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Commit | Line | Data |
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bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
12 | * Copyright (C) 2004 William Lee Irwin III | |
13 | */ | |
14 | #include <linux/utsrelease.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <linux/debugfs.h> | |
4c11d7ae | 18 | #include <linux/pagemap.h> |
bc0c38d1 SR |
19 | #include <linux/hardirq.h> |
20 | #include <linux/linkage.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/ftrace.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/percpu.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/init.h> | |
2a2cc8f7 | 27 | #include <linux/poll.h> |
bc0c38d1 SR |
28 | #include <linux/gfp.h> |
29 | #include <linux/fs.h> | |
30 | ||
86387f7e IM |
31 | #include <linux/stacktrace.h> |
32 | ||
bc0c38d1 SR |
33 | #include "trace.h" |
34 | ||
35 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; | |
36 | unsigned long __read_mostly tracing_thresh; | |
37 | ||
60a11774 SR |
38 | static int tracing_disabled = 1; |
39 | ||
e309b41d | 40 | static long |
bc0c38d1 SR |
41 | ns2usecs(cycle_t nsec) |
42 | { | |
43 | nsec += 500; | |
44 | do_div(nsec, 1000); | |
45 | return nsec; | |
46 | } | |
47 | ||
e309b41d | 48 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 49 | { |
0fd9e0da | 50 | return cpu_clock(cpu); |
750ed1a4 IM |
51 | } |
52 | ||
bc0c38d1 SR |
53 | static struct trace_array global_trace; |
54 | ||
55 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
56 | ||
57 | static struct trace_array max_tr; | |
58 | ||
59 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
60 | ||
26994ead | 61 | static int tracer_enabled = 1; |
57422797 | 62 | static unsigned long trace_nr_entries = 65536UL; |
bc0c38d1 SR |
63 | |
64 | static struct tracer *trace_types __read_mostly; | |
65 | static struct tracer *current_trace __read_mostly; | |
66 | static int max_tracer_type_len; | |
67 | ||
68 | static DEFINE_MUTEX(trace_types_lock); | |
4e655519 IM |
69 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
70 | ||
71 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; | |
72 | ||
73 | /* | |
74 | * FIXME: where should this be called? | |
75 | */ | |
76 | void trace_wake_up(void) | |
77 | { | |
78 | if (!(trace_flags & TRACE_ITER_BLOCK)) | |
79 | wake_up(&trace_wait); | |
80 | } | |
bc0c38d1 | 81 | |
4c11d7ae SR |
82 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
83 | ||
bc0c38d1 SR |
84 | static int __init set_nr_entries(char *str) |
85 | { | |
86 | if (!str) | |
87 | return 0; | |
88 | trace_nr_entries = simple_strtoul(str, &str, 0); | |
89 | return 1; | |
90 | } | |
91 | __setup("trace_entries=", set_nr_entries); | |
92 | ||
57f50be1 SR |
93 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
94 | { | |
95 | return nsecs / 1000; | |
96 | } | |
97 | ||
bc0c38d1 SR |
98 | enum trace_type { |
99 | __TRACE_FIRST_TYPE = 0, | |
100 | ||
101 | TRACE_FN, | |
102 | TRACE_CTX, | |
57422797 | 103 | TRACE_WAKE, |
86387f7e | 104 | TRACE_STACK, |
f0a920d5 | 105 | TRACE_SPECIAL, |
bc0c38d1 SR |
106 | |
107 | __TRACE_LAST_TYPE | |
108 | }; | |
109 | ||
110 | enum trace_flag_type { | |
111 | TRACE_FLAG_IRQS_OFF = 0x01, | |
112 | TRACE_FLAG_NEED_RESCHED = 0x02, | |
113 | TRACE_FLAG_HARDIRQ = 0x04, | |
114 | TRACE_FLAG_SOFTIRQ = 0x08, | |
115 | }; | |
116 | ||
bc0c38d1 SR |
117 | #define TRACE_ITER_SYM_MASK \ |
118 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
119 | ||
120 | /* These must match the bit postions above */ | |
121 | static const char *trace_options[] = { | |
122 | "print-parent", | |
123 | "sym-offset", | |
124 | "sym-addr", | |
125 | "verbose", | |
f9896bf3 | 126 | "raw", |
5e3ca0ec | 127 | "hex", |
cb0f12aa | 128 | "bin", |
2a2cc8f7 | 129 | "block", |
86387f7e | 130 | "stacktrace", |
bc0c38d1 SR |
131 | NULL |
132 | }; | |
133 | ||
4c11d7ae | 134 | static DEFINE_SPINLOCK(ftrace_max_lock); |
bc0c38d1 SR |
135 | |
136 | /* | |
137 | * Copy the new maximum trace into the separate maximum-trace | |
138 | * structure. (this way the maximum trace is permanently saved, | |
139 | * for later retrieval via /debugfs/tracing/latency_trace) | |
140 | */ | |
e309b41d | 141 | static void |
bc0c38d1 SR |
142 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
143 | { | |
144 | struct trace_array_cpu *data = tr->data[cpu]; | |
145 | ||
146 | max_tr.cpu = cpu; | |
147 | max_tr.time_start = data->preempt_timestamp; | |
148 | ||
149 | data = max_tr.data[cpu]; | |
150 | data->saved_latency = tracing_max_latency; | |
151 | ||
152 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
153 | data->pid = tsk->pid; | |
154 | data->uid = tsk->uid; | |
155 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
156 | data->policy = tsk->policy; | |
157 | data->rt_priority = tsk->rt_priority; | |
158 | ||
159 | /* record this tasks comm */ | |
160 | tracing_record_cmdline(current); | |
161 | } | |
162 | ||
c7aafc54 IM |
163 | void check_pages(struct trace_array_cpu *data) |
164 | { | |
165 | struct page *page, *tmp; | |
166 | ||
167 | BUG_ON(data->trace_pages.next->prev != &data->trace_pages); | |
168 | BUG_ON(data->trace_pages.prev->next != &data->trace_pages); | |
169 | ||
170 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { | |
171 | BUG_ON(page->lru.next->prev != &page->lru); | |
172 | BUG_ON(page->lru.prev->next != &page->lru); | |
173 | } | |
174 | } | |
175 | ||
176 | void *head_page(struct trace_array_cpu *data) | |
177 | { | |
178 | struct page *page; | |
179 | ||
180 | check_pages(data); | |
181 | if (list_empty(&data->trace_pages)) | |
182 | return NULL; | |
183 | ||
184 | page = list_entry(data->trace_pages.next, struct page, lru); | |
185 | BUG_ON(&page->lru == &data->trace_pages); | |
186 | ||
187 | return page_address(page); | |
188 | } | |
189 | ||
e309b41d | 190 | static int |
214023c3 SR |
191 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
192 | { | |
193 | int len = (PAGE_SIZE - 1) - s->len; | |
194 | va_list ap; | |
b3806b43 | 195 | int ret; |
214023c3 SR |
196 | |
197 | if (!len) | |
198 | return 0; | |
199 | ||
200 | va_start(ap, fmt); | |
b3806b43 | 201 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
202 | va_end(ap); |
203 | ||
b3806b43 SR |
204 | /* If we can't write it all, don't bother writing anything */ |
205 | if (ret > len) | |
206 | return 0; | |
207 | ||
208 | s->len += ret; | |
214023c3 SR |
209 | |
210 | return len; | |
211 | } | |
212 | ||
e309b41d | 213 | static int |
214023c3 SR |
214 | trace_seq_puts(struct trace_seq *s, const char *str) |
215 | { | |
216 | int len = strlen(str); | |
217 | ||
218 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 219 | return 0; |
214023c3 SR |
220 | |
221 | memcpy(s->buffer + s->len, str, len); | |
222 | s->len += len; | |
223 | ||
224 | return len; | |
225 | } | |
226 | ||
e309b41d | 227 | static int |
214023c3 SR |
228 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
229 | { | |
230 | if (s->len >= (PAGE_SIZE - 1)) | |
231 | return 0; | |
232 | ||
233 | s->buffer[s->len++] = c; | |
234 | ||
235 | return 1; | |
236 | } | |
237 | ||
e309b41d | 238 | static int |
cb0f12aa IM |
239 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
240 | { | |
241 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
242 | return 0; | |
243 | ||
244 | memcpy(s->buffer + s->len, mem, len); | |
245 | s->len += len; | |
246 | ||
247 | return len; | |
248 | } | |
249 | ||
5e3ca0ec IM |
250 | #define HEX_CHARS 17 |
251 | ||
e309b41d | 252 | static int |
5e3ca0ec IM |
253 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
254 | { | |
255 | unsigned char hex[HEX_CHARS]; | |
256 | unsigned char *data; | |
257 | unsigned char byte; | |
258 | int i, j; | |
259 | ||
260 | BUG_ON(len >= HEX_CHARS); | |
261 | ||
262 | data = mem; | |
263 | ||
264 | #ifdef __BIG_ENDIAN | |
265 | for (i = 0, j = 0; i < len; i++) { | |
266 | #else | |
267 | for (i = len-1, j = 0; i >= 0; i--) { | |
268 | #endif | |
269 | byte = data[i]; | |
270 | ||
271 | hex[j] = byte & 0x0f; | |
272 | if (hex[j] >= 10) | |
273 | hex[j] += 'a' - 10; | |
274 | else | |
275 | hex[j] += '0'; | |
276 | j++; | |
277 | ||
278 | hex[j] = byte >> 4; | |
279 | if (hex[j] >= 10) | |
280 | hex[j] += 'a' - 10; | |
281 | else | |
282 | hex[j] += '0'; | |
283 | j++; | |
284 | } | |
285 | hex[j] = ' '; | |
286 | j++; | |
287 | ||
288 | return trace_seq_putmem(s, hex, j); | |
289 | } | |
290 | ||
e309b41d | 291 | static void |
214023c3 SR |
292 | trace_seq_reset(struct trace_seq *s) |
293 | { | |
294 | s->len = 0; | |
295 | } | |
296 | ||
e309b41d | 297 | static void |
214023c3 SR |
298 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
299 | { | |
300 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
301 | ||
302 | s->buffer[len] = 0; | |
303 | seq_puts(m, s->buffer); | |
304 | ||
305 | trace_seq_reset(s); | |
306 | } | |
307 | ||
e309b41d | 308 | static void |
c7aafc54 IM |
309 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
310 | { | |
311 | struct list_head flip_pages; | |
312 | ||
313 | INIT_LIST_HEAD(&flip_pages); | |
314 | ||
93a588f4 | 315 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
c7aafc54 | 316 | sizeof(struct trace_array_cpu) - |
93a588f4 | 317 | offsetof(struct trace_array_cpu, trace_head_idx)); |
c7aafc54 IM |
318 | |
319 | check_pages(tr1); | |
320 | check_pages(tr2); | |
321 | list_splice_init(&tr1->trace_pages, &flip_pages); | |
322 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); | |
323 | list_splice_init(&flip_pages, &tr2->trace_pages); | |
324 | BUG_ON(!list_empty(&flip_pages)); | |
325 | check_pages(tr1); | |
326 | check_pages(tr2); | |
327 | } | |
328 | ||
e309b41d | 329 | void |
bc0c38d1 SR |
330 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
331 | { | |
332 | struct trace_array_cpu *data; | |
bc0c38d1 SR |
333 | int i; |
334 | ||
4c11d7ae SR |
335 | WARN_ON_ONCE(!irqs_disabled()); |
336 | spin_lock(&ftrace_max_lock); | |
bc0c38d1 SR |
337 | /* clear out all the previous traces */ |
338 | for_each_possible_cpu(i) { | |
339 | data = tr->data[i]; | |
c7aafc54 | 340 | flip_trace(max_tr.data[i], data); |
89b2f978 | 341 | tracing_reset(data); |
bc0c38d1 SR |
342 | } |
343 | ||
344 | __update_max_tr(tr, tsk, cpu); | |
4c11d7ae | 345 | spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
346 | } |
347 | ||
348 | /** | |
349 | * update_max_tr_single - only copy one trace over, and reset the rest | |
350 | * @tr - tracer | |
351 | * @tsk - task with the latency | |
352 | * @cpu - the cpu of the buffer to copy. | |
353 | */ | |
e309b41d | 354 | void |
bc0c38d1 SR |
355 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
356 | { | |
357 | struct trace_array_cpu *data = tr->data[cpu]; | |
bc0c38d1 SR |
358 | int i; |
359 | ||
4c11d7ae SR |
360 | WARN_ON_ONCE(!irqs_disabled()); |
361 | spin_lock(&ftrace_max_lock); | |
bc0c38d1 SR |
362 | for_each_possible_cpu(i) |
363 | tracing_reset(max_tr.data[i]); | |
364 | ||
c7aafc54 | 365 | flip_trace(max_tr.data[cpu], data); |
89b2f978 | 366 | tracing_reset(data); |
bc0c38d1 SR |
367 | |
368 | __update_max_tr(tr, tsk, cpu); | |
4c11d7ae | 369 | spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
370 | } |
371 | ||
372 | int register_tracer(struct tracer *type) | |
373 | { | |
374 | struct tracer *t; | |
375 | int len; | |
376 | int ret = 0; | |
377 | ||
378 | if (!type->name) { | |
379 | pr_info("Tracer must have a name\n"); | |
380 | return -1; | |
381 | } | |
382 | ||
383 | mutex_lock(&trace_types_lock); | |
384 | for (t = trace_types; t; t = t->next) { | |
385 | if (strcmp(type->name, t->name) == 0) { | |
386 | /* already found */ | |
387 | pr_info("Trace %s already registered\n", | |
388 | type->name); | |
389 | ret = -1; | |
390 | goto out; | |
391 | } | |
392 | } | |
393 | ||
60a11774 SR |
394 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
395 | if (type->selftest) { | |
396 | struct tracer *saved_tracer = current_trace; | |
397 | struct trace_array_cpu *data; | |
398 | struct trace_array *tr = &global_trace; | |
399 | int saved_ctrl = tr->ctrl; | |
400 | int i; | |
401 | /* | |
402 | * Run a selftest on this tracer. | |
403 | * Here we reset the trace buffer, and set the current | |
404 | * tracer to be this tracer. The tracer can then run some | |
405 | * internal tracing to verify that everything is in order. | |
406 | * If we fail, we do not register this tracer. | |
407 | */ | |
408 | for_each_possible_cpu(i) { | |
60a11774 | 409 | data = tr->data[i]; |
c7aafc54 IM |
410 | if (!head_page(data)) |
411 | continue; | |
60a11774 SR |
412 | tracing_reset(data); |
413 | } | |
414 | current_trace = type; | |
415 | tr->ctrl = 0; | |
416 | /* the test is responsible for initializing and enabling */ | |
417 | pr_info("Testing tracer %s: ", type->name); | |
418 | ret = type->selftest(type, tr); | |
419 | /* the test is responsible for resetting too */ | |
420 | current_trace = saved_tracer; | |
421 | tr->ctrl = saved_ctrl; | |
422 | if (ret) { | |
423 | printk(KERN_CONT "FAILED!\n"); | |
424 | goto out; | |
425 | } | |
1d4db00a SR |
426 | /* Only reset on passing, to avoid touching corrupted buffers */ |
427 | for_each_possible_cpu(i) { | |
428 | data = tr->data[i]; | |
429 | if (!head_page(data)) | |
430 | continue; | |
431 | tracing_reset(data); | |
432 | } | |
60a11774 SR |
433 | printk(KERN_CONT "PASSED\n"); |
434 | } | |
435 | #endif | |
436 | ||
bc0c38d1 SR |
437 | type->next = trace_types; |
438 | trace_types = type; | |
439 | len = strlen(type->name); | |
440 | if (len > max_tracer_type_len) | |
441 | max_tracer_type_len = len; | |
60a11774 | 442 | |
bc0c38d1 SR |
443 | out: |
444 | mutex_unlock(&trace_types_lock); | |
445 | ||
446 | return ret; | |
447 | } | |
448 | ||
449 | void unregister_tracer(struct tracer *type) | |
450 | { | |
451 | struct tracer **t; | |
452 | int len; | |
453 | ||
454 | mutex_lock(&trace_types_lock); | |
455 | for (t = &trace_types; *t; t = &(*t)->next) { | |
456 | if (*t == type) | |
457 | goto found; | |
458 | } | |
459 | pr_info("Trace %s not registered\n", type->name); | |
460 | goto out; | |
461 | ||
462 | found: | |
463 | *t = (*t)->next; | |
464 | if (strlen(type->name) != max_tracer_type_len) | |
465 | goto out; | |
466 | ||
467 | max_tracer_type_len = 0; | |
468 | for (t = &trace_types; *t; t = &(*t)->next) { | |
469 | len = strlen((*t)->name); | |
470 | if (len > max_tracer_type_len) | |
471 | max_tracer_type_len = len; | |
472 | } | |
473 | out: | |
474 | mutex_unlock(&trace_types_lock); | |
475 | } | |
476 | ||
e309b41d | 477 | void tracing_reset(struct trace_array_cpu *data) |
bc0c38d1 SR |
478 | { |
479 | data->trace_idx = 0; | |
93a588f4 SR |
480 | data->trace_head = data->trace_tail = head_page(data); |
481 | data->trace_head_idx = 0; | |
482 | data->trace_tail_idx = 0; | |
bc0c38d1 SR |
483 | } |
484 | ||
bc0c38d1 SR |
485 | #define SAVED_CMDLINES 128 |
486 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
487 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
488 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
489 | static int cmdline_idx; | |
490 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
491 | atomic_t trace_record_cmdline_disabled; | |
492 | ||
493 | static void trace_init_cmdlines(void) | |
494 | { | |
495 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
496 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
497 | cmdline_idx = 0; | |
498 | } | |
499 | ||
e309b41d | 500 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 501 | |
e309b41d | 502 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
503 | { |
504 | unsigned map; | |
505 | unsigned idx; | |
506 | ||
507 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
508 | return; | |
509 | ||
510 | /* | |
511 | * It's not the end of the world if we don't get | |
512 | * the lock, but we also don't want to spin | |
513 | * nor do we want to disable interrupts, | |
514 | * so if we miss here, then better luck next time. | |
515 | */ | |
516 | if (!spin_trylock(&trace_cmdline_lock)) | |
517 | return; | |
518 | ||
519 | idx = map_pid_to_cmdline[tsk->pid]; | |
520 | if (idx >= SAVED_CMDLINES) { | |
521 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
522 | ||
523 | map = map_cmdline_to_pid[idx]; | |
524 | if (map <= PID_MAX_DEFAULT) | |
525 | map_pid_to_cmdline[map] = (unsigned)-1; | |
526 | ||
527 | map_pid_to_cmdline[tsk->pid] = idx; | |
528 | ||
529 | cmdline_idx = idx; | |
530 | } | |
531 | ||
532 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
533 | ||
534 | spin_unlock(&trace_cmdline_lock); | |
535 | } | |
536 | ||
e309b41d | 537 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
538 | { |
539 | char *cmdline = "<...>"; | |
540 | unsigned map; | |
541 | ||
542 | if (!pid) | |
543 | return "<idle>"; | |
544 | ||
545 | if (pid > PID_MAX_DEFAULT) | |
546 | goto out; | |
547 | ||
548 | map = map_pid_to_cmdline[pid]; | |
549 | if (map >= SAVED_CMDLINES) | |
550 | goto out; | |
551 | ||
552 | cmdline = saved_cmdlines[map]; | |
553 | ||
554 | out: | |
555 | return cmdline; | |
556 | } | |
557 | ||
e309b41d | 558 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
559 | { |
560 | if (atomic_read(&trace_record_cmdline_disabled)) | |
561 | return; | |
562 | ||
563 | trace_save_cmdline(tsk); | |
564 | } | |
565 | ||
e309b41d | 566 | static inline struct list_head * |
93a588f4 SR |
567 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
568 | { | |
569 | /* | |
570 | * Roundrobin - but skip the head (which is not a real page): | |
571 | */ | |
572 | next = next->next; | |
573 | if (unlikely(next == &data->trace_pages)) | |
574 | next = next->next; | |
575 | BUG_ON(next == &data->trace_pages); | |
576 | ||
577 | return next; | |
578 | } | |
579 | ||
e309b41d | 580 | static inline void * |
93a588f4 SR |
581 | trace_next_page(struct trace_array_cpu *data, void *addr) |
582 | { | |
583 | struct list_head *next; | |
584 | struct page *page; | |
585 | ||
586 | page = virt_to_page(addr); | |
587 | ||
588 | next = trace_next_list(data, &page->lru); | |
589 | page = list_entry(next, struct page, lru); | |
590 | ||
591 | return page_address(page); | |
592 | } | |
593 | ||
e309b41d | 594 | static inline struct trace_entry * |
c7aafc54 | 595 | tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data) |
bc0c38d1 SR |
596 | { |
597 | unsigned long idx, idx_next; | |
598 | struct trace_entry *entry; | |
599 | ||
4c11d7ae | 600 | data->trace_idx++; |
93a588f4 | 601 | idx = data->trace_head_idx; |
bc0c38d1 SR |
602 | idx_next = idx + 1; |
603 | ||
c7aafc54 IM |
604 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
605 | ||
93a588f4 | 606 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
4c11d7ae SR |
607 | |
608 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { | |
93a588f4 | 609 | data->trace_head = trace_next_page(data, data->trace_head); |
bc0c38d1 SR |
610 | idx_next = 0; |
611 | } | |
612 | ||
93a588f4 SR |
613 | if (data->trace_head == data->trace_tail && |
614 | idx_next == data->trace_tail_idx) { | |
615 | /* overrun */ | |
616 | data->trace_tail_idx++; | |
617 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
618 | data->trace_tail = | |
619 | trace_next_page(data, data->trace_tail); | |
620 | data->trace_tail_idx = 0; | |
621 | } | |
622 | } | |
623 | ||
624 | data->trace_head_idx = idx_next; | |
bc0c38d1 SR |
625 | |
626 | return entry; | |
627 | } | |
628 | ||
e309b41d | 629 | static inline void |
c7aafc54 | 630 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
bc0c38d1 SR |
631 | { |
632 | struct task_struct *tsk = current; | |
633 | unsigned long pc; | |
634 | ||
635 | pc = preempt_count(); | |
636 | ||
c7aafc54 IM |
637 | entry->preempt_count = pc & 0xff; |
638 | entry->pid = tsk->pid; | |
750ed1a4 | 639 | entry->t = ftrace_now(raw_smp_processor_id()); |
bc0c38d1 SR |
640 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
641 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | | |
642 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
643 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
644 | } | |
645 | ||
e309b41d | 646 | void |
6fb44b71 SR |
647 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
648 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
bc0c38d1 SR |
649 | { |
650 | struct trace_entry *entry; | |
dcb6308f | 651 | unsigned long irq_flags; |
bc0c38d1 | 652 | |
dcb6308f | 653 | spin_lock_irqsave(&data->lock, irq_flags); |
c7aafc54 | 654 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 | 655 | tracing_generic_entry_update(entry, flags); |
c7aafc54 IM |
656 | entry->type = TRACE_FN; |
657 | entry->fn.ip = ip; | |
658 | entry->fn.parent_ip = parent_ip; | |
dcb6308f | 659 | spin_unlock_irqrestore(&data->lock, irq_flags); |
bc0c38d1 SR |
660 | } |
661 | ||
e309b41d | 662 | void |
2e0f5761 IM |
663 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
664 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
665 | { | |
666 | if (likely(!atomic_read(&data->disabled))) | |
6fb44b71 | 667 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
668 | } |
669 | ||
4e655519 IM |
670 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER |
671 | ||
e309b41d | 672 | void |
4e655519 IM |
673 | __trace_special(void *__tr, void *__data, |
674 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
f0a920d5 | 675 | { |
4e655519 IM |
676 | struct trace_array_cpu *data = __data; |
677 | struct trace_array *tr = __tr; | |
f0a920d5 | 678 | struct trace_entry *entry; |
dcb6308f | 679 | unsigned long irq_flags; |
f0a920d5 | 680 | |
dcb6308f | 681 | spin_lock_irqsave(&data->lock, irq_flags); |
f0a920d5 IM |
682 | entry = tracing_get_trace_entry(tr, data); |
683 | tracing_generic_entry_update(entry, 0); | |
684 | entry->type = TRACE_SPECIAL; | |
685 | entry->special.arg1 = arg1; | |
686 | entry->special.arg2 = arg2; | |
687 | entry->special.arg3 = arg3; | |
dcb6308f | 688 | spin_unlock_irqrestore(&data->lock, irq_flags); |
86387f7e IM |
689 | } |
690 | ||
4e655519 IM |
691 | #endif |
692 | ||
86387f7e IM |
693 | void __trace_stack(struct trace_array *tr, |
694 | struct trace_array_cpu *data, | |
695 | unsigned long flags, | |
696 | int skip) | |
697 | { | |
698 | struct trace_entry *entry; | |
699 | struct stack_trace trace; | |
700 | ||
701 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
702 | return; | |
703 | ||
704 | entry = tracing_get_trace_entry(tr, data); | |
705 | tracing_generic_entry_update(entry, flags); | |
706 | entry->type = TRACE_STACK; | |
707 | ||
708 | memset(&entry->stack, 0, sizeof(entry->stack)); | |
709 | ||
710 | trace.nr_entries = 0; | |
711 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
712 | trace.skip = skip; | |
713 | trace.entries = entry->stack.caller; | |
714 | ||
715 | save_stack_trace(&trace); | |
f0a920d5 IM |
716 | } |
717 | ||
e309b41d | 718 | void |
bc0c38d1 SR |
719 | tracing_sched_switch_trace(struct trace_array *tr, |
720 | struct trace_array_cpu *data, | |
86387f7e IM |
721 | struct task_struct *prev, |
722 | struct task_struct *next, | |
bc0c38d1 SR |
723 | unsigned long flags) |
724 | { | |
725 | struct trace_entry *entry; | |
dcb6308f | 726 | unsigned long irq_flags; |
bc0c38d1 | 727 | |
dcb6308f | 728 | spin_lock_irqsave(&data->lock, irq_flags); |
c7aafc54 | 729 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 SR |
730 | tracing_generic_entry_update(entry, flags); |
731 | entry->type = TRACE_CTX; | |
732 | entry->ctx.prev_pid = prev->pid; | |
733 | entry->ctx.prev_prio = prev->prio; | |
734 | entry->ctx.prev_state = prev->state; | |
735 | entry->ctx.next_pid = next->pid; | |
736 | entry->ctx.next_prio = next->prio; | |
86387f7e | 737 | __trace_stack(tr, data, flags, 4); |
dcb6308f | 738 | spin_unlock_irqrestore(&data->lock, irq_flags); |
bc0c38d1 SR |
739 | } |
740 | ||
57422797 IM |
741 | void |
742 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
743 | struct trace_array_cpu *data, | |
86387f7e IM |
744 | struct task_struct *wakee, |
745 | struct task_struct *curr, | |
57422797 IM |
746 | unsigned long flags) |
747 | { | |
748 | struct trace_entry *entry; | |
749 | unsigned long irq_flags; | |
750 | ||
751 | spin_lock_irqsave(&data->lock, irq_flags); | |
752 | entry = tracing_get_trace_entry(tr, data); | |
753 | tracing_generic_entry_update(entry, flags); | |
754 | entry->type = TRACE_WAKE; | |
755 | entry->ctx.prev_pid = curr->pid; | |
756 | entry->ctx.prev_prio = curr->prio; | |
757 | entry->ctx.prev_state = curr->state; | |
758 | entry->ctx.next_pid = wakee->pid; | |
759 | entry->ctx.next_prio = wakee->prio; | |
86387f7e | 760 | __trace_stack(tr, data, flags, 5); |
57422797 | 761 | spin_unlock_irqrestore(&data->lock, irq_flags); |
57422797 IM |
762 | } |
763 | ||
2e0f5761 | 764 | #ifdef CONFIG_FTRACE |
e309b41d | 765 | static void |
2e0f5761 IM |
766 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
767 | { | |
768 | struct trace_array *tr = &global_trace; | |
769 | struct trace_array_cpu *data; | |
770 | unsigned long flags; | |
771 | long disabled; | |
772 | int cpu; | |
773 | ||
774 | if (unlikely(!tracer_enabled)) | |
775 | return; | |
776 | ||
777 | local_irq_save(flags); | |
778 | cpu = raw_smp_processor_id(); | |
779 | data = tr->data[cpu]; | |
780 | disabled = atomic_inc_return(&data->disabled); | |
781 | ||
782 | if (likely(disabled == 1)) | |
6fb44b71 | 783 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
784 | |
785 | atomic_dec(&data->disabled); | |
786 | local_irq_restore(flags); | |
787 | } | |
788 | ||
789 | static struct ftrace_ops trace_ops __read_mostly = | |
790 | { | |
791 | .func = function_trace_call, | |
792 | }; | |
793 | ||
e309b41d | 794 | void tracing_start_function_trace(void) |
2e0f5761 IM |
795 | { |
796 | register_ftrace_function(&trace_ops); | |
797 | } | |
798 | ||
e309b41d | 799 | void tracing_stop_function_trace(void) |
2e0f5761 IM |
800 | { |
801 | unregister_ftrace_function(&trace_ops); | |
802 | } | |
803 | #endif | |
804 | ||
bc0c38d1 SR |
805 | enum trace_file_type { |
806 | TRACE_FILE_LAT_FMT = 1, | |
807 | }; | |
808 | ||
809 | static struct trace_entry * | |
4c11d7ae SR |
810 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
811 | struct trace_iterator *iter, int cpu) | |
bc0c38d1 | 812 | { |
4c11d7ae SR |
813 | struct page *page; |
814 | struct trace_entry *array; | |
bc0c38d1 | 815 | |
4c11d7ae | 816 | if (iter->next_idx[cpu] >= tr->entries || |
b3806b43 SR |
817 | iter->next_idx[cpu] >= data->trace_idx || |
818 | (data->trace_head == data->trace_tail && | |
819 | data->trace_head_idx == data->trace_tail_idx)) | |
bc0c38d1 SR |
820 | return NULL; |
821 | ||
4c11d7ae | 822 | if (!iter->next_page[cpu]) { |
93a588f4 SR |
823 | /* Initialize the iterator for this cpu trace buffer */ |
824 | WARN_ON(!data->trace_tail); | |
825 | page = virt_to_page(data->trace_tail); | |
826 | iter->next_page[cpu] = &page->lru; | |
827 | iter->next_page_idx[cpu] = data->trace_tail_idx; | |
4c11d7ae | 828 | } |
bc0c38d1 | 829 | |
4c11d7ae | 830 | page = list_entry(iter->next_page[cpu], struct page, lru); |
c7aafc54 IM |
831 | BUG_ON(&data->trace_pages == &page->lru); |
832 | ||
4c11d7ae SR |
833 | array = page_address(page); |
834 | ||
93a588f4 | 835 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
4c11d7ae | 836 | return &array[iter->next_page_idx[cpu]]; |
bc0c38d1 SR |
837 | } |
838 | ||
e309b41d | 839 | static struct trace_entry * |
bc0c38d1 SR |
840 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
841 | { | |
842 | struct trace_array *tr = iter->tr; | |
843 | struct trace_entry *ent, *next = NULL; | |
844 | int next_cpu = -1; | |
845 | int cpu; | |
846 | ||
847 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 848 | if (!head_page(tr->data[cpu])) |
bc0c38d1 | 849 | continue; |
4c11d7ae | 850 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
cdd31cd2 IM |
851 | /* |
852 | * Pick the entry with the smallest timestamp: | |
853 | */ | |
854 | if (ent && (!next || ent->t < next->t)) { | |
bc0c38d1 SR |
855 | next = ent; |
856 | next_cpu = cpu; | |
857 | } | |
858 | } | |
859 | ||
860 | if (ent_cpu) | |
861 | *ent_cpu = next_cpu; | |
862 | ||
863 | return next; | |
864 | } | |
865 | ||
e309b41d | 866 | static void trace_iterator_increment(struct trace_iterator *iter) |
bc0c38d1 | 867 | { |
b3806b43 SR |
868 | iter->idx++; |
869 | iter->next_idx[iter->cpu]++; | |
870 | iter->next_page_idx[iter->cpu]++; | |
8c523a9d | 871 | |
b3806b43 SR |
872 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
873 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
bc0c38d1 | 874 | |
b3806b43 SR |
875 | iter->next_page_idx[iter->cpu] = 0; |
876 | iter->next_page[iter->cpu] = | |
877 | trace_next_list(data, iter->next_page[iter->cpu]); | |
878 | } | |
879 | } | |
bc0c38d1 | 880 | |
e309b41d | 881 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 SR |
882 | { |
883 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
884 | ||
885 | data->trace_tail_idx++; | |
886 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
887 | data->trace_tail = trace_next_page(data, data->trace_tail); | |
888 | data->trace_tail_idx = 0; | |
889 | } | |
4e3c3333 | 890 | |
b3806b43 SR |
891 | /* Check if we empty it, then reset the index */ |
892 | if (data->trace_head == data->trace_tail && | |
893 | data->trace_head_idx == data->trace_tail_idx) | |
894 | data->trace_idx = 0; | |
b3806b43 SR |
895 | } |
896 | ||
e309b41d | 897 | static void *find_next_entry_inc(struct trace_iterator *iter) |
b3806b43 SR |
898 | { |
899 | struct trace_entry *next; | |
900 | int next_cpu = -1; | |
901 | ||
902 | next = find_next_entry(iter, &next_cpu); | |
93a588f4 | 903 | |
4e3c3333 IM |
904 | iter->prev_ent = iter->ent; |
905 | iter->prev_cpu = iter->cpu; | |
906 | ||
bc0c38d1 SR |
907 | iter->ent = next; |
908 | iter->cpu = next_cpu; | |
909 | ||
b3806b43 SR |
910 | if (next) |
911 | trace_iterator_increment(iter); | |
912 | ||
bc0c38d1 SR |
913 | return next ? iter : NULL; |
914 | } | |
915 | ||
e309b41d | 916 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
917 | { |
918 | struct trace_iterator *iter = m->private; | |
bc0c38d1 SR |
919 | void *last_ent = iter->ent; |
920 | int i = (int)*pos; | |
4e3c3333 | 921 | void *ent; |
bc0c38d1 SR |
922 | |
923 | (*pos)++; | |
924 | ||
925 | /* can't go backwards */ | |
926 | if (iter->idx > i) | |
927 | return NULL; | |
928 | ||
929 | if (iter->idx < 0) | |
930 | ent = find_next_entry_inc(iter); | |
931 | else | |
932 | ent = iter; | |
933 | ||
934 | while (ent && iter->idx < i) | |
935 | ent = find_next_entry_inc(iter); | |
936 | ||
937 | iter->pos = *pos; | |
938 | ||
939 | if (last_ent && !ent) | |
940 | seq_puts(m, "\n\nvim:ft=help\n"); | |
941 | ||
942 | return ent; | |
943 | } | |
944 | ||
945 | static void *s_start(struct seq_file *m, loff_t *pos) | |
946 | { | |
947 | struct trace_iterator *iter = m->private; | |
948 | void *p = NULL; | |
949 | loff_t l = 0; | |
950 | int i; | |
951 | ||
952 | mutex_lock(&trace_types_lock); | |
953 | ||
954 | if (!current_trace || current_trace != iter->trace) | |
955 | return NULL; | |
956 | ||
957 | atomic_inc(&trace_record_cmdline_disabled); | |
958 | ||
959 | /* let the tracer grab locks here if needed */ | |
960 | if (current_trace->start) | |
961 | current_trace->start(iter); | |
962 | ||
963 | if (*pos != iter->pos) { | |
964 | iter->ent = NULL; | |
965 | iter->cpu = 0; | |
966 | iter->idx = -1; | |
4e3c3333 IM |
967 | iter->prev_ent = NULL; |
968 | iter->prev_cpu = -1; | |
bc0c38d1 | 969 | |
4c11d7ae | 970 | for_each_possible_cpu(i) { |
bc0c38d1 | 971 | iter->next_idx[i] = 0; |
4c11d7ae SR |
972 | iter->next_page[i] = NULL; |
973 | } | |
bc0c38d1 SR |
974 | |
975 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) | |
976 | ; | |
977 | ||
978 | } else { | |
4c11d7ae | 979 | l = *pos - 1; |
bc0c38d1 SR |
980 | p = s_next(m, p, &l); |
981 | } | |
982 | ||
983 | return p; | |
984 | } | |
985 | ||
986 | static void s_stop(struct seq_file *m, void *p) | |
987 | { | |
988 | struct trace_iterator *iter = m->private; | |
989 | ||
990 | atomic_dec(&trace_record_cmdline_disabled); | |
991 | ||
992 | /* let the tracer release locks here if needed */ | |
993 | if (current_trace && current_trace == iter->trace && iter->trace->stop) | |
994 | iter->trace->stop(iter); | |
995 | ||
996 | mutex_unlock(&trace_types_lock); | |
997 | } | |
998 | ||
b3806b43 | 999 | static int |
214023c3 | 1000 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1001 | { |
1002 | #ifdef CONFIG_KALLSYMS | |
1003 | char str[KSYM_SYMBOL_LEN]; | |
1004 | ||
1005 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1006 | ||
b3806b43 | 1007 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1008 | #endif |
b3806b43 | 1009 | return 1; |
bc0c38d1 SR |
1010 | } |
1011 | ||
b3806b43 | 1012 | static int |
214023c3 SR |
1013 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1014 | unsigned long address) | |
bc0c38d1 SR |
1015 | { |
1016 | #ifdef CONFIG_KALLSYMS | |
1017 | char str[KSYM_SYMBOL_LEN]; | |
1018 | ||
1019 | sprint_symbol(str, address); | |
b3806b43 | 1020 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1021 | #endif |
b3806b43 | 1022 | return 1; |
bc0c38d1 SR |
1023 | } |
1024 | ||
1025 | #ifndef CONFIG_64BIT | |
1026 | # define IP_FMT "%08lx" | |
1027 | #else | |
1028 | # define IP_FMT "%016lx" | |
1029 | #endif | |
1030 | ||
e309b41d | 1031 | static int |
214023c3 | 1032 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1033 | { |
b3806b43 SR |
1034 | int ret; |
1035 | ||
1036 | if (!ip) | |
1037 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1038 | |
1039 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1040 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1041 | else |
b3806b43 SR |
1042 | ret = seq_print_sym_short(s, "%s", ip); |
1043 | ||
1044 | if (!ret) | |
1045 | return 0; | |
bc0c38d1 SR |
1046 | |
1047 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1048 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1049 | return ret; | |
bc0c38d1 SR |
1050 | } |
1051 | ||
e309b41d | 1052 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 SR |
1053 | { |
1054 | seq_puts(m, "# _------=> CPU# \n"); | |
1055 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1056 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1057 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1058 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1059 | seq_puts(m, "# |||| / \n"); | |
1060 | seq_puts(m, "# ||||| delay \n"); | |
1061 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1062 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
1063 | } | |
1064 | ||
e309b41d | 1065 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 SR |
1066 | { |
1067 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); | |
1068 | seq_puts(m, "# | | | | |\n"); | |
1069 | } | |
1070 | ||
1071 | ||
e309b41d | 1072 | static void |
bc0c38d1 SR |
1073 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1074 | { | |
1075 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1076 | struct trace_array *tr = iter->tr; | |
1077 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1078 | struct tracer *type = current_trace; | |
4c11d7ae SR |
1079 | unsigned long total = 0; |
1080 | unsigned long entries = 0; | |
bc0c38d1 SR |
1081 | int cpu; |
1082 | const char *name = "preemption"; | |
1083 | ||
1084 | if (type) | |
1085 | name = type->name; | |
1086 | ||
1087 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 1088 | if (head_page(tr->data[cpu])) { |
4c11d7ae SR |
1089 | total += tr->data[cpu]->trace_idx; |
1090 | if (tr->data[cpu]->trace_idx > tr->entries) | |
bc0c38d1 | 1091 | entries += tr->entries; |
4c11d7ae | 1092 | else |
bc0c38d1 SR |
1093 | entries += tr->data[cpu]->trace_idx; |
1094 | } | |
1095 | } | |
1096 | ||
1097 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1098 | name, UTS_RELEASE); | |
1099 | seq_puts(m, "-----------------------------------" | |
1100 | "---------------------------------\n"); | |
1101 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1102 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1103 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1104 | entries, |
4c11d7ae | 1105 | total, |
bc0c38d1 SR |
1106 | tr->cpu, |
1107 | #if defined(CONFIG_PREEMPT_NONE) | |
1108 | "server", | |
1109 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1110 | "desktop", | |
1111 | #elif defined(CONFIG_PREEMPT_DESKTOP) | |
1112 | "preempt", | |
1113 | #else | |
1114 | "unknown", | |
1115 | #endif | |
1116 | /* These are reserved for later use */ | |
1117 | 0, 0, 0, 0); | |
1118 | #ifdef CONFIG_SMP | |
1119 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1120 | #else | |
1121 | seq_puts(m, ")\n"); | |
1122 | #endif | |
1123 | seq_puts(m, " -----------------\n"); | |
1124 | seq_printf(m, " | task: %.16s-%d " | |
1125 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1126 | data->comm, data->pid, data->uid, data->nice, | |
1127 | data->policy, data->rt_priority); | |
1128 | seq_puts(m, " -----------------\n"); | |
1129 | ||
1130 | if (data->critical_start) { | |
1131 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1132 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1133 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1134 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1135 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1136 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1137 | seq_puts(m, "\n"); |
1138 | } | |
1139 | ||
1140 | seq_puts(m, "\n"); | |
1141 | } | |
1142 | ||
e309b41d | 1143 | static void |
214023c3 | 1144 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1145 | { |
1146 | int hardirq, softirq; | |
1147 | char *comm; | |
1148 | ||
1149 | comm = trace_find_cmdline(entry->pid); | |
1150 | ||
214023c3 SR |
1151 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
1152 | trace_seq_printf(s, "%d", cpu); | |
1153 | trace_seq_printf(s, "%c%c", | |
1154 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', | |
1155 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); | |
bc0c38d1 SR |
1156 | |
1157 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; | |
1158 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
1159 | if (hardirq && softirq) | |
214023c3 | 1160 | trace_seq_putc(s, 'H'); |
bc0c38d1 SR |
1161 | else { |
1162 | if (hardirq) | |
214023c3 | 1163 | trace_seq_putc(s, 'h'); |
bc0c38d1 SR |
1164 | else { |
1165 | if (softirq) | |
214023c3 | 1166 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1167 | else |
214023c3 | 1168 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1169 | } |
1170 | } | |
1171 | ||
1172 | if (entry->preempt_count) | |
214023c3 | 1173 | trace_seq_printf(s, "%x", entry->preempt_count); |
bc0c38d1 | 1174 | else |
214023c3 | 1175 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1176 | } |
1177 | ||
1178 | unsigned long preempt_mark_thresh = 100; | |
1179 | ||
e309b41d | 1180 | static void |
214023c3 | 1181 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
bc0c38d1 SR |
1182 | unsigned long rel_usecs) |
1183 | { | |
214023c3 | 1184 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1185 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1186 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1187 | else if (rel_usecs > 1) |
214023c3 | 1188 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1189 | else |
214023c3 | 1190 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1191 | } |
1192 | ||
1193 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1194 | ||
e309b41d | 1195 | static int |
214023c3 | 1196 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1197 | { |
214023c3 | 1198 | struct trace_seq *s = &iter->seq; |
bc0c38d1 SR |
1199 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
1200 | struct trace_entry *next_entry = find_next_entry(iter, NULL); | |
1201 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); | |
1202 | struct trace_entry *entry = iter->ent; | |
1203 | unsigned long abs_usecs; | |
1204 | unsigned long rel_usecs; | |
1205 | char *comm; | |
1206 | int S; | |
86387f7e | 1207 | int i; |
bc0c38d1 SR |
1208 | |
1209 | if (!next_entry) | |
1210 | next_entry = entry; | |
1211 | rel_usecs = ns2usecs(next_entry->t - entry->t); | |
1212 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); | |
1213 | ||
1214 | if (verbose) { | |
1215 | comm = trace_find_cmdline(entry->pid); | |
214023c3 SR |
1216 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
1217 | " %ld.%03ldms (+%ld.%03ldms): ", | |
1218 | comm, | |
1219 | entry->pid, cpu, entry->flags, | |
1220 | entry->preempt_count, trace_idx, | |
1221 | ns2usecs(entry->t), | |
1222 | abs_usecs/1000, | |
1223 | abs_usecs % 1000, rel_usecs/1000, | |
1224 | rel_usecs % 1000); | |
bc0c38d1 | 1225 | } else { |
86387f7e IM |
1226 | if (entry->type != TRACE_STACK) { |
1227 | lat_print_generic(s, entry, cpu); | |
1228 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
1229 | } | |
bc0c38d1 SR |
1230 | } |
1231 | switch (entry->type) { | |
1232 | case TRACE_FN: | |
214023c3 SR |
1233 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1234 | trace_seq_puts(s, " ("); | |
1235 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); | |
1236 | trace_seq_puts(s, ")\n"); | |
bc0c38d1 SR |
1237 | break; |
1238 | case TRACE_CTX: | |
57422797 | 1239 | case TRACE_WAKE: |
bc0c38d1 SR |
1240 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1241 | state_to_char[entry->ctx.prev_state] : 'X'; | |
1242 | comm = trace_find_cmdline(entry->ctx.next_pid); | |
57422797 | 1243 | trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d %s\n", |
214023c3 SR |
1244 | entry->ctx.prev_pid, |
1245 | entry->ctx.prev_prio, | |
57422797 | 1246 | S, entry->type == TRACE_CTX ? "==>" : " +", |
214023c3 SR |
1247 | entry->ctx.next_pid, |
1248 | entry->ctx.next_prio, | |
1249 | comm); | |
bc0c38d1 | 1250 | break; |
f0a920d5 | 1251 | case TRACE_SPECIAL: |
4e655519 | 1252 | trace_seq_printf(s, " %ld %ld %ld\n", |
f0a920d5 IM |
1253 | entry->special.arg1, |
1254 | entry->special.arg2, | |
1255 | entry->special.arg3); | |
1256 | break; | |
86387f7e IM |
1257 | case TRACE_STACK: |
1258 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1259 | if (i) | |
1260 | trace_seq_puts(s, " <= "); | |
1261 | seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); | |
1262 | } | |
1263 | trace_seq_puts(s, "\n"); | |
1264 | break; | |
89b2f978 | 1265 | default: |
214023c3 | 1266 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1267 | } |
f9896bf3 | 1268 | return 1; |
bc0c38d1 SR |
1269 | } |
1270 | ||
e309b41d | 1271 | static int print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1272 | { |
214023c3 | 1273 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1274 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1275 | struct trace_entry *entry; |
bc0c38d1 SR |
1276 | unsigned long usec_rem; |
1277 | unsigned long long t; | |
1278 | unsigned long secs; | |
1279 | char *comm; | |
b3806b43 | 1280 | int ret; |
86387f7e IM |
1281 | int S; |
1282 | int i; | |
bc0c38d1 | 1283 | |
4e3c3333 IM |
1284 | entry = iter->ent; |
1285 | ||
bc0c38d1 SR |
1286 | comm = trace_find_cmdline(iter->ent->pid); |
1287 | ||
cdd31cd2 | 1288 | t = ns2usecs(entry->t); |
bc0c38d1 SR |
1289 | usec_rem = do_div(t, 1000000ULL); |
1290 | secs = (unsigned long)t; | |
1291 | ||
86387f7e IM |
1292 | if (entry->type != TRACE_STACK) { |
1293 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); | |
1294 | if (!ret) | |
1295 | return 0; | |
1296 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); | |
1297 | if (!ret) | |
1298 | return 0; | |
1299 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); | |
1300 | if (!ret) | |
1301 | return 0; | |
1302 | } | |
bc0c38d1 SR |
1303 | |
1304 | switch (entry->type) { | |
1305 | case TRACE_FN: | |
b3806b43 SR |
1306 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1307 | if (!ret) | |
1308 | return 0; | |
bc0c38d1 SR |
1309 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
1310 | entry->fn.parent_ip) { | |
b3806b43 SR |
1311 | ret = trace_seq_printf(s, " <-"); |
1312 | if (!ret) | |
1313 | return 0; | |
1314 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, | |
1315 | sym_flags); | |
1316 | if (!ret) | |
1317 | return 0; | |
bc0c38d1 | 1318 | } |
b3806b43 SR |
1319 | ret = trace_seq_printf(s, "\n"); |
1320 | if (!ret) | |
1321 | return 0; | |
bc0c38d1 SR |
1322 | break; |
1323 | case TRACE_CTX: | |
57422797 | 1324 | case TRACE_WAKE: |
bc0c38d1 SR |
1325 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1326 | state_to_char[entry->ctx.prev_state] : 'X'; | |
57422797 | 1327 | ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d\n", |
b3806b43 SR |
1328 | entry->ctx.prev_pid, |
1329 | entry->ctx.prev_prio, | |
1330 | S, | |
57422797 | 1331 | entry->type == TRACE_CTX ? "==>" : " +", |
b3806b43 SR |
1332 | entry->ctx.next_pid, |
1333 | entry->ctx.next_prio); | |
1334 | if (!ret) | |
1335 | return 0; | |
bc0c38d1 | 1336 | break; |
f0a920d5 | 1337 | case TRACE_SPECIAL: |
4e655519 | 1338 | ret = trace_seq_printf(s, " %ld %ld %ld\n", |
f0a920d5 IM |
1339 | entry->special.arg1, |
1340 | entry->special.arg2, | |
1341 | entry->special.arg3); | |
1342 | if (!ret) | |
1343 | return 0; | |
1344 | break; | |
86387f7e IM |
1345 | case TRACE_STACK: |
1346 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1347 | if (i) { | |
1348 | ret = trace_seq_puts(s, " <= "); | |
1349 | if (!ret) | |
1350 | return 0; | |
1351 | } | |
1352 | ret = seq_print_ip_sym(s, entry->stack.caller[i], | |
1353 | sym_flags); | |
1354 | if (!ret) | |
1355 | return 0; | |
1356 | } | |
1357 | ret = trace_seq_puts(s, "\n"); | |
1358 | if (!ret) | |
1359 | return 0; | |
1360 | break; | |
bc0c38d1 | 1361 | } |
b3806b43 | 1362 | return 1; |
bc0c38d1 SR |
1363 | } |
1364 | ||
e309b41d | 1365 | static int print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1366 | { |
1367 | struct trace_seq *s = &iter->seq; | |
1368 | struct trace_entry *entry; | |
1369 | int ret; | |
1370 | int S; | |
1371 | ||
1372 | entry = iter->ent; | |
1373 | ||
1374 | ret = trace_seq_printf(s, "%d %d %llu ", | |
1375 | entry->pid, iter->cpu, entry->t); | |
1376 | if (!ret) | |
1377 | return 0; | |
1378 | ||
1379 | switch (entry->type) { | |
1380 | case TRACE_FN: | |
1381 | ret = trace_seq_printf(s, "%x %x\n", | |
1382 | entry->fn.ip, entry->fn.parent_ip); | |
1383 | if (!ret) | |
1384 | return 0; | |
1385 | break; | |
1386 | case TRACE_CTX: | |
57422797 | 1387 | case TRACE_WAKE: |
f9896bf3 IM |
1388 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1389 | state_to_char[entry->ctx.prev_state] : 'X'; | |
57422797 IM |
1390 | if (entry->type == TRACE_WAKE) |
1391 | S = '+'; | |
f9896bf3 IM |
1392 | ret = trace_seq_printf(s, "%d %d %c %d %d\n", |
1393 | entry->ctx.prev_pid, | |
1394 | entry->ctx.prev_prio, | |
1395 | S, | |
1396 | entry->ctx.next_pid, | |
1397 | entry->ctx.next_prio); | |
1398 | if (!ret) | |
1399 | return 0; | |
1400 | break; | |
f0a920d5 | 1401 | case TRACE_SPECIAL: |
86387f7e | 1402 | case TRACE_STACK: |
4e655519 | 1403 | ret = trace_seq_printf(s, " %ld %ld %ld\n", |
f0a920d5 IM |
1404 | entry->special.arg1, |
1405 | entry->special.arg2, | |
1406 | entry->special.arg3); | |
1407 | if (!ret) | |
1408 | return 0; | |
1409 | break; | |
f9896bf3 IM |
1410 | } |
1411 | return 1; | |
1412 | } | |
1413 | ||
cb0f12aa IM |
1414 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1415 | do { \ | |
1416 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1417 | return 0; \ | |
1418 | } while (0) | |
1419 | ||
5e3ca0ec IM |
1420 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1421 | do { \ | |
1422 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ | |
1423 | return 0; \ | |
1424 | } while (0) | |
1425 | ||
e309b41d | 1426 | static int print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1427 | { |
1428 | struct trace_seq *s = &iter->seq; | |
1429 | unsigned char newline = '\n'; | |
1430 | struct trace_entry *entry; | |
1431 | int S; | |
1432 | ||
1433 | entry = iter->ent; | |
1434 | ||
1435 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); | |
1436 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); | |
1437 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); | |
1438 | ||
1439 | switch (entry->type) { | |
1440 | case TRACE_FN: | |
1441 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); | |
1442 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
1443 | break; | |
1444 | case TRACE_CTX: | |
57422797 | 1445 | case TRACE_WAKE: |
5e3ca0ec IM |
1446 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1447 | state_to_char[entry->ctx.prev_state] : 'X'; | |
57422797 IM |
1448 | if (entry->type == TRACE_WAKE) |
1449 | S = '+'; | |
5e3ca0ec IM |
1450 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
1451 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); | |
1452 | SEQ_PUT_HEX_FIELD_RET(s, S); | |
1453 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); | |
1454 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); | |
1455 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
1456 | break; | |
1457 | case TRACE_SPECIAL: | |
86387f7e | 1458 | case TRACE_STACK: |
5e3ca0ec IM |
1459 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
1460 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); | |
1461 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); | |
1462 | break; | |
1463 | } | |
1464 | SEQ_PUT_FIELD_RET(s, newline); | |
1465 | ||
1466 | return 1; | |
1467 | } | |
1468 | ||
e309b41d | 1469 | static int print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1470 | { |
1471 | struct trace_seq *s = &iter->seq; | |
1472 | struct trace_entry *entry; | |
1473 | ||
1474 | entry = iter->ent; | |
1475 | ||
1476 | SEQ_PUT_FIELD_RET(s, entry->pid); | |
1477 | SEQ_PUT_FIELD_RET(s, entry->cpu); | |
1478 | SEQ_PUT_FIELD_RET(s, entry->t); | |
1479 | ||
1480 | switch (entry->type) { | |
1481 | case TRACE_FN: | |
1482 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); | |
1483 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); | |
1484 | break; | |
1485 | case TRACE_CTX: | |
1486 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); | |
1487 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); | |
1488 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); | |
1489 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); | |
1490 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); | |
1491 | break; | |
f0a920d5 | 1492 | case TRACE_SPECIAL: |
86387f7e | 1493 | case TRACE_STACK: |
f0a920d5 IM |
1494 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); |
1495 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); | |
1496 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); | |
1497 | break; | |
cb0f12aa IM |
1498 | } |
1499 | return 1; | |
1500 | } | |
1501 | ||
bc0c38d1 SR |
1502 | static int trace_empty(struct trace_iterator *iter) |
1503 | { | |
1504 | struct trace_array_cpu *data; | |
1505 | int cpu; | |
1506 | ||
1507 | for_each_possible_cpu(cpu) { | |
1508 | data = iter->tr->data[cpu]; | |
1509 | ||
b3806b43 SR |
1510 | if (head_page(data) && data->trace_idx && |
1511 | (data->trace_tail != data->trace_head || | |
1512 | data->trace_tail_idx != data->trace_head_idx)) | |
bc0c38d1 SR |
1513 | return 0; |
1514 | } | |
1515 | return 1; | |
1516 | } | |
1517 | ||
f9896bf3 IM |
1518 | static int print_trace_line(struct trace_iterator *iter) |
1519 | { | |
cb0f12aa IM |
1520 | if (trace_flags & TRACE_ITER_BIN) |
1521 | return print_bin_fmt(iter); | |
1522 | ||
5e3ca0ec IM |
1523 | if (trace_flags & TRACE_ITER_HEX) |
1524 | return print_hex_fmt(iter); | |
1525 | ||
f9896bf3 IM |
1526 | if (trace_flags & TRACE_ITER_RAW) |
1527 | return print_raw_fmt(iter); | |
1528 | ||
1529 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1530 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1531 | ||
1532 | return print_trace_fmt(iter); | |
1533 | } | |
1534 | ||
bc0c38d1 SR |
1535 | static int s_show(struct seq_file *m, void *v) |
1536 | { | |
1537 | struct trace_iterator *iter = v; | |
1538 | ||
1539 | if (iter->ent == NULL) { | |
1540 | if (iter->tr) { | |
1541 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1542 | seq_puts(m, "#\n"); | |
1543 | } | |
1544 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
1545 | /* print nothing if the buffers are empty */ | |
1546 | if (trace_empty(iter)) | |
1547 | return 0; | |
1548 | print_trace_header(m, iter); | |
1549 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1550 | print_lat_help_header(m); | |
1551 | } else { | |
1552 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1553 | print_func_help_header(m); | |
1554 | } | |
1555 | } else { | |
f9896bf3 | 1556 | print_trace_line(iter); |
214023c3 | 1557 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1558 | } |
1559 | ||
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1564 | .start = s_start, |
1565 | .next = s_next, | |
1566 | .stop = s_stop, | |
1567 | .show = s_show, | |
bc0c38d1 SR |
1568 | }; |
1569 | ||
e309b41d | 1570 | static struct trace_iterator * |
bc0c38d1 SR |
1571 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
1572 | { | |
1573 | struct trace_iterator *iter; | |
1574 | ||
60a11774 SR |
1575 | if (tracing_disabled) { |
1576 | *ret = -ENODEV; | |
1577 | return NULL; | |
1578 | } | |
1579 | ||
bc0c38d1 SR |
1580 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1581 | if (!iter) { | |
1582 | *ret = -ENOMEM; | |
1583 | goto out; | |
1584 | } | |
1585 | ||
1586 | mutex_lock(&trace_types_lock); | |
1587 | if (current_trace && current_trace->print_max) | |
1588 | iter->tr = &max_tr; | |
1589 | else | |
1590 | iter->tr = inode->i_private; | |
1591 | iter->trace = current_trace; | |
1592 | iter->pos = -1; | |
1593 | ||
1594 | /* TODO stop tracer */ | |
1595 | *ret = seq_open(file, &tracer_seq_ops); | |
1596 | if (!*ret) { | |
1597 | struct seq_file *m = file->private_data; | |
1598 | m->private = iter; | |
1599 | ||
1600 | /* stop the trace while dumping */ | |
1601 | if (iter->tr->ctrl) | |
1602 | tracer_enabled = 0; | |
1603 | ||
1604 | if (iter->trace && iter->trace->open) | |
1605 | iter->trace->open(iter); | |
1606 | } else { | |
1607 | kfree(iter); | |
1608 | iter = NULL; | |
1609 | } | |
1610 | mutex_unlock(&trace_types_lock); | |
1611 | ||
1612 | out: | |
1613 | return iter; | |
1614 | } | |
1615 | ||
1616 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1617 | { | |
60a11774 SR |
1618 | if (tracing_disabled) |
1619 | return -ENODEV; | |
1620 | ||
bc0c38d1 SR |
1621 | filp->private_data = inode->i_private; |
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | int tracing_release(struct inode *inode, struct file *file) | |
1626 | { | |
1627 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1628 | struct trace_iterator *iter = m->private; | |
1629 | ||
1630 | mutex_lock(&trace_types_lock); | |
1631 | if (iter->trace && iter->trace->close) | |
1632 | iter->trace->close(iter); | |
1633 | ||
1634 | /* reenable tracing if it was previously enabled */ | |
1635 | if (iter->tr->ctrl) | |
1636 | tracer_enabled = 1; | |
1637 | mutex_unlock(&trace_types_lock); | |
1638 | ||
1639 | seq_release(inode, file); | |
1640 | kfree(iter); | |
1641 | return 0; | |
1642 | } | |
1643 | ||
1644 | static int tracing_open(struct inode *inode, struct file *file) | |
1645 | { | |
1646 | int ret; | |
1647 | ||
1648 | __tracing_open(inode, file, &ret); | |
1649 | ||
1650 | return ret; | |
1651 | } | |
1652 | ||
1653 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1654 | { | |
1655 | struct trace_iterator *iter; | |
1656 | int ret; | |
1657 | ||
1658 | iter = __tracing_open(inode, file, &ret); | |
1659 | ||
1660 | if (!ret) | |
1661 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1662 | ||
1663 | return ret; | |
1664 | } | |
1665 | ||
1666 | ||
e309b41d | 1667 | static void * |
bc0c38d1 SR |
1668 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1669 | { | |
1670 | struct tracer *t = m->private; | |
1671 | ||
1672 | (*pos)++; | |
1673 | ||
1674 | if (t) | |
1675 | t = t->next; | |
1676 | ||
1677 | m->private = t; | |
1678 | ||
1679 | return t; | |
1680 | } | |
1681 | ||
1682 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1683 | { | |
1684 | struct tracer *t = m->private; | |
1685 | loff_t l = 0; | |
1686 | ||
1687 | mutex_lock(&trace_types_lock); | |
1688 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
1689 | ; | |
1690 | ||
1691 | return t; | |
1692 | } | |
1693 | ||
1694 | static void t_stop(struct seq_file *m, void *p) | |
1695 | { | |
1696 | mutex_unlock(&trace_types_lock); | |
1697 | } | |
1698 | ||
1699 | static int t_show(struct seq_file *m, void *v) | |
1700 | { | |
1701 | struct tracer *t = v; | |
1702 | ||
1703 | if (!t) | |
1704 | return 0; | |
1705 | ||
1706 | seq_printf(m, "%s", t->name); | |
1707 | if (t->next) | |
1708 | seq_putc(m, ' '); | |
1709 | else | |
1710 | seq_putc(m, '\n'); | |
1711 | ||
1712 | return 0; | |
1713 | } | |
1714 | ||
1715 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
1716 | .start = t_start, |
1717 | .next = t_next, | |
1718 | .stop = t_stop, | |
1719 | .show = t_show, | |
bc0c38d1 SR |
1720 | }; |
1721 | ||
1722 | static int show_traces_open(struct inode *inode, struct file *file) | |
1723 | { | |
1724 | int ret; | |
1725 | ||
60a11774 SR |
1726 | if (tracing_disabled) |
1727 | return -ENODEV; | |
1728 | ||
bc0c38d1 SR |
1729 | ret = seq_open(file, &show_traces_seq_ops); |
1730 | if (!ret) { | |
1731 | struct seq_file *m = file->private_data; | |
1732 | m->private = trace_types; | |
1733 | } | |
1734 | ||
1735 | return ret; | |
1736 | } | |
1737 | ||
1738 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
1739 | .open = tracing_open, |
1740 | .read = seq_read, | |
1741 | .llseek = seq_lseek, | |
1742 | .release = tracing_release, | |
bc0c38d1 SR |
1743 | }; |
1744 | ||
1745 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
1746 | .open = tracing_lt_open, |
1747 | .read = seq_read, | |
1748 | .llseek = seq_lseek, | |
1749 | .release = tracing_release, | |
bc0c38d1 SR |
1750 | }; |
1751 | ||
1752 | static struct file_operations show_traces_fops = { | |
1753 | .open = show_traces_open, | |
1754 | .read = seq_read, | |
1755 | .release = seq_release, | |
1756 | }; | |
1757 | ||
1758 | static ssize_t | |
1759 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
1760 | size_t cnt, loff_t *ppos) | |
1761 | { | |
1762 | char *buf; | |
1763 | int r = 0; | |
1764 | int len = 0; | |
1765 | int i; | |
1766 | ||
1767 | /* calulate max size */ | |
1768 | for (i = 0; trace_options[i]; i++) { | |
1769 | len += strlen(trace_options[i]); | |
1770 | len += 3; /* "no" and space */ | |
1771 | } | |
1772 | ||
1773 | /* +2 for \n and \0 */ | |
1774 | buf = kmalloc(len + 2, GFP_KERNEL); | |
1775 | if (!buf) | |
1776 | return -ENOMEM; | |
1777 | ||
1778 | for (i = 0; trace_options[i]; i++) { | |
1779 | if (trace_flags & (1 << i)) | |
1780 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
1781 | else | |
1782 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
1783 | } | |
1784 | ||
1785 | r += sprintf(buf + r, "\n"); | |
1786 | WARN_ON(r >= len + 2); | |
1787 | ||
1788 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
1789 | buf, r); | |
1790 | ||
1791 | kfree(buf); | |
1792 | ||
1793 | return r; | |
1794 | } | |
1795 | ||
1796 | static ssize_t | |
1797 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
1798 | size_t cnt, loff_t *ppos) | |
1799 | { | |
1800 | char buf[64]; | |
1801 | char *cmp = buf; | |
1802 | int neg = 0; | |
1803 | int i; | |
1804 | ||
1805 | if (cnt > 63) | |
1806 | cnt = 63; | |
1807 | ||
1808 | if (copy_from_user(&buf, ubuf, cnt)) | |
1809 | return -EFAULT; | |
1810 | ||
1811 | buf[cnt] = 0; | |
1812 | ||
1813 | if (strncmp(buf, "no", 2) == 0) { | |
1814 | neg = 1; | |
1815 | cmp += 2; | |
1816 | } | |
1817 | ||
1818 | for (i = 0; trace_options[i]; i++) { | |
1819 | int len = strlen(trace_options[i]); | |
1820 | ||
1821 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
1822 | if (neg) | |
1823 | trace_flags &= ~(1 << i); | |
1824 | else | |
1825 | trace_flags |= (1 << i); | |
1826 | break; | |
1827 | } | |
1828 | } | |
1829 | ||
1830 | filp->f_pos += cnt; | |
1831 | ||
1832 | return cnt; | |
1833 | } | |
1834 | ||
1835 | static struct file_operations tracing_iter_fops = { | |
1836 | .open = tracing_open_generic, | |
1837 | .read = tracing_iter_ctrl_read, | |
1838 | .write = tracing_iter_ctrl_write, | |
1839 | }; | |
1840 | ||
7bd2f24c IM |
1841 | static const char readme_msg[] = |
1842 | "tracing mini-HOWTO:\n\n" | |
1843 | "# mkdir /debug\n" | |
1844 | "# mount -t debugfs nodev /debug\n\n" | |
1845 | "# cat /debug/tracing/available_tracers\n" | |
1846 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
1847 | "# cat /debug/tracing/current_tracer\n" | |
1848 | "none\n" | |
1849 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
1850 | "# cat /debug/tracing/current_tracer\n" | |
1851 | "sched_switch\n" | |
1852 | "# cat /debug/tracing/iter_ctrl\n" | |
1853 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
1854 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
1855 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
1856 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
1857 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
1858 | ; | |
1859 | ||
1860 | static ssize_t | |
1861 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
1862 | size_t cnt, loff_t *ppos) | |
1863 | { | |
1864 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
1865 | readme_msg, strlen(readme_msg)); | |
1866 | } | |
1867 | ||
1868 | static struct file_operations tracing_readme_fops = { | |
1869 | .open = tracing_open_generic, | |
1870 | .read = tracing_readme_read, | |
1871 | }; | |
1872 | ||
bc0c38d1 SR |
1873 | static ssize_t |
1874 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
1875 | size_t cnt, loff_t *ppos) | |
1876 | { | |
1877 | struct trace_array *tr = filp->private_data; | |
1878 | char buf[64]; | |
1879 | int r; | |
1880 | ||
1881 | r = sprintf(buf, "%ld\n", tr->ctrl); | |
4e3c3333 | 1882 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1883 | } |
1884 | ||
1885 | static ssize_t | |
1886 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
1887 | size_t cnt, loff_t *ppos) | |
1888 | { | |
1889 | struct trace_array *tr = filp->private_data; | |
1890 | long val; | |
1891 | char buf[64]; | |
1892 | ||
1893 | if (cnt > 63) | |
1894 | cnt = 63; | |
1895 | ||
1896 | if (copy_from_user(&buf, ubuf, cnt)) | |
1897 | return -EFAULT; | |
1898 | ||
1899 | buf[cnt] = 0; | |
1900 | ||
1901 | val = simple_strtoul(buf, NULL, 10); | |
1902 | ||
1903 | val = !!val; | |
1904 | ||
1905 | mutex_lock(&trace_types_lock); | |
1906 | if (tr->ctrl ^ val) { | |
1907 | if (val) | |
1908 | tracer_enabled = 1; | |
1909 | else | |
1910 | tracer_enabled = 0; | |
1911 | ||
1912 | tr->ctrl = val; | |
1913 | ||
1914 | if (current_trace && current_trace->ctrl_update) | |
1915 | current_trace->ctrl_update(tr); | |
1916 | } | |
1917 | mutex_unlock(&trace_types_lock); | |
1918 | ||
1919 | filp->f_pos += cnt; | |
1920 | ||
1921 | return cnt; | |
1922 | } | |
1923 | ||
1924 | static ssize_t | |
1925 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
1926 | size_t cnt, loff_t *ppos) | |
1927 | { | |
1928 | char buf[max_tracer_type_len+2]; | |
1929 | int r; | |
1930 | ||
1931 | mutex_lock(&trace_types_lock); | |
1932 | if (current_trace) | |
1933 | r = sprintf(buf, "%s\n", current_trace->name); | |
1934 | else | |
1935 | r = sprintf(buf, "\n"); | |
1936 | mutex_unlock(&trace_types_lock); | |
1937 | ||
4bf39a94 | 1938 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1939 | } |
1940 | ||
1941 | static ssize_t | |
1942 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
1943 | size_t cnt, loff_t *ppos) | |
1944 | { | |
1945 | struct trace_array *tr = &global_trace; | |
1946 | struct tracer *t; | |
1947 | char buf[max_tracer_type_len+1]; | |
1948 | int i; | |
1949 | ||
1950 | if (cnt > max_tracer_type_len) | |
1951 | cnt = max_tracer_type_len; | |
1952 | ||
1953 | if (copy_from_user(&buf, ubuf, cnt)) | |
1954 | return -EFAULT; | |
1955 | ||
1956 | buf[cnt] = 0; | |
1957 | ||
1958 | /* strip ending whitespace. */ | |
1959 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
1960 | buf[i] = 0; | |
1961 | ||
1962 | mutex_lock(&trace_types_lock); | |
1963 | for (t = trace_types; t; t = t->next) { | |
1964 | if (strcmp(t->name, buf) == 0) | |
1965 | break; | |
1966 | } | |
1967 | if (!t || t == current_trace) | |
1968 | goto out; | |
1969 | ||
1970 | if (current_trace && current_trace->reset) | |
1971 | current_trace->reset(tr); | |
1972 | ||
1973 | current_trace = t; | |
1974 | if (t->init) | |
1975 | t->init(tr); | |
1976 | ||
1977 | out: | |
1978 | mutex_unlock(&trace_types_lock); | |
1979 | ||
1980 | filp->f_pos += cnt; | |
1981 | ||
1982 | return cnt; | |
1983 | } | |
1984 | ||
1985 | static ssize_t | |
1986 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
1987 | size_t cnt, loff_t *ppos) | |
1988 | { | |
1989 | unsigned long *ptr = filp->private_data; | |
1990 | char buf[64]; | |
1991 | int r; | |
1992 | ||
1993 | r = snprintf(buf, 64, "%ld\n", | |
1994 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); | |
1995 | if (r > 64) | |
1996 | r = 64; | |
4bf39a94 | 1997 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1998 | } |
1999 | ||
2000 | static ssize_t | |
2001 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2002 | size_t cnt, loff_t *ppos) | |
2003 | { | |
2004 | long *ptr = filp->private_data; | |
2005 | long val; | |
2006 | char buf[64]; | |
2007 | ||
2008 | if (cnt > 63) | |
2009 | cnt = 63; | |
2010 | ||
2011 | if (copy_from_user(&buf, ubuf, cnt)) | |
2012 | return -EFAULT; | |
2013 | ||
2014 | buf[cnt] = 0; | |
2015 | ||
2016 | val = simple_strtoul(buf, NULL, 10); | |
2017 | ||
2018 | *ptr = val * 1000; | |
2019 | ||
2020 | return cnt; | |
2021 | } | |
2022 | ||
b3806b43 SR |
2023 | static atomic_t tracing_reader; |
2024 | ||
2025 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2026 | { | |
2027 | struct trace_iterator *iter; | |
2028 | ||
2029 | if (tracing_disabled) | |
2030 | return -ENODEV; | |
2031 | ||
2032 | /* We only allow for reader of the pipe */ | |
2033 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2034 | atomic_dec(&tracing_reader); | |
2035 | return -EBUSY; | |
2036 | } | |
2037 | ||
2038 | /* create a buffer to store the information to pass to userspace */ | |
2039 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2040 | if (!iter) | |
2041 | return -ENOMEM; | |
2042 | ||
2043 | iter->tr = &global_trace; | |
2044 | ||
2045 | filp->private_data = iter; | |
2046 | ||
2047 | return 0; | |
2048 | } | |
2049 | ||
2050 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2051 | { | |
2052 | struct trace_iterator *iter = file->private_data; | |
2053 | ||
2054 | kfree(iter); | |
2055 | atomic_dec(&tracing_reader); | |
2056 | ||
2057 | return 0; | |
2058 | } | |
2059 | ||
2a2cc8f7 SSP |
2060 | static unsigned int |
2061 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2062 | { | |
2063 | struct trace_iterator *iter = filp->private_data; | |
2064 | ||
2065 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2066 | /* | |
2067 | * Always select as readable when in blocking mode | |
2068 | */ | |
2069 | return POLLIN | POLLRDNORM; | |
2070 | } | |
2071 | else { | |
2072 | if (!trace_empty(iter)) | |
2073 | return POLLIN | POLLRDNORM; | |
2074 | poll_wait(filp, &trace_wait, poll_table); | |
2075 | if (!trace_empty(iter)) | |
2076 | return POLLIN | POLLRDNORM; | |
2077 | ||
2078 | return 0; | |
2079 | } | |
2080 | } | |
2081 | ||
b3806b43 SR |
2082 | /* |
2083 | * Consumer reader. | |
2084 | */ | |
2085 | static ssize_t | |
2086 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2087 | size_t cnt, loff_t *ppos) | |
2088 | { | |
2089 | struct trace_iterator *iter = filp->private_data; | |
2090 | struct trace_array_cpu *data; | |
2091 | static cpumask_t mask; | |
b3806b43 SR |
2092 | static int start; |
2093 | unsigned long flags; | |
25770467 | 2094 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2095 | int ftrace_save; |
25770467 | 2096 | #endif |
b3806b43 SR |
2097 | int read = 0; |
2098 | int cpu; | |
2099 | int len; | |
2100 | int ret; | |
2101 | ||
2102 | /* return any leftover data */ | |
2103 | if (iter->seq.len > start) { | |
2104 | len = iter->seq.len - start; | |
2105 | if (cnt > len) | |
2106 | cnt = len; | |
2107 | ret = copy_to_user(ubuf, iter->seq.buffer + start, cnt); | |
2108 | if (ret) | |
2109 | cnt = -EFAULT; | |
2110 | ||
2111 | start += len; | |
2112 | ||
2113 | return cnt; | |
2114 | } | |
2115 | ||
2116 | trace_seq_reset(&iter->seq); | |
2117 | start = 0; | |
2118 | ||
2119 | while (trace_empty(iter)) { | |
2a2cc8f7 SSP |
2120 | if (!(trace_flags & TRACE_ITER_BLOCK)) |
2121 | return -EWOULDBLOCK; | |
b3806b43 SR |
2122 | /* |
2123 | * This is a make-shift waitqueue. The reason we don't use | |
2124 | * an actual wait queue is because: | |
2125 | * 1) we only ever have one waiter | |
2126 | * 2) the tracing, traces all functions, we don't want | |
2127 | * the overhead of calling wake_up and friends | |
2128 | * (and tracing them too) | |
2129 | * Anyway, this is really very primitive wakeup. | |
2130 | */ | |
2131 | set_current_state(TASK_INTERRUPTIBLE); | |
2132 | iter->tr->waiter = current; | |
2133 | ||
2134 | /* sleep for one second, and try again. */ | |
2135 | schedule_timeout(HZ); | |
2136 | ||
2137 | iter->tr->waiter = NULL; | |
2138 | ||
2139 | if (signal_pending(current)) | |
2140 | return -EINTR; | |
2141 | ||
2142 | /* | |
2143 | * We block until we read something and tracing is disabled. | |
2144 | * We still block if tracing is disabled, but we have never | |
2145 | * read anything. This allows a user to cat this file, and | |
2146 | * then enable tracing. But after we have read something, | |
2147 | * we give an EOF when tracing is again disabled. | |
2148 | * | |
2149 | * iter->pos will be 0 if we haven't read anything. | |
2150 | */ | |
2151 | if (!tracer_enabled && iter->pos) | |
2152 | break; | |
2153 | ||
2154 | continue; | |
2155 | } | |
2156 | ||
2157 | /* stop when tracing is finished */ | |
2158 | if (trace_empty(iter)) | |
2159 | return 0; | |
2160 | ||
2161 | if (cnt >= PAGE_SIZE) | |
2162 | cnt = PAGE_SIZE - 1; | |
2163 | ||
2164 | memset(iter, 0, sizeof(*iter)); | |
2165 | iter->tr = &global_trace; | |
2166 | iter->pos = -1; | |
2167 | ||
2168 | /* | |
2169 | * We need to stop all tracing on all CPUS to read the | |
2170 | * the next buffer. This is a bit expensive, but is | |
2171 | * not done often. We fill all what we can read, | |
2172 | * and then release the locks again. | |
2173 | */ | |
2174 | ||
2175 | cpus_clear(mask); | |
2176 | local_irq_save(flags); | |
25770467 | 2177 | #ifdef CONFIG_FTRACE |
2e0f5761 IM |
2178 | ftrace_save = ftrace_enabled; |
2179 | ftrace_enabled = 0; | |
25770467 | 2180 | #endif |
2e0f5761 | 2181 | smp_wmb(); |
b3806b43 SR |
2182 | for_each_possible_cpu(cpu) { |
2183 | data = iter->tr->data[cpu]; | |
2184 | ||
2185 | if (!head_page(data) || !data->trace_idx) | |
2186 | continue; | |
2187 | ||
2188 | atomic_inc(&data->disabled); | |
b3806b43 SR |
2189 | cpu_set(cpu, mask); |
2190 | } | |
2191 | ||
2e0f5761 IM |
2192 | for_each_cpu_mask(cpu, mask) { |
2193 | data = iter->tr->data[cpu]; | |
2194 | spin_lock(&data->lock); | |
2195 | } | |
2196 | ||
088b1e42 SR |
2197 | while (find_next_entry_inc(iter) != NULL) { |
2198 | int len = iter->seq.len; | |
2199 | ||
f9896bf3 | 2200 | ret = print_trace_line(iter); |
088b1e42 SR |
2201 | if (!ret) { |
2202 | /* don't print partial lines */ | |
2203 | iter->seq.len = len; | |
b3806b43 | 2204 | break; |
088b1e42 | 2205 | } |
b3806b43 SR |
2206 | |
2207 | trace_consume(iter); | |
2208 | ||
2209 | if (iter->seq.len >= cnt) | |
2210 | break; | |
b3806b43 SR |
2211 | } |
2212 | ||
d4c5a2f5 | 2213 | for_each_cpu_mask(cpu, mask) { |
b3806b43 | 2214 | data = iter->tr->data[cpu]; |
b3806b43 | 2215 | spin_unlock(&data->lock); |
2e0f5761 IM |
2216 | } |
2217 | ||
2218 | for_each_cpu_mask(cpu, mask) { | |
2219 | data = iter->tr->data[cpu]; | |
b3806b43 SR |
2220 | atomic_dec(&data->disabled); |
2221 | } | |
25770467 | 2222 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2223 | ftrace_enabled = ftrace_save; |
25770467 | 2224 | #endif |
b3806b43 SR |
2225 | local_irq_restore(flags); |
2226 | ||
2227 | /* Now copy what we have to the user */ | |
2228 | read = iter->seq.len; | |
2229 | if (read > cnt) | |
2230 | read = cnt; | |
2231 | ||
2232 | ret = copy_to_user(ubuf, iter->seq.buffer, read); | |
2233 | ||
2234 | if (read < iter->seq.len) | |
2235 | start = read; | |
2236 | else | |
2237 | trace_seq_reset(&iter->seq); | |
2238 | ||
2239 | if (ret) | |
2240 | read = -EFAULT; | |
2241 | ||
2242 | return read; | |
2243 | } | |
2244 | ||
bc0c38d1 | 2245 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2246 | .open = tracing_open_generic, |
2247 | .read = tracing_max_lat_read, | |
2248 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2249 | }; |
2250 | ||
2251 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2252 | .open = tracing_open_generic, |
2253 | .read = tracing_ctrl_read, | |
2254 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2255 | }; |
2256 | ||
2257 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2258 | .open = tracing_open_generic, |
2259 | .read = tracing_set_trace_read, | |
2260 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2261 | }; |
2262 | ||
b3806b43 | 2263 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2264 | .open = tracing_open_pipe, |
2a2cc8f7 | 2265 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2266 | .read = tracing_read_pipe, |
2267 | .release = tracing_release_pipe, | |
b3806b43 SR |
2268 | }; |
2269 | ||
bc0c38d1 SR |
2270 | #ifdef CONFIG_DYNAMIC_FTRACE |
2271 | ||
2272 | static ssize_t | |
2273 | tracing_read_long(struct file *filp, char __user *ubuf, | |
2274 | size_t cnt, loff_t *ppos) | |
2275 | { | |
2276 | unsigned long *p = filp->private_data; | |
2277 | char buf[64]; | |
2278 | int r; | |
2279 | ||
2280 | r = sprintf(buf, "%ld\n", *p); | |
4bf39a94 IM |
2281 | |
2282 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
bc0c38d1 SR |
2283 | } |
2284 | ||
2285 | static struct file_operations tracing_read_long_fops = { | |
4bf39a94 IM |
2286 | .open = tracing_open_generic, |
2287 | .read = tracing_read_long, | |
bc0c38d1 SR |
2288 | }; |
2289 | #endif | |
2290 | ||
2291 | static struct dentry *d_tracer; | |
2292 | ||
2293 | struct dentry *tracing_init_dentry(void) | |
2294 | { | |
2295 | static int once; | |
2296 | ||
2297 | if (d_tracer) | |
2298 | return d_tracer; | |
2299 | ||
2300 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2301 | ||
2302 | if (!d_tracer && !once) { | |
2303 | once = 1; | |
2304 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2305 | return NULL; | |
2306 | } | |
2307 | ||
2308 | return d_tracer; | |
2309 | } | |
2310 | ||
60a11774 SR |
2311 | #ifdef CONFIG_FTRACE_SELFTEST |
2312 | /* Let selftest have access to static functions in this file */ | |
2313 | #include "trace_selftest.c" | |
2314 | #endif | |
2315 | ||
bc0c38d1 SR |
2316 | static __init void tracer_init_debugfs(void) |
2317 | { | |
2318 | struct dentry *d_tracer; | |
2319 | struct dentry *entry; | |
2320 | ||
2321 | d_tracer = tracing_init_dentry(); | |
2322 | ||
2323 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2324 | &global_trace, &tracing_ctrl_fops); | |
2325 | if (!entry) | |
2326 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2327 | ||
2328 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
2329 | NULL, &tracing_iter_fops); | |
2330 | if (!entry) | |
2331 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
2332 | ||
2333 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, | |
2334 | &global_trace, &tracing_lt_fops); | |
2335 | if (!entry) | |
2336 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
2337 | ||
2338 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
2339 | &global_trace, &tracing_fops); | |
2340 | if (!entry) | |
2341 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2342 | ||
2343 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2344 | &global_trace, &show_traces_fops); | |
2345 | if (!entry) | |
2346 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2347 | ||
2348 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2349 | &global_trace, &set_tracer_fops); | |
2350 | if (!entry) | |
2351 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2352 | ||
2353 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2354 | &tracing_max_latency, | |
2355 | &tracing_max_lat_fops); | |
2356 | if (!entry) | |
2357 | pr_warning("Could not create debugfs " | |
2358 | "'tracing_max_latency' entry\n"); | |
2359 | ||
2360 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2361 | &tracing_thresh, &tracing_max_lat_fops); | |
2362 | if (!entry) | |
2363 | pr_warning("Could not create debugfs " | |
2364 | "'tracing_threash' entry\n"); | |
7bd2f24c IM |
2365 | entry = debugfs_create_file("README", 0644, d_tracer, |
2366 | NULL, &tracing_readme_fops); | |
2367 | if (!entry) | |
2368 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2369 | ||
b3806b43 SR |
2370 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2371 | NULL, &tracing_pipe_fops); | |
2372 | if (!entry) | |
2373 | pr_warning("Could not create debugfs " | |
2374 | "'tracing_threash' entry\n"); | |
bc0c38d1 SR |
2375 | |
2376 | #ifdef CONFIG_DYNAMIC_FTRACE | |
2377 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2378 | &ftrace_update_tot_cnt, | |
2379 | &tracing_read_long_fops); | |
2380 | if (!entry) | |
2381 | pr_warning("Could not create debugfs " | |
2382 | "'dyn_ftrace_total_info' entry\n"); | |
2383 | #endif | |
2384 | } | |
2385 | ||
2386 | /* dummy trace to disable tracing */ | |
2387 | static struct tracer no_tracer __read_mostly = | |
2388 | { | |
4bf39a94 | 2389 | .name = "none", |
bc0c38d1 SR |
2390 | }; |
2391 | ||
4c11d7ae | 2392 | static int trace_alloc_page(void) |
bc0c38d1 | 2393 | { |
4c11d7ae | 2394 | struct trace_array_cpu *data; |
4c11d7ae SR |
2395 | struct page *page, *tmp; |
2396 | LIST_HEAD(pages); | |
c7aafc54 | 2397 | void *array; |
4c11d7ae SR |
2398 | int i; |
2399 | ||
2400 | /* first allocate a page for each CPU */ | |
2401 | for_each_possible_cpu(i) { | |
2402 | array = (void *)__get_free_page(GFP_KERNEL); | |
2403 | if (array == NULL) { | |
2404 | printk(KERN_ERR "tracer: failed to allocate page" | |
2405 | "for trace buffer!\n"); | |
2406 | goto free_pages; | |
2407 | } | |
2408 | ||
2409 | page = virt_to_page(array); | |
2410 | list_add(&page->lru, &pages); | |
2411 | ||
2412 | /* Only allocate if we are actually using the max trace */ | |
2413 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2414 | array = (void *)__get_free_page(GFP_KERNEL); | |
2415 | if (array == NULL) { | |
2416 | printk(KERN_ERR "tracer: failed to allocate page" | |
2417 | "for trace buffer!\n"); | |
2418 | goto free_pages; | |
2419 | } | |
2420 | page = virt_to_page(array); | |
2421 | list_add(&page->lru, &pages); | |
2422 | #endif | |
2423 | } | |
2424 | ||
2425 | /* Now that we successfully allocate a page per CPU, add them */ | |
2426 | for_each_possible_cpu(i) { | |
2427 | data = global_trace.data[i]; | |
b3806b43 | 2428 | spin_lock_init(&data->lock); |
d4c5a2f5 | 2429 | lockdep_set_class(&data->lock, &data->lock_key); |
4c11d7ae | 2430 | page = list_entry(pages.next, struct page, lru); |
c7aafc54 | 2431 | list_del_init(&page->lru); |
4c11d7ae SR |
2432 | list_add_tail(&page->lru, &data->trace_pages); |
2433 | ClearPageLRU(page); | |
2434 | ||
2435 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2436 | data = max_tr.data[i]; | |
b3806b43 | 2437 | spin_lock_init(&data->lock); |
d4c5a2f5 | 2438 | lockdep_set_class(&data->lock, &data->lock_key); |
4c11d7ae | 2439 | page = list_entry(pages.next, struct page, lru); |
c7aafc54 | 2440 | list_del_init(&page->lru); |
4c11d7ae SR |
2441 | list_add_tail(&page->lru, &data->trace_pages); |
2442 | SetPageLRU(page); | |
2443 | #endif | |
2444 | } | |
2445 | global_trace.entries += ENTRIES_PER_PAGE; | |
2446 | ||
2447 | return 0; | |
2448 | ||
2449 | free_pages: | |
2450 | list_for_each_entry_safe(page, tmp, &pages, lru) { | |
c7aafc54 | 2451 | list_del_init(&page->lru); |
4c11d7ae SR |
2452 | __free_page(page); |
2453 | } | |
2454 | return -ENOMEM; | |
bc0c38d1 SR |
2455 | } |
2456 | ||
2457 | __init static int tracer_alloc_buffers(void) | |
2458 | { | |
4c11d7ae SR |
2459 | struct trace_array_cpu *data; |
2460 | void *array; | |
2461 | struct page *page; | |
2462 | int pages = 0; | |
60a11774 | 2463 | int ret = -ENOMEM; |
bc0c38d1 SR |
2464 | int i; |
2465 | ||
26994ead SR |
2466 | global_trace.ctrl = tracer_enabled; |
2467 | ||
4c11d7ae | 2468 | /* Allocate the first page for all buffers */ |
bc0c38d1 | 2469 | for_each_possible_cpu(i) { |
4c11d7ae | 2470 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 SR |
2471 | max_tr.data[i] = &per_cpu(max_data, i); |
2472 | ||
4c11d7ae | 2473 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2474 | if (array == NULL) { |
4c11d7ae SR |
2475 | printk(KERN_ERR "tracer: failed to allocate page" |
2476 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2477 | goto free_buffers; |
2478 | } | |
4c11d7ae SR |
2479 | |
2480 | /* set the array to the list */ | |
2481 | INIT_LIST_HEAD(&data->trace_pages); | |
2482 | page = virt_to_page(array); | |
2483 | list_add(&page->lru, &data->trace_pages); | |
2484 | /* use the LRU flag to differentiate the two buffers */ | |
2485 | ClearPageLRU(page); | |
bc0c38d1 SR |
2486 | |
2487 | /* Only allocate if we are actually using the max trace */ | |
2488 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4c11d7ae | 2489 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2490 | if (array == NULL) { |
4c11d7ae SR |
2491 | printk(KERN_ERR "tracer: failed to allocate page" |
2492 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2493 | goto free_buffers; |
2494 | } | |
4c11d7ae SR |
2495 | |
2496 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); | |
2497 | page = virt_to_page(array); | |
2498 | list_add(&page->lru, &max_tr.data[i]->trace_pages); | |
2499 | SetPageLRU(page); | |
bc0c38d1 SR |
2500 | #endif |
2501 | } | |
2502 | ||
2503 | /* | |
2504 | * Since we allocate by orders of pages, we may be able to | |
2505 | * round up a bit. | |
2506 | */ | |
4c11d7ae | 2507 | global_trace.entries = ENTRIES_PER_PAGE; |
4c11d7ae SR |
2508 | pages++; |
2509 | ||
2510 | while (global_trace.entries < trace_nr_entries) { | |
2511 | if (trace_alloc_page()) | |
2512 | break; | |
2513 | pages++; | |
2514 | } | |
89b2f978 | 2515 | max_tr.entries = global_trace.entries; |
bc0c38d1 | 2516 | |
4c11d7ae SR |
2517 | pr_info("tracer: %d pages allocated for %ld", |
2518 | pages, trace_nr_entries); | |
bc0c38d1 SR |
2519 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
2520 | pr_info(" actual entries %ld\n", global_trace.entries); | |
2521 | ||
2522 | tracer_init_debugfs(); | |
2523 | ||
2524 | trace_init_cmdlines(); | |
2525 | ||
2526 | register_tracer(&no_tracer); | |
2527 | current_trace = &no_tracer; | |
2528 | ||
60a11774 SR |
2529 | /* All seems OK, enable tracing */ |
2530 | tracing_disabled = 0; | |
2531 | ||
bc0c38d1 SR |
2532 | return 0; |
2533 | ||
2534 | free_buffers: | |
2535 | for (i-- ; i >= 0; i--) { | |
4c11d7ae | 2536 | struct page *page, *tmp; |
bc0c38d1 SR |
2537 | struct trace_array_cpu *data = global_trace.data[i]; |
2538 | ||
c7aafc54 | 2539 | if (data) { |
4c11d7ae SR |
2540 | list_for_each_entry_safe(page, tmp, |
2541 | &data->trace_pages, lru) { | |
c7aafc54 | 2542 | list_del_init(&page->lru); |
4c11d7ae SR |
2543 | __free_page(page); |
2544 | } | |
bc0c38d1 SR |
2545 | } |
2546 | ||
2547 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2548 | data = max_tr.data[i]; | |
c7aafc54 | 2549 | if (data) { |
4c11d7ae SR |
2550 | list_for_each_entry_safe(page, tmp, |
2551 | &data->trace_pages, lru) { | |
c7aafc54 | 2552 | list_del_init(&page->lru); |
4c11d7ae SR |
2553 | __free_page(page); |
2554 | } | |
bc0c38d1 SR |
2555 | } |
2556 | #endif | |
2557 | } | |
60a11774 | 2558 | return ret; |
bc0c38d1 | 2559 | } |
60a11774 | 2560 | fs_initcall(tracer_alloc_buffers); |