |
15e6cb36 | 3241 | { |
e7d3737e FW |
3242 | int ret = 0; |
3243 | ||
e6ea44e9 | 3244 | mutex_lock(&ftrace_lock); |
e7d3737e | 3245 | |
05ce5818 | 3246 | /* we currently allow only one tracer registered at a time */ |
597af815 | 3247 | if (ftrace_graph_active) { |
05ce5818 SR |
3248 | ret = -EBUSY; |
3249 | goto out; | |
3250 | } | |
3251 | ||
4a2b8dda FW |
3252 | ftrace_suspend_notifier.notifier_call = ftrace_suspend_notifier_call; |
3253 | register_pm_notifier(&ftrace_suspend_notifier); | |
3254 | ||
597af815 | 3255 | ftrace_graph_active++; |
fb52607a | 3256 | ret = start_graph_tracing(); |
f201ae23 | 3257 | if (ret) { |
597af815 | 3258 | ftrace_graph_active--; |
f201ae23 FW |
3259 | goto out; |
3260 | } | |
e53a6319 | 3261 | |
287b6e68 FW |
3262 | ftrace_graph_return = retfunc; |
3263 | ftrace_graph_entry = entryfunc; | |
e53a6319 | 3264 | |
5a45cfe1 | 3265 | ftrace_startup(FTRACE_START_FUNC_RET); |
e7d3737e FW |
3266 | |
3267 | out: | |
e6ea44e9 | 3268 | mutex_unlock(&ftrace_lock); |
e7d3737e | 3269 | return ret; |
15e6cb36 FW |
3270 | } |
3271 | ||
fb52607a | 3272 | void unregister_ftrace_graph(void) |
15e6cb36 | 3273 | { |
e6ea44e9 | 3274 | mutex_lock(&ftrace_lock); |
e7d3737e | 3275 | |
597af815 | 3276 | if (unlikely(!ftrace_graph_active)) |
2aad1b76 SR |
3277 | goto out; |
3278 | ||
597af815 | 3279 | ftrace_graph_active--; |
8aef2d28 | 3280 | unregister_trace_sched_switch(ftrace_graph_probe_sched_switch); |
287b6e68 | 3281 | ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub; |
e49dc19c | 3282 | ftrace_graph_entry = ftrace_graph_entry_stub; |
5a45cfe1 | 3283 | ftrace_shutdown(FTRACE_STOP_FUNC_RET); |
4a2b8dda | 3284 | unregister_pm_notifier(&ftrace_suspend_notifier); |
e7d3737e | 3285 | |
2aad1b76 | 3286 | out: |
e6ea44e9 | 3287 | mutex_unlock(&ftrace_lock); |
15e6cb36 | 3288 | } |
f201ae23 FW |
3289 | |
3290 | /* Allocate a return stack for newly created task */ | |
fb52607a | 3291 | void ftrace_graph_init_task(struct task_struct *t) |
f201ae23 | 3292 | { |
597af815 | 3293 | if (ftrace_graph_active) { |
f201ae23 FW |
3294 | t->ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH |
3295 | * sizeof(struct ftrace_ret_stack), | |
3296 | GFP_KERNEL); | |
3297 | if (!t->ret_stack) | |
3298 | return; | |
3299 | t->curr_ret_stack = -1; | |
380c4b14 | 3300 | atomic_set(&t->tracing_graph_pause, 0); |
f201ae23 | 3301 | atomic_set(&t->trace_overrun, 0); |
8aef2d28 | 3302 | t->ftrace_timestamp = 0; |
f201ae23 FW |
3303 | } else |
3304 | t->ret_stack = NULL; | |
3305 | } | |
3306 | ||
fb52607a | 3307 | void ftrace_graph_exit_task(struct task_struct *t) |
f201ae23 | 3308 | { |
eae849ca FW |
3309 | struct ftrace_ret_stack *ret_stack = t->ret_stack; |
3310 | ||
f201ae23 | 3311 | t->ret_stack = NULL; |
eae849ca FW |
3312 | /* NULL must become visible to IRQs before we free it: */ |
3313 | barrier(); | |
3314 | ||
3315 | kfree(ret_stack); | |
f201ae23 | 3316 | } |
14a866c5 SR |
3317 | |
3318 | void ftrace_graph_stop(void) | |
3319 | { | |
3320 | ftrace_stop(); | |
3321 | } | |
15e6cb36 FW |
3322 | #endif |
3323 |